JPS62175714A - Operation system of matrix type ferroelectric liquid crystal panel - Google Patents

Operation system of matrix type ferroelectric liquid crystal panel

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Publication number
JPS62175714A
JPS62175714A JP1682186A JP1682186A JPS62175714A JP S62175714 A JPS62175714 A JP S62175714A JP 1682186 A JP1682186 A JP 1682186A JP 1682186 A JP1682186 A JP 1682186A JP S62175714 A JPS62175714 A JP S62175714A
Authority
JP
Japan
Prior art keywords
liquid crystal
white
black
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.)
Pending
Application number
JP1682186A
Other languages
Japanese (ja)
Inventor
Hiroo Hori
堀 浩雄
Yasushi Shimizu
簡 清水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP1682186A priority Critical patent/JPS62175714A/en
Publication of JPS62175714A publication Critical patent/JPS62175714A/en
Pending legal-status Critical Current

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  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE:To shorten the writing time of one picture and to perform faster display operation by perform erasing operation for a part corresponding to plural scanning electrodes before information is written and displaying the information in black or white as one color of binary display. CONSTITUTION:A voltage is impressed between plural scanning electrodes 20 and a signal electrode 22 at the same time and dipoles of liquid crystal molecules between them are all oriented in one direction to enter a white or black erasure state. Then, those plural scanning electrodes 20 are scanned, one by one, in order to apply an information signal voltage synchronized with the scanning to the signal electrode 22, and the direction is inverted according to an information signal indicating the direction of bipoles to make a black or white display, thereby placing plural scanning electrodes in a display state. Then, plural following scanning electrodes 20 are put in the same operation to put all scanning electrodes 20 in this operation, thereby displaying one image plane.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明は文字や図形等を例えば白黒の2値信号で表示す
るマトリクス形強誘電性液晶パネルの動作方式に関する
DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to an operating system of a matrix type ferroelectric liquid crystal panel that displays characters, figures, etc. using, for example, black and white binary signals.

(従来の技術) マトリクス形強誘電性液晶パネルは、数μm程度の厚さ
の例えばスメクチックC相の強誘電性液晶層と、これを
はさんで向かい合い外囲器となるガラス板と、その内面
に形成され、互いにおおよそ直交するすだれ状の透明な
走査電極と透明な信号電極と、外囲器の外側に配置され
た偏光子および検光子とから構成され、走査電極と信号
電極の交点が画素となるものである。強誘電性液晶は、
以下の特性を持っていることが知られている。
(Prior art) A matrix-type ferroelectric liquid crystal panel consists of a smectic C phase ferroelectric liquid crystal layer with a thickness of several micrometers, a glass plate facing to form an envelope, and an inner surface of the ferroelectric liquid crystal layer. It consists of a transducer-like transparent scanning electrode and a transparent signal electrode that are formed in a cross section and are approximately orthogonal to each other, and a polarizer and an analyzer that are placed outside the envelope, and the intersection of the scanning electrode and the signal electrode is the pixel This is the result. Ferroelectric liquid crystal is
It is known to have the following properties.

(a) fs!圧を印加後に、およそ二つに分けられる
安定状態を有し、そのどちらの安定状態を取るかによっ
て透過光または反射光が明または暗状態を取る。従って
白や黒等の2値表示に使用できる。
(a) fs! After applying pressure, there are approximately two stable states, and depending on which stable state the transmitted light or reflected light is in a bright or dark state. Therefore, it can be used for binary display such as white or black.

(b)印加電圧の極性によって上記状態間の遷移が制御
される。
(b) The transition between the states is controlled by the polarity of the applied voltage.

(c)印加電圧パルスの幅が決まったときに上記状態遷
移を起こす電圧に対するしきい値が存在する。
(c) There is a threshold value for the voltage that causes the above state transition when the width of the applied voltage pulse is determined.

このような強誘電性液晶を用いたマトリクス形液晶パネ
ルの駆動方法は、例えば米国の情報表示学会S I D
1985年発行の5ID85ダイジ工ツト第131頁〜
第134頁に記載されており、白と黒の2値による文字
・記号の1画面の書込み表示は1例えば初めが黒で次が
白の二度の線順次方式走査による書込みで行われる。
A method for driving a matrix type liquid crystal panel using such ferroelectric liquid crystal is known, for example, from the Information Display Society of the United States SID.
5ID85 Daiji Kotsu, published in 1985, page 131~
As described on page 134, writing and displaying characters/symbols on one screen using binary values of white and black is performed by writing by two line sequential scans, for example, first in black and then in white.

これらの従来の駆動方法を第4図と第5図を用いて説明
する。第4図は走査電極(Y、)、(Y、)、(Y、)
These conventional driving methods will be explained using FIGS. 4 and 5. Figure 4 shows scanning electrodes (Y,), (Y,), (Y,)
.

、為。, for.

