Display panel and display apparatus

Abstract

Disclosed in the present application are a display panel and a display apparatus. The display panel comprises a first optical microcavity region, a second optical microcavity region and a third optical microcavity region. The display panel further comprises a substrate, a first electrode, a light-emitting functional layer, a second electrode and a light extraction layer that are sequentially stacked, wherein the thickness of the light extraction layer located in the third optical microcavity region is less than the thickness of the light extraction layer located in the first optical microcavity region and is less than the thickness of the light extraction layer located in the second optical microcavity region.

Description

Display panel and display device

[0001] This application claims priority to Chinese patent application No. 202410491825.1, filed on April 22, 2024, 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] Organic light-emitting devices (OLEDs) have been widely used in various fields such as flat panel displays, solid-state lighting, transparent displays, flexible displays, and lighting due to their excellent characteristics such as solid-state light emission, wide viewing angle, low power consumption, fast response speed, and resistance to high and low temperatures.

[0004] In existing display panels, the refractive index of the substrate glass is greater than that of air, and the refractive index of the organic electroluminescent material layer is greater than that of the glass. Therefore, when light emitted by the organic electroluminescent material is energized and passes through the glass into the air, due to total internal reflection, a large portion of the light is confined within the organic electroluminescent material layer. This significantly reduces the light extraction efficiency of the display panel; only about 20% of the light can escape beyond the panel, while the remaining approximately 80% is trapped inside due to total internal reflection. For the same brightness requirement, lower light extraction efficiency requires a larger light-emitting driving current, resulting in higher power consumption. Therefore, maximizing the light extraction efficiency of display panels has become a key research focus for engineers. Technical issues

[0005] The purpose of this invention is to provide a display panel and a display device to solve the technical problem of low light emission efficiency of the display panel. Technical solutions

[0006] The present invention provides a display panel comprising: a first optical microcavity region, a second optical microcavity region, and a third optical microcavity region. The display panel further comprises a substrate, a first electrode, a light-emitting functional layer, a second electrode, and a light extraction layer. The first electrode is disposed on one side of the substrate; the light-emitting functional layer is disposed on the side of the first electrode away from the substrate; the second electrode is disposed on the side of the light-emitting functional layer away from the first electrode; the light extraction layer is disposed on the side of the second electrode away from the first electrode; the thickness of the light extraction layer located in the third optical microcavity region is less than the thickness of the light extraction layer located in the first optical microcavity region, and less than the thickness of the light extraction layer located in the second optical microcavity region.

[0007] The present invention also provides a display device, including the display panel described above. Attached Figure Description

[0008] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0009] Figure 1 is a schematic diagram of the structure of the display panel provided in Embodiment 1 of this application.

[0010] Figure 2 is a partial structural diagram of the display panel shown in Figure 1.

[0011] Figures 3, 4, and 5 are comparison diagrams of the white light efficiency of the light extraction layer in the differentiated display panel and the light extraction layer in the non-differentiated display panel in Figure 1.

[0012] Figure 6 is a schematic diagram of the structure of the display panel provided in Embodiment 2 of this application.

[0013] Figure 7 is a schematic diagram of the structure of the display panel provided in embodiments 3 to 5 of this application.

[0014] Figure 8 is a schematic diagram of the structure of the display panel provided in Embodiment 6 of this application.

[0015] Figure 9 is a schematic diagram of the structure of the display panel provided in Embodiment 7 of this application.

[0016] Figure 10 is a schematic diagram of the structure of the display panel provided in embodiments 8 to 10 of this application.

[0017] Figure 11 is a schematic diagram of the structure of the display panel provided in Embodiment 11 of this application.

[0018] Figure 12 is a schematic diagram of the structure of the display panel provided in Embodiment 12 of this application.

[0019] Figure 13 is a schematic diagram of the structure of the display panel provided in Embodiment 13 of this application.

[0020] The components in the attached diagram are labeled as follows: A1-First optical microcavity region; A2-Second optical microcavity region; A3-Third optical microcavity region; 1-Substrate; 2-First electrode; 3-Light-emitting functional layer; 31-First light-emitting unit; 32-Second light-emitting unit; 33-Third light-emitting unit; 4-Second electrode; 5-Light extraction layer; 51-First sub-light extraction layer; 52-Second sub-light extraction layer; 53-Third sub-light extraction layer; 54-Fourth sub-light extraction layer; 6-Pixel definition layer; 7-Thin film encapsulation layer. Embodiments of the present invention

[0021] 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.

