KR101602014B1 - Optical filter - Google Patents

Abstract

The present invention relates to an optical filter, a manufacturing method of the optical filter, and a display device including the optical filter. An exemplary optical filter may be a light splitting element, for example, a filter that splits incident light into two or more kinds of lights having different polarization states from each other. The optical filter can be used, for example, for realizing a stereoscopic image.

Description

OPTICAL FILTER

The present application relates to an optical filter, a manufacturing method thereof, and a display device.

Techniques for dividing light into two or more kinds of lights having different polarization states from each other can be usefully used in various fields.

The above-described optical segmentation technique can be applied, for example, to the production of stereoscopic images. The stereoscopic image can be implemented using binocular parallax. For example, when two two-dimensional images are input to the left and right eyes of a human, input information is transmitted and fused to the brain, so that a human senses a three-dimensional perspective and real feeling. In this process, .

The stereoscopic image generation technique can be usefully used in 3D measurement, 3D TV, camera, or computer graphics.

Japanese Patent Laid-Open No. 2005-049865 Korean Patent No. 0967899 Korea Patent Publication No. 2010-0089782

The present application provides an optical filter, a manufacturing method thereof, and a display device.

An exemplary optical filter may include an alignment layer and a liquid crystal layer. The alignment layer of the optical filter may have irregularities formed by convex portions, and the liquid crystal layer may be formed on the surface of the alignment layer on which the irregularities are formed. 1 is a side view of an exemplary optical filter showing an alignment layer 101 having irregularities formed by convex portions 1011 and a liquid crystal layer 102 formed on the irregularities of the alignment layer 101 .

The liquid crystal compound included in the liquid crystal layer can be oriented by the unevenness formed in the orientation layer in the optical filter. For the orientation of the liquid crystal compound, the unevenness of the orientation layer may be formed to a predetermined size. For example, the protrusions forming the concavities and convexities may have a width of about 0.5 to 3.5 mu m, 0.5 mu m to 3.4 mu m, 0.5 mu m to 3.3 mu m, 0.5 mu m to 3.2 mu m, 0.5 mu m to 3.1 mu m, or 0.5 mu m to 3.0 mu m Lt; / RTI > The width of the convex portion means the width of the convex portion when the surface on which the concavo-convex portion of the orientation layer is formed is observed from above, and when the width can be measured with respect to one convex portion, It can mean a small number. The convex portion may also have a pitch of about 0.5 탆 to 9.5 탆. The pitch of the convex portions means a distance from a point where one convex portion starts to a point where another convex portion adjacent to the convex portion starts when the surface having concave and convex portions of the alignment layer is observed from above. In the case where a plurality of pitches can be measured as in the case of the width, the smallest value among the measured pitches can be adjusted within the above range. Further, the convex portion may have a height of, for example, about 0.1 탆 to 1.2 탆. Fig. 2 is a side view of an exemplary orientation layer, and the above-mentioned width W, pitch P and height H are shown. The liquid crystal compound of the liquid crystal layer can be properly oriented by the irregularities formed by the convex portions having the width, pitch and / or height in the above-mentioned range. Specifically, in one example, when the height of the convex portion is in a lower range than the above-mentioned range, the more the concavities and convexities formed by the convex portions are, the more properly the liquid crystal compound can be oriented. For example, when the height of the convex portion is 0.1 占 퐉 to 0.6 占 퐉, the pitch of the concavity and convexity formed by the convex portion may be 0.7 占 퐉 to 7.5 占 퐉, 0.7 占 퐉 to 7.0 占 퐉, or 0.7 占 퐉 to 6.5 占 퐉. Further, in another example, when the height of the convex portion is higher than the above-mentioned range, the liquid crystal compound can be properly oriented even when the concavity and convexity formed by the convex portion is largely formed. For example, when the height of the convex portion is 0.6 占 퐉 to 1.2 占 퐉, the pitch of the concavity and convexity formed by the convex portion may be 0.9 占 퐉 to 9.5 占 퐉, 1.0 占 퐉 to 9.5 占 퐉, or 1.5 占 퐉 to 9.5 占 퐉.

The irregularities formed on the surface of the orientation layer can be formed into various shapes by the convex portions as described above. For example, the irregularities may be formed by two or more convex portions. For example, the irregularities may be formed by two or more convex portions having a stripe shape disposed in parallel with each other. In this case, as shown in Fig. 3, for example, the concavities and convexities are formed such that stripe-shaped convex portions 13 and concave portions 14 formed between the convex portions 13 are adjacent to each other And may be in a deployed form. The concave-convex structure may be formed by convex portions having substantially the same shape and size as each other, or may be formed by convex portions of two or more types of stripe-shaped convex portions having different shapes and / or sizes from each other. In addition, the width, height, and / or pitch of each convex portion and / or concave portion are substantially equal to each other, so that irregularities may have a periodicity or may have an irregularity because they are different.

