Projection apparatus and projection-type image display...

Details Projection apparatus and projection-type image display... Projection apparatus and projection-type image display...

2005-06-14

2005-06-14

Nguyen, Judy (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S070000, C353S074000, C353S085000, C348S745000, C348S806000

Reexamination Certificate

active

06905213

ABSTRACT:
In an illumination optical system and a color combining optical system of a projection apparatus using three image display elements, the object of the present invention is to reduce misconvergence of enlarged images displayed on a screen. The present invention provides a projection apparatus including light-detecting elements provided outside of an effective screen display area. An active region of image display elements for each color beam is controlled respectively based on results of the light-detecting elements in order to adjust display position of each color beam on the screen.

REFERENCES:
patent: 6460999 (2002-10-01), Suzuki
patent: 6499849 (2002-12-01), Huang
patent: 2003/0123031 (2003-07-01), Nelson et al.

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