JP2003177399A - Semitransmission reflection plate having high designing characteristic, polarizing plate with semitransmission reflection plate and semitransmission reflection type liquid crystal display device using the same - Google Patents
Semitransmission reflection plate having high designing characteristic, polarizing plate with semitransmission reflection plate and semitransmission reflection type liquid crystal display device using the sameInfo
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- JP2003177399A JP2003177399A JP2001379050A JP2001379050A JP2003177399A JP 2003177399 A JP2003177399 A JP 2003177399A JP 2001379050 A JP2001379050 A JP 2001379050A JP 2001379050 A JP2001379050 A JP 2001379050A JP 2003177399 A JP2003177399 A JP 2003177399A
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- Japan
- Prior art keywords
- semi
- plate
- liquid crystal
- transmissive
- transflective
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- Liquid Crystal (AREA)
- Optical Filters (AREA)
- Optical Elements Other Than Lenses (AREA)
- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、液晶表示装置（以
下、「ＬＣＤ」と略称することがある。）に使用される
意匠性の高い半透過反射板、半透過反射板付き偏光板、
およびそれを用いた半透過反射液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-transmissive reflection plate having high designability, a polarizing plate with a semi-transmission reflection plate, which is used in a liquid crystal display device (hereinafter, may be abbreviated as "LCD").
And a transflective liquid crystal display device using the same.
【０００２】[0002]
【従来の技術】ＬＣＤは、卓上電子計算機、電子時計、
パーソナルコンピューター、ワードプロセッサ等に使用
され、近年急激にその需要が増加しており、携帯電話や
個人携帯情報端末などの半透過反射ディスプレイの伸び
が著しい。2. Description of the Related Art LCDs are used for desk computers, electronic clocks,
Used in personal computers, word processors, etc., the demand for them has been increasing rapidly in recent years, and the growth of semi-transmissive reflective displays such as mobile phones and personal digital assistants is remarkable.
【０００３】従来、ＬＣＤの表示特性を向上させるため
に、偏光板に半透過反射板を積層してなる半透過反射型
偏光板を、通常液晶セルの裏側に設け、液晶表示装置を
比較的明るい雰囲気で使用する場合には、視認側（表示
側）からの入射光を反射させて画像を表示し、比較的暗
い雰囲気で使用する場合には、半透過反射型偏光板のバ
ックサイドに内蔵されているバックライト等の内蔵光源
を使用して画像を表示する方法が採用されている。即
ち、半透過反射型偏光板は、明るい雰囲気下ではバック
ライト等の光源使用のエネルギーを節約でき、比較的暗
い雰囲気下では内蔵光源を用いて使用できるため、液晶
表示装置の形成に有用である。Conventionally, in order to improve the display characteristics of an LCD, a semi-transmissive reflection type polarizing plate in which a semi-transmissive reflection plate is laminated on a polarizing plate is usually provided on the back side of a liquid crystal cell to make a liquid crystal display device relatively bright. When used in an atmosphere, it reflects the incident light from the viewing side (display side) to display an image, and when used in a relatively dark atmosphere, it is built into the backside of the semi-transmissive reflective polarizing plate. A method of displaying an image using a built-in light source such as a backlight is adopted. That is, the semi-transmissive reflective polarizing plate is useful for forming a liquid crystal display device because it can save energy for using a light source such as a backlight in a bright atmosphere and can be used with a built-in light source in a relatively dark atmosphere. .
【０００４】ところで、時計や家電機器への組み込み表
示装置用の半透過反射液晶表示装置において、偏光板、
反射板、半透過反射板を着色し、特有の色を呈示せしめ
ることにより、視認性・意匠性の向上を図る場合があっ
た。By the way, in a semi-transmissive reflective liquid crystal display device for a built-in display device in a watch or a home electric appliance, a polarizing plate,
In some cases, the visibility and the design are improved by coloring the reflective plate and the semi-transmissive reflective plate to show a unique color.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、染料や
顔料による着色は、基本的に吸収による着色であり、明
るい表示を得るためには好ましくなかった。また、金属
蒸着半透過反射膜では、反射色／透過色ともに金属種と
成膜厚みによって色調が一義的に決定されるため、反射
板として実用可能な金属種が、銀、金、白金、クロム、
チタン、銅とそれらの合金程度と限られ、色調の自由度
は狭かった。However, coloring with dyes or pigments is basically coloring due to absorption, which is not preferable for obtaining a bright display. Further, in the metal vapor-deposited semi-transmissive reflective film, the color tone is uniquely determined by the metal species and the film thickness for both the reflection color / transmission color. ,
The degree of freedom of color tone was narrow, limited to the extent of titanium and copper and their alloys.
