Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises a display area and a non-display area; the display panel comprises a light-emitting layer, a plurality of first dams, a plurality of second dams, a packaging layer and a light extraction layer. The light-emitting layer is arranged in the display area; the plurality of first dams are arranged in the non-display area and surround the display area; the packaging layer covers the light-emitting layer and the first dam; the light extraction layer is arranged on the side, away from the light-emitting layer, of the packaging layer; the light extraction layer comprises a plurality of refraction blocks and a refraction layer; the orthographic projection of the refraction block on the light-emitting layer covers the light-emitting element; the refraction layer covers the refraction block; the plurality of second dams are arranged in the non-display area and surround the display area; the second dam is arranged on the side, away from the light-emitting layer, of the packaging layer, and the second dam and the refraction block are arranged on the same layer; the second dam is located on one side of the first dam close to the display area; part of the refraction layer is located in the non-display area, the edge of the refraction layer is located on the side, close to the display area, of the first dam, and the overflow section difference is reduced.

Description

Technical Field

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

[0002] With the development of display technology, display panels are widely used in daily work and life and have broad development prospects.

[0003] In order to improve the brightness of light emitted by a display panel, MLA technology (Micro Lens Array) is usually used to improve the light extraction efficiency, thereby achieving improved light brightness.

[0004] However, in the process of preparing the microlens array, the high refractive index material forming the microlens array is prone to overflow, resulting in defects in the display panel. Summary of the invention

[0005] The display panel and its manufacturing method, and the display device provided in the present application are used to improve the defects caused by the overflow of high refractive index materials.

[0006] In order to solve the above technical problems, the first technical solution provided by the present application is: a display panel is provided, including a display area and a non-display area; the display panel includes a light-emitting layer, a plurality of first dams, a plurality of second dams, an encapsulation layer and a light extraction layer; the light-emitting layer is arranged in the display area; the light-emitting layer includes a plurality of light-emitting elements; a plurality of first dams are arranged in the non-display area and are arranged around the display area; the encapsulation layer covers the light-emitting layer and the first dams; the light extraction layer is arranged on a side of the encapsulation layer away from the light-emitting layer; part of the light extraction layer is arranged in the display area, and part of the light extraction layer is arranged in the non-display area; the light extraction layer includes a plurality of refraction blocks and a refraction layer; the orthographic projection of the refraction blocks on the light-emitting layer covers the light-emitting elements; the refraction layer covers the refraction blocks; a plurality of second dams are arranged in the non-display area and are arranged around the display area; the second dams are arranged on a side of the encapsulation layer away from the light-emitting layer, and the second dams are arranged in the same layer as the refraction blocks; the second dams are located on a side of the first dam close to the display area; wherein part of the refraction layer is located in the non-display area, and the edge of the refraction layer is located on a side of the first dam close to the display area.

[0007] In one embodiment, the material of the second dam is the same as that of the refraction block.

[0008] In one embodiment, a height of a second dam farthest from the display area among the plurality of second dams is greater than a thickness of an edge of a partial refractive layer located in the non-display area; and / or a height of the second dam is less than or equal to a thickness of the partial refractive layer located in the display area; wherein the thickness of the edge of the partial refractive layer located in the non-display area is less than the thickness of the partial refractive layer located in the display area.

[0009] In one embodiment, the height of the second dam is greater than or equal to the height of the refraction block.

[0010] In one embodiment, the display panel includes a plurality of second dams arranged at intervals; the plurality of second dams have the same height; or, along a direction from the display area to the non-display area, the heights of the plurality of second dams gradually increase.

[0011] In one embodiment, the surface of the second bank facing away from the light-emitting layer is a curved surface, or the longitudinal cross-section of the second bank is a trapezoid or a rectangle.

[0012] In one embodiment, the refraction block and the second dam are formed simultaneously in the same process; preferably, the refraction block and the second dam are formed simultaneously by using a half-tone mask or a gray-scale mask.

[0013] In one embodiment, the display panel includes a plurality of first dams arranged at intervals, and the edge of the refractive layer is located on a side of a first dam closest to the display area among the plurality of first dams close to the display area;

[0014] Preferably, the display panel comprises a plurality of second dams arranged at intervals, and the edge of the refractive layer is located on a side of the second dam farthest from the display area among the plurality of second dams close to the display area;

[0015] Preferably, the encapsulation layer includes two inorganic encapsulation film layers and one organic encapsulation film layer, and the organic encapsulation film layer is arranged between the two inorganic encapsulation film layers; the two inorganic encapsulation film layers respectively cover the light-emitting layer and the first dam; the organic encapsulation film layer covers the light-emitting layer, and the edge of the organic encapsulation film layer extends to the side of the first dam close to the display area.

[0016] In order to solve the above technical problem, the second technical solution provided in the present application is: to provide a display device, comprising any one of the display panels described above.

[0017] In order to solve the above technical problems, the third technical solution provided in the present application is: to provide a method for preparing a display panel of any of the above items, the display panel including a display area and a non-display area; including: obtaining a display panel preform; wherein the display panel preform includes a light-emitting layer, a plurality of first dams and an encapsulation layer; the light-emitting layer is arranged in the display area; the plurality of first dams are arranged in the non-display area and are arranged around the display area; the encapsulation layer covers the light-emitting layer and the first dams; a plurality of refraction blocks and a plurality of second dams are simultaneously formed on one side of the display panel preform; wherein the material of the second dam is the same as that of the refraction block; the plurality of refraction blocks are arranged corresponding to the light-emitting layer; the plurality of second dams are arranged in the non-display area and are arranged around the display area, and the second dams are located on the side of the first dam close to the display area; and a refraction layer is formed on one side of the refraction block.

[0018] Beneficial effects of the present application: Different from the prior art, the present application discloses a display panel and a preparation method thereof, and a display device; the display panel includes a light-emitting layer, a plurality of first dams, a plurality of second dams, an encapsulation layer and a light extraction layer; the light-emitting layer is arranged in the display area; a plurality of first dams are arranged in the non-display area and are arranged around the display area; the encapsulation layer covers the light-emitting layer and the first dams; the light extraction layer is arranged on a side of the encapsulation layer away from the light-emitting layer; the light extraction layer includes a plurality of refraction blocks and a refraction layer; the refraction blocks are arranged corresponding to the light-emitting layer; the refraction layer covers the refraction blocks; a plurality of second dams are arranged in the non-display area and are arranged around the display area; the second dams are arranged on a side of the encapsulation layer away from the light-emitting layer, and the second dams are arranged in the same layer as the refraction blocks; the second dams are located on a side of the first dam close to the display area; wherein part of the refraction layer is located in the non-display area, and an edge of the refraction layer is located on a side of the first dam close to the display area. By setting the second dam on the side of the first dam close to the display area, during the process of forming the refractive layer, the second dam blocks the refractive layer material from overflowing to the side of the first dam away from the second dam, keeping the edge of the refractive layer located on the side of the first dam close to the display area, and reducing the overflow area step difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0021] Figure 2 yes Figure 1 The cross-sectional structure diagram of the display area of ​​the display panel along the AA line is shown;

[0022] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of the second dam and the refractive layer shown;

[0023] Figure 4 yes Figure 2 A schematic structural diagram of an embodiment of a plurality of second dams shown;

[0024] Figure 5 yes Figure 2 A schematic structural diagram of another embodiment of the plurality of second dams shown;

[0025] Figure 6 yes Figure 2 A schematic structural diagram of an embodiment of a second dam is shown;

[0026] Figure 7 yes Figure 2 A schematic structural diagram of another embodiment of the second dam shown;

[0027] Figure 8 yes Figure 2 A schematic structural diagram of another embodiment of the second dam is shown;

[0028] Fig. 9 is a schematic diagram of a process for preparing a display panel provided in an embodiment of the present application;

[0029] Fig.10 yes Fig. 9 The structural diagram of step S01 shown;

[0030] Fig.11 yes Fig. 9 The structural diagram of step S02 shown;

[0031] Fig.12 yes Fig. 9 The structural diagram of step S03 is shown. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0034] The terms "first", "second", and "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of this application and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products, or devices.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0037] In order to improve the light output brightness of a display panel, MLA technology (Micro Lens Array) is usually used to improve the light extraction efficiency, thereby improving the light output brightness.

[0038] MLA technology is achieved by integrating a tiny lens structure above the light-emitting layer and covering the lens structure with a high refractive index coating; each lens corresponds to one or more sub-pixels, and its function is to collect and guide light that may have been absorbed or scattered inside the panel, allowing more light to penetrate the panel, thereby achieving higher light output brightness. Among them, the high refractive index coating usually uses a high refractive index material (HRI, High Refractive Material) to cover the lens structure by printing. The refractive index of the high refractive index coating is greater than the refractive index of the lens structure.

[0039] In the process of forming a high-refractive index coating, the high-refractive index material is prone to overflow problems, such as overflowing to the side of the dam away from the display area, causing a defective display panel. For the problem of overflow of high-refractive index materials, the overflow degree is currently mainly controlled by controlling the leveling time and printing cut-off position during the printing process of the high-refractive index material. Due to the limitation of process capabilities, overflow control failure is prone to occur, that is, the high-refractive index material still overflows to the side of the dam away from the display area. It should be noted that the function of the above-mentioned dam is to form the boundary of the organic encapsulation film layer of the thin film encapsulation (TFE, Thin Film Encapsulation, thin film encapsulation includes alternating inorganic encapsulation film layers and organic encapsulation film layers), hindering the spread of the organic encapsulation film layer in the non-display area.

[0040] In view of this, the present application provides a display panel and a method for manufacturing the same, and a display device to improve the defects caused by overflow of high refractive index materials.

[0041] See also Figure 1 to Figure 2 , Figure 1 is a schematic diagram of the structure of a display panel provided in an embodiment of the present application, Figure 2 yes Figure 1 The cross-sectional structure diagram of the display area of ​​the display panel along the AA line is shown.

[0042] The display panel includes a display area AA and a non-display area NA. The display area AA is a region of the display panel for displaying images. The non-display area NA is arranged around the circumference of the display area AA.

[0043] The display panel includes a substrate 11 , a driving layer 12 , a pixel definition layer 13 , a light emitting layer 14 , an encapsulation layer 15 , a light extraction layer 16 , a plurality of first dams 17 and a plurality of second dams 18 which are stacked in sequence.

[0044] Part of the substrate 11 is located in the display area AA, and part of it is located in the non-display area NA. The substrate 11 plays a supporting role in the display panel, and it can be a flexible substrate or a rigid substrate. When the substrate 11 is a flexible substrate, its material can be polyimide (PI), or it can be a multilayer structure in which organic layers and inorganic layers are alternately stacked; for example, the substrate 11 includes an inorganic layer, an organic layer, and an inorganic layer stacked in sequence. At this time, the multilayer structure in which the organic layer and the inorganic layer are alternately stacked can take into account the flexibility and strength of the substrate 11, so that the display panel has a bendable function and can resist fracture and deformation. When the substrate 11 is a rigid substrate, its material can be glass or metal. The present application does not limit the structure of the substrate 11.

[0045] The driving layer 12 is arranged on one side of the substrate 11; and part of the driving layer 12 is located in the display area AA, and part of the driving layer 12 is located in the non-display area NA. The driving layer 12 includes a pixel driving circuit 120, and the pixel driving circuit 120 includes a transistor 121 and a storage capacitor 122. The transistor 121 includes a semiconductor portion 1211, a gate 1212, a source 1213 and a drain 1214. The storage capacitor 122 includes a first electrode 1221 and a second electrode 1222. Among them, the gate 1212 and the first electrode 1221 can be located in the first metal layer, the second electrode 1222 can be located in the second metal layer, and the source 1213 and the drain 1214 can be located in the third metal layer. An interlayer insulating layer is provided between the first metal layer and the second metal layer, and between the second metal layer and the third metal layer. At the same time, the driving layer 12 can also include a fourth metal layer, and the fourth metal layer is provided with a signal line, which electrically connects the pixel driving circuit 120 and the light-emitting element 141 of the light-emitting layer 14.

[0046] The pixel driving circuit 120 may be a 2T1C circuit, a 7T1C circuit, a 7T2C circuit, or a 9T1C circuit, etc., and the present application does not limit its specific structure. Among them, "2T1C circuit" refers to a pixel circuit including two thin film transistors (T) and one capacitor (C) in the pixel driving circuit 120, and other "7T1C circuit", "7T2C circuit", "9T1C circuit" and so on are analogous.

[0047] The pixel definition layer 13 is disposed on the side of the driving layer 12 facing away from the substrate 11, and the pixel definition layer 13 is located in the display area AA. The pixel definition layer 13 is formed with a pixel opening, and the light-emitting element 141 of the light-emitting layer 14 is disposed in the pixel opening; it can be understood that the light-emitting layer 14 is located in the display area AA. The pixel definition layer 13 can be formed of an organic material such as polyimide (PI), polyamide, benzocyclobutene (BCB), acrylic resin or phenolic resin, or a polyimide such as SiN x In one embodiment, the material of the pixel definition layer 13 includes a light absorbing material, which can prevent the light emitted by two adjacent light emitting elements 141 from crosstalking.

[0048] The light-emitting layer 14 includes a light-emitting element 141. The number of the light-emitting element 141 may be one or more. When the number of the light-emitting element 141 is more than one, the light-emitting color of some light-emitting elements 141 is red, the light-emitting color of some light-emitting elements 141 is green, and the light-emitting color of some light-emitting elements 141 is blue. It should be noted that the color of the light emitted by the light-emitting element 141 may not be limited to red, green, and blue, but may also be yellow or other colors, which are not limited here.

[0049] The light emitting element 141 includes a first electrode 1411 , a light emitting material layer 1412 , and a second electrode 1413 which are stacked in sequence. The first electrode 1411 is located on a side of the light emitting material layer 1412 close to the driving layer 12 .

[0050] A plurality of first dams 17 are disposed on a side of the driving layer 12 away from the substrate 11, and a plurality of first dams 17 are disposed in the non-display area NA. The first dams 17 are disposed around the display area AA.

