Support film and forming method thereof, display panel and manufacturing method thereof

1. A support film for a flexible display panel, the display panel comprising a display area and a bonding area, wherein the support film comprises:

a first support portion and a second support portion which are juxtaposed on a first surface of a substrate of the display panel, wherein the first support portion is located in the bonding area, the second support portion extends from the display area to the bonding area, and a groove is provided between the first support portion and the second support portion to expose the first surface, wherein,

the first support portion comprises:

a first support base material and a first adhesive material which are stacked, wherein the first adhesive material adheres the first support base material on the first surface,

wherein the second support portion comprises:

a second support base material and a second adhesive material which are stacked, wherein the second adhesive material adheres the second support base material on the first surface,

wherein the first support base material has an elastic modulus different from that of the second support base material, the first support base material has a thickness different from that of the second support base material, and the first support portion has a thickness equal to that of the second support portion,

wherein the elastic modulus of the first support base material located in the bonding area is greater than that of the second support base material extended from the display area to the bonding area, the thickness of the second support base material is greater than that of the first support base material, a thickness of the second adhesive material is smaller than that of the first adhesive material, and a sum of the thicknesses of the first support base material and the first adhesive material is the same as that of the second support base material and the second adhesive material.

2. The support film according to claim 1 , wherein

the elastic modulus of the first support base material is 2 Gpa to 8 Gpa, and an elastic modulus of the first adhesive material is 100 Kpa to 400 Kpa;

in a case where the display panel is a curved display panel, the elastic modulus of the second support base material is 10 Mpa to 500 Mpa;

in a case where the display panel is a folded display panel, the elastic modulus of the second support base material is 100 Gpa to 400 Gpa; and

an elastic modulus of the second adhesive material is 1 Kpa to 400 Kpa.

3. The support film according to claim 2 , wherein

the first support base material is made of a polyester resin material, and

the second support base material is made of a metal material or a polymer material.

4. The support film according to claim 1 , wherein

a transmittance of the first support base material for visible light is not less than 30%.

5. A forming method of the support film according to claim 1 , comprising:

adhering a first support portion layer on the first surface, wherein the first support portion layer comprises a first support base material layer and a first adhesive material layer which are stacked, the first adhesive material layer adheres the first support base material layer on the first surface, and a material adhesion of the first adhesive material layer makes the first adhesive material layer easy to be stripped but not easy after being irradiated by ultraviolet (UV) light;

cutting the first support portion layer perpendicular to the first surface, wherein a cutting site is located in the bonding area;

stripping a portion of the first support portion layer, and remaining only a portion located in the bonding area from the cutting site to form the first support portion;

adhering the second support portion on the first surface, wherein the second support portion comprises the second support base material and the second adhesive material which are stacked, and the groove is formed between the first support portion and the second support portion; and

irradiating the first support portion with UV light to increase an adhesion of the first support portion.

6. A forming method of the support film according to claim 1 , comprising:

adhering a first support portion layer on the first surface, wherein the first support portion layer comprises a first support base material layer and a first adhesive material layer which are stacked, the first adhesive material layer adheres the first support base material layer on the first surface, and a material adhesion of the first adhesive material layer makes the first adhesive material layer not easy to be stripped but easy after being irradiated by ultraviolet (UV) light;

cutting the first support portion layer perpendicular to the first surface, with a cutting site in the bonding area;

irradiating the first support portion layer corresponding to the display area from the cutting site with UV light to reduce an adhesion of the irradiated first support portion layer;

stripping the irradiated first support portion layer, and forming a remaining portion into the first support portion; and

adhering the second support portion on the first surface, wherein the second support portion comprises the second support base material and the second adhesive material which are stacked, and the groove is formed between the first support portion and the second support portion.

7. A display panel, comprising:

a substrate;

the support film according to claim 1 formed on a first surface of the substrate; and

a functional module layer formed on a second surface of the substrate opposite to the first surface.

8. The manufacturing method of the display panel according to claim 7 , comprising:

adhering a temporary release film mother layer on a second surface of a substrate of a display panel motherboard, wherein the display panel motherboard comprises a plurality of display panels arranged in an array;

adhering a first support portion mother layer on a first surface of the substrate of the display panel motherboard opposite to the second surface, wherein the first support portion mother layer comprises a first support base material mother layer and a first adhesive material mother layer which are stacked, the first adhesive material mother layer adheres the first support base material mother layer on the first surface, and a material adhesion of the first adhesive material mother layer makes the first adhesive material mother layer easy to be stripped but not easy after being irradiated by ultraviolet (UV) light;

cutting the first support portion mother layer, the display panel motherboard and the temporary release film mother layer perpendicular to the first surface of the substrate of the display panel motherboard to form a plurality of independent display panels, wherein a first support portion layer is adhered to the first surface of the substrate of the display panel, and a temporary release film is adhered to the second surface of a flexible substrate of the display panel, and the first support portion layer comprises a first support base material layer and a first adhesive material layer which are stacked;

removing the temporary release film and forming the functional module layer on the second surface of the substrate of the display panel;

cutting the first support portion layer perpendicular to the first surface of the substrate of the display panel, wherein a cutting site is located in the bonding area;

stripping a portion of the first support portion layer, and remaining only a portion located in the bonding area from the cutting site to form the first support portion;

adhering the second support portion on the first surface, wherein the second support portion comprises the second support base material and the second adhesive material which are stacked, and the groove is formed between the first support portion and the second support portion;

irradiating the first support portion with UV light to increase an adhesion of the first support portion; and

forming an electronic device on the second surface of the substrate corresponding to the bonding area of the display panel.

