Display panel and display device
By employing pTSF devices and a specific light extraction layer structure in OLED display panels, the problems of insufficient luminous efficiency and lifespan have been solved, achieving high-efficiency and long-life display effects, and improving color shift at wide viewing angles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BLACK COW FOOD
- Filing Date
- 2026-05-26
- Publication Date
- 2026-07-24
AI Technical Summary
The luminous efficiency and lifespan of existing OLED display panels need to be improved.
By employing pTSF devices and setting up a light extraction sublayer with a high-low-high or low-high-low refractive index in its light extraction layer, combined with the differentiated design of the light extraction layer thickness for different light-emitting devices, the luminous efficiency can be improved and the lifetime extended.
It achieves improved luminous efficiency and extended lifespan, while also improving color shift at wide viewing angles, thus achieving a balance between luminous efficiency, lifespan, and viewing angle.
Smart Images
Figure CN122458671A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and in particular to a display panel and a display device. Background Technology
[0002] In recent years, OLED (Organic Light Emitting Diode) display panels have received increasing attention due to their advantages such as self-emission, low power consumption, high brightness, and high response speed. However, the luminous efficiency and lifespan of OLED display panels still need to be improved. Summary of the Invention
[0003] This application provides a display panel and a display device that can improve the luminous efficiency of the display panel and extend its lifespan.
[0004] A first aspect of this application provides a display panel, the display panel comprising: Substrate; An array layer is disposed on one side of the substrate; Multiple light-emitting devices are disposed on the side of the array layer away from the substrate. Each light-emitting device includes a first electrode, a light-emitting layer, a second electrode, and a light extraction layer stacked sequentially in the direction away from the substrate. The multiple light-emitting devices include a first light-emitting device, which is a pTSF device. The light extraction layer of the first light-emitting device includes a first light extraction sublayer, a second light extraction sublayer, and a third light extraction sublayer stacked sequentially in the direction away from the substrate. The refractive index of the second light extraction sublayer is greater than that of the first light extraction sublayer and the third light extraction sublayer, or the refractive index of the second light extraction sublayer is less than that of the first light extraction sublayer and the third light extraction sublayer.
[0005] Wherein, the refractive index of the first light extraction sublayer is in the range of 1.4 to 1.8, and / or the refractive index of the second light extraction sublayer is in the range of 1.4 to 1.8, and / or the refractive index of the third light extraction sublayer is in the range of 1.4 to 1.8.
[0006] Wherein, the refractive index of the first light extraction sublayer is equal to the refractive index of the third light extraction sublayer.
[0007] Wherein, the thickness of the second light extraction sub-layer is greater than the thickness of the first light extraction sub-layer and the third light extraction sub-layer; Preferably, the thickness of the first light extraction sublayer is equal to the thickness of the third light extraction sublayer.
[0008] The first light-emitting device is a green light-emitting device.
[0009] The plurality of light-emitting devices further include a second light-emitting device, which is a red light-emitting device, and the thickness of the light extraction layer of the second light-emitting device is greater than the thickness of the light extraction layer of the first light-emitting device.
[0010] The plurality of light-emitting devices further include a third light-emitting device, which is a blue light-emitting device, and the thickness of the light extraction layer of the first light-emitting device is greater than the thickness of the light extraction layer of the third light-emitting device; Preferably, the light extraction layer of the second light-emitting device is a single-layer structure, and / or the light extraction layer of the third light-emitting device is a single-layer structure.
[0011] Wherein, the thickness of the light extraction layer of the second light-emitting device is in the range of 600nm~1100nm, and / or the thickness of the light extraction layer of the first light-emitting device is in the range of 600nm~750nm, and / or the thickness of the light extraction layer of the third light-emitting device is in the range of 400nm~600nm.
[0012] Specifically, on the CIE1931 standard chromaticity diagram, the color gamut area of the display panel with three primary colors reaches at least 95% of the complete ITU-R BT.2020 standard color gamut area.
[0013] A second aspect of this application provides a display device including the display panel described above.