[0051] The encapsulation layer 15 covers the light emitting layer 14 and the first dam 17, that is, the encapsulation layer 15 is arranged on the side of the light emitting layer 14 and the first dam 17 away from the substrate 11; the encapsulation layer 15 is partially located in the display area AA, and partially located in the non-display area NA. The encapsulation layer 15 is used to encapsulate the light emitting layer 14, which is beneficial to prevent the external moisture and oxygen from affecting the light emitting layer 14; the encapsulation layer 15 is also used to encapsulate the driving layer 12 and other devices in the non-display area NA, which is beneficial to prevent the external moisture and oxygen from affecting the driving layer 12 and other devices in the non-display area NA.

[0052] The encapsulation layer 15 includes a plurality of stacked inorganic encapsulation film layers 151 and at least one organic encapsulation film layer 152 . The at least one organic encapsulation film layer 152 is disposed between the plurality of inorganic encapsulation film layers 151 . The plurality of inorganic encapsulation film layers 151 form a closed space that seals the organic encapsulation film layer 152 .

[0053] It should be noted that the inorganic encapsulation film layer 151 can minimize or completely prevent the penetration of moisture, oxygen and / or hydrogen into the driving layer 12 and the light-emitting layer 14. Therefore, as an embodiment, the inorganic encapsulation film layer 151 and the organic encapsulation film layer 152 can be alternately stacked, and the inorganic encapsulation film layer 151 can be set as the top and bottom layers of the encapsulation layer 15, and the top inorganic encapsulation film layer can completely cover the organic encapsulation film layer 152, thereby forming a barrier space that can block the entry of water and oxygen. Exemplarily, the encapsulation layer 15 includes two layers of inorganic encapsulation film layers 151 and one layer of organic encapsulation film layer 152, and the organic encapsulation film layer 152 is arranged between the two layers of inorganic encapsulation film layers 151; the two layers of inorganic encapsulation film layers 151 cover the light-emitting layer 14 and the first dam 17 respectively; the organic encapsulation film layer 152 covers the light-emitting layer 14, and the edge of the organic encapsulation film layer 152 extends to the side of the first dam 17 close to the display area AA. Exemplarily, the inorganic encapsulation film layer 151 is formed by chemical vapor deposition. Exemplarily, the organic encapsulation film layer 152 is formed by inkjet printing.

[0054] The formation process of the organic encapsulation film layer 152 of the encapsulation layer 15 is from liquid phase to solid phase. For example, the organic encapsulation film layer 152 can be formed by an inkjet method. When the organic encapsulation film layer 152 in the liquid phase drips onto the display area AA, in order to prevent the organic encapsulation material in the liquid phase from flowing and spreading in the non-display area NA and causing defects, a first dam 17 is provided in the non-display area NA of the display panel. The organic encapsulation material in the liquid phase flows to the first dam 17 and the flow path is cut off. The first dam 17 can form the boundary of the organic encapsulation film layer 152. The first dam 17 is arranged around the display area AA to reduce the defects caused by the spread of the organic encapsulation film layer 152 to the non-display area NA. The inorganic encapsulation film layer 151 of the encapsulation layer 15 covers the first dam 17.

[0055] The light extraction layer 16 is used to improve the extraction efficiency of the light emitting layer 14, thereby improving the light output intensity of the light emitting layer 14. The light extraction layer 16 is arranged on the side of the encapsulation layer 15 away from the driving layer 12. In other words, the light extraction layer 16 is arranged on the side of the encapsulation layer 15 away from the light emitting layer 14. Part of the light extraction layer 16 is arranged in the display area AA, and part of the light extraction layer 16 is arranged in the non-display area BB. The light extraction layer 16 includes a plurality of refraction blocks 161 and a refraction layer 162. The plurality of refraction blocks 161 are arranged on the side of the light emitting layer 14 away from the substrate 11, and the orthographic projection of the refraction blocks 161 on the light emitting layer 14 covers the light emitting element 141; the plurality of refraction blocks 161 are located in the display area AA, and the plurality of refraction blocks 161 are arranged one-to-one with the plurality of light emitting elements 141. The refraction layer 162 covers the refraction blocks 161; specifically, part of the refraction layer 162 is arranged on the side of the refraction block 161 away from the light emitting layer 14, and part of the refraction layer 162 is arranged between adjacent refraction blocks 161; most of the refraction layer is located in the display area AA. In one embodiment, the light extraction layer 16 may be formed by MLA technology. In one embodiment, the refractive layer 162 may be formed of a high refractive index material; the refractive block 161 may be a refractive lens; and the refractive index of the refractive layer 162 may be greater than that of the refractive block 161 .

[0056] It should be noted that the formation process of the refractive layer 162 is from liquid phase to solid phase. For example, the refractive layer 162 can be formed by printing using a high refractive index material. When the high refractive index material in the liquid phase is printed, the high refractive index material will spread to the non-display area NA due to the fluidity of the liquid phase material. Therefore, part of the refractive layer 162 is located in the display area AA, and part of the refractive layer 162 is located in the non-display area NA.

