TW200412274A - Method for cutting laminating sheets and laminating sheets and image display device - Google Patents

Abstract

The present invention relates to a cutting method for laminating sheets by precision cutting the cut surface of the laminating sheets that are cut rectangularly. The cutting method includes: a step of stacking plural sheets in the width direction and clamping the laminating sheets from opposite top and bottom faces by a clamping mechanism; a step of cutting the laminating sheets along the cut face with a rotating cutting tool under the state where plural laminating sheets are clamped together. The total area that is clamped by the clamping mechanism is 5 to 40% of the total area at both faces, being twice of the rectangular area of the laminating sheets. The clamping area includes four corners of the rectangular area, resulting in a non-clamping area that is not clamped by the clamping mechanism along at lest one of the long and short sides of the rectangular area.

Description

200412274 发明, Description of invention:

TECHNICAL FIELD The present invention relates to a cutting method for a laminated sheet that is cut and finished by cutting a cut surface of a rectangular laminated sheet, and a laminated sheet cut by this method. An image display device having an optical film or an optical element obtained from the laminated sheet. L. Jt

When cutting a laminated sheet (for example, formed by an optical film layer and an adhesive layer, also referred to as a laminated film) to a predetermined rectangular size, the continuous rolling material of 10 laminated sheets is cut by using a die for a punch and the like. . When this laminated sheet is used as a polarizer, it is uniaxially or biaxially oriented and stretched, and when it is cut to a rectangular size, it is cut parallel or slightly parallel to the extending direction. In this case, fibrous (beard-like) fragments can be produced on the cut surface. When an adhesive layer is included, the adhesive may overflow due to the pressure at the time of cutting. The occurrence of the broken pieces or the overflow of the adhesive will cause 15 in the subsequent steps. This is the reason for reducing the quality and must be removed.

Therefore, a cutting processing method of an anisotropic film disclosed in Japanese Patent Application Laid-Open No. 61-136746 is currently known. In this processing method, a cutting process is performed along an extension axis of an anisotropic film, and then a cutting processing port is cut. Thereby, fibrous broken pieces and the like can be removed. 20 However, in the above-mentioned prior art, it cannot be said that cutting is performed with good accuracy including reproducibility. In other words, when the laminated sheet is cut into a rectangular shape and the cutting section is used for finishing, it is still necessary to include reproducible and precise dimensions for the finishing. That is, after cutting, it must be finished into a rectangle of a predetermined size. 5 [Declaration content] The present invention was created with the above facts, and includes reproducible and multiplying methods by _degree slices and / or, and multilayers cut by this method. 4 The problem of the filamentary film or optical element is to provide an image of a display device to solve the above-mentioned problems, and the method of cutting a rectangular laminated sheet includes: cutting of the paste processing method of the laminated layer of the present invention >! For a surface-cutting finisher, this cutting process clamps a plurality of laminated sheets from the upper and lower sides in a state where the plurality of laminated sheets are overlapped in a thickness direction, and 'clamps a plurality of laminated sheets by a clamping mechanism. In the step of cutting the surface in the state, the total clamping area of the upper and lower surfaces of the clamping mechanism by cutting the laminated sheet by a cutting mechanism is 2 times the rectangular area of the j-layer sheet, and is 5 ~. In the gripping field, the moment = four moments of the moment, forming the rectangle of the above-for the long side or-for the short side /, or β, there is a non-clamp that is not clamped by the two clamping mechanisms. Holding field. With this configuration, the laminated sheet is lost by the clamping mechanism in a state where a large number of sheets are stacked in the thickness direction. The pre-stored cutters of each laminated sheet are cut to a predetermined size. In the misalignment ^, the uppermost laminated sheet is sandwiched between the uppermost laminated sheet and the lowermost laminated sheet, and the present inventor found that by setting the total misaligned area of the upper and lower sides as follows, Can be cut with good accuracy. That is, if the area of the upper layer (the same below) is s, the total holding area is 5 to 4G% relative to 2x s. In addition, the four corners of the rectangular 200412274 laminated sheet are included at the time. In addition, instead of the full perimeter of the clamping rectangle, a non-clamping region is set for at least one of a pair of long sides or a pair of short sides constituting a rectangle. By adopting this clamping form, it is possible to provide a cutting and cutting method for a laminated sheet which can be reproduced and processed with good accuracy when the cut surface of the laminated sheet is cut and finished. In a suitable embodiment of the present invention, the clamping area on the lower side can be set larger than the clamping area on the upper side. The clamping area on the lower side is larger than that on the upper side, and it can be clamped in a stable state. 10 In another suitable embodiment of the present invention, a clamping mechanism located in a clamping field may use a soft material. The soft material can be used for clamping without damaging the laminated sheet. Brief Description of Drawings Figure 1 is a diagram showing a specific method of the cutting method. 15 FIG. 2 is a diagram showing a specific method of the cutting method (another embodiment). Figures 3 (a) to 3 (b) are diagrams showing the clamping area of the embodiment. Figures 4 (a) to 4 (b) are diagrams showing the clamping area by Comparative Example 1. Figures 5 (a) to 5 (b) are diagrams showing the clamping area of Comparative Example 2. [Embodiment 1 20] A suitable embodiment of a cutting method for a laminated sheet according to the present invention will be described with reference to drawings. First, the specific method of the cutting method will be described with reference to Figs. < Cutting method > Fig. 1 shows an example in which a rotary cutter 2 (equivalent to a cutting mechanism) is provided when cutting a cut surface (end surface) of a laminated sheet. Rotary tool 2 is driven by rotation 7 200412274 but its center of rotation does not move. Instead, the laminated sheet 1 is driven to move in the X (horizontal), Y (vertical), and Θ (rotation) directions. By moving the laminated sheet 1 in each of the above directions, the entire circumference of the cut surface can be cut. The laminated sheet 1 is rectangular, and is rectangular or square. 5 FIG. 2 shows another embodiment, which is provided with two rotary tools 2A, 2B.

