Display panel and display device

Abstract

SOLUTION: To provide a display panel and a display device, which relate to the display technology field, and in which the display panel 1 includes an array substrate 11, an isolation structure 12, a light-emitting element 13, a functional layer 14, and an encapsulation layer 15, and the light-emitting element 13, the functional layer 14, and the encapsulation layer 15 form microcavities, and the isolation structure 12 isolates different light-emitting elements 13, and the structures of the microcavities corresponding to the light-emitting elements 13 of different colors can be designed differently.EFFECT: As compared with the related art method in which light emitting elements of different colors adopt the same element structure, the light emitting performance of the light emitting elements of different colors can be improved.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to the field of display technology, and in particular to display panels and display devices. [Background technology]

[0002] Organic light-emitting devices (OLEDs) are expected to be the next generation flat panel display technology following liquid crystal displays, and have many unique advantages, such as being self-luminous, all-solid-state, lightweight, and flexible. OLED display panels form a display screen by controlling the emission of light-emitting elements of different colors. Since light-emitting elements of different colors have different light-emitting performances, how to achieve the requirement of good light-emitting performance for all light-emitting elements of different colors is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] To solve the problems mentioned in the above technical background, the present application provides a display device and a display panel.

[0004] According to a first aspect of the present application, there is provided a display panel, the display panel comprising: an array substrate; an isolation structure located on the array substrate and surrounding the isolation structure to form an isolation opening; a light-emitting element located on the array substrate and positioned within the isolation opening; a functional layer located on a side of the light-emitting element that is farther from the array substrate; a sealing layer that covers at least the functional layer, The light emitting element, the functional layer and the encapsulation layer form a microcavity, and the lengths of the microcavities corresponding to the light emitting elements of different colors are different.

[0005] In one possible embodiment of the present application, the length of the microcavity corresponding to the light emitting element is positively correlated with the wavelength of the light emitted by the light emitting element; Preferably, the length of the microcavity corresponding to the light emitting element is equal to the wavelength of the light emitted by the light emitting element.

[0006] In one possible embodiment of the present application, in a direction away from the array substrate, the light emitting element includes a first electrode, a light emitting element layer, and a second electrode, which are stacked in this order; the light emitting elements include a first light emitting element, a second light emitting element, and a third light emitting element; In a direction perpendicular to the array substrate, the thickness of the second electrode of the third light emitting element, the thickness of the second electrode of the first light emitting element, and the thickness of the second electrode of the second light emitting element decrease in this order.

[0007] Preferably, the first light-emitting element is a red light-emitting element, the second light-emitting element is a green light-emitting element, and the third light-emitting element is a blue light-emitting element, and in a direction perpendicular to the array substrate, the thickness of the second electrode of the blue light-emitting element, the thickness of the second electrode of the red light-emitting element, and the thickness of the second electrode of the green light-emitting element decrease in this order.

[0008] In one possible embodiment of the present application, the thicknesses of the functional layers corresponding to the light emitting elements of different colors are different in the direction perpendicular to the array substrate.

[0009] In one possible embodiment of the present application, in a direction perpendicular to the array substrate, the thickness of the functional layer in the third light-emitting element, the thickness of the functional layer in the second light-emitting element, and the thickness of the functional layer in the first light-emitting element increase in this order; Preferably, in a direction perpendicular to the array substrate, the thickness of the functional layer in the blue light emitting element increases in this order, followed by the thickness of the functional layer in the green light emitting element and the thickness of the functional layer in the red light emitting element.

[0010] In one possible embodiment of the present application, the light-emitting element includes at least two light-emitting layers stacked along a direction perpendicular to the array substrate, Preferably, in a direction away from the array substrate, the light-emitting element 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, which are stacked in this order; Preferably, in a direction perpendicular to the array substrate, a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the first light-emitting element is a first thickness, a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the second light-emitting element is a second thickness, and a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the third light-emitting element is a third thickness, and the first thickness, the second thickness, and the third thickness are not equal to each other; Preferably, the first light emitting element is a red light emitting element, the second light emitting element is a green light emitting element, and the third light emitting element is a blue light emitting element.

[0011] In one possible embodiment of the present application, the first thickness, the second thickness and the third thickness decrease in order.

[0012] In one possible embodiment 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 element, the thickness of the second electron blocking layer in the green light-emitting element, and the thickness of the second electron blocking layer in the blue light-emitting element decrease in this order.

[0013] In one possible embodiment of the present application, in a direction away from the array substrate, the light emitting element includes a first electrode, a light emitting element layer, and a second electrode, which are stacked in this order; in the light emitting element, in a direction perpendicular to the array substrate, a distance between the first light emitting layer and the first electrode is equal to or greater than a distance D, and a calculation formula for the distance D is: D=0.33*(λ / n)-54, where λ is the resonant wavelength of the microcavity formed by the light emitting element, and n is the refractive index of the medium between the first light emitting layer and the first electrode.

[0014] In one possible embodiment of the present application, the display panel further comprises a pixel-defining layer, the pixel-defining layer is located on the array substrate side, and the isolation structure is located on a side of the pixel-defining layer away from the array substrate; the pixel definition layer includes a pixel aperture, an orthogonal projection of the pixel aperture on the array substrate covers an orthogonal projection of the light-emitting element on the array substrate, and an orthogonal projection of the isolation aperture on the array substrate covers an orthogonal projection of the pixel aperture 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.

[0015] In one possible embodiment of the present application, the isolation structure includes an isolation portion and a blocking portion that are stacked, the blocking portion being located on a side of the isolation portion that is away from the array substrate, and an orthogonal projection of the isolation portion on the array substrate being located within an orthogonal projection of the blocking portion on the array substrate; Preferably, the blocking portion extends relative to the isolation portion in a direction towards the isolation opening; Preferably, the second electrode extends from the pixel opening to the edge of the isolation opening and overlaps the isolation portion.

[0016] In one possible embodiment of the present application, the isolation structure further includes an isolation base, the isolation portion is located on a side of the isolation base away from the array substrate, and an orthogonal projection of the isolation portion on the array substrate is located within an orthogonal projection of the isolation base on the array substrate; Preferably, the second electrode extends from the pixel opening to the edge of the isolation opening and overlaps the isolation base.

