Display panel and preparation method therefor, and display apparatus

Abstract

The present application relates to a display panel and a preparation method therefor, and a display apparatus. The display panel comprises: a substrate; and a first light-emitting element, a second light-emitting element, and a third light-emitting element, which are disposed on one side of the substrate. The wavelength of light emitted by the first light-emitting element is shorter than the wavelength of light emitted by the second light-emitting element, and the wavelength of light emitted by the second light-emitting element is shorter than the wavelength of light emitted by the third light-emitting element. A microcavity order of the first light-emitting element is greater than or equal to 3, the microcavity order of the first light-emitting element is greater than a microcavity order of the second light-emitting element, and the microcavity order of the first light-emitting element is greater than a microcavity order of the third light-emitting element. The greatest absolute value among absolute values of differences between two among the thickness of the first light-emitting member, the thickness of the second light-emitting member, and the thickness of the third light-emitting member is less than a first preset value.

Description

Display panel and its manufacturing method, display device

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on October 24, 2024, with application number 202411489832.4 and entitled "Display panel and method of preparation thereof, display device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of display technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0004] Organic Light Emitting Diode (OLED) display technology is considered the most promising next-generation flat panel display technology. Compared to LCD technology, OLED technology has advantages such as low energy consumption, low cost, self-emissiveness, wide viewing angle, and fast response speed. However, current OLED display panels still suffer from high manufacturing costs. Summary of the Invention

[0005] Therefore, it is necessary to provide a display panel, a method for manufacturing the same, and a display device.

[0006] In a first aspect, embodiments of this application provide a display panel, including:

[0007] substrate;

[0008] A first light-emitting element, a second light-emitting element, and a third light-emitting element are disposed on one side of the substrate; the wavelength of the light emitted by the first light-emitting element is less than the wavelength of the light emitted by the second light-emitting element, and the wavelength of the light emitted by the second light-emitting element is less than the wavelength of the light emitted by the third light-emitting element.

[0009] Wherein, the microcavity order of the first light-emitting element is greater than or equal to 3, and the microcavity order of the first light-emitting element is greater than the microcavity order of the second light-emitting element and the microcavity order of the third light-emitting element;

[0010] The maximum absolute value of the absolute values ​​of the differences between the thicknesses of the first light-emitting element, the second light-emitting element, and the third light-emitting element is less than a first preset value.

[0011] The display panel provided in this application embodiment has the following advantages: the microcavity order of the first light-emitting element is greater than that of the second and third light-emitting elements, and the microcavity order of the first light-emitting element is not less than 3; the maximum difference in thickness among the three light-emitting elements is less than a first preset value. Thus, during the fabrication of the first, second, and third light-emitting elements, the thickness difference between different colored light-emitting elements can be controlled using a smaller number of film layers, thereby reducing the number of exposure times for the film layers and lowering manufacturing costs.

[0012] Secondly, embodiments of this application provide a display panel, including:

[0013] substrate;

[0014] A first light-emitting element, a second light-emitting element, and a third light-emitting element are disposed on one side of the substrate; the first light-emitting element, the second light-emitting element, and the third light-emitting element emit different colors; the first light-emitting element includes a first electrode, a first functional layer group, a first light-emitting layer, a second functional layer group, and a second electrode stacked along the direction away from the substrate; the second light-emitting element includes a third electrode, a third functional layer group, a second light-emitting layer, a fourth functional layer group, and a fourth electrode stacked along the direction away from the substrate; the third light-emitting element includes a fifth electrode, a fifth functional layer group, a third light-emitting layer, a sixth functional layer group, and a sixth electrode stacked along the direction away from the substrate;

[0015] Among the absolute values ​​of the pairwise differences between the thickness of the first light-emitting element, the thickness of the second light-emitting element, and the thickness of the third light-emitting element, the minimum absolute value is equal to the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the minimum absolute value; the maximum absolute value is equal to the sum of the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the maximum absolute value and the absolute value of the difference between the thicknesses of the thickness adjustment film layer.

[0016] If the absolute value of the thickness difference between the first and second light-emitting elements is the maximum absolute value, then the first and third electrodes are reused as a thickness adjustment film layer, or any film layer in either of the two functional layer groups of the first and second light-emitting elements is reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the first and third light-emitting elements is the maximum absolute value, then the first and fifth electrodes are reused as a thickness adjustment film layer, or any film layer in either of the two functional layer groups of the first and third light-emitting elements is reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the second and third light-emitting elements is the maximum absolute value, then the third and fifth electrodes are reused as a thickness adjustment film layer, or any film layer in either of the two functional layer groups of the second and third light-emitting elements is reused as a thickness adjustment film layer.

[0017] Thirdly, embodiments of this application provide a display device, including the display panel in the first and second aspect embodiments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a partial cross-sectional structural diagram of a display panel provided in an embodiment of this application.

[0020] Figure 2 is a schematic diagram of the thickness of the first light-emitting element provided in an embodiment of this application under different microcavity orders.

[0021] Figure 3 is a schematic diagram of the thickness of the second light-emitting element provided in an embodiment of this application under different microcavity orders.

[0022] Figure 4 is a schematic diagram of the thickness of the third light-emitting element provided in an embodiment of this application under different microcavity orders.

[0023] Figure 5 is a graph showing the relationship between the external quantum efficiency and current density of the first light-emitting layer at different thicknesses according to an embodiment of this application.

[0024] Figure 6 is a graph showing the relationship between the brightness and time of the first light-emitting layer at different thicknesses according to an embodiment of this application.

[0025] Figure 7 is a schematic diagram of the structure of the first light-emitting element provided in another embodiment of this application.

[0026] Figure 8 is a structural schematic diagram of the first light-emitting element provided in another embodiment of this application.

[0027] Figure 9 is a schematic flowchart of a method for preparing a display panel according to an embodiment of this application.

[0028] Figure 10 is a flowchart illustrating a method for preparing a display panel according to another embodiment of this application.

[0029] Figure 11 is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0030] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0031] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, this does not indicate any order, quantity, or importance, but is merely used to distinguish different components. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. Words such as “comprising” or “including” mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] An optical microcavity places the light-emitting region within a resonant cavity composed of a total reflection film and a semi-reflective film. Since the thickness of an organic light-emitting device (OLED) can be comparable to the wavelength of light, a semi-transparent composite cathode can serve as a semi-reflective film, and the anode as a total reflection film, giving the OLED a microcavity effect. By designing different resonant wavelengths, emission of different color wavelengths can be obtained. In related technologies, the microcavity construction of red, blue, and green OLEDs is achieved through the patterning of at least three film layers. Specifically, the microcavity construction is achieved through the patterning of film layers such as the anode, hole transport layer, and light-emitting layer. Thus, on the one hand, in the process of fabricating three-color light-emitting devices, the anode, hole transport layer, and light-emitting layer need to be patterned separately, resulting in more patterning steps and increasing the manufacturing cost; on the other hand, after constructing the microcavities of red, blue, and green light-emitting devices, the thickness of the hole transport layer of the blue light-emitting device cannot be reduced and cannot be compensated for by the hole injection layer, while the thickness of the red light-emitting device usually corresponds to the thickness of the blue light-emitting device, resulting in a thicker hole transport layer in the red light-emitting device, which leads to a higher voltage in the red light-emitting device.

[0034] In view of at least one of the above problems, embodiments of this application provide a display panel and a method for manufacturing the same, as well as a display device. In the process of manufacturing the first light-emitting element, the second light-emitting element, and the third light-emitting element, the difference in film thickness between different color light-emitting elements can be controlled by using a smaller number of film layers, thereby helping to reduce the number of exposures of the film layers and reduce manufacturing costs.

[0035] In a first aspect, referring to FIG1, an embodiment of this application provides a display panel 10, which may be an organic light-emitting diode (OLED) display or a quantum dot light-emitting diode (QLED) display.

[0036] The display panel 10 includes a substrate 11, a first light-emitting element 12a, a second light-emitting element 12b, and a third light-emitting element 12c. The first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are all disposed on one side of the substrate 11. The wavelength of the light emitted by the first light-emitting element 12a is shorter than the wavelength of the light emitted by the second light-emitting element 12b, and the wavelength of the light emitted by the second light-emitting element 12b is shorter than the wavelength of the light emitted by the third light-emitting element 12c.

[0037] Specifically, the microcavity order of the first light-emitting element 12a is greater than or equal to 3, the microcavity order of the first light-emitting element 12a is greater than the microcavity order of the second light-emitting element 12b, and the microcavity order of the first light-emitting element 12a is greater than the microcavity order of the third light-emitting element 12c. The thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are subtracted pairwise, and the largest difference among these three differences is less than a first preset value. That is, the largest absolute value among the absolute values ​​of the pairwise differences in the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c is less than the first preset value.

[0038] Here, the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c can be one of a red light-emitting element, a green light-emitting element, and a blue light-emitting element, respectively. Of course, in some other embodiments, the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c can also be light-emitting devices that emit light of other colors besides red, green, and blue, such as white or yellow. This application embodiment does not limit this.

[0039] It should be noted that the total optical thickness of the light-emitting element and the emission wavelength of the microcavity satisfy the following relationship:

[0040] Where L is the total optical path of the microcavity, θij is the sum of the phase shifts of the light at the anode and cathode reflecting surfaces, ni and dj are the refractive index and thickness of the organic layer, respectively, m is the order of the emission mode, and λm is the wavelength of the mode with order m. From the above formula, it can be seen that the total cavity length L of the microcavity structure can be adjusted by changing the thickness d of the organic layer, and the cavity length L corresponds to the emission mode m (similar to the microcavity order in this paper) and peak value λm of the light-emitting element. That is, the microcavity order of the light-emitting element is related to the thickness of the light-emitting element.

[0041] This embodiment of the application adjusts the microcavity order of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c, such that the microcavity order of the first light-emitting element 12a is greater than or equal to 3, the microcavity order of the first light-emitting element 12a is greater than the microcavity order of the second light-emitting element 12b, and the microcavity order of the first light-emitting element 12a is greater than the microcavity order of the third light-emitting element 12c, thereby further reducing the maximum thickness difference among the three light-emitting elements to a first preset value. It should be noted that the microcavity order is a positive integer.

[0042] Understandably, when the maximum thickness difference decreases, the required compensation thickness also decreases, allowing for compensation to be achieved with a smaller number of film layers. Thus, during the fabrication of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c, the thickness difference between different colored light-emitting elements can be controlled using a smaller number of film layers. This necessitates patterning only a smaller number of film layers, thereby reducing the number of exposures and lowering manufacturing costs.

[0043] In some embodiments, the first preset value is less than 160 nm. For example, the first preset value can be 150 nm, 140 nm, 130 nm, 110 nm, 100 nm, 90 nm, 80 nm, 60 nm, etc. This allows for a smaller maximum thickness difference, thus requiring only a smaller number of film layers for patterning, which helps reduce the number of exposures and lower manufacturing costs.

[0044] In some embodiments, the first preset value is less than 100nm. For example, the first preset value can be 95nm, 90nm, 85nm, 80nm, 60nm, etc.

[0045] This can further reduce the maximum thickness difference, thus requiring only a smaller number of film layers to be patterned, which in turn helps to reduce the number of exposures of the film layers and lower the manufacturing cost.

[0046] In some embodiments, the first preset value is less than 80nm. For example, the first preset value can be 78nm, 75nm, 70nm, 68nm, 65nm, 62nm, etc.

[0047] In this way, the maximum thickness difference can be minimized, so only a small number of film layers need to be patterned, which helps to reduce the number of exposures of the film layers and reduce production costs.

[0048] In some embodiments, the minimum absolute value of the absolute values ​​of the pairwise differences between the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c is less than a second preset value. That is, the minimum difference among the three differences is less than the second preset value. Thus, in the process of manufacturing the two light-emitting elements that form the minimum difference, only a smaller number of film layers need to be patterned, which helps to reduce the number of exposures to the film layers and lower manufacturing costs.

[0049] In some embodiments, the second preset value is less than 80nm. For example, the second preset value can be 78nm, 75nm, 70nm, 60nm, 50nm, 40nm, 30nm, etc. In this way, in the process of fabricating two light-emitting elements that form the minimum difference, only a small number of film layers need to be patterned, which helps to reduce the number of exposures of the film layers and reduce the manufacturing cost.

[0050] In some embodiments, the second preset value is less than 60nm. For example, the second preset value can be 58nm, 55nm, 50nm, 45nm, 43nm, 39nm, 35nm, 30nm, etc. In this way, the minimum thickness difference can be further reduced.

[0051] In some embodiments, the second preset value is less than 40nm. For example, the second preset value can be 39nm, 38nm, 36nm, 35nm, 33nm, 30nm, 28nm, 25nm, etc. In this way, the minimum thickness difference can be further reduced.

[0052] Here, taking the minimum thickness difference between the first light-emitting element 12a and the second light-emitting element 12b as an example, by making the minimum difference less than 40nm, the thickness that needs to be compensated between the first light-emitting element 12a and the second light-emitting element 12b can be less than 40nm. Therefore, thickness compensation can be achieved through a single film layer (such as a light-emitting layer). Specifically, the thickness difference between the light-emitting layer (first light-emitting layer 12a3) of the first light-emitting element 12a and the light-emitting layer (second light-emitting layer 12b3) of the second light-emitting element 12b is equal to the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b. In this way, there is no need to pattern other film layers of the first light-emitting element 12a and the second light-emitting element 12b to achieve total thickness compensation, reducing the number of film layer exposures and lowering manufacturing costs.

[0053] In some embodiments, the wavelength of light emitted by the first light-emitting element 12a is between 440nm and 480nm; the wavelength of light emitted by the second light-emitting element 12b is between 505nm and 545nm; and the wavelength of light emitted by the third light-emitting element 12c is between 600nm and 650nm.

[0054] Thus, the first light-emitting element 12a is a blue light-emitting element, the second light-emitting element 12b is a green light-emitting element, and the third light-emitting element 12c is a red light-emitting element. In this embodiment, the microcavity order of the blue, red, and green light-emitting elements is adjusted so that the microcavity order of the blue light-emitting element is greater than or equal to 3, greater than that of the green light-emitting element, and greater than that of the red light-emitting element. This further ensures that the maximum thickness difference between the three light-emitting elements is less than a first preset value. Therefore, during the fabrication of the blue, green, and red light-emitting elements, the thickness difference between the different colored light-emitting elements can be controlled using a smaller number of film layers. This requires only a smaller number of film layers for patterning, thereby reducing the number of exposures and lowering manufacturing costs.

[0055] In some embodiments, the microcavity order of the second light-emitting element 12b is equal to that of the third light-emitting element 12c.

[0056] This makes it easier to ensure that the maximum thickness difference of the three light-emitting components is less than the first preset value and the minimum thickness difference is less than the second preset value.

[0057] It should be noted that the higher the microcavity order of the light-emitting element, the lower its efficiency and the higher its manufacturing cost. The above configuration, while meeting the thickness adjustment requirements of the second light-emitting element 12b and the third light-emitting element 12c, helps to reduce the microcavity order of the second light-emitting element 12b and the third light-emitting element 12c, thereby improving their efficiency and reducing their manufacturing cost.

[0058] Referring to Figures 2, 3, and 4, the figures show the median thicknesses (intermediate values ​​of thickness ranges) of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c at different microcavity orders. The median thicknesses of the first light-emitting element 12a at 2nd, 3rd, 4th, 5th, 6th, and 7th order microcavities are 205 nm, 325 nm, 455 nm, 585 nm, 705 nm, and 835 nm, respectively. The median thicknesses of the second light-emitting element 12b at 2nd, 3rd, 4th, 5th, and 6th order microcavities are 250 nm, 400 nm, 550 nm, 690 nm, and 840 nm, respectively. The median thicknesses of the third light-emitting element 12c at 2nd, 3rd, 4th, and 5th order microcavities are 305 nm, 485 nm, 665 nm, and 845 nm, respectively.

[0059] In some embodiments, the microcavity order of the first light-emitting element 12a is 3, the microcavity order of the second light-emitting element 12b is 2, and the microcavity order of the third light-emitting element 12c is 2. In this case, the thickness of the first light-emitting element 12a is 325 nm, the thickness of the second light-emitting element 12b is 250 nm, and the thickness of the third light-emitting element 12c is 305 nm. Therefore, the maximum thickness difference is 325 nm - 250 nm = 75 nm, and the minimum thickness difference is 305 nm - 250 nm = 55 nm.

[0060] In a comparative example, the microcavity order of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c is all 2. In this case, the thickness of the second light-emitting element 12b is 205 nm, the thickness of the third light-emitting element 12c is 305 nm. Therefore, the maximum thickness difference is 305 nm - 205 nm = 100 nm, and the minimum thickness difference is 250 nm - 205 nm = 45 nm.

[0061] In another comparative example, the microcavity order of the first light-emitting element 12a and the second light-emitting element 12b is 2, and the microcavity order of the third light-emitting element 12c is 1. In this case, the thickness of the second light-emitting element 12b is 205 nm, the thickness of the third light-emitting element 12c is 125 nm, and the thickness of the third light-emitting element 12c is 125 nm. It can be seen that the maximum thickness difference is 250 nm - 125 nm = 125 nm, and the minimum thickness difference is 205 nm - 125 nm = 80 nm.

[0062] Comparative analysis revealed that the embodiment provided in this application exhibits the smallest maximum thickness difference (75nm). This allows for the control of film thickness differences between different color light-emitting elements using a smaller number of film layers (e.g., two or one layer), thus requiring only a smaller number of film layers (e.g., two or one layer) for patterning, thereby reducing the number of film layer exposures and lowering manufacturing costs.

[0063] In some embodiments, the microcavity order of the first light-emitting element 12a is 4, the microcavity order of the second light-emitting element 12b is 2, and the microcavity order of the third light-emitting element 12c is 2. The thickness of the first light-emitting element 12a is 455 nm, the thickness of the second light-emitting element 12b is 400 nm, and the thickness of the third light-emitting element 12c is 305 nm. The maximum thickness difference is 455 nm - 305 nm = 150 nm, and the minimum thickness difference is 400 nm - 305 nm = 95 nm.

[0064] In some embodiments, the microcavity order of the first light-emitting element 12a is 4, the microcavity order of the second light-emitting element 12b is 3, and the microcavity order of the third light-emitting element 12c is 3. The thickness of the first light-emitting element 12a is 455 nm, the thickness of the second light-emitting element 12b is 400 nm, and the thickness of the third light-emitting element 12c is 485 nm. The maximum thickness difference is 485 nm - 400 nm = 85 nm, and the minimum thickness difference is 455 nm - 400 nm = 55 nm.

[0065] In some embodiments, the microcavity order of the first light-emitting element 12a is 5, the microcavity order of the second light-emitting element 12b is 4, and the microcavity order of the third light-emitting element 12c is 4. The thickness of the first light-emitting element 12a is 585 nm, the thickness of the second light-emitting element 12b is 550 nm, and the thickness of the third light-emitting element 12c is 665 nm. The maximum thickness difference is 665 nm - 550 nm = 115 nm, and the minimum thickness difference is 585 nm - 550 nm = 35 nm.

[0066] In some embodiments, the microcavity order of the first light-emitting element 12a is 3, the microcavity order of the second light-emitting element 12b is 1, and the microcavity order of the third light-emitting element 12c is 1. It is understood that the microcavity orders of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c can also be other values, which are not listed one by one in the embodiments of this application.

[0067] It should be noted that the microcavity orders of the second light-emitting element 12b and the third light-emitting element 12c may not be equal. For example, the microcavity order of the second light-emitting element 12b may be 4, and the microcavity order of the third light-emitting element 12c may be 3; or the microcavity order of the second light-emitting element 12b may be 3, and the microcavity order of the third light-emitting element 12c may be 2; or the microcavity order of the second light-emitting element 12b may be 6, and the microcavity order of the third light-emitting element 12c may be 5. The embodiments of this application do not limit the microcavity orders of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c.

[0068] In some embodiments, the first light-emitting element 12a includes a first light-emitting layer 12a3 and functional layer groups respectively disposed above and below the first light-emitting layer 12a3, that is, functional layer groups are disposed on both the side of the first light-emitting layer 12a3 near the substrate 11 and the side away from the substrate 11. The second light-emitting element 12b includes a second light-emitting layer 12b3 and functional layer groups respectively disposed above and below the second light-emitting layer 12b3, that is, functional layer groups are disposed on both the side of the second light-emitting layer 12b3 near the substrate 11 and the side away from the substrate 11. The third light-emitting element 12c includes a third light-emitting layer 12c3 and functional layer groups respectively disposed above and below the third light-emitting layer 12c3, that is, functional layer groups are disposed on both the side of the third light-emitting layer 12c3 near the substrate 11 and the side away from the substrate 11.

[0069] The thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are subtracted pairwise. Any film layer in either functional layer group of the two light-emitting elements that forms the maximum difference is reused as a thickness adjustment film layer. The maximum difference is equal to the sum of the difference in the thickness of the light-emitting layers of the two light-emitting elements that forms the maximum difference and the difference in the thickness adjustment film layer thickness of the two light-emitting elements. That is, the absolute value of the thickness difference between the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c. Any film layer in either functional layer group of the two light-emitting elements that forms the maximum absolute value is reused as a thickness adjustment film layer. The maximum absolute value is equal to the sum of the absolute value of the difference in the thickness of the light-emitting layers of the two light-emitting elements that forms the maximum absolute value and the absolute value of the difference in the thickness adjustment film layer thickness of the two light-emitting elements.

[0070] It should be explained that the thickness adjustment film layer can be understood as a film layer that needs to be patterned. The thickness difference of the light-emitting elements is reflected through the thickness adjustment film layer. If the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b is the maximum difference (i.e., the maximum thickness difference), then the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b is reflected in the thickness difference of the thickness adjustment film layer of the first light-emitting element 12a and the thickness adjustment film layer of the second light-emitting element 12b. The thicknesses of other film layers of the first light-emitting element 12a and the second light-emitting element 12b are equal.

[0071] It should be noted that the functional layer groups located above the first light-emitting layer 12a3 (on the side of the first light-emitting layer 12a3 away from the substrate 11), the functional layer groups located above the second light-emitting layer 12b3 (on the side of the second light-emitting layer 12b3 away from the substrate 11), and the functional layer groups located above the third light-emitting layer 12c3 (on the side of the third light-emitting layer 12c3 away from the substrate 11) have the same function. The functional layer groups located below the first light-emitting layer 12a3 (on the side of the first light-emitting layer 12a3 close to the substrate 11), the functional layer groups located below the second light-emitting layer 12b3 (on the side of the second light-emitting layer 12b3 close to the substrate 11), and the functional layer groups located below the third light-emitting layer 12c3 (on the side of the third light-emitting layer 12c3 close to the substrate 11) have the same function.

[0072] Assuming that the functional layer group above the first light-emitting layer 12a3 (on the side of the first light-emitting layer 12a3 away from the substrate 11) includes three functional layers A, B, and C, then the functional layer group above the second light-emitting layer 12b3 (on the side of the second light-emitting layer 12b3 away from the substrate 11) also includes three functional layers A, B, and C, and the functional layer group above the third light-emitting layer 12c3 (on the side of the third light-emitting layer 12c3 away from the substrate 11) also includes three functional layers A, B, and C. Similarly, assuming that the functional layer group below the first light-emitting layer 12a3 (on the side of the first light-emitting layer 12a3 closer to the substrate 11) includes three functional layers E, F, and G, then the functional layer group below the second light-emitting layer 12b3 (on the side of the second light-emitting layer 12b3 closer to the substrate 11) also includes three functional layers E, F, and G, and the functional layer group below the third light-emitting layer 12c3 (on the side of the third light-emitting layer 12c3 closer to the substrate 11) also includes three functional layers E, F, and G.

