Patent application number | Description | Published |
20090278772 | ORGANIC LIGHT EMITTING DISPLAY AND METHOD FOR DRIVING THE SAME - An organic light emitting display and a method for driving the same. An organic light emitting display includes: a frame memory having a first portion configured to store a first portion of image signals that is the same in an n−1 | 11-12-2009 |
20100033409 | ORGANIC LIGHT EMITTING DISPLAY DEVICE - An organic light emitting display device including a power generator for sending a plurality of voltages to a display unit. The display unit receives a scan signal, a light emitting control signal, and a data signal, which enable a current corresponding to the data signal to flow from a first power supply to a second power supply. The display unit includes a pixel circuit that includes a storage capacitor adapted to store the data signal and to stabilize the stored data signal utilizing a third power supply. A driver IC includes a signal generator for generating the data signal, the scan signal, and the light emitting control signal, and further includes a power generator for generating the first power, the second power, and the third power, wherein the second power and the third power are at a lower voltage than that of the first power. | 02-11-2010 |
20100033467 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A DC-DC converter with improved efficiency achieved by controlling a voltage of a power supply transmitted to an organic light emitting diode in accordance with a voltage of a battery, and an organic light emitting display device using the same. A DC-DC converter according to one embodiment includes a voltage detecting unit for detecting a voltage of a battery, a booster circuit for receiving and boosting the input voltage to generate and output a first power, and an inverter circuit for receiving and inverting the input voltage to generate and output a second power, where the voltage of the second power is controlled and output corresponding to the input voltage detected by the voltage detecting unit. | 02-11-2010 |
20100220039 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY USING THE SAME - A DC-DC converter generates a first power and a second power for driving pixels in an organic light emitting display, such that the voltages of the first power and the second power are substantially independent of the voltage from a power supply or a battery. A voltage detector detects the voltage from the power supply, and a booster circuit and an inverter circuit respectively boost and invert the voltage from the power supply to generate and output the first and the second powers, respectively, for the pixels. A PWM controller controls the booster circuit and the inverter circuit to control voltages of the first power and the second power. The booster circuit is adapted to reduce the voltage from the power supply to be lower than the voltage of the first power when the voltage from the power supply detected by the voltage detector is higher than a reference voltage. | 09-02-2010 |
20110025670 | Organic Light Emitting Display and Method of Driving the Same - An organic light emitting display capable of reducing power consumption in a standby mode to increase the use time of a battery and a method of driving the same. The organic light emitting display includes a pixel unit for displaying an image by utilizing a plurality of frames and in accordance with data signals and scan signals; a data driver for outputting the data signals; a scan driver for outputting the scan signals; and a controller for controlling the data driver and the scan driver so that, in at least one frame of the plurality of frames, the scan signals are not transmitted to the pixel unit. | 02-03-2011 |
20110025677 | ORGANIC LIGHT EMITTING DISPLAY AND METHOD OF DRIVING THE SAME - An organic light emitting display capable of reducing power consumption in a standby mode and a method of driving the same. The organic light emitting display includes a pixel unit having a first emission region and a second emission region, wherein the pixel unit is configured to generate a driving current in accordance with data signals and scan signals to emit light so that light is emitted by the pixel unit only in the first emission region in a standby mode, a data driver for transmitting the data signals only to the first emission region in the standby mode, a scan driver for outputting the scan signals, and a power source supplier for generating and outputting voltages of an initialization power source and for blocking the driving current from flowing to the second emission region by utilizing a voltage of the initialization power source in the standby mode. | 02-03-2011 |
20110080433 | Driver ic and organic light emitting diode display using the same - A driver IC comprises a voltage detector configured to detect an input voltage to the driver IC, a charge pump configured to generate a regulator driving voltage by amplifying the input voltage and output the regulator driving voltage, a regulator configured to receive the regulator driving voltage and output a regulator voltage, a gamma circuit configured to generate a gray scale voltage using the regulator voltage, and a voltage controller configured to generate a command signal corresponding to the input voltage. An OLED display comprises a pixel unit configured to display an image in response to a data signal, a scan signal, a light emitting control signal, first and second voltages, the driver IC, a scan driving unit, and a power supply unit configured to adjust levels of the first and second voltages in response to the input voltage, and transmit the first and second voltages to the pixel unit. | 04-07-2011 |
