Mask assembly for display screen coating, coating process, display screen and electronic device

Abstract

The present disclosure relates to a mask assembly for display screen coating, a coating process, a display screen and an electronic device, and relates to the technical field of display. The mask assembly comprises a first mask and a second mask. The first mask is provided with a plurality of first coating areas arranged in an array. The second mask is provided with a plurality of second coating area groups arranged in an array. The first coating areas are arranged correspondingly with the second coating area groups. Each first coating area comprises a middle area and an edge area. When the first mask and the second mask are arranged in a stack, the middle area is shielded by the second mask, and the edge area is exposed by the second coating area group. The mask assembly of the present disclosure is used to form a coating layer on the display screen. The middle area and the edge area of the coating layer have the same thickness, which can effectively solve the problem of color difference at the edge of the display screen.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to mask assemblies for display screen coating, coating processes, displays, and electronic devices. Background Technology

[0002] In the production of LED or OLED screens, chemical vapor deposition (CVD) is used for coating. Due to the inherent characteristics of the CVD process, uneven coating thickness can easily occur, leading to color variations at the edges of the display screen and affecting the user experience. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides a mask assembly for display screen coating, a coating process, a display screen, and an electronic device.

[0004] The first aspect of this disclosure provides a mask assembly for coating a display screen, the mask assembly including a first mask and a second mask, the first mask having a plurality of first coating areas arranged in an array, and the second mask having a plurality of groups of second coating areas arranged in an array, the first coating areas and the second coating area groups being correspondingly arranged;

[0005] Each of the first coating areas includes a central region and an edge region. When the first mask and the second mask are stacked, the central region is blocked by the second mask, and the edge region is exposed by the second coating area group.

[0006] In some embodiments of this disclosure, the first coating region has a first direction and a second direction, and there is a preset angle between the first direction and the second direction;

[0007] Each group of the second coating area includes a first edge area and / or a second edge area, wherein the first edge area extends along the first direction and the second edge area extends along the second direction.

[0008] In some embodiments of this disclosure, along the first direction, the length of the first edge region is equal to the length of the first coated region; and / or,

[0009] Along the second direction, the size of the first edge region is 10% to 15% of the size of the first coated region.

[0010] In some embodiments of this disclosure, along the second direction, the length of the second edge region is equal to the length of the first coating region; and / or,

[0011] Along the first direction, the size of the second edge region is 4% to 8% of the size of the first coated region.

[0012] In some embodiments of this disclosure, the first mask and the second mask have the same thickness.

[0013] A second aspect of this disclosure provides a coating process for a display screen, the coating process comprising:

[0014] A first mask is applied to the display screen, wherein the first mask has a plurality of first coating areas arranged in an array, each first coating area including a middle area and an edge area;

[0015] A first film layer is formed in the first coating area;

[0016] A second mask is applied to the display screen, wherein the second mask has multiple sets of second coating areas arranged in an array, the first coating area is correspondingly arranged with the second coating area group, and the second coating area group exposes the edge area corresponding to the first film layer;

[0017] A second film layer is formed in the second coating area group;

[0018] The first film layer and the second film layer are integrated to form a coating layer.

[0019] In some embodiments of this disclosure, the thickness of the second film layer is 5% to 10% of the thickness of the first film layer.

[0020] In some embodiments of this disclosure, the coating process further includes:

[0021] After the first film layer is formed, before covering the second mask on the display screen, the first mask is removed; and / or,

[0022] After the second film layer is formed, the second mask is removed.

[0023] In some embodiments of this disclosure, forming a first film layer in the first coating region includes:

[0024] The first film layer is formed in the first coating area using chemical vapor deposition.

[0025] And / or,

[0026] The formation of the second film layer in the second coating area group includes:

[0027] The second film layer is formed in the second coating area using chemical vapor deposition.

[0028] The third aspect of this disclosure provides a display screen, wherein the display screen is encapsulated by forming a coating layer using the coating process of the display screen proposed in the second aspect of this disclosure.

[0029] This disclosure provides a fourth aspect of an electronic device, which includes the display screen proposed in the third aspect of this disclosure.

[0030] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0031] This disclosure utilizes a first mask and a second mask to form a coating layer on the display screen, ensuring that the thickness of the coating layer formed on the display screen is consistent in the middle and edge portions. This results in a uniform display effect of the coating layer during the display process, leading to better visual effects, improved customer satisfaction, and enhanced overall reliability and aesthetics of the display screen.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of a first mask according to an exemplary embodiment.

