Display panel and display device

Abstract

The application discloses a display panel and a display device. The display panel comprises a substrate, a light-emitting device and an encapsulation structure on the substrate; the encapsulation structure encapsulates the light-emitting device on the substrate; the encapsulation structure comprises a first inorganic encapsulation layer, the first inorganic encapsulation layer comprises a first inorganic encapsulation sub-layer, a second inorganic encapsulation sub-layer and a third inorganic encapsulation sub-layer which are stacked in sequence; the refractive index of the second inorganic encapsulation sub-layer is greater than the refractive index of the first inorganic encapsulation sub-layer, and the difference between the refractive index of the second inorganic encapsulation sub-layer and the refractive index of the first inorganic encapsulation sub-layer is greater than 0.1; the refractive index of the second inorganic encapsulation sub-layer is greater than the refractive index of the third inorganic encapsulation sub-layer, and the difference between the refractive index of the second inorganic encapsulation sub-layer and the refractive index of the third inorganic encapsulation sub-layer is greater than 0.1. In this way, the first inorganic encapsulation sub-layer, the second inorganic encapsulation sub-layer and the third inorganic encapsulation sub-layer cooperate with each other, the microcavity effect can be strengthened, and the light-emitting efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of display technology, specifically relating to display panels and display devices. Background Technology

[0002] With the continuous development of technology, display panels are being used more and more widely in various fields. Flexible display panels, due to their bendable characteristics, are gradually replacing rigid display panels. Display panels require the encapsulation of light-emitting devices. For flexible display panels, the traditional rigid encapsulation, which is mainly based on glass, needs to be transformed into flexible encapsulation, which is mainly based on thin-film encapsulation. Due to the difference between these two encapsulation structures, the light emission efficiency of the light-emitting devices in flexible display panels decreases by about 20%.

[0003] The most common improvement method is to add a lithium fluoride layer between the light-emitting device and the packaging to improve the light emission characteristics of the light-emitting device. However, the lithium fluoride layer is prone to problems such as film peeling and crystallization in the vapor deposition chamber, resulting in low production efficiency and high production costs.

[0004] Therefore, it is necessary to improve the existing display panels. Summary of the Invention

[0005] The present invention aims to improve at least one of the above-mentioned technical problems to some extent.

[0006] In one aspect of the present invention, a display panel is provided, the display panel including a substrate, and a light-emitting device and an encapsulation structure located on the substrate; the encapsulation structure seals the light-emitting device on the substrate; the encapsulation structure includes a first inorganic encapsulation layer, the first inorganic encapsulation layer including a first inorganic encapsulation sublayer, a second inorganic encapsulation sublayer, and a third inorganic encapsulation sublayer stacked sequentially; the encapsulation structure further includes a stacked organic encapsulation layer and a second inorganic encapsulation layer; the organic encapsulation layer is located between the first inorganic encapsulation layer and the second inorganic encapsulation layer; the light-emitting device includes a cathode, an anode, and a light-emitting layer located between the cathode and the anode; the refractive index of the second inorganic encapsulation sublayer is greater than the refractive index of the first inorganic encapsulation sublayer, and the difference between the refractive indices of the second and third inorganic encapsulation sublayers is greater than 0.1; the refractive index of the second inorganic encapsulation sublayer is greater than the refractive index of the third inorganic encapsulation sublayer, and the difference between the refractive indices of the second and third inorganic encapsulation sublayers is greater than 0.1. Thus, the first, second, and third inorganic encapsulation sublayers cooperate with each other to enhance the microcavity effect, thereby improving luminous efficiency. The first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer can provide multiple layers of protection for the light-emitting device, further preventing water and oxygen from entering the interior of the light-emitting device and extending its service life.

[0007] According to an embodiment of the present invention, the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the first inorganic encapsulation sublayer is greater than 0.6 and less than 1.5, and the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the third inorganic encapsulation sublayer is greater than 0.3 and less than 1.5. Therefore, the luminous efficiency can be further improved.

[0008] According to an embodiment of the present invention, the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the first inorganic encapsulation sublayer is greater than 0.9, and the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the third inorganic encapsulation sublayer is greater than 0.6. This further improves luminous efficiency.

[0009] According to an embodiment of the present invention, the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the first inorganic encapsulation sublayer is greater than the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the third inorganic encapsulation sublayer. Therefore, the microcavity effect can be further enhanced, thereby further improving the luminous efficiency.

