Projection-type display apparatus

Details Projection-type display apparatus Projection-type display apparatus

2006-08-15

2006-08-15

Tran, Trang U. (Department: 2622)

Television

Video display

Projection device

C348S746000, C348S806000, C353S070000

Reexamination Certificate

active

07092045

ABSTRACT:
In measuring the angle of inclination of a liquid crystal projector with respect to the screen for automatically adjusting a trapezoidal distortion, the calculation of the angle of inclination by determining the distance from the screen using a distance sensor conventionally requires a high distance measurement accuracy and hence an expensive distance sensor. According to the invention, a distance sensor is rotated and the level of the wave reflected from it is observed. The angle of inclination with respect to the screen is detected from the rotational angle associated with the maximum value of the level of the reflected wave thereby to correct the trapezoidal distortion. In this way, the trapezoidal distortion can be adjusted automatically using an inexpensive distance sensor.

REFERENCES:
patent: 5793340 (1998-08-01), Morita et al.
patent: 6361171 (2002-03-01), Ejiri et al.
patent: 6481855 (2002-11-01), Oehler
patent: 6652104 (2003-11-01), Nishida et al.
patent: 6686973 (2004-02-01), Su
patent: 6847356 (2005-01-01), Hasegawa et al.
patent: 02835838 (1998-10-01), None
patent: 2000-122617 (2000-04-01), None
patent: 2001-109577 (2001-04-01), None

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