Backlight module including privacy structure with triangular prism structure and display apparatus including the same

A backlight module, comprising:

• a surface light source;
• a first light guide plate laminated with the surface light source in a thickness direction, wherein the first light guide plate is on a light-exiting side of the surface light source, and a side of the first light guide plate proximal to the surface light source comprises a plurality of first prism structures;
• and
• a first light source on a side surface of the first light guide plate, wherein an orthographic projection of the first light source onto a plane, where a light-exiting surface of the surface light source is located, does not overlap with that of the first light guide plate onto the plane;
• wherein the surface light source is a collimation surface light source, the collimation surface light source comprises a privacy structure and a second light guide plate that are laminated in the thickness direction;
• the second light guide plate is on a side of the privacy structure distal from the first light guide plate, and a side of the second light guide plate distal from the privacy structure comprises a plurality of second prism structures;
• and
• the collimation surface light source further comprises a second light source on a side surface of the second light guide plate, and an orthographic projection of the second light source onto a plane, where a light-exiting surface of the collimation surface light source is located, does not overlap with that of the second light guide plate onto the plane.