JPH01225916A - Phase difference plate and composite polarizing plate and liquid crystal display device using phase difference plate - Google Patents
Phase difference plate and composite polarizing plate and liquid crystal display device using phase difference plateInfo
- Publication number
- JPH01225916A JPH01225916A JP63052455A JP5245588A JPH01225916A JP H01225916 A JPH01225916 A JP H01225916A JP 63052455 A JP63052455 A JP 63052455A JP 5245588 A JP5245588 A JP 5245588A JP H01225916 A JPH01225916 A JP H01225916A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- plate
- display device
- phase difference
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 70
- 239000002131 composite material Substances 0.000 title claims description 15
- 210000002858 crystal cell Anatomy 0.000 claims abstract description 18
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- 208000028659 discharge Diseases 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 34
- 230000003287 optical effect Effects 0.000 abstract description 30
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 3
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- 238000003851 corona treatment Methods 0.000 description 15
- 239000000853 adhesive Substances 0.000 description 12
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- 229920005668 polycarbonate resin Polymers 0.000 description 9
- 239000004431 polycarbonate resin Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 229920006289 polycarbonate film Polymers 0.000 description 7
- 239000011521 glass Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000975 dye Substances 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- -1 polyethylene terephthalate Polymers 0.000 description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
- 229920002284 Cellulose triacetate Polymers 0.000 description 3
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229910052740 iodine Inorganic materials 0.000 description 3
- 239000011630 iodine Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical group C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- WOLATMHLPFJRGC-UHFFFAOYSA-N furan-2,5-dione;styrene Chemical compound O=C1OC(=O)C=C1.C=CC1=CC=CC=C1 WOLATMHLPFJRGC-UHFFFAOYSA-N 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229920001600 hydrophobic polymer Polymers 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920006350 polyacrylonitrile resin Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 150000004291 polyenes Chemical class 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000807 solvent casting Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
Landscapes
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、位相差板、及びこれを用いた複合偏光板、さ
らには、これらを用いた液晶表示装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a retardation plate, a composite polarizing plate using the same, and a liquid crystal display device using the same.
従来の液晶表示装置は、例えば特開昭５３−１３１８５
３号公報に記載されているように、液晶分子のねじれ角
が９０度であり、液晶セルの上下に一対の偏光板を設け
、その吸収軸が直交、又は平行になるように配置された
ものであって、時計、電卓等に通用されてきた（−最に
ＴＮ型液晶表示装置といわれている）。A conventional liquid crystal display device is, for example, disclosed in Japanese Patent Application Laid-Open No. 13185-1985.
As described in Publication No. 3, the twist angle of the liquid crystal molecules is 90 degrees, and a pair of polarizing plates are provided above and below the liquid crystal cell, and the absorption axes are arranged so that they are perpendicular or parallel. It has been widely used in watches, calculators, etc. (-most commonly referred to as TN type liquid crystal display devices).
近年、表示容量の増大、表示画面の拡大要請に伴って、
液晶分子のねじれ角を９０度以上、具体的には１８０〜
２７０度程度にした液晶表示装置が開発された（一般に
ＳＴＮ型液晶表示装置といわれている）。しかしながら
、従来のＴＮ型液晶表示装置では可能であった白黒表示
が、ＳＴＮ型液晶表示装置では、液晶分子の複屈折に起
因する着色が生じ、白黒表示が出来なくなる。−例を示
せば、背景色が黄緑色であり、表示色が濃紺色である。In recent years, with the increase in display capacity and the demand for larger display screens,
The twist angle of the liquid crystal molecules is 90 degrees or more, specifically 180 degrees or more.
A liquid crystal display device with an angle of approximately 270 degrees has been developed (generally referred to as an STN type liquid crystal display device). However, black-and-white display, which was possible with conventional TN-type liquid crystal display devices, is no longer possible with STN-type liquid crystal display devices due to coloring caused by birefringence of liquid crystal molecules. - For example, the background color is yellow-green and the display color is dark blue.
表示装置がこのような色相を有していると、マルチカラ
ー、フルカラーといったカラー表示を行う際に制約を受
けることが多い。この問題点を解決するために例えば、
日経マイクロデバイス１９８７年１０月号８４頁に記載
されているように、ＳＴＮ型液晶セルにもう一枚、色消
し用の液晶セルを光学補償板として加え、着色を解消し
、白黒表示を可能にする方法が示されている。When a display device has such a hue, it is often subject to restrictions when performing color display such as multi-color or full-color display. For example, to solve this problem,
As described in the October 1987 issue of Nikkei Micro Devices, page 84, an additional achromatic liquid crystal cell was added to the STN type liquid crystal cell as an optical compensation plate to eliminate coloring and enable black and white display. It shows how to do this.
しかし、上述した方法では、白黒表示は可能になるもの
の、液晶セルを光学補償板に用いているために（１）値
段が高い（２）重い（３）厚いといった問題点があり、
上記した表示性能の改良に加えてこれらの問題点を解決
することが要請されている。However, although the above-mentioned method enables black and white display, it uses a liquid crystal cell as an optical compensation plate, so it has the following problems: (1) It is expensive, (2) It is heavy, and (3) It is thick.
In addition to improving the display performance described above, there is a need to solve these problems.
本発明は、上記の点に鑑み、研究を重ねた結果、完成さ
れたものであって、少な（とも一方の面に放電処理を実
施した熱可塑性樹脂からなる位相差板、及びこれを用い
た複合偏光板、さらにはこれらを用いた液晶表示装置に
関するものである。The present invention has been completed as a result of repeated research in view of the above points, and includes a retardation plate made of a thermoplastic resin that has been subjected to electrical discharge treatment on one side, and a retardation plate using the same. The present invention relates to a composite polarizing plate and a liquid crystal display device using the same.
