JP3166774B2 - Manufacturing method of elliptically polarizing plate - Google Patents
Manufacturing method of elliptically polarizing plateInfo
- Publication number
- JP3166774B2 JP3166774B2 JP24479590A JP24479590A JP3166774B2 JP 3166774 B2 JP3166774 B2 JP 3166774B2 JP 24479590 A JP24479590 A JP 24479590A JP 24479590 A JP24479590 A JP 24479590A JP 3166774 B2 JP3166774 B2 JP 3166774B2
- Authority
- JP
- Japan
- Prior art keywords
- polarizing plate
- plate
- elliptically polarizing
- manufacturing
- phase difference
- 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.)
- Expired - Lifetime
Links
Landscapes
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、表示特性にすぐれる楕円偏光板の製造方法
に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an elliptically polarizing plate having excellent display characteristics.
＜従来の技術＞ STN（Super Twisted Nematic）液晶の複屈折性を利用
した高コントラストな液晶ディスプレイを用いて、パソ
コンやワープロなどにおける画面の大型化が達成されて
いる。かかるディスプレイはSTN液晶の複屈折性にもと
づく楕円偏光で、偏光板を介した表示が一般に黄色系統
ないし青色系統に着色するので、STN液晶の複屈折によ
る位相差を補償するために、液晶セルと偏光板との間に
複屈折性フイルムからなる位相差板を介在させる方法が
提案されている。かかる方法はＦ−STN方式と呼ばれ、
補償セルを重ね合わせるＤ−STN方式の嵩高や高重量を
解消している。しかしＦ−STN方式は、薄膜状の高分子
フイルムによって複屈折性をコントロールするものであ
るため、偏光板と積層する場合にフイルム相互の積層、
加工等の製造条件によってそれらフイルムの光学的特性
が左右され、それを組み込んだディスプレイの表示特性
が大きな影響を受けるものである。<Prior Art> The use of a high-contrast liquid crystal display utilizing the birefringence of STN (Super Twisted Nematic) liquid crystal has realized the enlargement of screens in personal computers and word processors. Such a display is elliptically polarized light based on the birefringence of the STN liquid crystal, and the display via the polarizing plate is generally colored yellow or blue.Therefore, in order to compensate for the phase difference due to the birefringence of the STN liquid crystal, a liquid crystal cell is used. A method of interposing a retardation plate made of a birefringent film between a polarizing plate and a polarizing plate has been proposed. Such a method is called an F-STN method,
It eliminates the bulk and weight of the D-STN system in which compensation cells are superimposed. However, the F-STN method controls the birefringence by a thin film polymer film.
The optical characteristics of these films are affected by manufacturing conditions such as processing, and the display characteristics of a display incorporating the films are greatly affected.
＜発明が解決しようとする課題＞ 例えば、本発明者らの知見によると、偏光板と位相差
板とを積層して製品サイズの楕円偏光板を製造するにあ
たっては、その貼り合わせの際に発生する応力によって
位相差板の位相差が変化する。このような位相差の変化
は貼り合わせに使用する接着剤によって固定化され、残
留歪みとなって位相差異常を起生するので、この様な楕
円偏光板を液晶ディスプレイとして実装すると、色ムラ
を生じて、均一な白黒表示が得られない。<Problems to be Solved by the Invention> For example, according to the knowledge of the present inventors, when a polarizing plate and a retardation plate are laminated to produce an elliptically polarizing plate of a product size, it is generated at the time of lamination. The phase difference of the phase difference plate changes due to the applied stress. Such a change in the phase difference is fixed by the adhesive used for bonding, and causes residual distortion to cause an abnormal phase difference.Therefore, when such an elliptically polarizing plate is mounted as a liquid crystal display, color unevenness may occur. As a result, uniform black and white display cannot be obtained.
