WO2015050374A1 - 광학 필름 - Google Patents
광학 필름 Download PDFInfo
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- WO2015050374A1 WO2015050374A1 PCT/KR2014/009256 KR2014009256W WO2015050374A1 WO 2015050374 A1 WO2015050374 A1 WO 2015050374A1 KR 2014009256 W KR2014009256 W KR 2014009256W WO 2015050374 A1 WO2015050374 A1 WO 2015050374A1
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- liquid crystal
- layer
- optical film
- negative biaxial
- biaxial retardation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
Definitions
- the present application relates to an optical film, a composite polarizing plate and a liquid crystal display device.
- a liquid crystal display which is a representative display device, has a liquid crystal cell containing liquid crystal molecules.
- the liquid crystal molecules included in the liquid crystal cell have birefringence, and the birefringence causes a difference in refractive index felt by the light depending on the position of the liquid crystal display.
- various retardation films such as optical compensation films that can be applied to liquid crystal displays have been proposed (for example, Patent Documents 1 and 2).
- Patent Document 1 Korea Patent Publication No. 2013-0101327
- Patent Document 2 Korea Patent Publication No. 2013-0003070
- the present application provides an optical film, a composite polarizing plate and a liquid crystal display.
- the present application is to provide an optical film or a composite polarizing plate that can be effectively applied to the optical compensation of various liquid crystal displays, in particular, so-called In plane switching (IPS) liquid crystal display and a liquid crystal display comprising the same.
- IPS In plane switching
- An exemplary optical film may include a negative biaxial retardation layer and a vertical alignment liquid crystal layer, and may include an isotropic layer having a difference in refractive index between the negative biaxial retardation film or the vertical alignment liquid crystal layer is 0.1 or more.
- the term refractive index or retardation in the present application means the refractive index or phase difference for light of a wavelength of 550 nm.
- the refractive index of the retardation layer or the liquid crystal layer in the difference between the refractive index of the isotropic layer and the negative biaxial retardation layer or vertically aligned liquid crystal layer the average refractive index, that is, the refractive index (Nx) in the slow axis direction described later
- the fast axis direction Means the average value ( ⁇ Nx + Ny + Nz ⁇ / 3) of the refractive index Ny and the refractive index Nz in the thickness direction.
- the term negative biaxial retardation layer is such that the refractive index Nx in the slow axis direction, the refractive index Ny in the fast axis direction and the refractive index Nz in the thickness direction satisfy the relationship of Nx> Ny> Nz. It may mean a retardation layer.
- the slow axis direction is the direction showing the highest refractive index on the plane of the retardation layer
- the fast axis direction is the direction perpendicular to the slow axis direction on the plane of the phase difference layer
- the thickness direction is perpendicular to the slow axis and the fast axis.
- the X-axis direction of the retardation layer 100 is the slow axis direction
- the Y-axis direction perpendicular thereto is the fast axis direction
- the Z-axis direction perpendicular to the X axis and the Y axis is the thickness direction.
- the term vertically aligned liquid crystal layer refers to a liquid crystal polymer layer including a liquid crystal that is substantially vertically aligned, and the polymer layer may exhibit characteristics of a so-called + C plate.
- the characteristics of the + C plate is that the refractive index Nx in the slow axis direction and the refractive index Ny in the fast axis direction are substantially the same, and the refractive index Nz in the thickness direction is equal to the refractive index Ny in the fast axis direction. Larger than that (Nz> Ny) may mean.
- the same refractive index Nx in the slow axis direction and the refractive index Ny in the fast axis direction are substantially the same, and therefore, there is a case where there is a minute difference caused by a process error or the like.
- the vertically oriented liquid crystal layer may also include some non-vertically oriented liquid crystals as long as they exhibit the properties of the + C plate.
- the term isotropic layer may mean a case in which the refractive index Nx in the slow axis direction, the refractive index Ny in the fast axis direction and the refractive index Nz in the thickness direction are all substantially the same.
