JPH095762A - Production of liquid crystal panel - Google Patents

Production of liquid crystal panel

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Publication number
JPH095762A
JPH095762A JP15366495A JP15366495A JPH095762A JP H095762 A JPH095762 A JP H095762A JP 15366495 A JP15366495 A JP 15366495A JP 15366495 A JP15366495 A JP 15366495A JP H095762 A JPH095762 A JP H095762A
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liquid crystal
substrate
crystal panel
substrates
liquid crystals
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JP15366495A
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Japanese (ja)
Inventor
Kazuhiro Jiyouten
Shinichi Miyata
Hiroyuki Okada
一浩 上天
慎一 宮田
裕之 岡田
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Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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Abstract

PURPOSE: To prevent the occurrence of the unequal display in a panel surface caused by the influence of various kinds of impurities existing in an atmosphere for producing a liquid crystal panel. CONSTITUTION: The sticking speed at the time of holding liquid crystals 8 by a dropping method between two sheets of glass substrates 1 and 2 subjected to orientation treatments on transparent electrode patterns 3, 4 is made sufficiently gentle and the liquid crystals are held at a temp. above the transparent point of the liquid crystals. The liquid crystal panel in which the impurities existing in the liquid crystals or on the substrates do not exist macroscopically unequally within the panel surface and the unequal display does not arise is produced by suppressing the influence of the external energy that the liquid crystals receive at the time of spreading on the substrates.

Description

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

【0001】 [0001]

【産業上の利用分野】本発明は液晶パネルの製造法に関し、特に液晶パネルの表示均一化に関するものである。 The present invention relates to an manufacturing method of the liquid crystal panel, and more particularly to a display uniformity of a liquid crystal panel.

【0002】 [0002]

【従来の技術】液晶ディスプレイ装置は、液晶の初期配向方位を液晶の異方性を利用した作用により他の配向状態に変化させ、それに伴う光学的特性の変化を利用した表示装置である。 2. Description of the Related Art Liquid crystal display device, an initial orientation direction of the liquid crystal is changed to another orientation state by the action utilizing the anisotropy of the liquid crystal, which is a display device using a change in optical properties associated with it. 従来の表示装置に比べ低電圧駆動が可能であり、LSI駆動に適すること、低電力消費タイプであること、薄型,軽量化が可能であること等から、近年、大画面化,大容量化によりOA機器への搭載を目指し、開発,商品化されつつある。 Is capable of low voltage driving as compared to the conventional display device, it is suitable for LSI driving, it is low power consumption type, thin, since such that weight reduction is possible, in recent years, a larger screen, the capacity aiming to be incorporated in OA equipment, development, it is being commercialized.

【0003】現在、液晶の電場印加による配列状態の変化、即ち電気光学特性を利用した単純マトリックス方式のスーパーツイステッドネマティック(STN)形ディスプレイ装置が主体をなし、アクティブマトリックス方式の薄膜トランジスタ(TFT)形ディスプレイ装置がこれに続く。 At present, changes in orientation state by the liquid crystal of the electric field application, i.e. super-twisted nematic simple matrix utilizing electro-optical properties (STN) form display device forms the principal, active matrix type thin film transistor (TFT) form display device follow. 液晶ディスプレイ装置は透明電極膜を形成した2枚のガラス基板間に液晶を挟んだサンドイッチタイプであり、透明電極膜上には液晶を配向させるための高分子薄膜を形成させる。 The liquid crystal display device is a sandwich-type sandwiching the liquid crystal between two glass substrates to form a transparent electrode film, the on the transparent electrode film to form a polymer thin film for aligning the liquid crystal. STN形ディスプレイ装置の場合、2枚の基板間のセル厚は5〜7μm程度であり、高分子薄膜上をラビングすることで液晶の配向を制御し、 For STN type display device, the cell thickness between the two substrates is about 5 to 7 .mu.m, to control the orientation of liquid crystal by rubbing on the polymer film,
3〜8゜程度のプレチルト角(基板と液晶分子のなす起き上がり角)を持たせる。 3-8 to have a degree of about pretilt angle (an rising angle of the substrate and the liquid crystal molecules). STN形ディスプレイ装置は液晶の複屈折性と光の旋光性を利用したものであり、2 STN type display device is obtained by utilizing the optical rotation of the liquid crystal birefringence and light, 2
枚の基板間で液晶の配向方向を180゜〜270゜捻ることで著しく急峻なしきい値特性を得ることを可能にしているため、セル厚は0.05〜0.1μmの精度を必要とする。 Because it allows the orientation direction of the liquid crystal attain much steeper threshold characteristics by twisting 180 degrees to 270 degrees between the substrates, the cell thickness requires accuracy 0.05 to 0.1 [mu] m.

