An inkjet printing method, a substrate, a display panel and a display device

Abstract

The application relates to the technical field of display, in particular to an inkjet printing method, a substrate, a display panel and a display device. The substrate provided by the application can improve the printing resolution without improving the printing precision of a printing device.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to an inkjet printing method, a substrate, a display panel, and a display device. Background Technology

[0002] Currently, OLED and QLED displays are gradually becoming mainstream technologies. Inkjet printing is the mainstream method for manufacturing OLED and QLED displays. To achieve high resolution, pixel size is generally reduced, which requires inkjet printers to have higher precision, resulting in a significant increase in production costs. Summary of the Invention

[0003] Based on this, embodiments of this application provide an inkjet printing method, a substrate, a display panel, and a display device.

[0004] This application provides an inkjet printing method, the method comprising:

[0005] A substrate is provided, the substrate including a substrate and a pixel defining layer disposed on the substrate, the pixel defining layer defining a plurality of pixel columns, the pixel columns including a plurality of pixel opening regions;

[0006] The width of the widest part of at least one of the pixel opening regions in the pixel column is greater than or equal to the diameter of the ink droplet to be printed.

[0007] This application provides a substrate, the substrate including a substrate and a pixel defining layer disposed on the substrate, wherein:

[0008] The pixel defining layer defines a plurality of pixel columns, each pixel column including a plurality of pixel opening regions, wherein the width of the widest part of at least one pixel opening region in the pixel column is greater than or equal to the diameter of the ink droplet to be printed; and / or,

[0009] The pixel delineation layer defines a plurality of pixel columns, wherein at least two adjacent pixel columns each independently include alternating pixel opening regions and connecting channels, the connecting channels being used to connect two adjacent pixel opening regions in the pixel column, and in two adjacent pixel columns, the connecting channel of one pixel column is arranged side by side with the pixel opening region of the other pixel column.

[0010] This application also provides a display panel, including a substrate printed using the inkjet printing method described above; or including the substrate described above.

[0011] This application embodiment also provides a display device, including a substrate printed using the inkjet printing method described above;

[0012] Or it may include the aforementioned substrate;

[0013] Or it may include the display panel mentioned above.

[0014] Compared with the prior art, the embodiments of this application have the following main advantages:

[0015] The pixel aperture structure of this application embodiment can improve printing resolution without improving the printing accuracy of the printing device. Attached Figure Description

[0016] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a substrate according to an embodiment of this application;

[0018] Figure 2 yes Figure 1 A cross-sectional view of the substrate along AA;

[0019] Figure 3 yes Figure 1 A schematic diagram of the pixel opening region;

[0020] Figure 4 This is another schematic diagram of the substrate structure in the embodiments of this application;

[0021] Figure 5 yes Figure 4 A cross-sectional view of the substrate along BB;

[0022] Figure 6 yes Figure 4 A schematic diagram of an embodiment of the pixel opening region;

[0023] Figure 7 This is a schematic projection of the first defining portion on the substrate according to an embodiment of this application;

[0024] Figure 8 middle Figure 4 A cross-sectional view of the substrate along CC;

[0025] Figure 9 This is another schematic diagram of the substrate structure in an embodiment of this application;

[0026] Figure 10 yes Figure 9 A cross-sectional view of the substrate along DD;

[0027] Figure 11 yes Figure 9 A cross-sectional view of the substrate along EE;

[0028] Figure 12 yes Figure 9 Another embodiment of the substrate is shown in a cross-sectional view along EE;

[0029] Figure 13 yes Figure 9 A schematic diagram of the middle pixel opening region and the second boundary region;

[0030] Figure 14 This is a schematic diagram of the structure of a display panel according to an embodiment of this application;

[0031] Figure 15 This is a schematic diagram of the display panel being lit according to another embodiment of this application. Detailed Implementation

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] This application provides a substrate, such as... Figure 1 and Figure 2 As shown, the substrate includes a substrate 1 and a pixel defining layer 2. The pixel defining layer 2 defines a plurality of pixel columns 2a. Each pixel column 2a includes a plurality of pixel opening regions 21. The width of the widest part of at least one pixel opening region 21 in the pixel column 2a is greater than or equal to the diameter of the ink droplet to be printed. Specifically, along the length direction of the pixel opening region 21, i.e. Figure 1As shown in direction D2, the width of the pixel opening area 21 is gradually varied at different positions, and the width of the widest part of the pixel opening area 21 is greater than or equal to the diameter of the ink droplet to be printed. For multiple pixel columns 2a in the substrate, the width of the widest part of the pixel opening area 21 in the pixel column 2a being greater than or equal to the diameter of the ink droplet to be printed can prevent ink droplets from overflowing into other pixel columns 2a and prevent color mixing between pixel columns 2a of different colors. This can improve printing resolution and printing effect without increasing the printing accuracy of the printing device.

