JPS63172122A - Field effect type liquid crystal display element - Google Patents
Field effect type liquid crystal display elementInfo
- Publication number
- JPS63172122A JPS63172122A JP350287A JP350287A JPS63172122A JP S63172122 A JPS63172122 A JP S63172122A JP 350287 A JP350287 A JP 350287A JP 350287 A JP350287 A JP 350287A JP S63172122 A JPS63172122 A JP S63172122A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- flickering
- display element
- film
- 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 45
- 230000005669 field effect Effects 0.000 title claims description 11
- 229920001721 polyimide Polymers 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000004642 Polyimide Substances 0.000 claims abstract description 12
- 238000009825 accumulation Methods 0.000 abstract description 2
- 229920005575 poly(amic acid) Polymers 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000010408 film Substances 0.000 description 25
- 238000011156 evaluation Methods 0.000 description 11
- 238000002834 transmittance Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000009719 polyimide resin Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polyoxyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電気光学的な液晶ディスプレイに用いられる液
晶表示素子、更に詳しくはｅ ｏ Ｈｚ以下の低周波数
、駆動を行う液晶表示素子に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid crystal display element used in an electro-optical liquid crystal display, and more particularly to a liquid crystal display element that is driven at a low frequency of e o Hz or less.
従来の技術
電界効果型液晶表示素子における配向膜には、化学的安
定性、熱的安定性のほか、電極から液晶層中への電荷の
注入を少なくし素子の信頼性を上げるため、液晶材料の
電気絶縁性に比べて充分高い電気絶縁性が求められてお
り、ポリオキシエチレン、ポリイミド、ポリアミドやア
セチレンのプラズマ重合膜などの薄膜、および二酸化ケ
イ素の斜方蒸着膜などが適格な材料として知られている
。Conventional technology In addition to chemical stability and thermal stability, the alignment film in field-effect liquid crystal display elements is made of liquid crystal material in order to reduce the injection of charge from the electrodes into the liquid crystal layer and increase the reliability of the element. There is a need for electrical insulation properties that are sufficiently high compared to those of other materials, and thin films such as plasma polymerized films of polyoxyethylene, polyimide, polyamide, and acetylene, and obliquely vapor-deposited films of silicon dioxide are known as suitable materials. It is being
なかでもポリイミドは化学的安定性、量産性、コストの
点で優れており、半導体のパッシベーション膜としての
実績もあることより、大部分の液晶表示素子に用いられ
てきている。Among them, polyimide is superior in terms of chemical stability, mass productivity, and cost, and has a proven track record as a passivation film for semiconductors, so it has been used in most liquid crystal display elements.
通常の交流駆動では、印加電界の極性反転時に液晶層に
は所定の実効電圧が印加されるものの、次の極性反転時
（３０１−ｌｘ駆動の場合には１６．６ｍｇ後）までに
液晶層にかかる実効電圧は低下してしまう。そのため、
液晶表示素子の光透過率は駆動周波数の２倍の周波数で
もって変化する。In normal AC driving, a predetermined effective voltage is applied to the liquid crystal layer when the polarity of the applied electric field is reversed; This effective voltage will drop. Therefore,
The light transmittance of a liquid crystal display element changes at a frequency twice the driving frequency.
発明が解決しようとする問題点
しかしながら、実際の液晶表示素子の透過光には１．駆
動周波数の２倍の周波数の光成分のみならず１、駆動周
波数と同一の周波数の光成分をも含んでいる。特に、６
０〜６０−未満の低周波数で駆動する場合には、この光
透過率の周期的変動は人間の眼にはちらつき（フリッカ
）として認識され、表示される画像の品質を著しく低下
させる。上記問題点を解決する方法としては、■１画素
を二つに分け、それぞれに同じ大きさでかつ反対極性の
電圧を印加し、見かけ上フリッカを相殺する方法や、■
液晶材料の改良によりフリッカを少なくする方法（宍田
ほか、昭和６９年０電気関係学会関西支部連合大会Ｇ９
−１ｓ）などが行われている。Problems to be Solved by the Invention However, the transmitted light of an actual liquid crystal display element has 1. It includes not only an optical component with a frequency twice the driving frequency, but also an optical component with the same frequency as the driving frequency. In particular, 6
When driven at a low frequency of less than 0 to 60 -, this periodic variation in light transmittance is perceived by the human eye as flicker, significantly reducing the quality of the displayed image. Methods to solve the above problems include (1) dividing one pixel into two and applying voltages of the same magnitude and opposite polarity to each to cancel out the apparent flicker;
Method for reducing flicker by improving liquid crystal materials (Shishida et al., 1986 0 Electrical Association Kansai Branch Conference G9
-1s) etc. are being carried out.
