CN111863902A

CN111863902A - Display panel, display panel preparation method and display device

Info

Publication number: CN111863902A
Application number: CN202010705963.7A
Authority: CN
Inventors: 王杲祯
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2020-10-30
Anticipated expiration: 2040-07-21
Also published as: WO2022016749A1; CN111863902B

Abstract

The application provides a display panel, a display panel preparation method and a display device, wherein the display panel is additionally provided with blue light compensation patterns around a blue sub-pixel area, and the blue light compensation patterns have the characteristics of absorbing light with a wavelength larger than that of blue light and converting the light into the blue light, so that the problem of color cast of the OLED display panel due to blue light attenuation is solved, and the problem of color mixing of an abnormal coating film to the blue sub-pixel area is solved.

Description

Display panel, display panel preparation method and display device

Technical Field

The application relates to the technical field of display, in particular to a display panel, a display panel preparation method and a display device.

Background

The Organic Light-Emitting Diode (OLED) display technology has been developed for over 30 years, and is currently widely applied in the fields of illumination, display, and the like. The OLED display panel has the advantages of high brightness, high contrast, low power consumption, high response speed, wide viewing angle and the like, and in addition, the OLED display panel has the self-luminous characteristic and does not need to be additionally provided with a backlight source, so the OLED display panel has the characteristics of thin thickness and light weight and accords with the development trend of lightness and thinness of a display.

At present, in the process of manufacturing an OLED display panel, a Fine Metal Mask (FMM) is used to evaporate a small molecule organic light emitting material on a sub-pixel region of a substrate, so as to form a light emitting layer of a sub-pixel unit. In the coating by vaporization in-process, there is certain space usually between base plate and the FMM to avoid FMM and base plate direct contact and cause negative effects to the luminescent layer, and generally do not set up the obstacle that is used for restricting the coating by vaporization scope around the coating by vaporization district, consequently, according to the characteristic that coating by vaporization in-process evaporation goes on along the straight line, can cause the scope in coating by vaporization in-process coating by vaporization district to constantly enlarge, thereby arouse the shadow effect (shadow effect) in coating by vaporization district, and then the problem of colour mixture probably appears, if: the red light-emitting material or the green light-emitting material is evaporated to the blue sub-pixel area. In addition, the blue light emitting material has a short lifetime, which causes a color shift problem due to blue light attenuation after the OLED display panel is used for a period of time, thereby shortening the lifetime of the OLED display panel.

Disclosure of Invention

The application provides a display panel, a display panel preparation method and a display device, and on one hand, the problem of color mixing of a blue sub-pixel area caused by abnormal evaporation of a red light-emitting material and/or a green light-emitting material to the blue sub-pixel area is solved, and on the other hand, the problem of color cast of an OLED display panel caused by blue light attenuation is improved to a certain extent.

In a first aspect, the present application provides a display panel comprising:

the substrate is divided into a plurality of sub-pixel regions, and the sub-pixel regions comprise blue sub-pixel regions;

the first electrode layer is arranged on the substrate and comprises a plurality of first electrodes distributed in an array manner, and an opening area is formed between every two adjacent first electrodes;

the blue light compensation patterns are respectively arranged in the opening areas adjacent to the blue sub-pixel areas and used for absorbing light with the wavelength being larger than that of the blue light and converting the light into the blue light;

a pixel defining layer disposed on the substrate and including a plurality of banks distributed in an array to define each of the sub-pixel regions, each of the banks covering each of the opening regions, a gap region between adjacent banks being defined as one of the sub-pixel regions, and a bottom of each of the sub-pixel regions being a first electrode;

the sub-pixel units are respectively arranged in the sub-pixel areas, the sub-pixel units in the blue sub-pixel area are blue sub-pixel units, and the blue sub-pixel units are connected with the adjacent blue light compensation patterns; and

And the second electrode layer is arranged on each sub-pixel unit.

In some embodiments of the present application, the material of the blue compensation pattern is a host material doped with a rare earth ion, the host material is at least one of a halide, an oxide, an oxyhalide, a sulfur-containing compound, and a sulfur oxide, and the rare earth ion is Er³⁺、Tm³⁺、Dy³⁺、Ho³⁺、Eu³⁺And Tb³⁺At least one of (1).

In some embodiments of the present application, each of the blue light compensation patterns is attached to an edge of the first electrode at the bottom of the adjacent blue sub-pixel unit; or, each blue light compensation pattern is respectively conducted with the adjacent blue sub-pixel units.

