WO2013022258A2 - Filtre optique - Google Patents

Filtre optique Download PDF

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Publication number
WO2013022258A2
WO2013022258A2 PCT/KR2012/006262 KR2012006262W WO2013022258A2 WO 2013022258 A2 WO2013022258 A2 WO 2013022258A2 KR 2012006262 W KR2012006262 W KR 2012006262W WO 2013022258 A2 WO2013022258 A2 WO 2013022258A2
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WO
WIPO (PCT)
Prior art keywords
region
optical filter
regions
light
liquid crystal
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Ceased
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PCT/KR2012/006262
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English (en)
Korean (ko)
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WO2013022258A3 (fr
Inventor
박문수
전병건
김상섭
홍경기
고동호
허두영
유수영
이승룡
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LG Chem Ltd
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LG Chem Ltd
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Priority claimed from KR1020120085820A external-priority patent/KR101472180B1/ko
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Priority to JP2014524926A priority Critical patent/JP5928755B2/ja
Priority to CN201280038894.2A priority patent/CN103874954B/zh
Publication of WO2013022258A2 publication Critical patent/WO2013022258A2/fr
Publication of WO2013022258A3 publication Critical patent/WO2013022258A3/fr
Priority to US14/172,460 priority patent/US9285524B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another

Definitions

  • the present application relates to an optical filter and a stereoscopic image display device.
  • the stereoscopic image display device is a display device capable of displaying an image having a sense of depth. Since the three-dimensional image display device can display the object in three dimensions in space, the three-dimensional information of the object can be completely transmitted to the viewer, and realistic expression is possible.
  • Stereoscopic image display technology is largely divided into a glasses method and a glasses-free method.
  • the glasses method may be classified into polarized glasses method and liquid crystal shutter glass method, and the glassesless method may be classified into a binocular / multi-view binocular parallax method, a volume method, or a holographic method. have.
  • the present application provides an optical filter and a stereoscopic image display device.
  • the exemplary optical filter may include a first region and a second region having different phase delay characteristics from each other, and may further include a third region having a phase delay characteristic different from the first and second regions or having a scattering function.
  • the phase delay characteristics between the regions are different from each other means that each region is formed in the same or different directions and has a phase delay value in a state where the target regions are all regions having phase delay characteristics. Are also areas different from each other; And an optical axis having the same phase retardation value and being formed in different directions.
  • “different phase delay characteristics between regions” means that any one region of the target regions has a phase delay characteristic, and the other region has no phase delay characteristic, for example, optically isotropic. The case may also be included.
  • the first and second regions have different phase retardation characteristics, so that, for example, when linearly polarized light is incident, the first and second regions may be divided into two types of light in which polarization axes are substantially perpendicular to each other, or linearly polarized light.
  • the incident light When the incident light is incident, the light may be divided into circularly polarized light in which the directions of rotation are opposite to each other or elliptical polarization in which the directions of rotation are opposite to each other.
  • the optical filter may be, for example, an optical filter for a stereoscopic image display device applied to a stereoscopic image display device.
  • the stereoscopic image display apparatus may include a light source 4, a display element 2, and an optical filter 1 as shown in FIG. 2.
  • the display device is a polarized glasses type
  • the observer may wear polarized glasses and observe a stereoscopic image output from the display device.
  • the light source 4 can, for example, emit light in a non-polarized state toward the display element 2 in the driving state.
  • drive state of the term display device is a state in which the display device is operating and may mean a state in which an image, for example, a stereoscopic image is displayed.
  • Polarizing plates 3A and 3B may be disposed on both sides of the display element 2.
  • the polarizing plate 3A disposed between the display element 2 and the light source 4 is referred to as a first polarizing plate
  • the polarizing plate disposed between the display element 2 and the optical filter 1 ( 3B) may be referred to as a second polarizing plate.
  • the first and second polarizing plates 3A and 3B may have, for example, a transmission axis and an absorption axis orthogonal to the transmission axis.
  • the transmission axes of the first and second polarizing plates may be disposed in the display device in directions different from each other, for example, directions perpendicular to each other.
  • the display element 2 may be a transmissive liquid crystal panel including a liquid crystal layer existing between two substrates.
  • the liquid crystal panel includes, for example, a first substrate 24, a pixel electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a common electrode, and a second substrate 25 sequentially disposed from the light source 4 side. can do.
  • an active driving circuit including a TFT (Thin Film Transistor), wiring, and the like may be formed on the first substrate as a driving element electrically connected to the transparent pixel electrode.
  • the pixel electrode contains a metal oxide such as indium tin oxide (ITO), for example, and can function as an electrode for each pixel.
