Color conversion layer preparation method and display device

Abstract

The application relates to a color conversion layer preparation method and a display device, and relates to the technical field of laser printing, and is used for relieving the problem that the color conversion layer manufacturing method adopting an inkjet printing method and a photoresist process is relatively complicated and causes relatively high film manufacturing difficulty. The method comprises the following steps: performing at least one laser radiation process on powder laid on a substrate to form a color conversion layer on the substrate; wherein each laser radiation process performs the following steps: laying the powder on the substrate, wherein the powder is a polymer doped with quantum dots or fluorescent powder; radiating the powder laid on the substrate by using a laser according to the positions of preset pixel points to melt the powder at the radiation positions; and removing the powder not radiated by the laser on the substrate. Since the embodiment of the application radiates the powder by using a laser, the polymer is melted to melt the powder at the positions of the preset pixel points, so that the color conversion layer is formed, and the manufacturing steps of manufacturing the color conversion layer are simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser printing, and in particular to a color conversion layer preparation method and a display device. BACKGROUND

[0002] In the process of making a color conversion layer, the commonly used methods can be inkjet printing and photoresist technology. Among them, the inkjet printing method mainly includes wet printing and dry printing. For example, in the process of wet inkjet printing, that is, the inkjet printing preparation process using the solution method, first, ink containing quantum dots can be prepared, and at the same time, a black matrix (BM) must be provided to define the position of the printed pixel droplets to prevent quantum dot pixels from crosstalk between different pixels. Then, the quantum dot ink is inkjet printed into the pixel pits of the BM, and then UV curing or heating curing is required to solidify the ink.

[0003] The photoresist technology mainly includes the following steps: first, dispersing fluorescent powder / quantum dots in photoresist and coating on a substrate, then soft baking to fix the photoresist doped with fluorescent powder / quantum dots on the substrate, exposing through a mask, removing the unnecessary photoresist through development to obtain the required pixel pattern, and finally heating to perform a bake process to completely solidify the prepared pixel pattern on the glass substrate. The process of making a color conversion layer using photoresist technology is relatively complex.

[0004] In summary, the existing inkjet printing and photoetching methods for making a color conversion layer are relatively cumbersome and complex. SUMMARY

[0005] The present application provides a color conversion layer preparation method and a display device to alleviate the problem of complex process of making a color conversion layer caused by the relatively cumbersome methods of inkjet printing and photoresist technology.

[0006] The color conversion layer preparation method provided by the embodiments of the present application comprises the following steps:

[0007] performing at least one laser irradiation process on the powder laid on the substrate to form a color conversion layer on the substrate;

[0008] In each laser irradiation process, the following steps are performed:

[0009] laying the powder on the substrate, wherein the powder is a polymer doped with quantum dots and / or fluorescent powder;

[0010] irradiating the powder laid on the substrate with laser according to the positions of the preset pixel points to melt the powder at the positions;

[0011] cleaning the powder not irradiated by the laser on the substrate.

[0012] The method can heat the pixel points by laser irradiation, the polymer is heated and melted, and the powder doped with quantum dots and / or fluorescent powder is solidified at the preset pixel points after the heating and melting, so that the two steps of printing and solidifying are simplified into one step, and the pixel points are fixed on the substrate by the two steps of printing and solidifying mentioned in the prior art, so that the process of manufacturing the color conversion layer is simplified.

[0013] In a possible implementation, the powder used to form different color conversion layers contains different quantum dots and / or different contents of fluorescent powder.

[0014] The different quantum dots include different contents of quantum dots and / or different particle sizes of quantum dots.

[0015] The different color conversion layers convert light into different colors.

[0016] The method can meet the requirement of converting different colors by the color conversion layer by using the powder containing different quantum dots and / or different contents of fluorescent powder.

[0017] In a possible implementation, the different color conversion layers have different preset pixel point positions.

[0018] The method can manufacture the color conversion layer capable of forming different colors by using the different preset pixel point positions, that is, different irradiations are performed on different colors, and the powder at the position is fixed after each irradiation, so that the color deviation during manufacturing of different colors is avoided.

[0019] In a possible implementation, the method further includes:

[0020] determining the number N of irradiations by using the powder used to form the color conversion layer according to the thickness of the color conversion layer, and performing the laser irradiation process for forming the color conversion layer N times.

[0021] In each laser irradiation process for forming the color conversion layer, the preset pixel point position is the same.

[0022] The method can increase the thickness of the color conversion layer by the number of irradiations, and reduce the process difficulty of increasing the thickness of the color conversion layer.

[0023] In a possible implementation, if the laser irradiation process is performed twice, the powder used to form the color conversion layer contains different quantum dots and / or different contents of fluorescent powder.

[0024] The red quantum dots doped in the powder used in the first laser irradiation process have a particle size of 7–20 nanometers, and the green quantum dots doped in the powder used in the second laser irradiation process have a particle size of 4–15 nanometers; or, the green quantum dots doped in the powder used in the first laser irradiation process have a particle size of 4–15 nanometers, and the red quantum dots doped in the powder used in the second laser irradiation process have a particle size of 7–20 nanometers; or

[0025] The powder used in the first laser irradiation process is doped with red phosphor, and the powder used in the second laser irradiation process is doped with green phosphor, or the powder used in the first laser irradiation process is doped with green phosphor, and the powder used in the second laser irradiation process is doped with red phosphor.

