A display panel and a method for manufacturing the same

Abstract

The present invention relates to a display panel and a preparation method thereof, the method comprising the following steps: etching a flexible substrate to form a plurality of separately arranged base islands, and forming a stretching zone located between adjacent base islands, forming a first groove and a second groove arranged in parallel in the stretching zone, forming a first metal nanowire layer, a first resin layer, a second metal nanowire layer, a second resin layer, a third metal nanowire layer and a third resin layer in the first groove of the flexible substrate, then forming a first metal nanoparticle layer, a fourth resin layer, a second metal nanoparticle layer, a fifth resin layer, a third metal nanoparticle layer and a sixth resin layer in the second groove of the flexible substrate, forming a display unit on each base island, forming an inorganic encapsulation layer on the flexible substrate, and then forming an organic encapsulation layer on the flexible substrate, the organic encapsulation layer covering the inorganic encapsulation layer and the stretching zone.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor display technology, and in particular to a display panel and a method for preparing the same. Background Art

[0002] With the rapid development and popularization of electronic products equipped with flexible displays, such as smart phones, curved TVs, and car displays, flexible display devices, represented by organic light-emitting diode display devices, are accelerating their entry into the market with their unique performance advantages in display performance, thinness, and bendability. Recently, stretchable display panels with stretchable properties have further promoted the development of flexible display devices. However, the existing stretchable display is prone to breakage in the stretching area during use. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a display panel and a method for manufacturing the same.

[0004] To achieve the above object, the present invention provides a method for preparing a display panel, comprising the following steps:

[0005] (1) A flexible substrate is provided, and the flexible substrate is etched to form a plurality of separately arranged base islands, and a stretching region is formed between adjacent base islands, wherein the thickness of the base islands is greater than the thickness of the stretching region.

[0006] (2) Then, a first groove and a second groove arranged in parallel are formed in the stretching zone, wherein the lengths of the first groove and the second groove are both smaller than the length of the base island.

[0007] (3) Then, a first mask is formed on the flexible substrate to expose the first groove, and then a dispersion containing metal nanowires is sprayed in the first groove to form a first metal nanowire layer in the first groove, and then a resin material is spin-coated on the first metal nanowire layer to form a first resin layer, and then a dispersion containing metal nanowires is sprayed on the first resin layer to form a second metal nanowire layer, and then a resin material is spin-coated on the second metal nanowire layer to form a second resin layer, and then a dispersion containing metal nanowires is sprayed on the second resin layer to form a third metal nanowire layer, and then a resin material is spin-coated on the third metal nanowire layer to form a third resin layer.

[0008] (4) Then, a second mask is formed on the flexible substrate to expose the second groove, and then a dispersion containing metal nanoparticles is sprayed in the second groove to form a first metal nanoparticle layer in the second groove, and then a resin material is spin-coated on the first metal nanoparticle layer to form a fourth resin layer, and then a dispersion containing metal nanoparticles is sprayed on the fourth resin layer to form a second metal nanoparticle layer, and then a resin material is spin-coated on the second metal nanoparticle layer to form a fifth resin layer, and then a dispersion containing metal nanoparticles is sprayed on the fifth resin layer to form a third metal nanoparticle layer, and then a resin material is spin-coated on the third metal nanoparticle layer to form a sixth resin layer.

[0009] (5) Then, a display unit is formed on each base island.

[0010] (6) Then, an inorganic encapsulation layer is formed on the flexible substrate, wherein the inorganic encapsulation layer includes a plurality of inorganic encapsulation units, each of the inorganic encapsulation units encapsulates a corresponding display unit, and the inorganic encapsulation layer does not cover the stretching area.

[0011] (7) Then, an organic encapsulation layer is formed on the flexible substrate, wherein the organic encapsulation layer covers the inorganic encapsulation layer and the stretching area.

[0012] Preferably, in step (1), the material of the flexible substrate is polyimide, thermoplastic polyurethane, polyethylene terephthalate, polyphenylene ether sulfone or polycarbonate, and the base island and the stretching area are formed by a laser ablation process.

[0013] Preferably, in step (2), the first grooves and the second grooves are both multiple, and the multiple first grooves and the multiple second grooves correspond to each other one by one, and the ratio of the thickness of the stretching zone to the depth of the first groove is 3-6, and the ratio of the thickness of the stretching zone to the depth of the second groove is 4-8.

[0014] Preferably, in the step (3), the concentration of the nanowires in the dispersion containing the metal nanowires is 20-50 mg / ml, the diameter of the metal nanowires is 10-80 nanometers, the length of the metal nanowires is 800-2000 nanometers, the material of the metal nanowires is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the first, second, and third resin layers is the same as that of the flexible substrate.

[0015] Preferably, in the step (4), the concentration of the metal nanoparticles in the dispersion containing the metal nanoparticles is 25-60 mg / ml, the diameter of the metal nanoparticles is 40-100 nanometers, the material of the metal nanoparticles is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the fourth, fifth, and sixth resin layers is the same as that of the flexible substrate.

[0016] Preferably, in step (5), each of the display units includes at least one organic light emitting diode and at least one thin film transistor electrically connected to the at least one organic light emitting diode.

[0017] Preferably, in step (6), the material of the inorganic encapsulation layer is one or more of silicon oxide, zirconium oxide, aluminum oxide, silicon nitride, aluminum nitride, and silicon oxynitride.

[0018] Preferably, in step (7), the material of the organic encapsulation layer is one of polyimide, thermoplastic polyurethane, polydimethylsiloxane and silicone.

[0019] The present invention also provides a display panel, which is manufactured by the above method.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] In the preparation process of the display panel of the present invention, a first groove and a second groove arranged in parallel are formed in the stretching zone, and a metal nanowire / resin laminated structure is formed in the first groove, and a metal nanoparticle / resin laminated structure is formed in the second groove. The presence of the above metal nanowire / resin laminated structure and the metal nanoparticle / resin laminated structure can increase the toughness of the stretching zone during the stretching process of the display panel of the present invention, effectively prevent the stretching zone from breaking, and will not affect the stretching and bending performance of the stretching zone. On the other hand, the stability of the display panel can be ensured, that is, the display panel of the present invention will not have undesirable deformation without applying external force, and the presence of metal nanowires and metal nanoparticles can absorb stress during the stretching or bending process, that is, play a buffering role. In the present invention, by providing the metal nanoparticle / resin laminated structure and the metal nanowire / resin laminated structure, the stability of the bonding can be ensured, and the peeling of the metal nanowire layer or the metal nanoparticle layer can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1-Figure 6 It is a structural schematic diagram of the manufacturing process of the display panel of the present invention. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0024] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be considered part of the authorization specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0025] The present invention provides a method for manufacturing a display panel, comprising the following steps:

[0026] (1) A flexible substrate is provided, and the flexible substrate is etched to form a plurality of separately arranged base islands, and a stretching region is formed between adjacent base islands, wherein the thickness of the base islands is greater than the thickness of the stretching region.

[0027] (2) Then, a first groove and a second groove arranged in parallel are formed in the stretching zone, wherein the lengths of the first groove and the second groove are both smaller than the length of the base island.

[0028] (3) Then, a first mask is formed on the flexible substrate to expose the first groove, and then a dispersion containing metal nanowires is sprayed in the first groove to form a first metal nanowire layer in the first groove, and then a resin material is spin-coated on the first metal nanowire layer to form a first resin layer, and then a dispersion containing metal nanowires is sprayed on the first resin layer to form a second metal nanowire layer, and then a resin material is spin-coated on the second metal nanowire layer to form a second resin layer, and then a dispersion containing metal nanowires is sprayed on the second resin layer to form a third metal nanowire layer, and then a resin material is spin-coated on the third metal nanowire layer to form a third resin layer.

[0029] (4) Then, a second mask is formed on the flexible substrate to expose the second groove, and then a dispersion containing metal nanoparticles is sprayed in the second groove to form a first metal nanoparticle layer in the second groove, and then a resin material is spin-coated on the first metal nanoparticle layer to form a fourth resin layer, and then a dispersion containing metal nanoparticles is sprayed on the fourth resin layer to form a second metal nanoparticle layer, and then a resin material is spin-coated on the second metal nanoparticle layer to form a fifth resin layer, and then a dispersion containing metal nanoparticles is sprayed on the fifth resin layer to form a third metal nanoparticle layer, and then a resin material is spin-coated on the third metal nanoparticle layer to form a sixth resin layer.

[0030] (5) Then, a display unit is formed on each base island.

[0031] (6) Then, an inorganic encapsulation layer is formed on the flexible substrate, wherein the inorganic encapsulation layer includes a plurality of inorganic encapsulation units, each of the inorganic encapsulation units encapsulates a corresponding display unit, and the inorganic encapsulation layer does not cover the stretching area.

[0032] (7) Then, an organic encapsulation layer is formed on the flexible substrate, wherein the organic encapsulation layer covers the inorganic encapsulation layer and the stretching area.

[0033] Furthermore, in the step (1), the material of the flexible substrate is polyimide, thermoplastic polyurethane, polyethylene terephthalate, polyphenylene ether sulfone or polycarbonate, and the base island and the stretching area are formed by a laser ablation process.

[0034] Furthermore, in the step (2), the first groove and the second groove are both multiple, and the multiple first grooves and the multiple second grooves correspond to each other one by one, and the ratio of the thickness of the stretching zone to the depth of the first groove is 3-6, and the ratio of the thickness of the stretching zone to the depth of the second groove is 4-8.

[0035] Furthermore, in the step (3), the concentration of the nanowires in the dispersion containing the metal nanowires is 20-50 mg / ml, the diameter of the metal nanowires is 10-80 nanometers, the length of the metal nanowires is 800-2000 nanometers, the material of the metal nanowires is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the first, second, and third resin layers is the same as that of the flexible substrate.

[0036] Furthermore, in the step (4), the concentration of the metal nanoparticles in the dispersion containing the metal nanoparticles is 25-60 mg / ml, the diameter of the metal nanoparticles is 40-100 nanometers, the material of the metal nanoparticles is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the fourth, fifth, and sixth resin layers is the same as that of the flexible substrate.

[0037] Furthermore, in step (5), each of the display units includes at least one organic light emitting diode and at least one thin film transistor electrically connected to the at least one organic light emitting diode.

[0038] Furthermore, in step (6), the material of the inorganic encapsulation layer is one or more of silicon oxide, zirconium oxide, aluminum oxide, silicon nitride, aluminum nitride, and silicon oxynitride.

[0039] Furthermore, in step (7), the material of the organic encapsulation layer is one of polyimide, thermoplastic polyurethane, polydimethylsiloxane, and silicone.

[0040] The present invention also provides a display panel, which is manufactured by the above method.

[0041] See also Figure 1-6 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner, so the illustrations only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation may be changed at will, and the component layout type may also be more complicated. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions is enlarged, and the same figure marks are used to represent the same devices, so their descriptions will be omitted.

[0042] Please refer to Figure 1-6 The present invention provides a method for preparing a display panel, comprising the following steps:

[0043] like Figure 1As shown, in step (1), a flexible substrate 1 is provided, and the flexible substrate 1 is etched to form a plurality of separately arranged base islands 11, and a stretching area 12 is formed between adjacent base islands 11, wherein the thickness of the base islands 11 is greater than the thickness of the stretching area 12. Then in step (2), a first groove 121 and a second groove 122 arranged in parallel are formed in the stretching area 12, wherein the lengths of the first and second grooves 121 / 122 are both less than the lengths of the corresponding base islands.

[0044] Wherein, in the step (1), the material of the flexible substrate 1 is polyimide, thermoplastic polyurethane, polyethylene terephthalate, polyphenylene ether sulfone or polycarbonate, and the base island 11 and the stretching area 12 are formed by laser ablation process. In the step (2), the first groove 121 and the second groove 122 are both multiple, and the multiple first grooves 121 and the multiple second grooves 122 correspond to each other one by one, and the ratio of the thickness of the stretching area 12 to the depth of the first groove 121 is 3-6, and the ratio of the thickness of the stretching area 12 to the depth of the second groove 122 is 4-8.

