JPH10115831A - Manufacture of liquid crystal display device - Google Patents
Manufacture of liquid crystal display deviceInfo
- Publication number
- JPH10115831A JPH10115831A JP26963196A JP26963196A JPH10115831A JP H10115831 A JPH10115831 A JP H10115831A JP 26963196 A JP26963196 A JP 26963196A JP 26963196 A JP26963196 A JP 26963196A JP H10115831 A JPH10115831 A JP H10115831A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- dish
- cell
- injection
- ultrasonic
- 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.)
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- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は液晶表示装置の製造
方法に関する。The present invention relates to a method for manufacturing a liquid crystal display device.
【０００２】[0002]
【従来の技術】液晶表示装置は、二枚の電極付きガラス
基板の間隙に液晶層を設け、電気光学効果により、文
字，数字，図，絵などを表示する装置として、既に知ら
れている。このような液晶表示装置の液晶注入方法には
下記に示すいくつかの方法が知られている。2. Description of the Related Art A liquid crystal display device is already known as a device in which a liquid crystal layer is provided in a gap between two glass substrates with electrodes and characters, numerals, figures, pictures, etc. are displayed by an electro-optic effect. Several methods described below are known as a liquid crystal injection method for such a liquid crystal display device.
【０００３】（１）一方のガラス基板上に液晶を滴下
し、その上にポリエチレンビーズ，シリカビーズ等の電
気絶縁性のスペーサを介して、もう一枚のガラス基板を
重ね合わせる方法（特開平4−285910 号公報）。(1) A method in which liquid crystal is dropped on one glass substrate, and another glass substrate is superposed on the glass substrate via an electrically insulating spacer such as polyethylene beads or silica beads (Japanese Unexamined Patent Publication No. -285910).
【０００４】（２）予め、二枚のガラス基板に間隙を設
けた液晶セルに注入口の外に注入口と反対の位置に通じ
る穴を設け、注入口に液晶を滴下して毛細管現象を利用
する方法。(2) In a liquid crystal cell in which a gap is previously provided between two glass substrates, a hole is provided outside the injection port, which leads to a position opposite to the injection port, and liquid crystal is dropped into the injection port to utilize the capillary phenomenon. how to.
【０００５】（３）（２）と同様な液晶セル構成を成
し、注入口を液晶に浸し、一方の口から真空引きして液
晶を吸い上げる方法（特開平7−281200 号公報）。(3) A method of forming a liquid crystal cell similar to that of (2), immersing the injection port in the liquid crystal, and evacuating the liquid crystal from one of the ports to suck up the liquid crystal (JP-A-7-281200).
【０００６】（４）注入口を設けた液晶セルと液晶を入
れた液晶皿を真空可能な容器に入れ、この容器を真空に
した後注入口を液晶に浸し、排気系の容器を大気圧に戻
す過程で圧力差を利用する方法（特公昭58−49853 号公
報）。(4) A liquid crystal cell provided with an inlet and a liquid crystal dish containing liquid crystal are placed in a container capable of being evacuated, the container is evacuated, and then the inlet is immersed in the liquid crystal. A method using a pressure difference in the process of returning (Japanese Patent Publication No. 58-49853).
【０００７】（５）（４）の方法に真空容器及び液晶セ
ルを加熱する方法（特開平5−289037号公報）。(5) A method of heating a vacuum vessel and a liquid crystal cell according to the method of (4) (JP-A-5-289037).
【０００８】[0008]
【発明が解決しようとする課題】上記のような従来の液
晶表示装置の液晶注入方法には、次のような欠点があ
る。The above-described conventional liquid crystal injection method for a liquid crystal display device has the following disadvantages.
【０００９】すなわち、（１）の方法では液晶の量の加
減が難しく気泡が残りやすい。また液晶を外部に漏らさ
ないためのシール剤が液晶を汚染する等の問題が多い。
毛細管現象を利用する（２）の方法は画面サイズが大き
くなると、液晶セル内に満遍なく液晶が行き渡ることが
なく気泡を生じやすい。（３）の方法は液晶セルに均一
に液晶をいれることに適し、しかも注入時間の短縮化に
は有効な手段であるが、溶存空気を排除することがない
ので、数日後に気泡が発生する心配がある。また真空に
する際に二枚の基板の間隙を均一に保つスペーサが移動
し、間隙の不均一やスペーサの移動跡が生じ、表示品質
を著しく悪くする。（４）の方法は液晶を液晶セル内に
均一にいれるのに適し、かつ液晶中の溶存空気も除か
れ、気泡の心配もないので一般に用いられている。しか
し、注入時間が長いため大型サイズの液晶セルになると
量産性に欠ける。（５）の方法は、量産時において液晶
セル自身に温度差が生じ、注入時間がそれぞれ異なる。
また、これを回避するには一つの液晶セルに加熱機構を
備えなければならないので、排気系容器及び液晶セルの
加熱は量産性には向かない。That is, in the method (1), it is difficult to adjust the amount of liquid crystal, and air bubbles tend to remain. In addition, there are many problems that a sealant for preventing the liquid crystal from leaking outside contaminates the liquid crystal.
In the method (2) using the capillary phenomenon, when the screen size is large, the liquid crystal does not spread evenly in the liquid crystal cell, and bubbles are easily generated. The method (3) is suitable for uniformly filling the liquid crystal in the liquid crystal cell, and is an effective means for shortening the injection time. However, since dissolved air is not excluded, bubbles are generated after several days. I am worried. In addition, when vacuum is applied, the spacer that keeps the gap between the two substrates uniform moves, causing unevenness of the gap and traces of the spacer movement, which significantly deteriorates the display quality. The method (4) is generally used because it is suitable for uniformly injecting the liquid crystal into the liquid crystal cell, and the dissolved air in the liquid crystal is removed and there is no fear of bubbles. However, since the injection time is long, large-sized liquid crystal cells lack mass productivity. In the method (5), the liquid crystal cell itself has a temperature difference during mass production, and the injection time differs.
