WO2011162132A1 - Plaque de polarisation de difusion de lumière et dispositif d'affichage à cristaux liquides - Google Patents

Plaque de polarisation de difusion de lumière et dispositif d'affichage à cristaux liquides Download PDF

Info

Publication number
WO2011162132A1
WO2011162132A1 PCT/JP2011/063606 JP2011063606W WO2011162132A1 WO 2011162132 A1 WO2011162132 A1 WO 2011162132A1 JP 2011063606 W JP2011063606 W JP 2011063606W WO 2011162132 A1 WO2011162132 A1 WO 2011162132A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
film
layer
resin
liquid crystal
Prior art date
Application number
PCT/JP2011/063606
Other languages
English (en)
Japanese (ja)
Inventor
康弘 羽場
誠治 室
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Publication of WO2011162132A1 publication Critical patent/WO2011162132A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—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
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape

Definitions

  • the present invention relates to a light diffusing polarizing plate and a liquid crystal display device using the same.
  • a liquid crystal display device includes a backlight device and a liquid crystal panel, and the liquid crystal panel is disposed on a liquid crystal cell, a back side polarizing plate disposed on a backlight side of the liquid crystal cell, and a viewing side of the liquid crystal cell.
  • the front side polarizing plate is included.
  • Patent Document 1 discloses a polarizing plate having a relatively high light diffusibility (“second light diffusion layer” in Patent Document 1) on the front side (viewing side) of a liquid crystal cell. Is disclosed).
  • This second light diffusing layer is, for example, a polarizing plate and a resin layer (light diffusing layer) provided on the front side of the polarizing plate and provided with a light diffusing function containing a relatively large amount of filler (light diffusing agent). ).
  • the liquid crystal display device for the purpose of further improving the visibility of the liquid crystal display device, it is possible to prevent or reduce external light from being reflected on the display surface on the outermost surface of the liquid crystal display device, that is, the outermost surface of the front-side polarizing plate.
  • an optical process such as an anti-glare process or an anti-reflection process for preventing or reducing reflection of external light incident on the display surface is performed.
  • the shape of the surface on which the optical treatment is performed needs to be precisely controlled.
  • the light diffusion layer containing a relatively large amount of filler such as the light diffusion layer of the front side polarizing plate described in Patent Document 1
  • an object of the present invention is to provide a new light diffusing polarizing plate which has a sufficient light diffusing property and which also exhibits another optical function and a liquid crystal display device using the same. is there.
  • the present invention includes a polarizing film, a light diffusing film laminated on the polarizing film, and a surface treatment film laminated on the light diffusing film, the light diffusing film having a light diffusing layer, Among the surfaces of the diffusion layer, the center line average roughness Ra of the surface closer to the surface treatment film is 0.1 ⁇ m or more and less than 1 ⁇ m, and the surface treatment film is a transparent resin in which one surface is optically treated.
  • a light diffusing polarizing plate which is formed from a film and in which a light diffusion layer and a surface treatment film are bonded to each other via an adhesive layer or an adhesive layer.
  • the surface treatment film has a surface not subjected to optical treatment, and the light diffusion layer and the surface not subjected to optical treatment of the surface treatment film are adhesive. It is preferable that the light diffusion layer and the surface treatment film are bonded to each other through an agent layer or an adhesive layer.
  • the optical treatment can be, for example, an antiglare treatment or an antireflection treatment.
  • the light diffusing film further includes a transparent base film, and the light diffusing layer is laminated on the transparent base film, and the light diffusing layer is dispersed in the translucent resin and the translucent resin. It is preferable that it contains a light-sensitive fine particle.
  • the light diffusion layer of such a light diffusion film can be formed by applying a resin liquid in which translucent fine particles are dispersed on a transparent substrate film.
  • the light diffusion layer is formed by applying a resin liquid in which translucent fine particles are dispersed on a transparent substrate film, and transferring a mirror surface or an uneven surface of a mold onto the surface of the layer formed from the resin liquid. It may be formed.
  • the present invention also provides a liquid crystal display device comprising a backlight device, a light diffusing means, a backlight side polarizing plate, a liquid crystal cell, and the light diffusing polarizing plate in this order.
  • the light diffusing polarizing plate is disposed so that the polarizing film is closer to the liquid crystal cell than the surface treatment film.
  • the light emitted from the light diffusing means has a light distribution in which the luminance in a direction inclined by 70 ° from the normal direction of the light incident surface of the liquid crystal cell is 20% or less with respect to the luminance in the normal direction. It is preferable that it has characteristics and includes non-parallel light.
  • the light diffusing means can include a light diffusing plate and a light deflecting plate in this order from the backlight device side.
  • a TN (Twisted Nematic) type liquid crystal cell an IPS (In-Plane Switching) type liquid crystal cell, a VA (Vertical Alignment) type liquid crystal cell, or the like can be used.
  • FIG. 1 is a schematic cross-sectional view showing a preferred example of the light diffusing polarizing plate of the present invention.
  • a light diffusing polarizing plate 100 shown in FIG. 1 according to the present invention includes a polarizing film 101, a light diffusing film 102 laminated on the polarizing film 101, and a surface treatment film 103 laminated on the light diffusing film 102.
  • the light diffusing film 102 has a light diffusing layer 106, and the surface-treated film 103 is optically treated on one surface (specifically, a surface-treated layer 108 is provided).
  • the light diffusion layer 106 of the light diffusion film 102 and the surface treatment film 103 are bonded to each other via the pressure-sensitive adhesive layer or the adhesive layer 104.
  • the light diffusing film 102 includes a transparent base film 105 and a light diffusing layer 106 laminated on the transparent base film 105.
  • Reference numeral 106 denotes a resin layer in which translucent fine particles 106b are dispersed in a translucent resin 106a.
  • the light diffusing film 102 is placed on the polarizing film 101 so that the transparent base film 105 side faces the polarizing film 101, that is, the transparent base film 105 is closer to the polarizing film 101 than the light diffusing layer 106. Laminated.
  • the light diffusing film 102 has a center line average roughness Ra according to JIS B 0601 on the surface closer to the surface treatment film 103 of the surface of the light diffusing layer 106 is 0.1 ⁇ m or more and less than 1 ⁇ m.
  • the surface treatment film 103 includes a transparent resin film 107 and a surface treatment layer 108 laminated on one surface of the transparent resin film 107.
  • the surface treatment film 103 is a surface opposite to the surface treatment layer 108 of the transparent resin film 107 (the surface of the surface treatment film 103 that is not subjected to optical treatment), and is a pressure-sensitive adhesive layer or an adhesive layer. It is bonded to the light diffusion layer 106 of the light diffusion film 102 through 104.
  • the protective film 109 is a film for protecting the other surface of the polarizing film 101, it is not necessarily required and may be omitted. Further, instead of the protective film 109, an optical compensation film such as a retardation film (retardation plate) may be bonded.
  • an optical compensation film such as a retardation film (retardation plate) may be bonded.
  • the surface treatment film 103 having a desired optical function is reliably formed on the light diffusion layer 106, and the structure and shape of the surface treatment layer 108 by the surface shape of the light diffusion layer 106 It becomes possible to laminate the film while completely eliminating the influence on the film. Therefore, the light diffusing polarizing plate 100 of the present invention exhibits a predetermined optical function by the surface treatment layer 108 as well as a light diffusing function.
  • polarizing film 101 for example, a dichroic dye or iodine is adsorbed and oriented on a film containing polyvinyl alcohol resin, polyvinyl acetate resin, ethylene / vinyl acetate (EVA) resin, polyamide resin, polyester resin, or the like.
  • a uniaxially stretched polyvinyl alcohol resin film obtained by adsorbing and orienting a dichroic dye or iodine is suitably used as a polarizing film.
  • the thickness of the polarizing film 101 is not particularly limited, but is preferably 100 ⁇ m or less, more preferably 10 to 50 ⁇ m, still more preferably 25 to 35 ⁇ m from the viewpoint of reducing the thickness of the light diffusing polarizing plate.
  • the light diffusion film 102 used in the present invention includes a transparent base film 105 and a light diffusion layer 106 laminated on the transparent base film 105, and the light diffusion layer 106 is translucent. It is preferably composed of a resin layer formed of a resin 106a and translucent fine particles (light diffusing agent) 106b dispersed in the translucent resin 106a.
