Zigzag Touch Electrodes for Moiré Prevention
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Solution Overview
Problem
Existing touch panels suffer from a moiré phenomenon and visibility defects due to interference with diffusion films or thin film transistor arrays when touch electrodes are overlapped, particularly in densely formed single-layer configurations.
Innovation Solution
The touch panel employs single-layer type touch electrodes formed as zigzag lines with alternating inclinations, accompanied by an overcoating layer also in zigzag form, which are symmetrical and alternately disposed to prevent moiré interference and visibility issues, using transparent conductive materials like indium tin oxide and organic insulating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes are densely formed to increase resolution, then the degree of resolution is improved, but a moiré phenomenon occurs due to interference with pixel patterns
Solution Approach 1:
The patent applies asymmetry by configuring touch electrodes in a zigzag pattern rather than regular parallel lines. The electrodes include first unit electrodes inclined at a first angle and second unit electrodes inclined at a second angle (different from the first), creating an asymmetric arrangement that disrupts the periodicity causing moiré effects while maintaining high resolution through dense electrode configuration
2Object-affected harmful factors
If electrode lines are inclined and bent to prevent moiré phenomenon, then the moiré phenomenon is prevented, but visibility defects occur where electrode lines are recognized as line forms
Solution Approach 1:
The patent applies local quality by creating non-uniform electrode configurations with varying inclination angles in different regions. The touch electrodes transition between different inclination angles (first angle for first unit electrodes, second angle for second unit electrodes) along the display surface, creating local variations that prevent both moiré phenomena and visible line patterns by disrupting uniformity at the local level
3Reliability
If two layers of transparent conductive film are used for X-axis and Y-axis signals, then sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by configuring a single layer of transparent conductive film to perform multiple functions. The zigzag-patterned touch electrodes are designed to sense both X-axis and Y-axis touch signals simultaneously through their inclined configurations, eliminating the need for separate transparent conductive film layers for different axes and reducing overall device complexity
Data Source
AI summary
A touch panel may include: a substrate; touch electrodes formed on the substrate as zigzag lines consisting of first unit electrodes disposed to be inclined in one direction with respect to a first axis that is parallel to one side of the substrate and second unit electrodes disposed to be inclined in the other direction with respect to the first axis, the first unit electrodes and second unit electrodes being disposed to alternate each other consecutively in a direction of the first axis; and overcoating layer formed as zigzag lines consisting of first overcoating members disposed to be inclined in a direction intersecting with the first unit electrodes, and second overcoating members disposed to be inclined in a direction intersecting with the second unit electrodes, the first overcoating members and second overcoating members disposed to alternate each other consecutively in the direction of the first axis.