[0026] In the above method, during the two laser irradiation processes, the red quantum dots doped in the powder used in the first laser irradiation process have a particle size of 7–20 nanometers, and the green quantum dots doped in the powder used in the second laser irradiation process have a particle size of 4–15 nanometers; or, the green quantum dots doped in the powder used in the first laser irradiation process have a particle size of 4–15 nanometers, and the red quantum dots doped in the powder used in the second laser irradiation process have a particle size of 7–20 nanometers, forming a color conversion layer capable of switching between red and green, thus simplifying the manufacturing process of a three-color display screen. Alternatively, red phosphor doped in the powder used in the first laser irradiation process and green phosphor doped in the powder used in the second laser irradiation process can be used, or, the green phosphor doped in the powder used in the first laser irradiation process and red phosphor doped in the powder used in the second laser irradiation process can be used to form a color conversion layer capable of switching between red and green, further simplifying the manufacturing process of a three-color display screen.

[0027] In one possible implementation, the powder is spread onto a substrate, comprising:

[0028] The powder is spread on the substrate and then leveled using a scraper.

[0029] The above method, which involves sprinkling powder onto a substrate and using a scraper to spread the powder evenly, can avoid the problem of uneven thickness of the color conversion layer after laser irradiation.

[0030] In one possible implementation, the powder comprises: a polymer and quantum dots, wherein the quantum dots have a mass fraction of 15% to 60% in the powder; or

[0031] The powder comprises a polymer and a phosphor, wherein the phosphor has a mass fraction of 15% to 60% in the powder; or

[0032] The powder comprises a polymer, quantum dots, and fluorescent powder, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%.

[0033] The method can comprise a polymer and quantum dots in the powder, the mass fraction of the quantum dots in the powder is 15% to 60%, the quantum dots are used as the light-emitting material, and the polymer is used as the base material, or the powder comprises a polymer and fluorescent powder, the mass fraction of the fluorescent powder in the powder is 15% to 60%, the fluorescent powder is used as the light-emitting material, and the polymer is used as the base material, or the polymer is used as the base material, and the quantum dots and the fluorescent powder are used as the light-emitting material, and the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%. The polymer can cause the polymer to have a melting effect when the laser is radiated, the quantum dots can be melted at the position of the preset pixel point, so that a color conversion layer is formed, and the powder that is melted is naturally solidified. Compared with the color conversion layer prepared by the inkjet printing method and the photoresist process in the prior art, the process of solidification is reduced, so that the preparation process is relatively simple.

[0034] In a possible implementation, the polymer is nylon, or polyethylene terephthalate, or polymethyl methacrylate.

[0035] The method uses the commonly used optical resin materials such as nylon, or polyethylene terephthalate, or polymethyl methacrylate as the base material, and the efficiency of the melting effect of the polymer can be improved.

[0036] In a possible implementation, when the powder comprises a polymer and quantum dots, the mass fraction of the quantum dots in the powder is 20% to 40%; or

[0037] When the powder comprises a polymer and fluorescent powder, the mass fraction of the fluorescent powder in the powder is 20% to 40%; or

[0038] When the powder comprises a polymer, quantum dots, and fluorescent powder, the mass fraction of the quantum dots and the fluorescent powder in the powder is 20% to 40%.

[0039] The method can make the quantum dots and / or the fluorescent powder better combine with the polymer to form the powder, and when the laser irradiates the powder at the position of the preset pixel point, the powder can be more tightly fused on the substrate.

[0040] In a possible implementation, the particle size of the powder is 1-50 microns.

[0041] The method can make the quantum dots and / or the fluorescent powder better combine with the polymer to form the powder, and when the laser irradiates the powder at the position of the preset pixel point, the powder can be more tightly fused on the substrate.

[0042] In a possible implementation, the particle size of the powder is 3-15 microns.

[0043] The method can make the quantum dots and / or the fluorescent powder better combine with the polymer to form the powder, and when the laser irradiates the powder at the position of the preset pixel point, the powder can be more tightly fused on the substrate.

[0044] In a possible implementation, the powder is prepared by the following method, comprising:

[0045] The quantum dots or the fluorescent powder are dispersed in the polymer to obtain a polymer solution;

[0046] The polymer solution is prepared into the powder doped with the quantum dots or the fluorescent powder by using a closed cavity low-pressure powder spraying atomization method.

[0047] The method can make the quantum dots and / or the fluorescent powder better combine with the polymer to form the powder, and when the laser irradiates the powder at the position of the preset pixel point, the powder can be more tightly fused on the substrate.

[0048] In a second aspect, the application further provides a display device, comprising:

[0049] A backlight assembly is configured to generate backlight.

[0050] a color conversion layer on the light exit side of the backlight assembly for color conversion of the backlight, the color conversion layer being prepared by the preparation method of any one of the above embodiments.

[0051] It should be understood that the general description above and the detailed description below are only exemplary and explanatory, and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application, and, without in any way limiting the present application, illustrate embodiments consistent with the present application.

