Touch Panel Iso-Resistance Pattern for Accurate Signal Detection
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Solution Overview
Problem
Conventional touch panels experience resistance deviation in sensor signal lines due to varying lengths and widths, leading to accuracy issues in touch detection, and require design changes when the touch drive IC is relocated.
Innovation Solution
A touch panel with an iso-resistance compensation pattern that includes dummy signal lines to match resistance within allowable tolerances, formed by disconnecting portions of sensor signal lines, and using multiplexing to connect sensor signal lines to a common terminal, maintaining consistent resistance despite IC relocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor signal lines have different lengths and widths to connect touch electrodes to the touch drive IC, then the touch drive IC can be placed flexibly and the touch panel can be manufactured, but resistance deviation occurs among sensor signal lines leading to inaccurate touch detection
Solution Approach 1:
The patent applies local quality by adding dummy signal lines specifically to sensor signal lines that have lower intrinsic resistance (shorter or wider lines). This creates a non-uniform structure where each signal line receives compensation tailored to its specific resistance characteristics, thereby equalizing the total resistance across all signal lines in the row while maintaining flexible IC placement
Solution Approach 2:
The patent changes the resistance parameter of sensor signal lines by adding dummy signal lines with specific widths and lengths. By adjusting the width and length parameters of these dummy lines, the total resistance of each sensor signal line is modified to achieve resistance equalization across all lines in the same row, resolving the accuracy issue while preserving IC placement flexibility
2Measurement precision
If sensor signal line widths are varied to compensate for resistance deviation, then touch detection accuracy improves, but design complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent segments the signal line into two independent parts: the original sensor signal line and an added dummy signal line. This segmentation allows the dummy line to be designed and manufactured separately with standard width, avoiding the need to manufacture the entire signal line with variable widths. The two segments are connected in parallel to achieve resistance compensation while simplifying manufacturing
Solution Approach 2:
The dummy signal line acts as an intermediary element that mediates the resistance imbalance. Instead of modifying the original sensor signal line geometry, the dummy line serves as an intermediate component that, when connected in parallel, adjusts the total resistance to match the target value, thereby improving accuracy without increasing manufacturing complexity
3Measurement precision
If dummy signal lines are added to compensate for resistance deviation, then resistance equalization is achieved, but the number of signal line elements increases
Solution Approach 1:
The patent merges the sensor signal line and dummy signal line in parallel connection to achieve resistance equalization. By combining these two conductive paths, the total resistance is reduced and equalized across all signal lines in the row. This merging approach achieves resistance compensation without requiring separate independent circuits, thereby limiting the increase in device complexity
Data Source
AI summary
The present invention relates to a touch panel having a resistive compensation pattern. According to an embodiment of the invention, the touch panel includes: a plurality of touch electrodes arranged in a matrix of multiple rows and multiple columns; a plurality of sensor signal lines each connected to a corresponding one of the touch electrodes; and a touch drive integrated circuit (IC) configured to analyze a touch signal of the touch electrode transmitted through the sensor signal line to determine whether the touch electrode is touched, wherein a dummy signal line is constituted in at least one of the sensor signal lines to match resistance of the sensor signal lines belonging to the same row within an allowable tolerance. The present invention also includes embodiments different from the above embodiment.