KR20110045296A - A Film for Controlling View Angle and A Method for manufacturing the Same, and A Display Device Having the Same - Google Patents

Abstract

PURPOSE: A viewing angle limit film, a manufacturing method, and display device using the same are provided to block a view about four direction of right/left and up/down in a display device such as a laptop computer, mobile phone, and an ATM. CONSTITUTION: A manufacturing method of a viewing angle film includes as follows: a step of forming a register pattern of a plurality of viewing angle shape on a glass substrate; a step of processing a hydrophobic process on a surface of a register pattern of a plurality of square shape; a step of including a master mold having a register pattern of a plurality of engraved square shape; a step of manufacturing a film; a step of injecting black ink inside a horizontal direction concave unit and a vertical unit.

Description

A film for controlling view angle and a method for manufacturing the same, and a display device having the same}

The present invention relates to a viewing angle limiting film, a method of manufacturing the same, and a display device having the same. More specifically, the present invention relates to a viewing angle limiting film and a method for manufacturing the same, and a display device having the same, which can block a view in four directions of left and right and up and down in a display device such as a notebook computer, a mobile phone, an ATM, and the like.

Recently, the viewing angle limiting film has been increasingly used for display devices such as laptops, mobile phones, and ATMs due to privacy and security. In addition, the field of view limiting film is being used in a display device such as an immigration desk of an airport, a school computer room, a library, a ward office, a non-certified name issuing machine of an office, etc., and its application field is gradually expanding.

The viewing angle limiting film is also called a privacy film, and refers to a film that is configured to vary the transmittance of light depending on the angle. In general, the transmittance of the viewing angle limiting film is highest at the front of the filter and lowers from front to side. Therefore, when the viewing angle limiting film is mounted on a display device such as a monitor, the user on the front side can freely view the information displayed on the screen, but only the dark side of the screen is visible to the person on the side (30 ° or more at the left and right angles). Thus, information can be prevented from leaking to others.

Currently, the viewing angle limiting film mainly used is manufactured and sold by 3M company, and the viewing angle limiting film of 3M company alternately stacks an opaque material (or black material) that absorbs light and a transparent material that transmits light. It is manufactured by the method of thinly cutting in the lamination direction and the perpendicular direction. By this method, a transparent material that transmits light and an opaque material that absorbs light (hereinafter referred to as a "black pattern") are arranged in a constant pattern, and as a result, light incident from the front side is transmitted, but light incident at a predetermined angle or more It is absorbed by the black pattern and cannot be transmitted. Therefore, the information displayed on the display device is visible only to the user in front, and the viewing angle limiting effect is invisible to the person in the side.

However, in the manufacturing method of the conventional viewing angle limiting film of the 3M company, since the two materials must be alternately laminated by a thickness corresponding to the size of the display device, the process is complicated and uniformity of the laminated final viewing angle film is uniform. This low quality was poor, there was a problem that the manufacturing cost is high.

An alternative prior art for solving the above-mentioned problems is filed in the Republic of Korea Patent Application No. 10-2008-0023235 by the name of the invention "Method of manufacturing a viewing angle limiting film" dated March 13, 2008 by LG Chem, It is described in detail in Korean Patent Publication No. 10-2009-0098061 published on September 17, 2009.

1A is a schematic illustration of a method of making an viewing angle limiting film according to an alternative prior art.

Referring to FIG. 1A, an alternative viewing angle limiting film manufacturing method according to the prior art mainly comprises: (1) resist pattern forming step, (2) hydrophobic treatment step, (3) master mold manufacturing step, (4) film manufacturing step, and (5) It consists of an ink injection step.

More specifically, in the resist pattern forming step, a photoresist, which is a photosensitive material, is first applied onto a glass substrate using photolithography, which is well known to those skilled in the art, and then the photoresist is selectively exposed and developed by using a photo mask. , To form a fine pattern. Thereafter, in the hydrophobization step, the surface of the formed resist pattern is hydrophobized by, for example, a method of coating a hydrophobic polymer. As a result, the surface of the resist becomes hydrophobic, and as described later, the silicone resin, which is a material of the master mold, and the resist are prevented from being strongly adhered, so that the peeling is clean when the master mold is separated. Thereafter, in the master mold manufacturing step, a resin is injected into the resist surface on which the hydrophobization treatment is completed, to prepare a master mold.

