WO2010128779A2 - Assemblage de plaques polarisantes couplées et affichage à cristaux liquides à mode phase bleue comportant cet assemblage - Google Patents

Assemblage de plaques polarisantes couplées et affichage à cristaux liquides à mode phase bleue comportant cet assemblage Download PDF

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Publication number
WO2010128779A2
WO2010128779A2 PCT/KR2010/002791 KR2010002791W WO2010128779A2 WO 2010128779 A2 WO2010128779 A2 WO 2010128779A2 KR 2010002791 W KR2010002791 W KR 2010002791W WO 2010128779 A2 WO2010128779 A2 WO 2010128779A2
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Prior art keywords
polarizing plate
liquid crystal
coupled polarizing
compensation film
coupled
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WO2010128779A3 (fr
WO2010128779A9 (fr
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Bong Choon Kim
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Dongwoo Fine Chem Co Ltd
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Dongwoo Fine Chem Co Ltd
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Priority to CN2010800196619A priority Critical patent/CN102414588A/zh
Priority to JP2012509725A priority patent/JP5602221B2/ja
Publication of WO2010128779A2 publication Critical patent/WO2010128779A2/fr
Publication of WO2010128779A3 publication Critical patent/WO2010128779A3/fr
Publication of WO2010128779A9 publication Critical patent/WO2010128779A9/fr
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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
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

Definitions

  • the present invention relates to a liquid crystal display capable of ensuring a wide viewing angle by applying a specified coupled polarizing plate set to a blue phase liquid crystal mode.
  • LCDs Liquid crystal displays
  • LCDs include a liquid crystal display panel and a backlight assembly providing light to the liquid crystal display panel.
  • the liquid crystal display generates an electric field in a liquid crystal layer by applying a voltage to a field generating electrode, thereby determining alignment of liquid crystal molecules of the liquid crystal layer and displaying images by controlling polarization of incident light.
  • a fast response speed of a liquid crystal layer is required in order to quickly change an alignment state because a transmittance of light is determined by the alignment state of the liquid crystal layer.
  • the blue phase liquid crystal has a relatively very fast response speed of about 3 microseconds since it has optically isotopic characteristics when an electric field is not applied and optically anisotropic characteristics while the electric field is applied.
  • a coupled polarizing plate set for in-plane switching liquid crystal display has been used in order to ensure a wide viewing angle of the blue phase liquid crystal display.
  • the coupled polarizing plate set comprised an isotropic protection film, and two kinds of compensation films having different optical properties (at least one of the compensation films can have a retardation property).
  • Each of the isotropic protection film and the two kinds of compensation films was positioned between the blue phase liquid crystal and any one of the polarizers. Disclosure of Invention Technical Problem
  • the present invention provides a coupled polarizing plate set for the blue phase liquid crystal display which has simple constitution and easy mass productivity with low price and which can provide wide viewing angles equal to or superior to prior coupled polarizing plate sets, in particular, the coupled polarizing plate set for in-plane switching liquid crystal display.
  • the present invention also provides the blue phase liquid crystal display including the coupled polarizing plate set of the invention.
  • a coupled polarizing plate set comprising: a first coupled polarizing plate; and a second coupled polarizing plate, wherein each of the first coupled polarizing plate and the second coupled polarizing plate is constituted by a compensation film, a polarizer, and a protection film in sequence close from a liquid crystal, the compensation film of the first coupled polarizing plate has an in-plane retardation (RO) of 15 to 130nm and a refractive index ratio (NZ) of -6.0 to -0.1, with its slow axis parallel to the absorption axis of the adjacent polarizer, and the compensation film of the second coupled polarizing plate has an in-plane retardation (RO) of 15 to 130nm and a refractive index ratio (NZ) of 1.1 to 7.0, with its slow axis perpendicular to the absorption axis of the adjacent polarizer.
  • RO in-plane retardation
  • NZ refractive index ratio
  • the blue phase liquid crystal display including the coupled polarizing plate set comprising the first coupled polarizing plate and the second coupled polarizing plate as upper and lower polarizing plates of the blue phase liquid crystal mode.
  • the coupled polarizing plate set for the blue phase liquid crystal display has simple constitution and easy mass productivity with low price and can provide wide viewing angles equal to or superior to prior coupled polarizing plate sets, in particular, the coupled polarizing plate set for in- plane switching liquid crystal display.
  • the blue phase liquid crystal display provides wide viewing angles equal to or superior to prior in-plane switching liquid crystal displays.
  • FIG. 1 is a perspective view illustrating the structure of a vertical alignment type liquid crystal display according to one embodiment of the present invention
  • FIG. 2 is a schematic view illustrating refractive index of a compensation film according to the present invention.
  • FIG. 3 is a schematic view showing an MD in a manufacturing process for illustrating an unrolled direction of a compensation film and a polarizing plate according to the present invention
  • FIG. 4 is a schematic view illustrating expression of ⁇ and ⁇ in a coordinate system of the present invention
  • FIG. 5 is a graph illustrating wavelength dispersive characteristic of full range of wavelengths for a second compensation film used in a first example of the present invention
  • FIG. 6 is a graph illustrating wavelength dispersive characteristic of full range of wavelengths for a first compensation film used in a first embodiment
  • FIG. 7 is a view showing the simulation result of transmittance from all light directions according to a first example of the present invention.
