Dye-series high-durability OLED polaroid for vehicle-mounted display and preparation method of dye-series high-durability OLED polaroid

Abstract

The invention relates to the technical field of polaroids, and discloses a preparation method of a dye-based high-durability OLED (Organic Light Emitting Diode) polaroid for vehicle-mounted display, and the preparation process comprises the following steps: putting a PVA (Polyvinyl Alcohol) film into a swelling tank containing 1.0 wt%-2.5 wt% of boric acid for swelling pretreatment; dip dyeing: soaking the PVA film subjected to dip dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the concentration of boric acid is 1wt%-6wt%, drying, curing the original plate, gluing, coating a pressure-sensitive adhesive on the dye polarized original plate, and then compounding the compensation film A, the compensation film B and the like. The dye-series high-durability OLED polaroid prepared by the invention has a thinned structure and excellent weather resistance, and after a 105 DEG C * 1000h dry temperature test, a 85 DEG C * 85% RH * 1000h high-temperature and high-humidity test and a weather resistance test are met, the optical performance change rate of the polaroid is less than or equal to 5%, and the product is free from depolarization and layering.

Description

Technical Field

[0001] The present invention relates to the technical field of polarizers, and in particular to a dye-based high-durability OLED polarizer for vehicle-mounted display and a preparation method thereof. Background Art

[0002] OLED (Organic Light Emitting Diode) is an organic light-emitting diode with self-luminous properties. Due to its ultra-thin, flexible, high contrast and fast response characteristics, it is widely used in displays, lighting and other electronic devices. In the field of display technology, polarizers are important optical components used to control the propagation direction and polarization state of light. Currently, OLED display technology has begun to be applied in automotive displays, becoming a new technical research and application direction. If OLED display technology is to achieve breakthroughs in the high-end automotive field, higher requirements are placed on the flexibility and thinness of polarizers, and at the same time, higher requirements are required for weather resistance.

[0003] Although iodine-based thin OLED polarizers with a thickness of 190μm and weather resistance of 65℃*93%RH*500h and 95℃*240h have been launched on the market, and some of them have begun to be applied to vehicle-mounted displays; however, compared with the increasingly stringent weather resistance design of vehicle-mounted displays, this iodine-based product has been restricted to a certain extent by its traditional preparation process, and it is difficult to meet the weather resistance requirements in the field of high-end vehicle-mounted displays. The strict use requirements of vehicle-mounted display technology make the material selection and preparation process of polarizers more complicated. The materials of traditional iodine-based polarizers cannot meet the weather resistance requirements of high temperature resistance of 105℃*1000h and high temperature and humidity resistance of 85℃*85%RH*1000h. Therefore, it is necessary to construct a new polarizer product structure design to realize the application of OLED polarizers in the field of high-end vehicle-mounted displays. Summary of the invention

[0004] The purpose of the present invention is to provide a dye-based high-durability OLED polarizer structure for vehicle-mounted display that meets the weathering test requirements of dry temperature 105°C*1000h and high temperature and humidity 85°C*85%RH*1000h and a preparation method thereof, so as to at least provide a beneficial choice or create conditions for solving one or more technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] A method for preparing a dye-based high-durability OLED polarizer for vehicle-mounted display, the preparation steps of which are as follows: 1) pretreatment, immersing a PVA film in a first water washing tank for water washing, and then entering a swelling tank containing 1.0wt%-2.5wt% boric acid for swelling pretreatment; 2) dyeing, immersing the PVA film after the swelling treatment in a dyeing solution tank containing a dichroic dye for dyeing treatment; the dyeing solution includes 0.003wt%-5wt% dichroic dye and 0.5wt%-2.5wt% dye auxiliary agent; 3) stretching, immersing the PVA film after the dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the concentration of the boric acid is 1wt%-6wt%, and the tank solution is 0.5wt%-1.5wt%. The temperature is 25℃-65℃, and the stretching ratio of the PVA film is 3-7 times; 4) Drying, washing and drying the stretched PVA film to obtain a dye-based polarizer; the drying temperature is 30℃-80℃; 5) Original plate curing, coating the upper and lower surfaces of the dried dye-based polarizer with adhesive, laminating triacetyl cellulose films respectively, and then drying and curing the adhesive to form a thin dye-based polarizer; the drying temperature is 90-130℃; 6) Gluing, coating the dye-based polarizer original plate with pressure-sensitive adhesive, and then compounding compensation film A; coating the pressure-sensitive adhesive on the side of compensation film A that is not coated with pressure-sensitive adhesive, and then compounding compensation film B; coating the pressure-sensitive adhesive on the side of compensation film B that is not coated with pressure-sensitive adhesive, and then compounding a layer of release film.

