Transparent Electrode Capacitance Sensor Using Homogeneous Pseudo Auxiliary Electrode
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Solution Overview
Problem
Existing transparent electrode capacitance sensors face issues with misalignment between the transparent electrode and auxiliary electrode, leading to variations in conduction area, increased material cost due to expensive materials like silver, and reduced viewable area, along with parasitic capacitance caused by air bubbles and material differences.
Innovation Solution
A transparent electrode capacitance sensor design featuring a pseudo auxiliary electrode formed from the same material as the transparent electrode, with a thicker profile and integrated lead wire, using techniques like metal vapor deposition and coffee-ring phenomenon to minimize level differences and bubbling, while reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different materials are used for the auxiliary electrode and transparent electrode, then the auxiliary electrode can suppress variation in detection sensitivity, but the auxiliary electrode outstands and compromises appearance and designing properties
Solution Approach 1:
The patent applies homogeneity by using the same transparent conductive material for both the transparent electrode and the auxiliary electrode. This eliminates the material difference that causes the auxiliary electrode to stand out, ensuring visual uniformity across the entire electrode structure while maintaining the auxiliary electrode's functional role in suppressing detection sensitivity variation.
Solution Approach 2:
The auxiliary electrode is created as a copy of the transparent electrode material composition. By using the identical transparent conductive material, the auxiliary electrode visually blends with the transparent electrode, eliminating the appearance issue while preserving the electrical functionality needed for capacitance detection.
2Reliability
If different materials are used for the auxiliary electrode and transparent electrode, then the auxiliary electrode can suppress variation in detection sensitivity, but a great level difference is created and air bubbles are entrapped leading to increased parasitic capacitance
Solution Approach 1:
By using the same transparent conductive material for both electrodes, the patent ensures uniform material properties and compatible surface characteristics. This reduces the level difference between electrodes and prevents air bubble entrapment during the formation process, thereby minimizing parasitic capacitance while maintaining detection sensitivity.
3Reliability
If different materials are used for the auxiliary electrode and transparent electrode, then the auxiliary electrode can suppress variation in detection sensitivity, but the viewable area of the transparent electrode is reduced
Solution Approach 1:
The patent uses the same transparent conductive material for both the transparent electrode and auxiliary electrode, making the auxiliary electrode visually indistinguishable from the transparent electrode. This allows the auxiliary electrode to extend beyond the visible display area without reducing the viewable area, as it blends seamlessly with the transparent electrode structure.
4Reliability
If different materials are used for the auxiliary electrode and transparent electrode, then the auxiliary electrode can suppress variation in detection sensitivity, but material cost increases due to expensive materials like silver and gold
Solution Approach 1:
The patent uses the same transparent conductive material for both electrodes, eliminating the need for expensive materials like silver or gold in the auxiliary electrode. This reduces material cost while maintaining the detection sensitivity functionality through the consistent electrical properties of the uniform material.
Solution Approach 2:
The patent replaces expensive conductive materials with a cost-effective transparent conductive material that can be applied in a uniform manner. By using the same material for both electrodes, the patent achieves reliable detection sensitivity without the high material costs associated with traditional multi-material approaches using precious metals.
5Manufacturing precision
If the transparent electrode and auxiliary electrode are precisely aligned, then the conduction area variation is avoided, but the manufacturing process becomes complicated
Solution Approach 1:
By using the same transparent conductive material for both the transparent electrode and auxiliary electrode, the patent simplifies the manufacturing process. The uniform material properties enable consistent application and curing characteristics, reducing the need for complex alignment procedures while maintaining precise conduction area control.
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
The solution enhances design properties, reduces parasitic capacitance, and increases the viewable area by using the same material for both electrodes, thereby improving reliability and cost-effectiveness.
Implementation Method 1
providing a transparent conductive material having a viscosity enough to cause a coffee-ring phenomenon on a transparent resin substrate; drying and curing the transparent conductive material under a condition enough to cause the coffee-ring phenomenon so as to form a transparent electrode and a pseudo auxiliary electrode
Implementation Method 2
the lead wire may be formed on the transparent resin substrate, and have a metal vapor deposition film
Data Source
AI summary
A transparent electrode capacitance sensor includes a transparent resin substrate; at least one transparent electrode formed on the transparent resin substrate; a pseudo auxiliary electrode formed in at least a portion of an outer periphery of the transparent electrode; and a lead wire connected to the pseudo auxiliary electrode, wherein the pseudo auxiliary electrode is thicker than the transparent electrode, and includes the same material as the transparent electrode.