Rear projection display device

Details Rear projection display device Rear projection display device

2011-04-19

2011-04-19

Lee, John R (Department: 2878)

Optics: image projectors

Composite projected image

Reflector between lamp and screen

C353S051000, C353S078000

Reexamination Certificate

active

07926952

ABSTRACT:
A rear projection display device (1) includes a screen (10), a projection engine (11) for producing an image light beam, a projection lens (12), and reflectors (13, 14) for projecting the image light beam onto the screen. The projection engine and the projection lens are positioned in rear of the screen within a substantially central portion of the display device. The reflectors are composed of two symmetrically arranged groups of first and second reflectors. The first and second reflectors in each group form a certain angle with each other. The first reflectors divide the image light beam from the projection lens into two image sub-beams, and then reflect them onto the respective second reflectors. The second reflectors reflect the two image sub-beams onto the screen for display a combined single image. By means of the image light beam division and two times of reflection by the reflectors, the depth of the display device is significantly reduced. The height of the display device is also significantly reduced as the projection engine is positioned in rear of the screen. When viewed from a front side of the display device, substantially only the screen can be seen.

REFERENCES:
patent: 6839042 (2005-01-01), Conemac et al.
patent: 7090353 (2006-08-01), Bay
patent: 7530694 (2009-05-01), Lowe
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patent: 2008/0055559 (2008-03-01), Wan
patent: 2008/0151199 (2008-06-01), Wu et al.
patent: 2009/0141191 (2009-06-01), Nojima et al.

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