JPH02287318A - Liquid crystal electrooptical device - Google Patents
Liquid crystal electrooptical deviceInfo
- Publication number
- JPH02287318A JPH02287318A JP10857889A JP10857889A JPH02287318A JP H02287318 A JPH02287318 A JP H02287318A JP 10857889 A JP10857889 A JP 10857889A JP 10857889 A JP10857889 A JP 10857889A JP H02287318 A JPH02287318 A JP H02287318A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- display
- invert
- bistability
- impressed
- 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 22
- 239000000758 substrate Substances 0.000 claims abstract description 7
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 claims abstract description 5
- 230000005684 electric field Effects 0.000 claims abstract description 4
- 150000002500 ions Chemical class 0.000 abstract description 2
- 230000010287 polarization Effects 0.000 abstract description 2
- 230000002269 spontaneous effect Effects 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract 1
- 238000010408 sweeping Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 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
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は強誘電性液晶を用いた液晶電気光学装置の保存
方法及び保存回路を組み込んだ液晶電気光学装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preserving a liquid crystal electro-optical device using ferroelectric liquid crystal, and a liquid crystal electro-optical device incorporating a preservation circuit.
近年省スペース、省電力のデイスプレィとじて液晶を用
いたものが盛んに開発されている。中でも高精細デイス
プレィにおいては従来のネマチック液晶を用いたものに
替わるものとして強誘電性液晶を用いたデイスプレィ（
ＦＬＣＤと略記）が開発されつつある。ＦＬＣＤにおい
ては液晶の配向性でＦＬＣＤとしての特性が大きく変わ
る。従来、ポリイミドなどの有機高分子を配向膜に用い
る方法、斜方蒸着を配向膜に用いる方法、シランカツプ
リング剤を配向膜とし液晶封入後通電配向処理する方法
などが考案されてきた。（ナショナルテクニカルレポー
トＶｏ １． ３３ｋｌ Ｆ ｅ ｂ。In recent years, displays using liquid crystals have been actively developed as space-saving and power-saving displays. Among high-definition displays, displays using ferroelectric liquid crystals (
(abbreviated as FLCD) is being developed. In FLCD, the characteristics of the FLCD vary greatly depending on the orientation of the liquid crystal. Conventionally, methods have been devised such as using an organic polymer such as polyimide for the alignment film, using oblique evaporation for the alignment film, and using a silane coupling agent as the alignment film and subjecting the liquid crystal to an energized alignment treatment after encapsulating the liquid crystal. (National Technical Report Vo 1. 33kl F e b.
１９８７、第１４回液晶討論会３Ｂ１２２）〔発明が解
決しようとする課題〕
しかし有機高分子を配向膜に用いる方法では透過率コン
トラスト共に従来のネマチック型には及ばないものであ
り、斜方蒸着法では信頼性が悪い。1987, 14th Liquid Crystal Symposium 3B122) [Problems to be Solved by the Invention] However, in the method of using an organic polymer for the alignment film, both the transmittance contrast and the contrast are not as good as the conventional nematic type, and the oblique evaporation method So reliability is bad.
通電配向法では初期においては問題が無いがしばらく保
存しておくと双安定性が無くなり表示できなくなる課題
があった。そこで本発明は、上記課題を解決するもので
、その目的とするところは通電配向法において、双安定
性が保存される保存法を提供することにある。In the current orientation method, there is no problem in the initial stage, but after storage for a while, bistability is lost and display becomes impossible. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its purpose is to provide a preservation method that preserves bistability in an energized alignment method.
本発明の電気光学装置は、少なくとも一方の基板に配向
処理を施した２枚の電極付き透明基板の間に強誘電性液
晶を封入し電界を印加して配向状態を改善した液晶電気
光学装置において、動作期間外に全画素に表示を反転す
る双極性パルスが印加されることを特徴とする。The electro-optical device of the present invention is a liquid crystal electro-optical device in which a ferroelectric liquid crystal is sealed between two transparent substrates with electrodes, at least one of which has been subjected to an alignment treatment, and the alignment state is improved by applying an electric field. , a bipolar pulse that inverts the display is applied to all pixels outside the operation period.
