Micro-LED Wavelength Conversion Grid for Resolution and Efficiency
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Solution Overview
Problem
Conventional methods for forming wavelength conversion layers in Micro-LED displays face challenges in balancing resolution and conversion efficiency, particularly due to severe scattering effects that limit resolution and require lower photoluminescent material concentration, which degrades absorption and conversion characteristics.
Innovation Solution
A method for manufacturing a display apparatus involves forming a grid layer with grid holes above the pixel points, followed by the formation of a wavelength conversion layer that fills part of the grid holes, converting the first-color light into a second-color light. This approach allows for improved thickness control and optical conversion efficiency of the wavelength conversion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of the wavelength conversion layer is increased to improve light conversion efficiency, then conversion efficiency is improved, but resolution deteriorates due to severe scattering effects
Solution Approach 1:
The invention divides the wavelength conversion layer into multiple stacked sub-layers (first wavelength conversion layer, second wavelength conversion layer, etc.), each with optimized thickness and photoluminescent material concentration. This segmentation allows each sub-layer to contribute to light conversion while maintaining resolution by limiting the thickness of individual scattering-prone layers.
Solution Approach 2:
Different sub-layers are assigned different photoluminescent material concentrations and thicknesses optimized for specific wavelength conversion tasks. For example, the first wavelength conversion layer may have higher concentration for efficient conversion, while subsequent layers have lower concentrations to reduce scattering and maintain resolution.
2Loss of energy
If the concentration of photoluminescent materials is increased to improve absorption and conversion characteristics, then conversion efficiency is improved, but resolution deteriorates due to enhanced scattering effects
Solution Approach 1:
The photoluminescent material concentration is segmented across multiple layers rather than uniformly distributed. The first wavelength conversion layer contains higher concentration materials for strong absorption, while subsequent layers contain lower concentration materials that contribute to conversion with minimal scattering, thus maintaining resolution.
Solution Approach 2:
Each wavelength conversion layer is locally optimized with specific photoluminescent material concentrations tailored to its position and function in the stack, allowing high conversion efficiency in regions where it is needed while maintaining low scattering in regions where resolution is critical.
3Ease of manufacture
If a single-layer wavelength conversion structure is used to simplify the manufacturing process, then ease of manufacture is improved, but control over thickness and conversion efficiency deteriorates
Solution Approach 1:
The wavelength conversion function is segmented into multiple manufacturable layers, each with controlled thickness and material composition. This segmentation enables precise control over the optical properties of each layer while maintaining compatibility with existing multi-layer manufacturing processes like spin-coating and photolithography.
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 proposed method enhances the light conversion efficiency and resolution of the wavelength conversion layer by allowing thicker and more controllable layer formation, improved adhesion, and increased process window, making it suitable for high-resolution and high-pixel-density displays.
Implementation Method 1
the wavelength conversion layer includes multiple first wavelength conversion units, which fill in at least part of the grid holes and convert the first-color light into a second-color light
Data Source
AI summary
A display apparatus and a method for manufacturing the same is disclosed according to the present application, which relates to the technical field of semiconductor apparatus. The method includes following steps: providing a display device, where the display device includes multiple pixel points arranged in an array, and the pixel points emit a first-color light; forming a grid layer above the pixel points, where the grid layer includes multiple grid holes arranged in an array, the grid holes are arranged relative to the pixel points, and the first-color light passes through the grid holes; forming a wavelength conversion layer above the grid layer, where the wavelength conversion layer includes multiple first wavelength conversion units, which fill in at least part of the grid holes and convert the first-color light into a second-color light.