Divided Electrode Touch Panel for Uniform Potential
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Solution Overview
Problem
Designing and manufacturing 5-wire touch panels with T-shaped electrodes is challenging due to variations in size and requires significant effort, leading to distortion of equipotential lines and a limited usable area.
Innovation Solution
The touch panel features linearly arranged divided electrodes with a controlled ratio and uniform gaps, providing a moderate resistance to minimize equipotential line distortion and increase the usable area by eliminating unnecessary electrode protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If T-shaped electrodes are used to prevent equipotential line distortion, then measurement precision is improved, but device complexity increases and manufacturing becomes difficult
Solution Approach 1:
The electrode is divided into multiple segments along its length, with each segment having a different width. This segmentation allows the electrode to provide uniform potential distribution without requiring complex T-shaped designs, thereby simplifying manufacturing while maintaining measurement precision.
Solution Approach 2:
Different portions of the electrode have different widths to create specific electrical characteristics. The varying width along the electrode length allows for localized control of potential distribution, achieving uniform equipotential lines without complex overall geometry.
2Measurement precision
If T-shaped electrodes protrude inward to the resistive film, then equipotential line distortion is reduced, but the usable area of the resistive film decreases
Solution Approach 1:
The electrode is segmented into multiple sections with varying widths, allowing the electrode to maintain uniform potential distribution without protruding inward. This segmentation enables the electrode to stay at the periphery while achieving the desired electrical characteristics.
Solution Approach 2:
The width parameter of the electrode is varied along its length rather than maintaining a constant width or protruding shape. This parameter change allows the electrode to provide uniform potential distribution while minimizing intrusion into the usable area of the resistive film.
3Measurement precision
If electrode shapes are determined by trial and error, then equipotential line distortion is minimized, but manufacturing time and effort increase significantly
Solution Approach 1:
The electrode is designed with a predetermined segmented structure with specific width ratios, eliminating the need for trial and error. This standardized segmentation provides a ready-to-manufacture design that ensures uniform equipotential lines without requiring iterative shape optimization.
Solution Approach 2:
Specific parameter ranges are defined for the electrode width ratios (0.3-0.7, preferably 0.4-0.6), providing clear manufacturing specifications that eliminate trial and error. These parameter definitions enable direct manufacturing with consistent results.
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 design simplifies the creation and manufacturing of touch panels, reduces equipotential line distortion, and increases the usable area by standardizing gap widths and resistance values, making it easier to accurately determine touch coordinates.
Implementation Method 1
transparent rectangular resistive films 14 are laminated on opposing surfaces of two substrates 12a and 12b, respectively
Implementation Method 2
A positive voltage is applied to both ends of the first electrode 56a and a negative voltage is applied to both ends of the second electrode 56b, so that a potential gradient is formed between the first electrode 56a and the second electrode 56b
Data Source
AI summary
In a touch panel, a rectangular resistive film is formed on a substrate and electrodes are provided along the four sides of the resistive film. Each electrode includes a plurality of gaps and a plurality of divided electrodes. The divided electrodes are linearly arranged along the corresponding side of the resistive film, and the electrode, in which the divided electrodes at both ends are connected to terminals, respectively, is formed by arranging the divided electrodes of the same shape and repeating this same shape.