すなわち、本発明は、複屈折率（Δｎ）と厚み（ｄ）の
積で定義される、レターデーション（Δｎ×ｄ）の測定
値が３０〜１２００ｎｍであって、少なくとも一方の面
に放電処理を実施した熱可塑性樹脂からなる位相差板を
第１の発明とし、該位相差板は液晶表示装置等に適用出
来る。液晶表示装置に適用する場合には、液晶セルに貼
付される面に対して反対側の面が放電処理されているこ
とが必要である。複屈折率（Δｎ）と厚み（ｄ）の積で
定義されるレターデーション（Δｎｘｄ）の測定値が３
０〜１２００ｎｍであって少なくとも一方の面に放電処
理を実施した熱可塑性樹脂からなる位相差板上この面に
偏光板を貼合したことを特徴とする複合偏光板を第２の
発明とし、該複合偏光板は液晶表示装置等に通用するこ
とが出来る。複屈折率（Δｎ）と厚み（ｄ）の積で定義
されるレターデーション（Δｎ×ｄ）の測定値が３０〜
１２００ｎｍであって少な（とも液晶表示装置の液晶セ
ルに貼付される面に対して反対側の面が放電処理されて
いる熱可塑性樹脂からなる位相差板を液晶セルの片側の
面に貼付し、それらをはさむようにして一対の偏光板を
貼付した構造を有することを特徴とする液晶表示装置を
第３の発明とするものである。That is, the present invention has a measured value of retardation (Δn x d) defined as the product of birefringence (Δn) and thickness (d) of 30 to 1200 nm, and at least one surface is subjected to discharge treatment. The first invention is a retardation plate made of a thermoplastic resin that has been implemented, and the retardation plate can be applied to liquid crystal display devices and the like. When applied to a liquid crystal display device, it is necessary that the surface opposite to the surface attached to the liquid crystal cell be subjected to a discharge treatment. The measured value of retardation (Δnxd) defined as the product of birefringence (Δn) and thickness (d) is 3.
A second invention provides a composite polarizing plate, characterized in that a polarizing plate is laminated on this surface of a retardation plate made of a thermoplastic resin having a wavelength of 0 to 1200 nm and subjected to discharge treatment on at least one surface, and The composite polarizing plate can be used in liquid crystal display devices and the like. The measured value of retardation (Δn x d) defined as the product of birefringence (Δn) and thickness (d) is 30~
A retardation plate made of a thermoplastic resin with a wavelength of 1200 nm and a small amount (in both cases, the surface opposite to the surface to be pasted to the liquid crystal cell of the liquid crystal display device has been subjected to discharge treatment) is pasted on one side of the liquid crystal cell, A third aspect of the present invention is a liquid crystal display device characterized in that it has a structure in which a pair of polarizing plates are attached to sandwich them.
本発明の位相差板に使用される熱可塑性高分子フィルム
、又はシートの材質としては、透明性、及び適切なレタ
ーデーション（以後、Ｒ値と称する）を得ることが出来
れば、結晶性高分子１．非品性高分子を問わず、いずれ
も適用可能である。例示するならばポリカーボネート系
樹脂、ポリメチルメタクリレート系樹脂、ポリスチレン
系樹脂、ポリアクリロニトリル系樹脂、ポリエチレンテ
レフタレート等のポリエステル系樹脂、酢酸セルロース
等のセルロース系樹脂、ナイロン６およびナイロン６６
等のポリアミド系樹脂、ポリ塩化ビニール系樹脂、ポリ
ビニルアルコールおよびその誘導体、ポリエチレン・ポ
リプロピレン等のポリオレフィン系樹脂、フッ素系樹脂
、ポリサルフォン、ポリエーテルサルフォンおよびこれ
らの変性物から選ばれる少なくとも１種以上の材料があ
げられる。なかでもポリカーボネート系樹脂からなる位
相差板は、透明性が良好であり、かっ１００°Ｃ以上の
耐熱性や耐衝撃性が良好であって、かつ延伸性が良好で
あるため、本発明には特に有効な高分子化合物である。As the material of the thermoplastic polymer film or sheet used for the retardation plate of the present invention, if transparency and appropriate retardation (hereinafter referred to as R value) can be obtained, crystalline polymer 1. Any of these methods can be applied regardless of the non-quality polymer. Examples include polycarbonate resins, polymethyl methacrylate resins, polystyrene resins, polyacrylonitrile resins, polyester resins such as polyethylene terephthalate, cellulose resins such as cellulose acetate, nylon 6 and nylon 66.
At least one or more selected from polyamide resins such as polyvinyl chloride resins, polyvinyl alcohol and derivatives thereof, polyolefin resins such as polyethylene and polypropylene, fluorine resins, polysulfones, polyethersulfones, and modified products thereof. I can give you the materials. Among them, a retardation plate made of polycarbonate resin has good transparency, good heat resistance and impact resistance at temperatures above 100°C, and good stretchability, so it is suitable for the present invention. It is a particularly effective polymer compound.
本発明で使用されるポリカーボネート系樹脂は、主に、
ビスフェノール骨格を有する直鎖状のポリカーボネート
又は共重合ポリカーボネート類等であって、４，４′−
ジヒドロキシジフェニルアルカン、又はこれらのハロゲ
ン置換体からホスゲン法、又はエステル交換法によって
得られものである。４．４’ −ジヒドロキシジフェニ
ルアルカン、又はこれらの置換体を例示するならば、４
．４”−ジヒドロキシジフェニルメタン、４．４゛−ジ
ヒドロキシジフェニルエタン、４，４°−ジヒドロキシ
ジフェニルブタン、４．４”−ジヒドロキシジフェニル
−２゜２−プロパン、３，３−ジブロモ一−４，４”−
ジヒドロキシジフェニル−２，２−プロパン、３．３゛
−ジクロル−４，４°−ジヒドロキシジフェニル−２，
２−プロパン、３．３’ 、５゜５°−テトラブロモ−
４，４゛−ジヒドロキシジフェニル−２，２−プロパン
等があげられる。The polycarbonate resin used in the present invention is mainly
Linear polycarbonates or copolymerized polycarbonates having a bisphenol skeleton, 4,4'-
It is obtained from dihydroxydiphenylalkanes or their halogen-substituted products by the phosgene method or the transesterification method. 4.4'-Dihydroxydiphenylalkane or substituted products thereof are exemplified by 4
．． 4”-dihydroxydiphenylmethane, 4.4°-dihydroxydiphenylethane, 4,4°-dihydroxydiphenylbutane, 4.4”-dihydroxydiphenyl-2°2-propane, 3,3-dibromo-4,4”-
dihydroxydiphenyl-2,2-propane, 3.3゛-dichloro-4,4°-dihydroxydiphenyl-2,
2-propane, 3.3', 5°5°-tetrabromo-
Examples include 4,4'-dihydroxydiphenyl-2,2-propane.
さらにこれらのポリカーボネート系樹脂にスチレン系樹
脂およびその変性物等をブレンドしたものも、本発明に
は有効である。Furthermore, blends of these polycarbonate resins with styrene resins and modified products thereof are also effective in the present invention.
これらのポリカーボネート系樹脂を位相差板とするには
、ポリカーボネート系樹脂を公知の製膜手段すなわち溶
剤キャスト法、カレンダー法、又は押出法でフィルム、
又はシートに成形した後、−軸方向に適度に延伸するこ
とによって達成される。さらに液晶表示装置に用いられ
る本発明の位相差板は、出来るだけ光学主軸が一定して
おり、かつ光学的色ムラが少ないことが好ましい。In order to use these polycarbonate resins as a retardation plate, the polycarbonate resins are formed into a film by a known film forming method, such as a solvent casting method, a calendering method, or an extrusion method.