[0022] In the description of this application, it should be understood that 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, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] As shown in Figure 1, this application embodiment provides a display panel and a display device. The display panel includes a first optical microcavity region A1, a second optical microcavity region A2, and a third optical microcavity region A3. Each of the first optical microcavity region A1, the second optical microcavity region A2, and the third optical microcavity region A3 is provided with a first electrode 2, a light-emitting functional layer 3, a second electrode 4, and a light extraction layer 5. The thickness of the light extraction layer 5 located in the third optical microcavity region A3 is less than that located in the first optical microcavity region A1; the thickness of the light extraction layer 5 located in the third optical microcavity region A3 is less than that located in the second optical microcavity region A2. Thus, the light extraction layer 5 is located on the upper surface of the second electrode 4, which can adjust the reflectivity / transmittance of the interface of the second electrode 4. Furthermore, the differentiated design of the thickness of the light extraction layer 5 within the optical microcavity region can simultaneously improve the light emission intensity of the display panel in the red, green, and blue bands, thereby improving the light emission efficiency of the display panel, mainly improving the white light efficiency of the display panel.

[0025] Example 1

[0026] As shown in Figure 1, this application embodiment provides a display panel, which includes a first optical microcavity region A1, a second optical microcavity region A2, and a third optical microcavity region A3.

[0027] As shown in Figure 1, the display panel also includes a substrate 1, a light-emitting functional layer 3, a second electrode 4, and a light extraction layer 5.

[0028] A first electrode 2 is provided on the substrate 1. The first electrode 2 is the anode, and the anode can be made of metal, metal oxide, or conductive polymer. Metals include copper, gold, silver, iron, chromium, nickel, manganese, palladium, platinum, and their alloys; metal oxides include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide, and indium gallium zinc oxide (IGZO); and conductive polymers include polyaniline, polypyrrole, and poly(3-methylthiophene). In addition to the above materials and combinations thereof that facilitate hole injection, known materials suitable for anodes are also included.

[0029] The light-emitting functional layer 3 is disposed on one side of the first electrode 2, that is, the light-emitting functional layer 3 is disposed on the first electrode 2. Specifically, the light-emitting functional layer 3 includes at least one light-emitting layer (EML) and any one or a combination of at least two of the following: a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer (EBL), a hole blocking layer (HBL), an electron transport layer (ETL), or an electron injection layer (EIL) disposed on both sides of the light-emitting layer. The light-emitting functional layer 3 includes a first light-emitting unit 31, a second light-emitting unit 32, and a third light-emitting unit 33 displaying different colors. The peak of the emission spectrum of the first light-emitting unit 31 is larger than the peak of the emission spectrum of the second light-emitting unit 32, and the peak of the emission spectrum of the second light-emitting unit 32 is larger than the peak of the emission spectrum of the third light-emitting unit 33. The first light-emitting unit 31 is a red light-emitting unit, the second light-emitting unit 32 is a green light-emitting unit, and the third light-emitting unit is a blue light-emitting unit. The first light-emitting unit 31 is set in the first optical microcavity region A1, the second light-emitting unit 32 is set in the second optical microcavity region A2, and the third light-emitting unit 33 is set in the third optical microcavity region A3.

[0030] The second electrode 4 is disposed on the side of the light-emitting functional layer 3 away from the first electrode 2, that is, the second electrode 4 is disposed on the light-emitting functional layer 3. The second electrode 4 is a cathode, and the cathode can be made of metal or multilayer metal materials; wherein the metals include aluminum, magnesium, silver, indium, tin, titanium, etc. and their alloys, and the multilayer metal materials include LiF / Al, LiO2 / Al, BaF2 / Al, etc. In addition to the above materials and combinations that facilitate electron injection, known materials suitable for making cathodes are also included.

[0031] It should be noted that the first electrode 2, together with the light-emitting functional layer 3 and the second electrode 4, constitute a light-emitting device layer. This light-emitting device layer includes multiple light-emitting devices, and the location of each light-emitting device is divided according to the area of ​​the light-emitting unit, namely, red light-emitting devices, green light-emitting devices, and blue light-emitting devices.

