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EP0455160A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal display device

Assignee: Sony Corp
•
Filing: 1991-04-26
•
Granted: —
•
Expires: 2011-04-26
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Abstract

Abstract A liquid crystal display device having fast response characteristics and enabling analog gray-scaleal display is provided. The liquid crystal display device is formed of a liquid crystal material having the chiral smectic C phase. The projection component on the substrates of the axial direction (Z) of a cone delineated by a liquid crystal molecule (3), and the projection component on the substrates of the axial direction (D) of the liquid crystal molecule itself (3), are adapted to be coincident with the processing direction for uniaxial orientation of the substrates, this state being monostabled as the initial state. On application of an electrical field, the liquid crystal molecule (3) is rotated along the cone and the apparent tilt angle (ϑ) as viewed on the substrate surface is continuously changed in accordance with the strength of the applied electrical field. The intensity of the transmitted light is increased continuously with increasing tilt angle to obtain the continuous gray-scale or analog gray-scale.

Inventors

  • 👤 Keiichi Nito
  • 👤 Mayumi Miyashita
  • 👤 Eriko Matsui
  • 👤 Seiichi Arakawa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 15:06
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141; G02F1/1416

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 130 words
A liquid crystal display device in which a pair of substrates processed for uniaxial orientation are arranged with the processing directions for orientation extending substantially parallel to each other, and in which a liquid crystal material having a chiral smectic C phase is charged into a space between these substrates, wherein the improvement resides in that the projection component on the substrates of the axial direction of a cone delineated by the liquid crystal molecule of a liquid crystal material having the chiral smectic C phase and the projection component on the substrates of the axial direction of the liquid crystal molecule itself are set so as to be in the same direction as the processing direction for orientation of the substrates, this state being monostabilized as the initial state.
Claim 2
Dependent Claim 30 words
The liquid crystal display device according to claim 1 wherein the processing directions for orientation of the substrates are arranged in opposition so as to be antiparallel to each other.
Claim 3
Dependent Claim 22 words
The liquid crystal display device according to claim 1 wherein the distance between a pair of substrates is 1.2 to 3 µm.
Claim 4
Dependent Claim 44 words
The liquid crystal display device according to claim 1 wherein the liquid crystal material having the chiral smectic C phase is composed of chiral liquid crystals and non-chiral liquid crystals, said non-chiral liquid crystals being the phenylpyrimidine liquid crystals and/or tricyclic difluorine liquid crystals.
Claim 5
Dependent Claim 20 words
The liquid crystal device according to claim 4 wherein the amount of the chiral component is 1 to 3 wt.%.
Claim 6
Dependent Claim 24 words
The liquid crystal display device according to claim 1 wherein the liquid crystal material charged between the substrates is turned into the monodomain structure.

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