Display panel, its manufacturing method and display device

Abstract

This invention provides a display panel, its manufacturing method, and a display device. The display panel includes a substrate and a plurality of sub-pixels disposed on the substrate. Each sub-pixel includes a light-emitting layer. The plurality of sub-pixels includes at least adjacent first and second sub-pixels. The light-emitting layer of the first sub-pixel includes a first compensation layer and a first photoexcitation layer stacked together. The light-emitting layer of the second sub-pixel includes a second compensation layer and a second photoexcitation layer stacked together. A barrier layer is disposed between the first and second compensation layers. The barrier layer is used to block at least a portion of the current transmitted between the first and second sub-pixels. The solution of this invention can improve the lateral crosstalk problem and enhance the display performance of the display panel.

Description

Technical Field

[0001] This invention relates to a display panel, its manufacturing method, and a display device, belonging to the field of display technology. Background Technology

[0002] OLED (Organic Light-Emitting Diode) has a series of advantages such as self-illumination, wide viewing angle, light weight, thinness, high brightness, low power consumption and fast response. Therefore, OLED display panels have become very popular display devices at home and abroad, with broad application prospects.

[0003] However, in most OLED display panels currently available, when a single subpixel emits light, lateral crosstalk is prone to occur, which can cause adjacent subpixels to also emit light in severe cases, thus affecting display performance. Summary of the Invention

[0004] This invention provides a display panel, its manufacturing method, and a display device to solve the problem of lateral crosstalk that easily occurs in OLED display panels.

[0005] In a first aspect, embodiments of the present invention provide a display panel, which includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein each of the plurality of sub-pixels includes a light-emitting layer;

[0006] The plurality of sub-pixels includes at least an adjacent first sub-pixel and a second sub-pixel; the light-emitting layer of the first sub-pixel includes a first compensation layer and a first photoexcitation layer stacked together; the light-emitting layer of the second sub-pixel includes a second compensation layer and a second photoexcitation layer stacked together.

[0007] A barrier layer is provided between the first compensation layer and the second compensation layer; the barrier layer is used to block at least a portion of the current transmitted between the first sub-pixel and the second sub-pixel.

[0008] Based on the above display panel, optionally, the plurality of sub-pixels further includes a third sub-pixel, the light-emitting layer of the third sub-pixel includes a third compensation layer and a third photoexcitation layer stacked together, and the carrier transport capability of the material of the third compensation layer is less than the carrier transport capability of the materials of the first compensation layer and the second compensation layer; the material of the barrier layer is the same as the material of the third compensation layer.

[0009] Optionally, the first sub-pixel is a green sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a blue sub-pixel.

[0010] Based on the above display panel, optionally, the barrier layer and the third compensation layer are continuous film layers.

[0011] Based on the above display panel, optionally, the thickness of the barrier layer is less than 100 angstroms.

[0012] Based on the above display panel, optionally, the orthographic projection of the barrier layer on the substrate covers at least the portion of the orthographic projection of the light-emitting layer of the first sub-pixel on the substrate that is close to the second sub-pixel, and / or at least covers the portion of the orthographic projection of the light-emitting layer of the second sub-pixel on the substrate that is close to the first sub-pixel.

[0013] Secondly, embodiments of the present invention also provide a display device, which includes the display panel described in any of the above-mentioned claims.

[0014] Thirdly, embodiments of the present invention also provide a method for manufacturing a display panel, comprising:

[0015] A first compensation layer and a first photoexcitation layer are sequentially formed within the pixel region corresponding to the first sub-pixel;

[0016] A barrier layer is formed on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel; wherein the barrier layer on the first photoexcitation layer and the barrier layer in the pixel region corresponding to the second sub-pixel are continuous film layers.

[0017] A second compensation layer and a second photoexcitation layer are sequentially formed on the barrier layer within the pixel region corresponding to the second sub-pixel.

[0018] Based on the above preparation method, optionally, while forming a barrier layer on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel, a barrier layer is also formed in the pixel region corresponding to the third sub-pixel; the barrier layer on the first photoexcitation layer, the barrier layer in the pixel region corresponding to the second sub-pixel, and the barrier layer in the pixel region corresponding to the third sub-pixel are continuous film layers; and the carrier transport capability of the material of the third compensation layer of the third sub-pixel is less than the carrier transport capability of the materials of the first compensation layer and the second compensation layer; the material of the barrier layer is the same as the material of the third compensation layer of the third sub-pixel;

[0019] After forming a continuous barrier layer on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel, the method further includes:

[0020] A third photoexcitation layer is formed on the barrier layer within the pixel region corresponding to the third sub-pixel.

[0021] Based on the above preparation method, optionally, before sequentially forming the first compensation layer and the first photoexcitation layer in the pixel region corresponding to the first sub-pixel, the method further includes:

[0022] A third compensation layer and a third photoexcitation layer are formed sequentially within the pixel region corresponding to the third sub-pixel.

[0023] The display panel, its manufacturing method, and display device provided by this invention include a substrate and a plurality of sub-pixels disposed on the substrate. Each sub-pixel includes a light-emitting layer. The plurality of sub-pixels includes at least an adjacent first sub-pixel and a second sub-pixel. The light-emitting layer of the first sub-pixel includes a first compensation layer and a first photoexcitation layer stacked together. The light-emitting layer of the second sub-pixel includes a second compensation layer and a second photoexcitation layer stacked together. A barrier layer is disposed between the first compensation layer and the second compensation layer. The barrier layer is used to block at least a portion of the current transmitted between the first sub-pixel and the second sub-pixel. Thus, by adding a barrier layer between the first and second compensation layers of the first and second sub-pixels, at least a portion of the current transmitted between the first and second sub-pixels through the compensation layer can be blocked, i.e., the transmission path of lateral current is blocked, thereby effectively improving the lateral crosstalk problem between adjacent sub-pixels. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the concept of the invention to those skilled in the art by reference to specific embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of an existing display panel;

[0026] Figure 2 A schematic diagram illustrating the structure for creating an overlap of the light-emitting layers of adjacent sub-pixels in an existing display panel;

[0027] Figure 3 This is a schematic diagram of the structure of a display panel provided in one embodiment of the present invention;

[0028] Figure 4 for Figure 3 A schematic diagram of a structure at the light-emitting layer of an adjacent sub-pixel of the display panel shown.

[0029] Figure 5 for Figure 3 Another structural diagram of the light-emitting layer of adjacent sub-pixels in the display panel shown;

[0030] Figure 6 for Figure 3 The diagram shows another structural schematic of the light-emitting layer of adjacent sub-pixels in the display panel.

[0031] Figure 7 for Figure 3The diagram shows another structural schematic of the light-emitting layer of adjacent sub-pixels in the display panel.

[0032] Figure 8 This is a schematic diagram of the structure of the light-emitting layer of an adjacent sub-pixel of a display panel provided in another embodiment of the present invention;

[0033] Figure 9 A schematic flowchart illustrating a method for manufacturing a display panel according to an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of a display device provided in one embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Sub-pixel; 11-Anode; 12-Hole injection layer; 13-Hole transport layer; 14-Emitting layer; 141-Photoexcitation layer; 142-Compensation layer; 15-Hole blocking layer; 16-Electron injection layer; 17-Cathode;

[0037] 2-First sub-pixel; 21-First compensation layer; 22-First photoexcitation layer; 3-Second sub-pixel; 31-Second compensation layer; 32-Second photoexcitation layer; 41-Third compensation layer; 42-Third photoexcitation layer; 50-Barrier layer; 60-Substrate; 70-Pixel definition layer. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] Application Overview

[0040] In OLED display panels, full-color display is commonly achieved using sub-pixels of the three primary colors (RGB). However, due to the different characteristics of the light-emitting materials in RGB sub-pixels, they have different driving voltages. This results in a potential difference between the RGB pixels in the display panel at low grayscale levels. Consequently, when a single sub-pixel emits light, the current of that emitting sub-pixel is transmitted to adjacent sub-pixels, causing lateral crosstalk. In severe cases, this can cause adjacent sub-pixels to also emit light, thus affecting the display effect.

[0041] like Figure 1As shown, in a common display panel, each sub-pixel 1 includes an anode 11, a hole injection layer 12, a hole transport layer 13, a light-emitting layer 14, a hole blocking layer 15, an electron injection layer 16, and a cathode 17, which are stacked sequentially. When a driving voltage is applied to the sub-pixel 1, holes generated by the anode 11 pass through the hole injection layer 12 and the hole transport layer 13 to reach the light-emitting layer 14, while electrons generated by the cathode 17 pass through the electron injection layer 16 and the hole blocking layer 15 to reach the light-emitting layer 14. Holes and electrons recombine in the light-emitting layer 14, thereby exciting the light-emitting material in the light-emitting layer 14 to emit light. The light-emitting layer 14 includes a photoexcitation layer 142 near the cathode 17 and a compensation layer 141 near the anode 11. The photoexcitation layer 141 contains light-emitting material for emitting light upon excitation after hole and electron recombination, while the compensation layer 142 is used to adjust the energy level and to form an optical microcavity.

[0042] Based on the above-mentioned display panel, the inventors of this invention discovered after research that the lateral crosstalk of the current has two paths: one path is through the hole injection layer 12 (and / or hole transport layer 13) between different sub-pixels 1; the second path is through the compensation layer 142 between adjacent pixels.

[0043] Among them, such as Figure 1 As shown, the main factor causing lateral crosstalk along the first path is that the hole injection layer 12 (and hole transport layer 13) between different sub-pixels 1 are common layers. That is, since the hole injection layer 12 (and hole transport layer 13) between different sub-pixels 1 are interconnected, when there is a voltage difference between adjacent sub-pixels 1, the current can be transverse laterally in the hole injection layer 12 (and hole transport layer 13) between different sub-pixels 1.

[0044] Regarding the lateral crosstalk along the second path, the inventors discovered the following reasons after research: Since the materials of the photoexcitation layer 141 and compensation layer 142 of different sub-pixels 1 are different, different sub-pixels 1 need to be formed sequentially by vapor deposition in a certain order. Ideally, the photoexcitation layer 141 between adjacent sub-pixels 1 needs to be completely separated, and the compensation layer 142 between adjacent sub-pixels 1 also needs to be completely separated. However, since the spacing between adjacent sub-pixels 1 is very small, and the vapor deposition accuracy in the actual process is limited by the mask, it is difficult to ensure that the compensation layer 142 between all adjacent sub-pixels 1 is completely separated in the actual structure. Instead, it is as follows: Figure 2 As shown, there is a certain degree of overlap between the compensation layers 142 of some adjacent sub-pixels 1. Based on this, a small amount of current can be transmitted laterally in the compensation layers 142 that overlap between different sub-pixels 1.

[0045] For the lateral crosstalk of the first path, the current main solution is to cut off the hole injection layer 12 and hole transport layer 13 of the adjacent sub-pixel 1 through additional processes (such as plasma bombardment) after forming the hole injection layer 12 and hole transport layer 13, thereby cutting off the lateral transport path of the current.

[0046] However, there is currently no good solution for the lateral crosstalk of the second path. Therefore, this invention provides a feasible solution to improve the lateral crosstalk problem. The following examples and embodiments illustrate the specific implementation scheme in a non-limiting manner.

[0047] Exemplary display panel

[0048] Reference Figure 3-7 , Figure 3 This is a schematic diagram of the structure of a display panel provided in one embodiment of the present invention. Figure 4-7 They are respectively Figure 3 This is a schematic diagram of a structure at the light-emitting layer 14 of an adjacent sub-pixel 1 in the display panel shown. Figure 3 As shown, the display panel includes a substrate 60 and a plurality of sub-pixels 1 disposed on the substrate 60. Figure 3 (Only two are shown in the image); each sub-pixel 1 includes an anode 11, a cathode 17, and a light-emitting layer 14 disposed between the anode 11 and the cathode 17; multiple sub-pixels 1 include at least adjacent first sub-pixels 2 and second sub-pixels 3. (See image for details.) Figure 4-7 As shown, the light-emitting layer 14 of the first sub-pixel 2 includes a first compensation layer 21 and a first photoexcitation layer 22 stacked together; the light-emitting layer 14 of the second sub-pixel 3 includes a second compensation layer 31 and a second photoexcitation layer 32 stacked together; and a barrier layer 50 is disposed between the first compensation layer 21 and the second compensation layer 31; the barrier layer 50 is used to block at least part of the current transmitted between the first sub-pixel 2 and the second sub-pixel 3.

[0049] First, it should be noted that, unless otherwise specified, "multiple" in each embodiment of the present invention refers to at least two. Furthermore, the substrate 60 can be a rigid substrate such as a glass substrate or a silicon substrate, or a flexible substrate such as stainless steel (SUS) or flexible polyimide (PI). That is to say, the display panel in the embodiments of the present invention can be a rigid display panel that cannot be bent, or a flexible display panel that can be bent.

