LED Package Chromaticity Subregion Segmentation
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Solution Overview
Problem
Current LED packaging technologies face challenges in achieving uniform color and luminance, as existing binning methods often result in wasted LEDs and inefficient packaging due to strict chromaticity requirements, leading to limited color consistency and increased waste.
Innovation Solution
The method involves subdividing chromaticity regions into smaller subregions, selecting LEDs from these subregions to create a target chromaticity region that is a subset or touches the edge of a standard bin, allowing for the use of LEDs with chromaticity points outside the standard bin, thereby improving color consistency and reducing waste by enabling the use of a broader range of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strict chromaticity binning is used to ensure color uniformity, then color consistency is improved, but LED waste increases and packaging efficiency deteriorates
Solution Approach 1:
The chromaticity space is segmented into multiple subregions within a standard bin, allowing LEDs from different subregions to be combined. This segmentation enables more flexible grouping of LEDs that would traditionally be discarded, thereby reducing waste while maintaining color consistency through controlled combination of multiple subregion LEDs.
2Ease of manufacture
If standard binning methods are used, then packaging simplicity is maintained, but color uniformity and packaging efficiency are compromised
Solution Approach 1:
The invention changes the chromaticity parameters of individual LEDs by combining LEDs from different subregions with varying chromaticity coordinates. Through mathematical combination of multiple LEDs' chromaticity parameters, the overall package achieves superior color uniformity that exceeds what can be obtained from single-bin selection alone.
3Productivity
If LEDs from a broader chromaticity range are used, then packaging efficiency and waste reduction are improved, but color consistency deteriorates
Solution Approach 1:
The invention creates a composite light source by combining multiple LEDs with different chromaticity characteristics within a single package. This composite approach allows the use of LEDs from a broader chromaticity range while maintaining color consistency, as the combined output of multiple LEDs with varying parameters produces a unified, consistent color profile.
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3A~3B
AI summary
Methods of forming a light emitting device package assembly include defining a chromaticity region in a two dimensional chromaticity space, and subdividing the defined chromaticity region into at least three chromaticity subregions, providing a plurality of light emitting devices that emit light having a chromaticity that falls within at least one of the defined chromaticity subregions, selecting at least three of the plurality of light emitting devices, each of the three light emitting devices emits light from a different one of the chromaticity subregions, and mounting the selected light emitting devices on a light emitting device package body.