Display panel and preparation method of display panel

Abstract

The application relates to the technical field of displays, in particular to a display panel and a preparation method thereof. The display panel comprises a substrate, an anode, a pixel definition layer and an isolation structure are formed on the substrate, a pixel opening for accommodating a sub-pixel is formed on the pixel definition layer, adjacent sub-pixels are isolated through the isolation structure, and an organic light-emitting layer and the anode are respectively formed in the pixel opening. When a first evaporation source has a first angle, the normal projection 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 a second evaporation source has a second angle, the normal projection of the cathode and the pixel definition layer on the substrate can be overlapped, and the cathode is electrically connected with the isolation structure on at least one side, so that the sub-pixel can emit light. Under the premise that the sub-pixel can normally emit light, the width of the pixel definition layer can be made small enough, the pixel opening is increased, and therefore the pixel opening rate can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and a preparation method of the display panel. BACKGROUND

[0002] Currently, OLED (Organic Light-Emitting Diode) is prepared by using a fine mask plate for evaporation, and the mask plate is expensive. When a new product is developed, a huge cost is consumed. Meanwhile, the opening bridge of the fine mask plate also limits the effective area of the pixel light-emitting area for evaporation, which is not conducive to the improvement of the opening rate. SUMMARY

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

[0004] The present application provides a display panel, comprising: a substrate; an anode, which is spaced apart on the substrate; a pixel definition layer, which covers part of the anode on both sides, and protrudes from the substrate to form a pixel opening; an isolation structure, which comprises a main body and a shielding part, and the shielding part is protrudingly arranged on both side walls of the main body; an organic light-emitting layer, which is evaporated on the anode by a first evaporation source, and the evaporation angle between both sides of the first evaporation source and the substrate is the same, and the evaporation angle of the first evaporation source is set to a first angle; a cathode, which is arranged on the organic light-emitting layer by a second evaporation source, and in the evaporation direction, the evaporation angles between both sides of the second evaporation source and the substrate are different, 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 the evaporation angle is the first angle, and the second evaporation source has a second shadow area when the evaporation angle is the 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 sum, and the width of the pixel definition layer is greater than or equal to the width sum.

[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; and 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 the side wall of the main body.

[0007] In an example embodiment of the present application, the second evaporation source has a third shadow area when the second evaporation source is at a third angle under the shielding of the shielding part; 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 part have a first distance, 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, 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 example embodiment of the present application, the first evaporation source and the second evaporation source are ejected through the same showerhead device, the evaporation angle of the first evaporation source and the second evaporation source is changed by adjusting the showerhead device, so that the second angle is less than the first angle, and the third angle is greater than the first angle.

[0009] In an example embodiment of the present application, the evaporation angle of the first evaporation source and the second evaporation source is changed by adjusting the showerhead device, including:

[0010] The showerhead device includes a showerhead and a baffle, in the length direction of the substrate, the showerhead has a fifth side and a sixth side corresponding to the first side and the second side of the isolation structure respectively, the baffle is spaced apart from the fifth side and the sixth side, and the baffle is protrudingly arranged from the showerhead towards the substrate; when the organic light-emitting layer is formed by the first evaporation source, the protruding height of the baffle of the fifth side and the protruding height of the baffle of the sixth side are the same and are configured as a first height; when the cathode is formed by the second evaporation source, the protruding height of the baffle of the fifth side is configured as a second height, the protruding height of the baffle of the sixth 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 example embodiment of the present application, in the width direction of the substrate, the isolation structure has a third side and a fourth side, on the third side, the end of the pixel definition layer and the end of the shielding part have a third distance; on the fourth side, the end of the pixel definition layer and the end of the shielding part 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 example embodiment of the present application, the showerhead device includes a showerhead and a baffle, the showerhead has a fifth side and a sixth side corresponding to the first side and the second side of the isolation structure respectively in the length direction of the substrate, the baffle is arranged between the fifth side and the sixth side of the showerhead, the baffle is arranged protruding from the showerhead towards the substrate to form a gap in the third side and the fourth side of the showerhead; in the third side and the fourth side, the first evaporation source and the second evaporation source have the same evaporation angle in the gap, the evaporation angle of the first evaporation source and the second evaporation source in the gap is set to a fourth angle, the fourth angle is between the first angle and the third angle.