In order to avoid this, one liquid crystal cell must be provided with a heating mechanism, so that heating of the exhaust system container and the liquid crystal cell is not suitable for mass production.
【００１０】また、（４）と（５）の方法では、真空容
器内を排気する際に液晶皿に入れられた液晶から発泡が
生じ、さらには突沸して真空容器内や液晶セルを汚染
し、その結果液晶の使用量が増えたり、真空容器等の洗
浄に時間がかかるといった欠点がある。Further, in the methods (4) and (5), when the inside of the vacuum container is evacuated, foaming is generated from the liquid crystal put in the liquid crystal dish, and furthermore, bumping occurs to contaminate the inside of the vacuum container and the liquid crystal cell. As a result, there are drawbacks such as an increase in the amount of liquid crystal used and an increase in the time required to clean the vacuum container and the like.
【００１１】[0011]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明の請求項１は、少なくとも一個の注入口を
設けた液晶セルと液晶が入れられた液晶皿とを真空可能
な容器に入れ、真空容器内の空気を排気した後で、上記
液晶セルの注入口を液晶皿内の液晶中に浸たし後、上記
真空容器内を大気圧に戻して上記液晶セルの間隙内に液
晶を注入する液晶表示装置において、上記液晶皿に超音
波振動子を取り付け、上記超音波振動子から液晶へ超音
波を照射することを特徴とする。請求項２は超音波照射
によって液晶皿中の液晶を加熱しながら液晶を注入する
時に、超音波の定在波が生じるように液晶皿と空セルに
挟まれた液晶の厚み、及び液晶と超音波振動子に挟まれ
た液晶皿の厚み、超音波素振動子の周波数を選ぶことを
特徴とする。According to a first aspect of the present invention, there is provided a container capable of evacuating a liquid crystal cell having at least one injection port and a liquid crystal dish containing liquid crystal. After the air in the vacuum container is evacuated, the inlet of the liquid crystal cell is immersed in the liquid crystal in the liquid crystal dish. In a liquid crystal display device for injecting liquid crystal, an ultrasonic vibrator is attached to the liquid crystal dish, and ultrasonic waves are emitted from the ultrasonic vibrator to the liquid crystal. The thickness of the liquid crystal sandwiched between the liquid crystal dish and the empty cell so that a standing wave of the ultrasonic wave is generated when the liquid crystal is injected while heating the liquid crystal in the liquid crystal dish by ultrasonic irradiation, The thickness of the liquid crystal dish sandwiched between the ultrasonic transducers and the frequency of the ultrasonic element transducer are selected.
【００１２】請求項１では、上記真空容器内の空気の排
気時に超音波を照射することにより、液晶からの脱気が
スムースに行われ、排気時間を短くすることができるよ
うになる。また、真空容器内の汚染も防止できる。超音
波を照射する時間については特に限定されないが、発泡
が終了した時点で超音波の照射を停止することが好まし
い。これは真空条件下での液晶の蒸発が軽減されるため
である。また、連続的に超音波を照射せずに、間欠的に
照射することも液晶の蒸発軽減に有効である。他方、真
空容器内を大気に戻して液晶セル内に液晶を注入する時
に超音波を照射することにより、液晶が選択的に加熱さ
れて粘度が下がるので、短時間に液晶セル内に液晶を注
入できる。これは液晶の超音波吸収係数が液晶皿より大
きいためである。また、液晶セルではなく液晶自身を加
熱できるため、液晶セル間の温度のばらつきもなく、設
備も簡単で、量産性に寄与することができる。本発明に
よって、液晶セルへ液晶を注入する時間が短縮される
が、液晶セル内のラビング角度と注入方向を一致させる
ことで、より注入時間を短縮できる。尚、ここでいうラ
ビング角度とは、図２に示されているように２枚の基板
の各々のラビング角度θ１，θ２を注入口のある辺から
反時計回りに計った角度の平均値である。例えば、上の
基板のラビング角度θ１が３０度、下の基板のラビング
角度θ２が９０度であるとき、ラビング角度は６０度と
なる。また、上の基板のラビング角度θ１が３０度、下
の基板の配向処理角度θ２が３０度であるとき、ラビン
グ角度は３０度となる。このラビング角度の最小値は０
度であり、最大値は９０度である。ラビング角度が４５
度以上であるとき、液晶の注入方向と一致する方向に近
づくことを意味する。そして、ラビング角度が９０度で
あるとき、液晶の注入方向と一致する。また、注入口の
幅や、位置，数を増やすことも注入時間の短縮化に有効
である。液晶セル内に液晶を注入する時の超音波照射の
時間についても特に限定されないが、真空容器内を大気
に戻した時点で超音波を照射することが好ましい。これ
も真空条件下での液晶の蒸発が軽減されるためである。
超音波の照射によって加熱される液晶の温度に関しては
特に限定されないが、液晶が等方性液体になる温度（Ｎ
−Ｉ点）以下に設定することが好ましい。これは、液晶
の粘度が、Ｎ−Ｉ点以上になると飽和するからである。
また、過熱による液晶の劣化を防止できる利点がある。
液晶の温度設定に関しては、温度調整器を用いて制御す
ることが好ましい。請求項２では、液晶皿と液晶セルに
挟まれた液晶の厚み、及び液晶と超音波振動子に挟まれ
た液晶皿の厚み、超音波振動子の周波数を選ぶことによ
り超音波の定在波が生じさせ、効率よく加熱することが
でき、短時間に液晶を加熱することができる。また、気
泡の発生を防止する効果も期待できる。液晶皿の種類に
ついては特に限定されないが、液晶皿の材質にあわせて
超音波の定在波が生じるように、その厚さを調整するこ
とが重要である。超音波振動子の周波数，液晶の厚み，
液晶皿の厚みの選択にあたっては数１を参考にした。数
１で、超音波振動子の周波数をＦ（Ｈｚ）、液晶や液晶
皿の厚さをＬ（mm）、液晶や液晶皿の材質の音速度をＶ
(ｍ／sec）とした。According to the first aspect, by irradiating ultrasonic waves during the evacuation of the air in the vacuum vessel, degassing from the liquid crystal is performed smoothly, and the evacuation time can be shortened. Further, contamination in the vacuum vessel can be prevented. The time for irradiating the ultrasonic wave is not particularly limited, but it is preferable to stop the irradiation of the ultrasonic wave when the foaming is completed. This is because evaporation of liquid crystal under vacuum conditions is reduced. In addition, intermittent irradiation without continuous ultrasonic irradiation is also effective in reducing evaporation of liquid crystal. On the other hand, the liquid crystal is selectively heated and its viscosity is lowered by irradiating ultrasonic waves when the liquid is injected into the liquid crystal cell by returning the inside of the vacuum container to the atmosphere, so that the liquid crystal is injected into the liquid crystal cell in a short time. it can. This is because the ultrasonic absorption coefficient of the liquid crystal is larger than that of the liquid crystal dish. Further, since the liquid crystal itself can be heated instead of the liquid crystal cell, there is no variation in temperature between the liquid crystal cells, the equipment is simple, and it can contribute to mass productivity. According to the present invention, the time for injecting the liquid crystal into the liquid crystal cell is shortened, but the injection time can be further shortened by matching the rubbing angle in the liquid crystal cell with the injection direction. The rubbing angle referred to here is an average value of angles obtained by measuring the rubbing angles θ1 and θ2 of the two substrates in a counterclockwise direction from the side of the injection port as shown in FIG. . For example, when the rubbing angle θ1 of the upper substrate is 30 degrees and the rubbing angle θ2 of the lower substrate is 90 degrees, the rubbing angle is 60 degrees. When the rubbing angle θ1 of the upper substrate is 30 degrees and the orientation processing angle θ2 of the lower substrate is 30 degrees, the rubbing angle is 30 degrees. The minimum value of this rubbing angle is 0
Degrees, and the maximum value is 90 degrees. Rubbing angle is 45
When it is higher than or equal to the degree, it means approaching the direction coinciding with the liquid crystal injection direction. When the rubbing angle is 90 degrees, the rubbing angle coincides with the liquid crystal injection direction. Increasing the width, position, and number of injection ports is also effective in shortening the injection time. The time for irradiating the ultrasonic wave when injecting the liquid crystal into the liquid crystal cell is not particularly limited, but it is preferable to irradiate the ultrasonic wave when the inside of the vacuum container is returned to the atmosphere. This is also because the evaporation of the liquid crystal under vacuum conditions is reduced.
The temperature of the liquid crystal heated by the irradiation of the ultrasonic wave is not particularly limited, but the temperature at which the liquid crystal becomes an isotropic liquid (N
-I point) It is preferable to set the following. This is because when the viscosity of the liquid crystal becomes higher than the NI point, the liquid crystal is saturated.
Further, there is an advantage that deterioration of the liquid crystal due to overheating can be prevented.
It is preferable to control the temperature of the liquid crystal by using a temperature controller. In Claim 2, the thickness of the liquid crystal sandwiched between the liquid crystal dish and the liquid crystal cell, the thickness of the liquid crystal dish sandwiched between the liquid crystal and the ultrasonic vibrator, and the frequency of the ultrasonic vibrator are selected to select the standing wave of the ultrasonic wave. And heating can be performed efficiently, and the liquid crystal can be heated in a short time. Further, an effect of preventing the generation of bubbles can be expected. The type of the liquid crystal dish is not particularly limited, but it is important to adjust the thickness of the liquid crystal dish so that a standing wave of ultrasonic waves is generated according to the material of the liquid crystal dish. The frequency of the ultrasonic transducer, the thickness of the liquid crystal,
Equation 1 was referred to when selecting the thickness of the liquid crystal dish. In Equation 1, the frequency of the ultrasonic vibrator is F (Hz), the thickness of the liquid crystal or the liquid crystal dish is L (mm), and the sound velocity of the liquid crystal or the material of the liquid crystal dish is V
(m / sec).
【００１３】[0013]
【数１】 ＦｘＬ＝Ｖ …（数１） 数１で、Ｌが超音波の波長の二分の一なるように、超音
波振動子の周波数，液晶の厚み，液晶皿の厚みを選択す
ることが最も好ましい組み合わせとなる。FxL = V (Equation 1) In Equation 1, it is possible to select the frequency of the ultrasonic vibrator, the thickness of the liquid crystal, and the thickness of the liquid crystal dish so that L is a half of the wavelength of the ultrasonic wave. This is the most preferable combination.
【００１４】[0014]
（実施例１）図１は本発明の液晶表示装置の液晶注入方
法を示したものである。すなわち、真空容器６の中に液
晶セル４が液晶注入口１２を下にしてセットされてい
る。(Embodiment 1) FIG. 1 shows a liquid crystal injection method for a liquid crystal display device according to the present invention. That is, the liquid crystal cell 4 is set in the vacuum container 6 with the liquid crystal injection port 12 facing down.
【００１５】液晶セルのサイズは２７０mm（長片側）×
２００mm（短片側）で表示部は対角で１０.４インチサ
イズであり、厚みが１.１mmで表面を研磨した透明なガ
ラス基板を用いた。これら基板の上に共通電極，信号電
極，画素電極などを形成し、更にその最表面にの配向膜
を形成した。本実施例では配向膜としてポリイミドを採
用し、印刷機で塗布し焼成(２５０℃／３０分)後の膜厚
を０.０７〜０.１μｍ程度とした。その後、配向膜の表
面を液晶を配向させるための配向処理を施した。配向処
理はラビング機（ＦＳ−５５Ｒ型 フジオカ製）を使用
し、ラビングロール（直径７５×長さ６００mm）にレー
ヨン製、バフ布を用い、条件は回転数1300rpm ，送り速
度３３mm／sec ，切り込み量０.４mm で行った。上下基
板の接着は接着剤（エポキシ系樹脂ストラクトボンド
三井東圧製）の中にポリマビーズ（積水化学製）を適量
混入し、シールマスクを用いて基板上に印刷した。その
後、接着剤の仮硬化（８０℃／３０分）を行い、上下基
板を組み合わせた。そして、プレスを用いて２枚の基板
を加圧しつつ、接着剤を硬化（１５０℃／９０分）し
た。パネル面内には球形のポリマービーズを基板間に狭
持し、液晶封入状態でギャップを６.０μｍ とした。接
着剤は基板周辺に設けられ、その一部を液晶が注入され
るよう開放してある。この液晶セルのラビング角度は３
０度である。注入口の幅は２０mmである。液晶皿１はア
ルミ製であり、表面がテフロンでコーティングされてい
る。液晶２はテフロンの表面張力で液晶皿１の面よりも
高く盛り上がった状態で備えられている。液晶２は液晶
セル４に必要な注入量に十分な量である。液晶皿１の下
の超音波振動子３がリード線を介して１３アンプ７、フ
ァクションジェネレター８連結され、また、熱電対１２
が温度コントローラ９に連結され、液晶２の温度を任意
に制御できるようになっている。The size of the liquid crystal cell is 270 mm (one long side) ×
A transparent glass substrate having a size of 200 mm (short side), a display part having a diagonal size of 10.4 inches, a thickness of 1.1 mm and a polished surface was used. A common electrode, a signal electrode, a pixel electrode and the like were formed on these substrates, and an alignment film was formed on the outermost surface. In this embodiment, polyimide was adopted as the alignment film, and the thickness after coating with a printing machine and firing (250 ° C./30 minutes) was about 0.07 to 0.1 μm. After that, an alignment process was performed on the surface of the alignment film to align the liquid crystal. The rubbing machine (FS-55R type made by Fujioka) is used for the orientation treatment, and the rubbing roll (diameter 75 x length 600 mm) is made of rayon and buff cloth. It was performed at 0.4 mm. The upper and lower substrates are bonded using an adhesive (epoxy resin struct bond)
An appropriate amount of polymer beads (manufactured by Mitsui Toatsu) was mixed into Sekisui Chemical Co., Ltd., and printed on a substrate using a seal mask. Thereafter, the adhesive was temporarily cured (80 ° C./30 minutes), and the upper and lower substrates were combined. Then, while pressing the two substrates using a press, the adhesive was cured (150 ° C./90 minutes). Spherical polymer beads were sandwiched between the substrates in the panel surface, and the gap was set to 6.0 μm with the liquid crystal sealed. The adhesive is provided around the substrate, and a part of the adhesive is opened so that liquid crystal is injected. The rubbing angle of this liquid crystal cell is 3
0 degrees. The width of the inlet is 20 mm. The liquid crystal dish 1 is made of aluminum, and its surface is coated with Teflon. The liquid crystal 2 is provided in a raised state higher than the surface of the liquid crystal dish 1 due to the surface tension of Teflon. The amount of the liquid crystal 2 is sufficient for the necessary amount of liquid crystal to be injected into the liquid crystal cell 4. The ultrasonic vibrator 3 under the liquid crystal dish 1 is connected to a 13 amplifier 7 and a function generator 8 via lead wires, and a thermocouple 12
Is connected to the temperature controller 9 so that the temperature of the liquid crystal 2 can be arbitrarily controlled.
【００１６】図３（ａ），（ｂ）は本発明の超音波振動
子付の液晶皿１を示す。液晶皿１に蓄えられた液晶２の
端部に熱電対１２の差し込む穴があり、液晶２の温度を
検知するようになっている。また、超音波を発信させる
ためのリード線が超音波振動子に連結されている。図４
に液晶皿と液晶セルに挟まれた液晶の厚みＬ1 （液晶皿
の深さ）、及び液晶と超音波振動子に挟まれた液晶皿の
厚みＬ2 の定義を示してある。本実施例では、液晶中や
液晶皿中に超音波の定在波が生じるように、超音波振動
子の周波数５００ｋＨｚに合わせて、液晶の厚み，液晶
皿の厚みはそれぞれ１.５mm ，６mmにした。なお、液
晶，アルミ製液晶皿の音速はそれぞれ約１５００ｍ／se
c ，約６０００ｍ／sec である。また、液晶皿１は昇降
機５に連結され、昇降機５によって矢印のように上下で
きるようになっている。なお、真空容器６内は圧力調整
弁１０及びロータリーポンプによって排気及び吸気がで
きるようになっている。さらに、圧力容器６の壁にある
内部を観察できる覗き窓が装備されており、液晶皿中の
液晶の脱気状態や液晶セルへの液晶の注入状態を観察す
ることができる。FIGS. 3A and 3B show a liquid crystal dish 1 with an ultrasonic vibrator according to the present invention. A hole for inserting a thermocouple 12 is provided at an end of the liquid crystal 2 stored in the liquid crystal dish 1 so as to detect the temperature of the liquid crystal 2. A lead wire for transmitting an ultrasonic wave is connected to the ultrasonic transducer. FIG.
2 shows the definition of the thickness L 1 (depth of the liquid crystal dish) of the liquid crystal sandwiched between the liquid crystal dish and the liquid crystal cell, and the thickness L 2 of the liquid crystal dish sandwiched between the liquid crystal and the ultrasonic vibrator. In this embodiment, the thickness of the liquid crystal and the thickness of the liquid crystal dish are set to 1.5 mm and 6 mm, respectively, in accordance with the frequency of the ultrasonic vibrator 500 kHz so that standing waves of ultrasonic waves are generated in the liquid crystal and the liquid crystal dish. did. The sound velocity of the liquid crystal and the aluminum liquid crystal dish is about 1500 m / se, respectively.
c, about 6000 m / sec. The liquid crystal dish 1 is connected to an elevator 5 so that the liquid crystal tray 1 can be moved up and down as indicated by an arrow. The inside of the vacuum vessel 6 can be evacuated and suctioned by a pressure regulating valve 10 and a rotary pump. Further, a viewing window for observing the inside of the wall of the pressure vessel 6 is provided, so that the state of degassing of liquid crystal in the liquid crystal dish and the state of injection of liquid crystal into the liquid crystal cell can be observed.
