An adhesive composition to be used for production of a display unit integrally combined with an optically functional member by bonding together the display unit and the optically functional member, wherein the adhesive composition is characterized by being incorporated with a compound having one or more hydroxyl groups. The DSM is configured to perform delta-sigma modulation on an analog signal from a unit pixel. If ice has not formed to the predetermined thickness, the ice safety device indicates an unsafe condition. A second setting means sets the imaging means to image a second range, which is a part of the imaging range imaged by the imaging means and is narrower than the first range, with a second frame rate higher than the first frame rate. An output current offset circuit offsets a current corresponding to the output current of one of the differential pairs based on the complementary input signal so that the output voltage becomes the output current of one of the first and second differential pairs.