Display panel, display screen and electronic equipment

Abstract

The invention relates to the technical field of display panels, and discloses a display panel, a display screen and electronic equipment. The CGL of the display panel comprises an N-CGL, an i-CGL and a P-CGL which are stacked in sequence. Wherein if an organic material is adopted corresponding to the i-CGL, the LUMO energy level of the organic material is less than or equal to-3.5 eV; and the work function of the inorganic material is greater than or equal to 3.5 eV corresponding to the fact that the i-CGL adopts the inorganic material. Particularly, the Fermi level of the i-CGL is lower than the Fermi level of the P-CGL host material, and the thickness of the i-CGL can be any value less than or equal to 15 nm (especially less than 5 nm), in this case, the charge generation capabilities of the N-CGL, the i-CGL and the P-CGL in the direction parallel to the thickness of the CGL are improved, and the sheet resistance in the direction perpendicular to the thickness of the CGL is greater than 1 G [omega] / sq, and the sheet resistance in the direction perpendicular to the thickness of the CGL is greater than 1 G [omega] / sq. According to the embodiment of the invention, the sub-pixels can realize high-efficiency and low-power-consumption light emission, the voltage value obtained by dividing the driving voltage of one sub-pixel from the driving voltage of the other sub-pixel is relatively small, and crosstalk between the sub-pixels is reduced or even eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a display panel, a display screen and an electronic device. Background Art

[0002] Tandem organic light-emitting diode (Tandem OLED) is an OLED device structure formed by stacking multiple traditional OLED devices in series through a charge generation layer (CGL). Display panels manufactured using Tandem OLED technology have the characteristics of high brightness, low power consumption and long life.

[0003] However, since CGL has a high lateral conductivity characteristic (for example, conductivity in a direction parallel to the series connection of OLED devices in the display panel), it will cause lateral light crosstalk between sub-pixels in the Tandem OLED display panel (for example, a red sub-pixel and a blue sub-pixel are adjacent to each other in a pixel. In a scenario where the pixel is required to emit blue light, when a driving voltage is input to the blue sub-pixel to drive the blue sub-pixel to emit blue light, the lateral conductivity of CGL may cause the red sub-pixel to be mistakenly driven to emit a weak red light, thereby causing red light to be mixed with the blue light emitted by the pixel), resulting in problems such as reduced color gamut of the screen, color shift, and abnormal picture display. Summary of the invention

[0004] The embodiments of the present application provide a display panel, a display screen, and an electronic device, which are helpful in reducing or even eliminating crosstalk between sub-pixels in a Tandem OLED display panel.

[0005] In a first aspect, a display panel is provided, which includes: an anode layer, a plurality of light-emitting layers, a cathode and a plurality of charge generation layers; wherein: the plurality of light-emitting layers and the plurality of charge generation layers are arranged between the anode layer and the cathode, and a charge generation layer is arranged between every two light-emitting layers; the charge generation layer includes an N-type charge generation layer, an insertion layer and a P-type charge generation layer stacked in sequence along a first direction, wherein the first direction is the direction from the anode layer to the cathode, and the square resistance of the charge generation layer perpendicular to the first direction is greater than 1 GΩ / □, corresponding to the insertion layer using organic materials, the lowest unoccupied molecular orbital energy level of the organic material is less than or equal to -3.5 eV, corresponding to the insertion layer using inorganic materials, the work function of the inorganic material is greater than or equal to 3.5 eV.

[0006] In the display panel, by adopting a three-layer (N-type charge generation layer, insertion layer and P-type charge generation layer) structure charge generation layer, the square resistance of the charge generation layer of the display panel in a direction perpendicular to the first direction (for example, any direction in the XY plane below, horizontal direction) is greater than 1GΩ / □. In this way, the voltage value obtained by the light-emitting unit of a sub-pixel from the driving voltage of other sub-pixels can be reduced, so that the possibility of the sub-pixel being erroneously driven to emit light by the voltage value obtained by the voltage division can be reduced, which is conducive to reducing or even eliminating the crosstalk between sub-pixels in the Tandem OLED display panel. In addition, compared with the solution of alleviating the crosstalk between sub-pixels by setting isolation columns between sub-pixels, the manufacturing cost of the display panel can be reduced.

[0007] In a possible implementation of the first aspect, the thickness of the insertion layer is less than or equal to 15 nm.

[0008] In this implementation, since the smaller the thickness of the insertion layer, the smaller the square resistance of the insertion layer in the first direction perpendicular to the first direction, when the thickness of the insertion layer is less than or equal to 15nm, the voltage value obtained by the light-emitting unit of a sub-pixel from the driving voltage of other sub-pixels can be further reduced, making it possible for the sub-pixel to be erroneously driven to emit light by the voltage value obtained by the voltage division, which is beneficial to reduce or even eliminate crosstalk between sub-pixels in the Tandem OLED display panel.

[0009] In a possible implementation of the first aspect above, the thickness of the insertion layer is less than or equal to 5 nm.

[0010] In this implementation, since the insertion layer can form a discontinuous thin film on the surface perpendicular to the first direction when the thickness of the insertion layer is less than or equal to 5nm, the square resistance of the insertion layer perpendicular to the first direction is greatly reduced. When the thickness of the insertion layer is less than or equal to 5nm, the voltage value obtained by dividing the driving voltage of a sub-pixel from other sub-pixels can be further reduced, making it possible for the sub-pixel to be erroneously driven to emit light by the voltage value obtained by the voltage division, which is beneficial to reducing or even eliminating crosstalk between sub-pixels in the Tandem OLED display panel.

[0011] In a possible implementation of the first aspect above, the Fermi level of the insertion layer is lower than the Fermi level of a main material of the P-type charge generation layer.

[0012] In this implementation, when the Fermi level of the insertion layer is lower than the Fermi level of the main material of the P-type charge generation layer, an accumulation junction can be formed between the insertion layer and the P-type charge generation layer, which can prevent the driving voltage of the display panel from increasing with the increase of usage time, which is beneficial to reducing the power consumption of the display panel.

[0013] In a possible implementation of the first aspect, the material of the N-type charge generation layer includes a host material and a guest material, and the concentration of the guest material is ∈(0%, 10%].

[0014] In this implementation, since the insertion layer has charge generation capability, the concentration of the guest material in N-type charge generation can be reduced while providing the same charge generation capability to the light-emitting layer.

[0015] In a possible implementation of the first aspect above, the display panel also includes a pixel definition layer, the anode layer includes multiple anodes, and any two adjacent anodes among the multiple anodes are isolated by the pixel definition layer; and corresponding to the adjacent first anode and the second anode among the multiple anodes: the first anode has a top surface facing the cathode layer; the portion of the pixel definition layer located between the first anode and the second anode has a slope angle; the acute angle formed by a line connecting any two points on the surface of the cathode facing the pixel definition layer and the top surface is less than or equal to the slope angle; the acute angle formed by a line connecting any two points on the surface of the cathode facing away from the pixel definition layer and the top surface is less than or equal to the slope angle.

[0016] In this implementation, in the display panel that meets the above structure, the area between any two anodes presents a flat structure, and the surface of the area is continuous, without protrusions and grooves. Such a pixel definition layer has no isolation structure, which can make the cathode continuous and unbroken, reduce the voltage drop on the cathode, and reduce the power consumed by the cathode, thereby making the driving voltage and power consumption of the display panel lower, and avoiding abnormal pixel lighting. In addition, the mask and photolithography process required for the isolation structure can be avoided, thereby simplifying the process and reducing costs. In addition, the reliability of the display panel can also be improved.

[0017] In a possible implementation of the first aspect above, the display panel also includes a hole injection layer, an electron injection layer, multiple hole transport layers, multiple electron transport layers and a substrate; wherein a hole injection layer and a hole transport layer are stacked in sequence along a first direction between the anode layer and the first light-emitting layer closest to the anode layer among the multiple light-emitting layers; an electron transport layer and an electron injection layer are stacked in sequence along the first direction between the cathode and the second light-emitting layer closest to the cathode among the multiple light-emitting layers; an electron transport layer and a hole transport layer are arranged between every two light-emitting layers, and the electron transport layer, the insertion layer and the hole transport layer between every two light-emitting layers are stacked in sequence along the first direction; the substrate is arranged on the side of the anode layer away from the cathode layer.

[0018] In a possible implementation of the first aspect above, the display panel further includes a plurality of hole blocking layers, and a hole blocking layer is disposed between each light-emitting layer and an adjacent electron transport layer.

[0019] In a possible implementation of the first aspect above, the display panel includes a plurality of pixels arranged in an array, each pixel includes four sub-pixels of different colors, and the four sub-pixels in one pixel are arranged in two rows and two columns; wherein, among two adjacent pixels, the color setting mode of the sub-pixels in the first row of one pixel is the same as the color setting mode of the sub-pixels in the second row of the other pixel, and the color setting mode of the sub-pixels in the second row of one pixel is the same as the color setting mode of the sub-pixels in the first row of the other pixel.

[0020] In this implementation, the colors of the sub-pixels near the boundary of two adjacent pixels in a column can be made the same. Thus, two sub-pixels of the same color near the boundary of two adjacent pixels in a column can be prepared through one opening in a fine metal mask, which is beneficial to reducing the manufacturing cost of the display panel.

[0021] In a possible implementation of the first aspect above, the display panel includes a plurality of pixels arranged in an array, each pixel includes four sub-pixels of different colors, and the four sub-pixels in one pixel are arranged in two rows and two columns; wherein, in two adjacent pixels, the color setting mode of the sub-pixels in the first column of one pixel is the same as the color setting mode of the sub-pixels in the second column of the other pixel, and the color setting mode of the sub-pixels in the second column of one pixel is the same as the color setting mode of the sub-pixels in the first column of the other pixel.

[0022] In this implementation, the colors of the sub-pixels near the boundary of two adjacent pixels in a row can be made the same. In this way, two sub-pixels of the same color near the boundary of two adjacent pixels in a row can be prepared through one opening in the fine metal mask, which is beneficial to reducing the manufacturing cost of the display panel.

[0023] In a possible implementation of the first aspect, the four sub-pixels of different colors include a red sub-pixel, a blue sub-pixel, a green sub-pixel, and a cyan sub-pixel.

[0024] In this implementation, each pixel of the display panel is mixed with light emitted by a red sub-pixel, a blue sub-pixel, a green sub-pixel, and a cyan sub-pixel to obtain a color to be displayed.

[0025] In a possible implementation of the first aspect above, each red sub-pixel includes a first auxiliary layer and a red light-emitting unit stacked along a first direction in each light-emitting layer; each green sub-pixel includes a second auxiliary layer and a green light-emitting unit stacked along the first direction in each light-emitting layer; each blue sub-pixel includes a third auxiliary layer and a blue light-emitting unit stacked along the first direction in each light-emitting layer; and each azure sub-pixel includes an azure light-emitting unit in each light-emitting layer.

[0026] In a possible implementation of the first aspect above, the display panel includes two light-emitting layers; and: the light-emitting layer of each red sub-pixel close to the cathode in the two light-emitting layers includes a first auxiliary layer and a red light-emitting unit stacked along a first direction, and the light-emitting layer close to the anode layer in the two light-emitting layers includes a red light-emitting unit; the light-emitting layer of each green sub-pixel close to the cathode in the two light-emitting layers includes a second auxiliary layer and a red light-emitting unit stacked along the first direction, and the light-emitting layer close to the anode layer in the two light-emitting layers includes a red light-emitting unit; the light-emitting layer of each blue sub-pixel close to the cathode in the two light-emitting layers includes a first auxiliary layer and a blue light-emitting unit stacked along the first direction, and the light-emitting layer close to the anode layer in the two light-emitting layers includes a blue light-emitting unit; each cyan sub-pixel includes an cyan light-emitting unit in each light-emitting layer.

[0027] In a possible implementation of the first aspect above, the display panel includes a plurality of pixels arranged in an array, and each pixel includes a red sub-pixel, a blue sub-pixel, and one or more green sub-pixels.

[0028] In this implementation, each pixel of the display panel is mixed with light emitted by a red sub-pixel, a blue sub-pixel, and a green sub-pixel to obtain a color to be displayed.

[0029] In a possible implementation of the first aspect above, the light-emitting unit of each red sub-pixel in each light-emitting layer is a red light-emitting unit; the light-emitting unit of each green sub-pixel in each light-emitting layer is a green light-emitting unit; and the light-emitting unit of each blue sub-pixel in each light-emitting layer is a blue light-emitting unit.

[0030] In a possible implementation of the first aspect above, the display panel further includes a covering layer and an encapsulation layer which are sequentially stacked along the first direction by the cathode.

[0031] In a possible implementation of the first aspect above, the display panel also includes a covering layer, an encapsulation layer, a color conversion layer and a filter layer which are sequentially stacked by the cathode along a first direction, and the light-emitting unit of each red sub-pixel, each green sub-pixel and each blue sub-pixel in each light-emitting layer is a blue light-emitting unit; and the red sub-pixel includes a red conversion unit in the color conversion layer and a red filter unit in the filter layer, the red conversion unit is used to convert the light emitted by the blue light-emitting unit corresponding to the red sub-pixel into red light for emission, and the red filter unit is used to filter the red light emitted by the red conversion unit and then emit red light; the green sub-pixel includes a green conversion unit in the color conversion layer and a red filter unit in the filter layer. A green filter unit, a green conversion unit is used to convert the light emitted by the blue light-emitting unit corresponding to the green sub-pixel into green light for emission, and the green filter unit is used to filter the green light emitted by the green conversion unit and then emit green light; the blue sub-pixel includes a blue conversion unit in the color conversion layer and a blue filter unit in the filter layer, the blue conversion unit is used to convert the light emitted by the blue light-emitting unit corresponding to the blue sub-pixel into blue light for emission, and the blue filter unit is used to filter the blue light emitted by the blue conversion unit and then emit blue light, or the blue sub-pixel includes a blue filter unit in the filter layer, and the blue conversion unit is used to filter the light emitted by the blue light-emitting unit corresponding to the blue sub-pixel and then emit blue light.

[0032] In a possible implementation of the first aspect above, the display panel also includes a covering layer, an encapsulation layer, and a filter layer which are sequentially stacked by a cathode along a first direction, and the light-emitting units of each red sub-pixel, each green sub-pixel, and each blue sub-pixel in multiple light-emitting layers emit white light as a whole; and the red sub-pixel includes a red filter unit in the filter layer, and the red filter unit is used to filter the white light emitted by the light-emitting unit corresponding to the red sub-pixel and then emit red light; the green sub-pixel includes a green filter unit in the filter layer, and the green filter unit is used to filter the white light emitted by the light-emitting unit corresponding to the green sub-pixel and then emit green light; the blue sub-pixel includes a blue filter unit in the filter layer, and the blue filter unit is used to filter the white light emitted by the light-emitting unit corresponding to the blue sub-pixel and then emit blue light.

[0033] In a second aspect, a display screen is provided, which includes the display panel provided by the first aspect and any possible implementation of the first aspect.

[0034] In a possible implementation of the second aspect, the display screen further includes a cover plate, and the cover plate is bonded to the display panel.

[0035] According to a third aspect, an electronic device is provided, comprising a display screen provided by the second aspect or any possible implementation of the second aspect.

[0036] In a possible implementation of the third aspect, the electronic device further includes a structural member, and the display screen is fixed on the structural member.

[0037] It should be noted that the beneficial effects of the second aspect and the third direction can be referred to the first aspect, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 According to some embodiments of the present application, a schematic diagram of a display panel 10 is shown.

[0039] Figure 2A According to some embodiments of the present application, a schematic diagram of an equivalent circuit between a blue sub-pixel B1 and a red sub-pixel R1 in a pixel P1 is shown.

[0040] Figure 2B According to some embodiments of the present application, a schematic diagram of an equivalent circuit between a blue sub-pixel B1 and a red sub-pixel R1 is shown when a driving voltage is input only to the anode of the blue sub-pixel B1 .

[0041] Figure 3A According to some embodiments of the present application, a schematic diagram of adding isolation columns between sub-pixels is shown.

[0042] Figure 3B According to some embodiments of the present application, a comparative schematic diagram of isolation columns is shown when the number of sub-pixels in a pixel increases.

[0043] Figure 4 According to some embodiments of the present application, a schematic structural diagram of a display panel is shown.

