Optical film structure, manufacturing method thereof and display device

Patent metadata

Field	Value
Publication number	US-11143797-B2
Application number	US-201916614088-A
Country	US
Kind code	B2
Filing date	Mar 25, 2019
Priority date	Mar 27, 2018
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A display device is provided. The display device includes a display screen and an optical film structure arranged on a light exiting side of the display screen. The optical film structure includes a substrate layer and a first micro-lens array layer, where the substrate layer has a first surface and a second surface opposite to each other; the first micro-lens array layer is provided on at least one of the first surface and the second surface, and includes multiple micro-lenses arranged in sequence, each of the multiple micro-lenses has a size smaller than that of a sub-pixel, and edges of adjacent micro-lenses abut on each other.

First claim

What is claimed is:

1. A display device, comprising: a display screen and an optical film structure arranged on a light exiting side of the display screen, wherein the display screen comprises a plurality of sub-pixels, and the optical film structure comprises:
a substrate layer, having a first surface and a second surface opposite to each other, wherein the first surface is arranged at a side of the second surface away from the display screen, and
a micro-lens array layer, provided on at least one of the first surface and the second surface, and comprising a plurality of micro-lenses arranged in an array, wherein each of the plurality of micro-lenses has a size smaller than a size of each of the plurality of sub-pixels, and edges of the adjacent micro-lenses abut on each other; wherein:
the micro-lens array layer is arranged on the first surface; the optical film structure further comprises a diffusion layer provided on at least one of a surface of the micro-lens array layer away from the substrate layer and the second surface; and the diffusion layer comprises a plurality of uneven microstructures; or,
the micro-lens array layer is provided on each of the first surface and the second surface; the optical film structure further comprises a diffusion layer provided on a surface of the micro-lens array layer away from the substrate layer; and the diffusion layer comprises a plurality of uneven microstructures.

2. The display device according to claim 1 , wherein the micro-lens array layer is arranged on the first surface; the optical film structure comprises the diffusion layer provided on a surface of the micro-lens array layer away from the substrate layer; and the second surface is connected to the display screen.

3. The display device according to claim 2 , wherein the display screen comprises a polarizer; and the second surface is directly attached to the polarizer by suction.

4. The display device according to claim 2 , wherein the display screen comprises a polarizer; and the second surface is adhered to the polarizer.

5. The display device according to claim 1 , wherein the micro-lens array layer is provided on each of the first surface and the second surface;
the optical film structure comprises the diffusion layer provided on a surface of the micro-lens array layer away from the substrate layer; and
the display device further comprises an adhesive layer provided between the micro-lens array layer on the second surface and the display screen.

6. The display device according to claim 1 , wherein a focal length f of each of the plurality of micro-lenses satisfies:

l
*
t

2
*
A

<
f
<

t
2

,

where

A
=

3
⁢
l

2

-

25.4
PPI

,

l is an edge length of the micro-lens, t is a distance between a side of the micro-lens array layer close to the display screen and a sub-pixel of the display screen, and PPI is the quantity of the sub-pixels per inch of the display screen.

7. The display device according to claim 6 , wherein the display screen comprises an upper base substrate, a lower base substrate, a liquid crystal layer, a sub-pixel electrode layer and a polarizer; the upper base substrate and the lower base substrate are arranged opposite to each other, the liquid crystal layer is disposed between the upper base substrate and the lower base substrate; the sub-pixel electrode layer is arranged on a side of the upper base substrate close to the lower base substrate; the polarizer is arranged on a side of the upper base substrate away from the lower base substrate; and
the micro-lens array layer is arranged on the first surface; the second surface is directly attached to the polarizer by suction; and t is a sum of a thickness of the substrate layer, a thickness of the polarizer and a thickness of the upper base substrate.

8. The display device according to claim 7 , wherein the optical film structure comprises the diffusion layer provided on a surface of the micro-lens array layer away from the substrate layer.

9. The display device according to claim 1 , wherein heights and/or edge lengths of the micro-lenses are randomly distributed.

10. The display device according to claim 1 , wherein an alignment direction of the micro-lenses of the optical film structure is at an angle to an alignment direction of the sub-pixels of the display screen.

11. The display device according to claim 10 , wherein the angle is 18.4 degrees, 33.7 degrees or 45 degrees.

12. The display device according to claim 1 , further comprising:
an adhesive layer, provided between the optical film structure and the display screen, configured to adhere the optical film structure to the light exiting side of the display screen.

13. An optical film structure, comprising:
a substrate layer, having a first surface and a second surface opposite to each other, and
a micro-lens array layer, provided on at least one of the first surface and the second surface, and comprising a plurality of micro-lenses arranged in an array, wherein edges of the adjacent micro-lenses abut on each other; wherein:
the micro-lens array layer is arranged on the first surface; the optical film structure further comprises a diffusion layer provided on at least one of a surface of the micro-lens array layer away from the substrate layer and the second surface; and the diffusion layer comprises a plurality of uneven microstructures; or,
the micro-lens array layer is provided on each of the first surface and the second surface; the optical film structure further comprises a diffusion layer provided on a surface of the micro-lens array layer away from the substrate layer; and the diffusion layer comprises a plurality of uneven microstructures.

14. A method of manufacturing an optical film structure, comprising:
forming a substrate layer having a first surface and a second surface opposite to each other;
forming a micro-lens array layer on at least one of the first surface and the second surface, wherein the micro-lens array layer comprises a plurality of micro-lenses arranged in an array, and edges of the adjacent micro-lenses abut on each other; wherein:
the micro-lens array layer is arranged on the first surface; the optical film structure further comprises a diffusion layer provided on at least one of a surface of the micro-lens array layer away from the substrate layer and the second surface; and the diffusion layer comprises a plurality of uneven microstructures; or,
the micro-lens array layer is provided on each of the first surface and the second surface; the optical film structure further comprises a diffusion layer provided on a surface of the micro-lens array layer away from the substrate layer; and t

Assignees

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

Inventors

• Chen Yinwei
• Feng Xuqing
• Luo Zhenxing
• Xiao Liang
• Wang Guangquan
• Sun Haiwei
• Gao Fei

Classifications

• G02B5/0278

  used in transmission · CPC title

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02B3/0006 Primary

  Arrays (G02B3/02, G02B5/188 take precedence) · CPC title

• G02B5/021

  the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures · CPC title

• G02F1/133526

  Lenses, e.g. microlenses or Fresnel lenses · CPC title