A display device comprising: a first pixel area comprising first pixels; a second pixel area comprising second pixels; a third pixel area comprising third pixels; and a display driver configured to control image display operations of the first pixel area, the second pixel area, and the third pixel area by displaying a valid image via the second pixel area in a first mode, and displaying a valid image via the first pixel area, the second pixel area, and the third pixel area in a second mode, wherein the second pixel area is situated between the first and third pixel areas, wherein the first pixel area comprises a first sub-pixel area, and a second sub-pixel area between the first sub-pixel area and the second pixel area, and the second sub-pixel area being adjacent to the first sub-pixel area and the second sub-pixel area being adjacent to the second pixel area, wherein the first sub-pixel area is configured to display a black image in the first mode, and the second sub-pixel area is configured to display a dummy image in the first mode, wherein the dummy image is a set or predetermined image and the valid image is an image other than the dummy image, wherein the first pixel area, the second pixel area, and the third pixel area are divided into a visible area and a non-visible area in the first mode, the visible area being an area of high visibility for a user and the non-visible area being an area of low visibility for the user, wherein the first pixel area and the third pixel area correspond to the non-visible area, and wherein the second sub-pixel area includes a first pixel group, and in the first mode, the first pixel group is configured to perform a light-emitting operation in a first period and perform a non-light-emitting operation in a second period, wherein the first period and the second period are repeatedly generated. a first pixel area comprising first pixels; a second pixel area comprising second pixels; a third pixel area comprising third pixels; and a display driver configured to control image display operations of the first pixel area, the second pixel area, and the third pixel area by displaying a valid image via the second pixel area in a first mode, and displaying a valid image via the first pixel area, the second pixel area, and the third pixel area in a second mode, wherein the second pixel area is situated between the first and third pixel areas, wherein the first pixel area comprises a first sub-pixel area, and a second sub-pixel area between the first sub-pixel area and the second pixel area, and the second sub-pixel area being adjacent to the first sub-pixel area and the second sub-pixel area being adjacent to the second pixel area, wherein the first sub-pixel area is configured to display a black image in the first mode, and the second sub-pixel area is configured to display a dummy image in the first mode, wherein the dummy image is a set or predetermined image and the valid image is an image other than the dummy image, wherein the first pixel area, the second pixel area, and the third pixel area are divided into a visible area and a non-visible area in the first mode, the visible area being an area of high visibility for a user and the non-visible area being an area of low visibility for the user, wherein the first pixel area and the third pixel area correspond to the non-visible area, and wherein the second sub-pixel area includes a first pixel group, and in the first mode, the first pixel group is configured to perform a light-emitting operation in a first period and perform a non-light-emitting operation in a second period, wherein the first period and the second period are repeatedly generated.