  • the transparent substrate film 105 is not particularly limited as long as it is optically transparent, and for example, glass or plastic film can be used.
  • the plastic film preferably has moderate transparency and mechanical strength.
  • cellulose acetate resins such as TAC (triacetyl cellulose); acrylic resins; polycarbonate resins; and polyesters such as polyethylene terephthalate Resin; and the like.
  • the thickness of the transparent substrate film 105 is, for example, 10 to 500 ⁇ m, preferably 20 to 300 ⁇ m.
  • the light diffusing layer 106 is a layer having a translucent resin 106a as a base material, and translucent fine particles 106b are dispersed in the translucent resin 106a.
  • the translucent resin 106a is not particularly limited as long as it has translucency.
  • an ionizing radiation curable resin such as an ultraviolet curable resin or an electron beam curable resin or a cured product of a thermosetting resin, A cured product of a thermoplastic resin, a cured product of a metal alkoxide, or the like can be used.
  • ionizing radiation curable resins are preferred because they can impart high hardness and scratch resistance.
  • the translucent resin 106a is formed by curing the resin by irradiation or heating with ionizing radiation.
  • the ionizing radiation curable resin may be synthesized from polyfunctional acrylates such as polyhydric alcohol acrylic acid or methacrylic acid ester; diisocyanate, polyhydric alcohol and acrylic acid or methacrylic acid hydroxy ester, or the like. And polyfunctional urethane acrylates. Besides these, polyether resins having an acrylate functional group; polyester resins; epoxy resins; alkyd resins; spiroacetal resins; polybutadiene resins; polythiol polyene resins;
  • thermosetting resins examples include phenolic resins, urea melamine resins, epoxy resins, unsaturated polyester resins, and silicone resins, in addition to thermosetting urethane resins prepared from acrylic polyols and isocyanate prepolymers.
  • thermoplastic resins include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, and methylcellulose; vinyl acetate and copolymers thereof, vinyl chloride and copolymers thereof, vinylidene chloride and copolymers thereof, and the like.
  • Acetal resins such as polyvinyl formal and polyvinyl butyral; Acrylic resins and copolymers thereof, Acrylic resins such as methacrylic resins and copolymers; Polystyrene resins; Polyamide resins; Polyester resins; Polycarbonate resins Etc.
  • a silicon oxide matrix made of a silicon alkoxide material can be used. Specifically, it is tetramethoxysilane, tetraethoxysilane, or the like, and can be made into an inorganic or organic-inorganic composite matrix (translucent resin) by hydrolysis or dehydration condensation.
  • a light diffusing agent formed from light-transmitting organic fine particles or inorganic fine particles can be used.
  • Organic polymer balloons and glass hollow beads can also be used.
  • the translucent fine particles 106b may be composed of one kind of fine particles, or may contain two or more kinds of fine particles.
  • the shape of the translucent fine particles 106b may be any shape such as a spherical shape, a flat shape, a plate shape, a needle shape, and an indefinite shape, but a spherical shape or a substantially spherical shape is preferable.
  • the weight average particle diameter of the translucent fine particles 106b is preferably 0.5 to 15 ⁇ m, and more preferably 3 to 8 ⁇ m.
  • the weight average particle diameter of the light transmitting fine particles 106b is less than 0.5 ⁇ m, the light diffusing property of the light diffusing film 102 becomes insufficient.
  • the weight average particle diameter exceeds 15 ⁇ m, the light diffusion film 102 may not obtain sufficient light diffusibility.
  • the ratio of the standard deviation of the particle diameter to the weight average particle diameter (standard deviation / weight average particle diameter) of the light transmitting fine particles 106b is preferably 0.5 or less, and is preferably 0.4 or less. More preferred. When the ratio exceeds 0.5, translucent fine particles having an extremely large particle diameter are included, and as a result, the center line average roughness Ra of the light diffusion layer is 1 ⁇ m or more, which deviates from the preferred range. Sometimes.
  • the weight average particle diameter and the standard deviation of the particle diameter of the translucent fine particles 106b are measured using a Coulter Multisizer (manufactured by Beckman Coulter, Inc.) based on the Coulter principle (pore electrical resistance method).
  • the content of the light-transmitting fine particles 106b in the light diffusion layer 106 is preferably 20 parts by weight or more and 100 parts by weight or less with respect to 100 parts by weight of the light-transmitting resin 106a.
  • the surface treatment film 103 is interposed between the pressure-sensitive adhesive layer or the adhesive layer 104.
  • the surface treatment layer 108 is applied to the light diffusing polarizing plate 100 reliably and easily and without impairing the structure and shape necessary for the surface treatment layer 108 to exhibit a predetermined optical function. can do.
  • the content of the light transmissive fine particles 106b in the light diffusion layer 106 is more preferably 20 parts by weight or more and 70 parts by weight or less, and further preferably 25 parts by weight or more and 60 parts by weight or less with respect to 100 parts by weight of the light transmissive resin 106a.
  • it is particularly preferably 30 parts by weight or more and 55 parts by weight or less.
  • the light diffusing film 102 When the content of the light transmissive fine particles 106b is less than 20 parts by weight with respect to 100 parts by weight of the light transmissive resin, the light diffusing film 102 has insufficient light diffusibility. When a polarizing plate is applied, sufficient wide viewing angle performance is difficult to obtain. Further, when the content of the light transmissive fine particles 106b exceeds 100 parts by weight with respect to 100 parts by weight of the light transmissive resin, the haze of the light diffusing film 102 becomes excessively large, resulting in a decrease in transparency of the light diffusing film 102. However, when a light diffusing polarizing plate is applied to the liquid crystal display device, the front contrast is lowered.
  • the difference in refractive index between the translucent fine particles 106b and the translucent resin 106a is preferably in the range of 0.04 to 0.15.
  • the refractive index difference between the translucent fine particles 106b and the translucent resin 106a within the above range, appropriate internal scattering occurs due to the refractive index difference between the translucent fine particles 106b and the translucent resin 106a.
  • the light diffusion film 102 having a moderately high diffusibility can be obtained.
  • the surface of the light diffusion layer 106 (the surface opposite to the transparent base film 105, that is, the surface closer to the surface treatment film 103 among the surfaces of the light diffusion layer 106) is formed only by the translucent resin 106a. Preferably it is formed. That is, it is preferable that the translucent fine particles 106 b do not protrude from the surface of the light diffusion layer 106 and are completely buried in the light diffusion layer 106. Therefore, the thickness of the light diffusion layer 106 is preferably 1 to 3 times the weight average particle diameter of the translucent fine particles 106b.
  • the thickness of the light diffusing layer 106 is less than 1 times the weight average particle diameter of the light transmissive fine particles 106b, the surface of the light diffusing layer 106 is formed when the light diffusing polarizing plate 100 is applied to the liquid crystal display device. Since it becomes too coarse, problems, such as air bubble biting, may occur during surface treatment film bonding. Further, when the thickness of the light diffusion layer 106 exceeds three times the weight average particle diameter of the translucent fine particles 106b, the thickness of the light diffusion layer 106 becomes too large, and the light diffusion property of the light diffusion film 102 is accordingly increased. As a result, when the light diffusing polarizing plate 100 is applied to the liquid crystal display device, the front contrast may be lowered.
  • the thickness of the light diffusion layer refers to the maximum thickness from the surface of the light diffusion layer 106 closer to the transparent base film 105 to the opposite surface. Therefore, in the light diffusion film 102 of the present invention, the thickest portion corresponding to A shown in FIG. In the portion where the thickness from the surface near the transparent base film 105 to the opposite surface of the light diffusion layer 106 is not the maximum (for example, the concave portion of the film having unevenness), the thickness of the light diffusion layer 106 is transparent. It may not be 1 or more times the weight average particle diameter of the light-sensitive fine particles 106b.
  • the thickness of the light diffusion layer 106 is preferably in the range of 1 to 30 ⁇ m.
  • the thickness of the light diffusion layer 106 is less than 1 ⁇ m, sufficient scratch resistance required for the light diffusion film 102 disposed on the viewing side surface of the liquid crystal display device may not be provided.
  • the thickness exceeds 30 ⁇ m, the amount of curl generated in the produced light diffusing film 102 becomes large, and the handleability in the manufacturing process of the light diffusing polarizing plate 100 is deteriorated.
