Carrier film, display module, and display module preparation method

Abstract

A carrier film (100), a display module, and a display module preparation method. The carrier film (100) is configured to attach a flexible display panel (200) to a special-shaped cover plate (400). The carrier film (100) comprises a carrying region (110) and a handle region (120) connected to the carrying region (110). The carrying region (110) is configured to be attached to a non-display side of the flexible display panel (200). A first hollowed portion is provided in a first boundary region (130) connecting the handle region (120) and the carrying region (110).

Description

A carrying film, a display module and a preparation method of the display module TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of display, and particularly relates to a carrying film, a display module and a preparation method of the display module. BACKGROUND

[0002] The carrying film is used for bonding a flexible display panel and a special-shaped cover plate. In the transfer and / or subsequent process after bonding, the carrying film is prone to causing the flexible display panel to have film printing and / or bulging defects.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] By using one or more embodiments of the present disclosure, the technical problem that the carrying film is prone to causing the flexible display panel to have film printing and / or bulging defects can be at least partially solved.

[0005] The carrying film provided by the embodiments of the present disclosure is used for bonding a flexible display panel and a special-shaped cover plate. The carrying film comprises a carrying area and a handle area connected with the carrying area. The carrying area is used for bonding a non-display side of the flexible display panel. The first interface area where the handle area and the carrying area are connected is provided with a first hollow part.

[0006] In some embodiments, the first hollow part comprises any one or several of a first cavity, a first through hole and a first groove.

[0007] In some embodiments, the first interface area is provided with one or more first cavities, and / or one or more first through holes, and / or one or more first grooves. A plurality of first cavities are arranged in the first interface area at intervals along the extension direction of the first interface area, and / or a plurality of first through holes are arranged in the first interface area at intervals along the extension direction of the first interface area, and / or a plurality of first grooves are arranged in the first interface area at intervals along the extension direction of the first interface area.

[0008] In some embodiments, the first cavity and / or the first through hole and / or the first groove are long strips. The extension direction of the long strips is the same as the extension direction of the first interface area.

[0009] In some embodiments, a ratio of a depth of the first cavity in the first interface region thickness direction to a thickness of the first interface region is (1:4) to (3:4); and / or, a ratio of a depth of the first groove in the first interface region thickness direction to the thickness of the first interface region is (1:4) to (3:4).

[0010] In some embodiments, a ratio of a thickness of the handle region to a thickness of the carrying region is (1:4) to (3:4).

[0011] In some embodiments, the flexible display panel is connected with a flexible circuit board, the carrying film further comprises a circuit region, the circuit region is connected with the carrying region, and the circuit region is configured to be attached with the flexible circuit board.

[0012] In some embodiments, the circuit region and the carrying region are connected with each other at a second interface region, and the second interface region is provided with a second hollow part, the second hollow part comprising any one or more of a second cavity, a second through hole, and a second groove.

[0013] Embodiments of the present disclosure further provide a display module, comprising a flexible display panel and the carrying film as described above, and the carrying region in the carrying film is attached to the non-display side of the flexible display panel.

[0014] In some embodiments, the display module further comprises a special-shaped cover plate, and the special-shaped cover plate is attached to the display side of the flexible display panel.

[0015] Embodiments of the present disclosure further provide a preparation method of the display module as described above, the preparation method comprising the following steps:

[0016] a carrying film attaching step of providing a carrying film and a flexible display panel, and attaching a carrying region in the carrying film to a non-display side of the flexible display panel;

[0017] a special-shaped cover plate attaching step of providing a special-shaped cover plate, and attaching a display side of the flexible display panel to the special-shaped cover plate through the carrying film;

[0018] a carrying film removing step of removing the carrying film from the non-display side of the flexible display panel; and,

[0019] a back heat dissipation film attaching step of providing a back heat dissipation film, and attaching the back heat dissipation film to the non-display side of the flexible display panel.

[0020] In some embodiments, before the back heat dissipation film is attached to the non-display side of the flexible display panel, the carrying region remains attached to the non-display side of the flexible display panel.

[0021] The embodiments of the present disclosure have at least the following beneficial effects:

[0022] The bearing film has a first hollow part arranged at the first boundary area connecting the handle area and the bearing area. The first hollow part can reduce the cross-sectional area of the first boundary area, thereby reducing the elastic modulus of the first boundary area. After the elastic modulus of the first boundary area is reduced, the stress generated on the first boundary area when the handle area is bent can be reduced, and the stress borne by the flexible display panel edge can be further reduced, thereby avoiding the film printing and / or bulging of the flexible display panel to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] FIG. 1 shows a structural schematic diagram of a special-shaped cover plate;

[0025] FIG. 2 shows a structural schematic diagram of the special-shaped cover plate in FIG. 1 from another angle;

[0026] FIG. 3 shows a cross-sectional view of the special-shaped cover plate and the flexible display panel after being attached;

[0027] FIG. 4 shows a cross-sectional view of the special-shaped cover plate and the flexible display panel attached with the bearing film after being attached;

[0028] FIG. 5 shows a structural schematic diagram of the bearing film in FIG. 4;

[0029] FIG. 6 shows a structural schematic diagram of the bearing film in an embodiment of the present disclosure;

[0030] FIG. 7 shows a cross-sectional comparison diagram of the bearing film passing through and not passing through the first through hole in FIG. 6;

[0031] FIG. 8 shows a cross-sectional view of a bearing film in another embodiment of the present disclosure;

[0032] FIG. 9 shows a cross-sectional view of a bearing film in another embodiment of the present disclosure;

[0033] FIG. 10 shows a structural schematic diagram of the bearing film in FIG. 6 and the flexible display panel after being attached;

[0034] FIG. 11 shows a structural schematic diagram of the flexible display panel and the special-shaped cover plate after being attached in FIG. 10;

[0035] FIG. 12 shows a schematic diagram of the optical adhesive being cured by ultraviolet light after the flexible display panel and the special-shaped cover plate are attached in FIG. 11;

[0036] Figure 13 shows a schematic diagram of the structure after the shaped cover plate is attached to the protective film in Figure 12;

[0037] Figure 14 shows a schematic diagram of the reduction of adhesion of the bearing film by ultraviolet light after the shaped cover plate is attached to the protective film in Figure 13;

[0038] Figure 15 shows a schematic diagram of the structure after the flexible display panel is attached to the back heat dissipation film in Figure 14.

[0039] Reference signs:

[0040] 100, bearing film; 110, bearing area; 120, handle area; 130, first interface area; 141, first through hole; 142, first groove; 143, first cavity; 150, circuit area; 160, second interface area; 200, flexible display panel; 210, back heat dissipation film; 300, flexible circuit board; 400, shaped cover plate; 410, cover plate protective film. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0042] In addition, the present disclosure can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0043] The present disclosure will be described below in combination with the drawings and with reference to specific embodiments:

[0044] In the related art, the bearing film 100 (Carrier Film, CF) is used for the attachment of the flexible display panel 200 (Panel, PNL) and the shaped cover plate 400 (Cover Glass, CG). During the attachment, most of the stress can be transferred to the bearing film 100, which can prevent the display panel from cracking and / or peeling due to excessive attachment pressure to a certain extent.

[0045] It should be noted that in some embodiments of the present disclosure, the special-shaped cover plate 400 refers to a cover plate structure different from a flat cover plate. The special-shaped cover plate 400 can have a certain curved portion, including but not limited to the special-shaped cover plate 400 shown in FIG. 1.

[0046] The present disclosure finds that, for the 3D cavity-shaped cover plate 400 as shown in FIGS. 1 and 2, after the flexible display panel 200 is attached to the shaped cover plate 400, the flexible display panel 200 and the flexible circuit board 300 (Flexible Printed Circuit, FPC) are not in a horizontal state, but as shown in FIG. 3, there is a certain angle between the flexible display panel 200 and the flexible circuit board 300, and in the process of transportation or human inspection, slight shaking or vibration will cause the bending area of the flexible display panel 200 and the flexible circuit board 300 to crack. In order to improve the cracking of the bending area of the display module, in the display module (Module, MDL) process, the bearing film 100 corresponding to the bending area (PAD) can be lengthened, as shown in FIG. 5, a circuit area 150 can be provided in the bearing film 100, and the circuit area 150 is attached to the flexible circuit board 300, so as to bear stress through the circuit area 150 of the bearing film 100, and reduce the stress suffered by the flexible display panel 200. At the same time, in the subsequent process, there is still a certain angle between the flexible display panel 200 and the flexible circuit board 300, and in the process of transportation or human inspection, there is still a risk of cracking or peeling caused by interference of the bending area. Therefore, the present disclosure prolongs the time of the bearing film 100 retained in the MDL process, so as to prolong the protection of the bearing film 100 to the bending area, which can reduce the cracking or peeling of the bending area caused by the stress of the flexible circuit board 300 to a certain extent. Since the optical adhesive for attaching the shaped cover plate and the flexible display panel 200 needs to be cured, ultraviolet light can be used to irradiate the shaped cover plate to cure the optical adhesive. However, since the wavelength of the ultraviolet light used for curing the optical adhesive is close to the wavelength of the ultraviolet light used for reducing the adhesion of the adhesive film layer of the bearing film 100, the ultraviolet light can easily penetrate the shaped cover plate and the display panel to act on the bearing film 100, which can cause the adhesive film layer of the bearing film 100 to reduce the adhesion, and the bearing film 100 has a risk of being pre-separated from the flexible display panel 200, which can generate a pulling force on the flexible display panel 200 away from the shaped cover plate. As shown in FIG. 4, since the handle area 120 of the bearing film 100 and the bearing area 110 / flexible display panel 200 have a certain angle, the pulling force at the connection between the handle area 120 and the bearing area 110 is larger, and the stress on the area corresponding to the connection between the handle area 120 and the bearing area 110 of the flexible display panel 200 is larger. After the bearing film 100 is removed, the area corresponding to the connection between the handle area 120 and the bearing area 110 of the flexible display panel 200 can have film printing and / or bulging defects.

[0047] Based on the above research ideas and inventive concepts of the present disclosure, in order to solve the problem that the bearing film 100 is easy to cause the flexible display panel 200 to appear the adverse phenomena of film printing and / or bulging, the present disclosure provides a bearing film 100, as shown in FIGS. 6-15, which is used for the attachment of the flexible display panel 200 and the special-shaped cover plate, and the bearing film 100 comprises a bearing area 110 and a handle area 120 connected with the bearing area 110, the bearing area 110 is used for attaching with the non-display side of the flexible display panel 200, and the first interface area between the handle area 120 and the bearing area 110 is provided with a first hollow part.

[0048] The bearing film 100 provided by the present disclosure sets the first hollow part at the first interface area between the handle area 120 and the bearing area 110, which can reduce the cross-sectional area of the first interface area, so as to reduce the elastic modulus of the first interface area; after the elastic modulus of the first interface area is reduced, the stress generated by the handle area 120 when it is bent on the first interface area can be reduced, and then the stress borne by the edge of the flexible display panel 200 can be reduced, so as to avoid the adverse phenomena of film printing and / or bulging of the flexible display panel 200 to a certain extent.

[0049] In some embodiments of the present disclosure, optionally, the bearing film 100 can comprise a flexible base layer, and the flexible base layer can be divided into the bearing area 110 and the handle area 120 according to the flexible display panel 200 used, so that the shape of the bearing area 110 corresponds to the shape of the flexible display panel 200, and the handle area 120 can be used for transferring and attaching the bearing area 110 and performing the attachment of the flexible display panel 200 and the special-shaped cover plate 400.

[0050] In some embodiments of the present disclosure, optionally, the preparation material of the flexible base layer can include but is not limited to flexible materials such as polyimide, polyethylene terephthalate, and polyethylene, so that the bearing film 100 has a certain flexibility, and the whole bearing film 100 can have the performance of a bendable area.

[0051] In some embodiments of the present disclosure, the bearing area 110 of the bearing film 100 is provided with a glue film layer, so that the bearing area 110 is attached to the non-display side of the flexible display panel 200 through the glue film layer. Optionally, the material of the glue film layer can be tack-reducing glue, and the tack-reducing glue is coated on the bearing area 110 to form the glue film layer. Optionally, the tack-reducing glue can be ultraviolet tack-reducing glue, so that the glue film layer is tack-reduced by ultraviolet light irradiation, so that when it is necessary to remove the bearing film 100 from the non-display side of the flexible display panel 200, the adhesion strength between the glue film layer and the flexible display panel 200 is reduced by ultraviolet light irradiation, so as to facilitate the removal of the bearing film 100 from the non-display side of the flexible display panel 200.

