Display panel and display device

Abstract

The embodiment of the invention provides a display panel and a display device, and relates to the technical field of display. The display panel comprises an array substrate, an isolation structure, light-emitting devices, a functional layer and a packaging layer, the light-emitting devices, the functional layer and the packaging layer form a microcavity, the isolation structure isolates different light-emitting devices, and the structures of the microcavities corresponding to the light-emitting devices with different colors can be designed differently. Compared with the prior art in which light-emitting devices of different colors adopt the same device structure, the light-emitting performance of the light-emitting devices of different colors can be improved.

Description

Technical Field

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

[0002] Organic Light Emitting Device (OLED for short) is considered as the next-generation flat panel display technology after liquid crystal. It has many unique advantages such as self-luminescence, all-solid state, light weight, and flexibility. The OLED display panel forms a display image by controlling the light emission of different color light-emitting devices. Since the light-emitting performances of different color light-emitting devices are different, how to make different color light-emitting devices all meet better light-emitting performance requirements is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0003] In order to overcome the technical problems mentioned in the above technical background, the present application provides a display device and a display panel.

[0004] In a first aspect of the present application, a display panel is provided, and the display panel includes:

[0005] An array substrate;

[0006] An isolation structure, which is located on the array substrate and encloses an isolation opening;

[0007] A light-emitting device, which is located on the array substrate and within the isolation opening;

[0008] A functional layer, which is located on a side of the light-emitting device away from the array substrate;

[0009] A packaging layer, which at least covers the functional layer;

[0010] The light-emitting device, the functional layer, and the packaging layer form a microcavity, and the lengths of the microcavities corresponding to different color light-emitting devices are different.

[0011] In a possible implementation manner of the present application, the length of the microcavity corresponding to the light-emitting device is positively correlated with the wavelength of the light generated by the light-emitting device;

[0012] Preferably, the length of the microcavity corresponding to the light-emitting device is equal to the wavelength of the light generated by the light-emitting device.

[0013] In a possible implementation manner of the present application, in a direction away from the array substrate, the light-emitting device includes a first electrode, a light-emitting device layer, and a second electrode stacked in sequence;

[0014] The light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device;

[0015] In a direction perpendicular to the array substrate, the thickness of the second electrode of the third light-emitting device, the thickness of the second electrode of the first light-emitting device, and the thickness of the second electrode of the second light-emitting device decrease in sequence.

[0016] Preferably, the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, and the third light-emitting device is a blue light-emitting device. In a direction perpendicular to the array substrate, the thickness of the second electrode of the blue light-emitting device, the thickness of the second electrode of the red light-emitting device, and the thickness of the second electrode of the green light-emitting device decrease in sequence.

[0017] In a possible implementation manner of the present application, in a direction perpendicular to the array substrate, the thicknesses of the corresponding functional layers of the light-emitting devices of different colors are different.

[0018] In a possible implementation manner of the present application, in a direction perpendicular to the array substrate, the thickness of the functional layer on the third light-emitting device, the thickness of the functional layer on the second light-emitting device, and the thickness of the functional layer on the first light-emitting device increase in sequence;

[0019] Preferably, in a direction perpendicular to the array substrate, the thickness of the functional layer on the blue light-emitting device, the thickness of the functional layer on the green light-emitting device, and the thickness of the functional layer on the red light-emitting device increase in sequence.

[0020] In a possible implementation manner of the present application, along a direction perpendicular to the array substrate, the light-emitting device includes at least two stacked light-emitting layers;

[0021] Preferably, in a direction away from the array substrate, the light-emitting device layer includes a hole injection layer, a first hole transport layer, a first electron blocking layer, a first light-emitting layer, a first hole blocking layer, a first electron transport layer, an N-type charge generation layer, a P-type charge generation layer, a second hole transport layer, a second electron blocking layer, a second light-emitting layer, a second hole blocking layer, a second electron transport layer, and an electron injection layer stacked in sequence;

[0022] Preferably, in a direction perpendicular to the array substrate, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the first light-emitting device is a first thickness, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the second light-emitting device is a second thickness, and the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the third light-emitting device is a third thickness, where the first thickness, the second thickness, and the third thickness are not equal;

[0023] Preferably, the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, and the third light-emitting device is a blue light-emitting device.

[0024] In a possible implementation manner of the present application, the first thickness, the second thickness, and the third thickness decrease in sequence.

[0025] In a possible implementation manner of the present application, in a direction perpendicular to the array substrate, the thickness of the second electron blocking layer in the red light-emitting device, the thickness of the second electron blocking layer in the green light-emitting device, and the thickness of the second electron blocking layer in the blue light-emitting device decrease in sequence.

[0026] In a possible implementation manner of the present application, in a direction away from the array substrate, the light-emitting device includes a first electrode, a light-emitting device layer, and a second electrode stacked in sequence; in the light-emitting device, in a direction perpendicular to the array substrate, the distance between the first light-emitting layer and the first electrode is not less than a distance D, and the calculation formula for the distance D is:

[0027] D = 0.33*(λ / n) - 54

[0028] Wherein, λ is the resonance wavelength of the microcavity formed by the light-emitting device, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

[0029] In a possible implementation manner of the present application, the display panel further includes a pixel defining layer;

[0030] The pixel defining layer is located on one side of the array substrate, and the isolation structure is located on a side of the pixel defining layer away from the array substrate;

[0031] The pixel defining layer includes a pixel opening, wherein the orthographic projection of the pixel opening on the array substrate covers the orthographic projection of the light-emitting device on the array substrate, and the orthographic projection of the isolation opening on the array substrate covers the orthographic projection of the pixel opening on the array substrate;

[0032] Preferably, the second electrode extends from the pixel opening to the edge of the isolation opening and is electrically connected to the isolation structure.

[0033] In a possible implementation manner of the present application, the isolation structure includes an isolation portion and a blocking portion stacked, the blocking portion is located on a side of the isolation portion away from the array substrate, and the orthographic projection of the isolation portion on the array substrate is located within the orthographic projection of the blocking portion on the array substrate;

[0034] Preferably, in the direction towards the isolation opening, the blocking portion protrudes relative to the isolation portion;

[0035] Preferably, the second electrode extends from the pixel opening towards the edge of the isolation opening and overlaps with the isolation portion.

[0036] In a possible implementation manner of the present application, the isolation structure further includes an isolation substrate, the isolation portion is located on a side of the isolation substrate away from the array substrate, and a positive projection of the isolation portion on the array substrate is located within a positive projection of the isolation substrate on the array substrate;

[0037] Preferably, the second electrode extends from the pixel opening towards the edge of the isolation opening and overlaps with the isolation substrate.

[0038] In a possible implementation manner of the present application, the encapsulation layer includes a first encapsulation layer;

[0039] The first encapsulation layer includes a plurality of encapsulation units, each encapsulation unit is used to encapsulate a light-emitting device in a corresponding isolation opening, and adjacent two of the encapsulation units are spaced apart and disconnected at the isolation structure.

[0040] In a possible implementation manner of the present application, the encapsulation layer further includes a second encapsulation layer, the second encapsulation layer is located on a side of the first encapsulation layer away from the array substrate, and the second encapsulation layer at least covers the first encapsulation layer;

[0041] Preferably, the encapsulation layer further includes a third encapsulation layer, the third encapsulation layer is located on a side of the second encapsulation layer away from the array substrate;

[0042] Preferably, the first encapsulation layer and the third encapsulation layer are inorganic encapsulation layers, and the second encapsulation layer is an organic encapsulation layer.

