Patent application number | Description | Published |
20100013868 | ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - An organic light emitting display device and a method of driving the same. In a method of driving an organic light emitting display device including a second capacitor having a first terminal coupled to a gate electrode of a driving transistor and a first capacitor coupled between the gate electrode of the driving transistor and a first power source, the driving method includes supplying a threshold voltage of an organic light emitting diode to a second terminal of the second capacitor during a period when a first current is sunk via the driving transistor, and supplying a data signal to the second terminal of the second capacitor after a voltage corresponding to a difference between a voltage applied to the gate electrode of the driving transistor and the threshold voltage of the organic light emitting diode is charged in the second capacitor. | 01-21-2010 |
20100220038 | Pixel and Organic Light Emitting Display Device Including the Same - A pixel includes: an organic light emitting diode coupled between a first power supply and a second power supply; a first transistor coupled between the organic light emitting diode and the second power supply; a second transistor coupled to a first node to which a gate electrode of the first transistor is coupled; a first capacitor coupled between the first node and a second node; a third transistor coupled between the second node and a data line; a fourth transistor coupled between the first node and the second node; a fifth transistor coupled between the first transistor and the second power supply; and a second capacitor coupled between the second node and a third node between the first transistor and the fifth transistor. | 09-02-2010 |
20100220086 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A pixel configured to compensate for a threshold voltage of a driving transistor and including an organic light emitting diode coupled between a first power supply and a second power supply; a first transistor coupled between the organic light emitting diode and the second power supply and having a gate electrode coupled to a first node; a second transistor coupled between the first transistor and a data line and having a gate electrode coupled to a scan line; a third transistor coupled between the first transistor and the first node and having a gate electrode coupled to the scan line; a fourth transistor coupled between the first transistor and the second power supply and having a gate electrode coupled to an emission control line; and a fifth transistor coupled between the organic light emitting diode and the first transistor and having a gate electrode coupled to the emission control line. | 09-02-2010 |
20100271363 | ORGANIC LIGHT EMITTING DISPLAY AND DRIVING METHOD THEREOF - An organic light emitting display includes a scan driver for sequentially supplying a scan signal to scan lines; a data driver for supplying data signals to data lines when the scan signal is supplied; a timing controller for controlling the scan driver and the data driver and for supplying one of at least two clock signals to clock supply lines arranged parallel to the scan lines; and pixels positioned at crossing regions of the scan lines, the data lines and the clock supply lines. Each of the pixels includes an organic light emitting diode; a pixel circuit for controlling an amount of current supplied along a current path from a first power source to a second power source via the organic light emitting diode; and a control transistor on the current path and controlled by a corresponding clock signal of the at least two clock signals. | 10-28-2010 |
20110063197 | PIXEL CIRCUIT AND ORGANIC LIGHT EMITTING DISPLAY APPARATUS INCLUDING THE SAME - A pixel circuit includes: a second NMOS transistor coupled to a data line and a scan line, the second NMOS transistor for supplying data signals to a first node; a capacitor having a first terminal coupled to the first node and a second terminal coupled to a second node; an OLED having a first terminal coupled to the second node and a second terminal coupled to a second power source; a first NMOS transistor including a first electrode, a second electrode, and a gate electrode coupled to the first node, and for supplying a current corresponding to a voltage applied to the first node from a first power source to the second power source via the OLED; and a third NMOS transistor coupled to the first NMOS transistor in series and configured to be turned on when a light emission control signal is supplied from a light emission control line. | 03-17-2011 |
