Non-contact IC card
US7575175B2 · kind B2 · utility
0Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2003 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Jun 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.