[0013] In an example embodiment of the present application, the 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 preparation method of a display panel, including:

[0015] A substrate is provided; anodes of sub-pixels are formed on the substrate, the anodes are arranged at intervals; a pixel definition layer is formed on the intervals of the anodes, both sides of the pixel definition layer cover part of the anodes, the pixel definition layer protrudes from the substrate to form a pixel opening; an isolation structure is formed on the pixel definition layer, the isolation structure includes a main body part and a shielding part, the shielding part is arranged protruding from both side walls of the main body part; an organic light-emitting layer of the sub-pixel is formed by a first evaporation source in the pixel opening, in the evaporation direction, both sides of the first evaporation source and the substrate have the same evaporation angle, 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 by a second evaporation source in the pixel opening, in the evaporation direction, both sides of the second evaporation source and the substrate have different evaporation angles, the evaporation angle between one side of the second evaporation source and the substrate is set to a second angle, 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 greater than the first angle, at least the side corresponding to the second angle makes the cathode contact the isolation structure; wherein, under the shielding effect of the shielding part, the first evaporation source has a first shadow area when the evaporation angle is the first angle, and the second evaporation source has a second shadow area when the evaporation angle is the 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 sum, and the width of the pixel definition layer is greater than or equal to the width sum.

[0016] The display panel and the preparation method of the display panel 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 the anode are respectively formed in the pixel opening. The organic light-emitting layer of the sub-pixel is formed in the pixel opening by a first evaporation source. 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. 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, and the third angle is larger than the first angle. Through the above design, the organic light-emitting layer with the same thickness can be formed on both sides of the isolation structure, and by adjusting the angle of the second angle, the cathode can be electrically connected to at least one side of the isolation structure. Wherein, under the shielding effect of the shielding part, the first evaporation source has a first shadow area when the first angle is the first angle, and the second evaporation source has a second shadow area when the second angle is the second angle. Therefore, when the first evaporation source has the first angle, the normal projection 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 the second angle, the normal projection of the cathode and the pixel definition layer on the substrate can be overlapped, and the cathode is electrically connected to at least one side of 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 sum, and the width of the pixel definition layer is greater than or equal to the width sum. Under the premise of meeting the normal light-emitting of the sub-pixel, the width of the pixel definition layer can be made small enough, so that the pixel opening is increased, and thus the pixel opening rate can be improved.

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

[0018] It should be understood that the general description above and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings incorporated in the specification and constituting a part of it illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

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

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

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

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

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

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

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

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

[0028] Figure 9 is a second structural schematic diagram of preparing a cathode in an embodiment of the present application;

[0029] Figure 10 is a third structural schematic diagram of preparing a cathode in an embodiment of the present application;

[0030] Figure 11 is a fourth structural schematic diagram of preparing a cathode in an embodiment of the present application;

[0031] Figure 12 is a fifth structural schematic diagram of preparing a cathode in an embodiment of the present application;

[0032] Figure 13 is a sixth structural schematic diagram of preparing a cathode in an embodiment of the present application;

[0033] Figure 14 is a flow schematic diagram of forming an organic light-emitting layer and a cathode by a shower head device in an embodiment of the present application;

[0034] Figure 15 is a structural schematic diagram of forming an organic light-emitting layer by a shower head device in an embodiment of the present application;

[0035] Figure 16 is a structural schematic of forming a cathode by a shower head device in an embodiment of the present application;

[0036] Figure 17This is a schematic diagram illustrating the relationship between the spray angle and the film thickness in an embodiment of the present invention;

[0037] Figure 18 This is a schematic diagram of the pixel arrangement in the display panel in an embodiment of the present invention;

[0038] Figure 19 This is a schematic flowchart of a method for preparing a display panel according to an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10. Substrate; 20. Subpixel; 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 vapor deposition source; 2. Second vapor deposition 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 Implementation

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

[0042] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0043] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments 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 intended to explain the present application, and should not be construed as limiting the present application.

