Array Substrate Touch-Line Staggering for Pixel-Edge Light Leakage
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Solution Overview
Problem
Existing touch display technologies face issues with abnormal liquid crystal orientation and poor light leakage at pixel edges due to the layout of touch signal lines, particularly when they are arranged in layers, leading to increased capacitance and resistance.
Innovation Solution
The array substrate design includes staggered arrangement of upper and lower touch signal lines, with specific edge distances and widths, and the use of overlapping electrodes to maintain electrical connectivity without increasing line width, thereby reducing capacitance and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch signal lines are arranged in layers with upper and lower lines, then electrical connectivity is improved, but capacitance and resistance increase
Solution Approach 1:
The patent transitions from a single-layer touch signal line arrangement to a multi-layer staggered arrangement. The upper touch signal line is positioned in a different layer (above) than the lower touch signal line, creating a three-dimensional spatial configuration. This dimensional change allows electrical connectivity to be maintained while reducing capacitance and resistance by optimizing the spatial relationship between signal lines and pixel electrodes.
Solution Approach 2:
The upper and lower touch signal lines are arranged in an asymmetric staggered configuration rather than a symmetric aligned pattern. The horizontal positions of the upper and lower lines are deliberately offset, creating an asymmetric layout that reduces parasitic capacitance and resistance while maintaining effective electrical connectivity to the pixel electrodes.
2Area of stationary object
If touch signal lines are positioned close to data lines for compact layout, then area is reduced, but liquid crystal orientation becomes abnormal and light leakage occurs
Solution Approach 1:
The patent applies different spatial positioning strategies to different segments of the touch signal lines. The upper and lower touch signal lines are positioned at different horizontal locations (staggered arrangement), creating local variations in spacing relationships. This allows the layout to be compact in some areas while maintaining adequate distance from data lines in critical regions to prevent liquid crystal orientation abnormalities and light leakage.
Data Source
AI summary
This disclosure provides an array substrate and a preparation method thereof as well as a touch display device. The array substrate includes: a substrate; a plurality of gate lines and a plurality of data lines located on the substrate, wherein the plurality of gate lines extend along a first direction and are arranged in a second direction different from the first direction, the plurality of data lines extend in the second direction and are arranged in the first direction, the plurality of gate lines intersect with the plurality of data lines to define a plurality of pixel areas; and a plurality of touch signal lines located on the substrate, wherein the plurality of touch signal lines extend in the second direction, each of the plurality of touch signal lines comprises a lower touch signal line and an upper touch signal line, and an edge of the upper touch signal line is spaced apart from an edge of the lower touch signal line in the first direction.