[0035] In this embodiment, the width refers to the size of the pixel opening area 21 in a first direction, i.e., the first direction is... Figure 1 As shown in D1, which is parallel to the extending direction of the substrate 1, the width gradient of the pixel opening region 21 at different positions can be a gradual increase or decrease along one direction, or a gradual increase followed by a decrease, or an alternating increase and decrease, for example... Figure 1 and Figure 3 The pixel opening region 21 shown is the case where the width first increases and then decreases. Figure 3 The image shows the widths W1, W2, and W3 at three different locations, where W1 < W3 < W2, and W2 is the width at the widest point, which is the maximum width of the pixel opening region 21.

[0036] In this embodiment, the width of the widest part of at least one pixel opening region 21 in the pixel column 2a is greater than or equal to the maximum diameter of the ink droplet to be printed. The maximum diameter of the ink droplet printed by the inkjet printer is 1μm to 50μm, optionally, the maximum diameter of the ink droplet is 1μm to 30μm. In this embodiment, the diameter of the ink droplet printed by the inkjet printer within this range can meet the requirements of a high-resolution display. The width of the widest part of the pixel opening region 21 in this embodiment is greater than the maximum diameter of the ink droplet, which can completely accommodate the printed ink droplet and avoid color bleeding between different colored pixel opening regions 21, thus meeting the printing requirements of a high-resolution display.

[0037] In one embodiment, the widest point of at least one pixel opening region 21 in the pixel column 2a is located in the middle of the pixel opening region 21. During inkjet printing, the ink droplets are printed in the middle region of the pixel opening region 21 and then spread out from the middle region to the surrounding region, which is beneficial to forming a uniform film layer.

[0038] In this embodiment, based on the maximum diameter of the ink droplet, the width of the widest part of at least one of the pixel opening regions 21 in the pixel column 2a is greater than or equal to 1 μm. Printing at this position can completely accommodate the ink droplet, avoiding ink droplet overflow and color mixing in pixel opening regions 21 of different colors. Since the size of some areas of the pixel opening region 21 is small, more areas can be set on the substrate to set more pixel opening regions 21. This structure of the pixel opening region 21 can improve the printing resolution without improving the printing accuracy of the printing device.

[0039] In one embodiment, the maximum width of at least one pixel opening region 21 in the pixel column 2a is 1μm to 50μm, and optionally, the width of the widest part of at least one pixel opening region 21 is 5μm to 45μm.

[0040] Optionally, the width of the widest part of at least one of the pixel opening regions 21 in the pixel column 2a is a value between any one or any two of the following: 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 15μm, 20μm, 25μm, 30μm, 31μm, 32μm, 33μm, 34μm, 35μm, 40μm, 45μm, and 50μm.

[0041] In this embodiment, by setting the connection channel 22, the multiple pixel opening areas 21 of the pixel column 2a are connected in sequence, so that when the same color ink is printed in the same pixel column 2a, the ink can flow between two adjacent pixel opening areas 21. The ink in the pixel opening area 21 with a larger printing volume can automatically flow to the pixel opening area 21 with a smaller printing volume, reducing the requirements for printing accuracy.

[0042] Based on the above embodiments, or independently of the above embodiments, such as Figure 4 and Figure 5 As shown, this application also provides a substrate, the substrate including a substrate 1 and a pixel defining layer 2, the pixel defining layer 2 defining a plurality of pixel columns 2a, wherein at least two adjacent pixel columns 2a each independently include alternately arranged pixel opening regions 21 and connecting channels 22, the connecting channels 22 being used to connect two adjacent pixel opening regions 21 in the pixel column 2a, and in two adjacent pixel columns 2a, the connecting channel 22 of one pixel column 2a is arranged side by side with the pixel opening region 21 of the other pixel column 2a.

