JPH10301105A - Liquid crystal display polarizing plate and liquid crystal display device - Google Patents

Liquid crystal display polarizing plate and liquid crystal display device

Info

Publication number
JPH10301105A
JPH10301105A JP9128049A JP12804997A JPH10301105A JP H10301105 A JPH10301105 A JP H10301105A JP 9128049 A JP9128049 A JP 9128049A JP 12804997 A JP12804997 A JP 12804997A JP H10301105 A JPH10301105 A JP H10301105A
Authority
JP
Japan
Prior art keywords
liquid crystal
polarizing plate
crystal display
film
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9128049A
Other languages
Japanese (ja)
Inventor
Hideshi Kotsubo
秀史 小坪
Tetsuo Kitano
徹夫 喜多野
Makoto Sakurai
良 桜井
Takahiro Matsuse
貴裕 松瀬
Yasuhiro Morimura
泰大 森村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP9128049A priority Critical patent/JPH10301105A/en
Publication of JPH10301105A publication Critical patent/JPH10301105A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent the warpage of a liquid crystal display device as much as possible by laminating plastic barrier film which is transparent and has moisture barrier performance and whose glass transition temperature is equal to or above a specified value on the surface of a polarizing plate. SOLUTION: The polarizing plate 10 is constituted by laminating the plastic barrier film 14 on either protective film 11a of polarizing film 12 coated and protected with/by the protective films 11a and 11b through an adhesive layer 13. Then, the plastic barrier film 14 laminated is transparent and has the moisture barrier performance, and for instance polyester film and polystyrene film or the like whose glass transition temperature is >=60 deg.C are used. Also, the plastic barrier film 14 whose moisture permeability is <=500 g/m<2> .24 hours and is specially desirably <=10 g/m<2> .24 hours may be used. Thus, the polarizing plate 10 is restricted, and is made moisture-proof, so that the warpage of a cell substrate and a whole liquid crystal display device caused by the expansion and shrinkage of the polarizing film 12 is prevented as much as possible.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、液晶表示装置用偏
光板及び液晶表示装置に関し、特に液晶セル基板がプラ
スチック基板である液晶表示装置用偏光板及びそれを用
いた液晶表示装置に関する。
The present invention relates to a polarizing plate for a liquid crystal display device and a liquid crystal display device, and more particularly to a polarizing plate for a liquid crystal display device in which a liquid crystal cell substrate is a plastic substrate and a liquid crystal display device using the same.

【0002】[0002]

【従来の技術及び発明が解決しようとする課題】液晶表
示装置を構成する液晶セル基板は、従来ガラスにより形
成されていたが、最近では軽量化のためにプラスチック
製の液晶セル基板が用いられるようになってきた。
2. Description of the Related Art A liquid crystal cell substrate constituting a liquid crystal display device has conventionally been formed of glass. Recently, however, a plastic liquid crystal cell substrate has been used to reduce the weight. It has become

【0003】一方、このような液晶セルの表裏に接着さ
れる偏光板は、延伸によって偏光特性を与えたプラスチ
ック偏光フィルムを用いて形成されており、これは周囲
の温度変化、湿度変化に伴い、大きく伸縮する。
On the other hand, a polarizing plate adhered to the front and back of such a liquid crystal cell is formed by using a plastic polarizing film which has been given a polarizing property by stretching. It expands and contracts greatly.

【0004】このため、液晶セル基板がプラスチック製
の場合、このような偏光板を貼着すると、セル基板はも
とより、液晶表示装置全体が環境の変化でかなり大きく
反るという問題が生じる。
For this reason, when such a polarizing plate is adhered to a liquid crystal cell substrate made of plastic, there arises a problem that not only the cell substrate but also the entire liquid crystal display device is considerably warped due to environmental changes.

【0005】この場合、偏光板の伸縮を減少させるため
の改良等も行われているが、延伸によって偏光特性を持
たせる偏光板は、その伸縮を完全になくすことは不可能
なため、セル基板、液晶表示装置全体の反りを完全に解
消することはできない。
[0005] In this case, improvements have been made to reduce the expansion and contraction of the polarizing plate. However, it is impossible to completely eliminate the expansion and contraction of a polarizing plate having a polarizing property by stretching. However, the warpage of the entire liquid crystal display device cannot be completely eliminated.

