Display panel and display device

Abstract

The invention provides a display panel and a display device. The display panel comprises a substrate; the display function layer is arranged on one side of the substrate; the light extraction layer is located on the side, away from the substrate, of the display function layer, and the light extraction layer comprises a first light extraction layer, a second light extraction layer and a third light extraction layer which are sequentially arranged in a stacked mode in the direction away from the substrate; the refractive index of the second light extraction layer is larger than the refractive index of the first light extraction layer and the refractive index of the third light extraction layer. According to the display panel provided by the invention, the refractive index of the second light extraction layer is relatively high so as to improve the microcavity effect and improve the light extraction efficiency, and the refractive index of the first light extraction layer and the third light extraction layer is relatively low so as to reduce the refractive index difference with other film layers, so that the total reflection phenomenon caused by mismatching of the refractive indexes is avoided; the light extraction efficiency and the power consumption benefit can be improved, so that the performance of the display panel is improved.

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] OLED (Organic Light-Emitting Diode) is an active light-emitting device with a sandwich structure consisting of multiple organic layers and electrodes on both sides. At present, display screens based on AMOLED (Active-Matrix Organic Light-Emitting Diode) have been commercialized in the fields of smart phones, watches and laptops.

[0003] However, existing display screens have the problem of low light extraction efficiency. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a display panel that is beneficial to improving light extraction efficiency and power consumption benefits.

[0005] Based on the above purpose, the present application provides a display panel, which includes:

[0006] substrate;

[0007] A display function layer is disposed on one side of the substrate;

[0008] A light extraction layer, located on a side of the display function layer away from the substrate, the light extraction layer comprising a first light extraction layer, a second light extraction layer and a third light extraction layer sequentially stacked in a direction away from the substrate;

[0009] Among them, the refractive index of the second light extraction layer is greater than the refractive index of the first light extraction layer and the refractive index of the third light extraction layer.

[0010] In one embodiment, the refractive index of the second light extraction layer is greater than or equal to 1.5;

[0011] Preferably, the refractive index of the second light extraction layer is greater than or equal to 2 and less than or equal to 2.2;

[0012] Preferably, the refractive index of the first light extraction layer and the refractive index of the third light extraction layer are less than or equal to 1.5;

[0013] Preferably, the refractive index of the first light extraction layer and the refractive index of the third light extraction layer are less than or equal to 1.45;

[0014] Preferably, the refractive index of the first light extraction layer is equal to the refractive index of the third light extraction layer.

[0015] In one embodiment, the display panel further includes a buffer layer, and the buffer layer is disposed on a side of the light extraction layer away from the display function layer;

[0016] Preferably, the material of the buffer layer includes lithium fluoride or potassium fluoride;

[0017] Preferably, the refractive index of the buffer layer is smaller than the refractive index of the third light extraction layer;

[0018] Preferably, the difference between the refractive index of the buffer layer and the refractive index of the third light extraction layer is less than or equal to 0.3;

[0019] Preferably, the difference between the refractive index of the buffer layer and the refractive index of the third light extraction layer is less than or equal to 0.15;

[0020] Preferably, the refractive index of the buffer layer is greater than or equal to 1.2 and less than or equal to 1.4;

[0021] Preferably, the refractive index of the buffer layer is equal to 1.3.

[0022] In one embodiment, the thickness of the light extraction layer is less than or equal to 90 nm;

[0023] Preferably, the thickness of the second light extraction layer is greater than the thickness of the first light extraction layer and the thickness of the third light extraction layer;

[0024] Preferably, the thickness of the first light extraction layer is equal to the thickness of the third light extraction layer;

[0025] Preferably, the thickness of the second light extraction layer is greater than or equal to 50 nm and less than or equal to 70 nm;

[0026] Preferably, the thickness of the first light extraction layer and the thickness of the third light extraction layer are greater than or equal to 10 nm and less than or equal to 20 nm;

[0027] Preferably, the thickness of the second light extraction layer is 60 nm, and the thickness of the first light extraction layer and the thickness of the third light extraction layer are 15 nm.

