| 摘要 |
The screen size of a TV is automatically adjusted according to distance between a viewer and a TV. The circuit comprises a distance detector(11) for detecting distance of a viewer, a microprocessor(12) for generating screen size control signals according to output signal of the distance detector(11), a level controller(13) for changing DC voltage level applied to a vertical deflector, and a DC voltage adjuster(15) for changing DC voltage level applied to a horizontal deflector. |