[0050] In the above scheme, by setting the barrier layer 50, even if a certain degree of overlap occurs between the first compensation layer 21 and the second compensation layer 31 due to factors such as deposition precision during the vapor deposition process, the overlapping first compensation layer 21 and the second compensation layer 31 will be blocked by the barrier layer 50, thus preventing current from being effectively transmitted between the first compensation layer 21 and the second compensation layer 31. Therefore, the problem of lateral crosstalk can be improved.

[0051] Furthermore, in some embodiments, the orthogonal projection of the barrier layer 50 onto the substrate 60 at least covers the portion of the orthogonal projection of the light-emitting layer 14 of the first sub-pixel 2 onto the substrate 60 near the second sub-pixel 3, and / or at least covers the portion of the orthogonal projection of the light-emitting layer 14 of the second sub-pixel 3 onto the substrate 60 near the first sub-pixel 2. In this way, the barrier layer 50 can block the current between the first compensation layer 21 and the second compensation layer 31, thereby improving the lateral crosstalk problem. Here, the portion of the light-emitting layer 14 of the first sub-pixel 2 near the second sub-pixel 3 refers to the portion where the light-emitting layer 14 of the first sub-pixel 2 may overlap with the light-emitting layer 14 of the second sub-pixel 3; similarly, the portion of the light-emitting layer 14 of the second sub-pixel 3 near the first sub-pixel 2 refers to the portion where the light-emitting layer 14 of the second sub-pixel 3 may overlap with the light-emitting layer 14 of the first sub-pixel 2.

[0052] Preferably, the orthographic projection of the barrier layer 50 onto the substrate 60 covers the orthographic projections of all sub-pixels of the display panel onto the substrate 60. Thus, in actual manufacturing, the barrier layer 50 can be formed directly at the corresponding positions of all sub-pixels in a single process. This configuration simplifies the manufacturing process.

[0053] Specifically, in order to make the structure of the barrier layer 50 more intuitive and easier to understand, the following examples illustrate the feasible structures of the barrier layer 50 with reference to the accompanying drawings.

[0054] In some embodiments, such as Figure 4 As shown, the barrier layer 50 may only cover the possible overlapping portions of the first compensation layer 21 and the second compensation layer 31. For example, the barrier layer 50 may be entirely located within the pixel definition layer 70 used to separate adjacent sub-pixels 1 (the position of the pixel definition layer 70 can be referenced). Figure 1 (as shown) at the top.

[0055] In other embodiments, such as Figure 5 and 6 As shown, in Figure 4 Based on this, the barrier layer 50 may further include a portion located on one sidewall of the pixel definition layer 70, or, as... Figure 7 As shown, in Figure 4 In addition, the barrier layer 50 may also include portions located on the two sidewalls of the pixel definition layer 70.

[0056] All the solutions in the above embodiments can block the current between the first compensation layer 21 and the second compensation layer 31 through the barrier layer 50, and can be selected according to actual needs.

[0057] Based on the above scheme, in one embodiment, the plurality of sub-pixels 1 further includes a third sub-pixel. The light-emitting layer 14 of the third sub-pixel includes a third compensation layer and a third photoexcitation layer stacked together. The carrier transport capability of the material of the third compensation layer is less than that of the materials of the first compensation layer 21 and the second compensation layer 31. The material of the barrier layer 50 is the same as that of the third compensation layer.

[0058] In other words, in this embodiment, if the display panel includes at least three different sub-pixels, the barrier layer 50 can be formed using the material of the compensation layer with the lowest carrier transport capability among the different sub-pixels. Since the barrier layer 50 is formed of a material capable of transporting carriers, holes generated by the anode 11 can pass through the barrier layer 50 located on the side of the second compensation layer 31 away from the second photoexcitation layer 32, thereby reaching the second compensation layer 31 and the second photoexcitation layer 32. This ensures that the second sub-pixel 3 can normally achieve its light-emitting function. Simultaneously, because the barrier layer 50 has a low carrier transport capability, it can also block the transmission of a portion of the lateral current between the first compensation layer 21 and the second compensation layer 31 to a certain extent. Since sub-pixel 1 can only emit light when the current and voltage reach a certain threshold, when a portion of the lateral current between the first compensation layer 21 and the second compensation layer 31 is blocked, the actual laterally transportable current is insufficient to meet the light-emitting requirements of adjacent sub-pixels 1. Therefore, adjacent sub-pixels will not emit light, thus not affecting display performance.