[0044] It should be noted that the "multiple" referred to in this paper refers to two or more than two. The association relationship of "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. The character " / " generally represents that the front and rear associated objects are in an "or" relationship.

[0045] Currently, OLED (Organic Light-Emitting Diode) is prepared by using a fine mask plate for evaporation. The mask plate is expensive, and it costs a lot when a new product is developed. At the same time, the opening bridging area of the fine mask plate also limits the effective area of the pixel light-emitting area for evaporation, which is not conducive to the improvement of the opening rate.

[0046] Referring to Figures 1 to 13 , wherein Figure 1 is a structural schematic diagram of a display panel in the embodiment of the application, Figures 2 to 7 is a flowchart of a preparation method of an organic light-emitting layer in a display panel in the embodiment of the application, Figures 8 to 13 is a flowchart of a preparation method of a cathode in a display panel in the embodiment of the application.

[0047] To solve the above technical problems, referring to Figure 1 , the application provides a display panel, which comprises 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 in a spaced manner, the pixel definition layer 30 covers part of the anode 21 on both sides, the pixel definition layer 30 protrudes from the substrate 10 to form a pixel opening, the isolation structure 40 comprises a main body part 41 and a shielding part 42, and the shielding part 42 is arranged protruding to the two side walls of the main body part 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 and the substrate 10 have the same evaporation angle, 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 arranged on the organic light-emitting layer 22 by a second evaporation source 2, and in the evaporation direction, the two sides of the second evaporation source 2 and the substrate 10 have different evaporation angles, the evaporation angle between one side of the second evaporation source 2 and the substrate 10 is set to a second angle θ2, 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 greater than the first angle θ1. Wherein, under the shielding effect of the shielding part 42, the first evaporation source 1 has a first shadow area S1 when the first angle θ1, the second evaporation source 2 has a second shadow area S2 when 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 sum, and the width of the pixel definition layer 30 is greater than or equal to the width sum.

[0048] like Figure 1 As shown, during vapor deposition, since the spray path of the vapor deposition source is fan-shaped, the edge of the fan cannot be directly vapor-deposited onto the substrate due to the blocking effect of the blocking part 42. Therefore, the blocked area is called the blocking area. Figure 1 The normals of the substrate 10 are also shown. The normals of the substrate 10 include two normals that coincide with the two endpoints of the shielding portion 42. The area between the normal on the same side and the first vapor deposition source 1 on the same side is the first shadow area S1. The area between the normal on the right side of the shielding portion 42 and the right side of the first vapor deposition source 1 is the first shadow area S1. The area between the normal on the left side of the shielding portion 42 and the left side of the second vapor deposition source 2 is the second shadow area S2. The area between the normal on the right side of the shielding portion 42 and the right side of the second vapor deposition source 2 is the third shadow area S3.

[0049] In this embodiment, as Figure 1 As shown, under the blocking effect of the blocking part 42, the first evaporation source 1 has a first shadow region S1 when it is at a first angle θ1, and the second evaporation source 2 has a second shadow region S2 when it is at a second angle θ2. The width of the blocking part 42, the width of the first shadow region S1, and the width of the second shadow region S2 have a sum of widths, and the width of the pixel definition layer 30 is greater than or equal to the sum of widths. Thus, when the first evaporation source 1 has a first angle θ1, the orthographic projections of the organic light-emitting layer 22 and the pixel definition layer 30 on the substrate 10 can be made to coincide, 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 orthographic projections of the cathode 23 and the pixel definition layer 30 on the substrate 10 can coincide, 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. Under 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 aperture, thereby improving the pixel aperture ratio.

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

[0051] In some embodiments, the material of the anode 21 includes metal oxides and metals, and the metal oxides generally include indium tin oxide and indium zinc oxide, etc. The spaced anodes 21 can individually power different sub-pixels 20. The fabrication method of the anode 21 is not limited here, and can be selected according to actual needs.

