Adaptive Friction Grain Signal for Realistic Haptic Feedback
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Solution Overview
Problem
Existing methods for generating haptic feedback on tactile surfaces fail to realistically mimic the kinesthetic and cutaneous sensations experienced when interacting with physical widgets, providing generic and incomplete haptic perceptions.
Innovation Solution
A method and device that utilize an adaptive friction grain signal with variable grain density and amplitude to produce vibration bursts, modeled based on force-displacement and vibration-displacement data from physical widgets, allowing for realistic simulation of widget displacement phases, including a jump phase and bottom-out phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vibrotactile actuators are triggered in response to force detection, then haptic feedback is generated, but the feedback fails to realistically mimic physical widget interactions and remains generic
Solution Approach 1:
The patent applies dynamics by making the haptic feedback signal adaptive and variable rather than static. The grain density and amplitude of vibration bursts dynamically change based on the interaction phase (jump phase, bottom-out phase), allowing the system to realistically mimic physical widget behavior while managing complexity through phase-based control
Solution Approach 2:
The patent changes parameters by varying grain density and amplitude according to different interaction phases. During the jump phase, grain density increases and amplitude changes, while during the bottom-out phase, different parameter values are applied. This parameter variation enables realistic haptic feedback without requiring complex hardware modifications
2Ease of operation
If the tactile surface remains rigid and motionless, then device structure is simple, but kinetic and cutaneous sensory stimuli are absent
Solution Approach 1:
The patent applies mechanical vibration by using actuators to generate controlled vibration bursts on the tactile surface. These vibrations recreate the kinetic and cutaneous sensory stimuli normally felt when interacting with physical widgets, transforming a rigid surface into one that provides rich tactile feedback through precisely timed vibration sequences
Solution Approach 2:
The patent uses copying by recreating the vibration patterns and sensory characteristics of physical widgets through synthesized grain signals. Instead of physically replicating the entire widget structure, the system copies the essential tactile characteristics (grain density, amplitude, timing) to provide realistic feedback through a flat tactile surface
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 solution generates a more complete and complex haptic feedback that realistically replicates the sensations of interacting with physical widgets, enhancing user experience by providing a more authentic tactile feedback.
Implementation Method 1
vibrating the tactile surface by producing vibration bursts based on a sequence of an adaptive friction grain signal
Data Source
AI summary
A method, a feedback-enabled device and a computer-readable memory are provided, for generating haptic feedback. The actuators of a tactile surface are vibrated for producing vibration bursts based on a sequence of an adaptive friction grain signal. The adaptive friction grain signal comprises a plurality of grains corresponding to the vibration bursts, each grain being defined by an amplitude. The adaptive friction grain signal has a grain density that is variable over the sequence.