Display panel and preparation method thereof, evaporation equipment and display device

Abstract

The invention provides a display panel and a preparation method thereof, evaporation equipment and a display device, the display panel comprises a substrate and an isolation structure and at least one light-emitting unit which are located on one side of the substrate, the isolation structure at least comprises a supporting part, the light-emitting unit is located in an isolation opening and comprises a first functional layer, and the first functional layer comprises a film thickness decreasing area; in the direction perpendicular to the plane where the substrate is located, the distance between the end, away from the substrate, of the supporting part and the end, close to the substrate, of the supporting part is the first height, in the direction parallel to the plane where the substrate is located and pointing to the isolation structure from the light-emitting unit, the width of the film thickness decreasing area is the first width, and the first width is smaller than or equal to 1.3 times of the first height; lateral electric leakage of the light-emitting unit is reduced, and the low-gray-scale optical performance of the display panel is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a preparation method thereof, an evaporation device, and a display apparatus. Background Art

[0002] Organic Light-Emitting Diode (OLED) is an organic thin film electroluminescent unit. It has attracted great attention and is widely used in electronic display products due to its advantages such as simple preparation process, low cost, low power consumption, high brightness, wide viewing angle, high contrast and flexible display.

[0003] However, current electronic display products are limited by their own structural design and are difficult to meet user needs. Summary of the invention

[0004] In view of this, the purpose of the present disclosure is to provide a display panel and a preparation method thereof, an evaporation device, and a display device, wherein the display panel can reduce the risk of lateral leakage and improve the low grayscale color mixing phenomenon.

[0005] Based on the above objectives, the present disclosure discloses a display panel in a first aspect, the display panel comprising:

[0006] substrate;

[0007] an isolation structure, located at one side of the substrate, the isolation structure comprising a crown portion and a support portion which are stacked, the crown portion being located at a side of the support portion away from the substrate, and an orthographic projection of the support portion on the substrate being within the range of an orthographic projection of the crown portion on the substrate;

[0008] At least one light-emitting unit, which is on the same side of the substrate as the isolation structure, wherein the light-emitting unit comprises a first functional layer, and the first functional layer comprises a film thickness reduction region;

[0009] Along a direction perpendicular to the surface where the substrate is located, a distance between an end of the support portion away from the substrate and an end of the support portion close to the substrate is a first height, and along a direction parallel to the surface where the substrate is located and pointing from the light-emitting unit to the isolation structure, a width of the film thickness reduction area is a first width, and the first width is less than or equal to 1.3 times the first height;

[0010] The display panel has a plurality of cross-sections passing through the center of the light-emitting unit and perpendicular to the surface where the substrate is located. In any of the cross-sections, a first straight line defined by an edge of the support portion on a side close to the substrate and an edge of the crown portion forms a third angle with the surface where the substrate is located, and a second straight line defined by an edge of the first functional layer and an edge of the crown portion forms a fourth angle with the surface where the substrate is located, and the fourth angle is greater than the third angle.

[0011] In one embodiment, the first width is greater than or equal to 0.8 times the first height.

[0012] In one embodiment, along the direction in which the first functional layer extends away from the light-emitting unit, the film thickness decreasing region sequentially includes a continuous first film layer and a second film layer, the minimum film thickness of the first film layer is equal to the maximum film thickness of the second film layer, the film thickness of the first film layer and the film thickness of the second film layer gradually decrease along the direction in which the first functional layer extends away from the light-emitting unit, and a first angle between a tangent line of a surface of the first film layer away from the substrate and a surface where the substrate is located is greater than a second angle between a tangent line of a surface of the second film layer away from the substrate and a plane where the substrate is located;

[0013] Preferably, the first angle is between 0° and 90°;

[0014] Preferably, the first angle includes one of 60°, 70° and 80°;

[0015] Preferably, the thickness of the second film layer at one end away from the first film layer is equal to 0;

[0016] Preferably, the first width is the distance between an edge of the first film layer away from the second film layer and an edge of the second film layer away from the first film layer.

[0017] In one embodiment, the first functional layer also includes a film thickness flatness area, which is located on a side of the first film layer away from the second film layer, and the film thickness flatness area is continuous with the first film layer, and along a direction perpendicular to the surface of the substrate, the film thickness of the first film layer is smaller than the film thickness of the film thickness flatness area.

[0018] In one embodiment, the isolation structure further comprises a crown portion, the crown portion is located on a side of the support portion away from the substrate, and the orthographic projection of the support portion on the substrate is located within the orthographic projection range of the crown portion on the substrate;

[0019] Along the direction perpendicular to the surface of the substrate, the film thickness in the flat area of ​​the film thickness is the first thickness, the positive projection point of the edge of the crown on the first film layer is the first projection point, the thickness of the first film layer at the first projection point is the second thickness, and the second thickness is less than or equal to 3 / 5 times the first thickness and greater than or equal to 2 / 5 times the first thickness.

[0020] In one embodiment, the light-emitting unit further includes a second functional layer, the first functional layer includes a first sub-functional layer, and at least one second functional layer is disposed on a side of the first sub-functional layer away from the substrate;

[0021] Preferably, the first sub-functional layer comprises a hole transport layer;

[0022] Preferably, the first functional layer further comprises a second sub-functional layer, the second sub-functional layer is located on a side of the first sub-functional layer away from the substrate, at least one layer of the second functional layer is provided between the second sub-functional layer and the first sub-functional layer, and / or at least one layer of the second functional layer is provided on a side of the second sub-functional layer away from the substrate;

[0023] Preferably, the second sub-functional layer comprises a luminescent material layer;

[0024] Preferably, the conductivity of the first functional layer is greater than the conductivity of the second functional layer;

[0025] Preferably, the orthographic projection point of the edge of the crown on the second functional layer is the second projection point, along the direction parallel to the surface where the substrate is located, the distance between the second projection point and the edge of the second functional layer is the second length, the distance between the first projection point and the edge of the first functional layer is the first length, and the second length is greater than the first length.