【0004】液晶パネルの光学特性は、液晶分子の持つ複屈折性,誘電率異方性等により得られる。 [0004] The optical characteristics of the liquid crystal panel, birefringence possessed by the liquid crystal molecules, obtained by the dielectric anisotropy and the like. その他粘性,弾性定数等を含め用いる液晶材料の組成、その成分比の調整により液晶パネルの光学特性は変化する。 Other viscosity, the composition of the liquid crystal material used including the elastic constants and the like, the optical characteristics of the liquid crystal panel by adjusting the component ratio is changed. 現在様々な液晶材料が開発されており、液晶材料の調合により望みの特性を得ることが可能である。 Currently have been developed various liquid crystal materials, it is possible to obtain the characteristics desired by the formulation of the liquid crystal material.

【0005】通常、数種類以上の液晶分子を混ぜ合わせた所望の液晶を、滴下法(特開昭63−179328号公報)あるいは真空注入法により2枚の基板間に狭持する。 [0005] Usually, the desired liquid crystal obtained by mixing the liquid crystal molecules of the above several types are sandwiched between the two substrates by a dropping method (JP 63-179328 JP) or vacuum injection method. 液晶滴下法は一方のガラス基板上にスペーサーを分散させ、数本のシリンジ内に用意した液晶を他方のガラス基板上に一定パルスで滴下する工法である。 The liquid crystal dropping method by dispersing spacers on one of the glass substrates, a method of dropping at a constant pulse a liquid crystal which is prepared in several syringe to the glass substrate.

【0006】 [0006]

【発明が解決しようとする課題】現在、液晶滴下法により液晶パネルを作製する場合、液晶を狭持するために配向処理した2枚の基板の一方の基板に液晶を滴下し、それと対をなす他方の基板を真空雰囲気下で貼り合わせた後リークすることにより液晶パネルを作製する。 [0005] Currently, in the case of manufacturing a liquid crystal panel by a liquid crystal dropping method, liquid crystal is dropped on two one substrate of a substrate on which the alignment process to sandwich the liquid crystal, the same pairs manufacturing a liquid crystal panel by leakage after bonding the other substrate in a vacuum atmosphere. しかし2枚の基板を貼り合わせる速度は、基板の自然落下速度、及び真空状態からのリークによる外圧に依存しており特に貼り合わせ速度の調整は行われていなかった。 But the rate of bonding two substrates, natural fall velocity of the substrate, and leakage in particular bonding speed adjustment depends on external pressure due to the vacuum state has not been performed.

【0007】ところで貼り合わせ前の基板上及び液晶中には、パネル製造時の雰囲気に応じた不純物が存在する。 [0007] The substrate and the liquid crystal prior to bonding the way, impurities are present in accordance with the atmosphere during panel manufacturing. この不純物が液晶中に溶解、あるいは分散している場合、液晶が伸び広がるときに基板上で不純物の濃度分布が生ずる。 If the impurities are dissolved in the liquid crystal, or dispersed, the concentration distribution of the impurity occurs on the substrate when the liquid crystal is spread elongation. このとき基板上に滴下した液晶の広がりを強制的かつ急激に行うことにより不純物の濃度分布はより顕著となる。 Concentration distribution of the impurity by performing this when the liquid crystal spread was dropped onto the substrate to force and rapidly becomes more pronounced.

【0008】このようなクロマト現象は液晶パネル面内で配向膜のプレティルト変化、電気二重層の形成をもたらし、それによるしきい値変化により液晶パネル面内で表示ムラが発生するという問題があった。 [0008] Such chromatographic behavior pretilt change of the alignment layer in the liquid crystal panel surface, results in an electric double layer formation, it by display unevenness in the LCD panel by the threshold change is a problem that occurs . このクロマト現象は液晶中または基板上の不純物量、液晶への溶解度、基板表面の吸着能に左右される他、液晶の広がり速度、流れ方向にも影響を受ける。 This chromatographic behavior amount of impurities on the crystal or in the substrate, solubility in liquid crystal, the other dependent on the adsorption capacity of the substrate surface, the liquid crystal of the spread rate, in the flow direction affected.

【0009】本発明は、このような点に鑑み、2枚の基板間に液晶を狭持する過程において、液晶に加わる外部応力、基板上での液晶の広がり速度を制御することにより液晶パネル面内で偏った不純物濃度分布が発生することを防止し、液晶パネル面内で表示が均一な液晶パネルが得られる製造法を提供することを目的とする。 [0009] In view of the above problems, in the process of sandwiching the liquid crystal between two substrates, the liquid crystal panel surface by controlling external stress applied to the liquid crystal, the liquid crystal spread rate on a substrate prevents the impurity concentration distribution biased in inner occurs, and an object thereof is to provide a manufacturing method of the display is uniform crystal panel obtained by the liquid crystal panel surface.

【0010】 [0010]

【課題を解決するための手段】本発明は上記目的を達成するため、電極パターン上に配向処理を施した2枚の基板間に、液晶滴下工法により液晶を狭持してなる液晶パネルにおける基板貼り合わせ工程において、その貼り合わせ速度を調整することにより前記2枚の基板間に液晶が伸び広がる速度を調節し、液晶滴下工法に係わる表示ムラを軽減することを特徴とする。 Since the present invention SUMMARY OF] is to achieve the above object, the substrate between two substrates subjected to alignment treatment on the electrode pattern, in the liquid crystal panel formed by sandwiching a liquid crystal by the liquid crystal dropping process in the bonding step, to adjust the rate at which the liquid crystal spreads extending between said two substrates by adjusting the bonding speed, characterized in that to reduce the display unevenness related to the liquid crystal dropping process.

【0011】 [0011]

【作用】本発明によれば、液晶の広がり速度を十分緩やかに調整することにより液晶中に溶解,分散した不純物は急激な外部エネルギー、具体的には基板と垂直方向の押圧による基板面に平行な応力を受けることなく、マクロ的には液晶中に均一に存在したまま基板上に広がる。 According to the present invention, dissolved in the liquid crystal by a liquid crystal spread rate adjusting sufficiently slowly, parallel to the substrate surface by dispersing impurities sudden external energy, specifically pressing the substrate and the direction perpendicular to without being subjected to such stresses, the macroscopic spread on a substrate while remaining uniformly in the liquid crystal.
また液晶の広がり速度が遅くなることで基板上に存在する不純物が液晶から受けるエネルギーも小さくなり、物理吸着レベルでも液晶の流れに影響されることなく基板上の既存の位置に残存し不純物の濃度分布に関与しない。 The concentration of energy impurities present on the substrate by spreading speed of the liquid crystal becomes slow receives from the liquid crystal is reduced and remains in the existing positions on the substrate without also being influenced by the flow of the liquid crystal at the physical adsorption levels of impurities not involved in the distribution.