一、 (Y、)と信号電極(xiL(xzL(xi)t
・e(x) テ構成されるマトリクス形表示パネルにお
いて、表示しようとするパターンが黒で表示され、他の
下地が白で表示されている例を示す図である。第5図は
各々の電極及び画素に印加される電圧波形を示し、同図
において例えば、 (X□Y1)は信号電極(xよ)と
走査電極(Yl)との交点の画素部の液晶に加わる電圧
波形、同じ<(JI;、Y、)は信号電極(xl)と走
査電極(T2)との交点の画素部の液晶に加わる電圧波
形を表している。
1. (Y,) and signal electrode (xiL(xzL(xi)t
FIG. 2 is a diagram illustrating an example in which a pattern to be displayed is displayed in black and other backgrounds are displayed in white in a matrix type display panel configured with e(x). Figure 5 shows the voltage waveforms applied to each electrode and pixel. The applied voltage waveform, the same <(JI;, Y,), represents the voltage waveform applied to the liquid crystal of the pixel portion at the intersection of the signal electrode (xl) and the scanning electrode (T2).

即ち、この駆動方法は走査電極駆動パルス及び信号電極
駆動パルスが、電圧の絶対値と幅が等して正負一対の幅
tのパルスから成り、信号電極駆動パルスの位相を走査
電極駆動パルスの位相と逆にするか同じにするかによっ
て1画素の液晶に印加される電圧を変化させて情報を書
込んでいる。
That is, in this driving method, the scan electrode drive pulse and the signal electrode drive pulse are composed of a pair of positive and negative pulses with a width t equal to the absolute value of the voltage, and the phase of the signal electrode drive pulse is set to the phase of the scan electrode drive pulse. Information is written by changing the voltage applied to the liquid crystal of one pixel depending on whether the voltage is reversed or the same.

第5図において期間(T1)では第4図の黒の部分だけ
が(Y□L (T2 L (T3 L・−・、 (ym
)の順序で黒に書込まれて表示され5例えば信号電極(
X□)と走査電極(yt )との交点の画素■は第5図
の波形(X、Yt)の■で書込まれ、その他の部分は例
えば信号電極(xよ)と走査電極(T2)の交点の画素
■のように波形(xivz)のようなパルスが加わるが
、パルスの太きさが不十分であり、液晶は状態遷移を起
さない。
In Fig. 5, during the period (T1), only the black part in Fig. 4 is (Y□L (T2 L (T3 L・-・, (ym
) are written and displayed in black in the order of 5, for example, the signal electrode (
The pixel ■ at the intersection of X□) and the scanning electrode (yt) is written with ■ of the waveform (X, Yt) in FIG. A pulse having a waveform (xivz) is applied to the pixel (2) at the intersection of the pixel (2), but the pulse width is insufficient and the liquid crystal does not undergo a state transition.

期間(T□)詰引続く期間(T2)では、第4図で黒以
外の部分の画素を白に書込む期間であり、走査電極駆動
パルスの極性が期間(T1)と逆転している0画素部を
白とする電圧は第5図の波形(x1Y2)の(イ)であ
り、期間(T工)で黒に書込まれた画素のは、期間(T
、)ではパルスの大きさが小さいため、黒から白への状
態遷移は生じない。
Period (T□) In the following period (T2), pixels in areas other than black in FIG. The voltage that makes the pixel part white is (a) of the waveform (x1Y2) in Figure 5, and the voltage of the pixel written black in the period (T) is the voltage that makes the pixel part white.
, ), the pulse size is small, so no state transition from black to white occurs.

(発明が解決しようとする問題点) このようにして白黒の表示が行なえるが、走査電極数が
m本のマトリクス形表示パネルでは、1画面の書込み時
間T (T、 + TZ )は2tmとなり、2度の画
素走査を行なうために長いという欠点が生じていた。
(Problem to be Solved by the Invention) Black and white display can be performed in this way, but in a matrix display panel with m scanning electrodes, the writing time T (T, + TZ) for one screen is 2tm. , the disadvantage is that it is long because pixel scanning is performed twice.

〔発明の構成〕[Structure of the invention]

(問題点を解決するための手段) 本発明は上記の点に鑑みなされたもので、情報の書込み
の前に複数の走査電極に相当する部分の消去動作を同時
に行い、2値表示の一方である黒または白にし、一画面
の書込み時間を短縮するマトリクス形強誘電性液晶パネ
ルの駆動方法を提供するものである。
(Means for Solving the Problems) The present invention has been made in view of the above points, and it is possible to simultaneously perform an erasing operation on the portions corresponding to a plurality of scanning electrodes before writing information, and to The present invention provides a method for driving a matrix type ferroelectric liquid crystal panel that provides a certain black or white color and shortens the writing time for one screen.

