Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a via hole area, a main screen area located on the periphery of the via hole area, a substrate, a light emitting layer and a light extraction layer. The light extraction layer is arranged on the side, away from the substrate, of the light emitting layer and comprises a first light extraction layer located in the via hole area and a second light extraction layer located in the main screen area, the first light extraction layer comprises multiple first light extraction sub-layers arranged in a stacked mode, and the refractive indexes of every two adjacent first light extraction sub-layers are different; and the first light extraction sub-layer farthest from the substrate is of a lens structure. The display panel provided by the invention can improve the transmittance of the via hole area.

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] With the development of display technology, the requirements for display panels are getting higher and higher. Display panel screens have the characteristics of simple structure, low power consumption, high contrast, thin thickness, bright colors, wide viewing angle, fast response speed, and wide operating temperature range. They are now widely used in commercial fields, communications fields, computer fields, consumer electronics fields, as well as industrial and transportation fields.

[0003] However, current display panels have low transmittance. Summary of the invention

[0004] The present application provides a display panel and a display device, which can improve the transmittance of a via hole area of ​​the display panel.

[0005] A first aspect of an embodiment of the present application provides a display panel, comprising: a via area and a main screen area located outside the via area, a substrate, a light-emitting layer and a light extraction layer; the light extraction layer is arranged on the side of the light-emitting layer away from the substrate, comprising a first light extraction layer located in the via area and a second light extraction layer located in the main screen area, wherein the first light extraction layer comprises a plurality of first light extraction sublayers stacked together, and the refractive indices of two adjacent first light extraction sublayers are different, and the first light extraction sublayer farthest from the substrate is in a lens structure.

[0006] A second aspect of an embodiment of the present application provides a display device, comprising a display panel in any one of the above-mentioned implementations.

[0007] The beneficial effect is: the light extraction layer of the present application is arranged on the side of the light-emitting layer away from the substrate, the light extraction layer includes a first light extraction layer located in the via area and a second light extraction layer located in the main screen area, the first light extraction layer includes a plurality of first light extraction sub-layers arranged in a stacked manner, that is, the first light extraction layer adopts a multi-layer structure, and the refractive indices of two adjacent first light extraction sub-layers are different, which can improve the light extraction efficiency of the first light extraction layer, and at the same time, the first light extraction sub-layer farthest from the substrate is arranged in a lens structure, which can further improve the light extraction efficiency of the first light extraction layer. Therefore, on the basis of unchanged light extraction efficiency, the thickness of the first light extraction layer can be reduced, thereby improving the transmittance of the first light extraction layer. Therefore, the display panel provided by the present application can improve the transmittance of the via area. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0009] Figure 1 is a schematic structural diagram of a first embodiment of a display panel of the present application;

[0010] Figure 2 is a schematic structural diagram of an implementation mode of a second embodiment of a display panel of the present application;

[0011] Figure 3 This application Figure 2 A schematic structural diagram of another embodiment of a display panel;

[0012] Figure 4 is a schematic structural diagram of an implementation manner of a third embodiment of the display panel of the present application;

[0013] Figure 5 This application Figure 4 A schematic structural diagram of an embodiment of the first light extraction layer;

[0014] Figure 6 This application Figure 4 A schematic structural diagram of another embodiment of the first light extraction layer;

[0015] Figure 7 This application Figure 4 A schematic structural diagram of another embodiment of a display panel;

[0016] Figure 8 is a schematic structural diagram of a fourth embodiment of a display panel of the present application;

[0017] Fig. 9 is a schematic structural diagram of a fifth embodiment of a display panel of the present application;

[0018] Fig.10 It is a schematic structural diagram of an embodiment of a display device of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that the terms "first" and "second" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0021] See also Figure 1 , Figure 1 It is a schematic structural diagram of the first embodiment of the display panel of the present application.

[0022] The display panel 100 includes a display area AA and a non-display area NA. The display area AA includes a via area A1 and a main screen area A2 disposed outside the via area A1. Specifically, the display area AA is used to display images and is usually provided with structures such as a driving circuit. The non-display area NA does not emit light and is usually provided with structures such as peripheral circuits. It can also be used to bond a driving chip or a circuit board (such as a flexible circuit board FPC). In the display area AA, the via area A1 needs to allow external light to pass through, so that devices such as cameras, light sensors, and receivers can be placed in the via area A1.

[0023] See also Figure 2 , Figure 2 It is a structural schematic diagram of the second embodiment of the display panel of the present application. Figure 2 Can be Figure 1 The cross-sectional view of the display area AA may be, for example, Figure 1 A cross-sectional view of the middle display area AA along the axis (B1-B2) between the via area A1 and the main screen area A2.

