Entries |
Document | Title | Date |
20080211415 | RESISTIVE BYPASS FOR SERIES LIGHTING CIRCUIT - A resistor bypass circuit for a series lighting circuit includes a plurality of serially connected light sources and a bypass resistor being connected in parallel with at least one of the respective light sources, each respective light source being low wattage and being capable operating on a one hundred percent duty cycle as desired. | 09-04-2008 |
20080218093 | Structure of AC light-emitting diode dies - A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage. | 09-11-2008 |
20080231204 | Light emitting diode assembly replacement for fluorescent lamp - A method and apparatus for replacing a fluorescent lighting system with a light emitting diode (LED) system. By connecting the LEDs in accordance with the described embodiment, the fluorescent lamp driving circuit can be reused without modification. The current rating of the LEDs must be equal to or less than the current output of the fluorescent lamp driving circuit. The LED replacement lamp may consist of as few as two LEDs but multiple LEDs may be used as long as the power consumed by the LEDs does not exceed the power rating of the fluorescent lamp driving circuit. | 09-25-2008 |
20090045753 | LED lamp string - A LED lamp string, especially indicating a type of LED lamp string, which plug-fitting directly into AC power socket, and a controllable blinking or non-blinking structure which combining two or more than two groups of dual crystal current controllers in the main electrical wire circuitry to achieve results of bridge rectifier to make the current flowing through the LED lamp string become the state of DC current and thus achieve the non-blinking effect. | 02-19-2009 |
20090153066 | Light emitting diode circuit having even current - A light emitting diode (LED) circuit having even current has multiple LED strings, a current equalizing integrated circuit (IC) and a voltage compensation module. The LED strings are connected to an external power source, and each LED string has a power terminal and a driving terminal. The current equalizing IC has multiple driving pins connected respectively to the driving terminals of the LED strings. The voltage compensation module is connected between the LED strings and the external power source and has a threshold voltage value and multiple input terminals. The input terminals are connected respectively to the driving pins of the current equalizing IC to allow the voltage compensation module rise and send the voltage obtained from the external power source to the LED strings when the voltage compensation module determines any voltage on the driving pins of the current equalizing IC is lower than the threshold voltage value. | 06-18-2009 |
20090167198 | Light string having shunt circuitry arranged on husk of light bulb assembly - Provided is a light string with a light bulb having additional shunt circuitry. The light string is comprised by a plurality of light bulb units electrically interconnected by conductive wires. Each light bulb unit includes a socket assembly in which a husk along with a light bulb is electrically assembled, each light bulb arranged with switching diode or resistor so as to configure a shunt circuitry. Accordingly, the current flows through the additional shunt circuitry configured by the switching diode or resistor arranged on the husk when the light bulb is fallen, broken or the tungsten filament and shunt circuitry within the light bulb is broken, such that the remaining light bulbs can still functionally work. | 07-02-2009 |
20090195168 | METHOD AND SYSTEM FOR DIMMING AC-POWERED LIGHT EMITTING DIODE (LED) LIGHTING SYSTEMS USING CONVENTIONAL INCANDESCENT DIMMERS - A dimming control circuit for dimming light emitting diodes receives an AC input voltage signal from a dimming circuit. The control circuit includes a power stage and a current control loop coupled to the power stage. An AC detector is operable to detect an instantaneous value of the AC input voltage signal and to generate a signal indicating whether the AC input voltage signal is present or absent. A current control circuit is operable responsive to the signal to adjust the operation of the current control loop and to control current through the light emitting diodes to achieve the desired dimming, and to prevent inrush current on the AC input voltage signal. | 08-06-2009 |
20090230874 | LED DRIVER WITH SEGMENTED DYNAMIC HEADROOM CONTROL - Techniques for dynamic headroom control in a light emitting diode (LED) system are disclosed. An output voltage is provided to drive a plurality of LED strings. A feedback controller monitors the tail voltages of the LED strings to identify the minimum tail voltage and adjusts the output voltage based on the lowest tail voltage. The LED strings grouped into subsets and the feedback controller is segmented such that, for a certain duration, a minimum tail voltage is determined for each subset. The minimum tail voltages of the subsets are used to determine the overall minimum tail voltage of the plurality of LED strings for the certain duration so as to control the output voltage in the following duration. The segments of the feedback controller can be implemented in separate integrated circuit (IC) packages, thereby facilitating adaptation to different numbers of LED strings by integrating the corresponding number of IC packages. | 09-17-2009 |
20090243501 | COMBINED SERIAL/PARALLEL LIGHT CONFIGURATION - Exemplary embodiments connect lights in both series and parallel. The lights can be LEDs, organic light emitting diodes (OLED), field emitting display (FED), light emitting polymer (LEP), or organic electro-luminescence (OEL). Exemplary embodiments also mount the lights on a printed circuit board (PCB) which has low thermal resistivity between the surface containing the lights and the opposite surface. The opposite surface may be metallic, and air may be forced over this surface in order to cool the assembly. | 10-01-2009 |
20090261743 | LIGHT EMITTING DIODE DRIVING MODULE - An LED driving module suitable to drive a plurality of LED strings in parallel connection is disclosed. The LED driving module includes a voltage converting apparatus, a conduction voltage detecting apparatus, a reference voltage generating apparatus and a current-adjusting apparatus. The voltage converting apparatus produces a driving voltage according to a conduction voltage. The conduction voltage detecting apparatus detects the conducting states of the LED strings for producing a conduction voltage and an enabling signal. The reference voltage generating apparatus generates a first reference voltage according to the enabling signal. The current-adjusting apparatus produces a plurality of driving currents according to the first reference voltage, and the driving currents flow through the LED strings. | 10-22-2009 |
20100013396 | LED CONTROL SYSTEM USING MODULATED SIGNAL - An LED control system using a modulated signal includes a computer, a data storage unit, an AC power, a power conversion circuit, a control circuit, and an LED lamp string. The AC power is converted into a DC power by the power conversion circuit to supply a DC voltage to the control circuit and the LED lamp string. A computer control data is sent to the control circuit through the data storage unit by a user using the computer. The computer control data is modulated to a modulated signal by the control circuit. The modulated signal is sent to the LED lamp string with the same transmission line sending the DC voltage. The light of the LED lamp string is changed according to the modulated signal. The cost is reduced because the DC voltage and the modulated signal are sent in the same transmission line. | 01-21-2010 |
20100072905 | LIGHT EMITTING DEVICE FOR AC OPERATION - An AC light emitting device is disclosed. The AC light emitting device includes at least four substrates. Serial arrays each of which has a plurality of light emitting cells connected in series are positioned on the substrates, respectively. Meanwhile, first connector means electrically connect the serial arrays formed on respective different substrates. At least two array groups each of which has at least two of the serial arrays connected in series by the first connector means are formed. The at least two array groups are connected in reverse parallel to operate. Accordingly, there is provided an AC light emitting device capable of being driven under an AC power source. | 03-25-2010 |
20100102735 | LED LIGHT STRING WITH ZENER DIODES OR RESISTORS AS SHUNTS - A light string in one embodiment includes a plurality of lamps connected in series, each lamp having a shunt Zener diode; and a rectifier. An anode of the Zener diode of each lamp is connected to a cathode of the LED thereof, the cathode of the Zener diode of each lamp is connected to the anode of the LED thereof, the cathode of the Zener diode of the lamp proximate the rectifier is connected to a positive terminal of an output of the rectifier, and the anode of the Zener diode of the lamp distal the rectifier is connected to a negative terminal of the output of the rectifier. The Zener diodes are replaced by resistors in another embodiment. Hence, a burned out LED of one lamp will not adversely affect a normal operation of the light string. | 04-29-2010 |
20100102736 | COLOR-VARIABLE LED LIGHT, PARTICULARLY FOR LIGHTING THE INTERIOR OF VEHICLES - The invention relates to an LED light, particularly a reading or seat lamp for vehicles such as travel coaches or airplanes, said light being equipped with a housing ( | 04-29-2010 |
20100194299 | METHOD OF DRIVING A LIGHT SOURCE, LIGHT SOURCE APPARATUS FOR PERFORMING THE METHOD, AND DISPLAY APPARATUS HAVING THE LIGHT SOURCE APPARATUS - A method of driving a light source, a light source apparatus for performing the method, and a display apparatus having the light source apparatus are disclosed in accordance with one or more embodiments. In the method, a plurality of light source strings connected in parallel is driven by applying a driving voltage to a first terminal of the light source strings. A peak current due to a voltage deviation of each of the light source strings is switch-controlled to uniform an average current of the light source strings. Thus, a peak current flowing through light source strings in accordance with a voltage deviation of the light source strings is switch-controlled, so that an average current of the light source strings may be uniformly maintained. Therefore, a voltage deviation is not consumed as power, so that damage to circuit elements due to heat may be prevented. | 08-05-2010 |
20100237789 | LIGHT-EMITTING DIODE (LED) LAMP STRING DEVICE WITH BATTERY BOX - A lighting-emitting diode (LED) lamp string device with a battery box is provided. The LED lamp string device includes a power supply system and a lamp string light emission system connected together. The lamp string light emission system includes an LED lamp string that is composed of a plurality of LED lamps and electrical wires that electrically connect the LED lamps. The power supply system includes batteries and a light controller that are connected to the LED lamp string through the electrical wires and further includes a battery box, in which the light controller and the batteries are received. | 09-23-2010 |
20100244713 | ILLUMINATION APPARATUS USING LIGHT EMITTING DIODE - An illumination apparatus using a light emitting diode is directly driven by an alternating current (AC) power source, displays colors and simultaneously controls a color's brightness level. The illumination apparatus includes a power terminal unit to which an AC power source is applied; a variable current unit connected to one end of the power terminal unit, dividing current provided from the power terminal unit into a plurality of current levels, and including first, second and third variable current units controlling the plurality of divided current levels, respectively; and a light emitting unit including red, green, and blue light emitting units, respectively disposed between the first variable current unit and the other end of the power terminal unit, between the second variable current unit and the other end of the power terminal unit, and between the third variable current unit and the other end of the power terminal unit. | 09-30-2010 |
20100277084 | LIGHT EMITTING DEVICE FOR AC POWER OPERATION - Disclosed is an improved light-emitting device for an AC power operation. A conventional light emitting device employs an AC light-emitting diode having arrays of light emitting cells connected in reverse parallel. The arrays in the prior art alternately repeat on/off in response to a phase change of an AC power source, resulting in short light emission time during a ½ cycle and the occurrence of a flicker effect. An AC light-emitting device according to the present invention employs a variety of means by which light emission time is prolonged during a ½ cycle in response to a phase change of an AC power source and a flicker effect can be reduced. For example, the means may be switching blocks respectively connected to nodes between the light emitting cells, switching blocks connected to a plurality of arrays, or a delay phosphor. Further, there is provided an AC light-emitting device, wherein a plurality of arrays having the different numbers of light emitting cells are employed to increase light emission time and to reduce a flicker effect. | 11-04-2010 |
20100283397 | METHOD AND SYSTEM FOR HIGH EFFICIENCY, FAST TRANSIENT MULTI-CHANNEL LED DRIVER - System and method for a light emitting diode (LED) driver are disclosed. To supply an LED bus voltage to a large array of LEDs organized in multiple channels where one or more LEDs are connected in series in each channel, an LED driver includes a power converter, a feedback generation circuit, and a phase-division based controller. The power converter is configured for providing the LED bus voltage to the multiple LED channels based on a voltage control signal. The feedback generation circuit is configured for generating a feedback signal based on the LED bus voltage supplied to the multiple LED channels. The phase-division based controller is configured for generating the voltage control signal based on the feedback signal and information from the multiple LED channels. The phase-division based controller divides each pulse width modulation (PWM) of each channel into a tracking phase and a pre-charging phase so that the LED bus voltage supplied to the multiple channels changes between the tracking phase and the pre-charging phase. | 11-11-2010 |
20100289416 | Lighting devices - Lighting devices capable of being powered by both AC and DC power sources without requiring AC power source to the DC power source conversion are provided, in which a lighting module comprises a plurality of micro-diodes formed on a substrate and a conductive wire pattern connecting to the micro-diodes, wherein the conductive wire pattern has at least three voltage feed points. A selection unit is coupled to a power source and selects at least two of the voltage feed points, such that a portion of the micro-diodes and the power source form at least one loop thereby turning on the micro-diodes in the loop. | 11-18-2010 |
20100315014 | LED light string - An electrical circuit for use as a string of lights in one embodiment includes a full-wave rectifier for converting an electrical source of AC into DC; and a load comprising a plurality of lamps connected in series, each of the lamps comprising an LED, a loading member in parallel with the LED, and a conductor interconnecting the LED and the loading member. The loading member is either a bidirectional Zener diode or a resistor element. | 12-16-2010 |
20110062875 | RESISTIVE BYPASS FOR SERIES LIGHTING CIRCUIT - A resistor bypass circuit for a series lighting circuit includes a plurality of serially connected light sources and a bypass resistor being connected in parallel with at least one of the respective light sources, each respective light source being low wattage and being capable operating on a one hundred percent duty cycle as desired. | 03-17-2011 |
20110089843 | DC/DC CONVERTER - A DC/DC converter converts an input DC voltage into an output DC voltage. The DC/DC converter includes an input capacitor, an inductor, an electronic switch, a diode, an output capacitor and a control unit, wherein the control unit controls the first electronic switch as a function of the signals fed to the control unit. The input capacitor is connected between the input voltage and ground or zero point, and the inductor is connected between the input capacitor and the electronic switch. A second electronic switch, which the control unit can drive by means of a switching signal, is disposed between the load and the ground or zero point, and a second diode embodies a connection between the output of the load and the input capacitor. The control unit is fed the value of the input voltage. | 04-21-2011 |
20110127920 | Protection circuit for alternating current light emitting diode - The present invention relates to a protection circuit for an alternating current light emitting diode which mainly comprises light emitting diodes placed in series and parallel with loads in a light emitting diode lamp device. When one of the light emitting diodes has been damaged, the current flows through the load in parallel with the light emitting diode and flows to the next light emitting diode. Only the damaged light emitting diode is off to keep from causing an open circuit in the overall circuitry and to prevent the overall lamp device from turning off and not emitting light. In addition to the device being easier to use, finding the damaged light emitting diode for replacement is faster, easier and more convenient when repairing the damaged light emitting diode, thereby greatly enhancing the usefulness and practicability of the protection circuit for an alternating current light emitting diode. | 06-02-2011 |
20110127921 | Light-emitting Diode (LED) Current Balance Circuit - A light-emitting diode (LED) current balance circuit includes a reference current generator, a current mirror and a voltage compensation circuit. The reference current generator provides a reference current robust against disturbance in a supply voltage applied to the reference current generator. The current mirror generates, according to the reference current, sink currents to bias lightbars and employs a structure to reduce the influence of unmatched transistors on the sink currents so as to stabilize and clamp currents through the lightbar. The voltage compensation circuit detects the voltages across the lightbars to compensate the lightbars having various forward voltages so as to ensure the turn-on of all lightbars and effectively balance the currents through the lightbars. Therefore, the invention employs simpler circuit architecture and not need a specific-purpose LED controller so as to be cheaper and more competitive. | 06-02-2011 |
20110127922 | llumination device comprising multiple LEDs - A light generating device ( | 06-02-2011 |
20110133658 | Illumination Device Comprising Multiple LEDs - A light generating device ( | 06-09-2011 |
20110140617 | LIGHT EMITTING DEVICE - It is an object of the present invention to provide a light emitting device which is less affected by a malfunction caused in a light emitting element. It is another object of the invention to provide a light emitting device in which light emitting elements are connected in series. As to a light emitting device of the invention, groups of circuits each having a light emitting element and a limiter are connected in parallel. Here, a light emitting element and a limiter are connected in series. The number of the circuits may be at least two or more. Further, each circuit group includes at least one light emitting element. | 06-16-2011 |
20110148314 | Serial-Type Light-Emitting Diode (LED) Device - A serial-type LED device includes p light source units and a dimming circuit. Each light source unit includes a first and a second terminals, m light strings and m current balance units. Each light string includes LEDs coupled in series to have a first terminal coupled to the first terminal of a corresponding light source unit and a second terminal coupled to the second terminal of the corresponding light source unit through a corresponding current balance unit. The first terminal of the first light source unit is coupled to a second DC voltage, and the second terminal of the i-th light source unit is coupled to the first terminal of the (i+1)-th light source unit, where m and p are integers greater than or equal to 2 and i is any integer from 1 to (p−1). The dimming circuit coupled to the second terminal of the p-th light source unit controls the second DC voltage according to a current outputted from the p-th light source unit. | 06-23-2011 |
