Display panel and display device

Abstract

The invention relates to the technical field of display, and particularly provides a display panel and a display device.The display panel comprises a substrate and a pixel definition layer, the pixel definition layer is located on one side of the substrate, multiple pixel openings are formed in the pixel definition layer, the pixel definition layer comprises a first side wall facing one side of the pixel openings, and the first side wall is located on one side of the substrate. The pixel definition layer further comprises a first bottom wall facing one side of the substrate; wherein in the direction perpendicular to the plane where the substrate is located, the end, close to the substrate, of the first side wall intersects with the first bottom wall, an inclination angle is formed, and the angle of the inclination angle is not larger than 60 degrees. The display panel can achieve the effect of improving the use performance by adjusting the shapes of the pixel openings of the pixel definition layer.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and more specifically, to a display panel and a display device. Background Art

[0002] Organic Light Emitting Diode (OLED) and flat-panel display devices based on technologies such as OLED have the advantages of high image quality, power saving, thin body and wide application range, and are widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc., becoming the mainstream in display devices.

[0003] However, the performance of current OLED display products needs to be improved. Summary of the invention

[0004] The present application provides a display panel and a display device to improve the performance of the display panel at least to a certain extent.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: in a first aspect, a display panel is provided, comprising a substrate and a pixel definition layer, wherein the pixel definition layer is located on one side of the substrate, the pixel definition layer is provided with a plurality of pixel openings, the pixel definition layer comprises a first side wall facing the pixel opening, and the pixel definition layer further comprises a first bottom wall facing the substrate;

[0006] Wherein, in a direction perpendicular to the plane where the substrate is located, an end of the first side wall close to the substrate intersects with the first bottom wall and forms an inclination angle, and the inclination angle is not greater than 60°.

[0007] In the display panel provided in the embodiment of the present application, by controlling the first side wall of the pixel definition layer close to or pointing to the pixel opening to be an inclined side wall and forming an inclination angle of no more than 60° between the first side wall and the first bottom wall, the climbing difficulty of the subsequent film layer at the first side wall can be effectively reduced, and the corresponding film layer can achieve good continuity at this location, avoiding the film layer impedance from being affected, and reducing the display abnormality caused by the poor continuity of the film layer at the first side wall. This structural improvement helps to improve the display effect and reliability of the display panel, and can improve the performance of the display panel to a certain extent.

[0008] Optionally, the material of the pixel definition layer includes an inorganic material.

[0009] Optionally, the inclination angle is not less than 30°.

[0010] Optionally, the inclination angle ranges from 40° to 50°.

[0011] Optionally, an isolation structure is provided on the side of the pixel definition layer facing away from the substrate, the isolation structure encloses a plurality of isolation openings, the isolation openings are arranged correspondingly to and connected to the pixel openings, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the isolation opening on the substrate.

[0012] Optionally, the display panel also includes a light-emitting device layer, which is located on the substrate and includes a plurality of light-emitting devices located in the corresponding isolation openings, the light-emitting device includes a light-emitting functional layer and a first electrode, the light-emitting functional layer covers the pixel opening and the light-emitting functional layer covers at least a portion of the first side wall, and the first electrode covers a side of the light-emitting functional layer facing away from the substrate and contacts a side wall of the isolation structure facing the isolation opening.

[0013] Optionally, the first electrode overlaps a portion of a side wall of the isolation structure close to the substrate.

[0014] Optionally, the light-emitting functional layer includes a first light-emitting sub-portion and a second light-emitting sub-portion, the first light-emitting sub-portion covers the pixel opening, the second light-emitting sub-portion covers at least a portion of the first side wall, and the thickness of the second light-emitting sub-portion is less than the thickness of the first light-emitting sub-portion;

[0015] Preferably, the multiple pixel openings include at least a first opening and a second opening arranged at intervals, the inclination angle of the first opening is greater than the inclination angle of the second opening, and the thickness ratio of the second light-emitting sub-section arranged at the first opening to the corresponding first light-emitting sub-section is smaller than the thickness ratio of the second light-emitting sub-section arranged at the second opening to the corresponding first light-emitting sub-section.

[0016] Optionally, the second light-emitting subunit disposed at the first opening has the same light-emitting color as the second light-emitting subunit disposed at the second opening, and the thickness of the second light-emitting subunit disposed at the first opening is smaller than the thickness of the second light-emitting subunit disposed at the second opening.

[0017] Optionally, a thickness ratio of the second light-emitting sub-section to the first light-emitting sub-section is negatively correlated with the inclination angle.

[0018] Optionally, an orthographic projection of the second light-emitting sub-portion on the substrate coincides with an orthographic projection of the first side wall on the substrate.

[0019] Optionally, within the same pixel opening, the thickness of the second light-emitting sub-section is not less than 50% of the thickness of the first light-emitting sub-section.

[0020] Optionally, within the same pixel opening, a thickness ratio of the second light-emitting sub-portion to the first light-emitting sub-portion is 50% to 95%.

[0021] Optionally, when the inclination angle is 60°, the thickness of the second light-emitting sub-portion is 50% of the thickness of the first light-emitting sub-portion.

[0022] Optionally, when the inclination angle is 30°, the thickness of the second light-emitting sub-portion is 95% of the thickness of the first light-emitting sub-portion.

[0023] Optionally, the light-emitting functional layer further includes a third light-emitting sub-unit, and the third light-emitting sub-unit is located on a side of the pixel definition layer facing away from the substrate;

[0024] In the same pixel opening, the second light-emitting sub-section is located between the first light-emitting sub-section and the third light-emitting sub-section and connects the first light-emitting sub-section and the third light-emitting sub-section.

[0025] Optionally, an orthographic projection of the third light-emitting sub-unit on the substrate is spaced apart from an orthographic projection of a side of the isolation structure close to the substrate on the substrate.

[0026] Optionally, within the same pixel opening, the thickness of the third light-emitting sub-unit is not greater than the thickness of the first light-emitting sub-unit.

[0027] Optionally, the light emitting device further comprises a second electrode, the second electrode is located between the pixel definition layer and the substrate, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the second electrode on the substrate;

[0028] The light emitting functional layer contacts the second electrode through the pixel opening.

[0029] Optionally, the isolation structure comprises a support portion and a crown portion, and the crown portion is located on a side of the support portion facing away from the substrate;

[0030] The orthographic projection of the support portion on the substrate is located within the orthographic projection of the crown portion on the substrate.

[0031] Optionally, the supporting portion comprises at least two superimposed sub-supporting portions, and an orthographic projection of the sub-supporting portion farther from the substrate on the substrate is located within an orthographic projection of the sub-supporting portion closer to the substrate on the substrate.

[0032] Optionally, an orthographic projection of the sub-support portion closest to the substrate on the substrate is located within an orthographic projection of the crown portion on the substrate.

[0033] Optionally, in a direction perpendicular to the plane where the substrate is located, a cross-sectional profile of a portion of the sub-support portion located between two adjacent isolation openings is one of a rectangle, a trapezoid and an inverted trapezoid.

[0034] Optionally, in a direction perpendicular to the plane where the substrate is located, a cross-sectional profile of a portion of the crown portion located between two adjacent isolation openings is any one of a trapezoid, a rectangle and an inverted trapezoid.

[0035] Optionally, the material of the crown includes metallic titanium.

[0036] Optionally, the material of the sub-support portion includes any one of metal aluminum and metal molybdenum.

[0037] Optionally, the display panel also includes an encapsulation layer, the encapsulation layer includes a plurality of encapsulation units arranged at intervals, the encapsulation unit includes a first encapsulation portion and a second encapsulation portion that are connected, the first encapsulation portion is located on a side of the first electrode that is away from the substrate and covers a side wall of the isolation structure facing the isolation opening, and the second encapsulation portion is located on a side of the isolation structure that is away from the substrate.

[0038] Optionally, a gap exists between the second packaging portion and a surface of the isolation structure facing away from the substrate.

[0039] In a second aspect, the present application further provides a display panel, comprising a substrate and a pixel definition layer, wherein the pixel definition layer is located on one side of the substrate, the pixel definition layer is provided with a plurality of pixel openings, the pixel definition layer comprises a first side wall facing the pixel openings, and the pixel definition layer further comprises a first bottom wall facing the substrate;

[0040] Wherein, in a direction perpendicular to the plane where the substrate is located, an end of the first side wall close to the substrate intersects with the first bottom wall and forms an inclination angle; the multiple pixel openings include at least a first opening and a second opening arranged at intervals, and the inclination angle of the first opening is greater than the inclination angle of the second opening.

[0041] Optionally, the display panel further includes a light-emitting functional layer arranged corresponding to the pixel opening, and the light-emitting functional layer covers the pixel opening and covers at least a portion of the first side wall.

[0042] Optionally, the light-emitting functional layer includes a first light-emitting sub-portion and a second light-emitting sub-portion, the first light-emitting sub-portion covers the pixel opening, the second light-emitting sub-portion covers at least a portion of the first side wall, and the thickness of the second light-emitting sub-portion is less than the thickness of the first light-emitting sub-portion.

