Polarizer, spectacle lens and display

Abstract

The utility model relates to the technical field of optical devices, in particular to a polaroid, a spectacle lens and a display. The polaroid comprises a first polycarbonate layer, a polyvinyl alcohol layer and a second polycarbonate layer, and the first polycarbonate layer, the polyvinyl alcohol layer and the second polycarbonate layer are sequentially stacked to form a sandwich structure. According to the polaroid, the structure of the polaroid is creatively designed into the sandwich structure of the polycarbonate layers, the polyvinyl alcohol layers and the polycarbonate layers, the polyvinyl alcohol layers play a role in polarization, and the two polycarbonate layers serve as base materials of the polaroid, have corresponding performance such as optical transmittance and also have the functions of supporting and protecting the polyvinyl alcohol layers. Compared with the existing polycarbonate-cellulose triacetate-polyvinyl alcohol-cellulose triacetate polaroid, the polaroid disclosed by the utility model has the advantages that the production cost is greatly reduced, the polaroid is not easy to layer during cutting, no rainbow pattern exists or the rainbow pattern is slight, and the stability is higher. The lens can be used in spectacle lenses, head-up display and LCD display.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical devices, in particular to a polarizer, a spectacle lens and a display. BACKGROUND

[0002] A polarizer is a material that can selectively absorb natural light. It can effectively absorb light perpendicular to the polarizing axis, so that light in the polarizing axis direction passes through, and finally makes natural light into linearly polarized light. The polarizer is made into polarized sunglasses, which has the characteristics of polarization and absorption of sunlight, and has become an essential product for outdoor tourism. The current common processing technology of polarized sunglasses mainly includes punching method, sandwich method and casting film method. The punching method is still mainly used in the market. The structure of most products on the market is a polarizer of polycarbonate-triacetyl cellulose-polyvinyl alcohol-triacetyl cellulose (PC-TAC-PVA-TAC), wherein PC is the lens substrate, TAC is the support layer, and PVA is the film layer that plays the role of polarizing.

[0003] Such a polarizer uses two layers of TAC, which is high in cost and prone to delamination and serious rainbow stripes when cutting. SUMMARY

[0004] The purpose of the present application is to provide a polarizer, a spectacle lens and a display, aiming to solve the problems of high cost, easy delamination and serious rainbow stripes of the polarizer in the prior art.

[0005] To achieve the above application purpose, the technical solution adopted by the present application is as follows:

[0006] In a first aspect, the present application provides a polarizer, which comprises a first polycarbonate layer, a polyvinyl alcohol layer and a second polycarbonate layer, and the first polycarbonate layer, the polyvinyl alcohol layer and the second polycarbonate layer are sequentially laminated to form a sandwich structure.

[0007] The polarizer of the present application creatively designs the structure of the polarizer as a sandwich structure of polycarbonate layer-polyvinyl alcohol layer-polycarbonate layer, wherein the polyvinyl alcohol layer plays the role of polarization, and the two polycarbonate layers serve as the substrate of the polarizer, having corresponding optical transmittance and other properties, while also serving the role of supporting and protecting the polyvinyl alcohol layer. Compared with the existing polarizer of polycarbonate-triacetyl cellulose-polyvinyl alcohol-triacetyl cellulose, the polarizer of the present application does not need two layers of triacetyl cellulose, greatly reducing the production cost. The polarizer is not prone to delamination when cutting, has no or slight rainbow stripes, and has higher stability.

[0008] In some embodiments, the polyvinyl alcohol layer is bonded to at least one of the first polycarbonate layer and the second polycarbonate layer by an adhesive.

[0009] In some embodiments, the adhesion between the polyvinyl alcohol layer and at least one of the first polycarbonate layer and the second polycarbonate layer is >1000 gf / 25mm.

[0010] In some embodiments, the first polycarbonate layer and the second polycarbonate layer have the same or different thicknesses of 60-120 μm.

[0011] In some embodiments, the polyvinyl alcohol layer has a thickness of 20-35 μm.

[0012] In some embodiments, the first polycarbonate layer and the second polycarbonate layer have the same or different thicknesses of 80-100 μm.

