Display cell
US4923286A · kind A · utility
24Cited by
17References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1988 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Nov 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13787
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The described cell comprises a mixture of liquid crystals (26), polarizers (28, 30) and alignment layers (22,24). The liquid crystals mixture includes a chiralic compound which induces a helical structure having a pitch greater than or equal to the thickness of the liquid crystal layer. One alignment layer (24) induces a planar alignment, the other (22) induces a hemeotropic alignment. This cell, of low cost, requires low control voltage and provides a very good contrast and a high multiplexing rate. It may be used to advantage in the manufacture of dots matrix display watches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.