JP5956828B2

JP5956828B2 - Manufacturing method of liquid crystal display element

Info

Publication number: JP5956828B2
Application number: JP2012108991A
Authority: JP
Inventors: 金孝関口; 関口　　金孝
Original assignee: Citizen Holdings Co Ltd; Citizen Watch Co Ltd; Citizen Fine Device Co Ltd
Current assignee: Citizen Holdings Co Ltd; Citizen Watch Co Ltd; Citizen Fine Device Co Ltd
Priority date: 2012-05-11
Filing date: 2012-05-11
Publication date: 2016-07-27
Anticipated expiration: 2032-05-11
Also published as: JP2013235199A

Description

本発明は、液晶表示素子の製造方法に関する。 The present invention relates to a method for manufacturing a liquid crystal display element.

小型高精細化が進んだ液晶表示素子（液晶表示パネル）は、通称マイクロディスプレイと呼ばれ、例えば、第１の基板と第２の基板と一部に注入口を有する外周シール部を有し、第１の基板と第２の基板と外周シール部により閉じられた空間に注入口より強誘電性液晶を注入し、注入口を封口材にて封止して封口部を形成したものである。マイクロディスプレイの小型化に伴い、実際に表示を行なう表示領域と外周シール部、あるいは、表示領域と封口部との間隔が狭くなり、特に封口部の周囲は、強誘電性液晶の配向が乱れる、あるいは、汚染が発生しやすいことがある。 A liquid crystal display element (liquid crystal display panel) that has been miniaturized and advanced in definition is commonly called a micro display, and has, for example, a first substrate, a second substrate, and an outer peripheral seal portion having an injection port in a part thereof, A ferroelectric liquid crystal is injected from the injection port into a space closed by the first substrate, the second substrate, and the outer peripheral seal portion, and the injection port is sealed with a sealing material to form a sealing portion. With the miniaturization of the micro display, the distance between the display area that actually displays and the outer peripheral seal part, or the display area and the seal part becomes narrower, especially the periphery of the seal part is disturbed in the orientation of the ferroelectric liquid crystal, Or contamination may be likely to occur.

これらの問題を解決する方法として、第１の基板と第２の基板と外周シール部により閉じられた空間に注入口より強誘電性液晶を注入した後、強誘電性液晶の溶解性を有する液晶溶解溶剤、例えば、イソプロピルアルコール（ＩＰＡ）が収容された容器（液槽）に液晶表示パネルを浸漬して、注入口周辺の強誘電性液晶をイソプロピルアルコールにより溶解除去し、その後、注入口を封口材にて封止する方法がある。（特許文献１参照） As a method for solving these problems, a ferroelectric liquid crystal having a solubility of ferroelectric liquid crystal is injected into the space closed by the first substrate, the second substrate, and the outer peripheral seal portion from the injection port. The liquid crystal display panel is immersed in a container (liquid tank) containing a dissolving solvent, for example, isopropyl alcohol (IPA), and the ferroelectric liquid crystal around the inlet is dissolved and removed with isopropyl alcohol, and then the inlet is sealed. There is a method of sealing with a material. (See Patent Document 1)

図１０−１、図１０−２は、従来技術における液晶表示素子の製造方法を示す平面図である。以下、従来技術における液晶表示素子の製造方法を図１０−１、図１０−２を用いて説明する。 10A and 10B are plan views showing a method for manufacturing a liquid crystal display element in the prior art. Hereinafter, the manufacturing method of the liquid crystal display element in a prior art is demonstrated using FIGS. 10-1 and 10-2.

まず、第１の基板１と第２の基板６とをシール材１１により１マイクロメートル（μｍ）程度の間隔で貼り合せて空液晶表示パネルを作成した後、シール材１１の一部に設けた注入口１４近傍の第２の基板６上に強誘電性液晶１３を滴下し、真空および加熱状態において、強誘電性液晶１３を注入口１４より空液晶表示パネル内に注入することで、図１０−１（ａ）に示す液晶表示パネルを得る。 First, after the first substrate 1 and the second substrate 6 were bonded to each other with a sealant 11 at an interval of about 1 micrometer (μm) to create an empty liquid crystal display panel, the first substrate 1 and the second substrate 6 were provided on a part of the sealant 11. The ferroelectric liquid crystal 13 is dropped on the second substrate 6 in the vicinity of the inlet 14, and the ferroelectric liquid crystal 13 is injected into the empty liquid crystal display panel from the injection port 14 in a vacuum and a heated state. -1 (a) is obtained.

尚、第１の基板１上には画素電極が設けられ、第２の基板６上には対向電極が設けられており、画素電極と対向電極との交点が表示画素となり、複数の表示画素がマトリクス状に配列されて表示領域３１が形成されている。 Note that a pixel electrode is provided on the first substrate 1 and a counter electrode is provided on the second substrate 6. An intersection between the pixel electrode and the counter electrode becomes a display pixel, and a plurality of display pixels are provided. A display area 31 is formed in a matrix.

この時、シール材１１の外周側に位置する第１の基板１と第２の基板６との隙間にギャップ液晶残り３５が発生し、さらに、第１の基板１と第２の基板６が互いにオフセットした部分の第２の基板６上に第２の基板上液晶残り３６が発生する。 At this time, a gap liquid crystal residue 35 is generated in the gap between the first substrate 1 and the second substrate 6 positioned on the outer peripheral side of the sealing material 11, and the first substrate 1 and the second substrate 6 are mutually connected. A second substrate liquid crystal residue 36 is generated on the offset second substrate 6.

次に、ギャップ液晶残り３５と第２の基板上液晶残り３６が発生した液晶表示パネルを、イソプロピルアルコール（ＩＰＡ）からなる液晶溶解溶剤中に所定時間浸漬してから取り出し、イソプロピルアルコールを乾燥させることで、図１０−１（ｂ）に示す液晶表示パネルを得る。 Next, the liquid crystal display panel in which the gap liquid crystal residue 35 and the second substrate liquid crystal residue 36 are generated is dipped in a liquid crystal dissolving solvent made of isopropyl alcohol (IPA) for a predetermined time and taken out, and the isopropyl alcohol is dried. Thus, the liquid crystal display panel shown in FIG.

イソプロピルアルコールには強誘電性液晶を溶解する性質があり、ギャップ液晶残り３５と第２の基板上液晶残り３６は、イソプロピルアルコールに溶解される。しかし、ギャップ液晶残り３５は、基板間の狭小な隙間にあることから、イソプロピルアルコールに触れ難く、溶解し難いため、完全には除去されない。さらに、イソプロピルアルコールは沸点が高く、特に強誘電性液晶が溶解したイソプロピルアルコールは、より乾燥し難いため、イソプロピルアルコールが乾燥するまでの間に、基板間に残った強誘電性液晶１３がイソプロピルアルコールにより徐々に溶解され、イソプロピルアルコールが乾燥した時点で、溶解していた強誘電性液晶が析出して液晶残渣部１８が形成される。尚、第２の基板上液晶残り３６は、イソプロピルアルコールに触れ易く、ほとんどが溶解するため、液晶残渣部１８は形成され難い。 Isopropyl alcohol has the property of dissolving ferroelectric liquid crystal, and the gap liquid crystal residue 35 and the second substrate liquid crystal residue 36 are dissolved in isopropyl alcohol. However, since the gap liquid crystal residue 35 is in a narrow gap between the substrates, it is difficult to touch the isopropyl alcohol and hardly dissolve, so that it is not completely removed. Furthermore, since isopropyl alcohol has a high boiling point, and particularly isopropyl alcohol in which ferroelectric liquid crystal is dissolved is more difficult to dry, the ferroelectric liquid crystal 13 remaining between the substrates until isopropyl alcohol is dried is isopropyl alcohol. When the isopropyl alcohol is dried, the dissolved ferroelectric liquid crystal is deposited and a liquid crystal residue 18 is formed. Note that the liquid crystal residue 36 on the second substrate is easy to touch isopropyl alcohol and is almost dissolved, so that the liquid crystal residue 18 is hardly formed.

また、一方では、注入口１４内にある強誘電性液晶１３（注入口内液晶１２）の一部がイソプロピルアルコールに溶解する。しかし、注入口１４内は狭小であり、イソプロピルアルコールが浸透し難いため、注入口内液晶１２は完全には除去されない。さらに、イソプロピルアルコールは沸点が高く、特に強誘電性液晶が溶解したイソプロピルアルコールは、純粋なイソプロピルアルコールより乾燥し難いため、乾燥するまでの間に、注入口１４内に残った注入口内液晶１２がイソプロピルアルコールにより徐々に溶解され、イソプロピルアルコールが乾燥した時点で、溶解していた強誘電性液晶１３が析出して液晶残渣部１８が形成される。 On the other hand, a part of the ferroelectric liquid crystal 13 (liquid crystal 12 in the injection port) in the injection port 14 is dissolved in isopropyl alcohol. However, since the inside of the injection port 14 is narrow and it is difficult for isopropyl alcohol to permeate, the liquid crystal 12 in the injection port is not completely removed. Furthermore, since isopropyl alcohol has a high boiling point, and isopropyl alcohol in which ferroelectric liquid crystal is dissolved is more difficult to dry than pure isopropyl alcohol, the liquid crystal 12 in the injection port remaining in the injection port 14 until the isopropyl alcohol is dried. When it is gradually dissolved by isopropyl alcohol and the isopropyl alcohol is dried, the dissolved ferroelectric liquid crystal 13 is deposited to form a liquid crystal residue 18.