[0059] Furthermore, in some embodiments, the first sub-pixel 2 is a green sub-pixel, the second sub-pixel 3 is a red sub-pixel, and the third sub-pixel is a blue sub-pixel.

[0060] Specifically, due to the limitations of current light-emitting materials, in current OLED display panels, red and green subpixels are more susceptible to abnormal light emission due to lateral crosstalk compared to blue subpixels. That is, the compensation layer in the light-emitting layer of red and green subpixels has a relatively better capacity for transporting charge carriers, while the compensation layer in the light-emitting layer of blue subpixels has a relatively weaker capacity. Based on this, when the display panel is implemented using RGB three-primary-color subpixels 1, the material of the compensation layer in the light-emitting layer of the blue subpixel can be used to form the barrier layer 50.

[0061] In some embodiments, such as Figure 8As shown, if the material of the barrier layer 50 is the same as that of the third compensation layer, the barrier layer 50 can be a continuous film with the third compensation layer 41. Thus, in the actual fabrication process, the barrier layer 50 and the third compensation layer 41 can be formed using the same process steps, thereby simplifying the process and making it easier to implement.

[0062] Of course, it is understandable that the barrier layer 50 and the third compensation layer may not be continuous film layers. Although this will increase the complexity of the process, it can still improve the problem of lateral crosstalk.

[0063] In some embodiments, if the material of the barrier layer 50 is the same as the material of the third compensation layer, then the thickness of the barrier layer 50 is less than [the required thickness]. Specifically, since the carrier transport capability of the material in the third compensation layer is relatively low, when the material of the third compensation layer is used to form the barrier layer 50, the thickness of the barrier layer 50 should not be too large to avoid excessive blocking of holes when they pass through the barrier layer 50, which is located on the side of the second compensation layer 31 away from the second photoexcitation layer 32. Based on the currently used materials, the thickness of the barrier layer 50 should be less than 100 angstroms to improve the lateral crosstalk problem while avoiding affecting the normal light emission of sub-pixel 1.

[0064] In addition, it should be noted that, Figure 3 In the display panel shown, each sub-pixel 1 includes only an anode 11, a light-emitting layer 14, and a cathode 17. However, in some embodiments of the present invention, each sub-pixel may also include one or more of the following structures: a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer, etc.

[0065] Furthermore, in practice, a circuit array layer is also present between the substrate 60 and the sub-pixel. This circuit array layer includes multiple driving circuits, each of which includes a driving transistor. The drain of the driving transistor is electrically connected to the anode 11 of the sub-pixel 1 to transmit a driving signal to the anode 11. It is understood that the cathode 17 of each sub-pixel is grounded or connected to a low-level signal to create a voltage difference between the anode 11 and the cathode 17 that drives the light-emitting layer 14 to emit light.

[0066] Exemplary preparation method

[0067] Reference Figure 9 , Figure 9 This is a schematic flowchart illustrating a method for manufacturing a display panel according to an embodiment of the present invention. Figure 9 As shown, this embodiment of the invention provides a method for manufacturing a display panel, comprising:

[0068] Step S101: A first compensation layer and a first photoexcitation layer are formed sequentially in the pixel region corresponding to the first sub-pixel.

[0069] Specifically, pixel regions corresponding to different sub-pixels are defined by pixel definition layers. Adjacent pixel definition layers have pixel openings, and the region corresponding to these pixel openings is also a pixel region. Pixel definition layers can be obtained by first fabricating a full-layer insulating layer on a substrate and then etching the insulating layer. This is existing technology and will not be described in detail here.

[0070] The first compensation layer and the first photoexcitation layer can be obtained by vapor deposition using a fine metal mask (FMM).

[0071] Step S102: A barrier layer is formed on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel. The barrier layer on the first photoexcitation layer and the barrier layer in the pixel region corresponding to the second sub-pixel are continuous films.

[0072] Specifically, the barrier layer can also be obtained by vapor deposition using a specific photomask. Furthermore, a portion of the barrier layer is formed on the first photoexcitation layer, while another portion is formed within the pixel region of the second sub-pixel, and the two portions of the barrier layer form a continuous film.