[0043] In one embodiment, among two adjacent pixel columns 2a, the connecting channel 22 of one pixel column 2a has a first central cross-section perpendicular to the surface of the substrate, and the pixel opening area 21 of the other pixel column 2a has a second central cross-section perpendicular to the surface of the substrate. The side-by-side arrangement satisfies the following condition: the first central cross-section and the second central cross-section are coplanar or parallel, and the distance between the first central cross-section and the second central cross-section when they are parallel is less than a preset value. In this embodiment, the first central cross-section refers to the cross-section passing through the central axis of the connecting channel 22, and the second central cross-section refers to the cross-section passing through the central axis of the pixel opening area 21. Both of these central axes are perpendicular to the extending direction of the pixel column 2a.

[0044] In some embodiments, the preset value is 0.1 μm to 4 μm; alternatively, the preset value is 0.1 μm to 2 μm. This range allows the pixel aperture area and the connecting channel to be arranged alternately side by side in the direction perpendicular to pixel column 2a (i.e., the D1 direction), which is beneficial for forming a more compact pixel arrangement and improving the pixel aperture ratio.

[0045] Optionally, the preset value is any one or any two of 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1μm, 1.5μm, and 2μm.

[0046] In one embodiment, the width of the widest point of the orthographic projection of at least one pixel opening region 21 in the pixel column 2a onto the substrate 1 is greater than or equal to the diameter of the ink droplet to be printed.

[0047] Specifically, such as Figure 4 and Figure 6 As shown, in the first direction D1, the width of the middle part of the orthographic projection of the pixel opening region 21 onto the substrate 1 is the maximum width of the pixel opening region 21; wherein, the substrate 1 is a flat plate structure, the first direction D1 is parallel to the extension direction of the substrate 1, and is parallel to the extension direction of the pixel column 2a (i.e., Figure 4 The direction shown in D2 intersects with the direction shown in D2, wherein the length direction of the pixel opening region 21 is consistent with the extension direction of the pixel column 2a.

[0048] Based on the maximum diameter of the ink droplets described in the above embodiments, the width of the middle part of the orthographic projection of at least one pixel opening region 21 in the pixel column 2a onto the substrate 1 is greater than or equal to 1 μm; printing in the middle of the pixel opening region 21 can completely accommodate the ink droplets, avoiding ink droplet overflow and color mixing in pixel opening regions 21 of different colors. Since the size of some areas of the pixel opening region 21 is small, more areas can be set on the substrate to provide more pixel opening regions 21. This structure of the pixel opening region 21 can improve the printing resolution without improving the printing accuracy of the printing device.

[0049] like Figure 6 As shown, in the first direction D1, the width W4 of the middle part of the orthogonal projection of at least one pixel opening region 21 in the pixel column 2a onto the substrate 1 is 1μm to 50μm; optionally, the width W4 of the middle part of the orthogonal projection of at least one pixel opening region 21 in the pixel column 2a onto the substrate 1 is 5μm to 45μm.

[0050] Optionally, the width W4 of the middle portion of the orthographic projection of at least one pixel opening region 21 in the pixel column 2a onto the substrate 1 is a value between any one or any two of the following: 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 15μm, 20μm, 25μm, 30μm, 31μm, 32μm, 33μm, 34μm, 35μm, 40μm, 45μm, and 50μm.

[0051] In one embodiment, the orthographic projection of the pixel opening region 21 onto the substrate 1 is a pattern that is wide in the middle and narrow at both ends; during inkjet printing, the ink droplets are printed in the middle region of the pixel opening region 21 and then spread out from the middle region to the surrounding region, which is beneficial for forming a uniform film layer.

[0052] In one embodiment, the pattern is an axisymmetric pattern, which on the one hand facilitates a more compact arrangement of the pixel opening areas 21 and improves the pixel aperture ratio, and on the other hand provides a wider area in the middle to accommodate the printed ink droplets, avoiding ink droplet overflow and color bleeding in the pixel opening areas 21 of different colors, and improving the printing resolution without improving the printing accuracy of the printing device.

[0053] In one embodiment, when the graphic is an axisymmetric graphic, the orthographic projection of at least one of the pixel opening regions 21 in the pixel column 2a onto the substrate 1 is circular, elliptical, or polygonal. The polygon includes triangles, rectangles, rhombuses, trapezoids, hexagons, octagons, or decagons. Using these shapes and structures is beneficial for the arrangement of the pixel opening regions 21 and improves the pixel opening region ratio.

