KR101002199B1 - Method for cutting laminated sheet, laminated sheet, optical element and image display unit - Google Patents

Abstract

The present invention provides a technique that can be processed so that the cut surface of the laminated sheet is in a good surface state, and can be processed into a shape that can distinguish the appearance by a simple configuration.

To this end, the cutting method of the laminated sheet for cutting the cut surface of the laminated sheet cut into a rectangular shape, characterized in that at least one of the four corners of the rectangular shape is cut and finished in an R shape. Preferably, the radius of R is formed in 0.8 mm-2.0 mm. Preferably, control of cutting is performed by imitation control. Preferably, by controlling the number of edges to be cut-off in R shape and the radius size of R, it is possible to identify the laminated sheet.

Laminated Sheets, Cutting

Description

METHOD FOR CUTTING LAMINATED SHEET, LAMINATED SHEET, OPTICAL ELEMENT AND IMAGE DISPLAY UNIT}

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the cutting method by the imitation system.

2 shows a cutting method (first method) that is not a copying method.

3 shows a cutting method (second method) that is not a copying method.

4 is a view showing a cutting example of a laminated sheet according to another embodiment.

Explanation of symbols on the main parts of the drawings

1: laminated sheet

1a, 1b, 1c, 1d: corner

2, 2A, 2B: rotary blade

3: imitation

4: imitation roller

5: rotary blade

The present invention provides a method of cutting a laminated sheet for cutting and finishing a cut surface of a laminated sheet cut into a rectangular shape, and an image display apparatus equipped with a laminated sheet cut by the method, and an optical film or an optical element obtained from the laminated sheet. It is about.

When cutting a laminated sheet (for example, formed of an optical film layer and an adhesive layer and sometimes referred to as a laminated film) to a predetermined rectangular size, for punching against the original of the long laminated sheet Cut with a blade or the like. When used as a polarizing plate, this laminated sheet is extended | stretched in the uniaxial or biaxial direction, and cut | disconnects parallel or substantially parallel to an extending | stretching direction, when cutting to rectangular size. In this case, fibrous (beard) fracture pieces may be generated on the cut surface. In addition, when an adhesive layer is included, an adhesive may be pushed out by the pressure at the time of a cutting | disconnection. It is necessary to remove the occurrence of such broken pieces and the pressure of the pressure-sensitive adhesive because it causes the quality to deteriorate in a later step.

Therefore, the cutting process of the anisotropic film as disclosed in Unexamined-Japanese-Patent No. 61-136746 (patent document 1) is known. In this processing method, after cutting is performed along the stretching axis of the film having anisotropy, the cutting tool is cut. Thereby, a fibrous fracture fragment etc. can be removed.

On the other hand, according to the recent demand for small quantity production of various kinds, there are various sizes in the size of the rectangle even when the laminated sheet is cut into a predetermined size. Therefore, depending on the difference in the size of the rectangle may need to identify the difference between the types, at first glance may not be able to distinguish. Therefore, it is preferable that there is a mark which can be visually distinguished besides the rectangular shape. For example, in the liquid crystal display device disclosed in Patent Document 2 below, an elliptically polarizing plate in which a polarizing plate and a phase difference plate are laminated and bonded to an outer surface of a substrate is formed, and an arc-shaped cutting portion is formed at a corner of the elliptical polarizing plate, and the radius of the cutting portion is formed. It is disclosed to make 2 to 8 mm. It is considered that by forming the corner portion in the shape of an arc in this manner, it can be identified by the presence or absence of an arc, for example.

[Patent Document 1] Publication 61-136746

[Patent Document 2] Japanese Unexamined Patent Publication No. 2002-72190

However, the process of the arc-shaped part in patent document 2 forms punching using a Thompson blade, as described in paragraph 0023. Therefore, in order to cope with a large number of varieties, it is necessary to prepare a lot of punching type, there is a problem in terms of cost. Moreover, since the arc shape by punching is formed, the problem that a fibrous (whisker-shaped) fracture fragment arises in a cut surface is not solved.

This invention is made | formed in view of the said situation, The subject is providing the technique which can be processed so that the cut surface of a laminated sheet may be in good surface state, and can also be processed into the shape which can distinguish an external appearance with a simple structure.

In order to solve the above problems, the cutting method of the laminated sheet according to the present invention,                     

As a cutting method of a laminated sheet for cutting and finishing the cut surface of the laminated sheet cut into a rectangular shape,

At least one of the four corners of the rectangular shape is cut and finished in an R shape.

According to this structure, the cut surface of the laminated sheet cut | disconnected in the rectangular shape is cut off. By cutting a cutting surface, it can be set as the favorable surface state in which an adhesive is not pushed out. Further, at least one of the four corners is formed into an R shape so that the external shape can be identified, and the R shape is also formed by cutting. By performing cutting, it can process into R shape, maintaining a favorable surface state. Moreover, by performing by cutting, the edge to which cutting should be performed can be arbitrarily selected among four edges. Therefore, the R shape of various shapes can be cut and can cope with small quantity production of many kinds. As a result, it is possible to provide a method for cutting a laminated sheet, which can be processed so that the cut surface of the laminated sheet is in a good surface state, and can be processed into a shape in which appearance can be identified with a simple configuration.

