JP5712511B2 - Optical sheet, optical sheet roll, optical sheet manufacturing method, and video display device - Google Patents

Description

  The present invention relates to an optical sheet, an optical sheet roll, an optical sheet manufacturing method, and an image display device.

  An image display device that emits an image to an observer includes an image source and an optical sheet that includes layers having various functions for improving the quality of image light from the image source and emitting the image light to the observer. ing.

  For example, in a plasma display panel, when the observer side is bright, the contrast is insufficient and the image quality is degraded. Therefore, as a layer for improving the contrast, an optical functional sheet layer that includes a light transmitting portion that can transmit light and a light absorbing portion that can absorb light and appropriately shields outside light may be provided. . In addition, the liquid crystal panel may be provided with an optical functional sheet layer having a light transmission part capable of transmitting light and a light absorption part capable of absorbing light for the purpose of expanding the viewing angle.

  The optical functional sheet layer is formed on the base material layer as disclosed in Patent Document 1. A pressure-sensitive adhesive layer is formed on the side of the base material layer on which the optical functional sheet layer is not provided, and can be laminated with other layers. Patent Document 2 discloses a technique relating to how to provide such an adhesive layer.

JP 2009-80153 A Japanese Patent No. 4208187

  As described above, the optical function sheet layer is formed on the base material layer. In order to form the optical function sheet layer on the base material layer, first, a light transmission part is formed on the base material layer, and then a light absorption part is formed between the light transmission parts. When forming the light absorbing portion, the material constituting the light absorbing portion is supplied onto the light transmitting portion, and the material is scraped off while supplying the material to the groove between the light transmitting portions with a doctor blade or the like. A process is included. In the optical functional sheet layer having the conventional configuration, when the light absorbing portion is formed as described above, the material supplied on the light transmitting portion is difficult to spread uniformly in the width direction, and the material is a base material. There were problems such as running down from the edge of the layer.

  Then, this invention makes it a subject to provide the optical sheet of the structure which can form a light absorption part, supplying the material which comprises a light absorption part by a fixed quantity. Another object of the present invention is to provide an optical sheet roll obtained by winding the optical sheet into a roll, a method for manufacturing the optical sheet, and an image display device including the optical sheet.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

The invention according to claim 1 is an optical sheet (10) having a plurality of layers, which controls light incident from one surface side and emits the light to the other surface side, and comprises a base material layer (11) and the optical functional sheet layer formed on one surface of the base material layer (12), pressure-sensitive adhesive layer disposed on the side opposite to the side where the optical functional sheet layer is provided in the base layer (21) A protective film layer (20) disposed on the side opposite to the side on which the base material layer of the optical function sheet layer is provided, and the optical function sheet layer extends in the longitudinal direction of the optical sheet and extends in the longitudinal direction. A plurality of light transmission parts (13) capable of transmitting light arranged at predetermined intervals in a direction orthogonal to each other, and a light absorption part formed to absorb light in a groove between adjacent light transmission parts (14) and a, in a cross section perpendicular to the longitudinal direction of the optical science sheet, the light absorbing portion forms at both ends in the width direction Is a groove (14 ') between the light transmitting portion is not, the width direction of the end of the pressure-sensitive adhesive layer in a cross section perpendicular to the longitudinal direction of the optical sheet, there than the width direction of the end of the base layer on the inside, In the cross section orthogonal to the longitudinal direction of the optical sheet, the end in the width direction of the protective film layer is the same as or inward of the end in the width direction of the portion where the light absorbing portion is formed. Solve.

In the present invention, the “longitudinal direction of the optical sheet” means a direction that is the same as the flow direction of the production line when the optical sheet is produced. The “width direction” means a direction orthogonal to the longitudinal direction on the sheet surface. Furthermore, “in the cross section perpendicular to the longitudinal direction of the optical sheet, it has a groove between the light transmitting portions where the light absorbing portions are not formed on both ends in the width direction” means between the light transmitting portions of the optical functional sheet layer. This means that there is a portion where no light absorbing portion is formed. The optical function sheet layer also includes a portion where the light absorbing portion is not formed in the groove between the light transmitting portions.
In the present invention, “inner side from the end in the width direction” means a line that is in contact with one end in the width direction and perpendicular to the sheet surface of the optical sheet in the cross section orthogonal to the longitudinal direction of the optical sheet, and the other in the width direction. It means between the line that touches the end and is perpendicular to the sheet surface of the optical sheet.
In the present invention, the “part where the light absorption part is formed” means a part between the light absorption parts located at the extreme ends in the width direction among the plurality of light absorption parts formed. Further, “the end in the width direction of the protective film layer is the same as the end in the width direction of the portion where the light absorbing portion is formed” means that in the cross section orthogonal to the longitudinal direction of the optical sheet, Means that the line that is in contact with the edge in the width direction and perpendicular to the sheet surface of the optical sheet overlaps the line that is in contact with the edge in the width direction of the portion where the light absorbing portion is formed and is perpendicular to the sheet surface of the optical sheet To do.

As described in detail thus after aspects of the adhesive layer, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, such as during processing or during transportation of the optical sheet can be prevented from protruding from the end portion of the optical sheet.
Moreover, useless use of a protective film can be reduced by the aspect of the said protective film so that it may explain in full detail later.

In the invention according to claim 2 , in the optical sheet (10) according to claim 1 , in the cross section orthogonal to the longitudinal direction of the optical sheet, the end in the width direction of the optical function sheet layer (12) is an adhesive. It is characterized in that it is inside the edge in the width direction of the layer. With this configuration, as described in detail later, when forming the optical function sheet layer (light transmission portion), the substrate layer is prevented from being twisted or wrinkled, and the twist or wrinkle causes nip rolls. And the mold roll can be prevented from being damaged.

According to a third aspect of the invention, to solve the above problems by the optical sheet roll formed by winding the optical sheet (10) according to a roll to claim 1 or 2. By winding an optical sheet in a roll shape to obtain an optical sheet roll, it becomes easy to laminate with other layers or cut out to an appropriate size when the optical sheet is used.