[0054] In this embodiment, as Figure 6 As shown, in the first direction D1, the width at both ends of the orthographic projection of the pixel opening region 21 onto the substrate 1 is the minimum width of the pixel opening region 21, which is greater than or equal to 0.1 μm. While the width at both ends of the orthographic projection of the pixel opening region 21 onto the substrate 1 is smaller than the width at the middle, it also needs to be greater than or equal to 0.1 μm to ensure that the cross-section of the connecting channel 22 is large enough to allow ink to flow smoothly in the connecting channel, enabling ink to flow freely between adjacent pixel opening regions 21.

[0055] Specifically, the minimum width W5 of the pixel opening region 21 is 0.1μm to 40μm; preferably, the minimum width W5 of the pixel opening region 21 is 0.5μm to 30μm.

[0056] Optionally, the minimum width W5 of the pixel opening region 21 can be any one or any two of the following values: 0.1μm, 0.5μm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 15μm, 20μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, 35μm, and 40μm.

[0057] In some embodiments, such as Figure 6 As shown, in the extending direction of the pixel column 2a, the length L1 of the pixel opening region 21 is 60μm to 140μm, optionally, the length L1 of the pixel opening region 21 is 70μm to 100μm. Due to the flow characteristics of printing ink, the ink printed in the pixel opening region 21 will spontaneously flow along the extending direction of the pixel column 2a. As long as the ink is printed at the widest position in the middle of the pixel opening region 21, the printing ink will automatically level out to cover the entire pixel opening region 21. In this embodiment, the range of the length L1 of the pixel opening region 21 is conducive to the automatic leveling of ink droplets in the pixel opening region 21 to form a uniform film layer.

[0058] Optionally, the length L1 of the pixel opening region 21 can be any one or any two of 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 110μm, 120μm, 130μm, and 140μm.

[0059] In some embodiments, the length of the connection channel 22 is 10μm to 15μm, and optionally, the length of the connection channel 22 is 11μm to 14μm; the length of the connection channel 22 is guaranteed to provide a shorter ink flow path within this range, so as to facilitate the flow of ink between two adjacent pixel opening areas 21.

[0060] Optionally, the length of the connection channel 22 can be any one or any two of 10μm, 11μm, 12μm, 13μm, 14μm, and 15μm.

[0061] In some embodiments, the width of the connecting channel 22 is 0.1μm to 40μm, and optionally, the width of the connecting channel 22 is 0.5μm to 30μm. The connecting channel 22 is connected to both ends of the pixel opening area 21, and its width within this range can ensure that the cross-section of the connecting channel 22 is large enough so that the ink can flow smoothly in the connecting channel and realize the free flow of ink in two adjacent pixel opening areas 21.

[0062] In one embodiment, such as Figure 4 As shown, the pixel defining layer 2 defines two or more pixel columns 2a, and the extending directions of each pixel column 2a are parallel to each other. Specifically, the pixel defining layer 2 further includes a first defining portion 23, which is located between two adjacent pixel columns 2a. Two first defining portions 23 are spaced apart to define one pixel column 2a, and multiple first defining portions 23 are spaced apart to define multiple pixel columns 2a.

[0063] In one embodiment, such as Figure 7 As shown, the orthographic projection of the first defining portion 23 on the substrate 1 extends in the extending direction of the pixel column 2a. This arrangement helps to increase the width of the pixel opening area 21, allowing the pixel opening area 21 to accommodate a larger volume of ink and reducing printing difficulty.

[0064] Specifically, when the first defining portion 23 extends in orthographic projection on the substrate 1, it forms a wave-like shape. The pixel opening area 21 located in one pixel column 2a is arranged side by side with the connecting channel 22 located in the other pixel column 2a. This is equivalent to the peak of the orthographic projection of the first defining portion 23 being arranged side by side with the trough of the other orthographic projection in the first direction D1. That is, the peak of the orthographic projection of the first defining portion 23 is directly opposite the trough of the other orthographic projection in the first direction D1. This makes the pixel opening area 21 located in one pixel column 2a directly opposite the connecting channel 22 located in the other pixel column 2a in the first direction D1, which is beneficial to the orthographic projection of the pixel opening area 21 on the substrate 1. The projection is circular, elliptical, or polygonal, including triangles, rectangles, rhombuses, trapezoids, hexagons, octagons, or decagons, preferably symmetrical polygons. The wavy structure allows the pixel opening area 21 to have a wider width, which can accommodate larger ink droplets and a greater amount of ink droplets, reducing the requirements for printing accuracy. At the same time, it makes the distribution of the pixel opening area 21 more compact, thereby forming more pixel opening areas 21 on the substrate, which can improve the pixel opening area ratio. It can also produce display panels with higher pixel resolution even at lower printing accuracy, and it also allows some high-viscosity, high-molecular-weight inks to be printed at lower concentrations, reducing the printing difficulty.