[0043] Second aspect, this embodiment further provides a display panel, the display panel includes:

[0044] An array substrate;

[0045] A light-emitting device, the light-emitting device is located on one side of the array substrate, wherein, along a direction perpendicular to the array substrate, the light-emitting device includes at least two stacked light-emitting layers;

[0046] A functional layer, the functional layer is located on a side of the light-emitting device away from the array substrate;

[0047] An encapsulation layer, the encapsulation layer at least covers the functional layer;

[0048] The light-emitting device, the functional layer, and the encapsulation layer form a microcavity. The lengths of the microcavities corresponding to light-emitting devices of different colors are different. Among them, in the direction perpendicular to the array substrate, the thicknesses of the functional layers corresponding to the light-emitting devices of different colors are different.

[0049] In a possible implementation manner of the present application, the length of the microcavity corresponding to the light-emitting device is positively correlated with the wavelength of the light generated by the light-emitting device;

[0050] Preferably, the length of the microcavity corresponding to the light-emitting device is equal to the wavelength of the light generated by the light-emitting device;

[0051] Preferably, in the direction away from the array substrate, the light-emitting device includes a first electrode, a light-emitting device layer, and a second electrode stacked in sequence;

[0052] Preferably, the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device.

[0053] In a possible implementation manner of the present application, in the direction away from the array substrate, the light-emitting device layer includes a hole injection layer, a first hole transport layer, a first electron blocking layer, a first light-emitting layer, a first hole blocking layer, a first electron transport layer, an N-type charge generation layer, a P-type charge generation layer, a second hole transport layer, a second electron blocking layer, a second light-emitting layer, a second hole blocking layer, a second electron transport layer, and an electron injection layer stacked in sequence;

[0054] Preferably, in the direction perpendicular to the array substrate, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the first light-emitting device is a first thickness, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the second light-emitting device is a second thickness, and the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the third light-emitting device is a third thickness. Among them, the first thickness, the second thickness, and the third thickness are not equal;

[0055] Preferably, the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, the third light-emitting device is a blue light-emitting device, and the first thickness, the second thickness, and the third thickness decrease in sequence;

[0056] Preferably, in the direction perpendicular to the array substrate, the thicknesses of the second electron blocking layer in the red light-emitting device, the second electron blocking layer in the green light-emitting device, and the second electron blocking layer in the blue light-emitting device decrease in sequence.

[0057] In a possible implementation manner of the present application, in the light-emitting device, in a direction perpendicular to the array substrate, the distance between the first light-emitting layer and the first electrode is not less than a distance D, and the calculation formula for the distance D is:

[0058] D = 0.33 * (λ / n) - 54

[0059] where λ is the resonance wavelength of the microcavity formed by the light-emitting device, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

[0060] In a possible implementation manner of the present application, in a direction perpendicular to the array substrate, the thickness of the second electrode of the third light-emitting device, the thickness of the second electrode of the first light-emitting device, and the thickness of the second electrode of the second light-emitting device decrease in sequence;

[0061] In a direction perpendicular to the array substrate, the thickness of the second electrode of the blue light-emitting device, the thickness of the second electrode of the red light-emitting device, and the thickness of the second electrode of the green light-emitting device decrease in sequence;

[0062] Preferably, in a direction perpendicular to the array substrate, the thickness of the functional layer on the third light-emitting device, the thickness of the functional layer on the second light-emitting device, and the thickness of the functional layer on the first light-emitting device increase in sequence;

[0063] Preferably, in a direction perpendicular to the array substrate, the thickness of the functional layer on the blue light-emitting device, the thickness of the functional layer on the green light-emitting device, and the thickness of the functional layer on the red light-emitting device increase in sequence.

[0064] In a third aspect, the present embodiment further provides a display device, and the display device includes a display panel in any one of the possible implementation manners in the first aspect or the second aspect.

[0065] The embodiments of the present application provide a display panel and a display device. The display panel includes an array substrate, an isolation structure, a light-emitting device, a functional layer, and a packaging layer. The light-emitting device, the functional layer, and the packaging layer form a microcavity. The isolation structure separates different light-emitting devices, and the structures of the microcavities corresponding to different color light-emitting devices can be designed differently. In this way, the light-emitting performance of different color light-emitting devices can be improved. Description of the Drawings

[0066] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0067] Figure 1 Schematically shows one of the cross-sectional structures of the pixel panel provided by this embodiment;

[0068] Figure 2 Schematically shows Figure 1 the schematic diagram of the positional relationship between the light-emitting device and the isolation structure in

[0069] Figure 3 Schematically shows another cross-sectional structure of the pixel panel provided by this embodiment;

[0070] Figure 4 Schematically shows a third cross-sectional structure of the pixel panel provided by this embodiment;

[0071] Figure 5 Schematically shows a fourth cross-sectional structure of the pixel panel provided by this embodiment;

[0072] Figure 6 Schematically shows a fifth cross-sectional structure of the pixel panel provided by this embodiment;

[0073] Figure 7 Schematically shows a sixth cross-sectional structure of the pixel panel provided by this embodiment;

[0074] Figure 8 Schematically shows one of the comparison tables of test data between the solution of this application and related solutions;

[0075] Figure 9 Schematically shows one of the film layer structures of the light-emitting device provided by this embodiment;

[0076] Figure 10 Schematically shows the film layer structure of the blue light-emitting device provided by this embodiment;

[0077] Figure 11 Schematically shows the test curve of improving the luminous efficiency of the blue light-emitting device by adjusting the thickness of HTL1 or HTL2;

[0078] Figure 12 Schematically shows the film layer structure of the red light-emitting device provided by this embodiment;

[0079] Figure 13 Schematically shows the test curve of improving the luminous efficiency of the red light-emitting device by adjusting the thickness of EBL1 or EBL2;

[0080] Figure 14 Schematically shows the film layer structure of the green light-emitting device provided by this embodiment;

[0081] Figure 15 Schematically shows the test curve of improving the luminous efficiency of the green light-emitting device by adjusting the thickness of EBL1 or EBL2;

[0082] Figure 16 Illustrates the second comparison table of test data of the solution of the present application and related solutions;

[0083] Figure 17 Illustrates the seventh cross-sectional structure schematic diagram of the pixel panel provided in this embodiment;

[0084] Figure 18 Illustrates the eighth cross-sectional structure schematic diagram of the pixel panel provided in this embodiment.

[0085] Icon: 1 - Display panel; 11 - Array substrate; 12 - Isolation structure; 121 - Isolation opening; 122 - Isolation substrate; 123 - Isolation part; 124 - Blocking part; 13 - Light-emitting device; 131 - First electrode; 132 - Light-emitting device layer; 133 - Second electrode; 14 - Functional layer; 15 - Encapsulation layer; 151 - First encapsulation layer; 152 - Second encapsulation layer; 153 - Third encapsulation layer; 17 - Pixel defining layer; 171 - Pixel opening. Detailed implementation manners

[0086] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0087] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0088] In some display panels, in order to reduce the difficulty of the evaporation process of the light-emitting material, an isolation structure is provided on the pixel defining layer between the pixel openings. When the light-emitting device layer and the cathode layer are evaporated in a whole layer, the light-emitting device layer and the cathode layer between adjacent pixel openings can be disconnected at the position of the isolation structure, and corresponding light-emitting device film layers can be formed in the pixel openings corresponding to different color light-emitting devices through multiple evaporation and multiple etching processes.

