Brightness enhancement film liquid crystal panel matching method and brightness enhancement film dip dyeing process

Abstract

The invention relates to a brightness enhancement film liquid crystal panel matching method and a brightness enhancement film dip dyeing process, belongs to the technical field of polaroid manufacturing, and provides a novel polaroid production process which is simple in procedure, PVA adsorbing iodine molecules is attached to the surface of a film material in a plating method, and when the film material is produced, the molecule alignment process is completed, so that the production efficiency is improved. And the dip dyeing section does not need additional extension, so that the unstable factor that the film is broken when the traditional polyvinyl alcohol film is stretched and extended is avoided. According to the polarizer provided by the utility model, the polarizer production requirement of 130 inches to the maximum can be met, and meanwhile, due to the clamping effect of the reflection of the prism film, the utilization efficiency of an LED light backlight source is maximized, and the power consumption of the backlight is effectively reduced. In addition, the upper and lower polarizers provided by the invention are applied to the aspect of panel bias pasting, dark-state pictures are more uniform, large-viewing-angle light leakage is avoided, and the contrast value can be obviously improved.

Description

Technical Field

[0001] The invention relates to polarizer manufacturing, and in particular to a brightness enhancement film liquid crystal panel matching method and a brightness enhancement film immersion dyeing process. Background Art

[0002] LCD (Liquid Crystal Display) is a liquid crystal display, which has upper and lower polarizing films attached to the front and back of the liquid crystal panel. It polarizes the light from the backlight source and is an important component of the display device.

[0003] With the development of technology, the progress of broadband, and the upgrading of mobile displays, the market has put forward the demand for brighter and clearer displays, stimulating the continuous development of new brightness enhancement technologies.

[0004] In traditional display devices, the light emitted by the backlight source is refracted, reflected and absorbed by multiple layers of materials, and the light intensity reaching the observer's eyes will be greatly lost. In order to efficiently utilize the light source, various manufacturers have invested resources in research and development in terms of increasing the light source intensity and improving the light transmittance.

[0005] DualBrightness Enhancement Film, hereinafter referred to as brightness enhancement, is a new type of optical film born with the rise of liquid crystal displays. It is a special film with multi-layer film deposited by 3M and is widely used in consumer electronics, communications and mobile office. Its birth solves the problems of low light utilization, high energy consumption and low display brightness of liquid crystal displays, and increases the display utilization of LCD from light guide plate to final from less than 10% at the beginning to more than 90% now. Using micro-complex technology and thin film technology, a precise acrylic resin prism structure is formed on the polyester surface, in which optical materials with different refractive indices are stacked. Through the total reflection recovery mechanism of light, the non-polarized light output by the backlight source is reused, and the non-polarized light that is not absorbed by the dichroic absorption type polarizer is recycled and reused by the backlight module to achieve a comprehensive brightness enhancement effect, with an efficiency of up to 1.6 times the brightness enhancement.

[0006] However, in the production process of the brightness enhancement film, the dipping section needs to be extended additionally, which can easily lead to film breakage during the extension. Therefore, a brightness enhancement film dipping process and a liquid crystal panel matching method are proposed to solve the above problem. Summary of the invention

[0007] The present invention overcomes the shortcomings of the prior art and provides a brightness enhancement film immersion dyeing process and a liquid crystal panel matching method thereof.

[0008] To achieve the above object, the technical solution adopted by the present invention is: a method for matching a brightness enhancement film liquid crystal panel, comprising: a liquid crystal panel and an upper polarizer arranged on one side of the liquid crystal panel and a lower polarizer arranged on the other side of the liquid crystal panel;

[0009] The upper polarizer is made by attaching an iodine-based upper polarizer and a phase difference adjustment film, and the lower polarizer is made by compositely attaching a brightness enhancement film and a TAC film or a single brightness enhancement film.

[0010] The brightness enhancement film comprises a PVA coating, a substrate, a brightness enhancement reflective layer and a protective film which are laminated in sequence. The PVA coating is arranged at an end close to the liquid crystal panel, and the protective film is arranged at an end far from the liquid crystal panel.

[0011] In a preferred embodiment of the present invention, the brightness enhancement film PVA coating is prepared by copolymerization of polyvinyl alcohol monomer or modified PVA polymer monomer, and the thickness of the polyvinyl alcohol coating is 2-7 μm.