[0052] In some embodiments, each pixel opening is provided with one sub-pixel 20, and the size of the pixel opening determines the light transmittance of the pixel, which plays a crucial role in the performance of the display panel. The shape of the pixel opening determines the shape of the sub-pixel 20, i.e., 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 can be selected according to actual needs.

[0053] In some embodiments, referring to Figure 1 , 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 main body part 41 having electrical conductivity and a shielding part 42 having insulation. The main body part 41 can achieve electrical connection between the anodes 21 of different sub-pixels 20 while having an isolation effect. The shielding part 42 can play a shielding role during the evaporation of the sub-pixel 20 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] As shown in Figure 1 , a single isolation structure 40 and the pixel openings on both sides of the isolation structure 40 are shown, which are mainly illustrated in the structure. A single isolation structure 40 can surround multiple pixel openings, and the sub-pixels 20 in the multiple pixel openings surrounded by the single isolation structure 40 correspond to the same color pixel to avoid pixel crosstalk. The isolation structure 40 can also be other structures, which are not limited here and can be selected according to actual needs.

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

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

[0057] like Figure 2 and Figure 7 As shown, the first vapor deposition source 1 sprays in a fan shape, and both sides of the first vapor deposition source 1 have the same vapor deposition angle with the substrate 10, that is, the angle between the two edges of the spray path and the substrate 10 is the same. This allows the same shaded area to be formed on both sides of the isolation structure 40, ensuring that the organic light-emitting layer 22 on both sides of the isolation structure 40 is at the same distance from the isolation structure 40. When vapor deposition is performed at the first angle θ1, the organic light-emitting layer 22 does not contact the isolation structure 40. This requires a reasonable design of the protrusion width of the shielding part 42 and the spray range of the first vapor deposition source 1, which can be obtained through calculation.

[0058] Furthermore, the cathode 23 of the sub-pixel 20 is formed in the pixel opening by 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 as the second angle θ2, and the evaporation angle between the other side of the second evaporation source 2 and the substrate 10 is set as 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. The cathode 23 is at least in contact with the isolation structure 40 on the side corresponding to the second angle θ2.

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

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

[0061] If one side of the second vapor deposition source 2 is the left side, then the other side of the second vapor deposition source 2 is the right side. It is understood that defining the two sides of the second vapor deposition source 2 as the left and right sides is only for the convenience of illustrating the embodiment, and is not a specific limitation thereof.

[0062] The first vapor deposition source 1 and the second vapor deposition source 2 can be sprayed using the same nozzle device 50 or using different nozzle devices 50. This embodiment mainly describes spraying using the same nozzle device 50. When spraying using the same nozzle device 50, the nozzle device 50 needs to be adjusted after the first vapor deposition source 1 has finished spraying to change the vapor deposition angle.

[0063] like Figure 8 and Figure 13 As shown, during the evaporation process, the right side of the second evaporation source 2 reaches the pixel opening first, gradually leading to the left side reaching the pixel opening, thus forming a film structure of suitable 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. However, since the uncovered portion is located on the pixel definition layer 30, it will not affect the light transmittance of the sub-pixel 20. Because the third angle θ3 is larger, the second angle θ2 will be smaller, resulting in more cathode 23 material being deposited on the main body 41 of the isolation structure 40 on the right side. This allows the cathode 23 to 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, such as Figure 1 As shown, in one pixel opening, the cathode 23 does not contact the sidewall of the main body 41; in the adjacent pixel opening, the cathode 23 is in contact with the sidewall 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 sidewall 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 disposed between the cathode 23 and the anode 21, enabling normal display of each sub-pixel 20 while reducing the voltage drop of the display panel.

