Touch Panel Electrode Mesh Layout for Sensitivity and Resistance Stability
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Solution Overview
Problem
Existing touch panels with conductive members made of fine metal wires face issues with achieving high detection sensitivity and uniformity due to disconnections leading to increased resistance values, particularly in regions with insufficient intersections of fine metal wires.
Innovation Solution
A conductive member for touch panels is designed with a transparent insulating substrate, featuring first and second electrodes formed by mesh conductive films with varying electrode widths and mesh pitches, where sub-electrodes have smaller electrode widths and mesh pitches than main electrodes, ensuring sufficient intersections and reducing parasitic capacitance, thereby enhancing detection sensitivity and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fine metal wires are used to form mesh conductive films with larger mesh pitches, then parasitic capacitance is reduced and detection sensitivity is improved, but the number of intersections decreases leading to disconnections and increased resistance values
Solution Approach 1:
The patent applies different mesh pitches to different regions of the same electrode. Specifically, the conductive member includes a first region with a first mesh pitch and a second region with a second mesh pitch that is smaller than the first mesh pitch. This local differentiation allows the first region to benefit from lower parasitic capacitance and higher detection sensitivity, while the second region provides additional intersection points that ensure sufficient conductive paths and stable resistance values, thereby resolving the contradiction between detection sensitivity and resistance stability.
2Measurement precision
If electrode width is reduced to improve detection sensitivity, then parasitic capacitance decreases, but the electrode becomes more susceptible to disconnections
Solution Approach 1:
The patent implements different mesh pitches in different regions to compensate for the vulnerability of narrow electrodes. By placing regions with smaller mesh pitches at critical locations, the patent ensures that even though the overall electrode width is reduced for lower parasitic capacitance, the localized areas with denser mesh patterns provide sufficient intersection points to prevent disconnections and maintain conductive path continuity.
Data Source
AI summary
A conductive member for a touch panel includes a transparent insulating member; and a plurality of first electrodes extending in a first direction and arranged in parallel in a second direction intersecting the first direction, in which the plurality of first electrodes are constituted by a first mesh conductive film a plurality of fine metal wires are electrically connected, the plurality of first electrodes include a plurality of first main electrodes each having an electrode width Wa defined in the second direction and at least one first sub-electrode having an electrode width Wb smaller than Wa of the first main electrode in the second direction, the first sub-electrode is the first electrode arranged on an outermost side among the plurality of first electrodes, an opening ratio of the first sub-electrode is smaller than that of the first main electrode, and the first main electrode has a first dummy pattern.