JPH01296221A - Method of driving ferroelectric liquid crystal panel - Google Patents
Method of driving ferroelectric liquid crystal panelInfo
- Publication number
- JPH01296221A JPH01296221A JP12643188A JP12643188A JPH01296221A JP H01296221 A JPH01296221 A JP H01296221A JP 12643188 A JP12643188 A JP 12643188A JP 12643188 A JP12643188 A JP 12643188A JP H01296221 A JPH01296221 A JP H01296221A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- voltage
- ferroelectric liquid
- scanning electrodes
- scanning
- 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.)
- Granted
Links
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 title claims description 26
- 238000000034 method Methods 0.000 title claims description 11
- 230000005684 electric field Effects 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 44
- 238000010586 diagram Methods 0.000 description 10
- 238000007796 conventional method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- SEGJDCGIQJESDC-MDZDMXLPSA-N 2-methylbutyl (e)-3-phenylprop-2-enoate Chemical compound CCC(C)COC(=O)\C=C\C1=CC=CC=C1 SEGJDCGIQJESDC-MDZDMXLPSA-N 0.000 description 1
- 239000004990 Smectic liquid crystal Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は表示装置や光学的シャッタ等に用いて有効な強
誘電性液晶パネルの駆動方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for driving a ferroelectric liquid crystal panel that is effective for use in display devices, optical shutters, and the like.
従来の技術
近年、コンピュータを中心とする情報機器分野およびテ
レビジョン、ビデオテープレコーダなどを中心とする映
像機器分野において、大画面で薄型の表示装置の需要が
高まっている。この種の表示装置として薄型で低消費電
力という特徴を持つ液晶表示装置が広く利用されている
。2. Description of the Related Art In recent years, there has been an increasing demand for large-screen, thin display devices in the field of information equipment, mainly computers, and in the field of video equipment, mainly televisions, video tape recorders, and the like. As this type of display device, liquid crystal display devices are widely used because they are thin and have low power consumption.
強誘電性液晶パネルは印加する電圧の極性によって、第
１の安定状態か第２の安定状態かのどちらかになり、し
かも、パネル自身がメモリー性を持っているため、時分
割駆動をしても表示品位が低下しないという特徴があり
、近年特に注目されている。A ferroelectric liquid crystal panel can be in either the first stable state or the second stable state depending on the polarity of the applied voltage, and since the panel itself has memory properties, it cannot be driven in time division. It also has the characteristic that display quality does not deteriorate, and has attracted particular attention in recent years.
以下、図面を用いて従来の強誘電性液晶パネルの駆動方
法について説明する。A conventional method for driving a ferroelectric liquid crystal panel will be described below with reference to the drawings.
第３図は液晶パネルの電極を示す概略図で、ｍ行×ｎ列
のドツトマトリクスパネルの例を示している。第３図に
おいて、ＣＩ、Ｃ２，Ｃ３，・・・・・・。FIG. 3 is a schematic diagram showing electrodes of a liquid crystal panel, and shows an example of a dot matrix panel with m rows and n columns. In FIG. 3, CI, C2, C3, . . .
Ｃｎは信号電極、Ｒ１，Ｒ２，Ｒ３，Ｒ８，Ｒ９゜・・
・・・・、Ｒｍは走査電極を示し、信号電極と走査電極
との交点が画素となる。第３図に・おいて、画素３０．
３２はオンの状態を示し、画素３１はオフの状態を示し
ている。Cn is a signal electrode, R1, R2, R3, R8, R9°...
..., Rm indicates a scanning electrode, and the intersection of the signal electrode and the scanning electrode becomes a pixel. In FIG. 3, pixel 30.
32 indicates an on state, and pixel 31 indicates an off state.