  • ITO indium tin oxide
  • the first or second alignment layer may serve to orient the liquid crystal of the liquid crystal layer, for example.
  • the liquid crystal layer may include, for example, liquid crystal in a vertical alignment (VA), twisted nematic (TN), super twisted nematic (STN), or in flan switching (IPS) mode.
  • VA vertical alignment
  • TN twisted nematic
  • STN super twisted nematic
  • IPS in flan switching
  • the liquid crystal layer may have a function of transmitting or blocking light from the light source 4 for each pixel by a voltage applied from the driving circuit.
  • the common electrode can function as a common counter electrode, for example.
  • the display element 2 includes a right eye signal generation region (hereinafter referred to as an “UR region”) 21 and a left eye signal (hereinafter referred to as “R signal”) capable of generating a right eye signal (hereinafter referred to as an “R signal”) in a driving state.
  • a left eye signal generation region (hereinafter referred to as an "UL region” 22) capable of generating an "L signal”
  • UR and UL regions 21 and 22 each including one or more pixels. ) May be formed.
  • one or more unit pixels including a liquid crystal sealed between the first and second alignment layers in the liquid crystal panel may form an UR or UL region.
  • UR and UL regions may be arranged in the row and / or column direction.
  • the UR and UL regions may be alternately arranged adjacent to each other while having a stripe shape extending in a common direction as shown in FIG. 3.
  • the UR and UL regions may be alternately disposed adjacent to each other in a grid pattern as shown in FIG. 4.
  • the exemplary display element may also include a light transmittance adjusting region (hereinafter referred to as a “TC region”) adjacent to the UR and UL regions (23 in FIG. 2).
  • TC region may refer to a region formed to block incident light or to absorb a portion of incident light and to transmit only a portion of the incident light.
  • the TC region may mean, for example, a region in which the transmittance of incident light, that is, the light transmittance is 0% to 20%, 0% to 15%, 0% to 10%, or 0% to 5%.
  • the TC region can be, for example, a black matrix.
  • the TC region may be a black matrix included in a color filter typically present on a second substrate that may be included in the liquid crystal panel as described above.
  • the TC region may be a resin layer or graphite including pigments such as chromium (Cr), a two-layered film of chromium and chromium oxide (Cr / CrOx two-layered film), carbon black, carbon pigment, and the like. It may be an area including a graphite.
  • the manner of forming the TC region using the material is not particularly limited.
  • the TC region may be formed by photolithography, a lift off method, or the like, which is a conventional method of forming a black matrix.
  • the TC region adjacent to the UR and UL region is a process in which the R signal and / or L signal generated in the UR and / or UL region are transmitted to the optical filter when observing an image from at least one angle within the viewing angle range. At least a portion of the R and / or L signal is incident to the TC region so that a signal incident to the TC region is blocked by the TC region or only a portion of the signal incident to the TC region is transmitted through the TC region to the optical filter. This may mean that the TC region exists at the position to allow the access.
  • the TC region may be formed between the UR and UL regions as illustrated in FIG. 5.
  • the TC region may be formed between the UR and UL regions as illustrated in FIG. 6.
  • viewing angle means that, for example, the L signal generated in the UL region passes through the left polarized signal polarization adjusting region (hereinafter referred to as "FL region") of the optical filter, and the right polarized signal polarization adjusting region (hereinafter referred to as " FR region ”) is a range of angles that can be transmitted to the viewer without being transmitted or an R signal generated in the UR region can be transmitted to the viewer without passing through the FR region of the optical filter, It can mean a range of angles.
  • FR region right polarized signal polarization adjusting region
  • the FR and FL regions are regions of the optical filter which can emit light by controlling the polarization states of the R and L signals differently, for example, if the optical filter is applied to the display device, the first and second regions Either region may serve as the FR region and the other region may serve as the FL region.
  • the TC region adjacent to the UR and UL region may be located between the UR and UL region.
  • the TC region exists between the UR and UL regions include the case where the UR, TC and UL regions are sequentially located on the same plane, or in the front or rear of the plane in which the UR and UL regions are located. If it is located and the like can be exemplified. If the TC area is located on the front or the back of the plane in which the UR and UL areas are located, the TC area may exist in an overlapping state with at least a portion of the UR and / or UL area when the device is viewed from the front. have.
  • the R signal is obtained.
  • the linearly polarized light is transmitted through the UL region 22 of the display element 2, Can be an L signal.
  • the second polarizing plate 3B may transmit only light linearly polarized in parallel with the transmission axis of the second polarizing plate 3B.
