Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises: a substrate; the sub-pixel groups are arranged on the substrate, sub-pixels in each sub-pixel group have the same light emitting color, the sub-pixel groups with different colors are separated by a first bank layer, each sub-pixel group comprises a plurality of sub-pixels, adjacent sub-pixels in the plurality of sub-pixels are separated by a second bank layer, and the sub-pixels in the plurality of sub-pixel groups are separated by the second bank layer. The height of the second bank layer in the direction perpendicular to the substrate is smaller than that of the first bank layer in the direction perpendicular to the substrate, and the second bank layer is adjacent to the first bank layer; an extension line of a midpoint of the second bank layer between two adjacent sub-pixels in the plurality of sub-pixels in the first direction does not coincide with at least one of extension lines of respective midpoints of the two sub-pixels in the first direction.

Description

Display substrate and display device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] In related technologies, pixel structures using high-resolution inkjet printing technology can improve the uniformity of film formation within pixels of high-resolution printed products. With a pixel bank structure, after printing, the ink within each column of same-color sub-pixels is separated from each other. With a line bank structure, after printing, the ink within each column of same-color sub-pixels is inter-connected, averaging the ink within each sub-pixel.

[0003] Summary of the Invention

[0004] According to one aspect of the present disclosure, a display substrate is provided, comprising: a base substrate; and a plurality of sub-pixel groups on the base substrate, the sub-pixels in each sub-pixel group having the same luminous color, and sub-pixel groups of different colors being separated by a first embankment layer, wherein: each sub-pixel group comprises a plurality of sub-pixels, adjacent sub-pixels among the plurality of sub-pixels are separated by a second embankment layer, wherein a height of the second embankment layer in a direction perpendicular to the base substrate is less than a height of the first embankment layer in a direction perpendicular to the base substrate, the second embankment layer is adjacent to the first embankment layer, and in each sub-pixel group, an extension line of a midpoint of the second embankment layer between two adjacent sub-pixels among the plurality of sub-pixels in the first direction does not coincide with at least one of an extension line of a respective midpoint of the two sub-pixels in the first direction.

[0005] In some embodiments, a width of at least one sub-pixel among the plurality of sub-pixels in a second direction is greater than a width of the second bank layer in the second direction, the second direction intersecting the first direction.

[0006] In some embodiments, the extension line of the midpoint of the second bank layer between two adjacent sub-pixels in the plurality of sub-pixels in the first direction is located between the extension lines of the respective midpoints of the two sub-pixels in the first direction, and the second direction intersects with the first direction.

[0007] In some embodiments, the first direction is a column direction of a sub-pixel array formed by the plurality of sub-pixel groups.

[0008] In some embodiments, the second direction is a row direction of a sub-pixel array formed by the plurality of sub-pixel groups.

[0009] In some embodiments, the extension shape of the first bank layer is a broken line shape or a wavy line shape.

[0010] In some embodiments, the display substrate includes a plurality of first bank layers, and extension directions of at least two first bank layers among the plurality of first bank layers are substantially parallel, and lengths of the at least two first bank layers are equal.

[0011] In some embodiments, the first embankment layer includes a first line portion and a second line portion, the first line portion and the second line portion are alternately distributed and connected as a whole, the extension directions of different first line portions in the first embankment layer are parallel, and the extension directions of different second line portions in the first embankment layer are parallel.

[0012] In some embodiments, the second line portion extends along the second direction; and the first line portion and the second line portion form a first angle.

[0013] In some embodiments, the first angle is not 90 degrees.

[0014] In some embodiments, a width of the first line portion in the second direction is equal to a width of the second line portion in the first direction.

[0015] In some embodiments, the second embankment layer includes a third line portion and a fourth line portion, the third line portion and the fourth line portion are alternately distributed, the extension directions of different third line portions in the second embankment layer are parallel, and the extension directions of different fourth line portions in the second embankment layer are parallel.

[0016] In some embodiments, the fourth line portion extends along the second direction; and the third line portion and the fourth line portion form a second angle.

[0017] In some embodiments, the second angle is not 90 degrees.

[0018] In some embodiments, a width of the third line portion in the second direction is equal to a width of the fourth line portion in the first direction.

[0019] In some embodiments, a width of the first bank layer in a direction perpendicular to an extension direction of the first bank layer is equal to a width of the second bank layer in a direction perpendicular to an extension direction of the second bank layer.

[0020] In some embodiments, the height of the first bank layer ranges from 1.2 micrometers to 1.8 micrometers; the height of the second bank layer ranges from 0.5 micrometers to 1 micrometer.

[0021] In some embodiments, a material of the first bank layer is the same as a material of the second bank layer, and the first bank layer and the second bank layer are connected as one.

[0022] In some embodiments, the multiple sub-pixel groups include: a red sub-pixel group, a blue sub-pixel group and a green sub-pixel group, wherein the area of ​​the red sub-pixels in the red sub-pixel group, the area of ​​the blue sub-pixels in the blue sub-pixel group and the area of ​​the green sub-pixels in the green sub-pixel group are all equal.

[0023] In some embodiments, the multiple sub-pixel groups include: a red sub-pixel group, a blue sub-pixel group, and a green sub-pixel group, wherein the area of ​​the blue sub-pixels in the blue sub-pixel group is larger than the area of ​​the red sub-pixels in the red sub-pixel group, and the area of ​​the blue sub-pixels in the blue sub-pixel group is larger than the area of ​​the green sub-pixels in the green sub-pixel group.

[0024] In some embodiments, the second bank layer includes a third line portion and a fourth line portion adjacent to the third line portion; each sub-pixel group includes at least three sub-pixels, the at least three sub-pixels including a first sub-pixel, a second sub-pixel adjacent to the first sub-pixel, and a third sub-pixel adjacent to the second sub-pixel, the first sub-pixel and the second sub-pixel are separated by the third line portion, and the second sub-pixel and the third sub-pixel are separated by the fourth line portion.

[0025] In some embodiments, the shape of each sub-pixel is a parallelogram or an ellipse; the first sub-pixel and the second sub-pixel are located in the same sub-pixel row, and the second sub-pixel and the third sub-pixel are located in different sub-pixel rows.

[0026] In some embodiments, the at least three sub-pixels include a plurality of sub-pixel rows, each sub-pixel row includes at least two sub-pixels, wherein in each sub-pixel group, the at least two sub-pixels in different sub-pixel rows are staggered.

[0027] In some embodiments, the shape of each sub-pixel is a diamond or a triangle; the first sub-pixel and the second sub-pixel are located in different sub-pixel rows, the second sub-pixel and the third sub-pixel are located in different sub-pixel rows, and the sub-pixel row where the second sub-pixel is located is between the sub-pixel row where the first sub-pixel is located and the sub-pixel row where the third sub-pixel is located.