[0035] Figure 2 This is a schematic diagram of a second mask according to an exemplary embodiment.

[0036] Figure 3 This is a schematic diagram of a second mask according to an exemplary embodiment.

[0037] Figure 4 This is a schematic diagram of a second mask according to an exemplary embodiment.

[0038] Figure 5 This is a process flow diagram illustrating the coating process of a display screen according to an exemplary embodiment. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0040] In related technologies, chemical vapor deposition (CVD) is used for coating in the production of LED or OLED screens. Due to the inherent characteristics of the CVD process, the resulting coating layer can easily have thickness variations. For example, during the coating layer formation process, the thickness difference between the edge and center areas creates a step-like barrier, meaning the center area of ​​the coating layer is thicker than the edge area. This step-like barrier alters the optical refractive index during display, causing edge color distortion issues on the screen.

[0041] To address the aforementioned technical problems, this disclosure proposes a mask assembly for display screen coating. The mask assembly includes a first mask and a second mask. The first mask has multiple first coating areas arranged in an array, and the second mask has multiple groups of second coating areas arranged in an array. The first coating areas and the second coating area groups are correspondingly arranged. Each first coating area includes a central region and an edge region. When the first mask and the second mask are stacked, the central region is blocked by the second mask, and the edge region of the second coating area group is exposed. When using the mask assembly of this disclosure to coat a display screen, the thickness of the coating layer formed on the display screen is consistent in the central and edge portions. The display effect of the coating layer is uniform during the display process, solving the problem of color difference at the edges of the display screen and improving the overall reliability and aesthetics of the display screen.

[0042] According to an exemplary embodiment, such as Figures 1-4 As shown, this embodiment proposes a mask assembly for display screen coating, applied in the production and processing of display screens, which can be used in electronic devices such as mobile phones, tablets, televisions, and computers. The mask assembly includes a first mask 10 and a second mask 20. In this embodiment, the first mask 10 and the second mask 20 have the same thickness, or the thicknesses of the first mask 10 and the second mask 20 are different. The first mask 10 includes multiple first coating areas 1, each first coating area 1 being a first cutout pattern formed on the first mask 10. The multiple first coating areas 1 are spaced apart. The first mask 10 is used to form a first film layer on the display screen through the multiple first coating areas 1. Each first coating area 1 corresponds to one display screen, thereby enabling the processing of multiple display screens in a single process, improving processing efficiency.

[0043] The second mask 20 includes a plurality of second coating area groups 2, each second coating area group 2 including a plurality of second cutout patterns formed on the second mask 20. The plurality of second coating area groups 2 are correspondingly arranged with a plurality of first coating areas 1, that is, each first coating area 1 corresponds to a group of second coating area groups 2. During the process of forming a coating layer using the second mask 20, each group of second coating area groups 2 forms a second film layer on each display screen. In one example, such as... Figures 1-4As shown, multiple first coating areas 1 and multiple second coating area groups 2 are respectively arrayed on the first mask 10 and the second mask 20. The first coating area 1 also includes a middle area 11 and an edge area 12. When the first mask 10 and the second mask 20 are stacked, the multiple first coating areas 1 correspond one-to-one with the multiple second coating area groups 2. The second mask 20 blocks the middle area 11 of the first coating area 1, and the second coating area group 2 exposes the edge area 12 of the first coating area 1. That is, the second film layer formed by the second coating area group 2 corresponds to the thinner edge area of ​​the first film layer 10.

[0044] In this embodiment, the patterns of the first coating area 1 and the second coating area group 2 are not limited, but the structures of the first coating area 1 and the second coating area group 2 can be limited according to the actual product process requirements.

[0045] In one example, such as Figure 1 As shown, the first coating area 1 is a rectangular pattern formed on the first mask 10, such as... Figures 2-3 As shown, the second coating area group 2 consists of multiple strip patterns formed on the second mask 20. The materials of the first mask 10 and the second mask 20 can be selected from nanoscale materials, or combinations of one or more of latex, metals (such as chromium and silicon), and metal oxides (such as iron oxide). It should be noted that the materials used for the first mask 10 and the second mask 20 need to have a certain degree of stability; the materials used must not react with the materials in the display screen, and they must also be easily removable from the display; for example, a metal mesh can be used.

[0046] This embodiment does not limit the order in which the first mask 10 and the second mask 20 are deposited on the display screen. In some embodiments, a first film layer is first formed on the display screen using the first mask 10, and then a second film layer is formed on the display screen using the second mask 20. The second film layer is located on the first film layer and at the edge region of the first film layer. The second film layer is used to supplement the thinner edge region of the first film layer to make the overall thickness of the formed coating layer uniform. In other embodiments, a second film layer is first formed on the display screen using the second mask 20, and then a first film layer is formed on the display screen using the first mask 10. The first film layer is located on the second film layer, and the second film layer corresponds to the edge portion of the first film layer.

[0047] In this embodiment, a first mask and a second mask are used to coat the display screen. Due to the limitations of the coating process, the first film layer formed by the first mask on the display screen has a situation where it is thicker in the middle and thinner at the edges. At this time, a second film layer is formed on the display screen using the second mask, and the second film layer corresponds to the thinner edge part of the first film layer to compensate for the thinner edge part of the first film layer. This makes the thickness of the coating layer formed on the display screen consistent between the middle part and the edge part, thereby effectively solving the problem of edge color difference caused by the inconsistent thickness between the middle part and the edge part of the coating layer on the display screen, and improving the user experience.

[0048] According to an exemplary embodiment, this embodiment provides a mask assembly for display screen coating, such as... Figures 1-4 As shown, this embodiment includes all the structures of the above embodiments. The difference between this embodiment and the above embodiments is that the first coating area 1 in this embodiment has a first direction and a second direction, and there is a preset angle between the first direction and the second direction. The preset angle between the first direction and the second direction is greater than 0 degrees and less than 180 degrees, and can be flexibly adjusted according to the number of displays and the actual situation of the process chamber in the coating process. In one example, the first coating area 1 is a rectangular area, the first direction is perpendicular to the second direction, and the first direction is the length direction of the rectangular area. Figures 1-4 The y-direction is the first direction, and the second direction is the width of the rectangular area. (Refer to...) Figures 1-4 The x-direction in the middle.

[0049] like Figures 2-3 As shown, each group of second coating areas 2 includes a first edge area 21 and / or a second edge area 22, wherein the first edge area 21 extends along a first direction, and the second edge area 22 extends along a second direction. The first edge area 21 can be a continuous region extending along the first direction or a discontinuous region extending along the first direction. Along the first direction, the length of the first edge area 21 can be less than the length of the first coating area 1, or the length of the first edge area 21 can be equal to the length of the first coating area 1. Along the second direction, the size of the first edge area 21 is 10% to 15% of the size of the first coating area 1. For example, if the size of the first coating area 1 in the second direction (i.e., the X direction) is 10 mm, meaning the width of the display screen is 10 mm, then the width of the first edge area 21 is 1 mm to 1.5 mm, to supplement the thickness of the edge of the display screen along the second direction, making the thickness of the coating layer of the entire display screen uniform.

[0050] The second edge region 22 can be a continuous region extending along the second direction or a discontinuous region extending along the second direction. Along the second direction, the length of the second edge region 22 can be less than the length of the first coating region 1, or the length of the second edge region 22 can be equal to the length of the first coating region 1. Along the first direction, the size of the second edge region 22 is 4% to 8% of the size of the first coating region 1. For example, if the size of the first coating region 21 in the first direction (i.e., the Y direction) is 20mm, meaning the length of the display screen is 20mm, then the width of the second edge region 22 is 1.6mm to 2mm, and the length of the second edge region is the length of the display screen in the second direction, to supplement the thickness of the edge of the display screen along the first direction, making the thickness of the coating layer of the entire display screen uniform. When the display screen of this embodiment is applied to a mobile phone scenario, the size of the first edge region 21 in the second direction can be, for example, 1mm, and the size of the second edge region 22 in the first direction can be, for example, 0.8mm.

[0051] In this embodiment, a first film layer is formed on the display screen using a first mask 10, and a second film layer is formed on the display screen using a second mask 20. By limiting the dimensions of the first edge region 21 and / or the second edge region 22 of the second mask 20 in the first and second directions, it is ensured that the second film layer formed by the second mask 20 effectively compensates for the edge portion of the first film layer, resulting in a better display effect for the entire display screen and avoiding the problem of edge color difference in the display screen.

[0052] The second mask 20 in this embodiment may have only a first edge region 21, only a second edge region 22, or both a first edge region 21 and a second edge region 22, depending on actual needs. The combination of the first edge region 21 and the second edge region 22 in the second mask 20 will be described in detail below.