[0032] The light extraction layer 5 is disposed on the side of the second electrode 4 away from the first electrode 2. That is, the light extraction layer 5 is disposed on the second electrode 4, so that it can adjust the reflectivity / transmittance of the interface of the second electrode 4.

[0033] In some embodiments, the thickness of the light extraction layer 5 located in the third optical microcavity region A3 is less than the thickness of the light extraction layer 5 located in the first optical microcavity region A1; the thickness of the light extraction layer 5 located in the third optical microcavity region A3 is less than the thickness of the light extraction layer 5 located in the second optical microcavity region A2. This configuration can adjust the reflectivity / transmittance of the interface of the second electrode 4, and can simultaneously increase the light emission intensity of the display panel in the red, green and blue bands, thereby improving the light emission efficiency of the display panel, mainly improving the white light efficiency of the display panel.

[0034] The thickness of the light extraction layer 5 located in the first optical microcavity region A1 can be equal to or unequal to the thickness of the light extraction layer 5 located in the second optical microcavity region A2. In this embodiment, the thickness of the light extraction layer 5 located in the first optical microcavity region A1 is greater than the thickness of the light extraction layer 5 located in the second optical microcavity region A2.

[0035] As shown in Figure 2, an organic microcavity structure is formed between the first electrode 2 and the second electrode 4 in the display panel. The expression for the light emission gain intensity Gcav of the organic microcavity on the display panel is as follows:

[0036] In the above formula, R1 represents the reflectivity of the organic microcavity at the first electrode 2 (anode), φ1 represents the phase difference of the organic microcavity at the first electrode 2, R2 represents the reflectivity of the organic microcavity at the second electrode 2 (cathode), φ2 represents the phase difference of the organic microcavity at the second electrode 4, Zi represents the distance between the light-emitting center and the first electrode 2, L represents the total length of the microcavity between the light-emitting center and the first electrode 2, n represents the composite refractive index of the organic light-emitting material in the light-emitting functional layer 3, and λ air This indicates the wavelength of light in the air.

[0037] As can be seen from the above formula, the light intensity of the display panel is related to the reflectivity of the metal (cathode) interface in the organic microcavity structure, and the light extraction efficiency varies with the light wavelength. Therefore, in this embodiment, by setting the light extraction layer 5 on the second electrode 4 and adopting a differentiated design for the thickness of the light extraction layer 5 in the optical microcavity region, it can not only adjust the reflectivity / transmittance of the second electrode 4 (cathode) interface, but also simultaneously improve the light intensity of the display panel in the red, green and blue bands, thereby improving the light extraction efficiency of the display panel, mainly improving the white light efficiency of the display panel.

[0038] As shown in Figure 1, in this embodiment, the light extraction layer 5 includes a first sub-light extraction layer 51, a second sub-light extraction layer 52, and a third sub-light extraction layer 53.

[0039] The first sub-light extraction layer 51 is disposed on the side of the second electrode 4 away from the first electrode 2. That is, the first sub-light extraction layer 51 is disposed on the second electrode 4 and is located in the first optical microcavity region A1, the second optical microcavity region A2 and the third optical microcavity region A3.

[0040] The second sub-light extraction layer 52 is disposed on the side of the first sub-light extraction layer 51 away from the first electrode 2. That is, the second sub-light extraction layer 52 is disposed on the first sub-light extraction layer 51. The second sub-light extraction layer 52 is located in the first optical microcavity region A1, the second optical microcavity region A2 and the third optical microcavity region A3.

[0041] The third sub-light extraction layer 53 is disposed on the side of the second sub-light extraction layer 52 away from the first electrode 2. That is, the third sub-light extraction layer 53 is disposed on the second sub-light extraction layer 52 and is located in the first optical microcavity region A1.

[0042] In this embodiment, three sub-light extraction layers 5 are provided in the first optical microcavity region A1, and two sub-light extraction layers 5 are provided in both the second optical microcavity region A2 and the third optical microcavity region A3. This allows the structure of the light extraction layers 5 to have differentiated performance in the optical microcavity regions of the display panel, thereby simultaneously improving the light emission intensity of the red, green and blue band display panel, and thus improving the light emission efficiency of the display panel, mainly improving the white light efficiency of the display panel.

