Anti-reflection film and process for preparation thereof
AssigneeDai Nippon Printing Co., Ltd.
InventorsKiyotaka Takematsu, Hiroomi Katagiri
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Abstract
This invention provides an anti-reflection film for use in various displays which prevents the reflection of light on the surface and enables necessary visual information to be clearly discerned. The anti-reflection film has a hard coat layer 4, an intermediate refractive index layer 3, a high refractive index layer 2 and a low refractive index layer 1 formed in this sequence on a transparent base film 5, such that the refractive indices of the adjacent layers satisfy the relationship 2.20>refractive index of the high refractive index layer>refractive index of the intermediate refractive index layer>refractive index of the low refractive index layer >1.40.
Claims9
An anti-reflection film having an intermediate refractive index layer, a high refractive index layer and a low refractive index layer formed in this order on a transparent base film through a hard coat layer, said anti-reflection film comprising:
- the low refractive index layer comprising an SiOx layer where x is 1.5 to 4.0;
- the intermediate refractive index layer comprising a coating of a composition comprising a binder and ultrafine particles having a refractive index of 1.5 or more;
- and
- the high refractive index layer;
- and
- said anti-reflection film having:
- the relationship 2.20>refractive index of the high refractive index layer>refractive index of the intermediate refractive index layer>refractive index of the low refractive index layer>1.40;
- the thickness of each refractive index layer being 80 to 110 nm for the low refractive index layer, 30 to 110 nm for the high refractive index layer, and 50 to 100 nm for the intermediate refractive index layer;
- and
- an optical film thickness D not larger than the wavelength of visible light (D=n·d wherein n is the refractive index of the intermediate refractive index layer and d is the thickness of the intermediate refractive index layer).
An anti-reflection film having an intermediate refractive index layer, a high refractive index layer and a low refractive index layer formed in this order on a transparent base film through a hard coat layer, said anti-reflection film comprising:
- the low refractive index layer comprising an SiOx layer where x is 1.5 to 4.0;
- the intermediate refractive index layer constituted by coating a paint comprising a binder and ultrafine particles having a refractive index of 1.5 or more;
- and
- the high refractive index layer having electric conductivity;
- and
- said anti-reflection film having:
- the relationship 2.20>refractive index of the high refractive index layer>refractive index of the intermediate refractive index layer>refractive index of the low refractive index layer>1.40;
- and
- the ultrafine particles of the intermediate refractive index layer comprising ZrO2 particles.
Dependencies are inferred from the claim text.