Color filter film for an optical filter and preparation method thereof

Abstract

The present invention discloses a color filter film for an optical filter and a preparation method thereof, relating to the technical field of filter films. It sequentially includes a quantum dot layer, a color resist layer, and an ultraviolet absorption layer from bottom to top. The quantum dot layer is composed of quantum dots and a quantum transparent plastic film. The color resist layer is composed of pigments and a color resist transparent plastic film. The ultraviolet absorption layer is composed of ultraviolet absorbers and an ultraviolet transparent plastic film. The quantum dot layer and the color resist layer are connected by hot melting, and the color resist layer and the ultraviolet absorption layer are connected by thermal fusion. In the present invention, the quantum dot layer and the color resist layer, as well as the color resist layer and the ultraviolet absorption layer, are connected together by thermal fusion, and there is no obvious interface distinction between the layers, so that the number of emissions and refractions occurring when light passes through is small, thereby reducing the time for light to pass through the material and reducing the light damage generated by the collision of light with the material, so that the color filter film has high light transmittance.

Description

Technical Field

[0001] The present invention relates to the technical field of filter films, and specifically to a color filter film for an optical filter and a preparation method thereof. Background Art

[0002] An optical filter film is a light-transmitting film used in a screen that absorbs other colors in light and allows the three primary colors of light to pass through respectively. By controlling the proportion of the three primary colors passing through the three primary colors, different colors of light are displayed. The filter film is classified into a pigment filter film and a quantum dot filter film. The pigment filter film is formed by mixing pigments and glue, and the quantum dot filter film is formed by mixing quantum dots and glue. Light passing through quantum dots of different sizes can display different colors of light. The quantum dot filter film has the advantage of high light transmittance compared with the pigment filter film. However, the quantum dot filter film has the possibility of light leakage. In order to reduce the light leakage of the quantum dot filter film, generally, a pigment filter film is provided on one side of the quantum dot filter film to filter the leaked light again.

[0003] The defects of the existing filter films are as follows:

[0004] 1. Patent document KR100271487B1 discloses a transparent film for a color filter. In this patent, the donor film for a color filter significantly reduces the process of manufacturing a color filter by firing each coloring layer once. There are obvious interfaces between the layers of this patent. When light passes through this film, multiple reflections will occur between the interfaces, thereby increasing the number of collisions between light and the material, increasing the loss of light, and thus reducing the light transmittance. Therefore, a color filter film for an optical filter that can reduce the occurrence of interfaces between layers to reduce the number of light reflections is needed to solve this problem.

[0005] 2. Patent document KR1020120077666A discloses an optical film and a display filter. This patent discloses an optical film and a display filter including this optical film to prevent glare by having an antireflection function and a near-infrared absorption function in one film. It is difficult to ensure that the number of internal air holes in this optical film is at a low level. If there are many internal hole structures, the light passing through will be reflected multiple times at the hole interfaces, thereby causing collision losses between light and the medium, and thus causing a low light transmittance. Therefore, a color filter film for an optical filter that reduces the number of holes in the film is needed to solve this problem.

[0006] 3. Patent document JPH1010316A discloses a photosensitive film for color filters. This patent discloses that by using a laminated film composed of polyester and polyolefin film as the base film and laminating a photosensitive resin layer on the polyolefin film, it is easy to form patterns with slightly different levels. This film does not have the function of absorbing ultraviolet rays, and when applied to the screen, ultraviolet rays are likely to harm people's eyes. Therefore, a color filter film of an optical filter capable of absorbing ultraviolet rays is needed to solve this problem.

[0007] 4. Patent document CN104635370B discloses a color filter film and a color display including the color filter film. In this patent, interference can be enhanced at the viewing point, improving the brightness of the light at the viewing point, thereby increasing the transmittance of the color filter film and ultimately improving the light utilization rate of the color display. The surface of this filter film is uneven, and it is necessary to fabricate an uneven and regular structure on a tiny area, which makes the manufacturing process complex, with low efficiency and high cost. Therefore, a color filter film of an optical filter that can be fabricated simply, efficiently, and at low cost is needed to solve this problem. Summary of the Invention

[0008] An object of the present application is to provide a color filter film for an optical filter and a preparation method thereof, which can solve the technical problems raised in the prior art.