Alternatively, this can be achieved by forming the sheet into a sheet and then stretching it appropriately in the -axial direction. Further, it is preferable that the retardation plate of the present invention used in a liquid crystal display device has a principal optical axis as constant as possible and has little optical color unevenness.
光学主軸が一定で、かつ光学的色ムラが少ない位相差板
を得るためには原反フィルム又はシートは、厚み精度が
良好であり、できるだけ光学的に均質なものが要求され
る。フィルム又はシートに成形時にダイライン等が発生
することは好ましくない。通常、フィルム又はシートを
成形する際には、微小な配向が発生することが多く、延
伸に先立ってこれらの微小配向を減らすことも好ましい
方法である。延伸前に微小配向を減らす方法としては、
熱処理が有効である。In order to obtain a retardation plate with a constant optical principal axis and little optical color unevenness, the original film or sheet is required to have good thickness accuracy and be as optically homogeneous as possible. It is not preferable that die lines or the like occur on the film or sheet during molding. Normally, when forming a film or sheet, minute orientations often occur, and it is also a preferable method to reduce these minute orientations prior to stretching. As a method to reduce micro-orientation before stretching,
Heat treatment is effective.
本発明の位相差板を製造するために、延伸前にフィルム
又はシートの加熱変形温度付近の温度で熱処理を実施す
る。ポリカーボネート系フィルム又はシートの場合は、
延伸前に１００〜２００℃の温度で０．１〜５分程度熱
処理を実施すると、原反フィルム又はシートの複屈折率
は、実質的にＯとなり、はぼ完全な無配向フィルム又は
シートとなる。In order to produce the retardation plate of the present invention, heat treatment is performed at a temperature near the heating deformation temperature of the film or sheet before stretching. In the case of polycarbonate film or sheet,
If heat treatment is performed at a temperature of 100 to 200°C for about 0.1 to 5 minutes before stretching, the birefringence of the original film or sheet becomes substantially O, resulting in an almost completely non-oriented film or sheet. .
このようにして得られた原反フィルム又はシートを一軸
方向に延伸する方法としてはテンター法による横一軸延
伸法、ロール間圧縮延伸法、周速の異なるロールを利用
する縦−軸延伸法等公知の一軸延伸方法を採用すること
ができる。Methods for stretching the raw film or sheet thus obtained in the uniaxial direction include a transverse uniaxial stretching method using a tenter method, an inter-roll compression stretching method, and a longitudinal-axial stretching method using rolls with different peripheral speeds. The following uniaxial stretching method can be adopted.
本発明において光学的に色ムラが小さ（、レターデーシ
ョンの振れ幅の小さい位相差板を得るためには、延伸前
のフィルム幅Ａと延伸後のフィルム幅Ｂとから定義され
るネックイン率（１００Ｘ （Ａ−Ｂ） ／Ａ）を１０
％以下、好ましくは５％以下、さらに好ましくは実質的
に０に抑える必要がある。従って、本発明において最も
有効な延伸方法は、実質的にネックインの生じないテン
ター法による横一軸延伸方法である。本方式は、ポリカ
ーボネート系樹脂以外の熱可塑性樹脂においても有用で
ある。In the present invention, in order to obtain a retardation plate with optically small color unevenness (and small retardation fluctuation), the neck-in rate (defined from the film width A before stretching and the film width B after stretching) 100X (A-B) /A) 10
% or less, preferably 5% or less, and more preferably substantially 0. Therefore, the most effective stretching method in the present invention is a transverse uniaxial stretching method using a tenter method that does not substantially cause neck-in. This method is also useful for thermoplastic resins other than polycarbonate resins.
テンター法による横一軸延伸においては、−般に予熱工
程、延伸工程、熱処理工程の３工程から成る。予熱工程
は、必ずしも必要ではないが、フィルム又はシートの複
屈折率を実質的に０にする熱処理工程と同じ役割を有す
るので有用である。延伸工程は位相差板とするための最
も大切な工程であり、ポリカーボネート系樹脂の種類、
フィルム又はシートの厚み等によって条件は異なるが、
３０〜１２００ｎｍのＲ値を有する位相差板とするため
には一般的に延伸温度１３０〜２００℃、延伸倍率１．
２〜４．０倍程度である。延伸後の熱処理工程は必ずし
も必要ではないが、得られた延伸フィルム又はシートの
寸法安定性の向上、およびレターデーシゴンの均一性向
上のためには、有用な工程となる。Transverse uniaxial stretching by the tenter method generally includes three steps: a preheating step, a stretching step, and a heat treatment step. Although the preheating step is not necessary, it is useful because it has the same role as the heat treatment step to reduce the birefringence of the film or sheet to substantially zero. The stretching process is the most important process for making a retardation plate, and the type of polycarbonate resin,
Conditions vary depending on the thickness of the film or sheet, etc.
In order to obtain a retardation plate having an R value of 30 to 1200 nm, the stretching temperature is generally 130 to 200°C and the stretching ratio is 1.
It is about 2 to 4.0 times. Although the heat treatment step after stretching is not necessarily necessary, it is a useful step for improving the dimensional stability of the obtained stretched film or sheet and improving the uniformity of the retardation.
ポリカーボネート系樹脂以外の前記熱可塑性樹脂を用い
る場合には、その樹脂の特性に応じた延伸条件を設定し
て延伸を行う必要がある。When using the thermoplastic resin other than polycarbonate resin, it is necessary to set stretching conditions according to the characteristics of the resin and perform the stretching.
本発明でいう光学的な色ムラは、以下に定義されるΔＥ
０で定量的に表示することができる。The optical color unevenness referred to in the present invention is ΔE defined below.
It can be quantitatively displayed as 0.
すなわち、直交ニコル下にその光学−的主軸が、４５度
になるように配置したときのＬ″、ａ′″、ｂｏの値を
Ｊ ｌ５−Ｚ・８７２９ （Ｌ” ａ”、ｂ０表色系お
よびＬｏ、 ′、ｖ０表色系による物体色の表示方法）
に従って分光光度計、又は分光計等により測定する。ｎ
個の異なった場所のサンプルの上記Ｌ″、ａ＊、ｂｏか
ら以下の式により（ΔＥ”）ｉ、ｊを計算する。In other words, the values of L'', a''', and bo when arranged under orthogonal Nicols so that their optical principal axes are at 45 degrees are J l5-Z・8729 (L''a'', b0 color system and how to display object colors using the Lo, ′, v0 color system)
Measure with a spectrophotometer or spectrometer, etc. according to the following. n
(ΔE'')i, j are calculated from the above L'', a*, bo of samples at different locations using the following formula.
