Liquid crystal display device
AssigneeFuji Photo Film Co., Ltd.
InventorsNobutaka Fukagawa, Hiromoto Haruta, Hiroaki Sata
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Abstract
A liquid crystal display device comprising a liquid crystal cell, two polarizing plates having a polarizer and a protective film satisfying (1) and (2) below, and an optical compensatory film satisfying (3)-(8) below and disposed between the liquid crystal cell and the polarizer: 0 nm≦Re(λ)≦5 nm (1) −20 nm≦Rth(λ)≦20 nm (2) 20 nm<Re(548)<150 nm (3) 50 nm<Rth(548)<400 nm (4) 0.5<Re(446)/Re(548)<1 (5) 1.0<Re(628)/Re(548)<2.0 (6) 1.0<Rth(446)/Rth(548)<2.0 (7) 0.5<Rth(628)/Rth(548)<1.0 (8)
Claims11
A liquid crystal display device comprising a liquid crystal cell, two polarizing plates disposed on both sides of the liquid crystal cell and an optical compensatory film,
- wherein the polarizing plate comprises a polarizer and a protective film of the polarizer disposed on at least the side toward the liquid crystal cell,
- the optical compensatory film is disposed between the liquid crystal cell and the polarizer provided that the optical compensatory film and the protective film disposed on the side toward the liquid crystal cell may be the same, and
- the protective film satisfies the relation of the following formulae (1) and (2) within a wavelength range of from 400 to 700 nm and the optical compensatory film satisfies the relation of the following formulae (3) to (8):
- 0 nm≦Re(λ)≦5 nm (1)
- −20 nm≦Rth(λ)≦20 nm (2)
- 20 nm<Re(548)<150 nm (3)
- 50 nm<Rth(548)<400 nm (4)
- 0.5<Re(446)/Re(548)<1 (5)
- 1.0<Re(628)/Re(548)<2.0 (6)
- 1.0<Rth(446)/Rth(548)<2.0 (7)
- 0.5<Rth(628)/Rth(548)<1.0 (8)
- wherein Re (λ) represents an in-plane retardation at a wavelength λ and Rth(λ) represents a retardation in the thickness direction of the film at a wavelength λ.
A liquid crystal display device comprising a liquid crystal cell, two polarizing plates disposed on both sides of the liquid crystal cell and at least two optical compensatory films disposed between the polarizing plate and the liquid crystal cell,
- wherein the polarizing plate comprises a polarizer and two protective films disposed on both sides of the polarizer provided that one of the protective films on the side toward the liquid crystal cell and the optical compensatory film may be the same, and
- at least one of the protective films on the side toward the liquid crystal cell satisfies the relation of the following formulae (1) and (2) within a wavelength range of from 400 to 700 nm, one of the optical compensatory films satisfies the relation of the following formulae (9) to (12), and the other one of the optical compensatory films satisfies the following formulae (13) to (16):
- 0 nm≦Re(λ)≦5 nm (1)
- −20 nm≦Rth(λ)≦20 nm (2)
- 50 nm<Re(548)<200 nm (9)
- 30 nm<Rth(548)<150 nm (10)
- 0.5<Re(446)/Re(548)<1 (11)
- 1.0<Re(628)/Re(548)<2.0 (12)
- 0 nm≦Re(548)<10 nm (13)
- 100 nm<Rth(548)<300 nm (14)
- 1.0<Rth(446)/Rth(548)<2.0 (15)
- 0.5<Rth(628)/Rth(548)<1.0 (16)
- wherein Re(λ) represents an in-plane retardation at a wavelength λ and Rth(λ) represents a retardation in the thickness direction of the film at a wavelength λ.
Dependencies are inferred from the claim text.