Design and applications of new fluorinated liquid crystals of fused ring systems for active matrix LCD

Haruyoshi Takatsu; Sadao Takehara; Kiyofumi Takeuchi; Yoshinori Iwashita

doi:10.1117/12.449938

11 December 2001 Design and applications of new fluorinated liquid crystals of fused ring systems for active matrix LCD

Haruyoshi Takatsu, Sadao Takehara, Kiyofumi Takeuchi, Yoshinori Iwashita

Proceedings Volume 4463, Liquid Crystals V; (2001) https://doi.org/10.1117/12.449938
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The thermal and physical properties of several new classes of fluorinated liquid crystals of fused ring systems are discussed. The fluorinated phenyl-decahydronaphthalenes have low birefringence and relatively high clearing points. The naphthalenes with four fluoro-groups, including a fluoro- substituent at C-1 position for the naphthalene ring, have large dielectric anisotropy, large birefringence and low visco-elastic ratio which leads to quick response time in a twisted nematic liquid crystal display (TN-LCD). The pentafluorinated tetrahydronaphthalene has large dielectric anisotropy with relatively low birefringence and exhibits good stability of nematic phase at low temperature. We have designed some liquid crystal mixtures for an active matrix LCD with advanced performance. The liquid crystal mixtures with low birefringence, sufficiently high voltage holding ratio and wide operating temperature range, which are suitable for a reflective liquid crystal display, have been achieved. The liquid crystal mixtures, which exhibit about 10 ms of quick response time for a TN-LCD and are suitable for TV, also have been achieved.

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Haruyoshi Takatsu, Sadao Takehara, Kiyofumi Takeuchi, and Yoshinori Iwashita "Design and applications of new fluorinated liquid crystals of fused ring systems for active matrix LCD", Proc. SPIE 4463, Liquid Crystals V, (11 December 2001); https://doi.org/10.1117/12.449938

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