[0009] To achieve the above object, the present invention provides the following technical solution: A color filter film for an optical filter, which sequentially includes a quantum dot layer, a color resist layer, and an ultraviolet absorption layer from bottom to top. The quantum dot layer is composed of quantum dots and a quantum transparent plastic film. The color resist layer is composed of pigments and a color resist transparent plastic film. The ultraviolet absorption layer is composed of ultraviolet absorbers and an ultraviolet transparent plastic film. The quantum dot layer and the color resist layer are connected by heat fusion, and there is no obvious interface between the quantum dot layer and the color resist layer. The color resist layer and the ultraviolet absorption layer are connected by heat fusion, and there is no obvious interface between the color resist layer and the ultraviolet absorption layer.

[0010] Preferably, the quantum transparent plastic film, the color resist transparent plastic film, and the ultraviolet transparent plastic film are all polymethyl methacrylate films.

[0011] Preferably, the color resist layer includes 0.5 - 4 parts of pigments and 100 parts of color resist transparent plastic film by weight ratio.

[0012] Preferably, the pigment is one of the three pigments: red, green, and blue.

[0013] Preferably, the quantum dot layer includes 1 - 5 parts of quantum dots and 50 parts of quantum transparent plastic film by weight ratio.

[0014] Preferably, the quantum dots are one of indium phosphide quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, and cadmium telluride quantum dots in the core-shell quantum dots.

[0015] Preferably, the ultraviolet absorption layer comprises 0.5 to 5 parts by weight of an ultraviolet absorber and 100 parts of an ultraviolet transparent plastic film.

[0016] Preferably, the ultraviolet absorber is one of resorcinol monobenzoate, phenyl salicylate, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, and tris(1,2,2,6,6-pentamethylpiperidinyl) phosphite.

[0017] Preferably, the preparation method of the color filter film of the optical filter is as follows:

[0018] S01. Mix 1 to 5 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater, then heat to melt the polymethyl methacrylate material, and then stir to uniformly mix the quantum dots inside the polymethyl methacrylate material;

[0019] S02. Subsequently, put 0.5 to 4 parts of pigment and 100 parts of polymethyl methacrylate into the heating chamber of a second hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the pigment and polymethyl methacrylate evenly;

[0020] S03. Subsequently, put 0.5 to 5 parts of ultraviolet absorber and 100 parts of polymethyl methacrylate into the heating chamber of a third hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0021] S04. Subsequently, uniformly coat the molten polymethyl methacrylate on the inside of a transparent glass substrate frame with a baffle structure through a hot melt adhesive coater to form a 2-mm-thick quantum dot layer. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame to remelt the top surface layer of the polymethyl methacrylate film, and then uniformly coat the pigment and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer that has melted on the top to form a 0.5-mm-thick color resist layer, and then cool the color resist layer again;

[0022] S05. Then use the baking device to bake and melt the glue on the top surface layer of the color resist layer again, and then use the third hot melt adhesive coater to uniformly coat the mixture of ultraviolet absorber and polymethyl methacrylate on the top of the color resist layer to form a 0.5-mm-thick ultraviolet absorption layer.

