Brightness enhancement film using light concentrator array
First Claim
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1. A brightness enhancement film comprising an array of tapered structures, 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.
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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
46 Claims
- 1. A brightness enhancement film comprising an array of tapered structures, 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.
- 8. A brightness enhancement film comprising an array of hollow, reflective cavities extending between a light input surface and a light output surface.
- 18. A brightness enhancement film comprising an array of hollow, reflective cavities extending between a light input surface and a light output surface, wherein each said hollow reflective cavity has an input aperture for accepting incident off-axis light and a larger output aperture.
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20. An illumination system comprising:
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(a) a light guiding plate for providing a generally Lambertian light source;
(b) a brightness enhancement film comprising an array of hollow, reflective cavities extending between a light input surface and a light output surface;
said input surface of said brightness enhancement film disposed proximate to said light guiding plate to receive light therefrom. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A display apparatus comprising:
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(a) a light guiding plate for providing a generally Lambertian light source;
(b) a brightness enhancement film comprising an array of hollow, reflective cavities extending between a light input surface and alight output surface, said input surface of said brightness enhancement film disposed proximate to said light guiding plate, said brightness enhancement film providing, from said output surface, a backlight illumination; and
,(c) an LCD display panel for modulating said backlight illumination to form an image.
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32. A brightness enhancement film comprising an array of concentrators extending between a light input aperture along an input surface and a light output aperture along an output surface, each said concentrator having a generally parabolic shape, wherein, for each said concentrator:
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(a) the area of its input aperture is less than the area of its output aperture;
(b) the input surface is in contact with a light guiding plate; and
(c) the index of refraction substantially equal to the index of refraction of said light guiding plate. - View Dependent Claims (33, 34)
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35. An illumination system comprising:
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(a) a light guiding plate for providing light;
(b) a brightness enhancement film comprising an array of concentrators extending between a light input aperture along an input surface and a light output aperture along an output surface, each said concentrator having a generally parabolic shape, wherein, for each said concentrator;
(1) the input aperture is less than the area of its output aperture;
(2) said input surface is in contact with said light guiding plate; and
(3) the index of refraction is substantially equal to the index of refraction of said light guiding plate.
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36. A display apparatus comprising:
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(a) a light guiding plate for providing light;
(b) a brightness enhancement film comprising an array of concentrators extending between a light input aperture along an input surface and a light output aperture along an output surface, wherein each said concentrator;
(1) has a generally parabolic shape, wherein, for each said concentrator, the area of its input aperture is less than the area of its output aperture;
(2) has an input surface is in contact with said light guiding plate; and
,(3) has an index of refraction substantially equal to the index of refraction of said light guiding plate; and
,(c) an LCD display panel for modulating said backlight illumination to form an image.
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37. A light guiding plate for providing backlighting, comprising an output surface having an array of tapered concentrators, each concentrator having a generally parabolic shape and a light input aperture and a light output aperture, wherein the input aperture of each said concentrator is smaller than the output aperture.
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38. An illumination apparatus comprising:
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(a) a light source;
(b) a brightness enhancement film comprising an array of hollow, reflective cavities extending between a light input surface and a light output surface;
said input surface of said brightness enhancement film disposed proximate to said light source.
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39. An illumination apparatus comprising:
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(a) a light source surface for providing light;
(b) a brightness enhancement film comprising an array of concentrators extending between a light input aperture along an input surface and a light output aperture along an output surface, each said concentrator having a generally parabolic shape, wherein, for each said concentrator;
(1) the area of its input aperture is less than the area of its output aperture;
(2) said input surface is in contact with said light source surface; and
,(3) the index of refraction is substantially equal to the index of refraction of said light source surface.
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40. A method for enhancing luminance for a backlit display, comprising:
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(a) providing an array of hollow, reflective cavities, each cavity having a light input aperture and a light output aperture; and
,(b) directing light to said array of cavities. - View Dependent Claims (41, 42, 43, 44)
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45. 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;
, and(3) n2 is substantially equal to n1;
(c) disposing the input aperture of a plurality of said concentrators against said light guiding surface. - View Dependent Claims (46)
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Specification