（ΔＥ”）ｉ、ｊ
＝（（（ΔＬ” ） ｉ、 ｊ）” ＋ （（６８ｍ
） ｉ、 ｊ）”＋（（Δｂ”）ｉ、ｊ）？） ｌ／ｌ
ただし
くΔＬ” ）ｔ、 ｊ＝（Ｌ“）ｉ−（Ｌ”）ｊ（Δａ
” ）ｔ、ｊ＝（ａ” ）ｉ−（ａ” ）ｊ（Δｂ”）
ｉ、ｊ＝（ｂ” ）ｉ （ｂ” ）ｊｉ ＝ ｌ ％
ｎ
ｊ＝１〜ｎ
ｉ≠ｊ
この（ΔＥ” ）ｉ、ｊの中で最大の値をΔＥ０とする
。測定数ｎは多い方が好ましいが、通常は３０ｃｍ角の
サンプルから無作為に１０ケ所を測定し、上式により計
算する。このΔＥ０が小さい方が光学的色ムラが少ない
ので、出来るだけ小さい方が好ましい。−船釣には３０
程度以下にすることが好ましい。(ΔE”) i, j = (((ΔL”) i, j)” + ((68m
) i, j)”+((Δb”)i, j)? ) l/l where ΔL")t, j=(L")i-(L")j(Δa
”)t,j=(a”)i−(a”)j(Δb”)
i, j=(b”)i (b”)ji=l%
n j = 1 ~ n i≠j The maximum value among these (ΔE") i, j is ΔE0. It is preferable that the number of measurements n be larger, but usually 10 locations are randomly selected from a 30 cm square sample. is measured and calculated using the above formula.The smaller ΔE0 is, the less optical color unevenness will occur, so it is preferable that it be as small as possible.-30 for boat fishing
It is preferable to keep it to a level below.
このようにして、得られた位相差板は、液晶表示装置、
あるいは各種の光学フィルター等に適用される。液晶表
示装置に適用する場合に、液晶セル、あるいは偏光板等
を貼合して使用される。一般に液晶表示装置用の材料は
、８０℃で２００時間程度の耐久促進テストに耐えられ
ることが必要である。そのため該位相差板は、少なくと
も液晶表示装置の液晶セルに貼付される面に対して反対
側の面が放電処理されていることが必要である。さらに
、該位相差板の液晶セルに貼付される面が放電処理され
ていても良い、放電処理としては、コロナ処理、プラズ
マ処理等があり、なかでもコロナ処理は大気中で実施出
来るので特に有用である。In this way, the obtained retardation plate can be used for liquid crystal display devices,
Alternatively, it can be applied to various optical filters. When applied to a liquid crystal display device, it is used by bonding a liquid crystal cell or a polarizing plate or the like. In general, materials for liquid crystal display devices are required to withstand an accelerated durability test of about 200 hours at 80°C. Therefore, it is necessary that at least the surface of the retardation plate opposite to the surface to be attached to the liquid crystal cell of the liquid crystal display device is subjected to a discharge treatment. Furthermore, the surface of the retardation plate that is attached to the liquid crystal cell may be subjected to discharge treatment. Examples of discharge treatment include corona treatment and plasma treatment, and among these, corona treatment is particularly useful because it can be performed in the atmosphere. It is.
該位相差板に、コロナ処理を実施する方法としては、現
在プラスチックフィルム等の表面改質の手段として使用
されている市販の各種コロナ処理機の適用が可能である
。なかでも５ＯＦＴＡＬ （ソフタル）社のマルチナイ
フ電極を有するコロナ処理機は多数本の電極で構成され
、さらに電極の間に空気を送る構造となっており、フィ
ルムの加熱防止やフィルム表面に出て（る低分子の除去
等がおこなえるので、エネルギー効率が非常に高く、高
コロナ処理が可能となるので、本発明には特に有用なコ
ロナ処理機である。As a method for carrying out corona treatment on the retardation plate, it is possible to apply various commercially available corona treatment machines that are currently used as means for surface modification of plastic films and the like. Among them, 5OFTAL's corona treatment machine with multi-knife electrodes is composed of multiple electrodes and has a structure that sends air between the electrodes, which prevents the film from heating and prevents it from coming out on the film surface ( It is a particularly useful corona treatment machine for the present invention because it can remove low molecules, etc., resulting in very high energy efficiency and high corona treatment.
コロナ処理の条件としては、−回当たりの処理に際して
のエネルギー密度としては、２０〜４００ Ｗ −ｍ
ｉ ｎ ／ ｒｔｒ程度である。高エネルギーで処理す
るよりは出来るだけ低エネルギーで処理する方が基材フ
ィルムの劣化、充填物の表面へのブリード等がおさえら
れ、特に有効である。−画処理で不充分な場合は、二回
以上の多数回処理をおこなえばさらに接着力が向上する
。The conditions for corona treatment are as follows: energy density per treatment is 20 to 400 W-m
It is about in/rtr. It is particularly effective to process with as low energy as possible rather than with high energy because it suppresses deterioration of the base film and bleeding of the filler onto the surface. - If the image processing is insufficient, the adhesion strength can be further improved by repeating the processing two or more times.
処理後の表面張力としては一般には４０ｄｙｎｅ／ｃｍ
以上、好ましくは４５ ｄ ｙ ｎ ｅ ／ ｃ ｍ以
上必要であるが、必ずしも表面張力をあげればよいとい
うものでもな（、被着体の種類、使用される粘着剤等の
種類等に応じて該位相差板の表面張力、すなわち最適処
理条件を選定する必要がある。The surface tension after treatment is generally 40 dyne/cm.
As mentioned above, preferably 45 dyne/cm or more is required, but it is not necessarily necessary to increase the surface tension (depending on the type of adherend, the type of adhesive used, etc.) It is necessary to select the surface tension of the retardation plate, that is, the optimum processing conditions.
このようにして得られた位相差板は、液晶表示装置等に
適用することが可能である。The retardation plate thus obtained can be applied to liquid crystal display devices and the like.
本発明になる位相差板は、偏光板の片面に貼合して、複
合偏光板とすることによっても液晶表示装置等に適用す
ることが出来る。The retardation plate of the present invention can also be applied to liquid crystal display devices and the like by laminating it on one side of a polarizing plate to form a composite polarizing plate.
