Touch Display Wiring Layer Separation for Short Circuit Prevention
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Solution Overview
Problem
Existing touch display devices face challenges in manufacturing due to the proximity of touch signal lines and data lines, leading to a high risk of residual conductive material and short circuits during the etching process, which results in defective grid lines and reduced yield.
Innovation Solution
The display substrate design includes touch signal lines with first and second touch portions in different layers, where the second touch portions are of the same material and layer as the data lines, reducing the proximity of wirings in the same layer and allowing for separate patterning processes, thereby minimizing the risk of residual conductive material and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch signal lines are placed adjacent to data lines to reduce wiring complexity, then device complexity is reduced, but the risk of residual conductive material and short circuits increases during etching
Solution Approach 1:
The patent applies dimensionality change by transitioning from a single-layer wiring layout to a multi-layer structure. Touch signal lines are routed in a first layer while data lines are routed in a second layer, vertically separating the previously adjacent lines. This layered approach maintains the compact layout benefits while eliminating the short circuit risk by placing conductors in different spatial dimensions.
Solution Approach 2:
The patent segments the wiring into distinct layers, separating touch signal lines and data lines into different conductive planes. This segmentation allows independent patterning and etching processes for each layer, preventing residual conductive material from causing short circuits between touch and data lines while maintaining overall wiring efficiency.
2Ease of manufacture
If touch signal lines and data lines are patterned in the same layer to simplify the manufacturing process, then ease of manufacture is improved, but manufacturing precision deteriorates due to residual conductive material
Solution Approach 1:
The patent resolves the manufacturing precision issue by moving touch signal line patterning to a different layer than data lines. This vertical separation in the layer dimension enables independent etching processes, eliminating the interference and residual conductive material problems that occur when both line types are patterned in the same layer.
Solution Approach 2:
The patent implements preliminary action by forming the touch signal line pattern in an earlier layer before the data line pattern is created in a subsequent layer. This sequential, layered approach allows each patterning step to be optimized independently, ensuring high manufacturing precision without the constraints of simultaneous same-layer patterning.
3Area of stationary object
If touch signal lines are placed close to data lines to reduce area occupation, then area efficiency is improved, but the probability of defective grid lines increases
Solution Approach 1:
The patent achieves compact area utilization while preventing grid line defects by routing touch signal lines and data lines in different layers. This vertical stacking allows the wiring to occupy minimal planar area while maintaining sufficient separation distance through the layer dimension, thereby eliminating the defect-prone close-proximity configuration in the same layer.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes: a base substrate and a plurality of sub-pixels distributed in arrays and provided on the base substrate. And the plurality of sub-pixels is divided into a plurality of sub-pixel columns. The display substrate further includes: a plurality of data lines, each of which is coupled to respective sub-pixels at a corresponding sub-pixel column; a plurality of touch electrodes and a plurality of touch signal lines coupled to corresponding touch electrodes. Specifically an orthogonal projection of each of the touch signal lines on the base substrate is adjacent to an orthogonal projection of a corresponding data line among the plurality of data lines on the base substrate, and each of the touch signal lines comprises first touch portions and second touch portions coupled to each other, the first touch portions and the second touch portions being arranged in different layers, and the second touch portions being of the same material and provided in a same layer as the data lines.