第４図は従来の強誘電性液晶パネルの駆動方法を示す走
査ンーケンス図で、縦軸のＲ１，Ｒ２゜・・・・・・、
Ｒｍは走査電極を示し、横軸は時間軸でＴは全走査電極
の走査時間を示している。第４図において、４０は消去
電圧の印加期間で複数本（この例の場合は８本）の走査
電極上の液晶に消去電圧を印加し、液晶を第１の安定状
態にする、４１は書込み電圧の印加期間で、消去電圧の
印加後、順次オンまたはオフの書込み電圧を印加して、
液晶を第２の安定状態に反転させるか、第１の安定状態
に保持する。以下同様の動作を繰り返すことにより、液
晶パネル全面を走査し所望のパターンを表示する。FIG. 4 is a scanning sequence diagram showing the conventional driving method of a ferroelectric liquid crystal panel, and the vertical axis shows R1, R2°...
Rm indicates a scanning electrode, the horizontal axis is a time axis, and T indicates a scanning time of all scanning electrodes. In FIG. 4, 40 is an erasing voltage application period in which an erasing voltage is applied to the liquid crystal on multiple (eight in this example) scanning electrodes to bring the liquid crystal into the first stable state, and 41 is a writing period. During the voltage application period, after applying the erase voltage, apply a write voltage that turns on or off sequentially.
The liquid crystal is inverted to a second stable state or held in a first stable state. Thereafter, similar operations are repeated to scan the entire surface of the liquid crystal panel and display a desired pattern.
第５図は、従来の強誘電性液晶パネルの駆動方法を示す
駆動電圧波形図で、第３図に示される表示パターンを表
示した場合を示している。第５図において、Ｖ（Ｒ１）
〜Ｖ （Ｒ９）は走査電極Ｒ１−Ｒ９の駆動電圧波形を
示し、Ｖ（ＣＩ）〜Ｖ （Ｃ３）は信号電極０１〜Ｃ３
の駆動電圧波形を示し、Ｖ（ＣＩ・Ｒ１）、Ｖ （Ｃ３
・Ｒ９）は画素３０．３２の印加電圧波形を示している
。第５図において、Ｔｒｉ、Ｔｒ２は複数本の走査電極
上の液晶に印加する消去電圧の印加期間を示し、Ｔｓは
オンまたはオフの書込み電圧の印加期間を示している。FIG. 5 is a drive voltage waveform diagram showing a conventional method of driving a ferroelectric liquid crystal panel, and shows a case where the display pattern shown in FIG. 3 is displayed. In Figure 5, V(R1)
~V (R9) indicates the drive voltage waveform of scanning electrodes R1-R9, and V(CI) ~V (C3) represents the signal electrodes 01-C3.
The drive voltage waveform of V(CI・R1), V(C3
-R9) indicates the applied voltage waveform of pixels 30 and 32. In FIG. 5, Tri and Tr2 indicate the application period of the erase voltage applied to the liquid crystal on the plurality of scanning electrodes, and Ts indicates the application period of the ON or OFF write voltage.
第５図において、５０は消去の走査電圧で、走査電極Ｒ
１〜Ｒ８の８本の走査電極に対して同時に印加されてい
る。５３は消去に必要な信号電圧、５６は画素３０に印
加された消去電圧であり、消去期間Ｔｒｉの後半の電圧
により、液晶は第１の安定状態になる。そして、書込み
のための選択走査電圧５１を順次印加し、書込み期間Ｔ
ｓに同期したオンの信号電圧５４を印加して、画素３０
にオンの書込み電圧５７を印加することにより、画素３
０の液晶は書込み期間Ｔｓの後半の電圧で第２の安定状
態に反転し、オンの表示となる。５８はバイアス電圧で
液晶の安定状態は変化しない電圧である。期間Ｔｒ２で
は、走査電極Ｒ９〜Ｒ１６に消去の走査電圧５２を印加
し、上記同様に走査することにより、次の８本の走査電
極についても書込みをすることができ、以下同様の動作
を繰り返すことにより、全走査電極を走査することがで
きる。In FIG. 5, 50 is a scan voltage for erasing, and the scan electrode R
It is simultaneously applied to eight scanning electrodes numbered 1 to R8. 53 is a signal voltage necessary for erasing, 56 is an erasing voltage applied to the pixel 30, and the voltage in the latter half of the erasing period Tri brings the liquid crystal into the first stable state. Then, a selection scanning voltage 51 for writing is applied sequentially, and a writing period T
By applying an on signal voltage 54 synchronized with s, the pixel 30
By applying the ON write voltage 57 to the pixel 3,
The liquid crystal at 0 is inverted to the second stable state by the voltage in the second half of the write period Ts, and is displayed as on. 58 is a bias voltage, which is a voltage that does not change the stable state of the liquid crystal. In the period Tr2, by applying the erasing scan voltage 52 to the scan electrodes R9 to R16 and scanning in the same manner as described above, it is possible to write to the next eight scan electrodes, and the same operation is repeated thereafter. Accordingly, all scanning electrodes can be scanned.
