A display device is disclosed. A display panel displays a first image according to a first output image. A timing controller includes a receiving unit, a compression unit, a decompression unit and a processing unit. The receiving unit receives a first input image and a second input image and outputs a first processed image and a second processed image. The first input image is the same as the first processed image. The second input image is the same as the second processed image. The compression unit generates a first compressed image according to the first processed image. The receiving unit stores the first compressed image. The decompression unit processes the stored first compressed image to generate a first decompressed image. The processing unit processes the second processed image and the first decompressed image to generate the first output image.