Display panel and display device

Abstract

The application provides a display panel and a display device. The display panel comprises a display area and a non-display area located on at least one side of the display area. The display area is provided with a plurality of light-emitting pixel units. The non-display area is provided with at least one virtual pixel unit. The area of the virtual pixel unit is greater than the area of the light-emitting pixel unit of the display area. The maximum film-forming height difference of the virtual pixel unit is less than the maximum film-forming height difference of the light-emitting pixel unit. Thus, when an inkjet printing film-forming light-emitting material layer is used, the area of the large-area virtual pixel unit can accommodate more printing ink, so as to create a large amount of solvent atmosphere in the area to eliminate the influence of uneven vacuum drying, thereby improving the uniformity of film formation of the light-emitting pixel unit in the display area.

Description

TECHNICAL FIELD

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

[0002] Organic Light Emitting Diode (OLED) display has become a research hotspot in the field of photoelectric display technology due to its self-luminous, wide viewing angle, high contrast, low power consumption, extremely high response speed, ultra-light weight, flexible display, screen curling, strong temperature adaptability, simple manufacturing process and other advantages. The film forming methods of light emitting pixels in OLED display mainly include evaporation process and solution process. The evaporation process has been applied to mass production, but due to the high material cost and low material utilization rate of the evaporation process, the production cost of OLED display is high. Solution process includes spin coating, inkjet printing, nozzle coating method, etc., which is suitable for polymer materials and soluble small molecule materials, and the equipment cost of solution process is low, which can reduce the production cost of OLED display.

[0003] However, when using inkjet printing process to form light emitting pixels, due to the influence of printing ink characteristics and drying uniformity of vacuum drying equipment, the film forming uniformity is poor, which affects the service life and light emitting quality of light emitting pixels. SUMMARY

[0004] The present application provides a display panel and a display device to alleviate the technical problem of poor film forming uniformity when using inkjet printing process to form light emitting pixels.

[0005] To solve the above problems, the technical solutions provided by the present application are as follows:

[0006] The display panel provided by the embodiment of the present application comprises a display area and a non-display area located at least one side of the display area, and further comprises:

[0007] a substrate;

[0008] a light emitting material layer disposed on the substrate, the light emitting material layer comprising a plurality of light emitting pixel units formed in the display area and at least one virtual pixel unit formed in the non-display area;

[0009] wherein the area of the virtual pixel unit is greater than the area of the light emitting pixel unit, and the maximum film forming height difference of the virtual pixel unit is less than the maximum film forming height difference of the light emitting pixel unit.

[0010] In the display panel provided by the embodiment of the present application, the maximum film forming height difference of the virtual pixel unit is 0.5 times or less of the maximum film forming height difference of the light emitting pixel unit.

[0011] In the display panel provided by the embodiment of the present application, the area of a single virtual pixel unit is 3 times or more of the area of a single light-emitting pixel unit.

[0012] In the display panel provided by the embodiment of the present application, the maximum film-forming height difference of the virtual pixel unit is less than 50 nanometers.

[0013] In the display panel provided by the embodiment of the present application, the plurality of light-emitting pixel units include first color light-emitting pixel units, second color light-emitting pixel units, and third color light-emitting pixel units, the first color light-emitting pixel units are red light-emitting pixel units, the second color light-emitting pixel units are green light-emitting pixel units, and the third color light-emitting pixel units are blue light-emitting pixel units.

[0014] The maximum film-forming height difference of the second color light-emitting pixel unit is less than the maximum film-forming height difference of the first color light-emitting pixel unit, and the maximum film-forming height difference of the second color light-emitting pixel unit is less than the maximum film-forming height difference of the third color light-emitting pixel unit.

[0015] The difference between the maximum film-forming height differences of any two of the first color light-emitting pixel units, the second color light-emitting pixel units, and the third color light-emitting pixel units is less than 30 nanometers.

[0016] In the display panel provided by the embodiment of the present application, the non-display area includes oppositely arranged first and second sub-areas, the display area is adjacent to the first and second sub-areas, the virtual pixel units are arranged in the first and second sub-areas, the virtual pixel units in the first sub-area are centrally symmetric to the virtual pixel units in the second sub-area, the plurality of light-emitting pixel units are arranged in a light-emitting pixel row in a first direction, the plurality of light-emitting pixel units are arranged in a light-emitting pixel column in a second direction, the first direction and the second direction are arranged to intersect, the length of the light-emitting pixel unit in the first direction is greater than the length of the light-emitting pixel unit in the second direction, and in the second direction, the light-emitting pixel row is located between the first and second sub-areas.

[0017] In the display panel provided by the embodiment of the present application, the non-display area further includes oppositely arranged third and fourth sub-areas, the third and fourth sub-areas are located between the first and second sub-areas, the virtual pixel units are arranged in the third and fourth sub-areas, the virtual pixel units in the third sub-area are centrally symmetric to the virtual pixel units in the fourth sub-area, and the virtual pixel units in the first, third, second, and fourth sub-areas surround the display area.

[0018] In the display panel provided by the embodiment of the present application, the length of the virtual pixel unit in the first sub-region in the first direction is greater than the length in the second direction, and the length of the virtual pixel unit in the third sub-region in the first direction is less than the length in the second direction.

[0019] The maximum film-forming height difference of the virtual pixel unit in the first sub-region in the second direction is less than the maximum film-forming height difference of the light-emitting pixel unit in the second direction.

[0020] The maximum film-forming height difference of the virtual pixel unit in the third sub-region in the first direction is less than the maximum film-forming height difference of the light-emitting pixel unit in the second direction.

[0021] The first sub-region and the third sub-region are both provided with a plurality of virtual pixel units, the plurality of virtual pixel units are arranged as virtual pixel rows in the first direction, and the plurality of virtual pixel units are arranged as virtual pixel columns in the second direction.

[0022] In the display panel provided by the embodiment of the present application, the first sub-region and the third sub-region are both provided with a plurality of virtual pixel units, in the first sub-region, the plurality of virtual pixel units include first-type virtual pixel units and second-type virtual pixel units arranged in the first direction, and the second-type virtual pixel units are located at the connection between the first sub-region and the third sub-region; in the third sub-region, the plurality of virtual pixel units include a plurality of third-type virtual pixel units arranged in the second direction.

[0023] In the second direction, the width of the third-type virtual pixel unit is less than the width of the first-type virtual pixel unit and less than the width of the second-type virtual pixel unit, and the width of the second-type virtual pixel unit is greater than the width of the first-type virtual pixel unit.

[0024] The maximum film-forming height difference of the third-type virtual pixel unit is greater than the maximum film-forming height difference of the first-type virtual pixel unit, and the maximum film-forming height difference of the third-type virtual pixel unit is greater than the maximum film-forming height difference of the second-type virtual pixel unit.

[0025] In the display panel provided by the embodiment of the present application, the display panel further comprises:

[0026] A first dam is arranged on the substrate and located in the display area.

[0027] A second dam is arranged on the substrate and crosses the first dam to form a first opening with the first dam, and the light-emitting pixel units are arranged in the first opening one by one corresponding to the first opening.

[0028] The second dam extends from the display area to the non-display area and forms a second opening in the non-display area, and the virtual pixel units are arranged in the second opening one by one corresponding to the second opening.

[0029] In the display panel provided in the embodiments of the present application, in the thickness direction of the display panel, the thickness of the second dam is greater than the thickness of the first dam, and the thickness of the second dam located in the non-display area is greater than the thickness of the second dam located in the display area.

[0030] In the display panel provided in the embodiments of the present application, the display panel further comprises:

[0031] A first electrode layer is arranged between the substrate and the light-emitting material layer, the first electrode layer comprises a plurality of first electrodes formed in the display area and a virtual electrode formed in the non-display area, the light-emitting pixel units are arranged one by one corresponding to the first electrodes, and the virtual pixel units are arranged one by one corresponding to the virtual electrode.

[0032] A second electrode layer is arranged on the side of the light-emitting material layer away from the substrate.

