Display panel and display device

Abstract

Embodiments of the present application disclose a display panel and a display device, the display panel comprising a light-emitting layer and an encapsulation layer, the light-emitting layer comprising a plurality of pixel units, the encapsulation layer being located on a light-emitting side of the light-emitting layer, the encapsulation layer comprising a first inorganic layer and a first organic layer, the first organic layer being located on a side of the first inorganic layer away from the light-emitting layer, the first inorganic layer comprising a first sub-layer and a second sub-layer, the second sub-layer being located between the first sub-layer and the first organic layer, the refractive index of the first sub-layer being greater than the refractive index of the second sub-layer, and the thickness of the first sub-layer being less than the thickness of the second sub-layer, by arranging the first sub-layer and the second sub-layer in the first inorganic layer of the encapsulation layer of the display panel, the refractive index of the first sub-layer and the second sub-layer decreases in turn, and the thickness of the first sub-layer is less than the thickness of the second sub-layer, thereby improving the display effect of the display panel while improving the light-emitting rate of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display, in particular to a display panel and a display device. BACKGROUND

[0002] Organic light-emitting diode (OLED) products are widely used due to their self-luminescence, wide color gamut, low power consumption, and flexible display. At present, the inorganic-organic-inorganic encapsulation method is adopted in the encapsulation layer provided on the light-emitting side of the pixel unit of the OLED display panel. Since the inorganic layer in the encapsulation layer is formed by chemical vapor deposition, the film uniformity is poor, which leads to a significant difference in the thickness of the inorganic layer between the center and the edge of the display panel, and there are technical problems such as display defects.

[0003] Therefore, there is an urgent need for a display panel and a display device to solve the above technical problems. SUMMARY

[0004] The present application provides a display panel and a display device, which can alleviate the current technical problem of display defects caused by the difference in the thickness of the inorganic layer in the encapsulation layer between the center and the edge.

[0005] The present application provides a display panel, comprising:

[0006] a light-emitting layer;

[0007] an encapsulation layer located on the light-emitting side of the light-emitting layer, the encapsulation layer comprising a first inorganic layer and a first organic layer, the first organic layer being located on the side of the first inorganic layer away from the light-emitting layer;

[0008] wherein the first inorganic layer comprises a first sub-layer and a second sub-layer, the second sub-layer being located between the first sub-layer and the first organic layer, the refractive index of the first sub-layer being greater than the refractive index of the second sub-layer, and the thickness of the first sub-layer being less than the thickness of the second sub-layer.

[0009] In some embodiments, the extinction coefficient of the second sub-layer in the visible light region is less than or equal to the extinction coefficient of the first sub-layer in the visible light region.

[0010] In some embodiments, the ratio of the thickness of the second sub-layer to the thickness of the first sub-layer is greater than or equal to 3:1.

[0011] In some embodiments, the thickness of the second sub-layer is greater than or equal to 600 nanometers.

[0012] In some embodiments, the display panel further comprises a cathode layer between the light-emitting layer and the encapsulation layer, the first sub-layer is in contact with the cathode layer on a side close to the cathode layer, and a thickness of the first sub-layer is less than or equal to 100 nanometers.

[0013] In some embodiments, the display panel further comprises a cathode layer between the light-emitting layer and the encapsulation layer, and a light-extraction layer between the cathode layer and the encapsulation layer, the first sub-layer is in contact with the light-extraction layer on a side close to the light-extraction layer, and a thickness of the first sub-layer is less than or equal to 200 nanometers.

[0014] In some embodiments, a sum of a thickness of the light-extraction layer and a thickness of the first sub-layer is greater than or equal to 60 nanometers, and the sum of the thickness of the light-extraction layer and the thickness of the first sub-layer is less than or equal to 100 nanometers.

[0015] In some embodiments, the display panel further comprises a cathode layer between the light-emitting layer and the encapsulation layer, a light-extraction layer between the cathode layer and the encapsulation layer, and an adjustment layer between the light-extraction layer and the encapsulation layer.

[0016] In some embodiments, a refractive index of the adjustment layer is less than a refractive index of the light-extraction layer, and the refractive index of the adjustment layer is less than a refractive index of the first sub-layer.

[0017] In some embodiments, the refractive index of the adjustment layer is less than 1.6.

[0018] In some embodiments, the first inorganic layer further comprises a third sub-layer between the second sub-layer and the first organic layer, a refractive index of the third sub-layer is less than a refractive index of the second sub-layer, the refractive index of the third sub-layer is greater than or equal to a refractive index of the first organic layer, and a thickness of the third sub-layer is less than a thickness of the second sub-layer.

[0019] In some embodiments, an extinction coefficient of the third sub-layer in a visible light region is less than an extinction coefficient of the first sub-layer in the visible light region.

[0020] In some embodiments, a difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer is greater than 0, and the difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer is less than 0.2.

[0021] A difference between the refractive index of the second sub-layer and the refractive index of the third sub-layer is greater than 0, and the difference between the refractive index of the second sub-layer and the refractive index of the third sub-layer is less than 0.2.

[0022] In some embodiments, the refractive index of the first sub-layer is greater than 1.8.

[0023] The refractive index of the second sub-layer is greater than 1.7, and the refractive index of the second sub-layer is less than 1.95.

[0024] The refractive index of the third sub-layer is greater than 1.6, and the refractive index of the third sub-layer is less than 1.76.

[0025] In some embodiments, the oxygen element content of the first sub-layer is less than or equal to the oxygen element content of the second sub-layer, and the oxygen element content of the second sub-layer is less than or equal to the oxygen element content of the third sub-layer.

[0026] In some embodiments, the oxygen element content of the first sub-layer is less than 1%.

[0027] In some embodiments, the material of the first sub-layer is selected from a nitrogen silicon compound, the material of the second sub-layer is selected from a nitrogen silicon compound or a nitrogen oxygen silicon compound, and the material of the third sub-layer is selected from a nitrogen oxygen silicon compound.

[0028] In some embodiments, the encapsulation layer further comprises a second inorganic layer, and the second inorganic layer is located on the side of the first organic layer away from the first inorganic layer.

[0029] The extinction coefficient of the second inorganic layer in the visible light region is less than 0.01.

[0030] The present application also provides a display device comprising the display panel as described above.

