Hand-writable polymer dispersed liquid crystal board set with high resistance layer of crosslinking polymer adjacent conductive layer
US5351143A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Jan 25, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1334
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal display device of externally charging type, including a screen from the outside of which display and erasing operations can be repeatedly performed simply, and having an excellent memory retention performance of the recorded image and durability. Also, a hand-writable liquid crystal board set being excellent in operativity, performances, safety, including the above liquid crystal display device as a liquid crystal board. The liquid crystal display device includes a layered structure comprising, in the following order: a conductive layer; a transparent high-electric resistance layer having a volume resistivity of 10.sup.13 .OMEGA..cndot.cm or more in a 20.degree. C. air at a relative humidity of 90%; a liquid crystal-dispersed polymer layer which has a volume resistivity of 10.sup.13 .OMEGA..cndot.cm or more in a 20.degree. C. air at a relative humidity of 90%; and a transparent insulator layer. The hand-writable liquid crystal board set comprises: PA0 (A) a board of the above liquid crystal display device, PA0 (B) display means for displaying recording images onto the board surface, and erasing means for erasing the recorded images; and PA0 (C) a power source for g…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.