Display Protective Layer Modulus for Moisture Sealing Without Peeling
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Solution Overview
Problem
Existing electronic devices with display panels face issues with moisture and air intrusion, as well as thermal expansion coefficient differences leading to peeling or damage of the protective layer, which affects the performance and reliability of light-emitting units.
Innovation Solution
An electronic device with a protective layer having a Young's modulus of less than or equal to 20 MPa, which covers the light-emitting units and is designed to mitigate moisture and air intrusion, and optionally includes wavelength conversion particles or reflective structures to enhance performance and simplify manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective layer with high Young's modulus is used, then the protective strength is improved, but the risk of peeling due to thermal expansion coefficient difference increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Young's modulus of the protective layer to be ≤20 MPa, which is a specific quantitative parameter. This parameter optimization resolves the contradiction by selecting a moderate elasticity range that provides sufficient protection while maintaining thermal expansion compatibility with the substrate and light-emitting units, thereby preventing peeling.
Solution Approach 2:
The patent employs composite materials by formulating the protective layer with specific compositions including polymers, oligomers, and additives that achieve the target Young's modulus ≤20 MPa. The composite formulation allows tuning of both mechanical strength and thermal expansion properties simultaneously, resolving the contradiction between protective strength and peeling resistance.
2Object-affected harmful factors
If the protective layer is made more rigid, then the protection against moisture and air intrusion is improved, but the thermal stability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the Young's modulus parameter to ≤20 MPa, which balances the protective barrier function against moisture and air intrusion with thermal expansion compatibility. This parameter control ensures the protective layer remains sufficiently compliant under thermal stress while maintaining effective sealing properties.
Solution Approach 2:
The patent applies local quality by designing the protective layer with specific regional properties - the Young's modulus is controlled to be ≤20 MPa in the protective layer itself, while the underlying substrate and encapsulation structures may have different mechanical properties. This localized property optimization allows the protective layer to provide moisture barrier function without compromising overall thermal stability.
3Reliability
If a softer protective layer is used, then the thermal expansion compatibility is improved, but the protective capability deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing a specific upper limit for Young's modulus (≤20 MPa) rather than using extreme soft or hard materials. This optimized parameter range ensures the protective layer is soft enough to match thermal expansion with underlying structures (preventing peeling) while maintaining sufficient protective capability against moisture and air intrusion.
Data Source
AI summary
An electronic device is provided. The electronic device includes a driving substrate, a plurality of light-emitting units, and a protective layer. The light-emitting units are electrically connected to the driving substrate. The protective layer covers the light-emitting units, and the protective layer has a Young's modulus less than or equal to 20 MPa.