[0024] The display panel 100 includes a substrate 110, a light emitting layer 120 and a light extraction layer 130. The substrate 110, the light emitting layer 120 and the light extraction layer 130 may be partially located in the via area A1 and partially located in the main screen area A2, that is, the substrate 110, the light emitting layer 120 and the light extraction layer 130 are disposed in both the via area A1 and the main screen area A2.

[0025] The substrate 110 plays a supporting role in the display panel 100, wherein the substrate 110 may be flexible, and thus may be stretchable, foldable, bendable or rollable, thereby making the display panel 100 stretchable, foldable, bendable or rollable. The substrate 110 may be a single-layer structure or a laminated structure. In an application scenario, the substrate 110 may include at least one organic layer and at least one inorganic layer stacked in layers. The material of the organic layer may be a flexible material such as polyimide (PI), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyarylate (PAR) or glass fiber reinforced plastic (FRP), and the material of the inorganic layer may be a material such as silicon nitride that has good water vapor barrier properties. Of course, the substrate 110 may also be a rigid substrate, for example, its material is glass or metal. The substrate 110 may be transparent, translucent or opaque. In summary, the present application does not limit the specific structure of the substrate 110 .

[0026] The light-emitting layer 120 is disposed on one side of the substrate 110. The light-emitting layer 120 includes a light-emitting element. The light-emitting element includes a first electrode 121, a light-emitting material layer 122, and a second electrode 123 disposed in sequence in the light-emitting layer 120 in a direction away from the substrate 110. One of the first electrode 121 and the second electrode 123 is an anode, and the other is a cathode. For example, the first electrode 121 is an anode, and the second electrode 123 is a cathode for illustration. There are multiple light-emitting elements, some of which emit red light, some emit green light, and some emit blue light. This application does not limit the specific structure of the light-emitting element.

[0027] The light extraction layer 130 (Capping Layer, CPL) is disposed on the side of the light emitting layer 120 away from the substrate 110. For example, the light extraction layer 130 can be disposed on the side of the second electrode 123 of the light emitting layer 120 away from the substrate 110. The light extraction layer 130 can be used to adjust the optical interference distance, suppress external light reflection, and suppress extinction caused by surface plasma, thereby improving the light extraction efficiency and light transmittance.

[0028] Combined with reference Figure 3 The display panel 100 further includes a pixel circuit layer 140 and a pixel definition layer 150. The pixel circuit layer 140 and the pixel definition layer 150 may be partially located in the via area A1 and partially located in the main screen area A2.

[0029] The pixel circuit layer 140 is disposed on one side of the substrate 110, between the pixel definition layer 150 and the substrate 110, and is used to drive the light-emitting layer 120 to emit light. The pixel circuit layer 140 may be an array substrate, such as a thin film transistor substrate. The pixel circuit layer 140 may include a plurality of thin film transistors 141 (Thin Film Transistor, TFT). The periphery of the thin film transistor, that is, the non-display area NA, is also provided with a thin film transistor peripheral wiring.

[0030] The thin film transistor may include a gate, a source, a drain, and an active layer. A gate insulating layer may be arranged between the active layer and the gate, an interlayer insulating layer may be arranged between the gate and the source and the drain, a passivation layer may be arranged on the side of the source and the drain away from the gate, and a planarization layer may be arranged on the side of the passivation layer away from the source and the drain, wherein the planarization layer may be an organic layer such as acrylic, polyimide or benzocyclopentene.

[0031] The pixel definition layer 150 is disposed on a side of the substrate 110 away from the pixel circuit layer 140, and the pixel definition layer 150 is provided with a plurality of pixel openings (not shown), and a light-emitting element is disposed in each pixel opening. Specifically, the pixel definition layer 150 may be formed of an organic material such as polyimide (PI), polyamide, benzocyclobutene (BCB), acrylic resin or phenolic resin, or of an inorganic material such as silicon nitride. In one embodiment, the material of the pixel definition layer 150 includes a light-absorbing material to absorb ambient light, reduce the reflectivity of the display panel 100, and avoid crosstalk between the light emitted by two adjacent light-emitting elements. The pixel definition layer defines a plurality of pixel openings; the pixel openings may be square, other rectangular or circular. The present application does not limit the specific structure of the pixel definition layer 150.

[0032] Continue reading Figure 3 The display panel 100 further includes an encapsulation layer 160. The encapsulation layer 160 covers the light extraction layer 130 and the pixel definition layer 150, and is used to prevent oxygen and external water vapor from entering the light extraction layer 130. It should be understood that the encapsulation layer 160 can reduce the penetration of moisture, oxygen and / or hydrogen into the pixel circuit layer 140, the light-emitting layer 120, etc. The encapsulation layer 160 can be set as required, and the present application does not limit the encapsulation layer 160.

