阅读说明：本技术 一种量子点丝印导光板补色膜制作方法 (Method for manufacturing complementary color film of quantum dot silk-screen light guide plate ) 是由 叶芸 潘建豪 郭太良 江宗钊 陈恩果 徐胜 于 2019-11-08 设计创作，主要内容包括：本发明涉及一种量子点丝印导光板补色膜制作方法。先进行导光板自动印刷,此过程通过机器印刷避免人工印刷的缓慢和印刷质量的参差不齐,然后进行自动亮度检测,亮度计在离导光板固定距离内自动移动进行检测,精准快捷,再代入色度衰减公式计算改变3D打印喷涂量子点的频率,以改变膜中量子点不同位置浓度起到补色作用。从导光板的网点自动印刷,到导光板色差自动检测识别,再进行3D打印制作补色膜,全程由主控计算机进行协调控制达到更高的制作精密性,有针对性对印刷导光板补色而且系统化使速度提高,同时改进工业生产方式提高了丝印导光板显示色域和市场竞争力,具有很大的应用前景。(The invention relates to a method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate. Carry out light guide plate automatic printing earlier, this process avoids artifical printing slow and the printing quality's discrepancy through machine printing, then carries out automatic brightness detection, and the luminance meter detects from light guide plate fixed distance interior automatically move, and is accurate swift, substitutes the chroma attenuation formula again and calculates the frequency that changes 3D and print spraying quantum dot to change the different position concentrations of quantum dot in the membrane and play the anaglyph effect. The method comprises the steps of automatically printing the mesh points of the light guide plate, automatically detecting and identifying the color difference of the light guide plate, then carrying out 3D printing to manufacture the color compensation film, carrying out coordination control in the whole process by a main control computer to achieve higher manufacturing precision, performing targeted color compensation on the printed light guide plate, improving the speed systematically, improving the industrial production mode, improving the display color gamut and the market competitiveness of the silk-screen light guide plate, and having great application prospect.)

1. A method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate is characterized by comprising the following steps:

s1, preparing quantum dot slurry, printing the slurry on a light guide plate by a full-automatic screen printing method, forming mesh points of quantum dots on the light guide plate, and drying the mesh points in a drying system;

step S2, the dried light guide plate enters an automatic brightness detection instrument for color coordinate detection and recording, the recorded color coordinate value is input into a main control computer and is input into a chromaticity attenuation formula, and the k value is determined through computer calculation;

step S3, inputting the k value into a 3D printer by a computer, and after a first layer of waterproof oxygen film is attached to a complementary color film die below the 3D printer, changing the printing frequency f to print the complementary color film according to the obtained k value;

and step S4, after the color compensation film is printed successfully, a second layer of waterproof oxygen film is attached to carry out ultraviolet light curing, and then the light guide plate, the color compensation film, the brightness enhancement film and the diffusion film are attached in sequence.

2. The method for manufacturing the complementary color film of the quantum dot silk-screen light guide plate according to claim 1, wherein in the step S1, the ratio of red and green quantum dots of the quantum dot slurry is 1:8 to 1:16, and the quantum dot light guide dot material is selected from a group II-VI compound or a group III-V compound, is an inorganic compound or an organic compound, and specifically comprises: silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots, and indium arsenide quantum dot materials.

3. The method as claimed in claim 1, wherein in step S1, the light guide plate has a thickness of 0.5mm to 2mm and a light transmittance of 92%, the light guide plate is made of one or more of Polyethylene (PE), polypropylene (PP), polyethylene naphthalate (PEN), Polycarbonate (PC), polymethyl acrylate (PMA), and polymethyl methacrylate (PMMA), and the refractive index of the light guide plate is greater than that of air to satisfy the total reflection condition.

4. The method as claimed in claim 1, wherein in step S1, the light guide plates with different sizes have different dot densities and shapes, and the light guide plates and the bottom dots thereof are simulated according to the formula:

wherein N is the number of dots, r_(x,y)Is the dot size at (x, y), d²The grid area is represented, and the parameters of the light guide plate and the light source are both definite values, so that a and b are both definite values, and the farther away from the light source, the larger the quantity of the mesh points, and the denser the mesh point distribution; the closer to the light source, the smaller the number of the dots, the more sparsely the dots are distributed, wherein the diameter of the quantum dot dots is 200-500 μm, the molar effect is avoided by adopting a randomly distributed array, and the dots matched with the light guide plate are selected to automatically print the light guide dots for obtaining the optimal uniformity.

