Patent ID: 9639191
Date: 2017-05-02
CPC Classifications: G02F,G06F

Claim:
1. A display device with a touch sensor, comprising: a plurality of display pixel electrodes; a common electrode configured to be provided opposed to the display pixel electrodes; a display function layer configured to have an image display function; a display control circuit configured to apply a display voltage between the display pixel electrodes and the common electrode based on an image signal and carry out image display control so that the display function of the display function layer be exerted; and a touch detection electrode configured to be provided opposed to the common electrode and form capacitance between the touch detection electrode and the common electrode, wherein a display drive voltage having a fixed voltage amplitude, applied to the common electrode by the display control circuit is utilized as a touch sensor drive signal, wherein a predetermined voltage is applied through a gate buffer to a gate of a thin-film transistor circuit connected to the display pixel electrode, wherein during application of the touch sensor drive signal, a potential of the gate is set to a floating state in which the gate and the gate buffer are in an electrically open state, wherein the gate buffer includes a switch that is configured to set the potential of the gate in the floating state, wherein the gate is set to an ON state when a first gate voltage is applied to the gate through the gate buffer, wherein the gate is set to an OFF state when a second gate voltage is applied to the gate through the gate buffer, during the application of the touch sensor drive signal the gate is set to the floating state, when the switch is opened and the gate is electrically disconnected from the gate buffer, wherein the switch is arranged between the gate buffer and a second wiring which supplies the second voltage to the gate buffer, and wherein the gate buffer is connected to a first wiring which supplies the first voltage to the gate buffer.