Backlight modules with optical films having a lug protruding into a groove of a backboard

1 . A backlight module, comprising:

a backboard, comprising a bottom plate and lateral plates connected with the bottom plate, wherein the lateral plates each extends along a light emitting direction of the backlight module to define a chamber together with the bottom plate, and at least one groove is provided on inner walls of the lateral plates;

a light guide plate, disposed on the bottom plate; and

an optical film group, comprising a film body and at least one first lug, wherein the film body is located in the chamber and disposed on the light guide plate, and the first lug extends from a lateral side of the film body towards the backboard and corresponds to the groove one by one; and

wherein the first lug correspondingly protrudes into the groove, the inner wall and an outer wall of at least one of the lateral plates form a protrusion corresponding to the groove, and the protrusion extends in a direction away from the first lug.

2 . The backlight module according to claim 1 , wherein there is a first gap between an outer wall of the first lug and an inner wall of the groove correspondingly arranged.

3 . The backlight module according to claim 1 , wherein a light shielding layer is disposed on a side of the optical film group away from the bottom plate, and an orthographic projection of the light shielding layer on the bottom plate at least covers an orthographic projection of edges of the film body on the bottom plate.

4 . The backlight module according to claim 3 , wherein the light shielding layer covers a side of the first lug away from the bottom plate.

5 . The backlight module according to claim 1 , wherein there is a second gap between the light guide plate and the lateral plate, and the second gap is located on a side of the first lug adjacent to the bottom plate.

6 . The backlight module according to claim 5 , wherein a distance between a surface of the light guide plate away from the bottom plate and the bottom plate is greater than a distance between a surface of the groove close to the bottom plate and the bottom plate.

7 . The backlight module according to claim 5 , further comprising at least one fixing block located in the second gap and abutting against the light guide plate and the lateral plate.

8 . The backlight module according to claim 7 , wherein a hardness of the fixing block is less than a hardness of the lateral plate and is less than a hardness of the light guide plate.

9 . The backlight module according to claim 1 , wherein the light guide plate comprises a light guide body and at least one second lug connected with the light guide body; the film body is located on the light guide body; and the first lug is located on the second lug, and the second lug correspondingly protrudes into the groove.

10 . The backlight module according to claim 9 , wherein a surface of the groove close to the bottom plate is flush with a surface of the bottom plate close to the second lug.

11 . The backlight module according to claim 1 , wherein a buffer layer is provided between an outer wall of the first lug and an inner wall of the groove correspondingly arranged.

12 . The backlight module according to claim 1 , wherein the inner wall and the outer wall of the at least one of lateral plates are both recessed toward a side away from the optical film group to define the groove.

13 . The backlight module according to claim 1 , wherein the light guide plate comprises a light guide body and at least one second lug connected with the light guide body; the film body is located on the light guide body; and the first lug is located on the second lug, and the second lug correspondingly protrudes into the groove; and

wherein a side wall of the groove close to the bottom plate is coplanar with an upper surface of the bottom plate.

14 . The backlight module according to claim 1 , wherein there is a second gap between the light guide plate and the lateral plate, and the second gap is located on a side of the first lug adjacent to the bottom plate; the backlight module further comprises at least one fixing block located in the second gap and abutting against the light guide plate and the lateral plate; and

wherein a side of the fixing block away from the bottom plate is lower than a side of the groove close to the bottom plate.

15 . A display module, comprising:

a backlight module, comprising:

a backboard, comprising a bottom plate and lateral plates connected with the bottom plate, wherein the lateral plates each extends along a light emitting direction of the backlight module to define a chamber together with the bottom plate, and at least one groove is provided on inner walls of the lateral plates;

a light guide plate, disposed on the bottom plate; and

an optical film group, comprising a film body and at least one first lug, wherein the film body is located in the chamber and disposed on the light guide plate, and the first lug extends from a lateral side of the film body towards the backboard and corresponds to the groove one by one;

a display panel, disposed on a light emitting side of the backlight module; and

a cover plate, located on a side of the display panel away from the backlight module and fixedly connected to the display panel,

wherein the first lug correspondingly protrudes into the groove, and the cover plate is fixedly connected to end surface of the lateral plates away from the bottom plate, the inner wall and an outer wall of at least one of the lateral plates form a protrusion corresponding to the groove, and the protrusion extends in a direction away from the first lug.

16 . The display module according to claim 15 , wherein there is a first gap between an outer wall of the first lug and an inner wall of the groove correspondingly arranged.

17 . The display module according to claim 15 , wherein a light shielding layer is disposed on a side of the optical film group away from the bottom plate, and an orthographic projection of the light shielding layer on the bottom plate at least covers an orthographic projection of edges of the film body on the bottom plate; and/or

wherein a light shielding layer is disposed on a side of the optical film group away from the bottom plate, and the light shielding layer covers a side of the first lug away from the bottom plate.

18 . The display module according to claim 15 , wherein there is a second gap between the light guide plate and the lateral plate, and the second gap is located on a side of the first lug adjacent to the bottom plate; a distance between a surface of the light guide plate away from the bottom plate and the bottom plate is greater than a distance between a surface of the groove close to the bottom plate and the bottom plate.

19 . The display module according to claim 15 , wherein there is a second gap between the light guide plate and the lateral plate, and the second gap is located on a side of the first lug adjacent to the bottom plate; the backlight module further comprises at least one fixing block located in the second gap and abutting against the light guide plate and the lateral plate.

20 . The display module according to claim 15 , wherein the light guide plate comprises a light guide body and at least one second lug connected with the light guide body; the film body is located on the light guide body; and the first lug is located on the second lug, and the second lug correspondingly protrudes into the groove.