[0033] The substrate comprises a first transistor formed in the display area and a second transistor formed in the non-display area, the first transistor is arranged corresponding to the first electrode, and the first electrode is electrically connected to the first transistor, the second transistor is arranged corresponding to the virtual electrode, and the virtual electrode is electrically isolated from the second transistor.

[0034] The embodiments of the present application also provide a display panel, which comprises:

[0035] A substrate;

[0036] A light-emitting material layer is arranged on the substrate, and the light-emitting material layer comprises a plurality of light-emitting pixel units, the plurality of light-emitting pixel units comprise first color light-emitting pixel units, second color light-emitting pixel units and third color light-emitting pixel units, the first color light-emitting pixel units are red light-emitting pixel units, the second color light-emitting pixel units are green light-emitting pixel units, and the third color light-emitting pixel units are blue light-emitting pixel units.

[0037] The maximum film forming height difference of the second color light emitting pixel unit is less than the maximum film forming height difference of the first color light emitting pixel unit, and the maximum film forming height difference of the second color light emitting pixel unit is less than the maximum film forming height difference of the third color light emitting pixel unit.

[0038] In the display panel provided by the embodiment of the present application, the minimum film forming height of the first color light emitting pixel unit is greater than the minimum film forming height of the second color light emitting pixel unit, and the minimum film forming height of the second color light emitting pixel unit is greater than the minimum film forming height of the third color light emitting pixel unit.

[0039] The maximum film forming height of the first color light emitting pixel unit is greater than the maximum film forming height of the second color light emitting pixel unit, and the maximum film forming height of the second color light emitting pixel unit is greater than the maximum film forming height of the third color light emitting pixel unit.

[0040] In the display panel provided by the embodiment of the present application, the minimum film forming height of the first color light emitting pixel unit is greater than the maximum film forming height of the second color light emitting pixel unit, and the minimum film forming height of the second color light emitting pixel unit is greater than the maximum film forming height of the third color light emitting pixel unit.

[0041] In the display panel provided by the embodiment of the present application, the maximum film forming height difference between any two of the first color light emitting pixel unit, the second color light emitting pixel unit and the third color light emitting pixel unit is less than 10 nanometers.

[0042] The embodiment of the present application also provides a display device comprising the display panel of any one of the foregoing embodiments.

[0043] The display panel and the display device provided by the application have the following beneficial effects: the display panel comprises a display area and a non-display area located at least one side of the display area, the display area is provided with a plurality of light-emitting pixel units, and the non-display area is provided with at least one virtual pixel unit, the area of the virtual pixel unit is greater than the area of the light-emitting pixel unit of the display area, and the maximum film-forming height difference of the virtual pixel unit is less than the maximum film-forming height difference of the light-emitting pixel unit. In this way, when the inkjet printing film-forming light-emitting material layer is adopted, the area of the large-area virtual pixel unit can accommodate more printing ink, so as to create a large amount of solvent atmosphere in the area to eliminate the influence of uneven vacuum drying, thereby improving the uniformity of film-forming of the light-emitting pixel unit in the display area. Alternatively, the display panel comprises a plurality of light-emitting pixel units, the plurality of light-emitting pixel units comprise first color light-emitting pixel units, second color light-emitting pixel units and third color light-emitting pixel units, the first color light-emitting pixel units are red light-emitting pixel units, the second color light-emitting pixel units are green light-emitting pixel units, and the third color light-emitting pixel units are blue light-emitting pixel units. The maximum film-forming height difference of the second color light-emitting pixel unit is less than the maximum film-forming height difference of the first color light-emitting pixel unit, and the maximum film-forming height difference of the second color light-emitting pixel unit is less than the maximum film-forming height difference of the third color light-emitting pixel unit, so as to improve the uniformity of film-forming of the light-emitting pixel unit. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0045] Figure 1 A planar structure schematic diagram of the display panel provided by the embodiment of the application.

[0046] Figure 2 For Figure 1 A sectional structure schematic diagram in the direction of M-M'.

[0047] Figure 3 For Figure 2 A detailed structure schematic diagram of the substrate.

[0048] Figure 4 Another planar structure schematic diagram of the display panel provided by the embodiment of the application.

[0049] Figure 5 Another planar structure schematic diagram of the display panel provided by the embodiment of the application.

[0050] Figure 6 Another schematic diagram of a planar structure of a display panel provided by an embodiment of the present application.

[0051] Figure 7a For Figure 5 A schematic diagram of a curve of a film thickness variation of two first-color light-emitting pixel units in a second direction.

[0052] Figure 7b For Figure 5 A schematic diagram of a curve of a film thickness variation of two second-color light-emitting pixel units in a second direction.

[0053] Figure 7c For Figure 5 A schematic diagram of a curve of a film thickness variation of two third-color light-emitting pixel units in a second direction. DETAILED DESCRIPTION

[0054] The following description of the embodiments is provided as an example to illustrate specific embodiments that can be implemented by the present application. The directional terms mentioned in the present application, such as [up], [down], [front], [back], [left], [right], [inward], [outward], [side] and the like, are only with reference to the direction of the accompanying drawings. Therefore, the directional terms used are used to illustrate and understand the present application, and not to limit the present application. In the drawings, similar units are denoted by the same reference numerals. In the drawings, the thicknesses of some layers and regions are exaggerated for clear understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited thereto.

[0055] In view of the poor film forming uniformity when forming light-emitting pixels by using an inkjet printing process, the inventors of the present application found in research that, due to the influence of the printing ink characteristics and the drying uniformity of the vacuum drying equipment, the film forming uniformity of the four corners and the edges of the display panel is poor, and the phenomenon of the four corners being more serious than the edges is exhibited. Therefore, dummy pixels can be arranged in a non-display area outside the display area, the dummy pixels in the non-display area and the light-emitting pixels in the display area are formed by printing the same printing ink on the substrate by using an inkjet printing process and drying, and the size and shape of the dummy pixels match those of the light-emitting pixels. The area where the dummy pixels are located can be used as the edge part of the light-emitting pixels in the display area, so that the edges with uneven film thickness after drying are located in the area where the dummy pixels are located, to ensure the film forming uniformity of the light-emitting pixels in the display area and the uniformity of the light-emitting pixel brightness. Among them, the dummy pixels and the light-emitting pixels are both structures actually existing on the display panel, and the difference between them is that the light-emitting pixels emit light for displaying the picture of the display panel, while the dummy pixels do not emit light, and are mainly used to improve the film forming uniformity of the light-emitting pixels in the display area.

[0056] To ensure that the four corners and edges of the uneven film thickness are all within the area where the virtual pixels are located, a large number of virtual pixels need to be set in the non-display area as a buffer. However, a large number of virtual pixels require a large space, and since virtual pixels are not used for light emission, the area where virtual pixels are located is an ineffective area for light emission. This results in a large area of ​​non-display area, which makes it difficult to achieve a narrow bezel on the display panel.

[0057] Therefore, the inventors of this application propose a display panel and a display device.

[0058] Please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of a planar structure of a display panel provided in an embodiment of this application. Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along the M-M' direction. Figure 3 for Figure 2 A detailed structural diagram of the middle substrate. (Refer to...) Figure 1 and Figure 2 The display panel 100 includes a display area AA and a non-display area NA located on at least one side of the display area AA. The display area AA is used to display images, and the non-display area NA does not display images. The display panel 100 also includes a substrate 10 and a light-emitting material layer 20 disposed on the substrate 10. The light-emitting material layer 20 includes a plurality of light-emitting pixel units 21 formed in the display area AA and at least one virtual pixel unit 22 formed in the non-display area NA.

