BRAILLE DISPLAY ARCHITECTURE FOR PORTABLE RECEIVERS
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2001-Dec-31
A Braille Display Architecture has been proposed for applications in RF receivers including two-way port- able radios and pagers. This Archicture provides for non- voiced communications and graphics display capabilities for the visually impaired. A simplified block diagram of a receiver incorporating the braille display capabilities is shown below: Braflle Pixels Ii \ Piezoelectric Elastomn*r CnYI mr baaa a-m" The received RF signal is processed through a stand- ard receiver with the demodulated base band digital sig- nal being sourced to a microprocessor (UP). The UP locates the braille equivalent to the received alpha- numeric message from the EEPROM (or ROM) and generates a binary word that contains the X-Y coordi- nates to the braille pixels that are to be actuated. This binary word is sent to the X-Y Impulse Driver Array where it is translated and triggers a mechanical pulse at the appropriate piezoelectric actuator. This pulse trips the appropriate spring loaded pixel above the retention tab threshold, thereby allowing the spring to fully extend the selected pixel. An Elastomer cover over the braille array is utilized to prevent intrusion of foreign material into the mechanical mechanisms. A detailed diagram of the braille drive mechanisms is shown below.