Pixel circuit, driving method of pixel circuit and display apparatus

Patent metadata

Field	Value
Publication number	US-12354543-B2
Application number	US-202218262121-A
Country	US
Kind code	B2
Filing date	May 30, 2022
Priority date	May 30, 2022
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A pixel circuit includes: a driving sub-circuit, a sensing sub-circuit, a light-emitting control sub-circuit, a sensing control sub-circuit, a light-emitting device and a sensing terminal. The driving sub-circuit includes a first terminal and a second terminal coupled to the light-emitting device, and is configured to write a data signal into the driving sub-circuit in response to a first scan signal and control an electrical signal flowing through the driving sub-circuit according to the data signal. The sensing sub-circuit is configured to connect the second terminal to the sensing terminal in response to a second scan signal. The light-emitting control sub-circuit is configured to connect a first voltage terminal to the first terminal in response to a light-emitting control signal. The sensing control sub-circuit is configured to connect a second voltage terminal to the first terminal in response to a sensing control signal provided by a sensing control terminal.

First claim

What is claimed is:

1. A driving method of a pixel circuit, wherein the pixel circuit comprises:
a light-emitting device and a sensing terminal;
a driving sub-circuit including a first terminal and a second terminal coupled to the light-emitting device, wherein the driving sub-circuit is configured to write a data signal into the driving sub-circuit in response to a first scan signal and control an electrical signal flowing through the first terminal and the second terminal of the driving sub-circuit according to the data signal;
a sensing sub-circuit configured to connect the second terminal of the driving sub-circuit to the sensing terminal in response to a second scan signal;
a light-emitting control sub-circuit configured to connect a first voltage terminal to the first terminal of the driving sub-circuit in response to a light-emitting control signal; and
a sensing control sub-circuit configured to connect a second voltage terminal to the first terminal of the driving sub-circuit in response to a sensing control signal provided by a sensing control terminal;
wherein the method comprises:
transmitting, by the sensing control sub-circuit, a voltage applied to the second voltage terminal to the first terminal of the driving sub-circuit in response to the sensing control signal being at a valid voltage;
writing, by the driving sub-circuit, the data signal into the driving sub-circuit in response to the first scan signal;
writing, by the sensing sub-circuit, a sensing signal applied to the sensing terminal into the second terminal of the driving sub-circuit in response to the second scan signal;
gradually changing a voltage of the sensing signal until the driving sub-circuit reaches an off state; and
detecting a voltage of the second terminal of the driving sub-circuit.

2. The driving method of the pixel circuit according to claim 1 , wherein
the sensing control sub-circuit includes a first transistor, the driving sub-circuit includes a third transistor and a driving transistor, and the sensing sub-circuit includes a fourth transistor; in the first transistor, a gate is coupled to the sensing control terminal, a first electrode is coupled to the second voltage terminal, and a second electrode is coupled to the first terminal of the driving sub-circuit; in the third transistor, a gate is configured to receive the first scan signal, and a first electrode is configured to receive the data signal; in the driving transistor, a gate is coupled to a second electrode of the third transistor, a first electrode serves as the first terminal of the driving sub-circuit, and a second electrode serves as the second terminal of the driving sub-circuit and is coupled to the light-emitting device; and in the fourth transistor, a gate is configured to receive the second scan signal, a first electrode is coupled to the second terminal of the driving sub-circuit, and a second electrode is coupled to the sensing terminal;
the first transistor is turned on in response to the sensing control signal being at the valid voltage, so as to transmit the voltage of the second voltage terminal to the first electrode of the driving transistor;
the third transistor is turned on in response to the first scan signal being at a valid voltage, so as to write the data signal into the gate of the drive transistor; and the fourth transistor is turned on in response to the second scan signal being at a valid voltage, so as to transmit the sensing signal received by the sensing terminal to the second electrode of the driving transistor;
the voltage of the sensing signal is gradually changed until a voltage difference between the gate and the second electrode of the driving transistor is substantially equal to a threshold voltage of the driving transistor; and
the voltage of the second electrode of the driving transistor is detected.

3. A display apparatus, comprising:
data lines;
first pixel circuits and second pixel circuits; both a first pixel circuit in the first pixel circuits and a second pixel circuit in the second pixel circuits being coupled to a data line in the data lines; wherein a sensing control terminal of the first pixel circuit is coupled to a sensing control terminal of the second pixel circuit; and
a shift register circuit configured to: output an Nth stage first scan signal and an Nth stage second scan signal to the first pixel circuit; and output an Mth stage first scan signal and an Mth stage second scan signal to the second pixel circuit; wherein the shift register circuit is further configured to output the sensing control signal to at least one of a sensing control terminal of the first pixel circuit and a sensing control terminal of the second pixel circuit, wherein M and N are different natural numbers;
wherein each of the first pixel circuits and second pixel circuits includes:
a light-emitting device and a sensing terminal;
a driving sub-circuit including a first terminal and a second terminal coupled to the light-emitting device, wherein the driving sub-circuit is configured to write a data signal into the driving sub-circuit in response to a first scan signal and control an electrical signal flowing through the first terminal and the second terminal of the driving sub-circuit according to the data signal;
a sensing sub-circuit configured to connect the second terminal of the driving sub-circuit to the sensing terminal in response to a second scan signal;
a light-emitting control sub-circuit configured to connect a first voltage terminal to the first terminal of the driving sub-circuit in response to a light-emitting control signal; and
a sensing control sub-circuit configured to connect a second voltage terminal to the first terminal of the driving sub-circuit in response to a sensing control signal provided by a sensing control terminal;
wherein the shift register circuit includes:
a first input sub-circuit configured to, in response to an input signal applied to a first signal input terminal, set an Nth stage pull-up node and an Mth stage pull-up node to be at a valid voltage;
an Mth stage output sub-circuit configured to, in response to the valid voltage at the Mth stage pull-up node, transmit an Mth stage first clock signal applied to an Mth stage first clock signal terminal to an Mth stage first output terminal as the Mth stage first scan signal, and transmit an Mth stage second clock signal applied to an Mth stage second clock signal terminal to an Mth stage second output terminal as the Mth stage second scan signal, wherein both the Mth stage first output terminal and the Mth stage second output terminal are coupled to the second pixel circuit;
a sensing control signal output sub-circuit configured to, in response to the valid voltage at the Mth stage pull-up node, transmit an Mth stage third clock signal of an Mth stage third clock signal terminal to a sensing control signal output terminal as the sensing control signal, wherein the sensing control signal output terminal is coupled to at least one of the sensing control terminal of the second pixel circuit and the sensing control terminal of the first pixel circuit;
an Nth stage output sub-circuit configured to, in response to the valid voltage at the Nth stage pull-up node, transmit an Nth stage first clock signal of an Nth stage first clock signal terminal to an Nth stage first output terminal as the Nth stage first scan signal, and transmit an Nth stage second clock signal applied to an Nth stage second clock signal terminal to an Nth stage second output terminal as the Nth stage second scan signal, wherein both the Nth stage first output terminal and the Nth stage second output terminal are coupled to the first pixel circuit.

4. The display apparatus according to claim 3 , wherein
the sensing control signal output sub-circuit includes:
a fifth transistor inclu

Assignees

• Hefei Boe Joint Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wu Liu
• Feng Xuehuan
• Li Yongqian

Classifications

• G11C19/28

  using semiconductor elements (G11C19/14, G11C19/36 take precedence) · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2310/08

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

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · 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