[0073] Taking the maximum thickness difference between the first light-emitting element 12a and the second light-emitting element 12b as an example, at least one of the films A, B, C, D, E, and F in the first light-emitting element 12a and the second light-emitting element 12b is reused as a thickness adjustment film. In one example, the A film layer of the first light-emitting element 12a and the A film layer of the second light-emitting element 12b are reused as a thickness adjustment film. In another example, the A and B film layers of the first light-emitting element 12a and the A and B film layers of the second light-emitting element 12b are reused as a thickness adjustment film.

[0074] Thus, in the process of manufacturing the first light-emitting element 12a, the second light-emitting element 12b and the third light-emitting element 12c, the difference in film thickness between different color light-emitting elements can be controlled by using a smaller number of film layers (such as thickness adjustment film layers), which helps to reduce the number of exposures of the film layers and reduce manufacturing costs.

[0075] In some embodiments, the smallest of the three differences is equal to the difference in the thickness of the light-emitting layers of the two light-emitting elements that form the smallest difference. That is, the smallest absolute value of the absolute values ​​of the pairwise differences in the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c is equal to the absolute value of the difference in the thickness of the light-emitting layers of the two light-emitting elements that form the smallest absolute value. Here, taking the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b as the smallest difference as an example, the above setting is equivalent to compensating for the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b through the first light-emitting layer 12a3 and the second light-emitting layer 12b3. This eliminates the need for patterning other film layers of the first light-emitting element 12a and the second light-emitting element 12b to achieve thickness compensation, reducing the number of film layer exposures and lowering manufacturing costs.

[0076] In some embodiments, referring to FIG1, the first light-emitting element 12a includes a first electrode 12a1, a first functional layer group 12a2, a first light-emitting layer 12a3, a second functional layer group 12a4, and a second electrode 12a5 stacked along the direction away from the substrate 11; the second light-emitting element 12b includes a third electrode 12b1, a third functional layer group 12b2, a second light-emitting layer 12b3, a fourth functional layer group 12b4, and a fourth electrode 12b5 stacked along the direction away from the substrate 11; the third light-emitting element 12c includes a fifth electrode 12c1, a fifth functional layer group 12c2, a third light-emitting layer 12c3, a sixth functional layer group 12c4, and a sixth electrode 12c5 stacked along the direction away from the substrate 11. In a specific example, the first electrode 12a1, the third electrode 12b1, and the fifth electrode 12c1 are anodes, and the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are cathodes. It is understandable that the cathode and anode can also be opposite, such as the first electrode 12a1, the third electrode 12b1 and the fifth electrode 12c1 being the cathodes, and the second electrode 12a5, the fourth electrode 12b5 and the sixth electrode 12c5 being the anodes.

[0077] In some embodiments, the first functional layer group 12a2 includes a first hole injection layer 12a21, the third functional layer group 12b2 includes a second hole injection layer 12b21, and the fifth functional layer group 12c2 includes a third hole injection layer 12c21. If the absolute value of the difference in thickness between the first light-emitting element 12a and the second light-emitting element 12b is the maximum absolute value, then the first hole injection layer 12a21 and the second hole injection layer 12b21 are reused as a thickness adjustment film layer; if the absolute value of the difference in thickness between the first light-emitting element 12a and the third light-emitting element 12c is the maximum absolute value, then the first hole injection layer 12a21 and the third hole injection layer 12c21 are reused as a thickness adjustment film layer; if the absolute value of the difference in thickness between the second light-emitting element 12b and the third light-emitting element 12c is the maximum absolute value, then the second hole injection layer 12b21 and the third hole injection layer 12c21 are reused as a thickness adjustment film layer.

[0078] In some embodiments, as shown in FIG8, the thickness of the first hole injection layer 12a21 is twice that of the second hole injection layer 12b21, and the thickness of the third hole injection layer 12c21 is twice that of the second hole injection layer 12b21. Thus, during the fabrication of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c, the hole injection material layer is patterned to compensate for thickness, thereby reducing the number of exposures of the film layer and lowering the manufacturing cost.

[0079] In some embodiments, the second functional layer group 12a4, the fourth functional layer group 12b4, and the sixth functional layer group 12c4 are common film layers. That is, the second functional layer group 12a4, the fourth functional layer group 12b4, and the sixth functional layer group 12c4 have the same thickness, and the materials of the second functional layer group 12a4, the fourth functional layer group 12b4, and the sixth functional layer group 12c4 are the same. This helps to reduce manufacturing costs.

[0080] It is understood that other layers in the first functional layer group 12a2, the third functional layer group 12b2, and the fifth functional layer group 12c2 can also be reused as thickness adjustment layers. Alternatively, any layer in the second functional layer group 12a4, the fourth functional layer group 12b4, and the sixth functional layer group 12c4 can be reused as a thickness adjustment layer.

[0081] In some embodiments, the first electrode 12a1, the third electrode 12b1, and the fifth electrode 12c1 have equal thicknesses.

[0082] In some embodiments, the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are common film layers, that is, the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are integral surface electrodes, and the thickness and material of the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are the same.

[0083] In some embodiments, the first light-emitting layer 12a3, the second light-emitting layer 12b3, and the third light-emitting layer 12c3 are arranged at intervals; the first electrode 12a1, the third electrode 12b1, and the fifth electrode 12c1 are arranged at intervals; and the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 can be connected to each other.

[0084] In some embodiments, the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are subtracted from each other.

[0085] If the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b is the largest of the three differences, then the first electrode 12a1 and the third electrode 12b1 are reused as a thickness adjustment film layer. If the thickness difference between the first light-emitting element 12a and the third light-emitting element 12c is the largest of the three differences, then the first electrode 12a1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer. If the thickness difference between the second light-emitting element 12b and the third light-emitting element 12c is the largest of the three differences, then the third electrode 12b1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer. That is, among the absolute values ​​of the pairwise differences in the thickness of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c; if the absolute value of the difference in the thickness of the first light-emitting element 12a and the second light-emitting element 12b is the largest absolute value, then the first electrode 12a1 and the third electrode 12b1 are reused as a thickness adjustment film layer; if the absolute value of the difference in the thickness of the first light-emitting element 12a and the third light-emitting element 12c is the largest absolute value, then the first electrode 12a1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer; if the absolute value of the difference in the thickness of the second light-emitting element 12b and the third light-emitting element 12c is the largest absolute value, then the third electrode 12b1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer.

[0086] In this way, it is equivalent to reusing the anodes of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c as a thickness adjustment film layer.

[0087] Specifically, the maximum difference is equal to the sum of the difference in the thickness of the light-emitting layers of the two light-emitting elements that form the maximum difference and the difference in the thickness adjustment film layer of the two light-emitting elements. Or, the maximum absolute value is equal to the sum of the absolute value of the difference in the thickness of the light-emitting layers of the two light-emitting elements that form the maximum absolute value and the absolute value of the difference in the thickness adjustment film layer of the two light-emitting elements.

[0088] In this way, it is equivalent to patterning the light-emitting layer and the anode to make the light-emitting layer and the anode of each light-emitting element have different thicknesses, and distributing the total thickness difference of each light-emitting element to the light-emitting layer and the anode. This eliminates the need to pattern other film layers of the light-emitting element, reduces the number of exposures of the film layers, and lowers the manufacturing cost.

[0089] It should be noted that patterning is only performed on the light-emitting layer and the anode, and not on the functional layers of the functional layer group. This helps to reduce the adverse effects of adjusting the thickness of the functional layers on the luminous efficiency, thereby ensuring the performance of the light-emitting component.

[0090] In some embodiments, the first functional layer group 12a2, the third functional layer group 12b2, and the fifth functional layer group 12c2 are common film layers, meaning that they have the same thickness and material. Thus, during the fabrication of the light-emitting element, there is no need to pattern the first functional layer group 12a2, the third functional layer group 12b2, and the fifth functional layer group 12c2, which helps reduce the number of exposures to the film layers and lowers manufacturing costs.

[0091] In some embodiments, the second functional layer group 12a4, the fourth functional layer group 12b4, and the sixth functional layer group 12c4 are common film layers, meaning that they have the same thickness and material. Thus, during the fabrication of the light-emitting element, there is no need to pattern the second functional layer group 12a4, the fourth functional layer group 12b4, and the sixth functional layer group 12c4, which helps to reduce the number of exposures to the film layers and lowers manufacturing costs.

[0092] In some embodiments, the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are common films, meaning that they have the same thickness and material. This allows the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 to be fabricated in the same process, reducing manufacturing costs.

[0093] In some embodiments, referring to FIG1, the first electrode 12a1 includes a first reflective electrode 12a11 and a first transparent electrode 12a12 stacked along the direction away from the substrate 11, the third electrode 12b1 includes a second reflective electrode 12b11 and a second transparent electrode 12b12 stacked along the direction away from the substrate 11, and the fifth electrode 12c1 includes a third reflective electrode 12c11 and a third transparent electrode 12c12 stacked along the direction away from the substrate 11.

[0094] If the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b is the largest of the three differences, then the first transparent electrode 12a12 and the second transparent electrode 12b12 are reused as a thickness adjustment film layer; if the thickness difference between the first light-emitting element 12a and the third light-emitting element 12c is the largest of the three differences, then the first transparent electrode 12a12 and the third transparent electrode 12c12 are reused as a thickness adjustment film layer; if the thickness difference between the second light-emitting element 12b and the third light-emitting element 12c is the largest of the three differences, then the second transparent electrode 12b12 and the third transparent electrode 12c12 are reused as a thickness adjustment film layer. That is: if the absolute value of the difference in thickness between the first light-emitting element 12a and the second light-emitting element 12b is the maximum absolute value, then the first transparent electrode 12a12 and the second transparent electrode 12b12 are reused as a thickness adjustment film layer; if the absolute value of the difference in thickness between the first light-emitting element 12a and the third light-emitting element 12c is the maximum absolute value, then the first transparent electrode 12a12 and the third transparent electrode 12c12 are reused as a thickness adjustment film layer; if the absolute value of the difference in thickness between the second light-emitting element 12b and the third light-emitting element 12c is the maximum absolute value, then the second transparent electrode 12b12 and the third transparent electrode 12c12 are reused as a thickness adjustment film layer.

[0095] In this way, the transparent electrode of the anode is reused as a thickness adjustment film layer. Thus, during the fabrication of the light-emitting component, the transparent electrodes (such as the first transparent electrode 12a12, the second transparent electrode 12b12, and the third transparent electrode 12c12) are patterned to create differences in the thickness of the first transparent electrode 12a12, the second transparent electrode 12b12, and the third transparent electrode 12c12.

[0096] In some embodiments, the thickness of the first transparent electrode 12a12 is greater than the thickness of the second transparent electrode 12b12. The thickness of the third transparent electrode 12c12 is greater than the thickness of the second transparent electrode 12b12. This allows the thicknesses of the first transparent electrode 12a12, the second transparent electrode 12b12, and the third transparent electrode 12c12 to be adapted to the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c. This enables the use of fewer film layers to control the thickness differences between different colored light-emitting elements, thereby reducing the number of exposures and lowering manufacturing costs.

