15 by 15 pixel screen.

[CMOSprinkles]

Alright. The decoder was designed by Minecraftforum user Caramba2654, I only designed the tileable short pulse detector. The decoder itself is also 1 wide tileable, and you can decode the outputs to whatever input you want just by raising and lowering the pistons. The one in the download is just a 3 bit binary to decimal decoder, but that's just so you can understand the concept. Like I said, you can make it decode whatever you want, it's pretty intuitive. However, with the short pulse detector, the longest it could take to decode a signal is 6 ticks, is that too slow?

World Download: http://www.mediafire.com/?gkqq9cwh0nzdgad
MCEdit Schematic: http://www.mediafire.com/?lo996a7tex0a0a2