本発明の複合偏光板を構成する偏光板については、任意
の偏光板を用いることが出来る。−例を示せば、ポリビ
ニルアルコール、又はその誘導体からなるフィルムを一
軸に延伸配向させ、偏光素子としてよう素や二色性染料
を吸着させたのち、非旋光性の三酢酸セルロース等のセ
ルロース系フィルムをその両側に貼合したものである。Any polarizing plate can be used as the polarizing plate constituting the composite polarizing plate of the present invention. - For example, a film made of polyvinyl alcohol or a derivative thereof is uniaxially stretched and oriented, iodine or dichroic dye is adsorbed as a polarizing element, and then a non-optically active cellulose film such as cellulose triacetate is formed. is pasted on both sides.
さらには、ポリ塩化ビニルフィルムの脱塩酸、又はポリ
ビニルアルコール系フィルムの脱水処理により得られた
ポリエン系の偏光板、ポリエチレンテレフタレート等の
疎水性樹脂に二色性染料をブレンドし、−軸に配向させ
たタイプの偏光板等を用いることが出来る。なかでも、
ポリビニルアルコールフィルムに９、よう素や二色性染
料を吸着し、−軸に配向した偏光子に三酢酸セルロース
等のセルロース系フィルムを保護フィルムとしてその両
側に貼合したものは１．偏光特性、色相特性の上から好
ましい。Furthermore, dichroic dyes are blended with hydrophobic resins such as polyene polarizing plates, polyethylene terephthalate, etc., obtained by dehydrochloric acid treatment of polyvinyl chloride films, or dehydration treatment of polyvinyl alcohol films, and oriented along the -axis. A type of polarizing plate or the like can be used. Among them,
A polyvinyl alcohol film with 9 adsorbed iodine or dichroic dye, and a polarizer oriented along the -axis with a cellulose film such as cellulose triacetate as a protective film attached on both sides of the polarizer is 1. Preferable from the viewpoint of polarization characteristics and hue characteristics.
本発明の位相差板、及び偏光板を用いて、本発明の複合
偏光板を形成するには偏光板の光学主軸と位相差板の光
学主軸を１５〜７５度、好ましくは３０〜６０度、さら
に好ましくは４０〜５０度の範囲で粘着剤、あるいは接
着剤等を用いて貼り合わせることによって達成される。In order to form the composite polarizing plate of the present invention using the retardation plate and polarizing plate of the present invention, the optical principal axis of the polarizing plate and the optical principal axis of the retardation plate are adjusted by 15 to 75 degrees, preferably 30 to 60 degrees, More preferably, this is achieved by bonding at an angle of 40 to 50 degrees using a pressure-sensitive adhesive or an adhesive.
さらに直線偏光板の片側の保護フィルムを除去し、偏光
子に直接位相差板を接着剤、あるいは粘着剤等を用いて
貼り合わせた構成のもの、保護フィルムの無い、疎水性
高分子フィルムと二色性染料の組合せからなる直線偏光
板の片側に、位相差板を接着剤、あるいは粘着剤等を用
いて貼り合わせた構成のもの等も本発明の複合偏光板の
範囲に含まれるものである。In addition, there are those in which the protective film on one side of the linear polarizing plate is removed and the retardation plate is bonded directly to the polarizer using an adhesive or adhesive, and those in which the protective film on one side of the linear polarizing plate is removed, and those with a hydrophobic polymer film without a protective film. The composite polarizing plate of the present invention also includes a structure in which a retardation plate is bonded to one side of a linear polarizing plate made of a combination of colored dyes using an adhesive or a pressure-sensitive adhesive. .
第１の発明からなる位相差板を液晶分子のねじれ角が９
０度以上、具体的には１８０〜２７０度程度の液晶セル
の片側の面に配置し、それらをはさむようにして、一対
の偏光板を配置するこ １とによって、第３の発明であ
る液晶表示装置を得る。この時、位相差板と偏光板は、
その光学主軸が３０〜６０度、好ましくは４０〜５０度
の範囲になるように貼り合わせることによって、表示品
質が良好となる。一対の偏光板は、その光学主軸を直交
、もしくは直交に逍い状態、又は平行、もしくは平行に
近い状態に配置することによって、良好な表示品質とな
る。In the retardation plate according to the first invention, the twist angle of the liquid crystal molecules is 9
By placing a pair of polarizing plates on one side of a liquid crystal cell at an angle of 0 degrees or more, specifically about 180 to 270 degrees, and sandwiching them, a liquid crystal display, which is the third invention, is obtained. Get the equipment. At this time, the retardation plate and polarizing plate are
Good display quality can be achieved by bonding them together so that their optical principal axes are in the range of 30 to 60 degrees, preferably 40 to 50 degrees. Good display quality can be achieved by arranging the pair of polarizing plates so that their optical principal axes are perpendicular to each other, aligned perpendicularly, parallel to each other, or nearly parallel to each other.
このようにして得られた位相差板、あるいは複合偏光板
は、光学的均質性が良好であると同時に８０℃での耐久
性促進テストに合格出来るものである。従って、これら
を液晶分子のねじれ角が９０度以上、具体的には１８０
〜２７０度程度の液晶表示装置に用いれば高信軌性で、
かつ高品質な白黒表示を有する液晶表示装置が得られる
。その他、各種の光学フィルター等に適用することも可
能である。The retardation plate or composite polarizing plate thus obtained has good optical homogeneity and can pass the accelerated durability test at 80°C. Therefore, the twist angle of the liquid crystal molecules is 90 degrees or more, specifically 180 degrees.
If used in a liquid crystal display device with an angle of ~270 degrees, it will have high reliability,
Moreover, a liquid crystal display device having high quality black and white display can be obtained. In addition, it is also possible to apply it to various optical filters.
：実施例〕
以下、実施例により本発明を説明する。本発明はこれら
に限定されるものではない、なお実施例における位相差
板のレターデーション値の測定は、偏光顕微鏡に備えつ
けたセナルモンコンペンセーターを使用し、光源にはハ
ロゲンランプを用いた。ΔＥ１は分光光度計を用い、前
述の方法で測定、計算した。:Example] The present invention will be explained below with reference to Examples. The present invention is not limited thereto, however, in the examples, the retardation value of the retardation plate was measured using a Senarmont compensator equipped with a polarizing microscope, and a halogen lamp was used as the light source. ΔE1 was measured and calculated using a spectrophotometer using the method described above.