[0059] The area of ​​the virtual pixel unit 22 is larger than the area of ​​the light-emitting pixel unit 21, and the maximum film-forming height difference of the virtual pixel unit 22 is smaller than the maximum film-forming height difference of the light-emitting pixel unit 21. Thus, when using inkjet printing to form the light-emitting material layer 20, the area forming the large-area virtual pixel unit 22 can accommodate more printing ink, creating a large solvent atmosphere in that area to eliminate the effects of uneven vacuum drying, thereby improving the uniformity of film formation of the light-emitting pixel units 21 within the display area AA. Furthermore, by setting a large-area virtual pixel unit 22 larger than the light-emitting pixel unit 21 in the display area AA, compared to setting a larger number of virtual pixels matching the shape and size of the light-emitting pixels in the display area AA, the same film-forming uniformity can be achieved while reducing the area of ​​the non-display area NA occupied by the dam used to enclose the virtual pixels, thus facilitating the achievement of a narrow bezel. Both the virtual pixel unit 22 and the light-emitting pixel unit 21 are structures that actually exist on the display panel 100. The difference is that the light-emitting pixel unit 21 emits light for displaying images on the display panel 100, while the virtual pixel unit 22 does not emit light.

[0060] The area of each virtual pixel unit 22 is much larger than the area of each light-emitting pixel unit 21, for example, the area of a single virtual pixel unit 22 is 3 times or more than the area of a single light-emitting pixel unit 21, that is, the area of each virtual pixel unit 22 is 3 times or more than the area of each light-emitting pixel unit 21, for example, 3 times, 4 times, 5 times, 6 times, 10 times, 20 times, 30 times, etc. The upper limit of the area of the virtual pixel unit 22 can depend on the actual narrow frame size required by the display panel 100.

[0061] The maximum film formation height difference of the virtual pixel unit 22 is 0.5 times or less than the maximum film formation height difference of the light-emitting pixel unit 21, for example, 0.5 times, 0.49 times, 0.45 times, 0.4 times, 0.35 times, 0.3 times, 0.2 times, 0.1 times, etc. The maximum film formation height difference of the virtual pixel unit 22 refers to the difference between the maximum film layer thickness and the minimum film layer thickness of the virtual pixel unit 22 after the light-emitting material layer 20 is formed. Correspondingly, the maximum film formation height difference of the light-emitting pixel unit 21 refers to the difference between the maximum film layer thickness and the minimum film layer thickness of the light-emitting pixel unit 21.

[0062] In some embodiments, the maximum film formation height of the virtual pixel unit 22 is less than 50 nanometers, for example, 49 nanometers, 45 nanometers, 40 nanometers, 35 nanometers, 30 nanometers, 28 nanometers, 25 nanometers, 23 nanometers, 22 nanometers, 20 nanometers, 18 nanometers, 15 nanometers, 10 nanometers, etc. The maximum film formation height difference of the virtual pixel unit 22 is less than the maximum film formation height difference of the light-emitting pixel unit 21.

[0063] Optionally, a plurality of light-emitting pixel units 21 are arranged in light-emitting pixel rows in a first direction X, and a plurality of light-emitting pixel units 21 are arranged in light-emitting pixel columns in a second direction Y, the first direction X and the second direction Y are arranged intersecting, for example, the first direction X and the second direction Y are perpendicular, the first direction X is the horizontal direction, and the second direction Y is the vertical direction. The length of the light-emitting pixel unit 21 in the first direction X is greater than the length in the second direction Y.

[0064] The plurality of light-emitting pixel units 21 include first color light-emitting pixel units 21-R, second color light-emitting pixel units 21-G, and third color light-emitting pixel units 21-B. Optionally, the first color light-emitting pixel unit 21-R is a red light-emitting pixel unit 21, the second color light-emitting pixel unit 21-G is a green light-emitting pixel unit 21, and the third color light-emitting pixel unit 21-B is a blue light-emitting pixel unit 21.

[0065] In some embodiments, the first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G and the third color light emitting pixel unit 21-B have the same area, the maximum film forming height difference of the second color light emitting pixel unit 21-G is less than the maximum film forming height difference of the first color light emitting pixel unit 21-R, and the maximum film forming height difference of the second color light emitting pixel unit 21-G is less than the maximum film forming height difference of the third color light emitting pixel unit 21-B. The difference between the maximum film forming height difference of any two of the first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G and the third color light emitting pixel unit 21-B is less than 30 nanometers, such as the maximum film forming height difference of the second color light emitting pixel unit 21-G is 30 nanometers less than the maximum film forming height difference of the first color light emitting pixel unit 21-R, and such as the maximum film forming height difference of the second color light emitting pixel unit 21-G is 30 nanometers less than the maximum film forming height difference of the third color light emitting pixel unit 21-B.

[0066] The first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G and the third color light emitting pixel unit 21-B are arranged in the second direction Y in turn, a plurality of first color light emitting pixel units 21-R are arranged in the first direction X to form a light emitting pixel row, a plurality of second color light emitting pixel units 21-G are arranged in the first direction X to form a light emitting pixel row, and a plurality of third color light emitting pixel units 21-B are arranged in the first direction X to form a light emitting pixel row, that is, light emitting pixel units 21 of the same color are arranged in the first direction X to form a light emitting pixel row, so that the same color of printing ink can be printed on the light emitting pixel row by using the inkjet printing process, to realize linear inkjet printing, improve the efficiency of inkjet printing, and reduce the risk of color crosstalk between adjacent light emitting pixel units 21. In the present application, the printing ink is formed by mixing the corresponding color of organic light emitting material into a high-boiling-point solvent to form a printing ink of the corresponding color. For example, in the present application, the printing ink for forming a red light emitting pixel unit 21 is formed by mixing a red organic light emitting material into a high-boiling-point solvent, the printing ink for forming a green light emitting pixel unit 21 is formed by mixing a green organic light emitting material into a high-boiling-point solvent, and the printing ink for forming a blue light emitting pixel unit 21 is formed by mixing a blue organic light emitting material into a high-boiling-point solvent. The high-boiling-point solvent refers to a solvent with a boiling point higher than 150°C, such as one of 1,4-diphenylbutane, isoamyl benzoate, etc.

[0067] It should be noted that, Figure 1Only part of the first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G and the third color light emitting pixel unit 21-B are shown, but the present application is not limited thereto, and the arrangement of the light emitting pixel unit 21 in the embodiment is only an example, and the present application is also not limited thereto. For example, the same color light emitting pixel units 21 of the present application can also be arranged in pixel columns in the second direction Y, and light emitting pixel units 21 of different colors are arranged in pixel rows in the first direction X.

[0068] With continuous reference to Figure 1 The non-display area NA includes oppositely arranged first and second sub-areas NA1 and NA2, the display area AA is adjacent to the first and second sub-areas NA1 and NA2, the virtual pixel units 22 are arranged in the first and second sub-areas NA1 and NA2, and the virtual pixel units 22 in the first sub-area NA1 are centrally symmetric to the virtual pixel units 22 in the second sub-area NA2. In the second direction Y, the light emitting pixel rows are located between the first and second sub-areas NA1 and NA2, that is, the first and second sub-areas NA1 and NA2 are spaced apart in the second direction Y.

[0069] The non-display area NA further includes oppositely arranged third and fourth sub-areas NA3 and NA4, the third and fourth sub-areas NA3 and NA4 are located between the first and second sub-areas NA1 and NA2, the virtual pixel units 22 are arranged in the third and fourth sub-areas NA3 and NA4, the virtual pixel units 22 in the third sub-area NA3 are centrally symmetric to the virtual pixel units 22 in the fourth sub-area NA4, and the virtual pixel units 22 in the first sub-area NA1, the third sub-area, the second sub-area NA2 and the fourth sub-area NA4 surround the display area AA. For example, the virtual pixel units 22 in the first sub-area NA1, the third sub-area, the second sub-area NA2 and the fourth sub-area NA4 are sequentially connected end to end to form a ring-shaped virtual pixel unit 22 to maximize the narrow frame.

[0070] The length of the virtual pixel unit 22 in the first direction X is greater than the length of the virtual pixel unit 22 in the second direction Y in the first sub-area NA1 and the second sub-area NA2, and the length of the virtual pixel unit 22 in the first direction X is less than the length of the virtual pixel unit 22 in the second direction Y in the third sub-area NA3 and the fourth sub-area NA4. The length of the light-emitting pixel unit 21 in the first direction X is greater than the length of the light-emitting pixel unit 21 in the second direction Y. Optionally, the length of the virtual pixel unit 22 in the second direction Y in the first sub-area NA1 and the second sub-area NA2 is greater than or equal to the length of the light-emitting pixel unit 21 in the second direction Y; and the length of the virtual pixel unit 22 in the first direction X in the third sub-area NA3 and the fourth sub-area NA4 is greater than or equal to the length of the light-emitting pixel unit 21 in the second direction Y.

[0071] The maximum film-forming height difference of the virtual pixel unit 22 in the second direction Y in the first sub-area NA1 is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y, the maximum film-forming height difference of the virtual pixel unit 22 in the second direction Y in the second sub-area NA2 is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y, the maximum film-forming height difference of the virtual pixel unit 22 in the first direction X in the third sub-area NA3 is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y, and the maximum film-forming height difference of the virtual pixel unit 22 in the first direction X in the fourth sub-area NA4 is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y. The maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y is greater than the maximum film-forming height difference of the light-emitting pixel unit 21 in the first direction X.

[0072] Referring to Figure 2 The display panel 100 further comprises a first dam 30 and a second dam 40 disposed on the substrate 10. The first dam 30 is located in the display area AA, and the second dam 40 is located in the display area AA and extends from the display area AA to the non-display area NA. In the display area AA, the second dam 40 crosses the first dam 30 and forms a first opening 401 with the first dam 30, and the light-emitting pixel unit 21 is located in the first opening 401 and is disposed one-to-one with the first opening 401, that is, one light-emitting pixel unit 21 is disposed in one first opening 401, and one light-emitting pixel unit 21 is located in one first opening 401.

[0073] In the non-display area NA, the second dam 40 forms a second opening 402, and the virtual pixel unit 22 is arranged in the second opening 402 in a one-to-one correspondence, that is, one virtual pixel unit 22 is arranged in each second opening 402, and one virtual pixel unit 22 is arranged in one second opening 402. The opening area of the second opening 402 is much larger than the opening area of the first opening 401, for example, the opening area of the second opening 402 is 3 times or more, for example, 3 times, 4 times, 5 times, 6 times, 10 times, 20 times, 30 times, etc. of the opening area of the first opening 401.

[0074] In the thickness direction of the display panel 100, the thickness of the second dam 40 is greater than the thickness of the first dam 30, and the thickness of the second dam 40 in the non-display area NA is greater than the thickness of the second dam 40 in the display area AA, so as to increase the accommodation space of the second opening 402, so that the second opening 402 can accommodate more printing ink, and under the premise of ensuring the same film forming uniformity effect, the opening area of the second opening 402 can be appropriately reduced, thereby further reducing the frame width of the display panel 100, and more conducive to realizing narrow frame. The first dam 30 and the second dam 40 can be formed of an organic material.

[0075] Continuing to refer to Figure 2 The display panel 100 further includes opposite first and second electrode layers 50 and 60. The first electrode layer 50 is arranged between the substrate 10 and the light-emitting material layer 20, and includes a plurality of first electrodes 51 formed in the display area AA and a virtual electrode 52 formed in the non-display area NA. The light-emitting pixel unit 21 is arranged in a one-to-one correspondence with the first electrode 51, and the virtual pixel unit 22 is arranged in a one-to-one correspondence with the virtual electrode 52. That is, one first electrode 51 corresponds to one light-emitting pixel unit 21, and one first electrode 51 corresponds to one first opening 401, and the first opening 401 exposes at least part of the first electrode 51. One virtual electrode 52 corresponds to one virtual pixel unit 22, and one second electrode corresponds to one second opening 402, and the second opening 402 exposes at least part of the virtual electrode 52.

[0076] The second electrode layer 60 is arranged on the side of the light-emitting material layer 20 away from the substrate 10, and is arranged in an integral layer. Optionally, the first electrode 51 is an anode, and the second electrode layer 60 is a cathode. The light-emitting pixel unit 21 emits light under the common action of the first electrode 51 and the second electrode layer 60, and the virtual pixel unit 22 does not emit light.

[0077] With reference to Figure 3 , the substrate 10 includes a substrate 11, and a first transistor 12 and a second transistor 13 disposed on the substrate 11, the first transistor 12 is formed in the display area AA, the second transistor 13 is formed in the non-display area NA, the first transistor 12 is disposed corresponding to the first electrode 51, and the first electrode 51 is electrically connected with the first transistor 12, the second transistor 13 is disposed corresponding to the dummy electrode 52, and the dummy electrode 52 is electrically isolated from the second transistor 13.

[0078] Optionally, the substrate 10 further includes a bridge electrode disposed between the first transistor 12 and the first electrode 51, and the first electrode 51 is connected with the corresponding first transistor 12 through the bridge electrode.

[0079] The substrate 11 includes a first sub-substrate 111, a barrier layer 112, a second sub-substrate 113 and a buffer layer 114 which are stacked, wherein the materials of the first sub-substrate 111 and the second sub-substrate 113 include polyimide and the like, and the materials of the barrier layer 112 and the buffer layer 114 include inorganic materials such as silicon oxide and silicon nitride.

[0080] The first transistor 12 includes an active layer 121, a first gate 122, a third electrode 123, a source 124 and a drain 125. Of course, the substrate 10 further includes a plurality of insulating layers, such as a first gate insulating layer 141 between the active layer 121 and the first gate 122, a second gate insulating layer 142 between the first gate 122 and the third electrode 123, an interlayer insulating layer 143 between the third electrode 123 and the source 124 and the drain 125, a first planar layer 144 between the source 124, the drain 125 and the bridge electrode, a second planar layer 145 between the bridge electrode and the first electrode 51, and the first dam 30 and the second dam 40 are located on part of the first electrode 51 and the second planar layer 145. The structure of the second transistor 13 is the same as that of the first transistor 12, which will not be described here.

[0081] The difference between the substrate 10 in the non-display area NA and the display area AA is that the second planarization layer 145 forms a first via in the display area AA, but does not form a corresponding via in the non-display area NA. The first electrode 51 is connected to the bridging electrode through the first via. The first planarization layer 144 forms a second via in the display area AA, but does not form a corresponding via in the non-display area NA. The bridging electrode is connected to the first transistor 12 through the second via. The first planarization layer 144 and the second planarization layer 145 are located between the virtual electrode 52 and the second transistor 13, so that the virtual electrode 52 is electrically isolated from the second transistor 13.

[0082] In one embodiment, reference is made to... Figures 1 to 4 , Figure 4 This is a schematic diagram of another planar structure of the display panel 100 provided in an embodiment of this application, referring to... Figure 4 ,and Figure 1 The difference in the example display panel 100 is that the non-display area NA of the display panel 100 includes a first sub-area NA1 and a second sub-area NA2, but does not have a third sub-area NA3 and a fourth sub-area NA4, in order to further reduce the bezel of the display panel 100. The virtual pixel unit 22 is located within the first sub-area NA1 and the second sub-area NA2. The first sub-area NA1, the display area NA1, and the second sub-area NA2 are arranged sequentially in the second direction Y. Other descriptions are as described in the above embodiment and will not be repeated here.

[0083] In one embodiment, reference is made to... Figures 1 to 5 , Figure 5 This is a schematic diagram of another planar structure of the display panel 100 provided in the embodiments of this application, referring to... Figure 5 ,and Figure 1 The difference in the example display panel 100 is that multiple virtual pixel units 22 are provided in both the first sub-area NA1 and the third sub-area NA3, and correspondingly, multiple virtual pixel units 22 are also provided in both the second sub-area NA2 and the fourth sub-area NA4. The multiple virtual pixel units 22 are arranged in a virtual pixel row in the first direction X, and in a virtual pixel column in the second direction Y.