20110084954 | ORGANIC LIGHT EMITTING DISPLAY DEVICE AND DRIVING METHOD FOR THE SAME - An organic light emitting display device that includes: a pixel unit that displays an image by receiving a data signal, a scan signal, a first pixel power, and a second pixel power; a regulator that receives first input voltage from the outside and boosts the received first input voltage to generate the first pixel power and inverts the received first input voltage to generate second pixel power; a driver driving unit that includes a power generator and a signal generator generating the data signal and the scan signal. Further, a switching unit that selectively connects the pixel unit with the regulator or the pixel unit with the driver driving unit; and a control unit that transmits the first pixel power and the second pixel power generated by the regulator or the driver driving unit to the pixel unit. | 04-14-2011 |
20110115776 | DC-DC Converter and Organic Light Emitting Display Device Using the Same - A DC-DC converter and an organic light emitting display device using the same. Here, a DC-DC converter is provided with a voltage sensor for sensing a battery voltage outputted from a battery. A regulator receives the battery voltage from the battery. When the battery voltage is a set value or less, the regulator is stopped from bypassing the battery voltage. When the voltage of the inputted power source exceeds the set value, the regulator is driven to lower the battery voltage. When the battery voltage is the set value or less, a controller controls the driving of the regulator. A power generator receives the regulated battery voltage to output a first pixel power source and a second pixel power source. | 05-19-2011 |
20110187697 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME - An organic light emitting display device includes a DC-DC converter that is capable of reducing power consumption by increasing efficiency. The DC-DC converter includes: a variable resistor; an oscillator configured to output a frequency control signal having a frequency corresponding to a resistance value of the variable resistor; a booster configured to receive the control signal and to output a first power by switching an input voltage in accordance with the control signal; and an inverter configured to receive the control signal and to generate a second power by switching and inverting the input voltage in accordance with the control signal. | 08-04-2011 |
20110205202 | ORGANIC ELECTROLUMINESCENT DISPLAY APPARATUS AND METHOD OF DRIVING THE SAME - A method and system for controlling power consumption of a display is disclosed. The method includes determining battery voltage, brightness of ambient light, temperature, and adjusting the brightness of the organic electroluminescent display apparatus, or by adjusting the voltage difference between a first power voltage and a second power voltage of the organic electroluminescent display apparatus, according to the battery voltage, the brightness of the ambient light, the temperature, and image data of the organic electroluminescent display apparatus. | 08-25-2011 |
20110205204 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY USING THE SAME - A DC-DC converter and an organic light emitting display using the DC-DC converter are provided. The DC-DC converter can generate a first voltage and a second voltage lower than the first voltage, where the DC-DC converter includes a first voltage generator for generating the first voltage by switching an input voltage and accumulating energy in a first coil, a second voltage generator for generating the second voltage by switching an input voltage and accumulating energy in a second coil, a pulse width modulation (PWM) controller for controlling switching times of the first and second voltage generators in accordance with a control signal, and a voltage adjuster for generating the control signal to vary a voltage level of the second voltage and control a time of change of the second voltage. | 08-25-2011 |
20110273109 | Organic light emitting display and method of driving the same - An organic light emitting display includes a pixel unit including pixels coupled to scan lines and data lines, a DC-DC converter for transmitting a voltage level of at least one power source of a first power source and a second power source to provide the power source to the pixel unit, and a voltage controller for controlling a voltage level transition time of the DC-DC converter. A method of driving such an organic light emitting display may include converting an input voltage into a predetermined first voltage level of a driving power source, adjusting the first level voltage of the driving power source to a second level voltage, wherein the second level voltage reaches a steady state, and applying black data to a pixel unit during a time period when the first level voltage is being adjusted to the second level voltage. | 11-10-2011 |
