Display substrate, display apparatus, and mask plate group

Abstract

A display substrate, a display apparatus, and a mask plate group. The display substrate comprises a base substrate and a plurality of repeat units. Each pixel group in each repeat unit comprises one first color sub-pixel, one pair of second color sub-pixels, and one third color sub-pixel. Among two pixel groups in a same repeat unit, the display substrate is configured to satisfy one of the following conditions: light-emitting layers of the first color sub-pixels located in different pixel groups are configured to be formed by a same mask opening, light-emitting layers of the second color sub-pixels located in different pixel groups are configured to be formed by a same mask opening, and light-emitting layers of the third color sub-pixels located in different pixel groups are configured to be formed by a same mask opening. Configuring light-emitting layers located in different pixel groups to share a same mask opening facilitates satisfying the requirement of a minimum distance between mask openings of a mask plate and facilitates increasing the pixel aperture ratio and prolonging device service life.

Description

Display substrate, display device and mask assembly Technical Field

[0001] At least one embodiment of this disclosure relates to a display substrate, a display device, and a mask assembly. Background Technology

[0002] Active matrix organic light-emitting diode (AMOLED) displays are self-emissive devices with advantages such as high contrast, fast response speed, excellent color performance, and thinness and flexibility. In display devices, the arrangement of different color sub-pixels can be changed to meet the demand for high pixel density (Pixels Per Inch, PPI) and achieve better display effects. Summary of the Invention

[0003] At least one embodiment of this disclosure provides a display substrate, a display device, and a mask assembly.

[0004] At least one embodiment of this disclosure provides a display substrate, comprising: a substrate; a plurality of repeating units arranged in an array on the substrate along a first direction and a second direction; each repeating unit comprising two pixel groups, each pixel group comprising a first color sub-pixel, a second color sub-pixel pair, and a third color sub-pixel; the second color sub-pixel pair comprising two second color sub-pixels; each sub-pixel comprising a first electrode, a light-emitting layer, and a second electrode stacked sequentially, the first electrode being located between the light-emitting layer and the substrate; in the two pixel groups of the same repeating unit, the display substrate is configured to satisfy one of the following conditions: the light-emitting layers of the first color sub-pixels located in different pixel groups are configured to be formed by the same mask opening; the light-emitting layers of the second color sub-pixels located in different pixel groups are configured to be formed by the same mask opening; the light-emitting layers of the third color sub-pixels located in different pixel groups are configured to be formed by the same mask opening.

[0005] For example, according to at least one embodiment of this disclosure, the light-emitting areas of two pixel groups in the same repeating unit are centrally symmetrically distributed.

[0006] For example, according to at least one embodiment of the present disclosure, the light-emitting regions of two pixel groups in the same repeating unit are mirror-symmetric with respect to at least one of an axis of symmetry extending along the first direction and an axis of symmetry extending along the second direction.

[0007] For example, according to at least one embodiment of the present disclosure, the plurality of repeating units include a first repeating unit and a second repeating unit that are adjacent in the first direction, wherein the light-emitting layer of the first color sub-pixel of the first repeating unit and the light-emitting layer of the first color sub-pixel of the second repeating unit are configured to be formed by the same mask opening.

[0008] For example, according to at least one embodiment of the present disclosure, the plurality of repeating units includes four repeating units arranged in an array along the first direction and the second direction, wherein the light-emitting layers of four adjacent second color sub-pixels are configured to be formed by the same mask opening.

[0009] For example, according to at least one embodiment of the present disclosure, in two pixel groups of the same repeating unit, the display substrate is configured to satisfy two of the following conditions: the light-emitting layer of the first color sub-pixel located in different pixel groups is configured to be formed by the same mask opening; the light-emitting layer of the second color sub-pixel located in different pixel groups is configured to be formed by the same mask opening; and the light-emitting layer of the third color sub-pixel located in different pixel groups is configured to be formed by the same mask opening.

[0010] For example, according to at least one embodiment of this disclosure, in the same repeating unit, the light-emitting areas of the sub-pixels of the two pixel groups are arranged in the same way.

[0011] For example, according to at least one embodiment of the present disclosure, in the same repeating unit, the two pixel groups are arranged in the second direction, and the light-emitting layers of the third color sub-pixels arranged in the second direction in the two pixel groups are configured to be formed by the same mask opening.

[0012] For example, according to at least one embodiment of this disclosure, in the same repeating unit, the light-emitting areas of the sub-pixels of the two pixel groups are arranged differently.

[0013] For example, according to at least one embodiment of the present disclosure, the plurality of repeating units are divided into a first sub-pixel column, a second sub-pixel column, and a third sub-pixel column arranged sequentially along the first direction and all extending along the second direction; the first sub-pixel column and the third sub-pixel column respectively include a first color sub-pixel and a second color sub-pixel, and there are two second color sub-pixels arranged in the second direction between two first color sub-pixels arranged in the second direction, and the second sub-pixel column includes a plurality of third color sub-pixels arranged in the second direction.

[0014] For example, according to at least one embodiment of the present disclosure, the light-emitting layers of the third color sub-pixels of the two pixel groups of the same repeating unit are configured to be formed using the same mask opening; on a reference plane perpendicular to the first direction, the orthographic projections of the light-emitting areas of the third color sub-pixels of the two pixel groups overlap with the orthographic projections of the light-emitting areas of the same first color sub-pixel.

[0015] For example, according to at least one embodiment of this disclosure, the apex corner of the light-emitting area of ​​at least one of the first color sub-pixel and the second color sub-pixel includes a rounded chamfer or a flat chamfer.

[0016] For example, according to at least one embodiment of the present disclosure, the light-emitting regions of the two second color sub-pixels of the second color sub-pixel pair have different shapes.

[0017] For example, according to at least one embodiment of the present disclosure, the edges of the light-emitting areas in two first color sub-pixels that are located in adjacent first and third sub-pixel columns and are close to each other are parallel.

[0018] For example, according to at least one embodiment of the present disclosure, the edges of the light-emitting areas in two second color sub-pixels that are located in adjacent first and third sub-pixel columns and are close to each other are parallel to each other.

[0019] For example, according to at least one embodiment of the present disclosure, two second color sub-pixels formed by the same mask opening have a first edge and a second edge disposed opposite to each other in the first direction, the two first edges of the two second color sub-pixels being on a straight line, and the two second edges of the two second color sub-pixels being on a straight line.

[0020] For example, according to at least one embodiment of the present disclosure, the extending directions of the two first edges intersect the extending directions of the two second edges.

[0021] For example, according to at least one embodiment of this disclosure, both the first sub-pixel column and the third sub-pixel column include two sub-columns, the two sub-columns being a first sub-column and a second sub-column, the first sub-column and the second sub-column being arranged along the first direction and both extending along the second direction; the arrangement of the light-emitting areas of the sub-pixels in the first sub-column is the same as the arrangement of the light-emitting areas of the sub-pixels in the second sub-column.

[0022] For example, according to at least one embodiment of the present disclosure, the light-emitting layer of the first color sub-pixel in the first sub-column and the light-emitting layer of the first color sub-pixel in the second sub-column are configured to be formed by the same mask opening, and the light-emitting layer of the second color sub-pixel in the first sub-column and the light-emitting layer of the second color sub-pixel in the second sub-column are configured to be formed by the same mask opening.

[0023] For example, according to at least one embodiment of the present disclosure, the plurality of repeating units are divided into a fourth sub-pixel column, a fifth sub-pixel column, and a sixth sub-pixel column arranged sequentially along the first direction and extending along the second direction respectively; the fourth sub-pixel column and the sixth sub-pixel column respectively include a plurality of first color sub-pixels and a plurality of third color sub-pixels arranged alternately in the second direction, and the fifth sub-pixel column includes a plurality of second color sub-pixel pairs arranged in the second direction.

[0024] For example, according to at least one embodiment of the present disclosure, in each of the repeating units, the light-emitting layers of the two second color sub-pixel pairs of the two pixel groups are configured to be formed by the same mask opening.

[0025] For example, according to at least one embodiment of this disclosure, the light-emitting area of ​​the first color sub-pixel and the light-emitting area of ​​the third color sub-pixel both extend along the second direction, and the size of the light-emitting area of ​​the second color sub-pixel in the second color sub-pixel pair in the first direction is not less than the size in the second direction.

[0026] For example, according to at least one embodiment of this disclosure, on a reference plane perpendicular to the first direction, the light-emitting area of ​​the first color sub-pixel of the fourth sub-pixel column at least partially overlaps with the light-emitting area of ​​the third color sub-pixel of the sixth sub-pixel column.

[0027] For example, according to at least one embodiment of the present disclosure, the light-emitting area of ​​at least one color sub-pixel extends along a third direction, which intersects the first direction and the second direction respectively.

[0028] For example, according to at least one embodiment of this disclosure, the plurality of repeating units are divided into a plurality of seventh sub-pixel columns and a plurality of eighth sub-pixel columns arranged alternately along the first direction and respectively extending along the second direction; each repeating unit includes a first color sub-pixel and a second color sub-pixel pair located in the seventh sub-pixel column, and a third color sub-pixel located in the eighth sub-pixel column; in each repeating unit, the center line connecting the light-emitting areas of the two second color sub-pixels in the second color sub-pixel pair passes through the first color sub-pixel, and the center line intersects the first direction and the second direction respectively.

[0029] For example, according to at least one embodiment of the present disclosure, the edges of the light-emitting areas of the two second color subpixels in the second color subpixel pair are parallel to each other.

[0030] For example, according to at least one embodiment of this disclosure, on a reference plane perpendicular to the first direction, the size of the orthographic projection of the light-emitting area of ​​the second color sub-pixel in the second direction is not less than the size of the orthographic projection of the light-emitting area of ​​the first color sub-pixel in the second direction.

[0031] For example, according to at least one embodiment of this disclosure, the light-emitting area of ​​the first color sub-pixel extends along the third direction, and the center line intersects the third direction.

[0032] For example, according to at least one embodiment of this disclosure, the apex corner of the light-emitting area of ​​at least one of the first color sub-pixel and the second color sub-pixel includes a rounded chamfer or a flat chamfer.

[0033] At least one embodiment of this disclosure provides a display substrate, comprising: a substrate; a plurality of pixel groups located on the substrate; each pixel group comprising a first color sub-pixel, a second color sub-pixel pair, and a third color sub-pixel arranged along a first direction; the second color sub-pixel pair comprising two second color sub-pixels arranged in a second direction, the first direction intersecting the second direction; wherein the light-emitting area of ​​the third color sub-pixel has a size in the first direction that is not less than its size in the second direction.

[0034] For example, according to at least one embodiment of this disclosure, the light-emitting area of ​​the first color sub-pixel extends along the second direction.

[0035] For example, according to at least one embodiment of the present disclosure, the center line of the light-emitting area of ​​the second color sub-pixel extending along the second direction passes through the light-emitting areas of other color sub-pixels.

[0036] For example, according to at least one embodiment of the present disclosure, the shape of the light-emitting area of ​​at least one of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel includes a quadrilateral.

[0037] For example, according to at least one embodiment of this disclosure, the apex corner of the light-emitting area of ​​at least one of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel includes a rounded chamfer or a flat chamfer.

[0038] For example, according to at least one embodiment of the present disclosure, the plurality of pixel groups are divided into a plurality of pixel rows, the plurality of pixel rows including a first pixel row and a second pixel row arranged alternately in the second direction; both the first pixel row and the second pixel row extend along the first direction; on a reference plane perpendicular to the second direction, the orthographic projection of the light-emitting area of ​​the first color sub-pixel in the first pixel row overlaps with the orthographic projection of the light-emitting area of ​​the third color sub-pixel in the second pixel row.

[0039] For example, according to at least one embodiment of this disclosure, the shape of the light-emitting area of ​​at least one of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel includes an arc-shaped edge.

