Display device reflecting visible and infrared radiation
US6034752A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1997 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Mar 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13718
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal display device includes cell wall structure and a chiral nematic liquid crystal material. The cell wall structure and the liquid crystal cooperate to form focal conic and twisted planar textures that are stable in the absence of a field. A device applies an electric field to the liquid crystal for transforming at least a portion of the material to at least one of the focal conic and twisted planar textures. The liquid crystal material has a pitch length effective to reflect radiation having a wavelength in both the visible and the infrared ranges of the electromagnetic spectrum at intensity that is sufficient for viewing by an observer. One liquid crystal material may be disposed in a single region or two liquid crystal materials may be used, each in separate regions. One aspect of the invention is directed to a photolithography method for patterning a substrate of the display. The display may also have multicolor capabilities by including at least two materials that reflect visible light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.