DE102011009281A1 - Adhesive film for photo-alignment layer orientation treatment, for optical filter used in dimensional image displaying device - Google Patents

Abstract

The adhesive film has a material (10) having an optical transmission area (B) and a light cut-off region (T) which is arranged adjacent to optical transmission area. The optical transmission area and the light cut-off region are provided with respective stripe geometry. A gap having width of unit pixel for left-eye of display unit is formed between adjacent light cut-off regions. Independent claims are included for the following: (1) optical filter; (2) manufacturing method of optical filter; and (3) dimensional image displaying device.

Description

Technical area

The present invention relates to a pressure-sensitive adhesive film for a photo-oriented layer orientation treatment, a laminated film, a process for producing an optical filter, or a stereoscopic image display.

Priority of Korean Patent Application No. 2010-0005907 , filed January 22, 2010, the contents of which are incorporated herein by reference.

State of the art

A stereoscopic image display is a display device that is capable of displaying images that convey a sense of depth. Conventional display devices present information only on its two-dimensional plane, i. H. their visual representation level, and there have therefore been fundamental limitations since information is lost in terms of the depth of the object to be displayed.

The stereoscopic image display can display an object in three dimensions, not only on a two-dimensional plane, but in space, and thus it can provide an observer with original three-dimensional information of objects to be displayed, and can present more realistic information.

Techniques for displaying a three-dimensional image can be classified into a glass type and a glass-free type. The glass type can also be classified into a polarizing glass type and an LC shutter glass type, and the glassless type can be classified into a stereoscopic / multi-view binocular disparity type, volumetric type, holographic type and the like become.

Technical problem

The present invention is intended to provide a pressure-sensitive adhesive film for a photo-oriented layer orientation treatment, a laminated film, a process for producing an optical filter or a stereoscopic image display.

Technical solution

The present invention relates to a pressure-sensitive adhesive film used for an orientation treatment in a photo-orientable layer, and comprises a substrate in which at least one light-transmissive portion and at least one light-blocking portion are formed.

The pressure-sensitive adhesive film will be described in detail below.

In one embodiment, the pressure-sensitive adhesive film may be used during a process for an orientation treatment in which a photo-orientable layer is irradiated with light and thereby orienting the photo-orientable layer. In one embodiment, the pressure-sensitive adhesive film for orientation treatment may be used to form a pattern including at least one first oriented region having a first orientation direction and at least one second oriented region having a second orientation direction different from the first orientation direction, or at least two Types of regions with orientation directions with different directions from each other in the photoorientierbaren layer includes. During the orientation treatment, the substrate in which at least one light transmitting portion and at least one light blocking portion are formed may act as a kind of mask. In particular, since the film is a pressure-sensitive adhesive film, the orientation treatment can be performed in a state where the film is attached to the photo-orientable layer, i. H. in a state where there is substantially no space between the substrate and the photo-orientable layer, and therefore it is possible to prevent non-oriented areas from being generated and to form an oriented pattern with high degrees of accuracy.

The term "photo-orientable layer" as used herein may include any type of orientable layers that are commonly used in the art and include the molecules that comprise along the predetermined direction can be oriented by irradiation with light. In one embodiment, the photo-orientable layer may be an orientable layer that can be oriented by irradiation with polarized ultraviolet rays, such as linearly polarized ultraviolet rays, and may then induce orientation of liquid crystal compounds that may be formed on the orientable layer Interactions with the liquid crystal compounds.

In an embodiment, the photo-orientable layer may be an orientable layer used in an optical filter for a stereoscopic image display. Examples of the stereoscopic image display optical filter may include a structured retarder for a stereoscopic image display.

The term "translucent portion" as used herein means the area of the substrate through which incident light can pass from the top or bottom of the substrate, and the term "light blocking portion" as used herein means the area of the substrate through which irradiated light from the top or bottom of the substrate can not pass.

1 Fig. 10 is a cross-sectional view showing an example of the substrate 10 shows, which is contained in the pressure-sensitive adhesive film. As in 1 shown closes the substrate 10 of the pressure-sensitive adhesive film, at least one transparent portion T, through which irradiated light can pass in the thickness direction, and at least one light-blocking portion B, which can shield or absorb the light. The light is in 1 indicated by arrows. One or two or more light transmitting portions and one or two or more light blocking portions may be formed in the substrate accordingly.

The shapes of the transmissive portion and the light blocking portion are not particularly limited, but may be formed according to the required oriented patterns of the photo-orientable layer.

In one embodiment, the transmissive portion and the light blocking portion may be in the form of stripes that extend in a common direction, and may be alternately arranged toward the short side of the shape of stripes. 2 Fig. 12 is a drawing showing an illustrative example of the substrate as viewed from the top thereof. In the substrate 10 from 2 For example, the transmissive portion T and the light blocking portion B are in the form of stripes extending in a common direction, and are alternately arranged toward the short side of the shape of stripes.

In the case where the transmissive portion T and the light-blocking portion B are in the form of stripes extending in a common direction and alternately arranged in the direction of the short side of the form of stripes, the pitch of the above portions, ie the sum of the width of the light-blocking portion and the distance to the adjacent light-blocking portion, and the distance between adjacent blocking portions are not particularly limited, but they can be adjusted according to the use of the photo-orientable layer. In 2 the pitch is designated P and the distance is designated as V.

For example, in the case where the photo-orientable layer is a photo-orientable layer used in a stereoscopic image display optical filter, the pitch of the translucent portion and the light-blocking portion may be twice as long as the width of a unit pixel forms an image for a right eye, or a unit pixel forming an image for a left eye. Conventionally, as shown in FIG 6 For example, a stereoscopic image display may include an element for displaying images, such as a display panel 62 and an optical filter 63 , such as a structured retarder. In the above, the element for displaying images may also be a unit pixel (a left eye unit pixel, UL) for forming a left eye image and a unit pixel (a right eye unit pixel, UR) for forming an image for a right Eye, both of which may be in the form of stripes extending in a common direction and arranged alternately in the direction of the short side of the form of stripes as in 3 , In the case where the photo-orientable layer to which the pressure-sensitive adhesive film is applied is used in the stereoscopic image display optical filter as described above, it is preferable that the pitch P has the same value as twice the width of the Unit pixels UR or UL in the element for displaying images. In 3 For example, the width of the unit pixel UR or UL is designated as W1 or W2.