[0040] For example, according to at least one embodiment of the present disclosure, the shape of the light-emitting area of ​​the first color sub-pixel includes an elongated strip extending along the second direction, the arcuate edge being located on at least one side of the elongated strip in the second direction; the shape of the light-emitting area of ​​at least one of the second color sub-pixel and the third color sub-pixel includes a circle or an ellipse.

[0041] At least one embodiment of this disclosure provides a display device including the display substrate described above.

[0042] At least one embodiment of this disclosure provides a mask assembly for fabricating the above-described display substrate, comprising: a first mask assembly including a plurality of first mask openings configured to form a light-emitting layer of a plurality of first color sub-pixels; a second mask assembly including a plurality of second mask openings configured to form a light-emitting layer of a plurality of second color sub-pixels; and a third mask assembly including a plurality of third mask openings configured to form a light-emitting layer of a plurality of third color sub-pixels; wherein at least one of the first mask openings, the second mask openings, and the third mask openings comprises a rounded chamfer or a flat chamfer at its apex. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure, and are not intended to limit this disclosure.

[0044] Figures 1A and 1B are schematic diagrams of pixel arrangement in different display devices.

[0045] Figure 2 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0046] Figure 3 is a schematic diagram of a partial cross-sectional structure cut along line AA' shown in Figure 2.

[0047] Figure 4 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 2.

[0048] Figure 5 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of this disclosure.

[0049] Figure 6 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 5.

[0050] Figure 7 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0051] Figure 8 is a schematic enlarged view of the light-emitting area of ​​some sub-pixels in Figure 7.

[0052] Figure 9 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 7.

[0053] Figure 10 is a schematic diagram of the mask opening of a mask plate provided in one example of at least one embodiment of the present disclosure.

[0054] Figure 11 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0055] Figure 12 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 11.

[0056] Figure 13 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0057] Figure 14 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 13.

[0058] Figure 15 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0059] Figure 16 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 15.

[0060] Figure 17 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0061] Figure 18 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 17.

[0062] Figure 19 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0063] Figure 20 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 19.

[0064] Figure 21 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0065] Figure 22 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 21.

[0066] Figure 23 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0067] Figure 24 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 23.

[0068] Figure 25 is a schematic diagram of the top corner of the mask opening, including the flat chamfer.

[0069] Figure 26 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure.

[0070] Figure 27 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 26. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0072] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0073] The terms "parallel," "perpendicular," and "identical" as used in this disclosure include the strictly defined meanings of "parallel," "perpendicular," and "identical," as well as terms such as "approximately parallel," "approximately perpendicular," and "approximately identical," which include a certain degree of error. Taking into account measurement and errors associated with the measurement of a specific quantity (i.e., limitations of the measurement system), they represent acceptable deviations for a specific value as determined by a person skilled in the art. In embodiments of this disclosure, "center" can include a strictly defined location at the geometric center as well as a location approximately at the center within a small area surrounding the geometric center. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the value.

[0074] Figures 1A and 1B are schematic diagrams of pixel arrangements in different display devices. Each pixel in the display device includes three different color sub-pixels. For example, Figure 1A shows that each pixel includes a red sub-pixel 01, a green sub-pixel pair 02, and a blue sub-pixel 03. The green sub-pixel pair 02 includes two green sub-pixels 021, and the sub-pixels in each pixel are arranged in a delta red-green-blue arrangement. For example, Figure 1B shows that each pixel includes a red sub-pixel 04, a green sub-pixel 05, and a blue sub-pixel 06, and the sub-pixels in each pixel are arranged in an S-stripe RGB (SRGB) arrangement. Figures 1A and 1B schematically show the distribution of the light-emitting areas of each color sub-pixel, i.e., the distribution of the pixel openings. Each color sub-pixel includes a stacked anode, a light-emitting layer, and a cathode. The pixel openings are configured to expose the anode to define the light-emitting area. The relative positional relationship of the anodes of different color sub-pixels is basically the same as the relative positional relationship of the pixel openings corresponding to different color sub-pixels.

[0075] Referring to Figure 1A, for example, mask opening F01 is used to form a light-emitting layer in the light-emitting area of ​​red sub-pixel 01, mask opening F02 is used to form a light-emitting layer in the light-emitting area of ​​green sub-pixel 02, and mask opening F03 is used to form a light-emitting layer in the light-emitting area of ​​blue sub-pixel 03. Referring to Figure 1B, for example, mask opening F04 is used to form a light-emitting layer in the light-emitting area of ​​red sub-pixel 04, mask opening F05 is used to form a light-emitting layer in the light-emitting area of ​​green sub-pixel 05, and mask opening F06 is used to form a light-emitting layer in the light-emitting area of ​​blue sub-pixel 06.

[0076] For example, in the pixel arrangement shown in Figure 1A, the pixel pitch is 96 micrometers, and the pixel aperture gap (PDL gap) is 20 micrometers. The aperture ratio of red, green, and blue subpixels is 1:1.4:2.2. The pixel aperture area of ​​red subpixels accounts for 4.2%, green subpixels account for 5.8%, and blue subpixels account for 9.1%, with an overall pixel aperture ratio of 19%.

[0077] For example, in the pixel arrangement shown in Figure 1B, the pixel pitch is 96 micrometers, and the spacing between pixel apertures is 20 micrometers. In the mask used to form the light-emitting area of ​​the blue sub-pixel, the distance between two adjacent mask apertures is 25 micrometers. The aperture ratio of the red, green, and blue sub-pixels is 1:1.4:2.2, the pixel aperture area ratio of the red sub-pixel is 7.1%, the pixel aperture area ratio of the green sub-pixel is 9.9%, and the pixel aperture area ratio of the blue sub-pixel is 15.6%, with an overall pixel aperture ratio of 32.6%.

[0078] In their research, the inventors of this application discovered that the pixel arrangement shown in Figures 1A and 1B corresponds to a relatively low pixel aperture ratio. Specifically, the smaller the spacing between two adjacent pixel apertures, the larger the area of ​​the pixel aperture, but the higher the risk of color mixing. Furthermore, due to limitations in the mask manufacturing process, the spacing between two adjacent mask apertures cannot be too small; that is, the solid portion (Rib) between two adjacent mask apertures needs to meet size design requirements. Referring to Figure 1A, a mask aperture F03 is used to form the light-emitting layer within the light-emitting area of ​​a blue sub-pixel 03, and the spacing between two adjacent mask apertures F03 is not less than 21 micrometers. Referring to Figure 1B, a mask aperture F06 is used to form the light-emitting layer within the light-emitting area of ​​a blue sub-pixel 06, and the spacing between two adjacent mask apertures F06 is not less than 25 micrometers. The smaller the size of the Rib, the greater the area of ​​the pixel aperture that can be occupied. However, if the size of the Rib is too small, the mask manufacturing becomes more difficult. Moreover, during the mesh stretching process, the mask is prone to uncontrollable deformation or even local breakage, resulting in significant mask wear and thus limiting the size of the pixel opening.

[0079] A lower pixel aperture ratio can affect the lifespan of a display and make it difficult to meet the requirements of high PPI. For example, in high PPI display devices, the pixel pitch is around 100 micrometers. In addition, in some irregularly shaped displays with curved edges or other non-straight edges, the edges of graphics in the displayed image are prone to jaggedness, making it difficult to improve smoothness.

[0080] At least one embodiment of this disclosure provides a display substrate. The display substrate includes a substrate and a plurality of repeating units, which are arranged in an array on the substrate along a first direction and a second direction. Each repeating unit includes two pixel groups, each pixel group including a first color sub-pixel, a second color sub-pixel pair, and a third color sub-pixel, the second color sub-pixel pair including two second color sub-pixels. Each sub-pixel includes a first electrode, a light-emitting layer, and a second electrode stacked sequentially, the first electrode being located between the light-emitting layer and the substrate. In the two pixel groups of the same repeating unit, the display substrate is configured to satisfy one of the following conditions: the light-emitting layers of the first color sub-pixels located in different pixel groups are configured to be formed by the same mask opening, the light-emitting layers of the second color sub-pixels located in different pixel groups are configured to be formed by the same mask opening, and the light-emitting layers of the third color sub-pixels located in different pixel groups are configured to be formed by the same mask opening.

[0081] The display substrate provided in this disclosure, by sharing the same mask opening between the light-emitting layers located in different pixel groups, helps to meet the minimum spacing requirements between mask openings and prevents uncontrollable deformation or breakage of the mask during the mesh stretching process. Simultaneously, the spacing between the light-emitting areas of sub-pixels of the same color can be reduced, which helps to increase the pixel aperture ratio and improve device lifespan.

[0082] At least one embodiment of this disclosure provides a display substrate. The display substrate includes a substrate and a plurality of pixel groups. The plurality of pixel groups are located on the substrate, and each pixel group includes a first color sub-pixel, a second color sub-pixel pair, and a third color sub-pixel arranged along a first direction. The second color sub-pixel pair includes two second color sub-pixels arranged in a second direction, the first direction intersecting the second direction, and the light-emitting area of ​​the third color sub-pixel having a size in the first direction that is not smaller than a size in the second direction.

[0083] At least one embodiment of the display substrate provided in this disclosure provides a display substrate in which the size of the light-emitting region of the third color sub-pixel in the first direction is not less than the size in the second direction, thereby ensuring that the size of the mask opening in the light-emitting region of the third color sub-pixel in the first direction is not less than the size in the second direction. This makes it easier to meet the minimum spacing requirement between two adjacent mask openings, and the pixel aperture ratio can be increased. Furthermore, during the screen stretching process, the mask can be stretched either along the second direction or along the first direction, thereby improving the utilization rate of the glass substrate during the fabrication of the display substrate.

[0084] At least one embodiment of this disclosure provides a display device, including the display substrate of any of the above embodiments.

[0085] At least one embodiment of this disclosure provides a mask assembly for fabricating a display substrate as described in the above embodiments. The mask assembly includes a first mask, a second mask, and a third mask. The first mask includes a plurality of first mask openings configured to form a light-emitting layer for a plurality of first color sub-pixels. The second mask includes a plurality of second mask openings configured to form a light-emitting layer for a plurality of second color sub-pixels. The third mask includes a plurality of third mask openings configured to form a light-emitting layer for a plurality of third color sub-pixels. At least one of the first, second, and third mask openings has a rounded or flat chamfered apex corner.

[0086] The mask assembly provided in at least one embodiment of this disclosure, by providing at least one of the first, second, and third mask openings with rounded or flat chamfered apex corners, can increase the minimum spacing between two mask openings to improve the strength of the mask assembly. Furthermore, stress can be uniformly diffused during the stretching process of the mask assembly. This prevents uncontrollable deformation of the mask assembly during stretching, thus improving the accuracy of organic material vapor deposition.

[0087] The display substrate, display device, and mask assembly are described below with reference to the accompanying drawings and through some embodiments.

[0088] Figure 2 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of this disclosure. Figure 3 is a schematic diagram of a partial cross-sectional structure cut along line AA' shown in Figure 2.

[0089] Referring to Figures 2 and 3, the display substrate includes a substrate 10 and a plurality of repeating units 100, which are arranged in an array on the substrate 10 along a first direction X and a second direction Y. For example, the first direction intersects the second direction. For example, the first direction and the second direction are perpendicular to each other.

[0090] Referring to Figure 2, each repeating unit includes two pixel groups (e.g., pixel group 110 and pixel group 120 shown in Figure 2). Each pixel group includes a first color sub-pixel 101, a second color sub-pixel pair 102, and a third color sub-pixel 103. The second color sub-pixel pair 102 includes two second color sub-pixels 1021. It should be noted that the two second color sub-pixels in the same second color sub-pixel pair can be adjacent to each other as shown in Figure 2. However, this disclosure is not limited to this. There can also be sub-pixels of other colors between two second color sub-pixels. For example, referring to the embodiments described later (e.g., referring to Figure 5), there can be a first color sub-pixel between the two second color sub-pixels in a second color sub-pixel pair.

