JP2006184431A - Liquid crystal display element, and method for manufacturing the same, and member for the same - Google Patents
Liquid crystal display element, and method for manufacturing the same, and member for the same Download PDFInfo
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Abstract
Description
本発明は液晶表示素子およびその製造方法ならびにその部材に関する。さらに詳しくは、基板同士を重ね合わせても配向不良が少ない液晶表示素子用部材およびそれを用いた液晶表示素子およびその製造方法に関する。 The present invention relates to a liquid crystal display element, a manufacturing method thereof, and a member thereof. More specifically, the present invention relates to a member for a liquid crystal display element that has few alignment defects even when the substrates are overlapped, a liquid crystal display element using the same, and a method for manufacturing the same.
従来、液晶表示素子の製造方法としては、ガラス基板を用いる方法が主流であり、大型の液晶ディスプレイや、中小型の液晶ディスプレイが作製されている。
ガラスにて作製した液晶表示素子は落下させるとガラスが破損したり、重量が重く、薄板化すると、生産時に割れが生じて量産性が劣るなどの欠点がある。このためプラスチック基板を用いた液晶表示素子が作製されている。
Conventionally, as a manufacturing method of a liquid crystal display element, a method using a glass substrate has been the mainstream, and a large-sized liquid crystal display or a small-sized liquid crystal display has been produced.
A liquid crystal display element made of glass has the disadvantages that, when dropped, the glass is damaged, or the weight is heavy, and if it is made thin, cracks occur during production, resulting in poor mass productivity. For this reason, a liquid crystal display element using a plastic substrate is produced.
また、プラスチック基板を用い液晶表示素子を作製した場合、ガラス基板に比べ屈曲性、柔軟性が有るため、現行の枚葉方式の生産方法から、ロール・ツー・ロール方式にて生産することにより、飛躍的に製造スピードを向上させ生産効率を上げることも可能である。例えば液晶表示素子製造の一工程である液晶セル工程も同様にロール・ツー・ロール方式にて生産すれば生産スピードを向上させることは可能である。しかし、プラスチック基板上に配向膜を形成させた後に基板を巻き取ったり、巻き出す工程がある場合、形成された配向膜が重なった基板の下面に接触し、キズがついたりして配向不良が発生する場合があり、歩留まりが著しく低下する恐れがあった。 In addition, when a liquid crystal display element is produced using a plastic substrate, it has flexibility and flexibility compared to a glass substrate, so by producing from a current single wafer production method by a roll-to-roll method, It is also possible to dramatically improve manufacturing speed and increase production efficiency. For example, if the liquid crystal cell process, which is one process for manufacturing a liquid crystal display element, is also produced by the roll-to-roll method, the production speed can be improved. However, if there is a step of winding or unwinding the substrate after forming the alignment film on the plastic substrate, the alignment film formed will come into contact with the lower surface of the overlapped substrate, and scratches may cause alignment failure. In some cases, the yield may decrease significantly.
本発明の目的は、液晶表示素子およびその製造方法ならびに液晶表示素子用部材を提供することにある。 The objective of this invention is providing the liquid crystal display element, its manufacturing method, and the member for liquid crystal display elements.
本発明の他の目的は、プラスチック基板同士を重ね合せた際にも配向不良が著しく低減された液晶表示素子用部材を用いた液晶表示素子の製造方法および当該液晶表示用部材と液晶表示素子を提供することにある。 Another object of the present invention is to provide a method for producing a liquid crystal display element using a liquid crystal display element member in which alignment defects are significantly reduced even when plastic substrates are overlaid, and the liquid crystal display member and the liquid crystal display element. It is to provide.
本発明のさらに他の目的および利点は以下の説明から明らかになろう。 Still other objects and advantages of the present invention will become apparent from the following description.
上記課題を解決するため、鋭意検討した結果、特定の構成の液晶表示素子用部材を用いて、液晶表示素子を製造することにより、製造装置の簡略化が可能でしかもロール・ツー・ロール方式で巻き取り、巻き出す工程を経て生産しても、配向不良を著しく低減可能なことがわかった。 As a result of intensive studies to solve the above problems, it is possible to simplify the manufacturing apparatus by manufacturing a liquid crystal display element using a liquid crystal display element member having a specific configuration, and also in a roll-to-roll system. It has been found that alignment defects can be remarkably reduced even if production is performed through winding and unwinding processes.
