Ferroelectric liquid crystal display device having an A.C. holding voltage

Inactive Publication Date: 2001-08-21
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, it is a very important problem how the liquid crystal display devic...

Method used

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  • Ferroelectric liquid crystal display device having an A.C. holding voltage
  • Ferroelectric liquid crystal display device having an A.C. holding voltage
  • Ferroelectric liquid crystal display device having an A.C. holding voltage

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Embodiment Construction

Before understanding a principle of the invention, a change of optical transparent intensity is explained when AC pulses are applied to a LC panel after DC voltage applied to a LC pannel as shown in FIG. 5(a) in which the cell thickness is about 1 .mu.m smaller than a pitch of a spiral alignment of the ferro-electric liquid crystal molecules so that the liquid crystal loses the spiral alignment to re-align in two bi-stable alignments are described hereinbefore.

FIG. 7 shows a change of optical transparent intensity when a voltage waveform is applied to the LC panel. A vertical axis shows optical transparent intensity. I.sub.ON designates the optical transparent intensity when more than V.sub.sat voltage of one polarity is applied to the LC pannel having crossed polarizing members which intercept incidence light. I.sub.OFF shows the optical transparent intensity when more than V.sub.sat having another polarity is applied to the panel so that the panel becomes the most transparent cond...

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Abstract

A liquid crystal display device utilizing a ferroelectric liquid crystal, e.g., a chiral smectic liquid crystal aligned to establish two bi-stable display states. The display device is driven in a time-sharing mode. The change of the bi-stable display states is effected by applying a selected voltage to the changed ferro-electric liquid crystal. Thereafter the display state is held by applying an A.C. pulse voltage.

Description

BACKGROUND OF THE INVENTIONThis invention relates to a liquid crystal display device, the liquid crystal display device is driven by a low voltage, a power consumption thereof is very small, a whole shape is made thin and small, and it is used for a watch, calculator etc. Recently, CMOS-LSI of semiconductor is developed, and a great dimension and capacity of liquid crystal display device are developed. Accordingly, a liquid crystal display device is applied to a personal computer and OA instruments. A liquid crystal display device will be used for many kinds of information processing instruments due to a merit of being directly driven with CMOS-IC. In this case, it is a very important problem how the liquid crystal display device attains a display capacity and response time as the same level of CRT display device. The present invention provides a liquid crystal display device which is able to have a great capacity and high speed response for high level information processing instrum...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/20
CPCG09G3/2011G09G3/3629G09G3/3681G09G3/3692G09G2310/06G09G2320/028G09G2320/041G02F1/13
Inventor HARADA, TAKAMASATAGUCHI, MASAAKIIWASA, KOJI
Owner SEIKO INSTR INC
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