WO2013080948A1 - Liquid crystal display device, polarizing plate, and polarizer protective film - Google Patents
Liquid crystal display device, polarizing plate, and polarizer protective film Download PDFInfo
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- WO2013080948A1 WO2013080948A1 PCT/JP2012/080561 JP2012080561W WO2013080948A1 WO 2013080948 A1 WO2013080948 A1 WO 2013080948A1 JP 2012080561 W JP2012080561 W JP 2012080561W WO 2013080948 A1 WO2013080948 A1 WO 2013080948A1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
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- Polarising Elements (AREA)
Abstract
Description
項1.
バックライト光源、2つの偏光板、及び前記2つの偏光板の間に配置された液晶セルを有する液晶表示装置であって、
前記バックライト光源は連続的な発光スペクトルを有する白色光源であり、
前記2つ偏光板は、各々偏光子とその両側の保護フィルムからなり、
前記の両側の保護フィルムの少なくとも一方は、3000~30000nmのリタデーションを有する配向ポリエステルフィルムであり、
前記2つの偏光板を構成する配向ポリエステルフィルムの配向主軸は互いに略平行である、
液晶表示装置。
項2.
前記配向ポリエステルフィルムのリタデーションと厚さ方向リタデーションの比(Re/Rth)が0.2以上1.2以下である項1に記載の液晶表示装置。
項3.
前記連続的な発光スペクトルを有する白色光源が、白色発光ダイオードで構成される、項1又は2のいずれかに記載の液晶表示装置。
項4.
前記ポリエステルフィルムが3層以上からなり、
最外層以外の層に紫外線吸収剤を含有し、
380nmの光線透過率が20%以下である、
項1~3のいずれかに記載の液晶表示装置。 The representative present invention is as follows.
Item 1.
A liquid crystal display device having a backlight light source, two polarizing plates, and a liquid crystal cell disposed between the two polarizing plates,
The backlight source is a white light source having a continuous emission spectrum;
Each of the two polarizing plates comprises a polarizer and protective films on both sides thereof,
At least one of the protective films on both sides is an oriented polyester film having a retardation of 3000 to 30000 nm,
The orientation main axes of the oriented polyester film constituting the two polarizing plates are substantially parallel to each other.
Liquid crystal display device.
Item 2.
Item 2. The liquid crystal display device according to item 1, wherein the ratio (Re / Rth) of retardation of the oriented polyester film to thickness direction retardation is 0.2 or more and 1.2 or less.
Item 3.
Item 3. The liquid crystal display device according to any one of Items 1 and 2, wherein the white light source having the continuous emission spectrum is formed of a white light emitting diode.
Item 4.
The polyester film consists of three or more layers,
Contains a UV absorber in a layer other than the outermost layer,
The light transmittance at 380 nm is 20% or less,
Item 4. The liquid crystal display device according to any one of Items 1 to 3.
厚み斑(%)=((dmax-dmin)/d)×100 The thickness unevenness of the film of the present invention is preferably 5.0% or less, more preferably 4.5% or less, still more preferably 4.0% or less, and 3.0% or less. It is particularly preferred. The thickness unevenness of the film can be measured by any means. For example, a tape-like sample (length 3 m) continuous in the film flow direction is collected, and an electronic micrometer (Millitron) manufactured by Seiko EM Co., Ltd. 1240) and the like, measure the thickness at 100 points at a pitch of 1 cm, obtain the maximum value (dmax), minimum value (dmin), and average value (d) of the thickness, and calculate by the following formula: Can do.
Thickness unevenness (%) = ((dmax−dmin) / d) × 100
フィルムの配向主軸方向は、分子配向計(王子計測器株式会社製、MOA-6004型分子配向計)を用いて求めた。 (1) Film orientation principal axis The orientation principal axis direction of the film was determined using a molecular orientation meter (manufactured by Oji Scientific Instruments, MOA-6004 type molecular orientation meter).
