Touch Module Cutting Patterns Alleviate Mura Phenomenon
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Solution Overview
Problem
The Mura phenomenon, or moiré phenomenon, occurs in touch modules with metal mesh electrodes due to differences in patterns between the bridging and boundary regions, causing optical issues in OLED display devices, such as dot or block Mura in dark states and brightness differences at different azimuths in bright states.
Innovation Solution
The touch module design incorporates a bridging region with a first cutting pattern and a boundary region with a second cutting pattern, where both patterns are substantially the same, ensuring consistent contour and shape similarity, thereby alleviating the Mura phenomenon by maintaining uniform cutting opening densities and pattern morphologies across the bridging and boundary regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different cutting patterns are used in the bridging region and boundary region, then the electrical connection and electrode definition are achieved, but the Mura phenomenon occurs due to pattern differences
Solution Approach 1:
The patent applies local quality by designing different cutting patterns for different regions: the bridging region uses a first cutting pattern optimized for electrical connection between touch electrodes, while the boundary region uses a second cutting pattern optimized for electrode definition and isolation. This localized differentiation resolves the contradiction by allowing each region to have the specific pattern quality it needs for its function, rather than using a uniform pattern throughout.
Solution Approach 2:
The patent segments the touch module into distinct regions (bridging region and boundary region) with different cutting patterns. This segmentation allows the bridging region to focus on electrical connectivity while the boundary region focuses on precise electrode boundaries, resolving the Mura phenomenon caused by attempting to use a single uniform pattern for both functions.
2Object-affected harmful factors
If uniform cutting patterns are used across all regions, then the Mura phenomenon is reduced, but the electrical connection and electrode definition may be compromised
Solution Approach 1:
Rather than using uniform patterns everywhere, the patent applies local quality by tailoring the cutting pattern to the specific functional requirements of each region. The bridging region gets a pattern optimized for electrical connection, while the boundary region gets a pattern optimized for electrode definition, thus maintaining both Mura reduction and functional reliability through localized optimization.
3Object-affected harmful factors
If the cutting patterns in bridging and boundary regions are made substantially the same, then optical uniformity is improved, but the area of cutting openings must be increased to maintain electrical performance
Solution Approach 1:
The patent resolves this contradiction by applying local quality - allowing different cutting patterns in different regions rather than forcing uniformity. The bridging region can use a pattern with larger openings optimized for electrical connection, while the boundary region uses a pattern with smaller openings optimized for optical uniformity, thus eliminating the need to increase overall cutting opening area.
Data Source
AI summary
The present disclosure provides a touch module, a manufacturing method thereof, and a touch display device. The touch module includes: a base substrate; an array of touch units arranged on the base substrate. Each touch unit includes a first touch electrode extending along a first direction and two second touch electrodes arranged on two sides of the first touch electrode along a second direction, the first direction and the second direction intersecting each other; wherein, the touch unit further includes: a bridging region between the two second touch electrodes, and a boundary region between the first touch electrode and each of the second touch electrodes. The bridging region includes a first cutting pattern, the boundary region includes a second cutting pattern, and the first cutting pattern and the second cutting pattern are substantially the same.