20110063198 | PIXEL CIRCUIT AND ORGANIC LIGHT-EMITTING DIODE DISPLAY USING THE SAME - A pixel circuit and an organic light-emitting diode (OLED) display using the pixel circuit is provided. The pixel circuit includes: an OLED; a third N-channel metal-oxide semiconductor (NMOS) transistor coupled to a data line and a first scan line and configured to apply a data signal to a first node; a storage capacitor having one terminal coupled to the first node and the other terminal coupled to a second node; a fourth NMOS transistor coupled between a first power and the second node and configured to apply a voltage of the first power to the second node; a first NMOS transistor having a first electrode, a second electrode, and a gate electrode coupled to the second node; and a second NMOS transistor coupled between the second node and the first electrode of the first NMOS transistor and configured to diode-connect the first NMOS transistor. | 03-17-2011 |
20110063266 | PIXEL CIRCUIT OF DISPLAY PANEL, METHOD OF CONTROLLING THE PIXEL CIRCUIT, AND ORGANIC LIGHT EMITTING DISPLAY INCLUDING THE DISPLAY PANEL - A pixel circuit of a display panel, a method of driving the pixel circuit, and an organic light emitting display device including the display panel. All of a plurality of transistors included in the pixel circuit are NMOS transistors, and the pixel circuit configured to compensate for a voltage change at a source electrode of a driving transistor during light emission. | 03-17-2011 |
20110069058 | PIXEL CIRCUIT OF DISPLAY PANEL, METHOD OF CONTROLLING THE PIXEL CIRCUIT, AND ORGANIC LIGHT EMITTING DISPLAY INCLUDING THE DISPLAY PANEL - A pixel circuit of a display panel, a method of driving the pixel circuit, and an organic light emitting display device including the display panel are provided. All of a plurality of transistors used in the pixel circuit are NMOS transistors, and the pixel circuit is configured to compensate for a voltage change at a source electrode of a driving transistor during light emission. | 03-24-2011 |
20110074757 | PIXEL CIRCUIT AND ORGANIC ELECTROLUMINESCENT DISPLAY INCLUDING THE SAME - A pixel circuit for an organic light emitting display includes: a fourth NMOS transistor including a gate electrode coupled to a first scan line, and a first electrode coupled to a first node; a storage capacitor coupled between the first node and a second node; a third NMOS transistor including a gate electrode coupled to a second scan line, and a first electrode coupled to a data line; a second NMOS transistor including a first electrode coupled to a second electrode of the third NMOS transistor, and a gate electrode and a second electrode coupled to the first node; a fifth NMOS transistor including a gate electrode coupled to an emission control line, and a first electrode coupled to a first power source; an organic light emitting diode (OLED) comprising an anode coupled to the second node; and a first NMOS transistor for providing a driving current to the OLED. | 03-31-2011 |
20110084947 | PIXEL CIRCUIT AND ORGANIC ELECTROLUMINESCENT DISPLAY INCLUDING THE SAME - Pixel circuits and an organic electroluminescent display including the same are provided. The pixel circuit includes: an organic light emitting diode; a fifth transistor coupled to a third scan line, a reference power source, and a first node; a first capacitor coupled between the first node and a second node; a second capacitor coupled between the first node and the organic light emitting diode; a fourth transistor coupled to a second scan line, a data line, and the first node; a sixth transistor coupled to a first scan line, a first power source, and the second node; a second transistor coupled to the second scan line, the second node, and a third node; a third transistor coupled to an emission control line, the first power source, and the third node; and a first transistor coupled to the second node, the third node, and the organic light emitting diode. | 04-14-2011 |
20110134100 | PIXEL CIRCUIT AND ORGANIC ELECTRO-LUMINESCENT DISPLAY APPARATUS - An organic electro-luminescent display apparatus can compensate for the threshold voltage and voltage drop of the driving transistor. The organic electro-luminescent display apparatus divides and drives an initialization time, thereby improving a contrast ratio. The organic electro-luminescent display apparatus minimizes or reduces the change of a current due to a leakage current by correcting the leakage current corresponding to a data voltage with a fixed power source, thereby improving crosstalk. The organic electro-luminescent display apparatus adjusts the duty of the emission control signal, thereby removing or reducing motion blur. | 06-09-2011 |
20110157126 | PIXEL CIRCUIT AND ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE USING THE SAME - A pixel circuit and an organic light emitting diode (OLED) display device using the same are provided. The pixel circuit compensates for a threshold voltage of a driver transistor and for a voltage drop, and separately drives an initialization time to improve a contrast ratio. The pixel circuit further suppresses a leakage current caused by a data voltage using a fixed power source so that current variation caused by the leakage current can be reduced or minimized to improve crosstalk, and the duty of an emission control signal can be adjusted to remove motion blur. The pixel circuit also compensates for a leakage current generated in a turn-off state of a transistor with an increase in a drain-source voltage. | 06-30-2011 |
