Array Substrate Second Touch Lines Resistance Uniformity
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Solution Overview
Problem
The existing array substrate configuration results in poor display effects due to significant resistance differences between touch lines connected to top and bottom common electrodes, which are not effectively eliminated by shorting through switch elements and test lines, particularly affecting large-sized display panels.
Innovation Solution
The array substrate design includes a display region with common electrode units connected to both first and second touch lines, where the second touch lines are parallel to gate electrode lines and connected through via holes, and a frame region with first switches and test lines to short circuit common electrodes during display, ensuring uniform resistance across touch lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If touch lines extend along the longer side (direction Y) to connect common electrodes, then the array substrate can accommodate large-size display panels, but the resistance difference between top and bottom touch lines becomes significantly larger
Solution Approach 1:
The patent segments the single touch line path into two directions by introducing second touch lines extending along the shorter side (direction X). This divides the original long-path connection into multiple shorter paths, reducing the resistance difference between different common electrode connections.
Solution Approach 2:
The patent adds a new dimension to the touch line layout by introducing second touch lines that extend along the shorter side (direction X), perpendicular to the first touch lines extending along the longer side (direction Y). This creates a two-dimensional grid-like connection structure that balances the resistance distribution.
2Ease of manufacture
If switch elements and test lines are used to short common electrodes, then manufacturing flexibility is improved, but the resistance difference between touch lines cannot be effectively eliminated
Solution Approach 1:
The patent segments the resistance imbalance problem by introducing second touch lines that provide alternative shorter paths for current flow. This creates multiple parallel conduction paths that balance the overall resistance distribution across the array substrate.
Solution Approach 2:
The patent changes the geometric parameters of the touch line network by adding lines in the shorter direction (direction X). This alters the resistance parameters of the system, transforming the resistance distribution from highly uneven to more uniform across different common electrode connections.
3Device complexity
If only first touch lines along the longer side are used, then device complexity is reduced, but display accuracy deteriorates due to large resistance differences
Solution Approach 1:
The patent introduces second touch lines extending along the shorter side (direction X), adding a new dimension to the previously one-dimensional (along direction Y only) touch line configuration. This creates a two-dimensional network that reduces resistance differences while maintaining manageable complexity.
Data Source
AI summary
The present disclosure provides an array substrate including a display region and a frame region surrounding the display region. The display region further includes a plurality of second touch lines which are in parallel with the gate electrode lines, and each of the common electrode units is electrically connected to one of the second touch lines through a via hole. The frame region consists of a plurality of first switches and a plurality of test lines extending along a second direction, at least one end of each second touch line is connected to one of the first switches, and the test lines are electrically connected to the first switches.