Touch Panel Connection Electrode Anti-View Layer Visibility
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Solution Overview
Problem
Capacitive touch panels face challenges in visibility due to external light interference and complex fabrication processes, particularly with single-layer transparent electrodes that require connection electrodes, making them difficult to manufacture and prone to visibility issues.
Innovation Solution
A touch panel design incorporating a substrate with a sensor part, connection electrode, and an anti-view part on the connection electrode to inhibit visibility from external light, using a conductive layer and anti-view layer that can be patterned without an etching process, and additional insulating layers to further enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection electrode is formed to connect electrode layers, then the electrode layers are electrically connected, but the fabrication process becomes complicated and difficult
Solution Approach 1:
The patent merges the connection electrode formation with the transparent electrode formation by using the same ITO layer for both sensing and connection purposes. The connection electrode is formed by extending the transparent electrode pattern in non-sensing regions, eliminating the need for separate connection electrode fabrication steps and simplifying the overall process.
Solution Approach 2:
The ITO layer serves multiple functions simultaneously: it acts as both the transparent sensing electrode and the connection electrode. By designing the electrode pattern to extend into non-sensing regions, the same material and layer perform dual roles, reducing fabrication complexity while maintaining electrical connectivity.
2Reliability
If a connection electrode is formed to connect electrode layers, then the electrical connection is established, but the visibility of the touch panel deteriorates due to external incident light
Solution Approach 1:
The patent addresses visibility by extending the electrode pattern into the third dimension of spatial layout - specifically into non-sensing regions adjacent to the active sensing area. This dimensional extension allows the connection function to be performed outside the visible display region, hiding the connection electrode from view while maintaining its electrical function.
Solution Approach 2:
The connection electrode function is extracted from the visible sensing region and placed in the non-sensing region. By separating the connection function spatially from the display area, the connection electrode becomes invisible to users while still performing its electrical connection role effectively.
3Illumination intensity
If the transparent electrode thickness is reduced, then the transparency is improved, but the connection electrode becomes more difficult to form
Solution Approach 1:
The patent combines the transparent electrode and connection electrode into a single ITO layer structure. By using the same thin transparent conductive oxide layer for both sensing and connection purposes, the design maintains high transparency while avoiding the need for separate, potentially thicker connection electrode layers that would compromise visibility.
Data Source
AI summary
Disclosed is a touch panel. The touch panel includes a substrate, a sensor part on the substrate, a connection electrode to connect the sensor part on the substrate, and an anti-view part on the connection electrode. A position of the connection electrode corresponds to a position of the anti-view part. A method of fabricating the touch panel includes forming the sensor part on the substrate, forming a connection electrode layer on the substrate, and patterning the connection electrode layer. The connection electrode layer includes a conductive layer and an anti-view layer.