A Novel Refreshable Braille Display Based on the Layered Electromagnetic Driving Mechanism of Braille Dots

Chen, Hao; Tao, Wentao; Liu, Chang; Shen, Qi; Yuecheng, Wu; Ruan, Liuxia; Yang, Wenzhen

doi:10.1109/toh.2023.3241952

Cited by 11 publications

(2 citation statements)

References 25 publications

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“…Apart from the letters and numbers, Braille is another popular surface pattern that has been widely applied for visually impaired groups in daily uses. 47 The standard Braille patterns are composed of precisely arranged dots with built-in text information. Due to the lack of vision, blind people rely on haptic feedback by finger touches to perceive Braille information.…”

Section: Resultsmentioning

confidence: 99%

Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

Fang,

Ding,

Zhou

et al. 2023

ACS Nano

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Exploring flexible tactile sensors capable of recognizing surface information is significant for the development of virtual reality, artificial intelligence, soft robotics, and human−machine interactions (HMI). However, it is still a challenge for current tactile sensors to efficiently recognize the surface pattern information while maintaining the simplicity of the overall system. In this study, cantilever beam-like magnetized micropillars (MMPs) with height gradients are assembled as a position-registered array for rapid recognition of surface pattern information. After crossing the surface location with convex patterns, the deformed MMPs undergo an intrinsic oscillating process to induce damped electrical signals, which can then be converted to a frequency domain for eigenfrequency extraction. Via precisely defining the specific eigenfrequencies of different MMPs, position mapping is realized in crosstalkfree behavior even though all signals are processed by one communication channel and a pair of electrodes. With a customized LabVIEW program, the surface information (e.g., letters, numbers, and Braille) can be accurately reconstructed by the frequency sequence produced in a single scanning procedure. We expect that the proposed interface can be a convenient and powerful platform for intelligent surface information perception and an HMI system in the future.

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Section: Resultsmentioning

confidence: 99%

Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

Fang,

Ding,

Zhou

et al. 2023

ACS Nano

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“…In order to make Braille display devices reliable in performance, fast in response, low in cost, and high in feedback force, a great deal of research has developed Braille dot actuators driven by electromagnetic force. For example, Chen et al [22] implemented a layered electromagnetic driving mechanism to achieve dense arrangement of Braille dots, and provided a latching force greater than 150 mN for raised Braille dots through continuous energy supply. Bettelani et al [23] developed a semi-latching single-cell Braille display device based on the principle of electromagnetic drive for displaying letters and numbers.…”

Section: Introductionmentioning

confidence: 99%

Development and Evaluation of Refreshable Braille Display and Active Touch-Reading System for Digital Reading of the Visually Impaired

Chen,

Zhang,

et al. 2024

IEEE Trans. Neural Syst. Rehabil. Eng.

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The traditional way of reading through Braille books is constraining the reading experience of blind or visually impaired (BVI) in the digital age. In order to improve the reading convenience of BVI, this paper proposes a low-cost and refreshable Braille display device, and solves the problems of high energy consumption and low latching force existing in existing devices. Further, the Braille display device was combined with the 3D Systems Touch device to develop an active Braille touch-reading system for digital reading of BVI with the help of the CHAI3D virtual environment. Firstly, according to the actual needs of BVI to touch and read the Braille dots, this paper utilizes the beam structure to provide a full latching function for the raised Braille dot without energy consumption. Through theoretical derivation and finite element analysis, the performance of the Braille dot actuator is optimized to provide sufficient feedback force and latching force for finger's touchreading. Then, this paper designs a virtual Braille interactive environment based on the CHAI3D, and combines the sense of touch with audio to effectively improve the recognition accuracy and reading efficiency of BVI for Braille through the multi-modal presentation of Braille information. The performance test results of the device show that the average lifting force of the Braille dot actuator is 101.67 mN, the latching force is over 5 N, and the average refresh frequency is 17.1 Hz, which meets the touchreading needs of BVI. User experiments show that the average accuracy rate of BVI subjects in identifying digitized Braille is 95.5%, and subjects have a high subjective evaluation of the system.

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Structuring of electrorheological fluids in polymer matrices for miniature actuators

Ihrens,

Eckert,

Smirnova

et al. 2024

Heliyon

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A Novel Refreshable Braille Display Based on the Layered Electromagnetic Driving Mechanism of Braille Dots

Cited by 11 publications

References 25 publications

Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

Crosstalk-Free Position Mapping for One-Step Reconstruction of Surface Topological Information via Eigenfrequency-Registered Wearable Interface

Development and Evaluation of Refreshable Braille Display and Active Touch-Reading System for Digital Reading of the Visually Impaired

Structuring of electrorheological fluids in polymer matrices for miniature actuators

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