Surface light source device of side light type with belt-like di

Details Surface light source device of side light type with belt-like di Surface light source device of side light type with belt-like di

1997-11-07

2000-02-15

O'Shea, Sandra

Illumination

Revolving

362299, 362308, F21V 704

Patent

active

060244631

ABSTRACT:
In a surface light source device of side light type applied to a liquid crystal display device, etc., more specifically a surface light source device of side light type having a directivity emitting characteristic, a bright-and-dark-band contrast which is generated in a vicinity of an incidence surface is prevented. In a surface light source device of side light type, light diffusible areas composed on main-and-supplementary diffusible areas are formed on a slanted surface and an emitting surface of a light guide plate having a directivity emitting characteristic. A silver sheet is fixed to a projected portion of a prism sheet along an upper edge, and an illumination light which arrives at the upper edge from a fluorescent lamp is blocked so that the strong brightening of the upper edge is prevented. An illumination light form a lower edge is blocked by a reflector or a frame and reflected diffusively. The light diffusible area may be formed on one of the slanted surface and the emitting surface. Moreover, the light diffusible area may be formed on an additional element such as a reflection sheet.

REFERENCES:
patent: 4277817 (1981-07-01), Hehr
patent: 5178447 (1993-01-01), Murase
patent: 5283673 (1994-02-01), Murase et al.
patent: 5392199 (1995-02-01), Kashima
patent: 5600455 (1997-02-01), Ishikawa
patent: 5688035 (1997-11-01), Kashima et al.
patent: 5788356 (1998-08-01), Watai et al.

Affiliated with

Also associated with

Rating

Surface light source device of side light type with belt-like di does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Surface light source device of side light type with belt-like di, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface light source device of side light type with belt-like di will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1900386