Optical film structure, display device, and method for manufacturing optical film structure

Abstract

The present disclosure provides an optical film structure, a display device, and a method for manufacturing an optical film structure. The optical film structure includes a substrate and a surface feature. The substrate has a first region and a second region. The surface feature is disposed on the substrate. The surface feature has a first surface feature, the first surface feature is located above one of the first region and the second region, and the first surface feature is different from a surface feature on the other of the first region and the second region of the substrate.

Description

Technical Field

[0001] The present disclosure relates to an optical film structure, a display device, and a method for manufacturing the optical film structure, and more particularly to an optical film structure including a surface feature, a display device, and a method for manufacturing the optical film structure. Background Art

[0002] In recent years, displays (e.g., touch screens) have gradually become standard equipment in cars. In addition to the advantages of simple and beautiful appearance, the information that can be displayed on the display is also more diverse and rich, which can provide a new positive experience for drivers and passengers. In addition to the way of information integration, the difference between car displays and traditional car equipment in the past is that car displays can also integrate multiple functions. For example, physical buttons can be integrated through the operating system with a touch screen, thereby improving the appearance and texture of the cockpit. However, the operation process of car displays is different from that of general consumer products in terms of environment and requirements, and more safety aspects must be considered. Summary of the invention

[0003] In some embodiments, the present disclosure provides an optical film structure. The optical film structure includes a substrate and a surface feature. The substrate has a first region and a second region. The surface feature is disposed on the substrate. The surface feature has a first surface feature, the first surface feature is located above one of the first region and the second region, and the first surface feature is different from the surface feature on the other of the first region and the second region of the substrate.

[0004] In some embodiments, the present disclosure provides a display device. The display device includes a display panel and an optical film structure, and the optical film structure is disposed on the display panel. The optical film structure includes a substrate and a surface feature. The substrate has a first area and a second area. The surface feature is disposed on the substrate. The surface feature has a first surface feature, the first surface feature is located above one of the first area and the second area, and the first surface feature is different from a surface feature on the other of the first area and the second area of ​​the substrate.

[0005] In some embodiments, the present disclosure provides a method for manufacturing an optical film structure, which includes: providing a substrate having a first area and a second area, wherein the first area is configured to correspond to a touch function area of ​​a display panel; and forming a surface feature on one of the first area and the second area of ​​the substrate, wherein the surface feature has a first surface feature, and the first surface feature is different from the surface feature on the other of the first area and the second area of ​​the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to make the features and advantages of the present disclosure more clearly understood, different embodiments are specifically cited below and described in detail with the accompanying drawings. It should be noted that the various features in the drawings are not drawn according to the actual scale and are only used for illustration. In fact, the sizes of the various components in the drawings can be arbitrarily enlarged or reduced according to actual applications to clearly show the features of the embodiments of the present disclosure.

[0007] Figure 1A is a top view of a display device according to some embodiments of the present disclosure.

[0008] Figure 1B is a cross-sectional view of a display device according to some embodiments of the present disclosure.

[0009] Figure 2A and Figure 2B is a cross-sectional view of a display device according to some embodiments of the present disclosure.

[0010] Figure 3A is a top view of a display device according to some embodiments of the present disclosure.

[0011] Figure 3B is a cross-sectional view of a display device according to some embodiments of the present disclosure.

[0012] Figure 4A , Figure 4B , Figure 5A , Figure 5B , Fig. 6A , Figure 6B , Fig. 7A and Figure 7B is a cross-sectional view of a display device according to some embodiments of the present disclosure.

[0013] Fig. 8A and Figure 8B is a cross-sectional view of an optical film structure according to some embodiments of the present disclosure.

[0014] Fig. 9A , Fig. 9B and Fig. 9C is a flow chart of a method for manufacturing an optical film structure according to some embodiments of the present disclosure.

[0015] Fig. 10A , Fig. 10B and Fig. 10C is a flow chart of a method for manufacturing an optical film structure according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0016] The following disclosure provides many different embodiments or examples to show the different components of the embodiments of the present disclosure. The following will disclose specific examples of the various components of this specification and their arrangement to simplify the description of the present disclosure. Of course, these specific examples are not used to limit the present disclosure. For example, if the following disclosure of this specification describes forming a first component on or above a second component, it means that it includes an embodiment in which the formed first component and the second component are in direct contact, and also includes an embodiment in which an additional component can be formed between the above-mentioned first component and the second component, and the first component and the second component are not in direct contact. In addition, the various examples in the description of the present disclosure may use repeated reference symbols and / or words. The purpose of these repeated symbols or words is to make the present disclosure simpler and clearer, and is not used to limit the relationship between the various embodiments and / or the configurations.

[0017] Furthermore, in order to conveniently describe the relationship between one component or part and another component or parts in the drawings, spatially relative terms such as "under", "below", "lower", "above", "upper" and the like may be used. In addition to the orientations shown in the drawings, spatially relative terms also cover different orientations of the structure or device in use or operation. When the structure or device is turned to a different orientation (for example, rotated 90 degrees or other orientations), the spatially relative adjectives used therein will also be interpreted according to the orientation after the turn.

[0018] Here, the terms "about", "approximately", and "generally" generally mean within 20% of a given value or range, preferably within 10%, and more preferably within 5%, or within 3%, or within 2%, or within 1%, or within 0.5%. It should be noted that the quantities provided in the specification are approximate quantities, that is, in the absence of specific description of "about", "approximately", and "generally", the meanings of "about", "approximately", and "generally" can still be implied.

[0019] The embodiments disclosed herein provide an optical film structure for a display device, wherein the optical film structure includes a surface feature member located on a specific area of ​​a substrate, and the surface features of the surface feature member are different from other surface features on other areas of the substrate. When the specific area and other areas of the substrate correspond to the touch function area and image display area of ​​the display panel, or correspond to different touch input function areas of the display panel, the user can perceive different areas by tactile differences without distracting the visual display panel, thereby improving the convenience of use. Furthermore, when the surface feature member is used in a car display, it can improve the concentration and safety of driving. The embodiments of the optical film structure will be further described in detail below.

[0020] Please refer to Figure 1A and Figure 1B , Figure 1Ais a top view of a display device 1 according to some embodiments of the present disclosure, Figure 1B is a cross-sectional view of a display device according to some embodiments of the present disclosure. In some embodiments, Figure 1B is along Figure 1A The display device 1 includes an optical film structure 10 and a display panel 20. In some embodiments, the optical film structure 10 includes a substrate 100 and a surface feature element 200, and the surface feature element 200 is disposed on the substrate 100.

[0021] In some embodiments, the substrate 100 has a region R1 (also referred to as a "first region") and a region R2 (also referred to as a "second region"). In some embodiments, the substrate 100 includes an optical film (e.g., a polarizing plate or an optical property adjustment film), an organic base layer, or any combination thereof. In some embodiments, the structure of the polarizing plate may include a plurality of film layers, such as: a surface protection film, an adhesive layer, a first protection layer, a polarizer, a second protection layer, an adhesive layer, a release film, etc., in order from top to bottom, but the structure disclosed herein is not limited thereto, for example, the first and / or second protection layers may be omitted, or other optical film layers may be added.

[0022] In some embodiments, the material of the polarizer may be a polyvinyl alcohol (PVA) resin, which may be obtained by saponifying polyvinyl acetate resin. The degree of saponification of polyvinyl alcohol resin is generally about 85 mol% or more. Examples of polyvinyl acetate resins include monomers of vinyl acetate (i.e., polyvinyl acetate), copolymers of vinyl acetate, and other monomers that can be copolymerized with vinyl acetate. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, ethyl acrylate, n-propyl acrylate, methyl methacrylate), olefins (e.g., ethylene, propylene, 1-butene, 2-methylpropylene), vinyl ethers (e.g., ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acids (e.g., vinyl sulfonic acid, sodium vinyl sulfonate), etc. As specific examples of copolymers of the above-mentioned vinyl acetate and other monomers that can be copolymerized therewith, ethylene-vinyl acetate copolymers, etc., can be cited. The degree of polymerization of the polyvinyl alcohol resin is generally about 1000 to 10000, preferably about 1500 to 5000. The polyvinyl alcohol resin may be modified, for example, polyvinyl formal, polyvinyl acetal, polyvinyl butyral, etc. modified with aldehydes may be used. In some embodiments, the thickness of the polarizer is 5 to 35 microns, preferably 20 to 30 microns.

[0023] In some embodiments, the material of the first protective layer and the second protective layer may be, for example, a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc. The thermoplastic resin may include acetyl cellulose resin (e.g., triacetate cellulose (TAC), diacetate cellulose (DAC)), acrylic resin (e.g., polymethyl methacrylate (PMMA), polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), olefin resin, polycarbonate resin, cycloolefin resin, oriented-polypropylene (OPP), polyethylene (PE), polypropylene (PP), cyclic olefin polymer (COP), cyclic olefin copolymer (COP), polyolefin copolymer (COP), polypropylene (PP ... copolymer (COC), polycarbonate (PC), or any combination thereof. In addition, the materials of the first protective layer and the second protective layer may also be, for example, the following thermosetting resins or UV-curing resins: (meth) acrylic acid, urethane (for example, polyurethane (PU)), acrylic urethane (for example, polyacrylic urethane), epoxy (for example, epoxy resin), silicone (for example, silicone resin), etc. In addition, the first protective layer and the second protective layer may be further subjected to surface treatment, for example, anti-glare treatment, anti-reflection treatment, hard coating treatment, anti-static treatment or anti-fouling treatment. In addition, in some embodiments, the first protective layer and the second protective layer are a single-layer or multi-layer optical film. In some embodiments, the thickness of the first protective layer and the second protective layer may be independently 5 to 90 microns, preferably 35 to 80 microns.

[0024] In some embodiments, the adhesive layer includes a pressure sensitive adhesive (PSA), a heat sensitive adhesive, a solvent volatile adhesive, and / or a UV curable adhesive. In some embodiments, the pressure sensitive adhesive may include natural rubber, synthetic rubber, styrene block copolymer, (meth) acrylic acid block copolymer, polyvinyl ether, polyolefin, and / or poly (meth) acrylate. In some embodiments, (meth) acrylic acid (or acrylate) refers to both acrylic acid and methacrylic acid. In some embodiments, the pressure sensitive adhesive may include (meth) acrylate, rubber, thermoplastic elastomer, polysilicone, urethane, and combinations thereof. In some embodiments, the pressure sensitive adhesive is based on a (meth) acrylic acid pressure sensitive adhesive or based on at least one poly (meth) acrylate.

[0025] In some embodiments, the polarizing plate may further include an adhesive layer (not shown) located between the first protective film and the polarizer, and between the second protective film and the polarizer. The adhesive layer may include an aqueous adhesive, generally, for example, a polyvinyl alcohol resin or a carbamate resin is used as the main component of the aqueous adhesive, and in order to improve the adhesion, a composition made by adding a crosslinking agent or a curing compound such as an isocyanate compound or an epoxy compound can be added. In some embodiments, when the main component of the aqueous adhesive is a polyvinyl alcohol resin, in addition to partially saponified polyvinyl alcohol and completely saponified polyvinyl alcohol, a polyvinyl alcohol resin such as carboxyl-modified polyvinyl alcohol, acetyl-modified polyvinyl alcohol, hydroxymethyl-modified polyvinyl alcohol, and amino-modified polyvinyl alcohol can also be used. The aqueous solution of this type of polyvinyl alcohol resin can be used as an aqueous adhesive, and the concentration of the polyvinyl alcohol resin in the aqueous adhesive is generally 1 to 10 parts by mass relative to 100 parts by mass of water, preferably 1 to 5 parts by mass. In some embodiments, in order to improve the adhesion as described above, a curable compound such as a polyvalent aldehyde, a water-soluble epoxy resin, a melamine compound, a zirconium oxide compound, and a zinc compound may be added to the aqueous adhesive composed of the aqueous solution of the polyvinyl alcohol resin.

[0026] In some embodiments, the adhesive layer may be a UV-curable adhesive, and the materials may include, for example: acrylic adhesives, epoxy adhesives, urethane adhesives, polyester adhesives, polyvinyl alcohol adhesives, polyolefin adhesives, modified polyolefin adhesives, polyvinyl alkyl ether adhesives, rubber adhesives, vinyl chloride-vinyl acetate adhesives, SEBS (styrene-ethylene-butylene-styrene copolymer) adhesives, ethylene-styrene copolymers and other ethylene adhesives, ethylene-(meth)acrylate methyl copolymers, ethylene-(meth)acrylate ethyl copolymers and other acrylate adhesives, etc.

[0027] In some embodiments, the surface feature 200 has a surface feature (also referred to as a "first surface feature"), which is located above one of the regions R1 and R2 (e.g., region R1), and the surface feature of the surface feature 200 is different from another surface feature on the other of the regions R1 and R2 (e.g., region R2) of the substrate 100. In some embodiments, various surface features may each include surface elevation, surface roughness, surface static friction coefficient, or any combination thereof.

[0028] In some embodiments, the surface feature 200 includes a patterned layer 200C, and the surface of the patterned layer 200C is located at a different height from the surface of the substrate 100. In some embodiments, the difference between the surface height of the patterned layer 200C and the surface height of the substrate 100 is equal to or greater than about 5 μm, or equal to or greater than about 6 μm, or equal to or greater than about 8 μm, or equal to or greater than about 10 μm, or equal to or greater than about 15 μm. In some embodiments, the patterned layer 200C may include a plurality of patterned blocks (e.g., patterned blocks 210, 220, 230, and 240). In some embodiments, the height difference between the surface 210a of the patterned block 210 and the surface 100a of the substrate 100 is equal to or greater than about 5 μm, the height difference between the surface 220a of the patterned block 220 and the surface 100a of the substrate 100 is equal to or greater than about 5 μm, the height difference between the surface 230a of the patterned block 230 and the surface 100a of the substrate 100 is equal to or greater than about 5 μm, and / or the height difference between the surface 240a of the patterned block 240 and the surface 100a of the substrate 100 is equal to or greater than about 5 μm. In some embodiments, the height of the surface 210a of the patterned block 210, the height of the surface 220a of the patterned block 220, the height of the surface 230a of the patterned block 230, and the height of the surface 240a of the patterned block 240 may be the same as or different from each other.

[0029] According to some embodiments of the present disclosure, the difference between the surface height of the patterned layer 200C of the surface feature 200 and the surface height of the substrate 100 is equal to or greater than at least about 5 μm, so that sufficient tactile perception difference can be provided through this height difference, thereby providing sufficient tactile perception discrimination. Furthermore, according to some embodiments of the present disclosure, the total thickness (or total height) of the substrate 100 (e.g., a polarizing plate) and the patterned layer 200C of the surface feature 200 is equal to or less than about 1.5 mm, so that the total thickness of the substrate 100 and the surface feature 200 is prevented from being too large, which may have an adverse effect on the touch function (e.g., the touch function area 20R1) of the display panel 20 (e.g., causing a decrease in touch sensitivity).

[0030] In some embodiments, the area of ​​the patterned layer 200C is equal to or greater than 1 mm 2 In some embodiments, the area of ​​each of the patterned areas 210, 220, 230, and 240 is equal to or greater than 1 mm. 2 .

[0031] In some embodiments, the surface feature 200 (e.g., the patterned layer 200C) and the substrate 100 have different surface roughnesses. In some embodiments, the surface 210a of the patterned block 210, the surface 220a of the patterned block 220, the surface 230a of the patterned block 230, and / or the surface 240a of the patterned block 240 each have a different surface roughness from the surface 100a of the substrate 100. In some embodiments, the surface roughness difference value of the surface 210a of the patterned block 210, the surface 220a of the patterned block 220, the surface 230a of the patterned block 230, and / or the surface 240a of the patterned block 240 and the surface 100a of the substrate 100 may be equal to or greater than about 0.135 μm, or equal to or greater than about 0.15 μm. In some embodiments, the surface roughness of the surface 210a of the patterned block 210, the surface roughness of the surface 220a of the patterned block 220, the surface roughness of the surface 230a of the patterned block 230, and the surface roughness of the surface 240a of the patterned block 240 may be the same as or different from each other.

[0032] According to some embodiments of the present disclosure, the surface roughness difference between the patterned layer 200C of the surface feature 200 and the substrate 100 is equal to or greater than at least about 0.135 μm, so that sufficient tactile perception difference can be provided through the roughness difference, thereby providing sufficient tactile perception discrimination.

[0033] In some embodiments, the surface feature 200 (e.g., the patterned layer 200C) and the substrate 100 have different surface static friction coefficients. In some embodiments, the surface 210a of the patterned block 210, the surface 220a of the patterned block 220, the surface 230a of the patterned block 230, and / or the surface 240a of the patterned block 240 each have different surface static friction coefficients from the surface 100a of the substrate 100. In some embodiments, the difference in surface static friction coefficients between the surface 210a of the patterned block 210, the surface 220a of the patterned block 220, the surface 230a of the patterned block 230, and / or the surface 240a of the patterned block 240 and the surface 100a of the substrate 100 may be equal to or greater than 0.05 μs. In some embodiments, the surface static friction coefficients of the surface 210a of the patterned block 210, the surface static friction coefficients of the surface 220a of the patterned block 220, the surface static friction coefficients of the surface 230a of the patterned block 230, and the surface static friction coefficients of the surface 240a of the patterned block 240 may be the same as or different from each other.

[0034] According to some embodiments of the present disclosure, the difference in static friction coefficient between the patterned layer 200C of the surface feature 200 and the substrate 100 is equal to or greater than at least about 0.05 μs. In this way, the difference in tactile perception of slippery or dry feeling generated by the difference in static friction coefficient can provide sufficient tactile perception difference, thereby providing sufficient tactile perception discrimination.

[0035] In some embodiments, the light transmittance of the surface feature 200 is equal to or greater than about 90%, or equal to or greater than about 95%, or equal to or greater than about 98%, so as not to adversely affect the clarity of the display image of the display panel below.

[0036] In some embodiments, the thickness of the surface feature 200 is equal to or greater than about 5 micrometers (μm), or equal to or greater than about 6 μm, or equal to or greater than about 8 μm, or equal to or greater than about 10 μm, or equal to or greater than about 15 μm.

[0037] In some embodiments, the surface feature 200 may include polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC), triacetyl cellulose (TAC), polyimide (PI), polyvinyl chloride (PVC), polypropylene (PP), cycloolefin polymer (COP), silicon oxide, silicon nitride, silicon oxynitride, or any combination thereof. In some embodiments, the surface feature 200 may further include antibacterial ions, which may be zinc ions or silver ions. In some embodiments, the antibacterial ions may be coated on the surface of the surface feature 200. The zinc ions and / or silver ions may be combined with cell membranes, enzyme proteins, etc. to destroy and solidify the cell membranes, so that bacterial reproduction may be inhibited by interfering with the cell's nutrient uptake. In some embodiments, antibacterial ions may also be added to the surface of the substrate 100 to extend the antibacterial time.

[0038] In some embodiments, the display panel 20 has an image display area 20R2 and a touch function area 20R1. In some embodiments, the surface features (or first surface features) of the surface feature 200 of the optical film structure 10 are located above one of the image display area 20R2 and the touch function area 20R1. In some embodiments, the ratio of the area of ​​the surface features (or first surface features) of the surface feature 200 of the optical film structure 10 to the total area of ​​the image display area 20R2 and the touch function area 20R1 of the display panel 20 may be equal to or less than 50%, or equal to or less than 45%, or equal to or less than 40%, or equal to or less than 30%, or equal to or less than 20%. In some embodiments, the display panel 20 may be a liquid crystal display panel, for example, an IPS liquid crystal display panel, or a VA liquid crystal display panel. In some embodiments, the display panel 20 may be an OLED panel.

[0039] In some embodiments, the region R1 of the substrate 100 is configured to correspond to the touch function region 20R1 of the display panel 20. In some embodiments, the surface features (or first surface features) of the patterned layer 200C of the surface feature element 200 are different from the surface features of the substrate 100 and are configured to correspond to the touch function region 20R1 of the display panel 20. In some embodiments, the patterned blocks 210, 220, 230 and 240 of the patterned layer 200C are configured to correspond to the touch function region 20R1 of the display panel 20. In some embodiments, the touch function region 20R1 of the display panel 20 has a plurality of functional blocks, each of which corresponds to a touch input function (e.g., volume adjustment, light brightness adjustment, air conditioning temperature adjustment, etc.). In some other embodiments, two or more adjacent functional blocks of the touch function region 20R1 of the display panel 20 may correspond to one touch input function together. In some embodiments, the patterned blocks 210, 220, 230, and 240 of the patterned layer 200C each correspond to a functional block of the touch functional area 20R1 of the display panel 20. In some embodiments, the patterned blocks 210, 220, 230, and 240 of the patterned layer 200C each correspond to a touch input function. In some other embodiments, two or more adjacent ones of the patterned blocks 210, 220, 230, and 240 of the patterned layer 200C (for example, the patterned blocks 210 and 220) may correspond to a touch input function together.

[0040] According to some embodiments of the present disclosure, the surface features of the surface feature 200 are located above one of the regions R1 and R2, and the surface features of the surface feature 200 are different from another surface feature on the other of the regions R1 and R2 (e.g., region R2) of the substrate 100. When the regions R2 and R1 of the substrate 100 correspond to the image display region 20R2 and the touch function region 20R1 of the display panel 20, or correspond to different touch input functions of the display panel 2, the user can perceive the different regions by tactile differences without distracting the visual display panel, thereby improving the convenience of use. Furthermore, according to some embodiments of the present disclosure, when the surface feature 200 is applied to a car display, the user can better operate the touch input function by tactile perception without distracting the visual display panel, thereby improving the concentration and safety of driving.

[0041] Please refer to Figure 2A and Figure 2B , Figure 2A and Figure 2B2A and 2B according to some embodiments of the present disclosure. In some embodiments, the structure of the display device 2A and the structure of the display device 2B are similar to the display device 1, and the differences are as follows. In addition, from now on, the components that are the same or similar to the above components will use the same or similar component numbers, and the relevant descriptions of the same or similar components can be found in the above, and will not be repeated here.

[0042] like Figure 2A As shown, in some embodiments, the surface feature 200 of the display device 2A includes a patterned layer having a double-layer structure. In some embodiments, the surface feature 200 includes an adhesive layer 200A and an organic base layer 200B. In some embodiments, the adhesive layer 200A includes a pressure-sensitive adhesive (PSA), a heat-sensitive adhesive, a solvent-volatile adhesive, and / or a UV-curable adhesive. In some embodiments, the organic base layer 200B includes polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC), triacetyl cellulose (TAC), polyimide (PI), polyvinyl chloride (PVC), polypropylene (PP), cycloolefin polymer (COP), silicon oxide, silicon nitride, silicon oxynitride, or any combination thereof.

[0043] like Figure 2B As shown, in some embodiments, the surface feature 200 of the display device 2B includes a patterned layer, which includes an adhesive layer 200A and an organic base layer 200B. In some embodiments, the adhesive layer 200A and the organic base layer 200B are located on the region R2 of the substrate 100. In some embodiments, the region R2 of the substrate 100 corresponds to each functional block of the touch function region 20R1 of the display panel 20. In some embodiments, the adhesive layer 200A and the organic base layer 200B correspond to the image display region 20R2 of the display panel 20.

[0044] Please refer to Figure 3A and Figure 3B , Figure 3A is a top view of a display device 3 according to some embodiments of the present disclosure, Figure 3B is a cross-sectional view of a display device 3 according to some embodiments of the present disclosure. In some embodiments, Figure 3B is along Figure 3A In some embodiments, the structure of the display device 3 is similar to that of the display device 1, with the differences being as described below.

[0045] In some embodiments, the surface feature 200 has two different surface features (also referred to as “first surface feature” and “second surface feature”). In some embodiments, the two surface features of the surface feature 200 are located on the region R1 and the region R2 of the substrate 100, respectively.

[0046] In some embodiments, the surface feature 200 includes a patterned layer 200C (also referred to as a "first patterned layer") and a patterned layer 200D (also referred to as a "second patterned layer"). In some embodiments, the patterned layers 200C and 200D are respectively located on the region R1 and the region R2 of the substrate 100. In some embodiments, the patterned layers 200C and 200D have different surface features. In some embodiments, the patterned layer 200C may include polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC), triacetyl cellulose (TAC), polyimide (PI), polyvinyl chloride (PVC), polypropylene (PP), cycloolefin polymer (COP), or any combination thereof. In some embodiments, the patterned layer 200D may include silicon oxide, silicon nitride, silicon oxynitride, or any combination thereof. In some embodiments, the thickness of the surface feature 200 is equal to or greater than about 0.8 micrometers (μm), or equal to or greater than about 1 μm, or equal to or greater than about 1.5 μm, or equal to or greater than about 2 μm.

[0047] In some embodiments, the patterned layer 200C and the patterned layer 200D have different surface roughnesses. In some embodiments, the surface roughness difference between the surface of the patterned layer 200C and the surface of the patterned layer 200D may be equal to or greater than about 0.135 μm, or equal to or greater than about 0.15 μm. In some embodiments, the surface roughness difference between the surface 210a of the patterned block 210, the surface 220a of the patterned block 220, the surface 230a of the patterned block 230, and / or the surface 240a of the patterned block 240 and the surface 200a of the patterned layer 200D may be equal to or greater than about 0.135 μm, or equal to or greater than about 0.15 μm, or equal to or greater than about 0.18 μm, or equal to or greater than about 0.2 μm, or equal to or greater than about 0.25 μm.

[0048] In some embodiments, the patterned layer 200C and the patterned layer 200D have a surface static friction coefficient. In some embodiments, the difference in surface static friction coefficient between the surface of the patterned layer 200C and the surface of the patterned layer 200D may be equal to or greater than 0.05 μs. In some embodiments, the difference in surface static friction coefficient between the surface 210a of the patterned block 210, the surface 220a of the patterned block 220, the surface 230a of the patterned block 230, and / or the surface 240a of the patterned block 240 and the surface 200a of the patterned layer 200D may be equal to or greater than about 0.05 μs, or equal to or greater than about 0.08 μs, or equal to or greater than about 0.1 μs, or equal to or greater than about 0.15 μs.

[0049] In some embodiments, the area of ​​at least one of the patterned layer 200C and the patterned layer 200D is equal to or greater than 1 mm. 2 .

[0050] In some embodiments, two different surface features of the surface feature 200 of the optical film structure 10 are respectively located on the image display area 20R2 and the touch function area 20R1 of the display panel 20. In some embodiments, the surface features (or first surface features) of the patterned layer 200C and the surface features (or second surface features) of the patterned layer 200D of the surface feature 200 are configured to correspond to the touch function area 20R1 and the image display area 20R2 of the display panel 20. In some embodiments, the patterned blocks 210, 220, 230 and 240 of the patterned layer 200C each correspond to a functional block of the touch function area 20R1 of the display panel 20. In some embodiments, the patterned blocks 210, 220, 230 and 240 of the patterned layer 200C each correspond to a touch input function. In some other embodiments, two or more adjacent ones of the patterned areas 210 , 220 , 230 , and 240 of the patterned layer 200C (eg, the patterned areas 210 and 220 ) may correspond to one touch input function.

[0051] The following tests are conducted on the tactile perception of the patterned layer 200C and the patterned layer 200D of the optical film structure with different combinations of surface roughness and surface static friction coefficient, wherein the tactile difference is felt by the user's hand touching different surfaces. A subjective tactile degree of less than 2 indicates that the user's hand cannot clearly feel the difference, and a subjective tactile degree of equal to or greater than 2 indicates that the user's hand can clearly feel the difference. In Table 1, "HC5", "HCC-1" and "HCC-2" are all triacetyl cellulose (TAC) material layers, "GRT2" and "NC3" are all triacetyl cellulose (TAC) material layers with acrylic particles added therein, and "OC" is a silicon-containing inorganic material layer.

[0052] Table 1

[0053] Example A B C D E F G Patterned layer 200C HC5 HCC-1 HCC-2 GRT2 NC3 OC Glass Surface roughness (Ra) (μm) 0.015 0.013 0.013 0.18 0.15 0.015 0.015 Static friction coefficient (μs) 0.3 0.32 0.24 0.22 0.25 0.3 0.3 Patterned layer 200D OC OC OC OC OC OC OC Surface roughness difference (μm) 0 0.002 0.002 0.165 0.135 0 0 Static friction coefficient difference (μs) 0 0.02 0.06 0.08 0.05 0 0 Subjective touch 1 1 2 3 2 1 1

[0054] It can be seen from the results of Table 1 that in some embodiments, when the surface roughness difference is equal to or greater than 0.135 μm, the subjective tactile sensitivity can be increased to equal to or greater than 2, which means that the user's hand can already clearly feel the difference. Moreover, as the surface roughness difference increases, for example, equal to or greater than 0.165 μm, the subjective tactile sensitivity is further increased. Furthermore, in some embodiments, when the surface static friction coefficient difference is equal to or greater than 0.05 μs, even if the surface roughness difference is relatively small, the subjective tactile sensitivity can still be increased to equal to or greater than 2, which means that the user's hand can clearly feel the difference. Furthermore, as the surface static friction coefficient difference is greater, for example, equal to or greater than 0.08 μs, the subjective tactile sensitivity is further increased.

[0055] Please refer to Figure 4A and Figure 4B , Figure 4A and Figure 4B 4A and 4B according to some embodiments of the present disclosure. In some embodiments, the structure of the display device 4A and the structure of the display device 4B are similar to the display device 3, and the differences are as follows.

[0056] like Figure 4A As shown, in some embodiments, the surface feature 200 of the display device 4A includes a patterned layer, which includes an adhesive layer 200A and an organic base layer 200B and is located on the region R2 of the substrate 100. In some embodiments, the surface 200a' of the organic base layer 200B and the surface of the patterned layer 200C (e.g., surfaces 210a, 220a, 230a, and 240a) have different surface features. In some embodiments, the surface 200a' of the organic base layer 200B and the surface of the patterned layer 200C (e.g., surfaces 210a, 220a, 230a, and 240a) have different surface roughness and / or surface static friction coefficient.

[0057] like Figure 4B As shown, in some embodiments, the surface feature 200 of the display device 4B includes a patterned layer, which includes an adhesive layer 200A and an organic base layer 200B and is located on the region R1 of the substrate 100. In some embodiments, the surface 200a' of the organic base layer 200B and the surface 200a of the patterned layer 200D have different surface features. In some embodiments, the surface 200a' of the organic base layer 200B and the surface 200a of the patterned layer 200D have different surface roughness and / or surface static friction coefficient.

[0058] Please refer to Figure 5A and Figure 5B , Figure 5A and Figure 5B is a cross-sectional view of a display device 5A and a display device 5B according to some embodiments of the present disclosure. In some embodiments, the structure of the display device 5A and the structure of the display device 5B are similar to the display device 3, and the differences are as follows.

[0059] like Figure 5A As shown, in some embodiments, the surface feature 200 of the display device 5A includes a bottom layer 200E and a patterned surface structure 200F. In some embodiments, the bottom layer 200E has a top surface (e.g., surface 200a), and the patterned surface structure 200F is at least partially buried in the bottom layer 200E and exposed from the top surface of the bottom layer 200E. In some embodiments, the top surface 200a1 of the patterned surface structure 200F is substantially coplanar with the top surface (e.g., surface 200a) of the bottom layer 200E. In some other embodiments, the top surface 200a1 of the patterned surface structure 200F may protrude from the top surface (e.g., surface 200a) of the bottom layer 200E.

[0060] like Figure 5B As shown, in some embodiments, the surface feature 200 of the display device 5B includes a bottom layer 200E and a patterned surface structure 200F. In some embodiments, the patterned surface structure 200F is located on the top surface of the bottom layer 200E. In some embodiments, the difference between the height of the top surface 200a2 of the patterned surface structure 200F and the height of the top surface 200a of the bottom layer 200E is equal to or greater than about 0.3 μm, or equal to or greater than about 0.4 μm, or equal to or greater than about 0.5 μm. In some embodiments, the difference between the height of the top surface 200a2 of the patterned surface structure 200F and the height of the top surface 200a of the bottom layer 200E is less than about 5 μm, or less than about 3 μm, or less than about 1 μm.

[0061] In some embodiments, the bottom layer 200E may include silicon oxide, silicon nitride, silicon oxynitride, or any combination thereof. In some embodiments, the patterned surface structure 200F may be formed by surface treating the bottom layer 200E. In some embodiments, the patterned surface structure 200F may include a sandblasted microstructure, a 3D printing material layer, a screen printing layer, a vector printing, a UV curing adhesive layer, or any combination thereof.

[0062] Please refer to Fig. 6A and Figure 6B , Fig. 6A and Figure 6B6A and 6B according to some embodiments of the present disclosure. In some embodiments, the structure of the display device 6A and the structure of the display device 6B are similar to the display device 3, and the differences are as follows.

[0063] like Fig. 6A As shown, in some embodiments, the patterned layer 200C and the patterned layer 200D of the display device 6A have different surface heights. In some embodiments, the surface of the patterned layer 200C and the surface of the patterned layer 200D are located at different heights. In some embodiments, the difference between the surface height of the patterned layer 200C and the surface height of the patterned layer 200D is equal to or greater than about 5 μm, or equal to or greater than about 6 μm, or equal to or greater than about 8 μm, or equal to or greater than about 10 μm, or equal to or greater than about 15 μm. In some embodiments, the difference between the height of the surface 210a of the patterned block 210 and the height of the surface 200a of the patterned layer 200D is equal to or greater than about 5 μm, the difference between the height of the surface 220a of the patterned block 220 and the height of the surface 200a of the patterned layer 200D is equal to or greater than about 5 μm, the difference between the height of the surface 230a of the patterned block 230 and the height of the surface 200a of the patterned layer 200D is equal to or greater than about 5 μm, and / or the difference between the height of the surface 240a of the patterned block 240 and the height of the surface 200a of the patterned layer 200D is equal to or greater than about 5 μm.

[0064] like Figure 6B As shown, in some embodiments, the organic base layer 200B and the patterned layer 200D of the display device 6B have different surface heights. In some embodiments, the surface 200a' of the organic base layer 200B and the surface 200a of the patterned layer 200D are located at different heights. In some embodiments, the difference between the height of the surface 200a' of the organic base layer 200B and the height of the surface 200a of the patterned layer 200D is equal to or greater than about 5 μm, or equal to or greater than about 6 μm, or equal to or greater than about 8 μm, or equal to or greater than about 10 μm, or equal to or greater than about 15 μm.

[0065] Please refer to Fig. 7A and Figure 7B , Fig. 7A and Figure 7B 2 is a cross-sectional view of a display device 7A and a display device 7B according to some embodiments of the present disclosure. In some embodiments, the structure of the display device 7A and the structure of the display device 7B are similar to the display device 1 and the display device 3, and the differences are as follows.

[0066] like Fig. 7A and Figure 7BAs shown, the display device 7A and the display device 7B further include a substrate 300, which is located between the substrate 100 and the surface feature 200. In some embodiments, the substrate 300 includes an organic base layer 310 and an adhesive layer 320. In some embodiments, the organic base layer 310 includes polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polycarbonate (PC), triacetyl cellulose (TAC), polyimide (PI), polyvinyl chloride (PVC), polypropylene (PP), cyclic olefin polymer (COP), or any combination thereof. In some embodiments, the adhesive layer 320 includes a pressure-sensitive adhesive (PSA), a heat-sensitive adhesive, a solvent-volatile adhesive, and / or a UV-curable adhesive.

[0067] Please refer to Fig. 8A and Figure 8B , Fig. 8A and Figure 8B 1 is a cross-sectional view of an optical film structure 10A and an optical film structure 10B according to some embodiments of the present disclosure. In some embodiments, the optical film structure 10A and the optical film structure 10B are similar to the optical film structure 10, and the differences are as follows.

[0068] like Fig. 8A and Figure 8B As shown, in some embodiments, the optical film structure 10A and the optical film structure 10B may include a surface feature 200, a substrate 300, a release film 400, and a surface protection film 500. In some embodiments, the surface protection film 500 covers the surface feature 200. In some embodiments, the substrate 300 is attached to the release film 400 (via an adhesive layer 320). For example, the organic base layer 310 of the substrate 300 may be attached to the release film 400 via the adhesive layer 320. In some embodiments, the optical film structure 10A may be used as a replaceable optical film structure. After the release film 400 is torn off, the surface feature 200 may be attached to the display panel 20 or to the substrate 100 and the display panel 20 through the substrate 300. In some embodiments, after the surface feature 200 is attached to the display panel 20, the surface protection film 500 may be removed.

[0069] According to some embodiments of the present disclosure, when the configuration of various functional blocks of the touch function area 20R1 of the display panel 20 is changed due to factors such as system upgrades, or when the optical film structure 10 is dirty and needs to be replaced, the design of the replaceable optical film structure can greatly improve the convenience of use, reduce the cost of use, and reduce the loss and waste of materials.

[0070] In some embodiments, the material of the surface protection film 500 may be a thermoplastic resin having good transparency, mechanical strength, thermal stability, moisture barrier properties, and the like. In some embodiments, the thermoplastic resin may include a cellulose resin (e.g., triacetyl cellulose (TAC), diacetyl cellulose (DAC)), an acrylic resin (e.g., polymethyl methacrylate (PMMA), a polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cycloolefin resin, an oriented stretch polypropylene (OPP), polyethylene (PE), polypropylene (PP), a cycloolefin polymer (COP), a cycloolefin copolymer (COC), a polycarbonate (PC), or any combination thereof. In addition, the material of the surface protection film 500 may also be, for example, a thermosetting resin or an ultraviolet curing resin such as a (meth) acrylic acid series, an urethane series, an acrylic urethane series, an epoxy series, a polysiloxane series, etc. In addition, the surface protection film 500 may be further subjected to surface treatment, for example, anti-glare treatment, anti-reflection treatment, hard coating treatment, anti-static treatment, or anti-fouling treatment. In some embodiments, the thickness of the surface protection film 500 may be 5 to 90 microns, preferably 35 to 80 microns.

[0071] Please refer to Fig. 9A , Fig. 9B and Fig. 9C , Fig. 9A , Fig. 9B and Fig. 9C is a flow chart of a method for manufacturing an optical film structure 10 according to some embodiments of the present disclosure.

[0072] like Fig. 9A As shown, a substrate 100 may be provided, and a material layer may be disposed on the substrate 100. In some embodiments, the material layer includes an adhesive layer 200A' and an organic base layer 200B'. In some embodiments, the material layer including the adhesive layer 200A' and the organic base layer 200B' is adhered to the substrate 100 through the adhesive layer 200A'. In some embodiments, the substrate 100 has a region R1 and a region R2, wherein the region R1 is configured to correspond to a touch function region of a display panel to be subsequently attached.

[0073] like Fig. 9B and Fig. 9C As shown, a portion of the material layer (e.g., adhesive layer 200A' and organic base layer 200B') is removed to form the surface feature 200 on the region R1 of the substrate 100, and the region R2 of the substrate 100 is exposed. In some embodiments, a portion of the material layer can be removed by cutting with a die. In some embodiments, as Fig. 9BAs shown, the material layer can be cut along the predetermined cutting path by a wooden mold folding knife, and then the material layer above the area R2 of the substrate 100 is removed. Fig. 9C The optical film structure 10 is shown.

[0074] In some other embodiments, please refer to Figure 1A and 1B and / or Figure 5A and 5B , the surface feature 200 can be formed on one of the regions R1 and R2 of the substrate 100 through a process method. In some embodiments, the process method includes sandblasting one of the regions R1 and R2 of the substrate 100, 3D printing one of the regions R1 and R2 of the substrate 100, screen printing one of the regions R1 and R2 of the substrate 100, laminating a vector print to one of the regions R1 and R2 of the substrate 100, applying a UV-curable adhesive layer to one of the regions R1 and R2 of the substrate 100, or any combination thereof. In some embodiments, a bottom layer 200E can be formed on the substrate 100, and then the area of ​​the bottom layer 200E corresponding to one of the regions R1 and R2 of the substrate 100 is subjected to the aforementioned sandblasting, 3D printing, screen printing, laminating a vector print, applying a UV-curable adhesive layer, or any combination thereof.

[0075] According to some embodiments of the present disclosure, compared to producing the surface feature 200 by cutting, producing the patterned surface feature 200 by sandblasting, 3D printing, screen printing, lamination, applying a UV-curable adhesive layer, or any combination of the above can increase the flexibility of the structural design of the shape, size, etc. of the surface feature 200.

[0076] Please refer to Fig. 10A , Fig. 10B and Fig. 10C , Fig. 10A , Fig. 10B and Fig. 10C is a flow chart of a method for manufacturing an optical film structure 10 according to some embodiments of the present disclosure.

[0077] like Fig. 10A As shown, a substrate 100 may be provided, and a material layer 200D' may be disposed on the substrate 100. In some embodiments, the material layer 200D' comprises a material (also referred to as a "first material"). In some embodiments, the material layer 200D' may be formed on the substrate 100 by coating, deposition, or a combination thereof. In some embodiments, the substrate 100 has a region R1 and a region R2, wherein the region R1 is configured to correspond to a touch function region of a display panel to be subsequently bonded.

[0078] like Fig. 10B As shown, a portion of the material layer 200D′ may be removed to form one or more openings 200D1 . In some embodiments, the openings 200D1 expose the region R2 of the substrate 100 .

[0079] like Fig. 10C As shown, another material (also referred to as "second material") different from the material of the material layer 200D' is filled into the opening 200D1 to form patterned blocks 210, 220, 230 and 240, thereby forming the surface feature 200. In some embodiments, the second material may include a polymer material, and the second material filled into the opening 200D1 undergoes a curing process (e.g., an ultraviolet curing process or a thermal curing process) to form the patterned blocks 210, 220, 230 and 240.

[0080] Although the present disclosure is disclosed as above with the aforementioned embodiments, it is not intended to limit the present disclosure. Those with ordinary knowledge in the technical field to which the present disclosure belongs may make some changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be determined by the scope of the attached patent application. In addition, each patent application constitutes an independent embodiment, and the combination of various patent application scopes and embodiments is within the scope of the present disclosure.