The term "same value" as used herein includes substantially the same value within a range without losing the benefit of the invention, and includes some error caused by various factors, such as manufacturing defects and variations.

For example, the pitch having the same value as twice the width of the unit pixel includes errors within about ± 60 μm, errors within about ± 40 μm, or errors within about ± 20 μm.

In the present invention, the pitch of the substrate can be adjusted as described above, and therefore, it is possible to avoid that non-oriented portions are formed after the orientation treatment, and to form an oriented pattern with high degrees of accuracy. Therefore, in the case where the optical filter including the above orientable layer in which a stereoscopic image display is used, it is possible to prevent so-called crosstalk from being generated in the device.

In the above, it is also preferable that the distance (eg, V in 2 ) between the adjacent light blocking portions has the same value as the width (e.g., W1 or W2 in FIG 3 ) of the unit pixel UR or UL in the element for displaying images of the stereoscopic image display. As described above, the term "same value" as used herein means substantially the same value, and may include, for example, errors within about ± 30 μm, errors within about ± 20 μm, or errors within about ± 10 μm.

In the present invention, the distance can be set to be the same as the width of the unit pixel, and it is therefore possible to prevent non-oriented areas from being generated after the orientation treatment and to form an oriented pattern with high degrees of accuracy. Also, in the case where the optical filter including the above orientable layer in which a stereoscopic image display is used, it is possible that the corresponding polarization transforming parts correspond to the unit pixels with high degrees of accuracy, and it is therefore possible to prevent so-called cross coupling from being generated in the device.

In the substrate of the present invention, the shapes of the light transmitting portion and the light blocking portion are not limited to the above-described stripes, but may be changed according to the shapes of the element for displaying images or other applications to which the photo-orientable layer can be applied ,

In the case where the photo-orientable layer is a photo-orientable layer used in a stereoscopic image display optical filter as above, and the unit pixels forming in the left-eye image and a right-eye image in the element for displaying images in a cross-striped pattern, the translucent portion and the light-blocking portion may be formed in a cross-stripe pattern corresponding to the pattern of the unit pixels. In this case, the pitch and pitch of the transmissive and light-blocking portions can be set in the same manner as described above. For example, the pitch of the transmissive portion and the light-blocking portion may be substantially the same as twice the width of the unit pixel formed in the cross-stripe pattern, and also the distance between the adjacent light-blocking portions may be substantially the same as that Width of the unit pixel. In the above, the pitch and the pitch may be the longitudinal or transverse pitch, or the longitudinal or transverse pitch in the cross-striped pattern of the translucent portion and the light-blocking portion, and the width of the unit pixel may be the longitudinal or transverse width in the cross-stripe pattern of the unit pixels.

For example, in the present invention, the substrate may include a transparent sheet and light blocking or light absorbing inks forming the light blocking portions on the sheet.

That is, the substrate can be formed by forming the light-blocking portion by printing the light-blocking or light-absorbing ink on the light-transmissive sheet according to the required pattern.

In the above, the translucent film means a film through which an effective amount of light used to orient the photo-orientable layer, such as ultraviolet rays, can pass through, and the effective amount can mean such an amount that the photoorientierbare layer can be effectively oriented. The translucent film may, for example, be a film having a low light absorption rate, and may be a film having a light absorption rate of about 10% or less with respect to light having a wavelength of about 320 nm or less. The translucent film as described above may be, for example, a cellulose film such as a triacetyl cellulose film; or an olefin foil such as a foil made of norbornene derivatives, but the translucent foil usable herein is not limited thereto as long as it has an appropriate light transmittance property. The thickness of the film is not particularly limited herein, and it may be set in consideration of the required application, the transmittance rate, and the like.

The above-described film is also used as a substrate for a protective film which is used to prevent impurities from being generated in the orientable layer and to improve orientability during a process for producing an optical filter. In one embodiment, the light-blocking portion may be formed directly in the substrate of the protective film, and therefore, the film may become not only the protective film but also the pressure-sensitive adhesive film for the mask. Therefore, by using a simple method in which the orientable layer is irradiated with light before or after attachment of the film, it becomes possible to increase the productivity of the optical filter with high degrees of accuracy without additional equipment.

The types of the ink constituting the light-blocking portion in the film are not particularly limited, but any of the light-blocking or light-absorbing inks known in the art may be used. As the above inks, there may be exemplified inks containing inorganic pigments such as carbon black, graphite or oxidized steel; or organic pigments such as azo pigment or phthalocyanine pigment, and the inks described above can be used in the printing process after being mixed with suitable binders and / or solvents.

In the above, the printing methods for forming the light blocking portion are not particularly limited, but conventional printing methods such as screen printing or gravure printing or selective jet ink jet methods may be used, for example.

The printing height of the inks herein may be about 0.1 μm to 4 μm, preferably about 0.5 μm to 2.0 μm. However, the pressure level is not limited to this. For example, if the printing height is excessively low, the light-blocking property may be lowered, and if the printing height is excessively high, it may become difficult to use the film as a protective film, and therefore, the printing height can be adjusted in consideration of the above considerations.

The pressure-sensitive adhesive film may further include a pressure-sensitive adhesive layer formed on at least one side of the substrate, and the pressure-sensitive adhesive layer may be used to attach the substrate to the photo-orientable layer. In the above, the attachment may mean a state in which the distance between the substrate and the photo-orientable layer substantially does not exist. 4 FIG. 12 is a cross-sectional view of an illustrative example of the pressure-sensitive adhesive film, and as shown in FIG 4 , The pressure-sensitive adhesive film may be a substrate 10 in which at least one light transmissive portion T and at least one light blocking portion B are formed; and a pressure-sensitive adhesive layer 20 formed on one side of the substrate.

