Display panel, display device and preparation method of display panel

Abstract

The invention discloses a display panel, a display device and a preparation method of the display panel. The display panel includes a substrate, an isolation structure, a light emitting layer, and at least one light extraction structure. The isolation structure is arranged on the substrate and forms a plurality of isolation openings in a surrounding mode so that the light-emitting layer can be separated to form light-emitting units which are disconnected with one another. The light extraction unit comprises a high refractive index layer and a low refractive index layer, the refractive index of the high refractive index layer is larger than that of the low refractive index layer, the high refractive index layer and the low refractive index layer form a distributed Bragg reflector, the high light extraction effect is achieved, and the light extraction efficiency of the display panel is improved. According to the display panel, the multiple sets of stacked light extraction units are arranged in at least part of the isolation openings, the number of the light extraction units corresponding to the light emitting units with different colors can be adaptively adjusted, the light extraction efficiency corresponding to the light emitting units with the different colors can be improved to the maximum degree, and the display effect and the use performance of the display panel are further improved.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the performance of current OLED display products needs to be improved. Summary of the invention

[0004] The embodiments of the present application provide a display panel, a display device and a method for manufacturing a display panel, aiming to improve the performance of the display panel.

[0005] A first aspect of the present application provides a display panel, comprising: a substrate; an isolation structure located on the substrate, the isolation structure enclosing a plurality of isolation openings; a light-emitting layer located on the substrate, the light-emitting layer comprising a plurality of light-emitting units, at least a portion of the light-emitting units being located within corresponding isolation openings; at least one light extraction structure, the at least one light extraction structure being located on a side of at least one of the plurality of light-emitting units facing away from the substrate, the light extraction structure comprising a plurality of light extraction units arranged in a stacked manner, the light extraction units comprising a high refraction layer and a low refraction layer, the low refraction layer being located on a side of the high refraction layer facing away from the substrate, and the refractive index of the high refraction layer being greater than the refractive index of the low refraction layer.

[0006] According to an implementation of the first aspect of the present application, a plurality of light-emitting units include a first light-emitting unit and a second light-emitting unit, a plurality of isolation openings include a first isolation opening and a second isolation opening, the first light-emitting unit is located at the first isolation opening, and the second light-emitting unit is located at the second isolation opening, at least one light extraction structure includes a first light extraction structure and a second light extraction structure, the first light extraction structure is located on a side of the first light-emitting unit away from the substrate, and the second light extraction structure is located on a side of the second light-emitting unit away from the substrate; the first light extraction structure includes a first number of first light extraction units, the second light extraction structure includes a second number of second light extraction units, and the first number is not equal to the second number.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the multiple light-emitting units also include a third light-emitting unit, the multiple isolation openings also include a third isolation opening, the third light-emitting unit is located at the third isolation opening, at least one light extraction structure includes a third light extraction structure, the third light extraction structure is located on the side of the third light-emitting unit away from the substrate, the third light extraction structure includes a third number of third light extraction units, and the first number is not equal to the third number.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the second quantity is not equal to the third quantity.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the plurality of light-emitting units include a first light-emitting unit and a second light-emitting unit, the plurality of isolation openings include a first isolation opening and a second isolation opening, the first light-emitting unit is located at the first isolation opening, and the second light-emitting unit is located at the second isolation opening, and at least one light extraction structure includes a first light extraction structure and a second light extraction structure, the first light extraction structure is located on a side of the first light-emitting unit away from the substrate, and the second light extraction structure is located on a side of the second light-emitting unit away from the substrate; the first light extraction structure includes a first light extraction unit of a first thickness, the second light extraction structure includes a second light extraction unit of a second thickness, and the first thickness is not equal to the second thickness.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the multiple light-emitting units also include a third light-emitting unit, the multiple isolation openings also include a third isolation opening, the third light-emitting unit is located at the third isolation opening, at least one light extraction structure includes a third light extraction structure, the third light extraction structure is located on the side of the third light-emitting unit away from the substrate, the third light extraction structure includes a third light extraction unit of a third thickness, and the first thickness is not equal to the third thickness.

[0011] According to any of the aforementioned embodiments of the first aspect of the present application, the second thickness is not equal to the third thickness.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, the number of the first light extraction units and the number of the second light extraction units are equal.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the first thickness is smaller than the second thickness.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the high-refractive layer in the first isolation opening is smaller than that of the high-refractive layer in the second isolation opening.

[0015] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the low-refractive layer in the first isolation opening is smaller than that of the low-refractive layer in the second isolation opening.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the number of the second light extraction units is equal to the number of the third light extraction units.

[0017] According to any of the aforementioned embodiments of the first aspect of the present application, the second thickness is less than the third thickness.

[0018] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the high-refractive layer in the second isolation opening is smaller than that of the high-refractive layer in the third isolation opening.

[0019] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the low-refractive layer in the second isolation opening is less than that of the low-refractive layer in the third isolation opening.

[0020] According to any of the aforementioned embodiments of the first aspect of the present application, the refractive index of the high refractive layer is 1.6 to 2.5.

[0021] According to any of the aforementioned embodiments of the first aspect of the present application, the refractive index of the low-refractive layer is 1 to 1.5.

[0022] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the high refractive layer in the first isolation opening is 60 nm to 80 nm.

[0023] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the low-refractive layer in the first isolation opening is 110 nm to 130 nm.

[0024] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the high refractive layer in the second isolation opening is 50 nm to 70 nm.

[0025] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the low-refractive layer in the second isolation opening is 90 nm to 110 nm.

[0026] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the high refractive layer in the third isolation opening is 45 nm to 60 nm.

[0027] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the low-refractive layer in the third isolation opening is 80 nm to 100 nm.

[0028] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the high refractive layer includes at least one of a light extraction material, titanium oxide, and zinc sulfide.

[0029] According to any of the aforementioned embodiments of the first aspect of the present application, the low refractive index material includes at least one of lithium fluoride, silicon dioxide, and calcium fluoride.

[0030] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes: a first encapsulation layer located on the side of the light extraction structure facing away from the substrate, the first encapsulation layer includes an encapsulation portion located in the isolation opening, and the encapsulation portion is used to encapsulate the light-emitting unit.

[0031] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the packaging portion in at least part of the isolation opening is different.

[0032] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the packaging portion in at least two of the first isolation opening, the second isolation opening, and the third isolation opening is different.

[0033] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes: a second encapsulation layer located on a side of the first encapsulation layer away from the substrate; and a third encapsulation layer located on a side of the second encapsulation layer away from the substrate.

[0034] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the second encapsulation layer includes an organic material.

[0035] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the third encapsulation layer includes an inorganic material.

[0036] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes: a first electrode layer, including a first electrode located in the isolation opening, the first electrode is located between the light-emitting unit and the light extraction structure and is electrically connected to the isolation structure.

[0037] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the light-emitting unit on the substrate is located within the orthographic projection of the first electrode on the substrate.