[0044] Figure 5A According to some embodiments of the present application, the natural logarithm of the internal resistance In(R e ) and the natural logarithm of the current In(I).

[0045] Figure 5B According to some embodiments of the present application, a schematic diagram of an equivalent resistance of a light-emitting device is shown.

[0046] Fig. 6A According to some embodiments of the present application, the natural logarithm In(R e ) and the natural logarithm of the current In(I).

[0047] Figure 6B According to some embodiments of the present application, a schematic diagram of a curve showing a change in current density in a light-emitting unit with respect to a driving voltage is shown.

[0048] Figure 7 According to some embodiments of the present application, a schematic diagram of a curve of voltage and current of a CGL with different i-CGL thicknesses is shown.

[0049] Fig. 8A According to some embodiments of the present application, a schematic diagram of a curve showing a change in current density of a light-emitting layer with a driving voltage in a display panel using two layers of CGL and three layers of CGL is shown.

[0050] Figure 8B According to some embodiments of the present application, a schematic diagram of a curve showing a change in the luminance of a light-emitting unit in a display panel using two layers of CGL and three layers of CGL as a function of a driving voltage is shown.

[0051] Figure 8C According to some embodiments of the present application, a schematic diagram comparing currents in a two-layer CGL and a three-layer CGL is shown.

[0052] Fig. 9A According to some embodiments of the present application, an energy level diagram of a two-layer CGL is shown.

[0053] Fig. 9B According to some embodiments of the present application, a schematic diagram of an electric field of a two-layer CGL is shown.

[0054] Fig. 10A According to some embodiments of the present application, an energy level diagram of a three-layer CGL is shown.

[0055] Fig. 10B According to some embodiments of the present application, a schematic diagram of an electric field of a three-layer CGL is shown.

[0056] Fig.11A According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 20 is shown.

[0057] Fig. 11B According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 20 ′ is shown.

[0058] FIG. 12A to FIG. 12F According to some embodiments of the present application, schematic diagrams of various sub-pixel arrangements are shown.

[0059] Fig.13A According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 30 is shown.

[0060] Fig. 13B According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 30 ′ is shown.

[0061] FIG. 14A to FIG. 14E According to some embodiments of the present application, schematic diagrams of various sub-pixel arrangements are shown.

[0062] Fig.15A According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 40 is shown.

[0063] Fig. 15B According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 40 ′ is shown.

[0064] Fig.16A According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 50 is shown.

[0065] Fig. 16B According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 50 ′ is shown.

[0066] Fig.17 According to some embodiments of the present application, a schematic diagram of a pixel arrangement and an FF cross section of a display panel 60 is shown.

[0067] Fig.18 According to some implementation examples of the present application, a schematic structural diagram of adjacent first anodes and second anodes in an anode layer and a PDL 30 is shown. DETAILED DESCRIPTION

[0068] For ease of understanding, the basic structure of the Tandem OLED display panel (hereinafter referred to as the display panel) is first introduced.

[0069] For example, Figure 1 According to some embodiments of the present application, a schematic diagram of a display panel 10 is shown.

[0070] like Figure 1 As shown, the display panel 10 includes a plurality of pixels, each of which includes a plurality of sub-pixels, such as a red (red, R) sub-pixel, a green (green, G) sub-pixel, and a blue (blue, B) sub-pixel. For ease of description, the plane of the display panel 10 displaying the picture is defined as an XY plane, and the direction perpendicular to the XY plane is called a Z direction, and any direction in the XY plane can be called a horizontal direction.

[0071] Continue to refer Figure 1, as can be seen from the partial cross-sectional view of a blue sub-pixel in a pixel of the display panel 10 in the A-A section, the display panel 10 may include a substrate 101, and a driving layer 102, an anode 103, a hole injection layer (HIL) 104, a hole transport layer (HTL) 105, light-emitting layer 1 to light-emitting layer n (n is a positive integer greater than 1), a hole blocking layer (HBL) 106, an electron transport layer (ETL) 107, an electron injection layer 108 (EIL), a cathode 109, a capping layer (CPL) 110, and a packaging layer 111 that are sequentially arranged along the Z direction by the substrate 101. Among them, between the i-th (1 ≤ i < n) light-emitting layer (light-emitting layer i) and the (i + 1)-th light-emitting layer (light-emitting layer i + 1), an HBL, an ETL, a CGL, and an HTL are sequentially arranged. The CGL includes an N-type charge generation layer (N-CGL) provided on the side of the CGL close to the anode 103 and a P-type charge generation layer (P-CGL) provided on the side of the CGL close to the cathode 109).

[0072] Among them, the substrate 101 is used to support other layers. In some embodiments, the substrate 101 may be a hard screen glass substrate, a flexible screen substrate, a single crystal silicon substrate, or other substrates, etc. The flexible substrate includes, but is not limited to, substrates such as polyimide (PI), fabric, etc. that can be bent, folded, or arbitrarily deformed, and the silicon substrate includes, but is not limited to, single crystal silicon wafers, etc.

[0073] In some embodiments, the substrate 101 may also be referred to as a substrate.

[0074] The driving layer 102 may include a driving circuit of the display panel 10, and this driving circuit is used to drive the OLED to emit light, and it may be a low-temperature polycrystalline silicon (LTPS), a low-temperature polycrystalline oxide (LTPO), an indium gallium zinc oxide (IGZO), a silicon-based complementary metal oxide semiconductor (CMOS), or other driving circuits.

[0075] The anode layer 103 includes anodes corresponding to each sub-pixel. In some embodiments, the material of the anode can be a metal oxide or nitride, a metal, or an alloy, such as indium tin oxide (ITO), titanium (Ti), silver (Ag), aluminum (Al), titanium nitride (TiN), or an alloy of the above materials. The anode can generate holes under an external driving voltage, and the holes from the anode will move to the light-emitting layer under the driving voltage applied by the driving layer 102.

[0076] In some embodiments, each anode in the anode layer 103 is separated by a pixel defining layer (PDL) (also referred to as a pixel definition layer).

[0077] The HIL 104 is a functional layer for injecting holes into the HTL 105. In some embodiments, the material of the HIL 104 may be a material that reduces the hole injection barrier, such as organic materials such as aromatic amines, aromatic hydrocarbons, alicyclic organic compounds and their isotope derivatives (such as hexaazatriphenylhexanitrile (HATCN), copper phthalocyanine (CuPc, etc.)), and inorganic materials such as metal oxides (such as molybdenum trioxide (MoO3), vanadium pentoxide (V2O5), tungsten oxide (WO3), etc.), and metal chlorides (such as ferric chloride (FeCl3), etc.).

[0078] HTL (e.g., HTL 105, HTL disposed between light-emitting layers, etc.) is a functional layer for transporting holes to adjacent light-emitting layers. For example, HTL 105 can transport holes to light-emitting layer 1. In some embodiments, the material of HTL can be organic materials such as aromatic amines, aromatic hydrocarbon organic compounds and their isotopic derivatives (such as TAPC (4-[1-[4-[di(4-methylphenyl)amino]phenyl]cyclohexyl]-N-(3-methylphenyl)-N-(4-methylphenyl)aniline), NPB (N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine), etc.).

[0079] The light-emitting layer (e.g., light-emitting layer 1 to light-emitting layer n) is a functional layer for realizing the light-emitting effect. Each sub-pixel has one or more light-emitting units in each light-emitting layer, that is, a sub-pixel can have at least n light-emitting units respectively arranged in n light-emitting layers. The light-emitting layer includes a host material and a guest material, wherein the host material is composed of aromatic amines, aromatic organic compounds and isotopic derivatives thereof, and the guest material is composed of Ir- or Pt-containing complexes, boron-containing aromatic compounds and isotopic derivatives thereof, and the like, for example, the host material is CBP (4,4'-bis(9-carbazole)biphenyl), the guest material is Ir(ppy)3 (tri(2-phenylpyridine)iridium)), and the like.

[0080] In some embodiments, a pixel may have multiple sub-pixels, e.g. Figure 1 The pixel shown includes a blue sub-pixel, a red sub-pixel, and a green sub-pixel. In other embodiments, a pixel may include other numbers of sub-pixels, such as 4 sub-pixels (e.g., a blue sub-pixel, a red sub-pixel, a green sub-pixel, and a cerulean (C) sub-pixel, or a blue sub-pixel, a red sub-pixel, a green sub-pixel, and a white sub-pixel, etc.), 5 sub-pixels, etc., which are not limited here.

[0081] In some embodiments, one or more auxiliary layers (also called Prime layers) may be provided on the side of some of the light-emitting units in each light-emitting layer of the display panel 10 adjacent to the HTL for microcavity regulation, carrier balance regulation, and blocking electrons and excitons. For the same display panel, the number of auxiliary layers provided for the light-emitting units of sub-pixels of different colors may be different. For example, corresponding to a display panel including two light-emitting layers, a red or green sub-pixel may include an auxiliary layer between the light-emitting units of light-emitting layer 1 and light-emitting layer 2 and the adjacent HTL, while a blue sub-pixel does not have an auxiliary layer in the light-emitting layer. For another example, a red or green sub-pixel may include an auxiliary layer between the light-emitting unit of light-emitting layer 2 and the adjacent HTL, while a blue sub-pixel does not have an auxiliary layer in the light-emitting layer.

[0082] It should be noted that the colors of light emitted by the multiple light-emitting units corresponding to a sub-pixel can be the same or different, and can be the same as the color of the sub-pixel or different from the color of the sub-pixel, which is not limited here. The specific description will be made below in conjunction with the specific light-emitting layer structure, and will not be repeated here.

[0083] In some embodiments, the material of the auxiliary layer may be aromatic amines, aromatic hydrocarbon organic compounds and their isotope derivatives (such as TCTA (4,4',4"-tris(carbazole-9-yl)triphenylamine) etc.).

[0084] The HBL (e.g., HBL 106, HBL disposed between light-emitting layers, etc.) is used to block holes from being transferred to adjacent functional layers. For example, HBL 106 can block holes from being transferred from light-emitting layer n to ETL 107, and can block holes from being transferred from ETL 107 to light-emitting layer n. In some embodiments, the material of the HBL can be an organic aromatic material, such as an organic material containing pyridine, pyrazine, pyrimidine, triazine, imidazole, phenyl, naphthyl, anthracene, phenanthryl, pyrene, etc., or an organic material containing deuterium, tritium, N-pyrene, etc., or an organic material containing the above-mentioned groups. 15Isotope-substituted organic materials, such as BCP (2,9-dimethyl-4,7-biphenyl-1,10-phenanthroline), B4PyMPM (4,6-bis(3,5-di(4-pyridyl)phenyl)-2-methylpyrimidine), BmPyPB (1,3-bis(3,5-dipyridin-3-ylphenyl)benzene) and other organic materials.

[0085] In some embodiments, HBL is optional.

[0086] The ETL (e.g., ETL 107, an ETL disposed between light-emitting layers, etc.) is a functional layer for transmitting electrons. For example, ETL 107 can transmit the electrons injected by EIL 108 to the light-emitting layer n through HBL 106. In some embodiments, the material of the ETL can be an organic aromatic material, such as an organic material containing pyridine, pyrazine, pyrimidine, triazine, imidazole, phenyl, naphthyl, anthracene, phenanthryl, pyrene, etc., or an organic material containing deuterium, tritium, N-pyrene, etc. 15 Isotope-substituted organic materials, such as TmPyPB (1,3,5-tris(3-pyridyl-3-phenyl)benzene), Bphen (4,7-diphenyl-1,10-phenanthroline), TPBi (1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene), or metal complex materials such as 8-hydroxyquinoline lithium (LiQ).

[0087] The EIL 108 is a functional layer for injecting electrons. For example, the EIL 108 can inject electrons from the cathode into the ETL 107. In some embodiments, the material of the EIL 108 can be an organic material such as 8-hydroxyquinoline lithium (LiQ), or an inorganic material such as ytterbium (Yb), lithium (Li), lithium fluoride (LiF), 8-hydroxyquinoline lithium (LiQ), calcium (Ca), cesium (Cs), lithium oxide (Li2O), lithium carbonate (Li2CO3), lithium nitride (Li3N), cesium carbonate (Cs2CO3), (cesium oxide Cs2O).

[0088] The cathode 109 is used to provide a cathode for the display panel 10. In some embodiments, the cathode material can be a metal or an alloy, such as silver (Ag), magnesium (Mg), aluminum (Al), gold (Au) and other metal materials, and alloys of Ag, Mg, Al, Au and other metals.

[0089] The CPL 110 is used to improve the light extraction efficiency of the display panel 10. In some embodiments, the material of the CPL 110 may be an organic material or an inorganic material, such as LiF, LiQ, etc. In some embodiments, the CPL 110 may be absent.

[0090] The encapsulation layer 111 is used to isolate the functional layer from water and oxygen corrosion. The encapsulation layer 111 can be a flexible screen encapsulation, such as one or more of chemical vapor deposition (CVD), thin film encapsulation (TFE), and atomic layer deposition (ALD), or a hard screen encapsulation, such as glass glue (Frit) and glass cover plate encapsulation.

[0091] The CGL is used to generate charges, such as electrons and holes, under an applied driving voltage. For example, holes and electrons may be generated at the interface of the N-CGL and the P-CGL under an applied driving voltage.

[0092] N-CGL is used to transport electrons at the interface of N-CGL and P-CGL to the adjacent electron transport layer. In some embodiments, N-CGL can be mainly obtained by doping a host material and a guest material. The host material can be an organic aromatic material, such as an organic material containing pyridine, pyrazine, pyrimidine, triazine, imidazole, phenyl, naphthyl, anthracene, phenanthryl, pyrene and the like, or an organic material containing deuterium, tritium, N-CGL and the like. 15 The guest material may include metal materials such as ytterbium (Yb), lithium (Li), samarium (Sm), barium (Ba), cesium (Cs) or calcium (Ca), or metal oxide materials such as lithium oxide (Li2O), lithium carbonate (Li2CO3), cesium oxide (Cs2O), cesium carbonate (Cs2CO3), or organic materials or organic-metal complex materials such as Liq (8-hydroxyquinoline-lithium), Libpp (2-(2',2"-bipyridine-6'-yl)-phenolate lithium).

[0093] P-CGL is used to transport holes at the interface of N-CGL and P-CGL to the adjacent hole transport layer. In some embodiments, P-CGL can be mainly obtained by doping a host material and a guest material. The host material includes an organic aromatic material (such as an organic material containing a primary amine group, a secondary amine group, a tertiary amine group, a quaternary ammonium group, a phenyl group, a naphthyl group, an anthracene group, a phenanthryl group, a pyrene group, a fluorene group, a spirofluorene group, etc.), or an organic material containing the above-mentioned groups deuterium, tritium, N 15Isotope-substituted organic materials (such as TAPC (4-[1-[4-[di(4-methylphenyl)amino]phenyl]cyclohexyl]-N-(3-methylphenyl)-N-(4-methylphenyl)aniline), NPB (N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine), TCTA (4,4',4'-tris(carbazol-9-yl)triphenylamine) and other organic materials). The guest material may include organic materials with a deep lowest unoccupied molecular orbital (LUMO) energy level, such as NDP-9 (4-({2,3-bis[cyano(4-cyano-2,3,5,6-tetrafluorophenyl)methylidene]cyclopropylidene}(cyano)methyl)-2,3,5,6-tetrafluorobenzene-1-carbonitrile), HAT-CN (2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene), F4-TCNQ (tetrafluoro-tetracyanoquinodimethane), or inorganic materials such as indium tin oxide (ITO), molybdenum trioxide (MoO3), vanadium pentoxide (V2O5), ferric chloride (FeCl3), tungsten trioxide (WO3), and rhenium trioxide (ReO3).

[0094] It should be noted that Figure 1 The structure of the display panel 10 shown is only an example. In other embodiments, the display panel 10 may also include more layers, such as a color change layer (CCL) stacked on the encapsulation layer 111, a color filter (CF) sheet (or filter film), etc., which are not limited here.

[0095] The following combination Figure 1 The structure of the display panel 10 shown is taken as an example that the display panel 10 includes two light-emitting layers to introduce the technical solution of the present application.

[0096] As described in the background art, CGL has high lateral conductivity (i.e. Figure 1 In the case shown, the conductivity in the XY plane) will cause that when one sub-pixel is driven to emit light, the current will flow through the CGL to the light-emitting units of other sub-pixels, causing other sub-pixels to emit light incorrectly, which will cause light-emitting crosstalk between sub-pixels in the display panel.

