JPH0457028A - Active matrix type liquid crystal device - Google Patents
Active matrix type liquid crystal deviceInfo
- Publication number
- JPH0457028A JPH0457028A JP16870290A JP16870290A JPH0457028A JP H0457028 A JPH0457028 A JP H0457028A JP 16870290 A JP16870290 A JP 16870290A JP 16870290 A JP16870290 A JP 16870290A JP H0457028 A JPH0457028 A JP H0457028A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- polyimide
- alignment film
- active matrix
- crystal device
- 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.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 54
- 239000011159 matrix material Substances 0.000 title claims description 17
- 229920001721 polyimide Polymers 0.000 claims abstract description 41
- 239000004642 Polyimide Substances 0.000 claims abstract description 39
- 239000000758 substrate Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000002441 X-ray diffraction Methods 0.000 claims description 8
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 abstract description 13
- 150000004985 diamines Chemical class 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 abstract description 9
- 230000006866 deterioration Effects 0.000 abstract description 8
- 239000011521 glass Substances 0.000 abstract description 7
- 125000006158 tetracarboxylic acid group Chemical group 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract 1
- 238000009833 condensation Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 34
- 239000002253 acid Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229920005575 poly(amic acid) Polymers 0.000 description 5
- 239000004744 fabric Substances 0.000 description 3
- 239000002966 varnish Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910016523 CuKa Inorganic materials 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
産業ｌ−１の利用分野
本発明は、画作表示パネル等ここ用いられるアクティブ
マトリックス型液晶装置に関し、特にポリイミドｔｌ利
の配向膜をイアするアクティフマトリックス型液晶装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Application of Industry 1-1 The present invention relates to an active matrix type liquid crystal device used in image production display panels and the like, and particularly to an active matrix type liquid crystal device using a polyimide TL alignment film. It is.
ｉｉ℃来の技術
従来、画素ことζこ薄膜トランジスダ（ＴＰＴ）やタイ
オーＩ・等のスイッチング素子を設げたアクティフマト
リックス型・液晶表示パネルは、（伐晶テレヒ等の種々
のティズブ１ノイ■」こ応用されている。Previously, active matrix type liquid crystal display panels equipped with switching elements such as thin film transistors (TPTs) and switching elements such as pixel elements (also known as pixels) have been used in various types of technology such as TV screens. This is applied.
このアクティツマ）・す・ソクス’！＋！、 ？Ｌ’１
品表示バ老ルには、配向膜か設けられている。この液晶
表示パネルの配向膜とし・では、耐熱性、１旨頼性に優
れたポリイミドが実用材料として専ら用いられでいる。This Actitsuma)・Su・Soku'! +! , ? L'1
The product display bar is provided with an alignment film. For the alignment film of this liquid crystal display panel, polyimide, which has excellent heat resistance and reliability, is exclusively used as a practical material.
ポリイミド膜は通常テＩ□ ’５カルホン酸二無水物成
分とジアミン成分の反応でｆｉＦ ＋’、れるポリアミ
ック酸の膜を基板上に塗布形成後、高温で焼成−イミド
ＩＬさせて１１）られる。また、静辺はイミド化した状
態で溶媒にＦｉＪ溶１１−シた９イブのものも用いられ
ている。基板−Ｌに形成したこの配向膜表面を柔らかい
布などで一定方向に擦るラビング処理によって、液晶の
一軸配向性が付与されている。A polyimide film is usually produced by coating a polyamic acid film on a substrate to form a film of fiF +' by a reaction between a carbonic dianhydride component and a diamine component, and then baking the film at a high temperature and subjecting it to imide IL (11). Furthermore, a 9-ib one is also used in which the static side is imidized and is dissolved in FiJ 11-I in a solvent. Uniaxial alignment of the liquid crystal is imparted by rubbing the surface of the alignment film formed on the substrate-L in a fixed direction with a soft cloth.
