JP2000019325A - 1/4 wavelength plate - Google Patents
1/4 wavelength plateInfo
- Publication number
- JP2000019325A JP2000019325A JP10187450A JP18745098A JP2000019325A JP 2000019325 A JP2000019325 A JP 2000019325A JP 10187450 A JP10187450 A JP 10187450A JP 18745098 A JP18745098 A JP 18745098A JP 2000019325 A JP2000019325 A JP 2000019325A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- light
- quarter
- wave plate
- wavelength
- 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
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- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 1
- PIZHFBODNLEQBL-UHFFFAOYSA-N 2,2-diethoxy-1-phenylethanone Chemical compound CCOC(OCC)C(=O)C1=CC=CC=C1 PIZHFBODNLEQBL-UHFFFAOYSA-N 0.000 description 1
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- FDSUVTROAWLVJA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol;prop-2-enoic acid Chemical compound OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OCC(CO)(CO)COCC(CO)(CO)CO FDSUVTROAWLVJA-UHFFFAOYSA-N 0.000 description 1
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- RSROEZYGRKHVMN-UHFFFAOYSA-N 2-ethyl-2-(hydroxymethyl)propane-1,3-diol;oxirane Chemical compound C1CO1.CCC(CO)(CO)CO RSROEZYGRKHVMN-UHFFFAOYSA-N 0.000 description 1
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- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
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- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
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- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
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- 239000003999 initiator Substances 0.000 description 1
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- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
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- 125000002816 methylsulfanyl group Chemical group [H]C([H])([H])S[*] 0.000 description 1
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
- Polarising Elements (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は液晶表示装置の分野
において、偏光反射板を用いた偏光性のバックライトシ
ステム等に好適に用いることができる1/4波長板に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quarter-wave plate which can be suitably used in a polarizing backlight system using a polarizing reflector in the field of liquid crystal display devices.
【0002】[0002]
【従来の技術】近年パソコン、テレビ、計測器等のモニ
ター等の用途に広く用いられている液晶表示装置には現
在、主として光の偏光状態のスイッチングにより明暗の
表示を行う方式、代表的にはTNモード、STNモード
等の表示方式が用いられている。2. Description of the Related Art In recent years, a liquid crystal display device widely used for applications such as monitors of personal computers, televisions, measuring instruments, etc., currently employs a method of displaying light and dark by switching the polarization state of light. Display methods such as TN mode and STN mode are used.
【0003】これらの表示方式においては多くの場合、
液晶パネル背面に設けられたバックライトからの光をP
VA沃素系等の二色性偏光板により直線偏光にした後、
液晶層に印可する電圧により偏光状態を変調することに
より、明暗の表示もしくは表示色を変化させる方法が取
られている。[0003] In these display systems, in many cases,
The light from the backlight provided on the back of the liquid crystal panel is P
After linearly polarized by a dichroic polarizing plate such as VA iodine,
A method of changing the display state of light or dark or the display color by modulating the polarization state by a voltage applied to the liquid crystal layer has been adopted.
【0004】しかしながら二色性偏光板は光を直線偏光
化する過程で光の偏光成分の一方を吸収するので光の利
用効率が低下してしまうといった欠点があり、最近こう
した光吸収損失を最小限に抑制するための方法がいろい
ろと提案されている。However, the dichroic polarizing plate has a disadvantage in that one of the polarization components of the light is absorbed in the process of linearly polarizing the light, so that the light use efficiency is reduced. Various methods have been proposed for suppressing the above.
【0005】例えば、特表平9−506873号公報や
特表平9−506985号公報等に開示されている一軸
延伸したフィルムと未延伸のフィルムを多層積層してな
る偏光反射板や、特開平6−281814号公報、特開
平10−3079号公報等に開示されているコレステリ
ック高分子液晶層を用いた偏光反射板等により、二色性
偏光板に吸収されてしまう偏光を選択的に反射させ、偏
光軸もしくは回転方向の変化を施す(以下これを「偏光
変換を施す」と記す)ことにより偏光を再利用するとい
った提案が為されている。For example, Japanese Patent Application Laid-Open Nos. 9-506873 and 9-506985 disclose a polarizing reflector comprising a uniaxially stretched film and a non-stretched film in a multilayer structure, and Japanese Patent Application Laid-Open No. No. 6,281,814, Japanese Patent Application Laid-Open No. 10-3079, etc., selectively reflect polarized light that is absorbed by a dichroic polarizing plate using a polarizing reflector using a cholesteric polymer liquid crystal layer. It has been proposed that the polarization is reused by changing the polarization axis or the rotation direction (hereinafter referred to as “performing polarization conversion”).
【0006】[0006]
【発明が解決しようとする課題】このような偏光変換の
具体的方法としては、例えば偏光反射板で反射された一
方の偏光に対して1/2波長に相当する位相差を付与す
ることにより、他方の偏光に変換する方法が変換効率が
高く最も効果的と考えられる。As a specific method of such a polarization conversion, for example, by giving a phase difference corresponding to a half wavelength to one polarized light reflected by a polarizing reflector, It is considered that the method of converting to the other polarized light has the highest conversion efficiency and is most effective.
【0007】具体的に、現在最も広く用いられているエ
ッジライト方式のバックライトを用いた液晶表示装置に
おいて導光板と液晶パネルとの間に偏光反射板を配置す
るような場合を考えると、例えば偏光反射板と導光板と
の間に1/4波長板(光の波長に対して1/4の位相差
を持つ光学板)を配置し、導光板の背面側に光反射板を
配置することにより、偏光反射板で反射した偏光は1/
4波長板と導光板を二度通過(往復)して偏光反射板に
再入射する光路をとることになる。ここで導光板の位相
差(面内位相差)は通常非常に小さいので、偏光には1
/4波長板を往復したことによる1/2波長に相当する
位相差が付与されると予想される。Specifically, in a liquid crystal display device using an edge light type backlight which is currently most widely used, a case where a polarizing reflector is disposed between a light guide plate and a liquid crystal panel is considered. A quarter-wave plate (an optical plate having a phase difference of 1/4 with respect to the wavelength of light) is placed between the polarizing reflector and the light guide plate, and the light reflector is placed behind the light guide plate. As a result, the polarized light reflected by the polarizing reflector is 1 /
An optical path that passes (reciprocates) twice through the four-wavelength plate and the light guide plate and re-enters the polarization reflection plate is taken. Here, the phase difference (in-plane phase difference) of the light guide plate is usually very small.
It is expected that a phase difference corresponding to 波長 wavelength due to reciprocation of the 波長 wavelength plate will be provided.
【0008】このような位相差の付与により、光が直線
偏光である場合には偏光軸の直交する直線偏光に変換さ
れ、円偏光である場合には回転方向が逆の円偏光に変換
されるので、原理的には二色性偏光板の吸収による損失
はゼロとなり、バックライトからの光をほぼ100%利
用することができるはずである。By providing such a phase difference, when the light is linearly polarized light, the light is converted into linearly polarized light having a polarization axis orthogonal thereto, and when the light is circularly polarized light, the light is converted into circularly polarized light having the opposite rotation direction. Therefore, in principle, the loss due to absorption by the dichroic polarizing plate is zero, and almost 100% of the light from the backlight should be able to be used.
