표제지
Abstract
목차
제1장 서론 11
1.1. 연구의 배경 11
1.2. 기술의 동향 12
1.3. 연구의 목적 14
제2장 이론적 배경 15
2.1. 면조명의 종류 15
2.1.1. OLED 광원 17
2.1.2. LED를 이용한 면광원 18
2.2. Edge Lighting 방식 LED 면광원 22
2.2.1. 구성 22
2.2.2. 동작원리 25
2.3. 냉장고 내부용 LED 면조명 29
2.3.1. 기존품의 구성 30
2.3.2. 개선품의 구성 33
2.4. Lenticular LGP의 광특성 37
2.4.1. Lenticular LGP의 광직진성 37
2.4.2. Lenticular LGP의 제조공법 41
2.4.3. Lenticular LGP의 Pattern 전사성 실험 43
2.5. 휘도 개선을 위한 휘도 영향인자 선정 47
제3장 실험 및 시뮬레이션 50
3.1. LED Package 수량에 따른 휘도변화 실험 50
3.1.1. 실험 방법 50
3.1.2. 실험 장비 52
3.1.3. 실험 결과 55
3.2. Lenticular LGP의 산높이에 따른 광직진성 변화 해석 61
3.2.1. 해석 조건 61
3.2.2. 해석 결과 64
제4장 결과 고찰 67
4.1. LED Package 수량에 따른 휘도변화 실험 67
4.2. Lenticular LGP의 Pattern 산높이에 따른 광직진도 해석 68
4.3. 개선품 LED 면광원의 성능 68
제5장 결론 70
참고문헌 71
Table 2-1. Comparison of LGP Patterning methods 24
Table 2-2. Comparison of major specifications between Current and Improved one 36
Table 2-3. Test results of lenticular pattern effect and optical straightness by the pattern height 38
Table 2-4. Brightness variations by the direction of formation of lenticular pattern 40
Table 2-5. Comparison of transcribing ratio by the LGP extruding thickness (I) 44
Table 2-6. Comparison of transcribing ratio by the LGP extruding thickness (II) 45
Table 2-7. Variation of transcribing ratio by extruding thickness of LGP 46
Table 3-1. Condition of the number of light on the LED packages 50
Table 3-2. Measurement zones, size and points 51
Table 3-3. Specifications of CA2000 brightness measuring instrument 53
Table 3-4. Measured result on current sample 56
Table 3-5. Measured result on improved sample 58
Table 3-6. Comparison of two sample 59
Table 3-7. Simulation conditions 62
Table 3-8. Design of experiment for calculating optical straightness effect 64
Table 3-9. Simulation result data and images 65
Fig. 1-1. Applications of LED lighting 11
Fig. 2-1. Comparison of LED and OLED 15
Fig. 2-2. OLED panel of NEC Lighting Co. 16
Fig. 2-3. OLED Lighting applications : for desk and hanger 17
Fig. 2-4. OLED structure and lighting Diagram 18
Fig. 2-5. Structure of Direct Lighting type 19
Fig. 2-6. Air gap between LED and diffusion plate in direct lighting type 19
Fig. 2-7. Structure of Edge Lighting type 20
Fig. 2-8. Outside view of LED Array according to Lighting Methods 21
Fig. 2-9. Structures and optical flow of edge lighting type surface light source 22
Fig. 2-10. Optical flow throughout LGP in LED light source 23
Fig. 2-11. Example of LGP Pattern with ink printing 23
Fig. 2-12. Optical simulation result with optical CAE tools edge lighting type 26
Fig. 2-13. Comparison of optical emission in LGP Pattern methods 27
Fig. 2-14. Comparison of LGP Patterning methods 28
Fig. 2-15. double door type refrigerator 29
Fig. 2-16. Lighting position of current product and Lighting image 30
Fig. 2-17. 3D Drawing Assembled of current LED Lighting for Refrigerator 30
Fig. 2-18. 3D parts Drawing of current LED Lighting for Refrigerator 31
Fig. 2-19. 3D drawing assembled of improved LED Lighting for Refrigerator 33
Fig. 2-20. 3D Drawing on parts of inproved LED Lighting for Refrigerator 34
Fig. 2-21. Drawing of PCB Assembly for improved LED Lighting for Refrigerator 35
Fig. 2-22. Actual pictures of On and Off status on improved one. 36
Fig. 2-23. Measurement method of optical straightness and definition of it 39
Fig. 2-24. Roller structure of extruding machine 41
Fig. 2-25. Process change of extruding machine between for normal LGP and lenticular LGP 43
Fig. 2-26. Pattern Height variations according to LGP Thickness in extrusion process. 46
Fig. 2-27. Influence factor of brightness variations of LED surface light for refrigerator 47
Fig. 3-1. Devided zones for brightness measurement 51
Fig. 3-2. Example of measured image data 52
Fig. 3-3. CA2000 Color Analyzer 53
Fig. 3-4. Brightness measurement system 53
Fig. 3-5. Measured 2D images according to the number of LED on current sample 55
Fig. 3-6. Brightness variations of current sample according to the number of LED 56
Fig. 3-7. Measured 2D images according to the number of LED on improved sample 57
Fig. 3-8. Brightness variations of improved sample according to the number of LED 58
Fig. 3-9. Comparison of brightness variations between two samples 60
Fig. 3-10. Test sample structure for calculating optical straightness effect 62
Fig. 3-11. Definition of H, Ph of Lenticular pattern 63
Fig. 3-12. Graph of calculated optical straightness ratio(%) 66