[0053] In one example, the second coating area group 2 includes a first edge region 21. The second coating area group 2 may include one first edge region 21 or two first edge regions 21. When there is one first edge region 21, the first edge region 21 may be located on one side of the first coating area 1 along the second direction (X direction). When there are two first edge regions 21, refer to... Figure 2 The two first edge regions 21 are located on both sides of the first coating region 1 along the second direction.

[0054] In another example, the second coating area group 2 includes a second edge region 22. The second coating area group 2 may include one second edge region 22 or two second edge regions 22. When there is one second edge region 22, the second edge region 22 is located on one side of the first coating area 1 along the first direction (Y direction). When there are two second edge regions 22, refer to... Figure 3The two second edge regions 22 are located on both sides of the first coating region 1 along the first direction.

[0055] In another example, the second coating area group 2 includes a first edge area 21 and a second edge area 22. The second coating area group 2 may include one second edge area 22 and one second edge area 22, or it may include two second edge areas 22 and two second edge areas 22. When there is one first edge area 21 and one second edge area 22, the first edge area 21 may be located on one side of the first coating area 1 along the second direction (X direction), and the second edge area 22 may be located on one side of the first coating area 1 along the first direction (Y direction). When there are two first edge areas 21 and two second edge areas 22, refer to... Figure 4 Two first edge regions 21 are located on both sides of the first coating region 1 along the second direction, and two second edge regions 22 are located on both sides of the first coating region 1 along the first direction.

[0056] In this embodiment, by limiting the size of the first edge region and the size of the second edge region, any locations in the formed film layer that may have uneven thickness can be compensated for by the coating process using the second coating area group, thereby obtaining a uniformly thick encapsulation film layer, improving the display uniformity of the display screen, and solving the problem of color difference at the edges of the display screen.

[0057] According to an exemplary embodiment, this disclosure provides a coating process for a display screen, which uses a mask assembly for display screen coating as described in the above embodiments to encapsulate and coat the display screen. It is understood, of course, that the display screen coating process of this disclosure can also be used in the coating process during display screen manufacturing.

[0058] For reference Figure 5 The process flow diagram shown, combined with Figures 1 to 4 The coating process in this embodiment includes the following steps:

[0059] S1. Cover the display screen with a first mask, wherein the first mask has a plurality of first coating areas arranged in an array, each first coating area including a middle area and an edge area.

[0060] In this embodiment, a first film layer is first deposited on the display screen using a first mask 10. Before the deposition process, the first mask 10 is placed over the display screen, exposing each display screen by a first deposition area 1. The first mask 10 has multiple first deposition areas 1 arranged in an array. Each first deposition area 1 is a first cutout pattern formed on the first mask 10, through which the film is deposited on the display screen. Each first deposition area on the first mask 10 corresponds to one display screen, thus allowing multiple display screens to be deposited and encapsulated simultaneously using a single mask, improving processing efficiency.

[0061] S2. A first film layer is formed in the first coating area.

[0062] In this embodiment, the first coating area 1 includes a central area 11 and an edge area 12. The first film layer deposited on the display screen through the first coating area 1 also includes a central portion corresponding to the central area 11 and an edge portion corresponding to the edge area 12. Due to limitations in the coating process, the thickness of the central and edge portions of the first film layer is inconsistent after its formation on the display screen; for example, the central portion is thicker than the edge portion. Therefore, to address the issue of color distortion at the edges of the display screen caused by changes in optical refractive index and other properties due to the thickness difference between the central and edge portions of the first film layer, compensation is needed for the thinner edge portion.

[0063] S3. Cover the display screen with a second mask, wherein the second mask has multiple sets of second coating areas arranged in an array, the first coating area and the second coating area group are arranged correspondingly, and the second coating area group exposes the edge portion corresponding to the first film layer.

[0064] In this embodiment, a second film layer is deposited on the display screen using a second mask 20 to compensate for the edge portion of the first film layer. The second mask 20 has multiple arrayed groups of second coating areas 2, with multiple first coating areas 1 corresponding one-to-one with each group of second coating areas 2. Each second film area group includes a second coating area group 2, which includes a first edge area 21 and / or a second edge area 22. The first edge area 21 and / or the second edge area 22 are cutout areas formed on the second mask 20, corresponding to the edge areas 12 of the first coating areas 1. During the formation of the second film layer, the second mask 20 is placed over the display screen, covering the first film layer. The second mask 20 blocks the middle portion of the first film layer, while the second coating area groups 2 expose the edge portion of the first film layer.

