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US 8,477,275 B2Granted
Optical film and liquid crystal display device
AssigneeFUJIFILM Corporation
InventorsHirofumi Toyama, Isao Fujiwara, Jun Takeda, Yoji Ito
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Abstract
An optical film contains a cellulose acylate film, and at least two layers of an optically anisotropic layer A and an optically anisotropic layer B, wherein the cellulose acylate film satisfies the specific formulae, Re(548) of the optically anisotropic layer A is from 80 to 190 nm and the slow axis of the optically anisotropic layer A is at 45°±10° with respect to the film conveying direction, and the optically anisotropic layer B satisfies the specific formulae.
Claims14
An optical film comprising:
- a cellulose acylate film;
- and
- at least two layers of an optically anisotropic layer A and an optically anisotropic layer B,
- wherein
- the cellulose acylate film satisfies the following formulae (I) and (II),
- Re(548) of the optically anisotropic layer A is from 80 to 190 nm and the slow axis of the optically anisotropic layer A is at 45°±10° with respect to the film conveying direction, and
- the optically anisotropic layer B satisfies the following formulae (III) and (IV):
- 0.1≦DSA≦2.0 Formula (I):
- 1.0≦DSB≦2.9 Formula (II):
- (wherein DSA represents the acetyl substitution degree, and DSB represents the benzoyl substitution degree);
- −10 nm≦Re(548)≦10 nm Formula (III):
- Nz≧10 Formula (IV):
- (wherein Re(λ) represents the in-plane retardation at a wavelength of λ, and Nz=(nx−nz)/(nx−ny), wherein nx, ny and nz represent the refractive indexes in the film conveying direction, the direction perpendicular to the film conveying direction, and the thickness direction, respectively).
10 more elements
An optical film comprising:
- an optical film C wherein a cellulose acylate film and an optically anisotropic layer c are stacked;
- and
- at least two layers of an optically anisotropic layer A and an optically anisotropic layer B,
- wherein
- Re(548) of the optical film C satisfies the range of 50 to 400 nm,
- Re(548) of the optically anisotropic layer A is from 80 to 190 nm and the slow axis of the optically anisotropic layer A is at 45°±10° with respect to the film conveying direction, and
- the optically anisotropic layer B satisfies the following formulae (III) and (IV):
- −10 nm≦Re(548)≦10 nm Formula (III):
- Nz≧10 Formula (IV):
- (wherein Re(λ) represents the in-plane retardation at a wavelength of λ, and Nz=(nx−nz)/(nx−ny), wherein nx, ny and nz represent the refractive indexes in the film conveying direction, the direction perpendicular to the film conveying direction, and the thickness direction, respectively).
7 more elements
Dependencies are inferred from the claim text.