- the same in the above is also substantially the same, and therefore, there is a case where there is a minute difference caused by the process error between the refractive indices and the like is also included in the same category.
- the vertically oriented liquid crystal layer may exist below the negative biaxial retardation layer.
- the isotropic layer may be present between the retardation layer and the liquid crystal layer, above the retardation layer, or under the liquid crystal layer.
- FIG. 2 and 3 are sectional views of an exemplary optical film, FIG. 2 is a case where an isotropic layer 30 exists between the retardation layer 10 and the liquid crystal layer 20, and FIG. 3 is a retardation layer 10. The case where the liquid crystal layer 20 and the isotropic layer 30 are sequentially present in the lower portion of the. Although not shown in the drawings, the isotropic layer 30 may be present on the retardation layer 10.
- the term upper or lower is a concept for setting the mutual positional relationship between layers included in the optical film or the composite polarizing plate such as the retardation layer, the liquid crystal layer, and the isotropic layer, and the layer must be the upper or lower part in the actual application process. It does not mean pointing in a direction.
- the retardation layer of such a structure can be usefully used as a compensation film of various liquid crystal displays, and in particular, minimizes light leakage occurring at the inclination angle of the black state of the so-called IPS liquid crystal display, secures a high contrast ratio, and It can be usefully used as a compensation film capable of suppressing color shift.
- the negative biaxial retardation layer included in the optical film may have an in-plane retardation (Rin) with respect to light having a wavelength of 550 nm in a range of 20 nm to 300 nm.
- the planar phase difference Rin is, in another example, about 25 nm or more, 30 nm or more, 35 nm or more, 40 nm or more, 45 nm or more, 50 nm or more, 55 nm or more, 60 nm or more, 65 nm or more, 70 nm or more , 80 nm or more, 90 nm or more, 100 nm or more, or 110 nm or more.
- planar phase difference Rin is, in another example, about 250 nm or less, about 240 nm or less, about 230 nm or less, about 220 nm or less, about 210 nm or less, about 200 nm or less, about 190 nm or less, about 180 nm Or about 170 nm or less, about 160 nm or less, about 150, about 140, or about 130 nm or less.
- the optical film can be applied to a liquid crystal display, particularly an IPS liquid crystal display, to effectively perform a desired function.
- the term plane phase difference may be calculated by the following Equation 1.
- Rin is the retardation in phase
- d is the thickness of the layer
- Nx is the refractive index in the slow axis direction of the layer (550 nm wavelength)
- Ny is the refractive index in the fast axis direction of the layer (550 nm wavelength) )to be.
- the negative biaxial retardation layer may have a phase difference Rth in the thickness direction with respect to light having a wavelength of 550 nm in a range of -400 nm to -5 nm.
- the thickness direction retardation Rth is, in another example, about -350 nm or more, -300 nm or more, -250 nm or more, -200 nm or more, about -150 nm or more, -100 nm or more, -80 nm or more, or -60 may be greater than or equal to nm.
- the thickness direction retardation Rth may be about -10 nm or less, about -15 nm or less, about -20 nm or less, -25 nm or less, -30 nm or less, -35 nm or less, or -40 nm or less in another example.
- the optical film can be applied to a liquid crystal display, especially an IPS liquid crystal display, to effectively perform a desired function.
- the term thickness direction retardation may be calculated by the following Equation 2.
- Rin is the retardation in phase
- d is the thickness of the layer
- Nz is the refractive index in the thickness direction of the layer (550 nm wavelength)
- Ny is the refractive index in the fast axis direction of the layer (550 nm wavelength) to be.
- the negative biaxial retardation layer may have so-called normal wavelength dispersion, flat wavelength dispersion or reverse wavelength dispersion, and in one example the normal wavelength dispersion characteristic Can have
- the retardation layer may be a polymer film.