消去電圧、書込み電圧、バイアス電圧は各電圧の印加期
間内で捲性を反転させているが、これは液晶の劣化防止
のために交流駆動をする必要があるからである。尚、５
５のオフの信号電圧を印加すると、液晶の安定状態は変
化せず、画素３１のようにオフの表示となり、所望の表
示パターンを表示することができる（特開昭６２−１７
５７１４号公報に記載されている）。The erasing voltage, writing voltage, and bias voltage have their windings reversed within the application period of each voltage, and this is because alternating current driving is required to prevent deterioration of the liquid crystal. In addition, 5
When the OFF signal voltage of No. 5 is applied, the stable state of the liquid crystal does not change and the display becomes OFF like the pixel 31, and a desired display pattern can be displayed (Japanese Patent Laid-Open No. 62-17
5714).
発明が解決しようとする課題
しかしながら、上記駆動方法では消去期間の終了後、す
ぐに書込み動作を実施しているため、書込み後の液晶の
安定状態が、消去状態と異なる場合の書込み（従来例で
は、オンの書込み）を行うと、安定したオンの書込みが
できないという課題を有していた。Problems to be Solved by the Invention However, in the above driving method, the write operation is performed immediately after the end of the erase period. , ON writing), there was a problem in that stable ON writing could not be performed.
これは、消去電圧の印加により、液晶分子が激しく物理
的に運動するが、この運動の過度現象が無くならない間
に書込み電圧の印加を行うため、液晶分子へ有効な書込
み電界が印加されないからだと考えられる。This is because the application of the erase voltage causes the liquid crystal molecules to physically move violently, but since the write voltage is applied before the transient phenomenon of this movement disappears, an effective write electric field is not applied to the liquid crystal molecules. Conceivable.
本発明は上記課題を解決し、安定した表示を可能にする
強誘電性液晶パネルの駆動方法を提供するものである。The present invention solves the above problems and provides a method for driving a ferroelectric liquid crystal panel that enables stable display.
課題を解決するための手段
上記課題を解決するために本発明の強誘電性液晶パネル
の駆動方法は、複数本の走査電極上の液晶を消去後、書
込みを行うまでに、所定の期間を設けるもので、この期
間を、上記複数本の走査電極より以前に消去された別の
走査電極上の液晶に対する書込み時間に使用するもので
ある。Means for Solving the Problems In order to solve the above problems, the method for driving a ferroelectric liquid crystal panel of the present invention provides a predetermined period of time after erasing the liquid crystal on a plurality of scanning electrodes and before writing. This period is used for writing to the liquid crystal on another scan electrode that was erased before the plurality of scan electrodes.
作用
本発明は、液晶パネルの複数本の走査電極上の液晶に消
去電圧を印加後、この液晶への書込み電圧の印加までに
所定の期間を設けているので、消去電圧の印加による、
液晶分子の運動の過度現象が緩和されてから書込み電圧
が印加されることになり、安定した書込みを実現できる
ものである。Function The present invention provides a predetermined period of time after applying an erase voltage to the liquid crystal on a plurality of scanning electrodes of a liquid crystal panel before applying a write voltage to the liquid crystal.
