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Abstract
For a potential application in thin-film-transistor liquid crystal display (TFT-LCD) manufacturing as a multi-functioning layer working as an overcoat layer and LC alignment layer simultaneously, a novel chloromethylated polyimide was synthesized. The electrical performances of liquid crystal (LC) cells with chloromethylated polyimide alignment layers were investigated. The polymer layer acted as a multifunctional layer that does role of planarization layer and photo-alignment layer with high photosensitivity and excellent thermal stability, simultaneously. The capacitance-voltage characteristics of LC cells fabricated from the photo-aligned layers were measured. The LC cells with rubbed and photo-aligned layer showed higher residual DC values and corresponding lower voltage holding ratios compared to the commercial alignment layer, probably due to the photo-induced ionic charges on the alignment layer. Mechanical rubbing of the extensively purified polymer layer did not generate much difference in residual DC when compared to commercial polyimides.
Acknowledgments
This research was supported by the Program for the Training of Graduate Students in Regional Innovation which was conducted by the MOCIE of the Korean Government. This work was supported by Grant no. R01-2004-000-10014-0 from the Korea Science and Engineering Foundation.
Notes
*R-DC value in parenthesis was measured after repetitive purification processes.