Multi-touch Panel Strip Electrode Width Compensation
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Solution Overview
Problem
Conventional multi-touch panels experience equipotential line distortion due to differences in circuit resistance caused by varying lengths of wiring circuits, leading to complex and time-consuming correction processes, especially in larger panels where resistance differences are exacerbated.
Innovation Solution
The multi-touch panel incorporates strip electrodes with narrowed width portions at their ends, connected to drawing wires of varying lengths, allowing for adjusted resistance by altering the width of electrode connection paths to maintain an equipotential line without distortion, even with different wire lengths across input areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wiring circuits connect FPC to parallel circuits with different lengths for different input areas, then the multi-touch panel can accommodate various input areas, but circuit resistance differences increase causing equipotential line distortion
Solution Approach 1:
The patent applies local quality by varying the width of strip electrodes at different locations to compensate for different wiring circuit lengths. Specifically, strip electrodes connected to parallel circuits farther from the FPC have larger widths than those closer to the FPC, creating location-specific resistance compensation that maintains uniform equipotential lines across different input areas.
Solution Approach 2:
The patent changes the physical parameter of strip electrode width to adjust and equalize circuit resistance. By modifying the width parameter of strip electrodes at different positions, the invention compensates for the resistance differences caused by varying wire lengths, thereby maintaining equipotential line accuracy without requiring complex correction procedures.
2Manufacturing precision
If the width of circuits is increased to reduce resistance differences, then equipotential line distortion is reduced, but the frame portion size must be enlarged
Solution Approach 1:
Instead of uniformly increasing circuit width across the entire panel, the patent applies local quality by selectively widening only specific strip electrodes that require resistance compensation. This targeted approach reduces resistance differences in critical areas while minimizing the overall frame portion area increase.
Solution Approach 2:
The patent segments the circuit width adjustment into individual strip electrodes rather than increasing the width of all circuits uniformly. Each strip electrode's width can be independently optimized based on its specific resistance compensation needs, allowing precise control over resistance equalization while minimizing unnecessary material usage and frame size increase.
3Manufacturing precision
If conventional correction methods are used for each input area, then equipotential line distortion is corrected, but correction tasks become complicated and time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-configuring strip electrodes with specific width variations during manufacturing to inherently compensate for resistance differences. This built-in compensation eliminates the need for complex post-manufacturing correction procedures for each input area, significantly simplifying the correction process while maintaining high equipotential line 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 configuration simplifies the correction of equipotential line distortion, ensuring an ideal equipotential line across the panel, regardless of wire length differences, thereby reducing correction complexity and time, and is applicable to both end- and center-located FPC configurations.
Implementation Method 1
circuit resistance increases as the circuit length is longer. Therefore, there are generated differences in resistance among the respective wiring circuits
Data Source
AI summary
A multi-touch panel includes a first substrate for receiving coordinate input, a second substrate provided to face the first substrate, a first conductive film formed on the first substrate; and a second conductive film formed on the second substrate. At least one of the first conductive film and the second conductive film is divided into a plurality of strip regions to configure a plurality of strip electrodes. At least one end of each of the strip electrodes has a narrowed width portion, and the strip electrodes have widths different from one another at the narrowed width portion in accordance with lengths of the drawing wires that are connected to the ends provided with the narrowed width portions.