Variable index distributed mirror

Details Variable index distributed mirror Variable index distributed mirror

1996-07-25

1998-08-25

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349123, 349138, 349193, 349 78, G02F 11335, G02F 11337, G02F 11333, G02F 113

Patent

active

057992312

ABSTRACT:
A variable index distributed mirror is disclosed used for high resolution reflective displays that are thin and have high resolution, reflectivity and contrast; wide viewing angle; low power consumption; and low voltage operation. The mirror is electrically switchable or variable between substantially transparent and reflective states. The mirror has alternating layers of a first material having a fixed refractive index, and a second material having a variable refractive index. The second material may be a nematic liquid crystal. The alternating layers are located between a pair of electrodes. The variable refractive index approximately equals the fixed refractive index in the transparent state and differs from the fixed refractive index in the reflective state. The variable refractive index varies in response to a signal applied across the electrodes. The mirror is tuned to a particular color to form a monochrome display. Three such mirrors, each individually driven and tuned to different colors, form a color display. For a black and white monochrome display, the three mirrors are driven collectively.

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