20110163682 | METHOD AND SYSTEM FOR DRIVING LIGHT EMITTING ELEMENTS - A system topology and circuit design for efficiently and stably driving currents through strings of solid state light emitting elements by providing current sources that are controlled by a stable voltage reference. | 07-07-2011 |
20110163683 | Solid State Lamp Using Light Emitting Strips - In one embodiment, an LED lamp has a generally bulb shape. The LEDs are low power types and are encapsulated in thin, narrow, flexible strips. The LEDs are connected in series in the strips to drop a desired voltage. The strips are affixed to the outer surface of a bulb form to provide structure to the lamp. The strips are connected in parallel to a power supply, which may be housed in the lamp. Since many low power LEDs are used and are spread out over a large surface area, there is no need for a large metal heat sink. Further, the light emission is similar to that of an incandescent bulb. In other embodiment, there is no bulb form and the strips are bendable to have a variety of shapes. In another embodiment, a light sheet is bent to provide 360 degrees of light emission. Many other embodiments are described. | 07-07-2011 |
20110181195 | DECORATIVE LIGHTING DEVICE - A decorative lighting device includes at least one movable decorative element and a plurality of string light sets. A power supply drives each string light set to form a current loop respectively. Each string light set respectively has a plurality of lamp holders connected to each other in series. The lamp holder is respectively selectively electrically connected to a light-emitting element or the movable decorative element, so that the lamp holder respectively supplies a power to the light-emitting element or the movable decorative element. | 07-28-2011 |
20110204801 | COMPUTER CONTROLLED POWER SUPPLY ASSEMBLY FOR A LED ARRAY - The present invention consists of a power supply and LED circuit arrangement for powering LED arrays such that single or multiple LED failures will have minimal affect on the utility of the LED array. The power supply consists of an analog or microcontroller-based feedback module with single/multiple feedback signals in series with a synchronous buck-boost converter followed by an optional filter and a LED array. The assembly utilizes the feedback signal, to modulate various parameters of the LED array, such as the output intensity, LED junction temperature, and chromaticity. The power supply can drive different circuit arrangements of LEDs including series, parallel, and combinations thereof. Typical feedback signals include LED current, temperature, and ambient luminance and contrast. | 08-25-2011 |
20110210678 | Spectral Shift Control for Dimmable AC LED Lighting - Apparatus and associated methods involve operation of an LED light engine in which a relative intensities of selected wavelengths shift as a function of electrical excitation. In an illustrative example, current may be selectively and automatically diverted substantially away from at least one of a number of LEDs arranged in a series circuit until the current or its associated periodic excitation voltage reaches a predetermined threshold level. The diversion current may be smoothly reduced in transition as the excitation current or voltage rises substantially above the predetermined threshold level. A color temperature of the light output may be substantially changed as a predetermined function of the excitation voltage. For example, some embodiments may substantially increase or decrease a color temperature output by a solid state light engine in response to dimming the AC voltage excitation (e.g., by phase-cutting or amplitude modulation). | 09-01-2011 |
20110210679 | Device and method for activating LED strings - A device for activating at least two LED strings includes a source of electrical power, a switching controller and at least two LED strings having one or more LED(s). The switching controller in this case includes means for generating an essentially constant current, and the LED strings cooperate with the switching controller in such a way that at least one of the LED strings is supplied with current at least part of the time using the essentially constant current generated by the means. | 09-01-2011 |
20110227493 | LIGHT EMITTING DIODE DRIVER SYSTEMS AND ASSOCIATED METHODS OF CONTROL - Light emitting diode (LED) dimming and driver systems and associated methods of control are disclosed herein. In one embodiment, a system comprises a PFC stage and an LED driver stage. The LED driver stage comprises an isolated converter and a controller responsive to a dimming signal to dim LED strings for backlight. The controller also regulates an output current of the isolated converter. | 09-22-2011 |
20110227494 | CIRCUIT BOARD INCLUDING LIGHT-EMITTING ELEMENTS AND DISPLAY APPARATUS INCLUDING THE CIRCUIT BOARD - A circuit board for a display apparatus includes a substrate, a plurality of light-emitting elements arranged substantially in a line on the substrate, and a plurality of branch lines connecting the light-emitting elements to each other in series. A first group of the plurality of branch lines is formed on a first side of the line of the plurality of light-emitting elements, and a second group of the plurality of branch lines is formed on a second, opposing side of the line of the plurality of light-emitting elements. | 09-22-2011 |
20110234112 | LAMP DRIVING CIRCUIT - The present invention provides a lamp driving circuit. When it is used to drive a number of lamps arranged in a hybrid serial-parallel configuration, the lamp driving circuit eliminates the parasitic current in series branch circuits by using an inverse transformer, which makes the current passing each of the lamps in each of the series branch circuits consistent and consequently eliminates the imbalance of each of the lamps. | 09-29-2011 |
20110234113 | LED LAMP - An LED lamp includes two LED modules and a control module. The LED modules emit lights with different color temperatures. The lights are mixed in the LED lamp and form an output light with another color temperature. The control module controls the brightness levels of the lights emitted from the two LED modules to thereby control the color temperature of the output light. | 09-29-2011 |
20110234114 | AC LED LIGHTING ELEMENT AND AC LED LIGHTING SYSTEM METHODS AND APPARATUS - A lighting element ( | 09-29-2011 |
20110248639 | SAMPLING EXTERNAL VOLTAGE WHICH MAY EXCEED INTEGRATED CIRCUIT MAXIMUM VOLTAGE RATING - An LED driver arrangement wherein a low voltage IC is arranged to sample the voltage at a terminal of each of the respective electronically controlled switches controlling a plurality of LED strings each receiving power from a single source, with the single source providing voltage in excess of the voltage rating of the IC. For each electronically controlled switch a controllable current source and an isolating unidirectional electronic valve is provided, the respective current source being enabled only when the respective associated electronically controlled switch is at least partially closed thereby ensuring that the respective isolating unidirectional electronic valve associated with the respective illuminating LED string conducts, and the voltage at the terminal of the respective electronically controlled switch is thus seen by the IC when the associated LED string is producing illumination, the voltage then being lower than the maximum voltage rating of the IC. | 10-13-2011 |
20110260633 | LIGHT CONTROL APPARATUS FOR LIGHT EMITTING DEVICE AND ILLUMINATION SYSTEM - A light control apparatus for a LED light-emitting device comprises a driving current supply unit supplying an AC current as a driving current via a pair of terminals to the LED light-emitting device including a set of LED elements having mutually different light emission wavelength regions connected in parallel while providing opposite polarities and the pair of terminals provided to supply the driving current to the set of LED elements; an individual amount defining unit defining a positive driving current amount and a negative driving current amount respectively to be supplied to the LED light-emitting device in a positive half cycle and a negative half cycle included in one cycle of the AC current respectively. | 10-27-2011 |
20110266963 | Voltage-limiting and reverse polarity series type LED device - The present invention provides LEDs and zener diodes that are homo-polar and connected in parallel to constitute the first set of LED and zener diode and a second set of LED and zener diode; the first LED and zener diode set and the second LED and zener diode assume a reverse polarity series connection to constitute the voltage-limiting and reverse polarity series type LED device; through the selection of connecting pins, it is used on direct current power source or alternating current power source which is its characteristics. | 11-03-2011 |
20110266964 | ELECTRICAL APPLIANCE HAVING A LIGHTING DEVICE HAVING LIGHT EMITTING DIODES - An electrical appliance, particularly a television or a monitor, having a lighting device ( | 11-03-2011 |
20110273100 | USER PROGRAMMABLE LIGHTING CONTROLLER SYSTEM AND METHOD - Lighting systems wherein the lighting effects can be customized by the user to include different colors or different color changing effects. The lighting systems are arranged to be used with different emitters, including but not limited to solid state emitters such as light emitting diodes (LEDs), wherein the LEDs can be divided into zones. The lighting produced in each of those zones can be customized to be a unique color of light or to change colors in a particular way. The lighting system also allows for the different zones to be programmed to cooperate, such as allowing for particular colors of light to flow from one zone to another. Other lighting characteristics can also be controlled, including but not limited to color intensity, speed of color changing or the different colors included in the sequence of color changing. | 11-10-2011 |
20110273101 | FLAT PANEL DISPLAY, LIGHT EMITTING MODULE FOR USE IN FLAT PANEL DISPLAY, AND INTEGRATED CIRCUIT FOR USE IN LIGHT EMITTING MODULE - The present invention discloses a flat panel display (FPD), a light emitting module for use in the FPD, and an integrated circuit for use in the light emitting module. The light emitting module includes: at least one light emitting device string; and a local circuit for controlling current through the light emitting device string and generating a local feedback signal, wherein the local circuit has a first terminal for receiving power, a second terminal for coupling to the light emitting device string to control the current through the light emitting device string, a third terminal for generating the local feedback signal, and a fourth terminal for coupling to ground. The wiring of the FPD is therefore simplified. | 11-10-2011 |
20110285299 | DECORATIVE LIGHT STRING - A decorative light string includes a controller having a master mode and a slave mode, with the master mode being the default. A light strand including a plurality of light emitting elements is operatively coupled to the controller, as is a light pattern selector. In the master mode, the controller is configured to control the light emitting elements according to a setting input at the light pattern selector. A mode select circuit is electronically coupled to the controller, and the controller is configured to enter the slave mode when a control signal is received by the mode select circuit. | 11-24-2011 |
20110291575 | LED DRIVING CIRCUIT AND CONTROL CIRCUIT - A control circuit adapted to control a power converting circuit for stabilizing an output of the power converting circuit is provided. The control circuit includes a capacitor, a charging unit, a discharging unit, a feedback control unit, and a duty-cycle adjusting unit. The charging unit has a first current source coupled to the capacitor for charging the capacitor. The discharging unit is coupled to the capacitor for discharging the capacitor. The feedback control unit controls the charging unit to charge the capacitor according to a feedback signal which represents the output of the power converting circuit. The duty-cycle adjusting unit generates a control signal and adjusts a duty cycle of the control signal according to a voltage of the capacitor. | 12-01-2011 |
20110298382 | LIGHT EMITTING DIODE DRIVING CIRCUIT AND LIGHT EMITTING DIODE ARRAY DEVICE - There is provided an LED driving circuit including: at least one ladder network circuit including: (n+1) number of first branches connected in parallel with one another by n number of first middle junction points between a first junction point and a second junction point, where n denotes an integer satisfying n≧2, (n+1) number of second branches connected in parallel with one another by n number of second middle junction points between the first junction point and the second junction point, the (n+1) number of second branches connected in parallel with the first branches; and n number of middle branches connecting the first and second middle junction points of an identical m sequence to each other, respectively, wherein each of the first and second, and middle branches comprises at least one LED device. | 12-08-2011 |
20110309758 | DRIVING CIRCUIT FOR LED LAMP - A driving circuit for an LED lamp including no more than 4 strings each having an input and an output terminals outputs a DC voltage of no more than 70V to the input terminals. The driving circuit includes constant current circuits each coupled between the output terminal of a corresponding string and ground. An on-off control signal controls whether the constant current circuits work to control whether the LED lamp works. A dimming control signal controls a duty cycle of working of to the constant current circuits to control a brightness of the LED lamp. The driving circuit further includes an overvoltage protection circuit and a switch. When a voltage at one input terminal is too high or a short circuit occurs in one string, the overvoltage protection circuit outputs an overvoltage control signal and accordingly the switch forces the on-off control signal to control the constant current circuits not to work. | 12-22-2011 |
20120001557 | PHASE SHIFT CONTROLLER - A positive counter starts counting, starting with an initial value, upon receiving a positive edge of a dimming pulse signal. A negative edge counter starts counting, starting with an initial value, upon receiving a negative edge of the dimming pulse signal. For each i-th (2≦i≦n) channel, the phase shift amount is calculated by multiplying a period count value that indicates the period of the dimming pulse signal by (i−1)/n. When the count value matches the phase shift amount, a burst control signal is switched to a first level. When the count value matches the phase shift amount, the burst control signal is switched to a second level. | 01-05-2012 |
20120025723 | Systems and Methods for Controlling a Solid State Lighting Panel - Provided are systems and methods for controlling a solid state lighting panel. A system according to some embodiments of the invention includes a controller that provides control signals to current drivers that are configured to provide current to multiple solid state lighting devices. The system also includes a sequence generator that generates a firing sequence for firing multiple strings of slid state lighting devices. | 02-02-2012 |
20120032603 | Light Emitting Device and Driving Method thereof - A light emitting device includes a plurality of light emitting modules and a plurality of voltage controlling circuits capable of being independently controlled. Each voltage controlling circuit includes a dynamic voltage controlling module, a current controlling module, and a luminance controlling module. The dynamic voltage controlling module is used for comparing a voltage level at a second terminal of the light emitting module and a voltage level of a reference voltage source, so as to output a first voltage. The current controlling module is used for adjusting a bias current flowing through the light emitting module, according to the first voltage. The luminance controlling module is used for comparing the first voltage with a clock signal, and for generating a pulse width modulation signal according to a result of the comparison, so as to dynamically control a duty cycle of the light emitting module. | 02-09-2012 |
20120038284 | LIGHTING DEVICE AND LIGHTING SYSTEM - Provided is a lighting device which can be dimmed and subjected to change in color temperature of the lighting color in accordance with a dimming level. To the lighting device, AC power under phase-controlled is supplied. The lighting device is provided with a light emitting elements array and a switching unit. The light emitting elements array includes a plurality of light emitting elements, which are two or more types of light emitting elements having different lighting colors. The switching unit switches an electrical connections between the light emitting elements included in the light emitting elements array so as to change the number of light emitting elements inserted in series to a power supply path and the proportion of numbers of light emitting elements per lighting color among the number of the inserted light emitting elements in accordance with a voltage supplied to the light emitting elements array. | 02-16-2012 |
20120043895 | LED BACKLIGHT MODULE - The present invention discloses a LED backlight module, used for a liquid crystal display apparatus. The LED backlight module comprises a plurality of location areas and a plurality of lighting string sets. The location areas correspond to a plurality of display areas of the liquid crystal display apparatus respectively. Each location area comprises a plurality of sub location areas corresponding to a portion of the display areas respectively. Each lighting string set comprises a plurality of LEDs, which is electrically connected in series, wherein the LEDs of each lighting string set are located in sub location areas in different location areas, respectively. Meanwhile, the sub location areas for locating the LEDs of each lighting string set are not adjacent. Accordingly, the present invention can prevent the whole LED backlight module scrapped due to few LED failure, and therefore, to raise the manufacture yield of the LED backlight module. | 02-23-2012 |
20120043896 | AC DRIVEN LIGHT EMITTING DEVICE - There is provided an alternating current (AC) driven light emitting device including a plurality of LED arrays connected in series, each having a structure in which a plurality of LEDs are electrically connected to form a two-terminal circuit and emit light by a bidirectional voltage when an AC voltage is applied to the two-terminal circuit; and a switching device connected to at least one of the plurality of LED arrays and controlling a total driving voltage with respect to the plurality of LED arrays. The AC driven light emitting device permits operation from a low driving voltage Vf while having a high driving voltage at a high voltage Vf, thereby achieving excellence in terms of power factor, THD, and energy efficiency. | 02-23-2012 |
20120043897 | LED CIRCUITS AND ASSEMBLIES - An AC-driven LED circuit includes a first circuit having a first branch and a second branch which connect at first and second common point The common points provide input and output for an AC driving current from a driver of the circuit The first branch has first LED and second LED, the first LED being connected to second LED in opposing series relationship with the inputs of the first and second LEDs defining a first branch junction A second branch has a third LED and a fourth LED, the third LED is connected to the fourth LED in opposing series relationship with the outputs of the third and fourth LEDs defining a second branch junction Improvement in performance and scalability is provided by adding n diodes to a given basic circuit and x cross connecting circuit branch diodes and providing one or more basic circuits in series and or basic. | 02-23-2012 |
20120056547 | LIGHT-EMITTING ELEMENT DRIVING DEVICE AND IMAGE FORMING APPARATUS USING THE SAME - A light-emitting driving device includes a light-emitting element array including a plurality of light-emitting elements, and a driver including a plurality of driving elements. The plurality of light-emitting elements included in the light-emitting element array are driven by the plurality of driving elements included in the driver. A plurality of signal lines are connected to the plurality of driving elements, respectively. A plurality of power supply lines and a plurality of ground lines are connected to the plurality of driving elements, respectively. An entire line width of each of the plurality of signal lines is greater as a distance thereof from a signal source increases. | 03-08-2012 |
