Touch Screen Wire Bunch Segmentation for Capacitance Reduction
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Solution Overview
Problem
High capacitance between column and row wire bunches in touch screens leads to low sensitivity in touch detection, particularly in mutual capacitance detection types.
Innovation Solution
A touch screen design with a transparent substrate featuring a column direction wire bunch and a row direction wire bunch, where the wire bunches are formed in a rectangular shape with reduced crossing points, allowing only detection column wires or row wires in specific block regions, thereby minimizing inter-wire capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection wires are arranged in a rectangular shape with reduced crossing points, then inter-wire capacitance is reduced and touch sensitivity is enhanced, but the complexity of wire arrangement and manufacturing precision requirements increase
Solution Approach 1:
The detection wire bunches are segmented into column direction wire bunches and row direction wire bunches with distinct rectangular arrangements. This segmentation reduces the number of crossing points between wires, thereby reducing inter-wire capacitance and improving touch detection sensitivity while maintaining manageable complexity through systematic organization
Solution Approach 2:
The patent applies different wire arrangement patterns to different regions: column direction wires are arranged with specific spacing in column regions, while row direction wires are arranged with specific spacing in row regions. This local optimization reduces capacitance at critical crossing points while maintaining detection coverage, balancing sensitivity improvement with manufacturing feasibility
2Measurement precision
If wire density is increased to improve detection sensitivity, then touch detection sensitivity improves, but inter-wire capacitance increases reducing effectiveness
Solution Approach 1:
The patent transitions from a single-plane wire arrangement to a multi-dimensional approach by separating wires into column direction bunches and row direction bunches that extend in different directions. This dimensional separation allows increased wire density in each direction while minimizing cross-directional capacitance, achieving high sensitivity without excessive inter-wire capacitance
Solution Approach 2:
The patent creates equipotential regions by arranging wires in rectangular bunches with consistent spacing patterns. This equipotential arrangement reduces potential differences between adjacent wires, thereby reducing inter-wire capacitance while maintaining sufficient wire density for high detection sensitivity
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 configuration reduces inter-wire capacitance, enhancing touch sensitivity and response time while maintaining robustness and durability.
Implementation Method 1
an electrostatic capacitance formed between an indicator such as a finger and the conductive elements serving as the detection wire is detected by a detection circuit
Implementation Method 2
A change in a coupling capacitance (capacitance between electrodes) involved in a change in an electric field between electrodes, which occurs in accordance with a contact to a substrate with an indicator such as a finger, is detected as the amount of charge
Data Source
AI summary
In a touch screen, the number of dummy column block region patterns is made smaller than the number of plurality of detection block region patterns. The plurality of detection block region pattern are obtained as a result of dividing a crossing region where a column direction wire bunch and a row direction wire bunch cross each other. The dummy column block region patterns are obtained as a result of dividing a crossing region where a dummy column direction wire bunch and a row direction wire bunch cross each other.