Light-diffusion member, manufacturing method thereof, and display device

Patent metadata

Field	Value
Publication number	US-9274255-B2
Application number	US-201113880181-A
Country	US
Kind code	B2
Filing date	Oct 18, 2011
Priority date	Oct 21, 2010
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A light-diffusion member includes a substrate having light transparency, a plurality of light-diffusion parts formed on one surface of the substrate, and a light-absorbing layer formed in a region other than a region where the light-diffusion parts are formed, among the one surface of the substrate. Each light-diffusion part includes a light-emission end surface on the side of the substrate and a light-incident end surface of an area larger than an area of the light-emission end surface on a side opposite to the side of the substrate. The height from the light-incident end surface of the light-diffusion part to the light-emission end surface thereof is larger than the thickness of the light-absorbing layer. The plurality of light-diffusion parts are randomly arranged on the one surface of the substrate.

First claim

The invention claimed is:

1. A light-diffusion member comprising:
a substrate having light transparency;
a plurality of light-absorbing layers scattered on one surface of the substrate, the plurality of light-absorbing layers being provided in first regions of the one surface; and
a plurality of light-diffusion portions provided on second regions of the one surface, the second regions being other than the first regions, wherein
each of the plurality of light-diffusion portions includes a light-emission end surface and a light-incident end surface, the light-emission end surface being on the one surface, the light-incident end surface being opposite to the light emission end surface, the light-incident end surface including a first area, the light-emission end surface including a second area, the first area being larger than the second area,
a height from the light-incident end surface to the light-emission end surface is larger than a thickness of each of the plurality of light-absorbing layers,
the plurality of light-diffusion portions have a random shape when seen, at the one surface, along a normal direction of the one surface, and
the plurality of light-diffusion portions surround the plurality of light-absorbing layers, and are connected to each other, at the one surface when seen along the normal direction.

2. The light-diffusion member according to claim 1 ,
wherein at least one of an antireflection layer, a polarizing filter layer, an antistatic layer, a non-glare treatment layer, and an antifouling layer is provided above another surface of the substrate, the another surface being opposite to the one surface.

3. The light-diffusion member according to claim 1 ,
wherein an information input device is provided on a visible side of the light-diffusion member.

4. The light-diffusion member according to claim 1 , wherein
the light-diffusion member comprises a display, the display comprising a light source and a light modulation device, the light modulation device modulating light from the light source, the light having directivity, and
the light source emits the light.

5. The light-diffusion member according to claim 1 ,
wherein the light-diffusion member comprises a display body, the display body being a liquid crystal display element.

6. A method of forming a light-diffusion member, the method comprising:
forming a plurality of light-absorbing layers that include at least one opening portion on one surface of a substrate, the substrate having light transparency;
forming a negative photosensitive resin layer having light transparency to cover the plurality of light-absorbing layers on the one surface;
irradiating diffusion light onto the negative photosensitive resin layer through the at least one opening portion, the irradiation being performed from another surface of the substrate, the another surface being opposite to the one surface on which the plurality of light absorbing layers and the negative photosensitive resin layer are formed; and
developing the negative photosensitive resin layer irradiated with the diffusion light to form, on the one surface, a plurality of light-diffusion portions, each of the plurality of light-diffusion portions including a light-emission end surface and a light-incident end surface, the light-emission end surface being on the one surface, the light-incident end surface being opposite to the light emission end surface, the light-incident end surface including a first area, the light-emission end surface including a second area, the first area being larger than the second area, wherein
the development is performed such that the plurality of light-diffusion portions surround the plurality of light-absorbing layers, and are connected to each other, at the one surface when seen along the normal direction.

Assignees

• Yamamoto Emi
• Kanno Toru
• Yoshida Hidefumi
• Maeda Tsuyoshi
• Kamada Tsuyoshi
• Sharp Kk

Inventors

• Yamamoto Emi
• Kanno Toru
• Yoshida Hidefumi
• Maeda Tsuyoshi
• Kamada Tsuyoshi

Classifications

• G02F1/133504

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

• G02B5/0268 Primary

  characterized by the fabrication or manufacturing method · CPC title

• B29D11/00798

  Producing diffusers · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title