【0006】本発明は上記事情を改善するためになされ
たもので、液晶表示装置の反りを可及的に防止すること
ができる液晶表示装置用偏光板及びそれを用いた液晶表
示装置を提供することを目的とする。
SUMMARY OF THE INVENTION The present invention has been made in order to improve the above circumstances, and provides a polarizing plate for a liquid crystal display device which can prevent the warpage of the liquid crystal display device as much as possible, and a liquid crystal display device using the same. The purpose is to:

【0007】[0007]

【課題を解決するための手段及び発明の実施の形態】本
発明は、上記目的を達成するため、液晶表示装置の液晶
セルに接着される偏光板において、該偏光板の表面に透
明で水蒸気バリア性を有し、ガラス転移温度が60℃以
上であるプラスチックバリアフィルムを積層してなるこ
とを特徴とする液晶表示装置用偏光板、及び、基板の一
面に透明電極及び配向層を介して液晶層を設けた液晶セ
ルと前記基板の他面に接着された偏光板とを具備する液
晶表示装置において、上記偏光板を用いた液晶表示装置
を提供する。この場合、上記プラスチックバリアフィル
ムの水蒸気透過度は500g/m2・24時間以下であ
ることが好ましい。
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a polarizing plate adhered to a liquid crystal cell of a liquid crystal display device, wherein a transparent water vapor barrier is provided on the surface of the polarizing plate. A polarizing plate for a liquid crystal display device, comprising a laminated plastic barrier film having a glass transition temperature of 60 ° C. or higher, and a liquid crystal layer on one surface of a substrate via a transparent electrode and an alignment layer. A liquid crystal display device comprising a liquid crystal cell provided with a polarizing plate and a polarizing plate adhered to the other surface of the substrate is provided. In this case, the plastic barrier film preferably has a water vapor permeability of 500 g / m 2 · 24 hours or less.

【0008】本発明によれば、上記構成により、上記プ
ラスチックバリアフィルムの積層で偏光板、更には液晶
セル基板が拘束され、防湿されて、後述する実施例に示
すように偏光フィルムの膨張や収縮によるセル基板、液
晶表示装置全体の反りが可及的に防止される。
According to the present invention, the polarizing plate and the liquid crystal cell substrate are restrained and moisture-proof by the lamination of the plastic barrier film and the expansion and contraction of the polarizing film as shown in the embodiments described later. As a result, warpage of the cell substrate and the entire liquid crystal display device is prevented as much as possible.

【0009】以下、本発明につき更に詳しく説明する
と、本発明の液晶表示装置用偏光板は、例えば、偏光フ
ィルムの両面を保護フィルムで被覆保護してなる偏光板
の表面、必要により表裏両面に透明プラスチックバリア
フィルムを積層したものである。
Hereinafter, the present invention will be described in more detail. The polarizing plate for a liquid crystal display device of the present invention is, for example, a polarizing plate whose both surfaces are covered and protected with protective films, and where necessary, transparent on both front and back surfaces. It is obtained by laminating plastic barrier films.

【0010】この場合、偏光フィルムは、ポリビニルア
ルコール系フィルム、エチレン−酢酸ビニル共重合体系
ケン化フィルム等の親水性高分子フィルムに、ヨウ素又
は二色性染料を吸着・配向延伸した公知のものが使用さ
れ、その厚さは通常5〜250μm、特に10〜180
μmである。
In this case, the polarizing film may be a known film obtained by adsorbing and orienting iodine or a dichroic dye on a hydrophilic polymer film such as a polyvinyl alcohol-based film or a saponified ethylene-vinyl acetate copolymer film. The thickness is usually 5 to 250 μm, particularly 10 to 180
μm.

【0011】また、その偏光フィルムを被覆保護する保
護フィルムとしては、セルロース系フィルム、ポリエス
テルフィルム、ポリアクリルフィルム、ポリカーボネー
トフィルム、ポリエーテルサルフォン等が用いられる。
この厚さは通常5〜150μm、特に10〜100μm
である。
As a protective film for covering and protecting the polarizing film, a cellulose film, a polyester film, a polyacryl film, a polycarbonate film, a polyether sulfone, or the like is used.
This thickness is usually 5 to 150 μm, especially 10 to 100 μm
It is.

【0012】上記偏光板に積層されるプラスチックバリ
アフィルムは、透明で水蒸気バリア性を有し、ガラス転
移温度が60℃以上のものが使用され、具体的にポリエ
ステルフィルム、ポリスチレンフィルム、ポリアクリロ
ニトリルフィルム、ポリカーボネートフィルム、ポリア
クリルフィルム等が挙げられる。
The plastic barrier film to be laminated on the polarizing plate is transparent and has a water vapor barrier property, and has a glass transition temperature of 60 ° C. or higher. Specifically, a polyester film, a polystyrene film, a polyacrylonitrile film, Examples include a polycarbonate film and a polyacryl film.

