Linear Lighting Tray Optics for High-CRI Uniform Light
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Solution Overview
Problem
Conventional linear lighting systems face issues with low color rendering index (CRI) values due to the use of white phosphor-converted LEDs, leading to increased cost, complexity, and power inefficiency when paired with red LEDs, and are unsuitable for direct viewing due to discernable LEDs.
Innovation Solution
The use of photo-luminescent materials integrated with white phosphor-converted LEDs to enhance CRI, combined with reflective surfaces and lenses to create a uniform line of light, eliminating the need for red LEDs and improving light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If white phosphor-converted LEDs are used in linear lighting systems, then the system structure is simplified, but the color rendering index (CRI) value becomes low
Solution Approach 1:
The patent combines white phosphor-converted LEDs with red LEDs in a hybrid configuration. The white LEDs provide general illumination while red LEDs enhance the red spectrum component, achieving high CRI (>95) without requiring complete redesign of the lighting system. This composite approach merges the simplicity of white LED technology with the color rendering benefits of red LED supplementation.
2Illumination intensity
If red LEDs are paired with white phosphor-converted LEDs to improve CRI, then the color rendering index increases, but the cost and device complexity increase
Solution Approach 1:
Instead of uniformly distributing red LEDs throughout the system, the patent places red LEDs specifically at positions where they can most effectively supplement the red spectrum. The red LEDs are positioned to target specific angular ranges and spatial zones, optimizing their contribution to CRI while minimizing their quantity and associated complexity.
Solution Approach 2:
The patent uses a limited number of red LEDs rather than full spectral coverage LEDs, applying partial action principle. By strategically placing only enough red LEDs to achieve the critical red spectrum enhancement needed for high CRI, the system avoids the complexity and cost of complete spectral reconstruction while achieving >95 CRI values.
3Illumination intensity
If red LEDs are paired with white phosphor-converted LEDs to improve CRI, then the color rendering index increases, but power efficiency decreases
Solution Approach 1:
The patent optimizes the operational parameters of the red LEDs, including their drive current, pulse width modulation (PWM) duty cycles, and spatial distribution. By carefully controlling the intensity and timing of red LED operation, the system achieves sufficient red spectrum enhancement for high CRI while minimizing power consumption. The red LEDs operate at lower power levels than traditional full-spectrum solutions.
4Device complexity
If conventional linear lighting systems are used, then the structure is simple, but they are unsuitable for direct viewing due to discernable LEDs
Solution Approach 1:
The patent transitions from point-source LED emission to a linear continuous light distribution by arranging LEDs along a linear substrate and using optical elements to distribute light uniformly along the line. This dimensional transformation from discrete points to continuous line source creates a smooth, uniform light output that eliminates visible individual LEDs, making the system suitable for direct viewing applications.
Solution Approach 2:
The patent introduces optical intermediaries including diffusers, lenses, and reflective surfaces positioned between the LEDs and the viewing environment. These optical elements scatter and redistribute the light from individual LEDs, creating a uniform apparent light source along the entire linear array. This intermediary layer hides the discrete LED structure while maintaining high light output efficiency.
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 solution achieves high CRI values exceeding 95 with power efficiencies over 100 lumens per watt, enabling direct viewing applications and reducing glare, while maintaining cost-effectiveness and efficiency.
Implementation Method 1
The use of photo-luminescent materials integrated with white phosphor-converted LEDs to enhance CRI
Implementation Method 2
combined with reflective surfaces and lenses to create a uniform line of light
Implementation Method 3
combined with reflective surfaces and lenses to create a uniform line of light
Data Source
AI summary
Linear lighting system including tray extended along elongation directions and having base forming bottom interior surface of tray; first sidewall extending upward from base towards emission aperture of linear lighting system and second sidewall spaced apart across base from first sidewall and extending upward from base towards emission aperture. System further includes circuit board located on first sidewall in tray, plurality of LEDs located on circuit board and mutually spaced apart on first sidewall along elongation directions of tray and positioned for light emissions in directions facing toward second sidewall; and protuberance on base and interposed between LEDs and second sidewall, protuberance positioned for diverting light emissions from plurality of LEDs toward emission aperture. System having tray with first sidewall including angled reflective face and second sidewall including further angled reflective face, the faces positioned for reflecting light emissions toward the emission aperture.