JPH0242406A - Phase difference plate and composite polarizing plate formed by using this plate and liquid crystal display device - Google Patents
Phase difference plate and composite polarizing plate formed by using this plate and liquid crystal display deviceInfo
- Publication number
- JPH0242406A JPH0242406A JP16211488A JP16211488A JPH0242406A JP H0242406 A JPH0242406 A JP H0242406A JP 16211488 A JP16211488 A JP 16211488A JP 16211488 A JP16211488 A JP 16211488A JP H0242406 A JPH0242406 A JP H0242406A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- film
- retardation plate
- value
- retardation
- 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.)
- Granted
Links
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- 229910052708 sodium Inorganic materials 0.000 claims description 5
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- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 239000004800 polyvinyl chloride Substances 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
- 239000004793 Polystyrene Substances 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
- 229910052740 iodine Inorganic materials 0.000 description 3
- 239000011630 iodine Substances 0.000 description 3
- 229920002492 poly(sulfone) Polymers 0.000 description 3
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- 229920002223 polystyrene Polymers 0.000 description 3
- 229910000077 silane Inorganic materials 0.000 description 3
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- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
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- 239000005977 Ethylene Substances 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 2
- 229910052776 Thorium Inorganic materials 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- DHBDWLUINDGVOJ-UHFFFAOYSA-N ClCCCl.F.F.F Chemical compound ClCCCl.F.F.F DHBDWLUINDGVOJ-UHFFFAOYSA-N 0.000 description 1
- 208000005156 Dehydration Diseases 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000005264 High molar mass liquid crystal Substances 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
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- 208000000474 Poliomyelitis Diseases 0.000 description 1
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- 239000004721 Polyphenylene oxide Substances 0.000 description 1
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- 238000001125 extrusion Methods 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
- 125000005843 halogen group Chemical group 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
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000002560 nitrile group Chemical group 0.000 description 1
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- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 150000004291 polyenes Chemical class 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
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- 229920005672 polyolefin resin Polymers 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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Landscapes
- Liquid Crystal (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Polarising Elements (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野〕
本発明は新規な位相差板、およびこれを用いた複合偏光
板ならびに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 novel retardation plate, a composite polarizing plate using the same, and a liquid crystal display device.
C従来技術]
位相差板とは、複屈折性を有するフィルムまたはシート
状物である。位相差板を透過した光は互いに直交する二
方向の屈折率が違うために透過後において直交する光線
の位相差が生じる。C. Prior Art] A retardation plate is a film or sheet-like material having birefringence. Since the light that has passed through the retardation plate has different refractive indexes in two orthogonal directions, a phase difference occurs between the orthogonal rays after passing through the retardation plate.
位相差板として現在市販され実用に供されているものと
して入射光線の波長λに対して1/4λの位相差を生じ
る機能を有するいわゆる17゜λ板がある。この従来の
1/4λ板は酢酸セルロース系のフィルムを一軸方向に
延伸処理したものである。As a retardation plate currently commercially available and in practical use, there is a so-called 17° λ plate which has the function of producing a phase difference of 1/4 λ with respect to the wavelength λ of an incident light beam. This conventional 1/4λ plate is made by uniaxially stretching a cellulose acetate film.
1/41板は直線偏光板の光学軸に対して、45度傾け
て貼合わせると円偏光板となり、反射光をカットする防
眩機能があるのでVDTフィルターをはじめとして各種
の防眩材料に使用されている。A 1/41 plate becomes a circularly polarizing plate when laminated at a 45 degree angle with respect to the optical axis of a linear polarizing plate.It has an anti-glare function that cuts reflected light, so it is used in various anti-glare materials including VDT filters. has been done.
1/4λ板を構成する高分子材料としては上記のセルロ
ース系樹脂以外にも、塩化ビニル系樹脂(特公昭46−
84477号公報、特開昭56−125702号公報)
、ギリカーポネート系tM脂(特公昭41−12190
号公報、特開昭56−180703号公報)、アクリロ
ニトリル系樹脂(特開昭56−180702号公報)、
スチレン系樹脂(特開昭56−125708号公報)、
ポリオレフィン系樹脂(特開昭60−24502号公報
)などのものが提案されているが、いずれもレターデー
ジ四ンの測定値が185 nm付近のいわゆる1/4λ
板である。なおレターデージ替ン値(以下R値と略すこ
とがある)とは、フィルムまたはシートの厚さ(d)と
該フィルムの複屈折率(△n)の積、すなわち開閉60
−26822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、液晶セルの両側に一対の偏光
板をその吸収軸が直交または平行になるように配置され
た液晶表示装!!!(一般にTN型液晶表示装置といわ
れる)において片一方の偏光板と液晶セルの間に位相差
板を適用して表示品質を向上させようとする試みもある
。さらに近年、表示容量の増大、表示画面の拡大の要請
にともなって、液晶分子のねじれ角を180〜270度
程度にした液晶表示装置(一般にS ’I’ N型液晶
表示装置といわれている)が開発された。このSTN型
液晶表示装置においては液晶分子の複屈折に起因する着
色が生じ白黒表示ができない。−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 addition to the above-mentioned cellulose resins, vinyl chloride resins (PTK
(No. 84477, Japanese Unexamined Patent Publication No. 125702/1984)
, Glycarbonate-based tM fat (Special Publication No. 41-12190
(Japanese Patent Application Laid-Open No. 56-180703), acrylonitrile resin (Japanese Patent Application Laid-open No. 56-180702),
Styrene resin (Japanese Unexamined Patent Publication No. 125708/1983),
Polyolefin resins (Japanese Unexamined Patent Publication No. 60-24502) have been proposed, but all of them have a retardage value of around 185 nm, so-called 1/4λ.
It is a board. Note that the retardage value (hereinafter sometimes abbreviated as R value) is the product of the thickness (d) of the film or sheet and the birefringence (△n) of the film, that is, the opening/closing 60
As described in Japanese Patent No. 26822, a liquid crystal display device in which the twist angle of liquid crystal molecules is 90 degrees and a pair of polarizing plates are arranged on both sides of a liquid crystal cell so that their absorption axes are perpendicular or parallel! ! ! There has also been an attempt to improve display quality by applying a retardation plate between one polarizing plate and a liquid crystal cell in a liquid crystal display device (generally referred to as a TN type liquid crystal display device). Furthermore, in recent years, with the demand for increased display capacity and enlarged display screens, liquid crystal display devices (generally referred to as S 'I' N type liquid crystal display devices) in which the twist angle of liquid crystal molecules is approximately 180 to 270 degrees have been developed. was developed. In this STN type liquid crystal display device, coloring occurs due to birefringence of liquid crystal molecules, and black and white display cannot be performed. - 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なう際に制約を
受けることが多い。この問題を解決するために、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 multicolor or full color. In order to solve this problem, for example, as described in Nikkei Microdevice October 1987 issue, page 84, an additional achromatic liquid crystal cell is added to the STN type liquid crystal cell as an optical compensator to prevent coloring. resolved,
A method is shown to enable black and white display.
[発明が解決しようとする課題]
前記した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る方法は、着色を解消し白黒
表示は可能になるが、(1)値段が高く経済性に劣る、
(2)重< 、 (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、これらの課題を合わせ
解決することが要請されている。[Problems to be Solved by the Invention] A method of adding another achromatic liquid crystal cell as an optical compensator to the STN type liquid crystal cell described above eliminates coloring and makes black and white display possible, but (1) it is expensive; is high and is less economical,
There are problems such as (2) weight and (3) thickness, and in addition to improving the display performance described above, it is required to solve these problems in combination.
またこの色消し用の液晶セルの代わりに位相差板を用い
ることも原理的には考え得るが、従来のl/4λ板では
、(1)光学的にレターデーション値が合わない。(2
)光学軸が一定していない。Although it is theoretically conceivable to use a retardation plate instead of this achromatic liquid crystal cell, with the conventional l/4λ plate, (1) the retardation value does not match optically. (2
) The optical axis is not constant.
(3)光学的色ムラが大きく均質な白黒表示が達成され
ない。などの理由化より前記した液晶表示装置をはじめ
とする新らしい用途に適用することができない。(3) Optical color unevenness is large and homogeneous black and white display cannot be achieved. For these reasons, it cannot be applied to new uses such as the above-mentioned liquid crystal display device.