[0012] In a preferred embodiment of the present invention, in order to optimize the immersion color and the panel quality, the thickness of the polyvinyl alcohol coating is 4-6 μm.

[0013] In a preferred embodiment of the present invention, the substrate type is a homopolymer or copolymer that is insoluble or poorly soluble in water, and the substrate type can also be a mixture of the homopolymer and the copolymer.

[0014] In a preferred embodiment of the present invention, the substrate material is one of syndiotactic or isotactic polyethylene resin, styrene block copolymer, polyvinyl chloride polyurethane, cellulose resin, or a mixture of two or more thereof.

[0015] In a preferred embodiment of the present invention, the thickness of the substrate itself is 30-90 μm, or 30-40 μm.

[0016] In a preferred embodiment of the present invention, a plurality of prism pits are etched on the surface of the brightening reflective layer, and the prism pits can satisfy the requirement that light with an incident angle within ±35° in the normal direction is refracted and guided out, and the spacing between the plurality of prism pits is 20 to 60 μm.

[0017] In a preferred embodiment of the present invention, the prism resin material can be selected from one of polyesters, acrylates, or a material that is transparent, low-absorbent, and strong. In order to maximize the utilization of the light source, the prism angle can be selected from 80 to 95°.

[0018] In a preferred embodiment of the present invention, the protective film is made of polyethylene terephthalate, polypropylene resin, and polypropylene resin bonded together by electrostatic adsorption, and the bonding thickness is 40 to 50 μm.

[0019] In a preferred embodiment of the present invention, the bonding method can be electrostatic adsorption or polyacrylate pressure-sensitive adhesive. Electrostatic adsorption can be used for the purpose of optimizing the peeling performance and bonding stability.

[0020] A brightness enhancement film dip-dyeing process, including a brightness enhancement film liquid crystal panel, the specific process is as follows;

[0021] Washing: The brightening film is rolled out by the unwinding mechanism, with the PVA coated surface inside the roll and the non-PVA surface outside the roll;

[0022] Dyeing: The cleaned brightening film is placed in a dyeing tank for dyeing. The dyeing tank contains a mixed solution of iodine solution, boric acid, and iodine ions. The iodine element and iodine ions serve as dichroic media and adhere to the surface of the PVA coating of the film material.

[0023] The mass concentration of elemental iodine in the dyeing tank is 0.2-1.0%, the concentration of boric acid is 4-8%, the dyeing time is 600-1000 seconds, and the temperature is 20-60°C;

[0024] Cleaning and drying: After dyeing, the membrane flows through a glass knife that can cut water and scrape off residual liquid to clean the residual liquid and impurities on the surface of the membrane. Then the cleaned membrane flows through an oven to dry the water and stabilize the color.

[0025] Glue coating: The cleaned and dried film material is coated with a pressure-sensitive adhesive (PSA) glue which is mixed and stirred with an acrylate main agent (solid content 18-45%) and additives (0.001-1% curing agent, 0.01-1% antistatic agent) and left to stand for degassing. The glue is supplied to a coating mechanism through a pressure of (3-10kg) and a quantitative pump and coated on the release agent surface of a release film (19-50μm thickness). The glue is passed through a gradient temperature oven (50-150℃). Under the action of the heat in the oven, the solvent absorbs heat and evaporates, and the hardener and the main agent form a hinge effect to form a polymer adhesive layer. The baking time is 1-3min. After drying, the glue is bonded to the brightening rubber wheel after trimming and is rolled up by a film-rewinding mechanism.

[0026] In a preferred embodiment of the present invention, the infection process also includes a PSA glue aging process: after the glue is coated, an aging process is further set, wherein the temperature range is 20 to 55° C., the humidity range is set to 40 to 80%, and the aging time is 24 to 168 hours.

[0027] In a preferred embodiment of the present invention, the oven is of clamshell type and is arranged as three sections of equal length, the temperature range is 50-70° C., and the total residence time of the film material in the oven is 150-240 s.

