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Tristable liquid crystal display device

A liquid crystal display device, a tri-stable technology, applied in the directions of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of insufficient bi-stable state, insufficient threshold characteristics, unsatisfactory contrast, etc., and achieve threshold voltage control. and contrast improvement, fast response time

Inactive Publication Date: 2001-09-12
3M CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although devices using these materials exhibit the advantages of fast response and wide viewing angle, there are still many problems in the development of SSFLC devices
These problems include insufficient threshold properties, unsatisfactory contrast (due to chevron defects), and insufficient bi-stability due to difficulty in controlling alignment

Method used

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  • Tristable liquid crystal display device
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  • Tristable liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-22 and comparative example A

[0057] Examples 1-22 and Comparative Examples A and B

[0058] Liquid crystal display devices were prepared and evaluated in the following manner:

[0059] On a glass plate with an ITO film with a predetermined pattern, spin-coat a formic acid solution containing 0.5% (by weight) nylon-6,6, then dry, and orient the resulting nylon film by rubbing to form a 400 angstrom-thick alignment. Control layer. On another glass plate with an ITO film with a predetermined pattern, spin-coat a polysiloxane solution such as Techniglas TM GR651L was then thermally cured to form a 200 Angstrom thick alignment control layer. Two spacers (average size 2[mu]) were placed on a glass plate which were brought together to form blank cells with a cell gap of 2.3[mu].

[0060] A number of blank units were prepared in the above manner, and at a temperature about 5°C higher than the clearing point (the temperature from isotropic to smectic phase) of the composition, in a nitrogen atmosphere with the...

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PUM

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Abstract

A tristable liquid crystal display device comprising: (a) first and second opposing substrates, at least one substrate carrying an alignment coating and each substrate carrying at least one electrode, thereby defining one or more pixel ; (b) a tilted smectic or induced tilted smectic liquid crystal composition placed between substrates; (c) a pair of orthogonally placed polarizers, each polarizer has a polarization axis, and a polarization axis It is aligned with the zero-field optical axis of the tilted smectic or induced tilted smectic mesophase of the liquid crystal composition; the placement of the substrate aligns the liquid crystal composition, and the composition comprises at least one hand represented by the following formula (I) Sexual liquid crystal compound: R-M-N-(P) b - OCH 2 C * HF-CH 2 O(CH 2 ) a R f , wherein M, N and P are independently selected from aromatic rings, heteroaryl rings, alicyclic rings, heteroalicyclic rings, substituted aromatic rings, substituted heteroaryl rings, substituted alicyclic rings and substituted heteroalicyclic rings, each ring is Fused or non-fused rings, the rings are connected to each other by covalent bonds or organic linking groups; R is alkyl, alkenyl, alkoxy or alkoxyalkenyl; * refers to a chiral center; a is 0 or an integer of 1; b is an integer of 0 or 1; R f is a perfluoroether group.

Description

field of invention [0001] The present invention relates to a liquid crystal display device and a method of driving the same. Background of the invention [0002] Devices using liquid crystals are now used in a variety of electro-optic applications, especially those requiring small, energy-efficient, voltage-controlled light valves, such as watch and calculator displays and flat-panel displays in laptop computers and small televisions. Liquid crystal displays have many unique features, including low operating voltage and low power operation, that make liquid crystal displays the most promising non-emissive electro-optic display method currently available. [0003] A recent advance in the field of liquid crystals is the use of tilted chiral smectic liquid crystals, a class of which are known as ferroelectric liquid crystals, in devices that provide microsecond switching and bistable operation. Ferroelectric liquid crystals were discovered by R.B.Meyer et al. (J.Physique 36,1-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/141C09K19/02C09K19/04C09K19/12C09K19/30C09K19/32C09K19/34C09K19/54G02F1/13
CPCC09K19/34C09K19/3497C09K19/0266C09K19/345C09K19/04C09K19/3469C09K2323/03G02F1/13
Inventor 天野高石M·P·凯斯S·J·马丁M·D·拉得克里夫P·M·萨武D·C·斯纳斯泰德
Owner 3M CO
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