JPH04113301A - New optical sheet and liquid crystal display device using same sheet - Google Patents
New optical sheet and liquid crystal display device using same sheetInfo
- Publication number
- JPH04113301A JPH04113301A JP2230624A JP23062490A JPH04113301A JP H04113301 A JPH04113301 A JP H04113301A JP 2230624 A JP2230624 A JP 2230624A JP 23062490 A JP23062490 A JP 23062490A JP H04113301 A JPH04113301 A JP H04113301A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- liquid crystal
- present
- crystal display
- display device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 19
- 230000003287 optical effect Effects 0.000 title claims description 20
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 12
- 239000000057 synthetic resin Substances 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims description 10
- 238000004040 coloring Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 229920000515 polycarbonate Polymers 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 210000002858 crystal cell Anatomy 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 229920006038 crystalline resin Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical compound ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- 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
- 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
- G02F2413/10—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 with refractive index ellipsoid inclined, or tilted, relative to the LC-layer surface O plate
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、位相差補償シートとして良好に使用できる、
特異な複屈折特性を有する異方性配向シート及びこれを
用いた液晶表示装置に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention can be used favorably as a retardation compensating sheet.
The present invention relates to an anisotropic alignment sheet having unique birefringence properties and a liquid crystal display device using the same.
Ｓ Ｔ Ｎ （Ｓｕｐｅｒ Ｔｗｉｓｔｅｄ Ｎｅｍａ
ｔｉｃ）液晶デイスプレィにおいて白黒表示を実現する
ためには、ＳＴＮ液晶の複屈折性による着色を除く必要
性がある。S T N (Super Twisted Nema)
tic) In order to realize black and white display in a liquid crystal display, it is necessary to remove coloration due to birefringence of STN liquid crystal.
この方法として、光学補償用の液晶セルをさらに重ねて
液晶の着色を消す２層セル方式が実用化されているが、
光学補償用液晶セルは高価であり、また装置が厚く重く
なり、光線の透過率が低下し、より強い光源を必要とす
るなどの欠点を有する。As a method for this, a two-layer cell system has been put into practical use that eliminates the coloring of the liquid crystal by layering an additional layer of liquid crystal cells for optical compensation.
Liquid crystal cells for optical compensation are expensive, have drawbacks such as thick and heavy devices, reduced light transmittance, and require a stronger light source.
この様な２層セル方式の欠点を解決する方法として、光
学補償用の液晶セルと同等の光学的特性をもった高分子
シートで置き換える方法があるが、この様な光学特性を
もった高分子シート（以後、位相差補償シートと呼ぶ）
は、液晶に合わせた複屈折特性を持ち透明度の高いシー
トであることが必要である。One way to solve these drawbacks of the two-layer cell system is to replace it with a polymer sheet that has the same optical properties as the liquid crystal cell for optical compensation. Sheet (hereinafter referred to as phase difference compensation sheet)
The sheet needs to have birefringence characteristics matching the liquid crystal and be highly transparent.
更に、最近、液晶表示（以後ＬＣＤと略称）を斜めから
見た場合の見易すさ、すなわち、斜めから見た時の表示
の着色、コントラスト比が問題になっており、視野角が
広いことが要求されている。Furthermore, recently, the ease of viewing liquid crystal displays (hereinafter abbreviated as LCD) when viewed from an angle has become a problem, in other words, the coloring and contrast ratio of the display when viewed from an angle have become a problem, and the wide viewing angle has become a problem. requested.
ＳＴＮ液晶に１枚の位相差補償シートを用いた場合、視
野角依存性を含めてその位相差補償シートに要求される
好ましいレターデーション値（以後Ｒ値、あるいは△ｎ
−ｄと略称する）について、１９９０年春季、第３７回
応用物理学会、３Ｑａ−Ｄ −１０で報告された。When one retardation compensation sheet is used in an STN liquid crystal, the preferred retardation value (hereinafter referred to as R value or △n
-d) was reported at the 37th Japan Society of Applied Physics, 3Qa-D-10, Spring 1990.
すなわち、該報告によれば第３図に示す様に、同一場所
を視角を変えて見た場合、各視角に要求されるＲ値は対
称では無い。第３図（３−１）に於て、位相差補償シー
ト１のある点２を、視角を傾き角度θ、周方向角度φと
変えて見た場合、該シート１に要求されるＲ値をｎｍ単
位で○印の中に示されている（３−２）。That is, according to the report, as shown in FIG. 3, when the same place is viewed from different viewing angles, the R values required for each viewing angle are not symmetrical. In Fig. 3 (3-1), when a certain point 2 of the retardation compensating sheet 1 is viewed with the viewing angle changed to the inclination angle θ and the circumferential direction angle φ, the R value required for the sheet 1 is calculated. It is shown inside the circle in nm units (3-2).
この様な複雑なＲ値を持つ位相シートは、これまで一般
に使用されている位相シートでは困難であり、単なる１
軸延伸シート、あるいは２軸延伸シートでは困難であり
、より改良された位相差補償シートが要求されている。It is difficult to create a phase sheet with such a complex R value using the phase sheets that have been commonly used.
This is difficult to achieve with an axially stretched sheet or a biaxially stretched sheet, and a more improved retardation compensating sheet is required.
本発明は、従来の１軸延伸シーＩ・あるいは２軸延伸シ
ートの様に、シート面の垂直線に対しである角度を持っ
て位相シートを見た時のＲ値が垂直線を中心として対称
な値ではなく、非対称となったＲ値を有し、５ＴＮ−Ｌ
Ｃ等に最も好ましい位相シートを提供するものである。The present invention, like the conventional uniaxially stretched sheet I or biaxially stretched sheet, has an R value that is symmetrical about the vertical line when the phase sheet is viewed at a certain angle with respect to the vertical line of the sheet surface. 5TN-L has an asymmetrical R value rather than a
This provides the most preferable phase sheet for C and the like.
〔課題を解決するための手段及び作用］本発明は上記課
題を解決するものである。[Means and effects for solving the problems] The present invention solves the above problems.
すなわち本発明は透明な合成樹脂シー１〜からなり、該
合成樹脂の高分子鎖の平均配向方向がシー１〜面方向と
平行ではなく、ある角度をもって配向されている新規な
光学シートであり、更に本発明は該光学シートを含む液
晶表示装置である。That is, the present invention is a novel optical sheet consisting of a transparent synthetic resin sheet 1, in which the average orientation direction of the polymer chains of the synthetic resin is not parallel to the surface direction of the sheet 1, but is oriented at a certain angle, Furthermore, the present invention is a liquid crystal display device including the optical sheet.
本発明で用いる合成樹脂は、透明性に優れた合成樹脂で
、非結晶性樹脂では、例えばメタクリル樹脂、ポリスチ
レン、スチレン−アクリロニトリル共重合体（以下ｒＡ
ｓＪという）、ポリカーボネート、非品性ポリオレフィ
ン等が使用できる。The synthetic resin used in the present invention is a synthetic resin with excellent transparency, and examples of non-crystalline resins include methacrylic resin, polystyrene, and styrene-acrylonitrile copolymer (rA
sJ), polycarbonate, non-grade polyolefin, etc. can be used.
ポリカーボネートとしては、ビスフェノールＡから合成
される芳香族ポリカーボネートが適している。結晶性樹
脂では、ポリフッ化ビニリデン、ポリプロピレン、ポリ
エチレン等が使用できる。As the polycarbonate, aromatic polycarbonate synthesized from bisphenol A is suitable. As the crystalline resin, polyvinylidene fluoride, polypropylene, polyethylene, etc. can be used.
合成樹脂シートを一般に１軸延伸あるいは２軸延伸する
と、合成樹脂の高分子鎖は延伸方向に配向し、高分子鎖
はシート面方向と平行に配向する。When a synthetic resin sheet is generally uniaxially or biaxially stretched, the polymer chains of the synthetic resin are oriented in the stretching direction, and the polymer chains are oriented parallel to the sheet surface direction.
この場合、全ての高分子鎖がシート面方向と平行に配向
するのではなく、各方向を向いた高分子鎖を平均すると
、シート面方向と平行方向に配向しており、これを平均
配向方向とよぶことにする。In this case, all the polymer chains are not oriented parallel to the sheet surface direction, but the polymer chains oriented in each direction are averaged to be oriented parallel to the sheet surface direction, and this is the average orientation direction. I will call it.
本発明のシートは高分子鎖の平均配向方向がシト面方向
と平行ではなく、ある角度をもって配向されている。In the sheet of the present invention, the average orientation direction of the polymer chains is not parallel to the sheet surface direction, but is oriented at a certain angle.
本発明のシートを第１図で説明する。第１図に於て、シ
ート３を構成する高分子鎖の平均配向方向は４で示す方
向を向いている。すなわち、シート面方向とα度傾いて
いる。該シート３をシート面に垂直な方向５からのＲ値
、垂直方向５からθ度斜め方向の、６と７からのＲ値は
、全て異なった値を示す。The sheet of the present invention will be explained with reference to FIG. In FIG. 1, the average orientation direction of the polymer chains constituting the sheet 3 is in the direction indicated by 4. That is, it is tilted by α degrees with respect to the sheet surface direction. The R value of the sheet 3 in the direction 5 perpendicular to the sheet surface, and the R values in directions 6 and 7 diagonal by θ degrees from the perpendicular direction 5 all show different values.
これに対し、第２図に示す一般の延伸シート８は、高分
子鎖の平均配向方向はシート面と平行方向９であり、該
シート面に垂直な方向１０からのＲ値、垂直方向１０か
らθ度傾いた１１と１２からのＲ値は、１１と１２が等
しい値となる。従来シートの各角度によるＲ（Ｊの変化
は該シートの樹脂の種類、１軸延伸又は２軸延伸、延伸
倍率等により異なるが、垂直方向１０を中心として対称
のＲ（Ｉ！となる。On the other hand, in the general stretched sheet 8 shown in FIG. The R value from 11 and 12 tilted by θ degrees is the same value for 11 and 12. The change in R(J) due to each angle of the conventional sheet varies depending on the type of resin of the sheet, uniaxial or biaxial stretching, stretching ratio, etc., but it becomes symmetrical R(I!) with respect to the vertical direction 10.
これに対して第１図に示す本発明シートでは、各角度に
よるＲ値の変化は垂直方向５を中心として対称のＲ値に
ならない。 本発明シートの各方向からのＲ値は、樹脂
の種類ｌ軸延伸又は２軸延伸、延伸倍率、平均配向方向
の傾き角度α等により異なる。これ等Ｒ値を左右する要
因を適度に選択することにより、第（３−２）図に示す
Ｒ値に近いＲ値分布を有する位相シートを得ることがで
きる。On the other hand, in the sheet of the present invention shown in FIG. 1, the change in R value due to each angle does not become symmetrical with respect to the vertical direction 5. The R value in each direction of the sheet of the present invention differs depending on the type of resin, l-axis stretching or biaxial stretching, stretching ratio, inclination angle α of the average orientation direction, etc. By appropriately selecting these factors that influence the R value, it is possible to obtain a phase sheet having an R value distribution close to the R value shown in FIG. 3-2.
本発明に述べる光学シートの厚みは一般に使用されるシ
ートあるいはフィルムの厚みであり、好ましくは１０μ
ｍから１０００μｍ、更に好ましくは５０μｍから５０
０μｍである。The thickness of the optical sheet described in the present invention is the thickness of a commonly used sheet or film, and is preferably 10 μm.
m to 1000 μm, more preferably 50 μm to 50
It is 0 μm.
本発明に述べる、ある角度とは、平均配向方向とシート
面方向との角度が、本発明シート内で検知し得る角度で
存在することであり、好ましくは１０度から８０度の範
囲から選択される。In the present invention, a certain angle means that the angle between the average orientation direction and the sheet surface direction exists at an angle that can be detected within the sheet of the present invention, and is preferably selected from the range of 10 degrees to 80 degrees. Ru.
本発明の光学シートは種々の方法で成形できるが、最も
好ましい方法は、透明な合成樹脂の１軸配向あるいは２
軸配向された成形品の切削等により成形できる。しかし
１本発明の光学シートは上記成形法に限定されるもので
はない。The optical sheet of the present invention can be molded by various methods, but the most preferred method is uniaxial or biaxial orientation of transparent synthetic resin.
It can be molded by cutting an axially oriented molded product. However, the optical sheet of the present invention is not limited to the above molding method.
本発明の光学シートの成形法の具体例を第４図〜第７図
を用いて説明する。A specific example of the method for molding the optical sheet of the present invention will be described with reference to FIGS. 4 to 7.
第４図に於て、１軸延伸あるいは２軸延伸されたシート
１３を積層、接着した成形体１４を切削して本発明シー
トを得る。積層成形体１４の高分子鎖は１５で示すシー
ト面方向に平均配向方向があり、これを該平均配向方向
１５と異なる、好ましくは１０〜８０度の異なる角度の
方向１６にスライスして本発明シート１７を得る。In FIG. 4, a molded body 14 in which monoaxially or biaxially stretched sheets 13 are laminated and bonded is cut to obtain a sheet of the present invention. The polymer chains of the laminate molded product 14 have an average orientation direction in the sheet surface direction indicated by 15, and this is sliced into a direction 16 different from the average orientation direction 15, preferably at a different angle of 10 to 80 degrees to obtain the present invention. Sheet 17 is obtained.