発明が解決しようとする課題
ところで、スイッチング素子としで、例えば′Ｉ゛ＦＴ
を用いたアクティブマトリックス型液晶パネルにおいて
、連続使用するとＴＰＴのＯＦＦ特性の劣化が起こるこ
とがある。この０１” Ｆ特性が劣化するとＴ Ｐ Ｔ
のＯＦＦ時にソース・トレイン間を流れるリーク電流が
増加し、液晶層に加わる実効電圧が抵下してしまい、表
示画像の劣化となって現れる。Problems to be Solved by the Invention By the way, as a switching element, for example, 'I゛FT
In active matrix liquid crystal panels using TPT, the OFF characteristics of the TPT may deteriorate if used continuously. When this 01” F characteristic deteriorates, T P T
When the LCD is turned off, the leakage current flowing between the source and the train increases, and the effective voltage applied to the liquid crystal layer drops, resulting in deterioration of the displayed image.
本発明はこのような従来の液晶表示パネルの課題を考慮
し、特性の劣化を解消したアクテ、イブマトリックス型
液晶装置を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in consideration of the problems of conventional liquid crystal display panels, and an object of the present invention is to provide an actuator matrix type liquid crystal device that eliminates the deterioration of characteristics.
課題を解決するための手段
本発明は、画素ことにスイッチング素子が設けられたア
クティフマトリックス型液晶装置において、基板上に形
成された液晶配向膜の材料が、結晶性ボリイミＩ・であ
ることを特徴とするアクティフマトリックスにり液晶装
置である。Means for Solving the Problems The present invention provides an active matrix type liquid crystal device in which pixels, especially switching elements, are provided, in which the material of the liquid crystal alignment film formed on the substrate is crystalline polyimide I. This is an active matrix liquid crystal device.
作用
例えは、１’ Ｆ ＴのＯＦＦ特性が劣化する原因とし
て、配向膜の分極が考えられる。その分極機構とし・て
、配向膜ポリイミド中に存在する極性基の配向分極や、
電極からの電荷注入が考えられる。As an example of the effect, polarization of the alignment film can be considered as a cause of deterioration of the OFF characteristics of 1' F T. The polarization mechanism is the orientation polarization of the polar groups present in the alignment film polyimide,
Charge injection from the electrodes is considered.
すなわち、ｉ’ Ｉ” ｉ’ −Ｌ、 ＣＤ−Ｃは、ｉ
’ Ｉ” ｉ” −１−に配向膜が存在するため、液晶
パネルの駆動時に発生ずるＩ）０電圧の影響て配向膜の
分極が起こり、この分極の結果発生した電界によって１
’ Ｆ Ｔの特性がシフトすると考えられる。That is, i'I"i' -L, CD-C is i
Since there is an alignment film at 'I"i" -1-, polarization of the alignment film occurs due to the influence of the I) 0 voltage that occurs when the liquid crystal panel is driven, and the electric field generated as a result of this polarization causes 1
' It is thought that the characteristics of FT shift.
この分極が起こる原因を分子構造の面からみると、分子
構造甲乙こ介まれる極性基が配向することや、極性基が
電荷のトラップ中心となっていることが考えられる。こ
のような分極現象は、とくに分子運動の束縛が弱いアモ
ルファス領域で起こりやすく、結晶領域では起こりにく
い。Looking at the causes of this polarization from the perspective of molecular structure, it is thought that the polar groups interposed in the molecular structure are oriented, and that the polar groups act as charge trapping centers. Such a polarization phenomenon is particularly likely to occur in an amorphous region where molecular motion is weakly constrained, and less likely to occur in a crystalline region.
そこで、本発明ては、配向膜の材料が結晶性ポリイミド
であるので、分極現象が制御され、連続駆動時の１’
Ｆ Ｔ特性のシフトが小さくなる。Therefore, in the present invention, since the material of the alignment film is crystalline polyimide, the polarization phenomenon is controlled and the 1'
FT characteristic shift becomes smaller.
実施例
以下に本発明の実施例を図面を参！！ζ（して説明する
。Examples Please refer to the drawings for examples of the present invention below! ! ζ(Explain.
