Display panel and display device

Abstract

Embodiments of the present disclosure provide a display panel and a display device, relating to the field of display technologies, for improving the problem of uneven film formation of the light-emitting functional pattern within the opening of the pixel defining layer. The display panel includes a substrate and a pixel defining layer disposed on the substrate. The pixel defining layer includes a first portion and a second portion. The first portion has a plurality of slits disposed along a first direction, and the second portion includes a plurality of barrier walls. A plurality of barrier walls are disposed in one slit, and the plurality of barrier walls divide the slit into a plurality of openings distributed along a second direction. The height of the first portion is greater than the height of the second portion, and the first direction intersects the second direction. The slit includes a strip-shaped portion extending along the second direction and a plurality of protruding portions communicating with the strip-shaped portion. In the first direction, the plurality of protruding portions protrude from the strip-shaped portion. Two adjacent ones of the plurality of slits are a first slit and a second slit. In the second direction, a part of a protruding portion of the second slit is located between two adjacent protruding portions of the first slit.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display panel and a display device. Background Art

[0002] Organic light-emitting display devices have advantages such as self-luminescence, fast response, wide viewing angle, high brightness, vivid colors, thinness and lightness, and thus have become an important display technology.

[0003] Currently, the organic light-emitting functional patterns of organic light-emitting display devices can be formed by an inkjet printing process. Specifically, a pixel defining layer can be fabricated on a substrate in advance to define the precise dropping of ink droplets into the designated sub-pixel regions. Generally, the above-mentioned pixel defining layer has a plurality of openings. In the inkjet printing process, first, ink droplets are dropped into the openings formed by the pixel defining layer, and then, the ink can be dried so that the ink dries into a film to form a light-emitting functional pattern in the opening.

[0004] However, during the process of the ink drying into a film in the inkjet printing process, the solvent vapor in the ink volatilizes relatively fast at the edge region of the ink droplet, which will cause the solution in the ink droplet to flow from the center to the edge. This flow will drive the solute in the ink to migrate towards the edge of the ink droplet and finally deposit at the edge, forming a deposition morphology with a thick edge and a thin center, thereby making the film formation of the light-emitting functional pattern in the opening uneven, which may lead to the problem of uneven light emission of the light-emitting device corresponding to the opening, seriously affecting the display effect of the organic light-emitting display device. Summary of the Invention

[0005] Embodiments of the present invention provide a display panel and a display device, aiming to improve the problem of uneven film formation of the light-emitting functional pattern in the opening of the pixel defining layer.

[0006] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0007] In a first aspect, a display panel is provided. The display panel includes a substrate and a pixel defining layer disposed on the substrate. The pixel defining layer includes a first part and a second part. The first part has a plurality of slits disposed along a first direction, and the second part includes a plurality of barriers. A plurality of barriers are disposed in one slit, and the plurality of barriers divide the slit into a plurality of openings distributed along a second direction. The height of the first part is greater than the height of the second part, and the first direction intersects with the second direction. The slit includes a strip-shaped part extending along the second direction and a plurality of protruding parts communicating with the strip-shaped part. In the first direction, the plurality of protruding parts protrude from the strip-shaped part. Among them, two adjacent ones of the plurality of slits are a first slit and a second slit. In the second direction, a part of a protruding part of the second slit is located between two adjacent protruding parts of the first slit.

[0008] In some embodiments, the orthographic projection of a protruding portion of a slit on the substrate is a rectangle.

[0009] In some embodiments, in a slit, the orthographic projection of the edge of the side wall of a protruding portion away from the substrate on the substrate includes: a curve protruding in a direction away from the strip portion.

[0010] In some embodiments, in a slit, the maximum dimension of a protruding portion in the second direction is greater than or equal to the dimension of the strip portion in the first direction.

[0011] In some embodiments, between the strip portions of the first slit and the strip portions of the second slit, the protruding portions of the first slit and the protruding portions of the second slit are alternately arranged.

[0012] In some embodiments, multiple protruding portions of a slit form multiple pairs of protruding portions. The two protruding portions in each pair of protruding portions are respectively located on both sides of the strip portion of the slit in the first direction, and in the first direction, these two protruding portions are flush.

[0013] In some embodiments, the dimension of an opening in the first direction is larger in the middle and smaller on both sides; or, the dimension of an opening in the first direction is smaller in the middle and larger on both sides.

[0014] In some embodiments, the maximum dimension of an opening in the first direction is equal to the maximum dimension of the opening in the second direction.

[0015] In some embodiments, in the first direction, a barrier rib provided in the first slit is flush with a barrier rib provided in the second slit; or, in the first direction, a barrier rib provided in the first slit is opposite to an opening in the second slit.

[0016] In some embodiments, the surface of the second part of the pixel defining layer is a hydrophilic surface, and the surface of the first part of the pixel defining layer away from the substrate is a hydrophobic surface.

[0017] In some embodiments, the display panel further includes an auxiliary electrode and an electrode layer. The auxiliary electrode is disposed on the side of the pixel defining layer close to the substrate; the electrode layer is disposed on the side of the pixel defining layer away from the substrate. The first part of the pixel defining layer further has an auxiliary electrode opening, and the auxiliary electrode opening is disposed between the first slit and the second slit. The electrode layer is coupled to the auxiliary electrode through the auxiliary electrode opening.

[0018] In a second aspect, a display device is provided, including the display panel provided in any of the above embodiments.

[0019] In the display panel provided by the embodiments of the present disclosure, since the height of the first part of the pixel defining layer is greater than that of the second part, in the inkjet printing process, the inks in the respective openings in a slit can communicate with each other. In this way, during the drying process of the ink, in the second direction, the ink only climbs along the two sidewalls of the slit in the second direction, and the inks in the respective middle openings can all form a film uniformly, which can improve the film forming uniformity of the light-emitting functional patterns in the openings, thereby improving the light-emitting uniformity of the light-emitting devices corresponding to the respective middle openings, and further improving the display effect of the display panel.

[0020] In addition, since the slit includes a strip portion and a plurality of protruding portions communicating with the strip portion, in the first direction, the maximum dimension of the slit in the first direction is relatively large, and the ink can be relatively flat over a larger area. In this way, the film forming uniformity of the light-emitting functional patterns in the respective openings can be improved, and further the light-emitting uniformity of the light-emitting devices can be improved.

[0021] In addition, since a part of a protruding portion of the second slit can be located between two adjacent protruding portions of the first slit, the space between the two adjacent protruding portions of the first slit can be utilized to arrange the protruding portion of the second slit in this space, so that on the premise that the slit has a protruding portion, when the size of the display panel in the first direction is fixed, more slits can be arranged in the display panel, and the display panel can have a higher resolution.

