Display device and preparation method thereof

Abstract

The invention provides a display device and a preparation method thereof, the display device comprises a color film substrate, an array substrate and a color conversion layer clamped between the color film substrate and the array substrate, the color film substrate comprises a substrate body, color resistance blocks of various colors formed on the substrate body and black matrixes located between the adjacent color resistance blocks; the multiple colors comprise red, green and blue; a plurality of blue light-emitting units arranged in an array are formed on the array substrate, and the blue light-emitting units are in one-to-one correspondence with the color resistance blocks; the color conversion layer comprises a light blocking structure which is formed between the lower surface of the black matrix and the array substrate and used for isolating the blue light-emitting units, and color conversion units located between the color resistance blocks and the corresponding blue light-emitting units. And each color conversion unit is used for converting light rays emitted by the corresponding blue light-emitting unit into light rays with the same color as the color resistance blocks above the blue light-emitting unit. According to the technical scheme provided by the invention, the color crosstalk between the adjacent sub-pixels can be weakened, so that the color gamut is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a method for manufacturing the same. Background Art

[0002] Micro LED display technology is a new generation of semiconductor display technology with the characteristics of low power consumption, high reliability, wide color gamut, high brightness and high contrast.

[0003] In full-color Micro LED display devices, blue light-emitting units are usually used as light sources, and full-color display of the display screen is achieved after quantum dot color conversion. However, Micro LED light-emitting units have strong side emission, which can easily cause color crosstalk between adjacent sub-pixels, resulting in a reduction in color gamut. Summary of the invention

[0004] In view of this, the present application provides a display device and a manufacturing method thereof, which are used to reduce color crosstalk between adjacent sub-pixels and thereby improve the color gamut.

[0005] In order to achieve the above-mentioned objectives, in a first aspect, an embodiment of the present application provides a display device, comprising: a color filter substrate, an array substrate, and a color conversion layer sandwiched between the color filter substrate and the array substrate.

[0006] The color filter substrate comprises a base substrate, color blocks of multiple colors formed on the base substrate, and a black matrix located between adjacent color blocks; the multiple colors include red, green and blue;

[0007] A plurality of blue light-emitting units arranged in an array are formed on the array substrate, and the blue light-emitting units correspond to the color-resistance blocks one by one;

[0008] The color conversion layer includes a light-blocking structure formed between the lower surface of the black matrix and the array substrate for isolating each of the blue light-emitting units, and a color conversion unit located between each of the color resist blocks and the corresponding blue light-emitting units, each of the color conversion units being used to convert the light emitted by the corresponding blue light-emitting unit into light of the same color as the color resist block above it.

[0009] In a possible implementation manner of the first aspect, a surface of the light blocking structure is covered with a reflective layer.

[0010] In a possible implementation manner of the first aspect, a heat conducting layer is disposed on the lower surface of the array substrate, and the reflective layer is connected to the heat conducting layer through a through hole opened on the array substrate.

[0011] In a possible implementation manner of the first aspect, a scattering layer is formed between the color conversion unit and the color resist block and on a side wall of the reflective layer.

[0012] In a possible implementation of the first aspect, a blue light protection layer is further disposed between the green color block and the color conversion unit.

[0013] In a possible implementation of the first aspect, the material of the scattering layer is titanium dioxide, and the material of the anti-blue light layer includes one or more of silicon dioxide, titanium dioxide and magnesium oxide.

[0014] In a possible implementation of the first aspect, the color conversion units corresponding to the red color block and the green color block are both prepared using CdSe / ZnS quantum dots with a core-shell structure, and the quantum dot diameter of the color conversion unit corresponding to the red color block is smaller than the quantum dot diameter of the color conversion unit corresponding to the green color block; the color conversion unit corresponding to the blue color block includes titanium dioxide and acrylic resin.

[0015] In a possible implementation of the first aspect, the light blocking structure is made of a photoresist material, the height of the light blocking structure is not less than 20 micrometers, and the thickness of the color conversion unit is not less than 8 micrometers.

[0016] In a second aspect, an embodiment of the present application provides a method for manufacturing a display device, comprising:

[0017] Forming color blocks of multiple colors and a black matrix between adjacent color blocks on a base substrate; the multiple colors include red, green and blue;

[0018] Prepare blue light-emitting units on the array substrate; the blue light-emitting units correspond to the color-resistance blocks one by one;

[0019] A color conversion layer is formed on the black matrix and the color resist blocks; the color conversion layer includes a light blocking structure formed on the upper surface of the black matrix, and a color conversion unit located above each of the color resist blocks;

[0020] The color conversion layer is aligned with the array substrate so that the color conversion units are arranged corresponding to the blue light emitting units, and each color conversion unit is used to convert the light emitted by the corresponding blue light emitting unit into light of the same color as the color block above it.