20110157144 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A pixel of a display with reduced leakage current is disclosed. The pixel includes: an organic light emitting diode; a first transistor for controlling an amount of current flowing from a first power source to a second power source via the organic light emitting diode; a storage capacitor coupled between the first power source and a gate electrode of the first transistor; a plurality of third transistors coupled between the gate electrode and a second electrode of the first transistor; and a plurality of fourth transistors coupled between the gate electrode of the first transistor and an initialization power source. The third and fourth transistors are configured to reduce a leakage current from the storage capacitor to improve the image quality of the display. | 06-30-2011 |
20110164016 | PIXEL CIRCUIT, ORGANIC LIGHT EMITTING DISPLAY, AND DRIVING METHOD THEREOF - A pixel circuit includes: an OLED; a second transistor including gate, first, and second terminals coupled to a first scan line, a data line, and a first node, respectively; a fourth transistor including gate, first, and second terminals coupled to a third scan line, the first node, and a second node, respectively; a third transistor including gate, first, and second terminals coupled to a second scan line, a reference power source, and the second node, respectively; a fifth transistor including gate, first, and second terminals coupled to a light emission control line, a third node, and an anode of the OLED, respectively; a first capacitor coupled between the first and second nodes; a second capacitor coupled between the second and third nodes; and a first transistor including gate, first, and second terminals coupled to the first node, a first power source, and the third node, respectively. | 07-07-2011 |
20110164071 | PIXEL CIRCUIT, ORGANIC ELECTRO-LUMINESCENT DISPLAY APPARATUS, AND METHOD OF DRIVING THE SAME - A pixel circuit includes a light emitting device, an N-type driving transistor for outputting a driving current according to a voltage applied to the gate electrode, a first capacitor coupled to a gate electrode of the driving transistor, a second capacitor including a first terminal coupled to the gate electrode of the driving transistor and a second terminal coupled to the first electrode of the light emitting device, and second through sixth N-type transistors. An initialization period is reduced for a driving operation and the threshold voltage compensation time of a driving transistor is controlled. | 07-07-2011 |
20110187691 | SCAN DRIVER AND FLAT PANEL DISPLAY APPARATUS INCLUDING THE SAME - A scan driver and a flat panel display apparatus including the scan driver. The scan driver includes a plurality of scan stages, wherein two transistors are coupled between each scan stage such that the scan driver is capable of performing progressive scanning or interlaced scanning. | 08-04-2011 |
20110193850 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - There is provided an organic light emitting display device for providing a compensation period of a threshold voltage. The organic light emitting display device includes: a scan driver configured to supply a plurality of scan signals to a plurality of scan lines, each of the scan signals having a width greater than two horizontal periods; a data driver configured to supply a plurality of data signals to a plurality of data lines; and a pixel including an organic light emitting diode, a pixel circuit having a first transistor for controlling an amount of current supplied to the organic light emitting diode, and a compensation circuit configured to control a voltage of a gate electrode of the first transistor to compensate for deterioration of the organic light emitting diode; wherein the scan driver is configured to supply a current scan signal which partially overlaps in time with a previous scan signal. | 08-11-2011 |
20110199357 | ORGANIC LIGHT EMITTING DISPLAY DEVICE - An organic light emitting display device includes a scan driver, a data driver, and pixels. The scan driver is for sequentially supplying, during each horizontal period of a width 1H, a scan signal with a width of at least 2H to scan lines. The scan driver is further for sequentially supplying an emission control signal to emission control lines that are substantially parallel to the scan lines. The data driver supplies data signals to data lines. Each pixel includes an organic light emitting diode (OLED), a pixel circuit having a first transistor for controlling the amount of current supplied to the OLED, and a compensator for controlling the voltage of a gate electrode of the first transistor for compensating a degradation of the OLED. The compensator includes two transistors and a capacitor. One transistor is coupled to a scan line, and the other is coupled to an emission control line. | 08-18-2011 |
