Light diffusion member, method for producing same, and display device

Patent metadata

Field	Value
Publication number	US-9638840-B2
Application number	US-201214116835-A
Country	US
Kind code	B2
Filing date	May 10, 2012
Priority date	May 13, 2011
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A light diffusion member includes a light transmissive substrate, a plurality of light diffusion sections formed on one surface of the substrate, a light shielding layer formed in a region other than formation regions of the light diffusion sections on the one surface of the substrate, and light scattering bodies. The light diffusion sections have a light emitting end surface on the substrate side and a light incident end surface having an area greater than an area of the light emitting end surface on a side opposite to the substrate side. A height from the light incident end surface to the light emitting end surface of each of the light diffusion sections is greater than a thickness of the light shielding layer. The light scattering bodies are disposed further on a light emitting side than the light diffusion sections.

First claim

The invention claimed is:

1. A light diffusion member comprising:
a light transmissive substrate;
a plurality of light shielding layers which are scatteringly provided on one surface of the light transmissive substrate;
a light diffusion section which is provided in a region other than formation regions of the plurality of light shielding layers, the light diffusion section being provided on the one surface of the light transmissive substrate; and
light scattering bodies disposed on a light emitting side of the light diffusion section; wherein
the light diffusion section includes a light emitting end surface on a substrate side of the light diffusion section and a light incident end surface including a first area greater than a second area of the light emitting end surface on a side opposite to the substrate side,
a height from the light incident end surface to the light emitting end surface of the light diffusion section is greater than a thickness of the plurality of light shielding layers,
the plurality of light shielding layers are disposed non-periodically as viewed from a normal direction of the one surface of the light transmissive substrate,
a plurality of opening portions are provided at the light incident end surface and opposite to the plurality of light shielding layers, each of the plurality of opening portions having a same shape to each of the plurality of light shielding layers, and
the light scattering bodies are provided in a separate layer provided on a second surface of the light transmissive substrate.

2. The light diffusion member according to claim 1 ,
wherein the plurality of light shielding layers are scatteringly disposed as viewed from the normal direction of the one surface of the substrate, and
wherein the light diffusion section is continuously provided in a region other than the formation regions of the light shielding layers.

3. The light diffusion member according to claim 2 ,
wherein the plurality of light shielding layers have the same shape to each other, as viewed from the normal direction of the one surface of the substrate.

4. The light diffusion member according to claim 2 ,
wherein the plurality of light shielding layers have at least one of sizes and shapes of a plurality of different types, as viewed from the normal direction of the one surface of the substrate.

5. The light diffusion member according to claim 1 ,
wherein hollow portions partitioned by a formation region of the light diffusion section are provided in the formation regions of the light shielding layers, and
wherein air is present in the hollow portions.

6. The light diffusion member according to claim 1 ,
wherein planar shapes of the light shielding layers as viewed from the normal direction of the one surface of the substrate are circular, elliptical, or polygonal.

7. A display device comprising:
a display body; and
a viewing angle widening member which is provided on a viewing side of the display body, makes an angular distribution of light incident from the display body wider than before being incident, and emits the light,
wherein the viewing angle widening member is composed of the light diffusion member according to claim 1 .

8. The display device according to claim 7 ,
wherein the display body has a plurality of pixels forming a display image, and
wherein among the plurality of light shielding layers, a maximum pitch between adjacent light shielding layers is smaller than a pitch between the pixels of the display body.

9. The display device according to claim 7 ,
further comprising an information input device provided on the viewing side of the viewing angle widening member.

10. The display device according to claim 7 ,
wherein the display body has a light source and a light modulation element which modulates light from the light source, and
wherein the light source emits light having directivity.

11. The display device according to claim 7 ,
wherein the display body is a liquid crystal display element.

12. The display device according to claim 7 , further comprising:
a polarizing plate; and
a liquid crystal panel; wherein
the viewing angle widening member is mounted on the polarizing plate and the polarizing plate is sandwiched between the viewing angle widening member and the liquid crystal panel.

13. The display device according to claim 12 , further comprising:
a backlight which is positioned on an opposite side of the liquid crystal panel from a side of the liquid crystal panel which contacts the polarizing plate.

14. The light diffusion member according to claim 1 , wherein
a third area of the plurality of opening portions is smaller than a fourth area of the plurality of light shielding layers, and
the plurality of opening portions are provided discontinuously from each other.

15. The light diffusion member according to claim 1 ,
wherein each of the plurality of opening portions is respectively opposite to a part of each of the plurality of light shielding layers.

Assignees

• Yamamoto Emi
• Maeda Tsuyoshi
• Kanno Toru
• Sharp Kk

Inventors

• Yamamoto Emi
• Maeda Tsuyoshi
• Kanno Toru

Classifications

• G02B5/0278

  used in transmission · CPC title

• B32B2307/21

  Anti-static · CPC title

• G02B5/02 Primary

  Diffusing elements; Afocal elements · CPC title

• B32B27/286

  comprising polysulphones; polysulfides · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title