Display substrate, display panel and spliced display device

Abstract

The application provides a display substrate, a display panel and a spliced display device, and relates to the technical field of display. The display area of the display substrate comprises a middle area and an edge area surrounding the middle area. The middle area comprises a plurality of first pixel units arranged in an array, and the edge area comprises a plurality of second pixel units. At least one row of second pixel units is arranged along the side edge of the display substrate. The area of the light-emitting area of the second pixel unit is greater than the area of the light-emitting area of the first pixel unit. The display substrate comprises a first conductive layer comprising a plurality of anodes. Each pixel unit comprises a plurality of sub-pixels. For sub-pixels of the same color, the area of the orthographic projection of the anode of the sub-pixel located in the edge area on the substrate is greater than the area of the orthographic projection of the anode of the sub-pixel located in the middle area on the substrate. The spliced display device can prolong the service life of the spliced display device and improve the display effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display substrate, a display panel and a spliced display device. BACKGROUND

[0002] With the continuous development of display technology, the organic light emitting diode display device (OLED) has become the research focus and the direction of technical development of major manufacturers due to its wide color gamut, high contrast, thin design, self-luminous and wide viewing angle.

[0003] At present, for the OLED spliced display device, due to the existence of the splicing seam, the splicing seam position causes the splitting feeling to the display picture, which greatly reduces the display effect. SUMMARY

[0004] Embodiments of the present application adopt the following technical solutions:

[0005] In a first aspect, embodiments of the present application provide a display substrate, comprising: a display area;

[0006] The display area comprises a middle area and an edge area surrounding the middle area, the middle area comprises a plurality of first pixel units arranged in an array, and the edge area comprises a plurality of second pixel units, at least one row of the second pixel units being arranged along a side edge of the display substrate;

[0007] The area of the light emitting area of the second pixel unit is greater than the area of the light emitting area of the first pixel unit.

[0008] The display substrate comprises a substrate and a first conductive layer on the substrate, the first conductive layer comprises a plurality of anodes, each pixel unit comprises a plurality of sub-pixels, and for the sub-pixels of the same color, the area of the orthographic projection of the anode of the sub-pixel located in the edge area on the substrate is greater than the area of the orthographic projection of the anode of the sub-pixel located in the middle area on the substrate.

[0009] In the display substrate provided by the embodiments of the present application, the display substrate comprises a first side edge, a second side edge, a third side edge and a fourth side edge connected in sequence, and at least one row of the second pixel units is arranged along at least one of the first side edge, the second side edge, the third side edge and the fourth side edge.

[0010] In the display substrate provided by the embodiments of the present application, the display substrate further comprises a pixel definition layer, the pixel definition layer comprises a plurality of first openings and a plurality of second openings, the first openings are located in the middle area, and the second openings are located in the edge area.

[0011] An area circumscribed by a normal projection of an outer contour of the first opening on the substrate overlaps a normal projection of the anode of the sub-pixel located in the middle region on the substrate, and an area circumscribed by a normal projection of an outer contour of the second opening on the substrate overlaps a normal projection of the anode of the sub-pixel located in the edge region on the substrate;

[0012] For the same color of the sub-pixel, an area of a normal projection pattern of the outer contour of the first opening on the substrate is less than an area of a normal projection pattern of the outer contour of the second opening on the substrate.

[0013] In an embodiment of the present application, the first conductive layer further includes a plurality of connection electrodes, a normal projection of the connection electrode on the substrate does not overlap a normal projection of the pixel unit on the substrate, and the connection electrode is electrically connected to the anode.

[0014] The pixel definition layer includes a plurality of third openings, an area circumscribed by a normal projection of an outer contour of the third opening on the substrate overlaps a normal projection of the connection electrode on the substrate, and the number of the third openings is the same as the number of the connection electrodes.

[0015] The connection electrode is located at least in the middle region.

[0016] In an embodiment of the present application, part of the connection electrodes are located in the middle region, and part of the connection electrodes are located in the edge region; wherein the distribution density of the connection electrodes located in the middle region is greater than the distribution density of the connection electrodes located in the edge region.

[0017] In an embodiment of the present application, part of the connection electrodes are located in the middle region, and part of the connection electrodes are located in the edge region; wherein the number of the connection electrodes located in the middle region is greater than the number of the connection electrodes located in the edge region.

[0018] In an embodiment of the present application, each of the sub-pixels includes a light-emitting functional layer, and the light-emitting functional layer is located on a side of the anode away from the substrate.

[0019] For the same color of the sub-pixel, an area of a normal projection pattern of the light-emitting functional layer in the edge region on the substrate is greater than an area of a normal projection pattern of the light-emitting functional layer in the middle region on the substrate.

[0020] In an embodiment of the present application, the light-emitting functional layer includes a light-emitting sub-layer and a functional sub-layer.

[0021] The area of the orthographic projection of the light-emitting sublayer of the edge region on the substrate is equal to the area of the orthographic projection of the light-emitting sublayer of the middle region on the substrate, and the area of the orthographic projection of the functional sublayer of the edge region on the substrate is greater than the area of the orthographic projection of the functional sublayer of the middle region on the substrate.

[0022] In an embodiment of the display substrate provided in the present application,

[0023] In the middle region, for the same subpixel, the orthographic projection of the light-emitting sublayer on the substrate and the orthographic projection of the functional sublayer on the substrate partially overlap.

[0024] In the edge region, for the same subpixel, the orthographic projection of the light-emitting sublayer on the substrate is located within the orthographic projection of the functional sublayer on the substrate.

[0025] In an embodiment of the display substrate provided in the present application,

[0026] In the middle region, the functional sublayers of the subpixels in the same first pixel unit are integrally arranged, and the functional sublayers in adjacent two first pixel units are arranged separately.

[0027] In the edge region, the functional sublayers of the subpixels in the same second pixel unit are integrally arranged, and the functional sublayers in at least two second pixel units are integrally arranged.

[0028] In an embodiment of the display substrate provided in the present application, in the case where the functional sublayers in at least two second pixel units are integrally arranged, the orthographic projection of the integrally arranged functional sublayers on the substrate covers the region between adjacent two second pixel units.

[0029] The orthographic projection of the connecting electrode on the substrate and the orthographic projection of the integrally arranged functional sublayer on the substrate do not overlap each other.

[0030] In an embodiment of the display substrate provided in the present application, the display substrate further comprises a cathode layer, the cathode layer comprises a plurality of cathodes, the plurality of cathodes are in an integrated structure, the cathode layer covers the pixel definition layer, and the cathode layer is in contact with each connecting electrode.

[0031] In an embodiment of the display substrate provided in the present application, the spacing between the light-emitting regions of adjacent two first pixel units is equal, and the spacing between the light-emitting regions of adjacent two second pixel units is equal.

[0032] In the display substrate provided by the embodiments of the present application, the spacing between the light-emitting regions of any two adjacent pixel units is equal.

[0033] In the display substrate provided by the embodiments of the present application, N circles of the second pixel units are arranged along the side edges of the display substrate; the orthographic projection of the display area on the substrate includes a first top corner, a second top corner, a third top corner and a fourth top corner, the functional sub-layers of N*N second pixel units located at the first top corner are integrally arranged, the functional sub-layers of N*N second pixel units located at the second top corner are integrally arranged, the functional sub-layers of N*N second pixel units located at the third top corner are integrally arranged, and the functional sub-layers of N*N second pixel units located at the fourth top corner are integrally arranged; wherein N is greater than or equal to 2.

