GTB Task Force LED Forward Lighting

Transcription

1 Informal document No. GRE (52nd GRE, 30 March - 2 April 2004, agenda item 26.) GTB Task Force LED Forward Lighting Scope of the Task Force: Propose Modification of Regulation(s) in order to introduce LEDs for forward lighting Objective of this Presentation: Provide information on LED characteristics and proposed modification of regulations and seek early feedback GTB TF-LED 1

2 Design Possibilities GTB TF-LED 2

3 Overview Topics addressed in this presentation LED principle of operation LED evolution LED specific performance parameters LED benefits Proposed amendments to ECE R48 Proposed amendments to headlighting Regs. GTB TF-LED 3

4 Principles of Light Generation Incandescent ECE R37 Gas discharge ECE R99 LED GTB TF-LED 4

5 Principle LED Design GTB TF-LED 5

6 Principle LED Design GTB TF-LED 6

7 How does an LED emit light? Donator Acceptor - + Depletion zone Electrons Holes Metallic Contact Substrate Chip + Electrons recombine with holes Some of these recombinations emit light. - GTB TF-LED 7

8 Development of Efficiency of LED 100 Fluorescent Lamp Shaped AlGaInP /GaP RED -ORANGE- YELLOW Best Device Luminous efficacy (lm/w) 10 1 GaAsP RED Unfiltered Incandescent Lamp Yellow Filtered Red Filtered GaP:Zn,O RED GaAsP:N RED -ORANGE - GaP :N GREEN YELLOW AlGaAs /GaAs RED AlGaInP/ GaAs RED -ORANGE- YELLOW AlGaAs /AlGaAs ~10x Increase / Decade RED AlGaInP/ GaP RED -ORANGE - YELLOW SiC BLUE InGaN BLUE GREEN 0.1 GaAs 0.6 P0.4 RED GTB TF-LED 8

9 Development of Efficiency of white LED Why are LED now interesting for head lighting? Luminous efficacy [lm/w] White LED HID Halogen GTB TF-LED 9

10 LED Evolution High power LED lumen / LED Standard LED GTB TF-LED 10

11 Wave Lengths & Mixing of Colours 0,8 0,7 0,6 0,5 y 0,4 0,3 0,2 0, ,1 0,2 0,3 0,4 0,5 0,6 0,7 x GTB TF-LED 11

12 How to generate White Light Mixing of Colours GTB TF-LED 12

13 White Light Generation RGB-Chips red, green and blue LEDs blue LED and yellow Phosphor UV-LED and red, green and blue phosphor Blue Chip UV- Chip nm nm nm Emission Wavelength GTB TF-LED 13

14 Technical Properties of White LEDs Luminous Intensity versus Time: Relative Light Output (%) Time (hrs) GTB TF-LED 14

15 Technical Properties of LEDs Luminous Intensity versus Temperature (typical): 120% Normalized Flux (lm) 100% 80% 60% 40% 20% White Red / Amber 0% Junction Temperature (C) GTB TF-LED 15

16 Technical Properties of LEDs Colour Drift Versus Temperature: CIE1931 Diagram 0,400 y 0,350 ECE-White Chromaticity coordinate (T=85 C) 0,300 Chromaticity coordinate (T=25 C) Chromaticity coordinate (T=-40 C) 0,250 0,280 0,330 0,380 x 0,430 0,480 GTB TF-LED 16

17 Benefits of LEDs Safety benefits Long life span (vehicle life) Shock and vibration resistance New design possibilities (e.g. for pedestrian protection) Other benefits High optical system efficiency GTB TF-LED 17

18 Proposed Amendments to ECE R48 Add LED Modules Existing: Light source module" means an optical part of a device which is specific to that device, is containing one or more non-replaceable light sources, and is only removable from its device with the use of tool(s) Proposed amendment: LED module means a light source module with all light sources being LEDs Fail safe provisions Provisions for levelling & cleaning GTB TF-LED 18

19 Proposed Amendments to Frontlighting Regs No new ECE regulation(s) Add LED modules & LED specific requirements to Reg 112 Review voltage specifications for measurements Establish new Annex LED Module Requirements General specifications, manufacture, test conditions Minimal red content and max. UV content Temperature stability (luminous intensity and colour) Use similar annex for other relevant regulations: AFS, NFF, R113, R98 (bending light) GTB TF-LED 19

20 Automotive LED Applications LED application in current automotive lighting: Interior Dashboard illumination in different colours Exterior Red: Rear position lamps Stop lamps Amber: Direction indicators GTB TF-LED 20

21 Design Possibilities LED Headlamps GTB TF-LED 21

22 Design Possibilities LED Headlamps GTB TF-LED 22

23 Design Possibilities LED Headlamps GTB TF-LED 23

24 Design Possibilities LED Headlamps GTB TF-LED 24

25 Any Any Questions Questions? GTB TF-LED 25

26 Notes: GTB TF-LED 26