A flat panel display including a display unit, the display unit displaying a first image, an input unit, the input unit being positioned adjacent to the display unit when the display unit is folded toward the input unit, at least one sensor, the sensor detecting luminance information of a second image displayed on the display unit when the display unit is folded toward the input unit, and an optical correction unit, the optical correction unit receiving the luminance information from the sensor and correcting a luminance of the display unit using the luminance information.