Capacitive Touch Panel Bridging Lines Noise Reduction
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Solution Overview
Problem
Conventional capacitive touch panels face difficulties in accurately identifying touched locations due to noise generated by gaps between bonding wirings on opposite surfaces of the transparent substrate, affecting the precision of coordinate detection.
Innovation Solution
A capacitive touch panel design featuring arrays of first and second conductors on the same surface of a transparent substrate, with bridging lines and insulators to separate and intersect, forming a matrix of capacitive regions that reduce noise by eliminating gaps between bonding wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding wirings are formed on opposite surfaces of the transparent substrate, then electrical connection is achieved, but gaps between bonding wirings generate noise that reduces measurement precision
Solution Approach 1:
The patent transitions from a three-dimensional configuration with bonding wirings on opposite surfaces to a two-dimensional configuration where all conductors are arranged on the same surface. This dimensional change eliminates the vertical gaps that caused noise while maintaining electrical connectivity through planar bridging lines.
Solution Approach 2:
The patent extracts and eliminates the problematic bonding wirings that extend through the substrate thickness. By removing these vertical conductors and replacing them with surface-level bridging lines, the noise-generating gaps are eliminated while the essential electrical connection function is preserved through alternative routing.
2Ease of manufacture
If gaps are formed between bonding wirings on opposite surfaces, then wire bonding is simplified, but noise is generated that reduces manufacturing precision
Solution Approach 1:
The patent relocates all conductor connections to the same surface plane, eliminating the need for vertical wire bonding through the substrate. This planar arrangement maintains manufacturing simplicity while removing the noise-generating gaps that compromised precision.
Solution Approach 2:
The patent introduces bridging lines as intermediary conductors on the same surface to replace the function of bonding wirings. These bridging lines connect electrode units without creating gaps, serving as mediators that maintain electrical connectivity while eliminating noise interference.
3Reliability
If bonding wirings are used to connect electrode units, then electrical connectivity is established, but gaps between wirings create harmful electromagnetic interference
Solution Approach 1:
The patent extracts and removes the harmful bonding wirings that generate electromagnetic noise through gaps. By eliminating these vertical conductors and replacing them with planar bridging lines, the source of electromagnetic interference is removed while connectivity is maintained.
Solution Approach 2:
The patent converts the problematic gap structure into a beneficial continuous planar arrangement. By replacing the noisy vertical wiring with surface-level bridging lines, the design transforms the harmful electromagnetic interference into a noise-free configuration while preserving electrical function.
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 design enhances the accuracy of touch location detection by minimizing noise interference, allowing for precise identification of touched coordinates through the capacitive matrix formed by the conductors and bridging lines.
Implementation Method 1
an array of first conductors 41 formed on the top surface 31 of the transparent substrate 3; an array of second conductors 42 formed on the top surface 31 of the transparent substrate 3 and disposed alternately with the first conductors 41
Implementation Method 2
When the capacitive type touch panel is activated, an electric field distribution is generated between the top and bottom surfaces of the transparent substrate 11. At this time, when the user operably touches the capacitive type touch panel at one location, the electric field at the location is changed, which results in a change in the capacitance
Data Source
AI summary
A capacitive type touch panel includes: a transparent substrate; an array of first conductors formed on a surface of the transparent substrate; an array of second conductors formed on the surface of the transparent substrate; a plurality of conductive first bridging lines, each of which interconnects two adjacent ones of the first conductors; a plurality of conductive second bridging lines, each of which interconnects two adjacent ones of the second conductors and each of which intersects insulatively a respective one of the first bridging lines; and a plurality of spaced apart insulators, each of which is disposed at an intersection of a respective one of the first bridging lines and a respective one of the second bridging lines to separate the respective first and second bridging lines.