Micro Pixel Encapsulation for QD Light Extraction and Stability
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Solution Overview
Problem
Integration of micro devices into display substrates faces challenges due to differing performance and material sensitivity to environmental agents like oxygen and water, necessitating protection and improved light extraction efficiencies.
Innovation Solution
The implementation of a pixel structure with a light source, color conversion layer, and light distribution structure, including encapsulation capsules to protect color conversion materials and attenuators to manage light intensity, along with reflective and planarization layers to enhance light distribution and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If color conversion layers are integrated with micro devices to improve light extraction efficiency, then system performance is enhanced, but the sensitive materials become vulnerable to environmental agents like oxygen and water
Solution Approach 1:
The encapsulation structure is divided into multiple functional layers including a first encapsulation layer directly protecting the color conversion layer, a second encapsulation layer providing additional protection, and a barrier layer blocking environmental agents. This segmented approach allows each layer to specialize in specific protective functions while maintaining overall material stability and light extraction performance
Solution Approach 2:
The encapsulation layers act as intermediary structures between the sensitive color conversion materials and the external environment. These intermediate layers (first encapsulation layer, second encapsulation layer, and barrier layer) mediate the interaction by blocking oxygen and water while allowing light to pass through, thus protecting the materials without compromising light extraction efficiency
2Illumination intensity
If high intensity light is used to improve light output, then brightness is enhanced, but high stress points are created in the light conversion layer causing degradation
Solution Approach 1:
The first encapsulation layer and second encapsulation layer are positioned beforehand to cushion and distribute the mechanical stress caused by high intensity light in the light conversion layer. This pre-positioned protective structure prevents stress concentration that would otherwise lead to layer degradation, allowing sustained high brightness operation without compromising structural integrity
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 effectively protects sensitive materials from environmental agents and improves light extraction efficiencies by distributing light uniformly across the pixel area, reducing hotspots and enhancing overall system performance.
Implementation Method 1
a light source to generate light
Implementation Method 2
a light conversion layer to convert the light to a desired color
Implementation Method 3
a top reflector mounted on the color conversion layer and extended over the top of the area of the micro device to reflect the light back toward and through the color conversion layer
Data Source
AI summary
The disclosure is related to creating different functional micro devices by integrating functional tuning materials and creating an encapsulation capsule to protect these materials. Various embodiments of the present disclosure also related to improve light extraction efficiencies of micro devices by mounting micro devices at a proximity of a corner of a pixel active area and arranging QD films with optical layers in a micro device structure.