[0022] It can be understood that the display device described in the second aspect includes the above display panel. Therefore, the beneficial effects it can achieve can refer to the beneficial effects of the display panel in the above text, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural diagram of a display device according to some embodiments;

[0025] Figure 2 Structural diagram of a display panel according to some embodiments;

[0026] Figure 3 Top view of a display panel according to some embodiments;

[0027] Figure 4 For Figure 3 Cross-sectional view of the display panel in along the section line AA';

[0028] Figure 5A is Figure 3 a cross-sectional view of the display panel in along the section line BB';

[0029] Figure 5B is a cross-sectional view of the display panel according to some embodiments;

[0030] Figure 6 is Figure 3 a partially enlarged view of the display panel in ;

[0031] Figure 7A is a top view of the display panel in the related art;

[0032] Figure 7B is a process flow chart for manufacturing the display panel in the related art;

[0033] Figure 8 is Figure 3 a partially enlarged view of the display panel in ;

[0034] Figure 9 is Figure 3 a partially enlarged view of the display panel in ;

[0035] Figure 10 is a top view of the display panel according to some embodiments;

[0036] Figure 11 is Figure 10 a cross-sectional view of the display panel in along the section line CC';

[0037] Figure 12 is a top view of the display panel according to some embodiments;

[0038] Figure 13 is a top view of the display panel according to some embodiments;

[0039] Figure 14 is Figure 13 a partially enlarged view of the display panel in ;

[0040] Figure 15 is Figure 3 a partially enlarged view of the display panel in ;

[0041] Figure 16 is a process flow chart for manufacturing the display panel by using an inkjet printing process;

[0042] Figure 17 is a top view of the display panel according to some embodiments. Detailed implementation manners

[0043] Next, in conjunction with the accompanying drawings, the technical solutions in some embodiments of the present disclosure will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present disclosure.

[0044] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular form "comprises" and the present participle form "comprising", are construed in an open, inclusive sense, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example", or "some examples", etc. are intended to indicate that the specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0045] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0046] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components have direct physical contact or electrical contact with each other. Another example is that when describing some embodiments, the term "coupled" may be used to indicate that two or more components have direct physical contact or electrical contact. However, the term "coupled" or "communicatively coupled" may also mean that two or more components have no direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0047] "At least one of A, B, and C" has the same meaning as "at least one of A, B, or C", and both include the following combinations of A, B, and C: only A, only B, only C, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0048] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0049] The use of "configured to" in this document means open and inclusive language, which does not exclude devices configured to perform additional tasks or steps.

[0050] In addition, the use of "based on" means open and inclusive because a process, step, calculation, or other action "based on" one or more of the stated conditions or values can in practice be based on additional conditions or values beyond the stated ones.

[0051] As used herein, "substantially" or "approximately" includes the stated value and an average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by a person of ordinary skill in the art considering the measurement being discussed and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system).

[0052] As used herein, "parallel", "perpendicular", "equal" include the stated situation and situations similar to the stated situation, where the range of the similar situation is within an acceptable deviation range, and the acceptable deviation range is determined by a person of ordinary skill in the art considering the measurement being discussed and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range of approximate parallelism can be, for example, within 5° deviation; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range of approximate perpendicularity can also be, for example, within 5° deviation. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range of approximate equality can be, for example, that the difference between the two equal ones is less than or equal to 5% of either one of them.

[0053] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can be that the layer or element is directly on the other layer or substrate, or there can also be an intermediate layer between the layer or element and the other layer or substrate.

[0054] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions is exaggerated for clarity. Thus, variations in the shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Accordingly, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but include shape deviations resulting from, for example, manufacturing. For example, an etched region shown as rectangular will typically have curved features. Thus, the regions shown in the drawings are schematic in nature, and their shapes are not intended to depict the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0055] Embodiments of the present disclosure provide a display device. Figure 1 The structure diagram of a display device according to some embodiments is shown in FIG. Figure 1 As shown, the display device 1 is a product with an image display function (including: static images or dynamic images, where the dynamic image can be a video). For example, the display device 1 can be any one of a monitor, a television, a billboard, a digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a digital camera, a portable video camera, a viewfinder, a navigator, a vehicle, a large-area wall, a household appliance, an information query device (such as a business query device in parts of e-government, banks, hospitals, power, etc.), a monitor, etc.

[0056] The display device 1 may include a display panel 10, and the display device 1 may further include a driving control circuit 20 coupled to the display panel 10. The driving control circuit 20 is configured to provide an electrical signal to the display panel 10. Exemplarily, the driving control circuit 20 may include: a data driving circuit 210 (which may also be referred to as a source driver, Source Driver IC), and the data driving circuit 210 is configured to provide a data driving signal (also referred to as a data signal) to the display panel 10. The driving control circuit 20 may further include a timing control circuit 220 (which may also be referred to as a timing controller, Timer Control Register, abbreviated as TCON) coupled to the data driving circuit 210, etc.

[0057] In some embodiments, the driving control circuit 20 may further include a scan driving circuit 230. In other embodiments, the scan driving circuit 230 may be integrated in the display panel 10, that is to say, the display panel 10 may include the scan driving circuit 230. Since the scan driving circuit 230 is disposed on the display panel 10, the scan driving circuit 230 may also be referred to as GOA (Gate Driver on Array, a scan driving circuit disposed on an array substrate).

[0058] Specifically, the timing control circuit 220 can be coupled to the scan driver circuit 230 and can also be coupled to the data driver circuit 210. The timing control circuit 220 can be configured to receive display signals, which can include, for example, a power signal, a video image signal, a communication signal (such as a signal corresponding to the IIC communication protocol), and a mode control signal (such as a mode control signal corresponding to a test mode or a mode control signal corresponding to a normal display mode), etc. Among them, the video image signal is, for example, a MIPI (Mobile Industry Processor Interface) signal, an LVDS (Low-Voltage Differential Signaling) signal. The video image signal can include: image data and a timing control signal. The image data can include, for example, pixel data of multiple sub-pixels, and the pixel data can be RGB data, etc. The timing control signal can include, for example, a data enable signal (Data Enable, which can be abbreviated as DE), a horizontal synchronization signal (Hsync, which can be abbreviated as HS), and a vertical synchronization signal (Vsync, which can be abbreviated as VS).

[0059] The timing control circuit 220 can also be configured to output a first control signal and image data to the data driver circuit 210 and output a second control signal to the scan driver circuit 230 in response to the display signals. Among them, the first control signal is configured to control the working timing of the data driver circuit 210, and the second control signal is configured to control the working timing of the scan driver circuit 230.

[0060] The data driver circuit 210 can be configured to convert the received image data into data signals of multiple sub-pixels P (to be described below) in the display panel 10 and output the data signals to the pixel driver circuits DC (to be described below) in the corresponding sub-pixels P according to the working timing determined by the first control signal. The scan driver circuit 230 is configured to output scan signals to the pixel driver circuits DC in multiple sub-pixels P according to the working timing determined by the second control signal.

[0061] Some embodiments of the present disclosure also provide a display panel. The display panel can be used as the display panel in the display device provided in any of the above embodiments. Of course, the display panel can also be applied to other display devices, and the embodiments of the present disclosure do not limit this.

[0062] Figure 2 It is a structural diagram of a display panel according to some embodiments. It should be noted that Figure 2 only the structure of the display area of the display panel is shown, and the structure of the peripheral area is omitted. For example, the scan driver circuit is omitted.

