US 10,769,998 B2Granted

Pixel circuit and driving method thereof, array substrate, and display panel

AssigneesBoe Technology Group Co., Ltd., Chengdu Boe Optoelectronics Technology Co., Ltd.

InventorYingsong Xu

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Abstract

Embodiments of the present disclosure provide a pixel circuit and a drive method thereof, an array substrate, and a display panel. The pixel circuit includes a drive transistor, a data write circuit, a light emission control circuit, a compensation circuit, a reset circuit, and a light emitting device. A first control electrode of the drive transistor is coupled to a first node, a second control electrode of the drive transistor is coupled to a second node, a first electrode of the drive transistor is coupled to a first voltage signal terminal, and a second electrode of the drive transistor is coupled to a third node and may provide a drive current. The light emitting device is coupled between the light emission control circuit and a second voltage signal terminal and may emit light based on the drive current.

Claims9

Dependent claims

A method for driving a pixel circuit,

wherein the pixel circuit comprises a drive transistor, a data write circuit, a light emission control circuit, a compensation circuit, a reset circuit, and a light emitting device,
wherein a first control electrode of the drive transistor is coupled to a first node, wherein a second control electrode of the drive transistor is coupled to a second node, wherein a first electrode of the drive transistor is coupled to a first voltage signal terminal, wherein a second electrode of the drive transistor is coupled to a third node, and wherein the drive transistor is configured to provide a drive current;
wherein the data write circuit is configured to provide a reference signal or a data signal from a data line to the first node according to a first drive signal from a first drive signal terminal;
wherein the light emission control circuit is configured to control, according to a pixel drive signal from a pixel drive signal terminal, to provide the drive current to the light emitting device;
wherein the compensation circuit is configured to control a voltage of the second node to be equal to a voltage of the third node according to a second drive signal from a second drive signal terminal;
wherein the reset circuit is configured to provide a third voltage signal from a third voltage signal terminal to the second node according to a reset signal from a reset signal terminal;
and
wherein the light emitting device is coupled between the light emission control circuit and a second voltage signal terminal and is configured to emit light according to the drive current;
wherein the method comprises:
providing the reset signal, the second drive signal, and the pixel drive signal, such that the voltage of the second node is equal to the voltage of the third node, and the drive current of the drive transistor is provided to the third voltage signal terminal via the compensation circuit and the reset circuit to reset the light emitting device;
providing the second drive signal, such that the voltage of the second node and the voltage of the third node rise to the equal voltage, and providing the first drive signal to provide the reference signal to the first node, such that the threshold voltage of the drive transistor is a voltage difference between a voltage of the reference signal and a voltage of a first voltage signal from the first voltage signal terminal;
providing the first drive signal to provide the data signal to the first node, and holding the threshold voltage of the drive transistor to be the voltage difference between the voltage of the reference signal and the voltage of the first voltage signal;
and
providing the pixel drive signal, such that the light emitting device emits light according to the drive current of the drive transistor.

11 more elements

An array substrate comprising:

a plurality of pixel circuits, the plurality of pixel circuits arranged in a matrix;
wherein each of the pixel circuits comprises a drive transistor, a data write circuit, a light emission control circuit, a compensation circuit, a reset circuit, and a light emitting device,
wherein a first control electrode of the drive transistor is coupled to a first node, wherein a second control electrode of the drive transistor is coupled to a second node, wherein a first electrode of the drive transistor is coupled to a first voltage signal terminal, wherein a second electrode of the drive transistor is coupled to a third node, and wherein the drive transistor is configured to provide a drive current;
wherein the data write circuit is configured to provide a reference signal or a data signal from a data line to the first node according to a first drive signal from a first drive signal terminal;
wherein the light emission control circuit is configured to control, according to a pixel drive signal from a pixel drive signal terminal, to provide the drive current to the light emitting device;
wherein the compensation circuit is configured to control a voltage of the second node to be equal to a voltage of the third node according to a second drive signal from a second drive signal terminal;
wherein the reset circuit is configured to provide a third voltage signal from a third voltage signal terminal to the second node according to a reset signal from a reset signal terminal;
and
wherein the light emitting device is coupled between the light emission control circuit and a second voltage signal terminal and is configured to emit light according to the drive current
wherein the array substrate further comprises a plurality of cascade-coupled gate driving transistors, wherein a gate drive signal provided by the (n−1)th stage gate driving transistor serves as a second drive signal of the nth row of pixel circuits, and wherein a gate drive signal provided by the nth stage gate driving transistor serves as a first drive signal of the nth row of pixel circuits.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/225,633Filed 19 Dec 2018
Priority: CN 2018 1 052303028 May 2018
Published: US 2019/0362674 A128 Nov 2019
Granted: 8 Sep 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G09G 3/3241
With pixel circuitry controlling the current through the light-emitting element: the current through the light-emitting element being set using a…
G09G 3/32
Using electroluminescent panels: semiconductive, e.g. using light-emitting diodes [LED]
G09G 3/3233
Using an active matrix: with pixel circuitry controlling the current through the light-emitting element
G09G 3/3225
Organic, e.g. using organic light-emitting diodes [OLED]: using an active matrix

Family

US 2019/0362674 A1Pre-grant publication · published 28 Nov 2019
US 2020/0312245 A9Published application
US 10,769,998 B2This patent

From the US filing history. Foreign family members aren’t listed.

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