Rectangular LED Substrate Asymmetric Mounting for Color Mixing
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Solution Overview
Problem
LED light emitting devices with isosceles triangle arrangements of red, green, and blue LED elements suffer from insufficient color mixing properties, resulting in prominent violet and green bands around white light emission.
Innovation Solution
An LED light emitting device with a rectangular substrate where the first and second LED elements (red and green) are positioned symmetrically along the long-side and the third LED element (blue) is positioned symmetrically along the short-side, ensuring balanced light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED elements are arranged in an isosceles triangle configuration, then the device structure is simplified and manufacturing is easier, but color mixing properties deteriorate with prominent violet and green bands appearing
Solution Approach 1:
The patent applies asymmetry by changing from an isosceles triangle arrangement to a rectangular arrangement where the three LED elements (red, green, blue) are positioned at different distances from the corners of the substrate. Specifically, the red LED is positioned at a first distance from a first corner, the green LED at a second distance from a second corner, and the blue LED at a third distance from a third corner, creating an asymmetric distribution that optimizes color mixing while maintaining manufacturing simplicity
2Manufacturing precision
If LED elements are arranged to achieve good color mixing, then color mixing property is improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by optimizing the positioning of each LED element individually based on its specific color characteristics. Each LED (red, green, blue) is positioned at a specific distance from a specific corner of the rectangular substrate, allowing each element to contribute optimally to the overall color mixing while maintaining a simple rectangular overall structure that does not increase device complexity
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 color mixing properties, producing a larger white region with reduced violet and green bands, resulting in improved light emission quality.
Implementation Method 1
LED elements, which are semiconductor elements having long lifetime and excellent drivability, have been widely used
Implementation Method 2
LED light emitting devices of additive color mixing type which emit white light by enforcing concurrent light emission from LED elements for respective three colors; red (R), green (G) and blue (B)
Data Source
AI summary
An LED light emitting device with good color mixing property is provided. The LED light emitting device including a rectangular substrate having a short-side and a long-side and a first LED element, a second LED element and a third LED element that are mounted on a surface of the substrate and emit light with wavelengths different from one another, wherein the first LED element and the second LED element are mounted on the substrate so that a first distance from the short-side to a mounting position of the first LED element in the long-side direction of the substrate and a second distance from the short-side to a mounting position of the second LED element in the long-side direction are the same.