Patent ID: 8451234
Filing Date: 2013-05-28
Classification: G02F,G06F

Abstract:
1. A display device with touch panel comprising: a display panel; and an electrostatic capacitance coupling type touch panel arranged on a surface on an observer side of the display panel, the touch panel including: plural first electrodes extending in a first direction; plural second electrodes extending in a second direction different from the first direction; a driving circuit; a detection circuit; and a coordinate-position calculating circuit that calculates a touch position on the touch panel touched by the observer, wherein the driving circuit sequentially selects two first electrodes out of the plural first electrodes, supplies a high potential voltage higher than a reference voltage to a first selected first electrode of the selected two first electrodes, and supplies the reference voltage to a second selected first electrode of the selected two first electrodes, the detection circuit selects at least one second electrode out of the plural second electrodes and detects a capacitance difference (A−B) between a capacitor A between a first selected second electrode of the at least one second electrode and the first selected first electrode to which the high potential voltage is supplied and a capacitor B between the first selected second electrode and the second selected first electrode to which the reference voltage is supplied, and the coordinate-position calculating circuit calculates a touch position on the touch panel touched by the observer based on positions of the selected two first electrodes and the first selected second electrode and the capacitance difference (A−B).