Display panel and display equipment

Abstract

The invention provides a display panel and display equipment. The display panel comprises a substrate, a light-emitting device, a first inorganic packaging layer and an organic packaging layer, the light-emitting device is arranged on the substrate, the first inorganic packaging layer is arranged on the side, away from the substrate, of the light-emitting device, the organic packaging layer is arranged on the side, away from the substrate, of the first inorganic packaging layer, the first inorganic packaging layer comprises a first inorganic packaging sub-layer, and the second inorganic packaging sub-layer comprises a second inorganic packaging sub-layer. The first inorganic packaging sub-layer is arranged between the organic packaging layer and the light-emitting device, the first inorganic packaging sub-layer is in contact with the organic packaging layer, and the numerical value of the product of the refractive index of the first inorganic packaging sub-layer and the thickness of the film layer meets 1 / 8 * lambda < lt >; n * hlt; the lambda is the wavelength corresponding to the maximum peak value of the spectrum of the light emitted by the light-emitting device, the n is the refractive index of the first inorganic packaging sub-layer, and the h is the film thickness of the first inorganic packaging sub-layer. The light emitting efficiency of the display panel can be effectively improved by reasonably setting the film layer thickness and the refractive index of the packaging layer.

Description

Technical Field

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

[0002] The display panel generally includes an encapsulation layer disposed on the light emitting device. Since the encapsulation layer is in direct contact with the light emitting device, the encapsulation layer will reflect the light emitted by the light emitting device, resulting in a reduction in the light extraction efficiency of the display panel. Summary of the invention

[0003] In view of this, the present application provides a display panel and a display device, which are used to improve the problem that the display panel is affected by the packaging layer, resulting in reduced light extraction efficiency.

[0004] The technical solution adopted by this application to solve the above technical problems is:

[0005] In a first aspect, an embodiment of the present application provides a display panel, including:

[0006] substrate;

[0007] A light emitting device is disposed on the substrate;

[0008] A first inorganic encapsulation layer is provided on a side of the light emitting device away from the substrate;

[0009] an organic encapsulation layer, disposed on a side of the first inorganic encapsulation layer away from the substrate;

[0010] The first inorganic encapsulation layer includes a first inorganic encapsulation sublayer, the first inorganic encapsulation sublayer is disposed between the organic encapsulation layer and the light-emitting device, and the first inorganic encapsulation sublayer is in contact with the organic encapsulation layer, and the value of the product of the refractive index and the film thickness of the first inorganic encapsulation sublayer satisfies: 1 / 8×λ <n×h<3 / 8×λ;

[0011] The λ is the wavelength corresponding to the maximum peak of the spectrum of the light emitted by the light emitting device, the n is the refractive index of the first inorganic encapsulation sublayer, and the h is the film thickness of the first inorganic encapsulation sublayer.

[0012] In some embodiments of the present application, the refractive index of the first inorganic encapsulation sublayer is greater than the refractive index of the organic encapsulation layer.

[0013] In some embodiments of the present application, the first inorganic encapsulation layer further includes a second inorganic encapsulation sublayer, and the second inorganic encapsulation sublayer is disposed between the first inorganic encapsulation sublayer and the light-emitting device.

[0014] In some embodiments of the present application, the refractive index of the second inorganic encapsulation sublayer is greater than the refractive index of the first inorganic encapsulation sublayer.

[0015] In some embodiments of the present application, the first inorganic encapsulation layer further includes a third inorganic encapsulation sub-layer, and the third inorganic encapsulation sub-layer is disposed between the second inorganic encapsulation sub-layer and the light-emitting device.

[0016] In some embodiments of the present application, the refractive index of the third inorganic encapsulation sub-layer is less than the refractive index of the second inorganic encapsulation sub-layer.

[0017] In some embodiments of the present application, the second inorganic encapsulation sub-layer and the first inorganic encapsulation sub-layer form an encapsulation sub-layer unit, and a plurality of the encapsulation sub-layer units are stacked between the third inorganic encapsulation sub-layer and the organic encapsulation layer.

[0018] In some embodiments of the present application, the product range of the refractive index and the film thickness of the first inorganic encapsulation sub-layer is from 79.125 to 172.5.

[0019] In some embodiments of the present application, the refractive index of the first inorganic encapsulation sub-layer is 1.64, and the thickness of the first inorganic encapsulation sub-layer is 70 nm or 90 nm.

[0020] In a second aspect, an embodiment of the present application provides a display device, including the display panel as described in the first aspect.

[0021] In summary, due to the adoption of the above technical solutions, the present application has at least the following beneficial effects:

[0022] The embodiments of the present application provide a display panel and a display device. By controlling the numerical range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer directly contacting the organic encapsulation layer within 1 / 8×λ < n×h < 3 / 8×λ, the first inorganic encapsulation sub-layer can play an antireflection role, thereby improving the light extraction efficiency of the light emitted by the light-emitting device. Specifically, first, by disposing an inorganic encapsulation layer and an organic encapsulation layer on the light-emitting side of the light-emitting device, the encapsulation effect is improved to prevent the intrusion of water and oxygen. Then, by disposing the first inorganic encapsulation sub-layer in the first inorganic encapsulation layer between the organic encapsulation layer and the light-emitting device and making the first inorganic encapsulation sub-layer contact the organic encapsulation layer; and by defining the refractive index and the film thickness of the first inorganic encapsulation sub-layer to satisfy the formula 1 / 8×λ < n×h < 3 / 8×λ, the first inorganic encapsulation sub-layer and the organic encapsulation layer cooperate, so that the first inorganic encapsulation sub-layer can not only act as an encapsulation layer to block water and oxygen, but also increase the light transmittance, thereby achieving the purpose of improving the light extraction efficiency of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a display panel provided by an embodiment of the present application;

[0024] Figure 2 A schematic diagram of experimental test results of a display panel provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 100, substrate; 200, light-emitting device; 210, anode; 220, light-emitting layer; 230, cathode; 240, charge protection layer; 300, first inorganic encapsulation layer; 310, first inorganic encapsulation sublayer; 320, second inorganic encapsulation sublayer; 330, third inorganic encapsulation sublayer; 400, organic encapsulation layer; 500, second inorganic encapsulation layer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0028] In the description of this application, it should be understood that the words "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0030] See also Figure 1 An embodiment of the present application provides a display panel, including a substrate 100 , a light emitting device 200 , a first inorganic encapsulation layer and an organic encapsulation layer 400 .

[0031] The light emitting device 200 is disposed on the substrate 100 , the first inorganic encapsulation layer 300 is disposed on a side of the light emitting device 200 away from the substrate 100 , and the organic encapsulation layer 400 is disposed on a side of the first inorganic encapsulation layer 300 away from the substrate 100 .

[0032] Further, the first inorganic encapsulation layer 300 includes a first inorganic encapsulation sub-layer 310. The first inorganic encapsulation sub-layer 310 is disposed between the organic encapsulation layer 400 and the light-emitting device 200, and the first inorganic encapsulation sub-layer 310 is in contact with the organic encapsulation layer 400. The value of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 satisfies: 1 / 8×λ < n×h < 3 / 8×λ;

[0033] where λ is the wavelength corresponding to the maximum peak of the spectrum of the light emitted by the light-emitting device 200, n is the refractive index of the first inorganic encapsulation sub-layer 310, and h is the film thickness of the first inorganic encapsulation sub-layer 310.

[0034] In the technical solution provided by the present application, by controlling the value range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 that is directly in contact with the organic encapsulation layer 400 within 1 / 8×λ < n×h < 3 / 8×λ, the first inorganic encapsulation sub-layer 310 can play a role in increasing light transmission, thereby improving the light extraction efficiency of the light emitted by the light-emitting device 200. Specifically, first, by providing an inorganic encapsulation layer and an organic encapsulation layer 400 on the light-emitting side of the light-emitting device 200, the encapsulation effect is improved to prevent the intrusion of water and oxygen. Then, by disposing the first inorganic encapsulation sub-layer 310 in the first inorganic encapsulation layer 300 between the organic encapsulation layer 400 and the light-emitting device 200 and making the first inorganic encapsulation sub-layer 310 in contact with the organic encapsulation layer 400; and then by limiting the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 to satisfy the formula 1 / 8×λ < n×h < 3 / 8×λ, the first inorganic encapsulation sub-layer 310 and the organic encapsulation layer 400 cooperate, so that the first inorganic encapsulation sub-layer 310 can not only act as an encapsulation layer to block water and oxygen, but also play a role in increasing the light transmittance, thereby achieving the purpose of improving the light extraction efficiency of the display panel.