[0014] The beneficial effects are as follows: On the one hand, this application sets the first light-emitting device as a pTSF device, which can make the first light-emitting device have a narrower emission spectrum, improve the luminous efficiency of the first light-emitting device, and extend its lifespan. On the other hand, this application also sets the light extraction layer of the first light-emitting device as a stacked structure, including a first light extraction sub-layer, a second light extraction sub-layer, and a third light extraction sub-layer stacked in sequence, forming a structure with a high-low-high or low-high-low refractive index. This structure can further achieve spectral narrowing, improve the color gamut, improve the luminous efficiency of the first light-emitting device, and extend its lifespan based on the first light-emitting device being a pTSF device. It can also achieve a balance between the luminous efficiency, lifespan, and viewing angle of the display panel. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1This is a schematic diagram of the structure of one embodiment of the display panel of this application; Figure 2 yes Figure 1 A schematic diagram of the structure of the light-emitting device in one embodiment; Figure 3 This is a schematic diagram of the structure of the first light-emitting device, the second light-emitting device, and the third light-emitting device in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of the first light-emitting device, the second light-emitting device, and the third light-emitting device in another embodiment of this application; Figure 5 This is a schematic diagram of one embodiment of the display device of this application. Detailed Implementation
[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0017] It should be noted that the terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.
[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0019] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0020] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0021] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0022] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0023] See Figure 1 , Figure 1 This is a schematic diagram of a display panel according to an embodiment of the present application. The display panel 100 includes a substrate 110, an array layer 120, a pixel definition layer 130, a light-emitting device 140, and an encapsulation layer 150.
[0024] The substrate 110 serves a supporting function in the display panel 100. It can be a flexible substrate or a rigid substrate. When the substrate 110 is a flexible substrate, its material can be polyimide (PI), or it can be a multilayer structure with alternating organic and inorganic layers. For example, the substrate 110 includes inorganic layers, organic layers, and inorganic layers stacked sequentially. In this case, the multilayer structure with alternating organic and inorganic layers can balance the flexibility and strength of the substrate 110, so that the final product has a bendable function and can resist breakage and deformation. When the substrate 110 is a rigid substrate, its material can be glass or metal. This application does not limit the structure of the substrate 110.
[0025] An array layer 120 is disposed on one side of the substrate 110. The array layer 120 mainly includes a driving circuit for driving the light-emitting devices 140 to emit light. One driving circuit can drive only one light-emitting device 140 to emit light, or one driving circuit can drive multiple light-emitting devices 140 to emit light simultaneously. In one embodiment, the array layer 120 may include a first conductive layer, a second conductive layer, a third conductive layer, a fourth conductive layer, and a planarization layer disposed on one side of the substrate 110 and stacked sequentially. An insulating layer is disposed between adjacent conductive layers. The driving circuit may include a transistor and a storage capacitor. The transistor includes a semiconductor, a gate, a source, and a drain. The storage capacitor includes a first electrode and a second electrode disposed opposite to each other and spaced apart. The gate and the first electrode can be located in the first conductive layer, the second electrode can be located in the second conductive layer, the source and drain can be located in the third conductive layer, and a signal line is provided in the fourth conductive layer. This signal line electrically connects the driving circuit and the light-emitting device 140. The planarization layer is used to perform planarization to ensure the flatness of the display panel 100. The planarization layer has vias, and the light-emitting device 140 is electrically connected to the signal line through the vias provided in the planarization layer. The driving circuit can be, for example, a 2T1C circuit, a 7T1C circuit, a 7T2C circuit, or a 9T1C circuit, etc., and this application does not limit its specific structure.
[0026] A pixel definition layer 130 is disposed on the side of the array layer 120 opposite to the substrate 110, and is used to define the position of the light-emitting device 140. The pixel definition layer 130 has pixel openings, and at least a portion of the light-emitting device 140 is disposed in the pixel openings. The pixel definition layer 130 may be formed of an organic material such as polyimide (PI), polyamide, benzocyclobutene (BCB), acrylic resin, or phenolic resin, or of an inorganic material such as silicon nitride, or may include both organic and inorganic materials. In one embodiment, the material of the pixel definition layer 130 includes a light-absorbing material to absorb ambient light and reduce the reflectivity of the display panel 100.
[0027] There are multiple light-emitting devices 140, and the light-emitting colors of the multiple light-emitting devices 140 are not exactly the same. (See reference...) Figure 2 The light-emitting device 140 includes a first electrode 141, a light-emitting layer 142, a second electrode 143, and a light extraction layer 144, which are sequentially stacked in the direction away from the substrate 110.
