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 larger than that of the light-emitting pixel unit of the display area. The maximum film-forming height difference of the virtual pixel unit is larger than that of the light-emitting pixel unit. Thus, when an 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.

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 greater 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 a single virtual pixel unit is 2 times or more than the maximum film forming height difference of a single light emitting pixel unit.

[0011] In the display panel provided by the embodiment of the present application, the area of the virtual pixel unit is 3 times or more of the area of the 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 greater than 400 nanometers, and the maximum film-forming height difference of the light-emitting pixel unit is less than 80 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 maximum film-forming height difference of the first color light-emitting pixel units is less than the maximum film-forming height difference of the second color light-emitting pixel units, and the maximum film-forming height difference of the second color light-emitting pixel units is less than the maximum film-forming height difference of the third color light-emitting pixel units.

[0014] Among them, the first color light-emitting pixel unit is a red light-emitting pixel unit, the second color light-emitting pixel unit is a green light-emitting pixel unit, and the third color light-emitting pixel unit is a blue light-emitting pixel unit.

[0015] In the display panel provided by the embodiment of the present application, the maximum film-forming height difference of the first color light-emitting pixel unit is less than 50 nanometers, the maximum film-forming height difference of the second color light-emitting pixel unit is less than 60 nanometers, and the maximum film-forming height difference of the third color light-emitting pixel unit is less than 80 nanometers.

[0016] In the display panel provided by the embodiment of the present application, the non-display area includes a first sub-area and a second sub-area arranged oppositely, the display area is adjacent to the first sub-area and the second sub-area, the virtual pixel unit is arranged in the first sub-area and the second sub-area, and the virtual pixel unit in the first sub-area is centrally symmetric to the virtual pixel unit in the second sub-area.

[0017] In the display panel provided by the embodiment of the present application, 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 intersectingly, 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 sub-area and the second sub-area.

[0018] In the display panel provided in the embodiments of the present application, the non-display area further comprises a third sub-area and a fourth sub-area arranged oppositely, the third sub-area and the fourth sub-area are both located between the first sub-area and the second sub-area, the virtual pixel units are arranged in the third sub-area and the fourth sub-area, the virtual pixel units in the third sub-area are centrally symmetric with the virtual pixel units in the fourth sub-area, and the virtual pixel units in the first sub-area, the third sub-area, the second sub-area and the fourth sub-area surround the display area.

[0019] In the display panel provided in the embodiments of the present application, the virtual pixel units in the first sub-area, the third sub-area, the second sub-area and the fourth sub-area are sequentially connected end to end.

[0020] In the display panel provided in the embodiments of the present application, the length of the virtual pixel units in the first sub-area in the first direction is greater than the length in the second direction, and the length of the virtual pixel units in the third sub-area in the first direction is less than the length in the second direction.

[0021] The maximum film height difference of the virtual pixel units in the first sub-area in the second direction is greater than the maximum film height difference of the light-emitting pixel units in the second direction.

[0022] The maximum film height difference of the virtual pixel units in the third sub-area in the first direction is greater than the maximum film height difference of the light-emitting pixel units in the second direction.

[0023] In the display panel provided in the embodiments of the present application, a plurality of virtual pixel units are arranged in the first sub-area and the third sub-area, 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.

[0024] In the display panel provided in the embodiments of the present application, a plurality of virtual pixel units are arranged in the first sub-area and the third sub-area, in the first sub-area, the plurality of virtual pixel units comprise first-type virtual pixel units and second-type virtual pixel units arranged in the first direction, the second-type virtual pixel units are located at the connection between the first sub-area and the third sub-area, and in the third sub-area, the plurality of virtual pixel units comprise a plurality of third-type virtual pixel units arranged in the second direction.

[0025] In the second direction, the width of the third-type virtual pixel units is less than the width of the first-type virtual pixel units and the width of the second-type virtual pixel units, and the width of the second-type virtual pixel units is greater than the width of the first-type virtual pixel units.