In the above, the materials and the thickness of the pressure-sensitive adhesive layer are not particularly limited, and they can be suitably selected in consideration of the conditions of the orientation treatment and the like. The pressure-sensitive adhesive layer may include, for example, translucent pressure-sensitive adhesives and may include, for example, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, a polyisobutylene pressure-sensitive adhesive, a rubber pressure-sensitive adhesive such as an SBR (styrene-butadiene rubber), a polyvinyl ether pressure-sensitive adhesive, a Include epoxy pressure-sensitive adhesive, a melamine pressure-sensitive adhesive, a polyester pressure-sensitive adhesive, a phenolic pressure-sensitive adhesive, or a silicone pressure-sensitive adhesive; or a hybrid pressure-sensitive adhesive including at least two of the above.

The present invention also relates to a laminated film used to prepare an optical filter comprising a base, a photo-orientable layer formed on the base, and the pressure-sensitive adhesive film fixed on the photo-orientable layer.

Types of the base used in the laminated film are not particularly limited, but any conventional base used in the optical filter may be used, for example. When the base may be a conventional glass base or plastic base. As the plastic base, there can be exemplified a plastic base prepared by using a TAC (triacetyl cellulose), a COP (cycloolefin copolymer), a pac (polyacrylate), a PES (polyethersulfone), a PC (polycarbonate), a PEEK (polyetheretherketone) , a PMMA (polymethylmethacrylate), a PEI (polyetherimide), a PEN (polyethylene naphthalate), a PET (polyethylene terephthalate), a PI (polyimide), a PSF (polysulfone), a PVA (polyvinyl alcohol), a PAR (polyarylate) and / or an amorphous fluororesin.

In one embodiment, in the case where the optical filter is a patterned retarder, a base having a (-) - c-plate property and having a R _e of about 10 nm or less, and preferably about 5 nm or less; an R _th of about 300 nm or less, preferably about 100 nm or less, more preferably about 60 nm or less, and even more preferably about 15 nm or less; and a refractive index of about 1.33 to 1.53.

In the above, a (-) - c plate property means a property satisfying the equation "N _x = N _y > N _z ", a R _e means a value calculated by "(N _x -N _y ) x d And an R _th means a value calculated by "{(N _x + N _y ) / 2 - N _z } x d". In the above, an N _{x means} a refractive index of the base along the slow axis direction in a plane, an N _y means a refractive index of the base along the fast axis direction in a plane, N _z means a refractive index of the base along the thick direction, d means one Thickness of the base.

By using the plastic base having optical anisotropy as described above, for example, in the case where the optical filter is a patterned retarder, it is possible to maximize the performance of the retarder in the device while minimizing crosstalk, and it is possible in that the device has excellent brightness. By using such a plastic base, it is also possible to provide the optical filter which is lightweight and thin and has excellent flexibility.

Conventionally, when a plastic base is used for the base of the optical filter, due to the inherent property of the plastic base, it is not possible to form an orientation pattern with high degrees of accuracy because the basis is formed by formation temperature, solvent, expansion and / or contraction of the orientable layer of the manufacturing process is severely impaired. However, according to the orientation treatment using the pressure-sensitive adhesive film of the present invention, it is possible to maximize the advantage of the plastic base without inducing the above problems.

Types of the orientable layer in the laminated film are not particularly limited, but any type of conventional orientable layer used in this field may be used. In one embodiment, the orientable layer may include compounds in which the direction of orientation is determined by a cis-trans isomerization reaction, a Fries rearrangement reaction and / or a dimerization reaction induced by irradiation with linearly polarized ultraviolet rays, and then the orientation of adjacent ones Liquid crystals can induce by the orientation direction determined therefrom. The orientable layer may include, for example, monomeric, oligomeric or polymeric compounds having at least one functional group or moiety selected from the group consisting of an azobenzene, a styrylbenzene, a coumarin, a chalcone, fluorine and a cinnamate, and may preferably include norbornene resin Fluorine or cinnamate unit.

Methods for forming the orientable layer on the base are not particularly limited, but may be, for example, a method in which the above-described compound is diluted with suitable solvents and then applied to the base by conventional coating methods such as roll coating, spin coating or bar coating , Also, the coating thickness of the orientable layer is not particularly limited.

In an embodiment, the photo-orientable layer may be a preliminary orientation-treated photo-orientable layer. For example, the preliminary orientation treatment may be carried out prior to attachment of the pressure-sensitive adhesive film by irradiating the photo-orientable layer with linearly polarized ultraviolet rays. In the preliminary orientation treatment, preferably, the entire surface of the orientable layer may be irradiated with linearly polarized ultraviolet rays.

When linearly polarized ultraviolet rays are irradiated more than once to orient the photo-orientable layer, the orientation direction is determined by the linearly-polarized ultraviolet rays irradiated last. Accordingly, when the orientable layer enclosed in the laminated film is preliminarily oriented by linearly polarized ultraviolet rays having a predetermined direction and then, after attaching the pressure-sensitive adhesive film, a secondary orientation treatment by irradiating linearly-polarized ultraviolet rays having a different direction of the linearly polarized ultraviolet rays in the preliminary orientation treatment is performed to effectively form an oriented pattern including at least a first oriented region having a first orientation direction and at least one second oriented region having a second orientation direction different from the first orientation direction or at least two types of regions with orientation directions that have different directions to each other.

In one embodiment, the preliminary orientation treatment may be performed with linearly polarized ultraviolet rays, and the linearly polarized ultraviolet rays may be ultraviolet rays linearly polarized to form a boundary of the light transmissive portion and the light blocking portion formed in the pressure-sensitive adhesive film. and form another than a right angle therewith, and may preferably be ultraviolet rays linearly polarized so as to intersect the boundary of the light transmissive portion and the light blocking portion formed in the pressure-sensitive adhesive film, and thus substantially at an angle 45 degrees form. In the present invention, when an angle is defined, errors are included within about ± 10 degrees, errors within about ± 5 degrees, and errors within about ± 3 degrees. In the above case, the secondary orientation treatment may be carried out also with linearly polarized ultraviolet rays, and the linearly polarized ultraviolet rays of the secondary orientation treatment may be ultraviolet rays linearly polarized to be the boundary of the light transmitting portion and the light blocking portion formed in the Adhesive film are formed, cut and form another than a right angle with it. Also in this case, it is preferable that the linearly polarized ultraviolet rays of the secondary orientation treatment have a direction to form an angle of about 90 degrees with that of the linearized polarized ultraviolet rays of the preliminary orientation treatment. By adjusting the directions of the linearly polarized ultraviolet rays of the preliminary and the secondary orientation treatment, it is possible to provide an optical filter having an excellent performance in the device.

