Drive schemes for gray scale bistable cholesteric reflective displays utilizing variable frequency pulses
US7023409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2001 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Dec 31, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0486
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of addressing a bistable liquid crystal material having incremental reflectance properties disposed between opposed substrates is disclosed. One substrate has a first plurality of electrodes deposited thereon facing a second substrate which has a second plurality of electrodes disposed thereon. The intersection of the first and second plurality of electrodes forms a plurality of pixels. The addressing method includes applying a predetermined number of pulses to the first plurality of electrodes, and applying a like number of the predetermined number of pulses to the second plurality of electrodes. Each of the predetermined number of pulses has a different frequency, wherein the predetermined number of pulses are applied in a set time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.