[0034] In the display substrate provided by the embodiments of the present application, the functional sub-layer includes at least one of a hole injection sub-layer, a hole transport sub-layer, an electron injection sub-layer, an electron transport sub-layer and a charge transport sub-layer.

[0035] In the second aspect, the embodiments of the present application provide a display panel, including the display substrate according to any one of the first aspect.

[0036] In the third aspect, the embodiments of the present application provide a spliced display device, including at least two display panels according to the second aspect.

[0037] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0039] Figure 1 And Figure 2 Structure schematic diagram of the spliced display device in two related technologies provided by the embodiments of the present application;

[0040] Figure 3 Principle schematic diagram of optical seamless splicing of the spliced display device in a related technology provided by the embodiments of the present application;

[0041] Figure 4 A schematic diagram of a top view of a display substrate provided in an embodiment of the present application;

[0042] Figure 5 A schematic top view of a first pixel unit according to an embodiment of the present application;

[0043] Figure 6 A schematic top view of a second pixel unit according to an embodiment of the present application;

[0044] Figure 7 A schematic diagram comparing the structures of a first pixel unit and a second pixel unit provided in an embodiment of the present application;

[0045] Figure 8 for Figure 4 Schematic diagram of the cross-sectional structure along the M1M2 direction;

[0046] Figure 9 A schematic diagram of a top view of an anode layer provided in an embodiment of the present application;

[0047] Figure 10 A schematic diagram of a top view structure of a pixel definition layer provided in an embodiment of the present application

[0048] Figure 11 A schematic diagram of a top view structure of a pixel definition layer and a functional sublayer after being stacked according to an embodiment of the present application;

[0049] Figure 12 A schematic diagram of a top view structure of a pixel definition layer and a light-emitting sub-layer after being stacked according to an embodiment of the present application;

[0050] Figures 13-17 Schematic diagrams of five splicing methods provided in the embodiments of this application. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0052] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as having an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0053] In the embodiments of the present application, words such as "first" and "second" are used to indicate parts of identical or similar items with substantially the same functions and effects only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and shall not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0054] In this specification, "parallel" refers to a state where the angle formed by two straight lines is greater than -10° and less than 10°, and thus also includes a state where the angle is greater than -5° and less than 5°. Furthermore, "perpendicular" refers to a state where the angle formed by two straight lines is greater than 80° and less than 100°, and thus also includes a state where the angle is greater than 85° and less than 95°.

[0055] The polygons in this specification are not in a strict sense, and may be approximate triangles, parallelograms, trapezoids, pentagons or hexagons, etc., and may have some small deformations due to tolerances.

[0056] In this specification, "same layer" refers to the relationship between multiple film layers formed from the same material through the same step (e.g., a patterning process). "Same layer" here does not always mean that the multiple film layers have the same thickness or the same height in the cross-sectional view.

[0057] With the development of industries such as outdoor advertising and indoor education, large-size display products have become an important branch of the display industry. Figure 1As shown in the figure, a typical indoor splicing screen is composed of multiple display screens, for example, multiple LCD (Liquid Crystal Display) screens, or multiple Mini LED (Mini Light Emitting Diode) screens. Among them, LCD screens have large borders and obvious seams, which are not conducive to display. Mini LED screens have huge difficulties and costs in mass transfer processes. Therefore, OLED (Organic Light Emitting Diode) screens can become the first choice for splicing screens.

[0058] like Figure 2 The following is a schematic diagram of the structure of a typical OLED spliced ​​display screen. The spliced ​​display screen is composed of multiple independent displays, and there is a seam between the two spliced ​​screens. The seam area cannot display content, and the size of the seam directly affects the display effect, causing a sense of display fragmentation. Figure 3 As shown, the related art adopts the principle of optical refraction. By arranging curved cover plates (such as cover plate 1 and cover plate 2) on the display screen, a hollow structure similar to a triangular prism is formed at the contact position of the two cover plates. By refracting the light emitted by the pixel units in the edge areas of display screens 1 and 2 to the seam position, the viewer can display the picture at the seam position, thereby improving the problem of the sense of picture fragmentation. Furthermore, in order to improve the brightness uniformity of the spliced ​​display screen, the luminous brightness of the pixel units near the seam position needs to be set higher (for example, the voltage of the anode here is controlled to be higher) to compensate for the brightness at the seam position. In this way, the pixel units in the edge area of ​​the display screen are more damaged, and the life of the display screen is greatly reduced.

[0059] Based on this, an embodiment of the present application provides a display substrate, a display panel and a spliced ​​display device, wherein the display substrate includes: a display area; the display area includes a middle area and an edge area surrounding the middle area, the middle area includes a plurality of first pixel units arranged in an array, the edge area includes a plurality of second pixel units, and at least one row of second pixel units is arranged along the side of the display substrate; wherein the area of ​​the light-emitting area of ​​the second pixel unit is larger than the area of ​​the light-emitting area of ​​the first pixel unit; the display substrate includes: a substrate and a first conductive layer located on the substrate, the first conductive layer includes a plurality of anodes; each pixel unit includes a plurality of sub-pixels, and for sub-pixels of the same color, the area of ​​the positive projection of the anode of the sub-pixel located in the edge area on the substrate is larger than the area of ​​the positive projection of the anode of the sub-pixel located in the middle area on the substrate.

[0060] Thus, by setting the area of the light-emitting region of the second pixel unit in the edge region to be greater than the area of the light-emitting region of the first pixel unit in the middle region, and by setting the area of the normal projection of the anode of the sub-pixel in the edge region on the substrate to be greater than the area of the normal projection of the anode of the sub-pixel in the middle region on the substrate, when the display panel is controlled to display, the brightness of all the pixel units can be set to be the same (for example, the voltage of the anode of all the pixel units is set to be uniform), and because the area of the light-emitting region of the second pixel unit in the edge region is greater than the area of the light-emitting region of the first pixel unit in the middle region, the total light intensity of the second pixel unit is greater than the total light intensity of the first pixel unit, so that when the spliced display device is formed, the second pixel unit in the edge region can maintain the brightness at its own position after compensating for the brightness at the splicing seam position, thereby improving the sense of fragmentation of the picture at the splicing seam position, ensuring the uniformity of the brightness of the spliced display device, and prolonging the service life of the spliced display device and improving the product quality.

[0061] The display substrate, the display panel, and the spliced display device provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0062] The embodiments of the present application provide a display substrate, as shown in Figure 4 The display substrate includes a display area AA.

[0063] The display area AA includes a middle region AA-M and an edge region AA-B surrounding the middle region AA-M, the middle region AA-M includes a plurality of first pixel units P1 arranged in an array, and the edge region AA-B includes a plurality of second pixel units P2, at least one row of second pixel units P2 being arranged along the side of the display substrate.

[0064] The area of the light-emitting region F of the second pixel unit P2 is greater than the area of the light-emitting region F of the first pixel unit P1.

