Capacitive Touch Panel Electrode Overlap for Insulator Adhesion
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Solution Overview
Problem
Capacitive-sensing-type touch panels face reliability issues due to stress-induced peeling of insulators from the substrate, leading to potential disconnection of connection electrodes and reduced device reliability.
Innovation Solution
The design includes first and second detection electrodes on a substrate with a first connection electrode covered by an insulator and a second connection electrode straddling over the insulator, with portions of the first detection electrodes covering the insulator to reduce stress and improve adhesion, and using transparent materials to enhance visibility and detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulator is provided to cover the first connection electrode, then insulation performance is improved, but the insulator may peel off from the substrate when stress is applied, reducing reliability
Solution Approach 1:
The first detection electrode is extended in the vertical dimension to cover the insulator, creating a three-dimensional overlapping structure. This dimensional extension allows the detection electrode to provide mechanical reinforcement to the insulator without interfering with its insulation function, thereby preventing peeling while maintaining electrical insulation.
Solution Approach 2:
The detection electrode and insulator are merged into a single integrated structure where the detection electrode overlaps and covers the insulator. This merging creates a composite structure that combines the electrical detection function with the mechanical reinforcement function, eliminating the need for separate reinforcement elements.
2Illumination intensity
If the insulator is made thin to maintain transparency, then visibility is improved, but the insulator becomes more susceptible to peeling under stress
Solution Approach 1:
The solution moves from thickening the insulator in the vertical dimension to extending the detection electrode in the vertical dimension to cover the insulator. This allows the insulator to remain thin for transparency while the overlapping detection electrode provides the necessary mechanical reinforcement against peeling.
Solution Approach 2:
The first detection electrode is given a dual function: it not only detects touch input but also serves as a mechanical reinforcement element by covering and supporting the insulator. This multi-functionality allows the insulator to remain thin without compromising reliability.
3Reliability
If the first detection electrodes are extended to cover the insulator, then structural reinforcement is improved, but device complexity increases
Solution Approach 1:
The first detection electrode is designed to perform multiple functions simultaneously: touch detection and structural reinforcement of the insulator. By making the detection electrode serve dual purposes, no additional components are needed, and device complexity is avoided despite the improved reliability.
Solution Approach 2:
The detection function and structural support function are merged into a single component (the first detection electrode). This consolidation eliminates the need for separate reinforcement structures, maintaining device simplicity while achieving the desired reliability improvement.
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 reduces the likelihood of insulator peeling and moisture absorption, enhancing the reliability and detection sensitivity of the input device while maintaining transparency and visibility.
Implementation Method 1
capacitive-sensing-type touch panel, which captures changes in electrostatic capacity between a finger and a detection electrode to detect the input location
Data Source
AI summary
According to one aspect of the present invention, an input device includes: a substrate; first detection electrodes; second detection electrodes; a first connection electrode; an insulator; and a second connection electrode. The first detection electrodes are provided on or above the substrate and arrayed along a first direction. The second detection electrodes are provided on or above the substrate and arrayed along a second direction. The first connection electrode is provided on or above the substrate and connecting adjacent first detection electrodes. The insulator is provided on or above the substrate so as to cover the first connection electrode. The second connection electrode is provided on or above the insulator so as to straddle over the insulator, and connecting adjacent second detection electrodes. The portion of the first detection electrodes covers a portion of the insulator.