12864 LCD for an independent printing.This Full Graphic Smart Controller contains a SD-Card reader, an
rotary encoder and a 128 x 64 dot matrix LCD display. You can easy
connect it to your RAMPS board using the "smart adapter"
included.More info here
LCD 2004, for an independent printing, is an Arduino display screen, with 4 lines and 20 characters. The smart controller includes an SD card reader and encoder.You can easily connect it to your RAMPS using the included adaptater.More info..