【0013】本発明において、このようなプラスチック
バリアフィルムの透明性は、液晶表示装置の性能保持の
点から、光線透過率が70%以上、特に90%以上のも
のが好適であり、またヘイズ値は、視認性の点から20
%以下のものが好ましい。
In the present invention, the transparency of such a plastic barrier film is preferably 70% or more, particularly 90% or more, from the viewpoint of maintaining the performance of the liquid crystal display device. Is 20 in terms of visibility.
% Or less is preferable.

【0014】また、水蒸気透過度は500g/m2・2
4時間以下、特に好ましくは10g/m2・24時間以
下であるものがよく、水蒸気透過度が高いと、梅雨時な
どにフィルムを透過した水分が偏光板に到達して反って
しまう。
The water vapor permeability is 500 g / m 2 · 2
The time is preferably 4 hours or less, particularly preferably 10 g / m 2 · 24 hours or less. If the water vapor permeability is high, moisture transmitted through the film during the rainy season or the like reaches the polarizing plate and warps.

【0015】更に、上記バリアフィルムのガラス転移温
度は60℃以上、好ましくは100℃以上であり、ガラ
ス転移温度が60℃より低いと、偏光板に対する拘束力
が劣る上、場合によっては、バリアフィルム自身が収縮
し、反りの原因ともなり得る。
Further, the barrier film has a glass transition temperature of 60 ° C. or higher, preferably 100 ° C. or higher. When the glass transition temperature is lower than 60 ° C., the binding force to the polarizing plate is inferior, and in some cases, the barrier film is inferior. It can shrink itself and cause warping.

【0016】上記バリアフィルムの厚さは、厚ければ厚
いほど水蒸気バリア性がよく、10μm以上、好ましく
は25μm以上、更に好ましくは50μm以上である
が、実用性を考慮すると、その上限は500μm、特に
200μmである。
The thickness of the barrier film is preferably 10 μm or more, preferably 25 μm or more, more preferably 50 μm or more, as the thickness is larger, but the upper limit is 500 μm in consideration of practicality. In particular, it is 200 μm.

【0017】なお、上記バリアフィルムと偏光板との積
層は、通常アクリル系、ウレタン系、エポキシ系等の接
着剤を用いて行われる。これに使用される接着剤は特に
制限されないが、光線透過率が70%以上、特に90%
以上、ヘイズ値が20%以下のものが好ましい。
The lamination of the barrier film and the polarizing plate is usually carried out using an acrylic, urethane or epoxy adhesive. The adhesive used for this purpose is not particularly limited, but has a light transmittance of 70% or more, especially 90%.
As described above, those having a haze value of 20% or less are preferable.

【0018】本発明の偏光板10は、図1に示すよう
に、保護フィルム11a,11bにより被覆保護された
偏光フィルム12の上記一方の保護フィルム11a上に
接着剤層13を介してバリアフィルム14を積層した構
成とすることができる。この場合、上記一方の保護フィ
ルム11aを設けず、上記バリアフィルム14を偏光フ
ィルム12に接着剤層13を介して積層した構成として
もよい。
As shown in FIG. 1, the polarizing plate 10 of the present invention comprises a barrier film 14 with an adhesive layer 13 interposed therebetween on the one protective film 11a of the polarizing film 12 covered and protected by the protective films 11a and 11b. Can be laminated. In this case, the barrier film 14 may be laminated on the polarizing film 12 via the adhesive layer 13 without providing the one protective film 11a.

【0019】本発明の液晶表示装置は、図2に示すよう
に、一面に透明電極3,3’及び配向層4,4’を有す
る2枚の基板2,2’を配向層4,4’が対向するよう
に配置し、それらの間に液晶層5を介在させた液晶セル
1と、その一方の基板2の他面に積層された偏光板10
と、他方の基板2’の他面に積層された半透過半反射偏
光板又は反射偏光板又は検光板6とを具備するものであ
り、この偏光板10として図1に示した表面に上記バリ
アフィルム14が積層された偏光板10を配設したもの
である。
As shown in FIG. 2, the liquid crystal display of the present invention comprises two substrates 2, 2 'each having a transparent electrode 3, 3' and an alignment layer 4, 4 'on one surface. Are disposed so as to face each other, and a liquid crystal cell 1 having a liquid crystal layer 5 interposed therebetween and a polarizing plate 10 laminated on the other surface of one of the substrates 2.
And a transflective / reflective polarizer, a reflective polarizer, or an analyzer plate 6 laminated on the other surface of the other substrate 2 ′. The polarizing plate 10 on which the film 14 is laminated is provided.