As a preferable embodiment of the present invention, the radius of R is formed to be 0.8 mm or more and less than 2.0 mm. The radius of the corner R disclosed in Patent Literature 2 is 2 mm or more, and if the cutting is performed at that size, the machining time is also taken because it is too large. Therefore, by setting it in the numerical range as mentioned above, processing time can be suppressed and it can be set to R of the magnitude which can distinguish external appearance.                     

As another preferable embodiment of this invention, the control of cutting is performed by imitation control. According to the cutting method by the imitation processing, the present inventors have found that the adhesive has an effect particularly in eliminating the sticking out of the adhesive.

As another suitable embodiment of the present invention, it is possible to control the number of the edges cut in the R shape and the radius of the R to control the lamination sheet.

Since four edges are formed in a rectangular laminated sheet, the edges which finish in R shape among these four can be arbitrarily set like 1-4. Moreover, also about the radius of R, a numerical value can be selected, for example in the range of 0.8 mm or more and less than 2.0 mm mentioned above. Therefore, by combining the number of these edges and the radius of R, it is possible to identify a plurality of kinds of laminated sheets.

In another preferred embodiment of the present invention, a plurality of cut surfaces for a plurality of laminated sheets are collected and cut in a state where a plurality of laminated sheets are stacked. By collecting and cutting a plurality of sheets, cutting can be performed efficiently.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Preferred embodiment of the cutting method of the laminated sheet which concerns on this invention is described using drawing. First, the specific method of the cutting method is demonstrated by FIG. 1, 2, 3. FIG. Fig. 1 shows a cutting method by a copying method, and Figs. 2 and 3 show an example of a cutting method which is not a copying method.                     

<Cutting method>

BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual diagram which shows the structure of the cutting device in the case of cutting the cut surface (cross section) of a laminated sheet. Only one rotary blade 5 as the cutting means is formed, and the roller 4 is formed by imitating the rotary blade 5 concentrically. On the other hand, the laminated sheet 1 is attached to the mimic 3 by suitable means. The mimic 3 and the laminated sheet 1 are comprised so that rotation movement (clockwise rotation in FIG. 1) is possible in the (theta) direction about the predetermined rotation axis center.

The copying roller 4 is always pressed against the copying 3. The pressing force can be applied by elastic support means such as a spring. The center of rotation of the imitation roller 4 and the rotary blade 5 does not move. Therefore, the cutting surface of the laminated sheet 1 can be cut | disconnected by rotating the imitation 3 in the state which pressed the imitation roller 4 with respect to the imitation 3. The laminated sheet 1 and the imitation are rectangular, for example rectangular or square.

Further, the rectangular laminated sheet 1 has four corners, of which two corners 1a and 1b are cut-controlled to be formed of R (arc arc). By setting the corners to R, the operator can easily handle it. In addition, by forming R at the edge, the laminated sheet 1 can be easily distinguished in appearance. The radius size of R is preferably set to be 0.8 mm or more and less than 2.0 mm. When the radius of R is increased to 2.0 mm or more, cutting takes time, which is not preferable. Moreover, when it is less than 0.8 mm, it will become difficult to distinguish externally.                     

When R is formed at four corners of a rectangle, there are four cases in which only one of four, only two, only three, and all four are formed. In addition, the radius of R can be set suitably within the said numerical range. Therefore, since a considerable number of combinations are obtained by combining the locations cut in the R shape among the four corners and the radius, it is possible to contribute to the identification of the laminated sheet 1. In the example of FIG. 1, the radius of the edge 1a is cut | disconnected so that it may become larger than the radius of the edge 3a. R shape cutting is not performed for the remaining one corner.

In addition, what kind of R shape cutting | disconnection is performed to the laminated sheet | seat 1 of which article number can be input, and can program beforehand. By controlling the rotary blade 5 and / or the mimic 3 on the basis of the program, cutting of the desired R shape can be performed.

Next, the cutting method which does not use the imitation 3 is demonstrated. 2 is an example provided with one rotary blade 2 (corresponding to a cutting means) in cutting the cut surface (cross section) of the laminated sheet 1. The rotary blade 2 is driven to rotate but the center of rotation does not move. Instead, the laminated sheet 1 is drive controlled to be able to move in the directions of X (horizontal), Y (vertical) and θ (rotation). By moving the laminated sheet 1 in each direction, the whole circumference | surroundings of a cut surface can be cut | disconnected, and an R-shaped cutting process can be given to an edge.

3 shows another embodiment, and two rotary blades 2 are formed. The rotary blade 2 is drive controlled to move only in the Y direction. In addition, the laminated sheet 1 is drive-controlled in the X * (theta) direction. According to this structure, first, the opposing long side 1x of the rectangular laminated sheet 1 can be cut simultaneously, and the opposing short side 1y can be cut simultaneously. What is necessary is just to change the space | interval of the two rotary blades 2 at the time of long side cutting and short side cutting.

According to the cutting method of FIGS. 2 and 3, three axes of X, Y, and θ are required for the control axes related to the laminated sheet and the rotary blade. However, since the imitation shape is not necessary, the presence or absence of the R shape and the size can be arbitrarily set simply by changing the control program, which is advantageous in terms of cost.

