KR101165899B1 - Security film for display device - Google Patents

Abstract

The present invention relates to a viewing angle limiting film adhered to the surface of a display, and more particularly to a forming viewing angle limiting film in which the non-transmissive layer comprises an electrochromic dye. The present invention includes a light transmitting portion, a non-transmissive portion and an electrically conductive portion, the light transmitting portion and the non-transparent portion are formed alternately, the electrically conductive portion is formed to contact the non-transparent portion, the non-transmissive portion is electrochromic dye Characterized in that it comprises a. Viewing angle limiting film of the present invention has the effect of adjusting the viewing angle according to the user's request.

Viewing angle limiting film, security film, light control film, electrochromic dye

Description

Viewing angle limiting film for display device {SECURITY FILM FOR DISPLAY DEVICE}

The present invention relates to a viewing angle limiting film attached to a surface of a display, and more particularly to a viewing angle limiting film in which the non-transmissive layer comprises an electrochromic dye.

Portable information communication devices such as laptops, PDAs and mobile phones, and ATMs of financial institutions store various data such as personal information, and data and information are input and confirmed through the display screen of the device. The display screen is characterized by a wide viewing angle and high brightness, so that others can easily observe the display screen from the side, whereby personal information and various security data can be exposed to others. In particular, as the use of information devices increases in public places, there is a great demand for a screen configuration to protect information displayed on the screens of information devices from people around them and to prevent invasion of personal privacy. In response to such demands, a view angle limiting film is a technology that prevents the screen of an information device from being viewed at a certain angle or more. The viewing angle limiting film may also be called a light control film, a security film, or the like. The demand for the viewing angle limiting film is increasingly used according to the tendency of personal privacy.

1 illustrates the structure of a viewing angle limiting film for a conventional display device. Typically, the conventional viewing angle limiting film 101 has a structure in which the light transmitting portion 110 of the transparent material and the non-transmissive portion 120 of the opaque material are alternately formed along the horizontal direction of the film.

2 illustrates a method of manufacturing a viewing angle restriction film for a conventional display device. In general, the conventional viewing angle limiting film 101 as shown in FIG. 1 alternately bonds a plurality of transparent light transmissive films 130 and an opaque non-transparent film 140 to each other, and then the vertical direction of the adhesive surface. It is prepared by cutting.

As a conventional technique regarding a viewing angle restriction film, the thing of following Documents 1-4 is mentioned as an example.

Document 1 discloses a method of manufacturing a louver film by alternately laminating a transparent material and an opaque layer and then cutting it vertically.

Document 2 discloses a plastic blind prepared by alternately positioning and fixing a transparent film and an adhesive light blocking film and then cutting in a vertical direction.

In Document 3, a method of manufacturing a security film by shaving a laminated billet thinly is disclosed.

Document 4 discloses a security film and a method for manufacturing the same, wherein the four-angle grate layer is configured to prevent peeping by adjusting the viewing angle in four directions.

[Document 1] US 2,053,173

[Document 2] US 2,689,387

Document 3 US 3,524,789

Document 4 KR 10-2007-0003871 2007. 1. 12.

In the conventional viewing angle limiting film, the non-transparent part always blocks the light, and thus has a disadvantage of providing a somewhat darker display screen field of view not only to others but also to the user. In particular, there is a problem of providing a user with a somewhat darker display screen field of view even in a place where it is not necessary to limit a viewing angle such as a home or a private office where the eyes of others are not much.

Therefore, the present invention is to provide a viewing angle limiting film that can adjust the viewing angle to meet the needs of the user, to solve the problems of the prior art.

The present invention has been made to solve the above problems of the prior art,

And a light transmitting portion, a non-transmissive portion, and an electrically conductive portion, wherein the light transmitting portion and the non-transmissive portion are alternately formed, the electrically conductive portion is formed to contact the non-transparent portion, and the non-transmissive portion includes an electrochromic dye. It provides a display viewing angle restriction film, characterized in that.

