JP2003029039A - Circularly polarizing plate and liquid crystal display device - Google Patents
Circularly polarizing plate and liquid crystal display deviceInfo
- Publication number
- JP2003029039A JP2003029039A JP2001216147A JP2001216147A JP2003029039A JP 2003029039 A JP2003029039 A JP 2003029039A JP 2001216147 A JP2001216147 A JP 2001216147A JP 2001216147 A JP2001216147 A JP 2001216147A JP 2003029039 A JP2003029039 A JP 2003029039A
- Authority
- JP
- Japan
- Prior art keywords
- layers
- polarizing plates
- layer
- circularly polarizing
- birefringent
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/02—Number of plates being 2
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、高コントラストの液晶表
示装置を形成できる、広い波長域で円偏光を与える左右
回り一対の組合せからなる円偏光板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circularly polarizing plate which is capable of forming a high contrast liquid crystal display device and which is composed of a pair of left and right rotating circularly polarized light which gives circularly polarized light in a wide wavelength range.
【０００２】[0002]
【発明の背景】従来、１／４波長板と偏光板を積層して
左回りと右回りの一対の円偏光板としては、１／４波長
板の光軸（遅相軸又は進相軸）を固定系として、偏光板
の吸収軸又は透過軸（偏光軸）を９０度回転させて配置
した関係にあるものが知られていた。またその１／４波
長板としては、複数の複屈折層をそれらの光軸を交差さ
せて積層してなり広い波長域で円偏光を形成するものも
知られていた（特開平５−１００１１４号公報、特開平
１１−２３１１３２号公報、特開平１３−４８３７号公
報等）。2. Description of the Related Art Conventionally, a pair of a left-handed and a right-handed circularly polarizing plate by laminating a quarter-wave plate and a polarizing plate has an optical axis (slow axis or fast axis) of the quarter-wave plate. As a fixed system, there is known a system in which the absorption axis or the transmission axis (polarization axis) of the polarizing plate is rotated by 90 degrees and arranged. Also, as the quarter-wave plate, there has been known one in which a plurality of birefringent layers are laminated with their optical axes intersecting to form circularly polarized light in a wide wavelength range (JP-A-5-100114). Gazette, JP-A-11-231132, JP-A-13-4837, etc.).
【０００３】前記した左右回り一対の円偏光板は、正面
位相差がほぼゼロの状態を利用するτ型等の液晶表示装
置の両側に分配配置して高コントラストを達成すること
などに用いられている。しかしながら、その左右回り一
対の円偏光板を用いて左回り円偏光と右回り円偏光が重
なり合うようにしても黒状態となりにくい問題点があっ
た。この問題は、液晶表示装置に実装した場合に黒表示
に光漏れが生じてコントラストの低下を招く。The above-mentioned pair of left and right circularly polarizing plates are used for achieving high contrast by being distributed and arranged on both sides of a liquid crystal display device such as a τ type which utilizes a state where the front phase difference is substantially zero. There is. However, even if the left-handed circularly polarized light and the right-handed circularly polarized light are overlapped with each other by using the pair of right-and-left circularly polarizing plates, there is a problem that the black state is unlikely to occur. This problem causes light leakage in black display when mounted on a liquid crystal display device, resulting in a reduction in contrast.
【０００４】[0004]
【発明の技術的課題】本発明は、左右回りの円偏光を重
ねて良好な黒状態を形成しうる左右回り一対の円偏光板
を得て、高コントラストな液晶表示装置を得ることを課
題とする。SUMMARY OF THE INVENTION It is an object of the present invention to obtain a high contrast liquid crystal display device by obtaining a pair of right and left circularly polarizing plates which can form a good black state by superposing left and right circularly polarized light. To do.
【０００５】[0005]
【課題の解決手段】本発明は、同数の複屈折層を有する
左回りと右回りの一対の円偏光板からなり、その各円偏
光板は、偏光板と１／４波長の位相差を与える複屈折層
との間に、１／２波長の位相差を与える複屈折層の１層
又は２層以上を前記１／４波長の位相差を与える複屈折
層に対して光軸が交差する状態で有して、その複数の複
屈折層が総和で２００〜１０００nmの波長域の全部又は
一部で１／４波長の位相差を与えるものであり、前記一
対の円偏光板をその偏光板を外側にして対向配置した場
合における一対の円偏光板間における関係において、複
屈折層を偏光板に近い側より第１層、第２層・・・第ｎ
層としたとき、その第１層同士、第２層同士・・・第ｎ
層同士の進相軸及び偏光板同士の透過軸の交差角が８０
〜１００度の範囲内にあることを特徴とする左右回り一
対の円偏光板を提供するものである。The present invention comprises a pair of left-handed and right-handed circularly polarizing plates having the same number of birefringent layers, each circularly polarizing plate providing a phase difference of 1/4 wavelength with the polarizing plates. A state in which the optical axis crosses one or more birefringent layers that give a phase difference of ½ wavelength to the birefringent layer and the birefringent layer that gives a phase difference of ¼ wavelength. And the plurality of birefringent layers give a phase difference of ¼ wavelength in all or part of the wavelength range of 200 to 1000 nm in total, and the pair of circularly polarizing plates are Regarding the relationship between the pair of circularly polarizing plates when they are arranged facing each other outside, the birefringent layers are the first layer, the second layer ...
When the layers are used, the first layers, the second layers, ... The nth layers
The crossing angle between the fast axes of the layers and the transmission axes of the polarizing plates is 80.
The present invention provides a pair of right and left circularly polarizing plates, which are in the range of -100 degrees.
【０００６】また本発明は、前記した左右回り一対の円
偏光板をその偏光板を外側にして液晶セルの両側に分配
配置してなり、その両側における円偏光板間の関係にお
いて、各円偏光板における複屈折層を偏光板に近い側よ
り第１層、第２層・・・第ｎ層としたとき、その第１層
同士、第２層同士・・・第ｎ層同士の進相軸及び偏光板
同士の透過軸の交差角が８０〜１００度の範囲内にある
ことを特徴とする液晶表示装置を提供するものである。Further, according to the present invention, the above-mentioned pair of left and right circularly polarizing plates are distributed and arranged on both sides of the liquid crystal cell with the polarizing plates facing outward. When the birefringent layers in the plate are the first layer, the second layer, ... The nth layer from the side closer to the polarizing plate, the fast axes of the first layers, the second layers, the nth layers And a crossing angle of the transmission axes of the polarizing plates is in the range of 80 to 100 degrees, the present invention provides a liquid crystal display device.
【０００７】[0007]
【発明の効果】本発明によれば、左右回りの円偏光を重
ねて良好な黒状態を形成しうる左右回り一対の円偏光板
を得ることができ、それを用いて高コントラストな表示
の液晶表示装置を形成することができる。これは、円偏
光板に基づく円偏光が短波長側と長波長側の両方で僅か
に変形して楕円偏光化することを防止したことに拠る。According to the present invention, it is possible to obtain a pair of right and left circularly polarizing plates which can form a good black state by superposing left and right circularly polarized light, and by using the same, a liquid crystal of high contrast display. A display device can be formed. This is because circularly polarized light based on the circularly polarizing plate was prevented from being slightly deformed on both the short wavelength side and the long wavelength side to be elliptically polarized.
