Haptic Feedback Device Modulating Vibration Frequency by Touch Speed
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Solution Overview
Problem
Existing haptic feedback devices for touch panels often fail to provide appropriate sensory feedback, leading to uncertainty for users regarding touch detection, as they rely solely on vibration frequency without considering touch speed and image features.
Innovation Solution
A haptic feedback device that calculates touch speed and generates a modulation signal with increasing frequency based on touch speed and image features, modulating a carrier signal to provide vibrations that match the speed and image characteristics, ensuring appropriate and natural feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vibration frequency is varied based on touch position only, then haptic feedback efficiency is improved, but appropriateness of haptic feedback deteriorates
Solution Approach 1:
The patent applies dynamics by making the vibration parameters adaptive and changeable in real-time. The system dynamically adjusts both the frequency and amplitude of vibrations based on multiple variables including touch position, touch speed, and image features, rather than using fixed vibration patterns. This allows the haptic feedback to evolve and respond appropriately to different user interactions and display contexts.
Solution Approach 2:
The patent implements parameter changes by modifying multiple vibration parameters simultaneously - frequency, amplitude, and duration - based on calculated touch speed and extracted image features. The system changes these parameters dynamically to match the visual content being displayed, such as adjusting vibration intensity to correspond with object size or movement speed in the image, thereby resolving the contradiction between efficiency and appropriateness.
2Reliability
If touch speed and image features are considered, then appropriateness of haptic feedback is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a multi-functional processing system that handles multiple tasks within integrated components. The same processing unit calculates touch speed, extracts image features, determines vibration parameters, and controls the actuator, rather than requiring separate dedicated hardware for each function. This approach reduces overall system complexity while maintaining the capability to provide context-appropriate haptic feedback.
Solution Approach 2:
The patent uses an intermediary approach by introducing a processing unit that acts as a mediator between the touch input detection and the haptic output generation. This intermediary component analyzes both touch characteristics and display content, then synthesizes appropriate vibration parameters, thereby managing system complexity through centralized intelligent control rather than distributed complex hardware.
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 provides clear and appropriate haptic feedback to users, enhancing the sense of touch by adjusting vibration amplitude and frequency in accordance with touch speed and image features, thereby confirming touch detection and synchronizing with visual perception.
Implementation Method 1
an actuator which provides haptic feedback to the user by vibrating the panel in accordance with the modulated carrier signal
Data Source
Figure 1
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Figure 4A~4B
AI summary
A haptic feedback device (400) which provides haptic feedback to a user touching a panel, the haptic feedback device including: the panel (101); a position obtaining unit (102) which obtains a first touch position touched on the panel by the user and a second touch position touched on the panel by the user after the first touch position; a speed calculation unit (105) which calculates a speed of a touch starting at the first touch position and ending at the second touch position; a modulation signal generation unit (407) which generates a modulation signal having a frequency component at a frequency that increases with the speed; a carrier signal generation unit (108) which generates a carrier signal for vibrating the panel; a modulation unit (109) which modulates the carrier signal using the modulation signal; and an actuator (110) which provides haptic feedback to the user by vibrating the panel in accordance with the modulated carrier signal.