[課題を解決するための手段]
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
のであり、次のとおりのものである。[Means for Solving the Problems] The present invention has been completed as a result of repeated research in view of the above points, and is as follows.
(1)熱可塑性高分子フィルムまたはシートを一軸に延
伸して形成されるフィルムまたはシートであって、複屈
折率(△n)と厚み(d)の積で定義されるレターデー
ジ四ン(Δn×d)の測定値が80〜1200 nmの
範囲にあり、かつ、該フィルムまたはシートラ直交ニコ
ル下にその光学軸が45度になるように配置して測定し
たときの色差(△E*)が80以下であることを特徴と
する位相差板。(1) A film or sheet formed by uniaxially stretching a thermoplastic polymer film or sheet, which has a retardage (Δn × The measured value of d) is in the range of 80 to 1200 nm, and the color difference (ΔE*) is 80 when measured with the optical axis of the film or sheetra placed under crossed nicols at 45 degrees. A retardation plate characterized by the following:
(2)熱可塑性高分子フィルムまたはシートをネックイ
ン率が10%以下となるように一軸方向に延伸して形成
される高分子フィルム又はシートであって、複屈折率(
△n)と厚み(d)の積で定義されるレターデーション
(△nXd)の測定値が200〜1000 nmの範囲
にあり、かつ、該フィルムまたはシートを直交ニコル下
にその光学軸が45度になるように配置して測定したと
きの色差(△E*)が20以下であることを特徴とする
位相差板。(2) A polymer film or sheet formed by stretching a thermoplastic polymer film or sheet in the uniaxial direction so that the neck-in rate is 10% or less, and which has a birefringence (
The measured value of retardation (△nXd) defined as the product of △n A retardation plate having a color difference (ΔE*) of 20 or less when measured by arranging it so that
(3)式(1)にて定義されるα値が1.0 !以上で
ある特許請求の範囲wi1項記載の位相差板。(3) The α value defined by equation (1) is 1.0! The retardation plate according to claim wi1, which is the above.
RF
α=百・・・・・・・・・・・・・・・・・・・・・・
・・・・・(1)ここで RF:ナトリウムF線(48
6,1nm)で測定したレターデーション
値。RF α=100・・・・・・・・・・・・・・・・・・
...(1) Here RF: Sodium F ray (48
Retardation value measured at 6.1 nm).
RD:ナトリウAD線(589,8nm)で測定したレ
ターデージ璽ン
値。RD: Retardage value measured with Natriu AD line (589, 8 nm).
(4)特許請求の範囲第1項記載の位相差板を偏光板に
積層してなる複合偏光板。(4) A composite polarizing plate obtained by laminating the retardation plate according to claim 1 on a polarizing plate.
(5)特許請求の範囲第1項記載の位相差板を液晶セル
の片側の面に積層し、それを挟むようにして一対の偏光
板を積層してなる液晶表示装置。(5) A liquid crystal display device in which the retardation plate according to claim 1 is laminated on one side of a liquid crystal cell, and a pair of polarizing plates are laminated to sandwich the retardation plate.
本発明の位相差板は適切なレターデージ、ン値を有しか
つ光学的にも色ムラの少ない新規な位相差板に関する。The retardation plate of the present invention relates to a new retardation plate that has appropriate retardage and n value and is optically less uneven in color.
レターデーション値は30〜l 200 nmの範囲の
ものが用いられるが、好ましくは200〜10001m
の範囲に調節される。具体的な用途に応じてさらに適切
なレターデーシラン値が選択される。例えば、レターデ
ーション値として、200〜350 nmの範囲のもの
、及び475〜6251mの範囲のものを液晶表示装置
用として例示することができる。The retardation value used is in the range of 30 to 1200 nm, preferably 200 to 10001 m.
is adjusted within the range of A more appropriate letter silane value is selected depending on the specific application. For example, retardation values in the range of 200 to 350 nm and those in the range of 475 to 6251 m can be exemplified for use in liquid crystal display devices.
また本発明にあっては、熱可塑性フィルムまたはシート
を一軸に延伸して位相差板を形成するに際し、該位相差
板を直交ニコル下にその光学軸が45度になるように配
置して測定したときの色差(△E*)を80以下、好ま
しくは20以下に制御することにより光学的色ムラのな
い優れた位相差板を得ることができることを見出した。In addition, in the present invention, when forming a retardation plate by stretching a thermoplastic film or sheet uniaxially, the retardation plate is placed under crossed Nicols so that its optical axis is at an angle of 45 degrees, and measurement is performed. It has been found that by controlling the color difference (ΔE*) to 80 or less, preferably 20 or less, an excellent retardation plate without optical color unevenness can be obtained.
本発明の位相差板に用いられる熱可塑性樹脂としてはフ
ィルムまたはシートに形成されたとき、上記の特性を満
足し、かつ、400へ700nmの可視光線波長域にお
ける平均の透過率が50%以上、好ましくは80%以上
、さらに好ましくは85%以上を示すものであればとく
に限定されずに本発明に適用し得る。The thermoplastic resin used in the retardation plate of the present invention satisfies the above characteristics when formed into a film or sheet, and has an average transmittance of 50% or more in the visible light wavelength range of 400 to 700 nm. It can be applied to the present invention without particular limitation as long as it shows preferably 80% or more, more preferably 85% or more.
例示するならば、ポリメチルメタクリレート、メタクリ
ル酸メチルを主成分とし他のエチレン系コモノマーを共
重合させて得られるメタクリル酸メチル、共重合体等の
ポリ(メタ)アクリレート系樹脂rポリスチレン、スチ
レン共重合体とし他のエチレン系コモノマーを共N合さ
せて得られるスチレン共重合体等のポリスチレン系樹脂
、ポリアクリロニトリル、アクリロニトリル共重合体等
のアクリロニトリル系樹脂、ポリエチレンテレフタレー
ト、ポリエステル共重合体等のポリエステル系樹脂、ナ
イロン6、ナイロン66等のポリアミド系樹脂、ポリ塩
化ビニル、塩化ビニル共重合体等のポリ塩化ビニル系樹
脂、ポリエチレン、ポリプロピレン、エチレン共重合体
、プロピレン共重合体等のポリオ性物、およびこれらの
樹脂に高分子液晶または低分子液晶等の透明な低分子化
合物または透明な無機化合物をブレンドしたものから選
ばれる少なくとも1種以上の樹脂材料があげられる。Examples include polymethyl methacrylate, methyl methacrylate obtained by copolymerizing methyl methacrylate with other ethylene comonomers, poly(meth)acrylate resins such as copolymers, polystyrene, and styrene copolymers. Polystyrene resins such as styrene copolymers obtained by co-N-merging with other ethylene comonomers, acrylonitrile resins such as polyacrylonitrile and acrylonitrile copolymers, polyester resins such as polyethylene terephthalate and polyester copolymers. , polyamide resins such as nylon 6 and nylon 66, polyvinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymers, polio-based materials such as polyethylene, polypropylene, ethylene copolymers, and propylene copolymers; At least one resin material selected from the group consisting of a transparent low-molecular compound such as a polymeric liquid crystal or a low-molecular liquid crystal, or a transparent inorganic compound blended with the resin described above is mentioned.
ナカでも、好ましい樹脂としてプリエチレンテレフタレ
ート、ポリエステル共重合体等のポリエステル系樹脂、
ポリサルフォン、ポリ塩化本発明の位相差板は液晶表示
装置の表示品質を向上させるため、下記の式(1)で定
義されるα値が1.00以上、好ましくは1.08以上
を示す熱可塑性樹脂を用いる。Preferred resins include polyester resins such as polyethylene terephthalate and polyester copolymers.
Polysulfone, polychloride In order to improve the display quality of a liquid crystal display device, the retardation plate of the present invention is a thermoplastic material having an α value defined by the following formula (1) of 1.00 or more, preferably 1.08 or more. Uses resin.
ここで、
RF:ナトリウAF線(486,1nm)で測定したレ
ターデーション値
Rp:+トリウムD線(589,8nm)で測定したレ
ターデージ奮ン値
位相差板をSTN型液晶表示装置に適用した場合の表示
品質のα値依存性について例を用いて説明する。Here, RF: Retardation value measured with Thorium AF line (486, 1 nm) Rp: + Retardation value measured with Thorium D line (589, 8 nm) When the retardation plate is applied to an STN type liquid crystal display device The dependence of the display quality on the α value will be explained using an example.
平行ニコル下に光学軸に対して45度に複屈折体が存在
する場合の該光学系の光の透過率(T)は下記の式(2
)によって表わされる。When a birefringent body exists at 45 degrees with respect to the optical axis under parallel Nicols, the light transmittance (T) of the optical system is expressed by the following formula (2
).
πRr
T= Tr x Tp x cos” −λ
Tr:複屈折体の透過率
Tp:偏光板2枚を平行状態に配置したときの透過率
RY−二複屈折体のレターデーシラン(nm)λ:光の
波長(nm)
液晶のねじれ角を約200度とし、液晶の複屈折率と厚
さの積(△nxd )の値が約8501mである′液晶
セルの両側に1対の偏光板を平行ニコル状態で配置し、
かつ、上偏光板と液晶セルの間に偏光軸に対して約45
度に位相差板(レターデージ四ンは約5501m )を
配置した構成からなるSTN型液晶表示装置は表示品質
が向上する。すなわち着色がなくなり、背景色が白色に
なる。背景色ができるだけ鮮明な白色を呈するものが、
表示品質として優れており好ましく、式(2)において
は可視光の波長域において光の透過率が一定になる条件
、すなわちT=一定となれば背景色が完全な白色となる
。πRr T= Tr x Tp x cos” -λ Tr: Transmittance Tp of birefringent material: Transmittance RY when two polarizing plates are arranged in parallel - Retardation silane (nm) of birefringent material λ: Wavelength of light (nm) The twist angle of the liquid crystal is approximately 200 degrees, and the product of the birefringence and thickness of the liquid crystal (△nxd) is approximately 8501 m. A pair of polarizing plates are placed in parallel on both sides of the liquid crystal cell. Placed in Nicol state,
And, between the upper polarizing plate and the liquid crystal cell, there is a distance of about 45 mm with respect to the polarization axis.
An STN type liquid crystal display device having a retardation plate (retardage of about 5501 m) is improved in display quality. In other words, the coloring disappears and the background color becomes white. The one with the clearest possible white background color is
This is preferable because it is excellent in display quality, and in equation (2), if the light transmittance is constant in the wavelength range of visible light, that is, if T=constant, the background color becomes completely white.
式(2)においてT=一定となる条件は、で島って、液
晶セルと位相差板の複合体のレターデージ、ン、Reは
となり、Rの値が光の波長λによって変化し、式(4)
に示されるように、液晶セルのRが位相差板のRによっ
て補償されて、可視光のすべての波長域でT=一定とな
れば、完全な白色の背景色となり表示品質が良好となる
。In formula (2), the conditions for T = constant are: The retardage, N, Re of the composite of the liquid crystal cell and the retardation plate is such that the value of R changes depending on the wavelength λ of the light, and the formula ( 4)
As shown in , if the R of the liquid crystal cell is compensated by the R of the retardation plate and T=constant in all wavelength ranges of visible light, the background color will be completely white and the display quality will be good.
位相差板のαの値を1.0O11,08,1,06と変
化させた場合のSTN型液晶表示装置の透過光のスペク
トルを図1〜図8に示した。αの値が大きい程、完全な
白色εζ近い表示となることが分る。The spectra of transmitted light of the STN liquid crystal display device when the value of α of the retardation plate was changed to 1.0O11,08,1,06 are shown in FIGS. 1 to 8. It can be seen that the larger the value of α, the closer the display becomes to perfect white εζ.
以上の説明で明らかなように液晶表示体に用いる位相差
板のα値は1.00より大きい方が表示品質が良好にな
り、好ましくは1.08以上であることが望まれる。α
値が好ましい範囲である1、08以上を示す熱可塑性高
分子としては、該高分子の主な繰返し単位中に芳香族環
を含む高分子化合物あるいはハロゲン原子やニトリル基
などの極性基を有する高分子化合物を例示することがで
きる。これらの高分子化合物としては、芳香族環を有す
るポリスチレン類、ポリエーテルサルフォノ類、ポリエ
ーテルエーテルケトン類、ボリアリレート類、ポリエス
テル類、ポリスチレン類、ポリカーボネート類等の高分
子化合物及びアクリロニトリル重合体、三フッ化−塩化
エチレン重合体等のフッ素系樹脂、?り塩化ビニル等を
例示することができる。また、これらの高分子化合物の
変性物や混合物も必要に応じて適宜用いることができる
。さらには、単独ではα値が1.03以下の熱可塑性樹
脂であってもα値が大きい低分子液晶あるいは高分子液
晶等とのブレンドによって目的とする本発明の位相差板
を得ることもできる。As is clear from the above description, the display quality will be better if the α value of the retardation plate used in the liquid crystal display is larger than 1.00, and preferably 1.08 or more. α
Thermoplastic polymers exhibiting a value of 1.08 or more, which is a preferable range, include polymer compounds containing an aromatic ring in the main repeating unit of the polymer, or polymers having polar groups such as halogen atoms and nitrile groups. Examples include molecular compounds. These polymer compounds include polymer compounds having aromatic rings such as polystyrenes, polyether sulfonos, polyether ether ketones, polyarylates, polyesters, polystyrenes, polycarbonates, and acrylonitrile polymers. Fluorine resins such as trifluoride-ethylene chloride polymer? Examples include vinyl chloride. Furthermore, modified products or mixtures of these polymer compounds can also be used as appropriate. Furthermore, even if the thermoplastic resin alone has an α value of 1.03 or less, the desired retardation plate of the present invention can be obtained by blending it with a low-molecular liquid crystal or polymer liquid crystal having a large α value. .
前記した熱可塑性高分子化合物を位相差板とする方法に
ついて次に記す。本発明の位相差板は前記熱可塑性高分
子を公知の製膜方法、すなわち、溶剤キャスト法、カレ
ンダー加工法、または押出加工法で原反フィルムまたは
シートに成形した後−軸方向に適度に延伸することによ
って製造される。A method of using the above-mentioned thermoplastic polymer compound as a retardation plate will be described below. The retardation plate of the present invention is produced by forming the thermoplastic polymer into a raw film or sheet using a known film forming method, that is, a solvent casting method, a calendaring method, or an extrusion method, and then stretching the thermoplastic polymer appropriately in the axial direction. Manufactured by
光学軸が一定で、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 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. Heat treatment is an effective method for reducing micro-orientation before stretching.
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以上の温度で熱処理を実施す
る。In order to produce the retardation plate of the present invention, heat treatment is performed at a temperature equal to or higher than the heating deformation temperature of the film or sheet before stretching.
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0となり、はぼ完全な無配向フィルム又
はシートとなる。When the heat treatment is performed, the birefringence of the original film or sheet becomes substantially 0, resulting in a nearly 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−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 obtained in this way in the uniaxial direction include a transverse-axial stretching method using a tenter method, an inter-roll compression stretching method, and a longitudinal-axial stretching method using rolls with different peripheral speeds. A known uniaxial stretching method can be employed.
本発明において光学的に色ムラが小さく、レターデージ
暫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(toox(A−B)/A)を1096
以下、好ましくは5%以下、さらに好ましくは実質的に
O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。In the present invention, in order to obtain a retardation plate with optically small color unevenness and small fluctuation in retardage, the neck-in rate (defined from the film width A before stretching and the film width B after stretching) ( toox(A-B)/A) to 1096
Below, it is necessary to suppress O to preferably 5% or less, and more preferably to substantially O. 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.
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、フィルム又はシートの複屈折率を実質的にO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、用い
る熱可塑性樹脂の種類、厚み、必要なレターデーシロン
値等によって、加工条件をかえる必要がある。Transverse uniaxial stretching by the tenter method generally includes three steps: a preheating step, a stretching step, and a heat treatment step. The preheating step is useful because it has the same role as the heat treatment step to make the birefringence of the film or sheet substantially O. The stretching process is the most important process for producing a retardation plate, and processing conditions must be changed depending on the type and thickness of the thermoplastic resin used, the required retardation value, etc.
延伸後の熱処理工程は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ランの均一性
向上のためには、有用な工程となる。The heat treatment step after stretching is a useful step for improving the dimensional stability of the obtained stretched film or sheet and for improving the uniformity of the retard silane.