すなわち、本発明によれば、本発明の上記目的および利点は、第１に、
プラスチック基板の片面上に直接あるいは間接にスペーサーを形成し、その上に配向膜を設けた液晶表示素子用部材を配向膜を設けた面と配向膜を設けない面とを断続的に接触させて巻取る工程を含む液晶表示素子の製造法によって達成される。
That is, according to the present invention, the above objects and advantages of the present invention are as follows.
A spacer is formed directly or indirectly on one surface of a plastic substrate, and a liquid crystal display element member provided with an alignment film thereon is intermittently brought into contact with the surface provided with the alignment film and the surface not provided with the alignment film. This is achieved by a method for manufacturing a liquid crystal display element including a winding step.
本発明によれば、本発明の上記目的および利点は、さらに、
本発明の液晶表示素子の製造法に使用されるための上記液晶表示素子用部材および本発明の上記製造法により製造された液晶表示素子によって達成される。
According to the present invention, the above objects and advantages of the present invention are further
This is achieved by the liquid crystal display element member to be used for the liquid crystal display element manufacturing method of the present invention and the liquid crystal display element manufactured by the above manufacturing method of the present invention.
本発明において用いられる液晶表示素子用部材をラビングなどの配向処理前あるいは配向処理後にロールへの巻き出し、巻き取り工程を経ても、配向膜表面に基板との接触によるキズがつきにくいため、配向不良を著しく低減出来る。本発明における液晶表示素子用部材のスペーサーは液晶表示素子のセルギャップを均一に保つのみならず、製造工程での配向不良を低減させる役割がある。 Even if the liquid crystal display element member used in the present invention is unwound onto a roll before or after the alignment treatment such as rubbing or after the alignment treatment, the alignment film surface is hardly damaged by contact with the substrate. Defects can be significantly reduced. The spacer of the liquid crystal display element member in the present invention not only keeps the cell gap of the liquid crystal display element uniform, but also has a role of reducing alignment defects in the manufacturing process.
（液晶表示素子用部材）
本発明における液晶表示素子における本発明の液晶表示素子用部材の層構成は例えば図１の（ａ）の模式的断面図に示す様に基板上に直接スペーサーを設けることができ、また、基板の上に単層あるいは多層の膜を設け、その上にスペーサーを設けるように基板の上に、間接に設けてもよい。配向膜はスペーサーを形成後に設けてもよい。図１の（ｂ）は図１の（ａ）の模式的平面図である。
(Components for liquid crystal display elements)
The layer configuration of the liquid crystal display element member of the present invention in the liquid crystal display element of the present invention can be provided with a spacer directly on the substrate as shown in the schematic cross-sectional view of FIG. A single layer or multilayer film may be provided on the substrate, and the spacer may be provided on the substrate indirectly such that a spacer is provided thereon. The alignment film may be provided after the spacer is formed. FIG. 1B is a schematic plan view of FIG.
基板
本発明に使用できる基板としては、プラスチック基板を挙げることができる。プラスチック基板としては例えばポリエチレンテレフタレート，ポリブチレンテレフタレート，ポリエチレンナフタレート，トリアセチルセルロース，ポリアミド，ポリイミド，ポリメチルメタクリレート，ポリシクロオレフィン，シクロオレフィンコポリマー，架橋型エポキシ樹脂，架橋型アクリル樹脂，架橋型シリコーン樹脂，不飽和ポリエステル，ポリサルホン，ポリエーテルサルホン，ポリカーボネート，ポリアリレート等から成る基板が挙げられる。これらのプラスチック基板の中でも、高温使用下での液晶表示素子の信頼性を高めるため、ガラス転移温度が１００℃以上であることが好ましい。このようなプラスチック基板の例を挙げると、ポリエーテルサルホン，架橋型エポキシ樹脂，架橋型アクリル樹脂，ポリアミド，ポリイミド等から成る基板が挙げられる。
Substrate As a substrate that can be used in the present invention, a plastic substrate can be exemplified. Examples of plastic substrates include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, triacetyl cellulose, polyamide, polyimide, polymethyl methacrylate, polycycloolefin, cycloolefin copolymer, crosslinked epoxy resin, crosslinked acrylic resin, and crosslinked silicone resin. , Substrates made of unsaturated polyester, polysulfone, polyethersulfone, polycarbonate, polyarylate, and the like. Among these plastic substrates, the glass transition temperature is preferably 100 ° C. or higher in order to increase the reliability of the liquid crystal display element under high temperature use. Examples of such plastic substrates include substrates made of polyethersulfone, cross-linked epoxy resin, cross-linked acrylic resin, polyamide, polyimide, and the like.
