Design and Evaluation of an Electromagnetic Bounce-Type Refreshable Braille Display

Area of Science:

• Engineering
• Assistive Technology
• Materials Science

Background:

• Digital content accessibility remains a challenge for the visually impaired (BVI).
• Existing refreshable Braille displays (RBDs) can be costly and complex.
• A need exists for low-cost, efficient tactile displays.

Purpose of the Study:

• To develop a novel, low-cost bounce-type actuator for refreshable Braille displays (RBDs).
• To enable convenient digital reading and tactile graphic display for the BVI.
• To enhance RBD performance with high refresh rates and strong latching capabilities.

Main Methods:

• Design and fabrication of a bounce-type actuator using an electromagnet and permanent magnets.
• Electromagnetic force analysis and finite element simulation of actuator performance.
• Experimental measurement of actuator and prototype refresh rates.

Main Results:

• The bounce-type actuator achieves a refresh rate of approximately 16 Hz.
• The complete refreshable Braille display (RBD) prototype demonstrates an overall refresh rate of up to 2.7 Hz.
• The design ensures a large latching force, low energy consumption, and scalability.

Conclusions:

• The proposed electromagnetic bounce-type actuator provides a viable solution for cost-effective RBDs.
• The developed RBD offers improved accessibility for the BVI to digital information and tactile graphics.
• The technology is scalable, reliable, and durable, promoting digital inclusion.