Display panel and display apparatus

Abstract

The present application provides a display panel and a display apparatus. The display panel comprises an array substrate and a light-emitting device layer. The light-emitting device layer comprises a first light-emitting device and a second light-emitting device. The first light-emitting device is a single-emission-layer light-emitting device. By configuring the first light-emitting device as a single-emission-layer light-emitting device and the second light-emitting device as a stacked light-emitting device, the high emission efficiency of the display panel can be improved, and the uniformity of chromaticity and luminance can be enhanced.

Description

Display panel and display device

[0001] This application claims priority to Chinese patent application No. 202510220615.3, filed on February 26, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0003] With the development of flat panel display technology, the requirements for the stability of display panels are gradually increasing. In recent years, organic light-emitting diode (OLED) display panels have developed rapidly worldwide, and OLED display technology has also become increasingly sophisticated. Invention Overview

[0004] With advancements in OLED display technology and process improvements, the application areas of OLED displays are gradually expanding to medium and large sizes. In the medium and large-size OLED display field, the stability requirements for display panels are even higher, especially in terms of lifespan and temperature stability. Under these circumstances, the demand for multilayer OLED devices is increasing, and major display manufacturers are investing heavily in technology and product development. Although multilayer OLED devices have significant advantages in luminous efficiency and lifespan, the nearly doubling of luminous efficiency makes current control more difficult at low brightness levels, leading to a decrease in color and brightness uniformity of the display panel and resulting in poor display performance.

[0005] Therefore, it is necessary to provide a display panel and display device to improve this deficiency.

[0006] In a first aspect, embodiments of this application provide a display panel, including an array substrate;

[0007] A light-emitting device layer is disposed on the array substrate. The light-emitting device layer includes a first light-emitting device and a second light-emitting device. The first light-emitting device and the second light-emitting device emit different colors. The forward voltage of the first light-emitting device is less than the forward voltage of the second light-emitting device.

[0008] The first light-emitting device is a single-emitting-layer light-emitting device, which includes a first light-emitting layer. The second light-emitting device includes a second light-emitting layer, a third light-emitting layer, and a cathode layer. The third light-emitting layer is disposed above the second light-emitting layer, and the cathode layer is disposed on the side of the third light-emitting layer away from the second light-emitting layer. The number of microcavity resonant nodes in the first light-emitting layer is the same as the number of microcavity resonant nodes in the third light-emitting layer.

[0009] Secondly, embodiments of this application also provide a display device, including the display panel as described above. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments disclosed. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 is a schematic diagram of the structure of the display panel provided in an embodiment of this application;

[0012] Figure 2 is a schematic diagram of the microcavity resonance of the second light-emitting device in the display panel provided in the embodiment of this application;

[0013] Figure 3 is a schematic diagram of the structure of the display device provided in an embodiment of this application.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Array substrate;

[0016] 2. Light-emitting device layer; 201. Anode layer; 202. Cathode layer; 203. Hole injection layer; 204. First hole transport layer; 205. Second hole blocking layer; 206. Second electron transport layer; 207. Electron injection layer; 21. First light-emitting device; 21a. First sub-light-emitting device; 21b. Second sub-light-emitting device; 211. First light-emitting layer; 212. Second hole transport layer; 213. First electron blocking layer; 22. Second light-emitting device; 221. Second light-emitting layer; 222. Third light-emitting layer; 223. Charge generation layer; 2231. N-type charge generation layer; 2232. P-type charge generation layer; 224. Second electron blocking layer; 225. First hole blocking layer; 226. First electron transport layer; 227. Third hole transport layer; 228. Third electron blocking layer;

[0017] 100, Display panel; 200, Housing; 1000, Display device. Embodiments of the present invention

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "upper," "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Reference numerals and / or reference letters may be repeated in different embodiments of this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed.

[0021] The embodiments of this application provide a display panel and a display device that can improve the uniformity of color and brightness of the display panel.

[0022] To achieve the above objectives, according to a first aspect of this application, a display panel is provided, including an array substrate;

[0023] A light-emitting device layer is disposed on the array substrate. The light-emitting device layer includes a first light-emitting device and a second light-emitting device. The first light-emitting device and the second light-emitting device emit different colors. The forward voltage of the first light-emitting device is less than the forward voltage of the second light-emitting device.