The rotary tools 2A and 2B are driven and controlled so as to move only in the Y direction. The laminated sheet 1 is driven in the X and 0 directions. With this configuration, first, the opposite long sides 1 a of the rectangular laminated sheet 1 are simultaneously cut, and then the opposite short sides 1 b can be simultaneously cut. For long-edge cutting and short-edge cutting, you only need to change the interval between the two rotary tools 2A, 2B. When cutting the cut surface of the laminated sheet 1, a plurality of laminated sheets 1 are stacked. When the laminated sheet 1 is stacked, the cut surfaces are brought into a state of integration. Thereby, the laminated sheet 1 of a plurality of sheets can be processed at the same time, so the processing efficiency becomes better. When the cutting process is performed, the laminated sheet 1 is cut into a predetermined shape such as a rectangle by a cutting device in the previous step. Of course, the cutting method is not limited to the method shown in Figures 1 and 2.

Next, the clamping performed by the clamping mechanism will be described. In order to stabilize the cutting process, the stacked laminated sheets 1 must be sandwiched from the up-down direction. At this time, the clamping force directly received by the clamping mechanism acts on the upper surface of the uppermost laminated sheet 1 and on the lower surface of the lowermost laminated sheet 1. When stacking the laminated sheets 1, it is preferable to stack a plurality of sheets, especially 10 or more sheets. In addition, if the rectangular area of the laminated sheet 1 is S, the clamping area K of the upper and lower sides when the laminated sheet 1 is sandwiched is 2 times (2x S) the rectangular area: K = 2xSx (5 ~ 40%) With this, you can expect the accuracy and reproducibility of cutting. In addition, if the clamping area on the lower side is KI and the clamping area on the upper side is KK2, then K2K1 + KK2 can be made into a stable clamping state by making κ1> K2. When clamping, the four corners of the rectangle (indicated by lc in the second figure) must be clamped. With this, the clamping can be made more stable. Here, the four corners refer to the corner portion of the laminated sheet of the rectangle (square, rectangle) after cutting, which is more inside than the end edge. At least one of a pair of long sides la and a pair of short sides lb opposite to each other forms a non-clamping area with a dislocation mechanism. Since it is at least one, only one pair of long sides can be taken

la, only a pair of short sides lb, or any one of a pair of long sides la and a pair of short sides. By adopting these clamping methods, cutting accuracy can be improved and reproducibility can be improved. When clamping by the holding mechanism, the clamping material is preferably used for reading. The soft material can be a rubber-based material such as NBR, SBR, Si, or a plastic material such as a polymer resin. In addition, the hardness of these soft materials (hitting 8 to 8) ranges from 60 to 80. Better. If it is harder than this range, an indentation caused by the 15 clamping mechanism will be formed on the laminated sheet. If it is softer than this range, it will be caused by soft materials.

Deformation causes positional displacement, which reduces cutting accuracy. The pressing pressure at this time is set to 2 kg / cm2 to 10 kg / cm2. ≪ Specific examples of laminated sheets > The laminated sheets can be laminated with various members by an adhesive, and there is no particular limitation. 20 The present invention is applicable to optical members. The optical member may be, for example, a polarizer having a transparent protective film laminated on one or both sides of a polarizer with an adhesive layer laminated thereon. The polarizer is not particularly limited, and various types can be used. As a polarizer, for example, a hydrophilic polymer film such as polyethylene glycol, partially methylated polyethylenimide-based film, and ethylene 9 200412274 acetic acid copolymer type partially saponified film can absorb iodine or two. Uniaxial elongation of dichroic materials such as chromatic dyes, polyene-based oriented films such as dehydrated products of polyvinyl alcohol or dechlorinated products of polyvinyl chloride. Among these, a polarizer formed of a polyvinyl film and a dichroic substance such as iodine is preferred. The thickness of these polarizers 5 is not particularly limited, but is generally 5 to 80 / zm.