[0010] According to an embodiment of the present invention, the thickness of the third inorganic encapsulation sublayer is greater than 5 times the thickness of the first inorganic encapsulation sublayer and greater than 3.3 times the thickness of the second inorganic encapsulation sublayer. This prevents water and oxygen from entering the interior of the light-emitting device, effectively protecting the device and further improving its luminous efficiency.

[0011] According to an embodiment of the present invention, the thickness of the third inorganic encapsulation sublayer is greater than 25 times the thickness of the first inorganic encapsulation sublayer and also greater than 25 times the thickness of the second inorganic encapsulation sublayer. This provides better protection for the light-emitting device.

[0012] According to an embodiment of the present invention, the first inorganic encapsulation sublayer has a refractive index of 1-1.6 and a thickness of 40-200 nm; the second inorganic encapsulation sublayer has a refractive index of 1.6-2.5 and a thickness of 40-300 nm; the third inorganic encapsulation sublayer has a refractive index of 1-2.2 and a thickness greater than or equal to 1000 nm; the materials forming the first, second, and third inorganic encapsulation sublayers are independently selected from SiO2, SiN, silicon oxynitride, Al2O3, or ZrO. This further improves the luminescence efficiency. Specifically, in the silicon oxynitride, based on the total weight of silicon oxynitride, the silicon content is 62.08%, the nitrogen content is 26.78%, and the oxygen content is 11.14%.

[0013] According to an embodiment of the present invention, the display panel further includes a light extraction layer, which is located between the light-emitting device and the encapsulation structure. The refractive index of the light extraction layer is greater than that of the first inorganic encapsulation sublayer, and the difference is greater than 0.2. Specifically, the first inorganic encapsulation sublayer is located between the light extraction layer and the second inorganic encapsulation sublayer. Thus, the light extraction layer, the first inorganic encapsulation sublayer, the second inorganic encapsulation sublayer, and the third inorganic encapsulation sublayer are sequentially stacked on one side of the light-emitting device. These layered structures cooperate with each other to further improve the light emission efficiency.

[0014] According to an embodiment of the present invention, the difference between the refractive index of the light extraction layer and the refractive index of the first inorganic encapsulation sublayer is greater than 0.8. This further improves the luminous efficiency.

[0015] According to an embodiment of the present invention, the light extraction layer is located on the side of the cathode away from the light-emitting layer; the refractive index of the light extraction layer is greater than 1.8, and the thickness of the light extraction layer is less than 150 nm. Therefore, the light extraction layer can improve the light extraction efficiency, further improving the luminous efficiency.

[0016] According to an embodiment of the present invention, the first inorganic encapsulation layer further includes a fourth inorganic encapsulation sublayer, which is located between the third inorganic encapsulation sublayer and the organic encapsulation layer. The refractive index of the third inorganic encapsulation sublayer is greater than that of the fourth inorganic encapsulation sublayer, and the difference between their refractive indices is greater than 0.1. The refractive index of the fourth inorganic encapsulation sublayer is greater than that of the organic encapsulation layer, and the difference between their refractive indices is greater than 0.1. This further improves the efficiency of light emission.

[0017] In another aspect, the present invention also provides a method for manufacturing a display panel, the method comprising: providing a substrate; forming a light-emitting device on one side of the substrate; and forming an encapsulation structure on the side of the light-emitting device away from the substrate, the encapsulation structure comprising a first inorganic encapsulation layer, the first inorganic encapsulation layer comprising a first inorganic encapsulation sublayer, a second inorganic encapsulation sublayer, and a third inorganic encapsulation sublayer stacked sequentially; the refractive index of the second inorganic encapsulation sublayer being greater than the refractive index of the first inorganic encapsulation sublayer, and the difference between the refractive indices of the second and third inorganic encapsulation sublayers being greater than 0.1; and the refractive index of the second inorganic encapsulation sublayer being greater than the refractive index of the third inorganic encapsulation sublayer, and the difference between the refractive indices of the second and third inorganic encapsulation sublayers being greater than 0.1. Thus, the display panel manufactured by this method possesses all the features and advantages of the display panel described above, which will not be repeated here. Furthermore, this method also has the advantage of being simple to operate.

