Display substrate, preparation method thereof and display device

Abstract

The present disclosure provides a display substrate, comprising: a substrate substrate; a plurality of first pixel defining portions arranged on the substrate substrate; a plurality of second pixel defining portions arranged on a side of the plurality of first pixel defining portions away from the substrate substrate; the plurality of second pixel defining portions are arranged intersecting the plurality of first pixel defining portions; a plurality of third pixel defining portions, a part of the first pixel defining portions are provided with the third pixel defining portions, and the orthographic projections of two adjacent third pixel defining portions on the substrate substrate are separated by at least one orthographic projection of the first pixel defining portion on the substrate substrate; the plurality of third pixel defining portions extend along a first direction and are arranged at intervals in a second direction; wherein the orthographic projection of the first pixel defining portion on the substrate substrate covers the orthographic projection of the third pixel defining portion above the first pixel defining portion on the substrate substrate. The present disclosure also provides a preparation method of the display substrate and a display device.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display substrate, its preparation method, and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) emit light when current flows through them. Holes generated at the anode and electrons at the cathode recombine in the light-emitting layer, releasing light. Different excitation energies result in photons of varying energies, corresponding to different colors of light. OLED displays, using devices as display materials, offer advantages such as self-illumination, wide viewing angles, and high contrast. They are widely used in smart products like mobile phones, televisions, and laptops. Furthermore, their lightweight, thinness, and bend resistance make them a key research focus for many scholars both domestically and internationally. Summary of the Invention

[0003] This disclosure aims to solve at least one of the technical problems existing in the prior art, and proposes a display substrate, a method for preparing the same, and a display device.

[0004] To achieve the above objectives, in a first aspect, embodiments of this disclosure provide a display substrate, comprising:

[0005] Substrate;

[0006] A plurality of first pixel defining portions are disposed on the substrate; the plurality of first pixel defining portions extend along a first direction and are spaced apart in a second direction;

[0007] A plurality of second pixel defining portions are disposed on the side of the plurality of first pixel defining portions facing away from the substrate; the plurality of second pixel defining portions extend along the second direction and are spaced apart in the first direction; the plurality of second pixel defining portions are intersecting with the plurality of first pixel defining portions;

[0008] A plurality of third pixel defining portions are provided, with some of the first pixel defining portions having the third pixel defining portions, and the orthographic projections of two adjacent third pixel defining portions on the substrate are spaced apart by at least one orthographic projection of the first pixel defining portion on the substrate; the plurality of third pixel defining portions extend along a first direction and are spaced apart in a second direction; wherein...

[0009] The orthographic projection of the first pixel defining portion on the substrate covers the orthographic projection of the third pixel defining portion located above the first pixel defining portion on the substrate.

[0010] In some embodiments, the width between the orthographic projection of the first pixel defining portion on the substrate and the orthographic projection of the third pixel defining portion located above the first pixel defining portion on the substrate, located on the same side in the second direction, is greater than or equal to 10 μm.

[0011] In some embodiments, the center lines of the orthographic projection of the first pixel defining portion on the substrate and the orthographic projection of the third pixel defining portion located above the first pixel defining portion on the substrate coincide in the first direction.

[0012] In some embodiments, the orthographic projections of two adjacent third pixel defining portions on the substrate are spaced at least n times the orthographic projections of the first pixel defining portions on the substrate, where n is a positive integer and n is greater than or equal to 14.

[0013] In some embodiments, the display substrate further includes:

[0014] A first electrode layer is disposed on the substrate and includes a plurality of first electrodes; the first pixel defining portion is disposed between two adjacent first electrodes;

[0015] A light-emitting layer is disposed on the side of the first electrode layer away from the substrate and includes a light-emitting material; the light-emitting material of the same color is disposed between two adjacent second pixel defining portions, and the light-emitting material covers the first pixel defining portion between two adjacent second pixel defining portions.

[0016] In some embodiments, the display substrate further includes:

[0017] A second electrode layer is disposed on the side of the plurality of first pixel defining portions, the plurality of second pixel defining portions, and the light-emitting layer that is away from the substrate.

