Display panel and preparation method thereof

Abstract

The invention relates to the technical field of displays, in particular to a display panel and a preparation method of the display panel. Comprising a substrate, an anode, a pixel definition layer and an isolation structure are formed on the substrate, pixel openings used for containing sub-pixels are formed in the pixel definition layer, the adjacent sub-pixels are isolated through the isolation structure, and an organic light-emitting layer and the anode are formed in the pixel openings respectively. When the first evaporation source has a first angle, the orthographic projection of the organic light-emitting layer and the orthographic projection of the pixel definition layer on the substrate can coincide, and the organic light-emitting layer does not make contact with the isolation structure; and when the second evaporation source has a second angle, the orthographic projection of the cathode and the orthographic projection of the pixel definition layer on the substrate can coincide, and at least one side of the cathode is electrically connected with the isolation structure, so that the sub-pixel can emit light. On the premise that the sub-pixels can emit light normally, the width of the pixel definition layer can be made to be small enough, pixel openings are increased, and therefore the pixel opening rate can be increased.

Description

Technical Field

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

[0002] At present, the preparation of OLED (Organic Light-Emitting Diode) all uses fine mask for evaporation. The mask is expensive, and it is very costly to launch new products. At the same time, the area of ​​the fine mask opening bridge also limits the effective area of ​​evaporation in the pixel light-emitting area, which is not conducive to improving the aperture ratio. Summary of the invention

[0003] The purpose of the present application is to provide a display panel and a method for manufacturing the display panel.

[0004] The present application provides a display panel, comprising: a substrate; an anode, the anode being arranged on the substrate at intervals; a pixel definition layer, the two sides of the pixel definition layer partially covering the anode, the pixel definition layer protruding from the substrate to form a pixel opening; an isolation structure, the isolation structure comprising a main body and a shielding part, the shielding part protruding toward the two side walls of the main body; an organic light-emitting layer, the organic light-emitting layer being evaporated on the anode by a first evaporation source, the two sides of the first evaporation source having the same evaporation angle with the substrate, the evaporation angle of the first evaporation source being set to a first angle; a cathode, the cathode being arranged on the organic light-emitting layer by a second evaporation source, in the evaporation direction, the second evaporation source The two sides of the two evaporation sources have different evaporation angles with the substrate, the evaporation angle between one side of the second evaporation source and the substrate is set to a second angle, and the evaporation angle between the other side of the two evaporation sources and the substrate is set to a third angle, the second angle is smaller than the first angle, and the third angle is larger than the first angle; wherein, under the shielding effect of the shielding portion, the first evaporation source has a first shadow area when it is at the first angle, and the second evaporation source has a second shadow area when it is at the second angle; the width of the shielding portion, the width of the first shadow area and the width of the second shadow area have a width and a, and the width of the pixel definition layer is greater than or equal to the width and a.

[0005] In an exemplary embodiment of the present application, in one of the pixel openings, the cathode is not in contact with the side wall of the main body; in another adjacent pixel opening, the cathode is in contact with the side wall of the main body.

[0006] In an exemplary embodiment of the present application, in the pixel opening, the organic light-emitting layer extends from the anode to the pixel definition layer, and the organic light-emitting layer is not in contact with a side wall of the main body.

[0007] In an exemplary embodiment of the present application, under the shielding effect of the shielding part, the second evaporation source has a third shadow area when it is at a third angle; in the length direction of the substrate, the isolation structure has a first side and a second side, and on the first side, the end of the pixel definition layer and the end of the shielding part have a first distance, and the first distance is greater than or equal to the width of the second shadow area; on the second side, the end of the pixel definition layer and the end of the shielding part have a second distance, and the second distance is greater than or equal to the width of the third shadow area; the first distance is greater than the second distance.

[0008] In an exemplary embodiment of the present application, the first evaporation source and the second evaporation source are sprayed through the same nozzle device, and the evaporation angles of the first evaporation source and the second evaporation source are changed by adjusting the nozzle device, so that the second angle is smaller than the first angle, and the third angle is larger than the first angle.

[0009] In an exemplary embodiment of the present application, the step of changing the evaporation angles of the first evaporation source and the second evaporation source by adjusting the nozzle device includes:

[0010] The nozzle device includes a nozzle and a baffle. In the length direction of the substrate, the nozzle and the isolation structure have corresponding first and second sides, the baffle is spaced between the first and second sides of the nozzle, and the baffle protrudes from the nozzle toward the substrate; when the organic light-emitting layer is formed by a first evaporation source, the protruding height of the baffle on the first side is the same as the protruding height of the baffle on the second side, and is configured as a first height; when the cathode is formed by a second evaporation source, the protruding height of the baffle on the first side is configured as a second height, and the protruding height of the baffle on the second side is configured as a third height, the second height is less than the first height, and the third height is greater than the first height.

[0011] In an exemplary embodiment of the present application, in the width direction of the substrate, the isolation structure has a third side and a fourth side, and on the third side, the end of the pixel definition layer and the end of the blocking portion have a third distance; on the fourth side, the end of the pixel definition layer and the end of the blocking portion have a fourth distance; the third distance is equal to the fourth distance, and the third distance and the fourth distance are between the first distance and the second distance.