  • Centerline average roughness Ra according to JIS B 0601 of the surface of the light diffusion layer 106 (the surface opposite to the transparent base film 105, ie, the surface of the light diffusion layer 106 closer to the surface treatment film 103) Is 0.1 ⁇ m or more and less than 1 ⁇ m, preferably 0.2 ⁇ m or more and less than 0.5 ⁇ m.
  • the center line average roughness Ra on the surface of the light diffusion layer 106 is 1 ⁇ m or more, there may be a problem such as air bubble biting when the surface treatment film is bonded.
  • the center line average roughness Ra is 0.1 ⁇ m or more, and further 0.2 ⁇ m or more.
  • the surface treatment layer showing a good optical function can be imparted to the light diffusing polarizing plate.
  • the centerline average roughness Ra means that only the reference length l (el) is extracted from the roughness curve in the direction of the centerline, the x-axis is extracted in the direction of the centerline of the extracted portion,
  • Centerline average roughness Ra is a program software that can calculate Ra based on the above formula (1) using a confocal interference microscope (for example, “PL ⁇ 2300” manufactured by Optical Solution Co., Ltd.) in accordance with JIS B 0601. Can be calculated.
  • the center line average roughness Ra of the surface of the light diffusing layer 106 closer to the surface treatment film 103 is 0.1 ⁇ m or more and less than 1 ⁇ m.
  • the light diffusion layer 106 may not contain the light-transmitting resin 106b or the light-transmitting fine particles 106a.
  • the light diffusion film 102 preferably has a total haze of 30% to 70% and an internal haze of 30% to 70%.
  • the total light transmittance (Tt) is the sum of the parallel light transmittance (Tp) and the diffuse light transmittance (Td) that are transmitted coaxially with the incident light.
  • the total light transmittance (Tt) and the diffused light transmittance (Td) are values measured in accordance with JIS K 7361.
  • the “internal haze” of the light diffusing film 102 is a haze other than the haze (surface haze) due to the surface shape of the light emitting surface side of the surface of the light diffusing layer 106 among all the hazes.
  • the total haze and / or internal haze When the total haze and / or internal haze is less than 30%, the light scattering property is insufficient, and it is difficult to obtain sufficient wide viewing angle performance. Moreover, when the total haze and / or internal haze exceeds 70%, light scattering becomes strong, and when the light diffusing polarizing plate 100 is applied to the liquid crystal display device, the front contrast may be lowered. Further, when the total haze and / or internal haze exceeds 70%, the transparency of the light diffusion film 102 tends to be impaired. More preferably, the total haze and the internal haze are 35% or more and 65% or less, respectively.
  • the total haze, internal haze, and surface haze of the light diffusion film 102 are specifically measured as follows. That is, first, in order to prevent warping of the film, the surface of the transparent base film 105 side is a glass substrate so that the light diffusion film 102 becomes the surface using an optically transparent adhesive. The sample for measurement is produced by pasting together, and the total haze value of the sample for measurement is measured. For the total haze value, the total light transmittance (Tt) and diffuse light transmittance are measured using a haze transmittance meter (for example, a haze meter “HM-150” manufactured by Murakami Color Research Laboratory Co., Ltd.) in accordance with JIS K 7136. The rate (Td) is measured and calculated by the above equation (2).
  • a haze transmittance meter for example, a haze meter “HM-150” manufactured by Murakami Color Research Laboratory Co., Ltd.
  • the light diffusion film 102 may have another layer (including an adhesive layer) between the transparent base film 105 and the light diffusion layer 106.
  • the light diffusion film 102 can be formed by a method including a step of applying a resin liquid in which the translucent fine particles 106b are dispersed on the transparent base film 105.
  • the resin liquid is a translucent fine particle 106b, a translucent resin 106a constituting the light diffusion layer 106, or a resin forming the same (for example, ionizing radiation curable resin, thermosetting resin, thermoplastic resin, or metal alkoxide). And other components such as a solvent as necessary.
  • the resin liquid includes a photopolymerization initiator (radical polymerization initiator).
  • photopolymerization initiator examples include acetophenone photopolymerization initiator, benzoin photopolymerization initiator, benzophenone photopolymerization initiator, thioxanthone photopolymerization initiator, triazine photopolymerization initiator, and oxadiazole photopolymerization initiator. An initiator or the like is used.
  • photopolymerization initiator examples include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,2′-bis (o-chlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2 '-Bisimidazole, 10-butyl-2-chloroacridone, 2-ethylanthraquinone, benzyl, 9,10-phenanthrenequinone, camphorquinone, methyl phenylglyoxylate, titanocene compounds and the like can also be used.
  • the amount of the photopolymerization initiator used is usually 0.5 to 20 parts by weight, preferably 1 to 5 parts by weight with respect to 100 parts by weight of the resin contained in the resin liquid.
  • the dispersion of the light-transmitting fine particles 106b in the resin solution is preferably isotropic dispersion.
  • Application of the resin liquid onto the transparent substrate film 105 can be performed, for example, by a gravure coating method, a micro gravure coating method, a rod coating method, a knife coating method, an air knife coating method, a kiss coating method, a die coating method, or the like.
  • the coating film thickness is adjusted so that the thickness of the light diffusion layer 106 is 1 to 3 times the weight average particle diameter of the translucent fine particles 106b. It is preferable to do.
  • Various surface treatments may be applied to the surface of the transparent base film 105 (the surface on the light diffusion layer 106 side) for the purpose of improving the coating property of the resin liquid or improving the adhesion with the light diffusion layer 106.
  • the surface treatment include corona discharge treatment, glow discharge treatment, acid surface treatment, alkali surface treatment, and ultraviolet irradiation treatment.
  • another layer such as a primer layer (easy adhesion layer) may be formed on the transparent base film 105, and the resin liquid may be applied on the other layer.
  • the surface of the transparent substrate film 105 opposite to the surface on the light diffusion layer 106 side is subjected to the surface treatment as described above. It is preferable.
  • the light diffusing film 102 includes a step of applying a resin liquid in which translucent fine particles 106b are dispersed on a transparent base film 105, and a mirror surface or an uneven surface of a mold on the surface of a layer formed from the resin liquid. It can also be formed by a method including a transfer step. That is, the light diffusing layer 106 having the center line average roughness Ra is a mold (mirror mold) having a mirror surface on the surface of the layer formed from the resin liquid, if necessary. It can be formed by closely contacting the uneven surface of a mold having a mirror surface or an uneven surface (embossing mold) and transferring the mirror surface or the uneven surface.
  • the mirror surface mold may be a mirror surface metal roll, and the embossing mold may be an embossing metal roll.
  • thermosetting resin thermoplastic resin or metal alkoxide
  • a layer made of the resin liquid is formed and dried (removal of the solvent) as necessary. If necessary, with the mirror surface or uneven surface of the mold in close contact with the surface of the layer made of the resin liquid, irradiation with ionizing radiation (when using ionizing radiation curable resin), The layer made of the resin liquid is cured by heating (when using a thermosetting resin or metal alkoxide) or cooling (when using a thermoplastic resin).
  • the ionizing radiation can be appropriately selected from ultraviolet rays, electron beams, near ultraviolet rays, visible rays, near infrared rays, infrared rays, X-rays, etc. depending on the type of resin contained in the resin liquid.
  • ultraviolet rays An electron beam is preferable, and ultraviolet rays are particularly preferable because of easy handling and high energy.
  • a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, or the like can be used.
  • An ArF excimer laser, a KrF excimer laser, an excimer lamp, synchrotron radiation, or the like can also be used.
  • an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a xenon lamp, and a metal halide lamp are preferably used.
  • the electron beam 50 to 1000 keV emitted from various electron beam accelerators such as Cockloft Walton type, Bande graph type, resonance transformation type, insulation core transformation type, linear type, dynamitron type, and high frequency type, preferably 100 Mention may be made of electron beams having an energy of ⁇ 300 keV.
  • various electron beam accelerators such as Cockloft Walton type, Bande graph type, resonance transformation type, insulation core transformation type, linear type, dynamitron type, and high frequency type, preferably 100 Mention may be made of electron beams having an energy of ⁇ 300 keV.
  • the step of continuously feeding the transparent base film 105 wound in a roll shape the translucent fine particles 106b are dispersed. It includes a step of applying a resin liquid and drying it as necessary, a step of curing a layer formed from the resin liquid, and a step of winding up the obtained light diffusion film 102.
  • a manufacturing method can be implemented, for example, using a manufacturing apparatus shown in FIG.