The terms vertical, horizontal, orthogonal, or parallel as used herein may mean substantially vertical, horizontal, orthogonal, or parallel, respectively, without substantially affecting the desired effect. For example, each of the above terms is based on, for example, a manufacturing error or a variation. For example, an error within about ± 15 degrees, an error within about ± 10 degrees, An error within 5 degrees or an error within about +/- 3 degrees.

In another example, the concavity and convexity of the orientation layer may be a concavity formed by the convex portion and the convex portion arranged in a lattice form. In the case of the concavo-convex structure of the lattice shape, for example, when the optical filter is used for forming a stereoscopic image as described later, a line irrelevant to the image is observed at the time of observing the stereoscopic image, Can be prevented. The lattice-like concavo-convex structure may be formed by convex portions having substantially the same shape and size as each other, or may be formed by two or more convex portions whose shapes and / or sizes are different from each other. In addition, the width, height, and / or pitch of each convex portion and / or concave portion are substantially equal to each other, so that irregularities may have a periodicity or may have an irregularity because they are different. For example, the lattice shape may be regularly formed, or it may be formed in a shifted lattice shape, and in another example, it may be formed in an irregular lattice shape. Figs. 4 to 7 are views showing the respective lattice shapes as described above formed by the convex portion 13 and the concave portion 14. In Fig. 4, regular lattices are shown. Fig. 5 to Fig. 7 are cross- Shape or an irregular lattice shape.

The orientation layer may be formed using various materials as long as it is formed in the above-described shape. For example, the orientation layer may be a resin layer formed using a polymer compound. The resin layer may include, for example, a room temperature curable type, a moisture curing type, a thermosetting type or an active energy ray curable resin composition in a cured state, and in one example, a thermosetting or active energy ray curable resin composition can do. The term " cured state " as used herein may mean a state in which the components included in each resin composition form a crosslinked or uncrosslinked macromolecular compound through a crosslinking reaction or a polymerization reaction. The above-mentioned room temperature curing type, moisture curing type, thermosetting type or active energy ray curable type resin composition can be prepared by heating the cured state at room temperature or by heating in the presence of appropriate humidity or irradiation of active energy rays ≪ / RTI > composition.

In one example, the resin composition may be a composition capable of forming a resin layer which is cured to mainly contain an acrylic compound, an epoxy compound, a urethane compound, a phenol compound, a urethane acrylate compound or a polyester compound. In this case, the resin layer may include the above-described compounds. In the above, the "compound" may be a monomeric, oligomeric or polymeric compound. In this field, various resin compositions capable of forming the resin layer as described above are known.

The method of forming the concavo-convex in the resin layer is not particularly limited. For example, as described later, the layer of the resin composition can be formed in contact with a mold having a desired concavo-convex structure.

The liquid crystal layer formed on the alignment layer may include first and second regions having different phase delay characteristics from each other. The liquid crystal layer may be formed entirely on the alignment layer, or may be formed only in a part of the alignment layer. In the present specification, when the phase delay characteristics between regions are different from each other, in the state where all of the object regions have phase delay characteristics, the regions have optical axes which are formed in the same or different directions, In the case of different areas; The case where the first and second regions have the same phase difference, the direction of the optical axis formed in each region is different and the case where any one of the first and second regions has a retardation and the other region is an isotropic region . In this specification, the term optical axis may refer to a slow axis or a fast axis in the process of transmitting light through the corresponding region, and may mean, for example, a ground axis.

In one example, the first and second regions may be formed so that, when light linearly polarized in the same direction is incident, the first and second regions can be divided into circularly polarized light or elliptically polarized light having mutually opposite rotational directions. An example of such a region is a case where both the first and second regions are formed in a direction in which the optical axes are different from each other with a quarter wavelength layer, or a region of either of the first and second regions is a quarter wavelength layer, May be exemplified in the case of a 3/4 wavelength layer and the like. For example, the first region may be a quarter-wave layer having an optical axis in a first direction, and the second region may be a quarter-wave layer having an optical axis in a second direction different from the first direction. As used herein, the term n-wavelength layer may refer to a phase delay layer capable of retarding the incident light by n times its wavelength. In the above, n may be, for example, 1/2, 1/4 or 3/4.

The liquid crystal layer may include, for example, a liquid crystal compound which is aligned by the underlying alignment layer. The first and second regions of the above-described shape can be formed by adjusting the alignment direction or kind of the liquid crystal compound or the thickness of the liquid crystal layer.

The liquid crystal compound may be contained in the liquid crystal layer in a homogeneous, homeotropic, tilted, splay or cholesteric orientation, for example. In one example, the liquid crystal compound may be included in a horizontally oriented state. As used herein, the term horizontal alignment means that the optical axis of the liquid crystal layer comprising the liquid crystal compound is in the range of about 0 degrees to about 25 degrees, about 0 degrees to about 15 degrees, about 0 degrees to about 10 degrees, about 0 degrees To about 5 degrees or about 0 degrees.

The first and second regions of the liquid crystal layer may be formed in various shapes. For example, the first region of the liquid crystal layer may be a region formed on the convex portion of the alignment layer, and the second region may be a region formed on the concave portion of the alignment layer. In this case, the first and second regions may have a shape corresponding to the pattern of the convex portion and the concave portion of the orientation layer. That is, the first and second regions may be patterned into the regular lattice shape, the displaced lattice shape, or the irregular lattice shape in a stripe form or a lattice form arranged in parallel with each other.

In one example, the liquid crystal compound of the liquid crystal layer may be a polymerizable liquid crystal compound. The term polymerizable liquid crystal compound may mean a compound containing a moiety capable of exhibiting liquid crystallinity such as a mesogen skeleton and containing at least one polymerizable functional group. The liquid crystal compound may be contained in the liquid crystal layer in the state that the liquid crystal polymer is polymerized with each other, for example. The liquid crystal layer may further contain a polymerizable liquid crystal compound in a non-polymerized state, or may further contain known additives such as a stabilizer, a non-polymerizable non-liquid crystalline compound, or an initiator.

In one example, the liquid crystal compound may include a multifunctional polymerizable liquid crystal compound as the polymerizable liquid crystal compound. The term multifunctional polymerizable liquid crystal compound may mean a polymerizable liquid crystal compound containing two or more polymerizable functional groups. The polyfunctional polymerizable liquid crystal compound contains 2 to 10, 2 to 8, 2 to 6, 2 to 5, 2 to 4, 2 to 3 or 2 polymerizable functional groups can do.

The polymerizable liquid crystal compound may be, for example, a compound represented by the following formula (1).

[Chemical Formula 1]

In formula (1), A is a single bond, -COO- or -OCO-, and R ₁ to R ₁₀ are each independently hydrogen, halogen, alkyl group, alkoxy group, or a substituent of the formula 2, R ₁ to R ₅ pair of two adjacent substituents of R ₆ to R ₁₀ or a pair of two substituents adjoining are connected to each other but form a benzene substituted with -TQP, R ₁ to at least one of R ₁₀ may be a substituent of the formula -TQP or 2, R ₁ to R _5, or two substituents R ₆ to R _10, at least one pair of the two adjacent substituents of the adjoining are connected to each other -TQP -O-, -CO-, -COO-, -OCO- or -OCOO-, Q is an alkylene group or an alkylidene group, P is an alkenyl group , An epoxy group, a cyano group, a carboxyl group, an acryloyl group, a methacryloyl group, an acryloyloxy group, Methacryloyloxy group:

(2)

R ₁₁ to R ₁₅ are each independently hydrogen, a halogen, an alkyl group, an alkoxy group, a cyano group, a nitro group or -TQP, and R ₁₁ to R ₁₅ is -TQP, T is a single bond, -O-, -CO-, -COO-, -OCO- or -OCOO-, Q is an alkylene group or an alkylidene group, An alkoxy group, an alkenyl group, an epoxy group, a cyano group, a carboxyl group, an acryloyl group, a methacryloyl group, an acryloyloxy group or a methacryloyloxy group.

는, 그 부위가 모 화합물(mother compound)에 연결되는 것을 의미할 수 있다. 예를 들어, 상기 화학식 2에서 B의 좌측의

는, B가 화학식 1의 벤젠에 직접 연결되는 것을 의미할 수 있다. In this specification,

May mean that the moiety is connected to a mother compound. For example, in Formula 2,

May mean that B is directly linked to the benzene of formula (1).

As used herein, the term single bond may mean that there is no separate atom or group at that site. For example, in the above formulas (1) and (2), the term "single bond" means a case where no separate atom exists in the part represented by A or B. For example, when A is a single bond in formula (I), benzene on both sides of A may be directly connected to form a biphenyl structure.

As the halogen in the present specification, fluorine, chlorine, bromine or iodine and the like can be exemplified.

As used herein, the alkyl group includes, unless otherwise specified, a linear or branched alkyl group having 1 to 20 carbon atoms, a carbon number of 1 to 16, a carbon number of 1 to 12, a carbon number of 1 to 8, or a carbon number of 1 to 4, Cycloalkyl groups having 3 to 16 carbon atoms, 3 to 12 carbon atoms, 3 to 8 carbon atoms, or 3 to 6 carbon atoms may be exemplified. The alkyl group may be optionally substituted with one or more substituents.