又、実施例における直線偏光板は、例えば特開昭６１−
２０００３号公報に記載されたような方法によって作成
した、ポリビニルアルコールに二色性色素としてよう素
を一軸に吸着配向させたものである。必要に応じて三酢
酸セルロ−ス等の透明な非旋光性高分子フィルムを保護
フィルムとして貼合したものである。In addition, the linear polarizing plate in the embodiment is, for example, disclosed in Japanese Patent Application Laid-Open No. 1986-
It was prepared by the method described in Japanese Patent No. 20003, and iodine was uniaxially adsorbed and oriented as a dichroic dye on polyvinyl alcohol. If necessary, a transparent non-optically active polymer film such as cellulose triacetate is laminated as a protective film.
実施例１〜５
厚さ２００μｍ１幅３００ｍｍの透明ポリカーボネート
フィルム（平均分子量的２７． ＯＯＯ１押出製膜品）
を１９０℃の温度であらかじめ予熱したあと１７５℃の
温度でテンター法による横一軸延伸を行い、厚さ約１０
０μｍ、幅６００ｍｍの延伸フィルムを得た。該延伸フ
ィルムはＲ値が約５６５ｎｍ、ΔＥ０は８．３で均質な
品質を有し、光学的色ムラはほとんど観察されなかった
。該フィルムの表面を表１に示す条件にてコロナ処理を
実施し、本発明の位相差板を得た。この位相差板をアク
リル系粘着剤でガラス板上に貼り付け、さらに位相差板
のコロナ処理面上に粘着剤を用いて偏光板を偏光軸が位
相差板の光学主軸と約４５度になるように貼り付けた。Examples 1 to 5 Transparent polycarbonate film with a thickness of 200 μm and a width of 300 mm (average molecular weight 27.001 extrusion film product)
was preheated at a temperature of 190°C, and then horizontally uniaxially stretched at a temperature of 175°C by a tenter method to a thickness of approximately 10°C.
A stretched film with a diameter of 0 μm and a width of 600 mm was obtained. The stretched film had a homogeneous quality with an R value of about 565 nm and a ΔE0 of 8.3, and almost no optical color unevenness was observed. The surface of the film was subjected to corona treatment under the conditions shown in Table 1 to obtain a retardation plate of the present invention. This retardation plate is pasted on a glass plate using an acrylic adhesive, and then the polarization axis is set at approximately 45 degrees with the optical principal axis of the retardation plate using an adhesive on the corona-treated surface of the retardation plate. I pasted it like this.
このサンプルを８０℃のオーブン中に２００時間保持し
たが、その外観、光学特性に変化は生じなかった。This sample was kept in an oven at 80° C. for 200 hours, but no change occurred in its appearance or optical properties.
比較例１
実施例１の延伸条件で得られたポリカーボネートの延伸
フィルムをコロナ処理をせずに実施例１と同様の方法で
ガラス板上に貼り付け、さらにその上に偏光板を貼り付
けた。このサンプルを８０℃のオーブン中に投入したと
ころ２００時間後に偏光板と位相差板の間に数箇所剥離
が生じ、この条件には耐えられないことが判明した。Comparative Example 1 A stretched polycarbonate film obtained under the stretching conditions of Example 1 was pasted on a glass plate in the same manner as in Example 1 without corona treatment, and a polarizing plate was further pasted thereon. When this sample was placed in an oven at 80° C., peeling occurred in several places between the polarizing plate and the retardation plate after 200 hours, and it was found that the sample could not withstand these conditions.
実施例６〜１０
厚さ２００μｍ、幅３００ｍｍの透明ポリカーボネート
フィルム（平均分子量的２３．０００、押出製膜島）を
１９０℃の温度であらかじめ予熱したあと１７５°Ｃの
温度でテンター法による横一軸延伸を行い厚さ約１４０
μｍ、輻４３０ｍｍの延伸フィルムを得た。該延伸フィ
ルムはＲ値が約３００ｎｍ、ΔＥ０は１１．５で均質な
品質を有し、光学的色ムラはほとんど観察されなかった
。該フィルムの表面を表１に示す条件にてコロナ処理を
実施し、本発明の位相差板を得た。この位相差板を実施
例１と同様の方法でガラス板上に貼り付け、さらにその
コロナ処理面上に偏光板を貼り付けた。このサンプルを
８０℃のオーブン中に２００時間保持したが、その外観
、光学特性に変化は生じなかった。Examples 6 to 10 A transparent polycarbonate film (average molecular weight: 23.000, extrusion film) with a thickness of 200 μm and a width of 300 mm was preheated at a temperature of 190°C, and then horizontally uniaxially stretched at a temperature of 175°C by a tenter method. Make the thickness about 140
A stretched film with a width of 430 mm and a width of 430 mm was obtained. The stretched film had a homogeneous quality with an R value of about 300 nm and a ΔE0 of 11.5, and almost no optical color unevenness was observed. The surface of the film was subjected to corona treatment under the conditions shown in Table 1 to obtain a retardation plate of the present invention. This retardation plate was attached to a glass plate in the same manner as in Example 1, and a polarizing plate was further attached to the corona-treated surface. This sample was kept in an oven at 80° C. for 200 hours, but no change occurred in its appearance or optical properties.
比較例２
実施例６の延伸条件で得られたポリカーボネートの延伸
フィルムをコロナ処理をせずに実施例１と同様の方法で
ガラス板上に貼り付け、さらにその上に偏光板を貼り付
けた。このサンプルを８０℃のオーブン中に投入したと
ころ２００時間後に比較例１と同様の剥離が生じ、この
条件には耐えられないことが判明した。Comparative Example 2 A stretched polycarbonate film obtained under the stretching conditions of Example 6 was pasted on a glass plate in the same manner as in Example 1 without corona treatment, and a polarizing plate was further pasted thereon. When this sample was placed in an oven at 80° C., peeling similar to that in Comparative Example 1 occurred after 200 hours, indicating that it could not withstand these conditions.