[0031] The present application sets the first sub-layer and the second sub-layer in the first inorganic layer of the encapsulation layer of the display panel, the refractive index of the first sub-layer and the second sub-layer decreases in turn, and the thickness of the first sub-layer is less than the thickness of the second sub-layer, thereby improving the display effect of the display panel while improving the light extraction efficiency of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a structural schematic diagram of a first structure of a display panel provided by the embodiments of the present application;

[0034] Figure 2 is a structural schematic diagram of a second structure of a display panel provided by the embodiments of the present application;

[0035] Figure 3 is a structural schematic diagram of a third structure of a display panel provided by the embodiments of the present application;

[0036] Figure 4 FIG. 4 is a structural schematic diagram of a fourth structure of a display panel provided by an embodiment of the present application;

[0037] Figure 5 FIG. 5 is a structural schematic diagram of a display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, any other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as 'up' and 'down' generally refer to the up and down in the actual use or working state of the device, and specifically refer to the direction of the drawing in the drawings; and 'inner' and 'outer' refer to the outline of the device.

[0039] At present, there are technical problems such as display defects of white ring and white powder, because the thickness of the inorganic layer in the packaging layer of the display panel has obvious difference between the center and the edge of the display panel.

[0040] Referring to Figures 1 to 4 The embodiment of the present application provides a display panel 100, which comprises:

[0041] a light-emitting layer 101;

[0042] a packaging layer 103 located on the light-emitting side of the light-emitting layer 101, wherein the packaging layer 103 comprises a first inorganic layer 104 and a first organic layer 105, and the first organic layer 105 is located on the side of the first inorganic layer 104 away from the light-emitting layer 101;

[0043] wherein the first inorganic layer 104 comprises a first sub-layer 106 and a second sub-layer 107, the second sub-layer 107 is located between the first sub-layer 106 and the first organic layer 105, and the refractive index of the first sub-layer 106 is greater than the refractive index of the second sub-layer 107;

[0044] The thickness of the first sub-layer is less than the thickness of the second sub-layer.

[0045] The embodiment of the present application sets the first sub-layer 106 and the second sub-layer 107 in the first inorganic layer 104 in the packaging layer 103 of the display panel 100, the refractive indexes of the first sub-layer 106 and the second sub-layer 107 decrease in turn, and the thickness of the first sub-layer 106 is less than the thickness of the second sub-layer 107, thereby improving the display effect of the display panel 100 while improving the light output rate of the display panel 100.

[0046] The technical solutions of the present application will be described in detail in combination with specific embodiments.

[0047] In some embodiments, the extinction coefficient of the second sub-layer 107 in the visible light region is less than or equal to the extinction coefficient of the first sub-layer 106 in the visible light region, preferably, the extinction coefficient of the second sub-layer 107 in the visible light region is less than the extinction coefficient of the first sub-layer 106 in the visible light region. The light-emitting layer 101 includes a plurality of pixel units 102, and since the thickness of the second sub-layer 107 is greater than the thickness of the first sub-layer 106, adjusting the extinction coefficient of the second sub-layer 107 in the visible light region to be less than or equal to the extinction coefficient of the first sub-layer 106 in the visible light region is beneficial to reducing the loss of light emitted by the pixel unit 102 to the second sub-layer 107, and improving the light output rate of the display panel 100. The visible light region refers to a wavelength region with a wavelength of 380-780 nm.

[0048] In some embodiments, the extinction coefficient of the second sub-layer 107 in the visible light region is less than 0.01, and the extinction coefficient of the second sub-layer 107 in the visible light region is greater than or equal to 0, for example, it can be 0.0001, 0.0002, 0.0005, 0.0008, 0.001, 0.002, 0.005, 0.006, 0.008, etc.

[0049] In some embodiments, the extinction coefficient of the first sub-layer 106 in the visible light region is less than 0.01, and the extinction coefficient of the first sub-layer 106 in the visible light region is greater than or equal to 0, for example, it can be 0.0001, 0.0002, 0.0005, 0.0008, 0.001, 0.002, 0.005, 0.006, 0.008, etc.

[0050] In some embodiments, the difference between the refractive index of the first sub-layer 106 and the refractive index of the second sub-layer 107 is greater than 0, and the difference between the refractive index of the first sub-layer 106 and the refractive index of the second sub-layer 107 is less than 0.2, thereby controlling the refractive index difference between each layer in the first inorganic layer 104 in the direction from the light-emitting layer 101 to the packaging layer 103, which is beneficial to improving the light output rate of the display panel 100. It can be understood that the refractive index of the present application is the refractive index of the visible light located in the visible light region.

[0051] In some embodiments, the refractive index of the first sub-layer 106 is greater than 1.8, for example, can be 1.81, 1.82, 1.83, 1.84, 1.85, 1.88, 1.89, 1.9, 1.92, 1.95, 1.98, 2, 2.1, 2.2, 2.3, etc.

[0052] In some embodiments, the refractive index of the second sub-layer 107 is greater than 1.7, and the refractive index of the second sub-layer 107 is less than 1.95, for example, can be 1.71, 1.72, 1.73, 1.75, 1.76, 1.78, 1.8, 1.81, 1.82, 1.85, 1.88, 1.9, 1.92, 1.93, etc.

[0053] Please refer to Figure 1 and Figure 2 In some embodiments, the thickness of the first sub-layer 106 is less than the thickness of the second sub-layer 107.

[0054] In some embodiments, the ratio of the thickness of the second sub-layer 107 to the thickness of the first sub-layer 106 is greater than or equal to 3:1, for example, the ratio of the thickness of the second sub-layer 107 to the thickness of the first sub-layer 106 can be 4:1, 5:1, 6:1, 8:1, etc., which is conducive to improving the light extraction efficiency of the display panel 100 while improving the display problem caused by the surrounding white and the surrounding pink. Further, the ratio of the thickness of the second sub-layer 107 to the thickness of the first sub-layer 106 is less than or equal to 10:1, which facilitates the adjustment of the thickness of the second sub-layer 107 and the thickness of the first sub-layer 106 within a suitable range.

[0055] In some embodiments, when the thickness of the first sub-layer 106 is less than the thickness of the second sub-layer 107, the thickness of the first sub-layer 106 is less than or equal to 200 nanometers, for example, it can be 20 nanometers, 50 nanometers, 80 nanometers, 100 nanometers, 120 nanometers, 140 nanometers, 150 nanometers, 180 nanometers, 190 nanometers, etc.; when the thickness of the first sub-layer is less than the thickness of the second sub-layer, the thickness of the second sub-layer 107 is greater than or equal to 600 nanometers, for example, it can be 620 nanometers, 650 nanometers, 680 nanometers, 700 nanometers, 720 nanometers, 750 nanometers, 780 nanometers, 800 nanometers, 850 nanometers, 900 nanometers, 950 nanometers, 1000 nanometers, etc. The first sub-layer 106 with smaller thickness can be filled into the surface material gap of the film layer in contact with the first sub-layer 106 on the side of the first sub-layer 106 close to the light-emitting layer 101, and the second sub-layer 107 with thicker thickness is located on the side of the first sub-layer 106 away from the light-emitting layer 101, which is beneficial to improve the oxygen and water blocking effect of the first inorganic layer 104 and improve the packaging performance of the packaging layer 103; at the same time, the extinction coefficient of the second sub-layer 107 in the visible light region is less than the extinction coefficient of the first sub-layer 106 in the visible light region, which is beneficial to improve the packaging performance of the packaging layer 103 and improve the light extraction efficiency of the display panel 100.

