LED backlight 23inch LCD TV save25%.pdf - eu energy star
LED backlight 23inch LCD TV save25%.pdf - eu energy star
LED backlight 23inch LCD TV save25%.pdf - eu energy star
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SID May 22 nd , 2003 Baltimore, Maryland<br />
www.lumileds.com<br />
High Brightness Direct <strong>LED</strong> Backlight for <strong>LCD</strong>-<strong>TV</strong><br />
R. Scott West<br />
Huub Konijn, Willem Sillevis-Smitt, Smitt, Simon Kuppens, Nicola Pfeffer, Yourii Martynov<br />
Yagi Takaaki, Stefan Eberle, Tien Wei Tan, Choon Earn Chan, Gerard rd Harbers, Paul S. Martin<br />
1 Copyright (c) Lumileds Lighting LLC Company Confidential
Agenda<br />
1) Design - Luxeon Direct<br />
- Light source - color sequence<br />
- pitch<br />
- System - Mechanical /Optical<br />
>20” <strong>backlight</strong><br />
2) System calculation model<br />
3) 23” <strong>LCD</strong> <strong>TV</strong> demo<br />
4) Conclusions<br />
Luxeon Side Emitter<br />
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Copyright (c) Lumileds Lighting LLC<br />
Lumileds Confidential
Side Emitter - Optical<br />
Ray Trace<br />
Upper zone<br />
> φ c<br />
Path 1<br />
Extended<br />
source effect<br />
Lower zone<br />
α<br />
Path 2<br />
Lens<br />
Die<br />
Body<br />
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Color sequence and Pitch<br />
1) Color sequence - GRBG<br />
2) Pitch = 9mm center to center<br />
9mm<br />
Theoretical analysis - 32 <strong>LED</strong>s @9mm pitch<br />
Color coordinates<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
Color coordinates<br />
0.5<br />
0.45<br />
0.4<br />
0.35<br />
0.3<br />
0.25<br />
u<br />
v<br />
Color deviation<br />
0.02<br />
0.015<br />
0.01<br />
0.005<br />
delta uv<br />
20<br />
0.2<br />
0<br />
-400 -200 0 200 400<br />
Horizontal position, mm<br />
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0.15<br />
-400 -200 0 200 400<br />
Horizontal position, mm<br />
Copyright (c) Lumileds Lighting LLC<br />
Lumileds Confidential<br />
0<br />
-400 -200 0 200 400<br />
Horizontal pos ition, mm
Mechanical - CAD layout<br />
Complete <strong>backlight</strong><br />
Diffuser plate<br />
diverter<br />
Diffuse reflector film<br />
Metal case<br />
Side Emitter 1W<br />
MCPCB<br />
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Optical - Raytrace<br />
~5-8% of the light emitted from the side emitter will be<br />
reflected by the diverter preventing color spots on the<br />
screen<br />
Side light<br />
35%<br />
60%<br />
80% of the light<br />
within + 20 degrees<br />
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Agenda<br />
1) Design - Luxeon Direct<br />
- Light source - color sequence<br />
- pitch<br />
- System - Mechanical /Optical<br />
>20” <strong>backlight</strong><br />
2) System calculation model<br />
3) 23” <strong>LCD</strong> <strong>TV</strong> demo<br />
4) Conclusions<br />
Luxeon Side Emitter<br />
7<br />
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System Calculation Model<br />
Luxeon Direct - system calculation model model<br />
Inputs Independent of Time Assumptions revision #14 5/19/2003<br />
Inputs Independent of Time Assumptions revision #14 5/19/2003<br />
BEF III 50%<br />
BEF III 50%<br />
DBEF 30% Input field - Current<br />
DBEF 30% Input field - Current<br />
Min/Max Brightness Ratio 50% Input field - Production - typical #'s<br />
Min/Max Brightness Ratio 50% Input field - Production - typical #'s<br />
Average<br />
Average<br />
to<br />
to<br />
Peak<br />
Peak<br />
Brightness<br />
Brightness<br />
Ratio<br />
Ratio<br />
75.0%<br />
75.0%<br />
Aspect<br />
Aspect<br />
Ratio<br />
Ratio<br />
(e.g.<br />
(e.g.<br />
4:3<br />
4:3<br />
= 1.33)<br />
1.33)<br />
1.60<br />
1.60<br />
Diagonal Screen Size Size (inches) (inches) 23 23<br />
