A printed circuit board electrically connected to a display includes a plurality of display control units, a plurality of first forward different signal lines, at least one second forward differential signal line, and a plurality of zero-ohm resistors. The display control units provide differential signals for the display through the differential signal lines and the zero-ohm resistors. Any two of the first forward differential signal lines are electrically connected together at one end to form a first node. One end of the second forward differential signal line is electrically connected to the first node. The other end is electrically connected to another first forward differential signal line to form a second node. The zero-ohm resistors are placed on the first forward differential signal lines and the second forward differential signal lines and are electrically connected between the display control units and the display.