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자동차용 Head Up Display의 LED 방열시스템 최적화에 관한 연구
한상훈(Sanghoon Han),이명래(Myungrae Lee),한영훈(Yeonghoon Han),노종원(Jongwon Noh),박종현(Jonghyun Park) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
This paper is an experimental study of topology optimization and sensitivity analysis for considering conduction heat transfer in a LED thermal management. An optimization example is examined for PCB shape of LED Module of Head Up Display in order to design a heat exchanger as verification. Especially, we simulated the finite element model of the LED PCB and found out the thermal pattern area in which thermal via hole can have influence on the heat dissipation characteristic. The result remarkably shows that changing the topology of PCB Pattern can increase the total heat dissipation performance. The result is verified by the heat dissipation experiments in a real thermal environment of Head Up Display.
이재영(Jaeyoung Lee),유경종(Kyeongjong You),한영훈(Yeonghoon Han) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
We propose a LCD control method based on variable dithering to reduce image sticking caused by orientation change. The proposed method changes dithering patterns to alter the crystal orientation when the image is still and inserts a middle image to remove flicker. Also, the auto light function is implemented by limiting the maximum gradation level and the backlight luminance to change pixel brightness and increasing the dithering pattern size to compensate the reduction in the number of gradation steps. To verify the suggested method, an Ioniq image is used. The analysis results based on the Weibull distribution shows that the proposed method provides the 257% lower probability of the image retention occurrence.