A uniaxially-extended polarizer in which a polyvinyl alcohol-based film is dyed with iodine can be produced, for example, by immersing a polyvinyl alcohol in an iodine aqueous solution and stretching it to 3 to 7 times its original length. If necessary, it can be immersed in an aqueous solution containing boric acid or potassium iodide. If necessary, the polyvinyl alcohol film is immersed in water and washed before dyeing. Washing the polyvinyl alcohol-based film with water not only cleans the dirt or clogging preventive agent on the surface of the polyvinyl alcohol-based film, but also has the effect of expanding the polyvinyl alcohol-based film to prevent unevenness such as staining. The extension system may be performed after dyeing with iodine, or may be extended at the same time as dyeing, or may be dyed with iodine after extension. It can also be extended in an aqueous solution such as boric acid or potassium iodide or in a water bath. 15 A single or double-sided transparent protective film provided on the aforementioned polarizer, with transparency,

Those having excellent mechanical strength, thermal stability, moisture shielding property, and isotropy are preferred. Examples of the material for the transparent protective film include polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diacetyl cellulose and triethyl cellulose, and polymers Acrylic polymers such as fluorenyl methacrylate, styrene polymers such as 20 polystyrene or acrylonitrile-styrene copolymer (AS resin), polycarbonate polymers, etc. In addition, polyolefins having polyethylene, polypropylene, ring-based or even plutonium structures, polyolefin-based polymers such as ethylene-propylene copolymers, vinyl chloride-based polymers, nylon or aromatic polyamides, etc. Fluorene-based polymer, fluorene-based imine-based polymer, fluorene-based polymer, polyether fluorene-based polymer, 10 I-plane polymer, polyphenylene sulfide-based polymer, ethylbenzene,聚合 -based polymerized vinyl polymer, polyvinyl butyral-based polymer, allyl 酽 dipolymer 'Polyoxymethylene-based polymer, epoxy-based polymer, 糸 糸 辇The three-mixed milk temple is also an example of a character that can be used to form the aforementioned transparent protective film. Examples thereof include thinning an acrylic or amine ester-based, acrylamine-based, epoxy-based, or oxygen-generating thermosetting or ultraviolet-curing resin. The thickness of the transparent protective film is generally less than 500 / zm, and ^ 3 ^ "^ 仏. Especially preferably 5 ~ 200 // m. The transparent protective film is based on polarizing characteristics or durability, etc. A cellulose-based polymer is preferred, especially a triethyl cellulose film. Also, # right is a case where a transparent protective film is provided on both sides of the polarizer, and the surface and the surface can be formed of the same polymer material. As the transparent protective film, a transparent protective film formed of different polymer materials, etc. may be used. The hydrate film described in JP 2001-343529 (W001 / 37007) may include, for example, (a) Thermoplastic resins having a substituted and / or unsubstituted acid amine group on the side chain, and (B) resin compositions of a thermoplastic resin having a substituted and / or unsubstituted benzyl group and a nitrile group on the side chain. Specific examples include A film containing a resin composition of an interactive copolymer of isobutylene and N-methylcisbutene diamidine and a propionitrile / styrene copolymer. The film can be a mixed extruded product made of a resin composition, etc. The formed film. Also 'transparent protective film with as little as possible The color is better. Therefore, it should be used: Rth = [(nx + ny) / 2-nz] · d (only, nx, ny are the main refractive index in the film plane, nz is the refractive index in the film thickness direction, d The film thickness direction indicates the phase difference in the film thickness direction-such as adding a protective film with ^ ~ + 75nm. By using the thickness of 200412274, the phase difference in the direction of -90nm ~ + 75nm can be almost eliminated It is caused by the coloring (optical dyeing) of the polarizer that protects Teng. The retardation value (Rth) in the thickness direction is preferably -80nm ~ + 60nm, especially _70nm ~ · ^ 45nm. The aforementioned transparent protective film The surface without the polarizer attached can also be treated with hard cover layer 5 or reflection prevention treatment, adhesion prevention or diffusion, or anti-glare treatment. The hard cover treatment is performed for the purpose of preventing damage to the surface of the polarizer. It is formed by attaching a hardened film with excellent hardness or sliding characteristics formed from suitable UV-curable resins such as acrylic and polylithic oxygen-based resins to the surface of a transparent protective film. The anti-reflection treatment is used to prevent polarizers. 10 reflections of light outside the surface , Can prevent the formation of the film according to the conventional reflection up to. Further, the adhesive-based prevention processing performed for the purpose of preventing adhesion between adjacent layers and by 01,520

The anti-glare treatment is performed in order to prevent external light from reflecting on the surface of the polarizer and prevent the polarizer from visually recognizing the transmitted light. For example, it can be roughened by lending / method or texture processing method, or A suitable method such as a method of mixing transparent fine particles is formed on the surface of the transparent protective film with a fine uneven structure. In the formation of the fine uneven structure on the surface, as the particles contained therein, for example, an average particle diameter of G.5 to 5G // m of dioxide, oxide, titanium oxide, hafnium oxide, tin oxide, indium oxide, Conductive inorganic fine particles in the form of osmium oxide, antimony oxide, etc., and transparent fine particles in the form of organic particles, such as crosslinked or uncrosslinked polymers. When forming the fine uneven structure on the surface, the amount of fine particles used is 100 to the weight of the transparent tree forming the fine uneven structure on the surface. It is generally 2 to 50 parts by weight, and preferably 5 to 25 parts by weight. The anti-glare layer can also be used as a diffusion layer (enlargement of the viewing angle function, etc.), and the polarizer 12 200412274 can diffuse the light to expand the viewing angle. The anti-reflection layer, the anti-adhesion layer, the diffusion layer, or the anti-glare layer may be provided as a transparent protective film, or may be provided as an optical layer for other purposes as a separate unit from the transparent protective film. 5 In the aforementioned polarizing lens and transparent protective film, various water-based adhesives can be used. Examples of the water-based adhesive include polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latexes, water-based polyurethanes, and water-based polyesters. The aforementioned adhesive is generally used as an adhesive formed from an aqueous solution.

