A touch screen display device includes a display panel, a touch screen panel disposed on the display panel, and configured to include a plurality of first electrodes, which are parallelly arranged in a first direction, and a plurality of second electrodes which are parallelly arranged in a second direction, a switching unit configured to apply a first touch scan pulse to the plurality of first electrodes during a first period, and apply a second touch scan pulse to the plurality of first and second electrodes during a second period, a first touch sensing unit configured to apply the first touch scan pulse to the switching unit, and a second touch sensing unit configured to apply the second touch scan pulse to the switching unit.