Chip card with a bistable display
US6372307B1 · kind B1 · utility
5Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | May 30, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a chip card containing a ferroelectric liquid-crystal display containing a ferroelectric liquid-crystal display containing a ferroelectric liquid-crystal layer in which the liquid-crystal layer has optical anisotropy values of ≦0.15 in the region of the operating temperature.The chip card according to the invention is particularly practicable since the display can be switched at voltages ≦15 V, generally ≦5 V. It can be written in a broad temperature range, and is robust to everyday loads, such as pressure, flexing or thermal deformation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.