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Design and Experiment Using Flexible Bumps for Piezoelectric-Driven Hydraulically Amplified Braille Dot Display
Xiaochao Tian1,2, Yuze Sun1,2, Zhiyao Li1,2
1Institute of Mechanical and Vehicle Engineering, Changchun University, Changchun 130022, China.
Micromachines
|August 6, 2021
Summary
This study presents a novel piezoelectric-driven device for generating Braille characters. The flexible bump device effectively creates tactile dots meeting touch sensitivity standards for the visually impaired.
Area of Science:
- Engineering
- Haptics
- Assistive Technology
Background:
- Developing effective tactile displays for Braille is crucial for accessibility.
- Existing Braille technologies may have limitations in flexibility or actuation.
Purpose of the Study:
- To design and validate a piezoelectric-driven, hydraulically amplified Braille-flexible bump device.
- To enable the flexible and sensitive formation of Braille characters.
Main Methods:
- Structural design and working principle explanation.
- Kinetic analysis for output displacement and amplification ratio.
- Experimental testing of the device's performance.
Main Results:
- Achieved an output displacement of 0.214 mm, meeting touch sensitivity standards.
- Device operates effectively at a resonance frequency of 375.4 Hz with a 31 mm fluid cavity diameter.
- Demonstrated a water discharge of 8.8 mL.
Conclusions:
- The piezoelectric-driven Braille bump device is a feasible and effective solution.
- The design successfully generates tactile elements suitable for the blind.
- Hydraulic amplification enhances the performance of the Braille display.