[0052] In some embodiments of the present disclosure, optionally, the carrier film 100 further comprises a protective layer on the side of the adhesive film layer away from the carrier. The protective layer can be covered on the surface of the adhesive film layer to prevent dust, water vapor and the like from entering the adhesive film layer, so as to ensure that the adhesive film layer has a preset bonding effect to adhere to the non-display side of the flexible display panel 200. When the carrier film 100 is adhered to the flexible display panel 200, the protective layer is removed from the adhesive film layer, so that the adhesive film layer is exposed to adhere to the non-display side of the flexible display panel 200.

[0053] As an optional implementation, as shown in FIGS. 6-10, the first hollow part includes any one or several of the first cavity 143, the first through hole 141, and the first groove 142.

[0054] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the first hollow part can adopt a thinning / attenuating mode such as the first cavity 143, the first through hole 141, and the first groove 142, to reduce the cross-sectional area of the first boundary area, and thus reduce the elastic modulus of the first boundary area. After the elastic modulus of the first boundary area is reduced, the stress generated on the first boundary area when the handle area 120 is bent can be reduced, and thus the stress borne by the edge of the flexible display panel 200 can be reduced, so that the flexible display panel 200 can be prevented from generating film printing and / or bulging to a certain extent.

[0055] In some embodiments of the present disclosure, as shown in FIGS. 6 and 7, the first boundary area can be provided with the first through hole 141, i.e., the first boundary area is perforated to remove part of the carrier film 100 in the first boundary area, so that the cross-sectional area of the first boundary area can be reduced, and thus the elastic modulus of the first boundary area can be reduced.

[0056] In some embodiments of the present disclosure, as shown in FIG. 8, the first boundary area can be provided with the first groove 142, i.e., the first boundary area is grooved to remove part of the carrier film 100 in the first boundary area, so that the cross-sectional area of the first boundary area can be reduced, and thus the elastic modulus of the first boundary area can be reduced. Optionally, the first groove 142 can be formed in the first boundary area by etching, or the structure of the first groove 142 can be reserved in the preparation process of the carrier film 100.

[0057] In some embodiments of the present disclosure, as shown in FIG. 9, the first boundary area can be provided with the first cavity 143, i.e., a cavity structure is formed in the first boundary area to remove part of the carrier film 100 in the first boundary area, so that the cross-sectional area of the first boundary area can be reduced, and thus the elastic modulus of the first boundary area can be reduced. Optionally, the first cavity 143 can reserve the structure of the first cavity 143 in the interior of the first boundary area 130 in the preparation process of the carrier film 100.

[0058] As an optional implementation, as shown in FIGS. 6-10, the first boundary region is provided with one or more first cavities 143, and / or one or more first through holes 141, and / or one or more first grooves 142; the plurality of first cavities 143 are arranged in the first boundary region at intervals along the extension direction of the first boundary region, and / or the plurality of first through holes 141 are arranged in the first boundary region at intervals along the extension direction of the first boundary region, and / or the plurality of first grooves 142 are arranged in the first boundary region at intervals along the extension direction of the first boundary region.

[0059] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the first boundary region corresponds to the connection position of the bearing region 110 and the handle region 120, and after the flexible display panel 200 is attached to the special-shaped cover plate 400 through the bearing film 100, the extension direction of the first boundary region corresponds to the bending path of the handle region 120 and the bearing region 110.

[0060] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the first boundary region is provided with at least one first cavity 143. Optionally, the first boundary region is provided with one first cavity 143, and the first cavity 143 is arranged in the first boundary region along the extension direction of the first boundary region. Optionally, the first boundary region is provided with a plurality of first cavities 143; the plurality of first cavities 143 are arranged in the first boundary region at intervals along the extension direction of the first boundary region, so that the distribution positions of the first cavities 143 correspond to the bending path of the handle region 120 and the bearing region 110, so as to reduce the cross-sectional area of the bending path of the handle region 120 and the bearing region 110, and further reduce the elastic modulus of the bending path of the handle region 120 and the bearing region 110, so that the handle region 120 is more easily bent relative to the bearing region 110, thereby reducing the force generated by the first boundary region connecting the handle region 120 and the bearing region 110 on the flexible display panel 200, and to a certain extent, avoiding the risk of film printing and / or bulging of the flexible display panel 200.

