Nanolens Layer Enhances LED Light Mixing
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Solution Overview
Problem
Existing light-emitting diode (LED) technologies face challenges in achieving effective light mixing to produce white light, resulting in poor color mixing, uneven light intensity, and dark regions near the edges of light guides.
Innovation Solution
Incorporating a nanolens layer associated with an encapsulated LED chip, optionally combined with a diffusant layer and reflectors, to enhance light mixing by redirecting and focusing light within the LED light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs of different colors are placed next to each other in a light guide, then white light can be produced through light mixing, but poor color mixing and uneven light intensity occur
Solution Approach 1:
A nanolens layer is introduced as an intermediary component between the LEDs and the light guide plate. This nanolens layer consists of numerous nanoscale lenses that actively redirect and mix light from different colored LEDs, improving color mixing quality and eliminating dark regions at edges without requiring precise LED placement
Solution Approach 2:
The invention changes the optical parameters by introducing a nanolens layer with specific refractive index and nanoscale geometry. This transforms the light propagation characteristics, enabling effective light mixing and eliminating the need for precise LED positioning while achieving uniform color mixing
2Illumination intensity
If a light diffusor is used to mix colors, then color mixing is slightly improved, but dark regions near the edges of the light guide plate persist
Solution Approach 1:
The nanolens layer serves as a superior intermediary compared to conventional diffusors. It actively redirects light rays through refraction at the nanoscale, ensuring uniform light distribution across the entire light guide plate including edge regions, thereby eliminating dark spots while maintaining excellent color mixing
Solution Approach 2:
The nanolens layer comprises numerous spherical or hemispherical nanoscale lenses. This curvature enables effective refraction and redirection of light rays from different colored LEDs, achieving uniform light mixing and eliminating edge dark regions that persist with flat diffusor structures
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
The nanolens layer improves light mixing, leading to more uniform and efficient color mixing, reducing dark regions and enhancing light intensity across the LED light source.
Implementation Method 1
Associated with the upper surface 14 of the encapsulant 12 is a nanolens layer 15. The nanolens layer is designed to redirect light generated by chips 11 causing mixing of the light.
Implementation Method 2
The encapsulant used in the practice of the invention should be optically clear and protect the light-emitting diode chips from the environment.
Data Source
AI summary
A light source that has improved light mixing. The light source uses a nanolens layer in conjunction with an LED light source to enhance the mixing of the colored light emitting from the LED light source.