[0038] According to any of the aforementioned embodiments of the first aspect of the present application, the light-emitting unit and the isolation structure are spaced apart.

[0039] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the first electrode includes a transparent metal oxide.

[0040] According to any of the aforementioned embodiments of the first aspect of the present application, the isolation structure includes a first layer and a second layer, the second layer is located on the side of the first layer facing away from the substrate, and the orthographic projection of the first layer on the substrate is located within the orthographic projection of the second layer on the substrate.

[0041] According to any of the aforementioned embodiments of the first aspect of the present application, the first layer includes a conductive material.

[0042] According to any of the aforementioned embodiments of the first aspect of the present application, the second layer includes a conductive material or an insulating material.

[0043] According to any of the aforementioned embodiments of the first aspect of the present application, the first layer and the second layer both include metal materials, and the materials of the first layer and the second layer are different.

[0044] According to any of the aforementioned embodiments of the first aspect of the present application, the isolation structure further includes a third layer located on the side of the first layer facing the substrate, and the orthographic projection of the first layer on the substrate is located within the orthographic projection of the third layer on the substrate.

[0045] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes: a pixel definition layer located on the substrate, the pixel definition layer including a pixel defining portion and a pixel opening formed by the pixel defining portion, and the pixel opening and the isolation opening are connected.

[0046] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes a second electrode, the second electrode is located between the substrate and the pixel definition layer, and the second electrode is exposed by the pixel opening.

[0047] A second aspect of the present application provides a display panel, the display panel comprising: a substrate;

[0048] A light-emitting layer is located on the substrate, and the light-emitting layer includes a plurality of light-emitting units;

[0049] At least one light extraction structure, at least one light extraction structure is located on a side of at least one of the multiple light-emitting units that is away from the substrate, the light extraction structure includes a plurality of light extraction units arranged in a stacked manner, the light extraction unit includes a high refraction layer and a low refraction layer, the low refraction layer is located on a side of the high refraction layer that is away from the substrate, and the refractive index of the high refraction layer is greater than the refractive index of the low refraction layer.

[0050] An embodiment of a third aspect of the present application provides a display device, which includes a display panel according to any of the above embodiments.

[0051] An embodiment of a fourth aspect of the present application provides a method for preparing a display panel, including:

[0052] An isolation structure is prepared on the substrate, wherein the isolation structure encloses a plurality of isolation openings;

[0053] A light-emitting layer is prepared on the substrate, wherein the light-emitting layer includes a plurality of light-emitting units, and at least a portion of the light-emitting units is located in the corresponding isolation openings;

[0054] A light extraction structure is prepared on the side of the light-emitting layer facing away from the substrate. The light extraction structure includes a plurality of light extraction units stacked together. The light extraction units include a high refractive layer and a low refractive layer. The low refractive layer is located on the side of the high refractive layer facing away from the substrate. The refractive index of the high refractive layer is greater than that of the low refractive layer.

[0055] According to the display panel of the embodiment of the present application, the display panel includes a substrate, an isolation structure, a light-emitting layer and at least one light extraction structure. The isolation structure is arranged on the substrate and encloses a plurality of isolation openings to separate the light-emitting layer to form mutually disconnected light-emitting units, thereby reducing the crosstalk of carriers in the light-emitting layer, improving the display effect of the display panel, and the preparation of the light-emitting unit does not require the use of a precision mask plate, which can reduce the development and use of precision masks and reduce the preparation cost. At least one light extraction structure is located on at least one side of the plurality of light-emitting units away from the substrate, and the light extraction structure includes a plurality of stacked light extraction units, and the light extraction unit includes a high refractive layer and a low refractive layer, the refractive index of the high refractive layer is greater than the refractive index of the low refractive layer, and the high refractive layer and the low refractive layer constitute a distributed Bragg reflector (Distributed Bragg Reflector, DBR), which has a high light extraction effect and improves the light extraction efficiency of the display panel. At least part of the isolation opening is provided with a plurality of stacked light extraction units, which can adaptively adjust the number of light extraction units corresponding to light emitting units of different colors, so that the light extraction efficiency corresponding to the light emitting units of each color can be maximized, thereby further improving the display effect and performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0057] Figure 1 is a partial cross-sectional view of a display panel provided in an embodiment of the present application;

[0058] Figure 2 is a partial top view of a display panel provided in an embodiment of the present application;

[0059] Figure 3 is a partial cross-sectional view of a display panel in another embodiment;

[0060] Figure 4 is a partial cross-sectional view of a display panel in yet another embodiment;

[0061] Figure 5 is a partial cross-sectional view of a display panel in yet another embodiment;

[0062] Figure 6 is a partial cross-sectional view of a display panel in yet another embodiment;

[0063] Figure 7 is a partial cross-sectional view of a display panel in yet another embodiment;

[0064] Figure 8is a partial cross-sectional view of a display panel in yet another embodiment;

[0065] Fig. 9 is a partial cross-sectional view of a display panel in yet another embodiment;

[0066] Fig.10 It is a schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application.

[0067] Description of reference numerals:

[0068] 10. Display panel;

[0069] 100. Substrate;

[0070] 200, isolation structure; 210, first layer; 220, second layer; 230, third layer; 240, isolation opening; 241, first isolation opening; 242, second isolation opening; 243, third isolation opening;

[0071] 300, light-emitting layer; 310, light-emitting unit; 311, first light-emitting unit; 312, second light-emitting unit; 313, third light-emitting unit;

[0072] 400, first electrode layer; 410, first electrode;

[0073] 500, light extraction unit; 501, first light extraction unit; 502, second light extraction unit; 503, third light extraction unit; 510, high refractive layer; 520, low refractive layer;

[0074] 600, pixel definition layer; 610, pixel definition portion; 620, pixel opening; 630, second electrode;

[0075] 710, first encapsulation layer; 711, encapsulation part; 720, second encapsulation layer; 730, third encapsulation layer. DETAILED DESCRIPTION

[0076] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0078] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0079] Embodiments of the present application provide a display panel, a display device, and a method for manufacturing a display panel. Embodiments of the display panel, the display device, and the method for manufacturing a display panel are described below in conjunction with the accompanying drawings.

[0080] An embodiment of the present application provides a display panel, which may be an organic light emitting diode (OLED) display panel.

[0081] Please also read Figures 1 to 6 , Figure 1 is a partial cross-sectional view of a display panel provided in an embodiment of the present application; Figure 2 is a partial top view of a display panel provided in an embodiment of the present application; Figure 3 is a partial cross-sectional view of a display panel in another embodiment; Figure 4 is a partial cross-sectional view of a display panel in yet another embodiment; Figure 5 is a partial cross-sectional view of a display panel in yet another embodiment; Figure 6 is a partial cross-sectional view of a display panel in yet another embodiment.