20110199358 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A pixel and an organic light emitting display device using the same are provided. The pixel includes an organic light emitting diode. A first transistor has a second electrode coupled to the organic light emitting diode, and controls the amount of current supplied to the organic light emitting diode. A third transistor is coupled between a reference power source and a first node, and is turned on when a scan signal is supplied to a scan line. A second transistor is turned on when the scan signal is supplied to the scan line, and electrically couples a data line to a second node. A fourth transistor is coupled between the first and second nodes, and is turned off when an emission control signal is supplied to an emission control line. A storage capacitor is coupled between the second node and a first electrode of the first transistor. | 08-18-2011 |
20110227885 | Pixel and Organic Light Emitting Display Device Using the Same - An organic light emitting display device includes: a scan driver for supplying partially overlapping scan signals having at least 2H width and for supplying emission control signals; a data driver; and pixels, each including: an OLED having a cathode coupled to second power; a first transistor having a first electrode coupled to first power; a second transistor between a gate electrode and a second electrode of the first transistor and turned on when the scan signal is supplied to a current scan line; a third transistor between the data line and a second node and turned on when the scan signal is supplied to a subsequent scan line; a first capacitor coupled between the first transistor gate electrode and the second node; and a fourth transistor turned on when the scan signal is supplied to a previous scan line to supply a first voltage to the first transistor gate electrode. | 09-22-2011 |
20110273407 | SCAN DRIVER, METHOD OF DRIVING THE SCAN DRIVER, AND ORGANIC LIGHT-EMITTING DISPLAY INCLUDING THE SCAN DRIVER - A scan driver includes a plurality of stages and is capable of overlapped driving of scan signals output by each of the stages. A method of driving the scan driver, and an organic light emitting display device including the scan driver, is provided. | 11-10-2011 |
20110273421 | SCAN DRIVING CIRCUIT AND DISPLAY APPARATUS USING THE SAME - A scan driving circuit that generates a plurality of scan signals overlapping with each other by h horizontal cycles, that is driven by using (2h+2) clock signals, and that includes a small number of transistors, where h denotes a natural number less than or equal to nā1 and n is an integer greater than ā4.ā | 11-10-2011 |
20120038609 | Driver and Display Device Using the Same - A driving device comprises: a first driver driven by a first input signal and generating a first interim output signal controlled by a first clock signal; a second driver driven by a second input signal and generating a second interim output signal controlled by a second clock signal; and a plurality of shift registers including a buffer driven by the first interim output signal and the second interim output signal and generating an output signal controllable by the first clock signal and the second clock signal. The buffer includes a second transistor connected to a gate electrode of a first transistor for transmitting a voltage with a first level with the output signal and transmitting a voltage with a second level for turning off the first transistor. | 02-16-2012 |
20120038612 | ORGANIC LIGHT EMITTING DISPLAY DEVICE - An organic light emitting display includes: pixels located at crossing regions between scan lines and data lines; a first control line and a second control line commonly coupled to the pixels; a control line driver configured to supply a first control signal to the first control line for a reset period and to supply a second control signal to the second control line during the reset period and a compensation period. Each pixel includes: an organic light emitting diode; a first transistor configured to control an amount of current supplied from a first power source coupled to a first electrode to a second power source via the organic light emitting diode; a second transistor configured to be turned on when the second control signal is supplied; and a fourth transistor configured to supply an initial voltage to a second electrode of the first transistor when the first control signal is supplied. | 02-16-2012 |
20120038617 | ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - There is provided an organic light emitting display device including: pixels positioned at crossing regions of scan lines and data lines; a first control line and a second control line commonly coupled to the pixels; and a control line driver for supplying a first control signal to the first control line for a reset period and for supplying a second control signal to the second control line for a compensation period, wherein each of the pixels includes: an organic light emitting diode; a first transistor for controlling an amount of current supplied from a first power source to a second power source; a second transistor configured to turn on when the second control signal is supplied; and a fourth transistor for supplying an initial voltage to a gate electrode of the first transistor when the first control signal is supplied. | 02-16-2012 |