[0033] Continue reading Figure 2 and Figure 3 In order to improve the transmittance of the via area A1, different structures can be set for the light extraction layer 130 in the via area A1 and the main screen area A2. For example, different structures with different levels, different refractive indices or different transmittances can be set. This application does not limit this.

[0034] Specifically, the light extraction layer 130 includes a first light extraction layer 131 located in the via area A1 and a second light extraction layer 132 located in the main screen area A2. Among them, the first light extraction layer 131 is a multi-layer structure, and the first light extraction layer 131 includes a plurality of first light extraction sublayers 1311 stacked, and the refractive indexes of the two adjacent first light extraction sublayers 1311 are different, and the first light extraction sublayer 1311 farthest from the substrate 110 is a lens structure. The second light extraction layer 132 can be a single-layer structure, or the second light extraction layer 132 can be a multi-layer structure, etc. The present application does not limit the specific structure of the second light extraction layer 132.

[0035] The number of layers of the multilayer structure may represent at least two layers, such as two layers, three layers, four layers, five layers, etc. The present application does not limit the number of layers of the multilayer structure.

[0036] Among them, the first light extraction sublayer 1311 farthest from the substrate 110 is provided in a lens structure. Specifically, the lens structure may refer to making the shape of the first light extraction sublayer 1311 into the shape of a lens structure. For example, the lens structure includes a plano-convex lens, a bi-convex lens, a plano-concave lens, a bi-concave lens, a meniscus lens, a spherical lens, etc. Taking the plano-convex lens as an example, the first light extraction sublayer 1311 farthest from the substrate 110 may be made into the shape of its plano-convex lens. The specific lens structure may be selected according to different light transmission conditions, refractive index, thickness, etc., and the present application does not limit the specific structure of the lens structure of the first light extraction sublayer 1311.

[0037] Among them, the first light extraction sublayer 1311 farthest from the substrate 110 has a different shape of a lens structure, and other aspects of the material, thickness, refractive index, etc. can refer to other first light extraction sublayers 1311. In this way, it is possible to set the refractive index of two adjacent first light extraction sublayers 1311 to be different, thereby improving the light extraction efficiency of the first light extraction layer 131, and at the same time, the first light extraction sublayer 1311 farthest from the substrate 110 is set to have a lens structure, which can further improve the light extraction efficiency.

[0038] In the above scheme, the light extraction layer 130 of the present application is arranged on the side of the light emitting layer 120 away from the substrate 110, and the light extraction layer 130 includes a first light extraction layer 131 located in the via area A1 and a second light extraction layer 132 located in the main screen area A2. The first light extraction layer 131 includes a plurality of first light extraction sub-layers 1311 arranged in a stacked manner, that is, the first light extraction layer 131 adopts a multi-layer structure, and the refractive indexes of the two adjacent first light extraction sub-layers 1311 are different, which can improve the light extraction efficiency of the first light extraction layer 131. At the same time, the first light extraction sub-layer 1311 farthest from the substrate 110 is arranged in a lens structure, which can further improve the light extraction efficiency of the first light extraction layer 131. Therefore, on the basis of unchanged light extraction efficiency, the thickness of the first light extraction layer 131 can be reduced, thereby improving the transmittance of the first light extraction layer 131. Therefore, the display panel 100 provided in the present application can improve the transmittance of the via area A1.

[0039] See also Figure 4 , Figure 4 It is a schematic structural diagram of the third embodiment of the display panel of the present application.

[0040] Different from the above-mentioned embodiment, in this embodiment, the light extraction layer 130 of the display panel 100 includes a first light extraction layer 131 located in the via area A1 and a second light extraction layer 132 located in the main screen area A2. The first light extraction layer 131 is a multi-layer structure, and the second light extraction layer 132 is a single-layer structure. The single-layer structure can represent a light extraction layer composed of a single second light extraction sublayer or multiple identical second light extraction sublayers. Among them, the first light extraction layer 131 includes a plurality of first light extraction sublayers 1311 stacked, and the refractive indexes of two adjacent first light extraction sublayers 1311 are different, and the first light extraction sublayer 1311 farthest from the substrate 110 is a lens structure.

[0041] In some embodiments, the light extraction efficiency of the first light extraction layer 131 can be set to be equal to the light extraction efficiency of the second light extraction layer 132. Since the refractive indices of the two adjacent first light extraction sub-layers 1311 in the first light extraction layer 131 are different and the first light extraction sub-layer 1311 farthest from the substrate 110 is in a lens structure, under the premise of the same light extraction efficiency, the thickness of the first light extraction layer 131 will be smaller than the thickness of the second light extraction layer 132. Therefore, since the thickness of the first light extraction layer 131 is smaller, the transmittance of the first light extraction layer 131 can be greater than the transmittance of the second light extraction layer 132, thereby improving the transmittance of the first light extraction layer 131.