【０００６】そこで、本発明は、前記従来の問題を解決
するため、特定の波長の光線を反射／透過する干渉フィ
ルターを用いることにより表示を着色することができ、
また干渉フィルターは基本的に透過しない光線は反射し
吸収は行わないため吸収損失の少ない明るい表示が実現
できる、意匠性の高い半透過反射板、半透過反射板付き
偏光板を提供することを目的とする。また、それを用い
た半透過反射液晶表示装置を提供することを目的とす
る。Therefore, in order to solve the above-mentioned conventional problems, the present invention can color the display by using an interference filter that reflects / transmits a light beam of a specific wavelength,
Further, the interference filter basically provides a semi-transmissive reflection plate with high designability and a polarizing plate with a semi-transmission reflection plate that can realize a bright display with little absorption loss because it does not absorb and does not absorb light rays that do not pass through. And Moreover, it aims at providing the transflective liquid crystal display device using the same.
【０００７】[0007]
【課題を解決するための手段】前記の目的を達成するた
め、本発明の半透過反射板は、液晶表示装置に用いる半
透過反射板であって、可視光波長帯域内の特定波長域を
透過あるいは反射する干渉型半透過反射板を用いてな
り、光の吸収損失を生じることなく反射色と透過色を変
化させ、意匠性を高めたことを特徴とする。In order to achieve the above object, the semi-transmissive reflector of the present invention is a semi-transmissive reflector used in a liquid crystal display device, which transmits a specific wavelength region within a visible light wavelength band. Alternatively, it is characterized by using an interference type semi-transmissive reflection plate that reflects light, and changing the reflection color and the transmission color without causing absorption loss of light to improve the design.
【０００８】したがって、本発明の半透過反射板は、従
来の着色半透過反射板とは着色原理が全く異なるもので
あり、干渉フィルターの構造を所望の色の光を吸収ある
いは反射するように設計することにより所望の色表示を
実現することができるため、色調の選択の自由度を著し
く拡大することができる。また、干渉フィルターは基本
的に透過しない光線は反射し吸収は行わないため、吸収
損失の少ない明るい表示が実現でき、染料や顔料による
着色と比べて、明るい表示を実現できる。また、干渉フ
ィルターを用いて色を発現しているため、染料や顔料に
よる着色と比べて、経時劣化がなく、長期に亘って安定
した色調が得られるなど、種々の長所を有している。Therefore, the transflective plate of the present invention is completely different in coloring principle from the conventional colored transflective plate, and the structure of the interference filter is designed to absorb or reflect light of a desired color. By doing so, a desired color display can be realized, so that the degree of freedom in selecting a color tone can be significantly expanded. In addition, since the interference filter basically reflects a light ray that does not pass through and does not absorb the light ray, a bright display with less absorption loss can be realized, and a brighter display can be realized as compared with coloring with a dye or a pigment. Further, since the interference filter is used to develop the color, it has various advantages as compared with coloring with a dye or a pigment without deterioration over time and a stable color tone can be obtained over a long period of time.
【０００９】前記半透過反射板は、真空中での多層積層
法によって形成することができる。また、屈折率の異な
る樹脂材料が多層積層されたものであってもよい。この
場合、樹脂材料の多層積層構造は、樹脂材料の精密塗
工、または屈折率の異なる樹脂の多層押出しフィルムの
精密延伸によって形成することができ、樹脂材料として
は液晶ポリマー樹脂材料が好ましく用いられる。The semi-transmissive reflector can be formed by a multi-layer lamination method in vacuum. Alternatively, resin materials having different refractive indexes may be laminated in multiple layers. In this case, the multilayer laminated structure of the resin material can be formed by precision coating of the resin material or precision stretching of a multilayer extruded film of resins having different refractive indexes, and a liquid crystal polymer resin material is preferably used as the resin material. .
【００１０】また前記半透過反射板においては、その表
面に光拡散性を有する凹凸構造が形成されていてもよ
い。Further, the semi-transmissive reflector may have an uneven structure having light diffusivity formed on the surface thereof.
【００１１】次に、本発明の半透過反射板付き偏光板
は、前記半透過反射板と、偏光板を貼り合わせたことを
特徴とする。Next, the polarizing plate with a semi-transmissive reflection plate of the present invention is characterized in that the semi-transmissive reflection plate and the polarizing plate are bonded together.
【００１２】また、本発明の半透過反射液晶表示装置
は、前記半透過反射板または前記半透過反射板付き偏光
板を備えていることを特徴とする。Further, the semi-transmissive reflective liquid crystal display device of the present invention is characterized by including the semi-transmissive reflective plate or the polarizing plate with the semi-transmissive reflective plate.
【００１３】さらに、本発明の半透過反射板,半透過反
射板付き偏光板および半透過反射液晶表示装置には、偏
光を実質的に保存する光拡散板を組合せることができ
る。Further, the semi-transmissive reflector, the polarizing plate with the semi-transmissive reflector and the semi-transmissive reflective liquid crystal display device of the present invention can be combined with a light diffuser which substantially preserves the polarized light.