However, in the case of the cutting device by the imitation method shown in FIG. 1, since the control axis | shaft of two axes of Y and (theta) is enough, there exists an advantage that a control mechanism is simplified. Moreover, since only the operation | movement which presses the rotary blade 5 and the imitation roller 4 is enough, it is not necessary to carry out positioning with high precision, and cutting can be performed by simple control. Although the precision of cutting is determined by the dimensional accuracy of the imitation shape 3, the imitation shape 3 generally consists of metal materials, and sufficient precision can be obtained with the processing precision of the NC machine tool generally used. . In addition, since it is a physical positioning method in which the processing size is determined at the position when the imitation die 3 is pressed by the imitation roller 4, the reproducibility of processing is excellent. As for the dimensional change due to the wear of the mimic die 3 and the like, there is no problem because it is a level sufficiently acceptable compared to the processing accuracy of the laminated sheet.

When cutting the cut surface of the laminated sheet 1, it carries out in the state which laminated | stacked the several sheets in the thickness direction. When overlapping, it overlaps so that cutting surfaces may be aligned. Thereby, since several sheets of laminated sheet 1 can be processed simultaneously, processing efficiency improves. In the case of cutting, the laminated sheet 1 is cut into a predetermined shape such as a rectangle by a cutting device in advance in the previous step.

In Figs. 1 to 3, the R-shaped cutting processing is performed on the diagonal corners 1a and 1b, but various modifications are possible as shown in Figs. 4A, 4B and 4C. (a) performed R cutting on all four corners. The radius size is 1a = 1b> 1c = 1d. (b) is R cutting at three corners, and 1c = 1d> 1b. (c) is 1a> 1b> 1c.

<Specific example of laminated sheet>

As the lamination sheet, one laminated with various members by an adhesive can be used without particular limitation, but in the present invention, application to an optical member is suitable.

As an optical member, the polarizing plate which laminated | stacked the transparent protective film through the adhesive layer on the single side | surface or both surfaces of a polarizer, for example is mentioned.

A polarizer is not specifically limited, Various things can be used. As a polarizer, uniaxial stretching is carried out by adsorbing dichroic substances such as iodine or dichroic dye onto hydrophilic polymer films such as polyvinyl alcohol-based films, partially formalized polyvinyl alcohol-based films, and ethylene-vinyl acetate copolymer-based partially saponified films. And polyene-based alignment films such as dehydrated products of polyvinyl alcohol and dehydrochloric acid treated products of polyvinyl chloride. Among these, the polarizer which consists of dichroic substances, such as a polyvinyl alcohol-type film and iodine, is preferable. Although the thickness in particular of these polarizers is not restrict | limited, Usually, it is about 5-80 micrometers.

The polarizer which uniaxially stretched the polyvinyl alcohol-type film by iodine is dyed by dipping polyvinyl alcohol in the aqueous solution of iodine, for example, and can be produced by extending | stretching 3-7 times the original length. It can also be immersed in aqueous solution, such as a boric acid and potassium iodide, as needed. In addition, if necessary, the polyvinyl alcohol-based film may be immersed in water and washed before dyeing. By washing the polyvinyl alcohol-based film with water, the dirt and the blocking agent on the surface of the polyvinyl alcohol-based film can be washed, and the polyvinyl alcohol-based film is swelled to prevent nonuniformity such as staining. Stretching may be carried out after staining with iodine, stretching while dyeing, or dyeing with iodine after stretching. It can extend | stretch also in aqueous solution, such as a boric acid and potassium iodide, or in a water bath.

The transparent protective film formed on one side or both sides of the polarizer is preferably excellent in transparency, mechanical strength, thermal stability, moisture shielding, isotropy and the like. Examples of the material for the transparent protective film include polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetal cellulose and triacetyl cellulose, acrylic polymers such as polymethyl methacrylate, polystyrene and acrylonitrile. Styrene-type polymers, such as a styrene copolymer (AS resin), a polycarbonate polymer, etc. are mentioned. Further, polyethylene, polypropylene, polyolefins having a cyclo- or norbornene structure, polyolefin-based polymers such as ethylene-propylene copolymers, amide-based polymers such as vinyl chloride-based polymers, nylon and aromatic polyamides, imide-based polymers, and sulfides Phone type polymer, polyester sulfone type polymer, polyether ether ketone type polymer, polyphenylene sulfide type polymer, vinyl alcohol type polymer, vinylidene chloride type polymer, vinyl butyral type polymer, allylate type polymer, polyoxymethylene type polymer, Epoxy-based polymers, blends of the polymers, etc. are also examples of the polymer forming the transparent protective film. The thing which film-formed thermosetting type | mold ultraviolet-curable resins, such as an acryl type, a urethane type, an acryl urethane type, an epoxy type, and a silicone type, etc. is mentioned.

The thickness of a transparent protective film is generally 500 micrometers or less, and 1-300 micrometers is preferable. It is preferable to set it as 5-200 micrometers especially.

As a transparent protective film, cellulose polymers, such as a triacetyl cellulose, are preferable rather than a polarization characteristic, durability, etc. In particular, a triacetyl cellulose film is preferable. In addition, when forming a transparent protective film on both sides of a polarizer, the transparent protective film which consists of the same polymer material may be used in the front and back, and the transparent protective film which consists of different polymer materials etc. can also be used.