5. The method as claimed in claim 1, wherein in step S1, the slurry is printed on the light guide plate by a full-automatic screen printer, a caterpillar belt for fixing the light guide plate is arranged below the full-automatic screen printer to convey the light guide plate, the main control computer sets the program to align the light guide plate on the caterpillar belt with the screen plate above the caterpillar belt, the ink box of the full-automatic screen printer sprays the quantum dot ink according to the amount, and then the scraper operates to print the quantum dot ink on the light guide plate.

6. The method as claimed in claim 1, wherein in step S2, the automatic brightness detector measures the brightness and color coordinates of the manufactured light guide plate by eighteen-point method, the measured brightness and color coordinates are automatically input to the main control computer, and the set program is substituted into the chromaticity attenuation formula

η=C-γ；γ=log_|ak|d_(x,y)

Where γ is the actual measured color coordinate, C is the white light standard color coordinate, η is the color coordinate offset, d is_(x,y)In order to vary the distance a from the LED lamp according to the change in the size of the light guide plate, the value of k affects the color coordinate attenuation speed, and the amount of shift η becomes more serious as k becomes larger at the same distance from the LED.

7. The method for manufacturing the complementary color film of the quantum dot silk-screen light guide plate according to claim 1, wherein in the step S3, the complementary color film is a quantum dot film wrapped by an upper water-proof oxygen film and a lower water-proof oxygen film, the water-proof oxygen film is one or more of a polyimide film, a PET film, a composite film with PET as a base material, a PMMA film or a polyvinyl alcohol film, the thickness is 10 μm to 100 μm, the complementary color film is internally added with a quantum dot material selected from II-VI group compounds or III-V group compounds, and the complementary color film is an inorganic compound or an organic compound, and specifically comprises: the color complementing film is a rectangular film and is cured into a film by adding infrared curing glue or ultraviolet curing glue, and the film thickness is 100-200 mu m, 120-220 mu m or 150-240 mu m.

8. The method as claimed in claim 1, wherein in step S4, the brightness enhancement film comprises a multilayer optical film, and includes a first polymer layer and a second polymer layer, the material is one or a combination or a blend of polyester, polycarbonate, polystyrene, styrene-acrylonitrile copolymer, cellulose acetate, polyethersulfone, polymethacrylate, polyurethane, polyvinyl chloride, polycycloolefin, and polyimide, and glass, the first polymer layer is a prism-shaped element array, and the composition is uv-curable glue, and the total thickness of the brightness enhancement film is 75 μm.

9. The method as claimed in claim 1, wherein the diffusion film is a high brightness diffusion sheet having a prism or microlens structure, and the scattering ion type wet particle coating and the surface microstructure type uv coating are printed on the film by a printing process in step S4.

10. The method for manufacturing the complementary color film of the quantum dot silk-screen light guide plate according to claim 1, wherein the manufacturing process flow of the light guide plate is as follows:

(1) weighing red and green quantum dots according to a ratio of 1:8 to 1:16, respectively adding 3-4 ml of toluene into the red and green quantum dots for full dissolution, adding a quantum dot solution into the weighed printing ink with multiple scattering particles by using a liquid transfer gun after dissolution, adding magnetons into the printing ink, stirring and mixing the printing ink with a stirrer at a temperature of 50 ℃ and a rotation speed of 600 revolutions per minute for 2 and half hours until the toluene is uniformly stirred and the toluene evaporation viscosity is proper, and forming quantum dot slurry suitable for printing; dissolving quantum dots in a chlorobenzene solution, carrying out ultrasonic oscillation in a low-power ultrasonic instrument for 5-10 min to uniformly disperse the quantum dots, wherein the mass fraction of the quantum dots is 2wt%, filtering for standby application, then weighing UV glue with the refractive index of 1.48, adding chlorobenzene, and putting the quantum dot solution and the UV glue into two ink storage boxes of 3D printing equipment respectively, wherein the UV glue comprises an acrylate prepolymer, an active monomer and an ultraviolet initiator and accounts for 29.2wt% of the solution;