[0035] It should be noted that the range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 is applicable to the red, green, and blue light rays emitted by the light-emitting device 200, that is, no matter which of the three colors of red, green, and blue the light emitted by the light-emitting device 200 is, the first inorganic encapsulation sub-layer 310 can reduce the reflectivity of the emitted light and increase the transmittance, playing a role in increasing light transmission.

[0036] It should also be noted that for the first inorganic encapsulation sub-layer 310, in addition to including the first inorganic encapsulation sub-layer 310, it may also include other multiple inorganic encapsulation sub-layers which are stacked. As long as the first inorganic encapsulation sub-layer 310 is located between the organic encapsulation layer 400 and the light-emitting device 200 and the first inorganic encapsulation sub-layer 310 is in contact with the organic encapsulation layer 400. The film thickness and refractive index of the first inorganic encapsulation sub-layer 310 will directly determine the transmission effect of the light emitted by the light-emitting device 200. Therefore, by limiting the film thickness and refractive index of the first inorganic encapsulation sub-layer 310, the first inorganic encapsulation sub-layer 310 can be used as an "anti-reflection" film layer to reduce the reflection of the emitted light, thereby improving the light extraction efficiency of the light-emitting device 200 and reducing the overall power consumption of the display panel.

[0037] And the "first" in the first inorganic encapsulation sub-layer 310 does not limit the specific stacking structure of the inorganic encapsulation sub-layer. "First" is only used to distinguish multiple inorganic encapsulation sub-layers for convenient naming. The terms including "second" and "third" also do not specifically limit the structure of the inorganic encapsulation sub-layer, but are only used to distinguish multiple inorganic encapsulation sub-layers for convenient naming. In this embodiment, as long as the inorganic encapsulation sub-layer is located between the organic encapsulation layer 400 and the light-emitting device 200 and the inorganic encapsulation sub-layer is in contact with the organic encapsulation layer 400, it is the first inorganic encapsulation sub-layer 310, which mainly serves the purpose of anti-reflection.

[0038] The derivation process of the formula 1 / 8×λ < n×h < 3 / 8×λ is as follows:

[0039] When light is incident on an interface with different refractive indices, part of the light will be reflected and part will be transmitted. If the interface is a thin film (such as an inorganic encapsulation layer) and the thickness of the thin film is comparable to the wavelength of the light, multiple reflections will occur at the upper and lower interfaces of the film for the incident light. At this time, interference will occur between the reflected light beams, that is, the reflected lights will be superposed on each other. According to the principle of optical interference, if the phase difference of the reflected light waves is an integer multiple of half a wavelength, constructive interference will increase the reflection; if the phase difference is an odd multiple of half a wavelength, destructive interference will reduce the reflection, thereby improving the light transmittance. For a thin film with a thickness of h, the optical path difference Δ between the light waves reflected from its upper and lower surfaces can be expressed as:

[0040] Δ = 2nhcosθ;

[0041] where n is the refractive index of the thin film, h is the thickness of the thin film, and θ is the incident angle of the light in the thin film. In the design of the anti-reflection film, normally the normally incident light (i.e., θ = 0) is considered. At this time, the optical path difference is simplified to:

[0042] Δ = 2nh;

[0043] According to the phase difference formula of light waves, when the optical path difference Δ is related to the wavelength λ of the light, the phase difference between the light waves reflected from the upper and lower surfaces of the film is:

[0044]

[0045] In order to achieve the anti-reflection effect, the reflected light waves need to produce destructive interference, that is, the phase difference of the reflected light waves is required to be an odd multiple of half the wavelength, that is:

[0046]

[0047] Wherein, m is a natural number.