The writing voltage is applied after the transient phenomenon of the movement of the liquid crystal molecules is alleviated, and stable writing can be realized.
また、液晶パネルに対する消去電圧の印加終了後から書
込み電圧の印加開始までの期間は、別の走査電極上の液
晶に対して、書込み、消去の動作を実行しているため、
全走査電極を走査する時間は従来例と比較して増加する
ことはなく、安定した書込みが可能となる分だけ、逆に
、書込み期間を短くすることができるため、結果的に全
走査時間を短縮することができるものである。In addition, during the period from the end of application of the erase voltage to the liquid crystal panel until the start of application of the write voltage, writing and erasing operations are performed on the liquid crystal on another scan electrode.
The time to scan all scanning electrodes does not increase compared to the conventional example, and the writing period can be shortened by the amount that stable writing is possible.As a result, the total scanning time is reduced. It can be shortened.
実施例
以下、本発明の一実施例の強誘電性液晶パネルの駆動方
法について、図面を参照しながら説明する。EXAMPLE Hereinafter, a method for driving a ferroelectric liquid crystal panel according to an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の強誘電性液晶パネルの駆動
方法を示す走査シーケンス図で、縦軸のＲ１，Ｒ２，・
・・・・・、Ｒｍは走査電極を示し、横軸は時間軸でＴ
は全走査電極の走査時間を示している。第１図において
、１０は消去電圧の印加期間で、まずＲ１−Ｒ８の走査
電極上の液晶に消去電圧を印加し、液晶を第１の安定状
態にする。１１は書込み電圧の印加期間で、次に、走査
電極Ｒｍ−７〜Ｒｍの既に消去電圧の印加された走査電
極上の液晶にオンまたはオフの書込み電圧を順次印加し
ていく、そして、次に走査すべき走査電極Ｒ９〜Ｒ１６
に消去電圧を印加し、その後、走査電極Ｒ１〜Ｒ８に順
次オンまたはオフの書込み電圧を印加して、液晶を第２
の安定状態に反転させるか、第１の安定状態に保持する
。以下同様の動作を繰り返すことにより、液晶パネル全
面を走査し所望のパターンを表示する。FIG. 1 is a scanning sequence diagram showing a method for driving a ferroelectric liquid crystal panel according to an embodiment of the present invention, in which the vertical axis shows R1, R2, .
..., Rm indicates the scanning electrode, and the horizontal axis is the time axis T
indicates the scanning time of all scanning electrodes. In FIG. 1, reference numeral 10 indicates an erasing voltage application period, in which an erasing voltage is first applied to the liquid crystal on the scanning electrodes R1 to R8 to bring the liquid crystal into a first stable state. 11 is a write voltage application period; next, on or off write voltages are sequentially applied to the liquid crystals on the scan electrodes of scan electrodes Rm-7 to Rm to which the erase voltage has already been applied; Scanning electrodes R9 to R16 to be scanned
An erase voltage is applied to the scan electrodes R1 to R8, and then a write voltage of ON or OFF is applied sequentially to the scan electrodes R1 to R8 to turn the liquid crystal into a second state.
or held in the first stable state. Thereafter, similar operations are repeated to scan the entire surface of the liquid crystal panel and display a desired pattern.
第２図は、本発明の一実施例における強誘電性液晶パネ
ルの駆動波形図で、第３図に示される表示パターンを表
示した場合の駆動波形を示している。第２図ニオイテ、
Ｖ （Ｒ１） 〜Ｖ （Ｒ１７）は走査電極Ｒ１〜Ｒ１
７の駆動電圧波形を示し、Ｖ（ＣＩ）〜Ｖ （Ｃ３）は
信号電極０１〜Ｃ３の駆動電圧波形を示し、Ｖ（ＣＩ・
Ｒ１）。FIG. 2 is a diagram of driving waveforms of a ferroelectric liquid crystal panel according to an embodiment of the present invention, and shows the driving waveforms when displaying the display pattern shown in FIG. 3. Figure 2 Nioite,
V (R1) to V (R17) are scanning electrodes R1 to R1
7, V(CI) to V(C3) indicate the drive voltage waveforms of signal electrodes 01 to C3, and V(CI
R1).
