Touch Panel Double-Layer Passivation Flexibility Reliability
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Solution Overview
Problem
Existing touch panels face a trade-off between flexibility and reliability, as the addition of a passivation layer to improve reliability often compromises the bending ability.
Innovation Solution
A double-layer passivation layer is implemented, comprising a soft passivation layer with a Young's modulus less than 1 GPa and a hard passivation layer with a modulus between 2 GPa and 4 GPa, to enhance both bending ability and anti-oxidation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passivation layer is added to improve reliability and prevent environmental damage, then the anti-oxidation ability is improved, but the flexibility (bending ability) of the touch panel is compromised
Solution Approach 1:
The passivation layer is divided into multiple sub-layers with different Young's moduli (first passivation layer with E < 1 GPa, second passivation layer with 1 GPa < E < 2 GPa, third passivation layer with E > 2 GPa). This segmentation allows each layer to contribute differently: softer layers maintain flexibility while harder layers provide oxidation protection, resolving the contradiction between reliability and flexibility.
Solution Approach 2:
Different regions of the passivation layer have different mechanical properties (Young's modulus values ranging from less than 1 GPa to greater than 2 GPa). This local quality variation enables the structure to simultaneously provide flexibility in certain regions and rigid protection in others, addressing both flexibility and anti-oxidation requirements.
2Reliability
If a hard passivation layer is used to improve anti-oxidation protection, then the reliability is improved, but the bending ability deteriorates
Solution Approach 1:
The passivation layer is constructed as a composite structure with multiple materials having different Young's moduli (ranging from less than 1 GPa to greater than 2 GPa). This composite structure combines the advantages of both soft materials (flexibility, bending ability) and hard materials (anti-oxidation protection), allowing the system to achieve both reliability and ease of operation simultaneously.
Data Source
AI summary
A touch panel having a visible area and a non-visible area disposed at least on one side of the visible area. The touch panel includes a substrate, a nano-metal conductive layer, a trace layer, a first passivation layer, and a second passivation layer. The nano-metal conductive layer is disposed on the substrate and at least in the visible area. The trace layer is disposed on the substrate and in the non-visible area. The trace layer is electrically connected to the nano-metal conductive layer. The first passivation layer covers the trace layer. The second passivation layer covers at least a portion of the first passivation layer. The first passivation layer has a different Young's modulus than the second passivation layer.