[0065] In some embodiments, such as Figure 1As shown, the second evaporation source 2 has a third shadow area S3 when the third angle θ3 is under the shielding effect of the shielding part 42. In the length direction of the substrate 10, the isolation structure 40 has a first side 401 and a second side 402. In the first side 401, the end of the pixel definition layer 30 and the end of the shielding part 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. In the second side 402, the end of the pixel definition layer 30 and the end of the shielding part 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 less than the first angle θ1, the second shadow area S2 formed is greater than the third shadow area S3. Therefore, the first distance D1 is set to be greater than the second distance D2, so that the cathode 23 material can be formed on the pixel definition layer 30 during evaporation on both sides of the isolation structure 40. Thus, the prerequisite for the cathode 23 to be overlapped with the isolation structure 40 is met, 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 by the same spray head device 50, and the evaporation angle of the first evaporation source 1 and the second evaporation source 2 is changed by adjusting the spray head device 50, so that the second angle θ2 is less than the first angle θ1, and the third angle θ3 is greater than the first angle θ1.

[0067] In some embodiments, the spray head device 50 is a power device for spraying the first evaporation source 1 and the second evaporation source 2 on the substrate to form the above-mentioned fan-shaped spray, wherein the range, speed, pressure and other parameters of the spray determine the film quality. The parameters of the spray head device 50 are not specifically limited here and can be selected according to actual needs.

[0068] In some embodiments, the spray head device 50 includes a spray head 51 and a baffle 52. When the spray head device 50 is adjusted, the evaporation angle of the first evaporation source 1 and / or the second evaporation source 2 can be changed by adjusting the whole spray head device 50, or by adjusting the spray head 51 or the baffle 52 of the spray head device 50. In this embodiment, the change of the baffle 52 is mainly described in detail.

[0069] Referring to Figures 14 to 17 , Figure 14 is a flowchart of the process of forming an organic light-emitting layer and a cathode by the spray head device in the embodiment of the application; Figure 15 is a structural diagram of the spray head device for evaporating an organic light-emitting layer in the embodiment of the application; Figure 16 is a structural diagram of the spray head device for evaporating a cathode in the embodiment of the application; Figure 17 is a diagram showing the corresponding relationship between the spray angle and the film thickness in the embodiment of the application.

[0070] In some embodiments, the evaporation angle of the first evaporation source 1 and the second evaporation source 2 is changed by adjusting the showerhead device, specifically including the following steps S710 to S730.

[0071] Step S710: In the length direction of the substrate 10, the showerhead 51 and the isolation structure 40 have corresponding fifth and sixth sides, and the baffle 52 is arranged between the fifth and sixth sides of the showerhead 51, and the baffle 52 is protrudingly arranged from the showerhead 51 towards the substrate 10.

[0072] As shown in Figure 15 and Figure 16 , the showerhead 51 has corresponding fifth and sixth sides with the first side 401 and the second side 402 of the isolation structure 40, respectively, that is, when the showerhead 51 coincides with the center line of the isolation structure 40, the first side 401 of the isolation structure 40 and the fifth side of the showerhead 51 are on the same side, and the second side 402 of the isolation structure 40 and the sixth side of the showerhead 51 are on the same side.

[0073] As shown in Figure 14 and Figure 16 , the exit port of the showerhead 51 is located between the two baffles 52, the baffles 52 are protrudingly arranged from the showerhead 51 towards the substrate 10, and the sprayed evaporation source is limited in its spray angle by the two baffles 52, so that the evaporation source can be sprayed according to the expected spray path.

[0074] Step S720: When forming the organic light-emitting layer 22 of the sub-pixel 20 by the first evaporation source 1, the protruding height of the baffle 52 on the fifth side and the protruding height of the baffle 52 on the sixth side are the same, and are configured to be the first height H1.

[0075] As shown in Figure 15 , when the organic light-emitting layer 22 is evaporated, the protruding height of the baffle 52 on the fifth side and the protruding height of the baffle 52 on the sixth side are the same, so that the same evaporation angle can be obtained 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] As shown in Figure 17 , in the corresponding relationship between the spray angle and the film thickness, when the evaporation angle changes from 0 degrees to 180 degrees, the film thickness first increases and then decreases, and the corresponding relationship between the two is a parabolic change. The film thickness is the smallest at 0 degrees and 180 degrees, and the film thickness is the largest at 90 degrees. By adjusting the spray angle through such a corresponding relationship, the corresponding film thickness can be obtained. The spray angle and the evaporation angle are complementary angles.