[0026] The maximum film-forming height difference of the third type of virtual pixel unit is less than the maximum film-forming height difference of the first type of virtual pixel unit, and the maximum film-forming height difference of the third type of virtual pixel unit is less than the maximum film-forming height difference of the second type of virtual pixel unit.

[0027] In the display panel provided in the embodiments of the present application, the display panel further comprises:

[0028] The first dam is arranged on the substrate and located in the display area.

[0029] The 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 arranged in the first opening and corresponds to the first opening one by one.

[0030] 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 arranged in the second opening and corresponds to the second opening one by one.

[0031] 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.

[0032] In the display panel provided in the embodiments of the present application, the display panel further comprises:

[0033] The first electrode layer is arranged between the substrate and the light-emitting material layer, and 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 unit is arranged one by one corresponding to the first electrode, and the virtual pixel unit is arranged one by one corresponding to the virtual electrode.

[0034] The second electrode layer is arranged on the side of the light-emitting material layer away from the substrate.

[0035] 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.

[0036] The embodiments of the present application also provide a display device comprising the display panel of any one of the preceding embodiments.

[0037] The display panel and the display device provided by the application have the beneficial effects that 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, 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 greater 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. BRIEF DESCRIPTION OF DRAWINGS

[0038] 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.

[0039] Figure 1 A schematic diagram of a planar structure of the display panel provided by the embodiment of the application.

[0040] Figure 2 A schematic diagram of a cross-sectional structure of the display panel provided by the embodiment of the application. Figure 1 A schematic diagram of a cross-sectional structure of the display panel provided by the embodiment of the application.

[0041] Figure 3 A schematic diagram of a cross-sectional structure of the display panel provided by the embodiment of the application. Figure 2 A schematic diagram of a cross-sectional structure of the display panel provided by the embodiment of the application.

[0042] Figure 4 A schematic diagram of another planar structure of the display panel provided by the embodiment of the application.

[0043] Figure 5 A schematic diagram of another planar structure of the display panel provided by the embodiment of the application.

[0044] Figure 6 A schematic diagram of another planar structure of the display panel provided by the embodiment of the application.

[0045] Figure 7 A schematic diagram of a cross-sectional structure of the display panel provided by the embodiment of the application. Figure 5 A schematic diagram of a curve of film layer thickness change of two first color light-emitting pixel units in a second direction.

[0046] Figure 8 A schematic diagram of a curve of film layer thickness change of two second color light-emitting pixel units in a second direction. Figure 5 A schematic diagram of a curve of film layer thickness change of two second color light-emitting pixel units in a second direction.

[0047] Figure 9 For Figure 5 A curve diagram showing the film thickness variation of two third color light emitting pixel units in the second direction in the middle.

[0048] Figure 10 For Figure 5 A curve diagram showing the film thickness variation of two virtual pixel units in the first sub-area in the second direction. DETAILED DESCRIPTION

[0049] The following description of the embodiments refers to the accompanying drawings, which are used to exemplify specific embodiments that can be used to implement 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 the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and understand the present application, not to limit the present application. In the drawings, similar structures are denoted by the same reference numerals. In the drawings, the thicknesses of some layers and regions are exaggerated for clarity of 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.

[0050] In view of the poor film forming uniformity when using an inkjet printing process to form light emitting pixels, the inventors of the present application found in research that due to the influence of printing ink characteristics and drying uniformity of vacuum drying equipment, the film forming uniformity of the four corners and 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 the 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 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.

[0051] In order to ensure that all the corners and edges with uneven film thickness are located in the area where the dummy pixels are located, more dummy pixels need to be arranged in the non-display area as a buffer, and more dummy pixels need to occupy a larger space position, and the dummy pixels are not used for light emission, and the area where the dummy pixels are located is a light emission invalid area, thereby resulting in a larger area of the non-display area, and further causing the display panel to be difficult to realize narrow frame.

[0052] To this end, the inventors of the present application propose a display panel and a display device.

