KR102070236B1 - Light control sheet and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an optical control sheet and a manufacturing method thereof and, more specifically, to an optical control sheet which cuts a laminate of alternating a light-permeable member and a light-impermeable member using a curved cutting member to form a cut body, and controls the moving direction of light because a virtual extension line faces one region by the light-impermeable member when the curved cutting body made by cutting is flattened, and to a manufacturing method thereof. The optical control sheet is simpler, more efficient, more reliable, and more precise in order that the virtual extension line of the light-impermeable member faces the one region.

Description

Light control sheet and manufacturing method thereof

The present invention relates to a method for manufacturing a light control sheet and a light control sheet manufactured by the method. Specifically, the cut body is formed by cutting the laminated body in which the light transmissive member and the light transmissive member are alternately formed by using the bent cutting member, and when the bent cut body made by cutting is flattened, the virtual body formed by the light transmissive member The direction of light is controlled by extending the extension line toward one region.

In general, light refers to visible light, but scientifically invisible electromagnetic waves such as infrared rays, ultraviolet rays, X-rays, and gamma rays are also called lights. We use this linearity of light to get information.

      The light control sheet is a light impermeable member that blocks light and an optical impermeable member that passes through most of the light are alternately arranged to block the transmission of information by light from a non-desired position by transmitting only light in a desired direction. It is a device to maximize the transmission of information by light in one place.

      In the present invention, the light control sheet may be classified into a viewing angle limiting sheet and an X-ray grid sheet according to the purpose of use. Firstly, the viewing angle limit sheet is used for the purpose of transmitting light from a light source such as a monitor only to the operator through the sheet. Secondly, the X-ray grid sheet is used for the purpose of blocking the light that is transmitted from the point light source and passed through the sample to the photosensitive sensor through the sheet and is detected or scattered through the sample. These two kinds of light control sheets are different in the kind of light passing through the surface used, and the light travels in the opposite direction, but structurally similar.

     The conventional viewing angle limiting sheet has a structure in which the light transmitting member and the light impermeable member are alternately arranged in a direction perpendicular to the surface of the sheet. Thus, light passing through the conventional viewing angle limiting sheet is perpendicular to the face of the sheet. Such a conventional viewing angle limit sheet has an effect that a person located on the side of the display or window cannot see the object displayed through the display or window. However, such a conventional viewing angle limiting sheet has a security problem in that the edge of the display or window appears dark in the eyes of the operator, and more clearly visible to the person behind the operator than the operator.

      1 is described in Patent Document 001, and cut into a jigsaw along a cutting line of the laminate produced by alternately arranging the light transmissive member and the light impermeable member as shown in step (a), and the same top and bottom as in step (b) The cut body bent in the direction can be obtained. If the cut body is planarized, a light control sheet can be obtained in which the virtual extension line of the light-transmissive member faces a predetermined region as in step (c). It can be seen that the imaginary extension lines of the light transmitting member and the light impermeable member of the sheet face a certain region in the upper vertical center of the sheet, and this region becomes a shape close to one line.

       Also, in the step (c), when cutting into thin rods along the cutting line again and filling the light impermeable member and joining it, a plate member as in step (d) can be obtained. On one side, the virtual extension line of the light impermeable member is one area. On the other side, the virtual extension lines of the light impermeable members are all perpendicular to the upper surface.

       In addition, in Patent Document 002, two points are arranged up and down in the same structure as in step (c) of FIG. This one is made to be one point, which is thick to use two pieces, and the manufacturing process is also complicated and not precise.

      In addition, in the vertical X-ray grid sheet, the X-ray passes through the center of the core and the image may be clear, but as the peripheral portion is blocked by the light impermeable member, the non-photosensitive area is increased to obtain an unclear image. There were heavy side effects.

      In addition, according to Patent Document 003 below, after laminating the light transmitting member and the light impermeable member alternately, the sheet is limited to produce a viewing angle-restricted sheet facing one area which is the optimal working space by thermally compressing and vertically cutting and flattening. However, the manufacturing process is complicated.

      Thus, the manufacturing method of the light control sheet facing the focus or a region around the focal point known to date can be classified into four categories.