[0012] In an exemplary embodiment of the present application, the nozzle device includes a nozzle and a baffle, and in the length direction of the substrate, the nozzle and the isolation structure have corresponding first and second sides, the baffle is spaced apart at the first and second sides of the nozzle, and the baffle protrudes from the nozzle toward the substrate so that the nozzle forms a gap on the third side and the fourth side; on the third side and the fourth side, the first evaporation source and the second evaporation source have the same evaporation angle at the gap, and the evaporation angle of the first evaporation source and the second evaporation source at the gap is set to a fourth angle, and the fourth angle is between the first angle and the third angle.

[0013] In an exemplary embodiment of the present application, a difference between the first distance and the second distance is greater than or equal to 0.5 nm.

[0014] The present application also provides a method for preparing a display panel, comprising:

[0015] A substrate is provided; anodes of sub-pixels are formed on the substrate, and the anodes are arranged at intervals; a pixel definition layer is formed at the intervals between the anodes, and the two sides of the pixel definition layer partially cover the anodes, and the pixel definition layer protrudes from the substrate to form a pixel opening; an isolation structure is formed on the pixel definition layer, and the isolation structure includes a main body and a shielding part, and the shielding part protrudes toward the two side walls of the main body; an organic light-emitting layer of the sub-pixel is formed in the pixel opening by a first evaporation source, and in the evaporation direction, the two sides of the first evaporation source have the same evaporation angle with the substrate, and the evaporation angle of the first evaporation source is set to a first angle so that the organic light-emitting layer does not contact the isolation structure; a cathode of the sub-pixel is formed in the pixel opening by a second evaporation source, and in the evaporation direction The two sides of the second evaporation source have different evaporation angles with the substrate, the evaporation angle between one side of the second evaporation source and the substrate is set to a second angle, and the evaporation angle between the other side of the second evaporation source and the substrate is set to a third angle, the second angle is smaller than the first angle, the third angle is larger than the first angle, and at least the cathode is in contact with the isolation structure on the side corresponding to the second angle; wherein, under the shielding effect of the shielding portion, the first evaporation source has a first shadow area when it is at the first angle, and the second evaporation source has a second shadow area when it is at the second angle; the width of the shielding portion, the width of the first shadow area and the width of the second shadow area have a width and a, and the width of the pixel definition layer is greater than or equal to the width and a.

[0016] A display panel and a method for preparing the display panel of the present application have the following beneficial effects: an anode, a pixel definition layer and an isolation structure are formed on a substrate, a pixel opening for accommodating a sub-pixel is formed on the pixel definition layer, adjacent sub-pixels are isolated by the isolation structure, and an organic light-emitting layer and an anode are formed in the pixel opening respectively. The organic light-emitting layer of the sub-pixel is formed in the pixel opening by a first evaporation source, and in the evaporation direction, the two sides of the first evaporation source have the same evaporation angle with the substrate, and the evaporation angle of the first evaporation source is set to a first angle. The cathode of the sub-pixel is formed in the pixel opening by a second evaporation source, and in the evaporation direction, the two sides of the second evaporation source have different evaporation angles with the substrate, the evaporation angle between one side of the second evaporation source and the substrate is set to a second angle, and the evaporation angle between the other side of the second evaporation source and the substrate is set to a third angle, the second angle is less than the first angle, and the third angle is greater than the first angle. Through the above design, an organic light-emitting layer of the same thickness can be formed on both sides of the isolation structure, and the cathode can be electrically connected to at least one side of the isolation structure by adjusting the angle of the second angle. Wherein, under the shielding effect of the shielding part, the first evaporation source has a first shadow area when it is at a first angle, and the second evaporation source has a second shadow area when it is at a second angle. Thus, when the first evaporation source has a first angle, the positive projections of the organic light-emitting layer and the pixel definition layer on the substrate can be overlapped, and the organic light-emitting layer is not in contact with the isolation structure; when the second evaporation source has a second angle, the positive projections of the cathode and the pixel definition layer on the substrate can be overlapped, and at least one side of the cathode is electrically connected to the isolation structure, so that the sub-pixel can emit light. Since the width of the shielding part, the width of the first shadow area, and the width of the second shadow area have a width and a, the width of the pixel definition layer is greater than or equal to the width and a. On the premise that the sub-pixel can emit light normally, the width of the pixel definition layer can be made small enough to increase the pixel opening, thereby improving the pixel opening ratio.