[0026] In one embodiment, the display panel further comprises a pixel defining layer, the isolation structure is located on a side of the pixel defining layer away from the substrate, the pixel defining layer is provided with at least one pixel opening, and the light emitting unit is located in the pixel opening;

[0027] Preferably, the isolation structure encloses at least one isolation opening, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the isolation opening on the substrate;

[0028] Preferably, the first functional layer extends to a position between the pixel opening and the supporting portion, and is located on a side of the pixel defining layer away from the substrate;

[0029] Preferably, the film thickness reduction area is located between the pixel opening and the support portion;

[0030] Preferably, part of the film thickness flat area is located between the pixel opening and the supporting portion.

[0031] In one embodiment, the fourth angle is between 50° and 70°, and the sum of the third angle and the fourth angle is less than 90°;

[0032] Preferably, the fourth angle includes one of 55°, 60°, and 65°;

[0033] Preferably, the fourth angle is an angle formed by a second straight line determined by an edge of the second film layer away from the first film layer and an edge of the crown, and the surface where the substrate is located;

[0034] Preferably, the length of the first straight line is equal to the shortest distance between the edge of the support portion close to the substrate and the edge of the crown, and the length of the second straight line is equal to the shortest distance between the edge of the second film layer away from the first film layer and the edge of the crown.

[0035] In one embodiment, the support portion includes a first support layer and a second support layer that are stacked, the second support layer is located on a side of the first support layer away from the substrate, the orthographic projection of the second support layer on the substrate is located within the orthographic projection range of the first support layer on the substrate, and the first support layer and the second support layer both include conductive materials;

[0036] Preferably, the edge of the first supporting layer is the edge of the supporting portion close to the substrate;

[0037] Preferably, the first straight line is a straight line defined by an edge of the first supporting layer and an edge of the crown;

[0038] Preferably, the first supporting film layer and the second supporting film layer are made of different materials;

[0039] Preferably, the first supporting film layer comprises molybdenum, and the second supporting film layer comprises aluminum.

[0040] A second aspect of the present disclosure provides a method for preparing a display panel, the method comprising the following steps:

[0041] providing a substrate;

[0042] preparing a support portion on one side of the substrate;

[0043] A crown portion is prepared on a side of the support portion away from the substrate, wherein the orthographic projection of the support portion on the substrate is within the range of the orthographic projection of the crown portion on the substrate;

[0044] At least one light-emitting unit is prepared on the same side of the substrate, wherein the light-emitting unit includes a first functional layer, and the first functional layer extends toward a direction close to the support portion;

[0045] The display panel has a plurality of cross-sections passing through the center of the light-emitting unit and perpendicular to the surface where the substrate is located. In any of the cross-sections, a first straight line defined by an edge of the support portion close to the substrate and an edge of the crown portion forms a third angle with the surface where the substrate is located, and a second straight line defined by an edge of the first functional layer and an edge of the crown portion forms a fourth angle with the surface where the substrate is located, and the fourth angle is greater than the third angle.

[0046] In one embodiment, the first functional layer is formed on the substrate by an evaporation process, and the fourth angle is between 50° and 70°;

[0047] Preferably, the fourth angle includes one of 55°, 60°, and 65°.

[0048] In one embodiment, preferably, before preparing the support portion on one side of the substrate, the method further includes:

[0049] Prepare a pixel defining layer on one side of the substrate;

[0050] Patterning the pixel defining layer to form at least one pixel opening;

[0051] Preferably, the step of preparing a support portion on one side of the substrate comprises:

[0052] Prepare the support portion on a side of the pixel defining layer away from the substrate;

[0053] Preferably, preparing at least one light-emitting unit on the same side of the substrate comprises:

[0054] The at least one light emitting unit is prepared in the at least one pixel opening on the same side of the substrate.

[0055] A third aspect of the present disclosure provides an evaporation device, which is applied to the preparation of the first functional layer in the above-mentioned method for preparing a display panel, and the evaporation device comprises:

[0056] A crucible having a cavity for containing an evaporation material;

[0057] An evaporation source is located at one side of the crucible, and the evaporation source is connected to the crucible;

[0058] The angle limiting component is detachably arranged at the periphery of the outlet of the evaporation source. The end of the angle limiting component away from the evaporation source is provided with an evaporation hole, and the evaporation hole is used to limit the evaporation range of the evaporation material.

[0059] In one embodiment, the angle limiting component comprises:

[0060] A first limiting portion, wherein the evaporation hole is located at the center of the first limiting portion;

[0061] A second limiting portion is located on a side of the first limiting portion close to the evaporation source, the second limiting portion has a first through hole connected to the evaporation hole, the aperture of the first through hole is larger than the aperture of the evaporation hole, and the second limiting portion is used to limit the diffusion range of the evaporation material;

[0062] Preferably, the shape of the evaporation hole includes a circle;

[0063] Preferably, the orthographic projection of the first through hole on the first limiting portion covers the evaporation hole;

[0064] Preferably, along the direction from the evaporation source to the evaporation hole, the aperture of the first through hole gradually increases;

[0065] Preferably, an angle formed between a line connecting the evaporation source and the edge of the evaporation hole and the evaporation surface is a fourth angle, and the fourth angle is between 50° and 70°;

[0066] Preferably, the fourth angle includes one of 55°, 60°, and 65°.

[0067] A fourth aspect of the present disclosure provides a display device, which includes the display panel described above.