ところで、こうしたフイルムの貼り合わせにおいては
フイルムに応力が発生するのが不可避であるのみなら
ず、かかる応力の発生を少なくしようとしても応力解析
装置などが必要とされ、製造設備が大掛かりなものとな
ることが避けられない。加えて、応力の発生を抑えるた
めに貼り合わせ時の加圧を弱めると、充分な接着強度が
得られず、接着界面での剥がれや発泡の問題を生じるお
それがある。By the way, in bonding such films, it is not only inevitable that stress is generated in the film, but also in order to reduce the generation of such stress, a stress analysis device or the like is required, and the manufacturing equipment becomes large. That is inevitable. In addition, if the pressure at the time of bonding is reduced in order to suppress the generation of stress, sufficient adhesive strength cannot be obtained, and there is a possibility that peeling or foaming at the adhesive interface may occur.
＜課題を解決するための手段＞ 本発明は、かかる従来技術の問題点に鑑みてなされた
もので、かかる応力の集中を一定の方向にコントロール
することにより、簡易な設備で表示特性にすぐれる楕円
偏光板を得る製造方法を提案するものである。しかして
本発明の要旨とするところは、偏光板と位相差板とを積
層した製品サイズの楕円偏光板を製造する方法であっ
て、予め製品サイズ以上の大きさの偏光板と位相差板と
をロールの加圧により貼り合わせて応力を矩形端部に集
中させた後、この積層板の縁部を切除して製品サイズの
楕円偏光板を得る工程を包含する楕円偏光板の製造方法
である。<Means for Solving the Problems> The present invention has been made in view of the problems of the related art, and has excellent display characteristics with simple equipment by controlling the concentration of the stress in a certain direction. The present invention proposes a manufacturing method for obtaining an elliptically polarizing plate. Thus, the gist of the present invention is a method of manufacturing a product size elliptically polarizing plate in which a polarizing plate and a phase difference plate are laminated, and a polarizing plate and a phase difference plate having a size equal to or larger than the product size in advance. And applying a pressure to the rolls to concentrate the stress on the rectangular end, and then cutting off the edge of the laminated plate to obtain a product-sized elliptically polarizing plate. .
＜発明の構成＞ 本発明は偏光板と位相差板とを貼り合わせて楕円偏光
板とする工程中に特徴を有するもので、かかる工程を添
付図面を用いて具体的に説明する。第１図において、１
は予め製品サイズ以上の大きさに加工した偏光フィルム
からなる偏光板であり、２は高分子透明フイルムを延伸
した複屈折性フイルムからなる位相差板である。破線部
は製品サイズの大きさを表している。かかる偏光板１と
位相差板２は、最適な光軸関係となるようにして重ね合
わされ、接着剤を介して（図示省略）貼り合わされる。
Ｘは偏光軸、Ｙは遅相軸（通常は延伸軸となる）を示
し、ＸとＹの交差角度θは通常15〜75゜とされるのが好
ましい。<Structure of the Invention> The present invention has a feature in a process of bonding a polarizing plate and a retardation plate to form an elliptically polarizing plate, and such a process will be specifically described with reference to the accompanying drawings. In FIG. 1, 1
Is a polarizing plate made of a polarizing film processed in advance to a product size or more, and 2 is a retardation plate made of a birefringent film obtained by stretching a polymer transparent film. The broken line represents the size of the product. The polarizing plate 1 and the retardation plate 2 are overlapped so as to have an optimum optical axis relationship, and are attached via an adhesive (not shown).
X indicates a polarization axis, Y indicates a slow axis (usually a stretching axis), and the intersection angle θ between X and Y is preferably 15 to 75 °.
しかして本発明においては、この製品サイズ以上の大
きさの偏光板１と位相差板２の貼り合わせを、第２図に
示す如く、ロールＲの加圧により行なう。このようなロ
ールの加圧によって、加圧部が直線状になり、その直線
部分が連続的に縁部に移行する結果、積層板A1に生ずる
応力を縁部に集中させることができるものである。従っ
て、応力が積層板A1の縁部に集中されるので、積層板A1
の央域においては応力歪みを少なくすることができる。
第１図及び第２図における各部材1,2の端縁から破線部
までの距離ｌは、かかる積層板A1に生ずる応力の集中状
態を考慮して定められ、各部材1,2の厚みや位相差板２
の位相差値或いは加圧の条件などによっても異なるが、
少なくとも5mm以上とされることが好ましいものであ
る。In the present invention, the bonding of the polarizing plate 1 and the retardation plate 2 having a size equal to or larger than the product size is performed by pressing the roll R as shown in FIG. The pressure of such a roll, pressing becomes linearly, as a result of the straight line portion continuously moves to the edge, the stress generated in the laminated plate A 1 as it can be concentrated on the edges is there. Therefore, the stress is concentrated on the edges of the laminate A 1, laminate A 1
In the central region, stress distortion can be reduced.