As the alkoxy group in the present specification, an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms may be exemplified, unless otherwise specified. The alkoxy group may be linear, branched or cyclic. In addition, the alkoxy group may be optionally substituted with one or more substituents.

The alkylene group or the alkylidene group in the present specification includes, unless otherwise specified, an alkylene group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, 1 to 4 carbon atoms, 3 to 20 carbon atoms, An alkylene group or an alkylidene group having 3 to 12 carbon atoms or 3 to 8 carbon atoms may be exemplified. The alkylene group or alkylidene group may be linear, branched or cyclic. In the above, the cyclic alkylene group or the alkylidene group may be an alkylene group or an alkylidene group including an aliphatic cyclic structure. The aliphatic ring structure may have one or two or more rings. Two or more rings may include a case where one or two or more carbons are included as common components in two or more rings different from each other. The alkylene or alkylidene group may be optionally substituted by one or more substituents

As the alkenyl group in the present specification, an alkenyl group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms may be exemplified, unless otherwise specified. The alkenyl group may be linear, branched or cyclic. In addition, the alkenyl group may be optionally substituted with one or more substituents.

In the present specification, any compound or substituent which may be substituted for the substituent includes an alkyl group, an alkoxy group, an alkenyl group, an epoxy group, a cyano group, a carboxyl group, an acryloyl group, a methacryloyl group, an acryloyloxy group, A silyl group, an aryl group, and the like, but is not limited thereto.

In the formulas (1) and (2), P may be, for example, an acryloyl group, a methacryloyl group, an acryloyloxy group or a methacryloyloxy group.

-TQP, which may be present in at least one of the formulas (1) and (2) or the moiety of the formula (2), may for example be present at the position of R ₃ , R ₈ or R ₁₃ , for example, Can exist. Further, substituents other than the -TQP or the residue of the formula (2) in the compound of the formula (1) or the residue of the formula (2) include, for example, hydrogen, halogen, a linear or branched alkyl group of 1 to 4 carbon atoms, An alkyl group, a cyano group, an alkoxy group having 1 to 4 carbon atoms, or a nitro group. In another example, the substituent other than the -TQP or the residue of the formula (2) is hydrogen, chlorine, a straight or branched alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, .

The liquid crystal layer may further include a monofunctional polymerizable liquid crystal compound when necessary. The term " monofunctional polymerizable liquid crystal compound " may mean a compound containing one polymerizable functional group in the liquid crystal compound. The use of the multifunctional and monofunctional polymerizable compound together can effectively control the phase delay characteristics of the liquid crystal layer and can also stably maintain the implemented phase delay characteristics such as the optical axis of the phase delay layer or the phase delay value . As the monofunctional polymerizable liquid crystal compound, a compound having the structure of Formula 1 and containing only one polymerizable functional group may be used.

When the liquid crystal layer further comprises a monofunctional polymerizable liquid crystal compound, the monofunctional polymerizable liquid crystal compound may be added in an amount of 0 to 100 parts by weight, 1 to 90 parts by weight per 100 parts by weight of the multifunctional polymerizable liquid crystal compound , 1 part by weight to 80 parts by weight, 1 part by weight to 70 parts by weight, 1 part by weight to 60 parts by weight, 1 part by weight to 50 parts by weight, 1 part by weight to 30 parts by weight or 1 part by weight to 20 parts by weight . Within this range, the mixing effect of the multifunctional and monofunctional polymerizable liquid crystal compound can be maximized. Unless specifically stated otherwise herein, unit weight parts can mean weight ratios.

In one example, the difference between the refractive index in the in-plane slow axis direction and the refractive index in the in-plane fast axis direction may be in the range of 0.05 to 0.2, 0.07 to 0.2, 0.09 to 0.2, or 0.1 to 0.2 in the liquid crystal layer. The refractive index in the in-plane slow axis direction means the refractive index in the direction showing the highest refractive index in the plane of the liquid crystal layer and the refractive index in the fast axis direction is the refractive index in the direction showing the lowest refractive index on the plane of the liquid crystal layer It can mean. In general, in the optically anisotropic liquid crystal layer, the fast axis and the slow axis are formed in directions perpendicular to each other. Each of the refractive indices may be a refractive index measured with respect to light having a wavelength of 550 nm or 589 nm. The liquid crystal layer may also have a thickness of about 0.5 占 퐉 to 2.0 占 퐉 or about 0.5 占 퐉 to 1.5 占 퐉.

The liquid crystal layer having the relationship of the refractive index and the thickness can realize the phase delay characteristic suitable for the application to which it is applied. In one example, the liquid crystal layer having the refractive index relationship and thickness may be suitable for an optical filter for light division, for example, an optical filter for stereoscopic image implementation.

The optical filter may further comprise a substrate layer. In this case, the alignment layer may be formed on the base layer, for example.

