Liquid crystal color modulation displays with dyes of different orders and circuitry for providing modulated AC excitation voltage
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United States of America Patent
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Feb 22, 1994
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N/A
app pub date -
Jun 12, 1992
filing date -
Jun 12, 1992
priority date (Note) -
Expired
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Abstract
Liquid crystal display apparatus is disclosed wherein a liquid crystal mixture having incorporated therein (a) a positive order parameter dye and a negative order parameter dye, or (b) a zero order parameter dye and a positive order parameter dye, or (c) a zero order parameter dye and a negative order parameter dye, is interposed between transparent electrodes secured to a transparent superstrate and a transparent substrate. An operating voltage wave ranging between 0 volts and an operating voltage which may be as high as 15.6 volts, and of variable frequency, is applied across the transparent electrodes to produce color changes of adjustable frequency in the liquid crystal mixture. Simultaneously, a square voltage wave of 35 Hz is applied across the transparent electrodes to prevent degradation of the liquid crystal mixture. Various modifications are shown which Produce a travelling wave of color changes of adjustable frequency across the liquid crystal display.
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