# US 2008/0186429 A1 · Light diffuser plate surface emission light source apparatus and liquid crystal display

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- Number: US 2008/0186429 A1
- Document ID: US20080186429A1
- Status: Published application
- Kind: A1
- Application number: 12/025,134
- Filed: 2008-02-04
- Published: 2008-08-07
- Earliest claimed: 2007-02-02
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Toyohiro Hamamatsu; Takashi Sakamoto; Tomohiro Sato
- Web page: https://patentgrep.com/patent/US20080186429A1

## CPC

- G02B 5/0278: {used in transmission}
- G02B 5/0242: {by means of dispersed particles}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

To provide a light diffuser plate which is lightweight and has sufficient strength and is not deformed by heat or humidity, and also has sufficient surface hardness and is also excellent in scratch resistance. A light diffuser plate 3 of the present invention comprises a base layer 8 which is made of a resin composition containing light diffusing particles in an amount of 0.1 parts by mass or more and less than 5 parts by mass based on 100 parts by mass of a propylene polymer, and a surface layer 9 which is integrally laminated on one or both surfaces of the base layer 8, and the surface layer 9 is made of a resin composition containing particles having a volume average particle diameter of 10 to 200 μm in an amount of 5 to 50 parts by mass based on 100 parts by mass of a propylene polymer.

## Claims

### Claim 1

A light diffuser plate comprising:
a base layer which is made of a resin composition containing light diffusing particles in an amount of 0.1 parts by mass or more and less than 5 parts by mass based on 100 parts by mass of a propylene polymer, and
a surface layer which is integrally laminated on one or both surfaces of the base layer, wherein
the surface layer is made of a resin composition containing particles having a volume average particle diameter of 10 to 200 μm in an amount of 5 to 50 parts by mass based on 100 parts by mass of a propylene polymer.

### Claim 2 (depends on 1)

The light diffuser plate according to claim 1, wherein the resin composition constituting the surface layer further contains an ultraviolet absorber in an amount of 0.1 to 5 parts by mass based on 100 parts by mass of the propylene polymer.

### Claim 3 (depends on 1, 2)

The light diffuser plate according to claim 1 or 2, wherein the volume average particle diameter of the light diffusing particles is 0.5 μm or more and less than 10 μm.

### Claim 4 (depends on 1, 2)

The light diffuser plate according to any one of claims 1 to 2, wherein the thickness of the surface layer is from 10 to 500 μm and the entire thickness is from 1 to 3 mm.

### Claim 5 (depends on 1, 2)

A surface emission light source apparatus comprising the light diffuser plate according to any one of claims 1 to 2 and a plurality of light sources disposed on the back side of the light diffuser plate.

### Claim 6 (depends on 1, 2)

A liquid crystal display apparatus comprising the light diffuser plate according to any one of claims 1 to 2, a plurality of light sources disposed on the back side of the light diffuser plate, and a liquid crystal panel disposed on the front side of the light diffuser plate.