| abstract |
It is an object of the present invention to provide a display device with low power consumption and good display quality. The first substrate has a terminal portion, a pixel electrode, a switching transistor including an oxide semiconductor, a first optical sensor having high optical sensitivity of visible light, and an optical sensitivity having infrared light and having the first optical sensor A second optical sensor with low optical sensitivity of visible light. The illuminance or color temperature of the display device is detected using the first and second optical sensors, and the brightness or hue of the displayed image is adjusted. A second substrate is provided to face the first substrate and has opposite electrodes. During the display of the still image, the switch transistor is turned off, so that the opposite electrode is in a floating state. |