第５図に於て、１軸延伸あるいは２軸延伸されたシート
１８を積層、接着した成形体１９においては該成形体の
平均配向方向は２０の矢印で示す面上にある（５−１）
の該成形体１９を（５−２）に示す様にθ度変形させ、
θ度変形させた成形体２１を２０で示す方向と垂直方向
２２にスライスして本発明シート２３を得る。In FIG. 5, in a molded body 19 made by laminating and bonding uniaxially or biaxially stretched sheets 18, the average orientation direction of the molded body is on the plane indicated by the arrow 20 (5-1)
The molded body 19 is deformed by θ degrees as shown in (5-2),
The molded body 21 deformed by θ degrees is sliced in a direction 22 perpendicular to the direction indicated by 20 to obtain a sheet 23 of the present invention.
第６図に於て、透明合成樹脂の円柱状予備成形品２４を
成形しく６−１）、該予備成形品２４を特開昭５６−３
０８０９号公報等で示される圧縮延伸法等の方法で、圧
延二輪延伸しく６−２Ｌ得られた円盤状二輪延伸成形品
２５を積層、接着して円柱状型物２７とする（６−３Ｌ
該円柱状型物２７は円柱の上部平面方向と平行方向２６
に平均配向方向がある。該円柱状型物２７の中心に固型
物２８を入れ（６−４Ｌ該固型物２８を加圧駆動して円
柱状型物２７を変形させる（６−５）、該変形された円
柱状型物２９の平均配向方向３０は変形前の円柱状型物
の平均配向方向とはθ度の傾きがある。該変形円柱状型
物２９を固型物２８を中心として回転させ、表面をスラ
イスして本発明のシート３１を得る（６−６）。In FIG. 6, a cylindrical preformed product 24 of transparent synthetic resin is molded (6-1), and the preformed product 24 is
By a method such as the compression stretching method shown in Publication No. 0809, etc., the disc-shaped two-wheel stretched molded product 25 obtained by rolling two-wheeled 6-2L is laminated and bonded to form a cylindrical molded product 27 (6-3L
The cylindrical molded object 27 is arranged in a direction 26 parallel to the upper plane direction of the cylinder.
has an average orientation direction. A solid object 28 is placed in the center of the cylindrical object 27 (6-4L) The solid object 28 is pressed and driven to deform the cylindrical object 27 (6-5), and the deformed cylindrical object 27 is The average orientation direction 30 of the mold 29 has an inclination of θ degrees from the average orientation direction of the cylindrical mold before deformation.The deformed cylindrical mold 29 is rotated around the solid object 28, and the surface is sliced. Then, the sheet 31 of the present invention is obtained (6-6).
第７図に於て、第６図（６−４）の円柱状型物をスライ
スして得た、平均配向方向がシート面と垂直方向３４に
存在するシート３２を、回転速度が異なる２個の圧延ロ
ール３３．３４で延伸して本発明のシート３５を得る。In FIG. 7, the sheets 32 obtained by slicing the cylindrical molded article in FIG. The sheet 35 of the present invention is obtained by stretching with rolling rolls 33 and 34.
該本発明シート３５の平均配向方向３６は、シート面と
垂直方向３４とθ度傾いている。The average orientation direction 36 of the sheet 35 of the present invention is inclined by θ degrees with respect to the direction 34 perpendicular to the sheet surface.
第４図〜第７図に示した本発明の光学シートの製法は、
１軸配向あるいは２軸配向された成形品のスライス工程
を経るため、合成樹脂はスライスし易い樹脂が好ましく
、例えば、ポリプロピレン、ポリエチレン、ポリフッ化
ビニリデン、ポリカーボネート、非品性ポリオレフィン
にッケイニューマテリアル、１９９０年５月７日号、第
６５頁等に記載の非品性ポリオレフィン等）等が良好に
使用できる。The manufacturing method of the optical sheet of the present invention shown in FIGS. 4 to 7 is as follows:
Since the uniaxially or biaxially oriented molded product undergoes a slicing process, the synthetic resin is preferably a resin that is easy to slice.For example, polypropylene, polyethylene, polyvinylidene fluoride, polycarbonate, non-grade polyolefin, Kkei New Material, etc. Non-quality polyolefins described in May 7, 1990 issue, page 65, etc.) can be used satisfactorily.
