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Electric-optical Characteristics of LED Flat Light Source in Low Temperature Condition
한정민(Han Jeong Min),심용식(Shim Yong Sik),정찬웅(Jung Chan Oong),오선(Oh Seon),황종선(Hwang Jong Sun),최대섭(Choi Dae Seub) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
LCD (liquid crystal display) industry is needed to goods of high reliability and is interested in products without harmful material. In this experiment, we made the LED backlight unit for Automotive-navigation. And for making this backlight unit we used to eight side emitting type white LEDs with 1W high power of the lumileds company. We could know that this backlight unit releases to 6500 rut in 14W power consumption and start up voltage time is under the15㎳ in the ambient temperature -20 ℃
Study of Optimized Reflector Design for Road Light Using Ray-Tracing Method
최대섭(Dae-Seub Choi),한정민(Jeong-Min Han),심용식(Yong-Sik Shim),정찬웅(Chan-Oong Jeong),오선(Seon Oh) 대한전기학회 2009 전기학회논문지 P Vol.58 No.3
In this study, it was studied about the improved road light design for drivers and pedestrians using forward or reverse ray-tracing method. Many of conventional road lights are not suitable for drivers and pedestrians because it has some serious problems such as glare effect or randomicity of illuminated areas. It was oriented from customary design method which was pointed at simple target such as luminance or electrical power. But it was not truth any more that the high luminance or electrical power consumption mean more bright and good road light. We studied ray-tracing method for road light reflector design to get the several goals. It means that good road light has easy for drivers and pedestrians eyes and illuminating objects on the road clearly. So, we set the design targets such as uniformity on the road area per one road light, shading angles and continuous luminance uniformity on the long distance road. We designed ideal road light conditions using ray-tracing method. We set the height of drivers and pedestrians eyes and calculated design guideline to make above design targets. Then we designed road light reflector using reverse ray-tracing method. And we achieved same luminance on the road almost half power consumption because we reduced loss of light. We achieved ideal design guide as 75 degrees of shading angles and 0.5 of luminance uniformity on the road area. It is superior than conventional road light ability such as 0.35 of luminance uniformity of 400 watts power consumption lamp. Finally, we suggested reflector design for 250 watts power consumption CDM Iight source.