| 摘要 |
An automatic contrast control circuit for a display device includes a distance detector installed on a front panel of the display device, for detecting a distance existing between a user and the front panel and generating a distance signal representative of the detected distance; and a micro-computer for outputting a contrast gain control signal based on the distance signal output from the distance detector, and outputting on screen display (OSD) data indicative the contrast gain signal. A display control panel is provided on the display device to permit user input of an automatic contrast control (ACL) function and an OSD function. The distance detector includes a light emitting unit for emitting light from the display device, and a light receiving unit for receiving the light reflected from the user to detect the distance between the user and the front panel of the display device. Thus, The contrast of the display device is controlled automatically, depending on the proximity of the user to the display screen, to offer enhanced eye protection.
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