# US 8,570,474 B2 · Anti-reflection film

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- Number: US 8,570,474 B2
- Document ID: US8570474B2
- Status: Granted
- Kind: B2
- Application number: 13/051,772
- Filed: 2011-03-18
- Published: 2011-07-07
- Granted: 2013-10-29
- Earliest claimed: 2008-09-30
- Assignees: Toppan Printing Co., Ltd.
- Applicants: Toshiaki Yoshihara; Eiichi Higashikawa; Naoyuki Shibayama
- Inventors: Toshiaki Yoshihara; Eiichi Higashikawa; Naoyuki Shibayama
- Web page: https://patentgrep.com/patent/US8570474B2

## CPC

- G02B 1/111: using layers comprising organic materials
- G02B 1/113: using inorganic layer materials only
- G02B 1/16: having an anti-static effect, e.g. electrically conducting coatings
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- G02F 1/133502: {Antiglare, refractive index matching layers}
- Y10T 428/31663: As siloxane, silicone or silane
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention provides an anti-reflection film which provides not only sufficient anti-reflection properties and antistatic properties but also excellent contrast in a bright place and excellent contrast in a dark place especially applied on a surface of a transmissive LCD. The anti-reflection film has an antistatic hard coat layer and a low refractive index layer in order on at least one surface of a transparent substrate, average luminous reflectance in the range of 0.5-1.5% on a surface of the low refractive index layer side, haze equal to or less than 0.5%, parallel light transmittance in the range of 94.0-96.5%, and an absorption loss in average luminous transmittance in the range of 0.5-3.0%.

## Claims

### Claim 1

An anti-reflection film comprising:
a transparent substrate;
an antistatic hard coat layer; and
a low refractive index layer,
wherein said antistatic hard coat layer and said low refractive index layer is formed on at least one surface of said transparent substrate, the refractive index of the low refractive index layer is lower than a refractive index of the antistatic hard coat layer, said antistatic hard coat layer has conductive inorganic particles of which content ratio are less than 5 wt %, and
a difference between the maximum and the minimum absorption loss in light transmittance of said anti-reflection film at various wavelengths in the visible light region is in the range of 0.5-4.0%, and absorption losses in light transmittance of said anti-reflection film at wavelengths of 450 nm, 550 nm and 650 nm, Q450, Q550 and Q650 respectively, satisfies a relation Q450<Q550<Q650.

### Claim 2 (depends on 1)

The anti-reflection film according to claim 1, wherein said antistatic hard coat layer includes at least one of antimony-doped tin oxide (ATO), phosphor-doped tin oxide (PTO) and fluorine-doped tin oxide (FTO).

### Claim 3 (depends on 1)

The anti-reflection film according to claim 1, wherein said low refractive index layer has surface resistivity in the range of 1.0×106 to 1.0×1011 Ω/cm2.

### Claim 4 (depends on 1)

The anti-reflection film according to claim 1, wherein a hue of reflection on a surface of said low refractive index layer in L*a*b* color coordinate system satisfies 0.0≦a*≦3.0 and −3.0≦b*≦3.0.

### Claim 5 (depends on 1)

A polarizing plate comprising:
the anti-reflection film according to claim 1;
a polarizing layer; and
a second transparent substrate,
said polarizing layer being formed on a surface of said anti-reflection film opposite from a side on which said low refractive index layer is formed, and said second transparent substrate being arranged on said polarizing layer.

### Claim 6 (depends on 5)

A transmissive liquid crystal display device comprising:
the polarizing plate according to claim 5;
a liquid crystal cell;
a second polarizing plate; and
a backlight unit,
said polarizing plate, said liquid crystal cell, said second polarizing plate and said backlight unit being arranged in this order.