Optics: image projectors – Distortion compensation
Reexamination Certificate
2006-04-18
2006-04-18
Dowling, William C. (Department: 2851)
Optics: image projectors
Distortion compensation
Reexamination Certificate
active
07029125
ABSTRACT:
A projecting device with a keystone correction function includes an adjustable part, a signal generator, a correction circuit and a micro-processing control unit. The adjustable part is coupled to a supporting foot of the projecting device, and an electric property thereof changes along with a different height of the supporting foot. When an angle of the projecting device is adjusted, the signal generator generates and outputs a corresponding adjusting signal serving as a basis for the keystone correction according to the electric property of the adjustable part. In practice, the adjustable part may be achieved by utilizing a rheostat, and the signal generator may be achieved by utilizing a biasing circuit and a converter. When an angle is adjusted, a resistance of the rheostat is also adjusted simultaneously so that the biasing circuit outputs different voltages to generate the adjusting signal.
REFERENCES:
patent: 5641957 (1997-06-01), Chae
patent: 5717935 (1998-02-01), Zanders et al.
patent: 5720539 (1998-02-01), Woo
patent: 6481855 (2002-11-01), Oehler
patent: 6877864 (2005-04-01), Tamura et al.
patent: 2004/0041985 (2004-03-01), Kimura et al.
Benq Corporation
Dowling William C.
Thomas Kayden Horstemeyer & Risley
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