Quantum dot display unit and preparation method thereof

Abstract

The invention discloses a quantum dot display unit and a preparation method thereof. A sapphire substrate is provided with a groove and is filled with a filtering material to form a filtering unit; and arranging a water-oxygen blocking layer on the surface of the substrate to cover the light filtering unit. The light filtering material is arranged in the groove, the thermal expansion matching performance of the light filtering material is optimized, meanwhile, the smoothness of the sapphire substrate is beneficial to relieving stress concentration of the water and oxygen blocking layer, the adhesion and deposition uniformity of the water and oxygen blocking layer and the substrate are improved, and therefore the defects of the water and oxygen blocking layer are overcome. The optimization measures jointly act to improve the stability and reliability of the quantum dot display unit, the problem that in the prior art, the service life of the quantum dot display unit is shortened due to film layer stripping, cracking and the like is hopefully solved, and development and application of the quantum dot display technology are promoted.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a quantum dot display unit and a method for preparing the same. Background Art

[0002] Quantum dot display is a new display technology that uses quantum dot materials to enhance color performance. In this type of display, quantum dot materials, as a key component, can absorb light and re-emit light of different wavelengths. This feature enables the display to achieve a wider color gamut and more accurate color reproduction, providing more realistic and vivid image effects. In addition, by adding quantum dot materials to the display, the demand for multi-color light-emitting units can be reduced, and full-color display can be achieved with only monochrome light-emitting units, which has significant advantages in reducing production costs and improving production efficiency. Quantum dot displays, with their high brightness, high contrast and long life, show broad application prospects in high-end TVs, monitors and mobile devices.

[0003] In the process of preparing quantum dot display units, due to the high demand for water and oxygen barrier of quantum dot materials, inorganic film layers have to be introduced before and after the quantum dot materials for encapsulation to achieve water and oxygen barrier of quantum dot materials and improve the service life of quantum dot materials. However, due to the mismatch of thermal expansion coefficients between film layers and stress concentration, the water and oxygen barrier layer covering the quantum dot material is prone to film peeling and cracking. Summary of the invention

[0004] The purpose of the present application is to provide a quantum dot display unit and a method for preparing the same, which can improve the above-mentioned problems.

[0005] The embodiment of the present application is implemented as follows:

[0006] In a first aspect, the present application provides a method for preparing a quantum dot display unit, comprising steps S1 to S5, wherein S1, S2, etc. are merely step identifiers, and the execution order of the method is not necessarily in ascending order of numbers, for example, step S2 may be executed first and then step S1, and the present application does not impose any limitation thereto.

[0007] S1, providing a sapphire substrate, opening M grooves on the sapphire substrate, where M is a positive integer greater than 2, and filling the grooves with corresponding filter materials, so that the filter material in each groove constitutes a filter unit;

[0008] S2, disposing a first water and oxygen barrier layer on the surface of the sapphire substrate to cover the filter unit;

[0009] S3, preparing a quantum dot unit on the first water and oxygen barrier layer, so that the orthographic projection area of ​​the quantum dot unit on the sapphire substrate falls within the coverage range of the target filter unit;

[0010] S4, preparing a second water and oxygen barrier layer on the quantum dot unit, fixing M light-emitting units on the second water and oxygen barrier layer, wherein the orthographic projection area of ​​the light-emitting unit on the second water and oxygen barrier layer falls within the orthographic projection area of ​​the corresponding filter unit;

[0011] S5, cutting each layer structure along the light emitting main optical axis direction of the light emitting unit to separate each display unit, and preparing signal contact pads connected to each light emitting unit on the display unit.

[0012] It can be understood that the present application provides a method for preparing a quantum dot display unit, including: opening a groove on a sapphire substrate and filling a filter material to form a filter unit; setting a first water and oxygen barrier layer on the surface of the substrate to cover the filter unit; preparing a quantum dot unit on the first water and oxygen barrier layer to ensure that its projection falls within the target filter unit range; then preparing a second water and oxygen barrier layer and fixing the light-emitting unit so that the projection of the light-emitting unit is aligned with the corresponding filter unit; finally, cutting off each layer structure to separate the display unit, and preparing a signal contact pad connected to the light-emitting unit. The present application optimizes the thermal expansion matching of the filter material by placing the filter material in the groove. At the same time, the flatness of the sapphire substrate helps to alleviate the stress concentration of the water and oxygen barrier layer, improve its adhesion to the substrate and deposition uniformity, thereby improving the defects of the water and oxygen barrier layer. These optimization measures work together to improve the stability and reliability of the quantum dot display unit, and are expected to solve the problem of shortened life of the quantum dot display unit due to film peeling, cracking and other problems in the prior art, and promote the development and application of quantum dot display technology.