[0028] In some embodiments, the shape of each sub-pixel is hexagonal or circular; in each sub-pixel group, the center of the first sub-pixel, the center of the second sub-pixel, and the center of the third sub-pixel are respectively located at different vertices of an equilateral triangle; the first sub-pixel and the third sub-pixel are separated by another third line portion or another fourth line portion.

[0029] According to another aspect of the present disclosure, a display device is provided, comprising: the display substrate as described above.

[0030] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0032] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0033] FIG1 is a top view showing a display substrate according to one embodiment of the present disclosure;

[0034] 2 is a schematic cross-sectional view showing a structure of a display substrate taken along line AA′ in FIG. 1 according to an embodiment of the present disclosure;

[0035] FIG3 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0036] FIG4 is an enlarged schematic diagram showing a partial structure of a display substrate according to another embodiment of the present disclosure;

[0037] FIG5 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0038] FIG6 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0039] FIG7 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0040] FIG8 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0041] FIG9 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0042] FIG10 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0043] FIG11 is a top view showing a display substrate according to another embodiment of the present disclosure;

[0044] FIG12 is a schematic diagram illustrating an elliptical sub-pixel according to one embodiment of the present disclosure;

[0045] FIG13 is a schematic diagram illustrating hexagonal sub-pixels according to one embodiment of the present disclosure;

[0046] FIG14A is a schematic diagram illustrating calculation of the area of ​​a sub-pixel according to one embodiment of the present disclosure;

[0047] FIG14B is a schematic diagram illustrating calculation of the area of ​​sub-pixels connected along their long axes according to one embodiment of the present disclosure;

[0048] FIG14C is a schematic diagram illustrating calculation of the area of ​​interlaced connected sub-pixels according to another embodiment of the present disclosure;

[0049] FIG. 15 is a schematic diagram illustrating a sub-pixel arrangement according to an embodiment of the present disclosure.

[0050] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not necessarily drawn according to actual proportional relationships. In addition, identical or similar reference numerals represent identical or similar components. DETAILED DESCRIPTION

[0051] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0052] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0053] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0054] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0055] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0056] The inventors of the present disclosure have discovered that, in the related art, when a high-resolution inkjet printing technology is used to form a pixel structure of a display substrate, the high-resolution inkjet printing technology may affect the resolution of the display substrate.

[0057] In view of this, embodiments of the present disclosure provide a display substrate to improve the resolution of the display substrate without affecting the display uniformity of the display substrate.

[0058] 1 is a top view of a display substrate according to an embodiment of the present disclosure. FIG2 is a schematic cross-sectional view showing a structure of a display substrate according to an embodiment of the present disclosure taken along line AA′ in FIG1 .

[0059] 1 and 2 , the display substrate includes a base substrate 10. For example, the base substrate is a flexible substrate or a rigid substrate.

[0060] As shown in FIG1 , the display substrate further includes a plurality of sub-pixel groups 20 on the base substrate 10. As shown in FIG1 , all sub-pixels within a dotted box constitute a sub-pixel group. For example, as shown in FIG1 , a plurality of red sub-pixels R in the same column (e.g., the first column) constitute a sub-pixel group 20, which can be referred to as the first sub-pixel group 2010, a plurality of green sub-pixels G in the same column (e.g., the second column) constitute another sub-pixel group 20, which can be referred to as the second sub-pixel group 2020, a plurality of blue sub-pixels B in the same column (e.g., the third column) constitute another sub-pixel group 20, which can be referred to as the third sub-pixel group 2030, and so on. The sub-pixels within each sub-pixel group 20 emit the same color. For example, as shown in FIG1 , the sub-pixels within one sub-pixel group (e.g., the first sub-pixel group described above) all emit red color, the sub-pixels within another sub-pixel group (e.g., the second sub-pixel group described above) all emit green color, and the sub-pixels within another sub-pixel group (e.g., the third sub-pixel group described above) all emit blue color. As shown in FIG. 1 , sub-pixel groups 20 of different colors are separated by a first bank layer 211 .

[0061] As shown in FIG1 , each subpixel group includes a plurality of subpixels 220. For example, the first subpixel group 2010 includes a plurality of red subpixels R, the second subpixel group 2020 includes a plurality of green subpixels G, and the third subpixel group 2030 includes a plurality of blue subpixels B. Adjacent subpixels in the plurality of subpixels are separated by a second bank layer 212. As shown in FIG2 , the height H2 of the second bank layer 212 in a direction perpendicular to the substrate 10 is less than the height H1 of the first bank layer 211 in a direction perpendicular to the substrate 10. For example, the height H1 of the first bank layer 211 ranges from 1.2 microns to 1.8 microns. For example, the height H2 of the second bank layer 212 ranges from 0.5 microns to 1 micron.

[0062] 1 , the second bank 212 is adjacent to the first bank 211 , so that the portion of the second bank 212 that is retracted along the second direction is replaced by the first bank 211 .

[0063] As shown in FIG1 , in each subpixel group 20, an extension line of the midpoint of the second bank between two adjacent subpixels in the plurality of subpixels in the first direction does not overlap with at least one of the extension lines of the midpoints of the two subpixels in the first direction. For example, an extension line 2121 of the midpoint 2120 of the second bank between two adjacent subpixels in the plurality of subpixels R in the first subpixel group 2010 in the first direction 101 does not overlap with an extension line 2202 of the midpoint 2201 of one subpixel in the first direction 101, and an extension line 2121 of the midpoint 2120 of the second bank 212 in the first direction 101 does not overlap with an extension line 2204 of the midpoint 2203 of another subpixel in the first direction 101. Of course, those skilled in the art can understand from the above description that the extension line 2121 of the midpoint 2120 of the second embankment layer 212 in the first direction 101 may not coincide with one of the extension line 2202 of the midpoint 2201 of one sub-pixel in the first direction 101 and the extension line 2204 of the midpoint 2203 of another sub-pixel in the first direction 101.

[0064] Thus, a display substrate according to an embodiment of the present disclosure is provided. The display substrate comprises: a base substrate; and a plurality of sub-pixel groups on the base substrate, wherein the sub-pixels within each sub-pixel group emit the same luminous color, and sub-pixel groups of different colors are separated by a first bank layer, wherein: each sub-pixel group comprises a plurality of sub-pixels, adjacent sub-pixels in the plurality of sub-pixels are separated by a second bank layer, wherein the height of the second bank layer in a direction perpendicular to the base substrate is less than the height of the first bank layer in a direction perpendicular to the base substrate; and in each sub-pixel group, an extension line of the midpoint of the second bank layer between two adjacent sub-pixels in the plurality of sub-pixels in the first direction does not overlap with at least one of the extension lines of the midpoints of the two sub-pixels in the first direction. In this embodiment, since in each sub-pixel group, the extension line of the midpoint of the second bank layer between two adjacent sub-pixels in the multiple sub-pixels in the first direction does not coincide with at least one of the extension lines of the respective midpoints of the two sub-pixels in the first direction, in the process of forming the pixel structure of the display substrate using inkjet printing technology, the ink used can flow into the openings of different sub-pixels in the same sub-pixel group as evenly as possible, and be separated as much as possible by different first bank layers and second bank layers, so that different sub-pixels can be prevented from affecting each other as much as possible, thereby improving the resolution of the display substrate without affecting the uniformity of the display substrate.