[0073] Step S103: A second compensation layer and a second photoexcitation layer are sequentially formed on the barrier layer in the pixel region corresponding to the second sub-pixel.

[0074] That is, the second compensation layer and the second photoexcitation layer are formed on the side of the barrier layer away from the substrate. Since the first compensation layer and the first photoexcitation layer are located on the side of the barrier layer closer to the substrate, even if the second compensation layer overlaps with the first compensation layer (and / or the first photoexcitation layer) to a certain extent during its formation, the first and second compensation layers at the overlap will be separated by the barrier layer, thereby blocking at least a portion of the lateral current that may exist at the first and second compensation layers, thus improving the lateral crosstalk problem.

[0075] In some embodiments, based on the above steps, the method for manufacturing the display panel further includes:

[0076] While forming a barrier layer on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel, a barrier layer is also formed in the pixel region corresponding to the third sub-pixel; the barrier layer on the first photoexcitation layer, the barrier layer in the pixel region corresponding to the second sub-pixel, and the barrier layer in the pixel region corresponding to the third sub-pixel are continuous film layers; and the carrier transport capability of the material of the third compensation layer of the third sub-pixel is less than the carrier transport capability of the materials of the first compensation layer and the second compensation layer; the material of the barrier layer is the same as the material of the third compensation layer of the third sub-pixel.

[0077] Accordingly, after step S102, the method for fabricating the display panel further includes: forming a third photoexcitation layer on a barrier layer in the pixel region corresponding to the third sub-pixel.

[0078] Specifically, in this embodiment, if the carrier transport capability of the material of the third compensation layer of the third sub-pixel is less than that of the materials of the first compensation layer and the second compensation layer, then the material of the third compensation layer can be used to form a barrier layer. Furthermore, after forming continuous barrier layers, the barrier layer located within the pixel region of the third sub-pixel can serve as the third compensation layer of the third sub-pixel. This configuration simplifies the fabrication process while improving the lateral crosstalk problem.

[0079] The step of forming the third photoexcitation layer can be performed before or after step S103, and has no substantial impact on the final display panel, so it is not restricted.

[0080] To facilitate better understanding, the following example is provided: In this example, the first sub-pixel is green, the second sub-pixel is red, and the third sub-pixel is blue. Due to the limitations of current material properties, the carrier transport capacity of the compensation layer material in the light-emitting layer of the blue sub-pixel is relatively lower than that of the green and red sub-pixels. Therefore, the material of the compensation layer corresponding to the blue sub-pixel is used as the material for the barrier layer. The vapor deposition process for fabricating each sub-pixel is as follows:

[0081] ① A compensation layer and a photoexcitation layer for the green sub-pixel are formed at the pixel opening position corresponding to the green sub-pixel using an open-film mirror (FMM). ② A common barrier layer is deposited using a common mask. The barrier layer is formed both inside the pixel openings and on top of the pixel definition layer. ③ A photoexcitation layer for the blue sub-pixel is formed at the pixel opening position corresponding to the blue sub-pixel using an FMM. ④ A compensation layer and a photoexcitation layer for the red sub-pixel are formed at the pixel opening position corresponding to the red sub-pixel using an FMM. Steps ③ and ④ can be interchanged. That is, the three colors of sub-pixels can be formed sequentially in the order of green, blue, and red sub-pixels, or vice versa.

[0082] The above method can obtain a common barrier layer for all sub-pixels, which is simple to manufacture and can effectively improve the lateral crosstalk problem.

[0083] In other embodiments, based on the above steps S101-S103, before step S101, the method for preparing the display panel further includes: sequentially forming a third compensation layer and a third photoexcitation layer in the pixel region corresponding to the third sub-pixel.

[0084] Specifically, the third compensation layer and the third photoexcitation layer are the light-emitting layers of the third sub-pixel. Furthermore, unlike the previous embodiments, where the first sub-pixel is green, the second sub-pixel is red, and the third sub-pixel is blue, in this embodiment, the order in which the three sub-pixels are formed is: blue sub-pixel, green sub-pixel, and red sub-pixel. Moreover, the compensation layer of the blue sub-pixel (third sub-pixel) does not need to be a continuous film layer with the barrier layer. This fabrication process can also effectively improve the lateral crosstalk problem. Another advantage is that in existing conventional methods, the three sub-pixels are generally fabricated in the order of blue, green, and red sub-pixels; therefore, the changes to the existing fabrication process are minimal when using the scheme of this embodiment.