[0063] See Figure 2 , the display panel 10 can be one of an OLED (Organic Light Emitting Diode) display panel, a QLED (Quantum Dot Light Emitting Diodes) display panel, and a micro-LED (including: MiniLED or MicroLED, where LED is a light emitting diode) display panel.

[0064] The display panel 10 has a display area AA and a peripheral area SA. The peripheral area SA can be located on at least one side of the display area AA (for example, one side; or, around, that is, including the upper and lower sides and the left and right sides).

[0065] The display panel 10 includes a plurality of sub-pixels P disposed in the display area AA. Through the light emitted by the plurality of sub-pixels P, the display panel 10 can display a predetermined image in the display area AA. Specifically, the plurality of sub-pixels P can include a plurality of sub-pixels with different emission colors. Exemplarily, the plurality of sub-pixels P include a first sub-pixel P1, a second sub-pixel P2, and a third sub-pixel P3. The first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 emit three primary color lights respectively. For example, the first sub-pixel P1 can emit red light, the second sub-pixel P2 can emit green light, and the third sub-pixel P3 can emit blue light.

[0066] A sub-pixel P can include a light emitting device E and a pixel driving circuit DC coupled to the light emitting device E.

[0067] Among them, the light emitting device E can be one of an organic light emitting diode OLED, a quantum dot light emitting diode QLED, and a light emitting diode LED.

[0068] The pixel driving circuit DC can be configured to provide an electrical signal (such as a driving voltage or a driving current) to the light emitting device E coupled to the pixel driving circuit DC in response to a received scan signal and a data signal, so as to drive the light emitting device E to emit light, thereby enabling the display panel 10 to display an image.

[0069] The pixel driving circuit DC can include a plurality of transistors and at least one (for example, one; or, a plurality of) capacitors. For example, the pixel driving circuit DC can have a structure such as "2T1C", "6T1C", "7T1C", "6T2C", or "7T2C", etc. Here, "T" represents a transistor, for example, a thin film transistor. The number in front of "T" represents the number of transistors. "C" represents a capacitor, and the number in front of "C" represents the number of capacitors.

[0070] Figure 3A top view of a display panel according to some embodiments. Figure 4 is Figure 3 a cross-sectional view of the display panel in Figure 5A is Figure 3 a cross-sectional view of the display panel in Figure 3 along the section line BB'. It should be noted that

[0071] Referring to Figure 4 and Figure 5A the display panel 10 includes a substrate 110. The substrate 110 can be rigid or flexible. When the substrate 110 is a rigid substrate, the material forming the rigid substrate can be glass. When the substrate 110 is a flexible substrate, the material forming the flexible substrate can be PI (polyimide), PET (polyethylene terephthalate), ultra-thin glass, etc.

[0072] Continuing to refer to Figure 4 and Figure 5A as described above, the display panel 10 includes a plurality of light-emitting devices E. A light-emitting device E (for example, each light-emitting device E) can be implemented as shown in Figure 4 and Figure 5A . It should be noted that hereinafter, the structure of the light-emitting device E will be described by taking the light-emitting device E as an organic light-emitting diode as an example. It can be understood that when the light-emitting device E is other types of light-emitting devices, its structure can be similar to the structure of the organic light-emitting diode, and can refer to the following description, which will not be elaborated here.

[0073] Specifically, the light-emitting device E can include a first electrode 121, a second electrode 122, and one or more light-emitting functional patterns 123 located between the first electrode 121 and the second electrode 122. It should be noted that Figure 4 and Figure 5A the number of light-emitting functional patterns in the light-emitting device shown in

[0074] The second electrode 122 can be disposed on a side of the first electrode 121 away from the substrate 110. Exemplarily, along the thickness direction of the display panel 10 (e.g., parallel to the Z-axis direction), the substrate 110, the first electrode 121, and the second electrode 122 can be sequentially disposed. In some embodiments, the first electrode 121 is an anode, and correspondingly, the second electrode 122 is a cathode. The second electrode 122 can be transparent or semi-transparent. In this way, the second electrode 122 can allow the light emitted by the light-emitting functional pattern 123 to pass through the second electrode 122 and exit. At this time, the light-emitting device E can be a top-emission type light-emitting device. The material of the second electrode 122 can include metals or alloys, such as metals like magnesium (Mg), titanium (Ti), silver (Ag), etc., or alloys formed by multiple metals. The material of the second electrode 122 can also include metal compounds, such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0075] Continuing to refer to Figure 4 and Figure 5A , the material of the first electrode 121 can include metal compounds, such as indium tin oxide (ITO) or indium zinc oxide (IZO). In some embodiments, the light-emitting device E is a top-emission type light-emitting device. At this time, the first electrode 121 can further include a reflective electrode. The material of the reflective electrode can be a metal or an alloy, such as metals like magnesium (Mg), titanium (Ti), silver (Ag), etc., or alloys formed by multiple metals. The reflective electrode can be configured to reflect light. For example, the reflective electrode can reflect the light emitted by the light-emitting functional pattern 123 in the direction of the first electrode 121, so that this part of the light can also exit from the side of the second electrode 122, which can improve the light extraction efficiency of the display panel 10.

[0076] Continuing to refer to Figure 4 and Figure 5A , the light-emitting functional pattern 123 can include a light-emitting pattern, and the light-emitting pattern is, for example, an organic light-emitting pattern. The light-emitting pattern can emit light. For example, the light-emitting pattern can emit red light, green light, blue light, or white light. The light-emitting functional pattern 123 can further include one or more of a hole injection pattern, a hole transport pattern, and an electron blocking pattern located between the light-emitting pattern and the anode (e.g., the first electrode 121). The light-emitting functional pattern 123 can further include one or more of an electron injection pattern, an electron transport pattern, and a hole blocking pattern located between the light-emitting pattern and the cathode (e.g., the second electrode 122). The material of one of the above hole injection pattern, hole transport pattern, electron blocking pattern, electron injection pattern, electron transport pattern, and hole blocking pattern can include an organic material.

[0077] In some embodiments, among multiple light-emitting devices E, the first electrodes of two adjacent light-emitting devices E may be independent patterns separated from each other. The second electrodes 122 of two adjacent light-emitting devices E may be connected to each other. For example, the second electrodes 122 of each light-emitting device E in the display panel may be connected to each other to form a continuous film layer (hereinafter referred to as the second electrode continuous film layer).

[0078] In addition, a light-emitting function pattern (such as a light-emitting pattern, a hole injection pattern, a hole transport pattern, an electron blocking pattern, an electron injection pattern, an electron transport pattern, and a hole blocking pattern) of multiple light-emitting devices E (such as multiple light-emitting devices corresponding to a column of sub-pixels) may be independent patterns separated from each other or may be connected to each other. Exemplarily, Figure 5A in the display panel of, the light-emitting function patterns of multiple light-emitting devices E may be independent patterns separated from each other. Also exemplarily, referring to Figure 5B , Figure 5B is a cross-sectional view of a display panel according to some other embodiments. Figure 5B in the display panel of, the light-emitting function patterns of multiple light-emitting devices E may be connected to each other. For example, the light-emitting function patterns of multiple light-emitting devices E in a column of sub-pixels corresponding to a slit may be connected to each other to form a light-emitting function continuous pattern (which will be described below).