[0065] In one embodiment, such as Figure 7 As shown, in the first direction D1, the width W6 of the first defining portion 23 is 10μm to 30μm, optionally, the width of the first defining portion 23 is 15μm to 25μm. Within this range, the width W6 of the first defining portion 23 can achieve a high pixel aperture ratio while avoiding bridging during pixel printing.

[0066] Optionally, the width W6 of the first defining portion 23 can be any one or any two of 10μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, and 30μm.

[0067] In one embodiment, such as Figure 8 As shown, relative to the substrate 1, the average height H1 of the first defining portion 23 is 0.5 μm to 1 μm. Optionally, the average height H1 of the first defining portion 23 is 0.6 μm to 1 μm. The height of the first defining portion 23 within this range ensures that ink does not cross the first defining portion 23 and enter adjacent pixel columns 2a, avoiding bridging during pixel printing, reducing the mixing of colors between different pixels, and improving the purity of the light-emitting device's color.

[0068] Optionally, the average height H1 of the first defining portion 23 can be any one or any two of 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, and 1μm.

[0069] In one embodiment, such as Figure 9 and Figure 10 As shown, the pixel defining layer 2 further includes a second defining portion 24, which is located between two adjacent first defining portions 23. The first defining portions 23 and the second defining portion 24 cooperate to define the pixel opening area 21.

[0070] In this embodiment, the second defining portion 24 is located between two adjacent pixel opening regions 21, and the second defining portion 24 has a connecting channel 22 connecting the two adjacent pixel opening regions 21. No electrodes are provided on the substrate 1 corresponding to the aforementioned connecting channel 22, so that the pixel units formed by the two adjacent pixel opening regions 21 form a visual separation when emitting light. Based on this, the second defining portion 24 further structurally separates the two pixel opening regions 21, so that the two adjacent second defining portions 24 structurally define independent pixel units.

[0071] In one embodiment, see Figure 11 The height of the second defining portion 24 is less than the height of the first defining portion 23 relative to the substrate 1, thereby forming the connection channel 22. In this embodiment, when printing ink, the ink in the pixel column 2a can cover the second defining portion 24, that is, the ink in the pixel opening area 21 can directly cross the second defining portion 24 and enter the adjacent other pixel opening areas 21, enabling the simultaneous printing of two or more pixels, thereby reducing printing difficulty and improving printing resolution.

[0072] In another embodiment, the height of the second defining portion 24 relative to the substrate 1 is less than or equal to the height of the first defining portion 23, such as... Figure 12 As shown, in the extending direction of the pixel column 2a, a through hole is provided in the second defining portion 24, and the through hole constitutes the connecting channel 22. In this embodiment, the ink in the pixel opening area 21 can flow in the adjacent pixel opening area 21 at the beginning of printing, improving the flow efficiency.

[0073] In one embodiment, such as Figure 13 As shown, in the first direction D1, the width W7 of the second defining portion 24 is 0.1μm to 40μm, preferably 0.5μm to 30μm.

[0074] Optionally, the width W7 of the second defining portion 24 can be any one or any two of the following values: 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1μm, 2μm, 3μm, 4μm, 5μm, 10μm, 15μm, 20μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, 35μm, and 40μm.

[0075] In one embodiment, such as Figure 13 As shown, in the extending direction of the pixel column 2a, the length L2 of the second defining portion 24 is 10μm to 15μm, preferably 11μm to 14μm. The length of the second defining portion 24 needs to be within an appropriate range, that is, to effectively separate different pixel opening areas 21, and to ensure that the length of the connecting channel 22 is conducive to the flow of ink.

[0076] Optionally, the length L2 of the second defining portion 24 is any one or any two of 10μm, 11μm, 12μm, 13μm, 14μm, and 15μm.

[0077] In one embodiment, such as Figure 10 and Figure 11 As shown, relative to the substrate 1, the average height H2 of the second defining portion 24 is 0.1 μm to 0.5 μm, preferably, the average height H2 of the second defining portion 24 is 0.2 μm to 0.5 μm.

