Pixel circuit having a switching circuit, a shared circuit, a first sub-pixel circuit and a second sub-pixel circuit and driving method thereof, display panel

Patent metadata

Field	Value
Publication number	US-10679556-B2
Application number	US-201716073928-A
Country	US
Kind code	B2
Filing date	Dec 15, 2017
Priority date	May 12, 2017
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A pixel circuit, a driving method thereof, and a display panel are provided. The pixel circuit includes a switching circuit, a shared circuit, a first sub-pixel circuit and a second sub-pixel circuit. The switching circuit includes a control terminal, a first terminal and a second terminal. The shared circuit includes a control terminal, a first terminal and a second terminal, the first terminal of the shared circuit is electrically connected to the second terminal of the switching circuit, both the first terminal of the shared circuit and the control terminal of the shared circuit are electrically connected to the first sub-pixel circuit and also electrically connected to the second sub-pixel circuit, and the shared circuit is configured to compensate for the first sub-pixel circuit and the second sub-pixel circuit.

First claim

What is claimed is:

1. A pixel circuit, comprising: a switching circuit, a shared circuit, a first sub-pixel circuit and a second sub-pixel circuit,
wherein the switching circuit comprises a control terminal, a first terminal and a second terminal,
the shared circuit comprises a control terminal, a first terminal and a second terminal, the first terminal of the shared circuit is electrically connected to the second terminal of the switching circuit, both the second terminal of the shared circuit and the control terminal of the shared circuit are electrically connected to the first sub-pixel circuit and also electrically connected to the second sub-pixel circuit, and
the shared circuit is configured to compensate for the first sub-pixel circuit and the second sub-pixel circuit
wherein the shared circuit comprises a shared transistor,
the shared transistor comprises a gate electrode, a first electrode and a second electrode, the first electrode of the shared transistor serves as the first terminal of the shared circuit, the second electrode of the shared transistor serves as the second terminal of the shared circuit, and the gate electrode of the shared transistor serves as the control terminal of the shared circuit;
wherein the first sub-pixel circuit comprises a first driving transistor, a first light emitting device and a first node, the first driving transistor comprises a gate electrode electrically connected to the first node, and the first light emitting device is driven to emit light by an electric current flowing through the first driving transistor;
the second sub-pixel circuit comprises a second driving transistor, a second light emitting device and a second node, the second driving transistor comprises a gate electrode electrically connected to the second node, and the second light emitting device is driven to emit light by an electric current flowing through the second driving transistor;
both the gate electrode of the shared transistor and the second electrode of the shared transistor are electrically connected to the first node and the second node; and
a threshold voltage of the first driving transistor and a threshold voltage of the second driving transistor are substantially equal to a threshold voltage of the shared transistor,
and wherein the first sub-pixel circuit further comprises a first sub-pixel switching transistor,
the first sub-pixel switching transistor comprises a gate electrode, a first electrode and a second electrode, and the first electrode of the first sub-pixel switching transistor and the second electrode of the first sub-pixel switching transistor are electrically connected to the second electrode of the shared transistor and the first node, respectively.

2. The pixel circuit according to claim 1 , further comprising a third sub-pixel circuit, wherein the third sub-pixel circuit comprises a third driving transistor, a third light emitting device and a third node,
the third driving transistor comprises a gate electrode electrically connected to the third node, and the third light emitting device is driven to emit light by an electric current flowing through the third driving transistor;
both the gate electrode of the shared transistor and the second electrode of the shared transistor are electrically connected to the third node; and
a threshold voltage of the third driving transistor is substantially equal to the threshold voltage of the shared transistor.

3. The pixel circuit according to claim 2 , wherein the second sub-pixel circuit further comprises a second sub-pixel switching transistor, the second sub-pixel switching transistor comprises a gate electrode, a first electrode and a second electrode, and the first electrode of the second sub-pixel switching transistor and the second electrode of the second sub-pixel switching transistor are electrically connected to the second electrode of the shared transistor and the second node, respectively.

4. The pixel circuit according to claim 2 , wherein the first sub-pixel circuit further comprises a first light emission control circuit, the first light emission control circuit comprises a control terminal, a first terminal and a second terminal, and the first terminal of the first light emission control circuit and the second terminal of the first light emission control circuit are respectively electrically connected to the first driving transistor and the first light emitting device, configured to turn on or turn off an electric current flowing through the first light emitting device; and
the second sub-pixel circuit further comprises a second light emission control circuit, the second light emission control circuit comprises a control terminal, a second terminal and a second terminal, and the first terminal of the second light emission control circuit and the second terminal of the second light emission control circuit are respectively electrically connected to the second driving transistor and the second light emitting device, configured to turn on or turn off an electric current flowing through the second light emitting device.

5. The pixel circuit according to claim 2 , wherein the first sub-pixel circuit further comprises a first storage capacitor, and one terminal of the first storage capacitor is electrically connected to the first node for storing a voltage of the first node; and
the second sub-pixel circuit further comprises a second storage capacitor, and one terminal of the second storage capacitor is electrically connected to the second node for storing a voltage of the second node.

6. The pixel circuit according to claim 1 , further comprising a reset circuit, wherein the reset circuit comprises a control terminal, a first terminal and a second terminal, the first terminal of the reset circuit is configured to receive a reset voltage, and the second terminal of the reset circuit is electrically connected to the first node through the first sub-pixel switching transistor and is further electrically connected to the second node.

7. The pixel circuit according to claim 1 , wherein the first subs pixel circuit further comprises a first light emission control circuit, the first light emission control circuit comprises a control terminal, a first terminal and a second terminal, and the first terminal of the first light emission control circuit and the second terminal of the first light emission control circuit are respectively electrically connected to the first driving transistor and the first light emitting device, configured to turn on or turn off an electric current flowing through the first light emitting device; and
the second sub-pixel circuit further comprises a second light emission control circuit, the second light emission control circuit comprises a control terminal, a second terminal and a second terminal, and the first terminal of the second light emission control circuit and the second terminal of the second light emission control circuit are respectively electrically connected to the second driving transistor and the second light emitting device, configured to turn on or turn off an electric current flowing through the second light emitting device.

8. The pixel circuit according to claim 1 , wherein the first sub-pixel circuit further comprises a first storage capacitor, and one terminal of the first storage capacitor is electrically connected to the first node for storing a voltage of the first node; and
the second sub-pixel circuit further comprises a second storage capacitor, and one terminal of the second storage capacitor is electrically connected to the second node for storing a voltage of the second node.

9. The pixel circuit according to claim 1 , wherein the first light emitting device and the second light emitting

Assignees

• Boe Technology Group Co Ltd

Inventors

• Yang Shengji
• Dong Xue
• Lv Jing
• Chen Xiaochuan

Classifications

• G09G2300/0439

  Pixel structures · CPC title

• G09G2300/0809

  Several active elements per pixel in active matrix panels · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title