Haptic Feedback Layer with Piezoelectric Actuators
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Solution Overview
Problem
Existing touch-based user interfaces lack haptic feedback, making it difficult for users to navigate and interact with virtual buttons or icons on screens, as they can only feel the rigid surface and not receive tactile confirmation of selections.
Innovation Solution
Incorporating a haptic feedback layer with piezoelectric actuators embedded in a nonconductive material, which can provide mechanical stimulation, such as vibrations or motions, to enhance user interaction, and optionally covered by a protective coating, with a printed circuit board layer to supply voltage to the actuators and sensors to recognize various touch gestures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rigid touch screen surface is used, then the device structure is simple and durable, but the user cannot receive tactile feedback when interacting with virtual buttons or icons
Solution Approach 1:
The touch screen is divided into multiple independent haptic actuator elements distributed across the surface. Each actuator can be individually controlled to provide localized tactile feedback at specific interaction points, allowing tactile feedback without requiring a completely redesigned structure.
Solution Approach 2:
Haptic feedback is provided only at specific locations where virtual buttons or icons are displayed, rather than across the entire screen. This localized approach provides necessary tactile feedback while minimizing structural complexity and energy consumption.
2Ease of operation
If haptic feedback actuators are added to the touch screen, then tactile feedback is provided to users, but the device complexity increases
Solution Approach 1:
The haptic feedback layer is integrated with the existing touch screen structure by positioning actuators between the touch sensitive surface and the display component. This merging approach allows tactile feedback functionality to be added without creating a completely separate system, thereby managing complexity.
Solution Approach 2:
The touch screen structure is designed to serve multiple functions: visual display, touch sensing, and haptic feedback. By making the structure multi-functional, the need for separate dedicated components is reduced, managing overall device complexity while providing comprehensive interaction capabilities.
3Ease of operation
If piezoelectric actuators are embedded in the touch screen, then localized haptic feedback is provided, but the manufacturing process becomes more complex
Solution Approach 1:
Piezoelectric actuators are positioned and secured to the touch screen structure before the touch sensitive surface is assembled. This preliminary placement allows for easier integration and alignment, reducing manufacturing complexity compared to attempting to install actuators after assembly.
Solution Approach 2:
A non-conductive adhesive or mounting layer is used as an intermediary between the piezoelectric actuators and the touch screen structure. This intermediary facilitates easier positioning and securement of the actuators while maintaining electrical isolation, thereby simplifying the integration process.
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 users to feel tactile feedback when interacting with virtual buttons or icons, improving navigation and selection confirmation by providing dynamic localized haptic feedback, enhancing the overall user experience.
Implementation Method 1
a haptic feedback layer including one or more piezoelectric actuators configured to provide a haptic feedback
Data Source
AI summary
One embodiment of a touch-based user interface may include a haptic feedback layer with one or more actuators configured to supply a haptic feedback. The one or more actuators may be embedded in a nonconductive material. The touch-based user interface may further include a printed circuit board layer underlying the haptic feedback layer. The printed circuit board layer may include one or more conductive traces configured to supply a voltage to the one or more actuators.