[0078] Optionally, the average height H2 of the second defining portion 24 can be any one or any two of 0.1μm, 0.2μm, 0.3μm, 0.4μm, and 0.5μm.

[0079] In one embodiment, such as Figure 5 As shown, within the area of ​​a single pixel opening region 21, the substrate 1 has a first electrode 11 and a second electrode 12 arranged side-by-side at positions corresponding to the pixel opening region 21, and as... Figure 8 As shown, no electrodes are provided on the substrate 1 at the position corresponding to the connection channel 22.

[0080] In this embodiment, the area of ​​a single pixel opening region 21 corresponds to two independent electrodes, and the pixel opening region 21 can be divided into two connected sub-pixel opening regions, specifically as follows: Figure 9The diagram illustrates a first sub-pixel opening region 211 and a second sub-pixel opening region 212. On the substrate 1, corresponding to the positions of the first sub-pixel opening region 211 and the second sub-pixel opening region 212, there are first electrodes 11 and second electrodes 12, separated by the first defining portion. However, no electrodes are provided in the area where the first sub-pixel opening region 211 and the second sub-pixel opening region 212 meet. Therefore, the pixel unit fabricated in the pixel opening region 21 can have two independent light-emitting regions, effectively turning one pixel into two pixels and improving pixel resolution. The first electrode 11 and the second electrode 12 can be either an anode or a cathode.

[0081] In this embodiment, no electrode is provided on the substrate 1 corresponding to the connection channel 22 between two adjacent pixel opening areas 21. After the two adjacent pixel opening areas 21 form a pixel unit, a visual gap is formed between the two pixel units when light is emitted.

[0082] In this embodiment, pixel column 2a is divided into two sub-pixel opening areas by a pixel opening area 21. Even if the printing device has low printing accuracy and no ink droplets are printed in some sub-pixel opening areas, the ink in the sub-pixel opening areas where ink droplets have been printed can still flow to other sub-pixel opening areas in the same pixel column 2a, so that each sub-pixel opening area can be filled with ink and a film can be effectively formed in each sub-pixel opening area. Two sub-pixels are formed in one pixel opening area 21, which can improve the printing resolution without increasing the printing accuracy of the printing device.

[0083] This application provides an inkjet printing method that can be used for inkjet printing on the aforementioned substrate. The method includes:

[0084] A substrate is provided, the substrate including a substrate and a pixel defining layer disposed on the substrate, the pixel defining layer defining a plurality of pixel columns, the pixel columns including a plurality of pixel opening regions;

[0085] The width of the widest part of at least one of the pixel opening regions in the pixel column is greater than or equal to the diameter of the ink droplet to be printed.

[0086] In this embodiment, for multiple pixel columns in the substrate, the width of the widest part of the pixel opening area in the pixel column is greater than or equal to the diameter of the ink droplet to be printed. This can prevent the ink droplet from overflowing into other pixel columns and prevent color mixing between pixel columns of different colors. This can improve the printing resolution and printing effect without improving the printing accuracy of the printing device.

[0087] In some embodiments, the method includes: the widest point of at least one pixel opening region in the pixel column is located in the middle of the pixel opening region. In this embodiment, during inkjet printing, the ink droplet is printed in the middle region of the pixel opening region and then spreads outwards from the middle region to the surrounding region, which is beneficial for forming a uniform film layer, as detailed in the above embodiment.

[0088] In some embodiments, the width of the widest point of the orthographic projection of at least one of the pixel opening regions in the pixel column onto the substrate is greater than or equal to the diameter of the ink droplet to be printed, as described in the above embodiments.

[0089] In some embodiments, a connecting channel is provided between two adjacent pixel opening areas in the pixel column, as described in the above embodiments.

[0090] In some embodiments, the width of the middle portion of the orthographic projection of at least one pixel opening region in the pixel column onto the substrate is greater than or equal to 1 μm. Printing at this position can completely accommodate the ink droplet, preventing ink droplet overflow and color mixing in pixel opening regions 21 of different colors. In this embodiment, the maximum diameter of the ink droplet is 1 μm to 50 μm, optionally, the maximum diameter of the ink droplet is 1 μm to 30 μm. The ink droplet diameter printed by the inkjet printer in this embodiment is within this range, which can meet the requirements of high-resolution displays. In this embodiment, the width of the widest part of the pixel opening region 21 is greater than the maximum diameter of the ink droplet, which can completely accommodate the printed ink droplet and prevent ink droplet mixing in pixel opening regions 21 of different colors, thus meeting the printing requirements of high-resolution displays.

