Touch Sensor Mesh Pattern Reduces Moiré Visibility

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Solution Overview

Problem

Capacitive-type touch sensors face issues with visibility of electrode patterns due to moiré phenomena and structural limitations, which affect touch sensitivity and user experience.

Innovation Solution

The design incorporates first and second mesh patterns with bridge electrodes and an auxiliary mesh pattern, where the auxiliary mesh pattern is positioned on top or below the sensing patterns, connected to them, and formed from materials like molybdenum, silver, or indium-tin oxide, to reduce visibility and enhance touch sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrode patterns are formed on the touch sensor to enable sensing, then touch sensitivity is improved, but visibility deteriorates due to moiré phenomenon

Engineering Contradiction:

Improvetouch sensitivityVSAvoidmoiré phenomenon

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The electrode patterns are divided into isolated unit patterns rather than continuous patterns. This segmentation breaks the regular periodic structure that causes moiré while maintaining sufficient sensing capability through the distributed arrangement of isolated units

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode patterns use asymmetric shapes rather than symmetric regular patterns. This asymmetry disrupts the periodicity that generates moiré effects while still providing effective capacitive sensing functionality

Inventive Principle:

Principle #4Asymmetry

2Reliability

If the thickness of sensing patterns is increased to improve signal strength, then touch sensitivity is improved, but visibility deteriorates as patterns become more visible

Engineering Contradiction:

Improvetouch sensitivityVSAvoidvisibility of sensing patterns

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an additional spatial dimension by placing auxiliary mesh patterns at different heights (upper or lower sides) relative to the main sensing patterns. This vertical separation in the Z-dimension allows the auxiliary patterns to interfere with the visual perception of the sensing patterns without compromising their electrical functionality

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS10606383B2Touch sensor comprising mesh pattern

Publication Date: 2020.03.31 DONGWOO FINE CHEM CO LTD

AI summary

A touch sensor includes a sensing pattern which includes a first mesh pattern formed in a first direction and a second mesh pattern formed in a second direction, the second mesh pattern including isolated unit patterns, a bridge electrode connecting the neighboring isolated unit patterns of the second mesh patterns, an insulation layer disposed between the sensing pattern and the bridge electrodes, and an auxiliary mesh pattern disposed on or below at least one of the first mesh pattern and the second mesh pattern, the auxiliary mesh pattern being connected to at least one of the first mesh pattern and the second mesh pattern.