[0043] Optionally, a thickness ratio of the second light-emitting sub-portion disposed in the first opening to the corresponding first light-emitting sub-portion is smaller than a thickness ratio of the second light-emitting sub-portion disposed at the second opening to the corresponding first light-emitting sub-portion.

[0044] Optionally, the second light-emitting subunit disposed at the first opening has the same light-emitting color as the second light-emitting subunit disposed at the second opening, and the thickness of the second light-emitting subunit disposed at the first opening is smaller than the thickness of the second light-emitting subunit disposed at the second opening.

[0045] Optionally, a thickness ratio of the second light-emitting sub-section to the first light-emitting sub-section is negatively correlated with the inclination angle.

[0046] Optionally, an orthographic projection of the second light-emitting sub-portion on the substrate coincides with an orthographic projection of the first side wall on the substrate.

[0047] Optionally, within the same pixel opening, the thickness of the second light-emitting sub-section is not less than 50% of the thickness of the first light-emitting sub-section.

[0048] Optionally, within the same pixel opening, a thickness ratio of the second light-emitting sub-portion to the first light-emitting sub-portion is 50% to 95%.

[0049] Optionally, when the inclination angle is 60°, the thickness of the second light-emitting sub-portion is 50% of the thickness of the first light-emitting sub-portion.

[0050] Optionally, when the inclination angle is 30°, the thickness of the second light-emitting sub-portion is 95% of the thickness of the first light-emitting sub-portion.

[0051] Optionally, the inclination angle in any pixel opening is not greater than 60°.

[0052] Optionally, the inclination angle is not less than 30°.

[0053] Optionally, the inclination angle ranges from 40° to 50°.

[0054] Optionally, the material of the pixel definition layer includes an inorganic material.

[0055] Optionally, an isolation structure is provided on the side of the pixel definition layer facing away from the substrate, the isolation structure encloses a plurality of isolation openings, the isolation openings are arranged correspondingly to and connected to the pixel openings, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the isolation opening on the substrate.

[0056] Optionally, the display panel further includes a first electrode located in the corresponding isolation opening, the first electrode covers a side of the light-emitting functional layer facing away from the substrate and contacts a side wall of the isolation structure facing the isolation opening.

[0057] Optionally, the first electrode overlaps a portion of a side wall of the isolation structure close to the substrate.

[0058] Optionally, the display panel also includes a second electrode, which is located between the pixel definition layer and the substrate, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the second electrode on the substrate, and the light-emitting functional layer is in contact with the second electrode through the pixel opening.

[0059] Optionally, the display panel also includes an encapsulation layer, the encapsulation layer includes a plurality of encapsulation units arranged at intervals, the encapsulation unit includes a first encapsulation portion and a second encapsulation portion that are connected, the first encapsulation portion is located on a side of the first electrode that is away from the substrate and covers a side wall of the isolation structure facing the isolation opening, and the second encapsulation portion is located on a side of the isolation structure that is away from the substrate.

[0060] Optionally, a gap exists between the second packaging portion and a surface of the isolation structure facing away from the substrate.

[0061] In a third aspect, the present application further provides a display device, comprising any of the display panels described above.

[0062] The display device provided in the embodiment of the present application includes the above-mentioned display panel, so the display device at least includes the beneficial effects of any one or several of the above-mentioned display panels. The specific effects are described above and will not be repeated here.

[0063] The display panel and display device provided by the present application have the following beneficial effects: compared with the related art, the display panel provided by the present application can adjust the morphology of the first side wall of the pixel definition layer pointing to one end of the pixel opening so that it is inclined relative to the first bottom wall and forms an inclination angle of no more than 60° with the first bottom wall, which can reduce the climbing difficulty of the first electrode prepared at the first side wall, improve the continuity of the first electrode at the first side wall, and reduce the possibility of the first electrode breaking or falling off at this place as much as possible, which helps to reduce the impedance of the first electrode at this place, ensure that the related light-emitting device has a relatively uniform light-emitting brightness, and reduce the probability of display defects such as pixel dark spots. This structure can improve the reliability of the display panel and improve the display effect and performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0065] Figure 1 A schematic diagram of the planar structure of a display panel provided in an embodiment of the present application;

[0066] Figure 2 for Figure 1 The structure of area A in the display panel is shown as an enlarged view;

[0067] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of a display panel is shown;

[0068] Figure 4 for Figure 3 A magnified view of the structure in the middle B area;

[0069] Figure 5 for Figure 2 A schematic diagram of a second cross-sectional structure of the display panel shown;

[0070] Figure 6 A schematic diagram of an intermediate structure of a display panel during the preparation process provided by an embodiment of the present application;

[0071] Figure 7 A schematic diagram of the planar structure of a display device provided in an embodiment of the present application.

[0072] Among them, the reference numerals in the figure are:

[0073] 1. Substrate; 2. Pixel definition layer; 201. Pixel opening; 201a. First opening; 201b. Second opening; 21. First side wall; 22. First bottom wall; 23. Inclination angle; 3. Isolation structure; 301. Isolation opening; 31. Supporting part; 311. Sub-supporting part; 32. Crown; 4. Light-emitting device; 41. Light-emitting functional layer; 411. First light-emitting sub-part; 412. Second light-emitting sub-part; 413. Third light-emitting sub-part; 42. First electrode; 43. Second electrode; 5. Encapsulation unit; 51. First encapsulation part; 52. Second encapsulation part;

[0074] 10. Display panel; 100. Display device. DETAILED DESCRIPTION

[0075] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0076] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0077] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0079] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] The term "layer" used in the text may refer to a material portion including an area with a certain thickness. A layer may extend over the entire underlying structure or overlying structure, or may have a range smaller than the range of the underlying or overlying structure. In addition, a layer may be an area of ​​a homogeneous or inhomogeneous continuous structure, the thickness of which is less than the thickness of the continuous structure. For example, a layer may be located between the top surface and the bottom surface of the continuous structure or between any paired lateral planes at the top surface and the bottom surface. A layer may extend laterally, vertically and / or along a tapered surface. A substrate may be a layer, may include one or more layers therein, and / or may have one or more layers located thereon, above it and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductors and a contact layer (forming contacts, interconnects and / or vias therein) and one or more dielectric layers.

[0083] In the process of implementing the present application, the inventors discovered the following problems in the related technology: some pixel units have display anomalies, which to some extent affect the display effect of the display panel 10 and ultimately affect its performance, reducing the reliability of the display panel 10.

[0084] Based on this, an embodiment of the present application provides a display panel 10 to alleviate or improve the above technical problems at least to a certain extent.

[0085] See also Figure 1 and Figure 2 The embodiment of the present application provides a display panel 10, which includes a substrate 1 and a pixel definition layer 2, wherein the pixel definition layer 2 is located on one side of the substrate 1. In a direction perpendicular to the surface of the substrate 1, the initial thickness of the pixel definition layer 2 at each position is substantially the same.

[0086] The display panel 10 further includes an isolation structure 3 . The isolation structure 3 is located on a side of the pixel definition layer 2 facing away from the substrate 1 . The pixel definition layer 2 is located between the isolation structure 3 and the substrate 1 .

[0087] See also Figure 2 and Figure 3 The isolation structure 3 encloses and forms a plurality of isolation openings 301. The pixel definition layer 2 is provided with a plurality of pixel openings 201, and the isolation openings 301 are arranged correspondingly and connected to the pixel openings 201.

[0088] The pixel definition layer 2 includes a first side wall 21 on the side facing the pixel opening 201, and the pixel definition layer 2 also includes a first bottom wall 22 on the side facing the substrate 1. In a direction perpendicular to the plane where the substrate 1 is located, an end of the first side wall 21 close to the substrate 1 intersects with the first bottom wall 22 and forms an inclination angle 23, and the angle of the inclination angle 23 is not greater than 60°.

[0089] The contents of the isolation structure 3 mentioned below are further described in patents CN118251982A, 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, PCT / CN2024 / 099072, CN117979755A, CN117998900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A for reference.

[0090] See also Figure 2 There are multiple pixel openings 201, and the multiple pixel openings 201 at least include a first opening 201a and a second opening 201b, etc., which are sequentially arranged in an extending direction of the pixel definition layer 2. Accordingly, the isolation openings 301 are arranged one-to-one with the first openings 201a and the second openings 201b, etc., and are connected.

[0091] The pixel definition layer 2 can form an inclination angle 23 at any pixel opening 201 (eg, the first opening 201 a , or the second opening 201 b , or other openings). The inclination angles at different pixel openings 201 can be the same or different.

