Stacked Wavelength Converter Layout for Micro LED Color Purity
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Solution Overview
Problem
Micro LED displays face challenges in forming and arranging fine wavelength conversion regions corresponding to each light emitting diode due to the small size and narrow spacing of the diodes, making it difficult to accurately position wavelength conversion materials.
Innovation Solution
A light emitting module with a substrate, light emitting devices, and a wavelength converter comprising multiple layers with spaced-apart wavelength conversion portions and a partition structure, allowing for precise arrangement and separation of red, green, and blue wavelength conversion regions, enhancing light purity and reducing color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of light emitting diodes is reduced to achieve micro LED display, then the display resolution is improved, but it becomes difficult to form fine wavelength conversion regions and arrange them at required locations
Solution Approach 1:
The patent transitions from a planar arrangement of wavelength conversion regions to a three-dimensional stacked structure. Multiple wavelength conversion layers are arranged vertically above each light emitting diode, allowing fine wavelength conversion regions to be formed at different heights while maintaining precise lateral positioning. This vertical stacking enables the formation of multiple color conversion regions (red, green, blue phosphors) without requiring extremely narrow lateral spacing.
Solution Approach 2:
The wavelength conversion function is segmented into multiple independent layers, each containing specific phosphors for different color conversions. The first wavelength conversion layer contains red and green phosphors, while the second wavelength conversion layer contains blue phosphor. This segmentation allows each layer to be optimized independently for its specific conversion function, improving manufacturing precision for each wavelength conversion region.
2Productivity
If the interval between light emitting diodes is reduced to increase pixel density, then the display quality is improved, but it becomes difficult to arrange wavelength conversion regions at required locations
Solution Approach 1:
By utilizing the vertical dimension through stacked wavelength conversion layers, the patent enables precise arrangement of wavelength conversion regions even when horizontal spacing between LEDs is reduced. The vertical stacking provides additional space for accommodating multiple phosphor types without requiring increased lateral distance between adjacent LEDs, thus maintaining high pixel density while facilitating manufacturing.
Solution Approach 2:
Multiple wavelength conversion layers are nested vertically above each light emitting diode, with the first wavelength conversion layer positioned above the LED and the second wavelength conversion layer positioned above the first layer. This nested arrangement allows compact packaging of multiple color conversion functions within a small horizontal footprint, enabling high pixel density while maintaining ease of manufacture through standardized layer stacking.
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 solution enables efficient wavelength conversion and improved light purity by preventing color mixing, simplifying the transfer process of light emitting devices, and securing process margins for wavelength conversion portions.
Implementation Method 1
a wavelength converter configured to convert light of the first wavelength emitted from the light emitting devices into light of another wavelength
Implementation Method 2
a first layer including a light absorption layer and a first wavelength conversion portion, and a second layer including a light absorption layer and a second wavelength conversion portion
Data Source
AI summary
A light emitting module including a substrate, a plurality of light emitting devices disposed on the substrate and configured to emit light of a first wavelength, a partition structure formed between the light emitting devices, and a wavelength converter configured to convert light of the first wavelength emitted from the light emitting devices into light of another wavelength, the wavelength converter including a first layer including a light absorption layer and a first wavelength conversion portion and a second layer including a light absorption layer and a second wavelength conversion portion, in which the first wavelength conversion portion in the first layer is laterally spaced apart from the second wavelength conversion portion in the second layer in plan view.