[0018] According to an embodiment of the present invention, forming an encapsulation structure on the side of the light-emitting device away from the substrate includes: forming a first inorganic encapsulation sublayer on the side of the light-emitting device away from the substrate; forming a second inorganic encapsulation sublayer on the side of the first inorganic encapsulation sublayer away from the light-emitting device; and forming a third inorganic encapsulation sublayer on the side of the second inorganic encapsulation sublayer away from the first inorganic encapsulation sublayer. Thus, the first, second, and third inorganic encapsulation sublayers can be sequentially stacked on the side of the light-emitting device away from the substrate, effectively protecting the light-emitting device, preventing water and oxygen from entering the interior of the light-emitting device, and improving the light-emitting efficiency.

[0019] Furthermore, the first inorganic encapsulation sublayer, the second inorganic encapsulation sublayer, and the third inorganic encapsulation sublayer are formed in the same or different ways, and are independently selected from chemical vapor deposition, atomic layer deposition, or plasma-enhanced chemical vapor deposition.

[0020] The present invention also provides a display device comprising the display panel described above. It should be noted that this display device possesses all the features and advantages of the display panel described above, and will not be repeated here. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the display panel in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the display panel structure in another embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the display panel structure in another embodiment of the present invention;

[0024] Figure 4 This is a scanning electron microscope image of a light-emitting device having a first inorganic encapsulation layer formed, according to another embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of a display panel in the prior art;

[0026] Figure 6 This is a flowchart of a method for manufacturing a display panel according to one embodiment of the present invention;

[0027] Figure 7 This is a flowchart of a method for manufacturing a display panel in another embodiment of the present invention.

[0028] Figure Labels

[0029] 100 - Substrate, 200 - Light-emitting device, 300 - Packaging structure, 400 - Light extraction layer, 500 - Lithium fluoride layer, 210 - Anode, 220 - Light-emitting layer, 230 - Cathode, 310 - First inorganic packaging layer, 320 - Organic packaging layer, 330 - Second inorganic packaging layer, 311 - First inorganic packaging sublayer, 312 - Second inorganic packaging sublayer, 313 - Third inorganic packaging sublayer, 314 - Fourth inorganic packaging sublayer. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the art or according to the product instructions. Reagents used, unless otherwise specified, are all conventional products that can be purchased from the market.

[0031] The inventors discovered that the lithium fluoride layer in display panels is prone to problems such as film peeling and crystallization in the vapor deposition chamber, resulting in low production efficiency and high production costs. Existing packaging structures involve placing multiple alternating inorganic and organic film layers above the light-emitting device to prevent water and oxygen from entering the device and extend its lifespan. The inventors found that by setting one inorganic film layer near the light-emitting device as multiple stacked inorganic film layers with specific refractive indices, the multiple stacked inorganic film layers work together to effectively improve the light emission characteristics of the device and increase its luminous efficiency.

[0032] This invention provides a display panel, referenced Figure 1The display panel includes a substrate 100, a light-emitting device 200 and an encapsulation structure 300 located on the substrate 100, the encapsulation structure 300 sealing the light-emitting device 200 on the substrate 100. The light-emitting device 200 includes a cathode 230, an anode 210, and a light-emitting layer 220 located between the cathode 230 and the anode 210. The encapsulation structure 300 includes a first inorganic encapsulation layer 310, an organic encapsulation layer 320 and a second inorganic encapsulation layer 330, the first inorganic encapsulation layer 310 including a first inorganic encapsulation sublayer 311, a second inorganic encapsulation sublayer 312 and a third inorganic encapsulation sublayer 313 stacked sequentially. The refractive index of the second inorganic encapsulation sublayer 312 is greater than that of the first inorganic encapsulation sublayer 311, and the difference between their refractive indices is greater than 0.1. Similarly, the refractive index of the second inorganic encapsulation sublayer 312 is greater than that of the third inorganic encapsulation sublayer 313, and the difference between their refractive indices is greater than 0.1. A microcavity effect exists in the display panel. The inventors discovered that if the difference in refractive indices is less than 0.1, the microcavity effect cannot be significantly enhanced. When the difference in refractive indices is greater than 0.1, the microcavity effect can be significantly enhanced, thereby improving the light emission efficiency. Furthermore, the larger the difference in refractive indices, the better the effect on improving light emission efficiency. Therefore, the first inorganic encapsulation sublayer 311, the second inorganic encapsulation sublayer 312, and the third inorganic encapsulation sublayer 313 of this invention cooperate to enhance reflection at the interface, thereby feeding back the light emitted from the microcavity into the microcavity, producing a stronger microcavity enhancement effect. The first inorganic encapsulation layer 310, the organic encapsulation layer 320, and the second inorganic encapsulation layer 330 provide multiple layers of protection for the light-emitting device 200, preventing water and oxygen from entering the interior of the light-emitting device 200 and further extending the lifespan of the display panel. This invention effectively improves luminous efficiency and reduces power consumption without using a lithium fluoride layer, and also has the advantages of high production efficiency and low production cost.