For example, a silicone resin is applied on a resist pattern with an appropriate thickness, and then left to stand at room temperature (about 20 to 40 ° C.) for 5 to 25 hours to allow a level to a certain thickness, followed by natural curing. The master mold may be prepared by heating at 180 ° C. for about 10 to 30 minutes to completely cure and then separating the resist from the resist. It is preferable to use a silicone resin as such master mold manufacturing resin. Thereafter, an ultraviolet curable resin is injected into the master mold and cured to produce a film. As a result, the same uneven pattern as the resist pattern which is the reverse phase of the master mold pattern is formed in the produced film. Then, black ink is inject | poured into the recessed part (or recessed part) of an uneven | corrugated pattern, and a black pattern is formed. Thereafter, a protective film is formed over the black pattern to produce a viewing angle limiting film.

FIG. 1B is a view showing a cross section of the viewing angle limiting film manufactured by the method of FIG. 1A, and FIG. 1C is a front view of the viewing angle limiting film manufactured by the method of FIG. 1A.

1B and 1C, in the viewing angle restriction film 100 mounted in front of the display unit 132 constituting the display device 130, the user of the front side F is displayed through the transparent resin 120. Although the information of the device 130 can be viewed, the viewer who sees from the left and right sides S cannot see the information of the display device 130 because the vision is blocked by the black ink.

However, the viewing angle limiting film 100 according to the above-mentioned 3M's prior art and the alternative prior art may block the view of the person located on the left and right side S, respectively, but the upper direction U and the lower direction D The view of the person in the oblique direction (or oblique direction) is impossible to block.

Therefore, a new method for solving the above-mentioned problems is required.

The present invention is to solve the above-mentioned problems of the prior art, a viewing angle limiting film and a method for manufacturing the same, which can block the view in the left and right and up and down four directions in a display device such as a notebook, mobile phone, ATM, and the like, It is to provide a display device.

Method for producing a viewing angle restriction film according to a first aspect of the present invention for solving the above-mentioned problems of the prior art comprises the steps of: a) forming a plurality of rectangular-shaped resist pattern on a glass substrate; b) hydrophobizing the surfaces of the plurality of rectangular resist patterns; c) manufacturing a master mold having a plurality of engraved square shaped resist patterns; d) manufacturing a film on which a plurality of square irregularities are formed using the master mold; e) injecting black ink into horizontal recesses and vertical recesses of the plurality of rectangular concave-convex patterns; And f) forming a protective film on top of the plurality of square black patterns formed by the injection of the black ink and the plurality of square uneven patterns.

Viewing angle limiting film according to a second aspect of the present invention is a film formed with a plurality of rectangular irregularities pattern; A plurality of square black patterns formed by black ink respectively injected into the horizontal recesses and the vertical recesses formed in the plurality of square irregularities; And a protective film formed on the plurality of square black patterns and the plurality of square irregularities.

Method for producing a viewing angle limiting film according to a third aspect of the present invention comprises the steps of: a) laminating a plurality of printing films having a mesh shape; b) pressing the plurality of print films; And c) forming a protective film on the upper surfaces of the plurality of compressed print films.

The viewing angle limiting film according to the fourth aspect of the present invention includes a plurality of printing films each having a mesh shape and laminated and compressed in an aligned state; And a protective film formed on the upper surfaces of the plurality of printing films, wherein each mesh shape is composed of a plurality of horizontal opacity portions and a plurality of vertical opacity portions formed on each of the plurality of printing films. It features.

A display device according to a fifth aspect of the present invention includes a display unit; And a viewing angle limiting film mounted in front of the display unit, wherein the viewing angle limiting film has a mesh shape, each of which is stacked and pressed in an aligned state; And a protective film formed on an upper surface of the plurality of printing films, wherein each mesh shape comprises a plurality of horizontal opacity portions and a plurality of vertical opacity portions formed on each of the plurality of printing films. It features.

The following advantages are achieved by using the viewing angle limiting film of the present invention, a method of manufacturing the same, and a display device having the same.

1. It can block the view in 4 directions of left and right and up and down.

2. The viewing angle limiting film composed of a plurality of printing films having a mesh shape is easier and simpler in manufacturing process than in the prior art, and the manufacturing process time and material, etc., are significantly reduced.