次に、注入口１４に封口材１５を塗布し、図１０−２（ｃ）に示す液晶表示パネルを得る。この時、注入口１４周辺には液晶残渣部１８があるため、封口材１５は液晶残渣部１８の上に塗布されることになる。尚、この時点で封口材１５は液晶表示パネル内にある強誘電性液晶１３には接触しておらず、互いの間には僅かな隙間が形成されている。 Next, the sealing material 15 is apply | coated to the injection port 14, and the liquid crystal display panel shown to FIG. 10-2 (c) is obtained. At this time, since there is a liquid crystal residue 18 around the inlet 14, the sealing material 15 is applied onto the liquid crystal residue 18. At this time, the sealing material 15 is not in contact with the ferroelectric liquid crystal 13 in the liquid crystal display panel, and a slight gap is formed between them.

次に、液晶表示パネルの熱処理を行い、強誘電性液晶１３を等方相液体状態にして粘度を低下させると同時に膨張させ、封口材１５と強誘電性液晶１３との間の隙間を強誘電性液晶１３で充填した後、液晶表示パネルを徐冷し、強誘電性液晶１３を配向させることで、図１０−２（ｄ）に示す液晶表示パネルを得る。 Next, the liquid crystal display panel is subjected to heat treatment to make the ferroelectric liquid crystal 13 in an isotropic liquid state, thereby reducing the viscosity and expanding the ferroelectric liquid crystal 13 at the same time as the gap between the sealing material 15 and the ferroelectric liquid crystal 13. After filling with the conductive liquid crystal 13, the liquid crystal display panel is gradually cooled to align the ferroelectric liquid crystal 13 to obtain the liquid crystal display panel shown in FIG. 10-2 (d).

特許第４１１８１６７号Patent No. 4118167

従来技術では、注入口周辺の強誘電性液晶を液晶溶解溶剤（イソプロピルアルコール）で溶解することにより除去しているが、基板間の狭小な隙間には液晶溶解溶剤が浸透し難く、また、液晶溶解溶剤は沸点が高く、特に強誘電性液晶が溶解した液晶溶解溶剤は、純粋な液晶溶解溶剤よりさらに乾燥が難しいため、残渣を完全に無くすことは困難である。注入口周辺に残渣が存在していると、図１０−２（ｄ）に示すように、強誘電性液晶の配向が乱れ、表示領域３１にまで至る強誘電性液晶配向不良領域１７が発生したり、封口材１５と注入口１４との密着性が損なわれ、密閉不良部４０が発生し、そこから水分等が浸入することで、画像品質が低下するといった問題が発生する。また、注入口内に残る液晶溶解溶剤を乾燥するまでに時間が掛かると、液晶溶解溶剤が配向膜に浸透し、それが原因で画像品質が低下するといった問題も発生する。 In the prior art, the ferroelectric liquid crystal around the injection port is removed by dissolving with a liquid crystal dissolving solvent (isopropyl alcohol), but the liquid crystal dissolving solvent does not easily penetrate into the narrow gap between the substrates. The dissolving solvent has a high boiling point. In particular, the liquid crystal dissolving solvent in which the ferroelectric liquid crystal is dissolved is more difficult to dry than the pure liquid crystal dissolving solvent, and thus it is difficult to completely eliminate the residue. If there is a residue in the vicinity of the inlet, the ferroelectric liquid crystal orientation is disturbed as shown in FIG. 10D, and a ferroelectric liquid crystal misalignment region 17 that reaches the display region 31 is generated. In addition, the adhesiveness between the sealing material 15 and the injection port 14 is impaired, and a poorly sealed portion 40 is generated, and moisture or the like enters from there to cause a problem that the image quality is deteriorated. Further, if it takes time to dry the liquid crystal dissolving solvent remaining in the injection port, the liquid crystal dissolving solvent permeates the alignment film, which causes a problem that the image quality is deteriorated.

特にマイクロディスプレイでは、注入口１４と表示領域３１とが近接しており、さらに、基板間の隙間も狭小であるため、以上の問題が顕著である。 In particular, in the micro display, since the injection port 14 and the display region 31 are close to each other and the gap between the substrates is narrow, the above problem is remarkable.

本発明は、以上の問題を解決するためになされたもので、注入口周辺における液晶残渣の発生を抑えることが可能な液晶表示素子の製造方法を提供することを目的とする。 The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a liquid crystal display element capable of suppressing the generation of liquid crystal residues in the vicinity of an injection port.

第１の基板と第２の基板とを所定の間隙を介してシール材により貼り合わせ、該シール材に設けた注入口より、前記第１の基板と前記第２の基板との間に液晶を注入し、前記注入口周辺の前記液晶を液晶溶解溶剤により除去した後、前記注入口を封口材で封止する液晶表示素子の製造方法であって、前記注入口周辺の前記液晶を液晶溶解溶剤により除去する工程と、前記注入口を封口材で封止する工程との間に、前記注入口周辺に付着した前記液晶溶解溶剤を、前記液晶溶解溶剤を溶解し、且つ、前記液晶の溶解性が前記液晶溶解溶剤より低い液晶溶解溶剤置換液により置換する工程を有し、前記注入口周辺の前記液晶を前記液晶溶解溶剤により除去する工程と、前記注入口周辺に付着した前記液晶溶解溶剤を前記液晶溶解溶剤置換液により置換する工程との間に、前記注入口周辺に付着した前記液晶溶解溶剤を気体を吹き付けることにより除去する工程を有する液晶表示素子の製造方法とする。
A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material, wherein the liquid crystal around the injection port is liquid crystal dissolving solvent And the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent adhering to the periphery of the inlet, dissolving the liquid crystal dissolving solvent, and the solubility of the liquid crystal Replacing the liquid crystal dissolving solvent with a lower liquid crystal dissolving solvent than the liquid crystal dissolving solvent, removing the liquid crystal around the inlet with the liquid crystal dissolving solvent, and the liquid crystal dissolving solvent adhering to the periphery of the inlet. By the liquid crystal dissolving solvent replacement liquid Between the step of conversion, a method of manufacturing a liquid crystal display device having a step of removing by blowing a gas to the liquid crystal dissolution solvent adhering around the inlet.

前記気体の温度は、前記液晶溶解溶剤置換液の温度以下である液晶表示素子の製造方法とする。 The temperature of the gas is a manufacturing method of a liquid crystal display element that is equal to or lower than the temperature of the liquid crystal dissolving solvent replacement liquid.

第１の基板と第２の基板とを所定の間隙を介してシール材により貼り合わせ、該シール材に設けた注入口より、前記第１の基板と前記第２の基板との間に液晶を注入し、前記注入口周辺の前記液晶を液晶溶解溶剤により除去した後、前記注入口を封口材で封止する液晶表示素子の製造方法であって、前記注入口周辺の前記液晶を液晶溶解溶剤により除去する工程と、前記注入口を封口材で封止する工程との間に、前記注入口周辺に付着した前記液晶溶解溶剤を、前記液晶溶解溶剤を溶解し、且つ、前記液晶の溶解性が前記液晶溶解溶剤より低い液晶溶解溶剤置換液により置換する工程を有し、前記注入口周辺に付着した前記液晶溶解溶剤を前記液晶溶解溶剤置換液により置換する工程と、前記注入口を前記封口材で封止する工程との間に、前記注入口周辺に付着した前記液晶溶解溶剤置換液を減圧雰囲気にて乾燥させる工程を有する液晶表示素子の製造方法とする。
A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material, wherein the liquid crystal around the injection port is liquid crystal dissolving solvent And the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent adhering to the periphery of the inlet, dissolving the liquid crystal dissolving solvent, and the solubility of the liquid crystal Replacing the liquid crystal dissolving solvent adhering to the periphery of the injection port with the liquid crystal dissolving solvent replacement solution, and replacing the injection port with the sealing port. Before the process of sealing with material Said liquid crystal dissolution solvent substitution liquid adhering to the inlet peripheral and method of manufacturing a liquid crystal display device having a step of drying under a reduced pressure atmosphere.

