| 摘要 |
PROBLEM TO BE SOLVED: To suppress the power consumption of a portable information device.SOLUTION: A portable information device includes a display device, a CPU, and an external input terminal, in which the display device includes a source signal line drive circuit and a plurality of pixels, and the plurality of pixels each include a circuit having a function of storing video signals input to the pixel and a pixel electrode. And, if the input of signals for changing a video display is not performed by the external input terminal for a certain period, the CPU determines that the display device displays a still picture, and when the display device displays the still picture, the supply of a start pulse, a clock signal, and a video data signal is stopped from the CPU to the source signal line drive circuit. |