【００１７】以上液晶表示装置の個々のものについて説
明したが、次に液晶注入方法について詳細に述べる。超
音波(周波数５００ｋＨｚ正弦波，入力電圧Ｖｐｐ＝５
０Ｖ)を照射しながら、真空容器６内をロータリーポン
プ１１及び圧力調整弁１０で排気し、発泡が止まった時
点で超音波照射を停止し、さらに排気を続けて真空度５
×１０Ｐａした後、昇降機５によって液晶皿１を１０.
４ インチサイズの液晶セル４に浸す。１〜２分後にロ
ータリーポンプ１１を止め、真空容器６内を圧力調整弁
１０で徐々に大気に戻す。大気圧に戻す時点で、超音波
(周波数５００ｋＨｚ正弦波，入力電圧Ｖｐｐ＝１００
Ｖ）を照射し、温度コントローラ９でＺＬＩ−１１３２
液晶｛Ｎ−Ｉ点（液晶が等方性液体になる温度）７１
℃｝２の温度を４０℃にした。１０．４ インチ全面に
注入完了した後、昇降機５によって液晶皿１を下げ、液
晶２を液晶セル４から離す。既に液晶注入完了以前に真
空容器６内は大気圧に戻っているので、直ちに真空容器
６から液晶セル４を取り出し、液晶セル面内のギャップ
をより均一にするためパネル面を加圧し、同時に注入口
を光硬化剤（アクリル性樹脂ロックタイト社製）で封止
した。The individual liquid crystal display devices have been described above. Next, a liquid crystal injection method will be described in detail. Ultrasound (500 kHz sine wave, input voltage Vpp = 5
0V), the inside of the vacuum container 6 is evacuated by the rotary pump 11 and the pressure regulating valve 10, and when the bubbling stops, the ultrasonic irradiation is stopped.
After the pressure of 10 Pa, the liquid crystal dish 1 was moved to 10.
Immerse it in a 4 inch liquid crystal cell 4. After 1-2 minutes, the rotary pump 11 is stopped, and the inside of the vacuum vessel 6 is gradually returned to the atmosphere by the pressure regulating valve 10. When returning to atmospheric pressure, ultrasonic
(500 kHz sine wave, input voltage Vpp = 100
V), and ZLI-1132
Liquid crystal ｛NI point (temperature at which liquid crystal becomes isotropic liquid) 71
The temperature of ° C｝ 2 was raised to 40 ° C. After filling the entire 10.4 inch, the liquid crystal dish 1 is lowered by the elevator 5 and the liquid crystal 2 is separated from the liquid crystal cell 4. Since the inside of the vacuum container 6 has already returned to the atmospheric pressure before the liquid crystal injection is completed, the liquid crystal cell 4 is immediately taken out of the vacuum container 6, and the panel surface is pressurized to make the gap in the liquid crystal cell surface more uniform. The entrance was sealed with a photocuring agent (acrylic resin Loctite).
【００１８】本実施例で、排気にかかる時間が６０分で
あり、液晶が４０℃に加熱されるまでの時間は１分であ
った。液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの時間（注入時間）が６６分で
あった。また、排気時における液晶の突沸もないので、
真空容器の洗浄の回数を低減させることができた。な
お、分析結果より、液晶組成物に変化はなかった。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 1 minute. The time (injection time) from the immersion of the liquid crystal into the liquid crystal cell until the injection was completed and the liquid crystal was separated from the liquid crystal cell (injection time) was 66 minutes. Also, since there is no bumping of the liquid crystal during exhaust,
The number of times of cleaning the vacuum vessel could be reduced. Note that there was no change in the liquid crystal composition from the analysis results.
【００１９】（実施例２）実施例１で、超音波振動子の
周波数を４００ｋＨｚに変更した以外、全く同様にして
液晶表示装置の製造を行った。Example 2 A liquid crystal display device was manufactured in the same manner as in Example 1, except that the frequency of the ultrasonic vibrator was changed to 400 kHz.
【００２０】本実施例で、排気にかかる時間が６０分
で、液晶が４０℃に加熱されるまでの時間は１０分であ
った。注入時間は７０分であった。排気時における液晶
の突沸もないので、真空容器の洗浄の回数を低減させる
ことができた。なお、分析結果より、液晶組成物に変化
はなかった。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 10 minutes. The injection time was 70 minutes. Since there was no bumping of the liquid crystal at the time of evacuation, the number of times of cleaning the vacuum vessel could be reduced. Note that there was no change in the liquid crystal composition from the analysis results.
【００２１】（実施例３）実施例１で、超音波の照射条
件を以下のように変更した以外、全く同様にして液晶表
示装置の製造を行った。超音波照射を真空容器内の空気
を排気時にのみに行い、真空容器内を大気に戻して上記
液晶セルに内に液晶を注入する工程で超音波の照射を行
わなかった。Example 3 A liquid crystal display device was manufactured in exactly the same manner as in Example 1, except that the ultrasonic irradiation conditions were changed as follows. Ultrasonic irradiation was performed only when the air in the vacuum container was evacuated, and the ultrasonic irradiation was not performed in the step of returning the inside of the vacuum container to the atmosphere and injecting the liquid crystal into the liquid crystal cell.
【００２２】本実施例で、排気にかかる時間が６０分で
あり、液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの注入時間が１２５分であっ
た。また、排気時における液晶の突沸もないので、真空
容器の洗浄の回数を低減させることができた。なお、分
析結果より、液晶組成物に変化はなかった。In the present embodiment, the time required for evacuation was 60 minutes, and the injection time from immersion of the liquid crystal into the liquid crystal cell to completion of injection and separation of the liquid crystal from the liquid crystal cell was 125 minutes. Further, since there was no bumping of the liquid crystal at the time of evacuation, the number of times of cleaning the vacuum vessel could be reduced. Note that there was no change in the liquid crystal composition from the analysis results.