【０００８】すなわち本発明者らは従来の偏光板の透過
軸等のみを９０度回転させてなる左右回り一対の円偏光
板を用いた液晶表示装置の低コントラスト化を克服する
ために鋭意研究を重ねた結果、各円偏光板に基づく円偏
光が短波長側と長波長側の両方で僅かに変形して楕円偏
光化し、その方位角でズレが生じて直交関係が形成され
ていないことが原因であることを究明し、それを上記し
た構成にて解決したものである。That is, the inventors of the present invention have earnestly studied in order to overcome the low contrast of a liquid crystal display device using a pair of left and right circularly polarizing plates obtained by rotating only the transmission axis of a conventional polarizing plate by 90 degrees. As a result of overlapping, the circularly polarized light based on each circularly polarizing plate is slightly deformed on both the short wavelength side and the long wavelength side to become elliptically polarized light, and there is a deviation in the azimuth angle and no orthogonal relationship is formed. Is solved and it is solved by the above-mentioned composition.
【０００９】[0009]
【発明の実施形態】本発明による一対の円偏光板は、同
数の複屈折層を有する左回りと右回りの一対の円偏光板
からなり、その各円偏光板は、偏光板と１／４波長の位
相差を与える複屈折層との間に、１／２波長の位相差を
与える複屈折層の１層又は２層以上を前記１／４波長の
位相差を与える複屈折層に対して光軸が交差する状態で
有して、その複数の複屈折層が総和で２００〜１０００
nmの波長域の全部又は一部で１／４波長の位相差を与え
るものであり、前記一対の円偏光板をその偏光板を外側
にして対向配置した場合における一対の円偏光板間にお
ける関係において、複屈折層を偏光板に近い側より第１
層、第２層・・・第ｎ層としたとき、その第１層同士、
第２層同士・・・第ｎ層同士の進相軸及び偏光板同士の
透過軸の交差角が８０〜１００度の範囲内にあるものよ
りなる。BEST MODE FOR CARRYING OUT THE INVENTION A pair of circularly polarizing plates according to the present invention comprises a pair of left-handed and right-handed circularly polarizing plates each having the same number of birefringent layers. One or two or more birefringent layers that give a phase difference of ½ wavelength to the birefringent layer that gives a phase difference of ½ wavelength to the birefringent layer that gives a phase difference of ¼ wavelength. With the optical axes intersecting each other, the total number of the birefringent layers is 200 to 1000.
A relationship between a pair of circularly polarizing plates in the case where the pair of circularly polarizing plates are opposed to each other with the polarizing plates on the outside, which gives a phase difference of ¼ wavelength in all or part of the wavelength range of nm. In the first, the birefringent layer is placed from the side closer to the polarizing plate.
Layers, second layers ... When the layers are n-th layers,
Second layers: The crossing angles of the fast axes of the nth layers and the transmission axes of the polarizing plates are in the range of 80 to 100 degrees.
【００１０】前記した一対の円偏光板の例を図１に示し
た。１が左右回りの一方の円偏光板、２が左右回りの他
方の円偏光板であり、１１、２１が偏光板、１２、１
３、２２、２３が１／２波長の位相差を与える複屈折
層、１４、２４が１／４波長の位相差を与える複屈折層
である。なお図は、液晶表示装置したものを示してお
り、３が液晶セルである。An example of the above-mentioned pair of circularly polarizing plates is shown in FIG. Reference numeral 1 is one of the left and right circularly polarizing plates, 2 is the other of the left and right circularly polarizing plates, and 11 and 21 are polarizing plates and 12, 1
3, 22 and 23 are birefringent layers that give a phase difference of ½ wavelength, and 14 and 24 are birefringent layers that give a phase difference of ¼ wavelength. The figure shows a liquid crystal display device, and 3 is a liquid crystal cell.
【００１１】図例の如く左右回り一対の組合せによる各
円偏光板１、２としては、偏光板１１、２１と１／４波
長の位相差を与える複屈折層１４、２４との間に、１／
２波長の位相差を与える複屈折層１２、１３、２２、２
３の１層又は２層以上を、１／４波長の位相差を与える
複屈折層に対して光軸が交差する状態で有し、かつその
複数の複屈折層が総和で２００〜１０００nmの波長域の
全部又は一部で１／４波長の位相差を与える同数の複屈
折層を有するものが用いられる。As shown in the figure, the circularly polarizing plates 1 and 2 formed by a pair of left and right rotations are arranged between the polarizing plates 11 and 21 and the birefringent layers 14 and 24 for providing a phase difference of 1/4 wavelength. /
Birefringent layers 12, 13, 22, 2 that give a phase difference of two wavelengths
3 has one layer or two or more layers in a state where the optical axis intersects with a birefringent layer that gives a phase difference of ¼ wavelength, and the plurality of birefringent layers have a total wavelength of 200 to 1000 nm. Those having the same number of birefringent layers that give a phase difference of ¼ wavelength in all or part of the region are used.
【００１２】円偏光板を形成する偏光板と複屈折層とし
ては適宜なものを用いることができ、その種類について
特に限定はない。ちなみに偏光板としては、直線偏光を
透過して他の光は吸収する適宜なものを用いることがで
き、例えばポリビニルアルコール系フィルムや部分ホル
マール化ポリビニルアルコール系フィルム、エチレン・
酢酸ビニル共重合体系部分ケン化フィルムの如き親水性
高分子フィルムにヨウ素及び／又は二色性染料を吸着さ
せて延伸処理したもの、あるいはその偏光フィルムの片
面又は両面を透明保護層で保護したものなどがあげられ
る。Appropriate materials can be used as the polarizing plate and the birefringent layer forming the circularly polarizing plate, and the types thereof are not particularly limited. By the way, as the polarizing plate, it is possible to use an appropriate one that transmits linearly polarized light and absorbs other light. For example, a polyvinyl alcohol film or a partially formalized polyvinyl alcohol film, ethylene.
A hydrophilic polymer film such as a vinyl acetate copolymer partially saponified film which is adsorbed with iodine and / or a dichroic dye and stretched, or a polarizing film whose one or both sides are protected by a transparent protective layer. And so on.
【００１３】前記の透明保護層は、適宜なポリマーにて
形成することができる。就中、透明性や機械的強度、熱
安定性や水分遮蔽性等に優れるポリマーからなる透明保
護層が好ましい。透明保護層は、ポリマー液の塗布方式
やフィルムとしたものの接着積層方式などの適宜な方式
で形成することができる。The transparent protective layer can be formed of an appropriate polymer. Above all, a transparent protective layer made of a polymer having excellent transparency, mechanical strength, thermal stability and moisture shielding property is preferable. The transparent protective layer can be formed by an appropriate method such as a coating method of a polymer liquid or an adhesive lamination method of a film.
