Abstract: A video projector including light source lamps and a cooling fan, which cools the light source lamps. A memory unit stores a reference time set for each of the light source lamps. The reference time indicates the time required for the corresponding light source lamp to be cooled, after being deactivated, to the reference temperature or less. A notification unit generates a notification for each of the light source lamps indicating that the light source lamp is replaceable. An elapsed time from when each of the light source lamps is switched from an activated state to a deactivated state is compared with a corresponding reference time. When the elapsed time exceeds the corresponding reference time, the notification unit generates the notification related to the corresponding light source lamp.

Abstract: A lamp operation device includes a mode setting part that sets an operation mode for lamps, and a lamp operation part that controls switching between the lamps in accordance with the set operation mode. The lamp operation part includes a process corresponding to a manual switching mode in which a lamp selected by a user is set as an illumination lamp, and a process corresponding to an automatic switching mode in which the plurality of lamps is automatically set in sequence as an illumination lamp. In the automatic switching mode, after one lamp has been set as the illumination lamp, cumulative illuminating time (amount of change) of the lamp is measured. Then, the illumination lamp is switched to the other lamp, depending on whether a measurement result has exceeded predetermined threshold time.

Abstract: A video projector including a plurality of light sources used to display an image and a control unit that switches each of the light sources between states of activation and deactivation. The control unit is capable of setting an activation period for each activation of at least one of the light sources.

Abstract: An image display apparatus includes a control unit for controlling a manner of supplying electric power from a power supply unit to an illumination device, and a detection unit included in a control system independent of the control unit. The detection unit detects whether or not a component of the image display apparatus assumes a state satisfying a condition on which electric power is supplied to the illumination device. When the control unit outputs a signal to the power supply unit for causing the power supply unit to supply electric power to the illumination device, and the detection unit detects that the component assumes the state satisfying the condition, supply of electric power to the illumination device is permitted.

Abstract: An image display apparatus includes a first lamp, a second lamp and a power supply unit for supplying electric power to the first or second lamp. In the image display apparatus, while a lamp to which electric power is to be supplied from the power supply unit is switched between the first lamp and the second lamp, the light generated by the first lamp or the second lamp is inhibited from being emitted outside.

Abstract: A lamp operation device includes a mode setting part that sets an operation mode for lamps, and a lamp operation part that controls switching between the lamps in accordance with the set operation mode. The lamp operation part includes a process corresponding to a manual switching mode in which a lamp selected by a user is set as an illumination lamp, and a process corresponding to an automatic switching mode in which the plurality of lamps is automatically set in sequence as an illumination lamp. In the automatic switching mode, after one lamp has been set as the illumination lamp, cumulative illuminating time (amount of change) of the lamp is measured. Then, the illumination lamp is switched to the other lamp, depending on whether a measurement result has exceeded predetermined threshold time.

Abstract: A lamp unit is provided with a storage part that holds lamp management information in a writable and readable manner. A communication control part on a projector main unit side reads the lamp management information from the lamp unit and stores the same in a storage part of the main unit. The lamp management information is updated depending on the status of use of the lamp unit. The updated lamp management information is written back into the storage part of the lamp unit.