[0084] It should be noted that, Figure 5It is schematically shown that two virtual pixel rows and two virtual pixel columns are arranged in the first sub-area NA1 and the second sub-area NA2, and three virtual pixel rows and two virtual pixel columns are arranged in the third sub-area NA3 and the fourth sub-area NA4, but the present application is not limited thereto, and more or less virtual pixel units 22 can also be arranged in the first sub-area NA1, the second sub-area NA2, the third sub-area NA3 and the fourth sub-area NA4 in the present application, thereby forming less or more virtual pixel rows and / or virtual pixel columns. Moreover, the surface shapes of the plurality of virtual pixel units in each sub-area (including the first sub-area NA1, the second sub-area NA2, the third sub-area NA3 and the fourth sub-area NA4) are the same, such as rectangular, and of course the shapes of the virtual pixel units 22 are not limited to Figure 5 rectangular, the virtual pixel units 22 can also be other regular or irregular shapes; the arrangement rules of the plurality of virtual pixel units in each sub-area (including the first sub-area NA1, the second sub-area NA2, the third sub-area NA3 and the fourth sub-area NA4) are the same, such as the plurality of virtual pixel units in each sub-area are arranged in an array, and of course the arrangement of the virtual pixel units 22 is not limited to Figure 5 array arrangement, the virtual pixel units 22 can also be other ordered or unordered arrangements.

[0085] The length of each virtual pixel unit 22 in the first sub-area NA1 and the second sub-area NA2 in the first direction X is greater than the length in the second direction Y, and the length of each virtual pixel unit 22 in the third sub-area NA3 and the fourth sub-area NA4 in the first direction X is less than the length in the second direction Y. The maximum film-forming height difference of each virtual pixel unit 22 in the first sub-area NA1 in the second direction Y is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y, the maximum film-forming height difference of each virtual pixel unit 22 in the second sub-area NA2 in the second direction Y is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y, the maximum film-forming height difference of each virtual pixel unit 22 in the third sub-area NA3 in the first direction X is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y, and the maximum film-forming height difference of each virtual pixel unit 22 in the fourth sub-area NA4 in the first direction X is less than the maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y. The maximum film-forming height difference of the light-emitting pixel unit 21 in the second direction Y is greater than the maximum film-forming height difference in the first direction X.

[0086] In an embodiment, with reference to Figures 1 to 6 , Figure 6This is a schematic diagram of another planar structure of the display panel 100 provided in the embodiments of this application, referring to... Figure 6 ,and Figure 5 The difference in the example display panel 100 is that both the first sub-region NA1 and the third sub-region NA3 are provided with a plurality of virtual pixel units 22. In the first sub-region NA1, the plurality of virtual pixel units 22 include a first type of virtual pixel unit 22-1 and a second type of virtual pixel unit 22-2 arranged in the first direction X, and the second type of virtual pixel unit 22-2 is located at the connection between the first sub-region NA1 and the third sub-region NA3. In the third sub-region NA3, the plurality of virtual pixel units 22 include a plurality of third type of virtual pixel units 22-3 arranged in the second direction Y.

[0087] In the second direction Y, the width of the third type of virtual pixel unit 22-3 is smaller than the width of the first type of virtual pixel unit 22-1 and smaller than the width of the second type of virtual pixel unit 22-2, and the width of the second type of virtual pixel unit 22-2 is greater than the width of the first type of virtual pixel unit 22-1.

[0088] The maximum film-forming height difference of the third type of virtual pixel unit 22-3 is greater than the maximum film-forming height difference of the first type of virtual pixel unit 22-1, and the maximum film-forming height difference of the third type of virtual pixel unit 22-3 is greater than the maximum film-forming height difference of the second type of virtual pixel unit 22-2.

[0089] In some embodiments, refer to Figures 1 to 6 The display panel 100 includes a substrate 10 and a light-emitting material layer 20 disposed on the substrate 10. The light-emitting material layer 20 includes a plurality of light-emitting pixel units 21, each of which includes a first-color light-emitting pixel unit 21-R, a second-color light-emitting pixel unit 21-G, and a third-color light-emitting pixel unit 21-B. The first-color light-emitting pixel unit 21-R is a red light-emitting pixel unit, the second-color light-emitting pixel unit 21-G is a green light-emitting pixel unit, and the third-color light-emitting pixel unit 21-B is a blue light-emitting pixel unit. The maximum film-forming height difference of the second-color light-emitting pixel unit 21-G is less than the maximum film-forming height difference of the first-color light-emitting pixel unit 21-R, and the maximum film-forming height difference of the second-color light-emitting pixel unit 21-G is less than the maximum film-forming height difference of the third-color light-emitting pixel unit 21-B.

[0090] Specifically, the display panel 100 comprises a display area AA and a non-display area NA located at least one side of the display area AA, the display area AA is used for displaying a picture, and the non-display area NA does not display a picture. The light-emitting material layer 20 comprises a plurality of light-emitting pixel units 21 formed in the display area AA. A plurality of light-emitting pixel units 21 are arranged in a light-emitting pixel row in a first direction X, a plurality of light-emitting pixel units 21 are arranged in a light-emitting pixel column in a second direction Y, and the first direction X and the second direction Y are arranged perpendicularly, such as the first direction X and the second direction Y being perpendicular, the first direction X being a horizontal direction, and the second direction Y being a vertical direction. The length of the light-emitting pixel unit 21 in the first direction X is greater than the length in the second direction Y.

[0091] The first color light-emitting pixel unit 21-R, the second color light-emitting pixel unit 21-G, and the third color light-emitting pixel unit 21-B are arranged in the second direction Y in turn, a plurality of first color light-emitting pixel units 21-R are arranged in a light-emitting pixel row in the first direction X, a plurality of second color light-emitting pixel units 21-G are arranged in a light-emitting pixel row in the first direction X, and a plurality of third color light-emitting pixel units 21-B are arranged in a light-emitting pixel row in the first direction X, that is, light-emitting pixel units 21 of the same color are arranged in a light-emitting pixel row in the first direction X, so that the same color of printing ink can be printed on the light-emitting pixel row by using the inkjet printing process, to realize linear inkjet printing, improve the efficiency of inkjet printing, and reduce the risk of color crosstalk between adjacent light-emitting pixel units 21 during inkjet printing. In the present application, the printing ink is formed by mixing the corresponding color of organic light-emitting material into a high-boiling-point solvent to form a printing ink of the corresponding color, such as in the present application, the printing ink for forming the red light-emitting pixel unit 21 is formed by mixing red organic light-emitting material into a high-boiling-point solvent, the printing ink for forming the green light-emitting pixel unit 21 is formed by mixing green organic light-emitting material into a high-boiling-point solvent, and the printing ink for forming the blue light-emitting pixel unit 21 is formed by mixing blue organic light-emitting material into a high-boiling-point solvent. The high-boiling-point solvent refers to a solvent with a boiling point higher than 150°C, such as one of 1,4-diphenylbutane, isoamyl benzoate, etc.

[0092] Thus, the present application forms high-boiling ink by mixing different color light emitting materials into high-boiling solvent, and forms the light emitting pixel unit 21 by printing the high-boiling ink. In the light emitting pixel unit 21, the maximum film forming height difference of the second color light emitting pixel unit 21-G is less than the maximum film forming height difference of the first color light emitting pixel unit 21-R, and the maximum film forming height difference of the second color light emitting pixel unit 21-G is less than the maximum film forming height difference of the third color light emitting pixel unit 21-B. In the light emitting pixel unit 21 formed by printing the high-boiling ink, the maximum film forming height difference of each light emitting pixel unit 21 is small, which can improve the uniformity of the film forming of the light emitting pixel unit 21.