本発明の光学シートは液晶表示装置の位相差補償フィル
ムとして良好に使用される。特に５ＴＮＬＣＤには良好
に使用できる。第７図を用いて説明する。The optical sheet of the present invention can be favorably used as a retardation compensation film for liquid crystal display devices. It can be used particularly well for 5TN LCD. This will be explained using FIG.
一般のＳＴＮ液晶−ＬＣＤは、第８図に示される、光源
ユニット３７、偏光フィルム３８．５ＴＮＬＣＤユニツ
ト３９及び偏光フィルム４０から基本的に構成されてい
る。A general STN liquid crystal-LCD basically consists of a light source unit 37, a polarizing film 38.5, a TNLCD unit 39, and a polarizing film 40, as shown in FIG.
上記５ＴＮ−ＬＣＤではＳＴＮ液晶が光の波長により屈
折率が異なるため、直線偏光がＳＴＮ液晶で楕円偏光に
なる。この楕円偏光を直線偏光にすべ（、従来位相差補
償シー目１が使用されている。In the 5TN-LCD described above, since the STN liquid crystal has a different refractive index depending on the wavelength of light, linearly polarized light becomes elliptically polarized light in the STN liquid crystal. To convert this elliptically polarized light into linearly polarized light, a phase difference compensation seam 1 is conventionally used.
従来の位相差補償シートは第２図に示した様な構造を持
っており、既に述べた様に問題をか＼えている。本発明
は、本発明に述べる光学シートをこの位相差補償シート
に使用するものである。The conventional phase difference compensating sheet has a structure as shown in FIG. 2, and as mentioned above, it poses problems. The present invention uses the optical sheet described in the present invention as this retardation compensation sheet.
本発明は、以上説明した通りのものであり、本発明の光
学シートを、例えばＳＴＮ液晶を用いたＬＣＤに用いる
ことにより、ＬＣＤを真正面から見た場合と、斜めから
見た場合の差が少なくなり、表示の着色の減少、コント
ラスト比の向上等が得られ、よりＬＣＤが見やすくなる
ものである。The present invention is as explained above, and by using the optical sheet of the present invention in, for example, an LCD using STN liquid crystal, there is little difference between when the LCD is viewed from the front and when viewed from an angle. As a result, display coloration is reduced, contrast ratio is improved, and the LCD becomes easier to see.
第１図は本発明の位相差補償シートのＲ値が、視野角に
より異なることを示す説明図。
第２図は従来の光学シートの説明図、
第３図は５ＴＮ−ＬＣの位相差補償シートに要求される
好ましいＲ値を示す説明図、
第４図〜第７図は本発明の光学シートの製法を示す説明
図、
第８図は本発明の光学シートの使用例を示す説明図であ
る。FIG. 1 is an explanatory diagram showing that the R value of the retardation compensation sheet of the present invention differs depending on the viewing angle. Fig. 2 is an explanatory diagram of a conventional optical sheet, Fig. 3 is an explanatory diagram showing a preferable R value required for a 5TN-LC retardation compensation sheet, and Figs. 4 to 7 are an explanatory diagram of the optical sheet of the present invention. FIG. 8 is an explanatory diagram showing an example of the use of the optical sheet of the present invention.
