Diffusing sheet, surface light source unit, and transmission...

Details Diffusing sheet, surface light source unit, and transmission... Diffusing sheet, surface light source unit, and transmission...

2005-04-04

2008-08-05

Lee, Diane I. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S453000, C359S457000, C359S460000, C359S619000, C359S626000

Reexamination Certificate

active

07408708

ABSTRACT:
A diffusing sheet, a surface light source unit, and a transmission type display that can attain uniform illumination so that the brightness of light on the display screen appears uniform regardless of the position from which the display screen is observed. The diffusing sheet includes, on its light-emerging side surface, a diffusion lens array having a plurality of unit lenses, each unit lens being in a shape equivalent to a part of an elliptic cylinder having an elliptical cross section. The surface light source unit includes the diffusing sheet and a convergent sheet12that has a plurality of unit lenses121having almost trapezoidal cross sections, formed on one surface thereof. It is possible to attain uniform illumination by diffusing light from cathode ray tubes in the surface light source unit, and, at the same time, to converge the light serving as backlight to enhance optical efficiency.

REFERENCES:
patent: 5504598 (1996-04-01), Sprague et al.
patent: 5592332 (1997-01-01), Nishio et al.
patent: 5944405 (1999-08-01), Takeuchi et al.
patent: 6088158 (2000-07-01), Kimura
patent: 6404468 (2002-06-01), Niwano et al.
patent: 6707605 (2004-03-01), Sekiguchi
patent: 6707606 (2004-03-01), Watanabe et al.
patent: 2005/0146872 (2005-07-01), Chang et al.
patent: 2007/0177386 (2007-08-01), Masaki et al.
patent: 06-265732 (1994-09-01), None
patent: 10-333147 (1998-12-01), None
patent: 2001-021706 (2001-01-01), None

Affiliated with

Also associated with

Rating

Diffusing sheet, surface light source unit, and transmission... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Diffusing sheet, surface light source unit, and transmission..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffusing sheet, surface light source unit, and transmission... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4017589