1979-06-13
1981-02-24
Bauer, Edward S.
350350R, G02F 1133
Patent
active
042524172
ABSTRACT:
A liquid crystal display is described for displaying dark signs on a light background in accordance with the guest-host principle without polarizers. The display includes parallel plates the insides of which are provided with an orientation layer which produces a homoeotropic orientation in an adjacent liquid crystal mixture. The liquid crystal mixture is formed primarily of a nematic liquid crystal having a high negative dielectric anisotropy and, secondarily, of an optically active substance. The proportion of the optically active substance is smaller than the quantity which would cause a spontaneous formation of a twisted structure in the liquid crystal mixture in the field-free state. The liquid crystal mixture is thus homoeotropically oriented and transparent throughout in the field-free regions, and is planar-cholesteric and absorbing in the activated regions.
REFERENCES:
Cole et al., "Dependence of Absorption and Optical Contrast of a Dichroic Dye Guest on the Pitch of a Chiral Nemalic Host", Applied Physics Letter, vol. 31, pp. 58-59, Jul. 15, 1977.
White et al., "New Absorptive Mode Reflective Liquid-Crystal Display Device", Journal of Applied Physics, vol. 45, pp. 4718-4723, Nov. 1974.
Scheffer Terry J.
Zeller Hans R.
Bauer Edward S.
BBC Brown Boveri & Company Limited
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