本発明において、400〜7 Q Q nmの可視光線
波長域における平均の透過率は以下のように定義する。In the present invention, the average transmittance in the visible light wavelength range of 400 to 7 Q Q nm is defined as follows.
すなわち分光光度計又は分光計等によ1)400〜70
0 nmの範囲において10nm毎の透過率を測定し、
得られた31点の透過率を平均した値である。本位相差
板は、光学的な用途に用いるため、平均の光線透過率は
、できるだけ大きいことが好ましく、通常50%以上、
好ましくは80%以上は必要である。That is, 1) 400 to 70 using a spectrophotometer or spectrometer, etc.
Measure the transmittance every 10 nm in the range of 0 nm,
This is the average value of the transmittances of the 31 points obtained. Since this retardation plate is used for optical purposes, the average light transmittance is preferably as high as possible, usually 50% or more,
Preferably 80% or more is required.
本発明でいう光学的な色ムラは、以下に定義される△E
*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 defined below as △E
*Can be displayed quantitatively.
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*、b*(DfiをJI
S−Z−8729(L*u*v*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*
b*から以下の式により(△E*)i、jを計算する。In other words, L*, a*, b* (Dfi is JI
Measurement is performed using a spectrophotometer or spectrometer according to S-Z-8729 (Method for displaying object color using L*u*v* color system). The above L* a* for samples at n different locations
(ΔE*)i, j are calculated from b* using the following formula.
(△E*)i、j
=(((ΔL*)i、j)2+((Δa*)i、j)2
+((△b*)i、j))1/。(△E*)i, j = (((ΔL*)i, j)2+((Δa*)i, j)2
+((△b*)i,j))1/.
ただし
く△L*)i 、j=(L*)i−(L*)j(△a*
)i、j=(a*)i −(a*)j(Δb*)i 、
j=(b*)i−(b*)j1 = 1.〜n
j=r〜n
i〆j
この(ΔE*)i jのなかで最大の値を△E*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点のサンプルをとって測
定し、上式により計算する。この△E*が小さい方が光
学的色ムラが少なくなるのでできるだけ小さい方が好ま
しい。Just △L*)i, j=(L*)i−(L*)j(△a*
)i, j=(a*)i −(a*)j(Δb*)i,
j=(b*)i-(b*)j1=1. ~n j = r ~ n i〆j The maximum value among these (ΔE*) i j is assumed to be ΔE*. It is preferable that the number of measurements n is large, but usually: 30cm
Ten samples are taken at random from the corner samples, measured, and calculated using the above formula. The smaller ΔE* is, the less optical color unevenness will occur, so it is preferable that it be as small as possible.
本発明の位相差板にあってはΔE*の値は80以下、好
ましくは20以下にする必要がある。In the retardation plate of the present invention, the value of ΔE* needs to be 80 or less, preferably 20 or less.
このようにして得られた位相差板は複合偏光板、液晶表
示装置の他光学フィルター等新規用途に適用することが
できる。The retardation plate thus obtained can be applied to new uses such as composite polarizing plates, liquid crystal display devices, and optical filters.
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
ことができる。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仁とが出来る。なかでも、
ポリビニルアルコールフィルムに、ヨウ素や二色性染料
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、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. It is possible to use a similar type of polarizing plate. Among them,
A polyvinyl alcohol film that adsorbs iodine or dichroic dye and is laminated on both sides of a polarizer oriented on the -axis with a cellulose-based film such as cellulose triacetate as a protective film has excellent polarization characteristics and hue characteristics. Preferable from above.
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軸と位相差板の光学
軸を15〜75度、好ましくは80〜60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 axis of the polarizing plate and the optical axis of the retardation plate are set at 15 to 75 degrees, preferably 80 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. .
本発明の位相差板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
配置することによって、本発明の液晶表示装置を得′る
。この時、位相差板と偏光板は、その光学軸が80〜6
0度、好ましくは40〜60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、その光学軸を直交、もしくは直交に近い状態
、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 of the present invention, the twist angle of the liquid crystal molecules is 90 degrees or more,
Specifically, the liquid crystal display device of the present invention is obtained by placing a pair of polarizing plates on one side of a liquid crystal cell at an angle of about 180 to 270 degrees and sandwiching them. At this time, the optical axis of the retardation plate and polarizing plate is 80 to 6
Good display quality can be achieved by bonding them at an angle of 0 degrees, preferably in the range of 40 to 60 degrees. Good display quality can be achieved by arranging the pair of polarizing plates so that their optical axes are perpendicular or nearly perpendicular, or parallel or nearly parallel.
[発明の効果]
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、光学的性能が良好であると同時に80℃および60
”0X90%RH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
置に用いれば高信頼性で、かつ高品質な白黒表示を有す
る本発明の液晶表示装置が得られる。その他、各皿の光
学フィルター等に適用することも可能である。[Effect of the invention] The retardation plate or composite polarizing plate obtained in this way has good optical performance and can be heated to 80°C and 60°C.
"These products can pass the accelerated durability test at 0x90% RH. Therefore, the twist angle of liquid crystal molecules is 90%.
If the liquid crystal display device is used in a liquid crystal display device having a temperature of 180° to 270° or more, the liquid crystal display device of the present invention is highly reliable and has a high quality black and white display. In addition, it is also possible to apply it to optical filters for each dish.
[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、偏光類Wi鏡に備え
つけたセナルモンコンペンセーター(546nm)を使
用し、光源にはハロゲンランプを用いた。△E*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 to these. In the measurement of the retardation value of the retardation plate in the examples, a Senarmont compensator (546 nm) attached to a polarizer Wi mirror was used, and a halogen lamp was used as the light source. ΔE* was measured and calculated using a spectrophotometer according to the method described above.
なお、式(1)で定義される位相差板のαの値は、アツ
ベ屈折計を用いて、以下の(I)〜(5)の手順により
求めた。Note that the value of α of the retardation plate defined by formula (1) was determined by the following procedures (I) to (5) using an Atsube refractometer.
(L) ナトリウムのD線(589,8nm)を用1
.N”ic、光学軸方向の屈折率nDIおよびそれと直
交する方向の屈折率nD2を測定し、以下の式(2)に
より、589.8nmで測定したレターデージ。(L) Using sodium D line (589,8 nm) 1
.. N"ic, the refractive index nDI in the optical axis direction and the refractive index nD2 in the direction orthogonal thereto are measured, and the retardage is measured at 589.8 nm using the following equation (2).
ン値RDを計算する。Calculate the value RD.
R”” I nDI ”D21 X d・・・・・・
・・・・・−・・・・・(2)d:位相差板の厚み(n
m )
(社) ナトリウムのFil(486,1nm)を用い
て光学主軸方向のみかけの屈折率nF1 、およびそれ
を直交する方向のみかけの屈折率np!を測定し、以下
の式(3) 、 (4)により実際の屈折率NFI 、
NF2を計算する。R"" I nDI "D21 X d...
・・・・・・−・・・・・・(2) d: Thickness of retardation plate (n
m) Co., Ltd. Using sodium Fil (486, 1 nm), the apparent refractive index nF1 in the optical principal axis direction and the apparent refractive index np in the direction orthogonal to it! The actual refractive index NFI is determined by the following equations (3) and (4).
Calculate NF2.
Np2=PXsin[68°L−sin−’ (”Ax
5in(68°−5in−’(り))]”−(4)P
L、74
ただし、Pは486.1nmでの屈折計主プリズムの屈
折率であり以下の式(5)により計算した値を用いた。Np2=PXsin[68°L-sin-'("Ax
5in(68°-5in-'(ri))]"-(4)P
L, 74 However, P is the refractive index of the main prism of the refractometer at 486.1 nm, and the value calculated using the following equation (5) was used.
= 1.7589 ・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・(5)
(I[D NFI 、 Npg (7)値を用いて、
以下の式(6)により、486.1 nrnで測定した
レターデーション値RFを計算する。= 1.7589 ・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・(5)
(I[D NFI , Npg (7) Using the value,
The retardation value RF measured at 486.1 nrn is calculated using the following equation (6).
RP= l Npt−Npg l X d・・・・・・
・・・・・・・・・・・・・・・・・・(6)d:位相
差板の厚み(nm)
([v)Rp、RoO値を用いて、式(1)によりαの
値を計算する。RP= l Npt-Npg l X d...