  • the optical filter 1 comprises two or more kinds of light having different polarization states, for example, two kinds of linearly polarized light in the directions perpendicular to each other described above, or circularly polarized light in which the directions of rotation are opposite to each other. It can be split into elliptical polarized light.
  • the optical filter may be disposed such that an R signal passing through the second polarizing plate 3B may be incident to the FR region, and an L signal passing through the second polarizing plate 3B may be incident to the FL region.
  • the R and L signals incident on the FR and FL regions of the optical filter are respectively converted to different polarization states, and are emitted.
  • the observer can recognize a stereoscopic image by wearing polarized glasses and observing the signal.
  • the optical filter may include, for example, a polarization control layer.
  • the above-described first to third regions may be formed in the polarization control layer.
  • the first and second regions may be formed in a stripe shape extending in a common direction, and may be alternately arranged adjacent to each other.
  • 7 exemplarily shows the first region 11 and the second region 12 arranged as described above.
  • the first and second regions 11 and 12 may be alternately arranged adjacent to each other in a grid pattern, for example.
  • the third region may be located at a boundary between the first and second regions arranged as described above.
  • FIG. 9 is a view again showing the arrangement of the first and second regions described above in consideration of the existence of the third region 13 in the state as shown in FIG. 7.
  • FIG. 10 is a view again showing the arrangement of the first and second regions described above in consideration of the existence of the third region 13 in the state as shown in FIG. 8.
  • the linearly polarized light when the linearly polarized light passes through the first and second regions, respectively, the linearly polarized light may be emitted as light that is linearly polarized in a direction substantially perpendicular to each other.
  • the linearly polarized light transmits through the first and second regions, respectively, one of the light transmitted through the first region and the light transmitted through the second region is in a state of left circularly polarized circular or elliptical polarization, and the other One light can be emitted in the state of circularly polarized circularly or elliptically polarized light.
  • at least one of the first and second regions may include a retardation layer.
  • both the first and second regions include a phase difference layer, and the phase difference layer included in the first region and the phase difference layer included in the second region.
  • the case of this quarter wavelength layer can be illustrated.
  • the optical axes of the quarter-wave layer arranged in the first region and the quarter-axis layer arranged in the second region are formed differently from each other. There may be.
  • the first region includes a quarter wave layer having an optical axis in a first direction as the phase difference layer
  • the second region has a optical axis in a second direction different from the first direction as the phase difference layer. It may include four wavelength layers.
  • n wavelength layer may refer to a phase delay device capable of delaying phase of incident light by n times the wavelength, where n is, for example, 1/2, 1 / 4 or 3/4.
  • optical axis in the present specification may mean a slow axis or a fast axis in the process of transmitting light through the region, for example, may mean a slow axis.
  • first and second regions are not limited to such aspects.
  • one of the first and second regions may generate left and right polarized light even when the third region includes three quarter wavelength layers and the other region includes quarter wavelength layers.
  • any one of the first and second regions may be a 1/2 wavelength layer, and the other region may be an optically isotropic region.
  • the R and L signals passing through the first and second regions, respectively can be emitted from the optical filter in the form of linearly polarized light so as to have a polarization axis in a direction substantially perpendicular to each other.
  • the wavelength layer forming the polarization control layer for example, the first and / or second region and the third region in some cases, may be a liquid crystal layer.
  • the liquid crystal compound which is oriented and exhibits phase retardation characteristics can be oriented and polymerized if necessary to form the first and / or second region.
  • the liquid crystal layer may contain, for example, a polymerizable liquid crystal compound.
  • the liquid crystal layer may include a polymerizable liquid crystal compound in a polymerized form.
  • the term "polymerizable liquid crystal compound” may mean a compound containing a site capable of exhibiting liquid crystallinity, for example, a mesogen skeleton, and the like, and further including at least one polymerizable functional group.
  • the polymerizable liquid crystal compound is included in a polymerized form may mean a state in which the liquid crystal compound is polymerized to form a skeleton such as a main chain or side chain of the liquid crystal polymer in the liquid crystal layer.
  • the liquid crystal layer may further contain a polymerizable liquid crystal compound in a non-polymerized state, or may further include a known additive such as a polymerizable non-liquid crystal compound, a stabilizer, a non-polymerizable non-liquid crystal compound, or an initiator.
  • the polymerizable liquid crystal compound included in the liquid crystal layer may include a polyfunctional polymerizable liquid crystal compound and a monofunctional polymerizable liquid crystal compound.
  • polyfunctional polymerizable liquid crystal compound may mean a compound containing two or more polymerizable functional groups in the liquid crystal compound.
