Touch Panel Mesh Electrode Pattern Design for Moire Reduction
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Solution Overview
Problem
Existing touch panels face challenges in designing a repeat arrangement of electrode wires with a small design load while avoiding moire interference, especially with the increasing resolution and complexity of display devices, which leads to higher costs and reduced producibility.
Innovation Solution
The touch panel features a mesh pattern with drive and sensing electrodes comprising linear main and auxiliary electrode wires, where the wires intersect and connect across nodes with varying pitches and angles, allowing for a repeat arrangement that reduces design constraints and avoids moire interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a repeat arrangement of electrode wires is designed with high resolution and complexity, then detection precision is improved, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The electrode wire arrangement is segmented into a standardized repeat unit that can be tiled across the touch panel. This segmentation allows high-resolution detection to be achieved through repetition of a manageable pattern rather than designing an entirely complex unique pattern, thus improving detection precision while controlling device complexity.
Solution Approach 2:
The patent applies parameter changes by varying the pitch and angle of electrode wires within the repeat unit to optimize detection precision. By adjusting these parameters within the standardized structure, high-resolution detection is achieved without proportionally increasing overall device complexity.
2Object-affected harmful factors
If electrode wires are arranged to avoid moire interference, then harmful factors are reduced, but design freedom is constrained and manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetry in the electrode wire arrangement within the repeat unit, where wires are positioned at specific non-uniform intervals and angles. This asymmetric design effectively prevents moire interference patterns while maintaining a manageable structure that doesn't excessively increase manufacturing precision requirements.
Solution Approach 2:
The patent addresses moire interference by introducing angular variation as an additional dimension in the electrode wire arrangement. Instead of only varying wire spacing in one dimension, wires are arranged at different angles, which disrupts the formation of moire patterns while keeping the repeat unit design manageable.
3Ease of manufacture
If a standardized repeat unit is used for electrode arrangement, then ease of manufacture is improved, but design freedom is reduced
Solution Approach 1:
The standardized repeat unit serves multiple functions: it enables easy manufacturing through repetition, provides moire prevention through its specific asymmetric structure, and allows detection precision optimization through parameter variations. This multi-functionality resolves the contradiction by making the standardized unit adaptable to different design requirements.
Solution Approach 2:
Within the standardized repeat unit framework, design freedom is maintained through the ability to change parameters such as wire pitch, wire angle, and node positioning. These parameter variations allow the same standardized structure to be adapted for different touch panel specifications without sacrificing manufacturing ease.
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
This approach enables a touch panel with reduced design load and high pattern design freedom, effectively preventing moire and improving the producibility and display quality of touch panels in high-resolution devices.
Implementation Method 1
Capacitive coupling touch panel devices have become mainstream in recent times... when an external conductor (a finger, stylus pen, etc.) for which the position is to be detected is placed in contact (proximity) through a dielectric material, parasitic capacitance produced by the external conductor is newly generated and the electrostatic capacity changes.
Data Source
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AI summary
[Problem] The problem addressed by the present invention lies in providing a touch panel which enables a repeat arrangement with a small design load, and also allows a mesh pattern to be designed with a high degree of freedom and does not generate moire, and also in providing a display device comprising same. [Solution] A touch panel in which a drive electrode pattern/sensing electrode pattern comprise: a plurality of first main electrode wires/second main electrode wires constituting line segments having a linear shape extending along a first wire direction/second wire direction; and a plurality of first auxiliary electrode wires/second auxiliary electrode wires constituting line segments having a linear shape extending along the second wire direction/first wire direction and joining the plurality of first main electrode wires/second main electrode wires, and respective end points of the first main electrode wires/second main electrode wires are connected to end points of the closest first main electrode wire/second main electrode wire in adjacent nodes, by means of connecting wires having a different angle of inclination from that of the first main electrode wires/second main electrode wires.