[0092] See also Figure 3 and Figure 4 , there is a gap between the orthographic projection of the end of the first side wall 21 formed at a certain pixel opening 201 facing away from the substrate 1 and the orthographic projection of the end close to the substrate 1 on the substrate 1, and the orthographic projection of the end facing away from the substrate 1 on the substrate 1 is located outside the orthographic projection of the end close to the substrate 1 on the substrate 1 (that is, located outside the pixel opening 201). The first side wall 21 and the first bottom wall 22 intersect to form an inclination angle 23 pointing to the middle of the pixel opening 201, and the angle of the inclination angle 23 is not greater than 60°.

[0093] In the display panel 10 provided in the embodiment of the present application, the first side wall 21 of the pixel definition layer 2 close to or pointing to the pixel opening 201 is controlled to be an inclined side wall and an inclination angle 23 of no more than 60° is formed between the first side wall 21 and the first bottom wall 22. At this time, the inclined first side wall 21 makes the film thickness of the pixel definition layer 2 slowly thicken toward the side away from the pixel opening 201, so that the thickness of the film layer area where the first side wall 21 for supporting the subsequent process is located changes more slowly, which is conducive to the smooth attachment and overlap of the subsequent film layer at the first side wall 21, so as to reduce the difficulty of climbing the subsequent film layer at the first side wall 21, and enable the corresponding film layer to achieve better continuity at this place, avoid the film layer impedance being affected, and reduce the display abnormality caused by the poor continuity of the film layer at the first side wall 21. This structural improvement helps to improve the display effect and reliability of the display panel 10, and can improve the performance of the display panel 10 to a certain extent.

[0094] For example, when the surface of the first side wall 21 needs to overlap the light emitting device 4, the relatively flat first side wall 21 can enable the light emitting device 4 to overlap smoothly along the first side wall 21, which helps to improve the continuity of the film layer.

[0095] In some embodiments, the surface of the first side wall 21 is a smooth surface, or may be a low-roughness surface.

[0096] In order to facilitate processing of the pixel definition layer 2 and obtain the above-mentioned inclination angle 23 , in some embodiments, the material of the pixel definition layer 2 includes an inorganic material.

[0097] In this embodiment, the pixel definition layer 2 can be processed by dry etching to obtain the pixel opening 201 and the above-mentioned inclination angle 23 .

[0098] Dry etching has directionality, so it can ensure that the prepared pixel opening 201 is etched more accurately, and the edge of the first side wall 21 surrounding the pixel opening 201 is clear and regular, and the morphology meets the design requirements.

[0099] Specifically, the inclination angle 23 is not less than 30°.

[0100] See also Figure 3 The angle range of the above-mentioned inclination angle 23 is 30° to 60°, and its specific numerical range can be adjusted according to actual needs. For example, the angle can be any value among 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0101] In other embodiments, the angle range of the inclination angle 23 may be set to 40° to 50°. In this case, the inclination angle 23 may be any value of 30°, 35°, 40°, 45°, 50°, etc.

[0102] When the inclination angle 23 is too large, the first side wall 21 will be steeper, which will affect the thickness and continuity of the film layer subsequently attached there; when the inclination angle 23 is too small, the length of the first side wall 21 extending toward the pixel opening 201 will be too long, affecting the opening size of the pixel opening 201, and also affecting the display effect of the display panel 10.

[0103] It should also be noted that the contact portion between the first side wall 21 and the first bottom wall 22 cannot be located on the side of the first side wall 21 away from the pixel opening 201. In this case, the circumferential side edge of the pixel definition layer 2 close to the pixel opening 201 will form a reverse taper structure, which will further increase the difficulty of overlapping the subsequent film layer with the first side wall 21, and may even cause the cathode to break directly at this location.

[0104] See also Figure 3 and Figure 4 The display panel 10 further includes a light emitting device layer, which is located on the substrate 1 and includes a plurality of light emitting devices 4 located in corresponding isolation openings 301. The isolation openings 301 are used to accommodate the light emitting devices 4. The light emitting device 4 includes at least a light emitting functional layer 41 and a first electrode 42 which are stacked.

[0105] Specifically, the light-emitting functional layer 41 covers the pixel opening 201 and at least a portion of the first sidewall 21 . The first electrode 42 covers the side of the light-emitting functional layer 41 facing away from the substrate 1 and contacts the sidewall of the isolation structure 3 facing the isolation opening 301 .

[0106] The orthographic projection of the pixel opening 201 on the substrate 1 is located within the orthographic projection of the light-emitting functional layer 41 on the substrate 1 .

[0107] Specifically, the light-emitting functional layer 41 can be made of organic small molecule light-emitting materials, complex light-emitting materials, and high molecular polymers. Different light-emitting functional layers 41 can be used to emit light of different colors. Generally speaking, there are three types of light-emitting functional layers 41, which are used to emit red, green, and blue light, respectively. Exemplarily, the light-emitting functional layer 41 is an organic functional layer located between the first electrode 42 and the second electrode 43. The light-emitting functional layer 41 can specifically include one or more organic functional layers of a light-emitting layer, an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer.

[0108] In different isolation openings 301 , one or more of the three different light-emitting functional layers 41 can be arranged respectively according to design requirements.

[0109] See also Figure 3 The light-emitting functional layer 41 includes a first light-emitting sub-portion 411 and a second light-emitting sub-portion 412 . The first light-emitting sub-portion 411 covers the pixel opening 201 , and the second light-emitting sub-portion 412 covers at least a portion of the first side wall 21 .

[0110] The light-emitting functional layer 41 can be prepared by evaporation. The larger the angle of the inclination angle 23, the smaller the thickness of the second light-emitting sub-portion 412 formed by evaporation on the first side wall 21. Accordingly, the difficulty of the first electrode 42 located on the side of the light-emitting functional layer 41 facing away from the substrate 1 to climb along the second light-emitting sub-portion 412 is higher, and the possibility of the first electrode 42 having a film discontinuity defect on the side of the second light-emitting sub-portion 412 facing away from the substrate 1 is higher. When a discontinuity defect occurs in the first electrode 42, the impedance of the first electrode 42 becomes larger, affecting the display effect of the light-emitting device 4, resulting in low brightness of the light-emitting device 4.

[0111] See also Figure 4 , the thickness d2 of the second light-emitting sub-portion 412 is smaller than the thickness d1 of the first light-emitting sub-portion 411 .

[0112] When there are different inclination angles 23 formed at different pixel openings 201, take the first opening 201a and the second opening 201b as an example. The first opening 201a and the second opening 201b are arranged at intervals on the pixel definition layer 2, and the inclination angle 23 formed at the first opening 201a is greater than the inclination angle 23 formed at the second opening 201b. Accordingly, the thickness ratio of the second light-emitting sub-section 412 provided at the first opening 201a to the corresponding first light-emitting sub-section 411 is less than the thickness ratio of the second light-emitting sub-section 412 provided at the second opening 201b to the corresponding first light-emitting sub-section 411.

[0113] The thickness ratio of the second light-emitting sub-portion 412 to the first light-emitting sub-portion 411 is negatively correlated with the angle of inclination 23 .

[0114] In another embodiment, the second light-emitting sub-section 412 disposed at the first opening 201a has the same light-emitting color as the second light-emitting sub-section 412 disposed at the second opening 201b, and the thickness of the second light-emitting sub-section 412 disposed at the first opening 201a is smaller than the thickness of the second light-emitting sub-section 412 disposed at the second opening 201b.

[0115] The greater the thickness ratio of the second light-emitting sub-section 412 to the corresponding first light-emitting sub-section 411, or the greater the thickness of the second light-emitting sub-section 412, the less difficult it is for the first electrode 42 located on the side of the light-emitting functional layer 41 facing away from the substrate 1 to climb along the second light-emitting sub-section 412, and the lower the possibility of discontinuity defects of the first electrode 42 on the second light-emitting sub-section 412. Therefore, without changing other processing conditions, adjusting the inclination angle 23 helps to improve the film continuity of the first electrode 42, so as to reduce the impedance of the first electrode 42 and optimize the display effect of the light-emitting device 4.

[0116] In addition, the thickness of the second light-emitting sub-portion 412 will also affect the heating of the first electrode 42 during operation to a certain extent. If the second light-emitting sub-portion 412 is too thin, the first electrode 42 may generate local overheating when powered on, thereby accelerating the aging and degradation of the material of the first electrode 42 and reducing the stability and service life of the first electrode 42.

[0117] The second light-emitting sub-portion 412 of the light-emitting functional layer 41 is attached to the surface of the first side wall 21. Figure 4 , affected by the inclined first side wall 21, the thickness d2 of the second light-emitting sub-section 412 is less than the thickness d1 of the first light-emitting sub-section 411. Exemplarily, the thickness of the second light-emitting sub-section 412 may be the thickness of the film layer measured in a direction perpendicular to the surface where the first side wall 21 of the pixel definition layer 2 is located. It should be noted that when the thickness of the film layer is uneven, the thickness of the corresponding light-emitting section may refer to the average thickness or the thickness of the portion corresponding to the middle position of the area where the film layer is located. In some embodiments, the orthographic projection of the above-mentioned second light-emitting sub-section 412 on the substrate 1 coincides with the orthographic projection of the first side wall 21 on the substrate 1, and at this time, the second light-emitting sub-section 412 covers the first side wall 21 of the pixel definition layer 2.