[0097] For example, Figure 2A According to some embodiments of the present application, a schematic diagram of an equivalent circuit between a blue sub-pixel B1 and a red sub-pixel R1 in a pixel P1 is shown.

[0098] like Figure 2AAs shown, based on the partial cross-sectional view of the blue sub-pixel B1 and the red sub-pixel R1 in the pixel P1 along the DD cross-section, it can be known that the driving layer 102 includes an R1 driving circuit corresponding to the red sub-pixel R1 and a B1 driving circuit corresponding to the blue sub-pixel B1, the anode layer 103 includes an R1 anode corresponding to the red sub-pixel R1 and a B1 anode corresponding to the blue sub-pixel B1, the light-emitting layer 1 includes a light-emitting unit R1-1 corresponding to the red sub-pixel R1 and a light-emitting unit 1-1 corresponding to the blue sub-pixel B1, the light-emitting layer 2 includes a light-emitting unit R1-2 corresponding to the red sub-pixel R1 and a light-emitting unit B1-2 corresponding to the blue sub-pixel B1, and the cathode 109 is connected to the negative voltage ELVSS. When the display panel 10 drives the blue sub-pixel B1 to emit light, the forward voltage ELVDD-B1 can be input to the B1 anode, so that the light-emitting unit B1-1 and the light-emitting unit B1-2 emit light.

[0099] Continue to refer Figure 2A , the circuit of the blue sub-pixel B1 and the red sub-pixel R1 can be simplified to the equivalent resistance R of the light-emitting unit R1-1, the light-emitting unit R1-2, the light-emitting unit R1-1, the light-emitting unit R1-2 and the CGL. CGL The positive electrode of the light emitting unit R1-1 is used to receive the positive driving voltage ELVDD-R1 of the red sub-pixel R1, and the negative electrode of the light emitting unit R1-1 is connected to the positive electrode of the light emitting unit R1-2 and the equivalent resistance R of CGL. CGL The positive electrode of the light-emitting unit B1-1 is used to receive the positive driving voltage ELVDD-B1 of the blue sub-pixel B1, and the negative electrode of the light-emitting unit B1-1 is connected to the positive electrode of the light-emitting unit B1-2 and the equivalent resistance R of CGL. CGL At the other end, the cathode of the light emitting unit R1-2 and the cathode of the light emitting unit B1-2 are connected to the negative voltage ELVSS. The display panel 10 can drive the light emitting units R1-1 and R1-2 to emit light by inputting a positive driving voltage ELVDD-R1 to the anode of R1 through the R1 driving circuit, so that the red sub-pixel R1 emits red light, or drive the light emitting units B1-1 and B1-2 to emit light by inputting a positive driving voltage ELVDD-B1 to the anode of B1 through the B1 driving circuit, so that the blue sub-pixel B1 emits blue light, or simultaneously input a positive driving voltage to the anodes of R1 and R2 to drive the red sub-pixel R1 and the blue sub-pixel B1 to emit light.

[0100] based on Figure 2A The simplified circuit shown in FIG. 1 is an equivalent circuit when only the blue sub-pixel B1 in the pixel P1 is driven to emit light. Figure 2B Assume that the voltage at the connection point between the light emitting unit B1-1 and the light emitting unit B1-2 at CGL is V CGL, since the light-emitting unit R1-2 (equivalent resistance is R R1-2 ) and resistor R CGL If connected in series, the voltage across the light-emitting unit R1-2 is R R1-2 / (R R1-2 +R CGL )×(V CGL -ELVSS). If R R1-2 / (R R1-2 +R CGL )×(V CGL -ELVSS) is greater than the light-emitting voltage of the light-emitting unit R1-2, the light-emitting unit R1-2 will emit red light, resulting in the actual color of the light emitted by the pixel P1 being a mixture of the lights emitted by the light-emitting units R1-2, B1-1, and B1-2, which is different from the desired blue.

[0101] It should be noted that the crosstalk between other sub-pixels of the same pixel, or the equivalent circuits between sub-pixels of different pixels and the occurrence of crosstalk can be referred to Figure 2A and Figure 2B The crosstalk between the red sub-pixel R1 and the blue sub-pixel B1 is not described in detail here.

[0102] In order to avoid problems such as reduced color gamut, color shift, and abnormal image display of the display panel due to crosstalk between different sub-pixels, in some embodiments, isolation columns can be added between different sub-pixels to block the lateral transmission path of current in the CGL, thereby avoiding the erroneous driving of other sub-pixels to emit light due to the lateral conductivity of the CGL when driving one sub-pixel to emit light.

[0103] For example, Figure 3A According to some embodiments of the present application, a schematic diagram of adding isolation columns between sub-pixels is shown.

[0104] like Figure 3A As shown, referring to the partial cross-sectional view along the section line EE between the red sub-pixel R1 and the blue sub-pixel B1, an isolation column can be added to the CGL to block the current propagation path of the red sub-pixel R1 and the blue sub-pixel B1 in the CGL. Figure 3A The equivalent circuit shown, R CGL This is equivalent to a circuit break, so that both ends of the light-emitting unit R1 - 2 do not have a voltage division obtained from the driving voltage of the blue sub-pixel B1 , thereby preventing the light-emitting unit R1 - 2 from emitting light.

[0105] However, adding spacers to CGL requires additional process steps such as photolithography masks and photolithography, which means that additional processes need to be introduced to add spacers, resulting in increased manufacturing costs for display panels. Moreover, as the number of sub-pixels in a single pixel increases, the number of spacers that need to be added will also increase significantly, further increasing the design difficulty and manufacturing cost of adding spacers to CGL. For example, Figure 3B When the number of sub-pixels in a single pixel increases from 3 to 4, the number of isolation columns in the local area will increase from 20 to 40, greatly increasing the design difficulty and manufacturing cost of the isolation columns. In addition, the display panel with the addition of isolation columns will also have reliability issues. When the display panel faces bending, long-term high brightness, squeezing and other scenes, the failure of the isolation columns may easily lead to the performance degradation of the display panel. For example, the display panel may have defects such as dark spots, black spots, and abnormal pixel light emission.

[0106] In view of this, an embodiment of the present application provides a display panel, in which a CGL structure different from that in the display panel 10 is adopted, so that the CGL has a larger horizontal square resistance (equivalent to an increase of Figure 2A and Figure 2B In the equivalent circuit shown, R CGL Thus, when the square resistance of CGL is large enough, it can be ensured that when a sub-pixel emits light, the voltage value obtained by the light-emitting unit of the sub-pixel adjacent to the sub-pixel from the driving voltage of the sub-pixel is smaller than the light-emitting voltage of the light-emitting unit in the adjacent sub-pixel, and the light-emitting unit of the sub-pixel adjacent to the sub-pixel will not emit light, thus avoiding lateral crosstalk between sub-pixels.

[0107] For example, for Figure 2B In the case shown, it is assumed that the light-emitting voltage of the light-emitting unit R1-2 is V o-R , if R CGL The value is greater than (V CGL -ELVSS-V O-R )×R R1-2 / V O-R , when the blue sub-pixel B1 emits light, the voltage value R obtained by the light-emitting unit R1-2 from the driving voltage of the blue sub-pixel B1 is R1-2 / (R R1-2 +R CGL )×(V CGL -ELVSS) is less than V o-R , the light-emitting unit R1-2 will not emit light, thereby avoiding crosstalk.

[0108] Specifically, refer to Figure 4Compared with the CGL in the aforementioned display panel 10, the CGL of the display panel has an additional insertion layer (hereinafter referred to as i-CGL) between the N-CGL and the P-CGL, that is, the CGL includes the N-CGL, the i-CGL and the P-CGL stacked in sequence along the Z direction. Among them, the i-CGL can be made of organic material or inorganic material. If the i-CGL is made of organic material, the LUMO energy level of the organic material is less than or equal to -3.5 eV; if the i-CGL is made of inorganic material, the work function of the inorganic material is greater than or equal to 3.5 eV.

[0109] In some embodiments, the thickness of the i-CGL can be any value less than 15 nm. In this case, the square resistance of the i-CGL in the direction perpendicular to the thickness of the i-CGL (i.e., the aforementioned lateral direction or any direction in the XY plane) is greater than 1 GΩ / □.

[0110] In some embodiments, the material of i-CGL may be HATCN, CuPC, etc. It should be noted that in other embodiments, the material of i-CGL may also be other materials satisfying the LUMO energy level less than -3.5 eV or the work function higher than 3.5 eV, which is not limited here.

[0111] In this way, the square resistance of i-CGL in the direction perpendicular to the thickness of i-CGL (i.e., the aforementioned lateral direction or any direction in the XY plane) can be made greater than 1 GΩ / □, thereby reducing the voltage value obtained by dividing the driving voltage of another sub-pixel by the light-emitting unit in one sub-pixel, and preventing the light-emitting unit in one sub-pixel from erroneously emitting light because the voltage value obtained by dividing the driving voltage of other pixels is higher than the light-emitting voltage.

[0112] In some embodiments, the doping concentration of the guest material in the N-CGL may be less than or equal to 100%, for example, 0% to 10%, and illustratively, 0.5% to 3%.

[0113] In some embodiments, the thickness of the N-CGL is less than or equal to any value of 40 nm, and illustratively can be any value between 5 and 15 nm.

[0114] In some embodiments, the doping concentration of the guest material in the P-CGL may be less than or equal to 100%, for example, 0% to 20%, and illustratively may be 1%.

[0115] In some embodiments, the mobility of the i-CGL is greater than or equal to 10 -6 cm 2 V -1 s -1 .

[0116] For ease of description, the following Figure 4The CGL shown in FIG. 1 includes N-CGL, i-CGL, and P-CGL stacked in sequence along the Z direction, which is called a three-layer CGL. Figure 1 The CGL shown including the N-CGL and the P-CGL sequentially stacked in the Z direction is called a two-layer CGL.

[0117] In some embodiments, the i-CGL can be used to generate charges, such as electrons and holes. Therefore, relative to the two-layer CGL, when the CGL achieves the same charge generation capability, the charge generation capability to be provided by the N-CGL and P-CGL in the three-layer CGL is lower than the charge generation capability to be provided by the N-CGL and P-CGL in the two-layer CGL. Since the charge generation capability of the N-CGL and P-CGL is positively correlated with the doping concentration of the guest material, the doping concentration of the guest material in the N-CGL and P-CGL in the three-layer CGL can be lower than the doping concentration of the guest material in the N-CGL and P-CGL in the three-layer CGL.

[0118] In some embodiments, since the molecular diameter of organic materials with a LUMO energy level less than -3.5 eV is generally less than 5 nm, and the atomic diameter of inorganic materials with a work function higher than 3.5 eV is generally When the thickness of the i-CGL is less than or equal to 5 nm, the i-CGL will be formed in the lateral direction of the display panel (for example, Figure 1 In this way, the voltage value obtained by dividing the driving voltage of another sub-pixel by the light-emitting unit in one sub-pixel can be further reduced, thereby preventing the light-emitting unit in one sub-pixel from erroneously emitting light due to a higher voltage value obtained by dividing the driving voltage of other pixels.

[0119] The following is based on Figure 2B The equivalent circuit shown introduces the principle of i-GCL increasing the lateral resistance to reduce.

[0120] Generally speaking, the internal resistance of the light-emitting unit can be calculated by formula (1):

[0121] R e =e δ / I α (1)

[0122] In formula (1), R e is the internal resistance of the light-emitting unit, I is the current of the light-emitting unit, e is the natural base, and δ is a constant (due to e δIt is strongly related to the energy gap of the light-emitting unit, so δ is also called the energy gap constant), and α is the defect factor (related to the process of the light-emitting unit. The fewer the defects in the light-emitting unit film layer, the closer the model of the light-emitting unit is to the ideal model, and the closer α is to 1). Based on this, taking the natural logarithm of the above formula (1) can also obtain the following formula (2) which is equivalent to formula (1).

[0123] In(R e )=In(e δ ) / In(I α )=-αIn(I)+δ (2)

[0124] In formula (2), In represents the natural logarithm.

[0125] Based on formula (2), we know that for a light-emitting unit, the natural logarithm of its internal resistance In(R e ) is linearly related to the natural logarithm of the current In(I). That is, the natural logarithm of the internal resistance decreases as the natural logarithm of the current increases.

[0126] For example, Figure 5A According to some embodiments of the present application, the natural logarithm In(R e ) and the natural logarithm of the current In(I).

[0127] exist Figure 5A In the figure, the horizontal axis is the natural logarithm of the current of the light-emitting device In(I), and the vertical axis is the natural logarithm of the internal resistance of the light-emitting device In(R e ),and:

[0128] The first light-emitting device is a single organic light-emitting diode (single OLED), and the structure is: ITO / HAT-CN (5nm) / TAPC (40nm) / TCTA (5nm) / 3TPA-CN (20nm) / TmPyPB (40nm) / LiF (1nm) / Al (120nm) (for details, please refer to the literature: Adv. Optical Mater. 2019, 1801539);

[0129] The second light-emitting device is a near infrared organic light-emitting diode (NIR OLED), the structure of which is: ITO / HATCN (5nm) / TAPC (50nm) / TCTA (5nm) / Alq3: 60wt% DTPS-PT (20nm) / Bphen (55nm) / Liq (2nm) / Al (120nm), and the reference is: Chem. Mater. 2019, 31, 17, 6499–6505;

[0130] The third light-emitting device is a perovskite light emitting diode (PeLED), having a structure of ITO / NiOx / PTAA / PVK / perovskite light-emitting layer / TPBi / LiF / Al, wherein the perovskite light-emitting layer is a two-dimensional CsPbBr3 / Cs4PbBr6 (for details, please refer to the literature: J. Mater. Chem. C, 2021, 9, 916-924);

[0131] The fourth light-emitting device is a polymer light-emitting diode (PLED), having a structure of: ITO / HATCN (5nm) / TAPC (50nm) / TCTA (5nm) / TPB-AC (8nm) / TPB-AC: 5wt% Ir(ppy)2(acac) (3nm) / TPB-AC: 3wt% Ir-(tptpy)2(acac) (2nm) / TPB-AC: 3wt% Ir(dmdpprdmp)2(divm) (9nm) / BmPyPB (40nm) / LiF (1nm) / Al (120nm), (for details, please refer to the literature: ACS Photonics 2019, 6, 767-778);

[0132] The fifth light-emitting device is a solution-processed OLED, and the structure is: ITO / PEDOT:PSS (50nm) / PVK (35nm) / CC6-DBP-PXZ (45nm) / TmPyPB (40nm) / LiF (1nm) / Al (120nm), (for details, please refer to the literature: J. Mater. Chem. C, 2019, 7, 330-339);

[0133] The sixth light-emitting device is a polymer light-emitting diode (PLED), and the structure is: ITO / PEDOT:PSS (50nm) / CBP:5% pTPE-TPA-FL (60nm) / TmPyPB (40nm) / LiF (1nm) / Al (120nm), (for details, please refer to the literature: Mater. Chem. Front., 2020, 4, 1206-1211);

[0134] The seventh light-emitting device is a Tandem OLED, and its structure is: ITO / HAT-CN(10nm) / TAPC(50nm) / TCTA(5nm) / TCTA:Bepp2:Ir(ppy)2(acac)(1:1:8%, 20nm) / Bepp2(30nm) / Liq(1.5nm) / Al(0.5nm) / HAT-CN(10nm) / TAPC(75nm) / TCTA(5nm) / TCTA:Bepp2:Ir(ppy)2(acac)(1:1:8%, 20nm) / Bepp2(30nm) / Liq(1.5nm) / Al(0.5nm) / HAT-CN(5nm) / TAPC(10nm) / Al(100nm); (For details, please refer to the document: Org. Electron, 2020, 83, 105745).

[0135] Depend on Figure 5A It can be seen that the natural logarithm In(R e ) is linearly related to the natural logarithm of the current In(I), and the natural logarithm of the internal resistance In(R e ) decreases linearly with the increase of the natural logarithm of the current In(I).

[0136] Specifically, the natural logarithm In(R e ) and the natural logarithm of the current In(I) satisfy the above formula (2), wherein the natural logarithm of the internal resistance In(R e The curve of ) and the natural logarithm of the current In(I) can be referred to in the following Table 1.

