Lightguide Input Extension for Edge-Lit Hotspot Reduction
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Solution Overview
Problem
Existing edge-lit lighting systems face challenges in achieving efficient optical coupling from the light source to the waveguide, leading to light loss of 10% to 30%, and struggle with controlling light distributions and reducing unwanted artifacts like 'hotspotting' or 'headlamping' along the edges of waveguides.
Innovation Solution
The use of novel edge-lit optical elements that function as diffusers and direct throughput lenses, combined with internal reflection and light scattering layers, to improve light uniformity and reduce hotspotting, along with configurations that integrate seamlessly into ceiling grid systems without impacting plenum requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional edge-lit lighting systems use waveguides positioned close to the light source, then thin form factor is achieved, but optical coupling efficiency deteriorates with 10% to 30% light loss
Solution Approach 1:
The patent introduces an optical coupling layer as an intermediary between the light source and waveguide. This layer has specific optical properties (refractive index, scattering characteristics) that enable efficient light extraction from the LED and coupling into the waveguide, reducing the 10-30% light loss while maintaining the thin form factor design
2Device complexity
If conventional systems use simple waveguide structures, then manufacturing complexity is reduced, but light distribution control deteriorates and hotspotting artifacts appear
Solution Approach 1:
The patent applies local quality by incorporating scattering layers with specific optical properties at strategic locations within the waveguide structure. These scattering layers are positioned to address specific hotspotting issues in certain regions while maintaining overall structural simplicity. The scattering layer has localized refractive index variations that redirect light away from hotspots without requiring complete redesign of the entire waveguide
Solution Approach 2:
The patent uses composite optical materials combining waveguide material with scattering layer material. The composite structure integrates multiple functional properties (light guidance, light scattering, hotspot reduction) into a single manufactured component, controlling light distribution while avoiding the need for separate complex assemblies
3Illumination intensity
If conventional systems use bezels or edge reflectors to improve appearance, then aesthetic appearance improves, but light emitting area percentage decreases
Solution Approach 1:
The patent extracts and eliminates the traditional bezel component from the lighting system. Instead of using a separate bezel structure that would reduce the light emitting area, the invention integrates appearance control directly into the optical elements themselves. The waveguide and scattering layers are designed to produce uniform appearance without requiring additional non-light-emitting structures at the edges
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances light output, uniformity, and reduces hotspotting by optimizing light distribution and reducing the need for bezels, thereby improving the aesthetic appearance and efficiency of lighting fixtures.
Implementation Method 1
internal reflection and light scattering layers, to improve light uniformity and reduce hotspotting
Implementation Method 2
edge-lit optical elements that functions simultaneously as a diffuser and direct throughput lens, as well as an outcoupling TIR light guide
Data Source
AI summary
An optically transmissive component comprises a light scattering extension portion which can be used within an edgelit light fixture to provides benefits in brightness uniformity and visual appearance by scattering light from near an input edge of a light guide or other edgelit optical element. The sequential propagation of light through both the extension portion and main portion of the optically transmissive component significantly reduces the higher brightness and uneven “hotspotting” type visual defects typically produced near the input edge of an edgelit optical system. With appearance constraints removed or reduced, edgelit light fixtures with higher output, higher efficacy, and/or simplified edgelit optical components are enabled. Embodiments include the use of the extension portion of the optically transmissive component extension to mechanically position and retain an edgelit optical element within a light fixture.