  • FIG. 9 is a view showing the simulation result of transmittance from all light directions at the time of adopting a coupled polarizing plate set for an in-plane switching liquid crystal display to a liquid crystal mode of the present invention
  • FIG. 10 is a view showing the simulation result of transmittance from all light directions according to a second example of the present invention.
  • FIG. 12 is a view showing the simulation result of transmittance from all light directions according to a third example of the present invention.
  • FIG. 14 is a view showing the simulation result of transmittance from all light directions according to a fourth example of the present invention.
  • FIG. 16 is a view showing the simulation result of transmittance from all light directions according to a fifth example of the present invention.
  • FIG. 18 is a view showing the simulation result of transmittance from all light directions according to a sixth example of the present invention.
  • FIG. 20 is a view showing the simulation result of transmittance from all light directions according to a seventh example of the present invention.
  • FIG. 22 is a view showing the simulation result of transmittance from all light directions according to an eighth example of the present invention.
  • FIG. 24 is a view showing the simulation result of transmittance from all light directions according to a ninth example of the present invention.
  • FIG. 26 is a view showing the simulation result of transmittance from all light directions according to a tenth example of the present invention.
  • FIG. 28 is a view showing the simulation result of transmittance from all light directions according to a first comparative example of the present invention.
  • FIG. 29 is a view showing the simulation result of transmittance from all light di- rections according to a second comparative example of the present invention.
  • FIG. 30 is a view showing the simulation result of transmittance from all light directions of according to a third comparative example of the present invention.
  • FIG. 31 is a view showing the simulation result of transmittance from all light directions of according to a fourth comparative example of the present invention.
  • FIG. 32 is a view showing the simulation result of transmittance from all light directions according to a fifth comparative example of the present invention.
  • FIG. 33 is a view showing the simulation result of transmittance from all light directions of according to a sixth comparative example of the present invention. Best Mode for Carrying out the Invention
  • the present invention relates to a coupled polarizing plate set comprising a first coupled polarizing plate and a second coupled polarizing plate where compensation films having specific optical properties are laminated, respectively.
  • each of the first coupled polarizing plate and the second coupled polarizing plate of the coupled polarizing plate set is constituted by a compensation film, a polarizer, and a protection film in sequence close from a liquid crystal.
  • the compensation film of the first coupled polarizing plate has an in-plane retardation (RO) of 15 to 130nm and a refractive index ratio (NZ) of -6.0 to -0.1 and the compensation film of the second coupled polarizing plate has an in-plane retardation (RO) of 15 to 130nm and a refractive index ratio (NZ) of 1.1 to 7.0.
  • the compensation film of the first coupled polarizing plate has its slow axis parallel to the absorption axis of the adjacent polarizer
  • the compensation film of the second coupled polarizing plate has its slow axis perpendicular to the absorption axis of the adjacent polarizer.
  • optical properties of the compensation films of the present invention are defined by the following Formulae 1 to 3 with respect to all wavelengths within the visible light region.
  • Nx is the refractive index of an axis having the largest refractive index of light that oscillate in the in-plane direction
  • Ny is the refractive index of light that oscillate in the perpendicular direction to Nx in the in-plane direction
  • Nz is a refractive index of light that oscillate in the thickness direction, which are expressed as follows, in FIG. 2.
  • Nx and Ny are refractive indices of light that oscillate in the in-plane direction and Nx ⁇ Ny
  • Nz is a refractive index of light that oscillate in the thickness direction of a film
  • d is thickness of the film
  • Nx and Ny are refractive indices of light that oscillate in the in-plane direction and d is thickness of a film, and Nx ⁇ Ny).
  • Nx and Ny are refractive indices of light that oscillate in the in-plane direction and Nx ⁇ Ny
  • Nz is a refractive index of light that oscillate in the thickness direction of a film
  • d is thickness of the film
  • Rth is a thickness retardation, which shows a phase difference to the in-plane average refractive index in the thickness direction and is not a substantial phase difference, but a reference value
  • RO is an in-plane retardation, which is a substantial phase difference when light has penetrated a film in the normal direction (perpendicular direction).
  • NZ is a refractive index ratio, from which the types of plates of compensation films can be distinguished.
  • the type of the plate of compensation films is referred to as an A-plate when an optical axis without a phase difference exists in the in-plane direction of the film, a C-plate when the optical axis exists in the perpendicular direction to the plane, and a biaxial plate when two optical axes exist.
  • the A-plate and the C-plate are discriminated by setting an approximate range of a refractive index ratio for the A-plate and a predetermined value within the range of the in-plane retardation for the C-plate. Setting a predetermined value is limited in application to all other materials having different refractive indices dependant upon extension. Therefore, the compensation films included in the upper and lower polarizing plate of the present invention are represented by, NZ, RO, and Rth etc. with numerals, which are optical properties of plates, not according to refractive index isotropy.