- a method of imparting retardation by stretching or the like to a polymer film is known.
- the polymer film a cellulose film such as a triacetyle cellulose (TAC) film, a cyclic olefin polymer film such as a poly (norbonene) film, a polyester film such as a polycarbonate (PC) film, or an acrylic polymer film may be used.
- TAC triacetyle cellulose
- PC polycarbonate
- acrylic polymer film may be used as a uniaxial or biaxially stretched film for imparting phase difference.
- the thickness of the negative biaxial retardation layer is not particularly limited. However, the thickness may be determined within a range of about 1 ⁇ m to 100 ⁇ m in consideration of the possibility of achieving the desired phase difference or the applicability to a product. In another example, the thickness may be about 5 ⁇ m or more, 10 ⁇ m or more, 15 ⁇ m or more, or about 20 ⁇ m or more. In another example, the thickness may be about 90 ⁇ m or less, about 80 ⁇ m or less, about 70 ⁇ m or less, about 60 ⁇ m or less, about 50 ⁇ m or less, about 40 ⁇ m or less, or about 30 ⁇ m or less.
- the vertically aligned liquid crystal layer included in the optical film is a liquid crystal polymer layer including a liquid crystal that is substantially vertically aligned as described above, which may exhibit the properties of the + C plate.
- Substantially known liquid crystal polymer layers themselves that can exhibit the properties of the + C plate are variously known.
- the planar phase difference Rin with respect to light of the above-mentioned 550 nm wavelength is substantially 0 nm.
- the refractive index Nx in the slow axis direction and the refractive index Ny in the fast axis direction may be somewhat different due to the process error or the like. Therefore, in the vertically aligned liquid crystal layer, the planar phase difference Rin may be in a range of ⁇ 10 nm to 10 nm, ⁇ 5 nm to 5 nm, or ⁇ 3 nm to 3 nm.
- the phase difference Rth in the thickness direction with respect to light having a wavelength of 550 nm has a positive value.
- the thickness direction retardation of the vertically aligned liquid crystal layer may be determined in a range in which a total value of the phase difference and the thickness direction retardation of the negative biaxial retardation layer may have a positive value.
- the sum value that is, the sum of the thickness direction phase difference Rth (based on 550 nm) of the vertically aligned liquid crystal layer and the thickness direction phase difference Rth (based on the 550 nm) of the negative biaxial retardation layer is 0.
- nm More than nm, 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, 25 nm or more, 30 nm or more, 35 nm or more, 40 nm or more, 45 nm or more, 50 nm or more, 60 nm or more, 70 nm or more At least 75 nm or at least 80 nm.
- the sum is also 500 nm or less, 450 nm or less, 400 nm or less, 350 nm or less, 300 nm or less, 260 nm or less, 230 nm or less, 200 nm or less, 180 nm or less, 160 nm or less, 140 nm or less, 120 nm Up to 100 nm or up to 90 nm. This range may be important for optical compensation of liquid crystal displays, in particular optical compensation of IPS liquid crystal displays.
- the range of the thickness direction retardation of the vertically oriented liquid crystal layer is not particularly limited as long as it satisfies the total value, and may be, for example, within a range of about 50 nm to 500 nm.
- the thickness direction retardation Rth may be about 100 nm or more or 110 nm or more in another example. In another example, the thickness direction retardation Rth may be about 450 nm or less, about 400 nm or less, about 350 nm or less, about 300 nm or less, about 250 nm or less, about 200 nm or less, or about 150 nm or less.
- the vertically oriented liquid crystal layer may have so-called normal wavelength dispersion, flat wavelength dispersion, or reverse wavelength dispersion, and in one example, have normal wavelength dispersion characteristics. Can be.
- the vertically oriented liquid crystal layer itself exhibiting the properties of the + C plate is variously known, and in the present application, an appropriate kind having the above characteristics may be selected and used from these known materials.
