• 마이크로전자및패키징학회지
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• 제30권3호
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• pp.78-82
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• 2023

본 연구에서는 Reactive mesogen (RM) 기반 λ/2 위상지연 필름과 편광필름을 이용하여 3단계로 투과율 가변이 가능한 스마트윈도우 제조 기술을 제안한다. λ/2 위상지연 필름은 위상차 (Γ) 값이 π (Δn·d=λ/2)이며, 위상지연 필름에 입사된 빛의 진행방향을 필름의 광축에 대칭된 각도로 변환시키는 특징이 있다. 위상지연 필름의 Δn·d 값이 λ/2에 근접할수록 변환 특성이 우수하기 때문에 본 연구에서는 복굴절 물질인 RM 두께별 retardation (Δn·d) 특성 평가를 통해 Δn·d가 λ/2(=275 nm@550 nm)에 근접한 276.1 nm의 값을 갖는 위상지연 필름을 제작하였다. 최종적으로 (편광필름)/(유리기판)/(배향막)/(λ/2 retardation film) 구조의 스마트윈도우를 제작하여 투과모드, 반투과모드, 차단모드에서의 광 투과 특성을 평가하였다. 평가결과 투과율은 각각 35.8%, 27.8%, 18.2%의 값을 나타내었으며, 이를 통해 λ/2 위상지연 필름을 이용하여 3단계로 투과율 제어 가능함을 확인하였다. 또한 150×200 mm² 크기의 스마트윈도우를 구현함으로써 건축물, 자동차 등 다양한 분야의 활용 가능성을 확인하였다.

• 한국염색가공학회지
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• 제16권5호
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• pp.28-34
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• 2004

The polarizing film application exploits the unique physicochemical properties between PVA(Poly vinyl alcohol) film and CTA(Cellulose triacetate) film. However, hardly any research was aimed at improving the adhesion characteristics of the CTA film by radio frequency(RF) plasma treatment at argon(Ar) gaseous state. In this report, we deal with surface treatment technology for protective CTA film developed specifically for high adhesion applications. After Ar plasma, surface of the films is analyzed by atomic force microscopy(AFM), roughness parameter and peel strength. Furthermore, the wetting properties of the CTA film were studied by contact angle analysis. Results obtained for CTA films treated with a glow discharge showed that this technique is sensitive to newly created physical functions. The roughness and peel strength value increased with an increase in treatment time for initial treatment, but showed decreasing trend for continuous treatment time. The result of contact angle measurement refer that the hydrophilicity of surface was increased. AFM studies indicated that no considerable change of surface morphology occurred up to 3 minutes of treatment time, but a considerable uneven of surface structure resulted from treating time after 5 minutes.

• 한국전기전자재료학회논문지
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• 제32권5호
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• pp.382-386
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• 2019

The alignment characteristics of liquid crystal (LC) molecules on a solution-derived lanthanum zinc oxide (LZO) film under ion-beam irradiation were demonstrated. Using the solution process, an LZO film was fabricated on the glass substrate and cured at $100^{\circ}C$. Afterwards, ion-beam irradiation was performed following the LC alignment method. Using this film, an LC cell was fabricated and the characteristics of the LC alignment were verified. Cross polarizing microscopy and the crystal rotation method were used to investigate the alignment state of the LC molecules on the LZO films. Furthermore, field emission scanning electron microscopy and X-ray photoelectron spectroscopy were used to explore the effect of the ion-beam irradiation on the LZO film. Through these, it was confirmed that the ion-beam irradiation induced surface modification, which demonstrated anisotropic physical and chemical surface characteristics. Due to this, uniform LC alignment was achieved. Finally, the residual DC and anchoring energy of the LC cell based on the LZO films were measured using a capacitance-voltage curve.

• 자원리싸이클링
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• 제21권2호
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• pp.53-58
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• 2012

LCD용 편광필름에 핵심적으로 사용되어진 KI (Potassium Iodide) 폐용액으로부터 정제과정을 통해 KI 고농축액 및 고순도 결정을 회수하는 실험을 행하였다. 본 연구에서는 B 및 PVA 등의 불순물을 포함한 1~4% KI 폐액에서 농축 분별결정을 통해 최대 불순물인 붕소화합물을 제거하여 약 50%의 KI 농축액 및 순도 약 95% 이상의 KI 결정을 얻을 수 있었다. 이 결정물을 용매로 세정함으로서 잔량의 불순물을 제거함으로서 약 99.5% 이상의 고순도 KI결정을 얻을 수 있었다. 그리고 전 과정의 농축과정에서의 KI 회수율은 약 90% 이상의 결과를 얻었다.