Width of of Display (cm) (cm) 49.5 49.5<br />
Display Area (square meters) 0.153 0.153<br />
Thickness < 20mm Thickness
Agenda<br />
1) Design - Luxeon Direct<br />
- Light source - color sequence<br />
- pitch<br />
- System - Mechanical /Optical<br />
>20” <strong>backlight</strong><br />
2) System calculation model<br />
3) 23” <strong>LCD</strong> <strong>TV</strong> demo<br />
4) Conclusions<br />
Luxeon Side Emitter<br />
9<br />
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Cebit 23” Luxeon Direct demo<br />
Luxeon RGB side emitters<br />
2 luxeon lightsources, total 104 <strong>LED</strong>S<br />
Backlight thickness 50 mm.<br />
Heatsink thickness 15 mm.<br />
Optical films : diffuser plate, BEF<br />
10<br />
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260 nits<br />
80 Watt<br />
55 o C no fan
Light distribution<br />
Luminance - Cd/m^2<br />
Luminance - Cd/m^2<br />
Backlight RGB 100 %<br />
10197.<br />
9853<br />
9510<br />
9166<br />
8823<br />
8479<br />
8136<br />
7793<br />
7449<br />
7106<br />
6762<br />
6419<br />
6076<br />
5732<br />
5389<br />
5045<br />
4702<br />
Monitor, whitepoint set<br />
318.750<br />
305.000<br />
291.250<br />
277.500<br />
263.750<br />
250.000<br />
236.250<br />
222.500<br />
208.750<br />
195.000<br />
181.250<br />
167.500<br />
153.750<br />
139.999<br />
: .000; Y: .000; Value = 0<br />
X: .000; Y: .000; Value = 0<br />
100 % RGB Whitepoint<br />
Peak luminance 10197 8492<br />
Backlight brightness Center luminance 10065 8386<br />
Average luminance 7555 6270<br />
Peak luminance 384 316<br />
Monitor Brightness Center luminance 381 313<br />
Average luminance 307 252<br />
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Color Uniformity, monitor<br />
0.009<br />
0.008<br />
0.007<br />
0.006<br />
0.005<br />
0.004<br />
0.003<br />
0.002<br />
0.001<br />
-0.001<br />
color uniformity on u’ v’ with<br />
respect to center screen<br />
12<br />
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Luxeon Spectra & color gamut<br />
Monitor<br />
20 x 10-3 spectra<br />
15<br />
Monitor red<br />
Monitor green<br />
Monitor blue<br />
10<br />
5<br />
0<br />
-5<br />
350 400 450 500 550 600 650 700 750 800<br />
wavelength (nm)<br />
Luxeon red<br />
Luxeon green<br />
Luxeon blue<br />
Color Gamut Relative to NTSC<br />
on u’v’:<br />
Monitor FOS: 116 %<br />
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Agenda<br />
1) Design - Luxeon Direct<br />
- Light source - color sequence<br />
- pitch<br />
- System - Mechanical /Optical<br />
>20” <strong>backlight</strong><br />
2) System calculation model<br />
3) 23” <strong>LCD</strong> <strong>TV</strong> demo<br />
4) Conclusions<br />
Luxeon Side Emitter<br />
14<br />
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Copyright (c) Lumileds Lighting LLC<br />
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Conclusions<br />
Phase I Development<br />
Design<br />
- Simplistic Direct <strong>LED</strong> <strong>backlight</strong><br />
- Shallow reflective cavity ~50mm depth<br />
- >20” <strong>LCD</strong> <strong>TV</strong>/monitor<br />
- Light weight<br />
Performance<br />
- Optical efficiency ~ 70%<br />
- Low power<br />
- No fans required (minimum heat)<br />
- Color uniformity 95% of NTSC<br />
- Long life > 50,000 hrs<br />
- blinking <strong>backlight</strong><br />
Phase II Development<br />
- Started - April ’03<br />
Key Goals<br />
1) Thinner designs - target 35mm depth<br />
2) Reduced <strong>LED</strong> content<br />
- brightness dictates # of <strong>LED</strong>s not area<br />
3) Maintain or improve front of<br />
screen performance<br />
15<br />
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High Brightness Direct <strong>LED</strong> Backlight for <strong>LCD</strong> <strong>TV</strong>/monitor<br />