The laminated film can be prepared by attaching the pressure-sensitive adhesive film to the photo-orientable layer which has been subjected to the preliminary orientation treatment or which is not oriented. In the case where the pressure-sensitive adhesive film includes a pressure-sensitive adhesive layer, the pressure-sensitive adhesive film may be fixed on the photo-orientable layer through the pressure-sensitive adhesive layer. It is preferable that the pressure-sensitive adhesive film is tightly attached to the photo-orientable layer. The term "close attachment" as used herein means the case where the gaps between the pressure-sensitive adhesive film and the photo-orientable layer substantially do not exist. By tightly attaching the pressure-sensitive adhesive film to the photo-orientable layer, it is possible to prevent the incident light from scattering within the distance, and therefore to irradiate the photo-orientable layer with light of desirable uniform intensity. It is also possible to prevent the boundary between oriented areas from becoming blurred and to prevent non-oriented areas from being generated.

The present invention also relates to a method for producing an optical filter by using the laminated film of the present invention. The method for producing an optical filter may include a step of irradiating the photo-orientable layer of the laminated film with light through the substrate of the pressure-sensitive adhesive film of the laminated film.

In the case where the photo-orientable layer is irradiated with light through the pressure-sensitive adhesive film, light can pass only through the transparent portion of the pressure-sensitive adhesive film, and thus only the portion of the photo-orientable layer corresponding to the light-transmissive portion of the pressure-sensitive adhesive film is oriented. That is, the orientation direction induced by the preliminary orientation treatment in the portion of the photo-orientable layer corresponding to the light-transmittable portion of the pressure-sensitive adhesive film is changed, or the unoriented portion of the photo-orientable layer corresponding to the light-transmitting portion of the pressure-sensitive adhesive film. is oriented.

As described above, the photo-orientable layer may be a photo-orientable layer preliminarily orientated with linearly polarized ultraviolet rays that are linearly polarized may be one-direction ultraviolet rays to intersect a boundary of the light transmitting portion and the light blocking portion formed in the pressure-sensitive adhesive film and to form another angle than a right angle therewith, and more preferably one-direction linearly polarized ultraviolet rays which intersect the boundary of the light transmissive portion and the light blocking portion formed in the pressure-sensitive adhesive film and form an angle of about 45 degrees therewith. In this case, the light irradiated for the secondary orientation treatment in the present method may be, and the light for the secondary orientation treatment may be linearly polarized ultraviolet rays having a direction coincident with a boundary of the light-transmissive portion and the light-blocking portion formed in the pressure-sensitive adhesive film are formed, intersect and form another than a right angle therewith, and also make an angle of substantially 90 degrees with the direction of the linearly polarized beams of the preliminary orientation treatment.

5 Fig. 12 is a drawing showing an illustrative example of the method of manufacturing an optical filter of the present invention. As shown in 5 (a) to (d), the process for producing an optical filter can be the formation of the photo-orientable layer 2 on the base 1 ( 5 (a) ), the preliminary orientation of the photoorientierbaren layer 2 with linearly polarized ultraviolet rays (arrows) ( 5 (b) ), the attachment of the pressure-sensitive adhesive film 3 on the photoorientierbaren layer 2 ( 5 (c) and then the secondary orientation of the photo-orientable layer by ultraviolet rays (arrows) which are linearly polarized to have a different direction from that of the linearly polarized ultraviolet rays in the preliminary orientation treatment ( 5 (d) ), lock in. By the above treatment areas can 21 and 22 be formed in the photoorientierbaren layer whose orientation directions are different from each other.

The process for producing an optical filter of the present invention can further remove the pressure-sensitive adhesive film 3 after irradiation with light and then forming a liquid crystal layer on the photo-orientable layer 2 as shown in the illustrative example of FIG 5 (e) and (f).

The above is a process for forming the liquid crystal layer 4 not particularly limited, and may include, for example, (a) applying and orienting photocrosslinkable and photopolymerizable liquid crystal compounds on the photo-orientable layer, and then (b) photocrosslinking or photopolymerizing the liquid crystal compounds. With the above treatment areas can 41 and 42 be formed on the photoorientierbaren layer in which the orientation directions of the liquid crystal compounds are different from each other.

The types of the liquid crystal compounds are not particularly limited, and they may be selected in consideration of the use of the optical filter. For example, in the case where the optical filter is a patterned retarder, the liquid crystal compounds may be compounds which can be oriented according to the oriented pattern of the photo-orientable layer and then converted by photocrosslinking or photopolymerization into a liquid crystal polymer layer shows a phase delay characteristic of λ / 4. By using such liquid crystal compounds, it is possible to produce a patterned retarder which can divide the irradiated light into left circularly polarized light and right circularly polarized light. Various liquid crystal compounds usable in accordance with the use of the optical filter are known in the art, and all of the above compounds can be used in the present invention.

In the above, methods for aligning the liquid crystal compounds according to the oriented pattern of the photo-orientable layer after applying them to the photo-orientable layer are not particularly limited, but any kind of known alignment method may be suitably selected and used.

According to the above, it is possible to form the liquid crystal layer such as the phase retardation layer by crosslinking or polymerizing the aligned liquid crystal compound by irradiation with appropriate light.

The present invention also relates to an optical filter having a base; and a photo-orientable layer formed on the base and having at least a first oriented region having a first orientation direction and at least one second oriented region having a second orientation direction different from the first orientation direction Ratio of the area of the non-oriented area in the photo-orientable layer, relative to the total area of the photo-orientable layer, is 10% or less.