In addition, in the present invention, the electrochromic dye provides a display viewing angle limiting film, characterized in that the reducing color.

In addition, in the present invention, the electrochromic dye includes one or a combination of two or more thereof selected from oxides of titanium (Ti), niobium (Nb), molybdenum (Mo), tantalum (Ta), and tungsten (W). It provides a display viewing angle limiting film, characterized in that.

In the present invention, the electrochromic dye is WO ₃ , MoO ₃ And it provides a display viewing angle limiting film, characterized in that it comprises one or a combination of two or more selected from TiO ₃ .

In addition, in the present invention, the electrochromic dye provides a display viewing angle limiting film, characterized in that the oxidation chromogenic.

In the present invention, the electrochromic dye is vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), rhodium (Rh) and iridium (Ir) It provides a display viewing angle limiting film, characterized in that it comprises one or a combination of two or more selected from the oxide of the.

In addition, in the present invention, the electrochromic dye provides a display viewing angle limiting film, characterized in that it comprises one or a combination of two or more selected from V ₂ O ₅ , IrO ₂ , Nb ₂ O ₅ and NiO.

In the present invention, the light transmitting portion provides a display viewing angle limiting film, characterized in that the insulating polymer.

In the present invention, the light transmitting part is polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyacrylate, polymethyl methacrylate, polyurethane, polycarbonate, polyethylene, polypropylene and cellulose acetate butylate It provides a display viewing angle limiting film, characterized in that it comprises a copolymer having at least one selected from the group of (CAB) or two or more selected from the group.

In addition, in the present invention, the width of the non-transmissive portion (a): light transmitting portion width (b) = 1: 1 to 9 provides a display viewing angle restriction film, characterized in that within the range.

In addition, in the present invention, the light transmitting part width (b): non-transmissive part height (c) = 1: provides a display viewing angle limiting film, characterized in that within the range.

In addition, in the present invention, the non-transmissive portion provides a display viewing angle restriction film, characterized in that formed on both sides of the light transmitting film.

In addition, in the present invention, it provides a display viewing angle limiting film, characterized in that the limiting angle is within the range of 18.4 ~ 80.5 °.

In addition, the present invention provides the display viewing angle limiting film, characterized in that the conductive portion is a conductive polymer film.

In the present invention, the conductive portion is one selected from polyacetylene (polyacetylene), polyaniline (polyaniline), polypyrrole (polypyrrole), polythiophene (polythiophene) and poly sulfur nitride (poly sulfur nitride) It provides a display viewing angle limiting film, characterized in that it comprises a combination of two or more.

Viewing angle limiting film of the present invention has the effect of adjusting the viewing angle according to the user's request.

Hereinafter, the present invention will be described in detail.

Figure 3 shows the structure of an embodiment of the viewing angle restriction film of the present invention.

The present invention includes a light transmitting portion, a non-transmissive portion and an electrically conductive portion, the light transmitting portion and the non-transparent portion are formed alternately, the electrically conductive portion is formed to contact the non-transparent portion, the non-transmissive portion is electrochromic dye Characterized in that it comprises a.

The light transmitting portion is formed alternately with the non-transmissive portion. It is preferable that the said light transmitting part is a transparent material which can permeate | transmit light, and it is more preferable especially that it is a transparent insulating polymer.

The light transmitting portion is selected from the group of polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyacrylate, polymethylmethacrylate, polyurethane, polycarbonate, polyethylene, polypropylene and cellulose acetate butylate (CAB) It may be used to include a copolymer having at least one selected from the group or two or more selected from the group.

The non-transmissive portion is electrically conductive through which a current can flow, and includes an electrochromic dye.

The electrochromic dye may include an electrochromic compound and further include an additional electrolyte. In addition, the electrochromic dye may be formed in the form of a film on a transparent conductive electrode (ITO or FTO glass). That is, the device may be configured by dissolving an oxidative electrochromic compound or a reducing electrochromic compound in an solvent together with an electrolyte, and then gelling it.