[0082] like Figures 1 to 6According to a first aspect of the present application, a display panel 10 is provided. The display panel 10 includes: a substrate 100; an isolation structure 200, which is located on the substrate 100 and encloses a plurality of isolation openings 240; a light-emitting layer 300, which is located on the substrate 100 and includes a plurality of light-emitting units 310, wherein at least a portion of the light-emitting units 310 is located in the corresponding isolation openings 240; and at least one light extraction structure, wherein the at least one light extraction structure is located on a side of at least one of the plurality of light-emitting units 310 that is away from the substrate 100, the light extraction structure includes a plurality of light extraction units 500 that are stacked, and the light extraction unit 500 includes a high-refractive layer 510 and a low-refractive layer 520 located in the isolation openings 240, wherein the low-refractive layer 520 is located on a side of the high-refractive layer 510 that is away from the substrate 100, and the refractive index of the high-refractive layer 510 is greater than the refractive index of the low-refractive layer 520.

[0083] According to the display panel 10 of the embodiment of the present application, the display panel 10 includes a substrate 100, an isolation structure 200, a light-emitting layer 300, and at least one light extraction structure. The isolation structure 200 is disposed on the substrate 100 and encloses a plurality of isolation openings 240 to separate the light-emitting layer 300 to form mutually disconnected light-emitting units 310, thereby reducing the crosstalk of carriers in the light-emitting layer 300, improving the display effect of the display panel 10, and preparing the light-emitting unit 310 does not require the use of a precision mask plate, which can reduce the development and use of the precision mask plate and reduce the preparation cost. At least one light extraction structure is located on at least one side of the plurality of light emitting units 310 away from the substrate 100. The light extraction structure includes a plurality of stacked light extraction units 500. The light extraction unit 500 includes a high refractive layer 510 and a low refractive layer 520. The refractive index of the high refractive layer 510 is greater than the refractive index of the low refractive layer 520. The high refractive layer 510 and the low refractive layer 520 constitute a distributed Bragg reflector DBR, which has a high light extraction effect and improves the light extraction efficiency of the display panel 10. At least part of the isolation opening 240 is provided with a plurality of stacked light extraction units 500, and the number of light extraction units 500 corresponding to light emitting units 310 of different colors can be adaptively adjusted, so that the light extraction efficiency corresponding to the light emitting units 310 of each color can be maximized, further improving the display effect and performance of the display panel 10.

[0084] When light passes through different media, it will be reflected at the interface, and the size of the reflectivity will be related to the size of the refractive index between the media. Therefore, if we stack thin films with different refractive indices interactively and periodically, when light passes through these thin films with different refractive indices, the light reflected back from each layer will constructively interfere due to the change in phase angle, and then combine with each other to obtain strong reflected light. By using the light extraction unit 500, namely DBR, the reflection of light can be reduced within a certain wavelength range, the amount of light transmitted can be increased, and the light extraction efficiency can be improved.

[0085] There are many ways to set the substrate 100. For example, the substrate 100 may include a substrate and an array substrate arranged on the substrate. Alternatively, the substrate 100 is the substrate. Alternatively, the substrate 100 includes a buffer layer and a support plate on a side away from the substrate.

[0086] like Figure 3 As shown, in some optional embodiments, the plurality of light-emitting units 310 include a first light-emitting unit 311 and a second light-emitting unit 312, the plurality of isolation openings 240 include a first isolation opening 241 and a second isolation opening 242, the first light-emitting unit 311 is located at the first isolation opening 241, and the second light-emitting unit 312 is located at the second isolation opening 242, at least one light extraction structure includes a first light extraction structure and a second light extraction structure, the first light extraction structure is located at a side of the first light-emitting unit 311 away from the substrate 100, and the second light extraction structure is located at a side of the second light-emitting unit 312 away from the substrate 100; the first light extraction structure includes a first number of first light extraction units 501, the second light extraction structure includes a second number of second light extraction units 502, and the first number is not equal to the second number.

[0087] In these optional embodiments, the first number is not equal to the second number. For example, the number of first light extraction units 501 arranged in the first isolation opening 241 is greater, so that the light extraction efficiency of the first light-emitting unit 311 in the first isolation opening 241 is further improved; or, the number of second light extraction units 502 arranged in the second isolation opening 242 is greater, so that the light extraction efficiency of the second light-emitting unit 312 in the second isolation opening 242 is further improved.

[0088] like Figure 5 As shown, in some optional embodiments, the multiple light-emitting units 310 also include a third light-emitting unit 313, the multiple isolation openings 240 also include a third isolation opening 243, the third light-emitting unit 313 is located in the third isolation opening 243, at least one light extraction structure includes a third light extraction structure, the third light extraction structure is located on the side of the third light-emitting unit 313 away from the substrate 100, the third light extraction structure includes a third number of third light extraction units 503, and the first number is not equal to the third number.

[0089] In these optional embodiments, the first number is not equal to the third number. For example, the number of second light extraction units 502 arranged in the second isolation opening 242 is greater, so that the light extraction efficiency of the second light-emitting unit 312 in the second isolation opening 242 is further improved; or, the number of third light extraction units 503 arranged in the third isolation opening 243 is greater, so that the light extraction efficiency of the third light-emitting unit 313 in the third isolation opening 243 is further improved.

[0090] like Figure 3 As shown, in some optional embodiments, the first quantity is not equal to the third quantity.

[0091] In these optional embodiments, the first number is not equal to the third number. For example, the number of first light extraction units 501 arranged in the first isolation opening 241 is greater, so that the light extraction efficiency of the first light-emitting unit 311 in the first isolation opening 241 is further improved; or, the number of third light extraction units 503 arranged in the third isolation opening 243 is greater, so that the light extraction efficiency of the third light-emitting unit 313 in the third isolation opening 243 is further improved.

[0092] like Figure 5 and Figure 6 As shown, in some optional embodiments, the plurality of light-emitting units 310 include a first light-emitting unit 311 and a second light-emitting unit 312, the plurality of isolation openings 240 include a first isolation opening 241 and a second isolation opening 242, the first light-emitting unit 311 is located at the first isolation opening 241, and the second light-emitting unit 312 is located at the second isolation opening 242, at least one light extraction structure includes a first light extraction structure and a second light extraction structure, the first light extraction structure is located at a side of the first light-emitting unit 311 away from the substrate 100, and the second light extraction structure is located at a side of the second light-emitting unit 312 away from the substrate 100; the first light extraction structure includes a first light extraction unit 501 of a first thickness, the second light extraction structure includes a second light extraction unit 502 of a second thickness, and the first thickness is not equal to the second thickness.

[0093] In these optional embodiments, the first thickness is not equal to the second thickness, for example, the thickness of the first light extraction unit 501 arranged in the first isolation opening 241 is larger; or, the thickness of the second light extraction unit 502 arranged in the second isolation opening 242 is larger, and the thickness of the light extraction unit 500 is different from the thickness of the light extraction unit 500 in at least part of the isolation opening 240, and the wavelength that can improve the light extraction efficiency is also different. Since the first light-emitting unit 311, the second light-emitting unit 312 and the third light-emitting unit 313 have different colors and different wavelengths, in order to improve the light extraction efficiency of light with different wavelengths, the thickness of the light extraction unit 500 corresponding to the light-emitting units 310 of different colors is adaptively adjusted, so that the light extraction efficiency corresponding to the light-emitting units 310 of each color can be maximized, thereby further improving the display effect and performance of the display panel 10.

