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WO2008053592A1 - Film de diffusion de lumière anisotrope, ainsi que dispositif d'affichage et dispositif d'affichage à cristaux liquides utilisant ce même film - Google Patents

Film de diffusion de lumière anisotrope, ainsi que dispositif d'affichage et dispositif d'affichage à cristaux liquides utilisant ce même film Download PDF

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Publication number
WO2008053592A1
WO2008053592A1 PCT/JP2007/001185 JP2007001185W WO2008053592A1 WO 2008053592 A1 WO2008053592 A1 WO 2008053592A1 JP 2007001185 W JP2007001185 W JP 2007001185W WO 2008053592 A1 WO2008053592 A1 WO 2008053592A1
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WIPO (PCT)
Prior art keywords
anisotropic light
light diffusing
liquid crystal
display device
crystal display
Prior art date
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Ceased
Application number
PCT/JP2007/001185
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English (en)
Japanese (ja)
Inventor
Kensaku Higashi
Yasuhiko Motoda
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Tomoegawa Co Ltd
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Tomoegawa Paper Co Ltd
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Filing date
Publication date
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Publication of WO2008053592A1 publication Critical patent/WO2008053592A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0257—Diffusing elements; Afocal elements characterised by the diffusing properties creating an anisotropic diffusion characteristic, i.e. distributing output differently in two perpendicular axes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements

Definitions

  • Anisotropic light diffusing film display device using the same, and liquid crystal display device
  • the present invention relates to an anisotropic light diffusion film capable of expanding a viewing angle, a display device using the same, and a liquid crystal display device.
  • Examples of the display device that can be used include a liquid crystal display panel, a plasma display panel (PDP), an organic electroluminescence panel (EL), a rear projector, and a field emission display. It is done. Among these, liquid crystal display devices using liquid crystal display panels are used in many products.
  • nematic liquid crystal is sandwiched between a pair of transparent glass substrates on which transparent electrodes are formed, and a pair of polarizing plates is provided on both sides of the glass substrate. It is the structure which was made.
  • the display direction is good with respect to the normal direction of the liquid crystal display panel, the vertical or horizontal direction with respect to the normal line of the liquid crystal display panel
  • the display characteristic is remarkably deteriorated in a direction inclined more than a specific angle.
  • a plurality of refractive index distribution type microlenses formed by reaction of a photopolymerizable monomer are formed in a transparent polymer substrate.
  • a microlens array is disclosed in which the viewing angle of a liquid crystal display device can be expanded by having a region of (see, for example, Patent Document 1). . )
  • a bundle of many glass fibers is thinly cut at a surface where the optical axis of the fiber is inclined at a specific angle with respect to the normal of the fiber plate.
  • a liquid crystal display device in which the emitted light has directivity by being laminated as a glass substrate on the side is disclosed (for example, see Patent Document 2).
  • the resin layer made of a cured product of a composition containing a photopolymerizable compound, all in a predetermined direction P
  • An anisotropic diffusion film in which an aggregate of a plurality of bar-shaped hardened regions extending in parallel is disclosed (see, for example, Patent Document 3). It is known that this anisotropic diffusion film can slightly improve the viewing angle by being applied to the viewing surface side of a liquid crystal display device.
  • photopolymerization and “curing” will be used as the photopolymerizable compound undergoes a polymerization reaction with light, and both are used interchangeably.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 6_59 10 2
  • Patent Document 2 JP-A-6-2 5 8 6 2 7
  • Patent Document 3 Japanese Patent Laid-Open No. 2 0 0 _ 2 6 5 9 1 5
  • an object of the present invention is to provide an anisotropic light diffusion film capable of sufficiently expanding the viewing angle of a display panel, particularly a liquid crystal display panel, in an arbitrary direction, and a liquid crystal display device using the same.
  • the present inventor has determined that the transmission diffusibility of incident light is anisotropic light diffusion.
  • the scattering central axis projected on the surface of the anisotropic light diffusing layer has an incident angle dependency that changes depending on the angle at which the scattering central axis of the scattering layer intersects the optical axis of the incident light to the anisotropic light diffusing layer.
