Display panel and display device

Abstract

The application provides a display panel and a display device. The display panel comprises a substrate, a display function layer arranged on one side of the substrate, and a light extraction layer located on the side of the display function layer away from the substrate. The light extraction layer comprises a first light extraction layer, a second light extraction layer and a third light extraction layer arranged in sequence in the direction away from the substrate. 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. The display panel provided by the application has a high refractive index of the second light extraction layer, which is beneficial to improving the microcavity effect and the light extraction efficiency. The refractive index of the first light extraction layer and the third light extraction layer is low, which is beneficial to reducing the refractive index difference between the display panel and other film layers, avoiding total reflection caused by the mismatch of the refractive index, improving the light extraction efficiency and power consumption, and improving the performance of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) is an active-matrix light-emitting device with a sandwich structure consisting of multiple organic layers and electrodes on both sides. Currently, AMOLED (Active-Matrix Organic Light-Emitting Diode) based displays have been commercialized in fields such as smartphones, watches, and laptops.

[0003] However, existing displays suffer from low light extraction efficiency. Summary of the Invention

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

[0005] For the purposes described above, this application provides a display panel comprising:

[0006] substrate;

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

[0008] A light extraction layer is located on the side of the display functional layer away from the substrate. The light extraction layer includes a first light extraction layer, a second light extraction layer, and a third light extraction layer stacked sequentially along the direction away from the substrate.

[0009] The refractive index of the second light extraction layer is greater than that of the first light extraction layer and 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 and the refractive index of the third light extraction layer are equal.

[0015] In one embodiment, the display panel further includes a buffer layer disposed on the side of the light extraction layer away from the display functional 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 less 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 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 and the thickness of the third light extraction layer are equal;

[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 thicknesses of the first light extraction layer and the third light extraction layer are 15 nm.

[0028] In one embodiment, the display functional layer includes a plurality of light-emitting devices and a pixel definition layer, the pixel definition layer defining a plurality of pixel openings, the light-emitting devices being at least partially located within the corresponding pixel openings, and the light-emitting devices including a first electrode, a light-emitting functional layer and a second electrode sequentially stacked along a direction away from the substrate.

[0029] In one embodiment, the display panel further includes a filter layer disposed on the side of the display functional layer away from the substrate;

[0030] Preferably, the light-emitting functional layer includes a red light-emitting functional layer, a green light-emitting functional layer, and a blue light-emitting functional layer; the filter layer includes a red light filter, a blue light filter, and a green light filter, wherein the red light filter is disposed opposite to the red light-emitting functional layer, the green light filter is disposed opposite to the green light-emitting functional layer, and the blue light filter is disposed opposite to the blue light-emitting functional layer;

[0031] Preferably, the blue light filter has a transmittance of 65% or more for blue light;

[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 disposed on the side of the light-emitting functional layer away from the substrate. The light-shielding layer includes a plurality of light-transmitting openings, including red light-transmitting openings, green light-transmitting openings, and blue light-transmitting openings. A red light filter is at least partially located within a corresponding red light-transmitting opening, a green light filter is at least partially located within a corresponding green light-transmitting opening, and a blue light filter is at least partially located within a corresponding blue light-transmitting opening.

[0039] Preferably, the orthographic projection of the red light-transmitting 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-transmitting 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-transmitting 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 includes an optical adhesive layer disposed on the side of the light filter layer and the light shielding layer away from the substrate;

[0043] Preferably, the display panel further includes a cover plate disposed on the 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 and the edge of the orthographic projection of the corresponding red light-transmitting opening on the substrate are at a first distance; the edge of the orthographic projection of the green light-emitting functional layer on the substrate and the edge of the orthographic projection of the corresponding green light-transmitting opening on the substrate are at a second distance; and the edge of the orthographic projection of the blue light-emitting functional layer on the substrate and the edge of the orthographic projection of the corresponding blue light-transmitting opening on the substrate are at a third distance; 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 includes an encapsulation layer disposed on the side of the light extraction layer away from the substrate;

[0049] Preferably, the display panel further includes a touch layer disposed on the side of the encapsulation layer away from the substrate.

[0050] Based on the same inventive concept, this application also discloses a display device, which includes the display panel described in any of the above claims.

