Currently, traditional Braille teaching tools such as Braille books can hardly meet the digital reading needs of the blind or visually impaired (BVI), and the developed refreshable Braille displays (RBDs) still need to be further optimized in terms of volume, locking force, energy consumption and other aspects. To help BVI read digitally conveniently, a low-power Braille display module is proposed, and a wearable rotating RBD is designed by combining a rotating structure. Firstly, an electromagnetic actuator is designed based on the principle of electromagnetic drive. This actuator can rely on electromagnetic characteristics to lock the raised Braille dots without energy consumption. Then, through the force analysis and finite element analysis of the Braille dot actuator in different states, the key parameters of the Braille dot actuator that meet the design requirements are determined. The performance test results of the device show that the average refresh frequency of the Braille dot actuator is 19.3 Hz, and the average locking force is 166 mN, which can meet the needs of BVI for touch reading. User experiments show that the average accuracy of blind subjects in recognizing Braille with the wearable rotating RBD reaches 94.66%. Therefore, the wearable rotating RBD provides a convenient digital Braille reading method for BVI.