(2) simulating a light guide plate and bottom mesh points thereof by adopting a light guide plate made of PMMA (polymethyl methacrylate) or PC (polycarbonate), selecting matched mesh points and light guide plates, putting a manufactured printing screen plate on a screen plate fixing support, arranging a light guide plate support and a screen plate support on a crawler, aligning the positions, putting prepared quantum dot slurry in an ink box, descending the screen plate support to be attached to the light guide plate when the light guide plate is conveyed to a fixed position aligned and superposed with the screen plate through the crawler, spraying the quantum dot slurry onto the screen plate by a sprayer in the ink box at the moment, automatically moving a scraper down to the arranged position to carry out scraping screen plate printing after spraying, ascending the screen plate support after printing the mesh points, conveying the light guide plate to an oven by moving the crawler, and baking for 5 minutes at 50 ℃;

(3) the caterpillar band continuously conveys the light guide plate which is baked and dried to an automatic brightness meter, the light guide plate is placed on an automatic brightness meter detection support, the brightness meter moves on an upper slide rail, a lower slide rail, a left slide rail and a right slide rail to detect 18-point color coordinate values, and then the 18-point color coordinate values are input into a main control computer, and according to a chromaticity attenuation formula:

η=C-γ；γ=log_|ak|d_(x,y)

where γ is the actual measured color coordinate, C is the white light standard color coordinate, η is the color coordinate offset, d is_(x,y)In order to keep a distance from the LED lamp, a is changed according to the change of the size of the light guide plate, the k value influences the attenuation speed of the color coordinate, the larger k is, the more serious the color coordinate offset η is when the distance from the LED lamp is the same, and then the computer calculates the printing control k value according to the color coordinate offset value of the light guide plate measured by the 18-point method;

attaching a first waterproof oxygen film to the bottom of the cuboid-shaped complementary color film mold, and setting the pulse frequency of the 3D printer according to the k value calculated by a main control computer:

k∝f

and f is printer frequency, the printing frequency f with large chromatic aberration is large, the spraying frequency f of the quantum dot solution is reduced along with the reduction of the k value, the spraying frequency of the UV adhesive is unchanged, then the quantum dot solution and the UV adhesive are simultaneously sprayed into the mold by a machine, the second water-resisting oxygen film is attached to the quantum dot ink after the spraying is finished, then the ultraviolet curing is carried out, then the mold is detached to obtain the manufactured complementary color film, and the light guide plate and the complementary color film are attached to each other.

Technical Field

The invention belongs to the field of liquid crystal display backlight, and particularly relates to a method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate.

Background

The light guide plate is formed by printing light guide points on the bottom surface of an optical acrylic plate by using optical acrylic and PC plates and then by using a high-tech material which has extremely high reflectivity and does not absorb light through the technologies of laser engraving, V-shaped cross grid engraving and UV screen printing. Quantum dots are nanoscale crystals composed of semiconductor materials. Compared with fluorescent particles, the quantum dot nano material has many advantages, such as that quantum dots can generate denser light in a narrower wavelength band, have high stability, have excellent fluorescence emission property in a visible light region, have continuous distribution of an excitation spectrum, and have the position of a fluorescence peak which can be regulated and controlled along with the physical size of the fluorescence peak.

The quantum dot backlight technology can improve the efficiency of the liquid crystal display device, effectively improves the color reduction capability, and is the most promising color gamut expansion scheme. Compared with quantum dot films, the backlight source in the form of quantum dot mesh points is subjected to screen printing, the use of quantum dot materials is reduced in structural design, thicker quantum dot films are removed, the quantum dot and scattering mesh points are combined, and only ink slurry for printing needs to be changed in a production process, so that the backlight source becomes a new direction for the research of quantum dot backlight technology of enterprises; in the large-size thin silk-screen quantum dot mesh point light guide plate, because the optical path of the side-in light source is increased, the light emitting of the light source on the conversion surface is extremely uneven, the mesh point size of the light inlet side and the far light side needs to be changed in the design of the silk-screen mesh point in the side-in backlight design, so the diameter difference of the mesh points in the front and the back of the large-size thin light guide plate is too large, and the chromaticity attenuation of the near light side and the far light side of the silk-screen quantum dot finished plate presents.