[0017] In one possible embodiment of the present application, the sealing layer comprises a first sealing layer, The first sealing layer includes a plurality of sealing units, each of which is used to seal a light-emitting element in a corresponding isolation opening, and two adjacent sealing units are spaced apart in the isolation structure.

[0018] In one possible embodiment of the present application, the sealing layer further includes a second sealing layer, the second sealing layer being located on a side of the first sealing layer away from the array substrate, and the second sealing layer covering at least the first sealing layer; Preferably, the sealing layer further includes a third sealing layer located on a side of the second sealing layer away from the array substrate, Preferably, the first sealing layer and the third sealing layer are inorganic sealing layers, and the second sealing layer is an organic sealing layer.

[0019] According to a second aspect of the present application, there is provided a display panel, the display panel comprising: an array substrate; a light emitting element including at least two light emitting layers stacked along a direction perpendicular to the array substrate and positioned on the array substrate side; a functional layer located on a side of the light-emitting element that is farther from the array substrate; a sealing layer that covers at least the functional layer, The light-emitting element, the functional layer and the sealing layer form a microcavity, and the lengths of the microcavities corresponding to the light-emitting elements of different colors are different, and the thicknesses of the functional layers corresponding to the light-emitting elements of different colors are different in the direction perpendicular to the array substrate.

[0020] In one possible embodiment of the present application, the length of the microcavity corresponding to the light emitting element is positively correlated with the wavelength of the light emitted by the light emitting element; Preferably, the length of the microcavity corresponding to the light emitting element is equal to the wavelength of the light emitted by the light emitting element; Preferably, in a direction away from the array substrate, the light emitting element includes a first electrode, a light emitting element layer, and a second electrode, which are stacked in this order; Preferably, the light emitting elements include a first light emitting element, a second light emitting element and a third light emitting element.

[0021] In one possible embodiment of the present application, in a direction away from the array substrate, the light-emitting element 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, which are stacked in this order; Preferably, in a direction perpendicular to the array substrate, a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the first light-emitting element is a first thickness, a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the second light-emitting element is a second thickness, and a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the third light-emitting element is a third thickness, and the first thickness, the second thickness, and the third thickness are not equal to each other; Preferably, the first light-emitting element is a red light-emitting element, the second light-emitting element is a green light-emitting element, and the third light-emitting element is a blue light-emitting element, and the first thickness, the second thickness, and the third thickness decrease in this order; Preferably, in a direction perpendicular to the array substrate, the thickness of the second electron blocking layer in the red light-emitting element, the thickness of the second electron blocking layer in the green light-emitting element, and the thickness of the second electron blocking layer in the blue light-emitting element decrease in this order.

[0022] In one possible embodiment of the present application, in the light-emitting element, a distance between the first light-emitting layer and the first electrode in a direction perpendicular to the array substrate is equal to or greater than a distance D, and the distance D is calculated by the following formula: D=0.33*(λ / n)-54, where λ is the resonant wavelength of the microcavity formed by the light emitting element, and n is the refractive index of the medium between the first light emitting layer and the first electrode. In one possible embodiment of the present application, in a direction perpendicular to the array substrate, a thickness of the second electrode of the third light-emitting element, a thickness of the second electrode of the first light-emitting element, and a thickness of the second electrode of the second light-emitting element are reduced in this order; In a direction perpendicular to the array substrate, the thickness of the second electrode of the blue light emitting element, the thickness of the second electrode of the red light emitting element, and the thickness of the second electrode of the green light emitting element are reduced in this order; Preferably, in a direction perpendicular to the array substrate, the thickness of the functional layer in the third light-emitting element, the thickness of the functional layer in the second light-emitting element, and the thickness of the functional layer in the first light-emitting element increase in this order, Preferably, in a direction perpendicular to the array substrate, the thickness of the functional layer in the blue light emitting element increases in the order of the thickness of the functional layer in the green light emitting element and the thickness of the functional layer in the red light emitting element.

[0023] According to a third aspect of the present application, there is provided a display device comprising a display panel according to any possible embodiment of the first or second aspect.

[0024] An embodiment of the present application provides a display panel and a display device, the display panel including an array substrate, an isolation structure, a light emitting element, a functional layer, and an encapsulation layer, the light emitting element, the functional layer, and the encapsulation layer form a microcavity, the isolation structure isolates different light emitting elements, and the structures of the microcavities corresponding to light emitting elements of different colors can be differently designed, thereby improving the light emitting performance of the light emitting elements of different colors. [Brief explanation of the drawings]

[0025] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly describes the drawings that need to be used in the embodiments. The following drawings only illustrate some embodiments of the present application, so they should not be considered as limiting the scope, and it should be understood that those skilled in the art can also obtain other related drawings according to these drawings without creative efforts.

[0026] [Figure 1]1 is a schematic diagram showing a cross-sectional structure of a display panel according to the present embodiment. [Figure 2] 2 is a schematic diagram showing the positional relationship between the light-emitting element and the isolation structure in FIG. 1. FIG. [Figure 3] 2A to 2C are two schematic diagrams showing a cross-sectional structure of a display panel according to the present embodiment. [Figure 4] 2A to 2C are three schematic diagrams showing the cross-sectional structure of a display panel according to the present embodiment. [Figure 5] 4A to 4C are schematic diagrams showing the cross-sectional structure of a display panel according to the present embodiment. [Figure 6] 5A to 5C are schematic diagrams showing the cross-sectional structure of a display panel according to the present embodiment. [Figure 7] 6A to 6C are schematic diagrams showing the cross-sectional structure of a display panel according to the present embodiment. [Figure 8] 1 shows a comparison table of test data between the technical solution of the present application and related technical solutions. [Figure 9] 1 shows a schematic diagram of a film layer structure of a light-emitting element according to this embodiment. [Figure 10] 1 is a schematic diagram showing a film layer structure of a blue light-emitting element according to an embodiment of the present invention; [Figure 11] 10 shows a test curve when the thickness of HTL1 or HTL2 is adjusted to improve the luminous efficiency of the blue light-emitting element. [Figure 12] 1 is a schematic diagram showing a film layer structure of a red light emitting element according to an embodiment of the present invention; [Figure 13] 10 shows a test curve when the thickness of EBL1 or EBL2 is adjusted to improve the luminous efficiency of a red light-emitting element. [Figure 14] 1 is a schematic diagram showing a film layer structure of a green light emitting element according to an embodiment of the present invention; [Figure 15] 10 shows a test curve when the luminous efficiency of a green light-emitting element is improved by adjusting the thickness of EBL1 or EBL2. [Figure 16] Two tables showing test data comparison between the technical proposal of this application and related technical proposals are shown below. [Figure 17] 7A to 7C are schematic diagrams showing the cross-sectional structure of a display panel according to the present embodiment. [Figure 18]8A to 8C are schematic diagrams showing the cross-sectional structure of a display panel according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0027] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Generally, the components of the embodiments of the present application shown in the drawings herein can be arranged and designed in a variety of different configurations.