[0051] Compared with the prior art, the display panel provided in this application has a light extraction layer comprising a first light extraction layer, a second light extraction layer, and a third light extraction layer sequentially stacked along the direction away from the substrate. The refractive index of the second light extraction layer is greater than that of the first and third light extraction layers. The higher refractive index of the second light extraction layer is beneficial for enhancing the microcavity effect and improving light extraction efficiency. The lower refractive indices of the first and third light extraction layers help to reduce the refractive index difference with other film layers, avoiding total internal reflection caused by refractive index mismatch. This improves light extraction efficiency and power consumption, thereby enhancing the performance of the display panel. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

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

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

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

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

[0061] Marker explanation:

[0062] 100. Display panel;

[0063] 1. Substrate;

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

[0065] 3. Optical extraction layer; 31. First optical extraction layer; 32. Second optical extraction layer; 33. Third optical extraction layer;

[0066] 4. Buffer layer;

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

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

[0069] 7. Encapsulation layer;

[0070] 8. Touch layer;

[0071] 91. Optical adhesive layer; 92. Cover plate. Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0073] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" 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 panels are currently a hot topic in display panel research, offering advantages such as low energy consumption, low cost, self-emissive nature, wide viewing angle, and fast response time. To improve light transmittance and reduce panel thickness, current OLED display panels typically employ PLP (Pol-Less Panel) technology. Common PLP technologies include integrating the color filter (CF) into the encapsulation layer (COE). However, display panels using COE technology suffer from low light extraction efficiency.

[0075] Based on this, this 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 this application includes a substrate 1, a display functional layer 2, and a light extraction layer 3. The display functional layer 2 is disposed on one side of the substrate 1, and the light extraction layer 3 is located on the side of the display functional 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 along the 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] The higher refractive index of the second light extraction layer 32 is beneficial to improving the microcavity effect and light extraction efficiency. The lower refractive indices of the first light extraction layer 31 and the third light extraction layer 33 are beneficial to reducing the refractive index difference with other film layers, avoiding total internal reflection caused by refractive index mismatch, and improving light extraction efficiency and power consumption, thereby improving the performance of the display panel 100.

[0078] Among them, the microcavity effect enables the light emitted from the display functional layer 2 to be reflected and interfered with multiple times within the cavity, increasing the interaction between the light and the cavity wall, thereby improving the coupling efficiency of light from the display functional 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 beneficial for improving the microcavity effect and thus improving the light extraction efficiency. For example, 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 beneficial for improving the microcavity effect and avoiding the influence of excessively high refractive index on the spectral characteristics and light output efficiency of the microcavity, thereby reducing the performance and stability of the microcavity. For example, 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 helps to reduce the refractive index difference with other film layers and avoid total internal reflection caused by refractive index mismatch. For example, 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. For example, 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 and the refractive index of the third light extraction layer 33 are equal, and the same material can be selected for easy preparation.

[0084] Reference Figure 2 As shown, in one embodiment, the display panel 100 further includes a buffer layer 4, which is disposed on the side of the light extraction layer 3 away from the display functional layer 2. The buffer layer 4 protects the light extraction layer 3, reduces reflection loss, and prevents charge migration from the encapsulation layer to the light extraction layer 3. Preferably, the material of the buffer layer 4 includes lithium fluoride or potassium fluoride, etc.

[0085] Preferably, the refractive index of the buffer layer 4 is less than that of the third light extraction layer 33, thus 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 total internal reflection caused by refractive index mismatch. 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 0.3, 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. This serves to facilitate a refractive index transition between the third light extraction layer 33 and the encapsulation layer, achieving refractive index matching. For example, the refractive index of the buffer layer 4 may be 1.2, 1.3, 1.4, etc., but no specific limitation is made.

[0089] In one embodiment, the thickness of the light extraction layer 3 is less than or equal to 90 nm, which is beneficial for further improving the light extraction efficiency. For example, 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 helps 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. For example, 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. For example, 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 thicknesses of the first light extraction layer 31 and the third light extraction layer 33 are 15 nm.

[0095] Reference Figure 3 As shown, in one embodiment, the display functional 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 within the corresponding pixel openings 211. Each light-emitting device 22 includes a first electrode 221, a light-emitting functional layer 222, and a second electrode 223 sequentially stacked along a direction away from the substrate 1. By applying a voltage to the first electrode 221 and the second electrode 223, the light-emitting functional layer 222 emits light.

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

[0097] The anode effectively draws externally supplied current into the light-emitting device 22. The light-emitting functional layer 222 is the core of the light-emitting device 22, containing organic or inorganic materials capable of generating light radiation under an electric field. Different material combinations and structural designs can achieve different colors and brightness levels of light emission. The cathode receives electrons from the external circuit and injects them into the light-emitting device 22. Cathode materials generally have a low work function to facilitate electron injection.

