TW202323867A - Polarization grating films for curved surfaces, its manufacturing method and the metallic grating mold thereof - Google Patents

Abstract

A polarization grating films for curved surfaces, its manufacturing method and the metallic grating mold thereof is provided. The metallic grating mold includes a plurality of grooves. At least two different included angles are formed between these grooves and the surface of the metallic grating mold. The included angles are determined by transfer printing the normal lines of the disposal locations corresponding to the contour of the curved surface. Also, the oblique ion-beam etching is utilized to form the grooves. Therefore, the polarization grating films can be formed by the metallic grating mold. When the polarization grating films is bonded to the curved surface, the grating elements would be aimed to the direction of incident light. The problems of the tilt grating elements after bonding to the product with curved surfaces and the deriving problems of the reflection of the incident light resulting in the decreasing of the transmittance and the polarization contrast will be effectively solved.

Description

Curved surface bonded grating polarizing film and its manufacturing method and metal grid mold

The invention relates to the technical field of grating polarizing film, in particular to a grating polarizing film attached to a curved surface, a manufacturing method thereof and related metal grid moulds.

The polarizing film is an indispensable test in the liquid crystal display. It mainly encapsulates the liquid crystal molecules between two polarizing films, and cooperates with the control of the voltage at both ends to operate normally and display the desired pattern; the polarizing film is mainly The polymer compound polyvinyl alcohol film is used as the base material, and then impregnated with iodine solution to diffuse iodine ions into the polyvinyl alcohol, and then stretched and dried after being reduced and stabilized by boric acid aqueous solution. With the advancement of related technologies and the demand for miniaturization and light weight of products, metal grid polarizing films have great potential to replace existing polarizing films.

The metal grid polarizing film 10 mainly has a plurality of roughly parallel grid bodies 11, please refer to Figure 1A, different polarization effects are produced by the different values of the height, width, and spacing of the grid bodies 11; when the density period is smaller than the light The polarization characteristics can be exhibited at different wavelengths, and at the same time, different polarization states can be generated respectively perpendicular to the grid body 11 and parallel to the grid body 11 . However, with the wide application of curved surface display modules, the metal grid polarizing film 10 is also faced with the situation that it needs to be attached to the curved surface 12, as shown in Fig. 1B, when the metal grid polarizing film 10 is attached to the curved surface 12, the Influenced by the surface tension caused by being attached to the curved surface 12, the grid body 11 will be inclined, and the degree and distribution of the inclination depend on the shape of the curved surface 12; in this way, the inclined grid body 11 will cause the incident light Partial reflection, which in turn leads to a decrease in transmittance and polarization contrast.

Therefore, how to improve the curved surface lamination grating polarizing film to solve the above-mentioned deficiencies of the conventional technology is a topic that is urgently desired to be researched and developed by those engaged in this industry.

In view of this, the main purpose of the present invention is to provide a curved surface lamination grating polarizing film and its manufacturing method and a metal grid mold, using the transfer process to make the relevant metal grid mold, so that the formed curved surface lamination grating polarizing film After the curved surface is pasted, there will be no inclination, so as to solve the problems of light reflection and lower extinction ratio of the curved surface pasted grating polarizing film.

In order to achieve the above-mentioned purpose, the present invention provides a method for manufacturing a curved surface laminating grating polarizing film, which can be applied to objects to be pasted on a curved surface, and its steps include the following steps: Provide a metal grid mold, the metal grid mold has a plurality of grooves, each groove forms an angle with the surface of the metal grid mold, and these angles have at least two or more different values; According to the included angle of the trenches, a plurality of grid bodies are sequentially formed in the trenches; forming a substrate connecting the grid body on the surface of the metal grid mold; and The substrate and the grid bodies are peeled off from the metal grid mold to obtain a polarizing film with a curved surface attached to the grid.

According to an embodiment of the present invention, the aforementioned step of providing a metal grid mold includes: providing a base material and coating a photoresist material on one surface thereof; Define the position, width and length of the grid body on the photoresist material by exposure and development; sequentially etching the substrate at an included angle to form the trenches; and The photoresist material is removed to form a metal gate mold.

According to an embodiment of the present invention, the aforementioned included angle is obtained through the following steps: Get the contour of the surface; calculating the angle between the normals and an incident light from the normals corresponding to the positions of the grids on the profile; and The included angle of the groove is obtained by converting the included angle of the incident light.

According to an embodiment of the present invention, the substrate is ion-etched to form the grooves.

According to an embodiment of the present invention, the aforementioned substrate is made of silicon, compound semiconductor, glass or plastic.

According to an embodiment of the present invention, in the step of forming a plurality of gate bodies in the trenches according to the included angle of the trenches, the gate bodies are formed by electroplating or deposition.

According to an embodiment of the present invention, the aforementioned electroplating is performed by evaporation or sputtering.

According to an embodiment of the present invention, the aforementioned deposition is performed by electrochemical deposition.

According to an embodiment of the present invention, the aforementioned grid body is made of aluminum, iron, gold or silver.

According to an embodiment of the present invention, the aforementioned gate system has nanometer materials or quantum dots.

According to an embodiment of the present invention, an anti-reflection material is further formed at the end of the grid body.

According to an embodiment of the present invention, the aforementioned anti-reflection material is a dielectric material.

According to an embodiment of the present invention, before the step of forming the substrate on the surface of the metal grid mold, a step of defining the grid bodies by photolithography is further included.

According to an embodiment of the present invention, the aforementioned substrate is made of a photohardening polymer material.

According to an embodiment of the present invention, before the step of peeling off the substrate and the grid bodies from the metal grid mold, further includes curing the substrate by ultraviolet light.

According to an embodiment of the present invention, in the step of peeling the substrate and the grids from the metal grid mold to obtain the curved surface laminating grating polarizing film, the substrate and the grids are taken out by vacuum suction.

To achieve the above purpose, the present invention provides a curved surface bonded grating polarizing film, which is manufactured by the manufacturing method of the above embodiment.

In order to achieve the above-mentioned purpose, the present invention provides a metal grid mold for bonding a grating polarizing film with a curved surface, so as to manufacture a curved surface bonding grating polarizing film suitable for being attached to a curved surface, characterized in that: There are a plurality of grooves on the metal grid mold, and each groove forms an included angle with the surface of the metal grid mold, and these included angles have at least two or more different values.

According to an embodiment of the present invention, the aforementioned included angle is the angle between these normals and an incident light calculated by using the normals of the contours of the curved surface corresponding to the positions of the grooves, and the conversion is performed using the angle between the normals and the incident light Obtain the included angle of the aforementioned groove.

According to an embodiment of the present invention, the surface of the aforementioned metal grid mold further has rounded corners, chamfered corners or grooves.

In order to achieve the above purpose, the present invention provides a grating polarizing film attached to a curved surface, which is suitable for affixing to a curved surface, which is manufactured by using the metal grid mold of the above-mentioned embodiment.

Compared with the prior art, the present invention has the following advantages: (1) The present invention breaks through the problem of light reflection and lower extinction ratio caused by the inclination phenomenon of the existing curved surface bonding metal grid polarizing film on the curved surface. (2) The present invention utilizes the transfer printing process to make related metal grid molds, so that the formed curved surface is pasted with the grating polarizing film after the curved surface is pasted, and there will be no inclination, thereby improving the extinction ratio.

In the following detailed description by means of specific embodiments, it will be easier to understand the purpose, technical content, characteristics and effects of the present invention.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than Full examples. Based on the embodiments of the present invention, all other embodiments obtained by persons with ordinary knowledge in the technical field without making creative efforts belong to the scope of protection of the present invention. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined arbitrarily with each other.

In the description of the embodiments, when a structure is described as being located "on or above" or "below or below" another structure, the description should be construed to include the case where the structures are in contact with each other and the A case where a third structure is provided between structures. Embodiments will be described in detail below with reference to the drawings.

As described in the previous technology, when the conventional metal grid polarizing film is attached to a curved surface, the grid body will be tilted, and the transmittance and polarization contrast will decrease. In order to solve the above-mentioned technical problems, the basic idea of the present invention is to provide a method of manufacturing a curved surface lamination grating polarizing film, which can be used to form a curved surface lamination grating polarizing film with a pre-tilt angle through a transfer printing process. When combined to the curved surface, the grid body presents a roughly isotropic configuration, which can solve the problems of light reflection and lower extinction ratio caused by conventional structures. Therefore, when it is applied to products with curved surfaces such as sensing devices, optical lenses, glasses, electronic devices, etc., there will be no inclination, thereby improving the extinction ratio.

Please refer to FIGS. 2A-2E , which are schematic diagrams illustrating the manufacturing process of the manufacturing method of the curved surface lamination grating polarizing film provided by the embodiment of the present invention.

First, a metal grid mold 20 is provided. As shown in FIG. 2A, the metal grid mold 20 has a plurality of grooves 21, and each groove 21 forms an angle θ with the surface 201 of the metal grid mold 20, and these angles θ are There are at least two or more different values, in other words, the groove 21 has at least two or more slopes relative to the surface 201 of the metal gate mold 20 . Next, please refer to FIG. 2B, according to the included angle θ of each trench 21, a plurality of gate bodies 31 are sequentially formed in these trenches 21 of the metal gate mold 20, and the forming method can be electroplating or deposition, etc. The electroplating can be carried out by evaporation or sputtering, and the deposition can be carried out by, for example, electrochemical deposition. Then, the surface 201 of the metal grid mold 20 is removed by photolithography etching, and these grid bodies 31 are defined, as shown in FIG. 2C, and the substrate 32 connected to the grid body 31 is formed on the surface 201 of the metal grid mold 20 ( See FIG. 2D ), for example, the substrate 32 can be made of photocurable polymer material, and then the substrate 32 can be hardened by ultraviolet light curing. Finally, the substrate 32 and the grid bodies 31 are peeled off from the metal grid mold 20 to obtain a curved surface lamination grating polarizing film 30, please refer to FIG. 2E, and the curved surface lamination grating polarization film can be obtained by vacuum suction. The diaphragm 30 is taken out. From the aforementioned drawings, the included angle θ and the pre-tilt angle, number, position, size, configuration, etc. of the trench 21 and the formed grid body 31 are only for illustration, and are not intended to limit the use of only the state shown in the drawing. Samples and modes, based on the same principle as above, can be adjusted according to the actual use status. Furthermore, the material of the grid body 31 can be various metal materials such as aluminum, iron, gold, silver, etc., and its interior is not necessarily made of the same material or uniform material, and its interior can contain nanoparticles or quantum dots, Or anti-reflection materials such as dielectric materials are deposited at the end; at the same time, the cross-section of the type shown in the figure is a rectangle, which is not used to limit its shape. It can be square or conical (pyramid, cone, etc.) Or any other geometric shape, the shape and material can also be changed according to the actual use status.

Therefore, when the obtained curved surface lamination grating polarizing film 30 is applied to the object 40 to be attached with a curved surface 41, because the grating body 31 of the curved surface lamination grating polarizing film 30 matches the contour of the curved surface 41 type, and designed to have a pre-tilt type, please refer to the 3A, 3B Figures, so after being attached to the curved surface 41 of the object 40 to be attached, it is stretched to conform to the curved surface 41 of the object 40 to be attached , the pre-tilted grid body 31 is affected by its tension, and presents a state roughly parallel to each other (see Figure 3B), thus solving the problem of light reflection and reducing the extinction ratio produced by the conventional structure; wherein, the object 40 to be pasted can be such as Sensing devices, optical lenses, glasses, electronic devices and other products with curved surfaces.

Next, for the aforementioned part of providing the metal grid mold 20, the manufacturing (providing) method of the metal grid mold 20 is as follows; first, a substrate 23 is provided, and a photoresist material is coated on one side surface of the substrate 23 24. As shown in FIG. 4A, the base material 23 is usually a silicon substrate, or other compound semiconductors, glass, plastic and other materials, and the photoresist material can be an organic material or an inorganic material; then by exposing The development method defines the position, width and length of the grid body on the photoresist material 24 (see Figure 4B), in other words, it exposes the set position according to the required grid type. required width and length, and then sequentially etch the substrate 23 to form these grooves 21 according to the angle required by the gate body, please refer to FIG. 4C, because the angle θ required by the groove 21 is not the same ( As defined above, there are at least two different values), so in order to ensure the completeness of the etching, a segmented etching method can be used, that is, each etching only performs a single angle (angle θ) of the trench 21 etch, and the rest of the different angles, which have not yet been etched or have been etched, can be protected by photoresist materials, and then the etching of the trenches 21 at various angles (included angle θ) is completed sequentially. The etched part can be, for example, ion-etched; moreover, the angle θ that needs to be set for the trench 21 will be described in detail later. Finally, as shown in FIG. 4D, the metal grid mold 20 is formed by removing the photoresist material 24 by using, for example, photoresist liquid, and the formed metal grid mold 20 has grooves with at least two angles θ of different values. The groove 21, that is to say, among the plurality of grooves 21 it has, each groove 21 forms an angle θ with the surface 201 of the metal grid mold 20, and these angles θ have at least two or more different values. That is to say, the grid formed by the metal grid mold 20 will be irregular (that is, not all of them will be in a roughly parallel state), so that when they are subsequently attached to a curved surface, the finished product will be presented in conjunction with the stretching of the curved surface It is in a roughly parallel state (grid body), this part is the same as the above, and will not be repeated here.

On the other hand, in order to smoothly detach from the metal grid mold 20 when the grating polarizing film 30 is bonded to the upper curved surface in the future, rounded corners (see FIG. 4E ) or chamfers or grooves can be designed on the periphery of the metal grid mold 20 . Make it easier to peel off (whether it is peeled off by vacuum suction or other physical methods). In addition, in addition to the above-mentioned design, it is also possible to have the same or similar The design of this part is not the focus of this case, and those who are familiar with this technology can easily change or replace it. Here, it is only an example and will not be repeated.

Next, let’s explain the part of obtaining the included angle θ. These included angles θ are the inclined state of the grid body in the future, because it is to match the required curved surface, so that it can be roughly parallel after bonding, so It is necessary to obtain the values of these included angles θ by means of transfer printing or restoration. Please refer to Fig. 5A, first obtain the contour of the curved surface of the curved surface 41 of the object 40 to be pasted, and calculate these normals 501 and The included angle α of the incident light 60 is converted to the included angle α of the incident light 60 to obtain the included angle θ of the groove 21 (see Figure 5B). The included angle α between 501 and the incident light 60 may also be different, but because it is the contour of the curved surface of the curved surface 41, it will have at least two or more different included angles α, and therefore the included angle θ system has at least two or more different values. Specifically, the conversion method can be obtained by, for example, the angle α being equal to the value of the angle θ. As mentioned above, the curved surface 41 of the object to be pasted 40 shown in the drawings is only illustrative, and is used to describe in conjunction with this paragraph, and is not used to limit the surface that can only be applied to such a profile, any curved surface (in other words not completely Plane type) can be converted into the required groove 21 configuration by using the method provided by the present invention; moreover, the value of the included angle θ is not limited to only being equal to the included angle α, depending on the used type, Including material, surface complexity, use status after lamination, etc., other compensations or parameter values can also be appropriately added for conversion to obtain the best arrangement angle of the groove 21 .

Next, a specific embodiment is proposed to illustrate the manufacturing method of the metal grid mold 20 . First, the silicon substrate is evenly spin-coated on the surface with a photoresist material, and it is evenly distributed by two-stage coating of a spin coater, for example, the first stage is 750rmp, and the time is 15 seconds; the second stage is 3500rmp, and the time is 40s. two-stage spin coating. Then, place it in a baking tray at 100°C for 1 minute to harden the photoresist material; then, use the ultraviolet light of the mask aligner to perform hard contact exposure on the silicon substrate, the exposure time is 1.6 seconds, or The mask pattern was hard exposed with an exposure time of 1.6 seconds. Then, place the exposed silicon substrate on a baking tray for positive and negative resistance reverse baking at 120°C for 1 minute and fully expose the silicon substrate for 40 seconds. Then, shake and develop with a developer for about 40 seconds, rinse with deionized water for 1 minute, and then place the silicon substrate at 125° C. for 30 minutes to harden the photoresist. Next, use nitric acid (HNO ₃ ): hydrofluoric acid (HF): deionized water to form an etching solution at a ratio of 1:1:2, and perform etching for about 180 seconds, then rinse with deionized water for 1 minute, and Blow dry with nitrogen to define the position, width and length of the grid body. Next, the silicon substrate is subjected to oblique ion beam etching at a set inclination angle, and after all grooves are etched in sequence, the silicon substrate is soaked in acetone, heated to 65°C, and soaked for 10 minutes. Afterwards, use an ultrasonic oscillator to perform intermittent vibration until the photoresist is completely lifted off, and a metal grid mold with grooves with more than two different angles can be obtained.

As for the part of making the polarizing film laminated with a curved surface, a specific embodiment will be given below to illustrate. Firstly, put the aforementioned metal grid mold into the cavity of the electron beam evaporation machine, and vacuumize it. When the vacuum degree reaches 3x10 ^-6 Torr, start the evaporation of the aluminum film at the evaporation rate of 3.5~4.5Å/sec. , where the thickness is set to 300 nm. Next, the gate body is defined by photolithography, that is, the surface is etched to expose the gate body. Then, after coating the photocurable resin and irradiating the resin with ultraviolet light to cure the resin, the film can be torn off and the curved surface with an inclined angle is attached to the grating polarizing film. The above is only an example to illustrate a specific implementation, and it is not limited to only use the aforementioned numerical values or materials for implementation.

In the following, the present invention will be further described in detail and its efficacy verified in combination with the content of the optical simulation test, but it should not be interpreted as limiting the protection scope of the present invention.

Please refer to Fig. 6A and Fig. 6B, which are schematic diagrams showing the effect comparison of the optical simulation test of the curved surface laminating grating polarizing film provided by the embodiment of the present invention. It uses a glass lens with a curved surface, and is attached to a metal grating polarizer with an aluminum metal line width of 100nm, a thickness of 100nm, and a line spacing of 150nm, and uses the simulation software Comsol to obtain polarization data under white light irradiation. Through simulation analysis, it was found that the P-polarized light was increased from 93.4% to 95.4%, that is, the P-polarized light was increased by 2% in total; and the total extinction ratio was increased from 30dB to 36dB (increased by 20%).

To sum up, according to the curved surface laminated grating polarizing film and its manufacturing method and the metal grid mold provided by the present invention, the related metal grid mold is made by using the transfer printing process, so that the plurality of grooves of the metal grid mold and the surface of the metal grid mold can be aligned. An included angle is formed, and the value of the included angle has at least two or more different values, and the included angle of the groove is designed by the transfer printing process according to the outline of the curved surface to be bonded. Therefore, the curved surface formed by the metal grid mold is attached to the grating polarizing film, and there will be a pre-tilted grid body, and similarly, the tilt angle of the grid body will have more than two kinds of slopes, and its It also matches the contour of the surface to be bonded. Therefore, after laminating the curved surface, under the tension of the surface tension of the curved surface, the grating body will not be tilted, but will be roughly parallel to each other, so as to solve the light reflection and reduce extinction of the grating polarizing film bonded to the curved surface than the problem of the problem. When applied to products with curved surfaces such as sensing devices, optical lenses, glasses, and electronic devices, there will be no inclination, thereby improving the extinction ratio.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications based on the features and spirit described in the scope of the application of the present invention shall be included in the scope of the patent application of the present invention.

10: Metal grid polarizing film 11: grid body 12: Surface 20: Metal grid mold 201: surface 21: Groove 23: Substrate 24: Photoresist material 30: Curved surface bonded grating polarizing film 31: grid body 32: Substrate 40: Items to be posted 41: curved surface 501: Normal 60: incident light θ: included angle α: included angle

FIG. 1A is a schematic structural view of a conventional metal grid polarizing film. FIG. 1B is a schematic diagram of a conventional metal grid polarizer attached to a curved surface. 2A-2E are schematic diagrams of the manufacturing process of the method for manufacturing the curved surface lamination grating polarizing film provided by the embodiment of the present invention. Figures 3A-3B are schematic diagrams of a curved surface-bonded grating polarizing film provided by an embodiment of the present invention bonded to a curved surface. 4A-4E are schematic diagrams of the manufacturing process of the metal grid mold provided by the embodiment of the present invention. FIG. 5A and FIG. 5B are schematic diagrams of the groove angle obtained by the metal grid mold provided by the embodiment of the present invention. Figures 6A-6B are schematic diagrams showing the effect comparison of the optical simulation test of the curved surface laminating grating polarizing film provided by the embodiment of the present invention.