[0021] In a possible implementation manner of the second aspect, forming a color conversion layer on the black matrix and the color resist block includes:

[0022] forming the light blocking structure above the black matrix;

[0023] forming a reflective layer on the surface of the light blocking structure;

[0024] A blue light protection layer is formed on top of the green color block;

[0025] Forming a scattering layer on the blue light protection layer, the side wall of the reflective layer, the red color block and the blue color block;

[0026] A color conversion unit is formed above each color block.

[0027] The display device provided by the embodiment of the present application includes: a color filter substrate, an array substrate and a color conversion layer sandwiched between the color filter substrate and the array substrate, the color filter substrate includes a base substrate, color blocks of multiple colors formed on the base substrate and a black matrix located between adjacent color blocks; the multiple colors include red, green and blue; a plurality of blue light-emitting units arranged in an array are formed on the array substrate, and the blue light-emitting units correspond to the color blocks one by one; the color conversion layer includes a light-blocking structure formed between the lower surface of the black matrix and the array substrate for isolating each of the blue light-emitting units, and a color conversion unit located between each of the color block and the corresponding blue light-emitting unit, each of the color conversion units is used to convert the light emitted by the corresponding blue light-emitting unit into light of the same color as the color block above it, and by providing the light-blocking structure and the color block, the color crosstalk between adjacent sub-pixels can be weakened, thereby improving the color gamut.

[0028] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0030] Figure 2 A schematic top view of an array substrate provided in an embodiment of the present application;

[0031] Figure 3 A schematic flow chart of a method for preparing a display device provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the structure of a color filter substrate provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of the structure of an array substrate provided in an embodiment of the present application;

[0034] Figure 6 A schematic flow chart of a first method for preparing a color conversion layer provided in an embodiment of the present application;

[0035] Figure 7 for Figure 6 Schematic diagram of the structure of the corresponding color conversion layer;

[0036] Figure 8 A schematic flow chart of a second method for preparing a color conversion layer provided in an embodiment of the present application;

[0037] Fig. 9 for Figure 8 Schematic diagram of the structure of the corresponding color conversion layer.

[0038] Description of reference numerals:

[0039] 11-base substrate; 12-color block; 121-red color block; 122-green color block; 123-blue color block; 13-black matrix;

[0040] 21-glass substrate; 22-driving layer; 23-blue light-emitting unit; 24-heat-conducting layer; 25-through hole;

[0041] 31 - light blocking structure; 32 - color conversion unit; 321 - red conversion unit; 322 - green conversion unit; 323 - blue conversion unit; 33 - reflection layer; 34 - scattering layer; 35 - blue light protection layer. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0043] The display device may include: a color filter substrate, an array substrate, and a color conversion layer sandwiched between the color filter substrate and the array substrate.

[0044] Figure 1 A schematic diagram of the structure of a display device provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the color filter substrate may include a base substrate 11, color blocks 12 of multiple colors formed on the base substrate 11, and a black matrix 13 located between adjacent color blocks 12. The array substrate may include a glass substrate 21 and a driving layer 22 formed on the glass substrate 21, and a plurality of blue light-emitting units 23 arranged in an array may be formed on the driving layer 22, and the blue light-emitting units 23 may correspond to the color blocks 12 one by one. The color blocks 12 of multiple colors may include a red color block 121, a green color block 122, and a blue color block 123, and each color block 12 defines a sub-pixel area.

[0045] The color block 12 may include organic polymers, multifunctional monomers, photoinitiators, additives and solvents, etc., which may allow light of a specific wavelength to pass through the color block 12, thereby achieving light filtering. By providing the color block 12, color mixing may be reduced, and the color gamut and color performance of the display screen may be improved. The black matrix 13 may be prepared using materials such as carbon black, black photoresist, pigment dispersion composition, polymers, etc., to further reduce the blue light from entering adjacent sub-pixel regions, thereby improving the contrast and color saturation of the display device.

