KR20160042730A - Protection film of display - Google Patents

Abstract

A display protection film is disclosed. The provided display protection film comprises a transparent resin sheet having a shape corresponding to a display part of a smart device; and a glass film coated on the transparent resin sheet.

Description

Display protective film {Protection film of display}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display protective film, and more particularly, to a display protective film having a thin thickness and securing a high surface hardness to an external environment such as a scratch.

With the advent of the rapid information age in recent years, various display devices such as smart phones, smart pads, various mobile phones, MP3 players, PDAs, and navigation devices are being used. However, most of them are expensive electronic products, and users need to protect these display devices from scratches or external impacts and to decorate their appearance.

Particularly, in the case of a liquid crystal disposed on the front surface of a display device, the liquid crystal is likely to be broken because it is exposed to a strong external shock in a defenseless state. After the liquid crystal is broken, the liquid crystal may be replaced, The repair cost becomes large.

Accordingly, a tempered glass panel has recently been introduced to enhance the protection against liquid crystal disposed on the surface of a display device. This is because the conventional liquid crystal protective film has a responsiveness against a slight impact of a degree of scratch, The liquid crystal is prevented from damage by protecting the expensive liquid crystal from strong external impact, and it is getting hot reaction from the consumers.

However, the tempered glass has no bending property and has a limitation in thinning, so it protrudes to the outside to feel a foreign body feeling. In addition, the tempered glass has a disadvantage that it is expensive compared with a transparent resin sheet because it is subjected to a process of thinning the thickness through mechanical polishing, chemical or thermal strengthening.

Accordingly, there is a need to provide a display protective film that is excellent in bendability as a transparent resin sheet and is resistant to external stimuli such as scratches.

A related art is Korean Patent No. 10-1237631 (a tempered glass panel for surface protection of a display device and a manufacturing method thereof).

The present invention provides a display protective film on which a glass film is coated on a transparent resin sheet corresponding to the shape of a display portion of a smart device.

It is another object of the present invention to provide a display protective film to which a releasable film for protecting a pressure sensitive adhesive is applied and a pressure sensitive adhesive that can be attached to a display portion of a smart device is applied to a lower portion of a transparent resin sheet.

According to an aspect of the present invention,

A transparent resin sheet having a shape corresponding to a display portion of the smart device;

There is provided a display protective film comprising a glass film coated on the transparent resin sheet.

Also,

A pressure sensitive adhesive applied to a lower portion of the transparent resin sheet;

And a release film bonded to the lower portion of the pressure-sensitive adhesive.

Also,

Wherein the glass film is formed by curing a coating liquid containing at least one of polysiloxazane, polysilazane, and polysilsesquioxane.

Further, there is provided a display protective film further comprising a printing layer formed on the upper portion of the glass film.

 According to another aspect of the present invention,

(a1) preparing a transparent resin sheet;

(a2) coating a glass film on the transparent resin sheet;

(a3) cutting the transparent resin sheet coated with the glass film according to the shape of the display unit of the smart device; And a protective film formed on the substrate.

Also,

Between the (a1) and the (a2)

Applying a pressure sensitive adhesive to a lower portion of the transparent resin sheet;

And attaching a release film covering the pressure-sensitive adhesive.

According to another aspect of the present invention,

(b1) preparing a transparent resin sheet;

(b2) cutting the transparent resin sheet according to the shape of the display unit of the smart device;

(b3) coating a glass film on the transparent resin sheet; And a protective film formed on the substrate.

Also,

Between the (b1) and the (b2)

Applying a pressure sensitive adhesive to a lower portion of the transparent resin sheet;

And attaching a release film covering the pressure-sensitive adhesive.

Also,

Wherein the glass film is formed by curing a coating liquid containing at least one of polysiloxazane, polysilazane, and polysilsesquioxane.

The present invention provides a display protective film in which a glass film is coated on a transparent resin sheet corresponding to a shape of a display portion of a smart device.

The present invention also provides a display protective film to which a releasable film for protecting a pressure sensitive adhesive is applied to a lower portion of a transparent resin sheet, wherein a pressure sensitive adhesive that can be attached to a display portion of a smart device is applied.

1 is a perspective view illustrating a process of attaching a display protective film according to a first embodiment of the present invention to a smart device.
2 is an enlarged view of a side view and a perspective view of a display protective film according to a first embodiment of the present invention.
3 is a flowchart showing a manufacturing process of a display protective film according to a second embodiment of the present invention.
FIGS. 4 to 6 are views showing a manufacturing process of a display protective film according to a second embodiment of the present invention. FIG.
7 is a flowchart illustrating a manufacturing process of a display protective film according to a third embodiment of the present invention.
8 to 10 are views showing a process for manufacturing a display protective film according to a third embodiment of the present invention.
11 is a sectional view of a display protective film according to a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. , Thereby not limiting the spirit and scope of the present invention.

The terms "upper" and "lower" described below are only for describing relative positions, and are not essential positions for achieving technical purposes.

FIG. 1 is a perspective view illustrating a process of attaching a display protective film according to a first embodiment of the present invention to a smart device, FIG. 2 is a perspective view of a display protective film according to a first embodiment of the present invention, .

The display protection film 100 of the present embodiment is attached to the display unit of the smart device 200 to protect the display unit from external impact or scratch.

The display protection film 100 of this embodiment includes a transparent resin sheet 10 having a shape corresponding to the display portion of the smart device; And a glass film 20 coated on the transparent resin sheet 10.

The transparent resin sheet 10 is a sheet made of synthetic resin and corresponds to the shape of the display portion. Here, the expression "corresponds to the shape of the display portion" includes not only a reinforced glass (or sapphire glass) covering a liquid crystal screen, but also a dummy region of reinforced glass other than a liquid crystal screen, for example, of a smart phone.

The transparent resin sheet 10 may be provided with a through hole 110 for exposing a speaker or a button of a smart device.

As the transparent resin sheet 10, any film can be used as long as it is a transparent plastic film. Examples of the transparent resin sheet 10 include a cycloolefin-based derivative having a unit of a monomer including a cycloolefin such as polyethylene terephthalate (PET), norbornene or a polycyclic norbornene-based monomer, diacetylcellulose, Cellulose, ethylene-vinyl acetate copolymer, polyester, polystyrene, polyamide, polyetherimide, polyether sulfone, polyether sulfone, polyether sulfone, polyether sulfone, polyether sulfone, polyether sulfone, polyether sulfone, But are not limited to, acrylic, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, , Polymethylmethacrylate , Polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyurethane, and epoxy. An unoriented uniaxial or biaxially oriented film can be used.

A glass film 20 is coated on the transparent resin sheet 10. The glass film 20 is formed by curing a coating liquid containing at least one of polysiloxazane, polysilazane, and polysilsesquioxane.

The coating liquid may be any one of polysiloxazane, polysilazane, and polysilsesquioxane, or a mixture containing at least one of them may be used. In addition to the polyfunctional (meth) acrylate oligomer and the (meth) acrylate monomer, a photoinitiator and a solvent may be further contained. The photoinitiator and the solvent are components that can be removed in the course of curing into a film after forming a glass film, and it is particularly preferable to use the solvent for diluting the prepared coating solution.

The coating liquid may further contain additives as required. The additive may be at least one of a coupling agent, a curing accelerator, a tackifier resin, a UV absorber, a leveling agent, an antifoaming agent, a plasticizer, a dispersant, a heat stabilizer, a light stabilizer, and an antistatic agent.

The photoinitiator can be applied without limitation as long as it is generally used in the art. The photoinitiator may be at least one selected from the group consisting of hydroxy ketones, aminoketones, and hydrogen recycling photoinitiators.

Specific examples of the photoinitiator include 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1, diphenyl ketone benzyl dimethyl ketal, 2- 1-one, 4-hydroxycyclophenyl ketone, dimethoxy-2-phenylacetophenone, anthraquinone, fluorene, triphenylamine, carbazole, 3-methylacetophenone, , 4-dimethoxyacce

At least one selected from the group consisting of benzene, toluene, tosophenone, 4, 4-diaminobenzophenone, 1-hydroxycyclohexyl phenyl ketone and benzophenone.

The photoinitiator is preferably contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the total coating liquid. If the content is less than 0.1 part by weight, the curing rate of the composition for forming a glass film may be slow, and if it exceeds 10 parts by weight, cracks may be generated in the glass film cured by over-curing.

The solvent is low in reactivity and can be used without limitation as long as it does not react with polysiloxazane, polysilazane or polysilsesquioxane. Examples of the solvent include alcohols such as methanol, ethanol, isopropanol, butanol, methylcellulose, ethylsorbox, etc., ketones such as methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, Cyclohexanone, etc.), hexane (hexane, heptane, octane etc.), benzene (benzene, toluene, xylene and the like) The solvents exemplified above may be used alone or in combination of two or more.

The solvent may be added in an amount of 0.1 to 90 parts by weight based on 100 parts by weight of the entire coating liquid. If the content is less than 0.1 parts by weight, the viscosity may be high and the workability may be deteriorated. If the content is more than 90 parts by weight, the curing process may take a long time and the economical efficiency may be deteriorated.

The coating liquid of this embodiment may be cured by heat.

의 연속적인 결합으로 이루어진 유리막이 형성된다. 경과과정에서 용매와 기타 첨가제들은 대부분 날아가고, 폴리실록사잔, 폴리실리잔 또는 폴리실세스퀴옥산과 같은 실록산 화합물은 대기중의 수분 및 산소와 결합하여 실리카(

)로 변화되어 유리막(세라믹)으로 형성된다. 코팅에 의해서 투명 수지시트(10) 상부에 유리막(20)이 형성되므로, 투명 수지시트(10)는 기재가 되어, 유리막(20)을 지지한다. 유리막(20)은 박막의 형태로 투명 수지시트(10)의 상부에 코팅되므로, 굴곡성이 좋다. 아울러, 외부의 충격이나 스크래치에 강한 특성이 있다. When the coating liquid is cured

A glass film formed by successive joining of the glass plates is formed. During the course of the process, solvents and other additives are mostly blown, and siloxane compounds such as polysiloxazane, polysilazane, or polysilsesquioxane combine with moisture and oxygen in the air to form silica

) And is formed of a glass film (ceramic). Since the glass film 20 is formed on the transparent resin sheet 10 by the coating, the transparent resin sheet 10 becomes the base material and supports the glass film 20. Since the glass film 20 is coated on the transparent resin sheet 10 in the form of a thin film, flexibility is good. In addition, it is resistant to external impacts and scratches.

The display protective film 100 coated with the glass film 20 has a surface hardness of 6H or more. The conventional transparent resin film 10 has a surface hardness of only 2H.

On the other hand, polysilsesquioxane can have the following chemical formula 1 or 2 structure.

[Chemical Formula 1]

(2)

In the above formula (1) or (2), R is an aliphatic or aromatic hydrocarbon having 2 to 80 carbon atoms and containing 2 to 20 (meth) acrylate groups, and may or may not contain a hetero atom.

In addition, the polysilazane or the polysiloxazane may include a moiety represented by the following formula (3).

(3)

In Formula 1, R1 to R3 are each independently selected from the group consisting of hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, Substituted or unsubstituted C7 to C30 arylalkyl groups, substituted or unsubstituted C1 to C30 heteroalkyl groups, substituted or unsubstituted C2 to C30 heterocycloalkyl groups, substituted or unsubstituted C2 to C30 alkenyl groups, substituted Or an unsubstituted alkoxy group, a substituted or unsubstituted carbonyl group, a hydroxy group, or a combination thereof.

In addition, the polysiloxazane may have a moiety represented by the following general formula (4).

[Chemical Formula 4]

R4 to R7 in Formula 2 are each independently selected from the group consisting of hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted Or a substituted or unsubstituted C1 to C30 heteroalkyl group, a substituted or unsubstituted C2 to C30 heterocycloalkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a substituted or unsubstituted C1 to C30 heteroalkyl group, An unsubstituted alkoxy group, a substituted or unsubstituted carbonyl group, a hydroxy group, or a combination thereof.

On the other hand, a pressure sensitive adhesive 30 can be applied to the lower portion of the transparent resin sheet 10. The pressure sensitive adhesive (30) may be a silicone pressure sensitive adhesive. Further, the release sheet 40 may be further attached to the lower portion of the adhesive 30. [

FIG. 3 is a flowchart illustrating a manufacturing process of a display protective film according to a second embodiment of the present invention, and FIGS. 4 to 6 are views illustrating a manufacturing process of a display protective film according to a second embodiment of the present invention. Figs. 4 and 6 are perspective views, and Fig. 5 is a sectional view.

Step S11 is a step of preparing the transparent resin sheet 10. The transparent resin sheet 10 may be a synthetic resin sheet having good light transmittance. In this embodiment, a PET sheet is used.

Step S12 is a step of coating the glass film 20 on the transparent resin sheet 10. The glass film 20 is formed by curing a coating liquid containing at least one of polysiloxazane, polysilazane, and polysilsesquioxane. As a method of applying the coating liquid to the glass film 20, any one of a roll coating, a spin coating, a dip coating, a flow coating, and a spray coating may be selected. In addition, any known coating method other than the above-described coating method may be selected.

S13 is a step of cutting the transparent resin sheet 10 coated with the glass film 20 according to the shape of the display unit of the smart device. As an example of a smart phone, the display part is made of tempered glass or sapphire glass. The transparent resin sheet 10 is cut so as to cover the entire surface of the glass. The cutting method may be laser cutting.

On the other hand, a step of applying a pressure-sensitive adhesive (30) to the lower part of the transparent resin sheet (10) between S11 and S12; And attaching a releasing film 40 covering the pressure sensitive adhesive 30. The adhesive 30 and the release film 40 are bonded to the lower portion of the transparent resin sheet 10 before the glass sheet 20 is coated so that the adhesive sheet 30 and the release film 40 can be cut at a time in accordance with the shape of the display unit.

FIG. 7 is a flowchart illustrating a manufacturing process of a display protective film according to a third embodiment of the present invention, and FIGS. 8 to 10 are views illustrating a manufacturing process of a display protective film according to a third embodiment of the present invention. Figs. 8 and 10 are perspective views, and Fig. 9 is a sectional view.

Step S21 is a step of preparing the transparent resin sheet 10. The transparent resin sheet 10 may be any synthetic resin material having excellent light transmittance. In this embodiment, a transparent resin sheet 10 made of PET is used.

S22 is a step of cutting the transparent resin sheet 10 according to the shape of the display unit of the smart device.

Between steps S21 and S22, a step of applying a pressure-sensitive adhesive (30) to the lower part of the transparent resin sheet (10); And attaching a release film (40) covering the pressure sensitive adhesive (30). After the adhesive 30 and the release film 40 are attached to the transparent resin sheet 10, they can be cut at once according to the shape of the display portion.

Step S13 is a step of coating the glass film 20 on the transparent resin sheet 10. The glass film 20 is formed by curing a coating liquid containing at least one of polysiloxazane, polysilazane, or polysilsesquioxane. As a method of applying the coating liquid to the glass film 20, any one of a roll coating, a spin coating, a dip coating, a flow coating, and a spray coating may be selected. In addition, any known coating method other than the above-described coating method may be selected.

11 is a cross-sectional view of a display protective film according to a fourth embodiment of the present invention. The display protection film 200 includes a transparent resin sheet 110 having a shape corresponding to the display portion of the smart device; A glass film 120 coated on the transparent resin sheet 110, an adhesive 130 applied under the glass film 120, and a protective film 140 covering the adhesive 130.

In addition, the print layer 150 may be printed on the upper surface of the glass layer 120. The print layer 150 may be formed by a silk printing or UV printing method, or may be formed in a multilayer by applying silk printing and UV printing in a laminated manner.

The printed layer 150 can be formed, so that the reinforced glass panels 100 and 100 'can be effectively used for decoration and advertisement promotion. If you print your reciprocal or advertising text with patterns or patterns of various colors, you will be able to increase your advertising effectiveness.

   While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Modifications and additions by those skilled in the art to an equivalent range based on the embodiments will also fall within the scope of the present invention.

Transparent resin sheet (10) Glass film (20)
The pressure-sensitive adhesive (30) release film (40)

Claims (9)

A transparent resin sheet having a shape corresponding to a display portion of the smart device;
And a glass film coated on the transparent resin sheet.
The method according to claim 1,
A pressure sensitive adhesive applied to a lower portion of the transparent resin sheet;
And a releasing film bonded to the lower portion of the pressure-sensitive adhesive.
The method according to claim 1,
Wherein the glass film is formed by curing a coating liquid containing at least one of polysiloxazane, polysilazane, and polysilsesquioxane.
The method according to claim 1,
And a printing layer formed on the upper portion of the glass film.
(a1) preparing a transparent resin sheet;
(a2) coating a glass film on the transparent resin sheet;
(a3) cutting the transparent resin sheet coated with the glass film according to the shape of the display unit of the smart device; ≪ / RTI >
6. The method of claim 5,
Between the (a1) and the (a2)
Applying a pressure sensitive adhesive to a lower portion of the transparent resin sheet;
And attaching a release film covering the pressure sensitive adhesive.
(b1) preparing a transparent resin sheet;
(b2) cutting the transparent resin sheet according to the shape of the display unit of the smart device;
(b3) coating a glass film on the transparent resin sheet; ≪ / RTI >
8. The method of claim 7,
Between the (b1) and the (b2)
Applying a pressure sensitive adhesive to a lower portion of the transparent resin sheet;
And attaching a release film covering the pressure sensitive adhesive.
9. The method according to any one of claims 5 to 8,
Wherein the glass film is formed by curing a coating liquid containing at least one of polysiloxazane, polysilazane, and polysilsesquioxane.

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