[0053] Figure 1 is a schematic diagram of a wet inkjet printing forming a color conversion layer;

[0054] Figure 2 is a flowchart of a color conversion layer preparation method of the present application embodiment of a laser irradiation process;

[0055] Figure 3 is a flowchart of a color conversion layer preparation method of the present application embodiment of a laser irradiation process;

[0056] Figure 4 is a flowchart of a color conversion layer preparation method of the present application embodiment of a laser irradiation process;

[0057] Figure 5A is a schematic diagram of a powder laid on a substrate of the present application embodiment;

[0058] Figure 5B is a schematic diagram of a powder laid on a substrate of the present application embodiment;

[0059] Figure 5C is a schematic diagram of a powder laid on a substrate of the present application embodiment;

[0060] Figure 5D is a schematic diagram of a powder laid on a substrate of the present application embodiment;

[0061] Figure 5E is a schematic diagram of a powder laid on a substrate of the present application embodiment;

[0062] Figure 5F is a schematic diagram of a powder laid on a substrate of the present application embodiment;

[0063] Figure 5Gis a schematic diagram of powder laid on a substrate that has been irradiated by laser according to an embodiment of the present application;

[0064] Figure 5H is a schematic diagram of powder laid on a substrate that has been irradiated by laser according to an embodiment of the present application;

[0065] Figure 5I is a schematic diagram of powder laid on a substrate that has been irradiated by laser according to an embodiment of the present application;

[0066] Figure 6 is a schematic diagram of a color conversion layer formed by laser irradiation twice according to an embodiment of the present application;

[0067] Figure 7 is a flow chart of a method for preparing a color conversion layer by laser irradiation multiple times according to an embodiment of the present application;

[0068] Figure 8 is a flow chart of a method for preparing a powder doped with quantum dots according to an embodiment of the present application;

[0069] Figure 9 is a flow chart of a method for preparing a powder doped with fluorescent powder according to an embodiment of the present application;

[0070] Figure 10 is a flow chart of a method for preparing a powder doped with quantum dots and fluorescent powder according to an embodiment of the present application;

[0071] Figure 11 is a schematic diagram of an apparatus corresponding to a method for preparing a powder according to an embodiment of the present application;

[0072] Figure 12 is a flow chart of a method for preparing a powder doped with quantum dots using a nylon solution according to an embodiment of the present application;

[0073] Figure 13 is a flow chart of a method for preparing a powder doped with fluorescent powder using a nylon solution according to an embodiment of the present application;

[0074] Figure 14 is a flow chart of a method for preparing a powder doped with quantum dots and fluorescent powder using a nylon solution according to an embodiment of the present application;

[0075] Figure 15 is a flow chart of a method for preparing a powder doped with quantum dots using a PET solution according to an embodiment of the present application;

[0076] Figure 16 is a flow chart of a method for preparing a powder doped with fluorescent powder using a PET solution according to an embodiment of the present application;

[0077] Figure 17 is a flow chart of a powder preparation method doped with quantum dots and fluorescent powder prepared by using a PET solution according to an embodiment of the present application;

[0078] Figure 18 is a flow chart of a powder preparation method doped with quantum dots prepared by using a PMMA solution according to an embodiment of the present application;

[0079] Figure 19 is a flow chart of a powder preparation method doped with fluorescent powder prepared by using a PMMA solution according to an embodiment of the present application;

[0080] Figure 20 is a flow chart of a powder preparation method doped with quantum dots and fluorescent powder prepared by using a PMMA solution according to an embodiment of the present application;

[0081] Figure 21 is a structural diagram of a display device according to an embodiment of the present application;

[0082] Figure 22 is a structural diagram of another display device according to an embodiment of the present application. DETAILED DESCRIPTION

[0083] In order to make the ordinary person skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings.

[0084] It should be noted that the terms "first", "second" and the like in the description, claims and above drawings of the present application are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0085] The application scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that with the emergence of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems. In the description of the present application, the meaning of "a plurality of" is not specified.

[0086] Currently, the wet inkjet printing method needs to first make quantum dot ink 14, then make black matrix (BM) 11, combine Figure 1 As shown in the figure, the BM 11 is placed on the substrate 12, the quantum dot ink 14 is printed on the BM 11 by using the nozzle 13, and since the quantum dot ink 14 is a solution, solidification needs to be performed, and the color conversion layer with the BM 11 is solidified. In the process of quantum dot inkjet printing, due to the difference in size between the quantum dots and the dispersed particles, the quantum dot particle size is generally less than 30 nanometers, and the dispersed particle size can be 50 nanometers to 5000 nanometers, so it may cause uneven dispersion of quantum dots and dispersed particles in the ink, resulting in clogging of the printing nozzle, or it may cause the quantum dots and dispersed particles to separate under high temperature for a long time. Therefore, in the process of wet inkjet printing, when the manufacturing process is complex, the problem of easy clogging of the printing nozzle also exists.

[0087] The process of dry preparation of the color conversion layer is to make a material doped with quantum dots, then form a dry powder of the quantum dot doped ink, and spray the quantum dot doped material onto the substrate by airflow. In the process of airflow printing, the airflow is blocked at different positions on the surface of the substrate, and as the printing proceeds, the material just deposited at the top of the airflow changes the shape encountered by the airflow, resulting in uneven thickness of the quantum dot doped material sprayed on the substrate.

