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마이크로 LED 전사, 접합, 그리고 불량 화소 수리 기술
최광성,엄용성,문석환,윤호경,주지호,최광문,Choi, K.S.,Eom, Y.S.,Moon, S.H.,Yun, H.G.,Joo, J.,Choi, G.M. 한국전자통신연구원 2022 전자통신동향분석 Vol.37 No.2
MicroLEDs have various advantages and application areas and are in the spotlight as next-generation displays. Nevertheless, the commercialization of microLEDs is slow because of high cost as well as difficulties in the transfer, bonding, and bad pixel repairing process. In this study, we review the development trends of transfer, bonding, and defective pixel repair technologies, which are critical for microLED commercialization, focusing on materials that determine these technologies. In addition, we focus on the simultaneous transfer bonding technology developed by the Electronics and Telecommunications Research Institute, which has been attracting enormous research attention recently.
K. S. Kim(김경석),Y. H. Kim(김영훈),J. In. Han(한정인),K. N. Choi(최광남),S. K. Kwak(곽성관),D. S. Kim(김동식),K. S. Chung(정관수) 한국진공학회(ASCT) 2008 Applied Science and Convergence Technology Vol.17 No.5
본 논문은 TIPS Pentacene을 유기반도체로 사용한 유기박막 트랜지스터의 용제에 따른 전기적 특성에 대한 연구로서, 용제로는 chlorobenzene, p-xylene, chloroform, toluene을 사용하였으며, 회전 도포 방법을 사용하여 TIPS pentacene을 혼합하여 적층하였다. chlorobenzene을 사용하여 만들어진 유기박막 트랜지스터는 1.0×10?² ㎠/Vㆍs의 전계효과 이동도, 4.3×10³의 on/off 비율, 5.5 V의 문턱전압의 특성을 보였다. 반대로, chloroform을 사용하여 만들어진 유기박막 트랜지스터는 5.8×10?? ㎠/Vㆍs의 전계효과 이동도, 1.1×10²의 on/off 비율, 1.7 V의 문턱전압의 특성을 보였다. 또한 각 용제에 따른 TIPS pentacene 결정크기를 AFM을 통하여 측정하였다. 이와 같은 결과들을 통하여, 더 높은 끊는점을 가진 용제는 TIPS Pentacene의 더 큰 결정 크기와 높은 결정화 성향으로 인하여 더 좋은 전기적 특성을 가지는 것을 확인할 수 있었으며, 본 실험에서는 끓는점이 가장 높은 chlorobenzene을 사용한 TIPS Pentacene 유기박막 트랜지스터가 가장 좋은 전기적 특성을 나타내는 것을 확인하였다. In this paper, we investigated the electrical properties of triisopropylsilyl (TIPS) pentacene organic thin-film transistor (OTFT) depending on solvent type. We spin coated TIPS pentacene by using chlorobenzene, p-xylene, chloroform, and toluene as solvents. Fabricated OTFT with chlorobenzene shows field-effect mobility of 1.0×10?² ㎠/Vㆍs, on/off ratio of 4.3×10³ and threshold voltage of 5.5 V. In contrast, with chloroform, the mobility is 5.8×10?? ㎠/Vㆍs, on/off ratio of 1.1×10² and threshold voltage of 1.7 V. Moreover we measured the grain size of each TIPS pentacene solvent by atomic force microscopy (AFM). From these results, it can be concluded that a solvent with higher boiling point results in better electrical characteristics due to large grain size and high crystallinity of TIPS pentacene layer. In this paper TIPS pentacene with chlorobenzene shows the best electrical properties.
최광용(K. Y. Choi),김영주(Y. J. Kim),김헌영(H. Y. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
This paper presents some results of analytical work focused on finding the optimal mold design predicting post-deformation in the analysis of heat resistance test. The procedure was applied to the injection molding process of front fender of passenger car. The warpage of product was obtained from the residual stress after filling. packing and cooling process and the post-deformation due to the heat resistance test could be calculated in the structural analysis of the product at the ejection temperature with the initial condition of residual stress. the boundary condition and heat resistance conditions. The analysis gave some useful guide lines in the design of automative plastic parts which should satisfy heat resistance regulation.