[0042] In some embodiments, the refractive index of the second light extraction layer 132 can be set to a range of 2.0 to 2.4, and / or the thickness of the second light extraction layer 132 can be set to a range of 500 to 900A (angstroms), and / or the transmittance of the second light extraction layer 132 can be set to a range of 60 to 80%. Among them, the specific refractive index, thickness, etc. of the second light extraction layer 132 can be selected according to the light extraction efficiency, transmittance, etc., and the present application does not limit the specific structure of the second light extraction layer 132. Exemplarily, the refractive index of the second light extraction layer 132 can be set to a range of 2.0 to 2.4, the thickness of the second light extraction layer 132 can be set to 800A, and the transmittance of the second light extraction layer 132 can be set to 70%.

[0043] In some embodiments, since the first light extraction layer 131 is a multi-layer structure, and the refractive indexes of two adjacent first light extraction sub-layers 1311 are different, the multi-layer first light extraction sub-layers 1311 may include at least two first light extraction sub-layers 1311 with different refractive indices. This embodiment is described by taking the first light extraction sub-layers 1311 including two different refractive indices as an example.

[0044] See also Figures 5 and 6 For the first light extraction layer 131, its multilayer first light extraction sublayer 1311 may include a first refractive index sublayer 11 and a second refractive index sublayer 12 that are adjacently arranged, wherein the first refractive index sublayer 11 and the second refractive index sublayer 12 have different refractive indices. Specifically, the refractive index of the first refractive index sublayer 11 is in the range of 1.3 to 1.6, for example, the refractive index is 1.3, 1.4 or 1.6. The refractive index of the second refractive index sublayer is in the range of 1.8 to 2.4, for example, the refractive index is 1.8, 2.0 or 2.4. This application does not limit the specific refractive index of the first refractive index sublayer 11 and the first refractive index sublayer 11.

[0045] In some embodiments, the thickness of the first refractive index sublayer 11 and the second refractive index sublayer 12 may be set respectively. The thickness of the first refractive index sublayer 11 is set to be in the range of 50 to 300 Å. For example, the thickness of the first refractive index sublayer 11 is 50 Å, 100 Å, or 200 Å.

[0046] In some embodiments, the thickness of the second refractive index sublayer 12 is set to be in the range of 50 to 700 Å. For example, the thickness of the second refractive index sublayer 12 is 100 Å, 200 Å, 500 Å, or 600 Å.

[0047] The first refractive index sublayer 11 and the second refractive index sublayer 12 may be made of the same or different materials. And / or, in the case of including a plurality of first refractive index sublayers 11, different layers of first refractive index sublayers 11 may be made of the same or different materials. And / or, in the case of including a plurality of second refractive index sublayers 12, different layers of second refractive index sublayers 12 may be made of the same or different materials.

[0048] In the above scheme, the first light extraction layer 131 is set to a multi-layer structure, and the second light extraction layer 132 is set to a single-layer structure. The refractive indexes of the two adjacent first light extraction sub-layers 1311 of the first light extraction layer 131 are different, which can improve the light extraction efficiency of the first light extraction layer 131. At the same time, the first light extraction sub-layer 1311 farthest from the substrate 110 is set to have a lens structure. At the same time, the first light extraction sub-layer 1311 farthest from the substrate 110 is set to have a lens structure, which can further improve the light extraction efficiency of the first light extraction layer 131. In addition, on the basis of unchanged light extraction efficiency, the thickness of the first light extraction layer 131 is less than the thickness of the second light extraction layer 132, which can reduce the thickness of the first light extraction layer 131, thereby improving the transmittance of the first light extraction layer 131. The display panel 100 provided in the present application can improve the transmittance of the via area A1.

[0049] In some embodiments, see Figure 7 , taking the first light extraction layer 131 as a three-layer structure as an example. The first light extraction layer 131 includes three stacked first light extraction sublayers 1311, and among the three first light extraction sublayers 1311, the refractive index of the first light extraction sublayer 1311 at the middle position is within the first range, and the refractive indexes of the other two first light extraction sublayers 1311 are within the second range. There is no intersection between the first range and the second range. In this way, the refractive indexes of adjacent first light extraction sublayers 1311 are different, which can improve the light extraction efficiency of the first light extraction layer 131. Among them, one of the first range and the second range is 1.3 to 1.6, and the other is 1.8 to 2.4. When the refractive index of the first light extraction sublayer 1311 at the middle position is in the first range, its thickness range is 50 to 300A. When the refractive index of the first light extraction sublayer 1311 at the middle position is in the second range, its thickness range is 50 to 700A.

