Stretchable display panel and method of manufacturing the same

Abstract

The application provides a stretchable display panel and a preparation method thereof. The stretchable display panel comprises: a plurality of island structures, the plurality of island structures are arranged at intervals; a plurality of bridge structures, each bridge structure connects two adjacent island structures; and a functional film, which is arranged on the plurality of island structures. Each island structure comprises: a substrate unit, a driving circuit group, a pixel unit and a support column group, the driving circuit group is electrically connected to the pixel unit, the support column group is located at the periphery of the pixel unit and is in contact with the functional film. The application makes the support column group in the island structure in contact with the functional film, so that the functional film and the support column group have an interaction force, thereby limiting the shape of the island structure and inhibiting the deformation of the island structure when the stretchable display panel is in a stretched state, so that the display viewing angle of the pixel unit is relatively fixed, and the display effect of the display panel is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a stretchable display panel and a preparation method thereof. BACKGROUND

[0002] Stretchable display is an important upgrade of flexible display after folding, which has the properties of deformability in any direction and stretchability recovery, and has wide application prospects.

[0003] In the existing stretchable display panel, in order to facilitate the stretching strain, the substrate is dispersed in island shape, forming island structures arranged at intervals, and the island structures are connected through the belt-shaped bridge structure. The pixel driving circuit and the pixel unit are arranged in the island structure, and the signal lines between the pixel driving circuits are arranged in the belt-shaped bridge structure, and the stretchability of the display panel is realized through the distortion of the bridge structure.

[0004] However, due to the defects in the structure design, the distortion of the bridge structure in the existing stretchable display panel will further cause the distortion of the island structure, thereby affecting the display viewing angle of the pixel unit arranged in the island structure, and the display effect is poor. This problem needs to be solved urgently. SUMMARY

[0005] The present application provides a stretchable display panel and a preparation method thereof, which can effectively solve the problem of display viewing angle change of the pixel unit caused by the distortion of the bridge structure driving the distortion of the island structure.

[0006] The present application provides a stretchable display panel, which comprises:

[0007] a plurality of island structures, the plurality of island structures are arranged at intervals;

[0008] a plurality of bridge structures, each bridge structure connects two adjacent island structures; and

[0009] a functional film, which is arranged on the plurality of island structures and the bridge structures;

[0010] Each island structure comprises a substrate unit, a driving circuit group, a pixel unit and a support column group arranged on the substrate unit, the driving circuit group is electrically connected with the pixel unit, the support column group is located at the periphery of the pixel unit and is in contact with the functional film.

[0011] Optionally, the support column group is fixedly connected with the functional film.

[0012] Optionally, each of the support column groups comprises a plurality of support columns arranged at intervals.

[0013] Optionally, the substrate unit is in a rectangular shape, and each of the support column groups comprises four support columns corresponding to four corners of the substrate unit.

[0014] Optionally, the support column is made of photoresist.

[0015] Optionally, the functional film comprises a first functional part and a second functional part, the first functional part is arranged corresponding to the plurality of island structures, the second functional part is arranged corresponding to the bridge structure, and the elastic modulus of the first functional part is greater than that of the second functional part.

[0016] Optionally, the functional film is made of polydimethylsiloxane.

[0017] Optionally, the bridge structure comprises a signal line, the signal line connects two adjacent driving circuit groups, and the length of the signal line is greater than the distance between the two driving circuit groups.

[0018] Optionally, the stretchable display panel further comprises a bonding structure, the bonding structure is arranged on the edge of the side of the functional film close to the island structure, and the functional film is fixedly connected with the substrate unit through the bonding structure.

[0019] Correspondingly, the application also provides a preparation method of a display device, and comprises the following steps:

[0020] forming a substrate substrate on a glass substrate;

[0021] manufacturing a driving circuit layer and a support column group on the substrate substrate, and patterning the substrate substrate and the driving circuit layer to form substrate units arranged at intervals, driving circuit groups on each substrate unit, and bridge structures between adjacent driving circuit groups;

[0022] forming pixel units corresponding to each driving circuit group, wherein the support column group is located at the periphery of the pixel unit, each substrate unit, the driving circuit group, the pixel unit, and the support column group arranged on the substrate unit form an island structure;

[0023] peeling the island structure and the bridge structure from the glass substrate;

[0024] providing a functional film, the functional film comprising a first functional part and a second functional part, and performing ultraviolet modification treatment on the first functional part;

[0025] The functional film is entirely covered on the island structure and the bridge structure, and the functional film is contacted with the support column group, wherein the first functional part is arranged corresponding to the island structure, and the bridge structure is arranged corresponding to the second functional part.

