An image projecting apparatus projects an image formed on a display device in accordance with input image data, onto a projection surface with illumination light emitted from a light source, to enable an observer to observe the image. Display pixels and sensor pixels of an EL display each have an EL element, and the sensor pixels each have a diode. Additionally, embodiments of present invention can include circuitry within the lens board that can be used to identify the types of lenses currently installed within each camera lens receiver.