PHASE RETARDATION PLATE, AND METHOD FOR MAKING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide thin film phase retardation plates for improving the viewing angle and contrast of liquid crystal displays.

SOLUTION: The retardation plate includes a cholesteric and an A-plate compensators. The A-plate is fabricated using a single substrate onto which a layer of polymerizable reactive mesogens (RMs) is solvent cast. Included in the RMs solution is an additive that migrates to the RM/air interface to lower the surface energy and generate an additive-rich surface layer, which in turn lowers the intrinsic tilt angle of the RMs at the air interface to between 25 degrees and about zero degrees. The solvent is evaporated and the resulting film is polymerized in the liquid crystal phase to permanently orient the liquid crystal. The resulting film may be readily separated from the substrate and shaped into any desired pattern and combined to form nobel compensators. In an alternative embodiment, a compensator having a defined splay through the thin film is formed.

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