Mesh Conductive Sheet for 3D Touch Panel Bending
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Solution Overview
Problem
During three-dimensional molding of touch panels, disconnections often occur in detection electrodes and peripheral wirings due to local extension of the resin film during heating, making it challenging to prevent these disconnections.
Innovation Solution
A conductive sheet for touch panels is designed with detection electrodes and peripheral wirings formed from mesh-patterned thin conductive metal wires, where the wire width is less than 5 μm and the extension direction is inclined relative to the bending line, allowing the mesh to follow the resin film's extension and preventing disconnections by ensuring seamless integration and reduced stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the resin film is subjected to three-dimensional molding through heating, then a three-dimensional touch panel with bent portions is obtained, but disconnection occurs in the detection electrodes or peripheral wirings due to local extension of the resin film
Solution Approach 1:
The detection electrodes and peripheral wirings are divided into mesh patterns composed of intersecting thin conductive metal wires, allowing the structure to flex and extend locally without causing disconnection during three-dimensional molding
Solution Approach 2:
The wire width of the metal mesh is controlled to be equal to or less than 5 μm, and the extension direction of the metal wires is inclined at 45 degrees relative to the bending line direction, optimizing the balance between conductivity and flexibility to prevent disconnection during heating and molding
2Reliability
If the wire width of the metal mesh is reduced to prevent disconnection, then disconnection is suppressed during molding, but the conductivity and detection sensitivity may be affected
Solution Approach 1:
The electrode structure is segmented into a mesh pattern with numerous intersecting wires, where the collective cross-sectional area of multiple thin wires compensates for the reduced individual wire width, maintaining sufficient conductivity while achieving the flexibility needed to prevent disconnection
Solution Approach 2:
The conductive layer is formed as a composite structure combining resin film and metal mesh, where the resin provides mechanical support and the metal mesh provides conductivity, with the mesh configuration optimized to balance both electrical performance and mechanical flexibility
3Ease of manufacture
If the extension direction of the metal wires is parallel or perpendicular to the bending line, then the manufacturing process is simpler, but disconnection occurs more easily during bending
Solution Approach 1:
The metal wires are oriented at an asymmetric 45-degree angle relative to the bending line direction rather than parallel or perpendicular, creating a diagonal configuration that distributes stress more evenly and prevents disconnection during bending while remaining manufacturable through standard mesh patterning techniques
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses disconnections and resistance increases, resulting in a touch panel with enhanced detection sensitivity and visibility.
Implementation Method 1
the mesh extends to follow the extension locally occurring in the bent portion or other portions at the time of three-dimensional molding (bending)
Data Source
AI summary
In a second-conductive-sheet for a touch-panel, a plurality of upper-detection-electrodes disposed in a detection region and a plurality of second terminal wiring portions disposed in a peripheral wiring region to electrically connect the upper-detection-electrodes to second terminal portions and are formed. Each of the upper-detection-electrodes is made of a mesh-patterned first metal mesh having intersecting thin conductive metal wires, and each of the second terminal wiring portions is made of a mesh-patterned second metal mesh having intersecting thin conductive metal wires made of the same material as the thin conductive metal wires constituting each of the upper detection electrodes. The wire width of the first metal mesh is set to be equal to or less than 5 μm, and the extension direction of the thin conductive metal wires constituting the first metal mesh and the second metal mesh is inclined with respect to a bending line direction of a bent portion of a second-resin-film.