[0050] In order to reduce the types of materials used in the preparation process and reduce production costs, the materials of the two first light extraction sublayers 1311 whose refractive indices are both within the second range are the same. Of course, in other embodiments, the materials of the two first light extraction sublayers 1311 whose refractive indices are both within the second range may also be different, and can be selected according to specific needs, which is not limited here.

[0051] Among them, the three-layer first light extraction sublayer 1311 may include a first refractive index sublayer 11 and a second refractive index sublayer 12 arranged adjacently, wherein the refractive index of the first refractive index sublayer 11 is different from that of the second refractive index sublayer 12. The first light extraction sublayer 1311 in the middle position may be any one of the first refractive index sublayer 11 and the second refractive index sublayer 12. The refractive index range of the first refractive index sublayer 11 is 1.3 to 1.6, and the refractive index range of the second refractive index sublayer 12 is 1.8 to 2.4. The thickness range of the first refractive index sublayer 11 is set to 50 to 300A. The thickness range of the second refractive index sublayer 12 is set to 50 to 700A.

[0052] In some embodiments, among the three first light extraction sublayers 1311, the first light extraction sublayer 1311 in the middle has the largest refractive index. Its refractive index ranges from 1.8 to 2.4, and its thickness ranges from 50 to 700A. Exemplarily, taking the first refractive index sublayer 11 and the second refractive index sublayer 12 as an example, the first light extraction sublayer 1311 in the middle is the second refractive index sublayer 12, and the other two first light extraction sublayers 1311 are the first refractive index sublayer 11, so that its three-layer structure can be expressed as an LHL structure.

[0053] In the direction away from the substrate 110 , the thicknesses of the three first light extraction sublayers 1311 are 100A, 500A and 100A respectively.

[0054] In some embodiments, among the three first light extraction sublayers 1311, the first light extraction sublayer 1311 in the middle has the smallest refractive index. Its refractive index ranges from 1.3 to 1.6, and its thickness ranges from 50 to 300A. Exemplarily, taking the first refractive index sublayer 11 and the second refractive index sublayer 12 as an example, the first light extraction sublayer 1311 in the middle is the first refractive index sublayer 11, and the other two first light extraction sublayers 1311 are the second refractive index sublayers 12, so that its three-layer structure can be expressed as an HLH structure.

[0055] In the direction away from the substrate 110 , the thicknesses of the three first light extraction sublayers 1311 are 50A, 100A and 600A respectively.

[0056] In the above scheme, the second light extraction layer 132 is set to adopt a multi-layer structure, the refractive index of the first light extraction sublayer 1311 in the middle position is within the first range, and the refractive indexes of the other two layers of the first light extraction sublayers 1311 are within the second range, so that the refractive indices of the first light extraction sublayers 1311 in the two adjacent layers are different, which can improve the light extraction efficiency of the first light extraction layer 131; in addition, the refractive index of the first light extraction sublayer 1311 in the middle position is set to be the minimum or maximum, which can improve the light extraction efficiency of the first light extraction layer 131, reduce the types of materials used in the preparation process, reduce production costs, and improve the transmittance of the light extraction layer 130 as a whole, which can improve the transmittance of the via area A1 of the display panel 100.

[0057] See also Figure 8 , Figure 8 It is a structural schematic diagram of the fourth embodiment of the display panel of the present application.

[0058] Different from the above-mentioned embodiment, in this embodiment, the light extraction layer 130 of the display panel 100 includes a first light extraction layer 131 located in the via area A1 and a second light extraction layer 132 located in the main screen area A2. The first light extraction layer 131 is a multi-layer structure, and the second light extraction layer 132 is a multi-layer structure. Among them, the first light extraction layer 131 includes a plurality of first light extraction sublayers 1311 stacked, and the refractive indexes of the two adjacent first light extraction sublayers 1311 are different, and the first light extraction sublayer 1311 farthest from the substrate 110 is a lens structure. The second light extraction layer 132 includes a plurality of second light extraction sublayers 1321 stacked.

[0059] In order to improve the transmittance of the first light extraction layer 131, a plurality of first light extraction sublayers 1311 including a first target light extraction sublayer 1312 and a plurality of second light extraction sublayers 1321 including a second target light extraction sublayer 1322 may be provided, the first target light extraction sublayer 1312 and the second target light extraction sublayer 1322 are provided on the same layer, and the transmittance of the first target light extraction sublayer 1312 is greater than the transmittance of the second target light extraction sublayer 1322. In this way, the transmittance of at least one first light extraction sublayer 1311 may be greater than the transmittance of the second light extraction sublayer 1321 provided on the same layer, that is, on the whole, the transmittance of the first light extraction layer 131 is greater than the transmittance of the second light extraction layer 132, thereby improving the transmittance of the via area A1 of the display panel 100.

