| 摘要 |
In a still image display mode, a driving signal and power supply voltage are supplied to a first driver circuit and a driving signal and power supply voltage are supplied to a second driver circuit, and an image signal is output to n pixels. After that, at least the supply of the driving signal and the power supply voltage to the second driver circuit is stopped and an image of the pixel portion based on the image signal is held as a still image. A series of these operations is performed N (N is a natural number) times. In the case where N is 2 or more, stopping the supply of the driving signal and the power supply voltage to the second driver circuit in a K-th (K is a natural number, 2≰K≰N) period is set longer than that in a (K−1)-th period.
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