Lens array sheet, surface light source, and transmission type di

Details Lens array sheet, surface light source, and transmission type di Lens array sheet, surface light source, and transmission type di

1998-04-30

1998-11-24

Malley, Daniel P.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

359443, 359 19, G03B 2100

Patent

active

058415726

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 .mu.m. 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.

REFERENCES:
patent: 5592332 (1997-01-01), Nishio et al.

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