CN113267836A

CN113267836A - Surface protection film, optical film and display device

Info

Publication number: CN113267836A
Application number: CN202110480473.6A
Authority: CN
Inventors: 郭中竣; 沈慧婷
Original assignee: Sumika Technology Co Ltd
Current assignee: Sumika Technology Co Ltd
Priority date: 2020-11-03
Filing date: 2021-04-30
Publication date: 2021-08-17
Anticipated expiration: 2041-04-30
Also published as: TWI741863B; TW202219559A; CN113267836B

Abstract

The embodiment of the invention provides a surface protection film, an optical film and a display device. The surface protection film is provided with a body area and at least one holding area positioned on one side of the body area, and the holding area is used for stripping off at least one antibacterial layer. The embodiment of the invention also provides an optical film, which comprises a polarizing plate and a surface protection film arranged on the polarizing plate. The embodiment of the invention also provides a display device comprising the surface protection film.

Description

Surface protection film, optical film and display device

Technical Field

The present disclosure relates to a surface protection film, and more particularly, to a long-lasting antibacterial protection film.

Background

In order to satisfy the demand for the display panel having the antibacterial function, improvements are made on the display which is frequently touched by fingers. For example, the surface of the display is added with an antibacterial material, however, with the increase of antibacterial awareness, the existing method cannot meet the requirement of aging, and cannot meet the aging of the display for three to five years.

Disclosure of Invention

Embodiments of the present invention provide a surface film comprising at least two stacked antimicrobial layers. The surface protection film is provided with a body area and at least one holding area positioned on one side of the body area, and the holding area is used for stripping off at least one antibacterial layer.

The embodiment of the invention provides an optical film, which comprises a polarizing plate and the surface protection film arranged on the polarizing plate. The adhesion between the respective layers in the surface protective film gradually decreases with distance from the polarizing plate.

The embodiment of the invention also provides a display device which comprises a display panel and the optical film. The display panel comprises a display area and a frame area surrounding the display area. The optical film is arranged on the display area of the display surface and part of the frame area. The grip region in the optical film is disposed in the frame region.

The embodiment of the invention also provides a display device which comprises a display panel and the surface protection film. The display panel comprises a display area and a frame area surrounding the display area. The surface protection film is arranged on the display area of the display surface and part of the frame area. The holding area in the surface protection film is arranged in the frame area.

Drawings

So that the manner in which the features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings, in which:

FIG. 1 is a perspective view of an optical film according to some embodiments of the present disclosure;

FIG. 2 is a perspective view of an optical film after being cut according to some embodiments of the present disclosure;

FIG. 3 is a cross-sectional view of the optical film taken along section line A-A' of FIG. 2, according to some embodiments of the present disclosure;

FIGS. 4-7 are top views of various layers of the optical film of FIG. 2, respectively, according to some embodiments of the present disclosure;

FIG. 8 is a perspective view of the optical film after the release film is removed and before the optical film is disposed on the display panel according to some embodiments of the invention;

FIG. 9 is a perspective view of a display device according to some embodiments of the present invention;

FIG. 10 is a cross-sectional view of the display device taken along section line B-B' of FIG. 9 according to some embodiments of the present invention;

FIG. 11 is a cross-sectional view of the display device along the cross-sectional line C-C' of FIG. 9 according to some embodiments of the present invention;

FIG. 12 is a cross-sectional view of a display device with an appearance member according to another embodiment of the present invention;

FIG. 13 is a perspective view of the display device shown in succession to FIG. 9 with the antimicrobial layer removed, in accordance with some embodiments of the present invention;

FIG. 14 is a cross-sectional view of the display device taken along section line D-D' of FIG. 13 according to some embodiments of the present invention;

FIG. 15 is a perspective view of the display device shown in succession to FIG. 13 with another antibacterial layer removed, according to some embodiments of the present invention;

FIG. 16 is a cross-sectional view of the display device taken along section line E-E' of FIG. 15 according to some embodiments of the present invention;

FIG. 17 is a perspective view of the display device shown in succession to FIG. 15 with another antibacterial layer removed, according to some embodiments of the present invention;

FIG. 18 is a cross-sectional view of the display device taken along section line F-F' of FIG. 17, according to some embodiments of the present invention.

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be noted that, in accordance with standard practice in the industry, the various features are not drawn to scale and are merely illustrative. In fact, the dimensions of the elements may be arbitrarily expanded or reduced to clearly illustrate the features of the embodiments of the present invention.

[ notation ] to show

10, 10' optical film

10B body region

10G1,10G2,10G3 grip area

100 polarizing plate

200 surface protective film

210,220,230 antimicrobial layer

300 release film

500 display device

510 display area

520 frame area

600 appearance piece

1000 display device

K at the predetermined cutting position

S11, S12, S21, S22, S31, S32 slits

A-A ', B-B', C-C ', D-D', E-E ', F-F': cross section

x, y, z directions

Detailed Description

The following provides various embodiments or examples for implementing different elements of the invention. References in the specification to a first element being formed on a second element may include embodiments in which the first and second elements are formed in direct contact, and may also include embodiments in which additional elements are formed between the first and second elements such that the first and second elements are not in direct contact. In addition, embodiments of the present invention may use repeated reference numerals in many instances. These repetitions are merely for simplicity and clarity and do not represent a particular relationship between the various embodiments and/or configurations discussed.

Spatially relative terms, such as "front," "back," "above," "below," "above … …," "below … …," and the like, encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. When the device is turned to other orientations (rotated 90 degrees or other orientations), then the spatially relative descriptors used herein should be interpreted as such with respect to the rotated orientation.

As used herein, the term "about", "about" or "substantially" generally means within 20%, preferably within 10%, and more preferably within 5%, or within 3%, or within 2%, or within 1%, or within 0.5% of a given value or range. It should be noted that the amounts provided in the specification are approximate amounts, i.e., the meanings of "about", "about" and "about" may be implied without specific recitation of "about", "about" and "about".

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The surface protection film provided by the embodiment of the invention can prolong the antibacterial aging by more than two superposed antibacterial layers, and in addition, through the design of the grip area in the surface protection film, when the antibacterial effect of the upper antibacterial layer is poor, a consumer can peel the grip area and the upper antibacterial layer to expose the lower antibacterial layer, so that the effect of prolonging the antibacterial aging is achieved and the convenience is also taken into consideration. In some embodiments, the surface protection film provided by the embodiments of the present invention can be directly attached to the surface of the display panel to provide an antibacterial effect.

Referring to fig. 1, fig. 1 is a perspective view illustrating an optical film 10 according to some embodiments of the present disclosure. It should be noted that the dimensions of the optical film 10 are not drawn to scale to highlight features. In fig. 1, the first direction is a direction x, the second direction is a direction y, and the third direction is a direction z.

As shown in fig. 1, the optical film 10 includes a polarizing plate 100, a surface protection film 200 disposed on the polarizing plate 100, and a release film 300 disposed under the polarizing plate 100. In the embodiment shown in fig. 1, the surface protection film 200 includes three antibiotic layers, which are respectively referred to as a first antibiotic layer 210 located at the uppermost layer, a second antibiotic layer 220 located below the first antibiotic layer 210, and a third antibiotic layer 230 located at the lowermost layer.

It should be noted that the number of the antibacterial layers is arbitrarily increased or decreased depending on the desired use time, as the thickness range allows (described in detail later).

In some embodiments, the polarizer 100 can control the polarization direction of a specific light beam, so that the light source generates a phase difference between an electric field and an electric field, and the light source is in a bright and dark state when attached to a panel to display subtitles or patterns.

In some embodiments, the polarizer 100 includes a polarizing film, which may be a polyvinyl alcohol (PVA) resin film, which may be prepared by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include a homopolymer of vinyl acetate, i.e., polyvinyl acetate, and a copolymer of vinyl acetate and other monomers copolymerizable with vinyl acetate.

In some embodiments, the polarizer 100 further includes at least one protective film, which may be a single-layer or multi-layer structure. The material of the protective film may be, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, and the like. The thermoplastic resin may include a cellulose resin (e.g., triacetate cellulose (TAC)), a cellulose Diacetate (DAC)), an acrylic resin (e.g., poly (methyl methacrylate), PMMA), a polyester resin (e.g., polyethylene terephthalate (PET), polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cycloolefin resin, oriented-stretched polypropylene (OPP), Polyethylene (PE), polypropylene (PP), a cycloolefin polymer (COP), a cycloolefin copolymer (COC), a material of the cycloolefin copolymer (COC), or any combination thereof, in addition to which, for example, a (meth) acrylic, a urethane protective film, an acrylic urethane, an epoxy, a silicone-based, or other thermosetting resin or a silicone-based resin, the protective film may be further subjected to a surface treatment such as an anti-glare treatment, an anti-reflection treatment, a hard coat treatment, a charge prevention treatment, or an anti-stain treatment. In some embodiments, the polarizer 100 is a multi-layer structure including a polyvinyl alcohol film and protective layers attached to both sides of the polyvinyl alcohol film.

In some embodiments, the polarizer 100 has a thickness of 77 to 190 μm.

In some embodiments, the surface protection film 200 is used to protect the surface of the polarizer 100, so that the polarizer 100 is not easily brittle and shrinkable, and also blocks the optical effect from moisture, and also provides different surface treatment functions. In some embodiments, the material of the surface protection film 200 is a thermoplastic resin material having excellent transparency, mechanical strength, and thermal stability. Examples include a group consisting of Triacetylcellulose (TAC), Polymethylmethacrylate (PMMA), Polyethyleneterephthalate (PET), polypropylene (PP), Cyclic Olefin Polymer (COP), Polycarbonate (PC), or any combination thereof.

In some embodiments, the surface protection film 200 may include antibacterial ions as the antibacterial layer, wherein the antibacterial ions may be zinc ions or silver ions, wherein the antibacterial ions may be coated on the surface of the antibacterial layer. The cell membrane can be destroyed and solidified by the combination of zinc ions and/or silver ions with the cell membrane, enzyme proteins, etc., so that the bacterial reproduction can be inhibited by interfering with the nutrient uptake of the cells. In some embodiments, antibacterial ions may also be added to the surface of the polarizing plate 100 to further prolong the antibacterial time.

In some embodiments, multiple continuous antibacterial films may be repeatedly attached to the polarizer roll to form an optical roll, and then the optical roll is cut into optical films 10 with a specific size and number. In some embodiments, a sheet-shaped polarizer 100 may be formed first, and then a plurality of antibacterial layers are attached to form the sheet-shaped optical film 10.

In some embodiments, the stacked antibacterial layers in the optical film 10 may have the same or different properties, such as the same or different silver ion and/or zinc ion concentrations, the same or different thicknesses, the same or different materials, and so on, according to actual requirements.

In some embodiments, the antibacterial ions are fixed on the upper surface of the antibacterial layer (the surface far from the polarizer 100), so that the other

antibacterial layers

220 and 230 disposed under the uppermost antibacterial layer 210 can maintain the original antibacterial ion concentration without being exposed to the air. That is, even when the uppermost antibacterial layer 210 has no antibacterial effect, the antibacterial effect can be extended by exposing the lower

antibacterial layer

220 or 230 to the air after peeling off the upper antibacterial layer 210.

In some embodiments, an adhesive layer (not shown) is disposed between the polarizer 100 and the antibacterial layer and/or between the stacked antibacterial layers for bonding the two layers. In some embodiments, the adhesive layer includes a Pressure Sensitive Adhesive (PSA), a heat sensitive adhesive, a solvent volatile adhesive, and a UV curable adhesive. In some embodiments, the pressure sensitive adhesive comprises natural rubber, synthetic rubber, styrenic block copolymers, (meth) acrylic block copolymers, polyvinyl ethers, polyolefins, and poly (meth) acrylates. In some embodiments, (meth) acrylic (or acrylate) refers to both acrylic and methacrylic. In other embodiments, the pressure sensitive adhesive comprises (meth) acrylates, rubbers, thermoplastic elastomers, silicones, urethanes, and combinations thereof. In some embodiments, the pressure sensitive adhesive is based on a (meth) acrylic pressure sensitive adhesive or on at least one poly (meth) acrylate.

In some embodiments, the thicknesses of the antibacterial layers 210,220 and 230 are the same and are all 50-100 μm, such as 55 μm or 90 μm. In the case where the coating of the antibacterial ions is too thin, the number of the antibacterial ions is too small, the antibacterial aging of each antibacterial layer is too short, and the frequency of replacing the polarizing plate is increased by consumers due to insufficient antibacterial effect. In addition, the use of an excessively thin antimicrobial layer results in a decrease in the overall optical film thickness, and a problem of poor adhesion is likely to occur when polarizing plates are attached to a panel factory. In the case where the antibacterial layer is too thick, bubbles are easily generated at a long distance when the optical film is polished, and thus separation between film layers is easily generated during the process, thereby reducing antibacterial aging.

In addition, the antibacterial layers 210,220 and 230 may be further subjected to surface treatment, such as anti-glare treatment, anti-reflection treatment, hard coating treatment, electrification preventing treatment, anti-staining treatment, and the like.

In some embodiments, the thickness of the surface protection film 200 (including a plurality of antibacterial layers) and the total thickness of the polarizing plate 100 are not more than 1 mm. In some embodiments, after the films are bonded, the edge of the optical film is polished to a flat surface by a polishing process. By limiting the total thickness, the phenomenon of peeling between the layers due to bubbles generated at the edge of the optical film during polishing can be reduced, and the optical film can be prevented from exceeding the height of the appearance member (not shown) when the optical film is subsequently arranged on the display panel (not shown).

In some embodiments, the ratio of the thickness of the surface protection film 200 (including the antibacterial layers 210,220, and 230) to the thickness of the polarizer is 0.3-12; the sum of the thicknesses of the optical films can be between 180 and 1000 mu m; preferably 180 to 650 μm, and the number of the antibacterial layers may be 2 to 16, and generally, the single antibacterial layer has a time effect of about 1 to 2 years, and considering about 3 to 5 years of the retention time of the display device, the number of the antibacterial layers is preferably 2 to 5, and more preferably 3 to 5. Thereby preventing the individual layers in the optical film from peeling off during grinding. Examples of the thickness of one antibacterial layer and two or more antibacterial layers are shown in tables 1 and 2:

[ Table 1]

[ Table 2]

In some embodiments, the release film 300 serves to temporarily protect the polarizing plate 100 from damage or contamination. In some embodiments, the material of the release film 300 may be polyethylene terephthalate (PET), polybutylene terephthalate, polycarbonate, polyaryl ester, polyester resin, olefin resin, cellulose acetate resin, acrylic resin, Polyethylene (PE), polypropylene (PP), cyclic olefin resin, or a combination thereof.

In some embodiments, the release film has a thickness of 5 to 60 μm, for example 38 μm. When the thickness exceeds 60 μm, bubbles tend to be generated between the upper film layers at a long distance during polishing of the end face of the optical film, and the film layers are peeled off due to insufficient adhesion. When the thickness is less than 5 μm, it is difficult to effectively protect the inner film layer thereof.

In general, as the thickness of the optical film increases, bubbles generated at the time of polishing are farther from the edge of the optical film. That is, bubbles are easily generated at the far edge of the optical film layer. Examples of thicknesses of the optical films (including release films) are shown in table 3:

[ Table 3]

The optical film manufactured by the thickness of table 2 has bubbles generated when the end face of the optical film is polished to be about 30 to 50 μm away from the optical film, which is much less than 500 μm, and thus it is ensured that the bubbles fall on the non-display area after being attached to the panel.

When the antibacterial layer on the uppermost layer loses the antibacterial effect, the antibacterial layer on the uppermost layer needs to be stripped. The embodiment of the invention improves the convenience and the reliability of film tearing by adjusting the adhesive force of the adhesive layers among the films in the optical film and the special design of the holding area.

First, the description will be made for changing the adhesion of the adhesive layer between the film layers in the optical film. Each of the films in the optical film gradually decreases as it goes away from the polarizing plate 100. That is, the adhesive force between the antibacterial layer at the lowermost layer and the polarizing plate is greater than the adhesive force between any two antibacterial layers. Thereby reducing the problem of tearing staggered layers and preventing the problem of functional failure caused by tearing the film layer at the bottommost layer.

In the embodiment of fig. 1, the relationship between the adhesion forces of the polarizer 100, the antibacterial layers 210,220 and 230 can be shown as the following formula (1):

F_100-230>F_230-220>F_220-210…(1)

to achieve different adhesion between the layers, the surface roughness can be increased by performing plasma treatment on the surface of the antibacterial layer before stacking, so that the adhesive layer can be attached more easily. For example, plasma treatment with longer time or stronger strength can be applied to the surface of the polarizer 100 or the surface of the antibacterial layer 230 to make the surface have higher roughness, so as to generate larger adhesion force between the two surfaces; conversely, the surface of the antibacterial layer 210 or the surface of the antibacterial layer 220 may be treated with plasma for a short time or with a weak strength, so that the surface has a low roughness and the surfaces thereof have a low adhesion.

In other embodiments, the adhesion between the surface of the antibacterial layer and the adhesive layer can be increased by reducing the proportion of the surface antifouling treatment of the antibacterial layer. For example, when the anti-fouling ratio of the antimicrobial layer 210 is 100%, the

antimicrobial layers

220 and 230 can be adjusted to 80% and 60%, respectively, to increase the roughness and make the surface rougher, thereby increasing the adhesion of the adhesive layer.

In some embodiments, the adhesion between the other film layers is illustrated based on the adhesion between the

antibacterial layers

220 and 210 as shown in table 4:

[ Table 4]

In some embodiments, the adhesion between the various layers in the optical film is between 0.01N/25mm and 0.3N/25 mm. When the adhesion is too small, the film layer may be easily peeled off during the subsequent bonding with the panel. When the adhesive force is too large, it is difficult to remove the respective antibiotic layers.

In some embodiments, the difference between the adhesive force between the lowermost antibacterial layer and the polarizing plate and the adhesive force between any two antibacterial layers is 0.04N/25mm to 0.29N/25 mm. When the difference is too small, a problem of tearing off the layers (e.g., tearing off the multiple layers) is easily generated. When the difference is too large, the antibacterial layer of the bottom layer is difficult to tear.

In some embodiments, as shown in table 3, in addition to the measurement of the adhesion, the ease of tearing between the layers of film can also be observed through the number of times of tearing by a person. For example, the number of tearing times is 5 or more, and it is considered that it is difficult to tear; the tearing frequency is 2-4, and the paper can be regarded as common; the number of tearing times was 2 or less, and the article was judged to be easily torn.

Next, the design of the grip region will be described. The film layer in the optical film is divided into a body area and a holding area by the cutting tool, the antibacterial layer on the uppermost layer is stripped by the holding area, the problem of layer splitting can be prevented, and the problem of functional failure caused by tearing the film layer on the bottommost layer can also be avoided.

First, as shown in fig. 1, the optical film 10 is cut at a predetermined cut K on one side of the optical film by a cutting tool, and the optical film shown in fig. 2 may be formed.

In some embodiments, the polarizing plate web may be cut by die stamping, laser cutting, circular knife cutting, or the like. In some embodiments, the depth and location of the pre-cut may be set in the cutting unit to facilitate cutting all of the predetermined cuts K at the same time.

In fig. 2, one side of the optical film 10 is cut into three grip regions, a first grip region 10G1, a second grip region 10G2, and a third grip region 10G 3. Here, the cut portion forms a slit S. In addition, the uncut region is the body region 10B.

In this embodiment, the first grip region 10G1, the second grip region 10G2, and the third grip region 10G3 are adjacently disposed (adjacently disposed in the X direction) along one side of the body region 10B. In this embodiment, the slits S11 and S12 on the adjacent two sides of the first grip region 10G1 have the same height. As can be seen from fig. 2, the slits S11 and S12 at both sides of the first grip region 10G1 adjacent thereto pass through the surface protective film 200 from the bottom of the optical film 10 until the bottom surface of the first antibiotic layer 210 is exposed, so that the first grip region 10G1 is connected only to the first antibiotic layer 210 and the first antibiotic layer 210 can be peeled off later.

Similarly, the slits S21 and S22 (not shown in fig. 2, refer to fig. 4) on two adjacent sides of the second grip region 10G2 also have the same height, however, the slits S21 and S22 on two adjacent sides of the second grip region 10G2 penetrate through the surface protection film 200 from the bottom of the optical film 10 until the bottom surface of the second antibacterial layer 220 is exposed, so that the second grip region 10G2 is connected to the first antibacterial layer 210 through the second antibacterial layer 220, and the second antibacterial layer 220 can be stripped off later.

Similarly, the slits S31 and S32 (not shown in fig. 2, refer to fig. 4) on two adjacent sides of the third grip region 10G3 also have the same height, however, the bottoms of the optical films 10 of the slits S31 and S32 on two adjacent sides of the third grip region 10G3 penetrate through the release film 300 and the polarizing plate 100 until the bottom surface of the third antibacterial layer 230 is exposed, so that the third grip region 10G3 is connected to the first antibacterial layer 210 through the third antibacterial layer 230 and the second antibacterial layer 220, and the third antibacterial layer 230 can be peeled off later.

As can be seen from the above, in the third direction (direction z), the slits S11 and S12 are higher than the slits S21 and S22, and the slits S21 and S22 are also higher than the slits S31 and S32. Further, the slits S11, S21, and S31 do not overlap each other.

Referring to FIG. 3, FIG. 3 is a cross-sectional view of the optical film taken along the cross-sectional line A-A' of FIG. 2 according to some embodiments of the present disclosure.

In the embodiment of fig. 3, slot S11 separates first grip region 10G1 from second grip region 10G2, slot S21 separates second grip region 10G2 from third grip region 10G3, and slot S31 separates third grip region 10G3 from body region 10B.

In this embodiment, the first grip region 10G1, the second grip region 10G2, and the third grip region 10G3 have widths W1, W2, and W3, respectively. Widths W1, W2, and W3 are greater than or equal to 1mm in some embodiments. When the thickness is less than 1mm, the lower film layer (e.g., the polarizer 100 or the release film 300) in the grip region is easily peeled off to cause the sticking problem.

FIGS. 4-7 are top views of the optical film of FIG. 2, respectively, according to some embodiments of the present disclosure.

Please refer to fig. 4, which is a top view of the uppermost antibacterial layer 210. In fig. 4, the first grip region 10G1 is located at a corner of one side (+ Y direction side) of the antibiotic layer 210, and the antibiotic layer 210 may be subsequently peeled off by the first grip region 10G 1. Further, in fig. 4, the first grip region 10G1 is connected with the body region 10B. The uppermost antibacterial layer 210 is not cut by the cutting knife and thus has only one area.

Referring next to fig. 5, a top view of the antibiotic layer 220 is shown. In fig. 5, the first grip region 10G1 is also located at a corner of one side of the antibiotic layer 220, and the second grip region 10G2 is located at the-x direction side of the first grip region 10G 1. In fig. 5, first grip region 10G1 is spaced from body region 10B by slits S11 and S12, and second grip region 10G2 is connected to body region 10B. In addition, the antibacterial layer 220 may be subsequently peeled off through the second grip region 10G 2. The second antibacterial layer 220 cut by the cutting knife is divided into two regions by the slits S11 and S12.

Referring next to fig. 6, a top view of the antibiotic layer 230 is shown. In fig. 6, the first grip region 10G1 is also located at a corner of one side of the antibiotic layer 220, the second grip region 10G2 is also located at the-X direction side of the first grip region 10G1, and the third grip region 10G3 is located at the-X direction side of the second grip region 10G 2. In fig. 6, first grip region 10G1 is spaced from body region 10B by slits S11 and S12, second grip region 10G2 is spaced from body region 10B by slits S21 and S22, and third grip region 10G3 is connected to body region 10B. In addition, the antimicrobial layer 230 may be subsequently peeled off through the third grip region 10G 3. The third antibacterial layer 230 cut by the cutting knife is divided into three regions by the slits S11 and S12, and S21 and S22.

Next, fig. 7 is a top view of the polarizing plate 100. Similar to fig. 6, in fig. 7, third grip region 10G3 is spaced from body region 10B by slits S31 and S32. In addition, different grip areas on the polarizer 100 are used to strip the antibacterial layer on the different layers. The fourth layer of polarizer 100 cut by the cutting tool is divided into four regions by the slits S11 and S12, S21 and S22, and S31 and S32.

From the above, the number of areas is associated with the number of antibiotic layers. In some embodiments, the difference between the area number of the polarizer and the area number of any one of the antibacterial layers is greater than or equal to 1, so that different antibacterial layers can be stripped by using different lifting areas. For example, the polarizing plate 100 in fig. 7 has four regions, and the antibacterial layers 210,220 and 230 in fig. 4-6 have one, two and three regions, respectively, so that the difference between the number of regions of the polarizing plate 100 and the antibacterial layers 210,220 and 230 is 3, 2 and 1, respectively.

It should be noted that the top view (not shown) of the release film 300 is similar to the top view of the polarizer 100, and is not repeated herein.

Next, fig. 8 is a perspective view illustrating the optical film after the release film is removed and before the optical film is disposed on the display panel according to some embodiments of the invention, and fig. 9 is a perspective view illustrating the display device according to some embodiments of the invention.

First, the display device 1000 includes a display panel 500 including a display area 510 and a frame area 520. In addition, the release film 300 is peeled off from the optical film 10, and the optical film 10' in fig. 8 can be obtained. Next, the grip region of the optical film 10 'in fig. 8 is aligned with the frame region 520 of the display panel 500, and the optical film 10' is attached to the display panel 500, so that the display device 1000 shown in fig. 9 can be obtained. In fig. 9, the portions of the display panel 500 not adhered by the optical film 10' are all located in the frame region 520, and thus the display effect is not affected. It should be noted that the dimensions of the various components in the display device 1000 are also not drawn to scale to highlight features.

In some preferred embodiments, the display panel 500 is a medical display panel, and thus has a high requirement for antibacterial effect. In some embodiments, the display device 1000 is a display for clinical monitoring, a display for surgery, a display for diagnosis, a display for ultrasound, a display for dentistry, and the like.

Next, FIG. 10 is a cross-sectional view of the display device along the line B-B 'of FIG. 9 according to some embodiments of the present invention, and FIG. 11 is a cross-sectional view of the display device along the line C-C' of FIG. 9 according to some embodiments of the present invention.

In fig. 10, the display panel 500 is positioned at the bottom surfaces of the slits S11, S21, and S31. In addition, the optical films 10' in fig. 10 are all located in the frame region 520, and particularly, the grip regions 10G1,10G2 and 10G3 are also located in the frame region 520, so that even if the polarizing plate 100 has a slit, the display effect is not affected.

In fig. 11, the optical film 10' is located in the display area 510 and a portion of the frame area 520. It should be noted that the slit S12 is still located in the frame region 520, and therefore does not affect the display effect.

In other embodiments, the display device 500 further comprises an appearance piece 600 disposed along the frame region 520, as shown in fig. 12. In fig. 12, the edge of the exterior member 600 is flush with the edge of the display panel 500.

In some embodiments, the thickness (or height) of the appearance 600 is greater than the thickness (or height) of the optical film 10 'in the direction z to prevent the optical film 10' from protruding from the surface of the appearance 600.

In some embodiments, in the direction y, the width L of the optical film 10' in the frame region 520 on one side is less than or equal to the distance D from the exterior member 600 to the frame region 520. That is, in the direction y, the side of the optical film 10' having the slit S12 is spaced apart from or flush with the exterior member 600. Thereby, the optical film 10 'is prevented from straddling the top surface of the exterior member 600, and the optical film 10' is prevented from being uneven and easily peeling between the film layers.

In some embodiments, the width L of the optical film 10' in the frame region 520 of one side is greater than or equal to 1mm in the direction y. When the thickness is less than 1mm, the problem that the antibacterial layer is difficult to peel off is easily caused.

In some embodiments, the material of the appearance 600 may include glass, plastic, metal, stainless steel, etc., such as aluminum alloy. In some embodiments, the appearance 600 may list, for example, a frame or the like.

Next, fig. 13 is a perspective view illustrating the display device with one antibacterial layer removed, which is subsequent to fig. 9, according to some embodiments of the present invention, and fig. 14 is a cross-sectional view illustrating the display device taken along a cross-sectional line D-D' of fig. 13, according to some embodiments of the present invention.

When the first antibacterial layer 210 has lost antibacterial efficacy, the first antibacterial layer 210 may be peeled off through the first grip region 10G1 in fig. 9, as shown in fig. 13. The optical film 10' in fig. 13 only leaves the second grip region 10G2 and the third grip region 10G3 on one side of the body region 10B.

In detail, referring to fig. 14, the first grip region 10G1 is peeled off from the display panel 500 along with the first antibacterial layer 210, so that only the remaining slits S21 and S31 exist in the optical film 10'.

Next, fig. 15 is a perspective view illustrating the display device of fig. 13 with another antibacterial layer removed, according to some embodiments of the present invention, and fig. 16 is a cross-sectional view of the display device along the section line E-E' of fig. 15, according to some embodiments of the present invention.

When the second antimicrobial layer 220 also loses antimicrobial efficacy, the second antimicrobial layer 220 can be peeled away through the second gripping area 10G2 in fig. 13, as shown in fig. 15. The optical film 10' in fig. 15 has only the third grip region 10G3 left on one side of the body region 10B.

In detail, referring to fig. 16, the second grip region 10G2 is peeled off from the display panel 500 along with the second antibacterial layer 220, so that only the remaining slit S31 exists in the optical film 10'.

Next, fig. 17 is a perspective view illustrating the display device following fig. 15 with another antibacterial layer removed, according to some embodiments of the present invention, and fig. 18 is a cross-sectional view of the display device taken along the cross-sectional line F-F' of fig. 17, according to some embodiments of the present invention.

When the third antibacterial layer 230 also loses antibacterial efficacy, the third antibacterial layer 230 may be peeled off through the third grip region 10G3 in fig. 15, as shown in fig. 17. The optical film 10' in fig. 17 leaves only the body region 10B.

In detail, in fig. 17, the third grip region 10G3 is peeled off from the display panel 500 along with the third antibacterial layer 230, so that only the polarizing plate 100 is left on the display panel 500.

In some embodiments, after the antibacterial layer has been completely stripped from the optical film, the antibacterial time can be still extended because the polarizing plate is also subjected to antibacterial treatment during the manufacturing process.

In summary, the optical film and the display device provided by the embodiments of the invention can extend the antimicrobial time period by more than two stacked antimicrobial layers. And the problem of tearing wrong film layers is reduced by changing the adhesive force of each film layer in the optical film or the design of the holding area. Therefore, the antibacterial time-effect can be prolonged through the embodiment of the invention, and the user is further protected from the invasion of bacteria and the like.

The foregoing outlines several embodiments so that those skilled in the art may better understand the aspects of the present embodiments. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent processes and structures do not depart from the spirit and scope of the present invention, and that they may make various changes, substitutions and alterations herein without departing from the spirit and scope of the present invention.

Claims

1. A surface protective film, comprising: at least two superposed antibacterial layers, wherein the surface protective film is provided with a body area and at least one holding area positioned on one side of the body area, and the holding area is used for stripping off the at least one antibacterial layer.

2. The surface protection film according to claim 1, wherein the grip region comprises a first grip region and a second grip region, wherein the first grip region and the second grip region are disposed adjacent to each other along a side of the body region, and wherein the surface protection film comprises a first antibacterial layer and a second antibacterial layer, wherein the first antibacterial layer is disposed on the second antibacterial layer, wherein the first grip region is used for stripping the first antibacterial layer and the second grip region is used for stripping the second antibacterial layer.

3. The surface protective film according to claim 2, wherein a first slit is formed between the first grip region and the second grip region, and the first slit penetrates the surface protective film from the bottom of the surface protective film to expose the bottom surface of the first antibacterial layer.

4. The surface protection film according to claim 3, wherein the surface protection film further comprises a third antibacterial layer under the second antibacterial layer, and the grip region further comprises a third grip region for peeling off the third antibacterial layer, wherein a second slit is formed between the second grip region and the third grip region, and the second slit penetrates the surface protection film from the bottom of the surface protection film to expose the bottom surface of the second antibacterial layer.

5. The surface protective film according to claim 2, wherein the first grip region is connected only to the first antibacterial layer; and/or wherein the second holding area is connected with the first antibacterial layer and the second antibacterial layer.

6. The surface protective film according to claim 1, wherein the length of the grip region is 1mm or more.

7. The surface protective film according to any one of claims 1 to 6, comprising 2 to 16 stacked antibacterial layers; and/or the thickness of each antibacterial layer is the same and is 50-100 μm.

8. An optical film, comprising:

a polarizing plate; and

the surface-protective film according to any one of claims 1 to 7, which is disposed on the polarizing plate, wherein the adhesive force between the respective layers of the surface-protective film gradually decreases with distance from the polarizing plate.

9. The optical film according to claim 8, wherein the ratio of the thickness of the surface protective film to the thickness of the polarizer is 0.3 to 12; and/or the thickness of the surface protection film and the thickness of the polarizing plate are not more than 1 mm.

10. The optical film according to claim 8, wherein the difference between the adhesion between the antibacterial layer at the lowermost layer of the surface protective film and the polarizing plate and the adhesion between any two antibacterial layers of the surface protective film is 0.04N/25mm to 0.29N/25 mm.

11. The optical film according to claim 8, wherein the adhesion between the antibacterial layer at the lowermost layer of the surface protective film and the polarizing plate or the adhesion between any two antibacterial layers of the surface protective film is 0.01N/25mm to 0.3N/25 mm.

12. A display device, comprising:

a display panel including a display region and a frame region surrounding the display region; and

the optical film according to any one of claims 8 to 11, disposed on the display region and a portion of the frame region of the display panel, wherein the grip region in the optical film is disposed in the frame region.

13. The display device according to claim 12, further comprising a appearance member disposed along an edge of the frame region, wherein a thickness of the appearance member is greater than a thickness of the optical film; and/or the distance from the frame area to the appearance piece is larger than or equal to the width of the optical film in the frame area.

14. A display device, comprising:

the surface protection film according to any one of claims 1 to 7, disposed on the display region and a portion of the frame region of the display panel, wherein the grip region of the surface protection film is disposed in the frame region.