Quantum dot film, method for manufacturing quantum dot film, and display device

Abstract

A quantum dot film, a method for manufacturing a quantum dot film, and a display device. The quantum dot film includes a stacked first functional layer and a second functional layer. The first functional layer is provided with a first quantum hole, which contains a first quantum dot, and the first quantum dot is used to excite and form a first primary color of light. The second functional layer is provided with a second quantum hole, which contains a second quantum dot, and the second quantum dot is used to excite and form a second primary color of light. Along the thickness direction of the quantum dot film, the projected overlap area of ​​the first quantum dot and the second quantum dot is zero. The technical solution of this application restricts the positions of the first quantum dot and the second quantum dot through the first quantum hole and the second quantum hole to ensure that the first quantum dot and the second quantum dot are arranged in the quantum dot film without overlapping in the light output direction of the display device. This reduces unnecessary interactions between the third primary color of light and the first and second quantum dots when passing through the quantum dot film, thereby improving the color accuracy of the display device.

Description

Technical Field

[0001] The present application relates to the technical field of quantum dot films, and in particular to a quantum dot film, a method for manufacturing a quantum dot film, and a display device. Background Art

[0002] Quantum dots, also known as nanocrystals, are semiconductor particles composed of Group II-VI or Group III-V elements, typically ranging in size from 1 to 10 nm. These semiconductor particles have a unique property: when stimulated by light or electricity, they emit light of a specific frequency, and this frequency varies with the size of the semiconductor.

[0003] Traditional quantum dot films typically contain first and second quantum dots, each with different diameters. When the third primary color of light from a light source shines into the quantum dot film, it interacts with the first and second quantum dots within the film, exciting the first quantum dots to form the first primary color and the second quantum dots to form the second primary color. The first and second primary colors, combined with the third primary color from the light source, combine to produce high-quality white light. This unique process not only significantly improves the display's color gamut coverage but also enables more realistic color reproduction, meeting user demands for high-quality color expression.

[0004] However, in the related art, after the first primary color light passes through the quantum dot film, the purity of the second primary color light and the third primary color light excited to be formed is insufficient, resulting in low purity of the final mixed white light. Summary of the Invention

[0005] The purpose of this application is to provide a quantum dot film, a method for manufacturing a quantum dot film, and a display device, aiming to solve the problem of low purity of white light generated by the quantum dot film in related technologies.

[0006] To achieve the purpose of the present application, in a first aspect, the present application provides a quantum dot film, which includes a stacked first functional layer and a second functional layer; the first functional layer is provided with a first quantum hole, and the first quantum hole is provided with a plurality of first quantum dots, and the plurality of first quantum dots are arranged in sequence in the thickness direction of the quantum dot film, and the first quantum dots are used to excite and form a first primary color light; the second functional layer is provided with a second quantum hole, and the second quantum hole is provided with a plurality of second quantum dots, and the plurality of second quantum dots are arranged in sequence in the thickness direction of the quantum dot film, and the second quantum dots are used to excite and form a second primary color light; along the thickness direction of the quantum dot film, the overlapping area of ​​the projections of the first quantum dots and the second quantum dots is 0; along the thickness direction of the quantum dot film, the aperture of the projection of the first quantum hole is A, the aperture of the projection of the second quantum hole is B, and the distance between the projections of each adjacent first quantum hole and the second quantum hole is C, A>C>B.

[0007] In a possible implementation, the number of the first quantum dots in each of the first quantum holes is N, and the number of the second quantum dots in each of the second quantum holes is M, where N=M.

[0008] In a possible implementation, the first functional layer includes a first sealing layer and a first water and oxygen barrier layer that are stacked, and the first water and oxygen barrier layer is connected to the second functional layer;

[0009] The first quantum hole is provided in the first water and oxygen barrier layer.

[0010] In a possible implementation, the second functional layer includes a second sealing layer, a second water and oxygen barrier layer, and a substrate layer that are stacked; the second sealing layer is used to connect with the first water and oxygen barrier layer;

[0011] The second quantum hole is provided in the second water and oxygen barrier layer.

[0012] In a second aspect, the present application further proposes a method for manufacturing a quantum dot film, the method comprising the following steps:

[0013] forming a second quantum hole on the second functional layer, and filling the second quantum hole with second quantum dots, wherein a plurality of the second quantum dots are sequentially arranged in the thickness direction of the quantum dot film;

[0014] A first quantum hole is formed on the first functional layer, and a first quantum dot is filled in the first quantum hole. A plurality of the first quantum dots are sequentially arranged in the thickness direction of the quantum dot film. The second quantum dots are used to excite and form a second primary color light. Along the thickness direction of the quantum dot film, the overlapping area of ​​the projections of the first quantum dots and the second quantum dots is zero.