本発明によれば、表示期間外に表示を反転するパルスが
印加されるため常に液晶のもつ自発分極が反転しそのた
め内部電界による液晶層内のイオンの１方向への掃き寄
せが無くなる。このため双安定性が保持される。According to the present invention, since a pulse for inverting the display is applied outside the display period, the spontaneous polarization of the liquid crystal is always inverted, and therefore the internal electric field does not sweep ions in the liquid crystal layer in one direction. Therefore, bistability is maintained.
実施例１
第１図に本実施例における電気光学装置の断面図を示す
。Example 1 FIG. 1 shows a cross-sectional view of an electro-optical device in this example.
透明電極及びＳｉＯ２絶縁層付きガラス基板に３−アミ
ンプロピルトリエトキシシランの０．２％エタノール溶
液をスピンコードし、窒素下１００℃にて３０分焼成し
た。この基板をエタノールにて洗浄しラビングを施こし
た。ラビング方位がほぼ１８０’ （あるいは０″）
になるように液晶層が約２μｍとなるように組み立てた
。こうして作成したセルに液晶（大日本インキ■製ＤＯ
ＦＯ００４）を封入した。徐冷配向後４０℃にて矩形波
（±３０Ｖ、１５Ｈｚ）を１分間印加し、ラガヴアル等
の時分割駆動波形を印加（１９８５インターナシヨナル
デイスプレイリサーチコンフアレンス予稿集Ｐ２１３参
照）したところ良好に２状態（明、暗）を切り換えるこ
とができた。その後第２図に示した保存波形を印加した
。Ｐｗ−５００μ５Ｔ−２分；波高値±１０ｖとして１
週間印加し続けた。その後再びラガヴアルの波形を印加
したところ良好に駆動できた。比較として保存波形を印
加しなかったものについては片安定となっており駆動で
きなかった。ここでＰｗについては液晶の応答速度以上
であればよく波高値についても同様である。Ｔについて
は５００ｍ秒〜３０分では効果が見られるがこれ以上長
くなると効果が薄れる。またこれ以上短かいと素子が劣
化する。A 0.2% ethanol solution of 3-aminepropyltriethoxysilane was spin-coded onto a glass substrate with a transparent electrode and an SiO2 insulating layer, and baked at 100° C. for 30 minutes under nitrogen. This substrate was washed with ethanol and rubbed. Rubbing direction is approximately 180' (or 0'')
The liquid crystal layer was assembled to have a thickness of approximately 2 μm. A liquid crystal (DO manufactured by Dainippon Ink) is placed on the cell thus created.
FO004) was enclosed. After slow cooling and orientation, a rectangular wave (±30 V, 15 Hz) was applied for 1 minute at 40°C, and a time-division drive waveform such as that of Raghaval was applied (see 1985 International Display Research Conference Proceedings P213), and a good result was obtained. I was able to switch the state (bright, dark). Thereafter, the stored waveform shown in FIG. 2 was applied. Pw-500μ5T-2 minutes; 1 as peak value ±10v
Continued application for weeks. After that, when we applied the Lagavaal waveform again, we were able to drive it well. For comparison, the device to which no storage waveform was applied was monostable and could not be driven. Here, it is sufficient for Pw to be equal to or higher than the response speed of the liquid crystal, and the same applies to the peak value. Regarding T, an effect can be seen between 500 msec and 30 minutes, but the effect weakens when the time is longer than this. Moreover, if it is shorter than this, the element will deteriorate.
実施例２
本実施例では時分割駆動用のくし状電極を設けたマルチ
プレクス用パネルに液晶駆動用のドライバーを実装して
いる場合の保存波形発生法を示す。Embodiment 2 This embodiment shows a storage waveform generation method when a driver for driving a liquid crystal is mounted on a multiplex panel provided with comb-shaped electrodes for time-division driving.
ここで用いたドライバーはコモン用ドライバー５ＥＤ１
７０３Ｔでありセグメント用ドライバー５ＥＤＩ ７０
２Ｔである。ともにセイコーエプソン製である。セグメ
ント側ではＩＮＨ端子を“Ｌｏにしておきｖ２及びＶ、
を１０ｖとしておく。コモン側ではＩＮＨ端子を“Ｌ”
にしておきＶＩ及びｖ４に」３図に示した波形を印加す
る。コモンとセグメントに印加される波形の合成波形と
して第２図に示した波形が得られる。本実施例を用いれ
ば通常の時分割駆動用の装置に対しても応用できる。The driver used here is common driver 5ED1.
703T and segment driver 5EDI 70
It is 2T. Both are made by Seiko Epson. On the segment side, set the INH terminal to “Lo” and connect v2 and V,
is set to 10V. On the common side, set the INH terminal to “L”
Then apply the waveform shown in Figure 3 to VI and v4. The waveform shown in FIG. 2 is obtained as a composite waveform of the waveforms applied to the common and segments. If this embodiment is used, it can also be applied to a normal time-division driving device.
本発明によれば、高透過率高コントラストの液晶電気光
学装置の保存信頼性を高める効果がある。According to the present invention, there is an effect of improving the storage reliability of a liquid crystal electro-optical device having high transmittance and high contrast.
第１図は本発明の実施例における基本断面図である。 第２図は本発明の実施例における保存波形図である。 第３図は実施例２におけるコモン電極波形図である。 １．１０會 ２．９・ 拳 ３．８拳 ・ ４．７拳 ・ ５・ ・ ・ ・ ６・ ・ ・ ・ ・基板 ・電極 ・絶縁層 ・配向層 ・液晶層 嚇スペーサ 以上 出願人 セイコーエプソン株式会社 代理人 弁理士 鈴 木 喜三部（他１名）第２図 に３３図 FIG. 1 is a basic sectional view of an embodiment of the present invention. FIG. 2 is a saved waveform diagram in an embodiment of the present invention. FIG. 3 is a common electrode waveform diagram in Example 2. 1.10 meeting 2.9・Fist 3.8 fists・ 4.7 fist・ 5・・・・・ 6・・・・・ ·substrate ·electrode ・Insulating layer ・Orientation layer ・Liquid crystal layer intimidation spacer that's all Applicant: Seiko Epson Corporation Agent: Patent attorney Kisanbe Suzuki (and 1 other person) Figure 2 Figure 33
Claims (1)
き透明基板の間に強誘電性液晶を封入し電界を印加して
配向状態を改善した液晶電気光学装置において、動作期
間外に全画素に表示を反転する双極性パルスが印加され
ることを特徴とする液晶電気光学装置。In a liquid crystal electro-optical device, in which a ferroelectric liquid crystal is sealed between two transparent substrates with electrodes, at least one of which has been subjected to alignment treatment, and the alignment state is improved by applying an electric field, all pixels are A liquid crystal electro-optical device characterized in that a bipolar pulse is applied to invert a display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10857889A JPH02287318A (en) | 1989-04-27 | 1989-04-27 | Liquid crystal electrooptical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10857889A JPH02287318A (en) | 1989-04-27 | 1989-04-27 | Liquid crystal electrooptical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02287318A true JPH02287318A (en) | 1990-11-27 |
Family
ID=14488368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10857889A Pending JPH02287318A (en) | 1989-04-27 | 1989-04-27 | Liquid crystal electrooptical device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02287318A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006114865A1 (en) * | 2005-04-19 | 2006-11-02 | Fujitsu Limited | Liquid crystal display device and orientation processing method |
-
1989
- 1989-04-27 JP JP10857889A patent/JPH02287318A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006114865A1 (en) * | 2005-04-19 | 2006-11-02 | Fujitsu Limited | Liquid crystal display device and orientation processing method |
| US7821610B2 (en) | 2005-04-19 | 2010-10-26 | Fujitsu Limited | Liquid crystal display device and alignment process method |
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