[0089] Patent PCT / CN2023 / 134518, Patent 202310759370.2, Patent 202310740412.8, Patent 202310707209.0, and Patent 202311346196.5 disclose related technical solutions of the isolation structure for reference.

[0090] In the related art, the device structures of different color light-emitting devices are generally the same. The same device structure means that the thicknesses of the corresponding film layers constituting different color light-emitting devices are the same, and the overall device sizes of different color light-emitting devices are the same. Due to the different light-emitting materials and light-emitting efficiencies of different color light-emitting devices, it is difficult to achieve the best light-emitting performance for different color light-emitting devices through the same device structure.

[0091] To solve the above problems, the inventors have innovatively designed the following technical solutions. The specific implementation solutions of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the defects existing in the above prior art solutions are all the results obtained by the inventors through practice and careful research. Therefore, the discovery process of the above technical problems and the solutions proposed by the present embodiment for the above problems should be the contributions made by the inventors to the present application during the invention creation process, rather than being understood as the technical content known to those skilled in the art.

[0092] Please refer to Figure 1 and Figure 2 , Figure 1 the schematic structural diagram of the display panel provided in this embodiment. Figure 2 Example Figure 1 The schematic diagram of the positional relationship between the light-emitting device and the isolation structure in. In this embodiment, the display panel 1 includes an array substrate 11, an isolation structure 12, a light-emitting device 13, a functional layer 14, and a packaging layer 15. The isolation structure 12 is located on one side of the array substrate 11 and encloses an isolation opening 121 on the array substrate 11. The light-emitting device 13 is located within the isolation opening 121, that is, the orthographic projection of the light-emitting device 13 on the array substrate 11 is located within the orthographic projection of the isolation opening 121 on the array substrate 11. One light-emitting device 13 can be provided in each isolation opening 121.

[0093] The functional layer 14 is located on the side of the light-emitting device 13 away from the array substrate 11. The functional layer 14 can be a transparent layer with a high refractive index, and the functional layer 14 is used to reduce the light loss caused by reflection during light emission. The encapsulation layer 15 covers at least the functional layer 14. Exemplarily, the encapsulation layer 15 can also cover the isolation structure 12. The side of the encapsulation layer 15 away from the array substrate 11 is a flat surface, so that subsequent film layers can be formed on the side of the encapsulation layer 15 away from the array substrate 11. In this embodiment, the light-emitting device 13, the functional layer 14, and the encapsulation layer 15 form a microcavity 20. In the direction perpendicular to the array substrate 11, the length of the microcavity 20 is the sum of the thicknesses of the three layers of the light-emitting device 13, the functional layer 14, and the encapsulation layer 15.

[0094] In this embodiment, the lengths of the microcavities 20 corresponding to light-emitting devices of different colors are different.

[0095] In the above structure, the light-emitting device 13, the functional layer 14, and the encapsulation layer 15 form a microcavity 20. The isolation structure 12 separates different light-emitting devices 13, and the structures of the microcavities 20 corresponding to light-emitting devices 13 of different colors can be designed differently. Specifically, the lengths of the microcavities 20 corresponding to light-emitting devices 13 of different colors are different. Compared with the method in the related art where light-emitting devices 13 of different colors adopt the same device structure, the light-emitting performance of light-emitting devices 13 of different colors can be improved.

[0096] In the direction perpendicular to the array substrate 11, the thicknesses of the functional layers 14 corresponding to light-emitting devices of different colors are different. The functional layer 14 can be a single-film layer structure or a multi-film layer structure (such as a double-film layer structure), and the refractive indices of the film layers constituting the functional layer 14 can be selected according to actual requirements. In this embodiment, the length of the microcavity 20 corresponding to the sub-pixel device light-emitting device 13 of different colors can be adjusted by adjusting the thickness of the functional layer 14. Compared with the method in the related art where light-emitting devices 13 of different colors adopt the same device structure, the light-emitting performance of light-emitting devices 13 of different colors can be improved.

[0097] Please refer to Figure 3 , in the direction away from the array substrate 11, the light-emitting device 13 includes a first electrode 131, a light-emitting device layer 132, and a second electrode layer 133 stacked in sequence. The display panel 10 further includes a pixel defining layer 17. The pixel defining layer 17 is located on one side of the array substrate 11, and the isolation structure 12 is located on the side of the pixel defining layer 17 away from the array substrate 11. The pixel defining layer 17 includes a pixel opening 171, and the pixel opening 171 communicates with the isolation opening 121. Exemplarily, the orthographic projection of the pixel opening 171 on the array substrate 11 covers the orthographic projection of the light-emitting device 13 on the array substrate 11, and the orthographic projection of the isolation opening 171 on the array substrate 11 covers the orthographic projection of the pixel opening 171 on the array substrate 11.

[0098] The first electrodes 131 are distributed at intervals on one side of the array substrate 11. Exemplarily, the first electrodes 131 are at least distributed at the positions of the array substrate 11 corresponding to the isolation openings 121, and the pixel openings 171 expose the first electrodes 131. The light-emitting device layer 132 extends from the pixel openings 171 to the side of the pixel defining layer 17 away from the array substrate 11. The second electrodes 133 extend from the pixel openings 171 to the edges of the isolation openings 121 and are connected to the isolation structures 12 around the isolation openings 121. In this embodiment, the first electrodes 131 can be the anodes of the light-emitting devices 13, and the second electrodes 133 can be the cathodes of the light-emitting devices 13. Further, the length of the microcavity 20 is the distance between the side of the first electrode 131 away from the array substrate 11 and the side of the encapsulation layer 15 away from the array substrate 11.

[0099] Please refer to Figure 4 , the isolation structure 12 includes a stacked isolation portion 123 and a blocking portion 124. Among them, the blocking portion 124 is located on the side of the isolation portion 123 away from the array substrate 11. The orthographic projection of the isolation portion 123 on the array substrate 11 is located within the orthographic projection of the blocking portion 124 on the array substrate 11. In the direction towards the isolation opening 121, the blocking portion 124 protrudes relative to the isolation portion 123. The second electrode 133 extends from the pixel opening 171 to the edge of the isolation opening 121 and overlaps with the isolation portion 123.

[0100] Please refer to Figure 5 , in this embodiment, the isolation structure 12 may further include an isolation substrate 122. The isolation substrate 122, the isolation portion 123, and the blocking portion 124 are stacked in sequence. The orthographic projection of the isolation portion 123 on the array substrate 11 is located within the orthographic projection of the isolation substrate 122 on the array substrate 11. The orthographic projection of the isolation substrate 122 on the array substrate 11 is located within the orthographic projection of the blocking portion 124 on the array substrate 11. That is, in the direction towards the isolation opening 121, the isolation substrate 122 and the blocking portion 124 respectively protrude relative to the isolation portion 123. Exemplarily, the second electrode 133 extends from the pixel opening 171 to the edge of the isolation opening 121 and overlaps with the isolation substrate 122.