[0028] In one embodiment, the display function layer includes a plurality of light-emitting devices and a pixel definition layer, the pixel definition layer defines a plurality of pixel openings, the light-emitting devices are at least partially located within the corresponding pixel openings, and the light-emitting devices include a first electrode, a light-emitting function layer, and a second electrode which are sequentially stacked in a direction away from the substrate.

[0029] In one embodiment, the display panel further includes a filter layer, and the filter layer is arranged on a side of the display function layer away from the substrate;

[0030] Preferably, the luminescent functional layer comprises a red luminescent functional layer, a green luminescent functional layer and a blue luminescent functional layer; the filter layer comprises a red light filter, a blue light filter and a green light filter, the red light filter is arranged opposite to the red light luminescent functional layer, the green light filter is arranged opposite to the green light luminescent functional layer, and the blue light filter is arranged opposite to the blue light luminescent functional layer;

[0031] Preferably, the blue light filter has a transmittance of blue light greater than or equal to 65%;

[0032] Preferably, the blue light filter has a transmittance of blue light greater than or equal to 75%;

[0033] Preferably, the thickness of the blue light filter is less than or equal to 5 μm;

[0034] Preferably, the thickness of the blue light filter is 3 μm;

[0035] Preferably, the orthographic projection of the red light emitting functional layer on the substrate is located within the orthographic projection of the corresponding red light filter on the substrate;

[0036] Preferably, the orthographic projection of the green light emitting functional layer on the substrate is located within the orthographic projection of the corresponding green light filter on the substrate;

[0037] Preferably, the orthographic projection of the blue light emitting functional layer on the substrate is located within the orthographic projection of the corresponding blue light filter on the substrate.

[0038] In one embodiment, the display panel further includes a light shielding layer, the light shielding layer is arranged on a side of the light-emitting functional layer away from the substrate, the light shielding layer includes a plurality of light-transmitting openings, the plurality of light-transmitting openings include a red light-transmitting opening, a green light-transmitting opening, and a blue light-transmitting opening, the red light filter is at least partially located in the corresponding red light-transmitting opening, the green light filter is at least partially located in the corresponding green light-transmitting opening, and the blue light filter is at least partially located in the corresponding blue light-transmitting opening;

[0039] Preferably, the orthographic projection of the red light transparent opening on the substrate is located within the orthographic projection of the corresponding red light filter on the substrate;

[0040] Preferably, the orthographic projection of the green light transparent opening on the substrate is located within the orthographic projection of the corresponding green light filter on the substrate;

[0041] Preferably, the orthographic projection of the blue light transparent opening on the substrate is located within the orthographic projection of the corresponding blue light filter on the substrate;

[0042] Preferably, the display panel further comprises an optical adhesive layer, and the optical adhesive layer is arranged on a side of the filter layer and the light shielding layer away from the substrate;

[0043] Preferably, the display panel further comprises a cover plate, and the cover plate is arranged on a side of the optical adhesive layer away from the substrate.

[0044] In one embodiment, the orthographic projection of the red light emitting functional layer on the substrate is located within the orthographic projection of the corresponding red light transmitting opening on the substrate, the orthographic projection of the green light emitting functional layer on the substrate is located within the orthographic projection of the corresponding green light transmitting opening on the substrate, and the orthographic projection of the blue light emitting functional layer on the substrate is located within the orthographic projection of the corresponding blue light transmitting opening on the substrate;

[0045] Preferably, the edge of the orthographic projection of the red light emitting functional layer on the substrate has a first distance from the edge of the orthographic projection of the corresponding red light transmitting opening on the substrate, the edge of the orthographic projection of the green light emitting functional layer on the substrate has a second distance from the edge of the orthographic projection of the corresponding green light transmitting opening on the substrate, and the edge of the orthographic projection of the blue light emitting functional layer on the substrate has a third distance from the edge of the orthographic projection of the corresponding blue light transmitting opening on the substrate; wherein the third distance is smaller than the first distance and the second distance;

[0046] Preferably, the first distance is equal to the second distance;

[0047] Preferably, the first distance and the second distance are 5 μm, and the third distance is 4 μm.

[0048] In one embodiment, the display panel further comprises an encapsulation layer, and the encapsulation layer is disposed on a side of the light extraction layer away from the substrate;

[0049] Preferably, the display panel further comprises a touch layer, and the touch layer is arranged on a side of the encapsulation layer away from the substrate.

