TY - JOUR
T1 - Electro-optical characteristics of the ion-beam-aligned twisted nematic liquid crystal display on a diamond-like-carbon thin film surface
AU - Hwang, Jeoung Yeon
AU - Jo, Yong Min
AU - Rho, Soon Joon
AU - Baik, Hong Koo
AU - Seo, Dae Shik
PY - 2002/9/15
Y1 - 2002/9/15
N2 - Liquid crystal (LC) alignment capabilities and the variation of pretilt angles with ion beam irradiation on diamond-like-carbon (DLC) thin films, and electro-optical (EO) performances of the ion-beam-aligned twisted nematic liquid crystal display (TN-LCD) with oblique ion beam exposure on the DLC thin film surface were studied. A high pretilt angle of 3.5° via ion beam irradiation on the DLC thin film was measured. The LC pretilt angle decreased due to the increase in surface roughness at over 2 min of ion beam (IB) exposure time. It is considered that this roughness increase due to increasing IB exposure time generated the destruction of oriented rings of atoms related to LC alignment. An excellent voltage-transmittance (V-T) curve of the ion-beam-aligned TN-LCD was observed with oblique ion beam exposure on the DLC thin film surface for 1 min. Also, a faster response time for the ion-beam-aligned TN-LCD with oblique ion beam exposure on the DLC thin film surface for 1 min can be achieved. However, the increase of surface roughness as increasing IB exposure time gives rise to the decrease of EO characteristics of the TN-LCDs. Finally, the residual DC property of the ion-beam-aligned TN-LCD with ion beam exposure of 1 min on the DLC thin film surface is almost the same as that of the rubbing-aligned TN-LCD on a polyimide (PI) surface.
AB - Liquid crystal (LC) alignment capabilities and the variation of pretilt angles with ion beam irradiation on diamond-like-carbon (DLC) thin films, and electro-optical (EO) performances of the ion-beam-aligned twisted nematic liquid crystal display (TN-LCD) with oblique ion beam exposure on the DLC thin film surface were studied. A high pretilt angle of 3.5° via ion beam irradiation on the DLC thin film was measured. The LC pretilt angle decreased due to the increase in surface roughness at over 2 min of ion beam (IB) exposure time. It is considered that this roughness increase due to increasing IB exposure time generated the destruction of oriented rings of atoms related to LC alignment. An excellent voltage-transmittance (V-T) curve of the ion-beam-aligned TN-LCD was observed with oblique ion beam exposure on the DLC thin film surface for 1 min. Also, a faster response time for the ion-beam-aligned TN-LCD with oblique ion beam exposure on the DLC thin film surface for 1 min can be achieved. However, the increase of surface roughness as increasing IB exposure time gives rise to the decrease of EO characteristics of the TN-LCDs. Finally, the residual DC property of the ion-beam-aligned TN-LCD with ion beam exposure of 1 min on the DLC thin film surface is almost the same as that of the rubbing-aligned TN-LCD on a polyimide (PI) surface.
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U2 - 10.1143/jjap.41.l992
DO - 10.1143/jjap.41.l992
M3 - Article
AN - SCOPUS:0037107055
SN - 0021-4922
VL - 41
SP - L992-L995
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
IS - 9 A/B
ER -