Braille is a notation tracking a cursor, and reading the screen and routing are accomplished by the fingers moving across raised dots. This article describes the technology utilized by transitory, or refreshable, braille computer displays. Braille has come into use worldwide, and can even be used in those languages that have pictorial alphabets, as well as in languages with phonetic- based alphabets.
Braille is a useful alphabet for blind people when they use computers.
The design of Braille displays and their common features are described below. If she takes courses in mathematics, chemistry, music or foreign languages, she also needs to learn the proper notation used in these subjects. Figure 1 gives an example. Above each Braille cell the corresponding print character is shown. The first character in Fig.1 announces the capital B character.