[0048] By Substituting the destructive interference condition, we can obtain:

[0049] 4пnh / λ=(2m+1)п;

[0050] The final condition for the film thickness is:

[0051] nh=(2m+1)λ / 4;

[0052] For the smallest case of m=0, the film thickness is:

[0053] nh = λ / 4;

[0054] It is suitable for eliminating the reflection of a specific wavelength of light. However, since light is composed of multiple wavelengths, if you want to further reduce the reflection, you can allow a slight deviation in thickness, that is:

[0055] 1 / 8×λ <n×h<3 / 8×λ;

[0056] This formula sets the thickness and refractive index of the film layer so that the reflected light waves produce destructive interference at the interface, reducing reflection and thus increasing the intensity of the transmitted light.

[0057] In some embodiments, the refractive index of the first inorganic encapsulation sublayer 310 is greater than the refractive index of the organic encapsulation layer 400. When light is incident from one medium into another medium, part of the light will be reflected and part of the light will be transmitted. The reflectivity can be calculated using the reflectivity formula. The formula for calculating the reflectivity is:

[0058] R = [(n2-n1) / (n2+n1)] 2 ;

[0059] From the reflectivity formula, it can be seen that when the refractive index of the first inorganic encapsulation sublayer 310 is greater than the refractive index of the organic encapsulation layer 400, the reflectivity calculated by the reflectivity formula is lower, which can reduce the reflection of light between different layers and increase the probability of more light transmission, thereby improving the overall light output efficiency.

[0060] Furthermore, the first inorganic encapsulation layer 300 further includes a second inorganic encapsulation sublayer 320 , and the second inorganic encapsulation sublayer 320 is disposed between the first inorganic encapsulation sublayer 310 and the light emitting device 200 to improve the encapsulation effect of the inorganic encapsulation layer.

[0061] Furthermore, the refractive index of the second inorganic encapsulation sublayer 320 is greater than the refractive index of the first inorganic encapsulation sublayer 310. The refractive index between the first inorganic encapsulation sublayer 310 and the second inorganic encapsulation sublayer 320 forms a gradient. Combined with the refractive index of the organic encapsulation layer 400, the refractive index relationship between the three is that the refractive index of the first inorganic encapsulation sublayer 310 is less than the refractive index of the second inorganic encapsulation sublayer 320 and the refractive index of the first inorganic encapsulation sublayer 310 is greater than the refractive index of the organic encapsulation layer 400, forming a three-layer refractive index gradient. Combined with the aforementioned reflectivity formula, it can be seen that when the refractive index of the second inorganic encapsulation sublayer 320 is greater than the refractive index of the first inorganic encapsulation sublayer 310, the reflectivity between the second inorganic encapsulation sublayer 320 and the first inorganic encapsulation sublayer 310 is reduced, so that the reflection of light between different layers between the second inorganic encapsulation sublayer 320 and the first inorganic encapsulation sublayer 310 can be reduced, and the overall light emission efficiency is further improved.

[0062] In some embodiments, the first inorganic encapsulation layer 300 further includes a third inorganic encapsulation sublayer 330. The third inorganic encapsulation sublayer 330 is disposed between the second inorganic encapsulation sublayer 320 and the light-emitting device 200 to further improve the encapsulation effect. Furthermore, the refractive index of the third inorganic encapsulation sublayer 330 is less than the refractive index of the second inorganic encapsulation sublayer 320, so that the three layers of inorganic encapsulation sublayers together constitute a thin film encapsulation structure. Preferably, the refractive index of the third inorganic encapsulation sublayer 330 is greater than the refractive index of the first inorganic encapsulation sublayer 310.

[0063] In some embodiments, the first inorganic encapsulation sublayer 310 , the second inorganic encapsulation sublayer 320 , and the third inorganic encapsulation sublayer 330 are all made of silicon oxynitride material.