[0007] More preferably, in step 1), the PVA film is a PVA film with a thickness of 20-40 μm.

[0008] More preferably, in step 5), the triacetyl cellulose film is a triacetyl cellulose film layer with anti-ultraviolet performance, and the anti-ultraviolet performance refers to a transmittance of 0 to 5% at 380 nm of the full light spectrum.

[0009] More preferably, in step 5), the thickness of the triacetylcellulose film is 40 μm-60 μm.

[0010] More preferably, in step 5), the thickness of the formed thin dye-based polarizing film is 100-130 μm.

[0011] More preferably, in step 5), the formed thin dye-based polarizing film has a transmittance of 39%-42%, a polarization degree of ≥98%, and a hue bs value of ±5.

[0012] More preferably, in step 6), the compensation film A is an A-plate type liquid crystal compensation film, the thickness of the compensation film A is 1-5 μm, the compensation value Re is: 250 nm-290 nm, and the optical axis angle requirement is: 60-90°.

[0013] More preferably, in step 6), the compensation film B is an A-plate type liquid crystal compensation film, the thickness of the compensation film B is 1-5 μm, the compensation value Re is 120 nm-160 nm, and the optical axis angle is 5-25°.

[0014] On the other hand, the present invention also provides a dye-based high-durability OLED polarizer for vehicle display prepared by the preparation method of the above-mentioned dye-based high-durability OLED polarizer for vehicle display, and the optical performance requirements of the polarizer are as follows: transmittance: 39%-42%, preferably 40%; polarization degree: ≥98%, preferably 99%; reflectivity: ≤4%; the thickness of the polarizer is 130μm-270μm.

[0015] The present invention adopts the above technical solution to have at least the following beneficial effects.

[0016] 1. The current dye-based OLED polarizer still has some problems and limitations in improving weather resistance. First of all, it is necessary to balance the contradiction between polarization effect and transmittance. The reduction in polarizer thickness may reduce the polarization effect of light, resulting in a decrease in the contrast of the display. Therefore, while maintaining the reduction in the thickness of the dye-based polarizer, it is necessary to ensure the balance between polarization effect and transmittance by optimizing the material combination and preparation process. The dye-based high-durability OLED polarizer prepared by the present invention has the characteristics of high polarization and good overall display visual effect, with a transmittance of 39%-42%, polarization: ≥98%, and reflectivity of ≤4%. It effectively improves the brightness and contrast of the display, reduces reflection and scattering phenomena, achieves an overall visual black state effect, and better improves the quality of the displayed image.

[0017] 2. The dye-based high-durability OLED polarizer prepared by the present invention has excellent weather resistance and meets the requirements of 105°C*1000h dry temperature test and 85°C*85%RH*1000h wet temperature test. After the weather resistance test, the optical performance change rate of the polarizer is ≤5%, and the product has no depolarization or stratification.

[0018] 3. The dye-based high-durability OLED polarizer prepared by the present invention has a thickness of 130μm-270μm, which meets the technical requirements for high-end vehicle-mounted display use.

[0019] Fourth, the dye-based high-durability OLED polarizer also faces the challenge of the preparation process. The preparation process requires high-precision technology and equipment to ensure the preparation of a uniform and stable film structure. Because the instability of the preparation process may cause the quality of the polarizer to be unstable, it will affect the performance and life of the display. The dye-based high-durability OLED polarizer of the present invention adopts a new structural design and manufacturing process, which can reduce the manufacturing cost. Compared with the traditional polarizer manufacturing method, the polarizer manufacturing process of the present invention is simpler and more efficient, which can improve production efficiency and reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 4 is a schematic diagram of the structure of a polarizer in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to facilitate those skilled in the art to better understand the essence of the present invention, the specific implementation methods of the present invention are described in detail below.

[0022] The present invention provides a method for preparing a dye-based high-durability OLED polarizer for vehicle-mounted display, which mainly solves the following technical problems: 1) Realizing the thinning of dye-based OLED polarizers: Iodine-based OLED polarizers are not suitable for application in high-end vehicle-mounted displays due to their insufficient thickness and weather resistance. The present invention provides a solution for a dye-based high-durability OLED polarizer, which can improve weather resistance while reducing the thickness of OLED polarizers. 2) Improving the performance stability of OLED polarizers: OLED polarizers may have problems such as performance degradation and shortened life during long-term use. The present invention improves the performance stability of OLED polarizers and extends their service life by optimizing material selection and preparation processes.

