Chinese Optics, Volume. 17, Issue 1, 217(2024)
Optical simulation design of surface mounted device beads for wide beam and high uniformity display
Fig. 1. Top view of the LED device structure rendered using TracePro software
Fig. 4. Schematic diagram of far-field light distributions of 5050 surface-mount technology (SMT) beads with Al brackets and PMMA packaging material at different inclination angles
Fig. 5. Far-field light distributions of 5050 SMT beads with different packaging heights, Al brackets, and PMMA packaging materials at an inclination of 85°.
Fig. 6. Far-field light distributions of 5050 SMT beads with different support materials, a packaging height of 0.08 mm, and Al support at an inclination of 85°
Fig. 7. Far-field light distributions of 5050 SMT beads with different material supports and silicone, a packaging height of 0.08 mm, and a sapphire thickness of 0.05 mm at an inclination angle of 85°
Fig. 8. Far-field light distributions of 5050 SMT beads with different chip sizes and Al brackets, and PMMA packaging materials at an inclination angle of 85°
Fig. 9. Far-field light distributions of 5050 SMT beads with a sapphire thickness of 30 μm Al brackets, and PMMA packaging materials at an inclination angle of 85°.
Fig. 10. Far-field light distributions of 5050 SMT beads with different sapphire thicknesses, Al brackets and PMMA packaging materials at an inclination of 85°
Table 1. Simulated optical parameters of different bracket materials
View tableView in ArticleTable 1. Simulated optical parameters of different bracket materials
Material Refractive index Absorption index/(mm−1) Cu 1.15 65889 Al 0.7278 152263 Ag 0.886 113067 Ti 1.71 62667 Perfect absorption - 1 Perfect reflection 1 -
Table 2. Simulated optical parameters of different packaging materials
View tableView in ArticleTable 2. Simulated optical parameters of different packaging materials
Material Refractive index Absorption index/(mm−1) Epoxy 2.605 0.0078 PMMA 1.499 0 Silica 1.41 0.01
Table 3. Simulated optical parameters of light-emitting diodes with different sizes
View tableView in ArticleTable 3. Simulated optical parameters of light-emitting diodes with different sizes
Material Thickness Refractive index Absorption index/ (mm−1) Sapphire 30 µm 1.70 0.004 ITO 300 nm 1.50 0 p-GaN 150 nm 2.45 2.300 Active layer (MQW) 100 nm 2.54 25 n-GaN 6.75 µm 2.45 2.3
Table 4. Far-field beam angle and output efficiency of 5050 SMT beads with Al bracket and PMMA packaging materials at different angles
View tableView in ArticleTable 4. Far-field beam angle and output efficiency of 5050 SMT beads with Al bracket and PMMA packaging materials at different angles
Width of square/mm Light-beam angle Light extraction efficiency Number of light beams 5 70 0.288 2 15 50 0.400 2 25 70 0.489 2 35 70 0.505 2 45 160 0.508 1 55 140 0.652 1 65 120 0.654 1 75 50 0.645 2 85 30 0.454 2
Table 5. Far-field beam angles and output efficiencies of 5050 SMT beads with different packaging heights and Al brackets and PMMA packaging material at an inclination of 85°
View tableView in ArticleTable 5. Far-field beam angles and output efficiencies of 5050 SMT beads with different packaging heights and Al brackets and PMMA packaging material at an inclination of 85°
Width of square/mm Light beam angle without reflection Light extraction efficiency Number of light beams 0.01 160 0.369 1 0.02 140 0.477 1 0.04 140 0.570 1 0.06 120 0.612 1 0.08 120 0.638 1
Table 6. Far-field beam angles and output efficiencies of 5050 SMT beads with different packaging materials, and a packaging height of 0.08 mm, Al brackets at an inclination of 85°
View tableView in ArticleTable 6. Far-field beam angles and output efficiencies of 5050 SMT beads with different packaging materials, and a packaging height of 0.08 mm, Al brackets at an inclination of 85°
Material Light beam angle without reflection Light extraction efficiency Number of light beams Cu 140 0.247 1 Al 20 0.574 2 Ag 20 0.615 2 Ti 160 0.194 1 Perfect absorption 120 0.175 1 Perfect reflection 30 0.813 2
Table 7. Far-field beam angles and output efficiencies of 5050 SMT beads with different materials, a packaging height of 0.08 mm, and a sapphire thickness of 0.05 mm packaged with silicone supports at an inclination of 85°
View tableView in ArticleTable 7. Far-field beam angles and output efficiencies of 5050 SMT beads with different materials, a packaging height of 0.08 mm, and a sapphire thickness of 0.05 mm packaged with silicone supports at an inclination of 85°
Width of square/(mm) Light beam angle without reflection Light extraction efficiency Number of light beams Epoxy 30 0.511 2 PMMA 30 0.555 2 Silica 20 0.574 2
Table 8. Beam angles and output efficiencies of 5050 SMT beads with different chip sizes and Al brackets and PMMA packaging materials at an inclination of 85°
View tableView in ArticleTable 8. Beam angles and output efficiencies of 5050 SMT beads with different chip sizes and Al brackets and PMMA packaging materials at an inclination of 85°
Cell size Light beam angle without reflection Light extraction efficiency Number of light beams 30 30 0.521 2 40 30 0.505 2 50 30 0.490 2 100 30 0.456 2
Table 9. Beam angles and output efficiencies of 5050 SMT beads with a sapphire thickness of 30 μm, Al brackets, and PMMA packaging materials at an inclination angle of 85°
View tableView in ArticleTable 9. Beam angles and output efficiencies of 5050 SMT beads with a sapphire thickness of 30 μm, Al brackets, and PMMA packaging materials at an inclination angle of 85°
Diameter of sapphire square structure Angle of light beam without reflection Light extraction efficiency Number of light beams 2 30 0.555 2 3 30 0.554 2 4 30 0.553 2
Table 10. Beam angles and output efficiencies of 5050 SMT beads with different sapphire thicknesses and Al brackets and PMMA packaging materials at an inclination angle of 85°
View tableView in ArticleTable 10. Beam angles and output efficiencies of 5050 SMT beads with different sapphire thicknesses and Al brackets and PMMA packaging materials at an inclination angle of 85°
Sapphire length Light beam angle without reflection Light extraction efficiency Number of light beams 10 30 0.547 2 30 30 0.553 2 50 30 0.553 2
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Wei WEI, Zhi-zhong CHEN, Hao-zhong GUO, Chuan-yu JIA, Fang FANG, Jun ZOU, Qian FANG, You WU, Ming-hao SUN, Qian LI, Yu-han KUANG, Qi-kai YIN, Guo-yi ZHANG. Optical simulation design of surface mounted device beads for wide beam and high uniformity display[J]. Chinese Optics, 2024, 17(1): 217
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Received: Jul. 7, 2023
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Published Online: Mar. 28, 2024
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