[0028] The first electrode 141 can be an anode, and the second electrode 143 can be a cathode. The first electrode 141 can include a multilayer structure, such as a reflective layer and a pair of conductive oxide layers covering the upper and lower surfaces of the reflective layer, respectively. The reflective layer can be formed, for example, using silver, a metal material with excellent light reflectivity. Each conductive oxide layer can be formed, for example, using a transparent conductive oxide such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), or IGZO (Indium Gallium Zinc Oxide). The second electrode 143 can be formed, for example, using a metal material such as an alloy of magnesium and silver (MgAg). In other embodiments, the first electrode 141 can also be a cathode, and the second electrode 143 can be an anode. In this embodiment, the first electrode 141 can be disposed between the array layer 120 and the pixel definition layer 130, and a portion of the first electrode 141 is exposed through a pixel opening.
[0029] The light-emitting layer 142 may include a hole injection layer HIL, a hole transport layer HTL, an electron blocking layer EBL, a light-emitting material layer EML, a hole blocking layer HBL, an electron transport layer ETL, and an electron injection layer EIL, stacked along a direction away from the substrate 110. It should be noted that, except for the light-emitting material layer EML, the light-emitting layer 142 may only include a portion of the hole injection layer HIL, hole transport layer HTL, electron blocking layer EBL, hole blocking layer HBL, electron transport layer ETL, and electron injection layer EIL. Furthermore, the number of light-emitting material layers EML in the light-emitting layer 142 can be one or more, such as two, and is not limited here. To enable the light-emitting layer 142 to emit light, a pixel voltage is provided to the first electrode 141 and a common voltage is provided to the second electrode 143, forming a potential difference between the first electrode 141 and the second electrode 143, causing the light-emitting layer 142 disposed between the first electrode 141 and the second electrode 143 to emit light.
[0030] The light extraction layer 144, also known as the CPL (Capping Layer), is mainly used to improve the light extraction efficiency of the light-emitting device 140, reduce its power consumption, reduce ambient light reflection, and improve the viewing angle. Its material can be organic, inorganic, or a combination of both.
[0031] The encapsulation layer 150 is used to encapsulate the light-emitting device 140, which helps to prevent external moisture and oxygen from affecting the light-emitting device 140. The light emitted by the light-emitting device 140 can pass through the encapsulation layer 150. The encapsulation layer 150 includes multiple inorganic encapsulation film layers and at least one organic encapsulation film layer stacked together. The at least one organic encapsulation film layer is disposed between the multiple inorganic encapsulation film layers, forming a closed space that seals the organic encapsulation film layer. In one embodiment, the inorganic and organic encapsulation film layers can be stacked alternately. The inorganic encapsulation film layers can be set as the uppermost and lowermost layers of the encapsulation layer 150, and the outermost inorganic encapsulation film layer can completely cover the organic encapsulation film layer, thereby forming a barrier space that prevents water and oxygen from entering. In one application scenario, the encapsulation layer 150 includes a first encapsulation layer, a second encapsulation layer, and a third encapsulation layer stacked sequentially in a direction away from the substrate 110. The materials of the first and third encapsulation layers include inorganic materials, and the material of the second encapsulation layer includes organic materials.
[0032] It should be noted that the display panel 100 may also include a touch layer (not shown) and a cover plate (not shown). The touch layer is located on the side of the encapsulation layer 150 opposite to the substrate 110 and is used to implement touch functionality. The touch layer can be a self-capacitive touch layer or a mutual-capacitive touch layer. The cover plate is located on the side of the touch layer opposite to the substrate 110, and the cover plate can be made of glass to provide protection.
[0033] See Figure 3 In one embodiment, the plurality of light-emitting devices 140 include a first light-emitting device 140a, which is a pTSF device. The light extraction layer 144 of the first light-emitting device 140a includes a first light extraction sublayer 1441, a second light extraction sublayer 1442, and a third light extraction sublayer 1443 sequentially stacked in the direction away from the substrate 110. The refractive index of the second light extraction sublayer 1442 is greater than that of the first light extraction sublayer 1441 and the third light extraction sublayer 1443, or the refractive index of the second light extraction sublayer 1442 is less than that of the first light extraction sublayer 1441 and the third light extraction sublayer 1443.
