Cumulative two phase drive scheme for bistable cholesteric reflective displays
US6204835A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1998 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | May 12, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0247
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Bistable cholesteric liquid crystal material is disposed between opposed substrates, wherein one of the substrates has a first plurality of electrodes facing a second plurality of electrodes on the other substrate, wherein the intersection of the first and the second plurality of electrodes forms a plurality of pixels. The material is addressed by applying a preparation voltage across the first and second plurality of electrodes and then subsequently applying a selection voltage across the first and second plurality of electrodes. The material is then allowed to relax for a period of time, whereupon the preparation and selection voltages are reapplied. These steps are repeated until the liquid crystal material obtains the desired reflectance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.