Thank you<br />
16<br />
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Light distribution <strong>backlight</strong>,<br />
horizontal & vertical center screen<br />
Percent of Max<br />
100.000<br />
90.000<br />
80.000<br />
70.000<br />
60.000<br />
50.000<br />
40.000<br />
30.000<br />
20.000<br />
10.000<br />
0.000<br />
Min = 67.8 % o f Ma x<br />
Max = 98.3 % of Max<br />
Average = 88.5 % of Max<br />
-0.20000<br />
-0.10000<br />
0.00000 0.10000 0.20000<br />
Meters<br />
Horizontal<br />
Percent of Max<br />
100.000<br />
90.000<br />
80.000<br />
70.000<br />
60.000<br />
50.000<br />
40.000<br />
30.000<br />
20.000<br />
10.000<br />
0.000<br />
Min = 56.9 % o f Ma x<br />
Max = 98.2 % of Max<br />
Average = 80.1 % of Max<br />
-0.12000<br />
-0.08000<br />
-0.04000<br />
0.00000 0.04000 0.08000 0.12000 0.16000<br />
Meters<br />
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Vertical<br />
Copyright (c) Lumileds Lighting LLC<br />
Lumileds Confidential
Luxeon Spectra & color gamut<br />
Backlight<br />
0.6<br />
0.5<br />
spectra<br />
Luxeon red image<br />
Luxeon green image<br />
Luxeon blue image<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
0<br />
-0.1<br />
350 400 450 500 550 600 650 700 750 800<br />
wavelength (nm)<br />
Luxeon red<br />
Luxeon green<br />
Luxeon blue<br />
Color Gamut Relative to<br />
NTSC on u’v’:<br />
Luxeon: 148 %<br />
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Luxeon lightsource(@350 mA/25°C Tj)<br />
Vf(avg) Lm/W(avg) Ldom(avg) x(avg) y(avg)<br />
Red 2.765 40.900 625.7 0.701 0.298<br />
Green 3.570 42.968 529.0 0.185 0.714<br />
Blue 3.690 4.256 454.1 0.154 0.025<br />
Red l2 no 638-639<br />
50000<br />
lumen(mlm)<br />
40000<br />
30000<br />
20000<br />
10000<br />
0<br />
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26<br />
number<br />
green ledstrip 638-639<br />
70000<br />
60000<br />
lumen(mlm)<br />
50000<br />
40000<br />
30000<br />
20000<br />
10000<br />
0<br />
1<br />
4<br />
7<br />
10<br />
13<br />
16<br />
19<br />
22<br />
25<br />
28<br />
31<br />
34<br />
37<br />
40<br />
43<br />
46<br />
49<br />
52<br />
Series1<br />
number<br />
L2 no 638-639 Blue<br />
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lumen(mlm)<br />
7000<br />
6000<br />
5000<br />
4000<br />
3000<br />
2000<br />
1000<br />
0<br />
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26<br />
number<br />
Copyright (c) Lumileds Lighting LLC<br />
Lumileds Confidential
Luxeon – Structurally Different<br />
Cross section view of 5mm <strong>LED</strong><br />
Cross section view of Luxeon Emitter<br />
20<br />
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White <strong>LED</strong> Lumen Maintenance<br />
120%<br />
Relative Light Output<br />
100%<br />
80%<br />
60%<br />
40%<br />
20%<br />
0%<br />
Lighting Research Center - Sept 2002<br />
0 2000 4000 6000 8000 10000 12000 14000<br />
Time (hrs)<br />
5-mm white <strong>LED</strong><br />
High-Power <strong>LED</strong><br />
• Luxeon <strong>LED</strong>s have superior lumen maintenance to epoxy encapsulated (5mm, surface<br />
mount, etc.) <strong>LED</strong>s by design<br />
• Ongoing tests show Luxeon is stable through 10,000 hours by which time 5mm <strong>LED</strong>s have<br />
degraded ~70% and Incandescent bulbs have died<br />
• Luxeon (colored and white) is expected to show an astounding 70% average lumen<br />
maintenance (30% degradation) even after 50,000 hours<br />
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Additional information<br />
More technical information<br />
http://www.lumileds.com/solutions/<strong>LCD</strong>/techinfo_index.htm<br />
Information on Luxeon<br />
www.luxeon.com<br />
Information on Lumileds<br />
www.lumileds.com<br />
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