[0068] Compared with the prior art, the present invention limits the width of the film thickness reduction area in the first functional layer to be less than 1.3 times the height of the supporting portion, so that the first functional layer and the supporting portion in the isolation structure are not in contact and there is a gap between the two. The isolation structure completely isolates the first functional layer, avoids lateral leakage of the light-emitting unit, and improves the low grayscale optical performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0070] Figure 1A schematic cross-sectional view of a display panel provided in the first aspect of the present disclosure;

[0071] Figure 2 for Figure 1 A top view of

[0072] Figure 3 for Figure 1 A magnified schematic diagram of part A;

[0073] Figure 4 A partial schematic diagram of a light-emitting unit of a display panel provided in the first aspect of the present disclosure;

[0074] Figure 5 A partial schematic diagram of a first functional layer of a display panel provided in the first aspect of the present disclosure;

[0075] Figure 6 for Figure 5 A magnified schematic diagram of part B;

[0076] Figure 7 A schematic cross-sectional view of a portion of the first functional layer provided in the first aspect of the present disclosure;

[0077] Figure 8 A schematic flow chart of a method for preparing a display panel provided in the second aspect of the present disclosure;

[0078] Fig. 9 A schematic cross-sectional view of a vapor deposition device provided in the third aspect of the present disclosure;

[0079] Fig.10 A top view of the evaporation equipment provided in the third aspect of the present disclosure. DETAILED DESCRIPTION

[0080] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0081] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0082] The inventor of the application discovered the following problems in the relevant technology during long-term practical work: in the display panel, the hole injection layer (Hole Inject Layer, HIL) is the main film layer causing cross-current. During evaporation, the edge of the hole injection layer is easily overlapped with the isolation structure and the auxiliary cathode part, resulting in serious lateral leakage, which in turn causes the low grayscale optical performance of the display panel to deteriorate, affecting the quality of the product.

[0083] Next join Figure 1-Figure 7The display panel provided by the present disclosure is described as follows; the display panel includes a substrate 10, an isolation structure 30 and at least one light-emitting unit 20, the isolation structure 30 is located on one side of the substrate 10, the isolation structure 30 encloses at least one isolation opening 310, the isolation structure 30 is stacked and includes a crown 31 and a support portion 32, the crown 31 is located on a side of the support portion 32 away from the substrate 10, and the orthographic projection of the support portion 32 on the substrate 10 is located within the range of the orthographic projection of the crown 31 on the substrate 10; the light-emitting unit 20 and the isolation structure 30 are located on the substrate 10. 0, the light-emitting unit 20 includes a first functional layer 21, and the first functional layer 21 includes a film thickness reduction area m, wherein, along a direction perpendicular to the surface of the substrate 10 (Z direction), a distance between an end of the support portion 32 away from the substrate 10 and an end of the support portion 32 close to the substrate 10 is a first height h1, and along a direction parallel to the surface of the substrate 10 and pointing from the light-emitting unit 20 to the isolation structure 30, a width of the film thickness reduction area m is a first width L1, and the first width L1 is less than or equal to 1.3 times the first height h1, and greater than or equal to The first functional layer 21 is 0.7 times the first height h1, that is, 0.7h1≤L1≤1.3h1, so that the first functional layer 21 and the support portion 32 in the isolation structure 30 are not in contact and there is a gap between the two. The isolation structure 30 completely isolates the first functional layer 21, avoids lateral leakage of the light-emitting unit, and improves the low grayscale optical performance of the display panel. The display panel has a plurality of sections passing through the center of the light-emitting unit 20 and perpendicular to the surface where the substrate 10 is located. In any section, the edge of the support portion 32 close to the substrate 10 and the edge of the crown 31 are The first straight line p1 determined, forms a third angle a3 with the surface where the substrate 10 is located, the second straight line p2 determined by the edge of the first functional layer 21 and the edge of the crown 31, forms a fourth angle a4 with the surface where the substrate 10 is located, the third angle a3 is smaller than the fourth angle a4, so that the first functional layer 21 in the isolation opening 310 does not contact the supporting portion 32 in the isolation structure 30 on each plane and there is a gap between the two, thereby further avoiding lateral leakage of the light-emitting unit and improving the low grayscale optical performance of the display panel.

[0084] The composition, preparation and other contents of the isolation structure (or partition structure or isolation column) mentioned below are described in patents CN118251982A, 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, PCT / CN2024 / 0 99072, CN117979755A, CN117998900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A for reference.

[0085] refer to Figure 5-Figure 7In a specific embodiment, since the orthographic projection of the support portion 32 of the isolation structure on the substrate 10 is within the range of the orthographic projection of the crown portion 31 on the substrate 10, the isolation structure 30 presents an eaves structure, and there will be an evaporation shadow area during evaporation. For example, when evaporating the first functional layer 21, a film thickness decrease area m of the first functional layer 21 is formed in the evaporation shadow area. It should be noted that in the present application, the film thickness decrease area m is not only limited to the first functional layer being in a decreasing state in this area, but also includes a state in which the first functional layer has a small increase during the decreasing process. Along the direction in which the first functional layer 21 extends away from the light-emitting unit 20, the film thickness decreasing area includes the continuous first film layer 211 and the second film layer 212 in sequence. The film thickness of the first film layer 211 and the film thickness of the second film layer 212 gradually decrease along the direction in which the first functional layer 21 extends away from the light-emitting unit 20. Along the direction perpendicular to the surface where the substrate 10 is located (Z direction), the cross section of the first functional layer 21 includes the tangent b1 of the surface of the first film layer 211 away from the substrate 10 and the tangent b2 of the surface of the second film layer away from the substrate; the cross section of the first functional layer 211 passes through the center of the light-emitting unit 20 where it is located; the tangent b1 of the surface of the first film layer 211 away from the substrate 10 1 and the surface where the substrate 10 is located is greater than a second angle a2 between a tangent line b2 of the surface of the second film layer 212 away from the substrate 10 and the plane where the substrate 10 is located. Further, the first angle a1 is between 0-90°. Further, the first angle a1 includes one of 60°, 70°, and 80°. The tangent line b2 of the surface of the second film layer 212 away from the substrate 10 is parallel or approximately parallel to the surface where the substrate 10 is located. The film thickness of the second film layer 212 at one end away from the first film layer 211 is equal to 0, and the film thickness of the second film layer 212 at one end close to the first film layer 211 is equal to or approximately equal to the film thickness of the second film layer 212 at one end away from the first film layer 211. That is, the thickness decreasing rate of the first film layer 211 is greater than the thickness decreasing rate of the second film layer 212. In the present disclosure, the thickness of the first functional layer 21 decreases rapidly at the first film layer 211, which is beneficial for the entire thickness of the second film layer 212 to approach 0, so that the first functional layer 21 and the isolation structure 30 are not in contact and there is a gap between the two. The isolation structure 30 completely isolates the first functional layer and avoids lateral leakage of the light-emitting unit 20, thereby achieving the effect of reducing lateral leakage of the light-emitting unit 20 and improving the low grayscale optical performance of the display panel.

