Electrophoretic, dual refraction frustration of total internal r

Details Electrophoretic, dual refraction frustration of total internal r Electrophoretic, dual refraction frustration of total internal r

1998-08-13

2000-05-16

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Switch

385 16, 385147, 385901, 359618, G02B 626

Patent

active

060647841

ABSTRACT:
A display device and method in which electrophoresis and/or dual prismatic surfaces are used to controllably frustrate total internal reflection at an interface between materials having different refractive indices. In one embodiment, an array of solid dielectric light fibers is surrounded by an electrophoretic medium such as acetonitrile. In the absence of electrophoretic activity, the fibers totally internally reflect light which passes into the fibers, and a reflector returns the light for diffuse emission through the fibers ends. If the fibers are subjected to electrophoretic activity their TIR capability is frustrated. A second embodiment redirects light through two prismatic surfaces in a manner which permits the TIR phenomenon to occur and to be controlled at a flat surface. A third embodiment uses both electrophoresis and dual prismatic surfaces to achieve gapless control of the TIR phenomenon at a flat surface.

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"Evanescent-wave scattering by electrophoretic microparticles: a mechanism for optical switching", Remillard et al, Applied Optics, vol. 34, No. 19, Jul. 1, 1995, pp. 3777-3785.

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