DISPLAY DEVICE HAVING OPTICAL SENSORS

摘要

Disclosed is a liquid-crystal display device 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 in accordance with a predetermined timing. A first portion of the optical sensors detect light when the infrared backlight (32) is turned on, and a second portion of the optical sensors detect light when the infrared backlight (32) is turned off. The first portion of the optical sensors are determined 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) in such a way that black is partially displayed in accordance with the operating optical sensors. Effective regions of the optical sensors included in the display device can therefore be expanded.