【００１４】ちなみに前記ポリマーの例としては、二酢
酸セルロースや三酢酸セルロースの如きセルロース系ポ
リマー、ポリエチレンテレフタレートやポリエチレンナ
フタレートの如きポリエステル系ポリマー、ポリエチレ
ンやポリプロピレン、シクロ系ないしノルボルネン構造
を有するポリオレフィンやエチレン・プロピレン共重合
体の如きオレフィン系ポリマー、ナイロンや芳香族ポリ
アミドの如きアミド系ポリマー、ポリカーボネート系ポ
リマーやポリメチルメタクリレートの如きアクリル系ポ
リマー、ポリスチレンやアクリロニトリル・スチレン共
重合体の如きスチレン系ポリマーがあげられる。Incidentally, examples of the above-mentioned polymer include cellulose-based polymers such as cellulose diacetate and cellulose triacetate, polyester-based polymers such as polyethylene terephthalate and polyethylene naphthalate, polyethylene and polypropylene, polyolefins and ethylene having a cyclo- or norbornene structure.・ Olefin polymers such as propylene copolymers, amide polymers such as nylon and aromatic polyamides, acrylic polymers such as polycarbonate polymers and polymethylmethacrylate, styrene polymers such as polystyrene and acrylonitrile-styrene copolymers. To be
【００１５】またイミド系ポリマーやスルホン系ポリマ
ー、ポリエーテルスルホン系ポリマーやポリエーテルエ
ーテルケトン系ポリマー、ポリフェニレンスルフィド系
ポリマーやビニルアルコール系ポリマー、アリレート系
ポリマーやポリオキシメチレン系ポリマー、エポキシ系
ポリマーやビニルブチラール系ポリマー、前記ポリマー
のブレンド物、あるいはポリエステル系やアクリル系、
ウレタン系やアミド系、シリコーン系やエポキシ系等の
熱や紫外線照射等で硬化するポリマーなども透明保護層
形成用ポリマーの例としてあげられる。就中、三酢酸セ
ルロースフィルムの如く等方性に優れるものが好ましく
用いられる。Further, imide type polymers, sulfone type polymers, polyether sulfone type polymers, polyether ether ketone type polymers, polyphenylene sulfide type polymers, vinyl alcohol type polymers, arylate type polymers, polyoxymethylene type polymers, epoxy type polymers and vinyl. Butyral-based polymers, blends of the above polymers, or polyester-based or acrylic-based polymers,
Examples of the polymer for forming the transparent protective layer include urethane-based, amide-based, silicone-based and epoxy-based polymers that are cured by heat or ultraviolet irradiation. Above all, those having excellent isotropy such as cellulose triacetate film are preferably used.
【００１６】一方、複屈折層の例としてはディスコチッ
ク系やネマチック系の如き液晶ポリマーや重合性液晶等
の液晶材料、無機材料などの屈折率異方性を有する材料
を配向固定化した単層物、又はその屈折率異方性を有す
る材料を等方性又は異方性の基材上にコーティングして
配向固定化した複層物などがあげられる。また前記した
透明保護層形成用ポリマー等からなる高分子フィルムを
一軸や二軸等の方式で延伸処理したフィルムなどの如く
適宜な配向処理を施したフィルムからなる複屈折層など
もあげられる。また熱収縮性フィルムとの接着下に収縮
力又は／及び延伸力を付与する方式などにより高分子フ
ィルムの厚さ方向の屈折率を制御した複屈折層などであ
ってもよい。透明性（光透過率）に優れる複屈折層が好
ましい。On the other hand, as an example of the birefringent layer, a single layer in which a liquid crystal material such as a discotic or nematic liquid crystal polymer or a polymerizable liquid crystal, or a material having a refractive index anisotropy such as an inorganic material is fixed and oriented. Examples thereof include a multilayered product obtained by coating an isotropic or anisotropic substrate with a material having a refractive index anisotropy thereof and fixing the orientation thereof. Further, a birefringent layer formed of a film subjected to an appropriate orientation treatment, such as a film obtained by stretching a polymer film made of the above-mentioned polymer for forming a transparent protective layer by a uniaxial or biaxial method, etc. Further, it may be a birefringent layer in which the refractive index in the thickness direction of the polymer film is controlled by a method of applying shrinkage force and / or stretching force while adhering to the heat-shrinkable film. A birefringent layer having excellent transparency (light transmittance) is preferable.
【００１７】応カによる位相差変化を抑制する点より好
ましい複屈折層は、波長６３３nmの光に基づく光弾性係
数が５×１０−１１ｍ２／Ｎ以下、就中１×１０−１１
ｍ２／Ｎ以下、特に７×１０−１２ｍ２／Ｎ以下のもの
である。斯かる光弾性係数の点よりは、前記の液晶材料
を用いてなる複屈折層が好ましい。これらは一般的に光
弾性係数が小さく偏光板の変形による位相差変化や進相
軸の変化が小さくてコントラストを低下させにくい。ま
た高分子フィルムからなる複屈折層では、その複屈折の
波長依存性や光弾性係数、積層用粘着剤との屈折率差に
よる界面反射の抑制などの点よりオレフィン系ポリマ
ー、特にノルボルネン系ポリマー、酢酸セルロース系ポ
リマーやポリメチルメタクリレート系ポリマーなどから
なるものが好ましい。The birefringent layer which is more preferable from the viewpoint of suppressing the phase difference change due to the response has a photoelastic coefficient of 5 × 10 −11 m 2 / N or less based on light having a wavelength of 633 nm, especially 1 × 10 −11.
m 2 / N or less, particularly 7 × 10 −12 m 2 / N or less. From the viewpoint of such a photoelastic coefficient, a birefringent layer made of the above liquid crystal material is preferable. Generally, these have a small photoelastic coefficient and a small change in the phase difference or the change in the fast axis due to the deformation of the polarizing plate, so that it is difficult to reduce the contrast. Further, in the birefringent layer made of a polymer film, an olefin-based polymer, especially a norbornene-based polymer, from the viewpoints of wavelength dependence of birefringence and photoelastic coefficient, and suppression of interfacial reflection due to a difference in refractive index with a laminating adhesive, Those composed of a cellulose acetate polymer or a polymethylmethacrylate polymer are preferred.
【００１８】複屈折層は、１／４波長の位相差を与える
複屈折層と１／２波長の位相差を与える複屈折層の組合
せで用いて、それらの総和として２００〜１０００nmの
波長域の全部又は一部で１／４波長の位相差を与えるも
のとされる。その場合、１／２波長の位相差を与える複
屈折層は、偏光板と１／４波長の位相差を与える複屈折
層との間に配置され、１層又は２層以上を配置すること
ができる。その配置数は、４層以下、就中３層以下が一
般的であるが、５層以上であってもよい。The birefringent layer is used in a combination of a birefringent layer that gives a phase difference of ¼ wavelength and a birefringent layer that gives a phase difference of ½ wavelength, and the total of them is in the wavelength range of 200 to 1000 nm. All or part of them are supposed to give a phase difference of ¼ wavelength. In that case, the birefringent layer which gives a phase difference of ½ wavelength is arranged between the polarizing plate and the birefringent layer which gives a phase difference of ¼ wavelength, and one layer or two or more layers may be arranged. it can. The number of arrangements is generally 4 or less, especially 3 or less, but may be 5 or more.
【００１９】円偏光板を形成する各複屈折層は、同一の
材料で形成されていてもよいし、異なる材料で形成され
ていてもよい。各複屈折層が同一の形成材料からなる場
合には、屈折率ないし複屈折の波長分散特性が同じとな
り、同じ波長光に対して１／２波長板と１／４波長板と
して機能するものの組合せとすることができる。また各
複屈折層が異なる形成材料からなる場合には屈折率ない
し複屈折の波長分散特性が相違するものの組合せとする
ことができる。The birefringent layers forming the circularly polarizing plate may be made of the same material or different materials. When the birefringent layers are made of the same forming material, the wavelength dispersion characteristics of the refractive index or the birefringence are the same, and a combination of those functioning as a ½ wavelength plate and a ¼ wavelength plate for the same wavelength light. Can be When the respective birefringent layers are made of different forming materials, a combination of materials having different wavelength dispersion characteristics of refractive index or birefringence can be used.
【００２０】各複屈折層は、単層物であってもよいし、
２層又は３層以上の位相差フィルム等を積層して位相差
特性を調節したものであってもよい。その場合も積層す
る位相差フィルムはその形成材料が同一種のものであっ
てもよいし、異種のものであってもよい。なお複屈折層
が与える１／４波長や１／２波長等の位相差の制御は、
例えば形成材料の種類や層厚、配向条件を変える方式や
前記積層化などの適宜な方法にて行うことができる。複
屈折層における光軸の方向にバラツキがある場合にはそ
の平均方向に基づいて遅相軸等は決定される。Each birefringent layer may be a single layer,
The retardation film may be one in which two or more layers of retardation films or the like are laminated to adjust the retardation characteristics. Also in this case, the retardation films to be laminated may be made of the same material or different materials. The control of the phase difference such as ¼ wavelength and ½ wavelength provided by the birefringent layer is
For example, it can be performed by an appropriate method such as a method of changing the kind of the forming material, the layer thickness, or the alignment condition, or the above-mentioned lamination. When there is variation in the direction of the optical axis in the birefringent layer, the slow axis and the like are determined based on the average direction.
