Configurable optical filter or display
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United States of America Patent
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-
Sep 3, 1991
Grant Date -
N/A
app pub date -
Nov 6, 1990
filing date -
Nov 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A configurable display comprising a distributed Bragg reflector having a plurality of flexible, compressible polymer layers is provided. The polymer layers are transparent and comprise alternating layers of differential index of refraction material so that a reflective surface is formed at each interface between the alternating layers. The polymer layers are sandwiched between a first electrode which is transparent and a second electrode. Thickness of each of the layers is designed such that light reflecting from the reflective surfaces interferes constructively at predetermined wavelengths. The thickness of each of the layers is altered by application of a static potential between the first and second electrodes which deforms the polymer layers thereby shifting the wavelength at which constructive interference occurs. In this manner wavelength and amplitude of reflective light can be modulated by a voltage applied between the first and second electrodes.
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