  • the multifunctional polymerizable liquid crystal compound has 2 to 10, 2 to 8, 2 to 6, 2 to 5, 2 to 4, 2 to 3 polymerizable functional groups Or two.
  • the term “monofunctional polymerizable liquid crystal compound” can mean the compound containing one polymerizable functional group among the said liquid crystal compounds.
  • the liquid crystal layer is a monofunctional polymerizable liquid crystal compound, more than 0 parts by weight to 100 parts by weight, 1 part by weight to 90 parts by weight, 1 part by weight to 80 parts by weight, 1 part by weight relative to 100 parts by weight of the polyfunctional polymerizable liquid crystal compound.
  • To 70 parts by weight 1 to 60 parts by weight, 1 to 50 parts by weight, 1 to 30 parts by weight or 1 to 20 parts by weight.
  • the mixing effect of the polyfunctional and monofunctional polymerizable liquid crystal compounds can be maximized, and the desired phase retardation value and the optical axis can be stably maintained.
  • the unit "parts by weight” may mean a ratio of weight.
  • the multifunctional or monofunctional polymerizable liquid crystal compound may be a compound represented by the following Chemical Formula 1.
  • A is a single bond, -COO- or -OCO-
  • R 1 to R 10 are each independently hydrogen, halogen, alkyl group, alkoxy group, alkoxycarbonyl group, cyano group, nitro group, -OQP or A substituent of Formula 2 or a pair of two adjacent substituents of R 1 to R 5 or a pair of two adjacent substituents of R 6 to R 10 are connected to each other to form a benzene substituted with -OQP, wherein R 1 to At least one of R 10 is -OQP or a substituent of Formula 2 below, or at least one pair of two adjacent substituents of R 1 to R 5 or two adjacent substituents of R 6 to R 10 are connected to each other to form -OQP Form benzene substituted with Q, wherein Q is an alkylene group or an alkylidene group, and P is an alkenyl group, epoxy group, cyano group, carboxyl group, acryloyl group
  • B is a single bond, -COO- or -OCO-
  • R 11 to R 15 are each independently hydrogen, halogen, alkyl group, alkoxy group, alkoxycarbonyl group, cyano group, nitro group or -OQP, or A pair of adjacent two substituents of R 11 to R 15 are connected to each other to form a benzene substituted with -OQP, wherein at least one of R 11 to R 15 is -OQP or two adjacent ones of R 11 to R 15 The pair of substituents are connected to each other to form benzene substituted with -OQP, wherein Q is an alkylene group or an alkylidene group, and P is an alkenyl group, epoxy group, cyano group, carboxyl group, acryloyl group, methacrylo It is a polymerizable functional group, such as a diary, acryloyloxy group, or methacryloyloxy group.
  • two adjacent substituents may be linked to each other to form a benzene substituted with -OQP, which may mean that two adjacent substituents are connected to each other to form a naphthalene skeleton substituted with -OQP as a whole. .
  • single bond means a case where no separate atom is present in the moiety represented by A or B.
  • A is a single bond in Formula 1
  • benzene on both sides of A may be directly connected to form a biphenyl structure.
  • halogen in the formula (1) and (2) for example, chlorine, bromine or iodine and the like can be exemplified.
  • alkyl group includes, for example, a straight or branched chain alkyl 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. It may mean, or may mean, for example, a cycloalkyl group having 3 to 20 carbon atoms, 3 to 16 carbon atoms, or 4 to 12 carbon atoms.
  • the alkyl group may be optionally substituted by one or more substituents.
  • alkoxy group may mean, for example, 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. Can be.
  • the alkoxy group may be linear, branched or cyclic. In addition, the alkoxy group may be optionally substituted by one or more substituents.
  • alkylene group or "alkylidene group” is, for example, unless otherwise specified, for example, an alkylene group or an alkylidene group having 1 to 12 carbon atoms, 4 to 10 carbon atoms or 6 to 9 carbon atoms. Can mean.
  • the alkylene group or alkylidene group may be, for example, linear, branched or cyclic.
  • the alkylene group or alkylidene group may be optionally substituted by one or more substituents.
  • alkenyl group means, for example, 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. Can be.
  • the alkenyl group may be, for example, linear, branched or cyclic.
  • the alkenyl group may be optionally substituted by one or more substituents.
  • P may be, for example, acryloyl group, methacryloyl group, acryloyloxy group or methacryloyloxy group, may be acryloyloxy group or methacryloyloxy group, and in another example It may be an acryloyloxy group.
  • an alkyl group, an alkoxy group, an alkenyl group, an epoxy group, an oxo group, an oxetanyl group, a thiol group, a cyano group, a carboxyl group, acryloyl group, a methacryloyl group, Acryloyloxy group, methacryloyloxy group or an aryl group may be exemplified, but is not limited thereto.