In one embodiment, the optical filter may be an optical filter used in a stereoscopic image display, and may preferably be a structured retarder used in a stereoscopic image display.

In the above optical filter, the contents may be in terms of a usable base and photo-orientable layer as described above.

In the optical filter, an oriented pattern is formed on the photo-orientable layer, and specifically, an oriented pattern having at least one oriented area treated to have a first orientation direction and at least one second oriented area to be treated it has a second orientation direction different from the first orientation direction. In one embodiment, the first oriented region and the second oriented region may be in the form of stripes that extend in a common direction, and may be alternately disposed in the direction of the short side of the shape of stripes in the photo-orientable layer.

In the optical filter, the ratio of the area of unoriented area in the photo-orientable layer based on the total area of the photo-orientable layer is 10% or less, preferably 5% or less, and more preferably 2% or less. The non-oriented region may be formed, for example, by such a phenomenon as the diffusion of light generated while light irradiated for the orientation treatment passes through the spaces between a photo-orientable layer and a mask in the conventional orientation process. The non-oriented region may result in blurred boundaries between oriented regions and crosstalk in the device.

However, in the present invention, the orientation treatment may be carried out under the condition where the pressure-sensitive adhesive film capable of functioning as a mask is tightly fixed on the photo-orientable layer, and it is therefore possible to minimize generation of a non-oriented region.

In the above, the ratio of the area of the non-oriented area can be judged as below. That is, when the optical filter is placed between two polarizers whose light-absorbing axes are perpendicular to each other, with proper orientation of the optical filter's orientation directions along the light-absorbing axes of the polarizers, and then the polarizers are illuminated by a light source, light leak only in the ones -oriented areas is generated. Therefore, the ratio of the area of the non-oriented area can be judged by observing the areas where the light leakage is generated by a polarizing microscope under the condition as described above.

Also, the optical filter may have a cross coupling ratio of 5% or less, and more preferably 2% or less. The cross talk ratio can be calculated with the general formula 1 below.

[General Formula 1]

• X _T = (X _TL + X _TR ) / 2

In the general formula 1, X _{T represents} the crosstalk ratio of a stereoscopic image display using the optical filter, X _TL represents the crosstalk ratio, which is viewed with a left eye of a stereoscopic image display using the optical filter, and X _TR stands for the cross coupling ratio, which is considered with a right eye of a stereoscopic image display using the optical filter.

In General Formula 1, X _TL and X _TR can be calculated with the general formulas 2 and 3 below, respectively.

[General Formula 2]

• X _TL = {(L _(LB-RW) -L _(LB-RB) / (L _(LW-RB) -L _(LB-RB )}} × 100

[General Formula 3]

• X _TR = {(L _(LW-RB) -L _(LB-RB) / (L _(LB-RW) -L _(LB-RB )} × 100

In the general formulas 2 and 3, L _{(LB-RW) stands} for the brightness determined when the left-eye pixel is black and the right-eye pixel is white in a stereoscopic image display in which the optical L _(LB-RB) stands for the brightness determined when the left-eye pixel and the right-eye pixel are black, in a stereoscopic image display using the optical filter, and L _(LW-RB) stands for the brightness determined when the left-eye pixel is white and the right-eye pixel is black in a stereoscopic image display using the optical filter.

In the above, the methods for determining the brightness required for the calculation of the above general formulas 2 and 3 are not particularly limited, and they can be measured by using conventional methods known in the art.

In the present invention, it is possible to provide the optical filter with a low cross-talk ratio by preventing a non-oriented region from being generated because the photo-orientable layer is oriented by using the pressure-sensitive adhesive as described above.

The optical filter of the present invention may further include a liquid crystal layer formed on the photo-orientable layer. Also, in the case where the optical filter is a patterned retarder, the liquid crystal layer may be a phase retardation layer. In one embodiment, the phase delay layer may be a phase delay layer having a delay of λ / 4. A pattern may be formed in the phase retardation layer formed thereon in accordance with the oriented pattern of the photoorientable layer and the at least one first region having a first retardation axis of a first direction and at least one second region having a second retardation axis of a second direction extending from the direction the first delay axis is different. Also, for example, the first and second regions may be in the form of stripes extending in a common direction and alternately arranged in the direction of the short side of the shape of stripes, as in FIG 2 ,

In the above, the first retardation axis of the first region may have a direction intersecting the boundary of the first and second regions and forming an angle other than a right angle, for example, substantially 45 degrees therewith. Also, the second retardation axis of the second region may have a direction intersecting the boundary of the first and second regions and forming an angle other than a right angle and forming an angle of substantially 90 degrees with the direction of the first retardation axis.

The phase retardation layer having a retardation of λ / 4 and having a relation of the retardation axes can form left circularized light and right circularized light, respectively, when used in a stereoscopic image display.

The present invention also relates to a stereoscopic image display including the optical filter as described above.

In one embodiment, the optical filter may be a patterned retarder, and the stereoscopic image display may be a stereoscopic image display for use with polarizing glasses.

In the stereoscopic image display as described above, elements constituting the device or the working principles are not particularly limited, and any type of conventional devices may be used as long as the device includes the optical filter of the present invention.

6 FIG. 10 is a cross-sectional view of an illustrative example of the invention according to an embodiment. FIG.

the display 60 may be a type for use with polarizing glasses, which displays a three-dimensional image to a viewer (not shown) who puts on polarizing glasses. the display 60 can by sequentially arranging a backlight unit 61 , a display screen 62 , such as a liquid crystal display disk, and a retarder 63 be configured. In the above, the retarder can 63 The optical filter of the present invention may be a base 631 , a photo-orientable layer (not shown in FIG 6 ) formed on the base and a liquid crystal layer 632 which is formed on the photo-orientable layer and which includes the first and second regions 632A and 632B as described above. The liquid crystal layer 632 may be the phase delay layer. In the display 60 is a surface of the retarder 63 a picture display surface and points to the viewer side. In addition, the display 60 in the embodiment, arranged such that the image display surface is parallel to a vertical surface (vertical surface, a yz plane in FIG 6 ). Further, the image display surface may, for example, have a rectangular shape, and a longitudinal direction of the image display surface is parallel to a horizontal direction (y-axis direction in the figure). Further, the viewer looks at the image display surface while putting the polarizing glasses in front of his eyes.