[0086] refer to Figure 5In a specific embodiment, the fourth angle a4 is between 50° and 70°, and the sum of the third angle a3 and the fourth angle a4 is less than 90. Further, the fourth angle includes one of 55°, 60°, and 65°. Specifically, the fourth angle a4 here is the angle formed by the second straight line p2 determined by the edge of the second film layer 212 away from the first film layer 211 and the edge of the crown 31, and the surface where the substrate 10 is located, wherein the length of the first straight line p1 is equal to the shortest distance between the edge of the side of the support portion 32 close to the substrate 10 and the edge of the crown 31, and the length of the second straight line p2 is equal to the shortest distance between the edge of the second film layer 212 away from the first film layer 211 and the edge of the crown 31. The fourth angle a4 in this embodiment is equivalent to the evaporation angle of the first functional layer 21, that is, the evaporation angle of the first functional layer 21 is greater than the third angle a3, so that the edge of the first functional layer 32 is disconnected from the support portion 32, thereby achieving the effect of reducing lateral leakage of the light-emitting unit 20 and improving the low grayscale optical performance of the display panel.

[0087] refer to Figure 3 , Figure 5 and Figure 6 In a specific embodiment, the first functional layer 21 also includes a film thickness flat zone 213, which is located on the side of the first film layer 211 away from the second film layer 212, and the film thickness flat zone 213 is continuous with the first film layer 211, and the film thickness of the film thickness flat zone 213 is uniform. Along the direction perpendicular to the surface of the substrate 10 (Z direction), the film thickness of the first film layer 211 is less than the film thickness of the film thickness flat zone 213.

[0088] refer to Figure 6 In a specific embodiment, along the direction perpendicular to the surface of the substrate 10 (Z direction), the film thickness of the film thickness flat area 213 is the first thickness d1, the positive projection point of the edge of the crown 31 on the first film layer 21 is the first projection point O, and the film thickness of the first film layer 21 at the first projection point O is the second thickness d2, and the second thickness d2 is less than or equal to 3 / 5 times the first thickness d1, and greater than or equal to 2 / 5 times the first thickness d1, that is, 2 / 5d1≤d2≤3 / 5d1. This design is beneficial to controlling the film thickness decreasing speed of the first film layer 211 and preventing the second film layer 212 in the first functional layer 21 from extending to the isolation structure 30.

[0089] refer to Figure 3-Figure 4In a specific embodiment, the light-emitting unit further includes a second functional layer 22', the first functional layer 21 includes a first sub-functional layer, and at least one second functional layer 22' is provided on the side of the first sub-functional layer away from the substrate 10; the first sub-functional layer is a hole injection layer (HIL), the first functional layer further includes a second sub-functional layer (not shown in the drawings), the second sub-functional layer is located on the side of the first sub-functional layer away from the substrate 10, at least one second functional layer is provided between the second sub-functional layer and the first sub-functional layer, and / or, at least one second functional layer is provided on the side of the second sub-functional layer away from the substrate 10; the second sub-functional layer is a charge generation layer, wherein the charge generation layer (CGL) includes an N-type charge generation layer (N-CGL) and a P-type charge generation layer (P-CGL) stacked in sequence. The conductivity of the first functional layer 21 is greater than that of the second functional layer 22'; that is, the first functional layer 21 is a high-conductivity material layer with a relatively high conductivity. The positive projection point of the edge of the crown 31 on each second functional layer 22' is the second projection point P. Along the direction parallel to the surface of the substrate 10 (the X direction), the distance between the second projection point P and the edge of the second functional layer 22' is the second length L3. The distance between the first projection point O and the edge of the second film layer 212 is the first length L2. The second length L3 is greater than the first length L2. The first functional layer 21 is at the film The descending speed of the thick descending area m is greater than the descending speed of the second functional layer 22'. Since the first functional layer 21 has a higher conductivity and is easy to form a short circuit with the isolation structure, the first functional layer 21 needs to descend quickly in the film thickness descending area m to make the film thickness of the first functional layer 32 approach 0, avoiding the first functional layer 21 from overlapping with the support part 32 in the isolation structure 30, and there is a gap between the first functional layer 21 and the support part 32 in the isolation structure 30. The isolation structure 30 completely isolates the first functional layer 21, thereby avoiding lateral leakage of the light-emitting unit 20.