  • the anisotropic light diffusing film of the present invention comprises a plurality of anisotropic light diffusing layers made of a cured product of a composition containing a photopolymerizable compound, and each of the anisotropic light diffusing layers has one scattering center axis,
  • the transmission diffusivity of incident light to the anisotropic light diffusing layer has an incident angle dependency that changes depending on the angle at which the scattering central axis of the anisotropic light diffusing layer and the optical axis of the incident light intersect.
  • the direction of the scattering central axis differs depending on each anisotropic light diffusion layer.
  • [001 1] According to the present invention, by stacking a plurality of anisotropic light diffusing layers having different scattering center axes, light emitted from a display panel, particularly a liquid crystal display panel, is distributed in a direction around a plurality of scattering center axes. As a result, the viewing angle of the display panel including the liquid crystal display panel can be sufficiently expanded in an arbitrary direction.
  • the anisotropic light diffusing layer in the anisotropic light diffusing film of the present invention has an assembly of a plurality of rod-like hardened regions 3 in the anisotropic light diffusing layer 1, and a scattering center in the length direction.
  • the plurality of rod-shaped hardened regions 3 are formed so as to be parallel to the axis P, and the refractive index is different from the periphery thereof.
  • the viewing angle is expanded in a direction that is parallel to the direction in which the scattering center axis P is projected onto the surface of the anisotropic light diffusion layer, and the emitted light is diffused around the scattering center axis. Then, by performing this action with a plurality of anisotropic light diffusion layers, the light emitted from the display panel including the liquid crystal display panel is distributed and diffused around a plurality of scattering central axes. Can do.
  • light directed in a direction different from the direction in which the scattering center axis P is projected onto the surface of the anisotropic light diffusion layer is further directed to another direction by the plurality of anisotropic light diffusion layers.
  • the viewing angle of a display panel including a liquid crystal display panel be sufficiently expanded in any direction by adjusting the scattering center axis, but also in a direction different from the direction in which the scattering center axis is directed. Can be expanded up to the viewing angle.
  • FIG. 1 is a diagram schematically showing an example of an anisotropic light diffusion film of the present invention.
  • FIG. 2 is a view schematically showing an anisotropic light diffusion layer in the present invention.
  • FIG. 3 is a three-dimensional polar coordinate display for explaining the scattering center axis in the present invention.
  • FIG. 4 is a diagram schematically showing an example of a liquid crystal display device of the present invention.
  • FIG. 5 is a diagram schematically showing another example of the liquid crystal display device of the present invention.
  • FIG. 6 is a schematic diagram showing a conventional light control plate.
  • FIG. 7 is a diagram showing that the anisotropic light diffusion film of the present invention can expand the luminance of the backlight in an arbitrary direction.
  • the anisotropic light diffusing film of the present invention has, for example, a configuration in which a plurality of anisotropic light diffusing layers 1 are laminated with an adhesive 2 as shown in FIG.
  • an adhesive 2 for the pressure-sensitive adhesive layer 2, generally known adhesives and pressure-sensitive adhesives are appropriately used.
  • the anisotropic light diffusing layer in the present invention is made of a cured product of a composition containing a photopolymerizable compound, and an assembly of a plurality of rod-shaped cured regions is parallel to the scattering central axis in the length direction. It is formed as follows.
  • a composition containing a photopolymerizable compound is provided in a sheet form, and a light beam parallel to the desired scattering center axis P is irradiated from a light source to the sheet, and the composition is cured.
  • the length direction of the rod-shaped region aggregate and the scattering center axis are parallel as long as they satisfy the law of refractive index (S ne II's law) and are strictly parallel. There is no need.
  • the aggregate of rod-shaped cured regions referred to in the present invention is schematically shown in Fig. 2, but a large number of rod-shaped or columnar cured regions have their length directions parallel to the scattering center axis.
  • the rod shape is estimated from the irradiation light source and the cross section is schematically shown in a circular shape in FIG. 2, it is formed in a rod shape parallel to the scattering center axis.
  • the cross-sectional shape is not particularly limited, such as a circular shape, a polygonal shape, or an indefinite shape.
  • the scattering central axis P in the present invention has a polar angle of 0 when the anisotropic light diffusion layer surface is the X y plane and the normal is the z axis. It can be expressed by the azimuth angle ⁇ . That is, P xy in FIG. 3 can be said to be the length direction of the scattering central axis projected onto the surface of the anisotropic light diffusion layer.