[0046] Considering that the blue light-emitting unit 23 has strong side emission, the blue light entering other sub-pixel areas will cause color crosstalk. In an optional implementation, a color conversion layer can also be provided between the color filter substrate and the array substrate. The color conversion layer may include a light-blocking structure 31 formed between the lower surface of the black matrix 13 and the driving layer 22 for isolating each blue light-emitting unit 23, and a color conversion unit 32 located between each color block 12 and the corresponding blue light-emitting unit 23, each color conversion unit 32 being used to convert the light emitted by the corresponding blue light-emitting unit 23 into light of the same color as the color block 12 above it.

[0047] Specifically, the light blocking structure 31 is in the first direction ( Figure 1 The height in the direction (in the direction shown by X in FIG) may be not less than 20 microns, thereby providing a placement space for the blue light-emitting unit 23. The light-blocking structure 31 may be made of a photoresist material to reduce color crosstalk between adjacent sub-pixel regions. In some embodiments, the light-blocking structure 31 may also be doped with carbon black or carbon quantum dots to further improve the light-blocking effect. In addition, the light-blocking structure 31 may also support the thickness of the display device and improve the pressure resistance of the display device.

[0048] For ease of description, the color conversion unit corresponding to the red color block 121 is referred to as a red conversion unit 321 , the color conversion unit corresponding to the green color block 122 is referred to as a green conversion unit 322 , and the color conversion unit corresponding to the blue color block 123 is referred to as a blue conversion unit 323 .

[0049] The color conversion unit 32 may be a quantum dot ink to improve the dispersion stability of the quantum dots. Among them, the red conversion unit 321 may convert blue light into red light, and the green conversion unit 322 may convert blue light into green light. Both the red conversion unit 321 and the green conversion unit 322 may be prepared using CdSe / ZnS quantum dots with a core-shell structure, and the quantum dot diameter of the red conversion unit 321 may be smaller than the quantum dot diameter of the green conversion unit 322. Blue light may be emitted directly from the blue color block 123, so the blue conversion unit 323 may not contain quantum dot materials, and the blue conversion unit 323 may be prepared by mixing titanium dioxide particles and acrylic resin, and the diameter of the titanium dioxide particles may be exemplarily 50 nanometers to 150 nanometers.

[0050] It can be understood that in some embodiments, titanium dioxide particles can also be doped into the red conversion unit 321 and the green conversion unit 322, so that the titanium dioxide particles can scatter the blue light entering the red conversion unit 321 and the green conversion unit 322, thereby improving the light output uniformity of the red conversion unit 321 and the green conversion unit 322.

[0051] In an optional implementation, a reflective layer 33 may be covered on the surface of the light-blocking structure 31, so that the lateral light of the blue light-emitting unit 23 can be reflected. The material of the reflective layer 33 may be silver. Taking the green sub-pixel as an example, after the reflective layer 33 is set, the reflective layer 33 may reflect the blue light emitted by the blue light-emitting unit 23 to the reflective layer 33, so that more light can enter the green conversion unit 322, and after being converted by the green conversion unit 322, it is emitted from the green color block 122, which can not only improve the utilization rate of light, but also reduce the amount of blue light entering the adjacent sub-pixel area, so as to further reduce the color crosstalk of the blue light to the adjacent sub-pixel area, improve the purity of the light emitted from the green color block 122, and then improve the contrast.

[0052] Since the quantum dot ink is an immersion liquid, it can be well adsorbed on the light blocking structure 31, so that the quantum dot ink appears thin in the middle area and thick in the edge area, and the quantum dots are concentrated in the edge area, so that the central area brightness of the red conversion unit 321 and the green conversion unit 322 is lower than the edge brightness. In the embodiment of the present application, a scattering layer 34 can be formed between the color conversion unit 32 and the color block 12 and on the side wall of the reflective layer 33. The scattering layer 34 can be a titanium dioxide film layer, and the thickness of the film layer can be selected according to actual needs, so as to further improve the light uniformity of the red conversion unit 321 and the green conversion unit 322, thereby improving the display quality of the display screen.

[0053] In some embodiments, an anti-blue light layer 35 may be provided between the green color block 122 and the green conversion unit 322. The anti-blue light layer 35 may include one or more of silicon dioxide, titanium dioxide, and magnesium oxide. The anti-blue light layer 35 may allow the blue light entering the green sub-pixel to be absorbed and scattered by silicon dioxide and titanium dioxide, thereby reducing color crosstalk and improving the color gamut and contrast.

