Anti-glare film and liquid crystal display apparatus

• US 20080057228A1
• Filed: 08/30/2007
• Published: 03/06/2008
• Est. Priority Date: 08/31/2006
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation), Sharp Corporation (Hon Hai Precision Industry Co., Ltd.), JGC Catalysts and Chemicals Ltd. (JGC Holdings Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation), Sharp Corporation (Hon Hai Precision Industry Co., Ltd.), Catalysts & Chemicals Industries Co. Ltd. (JGC Holdings Corporation)
• Inventors: Hirai, Toshiharu, Matsuda, Masayuki, Kikuchi, Shinji, Takahashi, Hiroshi, Horie, Wataru, Kumazawa, Mitsuaki
• Application Number:
  US11/896,262
• Publication Number:
  US 20080057228A1
• Time in Patent Office: Days
• US Class Current: 428/1.32
• CPC Class Codes: C09K 2323/033 Silicon compound, e.g. glass or organosilicon
• CPC Class Codes: G02B 5/0215 the surface having a regular structure
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/249974 Metal- or silicon-containing element

Abstract

An anti-glare film comprises an anti-glare layer, and a low-refraction-index layer formed on at least one surface thereof and comprising a low-refraction-index resin and a hollow silica particle. The film has an internal haze of 0 to 1%, a haze of 5 to 6.5%, a transmitted image clarity of 20 to 30%, and a reflected light of the film has a* of 0.5 to 1.3 and b* of −2.3 to −0.5. The particle may have a mean particle diameter of about 50 to 70 nm and a refraction index of about 1.2 to 1.25. The film may have an uneven surface, and the average inclination angle of the surface may be about 0.7 to 1°. The anti-glare layer may comprise plural polymers and have a domain formed by a phase separation, and a difference in refraction index between the polymers may be about 0 to 0.04.

Claims

1. An anti-glare film comprising:

an anti-glare layer, and

a low-refraction-index layer formed on at least one surface of the anti-glare layer and comprising a resin having a low refraction index and a hollow silica particle,

wherein the anti-glare film has an internal haze of 0 to 1%, a haze of 5 to 6.5%, a transmitted image clarity of 20 to 30%, and a reflected light on the film has a* of 0.5 to 1.3 and b* of −

2.3 to −

0.5.

2. An anti-glare film according to claim 1, wherein the hollow silica particle has a mean particle diameter of 50 to 70 nm and a refraction index of 1.2 to 1.25, and the low-refraction-index layer has a refraction index of 1.35 to 1.39.

3. An anti-glare film according to claim 1, which has an uneven surface structure and the average inclination angle of the uneven surface is 0.7 to 1°

.

4. An anti-glare film according to claim 3, wherein the mean distance between two adjacent projections of the uneven surface structure is 100 to 150 nm.

5. An anti-glare film according to claim 4, wherein the projection comprises a domain, and not less than one uneven part is further formed in the domain.

6. An anti-glare film according to claim 1, wherein the layer having a low refraction index has a thickness of 80 to 100 nm.

7. An anti-glare film according to claim 1, wherein the anti-glare layer comprises a plurality of polymers and has a domain formed by a phase separation of the polymers, and a difference in refraction index between the polymers is 0 to 0.04.

8. An optical member comprising

a polarizing plate, and

an anti-glare film recited in claim 1,

wherein the anti-glare film is laminated on at least one surface of the polarizing plate.

9. A liquid crystal display apparatus comprising an anti-glare film recited in claim 1.

10. A liquid crystal display apparatus according to claim 9, which further comprises a prism sheet comprising a prism unit having a cross section which is an approximately isosceles triangle.