Further advantages of the present invention can be clearly understood from the following description with reference to the accompanying drawings, in which like or similar reference numerals denote like elements.

Hereinafter, the present invention will be described with reference to embodiments and drawings of the present invention.

The present invention is characterized by forming a black pattern or a opaque lattice pattern in the form of a mesh or a lattice on the viewing angle limiting film in order to block a view in four directions of left, right, and top and bottom in the display device.

2A to 2E illustrate a method of manufacturing a viewing angle restriction film according to a first embodiment of the present invention.

2A to 2E, a method of manufacturing a viewing angle restriction film according to a first embodiment of the present invention may include: a) forming a plurality of rectangular-shaped resist patterns 252 on a glass substrate 240; b) hydrophobizing the surfaces of the plurality of rectangular resist patterns 252; c) manufacturing a master mold 260 having a plurality of engraved square-shaped resist patterns 252; d) manufacturing a film 220 having a plurality of square uneven patterns 222 formed using the master mold 260; e) injecting black ink (212) into horizontal recesses (223h) and vertical recesses (223v) of the plurality of rectangular uneven patterns (222); And f) forming a protective film (not shown) on the plurality of square black patterns 214 formed by the injection of the black ink 212 and the plurality of square uneven patterns 222. Include.

More specifically, in the step of forming a plurality of square-shaped resist patterns 252 according to the manufacturing method of the viewing angle limiting film according to the first embodiment of the present invention, first, a glass substrate ( After the photoresist 250, which is a photosensitive material, is applied onto the 240 (see FIG. 2A), the photoresist 250 is selectively exposed using a plurality of square or multiple mesh photo masks (not shown). And development, thereby forming a fine pattern 252 having a plurality of square shapes (see FIG. 2B). Thereafter, in the hydrophobization treatment step, the surfaces of the plurality of rectangular resist patterns 252 formed are hydrophobized by, for example, a method of coating a hydrophobic polymer (not shown). As a result, the surfaces of the plurality of rectangular-shaped resist patterns 252 become hydrophobic, and as described later, the silicone resin, which is a material of the master mold 260, and the resist 250 are prevented from strongly adhering to each other, thereby preventing the master mold When the 260 is separated, the peeling is made clean. Thereafter, in the master mold manufacturing step, a resin is injected into the resist surface on which the hydrophobization treatment is completed to manufacture the master mold 260 (see FIG. 2C). The master mold 260 may include, for example, i) applying a silicone resin to a plurality of square shape resist patterns 252 to a suitable thickness; ii) natural curing at room temperature (about 20 ° C. to 40 ° C.) for a first predetermined time (approximately 5 to 25 hours) to level to a constant thickness; And iii) heating at a predetermined temperature range (about 100 to 180 ° C.) for a second predetermined time (about 10 to 30 minutes) to completely cure and then separating the resist 250 from the resist 250. As a result, a master mold 260 having a plurality of engraved rectangular resist patterns 252 is obtained. Here, it is preferable to use a silicone resin as the resin for manufacturing the master mold 260. Thereafter, by injecting and curing the ultraviolet curable resin into the master mold 260, the plurality of square-shaped resist patterns 252 which are inverse to the plurality of engraved square-shaped resist patterns 252 of the master mold 260 and The film 200 in which the same plurality of square uneven patterns 222 are formed is manufactured (see FIG. 2D). The plurality of rectangular concave-convex patterns 222 formed in the manufactured film 200 include a horizontal concave portion 223h and a vertical concave portion 223v. Thereafter, black ink 212 is injected into the horizontal concave portion 223h and the vertical concave portion 223v of the plurality of rectangular concave-convex patterns 222 to thereby form the plurality of square black patterns 214. Form. Thereafter, a protective film (not shown) is formed on the plurality of square black patterns 214 and the plurality of square uneven patterns 222 to produce the viewing angle restriction film 200.

As described above, the viewing angle limiting film 200 manufactured by the method of manufacturing the viewing angle limiting film according to the first embodiment of the present invention includes a film 200 having a plurality of rectangular-shaped uneven patterns 222 formed therein; A plurality of square black patterns 214 formed by black ink respectively injected into the horizontal recesses 223h and the vertical recesses 223v formed in the plurality of square uneven patterns 222; And a protective film (not shown) formed on the plurality of square black patterns 214 and the plurality of square uneven patterns 222. The viewing angle limiting film 200 according to the first exemplary embodiment of the present invention has left and right directions by a plurality of vertical black patterns 214v formed by the black ink 212 injected into the vertical recesses 223v. In addition to blocking the side (S) field of view, the vertical direction (U and D directions) are provided by the plurality of horizontal black patterns 214h formed by the black ink 212 injected into the horizontal recesses 223h. The advantage that it can also block the oblique field of view is achieved.