  • the viewing angle of a display panel including a liquid crystal display panel can be sufficiently enlarged if the azimuth angle ⁇ in at least a plurality of anisotropic light diffusing layers is different.
  • the polar angle 0 of the scattering center angle P is preferably 10 to 60 °, more preferably 30 to 45 °. If the polar angle 0 is less than 10 °, the viewing angle of the display panel including the liquid crystal display panel cannot be expanded sufficiently. -On the other hand, if the polar angle 0 exceeds 60 °, it is necessary to irradiate the composition containing the photopolymerizable compound provided in the form of a sheet in the manufacturing process from a deep inclination, and the absorption efficiency of the irradiated light is increased. Since it is bad and disadvantageous in manufacture, it is not preferable.
  • the anisotropic light diffusing film of the present invention is formed by laminating a plurality of anisotropic light diffusing layers made of a cured product of a composition containing a photopolymerizable compound.
  • the laminated body is formed on a transparent substrate. It is also possible to adopt a configuration in which a transparent substrate is laminated on both sides of the laminated body.
  • the transparent substrate the higher the transparency, the better, and the total light transmittance (JIS K736 1-1) is 80% or more, more preferably 85 ⁇ 1 ⁇ 2 or more, most preferably 90 ⁇ 1 ⁇ 2 or more.
  • haze value JISK 7 1366
  • a plastic film is preferred because it is thin, light, difficult to break, and has excellent productivity.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • TAC triacetyl cellulose
  • PC polystrength Ponate
  • PC polyester sulphone
  • P ES polyester sulphone
  • cellophane polyethylene
  • PE Polypropylene
  • PP polyvinyl alcohol
  • PVA cycloolefin resin and the like
  • the thickness of the substrate is 1 m to 5 mm, preferably 10 to 500; Um, more preferably 50 to 15 in consideration of use and productivity.
  • the anisotropic light diffusing film of the present invention includes an anisotropic light diffusing layer obtained by curing a composition containing a photopolymerizable compound, and the following combinations can be used as this composition. .
  • the refractive index change and the difference in refractive index specifically indicate a change or difference of 0.11 or more, preferably 0.05 or more, more preferably 0.110 or more. is there.
  • the photopolymerizable compound which is an essential material for forming the anisotropic light diffusion layer of the present invention, is a photopolymerization selected from a polymer having a radically polymerizable or cationically polymerizable functional group, an oligomer, and a monomer. It is a material that is composed of an organic compound and a photoinitiator, and is polymerized and cured by irradiation with ultraviolet rays and visible light.
  • the radical polymerizable compound mainly contains one or more unsaturated double bonds in the molecule, and specifically includes epoxy acrylate, urethane acrylate, polyester acrylate, poly Acryl oligomers called ether acrylates, polybutadiene acrylates, silicone acrylates, and 2-ethyl hexyl acrylate, isoamyl acrylate, butoxy shetyl acrylate, ethoxydiethylene glycol acrylate , Phenoxychetyl acrylate, Tetrahydrofurfuryl acrylate, Isonol phenyl acrylate, 2-Hydroxyethyl acrylate, 2-Hydroxypropyl acrylate, 2-Acryloyl oxyphthalic acid, Dicyclopentenyl Acrylate, triethyleneglycol Rudiacrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, EO adduct of bis
  • the cationically polymerizable compound includes an epoxy group and a vinyl ether group in the molecule.
  • a compound having one or more oxetane groups can be used.
  • Compounds having an epoxy group include 2-ethylhexyl diglycol glycidyl ether, biphenyl glycidyl ether, bisphenol A, hydrogenated bisphenol A, bisphenol F, bisphenol AD, bisphenol S, tetramethyl.
  • Diglycidyl ethers of bisphenols such as Rubisphenol A, Tetramethylbisphenol ", Tetrachlorobisphenol 8, Tetrabromobisphenol A, Phenolic nopolac, Cresolol nopolac, Bromo ⁇ Polyglycidyl ethers of nopolak resins such as nornolacol and orthocresol nopolac, ethylene glycol, polyethylene glycol, polypropylene glycol, butanediol, 1,6-hexanediol, neopentyl glycol Diglycidyl ethers of alkylene glycols such as trimethylolpropane, 1,4-cyclohexanedimethanol, EO adduct of bisphenol A, PO adduct of bisphenol A, glycidyl esters and dimers of hexahydrophthalic acid Examples thereof include glycidyl esters such as diglycidyl ester of acid.