[0013] In some embodiments, the polyvinyl alcohol layer has a thickness of 25-30 μm.

[0014] In some embodiments, the first polycarbonate layer has a phase difference value Re < 20 μm.

[0015] In some embodiments, the second polycarbonate layer has a phase difference value Re < 20 μm.

[0016] In some embodiments, the polyvinyl alcohol layer has a light transmittance of 38-52% and a degree of polarization of 90-98%.

[0017] In some embodiments, the polarizing plate further comprises two release films, which are respectively attached to the surfaces of the first polycarbonate layer and the second polycarbonate layer away from the polyvinyl alcohol layer.

[0018] In a second aspect, the present application provides a spectacle lens, which comprises the polarizing plate of the present application.

[0019] The spectacle lens of the present application comprises the polarizing plate of the present application, and thus has good structural stability, is not prone to delamination, and has no or slight rainbow stripes. Meanwhile, the spectacle lens also has good optical performance, has the function of polarized light, and can well prevent glare and prevent the eyes from being damaged by sunlight, and can be used as outdoor sunglasses, myopia glasses, etc.

[0020] In a third aspect, the present application provides a display, which comprises a head-up display and an LCD display, and the display comprises the polarizing plate of the present application.

[0021] The display of the present application comprises the polarizing plate of the present application, and thus has good structural stability, is not prone to delamination, and has no or slight rainbow stripes. Meanwhile, the display also has good optical performance, has the function of polarized light, and can well prevent glare, and can be used as various displays. The display can comprise a head-up display for vehicles, which is beneficial to the driver to better observe the road conditions while driving without being easily disturbed by strong sunlight. The display can also comprise an LCD display, so that the LCD display has the functions of polarized display, anti-glare, anti-peep, etc. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the polarizer according to an embodiment of this application;

[0024] Figure label:

[0025] 1-First polycarbonate layer; 2-Second polycarbonate layer.

[0026] 3-Polyvinyl alcohol layer; Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0030] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0031] The weight of the related components mentioned in the embodiment specification of the present application can not only refer to the specific content of each component, but also represent the weight ratio relationship between each component. Therefore, as long as the content of the related components in the embodiment specification of the present application is enlarged or reduced in proportion, it is within the scope disclosed in the embodiment specification of the present application. Specifically, the mass in the embodiment specification of the present application can be μg, mg, g, kg and other mass units commonly known in the chemical industry.

[0032] The terms "first", "second" are only for descriptive purposes and are used to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the present application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0033] The first aspect of the present application provides a polarizing sheet. As shown in the embodiment of the present application, Figure 1 The polarizing sheet includes a first polycarbonate layer 1, a polyvinyl alcohol layer 3, and a second polycarbonate layer 2. The first polycarbonate layer 1, the polyvinyl alcohol layer 3, and the second polycarbonate layer 2 are sequentially laminated to form a sandwich structure.

[0034] Polycarbonate is abbreviated as PC, and polyvinyl alcohol is abbreviated as PVA.

[0035] The polarizing sheet of the present application creatively designs the structure of the polarizing sheet as a sandwich structure of PC layer-PVA layer-PC layer, wherein the PVA layer plays a role of polarization, and the two PC layers serve as the substrate of the polarizing sheet, have corresponding optical transmittance and other properties, and also have the functions of supporting and protecting the PVA layer. Compared with the existing polycarbonate-triacetyl cellulose-polyvinyl alcohol-triacetyl cellulose (PC-TAC-PVA-TAC) polarizing sheet, the polarizing sheet of the present application does not need two layers of TAC layer, greatly reducing the production cost. The polarizing sheet is not easy to delaminate when cutting, has no or slight rainbow stripes, and has higher stability.

[0036] Regarding the first polycarbonate layer and the second polycarbonate layer:

[0037] The two PC layers serve as the base of the polarizer and also support and protect the PVA layer. In some embodiments, the first PC layer and the second PC layer have the same or different thicknesses of 60-120 μιη, and in exemplary embodiments, can include but are not limited to any one of or a range between any two of 60 μιη, 80 μιη, 100 μιη, and 120 μιη. The thickness of the two PC layers is advantageous for further improving the structural stability between the layers of the polarizer, and the polarizer is not prone to delamination, and has no or slight rainbow patterns when cut.

[0038] In some embodiments, the first PC layer has a phase difference value Re < 20 μιη, and in exemplary embodiments, can include but are not limited to any one of or a range between any two of 2 μιη, 5 μιη, 10 μιη, 15 μιη, and 18 μιη. The phase difference value gives the polarizer the performance of correcting vision, such as for myopia lenses. Optionally, the second PC layer has a phase difference value Re < 20 μιη. The phase difference values of the first PC layer and the second PC layer can be the same or different.

[0039] Regarding the PVA layer:

[0040] The PVA layer has a polarizing effect, but the PVA layer is easily denatured by water, which affects the optical performance, and thus the PVA layer can be protected as an intermediate layer. In some embodiments, the PVA layer has a thickness of 20-35 μιη. In exemplary embodiments, can include but are not limited to any one of or a range between any two of 20 μιη, 25 μιη, 30 μιη, and 35 μιη. The PVA layer having the thickness is advantageous for designing suitable optical performance such as light transmittance and polarization degree, while also taking into account the bonding strength between the two PC layers, so that the polarizer is not prone to delamination, and has no or slight rainbow patterns when cut. Optionally, the PVA layer has a thickness of 25-30 μιη to further improve the above performance.

[0041] In some embodiments, the PVA layer has a light transmittance of 38%-52%, and in exemplary embodiments, can include but are not limited to any one of or a range between any two of 38%, 42%, 46%, 48%, and 52%, and a polarization degree of 90%-98%, and in exemplary embodiments, can include but are not limited to any one of or a range between any two of 90%, 92%, 95%, and 98%. The PVA layer having the light transmittance and polarization degree parameters has good optical performance, and gives the polarizer excellent light transmittance and polarization performance.

[0042] Regarding the entire polarizer:

[0043] The PC layer and the PVA layer can be combined by adhesion, one-piece injection molding, and other methods. In some embodiments, the PVA layer is adhesively combined with at least one of the first PC layer and the second PC layer, and optionally, the PVA layer is adhesively combined with both of the PC layers, and optionally, the adhesion is performed by an adhesive. In a prior art polarizing sheet of PC-TAC-PVA-TAC, the TAC layer and the PVA layer are generally adhesively combined by PVA glue. However, on the one hand, the polarizing sheet is prone to delamination and rainbow stripes when cut, and on the other hand, the polarizing sheet has poor high-temperature resistance and water resistance. In the polarizing sheet of the embodiments, the PVA layer is directly combined with the PC layer, and in addition to the PVA glue, other adhesives can also be used. In the embodiments, the adhesive can include a UV adhesive, and optionally, a free radical type acrylic adhesive and / or a cationic type epoxy adhesive. The use of these UV adhesives is conducive to the close combination of the PC layer and the PVA layer in the polarizing sheet of the embodiments, and the polarizing sheet is not prone to delamination and has no or slight rainbow stripes when cut. In addition, the polarizing sheet has high high-temperature resistance and water resistance, and will not delaminate even after long-term immersion in hot water.

[0044] In some embodiments, the adhesion between the PVA layer and at least one of the first PC layer and the second PC layer is greater than 1000 gf / 25 mm. When the adhesion between the PVA layer and at least one of the PC layers is greater than 1000 gf / 25 mm, the structural stability of the entire polarizing sheet is improved, and the polarizing sheet is not prone to delamination and has no or slight rainbow stripes when cut.

[0045] In some embodiments, two release films are further included, and the release films are respectively attached to the surfaces of the first PC layer and the second PC layer away from the PVA layer. The release films mainly have a protective effect, and can protect the polarizing sheet during storage and transportation. The release films can be removed when the polarizing sheet is applied. The release films can be polyethylene (PE) release films or polyethylene terephthalate (PET) release films, and the thickness of the release films can be 38-50 μm. In some embodiments, only one release film can be provided.