【００２３】（実施例４）実施例１で、超音波の照射条
件を以下のように変更した以外、全く同様にして液晶表
示装置の製造を行った。超音波の照射を真空容器内の空
気を排気時には行わず、真空容器内を大気に戻して上記
液晶セル内に液晶を注入する工程で超音波の照射を行っ
た。Example 4 A liquid crystal display device was manufactured in exactly the same manner as in Example 1, except that the ultrasonic irradiation conditions were changed as follows. Ultrasonic irradiation was not performed when the air in the vacuum container was exhausted, but was irradiated in the step of returning the inside of the vacuum container to the atmosphere and injecting the liquid crystal into the liquid crystal cell.
【００２４】本実施例で、排気にかかる時間が９０分で
あり、液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの注入時間が６６分であった。
なお、分析結果より、液晶組成物に変化はなかった。In the present embodiment, the time required for the exhaust was 90 minutes, and the injection time from the completion of the injection of the liquid crystal into the liquid crystal cell to the separation of the liquid crystal from the liquid crystal cell was 66 minutes.
Note that there was no change in the liquid crystal composition from the analysis results.
【００２５】（実施例５）実施例１で、液晶皿をアルミ
製からガラス石英製に変え、液晶皿の厚みを以下のよう
に変更した以外、全く同様にして液晶表示装置の製造を
行った。石英液晶皿の音速は５５００ｍ／sec であるか
ら、超音波振動子の周波数，液晶の厚み，液晶皿の厚み
の組み合わせを、それぞれ５００ｋＨｚ，１.５mm，５.
５mmとした。Example 5 A liquid crystal display was manufactured in exactly the same manner as in Example 1, except that the liquid crystal dish was changed from aluminum to glass quartz and the thickness of the liquid crystal dish was changed as follows. . Since the sound speed of the quartz liquid crystal dish is 5500 m / sec, the combination of the frequency of the ultrasonic vibrator, the thickness of the liquid crystal, and the thickness of the liquid crystal dish is 500 kHz, 1.5 mm, and 5.5 mm, respectively.
It was 5 mm.
【００２６】本実施例で、排気にかかる時間が６０分で
あり、液晶が４０℃に加熱されるまでの時間は１分であ
った。液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの注入時間が６６分であった。
また、排気時における液晶の突沸もないので、真空容器
の洗浄の回数を低減させることができた。なお、分析結
果より、液晶組成物に変化はなかった。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 1 minute. The injection time from immersion of the liquid crystal to the liquid crystal cell to completion of the injection and separation of the liquid crystal from the liquid crystal cell was 66 minutes.
Further, since there was no bumping of the liquid crystal at the time of evacuation, the number of times of cleaning the vacuum vessel could be reduced. Note that there was no change in the liquid crystal composition from the analysis results.
【００２７】（実施例６）実施例１で、液晶セルの注入
口の位置を以下のように変更した以外、全く同様にして
液晶表示装置の製造を行った。注入口の位置を図１の短
片側ではなく、長片側の中央に設けた。Example 6 A liquid crystal display device was manufactured in exactly the same manner as in Example 1, except that the position of the injection port of the liquid crystal cell was changed as follows. The position of the inlet was provided not at the short side of FIG. 1 but at the center of the long side.
【００２８】本実施例で、排気にかかる時間が６０分で
あり、液晶が４０℃に加熱されるまでの時間は１分であ
った。液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの時間（注入時間）は５５分で
あった。これは超音波の効果に加え、ラビング角が液晶
の注入方向に近かずいたためと思われる。すなわち、短
辺側から見た場合、４５度以下であったラビング角度
が、長片側からは４５度以上になった効果である。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 1 minute. The time from injection of the liquid crystal to the liquid crystal cell to completion of the injection and separation of the liquid crystal from the liquid crystal cell (injection time) was 55 minutes. This is probably because the rubbing angle did not approach the liquid crystal injection direction in addition to the effect of the ultrasonic wave. That is, the rubbing angle is 45 degrees or less when viewed from the short side, but is 45 degrees or more from the long side.
【００２９】（実施例７）実施例１で、液晶セルのラビ
ング角を６０度に変更した以外、全く同様にして液晶表
示セルの製造を行った。Example 7 A liquid crystal display cell was manufactured in exactly the same manner as in Example 1 except that the rubbing angle of the liquid crystal cell was changed to 60 degrees.
【００３０】本実施例で、排気にかかる時間が６０分で
あり、液晶が４０℃に加熱されるまでの時間は１分であ
った。液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの時間（注入時間）が５６分で
あった。これは超音波の効果に加え、実施例６と同様に
ラビング角が液晶の注入方向に近かずいたためと思われ
る。ラビング角が液晶の注入方向に近かずいたためと思
われる。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 1 minute. The time (injection time) from the dipping of the liquid crystal into the liquid crystal cell until the injection was completed and the liquid crystal was separated from the liquid crystal cell (injection time) was 56 minutes. This is presumably because, in addition to the effect of the ultrasonic wave, the rubbing angle did not approach the liquid crystal injection direction as in the sixth embodiment. This is probably because the rubbing angle did not approach the liquid crystal injection direction.
【００３１】（実施例８）実施例７で、液晶セルの注入
口の位置を以下のように変更した以外、全く同様にして
液晶表示装置の製造を行った。注入口の位置を図１の短
片側ではなく、長片側の中央に設けた。Example 8 A liquid crystal display device was manufactured in the same manner as in Example 7, except that the position of the injection port of the liquid crystal cell was changed as follows. The position of the inlet was provided not at the short side of FIG. 1 but at the center of the long side.
【００３２】本実施例で、排気にかかる時間が６０分で
あり、液晶が４０℃に加熱されるまでの時間は１分であ
った。注入時間は６５分であった。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 1 minute. The injection time was 65 minutes.
