Perceptually Inspired C⁰-Continuity Haptic Shape Display with Trichamber Soft Actuators

Area of Science:

• Haptics and Human-Computer Interaction
• Computational Geometry
• Soft Robotics

Background:

• Shape display devices are crucial for immersive virtual reality (VR) and metaverse applications.
• Traditional pin-array displays struggle to render continuous curved surfaces efficiently.
• Achieving smooth surface morphology with low-resolution actuation remains a significant challenge.

Purpose of the Study:

• To develop a C0-continuity shape display device capable of rendering continuous curved surfaces using a minimal number of actuated units.
• To leverage computational geometry principles for enhanced shape rendering fidelity.
• To improve the tactile realism in metaverse applications like medical simulations.

Main Methods:

• Development of a C0-continuity shape display utilizing trichamber fiber-reinforced soft actuators.
• Each actuator unit provides 3D deformation (elongation, pitch, yaw) for surface continuity.
• Establishment of mathematical criteria for C0-continuity and a control model accounting for soft material nonlinearity.

Main Results:

• The proposed device ensures rendered surface continuity with low-resolution actuation units.
• Experimental validation with nine trichamber units demonstrated the rendering of distinguishable C0-continuity shape sequences.
• Comparison with pin-array systems indicated potential for improved shape discrimination.

Conclusions:

• The C0-continuity shape display concept with 3D soft actuator deformation significantly enhances shape rendering fidelity.
• This technology holds promise for more realistic interactions in metaverse scenarios, such as tactile simulations in medical training.
• The approach offers a more efficient method for creating continuous curved surfaces compared to traditional pin-array systems.