Metal Mesh Pattern for Touch Panel Moiré Reduction
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Solution Overview
Problem
Metal mesh technology in touch panels generates moiré when displaying specific patterns, leading to poor display performance due to the opaque nature of metal wires and their grid patterns, which are not effectively designed to avoid such interference.
Innovation Solution
A method for forming a metal mesh pattern where the shapes of mesh units are randomly generated by determining pitches and setting seed regions within mesh base units, with a constant area ratio, and forming metal mesh patterns from perpendicular bisectors of lines connecting seeds, which reduces the likelihood of moiré formation by creating irregular shapes that do not align with display panel patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If metal wires are used in grid pattern for touch detection, then touch detection capability is improved, but moiré interference is generated when displaying specific patterns
Solution Approach 1:
The patent transforms the traditional symmetric grid pattern into an asymmetric Voronoi pattern by using randomly distributed seed points. This asymmetric structure breaks the periodicity that causes moiré interference while preserving the mesh's touch detection function. The irregular cell boundaries and varying sizes prevent alignment with display pixel patterns.
Solution Approach 2:
The patent changes the geometric parameters of the mesh pattern by using Voronoi tessellation with randomly positioned seeds, creating variable cell sizes and shapes. This parameter variation prevents the regular spacing that leads to moiré effects, while maintaining adequate wire density for touch detection.
2Ease of manufacture
If regular grid pattern is used for metal mesh, then manufacturing is simplified, but moiré interference occurs with specific display patterns
Solution Approach 1:
The patent performs preliminary random seed placement and Voronoi tessellation calculation before manufacturing. This pre-computation of the irregular pattern allows for automated fabrication using standard manufacturing processes, maintaining ease of manufacture while eliminating moiré through the predetermined irregular geometry.
3Illumination intensity
If metal wires are made thin to improve transparency, then transparency is improved, but wires remain opaque and can still generate moiré
Solution Approach 1:
The asymmetric Voronoi pattern with irregular cell boundaries and varying wire lengths reduces the periodicity that causes moiré. Even thin wires in this irregular arrangement are less likely to create interference patterns compared to regular grids, improving transparency while minimizing moiré.
Data Source
AI summary
A method for forming a metal mesh pattern is provided. The method includes the operations below. First, at least one pitch of each of mesh base units of a mesh base is determined, and thereby the mesh base is formed. Then, a seed region is set in each of the mesh base units of the mesh base, in which a ratio of an area of each of the seed regions to an area of each of the mesh base units is a constant. Then, a plurality of seeds are generated by randomly selecting a point in each of the seed regions. Finally, the metal mesh pattern is formed, in which the metal mesh pattern is a set of perpendicular bisectors of lines connecting the seeds and their adjacent neighboring seeds.