Work

Contactless Braille sensing based on GaN optical devices integrated with epoxy lenses

Year: 2025

Type: article

Abstract: Braille serves as an efficient means for visually impaired individuals to access textual information and engage in communication. However, the process of reading Braille can often be cumbersome and time-intensive, particularly in bidirectional human-machine interaction. In this work, a compact optical device for contactless detection of Braille is fabricated and characterized. The GaN-on-sapphire chip, which employs monolithic integration, serves as the core for both light emission and photodetection, significantly reducing its overall footprint. The incorporation of the semi-ellipsoid epoxy lens with optimized dimensions ensures consistent and accurate detection. The sensing device demonstrates high stability and fast response through its line-scanning capabilities on Braille codes. The captured signals are analyzed using a microcontroller, and the Braille recognition results are wirelessly transmitted to a portable mobile device, enabling the conversion into audio and visual formats. This innovative design not only facilitates Braille reading but also holds the potential to advance human-machine interaction.

Source: Microsystems & Nanoengineering

DOI: 10.1038/s41378-025-00904-8

Authors: Hongyu Cheng, Jiahao Yin, Sirui Li, Kwai Hei Li

Institution: Southern University of Science and Technology

Language: English

Topic: GaN-based semiconductor devices and materials

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,790

Funder: National Natural Science Foundation of China