[0097] In some embodiments, the thickness of the first transparent electrode 12a12 is twice the thickness of the second transparent electrode 12b12, and the thickness of the third transparent electrode 12c12 is twice the thickness of the second transparent electrode 12b12. This allows the thicknesses of the first transparent electrode 12a12, the second transparent electrode 12b12, and the third transparent electrode 12c12 to be adapted to the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c. This enables the use of fewer film layers to control the thickness differences between different colored light-emitting elements, thereby reducing the number of exposures and lowering manufacturing costs.

[0098] In some embodiments, the thickness of the first transparent electrode 12a12 is between 100nm and 120nm. For example, the thickness of the first transparent electrode 12a12 can be 100nm, 105nm, 110nm, 115nm, 120nm, or between any two of the above values.

[0099] In some embodiments, the thickness of the second transparent electrode 12b12 is between 50 nm and 60 nm. For example, the thickness of the second transparent electrode 12b12 can be 50 nm, 53 nm, 55 nm, 58 nm, 60 nm, or between any two of the above values.

[0100] In some embodiments, the thickness of the third transparent electrode 12c12 is between 100nm and 120nm. For example, the thickness of the third transparent electrode 12c12 can be 100nm, 105nm, 110nm, 115nm, 120nm, or between any two of the above values.

[0101] By ensuring the thicknesses of the first transparent electrode 12a12, the second transparent electrode 12b12, and the third transparent electrode 12c12 meet the aforementioned conditions, their thicknesses can be adapted to the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c. This allows for the use of fewer film layers to control the thickness differences between different colored light-emitting elements, thereby reducing the number of film exposures and lowering manufacturing costs. Furthermore, a transparent electrode film thickness of approximately 55 nm can typically be fabricated in a single film deposition process. The aforementioned configuration allows the second transparent electrode 12b12 to be fabricated in a single process, and the first transparent electrode 12a12 and the third transparent electrode 12c12 to be fabricated in two separate processes, thus minimizing the number of film depositions and further reducing manufacturing costs.

[0102] In some embodiments, the first transparent electrode 12a12, the second transparent electrode 12b12, and the third transparent electrode 12c12 are made of metal oxide.

[0103] In some embodiments, the materials of the first transparent electrode 12a12, the second transparent electrode 12b12, and the third transparent electrode 12c12 include at least one of indium tin oxide, indium zinc oxide, indium zinc tin oxide, aluminum zinc oxide, and gallium zinc oxide.

[0104] In some embodiments, the materials of the first reflective electrode 12a11, the second reflective electrode 12b11, and the third reflective electrode 12c11 include at least one of silver, aluminum, and titanium.

[0105] It should be noted here that the total cavity length of the first light-emitting element 12a is the optical thickness from the surface of the first reflective electrode 12a11 away from the substrate 11 to the surface of the second electrode 12a5 away from the substrate 11. The total cavity length of the second light-emitting element 12b is the optical thickness from the surface of the second reflective electrode 12b11 away from the substrate 11 to the surface of the fourth electrode 12b5 away from the substrate 11. The total cavity length of the third light-emitting element 12c is the optical thickness from the surface of the third reflective electrode 12c11 away from the substrate 11 to the surface of the fourth electrode 12b5 away from the substrate 11.

[0106] In one specific embodiment, the first transparent electrode 12a12, the second transparent electrode 12b12 and the third transparent electrode 12c12 are made of indium tin oxide, and the first reflective electrode 12a11, the second reflective electrode 12b11 and the third reflective electrode 12c11 are made of silver.

[0107] In some embodiments, the thickness of the first reflective electrode 12a11 is between 50 nm and 1000 nm. Exemplarily, the thickness of the first reflective electrode 12a11 can be 50 nm, 100 nm, 180 nm, 260 nm, 370 nm, 480 nm, 560 nm, 670 nm, 780 nm, 860 nm, 1000 nm, or between any two of the above values. This configuration, on the one hand, gives the first reflective electrode 12a11 better reflectivity, and on the other hand, helps to reduce the thickness of the first electrode 12a1.

[0108] In some embodiments, the thickness of the second reflective electrode 12b11 is between 50 nm and 1000 nm. The thickness of the second reflective electrode 12b11 can be 50 nm, 100 nm, 170 nm, 260 nm, 300 nm, 370 nm, 480 nm, 560 nm, 670 nm, 780 nm, 900 nm, 1000 nm, or between any two of the above values. This configuration, on the one hand, gives the second reflective electrode 12b11 better reflectivity, and on the other hand, helps to reduce the thickness of the second electrode 12a5.

[0109] In some embodiments, the thickness of the third reflective electrode 12c11 is between 50 nm and 1000 nm. The thickness of the third reflective electrode 12c11 can be 50 nm, 90 nm, 170 nm, 260 nm, 300 nm, 360 nm, 480 nm, 570 nm, 700 nm, 780 nm, 920 nm, 1000 nm, or between any two of the above values. This configuration, on the one hand, gives the third reflective electrode 12c11 better reflectivity, and on the other hand, helps to reduce the thickness of the third electrode 12b1.

[0110] In some embodiments, the materials of the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 include at least one of magnesium and silver.

[0111] In some embodiments, the thickness of the second electrode 12a5 is between 5 nm and 40 nm. Exemplarily, the thickness of the second electrode 12a5 can be 5 nm, 15 nm, 20 nm, 25 nm, 30 nm, 38 nm, 40 nm, or between any two of these values. This configuration allows the second electrode 12a5 to have both low resistance and good light transmittance.

[0112] In some embodiments, the thickness of the fourth electrode 12b5 is between 5 nm and 40 nm. Exemplarily, the thickness of the fourth electrode 12b5 can be 5 nm, 15 nm, 20 nm, 25 nm, 30 nm, 38 nm, 40 nm, or between any two of these values. This configuration allows the fourth electrode 12b5 to have both low resistance and good light transmittance.

[0113] In some embodiments, the thickness of the sixth electrode 12c5 is between 5 nm and 40 nm. Exemplarily, the thickness of the sixth electrode 12c5 can be 5 nm, 15 nm, 20 nm, 25 nm, 30 nm, 38 nm, 40 nm, or between any two of these values. This configuration allows the sixth electrode 12c5 to have both low resistance and good light transmittance.

[0114] In some embodiments, the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are common films, and the thicknesses of the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are equal.

[0115] In some embodiments, the first electrode 12a1 further includes a fourth transparent electrode 12a13 disposed between the first reflective electrode 12a11 and the substrate 11; the third electrode 12b1 further includes a fifth transparent electrode 12b13 disposed between the second reflective electrode 12b11 and the substrate 11; and the fifth electrode 12c1 further includes a sixth transparent electrode 12c13 disposed between the third reflective electrode 12c11 and the substrate 11.

[0116] In some embodiments, the fourth transparent electrode 12a13, the fifth transparent electrode 12b13, and the sixth transparent electrode 12c13 are made of metal oxide.

[0117] In some embodiments, the materials of the fourth transparent electrode 12a13, the fifth transparent electrode 12b13, and the sixth transparent electrode 12c13 include at least one of indium tin oxide, indium zinc oxide, indium zinc tin oxide, aluminum zinc oxide, and gallium zinc oxide.

[0118] In one specific embodiment, the fourth transparent electrode 12a13, the fifth transparent electrode 12b13, and the sixth transparent electrode 12c13 are made of silver.

[0119] In some embodiments, the fourth transparent electrode 12a13, the fifth transparent electrode 12b13, and the sixth transparent electrode 12c13 have the same thickness.

[0120] In some embodiments, the thickness of the fourth transparent electrode 12a13 is between 1 nm and 60 nm. Exemplarily, the thickness of the fourth transparent electrode 12a13 can be 1 nm, 10 nm, 19 nm, 28 nm, 36 nm, 50 nm, 56 nm, 60 nm, or between any two of the above values.

[0121] In some embodiments, the thickness of the fifth transparent electrode 12b13 is between 1 nm and 60 nm. For example, the thickness of the fifth transparent electrode 12b13 can be 1 nm, 10 nm, 19 nm, 28 nm, 36 nm, 50 nm, 56 nm, 60 nm, or between any two of the above values.

[0122] In some embodiments, the thickness of the sixth transparent electrode 12c13 is between 1 nm and 60 nm. For example, the thickness of the sixth transparent electrode 12c13 can be 1 nm, 10 nm, 19 nm, 28 nm, 36 nm, 50 nm, 56 nm, 60 nm, or between any two of the above values.

[0123] In some embodiments, the thickness of the first light-emitting layer 12a3 is between 25 nm and 45 nm. Exemplarily, the thickness of the first light-emitting layer 12a3 can be 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, or between any two of the above values. By keeping the thickness of the first light-emitting layer 12a3 within the above range, it is advantageous to make the first light-emitting element 12a have higher efficiency and a longer lifespan.

[0124] In some embodiments, the thickness of the first light-emitting layer 12a3 is between 25 nm and 40 nm. The inventors of this application conducted experiments on the maximum efficiency and lifetime of the first light-emitting layer 12a3 at different thicknesses. Specific experimental data are shown in the table below. Figure 5 shows the external quantum efficiency versus current density curves of the first light-emitting layer 12a3 at different thicknesses, and Figure 6 shows the brightness versus time curves of the first light-emitting layer 12a3 at different thicknesses. In Figures 5 and 6, curve a represents a 27 nm first light-emitting layer 12a3, curve b represents a 35 nm first light-emitting layer 12a3, and curve c represents a 17 nm first light-emitting layer 12a3.

[0125] As can be seen from the table above, the efficiency and lifetime of the 35nm and 27nm first emitting layers 12a3 are significantly better than those of the 17nm first emitting layer 12a3. Figure 5 shows that at current densities less than 10mA / cm²... 2 Under these conditions, the external quantum efficiency of the first emitting layer 12a3 at 35nm and 27nm is better. As can be seen from Figure 6, the brightness of the first emitting layer 12a3 at 35nm and 27nm is higher. In summary, the thickness of the first emitting layer 12a3 between 25nm and 40nm can give the first emitting element 12a better luminous performance, better luminous efficiency, and longer lifespan.

[0126] In some embodiments, the thickness of the first light-emitting layer 12a3 is greater than the thickness of the second light-emitting layer 12b3. In this way, on the one hand, the first light-emitting element 12a and the second light-emitting element 12b can have better device performance; on the other hand, the thickness of the first light-emitting element 12a and the second light-emitting layer 12b3 can be compensated by patterning the first light-emitting layer 12a3 and the second light-emitting layer 12b3.

[0127] In some embodiments, the thickness of the first light-emitting layer 12a3 is greater than the thickness of the third light-emitting layer 12c3. In this way, on the one hand, the first light-emitting element 12a and the third light-emitting element 12c can have better device performance; on the other hand, the thickness of the first light-emitting element 12a and the third light-emitting layer 12c3 can be compensated by patterning the first light-emitting layer 12a3 and the third light-emitting layer 12c3.

[0128] In some embodiments, the thickness of the second light-emitting layer 12b3 is between 8 nm and 30 nm. For example, the thickness of the second light-emitting layer 12b3 can be 8 nm, 10 nm, 15 nm, 20 nm, 26 nm, 30 nm, or between any two of the above values.

[0129] In some embodiments, the thickness of the third light-emitting layer 12c3 is between 8 nm and 30 nm. For example, the thickness of the third light-emitting layer 12c3 can be 8 nm, 10 nm, 14 nm, 15 nm, 22 nm, 27 nm, 30 nm, or between any two of the above values.

[0130] In some embodiments, referring to FIG1, the first functional layer group 12a2 includes a first hole injection layer 12a21 and a first hole transport layer 12a22 stacked along the direction away from the substrate 11, and the second functional layer group 12a4 includes at least a first electron transport layer 12a41. The third functional layer group 12b2 includes a second hole injection layer 12b21 and a second hole transport layer 12b22 stacked along the direction away from the substrate 11, and the fourth functional layer group 12b4 includes at least a second electron transport layer 12b41. The fifth functional layer group 12c2 includes a third hole injection layer 12c21 and a third hole transport layer 12c22 stacked along the direction away from the substrate 11, and the sixth functional layer group 12c4 includes at least a third electron transport layer 12c41.