[0065] S4. A second film layer is formed in the second coating zone.

[0066] In this embodiment, a second film layer is deposited on the display screen through the second coating area group 2. The second film layer is formed on the edge portion of the first film layer, thereby compensating for the edge portion of the first film layer and making the film thickness of the middle portion and the edge portion of the first film layer consistent. Furthermore, each second coating area group 2 corresponds to one first coating area 1, so the edge portions of the first film layers deposited by multiple first masks 10 can be compensated simultaneously by the second mask group 20, improving processing efficiency.

[0067] S5. The first film layer and the second film layer are connected as one to form a coating layer.

[0068] In this embodiment, the second film layer is directly formed on the thinner edge portion of the first film layer. The material of the first film layer is the same as that of the second film layer, so that the second film layer and the first film layer are integrated to form a coating layer with a uniform thickness, thereby solving the problem of uneven color at the edge of the display screen caused by the inconsistent thickness of the coating layer in the middle and at the edge.

[0069] In some embodiments, the thickness of the second film layer is 5% to 10% of the thickness of the first film layer, so as to ensure that the thickness of the coating layer formed by the second film layer and the first film layer being integrally connected is consistent in the middle and at the edge.

[0070] In some embodiments, the materials of the first and second films may be one or more combinations of metals, semiconductors, oxides, and fluorides.

[0071] In some embodiments, after the first film layer is formed on the display screen through the first mask 10, the first mask 10 can be left unremoved, and the second mask 20 can be directly applied over the first mask 10 to form the second film layer. After the second film layer is formed, the first mask 10 and the second mask 20 are removed simultaneously.

[0072] In some embodiments, after the first film layer is formed on the display screen through the first mask 10, the first mask 10 is directly removed, and then the second mask 20 is applied to form the second film layer. After the second film layer is formed, the second mask 20 is removed. The removal of the first mask 10 and the second mask 20 is a conventional technique in the art, such as removing the first mask 10 and the second mask 20 by removing a metal mesh, which will not be described in detail here.

[0073] The formation of the first and second film layers requires a coating process. This coating process involves creating a material layer on the display screen with dimensions ranging from several nanometers to several micrometers. The material forming the layer can be a metal, a semiconductor, or a compound such as an oxide or fluoride. For example, coating processes can include chemical vapor deposition (CVD), a technique that involves introducing one or more compounds or elemental gases containing the elements constituting the thin film into a reaction chamber containing a substrate, thereby depositing a solid thin film on the substrate surface through a gas-phase chemical reaction.

[0074] Besides chemical vapor deposition (CVD), coating processes can also include electroplating, chemical solution deposition (CSD), spin-coating, thermal evaporation, electron beam evaporation, sputtering, and pulsed laser deposition (PLD). Electroplating uses electrolysis to deposit a metal film onto the surface of a metal or other material. Chemical solution deposition (CSD) is a chemical reduction process that uses a reducing agent to reduce metal ions in a plating solution and deposit them onto a substrate surface. Spin-coating involves dripping various adhesive solutions onto a high-speed rotating substrate, using centrifugal force to uniformly coat the substrate. Thermal evaporation involves heating and evaporating a thin film material, which then condenses into a solid on a substrate surface at a lower temperature than the evaporation temperature to form a thin film. Electron beam evaporation: This method involves bombarding the coating material with an electron beam, heating and evaporating the material, and then depositing it onto a substrate. This disclosure does not limit the specific method of coating.

[0075] In some embodiments, in step S2, a first film layer is formed in the first coating area using chemical vapor deposition; or, in step S4, a second film layer is formed in the second coating area group using chemical vapor deposition; or, in steps S2 and S4, a first film layer is formed in the first coating area 1 and a second film layer is formed in the second coating area group using chemical vapor deposition, respectively. This embodiment uses chemical vapor deposition to better control the film thickness and density of the first and second film layers on the display screen, and the reactive film material required for film formation using chemical vapor deposition is more readily available, and the film formation apparatus is simple.

[0076] According to an exemplary embodiment, this embodiment proposes a display screen, which is encapsulated using the display screen coating process described in the above embodiment to form a coating layer. The process of depositing the coating layer on the display screen during encapsulation is as follows: First, a first mask 10 is placed over the display screen, wherein the first mask 10 has multiple first coating areas 1 arranged in an array, each first coating area 1 including a central area 11 and an edge area 12; then, a first film layer is formed on the first coating areas 1; next, a second mask 20 is placed over the display screen, wherein the second mask 20 has multiple groups of second coating areas 2 arranged in an array, the first coating areas 1 and the second coating area groups 2 are correspondingly arranged, and the second coating area groups 2 expose the edge portions corresponding to the first film layer; finally, a second film layer is formed on the second coating area groups 2; the first film layer and the second film layer are integrated to form a coating layer.

