Display device and method of driving the same

A display device, comprising:

• a housing;
• a display touch module including a non-exposed area covered by the housing, an exposed area located outside the housing, and an active area disposed over the non-exposed area and the exposed area, the display touch module including a display member configured to display a screen and a touch member on the display member and configured to sense a touch input, the touch member comprising a driving line and a sensing line;
• and
• a boundary determining member configured to sense a capacitance of the touch member and calculate coordinates of an exposure boundary between the exposed area and non-exposed area of the display touch module based on the capacitance of the touch member in the exposed area including only a mutual capacitance between the driving line and the sensing line, and the capacitance of the touch member in the non-exposed area including the mutual capacitance and a self-capacitance between the driving line, the sensing line, and the housing,
• wherein the display device is configured to adjust a display range of the active area according to the coordinates of the exposure boundary calculated by the boundary determining member.