[0043] In some embodiments, the refractive index of the first sub-light extraction layer 51 is less than that of the second sub-light extraction layer 52; the refractive index of the third sub-light extraction layer 53 is less than that of the second sub-light extraction layer 52, thereby further improving the light extraction efficiency of the display panel.

[0044] In some embodiments, the refractive index of both the first sub-light extraction layer 51 and the third sub-light extraction layer 53 is in the range of 1.3 to 1.6. It is understood that the refractive index of both the first sub-light extraction layer 51 and the third sub-light extraction layer 53 can be any one of 1.3, 1.4, 1.5, and 1.6, or a range between any two values. It should be noted that the refractive index of the first sub-light extraction layer 51 and the refractive index of the third sub-light extraction layer 53 can be the same or different; no particular limitation is made here, and the specific setting depends on the actual situation.

[0045] In some embodiments, the refractive index of the second sub-light extraction layer 52 is 1.8 to 2.2, and the refractive index of the second sub-light extraction layer 52 can be any one of 1.8, 1.9, 2.0, 2.1, 2.2 or a range between any two values.

[0046] In some embodiments, the first sub-light extraction layer 51 can be made of organic or inorganic materials. Organic materials can be CPL, and inorganic materials can be SiN, SiON, or other known materials suitable for the first sub-light extraction layer 51.

[0047] In some embodiments, the second sub-light extraction layer 52 can be made of organic or inorganic materials. Organic materials can be CPL, and inorganic materials can be SiN, SiON, or other known materials suitable for the second sub-light extraction layer 52.

[0048] In some embodiments, the third sub-light extraction layer 53 can be made of organic or inorganic materials. Organic materials can be CPL, and inorganic materials can be SiN, SiON, or other known materials suitable for the third sub-light extraction layer 53.

[0049] The refractive index of the materials (organic / inorganic materials) of the first sub-light extraction layer 51, the second sub-light extraction layer 52, and the third sub-light extraction layer 53 is in the range of 1.3 to 2.2. The refractive index of the material can be any one of 1.3, 1.4, 1.5, 1.6, 1.8, 1.9, 2.0, 2.1, 2.2 or any range between any two values.

[0050] Table 1

[0051] Differentiated display panels refer to those where the thickness of the light extraction layer differs in each optical microcavity region, while non-differentiated display panels refer to those where the thickness of the light extraction layer is the same in each optical microcavity region.

[0052] As shown in Table 1 and Figures 3, 4, and 5, three sub-light extraction layers 5 are disposed in the first optical microcavity region A1, and two sub-light extraction layers 5 are disposed in both the second optical microcavity region A2 and the third optical microcavity region A3. Furthermore, the thickness of the light extraction layers 5 differs in these two regions to achieve a differentiated structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 9.3% compared to the non-differentiated display panel.

[0053] As shown in Figure 1, the display panel also includes a pixel definition layer 6 and a thin film encapsulation layer 7. The substrate 1 may include other film layers such as an array substrate. The pixel definition layer 6 is disposed on the same layer as the device layer. The light-emitting devices are disposed at intervals in the pixel definition layer 6, and the thin film encapsulation layer 7 is disposed on the light-emitting device layer.

[0054] This embodiment also provides a display device, including the display panel described above.

[0055] Example 2

[0056] As shown in Figure 6, this application provides a display panel and display device, which includes most of the technical solutions of embodiment 1, except that the third sub-light extraction layer 53 is located in the second optical microcavity region A2.

[0057] Table 2

[0058] As shown in Table 2, two sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the third optical microcavity region A3, and the thickness of the light extraction layers 5 in these two regions is different. Three sub-light extraction layers 5 are disposed in the second optical microcavity region A2 to obtain a differentiated structure of the light extraction layers 5. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 9.2% compared to the non-differentiated display panel.

[0059] Example 3

[0060] As shown in Figure 7, this application provides a display panel and display device, which includes most of the technical solutions of embodiment 1. The difference is that the third sub-light extraction layer 53 is located in both the first optical microcavity region A1 and the second optical microcavity region A2, and the thickness of the third sub-light extraction layer 53 located in the first optical microcavity region A1 is equal to the thickness of the third sub-light extraction layer 53 located in the second optical microcavity region A2.

