In the current information age, the traditional paper-based Braille books have many deficiencies in disseminating knowledge, and are gradually unable to meet the Braille reading needs of the visually impaired. Inspired by wearable devices, this article designs a fingertip Braille display system based on touch screen interaction. According to the structural characteristics of standard Braille, the way visually impaired people perceive Braille, and the miniaturization requirements of fingertip devices, this article designs a new type of Braille dot actuator and optimizes its structure and parameters through finite element analysis. The results of performance analysis and user experiments show that the proposed Braille dot actuator has the advantages of high refresh rate, low power consumption and small size, which could achieve locking operations at the highest and lowest positions. The Braille display system combines the portable fingertip device with the touch screen that can refresh data, and employs the vibrotactile feedback of four piezoelectric ceramic actuators to guide the movement direction of the finger on the touch screen, providing a new way for visually impaired people to read Braille conveniently.