By including a water-soluble crosslinking agent in the aforementioned adhesive, the gel strength can be increased by 10, and the adhesiveness can be improved. The polyvinyl alcohol-based adhesive may contain a water-soluble crosslinking agent such as boric acid, borax, glutaric acid, melamine, and oxalic acid. The amount of the water-soluble cross-linking agent to be added is not particularly limited, and it is usually preferably from 0.5 to 30 parts by weight relative to 100 parts by weight of the solid content of the main material such as polyvinyl alcohol, and less than 40 parts by weight. Moreover, in order to make crosslinking progress, the said adhesive agent may change pH. Furthermore, when preparing this aqueous solution, preservatives such as formic acid, phenol, salicylic acid, and benzaldehyde may be mixed with the aforementioned adhesive as necessary.

Lamination of the polarizer and the transparent protective film can be performed by a roll laminator or the like. The thickness of the adhesive is not particularly limited, and is usually 0.05 to 5 / zm. The aforementioned polarizer can be used as an optical 20 film laminated with other optical layers when practical. The optical layer is not particularly limited, and one or more layers such as a reflection sheet or a semi-transmissive sheet, a retardation film (including a 1/2 or 1/4 wavelength plate), a viewing angle compensation film, and the like can be used for formation. An optical layer of a liquid crystal display device or the like. In particular, a reflective polarizer or a transflective polarizer with a reflective sheet or a transflective reflective sheet further laminated on the polarizer of the present invention, an elliptical polarizer or a circular polarizer, polarized light with a retarder 13 200412274 laminated on the polarizer. A wide-viewing-angle polarizer with a viewing-angle compensation film further laminated on the sheet, or a polarizing film with a brightness enhancement film further laminated on the polarizer is preferable. Reflective polarizers are those that have a reflective layer on the polarizer. They are used to form a type of liquid crystal display device that reflects the incident light emitted from the visual recognition side (display side). It has a built-in backlight and can be omitted Light source, easy to achieve thinness of liquid crystal display device, etc. The formation of the reflective polarizer can be performed by a suitable method such as a method of attaching a reflective layer made of metal or the like to one side of the polarizer through a transparent protective layer or the like, as needed. 10 Specific examples of reflective polarizers include, for example, a metal film or a vapor-deposited film made of a reflective metal such as aluminum on one side of a transparent protective film that has been subjected to a matte treatment as needed to form a reflective layer. Wait. Further, the transparent protective film may include fine particles having a fine uneven structure on the surface and a reflective layer having a fine uneven structure on the surface. The above-mentioned reflective layer having a fine uneven structure has the advantages of diffusing incident light by diffuse reflection to prevent directivity or dazzling appearance, and suppressing uneven light and dark sentences. In addition, a transparent protective film containing fine particles has the advantage that incident light and reflected light can be diffused when the protective film is transmitted through the protective film, and the unevenness of light and darkness is further suppressed. The formation of the fine uneven structure reflecting layer reflecting the fine uneven structure on the surface of the transparent protective film can be performed by an appropriate method such as a vacuum evaporation method, an ion 20 plating method, a sputtering method, or an electroplating method. A method of directly adding a metal to the surface of the transparent protective layer is performed. The reflective sheet may be provided with a reflective layer on a suitable film according to the transparent film, and used as a reflective film, instead of the method of directly providing the transparent protective film on the polarizer described above. In addition, since the reflective layer is usually formed of metal, if the reflecting surface is covered by a transparent protective film or a polarizer, etc., the use form can prevent the reflectance from being lowered due to oxidation, and can be used for a long time. It is more suitable to maintain the initial reflectance and avoid the need for an additional protective layer. A semi-transmissive polarizer can be obtained by forming a semi-transmissive reflective layer such as a translucent mirror that reflects light through the reflective layer 5 and transmits the light. The transflective polarizer is usually located on the back side of the liquid crystal cell, and can be used to form liquid crystal display devices such as the following types. That is, when used in a relatively bright environment, it can be seen from the visual recognition side (display side). The incident light is reflected to display the image, and in a relatively dark environment, the type of image is displayed using a built-in light source such as a backlight built into the back side of the transflective polarizer. That is, in forming such a bright environment,

The light source is used as an energy source for a light source, and a light sheet is useful even on a liquid crystal display device or the like that can be used with a built-in light source. In the environment, the semi-transmissive polarization is 15 20. Then, the elliptical or circular polarizer formed by the retardation film laminated on the polarizer will be explained. When changing linearly polarized light to elliptically polarized light, or changing elliptically or circularly polarized light to linearly polarized light, or changing linearly polarized light, > light direction ', a retardation film can be used. In particular, for a phase difference film that changes linearly polarized light to Xiaguang or circularly polarized light to linearly polarized light, the long film (also called λ / 4 film) can be used. The 1/2 wavelength plate (also known as λ / 2 is used to change the polarization direction of linear polarized light. The elliptical polarizer can compensate (prevent) the super-twisted nematic (STN) type wide-angle display device ’s liquid crystal layer due to birefringence Coloring (cyan or yellow), there may be bite 2 in the aforementioned black and white display without coloring, etc. More, control secondary _ 4 :: It can also compensate (prevent) the image of the liquid crystal display device viewed from an oblique direction.