[0015] stacking the first functional layer on the second functional layer;

[0016] Along the thickness direction of the quantum dot film, the projected aperture of the first quantum hole is A, the projected aperture of the second quantum hole is B, the distance between the projections of adjacent first quantum holes and second quantum holes is C, and A>C>B.

[0017] In a possible implementation, the second functional layer includes a second sealing layer, a second water and oxygen barrier layer, and a substrate layer that are stacked;

[0018] The step of forming a second quantum hole on the second functional layer and filling the second quantum hole with a second quantum dot comprises the following steps:

[0019] forming the second water and oxygen barrier layer on the substrate layer;

[0020] forming a second quantum hole on the second water and oxygen barrier layer, and coating a second quantum dot liquid on the side of the second water and oxygen barrier layer away from the substrate layer, so that the second quantum dot is filled into the second quantum hole;

[0021] The second sealing layer is formed on the second water and oxygen barrier layer.

[0022] In one possible implementation, the first functional layer includes a first sealing layer and a first water and oxygen barrier layer that are stacked, and forming a first quantum hole on the first functional layer and filling the first quantum dot into the first quantum hole includes the following steps:

[0023] forming a first water and oxygen barrier layer on the second sealing layer;

[0024] forming a first quantum hole on the first water and oxygen barrier layer, and coating a first quantum dot liquid on a side of the first water and oxygen barrier layer away from the second sealing layer, so that the first quantum dot is filled into the first quantum hole;

[0025] A first sealing layer is formed on the first water and oxygen barrier layer.

[0026] The technical solution of this application provides a first quantum hole in the first functional layer of the quantum dot film and a second quantum hole in the second functional layer of the quantum dot film. The first and second quantum holes are used to restrict the positions of the first and second quantum dots, ensuring that the first and second quantum dots are arranged within the quantum dot film without overlapping in the light output direction of the display device. This reduces unnecessary interaction between the third primary color light and the first and second quantum dots when passing through the quantum dot film, avoids color distortion and brightness reduction caused by spectral overlap between the first and second quantum dots, improves the light purity of the second and third primary colors, and enhances the color accuracy of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A cross-sectional view of an embodiment of a display device provided by the present application;

[0029] Figure 2 A cross-sectional view of a quantum dot film in the related art;

[0030] Figure 3 for Figure 1 A cross-sectional view of a first embodiment of a quantum dot film;

[0031] Figure 4 for Figure 3 A schematic structural diagram of an embodiment of a quantum dot film during the production process;

[0032] Figure 5 for Figure 3 A schematic structural diagram of another embodiment of the quantum dot film during the production process;

[0033] Figure 6 for Figure 1 A cross-sectional view of a second embodiment of a quantum dot film;

[0034] Figure 7 A schematic flow chart of an embodiment of a method for manufacturing a quantum dot film provided in this application;

[0035] Figure 8 A schematic diagram of a process of forming a second quantum hole on a second functional layer and filling the second quantum hole with a second quantum dot in a first embodiment;

[0036] Figure 9A schematic diagram of the structure for forming a second quantum hole on the second functional layer;

[0037] Figure 10 A schematic diagram of a second embodiment of the process for forming a second quantum hole on a second functional layer and filling the second quantum hole with a second quantum dot;

[0038] Figure 11 A schematic diagram of a process of forming a first quantum hole on a first functional layer and filling the first quantum hole with a first quantum dot in a first embodiment;

[0039] Figure 12 A schematic diagram of a process for forming a second quantum hole on a first water and oxygen barrier layer according to a first embodiment;

[0040] Figure 13 A schematic diagram of the structure of forming a first quantum hole on the first functional layer;

[0041] Figure 14 A schematic flow chart of a second embodiment for forming a first quantum hole on a first functional layer and filling the first quantum hole with a first quantum dot.

[0042] Description of reference numerals:

[0043] 1000-display device;

[0044] 100-optical film;

[0045] 10-Quantum dot film;

[0046] 101-first functional layer, 102-second functional layer, 1-substrate layer, 2-first water and oxygen barrier layer, 3-second water and oxygen barrier layer, 4-first sealing layer, 5-second sealing layer, 6-first quantum hole, 7-second quantum hole, 8-first quantum dot, 9-second quantum dot;

[0047] 20-diffusion film, 30-brightness enhancement film, 40-reflective film;

[0048] 200-backlight assembly, 210-light source, 220-light guide plate;

[0049] 300-back panel;

[0050] 400-display screen;

[0051] 2000a-first light shielding plate, 2100a-first exposure hole, 2000b-second light shielding plate, 2100b-second exposure hole;

[0052] 3000a-first photoresist layer, 3000b-second photoresist layer;

[0053] 4000-light-shielding layer. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this application includes any and all combinations of one or more of the relevant listed items.