[0091] Referring to Figure 2, for example, the first color sub-pixel 101 includes a first light-emitting area Z1, the second color sub-pixel 1021 includes a second light-emitting area Z2, and the third color sub-pixel 103 includes a third light-emitting area Z3. For example, the areas of the first and second light-emitting areas are both smaller than the area of ​​the third light-emitting area. For example, the first color sub-pixel can be a red sub-pixel, the second color sub-pixel can be a green sub-pixel, and the third color sub-pixel can be a blue sub-pixel. For example, in the same repeating unit, the light-emitting area of ​​the blue sub-pixel is larger than the light-emitting area of ​​the red sub-pixel, and the light-emitting area of ​​the blue sub-pixel is larger than the light-emitting area of ​​the green sub-pixel.

[0092] Figure 2 schematically shows that the outline of the luminous area of ​​each color sub-pixel is rectangular, but this disclosure is not limited to this. For example, it can also be a rounded rectangle, a rounded quadrilateral, or other shapes that approximate a rectangle, or even other quadrilaterals. Referring to Figure 1A, the outline of the sub-pixel luminous area is pentagonal or hexagonal, that is, the pixel opening in the pixel limiting layer is pentagonal or hexagonal. Compared to the pentagonal or hexagonal pixel opening shown in Figure 1A, the quadrilateral outline of the sub-pixel luminous area shown in Figure 2 can reduce the area ratio occupied by the spacing between adjacent pixel openings in the pixel limiting layer, thereby improving the pixel aperture ratio.

[0093] For example, the outline of the light-emitting area of ​​each color sub-pixel can also be a polygonal shape such as a hexagon or octagon, or it can be an ellipse, a circle, an irregular shape, etc., and this disclosure does not limit it in any way. It is understood that the outline of the light-emitting area of ​​the sub-pixel in the embodiments described later can also be the above-mentioned shapes, and this disclosure will not repeat them here.

[0094] Referring to Figures 2 and 3, each sub-pixel (e.g., first color sub-pixel 101, second color sub-pixel 1021 and third color sub-pixel 103) includes a first electrode 210, a light-emitting layer EML and a second electrode 220 stacked sequentially, with the first electrode 210 located between the light-emitting layer EML and the substrate 10.

[0095] In two pixel groups of the same repeating unit, the display substrate is configured to satisfy one of the following conditions: the light-emitting layer of the first color sub-pixel located in different pixel groups is configured to be formed by the same mask opening, the light-emitting layer of the second color sub-pixel located in different pixel groups is configured to be formed by the same mask opening, and the light-emitting layer of the third color sub-pixel located in different pixel groups is configured to be formed by the same mask opening.

[0096] For example, multiple first luminescent regions of a first color sub-pixel located in different pixel groups are adjacent to each other, so that the luminescent layers within the multiple first luminescent regions can be formed by the same mask opening. For example, multiple second luminescent regions of a second color sub-pixel located in different pixel groups are adjacent to each other, so that the luminescent layers within the multiple second luminescent regions can be formed by the same mask opening. For example, a luminescent layer is also provided between two adjacent luminescent regions. For example, multiple third luminescent regions of a third color sub-pixel located in different pixel groups are adjacent to each other, so that the luminescent layers within the multiple third luminescent regions can be formed by the same mask opening. For example, the aforementioned adjacent luminescent regions mean that there are no other luminescent regions between adjacent luminescent regions. For example, the third luminescent region Z31 and the third luminescent region Z32 shown in Figure 2 are adjacent to each other, and there are no other luminescent regions between them.

[0097] For example, in the repeating unit 100 shown in FIG2, the light-emitting area Z31 of the third color sub-pixel 103 in pixel group 110 and the light-emitting area Z32 of the third color sub-pixel 103 in pixel group 120 are adjacent to each other, so that the light-emitting layer located in the light-emitting area Z31 and the light-emitting layer located in the light-emitting area Z32 can be formed using the same mask opening.

[0098] Figure 4 is a schematic diagram of the mask assembly used to form the display substrate shown in Figure 2.

[0099] Referring to FIG4, this disclosure provides a mask assembly, including a first mask 910, a second mask 920, and a third mask 930. The first mask 910 includes a plurality of first mask openings 901, configured to form a light-emitting layer for a plurality of first color sub-pixels 101. The second mask 920 includes a plurality of second mask openings 902, configured to form a light-emitting layer for a plurality of second color sub-pixels 1021. The third mask 930 includes a plurality of third mask openings 903, configured to form a light-emitting layer for a plurality of third color sub-pixels 103.

[0100] Referring to Figures 4 and 2, the first mask opening 901 of the first mask 910 is used to form the light-emitting layer within the first light-emitting region Z1 of the first color sub-pixel 101. The second mask opening 902 of the second mask 920 is used to form the light-emitting layer within the second light-emitting region Z2 of the second color sub-pixel 1021. For example, the light-emitting layers within the second light-emitting regions Z2 of the two second color sub-pixels 1021 in the second color sub-pixel pair 102 can be formed by the same second mask opening 902. The light-emitting layers within the third light-emitting regions Z31 and Z32 located in the pixel group 110 and pixel group 120, respectively, can be formed by the same third mask opening 903 in the third mask 930.

[0101] Referring to Figure 4, for example, the first mask 910, the second mask 920, and the third mask 930 can be fine metal masks (FMMs). For example, Figure 4 schematically shows that the outlines of the first mask opening 901, the second mask opening 902, and the third mask opening 903 are rectangular. However, this disclosure is not limited to this; for example, they can also be approximately rectangular shapes such as rounded rectangles or rounded quadrilaterals. For example, the outlines of the first mask opening, the second mask opening, and the third mask opening can be similar to the outline shape of the light-emitting area of ​​the corresponding sub-pixel, which will not be elaborated further here.

[0102] For example, a light-emitting layer within multiple light-emitting areas of a sub-pixel of one color can be formed within the same mask opening. For example, the spacing between two adjacent light-emitting areas within the same mask opening is smaller than the spacing between light-emitting areas of sub-pixels of different colors. Among the multiple light-emitting areas within the same mask opening, the spacing between two adjacent light-emitting areas can be no greater than 10 micrometers, that is, the spacing between the two pixel openings corresponding to these two light-emitting areas can be no greater than 10 micrometers. For example, the aforementioned spacing can be from 7 micrometers to 10 micrometers. For example, the aforementioned spacing can be from 8 micrometers to 9 micrometers. However, this disclosure is not limited to this; for example, when the spacing between light-emitting areas of sub-pixels of different colors is larger, the spacing between two adjacent light-emitting areas within the mask opening can also be greater than 10 micrometers. Therefore, compared with the pixel arrangement shown in Figures 1A and 1B, the pixel arrangement of the embodiments of this disclosure can utilize the same mask opening to form light-emitting layers within multiple light-emitting areas, thereby achieving an increase in pixel aperture ratio.

[0103] The display substrate provided in this disclosure reduces the solid material portion of the mask by sharing a common mask opening between the light-emitting layers located in different pixel groups, which helps meet the minimum spacing requirements between the mask openings. This prevents uncontrollable deformation or breakage of the mask during the screen stretching process. Simultaneously, the spacing between the light-emitting areas of sub-pixels of the same color can be reduced, which helps increase the pixel aperture ratio and improve device lifespan.

[0104] For example, referring to Figure 3, in the direction Z perpendicular to the substrate 10, in addition to the light-emitting layer (EML), other functional layers may be included between the first electrode 210 and the second electrode 220. These other functional layers may include hole injection layers, hole transport layers, electron transport layers, electron injection layers, and other films. For example, the light-emitting layer may be formed by a fine metal mask, and at least one of the other functional layers may be a solid film. For example, the first electrode may be an anode, and the second electrode may be a cathode. For example, the first electrodes in different color sub-pixels may be spaced apart from each other, and the second electrodes of different colors may be integrally formed electrodes, such as electrodes formed over an entire surface.

[0105] Figure 3 schematically simplifies the other film layers between the first electrode 210 and the substrate 10 to film layer 20. Film layer 20 may include multiple conductive layers and insulating layers located between adjacent conductive layers. For example, the multiple conductive layers may include pixel circuits electrically connected to the first electrode 210 and signal lines electrically connected to the pixel circuits. The insulating layers may include organic layers, inorganic layers, and other film layers.

[0106] For example, referring to Figures 2 and 3, the display substrate can be a light-emitting diode display panel.

[0107] Referring to Figures 2 and 3, the display substrate further includes a pixel defining layer 300, which includes a plurality of pixel openings 310 to define the light-emitting areas of a plurality of sub-pixels. For example, the light-emitting layer EML located within the pixel openings 310 is in direct contact with the first electrode 210 and the second electrode 220 to achieve light emission.

[0108] Referring to Figure 2, in some examples, within the same repeating unit 100, such as repeating unit 100A, the arrangement of the light-emitting areas of the sub-pixels in pixel group 110 and pixel group 120 is different. For example, the different arrangement of the light-emitting areas means that the light-emitting areas of the sub-pixels in pixel group 110 cannot be overlapped with the light-emitting areas of the sub-pixels in pixel group 120 by translation.

[0109] In some examples, the light-emitting areas of two pixel groups within the same repeating unit are centrally symmetrically distributed. For example, referring to Figure 2, the light-emitting areas located in pixel group 110 and pixel group 120 are centrally symmetrically distributed with respect to the geometric center of repeating unit 100. For example, the midpoint of the line connecting the centers of the third light-emitting area Z31 and the third light-emitting area Z32 coincides with the geometric center of repeating unit 100.

[0110] For example, the center of the aforementioned sub-pixel light-emitting area may be its geometric center, the intersection of the perpendicular bisectors of its sides, or a point within the sub-pixel light-emitting area that is approximately equidistant from each side. Of course, the center of the sub-pixel light-emitting area can have some margin of error. For instance, the center of the sub-pixel light-emitting area can be any point within a radius of 3 micrometers centered on the geometric center of the sub-pixel light-emitting area.

[0111] Referring to Figure 2, the light-emitting areas of two pixel groups (e.g., pixel group 110 and pixel group 120) in the same repeating unit 100 are centrally symmetrically distributed. Thus, in two adjacent repeating units, such as the first repeating unit 100A and the second repeating unit 100B arranged in the first direction X, the first color sub-pixel 101A and the second color sub-pixel 1021B overlap on a reference plane perpendicular to the first direction X. For example, there are no other repeating units between two adjacent repeating units. For example, sub-pixels of the same color in two adjacent repeating units are not aligned in the first direction. Therefore, in displays with curved edges in some display areas, such as irregularly shaped displays, the staggered arrangement can be used to weaken the jaggedness of the displayed image and improve the display effect of non-rectangular displays.

[0112] Referring to Figures 2 and 4, the second mask opening 902 corresponds to the second emitting area Z2 of two second color sub-pixels 1021 in a second color sub-pixel pair 102, and the third mask opening 903 corresponds to the third emitting area Z3 of two third color sub-pixels 103 in two pixel groups. This can increase the mask opening size of the mask. Moreover, the spacing between two emitting areas within the same mask opening is shortened; for example, the third emitting area can extend in the second direction to increase its size, which is beneficial for increasing the pixel aperture ratio and thus improving product lifespan specifications.

[0113] Meanwhile, in photomasks used to form the same color, the spacing between mask openings easily meets minimum size requirements. This makes it easier for the solid portion between two mask openings to meet manufacturing needs, and even allows for increased solid portion size while maintaining pixel aperture ratio, thereby improving photomask strength. This not only reduces the risks of color mixing and crosstalk but also simplifies the photomask manufacturing process.

[0114] The area containing the solid material of the photomask, such as the area between two second-color sub-pixels, can be used to arrange the transition parts in the pixel circuit described above, as well as traces in the pixel circuit that are difficult to arrange symmetrically, such as initialization signal lines, and vias in the pixel limiting layer. This can improve the flatness of the first electrode within the pixel opening, which is beneficial for improving color shift.