[0065] As shown in Figure 8 and Figure 9 The display substrate includes a substrate and a first conductive layer ANL on the substrate, the first conductive layer ANL includes a plurality of anodes AN, each pixel unit includes a plurality of sub-pixels, and for sub-pixels of the same color, the area of the normal projection of the anode AN of the sub-pixel in the edge region AA-B on the substrate is greater than the area of the normal projection of the anode AN of the sub-pixel in the middle region AA-M on the substrate. Figure 8 As shown in Figure 4 A cross-sectional view in the M1M2 direction.

[0066] The active area (AA) of the display substrate refers to an area for realizing display. The light-emitting area (also referred to as a pixel opening area) refers to an area provided with an OLED unit and actually emitting light. According to the related art, the OLED unit includes an anode, an organic light-emitting functional layer, and a cathode. The non-light-emitting area refers to an area other than the light-emitting area in the active area AA. In the area, a pixel definition and a pixel circuit can be provided. The pixel circuit can include a TFT (Thin Film Transistor), a gate line, a data line, and the like.

[0067] The size of the intermediate area AA-M and the edge area AA-B surrounding the intermediate area AA-M is not limited herein. In the case where the size of the active area AA is determined, the size of the intermediate area AA-M is determined according to the size of the edge area AA-B, and the size of the edge area AA-B is determined according to the size and number of the second pixel units P2. In some embodiments, in the case where the size of the first pixel unit P1 is the same as that of the second pixel unit P2, the size of the edge area AA-B is determined according to the number of the second pixel units P2.

[0068] The edge area AA-B can be an annular area.

[0069] The first pixel unit P1 includes a plurality of sub-pixels, and the second pixel unit P2 includes a plurality of sub-pixels. In some embodiments, the number of sub-pixels included in the first pixel unit P1 is the same as the number of sub-pixels included in the second pixel unit P2. For example, the first pixel unit P1 and the second pixel unit P2 each include three sub-pixels, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In other embodiments, the number of sub-pixels included in the first pixel unit P1 is different from the number of sub-pixels included in the second pixel unit P2. For example, the first pixel unit P1 includes three sub-pixels, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the second pixel unit P2 includes four sub-pixels, such as a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. It should be noted that the number of sub-pixels included in the first pixel unit P1 and the number of sub-pixels included in the second pixel unit P2 are taken as an example for description in the present specification.

[0070] When both the first pixel cell P1 and the second pixel cell P2 include three sub-pixels, for example, a red sub-pixel, a green sub-pixel, and a blue sub-pixel, in some embodiments, the arrangement of the three sub-pixels in the first pixel cell P1 is different from the arrangement of the three sub-pixels in the second pixel cell P2. In some embodiments, the design patterns of the sub-pixels of the same color in the first pixel cell P1 and the second pixel cell P2 are different, for example, the design shapes of the red sub-pixels are different. It should be noted that this specification uses the example of the arrangement of the three sub-pixels in the first pixel cell P1 being the same as the arrangement of the three sub-pixels in the second pixel cell P2, and the design shapes of the sub-pixels of the same color in the first pixel cell P1 and the second pixel cell P2 being the same, but this does not limit the arrangement of the three sub-pixels in the first pixel cell P1 and the arrangement of the three sub-pixels in the second pixel cell P2, nor does it limit the design shapes of the sub-pixels of the same color in the first pixel cell P1 and the second pixel cell P2.

[0071] In the case where the pixel unit includes a plurality of sub-pixels, the light emitting region F of the pixel unit may include a plurality of light emitting sub-regions, wherein the number of the light emitting sub-regions is the same as the number of the sub-pixels.

[0072] The area of ​​the light emitting region F of the second pixel unit P2 is greater than the area of ​​the light emitting region F of the first pixel unit P1, which means that the total area of ​​the light emitting region F of one second pixel unit P2 is greater than the total area of ​​the light emitting region F of one first pixel unit P1.

[0073] Exemplarily, the light-emitting region F includes a light-emitting sub-region F1, a light-emitting sub-region F2, and a light-emitting sub-region F3. The area of ​​the light-emitting sub-region F1 of the second pixel unit P2 is larger than the area of ​​the light-emitting sub-region F1 of the first pixel unit P1, the area of ​​the light-emitting sub-region F2 of the second pixel unit P2 is larger than the area of ​​the light-emitting sub-region F2 of the first pixel unit P1, and the area of ​​the light-emitting sub-region F3 of the second pixel unit P2 is larger than the area of ​​the light-emitting sub-region F3 of the first pixel unit P1. Light-emitting sub-region F1, light-emitting sub-region F2, and light-emitting sub-region F3 correspond to the light-emitting sub-regions of the red sub-pixel, the light-emitting sub-region of the green sub-pixel, and the light-emitting sub-region of the blue sub-pixel, respectively.

[0074] In a display substrate provided in an embodiment of the present application, the area of ​​the planar pattern of the second pixel unit P2 is greater than the area of ​​the planar pattern of the first pixel unit P1. In a display substrate provided in an embodiment of the present application, the area of ​​the planar pattern of the second pixel unit P2 is equal to the area of ​​the planar pattern of the first pixel unit P1. The above-mentioned planar pattern refers to the orthographic projection pattern of the pixel unit on the substrate.

[0075] The at least one row of second pixel units P2 arranged along the side edge of the display substrate includes: one row of second pixel units P2 arranged along the side edge of the display substrate; or two or more rows of second pixel units P2 arranged along the side edge of the display substrate.

[0076] In the case of two or more rows of second pixel units P2 arranged along the side edge of the display substrate, the arrangement direction of the multiple rows of second pixel units P2 is not limited here.

[0077] For example, in the case of two rows of second pixel units P2 arranged along the side edge of the display substrate, the extension directions of the two rows of second pixel units P2 can be the same, such as both rows of second pixel units P2 being arranged along the left side edge of the display substrate; or for example, the two rows of second pixel units P2 are arranged along the left side edge and the right side edge of the display substrate, respectively.

[0078] For example, in the case of two rows of second pixel units P2 arranged along the side edge of the display substrate, the extension directions of the two rows of second pixel units P2 can be different, such as the two rows of second pixel units P2 being arranged along the left side edge and the top side edge of the display substrate, respectively; or for example, the two rows of second pixel units P2 are arranged along the left side edge and the bottom side edge of the display substrate, respectively. Of course, other cases are also possible, which will not be described here.

[0079] In actual applications, the more second pixel units P2 arranged in the edge region AA-B, the greater the total intensity of light of the second pixel units P2 near the seam position, and the better the light compensation effect at the seam position.

[0080] In addition, the number of side edges of the display substrate is not limited here, and is related to the shape of the display substrate. In some embodiments, the shape of the display substrate can be a polygon, such as a quadrilateral, a pentagon, etc.; in some embodiments, the shape of the display substrate can include an arc, such as a combination of a polygon and an arc. The specific shape can be determined according to the design of the display product.

