Transparent display device

A transparent display device, has a display panel 100 formed with pixels for displaying an image, through which a background at a rear side thereof passes. One or more driving units 110, 120 connected to the display panel drive the pixels. A timing controller 130 is configured to control the driving unit; and an image compensation unit 140 is configured to determine a distortion level for the color coordinates of the image according to external light and the background to compensate and output an image signal to the timing controller. The device compensates for external environmental effects such as color background overlapping, interference due to external light, and the like, which have an effect on an image, to provide an original image with a minimized distortion to a viewer. One or more sensors 141, 142 may be provided on a front surface and a rear surface of the transparent display device to detect the viewer's line of sight and background, and to compensate for a distortion of the image based on color coordinates estimated according to the detection results.