[0028] In the description of this application, the orientations or positional relationships indicated by terms such as "upper," "lower," etc. are based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships in which the products of this application are normally disposed when used, and are merely for the convenience and simplification of the description of this application, and are not intended to indicate or imply that a specified device or element must have a specific orientation or be configured and operated in a specific orientation, and therefore should not be understood as limiting this application.

[0029] In some display panels, in order to reduce the difficulty of the deposition process of the light-emitting material, isolation structures are provided in the pixel-defining layer between the pixel openings, so that when the light-emitting element layer and the cathode layer are deposited on the entire layer, the light-emitting element layer and the cathode layer between adjacent pixel openings can be cut at the position of the isolation structures, and corresponding light-emitting element film layers can be formed in the pixel openings corresponding to light-emitting elements of different colors through multiple deposition and multiple etching processes.

[0030] Patent PCT / CN2023 / 134518, Chinese Patent 202310759370.2, Patent 202310740412.8, Patent 202310707209.0 and Patent 202311346196.5 provide related technical solutions of isolation structures for reference.

[0031] In related art, the element structures of light-emitting elements of different colors are generally the same, and the same element structure means that the thicknesses of the corresponding film layers constituting the light-emitting elements of different colors are the same and the overall element sizes of the light-emitting elements of different colors are the same. However, since the light-emitting materials and light-emitting efficiencies of the light-emitting elements of different colors are different, it is difficult to optimize the light-emitting performance of all the light-emitting elements of different colors using the same element structure.

[0032] In order to solve the above problems, the inventors have creatively designed the following technical solution, and the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. Note that the defects in the technical solutions of the above prior art are all the result of the inventors' diligent research and practice, and therefore the process of discovering the above problems and the solutions proposed for the above problems in the following examples are all contributions made by the inventors to the present application in the process of invention and creation, and should not be construed as technical content known to those skilled in the art.

[0033] 1 and 2, FIG. 1 is a structural diagram of a display panel according to this embodiment, and FIG. 2 is a schematic diagram showing the positional relationship between light-emitting elements and isolation structures in FIG. 1. In this embodiment, the display panel 1 includes an array substrate 11, an isolation structure 12, light-emitting elements 13, a functional layer 14, and an encapsulation layer 15. The isolation structure 12 is located on the array substrate 11 side and surrounds the array substrate 11 to form isolation openings 121. The light-emitting elements 13 are located within the isolation openings 121, i.e., the orthographic projection of the light-emitting elements 13 on the array substrate 11 is located within the orthographic projection of the isolation openings 121 on the array substrate 11, and one light-emitting element 13 may be provided in each isolation opening 121.

[0034] The functional layer 14 is located on the side of the light-emitting element 13 away from the array substrate 11 and may be a transparent layer with a high refractive index, which is used to reduce the loss of light reflected during emission. The encapsulation layer 15 covers at least the functional layer 14. For example, the encapsulation layer 15 may cover the isolation structure 12, and the side of the encapsulation layer 15 away from the array substrate 11 has a flat surface, allowing subsequent film layers to be deposited on the side of the encapsulation layer 15 away from the array substrate 11. In this embodiment, the light-emitting element 13, the functional layer 14, and the encapsulation layer 15 form a microcavity 20. In a direction perpendicular to the array substrate 11, the length of the microcavity 20 is the sum of the thicknesses of the three layers: the light-emitting element 13, the functional layer 14, and the encapsulation layer 15.

[0035] In this embodiment, the lengths of the microcavities 20 corresponding to the light-emitting elements of different colors are different.

[0036] In the above structure, the light emitting elements 13, the functional layer 14, and the encapsulation layer 15 form microcavities 20, the isolation structures 12 isolate different light emitting elements 13, and the structures corresponding to the microcavities 20 of the light emitting elements 13 of different colors can be designed differently. In particular, the lengths of the microcavities 20 corresponding to the light emitting elements 13 of different colors are different, which can improve the light emitting performance of the light emitting elements 13 of different colors compared to the related art where the light emitting elements 13 of different colors adopt the same element structure.

[0037] In the direction perpendicular to the array substrate 11, the thicknesses of the functional layers 14 corresponding to the light-emitting elements of different colors are different, and the functional layers 14 may have a single-layer structure or a multi-layer structure (e.g., a double-layer structure), and the refractive index of each layer constituting the functional layers 14 can be selected according to actual needs. In this embodiment, by adjusting the thickness of the functional layers 14, the lengths of the microcavities 20 corresponding to the sub-pixel element light-emitting elements 13 of different colors can be adjusted, thereby improving the light-emitting performance of the light-emitting elements 13 of different colors compared to the related art in which the light-emitting elements 13 of different colors adopt the same element structure.

[0038] 3 , in a direction away from the array substrate 11, the light-emitting element 13 includes a first electrode 131, a light-emitting element layer 132, and a second electrode layer 133, which are stacked in this order. The display panel 1 further includes a pixel-defining layer 17, which is located on the array substrate 11 side, 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, which communicates with the isolation opening 121. For example, the orthogonal projection of the pixel opening 171 on the array substrate 11 covers the orthogonal projection of the light-emitting element 13 on the array substrate 11, and the orthogonal projection of the isolation opening 121 on the array substrate 11 covers the orthogonal projection of the pixel opening 171 on the array substrate 11.

