Concave Convex Pattern for Protective Film Positioning
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Solution Overview
Problem
The existing methods for manufacturing electrode substrates using the ink jet method face challenges in accurately adjusting the position of the end portion of the protective film, leading to reduced manufacturing yield due to the film often extending beyond the outer periphery of the electrode-substrate forming regions, which affects the accuracy of division and increases the risk of corrosion and exfoliation of sensing electrodes.
Innovation Solution
The introduction of a concave/convex pattern on the substrate, positioned closer to the outer periphery than the electrodes, helps in accurately positioning the end portion of the protective film by preventing its spread towards the outer periphery, thereby improving the manufacturing yield and reducing the risk of corrosion and exfoliation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the coating liquid is applied by the ink jet method to form a protective film, then the manufacturing process is simplified and productivity is improved, but the position of the end portion of the protective film cannot be accurately adjusted, leading to reduced manufacturing yield
Solution Approach 1:
A concave/convex pattern is introduced as an intermediary structure between the electrode and the protective film. This pattern serves as a physical barrier that mediates the spread of coating liquid, allowing the ink jet method to be used while still achieving precise positioning of the protective film end portion at the boundaries of the concave/convex pattern.
Solution Approach 2:
The concave/convex pattern is formed on the substrate before applying the coating liquid. This preliminary action creates predetermined boundaries that control where the coating liquid will spread and stop, enabling accurate positioning of the protective film end portion before the actual coating process occurs.
2Reliability
If the protective film extends beyond the outer periphery of the electrode-substrate forming region, then coverage of the electrode is improved, but the manufacturing yield is reduced due to difficulties in division and increased risk of corrosion and exfoliation
Solution Approach 1:
The concave/convex pattern creates localized regions with different properties - the convex portions provide elevated protective coverage over the electrode areas, while the concave portions create boundaries that prevent excessive spread. This local differentiation allows the protective film to cover where needed while maintaining clean division lines for manufacturing.
3Area of stationary object
If the coating liquid is allowed to spread freely on the substrate, then complete coverage is achieved, but the end portion position cannot be controlled and manufacturing precision is reduced
Solution Approach 1:
The substrate surface is segmented into multiple regions by the concave/convex pattern, creating distinct zones separated by boundaries. This segmentation allows the coating liquid to spread within each segment while being contained by the pattern boundaries, achieving both adequate coverage and precise position control at the segment edges.
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 solution enables precise adjustment of the protective film's end portion, enhancing the manufacturing yield and performance of the electrode substrates by preventing film spread beyond the intended regions and increasing the distance moisture must travel to reach the electrodes, thus reducing corrosion and exfoliation risks.
Implementation Method 1
a first concave/convex pattern which is disposed closer to an outer periphery of the first substrate than the first electrode is when seen in a plan view
Implementation Method 2
increasing the distance moisture must travel to reach the electrodes, thus reducing corrosion and exfoliation risks
Data Source
AI summary
An electrode substrate includes a sensing electrode formed on a glass substrate, a concave/convex pattern formed on the glass substrate, and a protective film formed so as to cover the sensing electrode. The concave/convex pattern is disposed closer to an outer periphery of the glass substrate than the sensing electrode is when seen in a plan view. The protective film is formed so as to cover a part of the glass substrate positioned between the sensing electrode and the concave/convex pattern when seen in a plan view.