PRISM MATRIX WITH RANDOM PHASE STRUCTURES
First Claim
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1. A prismatic film for both concentrating the angle of illumination and diffusing the light for an LCD lightguide, comprising:
- a transparent film having an array of small prisms on a surface thereof;
at least one aspect of said prism structure varying in a random or pseudo random manner.
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Abstract
An improvement to prism films for displays that reduces the Moiré pattern effect, and also provides a light diffusion function. A prism film with many small prism units is used. The pattern of the prism film is varied, ideally with a random or pseudo random variation. The variation can be in any, some or all aspects of the prism structure. In particular, the thickness and position of the prism elements can be varied.
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Citations
10 Claims
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1. A prismatic film for both concentrating the angle of illumination and diffusing the light for an LCD lightguide, comprising:
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a transparent film having an array of small prisms on a surface thereof; at least one aspect of said prism structure varying in a random or pseudo random manner. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A prismatic film for an LCD lightguide, comprising:
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a transparent film having an array of small prisms on a surface thereof; the apexes of the prism are spaced at equal distances in one direction and are shifted randomly or pseudo randomly in a second direction normal to the first direction. - View Dependent Claims (8, 9, 10)
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Specification