The invention according to claim 4 includes an optical function sheet layer (12) having a light transmission part (13) formed so as to be able to transmit light and a light absorption part (14) formed so as to be capable of absorbing light. A method for producing an optical sheet comprising a plurality of layers, comprising: a light transmitting material in parallel at a predetermined interval along a sheet surface in a direction perpendicular to the longitudinal direction of the optical sheet on one surface of a base material layer. The width direction end in the cross section orthogonal to the longitudinal direction of the optical sheet on the surface of the base material layer opposite to the surface on which the light transmission portion is formed. In the cross section perpendicular to the longitudinal direction of the optical sheet, the adhesive layer forming step of forming the adhesive layer so as to be inside the width direction end of the material layer, and the groove between the light transmission parts, both end sides in the width direction The light absorbing portion is formed so as to leave a groove between the light transmitting portions where the light absorbing portion is not formed in the groove. In the cross section orthogonal to the longitudinal direction of the optical sheet, on the side opposite to the side where the base layer of the optical function sheet layer is provided, the light absorption part is formed at the end in the width direction. The said subject is solved by the manufacturing method of an optical sheet provided with the protective film layer formation process which forms a protective film layer so that it may become the same or inner side with respect to the edge of the width direction of a part .

By the pressure-sensitive adhesive layer forming step , an optical sheet capable of preventing the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer from protruding from the end of the optical sheet at the time of processing or transportation can be obtained.

Invention of Claim 5 is a manufacturing method of the optical sheet (10) of Claim 4 , WHEREIN: The light transmission part formation process WHEREIN: In the cross section orthogonal to the longitudinal direction of an optical sheet, it is an adhesive layer (21). It is a process of forming the light transmission part (13) inside the edge in the width direction. By adopting such a form, when forming the light transmission part, an optical sheet that prevents the substrate layer from being twisted or wrinkled and preventing the nip roll or the mold roll from being damaged by the twist or wrinkle is obtained. It is done.

  According to the present invention, it is possible to provide an optical sheet having a configuration capable of forming a light absorbing portion while supplying a constant amount of a material constituting the light absorbing portion by limiting a portion where the light absorbing portion is formed. it can. In addition, an optical sheet roll formed by winding the optical sheet into a roll, a method for manufacturing the optical sheet, and an image display device including the optical sheet can be provided.

It is the figure which showed roughly the cross section of the edge part of the optical sheet of this invention concerning one embodiment. It is the figure which expanded and showed a part of optical function sheet | seat layer shown in FIG. It is a figure explaining an example of the formation method of a light transmissive part. It is a figure explaining the other example of the formation method of a light transmissive part. It is the figure which showed the other example of the light absorption part.

  The above-described operation and gain of the present invention will be clarified from embodiments for carrying out the invention described below. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to these embodiments.

<Optical sheet>
FIG. 1 is a diagram schematically showing the layer configuration of an optical sheet 10 according to an embodiment, showing a cross section of an end portion thereof. In FIG. 1, the back / front direction of the drawing is the longitudinal direction of the optical sheet 10. FIG. 1 shows the optical sheet 10 by focusing on one end in the width direction, but the optical sheet 10 has the same shape at the other end in the width direction.

  The optical sheet 10 is a sheet-like member that transmits and emits light incident on the image source side as image light appropriate for an observer. The optical sheet 10 includes a base material layer 11, an optical function sheet layer 12, a protective film layer 20, an adhesive layer 21, and a release sheet layer 22. Each layer will be described below.

(Base material layer 11)
The base material layer 11 is a layer as a base material layer for forming the optical function sheet layer 12 to be described in detail later, and can contain polyethylene terephthalate (PET) as a main component. When the base material layer 11 has PET as a main component, other resin may be contained. Various additives may be added as appropriate. Examples of general additives include phenol-based antioxidants, lactone-based stabilizers, and the like. Here, “main component” means that the PET is contained in an amount of 50% by mass or more with respect to the entire material forming the base material layer (hereinafter the same).

The main component of the base material layer 11 is not necessarily PET, and may be other materials. Examples thereof include polybutylene terephthalate, polyethylene naphthalate, terephthalic acid-isophthalic acid-ethylene glycol copolymer, polyester resins such as terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer, and polyamide resins such as nylon 6. , Polyolefin resins such as polypropylene and polymethylpentene, acrylic resins such as polymethyl methacrylate, styrene resins such as polystyrene and styrene-acrylonitrile copolymer, cellulose resins such as triacetyl cellulose, imide resins and polycarbonate resins Etc. Moreover, you may add additives, such as a ultraviolet absorber, a filler, a plasticizer, an antistatic agent, in these resins suitably as needed.
In the present embodiment, the resin having PET as a main component has been described as a preferable material from the viewpoint of mass productivity, price, availability, etc. in addition to performance.

(Optical function sheet layer 12)
The optical function sheet layer 12 is a layer having a function of appropriately absorbing stray light and external light while controlling the optical path of the image light from the image light source side. The optical function sheet layer 12 has a shape having the cross section shown in FIG. 1 and extending to the back / near side of the drawing. That is, the light transmitting portions 13, 13,... Having a substantially trapezoidal cross section in the cross section shown in FIG. 1 and the light absorbing portions 14, 14,... Disposed between the light transmitting portions 13, 13,. ing. FIG. 2 shows an enlarged view of one light absorbing portion 14 of the optical functional sheet layer 12 and the light transmitting portions 13 and 13 adjacent thereto in the optical sheet 10 shown in FIG. The optical functional sheet layer 12 will be further described with reference to FIGS.

  The light transmission portions 13, 13,... Are portions that function as light transmission portions, and a short upper base and a long lower bottom in a substantially trapezoidal cross section are arranged in a direction along the sheet surface of the optical sheet 10. And the long lower bottom in a substantially trapezoidal cross section is the direction which faces the base material layer 11 side. Further, the light transmitting portions 13, 13,... Have a refractive index of Np and have light transmittance. Such a light transmission part 13,13, ... can be comprised by hardening the light transmission part structure composition demonstrated below. The value of the refractive index Np is not particularly limited, but is preferably 1.49 to 1.56 from the viewpoint of the availability of the applied material.

  The light transmissive part constituent composition contains a photocurable resin and a photopolymerization initiator. As such a light transmission part constituent composition, for example, a photocurable resin composition in which a photocurable prepolymer (P1), a reactive dilution monomer (M1) and a photopolymerization initiator (S1) are blended is preferably used. It is done.

  Examples of the photocurable prepolymer (P1) include epoxy acrylate-based, urethane acrylate-based, polyether acrylate-based, polyester acrylate-based, and polythiol-based prepolymers.