  • These compensation films are provided with a phase difference by extension, in which a film having a refractive index increasing in the extension direction has positive (+) refractive index properties and a film having a refractive index decreasing in the extension direction has negative (-) refractive index properties.
  • the compensation film having positive (+) refractive index properties can be made of one selected from the group consisting of TAC (TriAcetyl Cellulose), COP (Cyclo-Olefin Polymer), COC (Cyclo-Olefin Copolymer), PET (Polyethylene Terephthalate), PP (Polypropylene), PC (Polycarbonate), PSF (Polysulfone), and PMMA (Poly Methyl- methacrylate), and a compensation film having the negative (-) refractive index can be made of, in detail, modified-PS (polystyrene) or modified-PC (Polycarbonate).
  • TAC TriAcetyl Cellulose
  • COP Cyclo-Olefin Polymer
  • COC Cyclo-Olefin Copolymer
  • PET Polyethylene Terephthalate
  • PP Polypropylene
  • PC Polycarbonate
  • PSF Polysulfone
  • PMMA Poly Methyl- methacrylate
  • the extension method providing a compensation film with optical properties is divided into a fixed-end extension and free-end extension, in which the fixed-end extension is to fix the length other than the extension direction during extension of a film and the free-end extension is to provide a degree of freedom in another direction than the extension direction during extension of a film.
  • the fixed-end extension is to fix the length other than the extension direction during extension of a film
  • the free-end extension is to provide a degree of freedom in another direction than the extension direction during extension of a film.
  • a film contracts in another direction than the extension direction in extension, but a Z-axis alignment film requires a specific contraction process rather than extension.
  • FIG. 3 shows a direction of a rolled raw film, in which the unrolled direction of the rolled film is referred to as an MD (Machine direction) and the direction perpendicular to the MD is referred to as a TD (Transverse direction). Further, in the process, extension of the film in the MD is referred to as free-end extension and extension in the TD is referred to as fixed-end extension.
  • MD Machine direction
  • TD Transverse direction
  • the positive A-plate can be manufactured by free-end extending a film having positive (+) refractive index properties, the negative biaxial A- plate by fixed-end extending a film having positive (+) refractive properties, the Z-axis alignment film by free-end extending and then fixed-end contracting a film having positive (+) refractive properties or negative (-) refractive properties, the negative A- plate by free-end extending a film having negative (-) refractive properties, and the positive biaxial A-plate by fixed-end extending a film having negative (-) refractive properties.
  • the coupled polarizing plate set according to the present invention comprises the first coupled polarizing plate and the second coupled polarizing plate each of which is constituted by the compensation film, the polarizer, and the protection film.
  • the compensation film of the first coupled polarizing plate has an in-plane retardation (RO) of 15 to 130nm and a refractive index ratio (NZ) of -6.0 to -0.1.
  • RO in-plane retardation
  • NZ refractive index ratio
  • the in-plane retardation (RO) can be properly selected depending on the refractive index ratio (NZ).
  • the refractive index ratio (NZ) is less than -6.0, the dispersive characteristic representing a polarization state difference depending on a wavelength after passing through a liquid crystal display having an optimal viewing angle effect, which is constituted by a first compensation film, a liquid crystal cell, and a second compensation film becomes too large, such that although a reference wavelength is compensated, other wavelengths are not normally compensated. Therefore, it is difficult to achieve the effect of the present invention.
  • the refractive index ratio (NZ) is more than -0.1, the slow axis direction of the compensation film and the MD (Machine Direction) are different from each other. Therefore, application to a roll-to-roll process is not easy.
  • the in-plane retardation (RO) is 40 to 130nm and the refractive index ratio
  • NZ is -2 to -0.1, and these ranges were determined in consideration of optical characteristics and facility in the manufacturing process.
  • the minimum retardation value should be maintained at 40nm or more to manufacture a compensation film that is now generally applied to liquid crystal displays and has a uniform retardation value (target value within ⁇ 5nm) and a retardation angle ( ⁇ 0.5).
  • the refractive index ratio (NZ) of -0.2 to -0.1 is a range where the compensation film intended by the present invention can be manufactured only by TD uniaxial extension.
  • the minimum retardation value for easily manufacture a compensation film having uniform retardation value and retardation angle in actual processes is 50nm or more, it is preferable that the in-plane retardation (RO) is 50 to 130nm and the refractive index ratio (NZ) for easy TD uniaxial extension in actual processes is maintained at -1.0 to - 0.1.
  • the TD uniaxial extension is simpler in process than biaxial extension, thereby reducing the manufacturing cost.
  • the compensation film of the first coupled polarizing plate is disposed such that the slow axis is parallel to the absorption axis of the adjacent polarizer.
  • the compensation film of the second coupled polarizing plate has an in-plane retardation (RO) of 15 to 130nm and a refractive index ratio (NZ) of 1.1 to 7.0, the less the absolute value of the refractive index ratio, the more easy it to ensure a more excellent wide viewing angle, and the in-plane retardation (RO) may be appropriated combined in accordance with the refractive index ratio (NZ). Further, a combination for easily ensuring a wide viewing angle is used in consideration of the compensation film and the optical characteristics of the first coupled polarizing plate.
  • RO in-plane retardation
  • NZ refractive index ratio
  • the in-plane retardation (RO) is 40 to 130nm and the refractive index ratio
  • NZ is 1.1 to 3.0, and more preferably, the in-plane retardation (RO) is 50 to 130 and the refractive index ratio (NZ) is 1.1 to 2.0. Theses ranges were also determined in consideration of the optical characteristics and facility in the manufacturing process, similar to the compensation film of the first coupled polarizing plate.
  • the slow axis of the compensation film of the second coupled polarizing plate is perpendicular to the absorption axis of the adjacent polarizer.
  • a compensation film has a phase difference that is different in accordance with the wavelength of incident light.
  • the phase difference is large at a short wavelength and small at a long wavelength, and a compensation film having theses properties is referred to as a compensation film having a normal dispersive characteristic.
  • a film having a small phase difference at a short wavelength and a large phase difference at a long wavelength is referred to as a compensation film having an inverse dispersive characteristic.
  • the dispersive characteristic of the compensation films are represented by a ratio of a phase difference for a light source of 380nm to a phase difference for a light source of 780nm as generally used in this field.
  • Each polarizer of the first and the second coupled polarizing plates can have polarizing functional layer which is made through extending and dyeing PVA (Polyvinyl Alcohol).
  • the polarizer has a protection film at farther side from the liquid crystal cell respectively.
  • the first and second coupled polarizing plates can be manufactured by a method generally used in this field, and in detail, a roll-to-roll process and a sheet- to-sheet process can be used. It is preferable to use the roll-to-roll process in consideration of the yield and efficiency in the manufacturing process, and in particular, it is effective because the direction of the absorption axis of the PVA polarizer is always fixed in the MD.
  • the protection films of the first and the second coupled polarizing plates could be things that are generally used in this field. It is preferable for the protection films to have optical properties that influence the viewing angle as little as possible.
  • Material for the protection films could be one selected from the group consisting of TAC (Tri- Acetyl Cellulose), COP (Cyclo-Olefin Polymer), COC (Cyclo-Olefin Copolymer), PET (Polyethylene Terephthalate), PP (Polypropylene), PC (Polycarbonate), PSF (Polysulfone) and PMMA (Poly Methylmethacrylate).
  • the present invention relates to a liquid crystal display including a blue phase liquid crystal panel and the coupled polarizing plate set comprising the first coupled polarizing plate and the second coupled polarizing plate as the upper and lower polarizing plates respectively.
  • the first coupled polarizing plate may be disposed as the upper polarizing plate and the second coupled polarizing plate may be disposed as the lower polarizing plate, or the second coupled polarizing plate may be disposed as the upper polarizing plate and the first coupled polarizing plate may be disposed as the lower polarizing plate.
  • the absorption axis of the polarizer of the first coupled polarizing plate is perpendicular to that of the polarizer of the second coupled polarizing plate.
  • the blue phase liquid crystal has optically isotopic characteristics when an electric field is not applied and optically anisotropic characteristics while the electric field is applied.
  • the liquid crystal forms a cylindrical array in which molecules are twisted and arranged in a 3D spiral. This alignment structure is referred to as a double twist cylinder (hereinafter, referred to as 'DTC).
  • the blue phase liquid crystals are further twisted to the outside from the central axis of the DTC. That is, the blue phase liquid crystals are arranged in the twisted state that two twist axes are perpendicular to each other in the DTC to have directionality in the DTC on the basis of the central axis of the DTC.
  • the blue phase liquid crystal includes a first blue phase, a second blue phase, and a third blue phase.
  • the arrangement structure depends on the type of the blue phase in the DTC.
  • the DTCs are arranged in a body-centered cubic structure which is one of a lattice structure and in the second blue phase, the DTCs are arranged in a simple cubic structure. Since in the blue phase, the DTCs are arranged in the lattice structure, a disclination occurs at a portion where three adjacent DTCs meet. The disclination is a part where the liquid crystals are irregularly arranged without regular directionality and forms a disclination line.
  • the anisotropic refractive index of the blue phase liquid crystal varies in proportion to the square of applied voltage depending on the intensity of the applied voltage.
  • An optical effect in which the refractive index is in proportion to the square of the applied voltage when the electric field is applied to an isotropic polarized material is referred to as the Kerr effect. Since the liquid crystal display displays the image by using the Kerr effect of the blue phase liquid crystal, response speed is improved.
  • the refractive index of the blue phase liquid crystal is determined for each of regions where the electric field is formed.
  • the liquid crystal display has uniform luminance irrespective of cell gap uniformity, thereby improving the display characteristics of the liquid crystal display.
  • the maximum transmittance from all light directions satisfies a compensation relationship of 0.05% or less, preferably a compensation relationship of 0.02% or less in the black mode.