[0094] Optionally, the multiple light-emitting units 310 also include a third light-emitting unit 313, the multiple isolation openings 240 also include a third isolation opening 243, the third light-emitting unit 313 is located in the third isolation opening 243, at least one light extraction structure includes a third light extraction structure, the third light extraction structure is located on the side of the third light-emitting unit 313 away from the substrate 100, the third light extraction structure includes a third light extraction unit 503 of a third thickness, the first thickness is not equal to the third thickness, for example, the thickness of the second light extraction unit 502 arranged in the second isolation opening 242 is larger; or, the thickness of the third light extraction unit 503 arranged in the third isolation opening 243 is larger.

[0095] like Figure 5 As shown, in some optional embodiments, the number of the first light extraction units 501 and the number of the second light extraction units 502 are equal.

[0096] In these optional embodiments, when the number of the first light extraction units 501 of the first isolation opening 241 and the second light extraction units 502 of the second isolation opening 242 are equal, the thickness of the first light extraction units 501 of the first isolation opening 241 and the second light extraction units 502 of the second isolation opening 242 are adjusted by controlling the variable method, so that the light extraction efficiency corresponding to the first light-emitting unit 311 and the second light-emitting unit 312 can be maximized, thereby further improving the display effect and performance of the display panel 10.

[0097] For example, in some optional embodiments, the first thickness is less than the second thickness.

[0098] In these optional embodiments, the first thickness is less than the second thickness, that is, the thickness of the first light extraction unit 501 in the first isolation opening 241 is less than the thickness of the second light extraction unit 502 in the second isolation opening 242. The first light emitting unit 311 is a red light emitting unit 310, and the second light emitting unit 312 is a green light emitting unit 310. The wavelength of red light is greater than that of green light. Therefore, the thickness of the second light extraction unit 502 in the second isolation opening 242 is set to be larger, so that the first light extraction unit 501 in the first isolation opening 241 and the second light extraction unit 502 in the second isolation opening 242 can both improve the light extraction efficiency.

[0099] In some optional embodiments, the thickness of the high-refractive layer 510 in the first isolation opening 241 is smaller than that of the high-refractive layer 510 in the second isolation opening 242 .

[0100] In these optional embodiments, the first light-emitting unit 311 is a red light-emitting unit 310, and the second light-emitting unit 312 is a green light-emitting unit 310. The wavelength of red light is greater than the wavelength of filtered light, so the thickness of the light extraction unit 500 in the second isolation opening 242 is set to be larger. The light extraction unit 500 is composed of a high-refractive layer 510 and a low-refractive layer 520. In order to increase the thickness of the light extraction unit 500, the thickness of the high-refractive layer 510 can be increased. Therefore, the thickness of the high-refractive layer 510 in the second isolation opening 242 is set to be larger, so that the light extraction units 500 in the first isolation opening 241 and the second isolation opening 242 can both better improve the light extraction efficiency.

[0101] In some optional embodiments, the thickness of the low-refractive layer 520 in the first isolation opening 241 is smaller than that of the low-refractive layer 520 in the second isolation opening 242 .

[0102] In these optional embodiments, the first light-emitting unit 311 is a red light-emitting unit 310, and the second light-emitting unit 312 is a green light-emitting unit 310. The wavelength of red light is greater than the wavelength of filtered light, so the thickness of the light extraction unit 500 in the second isolation opening 242 is set to be larger. The light extraction unit 500 is composed of a high-refractive layer 510 and a low-refractive layer 520. In order to increase the thickness of the light extraction unit 500, the thickness of the high-refractive layer 510 can be increased. Therefore, the thickness of the low-refractive layer 520 in the second isolation opening 242 is set to be larger, so that the light extraction units 500 in the first isolation opening 241 and the second isolation opening 242 can both better improve the light extraction efficiency.

[0103] like Figure 6 As shown, in some optional embodiments, the number of the second light extraction units 502 in the second isolation opening 242 and the number of the third light extraction units 503 in the third isolation opening 243 are equal.

[0104] In these optional embodiments, when the number of the second light extraction units 502 in the second isolation opening 242 and the third light extraction units 503 in the third isolation opening 243 is equal, the thickness of the second light extraction units 502 in the second isolation opening 242 and the third light extraction units 503 in the third isolation opening 243 are adjusted by controlling the variable method, so that the light extraction efficiency corresponding to the second light-emitting unit 312 and the third light-emitting unit 313 can be maximized, thereby further improving the display effect and performance of the display panel 10.

[0105] For example, in some optional embodiments, the thickness of the second light extraction unit 502 in the second isolation opening 242 is smaller than that of the third light extraction unit 503 in the third isolation opening 243 .

[0106] In these optional embodiments, the second light-emitting unit 312 is a green light-emitting unit 310, and the third light-emitting unit 313 is a blue light-emitting unit 310. The wavelength of green light is greater than the wavelength of blue light. Therefore, the thickness of the third light extraction unit 503 in the third isolation opening 243 is set to be larger, which can enable the second light extraction unit 502 of the second isolation opening 242 and the third light extraction unit 503 of the third isolation opening 243 to better improve the light extraction efficiency.

[0107] In some optional embodiments, the thickness of the high-refractive layer 510 in the second isolation opening 242 is smaller than that of the high-refractive layer 510 in the third isolation opening 243 .

[0108] In these optional embodiments, the second light-emitting unit 312 is a green light-emitting unit 310, and the third light-emitting unit 313 is a blue light-emitting unit 310. The wavelength of green light is greater than that of blue light. Therefore, the thickness of the light extraction unit 500 in the third isolation opening 243 is set to be larger. The light extraction unit 500 is composed of a high-refractive layer 510 and a low-refractive layer 520. In order to increase the thickness of the light extraction unit 500, the thickness of the high-refractive layer 510 can be increased. Therefore, the thickness of the high-refractive layer 510 in the third isolation opening 243 is set to be larger, which can enable the light extraction units 500 in the second isolation opening 242 and the third isolation opening 243 to better improve the light extraction efficiency.

[0109] In some optional embodiments, the thickness of the low-refractive layer 520 in the second isolation opening 242 is smaller than that of the low-refractive layer 520 in the third isolation opening 243 .

[0110] In these optional embodiments, the second light-emitting unit 312 is a green light-emitting unit 310, and the third light-emitting unit 313 is a blue light-emitting unit 310. The wavelength of green light is greater than that of blue light. Therefore, the thickness of the light extraction unit 500 in the third isolation opening 243 is set to be larger. The light extraction unit 500 is composed of a high-refractive layer 510 and a low-refractive layer 520. In order to increase the thickness of the light extraction unit 500, the thickness of the high-refractive layer 510 can be increased. Therefore, the thickness of the low-refractive layer 520 in the third isolation opening 243 is set to be larger, so that the light extraction units 500 in the second isolation opening 242 and the third isolation opening 243 can better improve the light extraction efficiency.