20120075259 | Scan Driver and Driving Method Thereof - A scan driver comprises a plurality of scan driving blocks which include a sequential input terminal, a first clock signal input terminal, a second clock signal input terminal, an inverse-output input terminal, and a signal output terminal. The scan driving blocks each include: a first block for receiving a frame start signal or an output signal of an adjacent scan driving block through the sequential input terminal, for receiving a first clock signal through the first clock signal input terminal, for receiving a second clock signal having an inverse-phase voltage level of the first clock signal through the second clock signal input terminal so as to output a first output signal to the signal output terminal; and a second block for receiving the first output signal through the sequential input terminal, for receiving the second clock signal through the first clock signal input terminal, and for receiving the first clock signal through the second clock signal input terminal so as to output a second output signal to the signal output terminal. | 03-29-2012 |
20120081409 | DRIVER AND DISPLAY DEVICE INCLUDING THE SAME - The present invention relates to a driver and a display device including the same, wherein the driver includes: a first driving circuit generating a first output signal; a second driving circuit generating a second output signal; and at least one buffer circuit generating a third output signal of a voltage level corresponding to a gate-on voltage level of the first output signal or the second output signal when the first output signal or the second output signal is transmitted as a gate-on voltage level, and the buffer circuit includes a first transistor transmitting the voltage of the first level as the third output signal, and a second transistor transmitting the voltage of a second level turning off the first transistor and connected to the gate electrode of the first transistor. | 04-05-2012 |
20120105399 | ORGANIC LIGHT EMITTING DISPLAY DEVICE - An organic light emitting display device for improving the yield and for reducing or minimizing manufacturing costs. The organic light emitting display device includes: a data driver coupled to data lines that are formed on the panel; a scan driver mounted on the panel and coupled to scan lines that are formed on the panel; input lines for receiving clock signals from the outside; first connecting lines overlapped with a cathode electrode and electrically coupled to the input lines and for supplying the clock signals to the scan driver; second connecting lines electrically coupled to the input lines; and third connecting lines for electrically coupling the first connecting lines to the second connecting lines. | 05-03-2012 |
20120105423 | Scan Driver and Display Device Comprising the Same - A scan driver and a display device including the same. The scan driver includes a plurality of shift registers including an input signal terminal into which an initial signal or an output signal of a previous stage is inputted, two clock signal terminals to which 2 phase clock signals are transferred, two control signal terminals to which a first control signal and a second control signal controlling a driving mode of simultaneously driving or sequentially driving output signals of all stages are transferred, and output signals terminals from which the output signals are outputted, wherein in the sequential driving mode, the first control signal and the second control signal are transferred as a predetermined first level voltage and in the simultaneous driving mode, the first control signal and the second control signal are transferred alternately as the first level voltage and a predetermined second level voltage. | 05-03-2012 |
20120139962 | DISPLAY DEVICE, SCAN DRIVER FOR A DISPLAY DEVICE, AND A DRIVING METHOD THEREOF - A scan driver may include: a first scan driving block, outputting a second clock signal to a first output terminal according to an input signal, in synchronization with a first clock signal; and a second scan driving block, outputting the first clock signal according to the output signal of the first scan driving block to a second output terminal, in synchronization with the second clock signal, wherein the first scan driving block and the second scan driving block simultaneously output an entire clock signal, according to a level of a simultaneous light emission control signal. | 06-07-2012 |
20130002307 | STAGE CIRCUIT AND SCAN DRIVER USING THE SAME - A stage circuit and a scan driver using the same that is capable of concurrently (e.g., simultaneously) or progressively supplying a scan signal to a plurality of scan lines. The stage circuit includes a progressive driver and a concurrent driver. | 01-03-2013 |
20130002340 | STAGE CIRCUIT AND SCAN DRIVER USING THE SAME - A stage circuit is capable of concurrently or progressively supplying scan signals. The stage circuit includes a progressive driver including a first transistor and a second transistor, and a concurrent driver including an 11 | 01-03-2013 |
