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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 TECHNOLOGYEfficiency, 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 • Uniformity • Fern-Howard & Rambus Reference Lightguides • In Conclusion
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?
Why Use Edge Lighting Technology? • Luminaire designers have always had to manage issues of: • Efficiency • Light Distribution • Uniformity • Appearance
Why Use Edge Lighting Technology? LED is no different … • Directional Output • High Glare • Visual Appearance • Efficiency
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
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
Principles Of Edge Lighting Technology Edge Lighting uses the principle of Total Internal Reflection (TIR)
Principles Of Edge Lighting Technology Light travels and bounces along the lightguide until it hits a disruption feature
LED Backlit Module Compared to Edge Lit Module Optical & Diffusing Films (optional) LED’s Lightguide
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
Comparison of Edge Lighting Approaches
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
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 + =
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
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
Patterning Technology Performance Comparison:Printed Dot vs. Laser Etched vs. MicroLens Optical Efficiency
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
Optical Uniformity High Uniformity is achieved by statistical mapping of lens density across the surface of the lightguide
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
Fern-Howard, Rambus Reference Lightguides A recent collaboration with Rambus has seen us launch a range of Reference Lightguide designs
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
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
Thank you for the opportunity to present to you today Are there any questions?