Drive schemes for gray scale bistable cholesteric reflective displays
US6268839A · kind A · utility
118Cited by
34References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 1998 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | May 12, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0486
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A series of drive schemes are used to apply a single phase of at least one voltage pulse to drive a display with a bistable cholesteric liquid crystal material to a gray scale reflectance. Each drive scheme takes into consideration the initial texture of the cholesteric material and the range of voltages that may be applied between maximum and minimum reflectance of the material. Application of the single phase can be implemented by either time modulation or amplitude modulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.