【0009】しかしながら現実に市販の液晶表示装置の
バックライトに、このシステムを組み込んで試験をして
みると、前記のような偏光の高い再利用効率が得られな
いことがわかった。この原因に関して、前記試験に用い
たバックライトシステムはバックライトから発する光の
指向性を調節する必要性からプリズムシートと光散乱シ
ートが導光板上に積層された構造を有しており、前記の
1/4波長板と偏光反射板はこれらの光学部材の上に重
ね合わせて配置して試験を行ったこと、すなわちこれら
の光学部材の存在が再利用光の偏光状態に悪影響を与え
る結果、偏光変換効率が低下しているのではないかと考
えた。However, when this system was actually incorporated into a backlight of a commercially available liquid crystal display device and a test was conducted, it was found that such a high polarization recycling efficiency could not be obtained. Regarding this cause, the backlight system used in the test has a structure in which a prism sheet and a light scattering sheet are stacked on a light guide plate because of the need to adjust the directivity of light emitted from the backlight. The test was performed by placing the quarter-wave plate and the polarizing reflector on top of each other on these optical members. That is, as a result of the presence of these optical members adversely affecting the polarization state of the reused light, I thought that the conversion efficiency might have dropped.
【0010】本発明はこれらの問題を解決することを目
的にしており、偏光反射板を用いたバックライトシステ
ムにおいて、偏光反射板で反射された偏光の高い再利用
効率(偏光変換効率)と、バックライトの光の指向性を
調整する機能の双方をあわせ持つ新規な光学部材を得る
ことを目的とする。An object of the present invention is to solve these problems. In a backlight system using a polarizing reflector, a high reuse efficiency (polarization conversion efficiency) of polarized light reflected by the polarizing reflector is achieved. It is an object of the present invention to obtain a novel optical member having both functions of adjusting the directivity of light of a backlight.
【0011】[0011]
【課題を解決するための手段】本発明は、可視波長域の
波長の光に対する1/4波長板であって、該1/4波長
板は、1/4波長層と、(1)その一方の表層に連続的
に凹凸が形成されてなり、かつ(2)該表層を透過する
光が主として該凹凸面において多方向に屈折される光拡
散層とからなることを特徴とする1/4波長板である。
またさらには、前記光拡散層が、平均粒径が1〜20μ
mの透明微粒子を含有する樹脂層からなり、かつ該樹脂
層の厚さは該微粒子の平均粒径より小さいことを特徴と
するものである。According to the present invention, there is provided a quarter-wave plate for light having a wavelength in a visible wavelength range, wherein the quarter-wave plate includes a quarter-wave layer and (1) one of them. And (2) a light diffusing layer in which light transmitted through the surface layer is mainly refracted in multiple directions on the uneven surface. It is a board.
Still further, the light diffusion layer has an average particle size of 1 to 20 μm.
m, comprising a resin layer containing m transparent fine particles, and wherein the thickness of the resin layer is smaller than the average particle size of the fine particles.
【0012】[0012]
【発明の実施の形態】本発明の1/4波長板は、前述の
ような偏光反射板を用いた液晶表示装置のバックライト
システムにおいて、偏光反射板で反射された偏光を高効
率で他方の偏光に変換する優れた偏光変換機能と、バッ
クライトの光の指向性を調整する機能を併せ持つことを
大きな特徴としている。BEST MODE FOR CARRYING OUT THE INVENTION A quarter-wave plate of the present invention can be used in a backlight system of a liquid crystal display device using the above-described polarizing reflector to efficiently reflect polarized light reflected by the polarizing reflector on the other side. A major feature is that it has both an excellent polarization conversion function to convert to polarized light and a function to adjust the directivity of light from the backlight.
【0013】具体的には、1/4波長板として機能する
フィルム(以下1/4波長層と呼ぶ)に、に光の指向性
を調節する機能を有するが光の偏光状態にはほとんど悪
影響を与えないような光散乱層やプリズム層を形成した
新規の光学部材であり、この光の偏光状態に悪影響を与
えないという観点から、特に光散乱層は、かかる1/4
波長層の表面に、凹凸がほぼ全面にわたって連続的に形
成されてなり、かかる光拡散層を透過する光は、主に該
凹凸面において多方向に屈折されることにより光拡散性
を発現する光拡散層であることを特徴とするものであ
る。この屈折する光は、該凹凸面界面の屈折率差により
多方向に屈折され光拡散性を発現する。Specifically, a film functioning as a quarter-wave plate (hereinafter referred to as a quarter-wave layer) has a function of adjusting the directivity of light, but has almost no adverse effect on the polarization state of light. It is a novel optical member having a light scattering layer and a prism layer formed so as not to give the light.
On the surface of the wavelength layer, irregularities are continuously formed over almost the entire surface, and light that passes through the light diffusion layer is light that expresses light diffusivity mainly by being refracted in multiple directions on the irregular surface. It is a diffusion layer. The refracted light is refracted in multiple directions due to the difference in the refractive index at the uneven surface interface, and exhibits light diffusivity.
【0014】また更には、一枚の部材に偏光変換機能と
光の指向性を調整する機能の二つの機能を両立させてい
ることから、各々の機能の光学部材を数枚重ね合わせて
用いた場合に比べ、構成の簡略化ひいては製造工程の簡
略化が実現できる利点を有し、さらに空気との界面の数
を少なくできるので空気と部材との界面反射によるバッ
クライト透過率の低下を抑制できるといった利点も有し
ている。Furthermore, since two functions of the polarization conversion function and the function of adjusting the directivity of light are made compatible with one member, several optical members of each function are used by being superposed. As compared with the case, there is an advantage that simplification of the configuration and thus simplification of the manufacturing process can be realized, and furthermore, since the number of interfaces with air can be reduced, a decrease in backlight transmittance due to reflection at the interface between air and members can be suppressed. It also has such advantages.
【0015】本発明における1/4波長層は、可視域の
広い波長範囲で1/4波長板として機能するようなフィ
ルムであり、例えばポリカーボネート、ポリビニルア
ルコール、セルロースアセテート等の透明性に優れた熱
可塑性樹脂からなるフィルムを、該フィルムのガラス転
移温度近傍の温度において一軸延伸し、可視域の波長の
およそ1/4程度(およそ95〜195nm)の位相差
を有するようにしたフィルム(例えば実施例1に述べる
ような、波長540nmにおける位相差が135nmで
あるポリカーボネートフィルム)、例えば特開平5−
27119号公報に記載されているような、複屈折率の
波長分散性の相異なる二種の一軸延伸高分子フィルム
(例えばポリカーボネートとポリビニルアルコール)を
両者の遅相軸が直交させて積層したフィルム、特開平
10−68816号公報に記載されているような、同種
の材料による1/4波長板と1/2波長板を特定の角度
で貼りあわせた積層波長板等を挙げることができる。The quarter-wave layer in the present invention is a film that functions as a quarter-wave plate in a wide wavelength range of the visible region, and is, for example, a heat-exchange film having excellent transparency such as polycarbonate, polyvinyl alcohol, and cellulose acetate. A film made of a plastic resin is uniaxially stretched at a temperature near the glass transition temperature of the film so that the film has a phase difference of about 1/4 (approximately 95 to 195 nm) of the wavelength in the visible region (for example, Examples). 1, a polycarbonate film having a phase difference of 135 nm at a wavelength of 540 nm)
No. 27119, a film obtained by laminating two kinds of uniaxially stretched polymer films (for example, polycarbonate and polyvinyl alcohol) having different wavelength dispersions of birefringence with their slow axes perpendicular to each other. As described in Japanese Patent Application Laid-Open No. 10-68816, a laminated wave plate in which a た wavelength plate and a 波長 wavelength plate made of the same material are bonded at a specific angle can be used.