しかしながら前者の方法は新たな駆動用ＩＣが必要であ
り、コストアップとともに消費電力量の増大をもたらす
。一方、後者の液晶材料から解決しようとする試みは、
必ずしもすべてのフリッカ現象に有効ではなく、優れた
電気光学特性を出すための液晶材料の選択範囲を大幅に
狭めることにもなり実用的ではない。However, the former method requires a new driving IC, which increases the cost and power consumption. On the other hand, attempts to solve the latter problem using liquid crystal materials,
This method is not necessarily effective against all flicker phenomena, and it is not practical because it greatly narrows down the selection range of liquid crystal materials for achieving excellent electro-optical characteristics.
また、このような駆動周波数と同一周期のフリッカは、
液晶に加わる実効電圧が十電圧と一電圧で同じになるよ
うに駆動電圧を調整し、最適駆動電圧に設定することで
、ある程度低減できる。しかし、温度が変化すると最適
駆動電圧も変化する場合が多く、一般に、液晶の応答速
度が速まるのとあいまって、温度の上昇にともないフリ
ッカが増大する。In addition, flicker with the same period as the driving frequency is
This can be reduced to some extent by adjusting the drive voltage so that the effective voltage applied to the liquid crystal is the same for 10 voltages and 1 voltage, and setting it to the optimum drive voltage. However, as the temperature changes, the optimum drive voltage often changes, and in general, flicker increases as the temperature rises, along with the faster response speed of the liquid crystal.
問題点を解決するだめの手段
少なくとも、その表面がポリイミド配向膜でおおわれた
電極を有する２枚の基板と、前記基板間に挾持された液
晶層とからなる電界効果型液晶表示素子において、前記
ポリイミド配向膜のイミド化率が４０％以上、８ｏ％以
下であることを特徴とする電界効果型液晶表示素子を用
いる。Means for Solving the Problems In a field effect liquid crystal display element comprising at least two substrates having electrodes whose surfaces are covered with a polyimide alignment film, and a liquid crystal layer sandwiched between the substrates, the polyimide A field effect liquid crystal display element is used, which is characterized in that the imidization rate of the alignment film is 40% or more and 8o% or less.
作 用
駆動周波数と同一の周期で光透過率が変化するというこ
とは、液晶層に印加される電圧の極性により光透過率が
変化することを意味している。即ち、この現象は液晶層
に加わる実効電圧が十の電圧と−の電圧とで異なること
を意味し７ている。各誘電体層にかかる実効電圧は、電
界極性反転時には各誘電体層の容量に応じて加わるが、
時間の経過とともに各誘電体層にかかる実効電圧の比は
各誘電体層の電気抵抗の比に等しくなるように変化する
。しかし、界面分極やイオン移動等にともなう空間電荷
層の形成や電荷注入などが起こると現象は複雑となる。The fact that the light transmittance changes with the same period as the operating driving frequency means that the light transmittance changes depending on the polarity of the voltage applied to the liquid crystal layer. That is, this phenomenon means that the effective voltage applied to the liquid crystal layer is different between a voltage of 10 and a voltage of -. The effective voltage applied to each dielectric layer is applied according to the capacitance of each dielectric layer when the electric field polarity is reversed.
Over time, the ratio of effective voltages applied to each dielectric layer changes to become equal to the ratio of electrical resistances of each dielectric layer. However, the phenomenon becomes complicated when a space charge layer is formed or charge injection occurs due to interfacial polarization, ion movement, etc.
これらの現象に上下基板間でアンバランスが生じると、
液晶素子の一方の基板上と他方の基板上で蓄積される電
荷量が異なシ、液晶層に加わる実効電圧が極性によって
異なることとなり、フリッカの原因となる。また、素子
の温度が上昇すると、液晶の粘度の低下にともなって、
液晶の応答速度が速くなるために、液晶層に加わる実効
電圧の極性によるアンバランスは、低温時に比べて、よ
り大きなフリッカとして現われる。If an imbalance occurs between the upper and lower boards due to these phenomena,
Since the amount of charge accumulated on one substrate of the liquid crystal element differs from that on the other substrate, the effective voltage applied to the liquid crystal layer differs depending on the polarity, which causes flicker. Additionally, as the temperature of the element increases, the viscosity of the liquid crystal decreases,
Because the response speed of the liquid crystal becomes faster, imbalance due to the polarity of the effective voltage applied to the liquid crystal layer appears as larger flicker than at low temperatures.