【００１４】[0014]
【発明の実施の形態】本発明の半透過反射板は、可視光
波長帯域内の特定波長域を透過あるいは反射する干渉型
半透過反射板を用いてなり、光の吸収損失を生じること
なく反射色と透過色を変化させることにより、意匠性を
高めたものである。BEST MODE FOR CARRYING OUT THE INVENTION The semi-transmissive reflector of the present invention comprises an interference type semi-transmissive reflector which transmits or reflects a specific wavelength region within the visible light wavelength band, and reflects without causing absorption loss of light. The design is enhanced by changing the color and the transmitted color.
【００１５】本発明において、特定波長は所望する色調
に合せて適宜選択すればよい。この特定の波長帯域の光
を透過し他の波長帯域の光を反射する干渉フィルターを
用いて半透過反射板を形成することにより、上記機能を
付与することができる。例えば、屈折率の異なる１／４
〜１／２波長の厚みを有する薄膜層を、２層以上多層積
層することによって、可視領域（波長400-700nm）にお
いて特定の波長帯域の光を透過あるいは反射させること
により、吸収損失の無い明るい着色を実現することが出
来る。In the present invention, the specific wavelength may be appropriately selected according to the desired color tone. The above function can be imparted by forming a semi-transmissive reflector using an interference filter that transmits light in this specific wavelength band and reflects light in other wavelength bands. For example, 1/4 with different refractive index
By stacking two or more thin film layers each having a thickness of ½ wavelength to transmit or reflect light in a specific wavelength band in the visible region (wavelength 400-700 nm), there is no absorption loss and is bright. Coloring can be realized.
【００１６】本発明の半透過反射板を、偏光板を上下２
枚用いる液晶表示装置に配置する場合は、基材上に干渉
半透過反射層を形成した後、これを下板側（バックライ
ト側）偏光板に貼り合わせて用いる。The semi-transmissive reflector of the present invention is provided with a polarizing plate at the upper and lower sides.
When it is arranged in a liquid crystal display device to be used for one sheet, after forming an interference semi-transmissive reflective layer on a substrate, it is attached to a lower plate side (backlight side) polarizing plate for use.
【００１７】前記基材としては、光透過性基材が好まし
く、プラスチックフィルム等の高分子基材やガラス板等
の無機基材を用いることができる。高分子基材として
は、例えば、ポリエチレンテルフタレート（ＰＥＴ）、
ポリカーボネート（ＰＣ）、ポリエーテルスルホン（Ｐ
ＥＳ）、ポリビニルアルコール（ＰＶＡ）、トリアセチ
ルセルロース（ＴＡＣ）等の樹脂を使用することができ
る。また、基材として液晶基板（液晶セル基板ともい
う）を使用してもよく、ガラス基板、プラスチック基板
等従来公知のものを、それぞれ用途に応じて適宜使用す
ることもできる。さらに反射偏光子と組み合わせ、光利
用効率を上げる場合には、位相差を有さない無延伸ＰＥ
Ｔ、無延伸ＰＣ、ＪＳＲ製の「ＡＲＴＯＮ」等が好適で
ある。The base material is preferably a light transmissive base material, and a polymer base material such as a plastic film or an inorganic base material such as a glass plate can be used. Examples of the polymer base material include polyethylene terephthalate (PET),
Polycarbonate (PC), polyether sulfone (P
Resins such as ES), polyvinyl alcohol (PVA) and triacetyl cellulose (TAC) can be used. Further, a liquid crystal substrate (also referred to as a liquid crystal cell substrate) may be used as the base material, and a conventionally known one such as a glass substrate or a plastic substrate may be appropriately used depending on the application. Furthermore, when combined with a reflective polarizer to increase the light utilization efficiency, unstretched PE with no phase difference
T, unstretched PC, "ARTON" manufactured by JSR, and the like are suitable.
【００１８】また、偏光板を上板（視認側）一枚しか使
わない円偏光モードの液晶表示装置に配置する場合は、
液晶セルに別途作製した干渉型半透過反射板を貼り合わ
せることができる。また、液晶表示装置のセルそのもの
の表面に干渉半透過反射層を形成することもでき、これ
により半透過反射液晶基板が形成される。この場合、干
渉半透過反射層は、液晶表示装置の液晶面側／外側面側
のどちら側に形成されていてもよい。When the polarizing plate is arranged in a circular polarization mode liquid crystal display device which uses only one upper plate (viewing side),
A separately manufactured interference type semi-transmissive reflector can be attached to the liquid crystal cell. Further, an interference semi-transmissive reflective layer can be formed on the surface of the cell itself of the liquid crystal display device, whereby a semi-transmissive reflective liquid crystal substrate is formed. In this case, the interference semi-transmissive reflective layer may be formed on either the liquid crystal surface side or the outer surface side of the liquid crystal display device.