[0077] Because the first coating layer deposited on the display screen using the first mask has the problem of being thicker in the middle and thinner at the edges, this difference in film thickness can cause the display screen to have color differences at the edges. In this embodiment, a second film layer is formed on the first film layer using a second mask. The second film layer is located at the edge of the first film layer to compensate for the edge of the first film layer. Finally, the coating layer formed on the display screen has the same film thickness in the middle and at the edges.

[0078] The display screen in this embodiment uses a coating layer formed by the above-mentioned coating process for screen encapsulation, which solves the problem of uneven color at the edge of the display screen. During the display process, the display effect of the coating layer is uniform, the visual effect of the display screen is better, the customer satisfaction rate is improved, the overall reliability and aesthetics of the display screen are enhanced, and the user experience is improved.

[0079] According to an exemplary embodiment, this embodiment provides an electronic device, which includes the display screen described in the above embodiments. The electronic device of this embodiment can be a mobile phone, tablet computer, television, computer, or other display device. The display screen of this electronic device eliminates edge color distortion, provides uniform color display, and greatly improves the user experience.

[0080] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0081] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A mask assembly for coating a display screen, characterized in that, The mask assembly includes a first mask and a second mask. The first mask has a plurality of first coating areas arranged in an array, and the second mask has a plurality of groups of second coating areas arranged in an array. The first coating areas and the second coating area groups are arranged correspondingly. Each of the first coating areas includes a central area and an edge area. When the first mask and the second mask are stacked, the central area is blocked by the second mask, and the edge area is exposed by the second coating area group. The first coating area has a first direction and a second direction, and there is a preset angle between the first direction and the second direction; Each group of the second coating area includes a first edge area and a second edge area, the first edge area extending along the first direction and the second edge area extending along the second direction; along the first direction, the length of the first edge area is equal to the length of the first coating area; along the second direction, the length of the second edge area is equal to the length of the first coating area.

2. The mask assembly for display screen coating according to claim 1, characterized in that, Along the second direction, the size of the first edge region is 10% to 15% of the size of the first coating region.

3. A mask assembly for display screen coating according to claim 1, characterized in that, Along the first direction, the size of the second edge region is 4% to 8% of the size of the first coated region.

4. A mask assembly for display screen coating according to claim 1, characterized in that, The first mask and the second mask have the same thickness.

5. A coating process for a display screen, characterized in that, The coating process includes: A first mask is applied to the display screen, wherein the first mask has a plurality of first coating areas arranged in an array, each first coating area including a middle area and an edge area; A first film layer is formed in the first coating area; A second mask is applied to the display screen. The second mask has multiple arrayed groups of second coating areas. The first coating area corresponds to one of the second coating area groups, and the second coating area groups expose the edge region corresponding to the first film layer. The first coating area has a first direction and a second direction, with a preset angle between the first direction and the second direction. Each group of second coating areas includes a first edge region and a second edge region. The first edge region extends along the first direction, and the second edge region extends along the second direction. Along the first direction, the length of the first edge region is equal to the length of the first coating region. Along the second direction, the length of the second edge region is equal to the length of the first coating region. A second film layer is formed in the second coating area group; The first film layer and the second film layer are integrated to form a coating layer.

6. The coating process for the display screen according to claim 5, characterized in that, The thickness of the second film layer is 5% to 10% of the thickness of the first film layer.

7. The coating process for the display screen according to claim 5, characterized in that, The coating process also includes: After the first film layer is formed, before covering the second mask on the display screen, the first mask is removed; and / or, After the second film layer is formed, the second mask is removed.

8. The coating process for the display screen according to claim 5, characterized in that, The formation of the first film layer in the first coating area includes: The first film layer is formed in the first coating area using chemical vapor deposition. And / or, The formation of the second film layer in the second coating area group includes: The second film layer is formed in the second coating area using chemical vapor deposition.

9. A display screen, characterized in that, The display screen is encapsulated by forming a coating layer using the coating process described in any one of claims 5-8.

10. An electronic device, characterized in that, The electronic device includes the display screen as described in claim 9.

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