[0026] The application provides a stretchable display panel and a manufacturing method thereof, and the interaction force between the functional film and the support column group is formed by contacting the support column group in the island structure with the functional film, so as to limit the morphology of the island structure and inhibit the deformation of the island structure when the stretchable display panel is in a stretching state, thereby relatively fixing the display visual angle of the pixel unit and improving the display effect of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a cross-sectional schematic view of the stretchable display panel provided by the embodiments of the present application;

[0029] Figure 2 is a top view of the island structure and the bridge structure provided by the embodiments of the present application;

[0030] Figure 3 is a cross-sectional schematic view of the stretchable display panel provided by the embodiments of the present application along the AA' line; Figure 2

[0031] Figure 4 is a manufacturing flowchart of the stretchable display panel provided by the embodiments of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device. ​

[0033] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the elements of the particular examples are described in the following disclosure. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application can repeatedly refer to reference numerals and / or reference 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 arrangements being discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials. The following are described in detail, respectively, and it should be noted that the order of the following embodiment descriptions does not limit the preferred order of the embodiments.

[0034] Embodiments of the present application provide a stretchable display panel, which can be an organic light-emitting diode (OLED) display panel, a mini light-emitting diode (Micro LED) display panel, or a micro light-emitting diode (Micro LED) display panel.

[0035] In the embodiments, the stretchable display panel has a first state and a second state. When the stretchable display panel is in the first state, the stretchable display panel is not stretched, at this time, the stretchable display panel does not deform (deformation includes twisting or elongation, etc.), and the stretchable display panel in the first state has a planar form. When the stretchable display panel is in the second state, the stretchable display panel is stretched, at this time, the stretchable display panel deforms, the stretchable display panel is in a stretched state, and the stretchable display panel in the second state has a curved form or a planar form.

[0036] Figure 1 is a cross-sectional schematic view of the stretchable display panel provided by the embodiments of the present application; Figure 2 is a top view of an island structure and a bridge structure provided by the embodiments of the present application; Figure 3 is a cross-sectional schematic view of the stretchable display panel provided by the embodiments of the present application along the AA' line; Figure 2 is a cross-sectional schematic view of the stretchable display panel provided by the embodiments of the present application along the AA' line; Figures 1-3As shown, the stretchable display panel comprises a plurality of island structures 10, the plurality of island structures 10 are arranged in a matrix and are spaced apart from each other, wherein each island structure 10 comprises a substrate unit 100, a driving circuit group 110 and a pixel unit 120. Specifically, the substrate unit 100 is used to carry the driving circuit group 110 and the pixel unit 120, and the material thereof can be a flexible material with flexible bending performance, such as polyimide (PI); the driving circuit group 110 is electrically connected with the pixel unit 120, and the driving circuit group 110 is used to drive the pixel unit 120 to emit light; the pixel unit 120 is used to perform display function and comprises at least one sub-pixel unit.

[0037] In this embodiment, the stretchable display panel further comprises a plurality of bridge structures 20, each bridge structure 20 connects two adjacent island structures 10 and can be twisted or stretched when the stretchable display panel is in the second state. Specifically, the bridge structure 20 comprises a signal line, the signal line is used to connect two adjacent driving circuit groups 110, and the length of the signal line is greater than the spacing between the two driving circuit groups 110. When the stretchable display panel is in the first state, the signal line has a bending state; when the stretchable display panel is switched from the first state to the second state, the signal line can be twisted or elongated, and gradually approaches a straight state from the bending state as the deformation degree of the stretchable display panel increases. Preferably, the signal line is a meandering line.