30: Curved surface bonded grating polarizing film

31: grid body

32: Substrate

40: Items to be posted

41: curved surface

Claims (21)

A method for manufacturing a grating polarizing film attached to a curved surface, which is suitable for attaching to a curved surface, comprises the following steps: A metal grid mold is provided, the metal grid mold has a plurality of grooves, each of the grooves forms an angle with a surface of the metal grid mold, and these angles have at least two or more different values; According to the included angle of the trenches, a plurality of grid bodies are sequentially formed in the trenches; forming a substrate connecting the grid bodies on the surface of the metal grid mold; and The substrate and the grid bodies are peeled off from the metal grid mold to obtain the curved surface-bonded grating polarizing film. The method for manufacturing a curved surface-attached grating polarizing film as described in Claim 1, wherein the step of providing the metal grid mold includes: providing a base material and coating a photoresist material on one surface thereof; Define the position, width and length of the grid body on the photoresist material by exposure and development; sequentially etching the substrate at the included angle to form the trenches; and removing the photoresist material to form the metal grid mold. The manufacturing method of the curved surface bonding grating polarizing film as described in claim 2, wherein the included angle is obtained by the following steps: Obtain the contour of the surface; calculating the angle between the normals and an incident light by using the normals corresponding to the positions of the gratings on the profile; and Converting the included angle of the incident light to obtain the included angle of the groove. The manufacturing method of the curved surface lamination grating polarizing film according to claim 2, wherein the substrate is formed with the grooves by ion etching. The method for manufacturing a curved surface lamination grating polarizing film as described in Claim 2, wherein the material of the substrate is silicon, compound semiconductor, glass or plastic. The manufacturing method of the curved surface lamination grating polarizing film as described in claim 1, wherein in the step of forming a plurality of grid bodies in the grooves according to the angle of the grooves, electroplating or deposition is used way to form the gates. The manufacturing method of the grating polarizing film attached to the curved surface as described in Claim 6, wherein the electroplating is performed by vapor deposition or sputtering. The manufacturing method of the curved surface bonding grating polarizing film as described in Claim 6, wherein the deposition method is performed by electrochemical deposition. The manufacturing method of the curved surface bonding grating polarizing film as described in Claim 1, wherein the material of the grating body is aluminum, iron, gold or silver. The manufacturing method of the grating polarizing film attached to the curved surface as described in Claim 1, wherein the grid has nanomaterials or quantum dots in its system. The manufacturing method of the curved surface bonding grating polarizing film as described in claim 1, wherein an anti-reflection material is further formed at the end of the grating body. The method of manufacturing a curved surface lamination grating polarizing film according to claim 11, wherein the anti-reflection material is a dielectric material. The method of manufacturing a curved surface lamination grating polarizing film as described in claim 1, wherein before the step of forming the substrate on the surface of the metal grid mold, it further includes the step of defining the grid bodies by photolithography . The manufacturing method of the curved surface lamination grating polarizing film as described in Claim 1, wherein the substrate is made of a photohardening polymer material. The method for manufacturing a curved-surface-attached grating polarizing film as described in claim 14, further includes curing the substrate by ultraviolet light before peeling off the substrate and the grid bodies from the metal grid mold. The method for manufacturing a curved surface-bonded grating polarizing film as described in Claim 1, wherein the substrate and the grid bodies are peeled off from the metal grid mold to obtain the curved surface-bonded grating polarizing film. The substrate and the gates are taken out by vacuum suction. A grating polarizing film attached to a curved surface, which is suitable for attaching to a curved surface, is manufactured by the manufacturing method described in claim 1. A metal grid mold for laminating a grating polarizing film on a curved surface, so as to manufacture a curved surface laminating grating polarizing film suitable for being attached to a curved surface, characterized in that: The metal grid mold has a plurality of grooves, each groove forms an angle with the surface of the metal grid mold, and the angles have at least two or more different values. The metal grid mold for laminating the grating polarizing film with a curved surface as described in claim 18, wherein the included angle is calculated by calculating the normals of the contours of the curved surface corresponding to the positions of the grooves and a The included angle of the incident light is converted to obtain the included angle of the groove by using the included angle with the incident light. The metal grid mold for laminating the grating polarizing film with a curved surface as described in claim 18, wherein the surface of the metal grid mold further has rounded corners, chamfered corners or grooves. A grating polarizing film attached to a curved surface, suitable for attaching to a curved surface, is manufactured using the metal grid mold described in claim 18.

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