Electrophoretic, high index and phase transition control of total internal reflection in high efficiency variable reflectivity image displays
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United States of America Patent
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Apr 10, 2001
Issued Date -
N/A
app pub date -
Jun 2, 1999
filing date -
Jun 10, 1997
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Abstract
Charged particles suspended in a medium such as Fluorinert.TM. Electronic Liquid are used to electrophoretically control total internal reflection (TIR) at a retro-reflective surface formed on a high refractive index material. Prismatic structures redirect ambient light from an overhead light source toward a display image and then from the image to the region in front of the image, yielding a high contrast reflective display. A transparent planar waveguide front lights the display with sequential flashes of red, blue and green light to generate a full color display. TIR can also be controlled at retro-reflective surfaces by means of a vapor-liquid phase transition, or by changing the absorption coefficient of a material using electrical, chemical and/or electrochemical methods.
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