  • Examples of the compound having a vinyl ether group include diethylene glycol divinyl ether, triethylene glycol divinyl ether, butanediol divinyl ether, hexanediol divinyl ether, cyclohexanedimethanol divinyl ether. Ter, hydroxy butyl vinyl ter, ethyl vinyl ter, dodecyl vinyl ter, trimethylol propane trivinyl ether, propenyl ether propylene, etc. It is not limited.
  • the vinyl ether compound is generally cationically polymerizable but can be radically polymerized by combining with acrylate.
  • the above cationically polymerizable compounds may be used alone or in combination.
  • the photopolymerizable compound is not limited to the above.
  • the photopolymerizable compound may be introduced with fluorine atoms (F) in order to reduce the refractive index, and in order to increase the refractive index.
  • F fluorine atoms
  • S sulfur atom
  • Br bromine atom
  • various metal atoms may be introduced.
  • Special Table 2 0 0 5— 5 1 4 4 8 7 such as titanium oxide (T i 0 2 ), zirconium oxide (Z r 0 2 ), tin oxide (S n O x ), etc.
  • Photoinitiators capable of polymerizing radically polymerizable compounds include benzophenone, benzyl, Michler's ketone, 2-chlorodithioxanthone, 2,4-diethylthioxanthone, benzoinethyl ether, benzoinisopropyl Ether, benzoin isobutyl ether, 2, 2-ethoxy Acetophenone, benzyldimethyl ketal, 2,2-dimethoxy-1,2-diphenylethane_1_one, 2-hydroxy-2-methyl-1,1-phenylpropane-1-one, 1-hydroxycyclohexyl phenyl ketone , 2 —Methyl mono 1_ [4— (Methylthio) phenyl] _2_morpholinopropanone _1, 11 [41 (2-hydroxyethoxy) -phenyl] _2—hydroxy 2-methyl-1-propan _1 _one Bis (cyclopentadien
  • the photoinitiator of a cationic polymerizable compound is a compound that generates an acid by light irradiation and can polymerize the above cationic polymerizable compound by the generated acid.
  • Mouthcene complexes are preferably used.
  • Dionium salts, sulfonium salts, sodium salts, phosphonium salts, selenium salts, etc. are used as onium salts, and these counter ions include BF 4 _, PF 6 _, A s F 6 _, S b F 6 Anions such as _ are used.
  • Specific examples include 4-chlorobenzene benzene hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium hexafluorophosphate, ( (4-phenylthiophenyl) diphenylsulfonium hexafluoroantimonate, (41-phenylthiophenyl) diphenylsulfonium hexafluorophosphate, bis [41- (diphenylsulfonio ) Phenyl] sulfi dobis monohexafluoroanmonate, bis [41 (diphenylsulfonio) phenyl] sulfido monobis monohexafluorophosphate, (4-methoxyphenyl) diphenylsulfonhexaful Oloantimonate, (4-methoxyphenyl) phenfluorohexafluoroanti Ne
  • the photoinitiator is 0.01 to 10 parts by weight, preferably 0.1 to 7 parts by weight, more preferably 0 to 100 parts by weight of the photopolymerizable compound. About 1 to 5 parts by weight are blended. This is because if less than 0.1 part by weight, the photocuring property is lowered, and if more than 10 parts by weight is blended, only the surface is cured and the internal curability is lowered. Because it comes.
  • These photoinitiators are usually used by directly dissolving a powder in a photopolymerizable compound, but if the solubility is poor, a photoinitiator dissolved in a very small amount of solvent in advance at a high concentration is used. It can also be used.
  • Such a solvent is more preferably photopolymerizable, and specific examples thereof include propylene carbonate, and r-peptilolactone. It is also possible to add various known dyes and sensitizers in order to improve photopolymerization. Further, a thermosetting initiator capable of curing the photopolymerizable compound by heating can be used in combination with the photoinitiator. In this case, by heating after photocuring, it can be expected that polymerization curing of the photopolymerizable compound is further promoted and completed.