15 200412274

The color is more suitable. The circular polarizer is effective for adjusting the color tone of an image of a reflective liquid crystal display device in which an image is changed to a color display, and also has a function of preventing reflection. Specific examples of the above retardation film may include suitable polymers such as polycarbonate, polyvinyl alcohol, polystyrene, polymethylmethacrylate, polypropylene or other polyolefins, 5 polyallyl esters, and polyamides. The formed film is a birefringent film or an alignment film of a liquid crystal polymer, and an alignment layer of the liquid crystal polymer is supported by the film. The retardation film may have a suitable retardation according to various usage purposes; the so-called various usage purposes are, for example, for the purpose of compensating for coloration or viewing angle caused by the birefringence of various wavelength plates or liquid crystal layers, and the retardation film may also be It is a product with two or more types of retardation film with 10 layers to suppress the optical characteristics such as retardation. The elliptical polarizer or the reflective elliptical polarizer is a laminate of a polarizer, a reflective polarizer, and a retardation film in an appropriate combination. The elliptical polarizer and the like can be formed by sequentially stacking (reflective) polarizers and retardation films in the manufacturing process of a liquid crystal display device, and combining these sheets, but if they are prepared in advance as described in 15 Optical films such as elliptical polarizers have the advantages of excellent quality stability and lamination workability, and can improve the manufacturing efficiency of liquid crystal display devices. The viewing angle compensation film is used to expand the viewing angle, and when the image of the liquid crystal display device is viewed from a direction that is not perpendicular to the screen, but from a slightly inclined direction, the picture 20 surface looks more vivid. Such a viewing angle compensating retardation film is formed by, for example, a retardation film, an alignment film such as a liquid crystal polymer, or an alignment layer such as a liquid crystal polymer on a transparent substrate. Generally, a retardation film is a polymer film having uniaxially-extending birefringence in the plane direction. In contrast, a retardation film used as a viewing angle compensation film is used in a birefringent film having biaxially extending in the plane direction. 16 200412274 A polymer film, or a birefringent polymer that controls the refractive index in the thickness direction by uniaxially extending in the plane direction and also in the thickness direction, or a two-direction stretch film such as an obliquely oriented film. The oblique facing film may be, for example, a heat shrinkable film followed by a polymer film and heated to generate a shrinking force. Under the action of the shrinking force, the polymer film is stretched for 5 treatments and / or shrinking treatments, or the liquid crystal polymer is tilted. Orientees, etc. The raw material polymer of the retardation film is the same as the polymer described previously in the retardation film, and can be used to prevent: coloration caused by the change in the visual recognition angle due to the phase difference of the liquid crystal cell, etc., It may be suitable for purposes such as better visual recognition and widening of the viewing angle. 10 In addition, based on the point of view of achieving an enlarged visual recognition angle, etc., an alignment layer in which a liquid crystal polymer is supported by a triethyl cellulose film; particularly, an alignment layer formed by a discotic liquid crystal polymer Optically-compensated retardation film of an optically anisotropic layer. Polarizers that have been bonded with polarizers and brightness-enhancing films are usually used inside the 15 cell of the liquid crystal. The brightness-improving film has such characteristics that when a backlight or natural light of a liquid crystal display device or the like is incident by reflection from the back side, that is, linearly polarized light of a predetermined polarization axis or circularly polarized light in a predetermined direction is transmitted, and other light is transmitted. In the case of a polarizer in which a brightness enhancement film and a polarizer are laminated, light from a light source such as a backlight is incident to obtain transmitted light in a predetermined polarized state, and at the same time, light outside the predetermined polarized light 20 state is reflected without transmission, so that The light reflected from the surface of the brightness enhancement film is inverted through a reflective layer provided on the rear side, etc., and then incident on the brightness enhancement film, so that it partially or entirely transmits light as a predetermined polarization state to increase the amount of light transmitted through the brightness enhancement film. At the same time, the polarized light that is difficult to be absorbed by the polarizer is supplied to increase the amount of light that can be used for liquid crystal display image display and the like, thereby increasing the brightness. That is, when the light is incident from the inside of the liquid crystal cell through a polarizer without using a party-strengthening film, almost all light having a polarization direction that is inconsistent with the polarization axis of the polarizer is absorbed by the polarizer, and Does not pass through polarizers. That is, although it will vary according to the characteristics of the polarizer used, about 5G% of the light will be absorbed by the polarizer. In this state, the amount of light that can be used for liquid crystal image display and the like is reduced, and the screen will be darkened. . The brightness enhancement film can repeatedly cause the light having the polarization direction absorbed by the polarizer not to pass through the polarizer and be temporarily reflected by the brightness enhancement film. It can also be inverted and incident on the brightness enhancement film through a reflective layer provided on the rear side. This action only changes the polarized light direction of the reflected and inverted light between the two into a polarizer that can be supplied to the polarizer through the brightness enhancement film through the polarized direction of the polarizer, so that light such as backlight can be efficiently applied to the liquid crystal. The display of the image of the