[0057] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0058] Please refer to Figure 1 This application proposes a display device 1000, which includes a back panel 300, a backlight assembly 200, and a display screen 400. The back panel 300 serves as the supporting framework of the display device 1000, providing support and connection for the various component assemblies of the display device 1000. The back panel 300 is formed with a mounting cavity with an opening on one side, the display screen 400 is disposed in the opening, and the backlight assembly 200 is mounted within the mounting cavity.

[0059] Display screen 400 is used to display images or information. It receives signals from a video source (such as a computer, a television signal receiver, a game console, etc.), converts these signals into visual images, and presents them on the screen. Display screen 400 can be a liquid crystal display screen 400 or an organic light emitting diode (OLED) display screen 400, which is not limited in this application.

[0060] The backlight assembly 200 is used to provide backlight for the display screen 400. The backlight assembly 200 includes a light source 210, a light guide plate 220, and an optical film 100 disposed on the light-emitting side of the light guide plate 220. The light source 210 is used to generate light. The light source 210 can be an incandescent lamp or an LED lamp, and this application does not limit this. The light provided by the light source 210 can be blue light, yellow light, or white light, and this application does not limit this.

[0061] The light guide plate 220 is used to convert the point light source 210 or line light source 210 provided by the light source 210 component into a surface light source 210, thereby improving the uniformity of light output from the display device 1000. The material of the light guide plate 220 can be acrylic plate (PMMA) or polycarbonate (PC), and this application does not impose any restrictions on this.

[0062] The optical film 100 is used to improve light quality and includes a brightness enhancement film 30, a diffuser film 20, a reflector 40, and a quantum dot film 10. The brightness enhancement film 30 is used to recycle and concentrate light to increase the intensity of light emitted from the backlight assembly 200. The diffuser film 20 is used to refract and diffract light to improve light uniformity. The reflector 40 is used to reflect light from the light source 210 and light guide plate 220 to the backplate 300 back to the display screen 400, thereby improving the backlight module's light utilization efficiency.

[0063] Quantum dot film 10 contains quantum dots, also known as nanocrystals. These are semiconductor particles composed of Group II-VI or Group III-V elements, typically with a particle size between 1 and 10 nm. These semiconductor particles have a unique property: when stimulated by light or electricity, they emit light of a specific frequency, and this frequency varies with the size of the semiconductor.

[0064] Please refer to Figure 2 In a conventional quantum dot film 10, first and second quantum dots 8 and 9 are typically disposed, each having a different diameter. When the third primary color light from light source 210 enters the quantum dot film 10, it interacts with the first and second quantum dots 8 and 9 within the film, exciting the first quantum dots 8 to form the first primary color light and the second quantum dots 9 to form the second primary color light. The first and second primary colors of light mix with the third primary color light from light source 210 to produce high-quality white light. This unique process not only significantly improves the display's color gamut coverage but also more realistically reproduces colors, meeting users' demands for high color expression.

[0065] However, if Figure 2As shown, in the related art, the first quantum dots 8 and the second quantum dots 9 are chaotically and disorderly stacked in the quantum dot film 10. When the third primary color light from the light source 210 is irradiated into the quantum dot film 10, the propagation path of the light in the film becomes complicated and difficult to control due to the disordered arrangement of the first quantum dots 8 and the second quantum dots 9. This causes the interaction between the third primary color light emitted by the light source 210 and the first quantum dots 8 and the second quantum dots 9 in the quantum dot film 10 to become uneven and unpredictable. This uneven interaction will weaken the purity of the first primary color light and the second primary color light excited by the first quantum dots 8 and the second quantum dots 9, thereby affecting the quality of the white light finally formed by the mixture and ultimately affecting the color accuracy of the display device 1000.

[0066] To solve the above problems, in the present application, the quantum dot film 10 includes a stacked first functional layer 101 and a second functional layer 102; the first functional layer 101 is provided with a first quantum hole 6, and the first quantum dot 8 is provided inside the first quantum hole 6, and the first quantum dot 8 is used to excite and form a first primary color light; the second functional layer 102 is provided with a second quantum hole 7, and the second quantum dot 9 is provided inside the second quantum hole 7, and the second quantum dot 9 is used to excite and form a second primary color light; along the thickness direction of the quantum dot film 10, the projected overlapping area of ​​the first quantum dot 8 and the second quantum dot 9 is 0.

[0067] The technical solution of the present application provides a first quantum hole 6 on the first functional layer 101 of the quantum dot film 10, and a second quantum hole 7 on the second functional layer 102 of the quantum dot film 10. The first quantum hole 6 and the second quantum hole 7 restrict the positions of the first quantum dot 8 and the second quantum dot 9 to ensure that the first quantum dot 8 and the second quantum dot 9 are arranged in the quantum dot film 10 without overlapping in the light emitting direction of the display device 1000. In this way, unnecessary interaction between the third primary color light and the first quantum dot 8 and the second quantum dot 9 when passing through the quantum dot film 10 is reduced, color distortion and brightness reduction caused by spectral overlap between the first quantum dot 8 and the second quantum dot 9 are avoided, the light purity of the second primary color light and the third primary color light is improved, and the color accuracy of the display device 1000 is improved.

