Display substrate and display device

Abstract

A display substrate comprises a light-emitting structure layer disposed on a substrate, the light-emitting structure layer comprising a first electrode layer, a pixel defining layer, a light-emitting functional layer, and a second electrode layer; the first electrode layer comprises a plurality of first electrodes; the pixel defining layer is disposed on a side of the plurality of first electrodes away from the substrate, and is provided with a plurality of pixel openings and a plurality of flow channels; the pixel opening exposes the surface of the first electrode away from the substrate, and the flow channel is located between two pixel openings adjacent in a first direction and connects the two pixel openings adjacent in the first direction; the light-emitting functional layer comprises a first functional layer and a light-emitting layer stacked; the first functional layer is disposed on the surface of the plurality of first electrodes away from the substrate, and at least one film layer of the first functional layer is located in the plurality of pixel openings and the plurality of flow channels; the light-emitting layer is disposed on the surface of the first functional layer away from the substrate and located in the pixel opening; and the second electrode layer is disposed on the surface of the light-emitting functional layer away from the substrate.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to, but are not limited to, the technical field of display, and in particular, to a display substrate and a display device. BACKGROUND

[0002] At present, organic light emitting diode (OLED) display products are gradually replacing liquid crystal display (LCD) products due to wide color gamut, low power consumption, fast response speed and other advantages. In most OLED display products on the market, the organic film layer of the OLED device is made by evaporation technology. However, this technology has the disadvantages of low material utilization rate and high production cost. Therefore, many enterprises and research institutions have focused on the development of inkjet printing OLED technology.

[0003] Inkjet printing is a solution method that prepares OLED materials into ink, sprays them into the pixel opening of the designated sub-pixel through the nozzle, and then dries them into a film. Compared with evaporation technology, inkjet printing technology not only reduces material waste, but also reduces the use of mask (MASK) and the cost of maintaining high-vacuum environment. However, in the actual printing process, due to the precision of the nozzle and the ink material, the ink droplets will deviate and be mistakenly dropped into the adjacent sub-pixel, resulting in differences in ink volume inside different sub-pixels, and uneven film thickness after drying into a film. For example, when preparing a hole injection layer (HIL), the phenomenon of ink droplet deviation is more obvious due to the ink, which will cause obvious bright and dark lines in the final display device, affecting the performance of the display device. SUMMARY

[0004] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0005] Embodiments of the present disclosure provide a display substrate, comprising a display area and a non-display area located at the periphery of the display area;

[0006] The display area comprises a driving structure layer and a light emitting structure layer which are sequentially stacked on a substrate, the light emitting structure layer comprises a first electrode layer, a pixel defining layer, a light emitting functional layer and a second electrode layer; the first electrode layer comprises a plurality of first electrodes arranged on the side of the driving structure layer away from the substrate;

[0007] The pixel defining layer is arranged on the side of the plurality of first electrodes away from the substrate, and is provided with a plurality of pixel openings and a plurality of flow channels; the pixel opening exposes the surface of the first electrode away from the substrate, and the flow channel is located between two adjacent pixel openings in the first direction and connects the two adjacent pixel openings in the first direction;

[0008] The light-emitting functional layer comprises a first functional layer and a light-emitting layer which are sequentially stacked in a direction away from the substrate; the first functional layer is arranged on the surface of the plurality of first electrodes away from the substrate, the first functional layer comprises one or more film layers, and at least one film layer of the first functional layer is located in the plurality of pixel openings and the plurality of flow channels; the light-emitting layer is arranged on the surface of the first functional layer away from the substrate and located in the pixel openings.

[0009] The second electrode layer is arranged on the surface of the light-emitting functional layer away from the substrate, and the first electrode, the light-emitting functional layer and the second electrode layer are sequentially stacked to form a light-emitting device.

[0010] The display substrate can be used in a display device.

[0011] Other aspects can be apparent after reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the technical solutions of the present disclosure, and constitute a part of the specification, and are used to explain the technical solutions of the present disclosure together with the embodiments of the present disclosure, and do not constitute a limitation on the technical solutions of the present disclosure. The shapes and sizes of the components in the drawings do not reflect the true proportions, and the purpose is only to schematically illustrate the present disclosure.

[0013] Figure 1 A pixel arrangement structure schematic diagram of a display substrate of some exemplary embodiments;

[0014] Figure 2 A A-A cross-sectional structure schematic diagram in some exemplary embodiments; Figure 1

[0015] Figure 3 A plane structure schematic diagram after forming the first electrode and the first sub-layer of the first pixel defining layer on the driving backplate in some exemplary embodiments;

[0016] Figure 4a A plane structure schematic diagram after forming the second sub-layer of the first pixel defining layer in some exemplary embodiments;

[0017] Figure 4b A B-B cross-sectional structure schematic diagram in some exemplary embodiments; Figure 4a

[0018] Figure 4c A C-C cross-sectional structure schematic diagram in some exemplary embodiments; Figure 4a

[0019] Figure 5a A plane structure schematic diagram after forming the second pixel defining layer in some exemplary embodiments; ​​​

[0020] Figure 5b for Figure 5a DD cross-sectional structure diagram in;

[0021] Figure 5c for Figure 5a Schematic diagram of EE cross-section structure in;

[0022] Figure 6 is a schematic diagram of a planar structure after forming the third sublayer of the second pixel defining layer in some exemplary embodiments;

[0023] Figure 7 is a schematic diagram of a planar structure after forming the fourth sublayer of the second pixel defining layer in some exemplary embodiments;

[0024] Figure 8 Schematic diagram of a planar structure after forming a first electrode and a first sub-layer of a first pixel defining layer on a driving backplane in some other exemplary embodiments;

[0025] Figure 9a is a schematic diagram of a planar structure after forming the second sublayer of the first pixel defining layer in some other exemplary embodiments;

[0026] Figure 9b for Figure 9a Schematic diagram of HH cross-section structure;

[0027] Figure 9c for Figure 9a Schematic diagram of the II cross-section structure;

[0028] Figure 9d for Figure 9a Schematic diagram of the JJ cross-section structure;

[0029] Figure 10a is a schematic diagram of a planar structure after forming a second pixel defining layer in some other exemplary embodiments;

[0030] Figure 10b for Figure 10a Schematic diagram of the MM cross-section structure.

[0031] Figure 11a is a schematic diagram of a planar structure after forming a second pixel defining layer in some further exemplary embodiments;

[0032] Figure 11b for Figure 11a KK cross-sectional structure diagram in;

[0033] Figure 11c for Figure 11a Schematic diagram of the LL cross-section structure. DETAILED DESCRIPTION

[0034] It should be understood by those of ordinary skill in the art that the technical solutions of the embodiments of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and all should be covered in the scope of the claims of the present disclosure.

[0035] As Figure 1 shown, Figure 1 A schematic diagram of a pixel arrangement structure of a display substrate for some example embodiments, the display substrate comprising a display area 100 and a non-display area 200 located at the periphery of the display area 100, the display area 100 comprising a plurality of pixel units P arranged in an array on a substrate 10, each pixel unit P comprising a plurality of sub-pixels arranged in sequence along a first direction X (which can be referred to as a column direction), a plurality of sub-pixels in the same row in a second direction Y (which can be referred to as a row direction) can emit light of the same color, and the first direction X intersects the second direction Y. For example, each pixel unit P can comprise three sub-pixels arranged side by side along the first direction X, namely a first sub-pixel P1 emitting first color light (such as red light), a second sub-pixel P2 emitting second color light (such as green light), and a third sub-pixel P3 emitting third color light (such as blue light). A plurality of pixel units P are arranged in sequence along the first direction X, and a plurality of sub-pixels in the same row in the second direction Y can emit light of the same color. For example, the first direction X and the second direction Y can be perpendicular to each other. Figure 1 Each sub-pixel in the figure represents the area of each sub-pixel, which is the light-emitting area or the pixel opening area. The embodiments of the present disclosure do not limit the pixel arrangement manner of the display substrate, nor the type and number of sub-pixels included in each pixel unit.

[0036] The embodiments of the present disclosure provide a display substrate, in some example embodiments, as Figure 2 shown, Figure 2 A schematic diagram of a cross-sectional structure of A-A in some example embodiments Figure 1 The display substrate comprises a display area 100 and a non-display area 200 located at the periphery of the display area 100; the display area 100 comprises a driving structure layer and a light-emitting structure layer arranged in sequence on a substrate, the light-emitting structure layer comprising a first electrode layer, a pixel defining layer 122, a light-emitting functional layer, and a second electrode layer 124; wherein the substrate and the driving structure layer arranged on the substrate can be collectively referred to as a driving backplane 110;

[0037] The first electrode layer comprises a plurality of first electrodes 121 arranged on the side of the driving structure layer away from the substrate;

[0038] The pixel defining layer 122 is arranged on the side of the plurality of first electrodes 121 away from the substrate, and is provided with a plurality of pixel openings 1221 and a plurality of flow channels 1222; the pixel opening 1221 exposes the surface of the first electrode 121 away from the substrate, and the flow channel 1222 is located between two adjacent pixel openings 1221 in the first direction X and connects the two adjacent pixel openings 1221 in the first direction X.

[0039] The light-emitting functional layer includes a first functional layer 31 and a light-emitting layer 32 arranged in sequence away from the substrate; the first functional layer 31 is arranged on the surface of the plurality of first electrodes 121 away from the substrate, the first functional layer 31 includes one or more film layers, and at least one film layer of the first functional layer 31 is located in the plurality of pixel openings 1221 and the plurality of flow channels 1222; the light-emitting layer 32 is arranged on the surface of the first functional layer 31 away from the substrate and is located in the pixel opening 1221;

[0040] The second electrode layer 124 is arranged on the surface of the light-emitting functional layer away from the substrate, and the first electrode 121, the light-emitting functional layer and the second electrode layer 124 are arranged in sequence and form a light-emitting device.

[0041] The display substrate of the embodiment of the present disclosure, the pixel defining layer 122 is provided with a plurality of flow channels 1222, and the flow channel 1222 is located between two adjacent pixel openings 1221 in the first direction X and connects the two adjacent pixel openings 1221 in the first direction X, so that when the one or more film layers of the first functional layer 31 are formed by using the inkjet printing process, the ink of the first functional layer 31 can flow between the plurality of pixel openings 1221 in the first direction X through the plurality of flow channels 1222, so that the ink volume of the first functional layer 31 in the plurality of pixel openings 1221 in the first direction X is smaller, and after the ink of the first functional layer 31 is dried into a film, the thickness of the film layer of the first functional layer 31 formed in different pixel openings 1221 is more uniform, thereby the difference in ink volume of the first functional layer 31 in different pixel openings 1221 caused by the deviation of ink droplets of the first functional layer 31 in the first direction X can be reduced, and the thickness difference of the film layer of the first functional layer 31 formed in different pixel openings 1221 can be reduced, the display effect is improved, and in addition, it is beneficial to design the pixel opening 1221 to be smaller, and to realize the preparation of a high-resolution display substrate.

[0042] The display substrate of the embodiments of the present disclosure, at least one film layer of the first functional layer 31 is located within the plurality of pixel openings 1221 and within the plurality of flow channels 1222, so that in some embodiments, the first functional layer 31 can block the plurality of flow channels 1222, for example, the first functional layer 31 can fill in the plurality of flow channels 1222, so that when the light-emitting layer 32 is formed by using the inkjet printing process subsequently, the ink of the light-emitting layer 32 can be prevented from flowing between the plurality of pixel openings 1221 in the first direction X through the plurality of flow channels 1222, and in some exemplary embodiments, cross-color between different sub-pixels in the first direction X can be avoided.

[0043] In some exemplary embodiments, the substrate can be a transparent rigid substrate or a flexible substrate, for example, the material of the substrate can be glass, quartz, plastic or transparent metal, etc.

[0044] The driving structure layer can include a plurality of pixel driving circuits. The pixel driving circuit can include a plurality of thin film transistors (T) and a storage capacitor (C), and the pixel driving circuit can be of a 3T1C, 4T1C, 5T1C, 5T2C, 6T1C or 7T1C structure, and the embodiments of the present disclosure are not limited thereto. The driving structure layer further includes a plurality of data lines and a plurality of gate lines, as well as other signal lines. The first electrode 121 is connected to the pixel driving circuit, and the pixel driving circuit drives a corresponding one of the light-emitting devices to emit light. The light-emitting device can be a bottom-emission type or a top-emission type OLED device. The first electrode 121 can be an anode of the light-emitting device. When the light-emitting device is a bottom-emission type OLED device, the anode is a transparent anode. When the light-emitting device is a top-emission type OLED device, the anode is a reflective anode. The second electrode layer 124 can be a cathode of the light-emitting device.

[0045] In some exemplary embodiments, as shown in Figure 2 At least one film layer of the first functional layer 31 includes a plurality of first extensions extending along the first direction X, and the first extensions are of an integral structure and are located within the plurality of pixel openings 1221 and within the plurality of flow channels 1222 in the first direction X.

[0046] In some exemplary embodiments, the pixel defining layer can be a single-layer structure, or the pixel defining layer can be a multi-layer structure.

[0047] In some exemplary embodiments, as shown in Figure 2As shown, the pixel defining layer 122 can include a first pixel defining layer 21 and a second pixel defining layer 22; the first pixel defining layer 21 is disposed on the side of the plurality of first electrodes 121 away from the substrate and is provided with a plurality of first pixel openings 211 and a plurality of flow channels 1222, the first pixel openings 211 expose the surface of the first electrodes 121 away from the substrate, and the flow channels 1222 are located between two adjacent first pixel openings 211 in the first direction X; the second pixel defining layer 22 is disposed on the side of the first pixel defining layer 21 away from the substrate and is provided with a plurality of second pixel openings 221, the second pixel openings 221 are positionally corresponding to the first pixel openings 211 and jointly form the pixel openings 1221, and the plurality of second pixel openings 221 expose two ports of the plurality of flow channels 1222.

[0048] In one example of the embodiment, as shown in Figure 3 、 Figure 4a 、 Figure 4b and Figure 4c , Figure 3 is a schematic diagram of the planar structure after forming the first electrode and the first sub-layer of the pixel defining layer on the driving backplane in some example embodiments, Figure 4a is a schematic diagram of the planar structure after forming the second sub-layer of the pixel defining layer in some example embodiments, Figure 4b is a schematic diagram of the B-B cross-sectional structure in Figure 4a , Figure 4c is a schematic diagram of the C-C cross-sectional structure in Figure 4a , the first pixel defining layer 21 includes a first sub-layer 41 and a second sub-layer 42; the first sub-layer 41 is disposed on the side of the plurality of first electrodes 121 away from the substrate and is provided with the plurality of first pixel openings 211; the second sub-layer 42 is disposed on the surface of the first sub-layer 41 away from the substrate, and the second sub-layer 42 includes a plurality of communication parts 421, the communication parts 421 are provided with the flow channels 1222 and are located between two adjacent first pixel openings 211 in the first direction X.

[0049] The second pixel defining layer 22 can be a single-layer structure. As shown in Figure 5a 、 Figure 5b and Figure 5c , Figure 5a is a schematic diagram of the planar structure after forming the second pixel defining layer in some example embodiments, Figure 5b is a schematic diagram of the D-D cross-sectional structure in Figure 5a , Figure 5c is a schematic diagram of the E-E cross-sectional structure in Figure 5aThe second pixel defining layer 22 is disposed on the first sub-layer 41 and the plurality of communication portions 421 away from the substrate, and is provided with a plurality of second pixel openings 221 corresponding to the first pixel openings 211 and jointly forming the pixel openings 1221. The plurality of second pixel openings 221 expose two ports of the plurality of flow channels 1222, so that the flow channels 1222 are located between two adjacent pixel openings 1221 in the first direction X and communicate the two adjacent pixel openings 1221 in the first direction X.

[0050] In some embodiments of the present example, after the first pixel defining layer 21 and the second pixel defining layer 22 are formed, a plurality of film layers of the first functional layer 31 can be formed by an inkjet printing process. For example, as shown in FIG. 6, the first functional layer 31 can include a hole injection layer 311 and a hole transport layer 312 disposed in sequence away from the substrate. The hole injection layer 311 and the hole transport layer 312 can be formed by an inkjet printing process. The hole injection layer 311 and the hole transport layer 312 can be located in the plurality of pixel openings 1221 and the plurality of flow channels 1222. The hole injection layer 311 and the hole transport layer 312 can block the plurality of flow channels 1222, such as being filled in the plurality of flow channels 1222. Figure 2 The surface of the hole transport layer 312 away from the substrate (i.e., the surface of the first functional layer 31 away from the substrate) located in the pixel opening 1221 can be higher than the surface of the flow channel 1222 facing the substrate. The surface of the hole transport layer 312 away from the substrate can be lower or higher than the surface of the communication portion 421 away from the substrate, and lower than the surface of the second pixel defining layer 22 away from the substrate. For example, as shown in FIG. 6, the surface of the hole transport layer 312 away from the substrate can be higher than the surface of the communication portion 421 away from the substrate, and lower than the surface of the second pixel defining layer 22 away from the substrate. Figure 2As shown, the hole injection layer 311 and the hole transport layer 312 may each include a plurality of first extensions extending along the first direction X. The first extensions are integrally structured and located within the plurality of pixel openings 1221 and the plurality of flow channels 1222 in the first direction X. That is, the hole injection layers 311 of the plurality of sub-pixels in the same column in the first direction X may be connected as a whole, and the hole transport layers 312 of the plurality of sub-pixels in the same column in the first direction X may be connected as a whole. In other embodiments, after the ink of the hole injection layer and / or the hole transport layer is dried to form a film, the formed hole injection layer and / or the hole transport layer may be disconnected between the pixel opening and the flow channel in the first direction X. That is, the hole injection layers of the plurality of sub-pixels in the same column in the first direction X may be disconnected, and the hole transport layers of the plurality of sub-pixels in the same column in the first direction X may be disconnected. In other embodiments, the first functional layer 31 may include only one film layer, or the first functional layer 31 may include more than two film layers.

[0051] For example, Figure 2 As shown, the light emitting layer 32 may be provided on the surface of the hole transport layer 312 away from the substrate and located within the pixel opening 1221. The light emitting layer 32 may be formed by inkjet printing or evaporation.

[0052] In some implementations of this example, Figure 4a and Figure 5a As shown, the pixel defining layers (the first pixel defining layer 21 and the second pixel defining layer 22) may extend to the non-display area 200, and the peripheral edges of the pixel defining layers are located within the non-display area 200. The orthographic projection of the first sublayer 41 on the substrate may include the orthographic projections of the plurality of connecting portions 421 on the substrate. The peripheral edges of the first sublayer 41 and the second pixel defining layer 22 may both be located within the non-display area 200, and the shapes of the peripheral edges of the first sublayer 41 and the second pixel defining layer 22 may both be rectangular.

[0053] In some embodiments of this example, the multiple pixel openings are arranged into multiple rows and columns, the multiple pixel openings arranged along the first direction X are a column of pixel openings, and the multiple pixel openings arranged along the second direction Y are a row of pixel openings, the first direction X intersects with the second direction Y; and the distance between two adjacent pixel openings in the first direction X is smaller than the distance between two adjacent pixel openings in the second direction Y.

[0054] For example, Figure 4a andFigure 5a As shown, Figure 5a The second pixel opening 221 of the second pixel defining layer 22 in the second pixel defines a second pixel opening 221 of the second pixel defining layer 22 in the second pixel. Figure 4a The first pixel opening 211 of the first pixel defining layer 21 in the first pixel corresponds in position to and jointly forms the pixel opening 1221, so in this example, the arrangement of the plurality of first pixel openings 211 of the first pixel defining layer 21 is the arrangement of the plurality of pixel openings.

[0055] As shown, Figure 4a The plurality of first pixel openings 211 are arranged in multiple rows and multiple columns, the plurality of first pixel openings 211 arranged along the first direction X form a column of first pixel openings, the plurality of first pixel openings 211 arranged along the second direction Y form a row of first pixel openings, and the first direction X intersects the second direction Y; the distance d1 between two adjacent first pixel openings 211 in the first direction X is less than the distance d2 between two adjacent first pixel openings 211 in the second direction Y. That is, the distance between two adjacent pixel openings in the first direction X is less than the distance between two adjacent pixel openings in the second direction Y.

[0056] Because the distance between two adjacent pixel openings in the first direction X is less than the distance between two adjacent pixel openings in the second direction Y, that is, the distance between two adjacent pixel openings in the first direction X is smaller, in some technologies, when forming a film layer (such as a hole injection layer) of a first functional layer using an inkjet printing process, the accuracy of the nozzle and the ink material are limited, and the ink droplets will be angularly offset, easily incorrectly dropped into the pixel openings adjacent in the first direction X, resulting in differences in ink volume inside different sub-pixels, and after drying into a film, the problem of uneven film thickness occurs, affecting the display effect. In the embodiments of the present disclosure, as shown, Figure 2As shown, the pixel defining layer 122 is provided with a plurality of flow channels 1222, and the flow channels 1222 are located between two pixel openings 1221 adjacent in the first direction X and communicate the two pixel openings 1221 adjacent in the first direction X. Thus, when one or more film layers of the first functional layer 31 are formed by using the inkjet printing process, the ink of the first functional layer 31 can flow through the plurality of flow channels 1222 between the pixel openings in the first direction X, so that the volume difference of the ink of the first functional layer 31 in the pixel openings 1221 in the first direction X is small, and after the ink of the first functional layer 31 is dried into a film, the thickness of the film layer of the first functional layer 31 formed in different pixel openings 1221 is relatively uniform, thereby reducing the volume difference of the ink of the first functional layer 31 in different pixel openings 1221 due to the deflection of ink droplets of the first functional layer 31 in the first direction X, and further reducing the thickness difference of the film layer of the first functional layer 31 formed in different pixel openings 1221, and improving the display effect.

[0057] In some embodiments of the present example, as shown in Figure 2 As shown, the light-emitting functional layer can further include a second functional layer 33 disposed between the light-emitting layer 32 and the second electrode layer 124. The second functional layer 33 can include an electron transport layer 331 and an electron injection layer 332 stacked in sequence away from the substrate. The electron transport layer 331 and the electron injection layer 332 can be formed by an evaporation process. As shown in Figure 2 As shown, the display substrate can further include an encapsulation structure layer 13 disposed away from the substrate side of the second electrode layer 124. The encapsulation structure layer 13 can be a thin film encapsulation layer. The encapsulation structure layer 13 can include a first inorganic material layer, an organic material layer, and a second inorganic material layer stacked in sequence away from the substrate. The materials of the first inorganic material layer and the second inorganic material layer can include any one or more of silicon nitride, silicon oxide, and silicon oxynitride. The material of the organic material layer can include resin.

[0058] In another example of the present embodiment, as shown in Figure 3 、 Figure 4a 、 Figure 4b and Figure 4c As shown in Figure 3 is a schematic planar structure diagram after forming the first electrode 121 and the first sub-layer 41 of the first pixel defining layer on the driving backplate 110 in some exemplary embodiments, Figure 4a is a schematic planar structure diagram after forming the second sub-layer 42 of the first pixel defining layer in some exemplary embodiments, Figure 4b is a schematic cross-sectional structure diagram of B-B in Figure 4a , Figure 4c is a schematic cross-sectional structure diagram of C-C in Figure 4aFIG. 2 shows a schematic diagram of a cross-sectional structure of a C-C pixel in the display device, the first pixel defining layer 21 includes a first sub-layer 41 and a second sub-layer 42; the first sub-layer 41 is disposed on a side of the plurality of first electrodes 121 away from the substrate and is provided with the plurality of first pixel openings 211; the second sub-layer 42 is disposed on a surface of the first sub-layer 41 away from the substrate, and the second sub-layer 42 includes a plurality of communication portions 421, the communication portions 421 are provided with the flow channels 1222 and are located between two adjacent first pixel openings 211 in the first direction X.

[0059] The second pixel defining layer can be a multi-layer structure. As shown in Figure 6 and Figure 7 The second pixel defining layer can be a multi-layer structure. As shown in Figure 6 FIG. 4 shows a schematic diagram of a planar structure after forming a third sub-layer 43 of the second pixel defining layer in some example embodiments, Figure 7 FIG. 5 shows a schematic diagram of a planar structure after forming a fourth sub-layer 44 of the second pixel defining layer in some example embodiments, the second pixel defining layer 22 can include the third sub-layer 43 and the fourth sub-layer 44. The third sub-layer 43 is disposed on a side of the first sub-layer 41 and the plurality of communication portions 421 away from the substrate and is provided with the plurality of second pixel openings 221; the second pixel openings 221 correspond in position to the first pixel openings 211 and together form the pixel openings 1221.

[0060] As shown in Figure 7 The fourth sub-layer 44 is disposed on a side of the third sub-layer 43 away from the substrate, the fourth sub-layer 44 includes a plurality of second dams 442 extending in a second direction Y, the second direction Y intersects the first direction X, and the plurality of second dams 442 are arranged at intervals in the first direction X; the plurality of pixel openings 1221 are arranged in multiple rows and multiple columns, a plurality of the pixel openings 1221 arranged in the first direction X form a column of pixel openings, a plurality of the pixel openings 1221 arranged in the second direction Y form a row of pixel openings, and a row of pixel openings is arranged between two adjacent second dams 442. Among them, the third sub-layer 43 and the fourth sub-layer 44 expose two ports of the plurality of flow channels, so that the flow channel is located between two adjacent pixel openings 1221 in the first direction X and connects two adjacent pixel openings 1221 in the first direction X.

[0061] The surface of the first functional layer away from the substrate is not higher than the surface of the third sub-layer 43 away from the substrate, and the light-emitting layer is further disposed on the surface of the third sub-layer 43 away from the substrate.

[0062] In some embodiments of the present example, as Figure 7As shown, after forming the first pixel defining layer 21 and the second pixel defining layer 22, a plurality of film layers of the first functional layer can be formed by using an inkjet printing process. For example, the first functional layer can include a hole injection layer and a hole transport layer which are sequentially stacked in a direction away from the substrate, and the hole injection layer and the hole transport layer can be formed by using the inkjet printing process. The hole injection layer and the hole transport layer can be located in the plurality of pixel openings and the plurality of flow channels, and the hole injection layer and the hole transport layer can block the plurality of flow channels, for example, the hole injection layer and the hole transport layer can fill the plurality of flow channels. The surface of the hole transport layer away from the substrate (i.e., the surface of the first functional layer away from the substrate) located in the pixel opening can be higher than the surface of the flow channel facing the substrate; the surface of the hole transport layer away from the substrate is not higher than the surface of the third sub-layer 43 away from the substrate, and the light-emitting layer can be arranged on the surface of the hole transport layer away from the substrate and located in the pixel opening 1221 and on the surface of the third sub-layer 43 away from the substrate between two adjacent second dams 442. The light-emitting layer can be formed by using the inkjet printing process, and the materials of the light-emitting layers in the plurality of pixel openings 1221 in the same row between two adjacent second dams 442 can be the same, so that the ink of the light-emitting layers of the plurality of sub-pixels in the same row emitting the same color light can flow between the plurality of pixel openings 1221 in the same row between two adjacent second dams 442, which is beneficial to improve the thickness uniformity of the light-emitting layers of the plurality of sub-pixels in the same row emitting the same color light. The light-emitting layers in the plurality of pixel openings 1221 in the same row between two adjacent second dams 442 can be connected as an integral structure.

[0063] In some embodiments of the present example, as shown in Figure 4a 、 Figure 6 and Figure 7 , the pixel defining layer (the first pixel defining layer 21 and the second pixel defining layer 22) can extend to the non-display area 200, and the circumferential edge of the pixel defining layer is located in the non-display area 200; the fourth sub-layer 44 can further include two first dams 441 located in the non-display area 200 and extending along the first direction X, and the two second dams 442 located in the non-display area 200 (the second dam 442 located in the non-display area 200 can be two or more) and the two first dams 441 form the circumferential edge of the fourth sub-layer 44. For example, as shown in Figure 4a 、 Figure 6 and Figure 7As shown, the circumferential edges of the first sub-layer 41, the third sub-layer 43 and the fourth sub-layer 44 can all be located within the non-display region 200, and the shapes of the circumferential edges of the first sub-layer 41, the third sub-layer 43 and the fourth sub-layer 44 can all be rectangular.

[0064] In some embodiments of the present example, as shown in Figure 7 As shown, the material of the third sub-layer 43 can be a hydrophilic material, and the material of the fourth sub-layer 44 can be a hydrophobic material. In this way, when the light-emitting layer is formed by using an inkjet printing process, the ink of the light-emitting layer can flow between the pixel openings 1221 in the same row between two adjacent second dams 442 of the fourth sub-layer 44, and is not prone to overflowing by climbing along the second dam 442 of the fourth sub-layer 44.

[0065] In some embodiments of the present example, as shown in Figure 4a As shown, the materials of the first sub-layer 41 and the second sub-layer 42 can both be hydrophilic materials. In this way, when the film layer of the first functional layer is formed by using an inkjet printing process, the ink of the first functional layer can flow between the pixel openings in the first direction X, thereby improving the thickness uniformity of the first functional layer in the pixel openings in the first direction X.

[0066] In yet another example of the present embodiment, as shown in Figure 8 , Figure 9a , Figure 9b , Figure 9c and Figure 9d As shown in Figure 8 is a schematic diagram of a planar structure after forming the first electrode 121 and the first sub-layer 41 of the first pixel defining layer on the driving backplate 110 in some other exemplary embodiments, Figure 9a is a schematic diagram of a planar structure after forming the second sub-layer 42 of the first pixel defining layer in some other exemplary embodiments, Figure 9b is a schematic diagram of an H-H cross-sectional structure in Figure 9a is a schematic diagram of an I-I cross-sectional structure in Figure 9c is a schematic diagram of an I-I cross-sectional structure in Figure 9a is a schematic diagram of an I-I cross-sectional structure in Figure 9d is a schematic diagram of an I-I cross-sectional structure in Figure 9aFIG. 3 is a schematic diagram of a cross-sectional structure of J-J in FIG. 2, the first pixel defining layer 21 can include a first sub-layer 41 and a second sub-layer 42; the first sub-layer 41 is disposed on a side of the plurality of first electrodes 121 away from the substrate and is provided with a plurality of first openings 411; the second sub-layer 42 is disposed on a surface of the first sub-layer 41 away from the substrate and is provided with a plurality of second openings 422 and the plurality of flow channels 1222, the second openings 422 correspond to the first openings 411 in position and jointly form the first pixel openings 211. Among them, the flow channel 1222 is located between two first pixel openings 211 adjacent in the first direction X and connects two first pixel openings 211 adjacent in the first direction X.

[0067] In this example, the first pixel defining layer 21 includes the first sub-layer 41 and the second sub-layer 42, that is, the first pixel defining layer 21 can be a multi-layer structure. In other embodiments, the first pixel defining layer 21 of the present embodiment can be a single-layer structure, that is, the first sub-layer 41 and the second sub-layer 42 in this example can be integrated as one film layer.

[0068] In this example, as shown in Figure 10a and Figure 10b , Figure 10a is a schematic diagram of a planar structure after forming the second pixel defining layer 22 in some other exemplary embodiments, Figure 10b is Figure 10a a schematic diagram of a cross-sectional structure of M-M in FIG. 2, the second pixel defining layer 22 is disposed on a side of the first pixel defining layer 21 away from the substrate and is provided with a plurality of second pixel openings 221, the second pixel openings 221 correspond to the first pixel openings 211 in position and jointly form the pixel openings 1221, and the plurality of second pixel openings 221 expose two ports of the plurality of flow channels 1222. In this way, the flow channel 1222 is located between two pixel openings 1221 adjacent in the first direction X and connects two pixel openings 1221 adjacent in the first direction X.

[0069] In some embodiments of this example, as shown in Figure 8 , Figure 9a , the material of the first pixel defining layer 21 can be a hydrophilic material, for example, the materials of the first sub-layer 41 and the second sub-layer 42 can be hydrophilic materials; as shown in Figure 10aAs shown, the material of the second pixel defining layer 22 can be a hydrophobic material. In this way, when forming the film layer of the first functional layer by using the inkjet printing process, the ink of the first functional layer can be beneficially flowed between the plurality of pixel openings 1221 in the first direction X, improving the thickness uniformity of the first functional layer within the plurality of pixel openings 1221 in the first direction X. When forming the light emitting layer by using the inkjet printing process, the ink of the light emitting layer is less likely to climb along the sidewall of the second pixel opening 221, and less likely to overflow.

[0070] In some other example embodiments, the pixel defining layer includes a first pixel defining layer and a second pixel defining layer.

[0071] The first pixel defining layer is disposed on a side of the plurality of first electrodes away from the substrate, and is provided with the plurality of pixel openings and the plurality of flow channels. Exemplarily, as shown in Figure 8 、 Figure 9a 、 Figure 9b 、 Figure 9c and Figure 9d shown, the first pixel defining layer 21 can include a first sub-layer 41 and a second sub-layer 42; the first sub-layer 41 is disposed on a side of the plurality of first electrodes 121 away from the substrate and is provided with a plurality of first openings 411; the second sub-layer 42 is disposed on a surface of the first sub-layer 41 away from the substrate and is provided with a plurality of second openings 422 and the plurality of flow channels 1222, the second openings 422 correspond to the first openings 411 in position and jointly form the pixel openings 1221, and the flow channels 1222 are located between two adjacent pixel openings 1221 in the first direction X and communicate the two adjacent pixel openings 1221 in the first direction X.

[0072] In this embodiment, the first pixel defining layer 21 includes the first sub-layer 41 and the second sub-layer 42, i.e., the first pixel defining layer 21 can be a multi-layer structure. In other embodiments, the first pixel defining layer 21 of this embodiment can be a single-layer structure, i.e., the first sub-layer 41 and the second sub-layer 42 in this embodiment can be integrated as one film layer.

[0073] As shown in Figure 11a 、 Figure 11b and Figure 11c shown, Figure 11a is a schematic diagram of the planar structure after forming the second pixel defining layer 22 in yet some example embodiments, Figure 11b is a schematic diagram of the K-K cross-sectional structure in Figure 11a , Figure 11c is a schematic diagram of the K-K cross-sectional structure in Figure 11aL-L cross-sectional structure diagram in FIG. 1B, the second pixel defining layer 22 is disposed on the side of the first pixel defining layer 21 away from the substrate, the second pixel defining layer 22 comprises a plurality of second dams 2202 extending along a second direction Y intersecting the first direction X, the plurality of second dams 2202 are arranged at intervals in the first direction X, and the second pixel defining layer 22 exposes two ports of the plurality of flow channels 1222; the plurality of pixel openings 1221 are arranged in rows and columns, the plurality of pixel openings 1221 arranged along the first direction X form a column of pixel openings, the plurality of pixel openings 1221 arranged along the second direction Y form a row of pixel openings, and one row of pixel openings is arranged between two adjacent second dams 2202.

[0074] The surface of the first functional layer away from the substrate is not higher than the surface of the first pixel defining layer 21 away from the substrate (in this example, the surface of the second sub-layer 42 away from the substrate), and the light-emitting layer is also disposed on the surface of the first pixel defining layer 21 away from the substrate (in this example, the surface of the second sub-layer 42 away from the substrate).

[0075] In some examples of this embodiment, the pixel defining layer (the first pixel defining layer 21 and the second pixel defining layer 22) can extend to the non-display area 200, and the circumferential edge of the pixel defining layer is located in the non-display area 200; as Figure 11a shown, the second pixel defining layer 22 also comprises two first dams 2201 extending along the first direction X located in the non-display area 200, and the two second dams 2202 located in the non-display area 200 (the second dams 2202 located in the non-display area 200 can be two or more) and the two first dams 2201 form the circumferential edge of the second pixel defining layer 22. Exemplarily, as Figure 8 、 Figure 9a and Figure 11a shown, the circumferential edges of the first sub-layer 41, the second sub-layer 42, and the second pixel defining layer 22 can all be located in the non-display area 200, and the shapes of the circumferential edges of the first sub-layer 41, the second sub-layer 42, and the second pixel defining layer 22 can all be rectangular.

[0076] In some examples of this embodiment, the material of the first pixel defining layer 21 can be a hydrophilic material, for example, as Figure 8 、 Figure 9a shown, the materials of the first sub-layer 41 and the second sub-layer 42 can be hydrophilic materials; as Figure 11a shown, the material of the second pixel defining layer 22 can be a hydrophobic material. In this way, as Figure 11aAs shown, when the inkjet printing process is used to form the first functional layer film layer, the ink of the first functional layer can flow between the plurality of pixel openings 1221 in the first direction X, improving the thickness uniformity of the first functional layer in the plurality of pixel openings 1221 in the first direction X. When the inkjet printing process is used to form the light-emitting layer, the ink of the light-emitting layer can flow between the plurality of pixel openings 1221 in the same row between two adjacent second dams 2202, and is not prone to overflowing along the second dams 2202 of the second pixel defining layer 22.

[0077] The display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.

[0078] In the drawings, the size of a constituent element, the thickness of a layer, or a region is sometimes exaggerated for the sake of clarity. Therefore, the embodiments of the present disclosure are not necessarily limited to such a size, and the shape and the size of each component in the drawings do not reflect the actual scale. Furthermore, the drawings schematically show some examples, and the embodiments of the present disclosure are not limited to the shapes or the values shown in the drawings.

[0079] In the description herein, "parallel" refers to a state in which two straight lines form an angle of -10° or more and 10° or less, and thus includes a state in which the angle is -5° or more and 5° or less. In addition, "perpendicular" refers to a state in which two straight lines form an angle of 80° or more and 100° or less, and thus includes a state in which the angle is 85° or more and 95° or less.

[0080] In the present specification, a triangle, a rectangle, a trapezoid, a pentagon, or a hexagon, etc. are not strictly so, and can be an approximate triangle, a rectangle, a trapezoid, a pentagon, or a hexagon, etc. There can be some small deformations due to tolerances, there can be chamfers, arc edges, and deformations, etc.

[0081] In the present specification, for the sake of convenience, words indicating directions or positional relationships such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are used to describe the positional relationship of the constituent elements with reference to the drawings, and are only for the convenience of describing the present specification and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction in which each constituent element is described. Therefore, it is not limited to the words described in the specification, and can be appropriately changed according to the situation.

[0082] In the description herein, unless specifically stated and limited otherwise, the terms "connected", "fixedly connected", "mounted", "assembled" shall be understood broadly, for example, can be fixedly connected, or detachably connected, or integrally connected; the terms "mounted", "connected", "fixedly connected" can be directly connected, or indirectly connected through an intermediate medium, or internal communication of two elements. The above terms can be understood according to the circumstances by those skilled in the art.

Claims

1. A display substrate comprising a display area and a non-display area located outside the display area; The display area includes a driving structure layer and a light-emitting structure layer sequentially stacked on a substrate, the light-emitting structure layer including a first electrode layer, a pixel defining layer, a light-emitting function layer, and a second electrode layer; the first electrode layer includes a plurality of first electrodes arranged on a side of the driving structure layer away from the substrate; The pixel defining layer is provided on a side of the plurality of first electrodes away from the substrate and is provided with a plurality of pixel openings and a plurality of flow channels; the pixel openings expose a surface of the first electrode away from the substrate; the flow channel is located between two adjacent pixel openings in a first direction and connects the two adjacent pixel openings in the first direction; The light-emitting functional layer includes a first functional layer and a light-emitting layer stacked in sequence in a direction away from the substrate; the first functional layer is provided on a surface of the plurality of first electrodes away from the substrate, the first functional layer includes one or more film layers, at least one film layer of the first functional layer is located within the plurality of pixel openings and within the plurality of flow channels; the light-emitting layer is provided on a surface of the first functional layer away from the substrate and is located within the pixel openings; The second electrode layer is provided on the surface of the light-emitting functional layer away from the substrate, and the first electrode, the light-emitting functional layer and the second electrode layer are stacked in sequence to form a light-emitting device; wherein, The pixel defining layer includes a first pixel defining layer and a second pixel defining layer; the first pixel defining layer is provided on a side of the plurality of first electrodes away from the substrate, and is provided with a plurality of first pixel openings and the plurality of flow channels, the first pixel openings exposing a surface of the first electrode away from the substrate, and the flow channel is located between two adjacent first pixel openings in a first direction; The second pixel defining layer is arranged on the side of the first pixel defining layer away from the substrate and is provided with a plurality of second pixel openings. The second pixel openings correspond to the positions of the first pixel openings and together form the pixel openings. The plurality of second pixel openings expose two ports of the plurality of flow channels.