[0088] The photoresist process mainly disperses fluorescent powder in photoresist for coating, and then performs photoetching through a mask, and then develops, however, when the photoresist process is used for preparation, the material utilization rate is very low, and at the same time, the color conversion layer film forming rate is not high due to the defects of the mask quality.

[0089] As can be seen from the above, the existing color conversion layer preparation method not only has a complex process, but also has a low color conversion layer film forming rate due to the auxiliary tools such as the mask in the preparation process.

[0090] The embodiment of the present application provides a color conversion layer preparation method, which can be used to lay a polymer doped with quantum dots or fluorescent powder on a substrate, and then irradiate the polymer doped with quantum dots or fluorescent powder at a predetermined pixel position by using a laser, so that the polymer doped with quantum dots or fluorescent powder at the position is melted to obtain a pixel at the position, which can alleviate the problem of high difficulty in preparing the color conversion layer caused by the complex process of the inkjet printing method and the photoresist process.

[0091] In view of the above scenario, the embodiments of the present application will be further described in detail in combination with the drawings of the specification.

[0092] The method for preparing the color conversion layer comprises the following steps:

[0093] performing at least one laser irradiation process on the powder on the substrate to form the color conversion layer on the substrate;

[0094] wherein each laser irradiation process comprises the following steps: Figure 2 as shown,

[0095] Step S201: spreading the powder on the substrate, wherein the powder is a polymer doped with quantum dots or fluorescent powder;

[0096] Step S202: irradiating the powder on the substrate with laser according to the positions of the preset pixel points to melt the powder at the positions;

[0097] Step S203: removing the powder on the substrate that is not irradiated by the laser.

[0098] In the above method, since the powder is a polymer doped with quantum dots or fluorescent powder, when the polymer is irradiated by laser according to the positions of the preset pixel points, the polymer undergoes a melting effect under the laser, the powder at the positions can be heated to the melting point and fused together, and the quantum dots are also melted on the substrate. After the powder at the positions is irradiated by the laser, the quantum dots and / or the fluorescent powder can be solidified on the substrate without special solidification process. The color conversion layer is formed by laser irradiation, which simplifies the process of preparing the color conversion layer, and does not use the above-mentioned quantum dot ink, so there is no problem of uneven dispersion of quantum dots and dispersed particles in the ink causing blockage of the printing head, or the quantum dots and dispersed particles may be layered due to long storage at high temperature. In addition, there is no need to make a checkboard baffle and perform solidification, and the powder is used, so there is no problem of uneven thickness of the material doped with quantum dots on the substrate due to the blocking of airflow at different positions on the surface of the substrate during printing, and there is no problem of low film formation rate of the color conversion layer due to defects in the mask quality.

[0099] In step S202, the positions of the pixel points refer to the positions of the pixel points in the color conversion layer.

[0100] In addition, the photoresist removed by developing cannot be reused, so that the material utilization is very low, and the process using quantum dots / fluorescent powder is more unsuitable, and based on this, in the embodiment of the present application, the step of removing the powder not irradiated by the laser on the substrate can be removing the powder not irradiated by the laser on the substrate by using air flow.

[0101] It can be understood that, after the powder on the substrate is irradiated by the laser, the powder not irradiated by the laser still exists on the position not irradiated by the laser, so that air blowing can be performed on the substrate, and the powder not irradiated by the laser is in powder form, and in the process of air blowing on the substrate, the powder not irradiated by the laser is separated from the substrate, and the powder doped with quantum dots or fluorescent powder removed on the substrate is recycled, and then can be reused.

[0102] In the embodiment of the present application, the powder used to form different color conversion layers is different in quantum dots and / or different in content of fluorescent powder;

[0103] The different quantum dots include different content of quantum dots and / or different particle size of quantum dots;

[0104] The different color conversion layers convert light into different colors.

[0105] Specifically, for the color conversion layers converting different colors, the powder doped with quantum dots and / or fluorescent powder used is also different, wherein for the quantum dots, the factors for converting different colors can be content or particle size. The components of the quantum dots can include perovskite, cadmium selenide, indium phosphide, copper indium sulfide. For emitting different colors, the proportions of the components of the quantum dots are also different. For the same component, the particle size of the quantum dots formed also emits different colors. Therefore, the present application can consider the content and particle size of the quantum dots when the color conversion layers need to convert different colors, and the quantum dots are manufactured. At the same time, for the powder corresponding to the quantum dots emitting different colors, different radiation times are needed for radiation. For the powder doped with fluorescent powder, the fluorescent powder emitting different colors can be adjusted according to the components and proportions. For example, the fluorescent powder emitting red light can use KSF powder, and the fluorescent powder emitting green light can use GaYAG powder and YAG powder. The particle size of the fluorescent powder can be less than 15 microns. For the powder doped with quantum dots and fluorescent powder, the quantum dots and fluorescent powder emitting different colors can be adjusted according to the components and proportions of the quantum dots and fluorescent powder.

[0106] In the embodiment of the present application, the different color conversion layers are different in preset positions of pixel points.

[0107] In detail, for the color conversion layer converting different colors, the preset pixel point position corresponding to each color is different.

