Backlight module and display module

The invention provides a backlight module and a display module. The backlight module comprises a back plate, an optical film, a fastener and a locking frame. A containing cavity is formed in the back plate, the edge of the back plate comprises a first side part, a second side part, a third side part and a fourth side part which are sequentially connected, the first side part and the third side part are oppositely arranged, the second side part and the fourth side part are oppositely arranged, and the first side part, the second side part and the third side part are bent to form mounting grooves respectively. Mounting holes are formed in the first side part, the second side part and the third side part; the optical film and the fastening piece are arranged in the containing cavity, a fixing hole is formed in the edge of the optical film, and the fixing hole and the mounting hole are matched with the fastening piece so that the edge of the optical film can be fixed in the mounting groove; and the locking frame