BRIGHTNESS ENHANCEMENT FILM USING LIGHT CONCENTRATOR ARRAY
First Claim
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1. An illumination system comprising:
- (a) a light guiding plate for providing a generally Lambertian light source and (b) a brightness enhancement film comprising an array of tapered structures extending from the light input to the light output surface of the film, each said tapered structure having a light input aperture and a larger light output aperture, wherein the inner surface of each said tapered structure is adapted to reflect off-axis light incident at said input aperture to said output aperture in which said array of tapered structures comprises an array of concentrators extending between an input aperture on the input surface and an output aperture on the output surface, each said concentrator having a generally parabolic shape taken from said light input aperture to said light output aperture.
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Abstract
A brightness enhancement film comprises an array of tapered structures, each said tapered structure having a light input aperture and a larger light output aperture. The inner side-wall of each said tapered structure is adapted to reflect off-axis light from the light guiding plate incident at said input aperture to said output aperture.
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Citations
18 Claims
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1. An illumination system comprising:
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(a) a light guiding plate for providing a generally Lambertian light source and (b) a brightness enhancement film comprising an array of tapered structures extending from the light input to the light output surface of the film, each said tapered structure having a light input aperture and a larger light output aperture, wherein the inner surface of each said tapered structure is adapted to reflect off-axis light incident at said input aperture to said output aperture in which said array of tapered structures comprises an array of concentrators extending between an input aperture on the input surface and an output aperture on the output surface, each said concentrator having a generally parabolic shape taken from said light input aperture to said light output aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for enhancing luminance for a backlit display, comprising:
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(a) providing a light guiding surface having a first index of refraction n1;
(b) forming an array of tapered concentrators, each concentrator having a generally parabolic shape, wherein;
(1) the input aperture of each said concentrator is smaller than the output aperture;
(2) each said concentrator has a second index of refraction n;
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(c) disposing the input aperture of a plurality of said concentrators against said light guiding surface. - View Dependent Claims (17, 18)
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Specification