・・・・・・・・・・・・・・・・・・(6) d: Thickness of retardation plate (nm) ([v) Using Rp and RoO values, α is calculated by equation (1). Calculate the value.
又、実施例における直線偏光板は、例えば特開昭61−
20008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
酸セルロー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島る。In addition, the linear polarizing plate in the embodiment is, for example, disclosed in Japanese Patent Application Laid-Open No. 1986-
It is produced by the method described in Japanese Patent No. 20008, in which iodine is 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
厚さ800 ttm 、幅800mのポリカーボネート
フィルム(分子1約26,000)を190”C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200μm1幅45
0■の延伸フィルムを得た。該延伸フィルムは光線有し
、光学的色ムラのほとんどない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を用いて、偏光板の
片一方の面に光学軸が約45度になるように貼り付けて
本発明の複合偏光板を得た。さらにこの位相差板を液晶
分子のねじれ角が約200度であり、液晶の△nXci
が約35 Q nm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となり、虹模様
等の色ムラはな(、良好な表示品質を有する本発明の液
晶表示装置を得た。Example 1 A polycarbonate film (approximately 26,000 molecules per molecule) with a thickness of 800 ttm and a width of 800 m was preheated at a temperature of 190"C, and then horizontally uniaxially stretched by a tenter method at a temperature of 175"C to a thickness of approximately 200μm 1 width 45
A stretched film of 0 cm was obtained. The stretched film had light rays, and a retardation plate of the present invention with almost no optical color unevenness was obtained. This retardation plate was attached to one surface of a polarizing plate using an acrylic adhesive so that the optical axis was set at about 45 degrees to obtain a composite polarizing plate of the present invention. Furthermore, the twist angle of the liquid crystal molecules is approximately 200 degrees, and the △nXci of the liquid crystal is
When used by bonding via an adhesive between the liquid crystal cell of a liquid crystal display device with a wavelength of about 35 Q nm and the upper polarizing plate,
The liquid crystal display device of the present invention was obtained, which had a substantially monochrome display with a white background and a black display area, and had good display quality without any color unevenness such as a rainbow pattern.
実施例2
厚さ400μm%@800 mのポリエステル共重合体
フィルム(PETG6768、イーストマンケミカル社
)をtab”cの温度であらかじめ予熱したあと、12
0’Cの温度でテンター法による横一軸延伸をおこない
、厚さ約250μm1幅480■の延伸フィルムを得た
。該延伸フィルムは光線透過率が約89%、α値が約1
.06、R値が585nm、△E*は11.0で均一な
品質を有し、光学的色ムラのほとんどない本発明の位相
差板を得た。実施例1と同様にして液晶表示装置に適用
したところ実施例1と同様、良好な表示品質を有する本
発明の液晶表示装置を得た。Example 2 A polyester copolymer film (PETG6768, Eastman Chemical Company) with a thickness of 400 μm% @ 800 m was preheated at a temperature of tab"c, and then
Transverse uniaxial stretching was carried out using a tenter method at a temperature of 0'C to obtain a stretched film with a thickness of about 250 μm and a width of 480 cm. The stretched film has a light transmittance of about 89% and an α value of about 1.
.. 06, a retardation plate of the present invention having an R value of 585 nm, ΔE* of 11.0, uniform quality, and almost no optical color unevenness was obtained. When applied to a liquid crystal display device in the same manner as in Example 1, a liquid crystal display device of the present invention having good display quality was obtained as in Example 1.
実施例8
予熱したあと、100”Cの温度でテンター法による横
一軸延伸をおこない、厚さ約140μm1幅540mの
延伸フィルムを得た。該8.0で均一な品質を有し、光
学的色ムラのほとんどない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を用いて偏光板の片一方
の面に光学軸が約45度になるように貼りつけて、本発
明の複合偏光板を得た。さら罠この位相差板を、液晶分
子のねじれ角が約180度であり、液晶のΔnXdが約
950nm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となり、虹模様等の色ム
ラはなく、良好な表示品質を有する本発明の液晶表示装
置を得た。Example 8 After preheating, transverse uniaxial stretching was carried out using a tenter method at a temperature of 100"C to obtain a stretched film with a thickness of about 140 μm and a width of 540 m. It had a uniform quality of 8.0 and an optical color. A retardation plate of the present invention with almost no unevenness was obtained. This retardation plate was attached to one side of a polarizing plate using an acrylic adhesive so that the optical axis was approximately 45 degrees. A composite polarizing plate was obtained.This retardation plate was used by applying an adhesive between the liquid crystal cell and the upper polarizing plate of a liquid crystal display device in which the twist angle of the liquid crystal molecules is approximately 180 degrees and the ΔnXd of the liquid crystal is approximately 950 nm. When the liquid crystal display device of the present invention was laminated with the liquid crystal display device used, the background color was white and the display area was black, resulting in an almost black and white display, and there was no color unevenness such as a rainbow pattern, and the liquid crystal display device of the present invention had good display quality.
実施例4
厚さ150Iims幅800mのポリサルホンフィルム
(スミライトFS−1200.住友ベークライト製)を
280℃の温度であらかじめ予熱したあと、21G”C
の温度でテンター法による横一軸延伸をおこない厚さ約
75μm1幅600−の延伸フィルムを得た。該9.5
で均一な賞品を有し、光学的色ムラのほとんどない、本
発明の位相差板を得た。実施例1と同様にして、液晶表
示装置に適用したところ、実施例1と同様、良好な表示
品質を有する本発明の液晶表示装置を得た。Example 4 A polysulfone film (Sumilite FS-1200, manufactured by Sumitomo Bakelite) with a thickness of 150 Imms and a width of 800 m was preheated at a temperature of 280°C, and then heated to 21G”C.
Transverse uniaxial stretching was carried out using a tenter method at a temperature of about 75 μm in thickness and 600 μm in width to obtain a stretched film. 9.5
A retardation plate of the present invention was obtained which had a uniform quality and almost no optical color unevenness. When applied to a liquid crystal display device in the same manner as in Example 1, a liquid crystal display device of the present invention having good display quality was obtained as in Example 1.
実施例5
厚さ200μm1幅800−のポリエチレンテレフタレ
ートフィルムを210℃の温度であらかじめ予熱したあ
と195”Cの温度でテンター法による横一軸延伸をお
こない厚さ約140μm1幅480■の延伸フィルムを
ΔE*は12.8で均一な品質を有し、光学的色ムラの
ほとんどない本発明の位相差板を得た。この位相差板を
アクリル系粘着剤を用いて偏光板の片一方の面に光学軸
が約45度になるように貼りつけて本発明の複合偏光板
を得た。Example 5 A polyethylene terephthalate film with a thickness of 200 μm and a width of 800 μm was preheated at a temperature of 210° C., and then horizontally uniaxially stretched using a tenter method at a temperature of 195”C to obtain a stretched film with a thickness of about 140 μm and a width of 480 cm with ΔE* The retardation plate of the present invention has a uniform quality of 12.8 and almost no optical color unevenness.This retardation plate is optically attached to one side of a polarizing plate using an acrylic adhesive. The composite polarizing plate of the present invention was obtained by pasting the plates so that their axes were at about 45 degrees.
さらに、この位相差板を液晶分子のねじれ角が約220
度であり、液晶の△nxdが約800 nm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
白黒表示となり虹模様等の色ムラはなく良好な表示品質
を有する液晶表示装置を得た。Furthermore, the twist angle of the liquid crystal molecules in this retardation plate is approximately 220.
When used by pasting an adhesive between the liquid crystal cell and the upper polarizing plate of a liquid crystal display device in which the Δnxd of the liquid crystal is approximately 800 nm, the background color is white and the display area is black, almost black and white. A liquid crystal display device with good display quality without color unevenness such as a rainbow pattern was obtained.
比較例に
酢酸セルロースからなる厚さ約400μmの位相差板(
α値は約0.96、R値は約525nm)を実施例1と
同様にして、液晶表示装置に適用したところ、実施例1
と比較して、コントラストの劣る液晶表示装置しか得ら
れなかった。As a comparative example, a retardation plate with a thickness of about 400 μm made of cellulose acetate (
When the α value was approximately 0.96 and the R value was approximately 525 nm) was applied to a liquid crystal display device in the same manner as in Example 1, Example 1
Compared to this, only a liquid crystal display device with inferior contrast could be obtained.