【0016】本発明における1/4波長層の厚さは、特
に制限はないが、およそ10〜400μmのものが好ま
しい。The thickness of the quarter wavelength layer in the present invention is not particularly limited, but is preferably about 10 to 400 μm.
【0017】本発明の1/4波長板は、その一方の表面
に光拡散層を有するものである。この光拡散層は光散乱
性能を持ち、該1/4波長板を垂直に透過する光に対す
るヘイズ値がおよそ30%以上で透過率が80%以上で
ある本発明の1/4波長板を与えるものである。これに
加えて本発明においては、かかる光拡散層を透過する偏
光に対してその偏光状態に悪影響を与えないことが特性
として必要とされる。The quarter-wave plate of the present invention has a light diffusion layer on one surface. This light diffusion layer has a light scattering performance, and provides a quarter wave plate of the present invention having a haze value of about 30% or more and a transmittance of 80% or more for light vertically transmitted through the quarter wave plate. Things. In addition, in the present invention, it is required as a characteristic that the polarized light transmitted through the light diffusion layer has no adverse effect on the polarization state.
【0018】これに関する本発明者らの検討によれば、
前記の光散乱性能が得られるように、樹脂中に該樹脂と
屈折率の異なる微粒子を適量分散して製造した、主とし
て該樹脂と微粒子との屈折率の相違による光の多重屈
折、反射を利用した光散乱層を用いた場合には、光拡散
層を通過する光が層内で受ける屈折、反射の回数が増加
すればするほど、光の偏光状態が大きく乱される(以下
偏光解消と記す)ことがわかった。According to the study by the present inventors regarding this,
In order to obtain the above-mentioned light scattering performance, it is manufactured by dispersing an appropriate amount of fine particles having a different refractive index from the resin in a resin, and mainly utilizes multiple refraction and reflection of light due to a difference in refractive index between the resin and the fine particles. When a light scattering layer is used, the more the number of refractions and reflections of light passing through the light diffusion layer within the layer increases, the more the polarization state of light is disturbed (hereinafter referred to as depolarization). )I understand.
【0019】これに対し光散乱層は、その表面に凹凸面
を連続的に有しており、かかる光拡散層内部の屈折率は
ほぼ均一であるような場合には、主として凹凸面と空気
との界面で光の屈折が起こり、かかる光拡散層を通過す
る光の偏光状態はほとんど乱されず、かつ前記の光散乱
性能が発現することを見い出した。On the other hand, the light scattering layer has an uneven surface continuously on its surface, and when the refractive index inside the light diffusion layer is almost uniform, the uneven surface and the air are mainly It has been found that refraction of light occurs at the interface, and that the polarization state of light passing through the light diffusion layer is hardly disturbed, and that the light scattering performance described above is exhibited.
【0020】この理由は、おそらく後者の光散乱層で
は、かかる層を通過する光は凹凸表面と空気との界面で
ほぼ一回屈折されるだけであること、更に凹凸の形成さ
れた層表面と空気との屈折率差が大きいので屈折角が大
きく取れることによると考えられる。The reason for this is probably that in the latter light scattering layer, the light passing through such a layer is only refracted almost once at the interface between the uneven surface and the air. It is considered that the difference in refractive index from air is large, so that a large refraction angle can be obtained.
【0021】こうした光散乱層の作成方法としては、例
えば適当な凹凸形状を内面に刻んだ鋳型を、1/4波長
層上にコーティングした樹脂層に押し付けて、形状を該
1/4波長層の表面に転写することによって作成するこ
とができる。As a method for forming such a light scattering layer, for example, a mold in which an appropriate uneven shape is cut on the inner surface is pressed against a resin layer coated on the 1/4 wavelength layer to change the shape of the 1/4 wavelength layer. It can be created by transferring to a surface.
【0022】あるいは、光散乱層は透明微粒子を分散し
た樹脂液もしくはそれを溶剤で希釈した塗液を、かかる
層の膜厚が微粒子の粒径より小さくなるように1/4波
長層上にコーティングすることによって製造することも
できる。すなわちかかる光散乱層の膜厚に対し1.1〜
3倍程度の平均粒径を有する微粒子を樹脂中に分散した
塗液を用いることにより、1/4波長層上にコーティン
グされた層の表面には微粒子の一部分(例えば上半球部
分)を突き出して表面に凹凸が形成することができる。
(微粒子の表面が露出した状態であり、実際は、微粒子
上を樹脂が薄く被覆した状態となって凹凸を形成する場
合が多い。)Alternatively, the light-scattering layer is coated with a resin liquid in which transparent fine particles are dispersed or a coating liquid obtained by diluting the resin liquid with a solvent on the quarter-wavelength layer so that the film thickness of the layer is smaller than the particle diameter of the fine particles. Can also be produced. That is, the thickness of the light scattering layer is 1.1 to 1.1.
By using a coating liquid in which fine particles having an average particle diameter of about three times are dispersed in a resin, a part of the fine particles (for example, an upper hemispherical part) is projected on the surface of the layer coated on the 波長 wavelength layer. Irregularities can be formed on the surface.
(This is a state in which the surface of the fine particles is exposed, and in practice, irregularities are often formed in a state in which the fine particles are covered with a thin resin.)
【0023】微粒子の平均粒径はおよそ1〜20μm程
度であることが好ましく、樹脂に対する分散比率は重量
比率でおよそ5〜75%の範囲にあることが好ましい。The average particle diameter of the fine particles is preferably about 1 to 20 μm, and the dispersion ratio to the resin is preferably in the range of about 5 to 75% by weight.
【0024】ここで用いる透明微粒子としては、塗液中
で微粒子の凝集や沈降が起こりにくいものを用いる事が
好ましく、具体的には市販のシリカ、酸化チタン、アル
ミナ等の無機微粒子や有機シリコーン微粒子、架橋アク
リル微粒子、架橋ポリスチレン微粒子等が好ましく用い
られ、必要に応じて数種の微粒子を組み合わせて用いて
も良い。As the transparent fine particles used here, it is preferable to use those which are unlikely to cause aggregation or sedimentation of the fine particles in the coating liquid. Specifically, inorganic fine particles such as commercially available silica, titanium oxide and alumina and organic silicone fine particles are used. , Crosslinked acrylic fine particles, crosslinked polystyrene fine particles and the like are preferably used, and if necessary, several kinds of fine particles may be used in combination.
【0025】微粒子を分散する樹脂層としては、例えば
紫外線硬化型樹脂層やフェノキシ系、エポキシ系、シリ
コーン系の熱硬化型樹脂層等が好ましく用いられる。As the resin layer in which the fine particles are dispersed, for example, an ultraviolet-curable resin layer, a phenoxy-based, epoxy-based, or silicone-based thermosetting resin layer is preferably used.