[0077] Step S730: as shown in Figure 16As shown, when the cathode 23 of the sub-pixel 20 is formed by the second evaporation source 2, the protrusion height of the fifth-side baffle 52 is configured as the second height H2, and the protrusion height of the sixth-side baffle 52 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. This allows the second angle θ2 to be less than the first angle θ1, and the third angle θ3 to be greater than the first angle θ1. The specific angles and film thickness are selected according to the corresponding relationship.

[0078] In some embodiments, such as Figure 18 As shown, the structure includes three sub-pixels 20 arranged in a mutually arranged manner, wherein the three sub-pixels 20 are a red sub-pixel, a blue sub-pixel, and a green sub-pixel. 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 defining layer 30 and the end of the blocking portion 42 have a third distance D3; on the fourth side 404, the end of the pixel defining layer 30 and the end of the blocking 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 is possible to selectively overlap the cathode 23 with the main body 41 of the isolation structure 40 as needed.

[0079] In some embodiments, the baffle 52 protrudes from the nozzle 51 toward the substrate 10, so that the nozzle 51 forms notches on the third side 403 and the fourth side 404. On the third side 403 and the fourth side 404, the first vapor deposition source 1 and the second vapor deposition source 2 have the same vapor deposition angle at the notch, and the vapor deposition angle of the first vapor deposition source 1 and the second vapor deposition 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 vapor deposition source sprays onto the substrate from the notch, forming 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 widths 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 widths of the cathode 23 on the first side 401 and the second side 402, thereby increasing the pixel aperture and improving the pixel aperture ratio. Specifically, the difference between the first distance D1 and the second distance D2 is greater than or equal to 0.5 nm.

[0080] This application also provides a method for manufacturing a display panel, referring to... Figures 2 to 13 , Figure 19 Specifically, it includes the following steps S100 to S600.

[0081] Step S100: Provide a substrate 10.

[0082] Step S200: Forming anodes 21 of sub-pixels 20 on the substrate 10, the anodes 21 are arranged at intervals. The preparation method of the anodes 21 is not limited here, and is selected according to actual needs.

[0083] Step S300: Forming a pixel definition layer 30 on the intervals of the anodes 21, the two sides of the pixel definition layer 30 cover part of the anodes 21, and the pixel definition layer 30 protrudes 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 are selected according to actual needs.

[0084] Step S400: Forming an isolation structure 40 on the pixel definition layer 30, the isolation structure 40 includes a main body part 41 and a shielding part 42, and the shielding part 42 is arranged protruding to the two side walls of the main body part 41.

[0085] Step S500: Forming an organic light-emitting layer 22 of the sub-pixel 20 in the pixel opening by a first evaporation source 1, in the evaporation direction, 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, so that the organic light-emitting layer 22 does not contact the isolation structure 40.

[0086] Step S600: Forming a cathode 23 of the sub-pixel 20 in the pixel opening by a 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, one side of the second evaporation source 2 has an evaporation angle with the substrate 10 set to a second angle θ2, and the other side of the second evaporation source 2 has an evaporation angle with the substrate 10 set to a third angle θ3, the second angle θ2 is smaller than the first angle θ1, and the third angle θ3 is greater than the first angle θ1, and at least the side corresponding to the second angle θ2 is arranged to make the cathode 23 contact the isolation structure 40.

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

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

[0089] In this application, unless otherwise clearly specified and limited, the terms "set", "connected", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0090] In the description of the present specification, the description referring to the terms "some embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments are contained in at least one embodiment of the present application. In the present specification, the illustrative description 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 appropriate manner in any one or more embodiments or examples. Furthermore, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art 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 limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and specification of the present application shall be within the scope of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate; an anode, which is spaced apart on the substrate; a pixel definition layer, which covers part of the anode on both sides, and protrudes from the substrate to form a pixel opening; an isolation structure, which comprises a main body and a shielding part, and the shielding part protrudes from both side walls of the main body; an organic light-emitting layer, which is deposited on the anode by a first evaporation source, and the evaporation angle between both sides of the first evaporation source and the substrate is the same, and the evaporation angle of the first evaporation source is set to a first angle; a cathode, which is provided on the organic light-emitting layer by a second evaporation source, and in the evaporation direction, the evaporation angles between both sides of the second evaporation source and the substrate are different, 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 the first angle is the first angle, and the second evaporation source has a second shadow area when the second angle is the 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 sum, and the width of the pixel definition layer is greater than or equal to the width sum.

