Fast transitions of large area cholesteric displays
US8217930B2 · kind B2 · utility
1Cited by
17References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2009 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Aug 31, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A gray scale drive scheme for passive matrix displays, more specifically cholesteric liquid crystal displays. Prior to writing an image, the display can be given a black appearance by first driving the pixels to a homeotropic state, then driving the pixels to a focal conic state. The drive scheme then resets pixels by driving the selected pixels to a homeotropic state. Selecting and non-selecting row voltage signals are then used in combination with column voltage signals to write an image to the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.