Touch Sensor Electrode Pattern for Finer Detection
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Solution Overview
Problem
Current touch sensors face challenges in detecting finer patterns and maintaining improved linearity due to limitations in electrode configurations and material usage, which affect their optical, free-space, and moisture performance.
Innovation Solution
The implementation of a touch sensor with alternating drive and sense electrodes in specific patterns on multiple layers, using conductive materials like ITO and FLM, reduces the number of crossovers and enhances interpolation capabilities, allowing for improved detection of finer patterns and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrode configurations are used, then material usage is sufficient, but the ability to detect finer patterns and maintain linearity is limited
Solution Approach 1:
The electrode configuration is segmented into alternating drive and sense electrodes arranged in specific patterns across multiple layers. This segmentation allows for reduced material usage while maintaining enhanced detection capability for finer patterns through the distributed electrode arrangement.
Solution Approach 2:
The patent extends the electrode arrangement to multiple layers, transitioning from a single-plane configuration to a three-dimensional spatial arrangement. This dimensional change enables reduced material usage per layer while collectively providing enhanced pattern detection capability across the stacked structure.
2Measurement precision
If alternating drive and sense electrodes in specific patterns are implemented, then interpolation capabilities are enhanced, but device complexity increases
Solution Approach 1:
The electrode system is divided into distinct drive and sense electrode segments arranged in alternating patterns. This segmentation enables enhanced interpolation capabilities by creating multiple measurement points, while the modular segmented structure actually simplifies the overall design compared to continuous electrode arrangements.
Solution Approach 2:
By distributing electrodes across multiple layers, the patent enhances interpolation capabilities through vertical stacking rather than increasing horizontal complexity. This dimensional approach improves measurement precision while maintaining manageable device complexity through systematic layering.
3Illumination intensity
If the number of crossovers is reduced, then optical performance improves, but capacitance between electrodes may increase
Solution Approach 1:
The patent separates drive and sense electrodes into different layers, utilizing the vertical dimension to reduce horizontal crossovers and improve optical performance. The layered configuration maintains electrical isolation between electrodes through dielectric layers, preventing excessive capacitance despite reduced physical separation in the horizontal plane.
Solution Approach 2:
Dielectric layers are introduced as intermediary elements between drive and sense electrodes in the stacked configuration. These intermediary layers optically transmit light to improve optical performance while electrically isolating the electrodes to control capacitance, simultaneously addressing both requirements.
4Reliability
If electrodes are arranged on multiple layers, then free-space performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes vertical stacking of electrode layers to improve free-space performance by creating three-dimensional electrode patterns. This layered approach enables standard semiconductor manufacturing techniques to be applied sequentially, actually simplifying manufacturing compared to attempting to create complex three-dimensional patterns in a single layer.
Solution Approach 2:
The multi-layer electrode structure is manufactured through segmented processing steps, with each layer being fabricated and assembled separately. This segmentation of the manufacturing process into discrete layer fabrication steps aligns with standard industrial manufacturing capabilities, improving ease of manufacture while achieving enhanced free-space performance.
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 enhances the touch sensor's ability to detect finer patterns with improved linearity, while minimizing retransmission effects and capacitance between electrodes, resulting in improved optical, free-space, and moisture performance, and reducing material requirements.
Implementation Method 1
using conductive materials like ITO and FLM
Implementation Method 2
When an object touches or comes within proximity of the surface of the capacitive touch screen, a change in capacitance may occur within the touch screen at the location of the touch or proximity
Data Source
AI summary
In certain embodiments, a touch sensor comprises a substrate and a plurality of electrodes disposed on the substrate. The plurality of electrodes comprise a drive line having a plurality of drive electrodes and a sense line having a plurality of sense electrodes. At least one of the drive line and sense line has at least three rows of electrodes.