【００３３】（実施例９）実施例１で、液晶セルの注入
口の位置を以下のように変更した以外、全く同様にして
液晶表示セルの製造を行った。注入口の位置を図２の短
片側の中央から２０mm左に設けた。Example 9 A liquid crystal display cell was manufactured in the same manner as in Example 1, except that the position of the injection port of the liquid crystal cell was changed as follows. The position of the inlet was provided 20 mm left from the center of the short side of FIG.
【００３４】本実施例で、排気にかかる時間が６０分で
あり、液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの注入時間は５５分であった。
これは超音波の効果に加え、実施例６と同様にラビング
角が液晶の注入方向に近かずいたためと思われる。In the present embodiment, the time required for evacuation was 60 minutes, and the injection time from immersion of the liquid crystal into the liquid crystal cell to completion of the injection and separation of the liquid crystal from the liquid crystal cell was 55 minutes.
This is presumably because, in addition to the effect of the ultrasonic wave, the rubbing angle did not approach the liquid crystal injection direction as in the sixth embodiment.
【００３５】（実施例１０）実施例１で、液晶セルの注
入口の数を以下のように変更した以外、全く同様にして
液晶表示装置の製造を行った。幅２０mmの注入口の数を
一つから二つから増やし、短片側の中央に２０mmの間隔
をあけて設けた。Example 10 A liquid crystal display device was manufactured in the same manner as in Example 1, except that the number of injection ports of the liquid crystal cell was changed as follows. The number of inlets having a width of 20 mm was increased from one to two, and provided at the center of the short side with a space of 20 mm.
【００３６】本実施例で、排気にかかる時間が６０分で
あり、液晶が４０℃に加熱されるまでの時間は１分であ
った。液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの注入時間は３８分であった。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 1 minute. The injection time from when the liquid crystal was immersed in the liquid crystal cell to when the injection was completed and the liquid crystal was separated from the liquid crystal cell was 38 minutes.
【００３７】（実施例１１）実施例１で、液晶セルの注
入口の位置を以下のように変更した以外、全く同様にし
て液晶表示装置の製造を行った。幅２０mmの注入口の数
を一つから二つから増やし、短片側の両端に設けた。Example 11 A liquid crystal display device was manufactured in the same manner as in Example 1, except that the position of the injection port of the liquid crystal cell was changed as follows. The number of inlets having a width of 20 mm was increased from one to two and provided at both ends on one short side.
【００３８】本実施例で、排気にかかる時間が６０分で
あり、液晶が４０℃に加熱されるまでの時間は１分であ
った。液晶を液晶セルに浸してから注入が完了して液晶
を液晶セルから離すまでの注入時間は５１分であった。In the present embodiment, the time required for exhaustion was 60 minutes, and the time required for heating the liquid crystal to 40 ° C. was 1 minute. The injection time from when the liquid crystal was immersed in the liquid crystal cell to when the injection was completed and the liquid crystal was separated from the liquid crystal cell was 51 minutes.
【００３９】（比較例１）実施例１で、真空排気時や液
晶注入時に超音波を全く照射せずに、液晶セルに液晶の
注入を行った。(Comparative Example 1) In Example 1, the liquid crystal was injected into the liquid crystal cell without irradiating the ultrasonic wave at all during the evacuation or the injection of the liquid crystal.
【００４０】排気にかかる時間が９０分であり、液晶セ
ルを液晶皿中の液晶に浸し、注入が完了して液晶を液晶
セルから離すまでの注入時間は１２０分であった。排気
時間と注入時間が実施例１よりそれぞれ１.５ 倍，２倍
を必要とした。また、液晶が突沸し真空容器内が汚染さ
れた。The time required for evacuation was 90 minutes, and the time required for the liquid crystal cell to be immersed in the liquid crystal in the liquid crystal dish and the injection was completed until the liquid crystal was separated from the liquid crystal cell was 120 minutes. The evacuation time and the injection time were required to be 1.5 times and 2 times that of Example 1, respectively. Further, the liquid crystal bumped and the inside of the vacuum vessel was contaminated.
【００４１】（比較例２）実施例６で、真空排気時や液
晶注入時に超音波を全く照射せずに、液晶セルに液晶の
注入を行った。(Comparative Example 2) In Example 6, the liquid crystal was injected into the liquid crystal cell without irradiating any ultrasonic wave at the time of evacuation or injection of the liquid crystal.
【００４２】排気にかかる時間が９０分であり、注入時
間は１１５分であった。排気時間と注入時間が実施例６
よりそれぞれ１.５ 倍，２倍を必要とした。また、液晶
が突沸し真空容器内が汚染された。The time required for evacuation was 90 minutes, and the injection time was 115 minutes. Example 6: Exhaust time and injection time
1.5 times and 2 times respectively were required. Further, the liquid crystal bumped and the inside of the vacuum vessel was contaminated.
【００４３】（比較例３）実施例１０で、真空排気時や
液晶注入時に超音波を全く照射せずに、液晶セルに液晶
の注入を行った。(Comparative Example 3) In Example 10, the liquid crystal was injected into the liquid crystal cell without irradiating the ultrasonic wave at all during the evacuation or the injection of the liquid crystal.
【００４４】本実施例で、排気にかかる時間が９０分で
あり、注入時間は８０分であった。排気時間と注入時間
が実施例１よりそれぞれ１.５ 倍，２倍を必要とした。
また、液晶が突沸し真空容器内が汚染された。In this embodiment, the time required for the exhaust was 90 minutes, and the injection time was 80 minutes. The evacuation time and the injection time were required to be 1.5 times and 2 times that of Example 1, respectively.
Further, the liquid crystal bumped and the inside of the vacuum vessel was contaminated.
【００４５】[0045]
【発明の効果】本発明の液晶表示装置の製造方法を用い
れば、液晶セル間のばらつきもなく、一様に排気時間や
注入時間を短縮でき、気泡やスペーサの移動による液晶
層の厚みむらもない画質の良い液晶セルが可能である。
また、真空排気時の超音波による脱気により、真空容器
内や液晶セルの汚染も防止できる。According to the method of manufacturing a liquid crystal display device of the present invention, the exhaust time and the injection time can be reduced uniformly without variation between liquid crystal cells, and the thickness unevenness of the liquid crystal layer due to the movement of bubbles and spacers can be reduced. A liquid crystal cell with good image quality is possible.