Distance l from the edges of the members 1 and 2 to the broken line in FIGS. 1 and 2 is defined by considering the concentration state of the stress generated in such laminate A 1, the thickness of each member 1, 2 And phase difference plate 2
Although it differs depending on the phase difference value of
Preferably, it is at least 5 mm or more.
上記の結果、製品サイズ（破線内）の大きさにおいて
は応力歪みの少ない積層板を得ることができるものであ
る。尚、ロールの加圧は、積層板A1を固定して加圧ロー
ルを移動させて行ってもよく、又、ロールを固定式にし
て積層板A1を移動させて行ってもよい。As a result, it is possible to obtain a laminate having less stress distortion in the product size (within the broken line). Incidentally, the pressure of the rolls, by fixing the laminate A 1 may be performed by moving the pressure roll, or may be performed by moving the laminate A 1 and the roll fixed.
次いで、このように偏光板１と位相差板２とを貼り合
わせた後、第３図に示すように、この積層板A1の周縁部
を切除し、製品サイズの楕円偏光板A2を得る。切除は、
周縁部を切断刃で端部毎におこなってもよいが、第３図
の如くに製品サイズに打ち抜くことによって行なうこと
ができる。Then, after attaching the polarizing plate 1 and the phase difference plate 2 as described above, as shown in FIG. 3, it was excised periphery of the laminate A 1, to obtain an elliptically polarizing plate A 2 product size . The resection is
The peripheral edge may be formed for each end with a cutting blade, but can be performed by punching the product into a product size as shown in FIG.
＜実施例＞ 偏光板として、延伸ポリビニルアルコールに沃素錯体
を付着させ両面にトリアセテートフイルムの保護層を設
けた厚さ180μｍの高分子フイルム（日東電工（株）製N
PF−G1220DU）で220mm×160mmサイズにカットしたもの
を用意した。一方、位相差板として、ポリカーボネート
フイルムを140℃の乾燥塔内で10％延伸した厚さ50μｍ
の高分子フイルム（日東電工（株）製NRF−RF、位相差
値は500nm）を同寸法にカットした。この両フイルムを
偏光軸と遅相軸とが45゜に交差するように配置し、アク
リル系接着剤を介してフイルムよりやや広幅のラミネー
トロールの加圧によって貼り合わせた。加圧は、23℃
下、圧力5kg/cm2の条件で行った。<Example> As a polarizing plate, a 180-μm-thick polymer film (Nitto Denko Corporation) with an iodine complex attached to stretched polyvinyl alcohol and a protective layer of a triacetate film provided on both sides
PF-G1220DU), which was cut into a size of 220 mm x 160 mm. On the other hand, as a retardation plate, a polycarbonate film was stretched 10% in a drying tower at 140 ° C. to a thickness of 50 μm.
(NRF-RF manufactured by Nitto Denko Corporation, phase difference value: 500 nm) was cut into the same dimensions. Both films were arranged so that the polarization axis and the slow axis crossed at 45 °, and were bonded together via an acrylic adhesive by pressing a laminating roll slightly wider than the film. Pressure is 23 ℃
The test was performed under the conditions of a pressure of 5 kg / cm 2 below.
そして、このようにロールの加圧によって貼り合わせ
た後、200mm×140mmの製品サイズにトムソン刃型で打ち
抜いた。Then, after bonding by pressing the rolls as described above, the product was punched into a product size of 200 mm × 140 mm using a Thomson blade.