【００２１】上記した総和として２００〜１０００nmの
波長域の全部又は一部で１／４波長の位相差を与えるも
のの形成は、例えば当該波長域におけるそれぞれ別個の
波長に対して１／４波長の位相差を与える複屈折層と１
／２波長の位相差を与える複屈折層、特に１／２波長の
位相差を与えるものの複数を種々の組合せで積層するこ
とにより行うことができる。またそれら複屈折層の光軸
の交差角度を変化させることによっても行うことができ
る。なお前記波長域の一部で１／４波長の位相差を与え
るものの場合、その一部は２００〜１０００nmの波長域
の５０％以上、就中６０％以上、特に７０％以上の範囲
であることが表示特性等の点より好ましい。The formation of the above-mentioned one that gives a phase difference of ¼ wavelength in all or a part of the wavelength range of 200 to 1000 nm as a total is performed, for example, at a position of ¼ wavelength with respect to each individual wavelength in the wavelength range. Birefringent layer that gives a phase difference and 1
It can be carried out by laminating a plurality of birefringent layers which give a phase difference of / 2 wavelengths, particularly a plurality of layers which give a phase difference of 1/2 wavelength in various combinations. It can also be performed by changing the crossing angle of the optical axes of these birefringent layers. In the case where a part of the wavelength range gives a phase difference of ¼ wavelength, a part of the wavelength range of 200 to 1000 nm is 50% or more, preferably 60% or more, and particularly 70% or more. Is preferable in view of display characteristics and the like.
【００２２】本発明による一対の円偏光板は、同数の複
屈折層を設けてなる円偏光板を左回りのものと右回りの
ものの組合せで用いたものであり、その各円偏光板にお
ける１／４波長の位相差を与える複屈折層と１／２波長
の位相差を与える複屈折層とはそれらの光軸が交差する
状態にあり、かつその一対の円偏光板を偏光板を外側に
して対向配置した場合における一対の円偏光板間におけ
る関係において、複屈折層を偏光板に近い側より第１
層、第２層・・・第ｎ層としたとき、その第１層同士、
第２層同士・・・第ｎ層同士の進相軸及び偏光板同士の
透過軸の交差角が８０〜１００度、就中８５〜９５度の
範囲内にある組合せからものである。なお前記した複屈
折層同士の進相軸及び偏光板同士の透過軸の交差関係
は、複屈折層同士の遅相軸及び偏光板同士の吸収軸の交
差関係で置換することもできる。A pair of circularly polarizing plates according to the present invention is a combination of left and right circularly polarizing plates having the same number of birefringent layers. The optical axes of the birefringent layer that gives a phase difference of / 4 wavelength and the birefringent layer that gives a phase difference of ½ wavelength are in a state where their optical axes intersect, and the pair of circularly polarizing plates are placed outside the polarizing plates. In the relationship between the pair of circularly polarizing plates when they are arranged opposite to each other, the birefringent layer is arranged from the side closer to the polarizing plate to the first side.
Layers, second layers ... When the layers are n-th layers,
Second layers: A combination in which the crossing angles of the fast axes of the nth layers and the transmission axes of the polarizing plates are in the range of 80 to 100 degrees, especially 85 to 95 degrees. The cross relationship between the fast axes of the birefringent layers and the transmission axes of the polarizing plates may be replaced with the cross relationship of the slow axes of the birefringent layers and the absorption axes of the polarizing plates.
【００２３】前記の交差関係は、例えば偏光板の吸収軸
の角度をθ０、１／２波長の位相差を与える複屈折層の
遅相軸の角度をその配置数に応じてθ１・・・θ（ｎ−
１）、１／４波長の位相差を与える複屈折層の遅相軸の
角度をθｎとしたとき、１／２波長の位相差を与える複
屈折層の遅相軸の角度を下記の式１で決定し、１／４波
長の位相差を与える複屈折層の遅相軸の角度を下記の式
２で決定して、それにより一方の円偏光板を形成し、そ
の円偏光板における偏光板の吸収軸の角度及び各複屈折
層の遅相軸の角度に８０〜１００度を加えると共に、表
裏逆転による補正を施した角度で他方の円偏光板を形成
することにより達成することができる。
式１：θ０＋２×θ１＋・・・２×θ（ｎ−２）＋θ
（ｎ−１）、又は
θ０−２×θ１−・・・２×θ（ｎ−２）−θ（ｎ−
１）
式２：θ０＋２×θ１＋・・・２×θ（ｎ−１）＋４５
度、又は
θ０−２×θ１−・・・２×θ（ｎ−１）−４５度The above-mentioned cross relationship is, for example, the angle of the absorption axis of the polarizing plate is θ0, and the angle of the slow axis of the birefringent layer that gives a phase difference of ½ wavelength is θ1 ... θ. (N-
1), where θn is the angle of the slow axis of the birefringent layer that gives a phase difference of ¼ wavelength, the angle of the slow axis of the birefringent layer that gives a phase difference of ½ wavelength is expressed by the following formula 1 The angle of the slow axis of the birefringent layer that gives a phase difference of ¼ wavelength is determined by the following equation 2 to form one circularly polarizing plate, and the polarizing plate in the circularly polarizing plate is determined. This can be achieved by adding 80 to 100 degrees to the angle of the absorption axis and the angle of the slow axis of each birefringent layer, and forming the other circularly polarizing plate at the angle corrected by the front and back inversion. Formula 1: θ0 + 2 × θ1 + ... 2 × θ (n-2) + θ
(N-1), or θ0-2 × θ1 -... 2 × θ (n-2) -θ (n-
1) Formula 2: θ0 + 2 × θ1 + ... 2 × θ (n-1) +45
Degree or θ0-2 × θ1 -... 2 × θ (n-1) -45 °
【００２４】ちなみに前記に基づくと、例えば１／２波
長の位相差を与える複屈折層が１層である場合、一方の
円偏光板における１／２波長の位相差を与える複屈折層
の遅相軸の角度は、θ０＋θ１又はθ０−θ１にて算出
される。またそれに対する１／４波長の位相差を与える
複屈折層の遅相軸の角度は、θ０＋２×θ１＋４５度又
はθ０−２×θ１−４５度にて算出される。その場合、
偏光板の吸収軸の角度θ０は任意であり、θ１は５〜２
５度が好ましい。Incidentally, based on the above, for example, when the birefringent layer which gives a phase difference of ½ wavelength is one layer, the retardation of the birefringent layer which gives a phase difference of ½ wavelength in one circularly polarizing plate. The axis angle is calculated by θ0 + θ1 or θ0−θ1. Further, the angle of the slow axis of the birefringent layer that gives a phase difference of ¼ wavelength to that is calculated by θ0 + 2 × θ1 + 45 degrees or θ0-2 × θ1-45 degrees. In that case,
The angle θ0 of the absorption axis of the polarizing plate is arbitrary, and θ1 is 5 to 2
5 degrees is preferred.
