Micro-LED Color Conversion Filters for Higher Color Purity
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Solution Overview
Problem
Micro-LED display devices face challenges in achieving full light conversion efficiency and color purity due to incomplete conversion of light from micro-light-emitting diodes, resulting in poor light conversion efficiency and insufficient color purity of outgoing light.
Innovation Solution
The display device incorporates a light-emitting substrate, a counter substrate, multiple color conversion layers, a low-refractive-index layer, and patterned Fabry-Perot filter layers with through-holes, reflective layers made of silver, and a spacer layer of silicon oxide, where the patterned Fabry-Perot filter layers are designed to transmit converted light while reflecting unconverted light back to improve efficiency and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color conversion material is disposed on a micro-light-emitting diode to convert light color, then the light color can be changed, but the light conversion efficiency is poor and color purity is insufficient
Solution Approach 1:
The patent divides the color conversion function into multiple separate color conversion layers, each containing color conversion materials with different excitation characteristics. This segmentation allows each layer to specialize in converting specific wavelength ranges, improving both conversion efficiency and color purity compared to a single mixed-material layer.
Solution Approach 2:
Different color conversion materials are placed in different spatial locations and layers, each optimized for specific wavelength conversions. The first color conversion layer contains materials optimized for certain wavelengths while the second layer contains materials for other wavelengths, creating local optimization of conversion properties.
2Loss of energy
If patterned Fabry-Perot filter layers are added to transmit converted light and reflect unconverted light, then light conversion efficiency and color purity improve, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the patterned Fabry-Perot filter layers: they serve as both optical filters for wavelength selection and as structural elements with through-holes for light transmission. The reflective layers and spacer layers are integrated into a single patterned structure that performs multiple optical functions simultaneously.
Solution Approach 2:
The patterned Fabry-Perot filter layers perform multiple functions: they transmit converted light wavelengths, reflect unconverted light back to the color conversion layers for re-processing, and maintain the structural integrity of the device. This multi-functionality reduces the need for separate components.
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 light conversion efficiency and color purity of the outgoing light by effectively transmitting converted light and reflecting unconverted light back for re-processing, thereby improving the overall performance of the display device.
Implementation Method 1
patterned Fabry-Perot filter layers are disposed between the low-refractive-index layer and the color conversion layers. Each of the patterned Fabry-Perot filter layers has multiple through-holes and includes two reflective layers and a spacer layer between the two reflective layers
Implementation Method 2
The material of the two reflective layers includes silver
Implementation Method 3
The color conversion layers are disposed between the light-emitting substrate and the counter substrate... multiple first color conversion layers and multiple second color conversion layers, which are used to convert the light into a first colored light and a second colored light, respectively
Data Source
AI summary
A display device includes a light-emitting substrate, a counter substrate, multiple color conversion layers, a low-refractive-index layer, and multiple patterned Fabry-Perot filter layers. The light-emitting substrate is used to emit a light. The counter substrate is disposed opposite to the light-emitting substrate. The color conversion layers are disposed between the light-emitting substrate and the counter substrate. The low-refractive-index layer is disposed between the counter substrate and the color conversion layers. The refractive index of the low-refractive-index layer is less than or equal to that of the color conversion layers. The patterned Fabry-Perot filter layers are disposed between the low-refractive-index layer and the color conversion layers. Each of the patterned Fabry-Perot filter layers has multiple through-holes and includes two reflective layers and a spacer layer between the two reflective layers. The material of the two reflective layers includes silver, and the material of the spacer layer includes silicon oxide.