  • the transparent base film 105 is continuously unwound by the unwinding device 301.
  • a resin liquid in which the translucent fine particles 106 b are dispersed is applied onto the unwound transparent base film 105 using the coating device 302 and the backup roll 303 facing the coating device 302.
  • the transparent substrate film 105 coated with the resin liquid is dried by passing it through the dryer 304.
  • the transparent base film 105 provided with the layer formed from the resin liquid is formed between the mirror-made metal roll or the embossing metal roll 305 and the nip roll 306, and the layer formed from the resin liquid is It is unwound so as to be in close contact with the mirror surface metal roll or the embossing metal roll 305. Thereby, the mirror surface of the mirror surface metal roll or the uneven surface of the metal roll for embossing is transferred to the surface of the layer formed from the resin liquid.
  • ultraviolet rays are irradiated from the ultraviolet irradiation device 308 through the transparent substrate film 105 in a state where the layer formed from the resin liquid on the transparent substrate film 105 is in close contact with the mirror surface metal roll or the embossing metal roll 305.
  • the layer formed from the resin liquid is cured to form the light diffusion layer 106.
  • the mirror surface metal roll or the embossing metal roll 305 preferably includes a cooling device for adjusting the surface temperature to about room temperature to 80 ° C. .
  • one or a plurality of ultraviolet irradiation devices 308 can be used.
  • the transparent substrate film 105 (light diffusion film 102) on which the light diffusion layer 106 is formed is peeled off from the mirror surface metal roll or the embossing metal roll 305 by the peeling roll 307.
  • the light diffusion film 102 manufactured as described above is wound up by the winding device 309. At this time, for the purpose of protecting the light diffusion layer 106, light is applied to the surface of the light diffusion layer 106 while attaching a surface protective film formed of polyethylene terephthalate, polyethylene or the like through a pressure-sensitive adhesive layer having removability.
  • the diffusion film 102 may be wound up.
  • additional ultraviolet irradiation may be performed after peeling from the mirror surface metal roll or the embossing metal roll 305 by the peeling roll 307.
  • additional ultraviolet irradiation instead of performing ultraviolet irradiation in a state where the mirror metal roll or the embossing metal roll 305 and the layer formed from the resin liquid are in close contact with each other, a transparent layer formed from an uncured resin liquid is formed.
  • the layer formed from the resin liquid may be cured by irradiating ultraviolet rays.
  • the light diffusion film 102 and the polarizing film 101 are bonded to each other through an adhesive layer or the like.
  • the light diffusing film 102 also functions as a protective film for the polarizing film 101, and such a configuration is advantageous for reducing the thickness of the light diffusing polarizing plate 100.
  • the bonding using the adhesive between the light diffusion film 102 and the polarizing film 101 is performed by the same method using the same adhesive as described later for the bonding between the surface treatment film 103 and the light diffusion film 102. Can do.
  • the surface treatment film 103 is a film in which one surface of the transparent resin film 107 is optically treated. Specifically, the surface treatment layer 108 having a desired optical function on one surface of the transparent resin film 107. It can be a film formed.
  • the transparent resin film 107 for example, a cellulose acetate resin such as TAC (triacetyl cellulose); an acrylic resin such as polymethyl methacrylate; a polycarbonate resin; and a polyester resin such as polyethylene terephthalate; A film can be used.
  • the thickness of the transparent resin film 107 is, for example, 10 to 500 ⁇ m, and preferably 20 to 300 ⁇ m.
  • the surface treatment layer 108 is an anti-glare layer having irregularities on the surface, and reduces or prevents reflection of external light on the display screen by using irregular reflection due to the irregularities on the surface.
  • the antiglare film that is, the optical treatment is an antiglare treatment
  • the surface treatment layer 108 is an antireflection layer, which reduces or prevents the reflection of external light incident on the display screen to the display screen.
  • An antireflection film that reduces or prevents reflection of external light that is, the optical treatment is an antireflection treatment
  • the antiglare film for example, a mold having a predetermined surface irregularity on the ultraviolet curable resin layer formed by coating an ultraviolet curable resin composition containing or not containing fine particles on the transparent resin film 107. And an ultraviolet curable resin containing fine particles on the transparent resin film 107 formed by curing the ultraviolet curable resin layer while pressing the concavo-convex surface of the transparent resin film 107. Applying the composition and using an anti-glare layer provided with predetermined surface irregularities by fine particles formed by curing the applied UV-curable resin layer without using a mold Can do.
  • a commercially available anti-glare film can also be used as the anti-glare film.
  • an antireflection film for example, a film having a low refractive index layer made of a material having a refractive index lower than that of the light diffusion layer 106 as an antireflection layer, or a refractive index higher than the refractive index of the light diffusion layer 106 is used.
  • the low refractive index layer is, for example, silica; metal fluoride fine particles (LiF, MgF, 3NaF / AlF, AlF, Na 3 AlF 6 etc.); fine particles having voids inside (hollow silica fine particles etc.); fluorine-containing polymer; And a low refractive index material and a binder resin.
  • the binder resin may be a conventionally known one, and is a polysiloxane resin, a hydrolyzate of silicon alkoxide, a light or thermosetting multi-branched compound (such as a dendrimer or a hyperbranched polymer), or other light or thermosetting resin. be able to.
  • One or more of other layers such as a hard coat layer and an antistatic layer may be interposed between the transparent resin film 107 and the low refractive index layer or the high refractive index layer.
  • a commercially available antireflection film can also be used as the antireflection film.
  • the surface treatment film 103 is usually a surface opposite to the surface of the transparent resin film 107 close to the surface treatment layer 108 (optical treatment of the surface treatment film 103 is performed).
  • the surface treatment film 103 is usually a surface opposite to the surface of the transparent resin film 107 close to the surface treatment layer 108 (optical treatment of the surface treatment film 103 is performed).
  • the surface treatment film 103 is usually a surface opposite to the surface of the transparent resin film 107 close to the surface treatment layer 108 (optical treatment of the surface treatment film 103 is performed).
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 104 conventionally known ones can be used, and examples thereof include acrylic pressure-sensitive adhesives, urethane pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives. Among these, an acrylic pressure-sensitive adhesive is preferably used from the viewpoints of transparency, adhesive strength, reliability, reworkability, and the like.
  • the pressure-sensitive adhesive layer 104 can be provided by a method in which such a pressure-sensitive adhesive is, for example, an organic solvent solution, which is applied onto the light diffusion layer 106 or the transparent resin film 107 by a die coater or a gravure coater and dried.
  • a sheet-like pressure-sensitive adhesive formed on a plastic film (referred to as a separate film) subjected to a release treatment to the light diffusion layer 106 or the transparent resin film 107.
  • the thickness of the pressure-sensitive adhesive layer is usually in the range of 2 to 40 ⁇ m.
  • an epoxy resin can be used because the surface treatment film 103 and the light diffusion film 102 can be bonded with high adhesive strength without adversely affecting the appearance of the light diffusing polarizing plate 100.
  • An adhesive containing an active energy ray or a thermosetting resin composition such as a curable resin composition containing water, or an aqueous adhesive containing a polyvinyl alcohol resin or a urethane resin as an adhesive component can be preferably used. .
  • the adhesive agent containing the curable resin composition containing an epoxy resin is used more preferable.
  • Bonding of the surface treatment film 103 and the light diffusion film 102 using an adhesive containing a curable resin composition containing an epoxy resin is performed by applying the adhesive on the light diffusion layer 106 or the transparent resin film 107. Then, after laminating both films via an uncured adhesive layer, the film can be cured by irradiating with active energy rays or heating to cure the uncured adhesive layer.
  • various coating methods such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater can be used. Since each coating method has an optimum viscosity range, the viscosity of the adhesive may be adjusted using an organic solvent.
  • the thickness of the adhesive layer after curing is usually 0.1 to 20 ⁇ m, preferably 0.2 to 10 ⁇ m, more preferably 0.5 to 5 ⁇ m.
  • the bonding surface of the transparent resin film 107 and / or the light diffusion layer 106 is subjected to an easy adhesion process such as a corona discharge process or a primer process (formation of a primer layer). May be.