[0018] An encapsulation layer is disposed on the side of the second electrode layer opposite to the substrate.

[0019] Secondly, embodiments of this disclosure also provide a display device, including: a display substrate as described in any of the above embodiments.

[0020] Thirdly, embodiments of this disclosure also provide a method for preparing a display substrate, comprising:

[0021] A plurality of first pixel defining portions are formed on a substrate; wherein the plurality of first pixel defining portions extend along a first direction and are spaced apart in a second direction;

[0022] A plurality of second pixel defining portions are formed on the substrate; wherein the plurality of second pixel defining portions extend along the second direction and are spaced apart in the first direction; the plurality of second pixel defining portions are intersected with the plurality of first pixel defining portions;

[0023] A plurality of third pixel defining portions are formed on a portion of the first pixel defining portion; wherein, the orthographic projections of two adjacent third pixel defining portions on the substrate are spaced apart by at least one orthographic projection of the first pixel defining portion on the substrate; the plurality of third pixel defining portions extend along the first direction and are spaced apart in the second direction; the orthographic projections of the first pixel defining portions on the substrate cover the orthographic projections of the third pixel defining portions located above the first pixel defining portions on the substrate.

[0024] In some embodiments, the method further includes:

[0025] A first electrode layer is formed on the substrate; wherein the first electrode layer includes a plurality of first electrodes; and the first pixel defining portion is disposed between two adjacent first electrodes;

[0026] After forming a plurality of third pixel defining portions on a portion of the first pixel defining portion, the method further includes:

[0027] A light-emitting layer is printed on the side of the first electrode layer away from the substrate; the light-emitting layer includes a light-emitting material; the light-emitting material of the same color is disposed between two adjacent second pixel defining portions, and the light-emitting material covers the first pixel defining portion between the two second pixel defining portions.

[0028] In some embodiments, after printing the light-emitting layer on the side of the first electrode layer opposite to the substrate, the method further includes:

[0029] A second electrode layer is formed on the side of the plurality of first pixel defining portions, the plurality of second pixel defining portions, and the light-emitting layer away from the substrate to obtain a light-emitting device;

[0030] The light-emitting device is packaged. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the embodiments of the present disclosure to explain the disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the structure of a display substrate provided in an embodiment of the present disclosure;

[0033] Figure 2 This is a schematic diagram of another display substrate provided in an embodiment of the present disclosure;

[0034] Figure 3 A flowchart illustrating a method for fabricating a display substrate according to an embodiment of this disclosure;

[0035] Figure 4 A flowchart illustrating another method for fabricating a display substrate according to an embodiment of this disclosure. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of this disclosure, the display substrate, its preparation method, and display device provided in this disclosure will be described in detail below with reference to the accompanying drawings.

[0037] Exemplary embodiments will be described more fully below with reference to the accompanying drawings; however, these exemplary embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of this disclosure.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the said feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded.

[0039] It will be understood that while the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited to these terms. These terms are used only to distinguish one element from another. Therefore, without departing from the teachings of this disclosure, the first element, first component, or first module discussed below may be referred to as a second element, second component, or second module.

[0040] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined herein.

[0041] Figure 1 This is a schematic diagram of the structure of a display substrate provided in an embodiment of this disclosure. Figure 1 As shown, the display substrate includes: a substrate (not shown in the figure), a plurality of first pixel defining portions 1, a plurality of second pixel defining portions 2, and a plurality of third pixel defining portions 3.

[0042] In this embodiment, a plurality of first pixel defining portions 1 are disposed on a substrate, extending along a first direction and spaced apart along a second direction, wherein the first and second directions intersect. Figure 1 In this context, BB' is used as the first direction and AA' is used as the second direction. In some embodiments, the first direction and the second direction can be the row direction and the column direction, respectively.

[0043] A plurality of second pixel defining portions 2 are disposed on the side of a plurality of first pixel defining portions 1 away from the substrate, extend along a second direction, and are spaced apart in a first direction; the second pixel defining portions 2 are intersected with the first pixel defining portions 1.