  • At least one of -OQP or a residue of formula (2), which may be present in Formulas (1) and (2), may, for example, be present at a position of R 3 , R 8, or R 13 .
  • the substituents connected to each other to constitute benzene substituted with -OQP may be, for example, R 3 and R 4 or R 12 and R 13 .
  • substituents other than -OQP or residues of the formula (2) or substituents other than the substituents connected to each other to form benzene in the compound of the formula (1) or the formula (2) for example, hydrogen, halogen, straight chain of 1 to 4 carbon atoms Or an alkoxycarbonyl group including a branched alkyl group, a straight or branched alkoxy 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, a cyano group or a nitro group, and in another example Alkoxycarbonyl group or cyano group including chlorine, a straight or branched chain 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, a straight or branched chain alkoxy group having 1 to 4 carbon atoms Can be.
  • the polymerizable liquid crystal compound may be included in the liquid crystal layer in a horizontally aligned state.
  • the compound may be polymerized in a horizontal alignment state and included in the liquid crystal layer.
  • horizontal alignment means that the optical axis of the liquid crystal layer containing the liquid crystal compound is about 0 degrees to about 25 degrees, about 0 degrees to about 15 degrees, about 0 degrees to about 10 degrees, with respect to the plane of the liquid crystal layer, It may mean a case having an inclination angle of about 0 degrees to about 5 degrees or about 0 degrees.
  • the liquid crystal layer of the polarization control layer for example, the first and / or second region, has a difference between the refractive index in the in-plane slow axis direction and the refractive index in the in-plane fast axis direction 0.05 to 0.2, 0.07 to 0.2, 0.09 to 0.2 or 0.1 to 0.2.
  • the refractive index in the in-plane slow axis direction refers to the refractive index in the direction showing the highest refractive index in the plane of the liquid crystal layer
  • the refractive index in the fast axis direction refers to the refractive index in the direction showing the lowest refractive index on the plane of the liquid crystal layer. Can be.
  • the fast axis and the slow axis are formed in a direction perpendicular to each other.
  • Each of the refractive indices may be a refractive index measured for light having a wavelength of 550 nm or 589 nm. The difference in refractive index can be measured according to the manufacturer's manual, for example, using Axoscan, Axoscan.
  • the liquid crystal layer may also have a thickness of about 0.5 ⁇ m to 2.0 ⁇ m or about 0.5 ⁇ m to 1.5 ⁇ m.
  • the liquid crystal layer having the relationship and thickness of the refractive index may implement a phase delay characteristic suitable for the application to be applied. In one example, the liquid crystal layer having a relationship between the refractive index and the thickness may be suitable for an optical element for splitting light.
  • the third region which may exist at the boundary between the first and second regions, is, for example, a region having a phase delay characteristic different from that of the first and second regions, or a region having no phase delay characteristic or having a scattering function. It may be an area.
  • the third region may emit the linearly polarized light or the non-polarized light.
  • the third region emits linearly polarized light in a linearly polarized state, for example, when the first and second regions generate linearly polarized light in a direction substantially perpendicular to each other, the linearly polarized light is linearly polarized in the direction perpendicular to each other.
  • the light can be emitted as light linearly polarized in a third direction different from the polarization axis of the light.
  • the light emitted from the third region is 30% or more, 30 to 80%, 30 to 75%, 30 to 70%, 30 to 65%, 30 to 30 compared to the light emitted from the first or second region. 60%, 30-55%, 35-80%, 40-80%, 45-80%, 35-75%, 35-70%, 40-65%, 40-60%, 45-55% or about 50
  • the polarized glasses can be transmitted at a reduced rate by about%.
  • the third region may be, for example, an isotropic region, a phase delay region or a light scattering region.
  • a polarization control layer such as a liquid crystal layer is present only in a region corresponding to the first and / or second region, or in a region corresponding to the third region, glass or an isotropic substance is present. The case may be illustrated.
  • the third region may be a liquid crystal layer as described above.
  • all of the first to third regions may be liquid crystal layers.
  • the first region has an optical axis formed in the first direction
  • the second region has an optical axis formed in the second direction that is the same as or different from the first direction
  • the third region has the first and It may be an area having an optical axis in a third direction different from the second direction.
  • the first and second directions may be different and perpendicular to each other.
  • the first and second directions may be different from each other, and the third direction may be formed in a direction substantially parallel to or perpendicular to a line bisecting an angle formed by the first and second directions. That is, the third direction may satisfy the condition of the following general formula (1).
