Backlight module, display device and driving method thereof

1. A backlight module comprising: a first light guide plate and a second light guide plate arranged oppositely, a first light source and a second light source;

wherein a surface of the first light guide plate facing the second light guide plate is a light exit surface of the first light guide plate; the first light source is arranged at a light entrance surface of the first light guide plate; the second light source is arranged at a light entrance surface of the second light guide plate; the first light guide plate comprises a light guide element guiding light along a direction perpendicular to the light exit surface of the first light guide plate; the second light guide plate comprises a scattering element;

wherein the first light guide plate comprises a light guide plate body and a narrow viewing angle structure arranged on a light exit surface of the light guide plate body of the first light guide plate, and the narrow viewing angle structure is capable of reducing a divergence degree of light emitted from the first light source and exiting from the light guide plate body of the first light guide plate;

wherein the narrow viewing angle structure comprises a plurality of blades parallel to each other, the plurality of blades are arranged at equal intervals and perpendicular to the light exit surface of the light guide plate body of the first light guide plate; and

wherein an orthographic projection of the scattering element on the light exit surface of the light guide plate body of the second light guide plate overlaps with an orthographic projection of the blades on the light exit surface of the light guide plate body of the first light guide plate.

2. The backlight module according to claim 1 , wherein a surface of the light guide plate body of the first light guide plate departing from the second light guide plate is the light entrance surface of the first light guide plate.

3. The backlight module according to claim 1 , wherein a lateral surface of the light guide plate body of the first light guide plate is the light entrance surface of the first light guide plate, and the backlight module further comprises a reflective plate arranged on a side of the light guide plate body of the first light guide plate departing from the second light guide plate.

4. The backlight module according to claim 1 , wherein a surface of the light guide plate body of the first light guide plate departing from the second light guide plate is the light entrance surface of the first light guide plate.

5. The backlight module according to claim 1 , wherein a lateral surface of the light guide plate body of the first light guide plate is the light entrance surface of the first light guide plate, and the backlight module further comprises a reflective plate arranged on a side of the light guide plate body of the first light guide plate departing from the second light guide plate.

6. A backlight module comprising: a first light guide plate and a second light guide plate arranged oppositely, a first light source and a second light source;

wherein a surface of the first light guide plate facing the second light guide plate is a light exit surface of the first light guide plate; the first light source is arranged at a light entrance surface of the first light guide plate; the second light source is arranged at a light entrance surface of the second light guide plate; the first light guide plate comprises a light guide element guiding light along a direction perpendicular to the light exit surface of the first light guide plate; the second light guide plate comprises a scattering element;

wherein the first light guide plate comprises a light guide plate body and a narrow viewing angle structure arranged on a light exit surface of the light guide plate body of the first light guide plate, and the narrow viewing angle structure is capable of reducing a divergence degree of light emitted from the first light source and exiting from the light guide plate body of the first light guide plate;

wherein the narrow viewing angle structure comprises a plurality of convergent lenses arranged in an array on the light exit surface of the light guide plate body of the first light guide plate; and

wherein an orthographic projection of the scattering element on the light exit surface of the light guide plate body of the second light guide plate is staggered from an orthographic projection of the convergent lenses on the light exit surface of the light guide plate body of the first light guide plate.