LED Package with Segmented Luminescent Layers for Color Uniformity
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Solution Overview
Problem
Existing light emitting diode packages with multiple luminescent conversion elements face issues of color non-uniformity and reduced color rendering due to differing excitation efficiencies when excited by a single light source, leading to inconsistent light emission across various wavelengths.
Innovation Solution
A light emitting diode package design featuring two separate luminescent conversion layers, where the first layer surrounds the base of the chip to avoid direct excitation and the second layer is excited through a transparent colloid, ensuring equal light intensity and enhanced color rendering by utilizing a green luminescent conversion element and a red luminescent conversion element with varying excitation efficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple luminescent conversion elements are assembled in one package at the same time and excited by one light source, then the device can emit light with multiple wavelengths, but the luminescent conversion elements adversely influence each other leading to lack of color uniformity and reduced ability to render colors
Solution Approach 1:
The patent divides the single package into multiple separate packages, each containing only one luminescent conversion element. This segmentation eliminates the mutual interference between different luminescent conversion elements while maintaining the ability to emit multiple wavelengths by combining the outputs of separate packages.
Solution Approach 2:
The patent introduces a reflective member as an intermediary component to redirect and combine the light outputs from multiple separate luminescent conversion elements. This reflective mediator enables the integration of multiple wavelengths while preventing direct adverse interaction between the luminescent elements.
2Adaptability or versatility
If various luminescent conversion elements are excited simultaneously by one light source, then the device can produce multi-color light, but the excitation efficiencies differ leading to reduced ability to render colors
Solution Approach 1:
By separating the luminescent conversion elements into individual packages with dedicated light sources, each element operates independently with optimized excitation conditions. This ensures consistent and reliable color output from each element without being affected by the varying excitation efficiencies of other elements.
Solution Approach 2:
Each separate package is designed with local optimization for its specific luminescent conversion element, including tailored light source positioning and optical characteristics. This local quality approach ensures that each element operates at its optimal excitation efficiency, improving overall color consistency and rendering ability.
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 design achieves uniform emission of blue, green, and red light with improved color rendering capabilities by optimizing the excitation efficiency of luminescent conversion elements, ensuring consistent color output.
Implementation Method 1
a first luminescent conversion layer 162 and a second luminescent conversion layer 164, both of which cover the light emitting diode chip 18
Data Source
AI summary
A light emitting diode package comprises a light emitting diode chip, a first luminescent conversion layer and a separate second luminescent conversion layer on the first luminescent conversion layer. The first luminescent conversion layer has a first luminescent conversion element surrounding the light emitting diode chip. The second luminescent conversion layer has a second luminescent conversion element located above the light emitting diode chip. An excitation efficiency of the first luminescent conversion element is higher than that of the second luminescent conversion element.