  • the light diffusing polarizing plate of the present invention may include a protective film 109 laminated on the opposite side of the polarizing film 101 from the light diffusing film 102 via an adhesive layer or the like.
  • the protective film 109 is preferably a film made of a polymer that has low birefringence and is excellent in transparency, mechanical strength, thermal stability, moisture shielding properties, and the like.
  • Such films include cellulose acetate resins such as TAC (triacetyl cellulose); acrylic resins; fluorine resins such as tetrafluoroethylene / hexafluoropropylene copolymers; polycarbonate resins; polyethylenes Polyester resin such as terephthalate; Polyimide resin; Polysulfone resin; Polyethersulfone resin; Polystyrene sulfone resin; Polyvinyl alcohol resin; Polyvinyl chloride resin; Resin film composed of polyolefin resin or polyamide resin Is mentioned.
  • a triacetyl cellulose film and a norbornene-based thermoplastic resin film can be preferably used from the viewpoints of polarization characteristics and durability.
  • the norbornene-based thermoplastic resin film is particularly suitable because it has high moisture and heat resistance and can greatly improve the durability of the polarizing plate and has high dimensional stability because of low hygroscopicity.
  • a conventionally known method such as a casting method, a calendar method, and an extrusion method can be used.
  • the thickness of the protective film 109 is not limited. To 500 ⁇ m or less, more preferably in the range of 5 to 300 ⁇ m, still more preferably in the range of 5 to 150 ⁇ m.
  • the bonding using the adhesive between the polarizing film 101 and the protective film 109 can be performed by the same method using the same adhesive as described above for the bonding between the surface treatment film 103 and the light diffusion film 102. it can.
  • an optical compensation film such as a retardation film (retardation plate) may be bonded to the polarizing film 101 instead of the protective film 109.
  • the light diffusing polarizing plate 100 having the above-described configuration is applied to a liquid crystal display device, an adhesive layer or the like is interposed so that the surface treatment film 103 is closer to the viewing side than the polarizing film 101. Then, it is attached to the glass substrate of the liquid crystal cell and incorporated into the liquid crystal display device.
  • the liquid crystal display device of the present invention comprises a backlight device, a light diffusion means, a backlight side polarizing plate, a liquid crystal cell, and the light diffusing polarizing plate of the present invention in this order.
  • FIG. 3 is a schematic sectional view showing a preferred example of the liquid crystal display device of the present invention.
  • the liquid crystal display device 400 of FIG. 3 is a normally white mode TN liquid crystal display device, which is a backlight device 402, a light diffusion means 403, a backlight side polarizing plate 404, and a viewing side polarizing plate.
  • the light diffusing polarizing plate 405 is arranged in this order, and the liquid crystal cell 401 includes a liquid crystal layer 412 and a pair of transparent substrates 411 a and 411 b arranged on both surfaces of the liquid crystal layer 412.
  • the backlight side polarizing plate 404 and the light diffusing polarizing plate 405 are disposed so that their transmission axes have a crossed Nicols relationship.
  • the backlight device 402 is a direct-type backlight device including a hexahedron-shaped case 421 having a front opening and a plurality of cold cathode tubes 422 as linear light sources arranged in parallel in the case 421.
  • the light diffusing unit 403 is provided on the front surface of the backlight device 402, and on the front side of the light diffusing plate 403a (between the light diffusing plate 403a and the backlight side polarizing plate 404). And an optical deflection plate (prism sheet) 403b.
  • the light emitted from the backlight device 402 is diffused by the light diffusing plate 403a of the light diffusing means 403, and then the light incident surface of the liquid crystal cell 401 by the light deflecting plate 403b.
  • Predetermined directivity in the perpendicular direction (z-axis direction) is given.
  • the directivity in the perpendicular direction is set to be higher than that of the conventional device.
  • the light having a predetermined directivity is polarized by the backlight side polarizing plate 404 and enters the liquid crystal cell 401.
  • the light incident on the liquid crystal cell 401 is emitted from the liquid crystal cell 401 with the polarization state controlled by the liquid crystal layer 412.
  • the light emitted from the liquid crystal cell 401 is diffused by the light diffusing polarizing plate 405.
  • the directivity of the light incident on the liquid crystal cell 401 in the light diffusing unit 403 in the perpendicular direction (z-axis direction) of the light incident surface of the liquid crystal cell 401 is higher than before. That is, the incident light to the liquid crystal cell 401 is collected more than before, and this is further diffused by the light diffusing polarizing plate 405. This makes it possible to obtain an excellent image quality such as color reproducibility as compared with the conventional apparatus.
  • the liquid crystal display device 400 of the present invention to which the light diffusing polarizing plate 405 of the present invention is applied has high viewing angle characteristics and also has an optical function other than the light diffusing function provided to the light diffusing polarizing plate 405. Excellent visibility.
  • the liquid crystal cell 401 includes a pair of transparent substrates 411a and 411b and a liquid crystal layer 412.
  • the pair of transparent substrates 411a and 411b are arranged to face each other with a predetermined distance by a spacer, and the liquid crystal layer 412 includes a pair of transparent substrates 411a and 411a. It is composed of liquid crystal sealed between 411b.
  • the pair of transparent substrates 411a and 411b are each formed by laminating a transparent electrode and an alignment film, and the liquid crystal is aligned by applying a voltage based on display data between the transparent electrodes.
  • the display method of the liquid crystal cell 401 is the TN method in the above example, but a display method such as an IPS method or a VA method may also be adopted.
  • the backlight device 402 includes a hexahedron-shaped case 421 having a front opening, and a plurality of cold cathode tubes 422 as linear light sources arranged in parallel in the case 421.
  • the case 421 is molded from a resin material or a metal material, and at least the inner peripheral surface of the case 421 is desirably white or silver from the viewpoint of reflecting the light emitted from the cold cathode fluorescent lamp 422 on the inner peripheral surface of the case 421.
  • LEDs of various shapes such as a linear shape can be used in addition to a cold cathode tube.
  • the number of the linear light sources to be arranged is not particularly limited, but the distance between the centers of the adjacent linear light sources is in the range of 15 mm to 150 mm from the viewpoint of suppressing luminance unevenness on the light emitting surface. It is preferable.
  • the backlight device 402 used in the present invention is not limited to the direct type shown in FIG. 3, but is a sidelight type in which a linear light source or a point light source is arranged on the side surface of the light guide plate, or a flat type. Various types such as a shape light source type can be used.
  • the light diffusing unit 403 includes a light diffusing plate 403a disposed on the front surface of the backlight device 402, and a front surface side of the light diffusing plate 403a (light diffusing plate 403a and backlight side polarizing plate 404). And a light deflection plate (prism sheet) 403b provided between the two.
  • the light diffusing plate 403 a can be a film or sheet in which a light diffusing agent 440 is dispersed and mixed with a base material 430.
  • polycarbonate resin As the base material 430, polycarbonate resin; methacrylic resin; methyl methacrylate-styrene copolymer resin; acrylonitrile-styrene copolymer resin; methacrylic acid-styrene copolymer resin; polystyrene resin; Polyolefin resins such as polypropylene and polymethylpentene; cyclic polyolefin resins; polyester resins such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyamide resins; polyarylate resins; polyimide resins; .
  • the light diffusing agent 440 mixed and dispersed in the base material 430 is not particularly limited as long as it is a fine particle formed of a material having a refractive index different from that of the base material 430.
  • it is different from the material of the base material 430.
  • Organic fine particles formed from various types of acrylic resin, melamine resin, polyethylene resin, polystyrene resin, organic silicone resin, acrylic-styrene copolymer resin, and calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, oxidation Inorganic fine particles formed from titanium, glass and the like can be mentioned. Only one type of light diffusing agent 440 may be used, or two or more types may be used in combination.
  • the weight average particle diameter of the light diffusing agent 440 is preferably in the range of 0.5 to 30 ⁇ m.
  • the light diffusing agent 440 may have a spherical shape, a flat shape, a plate shape, a needle shape, or the like, but is preferably a spherical shape.
  • the light deflection plate (prism sheet) 403b has a flat surface on the light incident surface side (the backlight device 402 side, the negative direction side of the z axis shown in FIG. 4) and the light emitting side (z shown in FIG. 4).