- the thickness of the vertical alignment liquid crystal layer is not particularly limited, and may be determined in an appropriate range in consideration of the range of the desired phase difference, the applicability to the product, and the like.
- the optical film contains an isotropic layer.
- the absolute value of the difference in refractive index with the negative biaxial retardation layer or the vertical alignment liquid crystal layer is 0.1 or more, and the thickness is 100 nm to 200 nm, 100 nm to 195 nm, 100 nm to 190 nm, 100 It may be in the range of nm to 185 nm, 100 nm to 180 nm or 100 nm to 175 nm.
- This isotropic layer can induce so-called polarization rotation and thin film interference phenomena when light passes through the optical film, thereby adjusting the optical properties of the overall optical film to be suitable for optical compensation of liquid crystal displays, in particular IPS liquid crystal displays.
- the absolute value and thickness of the difference in refractive index of the isotropic layer have an important meaning in the overall structure of the optical film, that is, in the structure including the negative biaxial retardation layer and the vertical alignment liquid crystal layer. That is, unless the absolute value and thickness of the difference in the refractive index of the isotropic layer are present in the above range, the optical properties of the optical film are difficult to be adjusted to suit the compensation of the liquid crystal display.
- the isotropic layer may have an absolute value of a difference in refractive index between the negative biaxial retardation layer or the vertically aligned liquid crystal layer, and in another example, may be about 0.15 or more or about 0.2 or more. In another example, the absolute value may be about 1 or less, about 0.9 or less, about 0.8 or less, about 0.7 or less, about 0.6 or less, about 0.5 or less, about 0.4 or less, or about 0.3 or less.
- the isotropic layer having a thickness of 100 nm to 200 nm while having a difference in refractive index within the above range can suitably control the optical properties of the optical film.
- the refractive index of the isotropic layer is not particularly limited as long as it has the absolute value of the refractive index difference as described above.
- the refractive index of the isotropic layer may be higher than that of the retardation layer or the liquid crystal layer, or may be low.
- the isotropic layer may have a higher refractive index than the retardation layer or the liquid crystal layer.
- the refractive index may be about 1.5 or more, about 1.6 or more, about 1.7 or more, or about 1.75 or more.
- the refractive index may be about 2.5 or less, about 2 or less, about 1.9 or less, or about 1.85 or less in another example.
- the isotropic layer may have a lower refractive index than the retardation layer or the liquid crystal layer, and in this case, the refractive index may be about 1.4 or less, about 1.35 or less, or about 1.3 or less. In this case, the refractive index may be about 1.1 or more, about 1.2 or more, or about 1.25 or more in another example.
- the material of the isotropic layer is not particularly limited as long as it is substantially isotropic with the above refractive index.
- the isotropic layer when the isotropic layer is a high refractive layer, the isotropic layer may be a layer containing indium tin oxide (ITO), ZnS, titanium oxide, or the like.
- the isotropic layer when the isotropic layer is a low refractive layer, the isotropic layer may be, for example, a silicon-modified fluoropolymer, silicon oxide nanoparticles, or LSS-2233-10-PST known from U.S. Patent Application Publication No. 2006-0148824 or the like. Silicone materials such as those known under the trade names such as Polymer Systems Technoloy Limited, and the like.
- any material having an average refractive index difference and a refractive index difference of 0.1 or more and having isotropy may be used as a material constituting the isotropic material layer.
- the manner of forming the isotropic layer using the above materials is not particularly limited.
- the isotropic layer is a layer of an inorganic material
- a known method of sputtering, vacuum deposition, or the like may be applied, or a method such as sol-gel coating may be applied
- a method such as sol-gel coating may be applied
- deposition such as iCVD is performed.
- Method, or wet or dry coating method may be applied.
- the optical film of the present application may further include other layers, if necessary, in addition to the retardation layer, the liquid crystal layer, and the isotropic layer described above.