【0012】また液晶の透明点以上の温度で基板を貼り合わせて液晶を狭持する場合、液晶中への不純物の溶解性が高まる。 [0012] When sandwiching the liquid crystal by bonding the substrate with a transparent point above the temperature of the liquid crystal, increasing solubility of impurities into the liquid crystal in the. 即ち液晶中に不純物が存在した場合にもたらす分子配列の不安定性に対する影響が弱まり、液晶が広がるときに無理な外部応力を受けても液晶中の不純物が分離、あるいは偏在しにくい。 That weakened effect on instability molecule sequences that result when impurities in the liquid crystal is present, impurities even in the liquid crystal undergoing excessive external stress when the liquid crystal is spread separation, or hardly unevenly distributed.

【0013】従って液晶を基板上で十分緩やかに広げることにより基板上での不純物濃度分布の偏りを抑制し、 [0013] Thus to suppress the deviation of the impurity concentration distribution on the substrate by extending sufficiently gentle liquid crystal on the substrate,
パネルの表示ムラを防止し表示品位の均一化を図るものである。 Uneven display panel is intended to achieve uniformity of preventing display quality of. なお、液晶の透明点以上の温度で液晶を狭持することにより液晶を基板上で十分緩やかに広げることによる効果が一層高まるものである。 Incidentally, in which effect is further enhanced by widening sufficiently gentle liquid crystal on the substrate by sandwiching the liquid crystal at a temperature above the clearing point of liquid crystal.

【0014】 [0014]

【実施例】図1は本発明の第1および第2の実施例における液晶パネルの製造方法を示す工程図である。 DETAILED DESCRIPTION FIG. 1 is a process diagram showing a method of manufacturing a liquid crystal panel in the first and second embodiments of the present invention.

【0015】(実施例1)まず、図1(1)に示すように、透明電極パターン3,4を設けたそれぞれのガラス基板1,2上にフレキソ印刷法により配向膜6(ポリイミド配向膜)を形成、熱硬化した後、表面をラビングすることにより配向性を持たせる。 [0015] (Example 1) First, as shown in FIG. 1 (1), oriented by flexographic printing onto each glass substrate 1 provided with the transparent electrode patterns 3 and 4 film 6 (polyimide alignment film) forming, after thermal curing, to have orientation by rubbing the surface. このとき対向基板間で後述する図3に示す液晶8の分子が240゜捻れる方向に配向処理を施し、ガラス基板1には後述する図3に示す、例えば7.0μmのスペーサー7を均一に分散させる。 At this time subjected to molecular orientation treatment to 240 ° twisted direction of the liquid crystal 8 shown in FIG. 3 to be described later between the counter substrate, the glass substrate 1 shown in FIG. 3 to be described later, for example, uniformly dispersing the spacers 7 of 7.0μm make.

【0016】次に滴下ステージ10上に他方のガラス基板2を配置し、そのガラス基板2上に滴下シリンジ9に収められた3本のガラスシリンジ内に吸引したカイラル剤入り液晶8(ネマティック液晶)を滴下する。 [0016] Then place the other glass substrate 2 on the dropping stage 10, a glass substrate 2 on the dropping syringe 9 matches was 3 chiral agent mixed sucked into a glass syringe of the present liquid crystal 8 (a nematic liquid crystal) It is added dropwise. 後述する図2,図3に示すシール剤5にはUV硬化樹脂を使用し、 2 to be described later, using a UV curing resin for the sealing material 5 as shown in FIG. 3,
予めスペーサー7を1.5wt%の割合で含有させた後、スクリーン印刷によりスペーサー7を分散させた基板に印刷する。 After pre-spacer 7 is contained in a proportion of 1.5 wt%, it is printed on the substrate by dispersing a spacer 7 by screen printing.