[0111] When the difference in refractive index between the high refractive layer 510 and the low refractive layer 520 becomes very small, the light is like traveling in the same medium, and the reflection coefficient becomes very small. The interference effect caused by the multiple interference of light is very obvious, so when the difference in refractive index between the high refractive layer 510 and the low refractive layer 520 in the DBR is reduced, the light extraction capability of the DBR can be improved.

[0112] In some optional embodiments, the refractive index of the high-refractive layer 510 is 1.6-2.5, for example, the refractive index of the high-refractive layer 510 is 1.6, 2.0, 2.25, 2.5, etc.

[0113] In these optional embodiments, the refractive index of the high refractive layer 510 is greater than or equal to 1.6, which can improve the problem that the refractive index of the high refractive layer 510 is too low, resulting in the refractive index of the high refractive layer 510 not being greater than the refractive index of the low refractive layer 520, the high refractive layer 510 and the low refractive layer 520 cannot form a DBR, and the light reaching the light extraction unit 500 is prone to total reflection, resulting in reduced light extraction efficiency of the display panel 10. The refractive index of the high refractive layer 510 is less than or equal to 2.5, which can improve the problem that the refractive index of the high refractive layer 510 is too large, resulting in a large difference in the refractive index between the high refractive layer 510 and the low refractive layer 520, and reduced light extraction effect of the DBR.

[0114] In some optional embodiments, the refractive index of the low-refractive layer 520 is 1-1.5, for example, the refractive index of the high-refractive layer 510 is 1, 1.2, 1.3, 1.5, etc.

[0115] In these optional embodiments, the refractive index of the low refractive layer 520 is greater than or equal to 1, which can improve the problem that the refractive index of the low refractive layer 520 is too low, resulting in a large difference in the refractive index between the high refractive layer 510 and the low refractive layer 520, and the light extraction effect of the DBR is reduced. The refractive index of the low refractive layer 520 is less than or equal to 1.5, which can improve the problem that the refractive index of the low refractive layer 520 is too large, resulting in the refractive index of the high refractive layer 510 cannot be greater than the refractive index of the low refractive layer 520, the high refractive layer 510 and the low refractive layer 520 cannot form a DBR, and the light reaching the light extraction unit 500 is prone to total reflection, which reduces the light extraction efficiency of the display panel 10.

[0116] In some optional embodiments, the thickness of the high refractive layer 510 in the first isolation opening 241 is 60 nm-80 nm, for example, the thickness of the high refractive layer 510 in the first isolation opening 241 is 60 nm, 65 nm, 70 nm, 80 nm, etc.

[0117] In these optional embodiments, the thickness of the high refractive layer 510 in the first isolation opening 241 is between 60 nm and 80 nm, so that the red light emitted by the first light emitting unit 311 in the first isolation opening 241 can pass more through the high refractive layer 510 to improve the light extraction efficiency of the first light emitting unit 311.

[0118] In some optional embodiments, the thickness of the low-refractive layer 520 in the first isolation opening 241 is 110 nm to 130 nm, for example, the thickness of the low-refractive layer 520 in the first isolation opening 241 is 110 nm, 120 nm, 125 nm, 130 nm, etc.

[0119] In these optional embodiments, the thickness of the low-refractive layer 520 in the first isolation opening 241 is between 110 nm and 130 nm, so that more red light emitted by the first light-emitting unit 311 in the first isolation opening 241 can pass through the low-refractive layer 520 to improve the light extraction efficiency of the first light-emitting unit 311.

[0120] In some optional embodiments, the thickness of the high refractive layer 510 in the second isolation opening 242 is 50 nm to 70 nm, for example, the thickness of the high refractive layer 510 in the second isolation opening 242 is 50 nm, 60 nm, 65 nm, 70 nm, etc.

[0121] In these optional embodiments, the thickness of the high refractive layer 510 in the second isolation opening 242 is between 50 nm and 70 nm, so that more green light emitted by the second light emitting unit 312 in the second isolation opening 242 can pass through the high refractive layer 510 to improve the light extraction efficiency of the second light emitting unit 312.

[0122] In some optional embodiments, the thickness of the low-refractive layer 520 in the second isolation opening 242 is 90 nm-110 nm, for example, the thickness of the low-refractive layer 520 in the second isolation opening 242 is 90 nm, 100 nm, 105 nm, 110 nm, etc.

[0123] In these optional embodiments, the thickness of the low-refractive layer 520 in the second isolation opening 242 is between 90 nm and 110 nm, so that more green light emitted by the second light-emitting unit 312 in the second isolation opening 242 can pass through the low-refractive layer 520 to improve the light extraction efficiency of the second light-emitting unit 312.

[0124] In some optional embodiments, the thickness of the high refractive layer 510 in the third isolation opening 243 is 45 nm-60 nm, for example, the thickness of the high refractive layer 510 in the third isolation opening 243 is 45 nm, 50 nm, 55 nm, 60 nm, etc.

[0125] In these optional embodiments, the thickness of the high refractive layer 510 in the third isolation opening 243 is between 45 nm and 60 nm, so that more blue light emitted by the third light emitting unit 313 in the third isolation opening 243 can pass through the high refractive layer 510 to improve the light extraction efficiency of the third light emitting unit 313.

[0126] In some optional embodiments, the thickness of the low-refractive layer 520 in the third isolation opening 243 is 80 nm-100 nm, for example, the thickness of the low-refractive layer 520 in the third isolation opening 243 is 80 nm, 85 nm, 90 nm, 100 nm, etc.

[0127] In these optional embodiments, the thickness of the low-refractive layer 520 in the third isolation opening 243 is between 80 nm and 100 nm, so that more blue light emitted by the third light-emitting unit 313 in the third isolation opening 243 can pass through the low-refractive layer 520 to improve the light extraction efficiency of the third light-emitting unit 313.

[0128] In some optional embodiments, the material of the high refractive layer 510 includes at least one of a light extraction material, titanium oxide, and zinc sulfide.

[0129] Optionally, the low refractive index material includes at least one of lithium fluoride, silicon dioxide, and calcium fluoride.

[0130] In these optional embodiments, when the material of the high refractive layer 510 is a light extraction material, the material of the low refractive layer 520 can be lithium fluoride; when the material of the high refractive layer 510 is titanium oxide, the material of the low refractive layer 520 can be silicon dioxide; when the material of the high refractive layer 510 is zinc sulfide, the material of the low refractive layer 520 can be calcium fluoride. When the high refractive layer 510 and the low refractive layer 520 are made of these materials, they can have relatively matched refractive indices to form a DBR, thereby improving the light extraction efficiency of the display panel 10.

