Addressing method for a multiplexable, bistable liquid crystal display
US4608558A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1983 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Sep 22, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An addressing method for a multiplexable, bistable liquid crystal display wherein a first driving voltage which is larger than a first limiting voltage is applied to the selected display elements and a second driving voltage which is smaller than a second limiting voltage is applied to the non-selected display elements. For the first driving voltage only a first optical state is stable, and for the second driving voltage only a second optical state is stable. All the display elements are simultaneously switched on the display by means of a single writing voltage pulse. By this means a high-contrast, constant and immediate display is achieved over the entire active area. Row-at-a-time writing is also possible. Moreover, a liquid crystal display is introduced which is based upon the bistability effect and which employs a guest-host liquid crystal containing a chiral additive. The layer thickness of the liquid crystal is less than 10 .mu.m and the ratio of the layer thickness (d) to the liquid crystal pitch (p) of the guest-host liquid crystal lies between 0.5 and 1.75. Spacer particles are distributed over the entire active area of the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.