Patent ID: 7173765

Claim:
An information display system comprising: a head-mounted unit mounted on the head of an observer for displaying information so that specific information can be observed; and a main unit for generating display data to be displayed on the head-mounted unit, wherein the head-mounted unit comprises a first receiver to receive a power supply instruction signal for supplying electric power to the head-mounted unit from the main unit by radio; and a first power source including a battery for supplying electric power to the head-mounted unit on receiving the power supply instruction signal, and wherein the main unit comprises a signal generator to generate a power supply initiation signal for starting power supply to the main unit; a second power source including a battery for supplying electric power to the main unit on receiving the power supply initiation signal; and a second transmitter to transmit the power supply instruction signal to the first receiving means by radio after power is supplied to the main unit.