CN112768586A - Color conversion layer preparation method and display device - Google Patents
Color conversion layer preparation method and display device Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0008—Processes
- H01L2933/0033—Processes relating to semiconductor body packages
- H01L2933/0041—Processes relating to semiconductor body packages relating to wavelength conversion elements
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Abstract
The invention relates to a preparation method of a color conversion layer and a display device, relating to the technical field of laser printing and aiming at solving the problem of high difficulty in film preparation caused by more complicated methods for manufacturing the color conversion layer by adopting an ink-jet printing method and a photoresist process, wherein the method comprises the following steps: performing at least one laser irradiation process on the powder spread on the substrate to form a color conversion layer on the substrate; wherein the following steps are performed for each laser irradiation process: spreading powder on a substrate, wherein the powder is a polymer doped with quantum dots or fluorescent powder; according to the position of a preset pixel point, radiating the powder laid on the substrate by adopting laser to melt the powder at the radiation position; and removing powder which is not irradiated by the laser on the substrate. According to the embodiment of the invention, the laser is adopted to radiate the powder, so that the polymer generates a melting effect, and the powder is melted at the position of the preset pixel point, thereby forming the color conversion layer and simplifying the manufacturing steps of manufacturing the color conversion layer.
Description
Technical Field
The invention relates to the technical field of laser printing, in particular to a preparation method of a color conversion layer and a display device.
Background
In the fabrication of the color conversion layer, common methods can be an inkjet printing method and a photoresist process. Among them, the inkjet printing methods mainly include wet printing and dry printing. For example, in a wet inkjet printing process, i.e., an inkjet printing process using a solution method, an ink doped with quantum dots may be first prepared, and at the same time, a Black Bank (BM) is required to position the printed pixel droplets to prevent crosstalk between different pixel quantum dot pixels. The quantum dot ink is then ink-jet printed into the pixel pits of the BM and subsequently the ink needs to be cured by UV curing (ultraviolet curing) or heat curing.
The photoresist process mainly comprises the steps of firstly dispersing fluorescent powder/quantum dots in photoresist and coating the photoresist on a substrate, then carrying out soft baking, fixing the photoresist doped with the fluorescent powder/quantum dots on the substrate, carrying out exposure through a mask, removing the unnecessary photoresist through development to obtain a required pixel pattern, finally heating to carry out Bake process (baking process), completely curing the prepared pixel pattern on the glass substrate, and adopting the photoresist process to manufacture the color conversion layer, wherein the process is complex.
In summary, the conventional methods for fabricating color conversion layers by inkjet printing and photolithography are complicated and complicated in fabrication process.
Disclosure of Invention
The invention provides a preparation method of a color conversion layer and a display device, which are used for relieving the problem of complicated process for manufacturing the color conversion layer caused by the complicated method for manufacturing the color conversion layer by adopting an ink-jet printing method and a photoresist process.
The preparation method of the color conversion layer provided by the embodiment of the invention comprises the following steps:
performing at least one laser irradiation process on the powder spread on the substrate to form a color conversion layer on the substrate;
wherein each of the laser irradiation processes performs the steps of:
spreading the powder on a substrate, wherein the powder is a polymer doped with quantum dots and/or fluorescent powder;
according to the position of a preset pixel point, radiating powder laid on a substrate by adopting laser to melt the powder at the position;
and removing powder which is not irradiated by the laser on the substrate.
According to the method, the positions of the pixel points are heated through laser radiation, the polymer is heated and melted, and after the heating and melting are completed, the powder doped with the quantum dots and/or the fluorescent powder can be solidified at the positions of the preset pixel points.
In one possible implementation manner, the powders used for forming different color conversion layers contain different quantum dots and/or contain different content of fluorescent powder;
wherein the different quantum dots comprise different quantum dot contents and/or different quantum dot particle sizes;
the different color conversion layers convert light into different colors.
According to the method, the requirements of the color conversion layer for converting different colors can be met by the powder with different contained quantum dots and/or different contained fluorescent powder contents.
In a possible implementation manner, the positions of the preset pixels are different for different color conversion layers.
According to the method, the color conversion layers capable of forming different colors can be manufactured through different positions of the preset pixel points, namely different colors are irradiated for different times, and because each time of irradiation is local heating, the powder on the position is fixed after each time of irradiation is finished, so that the condition of color deviation during manufacturing of different colors is avoided.
In one possible implementation, the method further includes:
determining the number N of times of irradiation by using powder for forming the color conversion layer according to the thickness of the color conversion layer, and executing a laser irradiation process for forming the color conversion layer for N times;
and in the process of executing laser radiation for forming the color conversion layer each time, the positions of preset pixel points are the same.
The method can increase the thickness of the color conversion layer by the times of radiation, and reduces the process difficulty of increasing the thickness of the color conversion layer.
In one possible implementation, if two laser irradiation processes are performed, then:
the particle size of the red quantum dots doped in the powder used in the first laser radiation process is 7-20 nanometers, and the particle size of the green quantum dots doped in the powder used in the second laser radiation process is 4-15 nanometers, or the particle size of the green quantum dots doped in the powder used in the first laser radiation process is 4-15 nanometers, and the particle size of the red quantum dots doped in the powder used in the second laser radiation process is 7-20 nanometers; or
Red fluorescent powder doped in the powder used in the first laser radiation process, green fluorescent powder doped in the powder used in the second laser radiation process, or green fluorescent powder doped in the powder used in the first laser radiation process, and red fluorescent powder doped in the powder used in the second laser radiation process.