In some embodiments of the present application, the display panel further comprises: and the packaging layer is arranged on the second electrode layer.

In some embodiments of the present application, the encapsulation layer comprises: a first inorganic layer, an organic layer and a second inorganic layer which are sequentially stacked, wherein the first inorganic layer and the second inorganic layer are respectively made of silicon nitride (SiN)_x) Silicon oxide (SiO)_x) And alumina (Al)₂O₃) The organic layer is made of at least one of polymethyl methacrylate and hexamethyl dimethyl siloxane.

In some embodiments of the present application, the first inorganic layer has a thickness of 0.5 to 1.5 micrometers, the second inorganic layer has a thickness of 0.5 to 1.5 micrometers, and the organic layer has a thickness of 4.0 to 12.0 micrometers.

In a second aspect, the present application provides a method for manufacturing a display panel, for manufacturing the display panel described in the first aspect, including the following steps:

providing a substrate, predefining a plurality of sub-pixel areas on the substrate, wherein the plurality of sub-pixel areas comprise a blue sub-pixel area;

preparing and forming a patterned first electrode layer on the substrate, wherein the first electrode layer comprises a plurality of first electrodes distributed in an array manner, and an opening area is formed between every two adjacent first electrodes;

respectively preparing and forming a blue light compensation pattern in each opening area adjacent to the predefined blue sub-pixel area, wherein the blue light compensation pattern is used for absorbing light with the wavelength being larger than that of the blue light and converting the light into the blue light;

preparing and forming a patterned pixel defining layer on the substrate, wherein the pixel defining layer comprises a plurality of dykes distributed in an array, each dyke covers each opening region, a gap region between every two adjacent dykes is defined as a sub-pixel region, and the bottom of each sub-pixel region is provided with a first electrode;

Preparing and forming a sub-pixel unit in each sub-pixel area, and connecting the blue sub-pixel unit in the blue sub-pixel area with each adjacent blue light compensation pattern; and

and preparing and forming a second electrode layer on each sub-pixel unit.

In some embodiments of the present application, the method for manufacturing a display panel further includes: and preparing and forming an encapsulation layer on the second electrode layer.

In some embodiments of the present application, the preparing and forming an encapsulation layer on the second electrode layer includes: a first inorganic layer, an organic layer and a second inorganic layer are sequentially formed on the second electrode layer, and the first inorganic layer and the second inorganic layer are respectively made of silicon nitride (SiN)_x) Silicon oxide (SiO)_x) And alumina (Al)₂O₃) The organic layer is made of at least one of polymethyl methacrylate and hexamethyl dimethyl siloxane.

In a third aspect, the present application provides a display device comprising the display panel described in the first aspect.

The application has the following beneficial effects:

the application provides a display panel, a method for preparing the display panel, and a display device using the display panel. Different from the existing OLED display panel, the display panel provided by the application adds the blue light compensation pattern around the blue sub-pixel area, and utilizes the blue light compensation pattern to absorb the light with the wavelength larger than the wavelength of the blue light and convert the light into the blue light, namely: the characteristic that the red luminescent material and/or the green luminescent material abnormally evaporated to the blue sub-pixel region can be absorbed and converted into blue light is achieved, so that the problem of color cast of the OLED display panel due to blue light attenuation is solved, and the display quality is improved; in addition, the problem of color mixing of the blue sub-pixel area caused by abnormal evaporation of the red luminescent material and/or the green luminescent material to the blue sub-pixel area is solved.

The display panel provided by the application is applied to the display device, has the advantages of long service life, high display quality and the like, and the display device can be any product or part with a display function, such as a smart phone, a tablet personal computer, a notebook computer, a digital camera, intelligent wearable equipment and the like.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a display panel provided in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a substrate divided into a plurality of sub-pixel regions according to an embodiment of the present disclosure.

Fig. 3 is a first schematic view illustrating connection between the blue sub-pixel unit and each of the adjacent blue compensation patterns according to an embodiment of the present disclosure.

Fig. 4 is a schematic diagram illustrating a connection between the blue sub-pixel unit and each of the adjacent blue light compensation patterns according to an embodiment of the present disclosure.