[0033] It should be noted that the first inorganic encapsulation layer 310 may include at least three sequentially stacked sublayer structures. The refractive index of the first three sublayers in the direction from the side of the first inorganic encapsulation layer 310 toward the substrate to the side away from the substrate must meet the aforementioned requirements. The number of sublayers included in the first inorganic encapsulation layer 310 may be greater than or equal to three. Under the premise of meeting the aforementioned requirements, those skilled in the art can adjust the specific structure of the first inorganic encapsulation layer 310 and other parts of the encapsulation structure according to the actual requirements of the display panel.

[0034] According to an embodiment of the present invention, the difference between the refractive index of the second inorganic encapsulation sublayer 312 and the refractive index of the first inorganic encapsulation sublayer 311 is greater than 0.6 and less than 1.5, and the difference between the refractive index of the second inorganic encapsulation sublayer 312 and the refractive index of the third inorganic encapsulation sublayer 313 is greater than 0.3 and less than 1.5. Therefore, the luminous efficiency can be further improved.

[0035] According to an embodiment of the present invention, the difference between the refractive index of the second inorganic encapsulation sublayer 312 and the refractive index of the first inorganic encapsulation sublayer 313 is greater than 0.9, and the difference between the refractive index of the second inorganic encapsulation sublayer 312 and the refractive index of the third inorganic encapsulation sublayer 313 is greater than 0.6. This further improves the luminous efficiency.

[0036] According to an embodiment of the present invention, the difference between the refractive index of the second inorganic encapsulation sublayer 312 and the refractive index of the first inorganic encapsulation sublayer 313 is greater than the difference between the refractive index of the second inorganic encapsulation sublayer 312 and the refractive index of the third inorganic encapsulation sublayer 313. Since the layered structure closer to the cathode plays a greater role in the microcavity device, the above structure can further enhance the microcavity effect and further improve the luminous efficiency.

[0037] According to an embodiment of the present invention, the thickness of the third inorganic encapsulation sublayer 313 is greater than 5 times the thickness of the first inorganic encapsulation sublayer 311 and greater than 3.3 times the thickness of the second inorganic encapsulation sublayer 312. Therefore, while ensuring luminous efficiency, better protection of the light-emitting device can be provided, preventing water and oxygen from entering the interior of the light-emitting device.

[0038] According to an embodiment of the present invention, the thickness of the third inorganic packaging sublayer 313 is 25 times greater than the thickness of the first inorganic packaging sublayer 311 and 25 times greater than the thickness of the second inorganic packaging sublayer 312. This provides better protection for the light-emitting device.

[0039] According to an embodiment of the present invention, the first inorganic encapsulation sublayer 311 has a refractive index of 1-1.6 and a thickness of 40-200 nm. The second inorganic encapsulation sublayer 312 has a refractive index of 1.6-2.5 and a thickness of 40-300 nm. The third inorganic encapsulation sublayer 313 has a refractive index of 1-2.2 and a thickness greater than or equal to 1000 nm. This further improves luminous efficiency and provides better protection for the light-emitting device.

[0040] According to embodiments of the present invention, the materials forming the first inorganic encapsulation sublayer 311, the second inorganic encapsulation sublayer 312, and the third inorganic encapsulation sublayer 313 are independently selected from SiO2, SiN, silicon oxynitride, Al2O3, or ZrO. Specifically, in the silicon oxynitride, based on the total weight of the silicon oxynitride, the silicon content is 62.08%, the nitrogen content is 26.78%, and the oxygen content is 11.14%.

[0041] Furthermore, the refractive index of the SiO2 is 1.46-1.5. The refractive index of the SiN is 1.85-1.9. The refractive index of the silicon oxynitride is 1.75-1.8.