[0065] In some embodiments, as shown in FIG1 , in each subpixel group 20, the width W1 of at least one of the plurality of subpixels in the second direction 102 is greater than the width W2 of the second bank 212 in the second direction 102. For example, the width W1 of the subpixel R in the first subpixel group 2010 is greater than the width W2 of the second bank 212. In this way, the portion of the second bank that is retracted along the first direction is replaced by the portion of the adjacent first bank. Therefore, when forming the pixel structure of the display substrate using inkjet printing technology, the ink used can flow as evenly as possible into the openings of different subpixels within the same subpixel group and be separated as much as possible by the different first and second bank layers. This can minimize the interference between different subpixels, thereby improving the resolution of the display substrate without affecting the uniformity of the display substrate.

[0066] As shown in FIG1 , the second direction 102 intersects the first direction 101. For example, the second direction 102 is perpendicular to the first direction 101. For example, the first direction 101 is the column direction of the sub-pixel array composed of the multiple sub-pixel groups, and the second direction 102 is the row direction of the sub-pixel array composed of the multiple sub-pixel groups.

[0067] 2 , the display substrate further includes an electrode layer 230 , at least a portion of which is exposed by the sub-pixel opening 260 . For example, the electrode layer 230 is an anode layer.

[0068] In some embodiments, as shown in FIG2 , the display substrate further includes a first film layer 240 on the electrode layer 230. For example, the first film layer 240 includes a hole injection layer, a hole transport layer, and a light-emitting layer. For example, the first film layer is formed using a printing process.

[0069] In some embodiments, as shown in FIG2 , the display substrate further includes a second film layer 250 covering the first bank layer 211, the second bank layer 212, and the first film layer 240. For example, the second film layer 250 includes an electron transport layer, an electron injection layer, and another electrode layer (e.g., a cathode layer). For example, the second film layer is formed using an evaporation process, and thus, the second film layer is formed over the entire surface.

[0070] The inventors of the present disclosure have also discovered that, for a display substrate in the related art, when a pixel structure is prepared by an inkjet printing process, the luminous uniformity of the sub-pixels may be low.

[0071] In view of this, embodiments of the present disclosure further provide another display substrate to improve the light emission uniformity and pixel aperture ratio of sub-pixels.

[0072] Fig. 3 is a top view of a display substrate according to another embodiment of the present disclosure. Fig. 4 is an enlarged schematic diagram showing a partial structure of a display substrate according to another embodiment of the present disclosure.

[0073] As shown in FIG3 , the display substrate includes: a base substrate (not shown in FIG3 ) and a plurality of sub-pixel groups 20 on the base substrate. The base substrate is the same as or similar to the base substrate 10 in FIG1 . Similar to the display substrate shown in FIG1 , in the display substrate shown in FIG3 , the sub-pixels in each sub-pixel group 20 emit the same color, and sub-pixel groups of different colors are separated by a first bank layer 211 . Each sub-pixel group 20 includes a plurality of sub-pixels, and adjacent sub-pixels in the plurality of sub-pixels are separated by a second bank layer 212 , wherein the height of the second bank layer 212 in a direction perpendicular to the base substrate is less than the height of the first bank layer 211 in a direction perpendicular to the base substrate; in each sub-pixel group, an extension line of the midpoint of the second bank layer between two adjacent sub-pixels in the plurality of sub-pixels in the first direction does not overlap with at least one of the extension lines of the midpoints of the two sub-pixels in the first direction.

[0074] In some embodiments, an extension line of the midpoint of the second bank layer between two adjacent sub-pixels in the plurality of sub-pixels in the first direction is located between extension lines of the respective midpoints of the two sub-pixels in the first direction, and the second direction intersects the first direction.

[0075] For example, as shown in FIG3 , taking a first subpixel group 2010 including a plurality of red subpixels R as an example, in the first subpixel group 2010, an extension line 2121 of a midpoint 2120 of the second bank layer between two adjacent subpixels 222 and 223 (described later) in the plurality of subpixels in the first direction 101 is located between an extension line 2202 of a midpoint 2201 of one of the two subpixels in the first direction 101 and an extension line 2204 of a midpoint 2203 of the other of the two subpixels in the first direction 101. In this way, when fabricating a pixel structure using an inkjet printing process, ink can be distributed as evenly as possible among the subpixels within each subpixel group, thereby improving the uniformity of subpixel light emission.

[0076] As shown in Figure 3, the shape of each sub-pixel 220 is a parallelogram. It should be noted that, in the description of the embodiments of the present disclosure, the shape of the sub-pixel is the shape of the opening of the sub-pixel. Therefore, in this embodiment, the shape of the opening of each sub-pixel 220 is a parallelogram. In other words, the pixel definition pattern of the pixel definition layer is a parallelogram. Each sub-pixel group includes at least three sub-pixels. For example, the at least three sub-pixels include a first sub-pixel 221, a second sub-pixel 222, and a third sub-pixel 223. The first sub-pixel 221 and the second sub-pixel 222 are located in the same sub-pixel row, and the second sub-pixel 222 and the third sub-pixel 223 are located in different sub-pixel rows. It should be noted that each sub-pixel row is composed of a row of sub-pixels arranged along the second direction 102 (i.e., the row direction). As shown in Figure 4, each sub-pixel has a major axis direction 103 and a minor axis direction 104. The minor axis direction 104 is parallel to the second direction 102.

[0077] In this embodiment, the sub-pixels are arranged such that within each sub-pixel group, the sub-pixels are staggered along their major and minor axes. This maximizes pixel uniformity, thereby improving sub-pixel luminous uniformity and pixel aperture ratio. This design also enhances film uniformity along the major axis.

[0078] In some embodiments, the at least three sub-pixels in each sub-pixel group include a plurality of sub-pixel rows (for example, two sub-pixel rows or more sub-pixel rows). As shown in Figure 3, each sub-pixel row includes at least two sub-pixels. For example, the first sub-pixel row in the first row includes a first sub-pixel 221 and a second sub-pixel 222. In each sub-pixel group, the at least two sub-pixels in different sub-pixel rows are staggered. For example, as shown in Figure 3, the sub-pixel row where the first sub-pixel 221 is located (i.e., the first sub-pixel row) and the sub-pixel row where the third sub-pixel 223 is located (which may be referred to as the second sub-pixel row) are staggered. This way of staggering the sub-pixels is beneficial to improving the luminous uniformity and pixel aperture ratio of the sub-pixels.