[0108] In the existing process of preparing the color conversion layer, the thickness of the color conversion layer prepared by inkjet printing is about 2 microns each time, for example, the thickness of the color conversion layer made of quantum dots or fluorescent powder mainly depends on the thickness of the BM, and the thickest BM that can be prepared at present is about 10 microns. For a thicker color conversion layer, the process is difficult to implement. Moreover, the thickness of the BM tends to be thinner. The preparation of a thicker BM will inevitably reduce the optical density (OD) value of the BM, resulting in insufficient display effect of blackness under a black background.

[0109] Therefore, in the embodiment of the present application, the number N of times of irradiation of the powder used to form the color conversion layer is determined according to the thickness of the color conversion layer, and the laser irradiation process for forming the color conversion layer is performed N times.

[0110] In each time of performing the laser irradiation process for forming the color conversion layer, the preset pixel point position is the same.

[0111] In detail, the present application can increase the thickness of the color conversion layer by the number of times of laser irradiation. It is known that the thickness of the color conversion layer formed by one time of laser irradiation, and the number N of times of irradiation of the powder used to form the color conversion layer can be determined according to the total thickness required by the color conversion layer divided by the thickness of the color conversion layer formed by one time of laser irradiation. Then, repeated irradiation is performed at the same pixel point position, that is, the thickness of the powder fused at this position is increased, that is, the thickness of the color conversion layer is increased. Therefore, compared with the prior art, the present application can form a color conversion layer with large thickness by repeatedly spreading powder at the same position and repeatedly irradiating, thereby reducing the process difficulty of manufacturing a color conversion layer with large thickness.

[0112] The following two examples will be used to specifically introduce the above functions. In the embodiment of the present application, when one time of laser irradiation is performed, the preparation of the color conversion layer is completed by one time of laser irradiation. In combination with Figure 3 As shown in the figure, the following steps are performed:

[0113] Step S301: Spread the powder used this time on the substrate, wherein the powder is a polymer doped with quantum dots or fluorescent powder;

[0114] Step S302: According to the preset pixel point position, the powder used this time spread on the substrate is irradiated by laser to fuse the powder used this time at the position to form the color conversion layer;

[0115] Step S303: Remove the powder used this time on the substrate which is not irradiated by laser.

[0116] In this embodiment of the invention, if a color conversion layer can be formed through two laser radiation processes, then it can be processed as follows: Figure 4 As shown in the diagram.

[0117] Step S401: Spread the powder used for the first time onto the substrate;

[0118] Step S402: According to the preset position of the first corresponding pixel, use a laser to irradiate the powder laid on the substrate to melt the powder at the position.

[0119] Step S403: Remove the first-time-used powder from the substrate that was not irradiated by the laser.

[0120] Step S404: Spread the second-use powder onto the substrate;

[0121] Step S405: According to the preset position of the second corresponding pixel, use a laser to irradiate the powder laid on the substrate to melt the powder at the position.

[0122] Step S406: Remove the second-use powder that was not irradiated by the laser on the substrate.

[0123] When the powder corresponding to two laser irradiations is different, different color conversion layers can be formed, combined with... Figure 6 The diagram shows the results of two laser irradiations. The color conversion layer formed by the two laser irradiations has a pixel size of 5*6, with 5 pixels in each horizontal direction and 6 pixels in each vertical direction. There are two different types of multiple pixels. The first type of pixel is a box formed by diagonally upward horizontal lines, which corresponds to the pixel formed by the powder used in the first application. Each laser irradiation forms 18 identical first pixels. The second type of pixel is a box formed by dots, which corresponds to the pixel formed by the powder used in the second application. Each laser irradiation forms 12 identical second pixels.

[0124] Figure 6 The first application of powder corresponds to the formed pixels. The preset positions of the first corresponding pixels are the first three positions from left to right in the first, third, and fifth rows, and the last three positions in the second, fourth, and sixth rows. Figure 6 The second use of powder corresponds to the pixel points formed. The preset positions of the second corresponding pixel points are the second row, the fourth row, and the sixth row, the first two positions from left to right, the first row, the third row, and the fifth row, and the last two positions.

[0125] As an example, the first time used powder is powder 52, and the second time used powder is powder 53. In combination with Figure 5A As shown, the first time used powder 52 is first laid on the substrate 51, in combination with Figure 5B As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 6 the first three positions from left to right in the first row, the third row, and the fifth row, and the last three positions in the second row, the fourth row, and the sixth row, the powder is melted at the positions of the three pixel points from left to right, Figure 5B As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 5B As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 6 As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 5C As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form

[0126] As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 5D As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 6 As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 5E As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 5F As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form Figure 6 As shown, the pixel points corresponding to the first time are preset, that is, in the first row, the third row, and the fifth row, the first three positions from left to right, and in the second row, the fourth row, and the sixth row, the last three positions, the laser emitted by the laser emitting device 54 is used to irradiate the first time used powder 52 laid on the substrate 51, melt the polymer at the positions of the pixel points corresponding to this time, and form

[0127] In actual application process, when manufacturing the display, the color conversion layer manufactured usually needs to convert red, green and blue light, and usually blue laser can be used for irradiation, so only two times of irradiation are needed when forming the color conversion layer, in the embodiment of the present application, if two times of laser irradiation process are performed, then:

[0128] The particle size of the red quantum dots doped in the powder used in the first laser irradiation process is 7-20 nanometers, and the particle size of the green quantum dots doped in the powder used in the second laser irradiation process is 4-15 nanometers, or the particle size of the green quantum dots doped in the powder used in the first laser irradiation process is 4-15 nanometers, and the particle size of the red quantum dots doped in the powder used in the second laser irradiation process is 7-20 nanometers; or

[0129] The red fluorescent powder doped in the powder used in the first laser irradiation process, and the green fluorescent powder doped in the powder used in the second laser irradiation process, or the green fluorescent powder doped in the powder used in the first laser irradiation process, and the red fluorescent powder doped in the powder used in the second laser irradiation process.

