OLED display panel and preparation method therefor, and display apparatus

Abstract

The present application belongs to the technical field of display. Specifically disclosed are an OLED display panel and a preparation method therefor, and a display apparatus. The display panel sequentially comprises, from bottom to top, a base substrate, a pixel unit layer, a thin-film encapsulation layer and a micro-lens layer, wherein the micro-lens layer comprises a plurality of micro-lens protrusions distributed in an array on the thin-film encapsulation layer, and a planarization layer covering all the micro-lens protrusions, the refractive index of each micro-lens protrusion is greater than the refractive index of the planarization layer, the distance between any two adjacent micro-lens protrusions is 0-20 μm, and light-emitting units in the pixel unit layer correspond on a one-to-one basis to micro-lens units formed by the plurality of micro-lens protrusions. In the present application, by means of the micro-lens protrusions, more large-angle light can be converted into small-angle light by means of refraction and reflection, such that the light is emitted from the upper side of the micro-lens layer, and the light emission efficiency of the OLED display panel is greatly improved without changing front-view light paths of the light-emitting units, thereby reducing the power consumption and prolonging the service life.

Description

OLED display panel, manufacturing method thereof, and display device

[0001] This application claims priority to the patent application submitted to the State Intellectual Property Office of China on December 29, 2023, with application number 202311852120.X, and invention name "An OLED display panel, its preparation method, and display device". Technical Field

[0002] The present application belongs to the field of display technology, and specifically relates to an OLED display panel, a preparation method thereof, and a display device. Background Art

[0003] With the continuous development of display technology, display panel manufacturing technology has also become more mature. Existing display panels mainly include liquid crystal display panels (LCD), plasma display panels (PDP), and organic light emitting diode (OLED). Among them, OLED display panels have many advantages over other display panels, such as being lighter, thinner, brighter, with a wider viewing angle, lower power consumption, faster response, higher clarity, better flexibility, and higher luminous efficiency. Therefore, OLED display panels have gradually become the mainstream display technology.

[0004] In conventional OLED display panels, due to the differences in optical properties of materials in different functional layers, light will be lost inside the device in the form of total reflection. Only about 20% to 30% of the light emitted by the OLED organic light-emitting layer can be emitted through the glass. The vast majority of light is lost in the organic material film and the glass substrate in a waveguide mode. For example, Fresnel reflection occurs between the film layers (when the line of sight is perpendicular to the surface, the reflection is weak, and when the line of sight is not perpendicular to the surface, the smaller the angle, the more obvious the reflection). This light is lost, which in turn affects the light output efficiency and display effect of the OLED display panel.

[0005] To enhance the light extraction efficiency and display quality of OLED display panels, existing technologies typically incorporate microlenses. This prevents some light emitted by multiple sub-pixels from being totally reflected after reaching the encapsulation layer, preventing this light from exiting and being lost within the device or emitted from the edges. This results in the microlenses focusing light, thereby improving the front-facing light extraction efficiency and display quality of the OLED display panel to a certain extent. However, at wide viewing angles, the microlenses focus the brightness of each pixel unit to varying degrees, resulting in varying degrees of light attenuation from each pixel unit. Consequently, OLED display panels still experience varying degrees of low light extraction efficiency, resulting in light waste and high energy consumption.

[0006] In view of this, this application is hereby made.

[0007] Application Contents

[0008] The purpose of this application is to overcome the shortcomings of the above-mentioned prior art and provide an OLED display panel and its preparation method and display device, which are mainly used to solve the problems that the existing OLED display panels still have low light extraction efficiency, light waste, and high energy consumption after using microlenses.

[0009] The purpose of this application is to solve the problem through the following technical solutions:

[0010] In one aspect, the present application provides a method for preparing an OLED display panel, the method comprising the following steps:

[0011] S1. Provide a substrate;

[0012] S2. forming a pixel unit layer on the base substrate, wherein the pixel unit layer includes a plurality of light-emitting units arranged in an array;

[0013] S3, forming a thin film encapsulation layer on the pixel unit layer;

[0014] S4. Forming a microlens layer on the thin film encapsulation layer by a photolithography process, wherein the microlens layer includes a plurality of microlens convex bodies evenly distributed on the thin film encapsulation layer and a planarization layer covering the microlens convex bodies, and the light-emitting units are arranged in a one-to-one correspondence with the microlens units composed of the plurality of microlens convex bodies.