[0118] When the inclination angle 23 of the pixel definition layer 2 is between 30° and 60°, the thickness d2 of the second light-emitting sub-portion 412 located in the same pixel opening 201 is not less than 50% of the thickness d1 of the first light-emitting sub-portion 411 .

[0119] Since the thickness ratio of the second light-emitting sub-portion 412 to the first light-emitting sub-portion 411 is negatively correlated with the angle of inclination 23 , the larger the angle of inclination 23 is, the smaller the thickness of the second light-emitting sub-portion 412 is.

[0120] In this embodiment, when the inclination angle 23 is 60°, the thickness of the second light-emitting sub-portion 412 is 50% of the thickness of the first light-emitting sub-portion 411 ; when the inclination angle 23 is 30°, the thickness of the second light-emitting sub-portion 412 is 95% of the thickness of the first light-emitting sub-portion 411 .

[0121] Specifically, in the same pixel opening 201 , the thickness ratio of the second light-emitting sub-portion 412 to the first light-emitting sub-portion 411 is 50% to 95%.

[0122] By adjusting the angle of the inclination angle 23, the thickness of the second light-emitting sub-portion 412 attached to the first side wall 21 can be adjusted without changing other parameters, so as to help reduce the difficulty of the first electrode 42 climbing above the first side wall 21, thereby achieving the effect of improving the impedance of the first electrode 42.

[0123] In other similar embodiments, the light-emitting functional layer 41 includes a first light-emitting subsection 411, a second light-emitting subsection 412 and a third light-emitting subsection 413. The structures of the first light-emitting subsection 411 and the second light-emitting subsection 412 are as described above, and the third light-emitting subsection 413 is located on the side of the pixel definition layer 2 facing away from the substrate 1; in the same pixel opening 201, the second light-emitting subsection 412 is located between the first light-emitting subsection 411 and the third light-emitting subsection 413 and connects the first light-emitting subsection 411 and the third light-emitting subsection 413.

[0124] Specifically, the thickness d3 of the third light-emitting sub-portion 413 is not greater than the thickness d1 of the first light-emitting sub-portion 411 .

[0125] Affected by the evaporation angle, the thickness d3 of the third light-emitting sub-portion 413 may be substantially consistent with the thickness d1 of the first light-emitting sub-portion 411 , or may be slightly smaller than the thickness d1 of the first light-emitting sub-portion 411 .

[0126] The film thickness of the first light-emitting sub-unit 411 at different positions is substantially consistent.

[0127] See also Figure 3 The orthographic projection of the third light-emitting sub-unit 413 on the substrate 1 is spaced apart from the orthographic projection of the isolation structure 3 on the substrate 1 close to the substrate 1 , that is, the light-emitting functional layer 41 and the isolation structure 3 are in a non-contact state.

[0128] The first electrode 42 located on the side of the light-emitting functional layer 41 facing away from the substrate 1 covers the light-emitting functional layer 41 and overlaps a portion of the side wall of the isolation structure 3 close to the substrate 1 .

[0129] See also Figure 3The light-emitting device 4 also includes a second electrode 43, which is located between the pixel definition layer 2 and the substrate 1, and the orthographic projection of the pixel opening 201 on the substrate 1 is located within the orthographic projection of the second electrode 43 on the substrate 1; the light-emitting functional layer 41 contacts the second electrode 43 through the pixel opening 201.

[0130] The light emitting functional layer 41 is located between the first electrode 42 and the second electrode 43 .

[0131] See also Figure 3 and Figure 5 , the second electrode 43 is located between the pixel definition layer 2 and the substrate 1 .

[0132] One of the first electrode 42 and the second electrode 43 constituting the light emitting device 4 is an anode, and the other is a cathode.

[0133] In this embodiment, the first electrode 42 is a cathode, and the second electrode 43 is an anode; of course, in other similar embodiments, the first electrode 42 can be adjusted to be an anode, and the second electrode 43 can be adjusted to be a cathode as needed.

[0134] The isolation structure 3 can use the isolation openings 301 to isolate the light-emitting functional layer 41 and the first electrode 42 respectively located in different isolation openings 301 , so that the light-emitting functional layer 41 and the first electrode 42 respectively located in different isolation openings 301 can remain independent and not conductive to each other.

[0135] The shape of the isolation structure 3 enclosing the isolation opening 301 is described in detail below.

[0136] The isolation structure 3 includes a support portion 31 and a crown portion 32, wherein the crown portion 32 is located on a side of the support portion 31 facing away from the substrate 1;

[0137] The orthographic projection of the support portion 31 on the substrate 1 is located within the orthographic projection of the crown portion 32 on the substrate 1 .

[0138] In the direction perpendicular to the plane where the substrate 1 is located, the cross-sectional shape of the portion of the isolation structure 3 located between two adjacent isolation openings 301 is similar to a rectangular or trapezoidal structure, or the cross-sectional shape of the isolation structure 3 can also present a "wide at the top and narrow at the bottom" shape. The orthographic projection of the end of the isolation structure 3 close to the substrate 1 on the substrate 1 is within the range of the orthographic projection of the end of the isolation structure 3 facing away from the substrate 1 on the substrate 1.

[0139] Specifically, the support portion 31 may be a single-layer structure or a multi-layer structure.

[0140] When the support portion 31 is a multi-layer structure, in some embodiments, the support portion 31 includes at least two stacked sub-support portions 311, and the orthographic projection of the sub-support portion 311 farther from the substrate 1 on the substrate 1 is located within the orthographic projection of the sub-support portion 311 closer to the substrate 1 on the substrate 1.

[0141] By observation Figure 3 It can be confirmed that the orthographic projection of the sub-support portion 311 closest to the substrate 1 on the substrate 1 is located within the orthographic projection of the crown portion 32 on the substrate 1 .

[0142] In the direction perpendicular to the plane where the substrate 1 is located, the cross-sectional profile of the portion of the sub-support portion 311 located between two adjacent isolation openings 301 is one of a rectangle, a trapezoid, and an inverted trapezoid. Similarly, in the direction perpendicular to the plane where the substrate 1 is located, the cross-sectional profile of the portion of the crown portion 32 located between two adjacent isolation openings 301 is any one of a trapezoid, a rectangle, and an inverted trapezoid.

[0143] See also Figure 3 The cross-sectional profiles of the crown portion 32 and the sub-support portion 311 close to the substrate 1 are rectangular, and the cross-sectional profile of the sub-support portion 311 far from the substrate 1 can be rectangular or a regular trapezoid.

[0144] In some embodiments, the side wall of the sub-support portion 311 far from the substrate 1 facing the isolation opening 301 is offset toward the side away from the isolation opening 301 relative to the side wall of the sub-support portion 311 far from the substrate 1 facing the isolation opening 301, thereby making the cross-sectional side wall of the isolation structure 3 present a shape similar to an eaves.

[0145] Of course, in other identical or similar embodiments, the size and projection relationship between the support portion 31 and the crown portion 32 may also be adaptively adjusted according to design requirements.

[0146] In some embodiments, the two sub-support portions 311 and the crown portion 32 may be an integrally formed structure, or may be formed by stacking different materials in sequence.

[0147] Specifically, the material of the crown portion 32 includes metal titanium, which is a titanium metal layer; the material of the sub-support portion 311 includes any one of metal aluminum and metal molybdenum. For example, the material of the sub-support portion 311 close to the substrate 1 includes metal molybdenum, which is a molybdenum metal layer; the material of the sub-support portion 311 far from the substrate 1 includes metal aluminum, which is an aluminum metal layer.

[0148] See also Figure 3 The first electrode 42 can overlap with the side wall of the molybdenum metal layer close to the isolation opening 301; or, the first electrode 42 can overlap with the side wall of the molybdenum metal layer and the aluminum metal layer close to the isolation opening 301 at the same time.

[0149] The display panel 10 further includes an encapsulation layer. Figure 3 and Figure 5 .

[0150] The encapsulation layer includes a plurality of encapsulation units 5 arranged at intervals. The encapsulation units 5 are arranged opposite to the isolation openings 301 and are used to encapsulate the light-emitting devices 4 arranged in the isolation openings 301 .

[0151] Specifically, the packaging unit 5 includes a first packaging portion 51 and a second packaging portion 52 connected to each other. The first packaging portion 51 is located on the side of the first electrode 42 facing away from the substrate 1 and covers the side wall of the isolation structure 3 facing the isolation opening 301. The second packaging portion 52 is located on the side of the isolation structure 3 facing away from the substrate 1.

[0152] See also Figure 3 and Figure 5 The first packaging portion 51 covers the side of the light-emitting device 4 facing away from the substrate 1, and covers at least part of the side wall of the isolation structure 3 facing the isolation opening 301, and is connected to the second packaging portion 52 located on the side of the isolation structure 3 facing away from the substrate 1 through the crown 32 of the isolation structure 3.

