α
CRT(Cathod Ray Tube) 능동 PDP(Plasma Display) ELD(electroluminescent Display) 수동 LCD LED(Light Emitting Diode)
LCD Backlight unit 반사판
Diffuser sheet Reflection sheet Lamp Prism sheet Diffuser sheet Reflection sheet Light guide Lamp
재질 성형성 복굴절현상 내열성 흡수성 투명성 비용 PMMA X X PC X X O O O Zenor O O O O X Arton O O O X O X 재질 PMMA(polymethylmethacrylate) 굴절률 1.49 임계각 42 수직입사시반사율 3.9% Brewster angle 56
air (n=1) PM M A (n=1.49) Total internal refaction SiO 2
0.050 0.03 0.025 n = 1.55 0.155 0.125 n = 1.5
2.3 1.4 Chip 0.8
4505005506006500.20.40.60.81.0RelativeemissionintensityWavelength(nm) 0204060800.00.20.40.60.81.0RelativeluminosityRadiationangle(deg.)
1.0 0.8 LED angular distribution Simulation with ang. dist. Simulation with Lambertian Relative intensity 0.6 0.4 0.2 0.0 0 20 40 60 80 100 Radiation angle (deg.)
8 7 6 A type B type Luminance gain 5 4 3 2 1 0 0 5 10 15 20 25 30 35 40 Distance ( Vertical ) 1.2 0.9 Luminance gain 0.6 0.3 A Type B Type 0.0 0 5 10 15 20 25 30 35 40 Distance(Horizontal)
16 14 12 measured value simulation result(light guide plate) 10 Luminance gain 8 6 4 2 0-2 -90-60 -30 0 30 60 90 Viewing Angle(vertical) 3.2 2.8 2.4 Luminance gain 2.0 1.6 1.2 0.8 0.4 measured value simulation result(light guide plate) 0.0-90 -60-30 0 30 60 90 Viewing angle(horizontla)
16 14 12 measured value simulation result(diffuser) simulation result(light guide plate) Luminance gain 10 8 6 4 2 0-90 -60-30 0 30 60 90 Viewing angle(vertical) 3.2 2.8 2.4 Luminance gain 2.0 1.6 1.2 0.8 0.4 measured value simulation result(diffuser) simulation result(light guide plate) 0.0-90 -60-30 0 30 60 90 Viewing angle(horizontal)
α δ θ i1 θ t1 α θ i 2 α θ t 2
16 simulation result(bef II (one)) simulation result(bef II (two)) simulation result(diffuser) 12 Luminance gain 8 4 0-90 -60-30 0 30 60 90 Viewing angle(vertical) 8 simulation result(bef II(one)) simulation result(bef II(two)) simulation result(diffuser) 6 Luminance gain 4 2 0-90 -60-30 0 30 60 90 Viewing angle(horizontal)
2.4 No conventional prism sheet conventional prism sheet(one) conventional prism sheet(two) 2.0 Luminance gain 1.6 1.2 0.8 0.4 0.0-90 -60-30 0 30 60 90 Viewing angle(vertical) 2.4 No conventional prism sheet conventional prism sheet(one) conventional prism sheet(two) 2.0 Luminance gain 1.6 1.2 0.8 0.4 0.0-90 -60-30 0 30 60 90 Viewing angle(horizontal)
α triangular prism α α α
α α =70 α =90 α =110 α = 130 α =110 α = 120
Luminance gain 2.4 2.0 1.6 1.2 0.8 No prism sheet conventional prism sheet alpha=10 alpha=80 alpha=114 alpha=120 alpha=170 0.4 0.0-90 -60-30 0 30 60 90 Viewing angle(vertical) Luminance gain 2.4 2.0 1.6 1.2 0.8 no prism sheet conventional prism sheet alpha=10 alpha=80 alpha=114 alpha=120 alpha=170 0.4 0.0-90 -60-30 0 30 60 90 viewing angle(horizontal)
rounded prism α β α
Luminance gain 2.4 2.0 1.6 1.2 0.8 No prism sheet conventional prism sheet beta=10 beta=30 beta=90 beta=180 0.4 0.0-90 -60-30 0 30 60 90 Viewing angle(horizontal) Luminance gain 2.4 2.0 1.6 1.2 0.8 No prism sheet conventional prism sheet beta=10 beta=30 beta=90 beta=180 0.4 0.0-90 -60-30 0 30 60 90 Viewing-angle(vertical)
α BEF II α=114 =30 α 90 114 90 0 0 30 peak value (Luminance gain) 13.27091 14.67927 10.41479 누설광의존재여부 반치폭 (FWHM) 40 55 33
16 conventional prism sheet optimization prism sheet(β=30) 12 Luminance gain 8 4 0-90 -60-30 0 30 60 90 viewing angle(vertical) 8 conventional prism sheet optimization prism sheet(β=30) 6 Luminance gain 4 2 0-90 -60-30 0 30 60 90 Viewing angle(horizontal)
16 conventional prism sheet optimization prism sheet(α=114) 12 Luminance gain 8 4 0-90 -60-30 0 30 60 90 viewing angle(vertical) 8 conventional prism sheet optimization prism sheet(α =114) 6 Luminance gain 4 2 0-90 -60-30 0 30 60 90 Viewing angle(horizontal)