[0068] Hereinafter, the quantum dot film 10 provided in the present application will be described in detail with reference to the accompanying drawings.

[0069] The quantum dot film 10 includes a first functional layer 101 and a second functional layer 102 stacked in sequence. The first functional layer 101 and the second functional layer 102 serve as the structural body of the quantum dot film 10, and are used to support other structures of the quantum dot film 10 and refract light incident into the quantum dot film 10.

[0070] A first quantum hole 6 is provided in the first functional layer 101, and a second quantum hole 7 is provided in the second functional layer 102. A first quantum dot 8 is provided within the first quantum hole 6, and a second quantum dot 9 is provided within the second quantum hole 7. The first quantum dot 8 and the second quantum dot 9 are semiconductor particles composed of Group II-VI or Group III-V elements. The semiconductor particles are made of ZnS or PbS as a shell material, and one or more nanomaterials containing cadmium or zinc such as CdS, CdSe, CdTe, ZnSe, GaN, and InAs are added to the shell material.

[0071] When the third primary color light from light source 210 is irradiated into quantum dot film 10, it interacts with first quantum dots 8 and second quantum dots 9, exciting first quantum dots 8 to form first primary color light and second quantum dots 9 to form second primary color light. The first and second primary colors, combined with the third primary color light from light source 210, produce high-quality white light, thereby improving the color gamut coverage of display device 1000.

[0072] It should be noted that during the above-mentioned excitation process, the third primary color light emitted by the light source 210 can be red light, green light, or blue light, and this application does not impose any specific restrictions on this. After excitation by the third primary color light, the first primary color light excited by the first quantum dot 8 and the second primary color light excited by the second quantum dot 9 can also be blue light, red light, or green light, depending on the characteristics of the quantum dot material and the excitation conditions. This application also does not impose any specific restrictions on this. Theoretically, as long as the quantum dot material is excited by light sources 210 of different wavelengths, thereby generating a combination of different colors of light, no matter what form these color combinations take (for example, a combination of red and green light, a combination of blue and red light, a combination of green and blue light, etc.), as long as they can achieve a specific display effect or meet specific application requirements, they should be within the scope of protection of this application.

[0073] For example, in this application, the first quantum dots 8 are red quantum dots with a diameter between 5-6 mm, the second quantum dots 9 are green quantum dots with a diameter between 3-4 mm, and the light source 210 is an LED blue light source 210. When the blue light from the LED light source 210 enters the functional layer, it is refracted by the functional layer, interacting with the red quantum dots to form red light, and interacting with the green quantum dots to form green light. Ultimately, the blue, red, and green light mix to form white light, thereby improving the color gamut coverage of the display device 1000.

[0074] During this process, the first quantum holes 6 and the second quantum holes 7 provided in the first functional layer 101 and the second functional layer 102 can restrict the positions of the first quantum dots 8 and the second quantum dots 9, ensuring that the first quantum dots 8 and the second quantum dots 9 are disposed within the quantum dot film 10 without overlapping in the light-emitting direction of the display device 1000. This reduces unnecessary interactions between the third primary color light and the first quantum dots 8 and the second quantum dots 9 when passing through the quantum dot film 10, avoids color distortion and brightness reduction caused by spectral overlap between the first quantum dots 8 and the second quantum dots 9, improves the light purity of the second and third primary colors, and enhances the color accuracy of the display device 1000.

[0075] There are various structural arrangements of the first functional layer 101 and the second functional layer 102. In one embodiment of the present application, the first functional layer 101 includes a first sealing layer 4 and a first water and oxygen barrier layer 2 that are stacked, and the second functional layer 102 includes a second sealing layer 5, a second water and oxygen barrier layer 3 and a substrate layer 1 that are stacked, wherein the first water and oxygen barrier layer 2 of the first functional layer 101 is connected to the second sealing layer 5 of the second functional layer 102, the first quantum hole 6 is provided in the first water and oxygen barrier layer 2, and the second quantum hole 7 is provided in the second water and oxygen barrier layer 3.

[0076] In this embodiment, the substrate layer 1 is made of polyethylene terephthalate (PET) or polymethyl methacrylate (PMMA) or polycarbonate (PC) or UV-cured acrylic film with a transmittance ≥ 90% and a refractive index ≥ 1.45. Its purpose is to provide support for the entire quantum dot film 10 to improve the support strength of the quantum dot film 10.

