Patent ID: 7896505

Claim:
A projector that can be loaded with lamps of a plurality of kinds, each of a plurality of said lamps loadable into said projector being given a lamp serial code formed by arranging lamp information on the lamp and a check sum in predetermined order, said projector comprising a control circuit for performing a clocking operation of a lamp timer for managing a use time of said lamp loaded in said projector; wherein when an instruction for resetting said lamp timer is given, said control circuit determines that said lamp loaded in said projector is replaced with a predetermined lamp, and displays a GUI, namely Graphical User Interface image for receiving input of said lamp serial code attached to the predetermined lamp, by checking a part corresponding to said check sum in information input as said lamp serial code in said GUI image, said control circuit determines whether the input information is a valid said lamp serial code, when said control circuit determines that the input said information is a valid said lamp serial code, said control circuit permits the resetting of said lamp timer, and when said control circuit determines that the input said information is invalid information other than said lamp serial code, said control circuit prohibits the resetting of said lamp timer.