The backlight unit 61 For example, a reflective plate, a light source, and an optical layer (all not shown) may be included. The reflecting plate returns light emitted from the light source to the optical layer side, and has the function of reflection, scattering, diffusion, and the like. The reflective plate includes, for example, PET (polyethylene terephthalate) foam. Thus, light emitted from the light source can be efficiently used. The light source irradiates the display screen 62 from behind and may include, for example, a plurality of linear light sources arranged in parallel at constant intervals, or a plurality of point-like light sources arranged in a two-dimensional grid. In addition, as the linear light source, for example, a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL) or the like are listed. As the point-like light source, for example, a light-emitting diode (LED) or the like is listed. The optical layer uniforms the luminescence distribution of the in-plane light from the light source, or adjusts a divergence angle or state of polarization of the light from the light source to a specific area, and includes, for example, a diffusion plate, a diffusion layer, a prism layer, a reflective polarizing element, and a Phase difference plate on. Further, the light source may be an edge light type. In such a case, if necessary, a light guiding plate or a light guiding film is used.

The display screen 62 The semiconductor laser device may be a transmissive liquid crystal display disk in which a plurality of pixels are arranged two-dimensionally in the direction of rows and columns, and drives each pixel in accordance with an image signal for the image display. As described above, the pixels, such as in 3 shown, the pixel for a left eye and the pixel for a right eye. The display screen 62 For example, it can be a transparent substrate 622 , Pixel electrodes 623 , an orientation film 624 , a liquid crystal layer 625 , an orientation film 626 , a common electrode 627 , a color filter 628 and a transparent substrate 629 (Counter substrate) in this order from the side of a backlight unit 10 as shown in FIG 6 , Also, in the present invention, a first polarizing plate 621A on the transparent substrate 622 attached, and a second polarizing plate 621B is on the transparent substrate 629 attached.

The first polarizing plate 621A is on the light incident side of the display screen 62 arranged, and the second polarizing plate 621B is on the light exit side of the display screen 62 arranged. The polarizing plates 621A and 621B are a kind of optical shutter and let only light (polarized light) in a certain direction of vibration through. The polarizing plates 621A and 621B For example, they are arranged such that their polarizing axes are different from each other by a certain angle (for example, 90 degrees), so that emitted light from the backlight unit 61 is transmitted through the liquid crystal layer or blocked by the liquid crystal layer.

A direction of an absorbing axis (not shown) of the first polarizing plate 621A is set in an area where light coming from the backlight unit 61 is emitted, can be transmitted. For example, if a polarization axis of light, that of the backlight unit 61 is emitted in a vertical direction, the transmission axis of the polarizing plate extends 621A also in a vertical direction, and when a transmission axis of light coming from the backlight unit 61 is emitted in a horizontal direction, the transmission axis of the polarizing plate extends 621A also in a horizontal direction. In addition, the light that comes from the backlight unit 61 is not limited to linearly polarized light and may be circularly or elliptically polarized light or non-polarized light.

The direction of an absorbing axis of the second polarizing plate 621B is in a transmissible range of light coming from the display screen 62 is let through, set. When an absorbing axis of the first polarizing plate 621A for example, in a horizontal direction, extends the absorbing axis of the second polarizing plate 621B in a direction (vertical direction) orthogonal to the horizontal direction. When the absorbing axis of the first polarizing plate 621A is in a vertical direction, the absorbing axis of the second polarizing plate extends 621B in a direction (horizontal direction) orthogonal to the vertical direction.

The transparent substrates 622 and 629 are typically transparent to visible light. In addition, a transparent substrate has on the side of a backlight unit 61 for example, an active driving circuit formed thereon, the circuit including TFT (thin film transistor) as driving elements electrically connected to transparent pixel electrodes, and wirings. The pixel electrodes 623 include, for example, indium tin oxide (ITO) and function as electrodes for each pixel. The registration movie 624 For example, a polymeric material, such as polyimide, is included for the alignment treatment of the liquid crystals. The liquid crystal layer 625 includes, for example, liquid crystal with VA (vertical alignment) mode, liquid crystal with TN (twisted nematic) mode, or liquid crystal with STN (super twisted nematic) mode. The liquid crystal layer 625 has the function of passing or blocking light from the backlight unit 61 is emitted for each pixel in response to applied voltage from a non-shown drive circuit. The common electrode 627 includes, for example, ITO and functions as a common counter electrode. The color filter 628 is achieved by arranging filter sections 628A for separating light from a backlight unit 61 is emitted, for example, corresponding light of the three primary colors red (R), green (G) and blue (B) is formed. The color filter 628 has a black matrix section 628B with a light-blocking function in an area between the filter sections 628A according to a boundary between the pixels.

In one embodiment, the optical filter 63 of the present invention, light coming from the second polarizing plate 621B is irradiated, split into left circularly polarized light and right circularly polarized light, and delivers it to a viewer with polarizing glasses.

Advantageous effects

In the present invention, a pressure-sensitive adhesive film for orientation treatment in a photo-orientable layer which can prevent generation of non-oriented areas and form the oriented pattern with high degrees of accuracy and an optical filter production method using the pressure-sensitive adhesive film can be provided. Further, the present invention can provide an optical filter and a stereoscopic image display with excellent performances.

Best way

The present invention will be explained in more detail by the following examples according to the present invention and comparative examples, which do not belong to the present invention, to which the scope of the present invention is not limited.

example 1

Preparation of the PAS film for an orientation treatment

The light-blocking portions were formed on triacetyl cellulose (TAC) film (UZ80, manufactured by FUJI) which was a transparent sheet by printing light-blocking inks. In this case, the light blocking portions were formed to have the shape of stripes, and the light transmitting portion and the light blocking portion were alternately arranged as in FIG 2 , The pitch (P) of the light transmitting portion and the light blocking portion was about 1080 μm, and the distance between the adjacent light blocking portions was about 540 μm, and the printing height of the inks was about 1.5 μm. Subsequently, a pressure-sensitive adhesive film for an orientation treatment was prepared by forming a pressure-sensitive adhesive layer on one side of the TAC base opposite to the pressure side thereof by using acrylic pressure-sensitive adhesive. An image of the front side of the prepared pressure-sensitive adhesive film is in 7 shown.