[0024] The first light-emitting device is a single-emitting-layer light-emitting device, which includes a first light-emitting layer. The second light-emitting device includes a second light-emitting layer, a third light-emitting layer, and a cathode layer. The third light-emitting layer is disposed above the second light-emitting layer, and the cathode layer is disposed on the side of the third light-emitting layer away from the second light-emitting layer. The number of microcavity resonant nodes in the first light-emitting layer is the same as the number of microcavity resonant nodes in the third light-emitting layer.

[0025] Optionally, the number of microcavity resonant nodes in the second light-emitting layer is less than the number of microcavity resonant nodes in the third light-emitting layer.

[0026] Optionally, the number of microcavity resonant nodes in the second light-emitting layer is less than or equal to 2, and the number of microcavity resonant nodes in the third light-emitting layer is less than or equal to 3.

[0027] Optionally, the second light-emitting device further includes a charge-generating layer disposed between the second light-emitting layer and the third light-emitting layer.

[0028] Optionally, the orthographic projection of the charge generation layer on the array substrate is separated from the orthographic projection of the first light-emitting layer on the array substrate.

[0029] Optionally, the charge generation layer includes:

[0030] An N-type charge generation layer is disposed between the second light-emitting layer and the third light-emitting layer, wherein the N-type charge generation layer is configured to provide electrons to the second light-emitting layer;

[0031] A P-type charge generation layer is disposed between the N-type charge generation layer and the third light-emitting layer, wherein the P-type charge generation layer is configured to provide holes to the third light-emitting layer.

[0032] Optionally, the light-emitting device layer includes an anode layer, a hole injection layer, and a first hole transport layer stacked on the array substrate, wherein the first light-emitting device and the second light-emitting device share the first hole transport layer;

[0033] The first light-emitting device further includes a second hole transport layer, which is disposed on the surface of the first hole transport layer away from the array substrate, and the first light-emitting layer is disposed on the second hole transport layer.

[0034] Optionally, the second light-emitting device further includes a third hole transport layer, which is disposed between the second light-emitting layer and the third light-emitting layer, and the thickness of the third hole transport layer is less than the thickness of the second hole transport layer.

[0035] Optionally, the first light-emitting layer is configured to emit red or green light, and the second and third light-emitting layers are configured to emit blue light.

[0036] According to a second aspect of this application, a display device is provided, including a display panel as described above.

[0037] In the display panel of this application embodiment, by setting the first light-emitting device with a smaller forward voltage as a single-emitting-layer light-emitting device, the operating current of the first light-emitting device under low brightness is increased, avoiding the decrease in color and brightness uniformity caused by insufficient current control accuracy under low brightness due to excessively high luminous efficiency. The second light-emitting device with a larger forward voltage is set as a stacked light-emitting device with a second light-emitting layer and a third light-emitting layer, so that the number of microcavity resonant nodes of the first light-emitting layer is the same as the number of microcavity resonant nodes of the third light-emitting layer, thereby reducing the operating current of the second light-emitting device. This can improve the luminous efficiency of the second light-emitting device, thereby improving the color and brightness uniformity of the display panel while improving the luminous efficiency of the display panel.

[0038] An embodiment of this application provides a display panel, which includes an array substrate and a light-emitting device layer. The light-emitting device layer is disposed on the array substrate and includes a first light-emitting device and a second light-emitting device. The first light-emitting device and the second light-emitting device emit different colors. The forward voltage of the first light-emitting device is less than that of the second light-emitting device. The first light-emitting device includes a first light-emitting layer. The second light-emitting device includes a second light-emitting layer, a third light-emitting layer, and a cathode layer. The third light-emitting layer is disposed on the second light-emitting layer. The cathode layer is disposed on the side of the third light-emitting layer away from the second light-emitting layer. The number of microcavity resonant nodes in the first light-emitting layer is the same as the number of microcavity resonant nodes in the third light-emitting layer.

