Touch Control Substrate Layout for Bend-Induced Line Breakage
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Solution Overview
Problem
In Flexible Multi Layer On Cell (FMLOC) technology, touch control signal lines prone to breakage and peeling due to inorganic layer breakage at large angles, affecting product lifespan.
Innovation Solution
A touch control substrate design with a first and second metal layer, where the edges of the first touch control signal lines do not overlap with the edges of the second touch control signal lines, and a first insulating layer covers the tail ends of the first signal lines, preventing peeling and breakage during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double-layer metal wires with inorganic layer are used in folded products, then touch control function is achieved, but the inorganic layer breaks when bent at large angle causing film layer peeling and trace line breakage
Solution Approach 1:
The patent removes the inorganic layer from the trace line structure, retaining only the organic encapsulation layer and metal signal lines. This extraction eliminates the brittle component that causes failure during bending, while maintaining the touch control functionality through the remaining flexible layers.
Solution Approach 2:
The patent changes the material composition parameter by eliminating the inorganic layer entirely, transitioning from a multi-material structure (inorganic + organic + metal) to a simplified structure (organic + metal only). This parameter change fundamentally improves flexibility and bend resistance.
2Strength
If inorganic layer is disposed between metal wires, then structural support is provided, but breakage occurs at trace line end during large angle bending
Solution Approach 1:
The inorganic layer is completely removed from the structure. The patent demonstrates that the organic encapsulation layer alone provides sufficient structural support when properly designed, eliminating the need for the brittle inorganic layer that causes bend-related failures.
Solution Approach 2:
The patent uses a composite structure consisting of the organic encapsulation layer and metal signal lines without the inorganic layer. This composite design maintains structural integrity while improving flexibility and bend resistance, as the organic material naturally accommodates deformation better than inorganic materials.
Data Source
AI summary
A touch control substrate includes: a base, a first metal layer including first touch control signal lines, a first insulating layer; and a second metal layer including: second touch control signal lines electrically connected with the first touch control signal lines. An orthographic projection of an edge of a first end of the first touch control signal line on the base does not overlap with an orthographic projection of an edge of a first end of the second touch control signal line electrically connected with the first touch control signal line on the base. The orthographic projection of the edge of the first end of the first touch control signal line on the base at least partially overlap with an orthographic projection of the second touch control signal line on the base.