[0091] In some embodiments, the width of the widest part of at least one pixel opening region in the pixel column is 1 μm to 50 μm; alternatively, the width of the widest part of at least one pixel opening region in the pixel column is 5 μm to 45 μm, as described in the above embodiments.

[0092] In some embodiments, the width of the middle portion of the orthogonal projection of at least one pixel opening region in the pixel column onto the substrate is 1 μm to 50 μm; alternatively, the width of the middle portion of the orthogonal projection of at least one pixel opening region in the pixel column onto the substrate is 5 μm to 45 μm, as described in the above embodiments.

[0093] This embodiment also provides a display panel, including a substrate printed using the inkjet printing method described above; or including the substrate shown in the above embodiment; in conjunction with the above... Figures 1 to 13 The substrate includes at least two pixel columns 2a. Pixel opening areas 21 within the same pixel column 2a are provided with pixels of the same color, while pixel opening areas 21 in adjacent pixel columns 2a are provided with pixels of different colors. Figure 14As shown in the figure, the red, blue, and green pixel columns are arranged sequentially, and the pixels in adjacent columns 2a are staggered, which can increase the density of the pixel opening area and make the light emission more uniform. The specific light emission diagram is as follows. Figure 15 As shown.

[0094] This embodiment also provides a display device, including a substrate printed using the inkjet printing method described above; or including the substrate described above; or including the display panel described above.

[0095] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. An inkjet printing method, characterized in that, The method includes: A substrate is provided, the substrate including a substrate and a pixel defining layer disposed on the substrate, the pixel defining layer defining a plurality of pixel columns, the pixel columns including a plurality of pixel opening regions; The width of the widest part of at least one of the pixel opening regions in the pixel column is greater than or equal to the diameter of the ink droplet to be printed.

2. The inkjet printing method according to claim 1, characterized in that, The method includes: the widest point of at least one pixel opening region in the pixel column is located in the middle of the pixel opening region; And / or, a connecting channel is provided between two adjacent pixel opening areas in the pixel column; And / or, the width of the widest part of the orthographic projection of at least one of the pixel opening regions in the pixel column onto the substrate is greater than or equal to the diameter of the ink droplet to be printed; And / or, the width of the widest part of at least one of the pixel opening regions in the pixel column is greater than or equal to 1 μm.

3. The inkjet printing method according to claim 2, characterized in that, The width of the middle portion of the orthographic projection of at least one of the pixel opening regions in the pixel column onto the substrate is greater than or equal to 1 μm; And / or, the width of the widest part of at least one of the pixel opening regions in the pixel column is 1 μm to 50 μm; optionally, the width of the widest part of at least one of the pixel opening regions in the pixel column is 5 μm to 45 μm; And / or, the width of the middle portion of the orthographic projection of at least one pixel opening region in the pixel column onto the substrate is 1 μm to 50 μm; optionally, the width of the middle portion of the orthographic projection of at least one pixel opening region in the pixel column onto the substrate is 5 μm to 45 μm; And / or, the maximum diameter of the ink droplet is 1μm to 50μm, optionally, the maximum diameter of the ink droplet is 1μm to 30μm.

4. A substrate, characterized in that, The substrate includes a substrate and a pixel defining layer disposed on the substrate, wherein: The pixel defining layer defines a plurality of pixel columns, each pixel column including a plurality of pixel opening regions, wherein the width of the widest part of at least one pixel opening region in the pixel column is greater than or equal to the diameter of the ink droplet to be printed; and / or, The pixel delineation layer defines a plurality of pixel columns, wherein at least two adjacent pixel columns each independently include alternating pixel opening regions and connecting channels, the connecting channels being used to connect two adjacent pixel opening regions in the pixel column, and in two adjacent pixel columns, the connecting channel of one pixel column is arranged side by side with the pixel opening region of the other pixel column.

5. The substrate according to claim 4, characterized in that, The widest point of at least one of the pixel opening regions in the pixel column is located in the middle of the pixel opening region; And / or, the width of the widest part of the orthographic projection of at least one of the pixel opening regions in the pixel column onto the substrate is greater than or equal to the diameter of the ink droplet to be printed; And / or, the width of the widest part of at least one of the pixel opening regions in the pixel column is greater than or equal to 1 μm; And / or, in two adjacent pixel columns, the connection channel of one pixel column has a first central cross-section perpendicular to the surface of the substrate, and the pixel opening area of ​​the other pixel column has a second central cross-section perpendicular to the surface of the substrate. The side-by-side arrangement satisfies that: the first central cross-section and the second central cross-section are coplanar or parallel, and the distance between the first central cross-section and the second central cross-section when they are parallel is less than a preset value.