  1) Forming a sheet by laminating a thin light transmitting member and a light impermeable strip having a slope formed thereon

  2) Tilt formation effect with multiple sheets with minute differences

  3) Make slits with slopes on the substrate and fill the light impermeable member

  4) bending effect after vertical lamination

However, these four methods are complex, time consuming, and require very precise techniques. Therefore, there is a need for a method and apparatus for manufacturing the optical control sheet so that the virtual extension line by the light impermeable member is simply and efficiently directed to one region.

US Patent Publication No. 2,133,385 (October 18, 1938) US Patent Publication No. 3,919,559 (Nov. 11, 1975) Korea Patent Publication No. 10-1183800 (September 11.)

The present invention solves the above problems, and aims to solve the following problems. An object of the present invention is to provide a manufacturing method for efficiently processing a light control sheet facing one region and a light control sheet made therefrom.

The problems of the present invention are not limited to those mentioned above, and other problems not mentioned above will be clearly understood by those skilled in the art from the following description.

According to one embodiment for solving the above problems, a method for efficiently processing a light control sheet facing one area, the laminated body formed by alternately stacking the light transmitting member and the light impermeable member is cut in a curved shape with a jigsaw. The bent cutting body obtained by the planarization was improved to make it simpler, faster, and more precisely in which the inclination is formed so that the imaginary extension line according to the light-transparent member is directed toward one area centered on one focal point. Specifically, when the bent cut body obtained by processing the laminated body in which the light transmissive member and the light impermeable member are alternately arranged with the bent cutting member is planarized, a virtual extension line according to the light impermeable member becomes a structure in which a common extension is directed to one common area. .

One common area here is the viewing angle limit sheet, which is a work space near the top of the operator's position in front of the screen. For desktop computer monitors or TV screens that are stationary, you can usually use the manufacturer's recommended separation distance of 40 cm or more. In the case of an X-ray grid sheet, since it refers to a point where a point light source spaced apart from the photosensitive sensor exists, one area becomes a calculated focal point, and the size of the space occupied by one area may vary depending on the work content.

The present invention can provide a simpler, more efficient and reliable precision light control sheet and a method of manufacturing the same so that the virtual extension line of the light impermeable member is directed to one area.

1 is a view for explaining the manufacturing method of the X-ray grid sheet proposed in the prior art.
2 is a view for explaining a method for manufacturing a light control sheet according to the present invention.
3 is a view of various examples of manufacturing a laminate using a light transmitting member and a light transmitting member.
4 is a view of various cutting methods that can be employed in the present embodiment.
FIG. 5 is a view illustrating a region in which a cutting body according to various types of cutting members faces in this embodiment.
FIG. 6 is a view illustrating cutting of a spiral laminate manufactured by rolling a) a light transmitting member and a light transmitting member alternately overlapping concentric circles, and b) a rolled laminated member produced by rolling the light transmitting member and the light transmitting member. .
In Figure 7 a) is a planarized light control sheet, b) is a view of each of the light control sheet removed only the light transmitting member from the light control sheet.
FIG. 8 is a view for explaining an example in which a point where an imaginary extension line of the light impermeable member meets does not exist in the upper portion of the center of the sheet and is biased to one side.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

      As shown in a) of FIG. 2, when the straight cutting member 9, which is a planar cutting member, moves in the track of the guide 8 to cut the laminate 1, the bent cut member 6, which is an open sheet, can be obtained. By using a bent cutting member 10 as shown in b) of FIG. 2 to move in a simple linear trajectory in the vertical direction 11, a bent cut body similar to b) of FIG. 1 can be obtained here. It is very convenient to cut the laminate simply by the vertical movement of the cutting member. If the lattice stack 1 is cut by the method of a) of FIG. 2, it is possible to manufacture in one cut and flattening without the complicated process as shown in d) of FIG. 1, but the method of b) of FIG. Simple, the movement of the cutting member is also simple and more practical.

      The method of manufacturing the laminate using the light transmitting member and the light transmitting member may have various examples as shown in FIG. 3. Specifically, when viewed from the upper cut surface of the laminate, a) is a light transmissive member and a light impermeable member alternately in the transverse direction, there is only a light transmissive member or a light impermeable member in the longitudinal direction. However, b) to g) have a portion where only the light-transmissive member exists in either the horizontal or vertical direction, but no portion where only the light-transmissive member exists. Thus, when there is a portion where only the light transmitting member exists in one direction, it is called a simple laminate, and when there is no portion where only the light transmissive member exists in the horizontal or vertical portion, it is called a composite laminate.