[0017] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1is a schematic structural diagram of a display panel in an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the first structure of preparing an organic light-emitting layer in an embodiment of the present invention;

[0022] Figure 3 is a second structural schematic diagram of preparing an organic light-emitting layer in an embodiment of the present invention;

[0023] Figure 4 is a third structural schematic diagram of preparing an organic light-emitting layer in an embodiment of the present invention;

[0024] Figure 5 is a fourth structural schematic diagram of preparing an organic light-emitting layer in an embodiment of the present invention;

[0025] Figure 6 is a fifth structural schematic diagram of preparing an organic light-emitting layer in an embodiment of the present invention;

[0026] Figure 7 is a sixth structural schematic diagram of preparing an organic light-emitting layer in an embodiment of the present invention;

[0027] Figure 8 is a schematic diagram of the first structure of preparing a cathode in an embodiment of the present invention;

[0028] Fig. 9 is a second structural schematic diagram of preparing a cathode in an embodiment of the present invention;

[0029] Fig.10 is a third structural schematic diagram of preparing a cathode in an embodiment of the present invention;

[0030] Fig.11 is a fourth structural schematic diagram of preparing a cathode in an embodiment of the present invention;

[0031] Fig.12 is a fifth structural schematic diagram of preparing a cathode in an embodiment of the present invention;

[0032] Fig.13 is a sixth structural schematic diagram of preparing a cathode in an embodiment of the present invention;

[0033] Fig.14 It is a schematic diagram of the process of forming an organic light-emitting layer and a cathode by evaporation of a nozzle device in an embodiment of the present invention;

[0034] Fig.15 is a schematic diagram of the structure of the spray head device for evaporating an organic light-emitting layer in an embodiment of the present invention;

[0035] Fig.16 Schematic diagram of the structure of the cathode of the spray head device in the embodiment of the present invention;

[0036] Fig.17Schematic diagram of the corresponding relationship between the spray angle and the film thickness in an embodiment of the present invention;

[0037] Fig.18 is a schematic structural diagram of pixel arrangement in a display panel according to an embodiment of the present invention;

[0038] Fig.19 It is a schematic flow chart of a method for preparing a display panel in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 10. Substrate; 20. Sub-pixel; 21. Anode; 22. Organic light-emitting layer; 23. Cathode; 30. Pixel definition layer; 40. Isolation structure; 41. Main body; 42. Shielding part; 401. First side; 402. Second side; 403. Third side; 404. Fourth side; 1. First evaporation source; 2. Second evaporation source; θ1. First angle; θ2. Second angle; θ3. Third angle; S1. First shadow area; S2. Second shadow area; S3. Third shadow area; D1. First distance; D2. Second distance; D3. Third distance; D4. Fourth distance; 50. Nozzle device; 51. Nozzle; 52. Baffle; H1. First height; H2. Second height; H3. Third height. DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0042] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0043] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0044] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0045] At present, the preparation of OLED (Organic Light-Emitting Diode) all uses fine mask for evaporation. The mask is expensive, and it is very costly to launch new products. At the same time, the area of ​​the fine mask opening bridge also limits the effective area of ​​evaporation in the pixel light-emitting area, which is not conducive to improving the aperture ratio.

[0046] Reference Figures 1 to 13 ,in Figure 1 is a schematic diagram of the structure of a display panel in an embodiment of the present invention, Figures 2 to 7 is a schematic flow chart of a method for preparing an organic light-emitting layer in a display panel according to an embodiment of the present invention. Figures 8 to 13 It is a schematic flow chart of a method for preparing a cathode in a display panel according to an embodiment of the present invention.

[0047] In order to solve the above technical problems, refer to Figure 1 As shown, the present application provides a display panel, including a substrate 10, an anode 21, a pixel definition layer 30, an isolation structure 40, an organic light-emitting layer 22 and a cathode 23. The anode 21 is arranged on the substrate 10 at intervals, and the two sides of the pixel definition layer 30 cover part of the anode 21. The pixel definition layer 30 protrudes from the substrate 10 to form a pixel opening. The isolation structure 40 includes a main body 41 and a shielding part 42, and the shielding part 42 protrudes to the two side walls of the main body 41. The organic light-emitting layer 22 is evaporated on the anode 21 by a first evaporation source 1. The two sides of the first evaporation source 1 have the same evaporation angle with the substrate 10, and the evaporation angle of the first evaporation source 1 is set to a first angle θ1. On the first side 401, the cathode 23 is disposed on the organic light-emitting layer 22 through the second evaporation source 2. In the evaporation direction, the two sides of the second evaporation source 2 have different evaporation angles with the substrate 10. The evaporation angle between one side of the second evaporation source 2 and the substrate 10 is set to the second angle θ2, and the evaporation angle between the other side of the second evaporation source and the substrate 10 is set to the third angle θ3. The second angle θ2 is smaller than the first angle θ1, and the third angle θ3 is larger than the first angle θ1. Under the shielding effect of the shielding portion 42, the first evaporation source 1 has a first shadow area S1 when it is the first angle θ1, and the second evaporation source 2 has a second shadow area S2 when it is the second angle θ2; the width of the shielding portion 42, the width of the first shadow area S1, and the width of the second shadow area S2 have a width and, and the width of the pixel definition layer 30 is greater than or equal to the width and.

[0048] like Figure 1 As shown, during evaporation, since the spray path of the evaporation source is fan-shaped, the edge of the fan-shaped cannot be directly evaporated on the substrate due to the shielding effect of the shielding portion 42, so the shielded area is the shielding area. Figure 1 Also shown is the normal of the substrate 10, which includes two normals coinciding with the two end points of the shielding portion 42, the area between the normal on the same side and the first evaporation source 1 on the same side is the first shadow area S1, the first shadow area S1 is between the normal on the right side of the shielding portion 42 and the right side of the first evaporation source 1; the area between the normal on the left side of the shielding portion 42 and the left side of the second evaporation source 2 is the second shadow area S2, and the area between the normal on the right side of the shielding portion 42 and the right side of the second evaporation source 2 is the third shadow area S3.