[0023] Preferably, the following steps are further included in the S01:

[0024] S011. After stirring the polymethyl methacrylate material and the quantum dots, the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater is pressurized by a pressurized exhaust assembly, so that the gas inside the molten polymethyl methacrylate is extruded upward by the molten plastic and discharged through the pressurized exhaust assembly. The pressurized exhaust assembly includes a grid plate and a waterproof breathable membrane. The shape of the grid plate is determined according to the shape inside the heating chamber of the hot melt adhesive coater, and the periphery of the grid plate contacts the inner wall of the heating chamber of the hot melt adhesive coater. The waterproof breathable membrane is installed at the bottom of the grid plate.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In the present invention, the quantum dot layer, the color resist layer, and between the color resist and the ultraviolet absorption layer are connected together by thermal fusion, and there is no obvious interface distinction between the layers, so that the number of emissions and refractions that occur when light passes through is small, thereby reducing the time when light passes through the material, reducing the light damage caused by the collision of light with the material, and thus making the color filter film have high light transmittance, and making the color filter film of the optical filter have a reduced number of emissions and refractions when light passes through, thereby reducing the time when light passes through the material, reducing the light damage caused by the collision of light with the material, and thus making the color filter film have high light transmittance.

[0027] 2. The present invention combines quantum dots and a thin film, and reduces the number of bubbles and holes between the quantum dot layers through a pressurized exhaust assembly, thereby reducing the number of holes between the color filter films, thereby reducing the number of reflections of light at the interfaces of each hole, and further reducing the light loss caused by the collision of light with the material during multiple reflections, and further improving the transmittance. The color filter film of the optical filter reduces the number of bubbles and holes between the quantum dot layers through the pressurized exhaust assembly, thereby reducing the number of holes between the color filter films, and further reducing the light loss caused by the collision of light with the material during multiple reflections, and further improving the transmittance.

[0028] 3. The present invention can absorb the ultraviolet rays in the light passing through the color filter film by providing an ultraviolet absorption layer on the color resist layer in a molten bonding manner, thereby reducing the ultraviolet rays in the light, and further reducing the harm of ultraviolet light to people's eyes. The color filter film of the optical filter is provided with an ultraviolet absorption layer to absorb the ultraviolet rays in the light passing through the color filter film, thereby reducing the harm of ultraviolet light to people's eyes.

[0029] 4. In the present invention, the quantum dot layer, the color resistance layer, and the ultraviolet absorption layer are combined in a molten manner. While having high light transmittance compared to the bonding method between a relatively conventional quantum dot layer and a pigment filter layer, the production method and tools are simple, the production efficiency is high, and the cost is low. This makes the production method and tools for the color filter film of the optical filter also simple, with high production efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a front cross-sectional view of the present invention;

[0031] Figure 2 is a schematic structural diagram of the grid plate of the present invention;

[0032] Figure 3 is a flowchart of the preparation method of the present invention.

[0033] In the figure: 1. Quantum dot layer; 2. Color resistance layer; 3. Ultraviolet absorption layer; 4. Grid plate; 5. Permeable membrane. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Hereinafter, the technical solutions of the present invention will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] It sequentially includes a quantum dot layer 1, a color resistance layer 2, and an ultraviolet absorption layer 3 from bottom to top. The quantum dot layer 1 is composed of quantum dots and a quantum transparent plastic film. The color resistance layer 2 is composed of pigments and a color resistance transparent plastic film. The ultraviolet absorption layer 3 is composed of ultraviolet absorbers and an ultraviolet transparent plastic film. The quantum dot layer 1 and the color resistance layer 2 are connected by hot fusion, and there is no obvious interface between the quantum dot layer 1 and the color resistance layer 2. The color resistance layer 2 and the ultraviolet absorption layer 3 are connected by thermal fusion, and there is no obvious interface between the color resistance layer 2 and the ultraviolet absorption layer 3.

[0036] The quantum transparent plastic film, the color resistance transparent plastic film, and the ultraviolet transparent plastic film are all polymethyl methacrylate films.

[0037] The color resistance layer 2 includes 0.5 - 4 parts by weight of pigments and 100 parts by weight of the color resistance transparent plastic film.

[0038] The pigment is one of the three pigments: red, green, and blue.

[0039] The quantum dot layer 1 includes 1 - 5 parts by weight of quantum dots and 50 parts by weight of the quantum transparent plastic film.

[0040] The quantum dots are one of indium phosphide quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, and cadmium telluride quantum dots in the core-shell quantum dots.

