JPS557701A - Electro-optic element - Google Patents

Abstract

PURPOSE: To make possible color display of low voltage by arraying the nematic liquid crystal molecules containing dichromatic dyes to a twisted structure through either of application or removal of voltage and disposing a polarizer to either incident or exit side alone.

CONSTITUTION: In the color display element making use of guest-host effect, nematic liquid crystal 5 of positive or negative dielectric anisotropy added with dichromatic dyes is put between glass plates 1, 4 provided with transparent electrodes 2, 3. In the case of positive liquid crystal, the electrodes 2, 3 whose surfaces have been friction treated are so combined that their directions become 90°. In the case of negative liquid crystal, the electrodes 2, 3 having been coated with perpendicularly orientation treating agents are provided. In the case of the positive liquid crystal, the liquid crystal becomes colorless when applied with voltage and colors while not applied with voltage and this is reversed in the case of the negative liquid crystal. In addition, a polarizer 8 is disposed on either incident light 7 side or exit light 9 side alone in parallel to the axial direction of the liquid crystal molecules which become parallel to the electrode on that side. In this way, the low voltage operation of 2/3 to 1/2 that of ordinary ones is made possible.

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