【0020】[0020]

【実施例】以下、実施例と比較例を示し、本発明を具体
的に説明するが、本発明は下記の実施例に制限されるも
のではない。
EXAMPLES The present invention will be described below in detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.

【0021】〔実施例〕偏光板として日本合成化学工業
(株)製PLN−12432Z,厚さ120μmのもの
を使用し、これにアクリル系粘着剤を用いて表1に示す
フィルムA,B,Cを接着し、偏光板を得た。
[Examples] As a polarizing plate, PLN-12432Z manufactured by Nippon Synthetic Chemical Industry Co., Ltd., having a thickness of 120 μm, was used, and an acrylic pressure-sensitive adhesive was used for the films A, B, and C shown in Table 1. Were adhered to obtain a polarizing plate.

【0022】これを液晶セル、半透過半反射偏光板と組
み合わせ、図2に示すようなフィルム状液晶表示装置を
得た。この場合、液晶セル、半透過半反射偏光板の仕様
は下記の通りであり、これらの接着にはいずれもアクリ
ル系粘着剤を使用した。
This was combined with a liquid crystal cell and a transflective polarizing plate to obtain a film-like liquid crystal display device as shown in FIG. In this case, the specifications of the liquid crystal cell and the transflective polarizing plate were as follows, and an acrylic pressure-sensitive adhesive was used for bonding these.

【0023】[0023]

【表1】 液晶セル:基板 藤森工業(株)製 アモレックス A
M 3015 E厚さ 320μm 半透過半反射偏光板:日本合成化学工業(株)製PUN
−12450 HR Z
[Table 1] Liquid crystal cell: Substrate Fujimori Kogyo Co., Ltd. Amorex A
M 3015 E thickness 320 μm transflective polarizing plate: PUN manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
-12450 HR Z

【0024】〔比較例〕実施例におけるフィルムA,
B,Cを上記偏光板に貼り合わせなかった以外は、実施
例と同様のフィルム状液晶表示装置を作製した。
COMPARATIVE EXAMPLE Films A,
Except that B and C were not bonded to the polarizing plate, a film-like liquid crystal display device similar to that of the example was produced.

【0025】次に、上記フィルム状液晶表示装置を環境
試験機に投入し、表2に示す環境条件下に放置した後、
フィルム状液晶表示装置の一端を押えた場合、他端が何
mm持ち上がるかを測定することにより、反りを評価し
た。結果を表2に示す。
Next, the film-form liquid crystal display device was put into an environmental tester, left under the environmental conditions shown in Table 2, and
When one end of the film-like liquid crystal display device was pressed, the warpage was evaluated by measuring how many mm the other end lifted. Table 2 shows the results.

【0026】本実施例では、半透過半反射偏光板を用い
たが、そのかわりに反射偏光板を用いても同様の効果が
得られた。
In this embodiment, a transflective polarizing plate is used. However, a similar effect can be obtained by using a reflective polarizing plate instead.

【0027】[0027]

【表2】 [Table 2]

【0028】[0028]

【発明の効果】本発明の偏光板を用いることにより、フ
ィルム状液晶表示装置の反りを防止することができる。
By using the polarizing plate of the present invention, warpage of the liquid crystal display device can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施例に係る偏光板の断面図であ
る。
FIG. 1 is a sectional view of a polarizing plate according to one embodiment of the present invention.

【図2】本発明の一実施例に係る偏光板を貼着した液晶
表示装置の一例を示す断面図である。
FIG. 2 is a cross-sectional view illustrating an example of a liquid crystal display device to which a polarizing plate according to one embodiment of the present invention is attached.

【符号の説明】[Explanation of symbols]

1 液晶セル 2,2’基板 3,3’透明電極 4,4’配向層 5 液晶層 6 半透過半反射偏光板 10 偏光板 11a,11b 保護フィルム 12 偏光フィルム 13 接着剤層 14 バリアフィルム DESCRIPTION OF SYMBOLS 1 Liquid crystal cell 2, 2 'substrate 3, 3' transparent electrode 4, 4 'orientation layer 5 Liquid crystal layer 6 Transflective transflective polarizing plate 10 Polarizing plate 11a, 11b Protective film 12 Polarizing film 13 Adhesive layer 14 Barrier film