[0050] Based on the same inventive concept, the present application also discloses a display device, which includes any one of the display panels described above.

[0051] Compared with the prior art, the display panel provided by the present application has a light extraction layer including a first light extraction layer, a second light extraction layer and a third light extraction layer which are sequentially stacked in a direction away from the substrate, and the refractive index of the second light extraction layer is greater than the refractive index of the first light extraction layer and the refractive index of the third light extraction layer. Among them, the higher refractive index of the second light extraction layer is conducive to improving the microcavity effect and improving the light extraction efficiency, and the lower refractive index of the first light extraction layer and the third light extraction layer is conducive to reducing the refractive index difference with other film layers, avoiding the total reflection phenomenon caused by the mismatch of the refractive index, and is conducive to improving the light extraction efficiency and power consumption benefits, thereby improving the performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 A schematic diagram of the layer structure of a display panel provided in an embodiment of the present application;

[0054] Figure 2 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0055] Figure 3 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0056] Figure 4 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0057] Figure 5 A schematic projection diagram of a display panel provided in another embodiment of the present application;

[0058] Figure 6 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0059] Figure 7 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0060] Figure 8 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application.

[0061] Marking Description:

[0062] 100. Display panel;

[0063] 1. Substrate;

[0064] 2. Display function layer; 21. Pixel definition layer; 211. Pixel opening; 22. Light emitting device; 221. First electrode; 222. Light emitting function layer; 223. Second electrode;

[0065] 3. light extraction layer; 31. first light extraction layer; 32. second light extraction layer; 33. third light extraction layer;

[0066] 4. Buffer layer;

[0067] 5. Filter layer; 51. Filter;

[0068] 6. Shading layer; 61. Light-transmitting opening;

[0069] 7. Encapsulation layer;

[0070] 8. Touch layer;

[0071] 91. Optical adhesive layer; 92. Cover plate. DETAILED DESCRIPTION

[0072] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0073] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0074] OLED display panel is one of the hot spots in the current display panel research field. OLED display panel has the advantages of low energy consumption, low cost, self-luminescence, wide viewing angle and fast response speed. In order to improve light transmittance and reduce the thickness of the display panel, the current OLED display panel usually adopts PLP (Pol-Less Panel, without polarizer) technology. Common PLP technologies include: integrating color filter (Color Filter, CF) into the encapsulation layer (Color On Encapsulation, COE) technology. However, the display panel using COE technology has the problem of low light output efficiency.

[0075] Based on this, the present application provides a display panel solution to solve the above problems.

[0076] Please refer to Figure 1 As shown, a display panel 100 provided in an embodiment of the present application includes a substrate 1, a display function layer 2 and a light extraction layer 3. The display function layer 2 is arranged on one side of the substrate 1, and the light extraction layer 3 is located on the side of the display function layer 2 away from the substrate 1. The light extraction layer 3 includes a first light extraction layer 31, a second light extraction layer 32 and a third light extraction layer 33 which are sequentially stacked in a direction away from the substrate 1. The refractive index of the second light extraction layer 32 is greater than the refractive index of the first light extraction layer 31 and the refractive index of the third light extraction layer 33.

[0077] Among them, the higher refractive index of the second light extraction layer 32 is beneficial to improving the microcavity effect and the light extraction efficiency. The lower refractive index of the first light extraction layer 31 and the third light extraction layer 33 is beneficial to reducing the refractive index difference with other film layers and avoiding the total reflection phenomenon caused by refractive index mismatch, which is beneficial to improving the light extraction efficiency and power consumption benefits, thereby improving the performance of the display panel 100.

[0078] Among them, the microcavity effect can make the light emitted by the display function layer 2 reflect and interfere multiple times in the cavity, increasing the interaction between the light and the cavity wall, thereby improving the coupling efficiency of light from the display function layer 2 to the outside, and ultimately improving the light extraction efficiency of the display panel 100.

[0079] In one embodiment, the refractive index of the second light extraction layer 32 is greater than or equal to 1.5, which is conducive to improving the microcavity effect, thereby improving the light extraction efficiency. Exemplarily, the refractive index of the second light extraction layer 32 is 1.5, 1.6, 1.7, 1.8, 2, 3, 4, etc., and is not specifically limited.