[0101] Please refer to Figure 6 , the encapsulation layer 15 includes a first encapsulation layer 151. The first encapsulation layer 151 includes a plurality of encapsulation units 1511. Adjacent encapsulation units 1511 are arranged at intervals at the isolation structure 12. Among them, the material of the encapsulation unit 1511 is an inorganic material, and the encapsulation unit 1511 can be fabricated by chemical vapor deposition. Each encapsulation unit 1511 is used to independently encapsulate the light-emitting device 13 in one isolation opening 121. Please refer to Figure 7, the encapsulation layer 15 further includes a second encapsulation layer 152 and a third encapsulation layer 153. The second encapsulation layer 152 covers the isolation structure 12 and the light-emitting device 13, and a flat surface is formed on the side of the second encapsulation layer 152 away from the array substrate 11. The third encapsulation layer 153 is located on the side of the second encapsulation layer 152 away from the array substrate 11. Among them, the second encapsulation layer 152 can be fabricated by an inkjet printing method, and the third encapsulation layer 153 can be fabricated by a chemical vapor deposition method. The first encapsulation layer 151 and the third encapsulation layer 153 are inorganic encapsulation layers, and the second encapsulation layer 152 is an organic encapsulation layer. The first encapsulation layer 151, the second encapsulation layer 152, and the third encapsulation layer 153 form a thin-film encapsulation structure of the display panel 10.

[0102] In order to improve the light extraction efficiency of the light-emitting device 13 and reduce the device power consumption, microcavity resonance (the reflected light interferes constructively in the microcavity) can be utilized to improve the light extraction efficiency, where the first electrode serves as a total reflection electrode of the microcavity 20, and the second electrode serves as a semi-reflection electrode of the microcavity 20. In this embodiment, microcavity resonance can be achieved by adjusting the length of the microcavity 20 corresponding to the light-emitting device 13. Among them, the length of the microcavity 20 corresponding to the light-emitting device 13 is positively correlated with the wavelength of the light generated by the light-emitting device 13, that is, the longer the wavelength of the light generated by the light-emitting device 13, the longer the length of the corresponding microcavity 20.

[0103] Exemplarily, the length L of the microcavity 20 can be calculated by the following formula:

[0104]

[0105] where n i is the refractive index of the i-th layer film in the microcavity, d i is the thickness of the i-th layer film in the microcavity, ψ1 and ψ2 are the reflection phase shifts of the total reflection electrode and the semi-reflection electrode in the microcavity respectively, m is the order of the microcavity, λ is the resonance wavelength of the microcavity, and m is a positive integer.

[0106] In this embodiment, the value of m can be 2, L = λ, that is, the length L of the microcavity 20 is equal to the resonance wavelength of the second-order microcavity. When the resonance wavelength of the second-order microcavity is equal to the wavelength of the light generated by the light-emitting device 13, the reflected light can interfere constructively completely in the microcavity 20, thereby improving the light extraction efficiency and reducing the device power consumption.

[0107] The light-emitting device 13 includes a first light-emitting device, a second light-emitting device, and a third light-emitting device. Among them, the first light-emitting device, the second light-emitting device, and the third light-emitting device are used to generate lights of different colors respectively. The wavelengths of the lights generated by the first light-emitting device, the second light-emitting device, and the third light-emitting device decrease in sequence. Exemplarily, the first light-emitting device, the second light-emitting device, and the third light-emitting device can correspond to a red light-emitting device R, a green light-emitting device G, and a blue light-emitting device B respectively. The red light-emitting device R, the green light-emitting device G, and the blue light-emitting device B form a light-emitting pixel. By changing the light-emitting brightness of the red light-emitting device R, the green light-emitting device G, and the blue light-emitting device B, the color and brightness of the light-emitting pixel can be adjusted. Hereinafter, an example will be given in which the first light-emitting device, the second light-emitting device, and the third light-emitting device can correspond to a red light-emitting device R, a green light-emitting device G, and a blue light-emitting device B respectively.

[0108] The enhancement effect of the microcavity 20 on the light output of the light-emitting device 13 can be measured by the full width at half maximum FWHM. The calculation formula of the full width at half maximum FWHM is as follows.

[0109]

[0110] Among them, R1 and R2 are the reflectivities of the total reflection electrode and the semi-reflection electrode respectively. The smaller the full width at half maximum FWHM, the greater the enhancement degree of the microcavity 20 on the light output of the light-emitting device 13, and at the same time, the narrower the wavelength range of the light output.

[0111] Since the light-emitting efficiency of the blue light-emitting device B (the third light-emitting device) is not high, the thickness of the second electrode 133 of the blue light-emitting device B can be increased, which can reduce the full width at half maximum FWHM of the microcavity corresponding to the blue light-emitting device B and increase the light output efficiency of the blue light-emitting device. And the proportion of the green light generated by the green light-emitting device G (the second light-emitting device) is the largest when synthesizing white light. In order to avoid affecting the brightness attenuation of the white light, the wavelength range of the green light output needs to be as wide as possible, and the full width at half maximum FWHM of the microcavity corresponding to the green light-emitting device G needs to be as large as possible, that is, the thickness of the second electrode 133 of the green light-emitting device G cannot be too thick. Therefore, in this embodiment, the thicknesses of the second electrodes 133 of the blue light-emitting device B, the red light-emitting device R (the first light-emitting device), and the green light-emitting device G decrease in sequence.

[0112] Further, in order to match the length of the microcavity 20 corresponding to the light-emitting device 13 of each color with the wavelength of the light generated by the light-emitting device 13, it can be achieved by adjusting the thickness of the functional layer 14 on the light-emitting device 13 of each color. Specifically, the wavelength of the light generated by the red light-emitting device R is the longest, and the thickness of the functional layer 14 on the red light-emitting device R is the thickest; the wavelength of the light generated by the green light-emitting device G is the second longest, and the thickness of the functional layer 14 on the green light-emitting device G is the second thickest; the wavelength of the light generated by the blue light-emitting device B is the shortest, and the thickness of the functional layer 14 on the blue light-emitting device B is the thinnest. That is, in this embodiment, the thickness of the functional layer 14 on the blue light-emitting device B, the thickness of the functional layer 14 on the green light-emitting device G, and the thickness of the functional layer 14 on the red light-emitting device R increase in sequence.

[0113] Please refer to Figure 8 , Figure 8 which exemplifies a comparison table of the solutions of the present application and related solutions. In the related solutions, the light-emitting devices of different colors have the same device structure. Compared with the related solutions, the power consumption of the solution of the present application is reduced by 31.5%, and the color difference (JNCD) under different viewing angles is also lower than that of the related solutions. Exemplarily, when the viewing angle is 30°, the color difference of the solution of the present application is 0.8, which is 0.6 smaller than that of the related solutions; when the viewing angle is 45°, the color difference of the solution of the present application is 1.3, which is 0.9 smaller than that of the related solutions; when the viewing angle is 60°, the color difference of the solution of the present application is 1.8, which is 0.2 smaller than that of the related solutions; when the viewing angle is 75°, the color difference of the solution of the present application is 2, which is 0.8 smaller than that of the related solutions; when the viewing angle is 80°, the color difference of the solution of the present application is 2.2, which is 1.3 smaller than that of the related solutions. That is, from the above data, it can be seen that the above solution provided by the present application can reduce the power consumption of the display panel and improve the color difference under different viewing angles.

[0114] In this embodiment, the light-emitting device 13 may also be a stacked light-emitting device, that is, in the direction perpendicular to the array substrate 11, the light-emitting device 13 includes at least two stacked light-emitting layers; further, the orthographic projections of different light-emitting layers on the array substrate may coincide.