  Examples of the reactive dilution monomer (M1) include vinyl pyrrolidone, 2-ethylhexyl acrylate, β-hydroxy acrylate, and tetrahydrofurfuryl acrylate.

  Examples of the photopolymerization initiator (S1) include hydroxybenzoyl compounds (2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, benzoin alkyl ether, etc.), benzoyl Formate compounds (such as methylbenzoylformate), thioxanthone compounds (such as isopropylthioxanthone), benzophenones (such as benzophenone), phosphate compounds (1,3,5-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-) Trimethylbenzoyl) -phenylphosphine oxide and the like, and benzyldimethyl ketal and the like. Of these, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, and bis (2,4) are preferable from the viewpoint of preventing coloring of the light transmitting portions 13, 13,. , 6-trimethylbenzoyl) -phenylphosphine oxide.

  In addition, it is preferable that the said photoinitiator (S1) is contained 0.5 mass% or more and 5.0 mass% or less on the basis (100 mass%) of light transmission part structure composition whole quantity.

  In addition, in the light transmitting part constituting composition, if necessary, silicone additives, rheology control agents, It is also possible to add a defoaming agent, a release agent, an antistatic agent, an ultraviolet absorber and the like.

  The light transmission parts 13, 13,... Are formed as described below using the light transmission part constituting composition. First, a mold roll capable of forming a groove having a predetermined opening width and a predetermined depth at a predetermined pitch is prepared. A sheet serving as the base material layer 11 is fed between the mold roll and the nip roll, and the light transmitting portion constituting composition is supplied from the supply device between the mold roll and the base material layer 11 in accordance with the feeding of the sheet. . Thereafter, the light transmitting portion constituting composition is pressed with a mold roll and a nip roll so that the light transmitting portion constituting composition supplied onto the base material layer 11 is filled in the groove of the mold roll. At this time, by supplying the light transmitting portion constituting composition on the base material layer 11 so as to be thicker than the depth of the groove of the mold roll, the portions that will later become the light transmitting portions 13, 13,... Is done. That is, as shown in FIG. 1, a light transmitting portion configuration is provided under the groove (the portion corresponding to the convex portion between the grooves of the mold roll) to be the light absorbing portions 14, 14,. A communicating portion 13z having a predetermined thickness is formed by the composition, and the light transmitting portions 13 and 13 communicate with each other through the communicating portion 13z. After filling the light transmitting portion constituting composition between the base material layer 11 and the mold roll as described above, the light transmitting portions 13, 13 are cured by irradiating light to cure the light transmitting portion constituting composition. , ... can be formed.

  The light transmitting portions 13, 13,... May be formed parallel to the longitudinal direction of the base material layer 11, or may be formed with a predetermined angle with respect to the longitudinal direction of the base material layer 11. good. FIG. 3 shows a case where the light transmitting portions 13x, 13x,... Are formed in parallel to the longitudinal direction of the base material layer 11. FIG. 4 shows a case where the light transmitting portions 13y, 13y,... Are formed with a predetermined angle θ with respect to the longitudinal direction of the base material layer 11. A method for forming the light transmitting portions 13, 13,... Will be described with reference to FIGS.

  First, the case where the light transmission parts 13x, 13x,... Are formed in parallel to the longitudinal direction of the base material layer 11 will be described with reference to FIG. In the mold roll 50 shown in FIG. 3, concave portions 51, 51,... Having the same shape as the light transmitting portions 13x, 13x,. When the light transmissive portions 13x, 13x,... Are formed using the mold roll 50, the light transmissive portions 13x, 13x,... Are configured between the mold roll 50 and the base material layer 11 supplied in the direction of the arrow III. While supplying the resin to be rotated, the mold roll 50 is rotated on the base material layer 11 to cure the resin. By doing so, the recessed part currently formed on the base material layer 11 between the light transmissive parts 13x, 13x,... And the recessed parts 51, 51,. A belt-like sheet having grooves 14x, 14x,... Corresponding to the shapes of 52, 52,. At this time, since the concave portions 51, 51,... And the convex portions 52, 52,... Are formed on the outer peripheral surface in parallel to the circumferential direction of the mold roll 50, the light transmitting portions 13x, 13x,. The grooves 14x, 14x,... Are formed in parallel to the longitudinal direction of the base material 11.

  Next, the case where the light transmission parts 13y, 13y,... Are formed with a predetermined angle θ with respect to the longitudinal direction of the base material layer 11 will be described with reference to FIG. 4 has concave portions 61, 61,... Having the same shape as the light transmitting portions 13y, 13y,... To be formed and inclined on the outer circumferential surface with a predetermined angle .theta. ing. When the light transmissive portions 13y, 13y,... Are formed using the mold roll 60, the light transmissive portions 13y, 13y,... Are configured between the mold roll 60 and the base material layer 11 supplied in the direction of the arrow IV. While the resin to be supplied is supplied, the mold roll 60 is rotated on the base material layer 11 to cure the resin. By doing so, the concave portions formed on the base material layer 11 between the light transmitting portions 13y, 13y,... And the concave portions 61, 61,. A belt-like sheet having grooves 14y, 14y,... Corresponding to the shapes of 62, 62,. At this time, the concave portions 61, 61,... And the convex portions 62, 62,... Are inclined with a predetermined angle θ with respect to the circumferential direction of the mold roll 60 and are formed on the outer peripheral surface. .. And the grooves 14y, 14y,... Are inclined with a predetermined angle θ with respect to the longitudinal direction of the substrate 11.

  When forming the light transmitting portions 13, 13,... As described above, in the cross section orthogonal to the longitudinal direction of the optical sheet 10, the end in the width direction of the portion where the light transmitting portions 13, 13,. It is preferable that it exists inside the edge of the width direction of the adhesive layer 21 explained in full detail behind. That is, it is preferable that the distance D3 shown in FIG. 1 has a predetermined length. The length of D3 is not particularly limited, but is preferably 5 mm or more and 500 mm or less, and more preferably 5 mm or more and 100 mm or less.