According to the method, in the two laser radiation processes, the grain diameter of the red quantum dots doped in the powder used in the first laser radiation process is 7-20 nanometers, the grain diameter of the green quantum dots doped in the powder used in the second laser radiation process is 4-15 nanometers, or the grain diameter of the green quantum dots doped in the powder used in the first laser radiation process is 4-15 nanometers, and the grain diameter of the red quantum dots doped in the powder used in the second laser radiation process is 7-20 nanometers, so that a color conversion layer capable of converting red or green is formed, and the manufacturing process of the three-color display screen is simplified. Or, the red fluorescent powder doped in the powder used in the first laser radiation process and the green fluorescent powder doped in the powder used in the second laser radiation process are adopted, or the green fluorescent powder doped in the powder used in the first laser radiation process and the red fluorescent powder doped in the powder used in the second laser radiation process form a color conversion layer capable of converting red or green, so that the manufacturing process of manufacturing the three-color display screen is simplified.
In one possible implementation, spreading the powder on a substrate includes:
and spreading the powder on the substrate, and spreading the powder on the substrate in a scraper mode.
According to the method, the powder is scattered on the substrate, and the powder on the substrate is spread in a scraper mode, so that the problem that the thickness of the color conversion layer is different after laser radiation can be solved.
In one possible implementation, the powder includes: the powder comprises a polymer and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15-60%; or
The powder comprises a polymer and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15-60%; or
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 15-60%.
The method can include a polymer and a quantum dot in the powder, the quantum dot accounts for 15-60% of the weight of the powder, the quantum dot is used as a luminescent material, the polymer is used as a base material, or the powder includes the polymer and the fluorescent powder, wherein the fluorescent powder accounts for 15-60% of the weight of the powder, the fluorescent powder is used as a luminescent material, the polymer is used as a base material, or the polymer is used as a base material, the quantum dot and the fluorescent powder are used as a luminescent material, and the quantum dot and the fluorescent powder account for 15-60% of the weight of the powder. The polymer can be when laser is radiated for the polymer takes place the melting effect, can be with quantum dot melting on the position of predetermined pixel, thereby form the color conversion layer, solidify naturally at the powder of melting, compare in the inkjet printing mode and the preparation color conversion layer of photoresist technology that adopt among the prior art, reduced the process of solidification, thereby make preparation technology simpler.
In one possible implementation, the polymer is nylon, or polyethylene terephthalate, or polymethyl methacrylate.
In the above method, the material of a common optical resin such as nylon, polyethylene terephthalate, or polymethyl methacrylate is used as a base material, and the efficiency of the polymer melting effect can be improved.
In a possible implementation manner, when the powder comprises a polymer and quantum dots, the mass fraction of the quantum dots in the powder is 20% -40%; or
When the powder comprises a polymer and fluorescent powder, the mass fraction of the fluorescent powder in the powder is 20-40%; or
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 20-40%.
According to the method, when the powder comprises the polymer and the quantum dot, the mass fraction of the quantum dot in the powder is 20% -40%, or when the powder comprises the polymer and the fluorescent powder, the mass fraction of the fluorescent powder in the powder is 20% -40%, wherein the mass fraction of the quantum dot in the powder is 20% -40%, or the mass fraction of the fluorescent powder in the powder is 20% -40%, or when the powder comprises the polymer, the quantum dot and the fluorescent powder, the mass fractions of the quantum dot and the fluorescent powder in the powder are 20% -40%, the quantum dot and/or the fluorescent powder can be better combined 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.
In a possible implementation manner, the particle size of the powder is 1-50 microns.
According to the method, the polymer and the quantum dots are adopted to form the particles, or the polymer and the fluorescent powder are adopted to form the particles, the particle size of the particles is 1-50 micrometers, and in the manufacturing process of the color conversion film, when laser irradiates powder at the position of a preset pixel point, the powder can be tightly fused on the substrate.
In a possible implementation manner, the particle size of the powder is 3-15 microns.
According to the method, the polymer and the quantum dots are adopted to form the particles, or the polymer and the fluorescent powder are adopted to form the particles, the particle size of the particles is 3-15 micrometers, and in the manufacturing process of the color conversion film, when laser irradiates powder at the position of a preset pixel point, the powder can be more tightly fused on the substrate.
In one possible implementation, the powder is prepared by a method comprising:
dispersing the quantum dots or the fluorescent powder into a polymer to obtain a polymer solution;
and preparing the polymer solution into powder doped with quantum dots or fluorescent powder by adopting a closed cavity low-pressure powder spraying and atomizing mode.
According to the method, the quantum dots and/or the fluorescent powder are dispersed in the polymer to obtain the polymer solution, and the polymer solution is prepared into the powder doped with the quantum dots or the fluorescent powder in a closed cavity low-pressure powder spraying atomization mode, so that the powder can be prepared in a large scale, and the yield of the prepared powder is improved.
