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Liquid crystal (LC) components have been widely used in flat panel display,optical communication and sensing for their advantages of low power consumption,compact size,no moving parts and reliable performance.High quality LC alignment is crucial for good performance of most LC devices that consist of rod-like nematic LC molecules.Among various alignment techniques,photoalignment is considered as a promising one.It can accomplish high quality LC alignment and simplifies the fabrication of multi-domain LC alignments.