Nematic liquid crystal storage display device
US4601543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1985 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Oct 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A bistable nematic liquid crystal display cell is switched between topologically equivalent, asymmetric horizontal states. Switching is initiated by application of a directional, symmetry breaking field such as a transverse magnetic field. An electric potential is then applied across the cell to complete the switching cycle and maintain the state. The cell includes upper and lower parallel substrates, upper and lower topographically textured tilt alignment surfaces on the corresponding substrates, and nematic liquid crystal material between the substrates. In an active region of the cell, the tilt alignment surfaces form an equal reverse tilt boundary condition. In an isolation region surrounding the active region of the cell, the tilt alignment surfaces form a parallel tilt boundary condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.