Patent ID: 8274481
Filing Date: 2012-09-25
Classification: G06F

Abstract:
1. A touch-sensored display device comprising: a display panel including: an active matrix substrate having a plurality of pixel electrodes, a display medium layer, and a counter substrate disposed on a viewer side of the active matrix substrate via the display medium layer, the counter substrate having a counter electrode which opposes the plurality of pixel electrodes; a display panel driving circuit for supplying display signal voltages to the plurality of pixel electrodes, and supplying to the counter electrode a common voltage which undergoes periodic inversion in polarity; a transparent conductive film for position detection, placed so as to oppose the counter electrode via the counter substrate; a plurality of terminals connected to different points on the transparent conductive film for position detection; an AC voltage generation circuit for supplying an AC voltage for position detection to the plurality of terminals; and a position data generation circuit including: a strobe signal generation circuit for generating a strobe signal which is in synchronization with a polarity inversion period of the common voltage, and a plurality of noise-cut current signal generation circuits each being connected to one of the plurality of terminals and generating a noise-cut current signal which is obtained by eliminating a noise ascribable to an induced voltage that occurs on the transparent conductive film responsive to the common voltage from a current flowing from one of the plurality of terminals by using the strobe signal, wherein the induced voltage is induced on the transparent conductive film for position detection, the position data generation circuit generating position data of a contact point which is formed directly or indirectly on the transparent conductive film for position detection, the position data being generated based on the noise-cut current signal.