Ｖ （Ｃ３・Ｒ９）は画素３０．３２の印加電圧波形を
示している。第２図において、Ｔ ｒ ｌ ＋ Ｔ ｒ
２＋Ｔｒ３は複数本の走査電極上の液晶に印加する消
去電圧の印加期間を示し、Ｔｓはオンまたはオフの書込
み電圧の印加期間を示している。２０は消去の走査電圧
で、走査電ＩＲ１〜Ｒ８の８本の走査電極に対して同時
に印加されている。その後、書込みのための選択走査電
圧２１は走査電極Ｒ９〜Ｒ１６への消去電圧印加後、Ｒ
１−Ｒ８まで順次印加し、同時にオンの信号電圧２４、
またはオフの信号電圧２５を印加する。以上の動作を繰
り返すことで、全走査電極を走査することができる。V (C3·R9) indicates the applied voltage waveform of the pixel 30.32. In Figure 2, T r l + T r
2+Tr3 indicates the application period of the erase voltage applied to the liquid crystal on the plurality of scanning electrodes, and Ts indicates the application period of the ON or OFF write voltage. Reference numeral 20 denotes an erasing scan voltage, which is simultaneously applied to eight scan electrodes of scan voltages IR1 to R8. Thereafter, the selection scan voltage 21 for writing is applied to the scan electrodes R9 to R16 after the erase voltage is applied to the scan electrodes R9 to R16.
The signal voltage 24 is applied sequentially to 1-R8 and turned on at the same time.
Alternatively, an off signal voltage 25 is applied. By repeating the above operations, all scanning electrodes can be scanned.
第２図において、画素３０の印加電圧Ｖ （ＣＩ・Ｒ１
）から明らかなように、消去電圧２６が印加され、消去
期間Ｔｒｉの後半の電圧により、液晶は第１の安定状態
になる。その後、バイアス電圧２８が印加され、液晶は
第１の安定状態を保持し、この間に、液晶分子の運動の
過度現象が緩和される。In FIG. 2, the applied voltage V (CI・R1
), the erase voltage 26 is applied, and the voltage in the second half of the erase period Tri brings the liquid crystal into the first stable state. Thereafter, a bias voltage 28 is applied, and the liquid crystal maintains the first stable state, during which transient phenomena in the motion of the liquid crystal molecules are alleviated.
そして、画素３０にオンの書込み電圧２７が印加され、
期間Ｔｓの後半の電圧により、液晶は第２の安定状態に
反転しオンの表示となる。以下、同様の走査を繰り返す
ことにより、全走査電極を走査することができる。Then, the ON write voltage 27 is applied to the pixel 30,
The voltage in the latter half of the period Ts inverts the liquid crystal to the second stable state, resulting in an ON display. Thereafter, all scanning electrodes can be scanned by repeating similar scanning.
使用できる強誘電性液晶の材料としては、カイラルスメ
クティックＣ相を示す物質〔例えば、＋ｏＯＢＡＭＢＣ
（＋ ｐ−デシルオキシベンジリデン−ｐｏ−アシン２
−メチルブチルシンナメイト）など〕が有り、この種の
材料は電界に対する応答性も速く、液晶パネルにする際
の基板に対する配向性も得やすく、良好な双安定性を示
すものが多いため、この種の物質を用いて液晶パネルを
形成することにより表示均一性の良い、大容量の液晶表
示装置を実現できる。Ferroelectric liquid crystal materials that can be used include substances exhibiting chiral smectic C phase [for example, +oOBAMBC].
(+ p-decyloxybenzylidene-po-acyn 2
-methylbutylcinnamate)], and this type of material has a fast response to electric fields, is easy to obtain orientation with respect to the substrate when making a liquid crystal panel, and many exhibit good bistability. By forming a liquid crystal panel using these materials, a large-capacity liquid crystal display device with good display uniformity can be realized.
なお、本実施例では同時に消去する走査電極を８本とし
たが、これに限られるものではない、また、走査電圧、
信号電圧の各波形もこれに限られず、第り図に示される
走査シーケンスに従って駆動できる波形であれば良い。In this embodiment, the number of scanning electrodes to be erased simultaneously is eight, but the number is not limited to eight.
The waveforms of the signal voltages are not limited to these, but may be any waveform that can be driven according to the scanning sequence shown in FIG.
また、走査シーケンスも、第１図に示されるように、書
込み走査をする複数本の走査電極のブロックは、消去を
したブロックの一つ手前のブロックとなっているが、こ
れも２ブロック以上離れたブロックに対して走査をして
も同様の効果が得られる。Also, in the scanning sequence, as shown in Figure 1, the block of multiple scanning electrodes that performs write scanning is one block before the erased block, but this is also separated by two or more blocks. A similar effect can be obtained by scanning the same block.
発明の効果
以上のように、本発明は強誘電性液晶パネルにおいて、
消去電圧の印加後、書込み電圧の印加開始までに、所定
の期間を設けているため、安定した書込みが可能となり
、しかも、液晶パネルの全走査に必要な時間は、従来と
同等にできるため、コントラストの高い高速の光学的シ
ャ、夕や高品位で大容量の表示装置を実現できるという
効果を得ることができる。Effects of the Invention As described above, the present invention has the following advantages in a ferroelectric liquid crystal panel:
Since a predetermined period is provided between the application of the erase voltage and the start of application of the write voltage, stable writing is possible, and the time required for full scanning of the liquid crystal panel is the same as before. It is possible to achieve the effect of realizing a high-contrast, high-speed optical shutter, high-definition, and large-capacity display device.
さらに、液晶パネルへの書込みの安定性が向上した分だ
け、書込み電圧の印加期間を短縮することができ、結果
的に液晶パネルの全走査時間を短縮できるので、従来よ
りも高速の光学的シャッタや大容量の表示装置を実現で
きる効果もある。Furthermore, as the stability of writing to the liquid crystal panel is improved, the application period of the writing voltage can be shortened, and as a result, the total scanning time of the liquid crystal panel can be shortened, making it possible to use a faster optical shutter than before. It also has the effect of realizing a large-capacity display device.
第１図は本発明の一実施例における強誘電性液晶パネル
の駆動方法を示す走査シーケンス図、第２図は本発明の
一実施例における強誘電性液晶パネルの駆動方法を示す
駆動電圧波形図、第３図は液晶パネルの電極を示す概略
図、第４図は従来の強誘電性液晶パネルの駆動方法を示
す走査シーケンス図、第５図は従来の強誘電性液晶パネ
ルの駆動方法を示す駆動電圧波形図である。
１０．４０・・・・・・消去電圧印加期間、１１．４１
・・・・・・書込み電圧印加期間、３０．３２・・・・
・・オン画素、３１・・・・・・オフ画素、２６・・・
・・・消去電圧、２７・・・・・・オンの書込み電圧、
Ｒ１，Ｒ２，−、Ｒｍ・・・・・・走査電極、ＣＩ、Ｃ
２，Ｃ３・・・・・・信号電極、Ｔｒｉ、Ｔｒ２．Ｔｒ
３・・・・・・消去電圧印加期間、Ｔｓ・・・・・・書
込み電圧印加期間。
代理人の氏名 弁理士 中尾敏男 ほか１名１０−
清夫電圧印力期聞
１１− 書ｔ２．ａｔ圧ｔｌｌ Ｘｉ 期ＭＲ１〜胸
−走査ｆ看
Ｔ−−一全定ｊ１期間
第１図
第２図
凪望−ＯＮ 画素
３１ −・−ＯＦＦ 画 稟
Ｒ１−庵一走査電板
第３図 Ｃｌ＝Ｃｎ−信号電ｉ第４図FIG. 1 is a scanning sequence diagram showing a method for driving a ferroelectric liquid crystal panel in an embodiment of the present invention, and FIG. 2 is a drive voltage waveform diagram showing a method for driving a ferroelectric liquid crystal panel in an embodiment of the present invention. , Fig. 3 is a schematic diagram showing the electrodes of a liquid crystal panel, Fig. 4 is a scanning sequence diagram showing a conventional method of driving a ferroelectric liquid crystal panel, and Fig. 5 shows a conventional method of driving a ferroelectric liquid crystal panel. It is a drive voltage waveform diagram. 10.40...Erasing voltage application period, 11.41
...Write voltage application period, 30.32...