[0057] A plurality of second dams 18 are provided in the non-display area NA, and the second dams 18 are provided around the display area AA. The second dams 18 are located on the side of the first dam 17 close to the display area AA. The second dam 18 is provided on the side of the encapsulation layer 15 away from the substrate 11; in other words, the second dam 18 is provided on the side of the encapsulation layer 15 away from the light-emitting layer 14. The second dam 18 is provided in the same layer as the refraction block 161. By providing the second dam 18 in the non-display area AA, the second dam 18 is used to hinder the spread of the material forming the refraction layer 162 in the liquid phase. The second dam 18 forms the boundary of the refraction layer 162, hinders the material of the refraction layer 162 from overflowing to the side of the first dam 17 away from the display area AA, and controls the overflow boundary of the liquid phase refraction layer 162 material to be within the first dam 17, that is, the edge of the refraction layer 162 is located on the side of the first dam 17 close to the display area AA.

[0058] By keeping the edge of the refractive layer 162 located on the side of the first dam 17 close to the display area AA, the overflow area step difference is reduced. In the process of preparing the display panel, after the substrate 11, the driving layer 12, the light-emitting layer 14, the encapsulation layer 15 and the light extraction layer 16 are formed, the device will be turned over and the support layer 19 will be attached to the side of the substrate 11 away from the driving layer 12; the edge of the refractive layer 162 is located on the side of the first dam 17 close to the display area AA, and the overflow step difference is small, which is conducive to reducing bubbles between the part of the support layer 19 located in the non-display area NA and the substrate 11, reducing bubbles in the cutting path, and reducing the impact on cutting.

[0059] In one embodiment, the material of the second bank 18 is the same as that of the refractive block 161. The second bank 18 and the refractive block 161 can be formed simultaneously by the same process, and the second bank 18 does not need to introduce a new process.

[0060] In one embodiment, the refraction block 161 and the second dam 18 are formed simultaneously in the same process. Optionally, the refraction block 161 and the second dam 18 are formed simultaneously by a half-tone mask (HTM) or a gray-tone mask (GTM). The half-tone mask or the gray-tone mask adjusts different film thicknesses by controlling the amount of light transmitted during the exposure process, so that the refraction block 161 and the second dam 18 with different heights can be formed in the same film layer, which is conducive to reducing costs.

[0061] See also Figure 3 , Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of the second dam and the refractive layer is shown.

[0062] In one embodiment, the height of the second dam 18 farthest from the display area AA among the plurality of second dams 18 is greater than the thickness of the edge of the partial refraction layer 162 located in the non-display area NA; and / or the height of the second dam 18 is less than or equal to the thickness of the partial refraction layer 162 located in the display area AA; wherein the thickness of the edge of the partial refraction layer 162 located in the non-display area NA is less than the thickness of the partial refraction layer 162 located in the display area AA.

[0063] The formation process of the refractive layer 162 is from liquid phase to solid phase, and the liquid phase refractive layer 162 material overflows from the display area AA to the non-display area NA; since the refractive layer 162 in the non-display area NA is formed by the overflow of the liquid phase material, the thickness of the refractive layer 162 located in the non-display area NA is along the direction from the display area AA to the non-display area NA, and the thickness of the part of the refractive layer 162 located in the non-display area NA gradually decreases. The thickness of the refractive layer 162 refers to the size of the refractive layer 162 in the direction from the substrate 11 to the driving layer 12; in other words, the thickness of the refractive layer 162 refers to the straight-line distance between the surface of the refractive layer 162 in contact with the encapsulation layer 15 and the surface of the refractive layer 162 away from the encapsulation layer 15.

[0064] By designing the height of the second dam 18 farthest from the display area AA among the plurality of second dams 18 to be greater than the thickness of the edge of the refractive layer 162 located in the non-display area NA, the second dam 18 can be kept capable of cutting off the overflow of the liquid phase refractive layer 162 material, preventing the liquid phase refractive layer 162 material from overflowing to the side of the first dam 17 away from the display area AA, and keeping the edge of the refractive layer 162 located on the side of the first dam 17 close to the display area AA, thereby reducing the overflow step difference. The height of the second dam 18 refers to the maximum dimension of the second dam 18 in the direction from the substrate 11 to the driving layer 12. It should be noted that the thickness of the partial refractive layer 162 located in the non-display area NA can be known from experience, and therefore, the height of the second dam 18 can be designed based on the empirical value of the thickness of the partial refractive layer 162 located in the non-display area NA.

[0065] By designing the height of the second dam 18 to be less than or equal to the thickness of the refractive layer 162 located in the display area AA, the second dam 18 can reduce the interference of the second dam 18 with other film structures formed on the side of the light extraction layer 16 away from the light-emitting layer 14 on the basis of being able to cut off the overflow of the liquid phase refractive layer 162 material. The formation of other film structures on the side of the light extraction layer 16 away from the light-emitting layer 14 can be achieved according to the original process.