20120062131 | METHOD OF DRIVING A LIGHT SOURCE, LIGHT SOURCE APPARATUS FOR PERFORMING THE METHOD AND DISPLAY APPARATUS HAVING THE LIGHT SOURCE APPARATUS - A light source apparatus includes a plurality of light source parts, a power supply part, a current selection part and a current control part. The plurality of the light source parts are connected in parallel and the power supply part provides power to a first terminal of each of the light source parts. The current selection part selects the current level of one of the light source parts as a reference current level. The current control part adjusts the levels of the currents flowing through the light source parts to be substantially equal to the reference current level. Selection of the light source part that provides the reference current level is dynamically changed. | 03-15-2012 |
20120068615 | System and Method for Color Mixing Lens Array - Embodiments described herein provide optical systems that can mix colors to produce illumination patterns having a large area with uniform color. One embodiment of an optical system can include a set of optical units that each produces an illumination pattern with uniform color and intensity. The optical units are spaced so that the individual illumination patterns overlap to create an overall illumination pattern with an overlap area. In the overlap area, the colors emitted by the individual optical units mix to create a desired color. Embodiments of optical systems can provide beam control so that the optical units emit a high percentage of light in beam. | 03-22-2012 |
20120074856 | LIGHT-EMITTING ELEMENT DRIVING DEVICE - Short circuit failures and open circuit failures of light-emitting elements used for the backlight in an LCD panel can be reliably and easily detected. The voltage at the node between each series-connected light-emitting element array and a drive circuit is detected as a monitored voltage. A maximum detector detects the highest and a minimum detector detects the lowest of these monitored voltages. Short circuit or open circuit failure of a light-emitting element is detected by comparing the voltage difference between the maximum detector output and the minimum detector output with a specific reference voltage. | 03-29-2012 |
20120081016 | LED DRIVER WITH ADAPTIVE DYNAMIC HEADROOM VOLTAGE CONTROL - A multi-channel LED driver includes a plurality of linear current regulators, each connected to a bottom of a string of series connected LEDs of a multi-channel LED that controls a bias current and the string of series connected LEDs responsive to an LED bias reference voltage. A dynamic headroom regulation voltage control circuit monitors the headroom regulation voltage at the bottom of each string of the series connected LEDs in the multi-channel LED and generates a reference voltage controlling each of the headroom regulation voltages responsive to the LED bias reference voltage. | 04-05-2012 |
20120098443 | WHITE AC LED - A multi-color white LED which can be driven by a single current, and more particularly, to the use of a specific ratio of numbers of different color LEDs to obtain a specific desired color while running all of them at the same current. | 04-26-2012 |
20120119665 | LIGHTING DEVICE WITH ADJUSTABLE COLOR TEMPERATURE - A lighting device with adjustable color temperature includes a power, a driver, and a plurality of branches. The power is electrically connected to the driver for supplying power to the driver. Each of the branches includes a light source and an adjustor connected in series. The adjustor controls the color temperature of the light source in a corresponding branch by adjusting the voltage through the corresponding branch. | 05-17-2012 |
20120126714 | BLEEDER CIRCUIT - Bleeder circuits ( | 05-24-2012 |
20120133292 | CONTROLLER SYSTEM, INTEGRATED CIRCUIT AND METHOD THEREFOR - A controller system controls a plurality of lighting element arrays. The controller system comprises array selection module for selecting a lighting element array, voltage control module arranged to apply a voltage to at least the selected lighting element array, a common current source arranged to provide a current from the common current source to the selected lighting element array, and duty cycle control module arranged to control a ratio of the current to the selected lighting element array over a time sharing cycle. The duty cycle control module is arranged to cause the array selection module to sequentially select the lighting element arrays in accordance with a time-sharing cycle, to cause the current from the common current source to be provided to the selected lighting element array in accordance with a respective duty cycle setting, and to cause the current provided to the selected lighting element array to be compensated for a rise time of the voltage applied thereto in order to be accurate with respect to the programmed settings. | 05-31-2012 |
20120139429 | DISPLAY DEVICE - Provided is a display device in which design properties have been improved by eliminating the flickering when the display level changes. A microcomputer ( | 06-07-2012 |
20120146519 | LIGHTING APPARATUS AND CIRCUITS FOR LIGHTING APPARATUS - The present invention discloses a lighting apparatus that includes a plurality of parallel circuits and a common circuit. The parallel circuits each comprise a switching transistor and a set of LEDs, the sets of LEDs having different characteristics such as different light output wavelengths. In operation, one of the parallel circuits is selected by activating the corresponding switching transistor, thus selecting the respective LEDs to be activated. The common circuit also comprises a set of LEDs, these LEDs being activated no matter which parallel circuit is selected. In various implementations, the lighting apparatus can generate a wide spectrum of light outputs by selectively activating the plurality of parallel circuits within time slots of a duty cycle. In some cases, balancing of loads across the parallel circuits is desired to maintain the appropriate current flowing through the LEDs. | 06-14-2012 |
20120146520 | POWER MANAGEMENT AND CONTROL MODULE AND LIQUID CRYSTAL DISPLAY DEVICE - A power management and control module adapted for a liquid crystal display device includes a boost-type DC/DC topology circuit, a LED dimming control circuit and a multiplexer. The boost-type DC/DC topology circuit has a voltage output terminal electrically connected with a logic high power supply terminal of a gate driving circuit and a power supply terminal of a LED backlight source. The LED dimming control circuit is electrically connected with the LED backlight source for dimming operation. A first and second data input terminals of the multiplexer are electrically connected to the voltage output terminal through a first and second feedback networks respectively. The LED backlight source is electrically connected in the second feedback network. A data output terminal of the multiplexer is electrically connected to the boost-type DC/DC topology circuit and alternatively communicated with the first or second data input terminal to provide a feedback input voltage. | 06-14-2012 |
20120146521 | Method for Driving Light-Emitting Element and Method for Driving Light-Emitting Device - A method for driving a light-emitting element is provided with two steps: a first step of performing constant current drive; and a second step of increasing the absolute value of a voltage with time. It is assumed that a short circuit between a pair of electrodes occurs when a voltage which is applied to the light-emitting element is lower than or equal to the emission start voltage. A shift from the first step to the second step occurs when this condition is satisfied. Accordingly, a high current can be passed through a short-circuited portion between the pair of electrodes in the second step. The portion is insulated by heat (a short circuit between a pair of electrodes can be repaired), so that deterioration in the light-emitting element can be suppressed, and luminance of the light-emitting element can be recovered. | 06-14-2012 |
20120146522 | LIGHT EMITTING DIODE DRIVER USING TURN-ON VOLTAGE OF LIGHT EMITTING DIODE - A driver circuit for driving light emitting diodes (LEDs). The driver circuit for driving light emitting diodes (LEDs) includes a string of LEDs divided into n groups. The n groups of LEDs are electrically connected to each other in series and the downstream end of group m−1 is electrically connected to the upstream end of group m, where m is a positive number equal to or less than n. The driver circuit also includes a plurality of current regulating circuits, where each of the current regulating circuits is coupled to a downstream end of a corresponding group and has at least one transistor and a detector for measuring a current flowing through the corresponding group. | 06-14-2012 |
20120153848 | REFERENCE VOLTAGE GENERATING CIRCUIT AND LED DRIVER CIRCUIT HAVING THE SAME THEREIN - A reference voltage generating circuit used for a light-emitting diode (LED) driver circuit and a light-emitting diode (LED) driver circuit are provided. A reference voltage generating circuit used for a light-emitting diode (LED) driver circuit includes a voltage measurer configured to sequentially measure feedback voltages of a plurality of LED arrays, the LED arrays being connected to one another in parallel, a quantizer configured to search for one of the plurality of LED arrays having a lowest feedback voltage of the measured feedback voltages, a comparator configured to compare an output of the voltage measurer with a preset comparison voltage to generate a reference voltage, and a timing controller configured to control the comparator to output the generated reference voltage corresponding to the one of the plurality of LED arrays. | 06-21-2012 |
20120153849 | AC DRIVEN LIGHT EMITTING DEVICE - Provided is an alternating current (AC) driven light emitting device, including: a plurality of half-wave driving units respectively having at least one light emitting diode (LED) and provided in a loop connecting respective half-wave driving unit terminals; and at least one full-wave driving unit having at least one LED and connecting one node between two of the plurality of half-wave driving units to another node between another two of the plurality of half-wave driving units, at least one of the half-wave driving unit and the full-wave driving unit having a parallel connection structure of at least two LEDs. An array of LEDs appropriate to being drivable by AC is provided to secure reliability in error in operation of some LEDs. | 06-21-2012 |
20120153850 | METHOD FOR DATA PATH CREATION IN A MODULAR LIGHTING SYSTEM - It is disclosed a method for operating a lighting system, which lighting system comprises a plurality of lighting modules, each of which comprises at least one communication unit, via which the respective lighting module is adapted to communicate with at least one neighboring lighting module. A control device may be adapted to communicate control signals to at least one of the lighting modules and each of the lighting modules may be adapted to further communicate control signals communicated to the lighting module to a neighboring lighting module. The method comprises assigning a communication unit of each of a plurality of lighting modules to be an active communication unit associated with a minimum control signal path length value with respect to all of the communication units of the lighting module, as measured from the control device to the communication unit, whereby optimal control signal data paths, each data path being adapted to communicate control signals from the control device to a lighting module, may be formed. It is further disclosed a lighting system adapted to perform the method. | 06-21-2012 |
20120153851 | DIMMABLE LIGHT SOURCE WITH LIGHT TEMPERATURE SHIFT - An illumination device ( | 06-21-2012 |
20120153852 | LED ILLUMINATING DEVICE FOR STAGE LIGHTING AND METHOD FOR IMPROVING COLOR UNIFORMITY OF THE DEVICE - A LED illumination device for stage lighting includes LED arrays ( | 06-21-2012 |
20120161652 | LED ILLUMINATION APPARATUS - A light emitting diode (LED) illumination apparatus includes an LED illumination circuit and a constant current drive circuit to provide constant current to the LED illumination circuit. The LED illumination circuit includes at least two lighting branches connected in parallel, and each of the at least two lighting branches includes at least one LED and a current regulative diode connected in series. | 06-28-2012 |
20120161653 | ARRAY CONSTANT-CURRENT MULTI-DRIVING CIRCUIT - An array constant-current multi-driving circuit drives a plurality of light-emitting devices connected in parallel. Each light-emitting device includes a plurality of light-emitting diodes (LED) connected in series. The constant-current multi-driving circuit includes a bias circuit for generating a bias voltage, a Keener diode controlled by the bias voltage and being capable of clamping an output voltage to a predetermined reference voltage value, and an amplifying circuit controlled by the reference voltage value and for outputting a driving current for driving the light-emitting devices. Through the predetermined reference voltage and a second resistor connected to a second transistor in each light-emitting device, the light-emitting devices are enabled to operate under a constant current, thereby achieving a target of driving a plurality of light-emitting devices under a constant current with a single Keener diode. | 06-28-2012 |
20120176050 | LED DRIVING CONTROL CIRCUIT AND LED DRIVING CIRCUIT - The present invention provides an LED (Light-Emitting Diode) driving control circuit for controlling a converting circuit to transform an input power source into an output voltage for driving an LED module. The LED module has a plurality of LED strings. The LED driving control circuit includes a voltage detecting circuit and a feedback control circuit. The voltage detecting circuit has a plurality of detection circuits, and each detection circuit is coupled to a terminal of the corresponding LED string to determine whether a voltage of the terminal is higher or lower than a preset value. The voltage detecting circuit generates a feedback signal according to the determination results. The feedback control circuit controls the converting circuit to modulate the output voltage according to the feedback signal. | 07-12-2012 |
20120176051 | NON-RECTANGULAR PIXEL ARRAY AND DISPLAY DEVICE HAVING SAME - There is provided a display area made up of a pixel array with a non-rectangular shaped outer circumference and the pixel array is made up of a plurality of non-rectangular pixels wherein a first conductor line group including a plurality of first conductor lines and a second conductor line group including a plurality of second conductor lines, and a third conductor line group including a plurality of third conductor lines are arranged so as to intersect with one another. Thus, without sacrificing brightness, viewability, and fidelity of an image, pixel array (display device) with the non-rectangular outer circumferential shape being excellent in design characteristics is realized. | 07-12-2012 |
20120187854 | LIGHT-EMITTING DEVICE - An object is to solve a problem in that, in a light-emitting device including a plurality of units including a light-emitting element group connected in series, when disconnection is caused, a current does not flow to the whole of the unit and the whole of the unit is in a non-light emitting state. A light-emitting device has a circuit in which a plurality of units each including a light-emitting element group connected in series using a connection wiring group is provided and the plurality of units is connected in parallel. Further, the circuit includes a subsidiary wiring for electrically connecting one of the connection wirings included in one of the units and one of the connection wirings included in another of the units, whereby a countermeasure against disconnection can be taken. | 07-26-2012 |
20120187855 | LIGHT EMITTING DIODE DRIVING CIRCUIT AND SYSTEM - A light emitting diode (LED) driving circuit is provided. The LED driving circuit includes: at least one LED driving module, coupled to the at least one LED series, for driving the corresponding LED series; and a voltage regulating module, coupled to the at least one LED driving module, for providing a regulation signal according to an output signal from the at least one LED driving module, wherein an input voltage of the at least one LED series is regulated according to the regulation signal. | 07-26-2012 |
20120194086 | LIGHT EMITTING DIODE TUBE AND LIGHT EMITTING DIODE LAMP USING THE SAME - A light emitting diode (LED) tube and an LED lamp using the same are provided. The LED tube is suitable for direct installation in a lamp holder which has a starter and a ballast. The LED tube includes an LED array, an LED driver, and a rectification-block diplexer. When the LED array is driven by the LED driver, the rectifier-block diplexer disables the starter and the ballast and at the same time receives and converts an AC power supply. Thus the rectifier-block diplexer provides an operating voltage to the LED driver. Without removing the starter and shorting the ballast, the user can easily install the LED tube into a traditional fluorescent lamp socket, saving the cost of lamp modification, thus achieving the purpose of energy saving and environmental protection. | 08-02-2012 |
20120194087 | Systems and Methods for Driving Light Emitting Diodes - System and methods are provided for driving one or more light emitting diodes (LEDs) to reduce audible noise. An example system includes a switching component, a system controller, and a current generator. The switching component is configured to receive a dimming signal with a predetermined dimming frequency and configured to switch on or off the one or more LEDs in response to the dimming signal, the predetermined dimming frequency being outside a frequency band of the audible noise. The system controller is configured to receive a feedback signal related to a LED current that flows through the one or more LEDs and configured to generate a drive signal. Additionally, the current generator is configured to receive the drive signal, to generate a charging current to store energy during a charging period and to generate the LED current during a discharging period. | 08-02-2012 |
20120212143 | LIGHTING DEVICE AND ILLUMINATION APPARATUS INCLUDING SAME - A lighting device includes a lighting unit which controls a current being supplied to a load, in which light emitting modules, each having one or more semiconductor light emitting elements connected in series, are connected in parallel, to be a constant current; a current detector which detects a current flowing through one of the light emitting modules; and an abnormality detector which compares a detected value from the current detector with an upper limit and a lower limit of a predetermined current range to detect an abnormality in the load. The abnormality detector detects the abnormality in the load if the detected value from the current detector is larger than the upper limit or smaller than the lower limit, and if the abnormality in the load is detected, the lighting unit reduces the current being supplied to the load. | 08-23-2012 |
20120217885 | LIGHT EMITTING DEVICE FOR AC POWER OPERATION - Disclosed is an improved light-emitting device for an AC power operation. An AC light-emitting device according to the present invention employs a variety of means by which light emission time is prolonged during a ½ cycle in response to a phase change of an AC power source and a flicker effect can be reduced. For example, the means may be switching blocks respectively connected to nodes between the light emitting cells, switching blocks connected to a plurality of arrays, or a delay phosphor. Further, there is provided an AC light-emitting device, wherein a plurality of arrays having the different numbers of light emitting cells are employed to increase light emission time and to reduce a flicker effect. | 08-30-2012 |
20120217886 | BACKLIGHT UNIT - The present invention relates to a backlight unit that includes at least one first light emitting diode (LED) package and at least one second LED package, wherein the first LED package includes a blue LED chip, a green LED chip, and a first phosphor, the first phosphor being excited by blue light and to emit light to be mixed with blue light and green light respectively emitted from the blue LED chip and the green LED chip, the first LED package to thereby emit white light. The second LED package includes a blue LED chip, a red LED chip, and a second phosphor, the second phosphor being excited by blue light and to emit light to be mixed with blue light and red light respectively emitted from the blue LED chip and the red LED chip, the second LED package to thereby emit white light. | 08-30-2012 |