[0115] Exemplarily, the following takes the light-emitting device 13 including two light-emitting layers as an example for illustration. It can be understood that the same applies to the case of three or more light-emitting layers. Please refer to Figure 9, in the direction away from the array substrate 11, the light-emitting device layer 132 includes a hole injection layer HIL (Hole Injection Layer), a first hole transport layer HTL1 (Hole Tranport Layer), a first electron blocking layer EBL1 (Electron-Blocking Layer), a first emission layer EML1 (Emission layer), a first hole blocking layer HBL1 (Hole Block Layer), a first electron transport layer ETL1 (Electron Transport Layer), an N-type charge generation layer N-CGL (Charge-Generation Layer), a P-type charge generation layer P-CGL, a second hole transport layer HTL2, a second electron blocking layer EBL2, a second emission layer EML2, a second hole blocking layer HBL2, a second electron transport layer ETL2, and an electron injection layer EIL (Electron Injection Layer) stacked in sequence.

[0116] In this embodiment, in order to improve the light-emitting efficiency of different color stacked light-emitting devices, it can be achieved by adjusting the thicknesses of different film layers in the light-emitting device layer 132. Exemplarily, when improving the light-emitting efficiency of the blue light-emitting device B (the third light-emitting device), the thicknesses of the first hole transport layer HTL1 and the second hole transport layer HTL2 can be adjusted. Please refer to Figure 10 and Figure 11 . By comparing the two methods of fixing HTL1 and adjusting the thickness of HTL2, and fixing HTL2 and adjusting the thickness of HTL1, it can be seen that the method of fixing HTL2 and adjusting the thickness of HTL1 has a more obvious effect on improving the light-emitting efficiency of the blue light-emitting device B, and the chromaticity-light intensity curve differences of HTL1 under different thickness conditions are smaller. In this way, when there are differences in the thickness of HTL1 caused by evaporation errors, the light-emitting efficiency will not change significantly. That is, in this embodiment, the light-emitting efficiency of the blue light-emitting device B can be improved by adjusting the thickness of HTL1.

[0117] Exemplarily, when improving the light-emitting efficiency of the red light-emitting device R (the first light-emitting device), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the red light-emitting device R can be adjusted. Please refer to Figure 12 and Figure 13, when the thickness of EBL1 (RPL1) remains unchanged and the thickness of EBL2 (RPL2) is adjusted, the luminous efficiency of the red light-emitting device R will be higher, and the chromaticity-intensity curves of EBL2 (RPL2) under different thickness conditions have less difference. In this way, when there are differences in the thickness of EBL2 (RPL2) caused by evaporation errors, the luminous efficiency will not change significantly. That is, in this embodiment, the luminous efficiency of the red light-emitting device R can be improved by adjusting the thickness of EBL2 (RPL2).

[0118] Similarly, when improving the luminous efficiency of the green light-emitting device G (the second light-emitting device), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the green light-emitting device G can be adjusted. Please refer to Figure 14 and Figure 15 , when the thickness of EBL1 (GPL1) is fixed and the thickness of EBL2 (GPL2) is adjusted, the luminous efficiency of the green light-emitting device G will be higher, and the chromaticity-intensity curves of EBL2 (GPL2) under different thickness conditions have less difference. In this way, when there are differences in the thickness of EBL2 (GPL2) caused by evaporation errors, the luminous efficiency will not change significantly. That is, in this embodiment, the luminous efficiency of the green light-emitting device G can be improved by adjusting the thickness of EBL2 (GPL2).

[0119] In this embodiment, the light extraction efficiency of the three different color light-emitting devices 13 can be improved by adjusting the thickness of HTL1 in the blue light-emitting device G, the thickness of EBL2 (RPL2) in the red light-emitting device R, and the thickness of EBL2 (GPL2) in the green light-emitting device G, so as to reduce the power consumption of the light-emitting device 13.

[0120] Furthermore, in this embodiment, please refer to again Figure 10 , Figure 12 and Figure 14 , the sum of the thicknesses of the first electron blocking layer EBL1 and the second electron blocking layer EBL2 in the red light-emitting device R is the first thickness (d11 + d12), the sum of the thicknesses of the first electron blocking layer EBL1 and the second electron blocking layer EBL2 in the green light-emitting device G is the second thickness (d21 + d22), and the sum of the thicknesses of the first electron blocking layer EBL1 and the second electron blocking layer EBL2 in the blue light-emitting device B is the third thickness (d31 + d32), where the first thickness, the second thickness, and the third thickness are not equal. Exemplarily, the first thickness, the second thickness, and the third thickness decrease in sequence.

[0121] In this embodiment, in the direction perpendicular to the array substrate, the thickness d12 of the second electron blocking layer in the red light-emitting device R, the thickness d22 of the second electron blocking layer in the green light-emitting device G, and the thickness d23 of the second electron blocking layer in the blue light-emitting device B decrease in sequence.

[0122] In this embodiment, in order to improve the light extraction efficiency of the light-emitting device 13, in the light-emitting device 13, the distance between the first light-emitting layer EML1 and the first electrode 131 is not less than the distance D, and the calculation formula for the distance D is:

[0123] D = 0.33*(λ / n) - 54

[0124] where λ is the resonance wavelength of the microcavity corresponding to the light-emitting device, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

[0125] Please refer to Figure 16 , Figure 16 , which exemplifies a schematic comparison table of the luminous efficiency of the stacked light-emitting device provided in this embodiment and the stacked light-emitting device in the related art. Under the condition of substantially the same chromaticity CIEy, the light-emitting device 13 provided in this embodiment can greatly improve the maximum value of the luminous intensity BI of the first light-emitting layer EML1, so that the overall luminous efficiency of the light-emitting device 13 is improved. Exemplarily, as Figure 16 shown, in the related art, the maximum value of the luminous intensity BI of the first light-emitting layer EML1 is 83.2%, the maximum value of the luminous intensity BI of the second light-emitting layer EM2 is 100%, and the maximum value of the total luminous intensity BI of the light-emitting device 13 is 182.8%; while in this solution, the maximum value of the luminous intensity BI of the first light-emitting layer EML1 is 103.1%, the maximum value of the luminous intensity BI of the second light-emitting layer EM2 is 100%, and the maximum value of the total luminous intensity BI of the light-emitting device 13 is 203.1%. That is, compared with the related art, the luminous intensity of the first light-emitting layer EML1 of the light-emitting device 13 provided in the embodiment of the present application and the total luminous intensity of the light-emitting device 13 are both improved.

[0126] Based on the same inventive concept, the embodiment of the present application further provides a display panel. Please refer to Figure 17 , the display panel 1 includes an array substrate 11, a light-emitting device 13, a functional layer 14, and a packaging layer 15. The light-emitting device 13 is located on one side of the array substrate 11. Among them, along the direction perpendicular to the array substrate 11, the light-emitting device 13 includes at least two stacked light-emitting layers. Preferably, the orthographic projections of different light-emitting layers on the array substrate 11 coincide.

[0127] The functional layer 14 is located on the side of the light-emitting device 13 away from the array substrate 11. The functional layer 14 can be a transparent layer with a high refractive index, and the functional layer 14 is used to reduce the light loss caused by reflection during light emission. The encapsulation layer 15 covers at least the functional layer 14, and the side of the encapsulation layer 15 away from the array substrate 11 is a flat surface, so that subsequent film layers can be formed on the side of the encapsulation layer 15 away from the array substrate 11. In this embodiment, the film layers on the side of the first electrode of the light-emitting device 13 away from the array substrate 11 form a microcavity 20, that is, in the direction away from the array substrate 11, the microcavity 20 is sequentially composed of the stacked light-emitting device 13, functional layer 14, and encapsulation layer 15. In the direction perpendicular to the array substrate 11, the length of the microcavity 20 is the sum of the thicknesses of the three layers of the light-emitting device 13, functional layer 14, and encapsulation layer 15.

