Patent ID: 7075521

Claim:
An input-output integrated type display device comprising: a liquid crystal display panel having pixel electrodes arranged in a matrix form, switching elements that are arranged in a matrix form and connected to the pixel electrodes, a plurality of scanning lines commonly connected to a control terminal of each of the switching elements arranged in the direction of row, a first insulating substrate on which a plurality of reference wiring lines commonly connected to the pixel electrodes arranged in the direction of row via the switching elements are formed, a second insulating substrate on which a plurality of stripe-shaped signal wiring lines commonly opposite to the pixel electrodes arranged in the direction of column are formed, and a liquid crystal layer held between the first insulating substrate and the second insulating substrate; a display control means for turning on the switching elements in rows with a scanning signal inputted to the plurality of scanning lines in a display period so as to connect the pixel electrodes to the reference wiring lines and inputting a voltage to the plurality of signal wiring lines according to display data so as to apply a display voltage corresponding to the display data across the pixel electrodes connected to the reference wiring lines and the signal wiring lines; a position information control means for simultaneously inputting the position information signal that represents a position on the liquid crystal display panel to the plurality of signal wiring lines in a non-display period; a position information signal detection means for detecting the position information signal inputted to the signal wiring line located in the vicinity of its tip portion; and a position detection means for detecting a tip position of the position information signal detection means on the liquid crystal display panel on the basis of the position information signal detected by the position information signal detection means.