HapThimble

This research introduces HapThimble, a wearable haptic device designed to improve the usability of virtual touch screens by providing rich haptic feedback without physical movement restrictions. While conventional virtual touch screens suffer from poor user performance due to the absence of haptic information and physical constraints, HapThimble mimics the sensation of physical buttons by rendering tactile, pseudo-force, and vibrotactile feedback based on force-penetration depth curves. Through a series of three experiments, the study demonstrates that providing haptic information alone—without haptically restricting the user's finger—significantly enhances performance in clicking and dragging tasks compared to bare-hand or physically constrained conditions. Furthermore, results indicate that users can successfully differentiate between various virtual button profiles, such as hard keys and soft keys, with a 90.3% success rate in matching them to physical counterparts. This project highlights that haptic feedback without haptic constraint is a viable and effective solution for everyday mobile interactions in augmented reality environments.