[0080] Preferably, the refractive index of the second light extraction layer 32 is greater than or equal to 2 and less than or equal to 2.2, which is conducive to improving the microcavity effect and avoiding the excessive refractive index affecting the spectral characteristics and light output efficiency of the microcavity and reducing the performance and stability of the microcavity. Exemplarily, the refractive index of the second light extraction layer 32 is 2, 2.05, 2.1, 2.15, 2.2, etc.

[0081] Preferably, the refractive index of the first light extraction layer 31 and the refractive index of the third light extraction layer 33 are less than or equal to 1.5, which is beneficial to reduce the refractive index difference with other film layers and avoid the total reflection phenomenon caused by refractive index mismatch. Exemplarily, the refractive index of the first light extraction layer 31 and the refractive index of the third light extraction layer 33 are 1.5, 1.4, 1.3, etc.

[0082] Preferably, the refractive index of the first light extraction layer 31 and the refractive index of the third light extraction layer 33 are less than or equal to 1.45, further reducing the refractive index difference with other film layers. Exemplarily, the refractive index of the first light extraction layer 31 and the refractive index of the third light extraction layer 33 are 1.45, 1.35, etc.

[0083] Preferably, the refractive index of the first light extraction layer 31 is equal to the refractive index of the third light extraction layer 33, and the same material can be selected to facilitate preparation.

[0084] Reference Figure 2 As shown, in one embodiment, the display panel 100 further includes a buffer layer 4, which is disposed on a side of the light extraction layer 3 away from the display function layer 2. The buffer layer 4 can protect the light extraction layer 3, reduce reflection loss, and block the charges in the encapsulation layer from migrating to the light extraction layer 3. Preferably, the material of the buffer layer 4 includes lithium fluoride or potassium fluoride.

[0085] Preferably, the refractive index of the buffer layer 4 is smaller than that of the third light extraction layer 33 , thereby achieving refractive index matching.

[0086] Preferably, the difference between the refractive index of the buffer layer 4 and the refractive index of the third light extraction layer 33 is less than or equal to 0.3. Reducing the refractive index difference can avoid the total reflection phenomenon caused by refractive index mismatch. Exemplarily, the difference between the refractive index of the buffer layer 4 and the refractive index of the third light extraction layer 33 is 0.3, 0.2, 0.1, etc., and is not specifically limited.

[0087] Preferably, the difference between the refractive index of the buffer layer 4 and the refractive index of the third light extraction layer 33 is less than or equal to 0.15. For example, the difference between the refractive index of the buffer layer 4 and the refractive index of the third light extraction layer 33 is 0.15, 0.05, etc.

[0088] Preferably, the refractive index of the buffer layer 4 is greater than or equal to 1.2 and less than or equal to 1.4. It plays a role in the refractive index transition between the third light extraction layer 33 and the encapsulation layer to achieve refractive index matching. For example, the refractive index of the buffer layer 4 is 1.2, 1.3, 1.4, etc., which is not specifically limited.

[0089] In one embodiment, the thickness of the light extraction layer 3 is less than or equal to 90 nm, which is conducive to further improving the light extraction efficiency. Exemplarily, the thickness of the light extraction layer 3 is 60 nm, 70 nm, 80 nm, 90 nm, etc., and is not specifically limited.

[0090] Preferably, the thickness of the second light extraction layer 32 is greater than the thickness of the first light extraction layer 31 and the thickness of the third light extraction layer 33 , which is beneficial to ensure the microcavity effect.

[0091] Preferably, the thickness of the first light extraction layer 31 and the thickness of the third light extraction layer 33 are equal.

[0092] Preferably, the thickness of the second light extraction layer 32 is greater than or equal to 50 nm and less than or equal to 70 nm. Exemplarily, the thickness of the second light extraction layer 32 is 50 nm, 55 nm, 60 nm, 65 nm, 70 nm, etc.