[0130] In the process of thickening the color conversion layer, the above-mentioned two times of irradiation can also be two times of irradiation on the same pixel point position. Taking the irradiated powder 52 as an example, combining FIG. 4A, the first irradiation is performed, the powder 52 is irradiated by laser, and the pixel points corresponding to the powder 52 at the preset positions are formed. Combining FIG. 4B, the powder 52 is laid on the substrate with the first irradiation, and combining FIG. 4C, in the second irradiation process, the powder is laid on the irradiated position to be irradiated, so as to increase the thickness of the pixel points at the above-mentioned positions, that is, to increase the thickness of the color conversion layer. Combining FIG. 4D, the powder 52 not irradiated by laser is removed. Figure 5A - Figure 5C Figure 5G Figure 5H Figure 5I

[0131] In the multiple laser irradiation process, the steps shown in FIG. 5 can be performed, combining FIG. 6. Figure 7 Figure 7

[0132] Step S701: laying the powder used this time on the substrate.

[0133] Step S702: irradiating the powder laid on the substrate by laser according to the preset position of the pixel points corresponding to this time, so as to melt the powder at the position.

[0134] Step S703: removing the powder not irradiated by laser on the substrate.

[0135] ​​​​​​Step S704: judging whether the radiation times reach the set times; if yes, executing step S705, if no, executing step S701.

[0136] Step S705: stopping the radiation.

[0137] Since the powder is scattered on the substrate, the thickness of the powder on the substrate may be different when scattering, in the embodiment of the present application, the powder is laid on the substrate, comprising:

[0138] The powder is scattered on the substrate, and the powder on the substrate is laid flat by using a scraper.

[0139] In this way, the present application scatters the powder on the substrate, and then uses a scraper to scrape the powder flat, so that the problem of different thicknesses of the color conversion layer can be avoided.

[0140] The powder in the color film layer preparation method in the above embodiment, and the manufacturing method of the powder are introduced below.

[0141] The powder provided by the embodiment of the present application comprises: a polymer and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15% to 60%; or

[0142] The powder comprises a polymer and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15% to 60%; or

[0143] The powder comprises a polymer, quantum dots and fluorescent powder, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%.

[0144] The low-pressure atomized powder preparation method of the powder doped with quantum dots in the embodiment of the present application, in combination with Figure 8 As shown in the figure, comprising the following steps:

[0145] Step S801: dispersing quantum dots into a polymer to obtain a polymer solution;

[0146] Step S802: using a closed cavity low-pressure powder spraying atomization method to prepare the polymer solution into a powder doped with quantum dots, wherein the mass fraction of the quantum dots in the powder is 15% to 60%.

[0147] In combination with Figure 11 As shown in the figure, the device 1101 containing the polymer solution is connected with the low-vacuum powder preparation device 1102, the particles of the quantum dots are added into the solution of the polymer to obtain a polymer solution doped with quantum dots, and then the low-vacuum powder preparation device 1102 can be used to prepare the polymer solution into a powder doped with quantum dots by using a closed cavity low-pressure powder spraying atomization method.

[0148] Alternatively, the preparation method of the phosphor-doped embodiment of the present application, in combination with Figure 9 as shown, includes the following steps:

[0149] Step S901: dispersing the phosphor into the polymer to obtain a polymer solution;

[0150] Step S902: using the closed cavity low-pressure powder spraying atomization method to prepare the polymer solution into a phosphor-doped powder, wherein the mass fraction of the phosphor in the powder is 15% to 60%.

[0151] Similarly, in combination with Figure 11 as shown, the phosphor can be added to the device 1101 containing the polymer solution to obtain a phosphor-doped polymer solution, and then the low-vacuum powder preparation equipment 1102 can be used to use the closed cavity low-pressure powder spraying atomization method to prepare the polymer solution into a phosphor-doped powder.

[0152] Alternatively, the preparation method of the quantum dot and phosphor-doped embodiment of the present application, in combination with Figure 10 as shown, includes the following steps:

[0153] Step S1001: dispersing the quantum dots and the phosphor into the polymer to obtain a polymer solution;

[0154] Step S1002: using the closed cavity low-pressure powder spraying atomization method to prepare the polymer solution into a quantum dot and phosphor-doped powder, wherein the mass fraction of the quantum dots and the phosphor in the powder is 15% to 60%.

