Method and apparatus for pre-compensating an asymmetrical pictur

Details Method and apparatus for pre-compensating an asymmetrical pictur Method and apparatus for pre-compensating an asymmetrical pictur

1996-07-24

1997-09-09

Dowling, William

Optics: image projectors

Distortion compensation

353 70, G03B 2114

Patent

active

056648588

ABSTRACT:
An apparatus and a method in a projector in which in order to project a clear picture onto a screen without the occurrence of the keystoning, an asymmetrical picture is pre-compensated is disclosed. In the apparatus and method for pre-compensating an asymmetrical picture in a projector, when the projection lens of the projector is arranged at an upward or a downward projection angle, regardless of the projection angle, a trapezoidal error of the picture projected on the screen is pre-compensated in response to the projection angle setting signal from the projection angle setting section, so that the picture is normally projected onto the screen (e.g., a picture in the shape of a rectangle). Consequently, the performance or structural flexibility of the projector is enhanced by using digital circuits and softwares therefor.

REFERENCES:
patent: 4422153 (1983-12-01), Arai et al.
patent: 5283602 (1994-02-01), Kwon
patent: 5355188 (1994-10-01), Biles et al.
patent: 5414480 (1995-05-01), Morizumi
patent: 5455647 (1995-10-01), Fujiwara

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