配向膜
配向膜としては、例えばポリイミドやポリアミド酸、ポリアミド、ポリビニルアルコールなどの高分子材料の有機膜などを用いることができる。これらのうち、ポリイミド、ポリアミド酸およびポリイミドとポリアミド酸の混合物が好ましい。膜厚として好ましくは５０Åから５，０００Å、さらに好ましくは１００Åから３，０００Åである。
As the alignment film , for example, an organic film of a polymer material such as polyimide, polyamic acid, polyamide, or polyvinyl alcohol can be used. Of these, polyimide, polyamic acid and a mixture of polyimide and polyamic acid are preferred. The film thickness is preferably 50 to 5,000 mm, more preferably 100 to 3,000 mm.
スペーサー
スペーサーとしては例えば、フォトリソグラフィーにより形成されるスペーサーが挙げらえる。フォトリソグラフィーにより形成されるスペーサーには、例えばポリイミド系樹脂、エポキシ系樹脂、アクリル系樹脂、ウレタン系樹脂、ポリエステル系樹脂、ポリオレフィン系樹脂、フェノールノボラック系樹脂を主成分とした感光性樹脂が使用できる。
The spacer spacer example, Rael mentioned spacer is formed by photolithography. For the spacer formed by photolithography, for example, a photosensitive resin mainly composed of polyimide resin, epoxy resin, acrylic resin, urethane resin, polyester resin, polyolefin resin, phenol novolac resin can be used. .
形成されるスペーサーの高さは、プラスチック基板などの曲げられる基板を使用し、製造工程にて基板の巻き取り、巻き出し工程が入る場合には下記式（１）にて表される関係を満足するのが好ましい。 The height of the spacer to be formed satisfies the relationship expressed by the following formula (1) when a substrate that can be bent, such as a plastic substrate, is used, and the substrate is wound or unwound in the manufacturing process. It is preferable to do this.
Ｄ−｜（Ｄ２−（Ｃ／２）２）｜1/2 ＜ Ｂ （１）
式中Ｄは本発明の液晶表示素子用部材の厚みと巻き出し、巻き取りを行う製造装置のロールの半径との和であり、Ｃは形成されたスペーサー間の間隔、Ｂはスペーサーの高さである。
D− | (D 2 − (C / 2) 2 ) | 1/2 <B (1)
In the formula, D is the sum of the thickness of the liquid crystal display element member of the present invention and the radius of the roll of the manufacturing apparatus that performs unwinding and winding, C is the distance between the formed spacers, and B is the height of the spacer. It is.
（液晶表示素子製造法）
本発明における液晶表示素子の製造法は本発明の液晶表示素子用部材で配向膜を設けた面と配向膜を設けない面をスペーサー部分を介して断続的に接触させる工程を含む。
(Liquid crystal display device manufacturing method)
The manufacturing method of the liquid crystal display element in this invention includes the process which contacts the surface which provided the alignment film and the surface which does not provide an alignment film with the member for liquid crystal display elements of this invention through a spacer part intermittently.
