Backlight module and terminal

A backlight module configured to support a display screen, comprising:

• a back frame which is in a box shape and opens at an opening side thereof;
• a sealant frame which is in a form of hollowed closed frame and is accommodated within the back frame by abutting against inside of the back frame;
• and
• a light guide element which fits with the back frame and the sealant frame, and comprises a light guide plate and a membrane, both the light guide plate and the membrane being located within a region surrounded by the sealant frame, and the membrane being further located on the light guide plate;
• wherein the sealant frame is formed with a step structure on an inner side face thereof, and the step structure comprises a base portion in a form of hollowed closed shape and a surrounding wall votrudin vertically from an outer edge of the base portion towards one side of the bas portion, and an upper surface of the base portion in the step structure functions as a step surface which faces towards the opening side of the back frame and is configured to support the display screen;
• wherein the sealant frame is further provided with at least one positioning notch, each of which is formed to be recessed at a lower portion thereof into both the base portion and the surrounding wall of the step structure and to form a bottom wail of the positioning notch, and in turn to divide the step surface into segmented surfaces spaced apart from each other to cooperate collectively to function as a primary supporting surface configured to support the light guide element;
• and the membrane is provided with at least one positioning lug at an edge thereof, which is arranged to be positioned below the step surface and to extend into the positioning notch in a snap-fit manner;
• and
• wherein the backlight module further comprises at least one positioning insert, which comprises a plate piece functioning as an auxiliary support whose upper surface further functions as an auxiliary supporting surface, and the auxiliary supporting surface is arranged to face towards the opening side of the back frame, the positioning insert being installed within a respective positioning notch and the auxiliary supporting surface being flush with the step surface.