1. A transparent display device, comprising: a display panel comprising a plurality of pixels configured to display a compensated image to a viewer facing a first side of the display panel, wherein at least part of a background facing a second side of the display panel is visible to the viewer through the display panel at least when no image is being displayed by the display panel; means for compensating an image being displayed on the display panel in order to remove distortion of the image due to interference by the background visible through the display panel in a region of the display panel where light from the background overlaps the image in order to provide an originally intended image, the means for compensating the image comprising: a position sensor provided toward the first side of the display panel for determining the viewer's position including a variable distance from the viewer to the display panel; and means for determining, based on the sensed position of the viewer, which part of the background corresponds to the at least part of the background visible to the viewer through the display panel, the means for compensating the image being configured to: determine a distortion level of the image according to an external light and the light from the background corresponding to the variable distance from the viewer to the display panel, including determining a property of the background, wherein the determined property of the background is a determined property of the at least part of the background visible to the viewer through the display panel, and wherein the determined property includes color, and process original image data to compensate for the distortion level of the image, thereby producing compensated image data; and means for generating a display by the display panel of the compensated image, the compensated image being based on the compensated image data.