Towards low-cost spatial haptics : brake-based shape displays and automatic content authoring
- Haptic technology can significantly enhance the richness and realism of user interaction by providing the experience of physical touch. It is broadly used in various application scenarios including game controllers, surgical robots, design and modeling tools, and accessibility for Blind people. Tactile displays are a class of haptic devices that can render tactile effects to the users, for example reproducing the skin deformation of a user when in contact with a real object, allowing the user to feel vibration, pressure, touch, and texture. However, key challenges currently limit the widespread use of tactile displays including cost, spatial resolution, fabrication complexity, shape rendering flexibility, and refresh rate. Beyond these hardware limitations, authoring of rich tactile content is another challenge. Although manual authoring methods have been developed, methods that can automatically translate vast amounts of information into meaningful tactile stimuli are highly desirable. In this thesis, I present my work on addressing the hardware and content authoring challenges of the tactile displays. The first part of my thesis work focuses on the use of electrostatic brakes and clutches to enable low-cost tactile displays. I investigated the use of low-cost electrostatic adhesion in the context of high-resolution, refreshable 2.5D tactile shape display. I modeled, fabricated, and characterized the contact force, refresh rate and robustness of the brakes. A user study conducted using an integrated 4×2 tactile shape display based on the brakes showed similar user shape recognition performance using our device and the 3D printed shapes. In addition to the bed-of-nails tactile displays mentioned above, I also explored the formable-crust 2.5D tactile shape displays using auxetic materials. A simulation model and algorithms were developed to investigate the characteristics of the shape display and render a target shape. An experimental prototype was constructed to verify the simulation results. The auxetic 2.5D tactile shape display has the advantages of low cost, large displacement range, and roll-to-roll fabrication compatibility. In the second part of my thesis, I investigated methods to address the content authoring challenges of tactile displays. A pipeline was built to automatically generate spatial tactile effects by analyzing cross-modality features in a video. We believe the above results help to improve the accessibility of the haptic technology to a broader audience
|Type of resource
|electronic resource; remote; computer; online resource
|1 online resource
|Degree committee member
|Degree committee member
|Stanford University, Department of Electrical Engineering
|Statement of responsibility
|Submitted to the Department of Electrical Engineering
|Thesis Ph.D. Stanford University 2020
- © 2020 by Kai Zhang
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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