Abstract
Tactile sensation is a promising information display channel for human beings that involves supplementing or replacing degraded visual or auditory channels. In this paper, a wrist-wearable tactile rendering system based on electro-tactile stimulation is designed for information expression, where a square array with 8 × 8 spherical electrodes is used as the touch panel. To verify and improve this touch-based information display method, the optimal mode for stimulus signals was firstly investigated through comparison experiments, which show that sequential stimuli with consecutive-electrode-in-active mode have a better performance than those with single-electrode-in-active mode. Then, simple Chinese and English characters and 26 English characters’ recognition experiments were carried out and the proposed method was verified with an average recognition rate of 95% and 82%, respectively. This wrist-wearable tactile display system would be a new and promising medium for communication and could be of great value for visually impaired people.
Highlights
Tactile rendering provides users with a bidirectional communication channel of rich information, which is superior to the traditional two main single-channel human–computer interfaces: visual and auditory rendering [1]
The results show that the proposed method suppresses spatial variation and reduces temporal change
This paper presents a wrist-wearable tactile rendering system based on electro-tactile principles
Summary
Tactile rendering provides users with a bidirectional communication channel of rich information, which is superior to the traditional two main single-channel human–computer interfaces: visual and auditory rendering [1]. Tactile rendering can enhance the realism and immersion of a virtual reality system with a specific human–computer interface device. Peruzzini et al [2] combined electro-tactile and mechanical vibration and used a tactile pad which is composed of 256 pin electrodes to distinguish different virtual materials as well as to identify the material class. Kajimoto et al [3] proposed a real-time pulse width modulation method. By measuring the relationship between skin resistance and absolute threshold, a function is found to determine the suitable pulse width from skin resistance. The method can stabilize the perception of electro-tactile based on the variability of traditional perception. The results show that the proposed method suppresses spatial variation and reduces temporal change
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