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.
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Issue number||9 A/B|
|Publication status||Published - 2002 Sep 15|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)