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EDGE LIGHTING TECHNOLOGY E fficiency, Control & Uniformity

EDGE LIGHTING TECHNOLOGY E fficiency, Control & Uniformity. Paul Crisp (Managing Director – Fern-Howard Ltd). Agenda. Why Use Edge Lighting Technology? Principles of Edge Lighting Technology Different Approaches to Edge Lighting Optical Control & Application Efficiency Optical Efficiency

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EDGE LIGHTING TECHNOLOGY E fficiency, Control & Uniformity

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  1. EDGE LIGHTING TECHNOLOGYEfficiency, Control & Uniformity Paul Crisp (Managing Director – Fern-Howard Ltd)

  2. Agenda • Why Use Edge Lighting Technology? • Principles of Edge Lighting Technology • Different Approaches to Edge Lighting • Optical Control & Application Efficiency • Optical Efficiency • Uniformity • Fern-Howard & Rambus Reference Lightguides • In Conclusion

  3. Why Use Edge Lighting Technology? LED Edge Lighting has rapidly emerged as the solution of choice for backlighting in the displays and TV market Do the benefits transfer to the Lighting Market?

  4. Why Use Edge Lighting Technology? • Luminaire designers have always had to manage issues of: • Efficiency • Light Distribution • Uniformity • Appearance

  5. Why Use Edge Lighting Technology? LED is no different … • Directional Output • High Glare • Visual Appearance • Efficiency

  6. Why Use Edge Lighting Technology? To resolve issues of Glare and Uniformity diffusing materials are often used, but ….. The compromise is Efficiency Often with as much as 40% reduction in output

  7. Why Use Edge Lighting Technology? Edge Lighting offers an opportunity to produce new and exciting luminaires: • Great uniformity • Thin • No hotspots • Optical Control • Retains LED Efficiency But …….. Not all Edge-lit technology is the same

  8. Principles Of Edge Lighting Technology Edge Lighting uses the principle of Total Internal Reflection (TIR)

  9. Principles Of Edge Lighting Technology Light travels and bounces along the lightguide until it hits a disruption feature

  10. LED Backlit Module Compared to Edge Lit Module Optical & Diffusing Films (optional) LED’s Lightguide

  11. Different Approaches to Edge Lighting Technology There are a range of different ways to create the optical disruption features • Printed Dot • Chemical Etch • Laser Etch • Vee Grooves • Embedded Optics

  12. Comparison of Edge Lighting Approaches      

  13. At Fern-Howard we work with Rambus Inc and use their Embedded MicroLens® Optics Optical Control Most Edge lighting systems have limited optical control and produce a diffuse output Optical features can be varied by depth, shape, density and location and enable output distributions to be optimisedto support any application area

  14. Optical Control And High Application Efficiency Optimized LED-to-light guide interface Custom controlled light output Maximum light extracted from light guide Highest Application Efficiency High Optical Efficiency Precise Ray Angle Control + =

  15. Optical Efficiency – Why is it Important? It is clear that higher optical efficiency can be used to create higher system efficacy Data based on Samsung LM231A excluding thermal losses

  16. Optical Efficiency – Why is it Important? However, high optical efficiency can also be used to reduce LED count and luminaire cost Table shows LED’s required to achieve 3000 lumens @ 90 L/W Data based on Samsung LM231A excluding thermal losses

  17. Patterning Technology Performance Comparison:Printed Dot vs. Laser Etched vs. MicroLens Optical Efficiency

  18. Light-guide with embedded MicroLens optics measured 10% higher efficiency than other light-guides Optical Efficiency * Flux from fixture with MicroLens light guide used as the baseline

  19. Optical Uniformity High Uniformity is achieved by statistical mapping of lens density across the surface of the lightguide

  20. Fern-Howard and Rambus Fern-Howard have been working with Rambus to develop edge-lit lighting products based on their extensive portfolio of Edge lighting patents and technology All our products use the Rambus Embedded MicroLens® Optics and Lens Replication technology, and are injection moulded in our facility in the UK

  21. Fern-Howard, Rambus Reference Lightguides A recent collaboration with Rambus has seen us launch a range of Reference Lightguide designs

  22. Fern-Howard, Rambus Reference Lightguides • Based on Rambus patented embedded optics technology • No upfront development or tooling costs • Common forms with optimised distributions • Compatible with wide range of LED manufacturers • Design flexibility to create the LED / optical configuration you require

  23. Edge lighting Technology offers Luminaire Designers the opportunity to achieve uniformity and application efficiency whilst retaining much of the inherant efficiency that LED offers • Not all Edge Lighting is the same with embedded optics offering the most effective performance from the range of optical disruption techniques commonly used • Our Reference Design range of Edgelitlightguides enables access to Rambus patented embedded optics technology without upfront development and tooling costs

  24. Thank you for the opportunity to present to you today Are there any questions?

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