実施例１１〜１５
実施例１〜５と同じ原反（透明ポリカーボネートフィル
ム）を用いて、１９０°Ｃの温度であらかじめ予熱した
あと、１７０℃の温゛度でテンター法による横一軸延伸
を行い、厚さ約１２０μｍの延伸フィルムを得た。該延
伸フィルムは、Ｒ値が約７５０ｎｍ、ΔＥ１は７．１で
均質な品質を有し、光学的色ムラはほとんど観察されな
かった。該フィルムの表面を表１に示す条件にてコロナ
処理を実施し、本発明の位相差板を得た。この位相差板
を実施例１と同様の方法でガラス板上に貼り付け、さら
にそのコロナ処理面上に偏光板を貼り付けた。このサン
プルを８０℃のオーブン中に２００時間保持したが、そ
の外観、光学特性に変化は生じなかった。Examples 11 to 15 Using the same original film (transparent polycarbonate film) as in Examples 1 to 5, after preheating at a temperature of 190°C, transverse uniaxial stretching was performed by a tenter method at a temperature of 170°C. A stretched film with a thickness of about 120 μm was obtained. The stretched film had a homogeneous quality with an R value of about 750 nm and a ΔE1 of 7.1, and almost no optical color unevenness was observed. The surface of the film was subjected to corona treatment under the conditions shown in Table 1 to obtain a retardation plate of the present invention. This retardation plate was attached to a glass plate in the same manner as in Example 1, and a polarizing plate was further attached to the corona-treated surface. This sample was kept in an oven at 80° C. for 200 hours, but no change occurred in its appearance or optical properties.
実施例１６〜２０
ポリカーボネート（分子量的１６．０００）とスチレン
／無水マレイン酸共重合体（スチレン／無水マレイン酸
（重量比）−９２／８）を重量比で８５対１５に均一に
ブレンドした組成からなる厚さ２００μｍ１幅３００ｍ
ｍの透明フィルムを、１８０℃の温度であらかじめ予熱
したあと、１５５℃の温度でテンター法による横−軸延
伸を行い、厚さ約１３５μｍ、幅４５０ｍｍの透明フィ
ルムを得た。該延伸フィルムは、Ｒ値が約５４０ｎｍ、
ΔＥ′″は７．５で均質な品質を有し、光学的色ムラは
ほとんど観察されなかった。該フィルムの表面を表１に
示す条件にてコロナ処理を実施し、本発明の位相差板を
得た。この位相差板を実施例１と同様の方法でガラス板
上に貼り付け、さらにそのコロナ処理面上に偏光板を貼
り付けた。このサンプルを８０°Ｃのオーブン中に２０
０時間保持したが、その外観、光学特性に変化は生じな
かった。Examples 16-20 A composition in which polycarbonate (molecular weight 16.000) and styrene/maleic anhydride copolymer (styrene/maleic anhydride (weight ratio) -92/8) were uniformly blended at a weight ratio of 85:15. consisting of 200μm thick and 300m wide
After preheating the transparent film of No. m at a temperature of 180° C., transverse-axial stretching was performed by a tenter method at a temperature of 155° C. to obtain a transparent film with a thickness of about 135 μm and a width of 450 mm. The stretched film has an R value of about 540 nm,
ΔE′″ was 7.5, showing homogeneous quality, and almost no optical color unevenness was observed. The surface of the film was corona treated under the conditions shown in Table 1, and the retardation plate of the present invention was This retardation plate was attached to a glass plate in the same manner as in Example 1, and a polarizing plate was further attached to the corona-treated surface.This sample was placed in an oven at 80°C for 20 minutes.
Although it was held for 0 hours, no change occurred in its appearance or optical properties.
実施例２１
実施例１で得た位相差板を液晶分子のねじれ角が２００
度である液晶表示装置の液晶セルと上偏光板の間に粘着
剤を介して貼合して使用したところ、背景色が白、表示
部が黒のほぼ白黒表示が可能となり、虹模様等色ムラは
無（、良好な表示品質の液晶表示装置が得られた。Example 21 The retardation plate obtained in Example 1 was used with a twist angle of liquid crystal molecules of 200
When used by bonding the liquid crystal cell and the upper polarizing plate of a liquid crystal display device using an adhesive via an adhesive, it was possible to display a nearly black and white display with a white background and a black display area, and the rainbow-like color unevenness was eliminated. A liquid crystal display device with good display quality was obtained.
該液晶表示装置を８０℃に２００時間保持したあとも、
何ら異常は認められず、初期光学特性と比較して表示品
質の低下はなかった。Even after holding the liquid crystal display device at 80°C for 200 hours,
No abnormalities were observed, and there was no deterioration in display quality compared to the initial optical characteristics.
比較例３
実施例１の延伸条件で得られたポリカーボネートの延伸
フィルムを、コロナ処理をせずに実施例２１と同様に液
晶分子のねじれ角が２００度である液晶表示装置の液晶
セルと上偏光板の間に粘着剤を介して貼合したところ、
背景色が白、表示部が黒のほぼ白黒表示が可能となり、
虹模様等色ムラは無く、良好な表示品質の液晶表示装置
が得られた。Comparative Example 3 A stretched polycarbonate film obtained under the stretching conditions of Example 1 was treated with a liquid crystal cell of a liquid crystal display device in which the twist angle of the liquid crystal molecules is 200 degrees and upper polarized light in the same manner as in Example 21 without corona treatment. When pasted together with adhesive between the boards,
Almost black and white display with white background and black display is now possible.
A liquid crystal display device with good display quality and no rainbow pattern unevenness was obtained.
しかしながら、該液晶表示装置を８０″Ｃに、２００時
間保持したところ、位相差板と偏光板の間に数箇所剥離
が発生し、初期光学特性と比較して表示品質が著しく低
下した。However, when the liquid crystal display device was kept at 80''C for 200 hours, peeling occurred in several places between the retardation plate and the polarizing plate, and the display quality was significantly deteriorated compared to the initial optical characteristics.
実施例２２
実施例１の方法で得られた位相差板のコロナ処理を施し
た面に粘着剤を介して偏光板を貼合して複合偏光板を得
た。該複合偏光板を液晶分子のねじれ角が２００度であ
る液晶表示装置の上偏光板として位相差板が液晶セル側
になるようにして粘着剤を介して貼合したところ、背景
色が白、表示部が黒のほぼ白黒表示が可能となり、虹模
様等色ムラは無く、表示品質の良好な液晶表示装置が得
られた。Example 22 A polarizing plate was bonded to the corona-treated surface of the retardation plate obtained by the method of Example 1 via an adhesive to obtain a composite polarizing plate. When the composite polarizing plate was laminated with an adhesive as the upper polarizing plate of a liquid crystal display device in which the twist angle of liquid crystal molecules is 200 degrees, with the retardation plate facing the liquid crystal cell side, the background color was white. A liquid crystal display device with good display quality was obtained, with the display section being able to display almost black and white, without rainbow pattern color unevenness.
該液晶表示装置を８０”Ｃに２００時間保持したあとも
、何ら異常は認められず、初期光学特性と比較して表示
品質の低下は無かった。Even after the liquid crystal display device was maintained at 80''C for 200 hours, no abnormality was observed, and there was no deterioration in display quality compared to the initial optical characteristics.