[0093] In some embodiments, the areas of the first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G and the third color light emitting pixel unit 21-B are the same, and the maximum film forming height difference between any two of the first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G and the third color light emitting pixel unit 21-B is less than 10 nanometers, i.e., the difference of the maximum film forming height difference of each light emitting pixel unit 21 is small. For example, the maximum film forming height difference of the second color light emitting pixel unit 21-G is 10 nanometers less than the maximum film forming height difference of the first color light emitting pixel unit 21-R, for another example, the maximum film forming height difference of the second color light emitting pixel unit 21-G is 10 nanometers less than the maximum film forming height difference of the third color light emitting pixel unit 21-B, and for yet another example, the difference between the maximum film forming height difference of the first color light emitting pixel unit 21-R and the maximum film forming height difference of the third color light emitting pixel unit 21-B is less than 10 nanometers.

[0094] In some embodiments, the maximum film formation height difference of the first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G and the third color light emitting pixel unit 21-B are all less than 35 nanometers, such as the maximum film formation height difference of the first color light emitting pixel unit 21-R is less than or equal to 33 nanometers, for example, 33 nanometers, 32 nanometers, 31 nanometers, 30 nanometers, 29 nanometers, 28 nanometers, 27 nanometers, 26 nanometers, 25 nanometers, 20 nanometers, 18 nanometers, 16 nanometers, 14 nanometers, 12 nanometers, 10 nanometers, etc.; the maximum film formation height difference of the second color light emitting pixel unit 21-G is less than or equal to 29 nanometers, for example, 29 nanometers, 28 nanometers, 27 nanometers, 26 nanometers, 25 nanometers, 23 nanometers, 22 nanometers, 21 nanometers, 20 nanometers, 18 nanometers, 16 nanometers, 14 nanometers, 12 nanometers, 10 nanometers, etc.; the maximum film formation height difference of the third color light emitting pixel unit 21-B is less than or equal to 33 nanometers, for example, 33 nanometers, 32 nanometers, 31 nanometers, 30 nanometers, 29 nanometers, 28 nanometers, 27 nanometers, 26 nanometers, 25 nanometers, 20 nanometers, 18 nanometers, 16 nanometers, 14 nanometers, 12 nanometers, 10 nanometers, etc.

[0095] In some embodiments, the minimum film formation height of the first color light emitting pixel unit 21-R is greater than the minimum film formation height of the second color light emitting pixel unit 21-G, and the minimum film formation height of the second color light emitting pixel unit 21-G is greater than the minimum film formation height of the third color light emitting pixel unit 21-B. The maximum film formation height of the first color light emitting pixel unit 21-R is greater than the maximum film formation height of the second color light emitting pixel unit 21-G, and the maximum film formation height of the second color light emitting pixel unit 21-G is greater than the maximum film formation height of the third color light emitting pixel unit 21-B.

[0096] The minimum film formation height of the first color light emitting pixel unit 21-R is greater than the maximum film formation height of the second color light emitting pixel unit 21-G, and the minimum film formation height of the second color light emitting pixel unit 21-G is greater than the maximum film formation height of the third color light emitting pixel unit 21-B. For example, the film formation thickness of the first color light emitting pixel unit 21-R ranges from 180 nanometers to 230 nanometers; the film formation thickness of the second color light emitting pixel unit 21-G ranges from 130 nanometers to 179 nanometers; and the film formation thickness of the third color light emitting pixel unit 21-B ranges from 80 nanometers to 129 nanometers.

[0097] In some embodiments, each of the light emitting pixel units 21 comprises an intermediate region and an edge region surrounding the intermediate region, the area of the intermediate region is greater than the area of the edge region. The maximum film thickness of the intermediate region is less than the maximum film thickness of the edge region, and the film thickness at the junction of the intermediate region and the edge region is less than the maximum film thickness of the intermediate region. The minimum film thickness of the light emitting pixel unit 21 is located at the junction of the intermediate region and the edge region. The maximum film height difference of the light emitting pixel unit 21 in the intermediate region is a first film height difference, and the maximum film height difference of the light emitting pixel unit 21 in the edge region is a second film height difference, the first film height difference is less than the second film height difference, and the second film height difference is the maximum film height difference of the corresponding light emitting pixel unit 21. Wherein, the first film height difference refers to the difference between the maximum film thickness of the light emitting pixel unit 21 in the intermediate region and the minimum film thickness of the light emitting pixel unit 21, and the second film height difference refers to the difference between the maximum film thickness of the light emitting pixel unit 21 in the edge region and the minimum film thickness of the light emitting pixel unit 21.

[0098] In some embodiments, the first film height difference of the first color light emitting pixel unit 21-R is greater than the first film height difference of the second color light emitting pixel unit 21-G, and the first film height difference of the first color light emitting pixel unit 21-R is less than the first film height difference of the third color light emitting pixel unit 21-B. Wherein, the first film height difference of the first color light emitting pixel unit 21-R, the second color light emitting pixel unit 21-G, and the third color light emitting pixel unit 21-B is less than 10 nanometers, such as the first film height difference of the first color light emitting pixel unit 21-R is less than or equal to 8 nanometers, for example, 8 nanometers, 7 nanometers, 6 nanometers, 5 nanometers, 4 nanometers, 3 nanometers, 2 nanometers, 1 nanometer, etc., the first film height difference of the second color light emitting pixel unit 21-G is less than or equal to 5 nanometers, for example, 5 nanometers, 4 nanometers, 3 nanometers, 2 nanometers, 1 nanometer, etc., and the first film height difference of the third color light emitting pixel unit 21-B is less than or equal to 9 nanometers, for example, 9 nanometers, 8 nanometers, 7 nanometers, 6 nanometers, 5 nanometers, 4 nanometers, 3 nanometers, 2 nanometers, 1 nanometer, etc.

[0099] In some embodiments, the film thickness of the first color light emitting pixel unit 21-R decreases first and then increases from the intermediate region to the edge region, the film thickness of the second color light emitting pixel unit 21-G decreases first and then increases from the intermediate region to the edge region, and the film thickness of the third color light emitting pixel unit 21-B decreases first and then increases from the intermediate region to the edge region.

[0100] In some embodiments, the light-emitting material layer 20 further comprises at least one virtual pixel unit 22 formed in the non-display area NA. The area of the virtual pixel unit 22 is larger than the area of the light-emitting pixel unit 21, and the maximum film-forming height difference of the virtual pixel unit 22 is smaller than the maximum film-forming height difference of the light-emitting pixel unit 21. In this way, when the inkjet printing is used to form the light-emitting material layer 20, the area of the large-area virtual pixel unit 22 can accommodate more printing ink to create a large amount of solvent atmosphere in the area to eliminate the influence of uneven vacuum drying, thereby further improving the uniformity of film formation of the light-emitting pixel unit 21 in the display area AA. Moreover, compared with setting a large number of virtual pixels matching the size of the light-emitting pixel in the display area AA, setting a large-area virtual pixel unit 22 with an area larger than that of the light-emitting pixel unit 21 in the display area AA can achieve the same effect of film-forming uniformity while reducing the area of the non-display area NA occupied by the dam for enclosing the virtual pixel, thereby facilitating the realization of narrow frame. The virtual pixel unit 22 and the light-emitting pixel unit 21 are both structures actually existing on the display panel 100, and the difference between them is that the light-emitting pixel unit 21 emits light for the display panel 100 to display a picture, while the virtual pixel unit 22 does not emit light.

[0101] In some embodiments, the light-emitting material layer 20 further comprises at least one virtual pixel unit 22 formed in the non-display area NA. The area of the virtual pixel unit 22 is larger than the area of the light-emitting pixel unit 21, and the maximum film-forming height difference of the virtual pixel unit 22 is smaller than the maximum film-forming height difference of the light-emitting pixel unit 21. In this way, when the inkjet printing is used to form the light-emitting material layer 20, the area of the large-area virtual pixel unit 22 can accommodate more printing ink to create a large amount of solvent atmosphere in the area to eliminate the influence of uneven vacuum drying, thereby further improving the uniformity of film formation of the light-emitting pixel unit 21 in the display area AA. Moreover, compared with setting a large number of virtual pixels matching the size of the light-emitting pixel in the display area AA, setting a large-area virtual pixel unit 22 with an area larger than that of the light-emitting pixel unit 21 in the display area AA can achieve the same effect of film-forming uniformity while reducing the area of the non-display area NA occupied by the dam for enclosing the virtual pixel, thereby facilitating the realization of narrow frame. The virtual pixel unit 22 and the light-emitting pixel unit 21 are both structures actually existing on the display panel 100, and the difference between them is that the light-emitting pixel unit 21 emits light for the display panel 100 to display a picture, while the virtual pixel unit 22 does not emit light.

