A display module and its manufacturing method, and a display panel.

Abstract

This invention relates to a display module, its fabrication method, and a display panel. The display module includes a light-emitting structure layer and a lens structure. The light-emitting structure layer includes a pixel unit layer with multiple pixel units and a color filter layer disposed on the pixel unit layer. The color filter layer has color conversion units corresponding one-to-one with the multiple pixel units. The lens structure is disposed on the light-emitting structure layer and has multiple lens units, each corresponding one-to-one with a color conversion unit. The lens units are formed using inorganic materials. Compared to existing lens structures formed using organic materials such as photoresist, the lens structure formed using inorganic materials has a higher refractive index, which allows the focal point of the lens structure to be closer to the light-emitting units (pixel units) of the light-emitting structure layer, thus improving light transmittance and enhancing the light efficiency of the display module.

Description

Technical Field

[0001] This invention belongs to the field of display technology, and particularly relates to a display module and its manufacturing method, and a display panel. Background Technology

[0002] With the continuous development of display panel technology, Organic Light-Emitting Diode (OLED) display devices have become a highly competitive and promising next-generation display structure due to their advantages such as all-solid-state structure, high brightness, wide viewing angle, fast response speed, and flexible display capability. Micro-OLED displays, as a commonly used OLED display device, are widely used. A lens structure is placed above the light-emitting structure layer with pixel units in a Micro-OLED display to improve the light emission effect. In related technologies, the lens structure is made of organic materials such as photoresist, which has a low refractive index, resulting in a certain reflectivity of the light emitted by the light-emitting structure layer, affecting the overall light emission effect of the product. Summary of the Invention

[0003] According to a first aspect of the present invention, a display module is provided, comprising:

[0004] The light-emitting structure layer includes a pixel unit layer having multiple pixel units and a color filter layer disposed on the pixel unit layer, wherein the color filter layer has color conversion units corresponding one-to-one with the multiple pixel units;

[0005] A lens structure is disposed on the light-emitting structure layer and has multiple lens units, each of which corresponds to a color conversion unit; wherein the lens units are formed of inorganic materials.

[0006] In some embodiments, the lens structure includes:

[0007] A lens body having a convex first surface;

[0008] An additional lens layer is added and attached to the first surface of the lens body, with the same shape as the first surface of the lens body.

[0009] In some embodiments, the material of the added lens layer is the same as the material of the lens body.

[0010] In some embodiments, the additional lens layer includes a first additional lens layer disposed on the lens body, a second additional lens layer disposed on the surface of the first additional lens layer, and a third additional lens layer disposed on the surface of the second additional lens layer.

[0011] In some embodiments, the refractive indices of the lens body, the first additional lens layer, the second additional lens layer, and the third additional lens layer are the same or increase sequentially.

[0012] In some embodiments, the thicknesses of the lens body, the first additional lens layer, the second additional lens layer, and the third additional lens layer decrease sequentially.

[0013] In some embodiments, a protective layer is provided between the light-emitting structure layer and the lens structure.

[0014] In some embodiments, the protective layer is made of one of Al2O3, ZnO, TiO2, ITO, and IZO; and / or,

[0015] The thickness of the protective layer is And / or,

[0016] The lens structure is made of SiNx; and / or,

[0017] The refractive index of the lens structure is greater than or equal to 1.88.

[0018] According to a second aspect of the present invention, a display panel is provided, including the display module as described above.

[0019] According to a third aspect of the present invention, a method for manufacturing a display module is provided, comprising:

[0020] A light-emitting structure layer is provided, the light-emitting structure layer including a pixel unit layer having multiple pixel units and a color filter layer disposed on the pixel unit layer, the color filter layer having color conversion units corresponding one-to-one with the multiple pixel units;

[0021] A lens structure is disposed on the light-emitting structure layer, the lens structure having multiple lens units, and the multiple lens units are disposed one-to-one with the color conversion unit; wherein, the lens units are formed of inorganic materials.

[0022] In some embodiments, the provision of a lens structure on the light-emitting structural layer includes:

[0023] An inorganic material layer is formed on the light-emitting structural layer;

[0024] The inorganic material layer is etched to form the lens structure.