[0049] In this embodiment, Figure 1 As shown, under the shielding effect of the shielding portion 42, the first evaporation source 1 has a first shadow area S1 when it is at the first angle θ1, and the second evaporation source 2 has a second shadow area S2 when it is at the second angle θ2. The width of the shielding portion 42, the width of the first shadow area S1 and the width of the second shadow area S2 have a width and, and the width of the pixel definition layer 30 is greater than or equal to the width and. Thus, when the first evaporation source 1 has a first angle θ1, the positive projections of the organic light-emitting layer 22 and the pixel definition layer 30 on the substrate 10 can be overlapped, and the organic light-emitting layer 22 is not in contact with the isolation structure 40; when the second evaporation source 2 has a second angle θ2, the positive projections of the cathode 23 and the pixel definition layer 30 on the substrate 10 can be overlapped, and at least one side of the cathode 23 is electrically connected to the isolation structure 40, so that the sub-pixel 20 can emit light. On the premise that the sub-pixel 20 can emit light normally, the width of the pixel definition layer 30 can be made small enough to increase the pixel opening, thereby improving the pixel opening ratio.

[0050] In some embodiments, the material and preparation method of the substrate 10 are not limited here, and are selected according to actual needs; the material of the organic light-emitting layer 22 is not specifically limited here, and is selected according to actual needs.

[0051] In some embodiments, the material of the anode 21 includes metal oxide and metal, and the metal oxide generally includes indium tin oxide and indium zinc oxide, etc. The anodes 21 arranged at intervals can supply power to different sub-pixels 20 separately. The preparation method of the anode 21 is not limited here and is selected according to actual needs.

[0052] In some embodiments, each pixel opening corresponds to a sub-pixel 20. The size of the pixel opening determines the light transmittance of the pixel, which plays a vital role in the performance of the display panel. The shape of the pixel opening determines the shape of the sub-pixel 20, that is, the shape of the sub-pixel 20 corresponds to the shape of the pixel opening. The material and preparation method of the pixel definition layer 30 are not limited here, and are selected according to actual needs.

[0053] In some embodiments, reference Figure 1 As shown, the isolation structure 40 is used to isolate adjacent sub-pixels 20 to achieve independent packaging of each sub-pixel 20. The isolation structure 40 generally includes a conductive main body 41 and an insulating shielding portion 42. The main body 41 can not only have an isolation function but also realize electrical connection between the anodes 21 of different sub-pixels 20. The shielding portion 42 can play a shielding role when the sub-pixel 20 is evaporated to control the evaporation area and thickness of the organic light-emitting layer 22 and the cathode 23 material in the sub-pixel 20.

[0054] like Figure 1 As shown, an isolation structure 40 and pixel openings on both sides of the isolation structure 40 are shown, which are mainly explained by the illustrated structure. An isolation structure 40 can enclose multiple pixel openings, and the sub-pixels 20 in the multiple pixel openings enclosed by the single isolation structure 40 correspond to the same color pixels to avoid pixel crosstalk. The isolation structure 40 can also be other structures, which are not too limited here and can be selected according to actual needs.

[0055] In some embodiments, the evaporation is performed in a vacuum environment, the substrate 10 is moved at a constant speed during the evaporation, and the evaporation source of the organic light-emitting layer 22 material and the cathode 23 material hereinafter is fixed, so that the organic light-emitting material is uniformly formed in the pixel opening. The direction of evaporation is defined as the direction from the start of evaporation from the evaporation source to the end of evaporation. Figures 2 to 7 , the moving direction of the substrate 10 is from right to left, that is, the evaporation source starts evaporation from the left side of the substrate 10 and ends evaporation at the right side of the substrate 10, that is, the evaporation direction is from left to right. The evaporation source is formed in the pixel opening by spraying, and its spraying path is fan-shaped. The evaporation angle is the angle between the edge of the evaporation source (i.e., the edge of the fan) and the substrate 10. For details, refer to Figure 4 , Figure 5 , Fig.10 and Fig.11 shown.

[0056] In some embodiments, the first evaporation source 1 is a vaporized form of the material of the organic light-emitting layer 22, obtained by subjecting the raw material to high temperature treatment. The first evaporation source 1 is formed on the anode 21 and the pixel definition layer 30 in the pixel opening by evaporation, and the organic light-emitting layer 22 at least covers the anode 21 and a portion of the pixel definition layer 30. During the evaporation process, the first evaporation source 1 is also formed on the shielding portion 42.

[0057] like Figure 2 and Figure 7 As shown, the first evaporation source 1 sprays in a fan shape, and the two sides of the first evaporation source 1 have the same evaporation angle with the substrate 10, that is, the angles between the two side edges of the spray path and the substrate 10 are the same. As a result, the same shadow area can be formed on both sides of the isolation structure 40, so that the distance between the organic light-emitting layer 22 on both sides of the isolation structure 40 and the isolation structure 40 is the same. When evaporation is performed at the first angle θ1, the organic light-emitting layer 22 can be prevented from contacting the isolation structure 40. It is necessary to reasonably design the protruding width of the shielding portion 42 and the spraying range of the first evaporation source 1. Here, the protruding width of the shielding portion 42 and the spraying range of the first evaporation source 1 can be obtained by calculation.

[0058] Furthermore, a cathode 23 of a sub-pixel 20 is formed in a pixel opening through a second evaporation source 2. In the evaporation direction, two sides of the second evaporation source 2 have different evaporation angles with the substrate 10. The evaporation angle between one side of the second evaporation source 2 and the substrate 10 is set to a second angle θ2, and the evaporation angle between the other side of the second evaporation source 2 and the substrate 10 is set to a third angle θ3. The second angle θ2 is smaller than the first angle θ1, and the third angle θ3 is larger than the first angle θ1. At least on the side corresponding to the second angle θ2, the cathode 23 is arranged in contact with the isolation structure 40.

[0059] In some embodiments, the second evaporation source 2 is a vaporized form of the cathode 23 material, obtained by subjecting the raw material to high temperature treatment. The second evaporation source 2 is formed on the organic light emitting layer 22 in the pixel opening by evaporation.

[0060] like Figure 8 and Fig.13 As shown, the second evaporation source 2 sprays in a fan shape, and the two sides of the second evaporation source 2 have different evaporation angles with the substrate 10 , that is, the angles between the two side edges of the spray path and the substrate 10 are different.

[0061] If one side of the second evaporation source 2 is the left side, the other side of the second evaporation source 2 is the right side. It is understandable that defining the two sides of the second evaporation source 2 as the left side and the right side is only for the convenience of describing the embodiment, and is not a specific limitation.

[0062] The first evaporation source 1 and the second evaporation source 2 may be sprayed through the same nozzle 51 device 50, or may be sprayed through different nozzles 51 devices 50. In this embodiment, the spraying is mainly performed by the same nozzle 51 device 50. When the same nozzle 51 device 50 is sprayed, the nozzle 51 device 50 needs to be adjusted after the first evaporation source 1 is sprayed to change the evaporation angle.

[0063] like Figure 8 and Fig.13 As shown, during evaporation, the right side of the second evaporation source 2 will first reach the pixel opening, and gradually the left side will reach the pixel opening, thereby forming a film layer structure with appropriate thickness. In each pixel opening, since the third angle θ3 is greater than the first angle θ1, the pixel definition layer 30 on the left side of the isolation structure 40 cannot cover the entire organic light-emitting layer 22, but since the part that cannot be covered is located on the pixel definition layer 30, it will not affect the transmittance of the sub-pixel 20. Since the third angle θ3 is larger, the second angle θ2 will be smaller, and more cathode 23 material will be evaporated on the main body 41 of the isolation structure 40 on the right side of the isolation structure 40, so that the cathode 23 can form a larger contact area while being in contact with the isolation structure 40, thereby reducing the voltage drop of the cathode 23.

[0064] In some embodiments, Figure 1 As shown, in one pixel opening, the cathode 23 does not contact the side wall of the main body 41; in another adjacent pixel opening, the cathode 23 is arranged in contact with the side wall of the main body 41. In the pixel opening, the organic light-emitting layer 22 extends from the anode 21 to the pixel definition layer 30, and the organic light-emitting layer 22 does not contact the side wall of the main body 41. Thus, the cathodes 23 of adjacent sub-pixels 20 are electrically connected through the isolation structure 40, and the organic light-emitting layer 22 is arranged between the cathode 23 and the anode 21, which can achieve normal display of each sub-pixel 20 while reducing the voltage drop of the display panel.

[0065] In some embodiments, Figure 1As shown, under the shielding effect of the shielding portion 42, the second evaporation source 2 has a third shadow area S3 when it is at the third angle θ3. In the length direction of the substrate 10, the isolation structure 40 has a first side 401 and a second side 402. On the first side 401, the end of the pixel definition layer 30 and the end of the shielding portion 42 have a first distance D1, and the first distance D1 is greater than or equal to the width of the second shadow area S2; on the second side 402, the end of the pixel definition layer 30 and the end of the shielding portion 42 have a second distance D2, and the second distance D2 is greater than or equal to the width of the third shadow area S3; the first distance D1 is greater than the second distance D2. Since the second angle θ2 is smaller than the first angle θ1, in order to make the formed second shadow area S2 larger than the third shadow area S3, it is necessary to set the first distance D1 to be greater than the second distance D2, so that on both sides of the isolation structure 40, the cathode 23 material can be formed on the pixel definition layer 30 during evaporation. Thus, the prerequisite for overlapping the cathode 23 and the isolation structure 40 is produced, so that the cathode 23 can be overlapped with the isolation structure 40 after being formed.

[0066] In some embodiments, the first evaporation source 1 and the second evaporation source 2 are sprayed through the same nozzle 51 device 50, and the evaporation angles of the first evaporation source 1 and the second evaporation source 2 are changed by adjusting the nozzle 51 device 50, so that the second angle θ2 is smaller than the first angle θ1, and the third angle θ3 is larger than the first angle θ1.

[0067] In some embodiments, the nozzle 51 device 50 is a power device that sprays the first evaporation source 1 and the second evaporation source 2 onto the substrate to form the above-mentioned fan-shaped spray shape, wherein the spray range, speed, pressure and other parameters determine the film formation quality. The parameters of the nozzle 51 device 50 are not specifically limited here and are selected according to actual needs.

[0068] In some embodiments, the nozzle 51 device 50 includes a nozzle 51 and a baffle 52. When adjusting the nozzle 51 device 50, the nozzle 51 device 50 may be adjusted as a whole, or the nozzle 51 or the baffle 52 of the nozzle 51 device 50 may be adjusted to change the evaporation angle of the first evaporation source 1 and / or the second evaporation source 2. In this embodiment, the baffle 52 is mainly changed for detailed description.

[0069] Reference Figures 14 to 17 , Fig.14 It is a schematic diagram of the process of forming an organic light-emitting layer and a cathode by evaporation of a nozzle device in an embodiment of the present invention; Fig.15 is a schematic diagram of the structure of the spray head device for evaporating an organic light-emitting layer in an embodiment of the present invention; Fig.16 Schematic diagram of the structure of the cathode of the spray head device in the embodiment of the present invention; Fig.17 Schematic diagram of the corresponding relationship between the spray angle and the film thickness in the embodiment of the present invention.

[0070] In some embodiments, the evaporation angles of the first evaporation source and the second evaporation source are changed by adjusting the nozzle device, which specifically includes the following steps S710 to S730.

[0071] Step S710: In the length direction of the substrate 10 , the nozzle 51 and the isolation structure 40 have corresponding first sides 401 and second sides 402 , and the baffle 52 is spaced apart between the first side 401 and the second side 402 of the nozzle 51 , and the baffle 52 protrudes from the nozzle 51 toward the substrate 10 .

[0072] like Fig.15 and Fig.16 As shown, the nozzle 51 and the isolation structure 40 have corresponding first sides 401 and second sides 402, that is, when the nozzle 51 coincides with the center line of the isolation structure 40, the first side 401 of the isolation structure 40 and the first side 401 of the nozzle 51 are located on the same side, and the second side 402 of the isolation structure 40 and the second side 402 of the nozzle 51 are located on the same side.

[0073] like Fig.14 and Fig.16 As shown, the outlet of the nozzle 51 is located between two baffles 52, and the baffle 52 is protruded from the nozzle 51 toward the substrate 10. The spraying angle of the sprayed evaporation source is limited by the two baffles 52 so that the evaporation source can spray according to the expected spraying path.

[0074] Step S720 : when the organic light emitting layer 22 of the sub-pixel 20 is formed by the first evaporation source 1 , the protruding height of the baffle 52 on the first side 401 is the same as the protruding height of the baffle 52 on the second side 402 , and is configured as a first height H1 .

[0075] like Fig.15 As shown, when the organic light emitting layer 22 is evaporated, the height of the baffle 52 protruding from the first side 401 is the same as the height of the baffle 52 protruding from the second side 402, so that the same evaporation angle can be achieved between the two sides of the first evaporation source 1 and the substrate 10. The specific angle and film thickness are selected according to the corresponding relationship.

[0076] like Fig.17 As shown in the figure, in the correspondence between the spray angle and the film thickness, when the evaporation angle changes from 0 to 180 degrees, the film thickness first increases and then decreases, and the correspondence between the two changes in a parabolic curve. The film thickness is the smallest at 0 and 180 degrees, and the film thickness is the largest at 90 degrees. Through such a correspondence, the spray angle can be adjusted to obtain the corresponding film thickness. The spray angle and the evaporation angle are complementary angles.

[0077] Step S730: Fig.16As shown, when the cathode 23 of the sub-pixel 20 is formed by the second evaporation source 2, the height of the protrusion of the baffle 52 on the first side 401 is configured as the second height H2, and the height of the protrusion of the baffle 52 on the second side 402 is configured as the third height H3, the second height H2 is less than the first height H1, and the third height H3 is greater than the first height H1. Thus, the second angle θ2 can be made smaller than the first angle θ1, and the third angle θ3 can be made greater than the first angle θ1. The specific angles and film thicknesses are selected according to the corresponding relationship.

[0078] In some embodiments, Fig.18 As shown, it includes three sub-pixels 20 arranged mutually, wherein the three sub-pixels 20 are red sub-pixels, blue sub-pixels and green sub-pixels. In the width direction of the substrate 10, the isolation structure 40 has a third side 403 and a fourth side 404. On the third side 403, the end of the pixel definition layer 30 and the end of the shielding portion 42 have a third distance D3; on the fourth side 404, the end of the pixel definition layer 30 and the end of the shielding portion 42 have a fourth distance D4; the third distance D3 is equal to the fourth distance D4, and the third distance D3 and the fourth distance D4 are between the first distance D1 and the second distance D2. Thus, the width of the organic light-emitting layer 22 formed on the third side 403 and the fourth side 404 is the same as the width of the cathode 23, and it can be selected whether to overlap the cathode 23 with the main body 41 of the isolation structure 40 as needed.

