Side-Emission LED With Triangular Element Spacing
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Solution Overview
Problem
Existing side-emission light emitting devices face challenges in achieving effective color mixing due to the close proximity of light emitting elements, which leads to absorption of emitted light and reduced light extraction efficiency.
Innovation Solution
A side-emission light emitting device is designed with three light emitting elements of different colors arranged in an isosceles triangle configuration, where the distance between the base elements is one to two times the length of the apex element, housed in a package with lead frames and resin molding for individual driving and improved heat dissipation, allowing for efficient color mixing and light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light emitting elements are placed close together to achieve compact device size, then device compactness is improved, but light extraction efficiency deteriorates due to absorption of emitted light
Solution Approach 1:
The patent employs asymmetric arrangement of light emitting elements in a specific triangular pattern with defined side length ratios, where the distance between elements is optimized to prevent absorption while maintaining compact form factor. This asymmetric geometric configuration resolves the contradiction by creating optimal light propagation paths.
Solution Approach 2:
The patent optimizes the distance parameter between light emitting elements, setting it to one to two times the element size. This parameter optimization ensures that elements are close enough for compactness but far enough to avoid light absorption, directly resolving the technical contradiction.
2Adaptability or versatility
If multiple light emitting elements of different colors are combined to achieve color mixing, then emission color variety is improved, but light absorption between elements increases reducing overall efficiency
Solution Approach 1:
The patent uses asymmetric triangular arrangement of multi-color light emitting elements with specific side length ratios. This asymmetric configuration optimizes the spatial relationships between different color elements, allowing color mixing while minimizing absorption losses through optimized light propagation paths.
Solution Approach 2:
The patent transitions from linear or planar arrangements to a three-dimensional triangular configuration with specific height and base relationships. This dimensional approach allows elements to be positioned in space to achieve both color mixing and reduced absorption by utilizing spatial separation in multiple dimensions.
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 enhances both single-color and mixed-color light extraction by minimizing absorption and optimizing light reflection, resulting in improved light emitting device performance.
Implementation Method 1
three light emitting elements with different emission colors
Implementation Method 2
optimizing light reflection, resulting in improved light emitting device performance
Implementation Method 3
a resin molding formed integrally with the plurality of lead frames and including an opening in a surface of the resin molding
Data Source
AI summary
A light emitting device, includes: three light emitting elements with different emission colors; and a package including a plurality of lead frames to individually drive the three light emitting elements, and a resin molding formed integrally with the plurality of lead frames and including an opening in a surface of the resin molding to house the light emitting elements, a portion of each of the plurality of lead frames being exposed on a bottom surface of the opening, and another portion of each of the plurality of lead frames being exposed on an outer surface of the resin molding, the three light emitting elements being disposed on one of the lead frames exposed on the bottom surface of the opening and arranged so as to form an isosceles triangle with a bottom angle of 30 to 60 degrees, and a distance between two of the light emitting elements located on a base of the isosceles triangle is one to two times a length of a side of the light emitting element located at an apex of the isosceles triangle.