When the information processing device is powered off, the microprocessor saves data held in the register of the microprocessor in the main storage unit.
The generation of the write pulse, the scan pulse, and the sustain pulse is stopped during a predetermined period after the plasma display device is powered off.
If the cover is opened when in a power off state, cover open/close information which indicates that the cover is opened is saved by an information retaining unit which has an auxiliary power source.
Provided is a head-mounted display that is capable of preventing excessive long-term use, and measuring the timing at which an observer turns the power off before fatigue has excessively accumulated in the observer's eyes.
Each of the power cut-off circuits has a cut-off circuit and a switching element, which are connected between the power supply input terminal and the output circuit in series.