Flexible Display Panel Bridge Line Touch Structure
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Solution Overview
Problem
Flexible display panels with thick touch and encapsulation layers are prone to film breakage and failure after repeated bending, due to their large total thickness.
Innovation Solution
A display panel structure with a touch line layer disposed between two inorganic layers, featuring a bridge line that connects disconnected touch lines through via holes, reducing the overall thickness and enhancing bending performance by using a thin film encapsulation structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch layer and encapsulation layer are made thick to ensure durability and protection, then the reliability and protection capability are improved, but the total thickness increases causing film breakage during repeated bending
Solution Approach 1:
The encapsulation layer is divided into multiple thin inorganic layers (first inorganic layer, second inorganic layer, third inorganic layer) with the touch line layer positioned between the first and second inorganic layers. This segmentation allows each layer to be thinner and more flexible, preventing film breakage during bending while maintaining protective functionality.
Solution Approach 2:
The touch line layer is positioned in the vertical dimension between inorganic layers rather than being a separate horizontal layer, utilizing the z-dimension to reduce overall thickness while maintaining touch functionality through the bridge line structure.
2Reliability
If the touch line layer is made continuous to ensure electrical connection, then the electrical conductivity is improved, but the structural integrity during bending deteriorates
Solution Approach 1:
The second touch line is divided into segments with disconnections at intersections with the first touch line. The bridge line structure provides alternative electrical pathways through via holes, maintaining electrical connectivity while allowing the touch line segments to flex independently during bending, preserving structural integrity.
Solution Approach 2:
The bridge line acts as an intermediary element connecting disconnected segments of the second touch line through via holes in the inorganic layers. This mediator maintains electrical continuity while allowing the touch line segments to move independently, preventing structural failure during bending.
3Adaptability or versatility
If multiple layers are added to improve functionality and protection, then the feature richness is improved, but the device complexity increases
Solution Approach 1:
The multi-layer inorganic structure serves multiple functions simultaneously: the first, second, and third inorganic layers provide encapsulation and protection, the positioned touch line layer enables touch functionality, and the bridge line structure provides both electrical connection and mechanical flexibility. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The touch line layer is merged within the encapsulation structure between inorganic layers rather than being a separate component. The bridge line structure merges electrical connection functionality with mechanical flexibility, combining multiple functions into a single integrated solution that reduces overall device complexity.
Data Source
AI summary
A display panel includes a first inorganic layer, a touch line layer, a second inorganic layer, an organic layer, and a bridge line which are sequentially stacked. The touch line layer includes a first touch line and a second touch line, and the second touch line is disconnected at an intersection with the first touch line. The second inorganic layer is provided with a first via hole, and the organic layer is provided with a second via hole. The bridge line is electrically connected to the disconnection via the second via hole and the first via hole to implement that the second touch line is in electrical connection at the intersection.