Haptic Effect Scene Format for Imperceptible Washout Rendering
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Solution Overview
Problem
Haptic rendering devices face physical limitations in combining haptic effects, such as delivering heat sensations and movements, due to inertia and washout periods that can be perceived by users, especially in immersive environments.
Innovation Solution
A haptic scene format differentiates washout effects from normal haptic effects, allowing adaptation of haptic signals to remain below perception thresholds, considering device capabilities and target body parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If haptic effects are combined to deliver multiple sensations (heat, movement, vibration), then the realism and immersion of the user experience is improved, but the physical limitations of the device (inertia, washout periods) cause noticeable delays and reduce the seamless quality of the haptic feedback
Solution Approach 1:
The system performs preliminary actions by delivering haptic effects in a predetermined sequence before the user can perceive the transitions. The controller is configured to deliver haptic effects corresponding to different sensory modalities (tactile, kinesthetic, proprioceptive) in a specific sequence that exploits the temporal integration properties of the human sensory system, making the washout periods imperceptible.
Solution Approach 2:
The system maintains continuous useful action by overlapping haptic effect deliveries across different sensory modalities. While one haptic actuator is recovering (washout period), another actuator delivering a different type of haptic effect is active, ensuring that the user continuously perceives haptic feedback without noticeable gaps or transitions.
2Force
If haptic actuators are stimulated to deliver strong haptic effects, then the intensity and impact of the feedback is improved, but the inertia of the actuators prevents immediate delivery of subsequent effects in opposite directions
Solution Approach 1:
The system transitions from a single-dimension haptic feedback approach to a multi-dimensional approach by stimulating different sensory modalities (tactile, kinesthetic, proprioceptive) simultaneously or in sequence. When one actuator is constrained by inertia, the system activates actuators targeting different sensory dimensions, effectively adding temporal and sensory dimensions to the haptic feedback space.
Solution Approach 2:
The system changes parameters by switching between different types of haptic actuators with different physical characteristics and response times. Each actuator type has different inertia, bandwidth, and force capabilities, allowing the system to optimize the delivery of haptic effects by selecting appropriate actuators for each effect based on the required force intensity and direction.
3Adaptability or versatility
If multiple haptic actuators are used to cover different sensory modalities, then the comprehensiveness of the haptic feedback is improved, but the complexity of coordinating and synchronizing the actuators increases
Solution Approach 1:
The system uses feedback mechanisms to coordinate multiple haptic actuators. The controller monitors the state of each actuator and adjusts the delivery of haptic effects based on the current system state, ensuring proper synchronization and timing. This feedback loop allows the system to manage the complexity of coordinating multiple actuators while maintaining comprehensive sensory modality coverage.
Data Source
AI summary
Syntax elements of a haptic scene format distinguish, for a haptic signal, the parts of the haptic signal related to the haptic effect from the parts related to the washout. This allows a haptic rendering device to adapt the haptic signal to the specific type of haptic device, the haptic device capabilities and the target body part, in order to remain below the perception threshold and ensure the expected haptic experience.