【００２５】一方、１／２波長の位相差を与える複屈折
層が２層である場合、一方の円偏光板における１／２波
長の位相差を与える複屈折層の遅相軸の角度は、第１
層：前記と同じ、第２層：θ０＋２×θ１＋θ２又はθ
０−２×θ１−θ２にて算出される。またそれに対する
１／４波長の位相差を与える複屈折層（第３層）の遅相
軸の角度は、θ０＋２×θ１＋２×θ２＋４５度又はθ
０−２×θ１−２×θ２−４５度にて算出される。その
場合、偏光板の吸収軸の角度θ０は任意であり、θ１は
５〜１５度、θ２は１０〜３０度が好ましい。On the other hand, when the birefringent layer that gives a phase difference of ½ wavelength is two layers, the angle of the slow axis of the birefringent layer that gives a phase difference of ½ wavelength in one circularly polarizing plate is: First
Layer: same as above, second layer: θ0 + 2 × θ1 + θ2 or θ
It is calculated by 0-2 × θ1-θ2. Further, the angle of the slow axis of the birefringent layer (third layer) that gives a phase difference of ¼ wavelength to that is θ0 + 2 × θ1 + 2 × θ2 + 45 degrees or θ
It is calculated by 0-2 × θ1-2 × θ2-45 degrees. In that case, the angle θ0 of the absorption axis of the polarizing plate is arbitrary, and θ1 is preferably 5 to 15 degrees and θ2 is preferably 10 to 30 degrees.
【００２６】さらに１／２波長の位相差を与える複屈折
層が３層である場合、一方の円偏光板における１／２波
長の位相差を与える複屈折層の遅相軸の角度は、第１層
及び第２層：前記と同じ、第３層：θ０＋２×θ１＋２
×θ２＋θ３又はθ０−２×θ１−２×θ２−θ３にて
算出される。またそれに対する１／４波長の位相差を与
える複屈折層（第４層）の遅相軸の角度は、θ０＋２×
θ１＋２×θ２＋２×θ３＋４５度又はθ０−２×θ１
−２×θ２−２×θ３−４５度にて算出される。その場
合、偏光板の吸収軸の角度θ０は任意であり、θ１は１
〜１０度、θ２は１０〜３０度、θ３は２０〜６０度が
好ましい。When the birefringent layer which gives a phase difference of ½ wavelength is three layers, the angle of the slow axis of the birefringent layer which gives a phase difference of ½ wavelength in one circularly polarizing plate is First layer and second layer: same as above, third layer: θ0 + 2 × θ1 + 2
It is calculated by × θ2 + θ3 or θ0-2 × θ1-2 × θ2-θ3. The angle of the slow axis of the birefringent layer (fourth layer) that gives a phase difference of ¼ wavelength to that is θ0 + 2 ×
θ1 + 2 × θ2 + 2 × θ3 + 45 degrees or θ0-2 × θ1
It is calculated as −2 × θ2−2 × θ3−45 degrees. In that case, the angle θ0 of the absorption axis of the polarizing plate is arbitrary, and θ1 is 1
It is preferable that 10 to 10 degrees, θ2 be 10 to 30 degrees, and θ3 be 20 to 60 degrees.
【００２７】なお円偏光板における偏光板や各複屈折層
は、重ね合わせ状態にあってもよいが、光軸のズレ防止
やゴミの侵入防止などの点より接着処理されていること
が好ましい。円偏光板を形成する素材の積層一体化は、
光軸のズレ防止による品質の安定化等に加えて、液晶表
示装置の組立効率の向上などの点よりも好ましい。The polarizing plate and the respective birefringent layers in the circularly polarizing plate may be in a superposed state, but they are preferably subjected to an adhesive treatment from the viewpoint of preventing deviation of the optical axis and preventing invasion of dust. The integrated layering of the materials that form the circularly polarizing plate
This is preferable in terms of improving the assembly efficiency of the liquid crystal display device in addition to stabilizing the quality by preventing the deviation of the optical axis.
【００２８】前記の接着処理は、例えば透明な接着剤な
いし粘着剤による方式などの適宜な方式で行うことがで
き、その接着剤等の種類についても特に限定はない。偏
光板や複屈折層の光学特性の変化防止の点より硬化や乾
操の際に高温プロセスを要しないものが好ましく、長時
間の硬化処理や乾燥時間を要しないものが望ましい。ま
た界面反射の抑制を目的に積層する材料同士の可及的に
真ん中の屈折率を有する接着剤等を用いることが好まし
い。The above-mentioned adhesion treatment can be carried out by an appropriate method such as a method using a transparent adhesive or a pressure-sensitive adhesive, and the kind of the adhesive is not particularly limited. From the viewpoint of preventing changes in the optical properties of the polarizing plate and the birefringent layer, those that do not require a high temperature process during curing or drying are preferred, and those that do not require a long curing process or drying time are desirable. For the purpose of suppressing interface reflection, it is preferable to use an adhesive or the like having a refractive index in the middle of the materials to be laminated.
【００２９】円偏光板には液晶セル等の被着体への接着
を目的とした粘着層等を必要に応じて設けることができ
る。その粘着層等が表面に露出する場合には実用に供す
るまでの間、汚染防止等の保護を目的にその表面をセパ
レータ５などで仮着カバーしておくこともできる。また
円偏光板の形成素材が表面に露出する場合には、その露
出表面を表面保護フィルムにて接着カバーして傷付き等
から保護することもできるIf necessary, an adhesive layer or the like for adhering to an adherend such as a liquid crystal cell may be provided on the circularly polarizing plate. When the adhesive layer or the like is exposed on the surface, the surface can be temporarily covered with a separator 5 or the like for the purpose of protection such as prevention of contamination until it is put to practical use. When the material for forming the circularly polarizing plate is exposed on the surface, the exposed surface can be covered with a surface protective film to protect it from scratches.
【００３０】本発明による一対の円偏光板は、従来に準
じた各種の用途に用いうる。特に正面位相差がほぼゼロ
の状態を利用するτ型等の高コントラストを達成しうる
液晶表示装置の形成になど好ましく用いうる。その液晶
表示装置は、例えば図例の如く左右回り一対の円偏光板
１、２をその偏光板１１、２１が外側となるように液晶
セル３の両側に分配配置する方式などにより形成するこ
とができる。The pair of circularly polarizing plates according to the present invention can be used for various purposes according to conventional methods. In particular, it can be preferably used for forming a liquid crystal display device capable of achieving a high contrast such as τ type utilizing the state where the front phase difference is almost zero. The liquid crystal display device can be formed, for example, by a method in which a pair of left and right circularly polarizing plates 1 and 2 are distributed and arranged on both sides of the liquid crystal cell 3 so that the polarizing plates 11 and 21 are on the outside as shown in the figure. it can.
【００３１】前記の場合に液晶セル（３）の両側におけ
る円偏光板（１、２）の間における関係において、各円
偏光板における複屈折層を偏光板に近い側より第１層、
第２層・・・第ｎ層としたとき、その第１層同士（１２
と２２）、第２層同士（１３と２３）、第３層同士（１
４と２４）・・・第ｎ層同士の進相軸（遅相軸）及び偏
光板同士の透過軸（吸収軸）の交差角が８０〜１００
度、就中８５〜９５度の範囲となるように配置すること
により高コントラストの表示を達成することができる。In the above case, in the relationship between the circularly polarizing plates (1, 2) on both sides of the liquid crystal cell (3), the birefringent layer in each circularly polarizing plate is the first layer from the side closer to the polarizing plate,
Second layer: When the n-th layer is used, the first layers (12
And 22), second layers (13 and 23), third layers (1
4 and 24) ... The crossing angle between the fast axis (slow axis) of the nth layers and the transmission axis (absorption axis) of the polarizing plates is 80 to 100.
