UV-Curable Protective Layer for Micro-LED Durability and Image Quality
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Solution Overview
Problem
Micro-LED displays are prone to damage from heat, moisture, and physical impact due to their miniaturization, leading to reduced durability and image quality degradation.
Innovation Solution
A UV-curable protective material composition comprising an oligomer with a hydrogenated polybutadiene or polyisobutylene backbone and di-functional acrylate groups, an acrylate monomer, and a photoinitiator, with specific Young's modulus and tack force properties, forms a protective layer that enhances durability and maintains image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is added to protect LEDs from heat, moisture, and physical impact, then durability and reliability are improved, but image quality may deteriorate due to optical interference
Solution Approach 1:
The patent applies parameter changes by carefully controlling the Young's modulus (100-2000 MPa) and tack force (<20 gf) of the protective layer material to achieve optimal balance between protection and optical performance. These specific parameter ranges ensure the layer is durable yet optically transparent
Solution Approach 2:
The protective layer uses composite material composition including oligomer with hydrogenated polybutadiene or polyisobutylene backbone and di-functional acrylate groups, combined with acrylate monomer and photoinitiator. This composite formulation provides both mechanical durability and optical clarity
2Manufacturing precision
If the LED size is miniaturized to increase pixel density, then resolution is improved, but the attachment area is reduced making LEDs more prone to detachment
Solution Approach 1:
The patent employs a thin film protective layer that provides mechanical support and protection to miniaturized LEDs. The flexible yet durable film compensates for the reduced attachment area by distributing mechanical stresses across a larger surface area
Solution Approach 2:
The protective layer serves as a preventive cushioning structure that protects miniaturized LEDs from external impacts before damage can occur. The layer absorbs and distributes mechanical stresses, preventing detachment of the small LEDs from the substrate
3Strength
If a protective layer is applied to protect against external impacts, then physical durability is improved, but the surface may become tacky causing contamination and image quality loss
Solution Approach 1:
The patent precisely controls the tack force parameter to be less than 20 gf after UV curing, which eliminates surface stickiness and contamination issues while maintaining the protective layer's impact resistance through optimized material composition and crosslinking density
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 protective layer prevents LED damage, maintains luminous performance, and ensures long-term stability against external impacts and moisture, while minimizing image quality loss.
Implementation Method 1
an ultraviolet-curable protective material composition for forming a protective layer of a micro-LED display comprising: an oligomer with at least one hydrogenated polybutadiene or polyisobutylene backbone and di-functional acrylate groups; an acrylate monomer; a photoinitiator
Data Source
AI summary
The present disclosure relates to an ultraviolet-curable protective material composition comprising an oligomer having at least one backbone selected from hydrogenated polybutadiene and polyisobutylene, and having di-functional acrylate groups; an acrylate monomer, and a photoinitiator, wherein the composition has a Young's modulus of 100 MPa to 2,000 MPa at 25° C. and a tack force of less than 20 gf after UV curing.