リタデーションとは、フィルム上の直交する二軸の屈折率の異方性(△Nxy=|Nx-Ny|)とフィルム厚みd(nm)との積(△Nxy×d)で定義されるパラメーターであり、光学的等方性、異方性を示す尺度である。二軸の屈折率の異方性(△Nxy)は、以下の方法により求めた。分子配向計(王子計測器株式会社製、MOA-6004型分子配向計)を用いて、フィルムの配向主軸方向を求め、配向主軸方向が測定用サンプル長辺と平行になるように、4cm×2cmの長方形を切り出し、測定用サンプルとした。このサンプルについて、直交する二軸の屈折率(Nx,Ny)、及び厚さ方向の屈折率(Nz)をアッベ屈折率計(アタゴ社製、NAR-4T、測定波長589nm)によって求め、前記二軸の屈折率差の絶対値(|Nx-Ny|)を屈折率の異方性(△Nxy)とした。フィルムの厚みd(nm)は電気マイクロメータ(ファインリューフ社製、ミリトロン1245D)を用いて測定し、単位をnmに換算した。屈折率の異方性(△Nxy)とフィルムの厚みd(nm)の積(△Nxy×d)より、リタデーション(Re)を求めた。 (2) Retardation (Re)
Retardation is a parameter defined by the product (ΔNxy × d) of the biaxial refractive index anisotropy (ΔNxy = | Nx−Ny |) on the film and the film thickness d (nm). Yes, it is a scale showing optical isotropy and anisotropy. The biaxial refractive index anisotropy (ΔNxy) was determined by the following method. Using a molecular orientation meter (MOA-6004 type molecular orientation meter, manufactured by Oji Scientific Instruments Co., Ltd.), the orientation principal axis direction of the film is obtained and 4 cm × 2 cm so that the orientation principal axis direction is parallel to the long side of the measurement sample. A rectangle was cut out and used as a measurement sample. For this sample, the biaxial refractive index (Nx, Ny) perpendicular to each other and the refractive index (Nz) in the thickness direction were determined by an Abbe refractometer (Atago Co., Ltd., NAR-4T, measurement wavelength 589 nm). The absolute value of the refractive index difference (| Nx−Ny |) of the axis was defined as the anisotropy (ΔNxy) of the refractive index. The thickness d (nm) of the film was measured using an electric micrometer (manufactured by Fine Reef, Millitron 1245D), and the unit was converted to nm. Retardation (Re) was determined from the product (ΔNxy × d) of refractive index anisotropy (ΔNxy) and film thickness d (nm).
厚さ方向リタデーションとは、フィルム厚さ方向断面から見たときの2つの複屈折△Nxz(=|Nx-Nz|)、△Nyz(=|Ny-Nz|)にそれぞれフィルム厚さdを掛けて得られるリタデーションの平均を示すパラメーターである。リタデーションの測定と同様の方法でNx、Ny、Nzとフィルム厚みd(nm)を求め、(△Nxz×d)と(△Nyz×d)との平均値を算出して厚さ方向リタデーション(Rth)を求めた。 (3) Thickness direction retardation (Rth)
Thickness direction retardation is obtained by multiplying two birefringences ΔNxz (= | Nx−Nz |) and ΔNyz (= | Ny−Nz |) by film thickness d when viewed from the cross section in the film thickness direction. It is a parameter which shows the average of retardation obtained. Thickness direction retardation (Rth) is calculated by calculating Nx, Ny, Nz and film thickness d (nm) by the same method as the measurement of retardation, and calculating an average value of (ΔNxz × d) and (ΔNyz × d). )
分光光度計(日立製作所製、U-3500型)を用い、空気層を標準として各フィルムの波長300~500nm領域の光線透過率を測定し、波長380nmにおける光線透過率を求めた。 (4) Light transmittance at a wavelength of 380 nm Using a spectrophotometer (manufactured by Hitachi, U-3500 type), the light transmittance in a wavelength region of 300 to 500 nm of each film is measured using an air layer as a standard. The transmittance was determined.
