JP2005301271A - Optical film and its use - Google Patents

Optical film and its use Download PDF

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Publication number
JP2005301271A
JP2005301271A JP2005110247A JP2005110247A JP2005301271A JP 2005301271 A JP2005301271 A JP 2005301271A JP 2005110247 A JP2005110247 A JP 2005110247A JP 2005110247 A JP2005110247 A JP 2005110247A JP 2005301271 A JP2005301271 A JP 2005301271A
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Prior art keywords
optical film
film according
support
resin
inorganic particles
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Tsu-Ii Uu
ウー，ツ−イー
Ran Rin Fusu
リン フス，ラン
Jun-Tein Wan
ワン，ジュン−ティン
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Eternal Materials Co Ltd
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Eternal Chemical Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/003—Light absorbing 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
    • G02F1/133528—Polarisers

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method by which brightness performance of liquid crystal display is improved without changing design or die relative to brightness as regards a reflective film. <P>SOLUTION: In an optical film having a support, inorganic particle-containing coating is applied on at least one surface of the support. Inorganic particles to be used require no special condition when the particles have ultraviolet ray absorptivity, and as kinds of suitable inorganic particles, zinc oxide, silicon dioxide, titanium dioxide, aluminum oxide, calcium sulfate, barium sulfate, calcium carbonate, and those mixture are listed up. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、支持体の少なくとも一表面に無機粒子含有コーティングが施されていることを特徴とする、支持体を有する光学フィルムに関する。本発明に係る光学フィルムは、液晶ディスプレイ内の反射シートに用いて液晶ディスプレイの輝度パフォーマンス（性能）を向上させることができる。   The present invention relates to an optical film having a support, wherein an inorganic particle-containing coating is applied to at least one surface of the support. The optical film according to the present invention can be used for a reflective sheet in a liquid crystal display to improve the luminance performance (performance) of the liquid crystal display.

液晶ディスプレイ（ＬＣＤ）の画像形成は、バックライト源から投射される光源の利用を含む。光源は偏光シートを通過し、次いで液晶分子群を通過する。この時、液晶分子個々の配列によって、液晶を通過する光の角度が変わる。その後、光はカラーフィルターと別の偏光シートとを通過する。よって、液晶分子群を刺激する電圧を変化させることで光の最大強度と色を調節でき、その結果、明暗が異なる様々な色の組合せが得られる。   Liquid crystal display (LCD) image formation involves the use of a light source projected from a backlight source. The light source passes through the polarizing sheet and then passes through the liquid crystal molecule group. At this time, the angle of light passing through the liquid crystal changes depending on the arrangement of the liquid crystal molecules. Thereafter, the light passes through the color filter and another polarizing sheet. Therefore, the maximum intensity and color of light can be adjusted by changing the voltage that stimulates the liquid crystal molecule group, and as a result, various color combinations with different brightness and darkness can be obtained.

液晶ボックスとカラーフィルターの光の透過率に加え、更に重要な点はＬＣＤの輝度がバックライト源の輝度に依存するという点である。よって、ＬＣＤの輝度を高めるために、より効果的なアプローチはバックライト源の輝度を高めることである。   In addition to the light transmittance of the liquid crystal box and the color filter, the more important point is that the brightness of the LCD depends on the brightness of the backlight source. Thus, to increase the brightness of the LCD, a more effective approach is to increase the brightness of the backlight source.

ＬＣＤの表示輝度を高めるためには、バックライト源を表示機能を果す一要素として利用するだけでなくＬＣＤの輝度源としても利用することが重要である。本発明に先立ち、ＬＣＤの表示輝度を改善するためのバックライト源の変更に関連した多くの方法が提案されてきた。例えば、ランプの数を増やす及び／又はランプ源のパワーを大きくすることで表示輝度を改善することが提案されてきた。しかしながら、こうしたアプローチは嵩高さや電力浪費問題に関連する種々の問題点を免れ得ない。輝度はまた、ライトガイドシートに変更を加えることによっても改善し得るであろう。しかしながら、このアプローチをとる場合にはマテリアルデザインに関連する様々な困難に遭遇するであろう。   In order to increase the display brightness of the LCD, it is important not only to use the backlight source as an element that performs the display function, but also to use it as the brightness source of the LCD. Prior to the present invention, many methods have been proposed in connection with changing the backlight source to improve the display brightness of the LCD. For example, it has been proposed to improve display brightness by increasing the number of lamps and / or increasing the power of the lamp source. However, such an approach is subject to various problems associated with bulkiness and power waste problems. The brightness could also be improved by making changes to the light guide sheet. However, when taking this approach, you will encounter various difficulties associated with material design.