[0064] In some embodiments, the first inorganic encapsulation sublayer 310, the second inorganic encapsulation sublayer 320 and the third inorganic encapsulation sublayer 330 are stacked in sequence from top to bottom, and the three inorganic encapsulation sublayers work together to achieve a better light extraction effect. The following formula needs to be satisfied between the first inorganic encapsulation sublayer 310, the second inorganic encapsulation sublayer 320 and the third inorganic encapsulation sublayer 330:

[0065] n1h1+n2h2+n3h3=[(6m+3)λ] / 4;

[0066] Wherein, n1 is the refractive index of the first inorganic encapsulation sublayer 310, h1 is the film thickness of the first inorganic encapsulation sublayer 310, n2 is the refractive index of the second inorganic encapsulation sublayer 320, h2 is the film thickness of the second inorganic encapsulation sublayer 320, n3 is the refractive index of the third inorganic encapsulation sublayer, and h3 is the film thickness of the third inorganic encapsulation sublayer. m is a natural number, and λ is the wavelength corresponding to the maximum peak of the spectrum of the light emitted by the light emitting device 200. This formula ensures the synergy between the three layers of inorganic encapsulation sublayers, so that the light waves undergo continuous destructive interference between layers, reducing reflection and enhancing the light transmission effect.

[0067] Furthermore, the light emitting device 200 emits light of various wavelengths, so it is necessary to ensure that the formula can adapt to the spectrum range of different wavelengths. Assume that the wavelength corresponding to the maximum peak of the spectrum corresponding to red, green, and blue light is λ R , G , B , then the refractive index and film thickness between the three inorganic encapsulation sub-layers should satisfy the range of these three wavelengths at the same time:

[0068] n1h1+n2h2+n3h3=[(6m+3)λ R ] / 4;

[0069] n1h1+n2h2+n3h3=[(6m+3)λ G ] / 4;

[0070] n1h1+n2h2+n3h3=[(6m+3)λ B ] / 4;

[0071] In summary, the refractive index and film thickness of the three inorganic encapsulation sublayers need to satisfy the following formula:

[0072] n1h1+n2h2+n3h3=[(6m+3)λ avg ] / 4;

[0073] Among them, λ avg It refers to the average wavelength corresponding to the maximum peak of the spectrum of the three colors of light emitted by the light emitting device 200.

[0074] It should be noted that the relationship between the refractive index and the film thickness of the first inorganic encapsulation sublayer 310, the second inorganic encapsulation sublayer 320 and the third inorganic encapsulation sublayer 330 is as follows:

[0075] n2>n1≥n3;

[0076] h2>h1≥h3.

[0077] Further, for the second inorganic encapsulation sub-layer 320, among the three-layer inorganic encapsulation sub-layers, it has the largest thickness. If the film thickness is too large, it may cause constructive interference of the transmitted light, thereby increasing reflection. Based on this, the film thickness of the three-layer inorganic encapsulation sub-layers can satisfy the following relationship:

[0078] h1∝(1 / n1) a ;

[0079] h2∝(1 / n2) b ;

[0080] h3∝(1 / n3) c ;

[0081] where a, b, and c are adjustment parameters used to optimize the non-linear relationship between the thickness and the refractive index. By adjusting a, b, and c, the best balance point between the refractive index and the thickness can be found in terms of the interference effect of light, avoiding the accumulation of reflection. For example, b < a < c can be set to increase the thickness of the middle layer while maintaining a low light reflection.

[0082] In some embodiments, for the second inorganic encapsulation sub-layer, the following compensation formula can also be satisfied:

[0083] n2 2 ×h2=n1×h1+n3×h3;

[0084] When the second inorganic encapsulation sub-layer 320 satisfies the compensation formula, it can ensure that when the refractive index of the second inorganic encapsulation sub-layer 320 is high, its film thickness is compensated and adjusted to avoid excessive reflection.

[0085] In some embodiments, the second inorganic encapsulation sub-layer 320 and the first inorganic encapsulation sub-layer 310 form an encapsulation sub-layer unit. A plurality of encapsulation sub-layer units are stacked between the third inorganic encapsulation sub-layer 330 and the organic encapsulation layer 400. By introducing a plurality of encapsulation sub-layer units (each encapsulation sub-layer unit is composed of the first inorganic encapsulation sub-layer 310 and the second inorganic encapsulation sub-layer 320) into the encapsulation structure of the display panel, the reflection loss of light is further reduced and the light-emitting efficiency is enhanced. Specifically, by stacking a plurality of encapsulation sub-layer units, the reflection loss of light at the multi-layer interfaces gradually decreases. By setting a plurality of encapsulation sub-layer units, it is ensured that light can be efficiently transmitted in different wavelength ranges, and the final light transmittance can be calculated by superimposing the inter-layer light transmittances.