  • the highest front luminance of the currently produced liquid crystal display shows approximately 10000 nits by using a vertical alignment (VA) mode.
  • the brightness is approximately 10000 nits cos60° at a viewing angle of a 60° inclined angle and the luminance corresponding to 0.05% of the brightness is 2.5 nits. Therefore, the present invention will implement the transmittance from all light directions equal to or more than that of the liquid crystal display adopting the VA mode.
  • FIG. 1 is a perspective view illustrating one of the basic structures of a liquid crystal display for a blue phase liquid crystal according to the present invention, which is described hereinafter.
  • a second polarizer 11, a second compensation film 14, a blue phase liquid crystal cell 30, a first compensation film 24, a first polarizer 21, and a first protection film 23 are laminated in sequence from the backlight unit 40.
  • the absorption axes 12 and 22 of the first polarizer 21 and the second polarizer 11 are perpendicular to each other, the slow axis of the first compensation film is parallel to the absorption axis of the first polarizer, and the slow axis of the second compensation film is perpendicular to the absorption axis of the second polarizer. More specifically, as shown in FIG.
  • the first coupled polarizing plate is disposed at upper section of the coupled polarizing plate set as an upper polarizing plate, wherein the slow axis 25 of the first compensation film 24 is parallel to the absorption axis 22 of the first polarizer 21, and the slow axis 15 of the second compensation film 14 is perpendicular to the absorption axis 12 of the second polarizer 11. Meanwhile, as shown in FIG.
  • the first coupled polarizing plate is disposed at lower section of the coupled polarizing plate set as a lower polarizing plate, wherein the slow axis 25 of the first compensation film 24 is parallel to the absorption axis 22 of the first polarizer 21, and the slow axis 15 of the second compensation film 14 is perpendicular to the absorption axis 12 of the second polarizer 11.
  • FIG. 3 is a schematic view illustrating an MD in a roll-to-roll manufacturing process. Referring to FIG. 3, the configuration of FIG. l(a) will be described as follows.
  • the first coupled polarizing plate 20 and the second coupled polarizing plate 10 are manufactured by a combination of various optical films and each of the optical films exists in a roll state before being attached to the coupled polarizing plate.
  • a direction of unrolling or rolling the film from or on the roll is referred to as a machine direction (MD).
  • MD machine direction
  • the second coupled polarizing plate 10 when only the MDs of absorption axis 12 of the second polarizer 11 and the slow axis 15 of the second compensation film 14 coincide with each other irrespective of the direction of the second protection film 13, the roll-to-roll production is possible.
  • the first coupled polarizing plate 20 when only the MDs of the first polarizer 21 and the first compensation film 24 coincide with each other irrespective of the direction of the first protection film 23, the roll-to-roll production is also possible.
  • the absorption axis 12 of the second polarizer 11 close to the backlight unit is in the horizontal direction, a person who wears the polarizing sunglass cannot see the image.
  • general liquid crystal displays other than special purpose liquid crystal displays such as an advertisement liquid crystal display, etc., are manufactured in the form of 4:3 or 16:9. Therefore, when seen from a viewer of the display, the absorption axis of the second polarizer is in the vertical direction and the absorption axis of the first polarizer is in the horizontal direction.
  • a viewing angle compensation effect of the present invention can be described through a Poincare Sphere. Since the Poincare Sphere is a very useful tool to express the change of the polarization state at a predetermined angle, the Poincare Sphere can express the change of the polarization state when light irradiated at a predetermined viewing angle passes through optical elements in the liquid crystal display displaying the image by using polarization.
  • LCD ID (Sanayi System Co., Ltd, Korea), which is an LCD simulation system in the following first to tenth examples and the first to sixth comparative examples.
  • the second protection film 13, the second polarizer 11, the second compensation film 14, the blue phase liquid crystal cell 30, the first compensation film 24, the first polarizer 21, and the first protection film 23 are disposed, in which the absorption axis 12 of the second polarizer 11 is in the vertical direction when seen from the display side and the absorption axis 22 of the first polarizer 21 is in the horizontal direction.
  • the absorption axes 12 and 22 of the first and second polarizers 21 and 11 are perpendicular to each other, the slow axis 25 of the first compensation film 24 and the absorption axis 22 of the first polarizer 21 are parallel to each other, and the slow axis 15 of the second compensation film 14 and the absorption axis 12 of the second polarizer 11 are perpendicular to each other.
  • each optical film and the backlight unit used in the first example have the following optical properties.
  • the first and the second polarizers 11 and 21 are provided with polarizing function by dyeing an extended PVA with iodine and the polarizing performance of the polarizers having a 99.9% or more luminance degree of polarization and 41% or more luminance group transmittance within a visible light region of 370 to 780nm.
  • the luminance degree of polarization and the luminance group transmittance are defined by the following Formulae 4 to 8, when transmittance of the transmittance axis according to a wavelength is TD( ⁇ ), transmittance of the absorption axis according to a wavelength is MD( ⁇ ), and luminance compensation value defined in JIS Z 8701:1999 is v ( ⁇ )
  • T m K $( ⁇ )y( ⁇ ) TD( ⁇ )d ⁇ m
  • TAC TriAcetyl Cellulose film having an optical property of a thickness retardation (Rth) of 50nm with respect to incident light of 589.3nm was used for each of the first and the second protection films 23 and 13 to protect the first and the second polarizers.
