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Your search keyword '"Kim, Hee Seop"' showing total 21 results
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21 results on '"Kim, Hee Seop"'

3. Formation of liquid crystal multi-domains with different threshold voltages by varying the surface anchoring energy.

Author

Lee, Ji-Hoon, Jin, Huillian, Kim, Jung-Wook, Kim, Ki-Han, Park, Byung Wok, Yoon, Tae-Hoon, Kim, Hoon, Shin, Ki-Chul, and Kim, Hee Seop

Subjects
LIQUIDS, TRANSISTORS, CAPACITORS, PHOTOMASKS, SURFACES (Physics)
Abstract

We propose methods to obtain multi-domains with different threshold voltages for vertically aligned liquid crystal displays without additional transistors or capacitors. We exposed an ultraviolet light through a photomask and spatially varied the surface anchoring energy by partially decomposing the polyimide or inducing the adsorption of reactive monomers. The threshold voltage was reduced with smaller surface anchoring, and the reduction of the threshold could be qualitatively interpreted using a model describing a weak anchoring condition. [ABSTRACT FROM AUTHOR]

Published
2012
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12. P‐94: Nano‐particle Induced VA‐LCD

Author

Choi, Young Eun, primary, Oh, Sang Hoon, additional, Jo, Mi Hyeon, additional, Jang, In Won, additional, Kim, So Eun, additional, Jeong, Kwang‐Un, additional, Lee, Seung Hee, additional, Song, Won Il, additional, Chang, Hak Seon, additional, Shin, Ki Chul, additional, and Kim, Hee Seop, additional

Published
2012
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19. Surface Pinning Effect on Blue-Phase Liquid Crystal.

Author

Park, Hye Ryung, Lee, Jung Jin, Jeong, Heon, Nayek, Prasenjit, Lee, Seung Hee, Park, Heung Shik, Lee, Hyeok Jin, and Kim, Hee Seop

Subjects
LIQUID crystal devices, LIQUID crystals spectra, POLYMER liquid crystals, MESOMORPHIC transitions, ELECTRIC field strength
Abstract

This paper reports surface treatment effect on liquid crystalline blue phase morphology and electro-optical performances at various temperatures. We have succeeded to achieve homogeneous monodomain blue phase morphology by surface treatment. Operating voltage and hysteresis of the proposed device is greatly reduced compared to the non surface treated cell, owing to dramatic increase in Kerr constant. Uniform mono domain morphology has better electric field withstand capability so that its original texture restored after electric field addressing. [ABSTRACT FROM AUTHOR]

Published
2012
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21. Nano-particle Induced VA-LCD.

Author

Choi, Young Eun, Oh, Sang Hoon, Jo, Mi Hyeon, Jang, In Won, Kim, So Eun, Jeong, Kwang-Un, Lee, Seung Hee, Song, Won Il, Chang, Hak Seon, Shin, Ki Chul, and Kim, Hee Seop

Subjects
SILICONES, SILICON polymers, ORGANOSILICON compounds, PHENETHYLAMINES, IMAGE quality of liquid crystal displays, LIQUID crystal displays
Abstract

A nano-material called POSS (Phenethyl-Poly Oligomeric Silsesquioxane) provides vertical alignment of LC on substrate without using conventional polymer type of vertical alignment layer. However, it still has many problems like aggregation because of high concentration doping. We synthesise new type of POSS which shows good dispersion with LC and found out that even very low 0.1 wt % into LC, uniform vertical alignment is achieved through diffusuion process from bulk LC to surface of the substrates. [ABSTRACT FROM AUTHOR]

Published
2012
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