第１の基板と第２の基板とを所定の間隙を介してシール材により貼り合わせ、該シール材に設けた注入口より、前記第１の基板と前記第２の基板との間に液晶を注入し、前記注入口周辺の前記液晶を液晶溶解溶剤により除去した後、前記注入口を封口材で封止する液晶表示素子の製造方法であって、前記注入口周辺の前記液晶を液晶溶解溶剤により除去する工程と、前記注入口を封口材で封止する工程との間に、前記注入口周辺に付着した前記液晶溶解溶剤を、前記液晶溶解溶剤を溶解し、且つ、前記液晶の溶解性が前記液晶溶解溶剤より低い液晶溶解溶剤置換液により置換する工程を有し、前記注入口周辺に付着した前記液晶溶解溶剤を前記液晶溶解溶剤置換液により置換する工程で使用された使用済みの前記液晶溶解溶剤置換液から、そこに混入した前記液晶溶解溶剤と前記液晶とを除去し、前記液晶溶解溶剤と前記液晶との混入量が減少した液晶溶解溶剤置換液を得ると共に、該液晶溶解溶剤置換液を、前記注入口周辺に付着した前記液晶溶解溶剤を前記液晶溶解溶剤置換液により置換する工程で使用する液晶表示素子の製造方法とする。
A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material, wherein the liquid crystal around the injection port is liquid crystal dissolving solvent And the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent adhering to the periphery of the inlet, dissolving the liquid crystal dissolving solvent, and the solubility of the liquid crystal Has a step of substituting with a liquid crystal dissolving solvent replacement solution lower than the liquid crystal dissolving solvent, and the used liquid used in the step of replacing the liquid crystal dissolving solvent adhering to the periphery of the inlet with the liquid crystal dissolving solvent replacement solution. From the liquid crystal dissolving solvent replacement solution, The liquid crystal dissolving solvent mixed with the liquid crystal is removed to obtain a liquid crystal dissolving solvent replacement liquid in which the mixing amount of the liquid crystal dissolving solvent and the liquid crystal is reduced. A liquid crystal display element manufacturing method used in the step of replacing the liquid crystal dissolving solvent adhering to the substrate with the liquid crystal dissolving solvent replacement liquid.

使用済みの前記液晶溶解溶剤置換液から、そこに混入した前記液晶溶解溶剤と前記液晶とを除去する工程は、前記液晶溶解溶剤を溶解し、且つ、前記液晶溶解溶剤置換液を溶解しない溶媒を使用済みの前記液晶溶解溶剤置換液に混入させることで、使用済みの前記液晶溶解溶剤置換液から前記液晶溶解溶剤が分離された処理液を得る工程と、該処理液から前記液晶溶解溶剤置換液を回収する工程と、回収した該液晶溶解溶剤置換液を蒸留することで、該液晶溶解溶剤置換液の純度を高める工程と、を有する液晶表示素子の製造方法とする。 The step of removing the liquid crystal dissolving solvent and the liquid crystal mixed therein from the used liquid crystal dissolving solvent replacement liquid dissolves the liquid crystal dissolving solvent and does not dissolve the liquid crystal dissolving solvent replacement liquid. A step of obtaining a treatment liquid in which the liquid crystal dissolution solvent is separated from the used liquid crystal dissolution solvent replacement liquid by mixing with the used liquid crystal dissolution solvent replacement liquid, and the liquid crystal dissolution solvent replacement liquid from the treatment liquid And a step of increasing the purity of the liquid crystal dissolving solvent replacement liquid by distilling the recovered liquid crystal dissolving solvent replacement liquid.

第１の基板と第２の基板とを所定の間隙を介してシール材により貼り合わせ、該シール材に設けた注入口より、前記第１の基板と前記第２の基板との間に液晶を注入し、前記注入口周辺の前記液晶を液晶溶解溶剤により除去した後、前記注入口を封口材で封止する液晶表示素子の製造方法であって、前記注入口周辺の前記液晶を液晶溶解溶剤により除去する工程と、前記注入口を封口材で封止する工程との間に、前記注入口周辺に付着した前記液晶溶解溶剤を、前記液晶溶解溶剤を溶解し、且つ、前記液晶の溶解性が前記液晶溶解溶剤より低い液晶溶解溶剤置換液により置換する工程を有し、前記液晶溶解溶剤は、イソプロピルアルコールからなり、前記液晶溶解溶剤置換液は、代替フロンからなる液晶表示素子の製造方法とする。 A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material, wherein the liquid crystal around the injection port is liquid crystal dissolving solvent And the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent adhering to the periphery of the inlet, dissolving the liquid crystal dissolving solvent, and the solubility of the liquid crystal A liquid crystal dissolving solvent replacement solution lower than the liquid crystal dissolving solvent, wherein the liquid crystal dissolving solvent is made of isopropyl alcohol, and the liquid crystal dissolving solvent replacement solution is made of alternative chlorofluorocarbon. To do.

本発明の液晶表示素子の製造方法を利用することにより、注入口内における液晶残渣の発生を抑えることができるため、液晶残渣に起因する液晶の配向不良を防止することができる。 By using the method for manufacturing a liquid crystal display element of the present invention, it is possible to suppress the generation of liquid crystal residues in the injection port, and thus it is possible to prevent liquid crystal alignment defects due to the liquid crystal residues.

さらに、注入口端部において液晶残渣の発生を抑えることができるため、シール材と封口材との密着力を改善することができ、外部からの水分等の浸入を防止することができる。 Furthermore, since generation | occurrence | production of a liquid-crystal residue can be suppressed in an injection hole edge part, the adhesive force of a sealing material and a sealing material can be improved, and the penetration | invasion of the water | moisture content from the outside can be prevented.

注入口周辺の液晶を液晶溶解溶剤により溶解した後、注入口周辺に付着した液晶溶解溶剤に気体を吹き付け、液晶溶解溶剤を飛散させれば、液晶が溶解した液晶溶解溶剤の液晶溶解溶剤置換液への持ち込み量を減少させることができるため、液晶溶解溶剤置換液を乾燥した後の液晶残渣の発生をより効果的に抑えることができる。 After dissolving the liquid crystal around the inlet with the liquid crystal dissolving solvent, if the gas is blown to the liquid crystal dissolving solvent attached around the inlet and the liquid crystal dissolving solvent is scattered, the liquid crystal dissolving solvent replacement solution of the liquid crystal dissolving solvent in which the liquid crystal is dissolved Therefore, the generation of liquid crystal residues after drying the liquid crystal dissolving solvent replacement liquid can be more effectively suppressed.

液晶溶解溶剤の温度が液晶溶解溶剤置換液の温度よりも高い場合において、液晶溶解溶剤に吹き付ける気体の温度を液晶溶解溶剤置換液の温度以下にしておけば、気体が吹き付けられる部材の温度が低下し、液晶溶解溶剤置換液に高温の部材が浸漬されなくなるため、液晶溶解溶剤置換液の揮発を防止することができる。 When the temperature of the liquid crystal dissolving solvent is higher than the temperature of the liquid crystal dissolving solvent replacement liquid, if the temperature of the gas sprayed on the liquid crystal dissolving solvent is lower than the temperature of the liquid crystal dissolving solvent replacement liquid, the temperature of the member to which the gas is sprayed decreases. In addition, since the high temperature member is not immersed in the liquid crystal dissolving solvent replacement liquid, volatilization of the liquid crystal dissolving solvent replacement liquid can be prevented.

液晶溶解溶剤として、イソプロピルアルコールを用い、液晶溶解溶剤置換液として、液晶溶解溶剤より沸点が低いフロン系溶剤を用いれば、液晶溶解溶剤を液晶溶解溶剤置換液に置換した後、注入口周辺に付着した液晶溶解溶剤置換液を短時間に乾燥させることができるため、液晶残渣の発生をより効果的に抑えることができる。 If isopropyl alcohol is used as the liquid crystal dissolving solvent and a fluorocarbon solvent having a boiling point lower than that of the liquid crystal dissolving solvent is used as the liquid crystal dissolving solvent replacement liquid, the liquid crystal dissolving solvent is replaced with the liquid crystal dissolving solvent replacement liquid and then adhered around the inlet. Since the liquid crystal dissolving solvent replacement liquid can be dried in a short time, the generation of liquid crystal residues can be suppressed more effectively.

使用済みの液晶溶解溶剤置換液から液晶溶解溶剤と液晶を除去し、純度の高い液晶溶解溶剤置換液として再利用すれば、液晶溶解溶剤置換液の廃棄処理のコスト削減や環境負荷の低減が可能となる。 By removing the liquid crystal dissolving solvent and the liquid crystal from the used liquid crystal dissolving solvent replacement liquid and reusing it as a high purity liquid crystal dissolving solvent replacement liquid, it is possible to reduce the cost of disposal of the liquid crystal dissolving solvent replacement liquid and the environmental burden. It becomes.

