Liquid crystal display device with touch panel

A liquid crystal display device with a touch panel comprising:

• pixel electrodes that are a plurality of electrodes which are disposed in each pixel disposed in a display region and to which a potential is applied depending on a gradation value;
• common electrodes that are a plurality of electrodes which extend in one direction across the display region;
• detection electrodes that are a plurality of electrodes which extend in a direction different from the one direction across the display region, form an electric capacitance with driving electrodes that are a part of the common electrodes, and detect a contact position on a panel;
• a liquid crystal layer that is formed by a liquid crystal composition in which an orientation is changed by an electric field formed by the pixel electrodes and the common electrodes;
• and
• a driving pulse output section that applies a driving pulse once to the driving electrodes for detecting contact within two successive horizontal synchronizing periods that are periods of display.