Process of aligning and realigning liquid crystal media
US5032009A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1990 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Aug 13, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process of aligning or realigning a liquid crystal medium adjacent to a substrate which process comprises (1) exposing anisotropically absorbing molecules disposed on the substrate, disposed in the liquid crystal medium or which themselves are the liquid crystal medium to linearly polarized light of a wavelength or wavelengths within the absorption band of the anisotropically absorbing molecules, wherein (a) the exposed anisotropically absorbing molecules induce alignment of the liquid crystal medium at an angle + and - .theta. with respect to the direction of the linear polarization of the incident light beam and along a surface of the liquid crystal medium, (b) the liquid crystal medium comprises liquid crystals having a molecular weight of less than 1500, and (c) the anisotropically absorbing molecules are exposed by (i) linearly polarized light transmitted through at least one mask having a pattern, (ii) a beam of linearly polarized light scanned in a pattern or (iii) patterns created by interference of coherent linearly polarized light beams, and (2) terminating exposure, whereby the liquid crystal medium aligned or realigned by the exposure step remains aligned or realigned…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.