[0090] It should be noted that the light-emitting unit in this embodiment can be a single-layer OLED device or a stacked OLED device. Figure 3As shown, the first functional layer includes a first sub-functional layer, which is a hole injection layer (HIL), and the light-emitting unit 20 includes a hole transport layer 22 (HTL), an emitting layer (EML) 23, a hole blocking layer (HBL) 24, an electron transport layer 25 (ETL), and an electron injection layer (EIL) 26, which are sequentially stacked on the hole injection layer in a direction away from the substrate 10. It can be understood that the distance between the orthogonal projection point of the edge of the crown 31 on the hole injection layer and the edge of the hole injection layer is less than the distance between the orthogonal projection point of the edge of the crown 31 on each second functional layer (such as the hole transport layer 22, the emitting layer 23, the hole blocking layer 24, the electron transport layer 25, and the electron injection layer 26) and the edge of the corresponding second functional layer 22'. When the light-emitting unit is a stacked OLED device, the stacked OLED device is a device in which two or more light-emitting units are vertically stacked to form an OLED device, and each light-emitting unit is connected by a charge generating layer (CGL), that is, at least one functional layer includes a first sub-functional layer and a second sub-functional layer, wherein the first sub-functional layer is a hole injection layer, and the second sub-functional layer is a light-emitting material layer, specifically a charge generating layer (CGL), wherein the charge generating layer (CGL) includes an N-type charge generating layer (N-CGL) and a P-type charge generating layer (P-CGL) stacked in sequence, and the CGL layer is configured to generate carriers, transport carriers, and inject carriers to ensure that charges are effectively distributed to the light-emitting stack while improving the current efficiency in each light-emitting layer, and the second functional layer includes a first hole transport layer, a first light-emitting layer, and a first electron transport layer stacked in sequence on the hole injection layer, and a second hole transport layer, a second light-emitting layer, a second electron transport layer, and an electron injection layer stacked on the charge generating layer. Here, the distance between the orthogonal projection point of the edge of the crown 31 on the hole injection layer and the edge of the hole injection layer is equal to the distance between the orthogonal projection point of the edge of the crown 31 on the N-type charge generation layer (N-CGL) and the edge of the N-type charge generation layer (N-CGL), and is equal to the distance between the orthogonal projection point of the edge of the crown 31 on the P-type charge generation layer (P-CGL) and the edge of the P-type charge generation layer (P-CGL).It should be noted that the P-type charge generation layer (P-CGL), N-type charge generation layer (N-CGL) and hole transport layer (HTL) in the present embodiment are all high-conductivity material film layers with relatively large conductivity, so the distance between the projection point of the crown on the charge generation layer (CGL) and the edge of the charge generation layer (CGL) is also smaller than the other second lengths. This design avoids contact between the P-type charge generation layer, the N-type charge generation layer (N-CGL) and the hole transport layer (HTL) and the supporting part or the auxiliary cathode, avoids lateral leakage of the light-emitting unit, and thus improves the low grayscale optical performance of the display panel.

[0091] refer to Figure 3 In a specific embodiment, the light-emitting unit 20 further includes a first electrode 28 and a second electrode 27. The first electrode 28 is located on the side of the first functional layer 21 close to the substrate 10, and the second electrode 27 is located on the side of the first functional layer 21 away from the substrate 10. It should be noted that in this embodiment, one of the first electrode 28 and the second electrode 27 can be used as an anode, and the other can be used as a cathode to drive the light-emitting unit to emit light. For ease of description, the embodiment of the present application takes the second electrode 27 as the cathode of the display panel and the first electrode 28 as the anode of the display panel as an example.

[0092] refer to Figure 1 , Figure 3 and Figure 5In a specific embodiment, the support portion 32 is a conductive structure, the second electrode 27 is electrically connected to the support portion 32, and the crown portion 31 can be a conductive structure or a non-conductive structure. For example, the crown portion 31 can be an inorganic film layer or the crown portion can be a conductive material. For example, the conductive material of the crown portion 31 can be titanium. Further, the support portion 32 includes at least two film layers. Exemplarily, the support portion 32 includes a first support layer 321 and a second support layer 322 which are stacked. The second support layer 322 is located on a side of the first support layer 321 away from the substrate 10. The orthographic projection of the second support layer 322 on the substrate 10 is located within the orthographic projection range of the first support layer 321 on the substrate 10, and the orthographic projection of the first support layer 321 on the substrate 10 is located within the orthographic projection range of the crown 21 on the substrate 10, so that the second support layer 322 forms a concave structure relative to the first support layer 321 and the crown 21. On the one hand, the concave structure prevents excessive waste from entering other positions of the display panel when the second support layer 322 is etched. On the other hand, the first support layer 321 is protruded relative to the second support layer 322, which is beneficial to provide overlapping support for the second electrode 27 so that the second electrode 27 can be better electrically connected to the support portion 32. Furthermore, the edge of the first supporting layer 321 is the edge of the supporting portion 32 close to the substrate 10, and the first straight line p1 is a straight line determined by the edge of the first supporting layer 321 and the edge of the crown portion 31. Further, the first supporting layer 321 and the second supporting layer 322 both include conductive materials, and the materials of the first supporting layer 321 and the second supporting layer 322 are different. Further, the metal activity in the first supporting layer 321 is less than the metal activity in the second supporting layer 322. Exemplarily, the material of the second supporting layer 322 may be aluminum, and the material of the first supporting layer 321 may be molybdenum. Since the metal activity of aluminum is relatively large and the metal activity of molybdenum is relatively small and relatively stable, the material of the first supporting layer 321 is set to molybdenum to avoid lateral leakage of the light-emitting unit 20.