  When the end in the width direction of the portion where the light transmitting portions 13, 13,... Are located outside the end in the width direction of the pressure-sensitive adhesive layer 21, the light transmitting portion constituting composition is pressed by contact between the mold roll and the nip roll. The base layer 11 is twisted or wrinkled in the base layer 11 due to the level difference caused by the thickness of the light transmitting portion constituting composition that becomes the light transmitting portions 13, 13,. Become. Moreover, when it presses in the state which the twist (wrinkle) generate | occur | produced, the wrinkle mixing part will be pressed strongly locally, and the problem that a nip roll will be dented or a crack | roll will generate | occur | produce will arise. By forming the light transmitting portions 13, 13,... So that the end in the width direction of the portion where the light transmitting portions 13, 13,. The agent layer 21 functions as a buffer material, and prevents the substrate layer 11 from being twisted or wrinkled, and can prevent the nip roll and the mold roll from being damaged.

  Next, the light absorbers 14, 14,... Will be described. The light absorbing portions 14, 14,... Are elements that are disposed between the light transmitting portions 13, 13,... And have a substantially triangular cross section in the cross sections shown in FIGS. A surface corresponding to the base of the triangular cross section is arranged between the upper bases of the light transmitting portions 13, 13,. .., And one surface of the optical function sheet layer 12 is formed by the bottoms of the light absorbing parts 14, 14... And the upper bases of the light transmitting parts 13, 13. Here, the hypotenuse in the triangular cross section at this time preferably forms an angle of 0 degrees or more and 10 degrees or less with respect to the normal direction of the sheet surface of the optical function sheet layer 12. When the angle of the hypotenuse is close to 0 degrees, it is not a substantial triangle but a rectangle.

  The cross-sectional shape of the light absorbing portion is not limited to a triangle. Further, the slope of the oblique side of the light absorbing portion is not necessarily constant, and may be a polygonal line or a curved line. FIG. 5 shows a cross section of the light absorbing portions 14a, 14b, and 14c among the optical function sheet layers 12a, 12b, and 12c, which are modifications of the optical function sheet layer. 5A is an example in which the cross-sectional shape of the light absorbing portion is substantially trapezoidal, FIG. 5B is an example in which the oblique side of the light absorbing portion is a polygonal line, and FIG. 5C is a curve in which the oblique side of the light absorbing portion is curved. This is an example.

  In the case shown in FIG. 5A, the cross-sectional shape of the light absorbing portion 14a is substantially trapezoidal. Specifically, it is a substantially isosceles trapezoid having an upper base and a lower base in which the cross-sectional shape of the light absorbing portion 14a is parallel, and two oblique sides connecting the upper base and the lower base. The hypotenuse forms an angle θ1 with respect to the normal line of the light exit surface of the optical sheet 10. θ1 is preferably in the range of greater than 0 degrees and less than 10 degrees. A more preferable angle is greater than 0 degree and 6 degrees or less.

In the case shown in FIG. 5B, the hypotenuse of the light absorbing portion 14b (the hypotenuse of the light transmitting portions 13b and 13b) is composed of two sides instead of one side. That is, the cross section has a polygonal oblique side. Specifically, the hypotenuse on the bottom side forms an angle θ2 with respect to the normal direction of the sheet surface of the optical function sheet layer 12b. On the other hand, the apex side (the oblique side arranged on the base material layer 11 side forms an angle θ3 with respect to the normal direction of the sheet surface of the optical function sheet layer 12b. This angle has a relationship of θ2> θ3. , Both are preferably in the range of 0 degree or more and 10 degrees or less, and more preferably the angle is larger than 0 degree and 6 degrees or less, and the two hypotenuses are as shown in FIG. The optical functional sheet layer 12b has a thickness direction T1 and T2 in the thickness direction (up and down direction in the drawing), and T1 and T2 are preferably the same size.
Further, the example of FIG. 5B is an example constituted by two oblique sides, but a polygonal line shape may be constituted by more sides.

  In the case shown in FIG. 5C, the inclined surface of the light absorbing portion 14c (the oblique sides of the light transmitting portions 13c, 13c,...) Is formed in a curved shape. As described above, the hypotenuse having a substantially triangular cross-sectional shape in the light absorbing portion may be curved. Even in this case, the angle formed between the curve and the normal direction of the sheet surface of the optical function sheet layer 12b is preferably smaller on the base material layer 11 side than on the bottom side of the light absorbing portion. Furthermore, the angle is preferably in the range of more than 0 degree and not more than 10 degrees at any part. A more preferable angle is greater than 0 degree and 6 degrees or less. Here, the angle formed between the curved portion and the normal direction of the sheet surface of the optical function sheet layer 12b divides the curve into 10 equal parts, and the line connecting the ends and the sheet surface of the optical function sheet layer 12b. It is defined by the angle formed by the normal direction.

  In addition, the shape of the light absorbing portion is not limited to that of the present embodiment, and can be appropriately changed as long as it can absorb external light appropriately.

Further, the light absorbing portions 14, 14,... Are made of a predetermined material having a refractive index Nb that is the same as or smaller than the refractive index Np of the light transmitting portions 13, 13,. In this way, by setting the refractive index Np of the light transmitting portions 13, 13... And the refractive index Nb of the light absorbing portions 14, 14,... To Np ≧ Nb, the light transmitting portions 13, 13,. The image light from the incident light source can be appropriately reflected and absorbed at the interface between the light absorbing portions 14, 14,... And the light transmitting portions 13, 13,. The difference in refractive index between Np and Nb is not particularly limited, but is preferably 0 or more and 0.06 or less.
Further, in the present embodiment, the relationship of Np ≧ Nb is preferable as described above. However, the present invention is not necessarily limited to this, and the refractive index of the light transmission part can be made smaller than the refractive index of the light absorption part. It is.

In addition, the light absorbing portions 14, 14,... In the present embodiment are filled with a light absorbing portion constituent composition including the light absorbing particles 16, 16,. It is constituted by. That is, the light absorbing particles 16, 16,... Are dispersed in the binder (binder portion) 15. Thus, in the light absorbing portions 14, 14,..., The light transmitting portions 13, 13,... And the light absorbing portions 14, 14,. The incident image light can be absorbed by the light absorbing particles 16, 16,. Furthermore, it is possible to appropriately absorb external light from the observer side that is incident at a predetermined angle, and it is possible to improve contrast.
At this time, the binder of the binder part 15 is made of the material having the refractive index Nb. Although what is used as the said binder is not specifically limited, For example, the photocurable resin composition which mix | blended the photocurable prepolymer (P2), the reactive dilution monomer (M2), and the photoinitiator (S2) is used preferably. It is done.

