Flexible Display Panel Parallel Wiring Layers Bending Reliability
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Solution Overview
Problem
Flexible display panels often experience metal wire breaks in the bending area, leading to display defects due to the high risk of line breaking in the bending region.
Innovation Solution
The flexible display panel incorporates at least two parallel wiring layers in the bending area, fabricated in the same layer as the source-drain electrode and touch metal layers, with through-holes connecting them, which reduces the risk of crack propagation and ensures continuous signal transmission even if one layer breaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single metal wiring layer is used in the bending area, then the device structure is simple and manufacturing is easier, but the metal wires break easily during bending causing display defects
Solution Approach 1:
The patent divides the single metal wiring layer into multiple parallel wiring layers (at least two layers). Each layer contains metal wires that can independently transmit signals. This segmentation ensures that if one layer breaks during bending, other layers can still function, thereby improving wiring reliability without significantly complicating the overall structure.
Solution Approach 2:
The patent transitions from a single-plane wiring structure to a multi-layer stacked wiring structure in the bending area. By adding the vertical dimension (stacking multiple wiring layers), the system gains redundancy - signals can be transmitted through alternative paths in different layers when one layer fails, thus improving reliability while maintaining manufacturing feasibility.
2Reliability
If multiple parallel wiring layers are used in the bending area, then the risk of signal transmission failure is reduced, but the device structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The patent combines multiple wiring layers into a unified structure where the layers are fabricated using the same manufacturing processes as the existing source-drain electrode and touch metal layers. This merging approach allows the additional wiring layers to be integrated into the existing manufacturing workflow without requiring entirely new fabrication techniques, thereby reducing the increase in manufacturing difficulty.
Solution Approach 2:
The additional wiring layers serve multiple functions: they provide redundant signal transmission paths, act as part of the touch sensor structure, and maintain compatibility with existing manufacturing processes. This multi-functionality justifies the increased structural complexity by delivering multiple benefits simultaneously.
Data Source
AI summary
The present disclosure provides a flexible display panel including a display area and a non-display area, and a bending area is arranged therebetween. The flexible display panel further includes a flexible substrate and a thin film transistor layer. The thin film transistor layer includes a semi-conductor layer, a gate electrode insulation layer, a gate electrode layer, an insulation interlayer and a source-drain electrode metal layer. The flexible display panel includes a touch layer arranged on one side of the thin film transistor layer away from the flexible substrate. The touch layer includes a first and second touch metal layer. The flexible display panel further includes signal transmission lines including at least two parallel wiring layers in the bending area. Each wiring layer is fabricated in a same layer with at least two of the source-drain electrode metal layer, the first touch metal layer, and the second touch metal layer.