Unipolar gray scale drive scheme for cholesteric liquid crystal displays
US8269801B2 · kind B2 · utility
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21References
10Claims
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Key dates
| Filing date | Sep 24, 2008 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | Jul 20, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0486
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A unipolar gray scale drive scheme for passive matrix displays, more specifically, cholesteric liquid crystal displays, capable of creating any number of desired levels of gray scale. The drive scheme is single stage and can use either an amplitude modulation or a pulse width modulation column voltage signal in combination with a selecting row voltage signal to drive a pixel receiving the two intersecting signals to a desired level of gray scale.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.