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EP0350075A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal display device

Assignee: Toshiba Corp
•
Filing: 1989-07-07
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Granted: —
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Expires: 2009-07-07
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Abstract

Abstract A liquid crystal cell (5) includes first and second substrates (1a, 1b) arranged to oppose each other, first and second electrodes (7a and 7b) formed on oppos­ing surfaces of the first and second substrates (1a and 1b), respectively, and a liquid crystal composition (9) filled between the first and second substrates (1a, 1b) and arranged in a twisted mode. First and second polarizers (3, 4) are arranged on both sides of the liq­uid crystal cell (5). A first optical retardation film (10) is arranged between the first substrate (1a) and the first polarizer (3), and a second optical retarda­tion film (11) is arranged between said second substrate (1b) and said second polarizer (4). The liquid crystal cell (5) has a retardation value R0 of 0.4 to 0.85 µm, defined by an equation: Δn·d·cos²ϑ where d is a distance between the first and second substrates, Δn is an optical anisotropy of the liquid crystal composition and ϑ is a tilt angle of the liquid crystal composition.

Inventors

  • 👤 Tomiaki Intellectual Property Division Yamamoto
  • 👤 Akio Intellectual Property Division Murayama
  • 👤 Susumu Intellectual Property Division Kondo
  • 👤 Hitoshi Intellectual Property Division Hato
  • 👤 Shinichi Intellectual Property Division Kamagami
  • 👤 Shoichi Intellectual Property Division Matsumoto

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 05:01
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F2202/00; G02F2202/40; G02F2413/00; G02F2413/02; G02F2413/08

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 154 words
A liquid crystal display device comprising: (A) a liquid crystal cell including: (a) first and second substrates arranged to oppose each other, (b) first and second electrodes formed on opposing surfaces of said first and second substrates, respectively, and (c) a liquid crystal composition filled between said first and second substrates and arranged in a twisted mode; (B) first and second polarizers arranged on both sides of said liquid crystal cell; (C) a first optical retardation film arranged between said first substrate and said first polarizer, and (D) a second optical retardation film arranged between said second substrate and said second polarizer; wherein said liquid crystal cell has a retardation value R0 of 0.4 to 0.85 µm, defined by an equation: Δn·d·cos²ϑ where d is a distance between said first and second substrates, Δn is an optical anisotropy of said liquid crystal composition and ϑ is a tilt angle of said liquid crystal composition.
Claim 2
Dependent Claim 154 words
A liquid crystal display device comprising: (A) a liquid crystal cell including: (a) first and second substrates arranged to oppose each other, (b) first and second electrodes formed on opposing surfaces of said first and second substrates, respectively, and (c) a liquid crystal composition filled between said first and second substrates and arranged in a twisted mode; (B) first and second polarizers arranged on both sides of said liquid crystal cell; (C) a first optical retardation film arranged between said first substrate and said first polarizer, and (D) a second optical retardation film arranged between said second substrate and said second polarizer; wherein said liquid crystal cell has a retardation value R0 of 0.4 to 0.85 µm, defined by an equation: Δn·d·cos²ϑ where d is a distance between said first and second substrates, Δn is an optical anisotropy of said liquid crystal composition and ϑ is a tilt angle of said liquid crystal composition.
Claim 3
Dependent Claim 34 words
The device according to claim 1, characterized in that a retardation value of each of said first and second optical retardation films falls within a range of R0 × 0.3 to R0 × 1.0.
Claim 4
Dependent Claim 21 words
The device according to claim 1, characterized in that said first and second optical retardation films have the same retardation value.
Claim 5
Dependent Claim 38 words
The device according to claim 1, characterized in that said first substrate and said first optical retardation film are provided by one member, or said second substrate and said second optical retardation film are provided by one member.

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