As a type of composite laminate, a sheet made by cutting light transmissive members and light impermeable members alternately arranged in a simple laminate is alternately laminated with a light transmissive member sheet, so that the security of the horizontal or vertical direction is higher than that of a simple laminate. The lattice-shaped laminated body and the sheet coated with the light-transmitting member on the light-transmitting member are rolled up to form a spiral, and the process is simple and the light-directing spiral laminate has a process of applying the light-transmitting member to the light-transmitting member. The helical angular helical laminate, the optically transmissive member and the light impermeable member, which are rolled up in a spiral shape, are laminated in a circle from the inside, and the annular laminate, the light transmissive member and the light impermeable member are laminated in an n-angle order from the inside. Angled ring-shaped laminate, and the fibrous light transmitting member is fixed horizontally, and the light impermeable member is present in the remaining space. For example, there may be a fibrous laminate similar in function to the lattice but easy to manufacture. Fibrous laminates can be made of curved structures such as round, oval, or n-shaped, such as triangles, squares, pentagons, hexagons, etc. The ratio of the permeable member and its effect can be determined.

The distance between the light transmissive member and the light transmissive member does not always have to be constant in the manufacture of the laminate. The greater the height of the light transmissive member than the distance between the light transmissive members, the better the security of the viewing angle limit sheet, and the reflection or scattering of the X-ray grid sheet. Good light blocking effect. In addition, the flattened cut body may be flattened to calculate the interval of the light impermeable member so that the laminate may be manufactured. In the central part of the laminate, the viewing angle limitation effect according to the separation distance is small, so that the light impermeable member may not be inserted at a certain portion. You can also make a wider gap

In this case, when the light transmissive member and the light impermeable member are viewing angle limited sheets, the light transmissive member may be a polymer, and a resin which is curable with actinic rays such as a thermoplastic resin, a thermosetting resin, and ultraviolet rays may be used. Examples of such resins include cellulose resins such as cellulose acetate butyrate (CAB) and triacetyl cellulose (TAC); Polyolefins such as polyethylene (PE) and polypropylene (PP); Polyesters such as polyethylene terephthalate (PET); Polystyrene (PS); Polyurethanes; Polyvinyl chloride (PVC); Acrylic resins, polycarbonate (PC) resins, and the like can be used. In addition, when high security is not required, the light transmissive member may be changed to a light transmissive member using an electrochromic dye to release the security, and in this case, the light transmissive member may be used as a transparent insulating polymer.

On the other hand, the light impermeable member may be a dark color pigment such as black or gray pigment, or a dark color dye; Metals such as aluminum and silver; Any one or more of a dark metal oxide and a dark pigment or dye may be used. Also, by changing the gwangbul transmission component using the electrochromic dyes if you do not need high security to the light transmitting member unsecure and use gwangbul-transmitting member may be formed of an electrochromic dye, an inorganic material WO _3, NiO Polyaniline may be used as an organic material such as _x H _y , Nb ₂ H _y , V ₂ O ₅ , TiO ₂ , MoO _3, and the like.

In addition, in the case of the X-ray grid sheet, the light transmitting member may be a material having high X-ray transmittances such as boron, aluminum, titanium, chromium and synthetic resins, ceramics, glass, paper, carbon graphite, and the like. The light impermeable member may be a material having a high X-ray shielding rate such as tungsten, gold, lead, or barium compound, but as described below, the material that can be easily removed when removing the light transmissive member and using only the light impermeable member May be expressed as a light transmitting member.

On the other hand, a method of obtaining a bent cut by cutting the laminate is also a method of vertically moving the bent cutting member 10 as shown in b) of Figure 2, but various cutting methods that can be employed in this embodiment is shown in FIG. Is shown.

Prior to performing the various cutting methods, first, to form a desired shape on the simple laminate or composite laminate made of the light transmitting member and the light impermeable member using the curved cutting member and the guide disclosed in FIG. 4. A cutting process for forming the concave or convex surface of the upper part of the sieve is performed. Here, one concave surface and one convex surface are symmetrical with each other, and thus may be the same shape when flipped over. For example, in order to form a concave surface on the upper surface of the laminate, first, the laminate is cut using a concave-shaped cutting member and a guide, and then, again, corresponding to the concave surface of the laminate through a cutting process. When the bottom of the concave surface of the laminate is cut to a depth of the sheet thickness with a curved cutting member and a guide, a convex surface of the cut body is produced to form a cut body for manufacturing the light control sheet. This manufacturing process is equally applicable to the case of cutting using the convex-shaped cutting member and the guide.

