Capacitive Touch Panel Substrate Strength via Insulating Layer
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Solution Overview
Problem
Capacitive touch panels face a decrease in substrate strength due to the direct formation of detection electrodes and connecting electrodes on the substrate surface, leading to potential cracking and strength reduction.
Innovation Solution
Incorporating a second insulating layer between the substrate and the detection electrodes and connecting electrodes, which separates them from the substrate surface, thereby reducing the concentration of potassium ions and minimizing stress on the substrate, and using a strengthened glass substrate chemically strengthened by ion exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If detection electrodes and connecting electrodes are directly formed on the substrate surface, then the device structure is simplified and manufacturing is easier, but the substrate strength is degraded
Solution Approach 1:
An insulating layer is introduced as an intermediary between the substrate and the detection/connecting electrodes. This insulating layer prevents direct contact between the electrodes and substrate, eliminating the harmful effect of electrode formation on substrate strength while maintaining the electrical functionality of the device.
Solution Approach 2:
The structure is segmented into distinct layers: substrate, insulating layer, and electrode layer. This segmentation separates the structural function (substrate) from the electrical function (electrodes), allowing each layer to be optimized independently for its specific purpose.
2Device complexity
If electrodes are directly formed on the substrate, then the number of layers is reduced, but potassium ion concentration increases causing stress and cracking
Solution Approach 1:
The insulating layer serves as a mediator that blocks the interaction between potassium ions in the glass substrate and the metal electrodes. This prevents ion migration and concentration buildup that would otherwise cause stress and cracking, thereby improving substrate reliability.
Solution Approach 2:
The insulating layer is applied beforehand to protect the substrate from future ion migration issues. This preventive measure cushions against potential reliability problems before they can occur during device operation.
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 enhances the substrate's strength by preventing potassium ion concentration and stress-related cracking, maintaining the substrate's integrity and improving the durability of the capacitive touch panel.
Implementation Method 1
using a strengthened glass substrate chemically strengthened by ion exchange
Data Source
AI summary
An input device, a display device and an electronic apparatus are disclosed. The input device includes a substrate with a main surface. First and second detection electrodes, first and second connecting electrodes, first and second insulating layer are disposed on the main surface. The first and second detection electrodes are aligned in first and second directions, respectively. The first connecting electrodes each connect two of the neighboring first detection electrodes. The second connecting electrodes each connect two of the neighboring second detection electrodes. The first insulating layer is located on the first connecting electrode. The second insulating layer is disposed between the main surface of the substrate, and at least one of the first and second detection electrodes and the first connecting electrodes. The second insulating layer separates the main surface from the at least one of the first and second detection electrodes and the first connecting electrodes.