Production of the optical filter

Using the pressure-sensitive adhesive film, an optical filter was fabricated as shown in FIG 5 , First, the photoorientierbare layer 2 of the polycinnamate type on a triacetylcellulose basis 1 with a thickness of 80 microns so formed that the layer 2 had a thickness of 1,000 Å when she was dried. The photoorientierbare layer 2 was formed by applying a solution to form a photo-orientable layer on the base 1 applied by a roll coating method and solvents were eliminated by drying at 80 ° C for 2 minutes. The solution (polynorbornene: acrylic monomers: photoinitiator = 2: 1: 0.25 (weight ratio)) was prepared by mixing a mixture of polynorbornene (weight average molecular weight: 150,000) with cinnamate group represented by formula 1 below, and acrylic monomers with a photoinitiator (Igacure 907) was mixed and dissolved in cyclohexanone solvent, so that the solids content of the polynorbornene was 2 wt .-%.

[Formula 1]

Subsequently, the photoorientierbare layer 2 preliminarily oriented by irradiation with linearly polarized ultraviolet rays (300 mW / cm ² ). A polarization direction of the linearly polarized ultraviolet rays in the preliminary orientation was set to coincide with a boundary of the light transmitting portion T and the light blocking portion B of the pressure-sensitive adhesive film 3 which is attached after the preliminary orientation treatment forms an angle of substantially 45 degrees. After preliminary orientation the pressure-sensitive adhesive film became 3 through the pressure-sensitive adhesive layer closely on the photo-orientable layer 2 attached. Subsequently, a secondary orientation was obtained by irradiation of the photo-orientable layer 2 with linearly polarized ultraviolet rays (300 mW / cm ² ) through the pressure-sensitive adhesive film 3 passed through. In the secondary orientation, the polarization direction of the linearly polarized ultraviolet rays was set to make an angle of 90 degrees with the polarization direction of the linearly polarized ultraviolet rays in the preliminary orientation. After completion of the orientation process, the pressure-sensitive adhesive film 2 subtracted, and a phase delay layer 4 with a phase retardation property of λ / 4 was formed thereon. Concretely, the liquid crystal compounds (LC242 ^®, manufactured by BASF) on the photo-orientable layer is applied so as to have a thickness of 1 micron, when they were dried, they were oriented according to the pattern of the photo-orientable layer 2 and were crosslinked by irradiation with ultraviolet rays (300 mW / cm ² ) for about 3 seconds and polymerized to prepare an optical filter including two kinds of regions with retardation axes with different directions to each other according to the oriented pattern of the photoorientable layer 2 ,

Comparative Example 1

An optical filter was prepared by the same method as in Example 1 except that the pressure-sensitive adhesive film 2 was not used, and a mask was used, which was used in a conventional manner for the orientation of a photo-orientable layer. More specifically, the secondary orientation treatment was performed by irradiating the preliminarily treated photo-orientable layer with the linearly polarized ultraviolet rays through the mask under the condition that the mask was mounted on the photo-orientable layer and the distance between the mask and the photo-orientable layer was 0, 7 mm was kept.

Comparative Example 2

An optical filter was prepared by the same method as in Example 1 except that the pressure-sensitive adhesive film 2 was not used, and a mask was used, which was used in a conventional manner for the orientation of a photo-orientable layer. More specifically, the secondary orientation treatment was carried out by irradiating the preliminarily treated photo-orientable layer with the linearly polarized ultraviolet rays through the mask under the condition where the mask was mounted on the photo-orientable layer and the distance between the mask and the photo-orientable layer at 1, 1 mm was kept.

1. Evaluation of the oriented pattern

The oriented samples of Example 1 and Comparative Examples 1 and 2 were evaluated. 8th FIG. 15 is an enlarged image of the oriented photo-orientable layer of Example 1 and FIG 9 FIG. 13 is an enlarged image of the phase retardation layer on the oriented photo-orientable layer of Example 1. FIG. 10 FIG. 15 is an enlarged image of the oriented photo-orientable layer of Comparative Example 1, and FIG 11 FIG. 15 is an enlarged image of the phase retardation layer on the oriented photo-orientable layer of Comparative Example 1. FIG. 12 is an enlarged image of the oriented photo-orientable layer of Comparative Example 2. As clearly confirmed from the figures, in Example 1, the boundary of the oriented pattern becomes clear is observed, and a phase retardation layer having high degrees of accuracy is formed. In Comparative Examples 1 and 2, on the other hand, the boundary of the oriented pattern is very blurred.

2. Evaluation of non-oriented area and cross-coupling ratio

With respect to the oriented photo-orientable layers of Example 1 and Comparative Examples 1 and 2, the ratio of the area of non-oriented area in the photo-orientable layer relative to the total area of the photo-orientable layer was evaluated. The cross-coupling ratios with respect to all oriented photo-orientable layers were also evaluated.

In the above, the ratio of the area of unoriented area was evaluated by considering the areas in which light leakage is generated with a polarizing microscope under the condition that the optical filter was sandwiched between two polarizers, their light absorbing axes being perpendicular with approximately orientation of the optical filter's directions of orientation along the light absorbing axes of the polarizers, and then the polarizers were illuminated by a light source.

The crosstalk ratio was also evaluated by applying the optical filter to a conventional stereoscopic image display used with polarizing glasses and then applying the brightness 1.8 m away from the center of the image display surface of the stereoscopic image display with changing brightness of the unit pixel for right eye and the unit pixel for a left eye. The cross coupling ratio was calculated with the general formulas 1 to 3 above the detected brightness.