[0081] For example, the area of the normal projection of the anode AN-R of the red sub-pixel of the second pixel unit P2 on the substrate is greater than the area of the normal projection of the anode AN-R of the red sub-pixel of the first pixel unit P1 on the substrate; the area of the normal projection of the anode AN-G of the green sub-pixel of the second pixel unit P2 on the substrate is greater than the area of the normal projection of the anode AN-G of the green sub-pixel of the first pixel unit P1 on the substrate; and the area of the normal projection of the anode AN-B of the blue sub-pixel of the second pixel unit P2 on the substrate is greater than the area of the normal projection of the anode AN-B of the blue sub-pixel of the first pixel unit P1 on the substrate.

[0082] The embodiment of the present application provides a display substrate, by setting the area of the light-emitting area F of the second pixel unit P2 in the edge area AA-B to be larger than the area of the light-emitting area of the first pixel unit P1 in the middle area AA-M, and by setting the area of the normal projection of the anode AN of the sub-pixel in the edge area AA-B on the substrate to be larger than the area of the normal projection of the anode AN of the sub-pixel in the middle area AA-M on the substrate, when the display panel formed by the display substrate is controlled to display, the brightness of all the pixel units can be set to be the same (for example, the voltage of the anode of all the pixel units is consistent), and because the area of the light-emitting area F of the second pixel unit P2 in the edge area AA-B is larger than the area of the light-emitting area F of the first pixel unit P1 in the middle area AA-M, the total intensity of the light of the second pixel unit P2 is larger than the total intensity of the light of the first pixel unit P1, so that when the spliced display device is formed, after the brightness of the second pixel unit P2 in the edge area AA-B at the splicing seam position is compensated, the brightness of the second pixel unit P2 at the self position can be maintained, the problem of the fragmentation of the picture at the splicing seam position is improved, the service life of the spliced display device is prolonged, and the product quality is improved.

[0083] In some embodiments, the display substrate is in the shape of a quadrilateral, for example, a square or a rectangle, and the display substrate comprises a first side edge, a second side edge, a third side edge and a fourth side edge which are sequentially connected, wherein at least one row of second pixel units P2 is arranged along at least one of the first side edge, the second side edge, the third side edge and the fourth side edge.

[0084] The at least one row of second pixel units P2 arranged along at least one of the first side edge, the second side edge, the third side edge and the fourth side edge includes but is not limited to the following cases:

[0085] Figures 13-17 Five splicing modes are shown, and taking the left side edge of a display substrate in the figure as the first side edge, the upper side edge as the second side edge, the right side edge as the third side edge and the lower side edge as the fourth side edge as an example.

[0086] First, as shown in Figure 13 , for the left display substrate 1, at least one row of second pixel units P2 is arranged on the third side edge thereof; for the right display substrate 2, at least one row of second pixel units P2 is arranged on the first side edge thereof;

[0087] Second, as shown in Figure 14As shown, for the display substrate 1 on the left, at least one row of second pixel units P2 is arranged on the third side edge thereof; for the display substrate 2 in the middle, at least one row of second pixel units P2 is arranged on the first side edge thereof and at least one row of second pixel units P2 is arranged on the third side edge thereof; for the display substrate 3 on the right, at least one row of second pixel units P2 is arranged on the first side edge thereof.

[0088] Third, as shown in FIG. 3, for the display substrate 1 on the upper left, at least one row of second pixel units P2 is arranged on the third side edge thereof and at least one row of second pixel units P2 is arranged on the fourth side edge thereof; for the display substrate 2 on the upper right, at least one row of second pixel units P2 is arranged on the first side edge thereof and at least one row of second pixel units P2 is arranged on the fourth side edge thereof; for the display substrate 3 on the lower left, at least one row of second pixel units P2 is arranged on the second side edge thereof and at least one row of second pixel units P2 is arranged on the third side edge thereof; for the display substrate 4 on the lower right, at least one row of second pixel units P2 is arranged on the first side edge thereof and at least one row of second pixel units P2 is arranged on the fourth side edge thereof. Figure 15 Fourth, as shown in FIG. 4, for the display substrate 2 on the upper middle, at least one row of second pixel units P2 is arranged on the first side edge thereof, at least one row of second pixel units P2 is arranged on the third side edge thereof, and at least one row of second pixel units P2 is arranged on the fourth side edge thereof; for the display substrate 5 on the lower middle, at least one row of second pixel units P2 is arranged on the first side edge thereof, at least one row of second pixel units P2 is arranged on the second side edge thereof, and at least one row of second pixel units P2 is arranged on the third side edge thereof.

[0089] Figure 16 Fifth, as shown in FIG. 5, for the display substrate 5 in the middle, at least one row of second pixel units P2 is arranged on each of the first side edge, the second side edge, the third side edge, and the fourth side edge thereof.

[0090] In some embodiments, as shown in the display substrate 5 in the middle of FIG. 6, the side edges of the display substrate are provided with a ring of second pixel units P2. It can be understood that the first side edge of the display substrate 5 is provided with a row of second pixel units P2, the second side edge of the display substrate 5 is provided with a row of second pixel units P2, the third side edge of the display substrate 5 is provided with a row of second pixel units P2, and the fourth side edge of the display substrate 5 is provided with a row of second pixel units P2. The four rows of second pixel units P2 arranged on the four side edges form a ring of second pixel units P2. Figure 17 For example, as shown in FIG. 7, two rings of second pixel units P2 are arranged along the side edges of the display substrate.

[0091] In some embodiments, as shown in the display substrate 5 in the middle of FIG. 8, the side edges of the display substrate are provided with a ring of second pixel units P2. It can be understood that the first side edge of the display substrate 5 is provided with a row of second pixel units P2, the second side edge of the display substrate 5 is provided with a row of second pixel units P2, the third side edge of the display substrate 5 is provided with a row of second pixel units P2, and the fourth side edge of the display substrate 5 is provided with a row of second pixel units P2. The four rows of second pixel units P2 arranged on the four side edges form a ring of second pixel units P2. Figure 17 Figure 4 For example, as shown in FIG. 9, two rings of second pixel units P2 are arranged along the side edges of the display substrate. ​​

[0092] The display substrate provided by the embodiments of the present application is provided with at least one row of second pixel units P2 along at least one of the first side edge, the second side edge, the third side edge and the fourth side edge. The area of the light-emitting region F of the second pixel unit P2 in the edge area AA-B is greater than the area of the light-emitting region of the first pixel unit P1 in the middle area AA-M. Since the area of the light-emitting region F of the second pixel unit P2 in the edge area AA-B is greater than the area of the light-emitting region F of the first pixel unit P1 in the middle area AA-M, the total light intensity of the second pixel unit P2 is greater than the total light intensity of the first pixel unit P1. Therefore, when the display device is formed by splicing, the second pixel unit P2 in the edge area AA-B can maintain the brightness at its own position after compensating the brightness at the splicing position, thereby improving the sense of fragmentation of the picture at the splicing position, ensuring the uniformity of the brightness of the display device, prolonging the service life of the display device and improving the product quality.

[0093] In the display substrate provided by the embodiments of the present application, the display substrate further comprises a pixel definition layer PDL, the pixel definition layer PDL comprises a plurality of first openings K1 and a plurality of second openings K2, the first openings K1 are located in the middle area, and the second openings K2 are located in the edge area. Figure 8 Figure 10 As shown in the display substrate provided by the embodiments of the present application, the display substrate further comprises a pixel definition layer PDL, the pixel definition layer PDL comprises a plurality of first openings K1 and a plurality of second openings K2, the first openings K1 are located in the middle area, and the second openings K2 are located in the edge area.

