Display Lens Foundation Layer Stress Management
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Solution Overview
Problem
The existing display apparatuses with organic electroluminescent elements face issues of mechanical stress concentration, detachment, and cracking due to lenses being in contact with multiple materials, leading to adhesion and thermal stress differences.
Innovation Solution
A method involving the formation of a foundation layer between the light absorbing layer and the lens portion, which covers the region where the lens is formed, ensuring contact with both layers and reducing stress concentration, thereby preventing detachment and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lenses are formed in contact with both the light absorbing layer and the substrate, then light extraction efficiency is improved, but mechanical stress concentration occurs leading to detachment or cracking
Solution Approach 1:
A foundation layer is introduced as an intermediary component between the light absorbing layer and the lenses. This foundation layer serves as a mediator that provides uniform mechanical support to the lenses, preventing direct contact with the substrate and eliminating stress concentration at the interfaces between different materials. The foundation layer absorbs and distributes thermal and mechanical stresses uniformly, thereby preventing lens detachment and cracking while maintaining light extraction efficiency.
2Use of energy by moving object
If lenses contact multiple materials with different adhesion properties, then optical performance is enhanced, but adhesion differences cause stress concentration
Solution Approach 1:
The foundation layer is designed to provide homogeneous mechanical and thermal properties across the entire lens array. By forming the foundation layer as a uniform material layer before depositing the lenses, all lenses experience identical adhesion conditions and thermal expansion characteristics. This homogeneity eliminates the stress concentration that would otherwise occur at interfaces between lenses and different underlying materials (light absorbing layer vs. substrate), thereby maintaining strong adhesion and preventing cracking.
Data Source
AI summary
A method includes forming a light absorbing layer, and forming a foundation layer before forming a lens portion such that the foundation layer covers a region where the lens portion is to be formed, wherein the foundation layer is in contact with the light absorbing layer and the lens portion once the lens portion is formed.