[0061] Table 3

[0062] As shown in Table 3, two sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2, and the thickness of the light extraction layers 5 in these two regions is the same. Two sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated structure for the light extraction layers 5. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 2.2% compared to the non-differentiated display panel.

[0063] Example 4

[0064] This application provides a display panel and display device, which includes most of the technical solutions of embodiment 1. The difference is that the third sub-light extraction layer 53 is located in both the first optical microcavity region A1 and the second optical microcavity region A2, and the thickness of the third sub-light extraction layer 53 located in the first optical microcavity region A1 is greater than the thickness of the third sub-light extraction layer 53 located in the second optical microcavity region A2.

[0065] Table 4

[0066] As shown in Table 4, three sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2. The thickness of the third sub-light extraction layer 53 in the first optical microcavity region A1 is greater than that in the second optical microcavity region A2. Two sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated light extraction layer 5 structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 10.2% compared with that of the non-differentiated display panel.

[0067] Example 5

[0068] This application provides a display panel and display device, which includes most of the technical solutions of embodiment 1. The difference is that the third sub-light extraction layer 53 is located in both the first optical microcavity region A1 and the second optical microcavity region A2, and the thickness of the third sub-light extraction layer 53 located in the first optical microcavity region A1 is less than the thickness of the third sub-light extraction layer 53 located in the second optical microcavity region A2.

[0069] Table 5

[0070] As shown in Table 5, three sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2. The thickness of the third sub-light extraction layer 53 in the first optical microcavity region A1 is less than that in the second optical microcavity region A2. Two sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated light extraction layer 5 structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 10.3% compared with that of the non-differentiated display panel.

[0071] Example 6

[0072] As shown in Figure 8, this application provides a display panel and display device, which includes all the technical solutions of embodiment 1. The difference is that the light extraction layer 5 further includes a fourth sub-light extraction layer 54, which is disposed on the side of the third sub-light extraction layer 53 away from the first electrode 2 and located in the first optical microcavity region A1.

[0073] Table 6

[0074] As shown in Table 6, four sub-light extraction layers 5 are disposed in the first optical microcavity region A1, and two sub-light extraction layers 5 are disposed in both the second optical microcavity region A2 and the third optical microcavity region A3. Furthermore, the thickness of the light extraction layers 5 differs in these two regions to achieve a differentiated structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 14.3% compared to the non-differentiated display panel.

[0075] Example 7

[0076] As shown in Figure 9, this application provides a display panel and display device, which includes all the technical solutions of embodiment 2. The difference is that the light extraction layer 5 further includes a fourth sub-light extraction layer 54, which is disposed on the side of the third sub-light extraction layer 53 away from the first electrode 2 and located in the second optical microcavity region A2.

[0077] Table 7

[0078] As shown in Table 7, two sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the third optical microcavity region A3, and the thickness of the light extraction layers 5 in these two regions is different. Four sub-light extraction layers 5 are disposed in the second optical microcavity region A2 to obtain a differentiated structure of the light extraction layers 5. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 115.2% compared with that of the non-differentiated display panel.

[0079] Example 8

[0080] As shown in Figure 10, this application provides a display panel and display device, which includes all the technical solutions of embodiment 3. The difference is that the light extraction layer 5 further includes a fourth sub-light extraction layer 54, which is disposed on the side of the third sub-light extraction layer 53 away from the first electrode 2, and is located in the first optical microcavity region A1 and the second optical microcavity region A2.

[0081] Table 8

[0082] As shown in Table 8, four sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2, and the thickness of the light extraction layers 5 in these two regions is the same. Two sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated structure of the light extraction layers 5. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 2.2% compared with that of the non-differentiated display panel.

[0083] Example 9

[0084] This application provides a display panel and display device, which includes most of the technical solutions of embodiment 8. The difference is that the thickness of the fourth sub-light extraction layer 54 located in the first optical microcavity region A1 is greater than the thickness of the fourth sub-light extraction layer 54 located in the second optical microcavity region A2.