In a second aspect, the present application also provides a display device, comprising:
a backlight assembly for generating a backlight;
the color conversion layer is positioned on the light emitting side of the backlight assembly and used for carrying out color conversion on backlight, and the color conversion layer is prepared by the preparation method of any one of the embodiments.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention and are not to be construed as limiting the invention.
FIG. 1 is a schematic diagram of a wet ink jet printing process to form a color conversion layer according to the background art;
FIG. 2 is a schematic flow chart of a method for preparing a color conversion layer per laser irradiation process according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of preparing a color conversion layer upon one laser irradiation according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method of making a color conversion layer upon two laser irradiations according to an embodiment of the present invention;
FIG. 5A is a schematic view of a powder coated on a substrate according to an embodiment of the invention;
FIG. 5B is a schematic diagram of a laser irradiating a powder spread on a substrate in accordance with an embodiment of the present invention;
FIG. 5C is a schematic illustration of an embodiment of the invention after laser irradiation of the powder and removal of the non-irradiated powder;
FIG. 5D is a schematic diagram of one embodiment of the present invention in which one powder is laser irradiated and another powder is deposited on the substrate;
FIG. 5E is a schematic diagram of another powder with laser radiation applied to a substrate according to an embodiment of the present invention;
FIG. 5F is a schematic diagram illustrating another powder without irradiation being cleaned after another powder is irradiated by laser light in accordance with an embodiment of the present invention;
FIG. 5G is a schematic diagram of a powder being spread on a substrate that has been irradiated by a laser according to an embodiment of the present invention;
FIG. 5H is a schematic view of the powder laid on the substrate after the second laser irradiation at the position of the first irradiation in accordance with the embodiment of the present invention;
FIG. 5I is a schematic illustration of an embodiment of the invention after cleaning of the non-irradiated powder after second laser irradiation of the powder;
FIG. 6 is a schematic illustration of a laser irradiated double formed color conversion layer according to an embodiment of the present invention;
FIG. 7 is a flow chart of a method of making a color conversion layer upon multiple laser irradiations in accordance with an embodiment of the present invention;
fig. 8 is a flowchart of a method for preparing a powder doped with quantum dots according to an embodiment of the present invention;
FIG. 9 is a flow chart of a method for preparing phosphor-doped powder according to an embodiment of the present invention;
FIG. 10 is a flow chart of a method for preparing a powder doped with quantum dots and phosphor according to an embodiment of the present invention;
FIG. 11 is a schematic view of an apparatus corresponding to a powder preparation method according to an embodiment of the present invention;
FIG. 12 is a flowchart of a method for preparing quantum dot doped powder from a nylon solution according to an embodiment of the present invention;
FIG. 13 is a flowchart of a method for preparing phosphor-doped powder using a nylon solution according to an embodiment of the present invention;
FIG. 14 is a flow chart of a method for preparing a powder doped with quantum dots and phosphor using a nylon solution according to an embodiment of the present invention;
FIG. 15 is a flow chart of a method for preparing a powder doped with quantum dots by using a PET solution according to an embodiment of the present invention;
FIG. 16 is a flow chart of a method for preparing phosphor-doped powder using a PET solution according to an embodiment of the present invention;
FIG. 17 is a flow chart of a method for preparing a powder doped with quantum dots and phosphor using a PET solution according to an embodiment of the present invention;
FIG. 18 is a flow chart of a method for preparing quantum dot doped powder from PMMA solution according to an embodiment of the present invention;
FIG. 19 is a flow chart of a method for preparing phosphor-doped powder from PMMA solution according to an embodiment of the present invention;
FIG. 20 is a flowchart of a method for preparing quantum dot and phosphor doped powder from PMMA solution according to an embodiment of the present invention;
fig. 21 is a structural view of a display device of an embodiment of the present invention;
fig. 22 is a structural view of another display device according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The application scenario described in the embodiment of the present invention is for more clearly illustrating the technical solution of the embodiment of the present invention, and does not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems. Wherein, in the description of the present invention, unless otherwise indicated, "a plurality" means.
At present, a wet inkjet printing method is adopted, which firstly needs to manufacture quantum dot ink 14, then a Black-Matrix (BM) 11, and as shown in fig. 1, BM11 is placed on a substrate 12, and the quantum dot ink 14 is printed on the BM11 by using a nozzle 13, and meanwhile, since the quantum dot ink 14 is a solution, curing is also needed, and the manufactured color conversion layer with the BM11 is cured. Meanwhile, in the process of adopting quantum dot ink-jet printing, because the quantum dots and the dispersed particles have different sizes, the particle size of the quantum dots is generally smaller than 30 nanometers, and the particle size of the dispersed particles can be generally 50 nanometers to 5000 nanometers, the quantum dots and the dispersed particles can be dispersed unevenly in ink to cause blockage of a printing nozzle, or the quantum dots and the dispersed particles can be layered after being placed for a long time under the condition of higher temperature. Therefore, in the wet inkjet printing process, when the manufacturing process is complicated, the problem that the printing nozzle is easy to block exists.