20110273111 | DC-DC CONVERTER, ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE INCLUDING THE SAME, AND METHOD OF DRIVING THE ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE - In order to adjust a black level by using a power supply voltage, an organic electroluminescent display device includes: a plurality of scan lines arranged in a row direction; a plurality of data lines arranged in a column direction; a plurality of pixels formed at intersections between the plurality of scan lines and the plurality of data lines; and a direct current (DC)-DC converter to supply a power supply voltage to the plurality of pixels, wherein the DC-DC converter includes a set resistor, and to convert a reference voltage selected according to a set voltage determined by the set resistor into a power supply voltage and to supply the power supply voltage to the plurality of pixels. | 11-10-2011 |
20110273422 | DC-DC CONVERTER, ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE INCLUDING THE SAME, AND METHOD OF DRIVING THE ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE - A direct current (DC)-DC converter for preventing ignition and destruction of an organic electroluminescent display device by not driving the current when a parameter of the organic electroluminescent display device is abnormal, an organic electroluminescent display device including the DC-DC converter, and a method of driving the organic electroluminescent display device. | 11-10-2011 |
20110273427 | Organic light emitting display and method of driving the same - An organic light emitting display, and a method of driving the same, controls the voltage of a second power source in accordance with an ambient temperature. The organic light emitting display includes a driver IC configured to drive a pixel unit and to generate a control signal in accordance with an ambient temperature, and a DC-DC converter configured to generate a first power source and a second power source from an input voltage, to change a voltage of the second power source in accordance with the control signal from the driver IC, and to output the changed voltage of the second power source and the first power source. | 11-10-2011 |
20120032938 | ORGANIC LIGHT-EMITTING DISPLAY APPARATUS AND METHOD OF PROVIDING POWER THEREIN - An organic light-emitting display apparatus and method of providing power in the organic light-emitting display apparatus. The organic light-emitting display apparatus including an organic light-emitting panel, a power supplying unit for supplying a first power voltage and a second power voltage to the organic light-emitting panel, and a driver integrated circuit comprising a short protection unit, wherein the short protection unit detects a short based on at least one of the first power voltage and the second power voltage and outputs an enable off signal that blocks the first power voltage and the second power voltage from being supplied to the power supplying unit. | 02-09-2012 |
20120176361 | DC-DC CONVERTER AND MOBILE COMMUNICATION TERMINAL USING THE SAME - A DC-DC converter for converting an input power to generate a first power and for outputting the first power to a first output terminal, the DC-DC converter including: a resistor unit for electrically connecting a set resistor to the first output terminal when the voltage of input power is in a specific range, and a mobile communication terminal using the same. Here, the DC-DC converter is capable of reducing or removing a pulse skip mode by increasing a load of an output end if it is determined that the voltage of the input power is in the specific range, by sensing the input power. | 07-12-2012 |
20120256897 | ORGANIC LIGHT EMITTING DIODE DISPLAY HAVING SHORT DETECTING CIRCUIT AND METHOD OF DRIVING THE SAME - An organic light emitting diode display including a short detecting circuit and a method of driving the same are disclosed. The organic light emitting diode display includes a pixel unit including pixels coupled to scan lines and data lines, a DC-DC converter for outputting a first power source and a second power source when a start signal is supplied, a first power source line and a second power source line for supplying the first power source and the second power source output from the DC-DC converter to the pixel unit, and a short detecting circuit for determining whether the first power source line and the second power source line are shorted before the DC-DC converter is driven and for supplying the start signal to the DC-DC converter when the first power source line and the second power source line are not shorted. | 10-11-2012 |
20130002639 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY INCLUDING THE SAME - A DC-DC converter and an organic light emitting display including the same are disclosed. The DC-DC converter generates first and second power voltages for the organic light emitting display with an inverting converter and a boost converter. The current of the converters is monitored, and if the currents exceed a threshold, the associated converter is stopped to prevent further damage to the display. | 01-03-2013 |
20130002736 | ORGANIC LIGHT EMITTING DISPLAY AND METHOD OF DRIVING THE SAME - An organic light emitting display is disclosed. The display includes a pixel unit for displaying a black image during a non-emission period and for displaying an image based on data during an emission period in every frame period. The display also includes a current sensor which determines current flowing in a power line during the non-emission period and generates a stop signal if the current is greater than a threshold, and a power supply which supplies power to the pixel unit unless the stop signal is received from the sensor. | 01-03-2013 |