[0093] Preferably, the thickness of the first light extraction layer 31 and the thickness of the third light extraction layer 33 are greater than or equal to 10 nm and less than or equal to 20 nm. Exemplarily, the thickness of the first light extraction layer 31 is 10 nm, 15 nm, 20 nm, etc., and the thickness of the third light extraction layer 33 is 10 nm, 15 nm, 20 nm, etc.

[0094] Preferably, the thickness of the second light extraction layer 32 is 60 nm, and the thickness of the first light extraction layer 31 and the thickness of the third light extraction layer 33 are 15 nm.

[0095] Reference Figure 3 As shown, in one embodiment, the display function layer 2 includes a plurality of light-emitting devices 22 and a pixel definition layer 21, the pixel definition layer 21 defines a plurality of pixel openings 211, the light-emitting devices 22 are at least partially located in the corresponding pixel openings 211, and the light-emitting devices 22 include a first electrode 221, a light-emitting function layer 222, and a second electrode 223 sequentially stacked in a direction away from the substrate 1. By applying a voltage to the first electrode 221 and the second electrode 223, the light-emitting function layer 222 emits light.

[0096] Optionally, the first electrode 221 is an anode, and the second electrode 223 is a cathode.

[0097] Among them, the anode can effectively introduce the current provided by the outside into the light-emitting device 22. The light-emitting functional layer 222 is the core part of the light-emitting device 22. This layer contains organic or inorganic materials that can generate light radiation under the action of an electric field. Different material combinations and structural designs can achieve light-emitting effects of different colors and brightness. The cathode is responsible for receiving electrons from the external circuit and injecting them into the light-emitting device 22. The cathode material generally has a lower work function to facilitate the injection of electrons.

[0098] Further, the light-emitting functional layer 222 may include a first common layer, a light-emitting layer, and a second common layer, which are sequentially stacked on the first electrode 221. The first common layer may include a hole injection layer, a hole transport layer, an electron blocking layer, etc. The second common layer may include an electron injection layer, an electron transport layer, a hole blocking layer, etc.

[0099] Reference Figure 4 As shown, in one embodiment, the display panel 100 further includes a filter layer 5, which is disposed on a side of the display function layer 2 away from the substrate 1. The filter layer 5 is beneficial to improving the color shift phenomenon of the display panel 100.

[0100] Preferably, the light-emitting functional layer 222 includes a red light-emitting functional layer, a green light-emitting functional layer and a blue light-emitting functional layer; the filter layer 5 includes a plurality of filters 51, the plurality of filters 51 include a red light filter, a blue light filter and a green light filter, the red light filter is arranged relative to the red light-emitting functional layer, the green light filter is arranged relative to the green light-emitting functional layer, and the blue light filter is arranged relative to the blue light-emitting functional layer. Different filters 51 correspond to different light-emitting functional layers 222, and the light output brightness attenuation rate of light-emitting devices 22 of different colors can be adjusted by adjusting the thickness of the red light filter, the blue light filter and the green light filter, so that the brightness attenuation rates of the light-emitting devices 22 of the three colors tend to be consistent, thereby improving the color shift phenomenon of the display panel 100.

[0101] Specifically, the red light filter is located directly above the red light emitting functional layer, and is used to transmit red light and filter out light of other colors; the blue light filter is located directly above the blue light emitting functional layer, and is used to transmit blue light and filter out light of other colors; the green light filter is located directly above the green light emitting functional layer, and is used to transmit green light and filter out light of other colors.

[0102] Preferably, the transmittance of the blue light filter to blue light is greater than or equal to 65%. Among them, a higher blue light transmittance is conducive to improving blue light efficiency and improving power consumption benefits. Exemplarily, the transmittance of the blue light filter to blue light is 65%, 68%, 70%, 73%, 80%, 90%, 95%, etc.

[0103] Preferably, the transmittance of the blue light filter to blue light is greater than or equal to 75%, for example, 76%, 78%, 80%, 82%, 90%, 95%, etc.

[0104] Preferably, the thickness of the blue light filter is less than or equal to 5 μm, for example, 5 μm, 4.5 μm, 4 μm, 3.5 μm, etc. Preferably, the thickness of the blue light filter is 3 μm.

[0105] Preferably, the orthographic projection of the red light emitting functional layer on the substrate 1 is located within the orthographic projection of the corresponding red light filter on the substrate 1 to ensure light extraction efficiency.

