Abstract：
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 touch-reading. 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 touch-reading 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.
摘要：
传统的盲文阅读方式限制了数字时代盲人或视障人士（BVI）的阅读体验。为了提高BVI的阅读便利性，本文提出了一种低成本、可刷新的盲文显示装置,解决了现有装置存在的能耗高、闭锁力低的问题。Further,盲文显示设备与3D系统触摸设备相结合，在CHAI3D虚拟环境的帮助下，开发了用于BVI数字阅读的有源盲文触摸阅读系统。首先,根据BVI的实际需要触摸和阅读盲文点，本文利用梁结构为凸起的盲文点提供了完整的闭锁功能，而不消耗能量。通过理论推导和有限元分析,盲文点致动器的性能进行了优化，为手指的触摸阅读提供足够的反馈力和锁定力。然后，本文设计了一个基于CHAI3D的虚拟盲文交互环境,并将触觉与音频相结合，通过盲文信息的多模态呈现，有效提高BVI对盲文的识别准确率和阅读效率。装置的性能测试结果表明，盲文点致动器的平均提升力为101.67mN，锁定力超过5N,平均刷新频率为17.1Hz，满足BVI的触摸阅读需求。用户实验表明,BVI受试者识别数字化盲文的平均准确率为95.5%,主体对系统的主观评价较高。