第１図は本発明にかかるアクティブマトリッグス型液晶
装置の一例としての液晶表示パネル化こ用いられている
液晶素子の模式断面図である。液晶３の両側に配向膜４
、透明電極５、カラス基板６が配されている。この配向
膜４の月利は結晶ポリイミドである。FIG. 1 is a schematic cross-sectional view of a liquid crystal element used in a liquid crystal display panel as an example of an active matrix type liquid crystal device according to the present invention. Alignment film 4 on both sides of liquid crystal 3
, a transparent electrode 5, and a glass substrate 6 are arranged. This alignment film 4 is made of crystalline polyimide.
そもそもアクティブマトリックス型液晶表示パネルにお
いて設けられている、配向膜材わ１のポリイミドは、テ
トラカルボン酸二無水物とジアミンが縮合重合した構造
をもっている。In the first place, the polyimide of the alignment film material 1 provided in the active matrix type liquid crystal display panel has a structure in which tetracarboxylic dianhydride and diamine are condensed and polymerized.
ポリイミド′は印刷性、耐熱性、液晶配向性、長Ｉｎ信
頼性など優れた特性を有しているので、配向膜材料にふ
されしい。Polyimide' has excellent properties such as printability, heat resistance, liquid crystal orientation, and long-term In reliability, and is therefore suitable as an alignment film material.
以下に示す実施例および比較例においては、スイッチン
グ素子の一例として、逆スタガー構造のアモルファスシ
リコノＴ Ｐ Ｔを有するアクティブマトリックス型フ
ルカラー液晶パネルを用いている。その１ノイズ、構成
は対角１． １インチ、ゲートライン数２２０本、ソー
スライン数３５２本である。対向電極はＲ，Ｃ，Ｂの）
Ｊシーフィルター上に全面電極として形成されており、
ＴＦＴ側基板の間隙に？α品が充填されている。液晶表
示モーｌζは電圧無印加時に光を遮断するネカダイブの
′ｒＮモーＩζを用いる。液晶パネルのギャップは、用
いた液晶月利の屈折率の異方性から、クーチとタリーの
式によって計算される：゛１１ントラスＩ最適１１αに
設定されている。In the Examples and Comparative Examples shown below, an active matrix full color liquid crystal panel having an amorphous silicone TPT having an inverted staggered structure is used as an example of a switching element. Part 1 noise, configuration is diagonal 1. It is 1 inch, has 220 gate lines, and 352 source lines. The counter electrodes are R, C, B)
It is formed as a full-surface electrode on the J-sea filter.
In the gap between the TFT side substrate? Item α is filled. The liquid crystal display mode Iζ uses Nekadive's 'rN mode Iζ, which blocks light when no voltage is applied. The gap of the liquid crystal panel is calculated by the Couch and Tully formula from the anisotropy of the refractive index of the liquid crystal used: The gap of the liquid crystal panel is set to the optimal value of 11 α.
第２図はその実施例および比較例に用いた液晶パネルの
一画素の典型的等価回路である。第３図はその等価回路
のゲ・−］・ラインの駆動電圧波形を示したものである
。この等価回路においては、ゲート電圧■８を変化させ
て１’ Ｆ Ｔ １をＯＮ、ＯＦＦし、ソース１ｈ号Ｖ
ｓを液晶２及び補助容ｔ３に充電する。第３図に示ずと
おりＴ Ｆ ｉ’ ｌのＯＮ電圧は１４Ｖ、ＯＦＦ電圧
は一７■である。ＴＦＴ １は０■てＯＦＦできるよう
に設計されており、ＯＦＦ電圧が一７■に設定しである
のは、７■のＯＦＩ？マージンを見込んた設定である。FIG. 2 shows a typical equivalent circuit of one pixel of the liquid crystal panel used in the examples and comparative examples. FIG. 3 shows the driving voltage waveform of the G-] line of the equivalent circuit. In this equivalent circuit, 1' F T 1 is turned on and off by changing the gate voltage 8, and the source 1h V
s is charged to the liquid crystal 2 and the auxiliary container t3. As shown in FIG. 3, the ON voltage of T F i' I is 14V, and the OFF voltage is 17V. TFT 1 is designed to be turned off at 0■, and the OFF voltage is set to 17■ because it is 7■ OFI? This setting takes into account the margin.
