Process for filling a liquid crystal cell
US5029623A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1990 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Apr 6, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1341
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
After it has been evacuated, a liquid crystal cell whose filling hole is located at a corner of the cell is immersed into a liquid crystal material inside a vacuum jar and immediately raised again, whereby a drop of liquid crystal material forms at the filling hole. Then the vacuum jar is quickly aerated and the cell is filled outside the vacuum jar. The volume of the drop and the volume of the cell have to be brought into line with each other in such a way that the drop volume is at least as great as the volume of the cell interior so that filling can take place with the drop volume only. Due to the fact that filling is accomplished by a method which only involves lowering the liquid crystal cell a short distance, raising it and then holding it with the filling hole downwards until the volume of the drop which has formed following immersion in and withdrawal from the liquid crystal material is completely sucked into it, the process is extremely simple and entails no great device expense while being reliable in operation. A further advantage is that the vacuum jar is occupied for the shortest possible time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.