Prism sheet for surface light source
First Claim
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1. A surface-type prism sheet having a shape of a periodic pattern for use with a surface light source, each periodic pattern comprising:
- a plurality of surfaces extending to one direction,wherein a cross section of said each periodic pattern has at least four surface slopes extending to an orthogonal direction with respect to adjacent surface slopes of said each periodic pattern, each of said at least four surface slopes faces opposite to said adjacent surface slopes of said each periodic pattern,wherein said at least four surface slopes of said each periodic pattern include two distal surfaces having first cross sectional widths and two proximal surfaces having second cross sectional widths different from said first cross sectional widths, andwherein said first cross sectional width is longer than said second cross sectional width.
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Abstract
A periodic pattern is formed on a surface of prism sheet, and the cross section of a minimal unit 14 of the periodic pattern is shaped like an M. The M-shape includes a long positive-sloping surface, a short negative-sloping surface, a short positive-sloping surface and a long negative-sloping surface 16b. By designing the prism sheet in such a manner, a portion of the light behaving in a side mode is converted to recurrent mode light, and the surface luminance is enhanced.
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Citations
10 Claims
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1. A surface-type prism sheet having a shape of a periodic pattern for use with a surface light source, each periodic pattern comprising:
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a plurality of surfaces extending to one direction, wherein a cross section of said each periodic pattern has at least four surface slopes extending to an orthogonal direction with respect to adjacent surface slopes of said each periodic pattern, each of said at least four surface slopes faces opposite to said adjacent surface slopes of said each periodic pattern, wherein said at least four surface slopes of said each periodic pattern include two distal surfaces having first cross sectional widths and two proximal surfaces having second cross sectional widths different from said first cross sectional widths, and wherein said first cross sectional width is longer than said second cross sectional width. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A surface-type prism sheet having a shape of a periodic pattern of prisms for use with a surface light source, said prism sheet having a substantially planar bottom surface and a top surface on which said periodic pattern of prisms are disposed, each of said prisms comprising:
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a first point and a second point defining beginning and ending points of said each prism; and a V-shaped groove disposed in said each prism between said first point and said second point, wherein said V-shaped groove has a depth such that said first and second points are closer to said substantially planar surface of said prism sheet than any portion of said V-shaped groove.
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Specification