[0023] Reference Figure 1 As shown, the dye-based high-durability OLED polarizer in the present invention has a dual compensation function, and is composed of a polarizer original plate, a compensation film layer A and a compensation film layer B compounded in sequence from top to bottom. The polarizer original plate is composed of a dye-based polarizing film and a protective film (triacetyl cellulose film) compounded on the upper and lower sides of the dye-based polarizing film. The polarizer original plate and the compensation film layer A, and the compensation film layer A and the compensation film layer B are respectively bonded by corresponding pressure-sensitive adhesives.

[0024] The protective film is a triacetyl cellulose film layer with anti-ultraviolet performance, wherein the anti-ultraviolet performance refers to a transmittance of 0-5% at 380nm of the full light spectrum. Meanwhile, the thickness of the triacetyl cellulose film is 40μm-60μm, preferably 40μm.

[0025] Dye-based polarizing film refers to a 30μm polyvinyl alcohol film that is swollen, dyed, stretched, color-corrected, and dried. The dyeing liquid is a dichroic dye liquid. The thin dye-based polarizing film is formed by bonding the upper and lower triacetyl cellulose film layers with an adhesive to form a thin dye-based polarizing original plate. The polarizing original plate has the characteristics of high temperature resistance and no yellowing. At the same time, the thickness is required to be 100-200μm, and the preferred thickness is 110μm.

[0026] The above dichroic dye solution is one or more of basic dyes, acid dyes, direct dyes and reactive dyes, and the hue bs value of the dye-based polarizing original plate is ±5.

[0027] The pressure-sensitive adhesive is mainly used to achieve the lamination of thin dye-based polarizing films and compensation films (including compensation film A and compensation film B), and the required thickness is 10-20 μm, and the preferred thickness is 15 μm.

[0028] The compensation film A of the present invention is an A-plate type liquid crystal compensation film. The main function is to achieve the overall visual black state effect of the polarizer. The thickness requirement of the compensation film is: 1-5μm, preferably 2-3μm. The compensation value Re requirement is: 250nm-290nm, preferably 260-280nm. The optical axis angle requirement is: 60-90°, preferably 65-85°.

[0029] The compensation film B described in the present invention is an A-plate type liquid crystal compensation film. The main function is to achieve the effect of integrated black polarizer. The thickness requirement of the compensation film is: 1-5 μm, preferably 2-3 μm. The compensation value Re requirement is: 120 nm-160 nm, preferably 133-143 nm. The optical axis angle requirement is: 5-25°, preferably 10-20°. Example 1

[0030] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0031] 1) Pretreatment: A 30 μm thick polyvinyl alcohol (PVA) film is used, which is immersed in the first washing tank for washing, and then enters the swelling tank containing 1.5%wt boric acid for swelling pretreatment.

[0032] 2) Dip dyeing: immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dip dyeing; the dyeing solution includes a dichroic dye at a concentration of 0.06wt%, a dye auxiliary at a concentration of 1.5wt%, etc. The dichroic dye can be a single dye or a mixture of multiple dyes.

[0033] 3) Stretching, immersing the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 2.5 wt %, the tank liquid temperature is 55° C., and the stretching ratio of the PVA film is 5 times.

[0034] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 60°C.

[0035] 5) The original plate is cured. The upper and lower surfaces of the dried dye-based polarizing element are coated with adhesive, and triacetyl cellulose films are attached to them respectively. Then, the adhesive is dried and cured to form a thin dye-based polarizing film.

[0036] The triacetyl cellulose film adopts a triacetyl cellulose film layer with anti-ultraviolet performance, the transmittance of the full light spectrum at 380nm is 0.5%, and the thickness of the triacetyl cellulose film is 40μm.

[0037] The adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperature (105°C); the transmittance of the obtained thin dye-based polarizing film is 39%, the polarization degree is 98%, and the hue b is -3; the drying temperature is 125°C.

[0038] 6) Gluing: Apply pressure-sensitive adhesive to the dye-based polarizing original plate, and then compound the compensation film A; apply pressure-sensitive adhesive to the side of the compensation film A that is not coated with pressure-sensitive adhesive, and then compound the compensation film B; apply pressure-sensitive adhesive to the side of the compensation film B that is not coated with pressure-sensitive adhesive, and then compound a layer of release film; obtain a dye-based high-durability OLED polarizer.