【００１９】本発明の干渉型半透過反射板は、例えば、
真空中で金属酸化物、無機酸化物又は誘電体を多層積層
する方法によって形成することができ、光透過性を有す
る金属酸化物、無機酸化物又は誘電体の蒸着膜とするの
がよい。具体的には、一般的な干渉フィルター作成方法
である真空蒸着、スパッタリング、ＥＢ等を用いて、屈
折率の異なる薄層を厚み制御しながら上記基材上に多層
薄膜を形成することにより、多層積層体を得ることがで
きる。多層薄膜を形成しうる材料としては、例えば、Ｓ
ｉＯ2、ＭｇＦ、ＺｒＯ2−ＴｉＯ2等を挙げることがで
きる。The interference type semi-transmissive reflector of the present invention is, for example,
It can be formed by a method of laminating metal oxides, inorganic oxides or dielectrics in a vacuum, and is preferably a vapor-deposited film of metal oxides, inorganic oxides or dielectrics having optical transparency. Specifically, a multi-layer thin film is formed on the above-mentioned substrate while controlling the thickness of thin layers having different refractive indexes using vacuum deposition, sputtering, EB or the like, which is a general method for producing an interference filter. A laminated body can be obtained. As a material capable of forming a multilayer thin film, for example, S
Examples include iO 2 , MgF, ZrO 2 —TiO 2, and the like.
【００２０】また、多層積層体は、屈折率の異なる樹脂
材料を、上記基材や液晶セル基板等に精密薄層塗工して
多層薄膜を形成する方法にて得ることもできる。この場
合、樹脂材料として液晶ポリマーを用い、自発的な屈折
率差を有する内部構造の発現によって得られる干渉型半
透過反射板とすることもできる。The multi-layer laminate can also be obtained by a method for forming a multi-layer thin film by precisely coating a resin material having a different refractive index on the above-mentioned base material or liquid crystal cell substrate. In this case, a liquid crystal polymer may be used as the resin material, and an interference type semi-transmissive reflection plate obtained by exhibiting an internal structure having a spontaneous refractive index difference may be obtained.
【００２１】また、屈折率の異なる樹脂の押出し積層品
を準備し、これを精密延伸して厚みを制御する方法にて
も干渉型半透過反射板を得ることができる。The interference type semi-transmissive reflector can also be obtained by preparing an extruded laminated product of resins having different refractive indexes and precisely stretching it to control the thickness.
【００２２】このようにして得られた干渉型半透過反射
板は、干渉層を形成するために用いた基材（例えば、ガ
ラス板、ＰＥＴフィルム等）が平滑鏡面状であった場合
には鏡面反射的な性質が強く、正反射方向は明るいが斜
め方向は全く表示が見えないという、液晶表示装置用途
としては使用用途が限定される物となる。そこで、組み
合わせる偏光板との貼り合わせ面側、あるいは液晶表示
装置との貼り合わせ面側、あるいは液晶表示装置の表面
側の偏光板に、光散乱板を組み合わせることにより、光
の入射方向によらず明るい均一な表示を得ることができ
る。組み合わせる光散乱板の拡散度は、望ましくはヘイ
ズ３０％以上、さらに望ましくは４０％以上であるのが
よい。また、光散乱板がもたらす偏光度低下は５％以下
に抑えるのが望ましく、より望ましくは２％以下、さら
に望ましくは１％以下である。The interference type semi-transmissive reflector thus obtained is a mirror surface when the substrate (eg, glass plate, PET film, etc.) used for forming the interference layer has a smooth mirror surface. The liquid crystal display device has a strong reflective property and is bright in the regular reflection direction, but invisible in the oblique direction. Therefore, by combining a light-scattering plate with the polarizing plate on the bonding surface side of the polarizing plate to be combined, the bonding surface side of the liquid crystal display device, or the front surface side of the liquid crystal display device, the light scattering plate can be used regardless of the incident direction of light. A bright and uniform display can be obtained. The diffusivity of the combined light-scattering plate is preferably 30% or more for haze, and more preferably 40% or more for haze. Further, the decrease in the degree of polarization caused by the light scattering plate is preferably suppressed to 5% or less, more preferably 2% or less, and further preferably 1% or less.
【００２３】上記の光散乱板は、等方性の樹脂中に屈折
率の異なる等方性粒子を包埋することにより得ることが
できる。包埋する等方性樹脂としては、例えば、エポキ
シ樹脂、アクリル樹脂などを挙げることができる。包埋
される等方性粒子としては、例えば、ガラス球のような
無機質微粒子の他、エポキシ樹脂微粒子、アクリル樹脂
微粒子のような有機微粒子を挙げることができ、また、
包埋樹脂中に分散した油滴などを用いることもできる。The above light-scattering plate can be obtained by embedding isotropic particles having different refractive indexes in an isotropic resin. Examples of the isotropic resin to be embedded include epoxy resin and acrylic resin. Examples of the isotropic particles to be embedded include, for example, inorganic fine particles such as glass spheres, epoxy resin fine particles, and organic fine particles such as acrylic resin fine particles.