比較例４
コロナ処理を実施しない以外は、実施例２２・と同様に
して、複合偏光板を得た。該複合偏光板を液晶分子のね
じれ角が２００度である液晶表示装置の上偏光板として
位相差板が液晶セル側になるようにして粘着剤を介して
貼合したところ、背景色が白、表示部が黒のほぼ白黒表
示が可能となり、虹模様等色ムラは無（、表示品質は著
しく同上した。Comparative Example 4 A composite polarizing plate was obtained in the same manner as in Example 22, except that the corona treatment was not performed. When the composite polarizing plate was laminated with an adhesive as the upper polarizing plate of a liquid crystal display device in which the twist angle of liquid crystal molecules is 200 degrees, with the retardation plate facing the liquid crystal cell side, the background color was white. The display area was able to display almost black and white, and there was no rainbow pattern uniform color unevenness (although the display quality was significantly the same as above).
しかしながら、該液晶表示装置を８０ ”Ｃに、２００
時間保持したところ、位相差板と偏光板の間に数箇所剥
離が発生し、初期光学特性と比較して表示品質が著しく
低下した。However, when the liquid crystal display device is heated to 80"C, 200"
When the film was maintained for a certain period of time, peeling occurred at several places between the retardation plate and the polarizing plate, and the display quality was significantly deteriorated compared to the initial optical properties.
Claims (3)
レターデーション（Δｎ×ｄ）の測定値が３０〜１２０
０ｎｍであって少なくとも一方の面が放電処理されてい
ることを特徴とする熱可塑性樹脂からなる位相差板。(1) The measured value of retardation (Δn×d) defined as the product of birefringence (Δn) and thickness (d) is 30 to 120.
1. A retardation plate made of a thermoplastic resin having a thickness of 0 nm and having at least one surface subjected to a discharge treatment.
レターデーション（Δｎ×ｄ）の測定値が３０〜１２０
０ｎｍであって少なくとも一方の面が放電処理されてい
る熱可塑性樹脂からなる位相差板と、この面に偏光板を
貼合したことを特徴とする複合偏光板。(2) The measured value of retardation (Δn×d) defined as the product of birefringence (Δn) and thickness (d) is 30 to 120.
1. A composite polarizing plate comprising: a retardation plate made of a thermoplastic resin having a thickness of 0 nm and having at least one surface subjected to discharge treatment; and a polarizing plate bonded to this surface.
レターデーション（Δｎ×ｄ）の測定値が３０〜１２０
０ｎｍであって少なくとも液晶表示装置の液晶セルに貼
付される面と反対側の面が放電処理されている熱可塑性
樹脂からなる位相差板を液晶セルの片側の面に貼付し、
それらをはさむようにして一対の偏光板を貼付した構造
を有することを特徴とする液晶表示装置。(3) The measured value of retardation (Δn×d) defined as the product of birefringence (Δn) and thickness (d) is 30 to 120.
A retardation plate made of a thermoplastic resin having a thickness of 0 nm and at least the surface opposite to the surface to be affixed to the liquid crystal cell of the liquid crystal display device is subjected to discharge treatment is affixed to one surface of the liquid crystal cell,
A liquid crystal display device characterized in that it has a structure in which a pair of polarizing plates are attached to sandwich them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63052455A JPH01225916A (en) | 1988-03-04 | 1988-03-04 | Phase difference plate and composite polarizing plate and liquid crystal display device using phase difference plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63052455A JPH01225916A (en) | 1988-03-04 | 1988-03-04 | Phase difference plate and composite polarizing plate and liquid crystal display device using phase difference plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01225916A true JPH01225916A (en) | 1989-09-08 |
Family
ID=12915192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63052455A Pending JPH01225916A (en) | 1988-03-04 | 1988-03-04 | Phase difference plate and composite polarizing plate and liquid crystal display device using phase difference plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01225916A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01230018A (en) * | 1988-03-10 | 1989-09-13 | Seiko Epson Corp | Manufacture of liquid crystal display device |
| JPH0470601U (en) * | 1990-10-30 | 1992-06-23 | ||
| JPH06194646A (en) * | 1992-12-25 | 1994-07-15 | Fuji Photo Film Co Ltd | Tn type liquid crystal display element provided with optical compensation film |
| WO2008081651A1 (en) * | 2006-12-28 | 2008-07-10 | Nitto Denko Corporation | Process for producing polarizer, polarizer, polarizing plate, optical film, process for producing composite polarizing plate, composite polarizing plate, and image display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5835511A (en) * | 1981-08-27 | 1983-03-02 | Ricoh Co Ltd | Liquid crystal display element |
| JPS6141122A (en) * | 1984-07-31 | 1986-02-27 | Toyobo Co Ltd | Electrode substrate for liquid crystal display panel |
| EP0246842A2 (en) * | 1986-05-19 | 1987-11-25 | Seiko Epson Corporation | A liquid crystal display device |
| JPS635322A (en) * | 1986-06-26 | 1988-01-11 | Toshiba Corp | Production of liquid crystal display device |
-
1988
- 1988-03-04 JP JP63052455A patent/JPH01225916A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5835511A (en) * | 1981-08-27 | 1983-03-02 | Ricoh Co Ltd | Liquid crystal display element |
| JPS6141122A (en) * | 1984-07-31 | 1986-02-27 | Toyobo Co Ltd | Electrode substrate for liquid crystal display panel |
| EP0246842A2 (en) * | 1986-05-19 | 1987-11-25 | Seiko Epson Corporation | A liquid crystal display device |
| JPS635322A (en) * | 1986-06-26 | 1988-01-11 | Toshiba Corp | Production of liquid crystal display device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01230018A (en) * | 1988-03-10 | 1989-09-13 | Seiko Epson Corp | Manufacture of liquid crystal display device |
| JP2552167B2 (en) * | 1988-03-10 | 1996-11-06 | セイコーエプソン株式会社 | Liquid crystal display device condition setting method |
| JPH0470601U (en) * | 1990-10-30 | 1992-06-23 | ||
| JPH06194646A (en) * | 1992-12-25 | 1994-07-15 | Fuji Photo Film Co Ltd | Tn type liquid crystal display element provided with optical compensation film |
| WO2008081651A1 (en) * | 2006-12-28 | 2008-07-10 | Nitto Denko Corporation | Process for producing polarizer, polarizer, polarizing plate, optical film, process for producing composite polarizing plate, composite polarizing plate, and image display device |
| US8305547B2 (en) | 2006-12-28 | 2012-11-06 | Nitto Denko Corporation | Method of manufacturing polarizer, polarizer, polarizing plate, optical film, method of manufacturing composite polarizing plate, composite polarizing plate and image display |
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