Optical film, polarizing plate, liquid crystal panel, and image display apparatus

Abstract

An optical film (10), a polarizing plate, a liquid crystal panel, and an image display apparatus, wherein interference fringes can be made to be invisible, and cloudiness can be reduced. In accordance with one aspect of the present invention, there is provided an optical film including a light transmissive substrate (11); and a functional layer (12) disposed on the light transmissive substrate (11), wherein the functional layer (12) has a concavo-convex surface (12A) forming a surface of the optical film (10); assuming that a slope angle of the concavo-convex surface (12A) with respect to a film plane of the optical film in a cross section along a direction normal to the film plane is a surface angle, a rate of a region in which the surface angle is 0.05 DEG or more is 50% or more in the concavo-convex surface; and the root mean square slope R delta q of a roughness curve on the concavo-convex surface is 0.003 or less.

Description

technical field [0001] The present invention relates to an optical film, a polarizer, a liquid crystal panel and an image display device. Background technique [0002] The image display surface of image display devices such as liquid crystal display (LCD), cathode ray tube display (CRT), plasma display (PDP), electroluminescent display (ELD), field emission display (FED) is usually provided with useful Anti-reflection film and anti-glare film for suppressing the reflection of external light. [0003] The antireflection film mainly includes a translucent substrate, a hard coat layer provided on the translucent substrate, and a low-refractive index layer provided on the hard coat layer. The antireflection film reduces the reflected light itself by canceling the light reflected on the surface of the low-refractive index layer and the light reflected at the interface between the low-refractive index layer and the hard coat layer. [0004] However, such an antireflection film h...

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Problems solved by technology

[0004] However, such an antireflection film has the following problem: due to the difference in refractive index between the light-transmitting base material and the hard coat layer, the light reflected at the interface between the light-transmitting base material and the hard coat layer is different from the light reflected at the interface with a low refractive index. The light reflected from the interface between the layer and the hard coat layer interferes, resulting in a colored uneven pattern called interference fringes

However, the current situation is that the antireflection film has the problem of high manufacturing cost as described above.

In addition, the anti-glare film has unevenness to the extent that anti-glare properties can be obtained on the surface, so it has a cloudy feeling and does not have a glossy surface, so it is not a substitute for an anti-reflection film.

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