Touch Panel Conductive Member with Segmented Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch panels with fine metal wire sensing electrodes face challenges in balancing detection sensitivity and parasitic capacitance, leading to decreased sensitivity when trying to improve detection accuracy, especially when the electrode width is increased on the display device side.
Innovation Solution
The implementation of a conductive member for touch panels with a second electrode layer having non-connection lines insulated from the electrode lines and a larger electrode width compared to the first electrode layer, along with an optimized occupancy rate of these lines, to reduce parasitic capacitance and enhance detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electrode width of the sensing electrode on the display device side is increased to improve detection sensitivity, then the electromagnetic wave shielding effect is enhanced and noise is reduced, but the parasitic capacitance is increased and detection sensitivity is decreased
Solution Approach 1:
The second sensing electrode is divided into multiple second electrode lines that are arranged in parallel and insulated from each other. This segmentation allows the electrode to achieve sufficient width for electromagnetic wave shielding while maintaining lower parasitic capacitance through the distributed structure. The insulation between individual lines prevents the capacitance from scaling linearly with width.
Solution Approach 2:
A transparent insulating member is introduced between the first electrode layer and the second electrode layer to provide electrical insulation. This intermediary element allows the second electrode lines to be insulated from each other while maintaining the structural integrity and electromagnetic wave shielding capability of the overall electrode structure.
2Reliability
If a plurality of non-connection lines are added to the sensing electrode on the display device side to reduce parasitic capacitance, then detection sensitivity is improved, but the device complexity is increased
Solution Approach 1:
The second electrode lines serve dual functions: they contribute to electromagnetic wave shielding due to their width, and they provide detection functionality through their conductive paths. The transparent insulating member simultaneously provides electrical insulation between lines and structural support. This multi-functionality reduces the need for additional dedicated components.
Solution Approach 2:
The insulation structure is applied locally between adjacent second electrode lines only where necessary for electrical isolation, rather than using a complete insulating layer throughout. This localized approach to insulation reduces material usage and structural complexity while achieving the necessary electrical isolation to reduce parasitic capacitance.
Data Source
AI summary
In a conductive member in which a first electrode layer is positioned closer to a touch surface side compared to a second electrode layer, the first electrode layer includes a plurality of first sensing electrodes aligned in a first direction, each of the first sensing electrodes has a plurality of first electrode lines and has a first electrode width W1, the second electrode layer includes a plurality of second sensing electrodes aligned in a second direction perpendicular to the first direction, each of second sensing electrodes has a plurality of second electrode lines and a plurality of non-connection lines insulated from the plurality of second electrode lines, and has a second electrode width W2, and the second electrode width W2 is larger than the first electrode width W1.