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以前,夏普47cm和51cm彩电曾采用过亮度自动控制电路。该类机型面板右上方装有一只光敏传感器,可以对电视机周围环境光强度进行检测,当光强度发生变化时,经放大电路转换为直流控制电压,进入亮度控制电路,可以自动调整屏幕亮度。由于当时采用I_2C总线控制的机型极少(只有少数欧洲机型采用),画面亮度和对比度等均由手动或者键控CPU模拟量控
In the past, Sharp 47cm and 51cm color TV had adopted the brightness of automatic control circuit. The model is equipped with a photosensor on the upper right of the panel, which can detect the ambient light intensity of the TV. When the light intensity changes, it is converted into the DC control voltage by the amplifying circuit and enters the brightness control circuit, which can automatically adjust the screen brightness . As I_2C bus control with very few models (only a few European models used), screen brightness and contrast by manual or keyed CPU analog control