Wave-Shaped Mesh Electrode Lines for Moiré and Starburst Reduction

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Solution Overview

Problem

Existing touch panels experience severe moiré and starburst phenomena due to straight metal lines in the mesh-typed electrode layer, which affect visibility and performance.

Innovation Solution

The metal lines in the mesh-typed electrode layer are configured in wave shapes, specifically 2-point or 3-point wave shapes, with irregular arrangements or sine waves, adhering to specific length and amplitude ratios to minimize moiré and starburst effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If straight metal lines are used in the mesh-typed electrode layer, then the manufacturing process is simple, but severe moiré and starburst phenomena occur

Engineering Contradiction:

Improvemetal line configurationVSAvoidmoiré and starburst phenomena

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies curvature by configuring metal lines in wave shapes (sinusoidal, triangular, or trapezoidal patterns) instead of straight lines. This curvature disrupts the regular periodic structure that causes moiré and starburst phenomena, while maintaining the mesh pattern's light transmission properties. The wave-shaped metal lines create an irregular pattern that prevents the formation of interference patterns.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Illumination intensity

If metal lines are arranged in a regular mesh pattern, then light transmission is increased, but moiré phenomenon is exacerbated

Engineering Contradiction:

Improvelight transmissionVSAvoidmoiré phenomenon

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces asymmetry by using wave-shaped metal lines with varying amplitudes and wavelengths within the mesh pattern. This asymmetric configuration breaks the regular periodicity of the mesh structure, preventing moiré phenomenon while preserving the overall mesh pattern's high light transmission capability. The irregular wave patterns ensure that no two adjacent metal lines have identical spacing or shape.

Inventive Principle:

Principle #4Asymmetry

3Object-affected harmful factors

If wave-shaped metal lines are used, then moiré and starburst phenomena are minimized, but the manufacturing complexity increases

Engineering Contradiction:

Improvemoiré and starburst phenomenaVSAvoidmetal line configuration

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent controls manufacturing complexity by defining specific parameter ranges for the wave-shaped metal lines, including wavelength (0.5-2 times the line width), amplitude (0.1-0.5 times the line width), and wave type (sinusoidal, triangular, or trapezoidal). These standardized parameter specifications enable consistent manufacturing through conventional photolithography processes while achieving the desired optical performance.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12373074B2Touch panel having a mesh-typed electrode layer

Publication Date: 2025.07.29 DONGWOO FINE CHEM CO LTD

AI summary

A touch panel having a mesh-typed electrode layer includes a substrate layer and the mesh-typed electrode layer formed on the substrate layer, in which the mesh-typed electrode layer has a mesh pattern and a metal line between nodes is configured in a wave shape.