Optimus Tactus Keyboard

 Each key is a stand-alone display that shows the function currently assigned to it.

Optimus’s customizable layout allows convenient use of any language—Cyrillic, Ancient Greek, Georgian, Arabic, Quenya, hiragana, etc.—as well as of any other character set: notes, numerals, special symbols, HTML codes, math functions and so on to infinity. 

Keyboard dimensions length 537 mm (21.1″) width 173 mm (6.8″) height 38 mm (1.5″) key 20.2×20.2 mm (0.8″×0.8″)

Each of the 113 displays technology OLED viewable area 10.1×10.1 mm (0.4″×0.4″) resolution 48×48 pixels frame rate 10 frames per second minimum colors 65 536 viewing angle 160°

Compatibility Connection USB 2.0 Control Optimus Configurator software

 System requirements
PC with installed OS Windows XP or Vista, with a USB 1.1 (or better 2.0) port; Mac OS X 10.5.1 or higher.

At least 20 MB of free space on hard drive.

At least 256 MB of RAM. 

 basic source of this post : http://www.artlebedev.com/everything/optimus/