【0017】次に図1(2)に示すように基板貼り合せステージ11上でガラス基板2の上方10mmの位置にガラス基板1をガラス基板2と平行になるように上下可動ピン12 [0017] Then the upper and lower movable pins 12 to the glass substrate 1 is parallel to the glass substrate 2 at a position above 10mm glass substrate 2 on the substrate bonding stage 11 as shown in FIG. 1 (2)
で保持した後、真空ポンプ15に真空チャンバー14内を真空に引く。 After holding in, pulling the vacuum chamber 14 to a vacuum to the vacuum pump 15. その後、上下可動ピン12を5mm/secの速度で緩やかに降下させ、ガラス基板1,2を図1(3)に示すように貼り合わせる。 Thereafter, the upper and lower movable pins 12 is gradually lowered at a speed of 5 mm / sec, bonding the glass substrates 1 and 2 as shown in FIG. 1 (3).

【0018】上記ガラス基板1,2を貼り合わせる場合の貼り合わせ速度を十分緩やかに調整可能とすることにより、基板上での液晶8の広がり速度を十分緩やかなものとし、このプロセスを液晶の透明点以上で行うことを特徴とするものである。 [0018] With sufficiently loosely adjustable the bonding rate of the case of bonding the glass substrates 1 and 2, the spread speed of the liquid crystal 8 in the substrate and sufficiently gradual, transparent the process of the liquid crystal it is characterized in that performed at the point or more.

【0019】次に図1(3)に示すように上下可動ピン12 [0019] Then the upper and lower movable pins 12 as shown in FIG. 1 (3)
を更に降下させ、貼り合わせたガラス基板1,2をリークし、後述する図2,図3に示すシール剤5をUV照射して硬化する。 Further lowered, leak glass substrates 1 and 2 were bonded, FIG. 2 to be described later, cured by UV irradiation of sealant 5 shown in FIG. これにより、図2の平面図,図3の断面図に示すような液晶パネルを作製できる。 Thus, the plan view of FIG. 2, the liquid crystal panel as shown in the sectional view of FIG. 3 can be manufactured.

【0020】ここで、図2および図3において、1はセグメント電極3が設けられたガラス基板、2はコモン電極4が設けられたガラス基板であり、図1ではセグメント電極3,コモン電極4を単に透明電極パターン3,4 [0020] Here, in FIGS. 2 and 3, 1 denotes a glass substrate which segment electrodes 3 are provided, 2 is a glass substrate having the common electrode 4 is provided, FIG. 1, the segment electrode 3, the common electrode 4 simply transparent electrode patterns 3
と呼んでいる。 That call. 5はUV硬化樹脂を使用したシール剤であって、図3に示すようにスペーサー7が入った液晶8 5 is a sealant using UV curable resin, liquid crystal 8 containing the spacers 7 as shown in FIG. 3
の周囲をシールする。 To seal the perimeter of. 6は前記ガラス基板1,2上のセグメント電極3,コモン電極4上に設けられた配向膜である。 6 segment electrode 3 on the glass substrate 1, a orientation film provided on the common electrode 4.

【0021】上記図2および図3に示す液晶パネルにスタティック波形を印加し液晶パネルを点灯評価した結果、液晶滴下位置に依存した表示ムラは殆どなく、滴下位置とその周囲とのしきい値電圧(最大透過率を100%としたときの透過率10%となる電圧)差としては10mV以下であった。 [0021] FIG. 2 and by applying a static waveform results lit evaluated crystal panel in the liquid crystal panel shown in FIG. 3, display unevenness dependent on the liquid crystal dropping position is little, the dropping position and the threshold voltage of the surrounding as the difference (the maximum transmittance voltage becomes transmittance of 10% is taken as 100%) were 10mV or less.

【0022】(実施例2)実施例1における図1(2)の基板貼り合せステージ11の下方に加熱ヒーター13を設けステージ表面温度を滴下する液晶8の透明点以上の温度とした後、実施例1と同様の作業を行った。 [0022] (Example 2) was 1 and a temperature above the clearing point of the liquid crystal 8 of dropping stage surface temperature provided with a heating heater 13 below the substrate bonding stage 11 (2) in Example 1, performed examples were subjected to the same work as one. その結果、 as a result,
表示ムラは全く発生せず、滴下位置とその周囲でしきい値電圧差としても検出されなかった。 Display unevenness does not occur at all, it was detected as the threshold voltage difference around the dropping position.