ところで、第３図に示す駆動信号を連続して印加してい
ると、ＯＦ ＋”マージンが減少し−ｃくる。By the way, when the drive signal shown in FIG. 3 is continuously applied, the OF +'' margin decreases to -c.
つまζｌ、”Ｉ’ Ｆ Ｔ １を実際にＯＦ Ｆできる
電５’Ｅレベルカマイナス側ヘシフトする。そして、つ
いには７■よりも小さくなり、設定したＯ Ｆ ｌ？電
圧ｌノｌ〈ルでは′［’ ｌ” Ｔ ＩをＯＦ Ｆでき
なくなってじよう。In other words, the voltage 5'E level that can actually be turned off is shifted to the negative side.Then, it finally becomes smaller than 7■, and at the set OFF voltage level, ′ [' l” I feel like I can't turn OFF.
こうなると′Ｉ″Ｆ ′ｒ１のＯＮ時に充電された電荷
を保持てきず、液晶２こごかかる電圧が１［（１ζしで
しまい、ＩＥ常な表示ができなくなる。これが前に述へ
た、液晶パネルを連続駆動した場合のＴ ［どＩ゛特性
劣化現象である。なお、連続、駆動によって１’ ＦＴ
ｌをＯＮずろための電圧レベルはほとんど変化しない。In this case, the charge charged when 'I''F'r1 is turned on cannot be retained, and the voltage applied to the liquid crystal 2 becomes 1[(1ζ), making it impossible for the IE to display normally.This is as mentioned earlier. This is a characteristic deterioration phenomenon when a liquid crystal panel is continuously driven.
The voltage level for turning on 1 hardly changes.
このような”「Ｆ ′ｒ １のＯＦＦ特性劣化を調へる
尺度としてＶｇ（−）を次のように定義する６ 液晶パ
ネルを最大透過状態とし、Ｖ ｇＯ） ＯＦ ＋？主電
圧ｌ＼ルをマイナス側か１）プラス側（こ変化させた時
、画像に影響をりえない最低の電圧値をＶｇ（−）とし
ノｓ、Ｖｇ（−）がマイナス側へシフトシ・、−７Ｖよ
りも低くなってしまうとｉ’ ｌ？ ｉ’ ｌを完全乙
こ０Ｆ１７することができなくなり、輝度低下が起こる
。Vg(-) is defined as follows as a measure to check the deterioration of the OFF characteristic of F'r1.6 With the liquid crystal panel in the maximum transmission state, VgO)OF +?main voltage l\r 1) to the negative side or to the positive side (when changing this, the lowest voltage value that does not affect the image is set to Vg(-)), Vg(-) shifts to the negative side, lower than -7V. If this happens, it will no longer be possible to completely reduce i'l?i'l to 0F17, resulting in a decrease in brightness.
以下に具体的な実施例と比較例を挙げて、本発明をより
；ｉ′１′キ１１１に説、明ずろ。The present invention will be further explained below with reference to specific examples and comparative examples.
実施例１
配向膜１１にＦ 、ｉｉ！構造式のテトラカルｉ１＜ン
酸二無水物成分とシアミン成分からなるポリイミドへを
用いた。Example 1 F on the alignment film 11, ii! A polyimide having the structural formula of tetracari1<acid dianhydride component and cyamine component was used.
（ポリイミドへの酸二無水物成分）
ＩＩ ２ Ｎ −ＣＩＩ ２Ａ ＣＩＩ ２
ン［Ｃ１１２−Ｎ ｔｌ ２くポリイミドへのシア
ミン成分）
そしてＴ Ｆ Ｔ ｌ付きの基板」−に配向膜４として
このポリイミドＡのポリアミック酸フェスを塗布し、２
５０°Ｃで焼成して１００〇八厚に形成した。(Acid dianhydride component to polyimide) II 2 N -CII 2A CII 2
A polyamic acid face of this polyimide A was applied as an alignment film 4 to the substrate with T F T l, and
It was fired at 50°C and formed to a thickness of 10,008 mm.
