The present disclosure provides a display device and a display system. The display device includes a head-up display and a light shielding plate arranged at a light-exiting surface side of the head-up display. The head-up display is configured to display an image, and send information about a shape and a location of the image to the light shielding plate; the light shielding plate is configured to receive the information about the shape and the location of the image, and provide a light transmitting region having a shape and a location identical to those of the image according to the information.