比較例2
ポリプロピレンからなる厚さ約20μmの位相差板(α
値は約0.99、R値は約610nm)を実施例1と同
様にして、液晶表示装置に適用したところ、実施例1と
比較して、コントラストの劣る液晶表示装置しか得られ
なかった。Comparative Example 2 Retardation plate (α
When applied to a liquid crystal display device in the same manner as in Example 1 (the R value was approximately 0.99 and the R value was approximately 610 nm), a liquid crystal display device with inferior contrast compared to Example 1 was obtained.
実施例6
ポリ塩化ビニル75wt%と以下の式(7)に示す高分
子液晶化合物25 wt%を150℃でブレンドしたあ
と約200μmのフィルムに成形した。ロール温度10
0℃、線圧200 kQ/lynの条件で一対のロール
間で圧縮延伸をおこない、厚さ約100μの延伸フィル
ムを得た。Example 6 75 wt % of polyvinyl chloride and 25 wt % of a polymeric liquid crystal compound represented by the following formula (7) were blended at 150° C. and then formed into a film of about 200 μm. Roll temperature 10
Compression stretching was performed between a pair of rolls at 0° C. and a linear pressure of 200 kQ/lyn to obtain a stretched film with a thickness of about 100 μm.
(ネックイン率2%)該延伸フィルムは光線透過率が約
87%、α値が約1.06、R値は約240nm、△E
*は17.8であり、光学的色ムラの少ない本発明の位
相差板を得た。(Neck-in rate 2%) The stretched film has a light transmittance of about 87%, an α value of about 1.06, an R value of about 240 nm, and a ΔE
* was 17.8, and the retardation plate of the present invention with little optical color unevenness was obtained.
実施例7
ポリカーボネート(分子量約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80対20に均一
にブレンドした組成からなる厚さ200μm1幅800
mの透明フィルムを、180℃の温度でweptガ予熱
したあと、155”Cの温度でテンター法による横一軸
延伸をおこない、厚さ約185μm1幅515wgの延
伸フィルムを得た。該延伸フィルムはα値が約1.05
、R値は約460nm、△、A*は8.8であり、均一
な品質を有し、光学的色ムラのほとんどない本発明の位
相差板を得た。この位相差板をアクリル系粘着剤を用い
て偏光板と互いの光学軸が約45度になるように貼りつ
けて、本発明の複合偏光板を得た。実施例1と同様にし
て液晶表示装置に適用したところ実施例1と同様、良好
な表示品質を有する本発明の液晶表示装置を得た。Example 7 Consisting of a uniform blend of polycarbonate (molecular weight approximately 16,000) and styrene/maleic anhydride copolymer (styrene/maleic anhydride (weight ratio) = 92/8) at a weight ratio of 80:20. Thickness 200μm 1 width 800
After preheating the transparent film at a temperature of 180° C., transverse uniaxial stretching was performed using a tenter method at a temperature of 155”C to obtain a stretched film with a thickness of approximately 185 μm and a width of 515 wg. The value is approximately 1.05
, R value was about 460 nm, Δ, A* was 8.8, and the retardation plate of the present invention was obtained which had uniform quality and almost no optical color unevenness. This retardation plate was attached to a polarizing plate using an acrylic adhesive so that their optical axes were at about 45 degrees to obtain a composite polarizing plate of the present invention. When applied to a liquid crystal display device in the same manner as in Example 1, a liquid crystal display device of the present invention having good display quality was obtained as in Example 1.
実施例8
厚さ約220 nm%巾800mのポリメチルメタアク
リレートフィルム(住友化学工業■−
■製 スミペックス MMOの押出フィルム)を約9
0°Cにて予熱した後、80”Cにてテンター法による
横一軸延伸を行い厚さ約150μm1巾約440mの延
伸フィルムを得た。Example 8 A polymethyl methacrylate film (extruded film of Sumipex MMO manufactured by Sumitomo Chemical ■- ■) with a thickness of approximately 220 nm% and a width of 800 m was
After preheating at 0°C, transverse uniaxial stretching was performed at 80''C using a tenter method to obtain a stretched film with a thickness of about 150 μm and a width of about 440 m.
この延伸フィルムは、R値が約5701m%△E*値は
7.2、光線透過率が約9096、及びα値が約1.0
1で、均一な品質を示し、光学的色ムラが殆んどない良
好な位相差板を得た。This stretched film has an R value of approximately 5701 m%, an E* value of 7.2, a light transmittance of approximately 9096, and an α value of approximately 1.0.
In Example No. 1, a good retardation plate was obtained which exhibited uniform quality and almost no optical color unevenness.
実施例9
厚さ60μmの低密度ポリエチレン(住友化学工業■製
スミカセン■F208−1 )フィルムをロール温度
100℃、線圧250bJ/cmの条件にて一対のロー
ル間での圧縮延伸を行い、厚さ15μm1ネツクイン率
3%の延伸フィルムを得た。Example 9 A 60 μm thick low density polyethylene (Sumikasen F208-1 manufactured by Sumitomo Chemical) film was compressed and stretched between a pair of rolls at a roll temperature of 100°C and a linear pressure of 250 bJ/cm. A stretched film with a diameter of 15 μm and a neck-in rate of 3% was obtained.
得られた延伸フィルムはR値は約680 nm、ΔE*
値は14.4、光線透過率は約86%、及びα値は約1
.OOで均一な品質を示し、光学的色ムラが殆んどない
良好な位相差板を得た。The resulting stretched film has an R value of approximately 680 nm and a ΔE*
The value is 14.4, the light transmittance is about 86%, and the α value is about 1.
.. A good retardation plate was obtained which exhibited uniform quality in OO and almost no optical color unevenness.
実施例10
実施例4と同じ原料ポリサルフォンフィルムを用いて、
215°Cにて予熱した後、周速度の異なるロール間で
縦−軸に引張延伸を行い、厚さ約70μm、ネックイン
率6%の延伸フィルムを得た。Example 10 Using the same raw material polysulfone film as in Example 4,
After preheating at 215[deg.] C., the film was stretched longitudinally and longitudinally between rolls having different circumferential speeds to obtain a stretched film with a thickness of about 70 [mu]m and a neck-in rate of 6%.
この延伸フィルムは光線透過率は約88%、R値は約6
60nm、△E*は16.0で均一な品質を示し、光学
的色ムラの殆んどない良好な位相差板を得た。This stretched film has a light transmittance of about 88% and an R value of about 6.
A good retardation plate with a wavelength of 60 nm and ΔE* of 16.0, showing uniform quality and almost no optical color unevenness, was obtained.
実施例11゜
実施例γ〜10で得られた位相差板を液晶分子のねじれ
角が約200であり、液晶分子の△nXdが約850
nm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を示し、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。なかでも
α値が1.03以上を示す位相差板を用いた場合によい
優れた表示品質が得られた。Example 11゜The retardation plate obtained in Examples γ to 10 was prepared so that the twist angle of the liquid crystal molecules was about 200 and the △nXd of the liquid crystal molecules was about 850.
When used by bonding between the liquid crystal cell and the upper polarizing plate of a liquid crystal display device using an adhesive, the display showed an almost monochrome display with a white background and a black display area, with no rainbow-like color unevenness. (
A liquid crystal display device with good display quality was obtained. Among them, excellent display quality was obtained when a retardation plate having an α value of 1.03 or more was used.
比較例8
実施例10において、縦−軸延伸装置のロール間の距離
を長くして延伸をおこない、厚さ約80μmの延伸フィ
ルムを得た。(ネックイン率80%)該延伸フィルムは
、光線透過率が約88%、R値が約720nmであつた
が、ΔE*は82.4であり、光学的色ムラの大きい位
相差板しか得られなかった。該位相差板を実施例11と
同じ液晶表示装置に適用したところ、虹模様等の色ムラ
が大きく、表示品質はむしろ低下した。Comparative Example 8 In Example 10, stretching was carried out by increasing the distance between the rolls of the longitudinal-axial stretching device to obtain a stretched film with a thickness of about 80 μm. (Neck-in rate: 80%) The stretched film had a light transmittance of about 88% and an R value of about 720 nm, but ΔE* was 82.4, and only a retardation plate with large optical color unevenness was obtained. I couldn't. When this retardation plate was applied to the same liquid crystal display device as in Example 11, color unevenness such as a rainbow pattern was large, and the display quality was rather deteriorated.