[0028] In a preferred embodiment of the present invention, in the dyeing step, the liquid level ensures that the non-PVA coated surface is immersed in the aqueous solution, and the glass knife is located on the PVA coated surface, and the material can be stainless steel or ordinary inorganic non-metallic glass material; the contact surface between the glass knife and the PVA is an arc guide angle of 0.1 to 1.0°, preferably 0.6°; the angle between the glass knife and the surface of the film material flowing through is 10 to 30°, the preferred angle is 15° to 20°, and further preferably 16°.

[0029] In a preferred embodiment of the present invention, in the gluing step, the PVA coating layer is subjected to surface activation treatment, and the treatment method may be one of corona treatment, plasma, glow discharge treatment, flame treatment, UV ozone treatment, or an alkali treatment, ultrasonic treatment with solvents such as water acetone, etc.

[0030] In a preferred embodiment of the present invention, the product is left to stand at room temperature for 10 to 12 hours after aging before the subsequent processing steps are performed.

[0031] In a preferred embodiment of the present invention, the phase difference adjustment film is a composite multilayer film having resin A and resin B, wherein resin A is a thermoplastic resin polymer having a positive intrinsic birefringence value, and resin B is a thermoplastic resin polymer having a negative intrinsic birefringence value.

[0032] In a preferred embodiment of the present invention, the brightness enhancement film and the protective film can be bonded together using a water-based adhesive, an active energy ray-curing adhesive, a thermosetting adhesive or a pressure-sensitive adhesive. Considering the bonding effect and the weathering stability after exposure to the conditions, the preferred options are water-based adhesives, active energy ray-curing adhesives and pressure-sensitive adhesives.

[0033] In a preferred embodiment of the present invention, the resin A layer has a slow axis, and the slow axis of the resin layer B is substantially perpendicular. Specifically, the slow axis angles of the resin layer A and the resin layer B are in a specific range close to 90°. The R0 and Rth of the phase difference adjustment film can optimize the panel taste, preferably in the range of 89 to 92°.

[0034] In a preferred embodiment of the present invention, in order to achieve an ideal range of R0 and Rth, the total overlapping degree of the resin A layer and the resin B layer is 10 to 100 μm, preferably 50 to 80 μm, and there is no special restriction on the thickness of each layer of the resin layer A and the resin layer B. The preferred thickness of each layer is 10 to 30 μm. A particularly preferred solution is to mix them with each other, and the finished film material satisfies the in-plane phase difference Re of 40 to 70 nm, preferably between 50 and 55 nm, and satisfies Rth of 200 to 300 nm in the thickness direction.

[0035] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0036] (1) The present invention is different from the traditional polarizer manufacturing method and provides a new process flow with streamlined procedures. The PVA adsorbed with iodine molecules is attached to the surface of the film material by coating, and the molecular alignment process is completed when the film material is produced. The dipping process does not need to be extended additionally, thus avoiding the unstable factor of film breakage during the traditional polyvinyl alcohol film stretching.

[0037] (2) The original film of the present invention adopts a lateral stretching process, which can meet the production demand of polarizers with a maximum width of 130, breaking the limitation of the width of the traditional iodine-based polarizer lower film due to the ultra-large size of the cutting film. At the same time, due to the reflection effect of the prism film itself, the LED light efficiency utilization of the backlight source is maximized.

[0038] (3) When the polarizer produced by the process of the present invention is used in panels, it is matched with a special phase difference film to make the dark state of the picture more uniform, and the light leakage at a large viewing angle is significantly improved, the contrast value is also significantly improved, and at the same time, the utilization of the light source is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of the brightness enhancement film material used in the preferred embodiment of the present invention;

[0040] Figure 2 This is a production process diagram of the upper and lower polarizers of the preferred embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the polarizing plate laminating mechanism and unwinding position in the preferred embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the polarizer laminating mechanism and unwinding position in the preferred embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of a preferred structural composition scheme of the upper and lower polarizers attached to a liquid crystal panel according to the present invention. DETAILED DESCRIPTION

[0044] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0046] like Figure 1-5As shown, a brightness enhancement film liquid crystal panel matching method includes: a brightness enhancement film dip-dyeing process and a liquid crystal panel matching method thereof, including: a liquid crystal panel and an upper polarizer disposed on one side of the liquid crystal panel and a lower polarizer disposed on the other side of the liquid crystal panel;

[0047] The upper polarizer is made by attaching an iodine-based upper polarizer and a phase difference adjustment film, and the lower polarizer is made by compositely attaching a brightness enhancement film and a TAC film or by attaching a single brightness enhancement film.

