Touch Panel Metal Wiring for Conductivity and Transmittance
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Solution Overview
Problem
Conventional touch screen panels face issues with electrical conductivity and visibility due to the need for additional connection electrodes, which can lead to defects like electrical short-circuits and reduced conductivity.
Innovation Solution
A touch screen panel design featuring metal wiring on the visible side of a display panel to connect sensing patterns with pad parts, using materials like indium tin oxide, indium zinc oxide, or molybdenum, and an auxiliary sensing pattern to cover the metal wiring, improving conductivity and minimizing visibility issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional connection electrodes are added to connect sensing patterns, then electrical conductivity is improved, but device complexity and manufacturing defects increase
Solution Approach 1:
The patent merges the connection electrode function with the sensing pattern itself by making the sensing pattern continuous across pixel boundaries. This eliminates the need for separate connection electrodes, reducing structural complexity while maintaining electrical conductivity. The sensing pattern serves dual purposes: sensing touches and connecting electrical circuits.
Solution Approach 2:
The sensing pattern is designed to perform multiple functions simultaneously: it acts as both the touch sensing element and the electrical connection pathway. This multi-functionality eliminates the need for dedicated connection electrodes, simplifying the overall structure while ensuring reliable electrical conductivity between pixels and pad parts.
2Reliability
If additional connection electrodes and contact holes are added, then electrical connectivity is improved, but manufacturing precision and reliability deteriorate due to potential short-circuits
Solution Approach 1:
The patent extracts the connection function from the electrode structure and integrates it into the sensing pattern itself. By removing the need for separate connection electrodes and contact holes, the manufacturing process is simplified, eliminating potential sources of defects such as short-circuits while ensuring reliable electrical connectivity.
Solution Approach 2:
Instead of adding separate connection elements to achieve connectivity, the patent inverts the approach by making the sensing pattern itself continuous and conductive across pixel boundaries. This eliminates the need for additional manufacturing steps that could introduce defects, while achieving the desired electrical connectivity.
3Reliability
If metal wiring is added to connect sensing patterns, then electrical conductivity is improved, but visibility and transmittance are reduced
Solution Approach 1:
The patent applies local quality by positioning the metal wiring specifically at pixel boundaries where it is least visible, while maintaining the sensing pattern's transparency in the display area. The sensing pattern itself remains transparent in active display regions, ensuring high transmittance, while metal connections are localized to non-display boundary areas.
Solution Approach 2:
The patent moves the metal wiring to a different spatial dimension - specifically to the pixel boundary regions rather than across the entire display area. This dimensional repositioning allows metal connections to be made without compromising the transmittance of the visible display areas, as the wiring is confined to non-display boundary zones.
Data Source
AI summary
A touch screen panel disposed at the visible side of a display panel includes a sensing pattern formed on one visible side surface of a substrate, and a metal wiring disposed on a top side of a region corresponding to a boundary between pixels in the display panel on the above surface, which connects the sensing pattern with a pad part, thus exhibiting improved touch sensitivity and excellent transmittance.