Surface illumination device suitable for a backlit display

Details Surface illumination device suitable for a backlit display Surface illumination device suitable for a backlit display

1997-04-02

1998-08-25

Lazarus, Ira S.

Illumination

Revolving

362 26, 362308, 362330, 362339, 349 57, 349 61, F21V 500, F21V 504, F21V 704

Patent

active

057976686

ABSTRACT:
A lens film provided in front of a light guide plate of a surface illuminant device comprises a base film, and a plurality of triangular parallel prisms formed in a two-dimensional arrangement on one surface of the base film integrally with the latter to form an exit surface. Each prism has a cross section of the shape of a isosceles triangle. The shape of the triangular prisms meets conditions represented by: ##EQU1## 0.5.ltoreq.R.ltoreq.1.0 where .theta.1 is a peak exit angle at which a direction, in which most part of light leaving an exit surface of a light guide plate toward the lens film travels, is inclined to a normal to an entrance surface of the lens film, .theta..sub.2 is an apex angle of the triangular prisms, and n is refractive index of the lens film. The lens film deflects incoming light so that most part of the light leaving the lens film travels in a direction substantially parallel to a normal to its imaginary exit surface, and serves to increase the head-on luminance.

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