[0053] Please refer to Figure 1 to Figure 3 , Figure 1 A schematic diagram of a planar structure of a display panel provided by an embodiment of the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, Figure 1 A schematic diagram of a cross-sectional structure along the direction of M-M' in FIG. 1 is shown in FIG. 2. Figure 3 As shown in FIG. 2, Figure 2 A schematic diagram of a detailed structure of a substrate in FIG. 2 is shown in FIG. 3. Please refer to Figure 1 and Figure 2 The display panel 100 includes 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 display panel 100 further 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.

[0054] The area of the virtual pixel unit 22 is greater than the area of the light-emitting pixel unit 21, and the maximum film-forming height difference of the virtual pixel unit 22 is greater 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 improving the uniformity of film formation of the light-emitting pixel unit 21 in the display area AA. Moreover, the large-area virtual pixel unit 22 with an area greater than that of the light-emitting pixel unit 21 in the display area AA can reduce the area of the non-display area NA occupied by the dam for enclosing the virtual pixel, compared with setting more virtual pixels with a size matching the light-emitting pixel in the display area AA, while achieving the same effect of film formation uniformity, thereby facilitating the realization of a 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 displaying a picture on the display panel 100, while the virtual pixel unit 22 does not emit light.

[0055] 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.

[0056] The maximum film formation height difference of the virtual pixel unit 22 is 2 times or more than the maximum film formation height difference of the light-emitting pixel unit 21, for example, 2 times, 2.1 times, 2.5 times, 3 times, 4 times, 5 times, 6 times, 7 times, etc. In an embodiment, the maximum film formation height difference of the virtual pixel unit 22 is greater than 400 nanometers, for example, 401 nanometers, 410 nanometers, 420 nanometers, 450 nanometers, 480 nanometers, 500 nanometers, 600 nanometers, etc. The maximum film formation height difference of the light-emitting pixel unit 21 is less than 80 nanometers, for example, 79 nanometers, 75 nanometers, 70 nanometers, 65 nanometers, 60 nanometers, 55 nanometers, 50 nanometers, 40 nanometers, 30 nanometers, 20 nanometers, 10 nanometers, etc.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 height difference of the first color light-emitting pixel unit 21-R is less than the maximum film height difference of the second color light-emitting pixel unit 21-G, and the maximum film height difference of the second color light-emitting pixel unit 21-G is less than the maximum film height difference of the third color light-emitting pixel unit 21-B. The maximum film height difference of the first color light-emitting pixel unit 21-R is less than 50 nanometers, such as 49 nanometers, 40 nanometers, 30 nanometers, 20 nanometers, 10 nanometers, etc.; the maximum film height difference of the second color light-emitting pixel unit 21-G is less than 60 nanometers, such as 59 nanometers, 55 nanometers, 50 nanometers, 40 nanometers, 30 nanometers, 20 nanometers, 10 nanometers, etc.; and the maximum film height difference of the third color light-emitting pixel unit 21-B is less than 80 nanometers, such as 79 nanometers, 75 nanometers, 70 nanometers, 65 nanometers, 60 nanometers, 55 nanometers, 50 nanometers, 40 nanometers, 30 nanometers, 20 nanometers, etc.

[0061] 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. In this way, the same color of printing ink can be printed on the light-emitting pixel row by using the inkjet printing process, so as 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.

[0062] In the present application, the printing ink is formed by mixing the corresponding color of organic light-emitting material into a low-boiling-point solvent to form a printing ink of the corresponding color. For example, 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 low-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 low-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 low-boiling-point solvent. The low-boiling-point solvent refers to a solvent with a boiling point lower than 100°C, such as one of dipropylene glycol, cyclohexylbenzene, and dimethyl dipyromate.

[0063] 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.

[0064] With reference to the foregoing 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.

[0065] 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.

[0066] 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.

[0067] The maximum film-forming height difference of the virtual pixel unit 22 in the second direction Y in the first sub-area NA1 is greater 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 greater 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 greater 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 greater 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.

[0068] 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 each first opening 401, and one light-emitting pixel unit 21 is located in one first opening 401.