[0153] There is a gap between the second packaging portion 52 and the surface of the isolation structure 3 facing away from the substrate 1 . At this time, the second packaging portion 52 is suspended relative to the isolation structure 3 .

[0154] In any isolation opening 301 , the packaging unit 5 composed of the first packaging part 51 and the second packaging part 52 is a continuous film layer structure, so as to provide a better packaging effect for the isolation structure 3 and the light-emitting device 4 located in the isolation opening 301 .

[0155] In a certain pixel opening 201, if the inclination angle 23 corresponding to the pixel opening 201 is small, after the light emitting device 4 is arranged in the isolation opening 301 corresponding to the pixel opening 201, the side of the light emitting device 4 facing away from the substrate 1 can form a relatively gentle morphology. When the packaging unit 5 packages the isolation structure 3 and the light emitting device 4 located in the isolation opening 301, the relatively gentle morphology helps to reduce the packaging difficulty, avoid cracks caused by the packaging film layer being too thin in some areas, and affect the final packaging effect.

[0156] After the isolation opening 301 is encapsulated by the encapsulation layer, another film layer structure needs to be provided on the side of the encapsulation layer facing away from the substrate 1 to further planarize and encapsulate the display panel 10 .

[0157] Specifically, the side of the encapsulation layer facing away from the substrate 1 is further provided with at least one film layer structure selected from the group consisting of a planarization layer, an organic encapsulation film layer, an inorganic encapsulation film layer, a touch layer, an organic adhesive layer, and a cover plate.

[0158] Taking the planarization layer as an example, the material of the planarization layer may include at least one of an organic material and an inorganic material, for example, an organic polymer (such as polyimide, acrylic resin, etc.) or an inorganic material (such as silicon oxide, silicon nitride, etc.).

[0159] The planarization layer made of organic material can be prepared by IJP (Ink-Jet Printing) and other technologies. Part of the planarization layer can flow into the isolation opening 301 and improve the flatness of the display panel 10 by filling the isolation opening 301, while also providing certain protection for the related film layers located thereunder; the other part of the planarization layer can also cover the first encapsulation part 51 and fill the gap formed between the first encapsulation part 51 and the isolation structure 3. The surface of the planarization layer finally prepared on the side facing away from the substrate 1 is a flat surface.

[0160] It can be understood that the display panel 10 provided in the embodiment of the present application can adjust the morphology of the first side wall 21 of the pixel definition layer 2 pointing to one end of the pixel opening 201 so that it is inclined relative to the first bottom wall 22 and forms an inclination angle 23 of no more than 60° with the first bottom wall 22, which can reduce the climbing difficulty of the first electrode 42 prepared at the first side wall 21, improve the continuity of the first electrode 42 at the first side wall 21, and reduce the possibility of the first electrode 42 breaking or falling off at this place as much as possible, which helps to reduce the impedance of the first electrode 42 at this place, ensure that the relevant light-emitting device 4 has a relatively uniform light-emitting brightness, and reduce the probability of display defects such as pixel dark spots. This structure can improve the reliability of the display panel 10 and improve the display effect and performance of the display panel 10.

[0161] This application also provides another display panel, see Figure 1-Figure 5 .

[0162] The display panel 10 includes a substrate 1 and a pixel definition layer 2, wherein the pixel definition layer 2 is located on one side of the substrate 1. In a direction perpendicular to the surface of the substrate 1, the initial thickness of the pixel definition layer 2 at various positions is substantially the same.

[0163] The pixel definition layer 2 is provided with a plurality of pixel openings 201. The pixel definition layer 2 includes a first side wall 21 facing the pixel opening 201, and the pixel definition layer 2 also includes a first bottom wall 22 facing the substrate 1. In a direction perpendicular to the plane where the substrate 1 is located, an end of the first side wall 21 close to the substrate 1 intersects with the first bottom wall 22 and forms an inclination angle 23.

[0164] See also Figure 2The multiple pixel openings 201 include at least a first opening 201a and a second opening 201b arranged at intervals along the extension direction of the pixel definition layer 2. The pixel definition layer 2 can form an inclination angle 23 at any pixel opening 201 (for example, the first opening 201a, or the second opening 201b, or other openings). The inclination angles at different pixel openings 201 can be the same or different.

[0165] In some embodiments, at least the inclination angle 23 at the first opening 201 a is different from the inclination angle 23 at the second opening 201 b .

[0166] Specifically, the inclination angle 23 of the first opening 201 a is greater than the inclination angle 23 of the second opening 201 b .

[0167] The above-mentioned inclination angle 23 can affect the display effect of the display panel 10 to a certain extent. When the inclination angle 23 of the pixel opening 201 is small, the light emitted by the light emitting device 4 experiences relatively less shielding and reflection when it is emitted, so more light can be emitted smoothly; in contrast, when the inclination angle 23 is large, the light emitted by the light emitting device 4 may be more blocked and folded when it is emitted through the pixel opening 201, resulting in an increase in the loss of the emitted light, thereby affecting the light brightness and the display effect.

[0168] Based on this principle, considering that the required luminous brightness of light-emitting devices 4 of different colors may be different, in the present application, the inclination angle 23 of the pixel opening 201 corresponding to the light-emitting devices 4 of different colors can be adjusted to different angles based on this requirement, so as to achieve adjustment of the luminous brightness of light-emitting devices 4 of different colors to a certain extent, so as to improve the color balance imbalance and color cast that may exist in the display panel 10, and improve the accuracy and richness of the color display of the display panel 10.

[0169] See also Figure 3 and Figure 4 , there is a gap between the orthographic projection of the end of the first side wall 21 formed at a certain pixel opening 201 facing away from the substrate 1 and the orthographic projection of the end close to the substrate 1 on the substrate 1, and the orthographic projection of the end facing away from the substrate 1 on the substrate 1 is located outside the orthographic projection of the end close to the substrate 1 on the substrate 1 (that is, located outside the pixel opening 201). The first side wall 21 and the first bottom wall 22 intersect to form an inclination angle 23 pointing to the middle of the pixel opening 201, and the angle of the inclination angle 23 is not greater than 60°.

[0170] The above angle limitation can further improve the function of the light emitting device 4 while satisfying the requirement of adjusting the light emitting effect of the light emitting device 4 corresponding to the pixel opening 201 .

[0171] Specifically, the inclined first side wall 21 makes the film thickness of the pixel definition layer 2 slowly increase toward the side away from the pixel opening 201, so that the thickness of the film layer area where the first side wall 21 for supporting the subsequent process is located changes more gently, which helps the subsequent film layer to smoothly adhere and overlap at the first side wall 21, thereby achieving the purpose of reducing the difficulty of climbing the subsequent film layer at the first side wall 21, and making the corresponding film layer achieve better continuity at this location, avoiding the film layer impedance from being affected, and reducing the display abnormality caused by the poor continuity of the film layer at the first side wall 21. This structural improvement helps to improve the display effect and reliability of the display panel 10, and can improve the performance of the display panel 10 to a certain extent.

[0172] For example, when the surface of the first side wall 21 needs to overlap the light emitting device 4, the relatively flat first side wall 21 can enable the light emitting device 4 to overlap smoothly along the first side wall 21, which helps to improve the continuity of the film layer.

[0173] In some embodiments, the surface of the first side wall 21 is a smooth surface, or may be a low-roughness surface.

[0174] In order to facilitate processing of the pixel definition layer 2 and obtain the above-mentioned inclination angle 23 , in some embodiments, the material of the pixel definition layer 2 includes an inorganic material.

[0175] In this embodiment, the pixel definition layer 2 can be processed by dry etching to obtain the pixel opening 201 and the above-mentioned inclination angle 23 .

[0176] Dry etching has directionality, so it can ensure that the prepared pixel opening 201 is etched more accurately, and the edge of the first side wall 21 surrounding the pixel opening 201 is clear and regular, and the morphology meets the design requirements.

[0177] Specifically, the inclination angle 23 is not less than 30°.

[0178] See also Figure 3 The angle range of the above-mentioned inclination angle 23 is 30° to 60°, and its specific numerical range can be adjusted according to actual needs. For example, the angle can be any value among 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0179] In other embodiments, the angle range of the inclination angle 23 may be set to 40° to 50°. In this case, the inclination angle 23 may be any value of 30°, 35°, 40°, 45°, 50°, etc.

[0180] When the inclination angle 23 is too large, the first side wall 21 will be steeper, which will affect the thickness and continuity of the film layer subsequently attached there; when the inclination angle 23 is too small, the length of the first side wall 21 extending toward the pixel opening 201 will be too long, affecting the opening size of the pixel opening 201, and also affecting the display effect of the display panel 10.