[0034] Specifically, the first light-emitting device 140a is fabricated using pTSF (phosphor-assisted TADF-sensitized fluorescence) technology. Specifically, the luminescent material layer (EML) in the luminescent layer 142 of the first light-emitting device 140a includes a host material, a sensitizer, and a dye. The host material includes thermally activated delayed fluorescence (TADF), such as a polymer based on carbazole or triphenylamine. The sensitizer includes a phosphorescent sensitizer, and the dye includes a fluorescent luminescent material. In pTSF technology, the phosphorescent sensitizer transfers exciton energy to the fluorescent material, causing it to emit light. By using pTSF technology for the first light-emitting device 140a, the luminous efficiency of the first light-emitting device 140a can be significantly improved. Simultaneously, pTSF technology retains the narrow fluorescence spectrum characteristic, ensuring that the emission spectrum of the first light-emitting device 140a has a narrow characteristic.
[0035] Meanwhile, in the light extraction layer 144 of the first light-emitting device 140a, the refractive index of the second light extraction sub-layer 1442 is greater than or less than the refractive index of the first light extraction sub-layer 1441 and the third light extraction sub-layer 1443 on both sides. Thus, the light extraction layer 144 of the first light-emitting device 140a forms a structure with a high-low-high or low-high-low refractive index. This structure can further achieve spectral narrowing, improve color gamut, improve luminous efficiency of the first light-emitting device 140a, and extend lifespan, based on the first light-emitting device 140a being a pTSF device. It can also achieve a balance between the luminous efficiency, lifespan, and viewing angle of the display panel 100.
[0036] In one embodiment, when the light-emitting material layer EML in the first light-emitting device 140a is formed by vapor deposition, the main material, sensitizer and dye included in the light-emitting material layer EML can be vapor deposited in the same chamber, that is, the main material, sensitizer and dye are placed in the same vapor deposition chamber, which can improve the preparation efficiency.
[0037] In one embodiment, during the fabrication process, a mask can be used to fabricate the light extraction layer 144 in the first light-emitting device 140a. Specifically, the mask has a cutout area corresponding to the first light-emitting device 140a. During the fabrication process, each fabrication material passes through the cutout area through the mask to reach the substrate 110 to obtain each sublayer in the light extraction layer 144.
[0038] It should be noted that this application does not specifically limit the manufacturing process of the display panel 100.
[0039] In one embodiment, the refractive index of the first light extraction sublayer 1441 is in the range of 1.4 to 1.8. For example, the refractive index of the first light extraction sublayer 1441 is 1.4, 1.5, 1.6, 1.7 or 1.8, etc.
[0040] In one embodiment, the refractive index of the second light extraction sublayer 1442 is in the range of 1.4 to 1.8. For example, the refractive index of the second light extraction sublayer 1442 is 1.4, 1.35, 1.55, 1.75, or 1.8, etc.
[0041] In one embodiment, the refractive index of the third light extraction sublayer 1443 is in the range of 1.4 to 1.8. For example, the refractive index of the third light extraction sublayer 1443 is 1.4, 1.65, 1.7 or 1.8, etc.
[0042] The refractive indices of the first light extraction sublayer 1441, the second light extraction sublayer 1442, and the third light extraction sublayer 1443 can all be set to be between 1.4 and 1.8 (in this case, it is sufficient to ensure that the refractive index of the second light extraction sublayer 1442 is greater than or less than the refractive indices of the first light extraction sublayer 1441 and the third light extraction sublayer 1443 on either side of it). Alternatively, the refractive index of one or both of the first light extraction sublayer 1441, the second light extraction sublayer 1442, and the third light extraction sublayer 1443 can be set to be between 1.4 and 1.8. Setting the refractive index range as described above can reduce the requirements for materials, reduce the difficulty of the process, and improve the preparation efficiency.
[0043] In one embodiment, the refractive index of the first light extraction sublayer 1441 is equal to the refractive index of the third light extraction sublayer 1443. This arrangement allows the first light extraction sublayer 1441 and the third light extraction sublayer 1443 to be fabricated using the same materials and the same fabrication process, reducing fabrication difficulty and improving fabrication efficiency.
[0044] Of course, in other embodiments, the refractive index of the first light extraction sublayer 1441 may not be equal to the refractive index of the third light extraction sublayer 1443, and the specific setting is made according to actual needs.