[0079] In some embodiments, the baffle 52 is arranged to protrude from the nozzle 51 toward the substrate 10, so that the nozzle 51 forms a notch on the third side 403 and the fourth side 404. On the third side 403 and the fourth side 404, the first evaporation source 1 and the second evaporation source 2 have the same evaporation angle at the notch, and the evaporation angle of the first evaporation source 1 and the second evaporation source 2 at the notch is set to a fourth angle θ4. The fourth angle θ4 is between the first angle θ1 and the third angle θ3. Thus, the evaporation source is sprayed onto the substrate from the notch to form an organic light-emitting layer 22 and a cathode 23 with the same width, the width of the organic light-emitting layer 22 on the third side 403 and the fourth side 404 is between the width of the organic light-emitting layer 22 on the first side 401 and the second side 402, and the width of the cathode 23 on the third side 403 and the fourth side 404 is between the width of the cathode 23 on the first side 401 and the second side 402, so that the pixel opening can be increased and the pixel opening ratio can be improved. Specifically, the difference between the first distance D1 and the second distance D2 is greater than or equal to 0.5 nm.

[0080] The present application also provides a method for preparing a display panel, referring to Figures 2 to 13 , Fig.19 , specifically including the following steps S100 to S600.

[0081] Step S100: providing a substrate 10 .

[0082] Step S200: forming anodes 21 of sub-pixels 20 on substrate 10, wherein anodes 21 are arranged at intervals. The method for preparing anodes 21 is not limited here, and can be selected according to actual needs.

[0083] Step S300: forming a pixel definition layer 30 on the interval between the anodes 21, with the two sides of the pixel definition layer 30 covering part of the anodes 21, and the pixel definition layer 30 protruding from the substrate 10 to form a pixel opening. The material and preparation method of the pixel definition layer 30 are not limited here, and can be selected according to actual needs.

[0084] Step S400 : forming an isolation structure 40 on the pixel definition layer 30 , wherein the isolation structure 40 includes a main body 41 and a shielding portion 42 , wherein the shielding portion 42 is protruded toward two side walls of the main body 41 .

[0085] Step S500: An organic light-emitting layer 22 of a sub-pixel 20 is formed in a pixel opening through a first evaporation source 1. In the evaporation direction, both sides of the first evaporation source 1 have the same evaporation angle with the substrate 10. The evaporation angle of the first evaporation source 1 is set to a first angle θ1, so that the organic light-emitting layer 22 does not contact the isolation structure 40.

[0086] Step S600: forming a cathode 23 of a sub-pixel 20 in a pixel opening through a second evaporation source 2, wherein in the evaporation direction, two sides of the second evaporation source 2 have different evaporation angles with the substrate 10, a evaporation angle between one side of the second evaporation source 2 and the substrate 10 is set to a second angle θ2, and a evaporation angle between the other side of the second evaporation source 2 and the substrate 10 is set to a third angle θ3, wherein the second angle θ2 is smaller than the first angle θ1, and the third angle θ3 is larger than the first angle θ1, and the cathode 23 is at least arranged in contact with the isolation structure 40 on the side corresponding to the second angle θ2;

[0087] Among them, under the shielding effect of the shielding part 42, the first evaporation source 1 has a first shadow area S1 when it is at the first angle θ1, and the second evaporation source 2 has a second shadow area S2 when it is at the second angle θ2; the width of the shielding part 42, the width of the first shadow area S1 and the width of the second shadow area S2 have a width and, and the width of the pixel definition layer 30 is greater than or equal to the width and.

[0088] In this embodiment, the above design can form an organic light-emitting layer of the same thickness on both sides of the isolation structure, and the cathode can be electrically connected to at least one side of the isolation structure by adjusting the second angle, so that the sub-pixel can emit light. On the premise that the sub-pixel can emit light normally, the width of the pixel definition layer is made small enough to increase the pixel opening, thereby improving the pixel opening ratio.

[0089] In this application, unless otherwise clearly specified and limited, the terms "disposed (provided with)", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0090] In the description of this specification, the description of reference terms such as "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0091] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. A display panel, characterized in that: include: substrate; Anodes, the anodes are arranged on the substrate at intervals; A pixel definition layer, wherein two sides of the pixel definition layer cover part of the anode, and the pixel definition layer protrudes from the substrate to form a pixel opening; An isolation structure, the isolation structure comprising a main body and a shielding portion, the shielding portion protruding toward two side walls of the main body; An organic light-emitting layer, wherein the organic light-emitting layer is evaporated on the anode by a first evaporation source, and both sides of the first evaporation source have the same evaporation angle with the substrate, and the evaporation angle of the first evaporation source is set to a first angle; a cathode, wherein the cathode is disposed on the organic light-emitting layer through a second evaporation source, and in the evaporation direction, two sides of the second evaporation source have different evaporation angles with the substrate, the evaporation angle between one side of the second evaporation source and the substrate is set to a second angle, and the evaporation angle between the other side of the second evaporation source and the substrate is set to a third angle, the second angle is smaller than the first angle, and the third angle is larger than the first angle; Wherein, under the shielding effect of the shielding part, the first evaporation source has a first shadow area when it is at a first angle, and the second evaporation source has a second shadow area when it is at a second angle; the width of the shielding part, the width of the first shadow area and the width of the second shadow area have a width and a width, and the width of the pixel definition layer is greater than or equal to the width and a width.