[0061] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the first boundary region is provided with at least one first through hole 141. Optionally, the first boundary region is provided with a plurality of first through holes 141, and the plurality of first through holes 141 are arranged in the first boundary region at intervals along the extension direction of the first boundary region, so that the distribution positions of the first through holes 141 correspond to the bending path of the handle region 120 and the bearing region 110, so as to reduce the cross-sectional area of the bending path of the handle region 120 and the bearing region 110, and further reduce the elastic modulus of the bending path of the handle region 120 and the bearing region 110, so that the handle region 120 is more easily bent relative to the bearing region 110, thereby reducing the force generated by the first boundary region connecting the handle region 120 and the bearing region 110 on the flexible display panel 200, and to a certain extent, avoiding the risk of film printing and / or bulging of the flexible display panel 200.

[0062] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the first boundary region is provided with at least one first groove 142. Optionally, the first boundary region is provided with one first groove 142, which is arranged along the extension direction of the first boundary region. Optionally, the first boundary region is provided with a plurality of first grooves 142, which are arranged in the first boundary region in a spaced manner along the extension direction of the first boundary region, so that the distribution positions of the first grooves 142 correspond to the bending path of the handle region 120 and the bearing region 110, thereby reducing the cross-sectional area of the bending path of the handle region 120 and the bearing region 110, and further reducing the elastic modulus of the bending path of the handle region 120 and the bearing region 110, so that the handle region 120 is more easily bent relative to the bearing region 110, thereby reducing the force generated by the first boundary region connecting the handle region 120 and the bearing region 110 on the flexible display panel 200, and to some extent, avoiding the risk of film printing and / or bulging of the flexible display panel 200.

[0063] As an optional implementation, as shown in FIGS. 6-10, the first cavity 143 and / or the first through hole 141 and / or the first groove 142 are in a strip shape, and the extension direction of the strip shape is the same as the extension direction of the first boundary region.

[0064] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the first through hole 141 is in a strip shape, and the extension direction of the strip shape is the same as the extension direction of the first boundary region, so that the extension direction of the first through hole 141 corresponds to the bending path of the handle region 120 and the bearing region 110, thereby reducing the cross-sectional area of the bending path of the handle region 120 and the bearing region 110, and further reducing the elastic modulus of the bending path of the handle region 120 and the bearing region 110. Similarly, the first cavity 143 and the first groove 142 can be in a strip shape, and the effect of the first cavity 143 and the first groove 142 being in a strip shape is the same as that of the first through hole 141, which will not be repeated here.

[0065] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the first through hole 141 in a strip shape is arranged in the first boundary region in a spaced manner along the extension direction of the first boundary region, so that a structure of an easy-to-tear line is formed in the first boundary region, the cross-sectional area of the first boundary region of the bearing film 100 is reduced, and further the elastic modulus of the first boundary region is reduced, thereby reducing the stress borne by the first boundary region, so that the handle region 120 of the bearing film 100 is more easily deformed and bent, thereby reducing the force generated by the first boundary region connecting the handle region 120 and the bearing region 110 on the flexible display panel 200, and to some extent, avoiding the risk of film printing and / or bulging of the flexible display panel 200.

[0066] As an optional implementation, as shown in FIGS. 8 and 9, the depth of the first cavity 143 in the thickness direction of the first interface region is (1:4) to (3:4) times the thickness of the first interface region; and / or, the depth of the first groove 142 in the thickness direction of the first interface region is (1:4) to (3:4) times the thickness of the first interface region.

[0067] In some embodiments of the present disclosure, by making the depth of the first cavity 143 in the thickness direction of the first interface region (1:4) to (3:4) times the thickness of the first interface region, the handle region 120 and the bearing region 110 can be kept connected at the first interface region, and the cross-sectional area of the first interface region 130 can be reduced, i.e., the cross-sectional area of the bending path of the handle region 120 and the bearing region 110 can be reduced, and the elastic modulus of the bending path of the handle region 120 and the bearing region 110 can be reduced. Optionally, the depth of the first cavity 143 in the thickness direction of the first interface region can be 1:4, 3:10, 2:5, 1:2, 3:5, 7:10, or 3:4 times the thickness of the first interface region.