[0093] refer to Figure 2-Figure 3In a specific embodiment, the display panel further comprises a pixel defining layer 40, the isolation structure 30 is located on a side of the pixel defining layer 40 away from the substrate 10, that is, the pixel defining layer 40 is located between the isolation structure 30 and the substrate 10, the pixel defining layer 40 is provided with at least one pixel opening 410, the light emitting unit is located in the pixel opening, the pixel opening 410 is connected to the isolation opening 310, the orthographic projection of the pixel opening 410 on the substrate 10 is located within the orthographic projection of the corresponding isolation opening 310 on the substrate 10, further, the pixel defining layer 40 is arranged in the same layer as the first electrode 28, and the pixel defining layer 40 covers the gap between adjacent first electrodes 28 and the edge of the first electrode 28, so that the pixel opening exposes the first electrode 28. The first functional layer 21 extends to a position between the pixel opening and the supporting portion, and is located on a side of the pixel defining layer away from the substrate, further, the film thickness reduction area is located between the pixel opening and the supporting portion, and part of the film thickness flat area is located between the pixel opening and the supporting portion.

[0094] refer to Figure 8 Based on the same inventive concept, the second aspect of the present disclosure provides a method for preparing a display panel, which specifically includes the following steps:

[0095] S10: providing a substrate 10; in this step, a first electrode 28 (anode) needs to be patterned on one side of the substrate 10;

[0096] S20: preparing a support portion 32 on one side of the substrate 10;

[0097] S30: preparing the crown portion 31 on the side of the support portion 32 away from the substrate 10, wherein the orthographic projection of the support portion 32 on the substrate 10 is located within the orthographic projection range of the crown portion 31 on the substrate 10;

[0098] S40: preparing at least one light-emitting unit 20 on the same side of the substrate 10, wherein the light-emitting unit 20 includes a first functional layer 21, and the first functional layer 21 extends toward a direction close to the support portion 32;

[0099] In this step, the first functional layer 21 is formed on the substrate 10 by an evaporation process, and the fourth angle is between 50° and 70°. Further, the fourth angle includes one of 55°, 60°, and 65°.

[0100] The display panel has a plurality of cross-sections passing through the center of the light-emitting unit 20 and perpendicular to the surface where the substrate 10 is located. In any cross-section, the first straight line p1 determined by the edge of the support portion 32 on the side close to the substrate 10 and the edge of the crown portion 31 forms a third angle a3 with the surface where the substrate 10 is located. The second straight line p2 determined by the edge of the first functional layer 21 and the edge of the crown portion 31 forms a fourth angle a4 with the surface where the substrate 10 is located. The fourth angle a4 is greater than the third angle a3.

[0101] It should be noted that before step S20, the following steps are also included:

[0102] The pixel defining layer 40 is prepared on one side of the substrate, including: patterning the pixel defining layer 40 to form at least one pixel opening 410 , wherein the pixel opening 410 exposes at least a portion of the first electrode 28 (anode).

[0103] Step S20 includes: preparing a support portion 32 on a side of the pixel defining layer 40 away from the substrate;

[0104] Step S40 includes: preparing at least one light emitting unit 20 in at least one pixel opening 410 on the same side of the substrate 10;

[0105] refer to Figure 9-10 Based on the same inventive concept, the third aspect of the present disclosure provides an evaporation device, which is used for preparing the first functional layer 21 in the method for preparing a display panel. The evaporation device includes a crucible 100, an evaporation source 200 and an angle limiting component 300. The crucible 100 is provided with a cavity, and the cavity is used to accommodate the evaporation material. The evaporation source 200 is located on one side of the crucible 100, and the evaporation source 200 is connected to the crucible 100. The angle limiting component 300 is detachably arranged at the periphery of the outlet of the evaporation source 200. The end of the angle limiting component away from the evaporation source has an evaporation hole 303, and the evaporation hole 303 is used to limit the evaporation range of the evaporation material. The evaporation source 200 in this embodiment can be a nozzle.

[0106] Continue to refer Figure 9-10In a specific embodiment, the angle limiting component 300 includes a first limiting portion 301 and a second limiting portion 302, the second limiting portion 302 is located on a side of the first limiting portion 301 close to the evaporation source 200, and the second limiting portion 302 is used to limit the diffusion range of the evaporation material, that is, to block the evaporation material sprayed from the evaporation source 200 between the first limiting portion 301 and the evaporation source 200, wherein the evaporation hole 303 is located at the center of the first limiting portion 301, and the shape of the evaporation hole 303 includes a circle. Furthermore, the angle formed between the line connecting the evaporation source and the edge of the evaporation hole 303 and the evaporation surface 1 is a fourth angle, and the fourth angle a4 is between 50° -70°, further, the fourth angle includes one of 55°, 60°, and 65°. In this embodiment, the angle limiting component is replaceable, so that the evaporation holes 303 of different sizes can be selected according to needs. The second limiting portion 302 has a first through hole 304 connected to the evaporation hole 303; and the first through hole 304 has an aperture larger than the aperture of the evaporation hole 303, and the aperture of the first through hole 304 gradually increases along the direction from the evaporation source 200 to the evaporation hole 303; by setting the second limiting portion 302, the evaporation material sprayed from the evaporation source 200 can be blocked to prevent lateral leakage of the evaporation material sprayed from the evaporation source 200.

[0107] Based on the same inventive concept, the fourth aspect of the present disclosure provides a display device, which includes the above-mentioned display panel provided by the embodiment of the present disclosure. Since the principle of solving the problem by the display device is similar to the principle of solving the problem by the above-mentioned display panel, the implementation of the display device provided by the embodiment of the present disclosure can refer to the implementation of the above-mentioned display panel provided by the embodiment of the present disclosure, and the repeated parts will not be repeated.

[0108] The display device provided in the embodiment of the present invention can be applied to a mobile phone, or any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiment of the present invention does not make any special limitations on this.