• Bulletin of the Korean Chemical Society
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• 제31권8호
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• pp.2207-2210
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• 2010

This paper describes the preparation and study of thermally stimulated discharge conductivity (TSDC) study of cellulose triacetate (CTA) - multiwalled carbon nanotubes (MWNTs) film thermoelectrets. TSDC has been carried out in the temperature range 308 - 503 K and at four different polarizing fields. The conductivity of the polymer blends increased with increase in temperature showing a semi-conducting behavior. The apparent activation energy also showed a pronounced effect with the increase in the content of MWNTs.

• 한국기계가공학회지
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• 제13권3호
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• pp.111-117
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• 2014

With the development of technology, the display industry has been focusing on the development of new types of displays, such as bendable and wearable displays. However, the PVA/TAC polarizing film used in the manufacturing of a normal display is associated with low luminance and low efficiency. If the existing polarization film is replaced with a wire grid polarizer, it is possible to reduce the thickness significantly. Moreover enhanced brightness can also be expected. This study confirms the optical properties of the WGP through a simulation.

• 전자공학회논문지A
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• 제29A권11호
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• pp.106-112
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• 1992

In this paper, we analyze the structure characteristics of $As_{40}Se_{50-x}S_{x}Ge_{10}$ system bulk and thin films. As the results of XRD patterns, it identified amorphous state. In order to find the glass transition temperature($T_g$), crystallization($T_c$) and melting point ($T_m$)of bulk sample, it ascertained that TS1gT is 238$^{\circ}C$ in $As_{40}Se_{15}S_{35}Ge_{10}$, and 231$^{\circ}C$ in $As_{40}Se_{25}S_{25}Ge_{10}$ & $As_{40}Se_{50}Ge_{10}$ following the thernal analysis by DSC, DTA, & TGA method. Also it was confirmed the phase seperation of continuous phase and dispertion phase by the optical texture of polarizing microscope and $T_g$ near 20$0^{\circ}C$ in thin film. Therefore, it was found that it occurs the phase seperation of Ge-rich dontinuous phase and Se-rich dispersion phase following the EDS analysis of thin film and the surface SEM photograph.

• Design & Manufacturing
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• 제14권2호
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• pp.14-20
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• 2020

In OLED panel production process, it is necessary to cut a part of protective film as a preprocess for lighting inspection. The current method is to recognize only the fiducial mark of the cut-out panel. Bare Glass Cutting does not compensate for machining cumulative tolerances. Even though process defects still occur, it is necessary to develop technology to solve this problem because only the Align Mark of the panel that has already been cut is used as the reference point for alignment. There is a lot of defective lighting during panel lighting test because the correct protective film is not cut on the panel power and signal application pad position. In laser cutting process to remove the polarizing film / protective film / TSP film of OLED panel, laser processing is not performed immediately after the panel alignment based on the alignment mark only. Therefore, in this paper, we performed real time inspection which minimizes the mechanism tolerance by correcting the laser cutting path of the protective film in real time using Machine Vision. We have studied calibration algorithm of Vision Software coordinate system and real image coordinate system to minimize inspection resolution and position detection error and edge detection algorithm to accurately measure edge of panel.

• 폴리머
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• 제24권5호
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• pp.713-720
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• 2000

수평균 중합도 900 및 교대배열기 함량 63.1%의 교대배열 poly(vinyl alcohol) (s-PVA)을 사용하여 s-PVA/요오드계 편광필름을 제조하였다. 흔성배열 PVA/요오드계 필름과 비교할 때 편광도는 자연신비에서도 99% 이상의 값을 가짐으로써 향상된 결과를 보였으나 투과도는 약간 저하되는 경향을 보였다. 따라서 침지액의 요오드 농도를 보다 낮추고 4배의 연신비를 유지함으로써 우수한 투과도와 편광도를 가지는 필름을 제조할 수 있었다. 한편, s-PVA/요오드 필름의 열수하에서의 탈착은 현저히 억제되었다. 결정화도, (100)면의 결정크기 및 면간거리가 조금씩 감소하거나 더 이상 증가하지 않는 것으로부터 침지시간 초기에는 요오드가 주로 결정영역에서 복합체를 형성하고, 이후에는 주로 결정면 밖에서 복합체를 형성하거나 단순한 물리적인 흡착을 이루고 있음을 확인하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1992년도 추계학술대회 논문집
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• pp.73-76
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• 1992

The amorphous phase of bulk and thin film in the As-Se-S-Ge system was observed by X-ray diffraction. Thermal analysis using DSC, DTA and TGA method has been used for the determination of the glass transition temperature, Tg. The glass transition temperature, Tg for the composition were $238^{\circ}C$ in $As_{40}Se_{15}S_{35}Ge_{10}$ and $231^{\circ}C$ in $AS_{40}Se_{25}S_{25}Ge_{10}$ and $As_{40}Se_{50}Ge_{10}$. The phase seperation of continuous phase and dispersive phase was observed by the optical texture of the polarizing microscope. Also, the glass transition temperature of the thin film was near $200^{\circ}C$. As the results of SEM-EDS analysis, the phase transition of the films by thermal treatment and light illumination was the amorphous to amorphous.