本発明の第１の実施形態における液晶表示素子の製造方法を示す平面図である。It is a top view which shows the manufacturing method of the liquid crystal display element in the 1st Embodiment of this invention. 本発明の第１の実施形態における液晶表示素子の製造方法を示す平面図である。It is a top view which shows the manufacturing method of the liquid crystal display element in the 1st Embodiment of this invention. 本発明の第１の実施形態における液晶表示素子の製造方法を示す平面図である。It is a top view which shows the manufacturing method of the liquid crystal display element in the 1st Embodiment of this invention. 本発明の第１の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤に液晶表示素子を浸漬している状況を示している。It is sectional drawing which shows the manufacturing method of the liquid crystal display element in the 1st Embodiment of this invention, and has shown the condition where the liquid crystal display element is immersed in the liquid-crystal dissolving solvent. 本発明の第１の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤と溶剤に溶けている液晶を気体を吹き付けて除去する状況を示している。It is sectional drawing which shows the manufacturing method of the liquid crystal display element in the 1st Embodiment of this invention, and has shown the condition which sprays and removes the liquid crystal dissolved solvent and the liquid crystal dissolved in the solvent. 本発明の第１の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤置換液に液晶表示素子を浸漬している状況を示している。It is sectional drawing which shows the manufacturing method of the liquid crystal display element in the 1st Embodiment of this invention, and has shown the condition where the liquid crystal display element is immersed in the liquid-crystal-dissolving solvent substitution liquid. 本発明の第２の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤置換液に液晶表示素子を浸漬している状況を示している。It is sectional drawing which shows the manufacturing method of the liquid crystal display element in the 2nd Embodiment of this invention, and has shown the condition where the liquid crystal display element is immersed in the liquid-crystal-dissolving solvent substitution liquid. 本発明の第３の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤置換液に液晶表示素子を浸漬している状況を示している。It is sectional drawing which shows the manufacturing method of the liquid crystal display element in the 3rd Embodiment of this invention, and has shown the condition where the liquid crystal display element is immersed in the liquid-crystal-dissolving solvent substitution liquid. 本発明の液晶表示素子の製造方法を使用して製造された液晶表示素子を組み込んだ液晶表示装置の平面図である。It is a top view of the liquid crystal display device incorporating the liquid crystal display element manufactured using the manufacturing method of the liquid crystal display element of this invention. 図７に示す液晶表示装置のＡ−Ａ断面図である。It is AA sectional drawing of the liquid crystal display device shown in FIG. 本発明の一実施形態における液晶表示素子の製造工程と液晶溶解溶剤置換液の再生処理工程を示す図である。It is a figure which shows the manufacturing process of the liquid crystal display element in one Embodiment of this invention, and the reproduction | regeneration processing process of a liquid-crystal-dissolving solvent substitution liquid. 従来技術における液晶表示素子の製造方法を示す平面図である。It is a top view which shows the manufacturing method of the liquid crystal display element in a prior art. 従来技術における液晶表示素子の製造方法を示す平面図である。It is a top view which shows the manufacturing method of the liquid crystal display element in a prior art.

図１−１、図１−２、図１−３は、本発明の第１の実施形態における液晶表示素子の製造方法を示す平面図である。図２は、本発明の第１の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤に液晶表示素子を浸漬している状況を示している。図３は、本発明の第１の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤と溶剤に溶けている液晶を気体を吹き付けて除去する状況を示している。図４は、本発明の第１の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤置換液に液晶表示素子を浸漬している状況を示している。 FIGS. 1-1, 1-2, and 1-3 are plan views showing a method for manufacturing a liquid crystal display device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a method for manufacturing a liquid crystal display element according to the first embodiment of the present invention, and shows a situation where the liquid crystal display element is immersed in a liquid crystal dissolving solvent. FIG. 3 is a cross-sectional view showing a method for manufacturing a liquid crystal display element according to the first embodiment of the present invention, and shows a state where a liquid crystal-dissolving solvent and liquid crystal dissolved in the solvent are removed by blowing a gas. FIG. 4 is a cross-sectional view showing a method for manufacturing a liquid crystal display element according to the first embodiment of the present invention, and shows a situation where the liquid crystal display element is immersed in a liquid crystal dissolving solvent replacement liquid.

本発明の第１の実施形態は、第１の基板１として、強誘電性液晶に所定の電圧を印加する半導体回路と画素電極を有するシリコン基板からなる集積回路搭載基板を使用し、第２の基板６として、酸化インジウムスズ（ＩＴＯ）膜からなる透明電極を有するガラス基板を使用した、ＬＣＯＳ（ＬｉｑｕｉｄＣｒｙｓｔａｌＯｎＳｉｌｉｃｏｎ）構造を有する液晶表示パネルの製造に本発明を適用した実施例である。ＬＣＯＳ構造の液晶表示パネルは、マイクロディスプレイに最適であり、本発明を適用するのに適している。 In the first embodiment of the present invention, an integrated circuit mounting substrate made of a silicon substrate having a pixel circuit and a semiconductor circuit that applies a predetermined voltage to a ferroelectric liquid crystal is used as the first substrate 1. In this embodiment, the present invention is applied to the manufacture of a liquid crystal display panel having an LCOS (Liquid Crystal On Silicon) structure using a glass substrate having a transparent electrode made of an indium tin oxide (ITO) film as the substrate 6. A liquid crystal display panel having an LCOS structure is optimal for a micro display and is suitable for application of the present invention.

まず、第１の基板１と第２の基板６とをシール材１１により１マイクロメートル（μｍ）程度の間隔で貼り合せて空液晶表示パネルを作成した後、シール材１１の一部に設けた注入口１４近傍の第２の基板６上に強誘電性液晶１３を滴下し、真空および加熱状態において、強誘電性液晶１３を注入口１４より空液晶表示パネル内に毛細管現象を利用して注入し、図１−１（ａ）に示す状態の液晶表示パネルを得る。 First, after the first substrate 1 and the second substrate 6 were bonded to each other with a sealant 11 at an interval of about 1 micrometer (μm) to create an empty liquid crystal display panel, the first substrate 1 and the second substrate 6 were provided on a part of the sealant 11. A ferroelectric liquid crystal 13 is dropped on the second substrate 6 near the inlet 14, and the ferroelectric liquid crystal 13 is injected into the empty liquid crystal display panel from the inlet 14 into the empty liquid crystal display panel using a capillary phenomenon in a vacuum and a heated state. Then, the liquid crystal display panel in the state shown in FIG.

強誘電性液晶１３は、注入口１４から空液晶表示パネル内の表示領域３１へと注入されるが、この時、シール材１１の外周側に位置する第１の基板１と第２の基板６との隙間にギャップ液晶残り３５が発生し、さらに、第１の基板１と第２の基板６が互いにオフセットした部分の第２の基板６上に第２の基板上液晶残り３６が発生する。 The ferroelectric liquid crystal 13 is injected from the injection port 14 into the display region 31 in the empty liquid crystal display panel. At this time, the first substrate 1 and the second substrate 6 positioned on the outer peripheral side of the sealing material 11. A gap liquid crystal residue 35 is generated in the gap between the first substrate 1 and the second substrate 6 on the second substrate 6 where the first substrate 1 and the second substrate 6 are offset from each other.

次に、ギャップ液晶残り３５と第２の基板上液晶残り３６が発生した液晶表示パネルを、イソプロピルアルコールに所定時間浸漬してから取り出すことで、図１−１（ｂ）に示す状態の液晶表示パネルを得る。尚、イソプロピルアルコールに浸漬させるのは、液晶表示パネル全体ではなく、注入口１４周辺のみであっても良い。 Next, the liquid crystal display panel in which the gap liquid crystal residue 35 and the second substrate liquid crystal residue 36 are generated is dipped in isopropyl alcohol for a predetermined time and then taken out, whereby the liquid crystal display in the state shown in FIG. Get the panel. In addition, what is immersed in isopropyl alcohol may not be the whole liquid crystal display panel but the injection port 14 periphery.

液晶表示パネルをイソプロピルアルコールに浸漬する工程は、例えば、図２に示すように、イソプロピルアルコールからなる液晶溶解溶剤４２を収容した液晶溶解溶剤容器４１に、液晶表示パネルカセット４６とパネル保持パイプ４７からなる液晶表示パネル浸漬用カセット４５に液晶表示パネルを保持したものを投入することにより行う。 For example, as shown in FIG. 2, the step of immersing the liquid crystal display panel in isopropyl alcohol is carried out from a liquid crystal display panel cassette 46 and a panel holding pipe 47 into a liquid crystal dissolution solvent container 41 containing a liquid crystal dissolution solvent 42 made of isopropyl alcohol. The liquid crystal display panel dipping cassette 45 is loaded with the one holding the liquid crystal display panel.

イソプロピルアルコールは強誘電性液晶を溶解する性質があり、ギャップ液晶残り３５と第２の基板上液晶残り３６は溶解される。しかし、この時、ギャップ液晶残り３５は、基板間の狭小な隙間にあることからイソプロピルアルコールに触れ難く、溶解し難いため、完全には除去されない。尚、第２の基板上液晶残り３６は、イソプロピルアルコールに触れ易いため、ほとんどが溶解する。 Isopropyl alcohol has the property of dissolving the ferroelectric liquid crystal, and the gap liquid crystal residue 35 and the second substrate liquid crystal residue 36 are dissolved. However, at this time, the gap liquid crystal remaining 35 is not completely removed because it is difficult to touch and dissolve isopropyl alcohol because it is in a narrow gap between the substrates. The remaining liquid crystal residue 36 on the second substrate is easy to touch isopropyl alcohol, so that most of it is dissolved.

また、一方では、注入口１４内にある注入口内液晶１２の一部がイソプロピルアルコールに溶解する。しかし、注入口１４内は狭小であるため、イソプロピルアルコールが浸透し難く、完全には除去されない。 On the other hand, a part of the liquid crystal 12 in the injection port in the injection port 14 is dissolved in isopropyl alcohol. However, since the inside of the injection port 14 is narrow, it is difficult for isopropyl alcohol to permeate and is not completely removed.

尚、液晶溶解溶剤４２の温度は、適宜設定すれば良いが、４０〜６０℃程度とすれば、液晶の溶解を室温より早くしつつも、液晶の溶解量を制御し易い範囲とすることができる。 The temperature of the liquid crystal dissolution solvent 42 may be set as appropriate. However, if the temperature is about 40 to 60 ° C., the dissolution amount of the liquid crystal can be easily controlled while the dissolution of the liquid crystal is faster than room temperature. it can.

次に、液晶表示パネルを液晶表示パネル浸漬用カセット４５に入れた状態のまま液晶溶解溶剤容器４１から取り出し、図３に示すように、ガス噴射ノズル４８から液晶溶解溶剤除去ガス４９として窒素（Ｎ２）ガスを液晶表示パネルと液晶表示パネル浸漬用カセット４５に噴きつけ、付着している液晶溶解溶剤４２を飛散させることで、液晶表示パネルと液晶表示パネル浸漬用カセット４５に付着する液晶溶解溶剤４２の量を減少させる。尚、液晶溶解溶剤除去ガス４９を吹き付けるのは、液晶表示パネルと液晶表示パネル浸漬用カセット４５のうち、液晶溶解溶剤置換液５２に浸漬する部分のみであっても良い。 Next, the liquid crystal display panel is taken out from the liquid crystal dissolving solvent container 41 while being put in the liquid crystal display panel immersion cassette 45, and as shown in FIG. ) The liquid crystal dissolving solvent 42 adhering to the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 is sprayed by spraying gas on the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 to disperse the adhering liquid crystal dissolving solvent 42. Reduce the amount of. The liquid crystal dissolving solvent removal gas 49 may be sprayed only on the portion of the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 that is immersed in the liquid crystal dissolving solvent replacement liquid 52.

次に、付着する液晶溶解溶剤４２の量を減少させた液晶表示パネルと液晶表示パネル浸漬用カセット４５を、代替フロンであるバートレル（登録商標）に所定時間浸漬してから取り出し、バートレルを乾燥させることで、図１−２（ｃ）に示す状態の液晶表示パネルを得る。尚、バートレルに浸漬させるのは、液晶表示パネル全体ではなく、注入口１４周辺のみであっても良い。 Next, the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 in which the amount of the adhering liquid crystal dissolving solvent 42 is reduced are immersed for a predetermined time in an alternative chlorofluorocarbon (Berrel) (registered trademark) and then taken out to dry the bartrel. Thus, the liquid crystal display panel in the state shown in FIG. It should be noted that the immersion in the bartrel may be performed not only on the entire liquid crystal display panel but only around the inlet 14.

液晶表示パネルと液晶表示パネル浸漬用カセット４５をバートレルに浸漬する工程は、例えば、図４に示すように、バートレルからなる液晶溶解溶剤置換液５２を収容した液晶溶解溶剤置換液容器５１に、液晶表示パネルと液晶表示パネル浸漬用カセット４５を投入することにより行う。 The step of immersing the liquid crystal display panel and the liquid crystal display panel dipping cassette 45 in the bartrel is performed, for example, in a liquid crystal dissolving solvent replacement liquid container 51 containing a liquid crystal dissolving solvent replacement liquid 52 made of bartrel as shown in FIG. The display panel and the liquid crystal display panel immersion cassette 45 are inserted.

この時、液晶溶解溶剤置換液５２は、予め一定の温度に保たれた状態となっているが、液晶溶解溶剤置換液５２に投入される液晶表示パネルと液晶表示パネル浸漬用カセット４５の温度が、液晶溶解溶剤置換液５２の温度よりも高いと、液晶溶解溶剤置換液５２の温度が上昇して液晶溶解溶剤置換液５２の蒸発が促進されてしまうため、液晶表示パネルと液晶表示パネル浸漬用カセット４５は、液晶溶解溶剤置換液５２に投入する前に、予め液晶溶解溶剤置換液５２の温度以下に調整しておくのが好ましい。温度を調整する方法としては、例えば、図３に示す工程で液晶表示パネルと液晶表示パネル浸漬用カセット４５に吹き付ける液晶溶解溶剤除去ガス４９の温度を、液晶溶解溶剤置換液５２の温度以下に調整しておくことが挙げられる。このようにすれば、液晶表示パネルと液晶表示パネル浸漬用カセット４５の温度を調整する作業を別工程として行う必要は無い。尚、温度を調整するのは、液晶表示パネルと液晶表示パネル浸漬用カセット４５のうち、液晶溶解溶剤置換液５２に浸漬する部分のみであっても良い。 At this time, the liquid crystal dissolving solvent replacement liquid 52 is in a state of being kept at a predetermined temperature in advance, but the temperature of the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 charged in the liquid crystal dissolving solvent replacement liquid 52 is If the temperature of the liquid crystal dissolving solvent replacement liquid 52 is higher than the temperature of the liquid crystal dissolving solvent replacement liquid 52, the temperature of the liquid crystal dissolving solvent replacement liquid 52 rises and the evaporation of the liquid crystal dissolving solvent replacement liquid 52 is promoted. The cassette 45 is preferably adjusted in advance to a temperature equal to or lower than the temperature of the liquid crystal dissolving solvent replacement liquid 52 before being introduced into the liquid crystal dissolving solvent replacement liquid 52. As a method for adjusting the temperature, for example, the temperature of the liquid crystal dissolving solvent removal gas 49 sprayed to the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 in the step shown in FIG. It is mentioned to keep. In this way, it is not necessary to perform the operation of adjusting the temperature of the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 as a separate process. The temperature may be adjusted only in the portion of the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 that is immersed in the liquid crystal dissolving solvent replacement liquid 52.

液晶溶解溶剤置換液容器５１には、液晶溶解溶剤置換液５２の蒸発を防止するために、液晶溶解溶剤置換液蒸発防止冷却部５３と、液晶溶解溶剤置換液蒸発防止蓋５５とが設けられている。液晶溶解溶剤置換液蒸発防止冷却部５３は、液晶溶解溶剤置換液容器５１の外壁上部に近接乃至は密着して設けられ、内部に冷媒を循環させることで、蒸発したバートレルを液晶溶解溶剤置換液容器５１の外壁越しに冷却し、液体として析出（結露）させる役割を果たす。液晶溶解溶剤置換液蒸発防止蓋５５は、液晶溶解溶剤置換液容器５１の上部開口を塞ぐもので、蒸発したバートレルが液晶溶解溶剤置換液容器５１の外へ拡散するのを防止する役割を果たす。 The liquid crystal dissolving solvent replacement liquid container 51 is provided with a liquid crystal dissolving solvent replacement liquid evaporation preventing cooling unit 53 and a liquid crystal dissolving solvent replacement liquid evaporation preventing lid 55 in order to prevent evaporation of the liquid crystal dissolving solvent replacement liquid 52. Yes. The liquid crystal dissolving solvent replacement liquid evaporation preventing cooling unit 53 is provided close to or in close contact with the upper part of the outer wall of the liquid crystal dissolving solvent replacement liquid container 51 and circulates the refrigerant in the liquid crystal so that the evaporated bartrel is liquid crystal dissolving solvent replacement liquid. It cools through the outer wall of the container 51 and plays a role of depositing (condensation) as a liquid. The liquid crystal dissolution solvent replacement liquid evaporation prevention lid 55 closes the upper opening of the liquid crystal dissolution solvent replacement liquid container 51 and plays a role of preventing the evaporated bartrel from diffusing out of the liquid crystal dissolution solvent replacement liquid container 51.

バートレルはイソプロピルアルコールを溶解する性質（相溶性）があるため、液晶表示パネルと液晶表示パネル浸漬用カセット４５に付着していた液晶溶解溶剤４２は、そこに溶け込んでいた強誘電性液晶１３と共に液晶溶解溶剤置換液５２により置換される。バートレルは、強誘電性液晶を溶解しない性質のため、乾燥する間に強誘電性液晶を溶解することはない。また、バートレルは、イソプロピルアルコールよりも沸点が低く、短時間に乾燥させることができるため、仮にバートレルに強誘電性液晶を溶解する性質があったとしても、乾燥するまでの間に強誘電性液晶が溶解される量、即ち、乾燥した際に析出する残渣の量は減少する。 Since the bartrel has a property (compatibility) for dissolving isopropyl alcohol, the liquid crystal dissolving solvent 42 attached to the liquid crystal display panel and the liquid crystal display panel immersion cassette 45 is liquid crystal together with the ferroelectric liquid crystal 13 dissolved therein. The solvent is replaced by the dissolving solvent replacement liquid 52. Since the bartrel does not dissolve the ferroelectric liquid crystal, it does not dissolve the ferroelectric liquid crystal during drying. In addition, since Bertlell has a lower boiling point than isopropyl alcohol and can be dried in a short time, even if it has the property of dissolving ferroelectric liquid crystal in Bertrell, it must be a ferroelectric liquid crystal before drying. Is dissolved, that is, the amount of residue that precipitates when dried.

尚、液晶溶解溶剤置換液５２の温度は、適宜設定すれば良いが、室温である２０〜２５℃程度とすれば、液晶溶解溶剤４２の置換を良好に行いつつ、液晶溶解溶剤置換液５２の蒸発を最小限に抑えることができる。 The temperature of the liquid crystal dissolving solvent replacement liquid 52 may be set as appropriate. However, when the temperature is about 20 to 25 ° C., which is room temperature, the liquid crystal dissolving solvent replacement liquid 52 is satisfactorily replaced. Evaporation can be minimized.

また、バートレルは揮発性が高く乾燥しやすいが、減圧雰囲気（真空雰囲気）にて乾燥を行えば、揮発性が高まるため、乾燥時間をより短縮することができる。 In addition, although the bartrel is highly volatile and easy to dry, if the drying is performed in a reduced pressure atmosphere (vacuum atmosphere), the volatility increases, so that the drying time can be further shortened.

以上により、液晶表示パネルに付着する液晶溶解溶剤置換液５２を乾燥させた時点では、図１−２（ｃ）に示すように、注入口１４周辺には強誘電性液晶の残渣が存在しない状態となり、特に、注入口１４内の表示領域３１に近い部分には、残渣の無い清浄な液晶除去空間部３９が形成される。 As described above, when the liquid crystal dissolving solvent replacement liquid 52 adhering to the liquid crystal display panel is dried, as shown in FIG. 1-2C, there is no ferroelectric liquid crystal residue around the inlet 14. In particular, a clean liquid crystal removal space 39 having no residue is formed near the display area 31 in the inlet 14.

次に、図１−２（ｄ）に示すように、第１の基板１と第２の基板６とシール材１１とに良好に接触する状態で注入口１４に封口材１５を塗布し、紫外線（ＵＶ光）を照射して硬化させる。 Next, as shown in FIG. 1-2 (d), a sealing material 15 is applied to the injection port 14 in good contact with the first substrate 1, the second substrate 6, and the sealing material 11, and ultraviolet rays are applied. (UV light) is irradiated and cured.

この時、注入口１４周辺には、強誘電性液晶の残渣が無いため、封口材１５は、第１の基板１と第２の基板６とシール材１１とに良好に密着する。また、注入口１４に封口材１５を塗布した時点では、液晶除去空間部３９には封口材１５が完全に充填されず、封口材１５と強誘電性液晶１３との間には僅かに隙間が形成された状態となっており、さらに、その隙間にある配向膜上には強誘電性液晶の残渣が存在しないため、封口材１５が強誘電性液晶１３に直接接触する、あるいは、残渣を介して強誘電性液晶１３に溶け込むことはなく、強誘電性液晶１３を劣化させることはない。この効果は、液晶溶解溶剤置換液５２により、液晶溶解溶剤４２とそこに溶け込んでいる強誘電性液晶１３を完全に置換し、さらに、液晶溶解溶剤置換液５２を短時間にしっかり乾燥できていることによるものである。 At this time, since there is no ferroelectric liquid crystal residue around the injection port 14, the sealing material 15 adheres well to the first substrate 1, the second substrate 6, and the sealing material 11. Further, when the sealing material 15 is applied to the injection port 14, the liquid crystal removal space 39 is not completely filled with the sealing material 15, and there is a slight gap between the sealing material 15 and the ferroelectric liquid crystal 13. Further, since the residue of the ferroelectric liquid crystal does not exist on the alignment film in the gap, the sealing material 15 is in direct contact with the ferroelectric liquid crystal 13 or through the residue. Therefore, the ferroelectric liquid crystal 13 is not dissolved, and the ferroelectric liquid crystal 13 is not deteriorated. This effect is that the liquid crystal dissolving solvent replacement liquid 52 completely replaces the liquid crystal dissolving solvent 42 and the ferroelectric liquid crystal 13 dissolved therein, and the liquid crystal dissolving solvent replacement liquid 52 can be dried firmly in a short time. It is because.

次に、図１−３（ｅ）に示すように、液晶表示パネルの熱処理を行い、強誘電性液晶１３を等方相液体状態にして低粘度化と膨張をさせ、膨張した強誘電性液晶１３により液晶除去空間部３９を埋めて、強誘電性液晶１３と封口材１５とを接触させる。その後、液晶表示パネルを徐冷し、強誘電性液晶１３を規則正しく配向させることで、液晶表示パネルが完成する。
この時、注入口１４内には強誘電性液晶の残渣が存在していないため、残渣に起因する強誘電性液晶１３の配向不良が起こることはない。 Next, as shown in FIG. 1-3 (e), the liquid crystal display panel is heat-treated to make the ferroelectric liquid crystal 13 into an isotropic liquid state, thereby reducing the viscosity and expanding the liquid crystal display panel. 13 fills the liquid crystal removal space 39 and brings the ferroelectric liquid crystal 13 and the sealing material 15 into contact with each other. Thereafter, the liquid crystal display panel is slowly cooled, and the ferroelectric liquid crystal 13 is regularly aligned to complete the liquid crystal display panel.
At this time, since there is no ferroelectric liquid crystal residue in the injection port 14, the alignment defect of the ferroelectric liquid crystal 13 due to the residue does not occur.

図７は、本発明の液晶表示素子の製造方法を使用して製造された液晶表示素子を組み込んだ液晶表示装置の平面図である。図８は、図７に示す液晶表示装置のＡ−Ａ断面図である。本発明の製造方法を用いて製造された液晶表示パネルは、例えば、図７と図８に示す構造の液晶表示装置となる。 FIG. 7 is a plan view of a liquid crystal display device incorporating a liquid crystal display element manufactured using the method for manufacturing a liquid crystal display element of the present invention. 8 is a cross-sectional view taken along the line AA of the liquid crystal display device shown in FIG. The liquid crystal display panel manufactured using the manufacturing method of the present invention is, for example, a liquid crystal display device having the structure shown in FIGS.

液晶表示パネルの第１の基板１上には画素電極（第１の電極）２が設けられ、第２の基板６上には対向電極（第２の電極）７が設けられている。液晶表示パネルは、周辺回路との電気的接続を行うためのコネクタ２３を備えた外部回路基板２１に両面接着テープ２２を介して固定されている。外部回路基板２１と液晶表示パネルの第２の基板６とは、超音波ワイヤボンディング法を用いて配設されたアルミニウム細線などからなる導通ワイヤ２５を介して電気的に接続されている。導通ワイヤ２５は、ワイヤ保護樹脂２６により保護されている。液晶表示パネルの第２の基板６上にある対向電極７と外部回路基板２１とは、導電性接着剤などからなる上下導通部材１６を介して電気的に接続されている。 A pixel electrode (first electrode) 2 is provided on the first substrate 1 of the liquid crystal display panel, and a counter electrode (second electrode) 7 is provided on the second substrate 6. The liquid crystal display panel is fixed to an external circuit board 21 having a connector 23 for electrical connection with peripheral circuits via a double-sided adhesive tape 22. The external circuit board 21 and the second substrate 6 of the liquid crystal display panel are electrically connected via a conductive wire 25 made of an aluminum fine wire or the like disposed using an ultrasonic wire bonding method. The conductive wire 25 is protected by a wire protective resin 26. The counter electrode 7 on the second substrate 6 of the liquid crystal display panel and the external circuit substrate 21 are electrically connected via a vertical conduction member 16 made of a conductive adhesive or the like.

図５は、本発明の第２の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤置換液に液晶表示素子を浸漬している状況を示している。実施例１との相違点として、液晶溶解溶剤置換液容器５１には、液晶溶解溶剤置換液５２の蒸発を防止するための液晶溶解溶剤置換液蒸発防止冷却部５３を設けていない。実施例１では、液晶溶解溶剤置換液容器５１に液晶溶解溶剤置換液蒸発防止冷却部５３を設けることにより、液晶溶解溶剤置換液５２の蒸発を防止することができるが、湿度が高い場合には、液晶溶解溶剤置換液蒸発防止冷却部５３により空気が冷却され、空気中の水分が結露して水滴となり、液晶溶解溶剤置換液容器５１の壁面を伝って垂れ落ち、水滴が液晶溶解溶剤置換液５２に混入し、混入した水分が最終的に液晶表示パネル内に浸入する、あるいは、液晶溶解溶剤置換液５２の蒸発がし難くなる恐れがあるが、本実施例では、液晶溶解溶剤置換液蒸発防止冷却部５３を設けていないため、そのようなことはない。 FIG. 5 is a cross-sectional view showing a method for manufacturing a liquid crystal display element according to the second embodiment of the present invention, and shows a situation where the liquid crystal display element is immersed in a liquid crystal dissolving solvent replacement liquid. As a difference from the first embodiment, the liquid crystal dissolving solvent replacement liquid container 51 is not provided with the liquid crystal dissolving solvent replacement liquid evaporation preventing cooling unit 53 for preventing the liquid crystal dissolving solvent replacement liquid 52 from evaporating. In the first embodiment, the liquid crystal dissolving solvent replacement liquid container 51 is provided with the liquid crystal dissolving solvent replacement liquid evaporation preventing cooling unit 53 to prevent the liquid crystal dissolving solvent replacement liquid 52 from evaporating. However, when the humidity is high Then, the air is cooled by the liquid crystal dissolving solvent replacement liquid evaporation prevention cooling unit 53, moisture in the air is condensed to form water droplets, dripping down the wall surface of the liquid crystal dissolving solvent replacement liquid container 51, and the water droplets are liquid crystal dissolving solvent replacement liquid. In this embodiment, the liquid crystal dissolved solvent replacement liquid evaporates. However, in this embodiment, the liquid crystal dissolved solvent replacement liquid 52 may be difficult to evaporate. Since the prevention cooling unit 53 is not provided, this is not the case.