[0042] Furthermore, when the materials forming the first inorganic packaging sublayer 311, the second inorganic packaging sublayer 312, and the third inorganic packaging sublayer 313 are selected from SiO2, SiN, or silicon oxynitride, the N content in the material of the second inorganic packaging sublayer 312 is greater than the N content in the material of the first inorganic packaging sublayer 311, and the N content in the material of the second inorganic packaging sublayer 312 is greater than the N content in the material of the third inorganic packaging sublayer 313.

[0043] According to an embodiment of the present invention, reference Figure 2 The display panel further includes a light extraction layer 400, which is located between the light-emitting device 200 and the encapsulation structure 300. The refractive index of the light extraction layer 400 is greater than that of the first inorganic encapsulation sublayer 311, and the difference is greater than 0.2. The light extraction layer 400 can suppress the surface plasmon polariton (SPP) effect on the cathode 230 surface of the light-emitting device 200, improve the efficiency of emitted light, and further enhance the luminous efficiency.

[0044] According to an embodiment of the present invention, the difference between the refractive index of the light extraction layer 400 and the refractive index of the first inorganic encapsulation sublayer 311 is greater than 0.8. This further improves the luminous efficiency.

[0045] According to an embodiment of the present invention, the light extraction layer 400 is located on the side of the cathode 230 away from the light-emitting layer 220, the refractive index of the light extraction layer 400 is greater than 1.8, and the thickness of the light extraction layer 400 is less than 150 nm. This further improves the luminous efficiency.

[0046] Furthermore, the first inorganic encapsulation sublayer 311 is located between the light extraction layer 400 and the second inorganic encapsulation sublayer 312. Thus, the light extraction layer 400, together with the first inorganic encapsulation sublayer 311, the second inorganic encapsulation sublayer 312, and the third inorganic encapsulation sublayer 313 disposed above it, can further improve the luminous efficiency.

[0047] This invention enhances the microcavity effect by stacking a three-layer sublayer structure above the light extraction layer 400, satisfying the specific refractive index conditions described above. This allows light emitted from the microcavity to undergo multiple interface reflections before reaching the microcavity interior. The inventors discovered that placing one or two sublayer structures above the light extraction layer 400 results in a weaker microcavity effect and lower luminous efficiency compared to the three-layer structure. Specifically, the microcavity device consists of an anode and a cathode module. The cathode module includes a cathode, a light extraction layer, and various layered structures located on the side of the light extraction layer furthest from the cathode for light extraction. Among these layered structures, those closer to the cathode have a greater impact on the module. Furthermore, the cathode module needs to balance reflectivity and transmittance. Higher reflectivity results in more enhanced light within the microcavity, and the overall light extraction efficiency is determined by the transmittance. The three-layer sublayer structure is positioned in a more balanced microcavity location than the two-layer structure, resulting in a more reasonable ratio of reflectivity to transmittance, thus improving efficiency.

[0048] According to an embodiment of the present invention, reference Figure 3 The first inorganic encapsulation layer 310 also includes a fourth inorganic encapsulation sublayer 314, which is located between the third inorganic encapsulation sublayer 313 and the organic encapsulation layer 320. This further improves luminous efficiency.

[0049] Furthermore, the refractive index of the third inorganic encapsulation sublayer 313 is greater than that of the fourth inorganic encapsulation sublayer 314, and the difference between their refractive indices is greater than 0.1. The refractive index of the fourth inorganic encapsulation sublayer 314 is greater than that of the organic encapsulation layer 320, and the difference between their refractive indices is also greater than 0.1. This further enhances the microcavity effect, thereby improving luminous efficiency.

[0050] Furthermore, the material forming the fourth inorganic encapsulation sublayer can be SiO2, SiN, silicon oxynitride, Al2O3, or ZrO. This invention also provides a method for fabricating a display panel, see reference... Figure 6 The method includes:

[0051] S100, providing substrate

[0052] In this step, a substrate is provided. The present invention does not limit the material used to form the substrate; those skilled in the art can choose according to their application requirements.

[0053] S200, A light-emitting device is formed on one side of the substrate.

