The screen reader is a software program that reads the contents of the screen aloud to a user. Screen readers are used primarily by individuals who are blind. Screen readers can usually only read text that is printed, not painted (i.e., graphics), to the screen. Screen readers cannot distinguish materials other than texts. When it encounters pictures, sounds, or other multimedia information materials, it simply ignores its. It also neglects the columns and tables on a web page, automatically reading from left to right and from top to bottom. In addition, they are unable to read moving text.
The dynamic Braille display is a computerized electro-mechanical device that displays Braille using pins as each line is read. The text-based information is recognized and transformed into Braille code system. An electronic code is sent to the system raising and lowering the pins to form Braille characters that the user can sense by placing their fingers on top of the display. This device serves the similar function of a translator who sees and reads sentences and then presents the impaired person with an electronic coded language.