Button input device using E-paper

A button input device comprising:

• a plurality of buttons arranged at the same level, each of the buttons including a transparent window and a base portion downwardly protruding from an outer edge of the transparent window;
• an electronic paper (E-paper) including a plurality of display regions respectively disposed under the transparent windows of the buttons and a plurality of holes through which the base portions of the plurality of buttons respectively pass through;
• an elastic member which is disposed under the E-paper and which is elastically deformed by the base portions of the buttons when the buttons are pressed;
• and
• a switch circuit including a plurality of switches, which are disposed under the elastic member at positions respectively corresponding to lower ends of the base portions of the plurality of buttons, and which generate a signal when the buttons are pressed.

A button input device comprising:

• a button including a transparent window and a plurality of base portions downwardly protruding from outer edges of the transparent window;
• an electronic paper (E-paper) including a display region disposed under the transparent window, and a plurality of holes disposed outside the display region and allowing the base portions of the button to pass through the E-paper;
• an elastic member which is disposed under the E-paper and which is elastically deformed by the base portions of the button when the button is pressed;
• and
• a switch circuit including a switch, which is disposed under the elastic member at a position corresponding to a lower end of the base portions of the button and which generates a signal when the button is pressed.