- the optical film may further include a vertical alignment layer disposed adjacent to the liquid crystal layer.
- a vertical alignment layer disposed adjacent to the liquid crystal layer.
- the present application also relates to a composite polarizer.
- the composite polarizing plate of the present application may include a polarizer and the optical film disposed on one side of the polarizer.
- a polarizing plate may be a polarizing plate for a liquid crystal display, for example, an IPS liquid crystal display.
- the polarizing plate may be a viewing side polarizing plate.
- the term viewer-side polarizing plate may mean a polarizing plate disposed closer to the observer side among polarizing plates included in a liquid crystal display.
- the kind of polarizer applied to the polarizing plate of the present application is not particularly limited, and a known polarizer may be used.
- the polarizer may be a polyvinyl alcohol film or the like in which a dichroic substance such as iodine is adsorbed, or a coating layer of a breast liquid crystal compound, or a host guest including a reactive liquid crystal composition and a dichroic dye. guest) may be a coating layer of the liquid crystal composition.
- the optical film has the negative biaxial retardation layer disposed closer to the polarizer than the vertical alignment liquid crystal layer, or conversely, the vertical alignment liquid crystal layer is closer to the polarizer than the negative biaxial retardation layer. May be arranged.
- the slow axis of the negative biaxial retardation layer is about 80 degrees to 100 degrees with the light absorption axis of the polarizer. , About 85 degrees to 95 degrees or about 90 degrees.
- the slow axis of the negative biaxial retardation layer is about 170 to 190 degrees and about 175 to the light absorption axis of the polarizer. About 185 degrees or about 180 degrees.
- the composite polarizing plate may further include other layers as necessary in addition to the polarizer and the optical film described above.
- the composite polarizing plate may include a polarizer protective film disposed on one side or both sides of the polarizer.
- the kind of said polarizer protective film is not specifically limited.
- the composite polarizing plate does not necessarily include the protective film.
- the optical film may serve as the protective film, in which case the optical film may be used as the inner protective film.
- the term internal protective film in the present application may mean a protective film disposed between the liquid crystal cell and the polarizer when the composite polarizing plate is applied to the liquid crystal display.
- the present application relates to a liquid crystal display comprising the optical film or the composite polarizing plate, for example, an IPS liquid crystal display.
- the term IPS liquid crystal display may include not only a general IPS mode, but also a liquid crystal display called a SIPS (Super In Plane Switching) or FFS (Fringe Field Switching) mode.
- the liquid crystal display may include at least a viewing side polarizer, a liquid crystal cell, and a lower polarizer.
- the term "viewing side polarizing plate” may refer to a polarizing plate disposed closer to an observer than a lower polarizing plate.
- the optical film may be disposed between the viewer-side polarizing plate and the liquid crystal cell.
- the negative biaxial retardation layer is disposed closer to the viewing side polarizer than the vertical alignment liquid crystal layer, or conversely, the vertical alignment liquid crystal layer is disposed closer to the viewing side polarizer than the retardation layer.
- the slow axis of the retardation layer may be about 80 degrees to 100 degrees, about 85 degrees to 95 degrees, or about 90 degrees to the light absorption axis of the viewing side polarizer. .
- the slow axis of the negative biaxial retardation layer is about 170 to 190 degrees and about 175 to the light absorption axis of the viewing side polarizer. About 185 degrees or about 180 degrees.
- the composite polarizing plate when the composite polarizing plate is included in the liquid crystal display, the composite polarizing plate may be used as the viewing side polarizing plate of the display, in this case, an optical film may be disposed between the polarizer and the liquid crystal cell of the composite polarizing plate.
- the kind or arrangement of other components included in the liquid crystal display of the present application are not particularly limited, and general matters applied in the liquid crystal display field may be applied.
- the liquid crystal cell may include a horizontally oriented liquid crystal having an optical axis (eg, a slow axis) on a plane parallel to the surfaces of the viewer side and the lower polarizer.