[0115] For example, as shown in Figure 4, the two second light-emitting areas Z2 of the two second color sub-pixels 1021 sharing the same second mask opening 902 are arranged in the second direction Y, and the two third light-emitting areas Z3 of the two third color sub-pixels 103 sharing the same third mask opening 903 are arranged in the second direction Y. However, this disclosure is not limited to this; for example, the two second light-emitting areas sharing the same second mask opening can also be arranged in the first direction, and the two third light-emitting areas sharing the same third mask opening can also be arranged in the first direction.

[0116] Referring to Figure 2, in some examples, multiple repeating units 100 are divided into a first sub-pixel column C1, a second sub-pixel column C2, and a third sub-pixel column C3, arranged sequentially along a first direction X and extending along a second direction Y. The first sub-pixel column C1 and the third sub-pixel column C3 respectively include first color sub-pixels 101 and second color sub-pixels 1021, and two first color sub-pixels 101 arranged in the second direction Y are separated by two second color sub-pixels 1021 arranged in the second direction Y. The second sub-pixel column C2 includes multiple third color sub-pixels 103 arranged in the second direction Y. For example, the two second color sub-pixels 1021 located between two first color sub-pixels 101 can be two sub-pixels in a second color sub-pixel pair 102. By setting different color sub-pixel arrangements, two pixel groups of the same repeating unit can share sub-pixels, which is beneficial for improving the resolution and display effect of the display device including the display substrate.

[0117] For example, the relative positional relationship of sub-pixels of different colors (e.g., first-color sub-pixels and second-color sub-pixels) in the first and third sub-pixel columns can be changed. For example, the relative positional relationship between the first, second, and third sub-pixel columns can also be changed. This disclosure does not limit this. For example, in the second sub-pixel column, the light-emitting layer within the light-emitting area of ​​two third-color sub-pixels can be formed by a third mask opening, that is, the third-color sub-pixels can be arranged in a 2-in-1 configuration. However, this disclosure is not limited to this; for example, the third-color sub-pixels can also be arranged in a 1-in-1 configuration, a 4-in-1 configuration, a 6-in-1 configuration, an 8-in-1 configuration, etc. It is understood that in the embodiments described later, the arrangement of sub-pixels can also be changed, and this disclosure will not elaborate further.

[0118] For example, in the pixel arrangement shown in Figure 2, the pixel pitch is 96 micrometers, and the spacing between pixel apertures is 20 micrometers. The distance between the emitting areas of two adjacent second-color subpixels is 12 micrometers, and the distance between the emitting areas of two adjacent third-color subpixels is 12 micrometers. In the mask used to form the emitting area of ​​the third-color subpixel, the distance between two adjacent mask apertures is 25 micrometers. The aperture ratio of the first-color subpixel, the second-color subpixel, and the third-color subpixel is 1:1.4:2.2. The pixel aperture area ratio of the first-color subpixel is 8.7%, the second-color subpixel is 12.2%, and the third-color subpixel is 19.1%, with an overall pixel aperture ratio of 40.0%. Compared with the pixel arrangement shown in Figure 1A, the pixel aperture ratio can be increased by approximately 110.5%, and compared with the pixel arrangement shown in Figure 1B, the pixel aperture ratio can be increased by approximately 22.7%.

[0119] Figure 5 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 6 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 5.

[0120] The difference between the pixel arrangement diagram shown in Figure 5 and the pixel arrangement diagram shown in Figure 2 is that the relative positional relationship between the first sub-pixel column and the third sub-pixel column shown in Figure 5 is different from that shown in Figure 2.

[0121] Referring to Figures 5 and 6, in some examples, the light-emitting layers within the third light-emitting area Z3 of the third color sub-pixels 103 of two pixel groups in the same repeating unit 100 are configured to be formed using the same mask opening, such as the third light-emitting areas Z31 and Z32 being formed by the same third mask opening 903. On a reference plane perpendicular to the first direction X, the orthographic projections of the third light-emitting area Z31 of the third color sub-pixels 103 of pixel group 110 and the orthographic projections of the third light-emitting area Z32 of the third color sub-pixels 103 of pixel group 120 overlap with the orthographic projections of the first light-emitting area Z1 of the same first color sub-pixel 101, respectively. For example, the distance by which the first sub-pixel column C1 and the third sub-pixel column C3 shown in Figure 5 are offset in the second direction Y is the size of a second color sub-pixel 1021 in the second direction Y.

[0122] For example, in a repeating unit 100 as shown in FIG. 2, in the first sub-pixel column C1 and the third sub-pixel column C3, the second light-emitting areas Z2 of the two second color sub-pixels 1021 are located on the same side of the first light-emitting area Z1 of the first color sub-pixel 101. For example, in a repeating unit 100 as shown in FIG. 5, in the first sub-pixel column C1, the first light-emitting area Z1 of the first color sub-pixel 101 is located between the second light-emitting areas Z2 of the two second color sub-pixels 1021, and in the second sub-pixel column C2, the second light-emitting areas Z2 of the two second color sub-pixels 1021 are located on the same side of the first light-emitting area Z1 of the first color sub-pixel 101.

[0123] Figure 7 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 8 is a schematic enlarged view of a portion of the sub-pixel light-emitting area in Figure 7. Figure 9 is a schematic diagram of a mask assembly used to form the display substrate shown in Figure 7.

[0124] The difference between the pixel arrangement diagram shown in Figure 7 and the pixel arrangement diagram shown in Figure 5 is that the shape of the light-emitting area of ​​the sub-pixel shown in Figure 7 is different from that of the sub-pixel shown in Figure 5.

[0125] Referring to Figures 7 to 9, in some examples, the apex corner O of the light-emitting area of ​​at least one of the first color sub-pixel 101 and the second color sub-pixel 1021 includes a rounded chamfer or a flat chamfer. For example, the apex corner of the light-emitting area of ​​the first color sub-pixel may include a rounded chamfer or a flat chamfer. For example, the apex corner of the light-emitting area of ​​the second color sub-pixel may include a rounded chamfer or a flat chamfer. For example, when the apex corner of the light-emitting area of ​​the first color sub-pixel includes a rounded chamfer (or a flat chamfer), the first mask opening of the first mask plate may also correspondingly include a rounded chamfer (or a flat chamfer). For example, when the apex corner of the light-emitting area of ​​the second color sub-pixel includes a rounded chamfer (or a flat chamfer), the second mask opening of the second mask plate may also correspondingly include a rounded chamfer (or a flat chamfer).

[0126] For example, referring to Figures 7 to 9, the aforementioned vertex O1 can be a line segment formed by the intersection of the two sides of a vertex extending towards its vertex, making the vertex a flat chamfer. For example, vertex O1 includes a flat chamfer, and the vertex of vertex O1 can be the intersection point P of the line connecting the intersection of the two sides used to form the flat chamfer and the vertex of the opposite vertex O2 with the flat chamfer. For example, vertex O2 can be the included angle between two straight lines. For example, vertex O2 can be a right angle, an acute angle, or an obtuse angle. For example, the two straight sides used to form the right angle, acute angle, or obtuse angle can be smoothly transitioned by an arc so that the tension can be evenly distributed when the mask is stretched; this disclosure does not limit this.

[0127] For example, referring to Figure 7, the apex of the luminous area of ​​the first color sub-pixel may include two flat chamfers, and the shape of the luminous area may be pentagonal or hexagonal. Similarly, the apex of the luminous areas of the two second color sub-pixels in a second color sub-pixel pair may each include different numbers of flat chamfers; for example, the shape of a luminous area including one flat chamfer may be quadrilateral, and the shape of a luminous area including two flat chamfers may be hexagonal. However, this disclosure is not limited to this; for example, the apex of the luminous area may include one flat chamfer, or it may include three or more flat chamfers. For example, the shape of the luminous area may be triangular, or it may be a polygon with seven or more sides.

[0128] Figure 10 is a schematic diagram of the mask opening of a mask plate provided in one example of at least one embodiment of the present disclosure. For example, Figure 10 schematically shows that the light-emitting areas of two first color sub-pixels 101 in pixel group 110 and pixel group 120 are located within the same first mask opening 901 of the first mask plate 910.

[0129] For example, referring to Figure 10, the aforementioned apex angle O1 can be a curve formed by the intersection of the two sides of a apex angle extending towards its vertex, making the apex angle a rounded chamfer. For example, apex angle O1 includes a rounded chamfer, and the vertex of apex angle O1 can be the intersection point P of the line connecting the intersection of the extensions of the two sides used to form the rounded chamfer and the vertex of the apex angle O2 opposite to the rounded chamfer, and the rounded chamfer itself. In this case, apex angle O1 can be a range of a micrometers along the contour centered at vertex P. For example, the value of a can be greater than 1 micrometer. For example, the value of a can be less than the edge length of the light-emitting area. For example, the edge length of the light-emitting area and the value of the chamfer can be set based on the aperture ratio requirement, and this disclosure does not limit this.

[0130] Referring to Figures 7 through 10, at least one of the first mask opening 901, the second mask opening 902, and the third mask opening 903 has a rounded or flat chamfered apex. For example, the first mask opening 901 may include a rounded or flat chamfer. For example, the second mask opening 902 may include a rounded or flat chamfer. For example, the third mask opening 903 may include a rounded or flat chamfer. For example, the vertical distance between the edge of the mask opening and the edge of the light-emitting area within the mask opening is substantially the same everywhere to prevent color mixing.

[0131] Referring to Figures 7 to 10, by setting the apex corner of the light-emitting area of ​​at least one of the first and second color sub-pixels to include a rounded chamfer (or a flat chamfer), the mask opening used to form the light-emitting layer within that light-emitting area can also be set to include a rounded chamfer (or a flat chamfer). Therefore, while keeping the areas of the two light-emitting areas constant, the minimum spacing D between the two mask openings (refer to the two first mask openings 901 in Figure 10) can be increased to improve the strength of the mask. Furthermore, stress can be uniformly diffused during the stretching process of the mask. This prevents uncontrollable deformation of the mask during stretching, which is beneficial for improving the accuracy of organic material evaporation.

[0132] For example, the aforementioned minimum spacing D is an upward-sloping spacing, that is, a spacing in a direction that intersects both the first and second directions. For example, the minimum spacing D can be increased from 21 micrometers to 25.7 micrometers. For example, when the minimum spacing D between the two mask openings is the minimum value required for the mask design, that is, when the minimum spacing D remains unchanged, the area of ​​the two light-emitting areas can be increased, thereby improving the pixel aperture ratio.

[0133] Referring to Figure 7, in some examples, the shapes of the light-emitting areas Z2 of the two second color sub-pixels 1021 of the second color sub-pixel pair 102 are different, thereby improving space utilization and increasing the area of ​​the light-emitting area.

[0134] Referring to Figures 7 and 8, in some examples, the adjacent edges of the light-emitting areas in two adjacent first color sub-pixels 101 located in adjacent first sub-pixel columns C1 and third sub-pixel columns C3 are parallel. For example, the edge E1A of the first light-emitting area Z1A and the edge E1B of the first light-emitting area Z1B are parallel. For example, the adjacent edges of two adjacent first mask openings used to form the light-emitting layer in the corresponding light-emitting area are parallel, and the stress on the solid portion between two adjacent first mask openings can be more even during mask stretching.

[0135] Referring to Figures 7 and 8, in some examples, the adjacent edges of the light-emitting areas in two adjacent second color sub-pixels 1021 located in the first sub-pixel column C1 and the third sub-pixel column C3 are parallel. For example, the edge E2A of the second light-emitting area Z22A is parallel to the edge E2B of the second light-emitting area Z22B. For example, the adjacent edges of two adjacent second mask openings used to form the light-emitting layer within the corresponding light-emitting area are parallel, allowing for a more even distribution of force on the solid portion between adjacent second mask openings during mask stretching.

