| 摘要 |
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 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 onto the screen is pre-compensated in response to the projection angle setting signal from the projection angle setting section, so the picture is normally projected onto the screen. When pre-compensating the trapezoidal error of an asymmetrical picture, the performance and the structural flexibility of the hardware in the projector is enhanced by using digital circuits and computer software. Therefore, the conventional construction and/or operation of a projector need not be altered./!
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