[0066] Optionally, the thickness of the portion of the refractive layer 162 located in the display area AA is 9 μm-11 μm. Exemplarily, the thickness of the refractive layer 162 located in the display area AA is 10 μm.

[0067] Optionally, the thickness of the partial refractive layer 162 located in the non-display area NA is 3 μm-5 μm.

[0068] Optionally, the height of the second dam 18 is greater than or equal to 5 μm and less than or equal to 10 μm.

[0069] In one embodiment, the height of the second dam 18 is greater than or equal to the height of the refraction block 161 , wherein the height of the refraction block 161 refers to the maximum dimension of the refraction block 161 in the direction from the substrate 11 to the driving layer 12 .

[0070] The formation process of the refractive layer 162 is from liquid phase to solid phase. The height of the refractive block 161 is set so that the liquid refractive layer 162 material can cover the refractive block 161 during the diffusion process. The height of the refractive block 161 has a small blocking effect on the flow of the liquid refractive layer 162 material. By designing the height of the second dam 18 to be greater than or equal to the height of the refractive block 161, the second dam 18 can cut off the overflow of the liquid refractive layer 162 material, prevent the liquid refractive layer 162 material from overflowing to the side of the first dam 17 away from the display area AA, keep the edge of the refractive layer 162 located on the side of the first dam 17 close to the display area AA, and thus reduce the overflow step difference.

[0071] Optionally, the height of the refraction block 161 is 1.5 μm-2.5 μm. Exemplarily, the height of the refraction block 161 is 2 μm.

[0072] Optionally, the height of the second dam 18 is greater than or equal to 5 μm.

[0073] See also Figure 4 and Figure 5 , Figure 4 yes Figure 2 A schematic structural diagram of an embodiment of a plurality of second dams shown, Figure 5 yes Figure 2 A schematic structural diagram of another embodiment of a plurality of second dams is shown.

[0074] In one embodiment, the display panel includes a plurality of second dams 18 disposed at intervals, and each second dam 18 is disposed around the display area AA. By providing a plurality of second dams 18, a multiple barrier effect is formed, which is conducive to keeping the edge of the refractive layer 162 located on the side of the first dam 17 close to the display area AA. The multiple barrier effects of the plurality of second dams 18 gradually reduce the overflow height of the liquid phase refractive layer 162 material, so that the thickness of the portion of the refractive layer 162 located in the non-display area NA along the direction from the display area AA to the non-display area NA gradually decreases, which is conducive to reducing the overflow step difference.

[0075] Optionally, the heights of the plurality of second dams 18 are the same, which is conducive to reducing the process difficulty of forming the plurality of second dams 18 .

[0076] Optionally, along the direction from the display area AA to the non-display area NA, the heights of the plurality of second dams 18 gradually increase, and the barrier capabilities of the plurality of second dams 18 gradually increase, which is beneficial to keep the edge of the refractive layer 162 located on the side of the first dam 17 close to the display area AA.

[0077] See also Figures 6 to 8 , Figure 6 yes Figure 2 The schematic structural diagram of the second dam embodiment shown in FIG. Figure 7 yes Figure 2 A schematic structural diagram of another embodiment of the second dam is shown, Figure 8 yes Figure 2 A schematic structural diagram of another embodiment of the second dam is shown.

[0078] In one embodiment, if Figure 6 and Figure 7 As shown, the surface of the second dam 18 facing away from the light-emitting layer 14 is a curved surface. By setting the surface of the second dam 18 facing away from the light-emitting layer 14 as a curved surface, it is helpful to reduce the concentration of internal mechanical stress, reduce the risk of cracks or peeling caused by thermal expansion and contraction, and extend the service life; in addition, the design of the curved surface makes it easier to evenly spread other film layer materials when other film layers are formed on the side of the light extraction layer 16 and the second dam 18 away from the light-emitting layer 14, thereby improving the yield rate.

[0079] Optional, such as Figure 6 As shown, the second dam 18 includes a first sub-portion 181 and a second sub-portion 182, the second sub-portion 182 is located on the side of the first sub-portion 181 away from the driving layer 12; the first sub-portion 181 is a columnar structure; the surface of the second sub-portion 182 away from the first sub-portion 181 is a curved surface. In other words, the top surface of the second dam 18 is a curved surface. Along the direction from the substrate 11 to the driving layer 12, the cross-sectional shape of the second sub-portion 182 is the same, and the cross-sectional area of ​​the second sub-portion 182 gradually decreases.

[0080] Optional, such as Figure 7 As shown, along the direction from the substrate 11 to the driving layer 12 , the cross-sectional shape of the second dam 18 is the same, and the cross-sectional area of ​​the second dam 18 gradually decreases, so that the surface of the second dam 18 away from the light-emitting layer 14 is a curved surface.

[0081] In one embodiment, the longitudinal cross-section of the second bank 18 is a trapezoid or a rectangle, and the longitudinal cross-section refers to a cross-section along the direction from the substrate 11 to the driving layer 12. Figure 8 As shown, the longitudinal cross-section of the second dam 18 is trapezoidal.