[0068] In some embodiments of the present disclosure, by making the depth of the first groove 142 in the thickness direction of the first interface region (1:4) to (3:4) times the thickness of the first interface region, the handle region 120 and the bearing region 110 can be kept connected at the first interface region, and the cross-sectional area of the first interface region 130 can be reduced, i.e., the cross-sectional area of the bending path of the handle region 120 and the bearing region 110 can be reduced, and the elastic modulus of the bending path of the handle region 120 and the bearing region 110 can be reduced. Optionally, the depth of the first groove 142 in the thickness direction of the first interface region can be 1:4, 3:10, 2:5, 1:2, 3:5, 7:10, or 3:4 times the thickness of the first interface region.

[0069] As an optional implementation, the thickness of the handle region 120 is (1:4) to (3:4) times the thickness of the bearing region 110.

[0070] In some embodiments of the present disclosure, by making the thickness of the handle region 120 (1:4) to (3:4) times the thickness of the bearing region 110, i.e., by thinning the handle region 120 as a whole, the cross-sectional area of the first interface region 130 can be reduced, i.e., the cross-sectional area of the bending path of the handle region 120 and the bearing region 110 can be reduced, and the elastic modulus of the bending path of the handle region 120 and the bearing region 110 can be reduced. Optionally, the thickness of the handle region 120 can be 1:4, 3:10, 2:5, 1:2, 3:5, 7:10, or 3:4 times the thickness of the bearing region 110.

[0071] As an optional embodiment, as shown in FIGS. 6-10, the flexible display panel 200 is connected with the flexible circuit board 300, and the carrier film 100 further comprises a circuit area 150 connected with the carrier area 110, and the circuit area 150 is used to be attached with the flexible circuit board 300.

[0072] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the flexible display panel 200 is connected with the flexible circuit board, and after the display module is provided with the back heat dissipation film 210, the flexible circuit board 300 can be bent to the non-display side of the flexible display panel 200 through a bending process. Before the display module is provided with the back heat dissipation film 210, the flexible circuit board is connected on the flexible display panel 200, and after the flexible display panel 200 is attached with the special-shaped cover plate 400, there is a certain angle between the flexible circuit board and the flexible display panel 200. By attaching the circuit area 150 on the flexible circuit board 300, the stress between the flexible circuit board and the flexible display panel 200 can be borne by the circuit area 150 of the carrier film 100, so as to reduce the stress borne by the flexible display panel 200.

[0073] As an optional embodiment, as shown in FIGS. 6-10, the second interface area 160 connected with the carrier area 110 of the circuit area 150 is provided with a second hollow part, and the second hollow part comprises any one or several of a second cavity, a second through hole and a second groove.

[0074] In some embodiments of the present disclosure, as shown in FIGS. 6-10, the second interface area 160 connected with the carrier area 110 of the circuit area 150 is provided with a second hollow part, and the cross-sectional area of the second interface area 160 can be reduced through the second hollow part, so as to reduce the elastic modulus of the second interface area 160. After the elastic modulus of the second interface area 160 is reduced, the stress generated on the second interface area when the circuit area 150 is bent can be reduced, and then the stress borne by the edge of the flexible display panel 200 is reduced, so that the film printing and / or bulging defects of the flexible display panel 200 can be avoided to a certain extent. In some embodiments of the present disclosure, the second hollow part comprises any one or several of a second cavity, a second through hole and a second groove. The second hollow part can be thinned / attenuated in the form of a second cavity, a second through hole and a second groove, so as to reduce the cross-sectional area of the second interface area 160, and then reduce the elastic modulus of the second interface area 160. The second cavity, the second through hole and the second groove have the same effect and principle as the first cavity 143, the first through hole 141 and the first groove 142 of the first interface area in reducing the cross-sectional area of the second interface area 160, and details are not repeated here.

[0075] Based on the same inventive concept, the display module provided by the embodiments of the present disclosure also includes the flexible display panel 200 and the carrier film 100 described above, and the carrier area 110 in the carrier film 100 is attached to the non-display side of the flexible display panel 200.