[0109] It should be noted that the above describes some embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0110] The embodiments of the present disclosure are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A display panel, characterized in that: include: substrate; An isolation structure, located on one side of the substrate, the isolation structure at least comprising a supporting portion; at least one light-emitting unit, which is on the same side of the substrate as the isolation structure, and the light-emitting unit includes a first functional layer, and the first functional layer includes a film thickness reduction area; Along the direction perpendicular to the surface where the substrate is located, the distance between one end of the support portion away from the substrate and one end of the support portion close to the substrate is a first height, and along the direction parallel to the surface where the substrate is located and pointing from the light-emitting unit to the isolation structure, the width of the film thickness reduction area is a first width, and the first width is less than or equal to 1.3 times the first height.

2. The display panel according to claim 1, characterized in that: The first width is greater than or equal to 0.8 times the first height.

3. The display panel according to claim 1, characterized in that: Along the direction in which the first functional layer extends away from the light-emitting unit, the film thickness decreasing area sequentially includes a continuous first film layer and a second film layer, the minimum film thickness of the first film layer is equal to the maximum film thickness of the second film layer, the film thickness of the first film layer and the film thickness of the second film layer gradually decrease along the direction in which the first functional layer extends away from the light-emitting unit, and a first angle between a tangent line of a surface of the first film layer away from the substrate and a surface where the substrate is located is greater than a second angle between a tangent line of a surface of the second film layer away from the substrate and a plane where the substrate is located; Preferably, the first angle is between 0° and 90°; Preferably, the first angle includes one of 60°, 70° and 80°; Preferably, the thickness of the second film layer at one end away from the first film layer is equal to 0; Preferably, the first width is the distance between an edge of the first film layer away from the second film layer and an edge of the second film layer away from the first film layer.

4. The display panel according to claim 3, characterized in that: The first functional layer also includes a film thickness flatness area, which is located on a side of the first film layer away from the second film layer, and the film thickness flatness area is continuous with the first film layer. Along the direction perpendicular to the surface of the substrate, the film thickness of the first film layer is smaller than the film thickness of the film thickness flatness area.

5. The display panel according to claim 3, characterized in that: The isolation structure further includes a crown portion, the crown portion is located on a side of the support portion away from the substrate, and the orthographic projection of the support portion on the substrate is located within the orthographic projection range of the crown portion on the substrate; Along the direction perpendicular to the surface of the substrate, the film thickness in the flat area of ​​the film thickness is the first thickness, the positive projection point of the edge of the crown on the first film layer is the first projection point, the thickness of the first film layer at the first projection point is the second thickness, and the second thickness is less than or equal to 3 / 5 times the first thickness and greater than or equal to 2 / 5 times the first thickness.

6. The display panel according to claim 5, characterized in that: The light-emitting unit further includes a second functional layer, the first functional layer includes a first sub-functional layer, and at least one second functional layer is disposed on a side of the first sub-functional layer away from the substrate; Preferably, the first sub-functional layer comprises a hole transport layer; Preferably, the first functional layer further comprises a second sub-functional layer, the second sub-functional layer is located on a side of the first sub-functional layer away from the substrate, at least one layer of the second functional layer is provided between the second sub-functional layer and the first sub-functional layer, and / or at least one layer of the second functional layer is provided on a side of the second sub-functional layer away from the substrate; Preferably, the second sub-functional layer comprises a luminescent material layer; Preferably, the conductivity of the first functional layer is greater than the conductivity of the second functional layer; Preferably, the orthographic projection point of the edge of the crown on the second functional layer is the second projection point, along the direction parallel to the surface where the substrate is located, the distance between the second projection point and the edge of the second functional layer is the second length, the distance between the first projection point and the edge of the first functional layer is the first length, and the second length is greater than the first length.

7. The display panel according to claim 4, characterized in that: The display panel further comprises a pixel defining layer, the isolation structure is located on a side of the pixel defining layer away from the substrate, the pixel defining layer is provided with at least one pixel opening, and the light emitting unit is located in the pixel opening; Preferably, the isolation structure encloses at least one isolation opening, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the isolation opening on the substrate; Preferably, the first functional layer extends to a position between the pixel opening and the supporting portion, and is located on a side of the pixel defining layer away from the substrate; Preferably, the film thickness reduction area is located between the pixel opening and the support portion; Preferably, part of the film thickness flat area is located between the pixel opening and the supporting portion.

8. The display panel according to claim 5, characterized in that: The display panel has a plurality of cut planes passing through the center of the light-emitting unit and perpendicular to the surface where the substrate is located. In any of the cut planes, a first straight line defined by an edge of the support portion close to the substrate and an edge of the crown portion and the surface where the substrate is located form a third angle, and a second straight line defined by an edge of the first functional layer and an edge of the crown portion and the surface where the substrate is located form a fourth angle, and the fourth angle is greater than the third angle. Preferably, the fourth angle is between 50° and 70°, and the sum of the third angle and the fourth angle is less than 90°; Preferably, the fourth angle includes one of 55°, 60°, and 65°; Preferably, the fourth angle is an angle formed by a second straight line determined by an edge of the second film layer away from the first film layer and an edge of the crown, and the surface where the substrate is located; Preferably, the length of the first straight line is equal to the shortest distance between the edge of the support portion close to the substrate and the edge of the crown, and the length of the second straight line is equal to the shortest distance between the edge of the second film layer away from the first film layer and the edge of the crown.

9. The display panel according to claim 8, characterized in that: The support portion comprises a first support layer and a second support layer which are stacked, the second support layer is located on a side of the first support layer away from the substrate, the orthographic projection of the second support layer on the substrate is located within the orthographic projection range of the first support layer on the substrate, and the first support layer and the second support layer both comprise conductive materials; Preferably, the edge of the first supporting layer is the edge of the supporting portion close to the substrate; Preferably, the first straight line is a straight line defined by the edge of the first supporting layer and the edge of the crown; Preferably, the first supporting film layer and the second supporting film layer are made of different materials; Preferably, the first supporting film layer comprises molybdenum, and the second supporting film layer comprises aluminum.