[0131] The above configuration is beneficial to improving the luminous efficiency and stability of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c.

[0132] In some embodiments, the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 are common membrane layers, meaning that they have the same thickness and material. Here, a common membrane layer can also be understood as a shared membrane layer. This helps reduce manufacturing costs.

[0133] In some embodiments, the thicknesses of the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 are between 10 nm and 100 nm. Exemplarily, the thicknesses of the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 can be 10 nm, 25 nm, 40 nm, 56 nm, 74 nm, 80 nm, 95 nm, 100 nm, or between any two of these values. By ensuring that the thicknesses of the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 are within the aforementioned range, it is beneficial to reduce the power consumption of the light-emitting device and improve brightness and efficiency.

[0134] In some embodiments, the thicknesses of the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 are between 80 nm and 100 nm. Exemplarily, the thicknesses of the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 can be 80 nm, 85 nm, 90 nm, 95 nm, 100 nm, or between any two of these values. By ensuring that the thicknesses of the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 are within the aforementioned range, it is beneficial to further reduce the power consumption and voltage of the light-emitting device.

[0135] In some embodiments, the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 are common film layers, meaning that they have the same thickness and material. This helps to reduce manufacturing costs.

[0136] In some embodiments, the thicknesses of the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 are between 10 nm and 100 nm. Exemplarily, the thicknesses of the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 can be 10 nm, 20 nm, 30 nm, 40 nm, 56 nm, 74 nm, 80 nm, 95 nm, 100 nm, or between any two of the above values. By ensuring that the thicknesses of the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 are within the above range, it is beneficial to improve the efficiency and stability of the light-emitting device.

[0137] In some embodiments, the thicknesses of the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 are between 10 nm and 40 nm. Exemplarily, the thicknesses of the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 can be 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, or between any two of these values. By ensuring that the thicknesses of the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 are within the aforementioned range, it is beneficial to further reduce the power consumption and voltage of the light-emitting device.

[0138] In some embodiments, the first electron transport layer 12a41, the second electron transport layer 12b41, and the third electron transport layer 12c41 are common films, meaning that they have the same thickness and material. This helps to reduce manufacturing costs.

[0139] In some embodiments, the thicknesses of the first electron transport layer 12a41, the second electron transport layer 12b41, and the third electron transport layer 12c41 are between 10 nm and 100 nm. Exemplarily, the thicknesses of the first electron transport layer 12a41, the second electron transport layer 12b41, and the third electron transport layer 12c41 can be 10 nm, 20 nm, 30 nm, 40 nm, 56 nm, 74 nm, 80 nm, 95 nm, 100 nm, or between any two of the above values. By ensuring that the thicknesses of the first electron transport layer 12a41, the second electron transport layer 12b41, and the third electron transport layer 12c41 are within the above ranges, the carrier injection rate and balance can be optimized, thereby improving the luminous efficiency and brightness of the light-emitting device.

[0140] In some embodiments, the materials of the first electron transport layer 12a41, the second electron transport layer 12b41, and the third electron transport layer 12c41 include at least one of ZnMgO, ZnO, ZnAlO, ZnLiO, SnO, SnMgO, SnAlO, and SnLiO.

[0141] In a preferred embodiment, the first electron transport layer 12a41, the second electron transport layer 12b41, and the third electron transport layer 12c41 are made of ZnMgO. Thus, compared to ZnAlO, ZnMgO can increase the band gap of the electron transport layer, reduce defects, and help reduce exciton quenching, thereby improving the efficiency and lifespan of the light-emitting device.

[0142] In some embodiments, referring to FIG1, the display panel 10 further includes a light extraction layer 13, which is disposed on the side of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c away from the substrate 11. In this way, the light extraction efficiency of the light-emitting elements can be improved.

[0143] In some embodiments, the thickness of the light extraction layer is between 50 nm and 90 nm. For example, the thickness of the light extraction layer can be 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, or between any two of these values. This benefits both by reducing the thickness of the display panel 10 and by improving the light extraction efficiency of the light-emitting element.

[0144] It should be noted that the thickness of each film layer involved in the embodiments of this application is the optical thickness.

[0145] In some embodiments, referring to FIG7, the second functional layer group 12a4 further includes a first electron injection layer 12a42 disposed between the first electron transport layer 12a41 and the second electrode 12a5. The fourth functional layer group 12b4 further includes a second electron injection layer (not shown) disposed between the second electron transport layer 12b41 and the fourth electrode 12b5, and the sixth functional layer group 12c4 further includes a third electron injection layer (not shown) disposed between the third electron transport layer 12c41 and the sixth electrode 12c5. This improves the electron injection efficiency of the light-emitting element, thereby improving the luminous efficiency and current efficiency of the light-emitting element.

[0146] In some embodiments, the first electron injection layer 12a42, the second electron injection layer, and the third electron injection layer are common films, meaning that they have the same thickness and material. This helps to reduce manufacturing costs.

[0147] In some embodiments, the thicknesses of the first hole injection layer 12a21, the second hole injection layer 12b21, and the third hole injection layer 12c21 are equal. The thicknesses of the first hole transport layer 12a22, the second hole transport layer 12b22, and the third hole transport layer 12c22 are equal. The thicknesses of the first electron transport layer 12a41, the second electron transport layer 12b41, and the third electron transport layer 12c41 are equal. Furthermore, only the light-emitting layers (first light-emitting layer 12a3, second light-emitting layer 12b3, third light-emitting layer 12c3) and the anode (first electrode 12a1, third electrode 12b1, fifth electrode 12c1) are patterned, eliminating the need for exposure (patterning) of other film layers, thereby reducing the number of film layer exposures and lowering manufacturing costs.

[0148] In some embodiments, the second functional layer group 12a4 further includes a first hole blocking layer 12a43 disposed between the first electron transport layer 12a41 and the first light-emitting layer 12a3; the fourth functional layer group 12b4 further includes a second hole blocking layer (not shown) disposed between the second electron transport layer 12b41 and the second light-emitting layer 12b3; and the sixth functional layer group 12c4 further includes a third hole blocking layer (not shown) disposed between the third electron transport layer 12c41 and the third light-emitting layer 12c3. This prevents holes from moving towards the cathode, reduces unnecessary current leakage, and improves the efficiency and stability of the light-emitting element.

[0149] In some embodiments, the first hole-blocking layer 12a43, the second hole-blocking layer, and the third hole-blocking layer are common film layers, meaning that they have the same thickness and material. This helps to reduce manufacturing costs.

[0150] In some embodiments, the first functional layer group 12a2 further includes a first electron blocking layer 12a23 disposed between the first hole transport layer 12a22 and the first light-emitting layer 12a3; the third functional layer group 12b2 further includes a second electron blocking layer (not shown) disposed between the second hole transport layer 12b22 and the second light-emitting layer 12b3; and the fifth functional layer group 12c2 further includes a third electron blocking layer (not shown) disposed between the third hole transport layer 12c22 and the third light-emitting layer 12c3. This prevents electrons from moving towards the anode, balances carrier injection, and improves the brightness and efficiency of the light-emitting element.

[0151] In some embodiments, the first electron blocking layer 12a23, the second electron blocking layer, and the third electron blocking layer are common film layers, meaning that they have the same thickness and material. This helps to reduce manufacturing costs.

[0152] Secondly, embodiments of this application provide a display panel 10, which includes a substrate 11, a first light-emitting element 12a, a second light-emitting element 12b, and a third light-emitting element 12c. A first light-emitting element 12a, a second light-emitting element 12b, and a third light-emitting element 12c are disposed on one side of a substrate 11; the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c emit different colors; the first light-emitting element 12a includes a first electrode 12a1, a first functional layer group 12a2, a first light-emitting layer 12a3, a second functional layer group 12a4, and a second electrode 12a5 stacked along the direction away from the substrate 11; the second light-emitting element 12b includes a third electrode 12b1, a third functional layer group 12b2, a second light-emitting layer 12b3, a fourth functional layer group 12b4, and a fourth electrode 12b5 stacked along the direction away from the substrate 11; the third light-emitting element 12c includes a fifth electrode 12c1, a fifth functional layer group 12c2, a third light-emitting layer 12c3, a sixth functional layer group 12c4, and a sixth electrode 12c5 stacked along the direction away from the substrate 11.

[0153] Among them, the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are subtracted from each other, and the smallest difference among the three differences is equal to the difference in the thickness of the light-emitting layer of the two light-emitting elements that form the smallest difference.

[0154] If the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b is the largest of the three differences, then the first electrode 12a1 and the third electrode 12b1 are reused as a thickness adjustment film layer; or, any film layer in any functional layer group of the two functional layer groups of the first light-emitting element 12a and the second light-emitting element 12b is reused as a thickness adjustment film layer; if the thickness difference between the first light-emitting element 12a and the third light-emitting element 12c is the largest of the three differences, then the first electrode 12a1 and the fifth electrode 12c1 are reused as... A thickness adjustment film layer, or any film layer in either of the two functional layer groups of the first light-emitting element 12a and the third light-emitting element 12c is reused as a thickness adjustment film layer; if the difference in thickness between the second light-emitting element 12b and the third light-emitting element 12c is the largest of the three differences, then the third electrode 12b1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer, or any film layer in either of the two functional layer groups of the second light-emitting element 12b and the third light-emitting element 12c is reused as a thickness adjustment film layer;

[0155] The largest of the three differences is equal to the sum of the difference in the thickness of the light-emitting layer of the two light-emitting elements that form the largest difference and the difference in the thickness adjustment film layer.

[0156] That is: among the absolute values ​​of the pairwise differences in the thickness of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c, the minimum absolute value is equal to the absolute value of the difference in the thickness of the light-emitting layers of the two light-emitting elements that form the minimum absolute value; the maximum absolute value is equal to the sum of the absolute value of the difference in the thickness of the light-emitting layers of the two light-emitting elements that form the maximum absolute value and the absolute value of the difference in the thickness adjustment film layer; if the absolute value of the difference in the thickness of the first light-emitting element 12a and the second light-emitting element 12b is the maximum absolute value, then the first electrode 12a1 and the third electrode 12b1 are reused as a thickness adjustment film layer, or, any film layer in any functional layer group of the two functional layer groups of the first light-emitting element 12a and the second light-emitting element 12b is reused. The first electrode 12a1 and the fifth electrode 12c1 are reused as thickness adjustment film layers if the absolute value of the difference between the thicknesses of the first light-emitting element 12a and the third light-emitting element 12c is the maximum absolute value, or any film layer in either of the two functional layer groups of the first light-emitting element 12a and the third light-emitting element 12c is reused as a thickness adjustment film layer; if the absolute value of the difference between the thicknesses of the second light-emitting element 12b and the third light-emitting element 12c is the maximum absolute value, the third electrode 12b1 and the fifth electrode 12c1 are reused as thickness adjustment film layers, or any film layer in either of the two functional layer groups of the second light-emitting element 12b and the third light-emitting element 12c is reused as a thickness adjustment film layer.

[0157] The embodiments of this application are equivalent to controlling the film thickness difference between different color light-emitting elements by using a light-emitting layer and a thickness adjustment film layer. In this way, during the manufacturing process of the first light-emitting element 12a, the second light-emitting element 12b and the third light-emitting element 12c, the film thickness difference between different color light-emitting elements is controlled by using a smaller number of film layers, which helps to reduce the number of exposures of the film layers and reduce manufacturing costs.

[0158] Thirdly, referring to FIG9, this application embodiment provides a method for manufacturing a display panel 10, which specifically includes the following steps:

[0159] S100: Provides substrate 11.

