Patent ID: 7855779

Claim:
A display device comprising: a plurality of display pixels that displays an image on a display screen; a first optical sensor that is provided so as to correspond to either each one of the plurality of display pixels or each set of more than one pixel, the first optical sensor detecting the amount of incident light; a second optical sensor that is provided so as to correspond to either each one of the plurality of display pixels or each set of more than one pixel, the second optical sensor detecting the amount of incident light; an optical member that allows light coming from a first direction to enter the first optical sensors and allows light coming from a second direction to enter the second optical sensors, the second direction being different from the first direction; a memory circuit that stores a first detection result that is detected in a first time period by means of the first optical sensors and stores a second detection result that is detected in the first time period by means of the second optical sensors; a comparison circuit that compares, after the detection of a third detection result in a second time period that is subsequent to the first time period by means of the first optical sensors and the detection of a fourth detection result in the second time period by means of the second optical sensors, the third detection result with the first detection result and further compares the fourth detection result with the second detection result; and a judgment circuit that makes a judgment as to whether the display screen has been touched with a detection target medium or not on the basis of the result of comparison performed by the comparison circuit.