[0081] Explanation of symbols

[0082] 1, 2A, 2B, 3, 4A, 4B, 5A, 5B, 6A, 6B, 7A, 7B: Display devices

[0083] 10, 10A, 10B: Optical film structure

[0084] 20: Display Panel

[0085] 20R1: Touch function area

[0086] 20R2: Image display area

[0087] 100, 300: substrate

[0088] 100a, 200a, 200a', 200a1, 210a, 220a, 230a, 240a: surface

[0089] 200: Surface features

[0090] 200A, 200A', 320: Adhesive layer

[0091] 200B, 200B', 310: Organic base layer

[0092] 200C, 200D: Patterned layer

[0093] 200D': Material layer

[0094] 200D1: Open

[0095] 200E: Bottom layer

[0096] 200F: Patterned surface structures

[0097] 210, 220, 230, 240: Patterned blocks

[0098] 400: Release film

[0099] 500: Surface protection film

[0100] 1B-1B', 3B-3B': Hatch line

[0101] R1, R2: Area

Claims

1. An optical film structure, comprising: a substrate having a first region and a second region; as well as A surface feature, which is disposed on the substrate, wherein the surface feature has a first surface feature and a second surface feature, the first surface feature is located above the first area, the second surface feature is located above the second area, and the first surface feature and the second surface feature each include a surface roughness and / or a surface static friction coefficient, Wherein: the difference in surface roughness between the first surface feature and the second surface feature is 0.135 μm to 0.165 μm; and / or the difference in surface static friction coefficient between the first surface feature and the second surface feature is 0.06 μs to 0.08 μs; and / or the difference in surface roughness between the first surface feature and the second surface feature is equal to or greater than 0.135 μm and the difference in surface static friction coefficient between the first surface feature and the second surface feature is equal to or greater than 0.05 μs; and The surface feature is located at the outermost layer of the optical film structure and is used to directly contact the user's hand. 2 . The optical film structure of claim 1 , wherein the surface feature comprises a patterned layer, and a difference between a surface height of the patterned layer and a surface height of the substrate is equal to or greater than 5 μm.

3. An optical film structure according to claim 1, wherein the surface feature comprises a first patterned layer and a second patterned layer, which are respectively located on the first area and the second area of ​​the substrate, and the first patterned layer and the second patterned layer have different surface roughness; and / or the first patterned layer and the second patterned layer have different surface static friction coefficients; and / or the first patterned layer and the second patterned layer have different surface heights.

4. An optical film structure according to claim 3, wherein the difference in surface roughness between the first patterned layer and the second patterned layer is 0.135 μm to 0.165 μm; and / or the difference in surface static friction coefficient between the first patterned layer and the second patterned layer is 0.06 μs to 0.08 μs; and / or the difference in surface height between the first patterned layer and the second patterned layer is equal to or greater than 5 μm.

5. The optical film structure according to claim 3, wherein an area of ​​at least one of the first patterned layer and the second patterned layer is equal to or greater than 1 mm 2 .

6. The optical film structure of claim 1, wherein the surface features comprise: a bottom layer having a top surface; as well as A patterned surface structure is located on the top surface of the bottom layer or is at least partially buried in the bottom layer and exposed from the top surface. 7 . The optical film structure according to claim 1 , wherein the substrate comprises an optical film, a release film, an organic base layer, or any combination thereof.

8. The optical film structure of claim 7, further comprising a surface protection film covering the surface features. 9 . The optical film structure according to claim 1 , wherein the light transmittance of the surface feature is equal to or greater than 90%; and / or the thickness of the surface feature is equal to or greater than 5 μm.

10. A display device, comprising: Display panel; as well as An optical film structure, which is arranged on the display panel, and the optical film structure comprises: a substrate having a first region and a second region; and A surface feature, which is disposed on the substrate, wherein the surface feature has a first surface feature and a second surface feature, the first surface feature is located above the first area, the second surface feature is located above the second area, and the first surface feature and the second surface feature each include a surface roughness and / or a surface static friction coefficient, Wherein: the difference in surface roughness between the first surface feature and the second surface feature is 0.135 μm to 0.165 μm; and / or the difference in surface static friction coefficient between the first surface feature and the second surface feature is 0.06 μs to 0.08 μs; and / or the difference in surface roughness between the first surface feature and the second surface feature is equal to or greater than 0.135 μm and the difference in surface static friction coefficient between the first surface feature and the second surface feature is equal to or greater than 0.05 μs; and The surface feature is located at the outermost layer of the optical film structure and is used to directly contact the user's hand.

11. The display device according to claim 10, wherein the display panel has an image display area and a touch function area, and the first surface feature of the surface feature element of the optical film structure is located above one of the image display area and the touch function area. 12 . The display device according to claim 11 , wherein the second surface feature is located on the other of the image display area and the touch function area of ​​the display panel. 13 . The display device according to claim 11 , wherein the ratio of the area of ​​the first surface feature to the total area of ​​the image display area and the touch function area of ​​the display panel is equal to or less than 50%.

14. A display device according to claim 10, wherein the substrate comprises an optical film, an organic base layer, or a combination thereof; and / or the transmittance of the surface feature is equal to or greater than 90%; and / or the thickness of the surface feature is equal to or greater than 5 μm.

15. A method for manufacturing an optical film structure, comprising: Providing a substrate having a first area and a second area, wherein the first area is configured to correspond to a touch function area of ​​a display panel; as well as forming a surface feature on one of the first region and the second region of the substrate, wherein the surface feature has a first surface feature and a second surface feature, the first surface feature is located above the first region, the second surface feature is located above the second region, and the first surface feature and the second surface feature each include a surface roughness and / or a surface static friction coefficient, Wherein: the difference in surface roughness between the first surface feature and the second surface feature is 0.135 μm to 0.165 μm; and / or the difference in surface static friction coefficient between the first surface feature and the second surface feature is 0.06 μs to 0.08 μs; and / or the difference in surface roughness between the first surface feature and the second surface feature is equal to or greater than 0.135 μm and the difference in surface static friction coefficient between the first surface feature and the second surface feature is equal to or greater than 0.05 μs; and The surface feature is formed on the outermost layer of the optical film structure and is used to directly contact the user's hand.

16. The method for manufacturing an optical film structure according to claim 15, wherein forming the surface feature comprises: Disposing a material layer on the substrate; as well as A portion of the material layer is removed to form the surface feature on the one of the first region and the second region of the substrate and expose the other of the first region and the second region of the substrate.

17. A method for manufacturing an optical film structure according to claim 15, wherein the surface feature is formed on one of the first area and the second area of ​​the substrate by a process method, and the process method includes sandblasting, 3D printing, screen printing, laminating vector printing to the substrate, applying a UV-curable adhesive layer to the substrate, or any combination of the above.

18. The method for manufacturing an optical film structure according to claim 15, wherein forming the surface feature comprises: Disposing a material layer on the substrate, wherein the material layer includes a first material; removing a portion of the material layer to form at least one opening to expose one of the first region and the second region of the substrate; as well as A second material is filled into the at least one opening to form the surface feature, wherein the second material is different from the first material.

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