Higher transmission light control film comprising a transmissive region and an absorptive region each having a different index of refraction
First Claim
1. A collimated lighting assembly, comprising:
- a light control film, comprising;
a light input surface;
transmissive and absorptive regions, the transmissive region having an index of refraction N1, and the absorptive region having an index of refraction N2, where N1−
N2 is not less than 0.005,wherein a first interface between the transmissive region and the absorptive region makes an angle not greater than 3 degrees with a direction perpendicular to the input surface; and
a light source emitting light toward the light input surface.
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Abstract
A light control film, and light collimating assemblies and liquid crystal displays incorporating such light control films are described. The light control film includes alternating transmissive and absorptive regions, where the refractive index of each transmissive region is greater than the refractive index of each absorptive region. The absorptive regions form interfaces at angles that are close to the perpendicular to the light control film. A portion of the incident light intercepting the absorptive region undergoes Total Internal Reflection, and is transmitted through the film. The axial brightness of light passing through the film is increased, the brightness is more uniform within the viewing angle, and the viewing cutoff angle is sharpened.
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Citations
12 Claims
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1. A collimated lighting assembly, comprising:
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a light control film, comprising; a light input surface; transmissive and absorptive regions, the transmissive region having an index of refraction N1, and the absorptive region having an index of refraction N2, where N1−
N2 is not less than 0.005,wherein a first interface between the transmissive region and the absorptive region makes an angle not greater than 3 degrees with a direction perpendicular to the input surface; and a light source emitting light toward the light input surface. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A liquid crystal display, comprising:
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a light control film, comprising; alternating transmissive and absorptive regions disposed laterally within a plane defined by a light input surface and a light output surface opposite the light input surface, an index of refraction of each absorptive region being less than an index of refraction of each transmissive region by at least 0.005; a first interface between a transmissive region and a first adjacent absorptive region defining an interface angle θ
1 measured from a direction perpendicular to the plane of the film, wherein θ
1 is not greater than 3 degrees;a light source emitting light toward the light input surface; and a liquid crystal display module receiving light from the light output surface. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification