Pixel defining structure, preparation method thereof and display substrate

Abstract

The invention belongs to the technical field of display, and relates to a pixel defining structure, a preparation method thereof and a display substrate. The pixel defining structure comprises a second flowing groove and a third flowing groove; the second flowing groove and the third flowing groove are isolated from each other; the second flowing groove comprises a first injection groove and a plurality of first branch grooves which are distributed side by side, and the first branch grooves are all communicated with the first injection groove; the third flowing groove comprises a second injection groove and a plurality of second branch grooves which are distributed side by side, and the second branch grooves are all communicated with the second injection groove; the first branch grooves and the second branch grooves are distributed side by side in a staggered mode. The functional ink can automatically cover all the pixel areas only by injecting from any position of the flowing groove by using an injection device, so that a plurality of groups of pixel units distributed side by side are formed, and the effect of reducing the preparation cost is achieved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a pixel defining structure and a preparation method thereof, and a display substrate. Background Art

[0002] The pixel unit in the existing display substrate includes multiple sub-pixel units (e.g., R, G, B), each sub-pixel unit is used to emit light of different colors (e.g., R sub-pixel emits red light; G sub-pixel emits green light; B sub-pixel emits blue light). In order to meet the requirements of the intensity and color of the generated light, the three sub-pixel units are usually distributed in groups, for example, R sub-pixels, G sub-pixels, and B sub-pixels are distributed side by side to form a pixel unit. When the pixel unit is prepared by evaporation and other technologies, different light-emitting layer functional inks need to be injected into multiple pixel areas to form sub-pixel units that emit light of different colors.

[0003] Due to the structural limitations of the pixel area defined by the pixel defining structure, in the prior art, if injection of multiple pixel areas needs to be completed simultaneously, multiple injection devices need to be used to inject the multiple pixel areas simultaneously. The equipment utilization rate is low and the process is complicated, resulting in high functional ink injection costs for the pixel areas and high preparation costs for the display substrate. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present application is the high cost of injecting functional ink into the pixel area defined by the pixel defining structure in the prior art.

[0005] In order to solve the above technical problems, the embodiment of the present application provides a pixel defining structure, and the pixel defining structure adopts the following technical solution:

[0006] The pixel defining structure includes a second flow groove and a third flow groove;

[0007] Wherein, the second flow slot and the third flow slot are isolated from each other;

[0008] The second flow slot includes a first injection slot and a plurality of first sub-slots arranged side by side, and the first sub-slots are all connected to the first injection slot;

[0009] The third flow slot includes a second injection slot and a plurality of second sub-slots arranged side by side, and the second sub-slots are all connected to the second injection slot;

[0010] The first sub-grooves and the second sub-grooves are arranged side by side and staggered.

[0011] Furthermore, the pixel defining structure further comprises a first flow groove, wherein the first flow groove is located in an area surrounded by outer walls of the plurality of first sub-grooves arranged side by side and outer walls of the plurality of second sub-grooves arranged side by side, and the first flow groove, the second flow groove and the third flow groove are all used for injecting functional ink;

[0012] And / or, the first injection groove and the second injection groove are respectively arranged on two opposite sides of the pixel defining structure, and the first sub-groove and the second sub-groove are both located between the first injection groove and the second injection groove.

[0013] Furthermore, the first flow groove includes a straight groove and a bent groove, the straight groove is located between the first sub-grooves and the second sub-grooves that are distributed side by side and adjacent to each other, the bent groove connects the adjacent straight grooves, and at least one of the bent grooves is an arc-shaped groove.

[0014] Furthermore, the first sub-slot is a straight slot, and the second sub-slot is also a straight slot. ；

[0015] The width of the straight groove is 5um to 100um; the widths of the first sub-groove and the second sub-groove may be the same or different.

[0016] Furthermore, the pixel defining structure also includes a first opening, a second opening and a third opening, wherein the first opening, the second opening and the third opening are respectively located on three different sides of the pixel defining structure and are respectively connected to the first flow groove, the first injection groove and the second injection groove.

[0017] Accordingly, an embodiment of the present application further provides a method for preparing a pixel defining structure, the method comprising:

[0018] providing a substrate;

[0019] A photoresist is coated on the substrate to form a pixel defining structure, and a second flow groove and a third flow groove are etched on the pixel defining structure; the pixel defining structure includes a second flow groove and a third flow groove; wherein the second flow groove and the third flow groove are isolated from each other; the second flow groove includes a first injection groove and a plurality of first sub-grooves arranged side by side, and the first sub-grooves are all connected to the first injection groove; the third flow groove includes a second injection groove and a plurality of second sub-grooves arranged side by side, and the second sub-grooves are all connected to the second injection groove; the first sub-grooves and the second sub-grooves are arranged side by side and staggered.

[0020] Furthermore, the step of coating photoresist on the substrate to form a pixel defining structure, and etching a second flow groove and a third flow groove on the pixel defining structure also includes:

[0021] forming a pixel defining structure, and etching a first flow groove, a second flow groove, and a third flow groove on the pixel defining structure;

[0022] Wherein, the first flow groove is located in the area surrounded by the outer walls of the plurality of first sub-grooves arranged side by side and the outer walls of the plurality of second sub-grooves arranged side by side, and the first flow groove, the second flow groove and the third flow groove are all used for injecting functional ink;

[0023] And / or, the first injection groove and the second injection groove are respectively arranged on two opposite sides of the pixel defining structure, and the first sub-groove and the second sub-groove are both located between the first injection groove and the second injection groove.

[0024] Furthermore, the steps of coating photoresist on the substrate to form a pixel defining structure, and etching a first flow groove, a second flow groove, and a third flow groove on the pixel defining structure include:

[0025] forming a material layer on the substrate;

[0026] forming a photoresist layer on the material layer, and performing exposure and development to form a photoresist pattern layer;

[0027] Using an etching process to form the photoresist layer and the material layer into the pixel defining structure having the first flow groove, the second flow groove and the third flow groove; or,

[0028] A first etching process is used to remove the photoresist pattern layer, and then a second etching process is used to form the pixel defining structure with the first flow groove, the second flow groove and the third flow groove.

[0029] Correspondingly, an embodiment of the present application further provides a display substrate, wherein the display substrate includes the above-mentioned pixel defining structure or a pixel defining structure obtained by the above-mentioned method for preparing the pixel defining structure.

[0030] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0031] (1) The pixel defining structure of the embodiment of the present application only needs to be injected from any place in the flow tank using an injection device, and the functional ink can automatically cover all pixel areas to form multiple groups of pixel units distributed side by side, thereby achieving the effect of reducing the preparation cost.

[0032] (2) When the pixel defining structure of the embodiment of the present application includes a first flow groove, the first flow groove, the second flow groove, and the third flow groove in the pixel defining structure divide the pixel area into three groups. The three groups of pixel areas can realize independent adjustment of the red, green, and blue colors of light. At this time, by adjusting the ratio of the three colors of light in the mixed light, the display effect of the light formed by the mixture of the three colors of light can be accurately adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the solutions in the present application or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 is a schematic structural diagram of a pixel definition structure according to an embodiment of the present application;

[0035] Figure 2 is a structural schematic diagram of another pixel definition structure according to an embodiment of the present application;

[0036] Figure 3 is a schematic structural diagram of a substrate in an embodiment of the present application;

[0037] Figure 4 yes Figure 1 A schematic diagram of the structure when the pixel defining structure is laid on the substrate;

[0038] Figure 5 is a flow chart of a method for preparing a pixel defining structure according to an embodiment of the present application;

[0039] Figure 6 It is a flow chart of a method for preparing a display substrate according to an embodiment of the present application.

[0040] Reference numerals:

[0041] Pixel defining structure 10, substrate 20, electrode layer 30;

[0042] The first flow groove 100, the bending groove 110, the straight groove 120, the second flow groove 200, the first branch groove 210, the first injection groove 220, the third flow groove 300, the second branch groove 310, the second injection groove 320, the vertical portion 410, the bending portion 420, the first opening 430, the second opening 440, and the third opening 450. DETAILED DESCRIPTION

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] An embodiment of a pixel defining structure 10 of the present application.

[0046] Figures 1 to 3 In the figure, the X direction is the up-down direction and the length direction, and the Y direction is the left-right direction and the width direction. Figure 1 The pixel defining structure 10 includes a pixel defining structure 10, a first flow groove 100, a second flow groove 200, and a third flow groove 300. The first flow groove 100, the second flow groove 200, and the third flow groove 300 are all arranged in the pixel defining structure and isolated from each other, that is, the first flow groove 110, the second flow groove 200, and the third flow groove 300 are not connected. The second flow groove 200 includes a first injection groove 220 and a plurality of first sub-grooves 210 distributed side by side, and the plurality of first sub-grooves 210 are connected to the first injection groove 220; the third flow groove 300 includes a second injection groove 320 and a plurality of second sub-grooves 310 distributed side by side, and the plurality of second sub-grooves 310 are connected to the second injection groove 320; the second flow groove 200 and the third flow groove 300 are relatively arranged on both sides of the upper and lower directions of the pixel defining structure, and the plurality of first sub-grooves 210 and the plurality of second sub-grooves 310 are arranged side by side and staggered one by one along the left and right directions, and the first injection groove 220 and the second injection groove 320 are respectively arranged on the opposite sides of the pixel defining structure 10, and the first sub-grooves 210 and the second sub-grooves 310 are both located between the first injection groove 220 and the second injection groove 320.

[0047] Multiple areas are defined between adjacent first sub-slots 210 and second sub-slots 310, and the first flow slot 100 is located in the area surrounded by the outer walls of multiple first sub-slots 210 and multiple second sub-slots 310 that are arranged side by side, that is, it bends and extends along the arrangement direction of the first sub-slots 210 and the second sub-slots 310, and passes through multiple adjacent first sub-slots 210 and second sub-slots 310 to form a serpentine slot. At this time, in the first flow slot 100, the part located between the first sub-slots 210 and the second sub-slots 310 is parallel to the first sub-slots 210 and the second sub-slots 310, and this part is a straight slot 120, and the part connecting the adjacent straight slots 120 is a bent slot 110.

[0048] When the pixel defining structure 10 is laid on the pixel area on the substrate where the electrode is laid, the pixel defining structure 10 will divide the pixel area into three groups. The electrodes in the three pixel area groups are controlled by different control circuits. Each pixel area group can adjust the luminous effect separately. At the same time, the plurality of straight grooves 120, the plurality of first sub-grooves 210, and the plurality of second sub-grooves 310 of the pixel defining structure 10 are arranged side by side and staggered. Among them, the straight grooves 120, the first sub-grooves 210, and the second sub-grooves 310 are effective luminous areas. For example, the first flow groove 100 is provided with blue light emitting layer functional ink, the second flow groove 200 is provided with red light emitting layer functional ink, and the third flow groove 300 is provided with green light emitting layer functional ink. At this time, the first sub-grooves 210, the straight grooves 120, and the second sub-grooves 310 will form staggered red, blue, green, and blue sub-pixel units. Since the final emitted light is formed by mixing red, green and blue light, the ratio of the three colors of light can be adjusted by independently adjusting the red, green and blue sub-pixel units, thereby more accurately making the final emitted light meet the expected effect. Therefore, the present application can improve the display effect of light. At the same time, since blue light has high energy and short life, each group of pixel units has two groups of blue light-emitting sub-pixel units, which can reduce the visual impact caused by the weakening of blue light. Therefore, the pixel area defined by the pixel definition structure 10 of this embodiment can meet the demand for good color light.

[0049] It can be understood that if the pixel defining structure 10 only includes the second flow groove 200 and the third flow groove 300, wherein the second flow groove 200 and the third flow groove 300 are isolated from each other; the second flow groove 200 includes the first injection groove 220 and a plurality of first sub-grooves 210 arranged side by side, and the first sub-grooves 210 are all connected to the first injection groove 220; the third flow groove 300 includes the second injection groove 320 and a plurality of second sub-grooves 310 arranged side by side, and the second sub-grooves 310 are all connected to the second injection groove 320; the first sub-grooves 210 and the second sub-grooves 310 are arranged side by side and staggered. At this time, the first sub-grooves 210 of the second flow groove 200 and the second sub-grooves 310 of the third flow groove 300 also form two groups of non-connected areas, which can realize the independent adjustment of the pixel units of two colors.

[0050] The plurality of first sub-grooves 210 and the plurality of second sub-grooves 310 are respectively connected to the first injection groove 220 and the second injection groove 320. Therefore, when injecting functional ink, only three injection devices are needed to inject from any of the first flow groove 100, the second flow groove 200, and the third flow groove 300, respectively, so that the functional ink can cover all pixel areas and form the effect of multiple groups of sub-pixel units distributed side by side. For example, when the functional ink is injected into any first sub-grooves 210, the functional ink can flow to the first injection groove 220, and then flow into each first sub-grooves 210 through the first injection groove 220. In summary, the pixel defining structure 10 of the embodiment of the present application can achieve the effect of reducing the cost of injecting functional ink into the pixel area.

[0051] It is understandable that the material of the pixel defining structure 10 is a photosensitive material, including one of polyimide, polymethyl methacrylate, fluorinated polyimide, and fluorinated polymethyl methacrylate. The first injection groove 220 and the second injection groove 320 are distributed on both sides of the pixel defining structure 10, and the plurality of first sub-grooves 210 and the plurality of second sub-grooves 310 are respectively connected to the first injection groove 220 and the second injection groove 320. Therefore, the functional ink can be directly injected from the first injection groove 220 and the second injection groove 320. At this time, the functional ink spreads to the plurality of first sub-grooves 210 and the plurality of second sub-grooves 310 at the same time, which helps to simultaneously complete the coverage of the functional ink in various pixel areas, thereby improving the morphological uniformity of the functional layer. The functional ink can also be injected from the middle section of the first flow groove 100, so that the functional ink spreads to the two ends of the first flow groove 100 respectively, so as to improve the preparation efficiency of the display substrate (not shown in the figure). Please refer to Figure 1 The first sub-groove 210 is a straight groove, and its groove length direction is toward the second injection groove 320; the second sub-groove 310 is also a straight groove, and its groove length direction is toward the first injection groove 220.

[0052] Further, refer to Figure 3, because the pixel area defined by the first injection groove 220, the second injection groove 320, and the bending groove 110 is not laid with electrodes and does not belong to the effective light-emitting area, the larger the area, the worse the overall optical display effect of the pixel area. Therefore, the optical display effect of the pixel area can be enhanced by reducing the area of ​​the first injection groove 220, the second injection groove 320, and the bending groove 110. Figure 1 When the liquid enters the bending groove 110, the original flow path needs to be changed. Therefore, when the bending groove 110 is an arc groove, it has uniform force, strong pressure resistance and good liquid guiding effect, which can prevent the liquid from overflowing the pixel defining structure 10 and increase the rate of liquid diversion flow, thereby improving the preparation efficiency of the display substrate. When the pixel defining structure 10 includes a bending groove 110 as an arc groove or multiple bending grooves 110 are all arc grooves, so as to match the layout of different pixel regions with electrode layers 30 of different shapes.

[0053] Furthermore, the first sub-slot 210 is a straight slot, and the second sub-slot 310 is also a straight slot. ；

[0054] Among them, the width of the straight groove is 5um to 100um; the width of the first sub-groove 210 and the second sub-groove 320 can be the same or different. When the first sub-groove 210 is a straight groove and the second sub-groove 320 is also a straight groove, the volume and shape of the functional ink that can be accommodated in each area are the same, which can improve the surface uniformity of the functional layer finally formed in the first sub-groove 210 and the second sub-groove 310, thereby improving the uniformity of light emission. The width of the straight groove is 5um to 100um, which can increase the effective light-emitting area and avoid the aperture ratio of the display substrate produced in the end being too large to affect the light-emitting effect. It is understandable that the width of the straight groove can be 5um, 10um, 15um, 20um, 25um, 30um, 35um, 40um, 45um, 50um, 55um, 60um, 65um, 70um, 75um, 80um, 85um, 90um, 95um, 100um.

[0055] For further reference, Figure 1 and Figure 2The pixel defining structure 10 also includes a bending portion 420 and a vertical portion 410, the bending portion 420 and the vertical portion 410 are connected, the vertical portion 410 is located between the straight groove 120 and the first sub-groove 210 or the second sub-groove 310, and the bending portion 420 is located between the bending groove 110 and the first injection groove 220, the second injection groove 320, the first sub-groove 210, and the second sub-groove 310. If the width of the vertical portion 410 is too large, for example, the width is greater than 100um, the gap between adjacent pixel areas is too large, resulting in a decrease in the aperture ratio and the luminous display effect of the display substrate. If the width of the vertical portion 410 is too small, for example, the width is less than 10um, it is impossible to limit the functional ink. Therefore, the width range of the bending portion 420 needs to be 10um to 100um, for example, 20um, 30um, 40um, 50um, 60um, 70um, 80um, 90um, 100um, etc. It can be understood that the thickness of the multiple vertical portions 410 can be the same to form a straight groove 120, a first sub-groove 210, and a second sub-groove 310 with consistent width, so that the luminous effect of the pixel area is uniform. The thickness of the multiple vertical portions 410 can also be inconsistent, thereby adjusting the luminous area of ​​different pixel areas according to the actual needs of the display substrate and changing the luminous intensity ratio of each color light.

[0056] As mentioned above, since the larger the area of ​​the bending groove 110 is, the worse the overall optical display effect of the pixel area is, the groove length of the bending groove 110 is often designed to be smaller than the groove length of the straight groove 120, thereby improving the optical display effect of the display substrate. Therefore, the functional ink moves for a longer time in the straight groove 120, and the accumulated impact force is larger, which will be applied to the bending portion 420. Since the groove length of the bending groove 110 is smaller, the functional ink moves for a shorter time in the bending groove 110, and the accumulated impact force is smaller, which is applied to the vertical portion 410. That is, during the flow of the functional ink, the impact force on the bending portion 420 is greater than that on the vertical portion 410.

[0057] If the width ratio of the vertical portion 410 to the bent portion 420 is less than 0.3:1, the distance of the functional ink from the first injection slot 220 and the second injection slot 320 to the first sub-slot 210 and the second sub-slot 310 will increase, resulting in low production efficiency of the display substrate. If the width ratio of the vertical portion 410 to the bent portion 420 is greater than 0.8:1, the width of the bent portion 420 is insufficient to withstand the impact of the ink, which may easily cause the functional ink to overflow from the bent portion 420 or cause the bent portion 420 to deform. Therefore, the width ratio of the vertical portion 410 to the bending portion 420 is (0.3~0.8):1. Specifically, the width ratio of the vertical portion 410 to the bending portion 420 can be set to 0.3:1, 0.35:1, 0.4:1, 0.45:1, 0.5:1, 0.55:1, 0.6:1, 0.65:1, 0.7:1, 0.75:1 or 0.8:1.

[0058] For further reference, Figures 1 to 3 , when the pixel defining structure 10 includes a first opening 430, a second opening 440, and a third opening 450 located on the side walls of the pixel defining structure 10 in different directions, and the first flow groove 100 is connected to the first opening 430, and the first injection groove 220 is connected to the second opening 440, when injecting functional ink, a cover plate can be laid on the pixel defining structure 10, and functional ink can be injected into the first injection groove 220, the second injection groove 320 and the first flow groove 100 from the first opening 430, the second opening 440, and the third opening 450 respectively. By laying a cover plate, the injection rate of the functional ink can be increased without causing the functional ink to overflow from the pixel defining structure 10 during the flow process, thereby improving the flow rate of the functional ink. It is understandable that when laying the cover plate, pressure can be applied to the cover plate to ensure that the cover plate can always fit with the pixel defining structure 10 without the cover plate being lifted up by the overflowed functional ink, thereby improving the morphological uniformity of each functional layer.

[0059] refer to Figure 4 This embodiment also provides a method for preparing a pixel defining structure. The method for preparing a pixel defining structure adopts the following technical solution:

[0060] Step S110, providing a substrate;

[0061] The substrate can be an object with a certain hardness and a processing plane, such as glass.

[0062] Step S120, coating a photoresist on the substrate to form a pixel defining structure, and etching a second flow groove and a third flow groove on the pixel defining structure, wherein the second flow groove and the third flow groove are isolated from each other; the second flow groove includes a first injection groove and a plurality of first sub-grooves arranged side by side, and the first sub-grooves are all connected to the first injection groove; the third flow groove includes a second injection groove and a plurality of second sub-grooves arranged side by side, and the second sub-grooves are all connected to the second injection groove; the first sub-grooves and the second sub-grooves are arranged side by side and staggered.

[0063] In summary, when injecting functional ink into the pixel defining structure 10 formed by the preparation method of the pixel defining structure provided in the embodiment of the present invention, only two injection devices are needed to inject from any place of the second flow groove and the third flow groove respectively, and the functional ink can automatically cover all pixel areas to form multiple groups of pixel units distributed side by side, thereby achieving the effect of reducing the preparation cost of the display substrate.

[0064] It can be understood that the preparation method of the pixel defining structure of the embodiment of the present application can also be used to prepare a pixel defining structure having a first flow groove, a second flow groove, and a third flow groove.

[0065] At this time, step 120 also includes:

[0066] forming a pixel defining structure, and etching a first flow groove, a second flow groove, and a third flow groove on the pixel defining structure;

[0067] The first flow groove is located in the area surrounded by the outer walls of the plurality of first sub-grooves arranged side by side and the outer walls of the plurality of second sub-grooves arranged side by side, and the first flow groove, the second flow groove and the third flow groove are all used to inject functional ink; and / or the first injection groove and the second injection groove are respectively arranged on opposite sides of the pixel defining structure, and the first sub-groove and the second sub-groove are both located between the first injection groove and the second injection groove. In this case, the first sub-groove, the first flow groove and the second sub-groove will form staggered red, blue, green and blue sub-pixel units, thereby adapting to the structural requirements of the existing three-color light-emitting device.

[0068] Further, step S120 includes: forming a material layer on the substrate;

[0069] forming a photoresist layer on the material layer, and performing exposure and development to form a photoresist pattern layer;

[0070] The pixel defining structure is formed by an etching process, and the pixel defining structure includes a first flow groove, a second flow groove, and a third flow groove. When forming a photoresist pattern layer, the area where the second flow groove and the third flow groove need to be set can be covered by a mask plate, thereby facilitating subsequent development and etching processes.

[0071] Furthermore, the step of forming a pixel defining structure by using an etching process includes:

[0072] Using an etching process to form a pixel defining structure having a first flow groove, a second flow groove and a third flow groove; or,

[0073] The first etching process is used to remove the photoresist pattern layer, and then the second etching process is used to form a pixel defining structure with a first flow groove, a second flow groove, and a third flow groove. That is, if the photoresist pattern layer and the pixel defining structure are etched together at one time through the etching process, the production efficiency of the pixel defining structure can be improved. If two etchings are used to remove the photoresist pattern layer and the pixel defining structure twice, the accuracy of the second flow groove and the third flow groove can be improved.

[0074] Further, the first injection groove and the second injection groove are respectively arranged on opposite sides of the pixel defining structure, and the first sub-groove and the second sub-groove are both located between the first injection groove and the second injection groove; and / or, the first flow groove includes a straight groove and a bent groove, the straight groove is located between the first sub-groove and the second sub-groove that are arranged side by side and adjacent, the bent groove connects the adjacent straight grooves, and at least one bent groove is an arc groove. Therefore, when the bent groove is an arc groove, it has uniform force, strong pressure resistance and good liquid guiding effect, which can prevent the liquid from overflowing the pixel defining structure and increase the speed of the liquid when it turns and flows, thereby improving the preparation efficiency of the display substrate containing the pixel defining structure.

[0075] And / or, the first sub-slot is a straight slot, and the second sub-slot is also a straight slot ； The width of the straight groove is 5um to 100um; the width of the first sub-groove and the second sub-groove can be the same or different. When the first sub-groove is a straight groove and the second sub-groove is also a straight groove, the volume and shape of the functional ink that can be accommodated in each area are the same, which can improve the surface uniformity of the functional layer finally formed in the first sub-groove and the second sub-groove, thereby improving the uniformity of luminescence. The width range of the straight groove has been described in the above embodiment and will not be described here.

[0076] The present embodiment also provides a display substrate, which includes an electrode layer 30, a substrate 20, and a pixel defining structure 10 as described above; the pixel defining structure 10 and the electrode layer 30 are arranged on the same surface of the substrate 20, and the electrode layer 30 is located in the first flow groove 100, the second flow groove 200, and the third flow groove 300. Since the display substrate includes the pixel defining structure 10 as described above, when injecting functional ink, only three injection devices are required to inject from any place of the first flow groove 100, the second flow groove 200, and the third flow groove 300 respectively, and the functional ink can automatically cover all pixel areas, forming multiple groups of pixel units distributed side by side, thereby achieving the effect of reducing the production cost of the display substrate.

[0077] The material of the electrode layer 30 can be selected from materials such as nano indium tin oxide (Indium Tin Oxides, ITO) or indium zinc oxide (Indium Zinc Oxides, IZO).

[0078] refer to Figure 5 This embodiment also provides a method for preparing a display substrate, and the method for preparing a display substrate adopts the following technical solution:

[0079] Step S210 provides a substrate and forms an electrode layer on the substrate;

[0080] Step S220: forming a pixel defining structure on the electrode layer and the substrate, wherein the pixel defining structure is the pixel defining structure of any one of the above embodiments, or the method for forming the pixel defining structure is the method for preparing the pixel defining structure of the above embodiments;

[0081] Step S230: injecting functional ink into the first flow groove, the second flow groove and the third flow groove to form each functional layer;

[0082] Step S240: packaging.

[0083] Since the pixel defining structure in the present method adopts the above pixel defining structure 10, only three injection devices are needed to inject from any position of the first flow groove 100, the second flow groove 200, and the third flow groove 300, respectively, and the functional ink can automatically cover all pixel areas ( Figure 1 and Figure 2 A dotted line range A in the figure shows an area), forming a plurality of groups of pixel units distributed side by side, thereby improving the preparation efficiency of the display substrate.

[0084] Step S210 may include providing a substrate 20, forming an electrode layer 30 on the substrate 20 by sputtering or thermal evaporation, laying a layer of photoresist on the electrode layer 30, etching a plurality of openings by photolithography technology, so that part of the electrode layer 30 is exposed to the outside, or referring to Figure 1 and Figure 2 A substrate 20 is provided, and a plurality of electrode layers 30 distributed in a matrix are arranged on the substrate 20. When a method of providing a substrate 20, forming an electrode layer 30 on the substrate 20, laying a layer of photoresist on the electrode layer 30, and etching a plurality of openings through photolithography technology to expose part of the electrode layer 30 to the outside is adopted, the preparation efficiency of the display substrate can be improved.

[0085] Between step S220 and step S230, step S221 may be further included, wherein after the preparation of the pixel defining structure 10 is completed, the substrate 20, the electrode layer 30 and the pixel defining structure 10 are cleaned and dust particles on the surface are removed, and then the surfaces of the substrate 20, the pixel defining structure 10 and the electrode layer 30 are dried with nitrogen gas, thereby achieving control of the cleanliness of the substrate surface.

[0086] Step S230 includes using three injection devices multiple times to simultaneously inject functional ink into the first flow groove 100, the second flow groove 200 and the third flow groove 300, thereby forming functional layers such as hole transport / injection, light-emitting layer, electron transport / injection layer in batches. After each injection of the functional ink is completed, the display substrate can be dried. The drying process can be carried out by hot plate baking or vacuum drying. When using a drying device such as VCD for vacuum solvent extraction and drying, the pressure in the vacuum drying device should not be too small, for example, less than 1 Pascal. Too small a pressure will cause the solvent in the functional ink to evaporate quickly, thereby reducing the fluidity of the functional ink. In order to ensure the drying effect of the functional ink while allowing the functional ink to flow smoothly, the vacuum pressure in the drying device can range from 1 Pascal to 100 Pascals.

[0087] When using a hot plate for baking and drying, if the baking temperature is too low or the baking time is too short, the functional ink will not be completely dried. If the baking temperature is too high, the functional ink will not completely cover the pixel area, and the functional layer formed will have an uneven morphology. If the baking time is too long, the display substrate processing time will be too long, so the baking temperature range is 40 degrees Celsius to 150 degrees Celsius, and the baking time range is 10 minutes to 30 minutes. When the baking temperature is 100 degrees Celsius and the baking time is 20 minutes, the functional layer formed by the functional ink has a uniform morphology and covers a wide pixel area.

[0088] It is understandable that any different light-emitting layer functional inks can be injected into the first flow groove 100, the second flow groove 200, and the third flow groove 300. Blue light-emitting layer functional ink can also be injected into the first flow groove 100, red light-emitting layer functional ink can be injected into the second flow groove 200, and green light-emitting layer functional ink can be injected into the third flow groove 300, thereby forming red, blue, green, and blue staggered sub-pixel units in the first sub-groove 210, the straight groove 120, and the second sub-groove 310. In step S230, the flow of functional ink can also be accelerated by tilting the substrate 20, placing the substrate on an ultrasonic device, etc., to avoid blockage of functional ink and uneven morphology of the formed functional layer. The functional ink can be prevented from drying too quickly to cause liquid blockage and uneven morphology of the functional layer by increasing the concentration of the functional ink in the environment and lowering the temperature of the functional substrate.

[0089] Step S240 includes using a glass substrate to cover the pixel defining structure 10 or only cover the area where the straight groove 120, the first sub-groove 210, and the second sub-groove 310 are located in a nitrogen environment. The use of a nitrogen environment package can prevent the presence of oxygen and water vapor in the display substrate from causing a display substrate failure.

[0090] For further reference, Figure 1 and 3When the pixel defining structure 10 includes a first opening 430, a second opening 440, and a third opening 450 located on sidewalls of the pixel defining structure 10 in different directions, and the first flow groove 100 is connected to the first opening 430, the first injection groove 220 is connected to the second opening 440, and the second injection groove 320 is connected to the third opening 450, step S230 may further include:

[0091] A cover plate is laid on the pixel defining structure 10:

[0092] Functional ink is injected into the first injection groove 220 , the second injection groove 320 and the first flow groove 100 from the first opening 430 , the second opening 440 and the third opening 450 , respectively.

[0093] The present application also provides a display substrate, which includes the pixel defining structure in the above embodiment, or the pixel defining structure in the display substrate is prepared by the preparation method of the form defining layer in the above embodiment. It is understood that the display substrate may include electronic display products such as mobile phones, tablet computers, computer monitors, and vehicle control display screens.

[0094] For further information, please refer to Figures 1 to 3 , the display substrate further includes an electrode layer 30 and a substrate 20, the pixel defining structure 10 and the electrode layer 30 are arranged on the same surface of the substrate 20, and the electrode layer 30 is located in the first flow groove 100, the second flow groove 200 and the third flow groove 300;

[0095] Preferably, please refer to Figure 1 and Figure 2 When the first flow groove includes a straight groove and a bent groove, the electrode 30 is only arranged in the straight groove 120, the first sub-groove 210 and the second sub-groove 310. It can be understood that, as described in the above-mentioned embodiments, the luminescence of the pixel area in the first injection groove 220, the second injection groove 320 and the bent groove 110 will affect the overall optical display effect of the display substrate. Therefore, when the first flow groove 100 includes a straight groove 120 and a bent groove 110, the electrode layer 30 can be only arranged in the range A, that is, the straight groove 120, the first sub-groove 210 and the second sub-groove 310, thereby improving the overall optical display effect of the display substrate.

[0096] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

[0097] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, combinations, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pixel defining structure, characterized in that: The pixel defining structure includes a second flow groove and a third flow groove; Wherein, the second flow slot and the third flow slot are isolated from each other; The second flow slot includes a first injection slot and a plurality of first sub-slots arranged side by side, and the first sub-slots are all connected to the first injection slot; The third flow slot includes a second injection slot and a plurality of second sub-slots arranged side by side, and the second sub-slots are all connected to the second injection slot; The first sub-grooves and the second sub-grooves are arranged side by side and staggered.

2. The pixel defining structure according to claim 1, wherein: The pixel defining structure further comprises a first flow groove, wherein the first flow groove is located in a region surrounded by outer walls of the plurality of first sub-grooves arranged side by side and outer walls of the plurality of second sub-grooves arranged side by side, and the first flow groove, the second flow groove and the third flow groove are all used for injecting functional ink; And / or, the first injection groove and the second injection groove are respectively arranged on two opposite sides of the pixel defining structure, and the first sub-groove and the second sub-groove are both located between the first injection groove and the second injection groove.

3. The pixel defining structure according to claim 2, wherein: The first flow groove includes a straight groove and a bent groove, the straight groove is located between the first sub-grooves and the second sub-grooves that are distributed side by side and adjacent to each other, the bent groove connects the adjacent straight grooves, and at least one of the bent grooves is an arc-shaped groove.

4. The pixel defining structure according to any one of claims 1 to 3, characterized in that: The first slot is a straight slot, and the second slot is also a straight slot ； The width of the straight groove is 5um to 100um; the widths of the first sub-groove and the second sub-groove may be the same or different.

5. The pixel defining structure according to claim 2, wherein: The pixel defining structure also includes a first opening, a second opening and a third opening. The first opening, the second opening and the third opening are respectively located on three different sides of the pixel defining structure and are respectively connected to the first flow groove, the first injection groove and the second injection groove.

6. A method for preparing a pixel defining structure, characterized in that: The method comprises: providing a substrate; Coating photoresist on the substrate to form a pixel defining structure, and etching a second flow groove and a third flow groove on the pixel defining structure; Among them, the second flow groove and the third flow groove are isolated from each other; the second flow groove includes a first injection groove and a plurality of first sub-grooves distributed side by side, and the first sub-grooves are all connected to the first injection groove; the third flow groove includes a second injection groove and a plurality of second sub-grooves distributed side by side, and the second sub-grooves are all connected to the second injection groove; the first sub-grooves and the second sub-grooves are arranged side by side and staggered.

7. The method for preparing a pixel defining structure according to claim 6, wherein: The step of coating photoresist on the substrate to form a pixel defining structure, and etching a second flow groove and a third flow groove on the pixel defining structure also includes: Etching a first flow channel on the pixel defining structure; Among them, the first flow groove is located in the area surrounded by the outer walls of the multiple first sub-grooves distributed side by side and the outer walls of the multiple second sub-grooves distributed side by side, and the first flow groove, the second flow groove and the third flow groove are all used to inject functional ink.

8. The method for preparing a pixel defining structure according to claim 7, characterized in that: The steps of coating photoresist on the substrate to form a pixel defining structure, and etching a first flow groove, a second flow groove, and a third flow groove on the pixel defining structure include: forming a material layer on the substrate; forming a photoresist layer on the material layer, and performing exposure and development to form a photoresist pattern layer; Using an etching process to form the photoresist layer and the material layer into the pixel defining structure having the first flow groove, the second flow groove and the third flow groove; or, A first etching process is used to remove the photoresist pattern layer, and then a second etching process is used to form the pixel defining structure with the first flow groove, the second flow groove and the third flow groove.

9. The method for preparing a pixel defining structure according to any one of claims 6 to 8, characterized in that: The first injection groove and the second injection groove are respectively arranged on two opposite sides of the pixel defining structure, and the first sub-groove and the second sub-groove are both located between the first injection groove and the second injection groove; And / or, the first flow groove includes a straight groove and a bent groove, the straight groove is located between the first sub-grooves and the second sub-grooves that are arranged side by side and adjacent to each other, the bent groove connects the adjacent straight grooves, and at least one of the bent grooves is an arc groove; And / or, the first sub-slot is a straight slot, and the second sub-slot is also a straight slot ； The width of the straight groove is 5um to 100um; the widths of the first sub-groove and the second sub-groove may be the same or different.

10. A display substrate, characterized in that: The display substrate includes the pixel defining structure described in any one of claims 1 to 5 or a pixel defining structure obtained by the method for preparing the pixel defining structure described in any one of claims 6 to 9.

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