[0025] In some embodiments, after forming an inorganic material layer on the light-emitting structural layer, the following is included:

[0026] An etching adhesive layer is formed on the surface of the inorganic material layer;

[0027] The etching adhesive layer is etched to form a transfer lens structure; the shape of the transfer lens structure is consistent with that of the lens structure.

[0028] The lens structure is formed by etching the inorganic material layer using a transfer method.

[0029] In some embodiments, the lens structure includes a lens body and an additional lens layer disposed on the surface of the lens body, wherein etching the inorganic material layer by transfer printing to form the lens structure includes:

[0030] The inorganic material layer is etched to form the lens body, and the lens body has a convex first surface.

[0031] In some embodiments, after forming the lens body, the method includes:

[0032] An additional lens layer is formed on the first surface of the lens body.

[0033] In some embodiments, the additional lens layer includes a first additional lens layer disposed on the lens body, a second additional lens layer disposed on the surface of the first additional lens layer, and a third additional lens layer disposed on the surface of the second additional lens layer, the method comprising:

[0034] A first additional lens layer is formed on the first surface of the lens body;

[0035] A second additional lens layer is formed on the surface of the first additional lens layer;

[0036] A third additional lens layer is provided on the surface of the second additional lens layer to form the lens structure.

[0037] In some embodiments, the refractive indices of the lens body, the first additional lens layer, the second additional lens layer, and the third additional lens layer are the same or increase sequentially.

[0038] In some embodiments, the thicknesses of the lens body, the first additional lens layer, the second additional lens layer, and the third additional lens layer decrease sequentially.

[0039] In some embodiments, before the lens structure is disposed on the light-emitting structural layer, the method includes:

[0040] A protective layer is formed on top of the light-emitting structural layer.

[0041] In some embodiments, the protective layer is made of one of Al2O3, ZnO, TiO2, ITO, and IZO; and / or,

[0042] The thickness of the protective layer is And / or,

[0043] The lens structure is made of SiNx; and / or,

[0044] The refractive index of the lens structure is greater than or equal to 1.88; and / or,

[0045] The transmittance of the lens structure is greater than 95% at 460 nm; and / or

[0046] The transmittance of the lens structure is greater than 95% at 460 nm.

[0047] The display module, its fabrication method, and display device provided in this application employ a lens structure formed from inorganic materials. Compared to existing lens structures formed from organic materials such as photoresist, this structure has a higher refractive index, which helps to bring the focal point of the lens structure closer to the light-emitting unit (pixel unit) of the light-emitting structure layer, thereby improving the light transmittance and enhancing the light efficiency of the display module.

[0048] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0050] Figure 1 This is a cross-sectional schematic diagram of a display module according to an embodiment of the present invention;

[0051] Figure 2 This is a cross-sectional schematic diagram illustrating another display module according to an embodiment of the present invention;

[0052] Figure 3 This is a flowchart illustrating a method for manufacturing a display module according to an embodiment of the present invention;

[0053] Figures 4 to 10 This is a manufacturing process diagram of a display module according to an embodiment of the present invention;

[0054] Figures 11 to 25 This is a process diagram illustrating the fabrication of another display module according to an embodiment of the present invention. Detailed Implementation

[0055] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0056] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The words “a” or “one” and similar terms used in this application specification and claims do not indicate a limitation of quantity, but rather indicate the presence of at least one. “A plurality” means two or more. The words “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” covers the element or object listed following “comprising” or “including” and its equivalents, and does not exclude other elements or objects. The words “connected” or “linked” and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The words “above” and / or “below” and similar terms are for ease of description only and are not limited to a location or spatial orientation. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0057] This application provides a display module, its fabrication method, and a display panel. The display module includes a light-emitting structure layer and a lens structure. The light-emitting structure layer includes a pixel unit layer with multiple pixel units and a color filter layer disposed on the pixel unit layer. The color filter layer has color conversion units corresponding one-to-one with the multiple pixel units. The lens structure is disposed on the light-emitting structure layer and has multiple lens units, each corresponding one-to-one with a color conversion unit. The lens units are formed using inorganic materials. Compared to existing lens structures formed using organic materials such as photoresist, the lens structure formed using inorganic materials has a higher refractive index, which allows the focal point of the lens structure to be closer to the light-emitting units (pixel units) of the light-emitting structure layer, thus improving light transmittance and enhancing the light efficiency of the display module.