20130120326 | SCAN DRIVING DEVICE AND METHOD OF DRIVING THE SAME - A scan driving device includes scan driving blocks, each including: a first node receiving a signal that is input to a first driving signal input terminal according to a clock signal input to a first clock signal input terminal; a second node receiving a second power source voltage according to the clock signal input to the first clock signal input terminal and a signal input to a second driving signal input terminal; a first transistor including a gate electrode connected to the second node and an electrode receiving an output control signal; a second transistor including a gate electrode connected to the first node and an electrode connected to a second clock signal input terminal; and a third transistor including a gate electrode connected to the second node, an electrode connected to a first power source voltage, and another electrode connected to the first node. | 05-16-2013 |
20130127805 | SCAN DRIVING DEVICE AND DRIVING METHOD THEREOF - A scan driving apparatus includes a plurality of sequentially arranged scan driving blocks, each including: a first node configured to receive a first clock signal; a second node configured to receive an input signal according to a second clock signal input; a first transistor having a gate electrode coupled to the first node, a first electrode configured to receive a power source voltage, and a second electrode coupled to an output terminal; and a second transistor having a gate electrode coupled to the second node, a first electrode for receiving a third clock signal, and a second electrode coupled to the output terminal. Each scan driving block is configured to receive the first, second, and third clock signals as a corresponding three clock signals among four clock signals sequentially shifted by a first period, and to output the third clock signal by being synchronized with the input signal. | 05-23-2013 |
20130127807 | SCAN DRIVER AND DRIVING METHOD THEREOF - A scan driver including sequentially arranged scan driving blocks, each of the blocks including a first node receiving a signal input into a driving signal input terminal based on a clock signal input into a second-clock-signal input terminal, a second node receiving a clock signal input into a first-clock-signal input terminal, a first transistor including a gate electrode connected to the second node, one electrode receiving an output control signal, and another electrode connected to an output terminal, a second transistor including a gate electrode connected to the first node, one electrode connected to a third-clock-signal input terminal, and another electrode connected to the output terminal, and a third transistor including a gate electrode connected to the third-clock-signal input terminal and one electrode connected to the first node and configured to transfer a voltage of the output terminal to the first node. | 05-23-2013 |
20140125648 | GATE DRIVER, METHOD OF DRIVING DISPLAY PANEL USING THE SAME AND DISPLAY APPARATUS HAVING THE SAME - A gate driver includes a plurality of stages respectively outputting a plurality of gate output signals. An N-th stage of the gate driver (where N is a positive integer) includes a first input part, a second input part, a pull up part, a pull down part, a holding part and a stabilizing part. The first input part transmits a first clock signal to a second node in response to a signal at a first node. The second input part transmits an input signal to the first node in response to a second clock signal. The pull up part pulls up the gate output signal in response to a signal at the second node. The pull down part pulls down the gate output signal in response to the signal at the first node. The holding part maintains the signal at the second node in response to the first clock signal. The stabilizing part stabilizes the gate output signal in response to the signal at the second node and a third clock signal. | 05-08-2014 |
20140125713 | DATA DRIVER, ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME, AND METHOD OF DRIVING THE ORGANIC LIGHT EMITTING DISPLAY DEVICE - A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness. | 05-08-2014 |
20140139408 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY USING THE SAME - A pixel includes an organic light emitting diode (OLED), a first transistor having a gate electrode coupled to a first node, a first electrode coupled to a first power supply, and a second electrode coupled to the OLED, a first capacitor for storing a data signal, and a second capacitor coupled between the first node and the second electrode of the first transistor to charge a voltage corresponding to the data signal and a threshold voltage of the first transistor, wherein, in a period where a voltage stored in the first capacitor is supplied to the first node, the second capacitor is electrically blocked from the first node. | 05-22-2014 |