...On pixel, 31...Off pixel, 26...
... Erase voltage, 27... Write voltage on,
R1, R2, -, Rm...Scanning electrode, CI, C
2, C3...signal electrode, Tri, Tr2. Tr
3... Erase voltage application period, Ts... Write voltage application period. Name of agent: Patent attorney Toshio Nakao and 1 other person 10-
Kiyoo Voltage Input Period 11- Book t2. at pressure tll Xi period MR1~chest-scan fview T--one complete j1 period Fig. 2 Calm - ON Pixel 31 -・-OFF image R1 - Anichi Scanning plate Fig. 3 Cl= Cn-signal electric i Fig. 4
Claims (1)
性を有する強誘電性液晶を配置した強誘電性液晶パネル
であって、上記強誘電性液晶を第１の安定状態にする消
去電圧と、上記強誘電性液晶を第２の安定状態にするオ
ンの書込み電圧または第１の安定状態に保持するオフの
書込み電圧とを具備し、上記強誘電性液晶パネルの複数
本の走査電極上の強誘電性液晶へ消去電圧を印加後、上
記複数本の走査電極に対して時系列的に前に消去電圧が
印加された別の複数本の走査電極上の強誘電性液晶には
線順次走査によりオンまたはオフの書込み電圧を順次印
加し、上記複数本の走査電極に対して時系列的に後に走
査すべき別の複数本の走査電極上の強誘電性液晶には消
去電圧を印加するという一連の動作を、走査電極総てに
対して順次繰り返し実行することを特徴とする強誘電性
液晶パネルの駆動方法。A ferroelectric liquid crystal panel in which a ferroelectric liquid crystal having bistability with respect to an electric field is arranged between a scanning electrode group and a signal electrode group, the ferroelectric liquid crystal being brought into a first stable state. an erase voltage and an on-write voltage for bringing the ferroelectric liquid crystal into a second stable state or an off-writing voltage for keeping the ferroelectric liquid crystal in the first stable state; After applying an erase voltage to the ferroelectric liquid crystal on the electrode, the erase voltage is applied to the ferroelectric liquid crystal on another plurality of scanning electrodes to which the erasing voltage was applied chronologically earlier to the plurality of scanning electrodes. A writing voltage of ON or OFF is applied sequentially by line sequential scanning, and an erasing voltage is applied to the ferroelectric liquid crystal on another plurality of scanning electrodes that are to be scanned chronologically later than the plurality of scanning electrodes. 1. A method for driving a ferroelectric liquid crystal panel, characterized in that a series of operations of applying voltage is repeatedly executed to all scanning electrodes in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12643188A JP2502677B2 (en) | 1988-05-24 | 1988-05-24 | Driving method for ferroelectric liquid crystal panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12643188A JP2502677B2 (en) | 1988-05-24 | 1988-05-24 | Driving method for ferroelectric liquid crystal panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01296221A true JPH01296221A (en) | 1989-11-29 |
| JP2502677B2 JP2502677B2 (en) | 1996-05-29 |
Family
ID=14935024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12643188A Expired - Fee Related JP2502677B2 (en) | 1988-05-24 | 1988-05-24 | Driving method for ferroelectric liquid crystal panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2502677B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002328654A (en) * | 2001-04-27 | 2002-11-15 | Matsushita Electric Ind Co Ltd | Driving method for liquid crystal display |
| JP2004046236A (en) * | 2003-09-05 | 2004-02-12 | Matsushita Electric Ind Co Ltd | Driving method for liquid crystal display device |
| US6989812B2 (en) | 2001-02-05 | 2006-01-24 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal display unit and driving method therefor |