  Examples of the photocurable prepolymer (P2) include urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, and butadiene (meth) acrylate.

  Examples of the reactive dilution monomer (M2) include monofunctional monomers such as N-vinyl pyrrolidone, N-vinyl caprolactone, vinyl imidazole, vinyl pyridine, styrene, and other vinyl monomers, lauryl (meth) acrylate, stearyl ( (Meth) acrylate, butoxyethyl (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, methoxydipropylene glycol (meth) acrylate, paracumylphenoxyethyl (meth) ) Acrylate, nonylphenoxy polyethylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, isobornyl (meth) a (Meth) acrylic acid ester monomers such as relate, cyclohexyl (meth) acrylate, benzyl methacrylate, N, N-dimethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylate, acryloylmorpholine, A (meth) acrylamide derivative is mentioned. Polyfunctional monomers include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polytetra Methylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, 3-methyl-1, 5-pentanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, dimethylol-tricyclodecane di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate Bisphenol A polypropoxydiol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, propoxylated trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) Acrylate, glyceryl tri (meth) acrylate, propoxylated glyceryl tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate triacrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate And dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.

  Examples of the photopolymerization initiator (S2) include 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-1,2-diphenylethane- Examples include 1-one, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide. Among these, the irradiation device for curing the photocurable resin composition and the curability of the photocurable resin composition can be arbitrarily selected. In the present invention, the amount of the photopolymerization initiator (S2) contained in the photocurable resin composition is based on the total amount of the photocurable resin composition from the viewpoint of curability and cost of the photocurable resin composition (100 mass). %) Is preferably included in an amount of 0.5% by mass or more and 10.0% by mass or less.

  These photocurable prepolymer (P2), reactive diluent monomer (M2) and photopolymerization initiator (S2) can be used alone or in combination of two or more.

  Specifically, a photopolymerizable component composed of urethane acrylate, epoxy acrylate, tripropylene glycol diacrylate and methoxytriethylene glycol acrylate (specifically, photocurable prepolymer and reactive dilution monomer), refractive index, viscosity, Alternatively, in consideration of the influence on the performance of the optical function sheet layer 12, etc., it can be arbitrarily blended and used.

  In addition, you may add a silicone, an antifoamer, a leveling agent, a solvent, etc. to a photocurable resin composition as an additive.

  The light absorbing particles 16, 16,... Are included in the light absorbing portion constituting composition, and act to absorb stray light and external light when the light absorbing portions 14, 14,.

  As the light-absorbing particles 16, 16,..., Light-absorbing colored particles such as carbon black are preferably used. However, the present invention is not limited to these, and a specific wavelength is selectively selected according to the characteristics of the image light. Absorbing colored particles may be used. Specific examples include organic fine particles colored with metal salts such as carbon black, graphite, and black iron oxide, dyes, pigments, colored glass beads, and the like. In particular, colored organic fine particles are preferably used from the viewpoint of cost, quality, availability, etc. More specifically, acrylic cross-linked fine particles containing carbon black and urethane cross-linked fine particles containing carbon black Etc. are preferably used. Such colored particles are usually contained in the above-mentioned photocurable resin composition in the range of 3% by mass to 30% by mass. Colored particles having an average particle size of 1.0 μm or more and 20 μm or less are used. When the colored particles having an average particle diameter of 1.0 μm or more are used, the colored particles are not scraped off by the doctor blade when forming the light absorbing portions 14, 14,. It can prevent remaining on the upper bottom part of a part.

  The means for absorbing light is not limited to the method using light absorbing particles as in this embodiment. Other examples include coloring the entire light absorbing portion with a pigment or dye.

  The light absorbing portions 14, 14,... Are formed as described below using the light absorbing portion constituting composition. First, the light absorbing portion constituting composition is supplied so that a bank is formed on the light transmitting portions 13, 13,... Formed as described above. Then, while filling the groove between the light transmitting parts 13, 13,... With the doctor blade, the excess light absorbing part composition is scraped off, and the light transmitting parts 13, 13,. The light absorbing portions 14, 14,... Can be formed by irradiating and curing the light absorbing portion constituting composition remaining in the grooves.

  In this way, when forming the light absorbing portions 14, 14,..., Light in which the light absorbing portion light absorbing portions 14, 14,... Are not formed on both ends in the width direction in the cross section orthogonal to the longitudinal direction of the optical sheet 10. The light absorbing portion constituting composition is supplied so as to leave the groove 14 'between the transmitting portions 13, 13,. That is, the light absorbing portions 14, 14,... Are formed so that the distance D2 shown in FIG. The length of D2 is not particularly limited, but is preferably 5 mm or more and 200 mm or less.

  As a specific example of the method of forming the light absorbing portions 14, 14,... By limiting the portions where the light absorbing portions 14, 14,... Are formed as described above, the light absorbing portions 14, 13,. A weir is provided so that the light absorbing part constituting composition does not spread in the width direction from a predetermined position, and the light absorbing part constituting composition is supplied, and in the state where the weir is provided, the light absorbing part constituting composition is supplied to the doctor. A method of scraping with a blade is conceivable.

  When the width | variety of the part to which a light absorption part structure composition is supplied is wider than the width | variety of the part in which the light transmission parts 13, 13, ... are formed, a part of light absorption part structure composition (light absorption part structure composition) The edge part of the product bank is in direct contact with the base material layer 11, so that the light absorbing part constituent composition is likely to spread in the width direction and leaks from the end of the base material layer 11. As described above, by supplying the light absorbing portion constituting composition onto the light transmitting portions 13, 13,... So that the light absorbing portion constituting composition does not spread in the width direction from a predetermined position, the light transmitting portion Since the light absorbing portion constituent composition is filled in the grooves between 13, 13,..., The light absorbing portion constituent composition does not spread rapidly, and is stabilized by supplying a constant amount of the light absorbing portion constituent composition. The light absorbing portions 14, 14,... Can be formed while forming the banks.