[0039] The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 2 μm, a compensation value Re of 260 nm, and an optical axis angle of 85°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 3 μm, a compensation value Re of 143 nm, and an optical axis angle of 20°. The thickness of the single-layer pressure-sensitive adhesive is 20 μm. Example 2

[0040] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0041] 1) Pretreatment: A 30 μm polyvinyl alcohol (PVA) film is used, which is immersed in a first water washing tank for water washing, and then enters a swelling tank containing 2.0 wt% boric acid for swelling pretreatment.

[0042] 2) Dip dyeing, immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dip dyeing; the dyeing solution includes 0.50wt% dichroic dye and 1.5wt% dye auxiliary agent, and the dichroic dye can be a single dye or a mixture of multiple dyes.

[0043] 3) Stretching, immersing the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 1.5wt%, the tank liquid temperature is 50°C, and the stretching ratio of the PVA film is 3 times.

[0044] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 60°C.

[0045] 5) The original plate is cured, and adhesive is applied to the upper and lower surfaces of the dried dye-based polarizer, and triacetyl cellulose films are attached to them respectively. Then, the adhesive is dried and cured to form a thin dye-based polarizing film; the adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperatures (105°C).

[0046] The triacetyl cellulose film adopts a triacetyl cellulose film layer with anti-ultraviolet performance, the transmittance of the full light spectrum at 380nm is 3%, and the thickness of the triacetyl cellulose film is 60μm.

[0047] The transmittance of the obtained thin dye-based polarizing film is 39%, the polarization degree is 98%, and the hue b is -4; the drying temperature is 125°C.

[0048] 6) Gluing: Apply pressure-sensitive adhesive to the dye-based polarizing original plate, and then compound the compensation film A; apply pressure-sensitive adhesive to the side of the compensation film A that is not coated with pressure-sensitive adhesive, and then compound the compensation film B; apply pressure-sensitive adhesive to the side of the compensation film B that is not coated with pressure-sensitive adhesive, and then compound a layer of release film; obtain a dye-based high-durability OLED polarizer.

[0049] The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 3 μm, a compensation value Re of 280 nm, and an optical axis angle of 65°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 2 μm, a compensation value Re of 133 nm, and an optical axis angle of 10°. The thickness of the single-layer pressure-sensitive adhesive is 15 μm. Example 3

[0050] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0051] 1) Pretreatment: A 30 μm polyvinyl alcohol (PVA) film is used, which is immersed in a first water washing tank for water washing, and then enters a swelling tank containing 1.8 wt% boric acid for swelling pretreatment.

[0052] 2) Dip dyeing: immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dip dyeing; the dyeing solution includes 1.5wt% dichroic dye, 0.8wt% dye auxiliary agent, etc. The dichroic dye can be a single dye or a mixture of multiple dyes.

[0053] 3) Stretching: soaking the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 5.5wt%, the tank liquid temperature is 65°C, and the stretching ratio of the PVA film is 7 times.

[0054] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 60°C.

[0055] 5) The original plate is cured, and the upper and lower surfaces of the dried dye-based polarizer are coated with adhesive, and triacetyl cellulose films are respectively attached. Then, the adhesive is dried and cured to form a thin dye-based polarizing film; the adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperature (105°C). The triacetyl cellulose film uses a triacetyl cellulose film layer with anti-ultraviolet properties, and the transmittance of the full light spectrum at 380nm is 1%, and the thickness of the triacetyl cellulose film is 50μm. The transmittance of the obtained thin dye-based polarizing film is 39%, the polarization degree is 98%, and the hue b is -4; the drying temperature is 110°C.

[0056] 6) Gluing: Apply pressure-sensitive adhesive to the dye-based polarizing original plate, and then compound the compensation film A; apply pressure-sensitive adhesive to the side of the compensation film A that is not coated with pressure-sensitive adhesive, and then compound the compensation film B; apply pressure-sensitive adhesive to the side of the compensation film B that is not coated with pressure-sensitive adhesive, and then compound a layer of release film; obtain a dye-based high-durability OLED polarizer.

[0057] The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 5 μm, a compensation value Re of 290 nm, and an optical axis angle of 90°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 5 μm, a compensation value Re of 120 nm, and an optical axis angle of 25°. The thickness of the single-layer pressure-sensitive adhesive is 10 μm. Example 4

[0058] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0059] 1) Pretreatment: A 30 μm polyvinyl alcohol (PVA) film is used, which is immersed in a first water washing tank for water washing, and then enters a swelling tank containing 2.5 wt % boric acid for swelling pretreatment.