[0056] Please refer to Figure 3 In some embodiments, the thickness of the first sub-layer 106 is greater than the thickness of the second sub-layer 107.

[0057] In some embodiments, the ratio of the thickness of the first sub-layer 106 to the thickness of the second sub-layer 107 is greater than 12:1, for example, the ratio of the thickness of the first sub-layer 106 to the thickness of the second sub-layer 107 can be 13:1, 14:1, 15:1, 16:1, 17:1, 17.5:1, 18:1, 19:1, 20:1, 21:1, 22:1, etc., further, the ratio of the thickness of the first sub-layer 106 to the thickness of the second sub-layer 107 is less than or equal to 22:1, which is beneficial to improve the light extraction efficiency of the display panel 100 while improving the display problems caused by the surrounding environment.

[0058] In some embodiments, when the thickness of the first sub-layer 106 is greater than the thickness of the second sub-layer 107, the thickness of the first sub-layer 106 is greater than or equal to 600 nanometers, for example, it can be 700 nanometers, 750 nanometers, 800 nanometers, 850 nanometers, 900 nanometers, 950 nanometers, 1000 nanometers, 1050 nanometers, 1100 nanometers, etc.; when the thickness of the first sub-layer 106 is greater than the thickness of the second sub-layer 107, the thickness of the second sub-layer 107 is greater than or equal to 50 nanometers, and the thickness of the second sub-layer 107 is less than or equal to 200 nanometers, for example, it can be 55 nanometers, 60 nanometers, 70 nanometers, 80 nanometers, 90 nanometers, 1 nanometer, 120 nanometers, 150 nanometers, 180 nanometers, 190 nanometers, etc. The thicker first sub-layer 106 can be partially filled in the surface material gap of the film layer in contact with the first sub-layer 106 on the side of the first sub-layer 106 close to the light-emitting layer 101, which is beneficial to improve the water and oxygen blocking effect of the first inorganic layer 104 and improve the packaging performance of the packaging layer 103.

[0059] Please refer to Figures 1 to 4 In some embodiments, the first sub-layer 106 is the layer closest to the light-emitting layer 101 in the first inorganic layer 104. The oxygen content of the first sub-layer 106 is less than or equal to the oxygen content of the second sub-layer 107, which is beneficial to improve the water and oxygen blocking ability of the packaging layer 103 and improve the packaging performance of the packaging layer 103.

[0060] In some embodiments, the oxygen content of the first sub-layer 106 is less than 1%, for example, it can be 0.01%, 0.05%, 0.08%, 0.1%, 0.2%, 0.5%, 0.75%, 0.8%, 0.9%, etc., which is beneficial to block water and oxygen from invading the pixel unit 102 and improve the packaging performance of the packaging layer 103.

[0061] In some embodiments, the material of the first sub-layer 106 can be selected from a nitrogen-silicon compound (such as SiN), and the material of the second sub-layer 107 is selected from a nitrogen-silicon compound (such as SiN) or a nitrogen-oxygen-silicon compound (such as SiNO). When the material of the second sub-layer 107 is selected from a nitrogen-oxygen-silicon compound, the oxygen content of the first sub-layer 106 is less than the oxygen content of the second sub-layer 107; when the material of the second sub-layer 107 is selected from a nitrogen-silicon compound, the oxygen content of the first sub-layer 106 can be the same as the oxygen content of the second sub-layer 107, and the oxygen content of the second sub-layer 107 can be less than 1%, which is beneficial to further increase the difficulty of water and oxygen invasion and improve the packaging performance of the packaging layer 103.

[0062] In some embodiments, the refractive index of the film layer in the first inorganic layer 104 gradually decreases in the direction from the light-emitting layer 101 to the encapsulation layer 103. For example, referring to Figure 1 and Figure 2 , the first inorganic layer 104 further comprises a third sub-layer 108, the third sub-layer 108 is located between the second sub-layer 107 and the first organic layer 105, the refractive index of the third sub-layer 108 is less than the refractive index of the second sub-layer 107, the refractive index of the third sub-layer 108 is greater than or equal to the refractive index of the first organic layer 105, and the thickness of the third sub-layer 108 is less than the thickness of the second sub-layer 107. The third sub-layer 108 is arranged to gradually reduce the difference between the refractive index of the first inorganic layer 104 and the refractive index of the first organic layer 105 in the direction from the light-emitting layer 101 to the encapsulation layer 103, which is conducive to improving the light extraction efficiency of the display panel 100.

[0063] In some embodiments, the refractive index of the third sub-layer 108 is greater than 1.6, and the refractive index of the third sub-layer 108 is less than 1.76, for example, it can be 1.61, 1.62, 1.63, 1.64, 1.65, 1.68, 1.69, 1.7, 1.72, 1.73, 1.75, etc.

[0064] In some embodiments, the refractive index of the first organic layer 105 is greater than 1.48, and the refractive index of the first organic layer 105 is less than 1.55, for example, it can be 1.5, 1.51, 1.52, 1.53, 1.54, etc.

[0065] In some embodiments, the difference between the refractive index of the third sub-layer 108 and the refractive index of the first organic layer 105 is greater than 0, and the difference between the refractive index of the third sub-layer 108 and the refractive index of the first organic layer 105 is less than or equal to 0.2, for example, it can be 0.05, 0.06, 0.08, 0.1, 0.11, 0.13, 0.15, 0.16, 0.17, 0.18, 0.19, etc.

[0066] In some embodiments, the thickness of the first organic layer 105 is greater than or equal to 8 microns, and the thickness of the first organic layer 105 is less than or equal to 13 microns, for example, it can be 8.5 microns, 9 microns, 10 microns, 11 microns, 12 microns, etc.

[0067] In some embodiments, the absolute value of the difference in refractive index between any two layers within the first inorganic layer 104 is greater than 0, and the absolute value of the difference in refractive index between any two layers is less than or equal to 0.25. For example, among the first sub-layer 106, the second sub-layer 107, and the third sub-layer 108, the absolute value of the difference in refractive index between any two layers is greater than 0, and the absolute value of the difference in refractive index between any two layers is less than or equal to 0.25. That is, the difference between the refractive index of the first sub-layer 106 and the refractive index of the third sub-layer 108 is greater than 0, and the difference between the refractive index of the first sub-layer 106 and the refractive index of the third sub-layer 108 is less than or equal to 0.25; the difference between the refractive index of the second sub-layer 107 and the refractive index of the third sub-layer 108 is greater than 0, and the difference between the refractive index of the second sub-layer 107 and the refractive index of the third sub-layer 108 is less than or equal to 0.25, thereby controlling the difference in refractive index between layers within the first inorganic layer 104 in the direction from the light-emitting layer 101 to the encapsulation layer 103, which is conducive to improving the light extraction efficiency of the display panel 100 and improving the color difference caused by the thickness fluctuation of each film layer in the first inorganic layer 104 at the center and the edge region of the display panel 100.