[0039] The first electrodes 131 are distributed at intervals on the array substrate 11. For example, the first electrodes 131 are distributed at least at positions on the array substrate 11 corresponding to the isolation openings 121, and the pixel openings 171 expose the first electrodes 131. The light-emitting element layer 132 extends from the pixel openings 171 to a side of the pixel-defining layer 17 away from the array substrate 11, and the second electrode 133 extends from the pixel openings 171 to the edge of the isolation openings 121 and is connected to the isolation structure 12 around the isolation openings 121. In this embodiment, the first electrode 131 may be an anode of the light-emitting element 13, and the second electrode 133 may be a cathode of the light-emitting element 13. Furthermore, 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.

[0040] 4, the isolation structure 12 includes an isolation portion 123 and a blocking portion 124 stacked together, where the blocking portion 124 is located on the side of the isolation portion 123 away from the array substrate 11, the orthogonal projection of the isolation portion 123 on the array substrate 11 is located within the orthogonal projection of the blocking portion 124 on the array substrate 11, and the blocking portion 124 extends relative to the isolation portion 123 in a direction toward the isolation opening 121. 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.

[0041] 5 , in this embodiment, the isolation structure 12 may further include an isolation base 122, in which the isolation base 122, the isolation portion 123, and the blocking portion 124 are stacked in order, with the orthogonal projection of the isolation portion 123 on the array substrate 11 located within the orthogonal projection of the isolation base 122 on the array substrate 11, and the orthogonal projection of the isolation base 122 on the array substrate 11 located within the orthogonal projection of the blocking portion 124 on the array substrate 11. That is, in the direction toward the isolation opening 121, the isolation base 122 and the blocking portion 124 extend relative to the isolation portion 123, and for example, the second electrode 133 extends from the pixel opening 171 to the edge of the isolation opening 121 and overlaps with the isolation base 122.

[0042] 6, the encapsulation layer 15 includes a first encapsulation layer 151, which includes a plurality of encapsulation units 1511, each of which is spaced apart from the isolation structure 12. The encapsulation units 1511 are made of an inorganic material and fabricated by chemical vapor deposition. Each encapsulation unit 1511 is used to independently encapsulate the light-emitting element 13 in one isolation opening 121. Referring to FIG. 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 element 13, and the side of the second encapsulation layer 152 away from the array substrate 11 forms a flat surface. The third encapsulation layer 153 is located on the side of the second encapsulation layer 152 away from the array substrate 11. Here, the second sealing layer 152 is manufactured by inkjet printing, and the third sealing layer 153 is manufactured by chemical vapor deposition. The first sealing layer 151 and the third sealing layer 153 are inorganic sealing layers, and the second sealing layer 152 is an organic sealing layer. The first sealing layer 151, the second sealing layer 152, and the third sealing layer 153 form a thin film sealing structure of the display panel 1.

[0043] In order to improve the light output efficiency of the light emitting element 13 and reduce the power consumption of the element, microcavity resonance (constructive interference of reflected light in the microcavity) can be utilized to improve the light output efficiency, where the first electrode is a fully reflective electrode of the microcavity 20 and the second electrode is a semi-reflective electrode of the microcavity 20. In this embodiment, the microcavity resonance can be achieved by adjusting the length of the microcavity 20 corresponding to the light emitting element 13, where the length of the microcavity 20 corresponding to the light emitting element 13 is positively correlated with the wavelength of the light emitted by the light emitting element 13, i.e., the longer the wavelength of the light emitted by the light emitting element 13, the longer the length of the corresponding microcavity 20.

[0044] For example, the length L of the microcavity 20 can be calculated by the following equation (1):

[0045]

number

[0046] where ni is the refractive index of the ith film layer in the microcavity, di is the thickness of the ith film layer in the microcavity, Ψ1 and Ψ2 are the reflection phase shifts of the fully reflective electrode and the semi-reflective electrode in the microcavity, respectively, m is the order of the microcavity, λ is the resonant wavelength of the microcavity, and m is a positive integer.

[0047] In this embodiment, the value of m may be 2, and when L=λ, that is, the length L of the microcavity 20 is equal to the resonant wavelength of the second-order microcavity, which is equal to the wavelength of the light generated by the light-emitting element 13, the interference of the reflected light in the microcavity 20 is completely constructive, thereby improving the light output efficiency and reducing the power consumption of the element.

[0048] The light emitting element 13 includes a first light emitting element, a second light emitting element, and a third light emitting element, each of which emits light of a different color, and the wavelengths of the light emitted by the first light emitting element, the second light emitting element, and the third light emitting element decrease in order. For example, the first light emitting element, the second light emitting element, and the third light emitting element may correspond to a red light emitting element R, a green light emitting element G, and a blue light emitting element B, respectively. The red light emitting element R, the green light emitting element G, and the blue light emitting element B constitute a light emitting pixel, and the color and brightness of the light emitting pixel can be adjusted by changing the emission brightness of the red light emitting element R, the green light emitting element G, and the blue light emitting element B. Hereinafter, an example will be described in which the first light emitting element, the second light emitting element, and the third light emitting element correspond to the red light emitting element R, the green light emitting element G, and the blue light emitting element B, respectively.

[0049] The effect of the microcavity 20 on enhancing the emitted light from the light emitting element 13 can be evaluated by the full width at half maximum (FWHM), and the formula (2) for calculating the full width at half maximum (FWHM) is as follows:

[0050]

number

[0051] Here, R1 and R2 are the reflectivities of the fully reflective electrode and the semi-reflective electrode, respectively. The smaller the FWHM, the greater the enhancement of the light emitted from the light-emitting element 13 by the microcavity 20, and at the same time, the narrower the wavelength range of the emitted light.

[0052] Because the light-emitting efficiency of the blue light-emitting element B (third light-emitting element) is not high, the thickness of the second electrode 133 of the blue light-emitting element B is increased, and the full width at half maximum FWHM of the microcavity corresponding to the blue light-emitting element B is reduced, thereby increasing the light emission efficiency of the blue light-emitting element. The green light generated by the green light-emitting element G (second light-emitting element) accounts for the largest proportion of the white light combined. To avoid affecting the brightness attenuation of the white light, the wavelength range of the emitted green light must be as wide as possible and the full width at half maximum FWHM corresponding to the microcavity of the green light-emitting element G must be as large as possible. That is, the thickness of the second electrode 133 of the green light-emitting element G cannot be too thick. For this reason, in this embodiment, the thicknesses of the second electrode 133 of the blue light-emitting element B, the second electrode 133 of the red light-emitting element R (first light-emitting element), and the second electrode 133 of the green light-emitting element G are made thinner in this order.

