Hi Werner (sounds german),

there are a lot of MP3-Player with a display like Sandisk Sansa, Creative Zen or Sony Walkman.
They all show album cover stored in the Id3-Tags.
You should replace the standard album cover with your own jpeg-files by using a ID3 tagging-sofware. Use MS Paint or a graphic suit and “paint” a white cover with the chordsheet in black. Save it as jpeg.

Ralf