[0060] 2) Dipping, immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dipping; the dyeing solution mainly includes 1.5wt% dichroic dye, 2.0wt% dye auxiliary agent, etc. The dichroic dye can be a single dye or a mixture of multiple dyes.

[0061] 3) Stretching, immersing the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 3.5wt%, the tank liquid temperature is 60°C, and the stretching ratio of the PVA film is 6 times.

[0062] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 80°C.

[0063] 5) The original plate is cured, and the upper and lower surfaces of the dried dye-based polarizer are coated with adhesive, and triacetyl cellulose film is attached respectively, and then the adhesive is dried and cured to form a thin dye-based polarizing film; the adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperature (105°C). The triacetyl cellulose film uses a triacetyl cellulose film layer with anti-ultraviolet performance, and the transmittance of the full light spectrum at 380nm is 2%, and the thickness of the triacetyl cellulose film is 40μm.

[0064] The transmittance of the obtained thin dye-based polarizing film is 42%, the polarization degree is 99%, and the hue b is 5; the drying temperature is 110°C.

[0065] 6) Gluing: Apply pressure-sensitive adhesive to the dye-based polarizing original plate, and then compound the compensation film A; apply pressure-sensitive adhesive to the side of the compensation film A that is not coated with pressure-sensitive adhesive, and then compound the compensation film B; apply pressure-sensitive adhesive to the side of the compensation film B that is not coated with pressure-sensitive adhesive, and then compound a layer of release film; obtain a dye-based high-durability OLED polarizer.

[0066] The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 1 μm, a compensation value Re of 250 nm, and an optical axis angle of 60°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 1 μm, a compensation value Re of 160 nm, and an optical axis angle of 5°. The thickness of the single-layer pressure-sensitive adhesive is 15 μm. Example 5

[0067] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0068] 1) Pretreatment: A 30 μm polyvinyl alcohol (PVA) film is used, which is immersed in a first water washing tank for water washing, and then enters a swelling tank containing 2.0 wt% boric acid for swelling pretreatment.

[0069] 2) Dipping, immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dipping; the dyeing solution mainly includes 3.5wt% dichroic dye, 2.5wt% dye auxiliary agent, etc. The dichroic dye can be a single dye or a mixture of multiple dyes.

[0070] 3) Stretching, immersing the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 3.5wt%, the tank liquid temperature is 60°C, and the stretching ratio of the PVA film is 5 times.

[0071] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 80°C.

[0072] 5) The original plate is cured, and the upper and lower surfaces of the dried dye-based polarizer are coated with adhesive, and triacetyl cellulose film is attached respectively, and then the adhesive is dried and cured to form a thin dye-based polarizing film; the adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperature (105°C). The triacetyl cellulose film uses a triacetyl cellulose film layer with anti-ultraviolet performance, and the transmittance of the full light spectrum at 380nm is 2%, and the thickness of the triacetyl cellulose film is 40μm.

[0073] The transmittance of the obtained thin dye-based polarizing film is 42.5%, the polarization degree is 99.2%, and the hue b is 5; the drying temperature is 95°C.

[0074] 6) Gluing: Apply pressure-sensitive adhesive to the dye-based polarizing original plate, and then compound compensation film A; apply pressure-sensitive adhesive to the side of compensation film A that is not coated with pressure-sensitive adhesive, and then compound compensation film B; apply pressure-sensitive adhesive to the side of compensation film B that is not coated with pressure-sensitive adhesive, and then compound a layer of release film; obtain a dye-based high-durability OLED polarizer. The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 1 μm and a compensation value Re of 250 nm. The optical axis angle is 60°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 1 μm, a compensation value Re of 160 nm, and an optical axis angle of 5°. The thickness of the single layer of pressure-sensitive adhesive is 20 μm. Example 6

[0075] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0076] 1) Pretreatment: A 30 μm polyvinyl alcohol (PVA) film is used, which is immersed in a first water washing tank for water washing, and then enters a swelling tank containing 2.0 wt% boric acid for swelling pretreatment.

[0077] 2) Dipping, immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dipping; the dyeing solution mainly includes 3.5wt% dichroic dye, 2.5wt% dye auxiliary agent, etc. The dichroic dye can be a single dye or a mixture of multiple dyes.

[0078] 3) Stretching, immersing the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 3.5wt%, the tank liquid temperature is 60°C, and the stretching ratio of the PVA film is 5.5 times.

[0079] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 80°C.