Further, the polymer film described in JP 2001-343529 A (WO01 / 37007), for example, a thermoplastic resin having a substituted and / or unsubstituted imide group in the (A) side chain, and a (B) side chain, And / or a resin composition containing a thermoplastic resin having an unsubstituted phenyl and a nitrile group. As a specific example, the film of the resin composition containing the alternating copolymer which consists of isobutylene and N-methyl maleimide, and an acrylonitrile styrene copolymer is mentioned. As the film, a film made of a mixed extrusion product of a resin composition can be used.                     

Moreover, it is preferable that a transparent protective film does not have coloring as much as possible. Therefore, in the film thickness direction represented by Rth = [(nx + ny) / 2-nz] · d (where nx and ny are the main refractive indices in the film plane, nz is the refractive index in the film thickness direction and d is the film thickness). The protective film whose retardation value is -90 nm-+75 nm is used preferably. By using what is the phase difference value (Rth) of -90 nm-+75 nm in such thickness direction, coloring (optical coloring) of the polarizing plate resulting from a protective film can be almost eliminated. The thickness direction retardation value Rth is more preferably -80 nm to +60 nm, particularly -70 nm to +45 nm.

The surface which did not adhere the polarizer of the said transparent protective film may be the thing which carried out the process for the purpose of a hard-coat layer, an antireflective process, sticking prevention, and diffused or antiglare.

The hard coat treatment is performed for the purpose of preventing scratches on the surface of the polarizing plate, and the like, for example, a method of adding a cured film having excellent hardness, sliding properties, etc., by suitable ultraviolet curable resins such as acrylic or silicone, to the surface of the transparent protective film. It can form by. The antireflection treatment is carried out for the purpose of preventing reflection of external light on the surface of the polarizing plate, and can be achieved by forming an antireflection film or the like according to the prior art. In addition, the sticking prevention treatment is performed for the purpose of preventing the adhesion with the adjacent layer.

In addition, antiglare treatment is performed for the purpose of preventing external light from being reflected on the surface of the polarizing plate and impairing the visibility of the polarizing plate transmitted light. For example, a sandblasting method or an embossing method for blending roughening methods or transparent fine particles It can form by providing a fine uneven structure to the surface of a transparent protective film by a suitable method, such as a system. Examples of the fine particles to be contained in the formation of the surface fine uneven structure include conductive inorganic materials composed of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide and the like having an average particle diameter of 0.5 to 50 µm, for example. Transparent microparticles | fine-particles, such as organic microparticles | fine-particles which consist of microparticles | fine-particles, a crosslinked or uncrosslinked polymer, etc. are used. When forming a surface fine uneven structure, the usage-amount of microparticles | fine-particles is about 2-50 weight part generally with respect to 100 weight part of transparent resin which forms a surface fine uneven structure, and 5-25 weight part is preferable. The antiglare layer may also serve as a diffusion layer (visual magnification function, etc.) for diffusing the transmitted light of the polarizing plate to enlarge vision.

The antireflection layer, the anti-sticking layer, the diffusion layer, the antiglare layer, and the like can be formed on the transparent protective film itself, and can be formed separately from the transparent protective layer as an optical layer.

Various aqueous adhesives can be used for the adhesive treatment of the said polarizer and a transparent protective film. Examples of the water-based adhesive agent include polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latexes, water-based polyurethanes, water-based polyesters, and the like. The adhesive is usually used as an adhesive consisting of an aqueous solution.

By containing the water-soluble crosslinking agent in the adhesive, the gel strength can be increased, and the adhesion can be improved. The polyvinyl alcohol-based adhesive may contain a water-soluble crosslinking agent such as boric acid, borax, glutaraldehyde, melamine, oxalic acid and the like. Although the addition amount of a water-soluble crosslinking agent is not specifically limited, Usually, it is 40 weight part or less with respect to 100 weight part of solid content of main materials, such as polyvinyl alcohol. Preferably it is 0.5-30 weight part. In addition, the adhesive may change the pH to advance the crosslinking. Furthermore, additives, such as preservatives, such as formic acid, a phenol, a salicylic acid, benzaldehyde, can be mix | blended with the said adhesive agent as needed at the time of preparation of the aqueous solution.

Bonding of a polarizer and a transparent protective film can be performed by a roll laminator etc. Although the thickness in particular of an adhesive layer is not restrict | limited, Usually, it is about 0.05-5 micrometers.

The said polarizing plate can be used as an optical film laminated | stacked with the other optical layer in practical use. Although it does not specifically limit about the optical layer, For example, it is used for formation of a liquid crystal display device, such as a reflecting plate, a semi-transmissive plate, a retardation plate (including wavelength plates, such as 1/2 or 1/4), a visual compensation film, etc. One layer or two or more layers may be used. In particular, a reflection type polarizing plate or a semi-transmissive polarizing plate in which a reflecting plate or a semi-transmissive reflecting plate is laminated on the polarizing plate of the present invention, or an elliptical polarizing plate or circular polarizing plate in which a retardation plate is further laminated on the polarizing plate, and a visual compensation film is further laminated on the polarizing plate. The polarizing plate in which the brightness improvement film is further laminated | stacked on the wide viewing angle polarizing plate which consists of, or a polarizing plate is preferable.

The reflective polarizer is formed by forming a reflective layer on the polarizer, and is used to form a liquid crystal display device of a type that reflects and displays incident light from the viewer side (display side). It is advantageous in that the liquid crystal display device can be made thinner. Formation of a reflective polarizing plate can be performed by a suitable method, such as the method of laying a reflective layer which consists of metal etc. on the single side | surface of a polarizing plate through a transparent protective layer etc. as needed.

