| 摘要 |
A liquid crystal display device is provided with a liquid crystal panel 20 including a plurality of optical sensors, a white backlight 31, and an infrared backlight 32. The infrared backlight 32 is turned on and off with predetermined timings. One part of the optical sensors detect light at the time of turn-on of the infrared backlight 32, and the other part of the optical sensors detect light at the time of turn-off of the infrared backlight 32. One part of the optical sensors is specified as operating optical sensors. A drive circuit of the liquid crystal panel 20 includes a black insertion unit 11, and drives the liquid crystal panel 20 so as to partially perform black display corresponding to the operating optical sensors. This widens an effective region of the optical sensor included in the display device. |