(Adhesive layer 21)
Next, returning to FIG. 1, the adhesive layer 21 will be described. The pressure-sensitive adhesive layer 21 is a layer in which a pressure-sensitive adhesive is disposed. As the pressure-sensitive adhesive, known ones can be used. As an adhesive which can be used for this invention, an acrylic adhesive can be mentioned, for example. However, the pressure-sensitive adhesive is not limited to this as long as necessary light transmittance, adhesiveness, and weather resistance can be obtained. The pressure-sensitive adhesive may include a UV absorber, a near infrared absorber, a neon ray absorber, a toning dye, and the like.

  The pressure-sensitive adhesive layer 21 is formed on one surface side of the base material layer 11 prior to the optical function sheet layer 12. The formation method of the adhesive layer 21 is not specifically limited, For example, it can form by apply | coating the said adhesive to the one surface side of the base material layer 11, and making it dry.

  If the end in the width direction of the pressure-sensitive adhesive layer 21 is the same as or outside the end in the width direction of the base material layer 11 in the cross section orthogonal to the longitudinal direction of the optical sheet 10, the optical sheet 10 is processed or transported. When the optical sheet 10 touches any object (for example, a guide roll or a packing member), the adhesive constituting the adhesive layer 21 protrudes from the end of the optical sheet 10 to contaminate the production line, There is a possibility that adhesive chipping (adhesion of the adhesive) may occur. Therefore, in the cross section orthogonal to the longitudinal direction of the optical sheet 10, the width direction end of the pressure-sensitive adhesive layer 21 is preferably inside the width direction end of the base material layer 11. That is, it is preferable that the distance D5 shown in FIG. 1 has a predetermined length. The length of D5 is not particularly limited, but is preferably 3 mm or more and 100 mm or less.

(Release film layer 22)
Next, the release film layer 22 will be described. The release film layer 22 is a layer provided to prevent foreign matter from adhering to the pressure-sensitive adhesive layer 21 when the optical sheet 10 is processed or transported, or to prevent the pressure-sensitive adhesive layer 21 from coming into contact with other things. It is. The release film layer 22 may be provided after the pressure-sensitive adhesive layer 21 is formed. After the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 21 is applied to one surface side of the base material layer 11, the pressure-sensitive adhesive is removed. It may be provided before drying. A known release film can be used as the release film constituting the release film layer 22.

  From the viewpoint of achieving the purpose of providing the release film layer 22 described above, the release film layer 22 is preferably provided in a size that can cover the pressure-sensitive adhesive layer 21. That is, the distance D4 shown in FIG. 1 is preferably 0 mm or more, and more preferably 3 mm or more and 100 mm or less. However, the end in the width direction of the release film layer 22 is preferably inside the end in the width direction of the base material layer 11. That is, the distance D6 shown in FIG. 1 is preferably 0 mm or more. After the optical sheet 10 is manufactured, when the optical sheet 10 is cut into an appropriate size, it is necessary to accurately recognize the position of the end of the optical sheet 10 in the width direction on the conveyance line. At this time, the end in the width direction of the base material layer 11 is the end in the width direction of the optical sheet 10 (the width of the base material layer 11 is wider than the other layers). It becomes easy to recognize the position of the end of the direction stably. Since a release film layer 22 is usually a thin film, the release film layer 22 has an end in the width direction outside the end in the width direction of the base material layer 11. It becomes difficult to stably recognize the position of the end in the width direction of the optical sheet 10 by bending the end of 22 or the like. Therefore, D6 is preferably 0 mm or more.

(Protective film layer 20)
Next, the protective film layer 20 will be described. The protective film layer 20 is a layer provided to prevent the optical functional sheet layer 12 from being damaged when the optical sheet 10 is processed or transported. As the film constituting the protective film layer 20, a known release film can be used.

  In the cross section orthogonal to the longitudinal direction of the optical sheet 10, the end in the width direction of the protective film layer 20 is the same as or inward of the end in the width direction of the portion where the light absorbing portions 14, 14,. Preferably there is. This is because the protective film layer 20 only needs to protect the surface of the optical functional sheet layer 12 that is to be incorporated into a final product such as a video display device. If the protective film layer 20 covers a portion that is cut off when a sheet of an appropriate size is cut out from the optical sheet 10, the protective film is wasted. The distance D1 shown in FIG. 1 is preferably 0 mm or more, and more preferably 3 mm or more and 100 mm or less.

(Other layers)
In the description of the present invention so far, the optical sheet 10 including the base material layer 11, the optical function sheet layer 12, the protective film layer 20, the adhesive layer 21, and the release film layer 22 has been described. The optical sheet only needs to have the above-described base material layer and the optical functional sheet layer formed on the base material layer, and also includes layers having various functions other than the layers described so far depending on the application. Can be made. As other layers that can be provided in the optical sheet of the present invention, those used in conventional optical sheets can be used without any particular limitation. Specifically, an electromagnetic wave shielding layer, an antiglare layer, an antireflection layer, a hard coat layer, a wavelength filter layer, and the like can be configured by bonding using an adhesive layer. In addition, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer may include a UV absorber, a near-infrared absorber, a neon line absorber, a toning pigment, and the like. The order of lamination of these layers and the number of laminations are appropriately determined according to the use of the optical sheet. Hereinafter, functions of these layers will be described.

  As the name indicates, the electromagnetic wave shielding layer is a layer having a function of blocking electromagnetic waves. As long as the layer has the function, a means for blocking electromagnetic waves is not particularly limited. Examples thereof include those formed by, for example, an etching method, a printing method, a vapor deposition method, and a sputtering method, and are appropriately designed according to electromagnetic waves to be blocked.

  The antiglare layer is a layer having a function of suppressing so-called glare and is sometimes called an antiglare layer or an AG layer. A commercially available layer can be used as such an antiglare layer.

  The antireflection layer is a layer that is disposed closest to the viewer and has a function of preventing reflection of external light. According to this, it can suppress that external light reflects on the observer side surface of an optical sheet, returns to the observer side, and what is called reflection arises and it becomes difficult to see an image | video. Such an antireflection layer can be constituted by using a commercially available antireflection film.

  The hard coat layer may be referred to as an HC layer. This is a layer in which a film having a function capable of imparting scratch resistance is provided in order to prevent the image display surface from being scratched.

  The wavelength filter layer is a layer having a function of suppressing transmission of light having a predetermined wavelength. The wavelength whose transmission should be suppressed can be appropriately selected as necessary. Specific examples of the wavelength filter layer include a layer that absorbs neon rays, an infrared ray, a near infrared ray, and an ultraviolet ray, a color tone, and the like. The layer which adjusts can be mentioned.