By arranging so as to be in the range of 85 to 95 degrees, especially high contrast display can be achieved.
【００３２】本発明による一対の円偏光板を用いた液晶
表示装置は、バックライト等を備えた透過型のものとし
て形成することができるし、背面に反射層等を備えた反
射型のものとして形成することもできる。また液晶セル
等の側面に光源を具備し、背面に反射層等を具備して外
光／照明両用型の液晶表示装置なども形成することがで
きる。その場合には照明モード（透過表示）で高コント
ラストを持ち、かつ外光モード（反射表示）で可視光域
全体にわたり優れた表示特性とすることができる。The liquid crystal display device using the pair of circularly polarizing plates according to the present invention can be formed as a transmissive type device having a backlight or the like, or as a reflective type device having a reflective layer or the like on the back surface. It can also be formed. Further, a light source is provided on a side surface of a liquid crystal cell or the like, and a reflective layer or the like is provided on a back surface, so that an external light / illumination type liquid crystal display device or the like can be formed. In that case, a high contrast can be obtained in the illumination mode (transmissive display), and excellent display characteristics can be obtained over the entire visible light region in the external light mode (reflective display).
【００３３】前記において液晶セルの視認側に設ける円
偏光板には、その表面に防眩層や反射防止層などを設け
ることもできる。防眩層は、表面で反射する外光を散乱
させて、また反射防止層は外光の表面反射を抑制して、
表面反射光がギラツキ等として表示装置透過光の視認を
害することの防止などを目的に施されるものである。従
って防眩層と反射防止層は、その両方を設けて表面反射
光による視認阻害防止のより向上を図ることもできる。The circular polarizing plate provided on the viewing side of the liquid crystal cell may be provided with an antiglare layer or an antireflection layer on the surface thereof. The antiglare layer scatters external light reflected on the surface, and the antireflection layer suppresses surface reflection of external light,
The purpose is to prevent the surface-reflected light from causing glare or the like to impair the visibility of the light transmitted through the display device. Therefore, both the antiglare layer and the antireflection layer can be provided to further improve the prevention of visual interference due to the surface reflected light.
【００３４】防眩層や反射防止層については、特に限定
はなく前記の機能を示す適宜なものとして形成すること
ができる。ちなみに防眩層は、光散乱反射性の微細凹凸
構造として形成することができる。また反射防止層は、
真空蒸着方式やイオンプレーティング方式、スパッタリ
ング方式等の蒸着方式やメッキ方式、ゾルゲル方式など
の適宜なコート方式による例えば屈折率の異なる無機酸
化物の多層コート膜やフッ素系化合物等の低屈折材料の
コート膜等からなる干渉膜などにより形成することがで
きる。The antiglare layer and the antireflection layer are not particularly limited and can be formed as appropriate ones having the above-mentioned functions. Incidentally, the antiglare layer can be formed as a fine uneven structure having a light scattering reflection property. The antireflection layer is
Vacuum evaporation method, ion plating method, evaporation method such as sputtering method, plating method, appropriate coating method such as sol-gel method, for example, multi-layer coating film of inorganic oxides with different refractive index, low refractive index material such as fluorine compound It can be formed by an interference film made of a coat film or the like.
【００３５】[0035]
【実施例】参考例１
波長６３３nmの光に基づく光弾性係数（以下同じ）が
４．１×１０−１２ｍ２／Ｎで厚さが１００μmのノル
ボルネン系樹脂フィルム（ＪＳＲ社製、アートンフィル
ム）を１７５℃で５０％延伸処理し、波長５５０nmの光
に対してその複屈折光（以下同じ）が１／２波長の位相
差を与えるλ／２延伸フィルムを得た。EXAMPLES Reference Example 1 Norbornene-based resin film (manufactured by JSR, Arton film) having a photoelastic coefficient (hereinafter the same) of 4.1 × 10 −12 m 2 / N based on light having a wavelength of 633 nm and a thickness of 100 μm. Was subjected to 50% stretching treatment at 175 ° C. to obtain a λ / 2 stretched film whose birefringent light (hereinafter the same) gives a phase difference of ½ wavelength to light having a wavelength of 550 nm.
【００３６】参考例２
参考例１に準じ２５％の延伸処理を施して１／４波長の
位相差を与えるλ／４延伸フィルムを得た。Reference Example 2 A 25% stretched film was obtained according to Reference Example 1 to obtain a λ / 4 stretched film giving a retardation of ¼ wavelength.
【００３７】参考例３
光弾性係数が８×１０−１１ｍ２／Ｎで厚さが５０μm
のポリカーボネートフィルムを１５０℃で５％延伸処理
し、１／２波長の位相差を与えるλ／２延伸フィルムを
得た。Reference Example 3 The photoelastic coefficient is 8 × 10 −11 m 2 / N and the thickness is 50 μm.
Was stretched at 150 ° C. for 5% to obtain a λ / 2 stretched film giving a retardation of ½ wavelength.
【００３８】参考例４
参考例３に準じ２．５％の延伸処理を施して１／４波長
の位相差を与えるλ／４延伸フィルムを得た。Reference Example 4 A λ / 4 stretched film giving a retardation of ¼ wavelength was obtained by subjecting to 2.5% stretching treatment according to Reference Example 3.
【００３９】実施例１
参考例１で得たλ／２延伸フィルムと参考例２で得たλ
／４延伸フィルムをそれらの光軸（遅相軸）が６２．５
度の角度で交差するように粘着層を介して積層し、かつ
そのλ／２延伸フィルム上に粘着層を介し偏光板（日東
電工社製、ＮＰＦ−ＨＥＧ１４２５ＤＵ）を積層して右
回り円偏光板を得た。これは偏光板の吸収軸を０度とし
て、λ／２延伸フィルムの遅相軸が１７．５度、λ／４
延伸フィルムの遅相軸が８０度で交差するものである。Example 1 λ / 2 stretched film obtained in Reference Example 1 and λ obtained in Reference Example 2
/ 4 stretched film has an optical axis (slow axis) of 62.5
Right-handed circularly polarizing plate by laminating a polarizing plate (NPF-HEG1425DU manufactured by Nitto Denko Co., Ltd.) on the λ / 2 stretched film through the adhesive layer so as to intersect at an angle of degrees. Got This means that the absorption axis of the polarizing plate is 0 degree, the slow axis of the λ / 2 stretched film is 17.5 degrees, and λ / 4.
The slow axis of the stretched film intersects at 80 degrees.
【００４０】一方、前記に準じて光軸が全て直交する状
態として左回り円偏光板を得た。これは偏光板の吸収軸
を９０度として、λ／２延伸フィルムの遅相軸が１０
７．５度、λ／４延伸フィルムの遅相軸が１７０度で交
差するものである。なおλ／２延伸フィルムとλ／４延
伸フィルムの積層体は、左右回りいずれの場合にも２０
０〜１０００nmの波長域の全部で１／４波長の位相差を
与えるものであった。On the other hand, according to the above, a counterclockwise circularly polarizing plate was obtained in a state where all the optical axes were orthogonal to each other. This is because the absorption axis of the polarizing plate is 90 degrees and the slow axis of the λ / 2 stretched film is 10 degrees.
7.5 °, the slow axis of the λ / 4 stretched film intersects at 170 °. The laminated body of the λ / 2 stretched film and the λ / 4 stretched film is 20
The phase difference of 1/4 wavelength was given in the entire wavelength range of 0 to 1000 nm.