[0131] See also Figure 7 , Figure 7 is a partial cross-sectional view of a display panel in yet another embodiment.

[0132] like Figure 7 As shown, in some optional embodiments, the display panel 10 further includes: a first encapsulation layer 710 located on the side of the light extraction structure facing away from the substrate 100 , the first encapsulation layer 710 includes an encapsulation portion 711 located in the isolation opening 240 , and the encapsulation portion 711 is used to encapsulate the light-emitting unit 310 .

[0133] In these optional embodiments, the first encapsulation layer 710 includes encapsulation portions 711 spaced apart from each other, and at least a portion of the encapsulation portions 711 is located in the isolation opening 240 to encapsulate the light emitting unit 310 .

[0134] In some optional embodiments, the thickness of the packaging portion 711 in at least some of the isolation openings 240 is different. For example, the thickness of the packaging portion 711 in at least two of the first isolation opening 241 , the second isolation opening 242 , and the third isolation opening 243 is different.

[0135] In these optional embodiments, by adjusting the thickness of the packaging part 711 corresponding to each light-emitting unit 310, the thickness of the packaging part 711 of the light-emitting unit 310 can be adjusted individually, so that the light extraction efficiency of each light-emitting unit 310 through the packaging part 711 is improved. In addition, providing packaging parts 711 with different thicknesses is also conducive to improving the color shift phenomenon of the display panel 10.

[0136] In some optional embodiments, the material of the first encapsulation layer 710 includes an inorganic material.

[0137] In these optional embodiments, the first encapsulation layer 710 includes an inorganic material, which has good density and good barrier properties against water vapor and oxygen.

[0138] Optionally, the display panel 10 further includes: a second encapsulation layer 720, located on the side of the first encapsulation layer 710 away from the substrate 100, the second encapsulation layer 720 is in contact with the isolation structure 200; and a third encapsulation layer 730, located on the side of the second encapsulation layer 720 away from the substrate 100. The display panel 10 adopts three-layer encapsulation, has good encapsulation performance, and reduces the possibility of water and oxygen intrusion.

[0139] Optionally, the material of the second encapsulation layer 720 includes an organic material.

[0140] Optionally, the material of the third encapsulation layer 730 includes an inorganic material. The first encapsulation layer 710, the second encapsulation layer 720 and the third encapsulation layer 730 are respectively encapsulated with an inorganic material, an organic material and an inorganic material to form a TFE (Thin Film Encapsulation, TFE) thin film encapsulation structure to further improve the encapsulation performance.

[0141] In some optional embodiments, the display panel 10 further includes: a first electrode layer 400 including a first electrode 410 located in the isolation opening 240 , the first electrode 410 is located between the light emitting unit 310 and the light extraction structure and is electrically connected to the isolation structure 200 .

[0142] In these optional embodiments, the isolation structure 200 separates the first electrode layer 400 to form mutually spaced first electrodes 410 , and the mutually spaced first electrodes 410 are electrically connected through the isolation structure 200 to form a full-surface electrode, thereby ensuring normal light emission of the light-emitting unit 310 .

[0143] Optionally, the orthographic projection of the light emitting unit 310 on the substrate 100 is located within the orthographic projection of the first electrode 410 on the substrate 100, that is, the first electrode 410 is arranged to cover the light emitting unit 310 to serve as an electrode of the light emitting unit 310, thereby ensuring the normal light emission of the light emitting unit 310 and improving the display effect of the display panel 10. In some optional embodiments, the light emitting unit 310 is spaced apart from the isolation structure 200.

[0144] Optionally, the light-emitting unit 310 and the isolation structure 200 are spaced apart, that is, the light-emitting units 310 are spaced apart from each other, so as to reduce the crosstalk of carriers between the light-emitting units 310 and improve the cross-color problem of the light-emitting units 310 .

[0145] Optionally, the material of the first electrode 410 includes a transparent metal oxide, such as ITO or IZO. The transparent metal oxide can reduce SPPs (surface plasmon polaritons) light loss at the metal interface, further improving the light extraction efficiency of the display panel 10 .

[0146] Optionally, the first layer 210 includes a conductive material, and the first layer 210 is connected to the first electrode 410 to achieve electrical connection between the isolation structure 200 and the first electrode 410 .

[0147] In some optional embodiments, the second layer 220 includes a conductive material or an insulating material.

[0148] In these optional embodiments, the second layer 220 includes a conductive material, for example, the second layer 220 includes a non-metallic conductive material or a metallic conductive material. When the second layer 220 is a non-metallic conductive material or an insulating material, the second layer 220 is difficult to be etched during wet etching of the first layer 210 using an etching solution, so that the first layer 210 is more easily concavely arranged relative to the second layer 220.

[0149] In some optional embodiments, both the first layer 210 and the second layer 220 include metal materials, and the materials of the first layer 210 and the second layer 220 are different.

[0150] In these optional embodiments, when both the first layer 210 and the second layer 220 are made of metal materials, the first layer 210 may be wet-etched with an etching solution, and the etching rate of the second layer 220 may be set to be lower than the etching rate of the first layer 210 by setting the etching solution. Since the etching rate of the first layer 210 is relatively high, when the etching solution is used for wet etching, even if the second layer 220 is etched to a certain extent, the first layer 210 is etched faster, so that the first layer 210 is set concave relative to the second layer 220.

[0151] See also Figure 8 , Figure 8 is a partial cross-sectional view of a display panel in yet another embodiment.

[0152] like Figure 8As shown, in some optional embodiments, the isolation structure 200 further includes a third layer 230 located on the side of the first layer 210 facing the substrate 100, and the orthographic projection of the first layer 210 on the substrate 100 is located within the orthographic projection of the third layer 230 on the substrate 100. Among them, patents with application numbers PCT / CN2023 / 134518, 202310771124.9, 202311499823.9, and 202311616249.0 record relevant contents of the isolation structure 200 for reference.

[0153] In these optional embodiments, in order to obtain the first layer 210 with a concave setting, the first layer 210 has a faster etching rate than the second layer 220 and the third layer 230 during the etching process, thereby forming the concave first layer 210. Since the etching rate of the first layer 210 is faster, the waste generated by etching is more likely to enter other positions of the display panel 10, thereby causing adverse effects. After the third layer 230 is set, the first layer 210 can be well attached to the third layer 230, and the generated etching waste falls on the third layer 230, which is easy to clean.

[0154] In these optional embodiments, the pixel defining portion 610 of the pixel defining layer 600 encloses a pixel opening 620 to set the light emitting unit 310 and realize normal light emission of the light emitting unit 310. In addition, the pixel defining portion 610 defines the setting area of ​​each light emitting unit 310 to reduce the cross-color defect between each light emitting unit 310.

[0155] Optionally, the display panel 10 further includes a second electrode 630, and the second electrode 630 is exposed by the pixel opening 620. One of the second electrode 630 and the first electrode 410 serves as the anode of the light-emitting unit 310, and the other serves as the cathode of the light-emitting unit 310. In the embodiment of the present application, the second electrode 630 is used as the anode of the light-emitting unit 310, and the first electrode 410 is used as the cathode of the light-emitting unit 310 for illustration.