[0106] Preferably, the orthographic projection of the green light emitting functional layer on the substrate 1 is located within the orthographic projection of the corresponding green light filter on the substrate 1 to ensure light extraction efficiency.

[0107] Preferably, the orthographic projection of the blue light emitting functional layer on the substrate 1 is located within the orthographic projection of the corresponding blue light filter on the substrate 1 to ensure light extraction efficiency.

[0108] Please continue to refer to Figure 4 As shown, in one embodiment, the display panel 100 further includes a light shielding layer 6, which is disposed on a side of the light-emitting functional layer 222 away from the substrate 1, and includes a plurality of light-transmitting openings 61, the plurality of light-transmitting openings 61 including a red light-transmitting opening, a green light-transmitting opening, and a blue light-transmitting opening, a red light filter is at least partially located in the corresponding red light-transmitting opening, a green light filter is at least partially located in the corresponding green light-transmitting opening, and a blue light filter is at least partially located in the corresponding blue light-transmitting opening. The light shielding layer 6 is conducive to improving the crosstalk problem between adjacent light-emitting devices 22 and improving the display quality.

[0109] Preferably, the orthographic projection of the red light transparent opening on the substrate 1 is located within the orthographic projection of the corresponding red light filter on the substrate 1 .

[0110] Preferably, the orthographic projection of the green light transparent opening on the substrate 1 is located within the orthographic projection of the corresponding green light filter on the substrate 1 .

[0111] Preferably, the orthographic projection of the blue light transparent opening on the substrate 1 is located within the orthographic projection of the corresponding blue light filter on the substrate 1 .

[0112] In one embodiment, the orthographic projection of the red light emitting functional layer on the substrate 1 is located within the orthographic projection of the corresponding red light transparent opening on the substrate 1, the orthographic projection of the green light emitting functional layer on the substrate 1 is located within the orthographic projection of the corresponding green light transparent opening on the substrate 1, and the orthographic projection of the blue light emitting functional layer on the substrate 1 is located within the orthographic projection of the corresponding blue light transparent opening on the substrate 1. This is beneficial to improving the light extraction efficiency of each light emitting device 22.

[0113] Preferably, the edge of the orthographic projection of the red light emitting functional layer on the substrate 1 has a first distance from the edge of the orthographic projection of the corresponding red light transmitting opening on the substrate 1, the edge of the orthographic projection of the green light emitting functional layer on the substrate 1 has a second distance from the edge of the orthographic projection of the corresponding green light transmitting opening on the substrate 1, and the edge of the orthographic projection of the blue light emitting functional layer on the substrate 1 has a third distance from the edge of the orthographic projection of the corresponding blue light transmitting opening on the substrate 1; wherein the third distance is smaller than the first distance and the second distance.

[0114] Specifically, refer to Figure 4 and 5 As shown, the distance between the edge of the orthographic projection of the light-emitting functional layer 222 on the substrate 1 and the edge of the orthographic projection of the corresponding light-transmitting opening 61 on the substrate 1 is d. The shape of the orthographic projection of the light-emitting functional layer 222 on the substrate 1 can be circular, rectangular, hexagonal, etc., which is not specifically limited.

[0115] Among them, since the increase in blue light transmittance will lead to an increase in blue light output, which will bring about the problem of worsening color shift at a wide viewing angle, in this embodiment, the distance between the blue light transmission opening and the red light transmission opening and the green light transmission opening is reduced, thereby reducing the amount of blue light output and improving the problem of worsening color shift at a wide viewing angle.

[0116] Preferably, the first distance is equal to the second distance.

[0117] Preferably, the first distance and the second distance are 5 μm, and the third distance is 4 μm.

[0118] Please continue to refer to Figure 4 As shown, in one embodiment, the display panel 100 further includes an encapsulation layer 7, which is disposed on the side of the light extraction layer 3 away from the substrate 1, and the encapsulation layer 7 is used to protect the display function layer 2. Further, the encapsulation layer 7 includes a first encapsulation layer, a second encapsulation layer and a third encapsulation layer, the first encapsulation layer includes an inorganic layer, the inorganic layer has a high density to isolate water and oxygen, the second encapsulation layer includes an organic layer, so as to have a large thickness to flatten the surface of the display panel 100, and the third encapsulation layer includes an inorganic layer to achieve inorganic-organic-inorganic three-layer encapsulation. Further, the encapsulation layer 7 is disposed on the side of the filter layer 5 and the light shielding layer 6 close to the substrate 1.