[0137] Table 1 Natural logarithm of internal resistance In(R e ) and its natural logarithm In(I)

[0138]

[0139] In Table 1, the fit R 2The natural logarithm In(R e ) and the natural logarithm of the current In(I) and the corresponding In(R e )-In(I) curve, or the natural logarithm of the internal resistance of the light-emitting device In(R e ) and its natural logarithm In(I e ) is fitted to In(R e )-In(I). The fitting degree R 2 The closer the value is to 1, the smaller the natural logarithm of the internal resistance In(R e ) is more consistent with the natural logarithm of the current In(I)In(R e )-In(I) curve.

[0140] From Table 1 and Figure 5A It can be seen that the natural logarithm of the internal resistance In(R e ) and the natural logarithm of its current In(I) both satisfy the curves defined by the above formulas (1) and (2). It can be seen from formulas (1) and (2) that the resistance and current of the light-emitting device do not conform to Ohm's law. In some embodiments, the relationship between the internal resistance and current of the light-emitting device defined by formulas (1) and (2) can be called the inverse Ohm's law.

[0141] In some embodiments, the light-emitting unit in the light-emitting device emits light when carriers (electrons, holes, etc.) are transferred to the light-emitting layer. During the transmission and light-emitting process of the carriers (electrons, holes, etc.) in the light-emitting layer, there will be transition impedance. Based on formula (1) and formula (2), when there is no defect in the light-emitting unit, α = 1, then the internal resistance of the light-emitting unit can be simplified to R e =e δ / I (equivalent to e δ =R e I), R e It is equivalent to the transition impedance of carriers (electrons, holes, etc.) in the transmission and luminescence process of the light-emitting layer, e δ It is equivalent to the potential barrier between the molecular orbitals of the current carrier transition. δ =R e I, when I is a fixed value, R e When e is a fixed value, δ is also a constant. However, for the same material, under the condition of constant external conditions (such as temperature, pressure, etc.), the potential barrier between different molecular orbitals (equivalent to e δ ) is a constant (energy gap invariance law). Therefore, the above formulas (1) and (2) also conform to the energy gap invariance law.

[0142] In some embodiments, reference Figure 5B For a light-emitting unit in a sub-pixel, the side of the light-emitting unit close to the anode is sequentially provided with HIL, HTL, and electron blocking layer (EBL) (used to block the transmission of electrons, such as the aforementioned auxiliary layer) from far to near, and the side of the light-emitting unit close to the cathode is sequentially provided with HBL, ETL, and EIL from far to near. The current flows from HIL→HTL→ETL→light-emitting unit→HBL→ETL→EIL. Continue to refer to Figure 5B In HIL, HTL, EBL, HBL, ETL, and EIT, each layer has a thin film internal resistance (hereinafter, the sum of the thin film internal resistances of each layer is denoted as R CM ), there is an interfacial resistance between the interfaces of two adjacent layers (hereinafter, the interfacial resistance of each interface is recorded as the sum of the film internal resistance and is recorded as R interface ). Therefore, the equivalent resistance R corresponding to a light-emitting unit in a sub-pixel is 总 Can be R CM , R interface With R e The sum of R 总 =R CM +R interface +R e .

[0143] In some embodiments, when the current density in the light-emitting unit of a sub-pixel is small, R CM , R interface Much smaller than R e , will not affect the equivalent resistance of the light-emitting unit. When the current density in the light-emitting unit of a sub-pixel is large, R e A sharp decrease in R CM , R interface Close to R e Therefore, the internal resistance measured at the cathode and anode ends of the sub-pixel where the light-emitting unit is located will be different from the transition impedance R e Since the current density of the light-emitting unit in the sub-pixel is usually small when it is lit (when the light-emitting brightness increases from 0 to a preset value, such as 0.01 nit (or other values)), the equivalent resistance of a light-emitting unit when it is lit can be ignored. CM , R interface , so R can be calculated based on formula (1) or formula (2) 总 =R e .

[0144] In the following, the area of ​​the light-emitting unit in the red sub-pixel is 20 μm × 20 μm = 400 μm 2 , the natural logarithm of the equivalent resistance of the light-emitting unit In(R e) and the natural logarithm of the current In(I) satisfy Fig. 6A The curve In(Re)=-0.9766×In(I)+1.3607 is used as an example to introduce the technical solution of the present application.

[0145] Combination Fig. 6A , assuming that the lighting current density of a light-emitting unit of the red sub-pixel is 0.0005mA / cm 2 (i.e. the current density in the light-emitting unit is lower than the lighting current density of 0.0005 mA / cm 2 When the light-emitting unit is not emitting light or emitting light weakly, the corresponding current is 0.0005mA / cm 2 ×400μm 2 =2×10 -12 A, then substitute into the above formula "In(Re) = -0.9766×In(2×10 -12 )+1.3607”, the equivalent resistance of the corresponding light-emitting unit is 1038GΩ (equivalent to Figure 2B The resistance of the red light-emitting unit R1-2 is 1038GΩ), which is equivalent to the voltage value at both ends of the light-emitting unit being 1038GΩ×0.0005mA / cm 2 ×400μm 2 =2.08V (equivalent to Figure 2B The voltage across the red light-emitting unit R1-2 in the example is 2.08V).

[0146] Assume that the voltage of the blue light-emitting unit in the blue sub-pixel is 2.4V (equivalent to Figure 2B The voltage across the blue light-emitting unit B1-1 / B1-2 is 2.4V, that is, V CGL -ELVSS=2.4V), then the red light emitting unit R1-2 is CGL The partial pressure R R1-2 / (R R1-2 +R CGL )×(V CGL -ELVSS)=2.08V, i.e. 1038GΩ / (1038GΩ+R CGL )×2.4V=2.08V. At 1038GΩ / (1038GΩ+R CGL )×2.4V=2.08V, when the current density in the red light-emitting unit R1-2 reaches the lighting current density, R CGL =1038GΩ×2.4V / 2.08V-1038GΩ / =159.7GΩ. Reference Figure 6B, the current density of the light-emitting unit in the red sub-pixel increases with the increase of the driving voltage. If the equivalent resistance of CGL is greater than 159.7GΩ, the voltage across the red light-emitting unit R1-2 will be less than 2.08V, and the current density in the red light-emitting unit R1-2 will be less than 0.0005mA / cm 2 , the red light-emitting unit R1-2 does not emit light. That is to say, when the PDL gap is 20μm, if the equivalent resistance of the CGL is greater than 159.7GΩ / □, the current density in the red light-emitting unit R1-2 will be less than 0.0005mA / cm 2 (The lighting current density of the red light emitting unit R1 - 2 is not reached). Thus, pixel crosstalk between the blue sub-pixel and the red sub-pixel will not occur.

[0147] In some embodiments, the driving voltage of the blue sub-pixel is greater than the driving voltage of the green sub-pixel, and the driving voltage of the green sub-pixel is greater than the driving voltage of the red sub-pixel. Therefore, the voltage division obtained by each sub-pixel from the driving voltage of the sub-pixel of other colors other than the blue sub-pixel will be less than the voltage division obtained from the driving voltage of the blue sub-pixel. In other words, when there is no pixel crosstalk between the blue sub-pixel and the red sub-pixel, there will be no pixel crosstalk between the green sub-pixel and the red sub-pixel, and between the blue sub-pixel and the red sub-pixel.

[0148] In some embodiments, under the condition that other conditions are constant, the sheet resistance of the film increases as the thickness decreases. Therefore, by reducing the thickness of the i-CGL, the overall sheet resistance of the CGL can be increased, so that the voltage value obtained by the light-emitting unit in one sub-pixel from the driving voltage of another sub-pixel is smaller than the light-emitting voltage of the light-emitting unit, thereby avoiding crosstalk between sub-pixels. For example, for Fig. 6A and Figure 6B In the situation shown, the thickness of the i-CGL can be reduced to make the square resistance of the CGL greater than 159.7 GΩ / □, so that the red light-emitting unit R1-2 will not emit light incorrectly due to the blue light-emitting unit B1-1 / B1-2.

[0149] For example, Figure 7 According to some embodiments of the present application, a schematic diagram of a curve of the current and the driving voltage of the CGL when the thickness of the i-CGL is different is shown.

[0150] Figure 7 In the case shown, the horizontal axis represents the driving voltage, the vertical axis represents the current, and:

[0151] The first CGL is: ITO / ET: 1.5% Yb (10nm) / HATCN (2.5nm) / HT: 3% NDP-9 (10nm) / ITO, which is a stacked structure of indium tin oxide electrode, N-CGL (10nm thick and made of 1.5% Yb doped in electron transport material), i-CGL (2.5nm thick and made of HATCN), P-CGL (10nm thick and made of 3% NDP-9 doped in hole transport material), and indium tin oxide electrode. For details, please refer to the literature (SID 2022DIGEST, 877-880).

[0152] The second CGL is: ITO / ET: 1.5% Yb (10nm) / HATCN (5nm) / HT: 3% NDP-9 (10nm) / ITO, which is a stacked structure of indium tin oxide electrode, N-CGL (10nm thick and made of 1.5% Yb doped in electron transport material), i-CGL (2.5nm thick and made of HATCN), P-CGL (10nm thick and made of 3% NDP-9 doped in hole transport material), and indium tin oxide electrode. For details, please refer to the literature (SID 2022DIGEST, 877-880).

[0153] That is, the difference between the first CGL and the second CGL is that the thickness of the i-CGL is different.

[0154] like Figure 7 As shown in Figure 2, the current of the first CGL remains constant at 10 as the driving voltage increases. -8 mA, and the current of the first CGL increases from 10 -8 mA order of magnitude increased to 10 -6 mA order of magnitude. For example, when the driving voltage is 20 V, the current in the first CGL is 2.903×10 -8 mA, CGL square resistance is 20V / 2.903×10 -8 mA=688.9GΩ / □. When the driving voltage is 20V, the current in the second CGL is 7.094×10 -6 mA, square resistance is 20V / 7.094×10 -6 mA = 2.8 GΩ / □. The square resistance of the first CGL is 244 times that of the second CGL.

[0155] In some embodiments, due to the specific charge generation capability of the i-CGL, under the condition of providing the same charge generation capability, the doping concentration of the P-CGL in the three-layer CGL is lower than the doping concentration of the two-layer P-CGL, and the doping concentration of the N-CGL in the three-layer CGL is lower than the doping concentration of the two-layer N-CGL. Accordingly, the square resistance of the three-layer CGL will be greater than the square resistance of the two-layer CGL. Therefore, the three-layer CGL including the N-CGL, the i-CGL and the P-CGL provided by the embodiment of the present application is more conducive to increasing the square resistance of the CGL.

[0156] For example, Fig. 8A According to some embodiments of the present application, a schematic diagram of a curve showing a change in current density of a light-emitting layer in a display panel using two layers of CGL and three layers of CGL as a function of a driving voltage is shown; Figure 8B According to some embodiments of the present application, a schematic diagram of a curve showing a change in the luminance of a light-emitting unit in a display panel using two layers of CGL and three layers of CGL as a function of a driving voltage is shown; Figure 8C According to some embodiments of the present application, a schematic diagram comparing currents in a two-layer CGL and a three-layer CGL is shown.

[0157] exist FIG. 8A to FIG. 8C In the scenario shown:

[0158] The structure of the two-layer CGL is ET: 1.5% Yb (10nm) / HT: 10% NDP-9 (10nm), that is, the thickness of the N-CGL is 10nm and is prepared by doping 1.5% Yb in the electron transport material, and the thickness of the P-CGL is 10nm and is prepared by doping 10% NDP-9 in the hole transport material. For details, please refer to the literature (SID 2022DIGEST, 877-880).

[0159] The structure of the three-layer CGL is ET: 1.5% Yb (10nm) / HATCN (2.5nm) / HT: 3% NDP-9 (10nm), that is, the N-CGL is 10nm thick and is made of 1.5% Yb doped in the electron transport material, the i-CGL is 2.5nm thick and uses HATCN, and the P-CGL is 10nm thick and is made of 3% NDP-9 doped in the hole transport material. Compared with the two-layer CGL, the doping concentration of the P-CGL in the three-layer CGL is reduced from 10% to 3%. For details, please refer to the literature (SID 2022DIGEST, 877-880).

[0160] Referring to 8A, the current density in the light-emitting layer of the display panel using two layers of CGL and three layers of CGL increases with the increase of driving voltage. However, under the same driving voltage, the current density in the light-emitting layer of the display panel using three layers of CGL is higher than the current density of CGL in the display panel using two layers of CGL. Since under the same voltage, the higher the current density provided by CGL to the light-emitting layer, the stronger the charge generation ability of CGL, it can be seen that the charge generation ability of three layers of CGL is higher than that of two layers of CGL.

[0161] refer to Figure 8B , the luminous brightness of the light-emitting unit in the display panel using two layers of CGL and three layers of CGL increases with the increase of driving voltage. Under the same driving voltage, the luminous brightness of the CGL in the display panel using three layers of CGL is higher than the luminous brightness of the CGL in the display panel using two layers of CGL. When the light-emitting unit reaches the same brightness, the driving voltage required for the display panel using three layers of CGL is lower than the driving voltage required for the display panel using two layers of CGL. In this way, the display panel provided by the embodiment of the present application can reduce power consumption.

[0162] refer to Figure 8C , the current of the two-layer CGL and the three-layer CGL both increase with the increase of the driving voltage, but the rate of increase of the current of the three-layer CGL with the driving voltage (the greater the slope of the curve, the greater the rate of increase) is much lower than the rate of increase of the current of the two-layer CGL with the driving voltage. Moreover, under the same driving voltage, the current in the three-layer CGL is much lower than the current in the two-layer CGL. Since the square resistance is inversely proportional to the current under a certain voltage, the square resistance of the three-layer CGL is greater than that of the two-layer CGL. For example, under the driving voltage of 20V, the current in the three-layer CGL is 7.21×10 -9 mA, CGL square resistance is 20V / 7.21×10 -9 mA=2774GΩ / □; the current in the two-layer CGL is 6.508×10 -8 mA, CGL square resistance is 20V / 6.508×10 -8 mA = 305 GΩ / □ That is, by using a three-layer CGL, when the driving voltage is 20V, the square resistance of the three-layer CGL is about (2774-305) / 305 = 8.1 times greater than that of the two-layer CGL.

[0163] In some embodiments, the Fermi level of the i-CGL is lower than that of the host material in the P-CGL, and an accumulation junction is formed between the i-CGL and the P-CGL, so that electrons tunnel from the P-CGL to the i-CGL, thereby reducing the energy level transition barrier. In this way, the driving voltage of the display panel can be reduced, thereby reducing the power consumption of the display panel. The following describes the specific principle of reducing the driving voltage of the display panel when the Fermi level of the i-CGL is lower than that of the P-CGL.

[0164] For example, Fig. 9A shows a schematic diagram of energy levels of a two-layer CGL; Fig. 9B A schematic diagram of the electric field of a two-layer CGL is shown.

[0165] like Fig. 9A As shown in the figure, in the two-layer CGL, the Fermi level of the material used to transport electrons (N-ET) in the N-CGL is close to the material used to transport holes (P-HT) in the P-CGL, and the Fermi level of N-ET is higher than that of P-HT. Electrons will diffuse from the N-CGL to the P-CGL, resulting in a decrease in the number of electrons on the side of the N-CGL close to the P-CGL and an increase in the proportion of holes, and an increase in the number of electrons on the side of the P-CGL close to the N-CGL and a decrease in the proportion of holes. In this way, refer to Fig. 9B A depletion region is formed in the area close to the N-CGL and the P-CGL. In the depletion region, there is a built-in electric field E1 pointing from the N-CGL to the P-CGL. In the area other than the depletion region in the N-CGL and in the area other than the depletion region in the P-CGL, there are built-in electric fields E2 and E3 in the opposite direction to the built-in electric field E1, respectively.