[0156] Optionally, the light emitting layer 300 includes an electron injection layer (EIL), an electron transport layer (ETL), a light emitting material layer, a hole injection layer (HIL) and a hole transport layer (HTL). Adding the light extraction unit 500, i.e., the DBR structure, will change the wavelength and color of the emitted light, and the thickness of the electron transport layer (ETL) or the hole transport layer (HTL) in the light emitting layer 300 can be adjusted to maintain the wavelength and color of the emitted light.

[0157] See also Fig. 9 , Fig. 9 is a partial cross-sectional view of a display panel in yet another embodiment.

[0158] like Fig. 9As shown, the second aspect of the present application provides a display panel 10, which includes: a substrate 100; a light-emitting layer 300, which is located on the substrate 100, and the light-emitting layer 300 includes a plurality of light-emitting units 310 spaced apart from each other; at least one light extraction structure, and the at least one light extraction structure is located on a side of at least one of the plurality of light-emitting units 310 away from the substrate 100, and the light extraction structure includes a plurality of light extraction units 500 arranged in a stacked manner, and the light extraction unit 500 includes a high-refractive layer 510 and a low-refractive layer 520, and the low-refractive layer 520 is located on a side of the high-refractive layer 510 away from the substrate 100, and the refractive index of the high-refractive layer 510 is greater than the refractive index of the low-refractive layer 520.

[0159] According to the display panel 10 of the embodiment of the present application, the display panel 10 includes a substrate 100, a light emitting layer 300 and a light extraction structure. At least one light extraction structure is located on at least one side of the plurality of light emitting units 310 away from the substrate 100, and the light extraction structure includes a plurality of stacked light extraction units 500, the light extraction unit 500 includes a high refractive layer 510 and a low refractive layer 520, the refractive index of the high refractive layer 510 is greater than the refractive index of the low refractive layer 520, and the high refractive layer 510 and the low refractive layer 520 constitute a distributed Bragg reflector (Distributed Bragg Reflector, DBR), which has a high light extraction effect and improves the light extraction efficiency of the display panel 10. At least part of the isolation opening 240 is provided with a plurality of stacked light extraction units 500, which can adaptively adjust the number of light extraction units 500 corresponding to light emitting units 310 of different colors, so that the light extraction efficiency corresponding to the light emitting units 310 of each color can be maximized, further improving the display effect and use performance of the display panel 10.

[0160] The structural design in this embodiment can be applied to other display panels 10 , and the specific selection can be made according to actual conditions, and this application does not impose any specific restrictions on it.

[0161] The embodiment of the third aspect of the present application further provides a display device, comprising the display panel 10 of any of the above embodiments. Since the display device provided by the embodiment of the third aspect of the present application comprises the display panel 10 of any of the above embodiments, the display device provided by the embodiment of the third aspect of the present application has the beneficial effects of the display panel 10 of any of the above embodiments, which will not be described in detail here.

[0162] The display device in the embodiments of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles, and other devices with display functions.

[0163] See also Fig.10 , Fig.10 It is a schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application.

[0164] The fourth aspect of the present application also provides a method for preparing a display panel 10. The display panel 10 may be the display panel 10 provided by any of the above embodiments. Figures 1 to 9 , the preparation method comprises:

[0165] Step S01: preparing an isolation structure on a substrate, wherein the isolation structure encloses a plurality of isolation openings.

[0166] Step S02: preparing a light-emitting layer on a substrate, wherein the light-emitting layer comprises a plurality of light-emitting units, and at least a portion of the light-emitting units is located in corresponding isolation openings.

[0167] Step S03: Prepare a light extraction structure on the side of the light-emitting layer facing away from the substrate, the light extraction structure includes a plurality of light extraction units stacked together, the light extraction unit includes a high refraction layer and a low refraction layer, the low refraction layer is located on the side of the high refraction layer facing away from the substrate, and the refractive index of the high refraction layer is greater than the refractive index of the low refraction layer.

[0168] According to the preparation method of the third aspect of the present application, an isolation structure 200 is prepared by step S01. A light-emitting layer 300 is prepared by step S02. The isolation structure 200 is arranged on the substrate 100 and encloses a plurality of isolation openings 240 to separate the light-emitting layer 300 to form mutually disconnected light-emitting units 310, thereby reducing the crosstalk of carriers in the light-emitting layer 300, improving the display effect of the display panel 10, and the preparation of the light-emitting unit 310 can be prepared without using a precision mask plate, which can reduce the development and use of precision masks and reduce the preparation cost. A light extraction structure is prepared by step S03. The light extraction structure includes a plurality of light extraction units 500 stacked and arranged, and the light extraction unit 500 includes a high refractive layer 510 and a low refractive layer 520, the refractive index of the high refractive layer 510 is greater than the refractive index of the low refractive layer 520, and the high refractive layer 510 and the low refractive layer 520 constitute a distributed Bragg reflector (Distributed Bragg Reflector, DBR), which has a high light extraction effect and improves the light extraction efficiency of the display panel 10. At least part of the isolation opening 240 is provided with a plurality of stacked light extraction units 500, which can adaptively adjust the number of light extraction units 500 corresponding to different color light emitting units 310, so that the light extraction efficiency corresponding to each color light emitting unit 310 can be maximized, thereby further improving the display effect and performance of the display panel 10.

[0169] According to the embodiments described above in the present application, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; An isolation structure, located on the substrate, the isolation structure encloses a plurality of isolation openings; A light-emitting layer, located on the substrate, the light-emitting layer includes a plurality of light-emitting units, at least a portion of the light-emitting units are located in the corresponding isolation openings; At least one light extraction structure, wherein the at least one light extraction structure is located on a side of at least one of the multiple light-emitting units away from the substrate, the light extraction structure includes a plurality of light extraction units arranged in a stacked manner, the light extraction unit includes a high refraction layer and a low refraction layer, the low refraction layer is located on a side of the high refraction layer away from the substrate, and the refractive index of the high refraction layer is greater than the refractive index of the low refraction layer.

2. The display panel according to claim 1, characterized in that: The plurality of light-emitting units include a first light-emitting unit and a second light-emitting unit, the plurality of isolation openings include a first isolation opening and a second isolation opening, the first light-emitting unit is located at the first isolation opening, the second light-emitting unit is located at the second isolation opening, the at least one light extraction structure includes a first light extraction structure and a second light extraction structure, the first light extraction structure is located at a side of the first light-emitting unit away from the substrate, and the second light extraction structure is located at a side of the second light-emitting unit away from the substrate; The first light extraction structure includes a first number of first light extraction units, and the second light extraction structure includes a second number of second light extraction units, wherein the first number is not equal to the second number; Preferably, the plurality of light-emitting units further include a third light-emitting unit, the plurality of isolation openings further include a third isolation opening, the third light-emitting unit is located at the third isolation opening, the at least one light extraction structure includes a third light extraction structure, the third light extraction structure is located at a side of the third light-emitting unit away from the substrate, the third light extraction structure includes a third number of third light extraction units, and the first number is not equal to the third number; Preferably, the second quantity is not equal to the third quantity.