【００４１】実施例２
右回り及び左回りの各円偏光板におけるλ／４延伸フィ
ルムに代えて、液晶ポリマーを配向固定化してなる、１
／４波長の位相差を与えるλ／４フィルムを用いた他は
実施例１に準じて左右回り一対の円偏光板を得た。この
λ／４フィルムの光弾性係数は１×１０−１１ｍ２／Ｎ
であり、λ／２延伸フィルムとλ／４フィルムの積層体
は、左右回りいずれの場合にも２００〜１０００nmの波
長域の全部で１／４波長の位相差を与えるものであっ
た。Example 2 In place of the λ / 4 stretched film in each of the clockwise and counterclockwise circularly polarizing plates, a liquid crystal polymer was aligned and fixed to 1
A pair of left and right circularly polarizing plates was obtained in the same manner as in Example 1 except that a λ / 4 film that gives a phase difference of / 4 wavelength was used. The photoelastic coefficient of this λ / 4 film is 1 × 10 −11 m 2 / N.
The laminate of the λ / 2 stretched film and the λ / 4 film provided a retardation of ¼ wavelength in the entire wavelength range of 200 to 1000 nm regardless of whether the film was rotated left or right.
【００４２】比較例１
左回り円偏光板として、偏光板の吸収軸を９０度とし
て、λ／２延伸フィルムの遅相軸が１７．５度、λ／４
延伸フィルムの遅相軸が８０度で交差するもの、従って
偏光板の透過軸が０度か９０度の点でのみ相違する左右
回り一対の円偏光板を実施例１に準じて得た。Comparative Example 1 As a counterclockwise circularly polarizing plate, the absorption axis of the polarizing plate was 90 degrees, and the slow axis of the λ / 2 stretched film was 17.5 degrees and λ / 4.
According to Example 1, a pair of right and left circularly polarizing plates differing only in that the slow axes of the stretched films intersect at 80 degrees, and thus the transmission axes of the polarizing plates differ only at 0 or 90 degrees.
【００４３】比較例２
λ／２延伸フィルムとして参考例３で得たもの、及びλ
／４延伸フィルムとして参考例４で得たものを用いたほ
かは実施例１に準じて左右回り一対の円偏光板を得た。Comparative Example 2 λ / 2 stretched film obtained in Reference Example 3 and λ
A pair of left and right circularly polarizing plates was obtained in the same manner as in Example 1 except that the / 4 stretched film obtained in Reference Example 4 was used.
【００４４】評価試験
実施例、比較例で得た左右回り一対の円偏光板をその偏
光板を外側にして、かつそれらの吸収軸が直交するよう
に対向配置して下記の方法にコントラストと黒表示を評
価した。
コントラスト：前記した左右回り一対の円偏光板の配置
による透過率を黒表示とし、右回り円偏光板同士を組合
せた場合の透過率を白表示としてコントラストを算出し
た。
黒表示の見栄え：前記した左右回り一対の円偏光板の配
置による黒表示を目視にて判定した。Evaluation Test A pair of right and left circularly polarizing plates obtained in Examples and Comparative Examples were arranged facing each other with the polarizing plates on the outside and their absorption axes were orthogonal to each other, and the contrast and black were measured by the following method. The display was evaluated. Contrast: The contrast was calculated by setting the transmittance of the pair of left and right circularly polarizing plates described above to black display and the transmittance of the combination of right circularly polarizing plates to white display. Appearance of black display: The black display due to the arrangement of the pair of right and left circularly polarizing plates was visually determined.
【００４５】前記の結果を下記に示した。 実施例１ 実施例２ 比較例１ 比較例２ コントラスト ８４３４ ６７５２ ２６４ ５０ 黒表示の見栄え 良好 良好 光漏れ、着色 著しく光漏れThe above results are shown below. Example 1 Example 2 Comparative Example 1 Comparative Example 2 Contrast 8434 6752 264 50 Good appearance of black display Good Light leakage, coloring Remarkable light leakage
【図１】実施例の断面図FIG. 1 is a sectional view of an embodiment.
１、２：左右回り一対の組合せからなる円偏光板
１１、２１：偏光板
１２、１３、２２、２３：１／２波長の位相差を与える
複屈折層
１４、２４：１／４波長の位相差を与える複屈折層
３：液晶セル1, 2: Circularly polarizing plates 11 and 21 composed of a pair of left and right rotating plates, 21: Polarizing plates 12, 13, 22, 23: Birefringent layer 14 for giving a phase difference of ½ wavelength, 24: Position of ¼ wavelength Birefringent layer 3 for giving a phase difference: liquid crystal cell
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H049 BA02 BA03 BA06 BA07 BA42 BB03 BB33 BB42 BB44 BC03 BC22 2H091 FA08 FA11 FB03 FB13 LA03 LA11 LA12 LA16 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 2H049 BA02 BA03 BA06 BA07 BA42 BB03 BB33 BB42 BB44 BC03 BC22 2H091 FA08 FA11 FB03 FB13 LA03 LA11 LA12 LA16
Claims (3)
の一対の円偏光板からなり、その各円偏光板は、偏光板
と１／４波長の位相差を与える複屈折層との間に、１／
２波長の位相差を与える複屈折層の１層又は２層以上を
前記１／４波長の位相差を与える複屈折層に対して光軸
が交差する状態で有して、その複数の複屈折層が総和で
２００〜１０００nmの波長域の全部又は一部で１／４波
長の位相差を与えるものであり、前記一対の円偏光板を
その偏光板を外側にして対向配置した場合における一対
の円偏光板間における関係において、複屈折層を偏光板
に近い側より第１層、第２層・・・第ｎ層としたとき、
その第１層同士、第２層同士・・・第ｎ層同士の進相軸
及び偏光板同士の透過軸の交差角が８０〜１００度の範
囲内にあることを特徴とする左右回り一対の円偏光板。1. A pair of left-handed and right-handed circularly polarizing plates having the same number of birefringent layers, each of the circularly polarizing plates is provided with a birefringent layer that gives a phase difference of ¼ wavelength. In between, 1 /
A plurality of birefringent layers having one or two or more birefringent layers for providing a phase difference of two wavelengths with their optical axes intersecting the birefringent layer for providing a phase difference of a quarter wavelength. A layer gives a quarter-wave retardation in all or part of the wavelength range of 200 to 1000 nm in total, and a pair of circular polarizing plates are arranged opposite to each other with the polarizing plates facing outward. In the relationship between the circularly polarizing plates, when the birefringent layer is the first layer, the second layer ... The nth layer from the side closer to the polarizing plate,
The first layer, the second layer, ... The pair of right and left rotating pairs, characterized in that the crossing angles of the fast axes of the nth layers and the transmission axes of the polarizing plates are in the range of 80 to 100 degrees. Circular polarizing plate.
３３nmの光に基づく光弾性係数が５×１０−１１ｍ２／
Ｎ以下である左右回り一対の円偏光板。2. The wavelength 6 of each birefringent layer according to claim 1.
The photoelastic coefficient based on 33 nm light is 5 × 10 −11 m 2 /
A pair of left and right circularly polarizing plates that are N or less.
円偏光板をその偏光板を外側にして液晶セルの両側に分
配配置してなり、その両側における円偏光板間の関係に
おいて、各円偏光板における複屈折層を偏光板に近い側
より第１層、第２層・・・第ｎ層としたとき、その第１
層同士、第２層同士・・・第ｎ層同士の進相軸及び偏光
板同士の透過軸の交差角が８０〜１００度の範囲内にあ
ることを特徴とする液晶表示装置。3. A pair of left and right circularly polarizing plates according to claim 1 or 2 are distributed and arranged on both sides of a liquid crystal cell with the polarizing plates being outside, and in the relationship between the circularly polarizing plates on both sides, When the birefringent layer in each circularly polarizing plate is the first layer, the second layer, ...