In addition, the laminated body is cut using a concave cutting member and a guide, and the formed concave surface is rotated by an abrasive member having a shape in which a rotational trajectory can cover the laminate surface or by rotating a small abrasive member moving along the cutting surface. Grind or polish to the concave surface of the machine. Subsequently, the bottom surface of the laminate is cut to a depth of sheet thickness by using a curved cutting member and a guide corresponding to the concave surface of the laminate to form a convex surface of the cut body, and then the rotational trajectory is a convex surface of the cut body. The cutting member may be manufactured by adding a polishing or polishing operation to the convex surface by rotating the polishing member having a shape capable of covering the surface or a small polishing member moving along the cutting surface. At this time, the polishing process may be made by rotating the cutting body.

In the cross section of the cutting body, a cross section parallel to the moving direction of the cutting member is called a horizontal cross section, and a cross section perpendicular to the moving direction of the cutting member is called a vertical cross section, and a cross section passing through an axis connecting the center of the upper and lower surfaces of the cutting body. They are called 360 ° cross section. In FIGS. 4A and 4B, when the laminate is cut along a guide bent to the lattice laminate, a cut body having both a horizontal cross section and a vertical cross section bent in the same direction can be obtained. In c) and d) of FIG. 4, when the guide bent to the lattice stack is tilted or the guide is operated asymmetrically, the stack is eccentrically cut away from the center, and the horizontal cross section and the vertical cross section are different. A bent cut can also be obtained.

In FIG. 4 e) and f), the bent cutting member 10, which is a cutting member, is moved by the swing arm 13 to turn on the stack 1. If the distance between the swing arm shaft 15 and the center of the cutting member becomes the focal length, and the curvature of the cutting member and the trajectory of the cutting member coincide, some shapes of the sphere can be turned on. By adjusting the angle of the cutting member while finely adjusting the distance of the height adjusting device 12 or the swing arm 13, the aspherical curved surface can be turned on. In the case of Fig. 4, e) the center of the swing arm axis is located at the center of the stack 1 to obtain a symmetrical cutting body, and in the case of f) the center of the swing arm axis is located at one side of the stack asymmetry. It is possible to obtain a cutting body of the various types of bent cutting body can be conveniently obtained, and by using a bent guide as shown in a) in Figure 4 e) or f) it may be possible to reduce the error due to vibration.

The bent cutting member and the raceway make a cutting body, and when it is flattened, it becomes a structure facing one focal point, thereby making an optimal product. However, even when a straight line is bent or a single concave or convex curved cutting member and a track are used, the light control sheet that flattens the concave or convex cut is present at a limited distance. . However, in the current vertical light control sheet, even if the distance is infinite, the structure facing one area is not realized.

The structure of the cutting member may be a form in which a plurality of straight lines are bent, or a form in which a straight line and a curve are bent, a form in which a plurality of curves are the same or different in curvature are connected. In addition, a shape made of one convex or one concave curved shape is called a curved cutting member. The bent cutting member is called a bent cutting member such as a section cutting member and a curved cutting member.

In addition, when the cutting member makes one linear motion, it is called linear motion, and the motion of the shape where the straight line is bent, the motion of the shape of the straight line and the curve connected by section, and the motion of the curve that the various curves are combined by section This is called. In addition, when the cutting member performs a single curved motion, it is called a curved motion, and it is called a curved motion by combining the interval motion and the curved motion.

In addition, a process using an abrasive member may be further performed, so that at least one of the horizontal cross section and the vertical cross section of the cut body is 1) a straight line having a section structure is bent or 2) a straight line and a curved line are combined, 3 A variety of curves may be combined into sections, and 4) one convex or concave curve having a curved structure. And 360. ^The rotating section of the section group may be either linear structure, any one of the region-like structure, a curved structure.