20120229035 | LIGHTING APPARATUS HAVING HIGH OPERATION RELIABILITY AND LIGHTING SYSTEM USING THE SAME - A lighting apparatus having high operation reliability includes a first lighting unit with a first turn-on voltage and a second lighting unit with a second turn-on voltage greater than the first turn-on voltage. The lighting apparatus is put in use for generating output light according to a driving current flowing through the first lighting unit or the second lighting unit. The first lighting unit is capable of generating output light having a first brightness according to the driving current. The second lighting unit, electrically connected in parallel with the first lighting unit, is capable of generating output light having a second brightness according to the driving current. The second brightness is preferably identical to the first brightness. | 09-13-2012 |
20120229036 | LIQUID CRYSTAL DISPLAY DEVICE - The liquid crystal display device is a display device, having; a display panel; a backlight having light emitting diode columns; and an LED driver IC for driving the light emitting diode columns, wherein the light emitting diode columns are formed of a number of light emitting diodes, the LED driver IC controls the voltage applied to said light emitting diode columns so that the current that flows through a light emitting diode column and is inputted into the LED driver IC is a predetermined constant current, the display device further has a current amplifying unit for amplifying the reference current inputted into the LED driver IC and allowing the amplified reference current to flow through a light emitting diode column, and the current inputted into the LED driver IC and the current amplified by the current amplifying unit flow through a light emitting diode column. | 09-13-2012 |
20120229037 | HIGH EFFICIENCY, LOW ENERGY STORAGE DRIVER CIRCUIT FOR SOLID STATE LIGHT SOURCES - A device, system and method to drive light emitting diodes (LEDs) are disclosed. An exemplary system may include a string of LEDs coupled across a voltage source configured to provide an input voltage. The string of LEDs may include a plurality of separate groups of LEDs and a plurality of switch circuits. Each of the switch circuits may include a switch coupled in parallel with an associated one of the groups of LEDs to control current flow through the associated group of LEDs in response to a control signal from a controller circuit. A switch protection circuit may be associated with at least one of the switches. A steering circuit may also be coupled in series and associated with each of the groups of LEDs. | 09-13-2012 |
20120229038 | MILLISECOND DECAY PHOSPHORS FOR AC LED LIGHTING APPLICATIONS - Cehlorosilicate-based phosphors configured to emit yellow-green light in a wavelength ranging from about 500 nm to about 560 nm in response to an excitation source emitting at about 400 nm to about 480 nm, wherein the light emitted by the phosphor has a decay time ranging from about 1 millisecond (1 ms) to about 10 milliseconds (10 ms). The phosphor comprises a compound of the family Ca | 09-13-2012 |
20120235584 | AC DRIVEN LIGHT EMITTING DEVICE - An alternating current (AC) driven light emitting device includes a substrate, K number of first light emitting diode (LED) cells arranged in a row on a top surface of the substrate, where K is an integer satisfying K≧3, K number of second LED cells arranged in a row parallel to the row of the first LED cells on the top surface of the substrate, and (K−1) number of third LED cells arranged in a row between the respective rows of the first and second LED cells on the top surface of the substrate. The AC driven light emitting device has a connection structure between LED cells to be operable at an AC. | 09-20-2012 |
20120242236 | APPARATUS AND METHOD FOR LED ARRAY CONTROL - A control module for driving an LED array, with the array including N number of LED current drivers connected to N number of electrical terminals of the module, and Y number of transistor switches connected between Y number of electrical terminals of the module and a common voltage point. N and Y are each at least three. An N number of column conductors and a Y number of row conductors are to be connected to the respective N and Y number of electrical terminals. At least one of the N×Y number of LEDs is connected between each pair of the column and row conductors. The control module further includes a controller for controlling the states of the N number of LED current drivers and the Y number of transistor switches so that, during a given LED drive period, all of the LED current drivers are activated and only one of the transistor switches is turned ON to provided a selected row conductor in which case only those LEDs connected to a selected row conductor are activated. | 09-27-2012 |
20120248997 | APPARATUS AND METHOD FOR DRIVING LIGHT EMITTING DIODE - An apparatus for driving an LED device having a plurality of LED channels is disclosed. Each LED channel has a plurality of LEDs connected in series. A power converter converts an input voltage into an output voltage and outputs the output voltage to an output terminal that is connected to first terminals of the plurality of LED channels. A plurality of current controllers are connected to second terminals of the plurality of LED channels, respectively. Each current controller controls a current of a corresponding LED channel. A detection controller determines a detection time based on voltages of the second terminals of the plurality of LED channels. A state detector detects the open-circuited states of the plurality of LED channels based on voltages of the second terminals of the plurality of LED channels at the detection time. | 10-04-2012 |
20120262075 | MULTIPLE STAGE SEQUENTIAL CURRENT REGULATOR - An LED driver circuit operating from the AC power line providing high efficiency, good line and load regulation, high power factor, low line current harmonics, low conducted EMI, high LED utilization, and lamp dimming compatibility, while consisting of a minimal number of components. No inductors, nor capacitors (including electrolytics), nor high current switching transistors are employed. The top of a string of series connected LED segments is connected to the output of a rectifier, which in turn is connected to an AC sine wave power source. The string is tapped at various locations, including the bottom of the string. Each segment can consists of any number of serial or parallel connected LEDs. Current control elements or regulators sink current at each tap and are sequentially turned on and off one at a time, tracking the rectified sine wave voltage. Voltage across each regulator and current when conducting is individually controllable. Power loss in the regulators is minimized by keeping regulator voltage to a minimum. The regulators may control current in a multitude of ways, including a constant current, or a current dependent on voltage across the regulators including a resistor, or a combination. The driver is self-commutating, with the sequencing of the current control elements an inherent feature closely integrated with the current control elements and providing optimal performance over variable operating conditions. Given the large number of design variables, the driver circuit can be optimized for various performance criteria including input voltage range, line/load regulation, output power/current, efficiency, power factor, line current harmonics, dimmer compatibility, and LED utilization. | 10-18-2012 |
20120262076 | MODULAR LED STRIP LIGHTING APPARATUS - A LED based lighting apparatus is disclosed. The light engine used in the lighting apparatus may use a multi-layer metal core printed circuit board and have a plurality of LED groups that are independently controllable by a control unit. The power supply input and return paths connected to each LED group may be implemented on different layers to allow a compact footprint that may be used with traditional fluorescent encasements with relatively little modification. | 10-18-2012 |
20120268021 | MULTI-CHANNEL LED DRIVING SYSTEM - A multi-channel LED driving system includes a power adapter, a rectifying and filtering unit, a plurality of LED strings, and a plurality of linear regulators, a CC/CV controller, an optically coupled isolator and a PWM controller. The CC/CV controller detects the conducting currents flowing though the LED strings and DC voltage source outputting from the rectifying and filtering unit, and provides voltage compensation of the power adaptor. In addition, the linear regulators slightly modulate the current difference between the LED strings to achieve current-sharing control, thus stabilize the illuminating brightness generating by the LED. | 10-25-2012 |
20120268022 | IMAGE PROCESSING CIRCUIT AND LIGHT ILLUMINATION MODULE - An image processing circuit and a light illumination module are provided. The light illumination module has an integrated circuit and a plurality of light emitting diode (LED) strings connected in parallel. The integrated circuit could be the image processing circuit. Each of the LED strings has a plurality of LEDs connected in series. | 10-25-2012 |
20120280631 | Illumination Source Using LEDs and OLEDs - A first device is provided, wherein the first device is an illumination source comprising OLEDs and inorganic LEDs. The first device includes a first light source that has one or more first light emitting devices. Each of the first light emitting devices includes an inorganic light emitting diode (LED) that emits light that has a peak wavelength in the visible spectrum between 400 and 500 nm. The device also includes a second light source that has one or more second light emitting devices. Each of the second light emitting devices comprises an organic light emitting diode (OLED) that emits light that has peak wavelength in the visible spectrum between 500 and 800 nm. The device also includes a driving component. The first light source and the second light source are disposed such that their emissions combine. | 11-08-2012 |
20120280632 | LIGHT EMITTING DIODE DRIVING APPARATUS AND METHOD FOR DRIVING THE SAME - According to example embodiments, a light emitting diode driving includes a power converter configured to convert a power supply voltage into a lamp driving power supply voltage in response to a voltage control signal, first and second light emitting diode strings supplied with the lamp driving power supply voltage, a first slave driver circuit configured to detect headroom voltages of the second light emitting diode strings and to output a first slave headroom error signal in response to the detected headroom voltages, and a master driver circuit configured to detect headroom voltages of first light emitting diode strings and to output a master headroom error signal in response to the detected headroom voltages of the first light emitting diode strings. The master driver circuit may be configured to output the voltage control signal in response to the master and the first slave headroom error signals. | 11-08-2012 |
20120293082 | Light emitting device open/short detection circuit - The present invention discloses a light emitting device open/short detection circuit, which is used for detecting at least one light emitting device string open/short. Each light emitting device string has a first end and a second end, wherein the first end is coupled to a voltage supply circuit to supply electrical power to the light emitting devices. The open/short detection circuit includes: an abnormal voltage detection circuit coupled to the light emitting device strings for receiving voltages of the second ends respectively and generating an abnormal voltage detection signal; a voltage setting circuit coupled to the abnormal voltage detection circuit for setting an abnormal reference level; and a determination circuit coupled to the voltage setting circuit. When the abnormal voltage detection signal is equal to or over the abnormal reference level, the determination circuit generates an open/short detection signal for an abnormal condition detected. | 11-22-2012 |
20120293083 | High Frequency Multi-Voltage And Multi-Brightness LED Lighting Devices And Systems And Methods Of Using Same - A system and method transforming AC voltage to a high-frequency AC voltage and providing the high-frequency AC voltage to an AC LED circuit or rectifying the high-frequency circuit to a DC voltage and providing the DC voltage to a DC LED circuit. | 11-22-2012 |
20120299491 | Lighting Device with Color Temperature Adjusting Functionality - The present invention relates to a lighting device with color temperature adjusting functionality, comprising: a light-emitting device array module, a first driving unit, a second driving unit, a third driving unit, a fourth driving unit, a main controlling unit, and a power management unit, wherein the first driving unit, the second driving unit, the third driving unit, the fourth driving unit are used for respectively driving a first high color temperature light-emitting device array, a first low color temperature light-emitting device array, a second low color temperature light-emitting device array, and a second high color temperature light-emitting device array of the light-emitting device array module, so as to selectively drive a plurality of first high color temperature light-emitting devices, a plurality of first low color temperature light-emitting devices, a plurality of second low color temperature light-emitting devices, and a plurality of second high color temperature light-emitting devices to emit a color light with a specific color temperature. | 11-29-2012 |
20120299492 | LED DRIVING CIRCUIT - The invention is directed to the provision of an LED driving circuit that switches the connection of LED blocks with proper timing in accordance with the supply voltage and the Vf's specific to individual LEDs contained in each LED block. The LED driving circuit includes a rectifier, a first circuit which includes a first current detection unit for detecting current flowing through a first LED array, and a first current control unit for controlling current flowing from the first LED array to a negative power supply output in accordance with the current detected by the first current detection unit, and a second circuit which includes a second current detection unit for detecting current flowing through a second LED array, and a second current control unit for controlling current flowing from a positive power supply output to the second LED array in accordance with the current detected by the second current detection unit, and wherein a current path connecting the first LED array and the second LED array in parallel relative to the rectifier and a current path connecting the first LED array and the second LED array in series relative to the rectifier are formed. | 11-29-2012 |
20120306390 | Architecture for Supporting Modulized Full Operation Junction Ultra High Voltage (UHV) Light Emitting Diode (LED) Device - The present disclosure provides an ultra high voltage (UHV) light emitting diode (LED) device. According to one embodiment, the device includes a substrate, a plurality of LED junctions disposed above the substrate and coupled to one another, and a control component including a plurality of switches embedded within the substrate and coupled to the plurality of LED junctions to control routing of current across the plurality of LED junctions. | 12-06-2012 |
20120306391 | Modulized Full Operation Junction Ultra High Voltage (UHV) Device - The present disclosure provides advantageous methods for controlling an ultra high voltage (UHV) light emitting diode (LED) device. In one embodiment, a method includes routing a first constant step current through a plurality of LED junction modules disposed over a substrate, each of the plurality of LED junction modules coupled in parallel to one another, and each of the plurality of LED junction modules including a plurality of LED junctions coupled in series. The method further includes reconfiguring a coupling scheme of the plurality of LED junction modules, and routing a second constant step current through the plurality of LED junction modules to provide a substantially same load to each LED junction. | 12-06-2012 |
20120306392 | LIGHT-EMITTING DIODE NETWORK - LED devices or circuits include a number of serially connected LED segments, which may additionally include parallel branches, which are switched on or off depending on an input voltage to the LED segments. As the input voltage varies, none, different portions, or all of the LEDs are lit. The input voltage to the LED segments may be an output voltage from a bridge rectifier in response to an alternate current (AC) power. The LED devices or circuits include no inductors, transformers and electrolytic capacitors. | 12-06-2012 |
20120319601 | LIGHT SOURCE MODULE, METHOD OF DRIVING THE LIGHT SOURCE MODULE AND DISPLAY APPARATUS HAVING THE LIGHT SOURCE MODULE - A light source module includes a LED array, a switch and a control part. The LED array includes a plurality of LED rows and a bridge light emitting part connecting the LED rows with each other. Each of the LED rows has a first direction light emitting part and a second direction light emitting part which are alternately disposed with each other. The switch adjusts an intensity of a current applied to the LED array. The control part determines an output status of the LED array and provides a control signal to the switch. | 12-20-2012 |
20120319602 | LIGHT EMITTING DEVICE AND ILLUMINATION APPARATUS HAVING SAME - A light emitting device includes a set of light source units including multiple types of solid state light emitting elements having different light colors, each of the light source units comprising the same type of the solid state light emitting elements connected in series and; and an information storage unit which stores information about electrical characteristic of the set of light source units. The information stored in the information storage unit represents a relationship between a light output and a drive current in the set of light source units. | 12-20-2012 |
20120319603 | METHOD TO SUPPLY POWER TO AN LED ARRAY AS WELL AS THE CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD - The present invention relates to a method to supply power to an LED array, comprising at least two LED branches connected in parallel, in each of which at least one LED is arranged. The LED array is supplied with predetermined power from a current source connected in series, wherein currents are measured in the LED branches, wherein the measured currents are compared in control electronics, and wherein the currents are controlled in a part of the LED branches such that they have a defined ratio with respect to one another in the LED branches. The method is intended to be improved such that it can be carried out economically and with simple means. This is achieved in that one of the LED branches is selected to be the master whose current is utilized as the target specification for the remaining LED branches. | 12-20-2012 |
20130002157 | Semiconductor Light Emitting Devices Having Selectable and/or Adjustable Color Points and Related Methods - Light emitting devices include a first string of LEDs that emit light having a color point that is within at least eight MacAdam ellipses of a first blue-shifted-yellow region on the 1931 CIE Chromaticity Diagram, a second string of LEDs that emit light having color point that is within at least eight MacAdam ellipses of a second blue-shifted-green region on the 1931 CIE Chromaticity Diagram, and a third light source that emits radiation having a dominant wavelength between 600 and 720 nm. A drive circuit supplies respective drive currents to the first string of LEDs, the second string of LEDs and the third light source, at least two of which are independently controllable. | 01-03-2013 |
20130009558 | BACKLIGHT UNIT - There is provided a backlight unit (BLU). The BLU may include: a plurality of LED modules, each LED module including a plurality of LEDs; and one or more driving drivers controlling brightness of the plurality of LEDs included in each of the plurality of LED modules, wherein at least two LED modules among the plurality of LED modules are commonly connected to one of the driving drivers in parallel. | 01-10-2013 |
20130020952 | AC Direct Drive Organic Light Emitting Diode Assembly - The present invention is related to AC direct drive organic light emitting diode assembly which comprises parallelly connected a positive duty OLED serial and a negative duty OLED serial receiving an AC voltage. A positive duty of the AC voltage actives the positive serial OLED to generates light output and a negative duty of the AC voltage lights on the negative serial OLED so that the present invention can be driven directly with AC power. The present invention provides a sparkless light output OLED assembly having a very low production cost and being very convenience to use. | 01-24-2013 |