PVAとヨウ素からなる偏光子の片側に後述する方法で作成したポリエステルフィルム1~10のいずれかを偏光子の偏光軸とポリエステルフィルムの配向主軸が垂直又は平行になるように貼り付け、その反対の面にTACフィルム(富士フイルム(株)社製、厚み80μm)を貼り付けて偏光板を作成した。得られた偏光板を液晶を挟んで両側に一枚ずつ、各偏光板がクロスニコルの条件下になるよう配置して液晶表示装置を作製した。この時、各偏光板は前記ポリエステルフィルムが液晶とは反対側(遠位)となるように配置するように配置された。また、各偏光板は、それを構成するポリエステルフィルムからなる偏光子保護フィルムの配向主軸が互いに垂直又は平行となるように配置された。なお、偏光子保護フィルムの配向主軸が互いに垂直となる場合については、偏光子保護フィルムの配向主軸と偏光子の偏光軸とは互いに垂直となるように張り合わせた。液晶表示装置の光源には、青色発光ダイオードとイットリウム・アルミニウム・ガーネット系黄色蛍光体とを組み合わせた発光素子からなる白色LEDを光源(日亜化学、NSPW500CS)に用いた。このような液晶表示装置の偏光板の正面、及び斜め方向から目視観察し、虹斑の発生有無について、以下のように判定した。 (5) Observation of rainbow spots Any one of the polyester films 1 to 10 prepared by the method described later on one side of a polarizer made of PVA and iodine so that the polarization axis of the polarizer and the orientation main axis of the polyester film are perpendicular or parallel. A polarizing plate was prepared by attaching a TAC film (manufactured by Fuji Film Co., Ltd., thickness 80 μm) to the opposite surface. The obtained polarizing plate was placed on both sides of the liquid crystal so that each polarizing plate was in a crossed Nicols condition to produce a liquid crystal display device. At this time, each polarizing plate was arrange | positioned so that the said polyester film might be arrange | positioned so that it might become the opposite side (distal) from a liquid crystal. Moreover, each polarizing plate was arrange | positioned so that the orientation main axis | shaft of the polarizer protective film which consists of a polyester film which comprises it might become mutually perpendicular | vertical or parallel. In addition, about the case where the orientation main axis | shaft of a polarizer protective film becomes mutually perpendicular | vertical, it bonded together so that the orientation main axis | shaft of a polarizer protective film and the polarization axis of a polarizer might mutually become perpendicular | vertical. As a light source of the liquid crystal display device, a white LED composed of a light emitting element in which a blue light emitting diode and a yttrium / aluminum / garnet yellow phosphor were combined was used as a light source (Nichia Chemical, NSPW500CS). Visual observation was performed from the front and oblique directions of the polarizing plate of such a liquid crystal display device, and the presence or absence of rainbow spots was determined as follows.
B: 斜め方向から観察したときに、角度によっては薄い虹斑が観察できる。
C: 斜め方向から観察した時に、虹斑が観察できる。
D: 正面方向及び斜め方向から観察した時に、虹斑が観察できる。 A: No iridescence from any direction.
B: When observed from an oblique direction, a thin rainbow can be observed depending on the angle.
C: Iris can be observed when observed from an oblique direction.
D: Iris can be observed when observed from the front and diagonal directions.
東洋精機製作所製エレメンドルフ引裂試験機を用いて、JIS P-8116に従い、各フィルムの引裂き強度を測定した。引裂き方向はフィルムの配向主軸方向と平行となるように行ない、以下のように判定した。
○:引裂き強度が50mN以上
×:引裂き強度が50mN未満 (6) Tear Strength The tear strength of each film was measured according to JIS P-8116 using an Elmendorf tear tester manufactured by Toyo Seiki Seisakusho. The tearing direction was performed so as to be parallel to the orientation main axis direction of the film, and was determined as follows.
○: Tear strength is 50 mN or more ×: Tear strength is less than 50 mN
エステル化反応缶を昇温し200℃に到達した時点で、テレフタル酸を86.4質量部およびエチレングリコール64.6質量部を仕込み、撹拌しながら触媒として三酸化アンチモンを0.017質量部、酢酸マグネシウム4水和物を0.064質量部、トリエチルアミン0.16質量部を仕込んだ。ついで、加圧昇温を行いゲージ圧0.34MPa、240℃の条件で加圧エステル化反応を行った後、エステル化反応缶を常圧に戻し、リン酸0.014質量部を添加した。さらに、15分かけて260℃に昇温し、リン酸トリメチル0.012質量部を添加した。次いで15分後に、高圧分散機で分散処理を行い、15分後、得られたエステル化反応生成物を重縮合反応缶に移送し、280℃で減圧下重縮合反応を行った。 (Production Example 1-Polyester A)
When the temperature of the esterification reactor was raised to 200 ° C., 86.4 parts by mass of terephthalic acid and 64.6 parts by mass of ethylene glycol were charged and 0.017 parts by mass of antimony trioxide as a catalyst while stirring. 0.064 parts by mass of magnesium acetate tetrahydrate and 0.16 parts by mass of triethylamine were charged. Subsequently, the pressure was raised and the esterification reaction was performed under the conditions of a gauge pressure of 0.34 MPa and 240 ° C., and then the esterification reaction vessel was returned to normal pressure, and 0.014 parts by mass of phosphoric acid was added. Furthermore, it heated up to 260 degreeC over 15 minutes, and 0.012 mass part of trimethyl phosphate was added. Then, after 15 minutes, dispersion treatment was performed with a high-pressure disperser, and after 15 minutes, the obtained esterification reaction product was transferred to a polycondensation reaction can and subjected to polycondensation reaction at 280 ° C. under reduced pressure.
