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김태관,소회섭,김현호,김성수,이재갑 대한금속·재료학회 2008 ELECTRONIC MATERIALS LETTERS Vol.4 No.2
Highly pure 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-PEN) nanofilms were deposited on oxidized silicon wafer substrate surfaces at two different substrate temperatures (25°C and 70°C) via the vacuum thermal evaporation (VTE) method. Atomic force and scanning electron microscope analyses showed that the TIPSPEN films (~55 nm) prepared at two different substrate temperatures commonly have a number of protrusions widespread over the films. The protrusions, which are highly likely to be crystallites, tend to be smoother and grow higher at the elevated substrate temperature (70°C), suggesting an improved crystallinity of the film. However, this study suggests that an optimum substrate temperature higher than 70°C must be found to remove or at least minimize the protrusive morphology of TIPS-PEN semiconducting films as well as to form a perfectly polycrystalline film for an organic thin film transistor device since the morphology of a semiconductor film deeply affects the performance of a transistor.
일체형 Sheetless LCD Backlight의 최적화 설계
전화준,곽진석,권진혁,소회섭 한국물리학회 2016 새물리 Vol.66 No.2
A simplified structure for the backlight unit (BLU) of a liquid crystal display (LCD) was designed by simulating the micro reverse-pyramid array (MRPA) on the top surface of the light guide panel (LGP) in order to eliminate the conventional diffuser sheet and prism sheet. The optimum condition of the sheetless BLU was obtained through optical simulations of the structure and the placement of the MRPA. A uniform luminance was obtained from the LGP by using an exponential function to adjust the position of the MRPA. Also, the conditions for the optimum structure of serration to minimize hotspots were obtained through an optical simulation of the serration form factor. The optimized side angle and the form factor ($\gamma$) of the structure of serration for minial number of hotspots were 50 degrees and 3.3, respectively. The hotspot strength was reduced by as much as a factor of five compared to the strength without any serration optimization. 국민대학교
역피라미드 어레이를 사용한 시트 없는 백라이트 유닛의 광학설계의 최적화 및 휘점 제거
전화준,김지윤,권진혁,소회섭 한국물리학회 2017 New Physics: Sae Mulli Vol.67 No.3
A sheetless backlight unit (BLU) employing a reverse pyramid array on top of the liquid crystal display (LCD) lightguide panel is designed and optimized to remove the hot spots that are formed periodically in front of the light-emitting diodes (LEDs). The dimensions of the basic structure of the reverse pyramids were a 12 $\mu$m upper width, a 54.7 side angle, and a 70 mm length that is the same as the width of the lightguide panel. Ten LEDs having brightnesses of 10 lumens were used at intervals of 10 mm. The sheetless BLU can be made very slim and power efficient by incorporating the optical function of the optical sheets in the lightguide panel. The periodic pattern of the hot spots that are formed at the entrance area of the lightguide panel can be reduced from 48.8\% to 11.5\% in terms of the hot-spot contrast by optimizing the density of the reverse pyramid arrays near the entrance area of the lightguide panel. 역피라미드 어레이를 도광판 상면에 일체형으로 설치함으로써 LCD 백라이트의 구조를 단순화하고, 광효율을 향상시키며, LED 휘점을 제거하는 시트 없는 (sheetless) 백라이트 유닛을 설계 및 최적화하였다. 역 피라미드의 구조는 상부 폭이 12 $\mu$m, 측면 경사각이 54.7도, 길이는 도광판의 폭과 동일하게 70 mm이다. 사용된 LED는 총 10개이며, 10 mm 간격으로 배치되었다. 시트 없는 백라이트 유닛은 광시트들의 기능을 도광판과 일체화함으로써 두께를 얇게 하고, 광효율을 증대할 수 있다. 주기적으로 배치된 LED의 강한 광으로 인하여 백라이트 유닛 입광부 근처에서 발생하는 주기적 패턴을 갖는 휘점 제거를 위하여 도광판 입광부 근처에서 역피라미드 배치 밀도를 조절함으로써 휘점 콘트라스트를 48.8%에서 11.5%로 낮추었다.