Display system that switches operation according to movement detected

1. A display system comprising a head-mounted display device and an input device for operating the head-mounted display device, wherein

the input device is mounted on an arm or a leg of a user and has a movement detection unit comprising a sensor which detects a movement in a circumferential direction that is circumferential around the periphery of the arm or the leg where the input device is mounted, and

the head-mounted display device

displays an operation screen where an operation is accepted, and

switches the operation on the operation screen according to the movement detected by the movement detection unit, the switching of the operation on the operation screen comprising: determining a relative movement in a circumferential direction that is circumferential around the periphery of the arm or the leg with respect to a direction of the image display unit, based on comparing the movement detected by the movement detection unit relative to the movement of the image display unit detected by the display unit movement detection unit.

2. The display system according to claim 1 , wherein

the head-mounted display device has a display unit movement detection unit comprising a sensor which detects a movement of an image display unit provided in the head-mounted display device,

the switching of the operation on the operation screen further comprises:

switching the operation on the operation screen according to the relative movement thus found.

3. The display system according to claim 2 , wherein

the input device is a wristband-type wearable device.

4. The display system according to claim 1 , wherein

the movement detection unit has

an acceleration sensor with two or more axes, and

a processor which detects the movement from a detection signal of the acceleration sensor.

5. The display system according to claim 1 , wherein

the operation screen is an input board where five characters of the Japanese kana characters are arrayed in one of longitudinal and lateral directions, based on vowels, and ten characters are arrayed in the other of the longitudinal and lateral directions, based on consonants, and

the switching of the operation according to the movement is switching a character selected from among the characters arrayed in the one of the longitudinal and lateral directions on the input board.

6. The display system according to claim 5 , wherein

the input device has a second movement detection unit which detects a movement in a bending direction of a distal end-side part from a joint of the arm or the leg where the input device is mounted, and

the head-mounted display device may switch a character selected from among the characters arrayed in the other of the longitudinal and lateral directions on the input board according to the movement detected by the second movement detection unit.

7. The display system according to claim 1 , wherein,

the input device is a wristband-type wearable device,

the operation screen is an input board where five characters of the Japanese kana characters are arrayed in one of longitudinal and lateral directions, based on vowels, and where ten characters are arrayed in the other of the longitudinal and lateral directions, based on consonants,

the switching of the operation according to the movement is switching vowels on the input board, and

the movement detection unit is configured to detect a movement of holding out the forearm in front of the chest and then rotating the wrist.