A display device receiving image data generated by an image generator and including a first memory, a second memory, a selection circuit, a timing controller, and a display panel is provided. The first memory is configured to store first display data. The second memory is configured to store second display data. The second memory is disposed independent of the first memory. The selection circuit selects either the first display data or the second display data to serve as specific data based on a first selection signal. The timing controller generates the first selection signal according to the voltage level of a specific pin and provides the specific data to the image generator. The image generator generates the image data according to the specific data. The display panel displays an image based on the image data.