[0054] Taking into account that the blue light-emitting unit 23 will generate a large amount of heat when emitting light, causing the temperature of the display device to rise, especially when the operating temperature of the blue light-emitting unit 23 exceeds the bearing temperature of the internal chip of the blue light-emitting unit 23, the luminous efficiency of the blue light-emitting unit 23 will be rapidly reduced, causing the brightness of the blue light-emitting unit 23 to fluctuate, and accelerate the aging of the blue light-emitting unit 23, and also reduce the stability of the color conversion unit 32.

[0055] In the embodiments of this application, see Figure 1 and Figure 2 As shown. A heat-conducting layer 24 can also be provided on the lower surface of the array substrate, and the reflective layer 33 can be connected to the heat-conducting layer 24 through the through hole 25 provided on the array substrate, so that the heat generated by the blue light-emitting unit 23 can be conducted to the heat-conducting layer 24 for heat dissipation. In some embodiments, the heat-conducting layer 24 can be connected to the back plate of the display device, so as to accelerate the heat dissipation. The material of the heat-conducting layer 24 can be the same as that of the reflective layer 33, so as to improve the production efficiency. Of course, the heat-conducting layer 24 can also be made of other metals, and the embodiments of the present application do not impose any special restrictions on this. By connecting the heat-conducting layer 24 and the reflective layer 33, not only can the display device be cooled, but also the stability of the color conversion unit 32 can be improved, and the service life of the blue light-emitting unit 23 can be extended.

[0056] The display device provided by the embodiment of the present application includes: a color filter substrate, an array substrate and a color conversion layer sandwiched between the color filter substrate and the array substrate, the color filter substrate includes a base substrate, color blocks of multiple colors formed on the base substrate and a black matrix located between adjacent color blocks; the multiple colors include red, green and blue; a plurality of blue light-emitting units arranged in an array are formed on the array substrate, and the blue light-emitting units correspond to the color blocks one by one; the color conversion layer includes a light-blocking structure formed between the lower surface of the black matrix and the array substrate for isolating each blue light-emitting unit, and a color conversion unit located between each color block and the corresponding blue light-emitting unit, each color conversion unit is used to convert the light emitted by the corresponding blue light-emitting unit into light of the same color as the color block above it, and by providing the light-blocking structure and the color block, the color crosstalk between adjacent sub-pixels can be weakened, thereby improving the color gamut.

[0057] Based on the same inventive concept, an embodiment of the present application also provides a method for preparing a display device. Figure 3 This is a schematic diagram of a method for preparing a display device provided in an embodiment of the present application. Figure 3 As shown, the method may include the following steps:

[0058] Step S110: forming color resist blocks of various colors and a black matrix between adjacent color resist blocks on a base substrate.

[0059] A base substrate 11 is provided, a black matrix material layer is formed on the base substrate 11, a photoresist is coated on the black matrix material layer, and a mask is used to pattern the black matrix material layer, thereby forming a black matrix 13 on the base substrate 11, and the black matrix 13 includes a plurality of sub-pixel opening regions. After the black matrix 13 is formed, color blocks 12 of various colors can be formed in the sub-pixel opening regions, respectively, and the color blocks 12 of various colors include a red color block 121, a green color block 122, and a blue color block 123, thereby completing the preparation of the color filter substrate, see Figure 4 .

[0060] Step S120: forming a blue light emitting unit on the array substrate.

[0061] See also Figure 5 The blue light emitting unit 23 can be transferred to the array substrate by mass transfer process, and the blue light emitting unit 23 can be fixed on the driving layer 22 by welding or clamping. A plurality of through holes 25 are formed on the array substrate.

[0062] Step S130: forming a color conversion layer on the black matrix and the color resist blocks.

[0063] In an optional implementation, Figure 6 This is a schematic flow chart of a first method for preparing a color conversion layer provided in an embodiment of the present application. Figure 7 for Figure 6 Schematic diagram of the structure of the corresponding color conversion layer.

[0064] Step S131 , forming a light blocking structure on the black matrix.

[0065] A photoresist material layer and a photoresist are sequentially formed on the black matrix 13 and the color block 12, and then exposure and development are performed through a mask plate to remove the photoresist in the corresponding area above the color block 12, and then dry etching is used to remove the photoresist material layer above the color block 12, thereby forming a light blocking structure 31 on the black matrix 13, see Figure 7 .