[0079] Based on the above, for a light-emitting device E (such as each light-emitting device E), a portion of the second electrode continuous film layer that is directly opposite to the first electrode (that is, the orthographic projection of the second electrode continuous film layer on the first electrode overlaps with the first electrode) may be defined as the second electrode of the light-emitting device E. Similarly, a portion of a light-emitting function continuous pattern that is directly opposite to the first electrode (that is, the orthographic projection of the light-emitting function continuous pattern on the first electrode overlaps with the first electrode) may be defined as the light-emitting function pattern of the light-emitting device E.

[0080] Continuing to refer to Figure 4 and Figure 5A , the display panel 10 may further include a circuit layer 130 and a planarization layer 140.

[0081] Among them, the circuit layer 130 may include at least one conductor layer and at least one interlayer insulating layer. At least one interlayer insulating layer is disposed between two conductor layers, and these two conductor layers may be separated by at least one interlayer insulating layer. The circuit layer 130 may be coupled to the light-emitting device E. The circuit layer 130 may form the pixel driving circuit described above.

[0082] The planarization layer 140 may be disposed on a side of the circuit layer 130 away from the substrate 110 and on a side of the plurality of light-emitting devices E close to the substrate 110. Since the planarization layer 140 is provided, the light-emitting devices E can be relatively flat. Exemplarily, the first electrode 121 in the light-emitting devices E can be relatively flat, and thus, the performance of the light-emitting devices E can be improved.

[0083] Continuing to refer to Figure 4 and Figure 5A , the display panel 10 further includes a pixel defining layer 150. The pixel defining layer 150 is disposed on the substrate 110. Exemplarily, the pixel defining layer 150 may be disposed on a side of the planarization layer 140 away from the substrate 110. The material of the pixel defining layer 150 may include an organic material, for example, including polyimide.

[0084] Refer to Figure 3 , Figure 4 and Figure 5A , the pixel defining layer 150 includes a first portion 151 and a second portion 152.

[0085] Refer to Figure 3 , the first portion 151 has a plurality of slits St (such as slit St1 and slit St2) disposed along a first direction, where the first direction is, for example, parallel to the X-axis direction. A slit St (such as each slit St) may extend along a second direction, where the second direction intersects the first direction. Exemplarily, the second direction is perpendicular to the first direction. For example, the first direction is parallel to the X-axis direction and the second direction is parallel to the Y-axis direction. It should be noted that in this article, the X-axis, Y-axis, and Z-axis are perpendicular to each other and can form a three-dimensional rectangular coordinate system. Further, the plurality of slits St may be parallel or approximately parallel to each other. For example, each slit St extends along the second direction.

[0086] Continuing to refer to Figure 3 , the second portion 152 includes a plurality of barrier walls Bk. A plurality of barrier walls Bk are disposed in a slit St (such as each slit St), and the plurality of barrier walls Bk divide the slit St into a plurality of openings H distributed along the second direction (such as parallel to the Y-axis direction).

[0087] In some embodiments, for a plurality of barriers Bk located in a slit St (such as each slit St), a barrier Bk (such as each barrier Bk) can be in contact with the sidewalls w1 and w2 of the slit St and extend from the sidewall w1 to the sidewall w2 of the slit St, where the sidewalls w1 and w2 can be the two sidewalls of the slit St distributed along a first direction (such as parallel to the X-axis direction). In this way, the barrier Bk can divide the slit St into two openings H distributed along a second direction (such as parallel to the Y-axis direction). Similarly, a plurality of barriers Bk can divide the slit St into a plurality of openings H distributed along the second direction. In some possible implementation manners, the extending direction of a barrier Bk (such as each barrier Bk) is parallel to the first direction.

[0088] In some embodiments, the width of a barrier Bk (such as each barrier Bk) (for example, the dimension of the barrier in the second direction) is greater than or equal to 2 µm, such as 2 µm, 2.2 µm, 2.5 µm, 2.7 µm, 3.0 µm, 3.2 µm, 3.5 µm, 3.7 µm, 4.0 µm, 4.5 µm or 5.0 µm.

[0089] Continuing to refer to Figure 3 , an opening H (such as each opening H) can be configured to define a sub-pixel P (such as sub-pixel P1, sub-pixel P2 or sub-pixel P3). For example, an opening H can define the light-emitting region of the corresponding sub-pixel P. Exemplarily, in a sub-pixel P, at least a part (such as, part; or, the whole) of the light-emitting device E can be disposed in an opening H.

[0090] Furthermore, referring to Figure 4 , Figure 5A and Figure 5B , in the pixel defining layer 150, the height d1 of the first part 151 is greater than the height d2 of the second part 152. Wherein, the height d1 of the first part 151 is, for example, the dimension of the first part 151 along the thickness direction of the display panel 10 (such as parallel to the Z-axis direction). Similarly, the height of the second part 152 is, for example, the dimension of the second part 152 along the thickness direction of the display panel 10. Based on this, it can also be said that for a slit St and a plurality of barriers Bk disposed in the slit St, the height of the sidewall of the slit St (i.e., the height d1 of the first part 151) is greater than the height of the barrier Bk (i.e., the height d2 of the second part 152).

[0091] Exemplarily, the height d1 of the first portion 151 of the pixel defining layer is 1.2 µm to 1.5 µm, such as 1.2 µm, 1.3 µm, 1.4 µm, or 1.5 µm. The height d2 of the second portion 152 of the pixel defining layer is 0.3 µm to 1 µm, such as 0.3 µm, 0.4 µm, 0.5 µm, 0.6 µm, 0.7 µm, 0.8 µm, 0.9 µm, or 1.0 µm.

[0092] Next, in combination with the manufacturing process of the display panel, the beneficial effects that can be achieved by the above structure of the pixel defining layer 150 will be described.

[0093] In the manufacturing process of the display panel, an inkjet printing method can be used to form a light-emitting functional pattern (such as a light-emitting pattern, a hole injection pattern, a hole transport pattern, an electron blocking pattern, an electron injection pattern, an electron transport pattern, or a hole blocking pattern) in one or more light-emitting devices. In the inkjet printing process, first, the nozzle drops ink droplets into the openings formed in the pixel defining layer, and then, the ink can be dried so that the ink dries into a film to form a light-emitting functional pattern in the opening. However, in the inkjet printing process, the inkjet amounts of the respective nozzles may be different, such that the amounts of ink dropped into different openings are different, which may cause the problem that the thicknesses of the light-emitting functional patterns in different openings are different. In addition, during the process of the ink drying into a film in the inkjet printing process, the solvent vapor in the ink volatilizes faster in the edge region of the ink droplet, which will cause the solution flow of the ink droplet from the center to the edge. This flow will drive the solute in the ink to migrate to the edge of the ink droplet and finally deposit at the edge, forming a deposition morphology with a thick edge and a thin center, so that the film formation of the light-emitting functional pattern in the opening is relatively uneven, which may cause the problem of uneven light emission of the light-emitting device corresponding to the opening.

[0094] See Figure 3 、 Figure 4 、 Figure 5A and Figure 5B , in the display panel provided by the embodiments of the present disclosure, since the height d1 of the first portion 151 of the pixel defining layer is greater than the height d2 of the second portion 152, therefore, in the inkjet printing process, the ink in each opening H in a slit St can be connected. In this way, the defect caused by the error of the inkjet amounts between multiple nozzles can be improved. In addition, during the ink drying process, in the second direction (such as the direction parallel to the Y axis), the ink only climbs at the two side walls of the slit St in the second direction, and the ink in each intermediate opening H can be uniformly formed into a film, thereby improving the film formation uniformity of the light-emitting functional pattern in the opening H, improving the light emission uniformity of the light-emitting device E corresponding to the intermediate opening H, and further improving the display effect of the display panel 10.

[0095] Based on the above, in some embodiments, in the process of fabricating the light-emitting functional pattern 123 using an inkjet printing process, the inks (such as the inks for forming the light-emitting functional pattern, hereinafter referred to as the light-emitting functional pattern inks) in the respective openings H in a slit St can communicate with each other. After the inks are dried and formed into films, the light-emitting functional patterns 123 in the multiple openings H in the slit St can be connected to each other to form a continuous light-emitting functional pattern. In other embodiments, in the process of fabricating the light-emitting functional pattern 123 using an inkjet printing process, the inks in the respective openings H in a slit St can communicate with each other. After the inks are dried and formed into films, the light-emitting functional patterns 123 in the multiple openings H corresponding to a slit St can also be separated from each other.

[0096] In addition, since in the process of fabricating the light-emitting functional pattern 123 using an inkjet printing process, the inks in the respective openings H in a slit St can communicate with each other, accordingly, a column of sub-pixels P corresponding to a slit St can emit light of the same color. Correspondingly, two adjacent columns of sub-pixels P corresponding to adjacent slits St can emit light of different colors to achieve the normal display function of the display panel 10.

[0097] A halftone mask plate can be used to fabricate the pixel defining layer 150, so as to achieve that the height of the first part 151 in the pixel defining layer 150 is greater than the height of the second part 152. The first part 151 and the second part 152 of the pixel defining layer can also be fabricated separately. For example, by first fabricating the second part 152 of the pixel defining layer and then fabricating the first part 151 of the pixel defining layer, it is also possible to achieve that the height of the first part 151 in the pixel defining layer 150 is greater than the height of the second part 152.

[0098] Figure 6 For Figure 3 is a partial enlarged view of the display panel, showing a column of sub-pixels corresponding to a slit. Refer to Figure 6 , in the multiple slits St formed in the first part of the pixel defining layer, a slit St (such as each slit St) includes a strip-shaped portion L extending along the second direction (such as parallel to the Y-axis direction) and a plurality of protruding portions D.

[0099] Among them, the strip-shaped portion L can extend from one end of the slit St along the second direction to the other end. At various positions along its extending direction (such as parallel to the second direction) of the strip-shaped portion L, the dimension of the strip-shaped portion L along the first direction can be substantially the same. Exemplarily, the orthographic projection of the strip-shaped portion L on the substrate can be a rectangle extending along the second direction. It should be noted that in this article, a rectangle can be a right-angled rectangle or a rounded rectangle, and those skilled in the art can know that it is a rectangular shape or substantially a rectangular shape.

[0100] Continue to refer to Figure 6, a plurality of protruding portions D communicate with the strip portion L. Moreover, the plurality of protruding portions D protrude from the strip portion L in a first direction (e.g., parallel to the X-axis direction). Exemplarily, one protruding portion D (e.g., each protruding portion D) may be located on one side of the strip portion L in the first direction.

[0101] Figure 7A is a top view of a display panel in the related art. Refer to Figure 7A , in the display panel of the related art, the slit St’ has no protruding portion, and in the first direction, the maximum dimension t1 of the slit St’ in the first direction may be small. In contrast, in Figure 6 the display panel provided by the embodiment of the present disclosure shown, since the slit St includes a strip portion L and a plurality of protruding portions D communicating with the strip portion L, therefore, in the first direction, the maximum dimension t1 of the slit St in the first direction (e.g., the dimension of the slit at a protruding portion D in the first direction) is large, and the ink can be relatively flat over a larger area. In this way, the thickness uniformity of the light-emitting functional pattern in each sub-pixel can be improved, and further the light-emitting uniformity of the light-emitting device can be improved.

[0102] In addition, continue to refer to Figure 6 and Figure 7A , in the inkjet printing process, for a slit St, since the slit St has a plurality of protruding portions D, therefore, compared with Figure 7A the slit St’ without protruding portions shown, the flow resistance of the ink in the slit St with a plurality of protruding portions D is greater. In this way, when there is a foreign object (particle) in the slit St, due to the greater flow resistance of the ink in the slit St, the pulling force of the foreign object on the ink can be alleviated, the aggregation of the ink at the foreign object can be reduced, the thickness uniformity of the light-emitting functional pattern in each sub-pixel corresponding to the slit St can be improved, and further the light-emitting uniformity of the light-emitting device can be improved.

[0103] Figure 7B is a process flow chart for manufacturing a display panel in the related art. Refer to Figure 7B , in the inkjet printing process, when there is a foreign object between two adjacent slits St’, the ink in these two slits St’ may aggregate at the foreign object, which may cause the ink in these two slits St’ to communicate with each other, and further cause problems with the two columns of sub-pixels corresponding to these two slits St’.

[0104] In contrast, refer to Figure 3 and Figure 6, in the display panel provided by the embodiments of the present disclosure, since a slit St (such as each slit St) includes a strip portion L and a plurality of protruding portions D communicating with the strip portion L, therefore, the side walls of the slit St in the first direction (such as parallel to the X-axis direction) are relatively tortuous. In other words, the shape of the slit St is relatively irregular. Due to the relatively tortuous side walls and relatively irregular shape of the slit St, the pulling force of the slit St on the ink can be relatively large, which can improve the aggregation of the ink in the slit. Thus, when there is a foreign object on one side of the slit St (such as one side along the X-axis direction), the above structure of the slit St can relieve the pulling force of the foreign object on the ink in the slit St, reduce the aggregation of the ink at the foreign object, and improve the problem of defective sub-pixels in the entire column caused by the foreign object. Further, when there is a foreign object between two adjacent slits St, the above structure of the slit St can relieve the pulling force of the foreign object on the ink (such as the light-emitting layer ink) in the slit St, reduce the aggregation of the ink at the foreign object, and can improve the problem of defective adjacent two columns of sub-pixels caused by the foreign object.

[0105] Continue to refer to Figure 3 , among the multiple slits St formed in the pixel defining layer 150, two adjacent ones are the first slit St1 and the second slit St2. Exemplarily, among the multiple slits St formed in the pixel defining layer 150, two adjacent ones along the first direction (such as parallel to the X-axis direction) are the first slit St1 and the second slit St2. It should be noted that in this article, two adjacent slits St can mean that there are no other slits between these two slits.

