A traditional Braille terminal links to a PC and provided a single line of text. These devices cost upwards of £1800 plus the cost of a computer and require training putting them out of reach of most blind people. In 2007 it was found that only 10% of blind children could read Braille, due to access in education compared to 50% in the 1960's. My solution it to build a low cost all in one system which can also teach, much like the Khan Academy.
The reason a Braille terminal is so expensive is the cells which push each dot on demand. What I will do is use a cnc type mechanism to push cheap resettable 'pins' in order to provide a full page of information. A complete computer should hopefully come in under £200.