Rear projection type image display device

Details Rear projection type image display device Rear projection type image display device

1998-08-06

2000-09-26

Gray, David M.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

359457, G03B 2160

Patent

active

061249696

ABSTRACT:
A rear projection type image display device includes a single projection lens, a Fresnel lens sheet, and a lenticular lens sheet 4 having black stripes in an area where when the light entered through the Fresnel lens sheet is transmitted, the outgoing light does not pass. When the angle (deg) of incidence to the lenticular lens sheet 4 is taken to be .theta., the total light transmittance (%) of the lenticular lens sheet to the light with the angle .theta. of incidence is taken to be Tt(.theta.), and the light transmittance loss by a light absorbent contained in the lenticular lens sheet is taken to be .alpha., as shown by (b), (c) in FIG. 4, in the central part of the lenticular lens sheet, if .vertline..theta..vertline.=5, the expression Tt(.theta.)>70.times.(1-.alpha.) is satisfied, and if .vertline..theta..vertline.=20, the expression Tt(.theta.)<50.times.(1-.alpha.) is satisfied.

REFERENCES:
patent: 5513037 (1996-04-01), Yoshida et al.
patent: 5592332 (1997-01-01), Nishio et al.
patent: 5661600 (1997-08-01), Mitani et al.
patent: 5870225 (1999-02-01), Ogino et al.
patent: 5880887 (1999-03-01), Goto

Affiliated with

Also associated with

Rating

Rear projection type image display device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rear projection type image display device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rear projection type image display device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2104961