[0106] Further, refer to Figure 8 , Figure 8 is Figure 3 a partial enlarged view of the display panel in Figure 8 , showing a part of the first slit St1 and a part of the second slit St2. Refer to

[0107] See Figure 3 , in some embodiments, as described above, in the first direction, adjacent two columns of sub-pixels corresponding to two adjacent slits St can emit light of different colors. Therefore, when fabricating the light-emitting layers of the light-emitting devices in these two columns of sub-pixels through an inkjet printing process, the ink of the light-emitting layers of different colors located in these two slits St cannot communicate. Based on this, between two adjacent slits St, the size of the first part 151 of the pixel defining layer cannot be too small, and its minimum size is the size that does not cause the overflow of the ink in the two columns.

[0108] Figure 9 is Figure 3 a partial enlarged view of the display panel in Figure 8 , showing two columns of sub-pixels corresponding to the first slit and the second slit. See

[0109] See Figure 6 , in some embodiments, the orthographic projection of a protruding portion D of the slit St on the substrate is a rectangle. Exemplarily, the orthographic projections of the respective protruding portions D of a slit St (e.g., each slit St) on the substrate are rectangles. In some possible implementation manners, the long side direction of the above rectangular orthographic projection may be parallel to the first direction (e.g., parallel to the X-axis direction), and the short side direction may be parallel to the second direction (e.g., parallel to the Y-axis direction). In some other possible implementation manners, the long side direction of the rectangular orthographic projection may be parallel to the second direction (e.g., parallel to the Y-axis direction), and the short side direction may be parallel to the first direction (e.g., parallel to the X-axis direction).

[0110] Since the orthographic projection of a protruding portion D of the slit St on the substrate is a rectangle, therefore, the area of an opening H (e.g., each opening H) located in the slit St can be relatively large.

[0111] In addition, since the positive projection of a protruding portion D of the slit St on the substrate is rectangular, the side walls of the slit St in the first direction may have a plurality of relatively sharp corners. In this way, on the one hand, in the inkjet printing process, the flow resistance of the ink in the slit St is relatively large. When there is a foreign object in the slit St, due to the relatively large flow resistance of the ink in the slit St, the pulling force of the foreign object on the ink can be alleviated, the accumulation of the ink at the foreign object can be reduced, the thickness uniformity of the light-emitting functional pattern in each sub-pixel corresponding to the slit St can be improved, and further the light-emitting uniformity of the light-emitting device can be improved. On the other hand, the pulling force of the slit St on the ink can be relatively large, which can improve the accumulation of the ink in the slit. When there is a foreign object on one side of the slit St (for example, one side along the X-axis direction), the above structure of the slit St can alleviate the pulling force of the foreign object on the ink in the slit St, reduce the accumulation of the ink at the foreign object, and improve the problem of defective sub-pixels in the entire column caused by the foreign object. Further, when there is a foreign object between two adjacent slits St, the above structure of the slit St can alleviate the pulling force of the foreign object on the ink (such as the light-emitting layer ink) in the slit St, reduce the accumulation of the ink at the foreign object, and can improve the problem of defective adjacent two columns of sub-pixels caused by the foreign object.

[0112] Figure 10 It is a top view of a display panel according to some embodiments. Figure 11 is Figure 10 a cross-sectional view of the display panel in Figure 10 along the section line CC'. It should be noted that Figure 3 the number and arrangement of multiple sub-pixels in Figure 10 are only illustrative, and the embodiments of the present disclosure do not limit this. In addition, compared with Figure 3 the display panel of

[0113] See Figure 10 and Figure 11 In some embodiments, in a slit St (for example, each slit St) of the display panel 10, the positive projection of the edge WA' of a side wall WA of a protruding portion D (for example, each protruding portion D) far from the substrate 110 on the substrate 110 includes: a curve CL protruding in a direction away from the strip portion L. Exemplarily, the entire positive projection of the edge WA' of a side wall WA of a protruding portion D (for example, each protruding portion D) far from the substrate 110 on the substrate 110 is a curve protruding in a direction away from the strip portion L.

[0114] Since the orthographic projection of the edge WA' of the side wall WA of a protruding portion D away from the substrate 110 includes a curve CL protruding in the direction away from the strip portion L, the side wall of the slit St along the first direction (for example, parallel to the X-axis direction) can be a relatively flat surface. In this way, in the inkjet printing process, at the protruding portion D of the slit St, the thickness uniformity of the film layer formed after the ink is dried into a film is better, which can improve the thickness uniformity of the light-emitting functional pattern in the sub-pixel, and further improve the light emission uniformity of the light-emitting device.

[0115] Figure 12 is a top view of a display panel according to some embodiments. It should be noted that, compared to Figure 3 Display panel, Figure 12 Except for the size of the slits (which will be described in detail below), the rest of the structure of the display panel can be the same as Figure 3 Same display panel as in.

[0116] See also Figure 3 In some embodiments, in a slit St (for example, each slit St) of the display panel 10, a maximum dimension m1 of a protrusion D (for example, each protrusion D) in a second direction (for example, parallel to the Y-axis direction) is equal to a dimension m2 of the strip portion L of the slit St in the first direction (for example, parallel to the X-axis direction).

[0117] Specifically, for the strip portion L of a slit St, referring to the above description, at each location of the strip portion L along its extending direction, the size m2 of the strip portion L in the first direction may be substantially the same. For the protruding portion D of a slit St, for example, referring to Figure 3 , and referring to the above description, in a slit St (for example, each slit St) of the display panel 10, the orthographic projection of a protrusion D (for example, each protrusion D) on the substrate is a rectangle. In this case, the maximum dimension m1 of the protrusion D in the second direction may be the dimension of the orthographic projection of the rectangle in the second direction, for example, the length of the long side or the short side of the orthographic projection of the rectangle. For example, see Figure 10 , and referring to the above description, the orthographic projection of the edge WA' of the side wall of a protrusion D (for example, each protrusion D) away from the substrate on the substrate includes a curve CL protruding in a direction away from the strip portion L. At this time, the maximum dimension m1 of the protrusion D in the second direction can be the dimension of the line between the two endpoints N1 and N2 of the curve in the second direction.

[0118] Continue to see Figure 3 and Figure 10, since in a slit St of the display panel 10, the maximum dimension m1 of a protruding portion D in the second direction is equal to the dimension m2 of the strip portion L of the slit St in the first direction, the shape of the orthographic projection of each opening H located in the slit St on the substrate can be relatively symmetrical. In the inkjet printing process, the film forming uniformity of the ink in the opening can be relatively good, and the light emitting uniformity of the light emitting device can be improved.

[0119] In some other embodiments, refer to Figure 12 , in a slit St (such as each slit St) of the display panel 10, the maximum dimension m1 of a protruding portion D (such as each protruding portion D) in the second direction (such as the direction parallel to the Y axis) is greater than the dimension m2 of the strip portion L in the first direction (such as the direction parallel to the X axis). Among them, the description of the maximum dimension m1 of the protruding portion D in the second direction and the dimension m2 of the strip portion L in the first direction can refer to the relevant description above, and will not be elaborated here. Since in a slit St of the display panel 10, the maximum dimension m1 of a protruding portion D in the second direction is greater than the dimension m2 of the strip portion L in the first direction, the dimension of the protruding portion D in the second direction is relatively large, so that the film forming uniformity of the ink in the protruding portion D is relatively good, and the film forming uniformity of the ink in the opening H can be relatively good, and the light emitting uniformity of the light emitting device can be improved.