[0013] In an optional embodiment of the present application, the groove includes at least one of the following:

[0014] The bottom surface of the groove is circular, elliptical or rectangular; the shape can also be circular / elliptical, etc., and the smooth edge is more conducive to improving stress concentration.

[0015] In a direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the cross-section of the groove has a consistent shape.

[0016] In the direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the cross-sectional dimensions of the groove are consistent. The size of the groove on the light incident surface of the sapphire substrate can be adjusted according to the size of the light emitting unit and can be slightly larger than the light emitting unit.

[0017] In the direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the size of the cross section of the groove gradually increases. The groove is designed to be a terraced shape, which can increase the light emitting surface of the light emitting unit.

[0018] The groove is a hemispherical groove protruding toward the light-emitting surface of the sapphire substrate. It can be understood that the hemispherical groove is more conducive to improving the stress concentration problem. Optionally, the refractive index of the filter material is greater than the refractive index of the sapphire substrate, so that the light beam emitted from the quantum dot unit will be refracted, thereby reducing the light emission angle, which is conducive to being coupled into the waveguide for transmission, as a light source device for augmented reality glasses products.

[0019] In an optional embodiment of the present application, a microstructure is provided at the bottom of the groove to improve the light extraction efficiency of the light emitting unit.

[0020] In an optional embodiment of the present application, each of the display units includes at least one of the following:

[0021] at least one blue light filter unit, at least one green light filter unit, and at least one red light filter unit;

[0022] at least one blue light filter unit and at least one yellow light filter unit;

[0023] At least two same-band filter units.

[0024] In an optional embodiment of the present application, the target filter unit is at least one of the following:

[0025] Green light filter unit; red light filter unit; yellow light filter unit.

[0026] In an optional embodiment of the present application, each of the display units includes at least one of the following:

[0027] The filter units are all consistent in size and shape. It can be understood that designing a consistent size and shape is beneficial to improving manufacturing efficiency and reducing manufacturing costs.

[0028] The filter units are symmetrically arranged, which is beneficial to the subsequent dispersion of film layer stress.

[0029] The spacing between two adjacent filter units is equal, which can further facilitate the subsequent dispersion of film layer stress.

[0030] In an optional embodiment of the present application, the first water and oxygen barrier layer and / or the second water and oxygen barrier layer comprises at least one of the following:

[0031] The first water and oxygen barrier layer and / or the second water and oxygen barrier layer is an Al2O3 film layer, which ensures excellent water and oxygen barrier effect.

[0032] The first water and oxygen barrier layer and / or the second water and oxygen barrier layer are Al2O3 film layers and SiO3 film layers sequentially stacked along the direction from the light exiting surface to the light incident surface of the sapphire substrate. x The film layer not only meets the water and oxygen barrier effect, but also utilizes SiO x The film layer improves the substrate adhesion of subsequent organic film layers.

[0033] The first water and oxygen barrier layer and / or the second water and oxygen barrier layer are high refractive index film layers and low refractive index film layers alternately stacked along the direction from the light exit surface to the light incident surface of the sapphire substrate. Optionally, the high refractive index film layer is an Al2O3 film layer, and the low refractive index film layer is a MgF2 film layer. In addition, by adjusting the film thickness, the reflection loss can be reduced and the optical transmittance can be improved for the visible light wavelength range, thereby achieving good anti-reflection performance.

[0034] In a second aspect, the present application discloses a quantum dot display unit, which is prepared by the method described in any one of the first aspects.

[0035] Beneficial effects:

[0036] The present application provides a method for preparing a quantum dot display unit, including: opening a groove on a sapphire substrate and filling a filter material to form a filter unit; setting a first water-oxygen barrier layer on the surface of the substrate to cover the filter unit; preparing a quantum dot unit on the first water-oxygen barrier layer to ensure that its projection falls within the target filter unit range; then preparing a second water-oxygen barrier layer and fixing the light-emitting unit so that the projection of the light-emitting unit is aligned with the corresponding filter unit; finally, cutting off each layer structure to separate the display unit, and preparing a signal contact pad connected to the light-emitting unit. The present application optimizes the thermal expansion matching of the filter material by placing the filter material in the groove. At the same time, the flatness of the sapphire substrate helps to alleviate the stress concentration of the water-oxygen barrier layer, improve its adhesion to the substrate and deposition uniformity, thereby improving the defects of the water-oxygen barrier layer. These optimization measures work together to improve the stability and reliability of the quantum dot display unit, and are expected to solve the problem of shortened life of the quantum dot display unit due to film peeling, cracking and other problems in the prior art, and promote the development and application of quantum dot display technology.