[0094] As shown in the display substrate provided by the embodiments of the present application, the display substrate further comprises a pixel definition layer PDL, the pixel definition layer PDL comprises a plurality of first openings K1 and a plurality of second openings K2, the first openings K1 are located in the middle area, and the second openings K2 are located in the edge area. Figure 8 The outer contour of the first opening K1 in the display substrate provided by the embodiments of the present application is projected on the substrate to define an area, and the area overlaps the normal projection of the anode AN of the sub-pixel located in the middle area AA-M on the substrate. The outer contour of the second opening K2 in the display substrate provided by the embodiments of the present application is projected on the substrate to define an area, and the area overlaps the normal projection of the anode AN of the sub-pixel located in the edge area AA-B on the substrate. For sub-pixels of the same color, the area of the normal projection pattern of the outer contour of the first opening K1 on the substrate is smaller than the area of the normal projection pattern of the outer contour of the second opening K2 on the substrate.

[0095] For example, the area defined by the normal projection of the outer contour of the first opening K1 on the substrate overlaps the normal projection of the anode AN of the sub-pixel located in the middle area AA-M on the substrate, which includes the following cases:

[0096] 1. The area defined by the normal projection of the outer contour of the first opening K1-R on the substrate overlaps the normal projection of the anode AN-R of the sub-pixel R located in the middle area AA-M on the substrate.

[0097] 2. The area defined by the normal projection of the outer contour of the first opening K1-G on the substrate overlaps the normal projection of the anode AN-G of the sub-pixel G located in the middle area AA-M on the substrate.

[0098] ​3. The area circumscribed by the orthogonal projection of the outer contour of the first opening K1-B on the substrate overlaps with the orthogonal projection of the anode AN-B of the sub-pixel B in the middle area AA-M.

[0099] For the sub-pixels of the same color, the area of the orthogonal projection pattern of the outer contour of the first opening K1 on the substrate is smaller than the area of the orthogonal projection pattern of the outer contour of the second opening K2 on the substrate, including the following cases:

[0100] 1. For the red sub-pixel R, the area of the orthogonal projection pattern of the outer contour of the first opening K1-R on the substrate is smaller than the area of the orthogonal projection pattern of the outer contour of the second opening K2-R on the substrate;

[0101] 2. For the green sub-pixel G, the area of the orthogonal projection pattern of the outer contour of the first opening K1-G on the substrate is smaller than the area of the orthogonal projection pattern of the outer contour of the second opening K2-G on the substrate;

[0102] 3. For the blue sub-pixel B, the area of the orthogonal projection pattern of the outer contour of the first opening K1-B on the substrate is smaller than the area of the orthogonal projection pattern of the outer contour of the second opening K2-B on the substrate.

[0103] In the embodiments of the present application, the size of the first opening K1 or the second opening K2 determines the effective contact area of the light-emitting functional layer with the anode AN, thereby determining the area of the light-emitting region F. For the sub-pixels of the same color, by setting the area of the orthogonal projection pattern of the outer contour of the first opening K1 on the substrate to be smaller than the area of the orthogonal projection pattern of the outer contour of the second opening K2 on the substrate, the effective contact area of the light-emitting functional layer with the anode AN of the second pixel unit P2 located in the edge area AA-B can be made larger than the effective contact area of the light-emitting functional layer with the anode AN of the first pixel unit P1 located in the middle area AA-M, thereby ensuring that the area of the light-emitting region F of the second pixel unit P2 located in the edge area AA-B is larger than the area of the light-emitting region F of the first pixel unit P1 located in the middle area AA-M.

[0104] In the display substrate provided in the embodiments of the present application, in combination with Figure 8 and Figure 9 as shown, the first conductive layer ANL further includes a plurality of connection electrodes LJ, the orthogonal projection of the connection electrode LJ on the substrate does not overlap with the orthogonal projection of the pixel unit on the substrate, and the connection electrode LJ is electrically connected with the anode AN;

[0105] In combination with Figure 8 and Figure 10As shown, the pixel definition layer PDL includes a plurality of third openings K3, and a region circumscribed by a normal projection of an outer contour of the third openings K3 on the substrate overlaps with a normal projection of the connection electrode LJ on the substrate; the number of the third openings K3 is the same as the number of the connection electrode LJ.

[0106] The connection electrode LJ is at least located in the middle region AA-M.

[0107] In the embodiments of the present application, by arranging the connection electrode LJ in the display region, the connection electrode LJ is used to connect the cathode and the anode, thereby forming a closed loop of the pixel driving circuit. Compared with the related art in which the connection electrode LJ is arranged in the peripheral region (for example, a ring-shaped connection electrode, also referred to as a cathode ring), the bezel size can be significantly reduced, thereby further reducing the actual size of the joint seam and improving the display effect.

[0108] The connection electrode LJ being at least located in the middle region AA-M includes but is not limited to the following cases:

[0109] 1. The connection electrode LJ is only located in the middle region AA-M.

[0110] 2. The connection electrode LJ is not only located in the middle region AA-M, but also extends to the edge region AA-B outside the middle region AA-M.

[0111] In the display substrate provided by the embodiments of the present application, as shown in Figure 4 some of the connection electrodes LJ are located in the middle region AA-M, and some of the connection electrodes LJ are located in the edge region AA-B; and the distribution density of the connection electrodes LJ located in the middle region AA-M is greater than the distribution density of the connection electrodes LJ located in the edge region AA-B.

[0112] In the display substrate provided by the embodiments of the present application, as shown in Figure 4 some of the connection electrodes LJ are located in the middle region AA-M, and some of the connection electrodes LJ are located in the edge region AA-B; and the number of the connection electrodes LJ located in the middle region AA-M is greater than the number of the connection electrodes LJ located in the edge region AA-B.

[0113] In the embodiments of the present application, by arranging the distribution density of the connection electrodes LJ located in the middle region AA-M to be greater than the distribution density of the connection electrodes LJ located in the edge region AA-B, or by arranging the number of the connection electrodes LJ located in the middle region AA-M to be greater than the number of the connection electrodes LJ located in the edge region AA-B, a larger design space can be provided in the edge region AA-B, so as to further increase the area of the light-emitting region of the second sub-pixel P2 in the edge region AA-B, reduce the actual size of the joint seam, improve the display effect, and prolong the service life of the product.

[0114] In the display substrate provided by the embodiment of the present application, each sub-pixel comprises a light-emitting functional layer EL, and the light-emitting functional layer EL is located on the side of the anode AN away from the substrate.

[0115] For sub-pixels of the same color, the area of the orthographic projection of the light-emitting functional layer EL in the edge area AA-B on the substrate is greater than the area of the orthographic projection of the light-emitting functional layer EL in the middle area AA-M on the substrate.