In order to solve the above problems, it is necessary to provide a scheme and a manufacturing system for a light guide plate complementary color film based on quantum dot screen printing, wherein the scheme can be used for manufacturing the complementary color film in a targeted manner to solve the problem of chromaticity attenuation according to different degrees of color differences occurring in the printing process of the light guide plate on the premise of a lateral entering type, thinning type and large-size backlight structure, and can be used for detecting the printed complementary color film for any light guide plate generating chromaticity attenuation. The machine for printing, drying, detecting and printing the parts is connected through the crawler belt, the light guide plate forms a production line for automatic printing, drying, detecting and complementary color film printing and manufacturing, manufacturing time can be effectively saved, the light guide plate can be integrally produced, industrial production cost is saved, and the problem of chromaticity attenuation of the lateral-entering quantum dot type large-size backlight source is solved.

Disclosure of Invention

The invention aims to provide a method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate, which overcomes the defects in the prior art.

In order to achieve the purpose, the technical scheme of the invention is as follows: a method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate comprises the following steps:

s1, preparing quantum dot slurry, printing the slurry on a light guide plate by a full-automatic screen printing method, forming mesh points of quantum dots on the light guide plate, and drying the mesh points in a drying system;

step S2, the dried light guide plate enters an automatic brightness detection instrument for color coordinate detection and recording, the recorded color coordinate value is input into a main control computer and is input into a chromaticity attenuation formula, and the k value is determined through computer calculation;

step S3, inputting the k value into a 3D printer by a computer, and after a first layer of waterproof oxygen film is attached to a complementary color film die below the 3D printer, changing the printing frequency f to print the complementary color film according to the obtained k value;

and step S4, after the color compensation film is printed successfully, a second layer of waterproof oxygen film is attached to carry out ultraviolet light curing, and then the light guide plate, the color compensation film, the brightness enhancement film and the diffusion film are attached in sequence.

In an embodiment of the present invention, in step S1, a ratio of red and green quantum dots of the quantum dot paste is 1:8 to 1:16, and the quantum dot light guide dot material is selected from II-VI group compounds or III-V group compounds, and is an inorganic compound or an organic compound, which specifically includes: silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots, and indium arsenide quantum dot materials.

In an embodiment of the invention, in the step S1, the light guide plate has a thickness of 0.5mm to 2mm, a light transmittance of 92%, the light guide plate is made of one or more of Polyethylene (PE), polypropylene (PP), polyethylene naphthalate (PEN), Polycarbonate (PC), polymethyl acrylate (PMA), and polymethyl methacrylate (PMMA), and a refractive index of the light guide plate material should be greater than a refractive index of air to satisfy a total reflection condition.

In an embodiment of the present invention, in step S1, the light guide plates with different sizes have different dot densities and shapes, and the light guide plate and the bottom dots thereof are simulated according to the formula:

wherein N is the number of dots, r_(x,y)Is the dot size at (x, y), d²The grid area is represented, and the parameters of the light guide plate and the light source are both definite values, so that a and b are both definite values, and the farther away from the light source, the larger the quantity of the mesh points, and the denser the mesh point distribution; the closer to the light source, the smaller the number of the dots, the more sparsely the dots are distributed, wherein the diameter of the quantum dot dots is 200-500 μm, the molar effect is avoided by adopting a randomly distributed array, and the dots matched with the light guide plate are selected to automatically print the light guide dots for obtaining the optimal uniformity.

In an embodiment of the present invention, in step S1, the slurry is printed on the light guide plate by using a full-automatic screen printer, a crawler belt for fixing the light guide plate is arranged below the full-automatic screen printer to convey the light guide plate, the main control computer sets a program to align the light guide plate on the crawler belt with the screen plate above the crawler belt, the quantum dot ink is sprayed on the ink cartridge of the full-automatic screen printer according to the amount of the quantum dot ink, and then the quantum dot ink is printed on the light guide plate by the operation of the scraper.

In an embodiment of the present invention, in the step S2, the automatic brightness detecting apparatus can measure the brightness color coordinates of the manufactured light guide plate by eighteen-point method, the measured brightness color coordinates are automatically input into the main control computer after being recorded, and the set program is substituted into the chromaticity attenuation formula

η=C-γ；γ=log_|ak|d_(x,y)

Where γ is the actual measured color coordinate, C is the white light standard color coordinate, η is the color coordinate offset, d is_(x,y)In order to vary the distance a from the LED lamp according to the change in the size of the light guide plate, the value of k affects the color coordinate attenuation speed, and the amount of shift η becomes more serious as k becomes larger at the same distance from the LED.