20140168179 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY USING THE SAME - An organic light emitting display capable of improving display quality. The organic light emitting display includes a data driver for supplying bias power supply to data lines in a first period of one frame, for supplying reference power supply in a second period, and for supplying data signals in a fourth period, a scan driver for sequentially supplying scan signals to scan lines in the fourth period, pixels positioned at intersections of the scan lines and the data lines, and a first control line, a second control line, a third control line, and a fourth control line commonly coupled to the pixels. Each of the pixels includes a first capacitor for previously charging voltages corresponding to the data signals and a second capacitor charged by a voltage of the first capacitor in a third period between the second period and the fourth period. | 06-19-2014 |
20140198085 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY USING THE SAME - A pixel includes an organic light emitting diode, a first driver and a second driver. The second driver controls an amount of current supplied from a first power source to the organic light emitting diode, corresponding to a previous data signal. The first driver stores a current data signal supplied from a data line and supplies the previous data signal to the second driver. In the pixel, the second driver includes a sixth transistor coupled between an initialization power source and a first node coupled to a gate electrode of a first transistor, the sixth transistor being configured to turn on when a first control signal is supplied; and a seventh transistor coupled between the first power source and a second node commonly coupled to the first and second drivers, the seventh transistor being configured to turn on when the first control signal is supplied. | 07-17-2014 |
20140210807 | CIRCUIT FOR PREVENTING STATIC ELECTRICITY AND DISPLAY DEVICE HAVING THE SAME - A static electricity prevention circuit of a display device including: a driving circuit configured to drive a display unit that displays an image, at least one clock signal wire configured to transmit a clock signal to the driving circuit, at least one transistor electrically coupled to the dock signal wire, and at least one capacitor including a first electrode coupled to a source electrode and to a drain electrode of the transistor, and a second electrode configured to be maintained at a voltage, | 07-31-2014 |
20140333512 | PIXEL AND ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE USING THE SAME - A pixel circuit for an organic light emitting diode (OLED) display is disclosed. One inventive aspect includes an organic light emitting diode, a first transistor, a storage unit, a second transistor and a third transistor. The first transistor controls the amount of current flowing from a first power source coupled to a second power source via a second node and the organic light emitting diode in response to a voltage at a first node. The storage unit is connected to a data line, and stores a data signal from the data line. The second transistor is connected to a fourth node and the first node and is turned on when a second control signal is supplied. The third transistor is connected to the first node and a third node and is turned on when a third control signal is supplied. | 11-13-2014 |
20140333600 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY USING THE SAME - A pixel circuit for an organic light emitting diode (OLED) display is disclosed. One inventive aspect includes an organic light emitting diode, a first transistor, a second transistor, a first capacitor connected to a second node and a fixed voltage source, a third transistor, a fourth transistor, a second capacitor connected to the fourth transistor and a third node, a first control transistor and a second control transistor. The fourth transistor is connected to the first and third nodes and is turned off when an emission control signal is supplied to an emission control line and turned on otherwise. The first control transistor is connected to the third node and the first power source and is turned on when a first control signal is supplied. | 11-13-2014 |
20140353605 | THIN FILM TRANSISTOR AND ORGANIC LIGHT EMITTING DIODE DISPLAY INCLUDING THE SAME - A thin film transistor includes a substrate, a semiconductor layer on the substrate, a first insulating layer covering the substrate and the semiconductor layer, a first gate electrode on the first insulating layer and overlapping the semiconductor layer, a second insulating layer covering the first gate electrode and the first insulating layer, a second gate electrode on the second insulating layer and overlapping the semiconductor layer and the first gate electrode, a third insulating layer covering the second gate electrode, a first contact hole defined in the first insulating layer, the second insulating layer and the third insulating layer, and through which a portion of the semiconductor layer is exposed, and a source electrode and a drain electrode connected to the semiconductor layer through the first contact hole. | 12-04-2014 |