【0026】これらの中でも、紫外線硬化型樹脂層とシ
リコーン系の熱硬化型樹脂層は、比較的短時間に機械強
度の高い層が得られることから最も好ましく用いられ
る。Among these, an ultraviolet-curable resin layer and a silicone-based thermosetting resin layer are most preferably used because a layer having high mechanical strength can be obtained in a relatively short time.
【0027】紫外線硬化型樹脂は、紫外線を照射するこ
とによって硬化が進行する樹脂を指し、例えば単位構造
内に2個以上のアクリロイル基を有する多官能アクリレ
ート成分を樹脂組成中に含有するアクリル系樹脂を挙げ
ることができる。例えばトリメチロールプロパントリア
クリレート、トリメチロールプロパンエチレンオキサイ
ド変性トリアクリレート、トリメチロールプロパンプロ
ピレンオキサイド変性トリアクリレート、イソシアヌル
酸エチレンオキサイド変性トリアクリレート、ペンタエ
リスリトールテトラアクリレート、ジペンタエリスリト
ールペンタアクリレート、ジペンタエリスリトールヘキ
サアクリレート、ジメチロールトリシクロデカンジアク
リレート等の各種アクリレートモノマーや、ポリエステ
ル変性もしくはウレタン変性、エポキシ変性の多官能ア
クリレートオリゴマー等が本用途に好ましく用いられ
る。これらの樹脂は単独の組成で用いても、数種の混合
組成で用いても良く、又、場合によっては、各種ケイ素
アルコキシドの加水分解物を組成中に適量添加すること
も好ましい。The UV-curable resin refers to a resin that cures when irradiated with ultraviolet rays. For example, an acrylic resin containing a polyfunctional acrylate component having two or more acryloyl groups in a unit structure in the resin composition Can be mentioned. For example, trimethylolpropane triacrylate, trimethylolpropane ethylene oxide modified triacrylate, trimethylolpropane propylene oxide modified triacrylate, isocyanuric acid ethylene oxide modified triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, Various acrylate monomers such as dimethylol tricyclodecane diacrylate, and polyester-modified, urethane-modified, and epoxy-modified polyfunctional acrylate oligomers are preferably used for this purpose. These resins may be used in a single composition or in a mixed composition of several kinds. In some cases, it is also preferable to add appropriate amounts of hydrolysates of various silicon alkoxides to the composition.
【0028】また紫外線硬化型樹脂の硬化速度を向上さ
せるため、公知の光反応開始剤を添加することができ
る。例えばジエトキシアセトフェノン、2−メチル−1
−{4−(メチルチオ)フェニル}−2−モルフォリノ
プロパン、2−ヒドロキシ−2−メチル−1−フェニル
プロパン−1−オン、1−ヒドロキシシクロヘキシルフ
ェニルケトン等のアセトフェノン系化合物;ベンゾイ
ン、ベンジルジメチルケタール等のベンゾイン系化合
物;ベンゾフェノン、ベンゾイル安息香酸等のベンゾフ
ェノン系化合物;チオキサンソン、2,4−ジクロロチ
オキサンソン等のチオキサンソン系化合物等による光開
始剤が好ましく用いられる。In order to improve the curing speed of the ultraviolet curable resin, a known photoreaction initiator can be added. For example, diethoxyacetophenone, 2-methyl-1
Acetophenone compounds such as-{4- (methylthio) phenyl} -2-morpholinopropane, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenylketone; benzoin, benzyldimethylketal Benzoin-based compounds such as benzophenone and benzoylbenzoic acid; and photoinitiators such as thioxanthone-based compounds such as thioxanthone and 2,4-dichlorothioxanthone.
【0029】シリコーン系の熱硬化型樹脂層としては、
2〜4官能性、更に好ましくは3〜4官能性ののケイ素
アルコキシドを二種以上混合して用いることが好まし
く、これらをあらかじめ溶液中で適度に加水分解ならび
に脱水縮合を行なって適度にオリゴマー化させたものも
好ましく用いられる。As the silicone-based thermosetting resin layer,
It is preferable to use a mixture of two or more silicon alkoxides having 2 to 4 functionalities, more preferably 3 to 4 functionalities, and to carry out appropriate hydrolysis and dehydration condensation in a solution in advance to appropriately oligomerize. Those that have been used are also preferably used.
【0030】使用可能なケイ素アルコキシドの例として
は、例えばテトラメトキシシラン、テトラエトキシシラ
ン、メチルトリメトキシシラン、メチルトリエトキシシ
ラン、ジメチルジメトキシシラン、γ−グリシドキシプ
ロピルトリメトキシシラン、β−(3、4エポキシシク
ロヘキシル)エチルトリメトキシシラン、ビニルトリメ
トキシシラン、N−β(アミノエチル)γ−アミノプロ
ピルトリメトキシシラン、N−β(アミノエチル)γ−
アミノプロピルメチルジメトキシシラン、γ−アミノプ
ロピルトリエトキシシラン等が例示される。Examples of usable silicon alkoxides include, for example, tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3 4, epoxycyclohexyl) ethyltrimethoxysilane, vinyltrimethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (aminoethyl) γ-
Examples include aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, and the like.
【0031】これらのケイ素アルコキシドによる層は、
熱的に架橋が進行するが、必要に応じて紫外線等の活性
光線を塗膜に照射することによって、架橋度をより高め
ることができる。These silicon alkoxide layers are:
Crosslinking proceeds thermally, but the degree of crosslinking can be further increased by irradiating the coating with actinic rays such as ultraviolet rays as necessary.
【0032】上記樹脂層の厚さは、該微粒子の平均粒径
より小さいことが望ましい。このとき該樹脂層の厚さ
は、光拡散層の凹部の厚さを指す。The thickness of the resin layer is desirably smaller than the average particle size of the fine particles. At this time, the thickness of the resin layer indicates the thickness of the concave portion of the light diffusion layer.
【0033】又、これらの層は主として湿式コーティン
グにより前記1/4波長層上に形成(積層)することが
できるが、前記の樹脂組成物、微粒子等を各種有機溶剤
に溶解して、濃度や粘度を調節した塗液を用いて前記1
/4波長層上に塗工後、紫外線照射や加熱処理等により
層を硬化させることにより積層することができる。These layers can be formed (laminated) on the 波長 wavelength layer mainly by wet coating. The resin composition, fine particles and the like are dissolved in various organic solvents to obtain a concentration and a concentration. Using the coating liquid whose viscosity has been adjusted,
After coating on the 波長 wavelength layer, the layer can be laminated by curing the layer by ultraviolet irradiation, heat treatment or the like.
【0034】なお、こうしたコーティング方法として
は、マイクログラビヤコート法、ダイコート法、リバー
スロールコート法、カーテンコート法、スピンコート法
等の各種の方法が用いられる。As such a coating method, various methods such as a micro gravure coating method, a die coating method, a reverse roll coating method, a curtain coating method, and a spin coating method are used.
【0035】また本発明においては、1/4波長層にお
ける光散乱層が形成(積層)された面と反対の面に、プ
リズム列を配列したプリズム層を形成することも好まし
い。In the present invention, it is also preferable to form a prism layer in which prism rows are arranged on the surface of the quarter wavelength layer opposite to the surface on which the light scattering layer is formed (laminated).
【0036】このようなプリズム層は、該プリズム層に
斜めに入射した光を、主に該プリズム層の鉛直方向に出
射させる機能を有する層であり、およそ50〜200μ
mのピッチで頂角がおよそ45〜135度のプリズム列
を配列した層が好適に用いられる。Such a prism layer is a layer having a function of emitting light obliquely incident on the prism layer mainly in the vertical direction of the prism layer.
A layer in which prism rows having an apex angle of about 45 to 135 degrees at a pitch of m are preferably used.
【0037】かかるプリズム層は例えば、プリズムの形
状を内面に刻んだ鋳型と1/4波長層との間に前記のよ
うな紫外線硬化型樹脂を挟持させて紫外線を照射して樹
脂を硬化し、硬化した樹脂層を鋳型から剥離して基板上
に形成する方法により作成することができる。Such a prism layer is formed, for example, by sandwiching the above-mentioned UV-curable resin between a mold in which the shape of the prism is cut on the inner surface and a 波長 wavelength layer, and irradiating UV rays to cure the resin. It can be formed by a method in which the cured resin layer is separated from the mold and formed on the substrate.
【0038】ここで鋳型としては公知の射出成形に用い
る鋳型を用いることができ、例えば黄銅、アルミニウム
等の金属製の型や、テフロン等の樹脂製の型等を用いる
ことができる。As the mold, a known mold used for injection molding can be used. For example, a metal mold such as brass or aluminum, a resin mold such as Teflon, or the like can be used.
【0039】なお上記紫外線硬化型樹脂としては、硬化
収縮および光学弾性係数の小さいものを使用することが
より好ましい。It is more preferable to use a resin having a small curing shrinkage and a small optical elasticity coefficient as the ultraviolet curing resin.
【0040】プリズム層の厚さは、10〜250μmが
好ましい。The thickness of the prism layer is preferably from 10 to 250 μm.
【0041】なお本発明においては、1/4波長層(基
板)表面もしくは光拡散層表面に透明導電層を積層する
ことできる。In the present invention, a transparent conductive layer can be laminated on the surface of the quarter wavelength layer (substrate) or the surface of the light diffusion layer.
【0042】すなわち本発明の1/4波長板に、透明導
電層が形成された積層フィルムを前述のバックライトシ
ステムに用いる際に、バックライトの光源点灯回路もし
くは液晶パネル駆動回路のグラウンドラインと、積層し
た透明導電層とを電気的に接続することにより、バック
ライトから液晶パネルの方向に伝播する電磁ノイズを遮
断する機能を付与することができる。なおここで透明導
電層とグラウンドラインとの電気的接続には導電性テー
プ(導電性金属箔テープ等)が好適に用いられる。That is, when the laminated film having the transparent conductive layer formed on the quarter-wave plate of the present invention is used in the above-mentioned backlight system, the light source lighting circuit of the backlight or the ground line of the liquid crystal panel driving circuit may be used. By electrically connecting the stacked transparent conductive layers, a function of blocking electromagnetic noise propagating from the backlight toward the liquid crystal panel can be provided. Here, a conductive tape (such as a conductive metal foil tape) is suitably used for electrical connection between the transparent conductive layer and the ground line.
【0043】このような透明導電層としては、公知の各
種金属酸化物半導体を用いることができ、例えば錫酸化
物(SnO2)及び/又はインジウム酸化物(In
2O3)の層、特に両者の化合物であるITOが好ましく
用いられる。As such a transparent conductive layer, various known metal oxide semiconductors can be used. For example, tin oxide (SnO 2 ) and / or indium oxide (In)
The layer of 2 O 3 ), particularly ITO which is a compound of both layers, is preferably used.
【0044】透明導電層の膜厚は電磁遮蔽性と光線透過
率性、生産性等の観点からおよそ10〜200nmの範
囲にあることが好ましく、スパッタリング法、イオンプ
レーティング法、真空蒸着法、CVD法等の公知の気相
堆積法を用いて積層することができる。中でも幅方向、
長さ方向での膜厚均一性、組成均一性の面からはスパッ
タリング法が好ましい。The thickness of the transparent conductive layer is preferably in the range of about 10 to 200 nm from the viewpoints of electromagnetic shielding, light transmittance, productivity, etc., and is preferably a sputtering method, an ion plating method, a vacuum evaporation method, a CVD method, or the like. The layers can be stacked using a known vapor deposition method such as a deposition method. Among them, in the width direction,
The sputtering method is preferable from the viewpoint of the uniformity of the film thickness in the length direction and the uniformity of the composition.
【0045】なお特に透明導電層が空気層と接して1/
4波長層の最表面に積層される場合には、透明導電層と
空気層の界面での反射が大きくなり、全体の光線透過率
が低下する場合がある。In particular, when the transparent conductive layer comes into contact with the air layer,
When laminated on the outermost surface of the four-wavelength layer, reflection at the interface between the transparent conductive layer and the air layer increases, and the overall light transmittance may decrease.
【0046】このような場合、透明導電層上に低屈折率
の層を適切な膜厚で積層するか、もしくは下地層として
透明導電層に接する側から低屈折率の層、高屈折率の層
を適切な膜厚に積層することにより、透明導電層表面の
反射率を低減し積層フィルム全体の透過率を高めること
ができる。In such a case, a low-refractive-index layer is laminated on the transparent conductive layer with an appropriate thickness, or a low-refractive-index layer or a high-refractive-index layer is formed as an underlayer from the side in contact with the transparent conductive layer. Is laminated to an appropriate thickness, thereby reducing the reflectance on the surface of the transparent conductive layer and increasing the transmittance of the entire laminated film.
【0047】ここで低屈折率の層としては、例えば真空
蒸着、スパッタリング、イオンプレーティング、CVD
等の真空プロセスを用いて製膜したMgF、SiO2、
Al2O3等の無機誘電体膜や、湿式コーティングにより
形成したシリコーンアルコキシドを熱硬化してなる層等
が挙げられる。高屈折率の層としては例えば、チタニウ
ム、ジルコニウム、錫、タンタル、インジウム等の金属
アルコキシドおよびそれらの混合物を熱硬化させてなる
層等が挙げられる。Here, as the layer having a low refractive index, for example, vacuum deposition, sputtering, ion plating, CVD
MgF, SiO 2 , formed using a vacuum process such as
Examples include an inorganic dielectric film such as Al 2 O 3 and a layer obtained by thermally curing a silicone alkoxide formed by wet coating. Examples of the layer having a high refractive index include a layer obtained by thermally curing a metal alkoxide such as titanium, zirconium, tin, tantalum, and indium, and a mixture thereof.
【0048】[0048]
【実施例】以下、本発明を実施例をもってさらに具体的
に説明する。尚、実施例、比較例における各種測定は以
下の要領で行ったものである。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. The various measurements in the examples and comparative examples were performed as follows.
