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논문 기본 정보

자료유형
학술대회자료
저자정보
Son, Phil-Kook (Department of Electronics Engineering, Research Institute of Computer, Information and Communication, Pusan National University) Park, Jeung-Hun (Department of Electronics Engineering, Research Institute of Computer, Information and Communication, Pusan National University) Cha, Sung-Su (Department of Electronics Engineering, Research Institute of Computer, Information and Communication, Pusan National University) Kim, Jae-Chang (Department of Electronics Engineering, Research Institute of Computer, Information and Communication, Pusan National University) Yoon, Tae-Hoon (Department of Electronics Engineering, Research Institute of Computer, Information and Communication, Pusan National University)
저널정보
한국정보디스플레이학회 한국정보디스플레이학회 International Meeting 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
발행연도
2006.1
수록면
818 - 821 (4page)

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We demonstrate the vertical alignment of liquid crystal on $a-SiO_x$ film surface using the ion beam exposure. Liquid crystal can be aligned vertically by the rotational oblique evaporation of $a-SiO_x$ film. However, the electro-optic switching behavior of liquid crystal along random directions results in disclination lines. We found that we can achieve highly uniform alignment of liquid crystal without disclination lines by using the ion beam exposure. We found from XRD and XPS data that the vertical alignment can be achieved when x approaches 1.5 at the $a-SiO_x$ film surface. We have shown that the pretilt angle can be controlled by changing ion beam parameters, such as the ion beam energy, the angle of incidence, and the exposure time. We found that whether liquid crystals can be aligned vertically or homogeneously on $a-SiO_x$ film can be predicted simply by measuring the change in optical transmittance by deposition of $a-SiO_x$ thin film layers. We also have shown that a liquid crystal cell aligned vertically by the ion beam exposure exhibits the voltage-transmittance curve similar to that of a rubbed polyimide cell.

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