Patent ID: 8094104

Claim:
A liquid crystal drive device, comprising: a differential type input circuit including a differential amplification stage for receiving a differential signal and an output stage for generating an output signal on the basis of an output of the differential amplification stage, receives display data via the input circuit and outputs a signal for driving a liquid crystal on the basis of the display data; two clock input circuits for receiving differential external clocks; and a first latch for latching one of said two input signals serially input per external clock and a second latch for latching the other signal, wherein a positive-phase signal of an external clock is input to a positive-phase input terminal and a negative-phase signal is input to a negative-phase input terminal in one of the clock input circuits, wherein a negative-phase signal of an external clock is input to a positive-phase input terminal and a positive-phase signal is input to a negative-phase input terminal in the other clock input circuit, wherein two input signals are serially input per external clock to said input circuit, wherein timings of receiving the two input signals are given on the basis of two clock signals input via said two clock input circuits, respectively, wherein latch timings of the first and second latches are provided on the basis of two clock signals input via said two clock input circuits, and wherein said differential amplification stage has standby means for interrupting an operation current flowing in the differential amplification stage.