[0068] In some embodiments, the difference in refractive index between the first sub-layer 106 and the second sub-layer 107 is greater than 0, and the difference in refractive index between the first sub-layer 106 and the second sub-layer 107 is less than 0.2, for example, it can be 0.05, 0.06, 0.07, 0.08, 0.1, 0.12, 0.13, 0.15, 0.16, 0.17, 0.18, etc., which is conducive to reducing the color difference caused by the thickness fluctuation of each film layer in the first inorganic layer 104 at the center and the edge of the display panel 100.

[0069] In some embodiments, the difference in refractive index between the second sub-layer 107 and the third sub-layer 108 is greater than 0, and the difference in refractive index between the second sub-layer 107 and the third sub-layer 108 is less than 0.2, for example, it can be 0.05, 0.06, 0.07, 0.08, 0.1, 0.12, 0.13, 0.15, 0.16, 0.18, etc., which is conducive to reducing the color difference caused by the thickness fluctuation of each film layer in the first inorganic layer 104 at the center and the edge of the display panel 100.

[0070] Referring to Table 1, the reliability of the display panel under high temperature and high humidity conditions was tested by combining the first sub-layer and the second sub-layer with different refractive index values, and matching the third sub-layer 108 with a refractive index of 1.63, to obtain the encapsulation performance difference of different combinations of the refractive index of the first sub-layer and the second sub-layer. The results are shown in Table 1. Among them, the test conditions are to place the display panel in an environment of 85°C and 85% humidity (85RH) for several hours (120 hours, 240 hours and 360 hours respectively), and evaluate whether there are dark spots and other product problems. In Table 1, “Pass” means that the display panel passes the test of the corresponding time, and “NG” means that the display panel does not pass the test of the corresponding time.

[0071] Table 1 encapsulation performance test of display panel

[0072]

[0073] As can be seen from Table 1, when the refractive index of the first sub-layer is less than that of the second sub-layer, the encapsulation performance of the display panel is poor; when the refractive index of the first sub-layer is greater than that of the second sub-layer, the encapsulation performance of the display panel improves as the difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer decreases, when the difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer is less than or equal to 0.12, the display panel can pass the encapsulation performance test for a longer time, and when the difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer is less than or equal to 0.07, the encapsulation performance of the display panel is significantly improved.

[0074] Referring to Table 2, the color difference Au’ caused by the difference of 10% in the thickness of the first inorganic layer of the display panel (i.e., the thickness of the first inorganic layer has a large fluctuation) was simulated and tested under the condition that the display panel displays white light and the refractive index of the first organic layer is 1.5. The refractive index combination of each film layer of the first inorganic layer and the color difference Au’ of the corresponding display panel obtained are shown in Table 2.

[0075] Table 2 color difference results of the center area and the edge area of the display panel

[0076]

[0077] As can be seen from Table 2, when the refractive index of the third sub-layer is 1.52, the refractive index difference between the third sub-layer and the second sub-layer is large, and △u' is large, indicating that when the thickness of the first inorganic layer fluctuates greatly, the display panel produces a large color difference, and the color uniformity is poor. In addition, when the refractive index of the third sub-layer is 1.76, the refractive index difference between the third sub-layer and the first organic layer is large, and △u' is also large, indicating that when the thickness of the first inorganic layer fluctuates greatly, the display panel produces a large color difference, and the color uniformity is poor. When the refractive index of the third sub-layer is 1.7 or 1.63, the difference between the refractive index of the second sub-layer and the refractive index of the third sub-layer, and the difference between the refractive index of the third sub-layer and the refractive index of the first organic layer are all within 0.2, and △u' is significantly reduced, indicating that when the thickness of the first inorganic layer fluctuates greatly, the color difference of the display panel is still small, and the color uniformity is good.

[0078] In some embodiments, the extinction coefficient of the third sub-layer 108 in the visible light region is less than the extinction coefficient of the first sub-layer 106 in the visible light region, which is conducive to reducing the loss of light emitted by the pixel unit 102 in the first inorganic layer 104 and improving the light extraction efficiency of the display panel 100. Further, the extinction coefficient of the third sub-layer 108 in the visible light region is less than or equal to the extinction coefficient of the second sub-layer 107 in the visible light region.

[0079] In some embodiments, the extinction coefficient of the third sub-layer 108 in the visible light region is less than 0.01, and the extinction coefficient of the third sub-layer 108 in the visible light region is greater than or equal to 0, for example, it can be 0, 0.0001, 0.0002, 0.0005, 0.0008, 0.001, 0.002, 0.005, 0.006, 0.008, etc. Preferably, the extinction coefficient of the third sub-layer 108 in the visible light region can be 0, which is conducive to maximizing the reduction of the loss of light emitted by the pixel unit 102 due to the setting of the third sub-layer 108, and improving the light extraction efficiency of the display panel 100.

[0080] Please refer to Figures 1 to 4 In some embodiments, the third sub-layer 108 is the one closest to the first organic layer 105 in the first inorganic layer 104, and the third sub-layer 108 is in direct contact with the first organic layer 105. The oxygen content of the second sub-layer 107 is less than or equal to the oxygen content of the third sub-layer 108. The first organic layer 105 is usually formed by inkjet printing technology, and the high oxygen content in the third sub-layer 108 is conducive to improving the adhesion between the first organic layer 105 and the third sub-layer 108, reducing the possibility of peeling between the first inorganic layer 104 and the first organic layer 105, and improving the product quality of the display panel 100.

[0081] In some embodiments, the third sub-layer 108 has an oxygen element content greater than or equal to 30% and less than or equal to 50%, for example, 35%, 40%, 45%, etc., which is conducive to the adhesion between the third sub-layer 108 and the first organic layer 105.

[0082] In some embodiments, due to the large oxygen element content in the third sub-layer 108, reducing the thickness of the third sub-layer 108 can reduce the total thickness of the film layer with a large oxygen element content in the first inorganic layer 104. Preferably, the thickness of the third sub-layer 108 is greater than or equal to 50 nm and less than or equal to 200 nm, for example, 60 nm, 80 nm, 90 nm, 100 nm, 110 nm, 120 nm, 150 nm, 180 nm, 190 nm, etc.