[0048] The brightness enhancement film is a brightness enhancement polarizing film, and the brightness enhancement film is formed by laminating a PVA coating, a substrate, a brightness enhancement reflective layer and a protective film in sequence from top to bottom.

[0049] In a preferred embodiment of the present invention, the brightness enhancement film PVA coating is prepared by copolymerization of polyvinyl alcohol monomer or modified PVA polymer monomer, and the thickness of the polyvinyl alcohol coating is 2-7 μm.

[0050] In a preferred embodiment of the present invention, in order to optimize the immersion color and the panel quality, the thickness of the polyvinyl alcohol coating is 4-6 μm.

[0051] In a preferred embodiment of the present invention, the substrate type is a homopolymer or copolymer that is insoluble or poorly soluble in water, and the substrate type can also be a mixture of the homopolymer and the copolymer.

[0052] In a preferred embodiment of the present invention, the substrate material is one of syndiotactic or isotactic polyethylene resin, styrene block copolymer, polyvinyl chloride polyurethane, cellulose resin, or a mixture of two or more thereof.

[0053] In a preferred embodiment of the present invention, the thickness of the substrate itself is 30-90 μm, or 30-40 μm.

[0054] In a preferred embodiment of the present invention, a plurality of prism pits are etched on the surface of the brightening reflective layer, and the prism pits can satisfy the requirement that light with an incident angle within ±35° in the normal direction is refracted and guided out, and the spacing between the plurality of prism pits is 20 to 60 μm.

[0055] In a preferred embodiment of the present invention, the prism resin material can be selected from one of polyesters, acrylates, or a material that is transparent, low-absorbent, and strong. In order to maximize the utilization of the light source, the prism angle can be selected from 80 to 95°.

[0056] In a preferred embodiment of the present invention, the protective film is made of polyethylene terephthalate, polypropylene resin, and polypropylene resin bonded together by electrostatic adsorption, and the bonding thickness is 40 to 50 μm.

[0057] In a preferred embodiment of the present invention, the bonding method can be electrostatic adsorption or polyacrylate pressure-sensitive adhesive. Electrostatic adsorption can be used for the purpose of optimizing the peeling performance and bonding stability.

[0058] A brightness enhancement film dip-dyeing process, including a brightness enhancement film liquid crystal panel, the specific process is as follows;

[0059] Washing: The brightening film is rolled out by the unwinding mechanism, with the PVA coating layer inside the roll and the non-PVA layer outside the roll; Dyeing: The cleaned brightening film is placed in a dyeing tank for dyeing, wherein a mixed solution of iodine solution, boric acid and iodine ions is contained in the dyeing tank, and the iodine element and iodine ions are used as dichroic media and attached to the surface of the PVA coating of the film material;

[0060] The mass concentration of elemental iodine in the dyeing tank is 0.2-1.0%, the concentration of boric acid is 4-8%, the dyeing time is 600-1000 seconds, and the temperature is 20-60°C;

[0061] Cleaning and drying: After dyeing, the membrane flows through a glass knife that can cut water and scrape off residual liquid to clean the residual liquid and impurities on the surface of the membrane. Then the cleaned membrane flows through an oven to dry the water and stabilize the color.

[0062] Glue coating: The cleaned and dried film material is coated with a pressure-sensitive adhesive (PSA) glue which is mixed and stirred with an acrylate main agent (solid content 18-45%) and additives (0.001-1% curing agent, 0.01-1% antistatic agent) and left to stand for degassing. The glue is supplied to a coating mechanism through a pressure of (3-10kg) and a quantitative pump and coated on the release agent surface of a release film (19-50μm thickness). The glue is passed through a gradient temperature oven (50-150℃). Under the action of the heat in the oven, the solvent absorbs heat and evaporates, and the hardener and the main agent form a hinge effect to form a polymer adhesive layer. The baking time is 1-3min. After drying, the glue is bonded to the brightening rubber wheel after trimming and is rolled up by a film-rewinding mechanism.

[0063] In a preferred embodiment of the present invention, the specific process also includes a PSA glue aging process: after the glue is coated, an aging process is further set, wherein the temperature range is 20 to 55° C., the humidity range is set to 40 to 80%, and the aging time is 24 to 168 hours.