[0079] Of course, those skilled in the art will appreciate that each sub-pixel row in each sub-pixel group may also include one sub-pixel, and that different sub-pixel rows in each sub-pixel group are staggered. For example, as shown in FIG15 , the red sub-pixels R in one sub-pixel group are staggered, the green sub-pixels G in another sub-pixel group are staggered, and the blue sub-pixels B in another sub-pixel group are staggered. FIG15 also shows data lines 1510 for transmitting data (e.g., data R for red sub-pixels, data G for green sub-pixels, or data B for blue sub-pixels).

[0080] As shown in FIG3 , the first bank layer 211 extends in a zigzag or wavy shape, thereby improving the uniformity of light emission without affecting the resolution of the display substrate.

[0081] In some embodiments, as shown in FIG3 , the display substrate includes a plurality of first bank layers 211. At least two of the plurality of first bank layers (e.g., first bank layers 211a and 211b on either side of a subpixel group) extend in substantially parallel directions and have equal lengths. This neatly separates the different subpixel groups, thereby improving the uniformity of light emission across the display substrate.

[0082] In some embodiments, as shown in Figures 3 and 4, the first bank layer 211 includes first line portions 301 and second line portions 302. The first line portions 301 and second line portions 302 are alternately distributed and connected as a whole. The extension directions of different first line portions 301 in the first bank layer 211 are parallel, and the extension directions of different second line portions 302 in the first bank layer 211 are parallel. For example, the first bank layer 211 includes multiple first line portions 301 and multiple second line portions 302, and within the same first bank layer 211, the extension directions of the multiple first line portions 301 are mutually parallel, and the extension directions of the multiple second line portions 302 are mutually parallel. This helps improve the uniformity of light emission across the entire display substrate.

[0083] In some embodiments, as shown in Figures 3 and 4, the extension directions of different first line portions 301 in different first bank layers 211 are parallel, and the extension directions of different second line portions 302 in different first bank layers 211 are parallel. This helps further improve the overall light uniformity of the display substrate.

[0084] In some embodiments, as shown in Figures 3 and 4, the second line portion 302 of the first bank layer 211 extends along the second direction 102. The first line portion 301 and the second line portion 302 form a first angle α. In some embodiments, the first angle α is not 90 degrees. For example, the first angle α is an obtuse angle. This facilitates designing each sub-pixel in the sub-pixel group as a parallelogram, thereby arranging the sub-pixels in a staggered arrangement along the major axis and the minor axis, thereby facilitating improved luminous uniformity and pixel aperture ratio of the sub-pixels.

[0085] In some embodiments, as shown in FIG4 , the width W3 of the first line portion 301 in the second direction 102 is equal to the width W4 of the second line portion 302 in the first direction 101. This makes the distances between adjacent sub-pixel groups equal, so that the sub-pixel groups are arranged at equal intervals, thereby improving the uniformity of light emission of the sub-pixels.

[0086] Furthermore, the equidistant design of the above-mentioned sub-pixel groups is also beneficial to improving the uniformity during the implementation of the inkjet printing process, thereby facilitating the control of the printing frequency of the printer during the inkjet printing process, improving the stability and speed of inkjet printing, and being beneficial to the mass production of inkjet printing products, thereby meeting the needs of high-pixel-density products as much as possible. In addition, the equidistant design of the above-mentioned sub-pixel groups can also improve the tolerance of ink droplet landing point errors, which is suitable for high-PPI printing and improves the PPI of the display substrate. Here, PPI (Pixels Per Inch) is also called the pixel density unit, which indicates the number of pixels per inch.

[0087] Of course, those skilled in the art will appreciate that the width W3 of the first line portion 301 in the second direction 102 may not be equal to the width W4 of the second line portion 302 in the first direction 101 . Therefore, the scope of the present disclosure is not limited thereto.

[0088] In some embodiments, as shown in Figures 3 and 4, the second bank layer 212 includes third line portions 303 and fourth line portions 304. The third line portions 303 and fourth line portions 304 are arranged alternately. The extension directions of different third line portions 303 in the second bank layer 212 are parallel, and the extension directions of different fourth line portions 304 in the second bank layer 212 are parallel. For example, the second bank layer 212 includes multiple third line portions 303 and multiple fourth line portions 304, and within the same first bank layer 211, the extension directions of the multiple first line portions 301 are parallel to each other, and the extension directions of the multiple second line portions 302 are parallel to each other. This helps improve the uniformity of light emission and the aperture ratio of the sub-pixels.

[0089] In some embodiments, as shown in Figures 3 and 4, different third line portions 303 in different second bank layers 212 extend in parallel directions, and different fourth line portions 304 in different second bank layers 212 extend in parallel directions. This helps further improve the light uniformity and aperture ratio of the sub-pixels.

[0090] In some embodiments, as shown in Figures 3 and 4, the fourth line portion 304 of the second bank layer 212 extends along the second direction 102. The third line portion 303 and the fourth line portion 304 form a second angle β. In some embodiments, the second angle β is not 90 degrees. For example, the second angle β is an obtuse angle. This is conducive to designing each sub-pixel in the sub-pixel group into a parallelogram, and then arranging them in a staggered arrangement in the long axis direction and the short axis direction, which is conducive to improving the luminous uniformity and pixel aperture ratio of the sub-pixels.

[0091] In some embodiments, as described above, the shape of each sub-pixel 220 may be a parallelogram, and accordingly, the first angle α may be equal to the second angle β.

[0092] In some embodiments, as shown in FIG4 , the width W5 of the third line portion 303 in the second direction 102 is equal to the width W6 of the fourth line portion 304 in the first direction 101. This makes the distances between the sub-pixels equal, so that the sub-pixels are arranged at equal intervals, thereby improving the uniformity of the light emission of the sub-pixels.

[0093] Furthermore, the equidistant sub-pixel spacing design also helps improve uniformity during inkjet printing, thereby facilitating control of the printer's printing frequency, improving the stability and speed of inkjet printing, and facilitating mass production of inkjet-printed products, thereby minimizing the demand for high-pixel-density products. Furthermore, the equidistant sub-pixel design also improves tolerance to ink droplet landing errors, making it suitable for high-PPI printing and increasing the PPI of display substrates.

[0094] Of course, those skilled in the art will appreciate that the width W5 of the third line portion 303 in the second direction 102 may not be equal to the width W6 of the fourth line portion 304 in the first direction 101. For example, the width W5 of the third line portion 303 in the second direction 102 may be smaller than the width W6 of the fourth line portion 304 in the first direction 101. Therefore, the scope of the present disclosure is not limited thereto.