本発明液晶素子のフリッカが何故少ないかは明らかでは
ないが、配向膜のイミド化率が８ｏ％以下であり、膜中
にポリアミド酸が残っていることから、液晶−配向膜界
面での電荷蓄積が起こりにくいことや、イミド化率が１
ｏｏ％に近い膜に比べて抵抗が低く、膜自体にも電荷が
蓄積しにくいために、フリッカが非常に少なく、温度上
昇時にもフリッカが増大しないと考えられる。It is not clear why the flicker of the liquid crystal element of the present invention is low, but since the imidization rate of the alignment film is less than 8o% and polyamic acid remains in the film, charge accumulation at the interface between the liquid crystal and the alignment film is unlikely to occur, and the imidization rate is 1.
Since the resistance is lower than that of a film close to 0.0%, and it is difficult for charges to accumulate in the film itself, there is very little flicker, and it is thought that flicker does not increase even when the temperature rises.
実施例
平均透過光強度
本実施例では駆動波形をｆ＝３ｏｈ、矩形波とし、液晶
表示素子の光透過率をｓｏ％変化させるのに要する電圧
■６０を印加してｍ値を測定した。透過光変動の３０円
成分はスペクトラム・アナライザ（アトパンテスト（株
）製Ｔ Ｒ−９４０６）にて分離した。また、イミド化
率はニコレー社製ＦＴ−ＩＲスペクトロフォトメータ６
ｏＳＸを用い、配向膜中のＣＯ伸縮振動に基づく吸収の
大きさを測定し算出した。この時、３５０″Ｃにて１時
間硬化したポリイミド配向膜のイミド化率を１００％と
仮定した。Example Average Transmitted Light Intensity In this example, the drive waveform was set to f=3oh and a rectangular wave, and the m value was measured by applying a voltage of 60 required to change the light transmittance of the liquid crystal display element by so%. The 30-yen component of the transmitted light fluctuation was separated using a spectrum analyzer (TR-9406 manufactured by Atopan Test Co., Ltd.). In addition, the imidization rate was measured using a Nikolay FT-IR spectrophotometer 6.
Using oSX, the magnitude of absorption based on CO stretching vibration in the alignment film was measured and calculated. At this time, it was assumed that the imidization rate of the polyimide alignment film cured at 350''C for 1 hour was 100%.
フリッカが感じられるレベルは個人差も大きいが、３０
Ｈｚの場合、輝度変調度ｍ （０、０１では殆どの場合
フリッカは認識されない。The level at which flicker can be felt varies greatly from person to person, but
In the case of Hz, flicker is not recognized in most cases when the brightness modulation degree m (0, 01).
以下に本発明の実施の態様を図面を参照しつつ詳細に説
明する。Embodiments of the present invention will be described in detail below with reference to the drawings.
〈実施例１〉
第１図に示される構成を有するＴＮ型液晶表示特性評価
セルを作成した。配向膜３，４として日立化成製ポリイ
ミド樹脂Ｐ Ｉ Ｑ （４，６ｗｔ％、ＮＭＰ溶液）を
ＩＴＯ電極２．８を有するガラス基板１．９上に硬化後
の膜厚が１０００人となるようスピンコード法により塗
布した。その後、塗布したポリイミド樹脂を窒素気流中
１２０〜３００°Ｃの温度で２時間硬化させ、イミド化
率の異なる配向膜を有する基板を作成した。第２図はこ
の時の配向膜の硬化温度とイミド化率との関係を表した
ものである。<Example 1> A TN type liquid crystal display characteristic evaluation cell having the configuration shown in FIG. 1 was created. As alignment films 3 and 4, polyimide resin P I Q (4.6 wt%, NMP solution) manufactured by Hitachi Chemical was spun onto a glass substrate 1.9 having an ITO electrode 2.8 so that the film thickness after curing was 1000 nm. It was applied using the cord method. Thereafter, the applied polyimide resin was cured in a nitrogen stream at a temperature of 120 to 300° C. for 2 hours to produce substrates having alignment films with different imidization rates. FIG. 2 shows the relationship between the curing temperature of the alignment film and the imidization rate at this time.
次に、作成したガラス基板を常法に従い、５．０μｍガ
ラスファイバ製スペーサ６を介して貼り合わせ、メルク
社製液晶ＺＬ Ｉ −１５６６を減圧注入し、エポキシ
愼脂により注入口を封止し、偏光板をノーマリブラック
モードで貼り評価セルＡ、Ｂ。Next, the prepared glass substrates were bonded together via a 5.0 μm glass fiber spacer 6 according to a conventional method, liquid crystal ZL I-1566 manufactured by Merck & Co. was injected under reduced pressure, and the injection port was sealed with epoxy resin. Evaluation cells A and B with polarizing plates pasted in normally black mode.