As the base layer, for example, a glass base layer such as a glass film or a sheet or a plastic base layer such as a plastic film or a sheet may be used. The substrate layer can be a light-transmitting substrate layer, and can have a transmittance of about 80% or more or about 85% or more, for example, in the visible light region.

Examples of the plastic substrate layer include a TAC (triacetyl cellulose) base layer; A COP (cyclo olefin polymer) base layer such as a norbornene derivative; A polyacetaldehyde (PVA) base layer, a poly (methyl methacrylate) base layer, a polycarbonate base layer, a polyethylene base layer, a polypropylene base layer, A polyether sulfone (PES) base layer, a polyetheretherketone (PEEK) base layer, a polyetherimide base layer, a polyethylenenaphthalate base layer, a polyethyleneterephthalate base layer, a polyimide base layer, polysulfone base layer, PVA (polyvinylalcohol) base layer, PAR (polyarylate) base layer, or amorphous fluororesin base layer.

The present application also relates to a method of manufacturing an optical filter. An exemplary manufacturing method may include forming a liquid crystal layer by applying a liquid crystal composition containing a liquid crystal compound on an alignment layer. In this case, the alignment layer is an alignment layer formed by the projections described above, and the application of the liquid crystal composition can be performed on the uneven surface of the alignment layer. For the liquid crystal layer formed by such a method, the matters described in the items of the optical filter can be applied equally. On the other hand, the shape, width, height or pitch of the convex portion of the alignment layer, the pattern of the convex portion and the concave portion, and the like can be similarly applied.

The method of forming the alignment layer in the above method is not particularly limited. For example, the orientation layer can be formed by contacting the above-mentioned layer with a mold capable of transferring the desired irregularities after forming the uncured, cured or semi-cured layer of the curable resin composition described above. When the layer of the resin composition is in an uncured or semi-cured state, the layer can be cured in contact with the mold.

The layer of the resin composition can be formed, for example, by applying a resin composition and curing or semi-curing if necessary. The resin composition can be produced, for example, by dissolving the above-described polymer or a monomer or oligomer capable of forming the polymer in a suitable solvent. As the solvent, an ether solvent, an aromatic solvent, a halogen solvent, an olefin solvent or a ketone solvent can be used, but the present invention is not limited thereto.

The resin composition can be applied, for example, on the above-described base material layer. The method of applying the resin composition is not particularly limited and may be applied by a conventional method such as bar coating, comma coating, or spin coating.

Fig. 8 shows an exemplary method of forming an orientation layer. For example, as shown in Fig. 8, the layer 200 of the resin composition can be brought into contact with the mold 500 capable of transferring the desired unevenness to form the orientation layer. Thus, irregularities having a shape in which the concave-convex structure of the mold 500 is inverted can be formed in the resin layer 200. The layer 200 of the resin composition may be cured or semi-cured at a point at which the concavities and convexities of the mold 500 can be appropriately transferred, for example, before contact with the mold, in contact with the mold, . The method of curing the layer 200 of the resin composition is not particularly limited, and a method such as thermal curing, photo-curing or hybrid curing may be used in view of the kind of the resin composition used.

After the orientation layer having irregularities is produced, a liquid crystal composition can be applied to form a liquid crystal layer. The liquid crystal composition can be produced, for example, by dissolving the liquid crystal compound described above in a suitable solvent. Examples of the solvent include halogenated hydrocarbons such as chloroform, tetrachloroethane, trichlorethylene, tetrachlorethylene and chlorobenzene; Aromatic hydrocarbons such as benzene, toluene, xylene, mesitylene, cymene, methoxybenzene and 1,2-dimethoxybenzene; Ketones such as acetone, methyl ethyl ketone, cyclohexanone or cyclopentanone; Alcohols such as isopropyl alcohol or n-butanol; A solvent such as methyl cellosolve, ethyl cellosolve, or butyl cellosolve may be used, but is not limited thereto.

The liquid crystal composition may include a radical or a cation initiator as an initiator for initiating polymerization of the polymerizable liquid crystal compound when necessary. The proportion of initiator in the composition is not limited so long as it can induce an appropriate degree of polymerization. For example, the initiator may be in an amount of 3 to 10 parts by weight based on 100 parts by weight of the polymerizable liquid crystal compound, but is not limited thereto.

When necessary, the liquid crystal composition may further contain a chiral agent, a surfactant, a polymerizable non-liquid crystalline compound, or a non-polymerizable liquid crystal compound.

After the application of the liquid crystal composition, if necessary, the solvent may be removed through a drying process or the like. Further, the liquid crystal layer can be formed, for example, by aligning and / or polymerizing a liquid crystal compound. The conditions such as the drying, orientation and / or polymerization process are not particularly limited, and can be carried out in the same manner as the conventional liquid crystal layer formation method known in the art.

