LIQUID CRYSTAL DISPLAY DEVICE
First Claim
2. A liquid crystal display device as claimed in claim 1, wherein both of said X- and Y-electrode members are light-transparent.
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Abstract
Liquid crystal display elements formed at intersections of strip-shaped X-electrodes and Y-electrodes are actuated so as to display images. The liquid crystal mixture used consists essentially of a nematic liquid crystal having a positive dielectric anisotropy, a nematic liquid crystal having a negative dielectric anisotropy and a steroidal compound of a certain group. This liquid crystal mixture has a threshold value and is light-transparent upon application of a voltage above said threshold value. Each of said X-electrodes is sequentially addressed by an addressing pulse having a pulse height of about 2V and as biased by a d.c. bias voltage bias V from a standard level and having a duration Tw, said d.c. bias voltage V being below said threshold value. A signal pulse is supplied to each of said Y-electrodes, said signal pulse having a polarity opposite to that of said addressing pulse and a duration up to Tw and being biased by a d.c. bias voltage 2V from said standard level.
54 Citations
7 Claims
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2. A liquid crystal display device as claimed in claim 1, wherein both of said X- and Y-electrode members are light-transparent.
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3. A liquid crystal display device as claimed in claim 1, wherein said X-electrodes are light-reflective.
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4. A liquid crystal display device as claimed in claim 1, wherein said standard level is earth level.
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5. A liquid crystal display device as claimed in claim 1, wherein said nematic liquid crystal having positive dielectric anisotropy is a compound selected from the group consisting of p-alkoxybenzylidene-p'"'"''"'"'-cyanoaniline, p-cyanobenzylidene-p'"'"''"'"'-alkoxyaniline, p-alkoxYbenzylidene-p'"'"''"'"'-aminoazobenzene and n-alkyl-p-cyanobenzylidene-p'"'"''"'"'-aminocinnamate.
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6. A liqiud crystal display device as claimed in claim 1, wherein said nematic liquid crystal having negative dielectric anisotropy is a compound selected from the group consisting of anisalazine, p, p'"'"''"'"'-dialkozyazoxybenzene, p-alkoxybenzylidene-p'"'"''"'"'-acyloxyaniline and p-alkoxybenzylidene-p'"'"''"'"'-alkylaniline.
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7. A liquid crystal display device as claimed in claim 1, wherein said liquid crystal mixture comprises a p-alkoxybenzylidene-p'"'"''"'"'-cyanoaniline, a p-alkoxybenzylidene-p'"'"''"'"'-alkylaniline and a cholesterin derivative.
Specification