Trapezoid Mesh Touch Panel for Moiré Reduction
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Solution Overview
Problem
Touch panels with metal mesh patterns often experience the moiré phenomenon due to regular intersections with display panel or optical film patterns, making sensing cells and lines recognizable to users and causing optical interference.
Innovation Solution
The implementation of zig-zag shaped pattern lines for sensing cells and sensing lines, which are connected by various patterns to prevent the moiré phenomenon and reduce visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If straight line patterns are used for metal mesh sensing cells and sensing lines, then electrical conductivity is improved, but optical interference and moiré phenomenon occur due to regular intersections with display panel or optical film patterns
Solution Approach 1:
The patent applies asymmetry by replacing straight line patterns with trapezoidal patterns for the metal mesh sensing cells and sensing lines. The trapezoidal shape breaks the regular intersection pattern that causes moiré effects, while maintaining electrical connectivity through the geometric configuration of the trapezoids arranged in a grid structure.
Solution Approach 2:
The patent employs curved or angled lines forming trapezoidal shapes instead of straight lines. The non-linear geometry of the trapezoidal patterns disrupts the regular optical interference patterns, reducing moiré phenomenon while preserving the electrical conductivity function of the sensing elements.
2Ease of manufacture
If straight line patterns are used for metal mesh sensing cells and sensing lines, then manufacturing simplicity is maintained, but sensing cells and sensing lines become recognizable to users due to regular arrangement
Solution Approach 1:
The trapezoidal pattern introduces visual asymmetry that makes the sensing elements less recognizable to users compared to simple straight lines. The geometric complexity of trapezoids arranged in a grid provides a more aesthetically pleasing and less obvious pattern while remaining manufacturable through standard photolithography processes.
3Reliability
If regular intersecting patterns are used for metal mesh, then electrical connectivity is ensured, but optical films and display panel patterns experience interference
Solution Approach 1:
The patent uses asymmetric trapezoidal shapes arranged in a regular grid to maintain electrical connectivity across the touch panel. The trapezoidal geometry disrupts the symmetry that causes optical interference with display panel pixels and optical films, while the regular arrangement ensures continuous electrical pathways for sensing functionality.
Data Source
AI summary
A touch panel including a sensing cell and a sensing line disposed on a transparent substrate. Each of the sensing cell and the sensing line includes at least one pattern line. The at least one pattern line includes unit patterns, each of the unit patterns including a first line extending in a first direction, a second line connected to the first line and extending in a second direction intersecting the first direction, a third line connected to the first line and extending in a third direction intersecting the first direction, and a fourth line connected to the third line and extending in the first direction. The first line, the second line, the third line, and an extension of the fourth line form a trapezoid. The unit patterns are repeatedly arranged and adjacent unit patterns are connected each other.