Patent ID: 8928620
Filing Date: 2015-01-06
Classification: G06F

Abstract:
1. A flat-panel display device comprising: a display device substrate formed to have scanning and signal electrodes for applying electrical signals to an electro-optically responsive display element and pixel electrodes; a display area formed by an array of the pixel electrodes; an impedance surface corresponding to a display area of said flat-panel display device; and a current detecting circuit that detects currents that flow through the impedance surface; a detector that detects whether a touch occurs and coordinates of the touch based on the currents detected by said current detecting circuit; wherein, while said current detecting circuit detects the currents, at least one of said scanning and signal electrodes for applying electrical signals, which extends from an exterior to an interior of the display area for transmitting an electrical signal from the exterior to the interior of the display area, from among the scanning and signal electrodes that apply the electrical signals to the display element, is placed directly at a high impedance against all voltage sources so as to enable to decrease the currents flowing through the impedance surface and low impedance scanning and signal electrodes other than the at least one of the scanning and signal electrodes placed at high impedance.