Optical compensation sheet, polarizing plate and liquid crystal display
AssigneeFuji Photo Film Co., Ltd.
InventorAkihiro Matsufuji
Life of this patent
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Abstract
An optical compensation sheet is provided and includes: a cellulose acylate film having optical anisotropy and meeting all of requirements represented by the following expressions (1) to (3); and an optically anisotropic layer having a slow axis orthogonal to a slow axis of the cellulose acylate film. 2.6≦X+Y<3.0 Expression (1) 0≦X≦1.8 Expression (2) 1.0≦Y<3.0 Expression (3) X represents a substitution degree of acetyl group and Y represents a total sum of substitution degrees of propionyl, butanoyl, pentanoyl and hexanoyl groups.
Claims14
An optical compensation sheet comprising a cellulose acylate film having optical anisotropy and satisfying expressions (1) to (3),
- an optically anisotropic layer having a slow axis orthogonal to a slow axis of the cellulose acylate film:
- 2.6≦X+Y<3.0 Expression (1)
- 0≦X≦1.8 Expression (2)
- 1.0≦Y<3.0 Expression (3)
- wherein X represents a substitution degree of acetyl group and Y represents a total sum of substitution degrees of propionyl, butanoyl, pentanoyl and hexanoyl groups.
An optical compensation sheet comprising:
- a cellulose acylate film having optical anisotropy;
- and
- an optically anisotropic layer having a slow axis orthogonal to a slow axis of the cellulose acylate film,
- wherein the optical compensation sheet has retardations satisfying relations (1) and (2):
- Re(446)<Re(590)<R(749) (1)
- Rth(446)>Rth(590)>Rth(749) (2)
- wherein Re(λ) is an in-plane retardation by nm at a wavelength of λ nm;
- and Rth(λ) is a thickness-direction retardation by nm at a wavelength of λ nm.
Dependencies are inferred from the claim text.