【0023】(比較例1)ガラス基板1をガラス基板2 [0023] (Comparative Example 1) A glass substrate 2, a glass substrate 1
の上方10mmの位置から自然落下し、実施例1と同様の評価を行ったところ、滴下位置に依存した表示ムラが発生し、滴下位置とその周囲で30mV程度のしきい値差が確認された。 Of naturally fall from a position above 10 mm, was evaluated in the same manner as in Example 1, occurs display unevenness dependent on the dropping position, threshold difference of about 30mV at around the dropping position was confirmed .

【0024】 [0024]

【発明の効果】以上説明したように本発明の液晶パネルの製造方法は、液晶パネルの基板貼り合わせ速度を十分に遅くし、更に場合によっては液晶の透明点以上の温度で貼り合わせを行うことにより、従来の滴下工法で発生するようなパネル面内の表示ムラのない均一な液晶パネルを作製することが可能である。 Method of manufacturing a liquid crystal panel of the present invention as described above, according to the present invention is sufficiently slow substrate bonding speed of the liquid crystal panel, by performing the bonding at a temperature above the clearing point of liquid crystal is further optionally Accordingly, it is possible to produce a uniform liquid crystal panel without display unevenness in a panel plane as occurs in conventional dropping process.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の第1,第2の実施例における液晶パネルの製造方法を示す工程図である。 [1] first present invention is a process diagram showing a method of manufacturing a liquid crystal panel in the second embodiment.

【図2】本発明の方法で製造された液晶パネルの平面図である。 2 is a plan view of the liquid crystal panel manufactured by the method of the present invention.

【図3】図2の液晶パネルの断面図である。 3 is a cross-sectional view of a liquid crystal panel of FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

1…セグメント電極側のガラス基板、 2…コモン電極側のガラス基板、 3…セグメント電極、 4…コモン電極、 5…スペーサー入りUV硬化樹脂シール剤、 1 ... segment electrode side glass substrate, the glass substrate 2 ... common electrode side, 3 ... segment electrode, 4 ... common electrode, 5 ... spacer containing UV curable resin sealant,
6…配向膜、 7…スペーサー、 8…液晶、 9…滴下シリンジ、 10…滴下ステージ、 11…基板貼り合せステージ、 12…上下可動ピン、 13…加熱ヒーター、 6 ... orientation film, 7 ... spacer, 8 ... liquid crystal, 9 ... dropping syringe, 10 ... dropping stage, 11 ... substrate lamination stage, 12 ... vertical moving pin 13 ... heater,
14…真空チャンバー、 15…真空ポンプ。 14 ... vacuum chamber, 15 ... vacuum pump.

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 電極パターン上に配向処理を施した2枚の基板間に、液晶滴下工法により液晶を狭持してなる液晶パネルにおける基板貼り合わせ工程において、その貼り合わせ速度を調整することにより前記2枚の基板間に液晶が伸び広がる速度を調節し、液晶滴下工法に係わる表示ムラを軽減することを特徴とする液晶パネルの製造法。 Between 1. A two subjected to alignment treatment on the electrode patterned substrate in the bonding step the substrate in the liquid crystal panel formed by sandwiching a liquid crystal by the liquid crystal dropping process, by adjusting the bonding rate preparation of a liquid crystal panel, wherein the adjusting the rate at which the liquid crystal is spread extends between two substrates, to reduce the display unevenness related to the liquid crystal dropping process.
  2. 【請求項2】 液晶の透明点以上の温度で2枚の基板間に液晶を狭持することを特徴とする請求項1記載の液晶パネルの製造法。 2. A method for producing a liquid crystal panel according to claim 1, wherein the sandwiching liquid crystal between two substrates at a temperature above the clearing point of the liquid crystal.
JP15366495A 1995-06-20 1995-06-20 Production of liquid crystal panel Pending JPH095762A (en)

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