Liu Guohong, Zhang Chen, Sun Xiaoying
IEEE Trans Haptics. 2020 Oct-Dec;13(4):733-744. doi: 10.1109/TOH.2020.2979182. Epub 2020 Dec 25.
Tactile representation on touchscreens plays an important role in improving realism and richness of users' interaction experience. The dynamic lateral force range and the efficient feedback dimensions are very critical in determining the fidelity of tactile displays. This article develops a tri-modal Electrovibration, Ultrasonic Vibration, and Mechanical Vibration (EUMV) tactile display integrating three types of representative principles, which enhances the dynamic lateral force range by leveraging electrostatic and ultrasonic vibrations stimuli, and induces the normal feedback dimension by utilizing mechanical vibration stimulus. Then, a tactile perception scheme with the EUMV display is proposed for simultaneously rendering contour and texture roughness features of visualized surfaces, in which the contour gradient-lateral force model and the texture gradient-perceived roughness model are determined respectively. Objective and subjective evaluations with 20 participants show that the novel scheme establishes significant improvements in both correct recognition ratios of geometric shapes and tactile perception realism of visualized images than the previous studies.
触摸屏上的触觉呈现对于提升用户交互体验的真实感和丰富性起着重要作用。动态侧向力范围和有效的反馈维度在决定触觉显示器的逼真度方面至关重要。本文开发了一种集成了三种代表性原理的三模态电振动、超声振动和机械振动（EUMV）触觉显示器，通过利用静电和超声振动刺激来扩大动态侧向力范围，并利用机械振动刺激来诱导法向反馈维度。然后，提出了一种基于EUMV显示器的触觉感知方案，用于同时呈现可视化表面的轮廓和纹理粗糙度特征，其中分别确定了轮廓梯度 - 侧向力模型和纹理梯度 - 感知粗糙度模型。对20名参与者进行的客观和主观评估表明，与先前的研究相比，该新颖方案在几何形状的正确识别率和可视化图像的触觉感知真实感方面均有显著提升。