[0044] For a plurality of third pixel defining portions 3, a portion of the first pixel defining portions 1 are provided with third pixel defining portions 3, and the orthographic projections of two adjacent third pixel defining portions 3 on the substrate are spaced apart by at least one orthographic projection of the first pixel defining portion 1 on the substrate; the plurality of third pixel defining portions extend along a first direction and are spaced apart in a second direction; wherein the orthographic projection of the first pixel defining portion 1 on the substrate covers the orthographic projection of the third pixel defining portion 3 located above the first pixel defining portion 1 on the substrate, that is, in the second direction, the width of the third pixel defining portion 3 is smaller than the width of the first pixel defining portion 1.

[0045] In some embodiments, such as Figure 1 As shown, for the orthographic projection of the first pixel defining portion 1 on the substrate and the orthographic projection of the third pixel defining portion 3 located above the first pixel defining portion 1 on the substrate, the width between the edges on the same side in the second direction (marked as aa' in the figure) is greater than or equal to 10 μm; wherein, a certain width is reserved on both sides of the third pixel defining portion 3, so that the ink film formation is not affected in the reserved area, and the film formation state and film formation uniformity on both sides of the third pixel defining portion 3 can be guaranteed.

[0046] In some embodiments, based on reserving a certain transition area between the edge of the first pixel defining portion 1 and the edge of the third pixel defining portion 3, such as Figure 1As shown, the orthographic projections of the first pixel defining portion 1 onto the substrate and the third pixel defining portion 3 located above the first pixel defining portion 1 onto the substrate coincide in the center line (marked as b in the figure) in the first direction. This center line is parallel to the two side edges of the pixel defining portion in the second direction and passes through the middle position of the pixel defining portion in the second direction. It should be noted that the above-mentioned reserved width of at least 10 μm and the arrangement of the third pixel defining portion 3 at the middle position of the corresponding first pixel defining portion 1 are only one specific optional implementation provided by the embodiments of this disclosure. Other arrangement methods are also applicable to the technical solutions of the embodiments of this disclosure.

[0047] This disclosure provides a display substrate including a plurality of first pixel defining portions and a plurality of second pixel defining portions disposed on a substrate. The plurality of first pixel defining portions extend along a first direction, and the plurality of second pixel defining portions extend along a second direction. The second pixel defining portions are intersected with the first pixel defining portions, corresponding to a line bank structure. Based on this structure, ink interconnection between each sub-pixel can be realized, and the ink volume difference between each sub-pixel is homogenized, resulting in a more uniform film and achieving uniform light emission. Furthermore, the display substrate also includes third pixel defining portions disposed on some of the first pixel defining portions. The plurality of third pixel defining portions extend along the first direction, and the orthographic projection of two adjacent third pixel defining portions on the substrate is spaced apart by at least one orthographic projection of a first pixel defining portion on the substrate. Based on the third pixel defining portions, it can be ensured that film formation on both sides of the third pixel defining portions is not affected. This allows the ink film formation state at the edge sealing position of the connected sub-pixels to be consistent with the film formation state at other positions, avoiding the problem of uneven light emission at the edge sealing position.

[0048] Figure 2 This is a schematic diagram of another display substrate provided in an embodiment of this disclosure. (See attached diagram.) Figure 2 As shown, this structure is based on Figure 1 The structure shown includes a first electrode layer (not shown) and a light-emitting layer 4.

[0049] The first electrode layer is disposed on the substrate and includes a plurality of first electrodes; the first pixel defining part 1 is disposed between two adjacent first electrodes.

[0050] The light-emitting layer 4 is disposed on the side of the first electrode layer away from the substrate and includes a light-emitting material; a light-emitting material of the same color is disposed between two adjacent second pixel defining portions 2, and the light-emitting material covers the first pixel defining portion 1 between the two adjacent second pixel defining portions 2; in the figure, red light-emitting material R, green light-emitting material G, and blue light-emitting material B are used as examples, which correspond to red sub-pixels, green sub-pixels, and blue sub-pixels, respectively; it should be understood that the light-emitting material of this color and Figure 2 The corresponding sub-pixel arrangement is only one specific optional implementation method provided by the embodiments of this disclosure. Other colored light-emitting materials, such as white light-emitting materials, and other pixel arrangement methods are also applicable to the technical solutions of the embodiments of this disclosure.

