Pixel circuit and display apparatus

Patent metadata

Field	Value
Publication number	US-12555535-B2
Application number	US-202418941520-A
Country	US
Kind code	B2
Filing date	Nov 8, 2024
Priority date	Aug 5, 2021
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

A pixel circuit and a display apparatus are provided. The pixel circuit includes: a driving circuit, a data writing circuit, a compensation circuit, a light emission control circuit, a first reset circuit, a second reset circuit, and a light-emitting element, wherein the driving circuit includes a control end, a first end and a second end; the data writing circuit is used for writing a data signal into the first end of the driving circuit under the control of a writing control signal; the first reset circuit is used for applying a first reset voltage to the control end of the driving circuit under the control of a first reset control signal; and the second reset circuit is used for applying a second reset voltage to a first electrode of the light-emitting element under the control of a second reset control signal.

First claim

The invention claimed is:

1 . A pixel circuit, comprising: a driving circuit, a data writing circuit, a compensation circuit, a light emission control circuit, a first reset circuit, a second reset circuit, and a light-emitting element, wherein:
the driving circuit comprises a control terminal, a first terminal and a second terminal, which are respectively connected with a first node, a second node, and a third node, and are used for controlling a driving current flowing through the first terminal and the second terminal for driving the light-emitting element to emit light; the data writing circuit is used for writing a data signal to the first terminal of the driving circuit under control of a writing control signal; the compensation circuit is used for electrically connecting the control terminal and the second terminal of the driving circuit under control of a compensation control signal, and storing a voltage of the control terminal of the driving circuit; the light emission control circuit is used for causing the driving current to flow through the light-emitting element under control of a light emission control signal; the first reset circuit is used for applying a first reset voltage to the control terminal of the driving circuit under control of a first reset control signal; and the second reset circuit is used for applying a second reset voltage to a first electrode of the light-emitting element under control of a second reset control signal, wherein the compensation circuit comprises a compensation transistor and a storage capacitor, a gate electrode of the compensation transistor is used for receiving the compensation control signal, a first electrode of the compensation transistor is connected with the third node, a second electrode of the compensation transistor is connected with a first electrode of the storage capacitor and the first node, and a second electrode of the storage capacitor is used for receiving a first power voltage, and wherein the first reset circuit comprises a reset transistor, a gate electrode of the reset transistor is used for receiving the first reset control signal, a first electrode of the reset transistor is connected with the third node, and a second electrode of the reset transistor is used for receiving the first reset voltage.

2 . The pixel circuit according to claim 1 , wherein the light emission control signal comprises a first light emission control signal and a second light emission control signal, and the light emission control circuit comprises:
a first light emission control circuit, used for applying the first power voltage to the first terminal of the driving circuit under control of the first light emission control signal; and a second light emission control circuit, used for applying the driving current from the second terminal of the driving circuit to the first electrode of the light-emitting element serving as a fourth node under control of the second light emission control signal.

3 . The pixel circuit according to claim 2 , wherein the driving circuit comprises a first transistor, a gate electrode of the first transistor serves as the control terminal of the driving circuit and is connected with the first node, a first electrode of the first transistor serves as the first terminal of the driving circuit and is connected with the second node, and a second electrode of the first transistor serves as the second terminal of the driving circuit and is connected with the third node.

4 . The pixel circuit according to claim 2 , wherein the data writing circuit comprises a second transistor, a gate electrode of the second transistor is used for receiving the writing control signal, a first electrode of the second transistor is used for receiving the data signal, and a second electrode of the second transistor is connected with the second node.

5 . The pixel circuit according to claim 2 , wherein,
the first light emission control circuit comprises a fourth transistor, a gate electrode of the fourth transistor is used for receiving the first light emission control signal, a first electrode of the fourth transistor is used for receiving the first power voltage, and a second electrode of the fourth transistor is connected with the second node; and the second light emission control circuit comprises a fifth transistor, a gate electrode of the fifth transistor is used for receiving the second light emission control signal, a first electrode of the fifth transistor is connected with the third node, a second electrode of the fifth transistor is connected with the first electrode of the light-emitting element, and the second electrode of the light-emitting element is used for receiving a second power voltage.

6 . The pixel circuit according to claim 2 , wherein, in a case where each display cycle sequentially comprises one write frame and at least one skip frame, within the write frame, the writing control signal and the second reset control signal are synchronized, and within each skip frame, the writing control signal is kept as an invalid level, and the second reset control signal of the skip frame has same characteristics as the second reset control signal of the write frame.

7 . The pixel circuit according to claim 6 , wherein:
for each display cycle, within the write frame and each skip frame, the first light emission control signal and the second light emission control signal are synchronized; or for each display cycle, within the write frame, the first light emission control signal and the second light emission control signal are synchronized, and within each skip frame, the first light emission control signal is kept as a valid level, and the second light emission control signal of the skip frame has same characteristics as the second light emission control signal of the write frame.

8 . The pixel circuit according to claim 1 , wherein the second reset circuit comprises a seventh transistor, a gate electrode of the seventh transistor is used for receiving the second reset control signal, a first electrode of the seventh transistor is connected with the first electrode of the light-emitting element, and a second electrode of the seventh transistor is used for receiving the second reset voltage.

9 . The pixel circuit according to claim 8 , wherein leakage current characteristics of at least one of the transistors whose first electrode or second electrode is directly connected with the storage capacitor are superior to leakage current characteristics of other transistors in the pixel circuit.

10 . A display apparatus, comprising a plurality of pixel units arranged in an array, wherein each of the pixel units comprises the pixel circuit according to claim 1 .

11 . A pixel circuit, comprising: a driving circuit, a data writing circuit, a compensation circuit, a light emission control circuit, a first reset circuit, a second reset circuit, and a light-emitting element, wherein:
the driving circuit comprises a control terminal, a first terminal and a second terminal, which are respectively connected with a first node, a second node, and a third node, and are used for controlling a driving current flowing through the first terminal and the second terminal for driving the light-emitting element to emit light; the data writing circuit is used for writing a data signal to the first terminal of the driving circuit under control of a writing control signal; the compensation circuit is used for electrically connecting the control terminal and the second terminal of the driving circuit under control of a compensation control signal, and storing a voltage of the control terminal of the driving circuit; the light emission control circu

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd

Inventors

• Chen Yipeng
• Shi Ling
• Zhou Weifeng

Classifications

• G09G2330/021

  Power management, e.g. power saving · 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

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title