In an embodiment of the present invention, in step S3, the color compensation film is a quantum dot film wrapped by two upper and lower water-proof oxygen films, the water-proof oxygen film is one or more of a polyimide film, a PET film, a composite film with PET as a base material, a PMMA film, or a polyvinyl alcohol film, the thickness of the water-proof oxygen film is 10 μm to 100 μm, the quantum dot material added in the color compensation film is selected from II-VI group compounds or III-V group compounds, and is an inorganic compound or an organic compound, and specifically includes: the color complementing film is a rectangular film and is cured into a film by adding infrared curing glue or ultraviolet curing glue, and the film thickness is 100-200 mu m, 120-220 mu m or 150-240 mu m.

In an embodiment of the present invention, in step S4, the brightness enhancement film is composed of a multilayer optical film, and includes a first polymer layer and a second polymer layer, the material is one of polyester, polycarbonate, polystyrene, styrene-acrylonitrile copolymer, cellulose acetate, polyethersulfone, polymethacrylate, polyurethane, polyvinyl chloride, polycycloolefin, polyimide, and glass, or a combination or blend thereof, the first polymer layer has a prism-shaped element array, the component of the prism-shaped element array is an ultraviolet light curing adhesive, and the total thickness of the brightness enhancement film is 75 μm.

In an embodiment of the present invention, in step S4, the diffusion film is a high brightness diffusion sheet with a prism or microlens structure, and the scattering ion type wet particle coating and the surface microstructure type uv coating are printed on the film by a printing process.

In an embodiment of the present invention, the process flow of the light guide plate manufacturing process is as follows:

(1) weighing red and green quantum dots according to a ratio of 1:8 to 1:16, respectively adding 3-4 ml of toluene into the red and green quantum dots for full dissolution, adding a quantum dot solution into the weighed printing ink with multiple scattering particles by using a liquid transfer gun after dissolution, adding magnetons into the printing ink, stirring and mixing the printing ink with a stirrer at a temperature of 50 ℃ and a rotation speed of 600 revolutions per minute for 2 and half hours until the toluene is uniformly stirred and the toluene evaporation viscosity is proper, and forming quantum dot slurry suitable for printing; dissolving quantum dots in a chlorobenzene solution, carrying out ultrasonic oscillation in a low-power ultrasonic instrument for 5-10 min to uniformly disperse the quantum dots, wherein the mass fraction of the quantum dots is 2wt%, filtering for standby application, then weighing UV glue with the refractive index of 1.48, adding chlorobenzene, and putting the quantum dot solution and the UV glue into two ink storage boxes of 3D printing equipment respectively, wherein the UV glue comprises an acrylate prepolymer, an active monomer and an ultraviolet initiator and accounts for 29.2wt% of the solution;

(2) simulating a light guide plate and bottom mesh points thereof by adopting a light guide plate made of PMMA (polymethyl methacrylate) or PC (polycarbonate), selecting matched mesh points and light guide plates, putting a manufactured printing screen plate on a screen plate fixing support, arranging a light guide plate support and a screen plate support on a crawler, aligning the positions, putting prepared quantum dot slurry in an ink box, descending the screen plate support to be attached to the light guide plate when the light guide plate is conveyed to a fixed position aligned and superposed with the screen plate through the crawler, spraying the quantum dot slurry onto the screen plate by a sprayer in the ink box at the moment, automatically moving a scraper down to the arranged position to carry out scraping screen plate printing after spraying, ascending the screen plate support after printing the mesh points, conveying the light guide plate to an oven by moving the crawler, and baking for 5 minutes at 50 ℃;

(3) the caterpillar band continuously conveys the light guide plate which is baked and dried to an automatic brightness meter, the light guide plate is placed on an automatic brightness meter detection support, the brightness meter moves on an upper slide rail, a lower slide rail, a left slide rail and a right slide rail to detect 18-point color coordinate values, and then the 18-point color coordinate values are input into a main control computer, and according to a chromaticity attenuation formula:

η=C-γ；γ=log_|ak|d_(x,y)

where γ is the actual measured color coordinate, C is the white light standard color coordinate, η is the color coordinate offset, d is_(x,y)In order to keep a distance from the LED lamp, a is changed according to the change of the size of the light guide plate, the k value influences the attenuation speed of the color coordinate, the larger k is, the more serious the color coordinate offset η is when the distance from the LED lamp is the same, and then the computer calculates the printing control k value according to the color coordinate offset value of the light guide plate measured by the 18-point method;

(4) attaching a first waterproof oxygen film to the bottom of the cuboid-shaped complementary color film mold, and setting the pulse frequency of the 3D printer according to the k value calculated by a main control computer:

k∝f

and f is printer frequency, the printing frequency f with large chromatic aberration is large, the spraying frequency f of the quantum dot solution is reduced along with the reduction of the k value, the spraying frequency of the UV adhesive is unchanged, then the quantum dot solution and the UV adhesive are simultaneously sprayed into the mold by a machine, the second water-resisting oxygen film is attached to the quantum dot ink after the spraying is finished, then the ultraviolet curing is carried out, then the mold is detached to obtain the manufactured complementary color film, and the light guide plate and the complementary color film are attached to each other.

