Reversible information display medium of liquid crystal type and non-contact IC card utilizing the same
US6773626B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2001 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | Sep 26, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13725
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A reversible information liquid crystal display medium is disclosed which is capable of long term information display, even through extremes of heat and pressure, without the addition of energy to maintain the display. A primary ingredient of the liquid crystal display medium is a liquid crystalline composition of high-molecular liquid crystal in which molecules that can function as a liquid crystal are chemically bound to side chains of a high-molecular polymer skeleton through a flexing group. Low-molecular liquid crystal may be added to the liquid crystalline composition in order to reduce the response speed of the liquid crystalline composition. The liquid crystal display medium may be used in the display portion of a contactless integrated circuit (IC) card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.