[0102] The maximum film-forming height difference of the virtual pixel unit 22 is 0.5 times or less of the maximum film-forming height difference of the light-emitting pixel unit 21, such as 0.5 times, 0.49 times, 0.45 times, 0.4 times, 0.35 times, 0.3 times, 0.2 times, 0.1 times, etc. The maximum film-forming height difference of the virtual pixel unit 22 refers to the difference between the maximum film thickness and the minimum film thickness of the virtual pixel unit 22 after the light-emitting material layer 20 is formed. Correspondingly, the maximum film-forming height difference of the light-emitting pixel unit 21 refers to the difference between the maximum film thickness and the minimum film thickness of the light-emitting pixel unit 21.

[0103] In some embodiments, the maximum film-forming height of the virtual pixel unit 22 is less than 20 nanometers, such as 19 nanometers, 15 nanometers, 12 nanometers, 11 nanometers, 10 nanometers, 9 nanometers, 8 nanometers, 7 nanometers, 6 nanometers, 5 nanometers, 4 nanometers, 3 nanometers, 2 nanometers, etc. The maximum film-forming height difference of the virtual pixel unit 22 is less than the maximum film-forming height difference of the light-emitting pixel unit 21. The structure and arrangement of the virtual pixel unit 22 can be specifically referred to the description of the foregoing embodiments, which will not be repeated here.

[0104] The following will be described in detail with an example of the display panel 100. Figure 5 The maximum film-forming height difference of the light-emitting pixel unit 21 is described in detail with an example of the display panel 100, which is shown in FIG. 1. The display panel 100 includes a plurality of light-emitting pixel units 21 and a plurality of virtual pixel units 22. The light-emitting pixel units 21 are arranged in a matrix form, and each of the light-emitting pixel units 21 is configured to emit light of a first color, a second color, or a third color. The virtual pixel units 22 are arranged in a matrix form, and each of the virtual pixel units 22 is configured to emit light of a fourth color. Figures 1 to 7c , Figure 7a The maximum film-forming height difference of the light-emitting pixel unit 21 is described in detail with an example of the display panel 100, which is shown in FIG. 1. The display panel 100 includes a plurality of light-emitting pixel units 21 and a plurality of virtual pixel units 22. The light-emitting pixel units 21 are arranged in a matrix form, and each of the light-emitting pixel units 21 is configured to emit light of a first color, a second color, or a third color. The virtual pixel units 22 are arranged in a matrix form, and each of the virtual pixel units 22 is configured to emit light of a fourth color. Figure 5 The maximum film-forming height difference of the light-emitting pixel unit 21 is described in detail with an example of the display panel 100, which is shown in FIG. 1. The display panel 100 includes a plurality of light-emitting pixel units 21 and a plurality of virtual pixel units 22. The light-emitting pixel units 21 are arranged in a matrix form, and each of the light-emitting pixel units 21 is configured to emit light of a first color, a second color, or a third color. The virtual pixel units 22 are arranged in a matrix form, and each of the virtual pixel units 22 is configured to emit light of a fourth color. Figure 7b The maximum film-forming height difference of the light-emitting pixel unit 21 is described in detail with an example of the display panel 100, which is shown in FIG. 1. The display panel 100 includes a plurality of light-emitting pixel units 21 and a plurality of virtual pixel units 22. The light-emitting pixel units 21 are arranged in a matrix form, and each of the light-emitting pixel units 21 is configured to emit light of a first color, a second color, or a third color. The virtual pixel units 22 are arranged in a matrix form, and each of the virtual pixel units 22 is configured to emit light of a fourth color. Figure 5 The maximum film-forming height difference of the light-emitting pixel unit 21 is described in detail with an example of the display panel 100, which is shown in FIG. 1. The display panel 100 includes a plurality of light-emitting pixel units 21 and a plurality of virtual pixel units 22. The light-emitting pixel units 21 are arranged in a matrix form, and each of the light-emitting pixel units 21 is configured to emit light of a first color, a second color, or a third color. The virtual pixel units 22 are arranged in a matrix form, and each of the virtual pixel units 22 is configured to emit light of a fourth color. Figure 7c The maximum film-forming height difference of the light-emitting pixel unit 21 is described in detail with an example of the display panel 100, which is shown in FIG. 1. The display panel 100 includes a plurality of light-emitting pixel units 21 and a plurality of virtual pixel units 22. The light-emitting pixel units 21 are arranged in a matrix form, and each of the light-emitting pixel units 21 is configured to emit light of a first color, a second color, or a third color. The virtual pixel units 22 are arranged in a matrix form, and each of the virtual pixel units 22 is configured to emit light of a fourth color. Figure 5 The maximum film-forming height difference of the light-emitting pixel unit 21 is described in detail with an example of the display panel 100, which is shown in FIG. 1. The display panel 100 includes a plurality of light-emitting pixel units 21 and a plurality of virtual pixel units 22. The light-emitting pixel units 21 are arranged in a matrix form, and each of the light-emitting pixel units 21 is configured to emit light of a first color, a second color, or a third color. The virtual pixel units 22 are arranged in a matrix form, and each of the virtual pixel units 22 is configured to emit light of a fourth color. Figure 7a , Figure 7b and Figure 7c In the above-mentioned embodiments, the horizontal axis represents the length value of the corresponding light-emitting pixel unit in a certain direction, and the vertical axis represents the film thickness at the corresponding length value position.

[0105] According to Figure 7a , the maximum film-forming height difference of the first color light-emitting pixel unit 21-R in the second direction Y is less than 35 nanometers, that is, the maximum film-forming height difference of the first color light-emitting pixel unit 21-R in the cross-sectional line E is less than 35 nanometers.

[0106] According to Figure 7b , the maximum film-forming height difference of the second color light-emitting pixel unit 21-G in the second direction Y is less than 30 nanometers, that is, the maximum film-forming height difference of the second color light-emitting pixel unit 21-G in the cross-sectional line E is less than 30 nanometers.

[0107] According to Figure 7c , the maximum film-forming height difference of the third color light-emitting pixel unit 21-B in the second direction Y is less than 35 nanometers, that is, the maximum film-forming height difference of the third color light-emitting pixel unit 21-B in the cross-sectional line E is less than 35 nanometers.

[0108] According to Figure 7a , Figure 7b and Figure 7cIt can be known that the maximum film forming height difference of the second color light emitting pixel unit 21-G is less than the maximum film forming height difference of the first color light emitting pixel unit 21-R, and the maximum film forming height difference of the second color light emitting pixel unit 21-G is less than the maximum film forming height difference of the third color light emitting pixel unit 21-B.

[0109] Based on the same inventive concept, the application further provides a display device, which comprises the display panel 100 of any one of the foregoing embodiments. The display device can be a display device such as an organic light emitting diode display device, and a television, a mobile phone, a tablet computer, a notebook computer, or any large-size product or component having a display function, and the embodiments are not limited thereto.

[0110] According to the foregoing embodiments, it can be known that:

[0111] The display panel and the display device provided by the application comprise a display area and a non-display area on at least one side of the display area, the display area is provided with a plurality of light emitting pixel units, and the non-display area is provided with at least one virtual pixel unit, the area of the virtual pixel unit is greater than the area of the light emitting pixel unit of the display area, and the maximum film forming height difference of the virtual pixel unit is less than the maximum film forming height difference of the light emitting pixel unit. In this way, when the inkjet printing is used to form the light emitting material layer, the area of the large-area virtual pixel unit can accommodate more printing ink, so as to create a large amount of solvent atmosphere in the area to eliminate the influence of uneven vacuum drying, thereby improving the uniformity of film forming of the light emitting pixel unit in the display area.