The process of preparing the color conversion layer by the dry method comprises the following steps: the method comprises the steps of preparing a material doped with quantum dots, then forming dry powder by using ink doped with the quantum dots, and spraying the material doped with the quantum dots onto a substrate in an air flow mode. The airflow is blocked at different positions on the surface of the substrate during the printing process, however, as the printing process progresses, the shape encountered by the airflow is changed due to the material just deposited at the top end of the airflow, so that the thickness of the sprayed material doped with the quantum dots on the substrate is uneven.
The photoresist process mainly comprises the steps of dispersing fluorescent powder in photoresist for coating, photoetching through a mask plate, and then developing, however, the material utilization rate is very low when the photoresist process is adopted for preparation, and meanwhile, the film forming rate of a color conversion layer is not high due to the defect factor of the quality of the mask plate.
In summary, the conventional method for fabricating a color conversion layer is not only complicated in process, but also has a low film-forming rate due to the auxiliary tool, such as a mask, during the fabrication process.
The embodiment of the invention provides a preparation method of a color conversion layer, which can adopt a polymer doped with quantum dots or fluorescent powder to be paved on a substrate, then according to the position of a preset pixel point, laser is adopted to radiate the polymer paved with the quantum dots or the fluorescent powder, so that the polymer doped with the quantum dots or the fluorescent powder at the position is melted to obtain the pixel point at the position, and the problem of high difficulty in manufacturing the color conversion layer caused by the complicated process of preparing the color conversion layer by adopting an ink-jet printing mode and a photoresist process can be solved.
With respect to the above scenario, the following describes an embodiment of the present invention in further detail with reference to the drawings of the specification.
The embodiment of the invention provides a preparation method of a color conversion layer, which comprises the following steps:
performing at least one laser irradiation process on the powder spread on the substrate to form a color conversion layer on the substrate;
wherein the following steps are performed for each laser irradiation process: as shown in connection with figure 2 of the drawings,
step S201: spreading powder on a substrate, wherein the powder is a polymer doped with quantum dots or fluorescent powder;
step S202: according to the position of a preset pixel point, radiating the powder laid on the substrate by adopting laser to melt the powder on the position;
step S203: and removing powder which is not irradiated by the laser on the substrate.
In the method, the powder is the polymer doped with quantum dots or fluorescent powder, when the polymer is radiated by laser according to the position of the preset pixel point, the polymer generates a melting effect under the laser, the powder at the position can be heated to a melting point and melted and bonded together, and is melted on the substrate, namely the quantum dots fall on the position, and meanwhile, the laser radiation powder is locally heated, so that after the powder at the position is radiated by the laser, the powder of the quantum dots and/or the fluorescent powder can be solidified on the substrate without a special solidification process. Or the problem of quantum dot and dispersed particle layering can be caused by long-time placement under the condition of high temperature, meanwhile, the steps of manufacturing a grid baffle and curing are not needed, meanwhile, the problem of uneven thickness of a material sprayed and mixed with quantum dots on a substrate due to the fact that airflow is blocked at different positions on the surface of the substrate in the printing process of the airflow in a powder mode is solved, and the problem of low film forming rate of a color conversion layer due to the defects of mask quality and the like is solved.
In step S202, the position of the pixel point in the color conversion layer is determined according to the position of the preset pixel point.
In addition, for the photoresist, the photoresist removed by development cannot be reused, so that the material utilization rate is very low, and the process of using high-cost quantum dots/fluorescent powder is not suitable, and therefore, in the embodiment of the present invention, the step of removing the powder on the substrate that is not irradiated by the laser may be to remove the powder on the substrate that is not irradiated by the laser by using an air flow.
It can be understood that after the laser is used for irradiating the powder spread on the substrate, the powder is still arranged at the position which is not irradiated by the laser, so that the gas blowing can be carried out on the substrate, and because the powder which is not irradiated is powdery, the powder which is not irradiated can be separated from the substrate in the process of blowing the substrate, and the powder which is cleaned on the substrate and is doped with the quantum dots or the fluorescent powder is recycled, so that the powder can be reused.
In the embodiment of the invention, the powder used for forming different color conversion layers contains different quantum dots and/or different fluorescent powder contents;
wherein, the different quantum dots comprise different quantum dot contents and/or different quantum dot particle sizes;
different color conversion layers convert light into different colors.
Specifically, when the color conversion layer converts colors differently, the powder doped with quantum dots and/or phosphor is also different, wherein, for the quantum dots, the factor for converting the different colors may be content or particle size. The components for forming the quantum dots can contain perovskite systems, cadmium selenide systems, indium phosphide systems and copper indium sulfide systems. The proportions of the components making up the quantum dots are also different for emitting different colors. The particle size of the formed quantum dots can also emit different colors for the same component. Therefore, the present invention can produce quantum dots in consideration of both the content and the particle size of the quantum dots when different colors are converted by the color conversion layer as needed. Meanwhile, for the powder corresponding to the quantum dots capable of emitting light of different colors, different radiation times are required for radiation. When the powder is doped with the fluorescent powder, the fluorescent powder with different luminescent colors can be adjusted according to the components and the proportion. For example, KSF powder may be used as the red-emitting phosphor, and GaYAG powder or YAG powder may be used as the green-emitting phosphor. Wherein, the particle size of the fluorescent powder can be less than 15 microns. When the powder doped with the quantum dots and the fluorescent powder is used, the quantum dots and the fluorescent powder with different luminescent colors can be adjusted according to the components and the proportion of the quantum dots and the fluorescent powder.