- the liquid crystal may have positive dielectric anisotropy or negative dielectric anisotropy.
- the light absorption axis of the viewer side and the lower polarizing plate may be disposed perpendicular to each other.
- the IPS liquid crystal display may be a liquid crystal display of so-called O mode or E mode, whereby the optical axis (eg slow axis) of the liquid crystal cell including the horizontally oriented liquid crystal in the black state is lowered. It may be arranged to be parallel or perpendicular to the light absorption axis of the polarizing plate.
- the present application can provide an optical film or composite polarizing plate and liquid crystal display including the same that can be effectively applied to the optical compensation of various liquid crystal displays, in particular, so-called In plane switching (IPS) liquid crystal display.
- IPS In plane switching
- 1 is an exemplary diagram for displaying a slow axis, a fast axis, and a thickness direction of a retardation layer or a liquid crystal layer.
- FIGS. 2 and 3 are cross-sectional views illustrating the structure of an optical film by way of example.
- the retardation of the retardation layer or the liquid crystal layer in the surface and thickness direction of the Examples and Comparative Examples and the retardation characteristics according to the wavelength was measured using Axoscan equipment (manufactured by Axomatrics) capable of measuring 16 Muller Matrix. Surface or thickness retardation other than the retardation characteristic according to the wavelength was measured based on light of 550 nm wavelength. Using the Axoscan instrument, 16 Muller matrices were obtained according to the manufacturer's manual, and the phase difference was extracted through the Axoscan instrument.
- the thickness of the sample such as the thickness of the isotropic layer, was measured according to the manufacturer's manual using Filmetrics F20 equipment.
- an acrylic polymer film (thickness: about 25 ⁇ m) having a plane retardation (reference wavelength: 550 nm) of about 120 nm and a retardation in the thickness direction (reference wavelength: 550 nm) of about ⁇ 45 nm
- a vertical alignment layer is formed on one surface of about 1.51) in a known manner, and a vertically oriented reactive liquid crystal compound (RM: Reactive Mesogen) is oriented and polymerized on the vertical alignment layer to have a vertical direction phase difference of about +130 nm.
- An orientation liquid crystal layer (refractive index: about 1.55) was formed.
- an indium tin oxide (ITO) layer was deposited on the vertically aligned liquid crystal layer by a known sputtering method to form an isotropic layer having a refractive index of about 1.8 and a thickness of about 100 nm.
- a known poly (vinyl alcohol) -based absorption type polarizer is attached to the surface of the acrylic polymer film on which the vertically aligned liquid crystal layer is not formed so that the light absorption axis of the polarizer is perpendicular to the slow axis of the acrylic polymer film.
- the manufactured liquid crystal display sequentially includes a lower polarizing plate and a backlight unit on a side opposite to the side where the composite polarizing plate of the liquid crystal cell is disposed, and the light absorption axes of the composite polarizing plate and the lower polarizing plate are perpendicular to each other.
- the liquid crystal cell contained a horizontally oriented liquid crystal, the plane phase difference was about 295 nm, and the slow axis of the horizontally oriented liquid crystal was perpendicular to the light absorption axis of the composite polarizing plate in a black state.
- FIG. 4 is a photograph of color change at an inclination angle of the composite polarizing plate using an EZ contrast 160R manufactured by Eldim, and a wavelength dispersion characteristic of the optical film (a laminate of an acrylic film, a vertical alignment liquid crystal layer, and an ITO layer) is , Shown in FIG. 8.
- the laminate or composite polarizing plate exhibits excellent wavelength dispersion characteristics that correspond to the so-called reverse wavelength dispersion characteristics, and also has an excellent compensation effect at the viewing angle.
- wavelength dispersion characteristics of the first embodiment and other embodiments described later are overlapped to almost similar levels.
- drawings of Comparative Examples 3 and 4 described later also have similar tendencies with each other, they are confirmed by overlapping with patterns different from those of the Examples.