[0116] For example, for a red sub-pixel R, the area of the orthographic projection of the light-emitting functional layer EL-R in the edge area AA-B on the substrate is greater than the area of the orthographic projection of the light-emitting functional layer EL-R in the middle area AA-M on the substrate; for a green sub-pixel G, the area of the orthographic projection of the light-emitting functional layer EL-G in the edge area AA-B on the substrate is greater than the area of the orthographic projection of the light-emitting functional layer EL-G in the middle area AA-M on the substrate; and for a blue sub-pixel B, the area of the orthographic projection of the light-emitting functional layer EL-B in the edge area AA-B on the substrate is greater than the area of the orthographic projection of the light-emitting functional layer EL-B in the middle area AA-M on the substrate.

[0117] In the embodiment of the present application, for sub-pixels of the same color, the area of the orthographic projection of the light-emitting functional layer EL in the edge area AA-B on the substrate is greater than the area of the orthographic projection of the light-emitting functional layer EL in the middle area AA-M on the substrate. In this way, the area of the light-emitting region F of the second pixel unit P2 located in the edge area AA-B can be ensured to be greater than the area of the light-emitting region F of the first pixel unit P1 located in the middle area AA-M, so as to reduce the actual size of the joint, improve the display effect, and prolong the service life of the product.

[0118] In the display substrate provided by the embodiment of the present application, the light-emitting functional layer EL comprises a light-emitting sub-layer EML and a functional sub-layer CL.

[0119] The functional sub-layer CL can comprise at least one of a hole injection sub-layer, a hole transport sub-layer, an electron injection sub-layer, an electron transport sub-layer, and a charge transport sub-layer.

[0120] For example, the light-emitting functional layer EL can comprise a hole injection sub-layer (HIL), a hole transport layer (HTL), an organic transition buffer layer (Prime), a light-emitting sub-layer (such as a blue EML, a red EML, and a green EML), a hole blocking layer (HBL), and an electron injection layer (EIL) which are sequentially stacked.

[0121] For example, the light-emitting functional layer EL can include a first light-emitting sub-layer, a second light-emitting sub-layer, and a charge transport sub-layer (CGL) between the first light-emitting sub-layer (EML1) and the second light-emitting sub-layer (EML2), and can also include a hole injection sub-layer (HIL), a hole transport sub-layer (HTL), an electron injection sub-layer (EIL), and an electron transport sub-layer (ETL), so that the display substrate can implement a double-layer light-emitting (Tandem EL) design.

[0122] It should be noted that, in the embodiments of the present application, in order to facilitate the description of the light-emitting sub-layer EML and the functional sub-layer CL, the functional sub-layer CL is drawn on the side of the light-emitting sub-layer (for example, R-EML, G-EML, B-EML) away from the substrate in the drawings of the present application. In actual application, part of the functional sub-layer CL is located between the light-emitting sub-layer and the substrate, and part of the functional sub-layer CL is located on the side of the light-emitting sub-layer away from the substrate. For details, please refer to the description in the related art. Figure 8

[0123] In combination with FIGS. 1-3, for the same color of sub-pixel, the area of the orthographic projection pattern of the light-emitting sub-layer (for example, R-EML, G-EML, B-EML) of the edge area AA-B (the second pixel unit P2) on the substrate is equal to the area of the orthographic projection pattern of the light-emitting sub-layer (for example, R-EML, G-EML, B-EML) of the middle area AA-M (the first pixel unit P1) on the substrate. Figure 5 Figure 6 For example, the area of the orthographic projection pattern of the red light-emitting sub-layer R-EM of the edge area AA-B (the second pixel unit P2) on the substrate is equal to the area of the orthographic projection pattern of the red light-emitting sub-layer R-EML of the middle area AA-M (the first pixel unit P1) on the substrate; the area of the orthographic projection pattern of the green light-emitting sub-layer G-EM of the edge area AA-B (the second pixel unit P2) on the substrate is equal to the area of the orthographic projection pattern of the green light-emitting sub-layer G-EML of the middle area AA-M (the first pixel unit P1) on the substrate; and the area of the orthographic projection pattern of the blue light-emitting sub-layer B-EM of the edge area AA-B (the second pixel unit P2) on the substrate is equal to the area of the orthographic projection pattern of the blue light-emitting sub-layer B-EML of the middle area AA-M (the first pixel unit P1) on the substrate. Figure 7

[0124]

[0125] ​​​​In the embodiments of the present application, for the same color sub-pixel, by setting the area of the normal projection pattern of the light-emitting sub-layer (for example, R-EML, G-EML, B-EML) of the edge area AA-B (second pixel unit P2) on the substrate to be equal to the area of the normal projection pattern of the light-emitting sub-layer (for example, R-EML, G-EML, B-EML) of the middle area AA-M (first pixel unit P1) on the substrate, the preparation process difficulty of the mask (FMM Mask) of the light-emitting sub-layer can be significantly reduced, and the cost is reduced.

[0126] The area of the normal projection pattern of the functional sub-layer CL-P2 of the edge area AA-B (second pixel unit P2) on the substrate is greater than the area of the normal projection pattern of the functional sub-layer CL-P1 of the middle area AA-M (first pixel unit P1) on the substrate. The functional sub-layer CL can include at least one of a hole injection sub-layer, a hole transport sub-layer, an electron injection sub-layer, an electron transport sub-layer, and a charge transport sub-layer.

[0127] For example, the area of the normal projection pattern of the hole transport sub-layer (HTL) of the edge area AA-B (second pixel unit P2) on the substrate is greater than the area of the normal projection pattern of the hole transport sub-layer of the middle area AA-M (first pixel unit P1) on the substrate.

[0128] For example, the area of the normal projection pattern of the electron transport sub-layer (ETL) of the edge area AA-B (second pixel unit P2) on the substrate is greater than the area of the normal projection pattern of the hole transport sub-layer of the middle area AA-M (first pixel unit P1) on the substrate.

[0129] In the display substrate provided in the embodiments of the present application, by setting the area of the normal projection pattern of the functional sub-layer CL-P2 of the edge area AA-B (second pixel unit P2) on the substrate to be greater than the area of the normal projection pattern of the functional sub-layer CL-P1 of the middle area AA-M (first pixel unit P1) on the substrate, the aperture ratio of the second pixel unit P2 in the edge area AA-B can be significantly increased, thereby increasing the compensation effect of each second pixel unit P2 in the edge area on the light at the joint position, improving the display effect of the spliced display device, prolonging the service life of the second pixel unit P2 in the edge area AA-B, and thus improving the quality of the product.

[0130] In the display substrate provided in the embodiments of the present application, in the middle area AA-M, for the same sub-pixel, as shown in Figure 5 For example, in the sub-pixel of the first pixel unit P1, the normal projection of the light-emitting sub-layer (E-EML, G-EML, or B-EML) on the substrate partially overlaps with the normal projection of the functional sub-layer CL on the substrate.

[0131] In the edge area, for the same sub-pixel, as shown in Figure 6 for example, in the sub-pixel of the second pixel unit P2, the orthographic projection of the light-emitting sub-layer (E-EML, G-EML or B-EML) on the substrate is within the orthographic projection of the functional sub-layer CL on the substrate.

[0132] For example, as shown in Figure 6 in the sub-pixel of the second pixel unit P2, the outer contour of the orthographic projection of the light-emitting sub-layer (E-EML, G-EML or B-EML) on the substrate is within the outer contour of the orthographic projection of the functional sub-layer CL on the substrate.