[0037] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, optional embodiments are specifically listed below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figures 1 to 4 It is a schematic diagram of the steps of a method for preparing a quantum dot display unit provided in the present application;

[0040] Figure 5 2. It is a schematic diagram of the structure of the first water and oxygen barrier layer which is an alternately stacked high refractive index film layer and a low refractive index film layer;

[0041] Figure 6 is a schematic structural diagram of a second target display unit;

[0042] Figure 7 is a schematic structural diagram of a third target display unit;

[0043] Figure 8 It is a schematic diagram of a structure in which a terrace-shaped groove is provided on a sapphire substrate;

[0044] Fig. 9 It is a schematic diagram of a structure in which a hemispherical groove is opened on a sapphire substrate;

[0045] Fig.10 is a schematic diagram of symmetrically arranged filter units;

[0046] Fig.11 It is a schematic diagram of equidistantly arranged filter units. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] In a first aspect, the present application provides a method for preparing a quantum dot display unit, comprising steps S1 to S5, wherein S1, S2, etc. are merely step identifiers, and the execution order of the method is not necessarily in ascending order of numbers, for example, step S2 may be executed first and then step S1, and the present application does not impose any limitation thereto.

[0049] S1, providing a sapphire substrate, opening M grooves on the sapphire substrate, where M is a positive integer greater than 2, and filling the grooves with corresponding filter materials, so that the filter material in each groove constitutes a filter unit.

[0050] For example, Figure 1A partial schematic diagram of a sapphire substrate 10 is shown. In the figure, three grooves are opened on the sapphire substrate 10, namely a first groove 11, a second groove 12 and a third groove 13; a blue light transmissive material, i.e., a material that can only transmit a blue light band light beam, is filled into the first groove 11 to form a blue light filter unit 21; a green light transmissive material 22, i.e., a material that can only transmit a green light band light beam, is filled into the second groove 12 to form a green light filter unit 22; a red light transmissive material 23, i.e., a material that can only transmit a red light band light beam, is filled into the third groove 13 to form a red light filter unit 23.

[0051] S2, disposing a first water and oxygen barrier layer on the surface of the sapphire substrate to cover the filter unit.

[0052] like Figure 2 As shown, a first water and oxygen barrier layer 20 is disposed on the light incident surface 101 of the sapphire substrate 10 to cover each filter unit.

[0053] In an optional embodiment of the present application, the first water and oxygen barrier layer includes at least one of the following:

[0054] The first water and oxygen barrier layer is an Al2O3 film layer, which ensures excellent water and oxygen barrier effect.

[0055] The first water and oxygen barrier layer is an Al2O3 film layer and a SiO2 film layer stacked in sequence from the light-emitting surface to the light-incident surface of the sapphire substrate. x The film layer not only meets the water and oxygen barrier effect, but also utilizes SiO x The film layer improves the substrate adhesion of subsequent organic film layers.

[0056] The first water and oxygen barrier layer is a high refractive index film layer and a low refractive index film layer alternately stacked along the direction from the light exiting surface to the light incident surface of the sapphire substrate. Optionally, the high refractive index film layer is an Al2O3 film layer, and the low refractive index film layer is a MgF2 film layer. In addition, by adjusting the film thickness, the reflection loss can be reduced and the optical transmittance can be improved for the visible light wavelength range, thereby achieving good anti-reflection performance. Figure 5 As shown, Al2O3 film layers and MgF2 film layers are alternately stacked on the sapphire substrate 10 as the first water and oxygen barrier layer 20.

[0057] S3, preparing a quantum dot unit on the first water and oxygen barrier layer, so that the orthographic projection area of ​​the quantum dot unit on the sapphire substrate falls within the coverage range of the target filter unit.

