Vibrotactile displays offer significant potential for conveying information through the sense of touch in a wide variety of applications. Spatial resolution of these displays is limited by the large size of actuators. We present a new selective electromagnetic actuation technique to control the vibrations of multiple tactile elements using a single coil based on their individual mechanical resonance frequencies. This technique allows low-cost and highly reliable implementation of many tactile elements on a smaller area. A prototype is manufactured using 3D-printed tactile elements and off-the-shelf coils to characterize the proposed technique. This prototype successfully increases the resolution by 100 % from 16 to 32 tactile pixels (taxels) on a 25 cm² pad, without sacrificing other performance metrics such as refresh rates and power consumption. The multiphysics finite element analysis developed for this new actuation technique are experimentally validated by optical vibrometry measurements. This work demonstrates the capability of resonance-selective electromagnetic actuator in developing high-resolution low-cost vibrotactile displays.

触觉显示器在各种应用中具有通过触摸感传达信息的巨大潜力。这些显示器的空间分辨率受到执行器尺寸的限制。我们提出了一种新的选择性电磁驱动技术，以基于单个线圈的各个机械共振频率来控制多个触觉元件的振动。该技术允许在较小的面积上低成本且高度可靠地实现许多触觉元件。使用3D打印的触觉元件和现成的线圈制造原型来表征所提出的技术。该原型在25 cm ²上成功地将分辨率从16个触觉像素（紫杉醇）提高了100％，达到32％焊盘，而不会牺牲其他性能指标，例如刷新率和功耗。为这种新的驱动技术开发的多物理场有限元分析已通过光学振动测量法进行了实验验证。这项工作展示了共振选择性电磁执行器在开发高分辨率低成本振动式触觉显示器中的能力。