Optical waveguide and manufacturing method thereof, display substrate and display device

• US 10,553,826 B2
• Filed: 05/27/2016
• Issued: 02/04/2020
• Est. Priority Date: 01/04/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Ye, Zhijie, Peng, Rui, Wang, Xinxin, Huang, Lei, Jia, Wenbin
• Primary Examiner(s): Nguyen, Thanh T
• Application Number:
  US15/322,534
• Publication Number:
  US 20180323402A1
• Time in Patent Office: 1,348 Days
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: G02B 1/045 Light guides
• CPC Class Codes: G02B 6/08 with fibre bundle in form of plate
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

The embodiments of the present invention provide an optical waveguide and manufacturing method thereof, display substrate and display device. The optical waveguide comprises an optical fiber array arranged on a surface; each optical fiber in the optical fiber array has a cylindrical shape; the axis of each optical fiber is perpendicular to the surface. With the effect of limitation and mixing of the optical fibers, the intensity and color of the light from the optical waveguide are basically homogeneous in the whole emitting range, effectively improving the viewing angle characteristics of the display device, and solving the problem of uneven brightness and color bias in the range of viewing angle.

Claims

1. A display substrate comprising a light output surface and an optical waveguide attached to the light output surface;

wherein the optical waveguide comprises an optical fiber array arranged on a surface of a transparent substrate;

each optical fiber in the optical fiber array has a cylindrical shape;

an axis of each optical fiber is perpendicular to the surface of the transparent substrate;

a light exit surface of each optical fiber is substantially parallel to the surface of the transparent substrate.

2. The display substrate according to claim 1, wherein the light output surface is a light output surface of an OLED array.

3. The display substrate according to claim 1, wherein the display substrate is a flexible display substrate.

4. A display device comprising the display substrate according to claim 1.

5. The display substrate according to claim 1, wherein the cylindrical shape meets D/L<

0.33;

wherein D is the diameter of the cylindrical shape, and L is the height of the cylindrical shape.

6. The display substrate according to claim 1, wherein each optical fiber in the optical fiber array is made of a first material, the cylindrical surface of each optical fiber is covered by a second material;

and wherein the refractive index of the first material is higher than the refractive index of the second material.

7. The display substrate according to claim 6, wherein the first material is Al₂O₃, MgO, Y₂O₃, CeF₃, LaF₃, SiO or YF₃;

and wherein the second material is MgF₂, SiO₂, BaF₂, AlF₃, CaF₂, LiF, Na₃AlF₆, Al₃F₁₄Na₅ or NaF.

8. The display substrate according to claim 1, wherein the optical waveguide further comprises a flexible sheet;

the flexible sheet is integrally formed with the optical fiber array, and the axis of each optical fiber is perpendicular to the surface of the flexible sheet.

9. The display substrate according to claim 8, wherein the flexible sheet and the optical fiber array are made of polycarbonate or poly(methyl methacrylate).

10. The display substrate according to claim 1, wherein the surface of the transparent substrate is a plane.

11. The display substrate according to claim 1, wherein the optical fiber array is a hexagonal array.