[0082] It should be noted that the structure of the second dam 18 provided in this application is not limited to Figures 6 to 8The structure shown is specifically designed according to the needs. The half-tone mask or gray-scale mask can control the shape of the second bank 18 by controlling the amount of light transmitted during the exposure process.

[0083] Continue reading Figure 2 The display panel includes a plurality of first dams 17 arranged at intervals, and the plurality of first dams 17 are arranged around the display area AA. The edge of the refractive layer 162 is located on the side of the first dam 17 closest to the display area AA among the plurality of first dams 17, which is close to the display area AA. The second dam 18 arranged between the first dam 17 and the display area AA can prevent the liquid phase refractive layer 162 material from overflowing in the direction close to the first dam 17, and prevent the liquid phase refractive layer 162 material from overflowing between adjacent first dams 17, which is conducive to reducing the overflow step difference, thereby reducing the bubbles between the support layer 19 and the substrate 11, reducing the bubbles in the cutting path, and reducing the impact on the cutting.

[0084] In one embodiment, if Figure 2 As shown, the display panel includes a plurality of second dams 18 arranged at intervals, and the edge of the refractive layer 162 is located on the side of the second dam 18 farthest from the display area AA among the plurality of second dams 18 close to the display area AA. The above arrangement can prevent the liquid phase refractive layer 162 material from overflowing between adjacent first dams 17, which is conducive to reducing the overflow step difference, thereby reducing the bubbles between the support layer 19 and the substrate 11, reducing the bubbles in the cutting path, and reducing the impact on the cutting.

[0085] In one embodiment, a buffer layer may be further disposed between the substrate 11 and the driving layer 12. The buffer layer may absorb and alleviate the internal stress caused by the difference in coefficient of thermal expansion (CTE) between different materials, and help protect delicate circuit structures such as thin film transistors (TFTs); the buffer layer may also serve as a physical barrier to protect the substrate 11 from possible chemical corrosion or physical damage in subsequent processes.

[0086] In one embodiment, the display panel further includes a protective layer and a polarizer. The protective layer and the polarizer are disposed on a side of the encapsulation layer 15 away from the substrate 11. The protective layer is disposed on a side of the polarizer close to the encapsulation layer 15. The polarizer can be disposed on the protective layer by a pressure sensitive adhesive (PSA).

[0087] The embodiment of the present application also provides a display device, which includes the display panel provided by the above embodiment, which is conducive to improving the quality of the display device. The display device can be a desktop computer, a laptop computer, a personal digital assistant (PDA), a mobile phone, a television, etc.

[0088] The present application also provides a method for preparing a display panel, which can be used to prepare the display panel provided in the above embodiment. Figures 9 to 12 , Fig. 9 is a schematic diagram of a method for preparing a display panel provided in an embodiment of the present application, Fig.10 yes Fig. 9 The structural diagram of step S01 shown in FIG. Fig.11 yes Fig. 9 The structural diagram of step S02 shown in FIG. Fig.12 yes Fig. 9 The structural diagram of step S03 is shown.

[0089] The manufacturing method of the display panel is specifically as follows: wherein the display panel includes a display area AA and a non-display area NA.

[0090] Step S01: Obtain a display panel prefabricated component.

[0091] The display panel preform includes a light emitting layer 14, a plurality of first dams 17 and an encapsulation layer 15. The light emitting layer 14 is disposed in the display area AA; the plurality of first dams 17 are disposed in the non-display area NA and surround the display area AA; and the encapsulation layer 15 covers the light emitting layer 14 and the first dams 17.

[0092] The display panel preform also includes a substrate 11 and a driving layer 12. The driving layer 12 is formed on the substrate 11, and the light emitting layer 14 is formed on a side of the driving layer 12 away from the substrate 11. The substrate 11 and the driving layer 12 are partially located in the display area AA and partially located in the non-display area NA.

[0093] It should be noted that the formation methods of the driving layer 12 , the light emitting layer 14 , the first dam 17 , and the encapsulation layer 15 may refer to the prior art and will not be described in detail.

[0094] Step S02: forming a plurality of refraction blocks and a plurality of second dams simultaneously on one side of the display panel preform.

[0095] The plurality of refraction blocks 161 are disposed corresponding to the light emitting layer 14. A plurality of second dams 18 are disposed in the non-display area NA and surround the display area AA. The second dams 18 are located on a side of the first dam 17 close to the display area AA.

[0096] Optionally, the material of the second dam 18 is the same as that of the refraction block 161 .

[0097] Optionally, the refraction block 161 and the second dam 18 are formed simultaneously by a half-tone mask (HTM) or a gray-tone mask (GTM).

[0098] Step S03: forming a refraction layer on one side of the refraction block.

