Projection type image display apparatus

Details Projection type image display apparatus Projection type image display apparatus

2005-08-26

2008-03-18

Sever, Andrew T. (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S094000, C348S771000

Reexamination Certificate

active

07344256

ABSTRACT:
A DMD (digital micromirror device) includes a substantially rectangular element face made up of plural mirror elements arranged in a matrix. The DMD is provided with a light shielding cover having a light transmitting portion which corresponds to the element face. Radiated from the illumination optical system including a rod integrator, the illumination light enters the element face, on a flat surface including the diagonal line of the element face, at an inclined angle with respect to the normal to the element face. Near a light exit face of the rod integrator, a mask plate is disposed to regulate a part of the illumination light. The mask plate has a mask aperture of substantially rhombus shape. The illumination light passing the mask aperture is reshaped so that an illumination area can be a substantially rectangular shape on the element face.

REFERENCES:
patent: 6588908 (2003-07-01), Shimizu
patent: 6874894 (2005-04-01), Kitamura
patent: 6886944 (2005-05-01), Dahlgren
patent: 7252395 (2007-08-01), DiCarlo et al.
patent: 2003/0086066 (2003-05-01), Kato
patent: 2003/0202259 (2003-10-01), Nishimae et al.
patent: 8-227034 (1996-09-01), None
patent: 10-253923 (1998-09-01), None
patent: 2002-287081 (2002-10-01), None
“DLP™ technology and its mechanism for projection” from Texas Instruments Japan Limited., searched on Mar. 3, 2003, via the Internet, <URL:http://www.tij.co.jp/jrd/dlp/docs/technology/techsystem.htm>.

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