Radio controlled clock with 64x64 pixel LED-display. Project description and source files are downloadable from my webspace (see link on the left, below pictures). The description is written in German.
64x64 pixel LED-display (4096 LEDs)
functions for displaying text and graphics
display can be switched off to save energy
external DCF-77 receiver
quartz crystal for exact time (0,5%)
consideration of leap years and seconds
Build instructions and all necessary files are available in German language at http://www.marconiesen.de/_pixelclock/PixelClock.zip