[0077] The first and second water / oxygen barrier layers 2 and 3 are used to isolate the first and second quantum dots 8 and 9 from the effects of moisture and oxygen in the external environment, thereby protecting the first and second quantum dots 8 and 9 located therein from damage. The material of the first and second water / oxygen barrier layers 2 and 3 can be a fluororesin, a high-Tg (glass transition temperature) methacrylate modified with an epoxy resin, a hydrophobic coating formed by modifying polyurethane or acrylic acid, and this application does not impose any restrictions thereto.

[0078] The first sealing layer 4 is provided at the opening of the first quantum hole 6 to seal the first quantum hole 6, thereby preventing water vapor from entering the water and oxygen barrier layer through the opening of the first quantum hole 6 and protecting the safety of the first quantum dot 8. The material of the first sealing layer 4 can be epoxy resin or silicone resin, which is not limited in this application.

[0079] The second sealing layer 5 is provided at the opening of the second quantum hole 7 to seal the second quantum hole 7, thereby preventing water vapor from entering the water and oxygen barrier layer through the opening of the second quantum hole 7 and protecting the safety of the second quantum dot 9. The material of the second sealing layer 5 can be epoxy resin or silicone resin, which is not limited in this application.

[0080] In this embodiment, the first quantum hole 6 and the second quantum hole 7 are arranged in different water and oxygen barrier layers, so that when the first quantum hole 6 and the second quantum hole 7 are filled with the first quantum dot 8 and the second quantum dot 9, they can also be filled separately. In this way, the first quantum hole 6 and the second quantum hole 7 are prevented from being located in the same plane of the water and oxygen barrier layer. Figure 4 As shown, the first quantum hole 6 is mixed with the second quantum dot 9, or as shown Figure 5 As shown, the first quantum dots 8 block the second quantum holes 7 , causing holes to appear in the quantum dot film 10 , thereby reducing the difficulty of forming the quantum dot film 10 and improving the forming rate of the quantum dot film 10 .

[0081] Please refer to Figure 6 In other embodiments of the present application, the first functional layer 101 may include a first sealing layer 4, a first water and oxygen barrier layer 2, and a substrate layer 1, and the second functional layer 102 may include a second water and oxygen barrier layer 3 and a second sealing layer 5, wherein the substrate layer 1 of the first functional layer 101 is connected to the second water and oxygen barrier layer 3 of the second functional layer 102. The first quantum hole 6 is provided in the first water and oxygen barrier layer 2, and the second quantum hole 7 is provided in the second water and oxygen barrier layer 3. This application does not impose any restrictions on this.

[0082] Please refer to Figure 3 and Figure 6 In the first and second functional layers 101 and 102, the first and second quantum holes 6 and 7 may be scattered or distributed within the first and second functional layers 101 and 102, respectively. In one embodiment of the present application, the quantum dot film 10 includes a plurality of first and second quantum holes 6 and 7. Along the thickness of the quantum dot film 10, the projections of the first and second quantum holes 6 and 7 are alternately arranged along the length and / or width of the quantum dot film 10. This ensures uniform distribution of the first and second primary colors of light across the quantum dot film 10, thereby improving the uniformity of mixing the first, second, and third primary colors, increasing the purity of white light generated by the quantum dot film 10, and enhancing the color accuracy of the display device 1000.

[0083] To further improve the uniformity of mixing the first, second, and third primary colors, in one embodiment of the present application, the spacing between adjacent first quantum holes 6 and second quantum holes 7 is set to be the same, with the aperture of the first quantum hole 6 being A, the aperture of the second quantum hole 7 being B, and the spacing between adjacent first quantum holes 6 and second quantum holes 7 being C, where A>C>B. This ensures that the amount of third primary color light that passes through the gap between the first quantum hole 6 and the second quantum hole 7 remains equal to that of the first and second primary colors, thereby improving the uniformity of mixing the first, second, and third primary colors, increasing the purity of the white light generated by the quantum dot film 10, and improving the color accuracy of the display device 1000.

[0084] The number of quantum dots in the first quantum hole 6 and the second quantum hole 7 is also set to be the same, or it can be set to be different, which is not limited by the present application. In one embodiment of the present application, the number of first quantum dots 8 in each first quantum hole 6 is N, and the number of second quantum dots 9 in each second quantum hole 7 is M, where N=M. In this way, the number of quantum dots in each first quantum hole 6 and the second quantum hole 7 remains equal, thereby ensuring that the amount of first primary color light and second primary color light formed by excitation in the first quantum hole 6 and the second quantum hole 7 remains equal, thereby improving the uniformity of the mixing of the first primary color light, the second primary color light and the third primary color light, improving the purity of the white light formed by the quantum dot film 10, and improving the color accuracy of the display device 1000.

[0085] Please refer to Figure 7 The present application also proposes a method for manufacturing a quantum dot film, which comprises the following steps:

[0086] S10, forming a second quantum hole on the second functional layer, and filling the second quantum hole with a second quantum dot.

