Projector and lamp information management method used for the same

Abstract

This invention provides a projector capable of correctly informing a user of replacement time of a lamp and significantly improving performance and operation reliability. A storage circuit is mounted in a detachable lamp unit for accommodating a lamp, and information on the lamp and so on are stored in the storage circuit. If the switch of a projector proper is turned on, a main circuit reads lamp operating time up to the last time from the storage circuit, and compares the read operating time to replacement time of the lamp stored in advance so that the light is emitted from the lamp if the operating time is less, and display for prompting the lamp replacement is performed if the operating time is more, and the light is emitted from the lamp thereafter. If the switch of the projector proper is turned off, the main circuit adds the operating time of this time to the operating time of the lamp up to the last time read from the storage circuit on turning on the switch and writes it to the storage circuit.

Dependencies are inferred from the claim text.