  • a plurality of linear prisms 450 having a tapered cross section, preferably a triangular shape, are formed in parallel on the surface on the positive side of the axis (the surface facing the backlight side polarizing plate 404).
  • Examples of the material of the light deflector 403b include polycarbonate resin; ABS resin; methacrylic resin; methyl methacrylate-styrene copolymer resin; polystyrene resin; acrylonitrile-styrene copolymer resin; polyolefins such as polyethylene and polypropylene. Resin; and the like.
  • a method for producing the light deflection plate 403b a normal thermoplastic resin molding method can be used, and examples thereof include hot press molding using a mold and extrusion molding.
  • the thickness of the light deflection plate 403b is usually 0.1 to 15 mm, preferably 0.5 to 10 mm.
  • the “thickness of the light deflection plate” refers to the maximum thickness from the surface of the light deflection plate 403b close to the light diffusion plate 403a to the apex of the apex angle of the linear prism 450. Point to. Therefore, the thickest portion corresponding to B shown in FIG. 4 is the thickness of the light deflection plate 403b. In a portion where the thickness from the surface of the light deflecting plate 403b close to the light diffusing plate 403a to the tip of the apex angle of the linear prism 450 is not maximum (for example, the valley portion of the linear prism 450), the light deflecting plate 403b. The thickness may not be in the above range.
  • the light diffusing plate 403a and the light deflecting plate 403b may be integrally formed, or may be formed separately and then joined. Further, in the case of separately producing and joining, the light diffusing plate 403a and the light deflecting plate 403b may be contacted via an air layer. Further, the light diffusion plate 403a and the light deflection plate 403b may be arranged apart from each other.
  • the light diffusing unit 403 may be provided with a light diffusing function by dispersing and mixing a light diffusing agent 440 on a light deflecting plate 403 b having a light deflecting function.
  • the light diffusing unit 403 may include two light deflecting plates (prism sheets) 403b and 403b 'disposed on the front side of the light diffusing plate 403a.
  • the direction of the ridge line 451 of the linear prism 450 is the transmission axis direction (y
  • the light deflection plate 403b ′ disposed substantially parallel to the axial direction) and disposed on the front surface side of the light deflection plate 403b has a direction of the ridge line 451 ′ of the linear prism 450 ′ as a light diffusing polarizing plate.
  • the light deflection plate 403b ′ is arranged so that the direction of the ridge line 451 ′ of the linear prism 450 ′ of the light deflection plate 403b ′ is substantially parallel to the transmission axis direction (y-axis direction) of the backlight side polarizing plate 404, and the light deflection plate 403b.
  • the ridge line 451 of the linear prism 450 may be arranged so as to be substantially parallel to the transmission axis direction (x-axis direction) of the light diffusing polarizing plate 405.
  • the light distribution characteristic of the light that has passed through the light diffusing means 403 is such that the luminance value in the direction inclined by 70 ° from the perpendicular direction (z-axis direction shown in FIG. 3) of the light incident surface of the liquid crystal cell 401 is the front luminance value. It is preferable that it is 20% or less with respect to the luminance value in the perpendicular direction of the light incident surface of the liquid crystal cell 401, and the light emitted from the light diffusing means 403 includes non-parallel light.
  • a more preferable light distribution characteristic is that no light is emitted in a direction exceeding 60 ° with respect to the normal of the light incident surface of the liquid crystal cell 401. Normally, as shown in FIG.
  • the back surface (light incident surface) of the light diffusing means 403 and the light incident surface of the liquid crystal cell 401 are arranged in parallel, so that the perpendicular to the light incident surface of the liquid crystal cell 401 is
  • the luminance value in the 70 ° direction is, for example, as shown in FIG. 7, where the longitudinal direction of the light diffusing unit 403 is the x direction and the plane parallel to the back surface (light incident surface) of the light diffusing unit 403 is the xy plane.
  • the luminance value is in the direction of 70 ° with respect to the z axis, which is a perpendicular to the xy plane, and preferably the luminance value in the direction in which the angle formed with the z axis on the xz plane is 70 °.
  • the shape of the linear prism 450 (and / or the linear prism 450 ') having a triangular cross section of the light deflection plate 403b may be adjusted.
  • the apex angle ⁇ (see FIGS. 4 and 5) of the linear prisms 450 and 450 ′ is preferably in the range of 60 to 120 °, more preferably 90 to 110 °.
  • an equal side and an unequal side can be arbitrarily selected, but an isosceles triangle is preferable in the case where light is focused in the perpendicular direction of the liquid crystal cell 401 (the front direction of the liquid crystal display device, that is, the z-axis direction).
  • the prism surface composed of linear prisms is arranged sequentially so that the bases corresponding to the apex angles of the triangles are adjacent to each other, and a plurality of linear prisms are arranged so as to be substantially parallel to each other. Is preferred.
  • the V-shaped grooves formed by the apexes of the linear prisms and the adjacent linear prisms may be curved as long as the light collecting ability is not significantly reduced.
  • the distance between the ridgelines of the linear prism (distance d shown in FIGS. 4 and 5) is usually in the range of 10 ⁇ m to 500 ⁇ m, and preferably in the range of 30 ⁇ m to 200 ⁇ m.
  • non-parallel light means that light emitted from a circle having a diameter of 1 cm on the exit surface of the light diffusing means 403 is parallel to the exit surface, which is 1 m away from the exit surface in the perpendicular direction.
  • the light has emission characteristics such that the minimum half-value width of the in-plane luminance distribution of the projection image is 30 cm or more.
  • Backlight side polarizing plate As the backlight-side polarizing plate 404, a polarizing film in which a protective film is bonded to one side or both sides can be usually used. As a polarizing film and a protective film, what was mentioned above about the light diffusable polarizing plate 100 can be used.
  • the liquid crystal display device of the present invention can include a retardation plate 406.
  • the retardation film 406 is disposed between the backlight side polarizing plate 404 and the liquid crystal cell 401.
  • This phase difference plate 406 has a phase difference of almost zero in the direction perpendicular to the surface of the liquid crystal cell 401 (z-axis direction), has no optical effect from the front, and is viewed from an oblique direction. A phase difference is sometimes developed, and the phase difference generated in the liquid crystal cell 401 is compensated. This makes it possible to obtain better display quality and color reproducibility over a wider viewing angle.
  • the retardation plate 406 can be disposed between the backlight side polarizing plate 404 and the liquid crystal cell 401 and between one or both of the light diffusing polarizing plate 405 and the liquid crystal cell 401.
  • the retardation film 406 can be laminated on the protective film of the backlight side polarizing plate 404, or can also be laminated directly on the polarizing film of the backlight side polarizing plate 404 while also serving as a protective film. .
  • phase difference plate 406 for example, a polycarbonate resin or a cyclic olefin polymer resin is used as a film, and this film is further biaxially stretched, or a liquid crystalline monomer is applied to the film, and its molecular arrangement is changed by a photopolymerization reaction. Immobilized ones are listed.
  • the phase difference plate 406 optically compensates for the alignment of the liquid crystal, and therefore has a refractive index characteristic opposite to that of the liquid crystal alignment.
  • a TN mode liquid crystal cell for example, “WV film” (manufactured by FUJIFILM Corporation)
  • STN mode liquid crystal display cell for example, “LC film” (manufactured by Nippon Oil Corporation)
  • LC film manufactured by Nippon Oil Corporation
  • IPS mode liquid crystal display cells for example, a biaxial retardation film
  • VA mode liquid crystal display cells for example, a retardation plate or a biaxial retardation film combining a A plate and a C plate
  • a ⁇ cell for the mode liquid crystal display cell, for example, “OCB WV film” (manufactured by FUJIFILM Corporation) can be suitably used.
  • the methods for measuring the haze and surface centerline average roughness Ra of the light diffusion film, the thickness of the light diffusion layer, and the weight average particle diameter of the light-transmitting fine particles used are as follows.
  • (C) Light diffusing layer thickness The thickness of the light diffusing film is measured using DIGIMICRO MH-15 (main body) and ZC-101 (counter) manufactured by NIKON, and the substrate thickness of 80 ⁇ m is subtracted from the measured layer thickness. Was used to measure the thickness of the light diffusion layer.
  • the surface of a 200 mm diameter iron roll (STKM13A by JIS) was prepared by applying copper ballad plating.
  • the copper ballad plating was formed from a copper plating layer / a thin silver plating layer / a surface copper plating layer, and the thickness of the entire plating layer was about 200 ⁇ m.
  • the copper-plated surface is mirror-polished, and zirconia beads TZ-B125 (manufactured by Tosoh Corporation, average particle size: 125 ⁇ m) are further polished on the polished surface using a blasting device (manufactured by Fuji Seisakusho).
