Dual illumination anisotropic light emitting device
First Claim
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1. A light emitting device providing illumination comprising:
- a) a first light emitting surface;
b) a second light emitting surface opposite the first surface;
c) at least one light emitting source comprising an array of light emitting diodes;
d) a first anisotropic backward and forward scattering region disposed in the optical path from the light source to the first light emitting surface comprising a first continuous phase material of refractive index nc1 and a first dispersed phase material of refractive index nd1 wherein |nc1−
nd1|>
0.001 along a first scattering axis and one or more of the first dispersed phase domains are asymmetric in shape;
wherein the first anisotropic backward and forward scattering region anisotropically scatters light backward toward the second light emitting surface and anisotropically scatters light forward toward the first light emitting surface, the light emitting device emits illuminating light from the first and second light emitting surfaces, and the emitted light from at least one of the light emitting surfaces provides anisotropic illumination.
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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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Citations
20 Claims
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1. A light emitting device providing illumination comprising:
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a) a first light emitting surface; b) a second light emitting surface opposite the first surface; c) at least one light emitting source comprising an array of light emitting diodes; d) a first anisotropic backward and forward scattering region disposed in the optical path from the light source to the first light emitting surface comprising a first continuous phase material of refractive index nc1 and a first dispersed phase material of refractive index nd1 wherein |nc1−
nd1|>
0.001 along a first scattering axis and one or more of the first dispersed phase domains are asymmetric in shape;wherein the first anisotropic backward and forward scattering region anisotropically scatters light backward toward the second light emitting surface and anisotropically scatters light forward toward the first light emitting surface, the light emitting device emits illuminating light from the first and second light emitting surfaces, and the emitted light from at least one of the light emitting surfaces provides anisotropic illumination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20)
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16. A multi-display device comprising:
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a) a first light emitting surface; b) a second light emitting surface opposite the first surface; c) at least one light emitting source comprising an array of light emitting diodes; d) a first anisotropic backward and forward scattering region disposed in the optical path from the light source to the first light emitting surface comprising a first continuous phase material of refractive index nc1 and a first dispersed phase material of refractive index nd1 wherein |nc1−
nd1|>
0.001 along a first scattering axis and one or more of the first dispersed phase domains are asymmetric in shape;e) a first spatial light modulator disposed to receive illumination from the first light emitting surface; f) a second spatial light modulator disposed to receive illumination from the second light emitting surface; wherein the first anisotropic backward and forward scattering region anisotropically scatters light backward toward the second light emitting surface and anisotropically scatters light forward toward the first light emitting surface, and the first and second light emitting surfaces provide anisotropic illumination and have a spatial luminance uniformity greater than 70%. - View Dependent Claims (17)
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18. A substantially planar multi-display device comprising:
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a) a first light emitting surface; b) a second light emitting surface opposite the first surface; c) at least one light emitting source comprising an array of light emitting diodes; d) an input coupling surface substantially orthogonal to the first light emitting surface disposed to receive light from at least one of the light sources; e) a first anisotropic backward and forward scattering region disposed in the optical path from the light source to the first light emitting surface comprising a first continuous phase material of refractive index nc1 and a first dispersed phase material of refractive index nd1 wherein |nc1−
nd1|>
0.001 along a first scattering axis and one or more of the first dispersed phase domains are asymmetric in shape;e) a first spatial light modulator disposed to receive illumination from the first light emitting surface; f) a second spatial light modulator disposed to receive illumination from the second light emitting surface; wherein the first anisotropic backward and forward scattering region anisotropically scatters light backward toward the second light emitting surface and anisotropically scatters light forward toward the first light emitting surface, and the first and second light emitting surfaces provide anisotropic illumination and have a spatial luminance uniformity greater than 70%. - View Dependent Claims (19)
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Specification