ラビングによる配向処理を行いｈ記の液晶パネルを作製
した。The liquid crystal panel described in h was prepared by performing alignment treatment by rubbing.
この液晶パネルを６０℃で１００時間連続駆動したとき
のＶｇ（−）を測定しノ表１に示した。When this liquid crystal panel was continuously driven at 60°C for 100 hours, Vg(-) was measured and shown in Table 1.
またカラス基板６１． に杓５０００八厚に形成したボ
リイミｌ’ Ａの２５０℃焼成膜のＸ線回折測定を行な
・っか。Also, the crow board 61. X-ray diffraction measurements were carried out on a polyimide film formed to a thickness of 5,000 mm and fired at 250°C.
ＣｕＫａ線を用いて測定したＸ線回折パターンを第４図
に示した。波長は１．５４Ａである。’＃Ｓ７１図から
明かかように、本実施例ζこ用いたポリイミド八では、
明瞭なピークが認められ、結晶性であることがわかる。The X-ray diffraction pattern measured using CuKa radiation is shown in FIG. The wavelength is 1.54A. As is clear from Figure #S71, in the polyimide 8 used in Example ζ,
A clear peak was observed, indicating that it was crystalline.
その散乱ピークから求めた回折面間隔と、その′−１月
１α幅を表２ζご示した。Table 2ζ shows the diffraction plane spacing determined from the scattering peak and its '-1α width.
実施例２
配向膜４に下記構造式のデトラカルボン酸二無水物成分
とジアミン成分からなるポリイミド１（を用いた。Example 2 Polyimide 1 consisting of a detracarboxylic dianhydride component and a diamine component having the following structural formula was used for the alignment film 4.
（ポリ−イミドＩ３の酸二無水物成分）１しＮ−Ｃ１］
２−（（シ１１２）ｒ〜（旧＋２−Ｎ［Ｉ２（ポリイミ
ド［３のジアミン成分）
１’ １７’ ｉ’ Ｉ ＬｌきのＪ層厚１−シー二配
向膜１としてポリ、イミ１ζＩ３のポリアミ・ツク酸１
ノ：−スをメチ布し、′、シ５０°Ｃて焼成しでｌ １
．） ００ ＡＪゾ乙ご形成した。、ラビングによる配
向処理を１丁い１．記の液晶パネルを作製した。(Acid dianhydride component of polyimide I3) 1N-C1]
2-((Si112)r~(old+2-N[I2(polyimide [diamine component of 3)] 1'17'i' I Polyamide tsucic acid 1
1. Cover the cloth with cloth and bake at 50℃.
．． ) 00 AJ was formed. , Orientation treatment by rubbing 1. The following liquid crystal panel was manufactured.
このｔｌＸｌＸ品用ネル ＯＴ、、てｌ ００時間連続
駆動したときのＶｇ（−）を測定し表１に示した。The Vg(-) of this tlXlX product panel was measured when it was continuously driven for 00 hours and is shown in Table 1.
またカラスＪｋ板〔）」−に＃、’Ｊ ５０００八厚に
１杉成したポリイミド［３の２５０″Ｃ焼成膜のＸ線回
ＩＪｉ測定を行なった。In addition, X-ray IJi measurements were carried out on a 250''C fired film of polyimide [3] formed on a glass Jk plate [)'' to a thickness of #, 'J 5000.
実施例１と同様、明瞭な回折ピークが認められ、結晶性
であることがわかった。その散乱ビークがら求めた回折
面間隔と、その半値幅を表２に示した。As in Example 1, clear diffraction peaks were observed, indicating that it was crystalline. Table 2 shows the diffraction plane spacing determined from the scattering peaks and its half-value width.
実施例３
配向膜／ｌに下記構造式のテトラカルボン酸二無水物成
分とジアミン成分からなるポリーイミＦ’ Ｃを用いた
。Example 3 A polyimide F'C consisting of a tetracarboxylic dianhydride component and a diamine component having the following structural formula was used for the alignment film/l.