Compared with the prior art, the invention has the following beneficial effects: the invention well improves the problem of the color difference at the near beam side of the screen printing dot light guide plate, optimizes the color compensation manufacturing technology of the screen printing dot light guide plate, fully realizes automatic production, can perform instant color compensation film printing manufacturing on light guide plates with different sizes, thicknesses and color differences, greatly reduces the color difference of the quantum dot screen printing light guide plate, and improves the liquid crystal display color gamut and product competitiveness.

Drawings

FIG. 1 is a flow chart of a method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate according to the present invention;

FIG. 2 is a production line of the quantum dot silk-screen light guide plate complementary color film manufacturing method of the invention;

FIG. 3 is a screen printing machine for manufacturing a complementary color film of a quantum dot silk-screen light guide plate according to the present invention;

FIG. 4 is a chromaticity attenuation detector of the method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate according to the present invention;

FIG. 5 is a 3D printer of a complementary color film of a quantum dot silk-screen light guide plate according to the method for manufacturing the complementary color film of the invention;

FIG. 6 is a light guide plate structure diagram of the quantum dot silk-screen light guide plate complementary color film manufacturing method of the present invention;

FIG. 7 is a cuboid mold of a complementary color film of a quantum dot silk-screen light guide plate complementary color film manufacturing method of the invention;

FIG. 8 is a complementary color film with quantum dot concentration variation manufactured by the quantum dot silk-screen light guide plate complementary color film manufacturing method of the present invention;

in the figure: 1-screen printing machine, 101-scraper, 102-slurry box, 103-quantum dot slurry nozzle, 104-screen plate support, 105-screen plate, 2-drying system, 3-clamping jaw mechanical arm, 4-automatic brightness detector, 401-brightness meter, 402-U type light guide plate support, 403-bidirectional slide rail, 5-grinding wheel mechanical arm, 6-3D printer, 601-quantum dot nozzle, 602-UV glue nozzle, 603-quantum dot solution box, 604-UV glue box, 605-printer complementary color film mold support slide rail, 7-light guide plate positioning frame, 8-light guide plate, 9-black box, 10-complementary color film cuboid mold, 11-complementary color film, 12-first waterproof oxygen film, 13-second waterproof oxygen film, 14-brightening film, 15-diffusion film, 16-reflection film and 7-LED lamp.

Detailed Description

The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.

The invention provides a method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate, which comprises the following steps of:

s1, preparing quantum dot slurry, printing the slurry on a light guide plate by a full-automatic screen printing method, forming mesh points of quantum dots on the light guide plate, and drying the mesh points in a drying system;

step S2, the dried light guide plate enters an automatic brightness detection instrument for color coordinate detection and recording, the recorded color coordinate value is input into a main control computer and is input into a chromaticity attenuation formula, and the k value is determined through computer calculation;

step S3, inputting the k value into a 3D printer by a computer, and after a first layer of waterproof oxygen film is attached to a complementary color film die below the 3D printer, changing the printing frequency f to print the complementary color film according to the obtained k value;

and step S4, after the color compensation film is printed successfully, a second layer of waterproof oxygen film is attached to carry out ultraviolet light curing, and then the light guide plate, the color compensation film, the brightness enhancement film and the diffusion film are attached in sequence.

The following is a specific implementation of the present invention.