[0064] In a preferred embodiment of the present invention, the oven is of clamshell type and is arranged as three sections of equal length, the temperature range is 50-70° C., and the total residence time of the film material in the oven is 150-240 s.

[0065] In a preferred embodiment of the present invention, in the dyeing step, the liquid level ensures that the non-PVA coated surface is immersed in the aqueous solution, and the glass knife is located on the PVA coated surface, and the material can be stainless steel or ordinary inorganic non-metallic glass material; the contact surface between the glass knife and the PVA is an arc guide angle of 0.1 to 1.0°, preferably 0.6°; the angle between the glass knife and the surface of the film material flowing through is 10 to 30°, the preferred angle is 15° to 20°, and further preferably 16°.

[0066] In a preferred embodiment of the present invention, in the gluing step, the PVA coating layer is subjected to surface activation treatment, and the treatment method may be one of corona treatment, plasma, glow discharge treatment, flame treatment, UV ozone treatment, or an alkali treatment, ultrasonic treatment with solvents such as water acetone, etc.

[0067] In a preferred embodiment of the present invention, the product is left to stand at room temperature for 10 to 12 hours after aging before the subsequent processing steps are performed.

[0068] In a preferred embodiment of the present invention, the phase difference adjustment film is a composite multilayer film having resin A and resin B, wherein resin A is a thermoplastic resin polymer having a positive intrinsic birefringence value, and resin B is a thermoplastic resin polymer having a negative intrinsic birefringence value.

[0069] In a preferred embodiment of the present invention, the brightness enhancement film and the protective film can be bonded together using a water-based adhesive, an active energy ray-curing adhesive, a thermosetting adhesive or a pressure-sensitive adhesive. Considering the bonding effect and the weathering stability after exposure to the conditions, the preferred options are water-based adhesives, active energy ray-curing adhesives and pressure-sensitive adhesives.

[0070] In a preferred embodiment of the present invention, the resin A layer has a slow axis, and the slow axis of the resin layer B is substantially perpendicular. Specifically, the slow axis angles of the resin layer A and the resin layer B are in a specific range close to 90°. The R0 and Rth of the phase difference adjustment film can optimize the panel taste, preferably in the range of 89 to 92°.

[0071] In a preferred embodiment of the present invention, in order to achieve an ideal range of R0 and Rth, the total overlapping degree of the resin A layer and the resin B layer is 10 to 100 μm, preferably 50 to 80 μm, and there is no special restriction on the thickness of each layer of the resin layer A and the resin layer B. The preferred thickness of each layer is 10 to 30 μm. A particularly preferred solution is to mix them with each other, and the finished film material satisfies the in-plane phase difference Re of 40 to 70 nm, preferably between 50 and 55 nm, and satisfies Rth of 200 to 300 nm in the thickness direction.

[0072] The following is further described with reference to the embodiments.

[0073] Example 1

[0074] (1) Brightening and dyeing process

[0075] S1 swelling: The brightening film is rolled out by the unwinding mechanism, with the PVA coating layer inside the roll and the protective film surface outside the roll on the air side, and then put into the pure water tank for cleaning and soaking.

[0076] S2 dyeing: After cleaning, the brightening film is placed in a dyeing tank for dyeing. The dyeing tank contains a mixture of iodine solution, boric acid and iodine ions, so that the iodine element and iodine ions act as dichroic media and adhere to the film material on the surface of the PVA coating, so that the brightening film has a preliminary polarizing effect. In the dyeing tank of this embodiment, the mass concentration of elemental iodine is 0.3%, the concentration of boric acid is 4%, the dyeing time is 800 seconds, and the temperature is 50°C.

[0077] S3 Water washing: After dyeing, the membrane passes through a glass knife that can cut water and scrape off residual liquid to clean the residual liquid and impurities on the surface of the membrane. In this embodiment, stainless steel is used, and the contact surface between the glass knife and PVA has an arc angle of 0.6; the angle between the glass knife and the surface of the membrane flowing through is 16°.