───────────────────────────────────────────────────── フロントページの続き (72)発明者 松瀬 貴裕 東京都小平市小川東町3−1−1 株式会 社ブリヂストン内 (72)発明者 森村 泰大 東京都小平市小川東町3−1−1 株式会 社ブリヂストン内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takahiro Matsuse 3-1-1, Ogawa-Higashi-cho, Kodaira-shi, Tokyo Inside Bridgestone Corporation (72) Inventor Yasuhiro Morimura 3-1-1, Ogawa-Higashi-cho, Kodaira-shi, Tokyo Inside Bridgestone

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 液晶表示装置の液晶セルに接着される偏
光板において、該偏光板の表面に透明で水蒸気バリア性
を有し、ガラス転移温度が60℃以上であるプラスチッ
クバリアフィルムを積層してなることを特徴とする液晶
表示装置用偏光板。
1. A polarizing plate to be bonded to a liquid crystal cell of a liquid crystal display device, wherein a plastic barrier film having a transparent and water vapor barrier property and a glass transition temperature of 60 ° C. or higher is laminated on the surface of the polarizing plate. A polarizing plate for a liquid crystal display device.
【請求項2】 上記プラスチックバリアフィルムの水蒸
気透過度が500g/m2・24時間以下であることを
特徴とする請求項1記載の液晶表示装置用偏光板。
2. The polarizing plate for a liquid crystal display device according to claim 1, wherein the water vapor permeability of the plastic barrier film is 500 g / m 2 · 24 hours or less.
【請求項3】 基板の一面に透明電極及び配向層を介し
て液晶層を設けた液晶セルと前記基板の他面に接着され
た偏光板とを具備する液晶表示装置において、請求項1
又は2記載の偏光板を用いたことを特徴とする液晶表示
装置。
3. A liquid crystal display device comprising: a liquid crystal cell having a liquid crystal layer provided on one surface of a substrate via a transparent electrode and an alignment layer; and a polarizing plate adhered to the other surface of the substrate.
Or a liquid crystal display device using the polarizing plate according to 2.
JP9128049A 1997-05-01 1997-05-01 Liquid crystal display polarizing plate and liquid crystal display device Pending JPH10301105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9128049A JPH10301105A (en) 1997-05-01 1997-05-01 Liquid crystal display polarizing plate and liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9128049A JPH10301105A (en) 1997-05-01 1997-05-01 Liquid crystal display polarizing plate and liquid crystal display device

Publications (1)

Publication Number Publication Date
JPH10301105A true JPH10301105A (en) 1998-11-13

Family

ID=14975242

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9128049A Pending JPH10301105A (en) 1997-05-01 1997-05-01 Liquid crystal display polarizing plate and liquid crystal display device

Country Status (1)

Country Link
JP (1) JPH10301105A (en)

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EP1237017A1 (en) * 2001-02-20 2002-09-04 Fuji Photo Film Co., Ltd. Polarizing plate protection film
US6833953B2 (en) 2001-03-29 2004-12-21 Seiko Epson Corporation Polarizer and optical device using the polarizer
JP2008512273A (en) * 2004-09-13 2008-04-24 シルク・ディスプレイズ High performance composite materials for plastic substrates
TWI403763B (en) * 2004-05-11 2013-08-01 Nitto Denko Corp Polarizing element protective film, polarizing element and image display device
JP2016145992A (en) * 2008-12-30 2016-08-12 スリーエム イノベイティブ プロパティズ カンパニー Antireflective articles and methods of making the same
US9908772B2 (en) 2008-12-30 2018-03-06 3M Innovative Properties Company Nanostructured articles and methods of making nanostructured articles

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JP2000356715A (en) * 1999-04-13 2000-12-26 Lg Philips Lcd Co Ltd Polalizer integrated with transparent conductive film, touch panel integrated with the polarizer and flat panel display integrated with the touch panel
EP1237017A1 (en) * 2001-02-20 2002-09-04 Fuji Photo Film Co., Ltd. Polarizing plate protection film
US6833953B2 (en) 2001-03-29 2004-12-21 Seiko Epson Corporation Polarizer and optical device using the polarizer
US7085051B2 (en) 2001-03-29 2006-08-01 Seiko Epson Corporation Polarizer and optical device using the polarizer
TWI403763B (en) * 2004-05-11 2013-08-01 Nitto Denko Corp Polarizing element protective film, polarizing element and image display device
JP2008512273A (en) * 2004-09-13 2008-04-24 シルク・ディスプレイズ High performance composite materials for plastic substrates
JP2016145992A (en) * 2008-12-30 2016-08-12 スリーエム イノベイティブ プロパティズ カンパニー Antireflective articles and methods of making the same
US9908772B2 (en) 2008-12-30 2018-03-06 3M Innovative Properties Company Nanostructured articles and methods of making nanostructured articles
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