[0133] In the embodiments of the present application, by setting the size and shape of the light-emitting sub-layer of the same color sub-pixel in the middle area AA-M and the edge area AA-B to be the same, setting the size of the functional sub-layer CL in the edge area AA-B to be increased, and setting the size of the second opening K2 in the edge area AA-B to be larger, the aperture ratio of the pixel unit in the edge area AA-B can be significantly improved. The higher the aperture ratio is, the larger the area of the light-emitting region is, thereby improving the total brightness of the light emitted by the second pixel unit P2 in the edge area AA-B, thereby increasing the compensation effect of the light at the joint position by each second pixel unit P2 in the edge area AA-B. While improving the display effect of the spliced display device, the life of the second pixel unit P2 in the edge area AA-B is prolonged, and the quality of the product is improved.

[0134] In the display substrate provided in the embodiments of the present application, as shown in Figure 4 in the middle area AA-M, the functional sub-layers CL of each sub-pixel in the same first pixel unit P1 are integrally arranged, and the functional sub-layers CL in adjacent two first pixel units P1 are arranged to be disconnected; in the edge area AA-B, the functional sub-layers CL of each sub-pixel in the same second pixel unit P2 are integrally arranged, and the functional sub-layers CL in at least two second pixel units P2 are integrally arranged.

[0135] In the embodiments of the present application, since the size of the opening (the second opening K2) of the pixel definition layer of the second pixel unit P2 in the edge area AA-B is larger than the size of the opening (the first opening K1) of the pixel definition layer of the first pixel unit P1 in the middle area, by integrally arranging the functional sub-layers CL in at least two second pixel units P2, the aperture ratio of the second pixel unit P2 in the edge area can be improved while greatly reducing the difficulty and risk of the preparation process of the second pixel unit P2 in the edge area, improving the preparation yield of the display substrate, and improving the product quality.

[0136] In the display substrate provided in the embodiments of the present application, as shown in Figure 4As shown, in the case that the functional sub-layers CL in the at least two second pixel units P are integrally arranged, the orthographic projection of the integrally arranged functional sub-layers CL on the substrate covers the region between the two adjacent second pixel units P2; and the orthographic projection of the connection electrode LJ on the substrate does not overlap with the orthographic projection of the integrally arranged functional sub-layers CL on the substrate.

[0137] In the display substrate provided by the embodiment of the present application, as shown in Figure 8 As shown, the display substrate further comprises a cathode layer CA, the cathode layer CA comprises a plurality of cathodes, the plurality of cathodes are in an integrated structure, the cathode layer CA covers the pixel definition layer PDL, and the cathode layer CA is in contact with each connection electrode LJ.

[0138] In the embodiment of the present application, by arranging the orthographic projection of the connection electrode LJ on the substrate and the orthographic projection of the integrally arranged functional sub-layers CL on the substrate to not overlap with each other, in combination with Figure 8 As shown, in the case that the connection electrode LJ is in contact with the cathode layer CA, the functional sub-layers CL of each sub-pixel are not interfered, thereby ensuring normal light emission of each sub-pixel.

[0139] In the embodiment of the present application, by arranging the connection electrode LJ in the display area, the connection electrode LJ is in contact with the cathode and the anode, thereby forming a closed loop of the pixel driving circuit. Compared with the related art in which the connection electrode LJ is arranged in the peripheral area (for example, a ring-shaped connection electrode, also referred to as a cathode ring), the frame size can be significantly reduced, thereby further reducing the actual size of the splicing seam and improving the display effect.

[0140] In the display substrate provided by the embodiment of the present application, the spacing between the light emitting areas F of the two adjacent first pixel units P1 is equal, and the spacing between the light emitting areas F of the two adjacent second pixel units P2 is equal.

[0141] In the display substrate provided by the embodiment of the present application, the spacing between the light emitting areas F of any two adjacent pixel units (including the first pixel unit P1 and the second pixel unit P2) is equal.

[0142] In the embodiment of the present application, by arranging the spacing between the light emitting areas F of any two adjacent pixel units (including the first pixel unit P1 and the second pixel unit P2) to be equal, the light emitting areas F of each pixel unit are uniformly distributed, thereby improving the brightness uniformity of the display substrate.

[0143] In the display substrate provided by the embodiments of the present application, N circles of second pixel units P2 are arranged along the side of the display substrate; the orthographic projection of the display area on the substrate includes a first top corner, a second top corner, a third top corner and a fourth top corner, the functional sub-layers CL of the N*N second pixel units P2 located at the first top corner are integrally arranged, the functional sub-layers CL of the N*N second pixel units P2 located at the second top corner are integrally arranged, the functional sub-layers CL of the N*N second pixel units P2 located at the third top corner are integrally arranged, and the functional sub-layers CL of the N*N second pixel units P2 located at the fourth top corner are integrally arranged; wherein N is greater than or equal to 2.

[0144] As shown in FIG. 1, two circles of second pixel units P2 are arranged along the side of the display substrate; the orthographic projection of the display area on the substrate includes a first top corner, a second top corner, a third top corner and a fourth top corner, the functional sub-layers CL of the 2*2 second pixel units P2 located at the first top corner are integrally arranged, the functional sub-layers CL of the 2*2 second pixel units P2 located at the second top corner are integrally arranged, the functional sub-layers CL of the 2*2 second pixel units P2 located at the third top corner are integrally arranged, and the functional sub-layers CL of the 2*2 second pixel units P2 located at the fourth top corner are integrally arranged. Figure 4 In the embodiments of the present application, since the size of the opening (second opening K2) of the pixel definition layer of the second pixel unit P2 in the edge area AA-B is greater than the size of the opening (first opening K1) of the pixel definition layer of the first pixel unit P1 in the middle area, by integrally arranging the functional sub-layers CL in the plurality of second pixel units P2 at the top corners, the aperture ratio of the second pixel unit P2 in the edge area can be ensured to be improved, while greatly reducing the difficulty and risk of the preparation process of the second pixel unit P2 in the edge area, improving the preparation yield of the display substrate, and improving the product quality.

[0145] It should be noted that in addition to the structures described above, the display substrate can also include other structures and components, such as a planarization layer PLN, a driving circuit, and a peripheral area surrounding the display area AA, wherein the peripheral area includes a binding sub-area BD, and the binding sub-area BD includes a binding terminal. This specification only introduces structures related to the invention points, and other structures and components included in the display substrate can be referred to the introduction in the related art.

[0146] The embodiments of the present application provide a display panel, which includes the display substrate as described above.

[0147]

[0148] ​The display panel provided by the embodiment of the present application has the area of the light emitting area F of the second pixel unit P2 in the edge area AA-B greater than the area of the light emitting area of the first pixel unit P1 in the middle area AA-M, so that when the display panel formed by the display substrate is controlled to display, the brightness of all the pixel units can be set to be the same (for example, the voltage of the anode of all the pixel units is set to be the same), and the total light intensity of the second pixel unit P2 is greater than the total light intensity of the first pixel unit P1, so that when the spliced display device is formed, the second pixel unit P2 in the edge area AA-B can maintain the brightness at its own position after compensating the brightness at the splicing seam position, the problem of the split feeling of the picture at the splicing seam position is improved, the service life of the spliced display device is prolonged, and the product quality is improved.