As a specific example of a reflection type polarizing plate, what provided the reflection layer by laying the foil and vapor deposition film which consist of reflective metals, such as aluminum, on the single side | surface of the matte transparent protective film as needed. Moreover, what contains microparticles | fine-particles in the said transparent protective film to make surface fine concavo-convex structure, and has a reflective layer of a fine concavo-convex structure on it, etc. are mentioned. The reflective layer of the above-mentioned fine concave-convex structure has the advantage of being able to diffuse incident light by diffuse reflection to prevent directivity and glare, and to suppress variations in contrast. In addition, the fine particle-containing transparent protective film also has an advantage that the incident light and the reflected light are diffused at the time of transmission thereof to further suppress contrast variations. Formation of a reflective layer having a fine concavo-convex structure reflecting the surface fine concavo-convex structure of the transparent protective film may be performed by forming a metal into the transparent protective layer by an appropriate method such as a deposition method such as a vacuum deposition method, an ion plating method, a sputtering method, or a plating method. This can be done by a method of directly laying on the surface.

The reflecting plate can also be used as a reflecting sheet or the like formed by forming a reflecting layer on a suitable film conforming to the transparent film instead of the method of directly applying to the transparent protective film of the polarizing plate. In addition, the reflective layer is usually made of a metal, and the use form in which the reflective surface is covered with a transparent protective film, a polarizing plate, or the like prevents the reduction of the reflectance due to oxidation, and furthermore, the long-lasting point of the initial reflectance or the protective layer. It is preferable at the point of avoiding the separate laying of.                     

In addition, a semi-transmissive polarizing plate can be obtained by reflecting light in a reflection layer in the above, and making it into a semi-transmissive reflection layer, such as a half mirror which permeate | transmits. The transflective polarizing plate is usually formed on the back side of the liquid crystal cell, and when using a liquid crystal display device or the like in a relatively bright atmosphere, reflects the incident light from the viewing side (display side) to display an image, and in a relatively dark atmosphere, A liquid crystal display device of a type for displaying an image and the like can be formed using a built-in light source such as a backlight built in the back side of the transmissive polarizing plate. That is, the transflective polarizing plate can save energy of using a light source such as a backlight in a bright atmosphere, and is useful for forming a liquid crystal display device of the type that can be used using a built-in light source even in a relatively dark atmosphere.

An elliptical polarizing plate or circular polarizing plate in which a retardation plate is further laminated on the polarizing plate will be described. A retardation plate or the like is used to change linearly polarized light into elliptical polarization or circularly polarized light, to change elliptical polarization or circularly polarized light into linearly polarized light, or to change the polarization direction of linearly polarized light. In particular, a so-called quarter wave plate (also referred to as λ / 4 plate) is used as the phase difference plate which changes linearly polarized light into circularly polarized light or changes circularly polarized light into linearly polarized light. A half wave plate (also called a λ / 2 plate) is usually used when changing the polarization direction of linearly polarized light.

The elliptical polarizing plate is effectively used for black-and-white display without the coloring by compensating (preventing) the coloring (blue or sulfur) generated by the birefringence of the liquid crystal layer of the super twist nematic (STN) type liquid crystal display device. In addition, controlling the three-dimensional refractive index is preferable because it can compensate (prevent) coloration generated when the screen of the liquid crystal display device is viewed from an oblique direction. The circularly polarizing plate is effectively used, for example, in the case of arranging the color tone of an image of a reflective liquid crystal display device in which an image is a color display, and also has an antireflection function. Specific examples of the retardation plate described above include birefringence obtained by stretching a film made of a suitable polymer such as polycarbonate, polyvinyl alcohol, polystyrene, polymethyl methacrylate, polypropylene or other polyolefins, polyacrylates, and polyamides. The thing which supported the orientation film of a soluble film, a liquid crystal polymer, and the alignment layer of a liquid crystal polymer with a film, etc. are mentioned. The retardation plate may have a suitable retardation according to the purpose of use, for example, for the purpose of compensating coloring or vision due to birefringence of various wavelength plates and liquid crystal layers, or by laminating two or more kinds of retardation plates such as retardation. The optical characteristic may be controlled.

The elliptical polarizing plate and the reflective elliptical polarizing plate are obtained by laminating a polarizing plate or a reflective polarizing plate and a phase difference plate in an appropriate combination. Such elliptical polarizing plates may be formed by sequentially stacking them separately in the manufacturing process of the liquid crystal display device so as to be a combination of the (reflective type) polarizing plate and the retardation plate, but as described above, an optical film such as an elliptical polarizing plate may be used. In addition, the stability of the quality and the lamination workability is excellent, there is an advantage that can improve the manufacturing efficiency of the liquid crystal display device.