乾燥させた紫外線吸収剤(2,2’-(1,4-フェニレン)ビス(4H-3,1-ベンズオキサジノン-4-オン)10質量部、粒子を含有しないPET(A)(固有粘度が0.62dl/g)90質量部を混合し、混練押出機を用い、紫外線吸収剤含有するポリエチレンテレフタレート樹脂(B)を得た。(以後、PET(B)と略す。) (Production Example 2-Polyester B)
10 parts by weight of a dried UV absorber (2,2 ′-(1,4-phenylene) bis (4H-3,1-benzoxazinon-4-one), PET (A) containing no particles (inherent viscosity Was 0.62 dl / g) and 90 parts by mass were mixed, and a polyethylene terephthalate resin (B) containing an ultraviolet absorber was obtained using a kneading extruder (hereinafter abbreviated as PET (B)).
常法によりエステル交換反応および重縮合反応を行って、ジカルボン酸成分として(ジカルボン酸成分全体に対して)テレフタル酸46モル%、イソフタル酸46モル%および5-スルホナトイソフタル酸ナトリウム8モル%、グリコール成分として(グリコール成分全体に対して)エチレングリコール50モル%およびネオペンチルグリコール50モル%の組成の水分散性スルホン酸金属塩基含有共重合ポリエステル樹脂を調製した。次いで、水51.4質量部、イソプロピルアルコール38質量部、n-ブチルセルソルブ5質量部、ノニオン系界面活性剤0.06質量部を混合した後、加熱撹拌し、77℃に達したら、上記水分散性スルホン酸金属塩基含有共重合ポリエステル樹脂5質量部を加え、樹脂の固まりが無くなるまで撹拌し続けた後、樹脂水分散液を常温まで冷却して、固形分濃度5.0質量%の均一な水分散性共重合ポリエステル樹脂液を得た。さらに、凝集体シリカ粒子(富士シリシア(株)社製、サイリシア310)3質量部を水50質量部に分散させた後、上記水分散性共重合ポリエステル樹脂液99.46質量部にサイリシア310の水分散液0.54質量部を加えて、撹拌しながら水20質量部を加えて、接着性改質塗布液を得た。 (Production Example 3-Adjustment of Adhesive Modification Coating Solution)
A transesterification reaction and a polycondensation reaction were carried out by a conventional method, and as a dicarboxylic acid component (based on the total dicarboxylic acid component) 46 mol% terephthalic acid, 46 mol% isophthalic acid and 8 mol% sodium 5-sulfonatoisophthalate, A water-dispersible sulfonic acid metal base-containing copolymer polyester resin having a composition of 50 mol% ethylene glycol and 50 mol% neopentyl glycol as a glycol component (based on the entire glycol component) was prepared. Next, 51.4 parts by mass of water, 38 parts by mass of isopropyl alcohol, 5 parts by mass of n-butyl cellosolve, 0.06 parts by mass of a nonionic surfactant were mixed and then heated and stirred. After adding 5 parts by mass of a water-dispersible sulfonic acid metal base-containing copolymer polyester resin and continuing to stir until the resin is no longer agglomerated, the resin water dispersion is cooled to room temperature to obtain a solid content concentration of 5.0% by mass. A uniform water-dispersible copolymerized polyester resin liquid was obtained. Furthermore, after dispersing 3 parts by mass of aggregated silica particles (Silicia 310, manufactured by Fuji Silysia Co., Ltd.) in 50 parts by mass of water, 99.46 parts by mass of the water-dispersible copolyester resin solution was mixed with 99.46 parts by mass of Silicia 310. 0.54 parts by mass of the aqueous dispersion was added, and 20 parts by mass of water was added with stirring to obtain an adhesive modified coating solution.