2F to 2H illustrate a method of manufacturing a viewing angle restriction film according to a second embodiment of the present invention. More specifically, Figure 2f is a view showing a plan view of a mesh-shaped printing film, Figure 2g is a cross-sectional view of the horizontal direction (H direction) in which a plurality of the mesh-shaped printing film shown in Figure 2f laminated, Figure 2h Is a cross-sectional view in the vertical direction (V direction) in which a plurality of mesh-shaped printing films shown in FIG. 2F are laminated.

Referring again to FIGS. 2F to 2H, a method of manufacturing a viewing angle limiting film according to a second embodiment of the present invention may include a) stacking a plurality of printing films 220 having a mesh shape; b) pressing the plurality of printing films 220; And c) forming a protective film (not shown) on the upper surfaces of the plurality of compressed print films 220.

More specifically, in the step of stacking a plurality of printing films 220 having a mesh shape according to the manufacturing method of the viewing angle restriction film according to the second embodiment of the present invention, each of the printing films having a mesh shape ( Prepare a plurality of 220). Here, the mesh shape is composed of a plurality of horizontal opacity portions 222h formed on the printing film 220 and a plurality of vertical opacity portions 222v formed on the printing film 220. Thereafter, the prepared plurality of printing films 220 are laminated in an aligned state. Then, the multilayered film film is obtained by the multilayer compression method of the film which used the several printing film 220 laminated | stacked. In the multilayer compression method of such a film, a thermosetting, photocurable, or pressure-curable bonding agent may be selectively applied between the plurality of printing films 220. However, not only the bonding may be performed using the thermal properties of the printing film 220 without using the above-described bonding agent, but also the multi-layer pressing may be performed by simply removing physical spaces between the plurality of printing films 220 using only physical force. This may be done. As a result, the mesh shapes (that is, the plurality of horizontal opacity portions 222h and the plurality of vertical opacity portions 222v) provided on each of the printing films 220 are compressed to align to form an opaque layer lattice pattern. 222 is formed. Thereafter, a protective film (not shown) is coated on the upper surfaces of the plurality of compressed print films 220 to manufacture the viewing angle limiting film 200.

FIG. 2I is a plan view schematically illustrating a viewing angle limiting film and a function manufactured by a method of manufacturing a viewing angle limiting film according to a second exemplary embodiment of the present invention.

Referring to FIG. 2I together with FIGS. 2F to 2H, the viewing angle limiting film 200 according to the second embodiment of the present invention has a mesh shape, and each of the plurality of printed films laminated and compressed in an aligned state ( 220); And a protective film (not shown) formed on upper surfaces of the plurality of printing films 220. Here, each mesh shape is composed of a plurality of horizontal opacity portions 222h formed on the printing film 220 and a plurality of vertical opacity portions 222v formed on the printing film 220. In addition, the plurality of mesh shapes stacked and compressed in an aligned state form an opaque lattice pattern 222.

As described above, the viewing angle limiting film 200 according to the first embodiment shown in FIG. 2E or the viewing angle limiting film 200 according to the second embodiment shown in FIG. 2I may be, for example, a notebook or a mobile phone. , An ATM, a PC monitor, and a touch screen may be mounted and used in the display unit 132 of the display device 130 (see FIG. 1B). The viewing angle restriction film 200 mounted on the display unit 132 of the display device 130 such as a laptop, a mobile phone, or an ATM may include a plurality of vertical black patterns 214v (see FIG. 2E) or an opaque lattice pattern 222. The vertical opacity portion 222v (see FIG. 2I), which constitutes a cross-section, can block the left and right side S views, as well as a plurality of horizontal black patterns 214h (see FIG. 2E) or an opaque layer. The advantage that the oblique view in the vertical direction (U and D direction) can also be blocked by the horizontal opacity portion 222h (see FIG. 2I) constituting the grid pattern 222 is achieved.