[0095] In some embodiments, as shown in FIG4 , the width of the first bank 211 in a direction perpendicular to the extension of the first bank 211 (e.g., width W3 and / or W4) is equal to the width of the second bank 212 in a direction perpendicular to the extension of the second bank 212 (e.g., width W5 and / or W6). In other words, the width W3 of the first line portion 301, the width W4 of the second line portion 302, the width W5 of the third line portion 303, and the width W6 of the fourth line portion 304 are all equal. This ensures that the distances between adjacent sub-pixels on the display substrate are equal, allowing the sub-pixels to be arranged at equal intervals. This ensures that the microenvironments on both sides of the pixel opening are as similar as possible, improving the atmosphere consistency during the inkjet printing process, further facilitating film formation uniformity, and thus improving the luminous uniformity of the sub-pixels on the display substrate.

[0096] Moreover, the equal spacing design of each sub-pixel is also conducive to improving the uniformity of the inkjet printing process, which is beneficial to the control of the printer's printing frequency during the inkjet printing process, improving the stability and speed of inkjet printing, and is beneficial to the mass production of inkjet printing products, thereby meeting the needs of high-pixel density products as much as possible.

[0097] In some embodiments, as shown in Figures 3 and 4, the fourth line portion 304 is adjacent to the third line portion 303. That is, the second bank layer 212 includes the third line portion 303 and the fourth line portion 304 adjacent to the third line portion 303. Each subpixel group includes at least three subpixels. The at least three subpixels include a first subpixel 221, a second subpixel 222 adjacent to the first subpixel 221, and a third subpixel 223 adjacent to the second subpixel 222. The first subpixel 221 is separated from the second subpixel 222 by the third line portion 303, and the second subpixel 222 is separated from the third subpixel 223 by the fourth line portion 304. For example, as shown in Figures 3 and 4, the first subpixel 221 and the second subpixel 222 are arranged along the second direction 102, and the second subpixel 222 and the third subpixel 223 are arranged along the extending direction of the first line portion 301 of the first bank layer 211.

[0098] By arranging the sub-pixels as described above, the connection length of the sub-pixels can be made longer and the uniformity of the sub-pixels can be improved.

[0099] Since the printer can print at a rotational angle and can print at different positions by editing pixel patterns, and since the printer's print head is a multi-column (eg, three-column) parallel array, the corresponding print pattern is also a parallel array.

[0100] In some embodiments, the material of the first bank layer 211 is the same as that of the second bank layer 212, and the first bank layer 211 and the second bank layer 212 are connected as a whole. This allows for clearer distinction between the openings of the sub-pixels formed by the first bank layer and the second bank layer, thereby improving the resolution of the display substrate. In addition, this embodiment facilitates the manufacture of the first and second bank layers, thereby facilitating the manufacture of the display substrate and reducing manufacturing costs.

[0101] In some embodiments, a halftone mask can be used for exposure and development during the formation of the first and second bank layers. Although the first and second bank layers have different heights, the halftone mask can be used to perform a single exposure and development process to form the first and second bank layers.

[0102] Here, the halftone mask refers to a mask where the light transmittance at different positions on the mask is inconsistent. For example, if the light transmittance at the full-tone position is 0%, then for the positive photoresist material, some glue will remain below the full-tone position; the transmittance T at the half-tone position is 0% < T < 100%. The transmittance at the corresponding half-tone position can be determined based on the film thickness at the half-tone position. In this process, the glue here is a half-tone type, and since it is used for printing substrates, the glue can also have surface liquid-repellent properties. The specific process steps of the glue include: coating → pre-baking → exposure → development → post-baking → UV (Ultra Violet) irradiation.

[0103] For example, a line bank substrate can be formed by a line bank process using a halftone mask for one exposure, an upper black matrix can be manufactured on an upper cover plate, and then a QD (Quantum Dot) conversion layer structure can be formed by lamination.

[0104] In some embodiments, the plurality of sub-pixel groups include: a red sub-pixel group, a blue sub-pixel group, and a green sub-pixel group, wherein the area of ​​the red sub-pixels in the red sub-pixel group, the area of ​​the blue sub-pixels in the blue sub-pixel group, and the area of ​​the green sub-pixels in the green sub-pixel group are all equal. The same pixel area can effectively improve printing efficiency, and the setting of the printing template can be greatly simplified, simplifying the printing process, improving printing efficiency, and optimizing the arrangement of pixels. Here, the printing efficiency of sub-pixels of different colors can be adjusted by different film thicknesses.

[0105] In other embodiments, the plurality of sub-pixel groups include: a red sub-pixel group, a blue sub-pixel group, and a green sub-pixel group, wherein the area of ​​the blue sub-pixels in the blue sub-pixel group is larger than the area of ​​the red sub-pixels in the red sub-pixel group, and the area of ​​the blue sub-pixels in the blue sub-pixel group is larger than the area of ​​the green sub-pixels in the green sub-pixel group. The area of ​​the red sub-pixels in the red sub-pixel group may be equal to or different from the area of ​​the green sub-pixels in the green sub-pixel group. In this embodiment, by increasing the area of ​​the blue sub-pixels, the problem of the low lifespan of the blue sub-pixels can be compensated, thereby improving the overall lifespan of the display substrate.

[0106] In the embodiments of the present disclosure, improvements to the pixel-defining layers (i.e., the first and second bank layers) make them more suitable for the production of organic light-emitting devices using inkjet printing. During the manufacturing process, this design can improve the uniformity of ink film formation within the pixel and enhance the accuracy of ink droplet placement.

[0107] The above describes the arrangement of sub-pixels using the shape of each sub-pixel as a parallelogram as an example. Of course, the scope of the present disclosure is not limited to this. The display substrate of the embodiment of the present disclosure can also adopt other sub-pixel shapes. The shapes of the sub-pixels in other embodiments are described in detail below with reference to the accompanying drawings.

[0108] FIG. 5 is a top plan view illustrating a display substrate according to another embodiment of the present disclosure.

[0109] In the display substrate shown in FIG5 , each subpixel 220 is shaped like a diamond. FIG5 shows a first bank 211 and a second bank 212. The second bank 212 includes a third line portion 303 and a fourth line portion 304 adjacent to the third line portion 303. For example, as shown in FIG5 , each subpixel group includes a first subpixel 221, a second subpixel 222, and a third subpixel 223. As shown in FIG5 , the first subpixel 221 and the second subpixel 222 are located in different subpixel rows, and the second subpixel 222 and the third subpixel 223 are located in different subpixel rows. The subpixel row 522 in which the second subpixel 222 is located is located between the subpixel row 521 in which the first subpixel 221 is located and the subpixel row 523 in which the third subpixel 223 is located.

[0110] In the display substrate of this embodiment, the diamond-shaped sub-pixels are arranged into sub-pixel groups in the above-mentioned arrangement, which is beneficial to improving the luminous uniformity and pixel aperture ratio of the sub-pixels and is also beneficial to improving the resolution of the display substrate.

[0111] FIG. 6 is a top plan view illustrating a display substrate according to another embodiment of the present disclosure.