10. A display panel, characterized in that: include: substrate; an isolation structure, located at one side of the substrate, the isolation structure comprising a crown portion and a support portion which are stacked, the crown portion being located at a side of the support portion away from the substrate, and an orthographic projection of the support portion on the substrate being within the range of an orthographic projection of the crown portion on the substrate; at least one light-emitting unit, located on the same side of the substrate as the isolation structure, the light-emitting unit comprising a first functional layer; The display panel has a plurality of cross-sections passing through the center of the light-emitting unit and perpendicular to the surface where the substrate is located. In any of the cross-sections, a first straight line defined by an edge of the support portion on a side close to the substrate and an edge of the crown portion forms a third angle with the surface where the substrate is located, and a second straight line defined by an edge of the first functional layer and an edge of the crown portion forms a fourth angle with the surface where the substrate is located, and the fourth angle is greater than the third angle.

11. The display panel according to claim 10, characterized in that: The four angles are between 50° and 70°, and the sum of the fourth angle and the third angle is less than 90°; Preferably, the fourth angle includes one of 55°, 60°, and 65°; Preferably, the length of the first straight line is equal to the shortest distance between the edge of the support portion close to the substrate and the edge of the crown portion, and the length of the second straight line is equal to the shortest distance between the edge of the first functional layer and the edge of the crown portion.

12. The display panel according to claim 10, characterized in that: The display panel further includes a pixel defining layer, the isolation structure is located on a side of the pixel defining layer away from the substrate, the pixel defining layer is provided with at least one pixel opening, and the light emitting unit is located in the pixel opening.

13. The display panel according to claim 12, characterized in that: The isolation structure encloses and forms at least one isolation opening, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the isolation opening on the substrate; Preferably, the first functional layer extends to a position between the pixel opening and the supporting portion, and is located on a side of the pixel defining layer away from the substrate.

14. The display panel according to claim 10, characterized in that: The support portion comprises a first support layer and a second support layer which are stacked, the second support layer is located on a side of the first support layer away from the substrate, the orthographic projection of the second support layer on the substrate is located within the orthographic projection range of the first support layer on the substrate, and the first support film layer and the second support film layer both comprise a conductive material; Preferably, the edge of the supporting portion close to the substrate is the edge of the first supporting layer; Preferably, the first straight line is defined by the edge of the first supporting layer and the edge of the crown; Preferably, the first supporting film layer and the second supporting film layer are made of different materials; Preferably, the first supporting film layer comprises molybdenum, and the second supporting film layer comprises aluminum.

15. A method for preparing a display panel, characterized in that: The steps include: providing a substrate; preparing a support portion on one side of the substrate; A crown portion is prepared on a side of the support portion away from the substrate, wherein the orthographic projection of the support portion on the substrate is within the range of the orthographic projection of the crown portion on the substrate; At least one light-emitting unit is prepared on the same side of the substrate, wherein the light-emitting unit includes a first functional layer, and the first functional layer extends toward a direction close to the support portion; The display panel has a plurality of cross-sections passing through the center of the light-emitting unit and perpendicular to the surface where the substrate is located. In any of the cross-sections, a first straight line defined by an edge of the support portion close to the substrate and an edge of the crown portion forms a third angle with the surface where the substrate is located, and a second straight line defined by an edge of the first functional layer and an edge of the crown portion forms a fourth angle with the surface where the substrate is located, and the fourth angle is greater than the third angle.

16. The method for preparing a display panel according to claim 15, characterized in that: Forming a first functional layer on the substrate by an evaporation process, wherein the fourth angle is between 50° and 70°; Preferably, the fourth angle includes one of 55°, 60°, and 65°.

17. The method for preparing a display panel according to claim 15, characterized in that: Preferably, before preparing the support portion on one side of the substrate, the method further comprises: Prepare a pixel defining layer on one side of the substrate; Patterning the pixel defining layer to form at least one pixel opening; Preferably, the step of preparing a support portion on one side of the substrate comprises: Prepare the support portion on a side of the pixel defining layer away from the substrate; Preferably, preparing at least one light-emitting unit on the same side of the substrate comprises: The at least one light emitting unit is prepared in the at least one pixel opening on the same side of the substrate.

18. A vapor deposition device, characterized in that: In the method for preparing a display panel according to any one of claims 15 to 17, the evaporation device is used to prepare the first functional layer, wherein the evaporation device comprises: A crucible having a cavity for containing an evaporation material; An evaporation source is located at one side of the crucible, and the evaporation source is connected to the crucible; The angle limiting component is detachably arranged at the periphery of the outlet of the evaporation source. The end of the angle limiting component away from the evaporation source is provided with an evaporation hole, and the evaporation hole is used to limit the evaporation range of the evaporation material.

19. The evaporation device according to claim 18, characterized in that: The angle limiting component comprises: a first limiting portion, wherein the evaporation hole is located at the center of the first limiting portion; A second limiting portion is located on a side of the first limiting portion close to the evaporation source, the second limiting portion has a first through hole connected to the evaporation hole, the aperture of the first through hole is larger than the aperture of the evaporation hole, and the second limiting portion is used to limit the diffusion range of the evaporation material; Preferably, the shape of the evaporation hole includes a circle; Preferably, the orthographic projection of the first through hole on the first limiting portion covers the evaporation hole; Preferably, along the direction from the evaporation source to the evaporation hole, the aperture of the first through hole gradually increases; Preferably, an angle formed between a line connecting the evaporation source and the edge of the evaporation hole and the evaporation surface is a fourth angle, and the fourth angle is between 50° and 70°; Preferably, the fourth angle includes one of 55°, 60°, and 65°.

20. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 14.

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