このように打ち抜いてなる積層楕円偏光板は、気泡の
抱き込みがなく、強固に接着していた。そしてこの楕円
偏光板を液晶ディスプレイに実装したところ、画面全体
にわたって色ムラのない均一な白黒表示の表示が得られ
た。因みに、偏光板と位相差板とを予め製品サイズとし
た以外は上記と同一の条件で貼り合わせた楕円偏光板を
そのまま液晶ディスプレイに実装したところ、端縁から
２〜3mm程度の部分の周縁部のほぼ全体に亘って位相差
変化に起因するとみられる色ムラがみられた。The laminated elliptically polarizing plate punched out in this manner had no air bubbles and was firmly adhered. Then, when this elliptically polarizing plate was mounted on a liquid crystal display, uniform black and white display without color unevenness was obtained over the entire screen. By the way, except that the polarizing plate and the phase difference plate were previously made to the product size, when the elliptically polarizing plate bonded under the same conditions as above was mounted on the liquid crystal display as it was, the peripheral portion of about 2-3 mm from the edge Color unevenness, which is considered to be caused by the change in the phase difference, was observed over almost the entire area.
＜発明の効果＞ 本発明は以上の如くロールの加圧によって位相差の変
化する部分を端部に集中させ、この集中した位相差異常
部を除去することにより、均一な表示特性をもつ楕円偏
光板を得ることができる。しかも、端部への応力の集中
を利用しているので、とくに応力を抑えるために製造設
備を大掛かりとする必要がなく、又、充分な加圧を行う
ことができるので、気泡の抱き込みや剥がれもない良好
な楕円偏光板が得られるという利点がある。<Effect of the Invention> As described above, the present invention concentrates the portion where the phase difference changes due to the pressure of the roll at the end portion and removes the concentrated phase difference abnormal portion, thereby providing elliptically polarized light having uniform display characteristics. You can get a board. In addition, since the concentration of stress at the end portion is utilized, it is not necessary to increase the size of the manufacturing equipment to suppress the stress, and sufficient pressurization can be performed, so that air bubbles can be entrapped. There is an advantage that a good elliptically polarizing plate without peeling can be obtained.
【図面の簡単な説明】 第１図、第２図及び第３図は本発明の製造工程を説明す
る説明図である。 １……偏光板、２……位相差板、A1……積層板 A2……製品サイズの楕円偏光板BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 2, and FIG. 3 are explanatory views for explaining a manufacturing process of the present invention. 1 ...... polarizer, 2 ...... retarder, A 1 ...... elliptically polarizing plate of the laminated plate A 2 ...... Product size
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−283947（ＪＰ，Ａ) 特開 平２−120805（ＪＰ，Ａ) 実開 平２−64901（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-283947 (JP, A) JP-A-2-120805 (JP, A) JP-A-2-64901 (JP, U)
Claims (1)
の楕円偏光板を製造する方法であって、予め製品サイズ
以上の大きさの偏光板と位相差板とをロールの加圧によ
り貼り合わせて応力を矩形端部に集中させた後、この積
層板の端部を切除して製品サイズの楕円偏光板を得る工
程を包含する楕円偏光板の製造方法1. A method for manufacturing an elliptically polarizing plate having a product size in which a polarizing plate and a retardation plate are laminated, wherein a polarizing plate having a size not less than the product size and a retardation plate are previously pressed by a roll. A method of manufacturing an elliptically polarizing plate including a step of obtaining a product-sized elliptically polarizing plate by cutting off the end of the laminated plate after concentrating stress on a rectangular end by bonding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24479590A JP3166774B2 (en) | 1990-09-14 | 1990-09-14 | Manufacturing method of elliptically polarizing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24479590A JP3166774B2 (en) | 1990-09-14 | 1990-09-14 | Manufacturing method of elliptically polarizing plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04123008A JPH04123008A (en) | 1992-04-23 |
| JP3166774B2 true JP3166774B2 (en) | 2001-05-14 |
Family
ID=17124050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24479590A Expired - Lifetime JP3166774B2 (en) | 1990-09-14 | 1990-09-14 | Manufacturing method of elliptically polarizing plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3166774B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06289221A (en) * | 1993-03-31 | 1994-10-18 | Arisawa Mfg Co Ltd | Production of elliptically polarizing plate |
| JPH08254670A (en) * | 1995-03-17 | 1996-10-01 | Tsutsunaka Plast Ind Co Ltd | Polarizing plate |
-
1990
- 1990-09-14 JP JP24479590A patent/JP3166774B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04123008A (en) | 1992-04-23 |
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