9. The manufacturing method of the display panel according to claim 7 , comprising:

adhering a temporary release film mother layer on a second surface of a substrate of a display panel motherboard, wherein the display panel motherboard comprises a plurality of display panels arranged in an array;

adhering a first support portion mother layer on a first surface of the substrate of the display panel motherboard opposite to the second surface, wherein the first support portion mother layer comprises a first support base material mother layer and a first adhesive material mother layer which are stacked, the first adhesive material mother layer adheres the first support base material mother layer on the first surface, and a material adhesion of the first adhesive material mother layer makes the first adhesive material mother layer not easy to be stripped but easy after being irradiated by UV light;

cutting the first support portion mother layer, the display panel motherboard and the temporary release film mother layer perpendicular to the first surface of the substrate of the display panel motherboard to form a plurality of independent display panels, wherein a first support portion layer is adhered to the first surface of the substrate of the display panel, and a temporary release film is adhered to the second surface of a flexible substrate of the display panel, and the first support portion layer comprises a first support base material layer and a first adhesive material layer which are stacked;

removing the temporary release film and forming an electronic device on the second surface of the substrate corresponding to the bonding area of the display panel;

cutting the first support portion layer perpendicular to the first surface of the substrate of the display panel, wherein a cutting site is located in the bonding area;

irradiating the first support portion layer corresponding to the display area from the cutting site with UV light to reduce an adhesion of the irradiated first support portion layer;

stripping the irradiated first support portion layer, and forming a remaining portion into the first support portion;

adhering the second support portion on the first surface, wherein the second support portion comprises the second support base material and the second adhesive material which are stacked, and the groove is formed between the first support portion and the second support portion; and

forming the functional module layer on the second surface of the substrate of the display panel.

10. A support film for a flexible display panel, comprising:

a release film;

a first support portion and a second support portion which are juxtaposed on a first surface of the release film, wherein a groove is provided between the first support portion and the second support portion to expose the first surface,

wherein the first support portion comprises:

a first support base material and a first adhesive material which are stacked, wherein the first adhesive material adheres the first support base material on the first surface,

wherein the second support portion comprises:

a second support base material and a second adhesive material which are stacked, wherein the second adhesive material adheres the second support base material on the first surface,

wherein the first support base material has an elastic modulus different from that of the second support base material, the first support base material has a thickness different from that of the second support base material, and the first support portion has a thickness equal to that of the second support portion,

wherein the elastic modulus of the first support base material located in the bonding area is greater than that of the second support base material extended from the display area to the bonding area, the thickness of the second support base material is greater than that of the first support base material, a thickness of the second adhesive material is smaller than that of the first adhesive material, and a sum of the thicknesses of the first support base material and the first adhesive material is the same as that of the second support base material and the second adhesive material.

11. The support film according to claim 10 , further comprising:

a protective film adhered to a side of the first support portion and a side of the second support portion away from the release film.

12. The support film according to claim 10 , wherein

the elastic modulus of the first support base material is 2 Gpa to 8 Gpa, and an elastic modulus of the first adhesive material is 100 Kpa to 400 Kpa;

in a case where the display panel is a curved display panel, the elastic modulus of the second support base material is 10 Mpa to 500 Mpa;

in a case where the display panel is a folded display panel, the elastic modulus of the second support base material is 100 Gpa to 400 Gpa; and

an elastic modulus of the second adhesive material is 1 Kpa to 400 Kpa.

13. The support film according to claim 10 , wherein

a transmittance of the first support base material for visible light is not less than 30%.

14. A manufacturing method of the support film according to claim 10 , comprising:

stacking the first support base material and the first adhesive material to obtain the first support portion;

stacking the second support base material and the second adhesive material to obtain the second support portion;

juxtaposing the first support portion and the second support portion on a first surface of a release film, wherein a first interval is provided between the first support portion and the second support portion;

punching the first support portion and the second support portion in alignment with the first interval to form a second interval with a width greater than that of the first interval, thereby forming the groove; and

fully cutting the first support portion and the release film at a side of the first support portion away from the second support portion, and fully cutting the second support portion and the release film at a side of the second support portion away from the first support portion, thereby forming the support film conforming to size specifications.

15. The manufacturing method of the support film according to claim 14 , further comprising:

adhering a protective film on a side of the first support portion and a side of the second support portion away from the release film.