[0051] Specifically, the light-emitting layer 4 is connected in the second direction. That is to say, when the display substrate is prepared based on inkjet printing, the ink between some sub-pixels in each column of the same color sub-pixels is interconnected. If each sub-pixel arranged side by side and connected in the second direction is a pixel group of the same color, then the pixel group is located between two adjacent second pixel limiting parts 2, covering the first pixel limiting part 1 between the two adjacent second pixel limiting parts 2, and the third pixel limiting part 3 separates the pixel groups on the same column.

[0052] It is important to understand that, in order to clearly demonstrate the relative positional relationships of the various layers of the display substrate, in Figure 2 The portion of the light-emitting layer 4 covering the first pixel limiting part 1 is represented by an area with a certain degree of transparency, which is the connecting part between the two sub-pixels.

[0053] In some embodiments, the first pixel defining portion 1 and the second pixel defining portion 2 are both organic materials, wherein the second pixel defining portion 2 is a hydrophobic material and the first pixel defining portion 1 is a hydrophilic material.

[0054] In some embodiments, the thickness of the first pixel defining portion 1 is less than the thickness of the second pixel defining portion 2; specifically, the first pixel defining portion 1 covers the edge of each first electrode to prevent leakage, and the first pixel defining portion 1 can define a light-emitting area; based on the smaller thickness of the first pixel defining portion 1, the above-described embodiment of interconnection between each column of sub-pixels of the same color can be realized.

[0055] Specifically, the number of connected sub-pixels is related to the film formation state, which refers to the ink film formation state of the sub-pixels. This can be reflected from the perspective of film formation uniformity. Since sub-pixels of the same color are interconnected within each column, the ink volume difference between sub-pixels can be homogenized, avoiding uneven film thickness between sub-pixels and thus obtaining a more uniform film. If each connected sub-pixel in the same column is considered a pixel group of the same color, when the number of connected sub-pixels, i.e., the number of sub-pixels within a pixel group, reaches a certain value—specifically, when the number of sub-pixels within a pixel group reaches 15—further increasing the number of sub-pixels within the pixel group will not significantly change the film formation uniformity of each sub-pixel. Corresponding to the above theory, in some embodiments, the orthographic projections of two adjacent third pixel defining portions 3 onto the substrate are spaced at least n times the orthographic projections of the first pixel defining portions 1 onto the substrate, where n is a positive integer and greater than or equal to 14. That is, there is a gap of at least 15 sub-pixels of the same color located in the same column between two adjacent third pixel defining portions 3.

[0056] In some embodiments, the display substrate further includes: a second electrode layer disposed on the side opposite to the substrate of the plurality of first pixel defining portions 1, the plurality of second pixel defining portions 2 and the light-emitting layer 4; and an encapsulation layer disposed on the side opposite to the substrate of the second electrode layer. The first electrode layer, the light-emitting layer and the second electrode layer constitute a light-emitting device. In some embodiments, the first electrode layer and the first electrode may be referred to as the anode and the second electrode layer may be referred to as the cathode. In some embodiments, the light-emitting device is an OLED device, and other organic functional layers, such as a hole injection layer, a hole transport layer, an electron injection layer and an electron transport layer, are also included between the first electrode layer and the second electrode layer in addition to the light-emitting layer.

[0057] This disclosure also provides a display device, including a display substrate as described in any of the above embodiments.

[0058] Figure 3 This is a flowchart illustrating a method for fabricating a display substrate according to an embodiment of this disclosure. Figure 3 As shown, the method includes:

[0059] Step S1: Form a plurality of first pixel defining portions on the substrate.

[0060] The plurality of first pixel defining portions extend along a first direction and are spaced apart in a second direction.

[0061] Step S2: Form a plurality of second pixel defining portions on the substrate.

[0062] The plurality of second pixel defining portions extend along a second direction and are spaced apart in a first direction; the plurality of second pixel defining portions are intersected with the plurality of first pixel defining portions.

