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Manufacturing method for preparing an alignment layer of a liquid crystal display Disclosure Number: IPCOM000014629D
Original Publication Date: 2000-Jul-01
Included in the Prior Art Database: 2003-Jun-20

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Disclosed is a manufacturing method for preparing an alignment polymer layer of liquid crystal displays. To overcome some problems caused by a conventional rubbing process, solution jet alignment method is proposed in this article. This method adopts a unidirectional high-pressured solution jet to prepare an alignment polymer layer. A rubbing process is widely employed in an industrial level or a laboratory level. Thin polyimide films are the most commonly used alignment layers. Proper surface characters for liquid crystal alignment are achieved by this process. These characters (surface microstructures, polymer conformation, surface energy, etc.) are caused by physical stress of a rubbing process. However, there are several problems as follows; (1) dust (includes micro particles), (2) static electricity (leads to a destruction or a deterioration of switching devices (thin film transistors)), (3) ununiformity of an alignment layer (because of micro steps on a substrate). The solution jet method system proposed here consists of solution jet nozzles, stage for substrate, and pump supplying high-pressured solution jet (see Figure.). Solution jet nozzles control solution jet direction, jet speed , and jet flow rate. The high-pressured solution jet method is able to add an alternative physical stress on an alignment layer. Physical stresses by the solution jet make structural changes on polymer surface, which are micro grooves, conformation of polymer molecules, etc., and induce an anisotropic orientation of polymer molecules along the solution jet direction. As a result liquid crystal alignment is achieved. Substrate