CN115884618A - Display panel and display device - Google Patents

Abstract

The present application relates to a display panel and a display device. The display panel includes a substrate, a display layer group, a first electrode and a functional layer. One side, the functional layer, covers the side of the first electrode away from the display layer group, and the functional layer is configured as a conductive layer. The display panel can reduce or eliminate the voltage drop and improve brightness uniformity.

Description

Display panel and display device

technical field

The present application relates to the field of display technology, in particular to a display panel and a display device.

Background technique

In the display panel, in order to ensure a high light transmittance, the thickness of the electrode layer is generally thin, so that the square resistance of the electrode layer is relatively large, resulting in a voltage drop caused by resistance on the display panel, that is, the voltage at different positions on the display panel There are differences that make the brightness of the display panel non-uniform.

Contents of the invention

Based on this, it is necessary to provide a display panel and a display device to solve the problem of uneven brightness of the display panel due to voltage drop.

According to one aspect of the present application, there is provided a display panel, comprising: a substrate; a display layer group located on one side of the substrate; a first electrode disposed on the side of the display layer group away from the substrate and a functional layer disposed on a side of the first electrode away from the display layer group, and the functional layer has conductive properties.

In the display panel provided in the embodiment of the present application, a functional layer is provided on the surface of the first electrode away from the display layer group, and the functional layer has conductive properties. In this way, the layer structure after the combination of the first electrode and the functional layer has conductive properties, Making the combined layer structure have the function of the first electrode is equivalent to increasing the thickness of the first electrode, thereby improving its conductivity, thereby reducing or eliminating the voltage drop of the display panel, and improving the brightness uniformity of the display panel.

In some embodiments, the material of the functional layer includes a host material and a dopant material, and the dopant material has a conductive property. In this way, the functional layer has higher conductivity, thereby improving the brightness uniformity of the display panel.

Optionally, the dopant material is an N-type dopant or a P-type dopant. Based on this, the material selection range of the functional layer is relatively wide, thereby reducing the difficulty of the process.

In some embodiments, the dopant material is an N-type dopant, and the host material is a material with electron transport properties;

Optionally, the host material is one or more of phenanthroline derivatives, triazine derivatives, pyridine derivatives, and conductive polymers;

Optionally, the N-type dopant includes one or more of alkali metals, alkaline earth metals, transition metals, and organic ionic compounds;

Optionally, the doping ratio of the N-type dopant is 1wt%-10wt%.

In some embodiments, the dopant material is a P-type dopant, and the host material is a material with hole transport properties;

Optionally, the host material is one or more of triarylamine derivatives, carbazole derivatives, spirofluorene derivatives, and conductive polymers;

Optionally, the P-type dopant includes a metal oxide with a high work function, an organic semiconductor material with a strong electron withdrawal, a halogen, an acid, a transition metal halide, a transition metal salt, an organic compound or a protonic acid;

Optionally, the doping ratio of the P-type dopant is 3wt%-20wt%.

In some embodiments, the dopants in the functional layer are uniformly distributed. In this way, the molding process of the functional layer is relatively simple.

In some embodiments, along the thickness direction of the display panel, the dopant in the functional layer is non-uniformly distributed.

Optionally, along the thickness direction of the display panel, the doping concentration of the dopant in the functional layer increases sequentially; or, along the thickness direction of the display panel, the dopant in the functional layer The doping concentration decreases sequentially.

In this way, along the thickness direction of the display panel, a plurality of sub-doping materials with different doping concentrations are formed, and the refractive index of each sub-doping material is different, so as to achieve the effect of improving light extraction efficiency.

In some embodiments, the thickness of the functional layer is 50nm-1000nm. The thickness of the functional layer can be adjusted according to the light-emitting viewing angle and power consumption requirements of the light-emitting device.

In some embodiments, the transmittance of the functional layer is ≥60%. In this way, the functional layer has high electrical conductivity and high light transmittance.

