Pixel driving circuit and display device
AssigneeWuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
InventorPeng Mao
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Abstract
The present disclosure discloses a pixel driving circuit and a display device, wherein the circuit includes: a data writing switch (T1), a first reset switch (T2), a second reset switch (T3), a driving transistor (T4), an organic light-emitting diode OLED, and a first storage capacitor (C1) and a second storage capacitor (C2). The embodiments of the present disclosure can compensate for the drift of driving the threshold voltage of the thin film transistor to improve the display quality.
Claims14
A pixel driving circuit, comprising a data writing switch, a first reset switch, a second reset switch, a driving transistor, an organic light-emitting diode, a first storage capacitor and a second storage capacitor;
- wherein
- a source of the data writing switch is connected to a data line, a drain of the data writing switch is connected to a first node;
- a source of the first reset switch transistor is connected to a first reference voltage, a drain of the first reset switch transistor is connected to a second node;
- a source of the second reset switch is connected to a high level, a drain of the second reset switch is connected to a third node;
- a gate of the driving transistor is connected to the first node, a source of the driving transistor is connected to the third node, a drain of the driving transistor is connected to an anode of the organic light-emitting diode;
- a first terminal of the first storage capacitor is connected to the third node, a second terminal of the first storage capacitor is connected to the second node;
- a first terminal of the second storage capacitor is connected to the second node, and a second terminal of the second storage capacitor is connected to the first node,
- wherein gates of the first reset switch and the data writing switch are both connected to a scan line, a gate of the second reset switch is connected to a first control signal, the data line is configured to write a data voltage when the data writing switch, the first reset switch and the second reset switch are turned on, so that the second storage capacitor stores the data voltage.
A pixel driving circuit, comprising a data writing switch, a first reset switch, a second reset switch, a driving transistor, an organic light-emitting diode, a first storage capacitor and a second storage capacitor;
- wherein
- a source of the data writing switch is connected to a data line, a drain of the data writing switch is connected to a first node;
- a source of the first reset switch transistor is connected to a first reference voltage, a drain of the first reset switch transistor is connected to a second node;
- a source of the second reset switch is connected to a high level, a drain of the second reset switch is connected to a third node;
- a gate of the driving transistor is connected to the first node, a source of the driving transistor is connected to the third node, a drain of the driving transistor is connected to an anode of the organic light-emitting diode;
- a first terminal of the first storage capacitor is connected to the third node, a second terminal of the first storage capacitor is connected to the second node;
- a first terminal of the second storage capacitor is connected to the second node, and a second terminal of the second storage capacitor is connected to the first node,
- wherein the pixel driving circuit further comprises a first control switch, a second control switch and a third control switch, a source of the first control switch is connected to a power supply voltage, a gate of the first control switch is connected to a third control signal, a drain of the first control switch is connected to a source of the driving transistor;
- a source of the second control switch is connected to a drain of the driving transistor and a drain of a compensating transistor, a gate of the second control switch is connected to the control signal, a drain of the second control switch is connected to the anode of the organic light-emitting diode;
- a source of the third control switch is connected to the second node, a gate of the third control switch is connected to a fourth control signal, a drain of the third control switch is connected to the first node;
- after the first storage capacitor stores a threshold voltage of the driving transistor, the first control switch, the second control switch and the third control switch are turned on at the same time, so that the organic light-emitting diode emits light.
A display device, comprising a pixel driving circuit, wherein the pixel driving circuit comprises a data writing switch, a first reset switch, a second reset switch, a driving transistor, an organic light-emitting diode, a first storage capacitor and a second storage capacitor;
- a source of the data writing switch is connected to a data line, a drain of the data writing switch is connected to a first node;
- a source of the first reset switch transistor is connected to a first reference voltage, a drain of the first reset switch transistor is connected to a second node;
- a source of the second reset switch is connected to a high level, a drain of the second reset switch is connected to a third node;
- a gate of the driving transistor is connected to the first node, a source of the driving transistor is connected to the third node, a drain of the driving transistor is connected to an anode of the organic light-emitting diode;
- a first terminal of the first storage capacitor is connected to the third node, a second terminal of the first storage capacitor is connected to the second node;
- a first terminal of the second storage capacitor is connected to the second node and a second terminal of the second storage capacitor is connected to the first node;
- wherein gates of the first reset switch and the data writing switch are both connected to a scan line, a gate of the second reset switch is connected to a first control signal, the data line is configured to write a data voltage when the data writing switch, the first reset switch and the second reset switch are turned on, so that the second storage capacitor stores the data voltage.
Dependencies are inferred from the claim text.