20130026933 | LED BACKLIGHT DRIVE CIRCUIT - An LED backlight drive circuit comprises a plurality of LED lamp strings connected in parallel, a constant-current control circuit for controlling magnitudes of currents flowing through the LED lamp strings to be the same, and a plurality of constant-voltage units. The number of the constant-voltage units is the same as that of the LED lamp strings. The constant-voltage units are connected between the LED lamp strings and the constant-current control circuit respectively. Each constant-voltage units comprises an MOS transistor and a first operational amplifier. The MOS transistor has a drain connected to a cathode of a corresponding LED lamp strings, a gate connected to an output terminal of the first operational amplifier and a source connected to the constant-current control circuit. The first operational amplifier has a positive input terminal connected to a reference voltage and an inverting input terminal connected to the source of the MOS transistor. | 01-31-2013 |
20130033185 | EXTENDABLE LIGHT SOURCE WITH VARIABLE LIGHT EMITTING AREA - Embodiments may provide an extendable light source with a variable light emitting area. A first device is provided that includes a support, a first substrate movably coupled to the support, and a plurality of lighting devices disposed on the first substrate. The plurality of lighting devices includes a first portion of lighting devices and a second portion of lighting devices. The first device also includes an energizing component that is configured to selectively energize the first portion and the second portion of lighting devices based on a position of the first substrate relative to the support. | 02-07-2013 |
20130033186 | LIGHT EMITTING DEVICE - Provided is a light-emitting device that aims not to affect a service life and characteristics of light emission by releasing heat from a substrate on that a plurality of LED elements mounted, and the LED elements generate the heat. | 02-07-2013 |
20130057166 | LED Backlight Driving Method, Liquid Crystal Display Device and LED Backlight Driving Circuit - The present invention discloses a LED backlight driving method, a LCD device and a LED backlight driving circuit, wherein the LED backlight driving method comprises the following steps: regulating the current of each LED string so that the voltages of all LED strings are equal; and regulating the duty cycle of the current of the corresponding LED string so that the effective value of the current of each LED string meets the preset requirement of brightness. The present invention solves the problem of consumption caused by voltage difference by regulating the current through the current regulation module to ensure that the voltages of all the LED strings are equal, and ensures the brightness consistency by regulating the duty cycle through the duty-cycle regulation module so that the effective value of the currents of all the LED strings are equal. | 03-07-2013 |
20130063035 | DIMMABLE LED LIGHT FIXTURE HAVING ADJUSTABLE COLOR TEMPERATURE - Electronic circuitry for color-mixing in an LED light fixture during AC power dimming is disclosed to achieve adjustable color temperature. According to one embodiment, a dimmable LED light fixture has first, second, and third LED light sources, the first and second LED light sources producing white light, the third LED light source producing colored light, the LED driver configured to power the LED light sources by providing a single-channel variable-DC current source having two output terminals, and a current regulator for maintaining the current in the third LED light source path substantially constant as the LED driver output current is decreased when the AC power is reduced by the dimmer module, thereby altering the color of the light produced by the combination of the LED light sources. | 03-14-2013 |
20130063036 | CIRCUIT FOR ELIMINATING THRESHOLD VOLTAGE DIFFERENCE BETWEEN BACKLIGHT LED STRINGS AND LIQUID CRYSTAL DISPLAY USING THE SAME - The circuit eliminating threshold voltage differences between backlight LED strings includes a voltage supply input, a number of first switching units, and a number of LED strings. The LED strings are connected to each other in parallel, and one end of each LED string is connected to the voltage supply input and the other end thereof is connected to the corresponding first switching unit. The constant current controller includes a constant current source for supplying a constant current to each LED string, a current detector for detecting a working current of each LED string, a comparator for comparing the working current of each LED string and the constant current, and outputting a comparing result, and a square wave generator for outputting driving signals of different frequencies each which is capable of driving the corresponding LED string to work at the corresponding frequency. | 03-14-2013 |
20130076254 | LED Driving Circuit Preventing Light Leakage Issue - A light emitting diode (LED) driving circuit preventing light leakage issue. The LED driving circuit comprises an LED driver, a driving circuit module and a power supply. When an input voltage is much higher, a high frequency pulse width modulation signal is set to a low level to avoid a light leakage of the LED by turning off a metal oxide semiconductor field effect transistor (MOSFET), such that the input voltage is not limited by the light leakage of the LED. As a result, the input voltage can be increased sufficiently for further reducing a switching loss effectively. | 03-28-2013 |
20130088159 | LIGHT-EMITTING DEVICE - A light-emitting device includes a mounting area that includes a first end and a second end opposite to the first end, a first electrode group disposed adjacent to the first end of the mounting area, a second electrode group disposed adjacent to the second end of the mounting area, a plurality of files each in that a plurality of light-emitting elements are arranged in the mounting area to extend from a vicinity of the first end of the light-emitting area to a vicinity of the second end of the mounting area and electrically connected in series with each other of the light-emitting elements in each file. Light-emitting elements included in two or more files can be a light-emitting block to be lighted together through electrodes of the first electrode group and the second electrode group. | 04-11-2013 |
20130093338 | DRIVING CIRCUITS FOR LIGHT EMITTING ELEMENTS - A circuit for driving light emitting elements, such as LEDs, includes a first transistor having a source coupled to ground through a first resistive element, and a second transistor having a gate electrically coupled to a gate of the first transistor, a source electrically coupled to ground, and a drain for electrical connection to a first group of light emitting elements. The circuit also includes circuitry to provide a predetermined voltage at the source of the first transistor, circuitry to compensate for a difference in respective gate-source voltages of the first and second transistors, and circuitry to compensate for a difference in respective drain-source voltages of the first and second transistors. In some implementations, the circuit can achieve relatively low power consumption. | 04-18-2013 |
20130093339 | DRIVING CIRCUITS FOR LIGHT EMITTING ELEMENTS - A circuit for driving light emitting elements, such as LEDs, includes .a first transistor having a source coupled to ground through a first resistive element, and a second transistor having a gate electrically coupled to a gate of the first transistor, a source electrically coupled to ground, and a drain for electrical connection to a first group of light emitting elements. The circuit also includes circuitry to provide a predetermined voltage at the source of the first transistor, circuitry to compensate for a difference in respective gate-source voltages of the first and second transistors, and circuitry to compensate for a difference in respective drain-source voltages of the first and second. transistors. In some implementations, the circuit can achieve relatively low power consumption. | 04-18-2013 |
20130099687 | AC LED DRIVE CIRCUIT - The present patent application discloses an AC LED drive circuit, comprising four rectifier diodes, a current constant diode and k groups of LED units in parallel; four rectifier diodes constitute a full bridge rectifier circuit; inputs of the bridge rectifiers are AC1 and AC2; the outputs of the bridge rectifiers are a circuit including n series connections by k parallel connections and then serially connected with a current constant diode. The present patent application employs four rectifier diodes and a current constant diode to drive the AC LED drive circuit of the LED so as to make the availability of LED up to 100%, thus improving the light efficiency and reducing the cost. | 04-25-2013 |
20130127351 | DRIVING CIRCUIT AND LED BACKLIGHT MODULE USING THE SAME - A driving circuit for a LED backlight module includes a brightness adjusting module, a current detector, a reference voltage adjusting module, and a comparing module. The current detector is capable of detecting the current of the brightness adjusting module and outputting a detecting result. The reference voltage adjusting module is capable of choosing the corresponding reference voltage corresponding to the detecting result of the current detector. Thus, the reference voltage outputted to the comparing module can be adjusted according to the change of the current of the brightness adjusting module. This reduces the power consumption and the amount of heat generated due to the power consumption, and improves the performance of the LED backlight module. | 05-23-2013 |
20130127352 | HIGH-VOLTAGE AC LED STRUCTURE - The present invention provides a high-voltage alternating current light-emitting diode (AC LED) structure. The high-voltage AC LED structure includes a circuit substrate and a plurality of AC LED chips. The AC LED chips each include an insulated substrate, an LED set, a first metal layer and a second metal layer. The AC LED chips manufactured by a wafer level process are coupled to the low-cost circuit substrate to produce the downsized high-voltage AC LED structure. | 05-23-2013 |
20130147375 | Serial Lighting Interface With Embedded Feedback - A system for controlling multiple strings of LEDs includes a group of LED driver ICs, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings. | 06-13-2013 |
20130154489 | Lighting Apparatus And Light Emitting Diode Device Thereof - A lighting emitting diode (LED) device includes a first adjust module and a second adjust module. The first adjust module includes at least one first LED and has a first internal impedance having a first characteristic curve. A range covered by the first characteristic curve includes a first incomplete conduction region and a first conduction region. As the current increases from zero value and up, the first internal impedance decreases exponentially in the first incomplete conduction region, is approximately linear in the first conduction region. The second adjust module includes an impedance-providing component and an electronic component coupled in series. The second adjust module is coupled in parallel with the first adjust module. The second adjust module has a second internal impedance having a second characteristic curve. The first characteristic curve and the second characteristic curve match one another. | 06-20-2013 |
20130162152 | CIRCUITRY TO DRIVE PARALLEL LOADS SEQUENTIALLY - In one aspect, a circuit includes a plurality of comparators. Each comparator is configured to receive a first input from a corresponding load of a plurality of loads and to receive a second input as a regulation voltage. The circuit also includes an amplifier configured to receive signals provided by the plurality of comparators, a pulse-width modulation (PWM) circuit configured to receive a control signal from the amplifier and to provide a signal to a primary switch to control voltage provided to the loads and an output switch sequencer coupled to each of the comparators and configured to provide control signals to control switches coupled to the primary switch enabling one control switch to be active at a time. Each control switch provides a voltage increase to a respective load of the plurality of loads if enabled. | 06-27-2013 |
20130169174 | LIGHT EMITTING DEVICE FOR AC POWER OPERATION - Disclosed is an improved light-emitting device for an AC power operation. An AC light-emitting device according to the present invention employs a variety of means by which light emission time is prolonged during a ½ cycle in response to a phase change of an AC power source and a flicker effect can be reduced. For example, the means may be switching blocks respectively connected to nodes between the light emitting cells, switching blocks connected to a plurality of arrays, or a delay phosphor. Further, there is provided an AC light-emitting device, wherein a plurality of arrays having the different numbers of light emitting cells are employed to increase light emission time and to reduce a flicker effect. | 07-04-2013 |
20130175935 | APPARATUS AND METHOD FOR COMPENSATING CURRENT DEVIATION - An apparatus and method for compensating for a current deviation are provided. A current is applied through a light emitting diode (LED) array to which LEDs are connected. A current deviation is compensated among each respective string of the LED array using at least one constant current circuit connected to each of the respective strings. | 07-11-2013 |
20130181621 | RECONFIGURABLE LED ARRAYS AND LIGHTING FIXTURES - An optimum LED lighting fixture and regulation method are disclosed for reconfigurable LED arrays used for general illumination applications in AC utility power systems. The method describes a double reconfiguration scheme of a plurality of LED arrays connected in parallel, and where each array comprises some LED pairs formed with two branches of LED lamps capable of changing their interconnection. The first reconfiguration comprises changing the interconnection of the LED pairs to either parallel or series, and the second, comprises changing the number of active LED arrays within the plurality. The method comprises changing the number of active LED arrays as a way of having the magnitude of the current through said plurality to follow the magnitude of the applied voltage. The performance deficiencies of the prior arts are overcome by proposing and LED lighting fixture with higher energy efficiencies, higher power ratings, and lower harmonics generation. In addition, the simplicity of the concept allows for high degree of integrations that can make practical the implementation of driverless LED lighting fixtures. | 07-18-2013 |
20130187556 | Long Decay Phosphors for Lighting Applications - A photoluminescent material has the characteristic of a long photoluminescence decay and has the general composition Ca | 07-25-2013 |
20130193862 | LIGHT-EMITTING APPARATUS AND METHOD OF MANUFACTURING LIGHT-EMITTING APPARATUS - Provided is a light-emitting apparatus, wherein a plurality of light-emitting elements that emit the same type of color are arranged in a plurality of row directions and column directions, the plurality of light-emitting elements arranged in the row direction are connected in series in the row direction, and the rows having the plurality of light-emitting elements connected in series are connected in parallel. The plurality of light-emitting elements comprise first light-emitting elements, and second light-emitting elements having smaller outputs than the first light-emitting elements, and the first light-emitting elements and the second light-emitting elements are arranged alternately in each of the row directions. | 08-01-2013 |
20130207559 | LINEAR BYPASS ELECTRICAL CIRCUIT FOR DRIVING LED STRINGS - An electrical circuit is described that comprises a first string and second LED string coupled in parallel, a first and second transistor, at least one bypass transistor, and a controller. The first transistor is coupled to the first LED string at a first terminal of the first transistor. The second LED string includes multiple LED color strings coupled in series. The second transistor is coupled to the second LED string at a first terminal of the second transistor. The bypass transistor is coupled to one of the color strings. A first terminal of the bypass transistor is coupled to a first terminal of the color string. The second terminal of the bypass transistor is coupled to a second terminal of the color string. The controller controls a gate voltage of the first and second transistors and the bypass transistor to operate all transistors in linear modes. | 08-15-2013 |
20130207560 | MULTI-OUTPUT CURRENT-BALANCING CIRCUIT - The present invention relates to a multi-output current-balancing circuit, which in one embodiment can include: (i) a transformer having a primary winding and a plurality of secondary windings, where the primary winding receives an AC input current; (ii) a plurality of first and second rectifier circuits and a plurality of first current balancing components, where each of the first and second rectifier circuits and the first current balancing components is coupled to a corresponding secondary winding, where each the first current balancing component is configured for current balancing between each of the first and second rectifier circuits of the corresponding secondary winding; and (iii) at least one second current balancing component, where each second current balancing component is coupled to a pair of the second rectifier circuits that correspond to different secondary windings, where the second current balancing components are configured for current balancing between different the secondary windings. | 08-15-2013 |
20130214691 | Encapsulated light-emitting diode lamp - An overmolded light-emitting diode (LED) lamp for a decorative light string. The lamp includes a light-emitting diode, a first lead electrically connected to the light-emitting diode at a top portion of the first lead, a second lead electrically connected to the first lead through the LED, a lens encapsulating the light-emitting diode, a top portion of the first lead, and a top portion of the second lead, and a housing having a solid uniform body encapsulating a bottom portion of the lens, a portion of the first lead, and a portion of the second lead, such that bottom portions of the first lead and the second lead extend outward and away from a bottom portion of the housing. | 08-22-2013 |
20130234611 | LIGHT EMITTING DEVICE - Light emitting devices. A light emitting device including a power source; and a plurality of light emitting diode (LED) arrays coupled to the power source unit; and at least one delay unit. Each delay unit is coupled to a corresponding light emitting diode array of the light emitting diode arrays. | 09-12-2013 |
20130249420 | LED DRIVING SYSTEM AND METHOD - A light emitting diode (LED) driving system includes a sampling circuit, a control circuit, a PWM controller circuit, a DC/DC converter and a current balance circuit. The sampling circuit detects voltage of cathodes of LED strings of a LED array. The control circuit generates and outputs a control signal according to the minimum voltage of the cathodes of rest LED strings except LED string with the minimum cathode voltage, if the minimum voltage is in an expected voltage range and a difference between the maximum voltage of the cathodes of the LED strings and the minimum voltage of the cathodes of the LED strings is greater than a threshold. The PWM controller circuit generates and outputs PWM signals according to the control signal, to control the DC/DC converter generate and output suitable direct current voltage to drive the LED array. The current balance circuit comprises a plurality of switches. | 09-26-2013 |
20130264956 | LED DRIVER CAPABLE OF CONTROLLING COLOR/COLOR TEMPERATURE WITH A POWER CARRIER - An LED driver capable of controlling color/color temperature with a power carrier connects a power switch with a dimmer for linking an input end of an LED color/color temperature output controller. An LED array disposed on an output end of the controller allows a power cord to transmit a controlling signal. A synchronous and dimmer action detection differentiates an action of the dimmer or pressing times from an ON/OFF count, so that the LED array presents different color temperatures/colors accordingly. An LED condition memory saves the color temperature/color according to an output signal. In adjusting illumination, the dimmer changes an output current for altering the power of the LED array accordingly, which presents a stable light but avoids deviating the color temperature/color and flickering. | 10-10-2013 |