[0078] S4 Drying: After the cleaned film is impregnated, it flows through an oven and passes through three segmented clamshell ovens of equal length. The temperature range is set at 50-70°C, and the further temperature is 65°C. The total residence time of the film in the oven is 180s. After the baking is completed, the brightening impregnation process is completed and the finished product is rolled up.

[0079] S5 Glue coating: The impregnated film material is subjected to surface corona activation treatment on the PVA coating layer. Then, the treated film surface is coated with PSA glue, which is a mixture of 18% solid content of acrylic ester main agent, 0.001 curing agent and 0.05% antistatic agent, and then stirred and left to stand for degassing. It is supplied to the coating mechanism through 5kg pressure and a quantitative pump and coated on the release agent surface of the release film. After being placed in a gradient (50-150℃) temperature oven, the solvent absorbs heat and evaporates under the action of the heat in the oven, and the hardener and the main agent form a hinge effect to form a polymer adhesive layer. The baking time is 3 minutes. After drying, it is bonded to the brightening film through a trimming rubber wheel and rolled up by the film collection mechanism.

[0080] S6 PSA glue aging process: Brightening after glue coating, in an environment of 45℃ and 50% humidity, aging time is 72h, then pulled to room temperature and left to stand for 10h to obtain a semi-finished product.

[0081] (2) Protective film coating

[0082] You can choose Fuji's TAC film ("TG60UL" manufactured by FUJIFILM Corporation) and attach it to the PVA coating side to protect the polarized PVA surface. The adhesive is PSA glue, and the process flow of glue coating and release film is the same as above.

[0083] (3) Brightness enhancement film and protective film bonding

[0084] The brightening and protective TAC films coated with PSA glue are passed through the film tearing and rolling laminating device, and the brightening and TAC films are laminated as a whole to be used as the lower polarizer of the panel. The film unwinding position is referred to Figure 3 .

[0085] (4) Conventional iodine-based film preparation

[0086] Referring to the polyvinyl alcohol ester thin impregnation process of patent CN108693589A, the polyethylene resin film is immersed in water to obtain a traditional iodine-based polarizer upper film, and the PSA glue coating process is simultaneously carried out to obtain a semi-finished product.

[0087] (5) Phase difference adjustment film coating

[0088] A cyclic olefin transparent resin protective film is selected, and a PSA glue is selected as an adhesive. The process flow of coating the glue and the release film is the same as the above, and the coating process of the PSA glue is carried out simultaneously to obtain a semi-finished product.

[0089] (6) Conventional iodine-based top sheet and phase difference adjustment film bonding

[0090] The conventional upper film and the phase difference adjustment film with PSA adhesive are subjected to film tearing, rolling and laminating device, corona treatment, and rolled and laminated to form a finished product for use as the upper polarizer of the panel. Figure 4 .

[0091] (7) Panel attachment

[0092] Attach the upper polarizer and lower polarizer produced above to both sides of the LCD panel. You can choose a VA type panel or an IPS type, and test and observe the taste and brightness.

[0093] Example 2

[0094] The brightening dip-dye coating process is consistent with the above, without the need for a protective film, and is directly attached to both sides of the liquid crystal panel with the above-mentioned upper polarizer for taste and brightness testing and observation.

[0095] Comparative Example 1

[0096] The process of brightening dip coating and protective film coating and finally bonding to form the lower polarizer is consistent with the above. The upper film only has the conventional iodine-based upper film, and the dip-dyeing and bonding section of the phase difference film is removed. The two are attached to both sides of the liquid crystal panel for taste and brightness testing and observation.

[0097] Comparative Example 2

[0098] Select the upper and lower polarizers of conventional iodine-based polarizers and directly attach them to the two sides of the liquid crystal panel to test and observe the taste and brightness.

[0099]

[0100] From the above-mentioned implementation comparison results, it can be found that the two types of panels obtained by the present invention have obvious improvements in contrast performance and the picture in the dark state compared with the comparative example, and there is no light leakage phenomenon at a wide viewing angle.

[0101] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should know that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0102] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0103] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for matching a brightness enhancement film liquid crystal panel, characterized in that: include: A liquid crystal panel and an upper polarizer disposed on one side of the liquid crystal panel and a lower polarizer disposed on the other side of the liquid crystal panel; The upper polarizer is made by attaching an iodine-based upper polarizer and a phase difference adjustment film, and the lower polarizer is made by compositely attaching a brightness enhancement film and a TAC film or a single brightness enhancement film; The brightness enhancement film comprises a PVA coating, a substrate, a brightness enhancement reflective layer and a protective film which are laminated in sequence. The PVA coating is arranged at an end close to the liquid crystal panel, and the protective film is arranged at an end far from the liquid crystal panel.