プラスチック基板を用いた場合、ガラス基板に比べ屈曲性、柔軟性があるため、現行の枚葉方式の生産方法から、ロール・ツー・ロール方式にて生産することにより、飛躍的に製造スピードを向上させ生産効率を上げることも可能である。ロール・ツー・ロール方式では図２に示されるようにロールに巻き出し、巻き取り工程が必要である。本発明の液晶表示素子用部材をロールに巻き出し、巻き取りを行っても、スペーサーの間隙によって、配向膜に基板が接触しにくくなる。すなわち、図３の拡大説明図に示されているとおり、図では黒点で示されているスペーサー部分の存在により配向膜と基板とが接触しにくくなっている。例えば、本発明の液晶表示素子用部材をラビングなどの配向処理前あるいは配向処理後にロールへの巻き出し、巻き取り工程を経ても、配向膜表面に基板との接触によるキズがつきにくいため、配向不良を著しく低減出来る。 When plastic substrates are used, they are more flexible and flexible than glass substrates, so production speed is dramatically improved by producing roll-to-roll production from the current single wafer production method. It is also possible to increase production efficiency. In the roll-to-roll system, as shown in FIG. 2, a roll-out and winding process is required. Even when the liquid crystal display element member of the present invention is unwound on a roll and wound, the substrate is less likely to contact the alignment film due to the gap between the spacers. That is, as shown in the enlarged explanatory view of FIG. 3, the alignment film and the substrate are less likely to come into contact with each other due to the presence of the spacer portion indicated by a black dot in the drawing. For example, even if the liquid crystal display element member of the present invention is unwound onto a roll before or after the alignment treatment such as rubbing or after the alignment treatment, the alignment film surface is hardly damaged by contact with the substrate. Defects can be significantly reduced.
すなわち、本発明における液晶表示素子用部材のスペーサーは液晶表示素子のセルギャップを均一に保つのみならず、製造工程での配向不良を低減させる役割がある。 That is, the spacer of the liquid crystal display element member in the present invention not only keeps the cell gap of the liquid crystal display element uniform, but also has a role of reducing alignment defects in the manufacturing process.
実施例１
（液晶表示素子用部材の作製）
ポリエーテルサルホン（ガラス転移温度２２３℃）を基材とする膜厚２００μｍ、長さ３００ｍｍのプラスチックフィルムに透明電極としてＩＴＯを形成した基板を純水にて洗浄後、アクリル系樹脂フォトスペーサー形成剤をスピンコート法にて塗布し、８０℃で３分間ホットプレート上でプレベークして塗膜を形成した。パターンマスクを用いて３６５ｎｍでの強度が１０ｍＷ／ｃｍ２である紫外線を３０秒間照射した。この際の紫外線照射は酸素雰囲気下（空気下）で行った。N−メチルピぺリジン１．０重量％で２５℃で１分間現像した後、純水で１分間リンスした。これらの操作により、不要な部分を除去し、１０μｍ×１０μｍのスペーサーパターンを格子状に３００μｍ間隔で形成した。オーブン中で１８０℃で６０分間加熱して硬化させ高さ５μｍのスペーサーパターンを得た。
Example 1
(Production of liquid crystal display element members)
A substrate made of polyethersulfone (glass transition temperature of 223 ° C.) as a base material with a film thickness of 200 μm and a length of 300 mm formed of ITO as a transparent electrode is washed with pure water, and then an acrylic resin photospacer forming agent Was applied by spin coating, and pre-baked on a hot plate at 80 ° C. for 3 minutes to form a coating film. Using a pattern mask, ultraviolet rays having an intensity at 365 nm of 10 mW / cm 2 were irradiated for 30 seconds. The ultraviolet irradiation at this time was performed in an oxygen atmosphere (under air). After developing for 1 minute at 25 ° C. with 1.0% by weight of N-methylpiperidine, it was rinsed with pure water for 1 minute. By these operations, unnecessary portions were removed, and 10 μm × 10 μm spacer patterns were formed in a lattice pattern at intervals of 300 μm. It was cured by heating at 180 ° C. for 60 minutes in an oven to obtain a spacer pattern having a height of 5 μm.
次に液晶配向剤としてポリイミド配向剤を、液晶配向膜塗布用印刷機を用いて塗布し、１８０℃のオーブン内で２０分間乾燥し、液晶表示素子用部材aを作製した。 Next, a polyimide alignment agent was applied as a liquid crystal alignment agent using a liquid crystal alignment film coating printer and dried in an oven at 180 ° C. for 20 minutes to prepare a liquid crystal display element member a.
