Touch Panel Island Insulator Structure for Low-Visibility Bridge Lines
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Solution Overview
Problem
Touch panels used in display devices face visibility issues due to bridging structures, which can reduce display quality by causing reflections and affecting the intuitive input operation.
Innovation Solution
A touch panel design featuring an island insulator with a non-rectangular contour that encapsulates the bridge line, allowing reflective light to diverge and reduce visibility, thereby maintaining ideal display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bridge line structure is used to connect sensing electrodes, then the electrical connection between electrodes is improved, but the visibility of the bridge line increases and display quality deteriorates
Solution Approach 1:
The bridge line is extracted from the visible front surface and relocated to the back surface of the touch panel. The connection between sensing electrodes is achieved through the substrate rather than surface-level bridging, removing the visual obstruction while maintaining electrical connectivity.
Solution Approach 2:
The connection structure transitions from a two-dimensional surface-level bridge line to a three-dimensional subsurface pathway. The bridge line is positioned within or beneath the substrate layer, utilizing the vertical dimension to eliminate visibility issues while preserving functional connectivity.
2Reliability
If an insulation layer is added to separate bridge lines from electrode strings, then short circuit prevention is improved, but the structural complexity and visibility increase
Solution Approach 1:
The insulation function is merged with the substrate structure itself. The substrate serves dual purposes as both the mechanical support and the insulating barrier, eliminating the need for separate insulation layers and reducing overall structural complexity.
Solution Approach 2:
The substrate is given multiple functions: it provides mechanical support, electrical insulation, and structural integration for the bridge line connection. This multi-functionality reduces the total number of components needed in the touch panel structure.
Data Source
AI summary
A touch panel including a substrate, a plurality of sensing electrodes, a bridge line, a connection line and an island insulator is provided. The sensing electrodes are disposed on the substrate in parallel. The bridge line is disposed on the substrate and connected between two of the sensing electrodes. The connection line is disposed on the substrate and connected between another two of the sensing electrodes. The bridge line intersects the connection line. The island insulator is disposed on the substrate and covers the bridge line. The bridge line is completely encapsulated between the island insulator and the substrate. The island insulator includes a central portion and a distal portion extended from the central portion. A width of the distal portion is gradually reduced outwardly from the central portion.