[0098] Furthermore, 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 light filter layer 5, which is disposed on the side of the display functional layer 2 away from the substrate 1. The light filter layer 5 helps to improve 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 multiple filters 51, including red light filters, blue light filters, and green light filters. The red light filters are arranged opposite to the red light-emitting functional layer, the green light filters are arranged opposite to the green light-emitting functional layer, and the blue light filters are arranged opposite to the blue light-emitting functional layer. Different filters 51 correspond to different light-emitting functional layers 222. The brightness decay rate of the light-emitting devices 22 of different colors can be adjusted by changing the thickness of the red, blue, and green light filters, making the brightness decay rate of the three colors of light-emitting devices 22 more 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 other colors of light; the blue light filter is located directly above the blue light emitting functional layer and is used to transmit blue light and filter out other colors of light; the green light filter is located directly above the green light emitting functional layer and is used to transmit green light and filter out other colors of light.

[0102] Preferably, the blue light filter has a blue light transmittance of 65% or higher. Higher blue light transmittance is beneficial for improving blue light efficiency and increasing power consumption savings. For example, the blue light filter has blue light transmittances of 65%, 68%, 70%, 73%, 80%, 90%, 95%, etc.

[0103] Preferably, the blue light filter has a transmittance of blue light 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. More 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, ensuring 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, ensuring 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, ensuring 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 the side of the light-emitting functional layer 222 away from the substrate 1. The light-shielding layer 6 includes a plurality of light-transmitting openings 61, including red light-transmitting openings, green light-transmitting openings, and blue light-transmitting openings. A red light filter is at least partially located within a corresponding red light-transmitting opening, a green light filter is at least partially located within a corresponding green light-transmitting opening, and a blue light filter is at least partially located within a corresponding blue light-transmitting opening. The light-shielding layer 6 helps to improve crosstalk between adjacent light-emitting devices 22 and enhances display quality.

[0109] Preferably, the orthographic projection of the red light transmission 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-transmitting 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 transmission 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 lies within the orthographic projection of the corresponding red light-transmitting opening on the substrate 1; the orthographic projection of the green light-emitting functional layer on the substrate 1 lies within the orthographic projection of the corresponding green light-transmitting opening on the substrate 1; and the orthographic projection of the blue light-emitting functional layer on the substrate 1 lies within the orthographic projection of the corresponding blue light-transmitting opening on the substrate 1. This is beneficial for 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 and the edge of the orthographic projection of the corresponding red light transmitting opening on the substrate 1 are at a first distance; the edge of the orthographic projection of the green light emitting functional layer on the substrate 1 and the edge of the orthographic projection of the corresponding green light transmitting opening on the substrate 1 are at a second distance; and the edge of the orthographic projection of the blue light emitting functional layer on the substrate 1 and the edge of the orthographic projection of the corresponding blue light transmitting opening on the substrate 1 are at a third distance; wherein the third distance is less 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., and is not specifically limited.

[0115] In this embodiment, the increased blue light transmittance leads to an increase in blue light emission, which in turn worsens the problem of extreme blue light bias. This embodiment reduces the amount of blue light emission by decreasing the distance between the blue light transmission opening and the red and green light transmission openings, thereby improving the problem of extreme blue light bias.

[0116] Preferably, the first distance and the second distance are equal.

[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. The encapsulation layer 7 is used to protect the display functional 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 with high density to isolate water and oxygen. The second encapsulation layer includes an organic layer, thus having a large thickness to planarize the surface of the display panel 100. The third encapsulation layer includes an inorganic layer, achieving an inorganic-organic-inorganic three-layer encapsulation. Further, the encapsulation layer 7 is disposed on the side of the light filter layer 5 and the light shielding layer 6 near 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 the side of the encapsulation layer 7 away from the substrate 1, and is used to implement touch functionality. Further, the touch layer 8 is disposed on the side of the light 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, which is disposed on the side of the light filter layer 5 and the light shielding layer 6 away from the substrate 1, and is used to bond with other film layers.

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

[0122] Based on the same inventive concept, another embodiment of this application discloses a display device, which includes the display panel in the above embodiment. Furthermore, the display device includes mobile phones, VR devices, computers, televisions, in-vehicle display devices, etc.

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

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

[0125] It should be noted that the above description describes some embodiments of this 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 a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0126] The embodiments of this 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 this application should be included within the protection scope of this application.