[0087] The second functional layer can have various structures, please refer to Figure 8 In one embodiment of the present application, the second functional layer includes a second sealing layer, a second water and oxygen barrier layer, and a substrate layer. In this structure, forming a second quantum hole on the second functional layer and filling the second quantum hole with a second quantum dot includes the following steps:

[0088] S101a, forming a second water and oxygen barrier layer on the substrate layer.

[0089] The second water and oxygen barrier layer can be coated onto the substrate layer or laminated onto the substrate layer by heating or pressurizing. The substrate layer can be made of at least one of polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC), or a UV-curable acrylic film. The second water and oxygen barrier layer can be made of at least one of a hydrophobic coating formed by modifying epoxy resin, polyurethane, or acrylic acid with a fluororesin or a high-Tg (glass transition temperature) methacrylate.

[0090] S102a, forming a second quantum hole on the second water and oxygen barrier layer.

[0091] There are many ways to form the second quantum hole on the second water and oxygen barrier layer. In one embodiment of the present application, forming the second quantum hole on the second water and oxygen barrier layer includes the following steps:

[0092] S1021a, coating a second photoresist layer on the side of the second water and oxygen barrier layer facing away from the substrate layer.

[0093] The second photoresist layer can be coated on the first water and oxygen barrier layer, or can be laminated on the first water and oxygen barrier layer by heating or pressurizing, and this application does not impose any restrictions on this.

[0094] S1022a, exposing, developing, and etching the second photoresist layer to form a second quantum hole in the first water and oxygen barrier layer.

[0095] Please refer to Figure 9 Before this step begins, a second light shielding plate 2000b is prefabricated. It is provided with second exposure holes 2100b. The locations of the second exposure holes 2100b on the second light shielding plate 2000b correspond one-to-one with the locations of the second quantum holes 7 on the first water and oxygen barrier layer 2. Subsequently, the second light shielding plate 2000b is positioned between the photoresist and the exposure source to perform the exposure operation. During exposure, light from the exposure source passes through the second exposure holes 2100b on the second light shielding plate 2000b and irradiates the second photoresist layer 3000b, causing a chemical reaction in specific areas of the second photoresist layer 3000b. After exposure is complete, the second photoresist layer 3000b is developed using a suitable developer to remove the unreacted photoresist portions, exposing the first water and oxygen barrier layer 2. Finally, the portion of the first water and oxygen barrier layer 2 protected by the second photoresist layer 3000 b is removed by an etching process (such as wet etching or dry etching) to form a second quantum hole 7 .

[0096] S1023a, cleaning the second photoresist layer.

[0097] The second photoresist layer can be cleaned by spraying photoresist liquid, or removed by other chemical or mechanical methods, which is not limited in this application.

[0098] In other possible implementations of the present application, the first quantum hole can also be formed on the second water and oxygen barrier layer by chemical etching or 3D printing.

[0099] S103a, filling the second quantum hole with a second quantum dot.

[0100] There are many ways to fill the second quantum hole with the second quantum dots. In one embodiment of the present application, before the manufacture of the quantum dot film begins, the second quantum dot liquid (i.e., a mixture of the second quantum dots and water or an organic solvent) is pre-configured. After the second quantum hole is formed, the second quantum dots can be filled in the second quantum hole by coating the second quantum dot liquid on the second water and oxygen barrier layer.

[0101] In other possible embodiments of the present application, the second quantum dots can be precisely deposited into the second quantum well using inkjet printing technology, spraying the second quantum dot liquid in the form of droplets. Alternatively, a capillary action method can be used, where a hydrophilic or oleophilic film is coated on one side of the second water and oxygen barrier layer, and the second quantum dot liquid is then dropwise deposited onto the film. Due to capillary action, the second quantum dot liquid spontaneously permeates through the film into the second quantum well, thereby filling the second quantum well with the second quantum dots.

[0102] S104a, forming a second sealing layer on the second water and oxygen barrier layer.

[0103] The second sealing layer can be coated on the second water and oxygen barrier layer, or can be laminated on the second water and oxygen barrier layer by heating or pressurizing, which is not limited in this application. The material of the second sealing layer can be epoxy resin or silicone resin, which is not limited in this application.

[0104] Please refer to Figure 10 In other possible implementations of the present application, the second functional layer may also include a second water and oxygen barrier layer and a second sealing layer stacked in layers. In this structure, forming a second quantum hole on the second functional layer and filling the second quantum hole with a second quantum dot may include the following steps:

[0105] S101b, forming a second quantum hole on the second water and oxygen barrier layer.

[0106] S102b, filling the second quantum hole with a second quantum dot.

[0107] S103b, forming a second sealing layer on one side of the second water and oxygen barrier layer.

[0108] The second functional layer required by the present application can also be formed in the above manner, and the material selection of the second water and oxygen barrier layer, the formation of the second quantum holes, and the filling of the second quantum dots are the same as those in the above embodiment, and will not be described in detail in this application.

[0109] S20, forming a first quantum hole on the first functional layer, and filling the first quantum hole with a first quantum dot.

[0110] The structure of the first functional layer can be various, please refer to Figure 11 In one embodiment of the present application, the first functional layer includes a first sealing layer and a first water and oxygen barrier layer stacked in layers. In this structure, forming a first quantum hole on the first functional layer and filling the first quantum hole with a first quantum dot includes the following steps:

[0111] S201a, forming a second quantum hole on the first water and oxygen barrier layer.

[0112] Please refer to Figure 12 There are many ways to form the first quantum hole on the first water and oxygen barrier layer. In one embodiment of the present application, forming the first quantum hole on the first water and oxygen barrier layer includes the following steps:

[0113] S1021a, coating a first photoresist layer on one side of the first water and oxygen barrier layer.

[0114] The first photoresist layer can be coated on the first water and oxygen barrier layer, or can be laminated on the first water and oxygen barrier layer by heating or pressurizing, which is not limited in this application.

[0115] S1022a, exposing, developing, and etching the first photoresist layer to form a first quantum hole in the first water and oxygen barrier layer.

[0116] Please refer to Figure 13 Before this step begins, a first light shielding plate 2000a is prefabricated. First exposure holes 2100a are defined on the first light shielding plate 2000a. The locations of the first exposure holes 2100a on the first light shielding plate 2000a correspond to the locations of the first quantum holes 6 on the first water and oxygen barrier layer 2. Subsequently, the first light shielding plate 2000a is positioned between the photoresist and the exposure source to perform an exposure operation. During exposure, light from the exposure source passes through the first exposure holes 2100a on the first light shielding plate 2000a and irradiates the first photoresist layer 3000a, causing a chemical reaction in specific regions of the first photoresist layer 3000a. After exposure, the first photoresist layer 3000a is developed using a suitable developer to remove the unreacted photoresist portions, exposing the water and oxygen barrier layer. Finally, an etching process (such as wet or dry etching) is used to remove the portions of the water and oxygen barrier layer protected by the photoresist layer, forming the first quantum holes 6.

[0117] S1023a, cleaning the second photoresist layer.

[0118] The second photoresist layer can be cleaned by spraying photoresist liquid, or removed by other chemical or mechanical methods, which is not limited in this application.

[0119] In other possible implementations of the present application, the first quantum hole can also be formed on the second water and oxygen barrier layer by chemical etching or 3D printing.

[0120] S202a, filling the first quantum hole with a first quantum dot.

[0121] There are many ways to fill the first quantum dots into the first quantum hole. In one embodiment of the present application, before the manufacture of the quantum dot film begins, the first quantum dot liquid (i.e., a mixture of the first quantum dots and water or an organic solvent) is pre-configured. After the first quantum hole is formed, the first quantum dots can be filled into the first quantum hole by coating the first quantum dot liquid on the first water and oxygen barrier layer.

[0122] In other possible embodiments of the present application, the first quantum dots can be precisely deposited into the first quantum pore using inkjet printing technology, where the first quantum dot liquid is precisely sprayed into the first quantum pore in the form of droplets. Alternatively, a capillary action method can be used, where a hydrophilic or oleophilic film is coated on one side of the first water and oxygen barrier layer, and the first quantum dot liquid is then dropwise deposited onto the film. Due to capillary action, the first quantum dot liquid spontaneously permeates through the film into the first quantum pore, thereby filling the first quantum pore with the first quantum dots.

[0123] S203a, forming a first sealing layer on the first water and oxygen barrier layer.

[0124] The first sealing layer can be coated on the first water and oxygen barrier layer, or can be laminated on the first water and oxygen barrier layer by heating or pressurizing, which is not limited in this application. The material of the first sealing layer can be epoxy resin or silicone resin, which is not limited in this application.

[0125] Please refer to Figure 14 In another embodiment of the present application, the first functional layer includes a first sealing layer, a first water and oxygen barrier layer, and a substrate layer. In this structure, forming a first quantum hole on the first functional layer and filling the first quantum hole with a first quantum dot includes the following steps:

[0126] S201b, forming a first water and oxygen barrier layer on the substrate layer.

[0127] S202b, forming a first quantum hole on the first water and oxygen barrier layer, and filling the first quantum hole with a first quantum dot.

[0128] S203b, forming a first sealing layer on the side of the first water and oxygen barrier layer facing away from the substrate layer.

[0129] The second functional layer required by the present application can also be formed in the above manner, and the material selection of the first water and oxygen barrier layer and the substrate layer, the forming of the first quantum hole, and the filling of the first quantum dots are the same as those in the above embodiment, and this application will not repeat them one by one here.

[0130] S30 , stacking the first functional layer on the second functional layer.

