| Summary: | 碩士 === 長庚大學 === 光電工程研究所 === 99 === Optically-compensated bend mode (OCB) delivers advantages in fast response time, wide view angle, and low temperature operation, etc. But the mode requires a warm up time, to transit from splay state to bend state, before the operation. In this study, we propose a novel technique, which not only provides multi-dimensional alignment but also can control the splay state to the bend state transition. The multi-domain structure also exists splay state, twist state and asymmetric splay state. For the multi-dimensional alignment structure, the liquid crystal molecules in the boundary region exhibit irregular arrangement, so they induce disturbance and form the bend core. This effectively controls the splay-to-bend nucleation. When we compared the single-layer and dual-layer multi-dimensional structures, the results showed that the dual-layer horizontal LCP multi-dimensional alignment structure had faster nucleation transition time than the single-layer horizontal LCP multi-dimensional structure. Under the same condition, the transition time was about 34.27 sec and 78.31 sec, respectively. In addition, the transition time of the single-layer vertical LCP multi-dimensional alignment structure was about 22.72 sec. All three multi-dimensional structures showed a difference less than 2 ms in response time from the control group. In this work, we demonstrated a novel technique to form bend transition by multi domain alignment. It keeps the original characteristics of OCB mode. This method is robust, not involving untested new materials, and is compatible with the existing manufacturing techniques for the LCD display industry.
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