In addition, the inside of the vacuum container and the liquid crystal cell can be prevented from being contaminated by the degassing by the ultrasonic wave during the evacuation.
【図１】本発明に係る液晶表示装置の液晶注入方法の説
明図。FIG. 1 is an explanatory diagram of a liquid crystal injection method for a liquid crystal display device according to the present invention.
【図２】本発明に係る液晶セル及び注入方向の説明図。FIG. 2 is an explanatory view of a liquid crystal cell and an injection direction according to the present invention.
【図３】本発明に係る液晶皿の説明図。FIG. 3 is an explanatory view of a liquid crystal dish according to the present invention.
【図４】本発明に係る超音波振動子の付いた液晶皿の説
明図。FIG. 4 is an explanatory view of a liquid crystal dish provided with an ultrasonic vibrator according to the present invention.
１…液晶皿、２…液晶、３…超音波振動子、４…液晶セ
ル、５…昇降機、６…真空容器、７…アンプ、８…ファ
ンクションジェネレター、９…温度コントローラ、１０
…圧力調整弁、１１…真空ポンプ、１２…注入口、１３
…熱電対、１４…リード線。DESCRIPTION OF SYMBOLS 1 ... Liquid crystal dish, 2 ... Liquid crystal, 3 ... Ultrasonic vibrator, 4 ... Liquid crystal cell, 5 ... Elevator, 6 ... Vacuum container, 7 ... Amplifier, 8 ... Function generator, 9 ... Temperature controller, 10
... pressure regulating valve, 11 ... vacuum pump, 12 ... inlet, 13
... thermocouple, 14 ... lead wire.
フロントページの続き (72)発明者 塙 安男 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内Continued on the front page (72) Inventor Yasuo Hanawa 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd.
Claims (2)
板をスペーサ及びシール剤を介して重ね合わせ少なくと
も一個の液晶注入口を設けた液晶セルと液晶が入れられ
た液晶皿とを真空可能な容器に入れ、上記真空容器内の
空気を排気した状態で上記液晶セルの注入口を上記液晶
皿内の液晶中に浸した後、上記真空容器内を大気に戻し
て上記液晶セル内に液晶を注入する液晶表示装置の製造
方法において、上記液晶皿に超音波振動子を取り付け、
上記超音波振動子から液晶へ超音波を照射することを特
徴とする液晶表示装置の製造方法。A liquid crystal cell having at least one liquid crystal injection port and a liquid crystal dish containing liquid crystal can be evacuated by laminating a pair of glass substrates on which a liquid crystal alignment film is formed via a spacer and a sealant. After immersing the injection port of the liquid crystal cell in the liquid crystal in the liquid crystal dish while evacuating the air in the vacuum container, returning the inside of the vacuum container to the atmosphere and returning the liquid crystal in the liquid crystal cell. In the method of manufacturing a liquid crystal display device injecting, an ultrasonic vibrator is attached to the liquid crystal dish,
A method for manufacturing a liquid crystal display device, comprising irradiating a liquid crystal with ultrasonic waves from the ultrasonic transducer.
ら液晶を注入する時に、超音波が液晶皿と空セルに挟ま
れた液晶の厚み内及び液晶と超音波振動子に挟まれた液
晶皿の厚み内で定在波を生じるように、超音波振動子の
周波数，液晶の厚み，液晶皿の厚みを選ぶ請求項１に記
載の液晶表示装置の製造方法。2. When a liquid crystal is injected into a liquid crystal cell while being heated by irradiating ultrasonic waves, the ultrasonic wave is applied to the liquid crystal sandwiched between the liquid crystal dish and the empty cell and to the liquid crystal sandwiched between the liquid crystal and the ultrasonic vibrator. 2. The method according to claim 1, wherein the frequency of the ultrasonic vibrator, the thickness of the liquid crystal, and the thickness of the liquid crystal dish are selected so as to generate a standing wave within the thickness of the dish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26963196A JPH10115831A (en) | 1996-10-11 | 1996-10-11 | Manufacture of liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26963196A JPH10115831A (en) | 1996-10-11 | 1996-10-11 | Manufacture of liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10115831A true JPH10115831A (en) | 1998-05-06 |
Family
ID=17475048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26963196A Pending JPH10115831A (en) | 1996-10-11 | 1996-10-11 | Manufacture of liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10115831A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002122875A (en) * | 2000-10-04 | 2002-04-26 | Samsung Electronics Co Ltd | Device for injecting liquid crystal and method of manufacturing liquid crystal panel using the same |
| KR100479841B1 (en) * | 2001-06-25 | 2005-03-30 | 가부시키가이샤 시마즈세이사쿠쇼 | Liquid crystal applicator and liquid crystal application method, and apparatus for manufacturing liquid crystal panel |
| JP2005275043A (en) * | 2004-03-25 | 2005-10-06 | Casio Comput Co Ltd | Liquid crystal injecting method and apparatus therefor |
-
1996
- 1996-10-11 JP JP26963196A patent/JPH10115831A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002122875A (en) * | 2000-10-04 | 2002-04-26 | Samsung Electronics Co Ltd | Device for injecting liquid crystal and method of manufacturing liquid crystal panel using the same |
| KR100479841B1 (en) * | 2001-06-25 | 2005-03-30 | 가부시키가이샤 시마즈세이사쿠쇼 | Liquid crystal applicator and liquid crystal application method, and apparatus for manufacturing liquid crystal panel |
| JP2005275043A (en) * | 2004-03-25 | 2005-10-06 | Casio Comput Co Ltd | Liquid crystal injecting method and apparatus therefor |
| JP4665416B2 (en) * | 2004-03-25 | 2011-04-06 | カシオ計算機株式会社 | Liquid crystal injection method and apparatus. |
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