Abstract: An image display device includes: a display device configured to display an image; a liquid crystal element on which light emitted from the display device is incident, the liquid crystal element being configured to selectively allow one of P-polarized light or S-polarized light to exit the liquid crystal element; a reflective polarizing member configured to reflect the one of the P-polarized light or the S-polarized light that has exited the liquid crystal element and to transmit the other of the P-polarized light or the S-polarized light; and a reflecting member configured to reflect the other of the P-polarized light or the S-polarized light in the same direction as a travel direction of the one of the P-polarized light or the S-polarized light reflected by the reflective polarizing member

Abstract: The present disclosure stabilizes power generation of a fuel cell stack in an environment in which an oxygen concentration in a fuel cell system readily decreases. In a case where it is detected that the oxygen concentration is lower than a predetermined concentration or where a phenomenon caused by the oxygen concentration being lower than the predetermined concentration is detected, processing to increase a flow rate of air supplied to the fuel cell stack or processing to ventilate the interior of the fuel cell stack by controlling an operation of a ventilation unit is performed.