The manufacturing method may be, for example, a continuous process. For example, the method may be performed in a roll-to-roll process. Fig. 9 is a view showing an exemplary process of forming an optical filter by a roll-to-roll process.

As shown in Fig. 9, the manufacturing process of the roll-to-roll type optical filter can be performed while continuously transporting the base layer 100 using rolls 60 such as winding rolls and wind-up rolls. The resin composition layer 200 is formed by applying the resin composition to the application device 20 while moving the base layer 100 and is contacted with the mold 500 formed on the rotating roll 50 An orientation layer can be formed. The liquid crystal composition may be continuously applied to the application device 30 to form a layer 300 of the liquid crystal composition and the liquid crystal layer may be formed by properly performing the above drying, orientation and / or polymerization processes.

The present application also relates to a display device, for example, a stereoscopic image display device. An exemplary display device may include a display element and an optical filter. The display device may include the optical filter described above as an optical filter.

The display device may include, for example, a sequentially arranged light source, a display element, and an optical filter. Accordingly, the light emitted from the light source enters the display element first, enters the optical filter via the display element, and can be emitted via the optical filter. For example, the observer wears polarizing glasses for observing the stereoscopic image, and can observe the light emitted from the optical filter. Specific types of display elements and light sources used in the display device are not particularly limited, and any known component used for manufacturing a stereoscopic image display device, for example, a stereoscopic image display device using polarizing glasses may be used .

In the display device, for example, the light source can emit light in the non-polarized state toward the display element in the driven state. The driving state of the term display device may refer to a state in which the display device is in operation and a state in which an image, for example, a stereoscopic image is displayed.

A polarizing plate may be disposed on both sides of the display element. In this specification, a polarizing plate disposed between a display element and a light source is referred to as a first polarizing plate, and a polarizing plate disposed between a display element and an optical filter can be referred to as a second polarizing plate. Accordingly, the light emitted from the light source can first enter the first polarizing plate, then enter the display element through the first polarizing plate, and the light emitted from the display element can enter the optical filter again through the second polarizing plate. The first and second polarizing plates may have, for example, a transmission axis and an absorption axis orthogonal to the transmission axis, respectively. Further, the transmission axes of the first and second polarizing plates may be arranged in different directions, for example, in directions perpendicular to each other, in the display device.

The display element may be, for example, a transmissive liquid crystal panel including a liquid crystal layer present between two substrates. The liquid crystal panel may include, for example, a first substrate, a liquid crystal layer, and a second substrate sequentially arranged from the light source side. An alignment layer for aligning the liquid crystal of the liquid crystal layer may be formed between the liquid crystal layer and the first and / or second substrate. The first substrate and / or the second substrate may be provided with pixel electrodes and / Or a common electrode may be formed. As the liquid crystal panel, a liquid crystal panel of VA (Vertical Alignment), TN (Twisted Nematic), STN (Super Twisted Nematic) or IPS (In FLane Switching) mode can be used.

(Hereinafter referred to as a UR region) and a left eye signal (hereinafter, referred to as an L signal) capable of generating a right eye signal (hereinafter, referred to as an R signal) in a driving state (Hereinafter, referred to as a UL region) may be formed in the left eye. When the display element is the liquid crystal panel described above, the UR and UL regions may be formed by one or more unit pixels of the liquid crystal panel. For example, light linearly polarized through the above-mentioned first polarizing plate is incident on the liquid crystal panel, and the light transmitted through the UR region after being incident is emitted as an R signal, and the light transmitted through the UL region is emitted as an L signal .

The patterns of the UR and UL regions in the display element can be controlled according to the pattern shape of the optical filter. For example, one of the first and second regions of the optical filter is a region for adjusting the polarization state of the R signal, and the other region is a region for adjusting the polarization state of the L signal, Lt; / RTI > In this case, the UR region is arranged so that a signal emitted from the region can be incident on any one of the first and second regions, and the UL region is a region in which a signal emitted from the region is incident on the first and second regions The light can be incident on one of the other areas. That is, for example, the UR and UL regions may be formed in a stripe shape extending in a common direction in accordance with the arrangement of the first and second regions of the optical filter, or may be formed in a regular lattice shape, a shifted lattice shape, Can be arranged alternately adjacent to each other in a shape.

The light transmitted through the UR and UL regions of the display element can be incident on the first and second regions of the optical filter after passing through the second polarizing plate, for example. The incident light can be divided into two or more lights having different polarization states by the optical filter, for example, circularly polarized light or elliptically polarized light whose direction of rotation is opposite to each other.

In the optical filter, for example, an R signal emitted from a display element and passed through a second polarizer is incident on any one of the first and second regions, and is emitted from the display element to another region of the first and second regions And the L signal passing through the second polarizing plate may be incident thereon. The region where the R signal is incident is called a right eye signal polarization control region (hereinafter, referred to as FR region), and the region where the L signal is incident is called a left eye signal polarization control region .

