DISPLAY DEVICE INCLUDING OPTICAL SENSOR AND DRIVING METHOD THEREOF

摘要

An object is to provide a display device with low power consumption and good display quality. A first substrate is provided with a terminal portion, a pixel electrode, a switching transistor including an oxide semiconductor, a first optical sensor having high optical sensitivity to visible light, and a second optical sensor having optical sensitivity to infrared light and having lower optical sensitivity to visible light than the first optical sensor. The illuminance or color temperature around a display device is detected using the first and second optical sensors, and the luminance or color tone of a display image is adjusted. A second substrate is provided so as to face the first substrate, and is provided with a counter electrode. In a period for displaying a still image, the switching transistor is turned off so that the counter electrode is brought into a floating state.

主权项

1. A method for driving a display device comprising a first substrate provided with a terminal portion, a pixel electrode, a switching transistor including, a first optical sensor, and a second optical sensor, and a second substrate provided with a counter electrode, the method comprising the steps of:
detecting an illuminance around the display device by using the first optical sensor and the second optical sensor; and adjusting a luminance of a display image in accordance with the illuminance, wherein the switching transistor comprises an oxide semiconductor, wherein the first optical sensor has maximum sensitivity at a wavelength of approximately 0.6 μm, and detects visible light, wherein the second optical sensor has maximum sensitivity at a wavelength of approximately 0.7 μm, and detects visible light and infrared light, wherein the second optical sensor has lower optical sensitivity to visible light than the first optical sensor, and wherein a potential is supplied from the terminal portion to the counter electrode through the switching transistor.