Projection type display device

Details Projection type display device Projection type display device

2007-04-10

2007-04-10

Pekey, W. B. (Department: 2851)

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

C348S746000, C348S747000, C345S647000

Reexamination Certificate

active

10922928

ABSTRACT:
A projection type display device includes a distortion corrector for correcting a projected image for distortions when the image is projected with a projection optical axis tilted with respect to a screen. The distortion corrector comprises a tilt angle generator for finding a tilt angle of the projection optical axis, and a display image corrector for correcting the display image using the tilt angle. The display image corrector comprises a two-dimensional table for storing corrected coordinates for four vertexes of the display image employing a vertical tilt angle and a horizontal tilt angle as variables, and a fixed point determiner for selecting one of the four vertexes as a fixed point.

REFERENCES:
patent: 2003/0035590 (2003-02-01), Takeuchi et al.
patent: 2002-284363 (2000-10-01), None
patent: 2002-044571 (2002-02-01), None
patent: 2003-046908 (2003-02-01), None
patent: 2003-57752 (2003-02-01), None
patent: 2003-167296 (2003-06-01), None
patent: 2003-198993 (2003-07-01), None
patent: 2004-32484 (2004-01-01), None
Translation of JP Patent No. 2003-57752.
Japanese Office Action issued Apr. 25, 2006 w/translation of relevant portions.

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