A method for manufacturing a complementary color film of a quantum dot silk-screen light guide plate comprises the following steps:

step 1, preparing quantum dot slurry, printing the slurry on a light guide plate by using a full-automatic screen printing method to form a mesh point with quantum dots, and drying the mesh point in a drying system;

step 2, the dried light guide plate enters an automatic brightness detection instrument for color coordinate detection and recording, the recorded color coordinate value is input into a main control computer and substituted into a color coordinate deviation formula of η = C-gamma and gamma = log_|ak|d_(x,y)Determining the k value through computer calculation;

step 3, inputting the k value into a 3D printer by a computer, attaching a color complementing film die below the 3D printer to the first layer of waterproof oxygen film, and changing the printing frequency f to print the color complementing film according to the obtained k value;

step 4, attaching a second layer of waterproof oxygen film for ultraviolet light curing after the color complementing film is successfully printed, and then sequentially attaching a light guide plate, a color complementing film, a brightness enhancement film and a diffusion film;

in this embodiment, the ratio of the red and green quantum dots in step 1 is 1:8 to 1:16, the quantum dot light guide dot material may be selected from II-VI group compounds, may also be selected from III-V group compounds, may also be inorganic compounds, may also be organic compounds, and preferably is a silicon quantum dot, a germanium quantum dot, a cadmium sulfide quantum dot, a cadmium selenide quantum dot, a cadmium telluride quantum dot, a zinc selenide quantum dot, a lead sulfide quantum dot, a lead selenide quantum dot, an indium phosphide quantum dot, and an indium arsenide quantum dot material.

In this embodiment, in step 1, the thickness of the light guide plate is 0.5mm to 2mm, the light transmittance is about 92%, the used material is one or more of Polyethylene (PE), polypropylene (PP), polyethylene naphthalate (PEN), Polycarbonate (PC), polymethyl acrylate (PMA), and polymethyl methacrylate (PMMA), and the refractive index of the light guide plate material should be greater than the refractive index of air to satisfy the total reflection condition.

In this embodiment, the light guide plates with different sizes in step 1 have different dot densities and shapes, and the light guide plate and the bottom dots thereof are simulated according to the formula:

wherein N is the number of dots, r_(x,y)Is the dot size at (x, y), d²The grid area is represented, and the parameters of the light guide plate and the light source are both definite values, so a and b are both definite values, and the farther away from the light source, the larger the quantity of the mesh points, and the denser the mesh point distribution; the closer to the light source, the smaller the number of the dots, the more sparsely the dots are distributed, wherein the diameter of the quantum dot dots is 200-500 μm, the molar effect is avoided by adopting a randomly distributed array, and in order to obtain the optimal uniformity, the proper dots are selected to be matched with light guide plates of different sizes to automatically print light guide dots.

In this embodiment, in step 1, a full-automatic screen printer is used, a caterpillar belt with a fixed light guide plate is arranged below the screen printer to convey the light guide plate, a program is set by a main control computer to align the light guide plate on the caterpillar belt with a screen plate above the caterpillar belt, quantum dot ink is sprayed on an ink box in the screen printer according to the amount of the quantum dot ink, and then the quantum dot ink is printed on the light guide plate by a scraper.

In this embodiment, the automatic brightness detecting instrument in step 2 can measure the brightness color coordinate of the manufactured light guide plate by eighteen-point method, the brightness color coordinate is automatically input into the main control computer after the color coordinate measurement and recording, and the set program is substituted into the chromaticity attenuation formula

η=C-γ；γ=log_|ak|d_(x,y)

Calculating, wherein gamma is the actual measured color coordinate, C is the standard color coordinate of white light, η is the color coordinate offset, d_(x,y)In order to obtain the distance from the LED lamp, a is changed according to the change of the size of the light guide plate, the k value influences the attenuation speed of the color coordinate, the larger k is, the more serious the color coordinate offset η is when the distance from the LED lamp is the same, the control k value is obtained, the main control computer controls the printer frequency f through the k value, and the main control computer controls and coordinates the operation of the whole system in the system.

In this embodiment, the color compensation film in step 3 is a quantum dot film wrapped by an upper and a lower water-proof oxygen films, the water-proof oxygen film is one or more of a polyimide film, a PET film, a composite film with PET as a base material, a PMMA film or a polyvinyl alcohol film, the thickness of the water-proof oxygen film is 10 μm to 100 μm, the quantum dot material added in the color compensation film can be selected from II-VI compounds, III-V compounds, inorganic compounds or organic compounds, preferably silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots and indium arsenide quantum dot materials, the color compensation film is a rectangular film, and is cured into a film by adding infrared curing glue or ultraviolet curing glue, the film thickness is 100 μm to 200 μm, 120 μm to 220 μm or 150 μm to 240 μm.