[0160] S200: A first electrode 12a1, a third electrode 12b1, and a fifth electrode 12c1 are formed on one side of the substrate 11.

[0161] S300: A first functional layer group 12a2, a first light-emitting layer 12a3, a second functional layer group 12a4, and a second electrode 12a5 are stacked on the side of the first electrode 12a1 away from the substrate 11. A third functional layer group 12b2, a second light-emitting layer 12b3, a fourth functional layer group 12b4, and a fourth electrode 12b5 are stacked on the side of the third electrode 12b1 away from the substrate 11. A fifth functional layer group 12c2, a third light-emitting layer 12c3, a sixth functional layer group 12c4, and a sixth electrode 12c5 are stacked on the side of the fifth electrode 12c1 away from the substrate 11, so as to form a first light-emitting element 12a, a second light-emitting element 12b, and a third light-emitting element 12c with different light-emitting colors.

[0162] In this process, the thicknesses of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are subtracted from each other in pairs. The smallest difference among the three differences is the first value, and the largest difference among the three differences is the second value. If the difference in thickness between the first light-emitting element 12a and the second light-emitting element 12b is the largest difference among the three differences, then the first electrode 12a1 and the third electrode 12b1 are reused as a thickness adjustment film layer, or any film layer in any functional layer group of the two functional layer groups of the first light-emitting element 12a and the second light-emitting element 12b is reused as a thickness adjustment film layer. If the difference in thickness between the first light-emitting element 12a and the third light-emitting element 12c is the largest difference among the three differences, then the first electrode 12a1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer, or the thicknesses of the first light-emitting element 12a and the third light-emitting element 12c are reused as a thickness adjustment film layer. Any film layer in either of the two functional layer groups is reused as a thickness adjustment film layer; if the difference in thickness between the second light-emitting element 12b and the third light-emitting element 12c is the largest difference among the three differences, then the third electrode 12b1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer, or, any film layer in either of the two functional layer groups of the second light-emitting element 12b and the third light-emitting element 12c is reused as a thickness adjustment film layer; during the formation of the first light-emitting element 12a, the second light-emitting element 12b and the third light-emitting element 12c, the light-emitting layer and the thickness adjustment film layer are patterned so that the first value is equal to the difference in the thickness of the light-emitting layer of the two light-emitting elements that form the smallest difference, and the second value is equal to the sum of the difference in the thickness of the light-emitting layer of the two light-emitting elements that form the largest difference and the difference in the thickness adjustment film layer thickness of the two light-emitting elements.

[0163] That is: among the absolute values ​​of the pairwise differences in thickness of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c, the minimum absolute value is the first value, and the maximum absolute value is the second value; if the absolute value of the difference in thickness between the first light-emitting element 12a and the second light-emitting element 12b is the maximum absolute value, then the first electrode 12a1 and the third electrode 12b1 are reused as a thickness adjustment film layer, or any film layer in any functional layer group of the two functional layer groups of the first light-emitting element 12a and the second light-emitting element 12b is reused as a thickness adjustment film layer; if the absolute value of the difference in thickness between the first light-emitting element 12a and the third light-emitting element 12c is the maximum absolute value, then the first electrode 12a1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer, or any film layer in any functional layer group of the two functional layer groups of the first light-emitting element 12a and the third light-emitting element 12c is reused as a thickness adjustment film layer. Any film layer in the functional layer group is reused as a thickness adjustment film layer; if the absolute value of the difference in thickness between the second light-emitting element 12b and the third light-emitting element 12c is the maximum absolute value, then the third electrode 12b1 and the fifth electrode 12c1 are reused as a thickness adjustment film layer, or, any film layer in either of the two functional layer groups of the second light-emitting element 12b and the third light-emitting element 12c is reused as a thickness adjustment film layer; during the formation of the first light-emitting element 12a, the second light-emitting element 12b and the third light-emitting element 12c, the light-emitting layer and the thickness adjustment film layer are patterned so that the first value is equal to the absolute value of the difference in thickness between the two light-emitting elements forming the minimum absolute value, and the second value is equal to the sum of the absolute value of the difference in thickness between the two light-emitting elements forming the maximum absolute value and the absolute value of the difference in thickness adjustment film layer thickness between the two light-emitting elements.

[0164] The method for manufacturing the display panel 10 provided in this application embodiment involves patterning the light-emitting layer and the thickness adjustment film layer during the fabrication of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c. This allows for the use of fewer film layers to control the thickness difference between different color light-emitting elements, thereby reducing the number of exposures of the film layers and lowering the manufacturing cost.

[0165] In one example, assuming the thickness difference between the first light-emitting element 12a and the second light-emitting element 12b is the maximum difference, then the first electrode 12a1 and the second electrode 12a5 are reused as thickness adjustment films. During the fabrication of the first electrode 12a1, the second electrode 12a5, the first light-emitting layer 12a3, and the second light-emitting layer 12b3, the first electrode 12a1, the second electrode 12a5, the first light-emitting layer 12a3, and the second light-emitting layer 12b3 are patterned so that the sum of the thickness difference between the first electrode 12a1 and the second electrode 12a5 and the thickness difference between the first light-emitting layer 12a3 and the second light-emitting layer 12b3 equals the maximum difference. Further, assuming the thickness difference between the first light-emitting element 12a and the third light-emitting element 12c is the minimum difference. During the fabrication of the first light-emitting layer 12a3 and the second light-emitting layer 12b3, the first light-emitting layer 12a3 and the second light-emitting layer 12b3 are patterned respectively, so that the difference in thickness between the first light-emitting layer 12a3 and the second light-emitting layer 12b3 is equal to the difference in thickness between the first light-emitting element 12a and the second light-emitting element 12b.

[0166] Fourthly, as shown in Figure 10, this application embodiment provides a method for manufacturing a display panel, specifically including the following steps:

[0167] S10: Provide substrate 11.

[0168] S20: A first electrode material layer is formed on one side of the substrate 11.

[0169] S30: Pattern the first electrode material layer to form the first electrode 12a1, the third electrode 12b1 and the fifth electrode 12c1.

[0170] S40: A first functional layer group 12a2 electrically connected to the first electrode 12a1 is formed on the side of the first electrode 12a1 away from the substrate 11; a third functional layer group 12b2 electrically connected to the third electrode 12b1 is formed on the side of the third electrode 12b1 away from the substrate 11; and a fifth functional layer group 12c2 electrically connected to the fifth electrode 12c1 is formed on the side of the fifth electrode 12c1 away from the substrate 11.

[0171] S50: A first light-emitting material layer is formed on the side of the first functional layer group 12a2, the third functional layer group 12b2 and the fifth functional layer group 12c2 away from the substrate 11, and the first light-emitting material layer is patterned to form a first light-emitting layer 12a3, a second light-emitting layer 12b3 and a third light-emitting layer 12c3.

[0172] S60: A second functional layer group 12a4 electrically connected to the first light-emitting layer 12a3 is formed on the side of the first light-emitting layer 12a3 away from the substrate 11; a fourth functional layer group 12b4 electrically connected to the second light-emitting layer 12b3 is formed on the side of the second light-emitting layer 12b3 away from the substrate 11; and a sixth functional layer group 12c4 electrically connected to the third light-emitting layer 12c3 is formed on the side of the third light-emitting layer 12c3 away from the substrate 11.

[0173] S70: A second electrode material layer is formed on the side of the second functional layer group 12a4, the fourth functional layer group 12b4, and the sixth functional layer group 12c4 that is away from the substrate 11. That is, the second electrode 12a5, the fourth electrode 12b5, and the sixth electrode 12c5 are formed.

[0174] The method for preparing the display panel 10 provided in this application embodiment involves patterning the light-emitting layer and the material layer of the first electrode 12a1 during the fabrication of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c. This allows for the use of fewer film layers to control the film thickness difference between different color light-emitting elements, thereby reducing the number of exposures of the film layers and lowering the manufacturing cost.

[0175] Fifthly, referring to FIG11, an embodiment of this application provides a display device 1, including the display panel 10 in the first and second aspect embodiments.

[0176] The display device 1 can be a laptop computer, mobile phone, wireless device, personal digital assistant (PDA), handheld or portable computer, GPS receiver / navigator, camera, MP4 video player, camcorder, game console, watch, clock, calculator, TV monitor, flat panel display, computer monitor, car display (e.g., odometer display), navigator, cockpit controller and / or display, camera view display (e.g., display of a rearview camera in a vehicle), electronic photograph, electronic billboard or sign, projector, etc.

[0177] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0178] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0179] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display panel, characterized in that, include: substrate; A first light-emitting element, a second light-emitting element, and a third light-emitting element are disposed on one side of the substrate; the wavelength of the light emitted by the first light-emitting element is less than the wavelength of the light emitted by the second light-emitting element, and the wavelength of the light emitted by the second light-emitting element is less than the wavelength of the light emitted by the third light-emitting element. Wherein, the microcavity order of the first light-emitting element is greater than or equal to 3, the microcavity order of the first light-emitting element is greater than the microcavity order of the second light-emitting element, and the microcavity order of the first light-emitting element is greater than the microcavity order of the third light-emitting element. The maximum absolute value of the absolute values ​​of the differences between the thicknesses of the first light-emitting element, the second light-emitting element, and the third light-emitting element is less than a first preset value.

2. The display panel according to claim 1, characterized in that, The first preset value is less than 160nm; Optionally, the first preset value is less than 100 nm; Optionally, the first preset value is less than 80nm; Optionally, the minimum absolute value of the absolute values ​​of the pairwise differences between the thickness of the first light-emitting element, the thickness of the second light-emitting element, and the thickness of the third light-emitting element is less than a second preset value. Optionally, the second preset value is less than 80nm; Optionally, the second preset value is less than 60nm; Optionally, the second preset value is less than 40nm.

3. The display panel according to claim 1 or 2, characterized in that, The wavelength of light emitted by the first light-emitting element is between 440nm and 480nm; the wavelength of light emitted by the second light-emitting element is between 505nm and 545nm; and the wavelength of light emitted by the third light-emitting element is between 600nm and 650nm. Optionally, the microcavity order of the second light-emitting element is equal to that of the third light-emitting element; Optionally, the microcavity order of the first light-emitting element is 3, the microcavity order of the second light-emitting element is 2, and the microcavity order of the third light-emitting element is 2. Optionally, the microcavity order of the first light-emitting element is 4, the microcavity order of the second light-emitting element is 2, and the microcavity order of the third light-emitting element is 2. Optionally, the microcavity order of the first light-emitting element is 4, the microcavity order of the second light-emitting element is 3, and the microcavity order of the third light-emitting element is 3. Optionally, the microcavity order of the first light-emitting element is 3, the microcavity order of the second light-emitting element is 1, and the microcavity order of the third light-emitting element is 1.