[0045] In a specific embodiment, the flexible substrate 1 can be a polyimide flexible substrate or a polyethylene terephthalate flexible substrate. In one embodiment, only one first groove 121 and one second groove 122 are formed in a stretching area between two adjacent base islands 11, and the lengths of the first and second grooves 121 / 122 are both less than the lengths of the corresponding base islands, and the length of the first groove 121 is the same as the length of the second groove. The first and second grooves 121 / 122 correspond to the middle area of ​​the base island. More specifically, the ratio of the length of the base island to the length of the first groove is 1.2-1.6. Preferably, the ratio of the length of the base island to the length of the first groove is 1.4, the ratio of the thickness of the stretching area 12 to the depth of the first groove 121 is 4 or 5, and the ratio of the thickness of the stretching area 12 to the depth of the second groove 122 is 5, 6 or 7. By optimizing the specific sizes of the first groove and the second groove, the structural stability of the display panel can be ensured. In another embodiment, only a plurality of first grooves 121 and a plurality of second grooves 122 are formed in a stretching area between two adjacent base islands 11, the lengths of the first and second grooves 121 / 122 are both less than the lengths of the corresponding base islands, and the length of the first groove 121 is the same as the length of the second groove, the plurality of first grooves 121 and the plurality of second grooves 122 are arranged at intervals, the first grooves 121 and the second grooves 122 correspond to each other one by one, the number of the first and second grooves 121 / 122 can be 3-8, more specifically 5, the first grooves 121 / 122 can be 5-8, and the first grooves 121 / 122 can be 5-8, and the first grooves 121 / 122 can be 5-8, and the first grooves 121 / 122 can be 5-5. The length of the groove 121 is greater than the spacing distance between adjacent first grooves 121. More specifically, the ratio of the length of the first groove 121 to the spacing distance between adjacent first grooves 121 is 1.8-3. More specifically, the ratio of the length of the first groove 121 to the spacing distance between adjacent first grooves 121 is 2.5, so that multiple first grooves 121 are evenly arranged along the stretching zone 12, the ratio of the thickness of the stretching zone 12 to the depth of the first groove 121 is 4 or 5, and the ratio of the thickness of the stretching zone 12 to the depth of the second groove 122 is 5, 6 or 7.

[0046] like Figure 2As shown, in step (3), a first mask 2 is then formed on the flexible substrate 1 to expose the first groove 121, and then a dispersion containing metal nanowires is sprayed in the first groove 121 to form a first metal nanowire layer 31 in the first groove, and then a resin material is spin-coated on the first metal nanowire layer 31 to form a first resin layer 32, and then a dispersion containing metal nanowires is sprayed on the first resin layer 32 to form a second metal nanowire layer 33, and then a resin material is spin-coated on the second metal nanowire layer 33 to form a second resin layer 34, and then a dispersion containing metal nanowires is sprayed on the second resin layer 34 to form a third metal nanowire layer 35, and then a resin material is spin-coated on the third metal nanowire layer 35 to form a third resin layer 36, and then the first mask 2 is removed.

[0047] Wherein, in the step (3), the concentration of the nanowires in the dispersion containing the metal nanowires is 20-50 mg / ml, the diameter of the metal nanowires is 10-80 nanometers, the length of the metal nanowires is 800-2000 nanometers, the material of the metal nanowires is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the first, second, and third resin layers is the same as that of the flexible substrate.

[0048] In a specific embodiment, a photoresist is applied on the flexible substrate 1, and an exposure and development process is performed to form a first mask 2 exposing the first groove 121. The metal nanowires can be specifically metal silver nanowires. The concentration of the nanowires in the dispersion containing the metal silver nanowires can be specifically 25 mg / ml, 30 mg / ml, 35 mg / ml, 40 mg / ml or 45 mg / ml. The diameter of the metal silver nanowires can be 20-60 nanometers, the length of the metal silver nanowires is 1000-1800 nanometers, and the first, second, and third metal nanowire layers of appropriate thickness can be formed by multiple spraying. By setting the materials of the first, second, and third resin layers to be the same as the material of the flexible substrate, the bonding stability between the resin layer and the flexible substrate can be ensured.

[0049] like Figure 3As shown, in step (4), a second mask 4 is formed on the flexible substrate 1 to expose the second groove 122, and then a dispersion containing metal nanoparticles is sprayed in the second groove 122 to form a first metal nanoparticle layer 51 in the second groove 122, and then a resin material is spin-coated on the first metal nanoparticle layer 51 to form a fourth resin layer 52, and then a dispersion containing metal nanoparticles is sprayed on the fourth resin layer 52 to form a second metal nanoparticle layer 53, and then a resin material is spin-coated on the second metal nanoparticle layer 53 to form a fifth resin layer 54, and then a dispersion containing metal nanoparticles is sprayed on the fifth resin layer 54 to form a third metal nanoparticle layer 55, and then a resin material is spin-coated on the third metal nanoparticle layer 55 to form a sixth resin layer 56, and then the second mask 4 is removed.

