Transparent Conductive Pattern Layout to Prevent Display Moiré
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Solution Overview
Problem
The Moire phenomenon occurs in display devices with metal mesh patterns for electromagnetic wave shielding, causing visual interference and limiting the improvement of resolution in plasma display panels, due to the high resistance and cost of transparent conductive films like ITO, and the difficulty in matching line width, pitch, and angle of metal patterns with pixel patterns.
Innovation Solution
An electrical conductor with a transparent substrate and an electric conductive pattern that covers 30% or more of the area, featuring a distance distribution ratio of standard deviation to average value of 2% or more, formed using methods like printing, photolithography, or sputtering, which prevents Moire phenomenon while maintaining excellent conductivity and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal mesh pattern is used for electromagnetic wave shielding, then shielding effectiveness is improved, but Moire phenomenon occurs due to interference with pixel patterns
Solution Approach 1:
The patent applies asymmetry by using a curved pattern instead of a regular mesh pattern. The curve radius is specifically designed to be 0.05mm to 0.5mm, creating an asymmetric geometry that disrupts the periodic interference causing Moire phenomenon while maintaining electromagnetic wave shielding effectiveness through continuous conductive coverage
Solution Approach 2:
The patent changes the geometric parameters of the shielding pattern by curving the lines with a specific radius (0.05mm to 0.5mm). This parameter modification transforms the regular mesh structure into a curved pattern that eliminates Moire interference while preserving the electrical continuity needed for effective electromagnetic shielding
2Illumination intensity
If a transparent conductive film such as ITO is used, then transparency is maintained, but resistance is high (100 ohms/square or more) reducing sensitivity
Solution Approach 1:
The patent uses a composite structure combining transparent substrate material with a metallic curved pattern. This composite approach achieves both transparency (through the clear substrate and optimized pattern density) and low resistance (through the continuous metallic conductive paths), overcoming the limitations of pure ITO films
Solution Approach 2:
The patent applies curvature to the conductive pattern, using curved lines with radius 0.05mm to 0.5mm instead of straight lines. This curvature optimizes the electrical path while maintaining visual transparency, creating a balance between optical and electrical performance that straight-line patterns cannot achieve
3Object-affected harmful factors
If the line width and pitch of metal mesh pattern are controlled to remove Moire phenomenon, then Moire phenomenon is reduced, but it must correspond to different patterns according to display device specifications
Solution Approach 1:
The curved pattern design serves multiple functions universally: it eliminates Moire phenomenon through its non-periodic geometry, maintains electromagnetic shielding effectiveness through continuous conductive paths, and adapts to different display resolutions without requiring parameter adjustments. The curve radius of 0.05mm to 0.5mm provides a universal solution across various display specifications
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 effectively prevents Moire phenomenon, ensures high conductivity, and allows for precise touch recognition without visual obstruction, even at various angles, and meets electromagnetic wave shielding requirements, as demonstrated by its performance in plasma display panels and touch screens.
Implementation Method 1
An electromagnetic wave shield film includes a transparent substrate and a metal mesh pattern that is provided on the substrate
Implementation Method 2
a Moire phenomenon may be caused by the interference between the metal pattern and a pixel pattern of the display
Data Source
AI summary
Provided are an electrical conductor and a production method therefor; the electrical conductor comprising a transparent substrate and an electro-conductive pattern provided on at least one surface of the transparent substrate, and the electroconductive pattern being of a type such that, for at least 30% of the entire surface area of the transparent substrate, when a straight line is drawn intersecting the electroconductive pattern, the ratio of the standard deviation to the mean value of the distances between adjacent points of intersection between the straight line and the electroconductive pattern (the distance distribution ratio) is at least 2%. Also, provided are an electrical conductor and a production method therefor; the electrical conductor comprising a transparent substrate and an electroconductive pattern provided on at least one surface of the transparent substrate, and the electroconductive pattern being of a type such that at least 30% of the entire surface area of the transparent substrate is accounted for by continuously distributed closed motifs, and the ratio of the standard deviation to the mean value of the surface areas of the closed motifs (the surface area distribution ratio) is at least 2%.