White organic light-emitting diode display substrate including switching TFT and light-shielding layer arranged to prevent negative drift

Patent metadata

Field	Value
Publication number	US-12329006-B2
Application number	US-202318354218-A
Country	US
Kind code	B2
Filing date	Jul 18, 2023
Priority date	Dec 14, 2017
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

An OLED display substrate, a manufacturing method and a display device are provided. The OLED display substrate includes a base substrate and a plurality of pixel units arranged on the base substrate, each pixel unit includes a plurality of subpixel units, and each subpixel unit includes a switching TFT and a bottom-emission OLED, the OLED display substrate further includes a light-shielding layer arranged between the OLED and the switching TFT, and an orthogonal projection of the light-shielding layer onto the base substrate completely covers an orthogonal projection of a semiconductor region of the switching TFT onto the base substrate.

First claim

What is claimed is:

1. An organic light-emitting diode (OLED) display substrate, comprising:
a base substrate;
a plurality of pixel units arranged on the base substrate, wherein each pixel unit of the plurality of pixel units comprises a plurality of subpixel units, and at least one of the plurality of subpixel units comprises a switching thin film transistor (TFT);
wherein the OLED display substrate further comprises a light-shielding layer arranged between an OLED and the switching TFT, and an orthogonal projection of the light-shielding layer onto the base substrate completely covers an orthogonal projection of a semiconductor region of the switching TFT onto the base substrate, wherein each pixel unit of the plurality of pixel units comprises a red subpixel unit, a green subpixel unit, a blue subpixel unit and a white subpixel unit, the red subpixel unit comprises a red color filter and a first switching TFT, the green subpixel unit comprises a green color filter and a second switching TFT, the blue subpixel unit comprises a blue color filter and a third switching TFT, the white subpixel unit comprises a fourth switching TFT;
wherein the light-shielding layer covers at least one of an orthogonal projection of a semiconductor region of the first switching TFT in the red subpixel unit onto the base substrate, an orthogonal projection of a semiconductor region of the second switching TFT in the green subpixel unit onto the base substrate, an orthogonal projection of a semiconductor region of the third switching TFT in the blue subpixel unit onto the base substrate, or an orthogonal projection of a semiconductor region of the fourth switching TFT in the white subpixel unit onto the base substrate;
wherein a color filter in a first color and a color filter in a second color are arranged at a region where each pixel unit of the plurality of pixel units is located, the color filter in the first color is configured to filter out a blue light beam, and the color filter in the second color is configured to allow the blue light beam to pass therethrough.

2. The OLED display substrate according to claim 1 , wherein the light-shielding layer is created from a same layer as the color filter in the first color.

3. The OLED display substrate according to claim 1 , wherein the first color is red or green, and the second color is blue.

4. The OLED display substrate according to claim 1 , wherein in each pixel unit of the plurality of pixel units, the switching TFT of each subpixel unit of the plurality of subpixel units is arranged adjacent to the color filter in the first color, and the light-shielding layer is connected to the color filter in the first color.

5. The OLED display substrate according to claim 1 , wherein
the light-shielding layer comprises a first light-shielding layer and a second light-shielding layer;
the first light-shielding layer is connected to the color filter in the first color, and an orthogonal projection of the first light-shielding layer onto the base substrate completely covers an orthogonal projection of a semiconductor region of the switching TFT of a subpixel unit in the first color onto the base substrate; and
the second light-shielding layer is spaced apart from the color filter in the second color, and an orthogonal projection of the second light-shielding layer onto the base substrate completely covers the orthogonal projection of the semiconductor region of the switching TFT of the subpixel unit in the second color onto the base substrate.

6. The OLED display substrate according to claim 5 , wherein the white subpixel unit further comprises a white color filter
the red color filter, the green color filter, the blue color filter and the white color filter are arranged in one row and four columns;
the first light-shielding layer comprises a red light-shielding layer and a first green light-shielding layer;
the red light-shielding layer is connected to the red color filter, and an orthogonal projection of the red light-shielding layer onto the base substrate completely covers an orthogonal projection of a semiconductor region of the first switching TFT of the red subpixel unit onto the base substrate;
the first green light-shielding layer is connected to the green color filter, and an orthogonal projection of the first green light-shielding layer onto the base substrate completely covers an orthogonal projection of a semiconductor region of the second switching TFT of the green subpixel unit onto the base substrate;
the second light-shielding layer is a red light-shielding layer or a second green light-shielding layer; and
an orthogonal projection of the second green light-shielding layer onto the base substrate completely covers orthogonal projections of semiconductor regions of the third and fourth switching TFTs of the blue subpixel unit and the white subpixel unit onto the base substrate, and the second green light-shielding layer is spaced apart from the blue color filter and the white color filter.

7. The OLED display substrate according to claim 6 , wherein the second green light-shielding layer is spaced apart from the first green light-shielding layer.

8. The OLED display substrate according to claim 6 , wherein the second green light-shielding layer is connected to the first green light-shielding layer.

9. The OLED display substrate according to claim 1 , wherein the OLED is a bottom-emission OLED.

10. The OLED display substrate according to claim 6 , wherein the white color filter film is a transparent film, or the white color filter is absent film.

11. The OLED display substrate according to claim 1 , wherein the light-shielding layer and a color filter corresponding to at least one of the plurality of subpixel units are a continuous layer.

12. The OLED display substrate according to claim 1 , wherein each subpixel unit of the plurality of subpixel units further comprises a color filter unit corresponding to a color of the subpixel unit, the light-shielding layer and the color filter unit corresponding to at least one of the plurality of subpixel units are in a same layer and have a same material;
wherein in each pixel unit of the plurality of pixel units, the switching TFT of each subpixel unit of the plurality of subpixel units is arranged at a same side of a region where the color filter unit is located.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Wang Dongfang
• Su Tongshang
• Wang Ming
• Zhao Ce
• Zhou Bin

Classifications

• H10K2102/103

  comprising indium oxides, e.g. ITO · CPC title

• H10K59/1213

  the pixel elements being TFTs · CPC title

• H10K59/126

  Shielding, e.g. light-blocking means over the TFTs · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title