[0038] In this embodiment, the display panel further comprises a functional film 30, the functional film 30 is arranged on the plurality of island structures 10 and the plurality of bridge structures 20. Correspondingly, the island structure 10 further comprises a support column group 130, the support column group 130 is fixedly arranged on the driving circuit group 110 and located at the periphery of the pixel unit 120, and the support column group 130 is in contact with the functional film 30. Since the support column group 130 is in contact with the functional film 30, a certain interaction force is generated between the support column group 130 and the functional film 30, so that when the stretchable display panel is switched from the first state to the second state, the functional film 30 can limit the deformation of the island structure 10 through the support column group 130 in contact therewith, so that each island structure 10 is more stably limited on the same plane, preventing the island structure 10 from deforming, that is, when the stretchable display panel is in the second state, each island structure 10 will not be affected by the twisting deformation of the bridge structure 20 due to the interaction force between the support column group 130 and the functional film 30, thereby avoiding the problem of display viewing angle change of the stretchable display panel and improving the display effect of the stretchable display panel in the second state.

[0039] In the embodiment, one case of the contact between the support column group 130 and the functional film 30 is that the support column group 130 is in abutment with the functional film 30. When the stretchable display panel is switched from the first state to the second state, the static sliding friction between the support column group 130 and the functional film 30 can inhibit the deformation of each island structure 10 and limit the deformation of each island structure 10 on the same plane, thereby improving the viewing angle change problem of the stretchable display panel in the second state and improving the display effect.

[0040] In the embodiment, another case of the contact between the support column group 130 and the functional film 30 is that the support column group 130 is fixedly connected with the functional film 30, so as to further enhance the interaction force between the support column group 130 and the functional film 30 and stably limit each island structure 10 on the same plane to prevent the deformation of the island structure 10. There are various ways to realize the fixed connection between the support column group 130 and the functional film 30. The present application introduces three kinds of them, wherein the first kind is that the part of the functional film 30 in contact with the support column group 130 is provided with a colloid, and the fixed action of the colloid is used to fixedly connect the functional film 30 with the support column group 130; the second kind is that the functional film 30 is provided with a groove, at least part of the support column group 130 is embedded in the groove and abuts against each inner wall of the groove, so as to form a clamping structure and realize the fixed connection between the functional film 30 and the support column group 130; the third kind is that the functional film 30 is provided with a protrusion, and the support column group 130 is correspondingly provided with a groove, the protrusion is embedded in the groove, so as to form a clamping structure and realize the fixed connection between the functional film 30 and the support column group 130.

[0041] In the embodiment, the support column group 130 includes a plurality of support columns 131 arranged at intervals. Further, the number of support columns 131 in each support column group 130 is not less than 4, so as to ensure the support strength of the support column group 130 to the functional film 30 and make the combined structure of the support column group 130 and the functional film 30 better limit the island structure 10, inhibit the deformation of the island structure 10, improve the viewing angle change problem of the stretchable display panel in the second state, and improve the display effect.

[0042] In the embodiment, the shape of the substrate unit 100 can be rectangular, and the support column group 130 includes four support columns 131 corresponding to the four corner portions of the substrate unit 100. Of course, the shape of the substrate unit 100 is not limited in the present application, and in other embodiments of the present application, the shape of the substrate unit 100 can be circular, triangular or other polygonal.

[0043] In this embodiment, the support column 131 has a certain rigidity, so that it can not be deformed under certain pressure conditions. Specifically, the support column 131 can be a column formed of photoresist material.

[0044] In this embodiment, the functional film 30 includes a first functional part 31 and a second functional part 32, the first functional part 31 is provided corresponding to the plurality of island structures 10, the second functional part 32 is provided corresponding to the bridge structure 20, and the elastic modulus of the first functional part 31 is greater than that of the second functional part 32. The elastic modulus, also known as Young's modulus, is the most important and most characteristic mechanical property of elastic materials, and is a representation of the difficulty of elastic deformation of an object. The greater the elastic modulus, the greater the stress required to cause a certain elastic deformation of the elastic material, that is, the more difficult it is for the elastic material to deform. Correspondingly, the smaller the elastic modulus, the smaller the stress required to cause a certain elastic deformation of the elastic material, that is, the easier it is for the elastic material to deform. Since the elastic modulus of the first functional part 31 is greater, the first functional part 31 is more difficult to deform, so that it can better inhibit the deformation of the island structure 10 under the support of the support column group 130, improve the viewing angle change problem of the stretchable display panel in the second state, and improve the display effect. Since the elastic modulus of the second functional part 32 is smaller, the second functional part 32 is more likely to deform, so that the arrangement of the second functional part 32 does not affect the normal stretching of the bridge structure 20, to ensure the stretching performance of the stretchable display panel in the second state.

