Color-Mixing LED Module Reducing Phosphor Absorption Loss
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Solution Overview
Problem
Current LED technology suffers from inferior color rendering and brightness due to the absorption of red light by green fluorescent powder, leading to attenuated intensity and hue in white light sources.
Innovation Solution
A color-mixing LED module is designed with a first red light-emitting chip and multiple second light-emitting chips emitting blue light, with red and yellow fluorescent powders in the sealing glue to mix red and white light, maintaining intensity and hue, and enhancing color rendering and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phosphor is used to convert blue or ultraviolet light to white light, then a single LED can emit white light, but energy is lost as heat during wavelength conversion, reducing efficiency
Solution Approach 1:
The patent segments the white light generation into multiple pathways: blue LED excites green fluorescent powder to produce white light, while red LED provides additional red component. This reduces reliance on single phosphor conversion, minimizing energy loss while achieving white light emission.
Solution Approach 2:
The patent applies different light-emitting characteristics to different regions: red LED chips provide red light component while blue LED chips with green fluorescent powder provide white light component. This local differentiation optimizes energy efficiency in each region while achieving overall white light output with good color rendering.
2Area of stationary object
If red light-emitting chip is placed adjacent to green fluorescent powder, then the structure is compact, but the red light is absorbed and sheltered by green powder, leading to attenuated intensity and hue
Solution Approach 1:
The patent segments the light-emitting chips and fluorescent powder into distinct, separated regions rather than direct contact. The red LED chips are positioned to emit red light without adjacent green fluorescent powder that would absorb it, while maintaining compact overall structure through optimized spatial arrangement.
Solution Approach 2:
The patent introduces transparent encapsulants and reflective structures as intermediaries between red LED chips and green fluorescent powder. These intermediaries prevent direct absorption of red light by green powder while maintaining compact integration, allowing red light to pass through unaffected.
3Ease of manufacture
If conventional white LED structure is used, then manufacturing is simple, but color rendering is inferior and does not closely match natural sunlight colors
Solution Approach 1:
The patent uses composite light-emitting structures combining red LED chips and white LED chips with green fluorescent powder. This composite approach maintains manufacturing simplicity through standardized components while significantly improving color rendering by providing both red and white light components that closely match natural sunlight spectrum.
Solution Approach 2:
The patent applies different light-emitting characteristics to different regions: red LED chips provide red light component while blue LED chips with green fluorescent powder provide white light component. This local differentiation enhances color rendering quality while maintaining ease of manufacture through modular design.
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 module produces a mixed light with high color rendering and brightness, ensuring objects are illuminated with colors closest to their original appearance, improving upon the limitations of prior art by preventing red light attenuation.
Implementation Method 1
a first light-emitting chip (30) bonded in the first accommodating space (220) and emitting red light with a wavelength between 590nm and 700nm
Implementation Method 2
a plurality of second light-emitting chips (40) disposed on one side of the first light-emitting chip (30) and bonded in the plurality of second accommodating spaces (230), wherein a piece of second sealing glue (410) covers the light-emitting paths of the plurality of second light-emitting chips (40) and contains red fluorescent powder and yellow fluorescent powder
Implementation Method 3
by using phosphor, a portion or all of the light is converted to the light containing green and red light, which have longer wavelengths in spectrum
Implementation Method 4
after short-wavelengths photons (blue, violet, and ultraviolet light) are absorbed by electrons in the fluorescent material, the electrons are excited to a high-energy-level and unstable excited state. Afterwards, when the electrons return to the original levels, a part of the energy is dissipated in the form of heat, while the rest is released in the form of photons
Implementation Method 5
red and yellow fluorescent powders in the sealing glue to mix red and white light, maintaining intensity and hue, and enhancing color rendering and brightness
Data Source
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AI summary
The present invention provides a color-mixing light-emitting diode module. According to the present invention, a first light-emitting chip and two second light-emitting chips are disposed on a holder. The first light-emitting chip emits red light and the plurality of second light-emitting chips emit white light. The red light and the white light are mixed, giving mixed light with high color rendering and brightness. Objects illuminated by the mixed light will exhibit colors closest to their original colors as perceived by eyes. Furthermore, by arranging the first and second light-emitting chips in matrix, the color rendering of the light-emitting diode module can be adjusted and improved.