[0063] Step S3: Form a plurality of third pixel limiting portions on a portion of the first pixel limiting portion.

[0064] Wherein, the orthographic projections of two adjacent third pixel defining portions on the substrate are spaced apart by at least one orthographic projection of a first pixel defining portion on the substrate; a plurality of third pixel defining portions extend along a first direction and are spaced apart in a second direction; the orthographic projection of the first pixel defining portion on the substrate covers the orthographic projection of the third pixel defining portion located above the first pixel defining portion on the substrate.

[0065] In some embodiments, the orthographic projections of two adjacent third pixel defining portions 3 on the substrate are spaced apart by at least n orthographic projections of the first pixel defining portions 1 on the substrate, where n is a positive integer and n is greater than or equal to 14.

[0066] In some embodiments, the width between the edges of the first pixel defining portion on the substrate and the third pixel defining portion located above the first pixel defining portion on the substrate is greater than or equal to 10 μm.

[0067] In some embodiments, the center lines of the first pixel definition portion on the substrate and the third pixel definition portion located above the first pixel definition portion on the substrate coincide in the first direction.

[0068] Figure 4 A flowchart illustrating another method for fabricating a display substrate according to an embodiment of this disclosure. Specifically, this method is based on... Figure 3 One specific alternative implementation of the method shown; such as Figure 4 As shown, the method includes not only steps S1 to S3, but also step S01, and step S4 after step S3. Only steps S01 and S4 will be described in detail below.

[0069] Step S01: Form a first electrode layer on the substrate.

[0070] The first electrode layer includes a plurality of first electrodes; the first pixel defining portion is disposed between two adjacent first electrodes.

[0071] It should be noted that the execution order of steps S01 and steps S1 to S3 is not limited in the embodiments of this disclosure. That is, step S01 may be executed before steps S1 to S3, or after steps S1 to S3, or step S01 may be executed intermittently with steps S1 to S3. All of these are applicable to the technical solutions of the embodiments of this disclosure.

[0072] After step S3, which involves forming a plurality of third pixel defining portions on a portion of the first pixel defining portion, the method further includes:

[0073] Step S4: Print the light-emitting layer on the side of the first electrode layer away from the substrate.

[0074] The light-emitting layer includes a light-emitting material; a light-emitting material of the same color is disposed between two adjacent second pixel defining portions, and the light-emitting material covers the first pixel defining portion between the two second pixel defining portions.

[0075] In some embodiments, when printing the light-emitting layer on the side of the first electrode layer away from the substrate, the printing of a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer is also performed.

[0076] In some embodiments, such as Figure 4 As shown, after step S4, which involves printing the light-emitting layer on the side of the first electrode layer away from the substrate, the method further includes steps S5 and S6.

[0077] Step S5: A second electrode layer is formed on the side of the plurality of first pixel defining portions, the plurality of second pixel defining portions and the light-emitting layer away from the substrate, thereby obtaining a light-emitting device.

[0078] Step S6: Package the light-emitting device.

[0079] In this process, a second electrode layer is formed based on the above steps S1 to S4 to obtain a light-emitting device, and the vapor deposition and encapsulation process is completed.