- An optical film, a composite polarizing plate, and an IPS liquid crystal display were manufactured in the same manner as in Example 1, except that an indium tin oxide (ITO) layer was formed on the vertical alignment liquid crystal layer to a thickness of about 143 nm.
- ITO indium tin oxide
- 5 is a photograph obtained by measuring the color change in the inclination angle of the composite polarizing plate using the EZ contrast 160R of Eldim, the wavelength dispersion characteristics of the optical film (acryl film, vertical alignment liquid crystal layer and ITO layer) , Shown in FIG. 8. 5 and 8, it can be confirmed that the laminate or composite polarizing plate exhibits excellent wavelength dispersion characteristics corresponding to the so-called reverse wavelength dispersion characteristics, and also has an excellent compensation effect at the viewing angle.
- FIG. 6 is a photograph obtained by measuring color change at an inclination angle of the composite polarizing plate using an EZ contrast 160R manufactured by Eldim, and a wavelength dispersion characteristic of the optical film (a laminate of an acrylic film, a vertical alignment liquid crystal layer, and an ITO layer) is , Shown in FIG. 8. 6 and 8, it can be confirmed that the laminate or composite polarizing plate exhibits excellent wavelength dispersion characteristics corresponding to the so-called reverse wavelength dispersion characteristics, and also has an excellent compensation effect at the viewing angle.
- ITO indium tin oxide
- FIG. 7 is a photograph obtained by measuring color change at an inclination angle of the composite polarizing plate using an EZ contrast 160R manufactured by Eldim.
- the wavelength dispersion characteristic of the optical film (a laminate of an acrylic film, a vertical alignment liquid crystal layer, and an ITO layer) is , Shown in FIG. 8. It can be seen from FIGS. 7 and 8 that the laminate or composite polarizing plate exhibits excellent wavelength dispersion characteristics corresponding to the so-called reverse wavelength dispersion characteristics, and also has an excellent compensation effect at the viewing angle.
- Example 2 An optical film and a composite polarizing plate in the same manner as in Example 1 except that a vertical indium tin oxide (ITO) layer was formed to a thickness of about 200 nm without forming a vertical alignment layer and a vertical alignment liquid crystal layer on the acrylic polymer film. And IPS liquid crystal displays.
- ITO indium tin oxide
- IPS liquid crystal displays On the other hand, the compensation effect at the viewing angle was measured in the same manner as in the above embodiment, but a suitable compensation effect was not exerted, and light leakage at the inclination angle was severely generated.
- An optical film, a composite polarizing plate, and an IPS liquid crystal display were manufactured in the same manner as in Example 1, except that an indium tin oxide (ITO) layer was not formed on the vertically aligned liquid crystal layer.
- ITO indium tin oxide
- the compensation effect at the viewing angle was measured in the same manner as in the above embodiment, but a suitable compensation effect was not exerted, and light leakage at the inclination angle was severely generated.
- an optical film, a composite polarizing plate, and an IPS liquid crystal display were manufactured in the same manner as in Example 1, except that an indium tin oxide (ITO) layer was formed to a thickness of about 90 nm on the vertical alignment liquid crystal layer.
- ITO indium tin oxide
- the compensation effect at the viewing angle was measured in the same manner as in the above embodiment, but a suitable compensation effect was not exerted, and light leakage at the inclination angle was severely generated.
- the wavelength dispersion characteristic may be similar to the so-called constant wavelength dispersion characteristic, and thus, it may be predicted that proper compensation is not achieved.
- an optical film, a composite polarizing plate, and an IPS liquid crystal display were manufactured in the same manner as in Example 1, except that an indium tin oxide (ITO) layer was formed to a thickness of about 210 nm on the vertical alignment liquid crystal layer.
- ITO indium tin oxide
- the compensation effect at the viewing angle was measured in the same manner as in the above embodiment, but a suitable compensation effect was not exerted, and light leakage at the inclination angle was severely generated.
- the wavelength dispersion characteristic may be similar to the so-called constant wavelength dispersion characteristic, and thus, it may be predicted that proper compensation is not achieved.
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Claims (15)
- 음의 이축성 위상차층; 상기 음의 이축성 위상차층의 하부에 존재하는 수직 배향 액정층; 및 상기 음의 이축성 위상차층과 수직 배향 액정층의 사이, 상기 음의 이축성 위상차층의 상부 또는 상기 수직 배향 액정층의 하부에 존재하며, 상기 음의 이축성 위상차층 또는 수직 배향 액정층과의 굴절률의 차이의 절대값이 0.1 이상이고, 두께가 100 nm 내지 200 nm의 범위 내인 등방성층을 포함하는 광학 필름.
- 제 1 항에 있어서, 등방성층은 수직 배향 액정층의 하부에 존재하는 광학 필름.
- 제 1 항에 있어서, 음의 이축성 위상차층은, 550 nm의 파장의 광에 대한 면상 위상차(Rin)가 20 nm 내지 300 nm의 범위 내에 있는 광학 필름.
- 제 1 항에 있어서, 음의 이축성 위상차층은, 550 nm의 파장의 광에 대한 두께 방향의 위상차(Rth)가 -400 nm 내지 -5 nm의 범위 내에 있는 광학 필름.
- 제 1 항에 있어서, 음의 이축성 위상차층은, 정상 파장 분산 특성을 가지는 광학 필름.
- 제 1 항에 있어서, 음의 이축성 위상차 필름은, 아크릴 폴리머 필름 또는 고리형 올레핀 폴리머 필름인 광학 필름.
- 제 1 항에 있어서, 수직 배향 액정층의 두께 방향 위상차와 음의 이축성 위상차층의 두께 방향 위상차의 합계 수치가 20 nm 이상인 광학 필름.
- 제 1 항에 있어서, 수직 배향 액정층은, 정상 파장 분산 특성을 가지는 광학 필름.
- 제 1 항에 있어서, 등방성층의 굴절률이 1.5 이상인 광학 필름.
- 제 1 항에 있어서, 등방성층의 굴절률이 1.4 이하인 광학 필름.
- 제 1 항에 있어서, 등방성층은, ITO(Indium Tin Oxide), ZnS, 산화 티탄, 실리콘 개질 플루오로 폴리머, 산화 규소 입자 또는 실리콘 물질을 포함하는 광학 필름.
- 편광자 및 상기 편광자의 일측에 배치되어 있는 제 1 항의 광학 필름을 포함하는 복합 편광판.
- 제 12 항에 있어서, 광학 필름의 음의 이축성 위상차층이 수직 배향 액정층에 비하여 편광자에 가깝게 배치되어 있고, 상기 음의 이축성 위상차층의 지상축이 상기 편광자의 광흡수축과 이루는 각도가 80도 내지 100도의 범위 내에 있는 복합 편광판.
- 제 12 항에 있어서, 광학 필름의 수직 배향 액정층이 음의 이축성 위상차층에 비하여 편광자에 가깝게 배치되어 있고, 상기 음의 이축성 위상차층의 지상축이 상기 편광자의 광흡수축과 이루는 각도가 170도 내지 190도의 범위 내에 있는 복합 편광판.
- 제 1 항의 광학 필름 또는 제 12 항의 복합 편광판을 포함하는 액정 디스플레이.
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JP2015559209A JP6304664B2 (ja) | 2013-10-01 | 2014-10-01 | 光学フィルム、これを含む複合偏光板および液晶ディスプレイ |
CN201480016108.8A CN105190379B (zh) | 2013-10-01 | 2014-10-01 | 光学膜 |
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KR1020140132262A KR101694587B1 (ko) | 2013-10-01 | 2014-10-01 | 광학 필름 |
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