[0050] Wherein, in the step (4), the concentration of the metal nanoparticles in the dispersion containing metal nanoparticles is 25-60 mg / ml, the diameter of the metal nanoparticles is 40-100 nanometers, the material of the metal nanoparticles is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the fourth, fifth, and sixth resin layers is the same as that of the flexible substrate.

[0051] In a specific embodiment, a photoresist is applied on the flexible substrate 1, and an exposure and development process is performed to form a second mask 4 exposing the second groove 122. The metal nanoparticles may be metal silver nanoparticles. The concentration of the nanoparticles in the dispersion containing the metal silver nanoparticles may be 30 mg / ml, 35 mg / ml, 40 mg / ml, 50 mg / ml or 55 mg / ml. The diameter of the metal silver nanoparticles may be 50-80 nanometers. The first, second and third metal nanoparticle layers of appropriate thickness may be formed by multiple spraying. The materials of the fourth, fifth and sixth resin layers are the same as those of the flexible substrate, so that the bonding stability between the resin layer and the flexible substrate can be ensured.

[0052] like Figure 4 As shown, in step (5), a display unit 6 is then formed on each base island 11, each of the display units 6 including at least one organic light emitting diode and at least one thin film transistor electrically connected to the at least one organic light emitting diode.

[0053] In a specific embodiment, the organic light emitting diode is used to emit red light, blue light, green light or white light. First, a buffer layer is formed on each of the base islands 11, and then a top-gate thin film transistor or a bottom-gate thin film transistor is formed on the buffer layer. More specifically, taking a top-gate thin film transistor as an example, a semiconductor active layer is formed on the buffer layer, and then a gate insulating layer is formed on the semiconductor active layer, and then a gate electrode is formed on the gate insulating layer, and then an interlayer insulating layer is formed on the gate electrode, and then the interlayer insulating layer and the gate insulating layer are opened and a conductive material is deposited to form a source electrode and a drain electrode, and then a planarization layer is formed on the interlayer insulating layer, and the planarization layer is an organic resin or an inorganic insulating material, and then an organic light emitting diode is arranged on the planarization layer, and the organic light emitting diode may include a first electrode, a functional layer and a second electrode, and the functional layer includes a hole transport layer, a hole injection layer, a light emitting layer, an electron transport layer, and an electron injection layer. Furthermore, a conductive connection line is provided between adjacent display units 6 , and the conductive connection line is provided on the stretching area 12 between two adjacent base islands 11 .

[0054] like Figure 5 As shown, in step (6), an inorganic encapsulation layer is formed on the flexible substrate 1, and the inorganic encapsulation layer includes a plurality of inorganic encapsulation units 7, each of the inorganic encapsulation units 7 encapsulates a corresponding display unit 6, and the inorganic encapsulation layer does not cover the stretching area 12.

[0055] The material of the inorganic encapsulation layer 7 is one or more of silicon oxide, zirconium oxide, aluminum oxide, silicon nitride, aluminum nitride, and silicon oxynitride. The inorganic encapsulation layer 7 may be a single-layer structure or a multi-layer stacked structure.

[0056] like Figure 6 As shown, (7) an organic encapsulation layer 8 is then formed on the flexible substrate 1 , and the organic encapsulation layer 8 covers the inorganic encapsulation layer and the stretching area 12 .

[0057] Wherein, in the step (7), the material of the organic encapsulation layer 8 is one of polyimide, thermoplastic polyurethane, polydimethylsiloxane, and silicone, and the organic encapsulation layer is formed by spin coating, spray coating, molding, and scraping.

[0058] The present invention also provides a display panel, such as Figure 6As shown, it is prepared by the above method. In the preparation process of the display panel of the present invention, a first groove and a second groove arranged in parallel are formed in the stretching zone, and a metal nanowire / resin laminated structure is formed in the first groove, and a metal nanoparticle / resin laminated structure is formed in the second groove. The presence of the above metal nanowire / resin laminated structure and the metal nanoparticle / resin laminated structure can increase the toughness of the stretching zone during the stretching process of the display panel of the present invention, effectively prevent the stretching zone from breaking, and will not affect the stretching and bending performance of the stretching zone. On the other hand, it can ensure the stability of the display panel, that is, in the absence of external force, the display panel of the present invention will not have unexpected deformation, and in the process of stretching or bending, the presence of metal nanowires and metal nanoparticles can absorb stress, that is, play a buffering role. In the present invention, by providing the presence of the metal nanoparticle / resin laminated structure and the metal nanowire / resin laminated structure, the stability of the bonding can be ensured, and the peeling of the metal nanowire layer or the metal nanoparticle layer can be effectively prevented.

