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광배향기술을 이용한 액정의 프리틸트각 발생에 관한 연구
한정민,서대식,황율연 崇實大學校 生産技術硏究所 1997 論文集 Vol.27 No.1
We investigated the pretilt angle generation for nematic liquid crystal (NLC) in the cell with slanted non-polarized ultraviolet (UV) light irradiation on polyimide(PI). It is shown that the monodomain alignment in NLC is obtained in the cell with slanted non-polarized UV irradiation on PI surface. We successfully obtained that the pretilt angle of NLC is generated about 3 degrees in the cell with slanted non-polarized UV irradiation with 70 degrees on PI surface without side chain. Therefore we conclude tha the uniform LC alignment in NLC is attributed to anisotropic dispersion force effect in the cell with slanted non-polarized irradiation on polyimide surface without side chain.
a-TN-LCD의 전기광학특성에 표면액정배향이 미치는 영향
황율연,이창훈,서대식,이보호 崇實大學校 生産技術硏究所 1996 論文集 Vol.26 No.2
The characteristics of the response time and the viewing angle on twisted nematic(TN)-liquid crystal display(LCD) and amorphous (a)-TN-LCD without rubbing were investigated. To measure the Tansmission-Voltage, response time, and viewing angle characteristics, we prepared three kinds of LC cells and then studied the surface liquid crystal alignment effect. It was found that the response time on a-TN-LCD was fast compared to the TN-LCD, and the weak anchoring strength was attributed to the fast response time on a-TN-LCD. Also, we obtained the wide viewing angle characteristics on-a-LCD. We suggest that the liquid crystal alignment effect on LCD device is very important for electro-optical characteristics.
광배향기술을 이용한 액정배향의 기구 및 폴리이미드의 분자구조가 프리틸트각에 미치는 영향
서대식,황율연,이창훈 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.6
In this paper, we investigated the liquid crystal(LC) alignment and generation of pretilt angle by using photo-alignment techniques on two kinds of polyimide(PI) surface, It was found that the uniform alignment for nematic(N) LC is obtained in a cell with slanted UV light irradiation on PI surface without side chain. We successfully observed that the pretilt angle of NLC is generated about $3^{\circ}$ with an incident angle of 70 degree on the PI surface without side chain. It is considered that the pretilt angle generation in NLC is attributed to interaction between the LC molecules and the polymer surfaces.
폴리이미드막표면위에 경사진 자외선 조사를 이용한 네마틱 액정의 배향에 관한 연구
서대식,황율연,이보호 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.5
In this paper, we developed the new non-rubbing liquid crystal (LC) alignment techniques in the cell with slanted non-polarized ultraviolet (UV) light irradiation on polyimide (PI) film. It is shown that the uniform alignment for nematic (N) LC is obtained by using slanted non-polarized UV light irradiation on PI surface. We successfully obtained that the pretilt angle of NLC is generated about 3.3 degree in the cell with slanted non-polarized UV light irradiation with 70 degree on PI surface, for the first time. It is considered that the pretilt angle generation in NLC is attributed to interaction between the LC molecular and the PI, which is broken the polymer by slanted non-polarized UV irradiation. Therefore, we concluded that the uniform LC alignment is attributed to anisotropic dispersion force due to photo depolymerization with slanted non-polarized UV light irradiation on PI surface.
a-TN-LCD의 전기광학특성에 미치는 액정배향의 효과
서대식,이창훈,황율연,이보호,이승희,김향율 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.1
The characteristics of the response time and the viewing angle on twisted nematic (TN) liquid crystal display (LCD) and amorphous (a)-TN-LCD without rubbing were investigated. To measure the tansmission-voltage, response time, and viewing angle characteristics, we prepared three kinds of LC cells and then studied the surface liquid crystal alignment effect. It was found that the response time on A-TN-LCD was fast compared to the TN-I-CD, and the weak anchoring strength was attributed to the fast response time on a-TN-LCD. Also, we obtained the wide viewing angle characteristics on a-TN-LCD. The liquid crystal alignment of LCD device for electro-optical characteristics is discussed in the present paper.