The visual compensation film is a film for widening the viewing angle so that an image can be seen relatively clearly even when the screen of the liquid crystal display device is viewed from a direction slightly inclined rather than perpendicular to the screen. Such a visually compensated retardation plate consists of the thing which supported alignment layers, such as a liquid crystal polymer, on orientation films, such as retardation film and a liquid crystal polymer, and a transparent base material, etc., for example. A normal retardation plate is a polymer film having birefringence stretched biaxially in the plane direction in the retardation plate used as a visual compensation film, whereas a polymer film having birefringence stretched uniaxially in the plane direction is used. A bidirectional stretched film such as a polymer having a birefringence, which is uniaxially stretched in the direction and controlled in the thickness direction also stretched in the thickness direction, is used. Examples of the inclined alignment film include those in which the polymer film is stretched and / or shrunk under the action of the shrinkage force by heating and the inclined orientation of the liquid crystal polymer is adhered to the polymer film. As the raw material polymer of the retardation plate, the same polymer as described in the above retardation plate is used, and for the purpose of preventing the coloring due to the change of the viewing angle based on the phase difference by the liquid crystal cell and the expansion of the viewing angle having good visibility, etc. One suitable one can be used.

Moreover, from the point of achieving a wide viewing angle of good visibility, the optical compensation retardation plate which supported the optically anisotropic layer which consists of the alignment layer of liquid crystal polymer, especially the diagonal alignment layer of discotic liquid crystal polymer with triacetyl cellulose film is used preferably. Can be.

The polarizing plate which adhere | attached the polarizing plate and a brightness improving film is normally formed in the back side of a liquid crystal cell, and is used. The brightness enhancement film exhibits a property of reflecting linearly polarized light on a predetermined polarization axis or circularly polarized light in a predetermined direction when natural light is incident by a backlight such as a liquid crystal display device or reflection from the back side, and transmitting other light. The polarizing plate laminated | stacked with the polarizing plate injects light from light sources, such as a backlight, and acquires the transmitted light of a predetermined polarization state, and reflects the light other than the said predetermined polarization state without transmitting. The light reflected from the surface of the brightness enhancing film is again inverted through a reflecting layer or the like formed on the rear side thereof, and reincident to the brightness enhancing film, and a part or all of the light is transmitted as light in a predetermined polarization state to increase the amount of light passing through the brightness enhancing film. In addition, the luminance can be improved by supplying polarized light that is hardly absorbed by the polarizer and increasing the amount of light that can be used for liquid crystal display image display. That is, when light is incident from the back side of the liquid crystal cell through a polarizer without using a brightness enhancement film, light having a polarization direction that does not coincide with the polarization axis of the polarizer is mostly absorbed by the polarizer, and thus the polarizer. It does not penetrate through. That is, although it depends on the characteristic of the polarizer used, about 50% of light is absorbed by a polarizer, and the quantity of light which can be used for a liquid crystal image display etc. decreases by that amount, and an image becomes dark. The brightness enhancement film repeats reflecting light having a polarization direction absorbed by the polarizer once in the brightness enhancement film without incident on the polarizer, and then reflecting it again through a reflective layer or the like formed on the back side, and reentering the brightness enhancement film, Since only the polarization of the polarization direction in which the polarization direction of the light reflected and inverted between the two passes through the polarizer is transmitted through the brightness enhancement film, the light is transmitted to the polarizer so that light such as a backlight can be efficiently displayed in the image of the liquid crystal display device. It can be used to brighten the screen.

A diffusion plate may be formed between the brightness enhancing film and the reflective layer. The light in the polarization state reflected by the brightness enhancement film is directed toward the reflective layer or the like, but the formed diffusion plate uniformly diffuses the light passing therethrough and at the same time resolves the polarization state to become a non-polarization state. In other words, the diffusion plate returns the polarized light to the original natural light state. The light in this non-polarized state, that is, the natural light state, is reflected through the reflecting layer or the like toward the reflecting layer or the like, and passes through the diffuser plate again and is reincident to the brightness enhancing film. Thus, by forming a diffuser plate which returns the polarization to the original natural light state between the brightness enhancing film and the reflective layer, the brightness of the display screen is maintained, while the variation of the brightness of the display screen is reduced, resulting in a uniform and bright screen. Can be provided. By forming such a diffusion plate, it is considered that the first incident light can be appropriately increased in the number of times of reflection repetition, so that a uniform bright display screen can be provided in harmony with the diffusion function of the diffusion plate.

As the brightness enhancing film, for example, a multilayer thin film of a dielectric material or a multilayer stack of a thin film film having different refractive index anisotropy, it exhibits a property of transmitting linearly polarized light of a predetermined polarization axis and reflecting other light. As the oriented film or the alignment liquid crystal layer is supported on the film substrate, an appropriate one such as exhibiting characteristics of reflecting any circularly polarized light in the left or right rotation and transmitting other light can be used.

Therefore, in the brightness | luminance improvement film of the type which permeate | transmits linearly polarized light of the said predetermined polarization axis, it can transmit efficiently, restraining the absorption loss by a polarizing plate by making the transmitted light into a polarizing plate and making it incident. On the other hand, in the luminance-enhancing film of the type which transmits circularly polarized light like a cholesteric liquid crystal layer, although it can be made to enter a polarizer as it is, in order to suppress absorption loss, the circularly polarized light is linearly polarized through a phase difference plate, and a polarizing plate It is preferable to make it enter. In addition, by using a quarter wave plate as the retardation plate, circularly polarized light can be converted into linearly polarized light.

A retardation plate functioning as a quarter wave plate in a wide wavelength range such as a visible light region is, for example, a retardation layer exhibiting retardation characteristics different from a retardation layer functioning as a quarter wave plate with respect to pale color light having a wavelength of 550 nm. It can obtain by the method of superimposing the retardation layer which functions as a / 2 wave plate. Therefore, the retardation plate arrange | positioned between a polarizing plate and a brightness improving film may consist of one layer or two or more retardation layers.

