Bistable chiral nematic liquid crystal display and method of driving the same
US6703995B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2001 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | May 31, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2300/0842
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A bistable chiral nematic liquid crystal display has pixel address circuits which comprise a first switching device (14) for switching a supply voltage to the remainder of the pixel address circuit and which is controlled by a row address line (10) and a second switching device (16) for allowing or preventing the supply voltage to be provided to the respective portion of the liquid crystal material (18), and Controlled by a column select line (32). This pixel layout and a method of driving the pixel address circuit, including use of a sample and hold circuit, enables a transition of the liquid crystal to the homeotropic or H state to be avoided when the pixel material is desired to remain in the P or FC states between frames, so that the black addressing bar artifact can be avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.