20130229402 | POWER GENERATOR AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A power generator includes a booster that boosts an input voltage supplied from a power supply unit and that supplies a boosted input voltage to an output terminal, a selector that selects one of the input voltage and a voltage at the output terminal as a selected voltage and supplies the selected voltage as an output voltage, a reference voltage generator that generates a reference voltage based on the output voltage, a comparator that compares a feedback voltage supplied from the booster and the reference voltage with each other, and a controller that controls the booster to output a chosen voltage from the output terminal according to a comparison result of the comparator. | 09-05-2013 |
20130235010 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY INCLUDING THE SAME - Disclosed are a direct current converter and an organic light emitting display including the converter. The converter includes a power supply generating an input power, a first power generator receiving the input power and a selected voltage from a selector and generating a first voltage, a first output terminal connected to the first power generator and outputting the first voltage; a second power generator receiving the input power and generating a second voltage, a second output terminal connected to the second power generator and outputting the second voltage, an external feedback wiring providing a feedback voltage, a feedback terminal connected to the external feedback wiring and inputting the feedback voltage to the selector, and the selector connected to and transferring the selected voltage to the first power generator, where the selected voltage is one of the feedback voltage and the voltage output from the first output terminal. | 09-12-2013 |
20130235016 | ORGANIC LIGHT EMITTING DISPLAY AND METHOD OF DRIVING THE SAME - An organic light emitting display is provided. The organic light emitting display includes a display unit coupled to scan lines and data lines and including pixels configured to receive first and second power sources, and a DC-DC converter for generating the first and second power sources. The DC-DC converter includes first and second power source generating units for generating the first and second power sources from an input power source and for outputting the first and second power sources to first and second output ends, a controller for controlling driving of the first and second power source generating units, and first and second short sensing units for outputting first and second short sensing signals to the controller when voltages of the first and/or second output ends are greater than or equal to corresponding first and second reference voltages. | 09-12-2013 |
20130235017 | POWER SUPPLY UNIT AND ORGANIC LIGHT EMITTING DISPLAY INCLUDING THE SAME - Disclosed is a power supply unit including a DC-DC converter including an output terminal and resistor coupling terminal and an external resistor coupled to the resistor coupling terminal, where the DC-DC converter includes a first power generation unit which outputs a predetermined current to the output terminal, and a sensing circuit unit that includes a sensing resistor located between the first power generation unit and the output terminal and stops an operation of the first power generation unit depending on a current value flowing in the sensing resistor. A power supply unit and an organic light emitting display including the power supply unit include a sensing circuit unit that stops operation of the power supply unit to prevent an additional damage when an abnormal current occurs. | 09-12-2013 |
20130241808 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY INCLUDING THE SAME - A DC-DC converter includes a first power source generator, the first power source generator including an input port and a first output port, the first power source generator being configured to receive an input power source to the input port, and being configured to generate a first power source, the first power source being output to the first output port, and a selecting unit, the selecting unit being configured to selectively transmit, to the first power source generator, one of: a feedback voltage, the feedback voltage being input from an external feedback wiring line via a feedback terminal, and a voltage of the first output port. | 09-19-2013 |
20140118323 | ORGANIC LIGHT EMITTING DISPLAY - An organic light emitting display includes: a plurality of pixels coupled to scan lines and data lines; a scan driver that supplies a scan signal to the pixels through the scan lines according to a predetermined scan frequency; a data driver that supplies a data signal to the pixels through the data lines; and a first switching regulator that supplies a first voltage to the pixels and has a changeable switching frequency. In the organic light emitting display, the switching frequency of the first switching regulator is changed while avoiding the scan frequency of the scan driver. Accordingly, it is possible to provide an organic light emitting display which can improve power conversion efficiency and reduce a flicker phenomenon. | 05-01-2014 |