[0166] After applying a driving voltage to the two layers of CGL, there will be an external electric field E0 directed from N-CGL to P-CGL to drive the holes generated at the interface of N-CGL and P-CGL to move in the direction of the external electric field E0, and the electrons generated at the interface of N-CGL and P-CGL to move in the direction opposite to the external electric field E0. Since the direction of the external electric field E0 is opposite to the directions of the built-in electric field E2 and the built-in electric field E3, the built-in electric field E2 and the built-in electric field E3 will hinder the holes and electrons from moving in the corresponding directions. In other words, in addition to providing the voltage for the migration of holes and electrons, the external electric field E0 also needs to provide a voltage to overcome the built-in electric field E2 and the built-in electric field E3. Therefore, as the working time of the display panel increases, the intensity of the built-in electric field E1 will become stronger and stronger, and correspondingly the built-in electric field E2 and the built-in electric field E3 will also continue to increase. The voltage in the driving voltage used to overcome the built-in electric field E2 and the built-in electric field E3 will also increase, and the driving voltage required to drive the display panel to emit light of the same brightness will also become stronger and stronger.

[0167] In the three-layer CGL, the Fermi level of i-CGL is lower than that of P-CGL, and an accumulation junction is formed between i-CGL and P-CGL, which can reduce the driving voltage compared to the double-layer CGL.

[0168] Specifically, Fig. 10A shows a schematic diagram of energy levels of a three-layer CGL; Fig. 10B A schematic diagram of the built-in electric field direction of a three-layer CGL is shown.

[0169] like Fig. 10A As shown in Figure 1, in the three-layer CGL, the Fermi level of i-CGL is lower than that of P-HT and N-ET. Therefore, in the absence of an external electric field, the electrons in P-CGL will migrate to i-CGL, resulting in an increase in the number of electrons on the side of i-CGL close to P-CGL and a decrease in the proportion of holes, and a decrease in the number of electrons on the side of P-CGL close to i-CGL and an increase in the proportion of holes. Fig. 10B An accumulation junction is formed near the interface between the i-CGL and the P-CGL, and a built-in electric field E4 pointing from the P-CGL to the i-CGL exists in the accumulation junction. Accordingly, a built-in electric field E5 and a built-in electric field E6 in the same direction as the built-in electric field E4 exist in the region other than the accumulation junction in the i-CGL and in the region other than the depletion region in the P-CGL, respectively.

[0170] After applying a driving voltage to the three-layer CGL, there will be an external electric field E0 directed from N-CGL to P-CGL to drive the holes generated by i-CGL (it can also be N-CGL or P-CGL) to move in the direction of the external electric field E0, and the electrons generated at the interface of N-CGL and P-CGL to move in the opposite direction of the external electric field E0. Since the direction of the external electric field E0 is the same as the direction of the built-in electric field E5 and the built-in electric field E6, the built-in electric field E5 and the built-in electric field E6 will not hinder the holes and electrons from moving in the corresponding directions. In other words, the external electric field E0 does not need to provide a voltage to overcome the built-in electric field E5 and the built-in electric field E6, and compared with two layers of CGL, the driving voltage required to drive the display panel to emit light of the same brightness will not increase.

[0171] Next, the structure of the display panel including the aforementioned three-layer CGL provided in the embodiment of the present application is introduced in combination with a specific pixel composition method.

[0172] In some embodiments, a pixel may include sub-pixels of multiple colors, for example, sub-pixels of three colors, such as red sub-pixels, green sub-pixels, and blue sub-pixels, or sub-pixels of four colors, such as red sub-pixels, green sub-pixels, blue sub-pixels, and cyan sub-pixels, or sub-pixels of four colors, such as red sub-pixels, green sub-pixels, blue sub-pixels, and azure sub-pixels, or sub-pixels of four colors, such as red sub-pixels, green sub-pixels, blue sub-pixels, and white sub-pixels. A sub-pixel of one color may be referred to as a primary color, and the display panel may mix multiple primary colors into different colors by changing the luminous brightness of different primary colors in the same pixel.

[0173] In some embodiments, in a pixel, the number of sub-pixels of one color may be one or more. For example, in the case where a pixel includes sub-pixels of three colors, the pixel may include three sub-pixels of different colors, and in the case where a pixel includes sub-pixels of four colors, the pixel may include four sub-pixels of different colors. For another example, in the case where a pixel includes sub-pixels of three colors, the pixel may include four sub-pixels, and two of the four sub-pixels have the same color.

[0174] In some embodiments, the shape of the light emitting unit of a sub-pixel may be circular, elliptical, rectangular, diamond, or other polygonal or irregular shapes.

[0175] In some embodiments, the colors of the multiple light-emitting units of a sub-pixel of a color may be the same or different. For example, a sub-pixel of a color may include multiple light-emitting units of the same color and arranged in different light-emitting layers. For another example, the light-emitting units of a sub-pixel of a color may also include multiple light-emitting units of different light-emitting colors and arranged in different light-emitting layers.

[0176] In some embodiments, the sizes of sub-pixels of different colors may be the same or different.

[0177] Taking a display panel including two light-emitting layers as an example, the technical solution of a display panel including the aforementioned three-layer CGL provided by the present application is introduced in combination with the number, color, shape, and arrangement rules of sub-pixels in a pixel.

[0178] Embodiment 1: A pixel in the display panel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and each sub-pixel includes a plurality of light-emitting units that emit the same color as the sub-pixel.

[0179] For example, Fig.11A According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel 20 is shown.

[0180] like Fig.11A As shown, the CGL in the display panel 20 is the aforementioned three-layer CGL. Specifically, the display panel 20 includes a substrate 201, a driving layer 202, an anode layer 203, a HIL 204, a HTL 205, a light-emitting layer 206, a HBL 207, an ETL 208, an N-CGL 209, an i-CGL 210, a P-CGL 211, a HTL 212, a light-emitting layer 213, a HBL 214, an ETL 215, an EIL 216, a cathode 217, a CPL 218, and an encapsulation layer 219, which are sequentially stacked along the Z direction. Among them, the HBL 207 and the HBL 214 are optional, and the functions and materials of each layer can refer to the relevant contents in the aforementioned display panel 10, and are not limited here.

[0181] For the red sub-pixel, the light-emitting layer 206 may include a stacked auxiliary layer AR1 and a red light-emitting unit R1, wherein the auxiliary layer AR1 is disposed on a side of the light-emitting layer 1 close to the HTL 205, and the light-emitting layer 213 may include a stacked auxiliary layer AR2 and a red light-emitting unit R2, wherein the auxiliary layer AR2 is disposed on a side of the light-emitting layer 213 close to the HTL 212.

[0182] For the green sub-pixel, the light-emitting layer 206 may include a stacked auxiliary layer AG1 and a green light-emitting unit G1, wherein the auxiliary layer AG1 is disposed on a side of the light-emitting layer 206 close to the HTL 205, and the light-emitting layer 213 may include a stacked auxiliary layer AG2 and a green light-emitting unit G2, wherein the auxiliary layer AG2 is disposed on a side of the light-emitting layer 213 close to the HTL 212.

[0183] For a blue sub-pixel, the light-emitting layer 206 may include a blue light-emitting unit B1 , and the light-emitting layer 213 may include a blue light-emitting unit B2 .

[0184] In some embodiments, the light-emitting units of the same color in a light-emitting layer can be prepared by a fine metal mask (FMM), wherein the FMM may include multiple openings, and the size and position of the openings correspond to the size and position of the light-emitting unit. In some embodiments, the auxiliary layer of the same color in a light-emitting layer can be prepared by a FMM, wherein the FMM may include multiple openings, and the position of the openings corresponds to the size and position of the light-emitting unit. Based on this, for Fig.11AThe display panel 20 shown can be prepared with 10 FMMs to prepare the light-emitting layer, which are three FMMs corresponding to the light-emitting units of three colors in the light-emitting layer 206, two FMMs corresponding to the auxiliary layer AR1 and the auxiliary layer AG1 in the light-emitting layer 206, three FMMs corresponding to the light-emitting units of three colors in the light-emitting layer 213, and two FMMs corresponding to the auxiliary layer AR2 and the auxiliary layer AG2 in the light-emitting layer 213.

[0185] That is to say, Fig.11A In the display panel 20 shown, auxiliary layers are arranged between the light-emitting units in each light-emitting layer and the hole transport layers adjacent to the light-emitting layers for red sub-pixels and green sub-pixels, while no auxiliary layer is arranged between the light-emitting units in each light-emitting layer and the hole transport layers adjacent to the light-emitting layers for blue sub-pixels.

[0186] It should be noted that in other embodiments, according to different manufacturing processes and different requirements for the display panel's luminescence (such as luminous brightness, color gamut, luminous efficiency, etc.), the corresponding auxiliary layers may be increased or decreased, and the number of FMMs required to prepare the luminous layer may be increased or decreased accordingly.

[0187] For example, refer to Fig. 11B Compared with the display panel 20, the red sub-pixel and the green sub-pixel in the display panel 20' do not have an auxiliary layer between the light emitting unit R1 and the light emitting unit G1 in the light emitting layer 206 and the HTL 205. Therefore, only 8 FMMs can be used when preparing the light emitting unit in the display panel 20'.

[0188] It should be noted that Fig.11A and Fig. 11B The fact that no auxiliary layer is provided between the light-emitting unit of the blue sub-pixel and the adjacent HTL is only an example. In other embodiments, no auxiliary layer may be provided between the light-emitting units of sub-pixels of other one or more colors and the adjacent HTL, or an auxiliary layer may be provided between the light-emitting units of sub-pixels of all colors and the adjacent HTL. This is not limited here.

[0189] For example, in some embodiments, an auxiliary layer may be provided between the light-emitting units of the red sub-pixel and the blue sub-pixel in the light-emitting layer 206 and the HTL 205, and an auxiliary layer may be provided between the light-emitting units of the red sub-pixel and the blue sub-pixel in the light-emitting layer 213 and the HTL 212, but no auxiliary layer may be provided between the light-emitting unit of the green sub-pixel and the adjacent HTL.

[0190] For another example, in some embodiments, an auxiliary layer may be provided between the light-emitting units of the green sub-pixel and the blue sub-pixel in the light-emitting layer 206 and the HTL 205, and an auxiliary layer may be provided between the light-emitting units of the green sub-pixel and the blue sub-pixel in the light-emitting layer 213 and the HTL 212, but no auxiliary layer may be provided between the light-emitting unit of the red sub-pixel and the adjacent HTL.

[0191] Corresponds to Fig.11A and Fig. 11B In the case shown, the shape, arrangement order and number of sub-pixels can adopt a variety of different settings.

[0192] For example, FIG. 12A to FIG. 12F Schematic diagram showing various sub-pixel arrangements.

[0193] For example, reference Fig. 12A , a pixel may include 3 rectangular sub-pixels, namely red sub-pixels, green sub-pixels and blue sub-pixels. In each pixel, the red sub-pixels, green sub-pixels and blue sub-pixels are distributed in the same manner, and the red sub-pixels, green sub-pixels and blue sub-pixels may be arranged in sequence along the X direction in the order of red sub-pixels, green sub-pixels and blue sub-pixels. In other words, a pixel may include 3 columns of sub-pixels, and sub-pixels of each color occupy one column.

[0194] Optionally, in some embodiments, in each pixel, the red sub-pixel, the green sub-pixel and the blue sub-pixel may also be arranged sequentially along the Y direction, that is, one pixel may include 3 rows of sub-pixels, and the sub-pixels of each color occupy one row.

[0195] Optionally, in some embodiments, in each pixel, the red sub-pixel, the green sub-pixel, and the blue sub-pixel may also be arranged sequentially along the X direction or the Y direction in the order of green sub-pixel, blue sub-pixel, red sub-pixel, or the order of green sub-pixel, red sub-pixel, blue sub-pixel, or the order of red sub-pixel, blue sub-pixel, green sub-pixel, or the order of blue sub-pixel, red sub-pixel, green sub-pixel, or the order of blue sub-pixel, green sub-pixel, red sub-pixel.

[0196] Optionally, the sizes of the three rectangular sub-pixels in one pixel may be the same or different.

[0197] For example, reference Fig. 12B, a sub-pixel can include 3 rectangular sub-pixels, namely red sub-pixels, green sub-pixels and blue sub-pixels. In each pixel, the red sub-pixels, green sub-pixels and blue sub-pixels are distributed in the same way, and the green sub-pixels and red sub-pixels are arranged in sequence in the Y direction (equivalent to the green sub-pixels and red sub-pixels being arranged in one column), and the blue sub-pixels and red sub-pixels are arranged in sequence along the X direction (equivalent to the blue sub-pixels and red sub-pixels (green sub-pixels) being arranged in different columns). That is to say, a pixel includes 2 columns of pixels, the red sub-pixels and green sub-pixels are arranged in one column, and the blue sub-pixels are arranged in another column.

[0198] Alternatively, in some embodiments, in each pixel, the positions of the red sub-pixel and the green sub-pixel may be swapped.

[0199] Optionally, in some embodiments, any two sub-pixels of three colors may be located in the same column, while the sub-pixel of another color may be located in another column.

[0200] For example, reference Fig. 12C , a pixel can include 3 rectangular sub-pixels, namely red sub-pixels, green sub-pixels and blue sub-pixels. In each pixel, the red sub-pixels and green sub-pixels are distributed in the same way, and the green sub-pixels and red sub-pixels are arranged in sequence along the Y direction (equivalent to the green sub-pixels and red sub-pixels being arranged in one column), and the blue sub-pixels and red sub-pixels are arranged in sequence along the X direction (equivalent to the blue sub-pixels and red sub-pixels (green sub-pixels) being arranged in different columns). In addition, the blue sub-pixels in two pixels adjacent to each other in the Y direction (i.e., two pixels adjacent to each other in the same column) are respectively close to different sides of their respective pixels in the Y direction; the positions of the blue sub-pixels relative to the pixels in the same row of pixels are the same. For example, pixel P2 and pixel P4 are adjacent to each other in the Y direction, the blue sub-pixel in pixel P2 is close to the lower edge of pixel P2, and the blue sub-pixel in pixel P4 is close to the upper edge of pixel P4. For another example, pixel P2 and pixel P3 are in the same row, the blue sub-pixel in pixel P2 is close to the bottom edge of pixel P2, and the blue sub-pixel in pixel P3 is close to the bottom edge of pixel P3; pixel P4 and pixel P5 are in the same row, the blue sub-pixel in pixel P4 is close to the top edge of pixel P4, and the blue sub-pixel in pixel P5 is close to the top edge of pixel P5.

[0201] Since the light-emitting unit is prepared by FMM, the size of the opening in the FMM corresponds to the size of the light-emitting unit. Fig. 12CIn the sub-pixel arrangement shown in the figure, when preparing the light-emitting unit of the blue sub-pixel, the blue sub-pixel in two pixels adjacent in the Y direction and close to the boundary between the two pixels can be prepared by one opening. That is to say, in the FMM corresponding to the blue sub-pixel, the size of the opening is greater than or equal to the sum of the sizes of the two blue sub-pixels. In this way, it is possible to avoid manufacturing a small opening in the FMM, reducing the manufacturing cost. For example, for Fig. 12C In the pixels P2 to P5, the blue sub-pixels in pixel P2 and pixel P3 are close to the boundary between pixel P2 and pixel P4, and the blue sub-pixels in pixel P2 and pixel P4 can be prepared through the opening K1 in the FMM; the blue sub-pixels in pixel P3 and pixel P5 are close to the boundary between pixel P3 and pixel P5, and the blue sub-pixels in pixel P3 and pixel P5 can be prepared through the opening K2 in the FMM.

[0202] In some embodiments, for Fig. 12C The sub-pixel arrangement shown can also exchange the positions of sub-pixels of different colors in the display panel. For example, the position of the red sub-pixel in the display panel is exchanged with the position of the blue sub-pixel, and / or the position of the red sub-pixel in the display panel is exchanged with the position of the green sub-pixel, and / or the position of the blue sub-pixel in the display panel is exchanged with the position of the green sub-pixel, and the position of the blue sub-pixel in the display panel is exchanged with the position of the green sub-pixel, which is not limited here.

[0203] refer to Fig.12D In some embodiments, a sub-pixel may include three rectangular sub-pixels, namely a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In each pixel, the green sub-pixel and the red sub-pixel are arranged along the Y direction (equivalent to the green sub-pixel and the red sub-pixel being arranged in one column), and the blue sub-pixel and the red sub-pixel are arranged along the X direction (equivalent to the blue sub-pixel and the red sub-pixel (green sub-pixel) being arranged in different columns). Among them, in two adjacent pixels in the same column, the arrangement of the sub-pixels is mirrored around the X direction; the arrangement of the sub-pixels in the pixels in the same row is the same. That is to say, in two adjacent pixels in the same column, the arrangement order of the red sub-pixels and the green sub-pixels along the Y direction is opposite, and the blue sub-pixels are close to different sides of their respective pixels in the Y direction.