  • A is an angle formed by the virtual straight line measured in a clockwise direction from a virtual straight line of the optical filter plane and a third direction
  • R is the virtual straight line measured clockwise from the virtual straight line.
  • a straight line and the first direction are angles formed
  • L is an angle between the imaginary straight line and the second direction measured clockwise from the imaginary straight line.
  • the virtual straight line may be in a direction parallel to the light absorption axis of the polarizer of the display device, for example, the second polarizer.
  • the method for causing the third region to have such an optical axis is not particularly limited.
  • the third region as described above may be formed.
  • the phase difference of the third region is not particularly limited as long as it has the optical axis as described above.
  • the phase difference of the third region may be the same as that of the first and / or second region in consideration of fairness.
  • the scattering material may exist in a portion corresponding to the third region.
  • an unoriented liquid crystal compound may be exemplified. That is, the first and / or second region in the optical filter may be an oriented liquid crystal region as described above, and the third region may be an unoriented liquid crystal region.
  • Such a third region may be formed by not aligning the liquid crystal compound of a portion corresponding to the third region in the alignment process of the liquid crystal described later.
  • the optical filter may further include a base layer.
  • the polarization control layer described above may be formed on the substrate layer, for example.
  • a base material layer a glass base material layer, a plastic film, a sheet, etc. can be used, for example.
  • a plastic film or sheet for example, a film or sheet having a transmittance of about 80% or more or about 85% or more for light in the visible light region may be used.
  • Films or sheets include triacetyl cellulose (TAC) films or sheets; Cyclo olefin polymer (COP) films or sheets such as norbornene derivatives; Poly (methyl methacrylate) film or sheet; polycarbonate (PC) film or sheet; polyethylene (PE) film or sheet; polypropylene (PP) film or sheet; polyvinyl alcohol (PVA) film or sheet; diacetyl cellulose (DAC) film Or a sheet; a polyacrylate (Pac) film or sheet; a poly ether sulfone (PES) film or sheet; a polyetheretherketone (PEEK) film or sheet; a polyetherimide (PEI) film or sheet; a polyethylenenaphthalate (PEN) film or sheet; a polyethyleneterephthalate (PET) film Or a sheet; a polyimide (PI) film or sheet; a polysulfone (PSF) film or sheet; a polyvinylalcohol (PVA) film or sheet;
  • the optical filter may further include an alignment layer between the base layer and the liquid crystal layer.
  • the alignment layer may be a layer that controls the optical axis of the liquid crystal layer by controlling the alignment direction in the alignment process of the liquid crystal layer.
  • a conventional alignment film known in the art can be used.
  • the orientation is determined by isomerization, fries rearrangement, or dimerization reaction induced by irradiation of linearly polarized light, and the alignment is performed on the adjacent liquid crystal layer by the determined orientation. Examples thereof include an inducible photo-alignment layer, a polymer layer such as a rubbed polyimide layer, or an acrylic curable resin layer in which a plurality of groove regions are patterned.
  • An optical filter can be manufactured by the method of forming an alignment layer on a base material layer, and forming a liquid crystal layer on the said alignment layer, for example.
  • the first to third regions may be formed by adjusting the formation region of the alignment layer or by adjusting the alignment direction.
  • the present application also relates to a display device, for example, a stereoscopic image display device.
  • the display device may include the optical filter.
  • the display device may include, for example, the display element and the optical filter including the UR and UL regions capable of generating R and L signals, respectively.
  • the display element may include the TC region described above.
  • the optical filter may be arranged such that in the driving state, the R signal is incident to one of the first and second regions, and the L signal is incident to the other of the first and second regions.
  • fills following formula 2 is all 3 degrees or more, 5 degrees or more, 8 degrees or more, for example. More than 8.5 degrees, more than 9 degrees, more than 9.5 degrees, more than 10 degrees, more than 10.5 degrees, more than 11 degrees, more than 11.5 degrees, more than 12 degrees, more than 12.5 degrees, more than 13 degrees, more than 13.5 degrees, more than 14 degrees, 14.5
  • the display device may be disposed on the display device while including the third area to be at least 15 degrees or more than 15 degrees.
  • H 1 is the width of the TC region
  • H 2 is the width of the third region
  • T is the distance from the TC region of the display element to the third region of the optical filter
  • y is the width of the TC region. The distance from the point where the imaginary normal to the surface of the TC region of the line bisecting the third region is in contact with the third region is present.
  • Equations 1 and 2 will be described below with reference to FIG. 11.
  • the L signal of the display element does not transmit through the first region 11, but the range of angle ⁇ U or R signal does not transmit through the second region 12.
