| 摘要 |
In a contactless IC card ( 1 ), a rectification circuit ( 17 ) rectifies an electromagnetic wave received via an antenna ( 10 ) to provide a DC voltage, and an electric double-layer capacitor ( 18 ) quickly stores the power from the rectification circuit ( 17 ). The electric double-layer capacitor ( 18 ) supplies the electric power to circuits such as a modem ( 11 ), CPU ( 12 ), memory ( 13 ), controller IC ( 14 ), driver IC ( 15 ), etc. for operation, and rewrites information for display on a display device ( 16 ) using a cholesteric liquid crystal, ferroelectric liquid crystal or the like.
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