[0083] In some embodiments, the material of the third sub-layer 108 can be selected from a silicon-nitrogen-oxygen compound (e.g., SiNO). When the material of the second sub-layer 107 is selected from a silicon-nitrogen compound, the oxygen element content of the third sub-layer 108 is greater than that of the second sub-layer 107. When the material of the second sub-layer 107 is selected from a silicon-nitrogen-oxygen compound, the oxygen element content of the third sub-layer 108 can be the same as that of the second sub-layer 107.

[0084] In some embodiments, the material of the first sub-layer 106 is the same as that of the second sub-layer 107, or the material of the second sub-layer 107 is the same as that of the third sub-layer 108. The refractive index of the film layer with the same material can be adjusted by adjusting the parameters in the film layer forming process.

[0085] Please refer to Figures 1 to 4 In some embodiments, the first inorganic layer 104 can be composed of the first sub-layer 106, the second sub-layer 107, and the third sub-layer 108. That is, the side of the second sub-layer 107 close to the first sub-layer 106 directly contacts the first sub-layer 106, and the side of the second sub-layer 107 close to the third sub-layer 108 directly contacts the third sub-layer 108.

[0086] In some embodiments, the first inorganic layer 104 can further include one or more layers (e.g., two layers, three layers, four layers, etc.) between the first sub-layer 106 and the second sub-layer 107; and / or, the first inorganic layer 104 can further include one or more layers (e.g., two layers, three layers, four layers, etc.) between the second sub-layer 107 and the third sub-layer 108. The refractive index of the layers in the first inorganic layer 104 gradually decreases in the direction from the light-emitting layer 101 to the encapsulating layer 103, which is beneficial to improve the light extraction efficiency of the display panel 100.

[0087] In some embodiments, when the first inorganic layer 104 further includes one or more layers between the first sub-layer 106 and the second sub-layer 107, and / or, the first inorganic layer 104 further includes one or more layers between the second sub-layer 107 and the third sub-layer 108, the absolute value of the difference in refractive index between any two layers in the first inorganic layer 104 is greater than 0, and the absolute value of the difference in refractive index between any two layers is less than or equal to 0.25, which is beneficial to control the refractive index difference between the layers in the first inorganic layer 104 in the direction from the light-emitting layer 101 to the encapsulating layer 103, improve the light extraction efficiency of the display panel 100, and improve the color difference caused by the thickness fluctuation of the layers in the first inorganic layer 104 in the center and edge regions of the display panel 100.

[0088] In some embodiments, when the first inorganic layer 104 further includes one or more layers between the first sub-layer 106 and the second sub-layer 107, the oxygen content of the one or more layers between the first sub-layer 106 and the second sub-layer 107 is greater than or equal to the oxygen content of the first sub-layer 106, and less than or equal to the oxygen content of the second sub-layer 107. Preferably, the oxygen content of the one or more layers between the first sub-layer 106 and the second sub-layer 107 is equal to the oxygen content of the first sub-layer 106.

[0089] In some embodiments, when the first inorganic layer 104 further includes one or more layers between the first sub-layer 106 and the second sub-layer 107, the material of the one or more layers between the first sub-layer 106 and the second sub-layer 107 can be independently the same as the material of the first sub-layer 106 and / or the same as the material of the second sub-layer 107, for example, can be selected from a nitrogen-silicon compound (e.g., SiN) or a nitrogen-oxygen-silicon compound (e.g., SiNO).

[0090] In some embodiments, when the first inorganic layer 104 further comprises one or more layers between the second sub-layer 107 and the third sub-layer 108, the oxygen element content of the one or more layers between the second sub-layer 107 and the third sub-layer 108 is greater than or equal to the oxygen element content of the second sub-layer 107 and less than or equal to the oxygen element content of the third sub-layer 108.

[0091] In some embodiments, when the first inorganic layer 104 further comprises one or more layers between the second sub-layer 107 and the third sub-layer 108, the material of the one or more layers between the second sub-layer 107 and the third sub-layer 108 can be independently the same as the material of the second sub-layer 107 and / or the same as the material of the third sub-layer 108, for example, can be selected from a nitrogen silicon compound (such as SiN) or a nitrogen oxygen silicon compound (such as SiNO).

[0092] Referring to Figures 1 to 4 In some embodiments, the display panel 100 further comprises a cathode layer 109 between the light-emitting layer 101 and the encapsulation layer 103.

[0093] Referring to Figure 1 , Figure 3 and Figure 4 In some embodiments, the display panel 100 further comprises a light extraction layer 110 between the cathode layer 109 and the encapsulation layer 103. The material of the light extraction layer 110 can be an organic material or an inorganic material, which is used to improve the light extraction performance of the pixel unit 102. When the display panel 100 comprises the light extraction layer 110, the first sub-layer 106 directly contacts the light extraction layer 110, and the first sub-layer 106 covers the side surface of the light extraction layer 110 away from the light-emitting layer 101, which is conducive to improving the encapsulation performance of the encapsulation layer 103.

[0094] In some embodiments, the refractive index of the light extraction layer 110 is greater than or equal to the refractive index of the first sub-layer 106. The refractive index of the light extraction layer 110 is greater than or equal to 1.8, and the refractive index of the light extraction layer 110 is less than or equal to 2.2, for example, can be 1.95, 2, 2.05, 2.1, 2.15, etc.

[0095] In some embodiments, the difference between the refractive index of the light extraction layer 110 and the refractive index of the first sub-layer 106 is greater than 0, and the difference between the refractive index of the light extraction layer 110 and the refractive index of the first sub-layer 106 is less than 0.2, for example, it can be 0.02, 0.05, 0.06, 0.08, 0.1, 0.12, 0.15, 0.16, 0.18, etc. This is conducive to reducing the difference in refractive index between each film layer in the direction from the light-emitting layer 101 to the encapsulation layer 103, and is conducive to improving the light extraction efficiency of the display panel 100.

[0096] Please refer to Figure 1 In some embodiments, when the thickness of the first sub-layer is less than the thickness of the second sub-layer, and the display panel 100 further includes the light extraction layer 110, the side of the first sub-layer 106 close to the light extraction layer 110 is in contact with the light extraction layer 110. The thickness of the first sub-layer 106 can be less than 200 nanometers, for example, it can be 1 nanometer, 120 nanometers, 130 nanometers, 150 nanometers, 160 nanometers, 180 nanometers, 190 nanometers, etc. This is conducive to filling the surface gap of the light extraction layer 110 with the material of the first sub-layer 106, increasing the difficulty of water and oxygen invasion, and improving the encapsulation performance of the encapsulation layer 103.