[0041] The ultraviolet absorption layer 3 includes 0.5 to 5 parts by weight of an ultraviolet absorber and 100 parts of an ultraviolet transparent plastic film.

[0042] The ultraviolet absorber is one of resorcinol monobenzoate, phenyl salicylate, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, and tris(1,2,2,6,6-pentamethylpiperidinyl) phosphite.

[0043] The preparation method of the color filter film of the optical filter is as follows:

[0044] S01. Mix 1 to 5 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material, and then stir to uniformly mix the quantum dots inside the polymethyl methacrylate material;

[0045] S02. Subsequently, put 0.5 to 4 parts of pigments and 100 parts of polymethyl methacrylate into the heating chamber of the second hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the pigments and polymethyl methacrylate evenly;

[0046] S03. Subsequently, put 0.5 to 5 parts of ultraviolet absorber and 100 parts of polymethyl methacrylate into the heating chamber of the third hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0047] S04. Subsequently, uniformly coat the molten polymethyl methacrylate on the inside of a transparent glass substrate frame with a baffle structure through a hot melt adhesive coater to form a 2-mm-thick quantum dot layer 1. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame to remelt the top surface layer of the polymethyl methacrylate film. Subsequently, uniformly coat the pigments and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 whose top has melted to form a 0.5-mm-thick color resist layer 2, and then cool the color resist layer 2 again;

[0048] S05. Then use the baking device to bake and melt the glue on the top surface layer of the color resist layer 2 again. Subsequently, use the third hot melt adhesive coater to uniformly coat the ultraviolet absorber and polymethyl methacrylate mixture on the top of the color resist layer 2 to form a 0.5-mm-thick ultraviolet absorption layer 3.

[0049] In S01, the following steps are further included:

[0050] S011. After stirring the polymethyl methacrylate material and the quantum dots, use a pressurized exhaust assembly to pressurize the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is squeezed upward by the molten polymethyl methacrylate and discharged through the pressurized exhaust assembly. The pressurized exhaust assembly includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined according to the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4.

[0051] Example 1:

[0052] 1. Mix 1 part of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of the hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material, and then stir to evenly mix the quantum dots inside the polymethyl methacrylate material. Then use a pressurized exhaust assembly to pressurize the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is squeezed upward by the molten polymethyl methacrylate and discharged through the pressurized exhaust assembly. The pressurized exhaust assembly includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined according to the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4;

[0053] 2. Subsequently, put 1 part of pigment and 100 parts of polymethyl methacrylate into the second heating chamber of the hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the pigment and polymethyl methacrylate evenly;

[0054] 3. Subsequently, put 1 part of ultraviolet absorber and 100 parts of polymethyl methacrylate into the third heating chamber of the hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0055] 4. Subsequently, evenly coat the molten polymethyl methacrylate inside the transparent glass substrate frame with a baffle structure through the hot melt adhesive coater to form a 2 - mm - thick quantum dot layer 1. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame to melt the top surface layer of the polymethyl methacrylate film again. Then evenly coat the pigment and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 with the melted top to form a 0.5 - mm - thick color resist layer 2, and then cool the color resist layer 2 again;

[0056] V. Next, use a baking device to bake and melt the glue on the top surface of the color resist layer 2 again. Subsequently, use a third hot melt adhesive coater to evenly coat a mixture of ultraviolet absorber and polymethyl methacrylate on the top of the color resist layer 2 to form an ultraviolet absorption layer 3 with a thickness of 0.5 mm.

