Lens array sheet surface light source, and transmission type display device
First Claim
1. A lens array sheet, comprising:
- a transparent substrate having a front surface and an opposite rear surface;
a lens array having lens elements arranged on said front surface of the substrate; and
a cluster of a large number of minute cluster members provided on said opposite rear surface of the substrate in a random distribution, each of said minute cluster members having a length, a width, and a height dimension, each of which is in the range of a wave length of a source light for the lens array sheet to 500 μ
m.
1 Assignment
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Accused Products
Abstract
A lens array sheet according to the present invention, comprising a transparent substrate, a lens array having lens elements that are one-dimensionally or two-dimensionally formed on the front surface of the transparent substrate, and a cluster having a large number of cluster members randomly formed in a prism shape on the rear surface of the transparent substrate, each of the length, the width, and the height of each of the cluster members being in the range from the wave length of source light to 500 μm. Thus, a lens array sheet that effectively uses light energy of the light source, maintains the light condensing effect, prevents the luminance from deteriorating, homogeneously distributes the luminance on the light emitting surface, prevents equal-thickness interference fringes and wasteful light dispersion to out of the angular range of visual angle can be provided. In addition, a surface light source having the lens array sheet is provided. Moreover, a bright transmission type display device having the surface light source is provided.
188 Citations
14 Claims
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1. A lens array sheet, comprising:
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a transparent substrate having a front surface and an opposite rear surface; a lens array having lens elements arranged on said front surface of the substrate; and a cluster of a large number of minute cluster members provided on said opposite rear surface of the substrate in a random distribution, each of said minute cluster members having a length, a width, and a height dimension, each of which is in the range of a wave length of a source light for the lens array sheet to 500 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification