Protective glass film

Abstract

To provide a protective glass film that protects the monitor screen of a mobile terminal from everyday scratches and strong external impacts and prevents damage. [Solution] The protective glass film 1 includes an anti-fingerprint coating layer 2 disposed on the surface, a glass layer 3 disposed below the anti-fingerprint coating layer and functioning as a sacrificial layer, an acrylic adhesive layer 4 disposed below the glass layer, a PET layer 5 disposed below the acrylic adhesive layer, a silicone resin layer 6 disposed below the PET layer, and a liner layer 7 disposed below the silicone resin layer, and the film has a thickness of 150 μm to 240 μm.

Description

[Technical field]

[0001] This invention relates to a protective glass film that is attached to a monitor screen to prevent the liquid crystal display screen of a mobile terminal or the like from being scratched or cracked. [Background technology]

[0002] In the prior art, smartphones, mobile phones, and portable personal computers such as tablet and notebook computers are widely used. Some of these devices have touch screen panels attached to their display screens (hereinafter, these are all referred to simply as mobile terminals). The monitor screens (including those with touch screen panels) on which the liquid crystal used in these devices is displayed can be scratched or cracked due to impact such as being dropped. For example, mobile terminals are usually used by holding them in the hand or carried in a pocket or bag, so the monitor screen can be accidentally hit by a hard object or the display screen can be scratched or cracked due to the impact of being dropped on the floor, etc.

[0003] Utility Model Registration No. 3219065 describes a mobile terminal equipped with a film body and a PET outer frame. Glass is installed inside the film body, and the PET outer frame is installed around the middle glass. A shatterproof film is installed below the PET outer frame. Double-sided tape is installed below the shatterproof film, and a release film is installed below the double-sided tape. [Prior art documents] Utility model registration documents

[0004] [Patent Document 1] Utility Model Registration No. 3219065 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional technology, a shatterproof film is provided, but there is a possibility that the shatterproof film may peel off due to a decrease in adhesive strength. In addition, when a mobile terminal is subjected to an external impact, if the shatterproof performance is insufficient, the monitor screen of the mobile terminal may be broken. In addition, there is a possibility that the shatterproof film alone is not able to completely absorb the impact on the monitor screen.

[0006] The purpose of this invention is to have the glass layer function as a sacrificial layer, so that when an external impact is applied to the monitor screen, the glass will break and absorb the energy, thereby preventing damage to the monitor screen. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a protective glass film for protecting a monitor screen of a mobile terminal, the protective glass film including an anti-fingerprint coating layer disposed on the surface, a glass layer disposed below the anti-fingerprint coating layer and functioning as a sacrificial layer, an acrylic adhesive layer disposed below the glass layer, a PET layer disposed below the acrylic adhesive layer, a silicone resin layer disposed below the PET layer, and a liner layer disposed below the silicone resin layer, the protective glass film having a film thickness of 150 μm to 240 μm. Effect of the Invention

[0008] The purpose of this invention is to protect the monitor screen of a mobile terminal from everyday scratches, and when a particularly strong impact is applied, the glass breaks, absorbing the energy and preventing damage to the monitor screen. [Brief description of the drawings]

[0009] [Figure 1] 1 is a front view showing a protective glass film attached to a mobile terminal according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a front view showing the protective glass film shown in FIG. [Diagram 3] FIG. 2 is a reference diagram showing the layer structure of the protective glass film 1 shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a protective glass film 1 according to the present embodiment will be described with reference to Figures 1 to 3. For convenience, parts having the same functions are given the same reference numerals and descriptions thereof will be omitted.

[0011] As shown in Figs. 1 and 2, this embodiment relates to a monitor film 1 applied to a monitor screen M that emits blue light, such as a personal computer or tablet. As shown in Fig. 3, the protective glass film 1 has an anti-fingerprint coating layer 2, a glass layer 3, an acrylic adhesive layer 4, a PET layer 5, a silicone resin layer 6, and a liner layer 7. The thickness of the protective glass film 1 is 150 μm to 240 μm, and the greater the thickness, the greater the impact absorption and the greater the resistance to external impacts. More preferably, the thickness is 200 μm to 220 μm. If the thickness increases, the touch sensitivity when touching the monitor screen M may deteriorate, and the operability of the mobile terminal may decrease. If the thickness decreases, a problem occurs in durability. In addition, the edge of the protective glass film 1 is formed to be transparent, and visibility can be ensured when the protective glass film 1 is attached to the monitor screen M.

[0012] The anti-fingerprint coating layer 2 has water- and oil-repellent properties to prevent fingerprints and dirt from adhering to the monitor screen M and to maintain the visibility of the monitor screen M. Specifically, the anti-fingerprint coating layer 2 is composed of any of a fluorine-based compound, a silicon compound, and a hybrid coating layer that combines an organic compound and an inorganic compound, and has a very smooth surface to prevent oil and fingerprints from adhering. In addition, since it is a transparent coating layer, it does not affect the visibility or light transmittance of the monitor screen M. Note that the anti-fingerprint coating layer 2 may be coated with a water-repellent chemical substance on the surface to make it difficult for fingerprints and dirt to adhere and easy to clean, or may be coated with an anti-reflective coating, which may be a thin film coating to suppress light reflection and improve visibility.

[0013] The glass layer 3 functions as a sacrificial layer that protects the monitor screen M by breaking when the monitor screen M is subjected to an external impact. Specifically, the glass layer 3 uses reinforced glass made of a combination of silica, aluminum oxide, sodium, potassium, etc. In addition, by making the glass layer 3 to have this thickness, the overall weight is reduced, the portability is improved, and the impact on the touch operation and visibility of the monitor screen M is small. This reinforced glass is manufactured by heating at a high temperature of 600°C or more and then quenching. With this manufacturing method, compressive stress occurs when an external impact is applied, and tensile stress occurs inside, so that the glass can maintain strength several times higher than that of normal glass. When the reinforced glass is broken by an external impact, it breaks into small granules, so that sharp fragments are less likely to scatter. In addition, in order to realize this resistance to scattering, a transparent polymer layer may be adhered to the back surface of the glass layer 3 to effectively prevent fragments from scattering. Similarly, a thin film layer may be laminated on both sides of the glass layer 3.

[0014] The glass layer 3 can be manufactured not by tempered glass, but by chemically treating the glass surface to strengthen it. By impregnating the glass with a potassium salt solution (e.g., potassium sulfate or potassium chloride), sodium ions are replaced with potassium ions to generate compressive stress. In this way, compressive stress can be secured and strength sufficient to resist breakage can be maintained.

[0015] The acrylic adhesive layer 4 contains an acrylic adhesive for firmly bonding the glass layer 3 and the PET layer 5 described below, and serves to prevent the glass layer 3 from scattering when it is broken. Specifically, the acrylic adhesive layer 4 is pressed against the glass layer 3. The acrylic adhesive layer is used as a pressure-sensitive adhesive, and is strongly bonded to the glass layer 3 by applying pressure from the outside. Since the acrylic adhesive layer 4 is a polar molecule, it can maintain a particularly strong adhesive force to a highly polar surface such as the glass layer 3. The surface of the glass layer 3 is made of silicon dioxide (SiO2), and the adhesive strength can be ensured by the action of intermolecular interactions.

[0016] The PET layer 5 has a function of suppressing scattering of glass fragments when the glass layer 3 is broken, and improving the durability of the protective glass film 1. Specifically, the PET layer 5 plays a role of supporting the acrylic adhesive layer 4. Compared to the acrylic adhesive layer 4, the PET layer 5 has higher mechanical strength such as impact resistance and tensile strength, and therefore the presence of the PET layer 5 can ensure the necessary durability. Furthermore, the PET layer 5 provides a stable adhesive base for the acrylic adhesive layer 4. In other words, the acrylic adhesive layer 4 is firmly adhered to the PET layer 5, thereby maintaining the strength of the entire monitor film 1.

[0017] The silicone layer 6 is pressed against the PET layer 5, and has adhesive properties to enhance airtightness with the monitor screen M, and also plays a role in reducing the generation of air bubbles when pasting the silicone layer 6 against the monitor screen M. Specifically, the silicone layer 6 is mainly composed of silicone polymer, and is composed of a crosslinking agent, a tackifier, a filler, a plasticizer, etc., so that it functions as an adhesive layer with excellent flexibility, durability, and heat resistance. The silicone polymer is made of an organic silicon compound, and is used to crosslink between the molecules of the silicone polymer by using a crosslinking agent. The special silicone layer 6 is very flexible and easily adapts to the unevenness of the surface, so it can be uniformly adhered to the PET layer 5, achieving stronger adhesion.

[0018] The liner layer 7 is made of PET (polyethylene terephthalate) film, which is used as the base material of the liner layer. The surface of the liner layer 7 is coated with a release agent to prevent strong adhesion and ensure that it can be easily peeled off from the monitor screen M when in use.

[0019] The procedure for placing the protective glass film 1 on the monitor screen M will be described below.

[0020] 1, the camera and speaker of the mobile terminal are moved to the same position as the monitor screen M, and the positions of the camera and speaker are fixed in a temporary position. This temporary position is a provisional position for determining the final position, and the positions are changed appropriately depending on the size, shape, etc. of the protective glass film 1 and / or the monitor screen M.

[0021] Once this temporary position is determined, the liner layer 7 is peeled off from the protective glass film on the monitor screen M. At this time, the liner layer 7 on one end of the glass film is pinched with fingers and peeled off. Note that peeling off the entire surface at once makes it easier for dust and the like to adhere to the monitor screen M, so peeling is performed in sections.

[0022] A jig (not shown) is pressed against the center of the protective glass film 1 against the monitor screen M, and any air bubbles generated between the monitor screen M and the liner layer 7 are pushed outward from the pressed position.

[0023] By carrying out the above steps, the protective glass film 1 can be attached to the monitor screen M without allowing dust or air bubbles to get in.

[0024] (Effects of this embodiment) In this embodiment, the purpose is to protect the monitor screen M of the mobile terminal from everyday scratches, and in the event of a particularly strong impact, the glass layer 3 acts as a sacrificial layer, absorbing the energy of the impact by breaking the glass layer 3, thereby preventing damage to the monitor screen.

[0025] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and technical concept of the present invention.

[0026] In addition, in the above description, when the external dimensions or sizes are described as "same", "equal", "different", etc., the description does not mean in the strict sense. In other words, "same", "equal", and "different" mean "substantially the same", "substantially equal", and "substantially different", allowing for design and manufacturing tolerances and errors.

[0027] In addition to the above, the above-mentioned embodiments and the methods according to the modifications may be appropriately combined and used. Although not illustrated individually, the present invention may be implemented with various modifications without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0028] 1 Protective glass film 2 Anti-fingerprint coating layer 3 Glass Layer 4 Acrylic adhesive layer 5 PET layers 6 Silicone resin layer 7 Liner layer M Monitor Screen

Claims

1. In protective glass films for protecting the monitor screens of mobile devices, an anti-fingerprint coating layer disposed on the surface; a glass layer provided below the anti-fingerprint coating layer and functioning as a sacrificial layer; an acrylic adhesive layer provided below the glass layer; a PET layer provided below the acrylic adhesive layer; A silicone resin layer provided below the PET layer; A liner layer is provided below the silicone resin layer, A protective glass film, characterized in that the thickness of the film is 150 μm to 240 μm.

2. The protective glass film according to claim 1 , A protective glass film, characterized in that the edges of the film are formed of a transparent material.

3. The protective glass film according to claim 1 , A protective glass film comprising a jig for attaching the protective glass film to the monitor screen.

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