The results of the evaluations are shown in Table 1 below. Table 1 The ratio of the area of non-oriented area (%) The cross-coupling ratio (%) example 1 About 0.9 0.5 Comparative Example 1 About 37 10 Comparative Example 2 About 93 or more 20

As clearly confirmed from Table 1, in Example 1, the ratio of the area of non-oriented region in the photo-orientable layer and the cross-coupling ratio are minimized.

13 FIG. 12 is an image of a stereoscopic image display using the optical filter manufactured in Example 1 and viewed with polarizing glasses. 13 (a) is an image that is viewed with a polarizing glass for a right eye, and 13 (b) is an image that is viewed with a polarizing glass for a left eye.

As in 13 As shown, when left-eye and right-eye images having different polarizing properties from each other and coming from the optical filter of the present invention are viewed with one side of the polarizing glasses, they are shown as being black when viewed perpendicularly with respect to the polarizing glasses Orientation direction of a phase retardation film of the polarizing glasses, and they are shown as white when they are parallel with respect to the direction of orientation of a phase retardation film of the polarizing glasses. Also, it is confirmed that the black and white in the same movie are significantly changed when viewed with the other side of the polarizing glasses.

Brief description of the drawings

1 Fig. 12 is a cross-sectional drawing showing an example of the substrate contained in the pressure-sensitive adhesive film of the present invention.

2 Fig. 12 is a drawing showing an illustrative example of the substrate viewed from the top thereof.

3 Fig. 12 is a drawing showing an illustrative example of shapes of a unit pixel UL for forming a left eye image and a unit pixel UR for forming a right eye image in an image display element.

4 Fig. 10 is a cross-sectional drawing of an illustrative example of the pressure-sensitive adhesive film.

5 Fig. 12 is a drawing showing an illustrative example of the method of manufacturing an optical filter of the present invention.

6 is a cross-sectional drawing of an illustrative example of the display.

7 FIG. 16 is a front image of the pressure-sensitive adhesive film prepared in Example 1. FIG.

8th FIG. 15 is an enlarged image of the oriented photo-orientable layer of Example 1. FIG.

9 FIG. 13 is an enlarged image of the phase retardation layer on the oriented photo-orientable layer of Example 1. FIG.

10 FIG. 16 is an enlarged image of the oriented photo-orientable layer of Comparative Example 1. FIG.

11 FIG. 15 is an enlarged image of the phase retardation layer on the oriented photo-orientable layer of Comparative Example 1. FIG.

12 FIG. 10 is an enlarged image of the oriented photo-orientable layer of Comparative Example 2. FIG.

13 FIG. 12 is an image of a stereoscopic image display using the optical filter manufactured in Example 1, viewed with polarizing glasses.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• KR 2010-0005907 [0002]

Claims (15)

A pressure-sensitive adhesive film for an orientation treatment in a photo-orientable layer, comprising a substrate in which at least one light-transmissive portion and at least one light-blocking portion are formed. The pressure-sensitive adhesive film for orientation treatment in a photo-orientable layer according to claim 1, wherein the light-transmitting portion and the light-blocking portion are in the form of stripes extending in a common direction and alternately arranged toward the short side of the stripes. The pressure-sensitive adhesive film for orienting treatment in a photo-orientable layer according to claim 2, wherein the photo-orientable layer is a photo-orientable layer for a stereoscopic image display optical filter, and wherein the pitch of the translucent portion and the light blocking portion adjacent thereto is twice as long as the width of one A unit pixel forming a right-eye image or a unit pixel forming a left-eye image in an element for displaying images in the stereoscopic image display. The pressure-sensitive adhesive film for orientation treatment in a photo-orientable layer according to claim 3, wherein the distance between the light-blocking portions has the same value as the width of the unit pixel forming a right-eye image or the unit pixel forming a left-eye image , The pressure-sensitive adhesive film for orientation treatment in a photo-orientable layer according to claim 1, wherein the substrate comprises a light-transmissive film and light-blocking or light-absorbing inks forming the light-blocking portion on the film. The pressure-sensitive adhesive film for orientation treatment in a photo-orientable layer according to claim 1, further comprising a pressure-sensitive adhesive layer formed on at least one side of the substrate and used to fix the substrate on the photo-orientable layer. A laminated film for producing an optical filter comprising a base, a photo-orientable layer formed on the base, and the pressure-sensitive adhesive film of claim 1 attached to the photo-orientable layer. The laminated film for producing an optical filter according to claim 7, wherein the photo-orientable layer is a preliminary orientation-treated photo-orientable layer. A method for producing an optical filter, comprising irradiating the photo-orientable layer of the laminated film according to claim 7 with light through the substrate in the pressure-sensitive adhesive film of the laminated film. The method for producing an optical filter according to claim 9, further comprising releasing the pressure-sensitive adhesive film after the irradiation with light, and then forming a liquid crystal layer on the photo-orientable layer. The process for producing an optical filter according to claim 10, wherein the step of forming a liquid crystal layer comprises (a) applying and orienting photocrosslinkable or photopolymerizable liquid crystal compounds to the photo-orientable layer, and then (b) photocrosslinking or photopolymerizing the liquid crystal compounds. An optical filter comprising One Base; and a photo-orientable layer formed on the base and having at least a first oriented region having a first orientation direction and at least one second oriented region having a second orientation direction different from the first orientation direction; wherein the ratio of the area of unoriented area in the photo-orientable layer based on the total area of the photo-orientable layer is 10% or less. The optical filter according to claim 12, which has a cross-coupling ratio represented by General Formula 1 of 5% or less: [General Formula 1] X _T = (X _TL + X _TR ) / 2 in the general formula 1, X _T for the crosstalk ratio of a stereoscopic image display using the optical filter, X _TL for the crosstalk ratio when viewed with a left eye, a stereoscopic image display using the optical filter, and X _TR for the cross coupling ratio, as viewed with a right eye, of a stereoscopic image display using the optical filter. The optical filter of claim 12, further comprising a phase retardation layer formed on the photo-orientable layer. A stereoscopic image display including the optical filter according to claim 12.

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