The backlight module and a display device

The utility model discloses a backlight module and display device, wherein backlight unit includes a backlight unit and the 2nd backlight unit. A backlight unit includes first lid, first light guide plate, first light source and at least one first optics diaphragm. The first surface of the first lid of first light guide plate configuration. A light source installation is in the first surface and lie in one side of first light guide plate. First optics diaphragm disposes between first surface and first light guide plate. The 2nd backlight unit detachably disposes in a backlight unit to including second lid, second light guide plate, secondary light source and at least one second optics diaphragm. The second light guide plate disposes in the third surface of second lid, third surface towards first surface. The 2nd light source installation is in third surface and lie in one side of second light guide plate. Second optics diaphragm disposes between a backlight unit and second light guide plate. The utility model provides a backlight unit's structure is convenient for repeatedly disassemble and assemble.