[0112] In the display substrate shown in FIG6 , each subpixel 220 is hexagonal (e.g., a regular hexagon). FIG6 shows a first bank 211 and a second bank 212, with the second bank 212 including a third line portion 303 and a fourth line portion 304 adjacent to the third line portion 303. For example, as shown in FIG6 , each subpixel group includes a first subpixel 221, a second subpixel 222, and a third subpixel 223. In each subpixel group, the center of the first subpixel 221, the center of the second subpixel 222, and the center of the third subpixel 223 are located at different vertices of an equilateral triangle 601. In other words, the lines connecting the centers of the first subpixel 221, the second subpixel 222, and the third subpixel 223 form an equilateral triangle 601. The first subpixel 221 and the third subpixel 223 are separated by another third line portion 303' or another fourth line portion 304'. That is, the opening of the first subpixel 221, the opening of the second subpixel 222 and the opening of the third subpixel 223 are separated by the third line portion 303, the fourth line portion 304 and another line portion (which can be regarded as another third line portion or another fourth line portion) 303' or 304'.

[0113] In the display substrate of this embodiment, the above-mentioned arrangement method (which can be called a honeycomb arrangement method) is used to organize hexagonal sub-pixels into sub-pixel groups, which is beneficial to improving the luminous uniformity and pixel aperture ratio of the sub-pixels, and is also beneficial to improving the resolution of the display substrate.

[0114] FIG. 7 is a top plan view illustrating a display substrate according to another embodiment of the present disclosure.

[0115] The arrangement of the sub-pixels in Figure 7 is similar to that in Figure 6. Unlike the display substrate shown in Figure 6, the sub-pixels in the display substrate shown in Figure 7 are circular in shape.

[0116] That is, in the display substrate shown in FIG7 , each subpixel 220 has a circular shape. FIG7 shows a first bank 211 and a second bank 212, with the second bank 212 including a third line portion 303 and a fourth line portion 304 adjacent to the third line portion 303. For example, as shown in FIG7 , each subpixel group includes a first subpixel 221, a second subpixel 222, and a third subpixel 223. In each subpixel group, the center of the first subpixel 221, the center of the second subpixel 222, and the center of the third subpixel 223 are located at different vertices of an equilateral triangle 701. In other words, the lines connecting the centers of the first subpixel 221, the second subpixel 222, and the third subpixel 223 form an equilateral triangle 701. The first subpixel 221 and the third subpixel 223 are separated by another third line portion 303' or another fourth line portion 304'. That is, the opening of the first subpixel 221, the opening of the second subpixel 222 and the opening of the third subpixel 223 are separated by the third line portion 303, the fourth line portion 304 and another line portion (which can be regarded as another third line portion or another fourth line portion) 303' or 304'.

[0117] In the display substrate of this embodiment, the circular sub-pixels are grouped into sub-pixel groups using the above-mentioned arrangement method (which can be called a plum blossom array arrangement method), which is beneficial to improving the luminous uniformity and pixel aperture ratio of the sub-pixels, and is also beneficial to improving the resolution of the display substrate.

[0118] FIG. 8 is a top plan view illustrating a display substrate according to another embodiment of the present disclosure.

[0119] In the display substrate shown in FIG8 , each sub-pixel 220 is in the shape of a square. A square can be regarded as a special rhombus, and accordingly, the arrangement of the sub-pixels shown in FIG8 is similar to the arrangement of the sub-pixels shown in FIG5 . FIG8 shows a first bank layer 211 and a second bank layer 212, and the second bank layer 212 includes a third line portion 303 and a fourth line portion 304 adjacent to the third line portion 303. For example, as shown in FIG8 , each sub-pixel group includes a first sub-pixel 221, a second sub-pixel 222, and a third sub-pixel 223. As shown in FIG8 , the first sub-pixel 221 and the second sub-pixel 222 are located in different sub-pixel rows, the second sub-pixel 222 and the third sub-pixel 223 are located in different sub-pixel rows, and the sub-pixel row where the second sub-pixel 222 is located is located between the sub-pixel row where the first sub-pixel 221 is located and the sub-pixel row where the third sub-pixel 223 is located.

[0120] In the display substrate of this embodiment, the square sub-pixels are arranged into sub-pixel groups in the above-mentioned arrangement manner, which is beneficial to improving the luminous uniformity and pixel aperture ratio of the sub-pixels and is also beneficial to improving the resolution of the display substrate.

[0121] FIG. 9 is a top plan view illustrating a display substrate according to another embodiment of the present disclosure.

[0122] In the display substrate shown in FIG9 , each sub-pixel 220 is in the shape of a square. FIG9 shows another arrangement of square sub-pixels. For example, as shown in FIG9 , each sub-pixel group includes a first sub-pixel 221, a second sub-pixel 222, and a third sub-pixel 223. As shown in FIG9 , the first sub-pixel 221 and the second sub-pixel 222 are located in the same sub-pixel row, and the second sub-pixel 222 and the third sub-pixel 223 are located in different sub-pixel rows. FIG9 shows a first bank layer 211 and a second bank layer 212, and the second bank layer 212 includes a third line portion 303 and a fourth line portion 304 adjacent to the third line portion 303. As shown in FIG9 , the length of the third line portion 303 along the first direction 101 and the length of the fourth line portion 304 along the second direction 102 are both equal to the side length of each square sub-pixel 220.

[0123] In the display substrate of this embodiment, FIG9 shows another arrangement of square sub-pixels. This arrangement is used to group the square sub-pixels into sub-pixel groups, which is beneficial to improving the luminous uniformity and pixel aperture ratio of the sub-pixels, and is also beneficial to improving the resolution of the display substrate.

[0124] FIG. 10 is a top plan view illustrating a display substrate according to another embodiment of the present disclosure.

[0125] In the display substrate shown in FIG10 , each sub-pixel 220 is shaped like a triangle (e.g., an equilateral triangle). FIG10 shows a first bank 211 and a second bank 212, wherein the second bank 212 includes a third line portion 303 and a fourth line portion 304 adjacent to the third line portion 303. For example, as shown in FIG10 , each sub-pixel group includes a first sub-pixel 221, a second sub-pixel 222, and a third sub-pixel 223. As shown in FIG10 , the first sub-pixel 221 and the second sub-pixel 222 are located in different sub-pixel rows, and the second sub-pixel 222 and the third sub-pixel 223 are located in different sub-pixel rows, and the sub-pixel row where the second sub-pixel 222 is located is located between the sub-pixel row where the first sub-pixel 221 is located and the sub-pixel row where the third sub-pixel 223 is located.

[0126] In some embodiments, as shown in FIG10 , each subpixel group further includes a fourth subpixel 224. The subpixel row where the fourth subpixel 224 is located is located on a side of the subpixel row where the third subpixel 223 is located that is away from the subpixel row where the second subpixel 222 is located. In other words, the subpixel row where the third subpixel 223 is located is located between the subpixel row where the second subpixel 222 is located and the subpixel row where the fourth subpixel 224 is located.