<Optical sheet roll>
Next, the optical sheet roll of the present invention will be described. The optical sheet roll of the present invention is obtained by winding the optical sheet of the present invention in a roll shape so that the longitudinal direction is the winding direction. In addition, when winding an optical sheet, you may wind so that either an optical function sheet layer or a base material layer may become an outer side. However, it is preferable to wind with the light transmission part (optical function sheet layer) outside. Since it is wound in a direction in which curing shrinkage of the light transmitting portion is suppressed, curling of the optical sheet is suppressed when the optical sheet is cut out from the optical sheet roll and laminated with another sheet (layer). It is.

  According to the optical sheet roll of the present invention, when the optical sheet is used, it becomes easy to laminate with other layers or to cut out to an appropriate size. Therefore, the waste of the optical sheet can be omitted and the cost can be reduced.

<Video display device>
The video display device of the present invention includes a sheet obtained by cutting the optical sheet of the present invention into an appropriate size and a video source. For example, a plasma display can be obtained by using a PDP as an image source and stacking the optical sheet of the present invention cut to an appropriate size on the PDP.

  When the optical sheet of the present invention is cut into an appropriate size, the optical sheet is cut according to the size of the image source, and the end portions are cut out to make the widths of the respective layers included in the optical sheet uniform. The protective film layer is a layer provided to prevent the optical functional sheet layer from being damaged during processing or transportation of the optical sheet, and the release film layer is used during processing or transportation of the optical sheet. Since it is a layer provided to prevent foreign matter from adhering to the pressure-sensitive adhesive layer at times, etc., and the pressure-sensitive adhesive layer from coming into contact with other things, when using an optical sheet for an image display device, these The layer has been removed.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the examples.

The optical sheets according to Example 1, Comparative Example 1, and Reference Examples 1 and 2 described below are manufactured. In these manufacturing processes, the trouble that the pressure-sensitive adhesive layer gives to the entire production line, the light transmission part forming process The defect and the presence or absence of the defect in the light absorption part formation process were evaluated. Regarding the optical sheets according to Example 1, Comparative Example 1, and Reference Examples 1 and 2, the width relationship of each layer constituting the optical sheet (relationship of the width of each layer), the presence or absence of defects that the adhesive layer gives to the entire production line Table 1 shows (production line overall), presence / absence of defects in the light transmission part formation process (light transmission part formation process), presence / absence of defects in the light absorption part formation process (light absorption part formation process), and comprehensive judgment. It was. Comprehensive judgments were “O” when there was no defect in any item, and “X” when there was a defect in any item. In the relationship between the widths of the layers, A is the width of the base material layer, B is the width of the pressure-sensitive adhesive layer, C is the width of the light transmission part forming part (width of the optical function sheet layer), and D is the light absorbing part. It means the width of the part that has been.
<Example 1>
(1) Adhesive layer forming step and release film layer forming step A (meth) acrylic resin adhesive (manufactured by Soken Chemical Co., Ltd., SK Dyne 2094) with respect to 100 parts by mass, a curing agent (manufactured by Soken Chemical Co., Ltd., E-5XM) 0.25 parts by mass and 30 parts by mass of solvent MIBK were added and sufficiently dispersed to prepare an adhesive composition. The pressure-sensitive adhesive composition was coated on a base material layer (PET film, thickness: 100 μm, width: 1400 mm) so that the thickness was 25 μm and the width direction was 1370 mm, and dried at 80 ° C. for 3 minutes. After drying, the obtained coating film is further coated with a release-treated PET film (release film, thickness: 38 μm, width 1380 mm) to form an adhesive layer and a release film layer on one side of the base material layer. did.

(2) Adjustment of composition for light transmission part 15 parts by mass of urethane acrylate composed of polytetramethylene glycol and isophorone diisocyanate, 55 parts by mass of urethane acrylate composed of bisphenol A-ethoxy adduct and xylylene diisocyanate, 20 parts by mass of phenoxyethyl acrylate Bis (2,4) as a photopolymerization initiator for a mixture of 4 parts by mass of dipentaerythritol hexaacrylate, 4 parts by mass of bisphenol A diglycidyl ether, and 2 parts by mass of a phosphoric ester of tetradecanol-ethoxy adduct. , 6-Trimethylbenzoyl) -phenylphosphine oxide 1 part by mass was added to homogenize.

(3) Light transmission part formation process The mold roll which can form a groove | channel whose pitch is 51 micrometers, opening width (refer width x shown in FIG. 2) is 10 micrometers, and depth is 69 micrometers was prepared. A base material layer having an adhesive layer formed on one side as described above was fed between the mold roll and the nip roll. In accordance with the feeding of the base material layer, the light transmission part constituting composition obtained above was supplied between the mold roll and the base material layer. At this time, on the base material layer, the light transmissive part constituent composition is supplied from the supply device so that the width of the bank of the light transmissive part constituent composition is 1330 mm, and the light transmissive part constituent composition is in the groove of the mold roll. The light transmitting part constituting composition was pressed with a mold roll and a nip roll so as to be filled. At that time, the protrusion of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer could not be confirmed between the base material layer and the release film layer. After that, the light transmitting part constituting composition was cured without any defects such as wrinkles by irradiating with 800 mJ / cm ² ultraviolet light from the base material layer side with a high pressure mercury lamp, and the light transmitting part could be formed. As a result, an optical functional sheet layer was obtained in which the thickness including the light transmission part was 189 ± 20 μm and the width of the light transmission part formation part was 1330 mm before the light absorption part was formed.

(4) Adjustment of light absorption part composition composition 28 parts by mass of tripropylene glycol diacrylate as a reactive dilution monomer in a prepolymer in which 33.6 parts by mass of urethane acrylate and 14.4 parts by mass of epoxy acrylate are mixed, and To the composition prepared by adding 4 parts by mass of methoxytriethylene glycol acrylate, 3 parts by mass of bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide as a photopolymerization initiator, and an average particle size of 4 as colored particles 16 parts by mass of 0.0 μm carbon black-containing acrylic crosslinked fine particles (manufactured by Ganz Kasei Co., Ltd.) were mixed and homogenized.