[0131] The second water and oxygen barrier layer is connected to the first sealing layer, thereby laminating the first functional layer on the second functional layer.

[0132] In the technical solution of this application, the method for manufacturing a quantum dot film includes forming a second quantum hole on a second functional layer and filling the second quantum hole with a second quantum dot; forming a first quantum hole on a first functional layer and filling the first quantum hole with a first quantum dot; and stacking the first functional layer on the second functional layer. In this method, the overlap area between the first and second quantum dots along the thickness of the quantum dot film is zero. This minimizes unnecessary interaction between the third primary color of the light source and the first and second quantum dots when passing through the quantum dot film, avoiding color distortion and brightness reduction caused by spectral overlap between the first and second quantum dots, improving the light purity of the second and third primary colors, and enhancing the color accuracy of the display device.

[0133] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" are based on the orientation or positional relationship described in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0134] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present application are still within the scope covered by the present application.

Claims

1. A quantum dot film, characterized in that The quantum dot film includes a stacked first functional layer and a second functional layer; the first functional layer is provided with a first quantum hole, and the first quantum hole is provided with a plurality of first quantum dots, and the plurality of first quantum dots are arranged in sequence in the thickness direction of the quantum dot film, and the first quantum dots are used to excite and form a first primary color light; The second functional layer is provided with a second quantum hole, wherein a plurality of second quantum dots are provided in the second quantum hole, and the plurality of second quantum dots are sequentially arranged in the thickness direction of the quantum dot film, and the second quantum dots are used for exciting to form a second primary color light; along the thickness direction of the quantum dot film, the overlapping area of ​​the projections of the first quantum dots and the second quantum dots is 0; Along the thickness direction of the quantum dot film, the projected aperture of the first quantum hole is A, the projected aperture of the second quantum hole is B, the distance between the projections of adjacent first quantum holes and second quantum holes is C, and A>C>B.

2. The quantum dot film according to claim 1, wherein The number of the first quantum dots in each of the first quantum holes is N, and the number of the second quantum dots in each of the second quantum holes is M, where N=M.

3. The quantum dot film according to any one of claims 1 to 2, wherein: The first functional layer includes a first sealing layer and a first water and oxygen barrier layer stacked together, and the first water and oxygen barrier layer is connected to the second functional layer; The first quantum hole is provided in the first water and oxygen barrier layer.

4. The quantum dot film according to claim 3, wherein The second functional layer includes a second sealing layer, a second water and oxygen barrier layer, and a substrate layer that are stacked; the second sealing layer is used to connect with the first water and oxygen barrier layer; The second quantum hole is provided in the second water and oxygen barrier layer.

5. A method for producing a quantum dot film, characterized in that: The method for preparing the quantum dot film comprises the following steps: forming a second quantum hole on the second functional layer, and filling the second quantum hole with a plurality of second quantum dots, wherein the plurality of second quantum dots are sequentially arranged in the thickness direction of the quantum dot film; A first quantum hole is formed on the first functional layer, and a plurality of first quantum dots are filled in the first quantum hole. The plurality of first quantum dots are arranged sequentially in the thickness direction of the quantum dot film, and the second quantum dots are used to excite and form a second primary color light. Along the thickness direction of the quantum dot film, the overlapping area of ​​the projections of the first quantum dots and the second quantum dots is zero; stacking the first functional layer on the second functional layer; Along the thickness direction of the quantum dot film, the projected aperture of the first quantum hole is A, the projected aperture of the second quantum hole is B, the distance between the projections of adjacent first quantum holes and second quantum holes is C, and A>C>B.

6. The method for producing a quantum dot film according to claim 5, wherein: The second functional layer includes a second sealing layer, a second water and oxygen barrier layer and a substrate layer which are stacked; The step of forming a second quantum hole on the second functional layer and filling the second quantum hole with a second quantum dot comprises the following steps: forming the second water and oxygen barrier layer on the substrate layer; forming a second quantum hole on the second water and oxygen barrier layer, and coating a second quantum dot liquid on the side of the second water and oxygen barrier layer away from the substrate layer, so that the second quantum dot is filled into the second quantum hole; The second sealing layer is formed on the second water and oxygen barrier layer.

7. The method for producing a quantum dot film according to claim 6, wherein: The first functional layer includes a first sealing layer and a first water and oxygen barrier layer stacked in layers, a first quantum hole is formed on the first functional layer, and a first quantum dot is filled in the first quantum hole, comprising the following steps: forming a first water and oxygen barrier layer on the second sealing layer; forming a first quantum hole on the first water and oxygen barrier layer, and coating a first quantum dot liquid on a side of the first water and oxygen barrier layer away from the second sealing layer, so that the first quantum dot is filled into the first quantum hole; A first sealing layer is formed on the first water and oxygen barrier layer.

8. A display device, characterized in that: The invention comprises the quantum dot film according to any one of claims 1 to 4.

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