また、代替フロンであるバートレルには水が溶解せず、さらに、比重が水の方が軽いことから、液晶溶解溶剤置換液５２の上層に水の層が形成され、液晶表示パネル浸漬用カセット４５を液晶溶解溶剤置換液５２から引き上げる際に水が付着してしまう恐れもあるが、本実施例では水の層が形成されないため、そのようなこともない。 In addition, since water is not dissolved in the alternative chlorofluorocarbon, and the specific gravity is lighter than water, a water layer is formed in the upper layer of the liquid crystal dissolving solvent replacement liquid 52, and the liquid crystal display panel immersion cassette 45. Although there is a possibility that water may adhere when the liquid is lifted from the liquid crystal dissolving solvent replacement liquid 52, this is not the case because a water layer is not formed in this embodiment.

図６は、本発明の第３の実施形態における液晶表示素子の製造方法を示す断面図で、液晶溶解溶剤置換液に液晶表示素子を浸漬している状況を示している。実施例１との相違点として、液晶溶解溶剤置換液容器５１には、液晶溶解溶剤置換液５２の蒸発を防止するための液晶溶解溶剤置換液蒸発防止冷却部５３を設けず、液晶溶解溶剤置換液容器５１の底部には、超音波洗浄装置５７を設けている。超音波洗浄装置５７から液晶溶解溶剤置換液５２に超音波を作用させることにより、液晶表示パネルに付着する液晶溶解溶剤４２とそこに溶け込んだ強誘電性液晶１３の除去を効率的に行うことができる。 FIG. 6 is a cross-sectional view showing a method for manufacturing a liquid crystal display element according to the third embodiment of the present invention, and shows a situation where the liquid crystal display element is immersed in a liquid crystal dissolving solvent replacement solution. As a difference from the first embodiment, the liquid crystal dissolving solvent replacement liquid container 51 is not provided with the liquid crystal dissolving solvent replacement liquid evaporation prevention cooling unit 53 for preventing the liquid crystal dissolving solvent replacement liquid 52 from evaporating, and the liquid crystal dissolving solvent replacement liquid container 51 is not provided. An ultrasonic cleaning device 57 is provided at the bottom of the liquid container 51. By applying ultrasonic waves from the ultrasonic cleaning device 57 to the liquid crystal dissolving solvent replacement liquid 52, the liquid crystal dissolving solvent 42 adhering to the liquid crystal display panel and the ferroelectric liquid crystal 13 dissolved therein can be efficiently removed. it can.

また、超音波洗浄装置４２には、液晶溶解溶剤置換液５２の温度を任意に調節するための温度調節機能が設けられている。例えば、液晶表示パネル浸漬用カセット４５と液晶表示パネルとを液晶溶解溶剤置換液５２に浸漬していない時は、液晶溶解溶剤置換液５２を２５℃に保つように加温と冷却を実施し、液晶表示パネル浸漬用カセット４５と液晶表示パネルとを液晶溶解溶剤置換液５２に浸漬し、超音波洗浄装置４２を使用している時には、超音波洗浄装置４２から発生する熱を相殺する形で概ね冷却を行なう。このように、液晶溶解溶剤置換液５２の温度を適切に管理することで、液晶溶解溶剤置換液５２による液晶溶解溶剤４２の置換を短時間に効率良く行うことができる。 Further, the ultrasonic cleaning device 42 is provided with a temperature adjusting function for arbitrarily adjusting the temperature of the liquid crystal dissolving solvent replacement liquid 52. For example, when the liquid crystal display panel immersion cassette 45 and the liquid crystal display panel are not immersed in the liquid crystal dissolving solvent replacement liquid 52, heating and cooling are performed so that the liquid crystal dissolving solvent replacement liquid 52 is maintained at 25 ° C. When the liquid crystal display panel immersion cassette 45 and the liquid crystal display panel are immersed in the liquid crystal dissolving solvent replacement liquid 52 and the ultrasonic cleaning device 42 is used, the heat generated from the ultrasonic cleaning device 42 is generally offset. Cool down. As described above, by appropriately managing the temperature of the liquid crystal dissolving solvent replacement liquid 52, the liquid crystal dissolving solvent 42 can be efficiently replaced in a short time by the liquid crystal dissolving solvent replacement liquid 52.

図９は、本発明の一実施形態における液晶表示素子の製造工程と液晶溶解溶剤置換液の再生処理工程を示す図である。工程１から工程６は、強誘電性液晶表示パネルの製造工程を示し、工程７は、強誘電性液晶表示パネルを液晶表示装置とする工程を示し、工程８から工程１０は、液晶溶解溶剤置換液の再生工程を示している。図９に示す工程１から工程６を行うことにより強誘電性液晶表示パネルを製造した後、工程７を行うことにより液晶表示装置を製造する一方、それらとは独立した工程として、工程８から工程１０の液晶溶解溶剤置換液の再生工程を行う。 FIG. 9 is a diagram showing a liquid crystal display element manufacturing process and a liquid crystal dissolving solvent replacement liquid regeneration process in an embodiment of the present invention. Steps 1 to 6 show a manufacturing process of a ferroelectric liquid crystal display panel, Step 7 shows a step of using the ferroelectric liquid crystal display panel as a liquid crystal display device, and Steps 8 to 10 show replacement of a liquid crystal dissolving solvent. The liquid regeneration process is shown. After manufacturing a ferroelectric liquid crystal display panel by performing steps 1 to 6 shown in FIG. 9, a liquid crystal display device is manufactured by performing step 7, while steps 8 to 8 are performed as independent steps. The reproduction | regeneration process of 10 liquid crystal dissolving solvent substitution liquid is performed.

工程８では、まず、液晶溶解溶剤４２が溶け込んだ使用済みの液晶溶解溶剤置換液５２に所定量の水を混入させることで、液晶溶解溶剤置換液５２に溶け込んだ液晶溶解溶剤４２であるイソプロピルアルコールのみを水に溶解させると同時に、水とは相溶性の無い液晶溶解溶剤置換液５２であるバートレルから、イソプロピルアルコールが溶解した水（分離処理液）を分離させる。その後、液晶溶解溶剤置換液５２と分離処理液と強誘電性液晶との混合液から、液晶溶解溶剤置換液５２のみを選択的に抽出、あるいは、分離処理液のみを選択的に除去することにより、液晶溶解溶剤４２の濃度が低い液晶溶解溶剤置換液５２を回収する。尚、バートレルと水（分離処理液）とは、比重の違いから層状に分離されるため、何れか一方を選択的に抽出あるいは除去することは容易に行える。 In step 8, first, a predetermined amount of water is mixed in the used liquid crystal dissolving solvent replacement liquid 52 in which the liquid crystal dissolving solvent 42 is dissolved, so that isopropyl alcohol which is the liquid crystal dissolving solvent 42 dissolved in the liquid crystal dissolving solvent replacement liquid 52 is obtained. Only water is dissolved in water, and at the same time, water (separation treatment liquid) in which isopropyl alcohol is dissolved is separated from bartrel which is a liquid crystal dissolving solvent replacement liquid 52 which is not compatible with water. Thereafter, by selectively extracting only the liquid crystal dissolving solvent replacement liquid 52 from the liquid mixture of the liquid crystal dissolving solvent replacement liquid 52, the separation processing liquid, and the ferroelectric liquid crystal, or by selectively removing only the separation processing liquid. The liquid crystal dissolving solvent replacement liquid 52 having a low concentration of the liquid crystal dissolving solvent 42 is recovered. Since the bartrel and water (separation treatment liquid) are separated into layers due to the difference in specific gravity, it is easy to selectively extract or remove either one.

工程９では、工程８により回収された液晶溶解溶剤置換液５２を蒸留し、混入している強誘電性液晶と残った水分とを液晶溶解溶剤置換液５２から分離させ、純度の高い液晶溶解溶剤置換液５２を回収する。 In step 9, the liquid crystal dissolving solvent replacement liquid 52 recovered in step 8 is distilled to separate the mixed ferroelectric liquid crystal and the remaining water from the liquid crystal dissolving solvent replacement liquid 52. The replacement liquid 52 is collected.