[0045] In this embodiment, the material of the functional film 30 includes polydimethylsiloxane (PDMS), and the functional film 30 can change the elastic modulus of part of the functional film 30 by ultraviolet modification. Specifically, the part of the functional film 30 corresponding to the island structure 10 can be processed by heat curing and ultraviolet irradiation to cause redox and cleavage reaction of the polydimethylsiloxane in the functional film 30, so as to increase the elastic modulus of the part of the functional film 30 corresponding to the island structure 10, and form the first functional part 31. The part of the functional film 30 not subjected to ultraviolet modification corresponds to form the second functional part 32 of the functional film 30.

[0046] In this embodiment, the elastic modulus of the substrate unit 100 is greater than the elastic modulus of the first functional part 31, that is, the substrate unit 100 is more difficult to deform than the functional film 30. The reason is that the substrate unit 100 serves as the carrier of the driving circuit group 110 and the pixel unit 120, and when it has a greater elastic modulus, it can be beneficial to the stability of the form of the driving circuit group 110 and the pixel unit 120, further enhancing the stability of the island structure 10 of the stretchable display panel in the second state, and improving the display quality.

[0047] In this embodiment, the island structure 10 and the bridge structure 20 in the stretchable display panel are both formed by patterning the driving circuit layer. The driving circuit layer forms the driving circuit group 110 in the area corresponding to the island structure 10, and forms the signal wire and other film layers covering the signal wire in the area corresponding to the bridge structure 20. Each driving circuit group 110 includes a plurality of thin film transistors, and the type of thin film transistor can be at least one of amorphous silicon thin film transistor, low-temperature polysilicon thin film transistor and metal oxide semiconductor thin film transistor.

[0048] In this embodiment, the pixel unit 120 includes at least one sub-pixel unit. Preferably, the pixel unit 120 includes a plurality of sub-pixel units, and the plurality of sub-pixel units have different light-emitting colors, and the size of each sub-pixel light-emitting unit can be the same or different. Specifically, the plurality of sub-pixel units in each pixel unit 120 can include at least one first sub-pixel unit 121 having a first light-emitting color, at least one second sub-pixel unit 122 having a second light-emitting color, and at least one third sub-pixel unit 123 having a third light-emitting color. As an example, the first light-emitting color is red, the second light-emitting color is green, and the third light-emitting color is blue.

[0049] In this embodiment, the stretchable display panel further includes an encapsulation structure 50 disposed on the pixel unit 120, which is used to protect the pixel unit 120 and avoid functional abnormalities caused by external water and oxygen invasion.

[0050] In the embodiment, the stretchable display panel further comprises a bonding structure 40 for fixing the functional film 30 on the plurality of island structures 10. As an example of the present application, the bonding structure 40 can be arranged on the edge of the side of the functional film 30 close to the island structure 10, so that the functional film 30 is fixedly connected with the substrate unit 100 through the bonding structure 40, so that the contact between the functional film 30 and the support column 131 is more closely, so that the island structure 10 in the second state of the stretchable display panel is better maintained, and the display effect is improved. Of course, the present application does not limit the arrangement mode of the bonding structure 40, and in other embodiments of the present application, the bonding structure 40 can not only be arranged on the edge of the side of the functional film 30 close to the island structure 10, but also can be arranged between adjacent island structures 10, so that the contact between the functional film 30 on each island structure 10 and the support column 131 is more closely.

[0051] Figure 4 is a manufacturing flowchart of the stretchable display panel provided by the embodiment of the present application, in combination with Figures 1-4 The present application further provides a preparation method of a stretchable display panel, which specifically comprises the following steps:

[0052] Step S1, forming a substrate substrate on a glass substrate.

[0053] Specifically, the step S1 comprises: providing a glass substrate, coating a polyimide solution on the glass substrate, and drying treatment, so as to form the substrate substrate with polyimide material on the glass substrate.