[0086] In some embodiments, the product range of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 is from 79.125 to 172.5. This product range is applicable to the red light, blue light, and green light emitted by the light-emitting device 200. The specific calculation process of this product range is:

[0087] Substitute the λ corresponding to the light of each color into the calculation formula of the numerical range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310, and the numerical range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 corresponding to each light can be obtained. By taking the intersection of the ranges of the three lights, the numerical range of the product of the refractive index and the film thickness that can adapt to the three-color lights can be obtained.

[0088] Specifically, the λ corresponding to the red light is 633, the λ corresponding to the green light is 520, and the λ corresponding to the blue light is 460. The numerical range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 calculated by the red light is: 79.125 < nh < 237.375; the numerical range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 calculated by the green light is: 65 < nh < 195; the numerical range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 calculated by the blue light is: 57.5 < nh < 172.5. Taking the intersection of the three numerical ranges, the numerical range of the product of the refractive index and the film thickness of the first inorganic encapsulation sub-layer 310 that can adapt to the three-color lights is 79.125 < nh < 172.5.

[0089] In some embodiments, the refractive index of the third inorganic encapsulation sub-layer 330 is 1.52, the refractive index of the second inorganic encapsulation sub-layer 320 is 1.81, the refractive index of the first inorganic encapsulation sub-layer 310 is 1.64, and the refractive index of the organic encapsulation layer 400 is 1.52. The white light extraction efficiency experiment of the display panel is tested with the first inorganic encapsulation sub-layer 310 with different film thicknesses. In this test, the film thicknesses are taken as 70nm, 90nm, 110nm, and 130nm respectively. For the specific experimental results, please refer to Figure 2 . Combined with Figure 2 and the numerical range obtained above, it can be seen that when the film thickness of the first inorganic encapsulation sub-layer 310 is 70nm or 90nm, the product of the film thickness and the refractive index is 114.8 or 147.6, which satisfies the above product range and is beneficial to improving the white light extraction efficiency. When the film thickness of the first inorganic encapsulation sub-layer 310 is 110nm or 130nm, the product of the film thickness and the refractive index is 180.4 or 213.2, which does not satisfy the above product range, so the white light extraction efficiency decreases.

[0090] In an embodiment, the first inorganic encapsulation layer 300 only includes the first inorganic encapsulation sub-layer 310 and the second inorganic encapsulation sub-layer 320. The refractive index of the first inorganic encapsulation sub-layer 310 is 1.7, the film thickness is 90nm, and the numerical range of the product is 153, which is within the above numerical range and can effectively improve the light extraction efficiency of the display panel.

[0091] In another embodiment, the first inorganic encapsulation layer 300 includes a first inorganic encapsulation sublayer 310, a second inorganic encapsulation sublayer 320, and a third inorganic encapsulation sublayer 330. The refractive index of the first inorganic encapsulation sublayer 310 is 1.7, the film thickness is 80 nm, and the product value range is 136, which is within the aforementioned value range and can effectively provide the light extraction efficiency of the display panel.

[0092] In some embodiments, the display panel further includes a second inorganic encapsulation layer 500, which is disposed on the side of the organic encapsulation layer 400 away from the substrate 100, so that the display panel has two inorganic encapsulation layers and an organic encapsulation layer 400 located between the two inorganic encapsulation layers in the encapsulation structure, which is beneficial to resist various interferences from the external environment, including but not limited to the invasion of water and oxygen. For the light-emitting device 200, it includes an anode 210, a cathode 230, a light-emitting layer 220 and a charge protection layer 240, and the anode 210, the light-emitting layer 220, the cathode 230 and the charge protection layer 240 are sequentially stacked on the substrate 100, and the first inorganic encapsulation layer 300 is disposed on the side of the charge protection layer 240 away from the substrate 100. As the detailed structure of the light-emitting device 200 is irrelevant to the main invention of the present application, and the specific structure of the light-emitting device 200 belongs to the prior art, it will not be repeated here.