工程１０では、工程９により回収した高純度の液晶溶解溶剤置換液５２を液晶溶解溶剤置換液容器５１に戻し、工程５で用いられる液晶溶解溶剤置換液５２として再利用する。使用済みの液晶溶解溶剤置換液５２を再利用することで、廃液が少なくなり、環境負荷が低減されると同時に、廃液処理に掛かるコスト、ひいては液晶表示パネルの製造コストを下げることができる。 In step 10, the high-purity liquid crystal dissolving solvent replacement liquid 52 recovered in step 9 is returned to the liquid crystal dissolving solvent replacement liquid container 51 and reused as the liquid crystal dissolving solvent replacement liquid 52 used in step 5. By reusing the used liquid crystal dissolving solvent replacement liquid 52, the amount of waste liquid is reduced, the environmental load is reduced, and at the same time, the cost for waste liquid treatment, and hence the manufacturing cost of the liquid crystal display panel can be reduced.

以上説明した本発明の実施例では、液晶溶解溶剤４２としてイソプロピルアルコールを使用し、液層溶解溶剤置換液５２として代替フロンであるバートレルを使用しているが、使用する溶媒はこれらに限定されるものではなく、少なくとも、液晶溶解溶剤４２としては、液晶を溶解する性質のあるもの、液層溶解溶剤置換液５２としては、液晶溶解溶剤４２を溶解し（液晶溶解溶剤４２と相溶性があり）、且つ、液晶溶解溶剤４２よりも液晶の溶解性が低いものであれば、本発明の趣旨を逸脱し内範囲でその他のものを用いることが可能である。特に、液層溶解溶剤置換液５２としては、液晶の溶解性が全く無いものが好ましく、少なからず液晶の溶解性がある場合には、液晶溶解溶剤４２よりも沸点が低い（揮発性が高い）ものが好ましい。 In the embodiment of the present invention described above, isopropyl alcohol is used as the liquid crystal dissolving solvent 42 and Vertrel, which is an alternative chlorofluorocarbon, is used as the liquid layer dissolving solvent replacement liquid 52, but the solvent to be used is limited to these. However, at least the liquid crystal dissolving solvent 42 has a property of dissolving liquid crystal, and the liquid layer dissolving solvent replacement liquid 52 dissolves the liquid crystal dissolving solvent 42 (compatible with the liquid crystal dissolving solvent 42). In addition, as long as the solubility of the liquid crystal is lower than that of the liquid crystal dissolution solvent 42, it is possible to use other materials within the range without departing from the gist of the present invention. In particular, the liquid layer dissolving solvent replacement liquid 52 preferably has no liquid crystal solubility, and has a lower boiling point (higher volatility) than the liquid crystal dissolving solvent 42 when there is not a little liquid crystal solubility. Those are preferred.

尚、本発明は、強誘電性液晶を用いた液晶表示素子に限らず、強誘電性液晶以外の液晶を用いた液晶表示素子にも適用することが可能である。 The present invention is not limited to a liquid crystal display element using a ferroelectric liquid crystal, but can be applied to a liquid crystal display element using a liquid crystal other than the ferroelectric liquid crystal.

１第１の基板
２画素電極（第１の電極）
６第２の基板
７対向電極（第２の電極）
１１シール材
１２注入口内液晶
１３強誘電性液晶
１４注入口
１５封口材
１６上下導通部材
１７強誘電性液晶配向不良領域
１８液晶残渣部
２１外部回路基板
２２両面接着テープ
２３コネクタ
２５導通ワイヤ
２６ワイヤ保護樹脂
３１表示領域
３５ギャップ液晶残り
３６第２基板上液晶残り
３９液晶除去空間部
４０密閉不良部
４１液晶溶解溶剤容器
４２液晶溶解溶剤
４５液晶表示パネル浸漬用カセット
４６液晶表示パネルカセット
４７パネル保持パイプ
４８ガス噴射ノズル
４９液晶溶解溶剤除去ガス
５１液晶溶解溶剤置換液容器
５２液晶溶解溶剤置換液
５３液晶溶解溶剤置換液蒸発防止冷却部
５４液晶溶解溶剤置換液蒸発防止蓋
５７超音波洗浄装置 DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 Pixel electrode (1st electrode)
6 Second substrate 7 Counter electrode (second electrode)
DESCRIPTION OF SYMBOLS 11 Sealant 12 Liquid crystal in inlet 13 Ferroelectric liquid crystal 14 Inlet 15 Sealing material 16 Vertical conduction member 17 Ferroelectric liquid crystal misalignment area 18 Liquid crystal residue part 21 External circuit board 22 Double-sided adhesive tape 23 Connector 25 Conductive wire 26 Wire protection Resin 31 Display area 35 Gap liquid crystal remaining 36 Liquid crystal remaining on second substrate 39 Liquid crystal removal space portion 40 Sealing defective portion 41 Liquid crystal dissolving solvent container 42 Liquid crystal dissolving solvent 45 Liquid crystal display panel immersion cassette 46 Liquid crystal display panel cassette 47 Panel holding pipe 48 Gas injection nozzle 49 Liquid crystal dissolved solvent removal gas 51 Liquid crystal dissolved solvent replacement liquid container 52 Liquid crystal dissolved solvent replacement liquid 53 Liquid crystal dissolved solvent replacement liquid evaporation prevention cooling part 54 Liquid crystal dissolved solvent replacement liquid evaporation prevention cover 57 Ultrasonic cleaning device

Claims

A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material,
Between the step of removing the liquid crystal around the inlet with a liquid crystal dissolving solvent and the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent attached to the periphery of the inlet is the liquid crystal dissolving solvent. And the step of substituting with a liquid crystal dissolving solvent replacement solution in which the solubility of the liquid crystal is lower than that of the liquid crystal dissolving solvent,
Between the step of removing the liquid crystal around the inlet with the liquid crystal dissolving solvent and the step of replacing the liquid crystal dissolving solvent attached around the inlet with the liquid crystal dissolving solvent replacement liquid, method of manufacturing a liquid crystal display device you further comprising a step of removing by blowing a gas to the liquid crystal dissolution solvent adhered.

Temperature of the gas, a method of manufacturing a liquid crystal display device according to claim 1, wherein at most a temperature of the liquid crystal dissolving solvent substitution fluid.

A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material,
Between the step of removing the liquid crystal around the inlet with a liquid crystal dissolving solvent and the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent attached to the periphery of the inlet is the liquid crystal dissolving solvent. And the step of substituting with a liquid crystal dissolving solvent replacement solution in which the solubility of the liquid crystal is lower than that of the liquid crystal dissolving solvent,
The liquid crystal adhering to the periphery of the inlet between the step of replacing the liquid crystal dissolving solvent adhering to the periphery of the inlet with the liquid crystal dissolving solvent replacement liquid and the step of sealing the inlet with the sealing material. method of manufacturing a liquid crystal display device you further comprising a step of dissolving a solvent substitution was dried at a reduced pressure atmosphere.

A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material,
Between the step of removing the liquid crystal around the inlet with a liquid crystal dissolving solvent and the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent attached to the periphery of the inlet is the liquid crystal dissolving solvent. And the step of substituting with a liquid crystal dissolving solvent replacement solution in which the solubility of the liquid crystal is lower than that of the liquid crystal dissolving solvent,
From the used liquid crystal dissolving solvent replacement liquid used in the step of replacing the liquid crystal dissolving solvent adhering to the periphery of the inlet with the liquid crystal dissolving solvent replacement liquid, the liquid crystal dissolving solvent and the liquid crystal mixed there And removing the liquid crystal dissolving solvent and the liquid crystal to obtain a liquid crystal dissolving solvent replacement liquid in which the liquid crystal dissolving solvent replacement liquid is attached to the periphery of the injection port. method of manufacturing a liquid crystal display device you characterized by the use in the process of replacing the replacement liquid.

The step of removing the liquid crystal dissolving solvent and the liquid crystal mixed therein from the used liquid crystal dissolving solvent replacement liquid,
The liquid crystal dissolving solvent can be dissolved from the used liquid crystal dissolving solvent replacement liquid by mixing a solvent that dissolves the liquid crystal dissolving solvent and does not dissolve the liquid crystal dissolving solvent replacement liquid into the used liquid crystal dissolving solvent replacement liquid. A process of obtaining a separated treatment liquid;
Recovering the liquid crystal dissolving solvent replacement liquid from the treatment liquid;
The method for producing a liquid crystal display element according to claim 4 , further comprising a step of increasing the purity of the liquid crystal dissolving solvent replacement liquid by distilling the recovered liquid crystal dissolving solvent replacement liquid.

A first substrate and a second substrate are bonded to each other with a sealing material through a predetermined gap, and liquid crystal is supplied between the first substrate and the second substrate from an injection port provided in the sealing material. Injecting and removing the liquid crystal around the injection port with a liquid crystal dissolving solvent, and then sealing the injection port with a sealing material,
Between the step of removing the liquid crystal around the inlet with a liquid crystal dissolving solvent and the step of sealing the inlet with a sealing material, the liquid crystal dissolving solvent attached to the periphery of the inlet is the liquid crystal dissolving solvent. And the step of substituting with a liquid crystal dissolving solvent replacement solution in which the solubility of the liquid crystal is lower than that of the liquid crystal dissolving solvent,
The liquid crystal dissolution solvent consists isopropyl alcohol, said liquid crystal dissolution solvent substitution liquid, method for producing be that the liquid crystal display device characterized in that it consists of CFC substitutes.