[0015] Preferably, the method further comprises the following steps:

[0016] S5, forming a polarizer on the microlens layer;

[0017] S6. Forming a cover window on the polarizer.

[0018] In one embodiment, the plurality of microlens convex bodies are distributed in an array on the thin film encapsulation layer, and the microlens convex bodies in adjacent rows are aligned or staggered.

[0019] In one embodiment, the microlens convex body is mainly made of acrylic resin and / or epoxy acrylic resin and / or epoxy resin. Of course, other materials that can be photolithographically processed are also included, which are not listed here one by one.

[0020] In one embodiment, the microlens convex body contains scattering particles with a particle size of 1 nm to 100 nm, and the refractive index of the scattering particles is greater than or equal to 1.7. Preferably, the scattering particles are inorganic particles, specifically, one or more of ZnO, TiO2, ZnS, ZnSe, ZrO2, and diamond.

[0021] On the other hand, the present application provides an OLED display panel, comprising at least a base substrate, a pixel unit layer, a thin film encapsulation layer and a microlens layer arranged in sequence from the bottom, characterized in that the microlens layer includes a plurality of microlens convex bodies evenly distributed on the thin film encapsulation layer and a planarization layer covering the microlens convex bodies, and the refractive index of each of the microlens convex bodies is greater than the refractive index of the planarization layer, and the spacing between any two adjacent microlens convex bodies is 0 to 20 μm, and the light-emitting units in the pixel unit layer are arranged in a one-to-one correspondence with the microlens units composed of multiple microlens convex bodies.

[0022] In one embodiment, the height of the microlens convex body is less than or equal to the height of the planarization layer. Preferably, each of the microlens convex body has a height of 0.1 μm to 20 μm and a length of 0.5 μm to 10 μm.

[0023] In one embodiment, the refractive index of the microlens convex body is greater than the refractive index of the planarization layer. Preferably, the refractive index of the planarization layer is 1.4 to 1.48, and the refractive index of the microlens convex body is 1.65 to 1.8.

[0024] In one embodiment, the orthographic projection area of ​​the multiple microlens convex bodies in each microlens unit on the base substrate overlaps the orthographic projection area of ​​one light-emitting unit. In this configuration, the microlens unit transmits light emitted by the corresponding light-emitting unit. The orthographic projection area of ​​the multiple microlens convex bodies on the display substrate covering the orthographic projection area of ​​one light-emitting unit can increase the flux of output parallel light, thereby more efficiently utilizing the light-emitting area of ​​each light-emitting unit.

[0025] In one embodiment, the cross-sectional shape of the microlens convex body is semicircular, triangular, and / or semi-rounded rectangular. When the cross-sectional shape of the microlens convex body is semicircular or triangular, the orthographic projection of the microlens convex body is circular; when the cross-sectional shape of the microlens convex body is semi-rounded rectangular, the orthographic projection of the microlens convex body is semi-rounded rectangular.

[0026] In one embodiment, the pixel unit layer includes, from bottom to top, a first insulating buffer layer, a second insulating buffer layer, a passivation layer, a driving transistor, a pixel defining layer, and a light-emitting unit. The driving transistor is disposed on the first insulating buffer layer, the second insulating buffer layer, and the passivation layer and is arranged one-to-one with the light-emitting unit. In this arrangement, the first insulating buffer layer and the second insulating buffer layer flatten the surface of the layer where the driving transistor is located.

[0027] The driving transistor includes an active layer, a gate located on the active layer, and a source electrode and a drain electrode respectively contacting the active layer, the active layer is provided on a first insulating buffer layer, and the gate is provided on a second insulating buffer layer;

[0028] The pixel definition layer is disposed around each light-emitting unit to define the position of each light-emitting unit to avoid crosstalk caused by light emitted by light-emitting functional layers of different light-emitting units;

[0029] The light-emitting unit includes a first electrode layer, a light-emitting functional layer, and a second electrode layer which are sequentially arranged in a direction away from the base substrate, and the first electrode layer is connected to the drain.

[0030] In one embodiment, the thin film encapsulation layer includes, from bottom to top, a first inorganic layer, an organic layer, and a second inorganic layer stacked in sequence, and the first inorganic layer is disposed on the second electrode layer.