[0069] 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.

[0070] 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.

[0071] 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. The first electrode layer 50 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. 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. The second opening 402 exposes at least part of the virtual electrode 52.

[0072] 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.

[0073] Referring 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.

[0074] Optionally, the substrate 10 further includes a bridge electrode disposed between the first transistor 12 and the first electrode 51, the first electrode 51 is connected with the corresponding first transistor 12 through the bridge electrode.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In one embodiment, reference is made to... Figure 1 to Figure 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.

[0079] In one embodiment, reference is made to... Figure 1 to Figure 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.

[0080] 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.

[0081] 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.

[0082] The maximum film-forming height difference of each virtual pixel unit 22 in the first sub-area NA1 in the second direction Y is greater 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 greater 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 greater 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 greater 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.

[0083] In an embodiment, referring to Figure 1 to Figure 6 ,Figure 6 This 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.

[0084] 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.

[0085] The maximum film-forming height difference of the third type of virtual pixel unit 22-3 is less 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 less than the maximum film-forming height difference of the second type of virtual pixel unit 22-2.

[0086] The following is based on Figure 5 Taking the example display panel 100, the difference in the maximum film height between the virtual pixel unit 22 and the light-emitting pixel unit 21 is explained in detail. Figure 1 to Figure 10 , Figure 7 for Figure 5 A schematic diagram of the film thickness variation curves of the two first-color emitting pixel units 21-R in the second direction Y. Figure 8 for Figure 5 A schematic diagram of the film thickness variation curves of the two second-color emitting pixel units 21-G in the second direction Y. Figure 9 for Figure 5 A schematic diagram of the film thickness variation curves of the two third-color emitting pixel units 21-B in the second direction Y. Figure 10 for Figure 5 A schematic diagram showing the thickness variation of the film layer in the second direction Y for two virtual pixel units 22 within the first sub-region NA1. Figure 7 , Figure 8 , Figure 9 as well as Figure 10In the figure, the abscissa represents the length value of the corresponding light-emitting pixel unit and virtual pixel unit in a certain direction, and the ordinate represents the film thickness at the corresponding length value position.

[0087] According to Figure 5 and Figure 7 It can be known that the maximum film height difference of the first color light-emitting pixel unit 21-R in the second direction Y is less than 50 nanometers, that is, the maximum film height difference of the first color light-emitting pixel unit 21-R in the profile line E is less than 50 nanometers; wherein, Figure 7 In (a), it is a curve diagram of the film thickness change of the first color light-emitting pixel unit 21-R in the second direction Y, Figure 7 In (b), it is another curve diagram of the film thickness change of the first color light-emitting pixel unit 21-R in the second direction Y.

[0088] According to Figure 5 and Figure 8 It can be known that the maximum film height difference of the second color light-emitting pixel unit 21-G in the second direction Y is less than 60 nanometers, that is, the maximum film height difference of the second color light-emitting pixel unit 21-G in the profile line E is less than 60 nanometers; wherein, Figure 8 In (a), it is a curve diagram of the film thickness change of the second color light-emitting pixel unit 21-G in the second direction Y, Figure 8 In (b), it is another curve diagram of the film thickness change of the second color light-emitting pixel unit 21-G in the second direction Y.

[0089] According to Figure 5 and Figure 9 It can be known that the maximum film height difference of the third color light-emitting pixel unit 21-B in the second direction Y is less than 80 nanometers, that is, the maximum film height difference of the third color light-emitting pixel unit 21-B in the profile line E is less than 80 nanometers. Wherein, Figure 9 In (a), it is a curve diagram of the film thickness change of the third color light-emitting pixel unit 21-B in the second direction Y, Figure 7 In (b), it is another curve diagram of the film thickness change of the third color light-emitting pixel unit 21-B in the second direction Y.

[0090] According to Figure 7 , Figure 8 , Figure 9 It can be known that the maximum film height difference of the first color light-emitting pixel unit 21-R is less than the maximum film height difference of the second color light-emitting pixel unit 21-G, and the maximum film height difference of the second color light-emitting pixel unit 21-G is less than the maximum film height difference of the third color light-emitting pixel unit 21-B.

[0091] According to Figure 5 And Figure 10 It can be known that the maximum film forming height difference of the virtual pixel unit 22 in the second direction Y is greater than 400 nanometers, that is, the maximum film forming height difference of the virtual pixel unit 22 in the profile line F is greater than 400 nanometers; wherein, Figure 10 In (a), the curve diagram of the film layer thickness change of the virtual pixel unit 22 close to the display area AA in the second direction Y is shown. Figure 5 In (a), the curve diagram of the film layer thickness change of the virtual pixel unit 22 close to the display area AA in the second direction Y is shown. Figure 10 In (b), the curve diagram of the film layer thickness change of the virtual pixel unit 22 far from the display area AA in the second direction Y is shown. Figure 5 In (b), the curve diagram of the film layer thickness change of the virtual pixel unit 22 far from the display area AA in the second direction Y is shown.

[0092] According to Figure 7 , Figure 8 , Figure 9 , Figure 10 It can be known that the maximum film forming height difference of the virtual pixel unit 22 is greater than the maximum film forming height difference of the light emitting pixel unit 21, specifically, the maximum film forming height difference of the virtual pixel unit 22 is greater than the maximum film forming height difference of the first color light emitting pixel unit 21-R, and greater than the maximum film forming height difference of the second color light emitting pixel unit 21-G, and greater than the maximum film forming height difference of the third color light emitting pixel unit 21-B. The maximum film forming height difference of the virtual pixel unit 22 is 2 times or more than the maximum film forming height difference of the light emitting pixel unit 21.

[0093] Based on the same inventive concept, the embodiments of the present application also provide 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.

[0094] According to the above embodiments, it can be known that:

[0095] The display panel and the display device provided by the application, 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, 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 greater than the maximum film forming height difference of the light emitting pixel unit, so that 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, and then improve the uniformity of film forming of the light emitting pixel unit in the display area.

[0096] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0097] The above describes the embodiments of the application in detail, and the principle and implementation mode of the application are described by applying specific examples; the above embodiment is only used to help understand the technical scheme and core idea of the application; those skilled in the art should understand that the technical scheme recorded in the above 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 scheme deviate from the scope of the technical scheme of the embodiments of the application.

Claims

1. A display panel, characterized in that, The display panel includes a display area and a non-display area located on at least one side of the display area, and further includes: substrate; A light-emitting material layer is disposed on the substrate, the light-emitting material layer including 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 larger than the area of ​​the light-emitting pixel unit, the maximum film-forming height difference of the virtual pixel unit is greater than the maximum film-forming height difference of the light-emitting pixel unit, and the maximum film-forming height difference of the virtual pixel unit is twice or more than the maximum film-forming height difference of the light-emitting pixel unit.

2. The display panel according to claim 1, characterized in that, The area of ​​a single virtual pixel unit is three times or more the area of ​​a single luminous pixel unit.

3. The display panel according to claim 1, characterized in that, The maximum film height difference of the virtual pixel unit is greater than 400 nanometers, and the maximum film height difference of the light-emitting pixel unit is less than 80 nanometers.

4. The display panel according to claim 3, characterized in that, The plurality of light-emitting pixel units include a first color light-emitting pixel unit, a second color light-emitting pixel unit, and a third color light-emitting pixel unit. The maximum film-forming height difference of the first color light-emitting pixel unit is less than the maximum film-forming height difference of the second 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. Wherein, the first color emitting pixel unit is a red emitting pixel unit, the second color emitting pixel unit is a green emitting pixel unit, and the third color emitting pixel unit is a blue emitting pixel unit.

5. The display panel according to claim 4, characterized in that, The maximum film-forming height difference of the first color emitting pixel unit is less than 50 nanometers, the maximum film-forming height difference of the second color emitting pixel unit is less than 60 nanometers, and the maximum film-forming height difference of the third color emitting pixel unit is less than 80 nanometers.

