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Size Effect of Light Scattering on the Nano-Sized Color Filter Pigment in Liquid Crystal Display
전철규,곽진석 한국광학회 2014 Current Optics and Photonics Vol.18 No.2
This study examined the effects of particle size on the light scattering of a nano-sized color filter pigment used to obtain a range of colors in liquid crystal displays. The contrast ratio is one of the most important characteristics of liquid crystal displays. When a color filter is located between two crossed polarizers, the size of the pigment can give rise to a decrease in the contrast ratio due to Rayleigh scattering by the nanoparticles in the filter. The size effect of the color filter pigment on the contrast ratio was investigated in terms of the depolarization parameter. As an experimental result, the depolarization parameter increased with decreasing pigment size. Therefore, a smaller pigment size can reduce light leakage caused by light scattering in the color filter between two crossed polarizers. The depolarization function was also proposed as a useful function for predicting the decrease in the contrast ratio of the color filter.
Encapsulated Nano-Sized Liquid Crystal Droplet Display with a Single Substrate
전철규,Jing Wang,곽진석 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.8
We present a single-substrate display device characterized by nano-sized liquid crystal droplets that can be applied to various optical devices. The nano-emulsified liquid crystal droplets can be encapsulated, and their size can be controlled through the number of dispersions. We demonstrate the electro-optical characteristics of a single-substrate display device with capsulated liquid crystal droplets with a diameter of approximately 200--300 nm fabricated using the nano-emulsification process for display applications. The contrast ratio, threshold voltage, and response time of a single-substrate display device using nano-sized liquid crystal droplets are approximately 25:1, 12~V, and 46.26 ms, respectively.
전철규 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
액정 디스플레이 기술의 현황과 발전방향, 그리고 차세대 액정 디스플레이 기술을 소개한다. 본 논문에서는 마이크로 및 나노 크기의 액정 캡슐 기술에 대하여 소개하며, 특히 균일한 크기의 액정 액적을 형성하기 위한 단분산 액정 액적 형성방법과 고분자를 이용한 액정을 캡슐 기술에 대한 연구 결과를 소개한다. 마이크로 채널에서의 droplet break-up 과정을 이용하여 균일한 크기를 가지는 액적을 형성할 수 있었으며, coacervatioin 방법을 이용하여 코어-셀 구조를 가지는 액정 캡슐을 제작하였다. 또한 나노 크기의 액정 파우더 제작에 대한 기술을 소개한다.
전도성 유전기판을 이용한 다층기판에서의 Simultaneous Switching Noise 감소 기법
김성진,전철규,이해영 한국마이크로전자및패키징학회 1999 마이크로전자 및 패키징학회지 Vol.6 No.4
본 논문에서는 고속 디지털 회로에서 발생하는 Simultaneous Switching Noise (SSN)를 감소하기 위한 다층 기판 구조를 제안하고 시간 영역 시간 차분법 (Finite Difference Time Domain Method)을 이용하여 그 효과를 확인하였다. 제안된 구조는 전원 평면과 접지 평면사이에 전도성 유전체를 전체 또는 부분적으로 삽입한 구조로 혼신 전압파의 크기를 각각 최대 85%, 55% 까지 줄일 수 있어 고속 고성능 디지털 시스템 구현에 효과적으로 적용될 수 있다. In this paper, we proposed a simultaneous switching noise (SSN) reduction technique in multi-layer boards (MLB) for high-speed digital applications and analyzed it using the Finite Difference Time Domain (FDTD) method. The new structure using conductive dielectric substrates is effective for the reduction of SSN couplings and resonances. The uniform insertion of the conducive layer reduced the SSN coupling and resonance by 85% and the partial insertion only around the edges reduced by 55% respectively.
신성식,전철규,한승오,김우영 대한금속·재료학회 2009 ELECTRONIC MATERIALS LETTERS Vol.5 No.4
The polarity effects of dielectric anisotropy on the electro-optical characteristics of a twisted nematic mode driven by a fringe electric field that has wide viewing angle characteristics was the focus of this study. The device used in this study was designed to be a normally black mode between parallel polarizers. The perfect polarization conversion of the incident light, which passed through a polarizer, was achieved when it passed through a twisted Liquid Crystal (LC) layer. When an electric field was applied, the LC molecules with a positive (or negative) dielectric anisotropy rotated parallel (or perpendicular) to the horizontal component of a fringe electric field as the transmittance increased. According to the calculated results, an enhanced transmittance of the Fringe Field-Twisted Nematic (FF-TN) mode with a positive dielectric anisotropy of + 8.2 was be obtained.