  • Blasting was performed at a blast pressure of 0.05 MPa (gauge pressure, the same shall apply hereinafter) and a fine particle usage amount of 16 g / cm 2 (a usage amount per 1 cm 2 of surface area of the roll, the same applies hereinafter) to form irregularities on the surface.
  • a blasting device manufactured by Fuji Seisakusho
  • zirconia beads TZ-SX-17 manufactured by Tosoh Corporation, average particle size: 20 ⁇ m
  • blast pressure 0.1 MPa using fine particles Blasting was performed at an amount of 4 g / cm 2 to finely adjust the surface irregularities.
  • the resulting copper-plated iron roll with unevenness was etched with a cupric chloride solution (etching amount: 3 ⁇ m). Then, chromium plating processing (thickness of chromium plating: 4 ⁇ m) was performed to produce a metal embossing roll.
  • the Vickers hardness of the chrome-plated surface of the obtained metal embossing roll was 1000. The Vickers hardness was measured according to JIS Z 2244 using an ultrasonic hardness tester MIC10 (manufactured by Krautkramer).
  • This coating solution was applied on a transparent resin film which is a 80 ⁇ m thick triacetyl cellulose (TAC) film, and dried for 1 minute in a drier set at 80 ° C.
  • TAC triacetyl cellulose
  • the dried transparent resin film was pressed and adhered to the uneven surface of the metal embossing roll with a rubber roll so that the ultraviolet curable resin composition layer was on the roll side.
  • light from a high-pressure mercury lamp having an intensity of 20 mW / cm 2 is irradiated from the transparent resin film side so that the amount of light in terms of h-line is 300 mJ / cm 2 to cure the ultraviolet curable resin composition layer, and transparent An antiglare film having an antiglare layer formed on the resin film was obtained.
  • This coating solution was applied onto a transparent resin film (refractive index: 1.49), which is a TAC film having a thickness of 80 ⁇ m, with a wire bar coater and dried in a dryer set at 80 ° C. for 1 minute.
  • a hard coat layer was formed on the transparent resin film after drying by irradiating with ultraviolet rays at a power of 120 W from a distance of 20 cm for 10 seconds using a metal halide lamp.
  • the obtained hard coat layer had a thickness of 5 ⁇ m and a refractive index of 1.52.
  • ATO antimony-doped tin oxide
  • the TAC film on which the hard coat layer is formed is immersed in a 1.5N-NaOH aqueous solution at 50 ° C. for 2 minutes for alkali treatment, washed with water, and then washed with 0.5 wt% H 2 SO 4 aqueous solution at room temperature. It was neutralized by dipping for 30 seconds, further washed with water, and dried.
  • the antistatic layer-forming coating solution was applied onto the alkali-treated hard coat layer with a wire bar coater and dried in a drier set at 120 ° C. for 1 minute to form an antistatic layer.
  • the resulting antistatic layer had a thickness of 163 nm, a refractive index of 1.53, and an optical film thickness of 250 nm.
  • the obtained coating solution for forming a low refractive index layer was coated on the antistatic layer with a wire bar coater and dried in a dryer set at 120 ° C. for 1 minute to form a low refractive index layer.
  • the obtained low refractive index layer had a thickness of 91 nm, a refractive index of 1.37, and an optical film thickness of 125 nm.
  • an antireflection film including a hard coat layer, an antistatic layer, and a low refractive index layer on a transparent resin film was produced.
  • 10 polystyrene particles having a weight average particle diameter of 3.0 ⁇ m and a standard deviation of 0.39 ⁇ m are used as the first light-transmitting fine particles with respect to 100 parts by weight of the solid content of the ultraviolet curable resin composition.
  • This coating solution was applied onto a TAC film (transparent substrate film) having a thickness of 80 ⁇ m, dried for 1 minute in a drier set at 80 ° C., and then strength 20 mW / cm 2 from the transparent substrate film side.
  • Light from a high-pressure mercury lamp is irradiated so as to be 300 mJ / cm 2 in terms of the amount of h-ray conversion, the ultraviolet curable resin composition layer is cured, and light diffusion comprising a light diffusion layer and a transparent substrate film Film A was obtained.
  • the total haze, internal haze, and surface haze of the obtained light diffusion film A were 65.8%, 48.2%, and 17.6%, respectively. Further, the center line average roughness Ra of the surface was 0.42 ⁇ m, and the thickness of the light diffusion layer was 10.9 ⁇ m.
  • Example 1 After the corona treatment is applied to the surface of the transparent base film of the light diffusion film A obtained in Production Example 3, an ultraviolet curable adhesive containing an ultraviolet curable epoxy resin and a cationic photopolymerization initiator is thickened on the corona treatment surface. Coating was performed at 4 ⁇ m. On the other hand, after a corona treatment was applied to one side of a TAC film (thickness 80 ⁇ m) as a protective film, the same UV curable adhesive as described above was applied to the corona treatment surface with a thickness of 4 ⁇ m.
  • the light diffusing film A is laminated on one surface of a polarizing film formed by adsorbing and orienting iodine on a uniaxially stretched polyvinyl alcohol-based resin film, and the protection is provided on the other surface.
  • the film was laminated through the adhesive layer and sandwiched between a pair of nip rolls. Then, the ultraviolet-ray was irradiated from the protective film side, both the adhesive bond layers were hardened, and the light diffusable polarizing plate was obtained.
  • Example 2 a light diffusing polarizing plate subjected to an antireflection treatment was obtained in the same manner as in Example 1 except that the antireflection film obtained in Production Example 2 was used.
  • Example 1 instead of the laminate (used in Example 1) in which the light diffusion film A and the antiglare film are laminated via an adhesive layer, the surface of the light diffusion layer of the light diffusion film A is replaced with the metal embossing roll.
  • a light diffusing polarizing plate subjected to an antiglare treatment was obtained in the same manner as in Example 1 except that a film having an antiglare treatment applied to the light diffusion layer was used by pressing the concavo-convex surface with a rubber roll. .
  • Example 2 instead of the above laminate (used in Example 2) in which the light diffusion film A and the antireflection film are laminated via an adhesive layer, the surface of the light diffusion layer of the light diffusion film A has
  • the anti-reflection treatment was performed in the same manner as in Example 2 except that the anti-reflection layer and the low-refractive index layer were sequentially formed, and the light diffusion layer was subjected to an anti-reflection treatment.
  • the obtained light diffusable polarizing plate was obtained.
  • Color unevenness is a phenomenon in which the inside of the surface looks rainbow-colored in the above visual observation due to in-plane non-uniformity on the antireflection treatment surface. When such color unevenness occurs, the antireflection function is poor. It is judged that there is.
  • DESCRIPTION OF SYMBOLS 100,405 ... Light diffusable polarizing plate, 101 ... Polarizing film, 102 ... Light diffusing film, 103 ... Surface treatment film, 104 ... Adhesive layer or adhesive layer, 105 ... Transparent base film, 106 ... Light diffusing layer, 106a ... translucent resin, 106b ... translucent fine particles, 107 ... transparent resin film, 108 ... surface treatment layer, 109 ... protective film, 301 ... unwinding device, 302 ... coating device, 303 ... backup roll, 304 ... Dryer, 305 ... mirror surface metal roll or embossing metal roll, 306 ... nip roll, 307 ... peeling roll, 308 ...
  • ultraviolet irradiation device 309 ... winding device, 400, 400 '... liquid crystal display device, 401 ... liquid crystal Cell, 402 ... Backlight device, 403 ... Light diffusing means, 403a ... Light diffusing plate, 403b, 403b '... Light Direction plate, 404 ... Backlight side polarizing plate, 406 ... Phase difference plate, 411a, 411b ... Transparent substrate, 412 ... Liquid crystal layer, 421 ... Case, 422 ... Cold cathode tube, 430 ... Base material, 440 ... Light diffusing agent, 450, 450 '... linear prism, 451, 451' ... ridge line of linear prism.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une nouvelle plaque de polarisation de diffusion de lumière qui diffuse suffisamment la lumière et qui offre également d'autres bonnes fonctionnalités optiques. L'invention concerne également un dispositif d'affichage à cristaux liquides (400) utilisant ladite plaque de polarisation de diffusion de lumière. La plaque de polarisation de diffusion de lumière (100) comprend : un film polarisant (101) ; un film de diffusion de lumière (102) stratifié sur le film polarisant (101) ; et un film traité en surface (103) stratifié sur le film de diffusion de lumière (102). Le film de diffusion de lumière (102) possède une couche de diffusion de lumière (106), et la rugosité moyenne de la ligne centrale (Ra) de la surface de la couche de diffusion de lumière (106) au plus près du film traité en surface (103) est d'au moins 0,1 µm et inférieure à 1 µm. Le film traité en surface (103) consiste en un film de résine transparent (107) dont une surface est traitée optiquement. La couche de diffusion de lumière (106) et le film traité en surface (103) sont collés l'un à l'autre par un adhésif ou une couche d'adhésif autocollant (104).
PCT/JP2011/063606 2010-06-24 2011-06-14 Plaque de polarisation de difusion de lumière et dispositif d'affichage à cristaux liquides WO2011162132A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010143961 2010-06-24
JP2010-143961 2010-06-24

Publications (1)

Publication Number Publication Date
WO2011162132A1 true WO2011162132A1 (fr) 2011-12-29

Family

ID=45371326

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/063606 WO2011162132A1 (fr) 2010-06-24 2011-06-14 Plaque de polarisation de difusion de lumière et dispositif d'affichage à cristaux liquides

Country Status (3)

Country Link
JP (1) JP2012027461A (fr)
TW (1) TW201213885A (fr)
WO (1) WO2011162132A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6108104B2 (ja) * 2013-06-26 2017-04-05 オムロン株式会社 光偏向プレート、面光源装置及び照光スイッチ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002090508A (ja) * 2000-09-12 2002-03-27 Nitto Denko Corp 光拡散性シート及び光学素子
JP2002323699A (ja) * 2001-04-26 2002-11-08 Rohm Co Ltd 液晶表示装置およびその製造方法
JP2003131032A (ja) * 2001-10-23 2003-05-08 Nitto Denko Corp 粘着型光学部材及び液晶表示装置
JP2003302506A (ja) * 2002-02-08 2003-10-24 Dainippon Printing Co Ltd 防眩性フィルムおよび画像表示装置
JP2007148415A (ja) * 1997-09-25 2007-06-14 Dainippon Printing Co Ltd 光拡散フィルム、その製造方法、拡散層付偏光板及び液晶表示装置
JP2008139736A (ja) * 2006-12-05 2008-06-19 Sumitomo Chemical Co Ltd 光拡散板
JP2009210592A (ja) * 2008-02-29 2009-09-17 Sumitomo Chemical Co Ltd 防眩性偏光板およびそれを用いた画像表示装置
JP2009301014A (ja) * 2008-04-03 2009-12-24 Sumitomo Chemical Co Ltd 液晶表示装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007148415A (ja) * 1997-09-25 2007-06-14 Dainippon Printing Co Ltd 光拡散フィルム、その製造方法、拡散層付偏光板及び液晶表示装置
JP2002090508A (ja) * 2000-09-12 2002-03-27 Nitto Denko Corp 光拡散性シート及び光学素子
JP2002323699A (ja) * 2001-04-26 2002-11-08 Rohm Co Ltd 液晶表示装置およびその製造方法
JP2003131032A (ja) * 2001-10-23 2003-05-08 Nitto Denko Corp 粘着型光学部材及び液晶表示装置
JP2003302506A (ja) * 2002-02-08 2003-10-24 Dainippon Printing Co Ltd 防眩性フィルムおよび画像表示装置
JP2008139736A (ja) * 2006-12-05 2008-06-19 Sumitomo Chemical Co Ltd 光拡散板
JP2009210592A (ja) * 2008-02-29 2009-09-17 Sumitomo Chemical Co Ltd 防眩性偏光板およびそれを用いた画像表示装置
JP2009301014A (ja) * 2008-04-03 2009-12-24 Sumitomo Chemical Co Ltd 液晶表示装置

Also Published As

Publication number Publication date
JP2012027461A (ja) 2012-02-09
TW201213885A (en) 2012-04-01

Similar Documents

Publication Publication Date Title
JP5887080B2 (ja) 光拡散フィルムおよびその製造方法、光拡散性偏光板、ならびに液晶表示装置
WO2011027905A1 (fr) Film diffuseur de lumière et son procédé de fabrication, plaque de polarisation diffuseuse de lumière, et dispositif d'affichage à cristaux liquides
WO2011027903A1 (fr) Film diffuseur de lumière et son procédé de fabrication, plaque de polarisation diffuseuse de lumière, et dispositif d'affichage à cristaux liquides
WO2011162133A1 (fr) Plaque de polarisation de diffusion de lumière et dispositif d'affichage à cristaux liquides
WO2011004898A1 (fr) Film de diffusion de lumière et dispositif d'affichage à cristaux liquides le comprenant
WO2012043410A1 (fr) Plaque polarisante diffusant la lumière et dispositif d'affichage à cristaux liquides
WO2010073985A1 (fr) Film optique et dispositif d'affichage à cristaux liquides le comprenant
WO2011162184A1 (fr) Plaque de polarisation diffusant la lumière et dispositif d'affichage à cristaux liquides.
WO2012046790A1 (fr) Film de diffusion de lumière, son procédé de production, plaque de polarisation de diffusion de lumière et dispositif d'affichage à cristaux liquides
WO2010113873A1 (fr) Dispositif d'affichage à cristaux liquides
WO2010073997A1 (fr) Film optique et dispositif d'affichage à cristaux liquides le comprenant
WO2012060457A1 (fr) Film de diffusion de lumière, procédé pour fabriquer le film de diffusion de lumière, plaque de polarisation diffusant la lumière et dispositif d'affichage à cristaux liquides
WO2011162188A1 (fr) Plaque de polarisation de diffusion de lumière et dispositif d'affichage à cristaux liquides
JP6058905B2 (ja) 光拡散フィルムの製造方法及び偏光板の製造方法
WO2010113879A1 (fr) Dispositif d'affichage à cristaux liquides
JP5827811B2 (ja) 液晶表示装置
WO2012074123A1 (fr) Film optique et dispositif d'affichage à cristaux liquides
WO2011162132A1 (fr) Plaque de polarisation de difusion de lumière et dispositif d'affichage à cristaux liquides

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11798018

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11798018

Country of ref document: EP

Kind code of ref document: A1