[0128] In this embodiment, the lengths of the microcavities 20 corresponding to light-emitting devices of different colors are different.

[0129] In the above structure, the lengths of the microcavities 20 corresponding to light-emitting devices 13 of different colors are different. Compared with the method in the related art where light-emitting devices 13 of different colors adopt the same device structure, the light-emitting performance of light-emitting devices 13 of different colors can be improved.

[0130] In the direction perpendicular to the array substrate 11, the thicknesses of the functional layers 14 corresponding to light-emitting devices of different colors are different. The functional layer 14 can be a single-film layer structure or a multi-film layer structure (such as a double-film layer structure), and the refractive indices of the film layers constituting the functional layer 14 can be selected according to actual requirements. In this embodiment, the length of the microcavity 20 corresponding to the light-emitting device 13 of different color sub-pixel devices can be adjusted by adjusting the thickness of the functional layer 14. Compared with the method in the related art where light-emitting devices 13 of different colors adopt the same device structure, the light-emitting performance of light-emitting devices 13 of different colors can be improved.

[0131] In this embodiment, in order to improve the light extraction efficiency of the light-emitting device 13 and reduce the device power consumption, microcavity resonance (the reflected light interferes constructively in the microcavity) can be used to improve the light extraction efficiency. The first electrode serves as the total reflection electrode of the microcavity 20, and the second electrode serves as the semi-reflection electrode of the microcavity 20. In this embodiment, microcavity resonance can be achieved by adjusting the length of the microcavity 20 corresponding to the light-emitting device 13. Among them, the length of the microcavity 20 corresponding to the light-emitting device 13 is positively correlated with the wavelength of the light generated by the light-emitting device 13, that is, the longer the wavelength of the light generated by the light-emitting device 13, the longer the length of the corresponding microcavity 20.

[0132] Exemplarily, the length L of the microcavity 20 can be calculated by the following formula:

[0133]

[0134] Where ni is the refractive index of the i-th layer of the film in the microcavity, d i is the thickness of the i-th layer of the film in the microcavity, ψ1 and ψ2 are the reflection phase shifts of the total reflection electrode and the semi-reflection electrode in the microcavity respectively, m is the order of the microcavity, λ is the resonance wavelength of the microcavity, where m is a positive integer.

[0135] In this embodiment, m can take the value of 2, L = λ, that is, the length L of the microcavity 20 is equal to the resonance wavelength of the second-order microcavity. When the resonance wavelength of the second-order microcavity is equal to the wavelength of the light generated by the light-emitting device 13, the reflected light can completely interfere constructively in the microcavity 20, thereby improving the light extraction efficiency and reducing the power consumption of the device.

[0136] The light-emitting device 13 includes a first light-emitting device, a second light-emitting device, and a third light-emitting device. Among them, the first light-emitting device, the second light-emitting device, and the third light-emitting device are used to generate lights of different colors respectively. The wavelengths of the lights generated by the first light-emitting device, the second light-emitting device, and the third light-emitting device decrease in sequence. Exemplarily, the first light-emitting device, the second light-emitting device, and the third light-emitting device can correspond to a red light-emitting device R, a green light-emitting device G, and a blue light-emitting device B respectively. The red light-emitting device R, the green light-emitting device G, and the blue light-emitting device B form a light-emitting pixel. By changing the light-emitting brightness of the red light-emitting device R, the green light-emitting device G, and the blue light-emitting device B, the color and brightness of the light-emitting pixel can be adjusted. The following takes the first light-emitting device, the second light-emitting device, and the third light-emitting device can correspond to a red light-emitting device R, a green light-emitting device G, and a blue light-emitting device B respectively as an example for illustration.

[0137] Please refer to Figure 18 , in the direction away from the array substrate 11, the light-emitting device 13 includes a first electrode 131, a light-emitting device layer 132, and a second electrode layer 133 stacked in sequence. The display panel 10 further includes a pixel defining layer 17. The pixel defining layer 17 is located on one side of the array substrate 11. The pixel defining layer 17 includes a pixel opening, and the light-emitting device 13 is located within the pixel opening. In this embodiment, the first electrode 131 can be the anode of the light-emitting device 13, and the second electrode 133 can be the cathode of the light-emitting device 13. The first electrode serves as the total reflection electrode of the microcavity 20, and the second electrode serves as the semi-reflection electrode of the microcavity 20. Further, the length of the microcavity 20 is the distance between the side of the first electrode 131 away from the array substrate 11 and the side of the encapsulation layer 15 away from the array substrate 11.

[0138] In this embodiment, please refer to again Figure 9, in the direction away from the array substrate 11, the light-emitting device layer 132 includes a hole injection layer HIL (Hole Injection Layer), a first hole transport layer HTL1 (Hole Tranport Layer), a first electron blocking layer EBL1 (Electron-Blocking Layer), a first emission layer EML1 (Emission layer), a first hole blocking layer HBL1 (Hole Block Layer), a first electron transport layer ETL1 (Electron Transport Layer), an N-type charge generation layer N-CGL (Charge-Generation Layer), a P-type charge generation layer P-CGL, a second hole transport layer HTL2, a second electron blocking layer EBL2, a second emission layer EML2, a second hole blocking layer HBL2, a second electron transport layer ETL2, and an electron injection layer EIL (Electron Injection Layer) stacked in sequence.

[0139] In this embodiment, in order to improve the luminous efficiency of the stacked light-emitting devices of different colors, it can be achieved by adjusting the thicknesses of different film layers in the light-emitting device layer 132. Exemplarily, when improving the luminous efficiency of the blue light-emitting device B (the third light-emitting device), the thicknesses of the first hole transport layer HTL1 and the second hole transport layer HTL2 can be adjusted. Please refer to again Figure 10 and Figure 11 . By comparing the two methods of fixing HTL1 and adjusting the thickness of HTL2, and fixing HTL2 and adjusting the thickness of HTL1, it can be seen that the method of fixing HTL2 and adjusting the thickness of HTL1 has a more obvious effect on improving the luminous efficiency of the blue light-emitting device B, and the chromaticity-intensity curves of HTL1 under different thickness conditions have a smaller difference. In this way, when there are differences in the thickness of HTL1 caused by evaporation errors, the luminous efficiency will not change significantly. That is, in this embodiment, the luminous efficiency of the blue light-emitting device B can be improved by adjusting the thickness of HTL1.

[0140] Exemplarily, when improving the luminous efficiency of the red light-emitting device R (the first light-emitting device), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the red light-emitting device R can be adjusted. Please refer to again Figure 12 and Figure 13, when the thickness of EBL1 (RPL1) remains unchanged and the thickness of EBL2 (RPL2) is adjusted, the luminous efficiency of the red light-emitting device R will be higher, and the chromaticity-luminance intensity curves of EBL2 (RPL2) under different thickness conditions have less difference. In this way, it can be avoided that when there are differences in the thickness of EBL2 (RPL2) caused by evaporation errors, there will be large changes in the luminous efficiency. That is, in this embodiment, the luminous efficiency of the red light-emitting device R can be improved by adjusting the thickness of EBL2 (RPL2).