[0076] The display module provided by the present disclosure includes the carrier film 100 of the technical solution described above, and therefore has all the beneficial effects of the carrier film 100 described above, which will not be repeated here.

[0077]

[0078] In some embodiments of the present disclosure, the flexible display panel 200 can be an organic light-emitting diode display (OLED) or an active-matrix organic light-emitting diode display (AMOLED).

[0079] In some embodiments of the present disclosure, the display module can be used in wearable display, vehicle-mounted display, and other display devices.

[0080] As an optional implementation, the display module further includes a special-shaped cover plate 400, which is attached to the display side of the flexible display panel 200.

[0081] In some embodiments of the present disclosure, as shown in FIGS. 1 and 2 and FIGS. 10 to 15, the special-shaped cover plate 400 can have different structures according to the design purpose of the display module, and have a certain 3D cavity for attachment with the flexible display panel 200.

[0082] Based on the same inventive concept, the embodiments of the present disclosure also provide a preparation method of the display module described above, which includes the following steps:

[0083] The carrier film 100 attachment step provides the carrier film 100 and the flexible display panel 200, and attaches the carrier area 110 in the carrier film 100 to the non-display side of the flexible display panel 200;

[0084] The special-shaped cover plate attachment step provides a special-shaped cover plate, and attaches the display side of the flexible display panel 200 to the special-shaped cover plate through the carrier film 100;

[0085] The carrier film 100 removal step removes the carrier film 100 from the non-display side of the flexible display panel 200; and,

[0086] The heat dissipation film attachment step provides a back heat dissipation film 210, and attaches the back heat dissipation film 210 to the non-display side of the flexible display panel 200.

[0087] In some embodiments of the present application, as shown in FIG. 10, in the step of adhering the carrier film 100, the carrier area 110 in the carrier film 100 can be adhered to the non-display side of the flexible display panel 200 by a vacuum attachment process. Optionally, the circuit area 150 is adhered to the corresponding area of the flexible circuit board 300. In the subsequent irregular cover plate adhering process, by adhering the carrier film 100 to the non-display side of the flexible display panel 200, the carrier film 100 can withstand the pressure generated by the adhering process, and can protect the flexible display panel 200 from the risk of cracking or peeling caused by excessive adhering pressure.

[0088] In some embodiments of the present application, as shown in FIG. 11, after the step of adhering the carrier film 100, the irregular cover plate adhering step can be performed, and the display side of the flexible display panel 200 is adhered to the irregular cover plate through the carrier film 100; at the same time, an optical adhesive (OCA) is provided on the side of the irregular cover plate adjacent to the flexible display panel 200, as shown in FIG. 12, and ultraviolet light (UV) is used to irradiate from the side of the irregular cover plate to cure the optical adhesive, and then the irregular cover plate and the flexible display panel 200 are adhered together through the optical adhesive. At this time, the carrier film 100 remains on the non-display side of the flexible display panel 200, and provides a protective effect for the flexible display panel 200 and the flexible circuit board 300.

[0089] In some embodiments of the present application, as shown in FIG. 13, optionally, after the irregular cover plate adhering step, an irregular cover plate protective film 410 can be adhered to the side of the irregular cover plate 400 away from the flexible display module, so as to protect the irregular cover plate from being scratched in subsequent processes.

[0090] In some embodiments of the present application, as shown in FIG. 14, optionally, the adhesive film layer on the carrier film 100 is irradiated by ultraviolet light (UV) from the side of the carrier film 100 to reduce the viscosity of the adhesive film layer, so as to facilitate the removal of the carrier film 100 from the non-display side of the flexible display panel 200.

[0091] In some embodiments of the present application, as shown in FIG. 15, after the carrier film 100 is removed, the back heat dissipation film 210 is adhered to the non-display side of the flexible display panel 200, so as to provide a heat dissipation and protection effect for the flexible display panel 200 through the back heat dissipation film 210. Optionally, the back heat dissipation film 210 includes an adhesive layer, a buffer layer and a heat dissipation layer which are sequentially stacked, and the adhesive layer is pasted to the non-display side of the flexible display panel 200 so that the heat dissipation film is arranged on the non-display side of the flexible display panel 200.