  • Rth thickness retardation
  • FIG. 7 By performing a simulation of transmittance from all light directions after stacking optical components, as shown in FIG. l(a), the result shown in FIG. 7 is acquired.
  • a polarization state when passing through the second polarizer 11 on the Poincare Sphere is represented by 1
  • a polarization state when passing through the second compensation film 14 and a polarization state when passing through the liquid crystal cell are represented by 2
  • a polarization state when passing through the first compensation film 24 is represented by 3.
  • FIG. 7 shows the distribution of transmittance from all light directions when a black state is displayed on the screen, in which the transmittance is 0% to 0.05%, the portion exceeding 0.05% transmittance is shown by red color and low-transmittance portion is shown by blue color when the black state is shown, in the range of the scale.
  • the wider the blue portion at the center the easier it is to ensure a wider viewing angle by indicating the wider viewing angle.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of 6.9 and the first compensation film 24 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of 6.9
  • the first compensation film 24 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • FIG. 10 shows the distribution of transmittance from all light directions when a black state is displayed on the screen, in which the transmittance is 0% to 0.05%, the portion exceeding 0.05% transmittance is shown by red color and low-transmittance portion is shown by blue color when the black state is shown, in the range of the scale. In this case, it can be seen that the wider the blue portion at the center, the easier it is to ensure a wider viewing angle by displaying the viewing angle.
  • FIG. 9 showing transmittance from all light directions when a polarizing plate for the in-plane switching liquid crystal display (I Plus Pol configuration, DONGWOO FINE-CHEM, Korea) is applied to the liquid crystal mode of the present invention.
  • FIG. 11 shows an optical compensation principle of the second example on the Poincare Sphere
  • FIG. 8 shows an optical compensation principle of the first example on the Poincare Sphere.
  • innumerable com- pensable paths are present between two paths on the Poincare Sphere and the optical properties are not improved by only the first and second compensation films 14 and 24 but the optimal optical properties of the first compensation film 24 are determined depending on the optical properties of the second compensation film 14.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of 1.1 and the first compensation film 24 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of 1.1
  • the first compensation film 24 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • FIG. 12 shows the distribution of transmittance from all light directions when a black state is displayed on the screen. In this figure, it can be seen that the wide viewing angle can be ensured.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of 6.9 and the first compensation film 24 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of -0.11 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of 6.9
  • the first compensation film 24 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of -0.11 at a wavelength of 589.3nm.
  • FIG. 14 shows the distribution of transmittance from all light directions when a black state is displayed on the screen. In this figure, it can be seen that the wide viewing angle can be ensured.
  • the first protection film 23, the first polarizer 21, the first compensation film 24, the blue phase liquid cell 30, the second compensation film 14, the second polarizer 11, and the second protection film 13 are disposed as shown in FIG. l(b).
  • the absorption axis 22 of the first polarizer 21 is in the vertical direction when seen from the display side and the absorption axis 12 of the second polarizer 11 is in the horizontal direction when seen from the display side.
  • the absorption axes 22 and 12 of the first and second polarizers 21 and 11 are perpendicular to each other
  • the slow axis 15 of the second compensation film 14 is perpendicular to the absorption axis 12 of the second polarizer 11
  • the slow axis 25 of the first compensation film 24 and the absorption axis 22 of the first polarizer 21 are parallel to each other.
  • FIG. 16 By performing a simulation of transmittance from all light directions after stacking optical components, as shown in FIG. l(b), the result shown in FIG. 16 is acquired.
  • a polarization state when passing through the first polarizer 21 on the Poincare Sphere is represented by 1
  • a polarization state when passing through the first compensation film 24 and a polarization state when passing through the liquid crystal cell are represented by 2
  • a polarization state when passing through the second compensation film 14 is represented by 3.
  • FIG. 16 shows the distribution of transmittance from all light directions when a black state is displayed on the screen, in which the transmittance is 0% to 0.05%, the portion exceeding 0.05% transmittance is shown by red color and low-transmittance portion is shown by blue color when the black state is shown, in the range of the scale. In this case, it can be seen that the wider the blue portion at the center, the easier it is to ensure a wider viewing angle by indicating the wider viewing angle.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of 6.9 and the first compensation film 24 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of 6.9
  • the first compensation film 24 having an in-plane retardation (RO) of 35nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • FIG. 18 shows the distribution of transmittance from all light directions when a black state is displayed on the screen. In this figure, it can be seen that the wide viewing angle can be ensured.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of 1.1 and the first compensation film 24 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of 1.1
  • the first compensation film 24 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of -5.9 at a wavelength of 589.3nm.