  • the range of angles ⁇ L that can be transmitted to the viewer is determined by the distance T from the TC region 23 to the third region 13 and the width of the TC region 23 and the third region 13. Therefore, it can be seen that it is determined.
  • the distance T may be, for example, the distance from the surface where the TC region faces the optical filter to the surface facing the display element of the optical filter.
  • the distance T is determined according to the specification of the display device and is not particularly limited.
  • the distance T may be about 5 mm or less or about 0.5 mm to about 5 mm.
  • the widths of the UR, UL, and TC regions or the widths of the first to third regions may also be determined in an appropriate range according to the specifications of the display device.
  • the width of the first and second regions may be adjusted to about 50 to 1000 ⁇ m, about 50 to 750 ⁇ m, or about 100 to 500 ⁇ m. have.
  • the width of the third region can be adjusted to about 50 to 150 ⁇ m, about 50 to 120 ⁇ m or 70 to 120 ⁇ m. Accordingly, the widths of the UR, UL, and TC regions may be adjusted to equal widths in consideration of, for example, the widths of the first to third regions.
  • angles “ ⁇ U ” and “ ⁇ L ” represent the widths H 1 and H 2 of the TC and the third region and the relative positions of the TC and the third region when the distance T is the same. It can be seen that it is determined according to.
  • the angle " ⁇ U" is, tan ⁇ U is on the surface of the TC region or a display device of the line bisecting a width of 1/2 times the area of the TC value and the width (H 1) of the TC region from the point of the normal line (C) of virtual is in contact with the third region formed to be the equal to the value divided by the distance (y) the sum (H 1/2 + y) of the distance (T) of up to part of the present third area It can be seen that.
  • the angle " ⁇ L" is, bisecting the width (H 1) of the TC region tan ⁇ L in the width (H 2) of the third region to the value of one-half times the width (H 1) of the TC region.
  • H 1/2 + H 2 -y ) a it can be seen that is formed to be equal to the value divided by the distance (T).
  • a wide viewing angle can be obtained when the stereoscopic image is observed by appropriately adjusting the size of the TC and the third region, for example, the width and the relative positions of the TC and the third region. It can also ensure excellent luminance characteristics.
  • the display device is configured such that the maximum value of the angle " ⁇ U " and Equation 2 satisfying Equation 1 of 60%, 65% or 70% or more, and at the same time satisfying Equation 1 above.
  • the maximum value of the satisfying angle " ⁇ L " is 3 degrees or more, 5 degrees or more, 8 degrees or more, 8.5 degrees or more, 9 degrees or more, 9.5 degrees or more, 10 degrees or more, 10.5 degrees or more, 11 degrees or more, 11.5 degrees 12 degrees or more, 12.5 degrees or more, 13 degrees or more, 13.5 degrees or more, 14 degrees or more, 14.5 degrees or more, or 15 degrees or more.
  • relative luminance refers to luminance (I 0) in a display device including an optical filter in which the third region is not formed or an optical filter in which the third region is not formed and in which the TC region is not formed in the display element.
  • Ratio (I T / I) of the luminance I T in the display element including the optical filter having the third region formed thereon or the optical region having the third region formed therein and having the TC region formed thereon. O may mean.
  • An exemplary optical filter may be applied to, for example, a stereoscopic image display device, so that a stereoscopic image may be observed at a wide viewing angle without loss of luminance.
  • FIG. 1 schematically shows an exemplary optical filter.
  • FIG. 2 schematically illustrates an exemplary display device.
  • 3 and 4 show exemplary display elements that do not include a TC region.
  • 5 and 6 show exemplary display elements including a TC region.
  • FIG. 7 and 8 show exemplary optical filters that do not include a third region.
  • FIG. 9 and 10 show an exemplary optical filter including a third region.
  • optical filter will be described with reference to Examples and Comparative Examples, but the scope of the optical filter is not limited to the following examples.
  • the composition for forming a photo-alignment layer was coated so that the thickness after drying was about 1,000 mm 3, and dried in an oven at 80 ° C. for 2 minutes.
  • the dried composition for forming an optical alignment layer was subjected to an alignment treatment, and an optical alignment layer including first to third alignment regions oriented in different directions was formed.
  • the alignment process was carried out through irradiation of linearly polarized light through a mask, and the composition for forming a photoalignment layer through a mask while moving the TAC substrate on which the photoalignment layer was formed at a speed of about 3 m / min.
  • the process of irradiating with linearly polarized ultraviolet (300 mW / cm 2 ) was repeated.
