Touch Sensor Control Line Layout for Low-Noise Display Detection
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Solution Overview
Problem
Existing touch detection devices face challenges in reducing noise and degradation of touch detection performance due to overlapping control lines in the non-detection areas, which can lead to coupling capacitance and interference.
Innovation Solution
The design includes first and second control lines that overlap at specific angles and with reduced width, minimizing parallel overlap areas and using a staggered or inclined layout to prevent unnecessary coupling, thereby stabilizing touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control lines are provided in the non-detection area to connect detection electrodes, then electrical connection is achieved, but coupling capacitance and noise increase due to overlapping lines
Solution Approach 1:
The patent transitions from a two-dimensional planar layout to a three-dimensional stacked architecture. Control lines are routed through different layers (first control lines in one substrate layer, second control lines in another substrate layer), allowing them to overlap in the planar view while being separated vertically by an insulating layer, thus eliminating harmful coupling capacitance while maintaining electrical connection functionality
Solution Approach 2:
An insulating layer is introduced as an intermediary between the first control lines and second control lines. This insulating layer acts as a mediator that physically separates the two sets of control lines, preventing direct electrical coupling and reducing noise interference while still allowing both sets of lines to coexist in the overlapping region
2Device complexity
If control lines are routed through the non-detection area, then device integration is improved, but touch detection accuracy degrades due to line overlap interference
Solution Approach 1:
The patent uses vertical layering to achieve high device integration. Multiple control line sets are stacked in different substrate layers, allowing dense routing in the non-detection area without planar overlap interference. This three-dimensional arrangement enables better integration while maintaining touch detection accuracy by separating signal paths vertically
Solution Approach 2:
The control line routing is segmented into different functional groups: first control lines connected to first detection electrodes and second control lines connected to second detection electrodes. These segmented control line sets are placed in different substrate layers, allowing independent optimization of each routing path while reducing mutual interference and improving overall detection accuracy
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 layout reduces coupling capacitance and noise, ensuring stable and effective touch detection performance across the entire detection area.
Implementation Method 1
overlapping control lines in the non-detection areas, which can lead to coupling capacitance and interference
Data Source
AI summary
According to one embodiment, a touch detection device includes first detection electrodes in a detection area, second detection electrodes in the detection area, extending to intersect the first detection electrodes, first control lines connected to the first detection electrodes, respectively, and provided in a non-detection area, and second control lines connected to the second detection electrodes, respectively, and provided in the non-detection area. The second control lines overlap the first control lines at a plurality of positions as seen in plan view, such that areas of overlapping portions in which the first control lines overlap the second control lines are substantially equalized.