20130264957 | NON-RECTANGULAR PIXEL ARRAY AND DISPLAY DEVICE HAVING SAME - A non-rectangular pixel array includes non-rectangular pixels. A first conductor line group including first conductor lines and a second conductor line group including second conductor lines are arranged to intersect. Each non-rectangular pixel is arranged to be partially surrounded by one of the first conductor lines and one of second conductor lines. Each first conductor lines includes a first line and a second line which are arranged in parallel and in proximity to each other, without non-rectangular pixel existing between the first line and the second line within each first conductor line, and with non-rectangular pixels existing between adjacent the first conductor lines. Non-rectangular pixels include first pixels and second pixels. Each first pixel is arranged to be partially surrounded by the first line and the second conductor line, and each second pixel is arranged to be partially surrounded by the second line and the second conductor line. | 10-10-2013 |
20130271018 | Color Correlated Temperature Correction for LED Strings - An array of LEDs having output light in different wavelength ranges. A control circuit connected to the array includes a temperature variable resistance component and a switch selectively connecting the component to the array. The control circuit limits the current applied to at least some of the LEDs during initial energization of the LEDs prior to steady-state operation of the LEDs. Variations over time of a color correlated temperature (CCT) of output light of the energized array are reduced. | 10-17-2013 |
20130271019 | LED DRIVING SYSTEM AND METHOD - An exemplary light emitting diode (LED) driving system includes a direct current/direct current (DC/DC) converter, a detection circuit, a control circuit, a pulse width modulation (PWM) controller, and a current balance circuit. The DC/DC converter outputs a suitable direct current voltage to drive an LED array. The detection circuit detects cathode voltages of LED strings of the LED array. The control circuit generates and outputs a control signal to the PWM controller, and generates and outputs various adjusting signals. The current balance circuit adjusts current flowing through two of the LED strings, which have a minimum and a maximum detected cathode voltage, respectively. The current balance circuit includes switches. A related LED driving method is also provided. | 10-17-2013 |
20130271020 | POWER SUPPLY - A power supply is provided. The power supply includes a plurality of light emission units, a power source, a plurality of boards, a plurality of board resistors, and a feedback control unit. The light emission units are connected in parallel, and include a plurality of LEDs. The power source supplies a DC voltage to the light emission units. The boards have at least one light emission mounted thereon. The board resistors are disposed in each of the boards, and electrically connected to each other. The feedback control unit varies a current supplied from the power source, according to sum of the board resistors which are changed according to the number of connected boards. | 10-17-2013 |
20130278158 | OLED LIGHTING MODULE - An OLED lighting apparatus includes: an OLED light panel; a first electrode; a second electrode; and at least one resistor connected between the OLED light panel and at least one of the first and second electrodes; first sets of terminals on opposite sides of the module connected to the first and second electrodes; and second sets of terminals on opposite sides of the module, wherein the lighting circuit is connected in series between the first sets of terminals. | 10-24-2013 |
20130285566 | LIGHT EMITTING DIODE DRIVING APPARATUS - There is provided a light emitting diode (LED) driving apparatus capable of simplifying a peripheral circuit and reducing manufacturing costs by driving two LED channels by a single field effect transistor (FET). The light emitting diode driving apparatus includes: a power supplying unit switching input power according to a control and including a transformer transforming the switched power into a preset driving power to supply the driving power; a light emitting diode unit including at least one light emitting diode group including first and second light emitting diode arrays each having at least one light emitting diode, the first and second light emitting diode arrays being connected to an output terminal of the transformer to form a single loop and receiving the driving power to emit light; and a controlling unit controlling power switching of the power supplying unit. | 10-31-2013 |
20130285567 | Light-Emitting Device and Luminaire - According to one embodiment, a light-emitting device includes a light source section including a plurality of series circuits, in each of which a plurality of light-emitting elements are connected in series, the plurality of series circuits being connected in parallel, and a substrate on which the light-emitting elements of the light source section are mounted. The light-emitting elements of the series circuits different from one another are mounted adjacent to one another. | 10-31-2013 |
20130293127 | METHOD OF FORMING AN LED CONTROL CIRCUIT AND STRUCTURE THEREFOR - In one embodiment, an LED control circuit is configured to form an LED current for operating an LED light source and configured to form a bias current for a dummy load. The LED control circuit is configured to terminate the bias current responsively to detecting the LED current. | 11-07-2013 |
20130313985 | METHOD OF DRIVING A LIGHT SOURCE, LIGHT SOURCE APPARATUS FOR PERFORMING THE METHOD AND DISPLAY APPARATUS HAVING THE LIGHT SOURCE APPARATUS - A method of driving a light source includes outputting a variable driving voltage to a light source part, sensing a first voltage based on the driving voltage and developed at a first end of the light source part, sensing a second voltage developed at a second end of the light source part due to current passing through the light source part and adjusting the driving voltage while using the first and second voltages so that power consumption by the light source part is substantially constant irrespective of temperature of the light source part and/or irrespective of a duty cycle ration being used to drive the light source part. Thus, a luminance of the light source part may be maintained at substantially uniform levels. | 11-28-2013 |
20130313986 | LIGHT EMITTING APPARATUS - A light emitting apparatus includes a power supply providing power having a predetermined frequency, a plurality of light emitting diode arrays, and at least one frequency converter. The light emitting diode arrays are electrically connected to the power supply and respectively have an array structure in which at least one or more light emitting diodes are connected to one another in series. The at least one frequency converter is connected to both ends of the power supply, and configured to modulate a frequency of the power provided from the power supply and provide a modulated electrical signal to at least one of the plurality of light emitting diode arrays. | 11-28-2013 |
20130320870 | LIGHT-EMITTING MODULE AND LUMINAIRE - A light-emitting module includes a first light-emitting element group which includes first light-emitting elements and in which the plural first light-emitting elements are connected in series. Besides, the light-emitting module includes a second light-emitting element group which includes second light-emitting elements whose rate of change of light-emitting efficiency and rate of change of voltage with respect to a temperature change are large as compared with the first light-emitting elements, in which the plural second light-emitting elements are connected in series, and which is connected in parallel to the first light-emitting element group. | 12-05-2013 |
20130342118 | LED Backlight Driving Circuit, LCD Device, and Manufacturing Method - The invention provides an LED backlight driving circuit, an LCD device, and a manufacturing method. The LED backlight driving circuit includes at least two lightbars arranged in parallel connection; at least one LED lightbar is in series connection with a divider resistor(s) used for balancing the voltage difference between the LED lightbars. In the invention, because the LED lightbar(s) is in series connection with the divider resistors used for balancing the voltage difference between the LED lightbars, the divider resistors with different resistance can be connected in series according to different resistance of all the LED lightbars during design, to enable the total voltage difference of each LED lightbar and the divider resistor to be equal; thus, the voltages of all the pins of the IC coupled into the drive converter can be consistent, and no additional current can be generated in the IC because no voltage differences exist between pins basically; thus, the power consumption of the IC is reduced, and the heat productivity of the IC is reduced, thereby reducing the temperature of the IC. | 12-26-2013 |
20140009075 | Backlight Control Circuit with Under Current Detection and Start-up Control - The present invention discloses a backlight control circuit, comprising: a voltage supply circuit for receiving an input voltage and generating an output voltage under control by a control signal; at least one voltage comparison path respectively coupled to at least one light emission device path; a voltage operative amplifier circuit for generating the control signal according to a lowest voltage on the at least one voltage comparison path; and at least one under current detection circuit for detecting whether a corresponding one of the at least one light emission device path is in an under current status, whereby when anyone of the under current detection circuits detects the under current status, it sends an exclusion signal excluding a corresponding one of the at least one voltage comparison path from being an effective input of the voltage operative amplifier. | 01-09-2014 |
20140042920 | COLOR TEMPERATURE ADJUSTABLE LED LAMP - A color temperature adjustable LED lamp is disclosed, which includes a 3-way lamp socket and a 3-way lamp head. The 3-way lamp socket has a 3-way switch. The 3-way lamp head is connected to the 3-way lamp socket and has a first LED array and a second LED array. The color temperature of the first LED array is different from the color temperature of the second LED array. The color temperature adjustable LED lamp includes a mains detecting circuit for detecting a conducting state of a first live wire and a second live wire in the 3-way switch to selectively operate the first LED array, the second LED array or alternatively operates the first and second LED array. | 02-13-2014 |
20140049172 | LED Dimming Module - The present invention proposes an LED dimming module ( | 02-20-2014 |
20140055048 | SEMICONDUCTOR LIGHT-EMITTING DEVICE - A semiconductor light-emitting device includes at least one light-emitting chip. The light-emitting chip includes plural light-emitting units, which are electrically coupled to each other in series, in parallel or in series-parallel combination; a first-type electrode electrically coupled to an external power source, the first-type electrode being disposed on one of the light-emitting units; a second-type electrode disposed on another of the light-emitting units; and a tapped point for electrically coupling at least one of the light-emitting units to an electronic component. | 02-27-2014 |
20140055049 | ILLUMINATING DEVICE - An illuminating device includes at least one light-emitting source. The light-emitting source includes a substrate; at least one light-emitting chip disposed on the substrate; and at least one constant-current component electrically coupled to the light-emitting chip. The light-emitting chip includes multiple light-emitting units that are electrically coupled in series, in parallel, or in series-parallel; a first-type electrode, disposed on at least one of the light-emitting units, for electrically coupling to a central DC power source; a second-type electrode disposed on at least one light-emitting unit different from the one, on which the first-type electrode is disposed; and a tapped point configured for electrically coupling at least one of the light-emitting units to the constant-current component. | 02-27-2014 |
20140062321 | SELF-IDENTIFYING SOLID-STATE TRANSDUCER MODULES AND ASSOCIATED SYSTEMS AND METHODS - Self-identifying solid-state transducer (SST) modules and associated systems and methods are disclosed herein. In several embodiments, for example, an SST system can include a driver and at least one SST module electrically coupled to the driver. Each SST module can include an SST and a sense resistor. The sense resistors of each SST module can have at least substantially similar resistance values. The SSTs of the SST modules can be coupled in parallel across an SST channel to the driver, and the sense resistors of the SST modules can be coupled in parallel across a sense channel to the driver. The driver can be configured to measure a sense resistance across the sense resistors and deliver a current across the SSTs based on the sense resistance. | 03-06-2014 |
20140077710 | LED LAMP STRUCTURE DRIVEN BY DOUBLE CURRENT AND DOUBLE CURRENT DRIVING METHOD THEREOF - Disclosed are an LED lamp structure driven by double current and a double current driving method thereof. The LED lamp structure driven by double current includes a COB package, a temperature sensor, and a controller. The COB package is provided therein with a blue LED chipset to be driven by a first current and a red LED chipset to be driven by a second current. The temperature sensor detects the working temperature of the red LED chipset, and the controller performs dynamic adjustment on the second current according to the working temperature so as to stabilize the color temperature of the LED lamp structure. Thus, as soon as the LED lamp structure is activated, its color temperature will be stabilized to ensure user comfort, which may otherwise be disturbed by variation of the color temperature. | 03-20-2014 |
20140091721 | LED Device with Voltage-Limiting Unit and Voltage-Equalizing Resistance - The present invention provides a LED device with voltage-limiting unit and voltage-equalizing resistance in which a light-emitting unit is structured through a LED being connected in parallel with a voltage-limiting unit in the same polarity, and two ends thereof being further connected in parallel with an voltage-equalizing resistance, so that when plural sets of the light-emitting units are connected in series or in series-parallel in the same polarity, the end voltage of each set is stabilized by the voltage-equalizing resistance connected in parallel with the two ends of the LED and the voltage-limiting unit. | 04-03-2014 |
20140097760 | DISPLAY APPARATUS AND METHOD OF EVALUATING VISIBILITY THEREOF - A method of evaluating visibility of a plurality of sub-pixel structures in a panel having a plurality of red sub-pixels, green sub-pixels, and blue sub-pixels arranged in stripes, the method including establishing a target sub-pixel structure different from the stripe sub-pixel structure of the panel by combining the plurality of pixels, and evaluating a displayed image by using the target sub-pixel structure. | 04-10-2014 |
20140097761 | SOLID STATE LIGHTING DEVICE AND DRIVER CONFIGURED FOR FAILURE DETECTION AND RECOVERY - Systems and method for detecting failure in solid state light sources and recovering from the failure are provided. A light engine including a controller circuit and strings of solid state light sources emits light in response to drive current provided by a driver circuit. The controller circuit monitors an output voltage of the driver circuit, and detects a failure of one of the solid state light sources. The failure is associated with a change in the output voltage of the driver circuit. The controller circuit then transmits a first signal to the driver circuit in response to detecting a failure, and the driver circuit is configured to decrease the drive current in response to the first signal. | 04-10-2014 |
20140097762 | LIGHT EMITTING ELEMENT DRIVE CIRCUIT - An LED drive circuit ( | 04-10-2014 |
20140103824 | LAMP - A lamp includes a lamp tube, a carrier, a light bar circuit board, a driver circuit board, a plurality of first luminous elements and a parallel-connected type luminous unit. The carrier is accommodated in the lamp tube. The light bar circuit board is disposed on the carrier. The driver circuit board is disposed on the carrier and adjoins the light bar circuit board. The first luminous elements are disposed on the light bar circuit board. The parallel-connected type luminous unit is disposed on the driver circuit board, and includes a plurality of luminous element groups connected in parallel. | 04-17-2014 |
20140132165 | Light Emitting Device Array Billboard and Row Switch Circuit and Control Method Thereof - The present invention discloses a light emitting device array billboard and a row switch circuit and a control method thereof. The light emitting device array billboard includes a light emitting device array circuit, plural row switch circuits, plural column driver circuits, and a control circuit. The light emitting device array circuit includes plural light emitting devices arranged by columns and rows. Each row switch circuit determines whether to electrically connect a row conduction voltage to the corresponding row node or to discharge charges at the corresponding row node through a discharging path according to a row selection signal. Each column driver circuit determines whether or not to electrically connect a column conduction voltage to the corresponding column node according to a column selection signal. The control circuit provides the row selection signal and the column selection signal to the row switch circuits and the column driver circuits. | 05-15-2014 |
20140145630 | LED LIGHT STRING COLOR MIXING AND SYNCHRONIZATION CIRCUIT - The present invention provides an LED light string color mixing and synchronization circuit, in which each of LED lights composed of an LED light string includes two input terminals and two output terminals. The two input terminals are respectively an input terminal of reverse parallel connection of any two of three primary light-emitting chips of R, G, B and an anode input terminal of the remaining primary light-emitting chip and the two output terminals are respectively an output terminal of reverse parallel connection of any two of three primary light-emitting chips of R, B and a cathode output terminal of the remaining primary light-emitting chip. Thus, each of the LED lights of the LED light string is connected in a two-input two-output series connection to form a light string arrangement with two terminals thereof in combination with four electrical wires. | 05-29-2014 |
20140145631 | BACKLIGHT DRIVER CIRCUIT AND LIQUID CRYSTAL DISPLAY DEVICE - The present invention provides a backlight driver circuit, which includes a plurality of LED strips connected in parallel, the input end of each of the LED strips being coupled to a DC power source; a detection module, coupled to the plurality of LED strips for detecting an output current of each LED strip; a reference current generation module, for providing a reference current; and an impedance adjustment module, based on a detection result of the detection module, through adjusting impedance, for adjusting the output current on each LED strip to the same level as the reference current generated by the reference current generation module. Correspondingly, the present invention provides a liquid crystal display device using the above backlight driver circuit. As such, present invention can maintain the current running through each LED strip at the same level and reduce the cost of backlight driver circuit. | 05-29-2014 |
20140152185 | LIMITED FLICKER LIGHT EMITTING DIODE STRING - A limited flicker decorative light-emitting diode (LED) string includes a power plug adapted to connect to an alternating current (AC) power source and supply AC power to the LED string, a first pair of LEDs and a second pair of LEDs, a plurality of LEDs electrically connected in series to form an LED series, and a plurality of rectifying diodes. The plurality of rectifying diodes provides full-wave rectification of the AC power to the LED series and half-wave rectification of the AC power to the first and second pair of LEDs. | 06-05-2014 |
