Television – Video display – Projection device
Patent
1996-03-27
1998-08-18
Burgess, Glenton B.
Television
Video display
Projection device
348786, 353 74, 353 78, H04N 574
Patent
active
057964467
ABSTRACT:
A television receiver or video monitor of the back-projection type, in which a projector forms an image which can be observed on a visual display screen by rear illumination after reflection on a deflecting mirror. The projector includes in immediate proximity to the visual display screen and parallel to the latter, a reflection-transmission screen comprising a Fresnel surface, the projector, reflection-transmission screen and deflecting mirror being configured together to form an optical system such that the reflection-transmission screen reflects the rays directly emanating from the projector in the direction of the deflecting mirror and transmits these rays after their reflection on this deflecting mirror. The Fresnel surface includes striations of triangular cross-section, these striations locally forming prisms and capable of reflecting the rays which strike them when the angle of incidence of the rays are greater than a predetermined value and of transmitting the rays in an opposite case.
REFERENCES:
patent: 5142373 (1992-08-01), Akiyama et al.
patent: 5223869 (1993-06-01), Yhanagi
patent: 5613748 (1997-03-01), Yoshida et al.
Patent Abstracts of Japan vol. 17 No. 153, 25 Mar. 1993 & JP-A-04 320229 (Dainippon Printing Co. Ltd.) 11 Nov. 1992.
Patent Abstracts of Japan vol. 14 No. 8 (-987), 10 Jan. 1990 & JP-A-001 257834 (Asahi Optical Co. Ltd.) 13 Oct. 1989.
Patent Abstracts of Japan, vol. 11 No. 209 (E-521) 7 Jul. 1987 & JP-A-62 030483 (Matsushita) 9 Feb. 1987.
Patent Abstracts of Japan, vol. 8 No. 105 (P-274), 17 May 1984 & JP-A-59 015925 (Mitsubishi) 27 Jan. 1984.
Burgess Glenton B.
Thomson Multimedia S.A.
Tripoli Joseph S.
Wein Frederick A.
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