As should be clear from the explanation supra, since fine time allocation is required in order to carry out high gradation display, a very high-speed switching is essential for the circuit of such as active device (TFT), shift register, LCD driver, and of FIFO. In order to achieve 256 gradations, for example, 30 or more of moving pictures should be fed per second, thus 256T1<300 msec, so that T<10