[0119] Reference Figure 6 As shown, in one embodiment, the display panel 100 further includes a touch layer 8, which is disposed on a side of the encapsulation layer 7 away from the substrate 1, and is used to implement a touch function. Further, the touch layer 8 is disposed on a side of the filter layer 5 and the light shielding layer 6 close to the substrate 1.

[0120] Reference Figure 7As shown, in one embodiment, the display panel 100 further includes an optical adhesive layer 91 . The optical adhesive layer 91 is disposed on a side of the filter layer 5 and the light shielding layer 6 away from the substrate 1 . The optical adhesive layer 91 is used for bonding with other film layers.

[0121] Reference Figure 8 As shown, in one embodiment, the display panel 100 further includes a cover plate 92 . The cover plate 92 is disposed on a side of the optical adhesive layer 91 away from the substrate 1 , and is used to protect the display panel 100 .

[0122] Based on the same inventive concept, another embodiment of the present application further discloses a display device, which includes the display panel in the above embodiment. Further, the display device includes a mobile phone, VR equipment, computer, television, car display equipment, etc.

[0123] A display device provided in this embodiment has a display panel 100 in which a second light extraction layer 32 has a higher refractive index, which is beneficial to improving the microcavity effect and the light extraction efficiency. The first light extraction layer 31 and the third light extraction layer 33 have lower refractive indices, which are beneficial to reducing the refractive index difference with other film layers and avoiding the total reflection phenomenon caused by refractive index mismatch, which is beneficial to improving the light extraction efficiency and power consumption benefits, thereby improving the performance of the display panel 100 and the performance of the display device.

[0124] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0125] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0126] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A display function layer is disposed on one side of the substrate; A light extraction layer, located on a side of the display function layer away from the substrate, the light extraction layer comprising a first light extraction layer, a second light extraction layer and a third light extraction layer sequentially stacked in a direction away from the substrate; Among them, the refractive index of the second light extraction layer is greater than the refractive index of the first light extraction layer and the refractive index of the third light extraction layer.

2. The display panel according to claim 1, characterized in that: The refractive index of the second light extraction layer is greater than or equal to 1.5; Preferably, the refractive index of the second light extraction layer is greater than or equal to 2 and less than or equal to 2.2; Preferably, the refractive index of the first light extraction layer and the refractive index of the third light extraction layer are less than or equal to 1.5; Preferably, the refractive index of the first light extraction layer and the refractive index of the third light extraction layer are less than or equal to 1.45; Preferably, the refractive index of the first light extraction layer is equal to the refractive index of the third light extraction layer.

3. The display panel according to claim 1, characterized in that: The display panel further comprises a buffer layer, wherein the buffer layer is arranged on a side of the light extraction layer away from the display function layer; Preferably, the material of the buffer layer includes lithium fluoride or potassium fluoride; Preferably, the refractive index of the buffer layer is smaller than the refractive index of the third light extraction layer; Preferably, the difference between the refractive index of the buffer layer and the refractive index of the third light extraction layer is less than or equal to 0.3; Preferably, the difference between the refractive index of the buffer layer and the refractive index of the third light extraction layer is less than or equal to 0.15; Preferably, the refractive index of the buffer layer is greater than or equal to 1.2 and less than or equal to 1.

4.

4. The display panel according to claim 1, characterized in that: The thickness of the light extraction layer is less than or equal to 90 nm; Preferably, the thickness of the second light extraction layer is greater than the thickness of the first light extraction layer and the thickness of the third light extraction layer; Preferably, the thickness of the first light extraction layer is equal to the thickness of the third light extraction layer; Preferably, the thickness of the second light extraction layer is greater than or equal to 50 nm and less than or equal to 70 nm; Preferably, the thickness of the first light extraction layer and the thickness of the third light extraction layer are greater than or equal to 10 nm and less than or equal to 20 nm.