In the embodiment of the invention, the positions of the preset pixel points are different for different color conversion layers.
In detail, for the color conversion layers converting different colors, the positions of the preset pixels corresponding to each color are also different.
In the existing process of preparing the color conversion layer, the thickness of the color conversion layer prepared by ink-jet printing each time is about 2 microns, for example, the thickness of the color conversion layer prepared by adopting quantum dots or fluorescent powder is mainly dependent on the thickness of BM, the thickest thickness of the BM which can be prepared at present is about 10 microns, and the process realization difficulty is high for the thicker color conversion layer. The thickness of BM tends to be thinner, and the process requirement of thicker BM preparation necessarily reduces the Optical Density (OD) value of BM, so that the display effect of insufficient blackness under a black background is achieved.
Based on this, in the embodiment of the present invention, the number N of times of irradiation using the powder for forming 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.
And in the process of executing laser radiation for forming the color conversion layer each time, the positions of the preset pixel points are the same.
In detail, the thickness of the color conversion layer can be increased through the number of times of laser radiation, the number of times of radiation N of the powder for forming the color conversion layer can be determined by knowing the thickness of the color conversion layer formed once by the laser radiation and dividing the total thickness required by the color conversion layer by the thickness of the color conversion layer formed once by the laser radiation, and then the repeated radiation is carried out at the same position of the pixel point, that is, the thickness of the powder fused at the position can be increased, namely, the thickness of the color conversion layer is increased. Compared with the prior art, the invention can form the color conversion layer with large thickness only by repeatedly spreading powder on the same position and repeatedly radiating, thereby reducing the process difficulty of manufacturing the color conversion layer with large thickness.
In the embodiments of the present invention, the color conversion layer can be prepared by performing laser irradiation once, that is, by performing laser irradiation once. As shown in fig. 3, the following steps are performed:
step S301: spreading the powder used at this time on a substrate, wherein the powder is a polymer doped with quantum dots or fluorescent powder;
step S302: according to the positions of preset pixel points, radiating the powder used this time spread on the substrate by adopting laser, and forming a color conversion layer by melting the powder used this time on the positions;
step S303: and removing the powder which is not radiated by the laser and is used at this time on the substrate.
In the embodiment of the present invention, if the color conversion layer can be formed by performing the laser irradiation process twice, that is, by performing the laser irradiation process twice, it can be performed as shown in fig. 4,
step S401: spreading the first-time used powder on a substrate;
step S402: and according to the position of the preset pixel point corresponding to the first time, radiating the powder spread on the substrate by adopting laser to melt the powder at the position.
Step S403: the first-time-use powder that is not irradiated with the laser light on the substrate is removed.
Step S404: spreading the powder used for the second time on the substrate;
step S405: and according to the position of the preset pixel point corresponding to the second time, radiating the powder paved on the substrate by adopting laser to melt the powder at the position.
Step S406: and removing the secondarily used powder which is not irradiated by the laser on the substrate.
When the powder that laser radiation corresponds twice is different, can form different color conversion layers, it is shown in combination with fig. 6, the schematic diagram that shows twice laser radiation's result, wherein, twice laser radiation forms the pixel of color conversion layer and is 5 x 6, every transversely includes 5 pixel, every vertically includes 6 pixel, and be a plurality of pixel of two kinds of differences, first pixel is the square frame that slant ascending whippletree formed, first pixel is the pixel that the powder that uses for the first time corresponds the formation, laser radiation forms 18 the same first pixel each time, second pixel is the square frame that the dot formed, second pixel is the pixel that the powder that uses for the second time corresponds the formation, laser radiation forms 12 the same second pixel each time.
The powder used for the first time in fig. 6 corresponds to formed pixel points, wherein the positions of the preset pixel points corresponding for the first time are a first line, a third line, a fifth line, three positions from left to right, a second line, a fourth line, a sixth line, and three positions at the last, and the positions of the pixel points corresponding for the second time in fig. 6 are a second line, a fourth line, a sixth line, two positions from left to right, a first line, a third line, a fifth line, and two positions at the last.
As an example, the powder used for the first time is powder 52, and the powder used for the second time is powder 53. With reference to fig. 5A, first laying the first-time used powder 52 on the substrate 51, with reference to fig. 5B, according to the preset positions of the first-time corresponding pixels, i.e. the first row and the third row and the fifth row as shown in fig. 6, the three positions from left to right, the second row, the fourth row, the sixth row, and the last three positions, irradiating the first-time used powder 52 laid on the substrate 51 with laser emitted from a laser emitting device 54, melting the polymer at the position of the current corresponding pixel, forming a square grid of a slash in fig. 5B, melting the powder at the positions of the three pixels from left to right, the position of the pixel shown in fig. 5B being a schematic diagram of a cross section of fig. 6, that is, after the irradiation of the first-time corresponding pixel is completed, the first row, the third row, and the fifth row, the three positions from left to right, the second line, the fourth line, the sixth line, and the last three positions, where pixel points corresponding to the powder 52 are formed. As shown in fig. 5C, the powder 52 that is not irradiated by the laser on the substrate 51 is removed, the powder corresponding to 18 pixel points formed after the irradiation is left on the substrate, and the powder 52 on the first row, the third row, the fifth row, the last two positions, the second row, the fourth row, and the sixth row, two positions before the left to right, are removed except the powder 52 corresponding to the 18 pixel points in the powder.