[0099] The refractive layer 162 and the refractive block 161 cooperate to form the light extraction layer 16, which is used to improve the light extraction efficiency of the light emitting layer 14. A second dam 18 is provided in the non-display area AA, and the second dam 18 is used to prevent the spread of the material in the liquid phase forming the refractive layer 162. The second dam 18 forms the boundary of the refractive layer 162, and prevents the material of the refractive layer 162 from overflowing to the side of the first dam 17 away from the display area AA, and controls the overflow boundary of the liquid phase refractive layer 162 material to be within the first dam 17, that is, the edge of the refractive layer 162 is located on the side of the first dam 17 close to the display area AA, and reduces the overflow area step difference.

[0100] The display panel is prepared by the preparation method provided in the embodiment of the present application. The process of forming the second dam 18 is synchronized with the process of forming the refraction block 161 of the light extraction layer 16, and no new process needs to be introduced. The display panel prepared by the preparation method provided in the embodiment of the present application has at least the same advantages as the display panel provided in the above embodiment.

[0101] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, comprising a display area and a non-display area, characterized in that: include: A light-emitting layer is disposed in the display area; the light-emitting layer includes a plurality of light-emitting elements; A plurality of first dams are disposed in the non-display area and surround the display area; an encapsulation layer, covering the light-emitting layer and the first dam; A light extraction layer is arranged on a side of the encapsulation layer away from the light emitting layer; part of the light extraction layer is arranged in the display area, and part of the light extraction layer is arranged in the non-display area; the light extraction layer comprises a plurality of refraction blocks and a refraction layer; the orthographic projection of the refraction block on the light emitting layer covers the light emitting element; the refraction layer covers the refraction block; A plurality of second dams are arranged in the non-display area and surround the display area; the second dams are arranged on a side of the encapsulation layer away from the light-emitting layer, and the second dams are arranged in the same layer as the refraction block; the second dams are located on a side of the first dams close to the display area; Part of the refractive layer is located in the non-display area, and an edge of the refractive layer is located on a side of the first dam close to the display area.

2. The display panel according to claim 1, characterized in that: The material of the second dam is the same as that of the refraction block.

3. The display panel according to claim 1, characterized in that: The height of the second dam farthest from the display area among the plurality of second dams is greater than the thickness of the edge of the portion of the refractive layer located in the non-display area; and / or the height of the second dam is less than or equal to the thickness of the portion of the refractive layer located in the display area; wherein the thickness of the edge of the portion of the refractive layer located in the non-display area is less than the thickness of the portion of the refractive layer located in the display area.

4. The display panel according to claim 1, characterized in that: The height of the second dam is greater than or equal to the height of the refraction block.

5. The display panel according to claim 1, characterized in that: The display panel includes a plurality of second dams arranged at intervals; the plurality of second dams have the same height; or, along a direction from the display area to the non-display area, the heights of the plurality of second dams gradually increase.

6. The display panel according to claim 1, characterized in that: The surface of the second dam facing away from the light-emitting layer is a curved surface, or the longitudinal section of the second dam is a trapezoid or a rectangle.

7. The display panel according to claim 1, characterized in that: The refraction block and the second dam are formed simultaneously in the same process; Preferably, the refraction block and the second dam are formed simultaneously by a half-tone mask or a gray-scale mask.

8. The display panel according to claim 1, characterized in that: The display panel comprises a plurality of first dams arranged at intervals, and the edge of the refractive layer is located on a side of the first dam closest to the display area among the plurality of first dams and close to the display area; Preferably, the display panel comprises a plurality of second dams arranged at intervals, and the edge of the refractive layer is located on a side of the second dam farthest from the display area among the plurality of second dams close to the display area; Preferably, the encapsulation layer includes two inorganic encapsulation film layers and one organic encapsulation film layer, and the organic encapsulation film layer is arranged between the two inorganic encapsulation film layers; the two inorganic encapsulation film layers respectively cover the light-emitting layer and the first dam; the organic encapsulation film layer covers the light-emitting layer, and the edge of the organic encapsulation film layer extends to the side of the first dam close to the display area.

9. A display device, characterized in that: A display panel comprising any one of claims 1 to 8.

10. A method for preparing a display panel according to any one of claims 1 to 8, wherein the display panel comprises a display area and a non-display area; characterized in that: include: Obtain a display panel preform; wherein the display panel preform comprises a light-emitting layer, a plurality of first dams and an encapsulation layer; the light-emitting layer is arranged in the display area; a plurality of the first dams are arranged in the non-display area and surround the display area; the encapsulation layer covers the light-emitting layer and the first dams; A plurality of refraction blocks and a plurality of second dams are simultaneously formed on one side of the display panel preform; wherein the plurality of refraction blocks are arranged corresponding to the light-emitting layer; a plurality of the second dams are arranged in the non-display area and surround the display area, and the second dams are located on a side of the first dam close to the display area; A refraction layer is formed on one side of the refraction block.

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