Touch Structure Trace Routing for Narrow Lower Frames
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Solution Overview
Problem
The self-capacitance mode in touch technology for wearable and medium/large devices results in a larger lower frame due to the increased number of touch traces, which contradicts the trend of narrow frames in modern mobile devices.
Innovation Solution
A touch structure design where touch traces are arranged to converge towards a central axis in the touch region, ensuring they do not overlap, allowing for a single metal layer and reducing the width of the lower frame region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-capacitance mode is used with multiple touch traces, then touch sensitivity is improved, but the lower frame width increases
Solution Approach 1:
The patent transitions from a single-layer planar arrangement to a multi-layer three-dimensional structure. Touch traces are distributed across multiple layers (first touch trace layer, second touch trace layer, third touch trace layer) with different spatial positions, allowing traces to be stacked vertically rather than spread horizontally. This dimensional change enables maintaining sufficient trace quantity for sensitivity while reducing the horizontal width of the lower frame region.
Solution Approach 2:
The patent implements nesting by placing touch traces from different layers within the same horizontal footprint area. The first, second, and third touch trace layers are arranged such that their orthographic projections overlap or are closely positioned, effectively nesting multiple trace structures within a compact horizontal space. This allows the system to maintain multiple functional traces while minimizing the overall frame width.
2Quantity of substance
If multiple touch traces are led out in self-capacitance mode, then touch electrode coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the touch trace system into multiple independent layers (first touch trace layer, second touch trace layer, third touch trace layer), each containing specific traces connected to different touch electrodes. This segmentation allows each layer to be manufactured and positioned independently, simplifying the overall manufacturing process compared to creating a single complex multi-trace layer. Each layer can be optimized separately for its specific function.
Solution Approach 2:
By adding the vertical dimension through multiple layers, the patent increases touch electrode coverage without proportionally increasing manufacturing complexity. The multi-layer structure allows traces to be stacked and routed in three dimensions, enabling comprehensive electrode coverage while maintaining manageable complexity through standardized layer fabrication processes.
Data Source
AI summary
A touch structure, a touch display panel and an electronic device are provided. The touch structure includes a substrate, is divided into a touch region and a lower frame region connected to the touch region; the touch region includes a touch electrode array and touch traces, the touch electrode array is on the substrate and includes touch electrodes arranged in rows and columns, the touch traces are electrically connected to the touch electrodes; and touch leads in the lower frame region, the touch leads are electrically connected to the touch traces; orthographic projections of every two adjacent touch traces on the substrate do not overlap with each other, a distance between the orthographic projections of every two adjacent touch traces on the substrate at a first position away from the lower frame region is larger than or equal to that at a second position close to the lower frame region.