(5) Light absorption part formation process The light absorption part composition obtained above was supplied from the supply apparatus onto the light transmission part obtained above. At this time, the light absorbing portion constituting composition was supplied from the supply device so that the width of the bank of the light absorbing portion constituting composition was 1260 mm on the light transmitting portion. Next, while using a doctor blade, the light absorption part composition was supplied to the groove between the light transmission parts, and the excess light absorption part composition was scraped off. At this time, the light absorption part constituent composition did not leak from the end of the base material layer. Thereafter, the light absorbing portion constituting composition was cured by irradiating ultraviolet rays from the side opposite to the side on which the base material layer was provided, and the light absorbing portion was formed by the cured light absorbing portion constituting composition. The width of the portion where the light absorbing portion is formed was 1260 mm in width. As described above, an optical sheet provided with a base material layer, an optical functional sheet layer composed of a light transmission part and a light absorption part, an adhesive layer, and a release film layer was obtained.

<Comparative Example 1>
In the same manner as in Example 1, a pressure-sensitive adhesive layer, a release film layer, and a light transmission part were formed. Next, an attempt was made to form the light absorbing portion in the same manner as in Example 1 except that the width of the portion where the light absorbing portion was formed was 1350 mm. However, when scraping off the light absorbing portion constituting composition supplied onto the light transmitting member using a doctor blade, the bank at the end in the width direction is not stable, and the light absorbing portion constituting composition leaks out. It was impossible to manufacture an optical sheet.

<Reference Example 1>
An adhesive layer, a release film layer, and an optical function sheet layer were formed in the same manner as in Example 1 except that the width of the adhesive layer was 1400 mm. However, when forming the light transmission part, the pressure-sensitive adhesive layer is crushed by the pressing force between the mold roll and the nip roll, the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer protrudes from the end of the base material layer, the mold roll, The nip roll was contaminated with the pressure-sensitive adhesive composition, and an optical sheet could not be produced.

<Reference Example 2>
A pressure-sensitive adhesive layer and a release film layer were formed in the same manner as in Example 1 except that the width of the pressure-sensitive adhesive layer was 1300 mm. Next, an attempt was made to form a light transmissive portion on the base material layer in the same manner as in Example 1 except that the width of the light transmissive portion forming portion was 1330 mm. At that time, the protrusion of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer could not be confirmed between the base material layer and the release film layer. However, wrinkles were generated when the composition of the light transmission part was cured by irradiating with 800 mJ / cm ² of ultraviolet light from the base material layer side with a high-pressure mercury lamp. Moreover, when the light transmission part produced on these conditions was confirmed visually, it was impossible to produce an optical sheet on these conditions because a transfer trace due to a scratch on the mold could be confirmed.

  Although the invention has been described with reference to embodiments that are presently practical and preferred, the invention is not limited to the embodiments disclosed herein, but is claimed. The optical sheet, the optical sheet roll, the manufacturing method of the optical sheet, and the image display device can be changed as appropriate without departing from the scope or spirit of the invention that can be read from the entire specification and the specification. Should be understood as being included in the technical scope of

DESCRIPTION OF SYMBOLS 10 Optical sheet 11 Base material layer 12 Optical function sheet layer 13 Light transmission part 14 Light absorption part 15 Binder part 16 Light absorption particle 20 Protective film layer 21 Adhesive layer 22 Release film layer

Claims (5)

An optical sheet having a plurality of layers, which controls light incident from one surface side and emits the light to the other surface side,
A base material layer;
An optical functional sheet layer formed on one surface side of the base material layer;
A pressure-sensitive adhesive layer disposed on the side of the base material layer opposite to the side on which the optical function sheet layer is provided;
A protective film layer disposed on the side opposite to the side on which the base material layer of the optical function sheet layer is provided, and
The optical function sheet layer is
A plurality of light transmitting portions that can transmit light arranged in a direction perpendicular to the longitudinal direction and extending at a predetermined interval in the longitudinal direction of the optical sheet, and grooves between the adjacent light transmitting portions A light absorption part formed to absorb light,
In a cross section orthogonal to the longitudinal direction of the optical sheet, the light absorbing portion is not formed on both end sides in the width direction, and has a groove between the light transmitting portions,
In the cross section orthogonal to the longitudinal direction of the optical sheet, the end in the width direction of the pressure-sensitive adhesive layer is inside the end in the width direction of the base material layer,
The optical sheet in which the edge of the width direction of the said protective film layer is the same or inside with respect to the edge of the width direction of the part in which the said light absorption part is formed in the cross section orthogonal to the longitudinal direction of the said optical sheet.   2. The optical sheet according to claim 1, wherein an end in the width direction of the optical function sheet layer is on an inner side than an end in the width direction of the pressure-sensitive adhesive layer in a cross section orthogonal to the longitudinal direction of the optical sheet.   An optical sheet roll formed by winding the optical sheet according to claim 1 in a roll shape. A method for producing an optical sheet comprising a plurality of layers comprising an optical functional sheet layer having a light transmission part formed so as to be able to transmit light and a light absorption part formed so as to be capable of absorbing light,
On one surface of the base material layer, a light transmission part forming step of forming a light transmission part in parallel at a predetermined interval along the sheet surface in a direction orthogonal to the longitudinal direction of the optical sheet;
In the cross section orthogonal to the longitudinal direction of the optical sheet on the surface of the base material layer opposite to the surface on which the light transmission part is formed, the end in the width direction is the end in the width direction of the base material layer. A pressure-sensitive adhesive layer forming step for forming the pressure-sensitive adhesive layer so as to be on the inner side;
In the cross section perpendicular to the longitudinal direction of the optical sheet, in the groove between the light transmissive portions, the light between the light transmissive portions where the light absorbing portions are not formed is left in the grooves on both ends in the width direction. A light absorption part forming step of forming the absorption part;
In the cross section orthogonal to the longitudinal direction of the optical sheet on the side opposite to the side on which the base material layer is provided of the optical function sheet layer, the width direction end is the width of the portion where the light absorbing portion is formed And a protective film layer forming step of forming the protective film layer so as to be the same or inside with respect to the end of the direction.   5. The optical according to claim 4, wherein the light transmitting portion forming step is a step of forming the light transmitting portion inside a width direction end of the pressure-sensitive adhesive layer in a cross section orthogonal to the longitudinal direction of the optical sheet. Sheet manufacturing method.

Images