[0060] In some embodiments, the thickness of the first light extraction layer 131 and the second light extraction layer 132 may be equal, or the thickness of the first light extraction layer 131 may be less than the thickness of the second light extraction layer 132, and the present application does not impose any restrictions on this. For ease of explanation, this embodiment is described by taking the case where the thickness of the first light extraction layer 131 and the second light extraction layer 132 are equal as an example. In the case where the thickness of the first light extraction layer 131 and the second light extraction layer 132 are equal, since the transmittance of the first target light extraction sublayer 1312 is greater than the transmittance of the second target light extraction sublayer 1322, the transmittance of the first light extraction layer 131 may be greater than the transmittance of the second light extraction layer 132 as a whole.

[0061] In some embodiments, the refractive indices of two adjacent second light extraction sub-layers 1321 are different, thereby improving the light extraction efficiency of the second light extraction layer 132 .

[0062] In some embodiments, the structure of the second light extraction layer 132 can refer to the structure of the first light extraction layer 131. Specifically, the multiple first light extraction sublayers 1311 in the first light extraction layer 131 and the multiple second light extraction sublayers 1321 in the second light extraction layer 132 are arranged one by one, and the first light extraction sublayer 1311 and the corresponding second light extraction sublayer 1321 are arranged in the same layer, wherein, except for the first target light extraction sublayer 1312, the transmittance of the other first light extraction sublayers 1311 are equal to the transmittance of the corresponding second light extraction sublayer 1321. That is, except for the first target light extraction layer 130 and the second target light extraction layer 130, the other second light extraction sublayers 1321 can refer to the specific structure of the first light extraction sublayer 1311 arranged in the same layer, so that the transmittance of the first light extraction layer 131 can be greater than the transmittance of the second light extraction layer 132 by changing the transmittance of the first target light extraction layer 130 and the second target light extraction layer 130.

[0063] In some embodiments, the refractive index of the first target light extraction sublayer 1312 is smaller than the refractive index of the adjacent first light extraction sublayer 1311, and the refractive index of the second target light extraction sublayer 1322 is smaller than the refractive index of the adjacent second light extraction sublayer 1321. That is, the first target light extraction layer 130 is the one with the smaller refractive index of the two adjacent first light extraction sublayers 1311, and the second target light extraction layer 130 is the one with the smaller refractive index of the two adjacent second light extraction sublayers 1321.

[0064] Exemplarily, the multilayer first light extraction sublayer 1311 includes a first refractive index sublayer and a second refractive index sublayer that are adjacently arranged. In order to further improve the light extraction efficiency of the first light extraction layer 131, the first refractive index sublayer can be used as the first target light extraction sublayer 1312 so that the transmittance of the first target light extraction sublayer 1312 is greater than the transmittance of the second target light extraction sublayer 1322.

[0065] In other application scenarios, the one with a larger refractive index of two adjacent first light extraction sublayers 1311 can also be set as the first target light extraction layer 130. That is, the refractive index of the first target light extraction sublayer 1312 is greater than the refractive index of the adjacent first light extraction sublayer 1311, and the refractive index of the second target light extraction sublayer 1322 is greater than the refractive index of the adjacent second light extraction sublayer 1321. In other application scenarios, two adjacent first light extraction sublayers 1311 can be set as the first target light extraction layer 130. In other application scenarios, the first light extraction sublayer 1311 farthest from the substrate 110 can be set as the first target light extraction sublayer 1312, and so on. This application does not impose any restrictions on this.

[0066] Exemplarily, the multilayer first light extraction sublayer 1311 includes a first refractive index sublayer and a second refractive index sublayer that are adjacently arranged. In order to further improve the light extraction efficiency of the first light extraction layer 131, the second refractive index sublayer can be used as the first target light extraction sublayer 1312, or both the first refractive index sublayer and the second refractive index sublayer can be used as the first target light extraction sublayer 1312, so that the transmittance of the first target light extraction sublayer 1312 is greater than the transmittance of the second target light extraction sublayer 1322.

[0067] In some embodiments, in order to make the transmittance of the first target light extraction sublayer 1312 greater than the transmittance of the second target light extraction sublayer 1322, a material with higher transmittance can be used to make the first target light extraction sublayer 1312. The material of the first target light extraction sublayer 1312 includes at least one of lithium fluoride (LiF), silicon oxynitride (SiOxN), and silicon oxynitride (SiONx), so that the transmittance of the first target light extraction layer 130 can be improved. The material can be selected according to specific needs, and the present application does not limit this.