[0054] Step S2, making a driving circuit layer and a support column group on the substrate substrate, and patterning the substrate substrate and the driving circuit layer to form a substrate unit arranged at intervals, a driving circuit group located on each substrate unit, and a bridge structure located between adjacent driving circuit groups.

[0055] Specifically, in the step S2, the support column group 130 can be prepared by coating a photoresist layer with a certain thickness on the driving circuit layer after the driving circuit layer is prepared, and patterning the photoresist layer, the support column group 130 is arranged in one-to-one correspondence with the driving circuit group 110, each of the support column group 130 includes a plurality of support columns 131 arranged at intervals; the patterning manner of the substrate and the driving circuit layer includes at least one of laser cutting (Laser Cut) and etching; the driving circuit group 110 is arranged in one-to-one correspondence with the substrate unit 100, each of the driving circuit group 110 includes a plurality of thin film transistors; each of the bridge structures 20 includes a signal trace connecting adjacent driving circuit groups 110.

[0056] Step S3, corresponding pixel units are formed on each of the driving circuit groups, wherein the support column group is located at the periphery of the pixel unit, and each of the substrate unit, the driving circuit group arranged on the substrate unit, the pixel unit, and the support column group form an island structure.

[0057] Specifically, the step S3 further includes: forming an encapsulation structure 50 on the pixel unit 120, wherein the support column group 130 is located at the periphery of the encapsulation structure 50. In addition, in the step S3, the driving circuit group 110 is used to drive the pixel unit 120 to emit light, each of the pixel units 120 includes at least one sub-pixel unit, when each of the pixel units 120 includes a plurality of sub-pixel units, the driving circuit group 110 electrically connected with the pixel unit 120 can include a plurality of pixel driving circuits, and each pixel driving circuit is electrically connected with one of the sub-pixel units. The type of the pixel unit 120 can be any one of an OLED pixel unit, a Micro LED pixel unit, and a Mini LED pixel unit, when the pixel unit 120 is an OLED pixel unit, the process of forming the OLED pixel unit can be an evaporation process or a printing process; when the pixel unit 120 is a Micro LED pixel unit or a Mini LED pixel unit, the process of forming the Micro LED pixel unit or the Mini LED pixel unit can include a transfer (Transfer) and a bonding (Bonding) process.

[0058] Step S4, the island structure and the bridge structure are peeled off from the glass substrate.

[0059] Specifically, in the step S4, the island structure 10 and the bridge structure 20 can be peeled off from the surface of the glass substrate by a laser lift-off (Laser Lift Off, LLO) process.

[0060] Step S5, providing a functional film, the functional film comprising a first functional part and a second functional part, the first functional part being subjected to ultraviolet modification treatment.

[0061] Specifically, the functional film 30 comprises polydimethylsiloxane, after the ultraviolet modification, the elastic modulus of the first functional part 31 in the functional film 30 is increased, and the deformation resistance is enhanced; the ultraviolet modification can be specifically achieved by heat curing and ultraviolet irradiation, so that the polydimethylsiloxane in the first functional part 31 undergoes oxidation-reduction and cracking reaction, so as to increase the elastic modulus of the functional film 30 in the first region.

[0062] Step S6, covering the functional film on the island structure and the bridge structure, and making the functional film contact with the support column group, wherein the first functional part is arranged corresponding to the island structure, and the bridge structure is arranged corresponding to the second functional part.

[0063] It should be noted that in the preparation method of the stretchable display panel provided in the present application, the order of some steps in steps S1-S6 is not fixed and can be changed, for example, in other embodiments of the present application, the order of steps S5 and S6 can be changed, that is, the functional film 30 can be covered on the island structure 10 and the bridge structure 20 first, and then the first functional part 31 in the functional film 30 is subjected to ultraviolet modification treatment.

[0064] Further, the preparation method of the stretchable display panel provided in the present application further comprises step S7, a bonding structure 40 is arranged on the edge of the side of the functional film 30 close to the island structure 10, and the functional film 30 is fixedly connected with the substrate unit 100 through the bonding structure 40.

