| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique allowing a user to perform operations of a display device without any confusion when a vertical direction of the display device mounted on a rearview mirror of a vehicle is changed. SOLUTION: The portable display device is removable from a mirror device which can be used as the rearview mirror of the vehicle. A plurality of operation members receiving the operations of the user change corresponding operation functions between the plurality of operation members according to the vertical direction of the display device. Thus, the user can perform the operations of the operation parts without any confusion. COPYRIGHT: (C)2011,JPO&INPIT
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