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Liquid Crystal Alignment Film Process Disclosure Number: IPCOM000064829D
Original Publication Date: 1985-Sep-01
Included in the Prior Art Database: 2005-Feb-19

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Campagna, FJ Parker, DE Poley, NM [+details]


The conventional fabrication of liquid crystal displays employs an "alignment film" deposition process. The liquid crystal alignment material is deposited on the surface of the cell plates by such methods as a two-stage orientation evaporation technique or by dispersions of long-chain polymers, such as polyvinyl alcohol, applied by unidirectional rubbing on the glass surface of the cell plates. Each of these techniques has undesirable limitations. Polymer rubbing cannot be used on a thin film transistor silicon array due to the potential for device damage or contamination. Evaporation of silicon-oxide, on the other hand, is a complex process with substrate size limitations which does not lend itself to high manufacturing yield.