Fig. 5 is a flowchart of a method for manufacturing a display panel provided in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Specifically, in a first aspect, an embodiment of the present application provides a display panel, as shown in fig. 1 and fig. 2, including:

a substrate 1, a plurality of sub-pixel regions 10 are divided on the substrate 1, and the plurality of sub-pixel regions 10 include a blue sub-pixel region 101;

a first electrode layer 2 disposed on the substrate 1 and including a plurality of first electrodes 21 distributed in an array, wherein an opening region 22 is formed between each adjacent first electrode 21;

a plurality of blue light compensation patterns 3 respectively disposed in each of the opening regions 22 adjacent to the blue sub-pixel region 101, wherein the blue light compensation patterns 3 are configured to absorb light with a wavelength greater than that of blue light and convert the light into blue light;

a pixel defining layer 4 disposed on the substrate 1, including a plurality of banks 41 distributed in an array to define the sub-pixel regions 10, wherein each of the banks 41 covers each of the opening regions 22, a gap region between adjacent banks 41 is defined as one of the sub-pixel regions 10, and a bottom of each of the sub-pixel regions 10 is a first electrode 21.

A plurality of sub-pixel units 5 respectively disposed in each of the sub-pixel regions 10, wherein the sub-pixel unit 5 in the blue sub-pixel region 101 is a blue sub-pixel unit 51, and the blue sub-pixel unit 51 is connected to each of the adjacent blue light compensation patterns 3;

And a second electrode layer 6 disposed on each of the sub-pixel units 5.

Specifically, the substrate 1 includes a substrate base plate 11, the substrate base plate 11 is a rigid substrate or a flexible substrate, wherein the rigid substrate may be made of transparent glass, transparent plastic, or the like, and the flexible substrate may be made of a polymer material such as Polyimide (PI), polyether sulfone (PES), Polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyarylate (PAR), glass Fiber Reinforced Plastic (FRP), or the like. In the embodiment of the present application, the substrate 11 is preferably made of glass.

In some embodiments, the substrate 1 further includes a Thin Film Transistor (TFT) array layer 12, and the TFT array layer 12 is stacked on the substrate 11.

In some embodiments, the plurality of sub-pixel regions 10 further includes a red sub-pixel region 102 and a green sub-pixel region 103, and correspondingly, the sub-pixel unit 5 in the red sub-pixel region 102 is a red sub-pixel unit 52, and the sub-pixel unit 5 in the green sub-pixel region 103 is a green sub-pixel unit 53.

In some embodiments, the first electrode layer 2 is an anode layer, the second electrode layer 6 is a cathode layer, the first electrode layer 2 and the second electrode layer 6 respectively include a transparent conductive film, and the material of the transparent conductive film may be an Indium Tin Oxide (ITO) film, an aluminum-doped zinc oxide film, a carbon nanotube transparent conductive film, a Tin dioxide transparent conductive film, or the like.

In some embodiments, the material of the blue compensation pattern 3 is a host material doped with rare earth ions, the host material is at least one of halide, oxide, oxyhalide, sulfur-containing compound and sulfur oxide, and the rare earth ions are Er³⁺、Tm³⁺、Dy³⁺、Ho³⁺、Eu³⁺And Tb³⁺At least one of (1). In the embodiment of the application, the preferable matrix material is sodium yttrium tetrafluoride (NaYF)₄) The doped rare earth ion is Er³⁺。

In some embodiments, as shown in fig. 3, each of the blue light compensation patterns 3 is attached to the edge of the first electrode 21 at the bottom of the adjacent blue sub-pixel unit 51.

In some embodiments, as shown in fig. 4, each of the blue light compensation patterns 3 is respectively conducted to the adjacent blue sub-pixel units 51.

In some embodiments, the pixel defining layer 4 is made of SiN_xAnd silicon oxide SiO_xAt least one of, for example: the pixel definition layer is made of SiN_x. The adjacent sub-pixel regions 10 are separated by the banks 41.

In some embodiments, the display panel further includes a plurality of spacers 7 distributed in an array, each of the spacers 7 is disposed on each of the banks 41, and the width of the spacers 7 is not greater than the width of the banks 41, so that the spacers 7 avoid the sub-pixel regions 10. The purpose of the spacer 7 is to: in the evaporation process, a certain gap is ensured between the substrate 1 and the FMM, so that the FMM is prevented from damaging a display element on the substrate 1.

In some embodiments, each of the sub-pixel units 5 includes a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer, which are sequentially stacked, and the light emitting layers of the sub-pixel units of different colors are made of different materials.

In some embodiments, the second electrode layer 6 is disposed on the whole surface of each sub-pixel unit 5 and each spacer 7.

In some embodiments, the display panel further comprises: and the packaging layer 8 is arranged on the second electrode layer 6. The packaging layer 8 has the function of blocking water and oxygen so as to prevent components in the display panel from being rapidly aged in a water and oxygen environment and further influence the display quality of the display panel.

The encapsulation layer 8 includes a first inorganic layer 81, an organic layer 82, and a second inorganic layer 83 stacked in this order. The first inorganic layer 81 encloses the second electrode layer 6, each of the sub-pixel units 5, and the pixel defining layer 4. The first inorganic layer 81 and the second inorganic layer 83 have the same cross-sectional length, the organic layer 82 has a cross-sectional length less than that of the first (second) inorganic layer, and the second inorganic layer 83 encapsulates the organic layer 82.

The first inorganic layer 81 and the second inorganic layer 83 are made of silicon nitride (SiN)_x) Silicon oxide (SiO)_x) And alumina (Al)₂O₃) The material of the organic layer 82 is at least one of polymethyl methacrylate and hexamethyldisiloxane. The thicknesses of the first inorganic layer 81 and the second inorganic layer 83 are 0.5 to 1.5 micrometers, respectively, and the thickness of the organic layer 82 is 4.0 to 12.0 micrometers.

For example: the first inorganic layer 81 and the second inorganic layer 83 are both made of SiN_xThe thickness of the first inorganic layer 81 and the second inorganic layer 83 are both 0.8 μm; the organic layer 82 is made of polymethyl methacrylate, and the thickness of the organic layer 82 is 10.0 micrometers.

It should be noted that the display panel further includes a color film layer, a touch layer, a polarizer, a protective cover plate, and other common structures in the existing OLED display panel, and can be set by itself according to actual needs.

For example: the display panel further comprises a touch layer, a polaroid and a protective cover plate, wherein the touch layer is arranged on the packaging layer in a stacked mode, the polaroid is arranged on the touch layer in a stacked mode, the protective cover plate is arranged on the polaroid in a stacked mode, and the protective cover plate and the substrate are arranged in an opposite mode.

For example: the display panel further comprises a color film layer, the color film layer is arranged on the packaging layer, the color film layer comprises a plurality of color filter layers and light shading layers, the color filter layers correspond to the sub-pixel units, the light shading layers are arranged between the adjacent color filter layers, and the color filter layers corresponding to the colors of the sub-pixel units are arranged above the sub-pixel units in different colors.

In a second aspect, an embodiment of the present application provides a method for manufacturing a display panel, which is used to manufacture the display panel described in the first aspect, and as shown in fig. 5, the method includes the following steps:

s1, providing a substrate, and predefining a plurality of sub-pixel regions on the substrate, wherein the plurality of sub-pixel regions include a blue sub-pixel region.

In some embodiments, the substrate includes a substrate and a TFT array layer arranged in a stack, that is: the corresponding display panel is an Active Matrix OLED (AMOLED) display panel. The TFT array layer is prepared by adopting a deposited film and a photoetching process or an electronic printing process, and the deposited film and the photoetching process are conventional technical means in the field, and are not described again.

S2, preparing and forming a patterned first electrode layer on the substrate, where the first electrode layer includes a plurality of first electrodes distributed in an array, and an opening region is formed between each adjacent first electrodes.

Specifically, a patterned first electrode layer is formed on the substrate by a deposition film combined with a photolithography process or an electronic printing process.

And S3, respectively preparing and forming a blue light compensation pattern in each opening area adjacent to the predefined blue sub-pixel area, wherein the blue light compensation pattern is used for absorbing light with a wavelength larger than that of the blue light and converting the light into the blue light.

Specifically, an FMM is used to form a blue light compensation pattern in each of the opening regions adjacent to the predefined blue sub-pixel region by an evaporation process.

S4, preparing and forming a patterned pixel defining layer on the substrate, where the pixel defining layer includes a plurality of banks distributed in an array, each of the banks covers each of the opening regions, a gap region between adjacent banks is defined as a sub-pixel region, and a bottom of each of the sub-pixel regions is a first electrode.

Specifically, a patterned pixel defining layer is formed on the substrate by a deposition film combined with a photolithography process or an electronic printing process.

In some embodiments, a spacer is formed on each of the banks by depositing a thin film in combination with a photolithography process or an electronic printing process.

And S5, preparing and forming a sub-pixel unit in each sub-pixel region, and connecting the blue sub-pixel unit in the blue sub-pixel region with each adjacent blue light compensation pattern.

In some embodiments, a FMM is used to sequentially form a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer on the first electrode of each of the sub-pixel regions by evaporation.