5. The display panel according to claim 1, characterized in that: The display function layer includes a plurality of light-emitting devices and a pixel definition layer, the pixel definition layer defines a plurality of pixel openings, the light-emitting devices are at least partially located within the corresponding pixel openings, and the light-emitting devices include a first electrode, a light-emitting function layer, and a second electrode, which are sequentially stacked in a direction away from the substrate.

6. The display panel according to claim 5, characterized in that: The display panel further comprises a filter layer, wherein the filter layer is arranged on a side of the display function layer away from the substrate; Preferably, the luminescent functional layer comprises a red luminescent functional layer, a green luminescent functional layer and a blue luminescent functional layer; the filter layer comprises a red light filter, a blue light filter and a green light filter, the red light filter is arranged opposite to the red light luminescent functional layer, the green light filter is arranged opposite to the green light luminescent functional layer, and the blue light filter is arranged opposite to the blue light luminescent functional layer; Preferably, the blue light filter has a transmittance of blue light greater than or equal to 65%; Preferably, the blue light filter has a transmittance of blue light greater than or equal to 75%; Preferably, the thickness of the blue light filter is less than or equal to 5 μm; Preferably, the orthographic projection of the red light emitting functional layer on the substrate is located within the orthographic projection of the corresponding red light filter on the substrate; Preferably, the orthographic projection of the green light emitting functional layer on the substrate is located within the orthographic projection of the corresponding green light filter on the substrate; Preferably, the orthographic projection of the blue light emitting functional layer on the substrate is located within the orthographic projection of the corresponding blue light filter on the substrate.

7. The display panel according to claim 6, characterized in that: The display panel further comprises a light shielding layer, the light shielding layer is arranged on a side of the light-emitting functional layer away from the substrate, the light shielding layer comprises a plurality of light-transmitting openings, the plurality of light-transmitting openings comprises a red light-transmitting opening, a green light-transmitting opening and a blue light-transmitting opening, the red light filter is at least partially located in the corresponding red light-transmitting opening, the green light filter is at least partially located in the corresponding green light-transmitting opening, and the blue light filter is at least partially located in the corresponding blue light-transmitting opening; Preferably, the orthographic projection of the red light transparent opening on the substrate is located within the orthographic projection of the corresponding red light filter on the substrate; Preferably, the orthographic projection of the green light transparent opening on the substrate is located within the orthographic projection of the corresponding green light filter on the substrate; Preferably, the orthographic projection of the blue light transparent opening on the substrate is located within the orthographic projection of the corresponding blue light filter on the substrate; Preferably, the display panel further comprises an optical adhesive layer, and the optical adhesive layer is arranged on a side of the filter layer and the light shielding layer away from the substrate; Preferably, the display panel further comprises a cover plate, and the cover plate is arranged on a side of the optical adhesive layer away from the substrate.

8. The display panel according to claim 7, characterized in that: The orthographic projection of the red light emitting functional layer on the substrate is located within the orthographic projection of the corresponding red light transmitting opening on the substrate, the orthographic projection of the green light emitting functional layer on the substrate is located within the orthographic projection of the corresponding green light transmitting opening on the substrate, and the orthographic projection of the blue light emitting functional layer on the substrate is located within the orthographic projection of the corresponding blue light transmitting opening on the substrate; Preferably, the edge of the orthographic projection of the red light emitting functional layer on the substrate has a first distance from the edge of the orthographic projection of the corresponding red light transmitting opening on the substrate, the edge of the orthographic projection of the green light emitting functional layer on the substrate has a second distance from the edge of the orthographic projection of the corresponding green light transmitting opening on the substrate, and the edge of the orthographic projection of the blue light emitting functional layer on the substrate has a third distance from the edge of the orthographic projection of the corresponding blue light transmitting opening on the substrate; wherein the third distance is smaller than the first distance and the second distance; Preferably, the first distance is equal to the second distance.

9. The display panel according to claim 1, characterized in that: The display panel further comprises an encapsulation layer, wherein the encapsulation layer is arranged on a side of the light extraction layer away from the substrate; Preferably, the display panel further comprises a touch layer, and the touch layer is arranged on a side of the encapsulation layer away from the substrate.

10. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-9.

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