[0080] 5) The original plate is cured, and the upper and lower surfaces of the dried dye-based polarizer are coated with adhesive, and triacetyl cellulose film is attached respectively, and then the adhesive is dried and cured to form a thin dye-based polarizing film; the adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperature (105°C). The triacetyl cellulose film uses a triacetyl cellulose film layer with anti-ultraviolet performance, and the transmittance of the full light spectrum at 380nm is 2%, and the thickness of the triacetyl cellulose film is 40μm.

[0081] The transmittance of the obtained thin dye-based polarizing film is 42.5%, the polarization degree is 99.2%, and the hue b is 5; the drying temperature is 105°C.

[0082] 6) Gluing: Apply pressure-sensitive adhesive to the dye-based polarizing original plate, and then compound compensation film A; apply pressure-sensitive adhesive to the side of compensation film A that is not coated with pressure-sensitive adhesive, and then compound compensation film B; apply pressure-sensitive adhesive to the side of compensation film B that is not coated with pressure-sensitive adhesive, and then compound a layer of release film; obtain a dye-based high-durability OLED polarizer. The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 1 μm and a compensation value Re of 250 nm. The optical axis angle is 60°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 1 μm, a compensation value Re of 160 nm, and an optical axis angle of 5°. The thickness of the single layer of pressure-sensitive adhesive is 20 μm. Example 7

[0083] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0084] 1) Pretreatment: A 30 μm polyvinyl alcohol (PVA) film is used, which is immersed in a first water washing tank for water washing, and then enters a swelling tank containing 2.0 wt% boric acid for swelling pretreatment.

[0085] 2) Dipping, immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dipping; the dyeing solution mainly includes 2.5wt% dichroic dye, 1.0wt% dye auxiliary, etc. The dichroic dye can be a single dye or a mixture of multiple dyes.

[0086] 3) Stretching, immersing the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 3.5wt%, the tank liquid temperature is 60°C, and the stretching ratio of the PVA film is 5.0 times.

[0087] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 80°C.

[0088] 5) The original plate is cured, and the upper and lower surfaces of the dried dye-based polarizer are coated with adhesive, and triacetyl cellulose film is attached respectively, and then the adhesive is dried and cured to form a thin dye-based polarizing film; the adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperature (105°C). The triacetyl cellulose film uses a triacetyl cellulose film layer with anti-ultraviolet performance, and the transmittance of the full light spectrum at 380nm is 2%, and the thickness of the triacetyl cellulose film is 40μm.

[0089] The transmittance of the obtained thin dye-based polarizing film is 42.5%, the polarization degree is 99.2%, and the hue b is 5; the drying temperature is 125°C. Glue coating, apply pressure-sensitive adhesive on the dye-based polarizing original plate, and then composite compensation film A; apply pressure-sensitive adhesive on the side of compensation film A that is not coated with pressure-sensitive adhesive, and then composite compensation film B; apply pressure-sensitive adhesive on the side of compensation film B that is not coated with pressure-sensitive adhesive, and then composite a layer of release film; obtain a dye-based high-durability OLED polarizer. The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 1μm and a compensation value Re of 250nm. The optical axis angle is 60°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 1μm, a compensation value Re of 160nm, and an optical axis angle of 5°. The thickness of a single layer of pressure-sensitive adhesive is 20μm. Example 8

[0090] A dye-based high-durability OLED polarizer for vehicle-mounted display is prepared by the following steps.

[0091] 1) Pretreatment: A 30 μm polyvinyl alcohol (PVA) film is used, which is immersed in a first water washing tank for water washing, and then enters a swelling tank containing 1.8 wt % boric acid for swelling pretreatment.

[0092] 2) Dip dyeing, immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dip dyeing; the dyeing solution mainly includes 2.5wt% dichroic dye, 1.5wt% dye auxiliary agent, etc. The dichroic dye can be a single dye or a mixture of multiple dyes.

[0093] 3) Stretching, immersing the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the boric acid concentration is 3.5wt%, the tank liquid temperature is 60°C, and the stretching ratio of the PVA film is 5.0 times.

[0094] 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 80°C.

[0095] 5) The original plate is cured, and the upper and lower surfaces of the dried dye-based polarizer are coated with adhesive, and triacetyl cellulose film is attached respectively, and then the adhesive is dried and cured to form a thin dye-based polarizing film; the adhesive is a polyvinyl alcohol adhesive that does not turn yellow at high temperature (105°C). The triacetyl cellulose film uses a triacetyl cellulose film layer with anti-ultraviolet performance, and the transmittance of the full light spectrum at 380nm is 2%, and the thickness of the triacetyl cellulose film is 40μm.