  • FIG. 20 shows the distribution of transmittance from all light directions when a black state is displayed on the screen. In this figure, it can be seen that the wide viewing angle can be ensured.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of 6.9 and the first compensation film 24 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of -0.11 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 17nm and a refractive index ratio (NZ) of 6.9
  • the first compensation film 24 having an in-plane retardation (RO) of 129nm and a refractive index ratio (NZ) of -0.11 at a wavelength of 589.3nm.
  • FIG. 22 shows the distribution of transmittance from all light directions when a black state is displayed on the screen. In this figure, it can be seen that the wide viewing angle can be ensured.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 49nm and a refractive index ratio (NZ) of 3 and the first compensation film 24 having an in-plane retardation (RO) of 49nm and a refractive index ratio (NZ) of -1.9 at a wavelength of 589.3nm.
  • FIG. 24 shows the distribution of transmittance from all light directions when a black state is displayed on the screen. In this figure, it can be seen that the wide viewing angle can be ensured.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 60nm and a refractive index ratio (NZ) of 2 and the first compensation film 24 having an in-plane retardation (RO) of 60nm and a refractive index ratio (NZ) of -0.9 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 60nm and a refractive index ratio (NZ) of 2
  • the first compensation film 24 having an in-plane retardation (RO) of 60nm and a refractive index ratio (NZ) of -0.9 at a wavelength of 589.3nm.
  • FIG. 26 shows the distribution of transmittance from all light directions when a black state is displayed on the screen. In this figure, it can be seen that the wide viewing angle can be ensured.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 and the first compensation film 24 having optical properties of a general TAC (an in-plane retardation (RO) of 2nm and a thickness retardation (Rth) of 52nm).
  • a general TAC an in-plane retardation (RO) of 2nm and a thickness retardation (Rth) of 52nm.
  • FIG. 28 The simulation result of the transmittance from all light directions of the liquid crystal display is shown in FIG. 28. As shown in FIG. 28 below, it can be seen that since the transmittance of an inclined surface is high in the black state, the viewing angle is narrow.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the first and second compensation films 14 and 24 (an in-plane retardation (RO) of lnm and a thickness retardation (Rth) of 2nm) having 0-TAC used in a low-price in-plane switching liquid crystal display.
  • RO in-plane retardation
  • Rth thickness retardation
  • FIG. 29 The simulation result of the transmittance from all light directions of the liquid crystal display is shown in FIG. 29. As shown in FIG. 29 below, it can be seen that since the transmittance of an inclined surface is high in the black state, the viewing angle is narrow.
  • a blue phase liquid crystal display is manufacturing by arranging the slow axis 25 of the first compensation film 24 and the absorption axis 22 of the first polarizer 21 to be perpendicular to each other.
  • FIG. 30 The simulation result of the transmittance from all light directions of the liquid crystal display is shown in FIG. 30. As shown in FIG. 30 below, it can be seen that since the transmittance of an inclined surface is high in the black state, the viewing angle is narrow.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of 80nm and a refractive index ratio (NZ) of 1.1 and the first compensation film 24 having an in-plane retardation (RO) of 150nm and a refractive index ratio (NZ) of -0.1 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of 80nm and a refractive index ratio (NZ) of 1.1
  • the first compensation film 24 having an in-plane retardation (RO) of 150nm and a refractive index ratio (NZ) of -0.1 at a wavelength of 589.3nm.
  • FIG. 31 The simulation result of the transmittance from all light directions of the liquid crystal display is shown in FIG. 31. As shown in FIG. 31 below, it can be seen that since the transmittance of an inclined surface is high in the black state, the viewing angle is narrow.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of IOnm and a refractive index ratio (NZ) of 8.0 and the first compensation film 24 having an in-plane retardation (RO) of 55nm and a refractive index ratio (NZ) of -6.0 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of IOnm and a refractive index ratio (NZ) of 8.0
  • the first compensation film 24 having an in-plane retardation (RO) of 55nm and a refractive index ratio (NZ) of -6.0 at a wavelength of 589.3nm.
  • FIG. 32 The simulation result of the transmittance from all light directions of the liquid crystal display is shown in FIG. 32. As shown in FIG. 32 below, it can be seen that since the transmittance of an inclined surface is high in the black state, the viewing angle is narrow.
  • the liquid crystal display for the blue phase liquid crystal is manufactured by using the second compensation film 14 having an in-plane retardation (RO) of lOOnm and a refractive index ratio (NZ) of 5.0 and the first compensation film 24 having an in-plane retardation (RO) of IOnm and a refractive index ratio (NZ) of -7.0 at a wavelength of 589.3nm.
  • the second compensation film 14 having an in-plane retardation (RO) of lOOnm and a refractive index ratio (NZ) of 5.0
  • the first compensation film 24 having an in-plane retardation (RO) of IOnm and a refractive index ratio (NZ) of -7.0 at a wavelength of 589.3nm.
  • FIG. 33 The simulation result of the transmittance from all light directions of the liquid crystal display is shown in FIG. 33. As shown in FIG. 33 below, it can be seen that since the transmittance of an inclined surface is high in the black state, the viewing angle is narrow.
