a display panel comprising a first display region, and a second display region;

a camera module under the display panel and overlapping the second display region, and configured to output an image signal; and

a compensator configured to generate a compensated image signal by compensating the image signal by a compensation algorithm, wherein the compensation algorithm is trained with training data comprising a first comparison image and a second comparison image,

wherein each of the first comparison image and the second comparison image is a composite image,

wherein based on a same area, a number of pixels arranged in the first display region is greater than a number of pixels arranged in the second display region,

wherein the first comparison image is the composite image synthesized based on a first processed image, for restoration,

wherein the second comparison image is generated by compositing a second processed image formed based on light that does not pass through the display panel with a third processed image, and

wherein each of the first processed image and the second processed image is obtained by processing a first image.