The electrochromic film is colored or decolorized on the surface of the metal oxide when electrons and ions are inserted and removed by an electrochemical redox reaction. For example, WO ₃ inclusive In case of film, lithium ion (Li ⁺ ) and electrons are injected in LiClO ₄ + PC electrolyte, so the film discolors from colorless WO ₃ to blue Li _x WO ₃ in case of WO ₃ film, LiNiO ₂ for the film containing the color change is gray in LiNiO ₂ as a colorless Li _{1 + x} NiO _2.

The electrochromic compound includes an organic or inorganic electrochromic compound. Examples of the organic electrochromic compound include bipridilium (viologen), fluorane, polyaniline, polythiophene, ferrocene, phenazine, Phenothiazine, and the like and include bipridilium called viologen. In general, viologen is a 1,1'disubstituted-4,4'bipyridinium salt, which is applied to herbicides, electron transfer mediators, and electrochromic materials.

In addition, the organic electrochromic compound includes an oxidative electrochromic compound and a reducing electrochromic compound, and when the oxidative electrochromic compound is included, it becomes an oxidative electrochromic dye, and when it contains a reducing electrochromic compound, it becomes a reducing electrochromic dye. .

When electricity flows through the non-transmissive portion, the electrochromic dye becomes transparent or colored to adjust the viewing angle. The tungsten oxide used in the embodiment of the present invention among the electrochromic dyes will be described with reference to the working principle as an example.

Tungsten oxide (WO ₃ ) is reacted with ions or electrons in the solution to give a color through the process of formula (1).

WO ₃ (transparent color) + Xe ^- ↔ M + XM ⁺ _X WO ₃ (dark blue)

Where M represents lithium (Lithium: Li), hydrogen (proton), calcium (calcium: Ca) and the like, in general, lithium is most used. X is a stoichiometric coefficient.

Formula 1 is a reversible reaction, the oxidation or reduction reaction proceeds in accordance with the direction of the electromotive force and thus the color of the electrochromic dye is also changed.

Since the non-transmissive part of the present invention is a conductor containing such electrochromic dye, it can be made transparent or colored according to the direction of current flow. In this configuration, the viewing angle restriction film of the present invention can adjust the viewing angle.

The electrochromic dye may be one that is reducing or oxidatively chromogenic.

The reducing dye can be used that includes one or a combination of two or more selected from oxides of titanium (Ti), niobium (Nb), molybdenum (Mo), tantalum (Ta) and tungsten (W), Examples of these include WO ₃ , MoO ₃ And one selected from TiO ₃ or a combination of two or more thereof.

The oxidative dye is one selected from oxides of vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), rhodium (Rh) and iridium (Ir). Or a combination containing two or more thereof, and examples thereof include one or two or more combinations thereof selected from V ₂ O ₅ , IrO ₂ , Nb ₂ O _5, and NiO. have.

In the present invention, when the width of the non-transmissive part is a, the width of the light transmissive part is b and the height of the non-transmissive part is c in the structure of the film, it is preferably produced in the following ratio.

The width of the non-transmissive portion and the width of the light transmissive portion are at least 1: 1 or more, so that the aperture ratio is 50% or more, so that the user can easily recognize the screen. However, the larger the ratio of the width (a) of the non-transmissive portion to the width (b) of the light transmission portion is, the better, the higher the ratio of the opening ratio is. It is good to make it to the range.

In addition, the width b of the light transmissive portion versus the height c of the non-transmissive portion determines the viewing angle restriction angle, which is at least 1: 0.33 or more to show the viewing angle restriction effect (limit angle 18.4 °). The larger this ratio is, the better, but if it exceeds 1: 6 (limit angle 80.5 °), since there is almost no increase in the limit angle range, it is preferably from 1: 1 (limit angle 45 °) to 1: 5 (limit). Angle 78.7 °). In this case, the viewing angle limiting angle means an angle at which light is not transmitted, and the larger the limiting angle, the greater the privacy protection effect.