[0127] In the display substrate of this embodiment, the triangular sub-pixels are arranged into sub-pixel groups in the above-mentioned arrangement manner, which is beneficial to improving the luminous uniformity and pixel aperture ratio of the sub-pixels and is also beneficial to improving the resolution of the display substrate.

[0128] FIG. 11 is a top plan view illustrating a display substrate according to another embodiment of the present disclosure.

[0129] As shown in FIG11 , each sub-pixel 220 is shaped like an elongated strip with rounded corners. Each sub-pixel group includes a first sub-pixel 221, a second sub-pixel 222, and a third sub-pixel 223. The first sub-pixel 221 and the second sub-pixel 222 are located in the same sub-pixel row, while the second sub-pixel 222 and the third sub-pixel 223 are located in different sub-pixel rows. FIG11 shows a first bank 211 and a second bank 212. The second bank 212 includes a third line portion 303 and a fourth line portion 304 adjacent to the third line portion 303. As shown in FIG11 , the length of the third line portion 303 along the first direction 101 is less than the length of the second sub-pixel 222 along the first direction 101, and the length of the fourth line portion 304 along the second direction 102 is less than the length of the second sub-pixel 222 along the second direction 102. In other words, the third line portion 303 is indented inward relative to the second sub-pixel 222, and the fourth line portion 304 is indented inward relative to the second sub-pixel 222. Such a design is beneficial to improving the resolution of the display substrate, and is beneficial to improving the luminous uniformity of the sub-pixels and the pixel aperture ratio.

[0130] FIG12 is a schematic diagram illustrating an elliptical sub-pixel according to one embodiment of the present disclosure. As shown in FIG12 , sub-pixel 220 is elliptical. In other embodiments, sub-pixel 220 may be half an ellipse, for example, half an ellipse as cut along line 910 in FIG12 .

[0131] Fig. 13 is a schematic diagram illustrating a hexagonal sub-pixel according to one embodiment of the present disclosure. The sub-pixel shown in Fig. 13 is also hexagonal, but the hexagon is not a regular hexagon.

[0132] It should be noted that the shapes of the sub-pixels in the various embodiments described above are merely exemplary. In practice, the shapes of the sub-pixels may also be other shapes, for example, the shape of the sub-pixels may also be an octagon, etc. Therefore, the scope of the present disclosure is not limited thereto.

[0133] In some embodiments of the present disclosure, all sub-pixels in a display substrate may be parallel and center-aligned, which facilitates frequency and algorithm control of the printer during the inkjet printing process.

[0134] FIG. 14A is a schematic diagram illustrating calculation of the area of ​​a sub-pixel according to an embodiment of the present disclosure.

[0135] FIG. 14A shows the length L1 of the long axis direction and the length L2 of the short axis direction of the sub-pixel 220. S The area uniformity of the sub-pixel = U(L1)*U(L S ), where U(L1) represents the uniformity value of the sub-pixel in the long axis direction, and the uniformity value U(L1) is the percentage of the length of the uniformly luminous portion of the sub-pixel in the long axis direction to the length L1 of the sub-pixel in the long axis direction. The uniformity value is measured by a white light interferometer or other equipment. U(L S ) represents the uniformity value of the sub-pixel in the short axis direction, and the uniformity value U(L S ) is the length of the uniformly luminous portion of the sub-pixel in the short axis direction, which accounts for the length of the sub-pixel in the short axis direction L S The uniformity is measured as a percentage of the film thickness. This uniformity is measured using a white light interferometer or other equipment. Area uniformity is a percentage. This area uniformity also reflects the uniformity of the film thickness within a certain area (especially within the area of ​​the light-emitting pixel).

[0136] FIG14B is a schematic diagram illustrating calculation of the areas of sub-pixels connected along their long axes according to an embodiment of the present disclosure.

[0137] As shown in FIG14B , the long axis directions of the two sub-pixels 220 are on the same straight line (similar to the structure of two adjacent sub-pixels shown in FIG1 ), which can be called long axis connected, and there is a second bank layer 212 between the two sub-pixels 220. FIG14 shows the length L2 of the two sub-pixels 220 in the long axis direction and the length L2 in the short axis direction. S The area uniformity of the two sub-pixels = U(L2)*U(L S ), where U(L2) represents the uniformity value of the long axis connection structure of the two sub-pixels in the long axis direction. The uniformity value U(L2) is the percentage of the length of the sub-pixel portion of the long axis connection structure of the two sub-pixels in the long axis direction to the length L2 of the structure of the two sub-pixels in the long axis direction. The uniformity value is measured by a white light interferometer or other equipment. U(L S ) represents the uniformity value of the long axis connected structure of two sub-pixels in the short axis direction, and the uniformity value U(L S ) is the length of the sub-pixel portion of the long-axis connected structure of the two sub-pixels that emits uniform light in the short-axis direction, which accounts for the length L of the long-axis connected structure of the two sub-pixels in the short-axis direction. S The uniformity value is measured by white light interferometer or other equipment.

[0138] FIG14C is a schematic diagram illustrating calculation of the area of ​​interlaced-connected sub-pixels according to another embodiment of the present disclosure.

[0139] As shown in FIG14C , the long axis directions of the two sub-pixels 220 are parallel, and the two sub-pixels 220 are staggered, and the second bank layer 212 is located between the two sub-pixels 220. FIG14 shows the length L1 of the sub-pixel 220 in the long axis direction and the length L2 in the short axis direction. S FIG14 also shows the length L' of two sub-pixels along the short axis direction. S The area uniformity of two adjacent sub-pixels = U(L1)*U(L' S )≈U(L1)*U(L1), where U(L1) represents the uniformity value of the connected structure of two staggered sub-pixels in the long axis direction. The uniformity value U(L1) is the percentage of the length of the sub-pixel portion with uniform light emission in the connected structure of two staggered sub-pixels in the long axis direction to the length L1 of the connected structure of two staggered sub-pixels in the long axis direction. The uniformity value is measured by a white light interferometer or other equipment. U(L' S ) represents the uniformity value of the connected structure of two staggered sub-pixels in the short axis direction, and the uniformity value U(L' S) is the length of the sub-pixel portion of the staggered connected structure of two sub-pixels in the short axis direction, which is the length of the connected structure of the staggered connected structure of two sub-pixels in the short axis direction. S The percentage of the uniformity is measured by a white light interferometer or other equipment. Here, the short axis part in the middle that is actually not connected is not taken into account when calculating the area.

[0140] In addition, Table 1 shows the area uniformity of the display substrate in the cases where the long axes of the sub-pixels are disconnected, the short axes are disconnected, the long axes are connected, and the short axes are connected.

[0141] It can be seen from Table 1 that for a sub-pixel structure (eg, a single sub-pixel or a sub-pixel group), the uniformity in the long axis direction is greater than the uniformity in the short axis direction.