Claims

1. A display panel, characterized in that, include: substrate; A display functional layer is disposed on one side of the substrate; A light extraction layer is located on the side of the display functional layer away from the substrate. The light extraction layer includes a first light extraction layer, a second light extraction layer, and a third light extraction layer stacked sequentially along the direction away from the substrate. Wherein, 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; The display functional 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. The light-emitting devices include a first electrode, a light-emitting functional layer, and a second electrode that are sequentially stacked along a direction away from the substrate. The display panel further includes a light filter layer disposed on the side of the display functional layer away from the substrate; the light-emitting functional layer includes a red light-emitting functional layer, a green light-emitting functional layer, and a blue light-emitting functional layer; the light filter layer includes a red light filter, a blue light filter, and a green light filter, wherein the red light filter is disposed opposite to the red light-emitting functional layer, the green light filter is disposed opposite to the green light-emitting functional layer, and the blue light filter is disposed opposite to the blue light-emitting functional layer; the blue light filter has a transmittance of blue light greater than or equal to 65%; The display panel further includes a light-shielding layer disposed on the side of the light-emitting functional layer away from the substrate. The light-shielding layer includes a plurality of light-transmitting openings, including red light-transmitting openings, green light-transmitting openings, and blue light-transmitting openings. The red light filter is at least partially located within the corresponding red light-transmitting opening, the green light filter is at least partially located within the corresponding green light-transmitting opening, and the blue light filter is at least partially located within the corresponding blue light-transmitting opening. The edge of the orthographic projection of the red light-emitting functional layer on the substrate and the edge of the orthographic projection of the corresponding red light-transmitting opening on the substrate have a first distance; the edge of the orthographic projection of the green light-emitting functional layer on the substrate and the edge of the orthographic projection of the corresponding green light-transmitting opening on the substrate have a second distance; and the edge of the orthographic projection of the blue light-emitting functional layer on the substrate and the edge of the orthographic projection of the corresponding blue light-transmitting opening on the substrate have a third distance; wherein the third distance is smaller than the first distance and the second distance.

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.

3. 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 2 and less than or equal to 2.

2.

4. The display panel according to claim 1, characterized in that, 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.

5. The display panel according to claim 1, characterized in that, 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.

6. The display panel according to claim 1, characterized in that, The refractive index of the first light extraction layer is equal to that of the third light extraction layer.

7. The display panel according to claim 1, characterized in that, The display panel further includes a buffer layer, which is disposed on the side of the light extraction layer away from the display functional layer.

8. The display panel according to claim 7, characterized in that, The material of the buffer layer includes lithium fluoride or potassium fluoride.

9. The display panel according to claim 7, characterized in that, The refractive index of the buffer layer is less than that of the third light extraction layer.

10. The display panel according to claim 7, characterized in that, 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.

11. The display panel according to claim 7, characterized in that, 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.

12. The display panel according to claim 7, characterized in that, The refractive index of the buffer layer is greater than or equal to 1.2 and less than or equal to 1.

4.

13. 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.

14. The display panel according to claim 1, characterized in that, 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.

15. The display panel according to claim 1, characterized in that, The thickness of the first light extraction layer is equal to the thickness of the third light extraction layer.

16. The display panel according to claim 1, characterized in that, The thickness of the second light extraction layer is greater than or equal to 50 nm and less than or equal to 70 nm.

17. The display panel according to claim 1, characterized in that, 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.

18. The display panel according to claim 1, characterized in that, The blue light filter has a transmittance of blue light greater than or equal to 75%.

19. The display panel according to claim 1, characterized in that, The thickness of the blue light filter is less than or equal to 5 μm.

20. The display panel according to claim 1, characterized in that, The orthographic projection of the red light emitting functional layer on the substrate lies within the orthographic projection of the corresponding red light filter on the substrate.

21. The display panel according to claim 1, characterized in that, The orthographic projection of the green light-emitting functional layer on the substrate lies within the orthographic projection of the corresponding green light filter on the substrate.

22. The display panel according to claim 1, characterized in that, The orthographic projection of the blue light emitting functional layer on the substrate lies within the orthographic projection of the corresponding blue light filter on the substrate.

23. The display panel according to claim 1, characterized in that, The orthogonal projection of the red light transmission opening on the substrate is located within the orthogonal projection of the corresponding red light filter on the substrate; The orthogonal projection of the green light-transmitting opening on the substrate is located within the orthogonal projection of the corresponding green light filter on the substrate; The orthographic projection of the blue light-transmitting opening on the substrate lies within the orthographic projection of the corresponding blue light filter on the substrate.

24. The display panel according to claim 1, characterized in that, The display panel further includes an optical adhesive layer disposed on the side of the filter layer and the light-shielding layer away from the substrate.

25. The display panel according to claim 24, characterized in that, The display panel also includes a cover plate disposed on the side of the optical adhesive layer away from the substrate.

26. The display panel according to claim 1, 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.

27. The display panel according to claim 1, characterized in that, The first distance is equal to the second distance.

28. The display panel according to claim 1, characterized in that, The display panel further includes an encapsulation layer disposed on the side of the light extraction layer away from the substrate.

29. The display panel according to claim 28, characterized in that, The display panel further includes a touch layer, which is disposed on the side of the encapsulation layer away from the substrate.

30. A display device, characterized in that, Includes the display panel as described in any one of claims 1-29.

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