Metal Mesh Node Layout to Reduce Grey Spots and Moiré
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Solution Overview
Problem
The existing metal mesh structures in touch panels cause undesired widened patterns due to light diffraction, leading to grey spots and visible moiré patterns, which affect display quality and user experience.
Innovation Solution
A metal mesh structure design featuring ∧-shaped unit patterns arranged in a specific orientation, forming T-shaped nodes with supplementary angles to reduce light diffraction and moiré patterns, utilizing frame-shaped patterns with asymmetrical sides and supplementary angles to minimize node enlargement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rhombic grids with acute angles are used in the metal mesh structure, then the manufacturing process is simpler, but light diffraction causes widened patterns leading to grey spots
Solution Approach 1:
The patent applies asymmetry by changing the node configuration from a symmetric X pattern (four line segments) to an asymmetric T pattern (three line segments). This asymmetric design alters the light diffraction characteristics, preventing the formation of widened patterns and reducing grey spots while maintaining manufacturing simplicity through the same lithography process.
Solution Approach 2:
The patent changes the geometric parameters of the node configuration from acute-angled rhombic grids to configurations with supplementary angles (summing to 180 degrees). This parameter change in the node structure modifies the diffraction pattern, eliminating the widening effect that causes grey spots while preserving the overall mesh structure integrity.
2Ease of manufacture
If rhombic grids are combined with display panel having periodically placed pixels, then the manufacturing process is straightforward, but visible moiré patterns are produced
Solution Approach 1:
The asymmetric T-shaped node design breaks the periodic symmetry that causes moiré interference with the display panel's pixel pattern. By introducing this asymmetry at each node, the metal mesh structure no longer creates regular interference patterns when overlaid with the periodic pixel arrangement, thereby eliminating visible moiré effects.
3Strength
If X pattern nodes with four line segments are used, then the grid structure is more robust, but the node region causes light diffraction and pattern widening
Solution Approach 1:
The patent extracts one line segment from the four-line-segment X pattern node, reducing it to a three-line-segment T pattern. This extraction removes the source of problematic light diffraction at the node while maintaining sufficient structural connectivity and robustness through the remaining three segments, thereby improving pattern accuracy without sacrificing structural integrity.
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 design reduces grey spots and enhances display quality by uniform brightness and reduces moiré patterns, improving electrical performance with lower channel resistance and increased conductivity.
Implementation Method 1
an undesired widened pattern is prone to be formed due to the diffraction of light
Data Source
AI summary
The present invention provides a metal mesh structure including unit pattern columns, with unit patterns repeatedly arranged in a first direction, arranged in a second direction. Each of the unit patterns includes a first frame-shaped pattern and a second frame-shaped pattern, which respectively include a first side, a second side, a third side, and a fourth side, connected to form a ∧-shaped pattern. The first side of the first frame-shaped pattern overlaps the fourth side of the second frame-shaped pattern, the second side of the first frame-shaped pattern meets the fourth side of the second frame-shaped pattern at a node, and the fourth side of the first frame-shaped pattern connects with the first side of the second frame-shaped pattern and shares a same vertex. At the node, two angles, which are supplementary angles to each other, are formed on two sides of the second side of the first frame-shaped pattern.