[0085] Table 9

[0086] As shown in Table 9, four sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2. The thickness of the fourth sub-light extraction layer 54 in the first optical microcavity region A1 is greater than that in the second optical microcavity region A2. Two sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated light extraction layer 5 structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 12.2% compared with that of the non-differentiated display panel.

[0087] Example 10

[0088] This application provides a display panel and display device, which includes most of the technical solutions of embodiment 8. The difference is that the thickness of the fourth sub-light extraction layer 54 located in the first optical microcavity region A1 is greater than the thickness of the fourth sub-light extraction layer 54 located in the second optical microcavity region A2.

[0089] Table 10

[0090] As shown in Table 10, three sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2. The thickness of the fourth sub-light extraction layer 54 located in the first optical microcavity region A1 is greater than that of the fourth sub-light extraction layer 54 located in the second optical microcavity region A2. Two sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated light extraction layer 5 structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 14.3% compared with that of the non-differentiated display panel.

[0091] Example 11

[0092] As shown in Figure 11, this application provides a display panel and display device, which includes all the technical solutions of embodiment 8, except that the third sub-light extraction layer 53 is located in the third optical microcavity region A3.

[0093] Table 11

[0094] As shown in Table 11, four sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2, and the thickness of the light extraction layers 5 in these two regions is the same. Three sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated structure of the light extraction layers 5. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 2.5% compared to the non-differentiated display panel.

[0095] Example 12

[0096] As shown in Figure 12, this application provides a display panel and display device, which includes all the technical solutions of embodiment 9, except that the third sub-light extraction layer 53 is located in the third optical microcavity region A3.

[0097] Table 12

[0098] As shown in Table 12, four sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2. The thickness of the fourth sub-light extraction layer 54 in the first optical microcavity region A1 is greater than that in the second optical microcavity region A2. Three sub-light extraction layers 5 are disposed in the third optical microcavity region A3 to obtain a differentiated light extraction layer 5 structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 12.2% compared with that of the non-differentiated display panel.

[0099] Example 13

[0100] As shown in Figure 13, this application provides a display panel and display device, which includes all the technical solutions of embodiment 10, except that the third sub-light extraction layer 53 is located in the third optical microcavity region A3.

[0101] Table 13

[0102] As shown in Table 13, three sub-light extraction layers 5 are disposed in both the first optical microcavity region A1 and the second optical microcavity region A2. The thickness of the fourth sub-light extraction layer 54 located in the first optical microcavity region A1 is greater than that of the fourth sub-light extraction layer 54 located in the second optical microcavity region A2. Three sub-light extraction layers 5 are also disposed in the third optical microcavity region A3 to obtain a differentiated light extraction layer 5 structure. Therefore, by comparing the differentiated display panel with the non-differentiated display panel, it can be found that the white light efficiency of the differentiated display panel is improved by 14.3% compared to the non-differentiated display panel.

[0103] Table 14

[0104] As shown in Table 14, when the thickness of the light extraction layer 5 in any two optical microcavity regions is equal, the light extraction efficiency of the display panel is slightly worse, as in Examples 3, 8, and 11. However, in other examples, the thickness of the light extraction layer 5 in each optical microcavity region is not equal, and the light extraction efficiency of the display panel is greatly improved. Among them, the white light efficiency of the display panel can be improved by 5% to 15%.

[0105] Research has shown that the number of light extraction layers 5 in this embodiment is preferably less than or equal to four. Since a number of light extraction layers 5 greater than four fails to further improve the white light efficiency of the display panel, a number of light extraction layers 5 of four or less is preferable. Furthermore, when the number of light extraction layers 5 is preferably less than or equal to four, this increases the number of photomasks, thereby increasing production costs.

[0106] In the light extraction layer 5, the number of high-refractive-index sub-light extraction layers 5 is less than or equal to two, and the number of low-refractive-index sub-light extraction layers 5 is also less than or equal to two. The range of high-refractive-index or low-refractive-index is 1.3 to 2.2. This can not only adjust the reflectivity / transmittance of the interface of the second electrode 4, but also simultaneously improve the light emission intensity of the display panel in the red, green and blue bands, thereby improving the light emission efficiency of the display panel.

