1. A display device, comprising:a display panel;
a driver configured to drive the display panel based on a video signal; and
a detector configured to obtain a first detection value by detecting reflective light from a reflective media, which occurs when ambient light is irradiated to the reflective media, while obtaining a second detection value by detecting reflective light from the reflective media, which occurs when the display panel irradiates display light to the reflective media.