[0053] Furthermore, this can be achieved by adjusting the thickness of the functional layer 14 in the light-emitting elements 13 of each color to match the length of the microcavities 20 corresponding to the light-emitting elements 13 of each color with the wavelength of light emitted by the light-emitting elements 13. In detail, the red light-emitting element R emits light with the longest wavelength, and the functional layer 14 in the red light-emitting element R has the thickest thickness; the green light-emitting element G emits light with the next longest wavelength, and the functional layer 14 in the green light-emitting element G has the next thickest thickness; the blue light-emitting element B emits light with the shortest wavelength, and the functional layer 14 in the blue light-emitting element B has the thinnest thickness. That is, in this embodiment, the thickness of the functional layer 14 in the blue light-emitting element B is thicker than the thickness of the functional layer 14 in the green light-emitting element G, and the functional layer 14 in the red light-emitting element R is thicker in this order.

[0054] 8 shows a comparison table between the technical solution of the present application and the related technical solution. The light-emitting devices of different colors in the related technical solution have the same device structure. Compared with the related technical solution, the power consumption of the technical solution of the present application is reduced by 31.5%, and the color difference (JNCD) at different observation viewing angles is also lower than that of the related technical solution. For example, when the observation viewing angle is 30°, the color difference of the technical solution of the present application is 0.8, which is 0.6 less than that of the related technical solution. When the observation viewing angle is 45°, the color difference of the technical solution of the present application is 1.3, which is 0.9 less than that of the related technical solution. When the observation viewing angle is 60°, the color difference of the technical solution of the present application is 1.8, which is 0.2 less than that of the related technical solution. When the observation viewing angle is 75°, the color difference of the technical solution of the present application is 2, which is 0.8 less than that of the related technical solution. When the observation viewing angle is 80°, the color difference of the technical solution of the present application is 2.2, which is 1.3 less than that of the related technical solution. That is, it can be seen from the above data that the above technical solution of the present application can reduce the power consumption of the display panel and improve the color difference at different viewing angles.

[0055] In this embodiment, the light-emitting element 13 may be a stacked light-emitting element, that is, in the direction perpendicular to the array substrate 11, the light-emitting element 13 includes at least two stacked light-emitting layers, and further, the orthogonal projections of different light-emitting layers on the array substrate may overlap.

[0056] 9, the light-emitting element layer 132 includes, in order from the direction away from the array substrate 11, a hole injection layer HIL (Hole Injection Layer), a first hole transport layer HTL1 (Hole Transport Layer), a first electron blocking layer EBL1 (Electron-Blocking Layer), a first light-emitting layer EML1 (Emission Layer), a first hole blocking layer HBL1 (Hole Blocking 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 light-emitting layer EML2, a second hole blocking layer HBL2, a second electron transport layer ETL2, and an electron injection layer EIL (Electron Injection Layer).

[0057] In this embodiment, the luminous efficiency of stacked light-emitting devices of different colors can be improved by adjusting the thicknesses of different film layers in the light-emitting device layer 132. For example, the luminous efficiency of blue light-emitting device B (third light-emitting device) can be improved by adjusting the thicknesses of the first hole transport layer HTL1 and the second hole transport layer HTL2. Referring to FIGS. 10 and 11 , 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 fixing HTL2 and adjusting the thickness of HTL1 has a more significant effect on improving the luminous efficiency of blue light-emitting device B, and the difference in chromaticity-light intensity curves under different thickness conditions of HTL1 is small. Thus, significant changes in luminous efficiency due to differences in the thickness of HTL1 caused by deposition errors can be avoided. That is, in this embodiment, the luminous efficiency of blue light-emitting device B can be improved by adjusting the thickness of HTL1.

[0058] For example, to improve the luminous efficiency of the red light-emitting element R (first light-emitting element), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the red light-emitting element R can be adjusted. Referring to FIGS. 12 and 13 , when the thickness of EBL2 (RPL2) is adjusted without changing the thickness of EBL1 (RPL1), the luminous efficiency of the red light-emitting element R is improved, and the difference in the chromaticity-light intensity curves under different thickness conditions of EBL2 (RPL2) is reduced. Thus, it is possible to prevent a large change in luminous efficiency due to a difference in the thickness of EBL2 (RPL2) caused by deposition error. That is, in this embodiment, the luminous efficiency of the red light-emitting element R can be improved by adjusting the thickness of EBL2 (RPL2).

[0059] Similarly, to improve the luminous efficiency of the green light-emitting element G (second light-emitting element), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the green light-emitting element G can be adjusted. Referring to Figures 14 and 15, fixing the thickness of EBL1 (GPL1) and adjusting the thickness of EBL2 (GPL2) improves the luminous efficiency of the green light-emitting element G and reduces the difference in the chromaticity-light intensity curves under different thickness conditions of EBL2 (GPL2). This prevents significant changes in luminous efficiency due to differences in the thickness of EBL2 (GPL2) caused by deposition errors. That is, in this embodiment, adjusting the thickness of EBL2 (GPL2) improves the luminous efficiency of the green light-emitting element G.

[0060] In this embodiment, by adjusting the thickness of the HTL1 in the blue light-emitting element B, the thickness of the EBL2 (RPL2) in the red light-emitting element R, and the thickness of the EBL2 (GPL2) in the green light-emitting element G, the light emission efficiency of the three different color light-emitting elements 13 can be improved and the power consumption of the light-emitting elements 13 can be reduced.

[0061] 10, 12, and 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 element R is a 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 element G is a 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 element B is a third thickness (d31+d32), and the first thickness, second thickness, and third thickness are not equal. Illustratively, the first thickness, second thickness, and third thickness are smaller in this order.

[0062] 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 element R, the thickness d22 of the second electron blocking layer in the green light-emitting element G, and the thickness d23 of the second electron blocking layer in the blue light-emitting element B decrease in this order.