In some embodiments, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer are sequentially printed on the first electrode of each of the sub-pixel regions by using an electron printing process.

In addition, a solution film forming method can be adopted to prepare and form a sub-pixel unit in each sub-pixel region, and the solution film forming method is a conventional technical means in the field and is not described herein again.

And S6, preparing and forming a second electrode layer on each sub-pixel unit.

Specifically, a second electrode layer is formed on each sub-pixel unit by an evaporation process or an electronic printing process.

In some embodiments, an entire second electrode layer is formed on each of the sub-pixel units and each of the spacers by an evaporation process using an open mask (open mask).

In some embodiments, the method for manufacturing a display panel further includes:

and S7, preparing and forming a packaging layer on the second electrode layer.

In some embodiments, a chemical vapor deposition process or an electronic printing process, preferably an inkjet printing process, is used to form an encapsulation layer on the second electrode layer.

In some embodiments, the encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer sequentially stacked, and the first inorganic layer and the second inorganic layer are made of SiN_xOxygen SiO_xAnd Al₂O₃The organic layer is made of at least one of polymethyl methacrylate and hexamethyl dimethyl siloxane. Correspondingly, a first inorganic layer, an organic layer and a second inorganic layer are sequentially formed on the second electrode layer by adopting a chemical vapor deposition process or an electronic printing process.

It should be noted that the display panel may further include a color film layer, a touch layer, a polarizer, a protective cover plate, and other structures commonly found in the existing OLED display panel, and the color film layer, the touch layer, the polarizer, the protective cover plate, and the like are correspondingly prepared and formed by adopting conventional technical means in the art.

In a third aspect, an embodiment of the present application provides a display device, which includes the display panel described in the first aspect.

Specifically, the display device may be any product or component having a display function, such as a mobile phone, a computer, a digital camera, a digital video camera, a game console, an audio reproducing device, an information terminal, an intelligent wearable device, an intelligent weighing electronic scale, a vehicle-mounted display, a television, and the like, wherein the intelligent wearable device may be an intelligent bracelet, an intelligent watch, an intelligent glasses, and the like.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The flexible display panel, the flexible display panel and the flexible display device provided by the embodiment of the application are described in detail above. The principle and the implementation of the present application are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel, comprising:

And the second electrode layer is arranged on each sub-pixel unit.

2. The display panel of claim 1, wherein the blue compensation pattern is made of a host material doped with a rare earth ion, the host material is at least one of a halide, an oxide, an oxyhalide, a sulfur-containing compound, and a sulfur oxide, and the rare earth ion is Er³⁺、Tm³⁺、Dy³⁺、Ho³⁺、Eu³⁺And Tb³⁺At least one of (1).

3. The display panel of claim 1, wherein each of the blue light compensation patterns is attached to an edge of the first electrode at the bottom of the adjacent blue sub-pixel unit; or, each blue light compensation pattern is respectively conducted with the adjacent blue sub-pixel units.

4. The display panel according to claim 1, characterized in that the display panel further comprises: and the packaging layer is arranged on the second electrode layer.

5. The display panel of claim 4, wherein the encapsulation layer comprises: the organic solar cell comprises a first inorganic layer, an organic layer and a second inorganic layer which are sequentially stacked, wherein the first inorganic layer and the second inorganic layer are made of at least one of silicon nitride, silicon oxide and aluminum oxide, and the organic layer is made of at least one of polymethyl methacrylate and hexamethyl dimethyl silicon ether.

6. The display panel according to claim 5, wherein the first inorganic layer has a thickness of 0.5 to 1.5 micrometers, the second inorganic layer has a thickness of 0.5 to 1.5 micrometers, and the organic layer has a thickness of 4.0 to 12.0 micrometers.

7. A preparation method of a display panel is characterized by comprising the following steps:

and preparing and forming a second electrode layer on each sub-pixel unit.

8. The method for manufacturing a display panel according to claim 7, further comprising the steps of: and preparing and forming an encapsulation layer on the second electrode layer.

9. The method for manufacturing a display panel according to claim 8, wherein the step of forming an encapsulation layer on the second electrode layer comprises: a first inorganic layer, an organic layer and a second inorganic layer are sequentially formed on the second electrode layer, the first inorganic layer and the second inorganic layer are made of at least one of silicon nitride, silicon oxide and aluminum oxide, and the organic layer is made of at least one of polymethyl methacrylate and hexamethyl dimethyl siloxane.

10. A display device characterized by comprising the display panel as set forth in any one of claims 1 to 6.