  • an anisotropic light diffusing layer can be formed by curing the above-mentioned photopolymerizable compound alone or by mixing a mixture of a plurality thereof.
  • the anisotropic light diffusion layer of the present invention can also be formed by curing a mixture of a photopolymerizable compound and a polymer resin that does not have photocurability.
  • Polymer resins that can be used here include acrylic resin, styrene resin, styrene-acrylic copolymer, polyurethane resin, polyester resin, epoxy resin, cellulose resin, vinyl acetate resin, and vinyl chloride vinyl chloride copolymer. And polyvinyl ptylal resin.
  • polymer resins and photopolymerizable compounds must have sufficient compatibility before photocuring, but various organic solvents must be used to ensure this compatibility. It is also possible to use an agent or a plasticizer.
  • acrylate is used as the photopolymerizable compound, it is preferable from the viewpoint of compatibility that the polymer resin is selected from acryl resins.
  • the anisotropic light diffusing film of the present invention is provided with a composition containing the above-mentioned photopolymerizable compound in a sheet form, and a light beam parallel to the desired scattering center axis P is irradiated from the light source to the sheet. And is produced by curing the composition.
  • a method of providing the composition containing the photopolymerizable compound in a sheet form on the substrate a normal coating method or printing method is applied.
  • air coating, bar coating, blade coating, knife coating, river coating, transfer coating, gravure mouth coating, kisco coating, cast coating Coating, spray coating, slot orifice coating, calendar coating, dam coating, dip coating, die coating, etc., intaglio printing such as gravure printing, stencil printing such as screen printing, etc. can be used.
  • a weir of a certain height can be provided around the substrate, and the composition can be cast inside the weir.
  • a short arc ultraviolet light source is usually used. Specifically, a high pressure mercury lamp, a low pressure mercury lamp Metahalide lamps, xenon lamps, etc. can be used. Note that a light source having a rod-like light emitting surface is inappropriate in the present invention. When such a rod-shaped light source is used, a plate-like hardened region is formed, resulting in the conventional light diffusion medium shown in FIG. In the present invention, it is necessary to irradiate the composition containing the photopolymerizable compound formed in the form of a sheet with a light beam parallel to the desired scattering center axis P. Is preferably used. In addition, when producing a small size, it is possible to irradiate from a sufficiently long distance using an ultraviolet spot light source.
  • the light applied to the sheet of the composition containing the photopolymerizable compound needs to have a wavelength capable of curing the photopolymerizable compound, and is usually a mercury lamp. Light with a wavelength centering around 365 nm is used.
  • the illuminance is preferably in the range of 0.01 to 1 OO mW / cm 2 , more preferably 0.1 to 20. it is in the range of mW / cm 2. Illuminance 0.
  • Such transmitted light intensity distribution type masks can be produced by vapor deposition, printing, or coating.
  • a display device is applicable as long as the display performance has a viewing angle dependency.
  • Examples of the display device that can be used include a liquid crystal display panel, a PDP panel, an organic EL panel, a rear projector, a field emission display, and the like.
  • the viewing performance depends on the viewing angle. When viewing from the front direction (normal direction of the viewing surface of the display device, viewing angle 0 °) and oblique viewing (direction larger than viewing angle 0 °) This means that the display performance such as contrast ratio, gradation characteristics, and chromaticity is different, and the brightness changes greatly.
  • the liquid crystal display device has a configuration in which the above-described anisotropic light diffusion film is provided on the outgoing light side of the liquid crystal display panel.
  • a nematic liquid crystal 13 is sandwiched between a pair of transparent glass substrates 11 and 12 on which transparent electrodes are formed, and a pair of glass substrates 11 and 12 are placed on both sides.
  • the anisotropic light diffusion film 10 is placed on the polarizing plate 14 or between the glass substrate 11 and the polarizing plate 14. This is a configuration provided.
  • transparent glass substrate nematic liquid crystal, polarizing plate, etc., generally known ones can be used.
  • a partition wall with a height of 0.5 mm was formed with a curable resin using a dispenser on the entire periphery of the 76 x 26 mm size slide glass.
  • a composition containing the following photopolymerizable compound was dropped into this and covered with another slide glass.