[0039] In the embodiments of this application, by setting the first light-emitting device with a smaller forward voltage as a single-layer light-emitting device with only one first light-emitting layer, the operating current of the first light-emitting device under low brightness is increased, avoiding the decrease in color and brightness uniformity caused by insufficient current control accuracy under low brightness due to excessively high luminous efficiency. The second light-emitting device with a larger forward voltage is set as a stacked light-emitting device with a second light-emitting layer and a third light-emitting layer, so that the number of microcavity resonant nodes of the first light-emitting layer is the same as the number of microcavity resonant nodes of the third light-emitting layer, thereby reducing the operating current of the second light-emitting device. This can improve the luminous efficiency of the second light-emitting device, thereby improving the color and brightness uniformity of the display panel while improving the luminous efficiency of the display panel.

[0040] Please refer to Figure 1. Figure 1 is a schematic diagram of the structure of a display panel provided in an embodiment of this application. The display panel includes an array substrate 1 and a light-emitting device layer 2, which is disposed on the array substrate 1.

[0041] In some embodiments, the array substrate 1 includes a substrate and a driving circuit layer (not shown) disposed on the substrate. The substrate can be a flexible substrate or a rigid substrate. The driving circuit layer is formed by stacking an active layer, a metal layer, and an insulating layer, and pixel driving circuits are formed in the driving circuit layer. The array substrate 1 can be replaced with an array substrate in a known display panel to achieve the same or similar functions.

[0042] Please refer to Figure 1. The light-emitting device layer 2 includes a first light-emitting device 21 and a second light-emitting device 22. The first light-emitting device 21 and the second light-emitting device 22 emit different colors, and the forward voltage of the first light-emitting device 21 is less than the forward voltage of the second light-emitting device 22.

[0043] Please refer to Figure 1. The first light-emitting device 21 is a single-emitting-layer light-emitting device, which includes a first light-emitting layer 211. The second light-emitting device 22 is a double-layer stacked light-emitting device, which includes a second light-emitting layer 221, a third light-emitting layer 222, and a cathode layer 202. The third light-emitting layer 222 is disposed above the second light-emitting layer 221, and the cathode layer 202 is disposed on the side of the third light-emitting layer 222 away from the second light-emitting layer 221. The number of microcavity resonant nodes of the first light-emitting layer 211 is the same as the number of microcavity resonant nodes of the third light-emitting layer 222.

[0044] In the embodiments of this application, by setting the first light-emitting device 21 with a smaller forward voltage as a single-layer light-emitting device with only one first light-emitting layer 211, the operating current of the first light-emitting device 21 under low brightness is increased, avoiding the decrease in color and brightness uniformity caused by insufficient current control accuracy under low brightness due to excessively high luminous efficiency. The second light-emitting device 22 with a larger forward voltage is set as a stacked light-emitting device with a second light-emitting layer 221 and a third light-emitting layer 222, so that the number of microcavity resonant nodes of the first light-emitting layer 211 is the same as the number of microcavity resonant nodes of the third light-emitting layer 222, thereby reducing the operating current of the second light-emitting device 22. This can improve the luminous efficiency of the second light-emitting device 22, thereby improving the color and brightness uniformity of the display panel while improving the luminous efficiency of the display panel.

[0045] It should be noted that if the first light-emitting layer 211 of the first light-emitting device 21 and the third light-emitting layer 222 of the second light-emitting device 22 have different numbers of microcavity resonant nodes and microcavity lengths, the inconsistency in the degree of brightness attenuation of the first light-emitting device 21 and the second light-emitting device 22 with viewing angle deflection will intensify, leading to problems such as deterioration of visual effects such as viewing angle distortion in the display panel. The embodiments of this application improve the consistency of the degree of brightness attenuation of the first light-emitting device 21 and the second light-emitting device 22 with viewing angle deflection by making the number of microcavity resonant nodes of the first light-emitting layer 211 the same as the number of microcavity resonant nodes of the third light-emitting layer 222 of the second light-emitting device 22, which is closest to the cathode layer 202, thus avoiding problems such as deterioration of visual effects such as viewing angle distortion in the display panel.

[0046] In some embodiments, please refer to FIG1. ​​The light-emitting device layer 2 includes an anode layer 201, a hole injection layer 203 and a first hole transport layer 204 sequentially stacked on the array substrate 1. The anode layer 201 includes a plurality of patterned anodes. Each light-emitting device has a corresponding anode. The hole injection layer 203 and the first hole transport layer 204 are both film layers that are disposed on the entire surface. The first light-emitting device 21 and the second light-emitting device 22 share the hole injection layer 203 and the first hole transport layer 204.

[0047] In some embodiments, the anode layer 201 is a reflective anode, and the cathode layer 202 is a semi-transparent cathode.

[0048] Referring to Figures 1 and 2, Figure 2 is a schematic diagram of the microcavity resonance of the second light-emitting device in the display panel provided by the embodiment of this application. Taking the second light-emitting device 22 as an example, the second light-emitting device 22 is a second-order microcavity double-layer stacked top-emitting organic light-emitting diode device. The condition for achieving microcavity resonance is that the directly emitted light (L1, L3) and the light emitted after being reflected by the lower anode layer 201 (L2, L4) have an optical path difference that is an integer multiple of the wavelength, i.e., L2-L1=k1λ, L4-L3=k2λ, where k1 and k2 are both integers. k1 is the number of microcavity resonance nodes of the second light-emitting layer 221, and k3 is the number of microcavity resonance nodes of the third light-emitting layer 222. The overall cavity length of the second-order microcavity is λ, which is the optical path between the anode layer 201 and the cathode layer 202. It should be noted that since the semi-transparent cathode also has reflectivity, it is actually a multi-beam interference effect. Here, the interference with only one anode reflection is used as an example for theoretical explanation.

[0049] In some embodiments, the number of microcavity resonant nodes in the second light-emitting layer 221 is less than the number of microcavity resonant nodes in the third light-emitting layer 222. It should be noted that the number of microcavity resonant nodes in the light-emitting layer is related to the film thickness of the light-emitting device layer 2. Since the second light-emitting layer 221 is closer to the anode layer 201, the number of microcavity resonant nodes in the second light-emitting layer 221 is less than the number of microcavity resonant nodes in the third light-emitting layer 222.

[0050] In some embodiments, the number of microcavity resonant nodes in the second light-emitting layer 221 is less than or equal to 2, and the number of microcavity resonant nodes in the third light-emitting layer 222 is less than or equal to 3. It should be noted that since the number of microcavity resonant nodes in the light-emitting layers is related to the thickness of the light-emitting device layer 2, if the number of microcavity resonant nodes in the second and third light-emitting layers 221 is large, the thickness of the second and third light-emitting layers 221 will increase, leading not only to an increase in the overall thickness of the display panel but also to an increase in the production cost of the display panel. Therefore, limiting the number of microcavity resonant nodes in the second light-emitting layer 221 to less than 2 and the number of microcavity resonant nodes in the third light-emitting layer 222 to less than 3 can not only improve the viewing angle color shift problem but also avoid increasing production costs.

[0051] In one embodiment, referring to FIG1, the second light-emitting layer 221 has 1 microcavity resonant node and the third light-emitting layer 222 has 2 microcavity resonant nodes.

[0052] Referring to Figures 1 and 2, taking the second light-emitting device 22 as an example, the optical path lengths of its second light-emitting layer 221 with the anode layer and the cathode layer are 1 / 4λ and 3 / 4λ, respectively, and the optical path lengths of its third light-emitting layer 222 with the anode layer and the cathode layer are 3 / 4λ and 1 / 4λ, respectively. Furthermore, after reflection by the anode layer, the light experiences a half-wave loss, extending its optical path by 1 / 2λ. Therefore, the optical path difference between the light directly emitted from the second light-emitting layer 221 and the light emitted after reflection by the anode layer is L2-L1=1 / 4λ+1 / 2λ+λ-3 / 4λ=λ, i.e., k1=1, where k1 is the number of microcavity resonant nodes in the second light-emitting layer 221; the optical path difference between the light directly emitted from the third light-emitting layer 222 and the light emitted after reflection by the anode layer is L4-L3=3 / 4λ+1 / 2λ+λ-1 / 4λ=2λ, i.e., k2=2, where k2 is the number of microcavity resonant nodes in the third light-emitting layer 222.

[0053] In some embodiments, referring to FIG1, the second light-emitting device 22 further includes a charge generation layer 223, which is disposed between the second light-emitting layer 221 and the third light-emitting layer 222. The charge generation layer 223 has strong conductivity, which can improve the luminous efficiency and lifespan of the second light-emitting device 22.

[0054] In some embodiments, referring to FIG1, the orthographic projection of the charge generation layer 223 on the array substrate 1 is separately disposed from the orthographic projection of the first light-emitting layer 211 on the array substrate 1. Since the first light-emitting device 21 is a single-layer light-emitting device, the charge generation layer 223 is not provided in the first light-emitting device 21. This can prevent the second light-emitting device 22 from leaking current to the adjacent first light-emitting device 21 through the charge generation layer 223, thereby solving the problem of color crosstalk of the first light-emitting device 21 at low brightness.

[0055] In some embodiments, a charge generation layer 223 can be deposited only in the area corresponding to the second light-emitting device 22 using a fine metal mask, and no charge generation layer 223 will be formed in other areas. This can prevent the second light-emitting device 22 from leaking current to the adjacent first light-emitting device 21 through the charge generation layer 223, thereby solving the problem of color crosstalk of the first light-emitting device 21 at low brightness.

[0056] In some embodiments, referring to FIG1, the charge generation layer 223 includes an N-type charge generation layer 2231 and a P-type charge generation layer 2232. The N-type charge generation layer 2231 is disposed between the second light-emitting layer 221 and the third light-emitting layer 222. The N-type charge generation layer 2231 has a high electron mobility and is configured to provide electrons to the second light-emitting layer 221. The P-type charge generation layer 2232 is disposed between the N-type charge generation layer 2231 and the third light-emitting layer 222. The P-type charge generation layer 2232 has a high hole mobility and is configured to provide holes to the third light-emitting layer 222.

[0057] In some implementations, please refer to FIG1, the first light-emitting device 21 further includes a second hole transport layer 212, which is disposed on the surface of the first hole transport layer 204 away from the array substrate 1, and the first light-emitting layer 211 is disposed on the second hole transport layer 212.

[0058] In some embodiments, the second hole transport layer 212 can be formed by vapor deposition on the second hole transport layer 212 corresponding to the first hole transport layer 204 using a fine metal mask. This second hole transport layer 212 can supplement and adjust the first light-emitting layer 211 to the microcavity resonant position, so that the first light-emitting layer 211 and the third light-emitting layer 222 have the same number of microcavity resonant nodes. This can improve the consistency of the brightness attenuation of the first light-emitting device 21 and the second light-emitting device 22 with the viewing angle deflection, and avoid the problem of visual effect deterioration such as the screen deflection.

[0059] In some embodiments, please refer to FIG1, the first light-emitting device 21 further includes a first electron blocking layer 213, which is disposed between the first light-emitting layer 211 and the second hole transport layer 212.

[0060] In some embodiments, referring to FIG1, the second light-emitting device 22 further includes a second electron blocking layer 224, a first hole blocking layer 225, a first electron transport layer 226, a third hole transport layer 227, and a third electron blocking layer 228. The second electron blocking layer 224 is disposed on the portion of the first hole transport layer 204 corresponding to the second light-emitting device 22. The second light-emitting layer 221 is disposed on the second electron blocking layer 224. The first hole blocking layer 225 is disposed on the second light-emitting layer 221. The first electron transport layer 226 is disposed on the first hole blocking layer 225. The N-type charge generating layer 2231 is disposed on the first electron transport layer 226. The P-type charge generating layer 2232 is disposed on the N-type charge generating layer 2231. The third hole transport layer 227 is disposed on the P-type charge generating layer 2232. The third electron blocking layer 228 is disposed on the third hole transport layer 227. The third light-emitting layer 222 is disposed on the third electron blocking layer 228.

[0061] In some embodiments, referring to FIG1, the thickness of the third hole transport layer 227 is less than the thickness of the second hole transport layer 212. In this way, the second hole transport layer 212 can be used to supplement and adjust the first light-emitting layer 211 to the microcavity resonant position, so that the first light-emitting layer 211 and the third light-emitting layer 222 have the same number of microcavity resonant nodes. This can improve the consistency of the degree of brightness attenuation of the first light-emitting device 21 and the second light-emitting device 22 with the viewing angle deflection, and avoid the problem of visual effect deterioration such as the corner deflection of the display panel.