[0068] In the above scheme, the first light extraction layer 131 and the second light extraction layer 132 both adopt a multi-layer structure, so that the light extraction efficiency of the light extraction layer 130 can be improved, and the transmittance of the light extraction layer 130 can be improved as a whole. By setting the transmittance of the first target light extraction sublayer 1312 to be greater than the transmittance of the second target light extraction sublayer 1322, the transmittance of the first light extraction layer 131 can be improved. Therefore, the transmittance of the via area A1 of the display panel 100 can be improved.

[0069] See also Fig. 9 , Fig. 9 It is a schematic structural diagram of the fifth embodiment of the display panel of the present application.

[0070] Different from the above-mentioned embodiment, in this embodiment, the first light extraction layer 131 and the second light extraction layer 132 are both three-layer structures for explanation. The first light extraction layer 131 includes three stacked first light extraction sublayers 1311, and among the three first light extraction sublayers 1311, the refractive index of the first light extraction sublayer 1311 at the middle position is the largest. The three-layer structure of the first light extraction layer 131 can be expressed as an LHL structure. The second light extraction layer 132 includes three stacked second light extraction sublayers 1321, and among the three second light extraction sublayers 1321, the refractive index of the second light extraction sublayer 1321 at the middle position is the largest. The three-layer structure of the second light extraction layer 132 can be expressed as an LHL structure.

[0071] Among them, the first light extraction sublayer 1311 farthest from the substrate 110 is the first target light extraction sublayer 1312. Correspondingly, the second light extraction sublayer 1321 farthest from the substrate 110 is the second target light extraction sublayer 1322. That is, the material of the first light extraction sublayer 1311 farthest from the substrate 110 can be set to include at least one of lithium fluoride (LiF), silicon oxynitride (SiOxN), and silicon oxynitride (SiONx). In this way, the transmittance of the first light extraction sublayer 1311 farthest from the substrate 110 is greater than the transmittance of the second light extraction sublayer 1321 farthest from the substrate 110 in the second light extraction layer 132, so that the transmittance of the first light extraction layer 131 is greater than the transmittance of the second light extraction layer 132, thereby improving the transmittance of the first light extraction layer 131.

[0072] In some embodiments, the transmittance of the second light extraction layer 132 is 80%, and the transmittance of the first light extraction layer 131 is in the range of 83-87%. Among them, the multilayer first light extraction sublayer 1311 includes a first refractive index sublayer and a second refractive index sublayer arranged adjacent to each other, the refractive index of the first refractive index sublayer is in the range of 1.3 to 1.6, and the refractive index of the second refractive index sublayer is in the range of 1.8 to 2.4. The thickness of the first refractive index sublayer is in the range of 50 to 300A. The thickness of the second refractive index sublayer is in the range of 50 to 700A. The refractive index of the first light extraction sublayer 1311 in the middle position is in the range of 1.8 to 2.4, that is, it can be the second refractive index sublayer, and the refractive index of the other two layers of the first light extraction sublayer 1311 is in the range of 1.3 to 1.6, that is, it is the first refractive index sublayer.

[0073] In the above scheme, the light extraction efficiency of the light extraction layer 130 can be improved by using a multi-layer structure for both the first light extraction layer 131 and the second light extraction layer 132, and the first light extraction sublayer 1311 farthest from the substrate 110 is a lens structure, which can further improve the light extraction efficiency of the first light extraction layer 131 and improve the transmittance of the first light extraction layer 131. In addition, the first light extraction sublayer 1311 farthest from the substrate 110 is set as the first target light extraction sublayer 1312, whose transmittance is greater than the second target light extraction sublayer 1322, further improving the transmittance of the first light extraction layer 131. Thus, the transmittance of the via area A1 of the display panel 100 can be improved.

[0074] It is understandable that the above-mentioned embodiments can be combined or implemented in combination with each other under the condition of no obstacles, and the present application does not limit this.

[0075] It should also be noted that the display panel 100 of the present application can be an OLED (Organic Light-Emitting Diode) display panel, and the display panel 100 can also be an LCD display panel (Liquid Crystal Display), a Mirco-LED display panel (Micro Light Emitting Diode) or other types of display panels. The present application does not limit the specific type of the display panel 100.

[0076] In addition, the present application also includes a display device, see Fig.10 , Fig.10 : is a schematic diagram of the structure of an embodiment of the display device of the present application. The display device 200 includes the display panel 100 in any of the above-mentioned embodiments. The specific structure and function of the display panel 100 can be found in the above-mentioned related descriptions, which will not be repeated here. Among them, the display device can be a product or component with a display function such as a mobile phone, a tablet computer, a laptop computer and a television. The display device also includes a mainboard, a control circuit, etc. These structures are the same or similar to the relevant structures of the existing display devices. For details, please refer to the prior art and will not be repeated here. The present application does not limit the display device.