[0031] In one embodiment, the OLED display panel is prepared by the above method.

[0032] In a third aspect, the present application provides a display device, which uses the above-mentioned OLED display panel.

[0033] Compared with the prior art, this application has the following beneficial effects:

[0034] 1. The OLED display panel provided by the present application is mainly composed of a substrate, a pixel unit layer, a thin film encapsulation layer and a microlens layer. The microlens layer includes a plurality of microlens convex bodies arrayed on the thin film encapsulation layer and a flattening layer covering all the microlens convex bodies, and the refractive index of the microlens convex bodies is greater than the refractive index of the flattening layer. The light-emitting unit in the pixel unit layer is arranged in a one-to-one correspondence with the microlens unit composed of the plurality of microlens convex bodies, that is, the principle of the convex lens is used to make the inclined light refract and converge at the interface between the microlens convex body and the flattening layer. The plurality of microlens convex bodies correspond to one light-emitting unit, thereby converging the inclined light emitted by the light-emitting unit with a large viewing angle into a small viewing angle, reducing the chance of total reflection of the light, improving the light extraction efficiency, and thus improving the light extraction effect of the OLED display panel, so that the brightness of the OLED display panel at the normal viewing angle is effectively improved. Therefore, under the same brightness conditions, due to the high light extraction efficiency, the power consumption is low, and it is more energy-saving.

[0035] 2. The OLED display panel provided herein features an array of multiple microlenses with a pitch of 0 to 20 μm directly above each light-emitting unit, making it easy to form and reducing manufacturing complexity. Furthermore, the high-refractive index film layer is formed into microlenses, which alleviates residual stress in the high-refractive index film layer. This avoids peeling failure of the encapsulation layer during reliability testing of the MLA structure with a full-surface high-refractive index film, thereby improving the stability and service life of the OLED display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the application.

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] FIG1 is a schematic cross-sectional view of an OLED display panel in Example 1 of the present application;

[0039] FIG2 is a schematic diagram of a partial cross-sectional structure of a microlens convex body having a triangular cross-section in Example 1 of the present application;

[0040] FIG3 is a schematic diagram of a partial cross-sectional structure of a microlens in Example 1 of the present application in which the convex body has a semi-elliptical cross-section;

[0041] FIG4 is a schematic diagram showing the positional relationship between the microlens convex body and the light-emitting unit in Example 1 of the present application;

[0042] FIG5 is a schematic diagram of another positional relationship between the microlens convex body and the light-emitting unit in Example 1 of the present application

[0043] FIG6 is a schematic diagram of a partial cross-sectional structure of a microlens convex body having a semi-rounded rectangular cross section in Example 2 of the present application;

[0044] FIG7 is a schematic diagram showing the positional relationship between the microlens convex body and the light-emitting unit in Example 2 of the present application;

[0045] FIG8 is a schematic diagram showing another positional relationship between the microlens convex body and the light-emitting unit in Example 2 of the present application.

[0046] Among them: 10 is the base substrate; 20 is the pixel unit layer; 21 is the first insulating buffer layer; 22 is the second insulating buffer layer; 23 is the passivation layer; 24 is the driving transistor; 24-1 is the active layer; 24-2 is the gate; 24-3 is the source; 24-4 is the drain; 25 is the pixel definition layer; 26 is the light-emitting unit; 26-1 is the first electrode layer; 26-2 is the light-emitting functional layer; 26-3 is the second electrode layer; 30 is the thin film encapsulation layer; 31 is the first inorganic layer; 32 is the organic layer; 33 is the second inorganic layer; 40 is the touch electrode layer; 50 is the microlens layer; 51 is the microlens convex body; 52 is the planarization layer; 60 is the polarizer; 70 is the cover window. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

[0048] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0049] Example 1

[0050] Referring to Figures 1 to 5, an embodiment of the present application provides an OLED display panel, which includes, from the bottom up, at least a base substrate 10, a pixel unit layer 20, a thin film encapsulation layer 30, and a microlens layer 50. The microlens layer 50 includes a plurality of microlens protrusions 51 evenly distributed on the thin film encapsulation layer 30 and a planarization layer covering all of the microlens protrusions 51. The microlens protrusions 51 are distributed throughout the thin film encapsulation layer 30. The light-emitting units 26 in the pixel unit layer 20 are arranged in a one-to-one correspondence with the microlens units composed of the plurality of microlens protrusions 51, and the refractive index of each microlens protrusion 51 is greater than the refractive index of the planarization layer 52.