[0136] Referring to Figures 7 to 9, in some examples, two second color sub-pixels 1021 formed by the same mask opening 902 have first edges E01 and second edges E02 respectively arranged opposite to each other in the first direction X. The two first edges E01 of the two second color sub-pixels 1021 are on a straight line L1, and the two second edges E02 of the two second color sub-pixels 1021 are on a straight line L2. This facilitates the design of the shape of a corresponding second mask opening 902 based on the shape of the light-emitting area of ​​the two second color sub-pixels 1021, which can improve the accuracy of the second mask 920 and simplify the manufacturing process of the second mask 920.

[0137] Referring to Figures 7 to 9, in some examples, the extension directions of the two first edges E01 intersect the extension directions of the two second edges E02. For example, straight line L1 intersects straight line L2. For example, the extension directions of the two opposite edges of the second mask openings 902 corresponding to the two light-emitting areas of the two second color sub-pixels 1021 in the first direction X intersect. Taking the third sub-pixel column C3 shown in Figure 7 as an example, along the top-to-bottom direction shown in Figure 7, the dimensions of adjacent second light-emitting areas Z21 and Z22 in the first direction X generally have a gradually decreasing trend, and thus the dimensions of the second mask openings 902 corresponding to these two light-emitting areas in the first direction X also generally have a gradually decreasing trend.

[0138] For example, within the same column of subpixels, along the extension direction of the subpixel column (e.g., the second direction Y), the overall trend of the size variation of the luminous area of ​​the first color subpixel in the first direction is the same as the overall trend of the size variation of the luminous area of ​​two adjacent second color subpixels in the first direction. For example, two adjacent second color subpixels are formed by the same second mask opening. The aforementioned overall trend of variation refers to the main trend of the size variation of the luminous area in the first direction, such as the trend of variation in more than 50% of the portion in the extension direction. It is understood that local reverse variations or local no-change situations are allowed within the aforementioned overall trend of variation.

[0139] Taking the third sub-pixel column C3 shown in Figure 7 as an example, along the top-to-bottom direction shown in Figure 7, the size of the first light-emitting area Z1 in the first direction X generally tends to gradually decrease, and the sizes of the two adjacent second light-emitting areas Z21 and Z22 in the second direction Y generally tend to gradually decrease in the first direction X. For example, the local sizes of the first light-emitting area Z1 and the second light-emitting area Z21 in the first direction X may gradually increase.

[0140] Figure 11 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 12 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 11.

[0141] Referring to Figures 11 and 12, in some examples, the plurality of repeating units 100 include a first repeating unit 100A and a second repeating unit 100B adjacent in the first direction X. The light-emitting layer in the first light-emitting region Z1 of the first color sub-pixel 101 of the first repeating unit 100A and the light-emitting layer in the first light-emitting region Z1 of the first color sub-pixel 101 of the second repeating unit 100B are configured to be formed by the same mask opening (e.g., a first mask opening 901). Forming the light-emitting layers in two light-emitting regions simultaneously by a single mask opening easily meets the spacing requirements between two adjacent mask openings and can also increase the pixel aperture ratio.

[0142] Referring to Figures 11 and 12, in some examples, the plurality of repeating units 100 includes four repeating units arranged in an array along the first direction X and the second direction Y. In the four repeating units, the light-emitting layers in the four light-emitting regions Z2 of four adjacent second color sub-pixels 1021 are configured to be formed by the same mask opening (e.g., the second mask opening 902) to increase the pixel aperture ratio and reduce the fabrication difficulty of the mask. For example, the four second light-emitting regions Z2 can be arranged in an array along the first direction X and the second direction Y.

[0143] Referring to Figures 11 and 12, in some examples, both the first sub-pixel column C1 and the third sub-pixel column C3 include two sub-columns C0. Each sub-column C0 includes a first sub-column C11 and a second sub-column C12. The first sub-column C11 and the second sub-column C12 are arranged along a first direction X and both extend along a second direction Y. The arrangement of the light-emitting areas of the sub-pixels in the first sub-column C11 is the same as that in the second sub-column C12, thus allowing the light-emitting layers within the light-emitting areas of more sub-pixels to be formed by the same mask opening.

[0144] Referring to Figures 11 and 12, in some examples, the light-emitting layer in the light-emitting area of ​​the first color sub-pixel 101 in the first sub-column C11 and the light-emitting layer in the light-emitting area of ​​the first color sub-pixel 101 in the second sub-column C12 are configured to be formed by the same mask opening (e.g., the first mask opening 901), and the light-emitting layer in the light-emitting area of ​​the second color sub-pixel 1021 in the first sub-column C11 and the light-emitting layer in the light-emitting area of ​​the second color sub-pixel 1021 in the second sub-column C12 are configured to be formed by the same mask opening (e.g., the second mask opening 902).

[0145] Referring to Figure 11, for example, the first sub-column C11 may include a first color sub-pixel 101 and a second color sub-pixel pair 102 alternately arranged in the second direction Y. For example, the second sub-column C12 may include a first color sub-pixel 101 and a second color sub-pixel pair 102 alternately arranged in the second direction Y. The first color sub-pixel 101 in the first sub-column C11 may be aligned with the first color sub-pixel 101 in the second sub-column C12, and the second color sub-pixel pair 102 in the first sub-column C11 may be aligned with the second color sub-pixel pair 102 in the second sub-column C12.

[0146] For example, the arrangement of different color sub-pixels in the first and second sub-columns is not limited to the arrangement shown in Figure 11, but can be changed to other arrangements, and this disclosure does not limit this.

[0147] Referring to Figure 11, the two first-color sub-pixels 101 are adjacent to each other, the four second-color sub-pixels 1021 are adjacent to each other, and the two third-color sub-pixels 103 are adjacent to each other, which can improve the contrast of visible light in monochrome display. In addition, the pixel arrangement shown in Figure 11 can be adapted to high PPI products, and the device lifespan is improved.

[0148] It is understood that Figure 11 schematically shows two first color sub-pixels 101 adjacent to each other in the first direction X, four second color sub-pixels 1021 arranged in an array adjacent to each other, and two third color sub-pixels 103 adjacent to each other in the second direction Y, but this disclosure is not limited thereto. For example, multiple adjacent first color sub-pixels may also be arranged in the second direction, multiple adjacent third color sub-pixels may also be arranged in the first direction, and multiple second color sub-pixels may also be arranged in either the first or second direction.

[0149] For example, Figure 11 schematically shows that the first light-emitting area Z1, the second light-emitting area Z2, and the third light-emitting area Z3 are all rectangular, but this disclosure is not limited to this. For example, the shape of the light-emitting area can be a non-rectangular quadrilateral, hexagon, octagon, or other polygon, or it can be a circle, ellipse, or irregular shape.

[0150] Referring to Figure 11, in some examples, the light-emitting areas of two pixel groups in the same repeating unit 100 are mirror-symmetric with respect to at least one of an axis of symmetry AX1 extending along a first direction X and an axis of symmetry AX2 extending along a second direction Y. For example, the axis of symmetry AX1 may be located between the third light-emitting areas Z3 of the two third color sub-pixels 103, and the light-emitting areas in each repeating unit 100 are mirror-symmetric with respect to the axis of symmetry AX1. For example, the axis of symmetry AX2 may coincide with the line connecting the centers of the third light-emitting areas Z3 of the two third color sub-pixels 103, and the light-emitting areas in each repeating unit 100 are mirror-symmetric with respect to the axis of symmetry AX2.

[0151] For example, in the pixel arrangement shown in Figure 11, the pixel pitch is 96 micrometers, and the spacing between pixel openings is 20 micrometers. In the mask used to form the light-emitting area of ​​the first color sub-pixel and the mask used to form the light-emitting area of ​​the second color sub-pixel, the spacing between two adjacent mask openings on the same mask can meet the minimum spacing requirement. In the mask used to form the light-emitting area of ​​the third color sub-pixel, the distance between two adjacent mask openings is 35 micrometers. The distance between two light-emitting areas within the same mask opening is not less than 10 micrometers, such as 12 micrometers in this embodiment. The opening ratio of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel is 1:1.4:2.2, the pixel opening area ratio of the first color sub-pixel is 11.0%, the pixel opening area ratio of the second color sub-pixel is 15.3%, and the pixel opening area ratio of the third color sub-pixel is 24.1%, with an overall pixel opening rate of 50.4%. Compared with the pixel arrangement shown in Figure 1A, the pixel aperture ratio can be increased by approximately 165.3%, and compared with the pixel arrangement shown in Figure 1B, the pixel aperture ratio can be increased by approximately 54.6%.

[0152] Figure 13 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 14 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 13.

[0153] Referring to Figure 13, in some examples, the light-emitting area of ​​at least one color sub-pixel extends along a third direction V, which intersects with the first direction X and the second direction Y, respectively. By setting the light-emitting area of ​​at least one color sub-pixel to extend along a third direction, i.e., obliquely, it is beneficial to improve the oblique jaggedness, optimize image quality, and thus improve image quality uniformity. In addition, setting the light-emitting area to extend obliquely allows for more areas not covered by the light-emitting area, where connecting parts such as vias and adapter holes can be placed, which helps to improve the flatness of the first electrode. This effectively prevents color shift, increases ambient contrast ratio (ACR), and prevents reflection. Moreover, compared with the pixel arrangement shown in Figures 1A and 1B, it can also increase the pixel aperture ratio, thereby improving device lifespan.

[0154] For example, referring to Figure 13, the first luminous region Z1 of the first color sub-pixel 101 extends along a third direction V. For example, the angle between the third direction V and the first direction X is 30 to 60 degrees to meet the pixel aperture ratio design requirements. For example, the angle between the third direction V and the first direction X refers to the acute angle between them. For example, the angle between the third direction V and the first direction X can be 35 to 55 degrees. For example, the angle between the third direction V and the first direction X can be 40 to 50 degrees. For example, the angle between the third direction V and the first direction X can be 45 degrees.

[0155] Referring to Figure 13, in some examples, multiple repeating units 100 are divided into multiple seventh sub-pixel columns C7 and multiple eighth sub-pixel columns C8, which are alternately arranged along a first direction X and extend along a second direction Y, respectively. Each repeating unit 100 includes a first color sub-pixel 101 and a second color sub-pixel pair 102 located in the seventh sub-pixel column C7, and a third color sub-pixel 103 located in the eighth sub-pixel column C8. In each repeating unit 100, the center line LG connecting the light-emitting areas of the two second color sub-pixels 1021 in the second color sub-pixel pair 102 passes through the first color sub-pixel 101, and the center line LG intersects the first direction X and the second direction Y, respectively. For example, the two second light-emitting areas Z2 of the two second color sub-pixels 1021 are located on both sides of the center line of the first light-emitting area Z1 of the first color sub-pixel 101, and the center line of the first light-emitting area Z1 extends along a third direction V and passes through the geometric center of the first light-emitting area Z1. Thus, the first light-emitting area and the two second light-emitting areas located on both sides of the first light-emitting area can work together to improve the oblique aliasing.

[0156] Referring to Figures 13 and 14, in some examples, the edges EG1 and EG2 of the adjacent light-emitting areas in the two second color sub-pixels 1021 of 102 are parallel. For example, the edges of the adjacent second mask openings 9021 and 9022 used to form the two second color sub-pixels 1021 are parallel, that is, the spacing between the adjacent edges of the adjacent second mask openings 9021 and 9022 is basically equal everywhere, which is beneficial to stress balance during the meshing process and to increasing the pixel aperture ratio.

[0157] Referring to Figures 13 and 14, in some examples, the center line LG intersects with the third direction V. For example, the center line LG intersects with both the first direction X and the second direction Y. For example, the two second light-emitting areas Z2 of the two second color sub-pixels 1021 are located diagonally on both sides of the first light-emitting area Z1 of the first color sub-pixel 101. By setting the two second color sub-pixels 1021 opposite each other diagonally, the arrangement of the sub-pixel light-emitting areas can be made more reasonable, which is beneficial to increasing the pixel aperture ratio.