[0063] In this embodiment, in order to improve the light emission efficiency of the light-emitting element 13, the distance between the first light-emitting layer EML1 and the first electrode 131 in the light-emitting element 13 is equal to or greater than the distance D, and the calculation formula for the distance D is as follows: D=0.33*(λ / n)-54 where λ is the resonant wavelength of the microcavity corresponding to the light-emitting element, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

[0064] 16 shows a comparison table of luminous efficiency between the stacked light emitting device according to this embodiment and a stacked light emitting device according to the related art. Under essentially the same chromaticity CIEy conditions, the light emitting device 13 according to this embodiment significantly improves the maximum value of the luminous intensity B I of the first emitting layer EML1, thereby improving the overall luminous efficiency of the light emitting device 13. For example, as shown in FIG. 16 , in the related art, the maximum value of the luminous intensity B I of the first emitting layer EML1 is 83.2%, the maximum value of the luminous intensity B I of the second emitting layer EM2 is 100%, and the maximum value of the total luminous intensity B I of the light emitting device 13 is 182.8%. However, in the present technical solution, the maximum value of the luminous intensity B I of the first emitting layer EML1 is 103.1%, the maximum value of the luminous intensity B I of the second emitting layer EM2 is 100%, and the maximum value of the total luminous intensity B I of the light emitting device 13 is 203.1%. That is, compared to the related art, the luminous intensity of the first emitting layer EML1 of the light emitting device 13 according to the embodiment of the present application and the total luminous intensity of the light emitting device 13 are both improved.

[0065] Based on the same inventive idea, an embodiment of the present application further provides a display panel. Referring to Fig. 17, the display panel 1 includes an array substrate 11, a light-emitting element 13, a functional layer 14, and a sealing layer 15. The light-emitting element 13 is located on the array substrate 11 side and includes at least two light-emitting layers stacked along a direction perpendicular to the array substrate 11. Preferably, orthogonal projections of different light-emitting layers on the array substrate 11 overlap.

[0066] The functional layer 14 is located on the side of the light-emitting element 13 away from the array substrate 11. The functional layer 14 may be a transparent layer with a high refractive index and is used to reduce the loss of light reflected during emission. The sealing layer 15 covers at least the functional layer 14. The side of the sealing layer 15 away from the array substrate 11 has a flat surface, allowing subsequent film layers to be deposited on the side of the sealing layer 15 away from the array substrate 11. In this embodiment, the film layer on the side of the first electrode of the light-emitting element 13 away from the array substrate 11 forms a microcavity 20. That is, in the direction away from the array substrate 11, the microcavity 20 consists of the light-emitting element 13, the functional layer 14, and the sealing layer 15, which are stacked in this order. In the direction perpendicular to the array substrate 11, the length of the microcavity 20 is the sum of the thicknesses of the light-emitting element 13, the functional layer 14, and the sealing layer 15.

[0067] In this embodiment, the lengths of the microcavities 20 corresponding to the light-emitting elements of different colors are different.

[0068] In the above structure, the lengths of the microcavities 20 corresponding to the light-emitting elements 13 of different colors are different, which can improve the light-emitting performance of the light-emitting elements 13 of different colors compared to the related art method in which the light-emitting elements 13 of different colors adopt the same element structure.

[0069] In the direction perpendicular to the array substrate 11, the thicknesses of the functional layers 14 corresponding to the light-emitting elements of different colors are different, and the functional layers 14 may have a single-layer structure or a multi-layer structure (e.g., a double-layer structure), and the refractive index of each layer constituting the functional layers 14 can be selected according to actual needs. In this embodiment, by adjusting the thickness of the functional layers 14, the lengths of the microcavities 20 corresponding to the sub-pixel element light-emitting elements 13 of different colors can be adjusted, thereby improving the light-emitting performance of the light-emitting elements 13 of different colors compared to the related art in which the light-emitting elements 13 of different colors adopt the same element structure.

[0070] In this embodiment, in order to improve the light output efficiency of the light-emitting element 13 and reduce the power consumption of the element, microcavity resonance (constructive interference of reflected light in the microcavity) can be utilized to improve the light output efficiency, where the first electrode is a fully reflective electrode of the microcavity 20, and the second electrode is a semi-reflective electrode of the microcavity 20. In this embodiment, the microcavity resonance can be realized by adjusting the length of the microcavity 20 corresponding to the light-emitting element 13, where the length of the microcavity 20 corresponding to the light-emitting element 13 is positively correlated with the wavelength of the light emitted by the light-emitting element 13, i.e., the longer the wavelength of the light emitted by the light-emitting element 13, the longer the length of the corresponding microcavity 20.

[0071] For example, the length L of the microcavity 20 can be calculated by the following equation (3):

[0072]

number

[0073] where ni is the refractive index of the ith film layer in the microcavity, di is the thickness of the ith film layer in the microcavity, Ψ1 and Ψ2 are the reflection phase shifts of the fully reflective electrode and the semi-reflective electrode in the microcavity, respectively, m is the order of the microcavity, λ is the resonant wavelength of the microcavity, and m is a positive integer.

[0074] In this embodiment, the value of m may be 2, and when L=λ, that is, the length L of the microcavity 20 is equal to the resonant wavelength of the second-order microcavity, which is equal to the wavelength of the light generated by the light-emitting element 13, the interference of the reflected light in the microcavity 20 is completely constructive, thereby improving the light output efficiency and reducing the power consumption of the element.

[0075] The light emitting element 13 includes a first light emitting element, a second light emitting element, and a third light emitting element, where the first light emitting element, the second light emitting element, and the third light emitting element are each for emitting light of a different color, and the wavelengths of the light emitted by the first light emitting element, the second light emitting element, and the third light emitting element are each for emitting light of a smaller wavelength. For example, the first light emitting element, the second light emitting element, and the third light emitting element may correspond to a red light emitting element R, a green light emitting element G, and a blue light emitting element B, respectively. The red light emitting element R, the green light emitting element G, and the blue light emitting element B constitute a light emitting pixel, and the color and brightness of the light emitting pixel can be adjusted by changing the emission brightness of the red light emitting element R, the green light emitting element G, and the blue light emitting element B. Hereinafter, an example will be described in which the first light emitting element, the second light emitting element, and the third light emitting element correspond to the red light emitting element R, the green light emitting element G, and the blue light emitting element B, respectively.

[0076] 18 , in a direction away from the array substrate 11, the light-emitting element 13 includes a first electrode 131, a light-emitting element layer 132, and a second electrode layer 133, which are stacked in this order. The display panel 1 further includes a pixel-defining layer 17, which is located on the array substrate 11 side and includes a pixel opening, and the light-emitting element 13 is located within the pixel opening. In this embodiment, the first electrode 131 may be an anode of the light-emitting element 13, and the second electrode 133 may be a cathode of the light-emitting element 13. The first electrode is a fully reflective electrode of the microcavity 20, and the second electrode is a semi-reflective electrode of the microcavity 20. Furthermore, 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.

