Patent ID: 8866779

Claim:
A display device comprising: a display panel; and a touch panel built in the display panel, wherein the touch panel includes: a plurality of scanning electrodes formed on the display panel; a plurality of detection electrodes formed on the display panel and crossing the plurality of scanning electrodes; a driving-signal supplying unit configured to input a driving signal to the scanning electrodes when a touch position detection is performed; a detecting unit configured to acquire detection signals from the detection electrodes when the driving signal is input to the scanning electrodes from the driving-signal supplying unit; and a sensitivity correcting unit configured to correct sensitivity of the touch panel, and the sensitivity correcting unit includes: a difference acquiring unit configured to acquire a signal difference (S1−S2) between a detection signal S1 acquired by the detection electrodes when a driving signal V1 is input to the scanning electrodes from the driving-signal supplying unit and a detection signal S2 (S1>S2) acquired by the detection electrodes when a driving signal V2 (V1>V2) different from the driving signal V1 is input to the scanning electrodes from the driving-signal supplying unit; and a parameter changing unit configured to change parameters of at least one of the driving-signal supplying unit and the detecting unit when the signal difference (S1−S2) is equal to or smaller than a predetermined threshold D.