[0045] In one embodiment, the thickness of the second light extraction sub-layer 1442 is greater than the thickness of the first light extraction sub-layer 1441 and the third light extraction sub-layer 1443. Specifically, the thickness of the second light extraction sub-layer 1442 is set to be the largest, which can be matched with the refractive indices of the first light extraction sub-layer 1441, the second light extraction sub-layer 1442, and the third light extraction sub-layer 1443 to further improve the luminous efficiency of the display panel 100.
[0046] In one embodiment, the thickness of the first optical extraction sublayer 1441 is equal to the thickness of the third optical extraction sublayer 1443. This arrangement allows the first optical extraction sublayer 1441 and the third optical extraction sublayer 1443 to be fabricated using the same process, thereby improving fabrication efficiency.
[0047] In one embodiment, the first light-emitting device 140a is a green light-emitting device. In other embodiments, the first light-emitting device 140a may also be a red light-emitting device or a blue light-emitting device.
[0048] In one embodiment, see Figure 3 , Figure 3 This is a schematic diagram of the structure of a plurality of light-emitting devices 140 in one embodiment of this application. The first light-emitting device 140a is a green light-emitting device. The plurality of light-emitting devices 140 also includes a second light-emitting device 140b, which is a red light-emitting device. The thickness of the light extraction layer 144 of the second light-emitting device 140b is greater than the thickness of the light extraction layer 144 of the first light-emitting device 140a.
[0049] That is, the thickness of the light extraction layer 144 of the red light-emitting device is greater than the thickness of the light extraction layer 144 of the green light-emitting device. This setting can improve the luminous efficiency of the red light-emitting device and extend its lifespan. On the other hand, it can also adjust the viewing angle brightness decay of the red light-emitting device to match that of the green light-emitting device. In other words, the light extraction layer 144 of the red light-emitting device is different from that of the green light-emitting device.
[0050] Since the thickness of the light extraction layer 144 in the second light-emitting device 140b is different from the thickness of the light extraction layer 144 in the first light-emitting device 140a, that is, the light extraction layer 144 of the second light-emitting device 140b and the light extraction layer 144 of the first light-emitting device 140a are different, the light extraction layer 144 of the second light-emitting device 140b and the light extraction layer 144 of the first light-emitting device 140a can be deposited in different chambers during the fabrication process. That is, the light extraction layer 144 of the second light-emitting device 140b is deposited in one chamber and the light extraction layer 144 of the first light-emitting device 140a is deposited in another chamber.
[0051] In one embodiment, see Figure 4 , Figure 4This is a schematic diagram of the structure of multiple light-emitting devices 140 in another embodiment of this application. The multiple light-emitting devices 140 also include a third light-emitting device 140c, which is a blue light-emitting device. The thickness of the light extraction layer 144 of the first light-emitting device 140a is greater than the thickness of the light extraction layer 144 of the third light-emitting device 140c. That is, the thickness of the red light-emitting device is greater than the thickness of the green light-emitting device, and the thickness of the green light-emitting device is greater than the thickness of the red light-emitting device. This arrangement can match the viewing angle brightness decay of the red, green, and blue light-emitting devices, improve the overall brightness decay of the display panel 100, balance the light emission viewing angles of the red, green, and blue light-emitting devices, and improve the color shift problem of the display panel 100 at large viewing angles.
[0052] Of course, in other embodiments, the thickness of the light extraction layer 144 of the first light-emitting device 140a can be set to be equal to or less than the thickness of the light extraction layer 144 of the third light-emitting device 140c, for example in... Figure 3 In this embodiment, the thickness of the light extraction layer 144 of the first light-emitting device 140a is equal to the thickness of the light extraction layer 144 of the third light-emitting device 140c.
[0053] In one embodiment, see Figure 3 as well as Figure 4 The light extraction layer 144 of the second light-emitting device 140b and the third light-emitting device 140c are both single-layer structures. This configuration simplifies the fabrication process of the light extraction layers 144 of the second and third light-emitting devices 140b and 144 of the third light-emitting device 140c, improving fabrication efficiency. The light extraction layers 144 of the second and third light-emitting devices 140b and 144 of the third light-emitting device 140c have the same structure, and during fabrication, they can be simultaneously deposited in a single evaporation chamber.