基材フィルム中間層用原料として粒子を含有しないPET(A)樹脂ペレット90質量部と紫外線吸収剤を含有したPET(B)樹脂ペレット10質量部を135℃で6時間減圧乾燥(1Torr)した後、押出機2(中間層II層用)に供給し、また、PET(A)を常法により乾燥して押出機1(外層I層および外層III用)にそれぞれ供給し、285℃で溶解した。この2種のポリマーを、それぞれステンレス焼結体の濾材(公称濾過精度10μm粒子95%カット)で濾過し、2種3層合流ブロックにて、積層し、口金よりシート状にして押し出した後、静電印加キャスト法を用いて表面温度30℃のキャスティングドラムに巻きつけて冷却固化し、未延伸フィルムを作った。この時、I層、II層、III層の厚さの比は10:80:10となるように各押し出し機の吐出量を調整した。 (Polarizer protective film 1)
After drying 90 parts by mass of PET (A) resin pellets containing no particles as a raw material for the base film intermediate layer and 10 parts by mass of PET (B) resin pellets containing an ultraviolet absorber at 135 ° C. for 6 hours under reduced pressure (1 Torr) , And supplied to the extruder 2 (for the intermediate layer II layer). Also, the PET (A) was dried by an ordinary method and supplied to the extruder 1 (for the outer layer I layer and the outer layer III), and dissolved at 285 ° C. . After filtering these two kinds of polymers with a filter medium made of a sintered stainless steel (nominal filtration accuracy of 10 μm particles 95% cut), laminating them in a two-kind / three-layer confluence block, and extruding them into a sheet form from a die, The film was wound around a casting drum having a surface temperature of 30 ° C. using an electrostatic application casting method, and then cooled and solidified to produce an unstretched film. At this time, the discharge amount of each extruder was adjusted so that the thickness ratio of the I layer, the II layer, and the III layer was 10:80:10.
未延伸フィルムの厚みを変更することにより、厚み約100μmとすること以外は偏光子保護フィルム1と同様にして一軸配向PETフィルムを得た。 (Polarizer protective film 2)
By changing the thickness of the unstretched film, a uniaxially oriented PET film was obtained in the same manner as the polarizer protective film 1 except that the thickness was about 100 μm.
偏光子保護フィルム1と同様の方法により作製された塗布層が形成された未延伸フィルムを、加熱されたロール群及び赤外線ヒーターを用いて105℃に加熱し、その後周速差のあるロール群で走行方向に1.5倍延伸した後、偏光子保護フィルム1と同様の方法で幅方向に4.0倍延伸して、フィルム厚み約50μmの二軸配向PETフィルムを得た。 (Polarizer protective film 3)
The unstretched film on which the coating layer produced by the same method as that of the polarizer protective film 1 is formed is heated to 105 ° C. using a heated roll group and an infrared heater, and then a roll group having a difference in peripheral speed. After stretching 1.5 times in the running direction, the film was stretched 4.0 times in the width direction in the same manner as the polarizer protective film 1 to obtain a biaxially oriented PET film having a film thickness of about 50 μm.
偏光子保護フィルム3と同様の方法で、走行方向に2.0倍、幅方向に4.0倍延伸して、フィルム厚み約50μmの二軸配向PETフィルムを得た。 (Polarizer protective film 4)
In the same manner as for the polarizer protective film 3, the film was stretched 2.0 times in the running direction and 4.0 times in the width direction to obtain a biaxially oriented PET film having a film thickness of about 50 μm.
偏光子保護フィルム1と同様の方法で、中間層に紫外線吸収剤を含有するPET樹脂(B)を用いずに、フィルム厚み50μmの一軸配向PETフィルムを得た。 (Polarizer protective film 5)
A uniaxially oriented PET film having a film thickness of 50 μm was obtained in the same manner as in the polarizer protective film 1 without using a PET resin (B) containing an ultraviolet absorber in the intermediate layer.
偏光子保護フィルム3と同様の方法で、走行方向に4.0倍、幅方向に1.0倍延伸して、フィルム厚み約100μmの一軸配向PETフィルムを得た。 (Polarizer protective film 6)
In the same manner as the polarizer protective film 3, the film was stretched 4.0 times in the running direction and 1.0 times in the width direction to obtain a uniaxially oriented PET film having a film thickness of about 100 μm.
偏光子保護フィルム1と同様の方法で、走行方向に1.0倍、幅方向に3.5倍延伸して、フィルム厚み約75μmの一軸配向PETフィルムを得た。 (Polarizer protective film 7)
In the same manner as for the polarizer protective film 1, the film was stretched 1.0 times in the running direction and 3.5 times in the width direction to obtain a uniaxially oriented PET film having a film thickness of about 75 μm.
偏光子保護フィルム1と同様の方法を用い、未延伸フィルムの厚みを変更することにより、厚み約275μmの一軸配向PETフィルムを得た。 (Polarizer protective film 8)
A uniaxially oriented PET film having a thickness of about 275 μm was obtained by changing the thickness of the unstretched film using the same method as for the polarizer protective film 1.
