Dual illumination anisotropic light emitting device

Details Dual illumination anisotropic light emitting device Dual illumination anisotropic light emitting device

2007-12-14

2009-06-02

Kim, Ellen (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S129000, C385S146000, C362S600000, C362S246000, C362S355000, C362S623000, C362S617000, C349S064000

Reexamination Certificate

active

07542635

ABSTRACT:
An enhanced electroluminescent sign containing a volumetric, anisotropic scattering element to control the angular spread of light from the sign and the spatial luminance uniformity of the sign. The anisotropic scattering element contains one or more regions of asymmetrically-shaped light scattering particles. The angular spread of light leaving a sign from a light emitting source can be efficiently controlled by using a thin, low cost, volumetric, anisotropic scattering elements to angularly and spatially distribute light, permitting the reduction in number of light sources, a reduction in power requirements, or a more tailored viewing angle.

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International Search Report and Written Opinion of the International Searching Authority for PCT/US2005/042054.

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