[0054] In other embodiments, only the light extraction layer 144 of the second light-emitting device 140b may be a single-layer structure, while the light extraction layer 144 of the third light-emitting device 140c may be a stacked structure. In this case, the structure of the light extraction layer 144 of the third light-emitting device 140c may be the same as the structure of the light extraction layer 144 of the first light-emitting device 140a. Alternatively, only the light extraction layer 144 of the third light-emitting device 140c may be a single-layer structure, while the light extraction layer 144 of the second light-emitting device 140b may be a stacked structure. In this case, the structure of the light extraction layer 144 of the second light-emitting device 140b may be the same as the structure of the light extraction layer 144 of the first light-emitting device 140a.
[0055] In one embodiment, the thickness of the light extraction layer 144 of the second light-emitting device 140b is in the range of 600nm to 1100nm, for example, 600nm, 700nm, 900nm or 1100nm.
[0056] In one embodiment, the thickness of the light extraction layer 144 of the first light-emitting device 140a is in the range of 600nm to 750nm, for example, 600nm, 650nm, 700nm or 750nm.
[0057] In one embodiment, the thickness of the light extraction layer 144 of the third light-emitting device 140c is in the range of 400nm to 600nm, for example, 400nm, 500nm or 600nm.
[0058] The above-mentioned thickness range setting can ensure that the luminous efficiency of each light-emitting device 140 meets the requirements, and can also avoid increasing the thickness of the display panel 100.
[0059] In one embodiment, on the CIE1931 standard chromaticity diagram, the color gamut area of the three primary colors of the display panel 100 reaches at least 95% of the complete ITU-R BT.2020 standard color gamut area, that is, the display panel 100 is a wide color gamut display panel.
[0060] Specifically, to make the display panel 100 a wide color gamut display panel, it is generally necessary to narrow the spectrum of the display panel 100 and improve color purity. However, a narrower spectrum means that more useful photons are trapped inside the cavity of the light-emitting device 140 and cannot be emitted. In order to achieve the target brightness, it is necessary to increase the driving current of the light-emitting device 140, thereby aggravating power consumption and aging of the light-emitting device 140. In other words, to make the display panel 100 a wide color gamut display panel, some efficiency must be sacrificed, resulting in low efficiency and poor lifespan of the light-emitting device 140 in the display panel 100. In this application, based on the display panel 100 being a wide color gamut display panel, by setting the first light-emitting device 140a as a pTSF device and setting the light extraction layer 144 of the first light-emitting device 140a, including the first light extraction sub-layer 1441, the second light extraction sub-layer 1442, and the third light extraction sub-layer 1443 stacked in sequence, the luminous efficiency of the first light-emitting device 140a can be significantly improved, the lifespan of the first light-emitting device 140 can be extended, and the defects existing in the wide color gamut display panel can be overcome.
[0061] One way to make the display panel 100 a wide color gamut display panel is to select a suitable material for the light-emitting material layer EML in the light-emitting device 140. However, the specific method of making the display panel 100 a wide color gamut display panel is existing technology and will not be described in detail here.
[0062] It should also be noted that the display panel in this application can be an OLED display panel (Organic Light Emitting Diode) or a QLED display panel (Quantum Dot Light Emitting Diode). This application does not limit the type of display panel.
[0063] This application also protects a display device, see reference. Figure 5 The display device 200 includes a display panel 210, which has the same structure as the display panel 100 in any of the above embodiments. For details, please refer to the relevant content above, which will not be repeated here.
[0064] The display device 200 can be any electronic product with display function, such as a television, tablet computer, laptop computer, smart bracelet, desktop monitor, digital camera, smart glasses, vehicle display, etc. This application does not limit the specific type of display device 200.
[0065] In summary, this application, on the one hand, sets the first light-emitting device 140a as a pTSF device, which enables the first light-emitting device 140a to have a narrower emission spectrum, improve the luminous efficiency of the first light-emitting device 140a, and extend its lifespan. On the other hand, this application also sets the light extraction layer 144 of the first light-emitting device 140a as a stacked structure, including a first light extraction sub-layer 1441, a second light extraction sub-layer 1442, and a third light extraction sub-layer 1443 stacked sequentially, forming a structure with high-low-high or low-high-low refractive index. This structure can further achieve spectral narrowing, improve color gamut, improve the luminous efficiency of the first light-emitting device 140a, and extend its lifespan based on the first light-emitting device 140a being a pTSF device. It can also achieve a balance between the luminous efficiency, lifespan, and viewing angle of the display panel 100.