It is also possible to use oil droplets dispersed in the embedding resin.
【００２４】光拡散板を用いない場合には、干渉半透過
反射層を形成するために用いる基材フィルムとして、表
面に凹凸を有するフィルムを使用することができる。表
面凹凸形成方法としては、例えば、サンドブラスト方式
やエンボス加工方式等を挙げることができる。また、干
渉半透過反射層形成後に、金型プレスや刻印ロールによ
るエンボス加工等を施し、表面に凹凸形状を作製する手
段を用いて拡散反射特性を付与することもできる。When the light diffusing plate is not used, a film having irregularities on the surface can be used as the base film used for forming the interference semi-transmissive reflective layer. Examples of the method for forming surface irregularities include a sandblast method and an embossing method. Further, after the interference semi-transmissive reflective layer is formed, a diffused reflection characteristic can be imparted by using a means for producing an uneven shape on the surface by performing embossing with a die press or an engraving roll.
【００２５】また、本発明の干渉型半透過反射板、およ
びこれに偏光板を貼り合わせた半透過反射板付き偏光板
には、液晶セル等の部材と接着するための粘着層を設け
ることもできる。粘着層の形成に用いる粘着剤は、特に
限定はなく、例えば、アクリル系、シリコーン系、ポリ
エステル系、ポリウレタン系、ポリエーテル系、ゴム系
等の適宜なものを用いることができる。粘着層は必要に
応じて必要な面に設ければよい。粘着層の厚さについて
も、特に限定はなく、通常１０〜３０μｍである。The interference type semi-transmissive reflector of the present invention and the polarizing plate with a semi-transmissive reflector in which a polarizing plate is attached to the interference type semi-transmissive reflector may be provided with an adhesive layer for adhering to a member such as a liquid crystal cell. it can. The pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer is not particularly limited, and for example, an appropriate one such as acrylic, silicone-based, polyester-based, polyurethane-based, polyether-based, rubber-based can be used. The adhesive layer may be provided on a required surface as needed. The thickness of the adhesive layer is also not particularly limited and is usually 10 to 30 μm.
【００２６】なお、設けた粘着層が表面に露出する場合
には、その粘着層を実用に供するまでの間、汚染防止等
を目的に、セパレータ（離型フィルム）にてカバーする
ことが好ましい。セパレータは、適宜な薄葉体に、必要
に応じシリコーン系、長鎖アルキル系、フッ素系、硫化
モリブデン等の剥離剤をコートする方式などにより形成
することができる。When the provided pressure-sensitive adhesive layer is exposed on the surface, it is preferable to cover the pressure-sensitive adhesive layer with a separator (release film) until it is put into practical use for the purpose of preventing contamination. The separator can be formed by coating a suitable thin sheet with a release agent such as silicone, long-chain alkyl, fluorine, or molybdenum sulfide, if necessary.
【００２７】また、本発明の干渉型半透過反射板および
半透過反射板付き偏光板は、液晶セルのバックライト側
に配置し、従来に準じた適宜な構造を有するものとして
半透過反射液晶表示装置を形成することができる。ま
た、半透過反射液晶基板を用いる場合も、従来に準じ
て、半透過反射液晶表示装置を形成することができる。
したがって、液晶表示装置を形成する液晶セルは任意で
あり、例えば薄膜トランジスタ型に代表されるアクティ
ブマトリクス駆動型のもの、ツイストネマチック型やス
ーパーツイストネマチック型に代表される単純マトリク
ス駆動型のものなどの適宜なタイプの液晶セルを用いた
ものであってよい。The interference type semi-transmissive reflection plate and the polarizing plate with the semi-transmission reflection plate of the present invention are arranged on the backlight side of the liquid crystal cell and have a suitable structure in accordance with the prior art, and are therefore a semi-transmission reflection liquid crystal display. A device can be formed. Also, when a semi-transmissive reflective liquid crystal substrate is used, a semi-transmissive reflective liquid crystal display device can be formed in a conventional manner.
Therefore, the liquid crystal cell forming the liquid crystal display device is arbitrary, and for example, an active matrix drive type represented by a thin film transistor type, a simple matrix drive type represented by a twist nematic type or a super twist nematic type is appropriately used. Any type of liquid crystal cell may be used.
【００２８】また、半透過反射液晶表示装置の形成に際
しては、例えば位相差板（１／２波長板、１／４波長
板）や、プリズムアレイシート、レンズアレイシート等
の適宜な部品を適宜な位置に１層又は２層以上配置する
ことができる。In forming the transflective liquid crystal display device, appropriate components such as a retardation plate (1/2 wavelength plate, 1/4 wavelength plate), a prism array sheet, a lens array sheet, etc. are appropriately used. One layer or two or more layers can be arranged at the position.