[0057] Example 2:

[0058] I. Mix 3 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material, and then stir to evenly mix the quantum dots inside the polymethyl methacrylate material. Then use a pressurized exhaust component to pressurize the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is squeezed upward by the molten polymethyl methacrylate and discharged through the pressurized exhaust component. The pressurized exhaust component includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined according to the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4;

[0059] II. Subsequently, put 1 part of pigment and 100 parts of polymethyl methacrylate into the heating chamber of a second hot melt adhesive coater, and heat to melt the polymethyl methacrylate. Then stir the pigment and polymethyl methacrylate evenly;

[0060] III. Subsequently, put 1 part of ultraviolet absorber and 100 parts of polymethyl methacrylate into the heating chamber of a third hot melt adhesive coater, and heat to melt the polymethyl methacrylate. Then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0061] IV. Subsequently, use a hot melt adhesive coater to evenly coat the molten polymethyl methacrylate inside a transparent glass substrate frame with a baffle structure to form a quantum dot layer 1 with a thickness of 2 mm. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame to melt the top surface layer of the polymethyl methacrylate film again. Subsequently, evenly coat the pigment and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 whose top has melted to form a color resist layer 2 with a thickness of 0.5 mm. Then cool the color resist layer 2 again;

[0062] V. Next, use a baking device to bake and melt the glue on the top surface of the color resist layer 2 again. Subsequently, use a third hot melt adhesive coater to evenly coat a mixture of ultraviolet absorber and polymethyl methacrylate on the top of the color resist layer 2 to form an ultraviolet absorption layer 3 with a thickness of 0.5 mm.

[0063] Example 3:

[0064] 1. Mix 5 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material. Next, stir to evenly mix the quantum dots inside the polymethyl methacrylate material. Then use a pressure and exhaust assembly to pressurize the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is extruded upward by the molten polymethyl methacrylate and discharged through the pressure and exhaust assembly. The pressure and exhaust assembly includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined according to the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4;

[0065] 2. Subsequently, put 1 part of pigment and 100 parts of polymethyl methacrylate into the second heating chamber of the hot melt adhesive coater and heat to melt the polymethyl methacrylate. Then stir the pigment and polymethyl methacrylate evenly;

[0066] 3. Subsequently, put 1 part of ultraviolet absorber and 100 parts of polymethyl methacrylate into the third heating chamber of the hot melt adhesive coater and heat to melt the polymethyl methacrylate. Then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0067] 4. Subsequently, evenly coat the molten polymethyl methacrylate inside the transparent glass substrate frame with a baffle structure through the hot melt adhesive coater to form a 2 - mm - thick quantum dot layer 1. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame to remelt the top surface layer of the polymethyl methacrylate film. Then evenly coat the pigment and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 whose top has melted to form a 0.5 - mm - thick color - resist layer 2. Then cool the color - resist layer 2 again;

[0068] 5. Then use the baking device to bake and melt the glue on the top surface layer of the color - resist layer 2 again. Then use the third hot melt adhesive coater to evenly coat the ultraviolet absorber and polymethyl methacrylate mixture on the top of the color - resist layer 2 to form a 0.5 - mm - thick ultraviolet absorption layer 3.

[0069] Example 4:

[0070] 1. Mix 3 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material. Next, stir to evenly mix the quantum dots inside the polymethyl methacrylate material. Then use a pressure - exhaust component to pressurize the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is squeezed upward by the molten polymethyl methacrylate and discharged through the pressure - exhaust component. The pressure - exhaust component includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined by the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4;

[0071] 2. Subsequently, put 2 parts of pigments and 100 parts of polymethyl methacrylate into the second heating chamber of the hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the pigments and polymethyl methacrylate evenly;

[0072] 3. Subsequently, put 1 part of ultraviolet absorber and 100 parts of polymethyl methacrylate into the third heating chamber of the hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0073] 4. Subsequently, evenly coat the molten polymethyl methacrylate inside the transparent glass substrate frame with a baffle structure through the hot melt adhesive coater to form a 2 - mm - thick quantum dot layer 1. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame to remelt the top surface layer of the polymethyl methacrylate film. Then evenly coat the pigments and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 whose top has melted to form a 0.5 - mm - thick color - resist layer 2, and then cool the color - resist layer 2 again;

[0074] 5. Then use the baking device to bake and melt the glue on the top surface layer of the color - resist layer 2 again. Subsequently, use the third hot melt adhesive coater to evenly coat the ultraviolet absorber and polymethyl methacrylate mixture on the top of the color - resist layer 2 to form a 0.5 - mm - thick ultraviolet absorption layer 3.

