Touch Display Routing Lines Uniform Resistance
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Solution Overview
Problem
In touch display devices, routing lines connected to touch electrodes have varying lengths, leading to different resistance values, which cause variations in RC delay values of touch signals, deteriorating touch performance.
Innovation Solution
The routing lines in a touch display device are formed in different shapes and lengths, specifically in zigzag patterns in non-active areas, to ensure uniform resistance values, with display signal links and routing lines having distinct shapes and configurations to achieve consistent resistance across the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If routing lines are connected to touch electrodes at different positions, then the touch sensor can detect contact positions across the display, but the routing lines have different lengths and resistance values causing RC delay variation
Solution Approach 1:
The patent applies local quality by configuring routing lines with different shapes and lengths in different regions of the non-active area. Specifically, routing lines connected to touch electrodes in different positions are designed with varying geometries (e.g., different numbers of zigzag patterns, different path lengths) to compensate for position-dependent resistance differences, ensuring that all routing lines achieve substantially the same resistance value and RC delay characteristics
Solution Approach 2:
The patent changes geometric parameters of routing lines (length, shape, number of zigzag patterns) to adjust and equalize their resistance values. By modifying these physical parameters based on the position of touch electrodes, the invention achieves uniform RC delay across all touch signal paths while maintaining comprehensive touch detection coverage
2Manufacturing precision
If routing lines are made to have the same resistance value by adjusting their lengths and shapes, then RC delay uniformity is improved, but the routing lines occupy more area in the non-active region
Solution Approach 1:
The patent utilizes the two-dimensional non-active area by routing lines through both horizontal and vertical directions, employing zigzag patterns that efficiently fill space. This dimensional approach allows routing lines to achieve equal resistance values while occupying the available non-active area in a compact and organized manner, preventing excessive area consumption
Data Source
AI summary
A touch display device in which routing lines are formed to have the same resistance value. Routing lines connected to touch electrodes in a non-active area and display signal links electrically connected to a light-emitting element are formed in different shapes from each other, and the lengths of at least one of zigzag patterns of the routing lines disposed in the non-active area and single-line regions are formed differently.