  • a liquid crystal display for a blue phase liquid crystal according to the present invention can be applied to a large-screen liquid crystal display requiring a high optical level because it can provide a wide viewing angle.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un assemblage de plaques polarisantes couplées comprenant une première et une seconde plaque polarisante couplées dans lesquelles des films de compensation présentant des propriétés optiques spécifiques sont stratifiés, ainsi qu'un affichage à cristaux liquides. L'assemblage de plaques polarisantes couplées de l'invention se prête facilement à la production en série tout en garantissant un angle de visualisation étendu égal ou supérieur à celui aux assemblages connus de l'art antérieur grâce à l'adoption, par l'assemblage de plaques polarisantes couplées, d'un mode de cristaux liquides à phase bleue.
PCT/KR2010/002791 2009-05-04 2010-05-03 Assemblage de plaques polarisantes couplées et affichage à cristaux liquides à mode phase bleue comportant cet assemblage Ceased WO2010128779A2 (fr)

Priority Applications (2)

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CN2010800196619A CN102414588A (zh) 2009-05-04 2010-05-03 耦合偏光板组件和包括该组件的蓝相液晶模式液晶显示器
JP2012509725A JP5602221B2 (ja) 2009-05-04 2010-05-03 液晶表示装置

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KR10-2009-0038904 2009-05-04
KR1020090038904A KR101632610B1 (ko) 2009-05-04 2009-05-04 복합구성 편광판 세트 및 이를 포함하는 푸른 상 액정모드 액정표시장치

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WO2010128779A2 true WO2010128779A2 (fr) 2010-11-11
WO2010128779A3 WO2010128779A3 (fr) 2011-01-20
WO2010128779A9 WO2010128779A9 (fr) 2011-03-10

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CN103235447B (zh) 2013-03-25 2016-01-06 京东方科技集团股份有限公司 光学补偿膜、光学补偿偏光板及液晶显示装置
JP6437854B2 (ja) * 2015-03-17 2018-12-12 日東電工株式会社 液晶パネルおよび液晶表示装置
US10804500B2 (en) 2016-10-14 2020-10-13 Lg Chem, Ltd. Optical filter for anti-reflection and organic light-emitting device
WO2019169170A1 (fr) * 2018-03-02 2019-09-06 Sharp Gary D Paires de piles de retardateurs pour transformations de vecteur de base de polarisation
JP6896118B1 (ja) * 2020-01-23 2021-06-30 日東電工株式会社 液晶表示装置

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KR101029933B1 (ko) * 2002-11-02 2011-04-18 메르크 파텐트 게엠베하 광학 등방성 상을 갖는 광학적으로 보정된 전기-광학 광변조 소자
KR100677050B1 (ko) * 2003-10-22 2007-01-31 주식회사 엘지화학 ＋ａ-플레이트와 ＋ｃ-플레이트를 이용한 시야각보상필름을 포함하는 면상 스위칭 액정 표시장치
KR100601916B1 (ko) * 2003-11-21 2006-07-14 주식회사 엘지화학 양의 이축성 위상차 필름을 이용한 시야각 보상필름을포함하는 면상 스위칭 액정 표시장치
TWI268372B (en) * 2004-03-26 2006-12-11 Nitto Denko Corp IPS mode liquid crystal display to realize a high contrast ratio over a wide range by laminating a polarizing plate and a retardation film to form an optical film
WO2005116741A1 (fr) * 2004-05-26 2005-12-08 Nitto Denko Corporation Affichage à cristaux liquides
JP4642493B2 (ja) * 2005-01-31 2011-03-02 Ｎｅｃ液晶テクノロジー株式会社 液晶表示装置
JP5311605B2 (ja) * 2005-06-30 2013-10-09 日東電工株式会社 液晶パネルおよび液晶表示装置
KR20080067041A (ko) * 2007-01-15 2008-07-18 삼성전자주식회사 반투과형 액정 표시 패널
JP4878306B2 (ja) * 2007-02-09 2012-02-15 株式会社 日立ディスプレイズ 液晶表示装置
JP2008197192A (ja) * 2007-02-09 2008-08-28 Hitachi Displays Ltd 液晶表示装置
JP4479928B2 (ja) * 2007-06-15 2010-06-09 株式会社 日立ディスプレイズ 液晶表示装置
KR100877926B1 (ko) * 2008-02-20 2009-01-12 동우 화인켐 주식회사 네거티브 ｃ 및 네거티브 이축성 플레이트 조합된 위상차필름 및 그 위상차 필름들을 구비한 수직배향 액정표시장치
EP2259131B1 (fr) * 2008-04-07 2012-06-20 Sharp Kabushiki Kaisha Dispositif d'affichage à cristaux liquides

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KR101632610B1 (ko) 2016-06-22
TW201040595A (en) 2010-11-16
TWI495912B (zh) 2015-08-11
JP5602221B2 (ja) 2014-10-08
JP2012526298A (ja) 2012-10-25
KR20100119968A (ko) 2010-11-12
CN102414588A (zh) 2012-04-11
WO2010128779A3 (fr) 2011-01-20
WO2010128779A9 (fr) 2011-03-10

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