【００２９】[0029]
【実施例】以下、実施例及び比較例を用いて本発明を更
に具体的に説明するが、本発明はこれらの実施例のみに
制限されるものではない。EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.
【００３０】（実施例１）ポリメチルメタクリレート
（ＰＭＭＡ）／ポリエチレンナフタレート（ＰＥＮ）の
１／４λ厚２０層積層膜の薄膜延伸フィルムからなる、
反射色が緑色を示す干渉フィルター機能を有する半透過
反射板に、ヘイズ８８％相当の拡散粘着材（光散乱板）
を貼り合わせた。この光学特性を評価するために、色差
計（スガ試験器製、カラーテスター）を用いて、Ｌ、
a、ｂ値を測定した。その結果を表１に示す。(Example 1) A thin stretched film of a 1 / 4λ thick 20-layer laminated film of polymethylmethacrylate (PMMA) / polyethylene naphthalate (PEN) was used.
A semi-transmissive reflector with an interference filter function that shows a green reflection color, and a diffusing adhesive with a haze of 88% (light scattering plate)
Pasted together. In order to evaluate this optical characteristic, a color difference meter (manufactured by Suga Test Instruments Co., Ltd., color tester) was used to measure L,
The a and b values were measured. The results are shown in Table 1.
【００３１】また、半透過反射板のスペクトル特性を、
分光光度計ＵＶ−２４００（島津製作所製）を用いて測
定したところ（図１）、反射は彩度の高い緑色を示し、
透過は彩度の高い紫色を示した。The spectral characteristics of the semi-transmissive reflector are
When measured with a spectrophotometer UV-2400 (manufactured by Shimadzu Corporation) (FIG. 1), the reflection shows a highly saturated green color,
The transmission showed a highly saturated purple color.
【００３２】尚、用いた拡散粘着材（光散乱板）は、屈
折率１．４４で粒度分布中心直径４μｍのシリカ系中実
真球微粒子を、屈折率１．４８のアクリル系粘着材中に
２５ｗｔ％混合し、２８μｍ厚に製膜して得た。得られ
た充填物含有粘着材は、ヘイズ８８％で後方散乱が２％
以下、偏光度低下は１％以下で、良好な拡散体であっ
た。The diffusion adhesive material (light scattering plate) used was silica-based solid true spherical particles having a refractive index of 1.44 and a center particle diameter of 4 μm in an acrylic adhesive material having a refractive index of 1.48. It was obtained by mixing 25 wt% and forming a film with a thickness of 28 μm. The obtained filler-containing pressure-sensitive adhesive had a haze of 88% and backscattering of 2%.
Hereafter, the degree of polarization reduction was 1% or less, which was a good diffuser.
【００３３】（実施例２）ＳｉＯ2、ＴｉＯ2の多層蒸着
膜からなる、反射色が赤色を示す干渉フィルター機能を
有する半透過反射板（図1にスペクトル特性を示す）
に、実施例１で用いたものと同じヘイズ８８％相当の拡
散粘着材（光散乱板）を貼り合わせた。この光学特性
を、実施例１と同様にして測定した。その結果を表１に
示す。これに、偏光板（日東電工製、「ＥＧＷ１２２６
ＤＵ」）を積層し液晶表示装置に貼り合わせたところ、
反射は彩度の高い赤色を示し、透過は彩度の高い青色を
示し、意匠性の高い外観が得られた。(Embodiment 2) A semi-transmissive reflector having a function of an interference filter showing a red reflection color, which is composed of a multilayer vapor deposition film of SiO 2 and TiO 2 (spectral characteristics are shown in FIG. 1).
Then, the same diffusing adhesive material (light scattering plate) as that used in Example 1 and having a haze of 88% was attached. The optical characteristics were measured in the same manner as in Example 1. The results are shown in Table 1. In addition to this, a polarizing plate (manufactured by Nitto Denko, “EGW1226
DU ”) was laminated and attached to a liquid crystal display device,
The reflection showed a highly saturated red color, and the transmission showed a highly saturated blue color, and a highly-designed appearance was obtained.
【００３４】（比較例１）オリエント化学工業製赤色染
料バリオゾールレッド３３０４Ｚを、アクリル系粘着材
中に２ｗｔ％分散して得られた着色粘着材を、２５μｍ
厚に成膜した後、これに半透過反射板付き偏光板（日東
電工製、「Ｆ４２０５Ｐ１」）に貼り合わせることで着
色半透過反射偏光板を得た。この場合、表１に示すよう
に、着色は得られるが吸収損失が大きく、反射／透過共
に明るさが低下した。Comparative Example 1 A colored adhesive material obtained by dispersing 2 wt% of red dye Variosol Red 3304Z manufactured by Orient Chemical Industry in an acrylic adhesive material was prepared to have a thickness of 25 μm.