[0077] 9 again, in this embodiment, in a direction away from the array substrate 11, the light-emitting element layer 132 includes, stacked in order, a hole injection layer HIL (Hole Injection Layer), a first hole transport layer HTL1 (Hole Transport Layer), a first electron blocking layer EBL1 (Electron-Blocking Layer), a first light-emitting layer EML1 (Emission layer), a first hole blocking layer HBL1 (Hole Blocking 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 light-emitting layer EML2, a second hole blocking layer HBL2, a second electron transport layer ETL2, and an electron injection layer EIL (Electron Injection Layer).

[0078] In this embodiment, improving the luminous efficiency of stacked light-emitting devices of different colors can be achieved by adjusting the thicknesses of different film layers in the light-emitting device layer 132. For example, to improve the luminous efficiency of blue light-emitting device B (third light-emitting device), the thicknesses of the first hole transport layer HTL1 and the second hole transport layer HTL2 can be adjusted. Referring again to FIGS. 10 and 11 , 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 fixing HTL2 and adjusting the thickness of HTL1 has a more significant effect on improving the luminous efficiency of blue light-emitting device B, and the difference in chromaticity-light intensity curves under different thickness conditions of HTL1 is small. Thus, significant changes in luminous efficiency due to differences in the thickness of HTL1 caused by deposition errors can be avoided. That is, in this embodiment, adjusting the thickness of HTL1 can improve the luminous efficiency of blue light-emitting device B.

[0079] For example, to improve the luminous efficiency of the red light-emitting element R (first light-emitting element), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the red light-emitting element R can be adjusted. Referring again to FIGS. 12 and 13 , when the thickness of EBL2 (RPL2) is adjusted without changing the thickness of EBL1 (RPL1), the luminous efficiency of the red light-emitting element R is improved, and the difference in the chromaticity-light intensity curves under different thickness conditions of EBL2 (RPL2) is reduced. Thus, it is possible to avoid significant changes in luminous efficiency due to differences in the thickness of EBL2 (RPL2) caused by deposition errors. That is, in this embodiment, the luminous efficiency of the red light-emitting element R can be improved by adjusting the thickness of EBL2 (RPL2).

[0080] Similarly, to improve the luminous efficiency of the green light-emitting element G (second light-emitting element), the thickness of the first electron blocking layer EBL1 or the second electron blocking layer EBL2 in the green light-emitting element G can be adjusted. Referring again to FIGS. 14 and 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 element G is increased and the difference in the chromaticity-light intensity curves under different thickness conditions of EBL2 (GPL2) is reduced. This prevents significant changes in luminous efficiency due to differences in the thickness of EBL2 (GPL2) caused by deposition errors. That is, in this embodiment, the luminous efficiency of the green light-emitting element G can be improved by adjusting the thickness of EBL2 (GPL2).

[0081] In this embodiment, by adjusting the thickness of the HTL1 in the blue light-emitting element B, the thickness of the EBL2 (RPL2) in the red light-emitting element R, and the thickness of the EBL2 (GPL2) in the green light-emitting element G, the light emission efficiency of the three different color light-emitting elements 13 can be improved and the power consumption of the light-emitting elements 13 can be reduced.

[0082] 10, 12, and 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 element 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 element 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 element B is the third thickness (d31+d32), and the first thickness, second thickness, and third thickness are not equal. Illustratively, the first thickness, second thickness, and third thickness are smaller in this order.

[0083] 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 element R, the thickness d22 of the second electron blocking layer in the green light-emitting element G, and the thickness d23 of the second electron blocking layer in the blue light-emitting element B decrease in this order.

[0084] In this embodiment, in order to improve the light emission efficiency of the light-emitting element 13, the distance between the first light-emitting layer EML1 and the first electrode 131 in the light-emitting element 13 is equal to or greater than the distance D, and the calculation formula for the distance D is as follows: D=0.33*(λ / n)-54 where λ is the resonant wavelength of the microcavity corresponding to the light-emitting element, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

[0085] In this embodiment, the enhancement of the emitted light from the light emitting element 13 due to the microcavity 20 can be evaluated by the full width at half maximum FWHM, and the calculation formula (4) for the full width at half maximum FWHM is as follows:

[0086]

number

[0087] Here, R1 and R2 are the reflectivities of the fully reflective electrode and the semi-reflective electrode, respectively. The smaller the FWHM, the greater the enhancement of the light emitted from the light-emitting element 13 by the microcavity 20, and at the same time, the narrower the wavelength range of the emitted light.

[0088] Because the light-emitting efficiency of the blue light-emitting element B (third light-emitting element) is not high, the thickness of the second electrode 133 of the blue light-emitting element B is increased, and the full width at half maximum FWHM of the microcavity corresponding to the blue light-emitting element B is reduced, thereby increasing the light emission efficiency of the blue light-emitting element. The green light generated by the green light-emitting element G (second light-emitting element) accounts for the largest proportion of the white light combined. To avoid affecting the brightness attenuation of the white light, the wavelength range of the emitted green light must be as wide as possible and the full width at half maximum FWHM corresponding to the microcavity of the green light-emitting element G must be as large as possible. That is, the thickness of the second electrode 133 of the green light-emitting element G cannot be too thick. For this reason, in this embodiment, the thicknesses of the second electrode 133 of the blue light-emitting element B, the second electrode 133 of the red light-emitting element R (first light-emitting element), and the second electrode 133 of the green light-emitting element G are made thinner in this order.

[0089] Furthermore, this can be achieved by adjusting the thickness of the functional layer 14 in the light-emitting elements 13 of each color to match the length of the microcavities 20 corresponding to the light-emitting elements 13 of each color with the wavelength of light emitted by the light-emitting elements 13. In detail, the red light-emitting element R emits light with the longest wavelength, and the functional layer 14 in the red light-emitting element R has the thickest thickness; the green light-emitting element G emits light with the next longest wavelength, and the functional layer 14 in the green light-emitting element G has the next thickest thickness; the blue light-emitting element B emits light with the shortest wavelength, and the functional layer 14 in the blue light-emitting element B has the thinnest thickness. That is, in this embodiment, the thickness of the functional layer 14 in the blue light-emitting element B is thicker than the thickness of the functional layer 14 in the green light-emitting element G, and the functional layer 14 in the red light-emitting element R is thicker in this order.