（液晶表示素子用部材の製造）
ロール・ツー・ロール方式の巻き取り、巻き出し工程を想定して、直径５０ｍｍの筒状ロールに液晶表示素子用部材aを巻きつけ、巻き取り、巻き出しを１回としてこれを１０回繰り返した。（以上、巻き取り、巻き出し工程とする。）
次にレーヨン製の布を巻き付けたロールを有するラビングマシーンにより、ロールの回転数４００ｒｐｍ、ステージの移動速度３０ｍｍ／秒、毛足押し込み長さ０.４ｍｍでラビング処理を行い、水洗を行った後、１２０℃のオーブン中で１０分間乾燥した。（以上、ラビング工程とする。）次に、液晶配向膜を形成した面の外縁に、直径５μｍの酸化アルミニウム球入りエポキシ樹脂接着剤を塗布し上側基板とした。一方、スペーサーを形成せず、巻き取り、巻き出し工程を行わず、エポキシ樹脂接着剤を塗布しなかった他は液晶表示素子用部材ａと同様にして液晶表示素子用部材ｂを作製し、下側基板とした。ツイステッドネマティック（ＴＮ）型の液晶セルを形成するため、上側基板と液晶下側基板が９０°の角度にて相対する様（図４）に重ね合わせて圧着し、接着剤を硬化させた。次いで、液晶注入口より、ネマティック型液晶（メルク社製、ＭＬＣ−６２２１）を充填した後、アクリル系光硬化接着剤で液晶注入口を封止した。上下にクロスニコルになる様偏向板を貼りあわせ液晶表示素子Ｘ１を作製した。
(Manufacture of liquid crystal display element members)
Assuming a roll-to-roll type winding and unwinding process, the liquid crystal display element member a is wound around a cylindrical roll having a diameter of 50 mm, and the winding and unwinding are performed once, and this is repeated 10 times. . (The above is the winding and unwinding process.)
Next, with a rubbing machine having a roll wrapped with a rayon cloth, the rubbing treatment was performed at a rotational speed of the roll of 400 rpm, a moving speed of the stage of 30 mm / second, and a push-in length of 0.4 mm, followed by washing with water. Dry in an oven at 120 ° C. for 10 minutes. (Hereinafter, it is referred to as a rubbing step.) Next, an epoxy resin adhesive containing aluminum oxide spheres having a diameter of 5 μm was applied to the outer edge of the surface on which the liquid crystal alignment film was formed to form an upper substrate. On the other hand, a liquid crystal display element member b was prepared in the same manner as the liquid crystal display element member a except that the spacer was not formed, the winding and unwinding steps were not performed, and the epoxy resin adhesive was not applied. A side substrate was used. In order to form a twisted nematic (TN) type liquid crystal cell, the upper substrate and the lower liquid crystal substrate were overlapped and bonded so that they face each other at an angle of 90 ° (FIG. 4), and the adhesive was cured. Next, after filling a nematic liquid crystal (MLC-6221, manufactured by Merck & Co., Inc.) from the liquid crystal injection port, the liquid crystal injection port was sealed with an acrylic photo-curing adhesive. A liquid crystal display element X1 was produced by laminating deflecting plates so as to be crossed Nicols up and down.
（液晶表示素子の表示品位の評価）
上記の如くして、同じ液晶表示素子を１０個作製し、矩形波６０Ｈｚ、交流電圧１Ｖ及び２Ｖを印加し、表示不良が見られるかどうかを目視にて評価した。
(Evaluation of display quality of liquid crystal display elements)
As described above, ten of the same liquid crystal display elements were produced, and a rectangular wave of 60 Hz and alternating voltages of 1 V and 2 V were applied, and whether or not display defects were observed was visually evaluated.
実施例２
実施例１の巻き取り、巻き出し工程をラビング工程の前に行わず、ラビング工程の後に行った他は実施例１と同様にして、液晶表示素子Y１を作製し、評価した。
Example 2
A liquid crystal display element Y1 was prepared and evaluated in the same manner as in Example 1 except that the winding and unwinding steps of Example 1 were not performed before the rubbing step but were performed after the rubbing step.