[0075] Example 5:

[0076] 1. Mix 3 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material. Next, stir to evenly mix the quantum dots inside the polymethyl methacrylate material. Then use a pressure exhaust assembly to pressurize the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is squeezed upward by the molten polymethyl methacrylate and discharged through the pressure exhaust assembly. The pressure exhaust assembly includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined according to the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4;

[0077] 2. Subsequently, put 3 parts of pigment and 100 parts of polymethyl methacrylate into the heating chamber of a second hot melt adhesive coater, and heat to melt the polymethyl methacrylate. Subsequently, stir the pigment and polymethyl methacrylate evenly;

[0078] 3. Subsequently, put 1 part of ultraviolet absorber and 100 parts of polymethyl methacrylate into the heating chamber of a third hot melt adhesive coater, and heat to melt the polymethyl methacrylate. Then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0079] 4. Subsequently, evenly coat the molten polymethyl methacrylate inside the transparent glass substrate frame with a baffle structure through the hot melt adhesive coater to form a 2 - mm - thick quantum dot layer 1. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame to melt the top surface layer of the polymethyl methacrylate film again. Subsequently, evenly coat the pigment and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 whose top has melted to form a 0.5 - mm - thick color - resist layer 2. Then cool the color - resist layer 2 again;

[0080] 5. Then use the baking device to bake and melt the glue on the top surface layer of the color - resist layer 2 again. Subsequently, use the third hot melt adhesive coater to evenly coat the ultraviolet absorber and polymethyl methacrylate mixture on the top of the color - resist layer 2 to form a 0.5 - mm - thick ultraviolet absorption layer 3.

[0081] Example Six:

[0082] 1. Mix 3 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material. Next, stir to evenly mix the quantum dots inside the polymethyl methacrylate material. Then use a pressure exhaust component to apply pressure to the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is squeezed upward by the molten polymethyl methacrylate and discharged through the pressure exhaust component. The pressure exhaust component includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined by the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4;

[0083] 2. Subsequently, put 1 part of pigment and 100 parts of polymethyl methacrylate into the second heating chamber of the hot melt adhesive coater and heat to melt the polymethyl methacrylate. Then stir the pigment and polymethyl methacrylate evenly;

[0084] 3. Subsequently, put 3 parts of ultraviolet absorber and 100 parts of polymethyl methacrylate into the third heating chamber of the hot melt adhesive coater and heat to melt the polymethyl methacrylate. Then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0085] 4. Subsequently, evenly coat the molten polymethyl methacrylate inside the transparent glass substrate frame with a baffle structure through the hot melt adhesive coater to form a 2 - mm - thick quantum dot layer 1. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame, so that the top surface layer of the polymethyl methacrylate film melts again. Then evenly coat the pigment and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 whose top has melted to form a 0.5 - mm - thick color - resistance layer 2. Then cool the color - resistance layer 2 again;

[0086] 5. Then use the baking device to bake and melt the glue on the top surface layer of the color - resistance layer 2 again. Then use the third hot melt adhesive coater to evenly coat the ultraviolet absorber and polymethyl methacrylate mixture on the top of the color - resistance layer 2 to form a 0.5 - mm - thick ultraviolet absorption layer 3.