  • Example 1 An anisotropic light diffusion film of Example 1 was produced by laminating two anisotropic light diffusion layers.
  • An anisotropic light diffusing film is not laminated 1.
  • An 8-inch color STN panel was used as the liquid crystal display device of Comparative Example 1.
  • a diffusion film BS _ 037 (manufactured by Keiwa) was used as the anisotropic light diffusing film of Comparative Example 3, and the liquid crystal display device of Comparative Example 3 was laminated on an 8-inch column STN panel. It was.
  • the tone reversal angle here refers to the angle at which tone reversal starts to occur when the screen is viewed from a position inclined with respect to the normal of the screen.
  • the viewing angle in this measurement was the maximum polar angle at which the contrast ratio represented by the ratio of white luminance to black luminance was 2 or more.
  • the presence or absence of image blur was also confirmed, and the results are shown in Table 1.
  • the viewing angle of the liquid crystal display device of Comparative Example 1 is 40 ° with respect to the vertical and diagonal directions and the horizontal direction, and the gradation inversion angles are vertical and diagonal and left and right. It was 50 ° to the direction.
  • the viewing angle of the liquid crystal display device of Comparative Example 2 is 40 ° in the vertical and diagonal directions, and the horizontal direction is 65 °.
  • the gradation inversion angle is 50 ° in the vertical and diagonal directions, and 75 in the horizontal direction. °.
  • the viewing angle of the liquid crystal display device of Comparative Example 3 was 50 ° in the vertical, diagonal, and horizontal directions, and the gradation inversion angle was 60 ° in the vertical, diagonal, and horizontal directions.
  • the viewing angle in the vertical, diagonal, and horizontal directions was 55 °
  • the gradation inversion angle was 65 ° in the vertical and diagonal directions. That is, the anisotropic light diffusing film and the liquid crystal display device of the present invention can expand the viewing angle by 15 ° with respect to the vertical, diagonal, and horizontal directions as compared with the conventional liquid crystal display device.
  • Z r (OP r) 4 65 Place 4 parts by weight in a 250 m I three-necked flask and ice bath Cooled in. While stirring this, 17.2 parts by weight of methacrylic acid (MAA) was gradually added dropwise over 15 minutes. The whole amount is added dropwise and stirred for another 10 minutes, and then the three-necked flask is removed from the ice bath and stirred at 25 ° C for another 10 minutes, Zr (OPr) 4 / MAA (1: 1) was prepared.
  • MAA methacrylic acid
  • the photopolymerizable composition prepared as described above was applied to provide a coating film having a dry film thickness of 50 m. Furthermore, a 38 m thick release PET film (trade name: 38 X, manufactured by Lintec) was laminated on this coating film, and parallel UV light was irradiated from above on a direction with an incident angle of 30 °. Thus, an anisotropic light diffusion film having a scattering central axis of 30 ° was produced.
  • Example 2 An anisotropic light diffusing film was prepared.
  • the anisotropic light diffusion layer having a diffusion center axis of 30 ° in Example 2 is
  • the anisotropic light diffusing film of Comparative Example 4 was produced by placing the azimuth of the light so that it coincides with the 0 ° direction of the light exit surface of the backlight (the horizontal right direction of the light exit surface).
  • a commercially available backlight was placed on a rotating table with its light emitting surface standing upright, and a luminance meter was placed in front of it.
  • the rotation table was intermittently rotated at 0 ° in the normal direction of the light exit surface, the luminance at each angle was measured, and the luminance distribution characteristic was measured only for the backlight with nothing on it.
  • the anisotropic light diffusing film of Example 2 was overlaid on the backlight so that the azimuth angle of the scattering center axis was 0 ° and 180 ° of the light exit surface of the backlight.
  • the luminance distribution characteristics were measured in the same manner as described above.
  • the anisotropic light diffusing film of Comparative Example 4 is arranged such that the azimuth angle of the scattering center axis thereof coincides with 0 ° (horizontal direction of the light exit surface) of the exit surface of the backlight.
  • the luminance distribution characteristics were measured in the same manner as described above.
  • each luminance in FIG. 7 is standardized assuming that the luminance in the 0 ° direction of the backlight is 100%, and the actual luminance data is shown in Table 2.
