Au Optronics Corporation

Tpo Displays Corporation

Chimei Innolux Corporation

Chun-Yen Liu

Chia-Yuan Yeh

Cheng-Chieh Tseng

Chang-Ho Tseng

Sen-Chuan Hung

Hsuan-Ming Tsai

Guan-Ru Huang

Chin-Sheng Yang

Shih-Chang Chang

Yuan-Chun Wu

Kai-Teng Shih

Chen-Hao Kuo

Sheng-Han Li

Yi-Fan Shih

Kuo-Bin Hsu

A pixel circuit includes a driving unit, a light emitting unit having a second terminal receiving a second voltage, a compensation capacitor, and first, second and third switches. The first switch has a first terminal connected to the driving unit, and a control terminal for receiving a first control signal. The second switch has a first terminal coupled to the second terminal of the first switch, a second terminal for receiving an initialization signal, and a control terminal for receiving the first control signal. The compensation capacitor has a first terminal coupled to the second terminal of the first switch, and a second terminal coupled to the first terminal of the light emitting unit. The third switch has a first terminal connected to the driving unit, a second terminal coupled to the first terminal of the light emitting unit, and a control terminal for receiving a light emission control signal.

Pixel circuit and driving method thereof

A pixel driving circuit includes first to seventh switches, a capacitor and a light emitting unit. The first and sixth switches are connected and receive data voltage and second reference voltage according to second and third control signals, respectively. One capacitor end connects to the serial-connected first and sixth switches and the other capacitor end connects to a control end of the second switch. The serial-connected third and fourth switches are connected between the control and first end of the second switch. The third and fourth switches are ON by the second control signal. The fifth switch is ON by a first control signal. An end of the fifth switch connects to the serial-connected third and fourth switches and another end receives a first reference voltage. The seventh switch is connected between the second switch and the light emitting unit. The seventh switch is ON by the third control signal.

Pixel driving circuit

A pixel structure and a driving method thereof are disclosed. The pixel structure includes a first capacitor, an input unit, a compensation unit, a pixel driving unit, a resetting unit, a light-emitting diode, a light-emitting activation unit and a coupling unit. The input unit controls a voltage on a first terminal of the first capacitor according to a first scanning signal and a data signal. The compensation unit coupled to the first capacitor is configured to control voltages on the terminals of the first capacitor according to a second scanning signal. The pixel driving unit is configured to provide a driving current to the light-emitting diode according to a first reference voltage and the voltage on a second terminal of the first capacitor. The coupling unit is coupled to the light-emitting activation unit, the first terminal of the first capacitor, the input unit and the compensation unit.

Pixel structure with compensation function, and driving method thereof

An active matrix organic light emitting diode (AMOLED) circuit and an operating method thereof are disclosed herein. The AMOLED circuit includes an organic light emitting diode, a switching circuit, a compensating circuit, a driving circuit, and a reset circuit. The compensating circuit is connected to the switching circuit and includes a first capacitor. The driving circuit is configured to be driven by the compensating circuit to provide the organic light emitting diode with a driving current. The reset circuit is connected to both ends of the first capacitor and to a control line. The reset circuit is configured to change the voltage levels on both ends of the first capacitor according to the voltage level on the control line, such that one end of the first capacitor and a reference power supply are conducted and charges stored inside the first capacitor are released.

Active matrix organic light emitting diode circuit and operating method of the same

A pixel structure including a first scan line, a second scan line, a data line and a power line substantially perpendicular to the first scan line and the second scan line, a reference signal line and an emission signal line substantially parallel with the first scan line and the second scan line, a common thin film transistor (C-TFT), a first pixel unit, and a second pixel unit is provided. The common thin film transistor has a common gate electrode, a common source electrode and a common drain electrode. The common gate electrode is electrically connected to the first scan line, the common drain electrode is electrically connected to the reference signal line. The first and the second pixel units respectively have a first TFT, a second TFT, a third TFT, a fourth TFT, a fifth TFT, a sixth TFT, a capacitor, and an emission device.

