Array Substrate Touch Signal Line Routing for Trace Mura Reduction
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Solution Overview
Problem
Liquid crystal display devices using pseudo dual-domain technology suffer from trace mura phenomena due to interference from touch signal lines, leading to poor display effects and touch accuracy issues.
Innovation Solution
The array substrate design includes alternately arranged sub-pixels with different transmittances and specially oriented touch signal lines with straight-line and fold-line portions, which minimize interference with liquid crystal molecules, reducing trace mura and improving display quality and touch precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch signal lines are arranged in conventional layouts, then touch functionality is achieved, but trace mura phenomena occur due to interference with liquid crystal molecules
Solution Approach 1:
The touch signal lines are designed with different geometric configurations (straight-line portions and fold-line portions) in different regions of the display panel. The fold-line portions are specifically oriented to reduce interference with liquid crystal molecules in areas prone to trace mura, while maintaining touch functionality. This local differentiation allows the system to achieve both reliable touch detection and reduced display defects.
Solution Approach 2:
The touch signal lines employ asymmetric routing with fold-line portions that are not perpendicular to scan lines, creating unequal path lengths and orientations across different regions. This asymmetric design prevents uniform interference patterns that cause trace mura, while still maintaining adequate touch signal transmission for reliable touch detection.
2Manufacturing precision
If sub-pixels are arranged with alternating transmittances, then display quality is improved, but device complexity increases
Solution Approach 1:
The display panel is segmented into different types of sub-pixels (first type with higher transmittance and second type with lower transmittance) that are alternately arranged in columns. This segmentation allows different regions to serve different display quality functions, improving overall image uniformity and reducing mura effects while maintaining a systematic, manufacturable pattern.
Solution Approach 2:
The patent combines multiple design elements into a unified sub-pixel structure: alternating transmittance patterns, misaligned arrangements within columns, and integration with the touch signal line geometry. This merging creates a coordinated system where all elements work together to reduce trace mura while managing the complexity through standardized repeating units.
3Area of stationary object
If touch signal lines are made longer to cover more area, then touch coverage is improved, but parasitic capacitance increases
Solution Approach 1:
The touch signal lines incorporate fold-line portions with curved or angled geometries instead of simple straight extensions. These folded configurations allow the signal lines to cover larger display areas and maintain better geometric relationships with liquid crystal molecules, thereby reducing parasitic capacitance effects while extending touch coverage to more of the display surface.
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 configuration enhances display effect by reducing trace mura and parasitic capacitance, while improving touch precision and reducing the occurrence of bad touches in liquid crystal display devices.
Implementation Method 1
an in-plane switching (IPS) technique and a fringe field switching (FFS) technique are two commonly used wide viewing angle liquid crystal display techniques, characterized in that pixel electrodes and common electrodes are arranged in a same substrate such that liquid crystal molecules deflect in a plane parallel to the substrate so as to improve transmittance of a liquid crystal layer
Implementation Method 2
This configuration enhances display effect by reducing trace mura and parasitic capacitance, while improving touch precision and reducing the occurrence of bad touches in liquid crystal display devices
Data Source
AI summary
An array substrate includes a substrate; scan lines and data lines arranged on the substrate and intersecting one another to define sub-pixels, each of which includes a pixel electrode including strip-like electrodes whose long axes of a same row are parallel to one another. Extension lines of long axes of strip-like electrodes in sub-pixels in any two adjacent rows intersect one another. The touch electrode is electrically connected to at least one touch signal line. Each touch signal line includes straight-line portions and fold-line portions. Two adjacent straight-line portions are connected by one fold-line portion. Any straight-line portion is parallel to long axes of strip-like electrodes in sub-pixels in a same row. Extension lines of fold-line portions intersect long axes of strip-like electrodes. Orthographic projections of fold-line portions on the substrate overlap orthographic projections of scan lines on the substrate. Fold-line portions are not perpendicular to scan lines.