Piezoelectric Touch Panel for Pressure-Sensitive Input
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Solution Overview
Problem
Conventional touch panels, such as projected capacitance touch panels, cannot differentiate between light taps and heavy presses, limiting user interaction and failing to provide pressure-sensitive input, while mechanical buttons are prone to accidental activation and environmental vulnerabilities.
Innovation Solution
A device incorporating a touch panel with a layer of piezoelectric material between electrodes, combined with piezoelectric input regions on various surfaces, allowing for capacitive and force sensing using the same electrode set, which enables pressure-sensitive input without moving parts, thus preventing accidental activation and maintaining environmental sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If projected capacitance touch panels are used, then multi-touch events can be differentiated, but pressure sensing capability is lost
Solution Approach 1:
The patent combines projected capacitance touch sensing with piezoelectric force sensing into a single integrated system. The piezoelectric material layer is positioned between the capacitive touch panel and the device body, allowing simultaneous detection of both capacitive touch events and pressure forces through separate but coordinated sensing mechanisms.
Solution Approach 2:
The piezoelectric material layer serves multiple functions: it acts as a force-sensitive element for pressure sensing, while also being compatible with the capacitive touch panel structure to enable multi-touch detection. This multi-functional design allows the device to perform both capacitive and piezoelectric sensing operations through a single integrated layer.
2Ease of operation
If mechanical buttons are added for additional input, then force-sensitive control is achieved, but accidental activation and environmental vulnerabilities increase
Solution Approach 1:
The patent replaces traditional mechanical buttons with a piezoelectric sensing layer that detects force applied to the device body or cover. This eliminates moving parts and mechanical switches, substituting them with an electronic sensing mechanism that maintains force-sensitive control while improving reliability by preventing accidental activation and environmental damage.
Solution Approach 2:
The piezoelectric material is implemented as a thin film or layer that can be integrated into the device structure, allowing force sensing across various surfaces including the cover and body. This flexible implementation enables force-sensitive buttons without requiring rigid mechanical button structures.
3Ease of operation
If mechanical buttons are used for additional input, then force-sensitive control is achieved, but device complexity and environmental sealing are compromised
Solution Approach 1:
The piezoelectric material layer is integrated with the existing device structure, combining force sensing functionality with the device's cover or body. This merging approach adds force-sensitive control capability without requiring separate mechanical button assemblies, thereby reducing overall device complexity.
4Ease of operation
If mechanical buttons are used, then force input is detectable, but environmental sealing is compromised
Solution Approach 1:
The patent replaces mechanical buttons that require physical openings in the device seal with a piezoelectric sensing layer that can detect force through the sealed cover or body structure. This substitution maintains environmental sealing integrity while preserving force input detection capability.
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
Enables advanced user interaction by differentiating between varying pressures and preventing accidental actuation, while maintaining the device's structural integrity and environmental sealing.
Implementation Method 1
The touch panel includes a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode
Data Source
AI summary
A device (1) includes a body (2) and a touch panel (3) supported by, integrated with, or underlying the body (2). The touch panel (3) includes a layer of piezoelectric material (5) disposed between a plurality of first electrodes (6) and at least one second electrode (7). The device (1) also includes at least one second piezoelectric input region (8) supported by, integrated with, or underlying a portion of the body (2) which does not correspond to the touch panel (3). The device (1) is configured to receive user input using the touch panel (3) and/or at least one piezoelectric input region (8).