[0097] In some embodiments, when the thickness of the first sub-layer is less than the thickness of the second sub-layer, and the display panel 100 further includes the light extraction layer 110, the thickness of the light extraction layer 110 is greater than or equal to 60 nanometers, and the thickness of the light extraction layer 110 can be less than or equal to 100 nanometers, for example, it can be 65 nanometers, 70 nanometers, 75 nanometers, 80 nanometers, 85 nanometers, 90 nanometers, 95 nanometers, etc.

[0098] In some embodiments, when the thickness of the first sub-layer is less than the thickness of the second sub-layer, and the display panel 100 further comprises the light extraction layer 110, the refractive index of the first sub-layer 106 is close to the refractive index of the light extraction layer 110, the thickness of the light extraction layer 110 can be appropriately thinned, and the thickness of the light extraction layer 110 that is thinned can be supplemented by the thickness of the first sub-layer 106. Specifically, the sum of the thickness of the light extraction layer 110 and the thickness of the first sub-layer 106 is greater than or equal to 60 nanometers, and the sum of the thickness of the light extraction layer 110 and the thickness of the first sub-layer 106 is less than or equal to 100 nanometers, for example, can be 65 nanometers, 70 nanometers, 75 nanometers, 80 nanometers, 85 nanometers, 90 nanometers, 95 nanometers, etc. When the sum of the thickness of the light extraction layer 110 and the thickness of the first sub-layer 106 is greater than or equal to 60 nanometers and less than or equal to 100 nanometers, the ratio of the thickness of the light extraction layer 110 to the thickness of the first sub-layer 106 can be adjusted according to the light extraction performance of the pixel unit 102. The ratio of the thickness of the light extraction layer 110 to the thickness of the first sub-layer 106 can be greater than or equal to 1:10 and less than or equal to 10:1, for example, can be 1:9, 1:8, 1:7, 1:6, 1:5, 1:4, 1:3, 1:2, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, etc.

[0099] Please refer to Figure 2 In some embodiments, when the thickness of the first sub-layer is less than the thickness of the second sub-layer, and the display panel 100 further comprises the light extraction layer 110, the refractive index of the first sub-layer 106 is close to the refractive index of the light extraction layer 110, the first sub-layer 106 can be used to replace the light extraction layer. That is, the display panel 100 can not have a light extraction layer, and the side of the first sub-layer 106 close to the cathode layer 109 is in contact with the cathode layer 109, which is conducive to reducing the production cost of the display panel 100. At this time, the thickness of the first sub-layer 106 can be less than or equal to 100 nanometers, for example, can be 20 nanometers, 40 nanometers, 50 nanometers, 60 nanometers, 70 nanometers, 80 nanometers, 90 nanometers, etc. Further, after the first sub-layer 106 replaces the light extraction layer, the thickness can be comparable to the thickness of the original light extraction layer, that is, the thickness of the first sub-layer 106 can be greater than or equal to 60 nanometers.

[0100] In some embodiments, when the first sub-layer 106 replaces the light extraction layer, the side of the first sub-layer 106 close to the cathode layer 109 is in contact with the cathode layer 109, the refractive index of the first sub-layer 106 is greater than the refractive index of the cathode layer 109, which is conducive to improving the light extraction rate of the display panel 100.

[0101] In some embodiments, when the thickness of the first sublayer 106 is greater than the thickness of the second sublayer 107, or when the thickness of the first sublayer 106 is less than the thickness of the second sublayer 107, such as Figure 4 As shown, the display panel 100 further includes a cathode layer 109 located between the light-emitting layer 101 and the encapsulation layer 103, a light extraction layer 110 located between the cathode layer 109 and the encapsulation layer 103, and an adjustment layer 115 located between the light extraction layer 110 and the encapsulation layer 103. The refractive index of the adjustment layer 115 is lower than that of the light extraction layer 110, and the refractive index of the adjustment layer 115 is lower than that of the first sub-layer 106. Because the refractive index of the adjustment layer 115 is between that of the light extraction layer 110 and the first sub-layer 106, the higher refractive index of the light extraction layer 110 can act as a convex lens, enhancing the light-gathering effect, improving the light extraction efficiency of the display panel 100, and improving the display quality of the display panel 100.

[0102] In some embodiments, the refractive index of the light extraction layer 110 is greater than the refractive index of the first sub-layer 106, and the refractive index of the first sub-layer 106 is greater than the refractive index of the adjustment layer 115.

[0103] In some embodiments, the refractive index of the adjustment layer 115 is less than 1.6, for example, it can be 1.3, 1.33, 1.35, 1.37, 1.4, 1.43, 1.45, 1.47, 1.48, 1.5, 1.53, 1.55, 1.58, etc.

[0104] Please see Figure 4 In some embodiments, the adjustment layer 115 is in contact with the first sub-layer 106 on the side closest to the first sub-layer 106, and the adjustment layer 115 is in contact with the light extraction layer 110 on the side closest to the light extraction layer 110.

[0105] In some embodiments, the thickness of the adjustment layer 115 is less than 100 nanometers, for example, it can be 10 nanometers, 15 nanometers, 20 nanometers, 25 nanometers, 30 nanometers, 35 nanometers, 40 nanometers, 50 nanometers, 60 nanometers, 70 nanometers, 80 nanometers, 90 nanometers, etc., so as to adjust the light-gathering effect of the light extraction layer 110 within a suitable thickness range and improve the display quality of the display panel 100.

[0106] In some embodiments, the material of the adjustment layer 115 may be selected from materials whose refractive index is between that of the first sublayer 106 and the light extraction layer 110. For example, the material of the adjustment layer 115 may include lithium fluoride (LiF) or the like.

[0107] Please seeFigures 1 to 4 In some embodiments, the encapsulation layer 103 further comprises a second inorganic layer 111 located on the side of the first organic layer 105 away from the first inorganic layer 104. The second inorganic layer 111 has an extinction coefficient less than 0.01 in the visible light region, for example, 0.0001, 0.0002, 0.0005, 0.0008, 0.001, 0.002, 0.005, 0.006, 0.008, etc. Further, the second inorganic layer 111 has an extinction coefficient greater than or equal to 0 in the visible light region, which is conducive to reducing the loss of light emitted by the pixel unit 102 and improving the light extraction efficiency of the display panel 100.

[0108] In some embodiments, the second inorganic layer 111 has a refractive index greater than 1.8, for example, 1.81, 1.82, 1.85, 1.86, 1.87, 1.9, 1.91, 1.92, etc.

[0109] In some embodiments, the second inorganic layer 111 comprises a fourth sub-layer, and the material of the fourth sub-layer can be selected from a nitrogen-silicon compound (e.g., SiN).