20140159594 | LIGHT SOURCE DEVICE WITH LIGHT-EMITTING DIODE MODULE - A light source device with an LED module includes a load module. The load module includes a voltage-regulating unit and a constant current controlling unit parallel-connected between a first output end and a second output end of the voltage-regulating unit. An input end of the voltage-regulating unit is connected to a positive end of a voltage source. The voltage-regulating unit generates a stable voltage difference of less than 1.6V between the first and second output ends. The LED module receives a residual voltage equal to the result of subtracting from the output voltage of the voltage source the voltage difference consumed by the load module. The amount by which the residual voltage exceeds the operating voltage required for the entire LED string never exceeds safe voltage values. Even if a voltage source changes, the voltage-regulating unit can still generate a stable voltage difference and a stable current. | 06-12-2014 |
20140159595 | CURRENT BALANCING CIRCUITS FOR LIGHT-EMITTING-DIODE-BASED ILLUMINATION SYSTEMS - A system includes first, second, and third sets of LEDs and a control module. The first set of LEDs outputs light having wavelengths in a wavelength range in a spectrum of ultraviolet light and is coated with a phosphor to convert the ultraviolet light to blue light having wavelengths in a wavelength range in a spectrum of blue light. The second and third sets of LEDs output light having wavelengths in a wavelength range in the spectrum of blue light and is coated with phosphors to convert the blue light to light having wavelengths in a wavelength range in a spectrum of green, yellow, and red light. The second set of LEDs generates less red light than green light. The third set of LEDs generates less green light than red light. The current control module controls currents through the first, second, and third sets of LEDs to generate white light. | 06-12-2014 |
20140159596 | PHOSPHOR AND LED PLACEMENT FOR WHITE LED-BASED LAMPS - A system including a base portion, which includes first and second sets of light emitting diodes (LEDs) to emit blue light having first and second wavelengths in first and second wavelength ranges in a spectrum of blue light, a glass layer arranged at a second predetermined distance from the base portion, and a plurality of coatings of first and second phosphors having a predetermined length arranged in an alternating pattern on a surface of the glass layer facing toward the LEDs. The LEDs of the first and second sets are arranged on the base portion in an alternating pattern and are separated from each other by a first predetermined distance. Centers of the coatings of the first and second phosphors respectively align with centers of corresponding LEDs in the first and second sets. | 06-12-2014 |
20140167631 | Circuit and Method for Detecting the Duration of the Interruption of a Mains Input - A power supply or driver circuit configured to provide electrical energy at a drive voltage. The driver circuit converts electrical energy at an input voltage to the electrical energy at the drive voltage. A controller is configured to control the power converter to provide electrical energy at the drive voltage. The controller stops operation at an interruption of electrical energy to the driver circuit. The controller is configured to resume operation subsequent restoration of electrical energy to the driver circuit. The controller is configured to maintain the timing voltage above a first voltage level when the controller is in operation and to determine the duration of an interruption of electrical energy to the driver circuit. | 06-19-2014 |
20140167632 | LIGHT SOURCE COMPRISING A LED STRIP - A LED light source comprising a LED strip supplied by a switch mode power supply is disclosed. The LED light source has a low power dissipation and is to a large extent independent of the magnitude of the DC voltage supplying the switch mode power supply. The LED light source allows arbitrary positioning of a light or a presence detector. | 06-19-2014 |
20140191673 | LED DRIVING CIRCUIT HAVING Vcc STABILIZATION CIRCUIT - An LED driving circuit includes: a bridge rectification circuit configured to receive an AC voltage and perform full-wave rectification on the AC voltage, the bridge rectification circuit including a first LED block, a second LED block, a third LED block, and a fourth LED block each including n LEDs (where n is a positive integer equal to or greater than one); a constant current IC configured to constantly limit a current flowing through the bridge rectification circuit; and a Vcc stabilization circuit connected between the constant current IC and a driving voltage supply node positioned between LEDs constituting one of the first to fourth LED blocks, and configured to stabilize a voltage applied through the bridge rectification circuit and provide the constant current IC with a stabilized driving voltage. | 07-10-2014 |
20140191674 | DIMMABLE LED LIGHT FIXTURE HAVING ADJUSTABLE COLOR TEMPERATURE - Electronic circuitry for color-mixing in an LED light fixture during AC power dimming is disclosed to achieve adjustable color temperature. According to one embodiment, a dimmable LED light fixture has first, second, and third LED light sources, the first and second LED light sources producing white light, the third LED light source producing colored light, the LED driver configured to power the LED light sources by providing a single-channel variable-DC current source having two output terminals, and a current regulator for maintaining the current in the third LED light source path substantially constant as the LED driver output current is decreased when the AC power is reduced by the dimmer module, thereby altering the color of the light produced by the combination of the LED light sources. | 07-10-2014 |
20140197750 | SYSTEMS AND METHODS FOR CONTROLLING SOLID STATE LIGHTING DURING DIMMING AND LIGHTING APPARATUS INCORPORATING SUCH SYSTEMS AND/OR METHODS - A lighting apparatus having a plurality of light-emitting devices (LEDs) can include at least one first LED that is configured to emit first chromaticity light, at least one second LED that is configured to emit second chromaticity light, and at least one additional LED that is configured to emit third chromaticity light. A control circuit can be operatively coupled to the plurality of light-emitting devices and configured to cause a color temperature produced by the plurality of LEDs to vary substantially in conformance with a Planckian locus in response to a dimming control input less than about 1800K. | 07-17-2014 |
20140197751 | Spectral Shift Control for Dimmable AC LED Lighting - Apparatus and associated methods involve operation of an LED light engine in which a relative intensities of selected wavelengths shift as a function of electrical excitation. In an illustrative example, current may be selectively and automatically diverted substantially away from at least one of a number of LEDs arranged in a series circuit until the current or its associated periodic excitation voltage reaches a predetermined threshold level. The diversion current may be smoothly reduced in transition as the excitation current or voltage rises substantially above the predetermined threshold level. A color temperature of the light output may be substantially changed as a predetermined function of the excitation voltage. For example, some embodiments may substantially increase or decrease a color temperature output by a solid state light engine in response to dimming the AC voltage excitation (e.g., by phase-cutting or amplitude modulation). | 07-17-2014 |
20140203718 | AC LED LIGHTING APPARATUS USING VOLTAGE EDGE DETECTOR - Exemplary embodiments of the present invention disclose an alternating current (AC) light emitting diode (LED) lighting apparatus including a rectification unit configured to receive an AC voltage and output a DC rectified voltage, an LED unit connected to the rectification unit, the LED unit comprising at least two light emitting groups, each light emitting group comprising at least one LED, and an LED driving control unit connected to the rectification unit, the LED driving control unit configured to establish a series or parallel connection between the light emitting groups, by comparing a voltage level of the rectified voltage with a reference voltage. The LED driving control unit is configured to calculate a reference voltage adjustment value in order to compensate for a signal processing delay of the LED driving control unit. | 07-24-2014 |
20140203719 | MULTI-OUTPUT CURRENT-BALANCING CIRCUIT - The present invention relates to a multi-output current-balancing circuit, which in one embodiment can include: (i) a transformer having a primary winding and a plurality of secondary windings, where the primary winding receives an AC input current; (ii) a plurality of first and second rectifier circuits and a plurality of first current balancing components, where each of the first and second rectifier circuits and the first current balancing components is coupled to a corresponding secondary winding, where each the first current balancing component is configured for current balancing between each of the first and second rectifier circuits of the corresponding secondary winding; and (iii) at least one second current balancing component, where each second current balancing component is coupled to a pair of the second rectifier circuits that correspond to different secondary windings, where the second current balancing components are configured for current balancing between different the secondary windings. | 07-24-2014 |
20140210368 | LED ILLUMINATOR APPARATUS, USING MULTIPLE LUMINESCENT MATERIALS DISPENSED ONTO AN ARRAY OF LEDs, FOR IMPROVED COLOR RENDERING, COLOR MIXING, AND COLOR TEMPERATURE CONTROL - An LED array includes three or more strings of bare LEDs mounted in close proximity to each other on a substrate. The strings of LEDs emit light of one or more wavelengths of blue, indigo and/or violet light, with peak wavelengths that are less than 490 nm. Luminescent materials deposited on each of the LED chips in the array emit light of different wavelength ranges that are of longer wavelengths than and in response to light emissions from the LED chips. A control circuit applies currents to the strings of LEDs, causing the LEDs in the strings to emit light, which causes the luminescent materials to emit light. A user interface enables users to control the currents applied by the control circuit to the strings of LEDs to achieve a Correlated Color Temperature (CCT) value and hue that are desired by users, with CIE chromaticity coordinates that lie on, or near to the black body radiation curve. Preferably a transparent material is dispensed on the substrate between the LED semiconductor chips to substantially surround the LED semiconductor chips. Thereafter at least one layer containing luminescent materials is applied on the LED semiconductor chips and the transparent material. | 07-31-2014 |
20140217909 | APPARATUS FOR DRIVING MULTI-COLOR LED STRINGS - An apparatus comprises red, green and blue LED strings each having a corresponding switching circuit. Each LED string is divided into a plurality of LED segments. The three LED strings are connected in parallel or in series. Each LED string may be connected in series with a respective current source or share a common current source. A controller controls each switching circuit so that the number of LED segments connected in series in the red, green or blue LED string can be respectively controlled according to a color setting signal and the voltage level of an input voltage. A first control method is provided for controlling the apparatus having a constant input voltage and a second control method is provided for controlling the apparatus having a periodically time-varying input voltage. | 08-07-2014 |
20140217910 | AC TO DC LED ILLUMINATION DEVICES, SYSTEMS AND METHODS - Illumination devices ( | 08-07-2014 |
20140232277 | LIGHTING SOURCE AND LIGHTING APPARATUS - An LED module includes: a first LED array which includes a plurality of first LEDs connected in series and through which a first branch current flows; a second LED array which includes a plurality of second LEDs | 08-21-2014 |
20140265893 | HIGH-EFFICIENCY LIGHTING DEVICES HAVING DIMMER AND/OR LOAD CONDITION MEASUREMENT - A circuit for powering high-efficiency lighting devices from a thyristor-controlled dimmer includes a power converter for powering the high-efficiency lighting devices from input terminals of the circuit. The circuit also includes a control circuit that controls the input current drawn by the input terminals at least while the power converter transfers energy to the lighting devices. The circuit also includes a sensing circuit that determines or measures at least one attach current characteristic at the input terminals and stores an indication of the characteristic for subsequent operation of the control circuit. | 09-18-2014 |
20140292213 | AC LED LIGHTING APPARATUS - Embodiments of the invention provide AC LED lighting apparatuses. The AC LED lighting apparatuses may increase luminous flux and provide optimal efficiency through novel arrangement of a plurality of light emitting blocks on a circuit board and a plurality of LEDs and drive ICs included in each of the light emitting blocks to be sequentially driven, and/or through efficient series-parallel connection between a limited number of LEDs. | 10-02-2014 |
20140292214 | Interconnectable LED Module for Use in a Direct Current Circuit - A system and method for interconnecting LED modules that receive electrical energy from a direct current electrical energy power supply includes a first type of mating connector to provide an input of direct current electrical energy to a printed circuit board contained within an interconnectable LED module and a second type of mating connector to provide an output of direct current electrical energy to and interconnecting with another interconnectable LED module. The second type of mating connector attaches to the first type of mating connector in the next LED module in a string of interconnectable LED modules. | 10-02-2014 |
20140292215 | LED Lamp with Remote Control - Various apparatuses and methods are disclosed for a remotely controllable LED lamp. One embodiment of an LED lamp includes at least one LED in each of a plurality of colors, a power supply, and a controller connected to the power supply and the at least one LED in each of a plurality of colors. The controller is adapted to adjust current levels to the at least one LED in each of a plurality of colors to produce a blended color. The controller is also adapted to adjustably vary an intensity of the blended color without substantially changing the blended color. | 10-02-2014 |
20140312792 | BACKLIGHT DRIVING MODULE - A backlight driving module including a power converter module and a processor module is provided. The power converter module is configured to convert a first power to a second power to drive the backlight module according to a driving parameter set. The processor module is configured to provide the first power to the power converter module. One of the processor module and the power converter module determines a configuration of the backlight module by using identification information. The driving parameter set corresponds to the configuration of the backlight module. | 10-23-2014 |
20140333218 | LED LIGHT STRING WITH OPEN CIRCUIT PROTECTION - An LED light string with open circuit protection has a first end for receiving a first voltage, a second end for receiving a second voltage, and multiple LED units connected in series between the first end and the second end. Each of the LED units has multiple LEDs and at least one by-pass resistor connected in parallel. Even when the LEDs of the same LED unit all fail, a current from the first end to the second end can still flow through all the LED units via the by-pass resistors to drive the remaining normal LED units. | 11-13-2014 |
20140333219 | LED LIGHTING UNIT WITH COLOR AND DIMMING CONTROL - Method and apparatus for a LED lighting unit ( | 11-13-2014 |
20140339992 | LED Device with Shared Voltage-Limiting Unit and Individual Equalizing Resistance - The present invention relates to a LED device with shared voltage-limiting unit and individual voltage-equalizing resistance, wherein two ends of a LED set constituted by a plurality of same-polarity series LEDs are in parallel connected with a shared voltage-limiting unit, and two ends of individual LED are respectively in parallel connected with an voltage-equalizing resistance for providing an overvoltage protection to the LEDs. | 11-20-2014 |
20140361697 | COLOR TEMPERATURE CONTROLLED AND LOW THD LED LIGHTING DEVICES AND SYSTEMS AND METHODS OF DRIVING THE SAME - The purposes of the devices described herein are to provide an LED lighting device capable of efficiently and economically emitting light having a selectable color temperature or a warm-on-dim feature when driven with AC power and to provide LED lighting devices which have an improved power factor and a reduced total harmonic distortion when powered with AC power. | 12-11-2014 |
20150008835 | LIGHT-EMITTING DEVICE, AND LIGHT SOURCE FOR LIGHTING AND LIGHTING APPARATUS USING THE SAME - A light-emitting device includes a first light-emitting element and a second light-emitting element. The first light-emitting element has a first LED, and emits a first spectrum. The second light-emitting element has a second LED and a constant voltage element connected in series, and emits a second spectrum different from the first spectrum. The second light-emitting element is connected in parallel to the first light-emitting element. First light-emitting element and the second light-emitting element are configured such that their lines indicating the forward current-forward voltage characteristics cross each other. This enables to change spectral distribution emitted from the light-emitting device just by changing power supplied from a single power circuit. | 01-08-2015 |
20150008836 | LED FLUORESCENT LAMP DRIVING DEVICE DRIVEN BY BEING CONNECTED TO LAMP STABILIZER AND LED FLUORESCENT LAMP HAVING THE DRIVING DEVICE INSTALLED THEREIN - Recently, there has been a growing emphasis on the importance of green industries for reducing energy consumption. As part of the reduction in energy consumption, LED lamps have been widely distributed and used, but conventional fluorescent lamps made of glass tubes have not been actively replaced with LED fluorescent lamps because the replacement of conventional fluorescent lamps is too difficult, for instance, in order to replace the conventional fluorescent lamps with LED fluorescent lamps, a conventional fluorescent lamp stabilizer provided within the light of the fluorescent lamp has to be removed and an LED converter must be installed again. The LED fluorescent lamp of the present invention is driven by continually using an alternating current power source outputted from a fluorescent lamp stabilizer, and thus the installation of the LED fluorescent lamp can be completed by replacing only a fluorescent lamp made of glass tubes with the fluorescent lamp of the present invention while the conventional light of the fluorescent lamp including the fluorescent lamp stabilizer is used. Furthermore, the LED florescent lamp of the present invention provides the advantage of allowing power consumption to be constant even though an inputted alternating current voltage is considerably increased up to AC 250-260V. | 01-08-2015 |
20150015149 | LED Control Method and Apparatus - An LED control circuit designed for providing stable voltage to LED loads, which is comprised of a bridge rectifier connected with the power supply, at least one LED branch circuit comprised of LED control units in series connection with a current-regulating element. Each LED control unit is comprised of a zener diode parallelly connected with LED working elements made of an LED and a serially connected current limiting resistor. The forward voltage drop of the zener diode closely approximates the desired working voltage of the LED loads, and thus each LED control unit plays the role of a voltage regulator. When voltage of an LED control unit is below the stabilized voltage of the zener diode, the brightness of LED is continuously adjustable. When an LED branch circuit is put under the control of a constant current control module, the current flowing through each LED can be stabilized. | 01-15-2015 |
20150022103 | LIGHT EMITTING DIODE DRIVING APPARATUS AND LIGHT EMITTING DIODE DRIVING METHOD - A light emitting diode (LED) driving apparatus and an LED driving method suitable for driving an LED load are provided. The LED driving apparatus includes a driving circuit, a feedback circuit, and a control chip. The driving circuit provides a driving voltage to one terminal of the LED load according to a pulse-width modulation (PWM) driving signal. The feedback circuit generates a feedback voltage according to a voltage on the other terminal of the LED load. The control chip is configured to generate the PWM driving signal and adjust the duty cycle of the PWM driving signal in response to the feedback voltage. If the control chip determines the PWM driving signal with a threshold duty cycle continues being output over a preset period of time, the control chip determines that the current leakage phenomenon occurs on the LED load and stops generating the PWM driving signal. | 01-22-2015 |