[0155] Among them, the embodiment of the present application also provides a powder, which includes: nylon and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15% to 60%, or

[0156] The powder includes: nylon and phosphor, wherein the mass fraction of the phosphor in the powder is 15% to 60%, or

[0157] The powder includes: nylon, quantum dots and phosphor, wherein the mass fraction of the quantum dots and the phosphor in the powder is 15% to 60%.

[0158] Among them, the preparation method of the quantum dot-doped powder of the embodiment of the present application, in combination with Figure 12 as shown, includes the following steps:

[0159] Step S1201: dispersing the quantum dots into the nylon solution to obtain a quantum dot-doped nylon solution;

[0160] Step S1202: The nylon solution doped with quantum dots is prepared into a powder doped with quantum dots by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the quantum dots in the powder is 15% to 60%.

[0161] Alternatively, the preparation method of the powder doped with fluorescent powder in the embodiment of the present application is combined with Figure 13 as shown, and includes the following steps:

[0162] Step S1301: The fluorescent powder is dispersed into a nylon solution to obtain a nylon solution doped with fluorescent powder;

[0163] Step S1302: The nylon solution doped with fluorescent powder is prepared into a powder doped with fluorescent powder by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the fluorescent powder in the powder is 15% to 60%.

[0164] Alternatively, the preparation method of the powder doped with quantum dots and fluorescent powder in the embodiment of the present application is combined with Figure 14 as shown, and includes the following steps:

[0165] Step S1401: The quantum dots and the fluorescent powder are dispersed into a nylon solution to obtain a nylon solution doped with quantum dots and fluorescent powder;

[0166] Step S1402: The nylon solution doped with quantum dots and fluorescent powder is prepared into a powder doped with quantum dots and fluorescent powder by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%.

[0167] The powder includes: PET and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15% to 60%, or

[0168] The powder includes: PET and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15% to 60%, or

[0169] The powder includes: PET, quantum dots and fluorescent powder, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%.

[0170] The preparation method of the powder doped with quantum dots in the embodiment of the present application is combined with Figure 15 as shown, and includes the following steps:

[0171] Step S1501: The quantum dots are dispersed into a PET solution to obtain a PET solution doped with quantum dots;

[0172] Step S1502: The PET solution doped with quantum dots is prepared into a powder doped with quantum dots by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the quantum dots in the powder is 15% to 60%.

[0173] Alternatively, the preparation method of the powder doped with fluorescent powder in the embodiment of the present application is combined with the preparation method of the powder doped with quantum dots in the embodiment of the present application, as shown in FIG. 6, and includes the following steps. Figure 16

[0174] Step S1601: The fluorescent powder is dispersed into a PET solution to obtain a PET solution doped with fluorescent powder;

[0175] Step S1602: The PET solution doped with fluorescent powder is prepared into a powder doped with fluorescent powder by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the fluorescent powder in the powder is 15% to 60%.

[0176] Alternatively, the preparation method of the powder doped with quantum dots and fluorescent powder in the embodiment of the present application is combined with the preparation method of the powder doped with quantum dots in the embodiment of the present application, as shown in FIG. 7, and includes the following steps. Figure 17

[0177] Step S1701: The quantum dots and the fluorescent powder are dispersed into a PET solution to obtain a PET solution doped with quantum dots and fluorescent powder;

[0178] Step S1702: The PET solution doped with quantum dots and fluorescent powder is prepared into a powder doped with quantum dots and fluorescent powder by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%.

[0179] The powder provided by the embodiment of the present application includes: polymethyl methacrylate (PMMA) and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15% to 60%, or

[0180] The powder includes: PMMA and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15% to 60%, or

[0181] The powder includes: PMMA, quantum dots and fluorescent powder, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%.

[0182] The preparation method of the powder doped with quantum dots in the embodiment of the present application is combined with the preparation method of the powder doped with quantum dots in the embodiment of the present application, as shown in FIG. 5, and includes the following steps. Figure 18

[0183] Step S1801: The quantum dots are dispersed into a PMMA solution to obtain a PMMA solution doped with quantum dots;

[0184] ​​​Step S1802: The PMMA solution doped with quantum dots is prepared into a powder doped with quantum dots by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the quantum dots in the powder is 15% to 60%.

[0185] Alternatively, the preparation method of the powder doped with fluorescent powder in the embodiment of the present application is combined with the preparation method of the powder doped with quantum dots in the embodiment of the present application. Figure 19 As shown in the figure, the method comprises the following steps:

[0186] Step S1901: The fluorescent powder is dispersed into the PMMA solution to obtain a PMMA solution doped with fluorescent powder.

[0187] Step S1902: The PMMA solution doped with fluorescent powder is prepared into a powder doped with fluorescent powder by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the fluorescent powder in the powder is 15% to 60%.

[0188] Alternatively, the preparation method of the powder doped with quantum dots and fluorescent powder in the embodiment of the present application is combined with the preparation method of the powder doped with quantum dots in the embodiment of the present application. Figure 20 As shown in the figure, the method comprises the following steps:

[0189] Step S2001: The quantum dots and the fluorescent powder are dispersed into the PMMA solution to obtain a PMMA solution doped with quantum dots and fluorescent powder.

[0190] Step S2002: The PMMA solution doped with quantum dots and fluorescent powder is prepared into a powder doped with quantum dots and fluorescent powder by using a closed cavity low-pressure powder spraying atomization method, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15% to 60%.

