Support layer, flexible display module and flexible display device

1 . A support layer, comprising a first steel sheet layer and N second steel sheet layers laminated on one surface of the first steel sheet layer, and N being a positive integer;

wherein a groove is provided on the surface of the first steel sheet layer facing the second steel sheet layers, a part of any of the second steel sheet layers corresponding to the groove is provided with a through hole, a cross-sectional width of the through hole is greater than a cross-sectional width of the groove, and the groove is combined with the through hole to form a stepped accommodating space.

2 . The support layer according to claim 1 , wherein a central axis of the groove coincides with a central axis of the through hole.

3 . The support layer according to claim 1 , wherein as N is a positive integer greater than 1, cross-sectional widths of through holes in the second steel sheet layers gradually increase in a direction away from the groove.

4 . The support layer according to claim 1 , wherein a thickness of the support layer is greater than or equal to 100 micrometers and less than or equal to 200 micrometers.

5 . The support layer according to claim 4 , wherein a thickness of the first steel sheet layer and any of the second steel sheet layers is greater than or equal to 5 micrometers and less than or equal to 50 micrometers.

6 . The support layer according to claim 1 , wherein a longitudinal cross-sectional shape of the groove is rectangular, trapezoidal, semi-rounded rectangular, semi-circular or semi-elliptical, and a cross-sectional width of a bottom of the groove is less than or equal to a cross-sectional width of a top of the groove.

7 . The support layer according to claim 1 , wherein a longitudinal cross-sectional shape of the through hole is rectangular, trapezoidal or semi-rounded rectangular, and a cross-sectional width of a side of the through hole close to the groove is less than or equal to a cross-sectional width of a side of the through hole away from the groove.

8 . The support layer according to claim 1 , wherein both the groove and the through hole are provided with a filling layer, and a material of the filling layer is thermoplastic polyurethane elastomer rubber or solid rubber.

9 . A flexible display module, comprising:

a display panel, comprising a bending area and a non-bending area located on both sides of the bending area;

a support layer, arranged on an opposite side of a display surface of the display panel, and the support layer comprising a first steel sheet layer and N second steel sheet layers laminated on one surface of the first steel sheet layer, wherein N is a positive integer, and a groove is provided on the surface of the first steel sheet layer facing the second steel sheet layers, a part of any of the second steel sheet layers corresponding to the groove is provided with a through hole, a cross-sectional width of the through hole is greater than a cross-sectional width of the groove, and the groove is combined with the through hole to form a stepped accommodating space;

wherein the groove of the support layer is arranged corresponding to the bending area, and an opening direction of the groove is consistent with a bending direction of the flexible display module.

10 . The flexible display module according to claim 9 , wherein a cross-sectional width of the through hole in the second steel sheet layer close to the bending direction of the flexible display module in the support layer is equal to a cross-sectional width of the bending area.

11 . The flexible display module according to claim 9 , wherein a central axis of the groove, a central axis of the through hole and a central axis of the bending area coincide.

12 . The flexible display module according to claim 9 , wherein as N is a positive integer greater than 1, cross-sectional widths of through holes in the second steel sheet layers gradually increase in a direction away from the groove.

13 . The flexible display module according to claim 9 , wherein a thickness of the support layer is greater than or equal to 100 micrometers and less than or equal to 200 micrometers.

14 . The flexible display module according to claim 13 , wherein a thickness of the first steel sheet layer and any of the second steel sheet layers is greater than or equal to 5 micrometers and less than or equal to 50 micrometers.

15 . The flexible display module according to claim 9 , wherein a longitudinal cross-sectional shape of the groove is rectangular, trapezoidal, semi-rounded rectangular, semi-circular or semi-elliptical, and a cross-sectional width of a bottom of the groove is less than or equal to a cross-sectional width of a top of the groove.

16 . The flexible display module according to claim 9 , wherein a longitudinal cross-sectional shape of the through hole is rectangular, trapezoidal or semi-rounded rectangular, and a cross-sectional width of a side of the through hole close to the groove is less than or equal to a cross-sectional width of a side of the through hole away from the groove.

17 . The flexible display module according to claim 9 , wherein both the groove and the through hole are provided with a filling layer, and a material of the filling layer is thermoplastic polyurethane elastomer rubber or solid rubber.

18 . A flexible display device, comprising a driving chip and a flexible display module, and wherein the flexible display module comprises a display panel and a support layer, and the display panel comprises a bending area and a non-bending area located on both sides of the bending area, and the support layer is arranged on an opposite side of a display surface of the display panel, and the support layer comprises a first steel sheet layer and N second steel sheet layers laminated on one surface of the first steel sheet layer, N is a positive integer, and a groove is provided on the surface of the first steel sheet layer facing the second steel sheet layers, and a part of any of the second steel sheet layers corresponding to the groove is provided with a through hole, a cross-sectional width of the through hole is greater than a cross-sectional width of the groove, and the groove is combined with the through hole to form a stepped accommodating space;

wherein the groove of the support layer is arranged corresponding to the bending area, and an opening direction of the groove is consistent with a bending direction of the flexible display module.

19 . The flexible display device according to claim 18 , wherein a central axis of the groove, a central axis of the through hole and a central axis of the bending area coincide.

20 . The flexible display device according to claim 18 , wherein as N is a positive integer greater than 1, cross-sectional widths of through holes in the second steel sheet layers gradually increase in a direction away from the groove.