[0181] It should also be noted that the contact portion between the first side wall 21 and the first bottom wall 22 cannot be located on the side of the first side wall 21 away from the pixel opening 201. In this case, the circumferential side edge of the pixel definition layer 2 close to the pixel opening 201 will form a reverse taper structure, which will further increase the difficulty of overlapping the subsequent film layer with the first side wall 21, and may even cause the cathode to break directly at this location.

[0182] The display device 4 mentioned above includes a light-emitting functional layer 41, a first electrode 42 and a second electrode 43, and the structure thereof will be described in detail below.

[0183] The light-emitting functional layer 41 is arranged corresponding to the pixel opening 201. The light-emitting functional layer 41 can cover the pixel opening 201 and at least a portion of the first side wall 21, and the first electrode 42 covers the side of the light-emitting functional layer 41 that is away from the substrate 1; the second electrode 43 is located between the pixel definition layer 2 and the substrate 1, and the orthographic projection of the pixel opening 201 on the substrate 1 is located within the orthographic projection of the second electrode 43 on the substrate 1, and the light-emitting functional layer 41 contacts the second electrode 43 through the pixel opening 201.

[0184] Specifically, the light-emitting functional layer 41 can be made of organic small molecule light-emitting materials, complex light-emitting materials, and high molecular polymers. Different light-emitting functional layers 41 can be used to emit light of different colors. Generally speaking, there are three types of light-emitting functional layers 41, which are used to emit red, green, and blue light, respectively.

[0185] In different isolation openings 301 , one or more of the three different light-emitting functional layers 41 can be arranged respectively according to design requirements.

[0186] See also Figure 3 The light-emitting functional layer 41 includes a first light-emitting sub-portion 411 and a second light-emitting sub-portion 412 . The first light-emitting sub-portion 411 covers the pixel opening 201 , and the second light-emitting sub-portion 412 covers at least a portion of the first side wall 21 .

[0187] The light-emitting functional layer 41 can be prepared by evaporation. The larger the angle of the inclination angle 23, the smaller the thickness of the second light-emitting sub-portion 412 formed by evaporation on the first side wall 21. Accordingly, the difficulty of the first electrode 42 located on the side of the light-emitting functional layer 41 facing away from the substrate 1 to climb along the second light-emitting sub-portion 412 is higher, and the possibility of the first electrode 42 having a film discontinuity defect on the side of the second light-emitting sub-portion 412 facing away from the substrate 1 is higher. When a discontinuity defect occurs in the first electrode 42, the impedance of the first electrode 42 becomes larger, affecting the display effect of the light-emitting device 4, resulting in low brightness of the light-emitting device 4.

[0188] See also Figure 4 , at the same pixel opening 201 , the thickness of the second light-emitting sub-portion 412 is less than the thickness of the first light-emitting sub-portion 411 .

[0189] When there are different inclination angles 23 formed at different pixel openings 201, take the first opening 201a and the second opening 201b as an example. The first opening 201a and the second opening 201b are arranged at intervals on the pixel definition layer 2, and the inclination angle 23 formed at the first opening 201a is greater than the inclination angle 23 formed at the second opening 201b. Accordingly, the thickness ratio of the second light-emitting sub-section 412 provided at the first opening 201a to the corresponding first light-emitting sub-section 411 is less than the thickness ratio of the second light-emitting sub-section 412 provided at the second opening 201b to the corresponding first light-emitting sub-section 411.

[0190] The thickness ratio of the second light-emitting sub-portion 412 to the first light-emitting sub-portion 411 is negatively correlated with the angle of inclination 23 .

[0191] In another embodiment, the second light-emitting sub-section 412 disposed at the first opening 201a has the same light-emitting color as the second light-emitting sub-section 412 disposed at the second opening 201b, and the thickness of the second light-emitting sub-section 412 disposed at the first opening 201a is smaller than the thickness of the second light-emitting sub-section 412 disposed at the second opening 201b.

[0192] The greater the thickness ratio of the second light-emitting sub-section 412 to the corresponding first light-emitting sub-section 411, or the greater the thickness of the second light-emitting sub-section 412, the less difficult it is for the first electrode 42 located on the side of the light-emitting functional layer 41 facing away from the substrate 1 to climb along the second light-emitting sub-section 412, and the lower the possibility of discontinuity defects of the first electrode 42 on the second light-emitting sub-section 412. Therefore, without changing other processing conditions, adjusting the inclination angle 23 helps to improve the film continuity of the first electrode 42, so as to reduce the impedance of the first electrode 42 and optimize the display effect of the light-emitting device 4.

[0193] In addition, the thickness of the second light-emitting sub-portion 412 will also affect the heating of the first electrode 42 during operation to a certain extent. If the second light-emitting sub-portion 412 is too thin, the first electrode 42 may generate local overheating when powered on, thereby accelerating the aging and degradation of the material of the first electrode 42 and reducing the stability and service life of the first electrode 42.

[0194] The second light-emitting sub-portion 412 of the light-emitting functional layer 41 is attached to the surface of the first side wall 21. Figure 4 Affected by the inclined first side wall 21 , the thickness d2 of the second light-emitting sub-portion 412 is smaller than the thickness d1 of the first light-emitting sub-portion 411 .

[0195] In some embodiments, the orthographic projection of the second light-emitting sub-portion 412 on the substrate 1 coincides with the orthographic projection of the first side wall 21 on the substrate 1 , and the second light-emitting sub-portion 412 covers the first side wall 21 of the pixel definition layer 2 .

[0196] When the inclination angle 23 of the pixel definition layer 2 is between 30° and 60°, the thickness d2 of the second light-emitting sub-portion 412 located in the same pixel opening 201 is not less than 50% of the thickness d1 of the first light-emitting sub-portion 411 .

[0197] In this embodiment, when the inclination angle 23 is 60°, the thickness of the second light-emitting sub-portion 412 is 50% of the thickness of the first light-emitting sub-portion 411 ; when the inclination angle 23 is 30°, the thickness of the second light-emitting sub-portion 412 is 95% of the thickness of the first light-emitting sub-portion 411 .

[0198] Specifically, in the same pixel opening 201 , the thickness ratio of the second light-emitting sub-portion 412 to the first light-emitting sub-portion 411 is 50% to 95%.

[0199] By adjusting the angle of the inclination angle 23, the thickness of the second light-emitting sub-portion 412 attached to the first side wall 21 can be adjusted without changing other parameters, so as to help reduce the difficulty of the first electrode 42 climbing above the first side wall 21, thereby achieving the effect of improving the impedance of the first electrode 42.

[0200] In other similar embodiments, the light-emitting functional layer 41 includes a first light-emitting subsection 411, a second light-emitting subsection 412 and a third light-emitting subsection 413. The structures of the first light-emitting subsection 411 and the second light-emitting subsection 412 are as described above, and the third light-emitting subsection 413 is located on the side of the pixel definition layer 2 facing away from the substrate 1; in the same pixel opening 201, the second light-emitting subsection 412 is located between the first light-emitting subsection 411 and the third light-emitting subsection 413 and connects the first light-emitting subsection 411 and the third light-emitting subsection 413.

[0201] Specifically, the thickness d3 of the third light-emitting sub-portion 413 is not greater than the thickness d1 of the first light-emitting sub-portion 411 .

[0202] Affected by the evaporation angle, the thickness d3 of the third light-emitting sub-portion 413 may be substantially consistent with the thickness d1 of the first light-emitting sub-portion 411 , or may be slightly smaller than the thickness d1 of the first light-emitting sub-portion 411 .

[0203] The film thickness of the first light-emitting sub-unit 411 at different positions is substantially consistent.

[0204] In this embodiment, the display panel 10 further includes an isolation structure 3, and the isolation structure 3 is located on the side of the pixel definition layer 2 facing away from the substrate 1. The structure of the isolation structure 3 is described above and will not be repeated here.

[0205] The isolation structure 3 encloses a plurality of isolation openings 301 . The isolation openings 301 are arranged correspondingly to and connected with the pixel openings 201 . The orthographic projection of the pixel opening 201 on the substrate 1 is located within the orthographic projection of the isolation openings 301 on the substrate 1 .

[0206] The first electrode 42 in the light emitting device 4 covers the side of the light emitting functional layer 41 facing away from the substrate 1 and contacts the side wall of the isolation structure 3 facing the isolation opening 301 .

[0207] Specifically, the first electrode 42 overlaps a portion of the side wall of the isolation structure 3 close to the substrate 1 .

[0208] The display panel 10 further includes an encapsulation layer. Figure 3 and Figure 5 .

[0209] The encapsulation layer includes a plurality of encapsulation units 5 arranged at intervals. The encapsulation units 5 are arranged opposite to the isolation openings 301 and are used to encapsulate the light-emitting devices 4 arranged in the isolation openings 301 .

[0210] Specifically, the packaging unit 5 includes a first packaging portion 51 and a second packaging portion 52 connected to each other. The first packaging portion 51 is located on the side of the first electrode 42 facing away from the substrate 1 and covers the side wall of the isolation structure 3 facing the isolation opening 301. The second packaging portion 52 is located on the side of the isolation structure 3 facing away from the substrate 1.