In some embodiments, the display panel further includes a second electrode located on the side of the display layer group away from the first electrode; the display layer group includes a plurality of light emitting units disposed on the second electrode ; Wherein, each of the light-emitting units includes at least one organic light-emitting layer; or the first electrode is a cathode or an anode.

According to another aspect of the present application, a display device is further provided, including the aforementioned display panel.

Description of drawings

FIG. 1 shows a schematic structural diagram of a display panel in an embodiment of the present application;

Fig. 2 shows a schematic structural diagram of a functional layer in an embodiment of the present application;

FIG. 3 shows a schematic structural diagram of a display panel in another embodiment of the present application;

FIG. 4 shows a schematic structural diagram of a display panel in another embodiment of the present application.

Explanation of reference numbers:

10. Display panel;

110. Functional layer; 111. Sub-doped layer;

120. Cathode layer;

130. Display layer group; 131. Light emitting layer; 132. Electron transport layer; 133. Hole transport layer;

130a, electroluminescence unit; 131a, organic light-emitting layer;

140. Anode layer;

150. Substrate.

Detailed ways

In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and thus should not be construed as limiting the application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this application, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the present application, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiment.

With the overcoming of various technical problems and the reduction of production costs, the market share of active-matrix organic light-emitting diode (Active-matrix Organic Light-emitting Diode, AMOLED) products has gradually approached 50%. Customers' requirements for product power consumption, lifespan, and image quality are also gradually increasing. The display uniformity of the screen is an important concern in the image quality of AMOLED products, and its influencing factors mainly include the uniformity of the substrate and the uniformity of the cathode.

In current products, in order to ensure a high light transmittance, the thickness of the cathode is generally thin. Therefore, the square resistance of the cathode is relatively large, resulting in a voltage drop (IR drop) caused by resistance on the screen, which eventually leads to different positions. There is a difference in the OLED voltage, which affects the uniformity of the luminous brightness. Usually, the voltage gradually decreases from the edge area of the screen to the central area of the screen, and the brightness decreases accordingly.

The current solutions to the IR drop problem include auxiliary cathode technology and brightness compensation (Demura) technology. The auxiliary cathode technology is to set the auxiliary cathode in the thin film transistor layer under the organic light emitting diode, and connect the auxiliary cathode and the cathode through the reserved via holes, so as to improve the conductivity of the cathode. The basic principle of Demura technology is to let a panel to be compensated display a grayscale image, use a brightness acquisition device, such as a capacitive coupling device camera (Charge Coupled Device, CCD) to capture the panel to be compensated, and obtain each pixel unit in the panel to be compensated Then adjust the grayscale value or voltage of the pixel unit in the area to be compensated (Mura) to brighten the too dark area and darken the too bright area to achieve a uniform display effect. Among them, while the auxiliary cathode technology solves the IR drop problem, it also complicates the structure of the display panel, while the Demura technology essentially does not change the IR drop problem existing in the display panel structure.

In order to solve the above problems, the present application provides a display panel, by using a material with high conductivity to form the cathode covering layer above the cathode, for example, using an N-type doped material or a P-type doped material to form the cathode covering layer, so that both The characteristics of light transmittance and high refractive index of the cathode covering layer are retained, and the cathode covering layer has higher conductivity, so that the conductivity of the cathode is improved without changing the structure of the display panel, and the display panel is weakened or eliminated. The low voltage drop improves the brightness uniformity of the display panel.

FIG. 1 shows a schematic structural diagram of a display panel in an embodiment of the present application.

Referring to FIG. 1 , a display panel 10 provided by an embodiment of the present application includes a substrate 150 , a display layer group 130 , a first electrode and a functional layer 110 . The display layer group 130 is located on one side of the substrate 150, the first electrode is arranged on the side of the display layer group 130 away from the substrate 150, the functional layer 110 is arranged on the side of the first electrode away from the display layer group 130, and the functional layer 110 Has conductive properties.