4. The display panel according to any one of claims 1-3, characterized in that, The first light-emitting element includes a first light-emitting layer and functional layer groups respectively disposed above and below the first light-emitting layer; the second light-emitting element includes a second light-emitting layer and functional layer groups respectively disposed above and below the second light-emitting layer; the third light-emitting element includes a third light-emitting layer and functional layer groups respectively disposed above and below the third light-emitting layer. Among the absolute values ​​of the pairwise differences between the thicknesses of the first light-emitting element, the second light-emitting element, and the third light-emitting element, any film layer in any functional layer group of the two light-emitting elements that forms the largest absolute value is reused as a thickness adjustment film layer; the largest absolute value is equal to the sum of the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the largest absolute value and the absolute value of the difference between the thickness adjustment film layers of the two light-emitting elements; Optionally, the minimum absolute value of the absolute values ​​of the pairwise differences between the thickness of the first light-emitting element, the thickness of the second light-emitting element, and the thickness of the third light-emitting element is equal to the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the minimum absolute value. Optionally, the first light-emitting element includes a first electrode, a first functional layer group, a first light-emitting layer, a second functional layer group, and a second electrode stacked along a direction away from the substrate; the second light-emitting element includes a third electrode, a third functional layer group, a second light-emitting layer, a fourth functional layer group, and a fourth electrode stacked along a direction away from the substrate; the third light-emitting element includes a fifth electrode, a fifth functional layer group, the third light-emitting layer, a sixth functional layer group, and a sixth electrode stacked along a direction away from the substrate. Optionally, the first functional layer group includes a first hole injection layer, the third functional layer group includes a second hole injection layer, and the fifth functional layer group includes a third hole injection layer. If the absolute value of the thickness difference between the first light-emitting element and the second light-emitting element is the maximum absolute value, then the first hole injection layer and the second hole injection layer are reused as the thickness adjustment film layer; if the absolute value of the thickness difference between the first light-emitting element and the third light-emitting element is the maximum absolute value, then the first hole injection layer and the third hole injection layer are reused as the thickness adjustment film layer; if the absolute value of the thickness difference between the second light-emitting element and the third light-emitting element is the maximum absolute value, then the second hole injection layer and the third hole injection layer are reused as the thickness adjustment film layer. Optionally, the thickness of the first hole injection layer is twice that of the second hole injection layer; Optionally, the thickness of the third hole injection layer is twice that of the second hole injection layer; Optionally, the second functional layer group, the fourth functional layer group, and the sixth functional layer group have the same thickness, and the second functional layer group, the fourth functional layer group, and the sixth functional layer group are made of the same material; Optionally, the thickness of the first electrode, the third electrode, and the fifth electrode are equal; Optionally, the second electrode, the fourth electrode, and the sixth electrode have the same thickness, and the second electrode, the fourth electrode, and the sixth electrode are made of the same material; Optionally, the thickness of the second electrode, the fourth electrode, and the sixth electrode is between 5 nm and 40 nm.

5. The display panel according to any one of claims 1-3, characterized in that, The first light-emitting element includes a first electrode, a first functional layer group, a first light-emitting layer, a second functional layer group, and a second electrode stacked along a direction away from the substrate; the second light-emitting element includes a third electrode, a third functional layer group, a second light-emitting layer, a fourth functional layer group, and a fourth electrode stacked along a direction away from the substrate; the third light-emitting element includes a fifth electrode, a fifth functional layer group, a third light-emitting layer, a sixth functional layer group, and a sixth electrode stacked along a direction away from the substrate. The absolute values ​​of the pairwise differences between the thickness of the first light-emitting element, the thickness of the second light-emitting element, and the thickness of the third light-emitting element; If the absolute value of the thickness difference between the first light-emitting element and the second light-emitting element is the maximum absolute value, then the first electrode and the third electrode are reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the first light-emitting element and the third light-emitting element is the maximum absolute value, then the first electrode and the fifth electrode are reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the second light-emitting element and the third light-emitting element is the maximum absolute value, then the third electrode and the fifth electrode are reused as a thickness adjustment film layer. The maximum absolute value is equal to the sum of the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the maximum absolute value and the absolute value of the difference between the thicknesses of the thickness adjustment film layers of the two light-emitting elements; Optionally, the minimum absolute value of the absolute values ​​of the pairwise differences between the thickness of the first light-emitting element, the thickness of the second light-emitting element, and the thickness of the third light-emitting element is equal to the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the minimum absolute value. Optionally, the first functional layer group, the third functional layer group, and the fifth functional layer group have the same thickness, and the first functional layer group, the third functional layer group, and the fifth functional layer group are made of the same material; Optionally, the second functional layer group, the fourth functional layer group, and the sixth functional layer group have the same thickness, and the second functional layer group, the fourth functional layer group, and the sixth functional layer group are made of the same material; Optionally, the second electrode, the fourth electrode, and the sixth electrode have the same thickness, and the second electrode, the fourth electrode, and the sixth electrode are made of the same material; Optionally, the thickness of the second electrode, the fourth electrode, and the sixth electrode is between 5 nm and 40 nm.

6. The display panel according to claim 5, characterized in that, The first electrode includes a first reflective electrode and a first transparent electrode stacked along a direction away from the substrate; the third electrode includes a second reflective electrode and a second transparent electrode stacked along a direction away from the substrate; and the fifth electrode includes a third reflective electrode and a third transparent electrode stacked along a direction away from the substrate. If the absolute value of the thickness difference between the first light-emitting element and the second light-emitting element is the maximum absolute value, then the first transparent electrode and the second transparent electrode are reused as the thickness adjustment film layer; if the absolute value of the thickness difference between the first light-emitting element and the third light-emitting element is the maximum absolute value, then the first transparent electrode and the third transparent electrode are reused as the thickness adjustment film layer; if the absolute value of the thickness difference between the second light-emitting element and the third light-emitting element is the maximum absolute value, then the second transparent electrode and the third transparent electrode are reused as the thickness adjustment film layer. Optionally, the thickness of the first transparent electrode is greater than the thickness of the second transparent electrode; Optionally, the thickness of the first transparent electrode is twice the thickness of the second transparent electrode; Optionally, the thickness of the third transparent electrode is greater than the thickness of the second transparent electrode; Optionally, the thickness of the third transparent electrode is twice the thickness of the second transparent electrode; Optionally, the thickness of the first transparent electrode is between 100 nm and 120 nm; Optionally, the thickness of the second transparent electrode is between 50 nm and 60 nm; Optionally, the thickness of the third transparent electrode is between 100 nm and 120 nm; Optionally, the materials of the first transparent electrode, the second transparent electrode, and the third transparent electrode include metal oxides; Optionally, the materials of the first transparent electrode, the second transparent electrode, and the third transparent electrode include at least one of indium tin oxide, indium zinc oxide, indium zinc tin oxide, aluminum zinc oxide, and gallium zinc oxide; Optionally, the materials of the first reflective electrode, the second reflective electrode, and the third reflective electrode include at least one of silver, aluminum, and titanium; Optionally, the thickness of the first reflective electrode is between 50 nm and 1000 nm; Optionally, the thickness of the second reflective electrode is between 50 nm and 1000 nm; Optionally, the thickness of the third reflective electrode is between 50 nm and 1000 nm; Optionally, the second electrode, the fourth electrode, and the sixth electrode may be made of at least one of magnesium and silver.

7. The display panel according to claim 6, characterized in that, The first electrode further includes a fourth transparent electrode disposed between the first reflective electrode and the substrate; the third electrode further includes a fifth transparent electrode disposed between the second reflective electrode and the substrate; the fifth electrode further includes a sixth transparent electrode disposed between the third reflective electrode and the substrate; Optionally, the materials of the fourth transparent electrode, the fifth transparent electrode, and the sixth transparent electrode include metal oxides; Optionally, the materials of the fourth transparent electrode, the fifth transparent electrode, and the sixth transparent electrode include at least one of indium tin oxide, indium zinc oxide, indium zinc tin oxide, aluminum zinc oxide, and gallium zinc oxide; Optionally, the thickness of the fourth transparent electrode is between 1 nm and 60 nm; Optionally, the thickness of the fifth transparent electrode is between 1 nm and 60 nm; Optionally, the thickness of the sixth transparent electrode is between 1 nm and 60 nm; Optionally, the fourth transparent electrode, the fifth transparent electrode, and the sixth transparent electrode have the same thickness.

8. The display panel according to any one of claims 4-7, characterized in that, The thickness of the first light-emitting layer is between 25nm and 45nm; Optionally, the thickness of the first light-emitting layer is greater than the thickness of the second light-emitting layer; Optionally, the thickness of the first light-emitting layer is greater than the thickness of the third light-emitting layer; Optionally, the thickness of the second light-emitting layer is between 8 nm and 30 nm; Optionally, the thickness of the third light-emitting layer is between 8 nm and 30 nm.

9. The display panel according to any one of claims 4-8, characterized in that, The first functional layer group includes a first hole injection layer and a first hole transport layer stacked along a direction away from the substrate; the second functional layer group includes at least a first electron transport layer; the third functional layer group includes a second hole injection layer and a second hole transport layer stacked along a direction away from the substrate; the fourth functional layer group includes at least a second electron transport layer; the fifth functional layer group includes a third hole injection layer and a third hole transport layer stacked along a direction away from the substrate; and the sixth functional layer group includes at least a third electron transport layer. Optionally, the first hole injection layer, the second hole injection layer, and the third hole injection layer have the same thickness, and the first hole injection layer, the second hole injection layer, and the third hole injection layer are made of the same material; Optionally, the thicknesses of the first hole injection layer, the second hole injection layer, and the third hole injection layer are between 10 nm and 100 nm. Optionally, the thicknesses of the first hole injection layer, the second hole injection layer, and the third hole injection layer are between 80 nm and 100 nm. Optionally, the first hole transport layer, the second hole transport layer, and the third hole transport layer have the same thickness, and the first hole transport layer, the second hole transport layer, and the third hole transport layer are made of the same material. Optionally, the thicknesses of the first hole transport layer, the second hole transport layer, and the third hole transport layer are between 10 nm and 100 nm. Optionally, the thicknesses of the first hole transport layer, the second hole transport layer, and the third hole transport layer are between 10 nm and 40 nm. Optionally, the first electron transport layer, the second electron transport layer, and the third electron transport layer have the same thickness, and the first electron transport layer, the second electron transport layer, and the third electron transport layer are made of the same material; Optionally, the thicknesses of the first electron transport layer, the second electron transport layer, and the third electron transport layer are between 10 nm and 100 nm. Optionally, the materials of the first electron transport layer, the second electron transport layer and the third electron transport layer include at least one of ZnMgO, ZnO, ZnAlO, ZnLiO, SnO, SnMgO, SnAlO and SnLiO; Optionally, the display panel further includes a light extraction layer, which is disposed on the side of the first light-emitting element, the second light-emitting element and the third light-emitting element away from the substrate; Optionally, the thickness of the light extraction layer is between 50 nm and 90 nm.

10. The display panel according to claim 9, characterized in that, The second functional layer group further includes a first electron injection layer disposed between the first electron transport layer and the second electrode; the fourth functional layer group further includes a second electron injection layer disposed between the second electron transport layer and the fourth electrode; and the sixth functional layer group further includes a third electron injection layer disposed between the third electron transport layer and the sixth electrode. Optionally, the first electron injection layer, the second electron injection layer, and the third electron injection layer have the same thickness, and the first electron injection layer, the second electron injection layer, and the third electron injection layer are made of the same material; Optionally, the second functional layer group further includes a first hole blocking layer disposed between the first electron transport layer and the first light-emitting layer, the fourth functional layer group further includes a second hole blocking layer disposed between the second electron transport layer and the second light-emitting layer, and the sixth functional layer group further includes a third hole blocking layer disposed between the third electron transport layer and the third light-emitting layer. Optionally, the first hole blocking layer, the second hole blocking layer, and the third hole blocking layer have the same thickness, and the first hole blocking layer, the second hole blocking layer, and the third hole blocking layer are made of the same material. Optionally, the first functional layer group further includes a first electron blocking layer disposed between the first hole transport layer and the first light-emitting layer, the third functional layer group further includes a second electron blocking layer disposed between the second hole transport layer and the second light-emitting layer, and the fifth functional layer group further includes a third electron blocking layer disposed between the third hole transport layer and the third light-emitting layer. Optionally, the first electron blocking layer, the second electron blocking layer, and the third electron blocking layer have the same thickness, and the first electron blocking layer, the second electron blocking layer, and the third electron blocking layer are made of the same material.