[0107] This application provides a display panel and a display device. The display panel is divided into a first optical microcavity region A1, a second optical microcavity region A2, and a third optical microcavity region A3. Each of the first optical microcavity region A1, the second optical microcavity region A2, and the third optical microcavity region A3 is provided with a first electrode 2, a light-emitting functional layer 3, a second electrode 4, and a light extraction layer 5. The thickness of the light extraction layer 5 located in the third optical microcavity region A3 is less than the thickness of the light extraction layer 5 located in the first optical microcavity region A1; the thickness of the light extraction layer 5 located in the third optical microcavity region A3 is less than the thickness of the light extraction layer 5 located in the second optical microcavity region A2. Therefore, by placing the light extraction layer 5 on the upper surface of the second electrode 4, the reflectivity / transmittance of the interface of the second electrode 4 can be adjusted. Furthermore, by adopting a differentiated design for the thickness of the light extraction layer 5 within the optical microcavity region, the light emission intensity of the display panel in the red, green, and blue bands can be simultaneously improved, thereby increasing the light emission efficiency of the display panel.

[0108] In summary, this application provides a display panel and a display device. The display panel includes a first optical microcavity region, a second optical microcavity region, and a third optical microcavity region. Each of the first, second, and third optical microcavity regions is provided with a substrate, a light-emitting functional layer, a second electrode, and a light extraction layer. The thickness of the light extraction layer in the third optical microcavity region is less than that in the first optical microcavity region, and the thickness of the light extraction layer in the third optical microcavity region is less than that in the second optical microcavity region. Therefore, by placing the light extraction layer on the upper surface of the second electrode, the reflectivity / transmittance of the second electrode interface can be adjusted. Furthermore, by employing a differentiated design for the thickness of the light extraction layer within the optical microcavity regions, the light emission intensity of the display panel in the red, green, and blue wavelength bands can be simultaneously increased, thereby improving the light emission efficiency of the display panel.

[0109] The above provides a detailed description of a display panel and display device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, comprising: The first optical microcavity region, the second optical microcavity region, and the third optical microcavity region. The display panel also includes: substrate; The first electrode is disposed on one side of the substrate; A light-emitting functional layer is disposed on the side of the first electrode away from the substrate; The second electrode is disposed on the side of the light-emitting functional layer away from the first electrode; and A light extraction layer is disposed on the side of the second electrode away from the first electrode; The thickness of the light extraction layer located in the third optical microcavity region is less than the thickness of the light extraction layer located in the first optical microcavity region, and less than the thickness of the light extraction layer located in the second optical microcavity region.

2. The display panel according to claim 1, wherein, The light-emitting functional layer includes: a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that display different colors; The peak of the emission spectrum of the first light-emitting unit is greater than the peak of the emission spectrum of the second light-emitting unit, and the peak of the emission spectrum of the second light-emitting unit is greater than the peak of the emission spectrum of the third light-emitting unit. The first light-emitting unit is disposed in the first optical microcavity region; The second light-emitting unit is disposed in the region corresponding to the second optical microcavity. The third light-emitting unit is disposed in the region corresponding to the third optical microcavity.

3. The display panel according to claim 1, wherein, The thickness of the light extraction layer located in the first optical microcavity region is less than or equal to the thickness of the light extraction layer located in the second optical microcavity region; or... The thickness of the light extraction layer located in the first optical microcavity region is greater than the thickness of the light extraction layer located in the second optical microcavity region.

4. The display panel according to claim 3, wherein, The light extraction layer includes: The first sub-light extraction layer is disposed on the side of the second electrode away from the first electrode, and is located in the first optical microcavity region, the second optical microcavity region and the third optical microcavity region; The second sub-light extraction layer is disposed on the side of the first sub-light extraction layer away from the first electrode. Located in the first optical microcavity region, the second optical microcavity region, and the third optical microcavity region; The third sub-light extraction layer is disposed on the side of the second sub-light extraction layer away from the first electrode, and is located in the first optical microcavity region and / or the second optical microcavity region.

5. The display panel according to claim 4, wherein, The refractive index of the first sub-light extraction layer is less than the refractive index of the second sub-light extraction layer; The refractive index of the third sub-light extraction layer is less than that of the second sub-light extraction layer.

6. The display panel according to claim 5, wherein, The refractive index range of both the first sub-light extraction layer and the third sub-light extraction layer is 1.3 to 1.6; The refractive index of the second sub-light extraction layer is 1.8 to 2.