[0051] Specifically, in the embodiment of the present application, the base substrate 10 is located at the bottom layer of the display panel. The base substrate 10 can be an insulating substrate made of glass, quartz, transparent plastic, or a metal substrate made of stainless steel. The transparent plastic substrate can be formed from any one of polyimide resin, acrylic resin, polyacrylate resin, polycarbonate resin, or polyether resin. Furthermore, the base substrate 10 can be flexible, stretchable, foldable, bendable, and / or rollable, and can be customized according to actual needs.

[0052] In the embodiment of the present application, the pixel unit layer 20 includes, from bottom to top, a first insulating buffer layer 21, a second insulating buffer layer 22, a passivation layer 23, a driving transistor 24, a pixel defining layer 25, and a light-emitting unit 26. The driving transistor 24 is provided on the first insulating buffer layer 21, the second insulating buffer layer 22, and the passivation layer 23 and is arranged one-to-one with the light-emitting unit 26. Among them, the material of the first insulating buffer layer 21 and the second insulating buffer layer 22 can be an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, or an organic insulating material such as polyimide, polyphthalimide, polyphthalamide, acrylic resin, benzocyclobutene, or phenolic resin. The specific application is not limited thereto, and its purpose is to flatten the surface of the layer where the driving transistor 24 is located. The passivation layer 23 is used to protect the structure of other layers below it and slow down the corrosion rate.

[0053] Specifically, in the embodiment of the present application, the driving transistor 24 includes an active layer 24-1, a gate 24-2 located on the active layer 24-1, and a source 24-3 and a drain 24-4, each in contact with the active layer 24-1. The active layer 24-1 is disposed on the first insulating buffer layer 21, and the gate 24-2 is disposed on the second insulating buffer layer 22. A pixel defining layer 25 surrounds each light-emitting unit 26, defining the position of each light-emitting unit 26 to prevent crosstalk between the light emitted by different light-emitting units 26. The light-emitting units 26 include a first electrode layer 26-1, a light-emitting functional layer 26-2, and a second electrode layer 26-3, arranged in sequence away from the base substrate 10. The first electrode layer 26-1 is connected to the drain 24-4. The light-emitting units 26 include a red light-emitting unit 26 (R), a green light-emitting unit 26 (G), and a blue light-emitting unit 26 (B), each capable of emitting red, green, or blue light, respectively.

[0054] Furthermore, the first electrode layer 26-1 can be a laminated structure formed of ITO / Ag / ITO materials; the material of the second electrode layer 26-3 can include Ag and / or Mg. Specifically, in this embodiment, the first electrode layer 26-1 is a laminated structure formed of ITO material; the material of the second electrode layer 26-3 is a single-layer structure of Ag. The light-emitting functional layer 26-2 can be a small molecule single-layer or multi-layer OLED device, a polymer single-layer or multi-layer OLED device, and can be selected in practice according to the requirements of each product for luminous brightness and luminous efficiency. In this embodiment, an organic light-emitting diode thin film device OLED is used as an example. The OLED can include a stacked electron injection layer (EIL), an electron transport layer (ETL), an electron blocking layer, a hole transport layer (HTL), a hole injection layer (HIL) and / or a hole blocking layer.

[0055] In the embodiment of the present application, the thin film encapsulation layer 30 includes a first inorganic layer 31, an organic layer 32, and a second inorganic layer 33 stacked sequentially from bottom to top, with the first inorganic layer 31 disposed on the second electrode layer 26-3. This sequential stacking ensures smoothness between the first inorganic layer 31, the organic layer 32, and the second inorganic layer 33, and also prevents defects in the second inorganic layer 33 from propagating into the first inorganic layer 31.

[0056] The first inorganic layer 31 and the second inorganic layer 33 may be made of the same or different inorganic materials. Specifically, the inorganic material is silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiOx N y ), one or more of ZnSe, ZnO, Sb2O3, Al2O3, In2O3 or SnO2, where x and y are in the range of 1 to 5. The first inorganic layer 31 and the second inorganic layer 33 are both 40 nm to 1000 nm thick and have a refractive index of 1.41 to 2.0.