[0204] For example, pixel P6 and pixel P8 are adjacent pixels in the same column, the red sub-pixel in pixel P6 is above the red sub-pixel, and the blue sub-pixel is close to the bottom edge of pixel P6; the green sub-pixel in pixel P8 is above the red sub-pixel, and the blue sub-pixel is close to the top edge of pixel P8. For another example, pixel P6 and pixel P7 are pixels in the same row, and the sub-pixels are arranged in the same manner.

[0205] based on Fig.12DIn the sub-pixel arrangement shown, except for the sub-pixels in the edge area of ​​the display panel, each sub-pixel is close to another sub-pixel of the same color in the Y direction. Therefore, the openings of the FMM for manufacturing red sub-pixels, green sub-pixels, and blue sub-pixels can be larger than 2 times the size of the red sub-pixel, larger than 2 times the size of the green sub-pixel, and larger than 2 times the size of the blue sub-pixel, respectively. In this way, it is possible to avoid manufacturing smaller openings in the FMM, reducing manufacturing costs.

[0206] For example, for Fig.12D For pixels P6 to P9 in the FMM, the blue sub-pixels in pixel P6 and pixel P8 are close to the boundary between pixel P6 and pixel P8, and the blue sub-pixels in pixel P6 and pixel P8 can be prepared through opening K3 in the FMM; the blue sub-pixels in pixel P7 and pixel P9 are close to the boundary between pixel P7 and pixel P9, and the blue sub-pixels in pixel P7 and pixel P9 can be prepared through opening K4 in the FMM. Similarly, the green sub-pixels in pixel P6 and pixel P8 can be prepared through opening K5 in the FMM; the green sub-pixels in pixel P7 and pixel P9 can be prepared through opening K6 in the FMM.

[0207] In some embodiments, for Fig.12D The sub-pixel arrangement shown can also exchange the positions of sub-pixels of different colors in the display panel. For example, the position of the red sub-pixel in the display panel is exchanged with the position of the blue sub-pixel, and / or the position of the red sub-pixel in the display panel is exchanged with the position of the green sub-pixel, and / or the position of the blue sub-pixel in the display panel is exchanged with the position of the green sub-pixel, and the position of the blue sub-pixel in the display panel is exchanged with the position of the green sub-pixel, which is not limited here.

[0208] refer to Fig.12E In some embodiments, a sub-pixel may include three rectangular sub-pixels, namely a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In each pixel, the green sub-pixel and the red sub-pixel are arranged along the Y direction (equivalent to the green sub-pixel and the red sub-pixel being arranged in one column), and the blue sub-pixel and the red sub-pixel are arranged along the X direction (equivalent to the blue sub-pixel and the red sub-pixel (green sub-pixel) being arranged in different columns). Among them, in two adjacent pixels, the arrangement of the sub-pixels is mirrored around the X direction. That is to say, in two adjacent pixels, the arrangement order of the red sub-pixels and the green sub-pixels along the Y direction is opposite, and the blue sub-pixels are close to different sides of their respective pixels in the Y direction.

[0209] For example, in pixel P10, the red sub-pixel is above the green sub-pixel, and the blue sub-pixel is close to the bottom edge of pixel P10. Pixel P10 is adjacent to pixel P11 and pixel P12 respectively, so in pixel P11 and pixel P12, the green sub-pixel is above the red sub-pixel, and the blue sub-pixel is close to the top edge of pixel P10.

[0210] based on Fig.12E In the sub-pixel arrangement shown in the figure, except for the sub-pixels in the edge area of ​​the display panel, each sub-pixel is close to another sub-pixel of the same color in the Y direction. Therefore, the openings of the FMM for manufacturing red sub-pixels, green sub-pixels, and blue sub-pixels can be larger than 2 times the size of the red sub-pixel, larger than 2 times the size of the green sub-pixel, and larger than 2 times the size of the blue sub-pixel, respectively. In this way, it is possible to avoid manufacturing smaller openings in the FMM, thereby reducing the manufacturing cost. For example, for Fig.12E In the pixels P10 to P13, the blue sub-pixel in the pixel P10 and the pixel P12 is close to the boundary between the pixel P10 and the pixel P12, and the blue sub-pixel in the pixel P10 and the blue sub-pixel in the pixel P12 can be prepared through the opening K7 in the FMM; the green sub-pixel in the pixel P10 and the pixel P12 is close to the boundary between the pixel P10 and the pixel P12, and the blue sub-pixel in the pixel P10 and the green sub-pixel in the pixel P12 can be prepared through the opening K8 in the FMM; the red sub-pixel in the pixel P11 and the pixel P13 is close to the boundary between the pixel P11 and the pixel P13, and the red sub-pixel in the pixel P11 and the red sub-pixel in the pixel P13 can be prepared through the opening K9 in the FMM.

[0211] In some embodiments, for Fig.12E The sub-pixel arrangement shown can also exchange the positions of sub-pixels of different colors in the display panel. For example, the position of the red sub-pixel in the display panel is exchanged with the position of the blue sub-pixel, and / or the position of the red sub-pixel in the display panel is exchanged with the position of the green sub-pixel, and / or the position of the blue sub-pixel in the display panel is exchanged with the position of the green sub-pixel, and the position of the blue sub-pixel in the display panel is exchanged with the position of the green sub-pixel, which is not limited here.

[0212] In some embodiments, due to FIG. 12C to FIG. 12E In the sub-pixel arrangement shown, at least some of the sub-pixels can be prepared by FMMs with an opening size that is twice (or more) the size of the sub-pixels. When the minimum opening size of the FMM is constant, a display panel with a smaller pixel size and a higher pixel density can be prepared. FIG. 12C to FIG. 12E The sub-pixel arrangement shown may be used for display panels with a higher pixel density and / or a smaller pixel size.

[0213] refer to Fig.12FIn some embodiments, a sub-pixel may include four rectangular sub-pixels, namely, one red sub-pixel, two green sub-pixels, and one blue sub-pixel. In each pixel, the red sub-pixel and the blue sub-pixel are respectively arranged at two corners on one diagonal line of the pixel, and the two green sub-pixels are respectively arranged at two corners on another diagonal line of the pixel.

[0214] Optionally, for Fig.12F In the sub-pixel arrangement shown, the green sub-pixel may be a rectangle, and the red sub-pixel and the blue sub-pixel may be a square.

[0215] In some embodiments, for the sub-pixel arrangement shown in FIG. 12 , the positions of sub-pixels of different colors in the display panel may also be swapped. For example, the position of the red sub-pixel in the display panel may be swapped with the position of the blue sub-pixel, or the position of the red sub-pixel may be swapped with the position of the green sub-pixel, or the position of the green sub-pixel may be swapped with the position of the blue sub-pixel, etc.

[0216] It should be noted that FIG. 12A to FIG. 12F The rectangular shape of the sub-pixel is only an example. In other embodiments, without changing the arrangement of sub-pixels of different colors, the shape of the sub-pixel can be other shapes, such as circle, ellipse, other polygonal or irregular shapes, etc., which is not limited to the embodiments of the present application.

[0217] It should be noted that FIG. 12A to FIG. 12F The sub-pixel color is only an example. In other embodiments, sub-pixels of other colors may be used to replace one or more of the red sub-pixels, blue sub-pixels, and green sub-pixels. This embodiment of the present application is not limited to this.

[0218] Embodiment 2: A pixel in the display panel includes a red sub-pixel, a green sub-pixel, a blue sub-pixel and a cyan sub-pixel, and each sub-pixel includes a plurality of light-emitting units having the same light-emitting color as the sub-pixel.

[0219] For example, Fig.13A According to some embodiments of the present application, a schematic structural diagram of sub-pixels of different colors in a display panel is shown.

[0220] like Fig.13AAs shown, the CGL in the display panel 30 is the aforementioned three-layer CGL. Specifically, the display panel 30 includes a substrate 301, a driving layer 302, an anode 303, a HIL 304, a HTL 305, a light-emitting layer 306, a HBL 307, an ETL 308, an N-CGL 309, an i-CGL 310, a P-CGL 311, a HTL 312, a light-emitting layer 313, a HBL 314, an ETL 315, an EIL 316, a cathode 317, a CPL 318, and an encapsulation layer 319, which are sequentially stacked along the Z direction. Among them, the HBL 307 and the HBL 314 are optional, and the functions and materials of each layer can refer to the relevant contents in the aforementioned display panel 10, and are not limited here.

[0221] For the red sub-pixel, the light-emitting layer 306 may include an auxiliary layer AR1 and a red light-emitting unit R1 stacked in sequence, and the light-emitting layer 313 may include an auxiliary layer AR2 and a red light-emitting unit R2 stacked in sequence, wherein the auxiliary layer AR1 is arranged on a side of the light-emitting layer 306 close to the HTL 305, and the auxiliary layer AR2 is arranged on a side of the light-emitting layer 313 close to the HTL 312.

[0222] For the green sub-pixel, the light-emitting layer 306 may include an auxiliary layer AG1 and a green light-emitting unit G1 stacked in sequence, and the light-emitting layer 313 may include an auxiliary layer AG2 and a green light-emitting unit G2 stacked in sequence, wherein the auxiliary layer AG1 is arranged on the side of the light-emitting layer 306 close to the HTL 305, and the auxiliary layer AG2 is arranged on the side of the light-emitting layer 313 close to the HTL 312.

[0223] For the azure sub-pixel, the light-emitting layer 306 may include an auxiliary layer AC1 and a cyan light-emitting unit C1 stacked in sequence, and the light-emitting layer 313 may include an auxiliary layer AC2 and a cyan light-emitting unit C2 stacked in sequence, wherein the auxiliary layer AC1 is arranged on the side of the light-emitting layer 306 close to the HTL 305, and the auxiliary layer AC2 is arranged on the side of the light-emitting layer 313 close to the HTL 312.

[0224] For a blue sub-pixel, the light-emitting layer 306 may include a blue light-emitting unit B1 , and the light-emitting layer 313 may include a blue light-emitting unit B2 .

[0225] for Fig.13A The display panel shown can be prepared with 11 FMMs to prepare the light-emitting layer, including four FMMs corresponding to the light-emitting units of four colors in the light-emitting layer 306, three FMMs corresponding to the auxiliary layer AR1, auxiliary layer AG1 and auxiliary layer AC1 in the light-emitting layer 313, and four FMMs corresponding to the light-emitting units of four colors in the light-emitting layer 2.

[0226] That is to say, Fig.13AIn the display panel 30 shown, an auxiliary layer is arranged between the light-emitting unit in the light-emitting layer of the red sub-pixel, the green sub-pixel and the cyan sub-pixel and the hole transport layer adjacent to the light-emitting layer, while no auxiliary layer is arranged between the light-emitting unit in each light-emitting layer of the blue sub-pixel and the hole transport layer adjacent to the light-emitting layer.

[0227] It should be noted that in other embodiments, according to different manufacturing processes and different requirements for the display panel's luminescence (such as luminous brightness, color gamut, luminous efficiency, etc.), the corresponding auxiliary layers may be increased or decreased, and the number of FMMs required to prepare the luminous layer may be increased or decreased accordingly.

[0228] For example, refer to Fig. 13B Compared with the display panel 30 , no auxiliary layer is disposed between the light emitting units of the red sub-pixel, the green sub-pixel and the cyan sub-pixel in the light emitting layer 305 and the HTL 305 in the display panel 30 ′.

[0229] It should be noted that Fig.13A and Fig. 13B The fact that no auxiliary layer is provided between the light-emitting unit of the blue sub-pixel and the adjacent HTL is only an example. In other embodiments, no auxiliary layer may be provided between the light-emitting units of sub-pixels of other one or more colors and the adjacent HTL, or an auxiliary layer may be provided between the light-emitting units of sub-pixels of all colors and the adjacent HTL. This is not limited here.

[0230] For example, in some embodiments, an auxiliary layer may be provided between the light-emitting units of the red sub-pixel, the green sub-pixel, and the blue sub-pixel in the light-emitting layer 306 and the HTL 305, and an auxiliary layer may be provided between the light-emitting units of the red sub-pixel, the green sub-pixel, and the blue sub-pixel in the light-emitting layer 313 and the HTL 312, but no auxiliary layer may be provided between the light-emitting unit of the blue sub-pixel and the adjacent HTL.

[0231] For another example, in some embodiments, an auxiliary layer may be set between the light-emitting units of the red sub-pixel, cyan sub-pixel, and blue sub-pixel in the light-emitting layer 306 and the HTL 305, and an auxiliary layer may be set between the light-emitting units of the red sub-pixel, cyan sub-pixel, and blue sub-pixel in the light-emitting layer 313 and the HTL 312, but no auxiliary layer may be set between the light-emitting unit of the green sub-pixel and the adjacent HTL.

[0232] For another example, in some embodiments, an auxiliary layer may be set between the light-emitting units of the green sub-pixel, cyan sub-pixel, and blue sub-pixel in the light-emitting layer 306 and the HTL 305, and an auxiliary layer may be set between the light-emitting units of the green sub-pixel, cyan sub-pixel, and blue sub-pixel in the light-emitting layer 313 and the HTL 312, but no auxiliary layer may be set between the light-emitting unit of the red sub-pixel and the adjacent HTL.

[0233] Corresponds to Fig.13A and Fig. 13B In the case shown, the shape, arrangement order and number of sub-pixels can adopt a variety of different settings.

[0234] It should be noted that in other embodiments, one or more of the red sub-pixels, green sub-pixels, blue sub-pixels, and cyan sub-pixels in the display panel 30 / 30′ may be replaced with sub-pixels of other colors, which is not limited here. For example, the cyan sub-pixel may be replaced with a sub-pixel that emits white light, a cyan sub-pixel, etc.

[0235] For example, FIG. 14A to FIG. 14E Schematic diagram showing various sub-pixel arrangements.

[0236] refer to Fig.14A , a pixel may include 4 rectangular sub-pixels, namely a red sub-pixel, a green sub-pixel, a blue sub-pixel and an azure sub-pixel. In each pixel, the red sub-pixel, the green sub-pixel, the blue sub-pixel and the azure sub-pixel are arranged in the same manner. For example, the red sub-pixel, the green sub-pixel, the azure sub-pixel and the blue sub-pixel may be respectively arranged at the upper left corner, the lower left corner, the upper right corner and the lower right corner of a pixel.

[0237] It should be noted that the corresponding Fig.14A In the situation shown, the positions of the sub-pixels can be exchanged while ensuring that the arrangement of the sub-pixels in each pixel is the same.

[0238] refer to Fig. 14B , a pixel may include 4 circular sub-pixels, namely a red sub-pixel, a green sub-pixel, a blue sub-pixel and an azure sub-pixel. In each pixel, the red sub-pixel, the green sub-pixel, the blue sub-pixel and the azure sub-pixel are distributed in the same manner. For example, the red sub-pixel, the green sub-pixel, the azure sub-pixel and the blue sub-pixel may be respectively arranged at the upper left corner, the lower left corner, the upper right corner and the lower right corner of a pixel.

[0239] It should be noted that the corresponding Fig. 14B In the situation shown, the positions of the sub-pixels can be exchanged while ensuring that the arrangement of the sub-pixels in each pixel is the same.

[0240] Exemplarily, a pixel may include 4 rectangular sub-pixels, which are red sub-pixels, green sub-pixels, blue sub-pixels and azure sub-pixels. The 4 sub-pixels in a pixel are respectively arranged at the four corners of a pixel. Wherein, the arrangement of the sub-pixels in two adjacent pixels is mirrored relative to the X direction. Exemplarily, the 4 color sub-pixels in each pixel can be arranged in two rows and two columns, the sub-pixels of the first color and the sub-pixels of the second color are arranged in one column, and the sub-pixels of the third color and the sub-pixels of the fourth color are arranged in another column. For example, the sub-pixels of the first color and the sub-pixels of the second color are arranged at two adjacent corners in the Y direction, and the sub-pixels of the third color and the sub-pixels of the fourth color are arranged at the other two adjacent corners in the Y direction. In this way, the sub-pixels of the first color and the sub-pixels of the second color in two adjacent pixels are arranged in the opposite order in the Y direction, and the sub-pixels of the third color and the sub-pixels of the fourth color in two adjacent pixels are arranged in the opposite order in the Y direction.