In the display panel 10 provided in this embodiment, the functional layer 110 is provided on the surface of the first electrode away from the display layer group 130, and the functional layer 110 has a conductive property. In this way, the layer structure of the first electrode and the functional layer 110 It has conductive properties, so that the combined layer structure has the function of the first electrode, which is equivalent to increasing the thickness of the first electrode, so that without changing the overall structure of the display panel 10, the conductivity of the cathode is improved, and then weakened. Alternatively, the voltage drop of the display panel 10 is eliminated to improve the brightness uniformity of the display panel 10 .

In the display panel 10 , the display layer group 130 may include a plurality of light-emitting pixels disposed on the substrate 150 and an encapsulation layer for encapsulating the light-emitting pixels.

In OLED display, in order to improve the light extraction efficiency, a layer of light extraction layer (Capping Layer, CPL) is usually covered on the surface of the cathode, also known as cathode covering layer, capping layer, capping layer, light extraction layer, and optical coupling layer. The optical interference distance is adjusted through the light extraction material of this layer, the external light emission is suppressed, the extinction caused by the movement of the surface plasmon is suppressed, and the luminous efficiency of the OLED device is improved. According to the principle of optical absorption and refraction, the material of this layer needs to have a higher refractive index.

In an exemplary embodiment, the first electrode is the cathode layer 120 , the functional layer 110 is the light extraction layer, and the light extraction layer has conductive properties. In this way, the combined layer structure of the cathode layer 120 and the light extraction layer still has good transmittance, and at the same time, because the light extraction layer has conductive properties, the combined layer structure has the function of the cathode layer 120, which is equivalent to increasing The thickness of the cathode layer 120 is increased, thereby improving the conductivity of the cathode without changing the overall structure of the display panel 10, thereby reducing or eliminating the voltage drop of the display panel 10, and improving the brightness uniformity of the display panel 10.

In some embodiments, the material of the functional layer 110 includes a host material and a dopant material, and the dopant material has a conductive property. Wherein, the dopant material can be formed by evaporation process. It can be understood that substances are divided into conductors, insulators and semiconductors according to their different conductivity. A pure semiconductor that does not contain other impurities is called an intrinsic semiconductor. If a specific impurity is doped into the intrinsic semiconductor to become an impurity semiconductor, its electrical conductivity will be qualitatively improved. When the functional layer 110 is a light extraction layer, the doped material is selected to form the functional layer 110, so that the functional layer 110 not only has the characteristics of high transmittance and high refractive index of the original functional layer 110, but also has higher conductivity, The brightness uniformity of the display panel 10 is improved while ensuring the light extraction function of the functional layer 110 .

Optionally, the dopant material is an N-type dopant or a P-type dopant. Based on this, the material selection range of the functional layer 110 is wider, thereby reducing the difficulty of the process.

In some embodiments, the dopant material is an N-type dopant, and the host material is a material with electron transport properties. Based on this, the functional layer 110 increases the conductivity of the cathode through the arrangement of the conductive material, and at the same time has an electron transport function, thereby improving the light extraction efficiency of the display panel 10 .

Optionally, the display layer group 130 includes a light emitting layer 131 and an electron transport layer 132 disposed between the light emitting layer 131 and the cathode layer 120, and the doping material of the functional layer 110 is an N-type dopant, and the host material is a Transport properties of organic materials. It can be understood that since the host material of the functional layer 110 is an organic material with electron transport properties, that is, both the host material of the functional layer 110 and the material of the electron transport layer 132 have electron transport properties, based on this, even if the migration of the dopant material There is a difference between the electron transfer rate and the mobility of the material of the electron transport layer 132. Under the joint action of the electron transport layer 132 and the dopant material, the electron transport property can also be improved to a certain extent, which is beneficial to improve the light extraction efficiency of the display panel 10. .