[0058] The display panel mentioned in this application may be a Micro-OLED display device, which can be used in products or components with display functions such as mobile phones, tablets, televisions, and laptops, as a display panel for such products or components.

[0059] The following is in conjunction with the appendix Figures 1 to 25 This application provides a detailed description of the display module, its manufacturing method, and the display panel.

[0060] Please refer to Figure 1 As shown, this application provides a display module 100. The display module 100 includes a light-emitting structure layer 10 and a lens structure 20. The light-emitting structure layer 10 includes a pixel unit layer 11 having a plurality of pixel units 111 and a color filter layer 12 disposed on the pixel unit layer 11. The color filter layer 12 has color conversion units 121 corresponding one-to-one with the plurality of pixel units 111. The lens structure 20 is disposed on the light-emitting structure layer 10 and has a plurality of lens units 202, which are disposed one-to-one with the color conversion units 121; wherein, the lens units 202 are formed of inorganic materials.

[0061] Below the light-emitting structure layer 10 mentioned here, there may also be a substrate, such as an array substrate with a driving circuit layer.

[0062] In some embodiments, the lens structure 20 is made of SiNx or other similar inorganic materials with a high refractive index.

[0063] In some embodiments, the refractive index of the lens structure 20 is greater than or equal to 1.88.

[0064] In some embodiments, the transmittance of the lens structure is greater than 95% at 460nm, meaning that the lens structure has a transmittance of greater than 95% for light with a wavelength of 460nm or approximately 460nm, in order to ensure light transmittance.

[0065] In some embodiments, the lens structure 20 includes a lens body 21 and an additional lens layer 22.

[0066] The lens body 21 has a convex first surface. A lens layer 22 is added and attached to the first surface of the lens body 21, and has the same shape as the first surface of the lens body 21.

[0067] The lens layer 22 can be deposited by chemical vapor deposition (CVD).

[0068] The lens layer 22 is attached almost completely to the first surface of the lens body 21. However, since the lens body 21 and the added lens layer 22 are manufactured separately, an extremely thin interface layer is formed on their contact surface, with a thickness of only about 4 to 5 angstroms. This interface layer has virtually no impact on the optical performance of the display module 100.

[0069] In some embodiments, the material of the additional lens layer 22 is the same as the material of the lens body 21.

[0070] In some embodiments, a protective layer 30 is provided between the light-emitting structure layer 10 and the lens structure 20.

[0071] The material of the protective layer 30 can be one of Al2O3, ZnO, TiO2, ITO and IZO.

[0072] The thickness of the protective layer 30 can be This ensures that the color filter layer 12 is protected without affecting the propagation of light within the structure.

[0073] Please refer to Figure 2 As shown, this application also provides a display module 200. This display module 200 has a structure largely the same as the display module 100 described above. The difference lies in that the additional lens layer 22 in the display module 100 is a single-layer structure. The additional lens layer 22 in the display module 200 includes a first additional lens layer 221 disposed on the lens body 21, a second additional lens layer 222 disposed on the surface of the first additional lens layer 221, and a third additional lens layer 223 disposed on the surface of the second additional lens layer 222.

[0074] The additional lens layers here can also be formed by chemical vapor deposition (CVD).

[0075] In some embodiments, the refractive indices of the lens body 21, the first additional lens layer 221, the second additional lens layer 222, and the third additional lens layer 223 are the same or increase sequentially, so that the refractive indices of the lens body 21 and each additional lens layer form an increasing gradient, which is beneficial to reduce light reflectivity and further improve the optical performance of the product.

[0076] In some embodiments, the thicknesses of the lens body 21, the first additional lens layer 221, the second additional lens layer 222, and the third additional lens layer 223 decrease sequentially.

