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Mechanism of misalignment failure of liquid-crystal display devices

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3 Author(s)
Kitagawa, Kenji ; Science Univ. of Tokyo, Chiba, Japan ; Kanuma, Yoji ; Ezawa, Masayoshi

Misalignment failure mechanisms which are a problem in twisted nematic liquid-crystal display devices were investigated. A life test which changes the driving conditions of the applied multiplexing voltage was implemented for devices which use estercy-clohexane liquid crystals. The life tests showed that misalignment life is longer with a lower voltage, a smaller duty ratio, and a higher frequency. These results are highly appropriate for models with alternating current electrolysis of the liquid-crystal material. In addition, electrostatic capacity and applied voltage properties were used to study the relationship of liquid-crystal dielectric anisotropy and the coupling coefficient with temporal misalignment changes. The coupling coefficient decreases along with misalignment failure

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Reliability, IEEE Transactions on  (Volume:40 ,  Issue: 3 )