How does a refreshable braille display work?

A screen reader sends the information to the hardware that then operates the pins of the braille cell to make the resulting electronic Braille. The screen reader comes with a variety of different settings that can be tailored to a user’s preferences. For example, you can choose the type of Braille to be displayed or even choose a 6 or 8 dot Braille preference.    

Most displays will work by displaying one line of braille at a time, which corresponds to the line that the computer is focused on. Many Braille Displays also feature keys on the unit themselves that mirror the functions of a computer keyboard.