[0057] In the embodiment of the present application, the material of the organic layer 32 is acrylate or epoxy polymer, the thickness of which is 0.2μm to 15μm, and the refractive index is 1.4 to 1.65. The organic layer 32 can block the penetration of external moisture or oxygen, and can ensure the light extraction rate by blocking the defects of the inorganic layer and flattening the inorganic layer at the same time.

[0058] It should be noted that, in the embodiment of the present application, the microlens layer 50 includes a plurality of microlens convex bodies 51 distributed in an array on the thin film encapsulation layer 30 and a planarization layer 52 covering all the microlens convex bodies 51, and the height of the microlens convex bodies 51 is less than or equal to the height of the planarization layer 52. At the same time, the spacing between any two adjacent microlens convex bodies 51 is 0 to 20 μm, and a plurality of microlens convex bodies 51 constitute a microlens unit.

[0059] Since the light emitted by the light-emitting unit 26 is light with a certain divergence angle, light at a large angle has a high probability of being totally reflected or dissipated after multiple refractions, which seriously affects the light extraction efficiency of the OLED display panel. To this end, in the embodiment of the present application, the orthographic projection area of ​​the multiple microlens convex bodies 51 in each microlens unit on the substrate 10 is set to just cover the orthographic projection area of ​​one light-emitting unit 26, as shown in Figures 4 and 5. Preferably, the spacing between two adjacent microlens convex bodies 51 is 0, that is, they are arranged in an array of multiple rows and columns; multiple microlens convex bodies 51 are arranged in multiple rows, and the microlens convex bodies 51 in adjacent rows are aligned, and four microlens convex bodies 51 are selected from adjacent rows to form a square structure, as shown in Figure 4; or multiple microlens convex bodies 51 are arranged in multiple rows, and the microlens convex bodies 51 in adjacent rows are staggered, and four microlens convex bodies 51 are selected from adjacent rows to form a parallelogram structure, as shown in Figure 5. Such an arrangement can increase the flux of the output parallel light, thereby more efficiently utilizing the light-emitting area of ​​each light-emitting unit 26. That is to say, the present application can convert more large-angle light into small-angle light through refraction and reflection through the specially arranged microlens convex body 51, so that it is emitted from above the microlens layer 50, and while not changing the positive viewing angle light path of the light-emitting unit 26, it greatly increases the light output efficiency of the OLED display panel, thereby reducing the power consumption of the OLED display panel and extending its service life.

[0060] Preferably, in the embodiment of the present application, the refractive index of the planarization layer 52 is generally set between 1.4 and 1.48, and the refractive index of the microlens convex body 51 is 1.65 to 1.8. Furthermore, preferably, the microlens convex body 51 contains scattering particles with a particle size of 1 nm to 100 nm, and the refractive index of the scattering particles is greater than or equal to 1.7. The scattering particles are inorganic particles, specifically, one or more of ZnO, TiO2, ZnS, ZnSe, ZrO2, and diamond.

[0061] In the embodiment of the present application, the microlens convex body 51 is mainly made of acrylic resin and / or epoxy acrylic resin, and the cross-section of the microlens convex body 51 is triangular (the corresponding microlens convex body 51 is a cone), as shown in Figure 2; or the cross-section of the microlens convex body 51 is semi-elliptical (a special case of a semicircle), as shown in Figure 3. When the cross-section of the microlens convex body 51 is triangular or semi-elliptical, the shape of its corresponding orthographic projection is circular. Preferably, the height of each microlens convex body 51 is 0.1μm to 20μm, and the length is 0.5μm to 20μm. More preferably, the distance between two adjacent microlens convex bodies 51 is consistent with their length.

[0062] Preferably, the OLED display panel in the embodiment of the present application further includes a touch electrode layer 40 disposed between the thin film encapsulation layer 30 and the microlens layer 50. The touch electrode layer 40 can be configured as a grid-like electrode, with the grid lines of the grid-like electrode located in the gaps between the light-emitting units 26. More preferably, the OLED display panel can further include a polarizer 60 disposed on the microlens layer 50 and a cover window 70 disposed on the polarizer 60. The cover window 70 primarily protects the OLED display panel from external interference and can be formed of a single layer or multiple layers.