[0058] like Figure 2As shown, two quantum dot units, namely, a red light quantum dot unit 31 and a green light quantum dot unit 32, are prepared on the first water and oxygen barrier layer 20; the red light quantum dot unit 31 falls within the coverage of the red light filter unit 23 in the orthographic projection area of ​​the sapphire substrate 10, and the green light quantum dot unit 32 falls within the coverage of the green light filter unit 22 in the orthographic projection area of ​​the sapphire substrate 10. In addition, a light-transmitting material unit 33 may be provided on the first water and oxygen barrier layer 20, and the light-transmitting material unit 33 falls within the coverage of the blue light filter unit 21 in the orthographic projection area of ​​the sapphire substrate 10.

[0059] S4, preparing a second water and oxygen barrier layer on the quantum dot unit, fixing M light-emitting units on the second water and oxygen barrier layer, and the orthographic projection area of ​​the light-emitting unit in the second water and oxygen barrier layer falls within the orthographic projection area of ​​the corresponding filter unit.

[0060] Optionally, a transparent adhesive layer may be provided on the second water and oxygen barrier layer to fix the light-emitting unit.

[0061] In an optional embodiment of the present application, the second water and oxygen barrier layer includes at least one of the following:

[0062] The second water and oxygen barrier layer is an Al2O3 film layer, which ensures excellent water and oxygen barrier effect.

[0063] The second water and oxygen barrier layer is an Al2O3 film layer and a SiO2 film layer stacked in sequence from the light-emitting surface to the light-incident surface of the sapphire substrate. x The film layer not only meets the water and oxygen barrier effect, but also utilizes SiO x The film layer improves the substrate adhesion of subsequent organic film layers.

[0064] The second water and oxygen barrier layer is a high refractive index film layer and a low refractive index film layer alternately stacked along the direction from the light exiting surface to the light incident surface of the sapphire substrate. Optionally, the high refractive index film layer is an Al2O3 film layer, and the low refractive index film layer is a MgF2 film layer. In addition, by adjusting the film thickness, the reflection loss can be reduced and the optical transmittance can be improved for the visible light wavelength range, thereby achieving good anti-reflection performance.

[0065] like Figure 3As shown, a second water and oxygen barrier layer 40 is prepared on each quantum dot unit, and three light-emitting units are fixed on the second water and oxygen barrier layer 40 of the part shown in the figure, namely, a first light-emitting unit 51, a second light-emitting unit 52 and a third light-emitting unit 53. The three light-emitting units can all be blue light LED chips, wherein the blue light beam emitted by the first light-emitting unit 51 passes through the above-mentioned light-transmitting material unit 33, and is output as a purer blue light by the blue light filter unit 21; the blue light beam emitted by the second light-emitting unit 52 passes through the above-mentioned green light quantum dot unit 32 and is converted into green light, and then the stray light that fails to be converted is filtered out by the green light filter unit 22, and a purer green light is output; the blue light beam emitted by the third light-emitting unit 53 passes through the above-mentioned red light quantum dot unit 31 and is converted into red light, and then the stray light that fails to be converted is filtered out by the green-red light filter unit 23, and a purer red light is output.

[0066] Optionally, in order to prevent crosstalk between the red light, green light and blue light converted by quantum dots, black glue 41 may be filled between each quantum dot unit, such as Figure 3 shown.

[0067] S5, cutting each layer structure along the light emitting main optical axis direction of the light emitting unit to separate each display unit, and preparing signal contact pads connected to each light emitting unit on the display unit.

[0068] Optionally, after executing step S4, the spaces between the light-emitting units may be filled with packaging glue 42, such as Figure 3 shown.

[0069] like Figure 4 As shown, each layer structure is cut along the dotted line direction to separate each display unit, and the first target display unit 100 in the figure is one of the display units.

[0070] In an optional embodiment of the present application, the above-mentioned preparation of signal contact pads connecting each light-emitting unit on the display unit includes the following steps: using an insulating material to coat the surface of the light-emitting unit to form an insulating material layer; punching the insulating material layer to expose each electrode of the light-emitting unit; and preparing signal contact pads connecting the electrodes on the surface of the insulating material layer to obtain each quantum dot display unit.

