Display device, display panel and preparation method thereof

Abstract

The application provides a display device and a display panel thereof. The display panel further comprises a dam structure, which is arranged in a frame area and between a driving structure layer and an encapsulation structure layer. The dam structure comprises a first blocking structure, which has a first blocking part and a second blocking part arranged in a stacking manner from the driving structure layer to the encapsulation structure layer. The part of the second blocking part close to the display area extends out of the top surface of the first blocking part. The part of the second blocking part away from the display area does not exceed the top surface of the first blocking part. The first blocking structure in the dam structure provided by the application does not form a roof structure on the side wall surface away from the display area, thereby avoiding the defects of cracks and empty packages caused by the roof structure of the first blocking structure. By extending the outer side surface of the second blocking part close to the display area out of the top surface of the first blocking part, the edge of the encapsulation structure layer is sealed, and the encapsulation effect of the display panel is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display device, a display panel, and a method for manufacturing the same. Background Technology

[0002] Organic light-emitting diodes (OLEDs) and other light-emitting devices are increasingly widely used in products such as televisions and mobile phones due to their characteristics of being thin, energy-efficient, having a wide color gamut, and high contrast. In the fabrication of OLEDs, an isolation structure between pixels is created through a process route involving the removal of the mask and the creation of a hanging structure, in order to improve the display effect of the pixels. However, when fabricating the thin-film encapsulation blocking structure using this mask-removing hanging structure process, defects such as cracks and voids can easily occur in the lower side area of ​​the eaves structure within the hanging structure, thus affecting subsequent processes. Summary of the Invention

[0003] The main technical problem solved by this invention is to provide a display device, a display panel and a method for manufacturing the same, thereby solving the problem of poor reliability of thin-film encapsulation blocking structures in the prior art.

[0004] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is: to provide a display panel having a display area and a border area located around the display area; the display panel includes a driving structure layer, a pixel limiting layer and an encapsulation structure layer stacked in sequence, and the display panel also includes a dam structure disposed in the border area and between the pixel limiting layer and the encapsulation structure layer;

[0005] The dam structure includes a first blocking structure, which has a first blocking portion and a second blocking portion stacked along the direction from the pixel defining layer to the encapsulation structure layer. The portion of the second blocking portion near the display area extends beyond the top surface of the first blocking portion, while the portion of the second blocking portion away from the display area does not extend beyond the top surface of the first blocking portion.

[0006] The encapsulation structure layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked along a direction away from the pixel limiting layer, wherein the surface of the first inorganic encapsulation layer away from the pixel limiting layer does not exceed the bottom surface of the second blocking portion.

[0007] The surface of the organic encapsulation layer that is away from the pixel defining layer is not lower than the bottom surface of the second blocking portion and not higher than the top surface of the second blocking portion.

[0008] In this embodiment, at least one of the first blocking part and the second blocking part is made of a metallic material, and the material of the first blocking part is different from that of the second blocking part.

[0009] The dam structure further includes a second blocking structure and / or a third blocking structure. The second blocking structure is located on the side of the first blocking structure away from the display area and on the side of the first blocking structure closer to the display area. The second blocking structure includes a third blocking part and a fourth blocking part stacked along the direction from the pixel limiting layer to the encapsulation structure layer. The fourth blocking part completely covers the top surface of the third blocking part, and both sides of the fourth blocking part extend laterally beyond the top surface of the third blocking part. The third blocking structure includes a fifth blocking part and a sixth blocking part stacked along the direction from the pixel limiting layer to the encapsulation structure layer. The sixth blocking part at least partially covers the top surface of the fifth blocking part, and the orthographic projection of the sixth blocking part onto the top surface of the fifth blocking part does not exceed the top surface of the fifth blocking part.

[0010] The border area includes a fan-out area, and the dam structure within the fan-out area includes at least a first blocking structure and a second blocking structure spaced apart from each other; wherein there are at least two second blocking structures within the fan-out area, and adjacent second blocking structures are spaced apart.

[0011] Among them, the dam structure in the border area other than the fan-out area includes at least a first blocking structure and a third blocking structure.

[0012] To solve the above-mentioned technical problems, the second technical solution adopted by the present invention is: to provide a method for manufacturing a display panel, the method comprising:

[0013] Obtain the panel to be processed; the panel to be processed includes a driving structure layer, a pixel limiting layer, a first functional layer, and a second functional layer stacked in sequence; the panel to be processed includes a display area and a border area surrounding the display area;

[0014] The second functional layer and the first functional layer in the border area are removed in sequence to form the first window, and the pixel limiting layer is exposed through the first window; the end of the second functional layer forming the inner wall of the first window does not extend beyond the end of the first functional layer forming the inner wall of the same first window.

[0015] A second window is formed by sequentially removing a portion of the second functional layer and a portion of the first functional layer on the side of the first window closest to the display area, so that the first functional layer and the second functional layer in the border area at least form a first blocking structure; a portion of the pixel limiting layer is exposed through the second window; the end of the second functional layer forming the inner wall of the second window extends out of the end of the first functional layer forming the inner wall of the same second window;

[0016] An encapsulation structure layer is formed on one side of the pixel limiting layer where the first blocking structure is set.

[0017] Specifically, the process of sequentially removing portions of the second functional layer and the first functional layer located within the border area to form the first window includes:

[0018] A first photoresist layer is formed on the surface of the second functional layer away from the first functional layer, and the first photoresist layer completely covers the second functional layer.

[0019] At least one first opening is formed on the first photoresist layer located in the border area; a portion of the second functional layer is exposed through the first opening;

[0020] The portion of the second functional layer and the portion of the first functional layer exposed through the first opening are removed sequentially to form the first window;

[0021] Remove the first photoresist layer;

[0022] The second window is formed by sequentially removing a portion of the second functional layer and a portion of the first functional layer from the side of the first window closest to the display area, including:

[0023] A second photoresist layer is formed on the side of the second functional layer away from the first functional layer, and the second photoresist layer fills the first window and covers the second functional layer.

[0024] At least one second opening is formed on the second photoresist layer in the region of the first window near the display area; a portion of the second functional layer is exposed through the second opening;

[0025] The second functional layer and the first functional layer exposed through the second opening are removed in sequence to form the second window;

[0026] Remove the second photoresist layer.

[0027] To solve the above-mentioned technical problems, the third technical solution adopted by the present invention is to provide a display device, including the display panel in the first technical solution.

[0028] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention provides a display device, a display panel, and a method for manufacturing the same, comprising a display area and a border area surrounding the display area; the display panel includes a driving structure layer, a pixel defining layer, and an encapsulation structure layer stacked sequentially; the display panel also includes a dam structure disposed in the border area and between the pixel defining layer and the encapsulation structure layer; the dam structure includes a first blocking structure, which has a first blocking portion and a second blocking portion stacked along the direction from the pixel defining layer to the encapsulation structure layer; the portion of the second blocking portion near the display area extends beyond the top surface of the first blocking portion; the portion of the second blocking portion away from the display area does not extend beyond the top surface of the first blocking portion. The first blocking structure in the dam structure provided in this application sets the portion of the second blocking part away from the display area to not exceed the top surface of the first blocking part, so that the side wall surface of the first blocking structure away from the display area does not form an eaves structure, thereby avoiding defects such as cracks and voids caused by the eaves structure in the first blocking structure; by extending the portion of the second blocking part near the display area out of the top surface of the first blocking part, the side wall surface of the first blocking structure near the display area forms an eaves structure, so as to facilitate the sealing of the encapsulation structure layer, improve the encapsulation effect of the display panel, and thus improve the reliability of the display panel. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0030] Figure 1 This is a schematic diagram of the planar structure of a display panel provided by a technical solution in the prior art;

[0031] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the display panel along the AA direction provided in the embodiment;

[0032] Figure 3(a) is a schematic cross-sectional view of the barrier structure covering the first inorganic encapsulation layer in the prior art;

[0033] Figure 3(b) is a schematic cross-sectional view of the barrier structure covering the second inorganic encapsulation layer in the prior art;

[0034] Figure 4 This is a cross-sectional structural diagram of the display panel provided in the first embodiment of this application;

[0035] Figure 5 This is a cross-sectional structural schematic diagram of the dam structure provided in the second embodiment of this application;

[0036] Figure 6 This is a cross-sectional structural schematic diagram of the dam structure provided in the third embodiment of this application;

[0037] Figure 7 This is a cross-sectional structural schematic diagram of the dam structure provided in the fourth embodiment of this application;

[0038] Figure 8 This is a cross-sectional structural schematic diagram of the dam structure provided in the fifth embodiment of this application;

[0039] Figure 9 This is a cross-sectional structural schematic diagram of the dam structure provided in the sixth embodiment of this application;

[0040] Figure 10 yes Figure 4 A schematic diagram of the planar structure of the display panel provided in the embodiment;

[0041] Figure 11 This is a schematic diagram of the planar structure of the display panel provided in the first embodiment of this application;

[0042] Figure 12 This is a schematic diagram of the planar structure of the display panel provided in the second embodiment of this application;

[0043] Figure 13 This is a schematic diagram of the planar structure of the display panel provided in the third embodiment of this application;

[0044] Figure 14 This is a schematic flowchart of the method for manufacturing the display panel provided in this application;

[0045] Figures 15(a) to 15(g) yes Figure 14 A cross-sectional schematic diagram of the dam structure corresponding to each step in the fabrication method of the display panel;

[0046] Figure 16 This is a schematic diagram of the structure of a display device provided in an embodiment of this application.

[0047] In the figure: display device 100; display panel 10; display area 1; bezel area 2; fan-out area 20; driving structure layer 11; substrate 111; driving substrate 112; connecting electrode 12; pixel limiting layer 13; conductive isolation structure 14; conductive structure 141; roof structure 142; encapsulation structure layer 15; first inorganic encapsulation layer 151; organic encapsulation layer 152; second inorganic encapsulation layer 153; barrier structure 16; main body structure 161; top surface structure 162; empty package 17. Dam structure 18; first blocking structure 181; first blocking part 181a; second blocking part 181b; second blocking structure 182; third blocking part 182a; fourth blocking part 182b; third blocking structure 183; fifth blocking part 183a; sixth blocking part 183b; panel to be processed 3; first functional layer 31; second functional layer 32; first photoresist layer 4; first opening 41; first window 42; second photoresist layer 5; second opening 51; second window 52. Detailed Implementation

[0048] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] In the following description, specific details such as particular system architectures, interfaces, and technologies are set forth for illustrative purposes and not for limiting purposes, in order to provide a thorough understanding of the invention.

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0051] The terms "first," "second," and "third" used in this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this invention are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. 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 may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0052] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] Please see Figures 1 to 3(b) , Figure 1 This is a schematic diagram of the planar structure of a display panel provided by a technical solution in the prior art; Figure 2 yes Figure 1 The embodiment provides a schematic cross-sectional view of the display panel along the AA direction; Figure 3(a) is a schematic cross-sectional view of the barrier structure after covering the first inorganic encapsulation layer in the prior art; Figure 3(b) is a schematic cross-sectional view of the barrier structure after covering the second inorganic encapsulation layer in the prior art.

[0054] Currently, when fabricating thin-film encapsulation directly through the process line of the overhanging structure without a mask, defects such as cracks and voids (17) are prone to occur in the lower side area of ​​the eaves structure in the overhanging structure. Specifically, in the direction perpendicular to the display panel 10, the display panel 10 includes a driving structure layer 11, a pixel defining layer 13, and an encapsulation structure layer 15 stacked sequentially. The display panel 10 also includes a dam structure 18, which is disposed in the border area 2 and between the driving structure layer 11 and the encapsulation structure layer 15. The dam structure 18 includes multiple blocking structures 16, each including a main structure 161 and a top surface structure 162 stacked along the direction from the driving structure layer 11 to the encapsulation structure layer 15, with the edge of the top surface structure 162 extending beyond the top surface of the main structure 161. The encapsulation structure layer 15 includes a first inorganic encapsulation layer 151, an organic encapsulation layer 152, and a second inorganic encapsulation layer 153 stacked along the direction away from the driving structure layer 11. The organic encapsulation layer 152 is an inkjet printing layer (IJP), and the barrier structure 16 is used to prevent the organic encapsulation layer 152 from leveling. The first inorganic encapsulation layer 151 and the second inorganic encapsulation layer 153 are stacked on the exposed drive structure layer 11 and the outer wall of the barrier structure 16. Because the edge of the top structure 162 in the barrier structure 16 extends beyond the top surface of the main structure 161 to form an eaves structure, the second inorganic encapsulation layer 153 at the end of the extended top structure 162 can easily connect with the second inorganic encapsulation layer 153 on the drive structure layer 11, forming a void 17 between the outer surface of the main structure 161, the lower surface of the extended top structure 162, and the upper surface of the drive structure layer 11. When the display panel 10 is heated, the thermal expansion and contraction of the air inside the void 17 can easily cause cracks in the second inorganic encapsulation layer 153, affecting the encapsulation performance of the encapsulation structure layer 15.

[0055] Furthermore, when other circuit layers need to be set on the encapsulation structure layer 15 of the display panel 10, the unstable structure of the encapsulation structure layer 15 may easily lead to the risk of disconnection of other circuit layers laid on the encapsulation structure layer 15.

[0056] Please see Figures 4 to 10 , Figure 4 This is a cross-sectional structural diagram of the display panel provided in the first embodiment of this application; Figure 5 This is a cross-sectional structural schematic diagram of the dam structure provided in the second embodiment of this application; Figure 6 This is a cross-sectional structural schematic diagram of the dam structure provided in the third embodiment of this application; Figure 7 This is a cross-sectional structural schematic diagram of the dam structure provided in the fourth embodiment of this application; Figure 8 This is a cross-sectional structural schematic diagram of the dam structure provided in the fifth embodiment of this application; Figure 9 This is a cross-sectional structural schematic diagram of the dam structure provided in the sixth embodiment of this application; Figure 10 yes Figure 4 A schematic diagram of the planar structure of the display panel provided in the embodiment.

[0057] Based on the above issues, please refer to Figure 4 This application provides a display panel 10, which has a display area 1 and a border area 2 located around the display area 1. The display panel 10 includes a driving structure layer 11, a pixel defining layer 13, and an encapsulation structure layer 15 stacked sequentially. The display panel 10 also includes a dam structure 18, which is disposed in the border area 2 and between the driving structure layer 11 and the encapsulation structure layer 15. The dam structure 18 includes a first blocking structure 181, which has a first blocking portion 181a and a second blocking portion 181b stacked along the direction from the driving structure layer 11 to the encapsulation structure layer 15. The portion of the second blocking portion 181b near the display area 1 extends beyond the top surface of the first blocking portion 181a, and the portion of the second blocking portion 181b away from the display area 1 does not extend beyond the top surface of the first blocking portion 181a.

[0058] The first blocking structure 181 in the dam structure 18 provided in this application sets the outer side of the second blocking part 181b away from the display area 1 to not exceed the top surface of the first blocking part 181a, so that no eaves structure is formed on the side wall of the first blocking structure 181 away from the display area 1, thereby avoiding defects such as cracks and voids 17 caused by the eaves structure in the first blocking structure 181; by extending the part of the second blocking part 181b near the display area 1 out of the top surface of the first blocking part 181a, the side wall of the first blocking structure 181 near the display area 1 forms an eaves structure, so as to seal the edge of the encapsulation structure layer 15 and improve the encapsulation effect of the display panel 10.

[0059] The display panel 10 also includes connecting electrodes 12 and conductive isolation structures 14. The driving structure layer 11 includes a substrate 111 and a driving substrate 112 stacked sequentially. A pixel defining layer 13 is disposed on the side of the driving substrate 112 away from the substrate 111. The connecting electrodes 12 are disposed between the pixel defining layer 13 and the driving substrate 112, and are spaced apart from each other. The pixel defining layer 13 has multiple spaced-apart windows, each window exposing one connecting electrode 12. The conductive isolation structure 14 includes a conductive structure 141 disposed on the pixel limiting layer 13 and a roof structure 142 disposed on the conductive structure 141. The orthographic projection of the conductive structure 141 on the driving substrate 112 at least partially overlaps with the orthographic projection of the connecting electrode 12 on the driving substrate 112. The pixel limiting layer 13 located in the overlapping area has a plurality of conductive vias. The conductive structure 141 is connected to the connecting electrode 12 through the conductive vias. The connecting electrode 12 is electrically connected to the power supply traces on the driving substrate 112 through the vias. The conductive structure 141 is electrically coupled to the cathode of the display area 1, thereby realizing the signal connection between the cathode and the signal traces.

[0060] In one embodiment, the encapsulation structure layer 15 is disposed on the side of the roof structure 142 away from the driving substrate 112. The encapsulation structure layer 15 includes a first inorganic encapsulation layer 151, an organic encapsulation layer 152, and a second inorganic encapsulation layer 153 stacked in a direction away from the driving structure layer 11.

[0061] The first inorganic encapsulation layer 151 extends away from the display area 1 to the frame area 2 and covers the exposed surface of the dam structure 18. The organic encapsulation layer 152 extends away from the display area 1 to the frame area 2, and the first barrier structure 181 interrupts the leveling of the organic encapsulation layer 152, reducing the risk of the organic encapsulation layer 152 leveling to the outside of the frame area 2. The second inorganic encapsulation layer 153 extends away from the display area 1 to the frame area 2 and covers both the exposed organic encapsulation layer 152 and the exposed first inorganic encapsulation layer 151.

[0062] In one embodiment, the first blocking structure 181 is disposed on the side surface of the pixel limiting layer 13 away from the driving substrate 112, that is, the first blocking structure 181 is disposed between the pixel limiting layer 13 and the first inorganic encapsulation layer 151. The cross-sectional shape of the first blocking portion 181a in the first blocking structure 181 in the first direction includes, but is not limited to, a rectangle, a trapezoid, an inverted trapezoid, etc. The bottom surface of the first blocking portion 181a does not extend beyond the top surface of the pixel limiting layer 13. The first direction is perpendicular to the display panel 10. In one embodiment, the outer side of the first blocking portion 181a away from the display area 1 is a plane with a first tilt angle. The first tilt angle is the angle between the outer side of the first blocking portion 181a away from the display area 1 and the plane in the first direction, and the range of the first tilt angle is [0°, 90°]. In one embodiment, the range of the first tilt angle is [30°, 60°]. The first tilt angle can also be 40°, 45°, or 50°, etc.

[0063] In one embodiment, the second blocking portion 181b extends beyond the top surface of the first blocking portion 181a near the outer side of the display area 1. That is, the orthographic projection of the bottom surface of the second blocking portion 181b near the edge of the display area 1 onto the driving structure layer 11 exceeds the orthographic projection of the top surface of the first blocking portion 181a onto the driving structure layer 11. The outer side of the second blocking portion 181b away from the display area 1 does not extend beyond the top surface of the first blocking portion 181a. That is, the orthographic projection of the bottom surface of the second blocking portion 181b away from the edge of the display area 1 onto the driving structure layer 11 does not exceed the orthographic projection of the top surface of the first blocking portion 181a onto the driving structure layer 11.

[0064] The outer surface of the second blocking portion 181b away from the display area 1 is a plane with a second tilt angle. The second tilt angle is the angle between the outer surface of the second blocking portion 181b away from the display area 1 and the plane in the first direction, and the range of the second tilt angle is [0°, 90°]. In one embodiment, the range of the first tilt angle is [30°, 60°]. The first tilt angle can also be 40°, 45°, or 50°, etc. The first tilt angle may or may not be the same as the second tilt angle, depending on the actual situation.

[0065] In one specific embodiment, the distance between the orthographic projection of the bottom surface of the second blocking portion 181b away from the outer edge of the display area 1 onto the top surface of the first blocking portion 181a and the outer edge of the first blocking portion 181a away from the display area 1 is not zero. That is, the top surface of the first blocking portion 181a extends beyond the bottom surface of the second blocking portion 181b on the side away from the display area 1. The outer side of the second blocking portion 181b away from the display area 1, a portion of the top surface of the first blocking portion 181a, and the outer side of the first blocking portion 181a away from the display area 1 cooperate to form a stepped structure.

[0066] In one specific embodiment, such as Figures 5 to 9 In order to reduce the step formed between the first blocking part 181a and the second blocking part 181b, simplify the connection structure of the first blocking part 181a and the second blocking part 181b, and reduce the probability of cracks appearing in the encapsulation structure layer 15 provided at the connection of the first blocking part 181a and the second blocking part 181b, the bottom surface of the second blocking part 181b away from the edge of the display area 1 is aligned with the top surface of the first blocking part 181a away from the edge of the display area 1.

[0067] Specifically, the cross-sectional shape of the second blocking part 181b in the first blocking structure 181 in the first direction can be a rectangle, a right trapezoid, an isosceles trapezoid, or the like.

[0068] In one embodiment, to reduce the probability of voids 17 forming on the outer side of the first blocking structure 181 near the display area 1, the surface of the first inorganic encapsulation layer 151 away from the driving structure layer 11 does not exceed the bottom surface of the second blocking portion 181b. In a specific embodiment, the surface of the first inorganic encapsulation layer 151 away from the driving structure layer 11 is lower than the bottom surface of the second blocking portion 181b, so that the organic encapsulation layer 152 with leveling properties can fill the groove formed by the second blocking portion 181b, the first blocking portion 181a, and the driving structure layer 11 in the first blocking structure 181, thereby reducing the probability of voids 17 forming in the groove and improving the encapsulation performance of the display panel 10.

[0069] In one embodiment, to facilitate the filling of the groove formed by the second blocking portion 181b, the first blocking portion 181a, and the driving structure layer 11 in the first blocking structure 181 by the organic encapsulation layer 152 with leveling properties, and to reduce the probability of empty packages 17 forming in the groove, the surface of the second inorganic encapsulation layer 153 away from the driving structure layer 11 is not lower than the bottom surface of the second blocking portion 181b. To reduce the overflow of the organic encapsulation layer 152 with leveling properties to the side of the first blocking structure 181 away from the display area 1, the surface of the organic encapsulation layer 152 away from the driving structure layer 11 is not higher than the top surface of the second blocking portion 181b.

[0070] In one embodiment, at least one of the first blocking portion 181a and the second blocking portion 181b is a metallic material, and the material of the first blocking portion 181a is different from the material of the second blocking portion 181b. For example, the materials of the first blocking portion 181a and the second blocking portion 181b can be different metals. In a specific embodiment, the material of the first blocking portion 181a can be copper, etc.; the material of the second blocking portion 181b can be aluminum, etc.; in another embodiment, one of the first blocking portion 181a and the second blocking portion 181b is a metal, and the other is an insulating material. The metal includes, but is not limited to, copper, aluminum, etc.; the insulating material includes, but is not limited to, polyimide, etc.

[0071] In one embodiment, there may be one or more first blocking structures 181. When there are multiple first blocking structures 181, they are spaced apart from each other.

[0072] In one embodiment, the dam structure 18 further includes a second blocking structure 182 and / or a third blocking structure 183. The second blocking structure 182 and the third blocking structure 183 are respectively spaced apart from the first blocking structure 181. The second blocking structure 182 is located on the side of the first blocking structure 181 away from the display area 1, and the third blocking structure 183 is located on the side of the first blocking structure 181 closer to the display area 1. Figures 5 to 8 Because the second blocking structure 182 and the first blocking structure 181 are spaced apart, the first blocking structure 181 and the second blocking structure 182 cooperate with the first inorganic encapsulation layer 151 to form a receiving groove. The second blocking part 181b can further block the organic encapsulation layer 152 that overflows through the first blocking structure 181 through the receiving groove, preventing the organic encapsulation layer 152 from overflowing to the outside of the display panel 10. The third blocking structure 183 can slow down the flow rate of the organic encapsulation layer 152.

[0073] In one embodiment, the second blocking structure 182 has a third blocking portion 182a and a fourth blocking portion 182b stacked along the direction from the driving structure layer 11 to the encapsulation structure layer 15, wherein at least the portion of the third blocking portion 182a away from the display area 1 does not extend beyond the top surface of the fourth blocking portion 182b.

[0074] In one specific embodiment, to facilitate the fabrication of the second blocking structure 182, the structure, material, and shape of the third blocking part 182a are consistent with the structure, material, and shape of the first blocking part 181a; the structure, material, and shape of the fourth blocking part 182b are consistent with the structure, material, and shape of the second blocking part 181b, such as... Figure 5 .

[0075] In one specific embodiment, in order to improve the encapsulation effect of the encapsulation structure layer 15, the second barrier structure 182 may only include the third barrier portion 182a, such as... Figure 7 and 9 .

[0076] The structure, material, and shape of the second blocking structure 182 may also differ from those of the first blocking structure 181.

[0077] In one specific embodiment, since less organic encapsulation material overflows into the receiving groove, in order to reduce the probability of cracks appearing in the encapsulation structure layer 15 at the connection between the third blocking portion 182a and the fourth blocking portion 182b near the side wall of the display area 1, the portion of the fourth blocking portion 182b near the display area 1 can be configured not to extend beyond the top surface of the third blocking portion 182a, such as... Figure 6 That is, the orthographic projection of the bottom surface of the fourth blocking part 182b near the edge of the display area 1 onto the driving structure layer 11 does not exceed the orthographic projection of the top surface of the third blocking part 182a onto the driving structure layer 11. The portion of the fourth blocking part 182b away from the display area 1 does not extend beyond the top surface of the third blocking part 182a. That is, the orthographic projection of the bottom surface of the fourth blocking part 182b away from the edge of the display area 1 onto the driving structure layer 11 does not exceed the orthographic projection of the top surface of the third blocking part 182a onto the driving structure layer 11.

[0078] Specifically, the cross-sectional shape of the third blocking part 182a and / or the fourth blocking part 182b in the second blocking structure 182 in the first direction can be a rectangle, a right trapezoid, an scalene trapezoid, or an isosceles trapezoid, etc. In this embodiment, to facilitate the fabrication of the cross-sectional shape of the third blocking part 182a and the fourth blocking part 182b in the first direction, both are isosceles trapezoids. The area of ​​the top surface of the third blocking part 182a is equal to the area of ​​the bottom surface of the fourth blocking part 182b, and the edge of the third blocking part 182a is aligned with the edge of the bottom surface of the fourth blocking part 182b. The outer side of the third blocking part 182a away from the display area 1 and the outer side of the fourth blocking part 182b away from the display area 1 are on the same plane, and the outer side of the third blocking part 182a near the display area 1 and the outer side of the fourth blocking part 182b near the display area 1 are on the same plane. In another embodiment, the inclination angle of the outer side of the third blocking part 182a near the display area 1 and / or away from the display area 1 can be smaller than the inclination angle of the corresponding outer side of the fourth blocking part 182b. The tilt angle of the outer side of the third blocking part 182a that is close to and / or far from the display area 1 may be greater than the tilt angle of the corresponding outer side of the fourth blocking part 182b.

[0079] In one embodiment, the third blocking structure 183 has a fifth blocking portion 183a and a sixth blocking portion 183b stacked along the direction from the driving structure layer 11 to the encapsulation structure layer 15. At least the portion of the sixth blocking portion 183b near the display area 1 extends beyond the top surface of the fifth blocking portion 183a, so that the connection between the fifth blocking portion 183a and the sixth blocking portion 183b forms an eaves structure to slow down the flow rate of the organic encapsulation layer 152.

[0080] In one specific embodiment, since the third blocking structure 183 is disposed on the side of the first blocking structure 181 near the display area 1, the organic encapsulation layer 152 can overflow from the side of the third blocking structure 183 near the display area 1 to the side of the third blocking structure 183 away from the display area 1. Therefore, when the top surface of the sixth blocking portion 183b extends away from the display area 1 and the surface of the organic encapsulation layer 152 away from the driving structure layer 11 is not lower than the bottom surface of the sixth blocking portion 183b, the organic encapsulation layer 152 can fill the groove formed between the bottom surface of the sixth blocking portion 183b away from the display area 1, the outer surface of the fifth blocking portion 183a away from the display area 1, and the driving structure layer 11, thereby preventing the formation of an empty package 17 at the groove formed between the bottom surface of the sixth blocking portion 183b away from the display area 1, the outer surface of the fifth blocking portion 183a away from the display area 1, and the driving structure layer 11.

[0081] In one specific embodiment, for ease of manufacturing, the shape, structure, and material of the third blocking structure 183 may also be consistent with those of the first blocking structure 181.

[0082] The third blocking structure 183 can be one or more. When there are multiple third blocking structures 183, adjacent third blocking structures 183 are spaced apart.

[0083] In one embodiment, the bezel area 2 further includes a fan-out area 20, which is connected to the display area 1 and includes multiple data fan-out lines. These data fan-out lines are configured to connect to the data signal lines (DataLines) of the display area 1 in a fan-out routing manner. The fan-out area 20 occupies a large space, resulting in a larger width on one side of the bezel area 2 of the display panel 10 where the fan-out area 20 is located. The bezel area 2 is rectangular and includes a top border, a bottom border, a left border, and a right border, with the bottom border serving as the fan-out area 20.

[0084] In one embodiment, the dam structure 18 within the fan-out area 20 includes at least a first blocking structure 181 and a second blocking structure 182.

[0085] Please see Figures 11 to 13 , Figure 11 This is a schematic diagram of the planar structure of the display panel provided in the first embodiment of this application; Figure 12 This is a schematic diagram of the planar structure of the display panel provided in the second embodiment of this application; Figure 13 This is a schematic diagram of the planar structure of the display panel provided in the third embodiment of this application.

[0086] In one specific embodiment, please refer to Figure 11Since the fan-out area 20 includes multiple data fan-out lines, the data fan-out lines transmit the signal of the display area 1 to the outside of the frame area 2. In order not to increase the difficulty of crossing the data fan-out lines in the fan-out area 20, and at the same time improve the packaging reliability of the display panel 10, a first blocking structure 181, a second blocking structure 182 and a third blocking structure 183 are provided on the upper frame, left frame and right frame of the frame area 2, and only the first blocking structure 181 and the second blocking structure 182 are provided on the lower frame of the frame area 2.

[0087] In one embodiment, there are at least two second blocking structures 182, with adjacent second blocking structures 182 spaced apart.

[0088] In one specific embodiment, please refer to Figure 12 To further enhance the encapsulation capability of the bottom border without increasing the difficulty of crossing lines, a first blocking structure 181, a second blocking structure 182, and a third blocking structure 183 are set on the top border, left border, and right border of the border area 2. Only the first blocking structure 181 and the second blocking structure 182 are set on the bottom border of the border area 2, and there are two first blocking structures 181.

[0089] In one embodiment, the dam structure 18 in the border area 2, excluding the fan-out area 20, includes at least a first blocking structure 181 and a third blocking structure 183.

[0090] In one specific embodiment, please refer to Figure 13 Since only the bottom border has data fan-out lines, in order to increase the encapsulation capability of the bottom border, a first blocking structure 181 and a third blocking structure 183 are set in the top border, left border and right border of border area 2, and a second blocking structure 182 and a third blocking structure 183 are set in the bottom border of border area 2.

[0091] In one embodiment, this application provides a method for manufacturing a display panel 10, which includes the following specific implementation. The display panel 10 obtained by this method is the display panel 10 in the above embodiment. In the following embodiment, in order to reduce the manufacturing process, the first blocking structure 181, the second blocking structure 182, and the third blocking structure 183 are disposed in the same layer, and the first blocking portion 181a, the third blocking portion 182a, and the fifth blocking portion 183a are made of the same material, and the second blocking portion 181b, the fourth blocking portion 182b, and the sixth blocking portion 183b are made of the same material.

[0092] Please see Figure 14 as well as Figures 15(a) to 15(e) , Figure 14 This is a schematic flowchart of the method for manufacturing the display panel provided in this application; Figures 15(a) to 15(e) yes Figure 14A cross-sectional schematic diagram of the dam structure corresponding to each step in the fabrication method of the display panel.

[0093] S1: Obtain the panel to be processed; the panel to be processed includes a driving structure layer, a pixel limiting layer, a first functional layer, and a second functional layer stacked in sequence; the panel to be processed includes a display area and a border area surrounding the display area.

[0094] Specifically, a driving substrate 112 is covered on one side surface of the substrate 111 to form a driving structure layer 11. A metal layer is covered on the side of the driving substrate 112 away from the substrate 111, and the metal layer is etched to obtain a plurality of spaced-apart connection electrodes 12. A pixel defining layer 13 is formed on the side surface of the connection electrodes 12 away from the driving structure layer 11, and a plurality of windows are formed on the pixel defining layer 13, each window exposing a connection electrode 12. A first functional layer 31 and a second functional layer 32 are stacked on the pixel defining layer 13 to form a panel to be processed 3, as shown in FIG15(a). The panel to be processed 3 includes a display area 1 and a border area 2 surrounding the display area 1.

[0095] The materials of the first functional layer 31 and the second functional layer 32 can be the same or different. The materials of the first functional layer 31 and the second functional layer 32 can be metal or insulating layers, depending on the actual situation.

[0096] In the following embodiments, the following detailed description is provided, assuming that both the first functional layer 31 and the second functional layer 32 are metals. The materials of the first functional layer 31 and the second functional layer 32 are different. For example, the first functional layer 31 is copper, and the second functional layer 32 is aluminum.

[0097] S2: The second functional layer and the first functional layer in the border area are removed in sequence to form a first window, and the pixel limiting layer is exposed through the first window; the end of the second functional layer forming the inner wall of the first window does not exceed the end of the first functional layer forming the inner wall of the same first window.

[0098] Specifically, a first photoresist layer 4 is formed on the surface of the second functional layer 32 away from the first functional layer 31, completely covering the second functional layer 32. At least one first opening 41 is formed on the first photoresist layer 4 located in the border region 2 by exposure and development. Part of the second functional layer 32 is exposed through the first opening 41, as shown in FIG15(b). The exposed part of the second functional layer 32 and part of the first functional layer 31 are removed sequentially by wet etching to form a first window 42, as shown in FIG15(b). The first photoresist layer 4 is then removed, as shown in FIG15(d).

[0099] The above steps can be used to obtain either the second blocking structure 182 or the outer side of the first blocking structure 181 away from the display area 1.

[0100] S3: Sequentially remove a portion of the second functional layer and a portion of the first functional layer on the side of the first window closest to the display area to form a second window, so that the first functional layer and the second functional layer in the border area at least form a first blocking structure; a portion of the pixel limiting layer is exposed through the second window; the end of the second functional layer forming the inner wall of the second window extends out of the end of the first functional layer forming the inner wall of the same second window.

[0101] Specifically, a second photoresist layer 5 is formed on the side of the second functional layer 32 away from the first functional layer 31. The second photoresist layer 5 fills the first window 42 and covers the second functional layer 32. At least one second opening 51 is formed on the second photoresist layer 5 in the area of ​​the first window 42 near the display area 1 by exposure and development, as shown in FIG15(e). Part of the second functional layer 32 is exposed through the second opening 51. The part of the second functional layer 32 exposed through the second opening 51 and part of the first functional layer 31 are removed sequentially by exposure and development to form the second window 52, ​​as shown in FIG15(f). The second photoresist layer 5 is then removed, as shown in FIG15(g).

[0102] Through the above steps, any one of the following can be formed in the border area 2: the third blocking structure 183, the outer side of the first blocking structure 181 near the display area 1, and the conductive isolation structure 14 in the display area 1.

[0103] S4: An encapsulation structure layer is formed on the side where the first blocking structure is set in the pixel limiting layer.

[0104] Specifically, a first inorganic encapsulation layer 151 is formed on one side surface of the pixel limiting layer 13 where the first blocking structure 181, the second blocking structure 182, and the third blocking structure 183 are disposed, using chemical vapor deposition. An organic encapsulation material is then deposited on the surface of the first inorganic encapsulation layer 151 within the display area 1 using inkjet printing. This organic encapsulation material is fluid; it flows from the display area 1 to the border area 2, first reaching the third blocking structure 183, where its flow rate is slowed, allowing further flow to the first blocking structure 181. If the organic encapsulation material overflows to the side of the first blocking structure 181 away from the display area 1, the second blocking structure 182 again blocks it, thus forming an organic encapsulation layer 152 on the side surface of the first inorganic encapsulation layer 151 away from the pixel limiting layer 13. A second inorganic encapsulation layer 153 is then formed on the side surface of the organic encapsulation layer 152 away from the pixel limiting layer 13 using chemical vapor deposition. Through these steps, an encapsulation structure layer 15 is obtained, as shown below. Figure 4 .

[0105] In one embodiment, a metal layer is formed on the side of the encapsulation structure layer 15 away from the driving structure layer 11 by means of spraying or the like, and the metal layer is patterned to obtain a circuit layer, as shown in FIG3.

[0106] Please see Figure 16 , Figure 16 This is a schematic diagram of the structure of a display device 100 provided in an embodiment of this application.

[0107] In this embodiment, a display device 100 is provided, which can be used in tablets, mobile phones, vehicles, lighting and other fields.

[0108] The display device 100 includes a display panel 10. The specific structure and function of the display panel 10 are the same as or similar to those of the display panel 10 in the above embodiment, and can achieve the same technical effect. For details, please refer to the above detailed description, which will not be repeated here.

[0109] The display panel 10 in the display device 100 adopts the display panel 10 in the above embodiment. The first blocking structure 181 in the dam structure 18 is configured such that the part of the second blocking part 181b away from the display area 1 does not exceed the top surface of the first blocking part 181a, so that the side wall surface of the first blocking structure 181 away from the display area 1 does not form an eaves structure, thereby avoiding defects such as cracks and voids 17 caused by the eaves structure of the first blocking structure 181. The part of the second blocking part 181b near the display area 1 extends out of the top surface of the first blocking part 181a, so that the side wall surface of the first blocking structure 181 near the display area 1 forms an eaves structure, so as to seal the edge of the encapsulation structure layer 15 and improve the encapsulation effect of the display panel 10.

