Patent application number | Description | Published |
20120162175 | PIXEL UNIT OF ORGANIC LIGHT EMITTING DIODE AND DISPLAY PANEL USING THE SAME - A pixel unit for driving an organic light emitting diode (OLED) is disclosed. The pixel unit includes a driving transistor, a compensating capacitor, a selecting switch module, a power switch and a configuration switch. One terminal of the compensating capacitor is coupled to a gate of the driving transistor. The selecting switch module provides the ground voltage or the compensating voltage to the other terminal of the compensating capacitor according to a first control signal. The power switch is coupled between a power voltage and a drain of the driving transistor and is controlled by a second control signal. The configuration switch receives the first control signal for controlling a connecting configuration of the driving transistor. The pixel unit is driven according to the first and the second control signals for compensating threshold voltage shifting of the OLED and the driving transistor. | 06-28-2012 |
20130069537 | PIXEL CIRCUIT AND DRIVING METHOD THEREOF - The disclosure relates to a pixel circuit which includes an LED, a storage capacitor, a driving transistor, and first to third switching transistors. The driving transistor is utilized to control connection/disconnection between a power supply voltage and the LED. The first switching transistor receives a first scanning signal for controlling connection/disconnection between a gate of the driving transistor and the power supply voltage. The second switching transistor receives a second scanning signal for controlling connection/disconnection between the storage capacity and a ground voltage. The third switching transistor receives the first scanning signal for controlling connection/disconnection between the storage capacity and a data voltage. The first scanning signal and the second scanning signal are in antiphase to each other. A driving method thereof is also disclosed. | 03-21-2013 |
20130201086 | ACTIVE LIGHT EMITTING DEVICE - An active light emitting device disposed on a substrate is provided. The active light emitting device includes a scan line, a data line, a power line, a circuit unit, and a light emitting unit. The circuit unit is connected to the scan line, the data line, and the power line. The circuit unit at least includes an overlapping component which is at least partially overlapped with the power line. The light emitting unit is driven by the circuit unit. A light emitting region and a circuit region on the substrate are defined respectively by the light emitting unit and the circuit unit. | 08-08-2013 |
20130271501 | ORGANIC LIGHT EMITTING DIODE DISPLAY AND OPERATING METHOD THEREOF - An organic light emitting diode (OLED) display and an operating method thereof are provided. The organic light emitting diode display includes an organic light emitting diode display panel and a driving circuit. The organic light emitting diode display panel has a plurality of pixels. The driving circuit is coupled to the organic light emitting display panel and receives a primitive display frame. The driving circuit generates a first frame and a second frame corresponding to the primitive display frame by a polarity inverting means, and outputs a zero gray-level pixel voltage to the corresponding pixels of the organic light emitting diode display panel corresponding to a negative polarity data of the first frame and the second frame, wherein the second frame is adjacent to the first frame. | 10-17-2013 |
20130335394 | DRIVING CIRCUIT OF AN ORGANIC LIGHT EMITTING DEVICE AND METHOD OF OPERATING A DRIVING CIRCUIT OF AN ORGANIC LIGHT EMITTING DEVICE - A driving circuit of an organic light emitting device includes a switch module, a capacitor, and a driving unit. The switch module includes a first switch unit and a second switch unit. The first switch unit is coupled to a data line. The second switch unit is coupled to the organic light emitting device. During a programming period, the first switch unit is turned on and the second switch unit is turned off; and during an emission period, the first switch unit is turned off and the second switch unit is turned on. The capacitor is coupled to the first switch unit for being charged to a data voltage according to a data current of the data line during the programming period. The driving unit is used for generating a driving current to drive the organic light emitting device according to the data voltage during the emission period. | 12-19-2013 |
20140085284 | ORGANIC LIGHT EMITTING DIODE DISPLAY APPARATUS - An organic light emitting diode (OLED) display apparatus includes a power circuit and a pixel. The power circuit serves to provide a first voltage. The pixel includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a capacitor, and an OLED. During a programming period, a first terminal of the capacitor receives a data voltage through the turned-on first transistor, a first terminal of the second transistor receives the first voltage, a control terminal of the second transistor is coupled to a second terminal of the capacitor and coupled to a second terminal of the second transistor through the turned-on third transistor, and the power circuit regulates a voltage level or a current of the first voltage to accelerate a voltage level of the control terminal of the second transistor to reach a target voltage. | 03-27-2014 |
20140209868 | ORGANIC LIGHT EMITTING DIODE DISPLAY APPARATUS AND PIXEL CIRCUIT THEREOF - An organic light emitting diode display apparatus and a pixel circuit thereof are provided. The pixel circuit includes a switch unit, a capacitor, a first transistor, a second transistor, a third transistor and an organic light emitting diode. In a pre-charging period, a first terminal of the capacitor receives a data voltage through the switch unit, and a second terminal of the capacitor receives a high voltage through the turned-on first transistor. In a programming period, the first terminal of the capacitor receives the data voltage through the switch unit, and the second terminal of the capacitor receives the high voltage that is encoded through the turned-on second and third transistors. In a display period, the first terminal of the capacitor receives a ground voltage through the switch unit, and the first and third transistors are turned-off. | 07-31-2014 |
20140362068 | DRIVING CIRCUIT - A driving circuit includes a first transistor, a capacitor, a second transistor, and a charging circuit. The input terminal of the first transistor is electrically connected to a voltage source. The output terminal of the first transistor is electrically connected to an organic light-emitting diode. The first terminal of the capacitor is electrically connected to the control terminal of the first transistor. The input terminal of the second transistor is electrically connected to the second terminal of the capacitor. The control terminal of the second transistor is electrically connected to a scan line. The output terminal of the second transistor is electrically connected to the output terminal of the first transistor. The charging circuit is electrically connected to the first and second terminals of the capacitor, the scan line, and a current source. | 12-11-2014 |
20150049006 | PIXEL CIRCUIT OF ORGANIC LIGHT EMITTING DIODE - A pixel circuit of an organic light emitting diode (OLED) is provided. The pixel circuit includes an OLED, a first transistor, a second transistor and a capacitor. The OLED receives a first voltage. A terminal of the first transistor is coupled to the OLED, and another terminal of the first transistor receives a second voltage. A terminal of the second transistor is coupled to the terminal of the first transistor, another terminal of the second transistor is coupled to a control terminal of the first transistor, a control terminal of the second transistor receives a scan signal. The capacitor is coupled between the control terminal of the first transistor and a third voltage. When the scan signal is enabled, the second voltage is set to a data voltage, the third voltage is set to a reference voltage, and the first voltage is set to a low voltage. | 02-19-2015 |
20150049007 | PIXEL DRIVING CIRCUIT OF ORGANIC-LIGHT EMITTING DIODE - A pixel driving circuit of an organic light emitting diode includes a first transistor including a first terminal, a control terminal and a second terminal and a capacitor including a first terminal and a second terminal. The first terminal and the second terminal of the capacitor are electrically coupled to the first terminal and the control terminal of the first transistor at a first node and a second node respectively. In a first period, a power source does not provide a power supply voltage to the first node, and a data voltage and a variable voltage are written in the first node and the second node respectively. In a second period, the power source provides the power supply voltage to the first node. The first transistor provides a driving current to an organic light emitting diode based on the voltage of the first node and the second node. | 02-19-2015 |