| 摘要 |
The circuit for adjusting the data signal for controlling contrast by varying the voltage of the data to be displayed comprises a LCD control circuit (10), a LCD driving circuit (20) for transmitting the parallel data for display pattern and the LCD driving signal, a shift registor (40) for converting the parallel data to the serial data by shifting, a varying circuit (50) for varying the voltage level of the data signal with the contrast control signal and a shift registor (60) for converting the varied serial data to the parallel data and for transmitting them to the LCD screen.
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