Optionally, the doping material of the functional layer 110 is an N-type dopant, and the host material is one or more of phenanthroline derivatives, triazine derivatives, pyridine derivatives, and conductive polymers. N Type dopants include one or more of alkali metals, alkaline earth metals, transition metals, and organic ion compounds. Wherein, the conductive polymer may specifically be polypyrrole, polybenzodifuranone, etc., and the organic ion compound may specifically be R ₄ N ⁺ , R ₄ P ⁺ (R=CH ₃ , C ₆ H ₅ , etc.). Optionally, the doping ratio of the N-type dopant is 1wt%-10wt%. Based on this, the choice of dopant material and host material is wide.

In some embodiments, the dopant material is a P-type dopant, and the host material is a material with hole transport properties. Based on this, the functional layer 110 increases the conductivity of the cathode and at the same time has a hole transport function through the arrangement of the conductive material, thereby improving the light extraction efficiency of the display panel 10 .

Optionally, the display layer group 130 includes a hole transport layer 133 disposed on the side of the light emitting layer 131 facing away from the cathode layer 120, and the doping material of the functional layer 110 is a P-type dopant, and the host material is a hole transport layer. of organic materials. It can be understood that since the host material of the functional layer 110 is an organic material with hole transport properties, that is, both the host material of the functional layer 110 and the material of the hole transport layer 133 have hole transport properties, based on this, even if doped There is a difference between the mobility of the material and the mobility of the material of the hole transport layer 133. Under the joint action of the hole transport layer 133 and the doping material, the hole transport property can also be improved to a certain extent, which is beneficial to improve the display The light extraction efficiency of the panel 10.

Optionally, the doping material of the functional layer 110 is a P-type dopant, and the host material is one or more of triarylamine derivatives, carbazole derivatives, spirofluorene derivatives, and conductive polymers, and P P-type dopants include metal oxides with high work function, organic semiconductor materials with strong electron-withdrawing, or other P-type dopants. Wherein, the conductive polymer specifically may be polyparaphenylene, polyparaphenylene vinylene, polyaniline, polythiophene, and the like. Strongly electron-withdrawing organic semiconductor materials can specifically be HATCN (2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene), F4TCNQ ( 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane), etc. Other P-type dopants include halogens, acids, transition metal halides, transition metal salts, organic compounds, protic acids, and other materials. Halogen specifically includes Cl ₂ , Br ₂ , I ₂ , IC ₁ , ICl ₃ , IBr, IF ₅ , acids specifically include PF ₅ , AsF ₅ , SbF ₅ , BF ₅ , BCl ₃ , BBr ₅ , SO ₃ , transition metal halides specifically include NbF ₅ , TaF ₅ , MoF ₅ , WF ₅ , RuF ₅ , PtCl ₄ , TiCl ₄ , transition metal salts specifically include AgClO ₄ , AgBF ₄ , HPtCl ₆ , FeCl ₃ , FeTsOH, organic compounds specifically include TCNE (tetracyanoethylene), TCNQ (hexacyanobutadiene), DDO (dichlorodicyano benzoquinone), chloranil, protonic acids specifically include HF, HCl, H ₂ SO ₄ , HNO ₃ , HClO ₄ ), other materials specifically include O ₂ , XeOF ₄ , XeF ₄ , NOSbCl ₆ , NOPF ₆ . Based on this, the choice of dopant material and host material is wide.

In the process of forming the dopant material by evaporation process, the doping concentration of the dopant can be changed by adjusting the process parameters. That is, the dopants in the functional layer 110 may be distributed uniformly or non-uniformly.

In some embodiments, the dopant in the functional layer 110 is evenly distributed, so that the forming process of the functional layer 110 is relatively simple.

In other embodiments, along the thickness direction of the display panel 10 , the dopant in the functional layer 110 is non-uniformly distributed. Specifically, along the thickness direction of the display panel 10, the doping concentration of the dopant in the functional layer 110 increases sequentially; or, along the thickness direction of the display panel 10, the doping concentration of the dopant in the functional layer 110 increases sequentially. decrease.

