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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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First Claim