Capacitive Touch Sensor Apertures for Electrotactile Haptic Feedback
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Solution Overview
Problem
Integrating capacitive touchscreen technology with electrotactile haptic feedback poses a technical challenge due to capacitive cross-coupling issues, which hinder accurate touch input detection and cause unintentional triggering of sensors.
Innovation Solution
Incorporating an electrotactile layer with strategically designed apertures that reduce capacitive cross-coupling between the capacitive touch sensors and the electrotactile layer, allowing for effective haptic feedback while maintaining accurate touch input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electrotactile layer is integrated with capacitive touch sensors, then haptic feedback capability is improved, but capacitive cross-coupling causes unintentional sensor triggering and reduces touch input detection accuracy
Solution Approach 1:
The electrotactile layer is segmented into multiple independently controllable electrode regions that correspond to different tactile feedback zones. This segmentation allows selective activation of haptic feedback in specific areas without affecting adjacent touch sensor regions, thereby reducing capacitive cross-coupling interference and preventing unintentional sensor triggering while maintaining haptic feedback functionality.
Solution Approach 2:
Different regions of the electrotactile layer are designed with locally optimized electrode configurations and capacitance characteristics. By tailoring the electrical properties of each local region to match its specific function (touch detection vs. haptic feedback), the system minimizes capacitive coupling between adjacent functional zones and improves overall system performance.
2Force
If the electrotactile layer is positioned adjacent to the capacitive touch sensor, then haptic feedback effectiveness is improved, but capacitive cross-coupling increases causing sensor interference
Solution Approach 1:
A dielectric intermediary layer is introduced between the electrotactile layer and the capacitive touch sensor. This intermediary layer acts as a capacitive barrier that reduces direct coupling between the two functional layers, thereby minimizing sensor interference while preserving the effectiveness of haptic feedback transmission to the user's finger.
Solution Approach 2:
The electrotactile layer is constructed using flexible thin-film electrode structures that can be precisely positioned and shaped. These thin-film structures reduce the overall capacitance of the electrotactile layer, thereby decreasing capacitive cross-coupling with adjacent touch sensors while maintaining sufficient haptic feedback force through optimized electrode geometry and material selection.
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
The solution enables seamless integration of capacitive touchscreen and electrotactile technology by minimizing capacitive cross-coupling, ensuring reliable touch input detection and preventing unintentional sensor activation, thus enhancing the user experience in portable electronic devices.
Implementation Method 1
a first sensor configured to couple capacitively to a stylus when said stylus is in proximity to the first sensor, capacitive coupling between the first sensor and the stylus configured to generate a first touch input signal
Implementation Method 2
a layer configured to couple capacitively to the stylus when said stylus is in proximity to the layer, capacitive coupling between the layer and the stylus configured to provide haptic feedback
Data Source
AI summary
An apparatus including a first sensor configured to couple capacitively to a stylus when said stylus is in proximity to the first sensor, capacitive coupling between the first sensor and the stylus configured to generate a first touch input signal to enable detection of a first touch input; and a layer configured to couple capacitively to the stylus when said stylus is in proximity to the layer, capacitive coupling between the layer and the stylus configured to provide haptic feedback, wherein the layer is positioned adjacent the first sensor, the positioning resulting in capacitive cross-coupling between the first sensor and the layer, and wherein the layer includes a first aperture configured to reduce the capacitive cross-coupling.