[0071] It can be understood that the present application provides a method for preparing a quantum dot display unit, including: opening a groove on a sapphire substrate and filling a filter material to form a filter unit; setting a first water and oxygen barrier layer on the surface of the substrate to cover the filter unit; preparing a quantum dot unit on the first water and oxygen barrier layer to ensure that its projection falls within the target filter unit range; then preparing a second water and oxygen barrier layer and fixing the light-emitting unit so that the projection of the light-emitting unit is aligned with the corresponding filter unit; finally, cutting off each layer structure to separate the display unit, and preparing a signal contact pad connected to the light-emitting unit. The present application optimizes the thermal expansion matching of the filter material by placing the filter material in the groove. At the same time, the flatness of the sapphire substrate helps to alleviate the stress concentration of the water and oxygen barrier layer, improve its adhesion to the substrate and deposition uniformity, thereby improving the defects of the water and oxygen barrier layer. These optimization measures work together to improve the stability and reliability of the quantum dot display unit, and are expected to solve the problem of shortened life of the quantum dot display unit due to film peeling, cracking and other problems in the prior art, and promote the development and application of quantum dot display technology.

[0072] In an optional embodiment of the present application, each display unit includes at least one of the following situations.

[0073] Each display unit includes at least one blue light filter unit, at least one green light filter unit, and at least one red light filter unit. Figure 4 The first target display unit 100 shown is a full-color display unit, including a blue light filter unit 21 , a green light filter unit 22 , and a red light filter unit 23 .

[0074] Each display unit includes at least one blue light filter unit and at least one yellow light filter unit. Figure 6 The second target display unit 200 shown is also a full-color display unit, including a blue light filter unit 21 and a yellow light filter unit 24; wherein the red light beam emitted by the red light quantum dot unit 31 and the green light beam emitted by the green light quantum dot unit 32 are both filtered by the above-mentioned yellow light filter unit 24, and the light beam portion whose wavelength conversion is unsuccessful is excluded.

[0075] Each display unit includes a filter unit with the same wavelength band. Figure 7 The third target display unit 300 shown is a monochrome display unit, which only outputs a red light beam through the red light quantum dot unit 31 , and therefore only includes a single red light filter unit 23 .

[0076] In an optional embodiment of the present application, the groove includes at least one of the following:

[0077] The bottom surface of the groove is circular, elliptical or rectangular; the shape can also be circular or elliptical, and the smooth edge is more conducive to improving stress concentration.

[0078] In a direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the cross-section of the groove has a consistent shape.

[0079] In the direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the cross-sectional dimensions of the groove are consistent. The size of the groove on the light incident surface of the sapphire substrate can be adjusted according to the size of the subsequent light emitting unit and can be slightly larger than the light emitting unit.

[0080] In the direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the cross-sectional size of the groove gradually increases, and the groove is designed as a terraced shape, which can increase the light emitting surface of the light emitting unit. Figure 8 As shown, in the direction from the light incident surface 101 to the light emitting surface 102 , the cross-sectional size of each groove gradually increases.

[0081] The groove is a hemispherical groove protruding toward the light-emitting surface of the sapphire substrate. It can be understood that the hemispherical groove is more conducive to improving the stress concentration problem. Optionally, the refractive index of the filter material is greater than the refractive index of the sapphire substrate, so that the light beam emitted from the quantum dot unit will be refracted, thereby reducing the light emission angle, which is conducive to being coupled into the waveguide for transmission, as a light source device for augmented reality glasses products. Fig. 9 As shown, the three grooves in the sapphire substrate 10 are all hemispherical grooves 14, and each hemispherical groove 14 is filled with a filter material with a higher refractive index than the sapphire substrate. After the wavelength of the light beam emitted by the light-emitting unit is converted by the quantum dot unit, the light beam emitted from the quantum dot unit will be refracted, thereby reducing the light output angle.

[0082] In an optional embodiment of the present application, a microstructure is provided at the bottom of the groove to improve the light extraction efficiency of the light emitting unit.

[0083] In an optional embodiment of the present application, each display unit includes at least one of the following:

[0084] The filter units have the same size and shape. It can be understood that designing a consistent size and shape is conducive to improving manufacturing efficiency and reducing manufacturing costs.

[0085] The symmetrical arrangement of the filter units is conducive to the subsequent dispersion of film stress. Fig.10 As shown, the blue light filter unit 21 , the green light filter unit 22 , and the red light filter unit 23 are symmetrically distributed relative to the dotted line.

[0086] The spacing between two adjacent filter units is equal, which can further facilitate the dispersion of subsequent film layer stress. Fig.11 As shown, the distance between the blue light filter unit 21 and the green light filter unit 22 is d1, the distance between the green light filter unit 22 and the red light filter unit 23 is d2, and the distance between the blue light filter unit 21 and the red light filter unit 23 is d3, wherein d1=d2=d3.

