AMOLED pixel driving circuit, pixel driving method, and display panel
AssigneeShenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
InventorYan Xue
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Abstract
An active matrix organic light emitting diode (AMOLED) pixel driving circuit, pixel driving method, and a display panel are provided. All or part of the thin film transistors, which assist to store data voltage stably in the storage capacitor, prevent flickering of the display panel caused by data loss, and thereby improve the display effect and quality of the display panel.
Claims14
An active matrix organic light emitting diode (AMOLED) pixel driving circuit, wherein all or part of thin film transistors of the AMOLED pixel driving circuit are dual-gate thin film transistors to adjust threshold voltages of the thin film transistors in the AMOLED pixel drive circuit, wherein the AMOLED pixel drive circuit includes:
- a first thin film transistor, wherein a top gate of the first thin film transistor is connected to a first circuit node, a first electrode is connected to receive a power voltage, and a second electrode is connected to a second circuit node;
- a second thin film transistor, wherein a top gate of the second thin film transistor is connected to receive a first scanning signal, a third electrode is connected to receive a data voltage, and a fourth electrode is connected to the first circuit node;
- a third thin film transistor, wherein a top gate of the third thin film transistor is connected to receive a second scanning signal, a fifth electrode is connected to the second circuit node, and a sixth electrode is connected to receive a reference voltage;
- a capacitor, wherein one end is connected to the first circuit node, and the other end is connected to the second circuit node;
- and
- an organic light emitting diode, wherein an anode of the organic light emitting diode is electrically connected to the second circuit node, and a cathode is connected to receive a common ground voltage;
- wherein at least one of the second thin film transistor and the third thin film transistor is a dual-gate thin film transistor;
- wherein the pixel driving circuit includes a first reset and data writing stage:
- when the pixel driving circuit is in the first reset and data writing stage, the first scanning signal and the second scanning signal are at a high potential, the second thin film transistor and the third thin film transistor are turned-on, the first circuit node is input a data signal, the second circuit node is reset to a reference potential, a signal input by the external signal source is a positive potential signal, and threshold voltages of the second thin film transistor and the third thin film transistor are negative biases;
- wherein the pixel driving circuit further includes a second reset stage:
- when the first scanning signal is at a low potential, the second scanning signal is at a high potential, the second thin film transistor is turned-off, the third thin film transistor is turn-on, the external signal source is at a negative potential, and a threshold voltage of the second thin film transistor is positive bias.
A display panel, comprising an active matrix organic light emitting diode (AMOLED) pixel driving circuit, wherein all or part of thin film transistors of the AMOLED pixel driving circuit are dual-gate thin film transistors to adjust threshold voltages of the thin film transistors in the AMOLED pixel drive circuit, wherein the AMOLED pixel drive circuit includes:
- a first thin film transistor, wherein a top gate of the first thin film transistor is connected to a first circuit node, a first electrode is connected to receive a power voltage, and a second electrode is connected to a second circuit node;
- a second thin film transistor, wherein a top gate of the second thin film transistor is connected to receive a first scanning signal, a third electrode is connected to receive a data voltage, and a fourth electrode is connected to the first circuit node;
- a third thin film transistor, wherein a top gate of the third thin film transistor is connected to receive a second scanning signal, a fifth electrode is connected to the second circuit node, and a sixth electrode is connected to receive a reference voltage;
- a capacitor, wherein one end is connected to the first circuit node, and the other end is connected to the second circuit node;
- and
- an organic light emitting diode, wherein an anode of the organic light emitting diode is electrically connected to the second circuit node, and a cathode is connected to receive a common ground voltage;
- wherein at least one of the second thin film transistor and the third thin film transistor is a dual-gate thin film transistor;
- wherein the pixel driving circuit includes a first reset and data writing stage:
- when the pixel driving circuit is in the first reset and data writing stage, the first scanning signal and the second scanning signal are at a high potential, the second thin film transistor and the third thin film transistor are turned-on, the first circuit node is input a data signal, the second circuit node is reset to a reference potential, a signal input by the external signal source is a positive potential signal, and threshold voltages of the second thin film transistor and the third thin film transistor are negative biases;
- wherein the pixel driving circuit further includes a second reset stage:
- when the first scanning signal is at a low potential, the second scanning signal is at a high potential, the second thin film transistor is turned-off, the third thin film transistor is turn-on, the external signal source is at a negative potential, and a threshold voltage of the second thin film transistor is positive bias.
Dependencies are inferred from the claim text.