Title Page
Contents
Abstract 12
1. Introduction 16
2. Research Theory 19
2.1. LED 19
2.2. LED Light Therapy 21
2.3. Thermoelectric Elements 24
3. LED Mask 26
3.1. Analysis of LED Optical Power for LED Mask Production 26
3.1.1. LED Element Selection 26
3.1.2. Analysis of LED Optical Power 27
3.2. Design and Production of the LED Mask 31
3.2.1. Optimal LED light overlap and LED arrangement 31
3.2.2. LED Mask Control and Light Emitting Part Design and Production 33
3.2.3. Characterization Analysis of LED Mask Optical Power 34
3.3. LED Mask Circuit Design 35
3.3.1. Developing Non-Contact Temperature Sensor Circuit for Skin Temperature Measurement 35
3.3.2. Development of LED Driver Control Circuit 36
3.4. Development of LED Mask Main Controller 37
3.4.1. Development of MCU Circuit 37
3.4.2. Development of LCD Circuit 38
4. Circulating System of Water 39
4.1. Development of Circulating System of Water Based on Thermoelectric Elements 39
4.1.1. Development of thermoelectric element, fan, and pump driving circuit 39
4.1.2. Development of PT100 Ω Temperature Sensor Circuit 41
4.1.3. Design of Circulation Control of Water and Cooling Test 42
4.2. Development of LED Mask Software 43
4.2.1. Development of LED Control Program 43
4.2.2. Design of 5-Type Patterns of LED Mask 44
4.2.3. Development of LCD Communication Program 45
5. Constant Temperature Control LED Light-Cold Mask 46
5.1. Constant Temperature Control LED Light-Cold Mask System 46
5.1.1. Constant Temperature Control LED Light-Cold Mask System Diagram 46
5.1.2. Design of LED Light-Cold Mask 5 Pattern 48
5.2. Analysis of LED Light-Cold Mask Temperature Data, Voltage and Current 50
5.2.1. Analysis of Red Wavelength Temperature Data, Voltage and Current 50
5.2.2. Analysis of Green Wavelength Temperature Data, Voltage and Current 53
5.2.3. Analysis of Blue Wavelength Temperature Data, Voltage and Current 56
5.2.4. Analysis of Yellow Wavelength Temperature Data, Voltage and Current 59
5.2.5. Analysis of IR Wavelength Temperature Data, Voltage and Current 62
5.2.6. Analysis of Wound Treatment Pattern Temperature Data, Voltage and Current 65
5.2.7. Analysis of Acne Treatment Pattern Temperature Data, Voltage and Current 68
5.2.8. Analysis of Freckles Treatment Pattern Temperature Data, Voltage and Current 71
5.2.9. Analysis of Collagen Production Pattern Temperature Data, Voltage and Current 74
5.2.10. Analysis of Skin Regeneration Pattern Temperature Data, Voltage and Current 77
6. Conclusion 80
국문초록 82
References 85
Table 1. LED Wavelength Effect 23
Table 2. Characteristics of Thermoelectric Elements 25
Table 3. LED Wavelength Characteristics 26
Table 4. LED Mask Optical Power Value 34
Table 5. LED Light-Cold Mask 5 Pattern Optical Power Value 48
Table 6. LED Light-Cold Mask 5 Pattern 49
Fig. 1. P-N Junction Structure of LED 19
Fig. 2. Thermoelectric Element Structure 24
Fig. 3. LED Optical Out Put Charcteristics by Wavelength 28
Fig. 4. LED PWM Control 29
Fig. 5. Optical Output for Each LED Wavelength Through... 30
Fig. 6. Light Intensity Overlap According to LED Separatio... 31
Fig. 7. LED Mask Flexible PCB 33
Fig. 8. Circuit of Digital Infrared Temperature Sensor 35
Fig. 9. Circuit of LED Driver 36
Fig. 10. Circuit of MCU 37
Fig. 11. Circuit of LCD 38
Fig. 12. Circuit of Thermoelectric Element, Fan, Pump Drive 39
Fig. 13. Circuit of PT100Ω Temperature Sensor 41
Fig. 14. Coolant Temperature Test 43
Fig. 15. Constant Temperature Control LED Light-Cold Mask... 46
Fig. 16. Red Wavelength Temperature Data and Voltage and... 51
Fig. 17. Green Wavelength Temperature Data and Voltage and... 54
Fig. 18. Blue Wavelength Temperature Data and Voltage and... 57
Fig. 19. Yellow Wavelength Temperature Data and Voltage and... 60
Fig. 20. IR Wavelength Temperature Data and Voltage and... 63
Fig. 21. Wound Treatment Pattern Temperature Data and... 66
Fig. 22. Acne Treatment Pattern Temperature Data and... 69
Fig. 23. Freckles Treatment Pattern Temperature Data and... 72
Fig. 24. Collagen Production Pattern Temperature Data and... 75
Fig. 25. Skin Regeneration Pattern Temperature Data and... 78