20140353608 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - There is provided a pixel, including an organic light emitting diode (OLED), a first transistor whose gate electrode is coupled to a first node, whose first electrode is coupled to a first power supply via a third node, and whose second electrode is coupled to an anode electrode of the OLED, a second transistor coupled between a data line and a second node and turned on when a scan signal is supplied to a scan line, a first capacitor coupled between the second node and a first voltage source, a third transistor coupled between the second node and the first node and turned on when a second control signal is supplied, and a fourth transistor coupled between the first node and the first power supply and turned on when a first control signal is supplied. | 12-04-2014 |
20140354517 | PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A pixel includes an organic light emitting diode (OLED) having a cathode electrode coupled to a second power supply, a pixel circuit configured to control an amount of current supplied to the OLED to correspond to a previous data signal, and a driver configured to store a present data signal supplied from a data line and to supply the previous data signal to the pixel circuit. The OLED, pixel circuit, and driver may be controlled by signals in a frame that includes first through fourth periods, the second power supply may be set to a first voltage in the first and second periods and to a second voltage in the third and fourth periods, and the first voltage may be a voltage at which the OLED does not emit light and the second voltage may be a voltage at which the OLED emits light. | 12-04-2014 |
20140354522 | DISPLAY DEVICE AND DRIVING METHOD THEREOF - A method of driving an OLED display includes: during a scanning period of a first frame, turning off a relay transistor and turning on a switching transistor to enable a second data voltage applied to a data line to be stored in a first capacitor; and during a light emitting period of the first frame, performing an operation to turn on a light emitting transistor and a compensation transistor to enable a voltage into which a first data voltage and a threshold voltage of a driving transistor are reflected to be applied to a second node for enabling the OLED to emit light by a driving current which flows into a driving transistor. The scanning period and the light emitting period temporally overlap each other. | 12-04-2014 |
20140354711 | ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHOD OF DRIVING THE SAME - An organic light emitting display device includes pixels, a scan driver, a memory configured to store pixel data containing information indicative of threshold voltages and mobilities of first transistors in the pixels, a timing controller configured to modify one or more bits of first data to generate second data, the first data modified in response to the pixel data, a data driver configured to generate data signals based on the second data, and a control driver configured to supply a first control signal to a first control line commonly coupled to the pixels and a second control signal to a second control line, wherein each of the pixels is configured to store a data signal of a current frame and to emit light corresponding to a data signal of a previous frame. | 12-04-2014 |
20150021591 | THIN FILM TRANSISTOR AND THIN FILM TRANSISTOR ARRAY PANEL INCLUDING THE SAME - A thin film transistor is disclosed. In one aspect, the thin film transistor includes a substrate, a semiconductor layer formed on the substrate, and a first gate electrode substantially overlapping the semiconductor layer with a gate insulating layer interposed therebetween. The thin film transistor also includes a second gate electrode substantially overlapping the first gate electrode with an interlayer insulating layer interposed therebetween, and a source electrode and a drain electrode electrically connected to the semiconductor layer, wherein the first gate electrode is electrically connected to the second gate electrode. | 01-22-2015 |
20150035732 | STAGE AND ORGANIC LIGHT EMITTING DISPLAY DEVICE USING THE SAME - A stage includes an output unit configured to supply a scan signal to an output terminal according to voltages of first and second nodes; a first driver configured to control the voltages of the first and second nodes so that when a start signal or an output signal of a previous stage is supplied to a first input terminal, the scan signal is supplied from the output unit; and a second driver configured to control the voltages of the first and second nodes, corresponding to signals supplied to a second input terminal, a fourth input terminal and a fifth input terminal, wherein the second driver comprises eighth and ninth transistors coupled in series between the output terminal and the second node, and wherein a gate electrode of the eighth transistor is coupled to the first node, and a gate electrode of the ninth transistor is coupled to the fourth input terminal. | 02-05-2015 |