Ｃ，Ｄ、Ｅを作成したへ表１は各評価セル中の配向膜の
イミド化率を表している。Table 1 shows the imidization rate of the alignment film in each evaluation cell.
表 １
次にキャノン社製液晶評価装置を用いて、２０°Ｃで各
素子の電圧−透過率特性を測定し、光透過率が６０％変
化するのに要する電圧ｖ５ｏを求めた。そして、前述の
方法により３ｏ−の輝度変調度ｍを測定し、結果を表２
に示した。尚、評価セルＡは、評価セル作成中のラビン
グ処理により、膜のはく離が起こり、評価することがで
きなかった。膜の接着強度や硬度、素子の信頼性の点か
ら、イミド化率は少なくとも４０チ以上であることが必
要であシ、製造工程の歩留シを考えれば、イミド化率は
５０％以上であることが好ましい。Table 1 Next, the voltage-transmittance characteristics of each element were measured at 20° C. using a Canon liquid crystal evaluation device, and the voltage v5o required for a 60% change in light transmittance was determined. Then, the luminance modulation degree m of 3o- was measured using the method described above, and the results are shown in Table 2.
It was shown to. In addition, evaluation cell A could not be evaluated because the film peeled off due to the rubbing treatment during the preparation of the evaluation cell. From the point of view of the adhesive strength and hardness of the film and the reliability of the device, the imidization rate must be at least 40%, and considering the yield of the manufacturing process, the imidization rate must be 50% or more. It is preferable that there be.
表 ２
表２より、配向膜のイミド化率がｓｏ％以下の評価セル
Ｂ、Ｃ，Ｄは、１ｏｏ％イミド化が進んだ配向膜を用い
たセルＥと比較してｍ値が小さいことが分かる。この結
果より、配向膜のイミド化率は、４０％〜８０％、とく
に６０％付近が、フリッカの点で最も良い特性を与える
。Table 2 From Table 2, evaluation cells B, C, and D, in which the imidization rate of the alignment film is less than so%, have smaller m values than cell E, which uses an alignment film that has been imidized by 10%. I understand. From this result, the imidization rate of the alignment film is 40% to 80%, particularly around 60%, giving the best characteristics in terms of flicker.
〈実施例２〉
実施例１には、評価セルの上下基板に対称な３゜庵の矩
形波を印加した場合の例であった。３０−のフリッカは
、前述したように、液晶層に加わる実効電圧の極性によ
るアンバランスによると考えられる。一方の基板にバイ
アス電圧を加えることで、液晶層に加わる実効電圧のア
ンバランスを小さくし、フリッカを低減させることがで
きる。そこで、実施例１で用いた評価セルＢ、Ｈについ
て、各々適当なバイアス電圧を加えることにより、２０
°Ｃでのｖ５゜におけるｍ値が最少となるように調整し
た。バイアス電圧はセルにより異なるが、５ｍＶから１
７０ｍＶの範囲であった。<Example 2> Example 1 was an example in which symmetrical 3° rectangular waves were applied to the upper and lower substrates of the evaluation cell. The flicker of 30- is considered to be due to the unbalance due to the polarity of the effective voltage applied to the liquid crystal layer, as described above. By applying a bias voltage to one of the substrates, it is possible to reduce the unbalance of the effective voltage applied to the liquid crystal layer and reduce flicker. Therefore, by applying appropriate bias voltages to evaluation cells B and H used in Example 1, 20
The m value at v5° at °C was adjusted to be the minimum. The bias voltage varies depending on the cell, but it ranges from 5 mV to 1
It was in the range of 70 mV.
次に、駆動電圧、バイアス電圧を一定に保ったまま、セ
ルの温度を６０″Ｃに上げてｍ値の変化を調べた。２０
″Ｃと６０°Ｃにおける各評価セルのｍ値を表３に示し
た。Next, while keeping the drive voltage and bias voltage constant, the cell temperature was raised to 60"C and changes in the m value were investigated.20
Table 3 shows the m values of each evaluation cell at 60°C and 60°C.