| CN113284471A (en) * | 2021-06-28 | 2021-08-20 | 山东蓝贝思特教装集团股份有限公司 | Local erasing control method and system for liquid crystal writing device based on illumination erasing |
-
1988
- 1988-05-24 JP JP12643188A patent/JP2502677B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6989812B2 (en) | 2001-02-05 | 2006-01-24 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal display unit and driving method therefor |
| US7450101B2 (en) | 2001-02-05 | 2008-11-11 | Panasonic Corporation | Liquid crystal display unit and driving method therefor |
| JP2002328654A (en) * | 2001-04-27 | 2002-11-15 | Matsushita Electric Ind Co Ltd | Driving method for liquid crystal display |
| JP2004046236A (en) * | 2003-09-05 | 2004-02-12 | Matsushita Electric Ind Co Ltd | Driving method for liquid crystal display device |
| CN113284471A (en) * | 2021-06-28 | 2021-08-20 | 山东蓝贝思特教装集团股份有限公司 | Local erasing control method and system for liquid crystal writing device based on illumination erasing |
| CN113284471B (en) * | 2021-06-28 | 2022-09-02 | 山东蓝贝思特教装集团股份有限公司 | Local erasing control method and system for liquid crystal writing device based on illumination erasing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2502677B2 (en) | 1996-05-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4317115A (en) | Driving device for matrix-type display panel using guest-host type phase transition liquid crystal | |
| US5182549A (en) | Liquid crystal apparatus | |
| US5092665A (en) | Driving method for ferroelectric liquid crystal optical modulation device using an auxiliary signal to prevent inversion | |
| US4380008A (en) | Method of driving a matrix type phase transition liquid crystal display device to obtain a holding effect and improved response time for the erasing operation | |
| US4697887A (en) | Liquid crystal device and method for driving the same using ferroelectric liquid crystal and FET's | |
| JPS6238709B2 (en) | ||
| US5296953A (en) | Driving method for ferro-electric liquid crystal optical modulation device | |
| US5796380A (en) | Liquid crystal apparatus and method of driving same | |
| US5124820A (en) | Liquid crystal apparatus | |
| US5717419A (en) | Method for driving optical modulation device | |
| JPS6167836A (en) | Driving method of liquid crystal element | |
| JPH03109524A (en) | Driving method for display panel and display device | |
| JPH01296221A (en) | Method of driving ferroelectric liquid crystal panel | |
| JP3302752B2 (en) | Driving method of antiferroelectric liquid crystal panel | |
| JPH02163725A (en) | Ferroelectric liquid crystal display device | |
| JP2637517B2 (en) | Liquid crystal device | |
| JPS6275516A (en) | Driving method for optical modulation switch | |
| JP2575196B2 (en) | Driving method of display device | |
| US5757350A (en) | Driving method for optical modulation device | |
| JPS63259516A (en) | Method for driving matrix type liquid crystal display body | |
| JPS62246013A (en) | Driving method for ferroelectric liquid crystal panel | |
| JPS6228716A (en) | Liquid crystal device and its driving method | |
| JPH022510A (en) | Driving method for ferroelectric liquid crystal panel | |
| JPS63138316A (en) | Liquid crystal display method | |
| JPH0588646A (en) | Matrix driving method for plane type display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |