The disclosure provides a mask plate assembly, a method for fabricating an electroluminescent layer, a display panel and a method for driving the same. The mask plate assembly includes a first color mask plate, a second color mask plate, and a third color mask plate each having a plurality of rectangular openings. First openings of the first color mask plate and second openings of the second color mask plate are of a length in a row direction, which is substantially twice as that of third openings of the third color mask plate in the row direction. When the respective mask plates are aligned with one another, the first openings, the second openings, and the third openings are arranged alternately in an order of a first opening, a third opening, a second opening, and another third opening.