[0046] The above polarizing sheet can be prepared by the following steps S1-S3:

[0047] S1. Adopt 60 μm thickness of PVA to release, through water washing, swelling, dyeing, stretching process, and complementary color process, drying step. The water washing and swelling solvent adopts deionized water, the temperature is 25-32℃. The dyeing tank adopts high dichroic red, yellow, blue dye, the ratio of yellow: red: blue is 1:2:2.6, the solubility of the dye solution is 0.2%-1%, the dyeing temperature is 30-40℃; the solution of the stretching tank is boric acid solution, the content of boric acid is 1%-5%, the stretching temperature is 40-55℃; the solution of the complementary color tank is boric acid solution, the content of boric acid is 1%-5%, the temperature of the complementary color tank solution is 30-35℃. The drying temperature is 45-80℃, preferably 60-75℃. PVA element is obtained. The optical retention of the PVA element is 38%-52% in transmittance and 90%-98% in degree of polarization.

[0048] S2. The obtained PVA element is bonded with UV glue and PC, wherein the UV lamp can be selected from mercury lamp, halogen lamp or organic lamp.

[0049] S3. The PC composite PET protective film is applied, and a polycarbonate dye-based polarizing plate is obtained.

[0050] The second aspect of the embodiment of the application provides a spectacle lens, which contains the polarizing plate of the embodiment of the application.

[0051] The spectacle lens of the embodiment of the application contains the polarizing plate of the embodiment of the application, and thus has good structural stability, is not prone to delamination, and has no or slight rainbow stripes. Meanwhile, the spectacle lens also has good optical performance, has the function of polarized light, can prevent glare and prevent the eyes from being hurt by sunlight, and can be used as outdoor sunglasses, myopia glasses, etc.

[0052] The third aspect of the embodiment of the application provides a display, which includes a head-up display and an LCD display, and contains the polarizing plate of the embodiment of the application.

[0053] The display of the embodiment of the application contains the polarizing plate of the embodiment of the application, and thus has good structural stability, is not prone to delamination, and has no or slight rainbow stripes. Meanwhile, the display also has good optical performance, has the function of polarized light, can prevent glare, and can be used as various displays. The display can include a vehicle-mounted head-up display (HUD), which is beneficial to the driver to better observe the road conditions while driving without being easily disturbed by strong sunlight. The display can also include an LCD display, so that the LCD display has the functions of polarized display, anti-glare, anti-peep, etc.

[0054] The following will be described in combination with specific embodiments.

[0055] Embodiment 1

[0056] The embodiment provides a polarizing sheet, which is a sandwich structure of PC layer-PVA layer-PC layer, and the three layers are bonded by UV glue. The Re value of the lower PC is 5, and the Re value of the upper PC is not specifically required.

[0057] The preparation process comprises the following steps: selecting PVA raw material of M6000 model of Mitsubishi Chemical, and sequentially performing water washing, swelling, dyeing, stretching, color compensation and drying processes. The solution temperatures of the respective tanks are 27°C, 27°C, 31°C, 45°C, 30°C and 65°C respectively. The dyeing concentration in the dyeing tank is 0.5%, the boric acid concentration in the stretching tank is 2.0%, and the boric acid concentration in the color compensation tank is 1.5%, thereby obtaining a PVA element. The thickness of the PVA element is 25μm, the optical retention is 42% in transmittance, and the polarization degree is 98%.

[0058] S2. The obtained PVA element is bonded with PC using UV glue, and PC layers are combined on the upper and lower surfaces of the PVA layer. The UV lamp can be selected from a mercury lamp, a halogen lamp or an organic lamp. The UV glue is a mixed adhesive of a free radical type acrylic adhesive and a cationic type epoxy adhesive. The thickness of the two PC layers is 120μm.

[0059] S3. The upper PC is combined with a PET protective film, and the thickness of the PET protective film is 38μm.

[0060] Example 2

[0061] The embodiment provides a polarizing sheet, and the preparation process is the same as that of Example 1, except that the Re values of the upper and lower PC layers are both 25.

[0062] Example 3

[0063] The embodiment provides a polarizing sheet, and the preparation process is the same as that of Example 1, except that the Re values of the upper and lower PC layers are both 50.