[0211] See also Figure 3 and Figure 5 The first packaging portion 51 covers the side of the light-emitting device 4 facing away from the substrate 1, and covers at least part of the side wall of the isolation structure 3 facing the isolation opening 301, and is connected to the second packaging portion 52 located on the side of the isolation structure 3 facing away from the substrate 1 through the crown 32 of the isolation structure 3.

[0212] There is a gap between the second packaging portion 52 and the surface of the isolation structure 3 facing away from the substrate 1 . At this time, the second packaging portion 52 is suspended relative to the isolation structure 3 .

[0213] In any isolation opening 301 , the packaging unit 5 composed of the first packaging part 51 and the second packaging part 52 is a continuous film layer structure, so as to provide a better packaging effect for the isolation structure 3 and the light-emitting device 4 located in the isolation opening 301 .

[0214] In a certain pixel opening 201, if the inclination angle 23 corresponding to the pixel opening 201 is small, after the light emitting device 4 is arranged in the isolation opening 301 corresponding to the pixel opening 201, the side of the light emitting device 4 facing away from the substrate 1 can form a relatively gentle morphology. When the packaging unit 5 packages the isolation structure 3 and the light emitting device 4 located in the isolation opening 301, the relatively gentle morphology helps to reduce the packaging difficulty, avoid cracks caused by the packaging film layer being too thin in some areas, and affect the final packaging effect.

[0215] After the isolation opening 301 is encapsulated by the encapsulation layer, another film layer structure needs to be provided on the side of the encapsulation layer facing away from the substrate 1 to further planarize and encapsulate the display panel 10 .

[0216] Specifically, the side of the encapsulation layer facing away from the substrate 1 is further provided with at least one film layer structure selected from the group consisting of a planarization layer, an organic encapsulation film layer, an inorganic encapsulation film layer, a touch layer, an organic adhesive layer, and a cover plate.

[0217] Taking the planarization layer as an example, the material of the planarization layer may include at least one of an organic material and an inorganic material, for example, an organic polymer (such as polyimide, acrylic resin, etc.) or an inorganic material (such as silicon oxide, silicon nitride, etc.).

[0218] The planarization layer made of organic material can be prepared by IJP (Ink-Jet Printing) and other technologies. Part of the planarization layer can flow into the isolation opening 301 and improve the flatness of the display panel 10 by filling the isolation opening 301, while also providing certain protection for the related film layers located thereunder; the other part of the planarization layer can also cover the first encapsulation part 51 and fill the gap formed between the first encapsulation part 51 and the isolation structure 3. The surface of the planarization layer finally prepared on the side facing away from the substrate 1 is a flat surface.

[0219] It can be understood that the display panel 10 provided in the embodiment of the present application can adjust the display effect of the display panel 10 by adjusting the angle of the inclination 23 within the multiple pixel openings 201 formed on the pixel definition layer 2, and improve the accuracy and richness of the color display of the display panel 10 to a certain extent.

[0220] The embodiment of the present application also provides a method for preparing the display panel 10 .

[0221] The preparation method comprises:

[0222] Step S1, preparing a pixel material layer on one side of the substrate 1;

[0223] Step S2, preparing an isolation material layer on the side of the pixel material layer facing away from the substrate 1;

[0224] Step S3, etching and patterning the isolation material layer to form an isolation structure 3, wherein the isolation structure 3 encloses an isolation opening 301;

[0225] Step S4, etching and patterning the pixel material layer to form a pixel definition layer 2, the pixel definition layer 2 encloses a pixel opening 201, and the pixel opening 201 is arranged corresponding to the isolation opening 301;

[0226] Step S5 , forming a light emitting device 4 in the isolation opening 301 , wherein the light emitting device 4 covers the pixel opening 201 .

[0227] In the above step S4, the pixel material layer is etched and patterned by dry etching to obtain a pixel definition layer 2 and a pixel opening 201 that conform to the structure described above, wherein the first side wall 21 used to form the pixel opening 201 and the first bottom wall 22 of the pixel definition layer 2 can form an angle 23 in the range of 30° to 60°. The morphology of the intermediate structure prepared at this time can be referred to in Figure 6 .

[0228] In step S5 , the light-emitting functional layer 41 and the first electrode 42 in the light-emitting device 4 are sequentially evaporated and attached to the first side wall 21 .

[0229] The above method can be used to prepare a pixel definition layer 2 structure having an inclined first side wall 21 .

[0230] In a third aspect, the present application further provides a display device 100, comprising the display panel 10 described in any one of the above items, and its structure is shown in FIG. Figure 7 .

[0231] The display device 100 provided in the embodiment of the present application can be a mobile phone, a notebook, a tablet computer, a smart watch, a smart bracelet, a navigator, a display, a personal digital assistant (PDA), and other products or components with display functions.

[0232] Since the display panel 10 in the display device 100 has any one or several of the above-mentioned beneficial effects of the display panel 10 , the display device 100 at least includes any one or several of the above-mentioned beneficial effects of the display panel 10 . The specific effects are described above and will not be repeated here.

[0233] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: Substrate (1); A pixel definition layer (2) is located on one side of the substrate (1), the pixel definition layer (2) is provided with a plurality of pixel openings (201), the pixel definition layer (2) comprises a first side wall (21) facing the pixel openings (201), and the pixel definition layer (2) further comprises a first bottom wall (22) facing the substrate (1); Wherein, in a direction perpendicular to the plane where the substrate (1) is located, an end of the first side wall (21) close to the substrate (1) intersects with the first bottom wall (22) and forms an inclination angle (23), and the inclination angle (23) is not greater than 60°.

2. The display panel according to claim 1, characterized in that: The material of the pixel definition layer (2) includes inorganic material.

3. The display panel according to claim 1, characterized in that: The inclination angle (23) is not less than 30°; Preferably, the inclination angle (23) is in the range of 40° to 50°.

4. The display panel according to claim 1, characterized in that: An isolation structure (3) is provided on the side of the pixel definition layer (2) facing away from the substrate (1), the isolation structure (3) encloses a plurality of isolation openings (301), the isolation openings (301) are arranged correspondingly to and connected with the pixel openings (201), and the orthographic projection of the pixel opening (201) on the substrate (1) is located within the orthographic projection of the isolation opening (301) on the substrate (1).

5. The display panel according to claim 4, characterized in that: The display panel (10) further comprises a light-emitting device layer, the light-emitting device layer being located on the substrate (1) and comprising a plurality of light-emitting devices (4) located in the corresponding isolation openings (301), the light-emitting devices (4) comprising a light-emitting functional layer (41) and a first electrode (42), the light-emitting functional layer (41) covering the pixel opening (201) and the light-emitting functional layer (41) covering at least a portion of the first side wall (21), the first electrode (42) covering a side of the light-emitting functional layer (41) facing away from the substrate (1) and contacting a side wall of the isolation structure (3) facing the isolation opening (301); Preferably, the first electrode (42) overlaps a portion of a side wall of the isolation structure (3) close to the substrate (1).

6. The display panel according to claim 5, characterized in that: The light-emitting functional layer (41) comprises a first light-emitting sub-portion (411) and a second light-emitting sub-portion (412), wherein the first light-emitting sub-portion (411) covers the pixel opening (201), and the second light-emitting sub-portion (412) covers at least a portion of the first side wall (21), and the thickness of the second light-emitting sub-portion (412) is less than the thickness of the first light-emitting sub-portion (411); Preferably, the plurality of pixel openings (201) include at least a first opening (201a) and a second opening (201b) that are spaced apart, and the inclination angle (23) of the first opening (201a) is greater than the inclination angle (23) of the second opening (201b); Preferably, a thickness ratio of the second light-emitting sub-portion (412) disposed at the first opening (201a) to the corresponding first light-emitting sub-portion (411) is smaller than a thickness ratio of the second light-emitting sub-portion (412) disposed at the second opening (201b) to the corresponding first light-emitting sub-portion (411); Preferably, the second light-emitting sub-portion (412) disposed at the first opening (201a) emits the same light-emitting color as the second light-emitting sub-portion (412) disposed at the second opening (201b), and the thickness of the second light-emitting sub-portion (412) disposed at the first opening (201a) is smaller than the thickness of the second light-emitting sub-portion (412) disposed at the second opening (201b); Preferably, the thickness ratio of the second light-emitting sub-portion (412) to the first light-emitting sub-portion (411) is negatively correlated with the angle of the inclination (23); Preferably, the orthographic projection of the second light-emitting sub-portion (412) on the substrate (1) coincides with the orthographic projection of the first side wall (21) on the substrate (1).