In addition, with respect to the cholesteric liquid crystal layer, it is possible to obtain the reflection of circularly polarized light in a wide wavelength range, such as a visible light region, by using a combination structure in which the reflected wavelengths are different and having two or more layers. Based on this, transmission circularly polarized light in a wide wavelength range can be obtained.

In addition, the polarizing plate, like the polarization separation type polarizing plate, may be formed by laminating a polarizing plate and two or three or more optical layers. Therefore, it may be a reflective elliptically polarizing plate or a semi-transparent elliptically polarizing plate in which the reflective polarizing plate, the transflective polarizing plate and the phase difference plate are combined.

Appropriate adhesion means, such as an adhesion layer, can be used for the said lamination. At the time of adhering the polarizing plate or the other optical film, these optical axes can be set to an appropriate placement angle in accordance with a desired phase difference characteristic or the like.                     

The adhesive layer for adhering with other members, such as a liquid crystal cell, can also be formed in the above-mentioned polarizing plate and the optical film which has laminated | stacked at least 1 layer of polarizing plates. The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer is not particularly limited, but for example, an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based or a rubber-based polymer may be appropriately selected and used. . In particular, an acrylic adhesive has excellent optical transparency, exhibits proper wettability, cohesiveness, and adhesive adhesion characteristics, and can be preferably used with excellent weather resistance, heat resistance, and the like.

In addition to the above, in terms of prevention of foaming or peeling phenomenon due to moisture absorption, reduction of optical characteristics due to thermal expansion difference, prevention of warping of the liquid crystal cell, and the formation of a high quality and durable liquid crystal display device, The adhesive layer which is low in moisture absorption and excellent in heat resistance is preferable.

The adhesive layer may be, for example, an additive of a natural or synthetic resin, in particular a tackifying resin, an additive of a filler made of glass fiber, glass beads, metal powder, other inorganic powders, or the like, or an adhesive layer such as a pigment, a coloring agent, an antioxidant, or the like. It may contain. Moreover, the adhesion layer etc. which contain microparticles | fine-particles and show light diffusivity may be sufficient.

Laying the adhesive layer on one side or both sides of a polarizing plate or an optical film can be performed by a suitable method. As an example, about 10 to 40 weight% of the adhesive solution which melt | dissolved or disperse | distributed or disperse | distributed a base polymer or its composition in the solvent which consists of a single substance or mixture of the appropriate solvents, such as toluene and ethyl acetate, is prepared, for example, and it is a flexible system Or a method in which a pressure-sensitive adhesive layer is formed directly on a polarizing plate or an optical film by an appropriate development method such as a coating method, or a method of forming an adhesive layer on a separator in accordance with the above, and transferring this onto a polarizing plate or an optical film and the like. have.

The pressure-sensitive adhesive layer can be formed on one side or both sides of a polarizing plate or an optical film as an overlapping layer of things such as different compositions or kinds. Moreover, when formed in both surfaces, it can also be set as adhesive layers, such as a composition, a kind, thickness, etc. which differ in the front and back of a polarizing plate and an optical film. The thickness of an adhesion layer can be suitably determined according to a purpose of use, adhesive force, etc., Generally, it is 1-500 micrometers, 5-200 micrometers is preferable, Especially 10-100 micrometers is preferable.

About the exposed surface of an adhesion layer, a separator is temporarily attached and covered for the purpose of the contamination prevention, etc. until it provides to practical use. Thereby, contact with an adhesion layer can be prevented in a usual handling state. As the separator, except for the above thickness conditions, for example, a plastic film, a rubber sheet, a paper, a cloth, a nonwoven fabric, a net, a foam sheet, a metal foil, a suitable thin body such as a laminate thereof, and a silicone-based or long-chain alkyl as necessary. The conventional thing suitable, such as what coat-processed with appropriate peeling agents, such as a fluorine type and a molybdenum sulfide, can be used.

In addition, in this invention, each layer, such as a polarizer which forms the said polarizing plate, a transparent protective film, an optical film, and an adhesion layer, etc., is a salicylic acid ester type compound, a benzophenol type compound, a benzotriazole type compound, The thing which gave ultraviolet absorption ability by the method, such as a process with ultraviolet absorbers, such as a cyanoacrylate type compound and a nickel complex salt type compound, may be sufficient.

The said optical member (polarizing plate, optical film, etc.) can be used suitably for formation of various apparatuses, such as a liquid crystal display device. Formation of the liquid crystal display device can be carried out in accordance with the prior art. That is, a liquid crystal display device is generally formed by appropriately assembling a component such as a liquid crystal cell, a polarizing plate or an optical film, and an illumination system, if necessary, to incorporate a driving circuit, but in the present invention, the polarizing plate or optical according to the present invention. It does not specifically limit except using a film, and can follow conventionally. Also about a liquid crystal cell, arbitrary types, such as TN type, STN type, (pi) type, can be used, for example.

An appropriate liquid crystal display device, such as a liquid crystal display device in which a polarizing plate or an optical film is disposed on one side or both sides of a liquid crystal cell, or a backlight or reflecting plate used in an illumination system, can be formed. In this case, the polarizing plate or the optical film according to the present invention can be formed on one side or both sides of the liquid crystal cell. When forming a polarizing plate or an optical film in both sides, these may be the same and may differ. In forming a liquid crystal display device, for example, a diffuser plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, a backlight, or the like may be provided with one or two or more layers at appropriate positions. Can be.