[0087] In a second aspect, the present application discloses a quantum dot display unit, which is prepared by the method described in any one of the first aspects.

[0088] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure may modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing an element from other elements. For example, a first user device and a second user device represent different user devices, although both are user devices. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0089] When one element (e.g., a first element) is referred to as being "(operably or communicatively) coupled" or "(operably or communicatively) coupled to" or "connected to" another element (e.g., a second element), it is understood that the one element is directly connected to the other element or the one element is indirectly connected to the other element via yet another element (e.g., a third element). Conversely, it is understood that when an element (e.g., a first element) is referred to as being "directly connected" or "directly coupled" to another element (the second element), no element (e.g., a third element) is interposed between the two.

[0090] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0091] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0092] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0093] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0094] The above description is only an optional embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a quantum dot display unit, characterized in that: include: S1, providing a sapphire substrate, opening M grooves on the sapphire substrate, where M is a positive integer greater than 2, and filling the grooves with corresponding filter materials, so that the filter material in each groove constitutes a filter unit; S2, disposing a first water and oxygen barrier layer on the surface of the sapphire substrate to cover the filter unit; S3, preparing a quantum dot unit on the first water and oxygen barrier layer, so that the orthographic projection area of ​​the quantum dot unit on the sapphire substrate falls within the coverage range of the target filter unit; S4, preparing a second water and oxygen barrier layer on the quantum dot unit, fixing M light-emitting units on the second water and oxygen barrier layer, wherein the orthographic projection area of ​​the light-emitting unit on the second water and oxygen barrier layer falls within the orthographic projection area of ​​the corresponding filter unit; S5, cutting each layer structure along the light emitting main optical axis direction of the light emitting unit to separate each display unit, and preparing signal contact pads connected to each light emitting unit on the display unit.

2. The method for preparing a quantum dot display unit according to claim 1, characterized in that: The groove includes at least one of the following: The bottom surface of the groove is circular, elliptical or rectangular; In a direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the cross-section of the groove has a consistent shape; In a direction perpendicular to the sapphire substrate and from the light incident surface to the light emitting surface, the cross-section of the groove has a uniform size; In a direction perpendicular to the sapphire substrate and from the light incident surface to the light exit surface, the size of the cross section of the groove gradually increases; The groove is a hemispherical groove protruding toward the light-emitting surface of the sapphire substrate.

3. The method for preparing a quantum dot display unit according to claim 2, characterized in that: A microstructure is arranged at the bottom of the groove to improve the light extraction efficiency of the light emitting unit.

4. The method for preparing a quantum dot display unit according to claim 2, characterized in that: The refractive index of the filter material is greater than the refractive index of the sapphire substrate.

5. The method for preparing a quantum dot display unit according to any one of claims 1 to 4, characterized in that: Each of the display units includes at least one of the following: at least one blue light filter unit, at least one green light filter unit, and at least one red light filter unit; at least one blue light filter unit and at least one yellow light filter unit; At least two same-band filter units.

6. The method for preparing a quantum dot display unit according to claim 5, characterized in that: The target filter unit is at least one of the following: Green light filter unit; red light filter unit; yellow light filter unit.

7. The method for preparing a quantum dot display unit according to claim 5, characterized in that: Each of the display units includes at least one of the following: The filter units are of the same size and shape; The filter units are arranged symmetrically; The distances between two adjacent filter units are equal.

8. The method for preparing a quantum dot display unit according to claim 1, characterized in that: The first water and oxygen barrier layer and / or the second water and oxygen barrier layer comprises at least one of the following: The first water-oxygen barrier layer and / or the second water-oxygen barrier layer is an Al2O3 film layer; The first water and oxygen barrier layer and / or the second water and oxygen barrier layer are Al2O3 film layers and SiO2 film layers sequentially stacked along the direction from the light exiting surface to the light incident surface of the sapphire substrate. x Membrane layer; The first water and oxygen barrier layer and / or the second water and oxygen barrier layer are high refractive index film layers and low refractive index film layers alternately stacked along the direction from the light exiting surface to the light incident surface of the sapphire substrate.

9. The method for preparing a quantum dot display unit according to claim 8, characterized in that: The high refractive index film layer is an Al2O3 film layer, and the low refractive index film layer is a MgF2 film layer.

10. A quantum dot display unit, characterized in that: Prepared by the method according to any one of claims 1 to 9.

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