Backlighting device
First Claim
1. A backlighting device for display panels, comprising:
- a light-conducting plate comprising a light-transmissive material, said light-conducting plate having a light-diffusing material disposed thereon;
one of a specular reflecting plate and a light diffusing/reflecting plate that covers an entire bottom surface of the light-conducting plate; and
a linear light source provided in proximity to an end portion of at least one side of said light-conducting plate for propagating light along the entire light-conducting plate;
wherein said light-conducting plate includes an exit face opposite said bottom surface and having positioned thereon at least one film of a light-transmissive material, said film having an entrance face and an exit face, said exit face of said film being coarser grained than on said entrance face of said film, said entrance face of said film being closer to said light-conducting plate than said exit face of said film.
1 Assignment
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Accused Products
Abstract
A backlighting device for display panels operating on the edge lighting method that comprises a light conducting plate made of a light-transmissive material, a layer of light-diffusing material that partly covers one major surface of the light conducting plate, and a light diffusing/reflecting plate that covers the thus covered area of the light conducting plate. The light conducting plate is provided on its exit face with a film that is coarser grained on the exit face than on the entrance face (the side closer to the light conducting plate) and which, when provided on the exit face of the light conducting plate, will increase the luminance of light issuing from the exit face of the light conducting plate. This backlighting device produces satisfactory luminance and can be used as a high-performance model that achieves a high efficiency of power to luminance conversion at least in the direction of the line normal to the exit face.
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Citations
9 Claims
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1. A backlighting device for display panels, comprising:
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a light-conducting plate comprising a light-transmissive material, said light-conducting plate having a light-diffusing material disposed thereon; one of a specular reflecting plate and a light diffusing/reflecting plate that covers an entire bottom surface of the light-conducting plate; and a linear light source provided in proximity to an end portion of at least one side of said light-conducting plate for propagating light along the entire light-conducting plate; wherein said light-conducting plate includes an exit face opposite said bottom surface and having positioned thereon at least one film of a light-transmissive material, said film having an entrance face and an exit face, said exit face of said film being coarser grained than on said entrance face of said film, said entrance face of said film being closer to said light-conducting plate than said exit face of said film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification