Enhanced electroluminescent sign
OwnerTerence Yeo, Zane Colemaninventors
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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.
Claims30
An electroluminescent sign comprising:
- a) at least one light emitting source;
- b) a first means for displaying a first set of images or indicia;
- c) a light transmitting region comprising a first anisotropic scattering region 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 and one or more of the first dispersed phase domains are non-spherical in shape disposed to receive light from the light emitting source and scatter light to the means for displaying images or indicia.
Dependencies are inferred from the claim text.