[0093] In summary, the present application defines the refractive index and film thickness of the first inorganic encapsulation sublayer 310 so that the encapsulation sublayer can not only play the role of encapsulation, but also serve as an anti-reflection film to increase the transmittance, thereby reducing the reflection of the light emitted by the light-emitting device 200, thereby improving the light extraction efficiency and reducing power consumption. Specifically, the first inorganic encapsulation sublayer 310 should meet the following conditions:

[0094] 1 / 8×λ <n×h<3 / 8×λ;

[0095] Wherein, λ is the wavelength corresponding to the maximum peak of the spectrum of the light emitted by the light emitting device 200, n is the refractive index of the first inorganic encapsulation sublayer 310, and h is the film thickness of the first inorganic encapsulation sublayer 310. By precisely controlling the film thickness and refractive index, the first inorganic encapsulation sublayer 310 becomes an anti-reflection film, thereby improving the luminous efficiency.

[0096] The embodiment of the present application further provides a display device (not shown in the figure), which includes the display panel described in any of the above embodiments. By using the display panel provided in the above embodiments, it is beneficial to improve the light extraction efficiency of the display device and reduce power consumption.

[0097] It should be noted that in order to simplify the description of the embodiments of the present application and thus help understand one or more embodiments, in the above description of the embodiments of the present application, multiple features are sometimes merged into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of the present application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

Claims

1. A display panel, characterized in that: include: substrate; A light emitting device is disposed on the substrate; A first inorganic encapsulation layer is provided on a side of the light emitting device away from the substrate; an organic encapsulation layer, disposed on a side of the first inorganic encapsulation layer away from the substrate; The first inorganic encapsulation layer includes a first inorganic encapsulation sublayer, the first inorganic encapsulation sublayer is disposed between the organic encapsulation layer and the light-emitting device, and the first inorganic encapsulation sublayer is in contact with the organic encapsulation layer, and the value of the product of the refractive index and the film thickness of the first inorganic encapsulation sublayer satisfies: 1 / 8×λ <n×h<3 / 8×λ; The λ is the wavelength corresponding to the maximum peak of the spectrum of the light emitted by the light emitting device, the n is the refractive index of the first inorganic encapsulation sublayer, and the h is the film thickness of the first inorganic encapsulation sublayer.

2. The display panel according to claim 1, wherein: The refractive index of the first inorganic encapsulation sublayer is greater than the refractive index of the organic encapsulation layer.

3. The display panel according to claim 2, wherein: The first inorganic encapsulation layer further includes a second inorganic encapsulation sublayer, and the second inorganic encapsulation sublayer is disposed between the first inorganic encapsulation sublayer and the light emitting device.

4. The display panel according to claim 3, wherein: The refractive index of the second inorganic encapsulating sublayer is greater than the refractive index of the first inorganic encapsulating sublayer.

5. The display panel according to claim 4, wherein: The first inorganic encapsulation layer further includes a third inorganic encapsulation sublayer, and the third inorganic encapsulation sublayer is disposed between the second inorganic encapsulation sublayer and the light emitting device.

6. The display panel according to claim 5, wherein: The refractive index of the third inorganic encapsulation sublayer is less than the refractive index of the second inorganic encapsulation sublayer.

7. The display panel according to any one of claims 3 to 6, characterized in that: The second inorganic encapsulation sublayer and the first inorganic encapsulation sublayer constitute an encapsulation sublayer unit, and a plurality of the encapsulation sublayer units are stacked between the third inorganic encapsulation sublayer and the organic encapsulation layer.

8. The display panel according to any one of claims 1 to 6, characterized in that: The product of the refractive index of the first inorganic encapsulation sublayer and the film thickness ranges from 79.125 to 172.

5.

9. The display panel according to claim 8, wherein: The refractive index of the first inorganic encapsulation sublayer is 1.64, and the thickness of the first inorganic encapsulation sublayer is 70 nm or 90 nm.

10. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 9.

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