Touch Panel Electrode Mesh Layout for Low-Resistance Sensing

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Solution Overview

Problem

Existing touch panels face challenges in reducing the resistance of drive and detection electrodes while maintaining positional accuracy, particularly when using transparent conductive films like indium tin oxide, which hinders detection speed and sensitivity.

Innovation Solution

The electrodes are designed with a mesh shape and overlapping connection portions made of metal or alloy, arranged in intersecting directions to reduce resistance and improve detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If transparent conductive films like ITO are used for electrodes, then transparency is maintained, but electrode resistance cannot be reduced sufficiently

Engineering Contradiction:

Improveelectrode resistanceVSAvoidmaterial selection constraint

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs a composite electrode structure combining transparent conductive film (ITO) and metal (Al) in a stacked configuration. The ITO layer maintains transparency while the metal layer provides low resistance, achieving both optical and electrical performance requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

2Reliability

If electrode width is increased to reduce resistance, then electrode resistance decreases, but positional accuracy of touch detection deteriorates

Engineering Contradiction:

Improveelectrode resistanceVSAvoidpositional accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The electrode is divided into multiple segments arranged in a grid pattern with electrode portions and connection portions. This segmentation allows the electrode to achieve low resistance through multiple parallel conduction paths while maintaining narrow width dimensions that preserve touch detection accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from conventional planar electrodes to a three-dimensional stacked structure with electrode portions and connection portions at different levels. This dimensional change enables resistance reduction through vertical conduction paths without increasing the horizontal footprint, thereby maintaining positional accuracy.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If mesh-shaped electrodes with metal are used, then electrode resistance is reduced and detection sensitivity is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvedetection sensitivityVSAvoidelectrode structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electrode is segmented into electrode portions for signal transmission and connection portions for electrical connection, arranged in a systematic grid pattern. This segmentation achieves low resistance and high detection sensitivity while maintaining manufacturability through standardized repetitive structures.

Inventive Principle:

Principle #1Segmentation

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 effectively reduces electrode resistance and enhances detection speed and sensitivity, maintaining positional accuracy in touch detection.

Implementation Method 1

Each of the plurality of first electrodes includes: a plurality of first electrode portions which are arranged with an interval in the first direction in a planar view; and a plurality of first connection portions each of which electrically connects the two first electrode portions adjacent to each other in the first direction

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

an electrostatic capacitance system is one of detection systems to detect a contact position at which the finger or the like is in contact with the touch panel

Methodology Applied

Scientific EffectElectrostatic capacitance: Capacitance

Implementation Method 3

the input position is detected using a fact that electrostatic capacitance of the capacitive element changes when the input tool such as the finger and the touch pen is in contact with the capacitive element

Methodology Applied

Scientific EffectElectrostatic induction: Electrostatic Induction

Data Source

PatentUS12493391B2Input device with electrode connection portions

Publication Date: 2025.12.09 MAGNOLIA WHITE CORP

AI summary

An input device is provided and includes substrate; first metal mesh shape electrodes provided on layer of substrate; second metal mesh shape electrodes provided on same layer of the substrate as first metal mesh shape electrodes; second metal connection electrodes each of which connects adjacent two of second metal mesh shape electrodes on same layer as first metal mesh shape electrodes; insulating film covering second metal connection electrodes; first transparent connection electrodes each of which connects adjacent two of first metal mesh shape electrodes on insulating film; and protective film covering first metal mesh shape electrodes, second metal mesh shape electrodes, and first transparent connection electrodes.