比較例4
厚す250μのポリエステル共重合体フィルム(実施例
2に同じ)を用いて、比較例8と同じ延伸装置で、11
0°Cで一軸延伸をおこない、170μの延伸フィルム
を得た。Comparative Example 4 A polyester copolymer film with a thickness of 250μ (same as in Example 2) was used, and with the same stretching device as in Comparative Example 8, 11
Uniaxial stretching was performed at 0°C to obtain a stretched film of 170μ.
(ネックイン率40%)、該延伸フィルムは光線透過率
が約89%、R値が約490nmであったが、△E*は
84.5であり光学的色ムラの大きい位相差板しか得ら
れなかった。(neck-in rate: 40%), the stretched film had a light transmittance of about 89% and an R value of about 490 nm, but ΔE* was 84.5, and only a retardation plate with large optical color unevenness was obtained. I couldn't.
該位相差板を実施例11と同じ液晶表示装置に適用した
ところ、虹模様等の色ムラが大きく、表示品質はむしろ
低下した。When this retardation plate was applied to the same liquid crystal display device as in Example 11, color unevenness such as a rainbow pattern was large, and the display quality was rather deteriorated.
実施例12
実施例1と同じポリカーボネートフィルムを185℃の
温度であらかじめ予熱したあと17δ℃の温度でテンタ
ー法による横一軸延伸をおこない、厚さ約160μ、幅
56〇−の延伸フィルムを得た。該延伸フィルムは光線
透過率が約91%、α値が約1.06、R漬方
が約885nm、△A*は9.8で均一な品質を有し、
光学的色ムラのほとんどない本発明の位相差板を得た。Example 12 The same polycarbonate film as in Example 1 was preheated at a temperature of 185°C, and then horizontally uniaxially stretched at a temperature of 17δ°C by a tenter method to obtain a stretched film with a thickness of about 160 μm and a width of 560 mm. The stretched film has uniform quality with a light transmittance of about 91%, an α value of about 1.06, an R dip of about 885 nm, and a ΔA* of 9.8.
A retardation plate of the present invention with almost no optical color unevenness was obtained.
実施例6と同様にして、液晶表示装置に適用したところ
、背景色が白、表示部が黒のほぼ白黒表示となり、虹模
様等の色ムラはなく良好な表示品質を有する液晶表示装
置を得た。When applied to a liquid crystal display device in the same manner as in Example 6, an almost monochrome display with a white background and a black display area was obtained, and a liquid crystal display device with good display quality without color unevenness such as a rainbow pattern was obtained. Ta.
実施例13
厚さ200 /(rn 1N800 wmのポリカーボ
ネートフィルム(分子量的26,000)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おこなったあと、180“C
で2分間熱処理をおこなった。該延伸フィルムは光線透
過率が約91%、α値が約1.06、R値が約60nm
、△E*は18.1で均一な品質を有し、光学的色ムラ
のほとんどない本発明の位相差板を得た。Example 13 A polycarbonate film (molecular weight 26,000) with a thickness of 200/(rn 1N800 wm) was preheated at a temperature of 190°C, and then transversely uniaxially stretched by a tenter method at a temperature of 175°C. C
Heat treatment was performed for 2 minutes. The stretched film has a light transmittance of about 91%, an α value of about 1.06, and an R value of about 60 nm.
, ΔE* was 18.1, the retardation plate of the present invention had uniform quality and almost no optical color unevenness.
液晶のねじれ角が約200度であり、液晶の△nXdの
値が約850nmである液晶セルの両側に1対の偏光板
を平行ニコル状態で配置し、上偏光板と液晶セルの間に
R値が約650 nmの位相差板を配置した構成からな
るSTN型液晶表示装置において、位相差板のα値を1
.00(笛1図)、1.08(第2図)、1.06(第
8図)と変化させたときの透過光スペクトル(背景色)
を示す。
λ(nm)
第1図
ノ、(nm)
第2図
λ(nm)
第3図The twist angle of the liquid crystal is about 200 degrees, and the value of △nXd of the liquid crystal is about 850 nm.A pair of polarizing plates are arranged in a parallel Nicol state on both sides of the liquid crystal cell, and an R is placed between the upper polarizing plate and the liquid crystal cell. In an STN liquid crystal display device configured with a retardation plate with a value of about 650 nm, the α value of the retardation plate is set to 1.
.. Transmitted light spectrum (background color) when changed to 00 (Fig. 1), 1.08 (Fig. 2), and 1.06 (Fig. 8)
shows. λ (nm) Figure 1 (nm) Figure 2 λ (nm) Figure 3
Claims (5)
伸して形成されるフィルムまたはシートであって、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80〜1200nmの範
囲にあり、かつ、該フィルムまたはシートを直交ニコル
下にその光学主軸が45度になるように配置して測定し
たときの色差(ΔE^*)が80以下であることを特徴
とする位相差板。(1) A film or sheet formed by uniaxially stretching a thermoplastic polymer film or sheet, which has retardation (Δn×d) defined as the product of birefringence (Δn) and thickness (d). is in the range of 80 to 1200 nm, and the color difference (ΔE^*) is 80 or less when the film or sheet is placed under crossed Nicols with its optical principal axis at 45 degrees. A retardation plate characterized by:
ン率が10%以下となるように一軸方向に延伸して形成
される高分子フィルム又はシートであって、複屈折率(
△n)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200〜1000nmの範囲に
あり、かつ、該フィルムまたはシートを直交ニコル下に
その光学主軸が45度になるように配置して測定したと
きの色差(△E^*)が20以下であることを特徴とす
る位相差板。(2) A polymer film or sheet formed by stretching a thermoplastic polymer film or sheet in the uniaxial direction so that the neck-in rate is 10% or less, and which has a birefringence (
The measured value of retardation (Δn x d) defined as the product of Δn) and thickness (d) is in the range of 200 to 1000 nm, and the optical principal axis of the film or sheet is placed under crossed Nicols at 45 degrees. A retardation plate having a color difference (△E^*) of 20 or less when measured by arranging it so that
る特許請求の範囲第1項記載の位相差板。 α=(R_F)/(R_D)…………………(1)ここ
でR_F:ナトリウムF線(486.1nm)で測定し
たレターデーション 値。 R_D:ナトリウムD線(589.8nm)で測定した
レターデーション 値。(3) The retardation plate according to claim 1, wherein the α value defined by formula (1) is 1.00 or more. α=(R_F)/(R_D)…………(1) where R_F: retardation value measured with sodium F line (486.1 nm). R_D: Retardation value measured with sodium D line (589.8 nm).
積層してなる複合偏光板。(4) A composite polarizing plate obtained by laminating the retardation plate according to claim 1 on a polarizing plate.
