Patent application number | Description | Published |
20100237800 | LIGHT EMITTING DEVICE AND DRIVING CIRCUIT THEREOF - A light emitting device comprises a first light emitting unit and a second light emitting unit connected in series with each other, and a PTF unit connected in parallel with the first light emitting unit and in series with the second light emitting unit. Each of the first light emitting unit and second light emitting unit comprises at least one LED. The PTF unit allows the second light emitting unit to be operated before operation of the first light emitting unit upon application of an AC voltage source. The light emitting device reduces total harmonic distortion and flickering, and improves power factor and optical efficiency. A driving circuit of the light emitting device is also disclosed. | 09-23-2010 |
20100244727 | LIGHT-EMITTING DIODE DRIVER - A light-emitting diode (LED) driver used to power at least one LED with an alternating current (AC) voltage source is provided. The LED driver includes a rectifying unit applying N-fold higher voltage than the voltage from the AC voltage source to the LED. The rectifying unit includes a first charging unit to charge a first voltage, and a second charging unit to charge a second voltage. The first voltage includes the voltage at the AC voltage source during a first half-cycle of one AC voltage cycle, and the second voltage includes the first voltage and the voltage at the AC voltage source during the second half-cycle of the AC voltage cycle. Accordingly, the LED driver may improve light-emitting efficiency and reduce flicker of LEDs. | 09-30-2010 |
20100328961 | LIGHT-EMITTING MODULE - A light-emitting module includes a printed circuit board (PCB), a fastening member, and a light-emitting package. The PCB has a power-supplying pad to provide electrical power. The fastening member is disposed on the PCB and has a package-receiving hole exposing the power-supplying pad. The light-emitting package is received by the package-receiving hole such that the light-emitting package is electrically connected to the power-supplying pad and detachably coupled with the fastening member. Therefore, the light-emitting package may be easily combined with the PCB, and the light-emitting package may be replaced when desired. | 12-30-2010 |
20110181196 | DIMMER FOR A LIGHT EMITTING DEVICE - Exemplary embodiments of the present invention relate to a dimmer for a light emitting device using an alternating (AC) voltage source. The dimmer includes a switch to be switched in response to a switching control signal and to deliver an AC voltage of an AC voltage source to the light emitting device, a current detector to detect an electric current to be provided to the light emitting device and to output a current detection signal, and a controller to output the switching control signal in response to a dimming control signal and the current detection signal. | 07-28-2011 |
20120074849 | ILLUMINATION SYSTEM - An illumination system according to an exemplary embodiment of the present invention includes at least one light emitting apparatus including at least one light emitting module detachably coupled to the at least one light emitting apparatus, the at least one light emitting module including an information storage unit to store characteristic information of the at least one light emitting module. The at least one light emitting apparatus also includes a controller configured to detect whether the at least one light emitting module is connected to or disconnected from the at least one light emitting apparatus, and to read out the characteristic information of the at least one light emitting module according to a detection result, wherein the characteristic information includes unique identification information or absolute lifetime information of the at least one light emitting module. | 03-29-2012 |
20120098448 | LIGHT EMITTING DIODE DRIVING DEVICE - An exemplary embodiment of the present invention discloses a light emitting diode (LED) driving device for an LED device having a plurality of LEDs, the driving device including a rectifying unit configured to receive an alternating current (AC) voltage and output a rectified voltage, and a driving control unit configured to drive the plurality of LEDs based on stored data by receiving the rectified voltage at a first period. | 04-26-2012 |
20140362071 | BACKLIGHT DRIVING APPARATUS - A backlight driving apparatus that drives a backlight unit having a plurality of LEDs is provided, which includes a rectifying unit rectifying an AC voltage and generating a driving voltage for the plurality of LEDs, a plurality of connection changing units changing connection relations between the plurality of LEDs depending on a level of the driving voltage, and a light output compensation unit generating a compensation voltage using the driving voltage and selectively supplying the compensation voltage to the plurality of LEDs. | 12-11-2014 |
20150028760 | LED LUMINAIRE - A light-emitting diode (LED) luminaire includes a light-emitting part, a rectification unit configured to perform full-wave rectification of an alternating current (AC) voltage to supply a first drive voltage to the light-emitting part, a power factor compensation unit configured to be charged with the first drive voltage during a charge period and supply a second drive voltage to the light-emitting part during a compensation period, and an LED drive controller configured to determine a voltage level of the first drive voltage or the second drive voltage and control sequential driving of the first LED group to the n | 01-29-2015 |
20150084541 | LED DIMMER, LED LIGHTING DEVICE COMPRISING SAME, AND METHOD FOR CONTROLLING DIMMING OF LED LIGHTING DEVICE - A light-emitting diode (LED) dimmer for an LED lighting device, including a power switch, a drive voltage supply, and a LED light-emitting unit. Operating zones of the LED lighting device are changed in accordance with the switching of the power switch, and a dimming level for a next operating zone is determined on the basis of the dimming level and time while the power switch was on during the previous operating period. | 03-26-2015 |