[0066] It should be noted that in order not to affect the aperture ratio of the sub-pixel, in the second direction (perpendicular to the first direction, such as Figure 1In the direction indicated by Y in FIG. 1 , the projection width of the light blocking structure 31 on the base substrate 11 may be smaller than the projection width of the corresponding black matrix 13 on the base substrate 11 .

[0067] Step S132: forming a color conversion unit above each color blocking block.

[0068] Continue reading Figure 7 After forming the light blocking structure 31, a quantum dot ink layer can be formed on the red color block 121, the green color block 122 and the blue color block 123 by inkjet printing process, and then dried and cured, thereby completing the preparation of the red conversion unit 321, the green conversion unit 322 and the blue conversion unit 323. Among them, since the red conversion unit 321 and the green conversion unit 322 are quantum dot inks, they can have good wetting properties with the light blocking structure 31, and during preparation, the thickness of the central area of ​​the red conversion unit 321 and the green conversion unit 322 can be made not less than 8 microns, thereby improving the uniformity of light output.

[0069] In another optional implementation, Figure 8 A schematic flow chart of a second method for preparing a color conversion layer provided in an embodiment of the present application, Fig. 9 for Figure 8 The structural diagram of the corresponding color conversion layer. Among them, step S131 and step S132 can refer to the above description, and will not be repeated below.

[0070] Step S133: forming a reflective layer on the surface of the light blocking structure.

[0071] See also Fig. 9 A physical vapor deposition process can be used to deposit a reflective material layer on the light blocking structure 31 and the color block 12 and then a photoresist can be coated. A mask can then be used to expose and develop the photoresist to remove the photoresist above the color block 12 and expose the reflective material layer. A wet etching process can then be used to etch away the exposed reflective material layer, thereby forming a reflective layer 33.

[0072] Step S134: forming a blue light protection layer on each green color resist block.

[0073] A chemical vapor deposition process is used to deposit an anti-blue light material layer on the color block 12 and the reflective layer 33, and a photoresist is coated on the anti-blue light material layer. Afterwards, a mask plate can be used for exposure and development, and only the photoresist on the green color block 122 is retained, and the anti-blue light material layer in other areas is exposed. Afterwards, the exposed anti-blue light material layer is etched by dry etching, so as to form an anti-blue light layer 35 on the green color block 122.

[0074] Step S135 , forming a scattering layer on the blue light protection layer, the side wall of the reflective layer, the red color resist block, and the blue color resist block.

[0075] A scattering material layer may be deposited by chemical vapor deposition on the sidewalls of the blue light blocking layer 35, the reflective layer 33, the red color block 121, and the blue color block 123. A photoresist is then coated on the scattering material layer, and then exposure and development are performed to remove the photoresist in the corresponding areas above the blue light blocking layer 35, the upper end surface of the light blocking structure 31, the red color block 121, and the blue color block 123, exposing the scattering material layer, and then dry etching may be performed to remove the exposed scattering material layer and expose the reflective layer 33.

[0076] Step S140 , aligning the color conversion layer and the array substrate so that the color conversion unit and the blue light emitting unit are arranged correspondingly.

[0077] See also Figure 1 , the color conversion layer is aligned and inverted on the array substrate, so that the color conversion unit 32 can be arranged corresponding to the blue light-emitting unit 23, and the color film substrate and the array substrate are fixed by a frame glue (not shown). Compared with forming the color conversion unit directly on the array backplane, the process of inverting the color conversion layer and aligning it with the array backplane in the embodiment of the present application is simpler and less costly. In addition, forming the light blocking structure 31 on the color film substrate can also facilitate the formation of a reflective layer 33 and a scattering layer 34 on the surface of the light blocking structure 31, and because the lower end surface of the light blocking structure 31 abuts against the array substrate after the color conversion layer is inverted, the light passing through the light blocking structure 31 can be minimized.

[0078] Taking the case where the color conversion layer includes the reflective layer 33 as an example, after step S140, the method may further include:

[0079] Step S150: forming a heat-conducting layer on the lower surface of the array substrate, and connecting the reflective layer and the heat-conducting layer through through holes opened on the array substrate.

[0080] A heat-conducting layer 24 is formed on the lower surface of the array substrate by a physical vapor deposition process. The heat-conducting layer 24 is connected to the exposed reflective layer 33 through a through hole 25 opened on the array substrate. Figure 1 and Figure 2 .