の片側の面に積層し、それを挾むようにして一対の偏光
板を積層してなる液晶表示装置。(5) A liquid crystal display device in which the retardation plate according to claim 1 is laminated on one side of a liquid crystal cell, and a pair of polarizing plates are laminated to sandwich the retardation plate.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63162114A JPH0713683B2 (en) | 1987-06-30 | 1988-06-28 | Retardation plate, composite polarizing plate using the same, and liquid crystal display device |
DE19883884291 DE3884291T2 (en) | 1987-06-30 | 1988-06-29 | Phase-retarding polymer films and polarizing components. |
CA000570770A CA1312759C (en) | 1987-06-30 | 1988-06-29 | Phase retarder and liquid crystal display using the same |
EP88305892A EP0297841B1 (en) | 1987-06-30 | 1988-06-29 | Polymeric films effective as optical phase retarders and polarising assemblies |
US07/642,554 US5061042A (en) | 1987-02-02 | 1991-01-18 | Phase retarder and liquid crystal display using the same |
SG165094A SG165094G (en) | 1987-06-30 | 1994-11-15 | Polymeric films effective as optical phase retarders and polarising assemblies |
HK16295A HK16295A (en) | 1987-06-30 | 1995-02-06 | Polymeric films effective as optical phase retarders and polarising assemblies |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16480187 | 1987-06-30 | ||
JP62-164801 | 1987-06-30 | ||
JP62-182849 | 1987-07-21 | ||
JP62-241979 | 1987-09-24 | ||
JP63-89478 | 1988-04-11 | ||
JP63162114A JPH0713683B2 (en) | 1987-06-30 | 1988-06-28 | Retardation plate, composite polarizing plate using the same, and liquid crystal display device |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7309038A Division JP2887388B2 (en) | 1995-11-28 | 1995-11-28 | Retardation plate, composite polarizing plate and liquid crystal display device using the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0242406A true JPH0242406A (en) | 1990-02-13 |
JPH0713683B2 JPH0713683B2 (en) | 1995-02-15 |
Family
ID=26488018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63162114A Expired - Lifetime JPH0713683B2 (en) | 1987-02-02 | 1988-06-28 | Retardation plate, composite polarizing plate using the same, and liquid crystal display device |
Country Status (1)
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JP (1) | JPH0713683B2 (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02189518A (en) * | 1989-01-19 | 1990-07-25 | Seiko Epson Corp | Liquid crystal electrooptic element |
JPH04365002A (en) * | 1991-06-12 | 1992-12-17 | Sekisui Chem Co Ltd | Phase difference compensating plate |
WO1992022836A1 (en) * | 1991-06-17 | 1992-12-23 | Seiko Epson Corporation | Phase difference plate and liquid crystal display |
WO1992022835A1 (en) * | 1991-06-17 | 1992-12-23 | Seiko Epson Corporation | Phase difference elemental film, phase difference plate and liquid crystal display |
WO1992022837A1 (en) * | 1991-06-17 | 1992-12-23 | Seiko Epson Corporation | Phase difference elemental film, phase difference plate and liquid crystal display using same |
JPH05107413A (en) * | 1991-10-16 | 1993-04-30 | Sekisui Chem Co Ltd | Phase difference compensating plate and manufacture thereof |
JPH05241020A (en) * | 1992-02-28 | 1993-09-21 | Idemitsu Petrochem Co Ltd | Phase difference compensation film |
JPH08190094A (en) * | 1994-11-10 | 1996-07-23 | Sumitomo Chem Co Ltd | Optical anisotropic film, its production and liquid crystal display device |
JPH08278406A (en) * | 1995-04-10 | 1996-10-22 | Sumitomo Chem Co Ltd | Optically anisotropic film, its production and liquid crystal display device |
JPH08278410A (en) * | 1995-04-10 | 1996-10-22 | Sumitomo Chem Co Ltd | Optically anisotropic film, its production and liquid crystal display device |
JP2001194527A (en) * | 2000-01-14 | 2001-07-19 | Fuji Photo Film Co Ltd | Norbornene resin composition and phase difference plate |
JP2002022943A (en) * | 2000-07-06 | 2002-01-23 | Fuji Photo Film Co Ltd | Optical compensation sheet, polarizing plate and liquid crystal display device |
JP2002156524A (en) * | 2000-11-20 | 2002-05-31 | Nitto Denko Corp | Circularly polarizing plate, organic el light emitting device and liquid crystal display device |
US6791640B1 (en) | 1997-04-23 | 2004-09-14 | Sharp Kabushiki Kaisha | Reflection liquid crystal display and reflection liquid crystal display provided with built-in touch panel and comprising the same |
US6900865B2 (en) | 1998-03-26 | 2005-05-31 | Sharp Kabushiki Kaisha | Liquid crystal device and display |
WO2008062986A1 (en) | 2006-11-20 | 2008-05-29 | Lg Chem, Ltd. | Optical film and method of manufacturing the same |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6125105A (en) * | 1984-07-13 | 1986-02-04 | Nitto Electric Ind Co Ltd | Reflection type phase difference plate |
JPS61231503A (en) * | 1985-04-05 | 1986-10-15 | Nitto Electric Ind Co Ltd | Polarizing phase plate |
JPS64519A (en) * | 1986-05-19 | 1989-01-05 | Seiko Epson Corp | Liquid crystal display device |
-
1988
- 1988-06-28 JP JP63162114A patent/JPH0713683B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6125105A (en) * | 1984-07-13 | 1986-02-04 | Nitto Electric Ind Co Ltd | Reflection type phase difference plate |
JPS61231503A (en) * | 1985-04-05 | 1986-10-15 | Nitto Electric Ind Co Ltd | Polarizing phase plate |
JPS64519A (en) * | 1986-05-19 | 1989-01-05 | Seiko Epson Corp | Liquid crystal display device |
Cited By (26)
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---|---|---|---|---|
JPH02189518A (en) * | 1989-01-19 | 1990-07-25 | Seiko Epson Corp | Liquid crystal electrooptic element |
JPH04365002A (en) * | 1991-06-12 | 1992-12-17 | Sekisui Chem Co Ltd | Phase difference compensating plate |
WO1992022836A1 (en) * | 1991-06-17 | 1992-12-23 | Seiko Epson Corporation | Phase difference plate and liquid crystal display |
WO1992022835A1 (en) * | 1991-06-17 | 1992-12-23 | Seiko Epson Corporation | Phase difference elemental film, phase difference plate and liquid crystal display |
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US5337174A (en) * | 1991-06-17 | 1994-08-09 | Seiko Epson Corporation | Optical compensator and liquid crystal display |
US5343317A (en) * | 1991-06-17 | 1994-08-30 | Seiko Epson Corporation | Optically compensating film, optical compensator, and liquid crystal display incorporating the same |
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JPH05241020A (en) * | 1992-02-28 | 1993-09-21 | Idemitsu Petrochem Co Ltd | Phase difference compensation film |
JPH08190094A (en) * | 1994-11-10 | 1996-07-23 | Sumitomo Chem Co Ltd | Optical anisotropic film, its production and liquid crystal display device |
JPH08278410A (en) * | 1995-04-10 | 1996-10-22 | Sumitomo Chem Co Ltd | Optically anisotropic film, its production and liquid crystal display device |
JPH08278406A (en) * | 1995-04-10 | 1996-10-22 | Sumitomo Chem Co Ltd | Optically anisotropic film, its production and liquid crystal display device |
US7092052B2 (en) | 1997-04-23 | 2006-08-15 | Sharp Kabushiki Kaisha | Reflective liquid crystal display device and reflective liquid crystal display device incorporating touch panel arranged therefrom |
US6791640B1 (en) | 1997-04-23 | 2004-09-14 | Sharp Kabushiki Kaisha | Reflection liquid crystal display and reflection liquid crystal display provided with built-in touch panel and comprising the same |
US6922220B2 (en) | 1997-04-23 | 2005-07-26 | Sharp Kabushiki Kaisha | Reflective liquid crystal display device and reflective liquid crystal display device incorporating touch panel arranged therefrom |
US6958794B2 (en) | 1997-04-23 | 2005-10-25 | Sharp Kabushiki Kaisha | Reflective liquid crystal display device and reflective liquid crystal display device incorporating touch panel arranged therefrom |
US7023510B2 (en) | 1997-04-23 | 2006-04-04 | Sharp Kabushiki Kaisha | Reflective liquid crystal display device and reflective liquid crystal display device incorporating touch panel arranged therefrom |
US6900865B2 (en) | 1998-03-26 | 2005-05-31 | Sharp Kabushiki Kaisha | Liquid crystal device and display |
JP2001194527A (en) * | 2000-01-14 | 2001-07-19 | Fuji Photo Film Co Ltd | Norbornene resin composition and phase difference plate |
JP2002022943A (en) * | 2000-07-06 | 2002-01-23 | Fuji Photo Film Co Ltd | Optical compensation sheet, polarizing plate and liquid crystal display device |
JP4485024B2 (en) * | 2000-07-06 | 2010-06-16 | 富士フイルム株式会社 | Optical compensation sheet manufacturing method |
JP2002156524A (en) * | 2000-11-20 | 2002-05-31 | Nitto Denko Corp | Circularly polarizing plate, organic el light emitting device and liquid crystal display device |
WO2008062986A1 (en) | 2006-11-20 | 2008-05-29 | Lg Chem, Ltd. | Optical film and method of manufacturing the same |
US8120729B2 (en) | 2006-11-20 | 2012-02-21 | Lg Chem, Ltd. | Optical film and method of manufacturing the same |
JP2009134257A (en) * | 2007-10-31 | 2009-06-18 | Sumitomo Chemical Co Ltd | Retardation film and elliptical polarizing plate using the same |
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