Display apparatus

A display apparatus includes a display panel to display a picture thereon, a front cover and a rear cover to support the display panel, a pen unit movable on the display panel and including a light generator to emit light and a supersonic wave generator to emit a supersonic wave, a light sensor provided at the front cover to detect the light emitted from the light generator, a first supersonic wave sensor provided at the front cover to detect the supersonic wave emitted from the supersonic wave generator, and disposed adjacent to the light sensor to measure a distance from the pen unit using a time difference between when the light sensor detects the light and when the first supersonic wave generator detects the supersonic wave, a second supersonic wave sensor provided at the front cover to detect the supersonic wave emitted from the supersonic wave generator, and spaced apart from the first supersonic wave sensor to measure a relative distance from the pen unit using a time difference between when the first supersonic wave sensor and the second wave sensor detect the supersonic wave, and a controller to receive a detecting signal from each of the first supersonic wave sensor, the second supersonic wave sensor, and the light sensor, and to detect position information of the pen unit based on the received detecting signals. Accordingly, the display apparatus performs a tablet function and reduces production costs by using a simple display panel.