For example, the observer can perceive the stereoscopic image by observing the R and L signals respectively emitted from the FR and FL regions through the polarizing glasses.

An exemplary optical filter may be a light splitting element, for example, a filter that splits incident light into two or more kinds of lights having different polarization states from each other. The optical filter can be used, for example, for realizing a stereoscopic image.

1 is a side view of an exemplary optical filter.
2 is a view showing an exemplary form of an orientation layer.
Figs. 3 to 7 show exemplary arrangements of convex and concave portions of the orientation layer.
8 and 9 are views showing an exemplary manufacturing process of the optical filter.

Hereinafter, the optical filter will be described in detail with reference to embodiments, but the scope of the optical filter is not limited by the embodiments shown below.

Hereinafter, physical properties in Examples were evaluated in the following manner.

1. Liquid crystal of optical filter Orientation  evaluation

The surface optical axis uniformity of the optical filter was measured using a Mueller matrix imaging polarimeter (Mullur Matrix Imaging Polarimeter, AxoStep ^TM (manufactured by Axomatrics)) according to the manufacturer's manual. Since the uniformity of the optical axis on the surface is 0 as the liquid crystal is uniformly aligned in the optical filter, the liquid crystal alignment property of the optical filter is evaluated by the uniformity of the surface optical axis.

Example  One

The resin composition was coated on one side of a TAC substrate layer (refractive index: 1.49, thickness: 80,000 nm) and dried in an oven at 80 DEG C for 2 minutes. As the resin composition, a solution of a polyurethane resin (trade name: MINS-MOL, manufacturer: Minutatech) was used.

Thereafter, the layer of the dried resin composition was brought into contact with a mold capable of transferring irregularities having a width of about 1 mu m, a pitch of about 2 mu m, and a height of about 0.19 mu m. The layer of the resin composition was partially cured by irradiating light of 200 mW / cm < ² > intensity for 10 seconds while the layer of the resin composition was in contact with the mold. Then, the mold was separated from the orientation layer and irradiated with ultraviolet light (such as high-pressure mercury) of 200 mW / cm ² intensity at the top of the resin composition layer for about 30 seconds to form an orientation layer. Subsequently, a liquid crystal layer was formed on the alignment layer. A liquid crystal composition comprising 100 parts by weight of a liquid crystal compound represented by the following formula (A), an appropriate amount of a photo initiator (Igacure 907) and 75 parts by weight of a toluene solvent was prepared as a liquid crystal composition. Subsequently, the alignment layer was coated with the liquid crystal composition to form a coating layer. Thereafter, the coated layer was dried at room temperature for about 2 minutes. The optical filter was prepared by orienting the liquid crystal composition at room temperature according to the orientation of the underlying alignment layer and then irradiating with ultraviolet light (300 mW / cm ² ) for about 10 seconds to form a liquid crystal layer.

(A)

Examples 2 to 26 and Comparative Examples 1 to 10

An optical filter was prepared in the same manner as in Example 1 except that a mold capable of transferring irregularities having the width, pitch and / or height shown in Table 1 below was brought into contact with the layer of the resin composition.

Table 1 shows the optical axis uniformity according to the unevenness of the optical filters of Examples 1 to 26 and Comparative Examples 1 to 10.

Height of convex portion The width of the orientation layer The pitch of the orientation layer Optical axis uniformity Example 1 0.19 탆 1 탆 2 탆 0.658 Example 2 0.19 탆 1 탆 3 탆 1.299 Example 3 0.19 탆 1 탆 4 탆 3.870 Example 4 0.19 탆 2 탆 4 탆 1.894 Example 5 0.19 탆 2 탆 6 탆 4.858 Example 6 0.19 탆 3 탆 6 탆 4.370 Example 7 0.32 탆 1 탆 2 탆 0.726 Example 8 0.32 탆 1 탆 3 탆 2.470 Example 9 0.32 탆 1 탆 4 탆 3.237 Example 10 0.32 탆 2 탆 4 탆 2.090 Example 11 0.32 탆 2 탆 6 탆 5.322 Example 12 0.32 탆 3 탆 6 탆 3.311 Example 13 0.40 탆 1 탆 2 탆 1.847 Example 14 0.40 탆 1 탆 3 탆 1.943 Example 15 0.40 탆 1 탆 4 탆 2.551 Example 16 0.40 탆 2 탆 4 탆 3.485 Example 17 0.40 탆 2 탆 6 탆 4.488 Example 18 0.40 탆 3 탆 6 탆 6.609 Example 19 0.66 탆 1 탆 2 탆 0.943 Example 20 0.66 탆 1 탆 3 탆 1.716 Example 21 0.66 탆 1 탆 4 탆 1.931 Example 22 0.66 탆 2 탆 4 탆 1.946 Example 23 0.66 탆 2 탆 6 탆 4.921 Example 24 0.66 탆 2 탆 8 탆 5.055 Example 25 0.66 탆 3 탆 6 탆 3.298 Example 26 0.66 탆 3 탆 9 탆 5.813 Comparative Example 1 0.19 탆 2 탆 8 탆 21.17 Comparative Example 2 0.19 탆 3 탆 9 탆 22.90 Comparative Example 3 0.19 탆 3 탆 12 탆 31.89 Comparative Example 4 0.32 탆 2 탆 8 탆 13.59 Comparative Example 5 0.32 탆 3 탆 9 탆 15.67 Comparative Example 6 0.32 탆 3 탆 12 탆 24.68 Comparative Example 7 0.40 탆 2 탆 8 탆 10.94 Comparative Example 8 0.40 탆 3 탆 9 탆 14.84 Comparative Example 9 0.40 탆 3 탆 12 탆 21.65 Comparative Example 10 0.66 탆 3 탆 12 탆 13.77