[0077] For example, in some embodiments, the maximum diameter of the orthographic projection of the lens body 21 (hereinafter referred to as the diameter) can be 2.8 μm, and the height can be 1.6 μm. The thickness of the first additional lens layer 221 can be 0.3 μm, and the thickness of the second additional lens layer 222 can be 0.2 μm. The thickness of the third additional lens layer 223 can be 0.1 μm. Due to the limitation of the step coverage of vapor deposition, when forming each additional lens layer to increase the size of the lens unit, for every 0.1 μm increase in the thickness of the additional lens layer in the lens unit, the height of the entire lens unit can increase by 0.1 μm accordingly, and the diameter of the lens unit can increase by approximately 0.07 μm accordingly. Therefore, the lens unit 202 formed in this embodiment can have a height of up to 2.1 μm and a diameter of approximately 3.2 μm.

[0078] Furthermore, the first surface of the lens body 21 in the lens unit 202 can be disposed away from the light-emitting structure layer or toward the light-emitting structure layer 10, and this application does not limit this.

[0079] This application also provides a method for manufacturing a display module, which can be used to manufacture the above-mentioned display module 100 and display module 200. The method for manufacturing the display module includes the following steps S101 and S103:

[0080] In step S101, a light-emitting structure layer is provided, the light-emitting structure layer including a pixel unit layer having multiple pixel units and a color filter layer disposed on the pixel unit layer, the color filter layer having color conversion units corresponding one-to-one with the multiple pixel units.

[0081] In step S103, a lens structure is disposed on the light-emitting structure layer. The lens structure has multiple lens units, and the multiple lens units are disposed one-to-one with the color conversion unit. The lens units are formed of inorganic materials.

[0082] This section will first describe in detail the manufacturing method of display module 100 and display modules similar to display module 100. Please refer to the following... Figure 3 And combine when necessary Figures 4 to 10 As shown, in some embodiments,

[0083] like Figure 4 As shown, in step S101, a light-emitting structure layer 10 is provided. The light-emitting structure layer 10 includes a pixel unit layer 11 having a plurality of pixel units 111 and a color filter layer 12 disposed on the pixel unit layer 11. The color filter layer 12 has color conversion units 121 corresponding one-to-one with the plurality of pixel units 111.

[0084] Below the light-emitting structure layer 10 mentioned here, there may also be a substrate, such as an array substrate with a driving circuit layer.

[0085] The improvement of the light-emitting structure layer mentioned here can be understood as providing a light-emitting structure layer disposed on the substrate. That is, providing a component consisting of a substrate and a light-emitting structure layer.

[0086] like Figure 5 As shown, before step S103, the method includes the following step S102:

[0087] In step S102, a protective layer 30 is formed on the light-emitting structure layer 10.

[0088] In some embodiments, the material of the protective layer 30 is one of Al2O3, ZnO, TiO2, ITO, and IZO.

[0089] The thickness of the protective layer 30 is This design aims to protect the color filter layer 12 without affecting the propagation of light within the structure. The protective layer can be formed using atomic layer deposition (ALD) at low temperatures (e.g., 90°C) to ensure that the underlying color filter layer 12 and other structures remain unaffected during fabrication.

[0090] In some embodiments, step S103 can be implemented by the following steps S1031 and S1033:

[0091] In step S1031, an inorganic material layer 201 is formed on the light-emitting structure layer 10.

[0092] In step S1033, the inorganic material layer 201 is etched to form the lens structure 20.

[0093] like Figure 6 As shown, the inorganic material layer 201 can be an inorganic material such as silicon oxide. It can be deposited using a chemical vapor deposition (CVD) method.

[0094] The thickness of the inorganic material layer 201 can be determined according to specific circumstances. For example, in some embodiments, the thickness of the inorganic material layer 201 can be 2 μm to 2.2 μm. Of course, in other embodiments, the inorganic material layer can also be set to other thicknesses. This application does not limit this.

[0095] In some embodiments, step S1032 can be implemented by the following steps S1321 to S1323:

[0096] In step S1321, an etching adhesive layer 401 is formed on the surface of the inorganic material layer 201.