After forming a thick film, it was attached to a polarizing plate with a semi-transmissive reflection plate (“F4205P1” manufactured by Nitto Denko) to obtain a colored semi-transmissive reflection polarizing plate. In this case, as shown in Table 1, coloring was obtained but absorption loss was large, and the brightness was reduced in both reflection and transmission.
【００３５】[0035]
【表１】 反射Ｌ値 反射a値 反射ｂ値 透過Ｌ値 透過a値 透過ｂ値 実施例１ 80.53 -45.51 41.85 35.47 98.00 -290.46 実施例２ 64.80 20.39 34.84 70.58 -35.76 -113.27比較例１ 61.18 35.71 4.55 42.68 25.14 2.55 [Table 1] Reflection L value Reflection a value Reflection b value Transmission L value Transmission a value Transmission b value Example 1 80.53 -45.51 41.85 35.47 98.00 -290.46 Example 2 64.80 20.39 34.84 70.58 -35.76 -113.27 Comparative example 1 61.18 35.71 4.55 42.68 25.14 2.55
【００３６】[0036]
【発明の効果】以上説明したとおり、本発明の半透過反
射板によれば、可視光波長帯域内の特定波長域を透過あ
るいは反射する干渉型半透過反射板を用いてなり、光の
吸収損失を生じることなく反射色と透過色を変化させて
いるため、この半透過反射板またはこの半透過反射板付
き偏光板を半透過液晶表示装置に用いることにより、可
視領域（波長400-700nm）において特定の波長帯域の光
を透過あるいは反射させることで、パネル表示の意匠性
を高めることができるとともに、吸収損失のない明るい
着色を実現することができる。As described above, according to the semi-transmissive reflector of the present invention, the interference-type semi-transmissive reflector that transmits or reflects a specific wavelength region within the visible light wavelength band is used, and the light absorption loss. Since the reflective color and the transmissive color are changed without causing the phenomenon, by using this semi-transmissive reflector or polarizing plate with this semi-transmissive reflector in a semi-transmissive liquid crystal display device, in the visible region (wavelength 400-700 nm) By transmitting or reflecting light in a specific wavelength band, the design of the panel display can be improved and bright coloring without absorption loss can be realized.
【００３７】また、本発明の半透過反射板によれば、干
渉フィルターの構造を所望の色の光を吸収あるいは反射
するように設計することにより、所望の色表示を実現す
ることができるため、色調の選択の自由度を著しく拡大
することができる。また、干渉フィルターは基本的に透
過しない光線は反射し吸収は行わないため、吸収損失の
少ない明るい表示が実現でき、染料や顔料による着色と
比べて、明るい表示を実現できる。また、干渉フィルタ
ーを用いて色を発現しているため、染料や顔料による着
色と比べて、経時劣化がなく、長期に亘って安定した色
調が得られる。Further, according to the semi-transmissive reflector of the present invention, the desired color display can be realized by designing the structure of the interference filter so as to absorb or reflect light of a desired color. The degree of freedom in selecting the color tone can be significantly expanded. In addition, since the interference filter basically reflects a light ray that does not pass through and does not absorb the light ray, a bright display with less absorption loss can be realized, and a brighter display can be realized as compared with coloring with a dye or a pigment. Further, since the interference filter is used to develop the color, it is possible to obtain a stable color tone for a long period of time without deterioration with time as compared with coloring with a dye or a pigment.
【図１】本発明の半透過反射板（干渉フィルター）の透
過特性を示す図である。FIG. 1 is a diagram showing a transmission characteristic of a semi-transmissive reflection plate (interference filter) of the present invention.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１４年２月４日（２００２．２．４）[Submission date] February 4, 2002 (2002.2.4)
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【特許請求の範囲】[Claims]
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０２Ｂ 5/30 Ｇ０２Ｂ 5/30 Ｇ０２Ｆ 1/13357 Ｇ０２Ｆ 1/13357 Ｆターム(参考） 2H042 BA02 BA12 BA20 2H048 FA04 FA05 FA15 FA22 FA24 GA04 GA05 GA11 GA18 GA24 GA33 GA34 GA61 2H049 BA02 BB63 BB66 BC22 2H091 FA08 FA15 FA32 FB02 FB06 FC07 FC12 LA30 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) G02B 5/30 G02B 5/30 G02F 1/13357 G02F 1/13357 F term (reference) 2H042 BA02 BA12 BA20 2H048 FA04 FA05 FA15 FA22 FA24 GA04 GA05 GA11 GA18 GA24 GA33 GA34 GA61 2H049 BA02 BB63 BB66 BC22 2H091 FA08 FA15 FA32 FB02 FB06 FC07 FC12 LA30
Claims (12)
って、可視光波長帯域内の特定波長域を透過あるいは反
射する干渉型半透過反射板を用いてなり、光の吸収損失
を生じることなく反射色と透過色を変化させ、意匠性を
高めたことを特徴とする半透過反射板。1. A semi-transmissive reflector used for a liquid crystal display device, comprising an interference-type semi-transmissive reflector that transmits or reflects a specific wavelength region within a visible light wavelength band, and causes light absorption loss. A semi-transmissive reflector characterized by changing the reflection color and the transmission color without changing the design.