2.

7. The display panel according to claim 4, wherein, The light extraction layer further includes: The fourth sub-light extraction layer is disposed on the side of the third sub-light extraction layer away from the first electrode, and is located in the first optical microcavity region or the second optical microcavity region.

8. The display panel according to claim 4, wherein, The light extraction layer further includes: The fourth sub-light extraction layer is disposed on the side of the third sub-light extraction layer away from the first electrode, and is located in the first optical microcavity region and the second optical microcavity region.

9. The display panel according to claim 8, wherein, The thickness of the fourth sub-light extraction layer located in the first optical microcavity region is greater than the thickness of the fourth sub-light extraction layer located in the second optical microcavity region.

10. The display panel according to claim 8, wherein, The third sub-light extraction layer is located in the third optical microcavity region.

11. A display device, comprising a display panel, the display panel comprising: The display panel further includes a first optical microcavity region, a second optical microcavity region, and a third optical microcavity region; substrate; The first electrode is disposed on one side of the substrate; A light-emitting functional layer is disposed on the side of the first electrode away from the substrate; The second electrode is disposed on the side of the light-emitting functional layer away from the first electrode; and A light extraction layer is disposed on the side of the second electrode away from the first electrode; The thickness of the light extraction layer located in the third optical microcavity region is smaller than that of the light extraction layer located in the first optical microcavity region. The thickness of the light extraction layer in the optical microcavity region is less than the thickness of the light extraction layer in the second optical microcavity region.

12. The display device according to claim 11, wherein, The light-emitting functional layer includes: a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that display different colors; The peak of the emission spectrum of the first light-emitting unit is greater than the peak of the emission spectrum of the second light-emitting unit, and the peak of the emission spectrum of the second light-emitting unit is greater than the peak of the emission spectrum of the third light-emitting unit. The first light-emitting unit is disposed in the first optical microcavity region; The second light-emitting unit is disposed in the region corresponding to the second optical microcavity. The third light-emitting unit is disposed in the region corresponding to the third optical microcavity.

13. The display device according to claim 11, wherein, The thickness of the light extraction layer located in the first optical microcavity region is less than or equal to the thickness of the light extraction layer located in the second optical microcavity region; or... The thickness of the light extraction layer located in the first optical microcavity region is greater than the thickness of the light extraction layer located in the second optical microcavity region.

14. The display device according to claim 13, wherein, The light extraction layer includes: The first sub-light extraction layer is disposed on the side of the second electrode away from the first electrode, and is located in the first optical microcavity region, the second optical microcavity region and the third optical microcavity region; The second sub-light extraction layer is disposed on the side of the first sub-light extraction layer away from the first electrode, and is located in the first optical microcavity region, the second optical microcavity region, and the third optical microcavity region; The third sub-light extraction layer is disposed on the side of the second sub-light extraction layer away from the first electrode, and is located in the first optical microcavity region and / or the second optical microcavity region.

15. The display device according to claim 14, wherein, The refractive index of the first sub-light extraction layer is less than the refractive index of the second sub-light extraction layer; The refractive index of the third sub-light extraction layer is less than that of the second sub-light extraction layer.

16. The display device according to claim 15, wherein, The refractive index range of both the first sub-light extraction layer and the third sub-light extraction layer is 1.3 to 1.6; The refractive index of the second sub-light extraction layer is 1.8 to 2.

2.

17. The display device according to claim 14, wherein, The light extraction layer further includes: The fourth sub-light extraction layer is disposed on the side of the third sub-light extraction layer away from the first electrode, and is located in the first optical microcavity region or the second optical microcavity region.

18. The display device according to claim 14, wherein, The light extraction layer further includes: The fourth sub-light extraction layer is disposed on the side of the third sub-light extraction layer away from the first electrode, and is located in the first optical microcavity region and the second optical microcavity region.

19. The display device according to claim 18, wherein, The thickness of the fourth sub-light extraction layer located in the first optical microcavity region is greater than the thickness of the fourth sub-light extraction layer located in the second optical microcavity region.

20. The display device according to claim 18, wherein, The third sub-light extraction layer is located in the third optical microcavity region.

Images