Touch Sensor Electrode Lattice Pattern for Noise Reduction
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Solution Overview
Problem
Current touch panels face challenges in accurately detecting input positions due to limitations in the design of electrodes and the transparency of dielectric layers, which affect the accuracy and reliability of electrostatic capacitance measurements.
Innovation Solution
The implementation of a touch sensor electrode design featuring a transparent dielectric substrate with specific arrangements of first and second electrodes, including capacitive electrode parts, connecting parts, and dummy parts, forming lattice patterns to enhance sensitivity and noise resistance, while maintaining transparency for image transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transparent dielectric layer is made thinner to improve touch sensitivity, then the sensitivity increases, but the noise interference and measurement accuracy deteriorate
Solution Approach 1:
The electrode structure is segmented into multiple components: capacitive electrode parts for signal generation, connecting parts for electrical connection, and dummy parts for noise cancellation. This segmentation allows each component to perform its specific function optimally while working together to improve overall measurement precision and reduce noise interference.
Solution Approach 2:
The transparent dielectric layer serves as an intermediary between the first and second electrodes, enabling electrostatic capacitance measurement while maintaining transparency. The specific arrangement of electrodes with dummy parts acts as an intermediary mechanism to distinguish actual touch signals from noise interference, improving measurement accuracy.
2Measurement precision
If the electrode arrangement is optimized to improve detection accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
Each electrode is divided into functional segments (capacitive parts and connecting parts), allowing complex detection patterns to be achieved through simple repeated units. This modular segmentation improves detection accuracy while managing structural complexity through standardization.
Solution Approach 2:
The first and second electrodes are combined in a three-dimensional intersection arrangement with specific overlapping patterns. This merging of electrode systems creates a comprehensive detection network that improves input position detection accuracy while sharing common structural elements to manage complexity.
3Illumination intensity
If the transparent dielectric layer maintains high transparency for display quality, then the visual quality improves, but the electrostatic capacitance measurement reliability deteriorates
Solution Approach 1:
The transparent dielectric layer acts as an intermediary that enables both optical transmission and electrical measurement. By optimizing its properties and arranging electrodes with dummy parts on both surfaces, the system maintains high transparency while improving measurement reliability through the dummy parts that cancel noise interference.
Solution Approach 2:
The electrode design parameters (arrangement patterns, dummy part configurations, overlapping areas) are optimized to achieve the right balance between maintaining dielectric layer transparency and ensuring reliable electrostatic capacitance measurement. The dummy parts are specifically configured to improve signal-to-noise ratio without compromising optical properties.
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 improves the accuracy of detecting input positions by increasing sensitivity to touch and reducing noise interference, while maintaining the transparency required for display devices.
Implementation Method 1
A change in the electrostatic capacitance between any one of the plurality of first electrodes and any one of the plurality of second electrodes is detected to determine an input position for the touch panel
Implementation Method 2
Between the plurality of first electrodes and the plurality of second electrodes, there is a transparent dielectric layer having a single-layer structure or a multi-layer structure
Data Source
AI summary
A touch sensor electrode includes a transparent dielectric substrate, first electrodes each including first capacitive electrode parts, second electrodes each including second capacitive electrode parts, first dummy parts each including first dummy wires, and second dummy parts each including a plurality of second dummy wires. In plan view perpendicular to the transparent dielectric substrate, first capacitive electrode parts face respective second dummy parts, and second capacitive electrode parts face respective first dummy parts. A combination of first electrode wires and second dummy wires forms a first section of a lattice pattern, and the first electrode wires form line segments different from those formed by second dummy wires. A combination of second electrode wires and first dummy wires forms a second section of the lattice pattern, and the second electrode wires form line segments different from those formed by the first dummy wires.