[0096] The transmittance of the obtained thin dye-based polarizing film is 44%, the polarization degree is 99.3%, and the hue b is 5; the drying temperature is 125°C. Glue coating, apply pressure-sensitive adhesive on the dye-based polarizing original plate, and then composite compensation film A; apply pressure-sensitive adhesive on the side of compensation film A that is not coated with pressure-sensitive adhesive, and then composite compensation film B; apply pressure-sensitive adhesive on the side of compensation film B that is not coated with pressure-sensitive adhesive, and then composite a layer of release film; obtain a dye-based high-durability OLED polarizer. The compensation film A is an A-plate type liquid crystal compensation film with a thickness of 1μm and a compensation value Re of 250nm. The optical axis angle is 60°. The compensation film B is an A-plate type liquid crystal compensation film with a thickness of 1μm, a compensation value Re of 160nm, and an optical axis angle of 5°. The thickness of the single layer of pressure-sensitive adhesive is 20μm.

[0097] In order to better reflect the progress of the present invention, a comparative test is carried out below.

[0098] Comparative Example 1: The traditional iodine-based polarizer, the triacetyl cellulose film layer does not have anti-ultraviolet performance.

[0099] Comparative Example 2: Traditional iodine-based polarizer, the triacetyl cellulose film layer has anti-ultraviolet properties.

[0100] Comparative Example 3: The traditional dye-based polarizer, the triacetyl cellulose film layer does not have anti-ultraviolet performance.

[0101] Comparative Example 4: Traditional dye-based polarizer, the triacetyl cellulose film layer has anti-ultraviolet properties.

[0102] Comparative Example 5: Iodine-based OLED polarizer, the triacetyl cellulose film layer does not have anti-ultraviolet performance.

[0103] Comparative Example 6: Iodine-based OLED polarizer, the triacetyl cellulose film layer has anti-ultraviolet performance.

[0104] Comparative Example 7: A polarizer was prepared according to 6 wt % dye, 0.45 wt % auxiliary agent, 80° C. baking temperature of the PVA film, and 140° C. baking temperature of the original plate; other process parameters were consistent with those in Example 1.

[0105] Comparative Example 8: A polarizer was prepared according to 0.025 wt % dye, 0.60 wt % auxiliary agent, 90° C. baking temperature of the PVA film, and 130° C. baking temperature of the original plate; other process parameters were consistent with those in Example 1.

[0106] The performance tests of the polarizers prepared in the embodiments and comparative examples are shown in Table 1 and Table 2.

[0107] Table 1. Dry temperature (105℃*1000h) test results Test sample name Transmittance change rate / % Polarization change rate / % Hue bs value change rate / % Comparative Example 1 15 10 8.5 Comparative Example 2 12 8.0 13.5 Comparative Example 3 9.5 12 10 Comparative Example 4 7.0 10 6.5 Comparative Example 5 6.5 6.0 6.5 Comparative Example 6 6.5 7.0 8.0 Comparative Example 7 5.5 6.0 6.5 Comparative Example 8 5.5 6.5 6.0 This embodiment 1 4.5 2.5 4.0 This embodiment 2 4.0 2.0 3.5 Embodiment 3 3.5 3.0 2.5 This embodiment 4 3.0 2.5 3.5 This embodiment 5 4.5 4.0 4.5 This embodiment 6 4.5 3.5 4.0 This embodiment 7 4.5 4.5 3.5 This embodiment 8 4.0 4.5 5.0 .

[0108] Table 2. High temperature and high humidity (85°C*85%RH*1000h) test results Test sample name Transmittance change rate / % Polarization change rate / % Hue bs value change rate / % Comparative Example 1 10 8 9.5 Comparative Example 2 12 8.5 11.5 Comparative Example 3 8.5 9.5 7.5 Comparative Example 4 7.0 9.0 10.5 Comparative Example 5 6.5 8.5 6.0 Comparative Example 6 6.0 10.0 7.0 Comparative Example 7 5.5 7.0 6.0 Comparative Example 8 7.0 6.5 5.5 This embodiment 1 4.0 2.0 3.0 This embodiment 2 3.5 2.5 3.5 Embodiment 3 3.0 3.0 1.5 This embodiment 4 2.5 3.0 2.0 This embodiment 5 3.5 3.0 4.0 This embodiment 6 3.5 3.0 3.5 This embodiment 7 4.0 3.5 4.0 This embodiment 8 4.5 3.5 4.5 .