（ボリイミ１８Ｃの酸二無水物成分）
Ｆ１２Ｎ−Ｃｌｌｐ ＣＣｌ１２）篩−ＣＩｆ ２−Ｎ
ＩＩ ２（ボリイミｌ’ Ｃのジアミン成分）
Ｔ Ｆ ｉ’ １１＝Ｊきの基板」二ζこ配向膜４とし
てポリイミド゛（コのポリアミック酸ワニスを塗布し、
２５０℃で焼成して１００ＯＡ厚に形成した。ラビング
による配向処理を行い上記の液晶パネルを作製した。(Acid dianhydride component of Boliimi 18C) F12N-Cllp CCl12) Sieve-CIf 2-N
II 2 (diamine component of polyimide l' C) T F i'11=J's substrate 2 ζ A polyamic acid varnish of polyimide (coated) as the alignment film 4,
It was fired at 250°C and formed to a thickness of 100 OA. The above liquid crystal panel was manufactured by performing alignment treatment by rubbing.
この液晶パネルを６０°Ｃて１（）０時間連続駆動した
ときのＶｇ（＝）を測定し表１に示した。The Vg (=) when this liquid crystal panel was continuously driven at 60° C. for 1 ()0 hours was measured and shown in Table 1.
またカラス基板６上に約５０００ Ａ Ｊゾに形成した
ボリイミＦ’ Ｃの２５０ ℃焼成膜のＸ線回折測定を
行なった。In addition, X-ray diffraction measurements were performed on a film of polyimide F'C formed on the glass substrate 6 to a thickness of about 5000 AJ and fired at 250°C.
実施例１と同様、明瞭な回折ピークが認められ、結晶性
であることがわかった。その散乱ピークから求めた回折
面間隔と、その半値幅を表２に示した。As in Example 1, clear diffraction peaks were observed, indicating that it was crystalline. Table 2 shows the diffraction plane spacing determined from the scattering peak and its half-value width.
比較例１
配向膜４に下記構造式のテトラカルボン酸二無水物成分
とジアミン成分からなるポリ−イミドｌ）を用いた。Comparative Example 1 For the alignment film 4, polyimide 1) consisting of a tetracarboxylic dianhydride component and a diamine component having the following structural formula was used.
−Ｉ＋
（ボリイミＦ’ Ｄの酸二無水物成分）しかし、明瞭な
散乱ピークは認められなかった。-I+ (Acid dianhydride component of Boliimi F'D) However, no clear scattering peak was observed.
このことからポリイミドｌ〕は非品性であることがわか
る。From this, it can be seen that polyimide 1] is of poor quality.
比較例２
配向膜４−に下記構造式のテ］・ラカルボン酸二無水物
成分とジアミン成分からなるポリイミド１Σを用いた。Comparative Example 2 Polyimide 1Σ consisting of a carboxylic dianhydride component and a diamine component having the following structural formula was used for the alignment film 4-.
’Ｉ’ ｌ？ Ｔｌト１きの基板−にに配向膜４とｔノ
でポリイミドＤのポリアミック酸ワニスを塗布し、２５
０°Ｃで焼成してｌ０ＵＯＡ厚に形成した。ラビングに
よる配向処理を行い上記の液晶パネルを作製した。'I' l? A polyamic acid varnish of polyimide D is applied to the substrate with alignment film 4 and 25
It was fired at 0°C and formed to a thickness of 10UOA. The above liquid crystal panel was manufactured by performing alignment treatment by rubbing.
この液晶パネルを６０℃で１００時間連続駆動したとき
のＶｇ（−）を測定し表１に示した。When this liquid crystal panel was continuously driven at 60°C for 100 hours, Vg(-) was measured and shown in Table 1.
またガラス基板６十４に約５０００Ａ厚に形成したポリ
イミドＤの２５０°Ｃ焼成膜のＸ線回折測定を行なった
。In addition, X-ray diffraction measurements were performed on a polyimide D film baked at 250°C formed on a glass substrate 64 to a thickness of about 5000 Å.