[0120] Refer to Figure 6 , in some embodiments, multiple protruding portions D of a slit St (such as each slit St) of the display panel form multiple pairs of protruding portions. The two protruding portions D in each pair of protruding portions are respectively located on both sides of the strip portion L of the slit St in the first direction (such as the direction parallel to the X axis). For example, in a pair of protruding portions (such as each pair of protruding portions), one protruding portion D is located on one side of the strip portion L along the positive X axis direction, and the other protruding portion is located on the other side of the strip portion L along the negative X axis direction. And, in the first direction, the two protruding portions D in each pair of protruding portions are flush.

[0121] It should be noted that in this article, in the first direction, A and B (A or B is, for example, a protruding portion, or A or B is, for example, a retaining wall) being flush can mean that: in the first direction, at least a part (such as part; or, for example, all) of B faces A. Exemplarily, in the direction perpendicular to the arrangement direction of A and B, that is, in the second direction, the two edges of A along the second direction are flush with or retracted from the two edges of B along the second direction. For example, the two edges of A along the second direction are respectively flush with the two edges of B along the second direction.

[0122] Since the two protrusions D in each pair of protrusions are flush, at the location where the slit St has a pair of protrusions, the maximum dimension t1 of the slit St in the first direction can be larger, and the ink can be relatively flat over a larger area. In this way, the thickness uniformity of the light-emitting functional pattern in each sub-pixel can be improved, and further the light-emitting uniformity of the light-emitting device can be improved.

[0123] Continue to refer to Figure 6 , in some embodiments, the dimension of an opening H (for example, an opening H located in the middle of the slit St) in a slit St (for example, each slit St) of the display panel 10 is larger in the middle and smaller at both sides in the first direction (for example, parallel to the X-axis direction). In other words, at each location of the opening H along the second direction (for example, parallel to the Y-axis direction), the dimension of the opening H in the first direction first increases and then decreases.

[0124] In some possible implementation manners, referring to the above description, in a slit St, two adjacent barrier walls Bk can divide an opening H in the slit St. Based on this, in a slit St, two adjacent barrier walls Bk can be located on both sides of a pair of protrusions in the second direction. In other words, the opening H divided by these two barrier walls Bk has a pair of protrusions. In this way, the dimension of the opening H in the first direction can be larger in the middle and smaller at both sides.

[0125] Since the dimension of an opening H in a slit St of the display panel is larger in the middle and smaller at both sides in the first direction, the shape of the orthographic projection of the opening H on the substrate can be relatively symmetric. In the inkjet printing process, the film-forming uniformity of the ink in the opening can be better, and the light-emitting uniformity of the light-emitting device can be improved.

[0126] Figure 13 is a top view of a display panel according to some embodiments. It should be noted that compared with the Figure 3 display panel, Figure 13 in the display panel, except that the shape of the opening and the position of the barrier wall (which will be specifically described below) are different, the remaining structures can be the same as those in the Figure 3 display panel.

[0127] Refer to Figure 13 , in some other embodiments, the dimension of an opening H (for example, an opening located in the middle of the slit St2) in a slit St (for example, the slit St2) of the display panel 10 is smaller in the middle and larger at both sides in the first direction (for example, parallel to the X-axis direction). In other words, at each location of the opening H along the second direction (for example, parallel to the Y-axis direction), the dimension of the opening H in the first direction first decreases and then increases.

[0128] In some possible implementation manners, referring to the above description, in a slit St, two adjacent barrier walls Bk can delimit an opening H in the slit St. Based on this, in a slit St, each of the two adjacent barrier walls Bk can be located at a pair of protruding portions, and extend from one protruding portion D of the pair of protruding portions to the other protruding portion D. In this way, it is possible to achieve that the size of the opening H delimited by the two barrier walls Bk is smaller in the middle and larger at both sides in the first direction.

[0129] Since the size of an opening H in a slit St of the display panel is smaller in the middle and larger at both sides in the first direction, therefore, the shape of the orthographic projection of the opening H on the substrate can be relatively symmetric. In the inkjet printing process, the film forming uniformity of the ink in the opening can be better, and the light emitting uniformity of the light emitting device can be improved.

[0130] See Figure 6 , in some embodiments, the maximum size t1 of an opening H in a slit St (such as each slit St) of the display panel 10 (such as an opening located in the middle of the slit St) in the first direction (such as the direction parallel to the X-axis) is equal to the maximum size t2 of the opening H in the second direction (such as the direction parallel to the Y-axis).

[0131] Exemplarily, the maximum size t1 of an opening H in the first direction can be the size of the opening along the first direction at the location where it has the protruding portion D. Referring to the above description, an opening H can have a pair of protruding portions. At this time, the maximum size t1 of the opening H in the first direction can be the size of the opening H along the first direction at the location where it has a pair of protruding portions, for example, the sum of the size of the strip-shaped portion L in the first direction and the size of the pair of protruding portions in the first direction. The maximum size t2 of an opening H in the second direction can be the maximum distance between the two side walls of the opening H in the second direction, for example, the maximum distance between two adjacent barrier walls Bk.

[0132] Since the maximum size t1 of an opening H in a slit St of the display panel 10 in the first direction is equal to the maximum size t2 of the opening H in the second direction, therefore, the maximum size t1 of the opening H in the first direction can be relatively large, such that in the inkjet printing process, the film forming uniformity of the ink in the opening in the first direction can be better. In addition, the shape of the orthographic projection of the opening H on the substrate can also be relatively symmetric. In the inkjet printing process, the film forming uniformity of the ink in the opening can be better, and the brightness uniformity of the light emitting device can be improved.

[0133] Figure 14 For Figure 13 is a partial enlarged view of the display panel in , showing two columns of sub-pixels corresponding to two adjacent slits. Figure 15 For Figure 3A partial enlarged view of the display panel, showing two columns of sub-pixels corresponding to two adjacent slits.

[0134] Referring to Figure 14 , in some embodiments, in the first direction (e.g., parallel to the X-axis direction), a barrier Bk disposed in the first slit St1 is flush with a barrier Bk disposed in the second slit St2. In this way, in the display panel, a plurality of sub-pixels P can be arranged in an array, such that a plurality of sub-pixels P emitting different color lights can be located on the same horizontal line. When a plurality of sub-pixels P emitting different color lights are not on the same horizontal line, the picture displayed on the display panel may show a jagged phenomenon at the edge. Therefore, when a barrier Bk disposed in the first slit St1 is flush with a barrier Bk disposed in the second slit St2 in the first direction, the edge display effect of the display panel can be improved.