2. The display substrate according to claim 1, wherein: The first pixel defining layer includes a first sublayer and a second sublayer; the first sublayer is arranged on the side of the multiple first electrodes away from the substrate and is provided with the multiple first pixel openings; the second sublayer is arranged on the surface of the first sublayer away from the substrate, and the second sublayer includes a plurality of connecting parts, the connecting parts are provided with the flow channels and are located between two adjacent first pixel openings in the first direction.

3. The display substrate according to claim 2, wherein: The second pixel defining layer is a single-layer structure; Alternatively, the second pixel defining layer includes a third sublayer and a fourth sublayer; the third sublayer is provided on a side of the first sublayer and the plurality of connecting portions away from the substrate, and is provided with the plurality of second pixel openings; the fourth sublayer is provided on a side of the third sublayer away from the substrate, the fourth sublayer includes a plurality of second dams extending along a second direction, the second direction intersecting the first direction, and the plurality of second dams being spaced apart in the first direction; the plurality of pixel openings are arranged in a plurality of rows and columns, the plurality of pixel openings arranged along the first direction forming a column of pixel openings, the plurality of pixel openings arranged along the second direction forming a row of pixel openings, and a row of pixel openings being provided between two adjacent second dams; The surface of the first functional layer away from the substrate is not higher than the surface of the third sublayer away from the substrate, and the light-emitting layer is further provided on the surface of the third sublayer away from the substrate.

4. The display substrate according to claim 3, wherein: The pixel defining layer extends to the non-display area, and the circumferential edge of the pixel defining layer is located in the non-display area; the fourth sublayer also includes two first dams extending along the first direction located in the non-display area, and the two second dams and two first dams located in the non-display area form the circumferential edge of the fourth sublayer.

5. The display substrate according to claim 3, wherein: The material of the third sub-layer is a hydrophilic material, and the material of the fourth sub-layer is a hydrophobic material.

6. The display substrate according to claim 2, wherein: The first sub-layer and the second sub-layer are both made of hydrophilic materials.

7. The display substrate according to claim 1, wherein: The first pixel defining layer includes a first sublayer and a second sublayer; the first sublayer is arranged on the side of the multiple first electrodes away from the substrate and is provided with multiple first openings; the second sublayer is arranged on the surface of the first sublayer away from the substrate and is provided with multiple second openings and the multiple flow channels, and the second openings correspond to the positions of the first openings and together form the first pixel openings.

8. The display substrate according to claim 1, wherein: The pixel defining layer includes a first pixel defining layer and a second pixel defining layer; the first pixel defining layer is provided on a side of the plurality of first electrodes away from the substrate and is provided with the plurality of pixel openings and the plurality of flow channels; The second pixel defining layer is disposed on a side of the first pixel defining layer away from the substrate, the second pixel defining layer comprising a plurality of second dams extending along a second direction, the second direction intersecting the first direction, the plurality of second dams being spaced apart in the first direction, and the second pixel defining layer exposing two ports of the plurality of flow channels; The plurality of pixel openings are arranged in a plurality of rows and columns, the plurality of pixel openings arranged along the first direction constitute a column of pixel openings, the plurality of pixel openings arranged along the second direction constitute a row of pixel openings, and a row of pixel openings is provided between two adjacent second dams; The surface of the first functional layer away from the substrate is no higher than the surface of the first pixel defining layer away from the substrate. The light-emitting layer is also provided on the surface of the first pixel defining layer away from the substrate.

9. The display substrate according to claim 8, wherein: The pixel defining layer extends to the non-display area, and the circumferential edge of the pixel defining layer is located in the non-display area; the second pixel defining layer also includes two first dams extending along the first direction located in the non-display area, and the two second dams and the two first dams located in the non-display area form the circumferential edge of the second pixel defining layer.

10. The display substrate according to claim 8, wherein: The first pixel defining layer is a single-layer structure; or, the first pixel defining layer includes a first sublayer and a second sublayer; the first sublayer is arranged on the side of the multiple first electrodes away from the substrate and is provided with multiple first openings; the second sublayer is arranged on the surface of the first sublayer away from the substrate and is provided with multiple second openings and the multiple flow channels, and the second openings correspond to the positions of the first openings and together form the pixel opening.

11. The display substrate according to claim 7 or 8, wherein: The material of the first pixel defining layer is a hydrophilic material, and the material of the second pixel defining layer is a hydrophobic material.

12. The display substrate according to claim 1, wherein: The plurality of pixel openings are arranged in a plurality of rows and columns, the plurality of pixel openings arranged along the first direction constitute a column of pixel openings, and the plurality of pixel openings arranged along the second direction constitute a row of pixel openings, and the first direction intersects the second direction; A distance between two adjacent pixel openings in the first direction is smaller than a distance between two adjacent pixel openings in the second direction.

13. The display substrate according to claim 1, wherein: The display area includes a plurality of pixel units arranged in an array on the substrate, the pixel unit includes a plurality of sub-pixels arranged in sequence along the first direction, and the plurality of sub-pixels located in the second direction emit light of the same color, and the first direction intersects the second direction.

14. The display substrate according to claim 1, wherein: At least one film layer of the first functional layer includes a plurality of first extension portions extending along the first direction. The first extension portions are an integral structure and are located within the plurality of pixel openings and the plurality of flow channels in the first direction.

15. The display substrate according to claim 1, wherein: The first functional layer includes a hole injection layer and a hole transport layer stacked in sequence in a direction away from the substrate. The hole injection layer and the hole transport layer are both located in the plurality of pixel openings and the plurality of flow channels.

16. A display device comprising the display substrate according to any one of claims 1 to 15.

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