[0054] In this step, a light-emitting device is formed on one side of the substrate. Specifically, the light-emitting device includes an anode, a light-emitting layer, and a cathode stacked together. This invention does not limit the materials used to form the anode, the light-emitting layer, and the cathode; those skilled in the art can select them according to their needs.

[0055] S300, A packaging structure is formed on the side of the light-emitting device away from the substrate.

[0056] In this step, an encapsulation structure is formed on the side of the light-emitting device away from the substrate. This encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked together. The first inorganic encapsulation layer includes a first inorganic encapsulation sublayer, a second inorganic encapsulation sublayer, and a third inorganic encapsulation sublayer stacked sequentially. Further, the refractive index of the second inorganic encapsulation sublayer is greater than that of the first inorganic encapsulation sublayer, and the difference between their refractive indices is greater than 0.1. The refractive index of the second inorganic encapsulation sublayer is also greater than that of the third inorganic encapsulation sublayer, and the difference between their refractive indices is greater than 0.1.

[0057] Therefore, the display panel prepared by this method has all the features and advantages of the display panel described above, which will not be repeated here.

[0058] According to an embodiment of the present invention, reference Figure 7 Forming an encapsulation structure on the side of the light-emitting device away from the substrate includes:

[0059] S310, A first inorganic encapsulation sublayer is formed on the side of the light-emitting device away from the substrate.

[0060] In this step, a first inorganic encapsulation sublayer is formed on the side of the light-emitting device away from the substrate. Specifically, a light extraction layer is also provided on the side of the light-emitting device away from the substrate. Before forming the first inorganic encapsulation sublayer, the method further includes the step of forming a light extraction layer on the side of the light-emitting device away from the substrate, and then forming the first inorganic encapsulation sublayer on the side of the light extraction layer away from the light-emitting device.

[0061] S320, a second inorganic packaging sublayer is formed on the side of the first inorganic packaging sublayer away from the light-emitting device.

[0062] In this step, a second inorganic encapsulation sublayer is formed on the side of the first inorganic encapsulation sublayer away from the light-emitting device. The second inorganic encapsulation sublayer is disposed on the side of the first inorganic encapsulation sublayer away from the light extraction layer.

[0063] S330, a third inorganic packaging sublayer is formed on the side of the second inorganic packaging sublayer away from the first inorganic packaging sublayer.

[0064] In this step, a third inorganic encapsulation sublayer is formed on the side of the second inorganic encapsulation sublayer away from the first inorganic encapsulation sublayer. Thus, the first, second, and third inorganic encapsulation sublayers can be sequentially stacked on the side of the light-emitting device away from the substrate, effectively protecting the light-emitting device and preventing water and oxygen from entering its interior. Furthermore, the first, second, and third inorganic encapsulation sublayers can be formed using the same or different methods, independently selected from chemical vapor deposition, atomic layer deposition, or plasma-enhanced chemical vapor deposition.

[0065] Furthermore, after step S330, the method further includes the steps of forming an organic encapsulation layer on the side of the third inorganic encapsulation sublayer away from the second inorganic encapsulation sublayer, and forming a second inorganic encapsulation layer on the side of the organic encapsulation layer away from the third inorganic encapsulation sublayer. Thus, the organic encapsulation layer and the second inorganic encapsulation layer provide better protection for the light-emitting device, preventing water and oxygen from entering the interior of the light-emitting device and affecting its lifespan.

[0066] Furthermore, after step S330, the method may further include: forming a fourth inorganic encapsulation sublayer on the side of the third inorganic encapsulation sublayer away from the second inorganic encapsulation sublayer, and subsequently forming an organic encapsulation layer on the side of the fourth inorganic encapsulation sublayer away from the third inorganic encapsulation sublayer, and forming a second inorganic encapsulation layer on the side of the organic encapsulation layer away from the fourth inorganic encapsulation sublayer. Thus, by providing the fourth inorganic encapsulation sublayer, the luminous efficiency can be further improved.

[0067] Technicians can adjust the refractive index of silicon oxynitride according to usage requirements. For example, when the material forming the first, second, or third inorganic encapsulation sublayer is silicon oxynitride, it can be formed by chemical vapor deposition. Specifically, by adjusting the intake flow rates of the nitrogen source (NH3, N2O, N2), oxygen source (N2O), silicon source (SiH4), and other gases (H2, etc.), the ratio of nitrogen, oxygen, and silicon in the formed silicon oxynitride can be adjusted, thereby adjusting the refractive index of the formed silicon oxynitride.

