Touch Sensor End Strip Electrode Area Ratio Adjustment
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Solution Overview
Problem
In touch sensors, the electrical capacitance at the ends of electrode arrays is often lower than in other areas due to omitted unnecessary electrode parts and deviations in relative position, leading to reduced detection accuracy and inefficient measurement.
Innovation Solution
The end strip electrodes are designed to have a different area ratio compared to other strip electrodes, with a larger total area of electrode wires, ensuring the electrical capacitance is maintained at a similar level to the middle electrodes, preventing it from being smaller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the area where electrodes are arranged is made larger to cover the whole output image, then the detection coverage is improved, but the electrical capacitance at the ends of the electrode array becomes lower than in other areas
Solution Approach 1:
The patent applies local quality by making the end strip electrodes have a different area ratio compared to middle strip electrodes. Specifically, the end strip electrodes have a smaller area ratio of electrode wire total area to strip electrode area, which compensates for the reduced capacitance at the ends and ensures uniform detection performance across the entire electrode array.
2Productivity
If the area where electrodes are arranged is made smaller to reduce unnecessary electrode parts, then the measurement efficiency is improved, but the detection accuracy at the edges is reduced
Solution Approach 1:
The patent makes end strip electrodes have a different area ratio than middle strip electrodes, optimizing the electrode configuration to maintain detection accuracy at edges while minimizing unnecessary electrode parts. This local differentiation allows efficient measurement without sacrificing edge detection performance.
3Area of moving object
If the size of the electrode area is matched to the display panel size, then the coverage is maximized, but the initial value of electrical capacitance becomes inappropriate for detecting small changes
Solution Approach 1:
The patent differentiates the area ratio of end strip electrodes from middle strip electrodes to optimize capacitance distribution. This ensures that the initial capacitance value is appropriate across the entire electrode array, enabling sensitive detection of small capacitance changes while maintaining full coverage.
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 prevents the electrical capacitance at the ends of the electrode arrays from being lower than in other areas, maintaining detection accuracy and reducing unnecessary electrode parts, thus optimizing the touch sensor's performance.
Implementation Method 1
detects contact of a finger or the like on an operation surface as a change in an electrical capacitance between the drive electrode and the sensing electrode
Data Source
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AI summary
Electrodes (21) for a touch sensor have a plurality of strip electrodes (31DP) arranged along an arrangement direction (D1) which is one direction, with spaces therebetween. Each of the strip electrodes (31DP) is an aggregate of a plurality of electrode wires (31L) disposed keeping spaces therebetween. Each total area of the plurality of electrode wires (31L) in a respective strip electrode (31DP) is uniform in the plurality of strip electrodes (31DP), the plurality of strip electrodes (31DP) include an end strip electrode (31DE) and another strip electrode (31 DM) except for the end strip electrode, the end strip electrode being located at least at one end of the arrangement direction (D1), and when a ratio of a total area of the electrode wires (31L) to an area of a respective strip electrode (31DP) is defined as an area ratio in the strip electrode, the area ratio in the end strip electrode (31DE) is different from the area ratio in the other strip electrode (31DM).