【0049】リタデーションの測定 日本分光社製多波長複屈折測定装置M−150を用いて
測定した。Measurement of retardation The retardation was measured using a multi-wavelength birefringence measuring apparatus M-150 manufactured by JASCO Corporation.
【0050】光線透過率およびヘイズ値 日本電色工業社製COH−300Aを用いて測定を行っ
た。The light transmittance and the haze value were measured using COH-300A manufactured by Nippon Denshoku Industries Co., Ltd.
【0051】出射光の偏光強度の測定 バックライトの対角線の中心点からの出射光の偏光強度
を大塚電子製LCD評価装置LCD5100を用いて測
定を行った。この際、LCD5100の光検出器(円筒
状)の先端に二色性偏光子を取り付け、この偏光子の偏
光軸(光透過率が最大になる光学軸)の方向がバックラ
イトの短辺の方向に平行になるように固定した。Measurement of Polarization Intensity of Emitted Light The polarization intensity of the emitted light from the center point of the diagonal line of the backlight was measured using an LCD evaluation device LCD5100 manufactured by Otsuka Electronics. At this time, a dichroic polarizer is attached to the tip of a photodetector (cylindrical) of the LCD 5100, and the direction of the polarization axis (optical axis at which light transmittance is maximized) of the polarizer is the direction of the short side of the backlight. It was fixed to be parallel to.
【0052】出射光の偏光強度はバックライトから様々
な出射角度をもって出射する光の平均強度として測定し
た。すなわち前記光検出器を、図2に示すように、1/
4波長層に積層されたプリズム列の稜線と平行な方位
(0度)と直角な方位(90度)および±45度の計4
方位に対し、鉛直方向を中心(0度)として−60〜+
60度の角度範囲の円弧上を移動させ、円弧上で10度
ごとに偏光強度の測定を行って、それらの平均値を出射
光の偏光強度とした。The polarization intensity of the emitted light was measured as the average intensity of the light emitted from the backlight at various angles. That is, as shown in FIG.
A total of 4 directions (90 degrees) and ± 45 degrees perpendicular to the direction (0 degrees) parallel to the ridge line of the prism array stacked in the four-wavelength layer
With respect to the azimuth, -60 to + with the vertical direction as the center (0 degree)
The light was moved on an arc within an angle range of 60 degrees, the polarization intensity was measured every 10 degrees on the arc, and the average value thereof was taken as the polarization intensity of the emitted light.
【0053】[実施例1]まず第一に溶液流延法により
製膜した幅1080mm、厚さ100μmのポリカーボ
ネートフィルム(帝人製ピュアエースC110)を15
0℃で1.023倍に一軸延伸して、波長540nmに
おける位相差が135nmであるフィルムを作成した。Example 1 First, a polycarbonate film (Pure Ace C110, Teijin) having a width of 1080 mm and a thickness of 100 μm formed by a solution casting method was used.
The film was uniaxially stretched 1.03 times at 0 ° C. to prepare a film having a phase difference of 135 nm at a wavelength of 540 nm.
【0054】つぎに紫外線硬化型樹脂(日本化薬社製K
AYARAD TMPTA)100重量部、透明微粒子
として平均粒径が5μmのアクリル樹脂架橋微粒子(積
水化成品工業製テクポリマーMB20X−5)150重
量部、光開始剤(チバガイギ−社製イルガキュア18
4)5重量部、レベリング剤(東レ・ダウシリコーン社
製SH28PA)0.1重量部、希釈溶剤として1−メ
トキシ−2−プロパノール 500重量部を混合してな
る塗液を上記フィルム上にロールコーティングし、溶剤
乾燥後に高圧水銀ランプにより500mJ/cm2の紫
外線を照射してコーティング層を硬化させ、平均膜厚が
約2.4μmの光拡散層が積層されたフィルムを得た。
なおこのフィルムの光線透過率は91.5%、ヘイズは
85.8%であった。Next, an ultraviolet curable resin (K manufactured by Nippon Kayaku Co., Ltd.)
AYARAD TMPTA) 100 parts by weight, 150 parts by weight of acrylic resin crosslinked fine particles (Techpolymer MB20X-5 manufactured by Sekisui Plastics Co., Ltd.) having an average particle size of 5 μm as transparent fine particles, and a photoinitiator (Irgacure 18 manufactured by Ciba Geigy)
4) Roll coating of the above film with a coating liquid obtained by mixing 5 parts by weight, 0.1 part by weight of a leveling agent (SH28PA manufactured by Dow Silicone Toray) and 500 parts by weight of 1-methoxy-2-propanol as a diluting solvent. After the solvent was dried, the coating layer was cured by irradiating ultraviolet rays of 500 mJ / cm 2 with a high-pressure mercury lamp to obtain a film on which a light diffusion layer having an average thickness of about 2.4 μm was laminated.
The light transmittance of this film was 91.5% and the haze was 85.8%.
【0055】次にこのフィルムから、カッターで前記延
伸方向に対し45度の方向を横方向として縦170m
m、横220mmの長方形のフィルムを切り出した。Next, the film was 170 m long by a cutter, with the direction at 45 ° to the stretching direction being the horizontal direction.
m, a rectangular film having a width of 220 mm was cut out.
【0056】続いてピッチ50μm、頂角70度のプリ
ズム列形状を内面に刻んだ黄銅製の金型に、紫外線硬化
型樹脂(日本化薬社製KAYARAD HX−620
50重量部、同社製KARAYAD R−551 25
重量部 第一工業製薬社製ニューフロンティア BR−
42M 25重量部からなる)と光開始剤(チバガイギ
−社製イルガキュア184)2重量部の混合液を注入
後、前記フィルムの光拡散層が形成されていない側の面
を気泡が入らないように重ね合わせた後、フィルム側か
ら高圧水銀ランプによる600mJ/cm2の紫外線を
照射して樹脂を硬化し、続いて該フィルムを剥離するこ
とにより、プリズム形状を有する紫外線硬化型樹脂層を
フィルム上に形成した。なおこの時、フィルムの縦方向
にプリズム列の稜線の方向が一致するようにした。Subsequently, a brass mold in which a prism array having a pitch of 50 μm and an apex angle of 70 ° was carved on the inner surface was coated with an ultraviolet-curable resin (KAYARAD HX-620 manufactured by Nippon Kayaku Co., Ltd.).
50 parts by weight, KARAYAD R-551 25 manufactured by the company
Parts by weight Dai-ichi Kogyo Seiyaku Co., Ltd. New Frontier BR-
After injecting a mixture of 2 parts by weight of 42M and 25 parts by weight of a photoinitiator (Irgacure 184 manufactured by Ciba Geigy Co., Ltd.), air bubbles are prevented from entering the surface of the film where the light diffusion layer is not formed. After overlapping, the resin is cured by irradiating 600 mJ / cm 2 ultraviolet rays from the film side with a high-pressure mercury lamp, and then the film is peeled off, thereby forming a prism-shaped ultraviolet curable resin layer on the film. Formed. At this time, the direction of the ridge line of the prism row was made to coincide with the longitudinal direction of the film.
【0057】こうして作成したサンプルの評価は図1に
示すエッジライト方式のバックライトを用いて行った。The evaluation of the sample thus produced was carried out using an edge light type backlight shown in FIG.
