TableHop

Abstract

We present TableHop, a tabletop display that provides controlled self-actuated deformation and vibro-tactile feedback to an elastic fabric surface while retaining the ability for highresolution visual projection. The surface is made of a highly stretchable pure spandex fabric that is electrostatically actuated using electrodes mounted on its top or underside. It uses transparent indium tin oxide electrodes and high-voltage modulation to create controlled surface deformations. Our setup actuates pixels and creates deformations in the fabric up to ±5 mm. Since the electrodes are transparent, the fabric surface functions as a diffuser for rear-projected visual images, and avoid occlusion by users or actuators. Users can touch and interact with the fabric to experience expressive interactions as with any fabric based shape-changing interface. By using frequency modulation in the high-voltage circuit, it can also create localized tactile sensations on the user's fingertip when touching the surface. We provide simulation and experimental results for the shape of the deformation and frequency of the vibration of the surface. These results can be used to build prototypes of different sizes and form-factors. We present a working prototype of TableHop that has 30×40 cm 2 surface area and uses a grid of 3×3 transparent electrodes. It uses a maximum of 9.46 mW and can create tactile vibrations of up to 20 Hz. TableHop can be scaled to make large interactive surfaces and integrated with other objects and devices. TableHop will improve user interaction experience on 2.5D deformable displays.

3D Printed Deformable Surfaces for Shape-Changing Displays

“…Coelho and Zigelbaum (2011) survey shape-changing materials and their primary dynamic properties; while recent reviews classify (Rasmussen et al, 2012;Sturdee and Alexander, 2018) current state-of-the-art for shape-changing displays and interfaces. Commonly, shape-changing displays consist of a 2D array of motorized linear actuation pins (Poupyrev et al, 2004;Leithinger and Ishii, 2010;Follmer et al, 2013;Leithinger et al, 2013;Ishii et al, 2015;Jang et al, 2016) or deformable surface materials (Dand and Hemsley, 2013;Tsimeris et al, 2013;Yao et al, 2013;Sahoo et al, 2016). Our work builds on this previous research, specifically on shape-displays with motorized linear actuators for this initial exploration.…”

“…TableHop (Sahoo et al, 2016) is an elastic self-actuated display surface, with a 3 × 3 grid of transparent electrodes. Rearprojection retains high-resolution visuals without occlusion.…”

Multilayer Haptic Feedback for Pen-Based Tablet Interaction

“…Other kinds of materials, including sand and fluids, have also been studied, but are also difficult to control [20]. In contrast, jamming interfaces [20] and Tablehop [67] provide flexible and shape-changing user interfaces with controllable material stiffness (firmness), which are also suitable for mobile devices [20]. This approach illustrates some of the potential of haptic feedback through controllable stiffness.…”

Interactions of children and young adults using large-scale elastic displays

“…As an emerging technology, most of the current studies on elastic displays have focused on evaluating the performance of such displays [6,28]. However, evaluations of large-scale elastic displays are scarce.…”