[0066] Furthermore, this application also sets the thickness of the light extraction layer 144 of the second light-emitting device 140b to be greater than the thickness of the light extraction layer 144 of the first light-emitting device 140a. On the one hand, this can improve the luminous efficiency of the second light-emitting device 140b and extend its lifespan. On the other hand, it can also adjust the viewing angle brightness decay of the second light-emitting device 140b to match the viewing angle brightness decay of the first light-emitting device 140a.
[0067] Furthermore, the thickness of the light extraction layer 144 of the second light-emitting device 140b, the light extraction layer 144 of the first light-emitting device 140a, and the light extraction layer 144 of the third light-emitting device 140c decreases sequentially, which enables the viewing angle brightness decay matching of the second light-emitting device 140b, the first light-emitting device 140a, and the third light-emitting device 140c, improves the overall brightness decay of the display panel 100, balances the light emission viewing angle of the second light-emitting device 140b, the first light-emitting device 140a, and the third light-emitting device 140c, and improves the color shift problem of the display panel 100 at large viewing angles.
[0068] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A display panel, characterized in that, The display panel includes: Substrate; An array layer is disposed on one side of the substrate; Multiple light-emitting devices are disposed on the side of the array layer away from the substrate. Each light-emitting device includes a first electrode, a light-emitting layer, a second electrode, and a light extraction layer stacked sequentially in the direction away from the substrate. The multiple light-emitting devices include a first light-emitting device, which is a pTSF device. The light extraction layer of the first light-emitting device includes a first light extraction sublayer, a second light extraction sublayer, and a third light extraction sublayer stacked sequentially in the direction away from the substrate. The refractive index of the second light extraction sublayer is greater than that of the first light extraction sublayer and the third light extraction sublayer, or the refractive index of the second light extraction sublayer is less than that of the first light extraction sublayer and the third light extraction sublayer.
2. The display panel according to claim 1, characterized in that, The refractive index of the first light extraction sublayer is in the range of 1.4 to 1.8, and / or the refractive index of the second light extraction sublayer is in the range of 1.4 to 1.8, and / or the refractive index of the third light extraction sublayer is in the range of 1.4 to 1.
8.
3. The display panel according to claim 1, characterized in that, The refractive index of the first light extraction sublayer is equal to the refractive index of the third light extraction sublayer.
4. The display panel according to claim 1, characterized in that, The thickness of the second light extraction sublayer is greater than the thickness of the first light extraction sublayer and the third light extraction sublayer; Preferably, the thickness of the first light extraction sublayer is equal to the thickness of the third light extraction sublayer.
5. The display panel according to claim 1, characterized in that, The first light-emitting device is a green light-emitting device.
6. The display panel according to claim 5, characterized in that, The plurality of light-emitting devices further include a second light-emitting device, the second light-emitting device being a red light-emitting device, wherein the thickness of the light extraction layer of the second light-emitting device is greater than the thickness of the light extraction layer of the first light-emitting device.
7. The display panel according to claim 6, characterized in that, The plurality of light-emitting devices further includes a third light-emitting device, the third light-emitting device being a blue light-emitting device, wherein the thickness of the light extraction layer of the first light-emitting device is greater than the thickness of the light extraction layer of the third light-emitting device; Preferably, the light extraction layer of the second light-emitting device is a single-layer structure, and / or the light extraction layer of the third light-emitting device is a single-layer structure.
8. The display panel according to claim 7, characterized in that, The thickness of the light extraction layer of the second light-emitting device ranges from 600 nm to 1100 nm, and / or the thickness of the light extraction layer of the first light-emitting device ranges from 600 nm to 750 nm, and / or the thickness of the light extraction layer of the third light-emitting device ranges from 400 nm to 600 nm.
9. The display panel according to claim 1, characterized in that, On the CIE 1931 standard chromaticity diagram, the color gamut area of the display panel with three primary colors reaches at least 95% of the full ITU-R BT.2020 standard color gamut area.
10. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 9.