LED Package Absorbing Structure for Light Efficiency
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Solution Overview
Problem
The existing LED packages for sensing devices face challenges with large size and reduced light efficiency, which limits their application in small-sized devices, and environmental light interference affects the accuracy of object detection.
Innovation Solution
An LED package design incorporating a reflective structure and an absorbing structure, where the absorbing structure encloses or is placed on the reflective structure, absorbing secondary light and environmental light to enhance light efficiency and reduce interference, while maintaining minimal contact with the LED chip to preserve brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the absorbing material is covered to the LED package to reduce environmental light, then the light efficiency of the LED package is decreased, but the environmental light interference is reduced
Solution Approach 1:
The patent divides the light management function into two separate structures: a reflective structure that directs primary light forward and an absorbing structure that selectively absorbs secondary light and environmental light. This segmentation allows each structure to perform its specific function without interfering with the other, resolving the contradiction between reducing environmental light interference and maintaining light efficiency
Solution Approach 2:
The absorbing structure is strategically positioned to enclose or be placed on specific portions of the reflective structure where secondary light and environmental light interfere, rather than covering the entire LED package. This localized approach reduces environmental light interference while preserving the light efficiency in the primary emission direction
2Volume of moving object
If the package size is reduced for small sensing device application, then the light efficiency and detection accuracy are affected
Solution Approach 1:
The absorbing structure is designed to enclose or be placed on the reflective structure, creating a nested configuration where the absorbing structure surrounds portions of the reflective structure. This nesting allows both structures to be integrated in a compact arrangement, reducing the overall package size while maintaining their light management functions for accurate detection
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning the absorbing structure to enclose or be placed on the reflective structure from multiple directions. This dimensional approach allows efficient light management within a compact volume, reducing package size while maintaining detection accuracy
3Object-affected harmful factors
If the absorbing structure contacts the LED chip to absorb secondary light, then the brightness of the LED package is reduced, but the secondary light interference is minimized
Solution Approach 1:
The patent extracts the light absorption function from direct contact with the LED chip and implements it through the absorbing structure that encloses or is placed on the reflective structure. This extraction allows secondary light to be absorbed after it reflects off the chip, minimizing interference while preserving the brightness of the primary light emission from the chip
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 improves the accuracy and light efficiency of the sensing device by minimizing interference and maintaining high brightness, enabling successful object detection in small-sized devices.
Implementation Method 1
a wavelength conversion structure placed on the LED chip
Implementation Method 2
the absorbing structure can absorb the light back to the wavelength conversion structure caused by the total internal reflection of the wavelength conversion structure, reflection or scattering inside the LED package
Implementation Method 3
a reflective structure which encloses the LED chip
Implementation Method 4
the absorbing structure can absorb the light back to the wavelength conversion structure caused by the total internal reflection of the wavelength conversion structure
Data Source
AI summary
A LED package comprises an LED chip, a reflective structure which encloses the LED chip, a wavelength conversion structure placed on the LED chip, and an absorbing structure which encloses or is placed on the reflective structure.