2. The display panel according to claim 1, characterized in that: In one of the pixel openings, the cathode is not in contact with the side wall of the main body; in another adjacent pixel opening, the cathode is in contact with the side wall of the main body.

3. The display panel according to claim 1, characterized in that: In the pixel opening, the organic light emitting layer extends from the anode to the pixel definition layer, and the organic light emitting layer is not in contact with a side wall of the main body.

4. The display panel according to claim 1, characterized in that: Under the shielding effect of the shielding portion, the second evaporation source has a third shadow area when it is at a third angle; In the length direction of the substrate, the isolation structure has a first side and a second side. On the first side, the end of the pixel definition layer and the end of the shielding portion have a first distance, and the first distance is greater than or equal to the width of the second shadow area; on the second side, the end of the pixel definition layer and the end of the shielding portion have a second distance, and the second distance is greater than or equal to the width of the third shadow area; the first distance is greater than the second distance.

5. The display panel according to claim 4, characterized in that: The first evaporation source and the second evaporation source are sprayed through the same nozzle device, and the evaporation angles of the first evaporation source and the second evaporation source are changed by adjusting the nozzle device, so that the second angle is smaller than the first angle and the third angle is larger than the first angle.

6. The display panel according to claim 5, characterized in that: The method of changing the evaporation angles of the first evaporation source and the second evaporation source by adjusting the nozzle device comprises: The nozzle device comprises a nozzle and a baffle, wherein in the length direction of the substrate, the nozzle and the isolation structure have the first side and the second side corresponding to each other, the baffle is arranged at intervals between the first side and the second side of the nozzle, and the baffle is arranged to protrude from the nozzle toward the substrate; When the organic light-emitting layer is formed by a first evaporation source, the height of the baffle protrusion on the first side is the same as the height of the baffle protrusion on the second side, and is configured as a first height; When the cathode is formed by a second evaporation source, the protruding height of the baffle on the first side is configured as a second height, and the protruding height of the baffle on the second side is configured as a third height, the second height is smaller than the first height, and the third height is greater than the first height.

7. The display panel according to claim 5, characterized in that: In the width direction of the substrate, the isolation structure has a third side and a fourth side, and on the third side, the end of the pixel definition layer and the end of the blocking portion have a third distance; on the fourth side, the end of the pixel definition layer and the end of the blocking portion have a fourth distance; the third distance is equal to the fourth distance, and the third distance and the fourth distance are between the first distance and the second distance.

8. The display panel according to claim 7, characterized in that: The nozzle device comprises a nozzle and a baffle, wherein in the length direction of the substrate, the nozzle and the isolation structure have corresponding first and second sides, the baffle is arranged at intervals between the first and second sides of the nozzle, and the baffle is arranged to protrude from the nozzle toward the substrate so that the nozzle forms a notch on the third and fourth sides; On the third side and the fourth side, the first evaporation source and the second evaporation source have the same evaporation angle in the notch, and the evaporation angle of the first evaporation source and the second evaporation source in the notch is set to a fourth angle, and the fourth angle is between the first angle and the third angle.

9. The display panel according to claim 4, characterized in that: A difference between the first distance and the second distance is greater than or equal to 0.5 nm.

10. A method for preparing a display panel, characterized in that: include: providing a substrate; forming anodes of sub-pixels on the substrate, wherein the anodes are arranged at intervals; forming a pixel definition layer on the intervals between the anodes, wherein both sides of the pixel definition layer cover part of the anodes, and the pixel definition layer protrudes from the substrate to form a pixel opening; An isolation structure is formed on the pixel definition layer, wherein the isolation structure includes a main body and a shielding portion, and the shielding portion is protruded toward two side walls of the main body; An organic light-emitting layer of the sub-pixel is formed in the pixel opening by a first evaporation source, and in the evaporation direction, two sides of the first evaporation source have the same evaporation angle with the substrate, and the evaporation angle of the first evaporation source is set to a first angle so that the organic light-emitting layer does not contact the isolation structure; A cathode of the sub-pixel is formed in the pixel opening by a second evaporation source, in the evaporation direction, two sides of the second evaporation source have different evaporation angles with the substrate, the evaporation angle between one side of the second evaporation source and the substrate is set to a second angle, and the evaporation angle between the other side of the second evaporation source and the substrate is set to a third angle, the second angle is smaller than the first angle, the third angle is larger than the first angle, and at least the cathode is arranged in contact with the isolation structure on the side corresponding to the second angle; Wherein, under the shielding effect of the shielding part, the first evaporation source has a first shadow area when it is at a first angle, and the second evaporation source has a second shadow area when it is at a second angle; the width of the shielding part, the width of the first shadow area and the width of the second shadow area have a width and a width, and the width of the pixel definition layer is greater than or equal to the width and a width.

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