Optical film and liquid crystal display device using the film
First Claim
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1. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising:
- a light source for emitting light;
a light guide means having a top surface facing a back surface of said liquid crystal display panel and a side surface receiving said light from said light source;
a reflector means provided on a back surface of said light guide means; and
an optical film of transparent material positioned between said back surface of said liquid crystal display panel and said top surface of said light guide means, including a first surface having a wave structure including a plurality of regularly spaced isosceles triangles prisms arranged side-by-side, the prisms having smooth surfaces, and a second surface having an optically rough structure for performing diffuse transmission, wherein a top angle of said isosceles triangle prisms is in a range of 95 degrees to 120 degrees for flat, angles prism surfaces to gather light from the diffuse transmission into a desired viewing angle for the liquid crystal display panel.
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Abstract
The liminance within the viewing angle of an LCD device is increased by using an optical film of transparent material. The film has a first surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, and a second surface having an optically rough structure for performing diffuse transmission. The film may also have a first surface having a structure including a plurality of quadrangular prisms arranged side-by-side, and a second surface having an optically rough structure for performing diffuse transmission.
296 Citations
7 Claims
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1. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising:
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a light source for emitting light; a light guide means having a top surface facing a back surface of said liquid crystal display panel and a side surface receiving said light from said light source; a reflector means provided on a back surface of said light guide means; and an optical film of transparent material positioned between said back surface of said liquid crystal display panel and said top surface of said light guide means, including a first surface having a wave structure including a plurality of regularly spaced isosceles triangles prisms arranged side-by-side, the prisms having smooth surfaces, and a second surface having an optically rough structure for performing diffuse transmission, wherein a top angle of said isosceles triangle prisms is in a range of 95 degrees to 120 degrees for flat, angles prism surfaces to gather light from the diffuse transmission into a desired viewing angle for the liquid crystal display panel. - View Dependent Claims (2)
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3. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising:
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a light source for emitting light; a light guide means having a top surface facing a back surface of said liquid crystal display panel and a side surface receiving said light from said light source; a reflector means provided on a back surface of said light guide means; and two optical films of transparent material positioned between said back surface of said liquid crystal display and said top surface of said light guide means, each of said optical films including a first surface having a wave structure including a plurality of isosceles triangle prisms arranged side-by-side, the prism having smooth surfaces, and a second surface having an optically rough structure for performing diffuse transmission wherein a top angle of said isosceles triangle prisms is in a range of 95 degrees to 120 degrees for flat, angled prism surfaces to gather light from the diffuse transmission by the second surface into a desired viewing angle for the liquid crystal display panel. - View Dependent Claims (4, 5)
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6. A liquid crystal display device including a liquid crystal display panel and a back light device, said back light device comprising:
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a light source for emitting light; a light guide means having a top surface facing a back surface of said light crystal display panel and a side surface receiving said light from said light source; a reflector means provided on a back surface of said light guide means; and an optical film of transparent material positioned between said liquid crystal display panel and said light guide means, including a first surface having a structure including a plurality of quadrangular prisms, which are substantially the same size and shape, in an orderly matrix of equally spaced prisms, the prisms having smooth surfaces, and a second surface having an optically rough structure for performing diffuse transmission wherein a top angle of said quadrangular prisms is in a range of 95 degrees to 120 degrees for flat, angles sides of the prisms to gather the light from the diffuse transmission of the second surface into the desired viewing angle for the liquid crystal display device. - View Dependent Claims (7)
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Specification