By the way, when the cross section of the cutting body is a part of the curve, the viewing angle limit sheet when the shape of the curve is similar in a circle whose radius is the distance to the focal point, which is the center of one area, or in a parabola having a focal length similar to the radius of the circle. Even if the center of one area does not have a structure that focuses only on one focal point, the difference in security effect is not so large that the shape of the curve and the focal length cannot be limited.

According to an embodiment, in the case of the cut body using the section-shaped cutting member in which three straight lines are bent as shown in FIG. 5A, the inclined body has three inclined angles, and as shown in FIG. In the case of the cut body using the section-shaped cutting member connected to bend, there are five inclined angles. The one area thus formed is not one focal point, but the structure facing the one area that could not be realized in the conventional vertical light control sheet is made, so the clarity and security are excellent. In addition, in the case where n angles are infinitely large, when n is an infinitely large light-transparent member having one angle per part connected with a straight line bent, it may be calculated only by a formula using a curve without considering material properties. As in c) of FIG. 5, all the light-transmissive members have different angles, so that one region may be one focal point and thus an optimal product without errors.

On the other hand, when cutting the laminated body with a bent cutting member of curved form, first, the sphere some form of section group ^360. The rotary section matches, but the form of the section group than the sphere are ^360. There are rotation section may not match. Each grinding section to the group created with the swing arm, this was placed on the concave surface or convex surface to fit the convex surface and concave surface to the polishing member in a desired curve shape ³⁶⁰ has all of the rotating section can be equally manufactured.

The cutting member may be manufactured using a hot wire, a saw blade, or an ultrasonic cutter that is more easily cut in consideration of not only a sharp material but also physical properties of the material.

And since the laminated body containing a metal component is difficult to cut at normal temperature, it can work in the conditions which are easy to cut, without changing a structure by heating or chemical treatment. In addition, even in the case of a laminate including a synthetic resin, since cutting may be easy when heated or cooled to a certain temperature to reach a predetermined temperature, work may be facilitated by cutting by heating, cooling or chemical treatment.

On the other hand, Figure 6a) is a view for explaining the cutting of the ring-shaped laminate having a structure in which the light transmitting member and the light impermeable member are alternately arranged to have a concentric circle. 6B is a view illustrating cutting of a spiral laminate having a spirally rolled structure, through which cross-sectional cutouts such as curvatures of spherical or aspherical lens surfaces are easy to manufacture, and have good light directivity, which has been difficult to produce. Focused ring-shaped or spiral-shaped light control sheets can also be easily manufactured.

The bent cut body thus produced can be increased in flexibility by heating, cooling, pressurization, chemical treatment, etc., and then flattened by heating, cooling, depressurization, chemical treatment, and the like. In addition, it is possible to produce a single light control sheet immediately after the flattening, but it can also be cut into thick sheets at once and then cut into several sheets on the plane.

In a flat sheet as shown in a) of FIG. 7, only the light transmitting member may be removed and used as shown in b). When lead is first used as the light transmitting member and tungsten is used as the light transmitting member, lead and tungsten are simply laminated. After cutting in the form of a planar cut to form a sheet, and then adding a tungsten sheet between the cut and bonded with an adhesive having a heat resistance at a temperature higher than the melting point of lead, a lattice-like laminate is produced. It can be bent to make a cut and then flattened, and lead can be removed by heat treatment. In this case, lead removed may be referred to as a light transmitting member.

When the light transmitting member is removed in this way, an empty space for entering air is made, and the transmittance of light used is higher than that of the conventional light transmitting member, so that the X-ray grid sheet has a clear image even at a lower X-ray dose than the conventional case. You will get

On the other hand, in Fig. 8, the point where the imaginary extension line of the light-transmissive member meets does not exist in the vertical upper portion of the sheet, and is biased to one side. When the eccentric manufacturing is performed as in c), d), and f) of the various methods of FIG. 4, the focus does not exist anywhere in the vertical upper part of the sheet, and the focus may exist outside the vertical upper part of the sheet surface. In this case, when looking at an object in the waist position, which is easy to operate by hand, such as a digital number key, focusing on a non-vertical portion of the viewing angle limit sheet, which is a kind of optical control sheet, Information can be determined only in the eyes of the user. Furthermore, when the light that passes through the angle-of-view sheet reaches the user's eyes without being aware of the eyes of the passing person, the readable information can be prevented from leaking to anyone standing next to him or to anyone using a camera mounted on his head. .

