Display substrate, manufacturing method thereof, and display apparatus

Patent metadata

Field	Value
Publication number	US-11088211-B2
Application number	US-201816488580-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Nov 2, 2017
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A display substrate includes a substrate, a pixel-defining layer configured to define a plurality of sub-pixel regions, and a plurality of sub-pixels having at least two colors, each arranged within each of the plurality of sub-pixel regions. The pixel-defining layer and the plurality of sub-pixels are disposed over the substrate. The pixel-defining layer includes a plurality of first pixel-defining portions and a plurality of second pixel-defining portions. Each of the plurality of first pixel-defining portions is configured to separate neighboring sub-pixels of different colors. Each of the plurality of second pixel-defining portions is configured to separate neighboring sub-pixels of the same color. At least one of the plurality of second pixel-defining portions has a smaller width than any one of the plurality of first pixel-defining portions.

First claim

The invention claimed is:

1. A display substrate, comprising:
a substrate;
a pixel-defining layer configured to define a plurality of sub-pixel regions; and
a plurality of sub-pixels having at least two colors, each arranged within each of the plurality of sub-pixel regions;
wherein:
the pixel-defining layer and the plurality of sub-pixels are disposed over the substrate; and
the pixel-defining layer comprises:
a plurality of first pixel-defining portions, each configured to separate neighboring sub-pixels of different colors; and
a plurality of second pixel-defining portions, each of the plurality of second pixel-defining portions is configured to separate neighboring sub-pixels of the same color;
wherein:
at least one of the plurality of second pixel-defining portions has a smaller width than any one of the plurality of first pixel-defining portions; and
each of the plurality of second pixel-defining portions has a smaller height than each of the plurality of first pixel-defining portions.

2. The display substrate of claim 1 , wherein each of the plurality of second pixel-defining portions has a smaller width than each of the plurality of first pixel-defining portions.

3. The display substrate of claim 2 , wherein:
each of the plurality of first pixel-defining portions has a width of larger than, or substantially equal to, 10 μm; and
each of the plurality of second pixel-defining portions has a width having a range of approximately 5-10 μm.

4. The display substrate of claim 1 , wherein:
each of the plurality of first pixel-defining portions has a height larger than 3 μm; and
each of the plurality of second pixel-defining portions has a height having a range of approximately 1-3 μm.

5. The display substrate of claim 1 , wherein each of the plurality of second pixel-defining portions has a substantially same height as each of the plurality of first pixel-defining portions.

6. The display substrate of claim 1 , wherein the display substrate is an organic light-emitting diode display substrate.

7. The display substrate of claim 6 , wherein each of any two neighboring sub-pixels having a same color contains a light-emitting layer that is not connected to one another.

8. The display substrate of claim 6 , wherein each of at least two neighboring sub-pixels having a same color contains a light-emitting layer that is connected to one another.

9. A method for manufacturing a display substrate, comprising:
providing a substrate;
forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate, wherein the pixel-defining layer define a plurality of sub-pixel regions, and at least one of the plurality of second pixel-defining portions has a smaller width than any one of the plurality of first pixel-defining portions; and
forming a plurality of sub-pixels over the substrate, such that each of the plurality of sub-pixels is arranged in in each of the plurality of sub-pixel regions, any two neighboring sub-pixels of different colors are separated by one of the plurality of first pixel-defining portions, and any two neighboring sub-pixels of a same color are separated by one of the plurality of second pixel-defining;

wherein the forming a plurality of sub-pixels over the substrate comprises:
providing an evaporation deposition mask comprising a plurality of openings, configured such that at least two neighboring sub-pixels of a same color correspond to one of the plurality of openings; and
performing an evaporation deposition process utilizing the evaporation deposition mask to form a light-emitting layer, such that the light-emitting layer of each of the at least two neighboring sub-pixels of the same color are connected.

10. The method of claim 9 , wherein in the forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate, each of the plurality of second pixel-defining portions has a smaller width than each of the plurality of first pixel-defining portions.

11. The method of claim 10 , wherein in the forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate:
each of the plurality of first pixel-defining portions has a width of larger than, or substantially equal to, 10 μm; and
each of the plurality of second pixel-defining portions has a width having a range of approximately 5-10 μm.

12. A method for manufacturing a display substrate, comprising:
providing a substrate;
forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate, wherein the pixel-defining layer define a plurality of sub-pixel regions, and at least one of the plurality of second pixel-defining portions has a smaller width than any one of the plurality of first pixel-defining portions; and
forming a plurality of sub-pixels over the substrate, such that each of the plurality of sub-pixels is arranged in in each of the plurality of sub-pixel regions, any two neighboring sub-pixels of different colors are separated by one of the plurality of first pixel-defining portions, and any two neighboring sub-pixels of a same color are separated by one of the plurality of second pixel-defining;

wherein:
in the forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate, each of the plurality of second pixel-defining portions has a smaller width than each of the plurality of first pixel-defining portion;
in the forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate:
each of the plurality of first pixel-defining portions has a width of larger than, or substantially equal to, 10 μm; and
each of the plurality of second pixel-defining portions has a width having a range of approximately 5-10 μm; and
the forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate comprises:
performing an exposure process utilizing a halftone or gray mask to form the plurality of first pixel-defining portions and the plurality of second pixel-defining portions, such that each of the plurality of second pixel-defining portions has a smaller height than each of the first pixel-defining portion.

13. The method of claim 12 , wherein:
each of the plurality of first pixel-defining portions has a height of larger than, or substantially equal to, 3 μm; and
each of the plurality of second pixel-defining portions has a height having a range of approximately 1-3 μm.

14. The method of claim 11 , wherein the forming a pixel-defining layer comprising a plurality of first pixel-defining portions and a plurality of second pixel-defining portions over the substrate comprises:
performing an exposure process utilizing a mask to form the plurality of first pixel-defining portions and the plurality of second pixel-defining portions, such that each of the plurality of second pixel-defining portions has a substantially same height than each of the first pixel-defining portion.

15. The method of claim 9 , wherein the forming a plurality of sub-pixels over the substrate comprises:
providing an evaporation deposition mask comprising a plurality of openings, configured such that neighboring sub-pixels

Assignees

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

Inventors

• Peng Chuan
• Cui Yan
• Zhang Yu

Classifications

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H01L51/56

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H01L27/3218 Primary

  Electricity · mapped topic

• H10K2102/351

  Thickness · CPC title