積層法によって形成されたものである請求項１に記載の
半透過反射板。2. The transflective plate according to claim 1, wherein the interferometric transflective plate is formed by a multilayer stacking method in vacuum.
樹脂材料が多層積層されたものである請求項１に記載の
半透過反射板。3. The transflective plate according to claim 1, wherein the interferometric transflective plate is formed by laminating resin materials having different refractive indexes in multiple layers.
て形成されたものである請求項３に記載の半透過反射
板。4. The semi-transmissive reflection plate according to claim 3, wherein the multilayer laminate is formed by precision coating of a resin material.
る請求項３または４に記載の半透過反射板。5. The semi-transmissive reflector according to claim 3, wherein the resin material is a liquid crystal polymer resin material.
押出しフィルムの精密延伸によって形成されたものであ
る請求項３に記載の半透過反射板。6. The semi-transmissive reflection plate according to claim 3, wherein the multilayer laminate is formed by precision stretching of a multilayer extruded film of resins having different refractive indexes.
凸構造が形成されている請求項１〜６のいずれかに記載
の半透過反射板。7. The transflective plate according to claim 1, wherein an uneven structure having light diffusivity is formed on the surface of the transflective plate.
反射板と、偏光板を貼り合わせたことを特徴とＳｉ
Ｏ2、ＭｇＦ、ＺｒＯ2−ＴｉＯ2する半透過反射板付き
偏光板。8. A semi-transmissive reflector according to any one of claims 1 to 6 and a polarizing plate are bonded to each other.
A polarizing plate with a semi-transmissive reflector for O 2 , MgF, and ZrO 2 —TiO 2 .
反射板または請求項７に記載の半透過反射板付き偏光板
を備えていることを特徴とする半透過反射液晶表示装
置。9. A transflective liquid crystal display device, comprising the transflective plate according to claim 1 or the polarizing plate with a transflective plate according to claim 7.
散板を組み合わせた請求項１〜７のいずれかに記載の半
透過反射板。10. The transflective plate according to claim 1, further comprising a light diffusion plate that substantially preserves polarized light.
散板を組み合わせた請求項８に記載の半透過反射板付き
偏光板。11. The polarizing plate with a semi-transmissive reflection plate according to claim 8, further comprising a light diffusion plate that substantially preserves polarized light.
散板を組み合わせた請求項９に記載の半透過反射液晶表
示装置。12. The transflective liquid crystal display device according to claim 9, further comprising a light diffusion plate that substantially preserves polarized light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001379050A JP3811395B2 (en) | 2001-12-12 | 2001-12-12 | Highly designed transflective plate, polarizing plate with transflective plate, and transflective liquid crystal display device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001379050A JP3811395B2 (en) | 2001-12-12 | 2001-12-12 | Highly designed transflective plate, polarizing plate with transflective plate, and transflective liquid crystal display device using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003177399A true JP2003177399A (en) | 2003-06-27 |
| JP3811395B2 JP3811395B2 (en) | 2006-08-16 |
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ID=19186579
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|---|---|---|---|
| JP2001379050A Expired - Fee Related JP3811395B2 (en) | 2001-12-12 | 2001-12-12 | Highly designed transflective plate, polarizing plate with transflective plate, and transflective liquid crystal display device using the same |
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| Country | Link |
|---|---|
| JP (1) | JP3811395B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005194595A (en) * | 2004-01-08 | 2005-07-21 | Niigata Tlo:Kk | Method of producing structural coloring body utilizing surface ruggedness, and structural coloring body utilizing surface ruggedness |
| JP2008310267A (en) * | 2007-06-18 | 2008-12-25 | Daio Paper Corp | Light diffusing pressure-sensitive adhesive sheet |
| WO2021106743A1 (en) * | 2019-11-28 | 2021-06-03 | 日東電工株式会社 | Optical laminate and image display device |
-
2001
- 2001-12-12 JP JP2001379050A patent/JP3811395B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005194595A (en) * | 2004-01-08 | 2005-07-21 | Niigata Tlo:Kk | Method of producing structural coloring body utilizing surface ruggedness, and structural coloring body utilizing surface ruggedness |
| JP2008310267A (en) * | 2007-06-18 | 2008-12-25 | Daio Paper Corp | Light diffusing pressure-sensitive adhesive sheet |
| WO2021106743A1 (en) * | 2019-11-28 | 2021-06-03 | 日東電工株式会社 | Optical laminate and image display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3811395B2 (en) | 2006-08-16 |
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