[0141] Similarly, when improving the luminous efficiency of the green light-emitting device G (the second light-emitting device), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the green light-emitting device G can be adjusted. Please refer to again Figure 14 and Figure 15 , when the thickness of EBL1 (GPL1) is fixed and the thickness of EBL2 (GPL2) is adjusted, the luminous efficiency of the green light-emitting device G will be higher, and the chromaticity-luminance intensity curves of EBL2 (GPL2) under different thickness conditions have less difference. In this way, it can be avoided that when there are differences in the thickness of EBL2 (GPL2) caused by evaporation errors, there will be large changes in the luminous efficiency. That is, in this embodiment, the luminous efficiency of the green light-emitting device G can be improved by adjusting the thickness of EBL2 (GPL2).

[0142] In this embodiment, the light extraction efficiency of the three different color light-emitting devices 13 can be improved by adjusting the thickness of HTL1 in the blue light-emitting device G, the thickness of EBL2 (RPL2) in the red light-emitting device R, and the thickness of EBL2 (GPL2) in the green light-emitting device G, so as to reduce the power consumption of the light-emitting device 13.

[0143] Furthermore, in this embodiment, please refer to again Figure 10 , Figure 12 and Figure 14 , the sum of the thicknesses of the first electron blocking layer EBL1 and the second electron blocking layer EBL2 in the red light-emitting device R is the first thickness (d11 + d12), the sum of the thicknesses of the first electron blocking layer EBL1 and the second electron blocking layer EBL2 in the green light-emitting device G is the second thickness (d21 + d22), and the sum of the thicknesses of the first electron blocking layer EBL1 and the second electron blocking layer EBL2 in the blue light-emitting device B is the third thickness (d31 + d32), where the first thickness, the second thickness, and the third thickness are not equal. Exemplarily, the first thickness, the second thickness, and the third thickness decrease in sequence.

[0144] In this embodiment, in the direction perpendicular to the array substrate, the thickness d12 of the second electron blocking layer in the red light-emitting device R, the thickness d22 of the second electron blocking layer in the green light-emitting device G, and the thickness d23 of the second electron blocking layer in the blue light-emitting device B decrease in sequence.

[0145] In this embodiment, in order to improve the light extraction efficiency of the light-emitting device 13, in the light-emitting device 13, the distance between the first light-emitting layer EML1 and the first electrode 131 is not less than the distance D, and the calculation formula for the distance D is:

[0146] D = 0.33 * (λ / n) - 54

[0147] where λ is the resonance wavelength of the microcavity corresponding to the light-emitting device, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

[0148] In this embodiment, the enhancement effect of the microcavity 20 on the light extraction of the light-emitting device 13 can be measured by the full width at half maximum FWHM, and the calculation formula for the full width at half maximum FWHM is as follows.

[0149]

[0150] where R1 and R2 are the reflectivities of the total reflection electrode and the semi-reflection electrode respectively. The smaller the full width at half maximum FWHM, the greater the enhancement degree of the microcavity 20 on the light extraction of the light-emitting device 13, and at the same time, the narrower the wavelength range of the light extraction.

[0151] Since the luminous efficiency of the blue light-emitting device B (the third light-emitting device) is not high, the thickness of the second electrode 133 of the blue light-emitting device B can be increased, which can reduce the full width at half maximum FWHM of the microcavity corresponding to the blue light-emitting device B and increase the light extraction efficiency of the blue light-emitting device. And the proportion of the green light generated by the green light-emitting device G (the second light-emitting device) in the synthesis of white light is the largest. In order to avoid affecting the brightness attenuation of the white light, the wavelength range of the green light extraction needs to be as wide as possible, and the full width at half maximum FWHM of the microcavity corresponding to the green light-emitting device G needs to be as large as possible, that is, the thickness of the second electrode 133 of the green light-emitting device G cannot be too thick. For this reason, in this embodiment, the thickness of the second electrode 133 of the blue light-emitting device B, the thickness of the second electrode 133 of the red light-emitting device R (the first light-emitting device), and the thickness of the second electrode 133 of the green light-emitting device G decrease in sequence.

[0152] Further, in order to match the length of the microcavity 20 corresponding to the light-emitting devices 13 of each color with the wavelength of the light generated by the light-emitting devices 13, it can be achieved by adjusting the thickness of the functional layer 14 on the light-emitting devices 13 of each color. Specifically, the wavelength of the light generated by the red light-emitting device R is the longest, and the thickness of the functional layer 14 on the red light-emitting device R is the thickest; the wavelength of the light generated by the green light-emitting device G is the second longest, and the thickness of the functional layer 14 on the green light-emitting device G is the second thickest; the wavelength of the light generated by the blue light-emitting device B is the shortest, and the thickness of the functional layer 14 on the blue light-emitting device B is the thinnest. That is, in this embodiment, the thickness of the functional layer 14 on the blue light-emitting device B, the thickness of the functional layer 14 on the green light-emitting device G, and the thickness of the functional layer 14 on the red light-emitting device R increase in sequence.

[0153] Based on the same inventive concept, an embodiment of the present application further provides a display device, which includes the display panel described in the foregoing embodiments. The foregoing display panel can improve the light-emitting performance of light-emitting devices of different colors, so that under the condition of ensuring the same display brightness, the required power consumption is smaller, which is beneficial to improving the battery life of the display device.

[0154] In summary, an embodiment of the present application provides a display panel and a display device. The display panel includes an array substrate, an isolation structure, a light-emitting device, a functional layer, and a packaging layer. The light-emitting device, the functional layer, and the packaging layer form a microcavity. The isolation structure separates different light-emitting devices, and the structures of the microcavities corresponding to different color light-emitting devices can be designed differently. Compared with the manner in the related art where light-emitting devices of different colors adopt the same device structure, the light-emitting performance of light-emitting devices of different colors can be improved.

[0155] The foregoing are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that, The display panel includes: An array substrate; An isolation structure, which is located on the array substrate and encloses an isolation opening; A light-emitting device, which is located on the array substrate and within the isolation opening; A functional layer, which is located on the side of the light-emitting device away from the array substrate; A packaging layer, which at least covers the functional layer; The light-emitting device, the functional layer, and the packaging layer form a microcavity, and the lengths of the microcavities corresponding to light-emitting devices of different colors are different.

2. The display panel according to claim 1, characterized in that, The length of the microcavity corresponding to the light-emitting device is positively correlated with the wavelength of the light generated by the light-emitting device; Preferably, the length of the microcavity corresponding to the light-emitting device is equal to the wavelength of the light generated by the light-emitting device.

3. The display panel according to claim 1, wherein: In the direction away from the array substrate, the light-emitting device includes a first electrode, a light-emitting device layer, and a second electrode stacked in sequence; The light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device; In the direction perpendicular to the array substrate, the thickness of the second electrode of the third light-emitting device, the thickness of the second electrode of the first light-emitting device, and the thickness of the second electrode of the second light-emitting device decrease in sequence; Preferably, the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, and the third light-emitting device is a blue light-emitting device. In the direction perpendicular to the array substrate, the thickness of the second electrode of the blue light-emitting device, the thickness of the second electrode of the red light-emitting device, and the thickness of the second electrode of the green light-emitting device decrease in sequence.

4. The display panel according to claim 3, wherein In the direction perpendicular to the array substrate, the thicknesses of the functional layers corresponding to the light-emitting devices of different colors are different.