20150028755 | LIGHT EMITTING DIODE ILLUMINATION DEVICE - An LED illumination device includes an LED package and a switch electrically connecting the LED package. The LED package includes a first lamp group and a second lamp group installed in parallel. A direction of the current of the first lamp group is inverted to that of the second lamp group. Different contact parts of the switch respectively connect a power source to make the first lamp group and the second lamp group on or off respectively. | 01-29-2015 |
20150035443 | LIGHTING APPARATUS FOR USE WITH CONTROLLED CURRENT DRIVERS - An apparatus includes a bus configured to be coupled to a controlled current source and at least one light emitting device coupled to the bus. The apparatus further includes a voltage regulator circuit configured to regulate a voltage at the bus and a current regulator circuit configured to control a current through the at least one light emitting device. The current regulator circuit may be used to control a color output of the apparatus. | 02-05-2015 |
20150035444 | LED LIGHTING DEVICE - A control circuit performs ON/OFF control for a switching element so that LED current flowing in an LED unit is within a rated current range. In the case where the LED unit is lit, a voltage applied between both ends of series connection of a reactor and the LED unit becomes a first bus voltage, when the switching element is ON, and becomes a voltage lower than the first bus voltage, that is determined based on the first bus voltage and a second bus voltage, when a switching element is OFF. | 02-05-2015 |
20150042233 | LED Backlight Driving Circuit and LCD - The present invention proposes an LED backlight driving circuit comprises voltage booster circuits parallelly connected and a constant current driving IC module. The voltage booster circuits are used for conversing an input voltage into a needed output voltage to supply to an LED unit. The constant current driving IC module is used for controlling the voltage booster circuits, so that the voltage booster circuits converse the input voltage into the needed output voltage to supply to the LED unit, driving the LED unit in a constant current. The constant current driving IC module generates driving signals at different frequencies to control the voltage booster circuits respectively. The invention can set up multiple driving signals operating simultaneously at different frequencies respectively and disperse resulting harmonic wave, hence reduce EMI signals of the backlight driving circuit effectively. The present invention also proposes an LCD using the LED backlight driving circuit. | 02-12-2015 |
20150048747 | STRUCTURE OF COLOR MIXING CIRCUIT OF LED LIGHT STRING - Disclosed is a structure of a color mixing circuit of an LED light. The LED light includes two input pins that are respectively an input pin of two light emitting chips of four primary color light emitting chips of R, G, B, and Y that are connected in parallel and opposite in direction and an input pin of the remaining two light emitting chips that are connected in parallel and opposite in direction; and two output pins that are respectively an output pin of the two light emitting chips of the four primary color light emitting chips of R, G, B, and Y that correspond to one of the input pins and are connected in parallel and opposite in direction and an output pin of the remaining two light emitting chips that correspond to another one of the input pins and are connected in parallel and opposite in direction. | 02-19-2015 |
20150048748 | STRUCTURE OF COLOR MIXTURE SYNCHRONIZATION CIRCUIT OF LED LIGHT STRING - Disclosed is a structure of a color mixture synchronization circuit of an LED light string. The LED light string includes a plurality of LED lights each of which has two input pins that are respectively an input pin of two light emitting chips of four primary color light emitting chips of R, G, B, and Y that are connected in parallel and opposite in direction and an input pin of the remaining two light emitting chips that are connected in parallel and opposite in direction; and two output pins that are respectively an output pin of the two light emitting chips of the four primary color light emitting chips of R, G, B, and Y that are connected in parallel and opposite in direction and an output pin of the remaining two light emitting chips that are connected in parallel and opposite in direction. | 02-19-2015 |
20150054415 | THREE-CHANNEL TUNED LED LAMP FOR PRODUCING BIOLOGICALLY-ADJUSTED LIGHT - An LED lamp comprising a housing, a drive circuit, and a plurality of LED dies driven by the drive circuit, The plurality of LED dies may be in a ratio of at least one of 15 mint LED dies to 5 hyper red LED dies to 4 blue LED dies and 1 mint LED die to 1 hyper red LED die to 1 blue LED die. The drive circuit may operate the LED dies such that a relative peak intensity of the blue LED dies is within the range from 80%-90% or 90%-100% of a peak intensity of the hyper red LED dies, and a relative peak intensity of the mint LED dies is within the range of 50%-60% or 30%-40% of the peak intensity of the hyper red LED dies. | 02-26-2015 |
20150061516 | LIGHT-EMITTING DIODE LIGHTING SYSTEM - The present application discloses a light-emitting diode (LED) lighting system, including: a toroidal transformer comprising a pair of input terminals and a pair of output terminals; and an illuminant comprising an LED circuit; wherein the illuminant is electrically connected to the pair of output terminals of the toroidal transformer. The present application uses a toroidal transformer to simplify a circuit and reduce the number of electronic parts used. On one hand, a service life of a product can be prolonged, and on the other hand, costs can be reduced and a recycling rate is high, which is beneficial to environmental protection. | 03-05-2015 |
20150108910 | Apparatus and method for controlling LED light strings - An enhanced control mechanism for an LED light string system is provided for switching between one of two DC output phases or polarities so as to actuate one or the other of two LEDs within the bulbs on the light string. The control mechanism is further configured to allow switching so as to pass through the input power provided by a high-to-low voltage converter that is plugged into its electrical power feeding end. The control mechanism may then provide rectified AC voltage, or DC voltage, of various switched values to the LED string according to the particular needs of the LED bulbs. | 04-23-2015 |
20150115816 | SOLID STATE LIGHTING DEVICE AND METHOD FOR OPERATING THE SAME - A lighting device employs at least one string of LEDs as a lighting source. The string of LEDs may be coupled in series between a power supply node and ground. In order to accurately determine a drive current running through or drive voltage across the string of LEDs, the drive current through the string of LEDs or the drive voltage across the string of LEDs is sampled randomly or semi-randomly, and a moving average is determined from each one of the samples. By sampling the drive current through or drive voltage across the string of LEDs randomly or semi-randomly, inaccuracies due to synchronization of the sampling with interference in the drive current signal or the drive voltage signal are effectively prevented. Accordingly, an accurate measurement of the drive current through or the drive voltage across the string of LEDs may be obtained. | 04-30-2015 |
20150115817 | CONSTRUCTION IMPROVEMENT OF LED LIGHT SET - The present invention provides construction improvement of LED light set mainly including a controller connected with an electricity plug and a main light string of a plurality of main light bulbs in serial arrangement while each of the main light bulbs is individually connected with an associate light string of a plurality of associate light bulbs as characterized in that a main control IC is provided within the controller to control the main light string operation and an associate control IC is provided within each main light bulb to control the associate light string operation. Thereby the capability of the associate control IC within each main light bulb to reduce both voltage and current is utilized to enable every associate light string to use an associate conducting wire thinner than a main conducting wire in order to reduce the manufacturing cost significantly. | 04-30-2015 |
20150123551 | STRUCTURE OF LED LIGHT SET - An LED light set includes a controller connected with an electric plug and a main light string of a plurality of main light bulbs in serial arrangement. Each of the main light bulbs is connected with an associate light string of a plurality of associate light bulbs. A main control IC is provided in the controller to control voltage and current supplied to the main light bulbs of the main light string. An associate control IC is provided within each of the main light bulbs to control voltage and current supplied to the associate light bulbs of the associate light string. The voltage and current supplied to the associate light strings are controlled to be lower than those supplied to the main light string so that conducting wires of each of the associate light string can be made thinner than conducting wires of the main light string. | 05-07-2015 |
20150137689 | SYSTEMS AND METHODS FOR A CURRENT SHARING DRIVER FOR LIGHT EMITTING DIODES - Systems and methods for a current sharing driver for light emitting diodes are disclosed. One disclosed system includes: a first string of LEDs; a second string of LEDs connected in parallel with the first string; a first current control device connected in series with the first string of LEDs; a second current control device connected in series with the second string of LEDs; a first voltage measurement device coupled to the first string of LEDs and the second string of LEDs, the first voltage measurement circuit coupled to the first current control device and configured to control the first current control device; and a second voltage measurement device coupled to the first string of LEDs and the second string of LEDs, the second voltage measurement circuit coupled to the second current control device and configured to control the second current control device. | 05-21-2015 |
20150145426 | APPARATUS AND METHOD FOR DRIVING SEMICONDUCTOR LIGHT-EMITTING DEVICE ASSEMBLY - The disclosure provides a driving apparatus and a method for driving a semiconductor light-emitting device assembly. The apparatus includes: a driving unit configured to drive the semiconductor light-emitting device assembly; and a cycle by cycle control unit. The cycle by cycle control unit may include: a sampling circuit configured to sample a current instantaneous value of the driving unit or the semiconductor light-emitting device assembly; and an adjusting circuit configured to adjust an output of the driving unit when the current instantaneous value sampled by the sampling circuit is larger than or equal to a preset reference value. The driving apparatus and method for driving the semiconductor light-emitting device assembly may effectively reduce an inrush current on the light-emitting devices and have a lower cost. | 05-28-2015 |
20150145427 | BOOST AND LINEAR LED CONTROL - A light emitting diode (LED) lighting system includes a switching power converter having an input for coupling to an alternating current (AC) power source, an output, and a switch. The LED lighting system also includes an LED lighting subsystem coupled to receive power from the output of the switching power converter. The LED lighting subsystem includes a current source for one or more LEDs, and the current source has a control node and a sense node. The LED lighting system additionally includes a switch state controller coupled to the switching power converter and coupled to the LED lighting subsystem. The switch state controller controls switching of the switch and varies a control current provided to the control node of the current source based on at least a parameter sensed from the sense node. | 05-28-2015 |
20150312974 | SEPIC DRIVER CIRCUIT WITH LOW INPUT CURRENT RIPPLE - A SEPIC driver circuit with low input current ripple is disclosed. Embodiments of the present invention provide a driver circuit that accommodates universal input, has a wide output voltage range and good efficiency. An LED lighting system using such as circuit is also disclosed. In at least some embodiments, the circuit is configured as a single-ended primary inductor converter circuit using a magnetic element, and a floating capacitor is connected between the input winding and the output winding of the magnetic element. In some embodiments, an inductor is also included at the DC input to the circuit. An output rectifier such as a diode can also be connected to the output winding of the magnetic element, and an output capacitor can be connected across the output of the circuit. An FET, a bipolar transistor, or a plurality of FETs can be used as the switching device. | 10-29-2015 |
20150334791 | LED BACKLIGHT FOR LIQUID CRYSTAL DISPLAY (LCD) APPARATUS - A LED backlight for a liquid crystal display (LCD), having a boost circuit for boosting in different display modes, an input voltage for operating each LED in a current display mode. The display modes include 2D and 3D display modes. A plurality of LED strings which are connected in parallel, wherein each LED string having a predetermined number of LEDs connected in series and receives the working voltage required for operating from the boost circuit. A current regulation circuit for regulating in the different display modes, with current flowing through each LED string, such that a ratio of the current flowing through each LED string in the 3D display mode and in the 2D display mode is changed. A controller provides a driving signal to drive the boost circuit, and provides different voltages to the current regulation circuit in the different display modes. | 11-19-2015 |
20150366017 | BACKLIGHT OF LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING CIRCUIT THEREOF - The present invention relates to a backlight of a liquid crystal display device and a driving method thereof. The backlight comprises a LED lamp bead group and a backlight driving module. The LED lamp bead group includes a plurality of strings of LED lamp bead which are opposite in term of positive and negative directions. The backlight driving module is electrically connected to the LED lamp bead group to output a voltage signal and a current signal to drive the LED lamp bead group, wherein the voltage signal is configured as more than one serials of periodic square-wave signal, under the action of which a string of LED lamp bead of positive direction and a string of LED lamp bead of negative direction emit light in an alternate manner, and the brightness of emitted light is determined by the magnitude of the current signal. | 12-17-2015 |
20150382410 | Light Sources Utilizing Segmented LEDs to Compensate for Manufacturing Variations in the Light Output of Individual Segmented LEDs - A light source and method for making the same are disclosed. The light source includes a plurality of Segmented LEDs connected in parallel to a power bus and a controller. The power bus accepts a variable number of Segmented LEDs. The controller receives AC power and provides a power signal on the power bus. Each Segmented LED is characterized by a driving voltage that is greater than 3 times the driving voltage of a conventional LED fabricated in the same material system as the Segmented LED. The number of Segmented LEDs in the light source is chosen to compensate for variations in the light output of individual Segmented LEDs introduced by the manufacturing process. In another aspect of the invention, the number of Segmented LEDs connected to the power bus can be altered after the light source is assembled. | 12-31-2015 |
20160021724 | CONNECTABLE AND SYNCHRONIZABLE LIGHT STRINGS - Embodiments of the present disclosure include a decorative light string including a first light strand, a power supply, a controller, and an electrical connector. The first light strand includes a plurality of parallel connected light emitting elements. The power supply is configured to convert alternating current (AC) line power to direct voltage (DC) voltage power to power the first light strand. The controller is operatively coupled to the first light strand and the power supply. The controller is configured to control the plurality of light emitting elements. The electrical connector couples a first light strand to a second decorative light string via the AC line power. | 01-21-2016 |
20160029452 | LIGHTING APPARATUS - Provided is a lighting apparatus using an LED as a light source. The lighting apparatus may include a plurality of light emitting units each including one or more semiconductor packages having an equal number of LEDs mounted thereon, the light emitting units may be arranged in a longitudinal direction to form a line light source, and the LEDs included in each of the light emitting units may be divided into a plurality of LED groups. | 01-28-2016 |
20160064925 | OVERVOLTAGE PROTECTION CIRCUIT, OVERVOLTAGE PROTECTION METHOD AND PANEL DRIVING CIRCUIT - The present invention provides an overvoltage protection circuit, an overvoltage protection method and a panel driving circuit, wherein, the overvoltage protection circuit adjusts drive output voltage of LED strings coupled with a main IC and a secondary IC and includes a main IC overvoltage triggering circuit and a secondary IC overvoltage triggering circuit, wherein, the main IC overvoltage triggering circuit connected respectively in series with said main IC and several LED strings, said secondary IC overvoltage triggering circuit connected respectively in series with the secondary IC and several LED strings, overvoltage protection triggering points are set respectively in the main IC and the secondary IC, and the voltage value of the overvoltage protection's triggering point of the secondary IC is less than that of the main IC. | 03-03-2016 |
20160088695 | SHORT-CIRCUIT PROTECTION CIRCUIT AND ELECTRONIC DEVICE - A short-circuit protection circuit to execute a short-circuit protection for a LED module of an electronic device. The LED module includes a positive input port. the short-circuit protection circuit includes a control unit for controlling the LED module to work or do not work, a feedback module, a comparison module, and a trigger module. The feedback module is connected between the positive input port of the LED module and ground, and is used to detect a voltage of the positive input port and produce a feedback voltage proportional to the voltage of the positive input port. The comparison module produces a first comparison signal when comparing the feedback voltage is less than a reference voltage. The trigger module produces an off trigger signal to trigger the control unit to control the LED module to not work, when receiving the first comparison signal. | 03-24-2016 |
20160113082 | VISIBLE LIGHT COMMUNICATION TRANSCEIVER - A visible light communication (VLC) transceiver includes a substrate, a lens module and a plurality of channel units. The channel units are disposed on the substrate in an array to provide different bidirectional communication channels. Wherein, each of the channel units respectively includes at least one light-emitting diode (LED). The LED serves as a visible light emitter in an illumination time slot, and the LED serves as a visible light receiver in a dark time slot. The channel units can enhance communication bandwidth by using modulation technology such as spatial multiplexing or time multiplexing. The lens module is disposed on an optical path of the channel units. The lens module actively tracks the receiving situation of the visible light receiver to improve the signal quality of high-speed multiplexing communication. | 04-21-2016 |
20160143097 | COLOR TEMPERATURE CONTROLLED AND LOW THD LED LIGHTING DEVICES AND SYSTEMS AND METHODS OF DRIVING THE SAME - The purposes of the devices described herein are to provide an LED lighting device capable of efficiently and economically emitting light having a selectable color temperature or a warm-on-dim feature when driven with AC power and to provide LED lighting devices which have an improved power factor and a reduced total harmonic distortion when powered with AC power. | 05-19-2016 |
20160157304 | POWER SUPPLY FOR LED LIGHTING SYSTEM | 06-02-2016 |
20160174306 | LIGHT EMITTED DIODE CIRCUIT | 06-16-2016 |
20160205741 | ILLUMINATION SYSTEM AND LUMINAIRE | 07-14-2016 |
20160255683 | LINEAR DIMMING LED DRIVER CIRCUIT CAPABLE OF ADJUSTING COLOR TEMPERATURE | 09-01-2016 |