Input device and symbol display method thereof

An input device, comprising:

• a physical keyboard element comprising a plurality of buttons and a mechanical structure, wherein the mechanical structure is configured to displace the buttons in a vertical direction;
• and
• a display unit located under the plurality of buttons, wherein the display unit comprises a plurality of display regions to respectively display different display symbols, wherein positions of the plurality of display regions and positions of the plurality of buttons has a corresponding relationship,
• wherein when at least two display symbols corresponds to a same display region and a same button, the same display region is configured to sequentially display the at least two display symbols when the same button is pressed to generate a confirmation signal,
• wherein the input device further comprises a memory element configured to store at least one user information and a setting file, and
• the input device is configured to change display positions of the display symbols in the display regions according to the user information to rearrange the corresponding relationship between the buttons and the display regions, and
• the input device resets trigger signals of buttons as the display symbols in the corresponding display regions according to the setting file and the rearranged corresponding relationship between the buttons and the display regions.