SEMICONDUCTOR INTEGRATED CIRCUIT, LIQUID CRYSTAL DRIVE DEVICE, AND LIQUID CRYSTAL DISPLAY SYSTEM

摘要

A liquid crystal drive device comprises a differential input circuit provided with a differential amplifying stage (1) for receiving differential signals (YN, YP) and an output stage (2, 3) provided with a drive stage and a buffer stage and adapted for generating an output signal (OUT) in response to the output of the differential signals (YN, YP). The liquid crystal drive device receives display data signals as differential signals through the input circuit and outputs a signal for driving the liquid crystal according to the display data. A liquid crystal drive voltage (VDD2) higher than the power supply voltage (VCC) for logic supplied to the output stage (2, 3) is supplied to the differential amplifying stage (1) of the input circuit. The liquid crystal drive device has a standby function of cutting off the operating current of the differential amplifying stage (1) during the time when no display data is inputted.