In addition, by cutting a composite laminate such as a lattice lattice or a fibrous laminate in the same manner as in Figure 2, it is possible to produce a light control sheet similar in function to the structure of Figure 1 d, one light impermeable member It is perpendicular to the surface of the sheet, and the other light-transmissive member is inclined with respect to the surface of the sheet, which is easier to manufacture than a cut body having the same 360 ° rotating cross-section structure. The light control sheet is not visible to people in the top, bottom, left and right, and the effect is that the visible portion is reduced as the distance is far away, it will be good to prevent the password leakage from the digital door lock. Furthermore, even if it is applied to a mobile phone or a notebook, it can make a clearer and more secure product than the existing vertical grid security film.

On the other hand, when the security is excellent and there is no need for security, one area, which is a work space, may be inconvenient. In this case, the electroconductive film may be contacted on both sides of the viewing angle limiting film produced using an electrochromic dye as a light impermeable member. It is also possible to use the effect that the light-transparent member is reversibly converted to the light-transmitting member in accordance with the electrical signal arranged.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is an exemplary one, and a person having ordinary knowledge in the art may various modifications and other equivalent embodiments therefrom. Will understand. And it will be apparent that the true technical protection scope of the present invention is defined by the claims below.

1: laminated body 2: cutting line
3: Jigsaw 4: Convergent
5: parallel (paralell) 6: bent cutting body
7: Bending direction 8: Guide
9: straight cutting member 10: bent cutting member
11: vertical movement direction 12: height adjustment device
13 swing arm 14 cutting member angle adjustment device
15 swing arm axis 16 stacking fixture

Claims (17)

Preparing a laminate in which the light transmitting member and the light transmitting member are alternately arranged:
Manufacturing a cut body by cutting the laminate using a cut member having a bent shape; And
And controlling the viewing angle by planarizing the cut body so that a virtual extension line by the light-transmissive member faces a region.
The cutting body is a method of manufacturing a light control sheet, characterized in that the upper surface and the lower surface is cut to form a shape bent in the same direction.
The method of claim 1,
The light impermeable member is changed to a light transmissive member using an electrochromic dye to release the security, characterized in that the manufacturing method of the light control sheet.
The method of claim 1,
The laminate is a method of manufacturing a light control sheet, characterized in that the lattice laminate.
The method of claim 1,
The laminate is a manufacturing method of a light control sheet, characterized in that any one selected from a spiral laminate, an angled spiral laminate, a ring-shaped laminate, an angled ring-shaped laminate.
The method of claim 1,
The laminate is a manufacturing method of a light control sheet, characterized in that the fibrous laminate.
The method of claim 1,
The cutting member is a manufacturing method of the light control sheet, characterized in that the section-shaped cutting member or curved cutting member.
The method of claim 6,
The cutting body is a method of manufacturing a light control sheet, characterized in that the cutting of the upper surface of the laminated body by a linear motion or a curved motion of the cutting member, and to cut again below the laminate.
The method of claim 7, wherein
The curved motion is a manufacturing method of the light control sheet, characterized in that the curved motion.
The method of claim 7, wherein
The horizontal cross section or the vertical cross section of the cut body is a manufacturing method of the light control sheet, characterized in that the cut asymmetrically.
The method of claim 7, wherein
The horizontal cross section or the vertical cross section of the cut body is a manufacturing method of the light control sheet, characterized in that the section structure or curved structure.
The method of claim 10,
The method of manufacturing a light control sheet, characterized in that it further comprises the step of polishing the laminate or cut body with an abrasive member.
The method of claim 10,
The planarization method of manufacturing a light control sheet, characterized in that performed at least one or more of heat treatment, pressure treatment, chemical treatment.
The method of claim 12,
And after the planarization, removing the at least a part of the light transmitting member by using at least one of heat treatment and chemical treatment of the light control sheet.
The method according to any one of claims 1 to 13,
The light control sheet is a manufacturing method of the light control sheet, characterized in that the viewing angle limit sheet.
The method according to any one of claims 1 and 3 to 13,
The light control sheet is a manufacturing method of the light control sheet, characterized in that the X-ray (X-ray) grid sheet.
An optical control sheet manufactured using the manufacturing method of the light control sheet of claim 14.
An optical control sheet manufactured by using the manufacturing method of claim 15 optical control sheet.

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