偏光子保護フィルム3と同様の方法で、走行方向に3.6倍、幅方向に4.0倍延伸して、フィルム厚み約38μmの二軸配向PETフィルムを得た。 (Polarizer protective film 9)
In the same manner as for the polarizer protective film 3, the film was stretched 3.6 times in the running direction and 4.0 times in the width direction to obtain a biaxially oriented PET film having a film thickness of about 38 μm.
偏光子保護フィルム1と同様の方法を用い、未延伸フィルムの厚みを変更することにより、厚み約10μmの一軸配向PETフィルムを得た。 (Polarizer protective film 10)
A uniaxially oriented PET film having a thickness of about 10 μm was obtained by changing the thickness of the unstretched film using the same method as for the polarizer protective film 1.
単層にした以外は、偏光子保護フィルム5と同様にして、フィルム厚み50μmの一軸配向PETフィルムを得た。なお、液晶表示装置の光源に、青色発光ダイオードとイットリウム・アルミニウム・ガーネット系黄色蛍光体とを組み合わせた発光素子からなる白色LEDに変えてOLEDを用いて虹斑観察を行った。 (Polarizer protective film 11)
A uniaxially oriented PET film having a film thickness of 50 μm was obtained in the same manner as in the polarizer protective film 5 except that a single layer was used. Note that rainbow spots were observed using an OLED instead of a white LED composed of a light emitting element combining a blue light emitting diode and a yttrium / aluminum / garnet yellow phosphor as a light source of a liquid crystal display device.
By using the liquid crystal display device, the polarizing plate and the polarizer protective film of the present invention, it becomes possible to contribute to thinning and cost reduction of LCD without reducing visibility due to rainbow-like color spots. The above availability is very high.
Claims (4)
- バックライト光源、2つの偏光板、及び前記2つの偏光板の間に配置された液晶セルを有する液晶表示装置であって、
前記バックライト光源は連続的な発光スペクトルを有する白色光源であり、
前記2つ偏光板は、各々偏光子とその両側の保護フィルムからなり、
前記の両側の保護フィルムの少なくとも一方は、3000~30000nmのリタデーションを有する配向ポリエステルフィルムであり、
前記2つの偏光板を構成する配向ポリエステルフィルムの配向主軸は互いに略平行である、
液晶表示装置。 A liquid crystal display device having a backlight light source, two polarizing plates, and a liquid crystal cell disposed between the two polarizing plates,
The backlight source is a white light source having a continuous emission spectrum;
Each of the two polarizing plates comprises a polarizer and protective films on both sides thereof,
At least one of the protective films on both sides is an oriented polyester film having a retardation of 3000 to 30000 nm,
The orientation main axes of the oriented polyester film constituting the two polarizing plates are substantially parallel to each other.
Liquid crystal display device. - 前記配向ポリエステルフィルムのリタデーションと厚さ方向リタデーションの比(Re/Rth)が0.2以上1.2以下である請求項1に記載の液晶表示装置。 The liquid crystal display device according to claim 1, wherein a ratio of the retardation of the oriented polyester film to the retardation in the thickness direction (Re / Rth) is 0.2 or more and 1.2 or less.
- 前記連続的な発光スペクトルを有する白色光源が、白色発光ダイオードである、請求項1又は2のいずれかに記載の液晶表示装置。 3. The liquid crystal display device according to claim 1, wherein the white light source having the continuous emission spectrum is a white light emitting diode.
- 前記ポリエステルフィルムが3層以上からなり、
最外層以外の層に紫外線吸収剤を含有し、
380nmの光線透過率が20%以下である、
請求項1~3のいずれかに記載の液晶表示装置。
The polyester film consists of three or more layers,
Contains a UV absorber in a layer other than the outermost layer,
The light transmittance at 380 nm is 20% or less,
The liquid crystal display device according to any one of claims 1 to 3.
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CN201280058791.2A CN103959149B (en) | 2011-11-29 | 2012-11-27 | Liquid crystal indicator, Polarizer and polaroid protective film |
JP2013547151A JP5614506B2 (en) | 2011-11-29 | 2012-11-27 | Liquid crystal display device, polarizing plate and polarizer protective film |
KR1020147016781A KR101947854B1 (en) | 2011-11-29 | 2012-11-27 | Liquid crystal display device, polarizing plate, and polarizer protective film |
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