[0158] Referring to Figures 13 and 14, in some examples, the luminous areas of the subpixels in the same repeating unit 100 (e.g., pixel group 110 and pixel group 120) are arranged in the same way, which is beneficial to improving color uniformity and brightness consistency.

[0159] Referring to Figures 13 and 14, in some examples, in the same repeating unit 100, pixel groups 110 and 120 are arranged in the second direction Y, and the light-emitting layers in the third light-emitting region Z3 of the third color sub-pixels 103 arranged in the second direction Y in pixel groups 110 and 120 are configured to be formed by the same mask opening 903. Forming the light-emitting layers in two light-emitting regions simultaneously by a single mask opening easily meets the spacing requirements between two adjacent mask openings and can also increase the pixel aperture ratio.

[0160] For example, referring to FIG13, the second color sub-pixel G11 in pixel group 110 and the second color sub-pixel G21 in pixel group 120 are aligned in the second direction Y, and the second color sub-pixel G12 in pixel group 110 and the second color sub-pixel G22 in pixel group 120 are aligned in the second direction. However, this disclosure is not limited to this. For example, the pixel row where pixel group 110 is located can be staggered with the pixel row where pixel group 120 is located. For example, the second color sub-pixel G11 and the second color sub-pixel G22 can be aligned in the second direction Y and adjacent to each other, so that the light-emitting layer in the light-emitting area of ​​the second color sub-pixel G11h and the second color sub-pixel G22 is formed by the same mask opening.

[0161] Referring to Figure 13, in some examples, the apex corner of the luminous area of ​​at least one of the first color sub-pixel 101 and the second color sub-pixel 1021 includes a rounded chamfer or a flat chamfer. For example, the first luminous area Z1 of the first color sub-pixel 101 may include multiple flat chamfers, such as four flat chamfers, and the shape of the first luminous area 101 may be octagonal. For example, the apex corner of the second luminous area Z2 of the second color sub-pixel 1021 may include multiple flat chamfers, such as two flat chamfers, and the shape of the second luminous area 102 may be hexagonal. For example, the apex corner of the luminous area of ​​each color sub-pixel may also include a rounded chamfer. Flat chamfers and rounded chamfers can be referred to the specific descriptions in the foregoing embodiments, and will not be repeated here.

[0162] Referring to Figure 14, for example, the contours of the first mask opening 901, the second mask opening 902 and the third mask opening 903 can be similar to the contour shape of the light-emitting area of ​​the corresponding sub-pixel, which will not be described in detail here.

[0163] In some examples, within two pixel groups of the same repeating unit, the display substrate is configured to satisfy two of the following conditions: the light-emitting layers of the first color sub-pixel located in multiple first light-emitting areas of different pixel groups are formed by the same mask opening; the light-emitting layers of the second color sub-pixel located in multiple second light-emitting areas of different pixel groups are formed by the same mask opening; and the light-emitting layers of the third color sub-pixel located in multiple third light-emitting areas of different pixel groups are formed by the same mask opening. This helps to meet the minimum spacing requirements between mask openings on the mask, preventing uncontrollable deformation or breakage of the mask during the screen stretching process. Simultaneously, the spacing between the light-emitting areas of the same color sub-pixel can be reduced, which helps to increase the pixel aperture ratio and improve device lifespan.

[0164] Figure 15 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 16 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 15.

[0165] Referring to Figures 15 and 16, in some examples, the light-emitting areas of the two pixel groups in the repeating unit 100 are mirror-symmetrical with respect to an axis of symmetry AX1 extending along the first direction X. For example, the axis of symmetry AX1 may be located between pixel group 110 and pixel group 120, and the light-emitting areas in pixel group 110 and pixel group 120 may be mirror-symmetrical with respect to the axis of symmetry AX1. For example, the light-emitting areas of the first color sub-pixel 101 in pixel group 110 and the first color sub-pixel 101 in pixel group 120 may extend in different directions, and their extension directions intersect the first direction and the second direction, respectively. For example, the angle between the extension direction of the light-emitting area of ​​the first color sub-pixel 101 in pixel group 110 and the first direction is 135 degrees, and the angle between the extension direction of the light-emitting area of ​​the first color sub-pixel 101 in pixel group 120 and the first direction is 45 degrees.

[0166] Referring to Figures 15 and 16, the two second light-emitting regions Z2 of the second color sub-pixel 1021 in pixel group 110 and the second color sub-pixel 1021 in pixel group 120 are close to each other, so that the light-emitting layers in these two second light-emitting regions Z2 can be formed by the same second mask opening 902. For example, the two third light-emitting regions Z3 of the third color sub-pixel 103 in pixel group 110 and the third color sub-pixel 103 in pixel group 120 are close to each other, so that the light-emitting layers in these two third light-emitting regions Z3 can be formed by the same third mask opening 903.

[0167] However, this disclosure is not limited to this. For example, a third light-emitting layer in the third light-emitting area of ​​a third color sub-pixel can also be formed by a third mask opening.

[0168] Referring to Figure 15, in some examples, on a reference plane perpendicular to the first direction X, the size H2 of the orthographic projection of the light-emitting area of ​​the second color sub-pixel 1021 onto the second direction Y is not less than the size H1 of the orthographic projection of the light-emitting area of ​​the first color sub-pixel 101 onto the second direction Y. For example, size H2 can be equal to size H1. For example, size H2 can be greater than size H1. For example, compared to the pixel arrangement shown in Figure 13, the area of ​​the light-emitting area of ​​the second color sub-pixel is increased in the pixel arrangement shown in Figure 15, which is beneficial to improving the brightness of the displayed image and enhancing color accuracy and richness. In addition, in the pixel arrangement shown in Figure 15, the light-emitting areas of the sub-pixels can be closely arranged, which is beneficial to improving optical utilization and achieving higher pixel density.

[0169] For example, the light-emitting areas of the first and second color sub-pixels can each include one or more flat or rounded chamfers. For example, the shape of the first light-emitting area can be approximately a rounded rectangle. For example, the shape of the second light-emitting area, including flat or rounded chamfers, can be pentagonal, and the overall shape can be approximately triangular, thereby maximizing the area of ​​the light-emitting area of ​​the second color sub-pixel. For example, the area between pixel group 110 and pixel group 120 shown in Figure 15 that is not covered by the light-emitting area can be used to arrange vias, adapter holes, and other connecting parts, which helps to improve the flatness of the first electrode.

[0170] For example, the relative positional relationship of sub-pixels of different colors in each repeating unit can be changed. For instance, in multiple repeating units, multiple groups of pixels arranged along the first direction can be divided into a row of pixels, and adjacent rows of pixels can be aligned or staggered. This disclosure does not impose any limitations on this.

[0171] Figure 17 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 18 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 17.

[0172] Referring to Figure 17, in some examples, the multiple repeating units 100 are divided into a fourth sub-pixel column C4, a fifth sub-pixel column C5, and a sixth sub-pixel column C6, which are arranged sequentially along a first direction X and extend along a second direction Y, respectively. The fourth sub-pixel column C4 and the sixth sub-pixel column C6 each include multiple first-color sub-pixels 101 and multiple third-color sub-pixels 103 arranged alternately in the second direction Y, and the fifth sub-pixel column C5 includes multiple second-color sub-pixel pairs 102 arranged in the second direction Y.

[0173] For example, the first color subpixel has the smallest luminous area, while the third color subpixel has the largest. The larger luminous area of ​​the third color subpixel can compensate for its insufficient luminous efficiency, extend the device's lifespan, and maintain color balance. Setting the third color subpixel to be in the same column as the first color subpixel can increase the total luminous area of ​​the second color subpixel, which is beneficial for optimizing the overall display effect.

[0174] Referring to Figures 17 and 18, in some examples, in each repeating unit 100, the light-emitting layers within the second light-emitting regions Z2 of two second-color sub-pixel pairs 102 of two pixel groups (e.g., pixel group 110 and pixel group 120) are configured to be formed by the same second mask opening 902. This reduces the solid material portion in the mask, which helps meet the minimum spacing requirements between mask openings and prevents uncontrolled deformation or breakage of the mask during screen stretching. Simultaneously, the spacing between the second light-emitting regions Z2 of two adjacent second-color sub-pixels 1021 can be reduced, which helps increase the pixel aperture ratio and improve device lifetime.

[0175] Referring to Figures 17 and 18, in some examples, the first emitting region Z1 of the first color sub-pixel 101 and the third emitting region Z3 of the third color sub-pixel 103 both extend along the second direction Y. For example, both the first emitting region Z1 and the third emitting region Z3 are elongated as shown in Figure 17. For example, a first mask opening 901 can form a light-emitting layer within a first emitting region Z1, and a third mask opening 903 can form a light-emitting layer within a third emitting region Z3.

[0176] Referring to Figures 17 and 18, the size d11 of the second emitting area Z2 of the second color sub-pixel 1021 in the second color sub-pixel pair 102 in the first direction X is not less than the size d12 in the second direction Y. For example, the size d11 can be equal to the size d12, such as when the shape of the second emitting area is a square. For example, the size d11 can be larger than the size d12, such as when the shape of the second emitting area is a rectangle. For example, when the shape of the second emitting area includes a chamfer, such as a flat chamfer or a rounded chamfer, the size d11 can be the maximum size of the second emitting area in the first direction, and the size d12 can be the maximum size of the second emitting area in the second direction.

[0177] Referring to Figures 17 and 18, by setting the size of the second light-emitting area Z2, the space between the fourth sub-pixel column C4 and the sixth sub-pixel column C6 can be fully utilized, increasing the pixel aperture ratio. Simultaneously, the width (e.g., the dimension of the solid portion in the first direction X) between two adjacent first mask openings 901 in the first mask 910 can be increased, improving the strength of the first mask 910. Similarly, the width of the solid portion between two adjacent third mask openings 903 in the first direction X in the third mask 930 can be increased, improving the strength of the third mask 930.

[0178] Referring to Figures 17 and 18, in some examples, on a reference plane perpendicular to the first direction X, the first emitting area Z1 of the first color sub-pixel 101 of the fourth sub-pixel column C4 at least partially overlaps with the third emitting area Z3 of the third color sub-pixel 103 of the sixth sub-pixel column C6. For example, sub-pixels of the same color located in the fourth and sixth sub-pixel columns are staggered from each other, thereby easily meeting the minimum spacing requirement between two adjacent mask openings on the same mask, which is beneficial for increasing the pixel aperture ratio.

[0179] For example, referring to Figure 17, on a reference plane perpendicular to the first direction X, the orthographic projection of the first light-emitting area Z1 and the orthographic projection of the third light-emitting area Z3 may partially overlap and partially not overlap. For example, on the reference plane perpendicular to the first direction X, the edges of the orthographic projections of the first light-emitting area Z1 and the third light-emitting area Z3 may coincide, such as an edge of the first light-emitting area Z1 in the second direction Y being on the same straight line as an edge of the third light-emitting area Z3 in the second direction Y.

[0180] Figure 19 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 20 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 19.

[0181] The difference between the pixel arrangement diagram shown in Figure 19 and the pixel arrangement diagram shown in Figure 17 is that the shape of the light-emitting area in Figure 19 is different from that in Figure 17. The difference between the mask assembly diagram shown in Figure 20 and the mask assembly diagram shown in Figure 18 is that the mask opening shape of each mask in the mask assembly in Figure 19 is different from that in the mask assembly in Figure 18.

