Optical film group, display assembly and display device

Patent metadata

Field	Value
Publication number	US-11575111-B2
Application number	US-202016887438-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	Jul 31, 2019
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

A display assembly includes a display panel and at least one optical film group each disposed on a display surface. Each optical film group includes a quarter-wave plate, a reflective polarizer and an absorbing polarizer. The reflective polarizer includes a reflective portion capable of allowing light with a polarization direction parallel to a polarization axis of the reflective polarizer to pass through and reflecting light with a polarization direction perpendicular to the polarization axis. An orthographic projection of an effective light-emitting area of at least one sub-pixel is substantially within an orthographic projection of the reflective portion. The absorbing polarizer is capable of allowing light with a polarization direction parallel to a polarization axis of the absorbing polarizer to pass through and absorbing light with a polarization direction perpendicular to the polarization axis. The polarization axis of the reflective polarizer is parallel to the polarization axis of the absorbing polarizer.

First claim

What is claimed is:

1. A display assembly, comprising:
a display panel including a plurality of sub-pixels; and
at least one optical film group each disposed on a display surface of the display panel, wherein each optical film group includes a quarter-wave plate, a reflective polarizer and an absorbing polarizer arranged sequentially along a thickness direction of the display panel, wherein
the reflective polarizer includes a reflective portion capable of allowing light with a polarization direction parallel to a polarization axis of the reflective polarizer to pass through and reflecting light with a polarization direction perpendicular to the polarization axis of the reflective polarizer; and an orthographic projection of an effective light-emitting area of at least one sub-pixel on a plane parallel to the display surface of the display panel is substantially within an orthographic projection of the reflective portion on the plane;
the absorbing polarizer is capable of allowing light with a polarization direction parallel to a polarization axis of the absorbing polarizer to pass through and absorbing light with a polarization direction perpendicular to the polarization axis of the absorbing polarizer; and the polarization axis of the reflective polarizer is parallel to the polarization axis of the absorbing polarizer;
the display panel is a bottom-emitting display panel, and the at least one optical film group includes one optical film group; and
the reflective polarizer further includes a plurality of light-transmissive portions, an orthographic projection of a non-light-emitting area of each sub-pixel on the plane is substantially within an orthographic projection of a respective one of the plurality of light-transmissive portions on the plane.

2. The display assembly according to claim 1 , wherein the reflective polarizer is a wire-gird polarizer.

3. The display assembly according to claim 2 , wherein the wire-gird polarizer includes a plurality of metal wires which are arranged at equal intervals, a width of each metal wire is in a range from 50 nm to 60 nm, and a fill factor of the wire-gird polarizer is in a range from 0.4 to 0.6.

4. The display assembly according to claim 1 , wherein the orthographic projection of the reflective portion on the plane substantially coincides with the orthographic projections of effective light-emitting areas of the plurality of sub-pixels on the plane.

5. The display assembly according to claim 1 , wherein the plurality of light-transmissive portions include at least one transparent portion and/or at least one opening.

6. The display assembly according to claim 1 , wherein the display panel further includes a substrate disposed between the plurality of sub-pixels and the quarter-wave plate, wherein
the quarter-wave plate is in contact with a surface of the substrate facing away from the sub-pixels, the reflective polarizer is in contact with a surface of the quarter-wave plate facing away from the substrate, and the absorbing polarizer is in contact with a surface of the reflective polarizer facing away from the quarter-wave plate.

7. The display assembly according to claim 6 , wherein the reflective polarizer includes a transparent base and metal wires disposed on the transparent base; and
the quarter-wave plate is disposed on surfaces of the metal wires facing away from the transparent base, and the absorbing polarizer is disposed on a surface of the transparent base facing away from the metal wires.

8. The display assembly according to claim 1 , further comprising a substrate disposed between the reflective polarizer and the absorbing polarizer, wherein
the quarter-wave plate is in contact with the display surface of the display panel, the reflective polarizer is in contact with a surface of the quarter-wave plate facing away from the display panel, the substrate is in contact with a surface of the reflective polarizer facing away from the quarter-wave plate, and the absorbing polarizer is in contact with a surface of the substrate facing away from the reflective polarizer.

9. The display assembly according to claim 1 , further comprising a substrate disposed between the quarter-wave plate and the reflective polarizer, wherein
the quarter-wave plate is in contact with the display surface of the display panel, the substrate is in contact with a surface of the quarter-wave plate facing away from the display panel, the reflective polarizer is in contact with a surface of the substrate facing away from the quarter-wave plate, and the absorbing polarizer is in contact with a surface of the reflective polarizer facing away from the substrate.

10. A display device, comprising:
the display assembly according to claim 1 ; and
a driving assembly configured to provide display data and control signals to the display assembly.

11. An optical film group, wherein the optical film group is the optical film group in the display assembly according to claim 1 .

12. A display assembly, comprising:
a display panel including a plurality of sub-pixels; and
at least one optical film group each disposed on a display surface of the display panel, wherein each optical film group includes a quarter-wave plate, a reflective polarizer and an absorbing polarizer arranged sequentially along a thickness direction of the display panel, wherein
the reflective polarizer includes a reflective portion capable of allowing light with a polarization direction parallel to a polarization axis of the reflective polarizer to pass through and reflecting light with a polarization direction perpendicular to the polarization axis of the reflective polarizer; and an orthographic projection of an effective light-emitting area of at least one sub-pixel on a plane parallel to the display surface of the display panel is substantially within an orthographic projection of the reflective portion on the plane;
the absorbing polarizer is capable of allowing light with a polarization direction parallel to a polarization axis of the absorbing polarizer to pass through and absorbing light with a polarization direction perpendicular to the polarization axis of the absorbing polarizer; and the polarization axis of the reflective polarizer is parallel to the polarization axis of the absorbing polarizer;
the display panel is a top-emitting display panel, and the at least one optical film group includes one optical film group disposed on the display surface of the display panel; and
orthographic projections of non-light-emitting areas of the plurality of sub-pixels on the plane are substantially within the orthographic projection of the reflective portion on the plane.

13. The display assembly according to claim 12 , wherein the display panel has an active area, the plurality of sub-pixels are located in the active area, and the reflective portion covers the entire active area.

14. A display device, comprising:
the display assembly according to claim 12 ; and
a driving assembly configured to provide display data and control signals to the display assembly.

15. The display assembly according to claim 12 , wherein the display panel further includes a substrate disposed on surfaces of the plurality of sub-pixels facing away from the display surface, the quarter-wave plate is disposed on a side of the plurality of sub-pixels away from the substrate, the reflective polarizer is in contact with a surface of the quarter-wave plate facing away from the plurality of sub-pixels, and the absorbing polarizer is in contact with a surface of the reflective polarizer facing away from the quarter-wave plate.

16. The di

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Hu Weipin
• Yang Hong
• Wang Chun
• Wei Congcong
• Jiang Mingxiao
• Bu Qianqian
• Sun Xiao
• Qiu Yun
• Wang Dan

Classifications

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K50/86

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• G02B5/3058 Primary

  comprising electrically conductive elements, e.g. wire grids, conductive particles · CPC title

• H10K2102/3026

  Top emission · CPC title