（ボリイミＩ’ Ｅの酸二無水物成分）ＴＦ Ｔ １１
４きの基板」二に配向膜４としてポリイミドＥのポリア
ミック酸ワニスを塗布し、２５０°Ｃて焼成して１００
ＯＡ厚に形成した。ラヒンクξこよる配向処理を行い上
記の液晶パネルを作製した。(Acid dianhydride component of Boliimi I'E) TF T 11
A polyamic acid varnish of polyimide E was applied as an alignment film 4 to the substrate 4 and baked at 250°C.
It was formed to have an OA thickness. The above-mentioned liquid crystal panel was manufactured by performing alignment treatment using Rahink ξ.
この液晶パネルを６０°Ｃで１００時間連続駆動したと
きのＶｇ（−）を測定し表１に示した。Vg(-) when this liquid crystal panel was continuously driven at 60° C. for 100 hours was measured and shown in Table 1.
またカラス基板〔５−４二に約５０００ Ａ厚に形成し
たボリイミｌ’ Ｅの２５０℃焼成膜のＸ線回折測定を
行なった。しかし、明瞭な散乱ピークは認められなか−
〕た。このことからポリイミドＥは非品性であることが
わかる。In addition, X-ray diffraction measurements were performed on a film of polyimide I'E formed to a thickness of about 5000 Å on a glass substrate [5-42] and fired at 250°C. However, no clear scattering peak was observed.
〕Ta. This shows that polyimide E is of poor quality.
表１
表２
表１及び表２より部品性ボリイミｌ−を配向膜として用
いた比較例では、Ｖｇ（−）が大きく、ＴＦＴｌのＯＦ
Ｆ特性劣化か大きいことがわかる。Table 1 Table 2 From Tables 1 and 2, in the comparative example in which component polyimide l- was used as the alignment film, Vg(-) was large and the OF of TFTl was
It can be seen that the F characteristic has deteriorated considerably.
方、実施例の結晶性ポリイミドを配向膜として用いた場
合、〜’８（＝）は小さく、１゛Ｆ Ｔ １ （７）
ＯＦ Ｆ特性劣化を非常に小さく抑えることが明かであ
る。On the other hand, when the crystalline polyimide of the example is used as an alignment film, ~'8 (=) is small and 1゛F T 1 (7)
It is clear that the deterioration of the OF characteristic can be suppressed to a very small level.
また、回折面間隔の散乱ピークとしでは、１０八を越え
ると、本発明の結晶性としての意味がほとんとなく、３
Ａを１・回ることは通常者えられない。更に、本発明
の結晶性としで、半値幅はＩＡＧ
以Ｆのものが望ましい。In addition, in terms of the scattering peak of the diffraction plane spacing, if it exceeds 108, there is little meaning in terms of crystallinity according to the present invention, and 3
Normally, it is not possible to go around A once. Furthermore, the crystallinity of the present invention preferably has a half width of IAG or more.
発明の効果
本発明のアクティブマトリックス型液晶装置は、画素ご
とにスイッチンク素子を設ＣＪた基板−１−ｔこ形成さ
れた液晶配向膜を、結晶性ポリイミドとすることで、例
えはＴ Ｐ ＴのＯＦＦ特性劣化を防止し、連続駆動時
の信頼性に優れたアクティブマトリックス型液晶装置を
提供できる。Effects of the Invention The active matrix liquid crystal device of the present invention uses crystalline polyimide as the liquid crystal alignment film formed on the substrate on which a switching element is provided for each pixel. It is possible to provide an active matrix type liquid crystal device that prevents deterioration of the OFF characteristics of the device and has excellent reliability during continuous driving.
