Driving method and driving device for a display panel, and display device

Patent metadata

Field	Value
Publication number	US-12106718-B2
Application number	US-202318240831-A
Country	US
Kind code	B2
Filing date	Aug 31, 2023
Priority date	Sep 26, 2021
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

A driving method and driving device for a display panel, and a display device. The driving method includes: in a first driving stage, controlling a data voltage signal input terminal to transmit a voltage corresponding to a data voltage to a gate of a drive transistor; and in a second driving stage, controlling the data voltage signal input terminal to transmit a hold voltage to a source of the drive transistor to couple the voltage of the gate of the drive transistor through the hold voltage of the source of the drive transistor.

First claim

What is claimed is:

1. A driving method for a display panel, the display panel comprising a light-emitting structure and a driving circuit that drives the light-emitting structure to emit light, the driving circuit comprising a drive transistor, a drive mode of the display panel comprising a first drive mode, the first drive mode comprising a plurality of first driving cycles, each of the plurality of first driving cycles comprising a first driving stage and a second driving stage, and the driving method comprising:
in the first driving stage, controlling a data voltage signal input terminal to transmit a voltage corresponding to a data voltage to a gate of the drive transistor, wherein the first driving stage comprises a first write stage and a first light emission stage; and
in the second driving stage, controlling the data voltage signal input terminal to transmit a hold voltage to a source of the drive transistor to couple a voltage of the gate of the drive transistor through the hold voltage of the source of the drive transistor, wherein a duration of the second driving stage is N−1 times a duration of the first driving stage, the second driving stage comprises N−1 sub-driving cycles, each of the N−1 sub-driving cycles comprises a second write stage and a second light emission stage, and N is an integer greater than or equal to 2.

2. The method according to claim 1 , wherein the duration of the second driving stage is greater than or equal to the duration of the first driving stage.

3. The method according to claim 2 , wherein
in the first driving stage, a number of times, the data voltage signal input terminal is controlled to transmit the voltage corresponding to the data voltage to the gate of the drive transistor, is one, and
in the second driving stage, a number of times, the data voltage signal input terminal is controlled to transmit the hold voltage to the source of the drive transistor, is N−1.

4. The method according to claim 3 , after controlling the data voltage signal input terminal to transmit the voltage corresponding to the data voltage to the gate of the drive transistor in the first driving stage, further comprising:
controlling the drive transistor to transmit a drive current to the light-emitting structure, to drive the light-emitting structure to emit light.

5. The method according to claim 4 , wherein the driving circuit further comprises a data write transistor, a compensation transistor, a first light emission control transistor and a second light emission control transistor; a first terminal of the data write transistor is connected to the data voltage signal input terminal, and a second terminal of the data write transistor is connected to the source of the drive transistor and a first terminal of the first light emission control transistor; a second terminal of the first light emission control transistor is connected to a power supply voltage input terminal; a drain of the drive transistor is connected to a first terminal of the second light emission control transistor and a first terminal of the compensation transistor; a second terminal of the compensation transistor is connected to the gate of the drive transistor and a storage capacitor; a second terminal of the second light emission control transistor is connected to the light-emitting structure; and a control terminal of the data write transistor, a control terminal of the compensation transistor, a control terminal of the first light emission control transistor and a control terminal of the second light emission control transistor each receive a respective control signal to control conduction between respective first and second terminals; and controlling the drive transistor to transmit the drive current to the light-emitting structure to drive the light-emitting structure to emit light comprises:
controlling conduction between the first terminal and the second terminal of the first light emission control transistor, and
controlling conduction between the first terminal and the second terminal of the second light emission control transistor, to make the power supply voltage input terminal transmit a power supply voltage to the drive transistor to generate the drive current to drive the light-emitting structure to emit light.

6. The method according to claim 5 , wherein in the first write stage of the first driving stage, the data write transistor and the compensation transistor are controlled to be on to make the data voltage signal input terminal input the voltage corresponding to the data voltage to the gate of the drive transistor; and in the first light emission stage of the first driving stage, the first light emission control transistor and the second light emission control transistor are controlled to be on.

7. The method according to claim 6 , wherein before the first write stage, the first driving stage further comprises a first initialization stage; and
wherein in the first initialization stage, a first initialization voltage is transmitted to the gate of the drive transistor and an anode of the light-emitting structure separately.

8. The method according to claim 5 , wherein in the second write stage of the second driving stage, the data write transistor is controlled to be on and the compensation transistor is controlled to be off, to make the data voltage signal input terminal input the hold voltage to the source of the drive transistor; and in the second light emission stage of the second driving stage, the first light emission control transistor and the second light emission control transistor are controlled to be on.

9. The method according to claim 8 , wherein before the second write stage, the each of the sub-driving cycles further comprises a second initialization stage; and
wherein in the second initialization stage, a second initialization voltage is transmitted to an anode of the light-emitting structure.

10. The method according to claim 5 , wherein the display panel further comprises a second drive mode, wherein the second drive mode comprises a second driving cycle, wherein duration of the first driving cycle is N times duration of the second driving cycle, the duration of the first driving stage is equal to the duration of the second driving cycle, and the second driving cycle comprises a third write stage and a third light emission stage.

11. The method according to claim 10 , wherein
in the third write stage, the data write transistor and the compensation transistor are controlled to be on, to make the data voltage signal input terminal transmit a voltage corresponding to a data voltage to the gate of the drive transistor; and
in the third light emission stage, the first light emission control transistor and the second light emission control transistor are controlled to be on.

12. The method according to claim 10 , wherein a refresh rate in the second drive mode is higher than a refresh rate in the first drive mode.

13. The method according to claim 10 , further comprising:
collecting an optical brightness value of the light-emitting structure in the first driving stage, and adjusting, according to the optical brightness value, a voltage corresponding to a data voltage transmitted by the data voltage signal input terminal to the gate of the drive transistor, to allow a brightness of the light-emitting structure to reach a target display brightness; and
collecting an optical brightness value of the light-emitting structure in the second driving stage, and adjusting, according to the optical brightness value, a hold voltage transmitted by the data voltage signal input terminal to the source of the drive transistor, to allow a brightness of th

Assignees

• Hefei Visionox Tech Co Ltd

Inventors

• He Wangwang
• Li Yonggang
• Pan Weiwei

Classifications

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G2320/0626

  for control of overall brightness · 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