Claims (1)
分子鎖の平均配向方向がシート面方向と平行ではなく、
ある角度をもって配向された光学シート。 ２、請求項１に記載の光学シートを有する液晶表示装置
。[Claims] 1. A sheet made of a transparent synthetic resin, wherein the average orientation direction of the polymer chains of the synthetic resin is not parallel to the sheet surface direction;
Optical sheet oriented at a certain angle. 2. A liquid crystal display device comprising the optical sheet according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2230624A JPH04113301A (en) | 1990-09-03 | 1990-09-03 | New optical sheet and liquid crystal display device using same sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2230624A JPH04113301A (en) | 1990-09-03 | 1990-09-03 | New optical sheet and liquid crystal display device using same sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04113301A true JPH04113301A (en) | 1992-04-14 |
Family
ID=16910695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2230624A Pending JPH04113301A (en) | 1990-09-03 | 1990-09-03 | New optical sheet and liquid crystal display device using same sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04113301A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5375006A (en) * | 1992-06-26 | 1994-12-20 | Thomson Consumer Electronics S.A. | Twisted nematic liquid crystal display devices with optical axis of birefringent layer inclined with respect to birefringent layer normal |
| EP0650079A1 (en) * | 1993-10-22 | 1995-04-26 | Fuji Photo Film Co., Ltd. | Optical compensatory sheet and liquid crystal display having the same |
| JPH0827284A (en) * | 1994-05-13 | 1996-01-30 | Fuji Photo Film Co Ltd | Production of thin film, optically anisotropic sheet and liquid crystal display device |
| US5506706A (en) * | 1992-06-26 | 1996-04-09 | Sharp Kabushiki Kaisha | Liquid crystal display device having a phase difference plate with one refractive index at an angle to the surface normal |
| US5583677A (en) * | 1993-01-18 | 1996-12-10 | Fuji Photo Film Co., Ltd. | Optical compensation sheet and its fabrication as well as liquid crystal display device using the same |
| US5699136A (en) * | 1992-11-18 | 1997-12-16 | Fuji Photo Film Co., Ltd. | Negative uniaxial anisotropic element and method for manufacturing the same |
| US5986734A (en) * | 1994-04-04 | 1999-11-16 | Rockwell International Corporation | Organic polymer O-plate compensator for improved gray scale performance in twisted nematic liquid crystal displays |
| US6208396B1 (en) | 1996-10-25 | 2001-03-27 | Sumitomo Chemical Company, Limited | Normally white mode twisted nematic liquid crystal display device having improved viewing angle characteristics |
| EP1077387A3 (en) * | 1999-07-27 | 2003-01-29 | Sony Corporation | Liquid crystal projector |
| JP2004038148A (en) * | 2002-04-12 | 2004-02-05 | Eastman Kodak Co | Bend-alignment nematic liquid crystal picture display having compensating film |
-
1990
- 1990-09-03 JP JP2230624A patent/JPH04113301A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1103839A2 (en) * | 1992-06-26 | 2001-05-30 | Thomson Consumer Electronics, Inc. | Twisted nematic liquid crystal display device |
| US5375006A (en) * | 1992-06-26 | 1994-12-20 | Thomson Consumer Electronics S.A. | Twisted nematic liquid crystal display devices with optical axis of birefringent layer inclined with respect to birefringent layer normal |
| US5506706A (en) * | 1992-06-26 | 1996-04-09 | Sharp Kabushiki Kaisha | Liquid crystal display device having a phase difference plate with one refractive index at an angle to the surface normal |
| EP1103839A3 (en) * | 1992-06-26 | 2001-08-22 | THOMSON multimedia | Twisted nematic liquid crystal display device |
| US5699136A (en) * | 1992-11-18 | 1997-12-16 | Fuji Photo Film Co., Ltd. | Negative uniaxial anisotropic element and method for manufacturing the same |
| US5583677A (en) * | 1993-01-18 | 1996-12-10 | Fuji Photo Film Co., Ltd. | Optical compensation sheet and its fabrication as well as liquid crystal display device using the same |
| US5559618A (en) * | 1993-10-22 | 1996-09-24 | Fuji Photo Film Co., Ltd. | Liquid crystal compensator satisfying nx>nz>ny having ny and nz inclined |
| EP0650079A1 (en) * | 1993-10-22 | 1995-04-26 | Fuji Photo Film Co., Ltd. | Optical compensatory sheet and liquid crystal display having the same |
| US5986734A (en) * | 1994-04-04 | 1999-11-16 | Rockwell International Corporation | Organic polymer O-plate compensator for improved gray scale performance in twisted nematic liquid crystal displays |
| US6320634B1 (en) | 1994-04-04 | 2001-11-20 | Rockwell International Corporation | Organic polymer O-plate compensator for improved gray scale performance in twisted nematic liquid crystal displays |
| JPH0827284A (en) * | 1994-05-13 | 1996-01-30 | Fuji Photo Film Co Ltd | Production of thin film, optically anisotropic sheet and liquid crystal display device |
| US6208396B1 (en) | 1996-10-25 | 2001-03-27 | Sumitomo Chemical Company, Limited | Normally white mode twisted nematic liquid crystal display device having improved viewing angle characteristics |
| EP1077387A3 (en) * | 1999-07-27 | 2003-01-29 | Sony Corporation | Liquid crystal projector |
| JP2004038148A (en) * | 2002-04-12 | 2004-02-05 | Eastman Kodak Co | Bend-alignment nematic liquid crystal picture display having compensating film |
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