[0191] In the embodiment of the present application, the powder comprises a plurality of particles, each of which comprises quantum dots and a polymer, or each of which comprises fluorescent powder and a polymer, and the particle size of the particles in the powder is 1 to 50 microns.

[0192] In the embodiment of the present application, the particle size of the powder is 3 to 15 microns.

[0193] In addition, the average particle size of the particles in the powder can be 2 to 6 microns.

[0194] In the embodiment of the present application, when the powder comprises a polymer and quantum dots, the mass fraction of the quantum dots in the powder is 20% to 40%; or

[0195] When the powder comprises a polymer and fluorescent powder, the mass fraction of the fluorescent powder in the powder is 20% to 40%.

[0196] The embodiment of the present application also provides a display device, which comprises:

[0197] A backlight assembly for generating backlight;

[0198] A color conversion layer for color conversion of the backlight, which is located on the light exit side of the backlight assembly, is prepared by the preparation method of any of the above embodiments.

[0199] In practical application, the display device further comprises a circuit board, and the structure of the display device comprises the following two modes:

[0200] As shown in Figure 21 The circuit board is divided into a top plate 2130 and a bottom plate 2020, and the polarities of the top plate 2130 and the bottom plate 2020 are different, wherein the bottom plate 2120 is arranged on the side opposite to the light exit side of the backlight assembly 2110, and the color conversion layer 2140 and the top plate 2130 are arranged on the light exit side of the backlight assembly 2110.

[0201] As shown in Figure 22 The circuit board 2230 is arranged on the side opposite to the light exit side of the backlight assembly 2210, and the color conversion layer 2220 is arranged on the light exit side of the backlight assembly 2210.

[0202] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0203] It should be understood that the application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

Claims

1. A method for preparing a color conversion layer, characterized in that, include: When forming multiple color conversion layers, for each color conversion layer, the powder of the color conversion layer laid on the substrate is subjected to at least one laser irradiation process to form the color conversion layer on the substrate; wherein different color conversion layers are formed using different powders; and the preset pixel positions are different for different color conversion layers. Each laser radiation process includes the following steps: The powder is spread on a substrate, wherein the powder is a polymer doped with quantum dots and / or phosphors; According to the preset pixel position corresponding to the color conversion layer, a laser is used to irradiate the powder laid on the substrate to melt the powder at the specified position; Remove the powder particles on the substrate that were not irradiated by the laser; Specifically, for each color conversion layer, the number of times N is irradiated using the powder used to form the color conversion layer is determined based on the thickness of the color conversion layer, and the laser irradiation process for forming the color conversion layer is executed N times; in each execution of the laser irradiation process for forming the same color conversion layer, the preset pixel positions are the same.

2. The method for preparing the color conversion layer according to claim 1, characterized in that, The powders used to form different color conversion layers contain different quantum dots and / or different amounts or types of phosphors; The differences in quantum dots include differences in the content of quantum dots and / or differences in the particle size of quantum dots; The different color conversion layers convert light into different colors.

3. The method for preparing the color conversion layer according to claim 1, characterized in that, If two laser radiation processes are performed, then: The red quantum dots doped in the powder used in the first laser irradiation process have a particle size of 7-20 nanometers, and the green quantum dots doped in the powder used in the second laser irradiation process have a particle size of 4-15 nanometers, or the green quantum dots doped in the powder used in the first laser irradiation process have a particle size of 4-15 nanometers, and the red quantum dots doped in the powder used in the second laser irradiation process have a particle size of 7-20 nanometers. or The powder used in the first laser irradiation process is doped with red phosphor, and the powder used in the second laser irradiation process is doped with green phosphor, or the powder used in the first laser irradiation process is doped with green phosphor, and the powder used in the second laser irradiation process is doped with red phosphor.

4. The method for preparing the color conversion layer according to claim 1, characterized in that, Spreading the powder onto a substrate includes: The powder is spread on the substrate and then leveled using a scraper.

5. The method for preparing the color conversion layer according to claim 1, characterized in that, The powder comprises: a polymer and quantum dots, wherein the quantum dots constitute 15% to 60% by mass in the powder; or The powder comprises a polymer and a phosphor, wherein the phosphor has a mass fraction of 15% to 60% in the powder; or The powder comprises a polymer, quantum dots, and phosphors, wherein the mass fraction of the quantum dots and the phosphors in the powder is 15% to 60%.

6. The method for preparing the color conversion layer according to claim 1, characterized in that, The polymer is nylon, polyethylene terephthalate, or polymethyl methacrylate.

7. The method for preparing a color conversion layer according to claim 1, characterized in that, in, The particle size of the powder is 3-15 micrometers.

8. The method for preparing a color conversion layer according to claim 1, characterized in that, The powder is prepared by the following method, including: Quantum dots and / or phosphors are dispersed into a polymer to obtain a polymer solution; The polymer solution is prepared into a powder doped with quantum dots or phosphors by low-pressure spraying atomization in a closed cavity.

9. A display device, characterized in that, include: A backlight assembly for generating backlight; A color conversion layer is located on the light-emitting side of the backlight assembly and is used to convert the backlight color. The color conversion layer is prepared by the preparation method of any one of claims 1-8.

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