[0182] Referring to Figures 18 and 19, the apex corner of the emitting area of ​​at least one of the first color sub-pixel 101, the second color sub-pixel 1021, and the third color sub-pixel 103 includes a rounded chamfer or a flat chamfer. For example, the apex corner of the first emitting area Z1 of the first color sub-pixel 101 may include a rounded chamfer or a flat chamfer. For example, the apex corner of the second emitting area Z2 of the second color sub-pixel 1021 may include a rounded chamfer or a flat chamfer. For example, the apex corner of the third emitting area Z3 of the third color sub-pixel 103 may include a rounded chamfer or a flat chamfer. For example, when the apex corner of the first emitting area Z1 of the first color sub-pixel 101 includes a rounded chamfer (or a flat chamfer), the first mask opening 901 of the first mask plate 910 may also correspondingly include a rounded chamfer (or a flat chamfer). For example, when the apex corner of the second emitting area Z2 of the second color sub-pixel 1021 includes a rounded chamfer (or a flat chamfer), the second mask opening 902 of the second mask plate 920 may also correspondingly include a rounded chamfer (or a flat chamfer). For example, if the apex of the third light-emitting area Z3 of the third color sub-pixel 103 includes a rounded chamfer (or a flat chamfer), the third mask opening 903 of the third mask plate 930 may also correspondingly include a rounded chamfer (or a flat chamfer). For details regarding rounded and flat chamfers, please refer to the descriptions in the foregoing embodiments; these will not be repeated here.

[0183] For example, in the pixel arrangement shown in Figure 17, the pixel pitch is 96 micrometers, and the spacing between pixel apertures is 20 micrometers. In the masks used to form the emitting areas of the first color sub-pixels and the masks used to form the emitting areas of the third color sub-pixels, the spacing between two adjacent mask apertures on the same mask meets the minimum spacing requirement. In the mask used to form the emitting areas of the second color sub-pixels, the distance between two adjacent mask apertures is 35 micrometers. The aperture ratio of the first, second, and third color sub-pixels is 1:1.4:2.2, the pixel aperture area percentage of the first color sub-pixels is 7.4%, the pixel aperture area percentage of the second color sub-pixels is 13.3%, and the pixel aperture area percentage of the third color sub-pixels is 20.7%, with an overall pixel aperture ratio of 41.4%. Compared to the pixel arrangement shown in Figure 1A, the pixel aperture ratio can be increased by approximately 117.9%, and compared to the pixel arrangement shown in Figure 1B, the pixel aperture ratio can be increased by approximately 27.0%.

[0184] Figure 21 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 22 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 21.

[0185] Referring to Figure 21, the display substrate includes a substrate 10 and a plurality of pixel groups 100. The plurality of pixel groups 100 are located on the substrate 10. Each pixel group 100 includes a first color sub-pixel 101, a second color sub-pixel pair 102, and a third color sub-pixel 103 arranged along a first direction X. The second color sub-pixel pair 102 includes two second color sub-pixels 1021 arranged along a second direction Y, where the first direction X intersects the second direction Y. The light-emitting area Z3 of the third color sub-pixel 103 has a size LB1 in the first direction X that is not less than a size LB2 in the second direction Y. For example, size LB1 can be greater than or equal to size LB2. For example, size LB1 can be equal to size LB2.

[0186] The size of the light-emitting area of ​​the third color sub-pixel in the first direction is not less than the size in the second direction, so that the size of the mask opening in the light-emitting layer within the light-emitting area of ​​the third color sub-pixel in the first direction is not less than the size in the second direction. This makes it easier to meet the minimum spacing requirement between two adjacent mask openings, and the pixel aperture ratio can be increased. Furthermore, during the screen stretching process, the mask can be stretched either along the second direction or the first direction, thereby improving the utilization rate of the glass substrate during the fabrication of the display substrate.

[0187] Referring to Figures 21 and 22, for example, the third mask opening 903 in the third mask 930 is used to form the light-emitting layer within the third light-emitting region Z3 of the third color sub-pixel 103. The size of the third mask opening 903 in the first direction X is not less than its size in the second direction Y. This facilitates meeting the minimum spacing requirement between two adjacent third mask openings 903 of the third mask 930, allowing for an increase in pixel aperture ratio. During the screen stretching process, the third mask 930 can be stretched either along the second direction Y or the first direction X, thereby improving the utilization rate of the glass substrate during the fabrication of the display substrate.

[0188] For example, the shape of the light-emitting area Z3 of the third color sub-pixel 103 can extend along the first direction X. The third mask opening 903 can extend along the first direction X.

[0189] Referring to Figures 21 and 22, in some examples, the shape of the light-emitting area of ​​at least one of the first color sub-pixel 101, the second color sub-pixel 1021, and the third color sub-pixel 103 includes a quadrilateral shape. Compared with the pixel arrangement shown in Figure 1A, setting the shape of the light-emitting area of ​​the sub-pixel to a quadrilateral can increase the pixel aperture ratio.

[0190] Referring to Figures 21 and 22, in some examples, the first light-emitting region Z1 of the first color sub-pixel 101 extends along the second direction Y. The extension direction of the first light-emitting region Z1 is the same as the arrangement direction of the two second color sub-pixels 1021 in the second color sub-pixel pair 102, which helps to increase the pixel aperture ratio.

[0191] Referring to Figures 21 and 22, in some examples, the center line LG0 extending along the second direction Y of the second luminous area Z2 of the second color sub-pixel 1021 passes through the luminous areas of other color sub-pixels. For example, referring to Figure 21, the center line LG0 passes through the third luminous area Z3 of the third color sub-pixel 103. However, this disclosure is not limited to this; for example, the center line extending along the second direction of the second luminous area may also pass through the first luminous area of ​​the first color sub-pixel.

[0192] For example, in the pixel arrangement shown in Figure 21, the pixel pitch is 96 micrometers, and the spacing between pixel openings is 20 micrometers. The distance between two adjacent light-emitting areas within the same mask opening can be less than or equal to 10 micrometers. In the mask used to form the light-emitting area of ​​the first color sub-pixel and the mask used to form the light-emitting area of ​​the second color sub-pixel, the spacing between two adjacent mask openings in the same mask can meet the minimum spacing requirement. In the mask used to form the light-emitting area of ​​the third color sub-pixel, the distance between two adjacent mask openings is greater than or equal to 20 micrometers, such as 21 micrometers in this embodiment. The opening ratio of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel is 1:1.4:2.2, the pixel opening area ratio of the first color sub-pixel is 9.6%, the pixel opening area ratio of the second color sub-pixel is 13.4%, the pixel opening area ratio of the third color sub-pixel is 21.0%, and the overall pixel opening rate is 44.0%. Compared with the pixel arrangement shown in Figure 1A, the pixel aperture ratio can be increased by approximately 131.6%, and compared with the pixel arrangement shown in Figure 1B, the pixel aperture ratio can be increased by approximately 35.0%.

[0193] Figure 23 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 24 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 23.

[0194] As shown in Figures 23 and 24, in some examples, the apex corner O of the light-emitting area of ​​at least one of the first color sub-pixel 101, the second color sub-pixel 1021, and the third color sub-pixel 103 includes a rounded chamfer or a flat chamfer. Correspondingly, the apex corners of the first mask opening 901 of the first mask plate 910, the second mask opening 902 of the second mask plate 920, and the third mask opening 903 of the third mask plate 930 may also include rounded chamfers or flat chamfers. For details regarding rounded and flat chamfers, please refer to the descriptions in the foregoing embodiments; further details will not be repeated here.

[0195] Figure 25 is a schematic diagram of the top corner of the mask opening, including the flat chamfer.

[0196] The dashed lines in Figure 25 schematically illustrate the rectangular mask opening 9031 and the corresponding light-emitting area Z01. The solid lines schematically illustrate the octagonal mask opening 9032, which includes four chamfered corners, and the corresponding light-emitting area Z02. For example, the octagonal mask opening 9032 shown in Figure 25 can be similar in shape to the third mask opening 903 shown in Figure 24, and the light-emitting area Z02 shown in Figure 25 can be similar in shape to the third light-emitting area Z3 shown in Figure 23.

[0197] As shown in Figure 25, compared to the rectangular light-emitting area Z01, the octagonal light-emitting area Z02 has a larger area, which is beneficial for increasing the pixel aperture ratio. Furthermore, when the mask opening 9032 includes a flat chamfer, the minimum spacing between two adjacent mask openings is an upward-sloping spacing, which is the direction intersecting the first direction X and the second direction Y, respectively. Therefore, the minimum spacing LF2 between two adjacent mask openings 9032 is greater than the minimum spacing LF1 between two adjacent mask openings 9031.

[0198] For example, referring to Figures 23 to 25, the four apex corners of the third emitting area Z3 of the third color sub-pixel 103 include flat chamfers. The angle between the extension direction of the chamfered line segment and the first direction X is 45 degrees, and the length of the line segment is 6 micrometers. For example, compared to a rectangular mask opening, the size of the emitting area shown in Figure 25 in the second direction Y can be increased by 12 micrometers, thereby significantly improving the pixel aperture ratio. As shown in Figures 24 and 22, compared to a rectangular mask opening, the spacing between two adjacent mask openings including flat chamfers can be increased from 21 micrometers to 24.5 micrometers.

[0199] Therefore, setting the apex corners of the light-emitting area to include flat chamfers or rounded chamfers, and the apex corners of the mask openings to include flat chamfers or rounded chamfers, helps to meet the minimum spacing requirements between the mask openings of the mask plate, preventing uncontrollable deformation or breakage of the mask plate during the screen stretching process. Simultaneously, the spacing between the light-emitting areas of sub-pixels of the same color can be reduced, which helps to increase the pixel aperture ratio and improve device lifespan. It is understood that the embodiments of this disclosure are not limited to the flat chamfers shown in Figures 23 to 25; rounded chamfers can also be used, which will not be elaborated further here.

[0200] Referring to Figure 23, in some examples, multiple pixel groups 100 are divided into multiple pixel rows R0, which include a first pixel row R1 and a second pixel row R2 arranged alternately in the second direction Y. Both the first pixel row R1 and the second pixel row R2 extend along the first direction X. On a reference plane perpendicular to the second direction Y, the orthographic projection of the light-emitting area Z1 of the first color sub-pixel 101 in the first pixel row R1 overlaps with the orthographic projection of the light-emitting area Z3 of the third color sub-pixel 103 in the second pixel row R2. This improves color accuracy and results in a more uniform display effect.

[0201] Figure 26 is a schematic diagram of pixel arrangement provided in one example of at least one embodiment of the present disclosure. Figure 27 is a schematic diagram of a mask assembly for forming the display substrate shown in Figure 26.

[0202] As shown in Figures 26 and 27, in some examples, the shape of the light-emitting area of ​​at least one of the first color sub-pixel 101, the second color sub-pixel 1021, and the third color sub-pixel 103 includes an arcuate edge CE. For example, the shape of the light-emitting area Z1 of the first color sub-pixel 101 includes an arcuate edge. For example, the shape of the light-emitting area Z2 of the second color sub-pixel 1021 includes an arcuate edge. For example, the shape of the light-emitting area Z3 of the third color sub-pixel 103 includes an arcuate edge. Referring to Figure 27, by setting the shape of the light-emitting area to include an arcuate edge, the shape of the mask openings (e.g., the first mask opening 901, the second mask opening 902, and the third mask opening 903) corresponding to the light-emitting area also includes an arcuate edge. Therefore, during the mask sheet tensioning process, the force on the mask openings can be uniformly diffused, improving the evaporation accuracy and extending the lifespan of the mask sheet.

[0203] As shown in Figures 26 and 27, in some examples, the shape of the light-emitting area Z1 of the first color sub-pixel 101 includes an elongated strip extending along the second direction Y, with an arcuate edge EC located on at least one side of the elongated strip in the second direction Y. For example, the arcuate edge may be located on one side of the elongated strip in the second direction. For example, the arcuate edge may be located on both sides of the elongated strip in the second direction.

[0204] As shown in Figure 26, the shape of the light-emitting area of ​​at least one of the second color sub-pixel 1021 and the third color sub-pixel 103 includes a circle or an ellipse. For example, the shape of the light-emitting area Z2 of the second color sub-pixel 1021 can be a circle or an ellipse. For example, the shape of the light-emitting area Z3 of the third color sub-pixel 103 can be a circle or an ellipse. For example, compared to rectangular or other polygonal light-emitting areas, a circular light-emitting area is advantageous for increasing the opening area.