[0081] Since the display device prepared by the method for preparing the display device in this embodiment has all the technical features and technical effects of the above-mentioned display device embodiments, specific reference is made to the above-mentioned embodiments and no further details are given here.

[0082] The naming or numbering of the steps in this application does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The named or numbered process steps can change the execution order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0083] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] It should be understood that in the description of the present application specification and the appended claims, the terms "include", "comprises", "has" and any variations thereof are intended to cover non-exclusive inclusions and mean "including but not limited to", unless otherwise specifically emphasized.

[0085] In the description of this application, unless otherwise specified, " / " indicates that the objects associated with each other are in an "or" relationship. For example, A / B can represent A or B. "And / or" in this application is used to describe the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0086] Furthermore, in the description of the present application, unless otherwise specified, "plurality" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items.

[0087] In addition, in the description of the present application, it should be understood that the terms "longitudinal", "horizontal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0088] In the present application, unless otherwise clearly specified and limited, the terms "connection", "connected", etc. should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0089] In addition, in the description of the present specification and the appended claims, the terms "first", "second", etc. are used to distinguish similar objects, but not necessarily to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein; the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0090] In the embodiments of the present application, the words "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0091] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, characterized in that: include: A color filter substrate, an array substrate, and a color conversion layer sandwiched between the color filter substrate and the array substrate. The color filter substrate comprises a base substrate, color blocks of multiple colors formed on the base substrate, and a black matrix located between adjacent color blocks; the multiple colors include red, green and blue; A plurality of blue light-emitting units arranged in an array are formed on the array substrate, and the blue light-emitting units correspond to the color-resistance blocks one by one; The color conversion layer includes a light-blocking structure formed between the lower surface of the black matrix and the array substrate for isolating each of the blue light-emitting units, and a color conversion unit located between each of the color resist blocks and the corresponding blue light-emitting units, each of the color conversion units being used to convert the light emitted by the corresponding blue light-emitting unit into light of the same color as the color resist block above it.

2. The display device according to claim 1, characterized in that The surface of the light blocking structure is covered with a reflective layer.

3. The display device according to claim 2, characterized in that: A heat-conducting layer is disposed on the lower surface of the array substrate, and the reflective layer is connected to the heat-conducting layer through a through hole opened on the array substrate.

4. The display device according to claim 2, characterized in that: A scattering layer is formed between the color conversion unit and the color resist block and on a side wall of the reflective layer.

5. The display device according to claim 4, characterized in that: An anti-blue light layer is also arranged between the green color-resistance block and the corresponding color conversion unit.

6. The display device according to claim 5, characterized in that: The material of the scattering layer is titanium dioxide, and the material of the anti-blue light layer includes one or more of silicon dioxide, titanium dioxide and magnesium oxide.

7. The display device according to claim 1, characterized in that The color conversion units corresponding to the red color block and the green color block are both prepared using CdSe / ZnS quantum dots with a core-shell structure. The quantum dot diameter of the color conversion unit corresponding to the red color block is smaller than that of the color conversion unit corresponding to the green color block; the color conversion unit corresponding to the blue color block includes titanium dioxide and acrylic resin.

8. The display device according to any one of claims 1 to 7, characterized in that: The light-blocking structure is made of photoresist material, the height of the light-blocking structure is not less than 20 micrometers, and the thickness of the color conversion unit is not less than 8 micrometers.

9. A method for preparing a display device, characterized in that: include: Forming color blocks of multiple colors and a black matrix between adjacent color blocks on a base substrate; The plurality of colors includes red, green and blue; forming a blue light-emitting unit on the array substrate; the blue light-emitting unit corresponds to the color-resistance block one by one; A color conversion layer is formed on the black matrix and the color resist blocks; the color conversion layer includes a light blocking structure formed on the upper surface of the black matrix, and a color conversion unit located above each of the color resist blocks; The color conversion layer is aligned with the array substrate so that the color conversion units are arranged correspondingly to the blue light-emitting units; each color conversion unit is used to convert the light emitted by the corresponding blue light-emitting unit into light of the same color as the color block above it.

10. The method according to claim 9, characterized in that The step of forming a color conversion layer on the black matrix and the color resist block comprises: forming the light blocking structure above the black matrix; forming a reflective layer on the surface of the light blocking structure; A blue light protection layer is formed on the green color block; Forming a scattering layer on the blue light protection layer, the side wall of the reflective layer, the red color block and the blue color block; A color conversion unit is formed above each color block.

Images