Pixel circuit, display panel comprising the pixel circuit, and display device

Patent metadata

Field	Value
Publication number	US-12592190-B2
Application number	US-202318681742-A
Country	US
Kind code	B2
Filing date	May 23, 2023
Priority date	May 23, 2023
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

A pixel circuit includes a pixel driving circuit, a first light-emitting element, a second light-emitting element, a switching circuit including a first terminal, a second terminal and a control terminal, and a reset circuit. The pixel driving circuit is electrically connected to the first light-emitting element the first terminal is electrically connected to the pixel driving circuit, the second terminal is electrically connected to the second light-emitting element, the switching circuit is configured to: electrically connect the second light-emitting element to the pixel driving circuit in response to the control terminal receiving a first level signal, and disconnect an electrical connection between the second light-emitting element and the pixel driving circuit in response to the control terminal receiving a second level signal. The reset circuit is configured to reset the first light-emitting element and/or the second light-emitting element using the first reference voltage under control of the reset control signal.

First claim

The invention claimed is:

1 . A pixel circuit, comprising a pixel driving circuit, a first light-emitting element, a second light-emitting element, a switching circuit and a reset circuit,
wherein the pixel driving circuit is electrically connected to the first light-emitting element to drive the first light-emitting element to emit light, the switching circuit comprises a first terminal, a second terminal and a control terminal, the first terminal of the switching circuit is electrically connected to the pixel driving circuit, the second terminal of the switching circuit is electrically connected to the second light-emitting element, and the switching circuit is configured to: electrically connect the second light-emitting element to the pixel driving circuit in response to the control terminal receiving a first level signal, so that the pixel driving circuit drives the second light-emitting element to emit light, and disconnect an electrical connection between the second light-emitting element and the pixel driving circuit in response to the control terminal receiving a second level signal, so that the second light-emitting element is in a non-luminous state, wherein the reset circuit comprises a reference voltage connection terminal for receiving a first reference voltage and a reset control terminal for receiving a reset control signal, the reset circuit is electrically connected to either of the first terminal and the second terminal of the switching circuit, and at least one of the first light-emitting element and the second light-emitting element, and is configured to reset the first light-emitting element and/or the second light-emitting element using the first reference voltage under control of the reset control signal, wherein the switching circuit comprises a first transistor, the first terminal of the switching circuit comprises a first electrode of the first transistor, the second terminal of the switching circuit comprises a second electrode of the first transistor, and the control terminal of the switching circuit comprises a control electrode of the first transistor, wherein the first electrode of the first transistor is directly connected to a first electrode of the first light-emitting element, the second electrode of the first transistor is electrically connected to a first electrode of the second light-emitting element, the control electrode of the first transistor is configured to receive the first level signal or the second level signal, and a second electrode of the first light-emitting element and a second electrode of the second light-emitting element are electrically connected to a second reference voltage terminal.

2 . The pixel circuit according to claim 1 , wherein the reset circuit comprises a second transistor, a first electrode of the second transistor is electrically connected to the first electrode of the second light-emitting element, a second electrode of the second transistor is electrically connected to the reference voltage connection terminal, and a control electrode of the second transistor is electrically connected to the reset control terminal.

3 . The pixel circuit according to claim 1 , wherein the reset circuit comprises a second transistor, a first electrode of the second transistor is electrically connected to the first electrode of the first light-emitting element, a second electrode of the second transistor is electrically connected to the reference voltage connection terminal, and a control electrode of the second transistor is electrically connected to the reset control terminal.

4 . The pixel circuit according to claim 1 , wherein the reset circuit comprises a third transistor and a fourth transistor, the third transistor and the fourth transistor are connected in series between a first electrode of the first light-emitting element and a first electrode of the second light-emitting element, a second electrode of the first light-emitting element and a second electrode of the second light-emitting element are electrically connected to a second reference voltage terminal, a first node between the third transistor and the fourth transistor is electrically connected to the reference voltage connection terminal, and a control electrode of the third transistor and a control electrode of the fourth transistor are electrically connected to the reset control terminal.

5 . The pixel circuit according to claim 4 , wherein the switching circuit comprises a fifth transistor, the first terminal of the switching circuit comprises a first electrode of the fifth transistor, the second terminal of the switching circuit comprises a second electrode of the fifth transistor, and the control terminal of the switching circuit comprises a control electrode of the fifth transistor,
wherein the pixel driving circuit comprises a driving transistor, a sixth transistor, and a power supply voltage terminal for receiving a power supply voltage, the driving transistor and the sixth transistor are connected in series between the power supply voltage terminal and the first electrode of the first light-emitting element, the first electrode of the fifth transistor is electrically connected to a first electrode or a second electrode of the sixth transistor, and the second electrode of the fifth transistor is electrically connected to the first electrode of the second light-emitting element.

6 . The pixel circuit according to claim 1 , wherein the pixel driving circuit includes a driving transistor, a sixth transistor, a seventh transistor, and a power supply voltage terminal for receiving a power supply voltage, and the seventh transistor, the driving transistor and the sixth transistor are connected in series between the power supply voltage terminal and the first electrode of the first light-emitting element successively,
wherein the pixel driving circuit further comprises an eighth transistor, a first electrode of the eighth transistor is electrically connected to a third node between the driving transistor and the seventh transistor, a second electrode of the eighth transistor is electrically connected to a third reference voltage terminal, and a control electrode of the eighth transistor is electrically connected to the reset control terminal, wherein the pixel driving circuit further comprises a ninth transistor, a tenth transistor, a capacitor, and a fourth reference voltage terminal, wherein the capacitor, the ninth transistor and the tenth transistor are connected in series between the power supply voltage terminal and the fourth reference voltage terminal successively, and a control electrode of the driving transistor is electrically connected to a fourth node between the capacitor and the ninth transistor, and wherein a control electrode of the tenth transistor is electrically connected to the reset control terminal, and a control electrode of the ninth transistor is configured to receive a first scanning signal.

7 . The pixel circuit according to claim 6 , wherein the pixel driving circuit further comprises an eleventh transistor and a twelfth transistor, a first electrode and a second electrode of the eleventh transistor are electrically connected to a second node between the driving transistor and the sixth transistor, and a fifth node between the ninth transistor and the tenth transistor, respectively, a first electrode of the twelfth transistor is configured to receive a data signal, a second electrode of the twelfth transistor is electrically connected to the third node, and a control electrode of the eleventh transistor and a control electrode of the twelfth transistor are configured to receive a second scanning signal,
wherein the ninth transistor comprises a metal oxide thin film transistor, and the driving transistor, the sixth transistor

Assignees

• Boe Technology Group Co Ltd

Inventors

• Zhang Hao
• Liu Libin
• Feng Yu
• Cui Song
• Hsieh Mingche

Classifications

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2310/061

  for resetting or blanking · CPC title