A video encoder interframe-encodes a moving image captured by a camera and generates a video code stream. With such diaphragm layer in the display apparatus, the brightness of the display apparatus can be enhanced by the Fresnel diffraction effects of the diaphragm layer. The strong-light detector is induced when the light projected thereto has intensity exceeded a preset value, and causes the strong-light signal circuit to produce a strong-light signal, with which the switching control circuit is immediately enabled to switch headlights of the car from high beams to low beams. The needle guard prevents accidental needle sticks before and after an injection, and locks after dose delivery. These two white-balanced images are then added to form a white balanced image, I, in which the flash and ambient light color agree.