Transient state information display in an RFID tag having a charge-induced pigment release medium
US8164420B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2008 |
| Grant date | Apr 24, 2012 |
| Priority date | — |
| Expiry date | Jul 10, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0716
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An RFID tag includes a sensor for determining a transient state or condition of a product to which the tag is associated, and a display. The tag may be passive, semi-passive, or active. In response to receipt at the tag of a read signal that includes a first value associated with the transient state or condition, a comparison is performed. The comparison compares the first value, with a second value generated by the sensor in response to receipt of the read signal. As a result of the comparison, an indication is provided on the display. The information displayed is a function of the comparison. In one embodiment, the display provides different color indications depending on the transient state or condition sensed. In an alternative embodiment, the RFID tag display includes an electrical or thermal charge-induced pigment release medium, e.g., an electronic ink, and the tag is used to communicate information about the state of a product to which the tag is associated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.