[0135] Alternatively, referring to Figure 15 , in some other embodiments, in the first direction, a barrier Bk disposed in the first slit St1 is opposite to an opening H located in the second slit St2. For example, the two edges of a barrier Bk disposed in the first slit St1 along the second direction are retracted compared to the two edges of an opening H located in the second slit St2 along the second direction. Similarly, a barrier Bk disposed in the second slit St2 is opposite to an opening H located in the first slit St1. In this way, in the display panel, a plurality of sub-pixels can be arranged in a staggered array, and each sub-pixel can have a substantially same shape, which can improve the light emission uniformity of each sub-pixel in the display panel.

[0136] Referring to Figure 4 , Figure 5A and Figure 5B , in some embodiments, the surface 152f of the second portion 152 of the pixel defining layer is a hydrophilic surface. The surface 151f of the first portion 151 of the pixel defining layer away from the substrate 110 is a hydrophobic surface.

[0137] It should be noted that when the contact angle of a liquid droplet on a surface is less than 90°, the surface can be considered a hydrophilic surface, such as a contact angle of 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° or 90°. When the contact angle is greater than 90°, the surface can be considered a hydrophobic surface, for example, a contact angle of 90°, 100°, 110°, 120°, 130°, 140° or 150°.

[0138] Referring to Figure 4 , Figure 5A , Figure 5B and Figure 6, when the surface 152f of the second part 152 of the pixel defining layer is a lyophilic surface, in the inkjet printing process, the ink located in a slit St is more likely to communicate, which can improve the film formation uniformity of the ink. Further, referring to the above description, the second part 152 of the pixel defining layer includes a plurality of barrier walls Bk. A barrier wall Bk (for example, each barrier wall Bk) can be configured to separate two adjacent first electrodes 121, so that electrical insulation is achieved between two adjacent first electrodes 121, in order to improve the problem of leakage between two adjacent first electrodes 121. To achieve the above functions, the barrier wall Bk needs to have a certain height. Based on this, since the surface 152f of the second part 152 of the pixel defining layer is a lyophilic surface, therefore, on the premise that the barrier wall Bk has a certain height, it is easier to achieve the communication of the ink in the slit St to improve the film formation uniformity of the ink.

[0139] In addition, referring to Figure 16 , Figure 16 is a process flow chart of manufacturing a display panel by using an inkjet printing process. In the inkjet printing process, when an ink droplet is printed into a slit, the volume of the ink droplet is very large and the slit cannot accommodate so much ink, so the ink droplet will climb to the surface 151f of the first part 151 of the pixel defining layer away from the substrate 110. Based on this, since the surface 151f of the first part 151 of the pixel defining layer away from the substrate 110 is a lyophobic surface, therefore, the ink droplet will form a hemispherical protrusion on the side of the slit away from the substrate 110 and will not overflow into adjacent slits, which can improve the problem of poor sub-pixels corresponding to two adjacent slits.

[0140] Figure 17 is a top view of a display panel according to some embodiments. It should be noted that Figure 17 the number and arrangement of the plurality of auxiliary electrode openings shown are only schematic, and the embodiments of the present disclosure do not limit this. And Figure 17 the number and arrangement of the sub-pixels shown are only schematic, and the embodiments of the present disclosure do not limit this.

[0141] Referring to Figure 17 , in some embodiments, the display panel 10 further includes auxiliary electrodes. The auxiliary electrodes are disposed on the side of the pixel defining layer 150 close to the substrate. Exemplarily, the auxiliary electrodes can be disposed in the circuit layer. Specifically, the auxiliary electrodes can be located in a conductor layer of the circuit layer. The display panel 10 further includes an electrode layer. The electrode layer is disposed on the side of the pixel defining layer 150 away from the substrate. The electrode layer can include second electrodes of a plurality of light-emitting devices. The electrode layer can be the second electrode continuous film layer described above.

[0142] Continuing to refer to Figure 17, the first part 151 of the pixel defining layer 150 also has one or more auxiliary electrode openings 151h. An auxiliary electrode opening 151h is disposed between the first slit St1 and the second slit St2. That is to say, an auxiliary electrode opening 151h (for example, each auxiliary electrode opening 151h) can be disposed between two adjacent slits St.

[0143] Furthermore, the electrode layer can be coupled to the auxiliary electrode through one or more auxiliary electrode openings 151h, so that in the display panel 10, a second electrode (for example, each second electrode) can be coupled to the auxiliary electrode. In this way, the sheet resistance of the second electrode continuous film layer can be reduced, and the display effect of the display panel can be improved.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, comprising: a substrate; a pixel defining layer disposed on the substrate, the pixel defining layer including a first part and a second part, the first part having a plurality of slits disposed along a first direction, the second part including a plurality of barrier walls, a plurality of barrier walls being disposed in one slit, the plurality of barrier walls separating the slit into a plurality of openings distributed along a second direction, the height of the first part being greater than the height of the second part, the first direction intersecting the second direction; the slit including a strip portion extending along the second direction and a plurality of protruding portions communicating with the strip portion, in the first direction, the plurality of protruding portions protruding from the strip portion; an auxiliary electrode disposed on a side of the pixel defining layer close to the substrate; an electrode layer disposed on a side of the pixel defining layer away from the substrate; wherein, two adjacent ones of the plurality of slits are a first slit and a second slit, in the second direction, a part of a protruding portion of the second slit is located between two adjacent protruding portions of the first slit; the first part of the pixel defining layer further has an auxiliary electrode opening, the auxiliary electrode opening being disposed between the first slit and the second slit, and the electrode layer is coupled to the auxiliary electrode through the auxiliary electrode opening.

2. The display panel according to claim 1, characterized in that, a positive projection of a protruding portion of the slit on the substrate is a rectangle.

3. The display panel according to claim 1, characterized in that, in the slit, a positive projection on the substrate of an edge of a side wall of a protruding portion away from the substrate includes: a curve protruding in a direction away from the strip portion.

4. The display panel according to claim 1, characterized in that, in the slit, a maximum dimension of a protruding portion in the second direction is greater than or equal to a dimension of the strip portion in the first direction.

5. The display panel according to claim 1, characterized in that, between the strip portion of the first slit and the strip portion of the second slit, the protruding portions of the first slit and the protruding portions of the second slit are alternately arranged.

6. The display panel according to claim 1, characterized in that, the plurality of protruding portions of the slit form a plurality of pairs of protruding portions, two protruding portions in each pair of protruding portions are respectively located on two sides of the strip portion of the slit along the first direction, and in the first direction, the two protruding portions are flush.

7. The display panel according to claim 1, characterized in that, a dimension of an opening in the first direction is larger in the middle and smaller at both sides; or, a dimension of an opening in the first direction is smaller in the middle and larger at both sides.

8. The display panel according to claim 1, characterized in that, a maximum dimension of an opening in the first direction is equal to a maximum dimension of the opening in the second direction.

9. The display panel according to claim 1, characterized in that, in the first direction, a barrier wall disposed in the first slit is flush with a barrier wall disposed in the second slit; or, In the first direction, a barrier wall disposed in the first slit is aligned with an opening located in the second slit.

10. The display panel according to claim 1, wherein, a surface of the second part of the pixel defining layer is a lyophilic surface, and a surface of the first part of the pixel defining layer away from the substrate is a lyophobic surface.

11. A display device, wherein, it includes the display panel according to any one of claims 1 to 10.

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