[0065] In summary, the present application provides a stretchable display panel and a preparation method thereof, the stretchable display panel comprising: a plurality of island structures, the plurality of island structures being arranged at intervals; a plurality of bridge structures, each bridge structure connecting two adjacent island structures; a functional film, the functional film being arranged on the plurality of island structures; wherein each island structure comprises: a substrate unit, a driving circuit group, a pixel unit and a support column group arranged on the substrate unit, the driving circuit group being electrically connected with the pixel unit, and the support column group being located at the periphery of the pixel unit and being in contact with the functional film. The present application makes the functional film and the support column group have interaction force by making the support column group in the island structure contact with the functional film, so as to fix the shape of the island structure and inhibit the deformation of the island structure when the stretchable display panel is in a stretched state, thereby relatively fixing the display viewing angle of the pixel unit and improving the display effect of the display panel.

[0066] The above describes in detail the stretchable display panel and the manufacturing method thereof provided by the embodiments of the present application. The principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and the core idea thereof. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A stretchable display panel, characterized by, The stretchable display panel comprises: a plurality of island structures, the plurality of island structures being arranged at intervals; a plurality of bridge structures, each of the bridge structures connecting two adjacent island structures; and a functional film, the functional film being arranged on the plurality of island structures and the bridge structures, the functional film comprising a first functional part and a second functional part, the first functional part being arranged corresponding to the plurality of island structures, the second functional part being arranged corresponding to the bridge structures, and the elastic modulus of the first functional part being greater than the elastic modulus of the second functional part. Each of the island structures comprises: a substrate unit, a driving circuit group arranged on the substrate unit, a pixel unit, and a support column group, the elastic modulus of the substrate unit being greater than the elastic modulus of the first functional part, and the substrate units in different island structures being arranged at intervals; the driving circuit group is electrically connected to the pixel unit, the support column group is located at the periphery of the pixel unit, the support column group is fixedly connected to the functional film, each of the support column groups comprises a plurality of support columns arranged at intervals, the support columns in the support column group are made of rigid material and are in contact with the first functional part in the functional film; the shape of the substrate unit is rectangular, and the support column group comprises four support columns corresponding to four corners of the corresponding substrate unit.

2. The stretchable display panel of claim 1, wherein, The material of the support column is photoresist.

3. The stretchable display panel of claim 1, wherein, The material of the functional film is polydimethylsiloxane.

4. The stretchable display panel of claim 1, wherein, The bridge structure comprises a signal line, the signal line connecting two adjacent driving circuit groups; the length of the signal line is greater than the distance between the two driving circuit groups.

5. The stretchable display panel of claim 1, wherein, The stretchable display panel further comprises a bonding structure, the bonding structure being arranged on the edge of the side of the functional film close to the island structure, and the functional film being fixedly connected to the substrate unit through the bonding structure.

6. A method of manufacturing a stretchable display panel, characterized by, The method comprises the following steps: forming a substrate substrate on a glass substrate; forming a driving circuit layer and a support column group on the substrate substrate, and patterning the substrate substrate and the driving circuit layer to form substrate units arranged at intervals, driving circuit groups located on the substrate units, and bridge structures located between adjacent driving circuit groups; forming pixel units corresponding to each driving circuit group, wherein the support column group is located at the periphery of the pixel unit, the support column group is fixedly connected to the functional film, each support column group comprises a plurality of support columns arranged at intervals, each substrate unit and the driving circuit group, pixel unit and support column group arranged on the substrate unit form an island structure; peeling the island structure and the bridge structure from the glass substrate; providing a functional film, the functional film comprising a first functional part and a second functional part, and the first functional part being subjected to ultraviolet modification treatment, wherein the elastic modulus of the substrate unit is greater than the elastic modulus of the first functional part. The functional film is entirely covered on the island structure and the bridge structure, and the first functional part in the functional film is in contact with the support column in the support column group, wherein the support column is a rigid material, the first functional part is arranged corresponding to the island structure, the bridge structure is arranged corresponding to the second functional part, and the elastic modulus of the first functional part is greater than the elastic modulus of the second functional part; the shape of the substrate unit is rectangular, and the support column group comprises four support columns corresponding to four corner portions of the corresponding substrate unit respectively.

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