表 ３
表３より、２０°Ｃではバイアス電圧を加えることによ
り、いずれのセルもｍ値を低いレベルに押えることがで
きることが分かる。しかし、６０°Ｃに温度を上げると
、イミド化率１００チのセルＥは、他のセルに比べてｍ
値の増加が大きい。Table 3 From Table 3, it can be seen that at 20° C., by applying a bias voltage, the m value can be suppressed to a low level in any cell. However, when the temperature is raised to 60°C, cell E with an imidization rate of 100% has m
The increase in value is large.
表３から明らかなように、セルＢ、Ｃ，Ｄは温度が上昇
したときのフリッカの増加が少ない。素子の実際の使用
においては、バックライトの使用や使用環境の温度変化
によシ、温度上昇が起こるため、温度上昇にともなって
フリッカが増加しないことは、実用上、大きな利点であ
る。とくに、イミド化率が約６０％のポリイミド膜を用
いた電界効果型液晶表示素子は、温度上昇にともなうフ
リッカの増加が非常に小さく、低周波で、駆動するアク
ティブマトリクス型液晶表示素子に用いた場合その実用
価値は極めて高い。As is clear from Table 3, cells B, C, and D show little increase in flicker when the temperature rises. In actual use of the device, the temperature rises due to the use of a backlight and temperature changes in the usage environment, so it is a great practical advantage that flicker does not increase as the temperature rises. In particular, field-effect liquid crystal display elements using a polyimide film with an imidization rate of about 60% have a very small increase in flicker as the temperature rises, and are suitable for use in active matrix liquid crystal display elements driven at low frequencies. In this case, its practical value is extremely high.
発明の効果
以上述べたように、本発明の電界効果型液晶表示素子は
、駆動周波数と同一の周波数で変化する素子の光透過率
の変化（フリッカ）を著しく小さくし、かつ、温度が上
昇しても、フリッカが増加しないため、画像の表示品質
が良く、その実用的価値は非常に高い。Effects of the Invention As described above, the field-effect liquid crystal display element of the present invention significantly reduces the change in light transmittance (flicker) of the element that changes at the same frequency as the driving frequency, and also reduces temperature rise. However, since there is no increase in flicker, the display quality of images is good, and its practical value is very high.
第１図は本発明の一実施例である表示特性評価セルの構
成を説明するだめの断面図、第２図は配向膜の硬化温度
とイミド化率との関係を表しだグラフ−である。
１．９・・・・・・ガラス基板、２，８・・・・・・Ｉ
ＴＯ電極、３．４・・・・・・配向膜、６・・・・・・
シール樹脂、６・・・・・・ガラスファイバスペーサ、
７・・・・・・液晶。FIG. 1 is a cross-sectional view illustrating the structure of a display characteristic evaluation cell according to an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the curing temperature of the alignment film and the imidization rate. 1.9...Glass substrate, 2,8...I
TO electrode, 3.4...Alignment film, 6...
Seal resin, 6...Glass fiber spacer,
7...LCD.
Claims (3)
われた電極を有する２枚の基板と、前記基板間に挾持さ
れた液晶層とからなる電界効果型液晶表示素子において
、前記ポリイミド配向膜のイミド化率が４０％以上、８
０％以下であることを特徴とする電界効果型液晶表示素
子。(1) In a field effect liquid crystal display element consisting of at least two substrates having electrodes whose surfaces are covered with a polyimide alignment film and a liquid crystal layer sandwiched between the substrates, the polyimide alignment film is imidized. Rate is 40% or more, 8
A field-effect liquid crystal display element characterized in that the field-effect liquid crystal display element is 0% or less.
とを特徴とする特許請求の範囲第１項に記載の電界効果
型液晶表示素子。(2) The field-effect liquid crystal display device according to claim 1, wherein the polyimide alignment film is a thermally condensed polyimide.
ることを特徴とする特許請求の範囲第２項に記載の電界
効果型液晶表示素子。(3) The field-effect liquid crystal display device according to claim 2, wherein the imidization rate of the polyimide alignment film is approximately 60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP350287A JPS63172122A (en) | 1987-01-09 | 1987-01-09 | Field effect type liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP350287A JPS63172122A (en) | 1987-01-09 | 1987-01-09 | Field effect type liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63172122A true JPS63172122A (en) | 1988-07-15 |
Family
ID=11559128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP350287A Pending JPS63172122A (en) | 1987-01-09 | 1987-01-09 | Field effect type liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63172122A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6424227A (en) * | 1987-07-20 | 1989-01-26 | Sanyo Electric Co | Liquid crystal display device |
-
1987
- 1987-01-09 JP JP350287A patent/JPS63172122A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6424227A (en) * | 1987-07-20 | 1989-01-26 | Sanyo Electric Co | Liquid crystal display device |
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