Dual-Layer Resin Structure for Flexible Display Moisture Protection
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Solution Overview
Problem
Flexible display devices, such as organic electroluminescent (EL) displays, often experience lighting failures when bent due to moisture ingress and structural stress, leading to defects in the wiring lines and OLEDs.
Innovation Solution
A display device with a resin-based base material featuring a dual-layer resin structure in the bent region, where the second resin layer has lower hydrophilicity than the first, is used to suppress moisture entry and prevent lighting failures by covering the wiring lines and exposed edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is bent to achieve a flexible display, then flexibility and adaptability are improved, but lighting failure occurs due to moisture ingress and structural stress
Solution Approach 1:
The patent employs a flexible base material and thin film structure that allows the display panel to be bent without causing lighting failure. The flexible base material provides the necessary adaptability while the thin film encapsulation protects the internal components from moisture ingress during bending, thus maintaining reliability.
Solution Approach 2:
The patent uses a composite structure consisting of multiple layers including a flexible base material, functional layers, and a resin layer with specific hydrophobicity. This composite material structure combines the flexibility of the base material with the protective properties of the resin layer, resolving the contradiction between flexibility and reliability.
2Ease of manufacture
If a single-layer resin structure is used, then manufacturing simplicity is maintained, but moisture protection is insufficient in bent regions
Solution Approach 1:
The patent applies a dual-layer resin structure specifically in the bent region (second region) while using a single-layer structure in the flat display region (first region). This local differentiation provides enhanced moisture protection where needed (in the bent region) while maintaining manufacturing simplicity in areas where it is sufficient (flat region).
Solution Approach 2:
The resin layer is segmented into two distinct regions: a first region corresponding to the flat display area and a second region corresponding to the bent area. This segmentation allows each region to have optimized properties - the second region has enhanced moisture barrier properties through the dual-layer structure, while the overall manufacturing process remains relatively simple.
3Object-affected harmful factors
If the resin layer is made more hydrophobic to prevent moisture ingress, then moisture protection is improved, but adhesion to the base material may be compromised
Solution Approach 1:
The patent creates different resin layers with different hydrophobicity levels at different locations. The resin layer in contact with the base material maintains good adhesion, while the exposed resin layer in the bent region has higher hydrophobicity to prevent moisture ingress. This local differentiation resolves the contradiction between adhesion and moisture protection.
Solution Approach 2:
The dual-layer resin structure functions as a composite material system where one layer provides adhesion to the base material while the other layer provides hydrophobic moisture protection. This composite approach allows both adhesion strength and moisture barrier properties to be optimized simultaneously.
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 dual-layer resin structure effectively prevents moisture ingress, thereby reducing the risk of lighting failures and maintaining the integrity of the wiring lines and OLEDs even when the display panel is bent.
Implementation Method 1
a first resin layer and a second resin layer whose hydrophilicity is lower than that of the first resin layer, in this order from the base material side
Data Source
AI summary
A display device according to an embodiment of the present invention includes a base material containing resin and including a display region and a bent region, the display region including a plurality of pixels; and a resin layer disposed on one side of the base material. An exposed section where a surface of the resin layer on a side opposite to a side on which the base material is disposed is exposed is formed in at least the bent region, and the resin layer includes, in the exposed section, a first resin layer and a second resin layer whose hydrophilicity is lower than that of the first resin layer, in this order from the base material side.