Fluorescent Element Shaping for Uniform LED Color Conversion
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Solution Overview
Problem
Conventional LED lamp devices with fluorescent elements exhibit color unevenness due to varying light path lengths, leading to inconsistent blue and yellow light ratios, and suffer from reduced luminous efficiency due to air gaps between LED elements and fluorescent materials.
Innovation Solution
The LED lamp device features a fluorescent element with inclined surfaces and grooved sections that cover all surfaces of the LED elements without gaps, ensuring uniform light path lengths and minimizing air loss, thereby maintaining consistent blue and yellow light ratios and enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fluorescent element is formed with uniform thickness to simplify manufacturing, then manufacturing precision is improved, but color uniformity deteriorates due to varying light path lengths
Solution Approach 1:
The fluorescent element employs varying thickness at different locations to optimize light conversion. The thickness is greater at peripheral regions where light path length is longer, and thinner at central regions where light path length is shorter, thereby achieving uniform color output across the entire surface despite the complexity of non-uniform manufacturing
Solution Approach 2:
The invention changes the physical parameter of fluorescent element thickness from a constant value to a spatially varying value. This parameter modification compensates for the varying light path lengths at different locations, ensuring that the product of thickness and light path length remains substantially constant throughout, thus achieving uniform color conversion
2Ease of manufacture
If air gaps are maintained between LED elements and fluorescent material for ease of assembly, then ease of manufacture is improved, but luminous efficiency deteriorates due to light loss at interfaces
Solution Approach 1:
The fluorescent element is designed to be in direct contact with the LED elements, eliminating air gaps between the light-emitting surfaces. This merging of the LED elements and fluorescent element removes the air interface that causes light reflection and loss, thereby improving luminous efficiency while maintaining ease of manufacture through integrated construction
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
This configuration achieves uniform color output and improved luminous efficiency by ensuring consistent light conversion and minimizing light loss, addressing color unevenness and enhancing the overall performance of the LED lamp device.
Implementation Method 1
a fluorescent element effective to convert blue light radiated from the blue LED into yellow light
Data Source
AI summary
An LED lamp device includes a plurality of LED elements separately mounted on a substrate and effective to emit light having a first wavelength. A fluorescent element includes a fluorescent material excitable by light emitted from the LED elements to emit light of a second wavelength, and is arranged to cover each LED element with no gaps provided between the fluorescent element and the substrate. The fluorescent element is shaped in accordance with the positioning of the LED elements and the spaces defined there-between such that a proportion of light of the first wavelength with respect to light of the second wavelength is substantially uniform irrespective of light exit direction.