display device makes the screen brighter. A diffusion sheet may be provided between the brightness enhancement film and the reflective layer. Although the light of the reverse polarized light from the brightness-enhancing film is directed toward the above-mentioned reflective material, the diffuser sheet has been set to evenly diffuse the passing light while eliminating the polarized state, and it becomes a non-polarized state. That is, the diffused light M restores the polarized light to the original natural light. The non-polarized light, that is, the light in the natural green state, is repeatedly directed toward the reflective layer, etc., and is reflected by the diffusive material, and then passes through the process of diffusion # re-intensity_brightness film again. By arranging the diffuser between the brightness enhancement and the above-mentioned reflection layer to make the light shame become natural light, it can maintain the brightness of the display day, and reduce the uneven brightness of the display on the same day, providing uniform brightness. Day surface. By setting the expansion film, the first incident light can appropriately increase the number of repeated reflections and complement the diffusion function of the expansion film, so it can provide a uniform and bright display screen. As the aforementioned brightness-improving film, for example, a multilayer laminated body suitable for a film having a large number of dielectrics or films having different refractive index anisotropy can be used to display the characteristics of other light reflections through the linearly polarized light of a predetermined material light car. Or, if it is a thin film-based helical liquid crystal polymer alignment film or the alignment liquid crystal layer, it reflects 5 A or right-handed circular polarized light on either side and displays other light transmission characteristics. Q: By allowing the linearly polarized light of the predetermined polarization axis to pass through the lifting film, the π degree of Iyama, and the polarization axis caused by the transmitted light in this state to be collected on the polarizer t, can be prevented from occurring due to the polarizer. Absorb the loss and make it efficient at the same time ^ On the one hand, the type of circularly polarized light such as the spiral liquid crystal layer is dropped ^ can be made to shine on the polarizer in this state, but the base φ Αυ is closed The stagnation point is lost, and the circularly polarized light is linearly polarized through a phase difference plate and is incident on the polarizer. The phase polarization is converted into linear polarization by using a quarter-wave plate. ® A retardation film that functions as a 1/4 wavelength plate in a wide wavelength range such as the visible light range. For example, a retardation layer that functions as a 5 ι / 4 wavelength plate with a light color of 550 nm relative to a wavelength can be used. Phases and chirps that show other retardation characteristics, such as the way in which retardation layers that function as a 1/2 wavelength plate are superimposed, are available. Therefore, the retardation film disposed between the polarizer and the brightness-improving film can also be formed from one or more retardation layers. In addition, the spiral liquid crystal layer is made of a combination of different reflection wavelengths and a structure of two or more layers, which can obtain reflective circularly polarized light in a wide wavelength range such as the visible light field. As a result, a circularly polarized light having a wide wavelength range is obtained. Further, the polarizer may be formed of a laminated polarizer / two or three or more optical layers, as in the above-mentioned polarized light separation type polarizer. Therefore, it may be a reflective elliptical polarizer or a semi-transmissive elliptical polarizer that combines the above-mentioned 19 200412274 reflective polarizer or semi-transmissive polarizer with a retarder. Appropriate bonding means such as an adhesive layer can be used on the laminate. When following the aforementioned polarizer or other optical film, these optical axes can be arranged at an appropriate angle according to the phase difference characteristic of the objective. The aforementioned polarizer, or an optical film in which at least one polarizer is laminated, may be provided as an adhesive layer for adhering to other members such as a liquid crystal cell. The adhesive for forming the adhesive layer is not particularly limited, and for example, an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine atom-based system, or a rubber-based system can be appropriately selected. Other polymers are used as matrix polymers. In particular, acrylic adhesives are excellent in optical transparency, exhibit moderate adhesion characteristics of wettability, agglutination, and adhesion, and are excellent in terms of financial climate and thermal properties, and are particularly suitable for use. In addition to the above, in addition to preventing foaming or peeling due to moisture absorption, etc., preventing degradation of optical characteristics due to thermal expansion, etc., or warping of liquid crystal cells, it has high quality and excellent durability. In terms of the formability of the liquid crystal display device, it is preferable to use an adhesive layer having low moisture absorption and excellent heat resistance. The adhesive layer may contain, for example, natural or synthetic resins, in particular, adhesives, resins, glass fibers, glass beads, metal powders, fillers made of other inorganic powders, pigments, colorants, or antioxidants Additive can be added to 20 layers. Further, it may be an adhesive layer or the like which contains fine particles and exhibits light diffusivity. When an adhesive layer is attached to one or both sides of a polarizer or an optical film, it may be performed in an appropriate manner. For example, it is possible to adjust the adhesion of about 10 to 40% by weight of the matrix polymer or its composition dissolved or dispersed in a solvent or a mixture of suitable solvents such as toluene or ethyl acetate 20 200412274. Agent solution, which is directly attached to the polarizer or the optical film by a suitable expansion method such as a casting method or a coating method, or forms an adhesive layer on the release film according to the foregoing, and then moves it to polarized light On-chip or optical film. 5 Adhesive layer can also be set on the polarizer as an overlapping layer of different compositions or types