Pixel structure of organic light emitting device

A shift register circuitry includes plurality stages of shift registers. An Nth stage shift register of the plurality stages of shift registers includes an input unit, an output unit, a control unit, a first pull-up unit, a second pull-up unit and a compensation circuit. The output unit is used to output an unmodified Nth stage scan signal. The input unit and the first pull-up unit are used to control the voltage level of a register control end. The control unit is used to receive a low reference voltage, a high reference voltage and the voltage level of the register control end, and control the voltage level of an output end of the control unit. The second pull-up unit is used to control the voltage level of an output end of the Nth stage shift register. The modification circuit is used to generate a modified Nth stage scan signal.

Shift register circuitry, display and shift register

A pixel driving circuit of an organic light emitting diode (OLED) includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a capacitor, and an OLED. The operation of the pixel driving circuit includes three stages including discharging, data writing, and emitting. The pixel driving circuit compensates the threshold voltage of the transistor in the stage of data writing, so the driving current of the OLED can be irrelevant to the variations of threshold voltages.

Pixel driving circuit of an organic light emitting diode

A pixel circuit of a light emitting diode display includes a light emitting diode, six transistors and two capacitors. The effect of the variation of the threshold voltage of the transistor in the pixel circuit on the display quality can be improved through supplying specific the first to fourth control signals and the first to third reference voltages to the pixel circuit. A light emitting diode display using the aforementioned pixel circuit and a driving method of the aforementioned pixel circuit are also provided.

Pixel circuit, light emitting diode display using the same and driving method thereof

A pixel structure including a semiconductor layer having at least one source region and at least one drain region; a first insulating layer covering the semiconductor layer; a first conductive layer on the first insulating layer and including at least one gate; a second insulating layer covering the first conductive layer; a second conductive layer on the second insulating layer and including at least one source electrode, at least one drain electrode and at least one bottom electrode, the source region, the source electrode, the drain region, the drain electrode and the gate forming at least one thin film transistor; a third insulating layer covering the second conductive layer; a third conductive layer on the third insulating layer and including at least one top electrode, the top electrode and the bottom electrode forming at least one capacitor; and a pixel electrode electrically connected to the thin film transistor.

Pixel structure

An organic light emitting display includes scan lines, row common electrodes and rows of pixels. The scan lines sequentially transmit scan signals. The row common electrodes disposed in parallel with the scan lines and sequentially transmit common voltage signals corresponding to the scan signals. The rows of the pixels are electrically coupled to the scan lines and the row common electrodes and sequentially receive the scan signals and the common voltage signals. A method for driving the organic light emitting display is also disclosed herein.

Organic light emitting display and method for driving the same

An exemplary pixel circuit includes an OLED, a storage capacitor, a driving transistor and first through fourth switching transistors. The driving transistor is for driving the OLED at a predetermined brightness. The first source/drain electrode of the driving transistor is coupled to a terminal of the storage capacitor, the second source/drain electrode is coupled to the OLED, and the gate electrode is coupled to receive a data voltage through the first switching transistor. Gate-on voltages of the first and second switching transistors are in opposite phases to each other, and the first and second switching transistors are controlled by the same control signal. Likewise, gate-on voltages of the third and fourth switching transistors are in opposite phases to each other, and the third and fourth switching transistors are controlled by the same control signal. A pixel driving method is also disclosed.

Pixel driving method of active matrix organic light emitting diode display

A pixel driving circuit of an organic light emitting diode includes a first switch, a capacitor, a transistor, a second switch, a third switch and an organic light emitting diode. The operation of the pixel driving circuit includes three stages of resetting, data writing, and emitting. The pixel driving circuit is able to reset the transistor for de-trapping holes at stages of resetting and data writing. The image retention caused by the transistor hysteresis may be improved.

An organic light emitting display (OLED) includes a voltage adjustment unit for adjusting a preliminary control voltage according to a second reference voltage, a couple unit for coupling a change of the preliminary control voltage to adjust a control voltage, a driving unit for providing a driving current and a driving voltage according to the control voltage, a first reset unit for resetting the driving voltage according to a first reference voltage, a second reset unit for resetting the control voltage according to the driving voltage, an organic light emitting diode for generating output light according to the driving current, and an emission enable unit for providing a control of furnishing the driving current to the organic light emitting diode. Through the circuit operation of the reset units and the voltage adjustment unit, occurrences of image retention phenomenon and pixel brightness distortion on the OLED screen can be avoided.

Growing community of inventors

Hsin-Chu, Taiwan

Chun-Yen Liu