[0087] Example 7:

[0088] 1. Mix 3 parts of quantum dots and 50 parts of polymethyl methacrylate material inside the heating chamber of a hot melt adhesive coater. Then heat to melt the polymethyl methacrylate material. Next, stir to evenly mix the quantum dots inside the polymethyl methacrylate material. Then use a pressure exhaust assembly to pressurize the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater, so that the gas inside the molten polymethyl methacrylate is squeezed upward by the molten polymethyl methacrylate and discharged through the pressure exhaust assembly. The pressure exhaust assembly includes a grid plate 4 and a waterproof breathable membrane 5. The shape of the grid plate 4 is determined according to the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate 4 contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane 5 is installed at the bottom of the grid plate 4;

[0089] 2. Subsequently, put 1 part of pigment and 100 parts of polymethyl methacrylate into the heating chamber of the second hot melt adhesive coater, and heat to melt the polymethyl methacrylate. Subsequently, stir the pigment and polymethyl methacrylate evenly;

[0090] 3. Then put 5 parts of ultraviolet absorber and 100 parts of polymethyl methacrylate into the heating chamber of the third hot melt adhesive coater, and heat to melt the polymethyl methacrylate. Then stir the ultraviolet absorber and polymethyl methacrylate evenly;

[0091] 4. Subsequently, evenly coat the molten polymethyl methacrylate on the inside of a transparent glass substrate frame with a baffle structure through a hot melt adhesive coater to form a 2 - mm - thick quantum dot layer 1. After cooling, use a baking device to heat the top of the polymethyl methacrylate film inside the transparent glass substrate frame, so that the top surface layer of the polymethyl methacrylate film melts again. Subsequently, evenly coat the pigment and polymethyl methacrylate inside the second hot melt adhesive coater on the top of the quantum dot layer 1 whose top has melted to form a 0.5 - mm - thick color resist layer 2. Then cool the color resist layer 2 again;

[0092] 5. Then use the baking device to bake and melt the glue on the top surface layer of the color resist layer 2 again. Subsequently, use the third hot melt adhesive coater to evenly coat the ultraviolet absorber and polymethyl methacrylate mixture on the top of the color resist layer 2 to form a 0.5 - mm - thick ultraviolet absorption layer 3.

[0093] Performance testing:

[0094] 1. Transmittance test: Place the products of different embodiments in a transmittance tester slot to measure the transmittance.

[0095] 2. Ultraviolet intensity detection: Use a blue - light LED backlight to irradiate the color filter film product from bottom to top, and use an ultraviolet radiation illuminometer to detect the ultraviolet intensity of the light - transmitting product from above.

[0096] Table 1 Test data sheet of the light transmittance test of the color filter film measured by a light transmittance tester and the ultraviolet intensity detection test measured by an ultraviolet irradiance meter

[0097]

[0098]

[0099] As can be seen from Table 1, within the content range of the quantum dots in the filter film in the examples, when the proportion increases, the light transmittance will decrease accordingly. Within the content range of the pigment, when the proportion of the pigment increases, the light transmittance will decrease. Within the content range of the ultraviolet absorber, when the content of the ultraviolet absorber increases, the light transmittance will decrease, and at the same time, the ultraviolet absorption ability will increase. Compared with the traditional pigment color filter film, it has a high light transmittance and a strong ultraviolet absorption ability.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A color filter film for an optical filter, characterized in that: It sequentially includes a quantum dot layer (1), a color resist layer (2), and an ultraviolet absorption layer (3) from bottom to top. The quantum dot layer (1) is composed of quantum dots and a quantum transparent plastic film. The color resist layer (2) is composed of pigments and a color resist transparent plastic film. The ultraviolet absorption layer (3) is composed of an ultraviolet absorber and an ultraviolet transparent plastic film. The quantum dot layer (1) and the color resist layer (2) are connected by hot melting. There is no obvious interface between the quantum dot layer (1) and the color resist layer (2). The color resist layer (2) and the ultraviolet absorption layer (3) are connected by thermal fusion. There is no obvious interface between the color resist layer (2) and the ultraviolet absorption layer (3); The quantum transparent plastic film, the color resist transparent plastic film, and the ultraviolet transparent plastic film are all polymethyl methacrylate films; After stirring the polymethyl methacrylate material and the quantum dots, the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater is pressurized by a pressure exhaust assembly, so that the gas inside the molten polymethyl methacrylate is extruded upward by the molten polymethyl methacrylate and discharged through the pressure exhaust assembly.