[0085] The structure of each layer of the display panel prepared by the above method, as well as the corresponding descriptions and materials, can be found in the description of the "Exemplary Display Panel" and will not be repeated here.

[0086] Exemplary display device

[0087] This invention also provides a display device, which includes the display panel described in any of the above embodiments. For example... Figure 10 As shown, Figure 10 This is a schematic diagram of a display device provided in one embodiment of the present invention. The display device can be a smartphone, tablet computer, digital camera, etc.

[0088] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched regions shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0089] Unless otherwise defined, the technical or scientific terms used in the embodiments of this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to avoid confusion of the constituent elements.

[0090] Unless the context otherwise requires, throughout this specification, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of this specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

Claims

1. A display panel, characterized in that, It includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein each of the plurality of sub-pixels includes a light-emitting layer; The plurality of sub-pixels includes at least an adjacent first sub-pixel and a second sub-pixel; the light-emitting layer of the first sub-pixel includes a first compensation layer and a first photoexcitation layer stacked together; the light-emitting layer of the second sub-pixel includes a second compensation layer and a second photoexcitation layer stacked together. A barrier layer is disposed between the first compensation layer and the second compensation layer; the barrier layer is used to block at least a portion of the current transmitted between the first sub-pixel and the second sub-pixel; The plurality of sub-pixels also includes a third sub-pixel. The light-emitting layer of the third sub-pixel includes a third compensation layer and a third photoexcitation layer stacked together. The carrier transport capability of the material of the third compensation layer is less than that of the materials of the first compensation layer and the second compensation layer. The material of the barrier layer is the same as that of the third compensation layer. The barrier layer and the third compensation layer are continuous film layers. The first sub-pixel is a green sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a blue sub-pixel.

2. The display panel according to claim 1, characterized in that, The thickness of the barrier layer is less than 100 angstroms.

3. The display panel according to claim 1, characterized in that, The orthogonal projection of the barrier layer on the substrate at least covers the portion of the orthogonal projection of the light-emitting layer of the first sub-pixel on the substrate near the second sub-pixel, and / or at least covers the portion of the orthogonal projection of the light-emitting layer of the second sub-pixel on the substrate near the first sub-pixel.

4. The display panel according to claim 3, characterized in that, The orthographic projection of the barrier layer on the substrate covers the orthographic projection of all sub-pixels of the display panel on the substrate.

5. A display device, characterized in that, Includes the display panel as described in any one of claims 1-4.

6. A method for manufacturing a display panel, characterized in that, include: A first compensation layer and a first photoexcitation layer are sequentially formed within the pixel region corresponding to the first sub-pixel; A barrier layer is formed on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel; wherein the barrier layer on the first photoexcitation layer and the barrier layer in the pixel region corresponding to the second sub-pixel are continuous film layers. A second compensation layer and a second photoexcitation layer are sequentially formed on the barrier layer within the pixel region corresponding to the second sub-pixel; The method further includes: A barrier layer is formed on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel, while a barrier layer is formed in the pixel region corresponding to the third sub-pixel; the barrier layer on the first photoexcitation layer, the barrier layer in the pixel region corresponding to the second sub-pixel, and the barrier layer in the pixel region corresponding to the third sub-pixel are continuous film layers; and the carrier transport capability of the material of the third compensation layer of the third sub-pixel is less than that of the materials of the first compensation layer and the second compensation layer; the material of the barrier layer is the same as the material of the third compensation layer of the third sub-pixel, and the barrier layer and the third compensation layer are continuous film layers; the first sub-pixel is a green sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a blue sub-pixel.

7. The preparation method according to claim 6, characterized in that, After forming a continuous barrier layer on the first photoexcitation layer and in the pixel region corresponding to the second sub-pixel, the method further includes: A third photoexcitation layer is formed on the barrier layer within the pixel region corresponding to the third sub-pixel.

8. The preparation method according to claim 6, characterized in that, Before sequentially forming the first compensation layer and the first photoexcitation layer in the pixel region corresponding to the first sub-pixel, the method further includes: A third compensation layer and a third photoexcitation layer are formed sequentially within the pixel region corresponding to the third sub-pixel.

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