Or one or both sides of the optical film. In addition, when it is provided on both sides, an adhesive layer with a different composition, type, or thickness may be formed on the surface of the polarizer or optical film. The thickness of the adhesive layer can be appropriately determined according to the purpose of use or adhesion, and is generally 1 to 500 // m, preferably 5 to 200 // m, and more preferably 10 to 100 // m. 10 Before being put into practical use, the release surface of the adhesive layer is temporarily covered with a release film for the purpose of preventing contamination. This prevents contact with the adhesive layer in the usual processing state. In addition to the above-mentioned thickness conditions, a suitable film such as a plastic film, rubber sheet, paper, cloth, non-woven fabric, net, foamed sheet or metal sheet, a laminate of these sheets, etc. may be used as the release film. Suitable strippers such as oxygen-based, 15-chain alkyl-based, fluorine or molybdenum sulfide, etc., are applied according to the conventionally suitable ones.

Moreover, in the present invention, the polarizer, transparent protective film, optical film, or the like, or the adhesive layer forming the above-mentioned polarizer can be exemplified by a saurate compound, a benzyl compound, and a benzotriazine sigma system. The compound or a cyanoacrylic acid compound, a nickel 20 sodium salt compound, and the like are treated by an ultraviolet absorbent, etc., so that they have ultraviolet absorption energy and the like. The aforementioned optical member (a polarizer, an optical film, etc.) can be suitably used for forming various devices such as a liquid crystal display device and the like. The formation of a liquid crystal display device can be performed based on a conventional method. That is, a liquid crystal display device is generally formed by appropriately combining a liquid crystal cell with component parts such as an adhesive film of 21 200412274 and a lighting system in accordance with requirements, and incorporating the driving circuit into the driving circuit. The polarizer or optical film formed by the present invention is not particularly limited in this respect, and may be based on a conventional method. As the liquid crystal cell, any of five types such as a TN type, an STN type, or a 7Γ type may be used.

Suitable liquid crystal display devices can be formed on one or both sides of the liquid crystal cell with a polarizer or an optical film, or a backlight device or a reflector used in a lighting system. At this time, the polarizer or optical film formed by the present invention can be disposed on one side or both sides of the liquid crystal cell. When polarizers or optical films 10 are provided on both sides, these may be the same or different. Furthermore, when forming a liquid crystal display device, suitable parts such as a diffusion sheet, an anti-glare layer, an anti-reflection film, a protective sheet, a holmium array, a lens array film, a light diffusion sheet, and a backlight can be arranged at appropriate positions. One or more layers.

Next, an organic electroluminescence device (organic EL display device) will be described. Generally speaking, an organic EL display device is a light emitting body (organic electroluminescent light emitting body) in which a transparent electrode, an organic light emitting layer, and a metal electrode are sequentially laminated on a transparent substrate. Here, the organic light emitting layer is a laminate of various organic thin films. For example, a positive hole injection layer made of a triphenylamine derivative and the like and a light emitting layer made of a fluorescent organic solid such as onion are known. Or a laminate of such an electron injection layer formed by such a light-emitting layer and a perillene 20 derivative, or even a laminate of a positive hole injection layer, a light-emitting layer, and an electron injection layer. The organic EL display device emits light by the following principle, that is, by applying a voltage to the transparent electrode and the metal electrode, positive holes and electrons are injected into the organic light emitting layer, and then the energy generated by the recombination of these positive holes and electrons is used. Excited fluorescent substance 22 200412274 mass, when the excited glory substance returns to ground state, it will radiate light and emit light. The recombination mechanism on the way is the same as that of ordinary diodes, so it can be predicted that the current and the luminous intensity are relative to the applied voltage—a strong nonlinearity with rectification. In an organic el display device, in order to take out the light emission in the organic light emitting layer, at least one side of the electrode must be transparent. Generally, a transparent electrode formed of a transparent conductor such as an oxide contact (ιτ〇) is used as the anode. On the other hand, in order to facilitate electron injection and improve luminous efficiency, it is important to use a material with a small jade function as a cathode. Usually, metal electrodes such as Mg_Ag and A1_u are used. In the organic EL display device having such a configuration, the organic light emitting layer is formed of an extremely thin film having a thickness of < 10 nm. Therefore, the organic light-emitting layer can transmit light as much as the transparent electrode. As a result, light that is incident from the surface of the transparent substrate and reflected by the metal electrode through the transparent electrode and the organic light-emitting layer at the time of non-emission will pass through the surface of the transparent substrate again. Therefore, when visually recognized from the outside, the display surface of the organic el display device It looks like a mirror. 15 There is a borrow; ^ a transparent electrode is provided on the surface side of the organic light-emitting layer that applies voltage to emit light. 4 Organic light-emitting organic EL display device with a metal electrode on the inner side of the organic light-emitting layer can be used as a transparent electrode. A _ polarizer is provided on the surface side, and a retardation film is provided between the transparent electrode and the polarizer. Since the retardation film and the polarizing film have a function of polarizing light that is incident from the outside and reflected by the metal electrode 20, the effect of making the mirror surface of the metal electrode invisible from the outside can be produced by the polarizing effect. In particular, a phase difference plate is constituted by a 1/4 wavelength plate and the angle formed by the polarizing plate and the polarization direction of the phase difference plate is adjusted to redundant / 4, so that the mirror surface of the metal electrode can be completely shielded. That is, the external light incident on the organic EL display device is transmitted only by a linearly polarized component due to the polarizer. This linearly polarized light is generally made into an elliptical polarized light by a retardation film '. However, when the retardation film is a 1/4 wavelength plate and the angle formed by the polarization direction of the polarizer and the retardation film is 7Γ / 4, it becomes circularly polarized light. The 50-degree circularly polarized light passes through the transparent substrate, the transparent electrode, and the organic thin film and is reflected by the metal electrode, and then passes through the organic thin film, the transparent electrode, and the transparent substrate, and becomes linearly polarized again in the retardation film. Since the linearly polarized light is perpendicular to the polarization direction of the polarizer, it cannot pass through the polarizer. As a result, the mirror surface 0 of the metal electrode can be completely shielded. (Examples) Next, examples and comparative examples will be described. Fifty polarizing films for liquid crystal display devices, which require processing accuracy or precision, are to be laminated and laminated in the thickness direction. The rectangular size of the laminated sheet is 255mm x 195mm. The finished size after cutting is 250mmx 190mm. Now, Figure 3 illustrates the clamping area performed by the embodiment (press) 15 20