2. The display panel of claim 1, wherein, In one of the pixel openings, the cathode does not contact 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 of claim 1, wherein, In the pixel opening, the organic light-emitting layer extends from the anode to the pixel definition layer, and the organic light-emitting layer does not contact the side wall of the main body.

4. The display panel of claim 1, wherein: under the shielding effect of the shielding part, the second evaporation source has a third shadow area when the third angle is the 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 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; and the first distance is greater than the second distance.

5. The display panel of claim 4, wherein: the first evaporation source and the second evaporation source are ejected by 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 of claim 5, wherein, the evaporation angles of the first evaporation source and the second evaporation source are changed by adjusting the nozzle device, which comprises: The nozzle device comprises a nozzle and a baffle. In the length direction of the substrate, the nozzle has a fifth side and a sixth side corresponding to the first side and the second side of the isolation structure respectively, and the baffle is arranged between the fifth side and the sixth side of the nozzle and protrudes from the nozzle towards the substrate. When the organic light-emitting layer is formed by the first evaporation source, the protruding height of the baffle on the fifth side is the same as the protruding height of the baffle on the sixth side, and is configured as a first height. When the cathode is formed by the second evaporation source, the protruding height of the baffle on the fifth side is configured as a second height, the protruding height of the baffle on the sixth 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 of claim 5, wherein In the width direction of the substrate, the isolation structure has a third side and a fourth side. In the third side, the end of the pixel definition layer and the end of the shielding part have a third distance. In the fourth side, the end of the pixel definition layer and the end of the shielding part 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 of claim 7, wherein The nozzle device comprises a nozzle and a baffle. In the length direction of the substrate, the nozzle has a fifth side and a sixth side corresponding to the first side and the second side of the isolation structure respectively, and the baffle is arranged between the fifth side and the sixth side of the nozzle and protrudes from the nozzle towards the substrate. In the third side and the fourth side, the first evaporation source and the second evaporation source have the same evaporation angle in the gap. The evaporation angle of the first evaporation source and the second evaporation source in the gap is set as a fourth angle, and the fourth angle is between the first angle and the third angle.

9. The display panel of claim 4, wherein, The difference between the first distance and the second distance is greater than or equal to 0.5 nm.

10. A method for manufacturing a display panel, characterized by, Comprising: providing a substrate; forming anodes of sub-pixels on the substrate, the anodes being arranged at intervals; forming a pixel definition layer on the intervals of the anodes, both sides of the pixel definition layer covering part of the anodes, and the pixel definition layer protruding from the substrate to form a pixel opening; forming an isolation structure on the pixel definition layer, the isolation structure comprising a main part and a shielding part, and the shielding part protruding from both side walls of the main part; forming an organic light-emitting layer of the sub-pixels in the pixel opening by a first evaporation source. In the evaporation direction, both sides of the first evaporation source and the substrate have the same evaporation angle. The evaporation angle of the first evaporation source is set as a first angle, so that the organic light-emitting layer does not contact the isolation structure. The cathode of the sub-pixel is formed by a second evaporation source in the pixel opening, and in the evaporation direction, the evaporation angle between the two sides of the second evaporation source and the substrate is different, the evaporation angle between one side of the second evaporation source and the substrate is set as a second angle, the evaporation angle between the other side of the second evaporation source and the substrate is set as a third angle, the second angle is smaller than the first angle, and the third angle is larger than the first angle, and the cathode is arranged to contact the isolation structure at least 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 the first angle is the first angle, and the second evaporation source has a second shadow area when the second angle is the 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 sum, and the width of the pixel definition layer is greater than or equal to the width sum.

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