6. The display panel according to claim 1, characterized in that, The non-display area includes a first sub-area and a second sub-area that are arranged opposite to each other. The display area is adjacent to the first sub-area and the second sub-area. The virtual pixel unit is provided in both the first sub-area and the second sub-area. The virtual pixel unit in the first sub-area is centrally symmetrical with the virtual pixel unit in the second sub-area.

7. The display panel according to claim 6, characterized in that, A plurality of light-emitting pixel units are arranged in a row of light-emitting pixels in a first direction, and a plurality of light-emitting pixel units are arranged in a column of light-emitting pixels in a second direction. The first direction and the second direction intersect. The length of the light-emitting pixel unit in the first direction is greater than its length in the second direction. In the second direction, the row of light-emitting pixels is located between the first sub-region and the second sub-region.

8. The display panel according to claim 7, characterized in that, The non-display area further includes a third sub-area and a fourth sub-area that are arranged opposite to each other. The third sub-area and the fourth sub-area are both located between the first sub-area and the second sub-area. The virtual pixel units are arranged in both the third sub-area and the fourth sub-area. The virtual pixel units in the third sub-area and the fourth sub-area are centrally symmetrical. The virtual pixel units in the first sub-area, the third sub-area, the second sub-area, and the fourth sub-area surround the display area.

9. The display panel according to claim 8, characterized in that, The virtual pixel units in the first sub-region, the third sub-region, the second sub-region, and the fourth sub-region are connected end to end in sequence.

10. The display panel according to claim 8, characterized in that, The length of the virtual pixel unit in the first sub-region in the first direction is greater than its 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 its length in the second direction; The maximum film-forming height difference of the virtual pixel units in the first sub-region in the second direction is greater than the maximum film-forming height difference of the light-emitting pixel units in the second direction; The maximum film-forming height difference of the virtual pixel units in the third sub-region in the first direction is greater than the maximum film-forming height difference of the light-emitting pixel units in the second direction.

11. The display panel according to claim 10, characterized in that, Both the first sub-region and the third sub-region are 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 in a virtual pixel column in the second direction.

12. The display panel according to claim 10, characterized in that, Both the first sub-region and the third sub-region are provided with a plurality of virtual pixel units. In the first sub-region, the plurality of virtual pixel units include a first type of virtual pixel unit and a second type of virtual pixel unit arranged in the first direction. The second type of virtual pixel unit is 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 of virtual pixel units arranged in the second direction. In the second direction, the width of the third type of virtual pixel unit is smaller than the width of the first type of virtual pixel unit and smaller than the width of the second type of virtual pixel unit, and the width of the second type of virtual pixel unit is greater than the width of the first type of virtual pixel unit; The maximum film-forming height difference of the third type of virtual pixel unit is less than the maximum film-forming height difference of the first type of virtual pixel unit, and the maximum film-forming height difference of the third type of virtual pixel unit is less than the maximum film-forming height difference of the second type of virtual pixel unit.

13. The display panel according to any one of claims 1 to 12, characterized in that, The display panel also includes: The first dam is disposed on the substrate and located in the display area; The second dam is disposed on the substrate and spans the first dam, forming a first opening with the first dam. The light-emitting pixel units are located inside the first opening and are disposed in a one-to-one correspondence with 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. The virtual pixel unit is located in the second opening and is set in a one-to-one correspondence with the second opening.

14. The display panel according to claim 13, characterized in that, 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.

15. The display panel according to claim 13, characterized in that, The display panel also includes: A first electrode layer is disposed 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 units are disposed in a one-to-one correspondence with the first electrodes, and the virtual pixel units are disposed in a one-to-one correspondence with the virtual electrodes. The 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 is electrically connected to the first electrode. The second transistor is disposed corresponding to the virtual electrode and is electrically isolated from the second transistor.

16. A display device, characterized in that, Includes the display panel as claimed in any one of claims 1 to 15.

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