[0097] In step S1322, the etchant layer 401 is etched to form a transfer lens structure 40; the transfer lens structure 40 has the same shape as the lens structure 20.

[0098] In step S1323, the inorganic material layer 201 is etched by a transfer method to form the lens structure 20.

[0099] like Figure 7 As shown, an etching material is coated on the surface of the inorganic material layer 201 to form an etching layer 401.

[0100] The material used for the etched adhesive layer 401 can be an organic photosensitive material used in related technologies to prepare lens units.

[0101] like Figure 8 As shown, the etchant layer 401 can be etched using methods such as exposure and development to form a transfer lens structure 40. This transfer lens structure 40 includes multiple spaced transfer lens units.

[0102] The dimensions of the transfer lens structure 40 can be set according to specific circumstances. For example, in some embodiments, the diameter of the transfer lens structure 40 can be 3.6 μm and the height can be 2.2 μm.

[0103] The fact that the transfer lens structure 40 and the lens structure 20 have the same shape can be understood as meaning that they have the same shape, but the dimensions of their corresponding parts are in the same proportion.

[0104] The lens structure 20 described here includes a lens body 21 and an additional lens layer 22 disposed on the surface of the lens body 21. Accordingly, the etching of the inorganic material layer 201 by transfer method to form the lens structure 20 in step S1323 can be understood as follows:

[0105] like Figure 9 As shown, the inorganic material layer 201 is etched to form a plurality of lens bodies 21 corresponding one-to-one with the transfer lens units. Each lens body 21 has a convex first surface. The lens bodies 21 have the same shape as the transfer lens units, and the lens bodies 21 are spaced apart from each other.

[0106] It should be noted that when transferring and etching the inorganic material layer 201 to form the lens body 21, the transfer can be performed using plasma etching. Furthermore, when specifically using plasma etching, the appropriate lens structure for transfer and the etching ratio of the plasma material at the interface between the organic and inorganic materials can be determined according to specific requirements, thereby obtaining the desired lens body 21. For example, the dimensions of the transfer structure can generally be set to be consistent with (approximately the same as) the dimensions of the desired lens structure.

[0107] Due to the different etching ratios of the etching materials at the interfaces of organic and inorganic materials during the transfer process, most etching materials etch inorganic materials at a faster rate than organic materials under the same conditions. This results in the size of the lens body 21 formed after transfer being slightly smaller than the size of the transfer lens unit in the transfer lens structure. Here, the reduction or even elimination of the reduction in the size of the lens unit caused by the transfer process can be achieved by adding a lens layer 22 on the surface of the lens body 21, so that the final lens unit is about the same size as the transfer lens unit in the transfer lens structure.

[0108] like Figure 10 As shown, after the lens body 21 is formed, an inorganic material layer 22 is deposited on the first surface of the lens body 21 by means of CVD or other methods to form an additional lens layer 22, thereby forming a display module 100 with a single-layer additional lens layer 22 on the lens body 21.

[0109] The thickness of the added lens layer 22 can be set according to specific circumstances.

[0110] The following describes in detail the fabrication method of display module 200 and similar display modules with multiple additional lens layers. (As described above...) Figures 4 to 10 The manufacturing method of the display module 100 is largely the same; for similarities or identicalities, please refer to the relevant descriptions above. This section mainly focuses on the differences. Please refer to... Figures 11 to 25 As shown, the additional lens layer 22 of the display module 200 includes a first additional lens layer 221 disposed on the lens body 21, a second additional lens layer 222 disposed on the surface of the first additional lens layer 221, and a third additional lens layer 223 disposed on the surface of the second additional lens layer 222. Correspondingly, unlike the manufacturing method of the display module 100 described above, after forming the lens body 21 in step S1323, the method further includes the following steps S13231 to S13233:

[0111] In step S13231, a first additional lens layer 221 is formed on the first surface of the lens body 21.

[0112] In step S13232, a second additional lens layer 222 is formed on the surface of the first additional lens layer 221.

[0113] In step S13233, a third additional lens layer 223 is provided on the surface of the second additional lens layer 222 to form the lens structure 20.

[0114] like Figures 18 to 20As shown, after forming the first additional lens layer 221 and before forming the second additional lens layer 222, the inorganic material layer portion 2211 deposited between adjacent lens bodies 21 can be removed by photolithography. This ensures that the lens structure is consistent with the transfer lens structure 40 while the second additional lens layer 222 is being formed. In a specific implementation, a corresponding photoresist layer 402 is coated on the first additional lens layer 221 to form a through hole 4001 between adjacent lens bodies 21. Then, the corresponding inorganic material layer portion 2211 is etched in the through hole 4001, and then the remaining photoresist layer 402 is removed.

[0115] like Figure 21 As shown, and further in Figure 20 The resulting structure deposits a corresponding inorganic material layer to form a second additional lens layer 222.

[0116] like Figures 22 to 24 As shown, after forming the second additional lens 222 and before forming the third additional lens layer 223, the inorganic material layer portion 2221 deposited between adjacent lens bodies 21 can be removed by photolithography. This ensures that the lens structure is consistent with the transfer lens structure 40 while the third additional lens layer 223 is being formed. In a specific implementation, a corresponding photoresist layer 403 can be coated on the second additional lens layer 222 to form a through hole 4002 between adjacent lens bodies 21. Then, the corresponding inorganic material layer portion 2221 is etched in the through hole 4002, and the remaining photoresist layer 403 is removed.

[0117] like Figure 25 As shown, and further in Figure 24 The resulting structure deposits a corresponding inorganic material layer, forming a third additional lens layer 223.

[0118] In some embodiments, the refractive indices of the lens body 21, the first additional lens layer 221, the second additional lens layer 222, and the third additional lens layer 223 are the same or increase sequentially.

[0119] In some embodiments, the thicknesses of the lens body 21, the first additional lens layer 221, the second additional lens layer 222, and the third additional lens layer 223 decrease sequentially.

[0120] The lens body 21 of the lens structure 20 and the structure of each additional lens layer can be referred to in the above description, and will not be repeated here.

[0121] It should be noted that an extremely thin interface layer can be formed at the contact surface between the lens body 21 and the first additional lens layer 221, as well as at the contact surface of each adjacent additional lens layer. The thickness is only about 4 to 5 angstroms. This interface layer has virtually no impact on the optical performance of the display module 200.

[0122] Furthermore, it should be noted that in some other embodiments, a single transfer etching process can be used to form a single lens unit by adjusting the etching ratio of the plasma etching material to the interface between the organic and inorganic materials, and by adjusting the size of the transfer lens structure. This application does not limit this process and allows for adjustments based on specific circumstances. This application also provides a display panel comprising the display module described above. The display panel can be a Micro-OLED display device and can be applied to products or components with display functions, such as mobile phones, tablets, televisions, and laptops, serving as a display panel for these products or components.

[0123] In this application, the structural embodiments and method embodiments described can complement each other without conflict.

[0124] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "multiple" and "several" refer to two or more unless otherwise expressly defined.

[0125] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. The invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0126] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A display module, characterized by The display module comprises: a light-emitting structure layer comprising a pixel unit layer having a plurality of pixel units and a color film layer arranged on the pixel unit layer, the color film layer having color conversion units corresponding to the plurality of pixel units; a lens structure arranged on the light-emitting structure layer, the lens structure having a plurality of lens units, the plurality of lens units being arranged corresponding to the color conversion units; wherein the lens units are formed of inorganic material; the lens structure comprises: a lens main body having a first surface protruding outward; an additional lens layer arranged on the first surface of the lens main body and conforming to the shape of the first surface of the lens main body; the lens main body and the additional lens layer are formed of inorganic material, the additional lens layer comprises a first additional lens layer arranged on the lens main body and in contact with the lens main body, a second additional lens layer arranged on the surface of the first additional lens layer and in contact with the surface of the first additional lens layer, and a third additional lens layer arranged on the surface of the second additional lens layer and in contact with the surface of the second additional lens layer; the refractive indexes of the lens main body, the first additional lens layer, the second additional lens layer and the third additional lens layer are the same or gradually increase.