[0062] In some embodiments, the second electron blocking layer 224, the second light-emitting layer 221, the first hole blocking layer 225, the first electron transport layer 226, the N-type charge generation layer 2231, the P-type charge generation layer 2232, the third hole transport layer 227, the third electron blocking layer 228, and the third light-emitting layer 222 can all be sequentially deposited on the portion of the first hole transport layer 204 corresponding to the second light-emitting device 22 using a fine metal mask.

[0063] In some embodiments, the light-emitting device layer 2 further includes a second hole blocking layer 205, a second electron transport layer 206, and an electron injection layer 207 sequentially stacked on the first light-emitting layer 211 and the third light-emitting layer 222. The cathode layer 202 is disposed on the electron injection layer 207. The second hole blocking layer 205, the second electron transport layer 206, the electron injection layer 207, and the cathode layer 202 are all film layers disposed on the entire surface. The first light-emitting device 21 and the second light-emitting device 22 share the second hole blocking layer 205, the second electron transport layer 206, the electron injection layer 207, and the cathode layer 202.

[0064] In some embodiments, the first light-emitting layer 211 is configured to emit red or green light, and the second light-emitting layer 221 and the third light-emitting layer 222 are configured to emit blue light. Compared with red and green light-emitting devices, blue light-emitting devices have higher forward voltage and lower luminous efficiency. By setting the second light-emitting device 22 as a double-layer stacked light-emitting structure, the operating current of the second light-emitting device 22 and the luminous efficiency of the second light-emitting device 22 can be improved and reduced, thereby reducing the power consumption of the display panel.

[0065] In some embodiments, please refer to FIG1, the light-emitting device layer 2 includes a plurality of first light-emitting devices 21, which can be divided into first sub-light-emitting devices 21a and second sub-light-emitting devices 21b. The first light-emitting layer 211 in the first sub-light-emitting device 21a is configured to emit red light, and the second light-emitting layer 221 in the second sub-light-emitting device 21b is configured to emit green light. The first sub-light-emitting devices 21a, the second sub-light-emitting devices 21b and the second light-emitting devices 22 are arranged in a pixel arrangement.

[0066] Distinguishing between efficiency, power consumption, L8 NTSC color gamut, and 60° color deviation values: Example 1: 100% 100% 102% 3.9; Example 2: 176% 84% 71% 4.1; Example 3: 171% 89% 100% 11.9; Example 1: 122% 94% 101% 3.3

[0067] Table 1. Comparison of luminous performance data of display panels

[0068] Please refer to Table 1, which shows the comparison data of the luminous performance of the display panels. In Comparative Example 1, all light-emitting devices are single-layer light-emitting devices, and the number of microcavity resonant nodes in the light-emitting layer of all light-emitting devices in Comparative Example 1 is 2. In Comparative Example 2, all light-emitting devices are double-layer stacked light-emitting devices, and the number of microcavity resonant nodes in the light-emitting layer of all light-emitting devices in Comparative Example 2 is 2. In Comparative Example 3, the red and green light-emitting devices are single-layer light-emitting devices, and the blue light-emitting device is a double-layer stacked light-emitting device. The number of microcavity resonant nodes in the light-emitting layers of both the red and green light-emitting devices is 2. The distance between the blue light-emitting device and the cathode is... The number of microcavity resonant nodes in the farthest light-emitting layer is 2, and the number of microcavity resonant nodes in the light-emitting layer closer to the cathode layer is 3. Embodiment 1 is the display panel provided by the embodiment of this application. The red light-emitting device and the green light-emitting device (i.e., the first light-emitting device 22) are both single-layer light-emitting devices, and the blue light-emitting device (i.e., the second light-emitting device 22) is a double-layer stacked light-emitting device. The number of microcavity resonant nodes in the light-emitting layers of the red light-emitting device and the green light-emitting device is 2. In the blue light-emitting device, the number of microcavity resonant nodes in the light-emitting layer farther from the cathode layer is 1, and the number of microcavity resonant nodes in the light-emitting layer closer to the cathode layer is 2.

[0069] Table 1 shows the data obtained by lighting the sample at the same brightness using the corresponding lighting equipment. A luminance meter was used to measure the brightness of the sample's white light 255 grayscale image, and a multimeter was used to measure the cathode output current of the sample's white light 255 grayscale image. The luminous efficiency and power consumption of the sample's white light 255 grayscale image were calculated using the corresponding formulas. Low-brightness color crosstalk is represented using the white light 8-grayscale NTSC color gamut value. According to Table 1, based on the luminous efficiency and power consumption of Comparative Example 1, Comparative Example 2's luminous efficiency increased to 176%, and power consumption decreased to 84%, but the color gamut was only 71%, and the color deviation at a 60° viewing angle increased to 4.1; Comparative Example 3's luminous efficiency increased to 171%, power consumption decreased to 89%, and the color gamut was 100%, but the color deviation at a 60° viewing angle increased to 11.9; Example 1's luminous efficiency increased to 120%, power consumption decreased to 94%, the color gamut was 101%, and the color deviation at a 60° viewing angle was only 3.3. As can be seen from the comparison, the display panel provided by the embodiments of this application can not only improve the luminous efficiency of the display panel and reduce the power consumption of the display panel, but also enable the display panel to have a good color gamut and avoid problems such as visual effect deterioration such as color shift of the display panel.

[0070] Based on the display panel provided in the above embodiments of this application, embodiments of this application also provide a display device. Please refer to FIG3, which is a schematic structural diagram of the display device provided in the embodiments of this application. The display device 1000 includes a display panel 100 and a housing 200, with the display panel 100 disposed on the housing 200. The display device 1000 can be any of the display panels provided in the above embodiments. The display device provided in the embodiments of this application can achieve the same technical effects as the display panels provided in any of the above embodiments, and will not be elaborated upon here.

[0071] The beneficial effects of the embodiments of this application are as follows: The embodiments of this application provide a display panel and a display device. The display panel includes an array substrate and a light-emitting device layer. The light-emitting device layer includes a first light-emitting device and a second light-emitting device. By setting the first light-emitting device with a smaller forward voltage as a single-layer light-emitting device with only one first light-emitting layer, the operating current of the first light-emitting device under low brightness is increased, avoiding the decrease in color and brightness uniformity caused by insufficient current control accuracy under low brightness due to excessively high luminous efficiency. The second light-emitting device with a larger forward voltage is set as a stacked light-emitting device with a second light-emitting layer and a third light-emitting layer, and the number of microcavity resonant nodes of the first light-emitting layer is the same as the number of microcavity resonant nodes of the third light-emitting layer, thereby improving the luminous efficiency of the second light-emitting device. Thus, the luminous efficiency of the display panel can be improved while improving the uniformity of color and brightness of the display panel.

[0072] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display panel, comprising: Array substrate; A light-emitting device layer is disposed on the array substrate. The light-emitting device layer includes a first light-emitting device and a second light-emitting device. The first light-emitting device and the second light-emitting device emit different colors. The forward voltage of the first light-emitting device is less than the forward voltage of the second light-emitting device. The first light-emitting device is a single-emitting-layer light-emitting device, which includes a first light-emitting layer. The second light-emitting device includes a second light-emitting layer, a third light-emitting layer, and a cathode layer. The third light-emitting layer is disposed above the second light-emitting layer, and the cathode layer is disposed on the side of the third light-emitting layer away from the second light-emitting layer. The number of microcavity resonant nodes in the first light-emitting layer is the same as the number of microcavity resonant nodes in the third light-emitting layer.

2. The display panel as claimed in claim 1, wherein, The number of microcavity resonant nodes in the second light-emitting layer is less than the number of microcavity resonant nodes in the third light-emitting layer.

3. The display panel as claimed in claim 1, wherein, The number of microcavity resonant nodes in the second light-emitting layer is less than or equal to 2, and the number of microcavity resonant nodes in the third light-emitting layer is less than or equal to 3.

4. The display panel as claimed in claim 1, wherein, The second light-emitting device further includes a charge generation layer, which is disposed between the second light-emitting layer and the third light-emitting layer.