2. A method for matching a brightness enhancement film liquid crystal panel according to claim 1, characterized in that: The brightness enhancement film PVA coating is prepared by copolymerization of polyvinyl alcohol monomer or modified PVA polymer monomer, and the thickness of the polyvinyl alcohol coating is 2-7 μm.

3. The method for matching a brightness enhancement film liquid crystal panel according to claim 1, characterized in that: The substrate type is a homopolymer or copolymer that is insoluble or poorly soluble in water, and the substrate type can also be a mixture of the homopolymer and the copolymer.

4. The method for matching a brightness enhancement film liquid crystal panel according to claim 3, characterized in that: The substrate material is one of syndiotactic or isotactic polyethylene resin, styrene block copolymer, polyvinyl chloride polyurethane, cellulose resin, or a mixture of two or more thereof.

5. The method for matching a brightness enhancement film liquid crystal panel according to claim 1, characterized in that: The thickness of the substrate itself is 30 to 90 μm, or 30 to 40 μm.

6. The method for matching a brightness enhancement film liquid crystal panel according to claim 1, characterized in that: The surface of the brightening reflective layer is etched with a plurality of prism pits, the prism pits can satisfy the requirement that light with an incident angle within ±35° in the normal direction is refracted and guided out, and the spacing between the plurality of prism pits is 20-60 μm.

7. The method for matching a brightness enhancement film liquid crystal panel according to claim 1, characterized in that: The protective film is made of polyethylene terephthalate, polypropylene resin, and polypropylene resin bonded together by electrostatic adsorption, and the bonding thickness is 40 to 50 μm.

8. A brightening film dip-dyeing process, characterized in that: A liquid crystal panel comprising a brightness enhancement film as claimed in any one of claims 1 to 7, wherein the specific process is as follows; Washing: The brightening film is rolled out by the unwinding mechanism, with the PVA coated surface inside the roll and the non-PVA surface outside the roll; Dyeing: The cleaned brightening film is placed in a dyeing tank for dyeing. The dyeing tank contains a mixed solution of iodine solution, boric acid, and iodine ions. The iodine element and iodine ions serve as dichroic media and adhere to the surface of the PVA coating of the film material. The mass concentration of elemental iodine in the dyeing tank is 0.2-1.0%, the concentration of boric acid is 4-8%, the dyeing time is 600-1000 seconds, and the temperature is 20-60°C; Cleaning and drying: After dyeing, the membrane flows through a glass knife that can cut water and scrape off residual liquid to clean the residual liquid and impurities on the surface of the membrane. Then the cleaned membrane flows through an oven to dry the water and stabilize the color. Glue coating: The cleaned and dried film material is coated with a pressure-sensitive adhesive (PSA) glue which is mixed and stirred with an acrylate main agent (solid content 18-45%) and additives (0.001-1% curing agent, 0.01-1% antistatic agent) and left to stand for degassing. The glue is supplied to a coating mechanism through a pressure of (3-10kg) and a quantitative pump and coated on the release agent surface of a release film (19-50μm thickness). The glue is passed through a gradient temperature oven (50-150℃). Under the action of the heat in the oven, the solvent absorbs heat and evaporates, and the hardener and the main agent form a hinge effect to form a polymer adhesive layer. The baking time is 1-3min. After drying, the glue is bonded to the brightening rubber wheel after trimming and is rolled up by a film-rewinding mechanism.

9. A brightness enhancement film dip-dyeing process according to claim 8, characterized in that: The infection process also includes a PSA glue aging process: after the glue is applied, an aging process is further set, wherein the temperature range is 20 to 55°C, the humidity range is set at 40 to 80%, and the aging time is 24 to 168 hours.

10. A brightness enhancement film dip-dyeing process according to claim 8, characterized in that: The drying process is specifically as follows: the oven is of clamshell type, arranged as three sections of equal length, the temperature range is 50-70°C, and the total residence time of the film material in the oven is 150-240s.

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