6. The substrate according to claim 5, characterized in that, The width of the middle portion of the orthographic projection of at least one of the pixel opening regions in the pixel column onto the substrate is greater than or equal to 1 μm; And / or, at least one of the pixel opening regions in the pixel column has its orthographic projection on the substrate as a pattern that is wide in the middle and narrow at both ends; And / or, the graphic is an axisymmetric graphic; And / or, the orthographic projection of at least one of the pixel opening regions in the pixel column onto the substrate is circular, elliptical, or polygonal, the polygon including triangle, rectangle, rhombus, trapezoid, hexagon, octagon, or decagon; And / or, the preset value is 0.1μm to 4μm; optionally, the preset value is 0.1μm to 2μm.

7. The substrate according to claim 6, characterized in that, The width of the widest part of at least one of the pixel opening regions in the pixel column is 1 μm to 50 μm; optionally, the width of the widest part of at least one of the pixel opening regions in the pixel column is 5 μm to 45 μm. And / or, the width of the middle portion of the orthographic projection of at least one pixel opening region in the pixel column onto the substrate is 1 μm to 50 μm; optionally, the width of the middle portion of the orthographic projection of at least one pixel opening region in the pixel column onto the substrate is 5 μm to 45 μm; And / or, the length of the pixel opening region is 60μm to 140μm, and optionally, the length of the pixel opening region is 70μm to 100μm; And / or, the length of the connection channel is 10μm to 15μm, optionally, the length of the connection channel is 11μm to 14μm; And / or, the width of the connection channel is 0.1μm to 40μm, optionally, the width of the connection channel is 0.5μm to 30μm; And / or, the maximum diameter of the ink droplet is 1μm to 50μm, optionally, the maximum diameter of the ink droplet is 1μm to 30μm.

8. The substrate according to any one of claims 4 to 7, characterized in that, The pixel defining layer further includes a first defining portion located between two adjacent pixel columns; the orthographic projection of the first defining portion on the substrate extends in the extending direction of the pixel columns. And / or, the pixel defining layer further includes a second defining portion located between two adjacent pixel opening regions in the pixel column; the second defining portion has the connection channel; And / or, the substrate has a first electrode and a second electrode arranged side by side at the position corresponding to the pixel opening area, and no electrode is provided on the substrate at the position corresponding to the connection channel.

9. The substrate according to claim 8, characterized in that, The orthographic projection of the first defining portion on the substrate extends to form a wave shape, and in two adjacent first defining portions, the peak of the orthographic projection of one portion is arranged side by side with the trough of the orthographic projection of the other portion in a first direction. And / or, relative to the substrate, the height of the second defining portion is less than the height of the first defining portion.

10. The substrate according to claim 8 or 9, characterized in that, The width of the first defining portion is 10μm to 30μm; optionally, the width of the first defining portion is 15μm to 25μm. And / or, relative to the substrate, the average height of the first defining portion is 0.5 to 1 μm; optionally, the average height of the first defining portion is 0.6 to 1 μm; And / or, the length of the second defining portion is 10μm to 15μm, optionally, the length of the second defining portion is 11μm to 14μm; And / or, relative to the substrate, the average height of the second defining portion is 0.1 μm to 0.5 μm, optionally, the average height of the second defining portion is 0.2 μm to 0.5 μm; And / or, the width of the second defining portion is 0.1μm to 40μm, and optionally, the width of the connecting channel is 0.5μm to 30μm.

11. A display panel, characterized in that, Includes a substrate printed using the inkjet printing method according to any one of claims 1 to 3; Alternatively, it may include the substrate as described in any one of claims 4 to 10.

12. The display panel according to claim 11, characterized in that, The substrate includes at least two pixel columns; the pixel opening areas in the same pixel column are provided with pixels of the same color, and the pixel opening areas in two adjacent pixel columns are provided with pixels of different colors.

13. A display device, characterized in that, Including a substrate printed by the inkjet printing method according to any one of claims 1 to 3; Or it may include the substrate as described in any one of claims 4 to 10; Or it may include the display panel as described in claim 11 or 12.

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