Touch Sensor Panel Transmission Line Anti-Resonance Design
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Solution Overview
Problem
Current touch sensor panels with antennas face challenges in avoiding resonance phenomena in transmission lines, leading to increased transmission loss, especially in compactified and thinned mobile terminal apparatuses, where space for antenna modules is limited.
Innovation Solution
A touch sensor panel design featuring a substrate with a signal wire on one surface and ground wires on the other, electrically connected at the antenna end, along with anti-resonance wires and optimized ground wire lengths to prevent resonance and reduce transmission loss, while maintaining low sheet resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna module is mounted on the touch sensor panel to maintain communication performance, then the antenna length can be optimized for wavelength, but the transmission line becomes more prone to resonance phenomena causing increased transmission loss
Solution Approach 1:
The patent extracts the ground wire from a conventional planar configuration and forms it into a three-dimensional structure that extends in the thickness direction of the substrate. This extracted ground wire structure is positioned adjacent to the signal wire, creating a transmission line where the ground wire's extended geometry effectively eliminates resonance phenomena while maintaining low transmission loss, thus resolving the contradiction between communication performance and energy loss.
2Device complexity
If the transmission line is designed with conventional planar ground wires, then the structure is simple, but resonance occurs causing increased transmission loss
Solution Approach 1:
The patent transitions the ground wire from a two-dimensional planar configuration to a three-dimensional structure that extends in the thickness direction of the substrate. This dimensional change allows the ground wire to be positioned adjacent to the signal wire in three-dimensional space, creating a transmission line geometry that eliminates resonance phenomena while maintaining structural simplicity and reducing transmission loss.
3Volume of moving object
If the antenna module is made compact to fit limited space in thinned mobile devices, then the device can be compactified and thinned, but the transmission line becomes more susceptible to resonance
Solution Approach 1:
The patent utilizes the thickness dimension of the substrate to position the ground wire in three-dimensional space adjacent to the signal wire. This allows the transmission line to achieve an optimized geometry for eliminating resonance phenomena within the compact, thinned device structure, thereby maintaining low transmission loss while accommodating the compactified antenna module in limited space.
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 effectively avoids resonance in the transmission line, reduces transmission loss, and enhances the flexibility and compactness of antenna placement in mobile devices, improving communication efficiency and battery life.
Implementation Method 1
a resonance phenomenon in a transmission line of an antenna is avoided
Data Source
AI summary
A touch sensor panel has a touch sensor portion which is provided on a substrate and includes a detection portion and a peripheral wiring portion, an antenna, a transmission line portion connected to the antenna, and a control board connected to the touch sensor portion and the transmission line portion. The transmission wiring portion has a signal wire which is provided on one surface of the substrate and connected to the antenna and two ground wires which are provided on the other surface of the substrate across a disposition region corresponding to a region, in which the signal wire is provided, and electrically connected to each other at least at an end on the antenna side.