Optimisation of alignment materials for minimising residual retardation in in-plane switching liquid crystal display |
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| Authors: | Lee Tae Rim Jin Ho Kim Myung Chul Jun Seung Hee Lee |
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| Institution: | 1. Display and Plasma Research Laboratory, Department of Materials Science and Engineering, Yonsei University, Seoul, South Korea;2. Applied Materials Institute for BIN Convergence, Department of BIN Convergence Technology and Department of Polymer-Nano Science and Technology, Chonbuk National University, Jeonju, South Korea;3. Panel Performance Division, LG Display, Paju-si, South Korea |
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| Abstract: | The light leakage in a black state of in-plane switching (IPS) liquid crystal display (LCD) associated with rubbing process has been investigated. The mechanical rubbing process with a cloth caused orientation disorders in the liquid crystal directors and these partial orientation disorders result in residual retardations of the IPS LCD, causing the light leakages at the black state. In this study, we theoretically estimated how the light leakage is associated with the rubbing uniformity using 2 × 2 Jones matrix equation and also experimentally confirmed how it is associated with structural properties of the alignment layer. The light leakage was clearly reduced in the alignment layer with reduced crystallinity and flexibility. |
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| Keywords: | In-plane field switching alignment layer rubbing contrast ratio |
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