[0241] For example, for Fig. 14C In the case shown, the sub-pixels of the first to fourth colors can be red sub-pixels, green sub-pixels, azure sub-pixels, and blue sub-pixels, respectively. There are two columns of sub-pixels in each pixel, and the red sub-pixels and azure sub-pixels are arranged in the same row, and the green sub-pixels and blue sub-pixels are arranged in the same row. In pixel P14, the red sub-pixels and azure sub-pixels are arranged in the first row, and the green sub-pixels and blue sub-pixels are arranged in the first row and the second row. Pixel P15 and pixel P16 are adjacent to pixel P14, and the red sub-pixels and azure sub-pixels are arranged in the second row, and the green sub-pixels and blue sub-pixels are arranged in the first row. Pixel P17 is adjacent to pixel P15 and pixel P16, respectively, and the color arrangement of the sub-pixels in the adjacent pixels P15 and pixel P16 is the same, and the red sub-pixels and azure sub-pixels in pixel 17 are arranged in the first row, and the green sub-pixels and blue sub-pixels are arranged in the second row.

[0242] It should be noted that the sub-pixels of the first color to the sub-pixels of the fourth color can be any one of the full arrangements of red sub-pixels, green sub-pixels, blue sub-pixels and azure sub-pixels (the full arrangement of sub-pixels of four colors has a total of 4! = 24 arrangements). For example, the sub-pixels of the first color to the sub-pixels of the fourth color can be red sub-pixels, green sub-pixels, blue sub-pixels and azure sub-pixels, respectively, or green sub-pixels, red sub-pixels, blue sub-pixels and azure sub-pixels, respectively, or green sub-pixels, red sub-pixels, blue sub-pixels and azure sub-pixels, ... etc. Since when the size of a pixel is constant, the more sub-pixels there are in the pixel, the smaller the size of a single sub-pixel, and the smaller the size of the opening in the FMM used to prepare the light-emitting unit. Based on Fig. 14CIn the arrangement shown, except for the sub-pixels at the edge of the display panel, each sub-pixel has a sub-pixel of the same color adjacent to it in the Y direction. Therefore, each sub-pixel can be prepared using one opening in the FMM with the sub-pixel of the same color adjacent to it in the Y direction, that is, the opening in the FMM can be twice the size of the sub-pixel, which can avoid using an FMM with a smaller opening, which is beneficial to cost saving.

[0243] For example, for Fig. 14C In the pixels P14 to P17, the blue sub-pixel in the pixel P14 and the pixel P16 is close to the boundary between the pixel P14 and the pixel P16, and the blue sub-pixel in the pixel P14 and the blue sub-pixel in the pixel P16 can be prepared through the opening K10 in the FMM; the green sub-pixel in the pixel P14 and the pixel P16 is close to the boundary between the pixel P14 and the pixel P16, and the green sub-pixel in the pixel P14 and the green sub-pixel in the pixel P16 can be prepared through the opening K11 in the FMM; the red sub-pixel in the pixel P15 and the pixel P17 is close to the boundary between the pixel P15 and the pixel P17, and the red sub-pixel in the pixel P15 and the red sub-pixel in the pixel P17 can be prepared through the opening K12 in the FMM; the cyan sub-pixel in the pixel P15 and the pixel P17 is close to the boundary between the pixel P15 and the pixel P17, and the cyan sub-pixel in the pixel P15 and the cyan sub-pixel in the pixel P17 can be prepared through the opening K13 in the FMM.

[0244] In addition, when the minimum size of the opening that can be manufactured on the FMM is constant, Fig. 14C The pixel size of the display panel with the pixel arrangement shown in FIG. 1 can be smaller. For example, if the minimum size of the opening that can be manufactured on the FMM is 5 μm, Fig. 14C When the display panel has the pixel arrangement shown in the figure, the size of a single sub-pixel can be 2.5 μm; Fig.14A or Fig. 14B When the display panel has the pixel arrangement shown, the size of a single sub-pixel is 5 μm.

[0245] Exemplarily, a pixel may include 4 rectangular sub-pixels, which are red sub-pixels, green sub-pixels, blue sub-pixels and azure sub-pixels. The 4 sub-pixels in a pixel are respectively arranged at the four corners of a pixel. Wherein, the arrangement of the sub-pixels in two adjacent pixels is mirrored relative to the Y direction. Exemplarily, the 4 color sub-pixels in each pixel can be arranged in two rows and two columns, the sub-pixels of the first color and the sub-pixels of the second color are arranged in one column, and the sub-pixels of the third color and the sub-pixels of the fourth color are arranged in another column. For example, the sub-pixels of the first color and the sub-pixels of the second color are arranged at two adjacent corners in the X direction, and the sub-pixels of the third color and the sub-pixels of the fourth color are arranged at the other two adjacent corners in the X direction. In this way, the sub-pixels of the first color and the sub-pixels of the second color in two adjacent pixels are arranged in the opposite order in the X direction, and the sub-pixels of the third color and the sub-pixels of the fourth color in two adjacent pixels are arranged in the opposite order in the X direction.

[0246] For example, for Fig.14D In the case shown, the sub-pixels of the first to fourth colors can be red sub-pixels, azure sub-pixels, green sub-pixels, and blue sub-pixels, respectively. Each pixel has two rows and two columns of sub-pixels, and the red sub-pixels and green sub-pixels are arranged in the same column, and the azure sub-pixels and blue sub-pixels are arranged in the same column. In pixel P18, the red sub-pixels and green sub-pixels are arranged in the first column, and the azure sub-pixels and blue sub-pixels are arranged in the second column. Pixels P19 and P20 are adjacent to pixel P18, and the red sub-pixels and green sub-pixels are arranged in the second column, and the azure sub-pixels and blue sub-pixels are arranged in the first column. Pixel P21 is adjacent to pixel P20 and pixel P18, respectively, and the sub-pixels in the adjacent pixels P20 and P18 have the same color arrangement, and the red sub-pixels and green sub-pixels in pixel P21 are arranged in the first column, and the azure sub-pixels and blue sub-pixels are arranged in the second column.

[0247] It should be noted that the sub-pixels of the first color to the sub-pixels of the fourth color may be any one of the full arrangements of red sub-pixels, azure sub-pixels, blue sub-pixels, and green sub-pixels (the full arrangements of the sub-pixels of the four colors have a total of 4!=24 arrangements). For example, the sub-pixels of the first color to the sub-pixels of the fourth color may be red sub-pixels, azure sub-pixels, blue sub-pixels, and green sub-pixels, respectively, or azure sub-pixels, red sub-pixels, blue sub-pixels, and green sub-pixels, respectively, or azure sub-pixels, red sub-pixels, blue sub-pixels, and green sub-pixels, ... and so on.

[0248] When the size of a pixel is constant, the more sub-pixels there are in a pixel, the smaller the size of a single sub-pixel is, and the smaller the size of the opening in the FMM used to prepare the light-emitting unit is. Fig.14D In the arrangement shown, except for the sub-pixels at the edge of the display panel, each sub-pixel has a sub-pixel of the same color adjacent to it in the X direction. Therefore, each sub-pixel can be prepared using one opening in the FMM with the sub-pixel of the same color adjacent to it in the X direction, that is, the opening in the FMM can be twice the size of the sub-pixel, which can avoid using an FMM with a smaller opening, which is beneficial to cost saving.

[0249] For example, for Fig.14D In the pixels P18 to P21, the blue sub-pixel in the pixel P18 and the pixel P19 is close to the boundary between the pixel P18 and the pixel P19, and the blue sub-pixel in the pixel P18 and the blue sub-pixel in the pixel P19 can be prepared through the opening K14 in the FMM; the green sub-pixel in the pixel P20 and the pixel P21 is close to the boundary between the pixel P20 and the pixel P21, and the green sub-pixel in the pixel P20 and the green sub-pixel in the pixel P21 can be prepared through the opening K15 in the FMM; the cyan sub-pixel in the pixel P18 and the pixel P19 is close to the boundary between the pixel P18 and the pixel P19, and the cyan sub-pixel in the pixel P18 and the cyan sub-pixel in the pixel P19 can be prepared through the opening K17 in the FMM; the red sub-pixel in the pixel P20 and the pixel P21 is close to the boundary between the pixel P20 and the pixel P21, and the red sub-pixel in the pixel P20 and the red sub-pixel in the pixel P21 can be prepared through the opening K16 in the FMM.

[0250] It should be noted that FIG. 14A to FIG. 14D The shape of the sub-pixel in is only an example. In other embodiments, the shape of the sub-pixel may also be other shapes, such as a circle, an ellipse, other polygons, an irregular shape, etc., which is not limited in the embodiments of the present application.

[0251] For example, Fig.14E In the sub-pixel arrangement shown in FIG. 1 , the arrangement of each color sub-pixel is the same as Fig. 14C The difference is that the shape of each sub-pixel is circular.

[0252] In some embodiments, due to Fig. 14C and Fig.14E In the sub-pixel arrangement shown, at least some of the sub-pixels can be prepared by FMMs with an opening size that is twice (or more) the size of the sub-pixels. When the minimum opening size of the FMM is constant, a display panel with a smaller pixel size and a higher pixel density can be prepared. Fig. 14C and Fig.14E The sub-pixel arrangement shown may be used for display panels with a higher pixel density and / or a smaller pixel size.

[0253] It should be noted that FIG. 14A to FIG. 14EThe color of the neutron pixel is only an example. In other embodiments, one or more of the red sub-pixels, blue sub-pixels, green sub-pixels, and cyan sub-pixels may be replaced by sub-pixels of other colors, which is not limited to the embodiments of the present application.

[0254] Embodiment 3: A pixel in the display panel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and each color sub-pixel includes a plurality of blue light-emitting units. In this display panel, the blue light can be converted into the color of the corresponding sub-pixel by stacking a color conversion layer and a filter layer on the encapsulation layer.

[0255] like Fig.15A As shown, the CGL in the display panel 40 is the aforementioned three-layer CGL. Specifically, the display panel 40 includes a substrate 401, a driving layer 402, an anode 403, a HIL 404, a HTL 405, a light-emitting layer 406, a HBL 407, an ETL 408, an N-CGL 409, an i-CGL 410, a P-CGL 411, an HTL 412, a light-emitting layer 413, a HBL 414, an ETL 415, an EIL 416, a cathode 417, a CPL 418, an encapsulation layer 419, a CCL 420, and a filter layer 421, which are sequentially stacked along the Z direction. Among them, the HBL 407 and the HBL 414 are optional, and the functions and materials of each layer can refer to the relevant contents in the aforementioned display panel 10, and are not limited here.

[0256] For the red sub-pixel, the light-emitting layer 406 may include a blue light-emitting unit B3, and the light-emitting layer 413 may include a blue light-emitting unit B4. The CCL 420 may be a red CCL for converting blue light into red light; the filter layer 421 may include a red filter (or a red filter film) for filtering out light of colors other than red light. In other words, the complex light (or monochromatic light when the light emitted by the blue light-emitting unit B3 and the blue light-emitting unit B4 is a single color) after the light is combined can be converted into red light in the filter layer.

[0257] For the green sub-pixel, the light-emitting layer 406 may include a blue light-emitting unit B5, and the light-emitting layer 413 may include a blue light-emitting unit B6. The CCL 420 may be a green CCL for converting blue light into green light; the filter layer may include a green filter (or a green filter film) for filtering out light of colors other than green light. In other words, the complex light (or monochromatic light when the light emitted by the blue light-emitting unit B5 and the blue light-emitting unit B6 is a single color) after the light is combined can be converted into green light in the filter layer.

[0258] For the blue sub-pixel, the light-emitting layer 406 may include a blue light-emitting unit B7, and the light-emitting layer 413 may include a blue light-emitting unit B9. The CCL 420 may be a blue CCL for converting the light emitted by the blue light-emitting unit B7 and the blue light-emitting unit B9 into blue light; the filter layer 421 may include a blue filter (or a blue filter film) for filtering out light of colors other than blue light.

[0259] In other embodiments, for Fig.15A In the display panel shown, the blue sub-pixel may also directly stack a filter layer on the encapsulation layer 419 instead of stacking a blue color conversion layer on the encapsulation layer.

[0260] For example, Fig. 15B FIG. 4 shows a schematic diagram of a display panel 40′. Fig. 15B As shown, compared with the display panel 40 ′, the blue sub-pixel has a blue filter (or filter film) directly stacked on the encapsulation layer 419 instead of first stacking the blue CCL and then stacking the blue filter layer.

[0261] for Fig.15A and Fig. 15B The arrangement of sub-pixels in the display panel shown in FIG. FIG. 12A to FIG. 12F The embodiments of the present invention are not described in detail here.

[0262] Embodiment 4: A pixel in the display panel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, and each color sub-pixel includes a blue light-emitting unit and a white light-emitting unit. In this display panel, the blue light can be converted into the color of the corresponding sub-pixel by stacking a color conversion layer and a filter layer on the encapsulation layer.

[0263] like Fig.16A As shown, the CGL in the display panel 50 is the aforementioned three-layer CGL. Specifically, the display panel 50 includes a substrate 501, a driving layer 502, an anode 503, a HIL 504, a HTL 505, a light-emitting layer 506, a HBL 507, an ETL 508, an N-CGL 509, an i-CGL 510, a P-CGL 511, an HTL 512, a light-emitting layer 513, a HBL 514, an ETL 515, an EIL 516, a cathode 517, a CPL 518, an encapsulation layer 519, and a filter layer 520, which are sequentially stacked along the Z direction. Among them, HBL 407 and HBL 414 are optional, and the functions and materials of each layer can refer to the relevant contents in the aforementioned display panel 10, and are not limited here.

[0264] For the red sub-pixel, the light-emitting layer 506 may include a blue light-emitting unit B9, and the light-emitting layer 513 may include a white light (or other complex light) light-emitting unit (for example, a light-emitting unit that emits complex light of red and green light, or a light-emitting unit that emits complex light thereof) RG1. The filter layer 520 may include a red filter (or a red filter film) for filtering out light of colors other than red light. That is, the complex light after the light emitted by the blue light-emitting unit B9 and the white light-emitting unit RG1 is combined can be converted into red light in the filter layer.

[0265] For the green sub-pixel, the light-emitting layer 506 may include a blue light-emitting unit B10, and the light-emitting layer 513 may include a white light-emitting unit RG2. The filter layer 520 may include a green filter (or a green filter film) for filtering out light of colors other than green light. In other words, the complex light after the light emitted by the blue light-emitting unit B10 and the white light-emitting unit RG2 is combined can be converted into green light in the filter layer.

[0266] For the blue sub-pixel, the light-emitting layer 506 may include a blue light-emitting unit B11, and the light-emitting layer 513 may include a white light-emitting unit RG3. The filter layer may include a blue filter (or a blue filter film) for filtering out light of colors other than blue light. In other words, the complex light after the light emitted by the blue light-emitting unit B11 and the light-refraction light-emitting unit RG3 is combined can be converted into blue light in the filter layer.

[0267] In some other embodiments, the light-emitting units of the light-emitting layer 506 and the light-emitting layer 513 in the display panel 50 may interact with each other. Fig. 16B According to some embodiments of the present application, a schematic diagram of the structure of a display panel 50' is shown. Compared with the display panel 50, the light-emitting layer 506 of the display panel 50' is used to set the white light-emitting unit corresponding to each sub-pixel, and the light-emitting layer 513 is used to set the blue light-emitting unit corresponding to each sub-pixel.

[0268] for Fig.16A and Fig. 16B The arrangement of sub-pixels in the display panel shown in FIG. FIG. 12A to FIG. 12F The embodiments of the present invention are not described in detail here.

[0269] In some embodiments, for Fig.16A and Fig. 16B In the display panel shown, the blue light emitting unit can be replaced by a light emitting unit of other colors, and the white light emitting unit can also be replaced by a light emitting unit of other colors, which is not limited here.

[0270] An embodiment of the present application further provides a display panel, in which one pixel includes sub-pixels of four colors, and one sub-pixel includes one light-emitting unit.

[0271] For example, Fig.17 According to some embodiments of the present application, a schematic diagram of a pixel arrangement and an FF cross section of a display panel 60 is shown.