[0077] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: The display panel includes a via hole area and a main screen area located outside the via hole area, and the display panel also includes: substrate; The light extraction layer is arranged on the side of the light emitting layer away from the substrate, and includes a first light extraction layer located in the via area and a second light extraction layer located in the main screen area, wherein the first light extraction layer includes a plurality of first light extraction sublayers stacked together, and the refractive indices of two adjacent first light extraction sublayers are different, and the first light extraction sublayer farthest from the substrate is in a lens structure.

2. The display panel according to claim 1, characterized in that: The second light extraction layer is a single-layer structure; Preferably, the light extraction efficiency of the first light extraction layer is equal to the light extraction efficiency of the second light extraction layer, and the thickness of the first light extraction layer is smaller than the thickness of the second light extraction layer; Preferably, the refractive index of the second light extraction layer is in the range of 2.0 to 2.4, and / or the thickness of the second light extraction layer is in the range of 500 to 900A, and / or the transmittance of the second light extraction layer is in the range of 60 to 80%.

3. The display panel according to claim 1, characterized in that: The second light extraction layer includes a plurality of second light extraction sublayers stacked together, wherein the plurality of first light extraction sublayers include a first target light extraction sublayer, the plurality of second light extraction sublayers include a second target light extraction sublayer, the first target light extraction sublayer and the second target light extraction sublayer are arranged in the same layer, and the transmittance of the first target light extraction sublayer is greater than the transmittance of the second target light extraction sublayer; Preferably, the refractive indexes of two adjacent layers of the second light extraction sub-layers are different; Preferably, the thickness of the first light extraction layer is equal to that of the second light extraction layer; Preferably, the multiple layers of the first light extraction sublayers in the first light extraction layer and the multiple layers of the second light extraction sublayers in the second light extraction layer are arranged in a one-to-one correspondence, and the first light extraction sublayer and the corresponding second light extraction sublayer are arranged in the same layer, wherein, except for the first target light extraction sublayer, the transmittances of other first light extraction sublayers are equal to the transmittances of their respective corresponding second light extraction sublayers.

4. The display panel according to claim 3, characterized in that: The refractive index of the first target light extraction sublayer is smaller than the refractive index of the adjacent first light extraction sublayer, and the refractive index of the second target light extraction sublayer is smaller than the refractive index of the adjacent second light extraction sublayer; Preferably, the material of the first target light extraction sublayer includes at least one of lithium fluoride, silicon oxynitride, and silicon oxynitride compounds.

5. The display panel according to claim 4, characterized in that: The first light extraction layer includes three stacked first light extraction sublayers, and among the three first light extraction sublayers, the first light extraction sublayer at the middle position has the largest refractive index; the second light extraction layer includes three stacked second light extraction sublayers, and among the three second light extraction sublayers, the second light extraction sublayer at the middle position has the largest refractive index, wherein the first light extraction sublayer farthest from the substrate is the first target light extraction sublayer; Preferably, the transmittance of the second light extraction layer is 80%, and the transmittance of the first light extraction layer is in the range of 83-87%.

6. The display panel according to claim 1, characterized in that: The multilayer first light extraction sublayer includes a first refractive index sublayer and a second refractive index sublayer that are adjacently arranged, wherein the refractive index of the first refractive index sublayer is in the range of 1.3 to 1.6, and the refractive index of the second refractive index sublayer is in the range of 1.8 to 2.4; Preferably, the thickness of the first refractive index sublayer ranges from 50 to 300 Å; Preferably, the thickness of the second refractive index sublayer is in the range of 50 to 700 Å.

7. The display panel according to claim 1, characterized in that: The first light extraction layer includes three stacked first light extraction sublayers, and among the three first light extraction sublayers, the refractive index of the first light extraction sublayer at the middle position is within a first range, and the refractive indexes of the other two first light extraction sublayers are within a second range, and the first range and the second range do not have an intersection; Preferably, the two first light extraction sub-layers whose refractive indexes are both within the second range are made of the same material.

8. The display panel according to claim 7, characterized in that: Among the three first light extraction sublayers, the first light extraction sublayer at the middle position has the largest refractive index; Preferably, in the direction away from the substrate, the thicknesses of the three first light extraction sub-layers are 100A, 500A and 100A respectively.

9. The display panel according to claim 7, characterized in that: Among the three first light extraction sublayers, the first light extraction sublayer at the middle position has the smallest refractive index; Preferably, in the direction away from the substrate, the thicknesses of the three first light extraction sub-layers are 50A, 100A and 600A respectively.

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

Images