2. The display module of claim 1, wherein, the material of the additional lens layer is the same as the material of the lens main body.

3. The display module of claim 1, wherein the display module is configured to be mounted on a display stand. the thicknesses of the lens main body, the first additional lens layer, the second additional lens layer and the third additional lens layer gradually decrease.

4. The display module of any one of claims 1 to 3, wherein, a protective layer is arranged between the light-emitting structure layer and the lens structure.

5. The display module of claim 4, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. the material of the protective layer is one of Al2O3, ZnO, TiO2, ITO and IZO; and / or the thickness of the protective layer is 400 Å to 500 Å; and / or the material of the lens structure is SiNx; and / or the refractive index of the lens structure is greater than or equal to 1.88; and / or the transmittance of the lens structure is greater than 95% at 460 nm.

6. A display panel, characterized by, The display module comprises the display module according to any one of claims 1 to 5.

7. A method for manufacturing a display module, characterized by, The display module comprises: a light-emitting structure layer comprising a pixel unit layer having a plurality of pixel units and a color film layer arranged on the pixel unit layer, the color film layer having color conversion units corresponding to the plurality of pixel units; a lens structure arranged on the light-emitting structure layer, the lens structure having a plurality of lens units, the plurality of lens units being arranged corresponding to the color conversion units; wherein the lens units are formed of inorganic material; the lens structure comprises: a lens main body having a first surface protruding outward; an additional lens layer arranged on the first surface of the lens main body and conforming to the shape of the first surface of the lens main body; the lens main body and the additional lens layer are formed of inorganic material, the additional lens layer comprises a first additional lens layer arranged on the lens main body and in contact with the lens main body, a second additional lens layer arranged on the surface of the first additional lens layer and in contact with the surface of the first additional lens layer, and a third additional lens layer arranged on the surface of the second additional lens layer and in contact with the surface of the second additional lens layer; The refractive indexes of the lens body, the first additional lens layer, the second additional lens layer and the third additional lens layer are same or gradually increase.

8. The method for preparing the display module as described in claim 7, characterized in that, The lens structure is arranged on the light-emitting structure layer includes: forming an inorganic material layer on the light-emitting structure layer; etching the inorganic material layer to form the lens structure.

9. The method for manufacturing a display module as described in claim 7, characterized in that, After forming the inorganic material layer on the light-emitting structure layer includes: arranging an etching adhesive layer on the surface of the inorganic material layer; etching the etching adhesive layer to form a transfer lens structure; the transfer lens structure is consistent with the shape of the lens structure; etching the inorganic material layer by using the transfer method to form the lens structure.

10. The method for preparing the display module as described in claim 9, characterized in that, The lens structure includes a lens body and an additional lens layer arranged on the surface of the lens body, and etching the inorganic material layer by using the transfer method to form the lens structure includes: etching the inorganic material layer to form the lens body, and the lens body has a first surface which is convex outward.

11. The method for preparing the display module as described in claim 10, characterized in that, After forming the lens body, the method includes: forming an additional lens layer on the first surface of the lens body.

12. The method for preparing the display module as described in claim 11, characterized in that, The method includes: forming a first additional lens layer on the first surface of the lens body; forming a second additional lens layer on the surface of the first additional lens layer; forming a third additional lens layer on the surface of the second additional lens layer to form the lens structure.

13. The method for preparing the display module as described in claim 12, characterized in that, The thicknesses of the lens body, the first additional lens layer, the second additional lens layer and the third additional lens layer gradually decrease.

14. The method for preparing a display module as described in any one of claims 7 to 13, characterized in that, Before arranging the lens structure on the light-emitting structure layer, the method includes: forming a protective layer on the light-emitting structure layer.

15. The method for preparing the display module as described in claim 14, characterized in that, The material of the protective layer is one of Al2O3, ZnO, TiO2, ITO and IZO; and / or, The thickness of the protective layer is 400 Å ~ 500 Å; and / or, The material of the lens structure is SiNx; and / or, The refractive index of the lens structure is greater than or equal to 1.88; and / or, The transmittance of the lens structure is greater than 95% at 460 nm.

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