[0112] In the foregoing embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0113] The embodiments of the application are described in detail above, and the principle and implementation manner of the application are described by applying specific examples; the description of the foregoing embodiments is only used to help understand the technical solutions and the core idea of the application; those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A display panel, characterized by, The display panel comprises a display area and a non-display area located at least one side of the display area, and further comprises: a substrate; a light-emitting material layer disposed on the substrate, the light-emitting material layer comprising a plurality of light-emitting pixel units formed in the display area and at least one virtual pixel unit formed in the non-display area; wherein the area of the virtual pixel unit is greater than the area of the light-emitting pixel unit, the maximum film height difference of the virtual pixel unit is less than the maximum film height difference of the light-emitting pixel unit, and the maximum film height difference of the virtual pixel unit is less than 0.5 times the maximum film height difference of the light-emitting pixel unit.

2. The display panel of claim 1, wherein, The area of a single virtual pixel unit is more than 3 times the area of a single light-emitting pixel unit.

3. The display panel of claim 1, wherein, The maximum film height difference of the virtual pixel unit is less than 50 nanometers.

4. The display panel of claim 3, wherein, The plurality of light-emitting pixel units comprise first color light-emitting pixel units, second color light-emitting pixel units, and third color light-emitting pixel units, the first color light-emitting pixel units are red light-emitting pixel units, the second color light-emitting pixel units are green light-emitting pixel units, and the third color light-emitting pixel units are blue light-emitting pixel units; The maximum film height difference of the second color light-emitting pixel units is less than the maximum film height difference of the first color light-emitting pixel units, and the maximum film height difference of the second color light-emitting pixel units is less than the maximum film height difference of the third color light-emitting pixel units; wherein the difference between the maximum film height difference of any two of the first color light-emitting pixel units, the second color light-emitting pixel units, and the third color light-emitting pixel units is less than 30 nanometers.

5. The display panel of claim 1, wherein, The non-display area comprises oppositely arranged first and second sub-areas, the display area is adjacent to the first and second sub-areas, and the virtual pixel units are arranged in the first and second sub-areas, and the virtual pixel units in the first sub-area are centrally symmetric to the virtual pixel units in the second sub-area; The plurality of light-emitting pixel units are arranged in a light-emitting pixel row in a first direction and are arranged in a light-emitting pixel column in a second direction, the first direction and the second direction are arranged intersecting each other, the length of the light-emitting pixel unit in the first direction is greater than the length in the second direction, and in the second direction, the light-emitting pixel row is located between the first and second sub-areas.

6. The display panel of claim 5, wherein, The non-display area further comprises oppositely arranged third and fourth sub-areas, the third and fourth sub-areas are located between the first and second sub-areas, the virtual pixel units are arranged in the third and fourth sub-areas, the virtual pixel units in the third sub-area are centrally symmetric to the virtual pixel units in the fourth sub-area, and the virtual pixel units in the first, third, second, and fourth sub-areas surround the display area.

7. The display panel of claim 6, wherein, The length of the virtual pixel unit in the first sub-region in the first direction is greater than the length in the second direction, and the length of the virtual pixel unit in the third sub-region in the first direction is less than the length in the second direction; The maximum film height difference of the virtual pixel unit in the first sub-region in the second direction is less than the maximum film height difference of the light-emitting pixel unit in the second direction; The maximum film height difference of the virtual pixel unit in the third sub-region in the first direction is less than the maximum film height difference of the light-emitting pixel unit in the second direction; The first sub-region and the third sub-region are each provided with a plurality of virtual pixel units, the plurality of virtual pixel units are arranged in a virtual pixel row in the first direction, and the plurality of virtual pixel units are arranged in a virtual pixel column in the second direction.

8. The display panel of claim 6, wherein, The first sub-region and the third sub-region are each provided with a plurality of virtual pixel units, in the first sub-region, the plurality of virtual pixel units include first-type virtual pixel units and second-type virtual pixel units arranged in the first direction, and the second-type virtual pixel units are located at the connection between the first sub-region and the third sub-region; in the third sub-region, the plurality of virtual pixel units include a plurality of third-type virtual pixel units arranged in the second direction; In the second direction, the width of the third-type virtual pixel unit is less than the width of the first-type virtual pixel unit, and less than the width of the second-type virtual pixel unit, and the width of the second-type virtual pixel unit is greater than the width of the first-type virtual pixel unit; The maximum film height difference of the third-type virtual pixel unit is greater than the maximum film height difference of the first-type virtual pixel unit, and the maximum film height difference of the third-type virtual pixel unit is greater than the maximum film height difference of the second-type virtual pixel unit.

9. The display panel of any of claims 1-8, wherein, The display panel further comprises: A first dam is arranged on the substrate and located in the display area; A second dam is arranged on the substrate and crosses the first dam to form a first opening with the first dam, and the light-emitting pixel unit is located in the first opening and arranged one-to-one corresponding to the first opening; The second dam extends from the display area to the non-display area and forms a second opening in the non-display area, and the virtual pixel unit is located in the second opening and arranged one-to-one corresponding to the second opening.

10. The display panel of claim 9, wherein, In the thickness direction of the display panel, the thickness of the second dam is greater than the thickness of the first dam, and the thickness of the second dam located in the non-display area is greater than the thickness of the second dam located in the display area.

11. The display panel of claim 9, wherein, The display panel further comprises: A first electrode layer is arranged between the substrate and the light-emitting material layer, the first electrode layer includes a plurality of first electrodes formed in the display area and a virtual electrode formed in the non-display area, the light-emitting pixel unit is arranged one-to-one corresponding to the first electrode, and the virtual pixel unit is arranged one-to-one corresponding to the virtual electrode; A second electrode layer is disposed on the side of the light-emitting material layer away from the substrate. The substrate includes a first transistor formed in the display area and a second transistor formed in the non-display area, the first transistor is disposed corresponding to the first electrode, and the first electrode is electrically connected to the first transistor, and the second transistor is disposed corresponding to the dummy electrode, and the dummy electrode is electrically isolated from the second transistor.

12. A display panel, characterized by The display panel comprises: A substrate; A light-emitting material layer is disposed on the substrate, the light-emitting material layer includes a plurality of light-emitting pixel units, the plurality of light-emitting pixel units include first color light-emitting pixel units, second color light-emitting pixel units, and third color light-emitting pixel units, the first color light-emitting pixel units are red light-emitting pixel units, the second color light-emitting pixel units are green light-emitting pixel units, and the third color light-emitting pixel units are blue light-emitting pixel units. The maximum film height difference of the second color light-emitting pixel units is less than the maximum film height difference of the first color light-emitting pixel units, and the maximum film height difference of the second color light-emitting pixel units is less than the maximum film height difference of the third color light-emitting pixel units.

13. The display panel of claim 12, wherein, The minimum film height of the first color light-emitting pixel units is greater than the minimum film height of the second color light-emitting pixel units, and the minimum film height of the second color light-emitting pixel units is greater than the minimum film height of the third color light-emitting pixel units. The maximum film height of the first color light-emitting pixel units is greater than the maximum film height of the second color light-emitting pixel units, and the maximum film height of the second color light-emitting pixel units is greater than the maximum film height of the third color light-emitting pixel units.

14. The display panel of claim 13, wherein, The minimum film height of the first color light-emitting pixel units is greater than the maximum film height of the second color light-emitting pixel units, and the minimum film height of the second color light-emitting pixel units is greater than the maximum film height of the third color light-emitting pixel units.

15. The display panel of any one of claims 12-14, wherein, The maximum film height difference between any two of the first color light-emitting pixel units, the second color light-emitting pixel units, and the third color light-emitting pixel units is less than 10 nanometers.

16. A display device comprising: The display panel comprises: The display panel comprises:

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