Pixel driving circuit and display panel
AssigneeWuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
InventorsXuanyun Wang, Chao Dai, Jianlong Wu
Life of this patent
Estimating the term…
Abstract
The disclosure provides a pixel driving circuit and a display panel. The pixel driving circuit includes a first transistor, a second transistor, a first capacitor, a second capacitor, and an organic light emitting diode; the second transistor is a low-temperature polysilicon transistor. The disclosure can improve the phenomenon of screen flickering caused by large leakage current of the display panel, thereby being beneficial to improve the brightness uniformity.
Claims20
A pixel driving circuit, comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor, and an organic light emitting diode;
- the second transistor is a low-temperature polysilicon transistor;
- wherein
- a gate of the first transistor is connected to a first node, a source of the first transistor is connected to a second node, and a drain of the first transistor is connected to a third node;
- a gate of the second transistor is connected to a first scan signal, a source of the second transistor is connected to a data signal, and a drain of the second transistor is connected to the second node;
- a gate of the third transistor is connected to an enabling signal, a source of the third transistor is connected to a first power signal, and a drain of the third transistor is connected to the second node;
- a gate of the fourth transistor is connected to the enabling signal, a source of the fourth transistor is connected to the third node, and a drain of the fourth transistor is connected to an anode of the organic light emitting diode;
- one end of the first capacitor is connected to the first power signal, and the other end of the first capacitor is connected to the first node;
- one end of the second capacitor is connected to the gate of the second transistor, and the other end of the second capacitor is connected to the first node;
- the anode of the organic light emitting diode is connected to the third node, and a cathode of the organic light emitting diode is connected to a second power signal.
A display panel, comprising a pixel driving circuit;
- wherein the pixel driving circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a first capacitor, a second capacitor, and an organic light emitting diode;
- the second transistor is a low-temperature polysilicon transistor;
- a gate of the first transistor is connected to a first node, a source of the first transistor is connected to a second node, and a drain of the first transistor is connected to a third node;
- a gate of the second transistor is connected to a first scan signal, a source of the second transistor is connected to a data signal, and a drain of the second transistor is connected to the second node;
- a gate of the third transistor is connected to an enabling signal, a source of the third transistor is connected to a first power signal, and a drain of the third transistor is connected to the second node;
- a gate of the fourth transistor is connected to the enabling signal, a source of the fourth transistor is connected to the third node, and a drain of the fourth transistor is connected to an anode of the organic light emitting diode;
- one end of the first capacitor is connected to the first power signal, and the other end of the first capacitor is connected to the first node;
- one end of the second capacitor is connected to the gate of the second transistor, and the other end of the second capacitor is connected to the first node;
- the anode of the organic light emitting diode is connected to the third node, and a cathode of the organic light emitting diode is connected to a second power signal.
Dependencies are inferred from the claim text.