  • the anisotropic light diffusing film of the present invention shows that the luminance in the scattering central axis direction is improved, although the luminance in the front direction is slightly lowered.
  • the anisotropic light diffusing film of the present invention induces light in the front direction in the direction of the scattering center axis.
  • an anisotropic light diffusion film capable of sufficiently expanding the viewing angle of a display device, particularly a liquid crystal display panel, in an arbitrary direction, a display device using the same, and a liquid crystal display device are provided. be able to.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Elements Other Than Lenses (AREA)
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Abstract

Cette invention concerne un film de diffusion de lumière anisotrope comprenant une pluralité de couches de diffusion de lumière anisotrope empilées les unes sur les autres de manière à ce que la direction d'un axe central de diffusion varie en fonction de chaque couche de diffusion de lumière anisotrope. La couche de diffusion de lumière anisotrope est formée d'un produit durci d'une composition contenant un composé photopolymérisable. Chacune des couches de diffusion de lumière anisotrope possède une propriété transversale de diffusion de lumière incidente telle que chacune possède un axe central de diffusion et présente une dépendance en termes d'angle incident qui varie en fonction de l'angle auquel l'axe central de diffusion et l'axe de la lumière incidente se croisent.
PCT/JP2007/001185 2006-10-31 2007-10-30 Film de diffusion de lumière anisotrope, ainsi que dispositif d'affichage et dispositif d'affichage à cristaux liquides utilisant ce même film Ceased WO2008053592A1 (fr)

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JP2006-296868 2006-10-31
JP2006296868 2006-10-31

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WO2008053592A1 true WO2008053592A1 (fr) 2008-05-08

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JP2012141592A (ja) * 2010-12-15 2012-07-26 Lintec Corp 異方性光拡散フィルム用組成物および異方性光拡散フィルム
JP2012141593A (ja) * 2010-12-16 2012-07-26 Lintec Corp 光拡散フィルムおよび光拡散フィルムの製造方法
US9291851B2 (en) 2011-03-30 2016-03-22 Japan Display Inc. Display and electronic unit
JP2012208408A (ja) * 2011-03-30 2012-10-25 Japan Display West Co Ltd 表示装置および電子機器
EP2506066A3 (fr) * 2011-03-30 2013-12-25 Japan Display West Inc. Afficheur et unité électronique
US10191322B2 (en) 2011-03-30 2019-01-29 Japan Display Inc. Display and electronic unit
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CN105829924B (zh) * 2014-01-21 2018-10-19 株式会社巴川制纸所 各向异性光学膜
WO2015111523A1 (fr) * 2014-01-21 2015-07-30 株式会社巴川製紙所 Film optique anisotrope
JPWO2015111523A1 (ja) * 2014-01-21 2017-03-23 株式会社巴川製紙所 異方性光学フィルム
KR20160137964A (ko) * 2014-03-28 2016-12-02 가부시키가이샤 도모에가와 세이시쇼 이방성 광학 필름
CN106133588A (zh) * 2014-03-28 2016-11-16 株式会社巴川制纸所 各向异性光学膜
JP2015191178A (ja) * 2014-03-28 2015-11-02 株式会社巴川製紙所 異方性光学フィルム
CN106133588B (zh) * 2014-03-28 2019-08-23 株式会社巴川制纸所 各向异性光学膜
WO2015146708A1 (fr) * 2014-03-28 2015-10-01 株式会社巴川製紙所 Film optique anisotrope
KR102316118B1 (ko) * 2014-03-28 2021-10-25 가부시키가이샤 도모에가와 세이시쇼 이방성 광학 필름
CN108933157A (zh) * 2017-05-25 2018-12-04 乐金显示有限公司 有机发光显示装置
CN108933157B (zh) * 2017-05-25 2023-06-30 乐金显示有限公司 有机发光显示装置
JP6581329B1 (ja) * 2018-05-14 2019-09-25 株式会社巴川製紙所 ヘッドマウントディスプレイ
WO2019220775A1 (fr) * 2018-05-14 2019-11-21 株式会社巴川製紙所 Visiocasque
US11874481B2 (en) 2018-05-14 2024-01-16 Tomoegawa Co., Ltd. Head-mounted display

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