11. A display panel, characterized in that, include: substrate; A first light-emitting element, a second light-emitting element, and a third light-emitting element are disposed on one side of the substrate; the first light-emitting element, the second light-emitting element, and the third light-emitting element emit different colors; the first light-emitting element includes a first electrode, a first functional layer group, a first light-emitting layer, a second functional layer group, and a second electrode stacked along the direction away from the substrate; the second light-emitting element includes a third electrode, a third functional layer group, a second light-emitting layer, a fourth functional layer group, and a fourth electrode stacked along the direction away from the substrate; the third light-emitting element includes a fifth electrode, a fifth functional layer group, a third light-emitting layer, a sixth functional layer group, and a sixth electrode stacked along the direction away from the substrate; Among the absolute values ​​of the pairwise differences between the thickness of the first light-emitting element, the thickness of the second light-emitting element, and the thickness of the third light-emitting element, the minimum absolute value is equal to the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the minimum absolute value; the maximum absolute value is equal to the sum of the absolute value of the difference between the thicknesses of the light-emitting layers of the two light-emitting elements that form the maximum absolute value and the absolute value of the difference between the thicknesses of the thickness adjustment film layer. If the absolute value of the thickness difference between the first light-emitting element and the second light-emitting element is the maximum absolute value, then the first electrode and the third electrode are reused as a thickness adjustment film layer, or any film layer in any functional layer group of the two functional layer groups of the first light-emitting element and the second light-emitting element is reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the first light-emitting element and the third light-emitting element is the maximum absolute value, then the first electrode and the fifth electrode are reused as a thickness adjustment film layer, or any film layer in any functional layer group of the two functional layer groups of the first light-emitting element and the third light-emitting element is reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the second light-emitting element and the third light-emitting element is the maximum absolute value, then the third electrode and the fifth electrode are reused as a thickness adjustment film layer, or any film layer in any functional layer group of the two functional layer groups of the second light-emitting element and the third light-emitting element is reused as a thickness adjustment film layer.

12. The display panel according to claim 11, characterized in that, The maximum absolute value is less than the first preset value; Optionally, the first preset value is less than 160nm; Optionally, the first preset value is less than 100 nm; Optionally, the first preset value is less than 80nm; Optionally, the minimum absolute value of the absolute values ​​of the pairwise differences between the thickness of the first light-emitting element, the thickness of the second light-emitting element, and the thickness of the third light-emitting element is less than a second preset value. Optionally, the second preset value is less than 80nm; Optionally, the second preset value is less than 60nm; Optionally, the second preset value is less than 40nm.

13. The display panel according to claim 11 or 12, characterized in that, The wavelength of light emitted by the first light-emitting element is between 440nm and 480nm; the wavelength of light emitted by the second light-emitting element is between 505nm and 545nm; and the wavelength of light emitted by the third light-emitting element is between 600nm and 650nm. The microcavity order of the first light-emitting element is greater than or equal to 3; the microcavity order of the first light-emitting element is greater than the microcavity order of the second light-emitting element, and the microcavity order of the first light-emitting element is greater than the microcavity order of the third light-emitting element. Optionally, the microcavity order of the second light-emitting element is equal to that of the third light-emitting element; Optionally, the microcavity order of the first light-emitting element is 3, the microcavity order of the second light-emitting element is 2, and the microcavity order of the third light-emitting element is 2. Optionally, the microcavity order of the first light-emitting element is 4, the microcavity order of the second light-emitting element is 2, and the microcavity order of the third light-emitting element is 2. Optionally, the microcavity order of the first light-emitting element is 4, the microcavity order of the second light-emitting element is 3, and the microcavity order of the third light-emitting element is 3. Optionally, the microcavity order of the first light-emitting element is 3, the microcavity order of the second light-emitting element is 1, and the microcavity order of the third light-emitting element is 1.

14. The display panel according to claim 13, characterized in that, The thickness of the first light-emitting layer is between 25nm and 45nm; Optionally, the thickness of the first light-emitting layer is greater than the thickness of the second light-emitting layer; Optionally, the thickness of the first light-emitting layer is greater than the thickness of the third light-emitting layer; Optionally, the thickness of the second light-emitting layer is between 8 nm and 30 nm; Optionally, the thickness of the third light-emitting layer is between 8 nm and 30 nm.

15. The display panel according to any one of claims 11-14, characterized in that, The first electrode includes a first reflective electrode and a first transparent electrode stacked along a direction away from the substrate; the third electrode includes a second reflective electrode and a second transparent electrode stacked along a direction away from the substrate; and the fifth electrode includes a third reflective electrode and a third transparent electrode stacked along a direction away from the substrate. If the absolute value of the thickness difference between the first light-emitting element and the second light-emitting element is the maximum absolute value, then the first transparent electrode and the second transparent electrode are reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the first light-emitting element and the third light-emitting element is the maximum absolute value, then the first transparent electrode and the third transparent electrode are reused as a thickness adjustment film layer; if the absolute value of the thickness difference between the second light-emitting element and the third light-emitting element is the maximum absolute value, then the second transparent electrode and the third transparent electrode are reused as a thickness adjustment film layer. Optionally, the thickness of the first transparent electrode is greater than the thickness of the second transparent electrode; Optionally, the thickness of the first transparent electrode is twice the thickness of the second transparent electrode; Optionally, the thickness of the third transparent electrode is greater than the thickness of the second transparent electrode; Optionally, the thickness of the third transparent electrode is twice the thickness of the second transparent electrode; Optionally, the thickness of the first transparent electrode is between 100 nm and 120 nm; Optionally, the thickness of the second transparent electrode is between 50 nm and 60 nm; Optionally, the thickness of the third transparent electrode is between 100 nm and 120 nm; Optionally, the materials of the first transparent electrode, the second transparent electrode, and the third transparent electrode include metal oxides; Optionally, the materials of the first transparent electrode, the second transparent electrode, and the third transparent electrode include at least one of indium tin oxide, indium zinc oxide, indium zinc tin oxide, aluminum zinc oxide, and gallium zinc oxide; Optionally, the materials of the first reflective electrode, the second reflective electrode, and the third reflective electrode include at least one of silver, aluminum, and titanium; Optionally, the thickness of the first reflective electrode is between 50 nm and 1000 nm; Optionally, the thickness of the second reflective electrode is between 50 nm and 1000 nm; Optionally, the thickness of the third reflective electrode is between 50 nm and 1000 nm; Optionally, the second electrode, the fourth electrode, and the sixth electrode may be made of at least one of magnesium and silver.

16. The display panel according to claim 15, characterized in that, The first electrode further includes a fourth transparent electrode disposed between the first reflective electrode and the substrate; the third electrode further includes a fifth transparent electrode disposed between the second reflective electrode and the substrate; the fifth electrode further includes a sixth transparent electrode disposed between the third reflective electrode and the substrate; Optionally, the materials of the fourth transparent electrode, the fifth transparent electrode, and the sixth transparent electrode include metal oxides; Optionally, the materials of the fourth transparent electrode, the fifth transparent electrode, and the sixth transparent electrode include at least one of indium tin oxide, indium zinc oxide, indium zinc tin oxide, aluminum zinc oxide, and gallium zinc oxide; Optionally, the thickness of the fourth transparent electrode is between 1 nm and 60 nm; Optionally, the thickness of the fifth transparent electrode is between 1 nm and 60 nm; Optionally, the thickness of the sixth transparent electrode is between 1 nm and 60 nm; Optionally, the fourth transparent electrode, the fifth transparent electrode, and the sixth transparent electrode have the same thickness.

17. The display panel according to any one of claims 11-16, characterized in that, The first functional layer group includes a first hole injection layer and a first hole transport layer stacked along a direction away from the substrate; the second functional layer group includes at least a first electron transport layer; the third functional layer group includes a second hole injection layer and a second hole transport layer stacked along a direction away from the substrate; the fourth functional layer group includes at least a second electron transport layer; the fifth functional layer group includes a third hole injection layer and a third hole transport layer stacked along a direction away from the substrate; and the sixth functional layer group includes at least a third electron transport layer. Optionally, the first hole injection layer, the second hole injection layer, and the third hole injection layer have the same thickness, and the first hole injection layer, the second hole injection layer, and the third hole injection layer are made of the same material; Optionally, the thicknesses of the first hole injection layer, the second hole injection layer, and the third hole injection layer are between 10 nm and 100 nm. Optionally, the thicknesses of the first hole injection layer, the second hole injection layer, and the third hole injection layer are between 80 nm and 100 nm. Optionally, the first hole transport layer, the second hole transport layer, and the third hole transport layer have the same thickness, and the first hole transport layer, the second hole transport layer, and the third hole transport layer are made of the same material. Optionally, the thicknesses of the first hole transport layer, the second hole transport layer, and the third hole transport layer are between 10 nm and 100 nm. Optionally, the thicknesses of the first hole transport layer, the second hole transport layer, and the third hole transport layer are between 10 nm and 40 nm. Optionally, the first electron transport layer, the second electron transport layer, and the third electron transport layer have the same thickness, and the first electron transport layer, the second electron transport layer, and the third electron transport layer are made of the same material; Optionally, the thicknesses of the first electron transport layer, the second electron transport layer, and the third electron transport layer are between 10 nm and 100 nm. Optionally, the materials of the first electron transport layer, the second electron transport layer and the third electron transport layer include at least one of ZnMgO, ZnO, ZnAlO, ZnLiO, SnO, SnMgO, SnAlO and SnLiO; Optionally, the display panel further includes a light extraction layer, which is disposed on the side of the first light-emitting element, the second light-emitting element and the third light-emitting element away from the substrate; Optionally, the thickness of the light extraction layer is between 50 nm and 90 nm; Optionally, the first functional layer group, the third functional layer group, and the fifth functional layer group have the same thickness, and the first functional layer group, the third functional layer group, and the fifth functional layer group are made of the same material; Optionally, the second functional layer group, the fourth functional layer group, and the sixth functional layer group have the same thickness, and the second functional layer group, the fourth functional layer group, and the sixth functional layer group are made of the same material; Optionally, the second electrode, the fourth electrode, and the sixth electrode have the same thickness, and the second electrode, the fourth electrode, and the sixth electrode are made of the same material; Optionally, the thickness of the second electrode, the fourth electrode, and the sixth electrode is between 5 nm and 40 nm.

18. The display panel according to claim 17, characterized in that, The second functional layer group further includes a first electron injection layer disposed between the first electron transport layer and the second electrode; the fourth functional layer group further includes a second electron injection layer disposed between the second electron transport layer and the fourth electrode; and the sixth functional layer group further includes a third electron injection layer disposed between the third electron transport layer and the sixth electrode. Optionally, the first electron injection layer, the second electron injection layer, and the third electron injection layer have the same thickness, and the first electron injection layer, the second electron injection layer, and the third electron injection layer are made of the same material; Optionally, the second functional layer group further includes a first hole blocking layer disposed between the first electron transport layer and the first light-emitting layer, the fourth functional layer group further includes a second hole blocking layer disposed between the second electron transport layer and the second light-emitting layer, and the sixth functional layer group further includes a third hole blocking layer disposed between the third electron transport layer and the third light-emitting layer. Optionally, the first hole blocking layer, the second hole blocking layer, and the third hole blocking layer have the same thickness, and the first hole blocking layer, the second hole blocking layer, and the third hole blocking layer are made of the same material. Optionally, the first functional layer group further includes a first electron blocking layer disposed between the first hole transport layer and the first light-emitting layer, the third functional layer group further includes a second electron blocking layer disposed between the second hole transport layer and the second light-emitting layer, and the fifth functional layer group further includes a third electron blocking layer disposed between the third hole transport layer and the third light-emitting layer. Optionally, the first electron blocking layer, the second electron blocking layer, and the third electron blocking layer have the same thickness, and the first electron blocking layer, the second electron blocking layer, and the third electron blocking layer are made of the same material.

19. A display device, characterized in that, Includes the display panel as described in any one of claims 1-18.

Images