[0063] In addition, the present application also provides a method for preparing an OLED display panel, the preparation method process of which is as follows:

[0064] 1) Providing a base substrate 10;

[0065] 2) forming a pixel unit layer 20 on the base substrate 10 in step 1), wherein the pixel unit layer 20 includes a plurality of light emitting units 26 arranged in an array;

[0066] 3) forming a thin film encapsulation layer 30 on the pixel unit layer 20 in step 2);

[0067] 4) forming a microlens layer 50 on the thin film encapsulation layer 30 by a photolithography process. The microlens layer 50 includes a plurality of microlens protrusions 51 evenly distributed on the thin film encapsulation layer 30 and a planarization layer 52 covering the microlens protrusions 51. The light-emitting units 26 are arranged in a one-to-one correspondence with the microlens units composed of the plurality of microlens protrusions 51, and the spacing between any two adjacent microlens protrusions 51 is 0 to 20 μm.

[0068] 5) forming a polarizer 60 on the microlens layer 50 in step 4);

[0069] 6) A cover window 70 is formed on the polarizer 60 in step 5).

[0070] In addition, this embodiment also provides a display device, which uses the OLED display panel described above.

[0071] Example 2

[0072] Referring to Figures 6 to 8, this embodiment provides another structure of an OLED display panel. This structure differs from the OLED display panel in Example 1 only in the cross-sectional shape of the microlens convex body 51. In this embodiment, the cross-section of the microlens convex body 51 is a semi-circular rectangle, so its corresponding orthographic projection is also a rounded rectangle. Of course, in this embodiment, multiple microlens convex bodies 51 are also arranged on the thin film encapsulation layer 30. The multiple microlens convex bodies 51 are arranged in multiple rows, and the microlens convex bodies 51 in adjacent rows are aligned, as shown in Figure 7; or the microlens convex bodies 51 in adjacent rows are staggered, as shown in Figure 8. Specifically, the light-emitting area of ​​each light-emitting unit 26 can be effectively utilized according to actual needs.

[0073] The foregoing description is merely a detailed description of the present invention, intended to enable those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0074] It should be understood that the present application is not limited to the above-described contents, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for preparing an OLED display panel, characterized in that, The preparation method includes the following steps: S1. Provide a substrate (10); S2. Form a pixel unit layer (20) on the substrate (10), and the pixel unit layer (20) includes a plurality of light-emitting units (26) arranged in an array; S3. Form a thin film encapsulation layer (30) on the pixel unit layer (20); S4. Form a microlens layer (50) on the thin film encapsulation layer (30) by photolithography. The microlens layer (50) includes a plurality of microlens protrusions (51) uniformly distributed on the thin film encapsulation layer (30) and a planarization layer (52) covering the microlens protrusions (51). The light-emitting units (26) are arranged in one-to-one correspondence with microlens units composed of a plurality of microlens protrusions (51).

2. The manufacturing method of the OLED display panel according to claim 1, characterized in that, The plurality of microlens protrusions (51) are arranged in an array on the thin film encapsulation layer (30), and the microlens protrusions (51) in adjacent rows are arranged in alignment or stagger.

3. The manufacturing method of the OLED display panel according to claim 1, wherein, The microlens protrusions (51) are mainly made of acrylic resin and / or epoxy acrylate resin and / or epoxy resin.

4. The manufacturing method of the OLED display panel according to claim 1, characterized in that, The microlens protrusions (51) contain scattering particles with a particle size of 1 nm to 100 nm, and the refractive index of the scattering particles is greater than or equal to 1.

7.

5. An OLED display panel, which is prepared by the preparation method of the OLED display panel according to any one of claims 1 to 4, and the OLED display panel includes a substrate (10), a pixel unit layer (20), a thin film encapsulation layer (30), and a microlens layer (50) which are at least sequentially arranged from bottom to top, and is characterized in that, The microlens layer (50) includes a plurality of microlens protrusions (51) uniformly distributed on the thin film encapsulation layer (30) and a planarization layer (52) covering the microlens protrusions (51). The refractive index of each microlens protrusion (51) is greater than that of the planarization layer (52). Meanwhile, the distance between any two adjacent microlens protrusions (51) is 0 to 20 μm. The light-emitting units (26) in the pixel unit layer (20) are arranged in one-to-one correspondence with microlens units composed of a plurality of microlens protrusions (51).