Fig. 2 shows a schematic structural diagram of a functional layer in an embodiment of the present application.

Based on this, by adjusting the doping concentration, a plurality of sub-doped layers 111 stacked in the thickness direction of the display panel 10 can be formed, and the doping concentrations of each sub-doped layer 111 are the same or different, thereby forming multiple refraction Sub-doped layers 111 with different ratios. Referring to FIG. 1 and FIG. 2 , the number of sub-doped layers 111 can be two, three, four, five or more, and the thickness of each sub-doped layer 111 is the same or different. Specifically, along the thickness direction of the display panel 10, from the side close to the first electrode to the side away from the first electrode, the refractive indices of the multiple sub-doped layers 111 increase sequentially, or decrease sequentially, or increase first and then decrease, or first decrease and then increase. In this way, through the coupling effect of the sub-doped layers 111 with different refractive indices, the light extraction efficiency is improved.

In some embodiments, the thickness of the functional layer 110 is 50nm˜1000nm, such as 100nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm. It can be understood that for the functional layer 110 with the same thickness, the power consumption and light-emitting viewing angle of light-emitting devices that emit different colors of light are different. Therefore, according to the light-emitting viewing angle and power consumption requirements of the light-emitting device, the functional layer 110 The thickness is adjusted to coordinate the light-emitting viewing angle and power consumption of different light-emitting devices, so that the display panel 10 as a whole has a good light-emitting viewing angle and low power consumption.

In some embodiments, the transmittance of the functional layer 110 ≥ 60%, for example, the transmittance of the functional layer 110 is 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96% , 97%, 98%, 99%. In this way, the functional layer 110 has high electrical conductivity and high light transmittance.

FIG. 3 shows a schematic structural diagram of a display panel in another embodiment of the present application. FIG. 4 shows a schematic structural diagram of a display panel in another embodiment of the present application.

Referring to FIG. 1 , FIG. 3 and FIG. 4 , in some embodiments, the display panel 10 further includes a second electrode located on the side of the display layer group 130 away from the first electrode. Optionally, one of the first electrode and the second electrode is the cathode layer 120 , and the other is the anode layer 140 , for example, the first electrode is the cathode layer 120 and the second electrode is the anode layer 140 . The display layer group 130 includes a plurality of light-emitting units arranged on the second electrode, for example, the light-emitting unit is an electroluminescence unit 130a, and each light-emitting unit includes a layer of organic light-emitting layer 131a, or, each light-emitting unit includes a multi-layer organic light-emitting unit. The light-emitting layer 131a, the multi-layer organic light-emitting layer 131a may specifically be two, three, four, five or more organic light-emitting layers stacked and arranged at intervals. In other words, the display layer group 130 located between the second electrode and the first electrode includes one or more light-emitting layers to form a single-layer OLED display panel or a stacked OLED display panel, that is, the high-conductivity OLED display panel provided by this application The display panel 10 in which the functional layer 110 increases cathode conductivity is suitable for single-layer OLED display panels and laminated OLED display panels.

Specifically, the light emitting device of the present application may be an upright device or an inverted device.

In an exemplary embodiment, the display layer group includes an electron injection layer, an electron transport layer, a hole blocking layer, a light-emitting layer, an electron blocking layer, a hole transport layer, and a hole injection layer stacked in sequence, and the first electrode is The cathode is arranged on the side of the electron injection layer away from the electron transport layer, and the functional layer is arranged on the side of the cathode away from the electron injection layer. Wherein, the host material of the functional layer may be an electron transport material or a hole transport material. It should be noted that although electron transport materials and hole transport materials have different abilities to transport electrons and holes, both electron transport materials and hole transport materials have both the ability to transport electrons and the ability to transport holes. Therefore, when the main material of the functional layer is a hole transport material, disposing the functional layer on the surface of the cathode can still improve the conductivity of the cathode and the light extraction efficiency to a certain extent.

