Liquid crystal display device

Abstract

The liquid crystal display panel of the present invention is formed of a number of pixels that are arranged in a matrix in a display region and a number of light sensor circuits that are provided in the display region, each of the number of light sensor circuits has a light sensor element, the backlight has a first light intensity and a second light intensity that is different from the first light intensity, the first light intensity and the second light intensity are switched between periodically with a predetermined period, the light sensor circuits have a light receiving period during which the amount of light is detected and a readout period during which the amount of light detected during the light receiving period is read out, the light receiving period is an integer multiple of the predetermined period, the light sensor elements have a light sensor operating state with a sensitivity to light and a light sensor non-operating state without sensitivity to light during the light receiving period, and the light sensor operating state and the light sensor non-operating state are switched between periodically with the predetermined period in sync with the switching of the light intensity of the backlight.

Dependencies are inferred from the claim text.