Method for forming alignment layer of LCD
US7214556B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2005 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Aug 3, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a method for forming an alignment layer of an LCD capable of preventing Mura defects when the alignment layer is formed through an LC one drop fill process. The method includes the steps of coating a mixing solution including a solvent and organic polymer materials consisting of polyimide and polyamic acid on the substrates, pre-curing the mixing solution twice with mutually different temperatures, thereby volatizing the solvent and obtaining stable phase-separation between the organic polymer materials and the solvent, and completely curing the pre-cured mixing solution at a temperature of about 180 to 240° C. A primary pre-curing process is performed at a temperature less than 50° C. under vacuum pressure of about −35 to −50 psi, and a secondary pre-curing process is performed at a temperature within a range of about 50 to 75° C. under the same vacuum pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.