[0064] Example 4

[0065] The embodiment provides a polarizing sheet, and the preparation process is the same as that of Example 1, except that the PVA water glue is used for bonding the PC layer and the PVA layer instead of the UV glue.

[0066] Comparative Example 1

[0067] The comparative example provides a polarizing sheet, which is a structure of PC layer-TAC layer-PVA layer-TAC layer, wherein the thickness of the PC layer is 120μm, the thickness of the two TAC layers is both 80μm, and the thickness of the PVA layer is 25μm, and each layer is bonded by PVA water glue.

[0068] Comparative Example 2

[0069] The comparative example provides a polarizing sheet with the structure of PC layer-TAC layer-PVA layer-TAC layer, which is different from the comparative example 1 in that each layer is adhered by UV glue, and the UV glue is the same as that of the example 1.

[0070] Related performance test and result analysis

[0071] The adhesive property and appearance property of the examples 1 to 4, the comparative example 1 and the comparative example 2 are tested.

[0072] The adhesive property testing method is that the polarizing sheet is cut into 25 mm width, and a universal tensile testing machine is used for testing at the speed of 300 mm / min.

[0073] The appearance testing method is that the sample is placed on a backlight with a polarizing film for testing, and the absorption axis of the sample and the absorption axis of the polarizing film of the backlight are perpendicular.

[0074] The performance test results of the sample of each case are shown in Table 1.

[0075] Table 1

[0076] Case Appearance determination Adhesive force (gf / 25mm) Layering Example 1 No rainbow, OK 1970 No layering after cutting Example 2 No rainbow, OK 1770 No layering after cutting Example 3 No rainbow, OK 1670 No layering after cutting Example 4 Slight rainbow, OK 1380 No layering after cutting Comparative Example 1 Severe rainbow, NG 180 Layering after cutting Comparative Example 2 Severe rainbow, NG 640 Layering after cutting

[0077] It can be seen from the cases and Table 1 that, compared with the polarizing sheet with the structure of PC layer-TAC layer-PVA layer-TAC layer in the prior art, the examples 1 to 4 are all adjusted to the polarizing sheet with the structure of PC layer-PVA layer-PC layer, and combined with the UV glue, the interlayer adhesive force is high, the cutting is not easy to delaminate, and the rainbow stripe is not easy to appear.

[0078] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A polarizer, characterized in that: It includes a first polycarbonate layer, a polyvinyl alcohol layer, and a second polycarbonate layer, which are stacked sequentially to form a sandwich structure. The polyvinyl alcohol layer is bonded to at least one of the first polycarbonate layer and the second polycarbonate layer; The adhesion between the polyvinyl alcohol layer and at least one of the first polycarbonate layer and the second polycarbonate layer is >1000gf / 25mm.

2. The polarizer according to claim 1, characterized in that: The thicknesses of the first polycarbonate layer and the second polycarbonate layer may be the same or different, ranging from 60 to 120 μm; And / or, the thickness of the polyvinyl alcohol layer is 20–35 μm.

3. The polarizer according to claim 1, characterized in that: The thicknesses of the first polycarbonate layer and the second polycarbonate layer may be the same or different, ranging from 80 to 120 μm; And / or, the thickness of the polyvinyl alcohol layer is 25–30 μm.

4. The polarizer according to claim 1, characterized in that: The phase difference Re of the first polycarbonate layer is less than 20 μm; And / or, the phase difference Re of the second polycarbonate layer is less than 20 μm.

5. The polarizer according to claim 1, characterized in that: The polyvinyl alcohol layer has a light transmittance of 38%–52% and a polarization degree of 90%–98%.

6. The polarizer according to claim 1, characterized in that: It also includes two release films, which are respectively attached to the surfaces of the first polycarbonate layer and the second polycarbonate layer that are away from the polyvinyl alcohol layer.

7. A spectacle lens, characterized in that: The spectacle lens contains a polarizing film as described in any one of claims 1 to 6.

8. A display, characterized in that: The display includes a head-up display and an LCD display, and the display contains a polarizer as described in any one of claims 1 to 6.

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