[0149] The embodiment of the present application provides a spliced display device, which comprises at least two display panels as described above.

[0150] The display panel provided by the embodiment of the present application has the area of the light emitting area F of the second pixel unit P2 in the edge area AA-B greater than the area of the light emitting area of the first pixel unit P1 in the middle area AA-M, so that when the display panel formed by the display substrate is controlled to display, the brightness of all the pixel units can be set to be the same (for example, the voltage of the anode of all the pixel units is set to be the same), and the total light intensity of the second pixel unit P2 is greater than the total light intensity of the first pixel unit P1, so that when the spliced display device is formed, the second pixel unit P2 in the edge area AA-B can maintain the brightness at its own position after compensating the brightness at the splicing seam position, the problem of the split feeling of the picture at the splicing seam position is improved, the service life of the spliced display device is prolonged, and the product quality is improved.

[0151] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A display substrate, wherein: include: A display area, a substrate, and a first conductive layer located on the substrate; The display area includes a middle area and an edge area surrounding the middle area, the middle area includes a plurality of first pixel units arranged in an array, the edge area includes a plurality of second pixel units, and at least one row of the second pixel units is arranged along a side of the display substrate; The light emitting area of ​​the second pixel unit is larger than the light emitting area of ​​the first pixel unit; The first conductive layer includes a plurality of anodes; each pixel unit includes a plurality of sub-pixels; for the sub-pixels of the same color, the area of ​​the orthographic projection of the anode of the sub-pixel located in the edge region on the substrate is larger than the area of ​​the orthographic projection of the anode of the sub-pixel located in the middle region on the substrate; The first conductive layer further includes a plurality of connecting electrodes, wherein the orthographic projections of the connecting electrodes on the substrate do not overlap with the orthographic projections of the pixel units on the substrate, and the connecting electrodes are electrically connected to the anodes; the connecting electrodes are at least located in the middle region; Some of the connecting electrodes are located in the middle area, and some of the connecting electrodes are located in the edge area; wherein the distribution density of the connecting electrodes located in the middle area is greater than the distribution density of the connecting electrodes located in the edge area.

2. The display substrate according to claim 1, wherein The display substrate includes a first side, a second side, a third side, and a fourth side connected in sequence, wherein at least one row of the second pixel units is arranged along at least one of the first side, the second side, the third side, and the fourth side.

3. The display substrate according to claim 1, wherein The display substrate further includes: a pixel definition layer, the pixel definition layer including a plurality of first openings and a plurality of second openings, the first openings being located in the middle region, and the second openings being located in the edge region; An area defined by an orthographic projection of the outer contour of the first opening on the substrate overlaps with an orthographic projection of the anode of the sub-pixel located in the middle area on the substrate, and an area defined by an orthographic projection of the outer contour of the second opening on the substrate overlaps with an orthographic projection of the anode of the sub-pixel located in the edge area on the substrate; For the sub-pixels of the same color, the area of ​​the orthographic projection of the outer contour of the first opening on the substrate is smaller than the area of ​​the orthographic projection of the outer contour of the second opening on the substrate.

4. The display substrate according to claim 3, wherein: The pixel definition layer includes a plurality of third openings, and an area defined by an orthographic projection of an outer contour of the third opening on the substrate overlaps with an orthographic projection of the connection electrode on the substrate; The number of the third openings is the same as the number of the connecting electrodes.

5. The display substrate according to claim 1, wherein Some of the connecting electrodes are located in the middle area, and some of the connecting electrodes are located in the edge area; wherein the number of the connecting electrodes located in the middle area is greater than the number of the connecting electrodes located in the edge area. The display substrate according to claim 5 , wherein: Each of the sub-pixels includes a light-emitting functional layer, and the light-emitting functional layer is located on a side of the anode away from the substrate; For the sub-pixels of the same color, the area of ​​the orthographic projection of the light-emitting functional layer in the edge region on the substrate is larger than the area of ​​the orthographic projection of the light-emitting functional layer in the middle region on the substrate.

7. The display substrate according to claim 6, wherein: The light-emitting functional layer includes a light-emitting sublayer and a functional sublayer; For the sub-pixels of the same color, the area of ​​the orthographic projection of the light-emitting sublayer in the edge region on the substrate is equal to the area of ​​the orthographic projection of the light-emitting sublayer in the middle region on the substrate, and the area of ​​the orthographic projection of the functional sublayer in the edge region on the substrate is larger than the area of ​​the orthographic projection of the functional sublayer in the middle region on the substrate.

8. The display substrate according to claim 7, wherein: In the middle region, for the same sub-pixel, the orthographic projection of the light-emitting sublayer on the substrate partially overlaps with the orthographic projection of the functional sublayer on the substrate; In the edge region, for the same sub-pixel, the orthographic projection of the light-emitting sub-layer on the substrate is located within the orthographic projection of the functional sub-layer on the substrate.

9. The display substrate according to claim 7, wherein: In the middle area, the functional sublayers of the sub-pixels in the same first pixel unit are integrated, and the functional sublayers in two adjacent first pixel units are disconnected; In the edge region, the functional sublayers of the sub-pixels in the same second pixel unit are integrated, and the functional sublayers in at least two second pixel units are integrated.

10. The display substrate according to claim 9, wherein: When the functional sublayers in at least two of the second pixel units are integrated, the orthographic projection of the integrated functional sublayer on the substrate covers the area between two adjacent second pixel units; The orthographic projection of the connecting electrode on the substrate and the orthographic projection of the integrally arranged functional sublayer on the substrate do not overlap with each other.

11. The display substrate according to any one of claims 4 to 5 and 7 to 10, wherein: It also includes a cathode layer, which includes a plurality of cathodes. The plurality of cathodes are an integrated structure. The cathode layer covers the pixel definition layer, and the cathode layer is in contact with and conductive with each of the connection electrodes.

12. The display substrate according to claim 1, wherein The distance between the light-emitting areas of two adjacent first pixel units is equal, and the distance between the light-emitting areas of two adjacent second pixel units is equal.

13. The display substrate according to claim 1, wherein The distances between the light emitting areas of any two adjacent pixel units are equal.

14. The display substrate according to claim 9, wherein: N circles of second pixel units are arranged along the side of the display substrate; the orthographic projection pattern of the display area on the substrate includes a first vertex corner, a second vertex corner, a third vertex corner and a fourth vertex corner, the functional sublayers of the N*N second pixel units located at the first vertex corner are integrated, the functional sublayers of the N*N second pixel units located at the second vertex corner are integrated, the functional sublayers of the N*N second pixel units located at the third vertex corner are integrated, and the functional sublayers of the N*N second pixel units located at the fourth vertex corner are integrated; wherein, N is greater than or equal to 2.

15. The display substrate according to claim 7, wherein: The functional sublayer includes at least one of a hole injection sublayer, a hole transport sublayer, an electron injection sublayer, an electron transport sublayer, and a charge transport sublayer.

16. A display panel, wherein: The display substrate comprises the display substrate according to any one of claims 1 to 15.

17. A spliced ​​display device, wherein: Comprising at least two display panels as claimed in claim 16.

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