[0142] In addition, it can be seen from Table 1 that as the PPI of the display substrate increases, the proportion of the area uniformity of the short-axis connectivity in the entire area uniformity gradually increases, that is, the influence of the short-axis connectivity gradually increases.

[0143] Furthermore, it can be seen from Table 1 that as the printing thickness (ie, film thickness) increases (ie, the amount of printing ink increases), the impact on area uniformity gradually increases, and therefore the effect of connectivity also becomes greater.

[0144] Table 1

[0145] In some embodiments of the present disclosure, a display device is also provided. The display device includes the display substrate described above. For example, the display device can be a display panel, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigation system, or any other product or component with a display function.

[0146] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0147] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A display substrate, comprising: substrate substrate; and In the plurality of sub-pixel groups on the substrate, the sub-pixels in each sub-pixel group emit the same color, and sub-pixel groups of different colors are separated by a first bank layer, wherein: Each sub-pixel group includes a plurality of sub-pixels, adjacent sub-pixels among the plurality of sub-pixels are separated by a second embankment layer, wherein a height of the second embankment layer in a direction perpendicular to the substrate is less than a height of the first embankment layer in a direction perpendicular to the substrate, and the second embankment layer is adjacent to the first embankment layer, and in each sub-pixel group, an extension line of a midpoint of the second embankment layer between two adjacent sub-pixels among the plurality of sub-pixels in the first direction does not coincide with at least one of extension lines of respective midpoints of the two sub-pixels in the first direction.

2. The display substrate according to claim 1, wherein: A width of at least one sub-pixel among the plurality of sub-pixels in a second direction is greater than a width of the second bank layer in the second direction, and the second direction intersects the first direction.

3. The display substrate according to claim 1, wherein: The extension line of the midpoint of the second bank layer between the two adjacent subpixels in the plurality of subpixels in the first direction is located between the extension lines of the midpoints of the two subpixels in the first direction, and the second direction intersects the first direction.

4. The display substrate according to claim 1, wherein: The first direction is a column direction of a sub-pixel array formed by the plurality of sub-pixel groups.

5. The display substrate according to claim 2 or 3, wherein: The second direction is a row direction of a sub-pixel array formed by the plurality of sub-pixel groups.

6. The display substrate according to claim 1, wherein: The extending shape of the first bank layer is a fold line shape or a wave line shape.

7. The display substrate according to claim 1, wherein: The display substrate includes a plurality of first bank layers, wherein extension directions of at least two first bank layers among the plurality of first bank layers are substantially parallel, and lengths of the at least two first bank layers are equal.

8. The display substrate according to claim 1, wherein: The first embankment layer includes a first line portion and a second line portion, the first line portion and the second line portion are alternately distributed and connected as a whole, the extension directions of different first line portions in the first embankment layer are parallel, and the extension directions of different second line portions in the first embankment layer are parallel.

9. The display substrate according to claim 3, wherein: the second line portion extends along the second direction; The first line portion and the second line portion form a first angle.

10. The display substrate according to claim 9, wherein: The first angle is not 90 degrees.

11. The display substrate according to claim 8, wherein: A width of the first line portion in the second direction is equal to a width of the second line portion in the first direction.

12. The display substrate according to claim 3, wherein: The second bank layer includes third line portions and fourth line portions, which are alternately distributed, and different third line portions in the second bank layer extend in parallel directions, and different fourth line portions in the second bank layer extend in parallel directions.

13. The display substrate according to claim 12, wherein: The fourth line portion extends along the second direction; The third line portion and the fourth line portion form a second angle.

14. The display substrate according to claim 13, wherein: The second angle is not 90 degrees.

15. The display substrate according to claim 12, wherein: A width of the third line portion in the second direction is equal to a width of the fourth line portion in the first direction.

16. The display substrate according to claim 1, wherein: A width of the first bank layer in a direction perpendicular to an extension direction of the first bank layer is equal to a width of the second bank layer in a direction perpendicular to an extension direction of the second bank layer.

17. The display substrate according to claim 1, wherein: The height of the first bank layer ranges from 1.2 micrometers to 1.8 micrometers; The height of the second bank layer ranges from 0.5 micrometer to 1 micrometer.

18. The display substrate according to claim 1, wherein: A material of the first bank layer is the same as a material of the second bank layer, and the first bank layer and the second bank layer are connected as one.

19. The display substrate according to claim 1, wherein: The multiple sub-pixel groups include: a red sub-pixel group, a blue sub-pixel group and a green sub-pixel group, wherein the area of ​​the red sub-pixels in the red sub-pixel group, the area of ​​the blue sub-pixels in the blue sub-pixel group and the area of ​​the green sub-pixels in the green sub-pixel group are all equal.

20. The display substrate according to claim 1, wherein: The multiple sub-pixel groups include: a red sub-pixel group, a blue sub-pixel group and a green sub-pixel group, wherein the area of ​​the blue sub-pixels in the blue sub-pixel group is larger than the area of ​​the red sub-pixels in the red sub-pixel group, and the area of ​​the blue sub-pixels in the blue sub-pixel group is larger than the area of ​​the green sub-pixels in the green sub-pixel group.

21. The display substrate according to claim 1, wherein: The second bank layer includes a third line portion and a fourth line portion adjacent to the third line portion; Each subpixel group includes at least three subpixels, and the at least three subpixels include a first subpixel, a second subpixel adjacent to the first subpixel, and a third subpixel adjacent to the second subpixel, the first subpixel and the second subpixel are separated by the third line portion, and the second subpixel and the third subpixel are separated by the fourth line portion.

22. The display substrate according to claim 21, wherein: The shape of each sub-pixel is a parallelogram or an ellipse; The first sub-pixel and the second sub-pixel are located in the same sub-pixel row, and the second sub-pixel and the third sub-pixel are located in different sub-pixel rows.

23. The display substrate according to claim 22, wherein: The at least three sub-pixels include a plurality of sub-pixel rows, each sub-pixel row includes at least two sub-pixels, wherein in each sub-pixel group, the at least two sub-pixels in different sub-pixel rows are staggered.

24. The display substrate according to claim 21, wherein: The shape of each sub-pixel is a diamond or a triangle; The first sub-pixel and the second sub-pixel are located in different sub-pixel rows, the second sub-pixel and the third sub-pixel are located in different sub-pixel rows, and the sub-pixel row where the second sub-pixel is located is between the sub-pixel row where the first sub-pixel is located and the sub-pixel row where the third sub-pixel is located.

25. The display substrate according to claim 21, wherein: The shape of each sub-pixel is hexagonal or circular; In each sub-pixel group, the center of the first sub-pixel, the center of the second sub-pixel, and the center of the third sub-pixel are respectively located at different vertices of an equilateral triangle; The first sub-pixel is spaced apart from the third sub-pixel by another third line portion or another fourth line portion.

26. A display device comprising: A display substrate as claimed in any one of claims 1 to 25.

Images