Tactile feedback added to touchscreens provides users with a high-quality interactive experience. The effect of tactile feedback on typical interaction gestures requires to be evaluated. With a custom-designed electrostatic tactile feedback device, we explore the effects of tactile feedback on zoom-in/out gestures and determine the issues satisfied by the relationship between completion time (CT) and index of difficulty (ID). Specifically, we compare the effect of electrostatic tactile feedback on the efficiency and accuracy of zoom-in/out gestures in three conditions, that is, no tactile feedback, linearly increasing tactile feedback force over operation process, and tactile feedback only in a target area. Then, we study the relationship between CT and ID with tactile feedback added to the target area. Results of experimental data from 12 participants show that tactile feedback added only to a target area can significantly increase operational efficiency and accuracy of zoom-in/out gestures. Furthermore, the relationship between CT and ID agrees well with Fitts’ law, and the correlation coefficient is larger than 0.9.

中文翻译：

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使用触摸屏上的静电触觉反馈增强了放大/缩小手势的交互性能

添加到触摸屏的触觉反馈为用户提供了高质量的交互体验。需要评估触觉反馈对典型交互手势的影响。使用定制设计的静电触觉反馈设备，我们探索了触觉反馈对放大/缩小手势的影响，并确定了完成时间（CT）和难度指数（ID）之间的关系所满足的问题。具体而言，我们比较了三种情况下静电触觉反馈对放大/缩小手势的效率和准确性的影响，即没有触觉反馈，在整个操作过程中线性增加触觉反馈力以及仅在目标区域内的触觉反馈。然后，我们通过将触觉反馈添加到目标区域来研究CT和ID之间的关系。来自12位参与者的实验数据结果表明，仅将触觉反馈添加到目标区域可以显着提高操作效率和放大/缩小手势的准确性。此外，CT和ID之间的关系与Fitts定律非常吻合，相关系数大于0.9。