With reference to fig. 5D, the powder 53 for the second use is laid on the substrate 51, that is, another layer of other powder is laid, wherein the positions of 18 pixels formed by the first radiation are not laid upward any more, and are only at the same height as the first laying height, with reference to fig. 6, the powder 53 for the second use is laid on the positions of the first row, the third row, the fifth row, the last two positions, the second row, the fourth row, and the sixth row, which are two positions before from left to right, according to the positions of the pixels corresponding to the second time, that is, the first row, the third row, the fifth row, the last two positions, the second row, the fourth row, and the sixth row, which are two positions before from left to right, the powder 53 laid on the substrate 51 is irradiated with the laser emitted from the laser emitting device 54 to fuse the powder in the first row, the third row, and the fifth row, the last two positions, the second line, the fourth line and the sixth line, are two positions from left to right, and at the positions, pixel points corresponding to the powder 53 are formed. Referring to fig. 5F, the second powder 53 not irradiated by the laser is removed from the substrate 51, and after the irradiation is completed twice, a color conversion layer having a resolution of 5 × 6 as shown in fig. 6 is formed.
In the practical application process, when a display is manufactured, the manufactured color conversion layer is usually required to be capable of converting three colors of red, green and blue light, and in general, blue laser can be adopted for radiation, so that when the color conversion layer is formed, only two times of radiation are required, in the embodiment of the invention, if two laser radiation processes are carried out, then:
the particle size of the red quantum dots doped in the powder used in the first laser radiation process is 7-20 nanometers, and the particle size of the green quantum dots doped in the powder used in the second laser radiation process is 4-15 nanometers, or the particle size of the green quantum dots doped in the powder used in the first laser radiation process is 4-15 nanometers, and the particle size of the red quantum dots doped in the powder used in the second laser radiation process is 7-20 nanometers; or
Red fluorescent powder doped in the powder used in the first laser radiation process, green fluorescent powder doped in the powder used in the second laser radiation process, or green fluorescent powder doped in the powder used in the first laser radiation process, and red fluorescent powder doped in the powder used in the second laser radiation process.
In the process of thickening the color conversion layer, the radiation is performed twice, or the radiation is performed twice at the position of the same pixel point. Taking the irradiated powder 52 as an example, with reference to fig. 5A to 5C, the first irradiation is performed, the powder 52 is irradiated by the laser, and pixels corresponding to the powder 52 are formed at the predetermined positions. As shown in fig. 5G, the powder 52 is spread on the substrate having the first irradiation, and as shown in fig. 5H, in the second irradiation process, the powder is spread on the irradiated position for irradiation, so that the thickness of the pixel point at the position, that is, the thickness of the color conversion layer can be increased. Referring to fig. 5I, powder 52 that is not irradiated by the laser is removed.
During multiple laser shots, the steps shown in fig. 7 can be performed, in conjunction with fig. 7:
step S701: the powder used this time was spread on a substrate.
Step S702: and according to the preset position of the pixel point corresponding to the time, radiating the powder spread on the substrate by adopting laser to melt the powder at the position.
Step S703: and removing powder which is not irradiated by the laser on the substrate.
Step S704: judging whether the radiation frequency reaches a set frequency; if yes, step S705 is performed, and if no, step S701 is performed.
Step S705: the radiation is stopped.
Since the powder is scattered on the substrate, and the thickness of the powder on the substrate may be different when scattering, in the embodiment of the present invention, the spreading of the powder on the substrate includes:
and scattering the powder on the substrate, and spreading the powder on the substrate in a scraper mode.
After the powder is scattered on the substrate, the scraper is adopted to scrape the powder, so that the problem of different thicknesses of the color conversion layers can be solved.
The powder in the method for preparing the color film layer in the above embodiment and the method for preparing the powder are described below.
The embodiment of the invention provides a powder, which comprises: the polymer and the quantum dots, wherein the mass fraction of the quantum dots in the powder is 15-60%; or
The powder comprises a polymer and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15-60%; or
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 15-60%.
The preparation method of the low-pressure atomized powder of the powder doped with quantum dots, disclosed by the embodiment of the invention, is combined with the steps shown in fig. 8, and comprises the following steps:
step S801: dispersing the quantum dots into a polymer to obtain a polymer solution;
step S802: and preparing the polymer solution into powder doped with quantum dots by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the quantum dots in the powder is 15-60%.
Referring to fig. 11, a device 1101 for containing a polymer solution is connected to a device 1102 for preparing low vacuum powder, particles of quantum dots are added to the polymer solution to obtain a polymer solution doped with quantum dots, and then the polymer solution is prepared into powder doped with quantum dots by a closed cavity low pressure powder spraying atomization method by using the low vacuum powder preparation device 1102.
