DISPLAY DEVICE CAPABLE OF OPTICAL POINTING INPUT

摘要

The present invention relates to a display device capable of optical pointing input, the display device comprising a screen unit in which unit recognition elements constituted by optical sensors are arranged according to a predetermined arrangement rule, each optical sensor including a thin film transistor and a light-receiving diode connected to a signal output part of the thin film transistor; and a driving/recognition unit for recognizing the point at which light is input using a change in the output voltage characteristics of the thin film transistor, caused by a change in the value of electric resistance of the light-receiving diode when light is input to the screen unit from an external source. When the light input to the screen unit causes a change in the output voltage characteristics of three or more unit recognition elements, the driving/recognition unit detects the three unit recognition elements which output the largest change in the voltage characteristics, and recognizes the point at which the light is input, using the arrangement rule of the unit recognition elements and a triangulation method.