Frequency-Modulated Piezoelectric Haptic Display

2026-09-24

AI Summary

This study addresses the complexity and poor scalability of amplitude-modulation driving systems in high-density tactile displays by proposing a frequency-modulated (FM) haptic display method based on piezoelectric actuators. By encoding tactile intensity through vibration frequency, the approach enables large-area wearable rendering. The core innovation lies in a shared-source FM architecture that allows multiple pixels to share power amplifiers while independently controlling their frequency spectra, thereby significantly reducing hardware complexity. User experiments demonstrate that the system reliably distinguishes both spatial and temporal patterns, validating the feasibility of distributed FM haptic rendering. Ultimately, this work provides a compact and efficient solution for high-density haptic interfaces.

Abstract

We present a frequency-modulated (FM) haptic display based on piezoelectric vibrating actuators. Existing haptic displays commonly encode haptic intensity through the deformation amplitude of individual haptic pixels. Although amplitude-modulated (AM) approaches have enabled compact haptic pixels, independently controlling the deformation amplitude of a large number of pixels can require increasingly complex and bulky driving systems, posing challenges for scaling toward high-density, large-area wearable displays. To address this scaling challenge, we investigate an FM design principle in which haptic intensity is encoded through vibration frequency. We further develop a \textit{Shared-Source Frequency Modulation} (SSFM) structure in which multiple haptic pixels are powered by a common power amplifier while their vibration spectrum are controlled individually, reducing the need for independent high-power amplification at each pixel. A proof-of-concept piezoelectric haptic display was built and evaluated on rendering spatial and temporal haptic patterns through volunteer tests. The results show that participants reliably distinguished spatial and temporal patterns encoded using FM principles within the investigated operating range. These findings demonstrate the feasibility of FM-based distributed haptic rendering and suggest a potential pathway toward more compact driving architectures for future high-density, large-area wearable haptic displays.

Problem

• haptic display
• frequency modulation
• wearable display
• scalability
• piezoelectric actuator

Innovation

• Frequency Modulation
• Piezoelectric Haptic Display
• Shared-Source Frequency Modulation
• Wearable Haptics
• Tactile Rendering