Various modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims. It is not. Accordingly, the scope of the present invention should not be limited by the above-described exemplary embodiments, but should be determined only in accordance with the following claims and their equivalents.

1A is a schematic illustration of a method of making an viewing angle limiting film according to an alternative prior art.

FIG. 1B is a view showing a cross section of a viewing angle restriction film manufactured by the method of FIG. 1A.

FIG. 1C is a diagram illustrating a front view of the viewing angle restriction film manufactured by the method of FIG. 1A.

2A to 2E illustrate a method of manufacturing a viewing angle restriction film according to a first embodiment of the present invention.

It is a figure which shows the top view of the mesh-shaped printing film.

FIG. 2G is a cross-sectional view of a horizontal direction (H direction) in which a plurality of mesh-shaped printing films shown in FIG. 2F are laminated.

FIG. 2H is a cross-sectional view in a vertical direction (V direction) in which a plurality of mesh-shaped printing films shown in FIG. 2F are laminated.

Claims (11)

In the manufacturing method of the viewing angle restriction film, a) forming a plurality of rectangular-shaped resist patterns on a glass substrate; b) hydrophobizing the surfaces of the plurality of rectangular resist patterns; c) manufacturing a master mold having a plurality of engraved square shaped resist patterns; d) manufacturing a film on which a plurality of square irregularities are formed using the master mold; e) injecting black ink into horizontal recesses and vertical recesses of the plurality of rectangular concave-convex patterns; And f) forming a protective film on top of the plurality of square black patterns formed by the injection of the black ink and the plurality of square uneven patterns Method of producing a viewing angle limiting film comprising a. The method of claim 1, The said plurality of square-shaped uneven | corrugated pattern is a manufacturing method of the viewing angle restriction film provided with a horizontal recess and a vertical recess. For viewing angle limiting film, A film in which a plurality of square-shaped uneven patterns are formed; A plurality of square black patterns formed by black ink respectively injected into the horizontal recesses and the vertical recesses formed in the plurality of square irregularities; And A protective film formed on an upper portion of the plurality of square black patterns and the plurality of square irregularities. Viewing angle limiting film comprising a. In the manufacturing method of the viewing angle restriction film, a) laminating a plurality of printing films having a mesh shape; b) pressing the plurality of printing films; And c) forming a protective film on an upper surface of the plurality of compressed print films Method of producing a viewing angle limiting film comprising a. The method of claim 4, wherein And said mesh shape is comprised of a plurality of horizontal opacity portions formed on said printing film and a plurality of vertical opacity portions formed on said printing film. The method of claim 5, And said plurality of horizontal opacity portions and said plurality of vertical opacity portions form an opaque layer lattice pattern. For viewing angle limiting film, A plurality of printed films each having a mesh shape and laminated and compressed in an aligned state; And Protective film formed on the upper surface of the plurality of printing film Including, Each mesh shape is composed of a plurality of horizontal opacity and a plurality of vertical opacity formed on each of the plurality of printing films. Viewing angle limiting film. For viewing angle limiting film, A plurality of printed films each having a mesh shape and laminated and compressed in an aligned state; And Protective film formed on the upper surface of the plurality of printing film Including, Each mesh shape is composed of a plurality of horizontal opacity and a plurality of vertical opacity formed on each of the plurality of printing films. Viewing angle limiting film. The method of claim 8, The plurality of mesh shapes form an opaque lattice pattern, The plurality of vertical opacity blocks the side view in the left and right directions, The plurality of horizontal opacity parts to block the oblique view in the vertical direction Viewing angle limiting film. In a display device, A display unit; And Viewing angle limiting film mounted in front of the display unit Including, The viewing angle limiting film A plurality of printed films each having a mesh shape and laminated and compressed in an aligned state; And Protective film formed on the upper surface of the plurality of printing film Including; Each mesh shape is composed of a plurality of horizontal opacity and a plurality of vertical opacity formed on each of the plurality of printing films. Display device. The method of claim 10, The viewing angle limiting film A film in which a plurality of square-shaped uneven patterns are formed; A plurality of square black patterns formed by black ink respectively injected into the horizontal recesses and the vertical recesses formed in the plurality of square irregularities; And A protective film formed on an upper portion of the plurality of square black patterns and the plurality of square irregularities. Display device comprising a.

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