a display system for a computer includes an image projector located in the computer and oriented to project a computer - generated image from the computer . alternatively , the display system includes a screen and an image projector attached to the screen , where the screen is capable of receiving a computer - generated image projected by the image projector . alternatively , the display system includes an image projector and a screen that is attached to the computer and that is capable of displaying an image projected by the image projector .