Liquid crystal color switch and method of manufacture

Details Liquid crystal color switch and method of manufacture Liquid crystal color switch and method of manufacture

2005-09-27

2005-09-27

Dudek, James A. (Department: 2871)

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Utilizing change within liquid crystal phase

C349S035000, C349S196000, C349S197000

Reexamination Certificate

active

06950171

ABSTRACT:
This invention involves one kind of liquid crystal color light switch, made especially from cholesteric liquid crystals. By changing the voltage applied, the reflection wavelength of the color light switch can be controlled, leading to a rapid change of the reflected light from red to green to blue in rapid succession, thus creating a color display. The core technology of this invention is making the voltage applied to the cholesteric liquid crystal less than the untwisted voltage and still in good focal conic state, that is the symmetric axis are in the same direction, and the pitch is varied according to the voltage applied.

REFERENCES:
patent: 4264149 (1981-04-01), de Zwart et al.
patent: 6061107 (2000-05-01), Yang et al.

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