Display substrate and display device

Patent metadata

Field	Value
Publication number	US-12550574-B2
Application number	US-202117800022-A
Country	US
Kind code	B2
Filing date	Nov 9, 2021
Priority date	Feb 5, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

Provided are a display substrate, and a display device. The display substrate includes a base substrate and a plurality of pixel units on the base substrate. Each of the pixel units includes a plurality of sub-pixels, the pixel units include a target pixel unit, the target pixel unit includes target sub-pixels, the target sub-pixel includes a pixel driving circuit and a light-emitting unit capable of emitting light under the drive of the pixel driving circuit, the target sub-pixel further includes a photoresistor, the photoresistor is electrically connected to the pixel driving circuit, and the resistance value of the photoresistor increases as light intensity decreases. According to the present disclosure, the pixel driving circuit includes a photoresistor, and the resistance value of the photoresistor decreases as light intensity increases. As the luminous efficiencies of sub-pixels of different colors under different light intensities are different, the photoresistor is provided to provide different resistance values under different light intensities so to adjust the resistance, and balance the luminous efficiencies of sub-pixels of different colors under different light intensities, thus improving the display effect.

First claim

What is claimed is:

1 . A display substrate, comprising a base substrate and a plurality of pixel units on the base substrate, wherein each of the pixel units comprises a plurality of sub-pixels, the pixel units comprise a target pixel unit, the target pixel unit comprises target sub-pixels, the target sub-pixel comprises a pixel driving circuit and a light-emitting unit capable of emitting light under the drive of the pixel driving circuit, the target sub-pixel further comprises a photoresistor, the photoresistor is electrically connected to the pixel driving circuit, and the resistance value of the photoresistor increases as light intensity decreases;
wherein the display substrate comprises a display area and a non-display area, the display area has a power supply signal line, the power supply signal line extends in a first direction, the power supply signal line has an input end and an output end located in the non-display area, the target pixel unit comprises a first target pixel unit and a second target pixel unit, the distance between the first target pixel unit and the input end of the power supply signal line in the first direction is less than the distance between the second target pixel unit and a target edge of the display substrate; wherein the first target pixel unit comprises first target sub-pixels, the second target pixel unit comprises second target sub-pixels, the luminous colors of the first target sub-pixel and the second target sub-pixel are the same, and under the same light intensity, the resistance value of the photoresistor corresponding to the first target sub-pixel is greater than the resistance value of the photoresistor corresponding to the second target sub-pixel.

2 . The display substrate according to claim 1 , wherein the resistance value of the photoresistor decreases as light intensity increases.

3 . The display substrate according to claim 1 , wherein the light-emitting unit of the target sub-pixel comprises a first electrode, a second electrode, and a light-emitting layer located between the first electrode and the second electrode, and the material of the light-emitting layer comprises a phosphorescent light-emitting material.

4 . The display substrate according to claim 3 , wherein the sub-pixels of the pixel unit comprise a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the target sub-pixel comprises at least one of a red sub-pixel and a green sub-pixel.

5 . The display substrate according to claim 4 , wherein the target sub-pixel further comprises a blue sub-pixel, wherein under the same light intensity, the resistance value of the photoresistor comprised in the blue sub-pixel is less than the resistance value of the photoresistor corresponding to the red sub-pixel and the resistance value of the photoresistor corresponding to the green sub-pixel in the same target pixel unit.

6 . The display substrate according to claim 1 , wherein the display substrate comprises a first display area and a second display area, the distance in the first direction between the first display area and the input end of the power supply signal line is less than the distance between the second display area and the target edge of the display substrate, the pixel units in the first display area are all the first target pixel units, and the pixel units in the second display area are all the second target pixel units.

7 . The display substrate according to claim 1 , wherein a light-emitting unit of the target sub-pixel comprises a first electrode, a light-emitting layer and a second electrode, the first electrode comprises a first portion connected to the pixel driving circuit and a second portion connected to the light-emitting layer, the photoresistor is provided integrally with the first electrode, and an orthographic projection of the photoresistor onto the base substrate is separated from an orthographic projection of the first portion onto the base substrate, and the orthographic projection of the photoresistor onto the base substrate is separated from an orthographic projection of the second portion onto the base substrate.

8 . The display substrate according to claim 7 , wherein the first electrode further comprises a third portion, the third portion is located between the first portion and the second portion and is connected to both the first portion and the second portion, the third portion comprises a first sub-pattern and a second sub-pattern which are arranged at intervals, the first sub-pattern is connected to the first portion, the second sub-pattern is connected to the second portion, the first sub-pattern and the second sub-pattern are both connected to a photosensitive layer, the resistivity of a photosensitive material of the photosensitive layer increases as light intensity decreases, wherein the photosensitive layer, the first sub-pattern and the second sub-pattern form the photoresistor.

9 . The display substrate according to claim 8 , wherein the first sub-pattern comprises a plurality of first tooth-shaped structures, the second sub-pattern comprises a plurality of second tooth-shaped structures, the first tooth-shaped structures and the second tooth-shaped structures are arranged in a staggered manner, the photosensitive layer is located on a side of the first electrode away from the base substrate, and an orthographic projection of the photosensitive layer onto the base substrate overlaps with an orthographic projection of the first tooth-shaped structures and the second tooth-shaped structures onto the base substrate.

10 . The display substrate according to claim 9 , wherein the orthographic projection of the photosensitive layer onto the base substrate is separated from an orthographic projection of a part of the first sub-pattern other than the first tooth-shaped structures onto the base substrate, and the orthographic projection of the photosensitive layer onto the base substrate is separated from an orthographic projection of a part of the second sub-pattern other than the second tooth-shaped structures onto the base substrate.

11 . The display substrate according to claim 8 , wherein the first electrode further comprises a fourth portion connected to the first portion and the second portion respectively, and the fourth portion is connected in parallel with the third portion.

12 . The display substrate according to claim 1 , wherein the display substrate further comprises a pixel definition layer located on a side of the first electrode away from the base substrate and an opaque isolation structure, the isolation structure is arranged in the same layer as the pixel definition layer, and the isolation structure is located on a side of the target sub-pixel corresponding to the photoresistor away from the light-emitting layer of the target sub-pixel.

13 . The display substrate according to claim 1 , wherein the light-emitting layer of the target sub-pixel comprises a first surface close to the base substrate and a second surface away from the base substrate, and an orthographic projection of the first surface onto the base substrate is within an orthographic projection of the second surface onto the base substrate; and
the orthographic projection of the second surface onto the base substrate and the orthographic projection of the photoresistor corresponding to the target sub-pixel onto the base substrate have an overlapping area, and the orthographic projection of the first surface onto the base substrate and the orthographic projection of the photoresistor corresponding to the target sub-pixel onto the base substrate are separated.

14 . A display device comprising a display subst

Assignees

• Boe Technology Group Co Ltd

Inventors

• Du Xiaobo
• Jing Shu
• Li Yansong

Classifications

• H10K59/60 Primary

  OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/13

  comprising photosensors that control luminance · CPC title