[0090] Based on the same inventive idea, the embodiments of the present application further provide a display device including the display panel described in the above embodiments, wherein the display panel can improve the light-emitting performance of light-emitting elements of different colors, thereby requiring less power consumption while ensuring the same display brightness, which is beneficial to improving the driving range of the display device.

[0091] As described above, the embodiments of the present application provide a display panel and a display device including an array substrate, an isolation structure, a light-emitting element, a functional layer, and an encapsulation layer, wherein the light-emitting element, the functional layer, and the encapsulation layer form a microcavity, the isolation structure isolates different light-emitting elements, and the structures corresponding to the microcavities of light-emitting elements of different colors can be designed differently, which can improve the light-emitting performance of the light-emitting elements of different colors compared to the related art in which light-emitting elements of different colors adopt the same element structure.

[0092] The above is only a preferred embodiment of the present application, and does not limit the present application, and those skilled in the art can make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. [Explanation of symbols]

[0093] 1—display panel; 11—array substrate; 12—isolation structure; 121—isolation opening; 122—isolation base; 123—isolation portion; 124—blocking portion; 13—light-emitting element; 131—first electrode; 132—light-emitting element layer; 133—second electrode; 14—functional layer; 15—encapsulating layer; 151—first encapsulating layer; 152—second encapsulating layer; 153—third encapsulating layer; 17—pixel defining layer; 171—pixel opening.

Claims

1. an array substrate; an isolation structure located on the array substrate and surrounding the isolation structure to form an isolation opening; a light-emitting element located on the array substrate and positioned within the isolation opening; a functional layer located on a side of the light-emitting element that is farther from the array substrate; a sealing layer that covers at least the functional layer, a microcavity is formed by the light emitting element, the functional layer, and the sealing layer, and the lengths of the microcavities corresponding to the light emitting elements of different colors are different; A display panel characterized by:

2. the length of the microcavity corresponding to the light emitting element is positively correlated with the wavelength of the light emitted by the light emitting element; 2. The display panel according to claim 1, wherein:

3. In a direction away from the array substrate, the light emitting element includes a first electrode, a light emitting element layer, and a second electrode, which are stacked in this order; The light emitting element includes a first light emitting element, a second light emitting element, and a third light emitting element, In a direction perpendicular to the array substrate, a thickness of the second electrode of the third light emitting element, a thickness of the second electrode of the first light emitting element, and a thickness of the second electrode of the second light emitting element decrease in this order.

2. The display panel according to claim 1, wherein:

4. In a direction perpendicular to the array substrate, the thickness of the functional layer in the third light-emitting element, the thickness of the functional layer in the second light-emitting element, and the thickness of the functional layer in the first light-emitting element increase in this order.

4. The display panel according to claim 3, wherein:

5. Along a direction perpendicular to the array substrate, the light emitting device includes at least two stacked light emitting layers; In a direction away from the array substrate, the light-emitting element 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, which are stacked in this order; In a direction perpendicular to the array substrate, a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the first light-emitting element is a first thickness, a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the second light-emitting element is a second thickness, and a sum of thicknesses of the first electron blocking layer and the second electron blocking layer in the third light-emitting element is a third thickness; the first light-emitting element is a red light-emitting element, the second light-emitting element is a green light-emitting element, and the third light-emitting element is a blue light-emitting element; the first thickness, the second thickness, and the third thickness decrease in this order; 5. The display panel according to claim 3 or 4.

6. In a direction perpendicular to the array substrate, the thickness of the second electron blocking layer in the red light emitting element, the thickness of the second electron blocking layer in the green light emitting element, and the thickness of the second electron blocking layer in the blue light emitting element decrease in this order.

6. The display panel according to claim 5, wherein:

7. In the light-emitting element, a distance between the first light-emitting layer and the first electrode in a direction perpendicular to the array substrate is equal to or greater than a distance D, and the distance D is calculated by the following formula: D=0.33*(λ / n)−54, where λ is the resonant wavelength of the microcavity formed by the light-emitting element, and n is the refractive index of the medium between the first light-emitting layer and the first electrode.

6. The display panel according to claim 5, wherein:

8. further comprising a pixel-defining layer; the pixel-defining layer is located on the array substrate side, and the isolation structure is located on a side of the pixel-defining layer away from the array substrate; the pixel definition layer includes a pixel aperture, an orthogonal projection of the pixel aperture on the array substrate covers an orthogonal projection of the light-emitting element on the array substrate, and an orthogonal projection of the isolation aperture on the array substrate covers an orthogonal projection of the pixel aperture on the array substrate; the second electrode extends from the pixel opening to an edge of the isolation opening and is electrically connected to the isolation structure; the isolation structure includes an isolation portion and a blocking portion that are stacked, the blocking portion being located on a side of the isolation portion that is away from the array substrate, and an orthogonal projection of the isolation portion on the array substrate being located within an orthogonal projection of the blocking portion on the array substrate; the second electrode extends from the pixel opening to an edge of the isolation opening and overlaps the isolation portion; the isolation structure further includes an isolation base, the isolation portion is located on a side of the isolation base away from the array substrate, and an orthogonal projection of the isolation portion on the array substrate is located within an orthogonal projection of the isolation base on the array substrate; the sealing layer includes a first sealing layer; the first sealing layer includes a plurality of sealing units, each sealing unit is used to seal a light-emitting element in a corresponding isolation opening, and two adjacent sealing units are spaced apart in the isolation structure; 4. The display panel according to claim 3, wherein:

9. an array substrate; a light emitting element including at least two light emitting layers stacked along a direction perpendicular to the array substrate and positioned on the array substrate side; a functional layer located on a side of the light-emitting element that is farther from the array substrate; a sealing layer that covers at least the functional layer, The light emitting element, the functional layer and the encapsulation layer form a microcavity, and the lengths of the microcavities corresponding to the light emitting elements of different colors are different. A display panel characterized by:

10. A display panel comprising the display panel according to claim 1 or 9. A display device characterized by:

Images