• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.195-198
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• 2005

Using theoretical analysis based on Landau theory, it is shown that only five phenomenological parameters are necessary to describe the twelve bulk elastic constants of a biaxial nematic phase. Further, a simple method for determining the values of these five parameters experimentally is given. Comparison with the values of the well-known splay, twist, and bend elastic constants of the uniaial nematic is made.

• Journal of the Optical Society of Korea
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• v.20 no.4
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• pp.510-514
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• 2016

The conventional liquid crystal displays (LCDs) have been using optically uniaxial liquid crystal (LC) medium and this often causes a significant image change at oblique viewing angles. We simulated the viewing angle properties of the biaxial nematic (N_b) phase of a bent-core liquid crystal (BLC) and compared the results with the vertically aligned (VA)- and the in-plane switching (IPS)-LCDs. The N_b phase of the BLC showed a smaller transmittance at the dark state as well as a greater contrast ratio at wide viewing angle. The viewing angle property of the N_b-mode without any compensation film was slightly superior to the IPS-mode with the compensation films eliminating the decross of the polarizers at oblique viewing angle.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.300-301
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• 2004

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.324-326
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• 2008

Novel X-shaped molecules containing perfluoroalkyl alkanes as a side chain have been synthesized and characterized. The properties of mesophases were investigated by a combination of differential scanning calorimetry (DSC), polarizing optical microscopy (POM), X-ray diffractometry (XRD) and electro-optical measurements.

• Proceedings of the Optical Society of Korea Conference
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• 2007.02a
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• pp.297-298
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• 2007

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.542-544
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• 2007

New liquid crystalline Y-shaped molecules containing 1,3,4-oxadizoles have been synthesized with variation of terminal groups (R = H, $OCH_3$ or $OC_8H_{17}$). The structures of obtained compounds were identified by FT/IR and NMR spectrometry, and their thermal and liquid crystalline properties were investigated by DSC and polarizing optical microscope.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.330-332
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• 2008

Banana-shaped molecules were synthesized introducing ester linking group into mesogenic unit, varying the central unit with 1,6-, 2,3-naphthylenes, and introducing the hexyloxy group as the terminal flexible unit. The properties of the compounds were characterized by FT-IR, NMR spectroscopy, DSC, polarizing optical microscopy, and X-ray diffractometry.