Next, an organic electroluminescent device (organic EL display device) will be described. In general, an organic EL display device forms a light emitting body (organic electro luminescent light emitting body) by sequentially stacking a transparent electrode, an organic light emitting layer, and a metal electrode on a transparent substrate. Here, the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative or the like and a light emitting layer made of a fluorescent organic solid such as anthracene, or such a light emitting layer and a perylene derivative. The structure which has various combinations, such as the laminated body of the electron injection layer which consists of these, or these or the hole injection layer, the light emitting layer, and the electron injection layer, is known.

In the organic EL display device, holes and electrons are injected into the organic emission layer by applying a voltage to the transparent electrode and the metal electrode, and energy generated by recombination of these holes and electrons excites the fluorescent material, and the excited fluorescent material When it returns to this ground state, it emits light on the principle of emitting light. The mechanism of intermediate recombination is the same as that of a general diode, and as can be expected from this, the current and the light emission intensity exhibit strong nonlinearity accompanied by rectification with respect to the applied voltage.

In the organic EL display device, at least one electrode must be transparent in order to emit light in the organic light emitting layer, and a transparent electrode formed of a transparent conductor such as indium tin oxide (ITO) is usually used as an anode. On the other hand, in order to facilitate electron injection and increase luminous efficiency, it is important to use a material having a small work function for the cathode, and metal electrodes such as Mg-Ag and Al-Li are usually used.

In the organic EL display device having such a configuration, the organic light emitting layer is formed of a very thin film having a thickness of about 10 nm. For this reason, like the transparent electrode, the organic light emitting layer transmits light almost completely. As a result, light incident on the surface of the transparent substrate during non-emission, and transmitted through the transparent electrode and the organic light emitting layer and reflected by the metal electrode again comes to the surface side of the transparent electrode, therefore, when viewed from the outside, The display surface looks like a mirror.

An organic EL display device comprising an organic electroluminescent light emitting body comprising a transparent electrode on the front side of an organic light emitting layer that emits light by application of a voltage and a metal electrode on the back side of the organic light emitting layer, wherein the organic EL display device is transparent. A polarizing plate can be formed on the surface side of an electrode, and a phase difference plate can be formed between these transparent electrodes and a polarizing plate.

Since the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected from the metal electrode, there is an effect that the mirror surface of the metal electrode cannot be seen from the outside by the polarization action. In particular, when the phase difference plate is constituted by a quarter wave plate, and the angle between the polarization direction of the polarizing plate and the phase difference plate is adjusted to π / 4, the mirror surface of the metal electrode can be completely shielded.

That is, only the linearly polarized light component is transmitted to the external light incident on the organic EL display device by the polarizing plate. This linearly polarized light is generally elliptically polarized by the retardation plate. In particular, the linearly polarized light becomes circularly polarized light when the retardation plate is a quarter wave plate and the angle between the polarizing plate and the retardation plate is? / 4.

The circularly polarized light penetrates the transparent substrate, the transparent electrode, and the organic thin film, is reflected by the metal electrode, passes through the organic thin film, the transparent electrode, and the transparent substrate, and becomes linearly polarized again on the phase difference plate. And since this linearly polarized light is orthogonal to the polarization direction of a polarizing plate, it cannot permeate | transmit a polarizing plate. As a result, the mirror surface of the metal electrode can be completely shielded.                     

<Other embodiments>

The rectangle in the present invention shall include not only rectangular but also square, trapezoid and parallelogram.

The cutting of the R shape in the present invention includes not only cutting with a rigid arc, but also cutting with an arc shape (curve shape close to the arc, for example, elliptical shape).

According to the cutting method of the present invention, it is possible to process the R shape while maintaining a good surface state in which the pressure-sensitive adhesive is not pushed out, and it is possible to arbitrarily select the corners to be subjected to cutting processing from four corners. As a result, it is possible to provide a method for cutting a laminated sheet, which can be processed so that the cut surface of the laminated sheet is in a good surface state, and can be processed into a shape in which appearance can be identified with a simple configuration.

Claims (10)

As a cutting method of a lamination sheet which cuts and cuts the cut surface of the lamination sheet formed from the optical film layer and the adhesion layer cut into the rectangular shape, At least one of the four corners of the rectangular shape is cut to the R shape, The lamination sheet is mounted in the imitation shape, the imitation roller is pressed against the imitation shape, and the cutting surface of the lamination sheet is cut while the imitation roller is pressed against the imitation shape so that the control of the cutting is controlled to the imitation control. A cutting method of a laminated sheet, characterized in that the execution. The method of claim 1, The radius R of the cutting method of the laminated sheet, characterized in that formed in less than 0.8mm 2.0mm. The method according to claim 1 or 2, And controlling the number of edges to be cut-finished into the R shape and the radius of the R, thereby enabling identification of the laminated sheet. The method according to claim 1 or 2, A plurality of cutting surfaces are collected by cutting a plurality of laminated sheets in a state of overlapping, the cutting method of a laminated sheet. The method of claim 3, wherein A plurality of cutting surfaces are collected by cutting a plurality of laminated sheets in a state of overlapping, the cutting method of a laminated sheet. delete delete delete delete delete

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