20140118413 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - There are provided a DC-DC converter and an organic light emitting display device using the same. A DC-DC converter includes a switching module that converts an input voltage into a first voltage through switching operations of a plurality of switches that are turned on or off in response to a pulse width modulation (PWM) signal, and outputs the first voltage; a sensing unit that senses driving current supplied to a load to which the first voltage is provided; and a control module that controls the switching module by generating the PWM signal. The control module is configured to adaptively control the turn-on resistance of the switching module according to the sensed result of the sensing unit. Accordingly, it is possible to provide a DC-DC converter and an organic light emitting display device using the same which has optimal efficiency by adaptively operating according to a load condition. | 05-01-2014 |
20140118414 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - There are provided a DC-DC converter and an organic light emitting display device using the same. A DC-DC converter includes a converting module and a sensing unit. The converting module includes a switching module and a control module. The switching module has a plurality of switches, and each of the plurality of switches converts an input voltage into a first voltage and outputs the first voltage while being turned on/off in response to a corresponding pulse width modulation (PWM) signal. The control module controls a switching operation of the switching module by generating the PWM signal. The sensing unit senses driving current supplied to a load to which the first voltage is provided. | 05-01-2014 |
20140143560 | POWER CONTROL DEVICE AND DISPLAY DEVICE INCLUDING THE SAME - A power controller includes an inductor coupled to an input terminal to which an input voltage is input, a first switch coupled between the inductor and a first power source voltage output terminal, a second switch coupled between the inductor and a ground, a switch controller controlling a voltage output to the first power source voltage output terminal by controlling duties of the first and second switches according to a feedback voltage input to a feedback terminal corresponding to a voltage output to the first power source voltage output terminal, and a diode coupled between the first power source voltage output terminal and the feedback terminal, and preventing a voltage of the first power source voltage output terminal from increasing higher than a breakdown voltage of the first and second switches. | 05-22-2014 |
20140232275 | ORGANIC LIGHT EMITTING DISPLAY - An organic light emitting display that includes a display panel, a power supply and a coupling member. The display panel includes scan lines, data lines, first power lines and a plurality of pixels. The power supply is positioned at the outside of the display panel, and supplies first power to the display panel through a coupling member. The coupling member includes first and second coupling portions respectively coupled to the power lines, first and second coupling lines transmitting the first power supplied from the power supply to the respective first and second coupling portions, and a feedback line transmitting the voltage of the second coupling portion to the power supply. Accordingly, it is possible to provide an organic light emitting display capable of precisely controlling the voltage of output power and preventing the deterioration of the luminance of a display panel. | 08-21-2014 |
20140362072 | POWER CONVERTER, DISPLAY DEVICE INCLUDING POWER CONVERTER, SYSTEM INCLUDING DISPLAY DEVICE, AND METHOD OF DRIVING DISPLAY DEVICE - A power converter includes a voltage conversion unit that provides a first driving voltage at a first output electrode by converting a power supply voltage in response to a first control signal, the voltage conversion unit being configured to provide a second driving voltage at a second output electrode by converting the power supply voltage after a short detection period, the voltage conversion unit being configured to shut down in response to a third control signal, and a short detection unit that generates the third control signal by comparing a magnitude of a voltage of the second output electrode with a magnitude of a reference voltage during the short detection period. | 12-11-2014 |
20150061540 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME - An organic light emitting display device includes a DC-DC converter to supply first and second voltages to one or more pixels. The DC-DC converter includes a first voltage supply to convert an input voltage to a first voltage and a second voltage supply to convert the input voltage to a second voltage. The first and second voltages are coupled to opposing ends of the one or more pixels. The first voltage supply includes a first inductor between a first input terminal and first node, a first transistor between the first node and a reference potential, a second transistor between the first node and first output terminal, a first diode between the first node and a second node, a second diode between the second node and first output terminal, and a first switch between the second node and first output terminal. | 03-05-2015 |
20150076997 | DC-DC CONVERTER AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME - A DC-DC converter includes a voltage conversion circuit unit, a control unit, and a capacitor check unit. The voltage conversion circuit unit converts an input voltage to a first voltage. The control unit controls the voltage conversion circuit unit based on a feedback voltage and a reference voltage. The capacitor check unit determines whether a capacitor is coupled to a capacitor coupling terminal based on sensing a voltage of the capacitor coupling terminal, which is selectively coupled to the first control unit. | 03-19-2015 |