The whole keyboard is the 9 oblong buttons at the top.The "screen" is the line of braille at the bottom, which is mechanically manipulated by the CPU to match the text it needs to display. It changes instantly as you move from line to line.

The whole keyboard is the 9 oblong buttons at the top. The "screen" is the line of braille at the bottom, which is mechanically manipulated by the CPU to match the text it needs to display. It changes instantly as you move from line to line.