比較例１
液晶表示素子用部材ａの代わりに液晶表示素子用部材bを用い、セルギャップ形成用に直径５μｍの球状スペーサーを散布し、下側基板とした以外は実施例１と同様にして、液晶表示素子 Ｘ２を作製し、評価した。
Comparative Example 1
A liquid crystal display element was used in the same manner as in Example 1 except that the liquid crystal display element member b was used in place of the liquid crystal display element member a, and a spherical spacer having a diameter of 5 μm was dispersed to form a cell gap to form a lower substrate. X2 was made and evaluated.
比較例２
液晶表示素子用部材ａの代わりに液晶表示素子用部材ｂを用いセルギャップ形成用に直径５μｍの球状スペーサーを散布し、下側基板とした以外は実施例２と同様にして、液晶表示素子 Ｙ２を作製し、評価した。
Comparative Example 2
A liquid crystal display element Y2 is used in the same manner as in Example 2 except that the liquid crystal display element member b is used in place of the liquid crystal display element member a and a spherical spacer having a diameter of 5 μm is dispersed to form a cell gap to form a lower substrate. Were made and evaluated.
表１に実施例１および２、比較例１および２の液晶表示素子の評価結果を示す。基板上にスペーサーを形成し配向膜を設けた液晶表示素子用部材では表示不良がみられないことがわかる。 Table 1 shows the evaluation results of the liquid crystal display elements of Examples 1 and 2 and Comparative Examples 1 and 2. It can be seen that no display defect is observed in the liquid crystal display element member in which the spacer is formed on the substrate and the alignment film is provided.
Claims (5)
A liquid crystal display device manufactured by the manufacturing method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004376376A JP2006184431A (en) | 2004-12-27 | 2004-12-27 | Liquid crystal display element, and method for manufacturing the same, and member for the same |
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| JP2004376376A JP2006184431A (en) | 2004-12-27 | 2004-12-27 | Liquid crystal display element, and method for manufacturing the same, and member for the same |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11249158A (en) * | 1998-02-27 | 1999-09-17 | Toshiba Corp | Production of liquid crystal display cell |
| JP2003340981A (en) * | 2002-05-28 | 2003-12-02 | Nitto Denko Corp | Resin sheet, method for manufacturing the same, and its use |
| JP2004287468A (en) * | 2004-07-12 | 2004-10-14 | Sharp Corp | Method for manufacturing liquid crystal display device |
| JP2004302316A (en) * | 2003-03-31 | 2004-10-28 | Fujitsu Display Technologies Corp | Method for manufacturing liquid crystal display panel |
| JP2004306586A (en) * | 2003-03-11 | 2004-11-04 | Sumitomo Bakelite Co Ltd | Manufacturing process of plastic sheet for display panel |
| JP2005292420A (en) * | 2004-03-31 | 2005-10-20 | Dainippon Printing Co Ltd | Base film for liquid crystal panel, functional film for the liquid crystal panel, manufacturing method for functional film and manufacturing apparatus for the functional film |
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2004
- 2004-12-27 JP JP2004376376A patent/JP2006184431A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11249158A (en) * | 1998-02-27 | 1999-09-17 | Toshiba Corp | Production of liquid crystal display cell |
| JP2003340981A (en) * | 2002-05-28 | 2003-12-02 | Nitto Denko Corp | Resin sheet, method for manufacturing the same, and its use |
| JP2004306586A (en) * | 2003-03-11 | 2004-11-04 | Sumitomo Bakelite Co Ltd | Manufacturing process of plastic sheet for display panel |
| JP2004302316A (en) * | 2003-03-31 | 2004-10-28 | Fujitsu Display Technologies Corp | Method for manufacturing liquid crystal display panel |
| JP2005292420A (en) * | 2004-03-31 | 2005-10-20 | Dainippon Printing Co Ltd | Base film for liquid crystal panel, functional film for the liquid crystal panel, manufacturing method for functional film and manufacturing apparatus for the functional film |
| JP2004287468A (en) * | 2004-07-12 | 2004-10-14 | Sharp Corp | Method for manufacturing liquid crystal display device |
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