[0092]

[0093] As an optional implementation, the bearing area 110 of the bearing film 100 is kept adhered to the non-display side of the flexible display panel 200 before the back heat dissipation film 210 is adhered to the non-display side of the flexible display panel 200.

[0094] In some embodiments of the present disclosure, the bearing area 110 of the bearing film 100 is kept adhered to the non-display side of the flexible display panel 200 before the heat dissipation film adhering step, i.e. before the back heat dissipation film 210 is adhered to the non-display side of the flexible display panel 200, which can prolong the protection of the flexible display panel 200 by the bearing film 100 and provide protection to the flexible display panel 200 in multiple processes. Compared with the solution of removing the bearing film 100 immediately after the special-shaped cover plate adhering step, the embodiments of the present disclosure can provide protection to the flexible display panel 200 in multiple processes by prolonging the process period of the bearing film 100 in the display module, and avoid the flexible display panel 200 from being broken or peeled off in these processes.

[0095] In the present disclosure, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature, which includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature, which includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0096] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0097] In addition, in the present disclosure, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features indicated, or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0098] In addition, the technical solutions among various embodiments can be combined with each other, but it must be based on that a person skilled in the art can realize, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present disclosure.

[0099] Although the embodiments of the present disclosure have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A carrier film for bonding a flexible display panel and a special-shaped cover plate, the carrier film comprising a carrier region and a handle region connected with the carrier region, the carrier region being used for bonding with a non-display side of the flexible display panel, and the handle region being provided with a first hollow part at a first interface region where the carrier region and the handle region are connected with each other.

2. The carrier film of claim 1, wherein, The first hollow part comprises any one or more of a first cavity, a first through hole, and a first groove.

3. The carrier film of claim 2, wherein, The first interface region is provided with one or more of the first cavities, and / or one or more of the first through holes, and / or one or more of the first grooves; a plurality of the first cavities are arranged in the first interface region at intervals along an extension direction of the first interface region, and / or a plurality of the first through holes are arranged in the first interface region at intervals along the extension direction of the first interface region, and / or a plurality of the first grooves are arranged in the first interface region at intervals along the extension direction of the first interface region.

4. The carrier film of claim 3, wherein, The first cavity and / or the first through hole and / or the first groove are in a strip shape, and the extension direction of the strip shape is the same as the extension direction of the first interface region.

5. The carrier film of claim 2, wherein, A depth of the first cavity in a thickness direction of the first interface region is (1:4) to (3:4) of a thickness of the first interface region; and / or a depth of the first groove in the thickness direction of the first interface region is (1:4) to (3:4) of the thickness of the first interface region.

6. The carrier film of claim 1, wherein, A thickness of the handle region is (1:4) to (3:4) of a thickness of the carrier region.

7. The carrier film of any one of claims 1 to 6, wherein, The flexible display panel is further connected with a flexible circuit board, and the carrier film further comprises a circuit region connected with the carrier region, the circuit region being used for bonding with the flexible circuit board.

8. The carrier film of claim 7, wherein, A second interface region where the circuit region and the carrier region are connected with each other is provided with a second hollow part, the second hollow part comprising any one or more of a second cavity, a second through hole, and a second groove. 9.A display module comprising a flexible display panel and the carrier film according to any one of claims 1 to 8, the carrier region in the carrier film being bonded to the non-display side of the flexible display panel.

10. The display module of claim 9, wherein, The display module further comprises a special-shaped cover plate, the special-shaped cover plate being bonded to a display side of the flexible display panel. 11.A method for manufacturing the display module according to claim 8 or 9, the method comprising the following steps: a carrier film bonding step of providing a carrier film and a flexible display panel, and bonding a carrier region in the carrier film to a non-display side of the flexible display panel; a special-shaped cover plate bonding step of providing a special-shaped cover plate, and bonding a display side of the flexible display panel to the special-shaped cover plate through the carrier film; a carrier film removing step of removing the carrier film from the non-display side of the flexible display panel; and a back heat dissipation film bonding step of providing a back heat dissipation film, and bonding the back heat dissipation film to the non-display side of the flexible display panel.

12. The method for manufacturing a display module as described in claim 11, wherein, The carrier region remains bonded to the non-display side of the flexible display panel before the back heat dissipation film is bonded to the non-display side of the flexible display panel.

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