Alternatively, the preparation method of the phosphor doped in the embodiment of the present invention, as shown in fig. 9, includes the following steps:
step S901: dispersing fluorescent powder into a polymer to obtain a polymer solution;
step S902: and preparing the polymer solution into powder doped with fluorescent powder by adopting a closed cavity low-pressure powder spraying and atomizing mode, wherein the mass fraction of the fluorescent powder in the powder is 15-60%.
Similarly, as shown in fig. 11, the phosphor powder may be added into a device 1101 containing a polymer solution to obtain a polymer solution doped with the phosphor powder, and then the polymer solution may be prepared into the phosphor powder-doped powder by a low vacuum powder preparation device 1102 and by a closed cavity low pressure powder spraying and atomizing manner.
Alternatively, the preparation method of the quantum dot and phosphor doped phosphor of the embodiment of the invention, shown in fig. 10, includes the following steps:
step S1001: dispersing the quantum dots and the fluorescent powder into a polymer to obtain a polymer solution;
step S1002: and preparing the polymer solution into powder doped with quantum dots and fluorescent powder by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15-60%.
The embodiment of the present invention further provides a powder, including: nylon and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15-60%, or
The powder comprises: nylon and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15-60 percent, or
The powder comprises: nylon, quantum dots and fluorescent powder, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15-60%.
The preparation method of the quantum dot-doped powder according to the embodiment of the invention is shown in fig. 12, and includes the following steps:
step S1201: dispersing the quantum dots into a nylon solution to obtain a nylon solution doped with the quantum dots;
step S1202: the nylon solution doped with the quantum dots is prepared into powder doped with the quantum dots by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the quantum dots in the powder is 15-60%.
Alternatively, the preparation method of the phosphor-doped powder according to the embodiment of the present invention, as shown in fig. 13, includes the following steps:
step S1301: dispersing fluorescent powder into a nylon solution to obtain a fluorescent powder-doped nylon solution;
step S1302: the nylon solution doped with the fluorescent powder is prepared into powder doped with the fluorescent powder by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the fluorescent powder in the powder is 15-60%.
Alternatively, the preparation method of the powder doped with the quantum dots and the phosphor in the embodiment of the present invention, as shown in fig. 14, includes the following steps:
step S1401: dispersing the quantum dots and the fluorescent powder into a nylon solution to obtain the nylon solution doped with the quantum dots and the fluorescent powder;
step S1402: the nylon solution doped with the quantum dots and the fluorescent powder is prepared into powder doped with the quantum dots and the fluorescent powder by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15-60%.
The embodiment of the present invention further provides a powder, including: polyethylene terephthalate (PET) and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15-60%, or
The powder comprises: PET and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15-60 percent, or
The powder comprises: PET, quantum dots and fluorescent powder, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15-60%.
The preparation method of the quantum dot-doped powder according to the embodiment of the invention is shown in fig. 15, and includes the following steps:
step S1501: dispersing the quantum dots into a PET solution to obtain the PET solution doped with the quantum dots;
step S1502: preparing the PET solution doped with the quantum dots into powder doped with the quantum dots by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the quantum dots in the powder is 15-60%.
Alternatively, the preparation method of the phosphor-doped powder according to the embodiment of the present invention, as shown in fig. 16, includes the following steps:
step S1601: dispersing the fluorescent powder into the PET solution to obtain the PET solution doped with the fluorescent powder;
step S1602: preparing the PET solution doped with the fluorescent powder into powder doped with the fluorescent powder by adopting a low-pressure powder spraying and atomizing mode of a closed cavity, wherein the mass fraction of the fluorescent powder in the powder is 15-60%.
Alternatively, the preparation method of the powder doped with the quantum dots and the phosphor in the embodiment of the present invention, as shown in fig. 17, includes the following steps:
step S1701: dispersing the quantum dots and the fluorescent powder into a PET solution to obtain the PET solution doped with the quantum dots and the fluorescent powder;
step 1702: the PET solution doped with the quantum dots and the fluorescent powder is prepared into powder doped with the quantum dots and the fluorescent powder by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15-60%.
The embodiment of the present invention further provides a powder, including: polymethyl methacrylate (PMMA) and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15-60%, or
The powder comprises: PMMA and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15-60 percent, or
The powder comprises: PMMA, quantum dots and fluorescent powder, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15-60%.
The preparation method of the quantum dot-doped powder according to the embodiment of the invention, shown in fig. 18, includes the following steps:
step S1801: dispersing the quantum dots into a PMMA solution to obtain a PMMA solution doped with the quantum dots;
step S1802: and preparing the PMMA solution doped with the quantum dots into powder doped with the quantum dots by adopting a closed cavity low-pressure powder spraying and atomizing mode, wherein the mass fraction of the quantum dots in the powder is 15-60%.
Alternatively, the preparation method of the phosphor-doped powder according to the embodiment of the present invention, as shown in fig. 19, includes the following steps:
step S1901: dispersing fluorescent powder into the PMMA solution to obtain a PMMA solution doped with the fluorescent powder;
step S1902: and preparing the PMMA solution doped with the fluorescent powder into powder doped with the fluorescent powder by adopting a closed cavity low-pressure powder spraying and atomizing mode, wherein the mass fraction of the fluorescent powder in the powder is 15-60%.