反射フィルムをバックライト源に適用することで発光効率が向上し、延いては光源の輝度も上昇する。よって、反射フィルムはＬＣＤの重要な一要素である。反射フィルムの反射率は表示輝度パフォーマンスに影響する。   By applying the reflective film to the backlight source, the light emission efficiency is improved, and the luminance of the light source is also increased. Thus, the reflective film is an important element of the LCD. The reflectivity of the reflective film affects the display brightness performance.

更に、バックライト源から発せられる光はＵＶ光を含み、このＵＶ光は反射フィルムに用いられているポリマー樹脂を黄変させる。その結果、反射フィルムの反射能が低下し、ＬＣＤ内に色の違いを引き起こす。現時点で、この問題を解決する一解決策は、ＵＶ吸収剤の層を反射フィルムに適用することである。しかしながら、ＵＶ吸収剤の量が不十分だと、黄変防止効果は限定的なものとなってしまう。一方、ＵＶ吸収剤の量が増大すると、反射フィルムの接着に悪影響を及ぼすであろう。   Furthermore, the light emitted from the backlight source contains UV light, which causes the polymer resin used in the reflective film to yellow. As a result, the reflectivity of the reflective film is reduced, causing a color difference in the LCD. At present, one solution to solve this problem is to apply a layer of UV absorber to the reflective film. However, when the amount of the UV absorber is insufficient, the yellowing prevention effect is limited. On the other hand, increasing the amount of UV absorber will adversely affect the adhesion of the reflective film.

本願発明者らは、反射フィルムの（一以上の）表面に無機粒子含有コーティングを適用することで反射フィルムの接着が悪影響を受けず、バックライト源からのＵＶ光の大部分を吸収でき、反射フィルムの寿命をより長くでき、また反射フィルムの厚さを減少させることができることを見い出した。この光学フィルムを用いれば、輝度に関連する設計変更やダイスの変更を行わずに、ＬＣＤの輝度を高めることができ、本技術分野において遭遇する上述の欠点を排除できるであろう。   By applying the inorganic particle-containing coating to the (one or more) surfaces of the reflective film, the inventors of the present application can absorb most of the UV light from the backlight source without adversely affecting the adhesion of the reflective film. It has been found that the lifetime of the film can be increased and the thickness of the reflective film can be reduced. With this optical film, the brightness of the LCD can be increased without making design changes or dice changes related to brightness, which would eliminate the above-mentioned drawbacks encountered in the art.

本発明の一目的は、支持体の少なくとも一表面に無機粒子含有コーティングが施されていることを特徴とする、支持体を有する光学フィルムを提供することである。   One object of the present invention is to provide an optical film having a support, wherein an inorganic particle-containing coating is applied to at least one surface of the support.

本発明の他の一目的は、液晶ディスプレイの輝度パフォーマンスを向上させる方法を提供することである。   Another object of the present invention is to provide a method for improving the luminance performance of a liquid crystal display.

本発明の支持体を有する光学フィルムは、支持体の表面のうち少なくとも一表面に無機粒子含有コーティングが施されていることを特徴とする。   The optical film having the support of the present invention is characterized in that an inorganic particle-containing coating is applied to at least one surface of the support.

本発明で用いる無機粒子は、ＵＶ吸収性を有してさえいれば、その他特段の条件はない。適切な無機粒子の種類としては、酸化亜鉛、二酸化ケイ素、二酸化チタン、酸化アルミニウム、硫酸カルシウム、硫酸バリウム、炭酸カルシウム、及びそれらの混合物が挙げられるが、これらに限定されるものではない。無機粒子の粒子径は通常１〜１００ナノメートル、好ましくは２０〜５０ナノメートルである。   As long as the inorganic particles used in the present invention have UV absorption, there are no other special conditions. Suitable types of inorganic particles include, but are not limited to, zinc oxide, silicon dioxide, titanium dioxide, aluminum oxide, calcium sulfate, barium sulfate, calcium carbonate, and mixtures thereof. The particle diameter of the inorganic particles is usually 1 to 100 nanometers, preferably 20 to 50 nanometers.

