Capacitive Touch Panel Auxiliary Line Arrangement
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Solution Overview
Problem
Capacitive touch panels face issues with detection failures due to broken fine lines and the occurrence of moiré patterns, particularly when using materials like PEDOT/PSS, which are prone to degradation and have high resistance, and silver paste, which is difficult to visualize and prone to breaking.
Innovation Solution
A capacitive touch panel design featuring X and Y electrodes arranged on opposite surfaces of a transparent base film, with fine lines connected by auxiliary lines that ensure continuous conduction and reduce the risk of breaking, while also reducing the visibility of the fine line pattern through an optimized aperture ratio and arrangement of auxiliary lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fine lines are made narrower to improve resolution, then detection precision is improved, but the lines become more likely to break
Solution Approach 1:
The fine lines are segmented into multiple separate lines within each electrode group (e.g., 3-5 parallel fine lines per electrode). This segmentation allows the electrode to maintain functional integrity even if individual fine lines break, as the remaining lines continue to conduct signals.
Solution Approach 2:
The patent transitions from one-dimensional single-line electrodes to two-dimensional arrays of multiple fine lines. By arranging multiple narrow lines in parallel within each electrode group, the design achieves both high resolution (narrow individual lines) and high reliability (multiple redundant paths).
2Reliability
If multiple fine lines are combined into bundles to prevent breaking, then reliability is improved, but moiré patterns occur
Solution Approach 1:
The patent introduces asymmetry in the arrangement of fine lines by adding auxiliary lines at irregular intervals and positions between the main fine lines. This asymmetric, non-periodic arrangement disrupts the regular patterns that cause moiré effects while maintaining the redundancy needed for reliability.
Solution Approach 2:
Auxiliary lines are pre-positioned between the main fine lines to serve as backup conduction paths. These auxiliary lines are strategically placed in advance to ensure that if any main fine lines break, the auxiliary lines can maintain electrode functionality, thereby preventing detection failures before they occur.
3Ease of manufacture
If long continuous wiring lines are used to extend across the panel, then manufacturing simplicity is improved, but the likelihood of breaking increases
Solution Approach 1:
Long continuous wiring lines are segmented into multiple shorter fine lines arranged in parallel. Each fine line is shorter and less prone to breaking, while collectively they span the required distance. This segmentation maintains manufacturing simplicity by using standard printing techniques while dramatically improving reliability through redundancy.
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
The design effectively eliminates detection failures caused by broken lines and minimizes the occurrence of moiré patterns, maintaining sensing accuracy and visibility while using a more robust and less expensive material than ITO.
Implementation Method 1
capacitive touch panel that can be used as an electrostatic sensor
Data Source
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AI summary
To provide a capacitive touch panel in which the likelihood that a detection failure may be caused by breaking of a line is eliminated and a moire pattern is unlikely to be seen. A capacitive touch panel includes a transparent insulator 11, X electrodes 12 arranged on one surface of the insulator and each including X fine lines 13, Y electrodes 14 arranged on the other surface of the insulator and each including Y fine lines 15, X auxiliary lines 13a each connecting adjacent X fine lines, and Y auxiliary lines 15a each connecting adjacent Y fine lines. The auxiliary lines 13a and 15a are located on diagonals of cells L, which are defined by the X fine lines 13 and the Y fine lines 15 and are arranged in a matrix of rows and columns. The X auxiliary lines 13a and the Y auxiliary lines 15a are arranged without overlapping or being superposed on each other. Each of the rows and the columns includes at least one cell having either the X auxiliary line 13a or the Y auxiliary line 15a and at least one cell having neither the X auxiliary line 13a nor the Y auxiliary line 15a. The rows substantially include no row that has neither the X auxiliary line 13a nor the Y auxiliary line 15a, and the columns substantially include no column that has neither the X auxiliary line 13a nor the Y auxiliary line 15a.