3. The display panel according to claim 1, characterized in that: The plurality of light-emitting units include a first light-emitting unit and a second light-emitting unit, the plurality of isolation openings include a first isolation opening and a second isolation opening, the first light-emitting unit is located at the first isolation opening, the second light-emitting unit is located at the second isolation opening, the at least one light extraction structure includes a first light extraction structure and a second light extraction structure, the first light extraction structure is located at a side of the first light-emitting unit away from the substrate, and the second light extraction structure is located at a side of the second light-emitting unit away from the substrate; The first light extraction structure includes a first light extraction unit with a first thickness, the second light extraction structure includes a second light extraction unit with a second thickness, and the first thickness is not equal to the second thickness; Preferably, the plurality of light-emitting units further include a third light-emitting unit, the plurality of isolation openings further include a third isolation opening, the third light-emitting unit is located at the third isolation opening, the at least one light extraction structure includes a third light extraction structure, the third light extraction structure is located at a side of the third light-emitting unit away from the substrate, the third light extraction structure includes a third light extraction unit of a third thickness, and the first thickness is not equal to the third thickness; Preferably, the second thickness is not equal to the third thickness.

4. The display panel according to claim 3, characterized in that: The number of the first light extraction units and the number of the second light extraction units are equal; Preferably, the first thickness is smaller than the second thickness; Preferably, the thickness of the high-refractive layer in the first isolation opening is smaller than that of the high-refractive layer in the second isolation opening; Preferably, the thickness of the low-refractive layer in the first isolation opening is smaller than that of the low-refractive layer in the second isolation opening.

5. The display panel according to claim 3, characterized in that: The number of the second light extraction units is equal to the number of the third light extraction units; Preferably, the second thickness is smaller than the third thickness; Preferably, the thickness of the high-refractive layer in the second isolation opening is smaller than that of the high-refractive layer in the third isolation opening; Preferably, the thickness of the low-refractive layer in the second isolation opening is smaller than that of the low-refractive layer in the third isolation opening.

6. The display panel according to claim 1, characterized in that: The refractive index of the high refractive layer is 1.6 to 2.5; Preferably, the refractive index of the low-refractive layer is 1 to 1.

5.

7. The display panel according to claim 3, characterized in that: The thickness of the high refractive layer in the first isolation opening is 60nm to 80nm; Preferably, the thickness of the low refractive layer in the first isolation opening is 110 nm to 130 nm; Preferably, the thickness of the high refractive layer in the second isolation opening is 50nm to 70nm; Preferably, the thickness of the low refractive layer in the second isolation opening is 90nm to 110nm; Preferably, the thickness of the high refractive layer in the third isolation opening is 45 nm to 60 nm; Preferably, the thickness of the low-refractive layer in the third isolation opening is 80 nm to 100 nm.

8. The display panel according to claim 1, characterized in that: The material of the high refractive layer includes at least one of a light extraction material, titanium oxide, and zinc sulfide; Preferably, the low refractive index material includes at least one of lithium fluoride, silicon dioxide and calcium fluoride.

9. The display panel according to claim 2, characterized in that: Also includes: A first encapsulation layer is located on a side of the light extraction structure away from the substrate, the first encapsulation layer comprises an encapsulation portion located in the isolation opening, the encapsulation portion is used to encapsulate the light-emitting unit; Preferably, the thickness of the packaging portion in at least part of the isolation opening is different; Preferably, the thickness of the packaging portion in at least two of the first isolation opening, the second isolation opening and the third isolation opening is different; Preferably, the material of the first encapsulation layer includes an inorganic material; Preferably, the display panel further includes: a second encapsulation layer, located on a side of the first encapsulation layer away from the substrate; a third encapsulation layer, located on a side of the second encapsulation layer away from the substrate; Preferably, the material of the second encapsulation layer includes organic material; Preferably, the material of the third encapsulation layer includes inorganic material.

10. The display panel according to claim 1, characterized in that: The display panel further includes: A first electrode layer, comprising a first electrode located in the isolation opening, the first electrode being located between the light emitting unit and the light extraction structure and being electrically connected to the isolation structure; Preferably, the orthographic projection of the light emitting unit on the substrate is located within the orthographic projection of the first electrode on the substrate; Preferably, the light emitting unit and the isolation structure are spaced apart; Preferably, the material of the first electrode includes transparent metal oxide.

11. The display panel according to claim 1, characterized in that: The isolation structure comprises a first layer and a second layer, wherein the second layer is located on a side of the first layer away from the substrate, and an orthographic projection of the first layer on the substrate is located within an orthographic projection of the second layer on the substrate; Preferably, the first layer comprises a conductive material; Preferably, the second layer comprises a conductive material or an insulating material; Preferably, the first layer and the second layer both comprise metal materials, and the materials of the first layer and the second layer are different; Preferably, the isolation structure further comprises a third layer located on a side of the first layer facing the substrate, and an orthographic projection of the first layer on the substrate is located within an orthographic projection of the third layer on the substrate; Preferably, the display panel further includes: A pixel definition layer, located on the substrate, the pixel definition layer comprises a pixel definition portion and a pixel opening formed by the pixel definition portion, the pixel opening is connected to the isolation opening; Preferably, the display panel further includes a second electrode, wherein the second electrode is located between the substrate and the pixel definition layer, and the second electrode is exposed from the pixel opening.

12. A display panel, characterized in that: The display panel comprises: substrate; A light-emitting layer, located on the substrate, comprising a plurality of light-emitting units; At least one light extraction structure, wherein the at least one light extraction structure is located on a side of at least one of the multiple light-emitting units away from the substrate, the light extraction structure includes a plurality of light extraction units arranged in a stacked manner, the light extraction unit includes a high refraction layer and a low refraction layer, the low refraction layer is located on a side of the high refraction layer away from the substrate, and the refractive index of the high refraction layer is greater than the refractive index of the low refraction layer.

13. A display device, characterized in that: A display panel comprising any one of claims 1 to 12.

14. A method for preparing a display panel, characterized in that: include: Preparing an isolation structure on a substrate, wherein the isolation structure encloses a plurality of isolation openings; Preparing a light-emitting layer on the substrate, wherein the light-emitting layer includes a plurality of light-emitting units, and at least a portion of the light-emitting units is located in the corresponding isolation openings; A light extraction structure is prepared on the side of the light-emitting layer away from the substrate, the light extraction structure includes a plurality of light extraction units stacked together, the light extraction units include a high refractive layer and a low refractive layer, the low refractive layer is located on the side of the high refractive layer away from the substrate, and the refractive index of the high refractive layer is greater than the refractive index of the low refractive layer.

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