101: orientation layer
A, 1011: convex portion
102: liquid crystal layer
13: convex portion of the orientation layer
14: concave portion of the orientation layer
500: mold
B: concave portion of the mold
200: layer or orientation layer of resin composition
300: a layer of a liquid crystal composition or a liquid crystal layer
20, 30: Apparatus for applying a resin composition or a liquid crystal composition
51, 60: Roll
100: substrate layer

Claims (13)

A width of 0.5 mu m to 3.5 mu m, a pitch of 0.7 mu m to 6.5 mu m and a height of 0.1 mu m to 0.6 mu m or a width of 0.5 mu m to 3.5 mu m, a pitch of 1.5 mu m to 9.5 mu m, and a height of 0.6 mu m to 1.2 mu m And a liquid crystal compound formed on the unevenness of the alignment layer, the liquid crystal compound being oriented by the unevenness of the alignment layer formed by the convex portions having the width, the pitch and the height And a liquid crystal layer including first and second regions having different phase delay characteristics, the first and second regions being formed in a direction in which the optical axes are different from each other with a quarter wavelength layer, And the second region are formed so that the linearly polarized light can be divided into circularly polarized light or elliptically polarized light whose directions of rotation are opposite to each other when linearly polarized light is incident in the same direction, An optical filter that does not have a surface treated.
delete delete The optical filter according to claim 1, wherein the orientation layer is a resin layer comprising an acrylic compound, an epoxy compound, a urethane compound, a urethane acrylate compound, a phenol compound or a polyester compound.
The optical filter according to claim 1, wherein the convex portions formed in the orientation layer are formed to have a stripe shape extending parallel to each other.
The optical filter according to claim 1, wherein the convex portions formed in the orientation layer and the concave portions formed by the convex portions are alternately arranged in a lattice shape.
The optical filter according to claim 1, wherein the liquid crystal layer has a difference between a refraction index in an in-plane slow axis direction and a refraction index in a fast axis direction of 0.05 to 0.2 and a thickness of 0.5 to 2.0 μm.
The optical filter according to claim 1, further comprising a base layer, and an orientation layer formed on the base layer.
A width of 0.5 mu m to 3.5 mu m, a pitch of 0.7 mu m to 6.5 mu m and a height of 0.1 mu m to 0.6 mu m or a width of 0.5 mu m to 3.5 mu m, a pitch of 1.5 mu m to 9.5 mu m and a height of 0.6 mu m to 1.2 mu m A layer of a liquid crystal composition containing a liquid crystal compound is formed on the unevenness of the orientation layer including unevenness formed by convex portions of the liquid crystal composition and the surface of which is not rubbed by the convex portion having the width, Wherein the first and second regions are all quarter wavelength layers and the optical axes of the first and second regions are different from each other in a direction in which the optical axes are different from each other So that the linearly polarized light can be divided into the circularly polarized light or the elliptically polarized light whose directions of rotation are opposite to each other when the linearly polarized light is incident on the first and second regions in the same direction The method of an optical filter, which comprises forming a liquid crystal layer that is sex.
The manufacturing method of an optical filter according to claim 9, wherein the unevenness of the orientation layer is formed by bringing a layer of the resin composition into contact with a mold capable of transferring the unevenness.
The manufacturing method of an optical filter according to claim 9, wherein the formation of the alignment layer and the formation of the liquid crystal layer proceed by a roll-to-roll process.
A display device comprising a display element and the optical filter of claim 1.
13. The image display apparatus according to claim 12, wherein the display element is provided with right eye and left eye signal generating regions capable of generating signals for right eye and left eye respectively in a driving state, Wherein the right eye signal can be incident on an area where the right eye signal is incident and the left eye signal can be incident on another area.

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