Alternatively, the preparation method of the powder doped with the quantum dots and the phosphor in the embodiment of the present invention, as shown in fig. 20, includes the following steps:
step S2001: dispersing the quantum dots and the fluorescent powder into a PMMA solution to obtain a PMMA solution doped with the quantum dots and the fluorescent powder;
step S2002: and preparing the PMMA solution doped with the quantum dots and the fluorescent powder into powder doped with the quantum dots and the fluorescent powder by adopting a closed cavity low-pressure powder spraying atomization mode, wherein the mass fraction of the quantum dots and the fluorescent powder in the powder is 15-60%.
In the embodiment of the invention, the powder comprises a plurality of particles, each particle comprises a quantum dot and a polymer, or each particle comprises fluorescent powder and a polymer, and the particle size of the particles in the powder is 1-50 micrometers.
In the embodiment of the invention, the particle size of the powder is 3-15 microns.
Wherein the average particle diameter of the particles in the powder can be 2-6 microns.
In the embodiment of the invention, when the powder comprises the polymer and the quantum dots, the mass fraction of the quantum dots in the powder is 20-40%; or
When the powder comprises polymer and fluorescent powder, the mass fraction of the fluorescent powder in the powder is 20-40%.
An embodiment of the present invention further provides a display device, including:
a backlight assembly for generating a backlight;
the color conversion layer is positioned on the light emitting side of the backlight assembly and used for carrying out color conversion on backlight, and the color conversion layer is prepared by the preparation method of any one of the embodiments.
In practical application, the display device further comprises a circuit board, and the structure of the display device comprises the following two modes:
referring to fig. 21, the circuit board is divided into a top plate 2130 and a bottom plate 2020, and the top plate 2130 and the bottom plate 2020 have different polarities, wherein the bottom plate 2120 is disposed on the side opposite to the light emitting side of the backlight assembly 2110, and the color conversion layer 2140 and the top plate 2130 are disposed on the light emitting side of the backlight assembly 2110.
As shown in fig. 22, the circuit board 2230 is disposed on the side opposite to the light exit side of the backlight assembly 2210, and the color conversion layer 2220 is disposed on the light exit side of the backlight assembly 2210.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A method for preparing a color conversion layer is characterized by comprising the following steps:
performing at least one laser irradiation process on the powder spread on the substrate to form a color conversion layer on the substrate;
wherein each of the laser irradiation processes performs the steps of:
spreading the powder on a substrate, wherein the powder is a polymer doped with quantum dots and/or fluorescent powder;
according to the position of a preset pixel point, radiating powder laid on a substrate by adopting laser to melt the powder at the position;
and removing powder which is not irradiated by the laser on the substrate.
2. The method of claim 1, wherein the powders used to form different color conversion layers contain different quantum dots and/or different phosphors with different contents or types;
wherein the different quantum dots comprise different quantum dot contents and/or different quantum dot particle sizes;
the different color conversion layers convert light into different colors.
3. The method of preparing a color conversion layer according to claim 1, further comprising:
determining the number N of times of irradiation by using powder for forming the color conversion layer according to the thickness of the color conversion layer, and executing a laser irradiation process for forming the color conversion layer for N times;
and in the process of executing laser radiation for forming the color conversion layer each time, the positions of preset pixel points are the same.
4. The method of claim 1, wherein if two laser irradiation processes are performed, then:
the grain diameter of the red quantum dots doped in the powder used in the first laser radiation process is 7-20 nanometers, the grain diameter of the green quantum dots doped in the powder used in the second laser radiation process is 4-15 nanometers, or the grain diameter of the green quantum dots doped in the powder used in the first laser radiation process is 4-15 nanometers,
the grain diameter of the red quantum dots doped in the powder used in the second laser radiation process is 7-20 nanometers; or
Red fluorescent powder doped in the powder used in the first laser radiation process, green fluorescent powder doped in the powder used in the second laser radiation process, or green fluorescent powder doped in the powder used in the first laser radiation process, and red fluorescent powder doped in the powder used in the second laser radiation process.
5. The method of manufacturing a color conversion layer according to claim 1, wherein spreading the powder on a substrate comprises:
and spreading the powder on the substrate, and spreading the powder on the substrate in a scraper mode.
6. The method of manufacturing a color conversion layer according to claim 1, wherein the powder comprises: the powder comprises a polymer and quantum dots, wherein the mass fraction of the quantum dots in the powder is 15-60%; or
The powder comprises a polymer and fluorescent powder, wherein the mass fraction of the fluorescent powder in the powder is 15-60%; or
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 15-60%.
7. The method of claim 1, wherein the polymer is nylon, polyethylene terephthalate, or polymethyl methacrylate.
8. The method of claim 1, wherein the powder has a particle size of 3 to 15 μm.
9. The method of preparing a color conversion layer according to claim 1, wherein the powder is prepared by a method comprising:
dispersing the quantum dots and/or the fluorescent powder into a polymer to obtain a polymer solution;
and preparing the polymer solution into powder doped with quantum dots or fluorescent powder by adopting a closed cavity low-pressure powder spraying and atomizing mode.
10. A display device, comprising:
a backlight assembly for generating a backlight;
a color conversion layer located on the light-emitting side of the backlight assembly for color converting the backlight, the color conversion layer being prepared by the preparation method of any one of claims 1 to 9.
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