Layered Phosphor LED Lighting for Uniform Color Mixing
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Solution Overview
Problem
Existing LED lighting technologies face challenges in achieving uniform and customizable light distribution, color mixing, and efficient use of phosphor materials, limiting their adaptability and aesthetic appeal in various lighting applications.
Innovation Solution
A lighting apparatus with a specific arrangement of LED chips and fluorescent layers, including interleaved patterns and adjustable driving currents, combined with phosphor materials like yellow-green and red phosphors, allows for precise control over light mixing and direction, enhancing flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single fluorescent layer is used to cover LED chips, then the structure is simple, but the light distribution uniformity and color mixing quality are insufficient
Solution Approach 1:
The patent divides the fluorescent layer into multiple segments (first fluorescent layer and second fluorescent layer) with different phosphor materials. The first fluorescent layer contains yellow-green phosphor covering first LED chips, while the second fluorescent layer contains red phosphor covering both first and second LED chips. This segmentation allows different regions to contribute different wavelengths, achieving uniform and high-quality light distribution without excessive structural complexity.
Solution Approach 2:
Different fluorescent layers are applied to different LED chip types with specific local properties. The first fluorescent layer (yellow-green phosphor) is specifically matched to first LED chips, while the second fluorescent layer (red phosphor) covers both chip types. This local quality approach ensures optimal light conversion efficiency and uniform color mixing in each region, resolving the contradiction between simplicity and light quality.
2Adaptability or versatility
If fixed driving currents are used for LED chips, then the control system is simple, but the color temperature adjustability is limited
Solution Approach 1:
The patent implements dynamic control by providing separate driving circuits for first and second LED chips, allowing independent adjustment of driving currents. The controller can dynamically vary the current ratios to achieve different color temperatures (e.g., warm white, neutral white, cool white). This dynamic capability enables color temperature adaptability without requiring a completely complex control system, as the adjustment is achieved through simple current ratio modulation.
Solution Approach 2:
The system changes the electrical parameter (driving current) to achieve optical parameter adjustment (color temperature). By varying the driving current ratio between first and second LED chips, the overall color temperature of the lighting apparatus can be adjusted across a wide range. This parameter change approach provides versatility while keeping the control system relatively simple.
3Use of energy by moving object
If phosphor materials are optimized for specific LED chips, then the light conversion efficiency is high, but the material cost and manufacturing complexity increase
Solution Approach 1:
The second fluorescent layer containing red phosphor serves a universal function by covering both first LED chips and second LED chips. This universal layer contributes to overall color mixing and efficiency across different chip types. The manufacturing process benefits from this universality as the same second fluorescent layer material can be applied to various LED chip configurations, reducing material cost and simplifying production while maintaining high light conversion 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 over 30% light overlap and adjustable color temperature, resulting in uniform and customizable lighting solutions with improved aesthetic appeal and reduced substrate and phosphor costs, suitable for diverse applications.
Implementation Method 1
a blue LED chip is typically coated with a phosphor layer that converts some of the emitted blue light into other colors
Implementation Method 2
combining blue light with red and green phosphors can produce warm white light
Data Source
AI summary
A lighting apparatus includes a base plate, multiple first type LED chips, multiple second type LED chips, a first fluorescent layer and a second fluorescent layer. The first fluorescent layer only covers the first type LED chips. The second fluorescent layer covers both the first type LED chips and the second type LED chips. The first type LED chips integrated with the first fluorescent layer emit a first light. The second type LED chips integrated with the first fluorescent layer and the second fluorescent layer emit a second light. The first light and the second light have more than 30% overlapping.