2. The color filter film of the optical filter according to claim 1, characterized in that: The color resist layer (2) includes 0.5 to 4 parts by weight of pigments and 100 parts by weight of the color resist transparent plastic film.

3. The color filter film of the optical filter according to claim 2, wherein: The pigment is one of the three pigments of red, green, and blue.

4. The color filter film of the optical filter according to claim 1, characterized in that: The quantum dot layer (1) includes 1 to 5 parts by weight of quantum dots and 50 parts by weight of the quantum transparent plastic film.

5. The color filter film of the optical filter according to claim 4, wherein: The quantum dot is one of indium phosphide quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, and cadmium telluride quantum dots in core-shell quantum dots.

6. The color filter film of an optical filter according to claim 1, wherein: The ultraviolet absorption layer (3) includes 0.5 to 5 parts by weight of an ultraviolet absorber and 100 parts by weight of the ultraviolet transparent plastic film.

7. The color filter film of an optical filter according to claim 6, wherein: The ultraviolet absorber is one of resorcinol monobenzoate, phenyl salicylate, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, and tris(1,2,2,6,6-pentamethylpiperidinyl) phosphite.

8. A method for preparing a color filter film of an optical filter according to any one of claims 1-7, characterized in that: The preparation method of the color filter film of the optical filter is as follows: S01: Mix 1 to 5 parts by weight of quantum dots and 50 parts by weight of polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater. Then heat to melt the polymethyl methacrylate, and then stir to uniformly mix the quantum dots inside the polymethyl methacrylate; S02: Subsequently, put 0.5 to 4 parts by weight of pigments and 100 parts by weight of polymethyl methacrylate into the heating chamber of the second hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the pigments and the polymethyl methacrylate evenly; S03: Subsequently, put 0.5 to 5 parts by weight of an ultraviolet absorber and 100 parts by weight of polymethyl methacrylate into the heating chamber of the third hot melt adhesive coater, heat to melt the polymethyl methacrylate, and then stir the ultraviolet absorber and the polymethyl methacrylate evenly; S04. Subsequently, the molten polymethyl methacrylate is evenly coated inside the transparent glass substrate frame with a baffle structure by a hot melt adhesive coater to form a 2-mm-thick quantum dot layer (1). After cooling, the top of the polymethyl methacrylate film inside the transparent glass substrate frame is heated by a baking device to remelt the top surface layer of the polymethyl methacrylate film. Subsequently, the pigment and polymethyl methacrylate inside the second hot melt adhesive coater are evenly coated on the top of the quantum dot layer (1) with the top melted to form a 0.5-mm-thick color resist layer (2), and then the color resist layer (2) is cooled again. S05. Then, the baking device is used to bake and melt the glue on the top surface layer of the color resist layer (2) again. Subsequently, a mixture of an ultraviolet absorber and polymethyl methacrylate is evenly coated on the top of the color resist layer (2) by a third hot melt adhesive coater to form a 0.5-mm-thick ultraviolet absorber layer (3).

9. The method for preparing a color filter film of an optical filter according to claim 8, characterized in that: In the S01, the following steps are further included: S011. After stirring the polymethyl methacrylate material and the quantum dots, the top of the molten polymethyl methacrylate inside the heating chamber of the hot melt adhesive coater is pressurized by a pressure-exhausting assembly, so that the gas inside the molten polymethyl methacrylate is extruded upward by the molten polymethyl methacrylate and discharged through the pressure-exhausting assembly. The pressure-exhausting assembly includes a grid plate (4) and a waterproof breathable membrane (5). The shape of the grid plate (4) is determined according to the shape inside the heating chamber of the hot melt adhesive coater. The periphery of the grid plate (4) contacts the inner wall of the heating chamber of the hot melt adhesive coater, and the waterproof breathable membrane (5) is installed at the bottom of the grid plate (4).

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