Touch Panel Tactile Frequency Control for Low-Voltage Vibration
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Solution Overview
Problem
Conventional tactile sensation presentation devices require a large drive voltage to present desired vibrations when multiple touch locations are close together or near the support of the panel.
Innovation Solution
A tactile sensation presentation device with a touch panel, actuators, a touch sensor, and a signal processing device that calculates a fundamental frequency based on touch locations and modulates waveforms to generate driving signals for the actuators, using inverse characteristics to present targeted tactile stimulation with a small drive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple touch locations are close together or near the support of the panel, then the vibration transfer characteristics improve, but the drive voltage required increases significantly
Solution Approach 1:
The patent changes the frequency parameter of the vibration based on the touch location. When multiple touch locations are close together or near the support, the system adjusts the vibration frequency to a range where the panel's natural vibration characteristics provide better transfer efficiency, thereby reducing the drive voltage required while maintaining reliable vibration presentation.
Solution Approach 2:
The patent dynamically adjusts vibration parameters based on real-time touch location detection. By continuously monitoring touch positions and adapting the vibration frequency and amplitude accordingly, the system optimizes the balance between vibration transfer accuracy and energy consumption, preventing excessive drive voltage requirements in challenging spatial configurations.
2Stability of the object's composition
If the touch location is close to the support of the panel, then the structural stability improves, but the vibration transfer efficiency decreases requiring higher drive voltage
Solution Approach 1:
The patent adjusts the vibration frequency parameter based on the distance from the support structure. For touch locations near the support, the system selects frequencies that exploit the panel's vibrational modes more effectively, improving transfer efficiency without requiring proportionally higher drive voltage, thus maintaining panel stability while reducing power consumption.
3Measurement precision
If multiple touch locations have short spacing, then the spatial resolution improves, but the vibration differentiation between locations becomes difficult requiring higher drive voltage
Solution Approach 1:
The patent varies the vibration frequency based on the spacing between touch locations. When touch locations are closely spaced, the system uses frequency modulation to create distinguishable vibration patterns at each location, enabling precise tactile differentiation without requiring excessive drive voltage to overcome the coupling effects between adjacent touch points.
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 device effectively presents tactile stimulation using a small drive voltage, ensuring precise and efficient vibration distribution across the touch panel.
Implementation Method 1
a plurality of actuators disposed at different locations so as to cause the touch panel to vibrate
Implementation Method 2
a touch sensor to detect a touch location at which a user's finger or a joystick is in contact with the touch panel
Data Source
AI summary
A signal processing device includes: a fundamental frequency calculation unit for calculating a fundamental frequency from the touch location; a target waveform calculation unit for modulating a waveform of the fundamental frequency by an envelope waveform of a vibration according to the stimulation type to be presented at the touch location, to calculate a target waveform for the vibration to be presented at the touch location. The fundamental frequency calculation unit calculates the fundamental frequency based on a first distance so that the shorter the first distance is, the higher the fundamental frequency is, the first distance being a minimum distance among distances between touch locations and between a touch location and a support of a panel.