  • the alignment regions are alternately disposed adjacent to each other while having a stripe shape in which the first and second alignment regions extend in a common direction, and the third alignment regions are present between the first and second alignment regions.
  • the orientation directions of the first and second alignment regions are 45 degrees clockwise or counterclockwise with the extension direction of the third alignment region, respectively, and the third alignment region is parallel with the extension direction of the third alignment region. Orientated. Subsequently, a liquid crystal layer was formed on the alignment layer subjected to the alignment treatment.
  • the liquid crystal composition comprising 70 parts by weight of the polyfunctional polymerizable liquid crystal compound represented by the following formula (4) and 30 parts by weight of the monofunctional polymerizable liquid crystal compound represented by the following formula (5), comprising an appropriate amount of a photoinitiator
  • ultraviolet light 300 mW / cm 2
  • the widths of the first to third regions were about 350 ⁇ m, about 350 ⁇ m, and about 100 ⁇ m, respectively.
  • An apparatus including the optical filter 1 manufactured in Production Example 1 and having the structure as shown in FIG. 2 and including a transmissive liquid crystal panel was configured as the display element 2.
  • the UR and UL regions are arranged in the form as shown in FIG. 5, the TC region 23 is formed by the black matrix of the color filter of the liquid crystal panel, and the TC region is between the regions of the UR and UL. Panels that were formed to overlap with portions of the UR and UL regions were used.
  • the TC region was formed such that the TC region overlapped with the UR region and the UL region overlapped with each other.
  • regions 11, 12, and 13 of the optical filter 1 were made to be arrange
  • the distance between the TC and the third region (T in FIG. 11) was about 0.7 mm.
  • An optical filter was manufactured in the same manner as in Preparation Example 1, except that an optical filter was formed in which the first and second regions were each about 450 ⁇ m in width without forming a third region.
  • the display device was manufactured by the method.
  • Viewing angle is defined as the angle at which the crosstalk rate occurs at 7% or less.
  • the crosstalk rate was measured in the following manner. First, the polarizing glasses are positioned at the observation point of the display device. Thereafter, in the state in which the display device outputs the L signal, a luminance meter (SR-UL2 Spectrometer) is disposed on the back of the left and right eye lenses of the polarizing glasses, and the luminance in each case is measured. The luminance measured at the back of the left eye lens is the brightness of the bright state, and the luminance measured at the back of the lens for the right eye is the brightness of the dark state. After each luminance was measured, the ratio of the brightness of the dark state to the brightness of the bright state ([brightness of the dark state] / [brightness of the bright state]) was obtained, and this was defined as the crosstalk rate.
  • SR-UL2 Spectrometer luminance meter
  • the viewing angles measured while varying the width H1 of the TC region of the display element are as follows. It can be seen from Table 1 that the use of the optical filter has an effect of improving the viewing angle of about 3.3 to 3.5 degrees.
  • Table 1 TC area width (H 1 ) ( ⁇ m) Viewing angle of Comparative Example 1 (unit: degrees) Viewing angle of Example 1 in degrees 0 3.5 7.0 25 4.5 8.0 50 5.5 9.0 75 6.6 10.0 100 7.6 11.0 125 8.6 12.0 150 9.6 13.0 175 10.6 13.9 200 11.5 14.9 225 12.5 15.8 250 13.5 16.8

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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  • Liquid Crystal (AREA)

Abstract

L'invention porte sur un filtre optique et sur un dispositif d'affichage stéréoscopique. Un filtre optique d'exemple selon l'invention concerne un dispositif d'affichage stéréoscopique permettant l'observation d'images stéréoscopiques dans un angle de visualisation large sans perte de luminosité.
PCT/KR2012/006262 2011-08-09 2012-08-07 Filtre optique Ceased WO2013022258A2 (fr)

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JP2014524926A JP5928755B2 (ja) 2011-08-09 2012-08-07 光学フィルタ
CN201280038894.2A CN103874954B (zh) 2011-08-09 2012-08-07 滤光片
US14/172,460 US9285524B2 (en) 2011-08-09 2014-02-04 Optical filter

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KR10-2011-0078990 2011-08-09
KR20110078990 2011-08-09
KR10-2012-0085820 2012-08-06
KR1020120085820A KR101472180B1 (ko) 2011-08-09 2012-08-06 광학 필터

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KR101086412B1 (ko) * 2005-04-04 2011-11-25 삼성전자주식회사 편광격자 스크린을 이용한 2차원/3차원 영상 호환용 입체영상 디스플레이 장치
JP4528333B2 (ja) * 2008-01-25 2010-08-18 株式会社有沢製作所 立体画像表示装置およびその製造方法
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