A liquid crystal display device, wherein the crossing angles of the fast axes of the n-th layers and the transmission axes of the polarizing plates are in the range of 80 to 100 degrees.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001216147A JP2003029039A (en) | 2001-07-17 | 2001-07-17 | Circularly polarizing plate and liquid crystal display device |
| KR1020020041694A KR100645664B1 (en) | 2001-07-17 | 2002-07-16 | Circularly polarizing plate and liquid-crystal display device |
| CNB021268770A CN1266497C (en) | 2001-07-17 | 2002-07-17 | Circular polarizing disk and liquid crystal display |
| TW091115924A TW581887B (en) | 2001-07-17 | 2002-07-17 | Circularly polarizing plate and liquid-crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001216147A JP2003029039A (en) | 2001-07-17 | 2001-07-17 | Circularly polarizing plate and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003029039A true JP2003029039A (en) | 2003-01-29 |
Family
ID=19050659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001216147A Pending JP2003029039A (en) | 2001-07-17 | 2001-07-17 | Circularly polarizing plate and liquid crystal display device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2003029039A (en) |
| KR (1) | KR100645664B1 (en) |
| CN (1) | CN1266497C (en) |
| TW (1) | TW581887B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005088362A1 (en) * | 2004-03-11 | 2005-09-22 | Fuji Photo Film Co., Ltd. | Optical compensatory element, manufacturing method thereof, liquid crystal display and liquid crystal projector |
| JP2007102016A (en) * | 2005-10-06 | 2007-04-19 | Tohoku Univ | Polarizing element, liquid crystal panel, and liquid crystal display device |
| JP2017138401A (en) * | 2016-02-02 | 2017-08-10 | 大日本印刷株式会社 | Optical film and image display device |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410787C (en) * | 2003-03-14 | 2008-08-13 | 奇美电子股份有限公司 | Vertical nematic LCD device with multiple display zones by circular polarized light |
| JP4131838B2 (en) | 2003-05-16 | 2008-08-13 | 株式会社半導体エネルギー研究所 | Display device |
| TWI240119B (en) * | 2003-08-06 | 2005-09-21 | Optimax Tech Corp | Polarizer for multi-domain vertical alignment liquid crystal display |
| CN100338512C (en) * | 2003-09-11 | 2007-09-19 | 力特光电科技股份有限公司 | Polarizer of multi-domain vertical alignment LCD |
| JP4485184B2 (en) | 2003-12-15 | 2010-06-16 | 株式会社半導体エネルギー研究所 | LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE |
| JP4228973B2 (en) * | 2004-04-08 | 2009-02-25 | セイコーエプソン株式会社 | Liquid crystal display device and electronic device |
| JP4350052B2 (en) * | 2004-04-16 | 2009-10-21 | シャープ株式会社 | Circularly polarizing plate and liquid crystal display device |
| CN101065702B (en) * | 2004-11-24 | 2010-09-08 | 皇家飞利浦电子股份有限公司 | Display device |
| CN100406928C (en) * | 2005-02-25 | 2008-07-30 | 日东电工株式会社 | Method for manufacturing elliptically polarizing plate and image display device using the elliptically polarizing plate |
| JP2007004123A (en) | 2005-05-25 | 2007-01-11 | Nitto Denko Corp | Optical film, liquid crystal panel and liquid crystal display device |
| CN100410699C (en) * | 2005-05-25 | 2008-08-13 | 日东电工株式会社 | Optical film, liquid crystal panel, and liquid crystal display apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05100114A (en) * | 1991-10-07 | 1993-04-23 | Nitto Denko Corp | Laminated wavelength plate and circularly polarizing plate |
| JP2000035570A (en) * | 1998-07-16 | 2000-02-02 | Sharp Corp | Liquid crystal display device |
-
2001
- 2001-07-17 JP JP2001216147A patent/JP2003029039A/en active Pending
-
2002
- 2002-07-16 KR KR1020020041694A patent/KR100645664B1/en not_active IP Right Cessation
- 2002-07-17 CN CNB021268770A patent/CN1266497C/en not_active Expired - Fee Related
- 2002-07-17 TW TW091115924A patent/TW581887B/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05100114A (en) * | 1991-10-07 | 1993-04-23 | Nitto Denko Corp | Laminated wavelength plate and circularly polarizing plate |
| JP2000035570A (en) * | 1998-07-16 | 2000-02-02 | Sharp Corp | Liquid crystal display device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005088362A1 (en) * | 2004-03-11 | 2005-09-22 | Fuji Photo Film Co., Ltd. | Optical compensatory element, manufacturing method thereof, liquid crystal display and liquid crystal projector |
| JP2007102016A (en) * | 2005-10-06 | 2007-04-19 | Tohoku Univ | Polarizing element, liquid crystal panel, and liquid crystal display device |
| JP4731269B2 (en) * | 2005-10-06 | 2011-07-20 | 国立大学法人東北大学 | Polarizing element, liquid crystal panel, and liquid crystal display device |
| JP2017138401A (en) * | 2016-02-02 | 2017-08-10 | 大日本印刷株式会社 | Optical film and image display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1397809A (en) | 2003-02-19 |
| TW581887B (en) | 2004-04-01 |
| KR20030007215A (en) | 2003-01-23 |
| CN1266497C (en) | 2006-07-26 |
| KR100645664B1 (en) | 2006-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7586569B2 (en) | IPS mode liquid crystal display | |
| KR100822247B1 (en) | Optical film and display system | |
| JP3928842B2 (en) | Polarizing plate and display device | |
| JP2017010034A (en) | Polarizing plate | |
| JP2003029038A (en) | Optical film, polarizing plate and display device | |
| JP2001042127A (en) | Composite phase difference plate, optical compensation polarizing plate and liquid crystal display device | |
| JP2000227520A (en) | Phase difference plate, laminated polarizing plate and liquid crystal display device | |
| JP2002258041A (en) | Optical compensation polarizing plate and liquid crystal display | |
| JP2003121644A (en) | Polarizer and liquid crystal display element | |
| TWI244558B (en) | Optical film and image display | |
| JP2003029039A (en) | Circularly polarizing plate and liquid crystal display device | |
| KR102060795B1 (en) | Anti-reflection layer and anti-mirroring layer-attached polarizing plate and manufacturing method thereof | |
| KR20180057586A (en) | Polarizing plate and image display device including the same | |
| JP2003344856A (en) | Liquid crystal display device and optical retardation thin film and laminated polarizing plate to be used for the same | |
| KR100641523B1 (en) | Optical sheet, polarizer and liquid-crystal display device | |
| JP3923682B2 (en) | Composite retardation plate, optical compensation polarizing plate, and liquid crystal display device | |
| KR100710966B1 (en) | Optical sheet, polarizer and liquid-crystal display device | |
| US6710830B2 (en) | Optical sheet, polarizer and liquid-crystal display device | |
| US9618795B2 (en) | Liquid crystal panel and liquid crystal display | |
| JP2001147323A (en) | Laminated phase difference plate, elliptically polarizing plate and liquid crystal display device | |
| JP2002277633A (en) | Optical film, polarizing plate and liquid crystal display | |
| JP2003075635A (en) | Optical film, polarizing plate and display device | |
| JP4401511B2 (en) | Composite retardation plate, optical compensation polarizing plate, and liquid crystal display device | |
| JP2001166133A (en) | Optically compensated polarizing plate and liquid crystal display device | |
| JP2001166134A (en) | Phase difference plate, optically compensated polarizing plate and liquid crystal display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20071113 |
|
| RD03 | Notification of appointment of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7423 Effective date: 20090204 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20100323 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20100413 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20100609 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20100624 |