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US 5,854,666 AGranted
Liquid crystal display device having particular twist angle, .increment..sub.n d, .increment..epsilon., and threshold voltage
AssigneeNEC Corporation
InventorEriko Fujimaki
Life of this patent
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Abstract
A TN-mode, normally-white format liquid crystal display device having high contrast and exceptional display characteristics. The angle of gradation inversion is increased and a straight-on contrast of more than 100 is obtained by setting the twist angle to 78.degree.-90.degree., preferably 84.degree.-90.degree., .DELTA..sub.n d to 0.3-0.4 .mu.m, preferably 0.35-0.38 .mu.m, and .DELTA..sub..epsilon. to at least 6.2.
Claims6
A TN mode, normally-white format liquid crystal display device, comprising:
- a base panel having a plurality of switch elements and pixel electrodes connected thereto, arranged in matrix-form and covered by a first orientation film;
- a back panel having a plurality of color filters corresponding to said pixel electrodes, and covered by a second orientation film;
- a liquid crystal layer between said base panel and said back panel;
- a first polarizing plate provided on an outside of said base panel;
- and
- a second polarizing plate provided on an outside of said back panel;
- wherein
- a twist angle of the liquid crystal layer is at least 78.degree. and at most 90.degree., a product .DELTA..sub.n d between a refractive index anisotropy .DELTA..sub.n and a thickness d of said liquid crystal layer is at least 0.3 .mu.m and at most 0.4 .mu.m, a dielectric constant anisotropy .DELTA..sub..epsilon. of the liquid crystal layer is at least 6.2, and a threshold voltage of the liquid crystal display device is at most 1.2 V.
5 more elements
A TN mode, normally-white format liquid crystal display device, comprising:
- a base panel having a plurality of switch elements and pixel electrodes connected thereto, arranged in matrix-form and covered by a first orientation film;
- a back panel having a plurality of color filters corresponding to said pixel electrodes, and covered by a second orientation film;
- a liquid crystal layer between said base panel and said back panel;
- a first polarizing plate provided on an outside of said base panel;
- and
- a second polarizing plate provided on an outside of said back panel;
- wherein
- a twist angle is at least 84.degree. and at most 90.degree., a product .DELTA..sub.n d between a refractive index anisotropy .DELTA..sub.n and a thickness d of said liquid crystal layer is at least 0.35 .mu.m and at most 0.38 .mu.m, a dielectric constant anisotropy .DELTA..sub..epsilon. is at least 6.2, and a threshold voltage is at most 1.2 V.
5 more elements
Dependencies are inferred from the claim text.