[0109] It can be seen from Table 1 and Table 2 that the dye-based high-durability OLED polarizer prepared in the present invention has excellent high temperature resistance, high temperature and high humidity weather resistance and UV resistance.

[0110] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The above embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. The parts not described in the specific embodiments are all prior art or common knowledge.

[0112] It should be noted that, in the description of the present invention, the content of the present invention can be more easily understood by referring to the detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definitions in this specification shall prevail.

[0113] In the present invention, the term "prepared from..." is used synonymously with "comprising". The terms "comprising", "including", "having", "containing" or any other variation thereof, as used in the present invention, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0114] In the present invention, when an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including a range of "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When a numerical range is described in the present invention, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0115] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

Claims

1. A method for preparing a dye-based high-durability OLED polarizer for vehicle-mounted display, characterized in that: The preparation steps are as follows: 1) Pretreatment: The PVA film is immersed in the first water washing tank for water washing, and then enters the swelling tank containing 1.0wt%-2.5wt% boric acid for swelling pretreatment; 2) Dipping, immersing the swollen PVA film in a dyeing solution tank containing a dichroic dye for dipping; the dyeing solution includes 0.003wt% to 5wt% of the dichroic dye and 0.5wt% to 2.5wt% of a dye auxiliary; 3) Stretching, soaking the PVA film after the dip-dyeing treatment in a solution tank containing boric acid, and stretching the PVA film; the concentration of boric acid is 1wt%-6wt%, the tank temperature is 25℃-65℃, and the stretching ratio of the PVA film is 3-7 times; 4) Drying: washing and drying the stretched PVA film to obtain a dye-based polarizing element; the drying temperature is 30°C-80°C; 5) Curing the original plate, coating the upper and lower surfaces of the dried dye-based polarizing element with adhesive, laminating the triacetyl cellulose film respectively, and then drying and curing the adhesive to form a thin dye-based polarizing film; the drying temperature is 90°C-130°C; 6) Gluing: Apply pressure-sensitive adhesive to the dye-based polarizing original plate, and then composite compensation film A; apply pressure-sensitive adhesive to the side of compensation film A that is not coated with pressure-sensitive adhesive, and then composite compensation film B; apply pressure-sensitive adhesive to the side of compensation film B that is not coated with pressure-sensitive adhesive, and then composite a layer of release film.

2. The method for preparing a dye-based high-durability OLED polarizer for vehicle display according to claim 1, characterized in that: In step 1), the PVA film has a thickness of 20-40 μm.

3. The method for preparing a dye-based high-durability OLED polarizer for vehicle display according to claim 1, characterized in that: In step 5), the triacetyl cellulose film is a triacetyl cellulose film layer with anti-ultraviolet performance, and the anti-ultraviolet performance refers to a transmittance of 0 to 5% at 380 nm of the full light spectrum.

4. The method for preparing a dye-based high-durability OLED polarizer for vehicle display according to claim 1, characterized in that: In step 5), the thickness of the triacetylcellulose film is 40 μm-60 μm.

5. The method for preparing a dye-based high-durability OLED polarizer for vehicle display according to claim 1, characterized in that: In step 5), the thickness of the formed thin dye-based polarizing film is 100-130 μm.

6. The method for preparing a dye-based high-durability OLED polarizer for vehicle display according to claim 1, characterized in that: In step 5), the formed thin dye-based polarizing film has a transmittance of 39%-42%, a polarization degree of ≥98%, and a hue bs value of ±5.

7. The method for preparing a dye-based high-durability OLED polarizer for vehicle display according to claim 1, characterized in that: In step 6), the compensation film A is an A-plate type liquid crystal compensation film, the thickness of the compensation film A is 1-5 μm, the compensation value Re is: 250nm-290nm, and the optical axis angle requirement is: 60-90°.

8. The method for preparing a dye-based high-durability OLED polarizer for vehicle display according to claim 1, characterized in that: In step 6), the compensation film B is an A-plate type liquid crystal compensation film, the thickness of the compensation film B is 1-5 μm, the compensation value Re is 120 nm-160 nm, and the optical axis angle is 5-25°.

9. A dye-based high-durability OLED polarizer for vehicle display prepared by the method for preparing a dye-based high-durability OLED polarizer for vehicle display as described in any one of claims 1 to 8, wherein the optical performance requirements of the polarizer are as follows: transmittance: 39%-42%, preferably 40%; polarization degree: ≥98%, preferably 99%; reflectivity: ≤4%; the thickness of the polarizer is 130μm-270μm.

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