<p>A display device including a remote control unit and a display panel unit is provided. The display panel unit includes a plurality of optical receivers and a track recognizer. The remote control unit emits a light beam. The optical receivers receive the light beam and convert the light beam into a plurality of sensing voltages. The track recognizer generates a control command according to the sensing voltages so that the display panel unit sets an on-screen display (OSD).</p>