[0272] refer to Fig.17 In the display panel 60, the four sub-pixels in one pixel are respectively arranged at the four corners of one pixel, and the arrangement of the sub-pixels in two adjacent pixels is mirrored relative to the X direction. Exemplarily, the sub-pixels of the three colors in each pixel can be arranged in two rows and two columns, the sub-pixels of the first color and the sub-pixels of the second color are arranged in one column, and the sub-pixels of the third color and the sub-pixels of the fourth color are arranged in another column. For example, the sub-pixels of the first color and the sub-pixels of the second color are arranged at two adjacent corners in the Y direction, and the sub-pixels of the third color and the sub-pixels of the fourth color are arranged at the other two adjacent corners in the Y direction. In this way, the sub-pixels of the first color and the sub-pixels of the second color in two adjacent pixels are arranged in the opposite order in the Y direction, and the sub-pixels of the third color and the sub-pixels of the fourth color in two adjacent pixels are arranged in the opposite order in the Y direction. For specific arrangement methods, please refer to Fig. 14C The illustrated embodiments are not described in detail here.

[0273] refer to Fig.17 The display panel 60 includes a substrate 601, a driving layer 602, an anode 603, a HIL 604, a HTL 605, a light emitting layer 606, a HBL 607, an ETL 608, an EIL 609, a cathode 610, a CPL 611, and an encapsulation layer 612, which are sequentially stacked along the Z direction. Among them, the HBL 607 is optional, and the functions and materials of each layer can refer to the relevant contents of the aforementioned display panel 10, which are not limited here.

[0274] For the sub-pixel of the first color, the light-emitting layer 606 may include an auxiliary layer 61 and a light-emitting unit 62 of the first color stacked in sequence, and the auxiliary layer 61 is disposed on a side of the light-emitting layer 606 close to the HTL 605 .

[0275] For the sub-pixel of the second color, the light emitting layer 606 may include an auxiliary layer 63 and a light emitting unit 64 of the second color stacked in sequence, and the auxiliary layer 63 is disposed on a side of the light emitting layer 606 close to the HTL 605 .

[0276] For the sub-pixel of the third color, the light emitting layer 606 may include an auxiliary layer 65 and a light emitting unit 66 of the third color stacked in sequence, and the auxiliary layer 65 is disposed on a side of the light emitting layer 606 close to the HTL 605 .

[0277] For the sub-pixel of the fourth color, the light-emitting layer 606 may include a light-emitting unit 67 .

[0278] In some embodiments, auxiliary layer 61 , auxiliary layer 63 , and auxiliary layer 65 are optional.

[0279] In some embodiments, an auxiliary layer may also be disposed between the light emitting unit 67 and the HTL 605 .

[0280] It should be noted that, in other embodiments, the shape of the sub-pixels in the display panel 60 may be rectangular, circular, elliptical, other polygonal, irregular, etc.

[0281] In some embodiments, the sub-pixels of the first color to the sub-pixels of the fourth color can be any one of the full arrangements of sub-pixels of four colors (for example, red sub-pixels, green sub-pixels, blue sub-pixels, and cyan sub-pixels) (the full arrangement of sub-pixels of four colors has a total of 4! = 24 arrangements).

[0282] In the display panels provided by the aforementioned embodiments, crosstalk between sub-pixels can be reduced or even avoided without adding isolation columns or other isolation structures. Since no isolation columns or other isolation structures are provided, the area between the anodes in the anode layer presents a flat structure, and the surface of the area is continuous without protrusions or grooves.

[0283] For example, Fig.18 According to some implementation examples of the present application, a schematic structural diagram of the adjacent first anode and second anode in the aforementioned anode layer 203 / 303 / 403 / 503 / 603 and the PDL 30 is shown.

[0284] like Fig.18 As shown, the PDL 30 between the first anode and the second anode can be in the shape of a water drop, and its slope angle a can be defined: a tangent L0 of the arc surface 30a is made through the intersection of the arc surface 30a of the PDL and the top surface 30b of the anode, and the acute angle formed by the tangent L0 and the top surface 30b is called the slope angle a. For the portion of the cathode 40 (for example, the aforementioned cathode 217, cathode 317, cathode 417, cathode 517, cathode 610) located between the adjacent first anode and the second anode: the acute angle formed by the line connecting any two points on the surface 40a of the cathode 40 facing the PDL 30 and the top surface 30b is less than or equal to the slope angle a, for example, the acute angle b formed by the line L1 and the top surface 30b is less than the slope angle a; the acute angle formed by the line connecting any two points on the surface 40b of the cathode 40 facing away from the PDL 30 and the top surface 30b is less than or equal to the slope angle a, for example, the acute angle c formed by the line L2 and the top surface 30b is less than the slope angle a. Fig.18 Only the case where the acute angle formed by the connecting line and the top surface 30b is smaller than the slope angle a is listed. It is easy to understand that there is such a connecting line, the acute angle formed by the connecting line and the top surface 31b is equal to the slope angle a.

[0285] It should be noted that the first anode and the second anode may be anodes of different sub-pixels in the same pixel, or anodes of adjacent sub-pixels in different pixels, which is not limited here. Fig. 12C The anode of the red sub-pixel and the anode of the green sub-pixel in the pixel P2 may be the first anode and the second anode respectively, and the anode of the green sub-pixel in the pixel P2 and the anode of the red sub-pixel in the pixel P4 may be the first anode and the second anode respectively. Fig. 14C In the embodiment, when the anode of the blue sub-pixel in pixel P14 is the first anode, the second anode may be: the anode of the cyan sub-pixel or the anode of the green sub-pixel in pixel P4, or the anode of the red sub-pixel in pixel P15, or the anode of the blue sub-pixel in pixel P16.

[0286] It should be noted that the aforementioned HIL, HTL, light emitting layer, HBL, ETL, and EIT are disposed between the anode layer 203 / 303 / 403 / 503 / 603 and the cathode 40. For details, please refer to the aforementioned Figures 4 to 17 The embodiments of the present invention are not described in detail here.

[0287] It should be noted that Fig.18 The PDL shown is only an example. In other embodiments, the shape of the PDL may be other shapes, which is not limited here.

[0288] The present application also provides an electronic device, which includes any display panel provided in the above embodiments. The electronic device can be any electronic device that can display a picture. Including but not limited to mobile phones (such as straight-plate mobile phones, foldable mobile phones, curved screen mobile phones, etc.), tablet computers, laptops (including foldable laptops), smart screens, desktop displays, smart wearable products (such as smart watches, smart bracelets, etc.), mixed reality devices (mixed reality, MR), virtual reality devices (virtual reality, VR), augmented reality devices (augmentedreality, AR), vehicle-mounted devices (such as car computers, vehicle-mounted navigators), home electronic products such as smart door locks, TVs, refrigerators, rechargeable small household appliances (such as soybean milk machines, sweeping robots), etc.

[0289] In some embodiments, the electronic device includes a structure and a display screen fixed on the structure. The display screen may include a cover plate and a display panel. The cover plate is bonded to the display panel. The display panel may be the display panel provided in the aforementioned embodiments.

[0290] In the description of the embodiments of the present application, unless otherwise specified, “multiple (layers)” refers to two (layers) or more.

[0291] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Features qualified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0292] "Connect" should be understood in a broad sense, for example, "connect" can be detachably connected or non-detachably connected; it can be directly connected or indirectly connected through an intermediate medium. "Fix" should also be understood in a broad sense, for example, "fix" can be directly fixed or indirectly fixed through an intermediate medium.

[0293] The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "left", "right", "upper left", "lower left", "upper right", "lower right", etc., are only reference directions of the drawings. The directional terms are for better and clearer explanation and understanding of the embodiments of the present application, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, etc., and therefore cannot be understood as limiting the embodiments of the present application.

[0294] In the description of the embodiments of the present application, unless otherwise specified, "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone.

[0295] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: an anode layer, a plurality of light emitting layers, a cathode and a plurality of charge generation layers; wherein: The plurality of light-emitting layers and the plurality of charge generation layers are disposed between the anode layer and the cathode, and one charge generation layer is disposed between every two light-emitting layers; The charge generation layer includes an N-type charge generation layer, an insertion layer, and a P-type charge generation layer sequentially stacked along a first direction, wherein the first direction is a direction from the anode layer to the cathode, and The sheet resistance of the charge generation layer in a direction perpendicular to the first direction is greater than 1 GΩ / □, The insertion layer is made of an organic material, and the lowest unoccupied molecular orbital energy level of the organic material is less than or equal to -3.5 eV. The insertion layer is made of an inorganic material, and the work function of the inorganic material is greater than or equal to 3.5 eV.

2. The display panel according to claim 1, characterized in that: The thickness of the insertion layer is less than or equal to 15 nm.

3. The display panel according to claim 1, characterized in that: The thickness of the insertion layer is less than or equal to 5 nm.

4. The display panel according to claim 1, characterized in that: The Fermi level of the insertion layer is lower than the Fermi level of the host material of the P-type charge generation layer.

5. The display panel according to claim 1, characterized in that: The material of the N-type charge generation layer includes a host material and a guest material, and the concentration of the guest material is ∈(0%, 10%].

6. The display panel according to claim 1, characterized in that: The display panel further comprises a pixel definition layer, the anode layer comprises a plurality of anodes, and any two adjacent anodes among the plurality of anodes are isolated by the pixel definition layer; And, corresponding to a first anode and a second anode adjacent to each other in the plurality of anodes: The first anode has a top surface facing the cathode layer; The portion of the pixel definition layer located between the first anode and the second anode has a slope angle; The acute angle formed by a line connecting any two points on the surface of the cathode facing the pixel definition layer and the top surface is less than or equal to the slope angle; An acute angle formed by a line connecting any two points on a surface of the cathode facing away from the pixel definition layer and the top surface is less than or equal to the slope angle.

7. The display panel according to claim 1, characterized in that: The display panel further includes a hole injection layer, an electron injection layer, a plurality of hole transport layers, a plurality of electron transport layers and a substrate; in, The hole injection layer and the hole transport layer are sequentially stacked along the first direction between the anode layer and a first light-emitting layer closest to the anode layer among the plurality of light-emitting layers; An electron transport layer and an electron injection layer are sequentially stacked along the first direction between the cathode and a second light-emitting layer closest to the cathode among the plurality of light-emitting layers; An electron transport layer and a hole transport layer are disposed between every two light-emitting layers, and the electron transport layer, the insertion layer and the hole transport layer between every two light-emitting layers are sequentially stacked along the first direction; The substrate is arranged on a side of the anode layer away from the cathode layer.

8. The display panel according to claim 7, characterized in that: The display panel further includes a plurality of hole blocking layers, and one hole blocking layer is disposed between each of the light emitting layers and the adjacent electron transport layer.

9. The display panel according to any one of claims 1 to 8, characterized in that: The display panel includes a plurality of pixels arranged in an array, each pixel includes four sub-pixels of different colors, and the four sub-pixels in one pixel are arranged in two rows and two columns; Among them, the color setting method of the sub-pixels in the first row of one pixel of two adjacent pixels is the same as the color setting method of the sub-pixels in the second row of the other pixel, and the color setting method of the sub-pixels in the second row of the one pixel is the same as the color setting method of the sub-pixels in the first row of the other pixel.

10. The display panel according to any one of claims 1 to 8, characterized in that: The display panel includes a plurality of pixels arranged in an array, each pixel includes four sub-pixels of different colors, and the four sub-pixels in one pixel are arranged in two rows and two columns; Among them, the color setting method of the sub-pixels in the first column of one pixel of two adjacent pixels is the same as the color setting method of the sub-pixels in the second column of the other pixel, and the color setting method of the sub-pixels in the second column of the one pixel is the same as the color setting method of the sub-pixels in the first column of the other pixel.

11. The display panel according to claim 9 or 10, characterized in that: The four sub-pixels of different colors include a red sub-pixel, a blue sub-pixel, a green sub-pixel, and a cyan sub-pixel.

12. The display panel according to claim 11, characterized in that: Each of the red sub-pixels includes a first auxiliary layer and a red light-emitting unit stacked along the first direction in each of the light-emitting layers; each of the green sub-pixels includes a second auxiliary layer and a green light-emitting unit stacked along the first direction in each of the light-emitting layers; each of the blue sub-pixels includes a third auxiliary layer and a blue light-emitting unit stacked along the first direction in each of the light-emitting layers; and each of the azure sub-pixels includes an azure light-emitting unit in each of the light-emitting layers.

13. The display panel according to claim 11, characterized in that: The display panel comprises two light-emitting layers; and: The light-emitting layer of each red sub-pixel close to the cathode in the two light-emitting layers includes a first auxiliary layer and a red light-emitting unit stacked along the first direction, and the light-emitting layer close to the anode layer in the two light-emitting layers includes a red light-emitting unit; The light-emitting layer of each green sub-pixel close to the cathode in the two light-emitting layers includes a second auxiliary layer and a red light-emitting unit stacked along the first direction, and the light-emitting layer close to the anode layer in the two light-emitting layers includes a red light-emitting unit; The light-emitting layer of each blue sub-pixel close to the cathode in the two light-emitting layers includes a first auxiliary layer and a blue light-emitting unit stacked along the first direction, and the light-emitting layer close to the anode layer in the two light-emitting layers includes a blue light-emitting unit; Each of the azure sub-pixels includes an azure light-emitting unit in each of the light-emitting layers.

14. The display panel according to any one of claims 1 to 8, characterized in that: The display panel includes a plurality of pixels arranged in an array, and each pixel includes a red sub-pixel, a blue sub-pixel and one or more green sub-pixels.

15. The display panel according to claim 14, characterized in that: The light-emitting unit of each red sub-pixel in each light-emitting layer is a red light-emitting unit; the light-emitting unit of each green sub-pixel in each light-emitting layer is a green light-emitting unit; and the light-emitting unit of each blue sub-pixel in each light-emitting layer is a blue light-emitting unit.

16. The display panel according to any one of claims 1 to 15, characterized in that: The display panel further includes a covering layer and an encapsulation layer which are sequentially stacked along the first direction by the cathode.

17. The display panel according to claim 14, characterized in that: The display panel further includes a covering layer, an encapsulation layer, a color conversion layer and a filter layer sequentially stacked by the cathode along the first direction, and the light-emitting unit of each of the red sub-pixel, each of the green sub-pixel and the blue sub-pixel in each of the light-emitting layers is a blue light-emitting unit; and The red sub-pixel includes a red conversion unit in the color conversion layer and a red filter unit in the filter layer, wherein the red conversion unit is used to convert the light emitted by the blue light-emitting unit corresponding to the red sub-pixel into red light for emission, and the red filter unit is used to filter the red light emitted by the red conversion unit and then emit red light; The green sub-pixel includes a green conversion unit in the color conversion layer and a green filter unit in the filter layer, wherein the green conversion unit is used to convert the light emitted by the blue light-emitting unit corresponding to the green sub-pixel into green light for emission, and the green filter unit is used to filter the green light emitted by the green conversion unit and then emit green light; The blue sub-pixel includes a blue conversion unit in the color conversion layer and a blue filter unit in the filter layer, wherein the blue conversion unit is used to convert the light emitted by the blue light-emitting unit corresponding to the blue sub-pixel into blue light for emission, and the blue filter unit is used to filter the blue light emitted by the blue conversion unit and then emit blue light, or, The blue sub-pixel includes a blue filter unit in the filter layer, and the blue conversion unit is used for filtering the light emitted by the blue light-emitting unit corresponding to the blue sub-pixel and then emitting blue light.

18. The display panel according to claim 14, characterized in that: The display panel further includes a covering layer, an encapsulation layer, and a filter layer sequentially stacked by the cathode along the first direction, and the light-emitting units of each of the red sub-pixel, each of the green sub-pixel, and each of the blue sub-pixel in the multiple light-emitting layers emit white light as a whole; and The red sub-pixel comprises a red filter unit in the filter layer, and the red filter unit is used to filter the white light emitted by the light-emitting unit corresponding to the red sub-pixel and then emit red light; The green sub-pixel includes a green filter unit in the filter layer, and the green filter unit is used to filter the white light emitted by the light-emitting unit corresponding to the green sub-pixel and then emit green light; The blue sub-pixel includes a blue filter unit in the filter layer, and the blue filter unit is used to filter the white light emitted by the light-emitting unit corresponding to the blue sub-pixel and then emit blue light.

19. A display screen, characterized in that: A display panel comprising any one of claims 1 to 18.

20. An electronic device, characterized in that: Includes the display screen as claimed in claim 19.

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