[0080] It will be understood by those skilled in the art that all or some of the steps in the methods disclosed above, and the functional modules / units in the apparatus, can be implemented as software, firmware, hardware, and suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0081] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in connection with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. A display substrate, wherein, include: Substrate; A plurality of first pixel defining portions are disposed on the substrate; The plurality of first pixel defining portions extend along a first direction and are spaced apart in a second direction; A plurality of second pixel defining portions are disposed on the side of the plurality of first pixel defining portions facing away from the substrate; the plurality of second pixel defining portions extend along the second direction and are spaced apart in the first direction; the plurality of second pixel defining portions are intersecting with the plurality of first pixel defining portions; A plurality of third pixel defining portions are provided on some of the first pixel defining portions, and the orthographic projection of two adjacent third pixel defining portions on the substrate is separated by at least one orthographic projection of the first pixel defining portion on the substrate; the plurality of third pixel defining portions extend along the first direction and are spaced apart in the second direction; A first electrode layer is disposed on the substrate and includes a plurality of first electrodes; the first pixel defining portion is disposed between two adjacent first electrodes; A light-emitting layer is disposed on the side of the first electrode layer opposite to the substrate, the light-emitting layer is interconnected in the second direction, and is partially separated by the third pixel; wherein, The orthographic projection of the first pixel defining portion on the substrate covers the orthographic projection of the third pixel defining portion located above the first pixel defining portion on the substrate, and in the second direction, the width of the third pixel defining portion is smaller than the width of the first pixel defining portion; The width between the orthographic projection of the first pixel defining portion on the substrate and the orthographic projection of the third pixel defining portion located above the first pixel defining portion on the substrate is greater than or equal to 10 μm on the same side in the second direction. The orthographic projections of two adjacent third pixel defining portions on the substrate are spaced at least n times the orthographic projections of the first pixel defining portions on the substrate, where n is a positive integer and n is greater than or equal to 14.

2. The display substrate according to claim 1, wherein, The center lines of the first pixel defining portion and the third pixel defining portion located above the first pixel defining portion on the substrate coincide in the first direction.

3. The display substrate according to claim 1, wherein, The light-emitting layer includes a light-emitting material; the light-emitting material of the same color is disposed between two adjacent second pixel defining portions, and the light-emitting material covers the first pixel defining portion between two adjacent second pixel defining portions.

4. The display substrate according to claim 3, wherein, Also includes: A second electrode layer is disposed on the side of the plurality of first pixel defining portions, the plurality of second pixel defining portions, and the light-emitting layer that is away from the substrate. An encapsulation layer is disposed on the side of the second electrode layer opposite to the substrate.

5. A display device, wherein, include: The display substrate as described in any one of claims 1-4.

6. A method for preparing a display substrate, wherein, include: A plurality of first pixel defining portions are formed on a substrate; wherein the plurality of first pixel defining portions extend along a first direction and are spaced apart in a second direction; A first electrode layer is formed on the substrate; wherein the first electrode layer includes a plurality of first electrodes; and the first pixel defining portion is disposed between two adjacent first electrodes; A plurality of second pixel defining portions are formed on the substrate; wherein the plurality of second pixel defining portions extend along the second direction and are spaced apart in the first direction; the plurality of second pixel defining portions are intersected with the plurality of first pixel defining portions; A plurality of third pixel defining portions are formed on a portion of the first pixel defining portion; wherein, the orthographic projections of two adjacent third pixel defining portions on the substrate are spaced apart by at least one orthographic projection of the first pixel defining portion on the substrate; the plurality of third pixel defining portions extend along the first direction and are spaced apart in the second direction; the orthographic projections of the first pixel defining portions on the substrate cover the orthographic projections of the third pixel defining portions located above the first pixel defining portions on the substrate; and in the second direction, the width of the third pixel defining portion is smaller than the width of the first pixel defining portion. A light-emitting layer is printed on the side of the first electrode layer away from the substrate, the light-emitting layer being connected in the second direction and partially separated by the third pixel; The width between the orthographic projection of the first pixel defining portion on the substrate and the orthographic projection of the third pixel defining portion located above the first pixel defining portion on the substrate is greater than or equal to 10 μm on the same side in the second direction. The orthographic projections of two adjacent third pixel defining portions on the substrate are spaced at least n times the orthographic projections of the first pixel defining portions on the substrate, where n is a positive integer and n is greater than or equal to 14.

7. The preparation method according to claim 6, wherein, The light-emitting layer includes a light-emitting material; the light-emitting material of the same color is disposed between two adjacent second pixel defining portions, and the light-emitting material covers the first pixel defining portion between the two second pixel defining portions.

8. The preparation method according to claim 7, wherein, After printing the light-emitting layer on the side of the first electrode layer away from the substrate, the method further includes: A second electrode layer is formed on the side of the plurality of first pixel defining portions, the plurality of second pixel defining portions, and the light-emitting layer away from the substrate to obtain a light-emitting device; The light-emitting device is packaged.

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