7. The display panel according to claim 6, characterized in that: In the same pixel opening (201), the thickness of the second light-emitting sub-section (412) is not less than 50% of the thickness of the first light-emitting sub-section (411); Preferably, within the same pixel opening (201), the thickness ratio of the second light-emitting sub-section (412) to the first light-emitting sub-section (411) is 50% to 95%; preferably, when the inclination angle (23) is 60°, the thickness of the second light-emitting sub-section (412) is 50% of the thickness of the first light-emitting sub-section (411); Preferably, when the inclination angle (23) is 30°, the thickness of the second light-emitting sub-portion (412) is 95% of the thickness of the first light-emitting sub-portion (411).

8. The display panel according to claim 6, characterized in that: The light-emitting functional layer (41) further comprises a third light-emitting sub-section (413), and the third light-emitting sub-section (413) is located on a side of the pixel definition layer (2) facing away from the substrate (1); In the same pixel opening (201), the second light-emitting subsection (412) is located between the first light-emitting subsection (411) and the third light-emitting subsection (413) and connects the first light-emitting subsection (411) and the third light-emitting subsection (413); Preferably, the orthographic projection of the third light-emitting sub-unit (413) on the substrate (1) is spaced apart from the orthographic projection of a side of the isolation structure (3) close to the substrate (1) on the substrate (1); Preferably, within the same pixel opening (201), the thickness of the third light-emitting sub-section (413) is not greater than the thickness of the first light-emitting sub-section (411).

9. The display panel according to claim 5, characterized in that: The light emitting device (4) further comprises a second electrode (43), wherein the second electrode (43) is located between the pixel definition layer (2) and the substrate (1), and the orthographic projection of the pixel opening (201) on the substrate (1) is located within the orthographic projection of the second electrode (43) on the substrate (1); The light-emitting functional layer (41) contacts the second electrode (43) through the pixel opening (201).

10. The display panel according to any one of claims 4 to 9, characterized in that: The isolation structure (3) comprises a support portion (31) and a crown portion (32), wherein the crown portion (32) is located on a side of the support portion (31) facing away from the substrate (1); The orthographic projection of the support portion (31) on the substrate (1) is located within the orthographic projection of the crown portion (32) on the substrate (1); Preferably, the support portion (31) comprises at least two superimposed sub-support portions (311), and an orthographic projection of the sub-support portion (311) farther from the substrate (1) on the substrate (1) is located within an orthographic projection of the sub-support portion (311) closer to the substrate (1) on the substrate (1); Preferably, the orthographic projection of the sub-support portion (311) closest to the substrate (1) on the substrate (1) is located within the orthographic projection of the crown portion (32) on the substrate (1); Preferably, in a direction perpendicular to the plane where the substrate (1) is located, the cross-sectional profile of the portion of the sub-support portion (311) located between two adjacent isolation openings (301) is one of a rectangle, a trapezoid and an inverted trapezoid; Preferably, in a direction perpendicular to the plane where the substrate (1) is located, the cross-sectional profile of the portion of the crown (32) located between two adjacent isolation openings (301) is any one of a trapezoid, a rectangle and an inverted trapezoid; Preferably, the material of the crown (32) includes metal titanium; Preferably, the material of the sub-support portion (311) includes any one of metal aluminum and metal molybdenum.

11. The display panel according to any one of claims 5 to 9, characterized in that: The display panel (10) further comprises an encapsulation layer, the encapsulation layer comprising a plurality of encapsulation units (5) arranged at intervals, the encapsulation unit (5) comprising a first encapsulation portion (51) and a second encapsulation portion (52) connected to each other, the first encapsulation portion (51) being located on a side of the first electrode (42) facing away from the substrate (1) and covering a side wall of the isolation structure (3) facing the isolation opening (301), and the second encapsulation portion (52) being located on a side of the isolation structure (3) facing away from the substrate (1); Preferably, there is a gap between the second packaging portion (52) and a surface of the isolation structure (3) on a side facing away from the substrate (1).

12. A display panel, characterized in that: include: Substrate (1); A pixel definition layer (2) is located on one side of the substrate (1), the pixel definition layer (2) is provided with a plurality of pixel openings (201), the pixel definition layer (2) comprises a first side wall (21) facing the pixel openings (201), and the pixel definition layer (2) further comprises a first bottom wall (22) facing the substrate (1); Wherein, in a direction perpendicular to the plane where the substrate (1) is located, an end of the first side wall (21) close to the substrate (1) intersects with the first bottom wall (22) and forms an inclination angle (23); the multiple pixel openings (201) at least include a first opening (201a) and a second opening (201b) arranged at intervals, and the inclination angle (23) of the first opening (201a) is greater than the inclination angle (23) of the second opening (201b).

13. The display panel according to claim 12, characterized in that: The display panel further comprises a light-emitting functional layer (41) arranged corresponding to the pixel opening (201), wherein the light-emitting functional layer (41) covers the pixel opening (201) and covers at least a portion of the first side wall (21); The light-emitting functional layer (41) comprises a first light-emitting sub-portion (411) and a second light-emitting sub-portion (412), wherein the first light-emitting sub-portion (411) covers the pixel opening (201), and the second light-emitting sub-portion (412) covers at least a portion of the first side wall (21), and the thickness of the second light-emitting sub-portion (412) is smaller than the thickness of the first light-emitting sub-portion (411); preferably, the thickness ratio of the second light-emitting sub-portion (412) provided at the first opening (201a) to the corresponding first light-emitting sub-portion (411) is smaller than the thickness ratio of the second light-emitting sub-portion (412) provided at the second opening (201b) to the corresponding first light-emitting sub-portion (411); Preferably, the second light-emitting sub-portion (412) disposed at the first opening (201a) emits the same light-emitting color as the second light-emitting sub-portion (412) disposed at the second opening (201b), and the thickness of the second light-emitting sub-portion (412) disposed at the first opening (201a) is smaller than the thickness of the second light-emitting sub-portion (412) disposed at the second opening (201b); Preferably, the thickness ratio of the second light-emitting sub-portion (412) to the first light-emitting sub-portion (411) is negatively correlated with the angle of the inclination (23); Preferably, the orthographic projection of the second light-emitting sub-portion (412) on the substrate (1) coincides with the orthographic projection of the first side wall (21) on the substrate (1).

14. The display panel according to claim 13, characterized in that: In the same pixel opening (201), the thickness of the second light-emitting sub-section (412) is not less than 50% of the thickness of the first light-emitting sub-section (411); Preferably, within the same pixel opening (201), the thickness ratio of the second light-emitting sub-section (412) to the first light-emitting sub-section (411) is 50% to 95%; Preferably, when the inclination angle (23) is 60°, the thickness of the second light-emitting sub-portion (412) is 50% of the thickness of the first light-emitting sub-portion (411); Preferably, when the inclination angle (23) is 30°, the thickness of the second light-emitting sub-portion (412) is 95% of the thickness of the first light-emitting sub-portion (411).

15. The display panel according to claim 12, characterized in that: The angle of the inclination (23) in any pixel opening (201) is no greater than 60°; Preferably, the inclination angle (23) is not less than 30°; Preferably, the inclination angle (23) is in the range of 40° to 50°.

16. The display panel according to claim 12, characterized in that: The material of the pixel definition layer (2) includes inorganic material.

17. The display panel according to claim 13, characterized in that: An isolation structure (3) is provided on the side of the pixel definition layer (2) facing away from the substrate (1), the isolation structure (3) encloses a plurality of isolation openings (301), the isolation openings (301) are arranged correspondingly to and connected with the pixel openings (201), and the orthographic projection of the pixel opening (201) on the substrate (1) is located within the orthographic projection of the isolation opening (301) on the substrate (1).

18. The display panel according to claim 17, characterized in that: The display panel further comprises a first electrode (42) located in the corresponding isolation opening (301), the first electrode (42) covering a side of the light-emitting functional layer (41) facing away from the substrate (1) and contacting a side wall of the isolation structure (3) facing the isolation opening (301); Preferably, the first electrode (42) overlaps a portion of the side wall of the isolation structure (3) close to the substrate (1); Preferably, the display panel further comprises a second electrode (43), the second electrode (43) being located between the pixel definition layer (2) and the substrate (1), the orthographic projection of the pixel opening (201) on the substrate (1) being located within the orthographic projection of the second electrode (43) on the substrate (1), and the light-emitting functional layer (41) being in contact with the second electrode (43) via the pixel opening (201).

19. The display panel according to claim 18, characterized in that: The display panel (10) further comprises an encapsulation layer, the encapsulation layer comprising a plurality of encapsulation units (5) arranged at intervals, the encapsulation unit (5) comprising a first encapsulation portion (51) and a second encapsulation portion (52) connected to each other, the first encapsulation portion (51) being located on a side of the first electrode (42) facing away from the substrate (1) and covering a side wall of the isolation structure (3) facing the isolation opening (301), and the second encapsulation portion (52) being located on a side of the isolation structure (3) facing away from the substrate (1); Preferably, there is a gap between the second packaging portion (52) and a surface of the isolation structure (3) on a side facing away from the substrate (1).

20. A display device, characterized in that: A display panel (10) comprising any one of claims 1 to 19.

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