[0059] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a display panel, characterized in that: The following steps are involved: (1) providing a flexible substrate, etching the flexible substrate to form a plurality of separately arranged base islands, and forming a stretching region between adjacent base islands, wherein the thickness of the base islands is greater than the thickness of the stretching region; (2) forming a first groove and a second groove arranged in parallel in the stretching zone, wherein the lengths of the first groove and the second groove are both smaller than the length of the base island; (3) forming a first mask on the flexible substrate to expose the first groove, spraying a dispersion containing metal nanowires in the first groove to form a first metal nanowire layer in the first groove, spin-coating a resin material on the first metal nanowire layer to form a first resin layer, spraying a dispersion containing metal nanowires on the first resin layer to form a second metal nanowire layer, spin-coating a resin material on the second metal nanowire layer to form a second resin layer, spraying a dispersion containing metal nanowires on the second resin layer to form a third metal nanowire layer, and spin-coating a resin material on the third metal nanowire layer to form a third resin layer; (4) forming a second mask on the flexible substrate to expose the second groove, spraying a dispersion containing metal nanoparticles in the second groove to form a first metal nanoparticle layer in the second groove, spin-coating a resin material on the first metal nanoparticle layer to form a fourth resin layer, spraying a dispersion containing metal nanoparticles on the fourth resin layer to form a second metal nanoparticle layer, spin-coating a resin material on the second metal nanoparticle layer to form a fifth resin layer, spraying a dispersion containing metal nanoparticles on the fifth resin layer to form a third metal nanoparticle layer, and spin-coating a resin material on the third metal nanoparticle layer to form a sixth resin layer; (5) Then, a display unit is formed on each base island; (6) forming an inorganic encapsulation layer on the flexible substrate, wherein the inorganic encapsulation layer includes a plurality of inorganic encapsulation units, each of the inorganic encapsulation units encapsulates a corresponding display unit, and the inorganic encapsulation layer does not cover the stretching area; (7) Then, an organic encapsulation layer is formed on the flexible substrate, wherein the organic encapsulation layer covers the inorganic encapsulation layer and the stretching area.

2. The method for preparing a display panel according to claim 1, wherein: In the step (1), the material of the flexible substrate is polyimide, thermoplastic polyurethane, polyethylene terephthalate, polyphenylene ether sulfone or polycarbonate, and the base island and the stretching area are formed by a laser ablation process.

3. The method for preparing a display panel according to claim 1, wherein: In the step (2), the first groove and the second groove are both multiple, and the multiple first grooves and the multiple second grooves correspond to each other one by one. The ratio of the thickness of the stretching zone to the depth of the first groove is 3-6, and the ratio of the thickness of the stretching zone to the depth of the second groove is 4-8.

4. The method for manufacturing a display panel according to claim 1, wherein: In the step (3), the concentration of the nanowires in the dispersion containing the metal nanowires is 20-50 mg / ml, the diameter of the metal nanowires is 10-80 nanometers, the length of the metal nanowires is 800-2000 nanometers, the material of the metal nanowires is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the first, second, and third resin layers is the same as that of the flexible substrate.

5. The method for preparing a display panel according to claim 1, wherein: In the step (4), the concentration of the metal nanoparticles in the dispersion containing the metal nanoparticles is 25-60 mg / ml, the diameter of the metal nanoparticles is 40-100 nanometers, the material of the metal nanoparticles is one or more of copper, silver, gold, nickel, cobalt, and titanium, and the material of the fourth, fifth, and sixth resin layers is the same as that of the flexible substrate.

6. The method for preparing a display panel according to claim 1, wherein: In the step (5), each of the display units includes at least one organic light emitting diode and at least one thin film transistor electrically connected to the at least one organic light emitting diode.

7. The method for manufacturing a display panel according to claim 1, wherein: In the step (6), the material of the inorganic encapsulation layer is one or more of silicon oxide, zirconium oxide, aluminum oxide, silicon nitride, aluminum nitride, and silicon oxynitride.

8. The method for manufacturing a display panel according to claim 1, wherein: In the step (7), the material of the organic encapsulation layer is one of polyimide, thermoplastic polyurethane, polydimethylsiloxane, and silicone.

9. A display panel, characterized in that: The method is prepared by any one of claims 1 to 8.

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