[0068] The present invention also provides a display device comprising the display panel described above. It should be noted that this display device possesses all the features and advantages of the display panel described above, and will not be repeated here. In general, this display device can effectively improve the efficiency of light emission.

[0069] Example 1

[0070] A substrate 100 is provided, and a light-emitting device 200 is formed on one side of the substrate 100. The light-emitting device 200 includes an anode 210, a light-emitting layer 220 and a cathode 230 stacked together.

[0071] A light extraction layer 400 is formed on the side of the light-emitting device 200 away from the substrate 100. Subsequently, a first inorganic encapsulation sublayer 311 is formed on the side of the light extraction layer 400 away from the light-emitting device 200. The material of the first inorganic encapsulation sublayer 311 is SiO2, and the thickness of the first inorganic encapsulation sublayer 311 is 90 nm. A second inorganic encapsulation sublayer 312 is formed on the side of the first inorganic encapsulation sublayer 311 away from the light extraction layer 400. The material of the second inorganic encapsulation sublayer 312 is SiN, and the thickness of the second inorganic encapsulation sublayer 312 is 60 nm. A third inorganic encapsulation sublayer 313 is formed on the side of the second inorganic encapsulation sublayer 312 away from the first inorganic encapsulation sublayer 311. The material of the third inorganic encapsulation sublayer 313 is silicon oxynitride. Specifically, in the silicon oxynitride, based on the total weight of the silicon oxynitride, the silicon content is 62.08%, the nitrogen content is 26.78%, and the oxygen content is 11.14%. The thickness of the third inorganic encapsulation sublayer 313 is approximately 1 μm. The first inorganic encapsulation sublayer 311, the second inorganic encapsulation sublayer 312, and the third inorganic encapsulation sublayer 313 are all formed using chemical vapor deposition.

[0072] refer to Figure 4 It can be seen that above the light-emitting layer 220 are a cathode 230, a light extraction layer 400, a first inorganic encapsulation sublayer 311, a second inorganic encapsulation sublayer 312, and a third inorganic encapsulation sublayer 313 stacked sequentially. Figure 6 In this context, EL refers to the light-emitting layer 220, CTD refers to the cathode 230, CPL refers to the light extraction layer 400, CVD1-1 refers to the first inorganic encapsulation sublayer 311, CVD1-2 refers to the second inorganic encapsulation sublayer 312, and CVD1-3 refers to the third inorganic encapsulation sublayer 313.

[0073] Subsequently, an organic encapsulation layer 320 is formed on the side of the third inorganic encapsulation sublayer 313 away from the second inorganic encapsulation sublayer 312, and a second inorganic encapsulation layer 330 is formed on the side of the organic encapsulation layer 320 away from the third inorganic encapsulation sublayer 313, thus obtaining a display panel. The structure of the display panel is as follows: Figure 2 As shown. The methods for forming the organic encapsulation layer 320 and the second inorganic encapsulation layer 330 are both chemical vapor deposition.

[0074] Comparative Example 1

[0075] The display panel was prepared according to the method of Example 1. The difference lies in that a lithium fluoride layer 500 is formed on the side of the light extraction layer 400 away from the substrate 100, and subsequently, a first inorganic encapsulation layer 310 is formed on the side of the lithium fluoride layer 500 away from the light extraction layer 400. The thickness of the first inorganic encapsulation layer 310 is approximately 1 μm. The first inorganic encapsulation layer in Comparative Example 1 differs from that in Example 1. Specifically, the first inorganic encapsulation layer in Comparative Example 1 consists of a single layer, while the first inorganic encapsulation layer in Example 1 consists of a three-layer stacked structure.

[0076] Subsequently, an organic encapsulation layer 320 and a second inorganic encapsulation layer 330 are formed on the side of the first inorganic encapsulation layer 310 away from the light extraction layer 400. This step is the same as in Embodiment 1, resulting in a display panel. The structure of the display panel is as follows: Figure 5 As shown.

[0077] The luminous efficiency of the display panels prepared in Example 1 and Comparative Example 1 was tested, and the test results are shown in Table 1 below.

[0078] Table 1

[0079]

[0080] Wherein, B, G, R, and W refer to blue light, green light, red light, and white light, respectively; CIE-x refers to the x-value of the color coordinate; and CIE-y refers to the y-value of the color coordinate.

