Microdevice Color Conversion Encapsulation Against Oxygen and Water
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Micro devices integrated into display substrates are sensitive to environmental agents like oxygen and water, affecting system performance, and there is a need to protect these materials.
Innovation Solution
An encapsulation capsule is provided to protect color conversion layers, and light distribution structures are used to distribute light effectively while reducing high-intensity hotspots, incorporating attenuators or reflective layers to manage light intensity and enhance light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro devices are integrated into display substrates to enhance system performance, then productivity and functionality are improved, but the devices become sensitive to environmental agents like oxygen and water, worsening reliability
Solution Approach 1:
The patent applies encapsulation layers (thin films) to protect color conversion materials from environmental agents. Specifically, encapsulation layers are deposited over the color conversion layer to form a protective barrier that prevents oxygen and water from reaching the sensitive materials, thereby maintaining reliability while preserving the integrated display structure's performance
Solution Approach 2:
The patent creates an inert environment by depositing encapsulation layers that form a sealed barrier around the color conversion materials. This encapsulation structure effectively replaces the harmful external environment (oxygen and water exposure) with an inert protected atmosphere, preventing chemical degradation of the materials
2Illumination intensity
If light intensity is increased to improve brightness, then illumination intensity is improved, but high-intensity hotspots cause stress and degradation to the light conversion layer, worsening durability
Solution Approach 1:
The patent applies local quality by using a light distribution structure with different optical properties in different regions. The structure includes a first region with higher refractive index and a second region with lower refractive index, creating localized variations in light propagation that distribute intensity evenly across the color conversion layer, preventing hotspot formation while maintaining overall brightness
Solution Approach 2:
The patent introduces a light distribution structure as an intermediary between the light source and the color conversion layer. This intermediary structure manages and redistributes the light intensity, converting concentrated high-intensity light into evenly distributed lower-intensity light that reaches the color conversion layer uniformly, thereby preventing stress concentration
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 encapsulation capsule and light management structures improve the durability and efficiency of micro devices by shielding them from environmental agents and optimizing light distribution, enhancing system performance.
Implementation Method 1
a light conversion layer to convert the light to a desired color
Implementation Method 2
a light distribution structure to distribute the light from the light source onto the conversion layer
Implementation Method 3
the light distributor is comprised of reflective layers and a planarization 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.