Pixel circuit, driving method and display device

Patent metadata

Field	Value
Publication number	US-12217673-B2
Application number	US-202117783241-A
Country	US
Kind code	B2
Filing date	Jun 23, 2021
Priority date	Jun 23, 2021
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

Abstract

A pixel circuit includes a light-emitting element, a driving circuit, a first light-emitting control circuit, a compensation control circuit and a resetting circuit. The resetting circuit is configured to write an initial voltage into the first electrode of the light-emitting element under the control of a first light-emitting control signal, the first light-emitting control circuit is configured to control the first electrode of the light-emitting element to be electrically connected to the first terminal of the driving circuit under the control of a second light-emitting control signal, and the compensation control circuit is configured to control the control terminal of the driving circuit to be electrically connected to the first terminal of the driving circuit under the control of a first scanning signal.

First claim

What is claimed is:

1. A pixel circuit, comprising a light-emitting element, a driving circuit, a first light-emitting control circuit, a compensation control circuit and a resetting circuit; wherein a refresh display period of the pixel circuit comprises a refresh resetting stage, and at least one display-maintaining period comprising a resetting-maintaining stage is set after the refresh display period; wherein,
the resetting circuit is electrically connected to a first light-emitting control line, an initial voltage terminal and a first electrode of the light-emitting element, and configured to write an initial voltage at the initial voltage terminal into the first electrode of the light-emitting element under the control of a first light-emitting control signal from the first light-emitting control line;
the first light-emitting control circuit is electrically connected to a second light-emitting control line, the first electrode of the light-emitting element and a first terminal of the driving circuit, and configured to control the first electrode of the light-emitting element to be electrically connected to the first terminal of the driving circuit under the control of a second light-emitting control signal from the second light-emitting control line;
the compensation control circuit is electrically connected to a first scanning line, a control terminal of the driving circuit and the first terminal of the driving circuit, and configured to control the control terminal of the driving circuit to be electrically connected to the first terminal of the driving circuit under the control of a first scanning signal from the first scanning line;
the driving circuit is configured to control the generation of a driving current for driving the light-emitting element to emit light under the control of a potential at the control terminal of the driving circuit; and
a second electrode of the light-emitting element is electrically connected to a first voltage terminal;
wherein,
the resetting circuit is configured to write, within the refresh resetting stage, a first resetting voltage into the first electrode of the light-emitting element under the control of a first light-emitting control signal;
the first light-emitting control circuit is configured to control, within the refresh resetting stage, the first electrode of the light-emitting element to be electrically connected to the first terminal of the driving circuit under the control of a second light-emitting control signal;
the compensation control circuit is configured to control, within the refresh resetting stage, the control terminal of the driving circuit to be electrically connected to the first terminal of the driving circuit under the control of the first scanning signal, to write the first resetting voltage into the control terminal of the driving circuit;
the resetting circuit is further configured to write, within the resetting-maintaining stage, a second resetting voltage into the first electrode of the light-emitting element under the control of a first light-emitting control signal;
the first light-emitting control circuit is further configured to control, within the resetting-maintaining stage, the first electrode of the light-emitting element to be electrically connected to the first terminal of the driving circuit under the control of a second light-emitting control signal, to write the second resetting voltage into the first terminal of the driving circuit;
the compensation control circuit is further configured to control, within the resetting-maintaining stage, the control terminal of the driving circuit to be electrically disconnected from the first terminal of the driving circuit under the control of the first scanning signal.

2. The pixel circuit according to claim 1 , further comprising a second light-emitting control circuit, a data written-in circuit and an energy storage circuit;
the second light-emitting control circuit is electrically connected to the first light-emitting control line, a second voltage terminal and a second terminal of the driving circuit, and configured to control the second voltage terminal to be electrically connected to the second terminal of the driving circuit under the control of the first light-emitting control signal;
the data written-in circuit is electrically connected to a second scanning line, a data line and the second terminal of the driving circuit, and configured to write a data voltage from the data line into the second terminal of the driving circuit under the control of a second scanning signal from the second scanning line; and
the energy storage circuit is electrically connected to the control terminal of the driving circuit, and configured to store an electrical energy.

3. The pixel circuit according to claim 1 , wherein the resetting circuit comprises a first transistor, the compensation control circuit comprises a second transistor, the first light-emitting control circuit comprises a third transistor, and the driving circuit comprises a driving transistor;
a control electrode of the first transistor is electrically connected to the first light-emitting control line, a first electrode of the first transistor is electrically connected to the initial voltage terminal, and a second electrode of the first transistor is electrically connected to the first electrode of the light-emitting element;
a control electrode of the second transistor is electrically connected to the first scanning line, a first electrode of the second transistor is electrically connected to the control terminal of the driving circuit, and a second electrode of the second transistor is electrically connected to the first electrode of the driving circuit;
a control electrode of the third transistor is electrically connected to the second light-emitting control line, a first electrode of the third transistor is electrically connected to the first terminal of the driving circuit, and a second electrode of the third transistor is electrically connected to the first electrode of the light-emitting element; and
a gate electrode of the driving transistor is electrically connected to the control terminal of the driving circuit, a first electrode of the driving transistor is electrically connected to the first terminal of the driving circuit, and a second electrode of the driving transistor is electrically connected to the second terminal of the driving circuit.

4. The pixel circuit according to claim 3 , wherein the first transistor and the second transistor are each an n-type transistor, and the driving transistor and the third transistor are each a p-type transistor.

5. The pixel circuit according to claim 2 , wherein the energy storage circuit comprises a storage capacitor, a first terminal of the storage capacitor is electrically connected to the control terminal of the driving circuit, and a second terminal of the storage capacitor is electrically connected to the second voltage terminal.

6. The pixel circuit according to claim 2 , wherein the data written-in circuit comprises a fourth transistor, and the second light-emitting control circuit comprises a fifth transistor;
a control electrode of the fourth transistor is electrically connected to the second scanning line, a first electrode of the fourth transistor is electrically connected to the data line, and a second electrode of the fourth transistor is electrically connected to the second terminal of the driving circuit; and
a control electrode of the fifth transistor is electrically connected to the first light-emitting control line, a first electrode of the fifth transistor is electrically connected to the second voltage terminal, and a second electrode of the fifth transistor is electrically connected to the second terminal of the driving circuit.

Assignees

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

Inventors

• Huang Yao
• Cheng Tianyi
• Hu Ming
• Huang Weiyun
• Wang Benlian
• Kim Doyoung
• Ma Long

Classifications

• G09G2320/0247

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• 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

• G09G2300/0842

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

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title