Capacitive Touch Screen Single Layer Wiring Electrode Array

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Solution Overview

Problem

Capacitive touch screens with single ITO film designs often suffer from rainbow effects and increased complexity and cost due to bridging issues between electrodes, affecting transparency and display performance when affixed to LCDs.

Innovation Solution

A single layer wiring electrode array with zigzag-shaped or wave-shaped wires in capacitive regions and wiring regions, eliminating the need for bridging and reducing parasitic capacitance, while maintaining high touch sensitivity and display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single ITO film is used instead of two ITO films, then fabrication complexity and cost are reduced, but bridging issues occur between electrodes

Engineering Contradiction:

Improvefabrication process complexityVSAvoidelectrode connection reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies curvature by designing the wiring electrodes with zigzag or wave-shaped patterns instead of straight lines. This curved geometry allows the single ITO film to accommodate thermal expansion differences and mechanical stress during assembly, preventing bridge cracking while maintaining electrical connectivity. The curved paths distribute stress more evenly throughout the electrode structure.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of manufacture

If straight line wires are used to connect electrodes, then fabrication is simplified, but color stripes (rainbow effects) appear on the display

Engineering Contradiction:

Improvewiring fabrication easeVSAvoidrainbow effect on display

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces straight line wires with zigzag or wave-shaped wiring patterns. This curved design eliminates the rainbow effect by distributing the wire routing in a way that prevents interference patterns from forming on the LCD display. The zigzag pattern achieves this while remaining compatible with standard fabrication processes, thus maintaining ease of manufacture.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Reliability

If two ITO films are used to eliminate bridging issues, then electrode connection reliability is improved, but fabrication complexity and cost increase

Engineering Contradiction:

Improveelectrode connection reliabilityVSAvoidfabrication process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses curved zigzag or wave-shaped wiring patterns in the single ITO film to prevent bridge cracking. This approach achieves the reliability benefits of a more robust electrode design without requiring the addition of a second ITO film, thus avoiding the increased fabrication complexity and cost associated with multi-layer structures.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Reliability

If bridges are added to connect electrodes in single ITO film design, then electrode connection is improved, but parasitic capacitance increases

Engineering Contradiction:

Improveelectrode connection reliabilityVSAvoidparasitic capacitance

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent uses curved zigzag wiring patterns that inherently provide mechanical robustness and stress distribution without requiring additional bridge structures. This eliminates the parasitic capacitance that would be introduced by adding separate bridge elements, while still ensuring reliable electrode connections through the curved path design itself.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 prevents rainbow effects, enhances display clarity, simplifies the fabrication process, and improves touch sensitivity by ensuring a linear relationship in capacitance changes, thus providing a cost-effective and high-performance capacitive touch screen solution.

Implementation Method 1

eliminating the need for bridging and reducing parasitic capacitance

Methodology Applied

Scientific EffectParasitic capacitance: Parasitic Capacitance

Implementation Method 2

Capacitive touch screens operate with charge transfer through human body... the position of the touch point can therefore be detected by monitoring the changes of the currents of the meshes

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS10222919B2Capacitive touch screen and single layer wiring electrode array

Publication Date: 2019.03.05 SILEAD

AI summary

Disclosed are a capacitive touch screen and a single layer wiring electrode array. The single layer wiring electrode array includes capacitive regions and wiring regions located on one plane. Wires in the wiring regions are zigzag-shaped or wave-shaped. The capacitive touch screen includes a substrate; a single layer wiring electrode array disposed over the substrate, wherein the single layer wiring electrode array includes capacitive regions and wiring regions located on one plane and wires in the wiring region are zigzag-shaped or wave-shaped; and control ports for connecting to one or more integrated circuits, wherein the wires in the wiring regions are connected to the control ports respectively. The single layer wiring electrode array and the capacitive touch screen lower the fabrication cost and improve the display effects.