INPUT DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

The purpose of the present invention is to enhance detection accuracy in an electrostatic capacitance coupling-type input device during a touch operation. Provided is an input device composed of a plurality of drive electrodes and a plurality of detection electrodes that intersect each other, and capacitive elements that are formed at intersections of the drive electrodes and the detection electrodes. During a touch detection period, the input device applies a drive signal to the drive electrodes of each line block of scanning signal lines and performs touch detection according to detection signals output from each detection electrode. The touch detection period is provided in a display update period in a horizontal scanning period of a display device. Further, in the next horizontal scanning period following to a specific horizontal scanning period in which the touch detection was performed, the drive signal applied to the drive electrodes has the potential thereof changed so as to be opposite to the potential during the previous horizontal scanning period, and causes the touch detection to start.