[0110] The above are merely embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A display panel having a display area and a border area surrounding the display area; the display panel comprising a driving structure layer, a pixel defining layer, and an encapsulation structure layer stacked sequentially, the display panel further comprising a dam structure disposed in the border area and between the pixel defining layer and the encapsulation structure layer; characterized in that, The dam structure includes a first blocking structure, the first blocking structure having a first blocking portion and a second blocking portion stacked along the direction from the pixel defining layer to the encapsulation structure layer, the portion of the second blocking portion near the display area extending beyond the top surface of the first blocking portion; the portion of the second blocking portion away from the display area does not extend beyond the top surface of the first blocking portion. The encapsulation structure layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked along a direction away from the pixel limiting layer, wherein the surface of the first inorganic encapsulation layer away from the pixel limiting layer does not exceed the bottom surface of the second blocking portion; The surface of the organic encapsulation layer away from the pixel defining layer is not lower than the bottom surface of the second blocking portion and not higher than the top surface of the second blocking portion.

2. The display panel according to claim 1, characterized in that, At least one of the first blocking part and the second blocking part is made of a metallic material, and the material of the first blocking part is different from the material of the second blocking part.

3. The display panel according to claim 1 or 2, characterized in that, The dam structure further includes a second blocking structure and / or a third blocking structure. The second blocking structure is disposed on the side of the first blocking structure away from the display area, and the third blocking structure is disposed on the side of the first blocking structure close to the display area. The second blocking structure includes a third blocking portion and a fourth blocking portion stacked along the direction from the pixel limiting layer to the encapsulation structure layer. The fourth blocking portion completely covers the top surface of the third blocking portion, and both sides of the fourth blocking portion extend laterally beyond the top surface of the third blocking portion. The third blocking structure includes a fifth blocking portion and a sixth blocking portion stacked along the direction from the pixel limiting layer to the encapsulation structure layer. The sixth blocking portion at least partially covers the top surface of the fifth blocking portion, and the orthographic projection of the sixth blocking portion onto the top surface of the fifth blocking portion does not exceed the top surface of the fifth blocking portion.

4. The display panel according to claim 3, characterized in that, The border area includes a fan-out area, and the dam structure within the fan-out area includes at least two mutually spaced first and second blocking structures; wherein, there are at least two second blocking structures within the fan-out area, and adjacent second blocking structures are spaced apart.

5. The display panel according to claim 4, characterized in that, The dam structure in the border area, excluding the fan-out area, includes at least the first blocking structure and the third blocking structure.

6. A method for manufacturing a display panel, characterized in that, The method for manufacturing the display panel includes: Obtain the panel to be processed; the panel to be processed includes a driving structure layer, a pixel limiting layer, a first functional layer, and a second functional layer stacked in sequence; the panel to be processed includes a display area and a border area surrounding the display area; The second functional layer and the first functional layer located in the border area are sequentially removed to form a first window, and a portion of the pixel limiting layer is exposed through the first window; the end of the second functional layer forming the inner wall of the first window does not extend beyond the end of the first functional layer forming the inner wall of the same first window; A second window is formed by sequentially removing a portion of the second functional layer and a portion of the first functional layer on the side of the first window closest to the display area, so that the first functional layer and the second functional layer in the border area at least form a first blocking structure; the portion of the pixel limiting layer is exposed through the second window; the end of the second functional layer forming the inner wall of the second window extends beyond the end of the first functional layer forming the inner wall of the same second window; An encapsulation structure layer is formed on the side of the pixel limiting layer where the first blocking structure is disposed; The first blocking structure has a first blocking portion and a second blocking portion stacked along the direction from the pixel limiting layer to the encapsulation structure layer; the encapsulation structure layer includes a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer stacked along the direction away from the pixel limiting layer, wherein the surface of the first inorganic encapsulation layer away from the pixel limiting layer does not exceed the bottom surface of the second blocking portion, and the surface of the organic encapsulation layer away from the pixel limiting layer is not lower than the bottom surface of the second blocking portion and not higher than the top surface of the second blocking portion.

7. The method for manufacturing a display panel according to claim 6, characterized in that, The step of sequentially removing a portion of the second functional layer and a portion of the first functional layer located in the border area to form the first window includes: A first photoresist layer is formed on the surface of the second functional layer away from the first functional layer, and the first photoresist layer completely covers the second functional layer. At least one first opening is formed on the first photoresist layer located in the border region; a portion of the second functional layer is exposed through the first opening; The portion of the second functional layer and the portion of the first functional layer exposed through the first opening are removed sequentially to form the first window; Remove the first photoresist layer; The step of sequentially removing a portion of the second functional layer and a portion of the first functional layer from the side of the first window closest to the display area to form the second window includes: A second photoresist layer is formed on the side of the second functional layer away from the first functional layer, and the second photoresist layer fills the first window and covers the second functional layer. At least one second opening is formed on the second photoresist layer in the region of the first window near the display area; a portion of the second functional layer is exposed through the second opening; The portion of the second functional layer and the portion of the first functional layer exposed through the second opening are removed sequentially to form the second window; Remove the second photoresist layer.

8. A display device, characterized in that, Includes the display panel as described in any one of claims 1-5.

Images