第１図は本発明にかかるアクティブマトリックス型液晶
装置の一実施例を示す模式断面図、第２図は同実施例に
用いた液晶パネルの一画素の透過回路図、第３図は同等
価回路図のゲートラインの駆動電圧波形Ｖｇのパルス印
加状態を示すクラブ、第４図は本発明の実施例１に用い
たポリイミドＡのＸ線回折パターンを示すスペクトル図
である。
１・・・Ｔ Ｆ Ｔ、２・・・液晶、３・・・補助客用
、／１・・・配向膜、５・・・透明電極、６・・・ガラ
ス基板。
代理人 弁理士 松 口Ｊ 正 道
１ヌ１FIG. 1 is a schematic cross-sectional view showing one embodiment of an active matrix liquid crystal device according to the present invention, FIG. 2 is a transmission circuit diagram of one pixel of the liquid crystal panel used in the same embodiment, and FIG. 3 is an equivalent circuit. FIG. 4 is a spectrum diagram showing the X-ray diffraction pattern of polyimide A used in Example 1 of the present invention. 1...TFT, 2...Liquid crystal, 3...For auxiliary customers, /1...Alignment film, 5...Transparent electrode, 6...Glass substrate. Agent Patent Attorney J Masaru Matsuguchi Michi1nu1
Claims (3)
ィブマトリックス型液晶装置において、基板上に形成さ
れた液晶配向膜の材料が、結晶性ポリイミドであること
を特徴とするアクティブマトリックス型液晶装置。(1) An active matrix liquid crystal device in which a switching element is provided for each pixel, wherein the material of a liquid crystal alignment film formed on a substrate is crystalline polyimide.
、３〜１０Ａの回折面間隔の散乱ピークを少なくとも一
つ以上有する結晶性ポリイミドであることを特徴とする
請求項１記載のアクティブマトリックス型液晶装置。(2) The active matrix according to claim 1, wherein the material of the liquid crystal alignment film is a crystalline polyimide having at least one scattering peak with a diffraction plane spacing of 3 to 10 A in an X-ray diffraction intensity curve. type liquid crystal device.
、３〜１０Ａの回折面間隔の散乱ピークを少なくとも一
つ以上有し、その半値幅が１Ａ以下の結晶性ポリイミド
であることを特徴とする請求項２記載のアクティブマト
リックス型液晶装置。(3) The material of the liquid crystal alignment film is a crystalline polyimide that has at least one scattering peak with a diffraction plane spacing of 3 to 10 A in an X-ray diffraction intensity curve, and whose half-width is 1 A or less. 3. The active matrix liquid crystal device according to claim 2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16870290A JPH0457028A (en) | 1990-06-27 | 1990-06-27 | Active matrix type liquid crystal device |
| EP19910110537 EP0464623B1 (en) | 1990-06-27 | 1991-06-26 | Ferroelectric liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16870290A JPH0457028A (en) | 1990-06-27 | 1990-06-27 | Active matrix type liquid crystal device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0457028A true JPH0457028A (en) | 1992-02-24 |
Family
ID=15872873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16870290A Pending JPH0457028A (en) | 1990-06-27 | 1990-06-27 | Active matrix type liquid crystal device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0457028A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5579140A (en) * | 1993-04-22 | 1996-11-26 | Sharp Kabushiki Kaisha | Multiple domain liquid crystal display element and a manufacturing method of the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63106624A (en) * | 1986-10-22 | 1988-05-11 | Fujitsu Ltd | Liquid crystal display panel |
| JPH0210323A (en) * | 1988-06-29 | 1990-01-16 | Matsushita Electric Ind Co Ltd | Ferroelectric liquid crystal display element |
| JPH0261615A (en) * | 1988-08-26 | 1990-03-01 | Matsushita Electric Ind Co Ltd | Liquid crystal display element |
-
1990
- 1990-06-27 JP JP16870290A patent/JPH0457028A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63106624A (en) * | 1986-10-22 | 1988-05-11 | Fujitsu Ltd | Liquid crystal display panel |
| JPH0210323A (en) * | 1988-06-29 | 1990-01-16 | Matsushita Electric Ind Co Ltd | Ferroelectric liquid crystal display element |
| JPH0261615A (en) * | 1988-08-26 | 1990-03-01 | Matsushita Electric Ind Co Ltd | Liquid crystal display element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5579140A (en) * | 1993-04-22 | 1996-11-26 | Sharp Kabushiki Kaisha | Multiple domain liquid crystal display element and a manufacturing method of the same |
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