[0081] As can be seen from Table 1, the color coordinates of Example 1 and Comparative Example 1 are similar, and therefore can be used for comparison. Furthermore, the luminous efficiency of the blue, green, red, and white light emitted by the display panel of Example 1 is significantly higher than that of Comparative Example 1, indicating that the display panel of this application can significantly improve luminous efficiency compared to existing display panels.

[0082] Without contradiction, those skilled in the art can combine and integrate the different examples and features described in this specification. Furthermore, it should be noted that the terms "first," "second," "third," and "fourth" 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.

[0083] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A display panel, characterized in that, The display panel includes a substrate, and light-emitting devices and packaging structures located on the substrate; The packaging structure seals the light-emitting device onto the substrate; The encapsulation structure includes a first inorganic encapsulation layer, which includes a first inorganic encapsulation sublayer, a second inorganic encapsulation sublayer, and a third inorganic encapsulation sublayer stacked sequentially. The encapsulation structure further includes a stacked organic encapsulation layer and a second inorganic encapsulation layer. The organic encapsulation layer is located between the first inorganic encapsulation layer and the second inorganic encapsulation layer; The light-emitting device includes a cathode, an anode, and a light-emitting layer located between the cathode and the anode; The refractive index of the second inorganic encapsulation sublayer is greater than that of the first inorganic encapsulation sublayer, and the refractive index of the second inorganic encapsulation sublayer is greater than that of the third inorganic encapsulation sublayer. The difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the first inorganic encapsulation sublayer is greater than the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the third inorganic encapsulation sublayer. The thickness of the third inorganic packaging sublayer is greater than 5 times the thickness of the first inorganic packaging sublayer and greater than 3.3 times the thickness of the second inorganic packaging sublayer. The difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the first inorganic encapsulation sublayer is greater than 0.9 and less than 1.5, and the difference between the refractive index of the second inorganic encapsulation sublayer and the refractive index of the third inorganic encapsulation sublayer is greater than 0.6 and less than 1.

5. The first inorganic encapsulation layer further includes a fourth inorganic encapsulation sublayer, which is located between the third inorganic encapsulation sublayer and the organic encapsulation layer; The refractive index of the third inorganic encapsulation sublayer is greater than that of the fourth inorganic encapsulation sublayer, and the difference between the refractive indices of the third inorganic encapsulation sublayer and the fourth inorganic encapsulation sublayer is greater than 0.

1. The refractive index of the fourth inorganic encapsulation sublayer is greater than that of the organic encapsulation layer, and the difference between the refractive indices of the fourth inorganic encapsulation sublayer and the organic encapsulation layer is greater than 0.

1.

2. The display panel according to claim 1, characterized in that, The thickness of the third inorganic packaging sublayer is 25 times greater than the thickness of the first inorganic packaging sublayer and 25 times greater than the thickness of the second inorganic packaging sublayer.

3. The display panel according to claim 1, characterized in that, The first inorganic encapsulation sublayer has a refractive index of 1-1.6 and a thickness of 40-200 nm; The refractive index of the second inorganic encapsulation sublayer is 1.6-2.5, and the thickness is 40-300 nm; The refractive index of the third inorganic encapsulation sublayer is 1-2.2, and the thickness is greater than or equal to 1000 nm; The materials forming the first inorganic encapsulation sublayer, the second inorganic encapsulation sublayer, and the third inorganic encapsulation sublayer are independently selected from SiO2, SiN, silicon oxynitride, Al2O3, or ZrO.

4. The display panel according to any one of claims 1-3, characterized in that, The display panel further includes a light extraction layer, which is located between the light-emitting device and the encapsulation structure. The refractive index of the light extraction layer is greater than that of the first inorganic encapsulation sublayer, and the difference is greater than 0.

2.

5. The display panel according to claim 4, characterized in that, The difference between the refractive index of the light extraction layer and the refractive index of the first inorganic encapsulation sublayer is greater than 0.

8.

6. The display panel according to claim 4, characterized in that, The light extraction layer is located on the side of the cathode away from the light-emitting layer; the refractive index of the light extraction layer is greater than 1.8, and the thickness of the light extraction layer is less than 150 nm.

7. A display device, characterized in that, The display device includes the display panel as described in any one of claims 1-6.

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