6. The OLED display panel according to claim 5, wherein The orthographic projection area of the plurality of microlens protrusions (51) in each microlens unit on the substrate (10) covers the orthographic projection area of one light-emitting unit (26).

7. The OLED display panel according to claim 5, characterized in that, The cross-sectional shape of the microlens protrusions (51) is semicircular, triangular, and / or semi-circular corner rectangle.

8. The OLED display panel according to claim 5, wherein, The pixel unit layer (20) sequentially includes a first insulating buffer layer (21), a second insulating buffer layer (22), a passivation layer (23), a driving transistor (24), a pixel defining layer (25), and a light-emitting unit (26) from bottom to top. The driving transistor (24) penetrates through the first insulating buffer layer (21), the second insulating buffer layer (22), and the passivation layer (23) and is arranged in one-to-one correspondence with the light-emitting unit (26); Wherein, the driving transistor (24) includes an active layer (24-1), a gate (24-2) located on the active layer (24-1), and a source electrode (24-3) and a drain electrode (24-4) respectively in contact with the active layer (24-1). The active layer (24-1) is disposed on the first insulating buffer layer (21), and the gate (24-2) is disposed on the second insulating buffer layer (22); The pixel defining layer (25) is disposed around each light-emitting unit (26) to define the position of each light-emitting unit (26); The light-emitting unit (26) includes a first electrode layer (26-1), a light-emitting functional layer (26-2), and a second electrode layer (26-3) that are sequentially arranged in a direction away from the substrate (10), and the first electrode layer (26-1) is connected to the drain electrode (24-4).

9. The OLED display panel according to claim 8, wherein the first electrode layer (26-1) includes a stacked structure formed of ITO / Ag / ITO materials; and / or the material of the second electrode layer (26-3) includes at least one of Ag and Mg.

10. The OLED display panel according to claim 8, characterized in that, The light-emitting functional layer (26-2) includes one of a small molecule single-layer or multi-layer OLED device and a polymer single-layer or multi-layer OLED device.

11. The OLED display panel according to claim 8, wherein, The thin film encapsulation layer (30) includes a first inorganic layer (31), an organic layer (32), and a second inorganic layer (33) that are sequentially stacked, and the first inorganic layer (31) is disposed on the second electrode layer (26-3).

12. The OLED display panel according to claim 11, wherein The material of the first inorganic layer (31) includes at least one of silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), ZnSe, ZnO, Sb2O3, Al2O3, In2O3, SnO2, where the value ranges of x and y are 1 to 5; and / or The material of the second inorganic layer (33) includes at least one of silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), ZnSe, ZnO, Sb2O3, Al2O3, In2O3, SnO2, where the value ranges of x and y are from 1 to 5.

13. The OLED display panel according to claim 11, wherein the thickness of the first inorganic layer (31) is 40 nm to 1000 nm; and / or the thickness of the second inorganic layer (33) is 40 nm to 1000 nm; and / or the refractive index of the first inorganic layer (31) is 1.41 to 2.0; and / or the refractive index of the second inorganic layer (33) is 1.41 to 2.

0.

14. The OLED display panel according to claim 11, wherein the material of the organic layer (32) includes one of acrylate or epoxy polymers; and / or the thickness of the organic layer (32) is 0.2 μm to 15 μm; and / or the refractive index of the organic layer (32) is 1.4 to 1.

65.

15. The OLED display panel according to claim 5, wherein the refractive index of the planarization layer (52) is 1.4 to 1.48; and / or the refractive index of the microlens convex body (51) is 1.65 to 1.

8.

16. The OLED display panel according to claim 5, wherein, The OLED display panel further includes a touch control electrode layer (40) disposed between the thin film encapsulation layer (30) and the microlens layer (50), the touch control electrode layer (40) includes a grid-shaped electrode, and the grid lines of the grid-shaped electrode are located in the gaps between multiple light-emitting units (26).

17. A display device, characterized in that, The display device includes the OLED display panel according to any one of claims 5 to 16.

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