【0058】すなわち対角11.3インチのSTN−L
CDを搭載した市販のノート型パソコンを分解して冷陰
極管を発光源とするエッジライト型のバックライトモジ
ュールからプリズムシートと光拡散シート(共に二軸延
伸PETを基板としたもの)を取りはずして、その代わ
りに導光板側から前記サンプルと偏光反射板(住友スリ
ーエム社製DBEF)をこの順に重ねあわせて配置し
た。That is, STN-L with a diagonal of 11.3 inches
Disassemble a commercially available notebook computer equipped with a CD and remove the prism sheet and light diffusion sheet (both using biaxially stretched PET as a substrate) from the edge light type backlight module using a cold cathode tube as a light source. Instead, the sample and the polarizing reflector (DBEF manufactured by Sumitomo 3M Limited) were arranged in this order from the light guide plate side.
【0059】つぎにパソコンのスイッチを入れ、冷陰極
管を点灯させて30分間安定させた後、バックライトか
らの出射光の偏光強度を測定した。測定結果は表1に示
す。Next, the personal computer was turned on, the cold cathode tube was turned on and stabilized for 30 minutes, and then the polarization intensity of the light emitted from the backlight was measured. Table 1 shows the measurement results.
【0060】[比較例1]実施例1において偏光反射板
を使用せず、導光板上に実施例1で作成したサンプルの
みを配置した以外は実施例1と全く同様にして、バック
ライトからの出射光の偏光強度を測定した。測定結果は
表1に示す。[Comparative Example 1] A backlight was used in the same manner as in Example 1 except that the polarizing reflector was not used and only the sample prepared in Example 1 was disposed on the light guide plate. The polarization intensity of the emitted light was measured. Table 1 shows the measurement results.
【0061】[比較例2]二軸延伸PETフィルム(帝
人製HSLタイプ、75μm厚)上に実施例同様のプリ
ズム層を積層したフィルムと光拡散層を積層したフィル
ムの二枚を作成した。更に実施例1の光拡散層とプリズ
ム層を積層する工程を施していない段階の一軸延伸ポリ
カーボネートフィルム(位相差135nm)を用意し
た。[Comparative Example 2] Two films, a film obtained by laminating a prism layer similar to the example on a biaxially stretched PET film (HSL type manufactured by Teijin, 75 μm thick) and a film obtained by laminating a light diffusion layer were prepared. Further, a uniaxially stretched polycarbonate film (135 nm in retardation) was prepared, in which the step of laminating the light diffusion layer and the prism layer of Example 1 was not performed.
【0062】実施例1で作成したサンプルの代わりに、
前記のプリズム層を積層したPETフィルムと光拡散層
を積層したPETフィルムおよび一軸延伸ポリカーボネ
ートフィルムを導光板側からこの順番で重ねあわせて用
いた以外は全く実施例1と同様にバックライトを作成し
て、出射光の偏光強度を測定した。測定結果は表1に記
す。Instead of the sample prepared in Example 1,
A backlight was prepared in the same manner as in Example 1 except that the PET film laminated with the prism layer, the PET film laminated with the light diffusion layer, and the uniaxially stretched polycarbonate film were used in this order from the light guide plate side. Then, the polarization intensity of the emitted light was measured. Table 1 shows the measurement results.
【0063】[比較例3]実施例1で一軸延伸ポリカー
ボネートフィルム上に積層した光拡散層を以下の要領で
作成した以外は全く実施例1と同様にしてバックライト
を作成し、出射光の偏光強度を測定した。測定結果は表
1に示す。Comparative Example 3 A backlight was produced in the same manner as in Example 1 except that the light diffusion layer laminated on the uniaxially stretched polycarbonate film in Example 1 was prepared as follows, and the polarization of the emitted light was changed. The strength was measured. Table 1 shows the measurement results.
【0064】すなわち光拡散層を作成するための塗液と
して、紫外線硬化型樹脂(日本化薬社製KAYARAD
R−551 50重量部、東亜合成化学社製 アロニ
ックス M−8060 50重量部)、透明微粒子とし
て平均粒径が8.0μmのアクリル架橋微粒子(積水化
成品工業社製 MBX−8)120重量部および平均粒
径が3μmのシリコーン架橋微粒子(東芝シリコーン社
製トスパール130)60重量部、光開始剤(チバガイ
ギ−社製イルガキュア184)5重量部、レベリング剤
(東レ・ダウシリコーン社製SH28PA)0.1重量
部、希釈溶剤として1−メトキシ−2−プロパノール
200重量部を混合してなる塗液をロールコーティング
し、溶剤乾燥後に高圧水銀ランプにより500mJ/c
m2の紫外線を照射してコーティング層を硬化させ、微
粒子が主に樹脂層中に分散されてなる光拡散層が形成さ
れたフィルムを得た。尚、樹脂層の平均膜厚は約14μ
mであり、この光拡散層の表面には、凹凸がほとんど見
られなかった。フィルムの光線透過率は85%、ヘイズ
は88%であった。That is, as a coating liquid for forming a light diffusion layer, an ultraviolet curable resin (KAYARAD manufactured by Nippon Kayaku Co., Ltd.)
50 parts by weight of R-551, 50 parts by weight of Aronix M-8060 manufactured by Toa Gosei Chemical Co., Ltd., 120 parts by weight of acrylic crosslinked fine particles having an average particle size of 8.0 μm (MBX-8 manufactured by Sekisui Plastics Co., Ltd.) as transparent fine particles, and 60 parts by weight of silicone crosslinked fine particles having an average particle size of 3 μm (Tospearl 130 manufactured by Toshiba Silicone Co., Ltd.), 5 parts by weight of a photoinitiator (Irgacure 184 manufactured by Ciba-Geigy Co., Ltd.), 0.1 leveling agent (SH28PA manufactured by Dow Silicone Toray) 0.1 Parts by weight, 1-methoxy-2-propanol as a diluting solvent
Roll coating of a coating solution obtained by mixing 200 parts by weight, and drying of the solvent, followed by 500 mJ / c by a high-pressure mercury lamp.
The coating layer was cured by irradiating ultraviolet rays of m 2 to obtain a film having a light diffusion layer formed by dispersing fine particles mainly in a resin layer. The average thickness of the resin layer is about 14 μm.
m, and almost no irregularities were observed on the surface of the light diffusion layer. The light transmittance of the film was 85% and the haze was 88%.
【0065】[0065]
【表1】 [Table 1]
【0066】[0066]
【発明の効果】本発明を液晶表示装置における偏光反射
板を用いたバックライトに用いることにより、従来より
もバックライト出射光の利用効率を高めることが可能に
なった。また、本発明の1/4波長板は、一枚の部材
に、偏光変換機能と光の指向性を調整する機能の二つの
機能を両立させていることから、各々の機能の光学部材
を数枚重ね合わせて用いた場合に比べ、構成の簡略化ひ
いては製造工程の簡略化が実現できる利点を有し、さら
に空気との界面の数を少なくできるので空気と部材との
界面反射によるバックライト透過率の低下を抑制でき
る。By using the present invention for a backlight using a polarizing reflector in a liquid crystal display device, it is possible to increase the efficiency of use of light emitted from the backlight as compared with the prior art. In addition, the quarter-wave plate of the present invention has two functions of the polarization conversion function and the function of adjusting the directivity of light in one member. Compared to the case of using a plurality of superposed sheets, there is an advantage that the structure can be simplified and the manufacturing process can be simplified, and the number of interfaces with air can be reduced. The rate can be prevented from lowering.