In this embodiment, the brightness enhancement film in step 4 is composed of a multilayer optical film, and includes a first polymer layer and a second polymer layer, the material of the first polymer layer may be polyester, polycarbonate, polystyrene, styrene-acrylonitrile copolymer, cellulose acetate, polyethersulfone, polymethacrylate, polyurethane, polyvinyl chloride, polycycloolefin, polyimide, glass, or a combination or a blend thereof, the first polymer layer has a prism-shaped element array, the component of the first polymer layer is an ultraviolet light curing adhesive, and the total thickness of the brightness enhancement film is 75 μm.

In this embodiment, the diffusion film in step 4 is a high brightness diffusion sheet with a prism or microlens structure, and the scattering ion type wet particle coating and the surface microstructure type ultraviolet coating are printed on the film by a printing process.

In this embodiment, the light guide plate manufacturing process flow is as follows:

(1) weighing red and green quantum dots according to a ratio of 1:8 to 1:16, respectively adding 3-4 ml of toluene into the red and green quantum dots for full dissolution, adding a quantum dot solution into the weighed printing ink with multiple scattering particles by using a liquid transfer gun after dissolution, adding magnetons into the printing ink, stirring and mixing the printing ink with a stirrer at a temperature of 50 ℃ and a rotation speed of 600 revolutions per minute for 2 and half hours until the toluene is uniformly stirred and the toluene evaporation viscosity is proper, and forming the quantum dot slurry suitable for printing. Dissolving quantum dots in a chlorobenzene solution, carrying out ultrasonic oscillation for 5-10 min in a low-power ultrasonic instrument to uniformly disperse the quantum dots, wherein the mass fraction of the quantum dots is 2wt%, filtering for standby application, then weighing UV glue with the refractive index of 1.48, adding chlorobenzene, and putting the quantum dot solution and the UV glue into two ink storage boxes of 3D printing equipment respectively, wherein the UV glue comprises an acrylate prepolymer, an active monomer and an ultraviolet initiator and accounts for 29.2wt% of the solution.

(2) A light guide plate made of PMMA or PC simulates the light guide plate and the mesh points at the bottom of the light guide plate, selects proper mesh point distribution to be matched with light guide plates with different sizes, puts a manufactured printing screen plate on a screen plate fixing support, sets the alignment position of the light guide plate support on a crawler and the screen plate support, puts prepared quantum dot slurry in an ink box, when the light guide plate is conveyed to a fixed position aligned and superposed with the screen plate through the crawler, the screen plate support descends to be attached to the light guide plate, a sprayer in the ink box sprays the quantum dot slurry onto the screen plate, a scraper automatically moves downwards to the set position to carry out scraping screen printing after spraying is finished, the screen plate support ascends after the mesh point printing is finished, the crawler moves to convey the light guide plate to an oven, and the light guide plate is put into a.

(3) The caterpillar band continuously conveys the light guide plate which is baked and dried to an automatic brightness meter, the light guide plate is placed on an automatic brightness meter detection support, the brightness meter moves on an upper slide rail, a lower slide rail, a left slide rail and a right slide rail to detect 18-point color coordinate values, and then the 18-point color coordinate values are input into a main control computer, and according to a chromaticity attenuation formula:

η=C-γ；γ=log_|ak|d_(x,y)

where γ is the actual measured color coordinate, C is the white light standard color coordinate, η is the color coordinate offset, d is_(x,y)In order to obtain a distance from the LED lamp, a is changed according to the change of the size of the light guide plate, the k value affects the color coordinate attenuation speed, the larger k is, the more the color coordinate shift η is, the more the distance from the LED is, and then the computer calculates the printing control k value according to the color coordinate shift value of the light guide plate measured by the 18-point method.

(4) Attaching a first waterproof oxygen film to the bottom of the cuboid-shaped complementary color film mold, and setting the pulse frequency of the 3D printer according to the k value calculated by a main control computer:

k∝f

and f is printer frequency, the printing frequency f with large chromatic aberration is large, the spraying frequency f of the quantum dot solution is reduced along with the reduction of the k value, the spraying frequency of the UV adhesive is unchanged, then the quantum dot solution and the UV adhesive are simultaneously sprayed into the mold by a machine, the second water-resisting oxygen film is attached to the quantum dot ink after the spraying is finished, then the ultraviolet curing is carried out, then the mold is detached to obtain the manufactured complementary color film, and the light guide plate and the complementary color film are attached to each other.