In another exemplary embodiment, the display layer group includes an electron injection layer, an electron transport layer, a hole blocking layer, a light emitting layer, an electron blocking layer, a hole transport layer, a hole injection layer, and a first electrode stacked in sequence. The anode is arranged on the side of the hole injection layer away from the hole transport layer, and the functional layer is arranged on the side of the anode away from the hole injection layer. Wherein, the host material of the functional layer may be an electron transport material or a hole transport material. Since the electron transport material and the hole transport material both have the ability to transport electrons and the ability to transport holes, therefore, when the main material of the functional layer is an electron transport material, the functional layer is placed on the surface of the anode, and it can still be used at a certain level. To a certain extent, it plays the role of improving the conductivity of the anode and improving the light extraction efficiency.

Optionally, the display panel 10 includes a partition wall, which partitions the cathode layer 120 into a plurality of cathode strips arranged in a row direction or a column direction. When the cathode layer 120 of the display panel 10 is cut off, the voltage drop will further increase, and the display panel 10 provided by the embodiment of the present application, since the functional layer 110 is provided on the cathode layer 120, and the functional layer 110 has high conductivity, The conductivity of the cathode is improved, which can effectively reduce or eliminate the voltage drop, thereby solving the problem of low brightness uniformity of the display panel adopting the cathode partition structure.

Based on the same purpose of the invention, the present application also provides a display device, including the display panel in the above embodiment. Wherein, the display panel may specifically be a single-layer OLED display panel or a laminated OLED display panel, and may further be an AMOLED display panel.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (10)

1. A display panel, characterized in that, comprising: Substrate; a display layer group located on one side of the substrate; a first electrode disposed on a side of the display layer set away from the substrate; and The functional layer is arranged on the side of the first electrode away from the display layer group, and the functional layer has a conductive property. 2. The display panel according to claim 1, wherein the material of the functional layer comprises a host material and a doping material, and the doping material has a conductive property; Preferably, the dopant material is an N-type dopant or a P-type dopant. 3. The display panel according to claim 2, wherein the dopant material is an N-type dopant, and the host material is a material having electron transport properties; Preferably, the host material is one or more of phenanthroline derivatives, triazine derivatives, pyridine derivatives, and conductive polymers; Preferably, the N-type dopant includes one or more of alkali metals, alkaline earth metals, transition metals, and organic ionic compounds; Preferably, the doping ratio of the N-type dopant is 1wt%-10wt%. 4. The display panel according to claim 2, wherein the dopant material is a P-type dopant, and the host material is a material having hole transport properties; Preferably, the host material is one or more of triarylamine derivatives, carbazole derivatives, spirofluorene derivatives, and conductive polymers; Preferably, the P-type dopant includes a metal oxide with a high work function, an organic semiconductor material with a strong electron withdrawal, a halogen, an acid, a transition metal halide, a transition metal salt, an organic compound or a protonic acid; Preferably, the doping ratio of the P-type dopant is 3wt%-20wt%. 5 . The display panel according to claim 2 , wherein the dopant in the functional layer is uniformly distributed. 6. The display panel according to any one of claims 2-4, characterized in that, along the thickness direction of the display panel, the dopant in the functional layer is non-uniformly distributed; Preferably, along the thickness direction of the display panel, the doping concentration of the dopant in the functional layer increases sequentially; or, along the thickness direction of the display panel, the dopant concentration of the dopant in the functional layer The doping concentration decreases sequentially. 7. The display panel according to any one of claims 2-4, characterized in that, the thickness of the functional layer is 50 nm˜1000 nm. 8. The display panel according to any one of claims 2-4, wherein the transmittance of the functional layer is ≥60%. 9. The display panel according to any one of claims 2-4, further comprising a second electrode located on a side of the display layer group away from the first electrode; The display layer group includes a plurality of light emitting units arranged on the second electrode; Wherein, the light-emitting unit includes at least one organic light-emitting layer; or The first electrode is a cathode or an anode. 10. A display device, comprising the display panel according to any one of claims 1-9.

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