[0110] In some embodiments, the thickness of the second inorganic layer 111 is greater than or equal to 500 nanometers, and the thickness of the second inorganic layer 111 is less than or equal to 900 nanometers, for example, 550 nanometers, 600 nanometers, 650 nanometers, 700 nanometers, 750 nanometers, 800 nanometers, 850 nanometers, etc.

[0111] Please refer to Figures 1 to 4 In some embodiments, the display panel 100 further comprises a substrate 112 located on the side of the light-emitting layer 101 away from the encapsulation layer 103. The substrate 112 can be a hard substrate, such as a glass substrate, or the substrate 112 can be a flexible substrate, such as a substrate formed of polyimide. When the substrate 112 is a flexible substrate, the substrate 112 can be formed of multiple sub-substrates made of the same material, such as polyimide, and adjacent sub-substrates are bonded by an adhesive sub-layer.

[0112] Please refer to Figures 1 to 4In some embodiments, the display panel 100 further comprises a thin film transistor layer 113 between the substrate 112 and the light emitting layer 101. The thin film transistor layer 113 comprises a thin film transistor comprising a semiconductor on the substrate 112, which can be formed of polycrystalline silicon or metal oxide (such as indium gallium zinc oxide). The semiconductor is divided into a channel region and a source region and a drain region formed on both sides of the channel region. The thin film transistor layer 113 further comprises a first gate insulating layer covering the semiconductor. The thin film transistor further comprises a first gate formed on the first gate insulating layer, which overlaps the channel region. The first gate can be formed of multiple layers or a single layer comprising a low-resistance material such as Al, Ti, Mo, Cu, Ni, or an alloy thereof, or a material with high corrosion resistance. The thin film transistor layer 113 further comprises a second gate insulating layer covering the first gate. The thin film transistor further comprises a second gate on the second gate insulating layer, which overlaps the first gate, which can be formed of multiple layers or a single layer comprising a low-resistance material such as Al, Ti, Mo, Cu, Ni, or an alloy thereof, or a material with high corrosion resistance. The thin film transistor layer 113 further comprises a first interlayer insulating layer formed on the second gate. The first interlayer insulating layer and the first gate insulating layer, the second gate insulating layer comprise a source contact hole and a drain contact hole, through which the source region and the drain region are exposed, respectively.

[0113] The thin film transistor further comprises a source and a drain formed on the first interlayer insulating layer in the same layer, the source is connected to the source region through the source contact hole, and the drain is connected to the drain region through the drain contact hole. The source and the drain can be multiple layers or a single layer formed of a low-resistance material such as Al, Ti, Mo, Cu, Ni, or an alloy thereof, or a material with high corrosion resistance. For example, the source and the drain can be a triple layer of Ti / Cu / Ti, Ti / Ag / Ti, Ti / Al / Ti, or Mo / Al / Mo, or other single layer or multi-layer structures.

[0114] In some embodiments, the display panel 100 further comprises a planar layer between the thin film transistor layer 113 and the light emitting layer 101, which covers the source and the drain.

[0115] Please refer to Figures 1 to 4In some embodiments, the display panel 100 further comprises an anode layer between the planar layer and the light-emitting layer 101, the anode layer comprising a plurality of anodes 114, each of which is arranged one-to-one with a pixel unit 102. Each of the anodes 114 is electrically connected to the thin film transistor respectively. The planar layer comprises an anode contact hole through which the anode 114 contacts the source or drain of the thin film transistor.

[0116] In some embodiments, the display panel 100 further comprises a pixel definition layer on the same side of the substrate 112 as the pixel units 102, the pixel definition layer comprising pixel definition portions and openings between the pixel definition portions, the pixel units 102 being located in the openings. The openings expose part of the anodes 114 and cover the edges of the anodes 114. The pixel units 102 can comprise red pixel units, green pixel units and blue pixel units.

[0117] Please refer to Figures 1 to 4 In some embodiments, the cathode layer 109 covers the light-emitting layer 101. In the direction from the anode 114 to the cathode layer 109, the light-emitting layer 101 comprises a hole-conducting organic layer, a light-emitting material layer and an electron-conducting organic layer arranged in sequence. The hole-conducting organic layer can comprise a hole injection layer and a hole transport layer, the hole injection layer being in direct contact with the anode 114, and the hole transport layer being between the hole injection layer and the light-emitting material layer. The hole-conducting organic layer can further comprise an electron blocking layer between the hole transport layer and the light-emitting material layer. The electron-conducting organic layer can comprise an electron injection layer and an electron transport layer, the electron injection layer being in direct contact with the cathode layer 109, and the electron transport layer being between the electron injection layer and the light-emitting material layer. The electron-conducting organic layer can further comprise a hole blocking layer between the electron transport layer and the light-emitting layer 101.

[0118] In some embodiments, the display panel 100 further comprises a touch layer on the side of the encapsulation layer 103 away from the light-emitting layer 101. The touch layer can be implemented in a self-capacitive touch or a mutual-capacitive touch. When the touch layer is implemented in a self-capacitive touch, the touch layer can have only one touch metal layer.

[0119] When the manner in which the touch layer implements the touch function is mutual capacitance touch, the touch layer comprises a first touch metal layer, a touch insulating layer and a second touch metal layer, wherein the touch insulating layer is located on a side of the first touch metal layer away from the encapsulation layer 103, and the second touch metal layer is located on a side of the touch insulating layer away from the encapsulation layer 103. The first touch metal layer can be directly arranged on the encapsulation layer 103, or a spacing layer is further arranged between the first touch layer and the encapsulation layer 103, and the spacing layer can comprise an inorganic spacing layer and / or an organic spacing layer. The first touch metal layer comprises a first touch electrode, a second touch electrode and a first bridge line, the second touch metal layer comprises a second bridge line, and the first touch electrode and the second touch electrode are both metal networks; or the second touch metal layer comprises a first touch electrode, a second touch electrode and a first bridge line, and the first touch metal layer comprises a second bridge line.

[0120] In some embodiments, the display panel 100 further comprises a polarizing layer, and the polarizing layer is located on a side of the touch layer away from the encapsulation layer 103.

[0121] In some embodiments, the display panel 100 further comprises a cover plate layer, and the cover plate layer and the polarizing layer can be bonded by an optical adhesive layer.

[0122] The display panel 100 provided by the embodiment of the present application improves the display effect of the display panel 100 while improving the light extraction efficiency of the display panel 100 by arranging the first sub-layer 106 and the second sub-layer 107 in the first inorganic layer 104 in the encapsulation layer 103, and the refractive index of the first sub-layer 106 and the second sub-layer 107 decreases in turn and the thickness of the second sub-layer 107 is greater than the thickness of the first sub-layer 106.