本発明の光学フィルムに用いるのに適切な支持体は当業者には明らかである。一般に、支持体は少なくとも一層のポリマー樹脂層を含む。適切なポリマー樹脂の例としては、ポリエチレン（ＰＥ）やポリプロピレン（ＰＰ）等のポリオレフィン樹脂；ポリエチレンテレフタレート（ＰＥＴ）等のポリエステル樹脂；ポリメチルメタクリレート（ＰＭＭＡ）等のポリアクリレート樹脂；ポリカーボネート樹脂；ポリウレタン樹脂；及びそれらの混合物が挙げられるが、これらに限定されるものではない。本発明の実施態様では、光学フィルムはポリエステル樹脂の支持体を含む。好ましくは、前記ポリエステル樹脂はポリエチレンテレフタレートである。本発明の光学フィルムの支持体には、当業者に周知の無機粒子を更に任意に含有させることもでき、これらの例としては酸化亜鉛、二酸化ケイ素、二酸化チタン、酸化アルミニウム、硫酸カルシウム、硫酸バリウム、炭酸カルシウム、及びそれらの混合物が挙げられる。本発明の別の実施態様においては、本発明に用いる支持体は多層支持体であり、その内の一以上の層に前記無機粒子を含有する。詳しくは、例えば本発明に用いる支持体は三層構造の支持体で、その中間の層に前記無機粒子を含有する。   Suitable supports for use in the optical films of the present invention will be apparent to those skilled in the art. In general, the support comprises at least one polymer resin layer. Examples of suitable polymer resins include polyolefin resins such as polyethylene (PE) and polypropylene (PP); polyester resins such as polyethylene terephthalate (PET); polyacrylate resins such as polymethyl methacrylate (PMMA); polycarbonate resins; polyurethane resins And mixtures thereof, but are not limited thereto. In an embodiment of the invention, the optical film comprises a polyester resin support. Preferably, the polyester resin is polyethylene terephthalate. The support of the optical film of the present invention may further optionally contain inorganic particles well known to those skilled in the art. Examples thereof include zinc oxide, silicon dioxide, titanium dioxide, aluminum oxide, calcium sulfate, and barium sulfate. , Calcium carbonate, and mixtures thereof. In another embodiment of the present invention, the support used in the present invention is a multilayer support, and the inorganic particles are contained in one or more layers thereof. Specifically, for example, the support used in the present invention is a support having a three-layer structure, and contains the inorganic particles in an intermediate layer.

本発明における（一以上の）支持体表面のコーティングには、当業者に知られている一種以上の添加剤、例えば、蛍光輝度向上剤又はＵＶ吸収剤、あるいはそれらの混合物、を任意に含有させることもできる。   The coating on the surface (s) of the support in the present invention optionally contains one or more additives known to those skilled in the art, such as fluorescent brightness enhancers or UV absorbers, or mixtures thereof. You can also.

本発明に用いることができる適切なＵＶ吸収剤は当業者には明らかであり、その例としては、ベンゾトリアゾール類、ベンゾトリアジン類、ベンゾフェノン類、及びサリチル酸誘導体が挙げられるが、これらに限定されるものではない。   Suitable UV absorbers that can be used in the present invention will be apparent to those skilled in the art, examples of which include, but are not limited to, benzotriazoles, benzotriazines, benzophenones, and salicylic acid derivatives. It is not a thing.

本発明で用いることができる適切な蛍光輝度向上剤は当業者には明らかであり、その例としては、ベンゾオキサゾール類、ベンズイミダゾール類、及びジフェニルエチレンビストリアジン類が挙げられるが、これらに限定されるものではない。   Suitable fluorescent brightness enhancers that can be used in the present invention will be apparent to those skilled in the art, examples of which include, but are not limited to, benzoxazoles, benzimidazoles, and diphenylethylenebistriazines. It is not something.