5. The display panel according to claim 4, wherein: In the direction perpendicular to the array substrate, the thickness of the functional layer on the third light-emitting device, the thickness of the functional layer on the second light-emitting device, and the thickness of the functional layer on the first light-emitting device increase in sequence; Preferably, in the direction perpendicular to the array substrate, the thickness of the functional layer on the blue light-emitting device, the thickness of the functional layer on the green light-emitting device, and the thickness of the functional layer on the red light-emitting device increase in sequence.

6. The display panel according to any one of claims 3-5, characterized in that, In the direction perpendicular to the array substrate, the light-emitting device includes at least two stacked light-emitting layers; Preferably, in the direction away from the array substrate, the light-emitting device layer includes a hole injection layer, a first hole transport layer, a first electron blocking layer, a first light-emitting layer, a first hole blocking layer, a first electron transport layer, an N-type charge generation layer, a P-type charge generation layer, a second hole transport layer, a second electron blocking layer, a second light-emitting layer, a second hole blocking layer, a second electron transport layer, and an electron injection layer stacked in sequence; Preferably, in a direction perpendicular to the array substrate, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the first light-emitting device is a first thickness, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the second light-emitting device is a second thickness, and the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the third light-emitting device is a third thickness, where the first thickness, the second thickness, and the third thickness are not equal; Preferably, the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, and the third light-emitting device is a blue light-emitting device.

7. The display panel according to claim 6, wherein The first thickness, the second thickness, and the third thickness decrease in sequence.

8. The display panel according to claim 6, wherein In a direction perpendicular to the array substrate, the thicknesses of the second electron blocking layer in the red light-emitting device, the thickness of the second electron blocking layer in the green light-emitting device, and the thickness of the second electron blocking layer in the blue light-emitting device decrease in sequence.

9. The display panel according to claim 5, wherein In a direction away from the array substrate, the light-emitting device includes a first electrode, a light-emitting device layer, and a second electrode stacked in sequence; In the light-emitting device, in a direction perpendicular to the array substrate, the distance between the first light-emitting layer and the first electrode is not less than a distance D, and the calculation formula for the distance D is: D = 0.33*(λ / n) - 54 where λ is the resonance wavelength of the microcavity formed by the light-emitting device, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

10. The display panel according to claim 3, characterized in that, The display panel further includes a pixel defining layer; The pixel defining layer is located on one side of the array substrate, and the isolation structure is located on the side of the pixel defining layer away from the array substrate; The pixel defining layer includes a pixel opening, where the orthographic projection of the pixel opening on the array substrate covers the orthographic projection of the light-emitting device on the array substrate, and the orthographic projection of the isolation opening on the array substrate covers the orthographic projection of the pixel opening on the array substrate; Preferably, the second electrode extends from the pixel opening to the edge of the isolation opening and is electrically connected to the isolation structure.

11. The display panel according to claim 10, wherein, The isolation structure includes a stacked isolation portion and a blocking portion, the blocking portion is located on the side of the isolation portion away from the array substrate, and the orthographic projection of the isolation portion on the array substrate is located within the orthographic projection of the blocking portion on the array substrate; Preferably, in a direction towards the isolation opening, the blocking portion protrudes relative to the isolation portion; Preferably, the second electrode extends from the pixel opening to the edge of the isolation opening and overlaps with the isolation portion.

12. The display panel according to claim 11, wherein The isolation structure further includes an isolation substrate, the isolation portion is located on the side of the isolation substrate away from the array substrate, and the orthographic projection of the isolation portion on the array substrate is located within the orthographic projection of the isolation substrate on the array substrate; Preferably, the second electrode extends from the pixel opening to the edge of the isolation opening and overlaps with the isolation substrate.

13. The display panel according to claim 10, characterized in that, The encapsulation layer includes a first encapsulation layer; The first encapsulation layer includes a plurality of encapsulation units, each encapsulation unit being configured to encapsulate a light-emitting device in a corresponding isolation opening, and two adjacent encapsulation units being spaced apart at the isolation structure.

14. The display panel according to claim 13, wherein The encapsulation layer further includes a second encapsulation layer, the second encapsulation layer being located on a side of the first encapsulation layer away from the array substrate, and the second encapsulation layer at least covering the first encapsulation layer; Preferably, the encapsulation layer further includes a third encapsulation layer, the third encapsulation layer being located on a side of the second encapsulation layer away from the array substrate; Preferably, the first encapsulation layer and the third encapsulation layer are inorganic encapsulation layers, and the second encapsulation layer is an organic encapsulation layer.

15. A display panel, characterized in that, The display panel includes: An array substrate; A light-emitting device, the light-emitting device being located on one side of the array substrate, wherein, along a direction perpendicular to the array substrate, the light-emitting device includes at least two stacked light-emitting layers; A functional layer, the functional layer being located on a side of the light-emitting device away from the array substrate; An encapsulation layer, the encapsulation layer at least covering the functional layer; The light-emitting device, the functional layer, and the encapsulation layer form a microcavity, and the microcavity lengths corresponding to light-emitting devices of different colors are different.

16. The display panel according to claim 15, wherein The length of the microcavity corresponding to the light-emitting device is positively correlated with the wavelength of the light generated by the light-emitting device; Preferably, the length of the microcavity corresponding to the light-emitting device is equal to the wavelength of the light generated by the light-emitting device; Preferably, in a direction away from the array substrate, the light-emitting device includes a first electrode, a light-emitting device layer, and a second electrode stacked in sequence; Preferably, the light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device.

17. The display panel according to claim 16, wherein In a direction away from the array substrate, the light-emitting device layer includes a hole injection layer, a first hole transport layer, a first electron blocking layer, a first light-emitting layer, a first hole blocking layer, a first electron transport layer, an N-type charge generation layer, a P-type charge generation layer, a second hole transport layer, a second electron blocking layer, a second light-emitting layer, a second hole blocking layer, a second electron transport layer, and an electron injection layer stacked in sequence; Preferably, in a direction perpendicular to the array substrate, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the first light-emitting device is a first thickness, the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the second light-emitting device is a second thickness, and the sum of the thicknesses of the first electron blocking layer and the second electron blocking layer in the third light-emitting device is a third thickness, wherein the first thickness, the second thickness, and the third thickness are not equal; Preferably, the first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, the third light-emitting device is a blue light-emitting device, and the first thickness, the second thickness, and the third thickness decrease in sequence; Preferably, in a direction perpendicular to the array substrate, the thicknesses of the second electron blocking layers in the red light-emitting device, the green light-emitting device, and the blue light-emitting device decrease in sequence.

18. The display panel according to claim 17, wherein in the light-emitting device, in a direction perpendicular to the array substrate, the distance between the first light-emitting layer and the first electrode is not less than a distance D, and the calculation formula for the distance D is: D = 0.33*(λ / n) - 54 where λ is the resonance wavelength of the microcavity formed by the light-emitting device, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

19. The display panel according to claim 16, characterized in that, In a direction perpendicular to the array substrate, the thicknesses of the second electrodes of the third light-emitting device, the first light-emitting device, and the second light-emitting device decrease in sequence; Preferably, in a direction perpendicular to the array substrate, the thicknesses of the second electrodes of the blue light-emitting device, the red light-emitting device, and the green light-emitting device decrease in sequence; Preferably, in a direction perpendicular to the array substrate, the thicknesses of the functional layers on the third light-emitting device, the second light-emitting device, and the first light-emitting device increase in sequence; Preferably, the thicknesses of the functional layers on the blue light-emitting device, the green light-emitting device, and the red light-emitting device increase in sequence.

20. A display device, characterized in that, The display device includes the display panel according to any one of claims 1-19.

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