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US 10,762,840 B2Granted
Pixel circuit and driving method thereof, display device
AssigneeKunShan Go-Visionox Opto-Electronics Co., Ltd
InventorZhiyi Zhou
Life of this patent
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Abstract
A pixel circuit and a driving method thereof, a display device are provided. The pixel circuit includes: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a ninth thin film transistor, a first capacitor, a second capacitor, and a light emitting diode. In the pixel circuit provided by the embodiment of the application, a compensation voltage provided by a compensation voltage signal line can partially compensate a supply voltage during an emission stage of the pixel circuit.
Claims14
A pixel circuit comprising:
- a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a ninth thin film transistor, a first capacitor, a second capacitor, and a light emitting diode,
- wherein a gate of the first thin film transistor is respectively connected to a source of the third thin film transistor, a source of the fourth thin film transistor, a first end of the first capacitor and a first end of the second capacitor;
- a drain of the fourth thin film transistor is respectively connected to a drain of the ninth thin film transistor and a reference voltage signal line;
- a second end of the first capacitor is respectively connected to a drain of the seventh thin film transistor and a drain of the eighth thin film transistor;
- a source of the seventh thin film transistor is connected to a compensation voltage signal line, and a second end of the second capacitor is connected to a control signal line;
- a source of the first thin film transistor is respectively connected to a drain of the second thin film transistor, a drain of the fifth thin film transistor, and a source of the eighth thin film transistor;
- a source of the second thin film transistor is connected to a data voltage signal line, and a source of the fifth thin film transistor is connected to a first power source;
- and
- a drain of the first thin film transistor is respectively connected to a drain of the third thin film transistor and a source of the sixth thin film transistor;
- a drain of the sixth thin film transistor is respectively connected to a source of the ninth thin film transistor and an anode of the light emitting diode, and a cathode of the light emitting diode is connected to a second power source,
- wherein the first power source supplies a supply voltage to the first thin film transistor, and a current flows into the second power source when the light emitting diode emits light,
- wherein the reference voltage signal line provides a reference voltage, the reference voltage is a negative voltage initializing the gate of the first thin film transistor and the anode of the light emitting diode, and the control signal line provides a control signal, the control signal provides an alternating voltage changing a voltage of the second end of the second capacitor, and
- wherein the compensation voltage signal line provides a compensation voltage partially compensating the supply voltage provided by the first power source.
10 more elements
A pixel circuit driving method, comprising:
- in a first stage, controlling by a first scanning signal a fourth thin film transistor to change from an off-state to an on-state, initializing by a reference voltage provided by a reference voltage signal line a gate of a first thin film transistor, a first end of a first capacitor, and a first end of a second capacitor, controlling by a second scanning signal a second thin film transistor, a third thin film transistor and a seventh thin film transistor to be in an off-state, controlling by a third scanning signal a ninth thin film transistor to be in an off-state, controlling by an emission control signal a fifth thin film transistor, a sixth thin film transistor, and an eighth thin film transistor to be in an off-state, and applying by a control signal line a high level to a second end of the second capacitor;
- in a second stage, controlling by the first scanning signal the fourth thin film transistor to change from the on-state to the off-state, controlling by the second scanning signal the second thin film transistor, the third thin film transistor, and the seven thin film transistor to change from the off-state to the on-state, and compensating for a threshold voltage of the first thin film transistor, applying by a compensation voltage provided by a compensation voltage signal line a voltage to a second end of the first capacitor, controlling by the third scanning signal the ninth thin film transistor to change from the off-state to the on-state, initializing by a reference voltage an anode of a light emitting diode;
- controlling by the emission control signal the fifth thin film transistor, the sixth thin film transistor and the eighth thin film transistor to be in the off-state, and applying by the control signal line a low level to the second end of the second capacitor;
- in a third stage, controlling by the first scanning signal the fourth thin film transistor to be in the off-state, controlling by the second scanning signal the second thin film transistor, the third thin film transistor, and the seventh thin film transistor to change from the on-state to the off-state, controlling by the third scanning signal the ninth thin film transistor to change from the on-state to the off-state, controlling by the emission control signal the fifth thin film transistor, the sixth thin film transistor, and the eighth thin film transistor to change from the off-state to the on-state, wherein, the light emitting diode emits light, and the control signal line applies a high level to the second end of the second capacitor.
1 more element
A display device, comprising:
- a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a ninth thin film transistor, a first capacitor, a second capacitor, and a light emitting diode,
- wherein a gate of the first thin film transistor is respectively connected to a source of the third thin film transistor, a source of the fourth thin film transistor, a first end of the first capacitor and a first end of the second capacitor;
- a drain of the fourth thin film transistor is respectively connected to a drain of the ninth thin film transistor and a reference voltage signal line;
- a second end of the first capacitor is respectively connected to a drain of the seventh thin film transistor and a drain of the eighth thin film transistor;
- a source of the seventh thin film transistor is connected to a compensation voltage signal line, and a second end of the second capacitor is connected to a control signal line;
- a source of the first thin film transistor is respectively connected to a drain of the second thin film transistor, a drain of the fifth thin film transistor, and a source of the eighth thin film transistor;
- a source of the second thin film transistor is connected to a data voltage signal line, and a source of the fifth thin film transistor is connected to a first power source;
- and
- a drain of the first thin film transistor is respectively connected to a drain of the third thin film transistor and a source of the sixth thin film transistor;
- a drain of the sixth thin film transistor is respectively connected to a source of the ninth thin film transistor and an anode of the light emitting diode, and a cathode of the light emitting diode is connected to a second power source,
- wherein the first power source supplies a supply voltage to the first thin film transistor, and a current flows into the second power source when the light emitting diode emits light,
- wherein the reference voltage signal line provides a reference voltage, the reference voltage is a negative voltage initializing the gate of the first thin film transistor and the anode of the light emitting diode, and the control signal line provides a control signal, the control signal provides an alternating voltage changing a voltage of the second end of the second capacitor, and
- wherein the compensation voltage signal line provides a compensation voltage partially compensating the supply voltage provided by the first power source.
10 more elements
Dependencies are inferred from the claim text.