[0205] As shown in Figures 26 and 27, for example, the first mask opening 901 can be elongated, and the elongated shape includes curved edges on both sides in the second direction. For example, the second mask opening 902 can simultaneously form the light-emitting layer within the light-emitting area Z2 of two second color sub-pixels 1021, and the shape of the second mask opening 902 can be a rounded rectangle. For example, the shape of the third mask opening 903 can be circular.

[0206] This disclosure also provides a display device, including the display substrate described in the above embodiments. Since the display device according to this disclosure includes the display substrate described in the above embodiments, it also has corresponding beneficial technical effects, which will not be elaborated upon here.

[0207] For example, the display device can be an AMOLED display device or other display device, as well as any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator that includes the display device. This embodiment is not limited to this.

[0208] The following points need to be explained:

[0209] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0210] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure may be combined with each other.

[0211] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit the scope of protection of this disclosure, which is determined by the appended claims.

Claims

1. A display substrate, comprising: Substrate; Multiple repeating units are arrayed on the substrate along a first direction and a second direction; each repeating unit includes two pixel groups, each pixel group includes a first color sub-pixel, a second color sub-pixel pair and a third color sub-pixel; the second color sub-pixel pair includes two second color sub-pixels; each sub-pixel includes a first electrode, a light-emitting layer and a second electrode stacked sequentially, the first electrode being located between the light-emitting layer and the substrate. In two pixel groups within the same repeating unit, the display substrate is configured to satisfy one of the following conditions: The light-emitting layers of the first color sub-pixels located in different pixel groups are configured to be formed by the same mask opening; The light-emitting layers of the second color sub-pixels located in different pixel groups are configured to be formed by the same mask opening; The light-emitting layers of the third color subpixels located in different pixel groups are configured to be formed by the same mask opening. 2.The display substrate of claim 1, wherein, The light-emitting areas of the two pixel groups in the same repeating unit are centrally symmetrically distributed. 3.The display substrate of claim 1, wherein, The light-emitting areas of the two pixel groups in the same repeating unit are mirror-symmetric with respect to at least one of the axes of symmetry extending along the first direction and the axis of symmetry extending along the second direction. 4.The display substrate of claim 3, wherein, The plurality of repeating units include a first repeating unit and a second repeating unit that are adjacent in the first direction, wherein the light-emitting layer of the first color sub-pixel of the first repeating unit and the light-emitting layer of the first color sub-pixel of the second repeating unit are configured to be formed by the same mask opening. 5.The display substrate according to claim 3 or 4, wherein, The plurality of repeating units includes four repeating units arranged in an array along the first direction and the second direction, wherein the light-emitting layers of four adjacent second color sub-pixels are configured to be formed by the same mask opening. 6.The display substrate of claim 1, wherein, In two pixel groups within the same repeating unit, the display substrate is configured to satisfy two of the following conditions: The light-emitting layers of the first color sub-pixels located in different pixel groups are configured to be formed by the same mask opening; The light-emitting layers of the second color sub-pixels located in different pixel groups are configured to be formed by the same mask opening; The light-emitting layers of the third color subpixels located in different pixel groups are configured to be formed by the same mask opening. 7.The display substrate of claim 1, wherein, In the same repeating unit, the light-emitting areas of the sub-pixels of the two pixel groups are arranged in the same way. 8.The display substrate of claim 7, wherein, In the same repeating unit, the two pixel groups are arranged in the second direction, and the light-emitting layers of the third color sub-pixels arranged in the second direction in the two pixel groups are configured to be formed by the same mask opening. 9.The display substrate of claim 1, wherein, In the same repeating unit, the arrangement of the light-emitting areas of the sub-pixels of the two pixel groups is different. 10.The display substrate of claim 1, wherein, The plurality of repeating units are divided into a first sub-pixel column, a second sub-pixel column, and a third sub-pixel column, which are arranged sequentially along the first direction and all extend along the second direction; The first sub-pixel column and the third sub-pixel column respectively include a first color sub-pixel and a second color sub-pixel, and there are two second color sub-pixels arranged in the second direction between two first color sub-pixels arranged in the second direction. The second sub-pixel column includes a plurality of third color sub-pixels arranged in the second direction. 11.The display substrate of claim 10, wherein, The light-emitting layers of the third color sub-pixels of the two pixel groups of the same repeating unit are configured to be formed using the same mask opening; On a reference plane perpendicular to the first direction, the orthographic projections of the luminous areas of the third color sub-pixels of the two pixel groups overlap with the orthographic projections of the luminous areas of the same first color sub-pixel. 12.The display substrate of claim 11, wherein, The apex corner of the luminous region of at least one of the first color sub-pixel and the second color sub-pixel includes a rounded chamfer or a flat chamfer. 13.The display substrate of claim 12, wherein, The shapes of the light-emitting areas of the two second-color sub-pixels in the second-color sub-pixel pair are different. 14.The display substrate according to claim 12 or 13, wherein The edges of the luminescent areas in two first color subpixels, which are located in adjacent first and third subpixel columns and are close to each other, are parallel to each other. 15.The display substrate according to any one of claims 12-14, wherein, The edges of the luminescent areas in two adjacent second color subpixels, located in the first and third subpixel columns respectively, are parallel to each other. 16.The display substrate according to any one of claims 12-15, wherein, Two second color sub-pixels formed by the same mask opening have a first edge and a second edge respectively disposed opposite to each other in the first direction, the two first edges of the two second color sub-pixels are on a straight line, and the two second edges of the two second color sub-pixels are on a straight line. 17.The display substrate of claim 16, wherein, The extension directions of the two first edges intersect the extension directions of the two second edges. 18.The display substrate of claim 10, wherein, Both the first sub-pixel column and the third sub-pixel column include two sub-columns, the two sub-columns being a first sub-column and a second sub-column, the first sub-column and the second sub-column being arranged along the first direction and both extending along the second direction; The arrangement of the light-emitting areas of the sub-pixels in the first sub-column is the same as that in the second sub-column.

19. The display substrate of claim 18, wherein, The light-emitting layer of the first color sub-pixel in the first sub-column and the light-emitting layer of the first color sub-pixel in the second sub-column are configured to be formed by the same mask opening, and the light-emitting layer of the second color sub-pixel in the first sub-column and the light-emitting layer of the second color sub-pixel in the second sub-column are configured to be formed by the same mask opening. 20.The display substrate of claim 1, wherein, The plurality of repeating units are divided into a fourth sub-pixel column, a fifth sub-pixel column, and a sixth sub-pixel column arranged sequentially along the first direction and extending along the second direction respectively; The fourth sub-pixel column and the sixth sub-pixel column each include a plurality of first-color sub-pixels and a plurality of third-color sub-pixels arranged alternately in the second direction, and the fifth sub-pixel column includes a plurality of second-color sub-pixel pairs arranged in the second direction. 21.The display substrate of claim 20, wherein, In each of the repeating units, the light-emitting layers of the two second color sub-pixel pairs of the two pixel groups are configured to be formed by the same mask opening.

22. The display substrate of claim 20 or 21, wherein, The light-emitting areas of the first color sub-pixel and the third color sub-pixel both extend along the second direction, and the size of the light-emitting area of ​​the second color sub-pixel in the second color sub-pixel pair in the first direction is not less than the size in the second direction.

23. The display substrate of any of claims 20-22, wherein, On a reference plane perpendicular to the first direction, the light-emitting area of ​​the first color sub-pixel of the fourth sub-pixel column at least partially overlaps with the light-emitting area of ​​the third color sub-pixel of the sixth sub-pixel column. 24.The display substrate of claim 1, wherein, The light-emitting area of ​​at least one color sub-pixel extends along a third direction, which intersects the first direction and the second direction respectively.

25. The display substrate according to claim 24, wherein, The plurality of repeating units are divided into a plurality of seventh sub-pixel columns and a plurality of eighth sub-pixel columns that are alternately arranged along the first direction and extend along the second direction respectively; Each repeating unit includes a pair of first and second color sub-pixels located in the seventh sub-pixel column, and a third color sub-pixel located in the eighth sub-pixel column; In each repeating unit, the center line connecting the light-emitting areas of the two second color sub-pixels in the second color sub-pixel pair passes through the first color sub-pixel, and the center line intersects the first direction and the second direction respectively. 26.The display substrate of claim 25, wherein, In the second color sub-pixel pair, the edges of the light-emitting areas of the two second color sub-pixels that are close to each other are parallel.

27. The display substrate according to claim 25 or 26, wherein, On a reference plane perpendicular to the first direction, the size of the orthographic projection of the light-emitting area of ​​the second color sub-pixel in the second direction is not less than the size of the orthographic projection of the light-emitting area of ​​the first color sub-pixel in the second direction.

28. The display substrate according to claim 27, wherein, The light-emitting area of ​​the first color sub-pixel extends along the third direction, and the center line intersects with the third direction.

29. The display substrate according to any one of claims 25-28, wherein, The apex corner of the luminous region of at least one of the first color sub-pixel and the second color sub-pixel includes a rounded chamfer or a flat chamfer.

30. A display substrate, comprising: Substrate; Multiple pixel groups are located on the substrate; each pixel group includes a first color sub-pixel, a second color sub-pixel pair, and a third color sub-pixel arranged along a first direction; the second color sub-pixel pair includes two second color sub-pixels arranged along a second direction, the first direction intersecting the second direction; Wherein, the size of the light-emitting area of ​​the third color sub-pixel in the first direction is not less than its size in the second direction.

31. The display substrate according to claim 30, wherein, The light-emitting area of ​​the first color sub-pixel extends along the second direction.

32. The display substrate according to claim 30 or 31, wherein, The center line of the light-emitting area of ​​the second color sub-pixel extending along the second direction passes through the light-emitting areas of other color sub-pixels.

33. The display substrate according to any one of claims 30-32, wherein, The shape of the light-emitting area of ​​at least one of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel includes a quadrilateral.

34. The display substrate according to claim 33, wherein, The apex corner of the light-emitting area of ​​at least one of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel includes a rounded chamfer or a flat chamfer.

35. The display substrate according to any one of claims 30-34, wherein, The plurality of pixel groups are divided into a plurality of pixel rows, the plurality of pixel rows including a first pixel row and a second pixel row that are alternately arranged in the second direction; both the first pixel row and the second pixel row extend along the first direction. On a reference plane perpendicular to the second direction, the orthographic projection of the luminous area of ​​the first color sub-pixel in the first pixel row overlaps with the orthographic projection of the luminous area of ​​the third color sub-pixel in the second pixel row.

36. The display substrate according to claim 30, wherein, The shape of the light-emitting area of ​​at least one of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel includes an arc-shaped edge.

37. The display substrate according to claim 36, wherein, The shape of the light-emitting area of ​​the first color sub-pixel includes an elongated strip extending along the second direction, and the arcuate edge is located on at least one side of the elongated strip in the second direction; The shape of the light-emitting area of ​​at least one of the second color sub-pixel and the third color sub-pixel includes a circle or an ellipse.

38. A display device comprising the display substrate according to any one of claims 1-37.

39. A mask assembly for fabricating a display substrate according to any one of claims 1-37, comprising: A first mask plate includes a plurality of first mask openings, the plurality of first mask openings being configured to form a light-emitting layer for a plurality of first color sub-pixels; The second mask includes a plurality of second mask openings, the plurality of second mask openings being configured to form a light-emitting layer for a plurality of second color sub-pixels; The third mask includes a plurality of third mask openings, which are configured to form a light-emitting layer for a plurality of the third color sub-pixels; Wherein, at least one of the first mask opening, the second mask opening, and the third mask opening has a rounded chamfer or a flat chamfer at its apex.

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