Tactile Feedback Apparatus with Fitted Waveforms
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tactile feedback systems for virtual buttons rely solely on motor-driven vibrations, providing a single and incomplete tactile experience, making it impossible to distinguish between touch and press sensations without visual assistance.
Innovation Solution
A tactile feedback method that determines the touch state and selects a fitting waveform, including boundary and press tactile sense waveforms, by fitting a touch simulation mechanical curve to provide a more realistic tactile experience through vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor-driven vibration is used for tactile feedback, then the tactile feedback apparatus can vibrate to provide feedback, but the tactile sensation is single and cannot distinguish between touch and press states
Solution Approach 1:
The patent applies dynamics by using multiple vibration waveforms (boundary waveform, press waveform, release waveform) that dynamically change based on touch state. The control unit selects different waveforms according to whether the touch is at the boundary or center of a virtual button, providing differentiated tactile sensations for different interaction states.
Solution Approach 2:
The patent changes vibration parameters including frequency (200-800 Hz for boundary waveform, 2000-6000 Hz for press waveform), duration (10-30 ms for boundary, 60-200 ms for press), and voltage amplitude to create distinct tactile sensations. These parameter variations enable the system to differentiate between touch and press states through tactile feedback alone.
2Device complexity
If single waveform vibration is used, then the control system is simple, but visual assistance is needed to judge touch state
Solution Approach 1:
The patent segments the vibration feedback into distinct waveform types (boundary waveform with 200-800 Hz frequency, press waveform with 2000-6000 Hz frequency, release waveform) that correspond to different touch states. Each waveform type provides specific tactile information about the touch state, enabling users to distinguish between boundary touch, press, and release without visual assistance.
Solution Approach 2:
The control unit implements feedback by selecting and outputting different waveforms based on touch position detection. When touch is detected at the boundary area, the boundary waveform is output; when touch is at the center area, the press waveform is output. This closed-loop feedback provides accurate tactile state information back to the user.
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 method enhances user experience by providing a more realistic tactile feedback that simulates the boundary and press sensations of real buttons, improving the ability to discern touch and press states without visual assistance.
Implementation Method 1
at least one piezoelectric device located on one side of the touch substrate
Data Source
AI summary
A tactile feedback method includes: determining a touch state; selecting a fitting waveform corresponding to the touch state according to the touch state; and providing an electrical signal to the tactile feedback apparatus according to the fitting waveform, so as to enable the tactile feedback apparatus to vibrate. A method for obtaining the fitting waveform includes: obtaining a touch simulation mechanical curve, and fitting the touch simulation mechanical curve to obtain the fitting waveform of the electrical signal to be provided to the tactile feedback apparatus.