Shape). Figure 3 shows the clamping area on the upper side and the inflammation holding area on the upper side. The upper and lower corners are included in the clamping area.

It is aimed at the opposite—to the long side 3, and the short side% to form a non-clamping area. The side system forms a mismatch area with the diagonal along the full perimeter of the rectangle. Here ... The four corners and full perimeter of the holding position refer to the position after cutting plus 1 'when the laminated sheet is held at that position, and the planned cutting part of the laminated sheet: the state where the line area is exposed. However, when a soft material is used, it can also be used together with the fixture and the laminate, such as Bu Xiao, and Bu Xin__ is the face-to-face miscarriage area is Sx0.12 (12%), which is called the total. ) The clamping area on the lower side is 24 200412274. Figure 4 shows the clamping area of Comparative Example 1. As shown in (a), the entire perimeter of the upper rectangle is clamped, and (b) is the same. (B) The configuration is the same as that of the embodiment. The clamping area on the upper side is 40%, the clamping area on the lower side is 48%, and the total is 44%. 5 Figure 5 shows the clamping area of Comparative Example 2. As shown in (a), only the full perimeter of the rectangle is held on the upper side, and (b) is the same as the first comparative example. The clamping area on the upper side is 26%, the clamping area on the lower side is 48%, and the total is 37%. Next, the evaluation results when cutting is performed are shown below. For the MD direction (extending direction) and the TD direction (direction perpendicular to the extending direction), the standard deviation when 250 mm > < 190 mm as the above-mentioned target size is obtained is obtained. The number of samples is n = 15. Table 1 Standard deviation MD direction TD direction Example 0.025 0.019 Comparative example 1 0.033 0.025 Comparative example 2 0.03 0.023 As can be seen from the table, the value of the unevenness in the examples is small. In Comparative Example 1, since the clamping area was too large, the unevenness was large. In Comparative Example 2, although the clamping area is appropriate, since the entire circumference of the rectangle on the upper side is the clamping area, the unevenness becomes large. Therefore, it is clear that the cutting method according to the present invention is excellent. The gripping field shown in Fig. 3 shows an example of the present invention, but the present invention is not limited to this. 20 [Brief description of the drawings] Figure 1 is a diagram showing the specific method of the cutting method. 25 200412274 Figure 2 is a diagram showing a specific method of the cutting method (other embodiments). Figures 3 (a) to 3 (b) are diagrams showing the clamping area of the embodiment. Figures 4 (a) to 4 (b) are diagrams showing the clamping area by Comparative Example 1. Figures 5 (a) to 5 (b) are diagrams showing the clamping area of Comparative Example 2. 5 [Representative symbol table of main components of the drawing] 1… Laminate la… Long side lb… Short side lc… Rectangular four corners 2… Rotary cutter 2 A, 2B… Rotary cutter 3 ·· Clamping mechanism 3a… Long side 3b … Short side 26

Claims (1)

200412274 Scope of patent application: 1. A cutting method for laminated sheets, which is a finisher who cuts the cut surface of a rectangular laminated sheet. The cutting method includes: In the state of overlapping, the steps of clamping the laminated sheet of the plurality of sheets from the upper and lower sides by the clamping 5 mechanism; and the step of cutting the cut surface of the laminated sheet by the cutting mechanism in the state of clamping the laminated sheet of the majority, The total clamping area of the upper and lower sides of the clamping mechanism is 5 to 40% of the double area of the rectangular area of the laminated sheet, and the four corners of the rectangular shape are included in the clamping collar 10 field to form the foregoing. At least one of a pair of long sides or a pair of short sides of a rectangle is provided with a non-clamping region which is not clamped by the clamping mechanism. 2. For the lamination process of laminated sheet according to item 1 of the scope of patent application, the clamping area on the lower side is set to be larger than the clamping area on the upper side. 15 3. The method for cutting laminated sheets according to item 1 of the patent application scope, wherein the clamping mechanism located in the aforementioned clamping area is made of a soft material. 4. A multi-layer sheet is made by cutting the multi-layer sheet using the cutting method of patent application No. 1. 5. The laminated sheet according to item 4 of the patent application scope, wherein the laminated sheet is made of 20 materials for optical films. 6. —An optical element, which is provided on one or both sides of the optical element with the material for the optical film of item 5 of the patent application scope. 7. An image display device, which is equipped with a material for an optical film according to item 5 of the patent application. 27 200412274 8. —A kind of image display device, which is equipped with the optical element in the 6th scope of the patent application. 28