It is decided whether to adjust data associated with a decoder. Preferred costimulatory molecules are B7-2 and B7-3. The mode stitching unit is configured to switch, depending on conditions, between a state where an image output unit outputs an image signal generated in the intermediate mode and a state where the image output unit outputs an image signal generated in the night-vision mode. The multiple layers include a protective layer disposed on the cathode layer. The molding time is also reduced because of the reduced amount of polyurethane binder used.