Patent ID: 9600126
Date: 2017-03-21
CPC Classifications: G02F,G06F

Claim:
1. A location detection device in which a capacitive touch panel is disposed on a surface of a display screen of a display device, the location detection device comprising: the touch panel that includes a plurality of transparent electrodes arranged in mutually intersecting directions, a location detection unit that detects a touch location of an instruction body by selecting parts of the plurality of transparent electrodes and measuring a change in capacitance between the parts, wherein the location detection unit at a point in time inputs a location detection signal to a first part of the electrodes and also captures a signal corresponding to the location detection signal output from a second part of the electrodes, a low impedance setting unit that puts transparent electrodes other than the first part, a third part adjacent to the first part, the second part, and a fourth part adjacent to the second part of the plurality of transparent electrodes into a low impedance state by connecting them to a fixed potential, wherein the third part and the fourth part of the plurality of transparent electrodes are opened, wherein a first set of switches, and a second set of switches are individually connected to each of the plurality of transparent electrodes, and wherein switching between input of the location detection signal or output of the signal corresponding to the location detection signal is performed via the first set of switches, and connection to the low impedance state is performed via the second set of switches.