【図1】本発明の1/4波長板を用いたバックライトの
構成を例示した模式図である。FIG. 1 is a schematic view illustrating the configuration of a backlight using a quarter-wave plate of the present invention.
【図2】本文記載の実施例、比較例においてバックライ
トの出射光の偏光強度を測定する方向(方位、あおり角
度)を説明する模式図である。FIG. 2 is a schematic diagram illustrating directions (azimuth, tilt angle) for measuring the polarization intensity of light emitted from a backlight in the examples and comparative examples described in the text.
1.発光源 2.導光板 3.反射板 4.プリズム列 5.1/4波長層 6.光拡散層 7.偏光反射板 1. 1. Light source Light guide plate 3. Reflector plate 4. 5. Prism array 5. 1/4 wavelength layer Light diffusion layer 7. Polarized reflector
Claims (6)
ムに用いるための1/4波長板であって、該1/4波長
板は、1/4波長層と、(1)その一方の表層に連続的
に凹凸が形成されてなり、かつ(2)該表層を透過する
光が主として該凹凸面において多方向に屈折されること
により光拡散性を発現する光拡散層とからなることを特
徴とする1/4波長板。1. A quarter-wave plate for use in a backlight system having a polarizing reflector, wherein the quarter-wave plate is continuous with a quarter-wave layer and (1) one of its surface layers. And (2) a light diffusion layer that expresses light diffusivity by mainly refracting light transmitted through the surface layer in multiple directions on the uneven surface. Quarter wave plate.
長板であって、該1/4波長板は、1/4波長層と、
(1)その一方の表層に連続的に凹凸が形成されてな
り、かつ(2)該表層を透過する光が主として該凹凸面
において多方向に屈折される光拡散層とからなることを
特徴とする1/4波長板。2. A quarter-wave plate for light having a wavelength in the visible wavelength range, the quarter-wave plate comprising a quarter-wave layer,
(1) One of the surface layers is formed with concavities and convexities continuously, and (2) a light diffusion layer in which light transmitted through the surface layer is mainly refracted in multiple directions on the concavo-convex surface. Quarter-wave plate.
率が80%以上である請求項1または2に記載の1/4
波長板。3. The quarter according to claim 1, wherein the haze value is 30% or more and the light transmittance is 80% or more.
Wave plate.
mの透明微粒子を有する樹脂層からなり、かつ該樹脂層
の厚さは該微粒子の平均粒径より小さいことを特徴とす
る請求項1〜3のいずれかに記載の1/4波長板。4. The light diffusion layer has an average particle diameter of 1 to 20 μm.
The quarter-wave plate according to any one of claims 1 to 3, comprising a resin layer having m transparent fine particles, and having a thickness smaller than the average particle diameter of the fine particles.
なる延伸フィルムである請求項1〜4のいずれかに記載
の1/4波長板。5. The quarter wavelength plate according to claim 1, wherein the quarter wavelength layer is a stretched film made of a thermoplastic resin.
対の表面に、プリズム形状を配列したプリズム層を有す
ることを特徴とする請求項1〜5のいずれかに記載の1
/4波長板。6. The method according to claim 1, wherein a prism layer having a prism shape is arranged on a surface of the quarter-wave plate opposite to the light diffusion layer.
/ 4 wavelength plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10187450A JP2000019325A (en) | 1998-07-02 | 1998-07-02 | 1/4 wavelength plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10187450A JP2000019325A (en) | 1998-07-02 | 1998-07-02 | 1/4 wavelength plate |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000019325A true JP2000019325A (en) | 2000-01-21 |
Family
ID=16206297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10187450A Pending JP2000019325A (en) | 1998-07-02 | 1998-07-02 | 1/4 wavelength plate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000019325A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006292562A (en) * | 2005-04-12 | 2006-10-26 | Fujikura Ltd | Surface plasmon sensor |
JP2007286447A (en) * | 2006-04-18 | 2007-11-01 | Keiwa Inc | LCD module |
JP2007286088A (en) * | 2006-04-12 | 2007-11-01 | Fujifilm Corp | Optical compensation sheet, method for manufacturing the same, and backlight unit for liquid crystal display device |
JP2007304219A (en) * | 2006-05-09 | 2007-11-22 | Keiwa Inc | Base film for optical sheet, optical sheet and liquid crystal display module |
EP1873579A1 (en) * | 2006-06-26 | 2008-01-02 | Keiwa Inc. | Optical unit and liquid crystal display module |
JP2011002851A (en) * | 2010-09-06 | 2011-01-06 | Hitachi Chem Co Ltd | Polarization conversion sheet and surface light source apparatus |
JP2015173066A (en) * | 2014-03-12 | 2015-10-01 | 大日本印刷株式会社 | Backlight device, liquid crystal display device and laminate |
US9869809B2 (en) | 2014-03-12 | 2018-01-16 | Dai Nippon Printing Co., Ltd. | Backlight unit, liquid-crystal display apparatus, and stacked structure |
CN115084407A (en) * | 2022-03-02 | 2022-09-20 | 南京迪视泰光电科技有限公司 | High-light extraction OLED device |
-
1998
- 1998-07-02 JP JP10187450A patent/JP2000019325A/en active Pending
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006292562A (en) * | 2005-04-12 | 2006-10-26 | Fujikura Ltd | Surface plasmon sensor |
JP2007286088A (en) * | 2006-04-12 | 2007-11-01 | Fujifilm Corp | Optical compensation sheet, method for manufacturing the same, and backlight unit for liquid crystal display device |
JP2007286447A (en) * | 2006-04-18 | 2007-11-01 | Keiwa Inc | LCD module |
JP2007304219A (en) * | 2006-05-09 | 2007-11-22 | Keiwa Inc | Base film for optical sheet, optical sheet and liquid crystal display module |
US7986388B2 (en) | 2006-05-09 | 2011-07-26 | Keiwa Inc. | Substrate film for optical sheets, optical sheet, and liquid crystal display module |
EP1873579A1 (en) * | 2006-06-26 | 2008-01-02 | Keiwa Inc. | Optical unit and liquid crystal display module |
JP2008003514A (en) * | 2006-06-26 | 2008-01-10 | Keiwa Inc | Optical unit and liquid crystal display module |
JP2011002851A (en) * | 2010-09-06 | 2011-01-06 | Hitachi Chem Co Ltd | Polarization conversion sheet and surface light source apparatus |
JP2015173066A (en) * | 2014-03-12 | 2015-10-01 | 大日本印刷株式会社 | Backlight device, liquid crystal display device and laminate |
US9869809B2 (en) | 2014-03-12 | 2018-01-16 | Dai Nippon Printing Co., Ltd. | Backlight unit, liquid-crystal display apparatus, and stacked structure |
CN115084407A (en) * | 2022-03-02 | 2022-09-20 | 南京迪视泰光电科技有限公司 | High-light extraction OLED device |
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