本発明の光学フィルムは反射フィルムとして用いることができる。よって、本発明は更に、液晶ディスプレイの輝度パフォーマンスを向上させる方法にも関する。その方法は、液晶ディスプレイの輝度パフォーマンスを高めるため、本明細書に開示する光学フィルムを液晶ディスプレイのバックライト源のための反射フィルムとして利用することを含む。   The optical film of the present invention can be used as a reflective film. Thus, the present invention further relates to a method for improving the luminance performance of a liquid crystal display. The method includes utilizing the optical film disclosed herein as a reflective film for a backlight source of a liquid crystal display to enhance the luminance performance of the liquid crystal display.

以下、実施例によって本発明をより詳細に説明する。しかし、これら実施例は本発明の範囲を何ら限定するものではない。当業者によって容易になされ得る、本発明へのいかなる変更や改変も本明細書の開示及び添付の請求項に記載の範囲に包含される。   Hereinafter, the present invention will be described in more detail with reference to examples. However, these examples do not limit the scope of the present invention. Any changes or modifications to the present invention that may be easily made by those skilled in the art are encompassed by the disclosure of the present specification and the scope of the appended claims.

実施例１
メタクリレート樹脂１２６．６ｇ（固形分：約６０％）を、１０００ｒｐｍで攪拌しながらメチルエチルケトン／トルエン（４５ｇ／４５ｇ）の混合物に加えた。続いて、酸化亜鉛／二酸化チタン／硫酸バリウムの各７５ｎｍ粒子（総量３ｇ）と硬化剤ｄｅｓｍｏｄｕｒ３３９０（バイエル社の市販品）１８．４ｇを得られた混合液に順次添加し、コーティング（２５０．０ｇ、固形分：４０％）を生成した。得られたコーティングを支持体ＵＸ-１５０（テイジン社の市販品）上に塗布した。乾燥すると、１０μｍのフィルムが支持体上に形成された。７日間放置後、この支持体についてウェザリングテスト（ＱＵＶウェザリングテスター使用、Ｑパネル社）を行い、露光時間を変えて曝露したフィルムの黄変指数（ＹＩ）を評価した。テスト結果を表１に示す。 Example 1
126.6 g of methacrylate resin (solid content: about 60%) was added to a mixture of methyl ethyl ketone / toluene (45 g / 45 g) with stirring at 1000 rpm. Subsequently, each 75 nm particle (total amount 3 g) of zinc oxide / titanium dioxide / barium sulfate and 18.4 g of a curing agent desmodur 3390 (commercial product of Bayer) were sequentially added to the obtained mixed liquid, and coating (250.0 g, Solid content: 40%). The resulting coating was applied onto a support UX-150 (commercially available from Teijin). Upon drying, a 10 μm film was formed on the support. After standing for 7 days, the support was subjected to a weathering test (using QUV weathering tester, Q Panel), and the yellowing index (YI) of the exposed film was evaluated by changing the exposure time. The test results are shown in Table 1.

実施例２
Ｅ６０Ｌ（東レの市販品）を支持体として用いた以外は同様にして、実施例１の手順を繰り返した。得られたフィルムのウェザリングテストの結果を表１に示す。 Example 2
The procedure of Example 1 was repeated in the same manner except that E60L (Toray's commercial product) was used as a support. Table 1 shows the results of the weathering test of the obtained film.

比較例１
酸化亜鉛／二酸化チタン／硫酸バリウムの各７５ｎｍ粒子（３ｇ）に代え、３ｇの有機ＵＶ吸収剤（Ｔｉｎｕｖｉｎ Ｐ、チバ社の市販品）を使用したこと以外は同様にして実施例１の手順を繰り返した。得られたフィルムのウェザリングテストの結果を表１に示す。 Comparative Example 1
The procedure of Example 1 was repeated in the same manner except that 3 g of organic UV absorber (Tinvin P, commercially available from Ciba) was used instead of each 75 nm particle (3 g) of zinc oxide / titanium dioxide / barium sulfate. It was. Table 1 shows the results of the weathering test of the obtained film.

表１のデータによると、支持体が異なっても無機粒子が含有されていると、得られる光学フィルムは実質上、同等の抗黄変性を有する。   According to the data in Table 1, when inorganic particles are contained even if the supports are different, the obtained optical film has substantially the same anti-yellowing property.

表１のデータによると、無機粒子含有光学フィルムはＵＶ吸収剤を含有するフィルムより高い抗黄変性を有する。そのため、本発明の光学フィルムは、より広範な分野で用いることができる。

According to the data in Table 1, the inorganic particle-containing optical film has a higher anti-yellowing property than the film containing the UV absorber. Therefore, the optical film of the present invention can be used in a wider range of fields.

Claims (14)

支持体の少なくとも一表面に無機粒子含有コーティングが施されていることを特徴とする、支持体を有する光学フィルム。   An optical film having a support, wherein an inorganic particle-containing coating is applied to at least one surface of the support. 反射フィルムとして使用するための、請求項１に記載の光学フィルム。   The optical film according to claim 1 for use as a reflective film. 無機粒子が酸化亜鉛、二酸化ケイ素、二酸化チタン、酸化アルミニウム、硫酸カルシウム、硫酸バリウム、炭酸カルシウム、及びそれらの混合物から成る群から選択されるものである、請求項１に記載の光学フィルム。   The optical film according to claim 1, wherein the inorganic particles are selected from the group consisting of zinc oxide, silicon dioxide, titanium dioxide, aluminum oxide, calcium sulfate, barium sulfate, calcium carbonate, and mixtures thereof. 無機粒子が１〜１００ｎｍの直径を有するものである、請求項１に記載の光学フィルム。   The optical film according to claim 1, wherein the inorganic particles have a diameter of 1 to 100 nm. 無機粒子が２０〜５０ｎｍの直径を有するものである、請求項４に記載の光学フィルム。   The optical film according to claim 4, wherein the inorganic particles have a diameter of 20 to 50 nm. 前記支持体が少なくとも一層のポリマー樹脂層を含むものである、請求項１に記載の光学フィルム。   The optical film according to claim 1, wherein the support comprises at least one polymer resin layer. ポリマー樹脂が、ポリエステル樹脂、ポリアクリレート樹脂、ポリオレフィン樹脂、ポリカーボネート樹脂、ポリウレタン樹脂、及びそれらの混合物から成る群から選択されるものである、請求項６に記載の光学フィルム。   The optical film according to claim 6, wherein the polymer resin is selected from the group consisting of a polyester resin, a polyacrylate resin, a polyolefin resin, a polycarbonate resin, a polyurethane resin, and a mixture thereof. 前記ポリエステル樹脂がポリエチレンテレフタレートである、請求項７に記載の光学フィルム。   The optical film according to claim 7, wherein the polyester resin is polyethylene terephthalate. 前記ポリアクリレート樹脂がポリメチルメタクリレートである、請求項７に記載の光学フィルム。   The optical film according to claim 7, wherein the polyacrylate resin is polymethyl methacrylate. 前記ポリオレフィン樹脂がポリエチレン又はポリプロピレンである、請求項７に記載の光学フィルム。   The optical film according to claim 7, wherein the polyolefin resin is polyethylene or polypropylene. 前記支持体が更に無機物質を含むものである、請求項１に記載の光学フィルム。   The optical film according to claim 1, wherein the support further contains an inorganic substance. 前記無機物質が、酸化亜鉛、二酸化ケイ素、二酸化チタン、酸化アルミニウム、硫酸カルシウム、硫酸バリウム、炭酸カルシウム、及びそれらの混合物から成る群から選択されるものである、請求項１１に記載の光学フィルム。   The optical film according to claim 11, wherein the inorganic substance is selected from the group consisting of zinc oxide, silicon dioxide, titanium dioxide, aluminum oxide, calcium sulfate, barium sulfate, calcium carbonate, and mixtures thereof. 前記コーティングが更に蛍光輝度向上剤、ＵＶ吸収剤、又はそれらの混合物を含むものである、請求項１に記載の光学フィルム。   The optical film according to claim 1, wherein the coating further comprises a fluorescent brightness enhancer, a UV absorber, or a mixture thereof. 請求項１に記載の光学フィルムを液晶ディスプレイのバックライト源のための反射フィルムとして用いることを含むものである、液晶ディスプレイの輝度パフォーマンスを向上させる方法。


A method for improving the luminance performance of a liquid crystal display, comprising using the optical film according to claim 1 as a reflective film for a backlight source of a liquid crystal display.


JP2005110247A 2004-04-06 2005-04-06 Optical film and its use Pending JP2005301271A (en)

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