[0123] Please refer to Figure 5 The embodiment of the present application further provides a display device 10 comprising the display panel 100 as any of the above.

[0124] The specific structure of the display panel 100 can refer to the embodiment of any of the above display panels and the drawings, and will not be described here.

[0125] In some embodiments, the display device 10 further comprises a device body 200, and the device body 200 and the display panel 100 are combined into one.

[0126] In some embodiments, the device body 200 can comprise a middle frame, a frame adhesive and the like, and the display device 10 can be a mobile phone, a tablet computer, a television and the like, without being limited here.

[0127] The display panel and the display device are disclosed, the display panel comprises a light-emitting layer and an encapsulation layer, the light-emitting layer comprises a plurality of pixel units, the encapsulation layer is located on the light-emitting side of the light-emitting layer, the encapsulation layer comprises a first inorganic layer and a first organic layer, the first organic layer is located on the side of the first inorganic layer away from the light-emitting layer, the first inorganic layer comprises a first sub-layer and a second sub-layer, the second sub-layer is located between the first sub-layer and the first organic layer, the refractive index of the first sub-layer is greater than the refractive index of the second sub-layer, and the thickness of the first sub-layer is less than the thickness of the second sub-layer, by arranging the first sub-layer and the second sub-layer in the first inorganic layer of the encapsulation layer of the display panel, the refractive index of the first sub-layer and the second sub-layer decreases in turn, and the thickness of the first sub-layer is less than the thickness of the second sub-layer, so that the light-emitting efficiency of the display panel is improved, and the display effect of the display panel is improved.

[0128] The display panel and the display device are disclosed, the display panel comprises a light-emitting layer and an encapsulation layer, the light-emitting layer comprises a plurality of pixel units, the encapsulation layer is located on the light-emitting side of the light-emitting layer, the encapsulation layer comprises a first inorganic layer and a first organic layer, the first organic layer is located on the side of the first inorganic layer away from the light-emitting layer, the first inorganic layer comprises a first sub-layer and a second sub-layer, the second sub-layer is located between the first sub-layer and the first organic layer, the refractive index of the first sub-layer is greater than the refractive index of the second sub-layer, and the thickness of the first sub-layer is less than the thickness of the second sub-layer, by arranging the first sub-layer and the second sub-layer in the first inorganic layer of the encapsulation layer of the display panel, the refractive index of the first sub-layer and the second sub-layer decreases in turn, and the thickness of the first sub-layer is less than the thickness of the second sub-layer, so that the light-emitting efficiency of the display panel is improved, and the display effect of the display panel is improved.

Claims

1. A display panel, characterized by, The display panel comprises: a light-emitting layer; an encapsulation layer located on the light-emitting side of the light-emitting layer, the encapsulation layer comprising a first inorganic layer and a first organic layer, the first organic layer being located on the side of the first inorganic layer away from the light-emitting layer; a cathode layer located between the light-emitting layer and the encapsulation layer; wherein the first inorganic layer comprises a first sub-layer and a second sub-layer, the second sub-layer being located between the first sub-layer and the first organic layer, the refractive index of the first sub-layer being greater than the refractive index of the second sub-layer; the thickness of the first sub-layer being less than the thickness of the second sub-layer; the side of the first sub-layer close to the cathode layer being in contact with the cathode layer, the refractive index of the first sub-layer being 1.88-1.95, the refractive index of the second sub-layer being 1.71-1.80, and the difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer being 0.05-0.12; the thickness of the first sub-layer being less than or equal to 100 nanometers, and the thickness of the second sub-layer being 600-1000 nanometers; the oxygen content of the first sub-layer being less than 1%, the oxygen content of the second sub-layer being less than 1%, the material of the first sub-layer being selected from a nitrogen-silicon compound (SiN), and the material of the second sub-layer being selected from a nitrogen-oxygen-silicon compound (SiNO).

2. The display panel of claim 1, wherein, The extinction coefficient of the second sub-layer in the visible light region is less than or equal to the extinction coefficient of the first sub-layer in the visible light region.

3. The display panel of claim 1, wherein, The ratio of the thickness of the second sub-layer to the thickness of the first sub-layer is greater than or equal to 3:

1.

4. The display panel of claim 1, wherein, The display panel further comprises a light extraction layer located between the cathode layer and the encapsulation layer, and the side of the first sub-layer close to the light extraction layer is in contact with the light extraction layer.

5. The display panel of claim 4, wherein, The sum of the thickness of the light extraction layer and the thickness of the first sub-layer is greater than or equal to 60 nanometers, and the sum of the thickness of the light extraction layer and the thickness of the first sub-layer is less than or equal to 100 nanometers.

6. The display panel of claim 1, wherein, The display panel further comprises a cathode layer located between the light-emitting layer and the encapsulation layer, a light extraction layer located between the cathode layer and the encapsulation layer, and an adjustment layer located between the light extraction layer and the encapsulation layer; wherein the refractive index of the adjustment layer is less than the refractive index of the light extraction layer, and the refractive index of the adjustment layer is less than the refractive index of the first sub-layer.

7. The display panel of claim 6, wherein, The refractive index of the adjustment layer is less than 1.

6.

8. The display panel of any of claims 1-7, wherein, The first inorganic layer further comprises a third sub-layer, the third sub-layer being located between the second sub-layer and the first organic layer, the refractive index of the third sub-layer being less than the refractive index of the second sub-layer, the refractive index of the third sub-layer being greater than or equal to the refractive index of the first organic layer, and the thickness of the third sub-layer being less than the thickness of the second sub-layer.

9. The display panel of claim 8, wherein, The extinction coefficient of the third sub-layer in the visible light region is less than the extinction coefficient of the first sub-layer in the visible light region.

10. The display panel of claim 8, wherein, The difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer is greater than 0, and the difference between the refractive index of the first sub-layer and the refractive index of the second sub-layer is less than 0.2; The difference between the refractive index of the second sub-layer and the refractive index of the third sub-layer is greater than 0, and the difference between the refractive index of the second sub-layer and the refractive index of the third sub-layer is less than 0.

2.

11. The display panel of claim 10, wherein The third sub-layer has a refractive index greater than 1.6 and less than 1.

76.

12. The display panel of claim 8, wherein, The second sub-layer has an oxygen content less than or equal to the oxygen content of the third sub-layer.

13. The display panel of claim 12, wherein, The third sub-layer is made of a silicon oxynitride.

14. The display panel of claim 1, wherein, The encapsulation layer further comprises a second inorganic layer on a side of the first organic layer away from the first inorganic layer. The second inorganic layer has an extinction coefficient less than 0.01 in the visible light region.

15. A display device comprising: A display panel comprising the display panel of any one of claims 1 to 14.

Images