Backlighting device
First Claim
1. A backlighting device for use with display panels, comprising:
- a light conducting plate made of a light-transmissive material, one of major surfaces of said light conducting plate being provided with a light diffusing capability and covered with one of a specular and light diffusing/reflecting plate;
a linear light source provided in proximity to at least one end face of said light conducting plate;
directivity enhancing means provided on a light exit surface of said light conducting plate for enhancing directivity of light emitted from said light conducting plate in directions close to a line perpendicular to said exit surface, said directivity enhancing means being entirely transparent; and
at least one of a light diffusing plate and sheet interposed between said light conducting plate and said directivity enhancing means.
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Accused Products
Abstract
In a backlighting device for use with display panels that comprises a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with a specular or light diffusing/reflecting plate, and a linear light source provided in proximity to the end portion of at least one side of said light conducting plate, the improvement wherein at least one sheet that is made of a light-transmissive material and that has a multiple of raised structures having straight ridgelines at minute intervals on the same side in such a manner that the ridgelines are substantially parallel to one another or at least one sheet that is made of a light-transmissive material and that has a multiple of pyramidal or conical projecting structures at minute intervals on the same side, said projecting structures having portions of such a shape that the vertical angles are substantially the same, is provided on the exit face of the light conducting plate in such a way that either type of structures face outward.
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Citations
13 Claims
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1. A backlighting device for use with display panels, comprising:
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a light conducting plate made of a light-transmissive material, one of major surfaces of said light conducting plate being provided with a light diffusing capability and covered with one of a specular and light diffusing/reflecting plate; a linear light source provided in proximity to at least one end face of said light conducting plate; directivity enhancing means provided on a light exit surface of said light conducting plate for enhancing directivity of light emitted from said light conducting plate in directions close to a line perpendicular to said exit surface, said directivity enhancing means being entirely transparent; and at least one of a light diffusing plate and sheet interposed between said light conducting plate and said directivity enhancing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification