Display panel, driving method therefor, and display device

Patent metadata

Field	Value
Publication number	US-11790846-B2
Application number	US-202117767061-A
Country	US
Kind code	B2
Filing date	Jun 10, 2021
Priority date	Jul 16, 2020
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A driving method of a display panel includes: determining a brightness band of the display panel, wherein brightness bands include a first brightness band to an N th brightness band, maximum grayscale brightness of the first brightness band to the N th brightness band decreases sequentially, and each brightness band includes three Gamma correction curves respectively corresponding to a first light emitting unit, a second light emitting unit, and a third light emitting unit each of an (N−M) th brightness band to the N th brightness band also corresponds to at least one duty ratio; determining an input data voltage corresponding to at least one light emitting unit based on a Gamma correction curve that corresponds to the determined brightness band and an image to be displayed; and driving the display panel to display the image based on the determined input data voltage, or the determined input data voltage and the duty ratio.

First claim

The invention claimed is:

1. A driving method of a display panel, the display panel comprising multiple pixel units arranged regularly, at least one of the multiple pixel units comprising a first light emitting unit that emits light of a first color, a second light emitting unit that emits light of a second color, and a third light emitting unit that emits light of a third color, each light emitting unit comprising a pixel circuit and a light emitting device electrically connected to the pixel circuit, and the pixel circuit comprising: a driving sub-circuit, a light emitting control sub-circuit, and a data writing sub-circuit, wherein the driving sub-circuit is electrically connected to the light emitting control sub-circuit and the data writing sub-circuit respectively, the data writing sub-circuit is configured to transmit a data voltage, the light emitting control sub-circuit is configured to control an ON duration of the driving sub-circuit, and the driving sub-circuit is configured to control a current flowing through the light emitting device according to the data voltage within the ON duration; the driving method comprising:
determining a brightness band of the display panel, wherein brightness bands comprise a first brightness band to an N th brightness band, maximum grayscale brightness of the first brightness band to the N th brightness band decreases sequentially, and each brightness band comprises three Gamma correction curves respectively corresponding to the first light emitting unit, the second light emitting unit, and the third light emitting unit; each of an (N−M) th brightness band to the N th brightness band also corresponds to at least one duty ratio, the duty ratio is a valid pulse duty ratio of a light emitting signal line, and the light emitting control sub-circuit controls the ON duration of the driving sub-circuit according to the duty ratio, wherein N is an integer greater than 1, and M is an integer greater than or equal to 0 and less than N;
determining an input data voltage corresponding to at least one light emitting unit based on a Gamma correction curve that corresponds to the determined brightness band and an image to be displayed; and
driving the display panel to display the image to be displayed based on the determined input data voltage, or, based on the determined input data voltage and the duty ratio, wherein when the display panel is driven to display each frame of an image in the (N−M) th brightness band to the N th brightness band, a current flowing through each light emitting device is greater than a preset reference current of the each light emitting device and an ON duration is less than a preset reference ON duration.

2. The driving method according to claim 1 , wherein the duty ratio corresponding to each of the (N−M) th brightness band to the N th brightness band is less than a preset reference duty ratio;
multiple transistors in the pixel circuit are all P-type transistors, and in multiple Gamma correction curves corresponding to the (N−M) th brightness band to the N th brightness band, a data voltage transmitted from the data writing sub-circuit to a pixel circuit of the first light emitting unit is less than a first reference voltage, a data voltage transmitted from the data writing sub-circuit to a pixel circuit of the second light emitting unit is less than a second reference voltage, and a data voltage transmitted from the data writing sub-circuit to a pixel circuit of the third light emitting unit is less than a third reference voltage, wherein the first reference voltage, the second reference voltage, and the third reference voltage are respectively data voltages transmitted from the data writing sub-circuit to pixel circuits of the first light emitting unit, the second light emitting unit, and the third light emitting unit when the duty ratio corresponding to each of the (N−M) th brightness band to the N th brightness band is the preset reference duty ratio.

3. The driving method according to claim 2 , wherein the data voltage transmitted from the data writing sub-circuit to the pixel circuit of the first light emitting unit is between 5/1000 and 15/1000 of the first reference voltage, the data voltage transmitted from the data writing sub-circuit to the pixel circuit of the second light emitting unit is between 10/1000 and 20/1000 of the second reference voltage, and the data voltage transmitted from the data writing sub-circuit to the pixel circuit of the third light emitting unit is between 6/1000 and 16/1000 of the third reference voltage.

4. The driving method according to claim 1 , wherein the duty ratio corresponding to each of the (N−M) th brightness band to the N th brightness band is less than a preset reference duty ratio;
multiple transistors in the pixel circuit are all N-type transistors, and in multiple Gamma correction curves corresponding to the (N−M) th brightness band to the N th brightness band, a data voltage transmitted from the data writing sub-circuit to a pixel circuit of the first light emitting unit is greater than a first reference voltage, a data voltage transmitted from the data writing sub-circuit to a pixel circuit of the second light emitting unit is greater than a second reference voltage, and a data voltage transmitted from the data writing sub-circuit to a pixel circuit of the third light emitting unit is greater than a third reference voltage, wherein the first reference voltage, the second reference voltage, and the third reference voltage are respectively data voltages transmitted from the data writing sub-circuit to pixel circuits of the first light emitting unit, the second light emitting unit, and the third light emitting unit when the duty ratio corresponding to each of the (N−M) th brightness band to the N th brightness band is the preset reference duty ratio.

5. The driving method according to claim 1 , wherein the duty ratio corresponding to each of the (N−M) th brightness band to the N th brightness band is a preset reference duty ratio, in multiple Gamma correction curves corresponding to the (N−M) th brightness band to the N th brightness band, data voltages transmitted from the data writing sub-circuit to pixel circuits of the first light emitting unit, the second light emitting unit, and the third light emitting unit are respectively a first reference voltage, a second reference voltage, and a third reference voltage; multiple transistors in the pixel circuits are all P-type transistors, and after determining the input data voltage corresponding to at least one light emitting unit, the method further comprises:
when the determined brightness band is within the (N−M) th brightness band to the N th brightness band, decreasing a duty ratio corresponding to the determined brightness band, decreasing the input data voltage corresponding to the at least one light emitting unit, and making brightness that is generated by using the decreased duty ratio and the decreased input data voltage corresponding to the at least one light emitting unit be equal to grayscale brightness that is generated by using the preset reference duty ratio and the first reference voltage, the second reference voltage, and the third reference voltage.

6. The driving method according to claim 1 , wherein the duty ratio corresponding to each of the (N−M) th brightness band to the N th brightness band is a preset reference duty ratio, in multiple Gamma correction curves corresponding to the (N−M) th brightness band to the N th brightness band, data voltages transmitted from the data writing sub-circuit to pixel circuits of the first light emitting unit, the second light emitting unit, and the third light emitting unit are respectively a first reference voltage, a second reference voltage, and a third reference voltage;

Assignees

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

Inventors

• Zhang Wenqiang
• Yan Rongjian
• Chen Wenbin

Classifications

• 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

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2320/0276

  for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction · CPC title

• G09G2320/0653

  Controlling or limiting the speed of brightness adjustment of the illumination source · CPC title