5. The display panel as claimed in claim 4, wherein, The orthographic projection of the charge generation layer on the array substrate is separate from the orthographic projection of the first light-emitting layer on the array substrate.

6. The display panel as claimed in claim 4, wherein, The charge generation layer includes: An N-type charge generation layer is disposed between the second light-emitting layer and the third light-emitting layer, wherein the N-type charge generation layer is configured to provide electrons to the second light-emitting layer; A P-type charge generation layer is disposed between the N-type charge generation layer and the third light-emitting layer, wherein the P-type charge generation layer is configured to provide holes to the third light-emitting layer.

7. The display panel as claimed in claim 1, wherein, The light-emitting device layer includes an anode layer, a hole injection layer, and a first hole transport layer stacked on the array substrate, wherein the first light-emitting device and the second light-emitting device share the first hole transport layer. The first light-emitting device further includes a second hole transport layer, which is disposed on the surface of the first hole transport layer away from the array substrate, and the first light-emitting layer is disposed on the second hole transport layer.

8. The display panel as claimed in claim 7, wherein, The second light-emitting device further includes a third hole transport layer, which is disposed between the second light-emitting layer and the third light-emitting layer, and the thickness of the third hole transport layer is less than the thickness of the second hole transport layer.

9. The display panel according to any one of claims 1 to 8, wherein, The first light-emitting layer is configured to emit red or green light, and the second and third light-emitting layers are configured to emit blue light.

10. A display device comprising a display panel, the display panel comprising: Array substrate; A light-emitting device layer is disposed on the array substrate. The light-emitting device layer includes a first light-emitting device and a second light-emitting device. The first light-emitting device and the second light-emitting device emit different colors. The forward voltage of the first light-emitting device is less than the forward voltage of the second light-emitting device. The first light-emitting device is a single-emitting-layer light-emitting device, which includes a first light-emitting layer. The second light-emitting device includes a second light-emitting layer, a third light-emitting layer, and a cathode layer. The third light-emitting layer is disposed above the second light-emitting layer, and the cathode layer is disposed on the side of the third light-emitting layer away from the second light-emitting layer. The number of microcavity resonant nodes in the first light-emitting layer is the same as the number of microcavity resonant nodes in the third light-emitting layer.

11. The display device as claimed in claim 10, wherein, The number of microcavity resonant nodes in the second light-emitting layer is less than the number of microcavity resonant nodes in the third light-emitting layer.

12. The display device as claimed in claim 10, wherein, The number of microcavity resonant nodes in the second light-emitting layer is less than or equal to 2, and the number of microcavity resonant nodes in the third light-emitting layer is less than or equal to 3.

13. The display device as claimed in claim 10, wherein, The second light-emitting device further includes a charge generation layer, which is disposed between the second light-emitting layer and the third light-emitting layer.

14. The display device as claimed in claim 13, wherein, The orthographic projection of the charge generation layer on the array substrate is separate from the orthographic projection of the first light-emitting layer on the array substrate.

15. The display device as claimed in claim 13, wherein, The charge generation layer includes: An N-type charge generation layer is disposed between the second light-emitting layer and the third light-emitting layer, wherein the N-type charge generation layer is configured to provide electrons to the second light-emitting layer; A P-type charge generation layer is disposed between the N-type charge generation layer and the third light-emitting layer, wherein the P-type charge generation layer is configured to provide holes to the third light-emitting layer.

16. The display device as claimed in claim 10, wherein, The light-emitting device layer includes an anode layer, a hole injection layer, and a first hole transport layer stacked on the array substrate, wherein the first light-emitting device and the second light-emitting device share the first hole transport layer. The first light-emitting device further includes a second hole transport layer, which is disposed on the surface of the first hole transport layer away from the array substrate, and the first light-emitting layer is disposed on the second hole transport layer.

17. The display device as claimed in claim 16, wherein, The second light-emitting device further includes a third hole transport layer, which is disposed between the second light-emitting layer and the third light-emitting layer, and the thickness of the third hole transport layer is less than the thickness of the second hole transport layer.

18. The display device according to any one of claims 10 to 17, wherein the first light-emitting layer is configured to emit red or green light, and the second and third light-emitting layers are configured to emit blue light.

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