4 illustrates the relationship between the aperture ratio and the viewing angle according to the non-transmissive and light transmissive patterns.

The electric conductive part acts like a conductive wire that allows current to flow through the non-transmissive part.

The conductive part is an electrically conductive material, and is not limited as long as it can transmit light emitted through the light transmitting part, but the conductive transparent polymer film is preferable.

The conductive polymer film includes one or a combination of two or more thereof selected from polyacetylene, polyaniline, polypyrrole, polythiophene, and poly sulfur nitride. Can be used.

Viewing angle limiting film of the present invention can be prepared by the following method.

In one embodiment of the present invention, the step of forming a light transmitting portion on one surface of the conductive portion at intervals (S101);

Forming a non-transmissive part including an electrochromic dye between the light transmitting part intervals (S201); And

Forming another electrical conductive part other than the conductive part to be in contact with one surface of the light transmitting part and the non-transmitting part (S300)

Through the viewing angle restriction film of the present invention can be prepared.

Figure 5 shows a block diagram of a method of manufacturing a viewing angle restriction film according to an embodiment of the present invention.

In still another embodiment of the present invention, forming a non-transmissive part including an electrochromic dye on one surface of the conductive portion at intervals (S102);

Forming a light transmission part between the non-transmission part gaps including the electrochromic dye (S202); And

Forming another electric conductive part other than the electric conductive part to be in contact with one surface of the light transmitting part and the non-transmitting part (S300)

Through the viewing angle restriction film of the present invention can be prepared.

Figure 6 shows a block diagram of a method of manufacturing a viewing angle restriction film according to another embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples. The embodiments of the present specification are only for the detailed description of the present invention, and are not intended to limit the scope of the present invention. Therefore, the embodiments according to the claims should be construed as belonging to the scope of the present invention.

Example

Applicant prepared the viewing angle limiting film of the present invention as disclosed in Examples 1 and 2 below.

Example 1

7 shows the process of Example 1 above.

A master on which a high step pattern was formed was prepared. The model of the pattern was a groove having a "┎┑" shape in cross section. The water repellent series was coated to increase the release force of the master. As the water-repellent series material, a fluorine-based compound (product name: EGC-1720, manufacturer: 3M) was used.

The water-repellent master was mixed with a silicone resin elastomer (product name: Sylgard 184, manufacturer: Dowcorning) at a weight ratio of 10: 1 (silicone resin: curing agent = 10: 1) and then cured by heating. Thermoset elastomeric stamps were detached from the master.

The polycarbonate was filled in the intaglio portion of the elastomeric stamp and then printed on the polyacetylene transparent conductive polymer.

At this time, dry etching was performed to remove the insulating polycarbonate printed on the undesired portion on the conductive film (when printing is formed in a pattern shape, a separate dry etching is not required. Drying etching is preferable as the material may flow to parts other than the pattern).

The electrochromic dye containing tungsten oxide was filled in the part in which the insulating layer is not formed.

An outermost conductive layer was formed by covering the top surface with a conductive polymer film other than the conductive polymer.

Example 2

8 shows the process of Example 2.

A master on which a high step pattern was formed was prepared. The model of the pattern was a groove having a "┎┑" shape in cross section. The water repellent series was coated to increase the release force of the master. As the water-repellent series material, a fluorine-based compound (product name: EGC-1720, manufacturer: 3M) was used.

Silicone resin elastomer (product name: Sylgard 184, manufacturer: Dowcorning) was mixed with a curing agent and a weight ratio of 10: 1 (silicone resin: curing agent = 10: 1) in the water-repellent master and then cured by heating. Thermoset elastomeric stamps were detached from the master.

The intaglio portion of the elastomeric stamp was filled with an electrochromic dye containing tungsten oxide, and then printed on the polyacetylene transparent conductive polymer.

Polycarbonate was filled in the portion where the conductive layer was not formed.

An outermost conductive layer was formed by covering the top surface with a conductive polymer film other than the conductive polymer.

Experimental Example

Electrode plates with conductive wires were attached to upper and lower conductive polymers of Examples 1 and 2, respectively, and a voltage of about 12V was applied.

In Example 1, the viewing angle limiting effect was observed as the color of the non-transmissive part turned dark blue. When the reverse voltage was applied again, the non-transmissive part became transparent and the viewing angle limiting effect was eliminated.

1 is a view showing the structure of a viewing angle restriction film for a conventional display device.

2 is a view showing a method for manufacturing a viewing angle restriction film for a conventional display device.

Figure 3 is a view showing the structure of an embodiment of the viewing angle restriction film of the present invention.

4 is a view showing the relationship between the aperture ratio and the viewing angle according to the non-transmissive and light transmissive pattern.

5 is a block diagram of a method of manufacturing a viewing angle restriction film according to an embodiment of the present invention.

Figure 6 is a block diagram of a method of manufacturing a viewing angle restriction film according to another embodiment of the present invention.

7 is a view showing a process of the first embodiment.

8 is a view showing a process of the second embodiment.

Claims (15)

And a light transmitting portion, a non-transmissive portion, and an electrically conductive portion, wherein the light transmitting portion and the non-transmissive portion are alternately formed, the electrically conductive portion is formed to contact the non-transparent portion, and the non-transparent portion includes an electrochromic dye. , The electrochromic dye is a display viewing angle restriction film, characterized in that it comprises an electrolyte. The display viewing angle limiting film of claim 1, wherein the electrochromic dye is reduced color. The electrochromic dye according to claim 1 or 2, wherein the electrochromic dye is one selected from oxides of titanium (Ti), niobium (Nb), molybdenum (Mo), tantalum (Ta) and tungsten (W) or two or more thereof. Display viewing angle restriction film, characterized in that it comprises a combination. The method of claim 3, wherein the electrochromic dye is WO ₃ , MoO ₃ And one selected from TiO ₃ or a combination of two or more thereof. The display viewing angle limiting film of claim 1, wherein the electrochromic dye is oxidatively chromogenic. 6. The electrochromic dye according to claim 1 or 5, wherein the electrochromic dye is vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), rhodium (Rh) and Display angle limiting film, characterized in that it comprises one or a combination of two or more selected from the oxide of iridium (Ir). The display viewing angle limiting film of claim 6, wherein the electrochromic dye comprises one or a combination of two or more selected from V ₂ O ₅ , IrO ₂ , Nb ₂ O _5, and NiO. The display viewing angle limiting film of claim 1, wherein the light transmitting part is an insulating polymer. The method of claim 1 or 8, wherein the light transmitting portion is polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyacrylate, polymethyl methacrylate, polyurethane, polycarbonate, polyethylene, polypropylene and cellulose A display viewing angle limiting film, characterized in that it comprises a copolymer having at least one selected from the group of acetate butylate (CAB) or two or more selected from the group. The display viewing angle limiting film according to claim 1, wherein the width of the non-transmissive portion (a): the width of the light transmitting portion (b) is within the range of 1: 1 to 9. The display viewing angle limiting film according to claim 1, wherein the light transmitting portion width (b): non-transmissive portion height (c) = 1: 0.33 to 6 within the range. The display viewing angle limiting film of claim 1, wherein the non-transmissive portion is formed on both sides of the light transmitting film. The display viewing angle limiting film of claim 1, wherein the limiting angle is within a range of 18.4 to 80.5 °. The display viewing angle limiting film of claim 1, wherein the conductive portion is a conductive polymer film. 15. The method of claim 1 or 14, wherein the conductive portion is selected from polyacetylene (polyacetylene), polyaniline (polyaniline), polypyrrole (polypyrrole), polythiophene and poly sulfur nitride (poly sulfur nitride) Display viewing angle restriction film, characterized in that it comprises one or a combination of two or more thereof.

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