Surface light source element

Details Surface light source element Surface light source element

1994-09-06

1996-08-27

Nguyen, Thong Q.

Optical: systems and elements

Diffusing of incident light

359619, 362 26, 362 31, G02B 502, F21V 704

Patent

active

055506763

ABSTRACT:
The present invention relates to a surface light source element used for a surface light source device, and in particular, to a surface light source element which can be used as a back light device for a liquid crystal display element. The surface light source element according to the invention is characterized in that at least one of the light emitting surface and the opposed surface of the transparent light guide has a directional light emitting function which radiates the incident light from the light incident surface of the transparent light guide in an oblique direction to the incident light and has a regulation function which makes the luminance of the light uniform over the light emitting surface in the whole surface thereof. According to the present invention, it is possible to provide a very thin type of a surface light source element which can produce emitted light with a uniform and high luminance.

REFERENCES:
patent: 4310219 (1982-01-01), Jaccard
patent: 4673254 (1987-06-01), Kab et al.
patent: 4729068 (1988-03-01), Ohe
patent: 4985809 (1991-01-01), Matsui et al.
patent: 5093765 (1992-03-01), Kashima et al.
patent: 5134549 (1992-07-01), Yokoyama
patent: 5178447 (1993-01-01), Murase et al.
patent: 5283673 (1994-01-01), Murase et al.
IBM Technical Disclousre Bulletin, vol. 29, No. 11, Apr. 1987, pp. 4838-4839, "Backlighting For Liquid Crystal Display".

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