(作  用) 即ち本発明は、分子が双極子をもつ強誘電性液晶を使用
し、直交する走査電極と信号電極を有するマトリクス駆
動形表示パネルの白黒等の2値表示動作方法において、
複数本の走査電極に信号電極との間に同時に電圧を印加
し、それらの間にある液晶分子の双極子の向きをすべて
一方向にして白または黒の消去状態とした後、これら複
数本の走査電極を一本ずつ順々に走査し、その走査に同
期した情報信号電圧を信号電極に加え、双極子の向きを
表示する情報信号にしたがい逆方向にし、黒または白と
することによって前記複数本分を表示状態とする。そし
て引続いて次の複数本の走査電極につき同様の動作を行
い、順次すべての走査電極にこの動作を及ぼすことによ
って、一つの画面を表示状態とする強誘電性液晶表示パ
ネルのマトリクス動作方式である。
(Function) That is, the present invention provides a binary display operation method such as black and white for a matrix drive type display panel that uses a ferroelectric liquid crystal whose molecules have dipoles and has orthogonal scanning electrodes and signal electrodes.
A voltage is simultaneously applied between the multiple scanning electrodes and the signal electrode, and the dipoles of the liquid crystal molecules between them are all oriented in one direction to create a white or black erased state. The plurality of scanning electrodes are sequentially scanned one by one, an information signal voltage synchronized with the scanning is applied to the signal electrodes, and the direction of the dipole is reversed according to the information signal to display the dipole, thereby making it black or white. Display the duty. Then, the same operation is performed for the next plurality of scanning electrodes, and by sequentially applying this operation to all the scanning electrodes, the matrix operation method of the ferroelectric liquid crystal display panel is used to display one screen. be.

(実施例) 以下本発明の詳細を第4図に示したパターンを表示する
場合を例にとり、図面を参照して説明する。
(Example) The details of the present invention will be described below with reference to the drawings, taking as an example the case where the pattern shown in FIG. 4 is displayed.

第2図は本発明を適用するマトリクス形強誘電性液晶パ
ネルの一例を示す断面図である。同図において1例えば
ITOからなる複数本(m本)の走査電極(20)が形
成された第1基板(21)例えばガラス板と、例えばI
TOからなる複数本(n本)の信号電極(22)が形成
された第2基板(23)例えばガラス板とは、走査及び
信号電極(20)、 (22)が向きあった状態で対向
し、この間にはカイラルスメクチックC相の強誘電性液
晶(24)が挾持されているとともに、外周面は例えば
紫外線硬化型接着剤からなる封着剤(25)により封止
されている。そして第1基板(21)の走査電極(20
)が形成されていない方の側の面上には偏光板(26)
、第2基板(23)の信号電極(22)が形成されてい
ない方の側の面上には偏光板(27)と反射板(28)
が被着されている。なお走査及び信号電極(20)、 
(22)は強誘電性液晶(24)を介して直交しており
、その交点となる部分が画素である。
FIG. 2 is a sectional view showing an example of a matrix type ferroelectric liquid crystal panel to which the present invention is applied. In the figure, a first substrate (21), for example, a glass plate, on which a plurality of (m) scanning electrodes (20) made of, for example, ITO are formed, and a first substrate (21), for example, a glass plate, and
A second substrate (23) on which a plurality of (n) signal electrodes (22) made of TO are formed, for example a glass plate, faces the scanning and signal electrodes (20) and (22) facing each other. A chiral smectic C-phase ferroelectric liquid crystal (24) is sandwiched between them, and the outer peripheral surface is sealed with a sealant (25) made of, for example, an ultraviolet curing adhesive. And the scanning electrode (20) of the first substrate (21)
) is not formed with a polarizing plate (26).
A polarizing plate (27) and a reflecting plate (28) are disposed on the surface of the second substrate (23) on the side where the signal electrode (22) is not formed.
is covered. Note that scanning and signal electrodes (20),
(22) are orthogonal to each other via the ferroelectric liquid crystal (24), and the intersection is the pixel.

第1図は本発明の一実施例を説明するための電圧波形図
であり、第2図に示したマトリクス形強誘電性液晶パネ
ルの走査電極(Y□)=(yz)、(vi)−・・・。
FIG. 1 is a voltage waveform diagram for explaining one embodiment of the present invention, and the scanning electrode (Y□)=(yz), (vi)- of the matrix type ferroelectric liquid crystal panel shown in FIG. ....

(Y、)に印加する走査電極駆動波形(y、)、(ya
)、(y3)。
Scan electrode drive waveforms (y,) applied to (Y,), (ya
), (y3).

”・y(YJ と、同じく信号電極(xt)、(xi)
、(x、Hニー印加する信号電極駆動波形(Xt)t(
xa)t(x、)、更に信号電極(Xユ)と走査電極(
Yl)との交点の画素(υに加わる電圧波形(x、yt
)、信号電極(xl)と走査電極(Y3)との交点の画
素■に加わる電圧波形(xtvi)、信号電極(x4)
と走査電極(Y、)との交点の画素■に加わる電圧波形
(X4Y*)を示している。
”・y(YJ, as well as signal electrodes (xt), (xi)
, (x, H knee applied signal electrode drive waveform (Xt)t(
xa)t(x,), and further the signal electrode (Xyu) and the scanning electrode (
The voltage waveform (x, yt
), the voltage waveform (xtvi) applied to the pixel ■ at the intersection of the signal electrode (xl) and the scanning electrode (Y3), the signal electrode (x4)
It shows the voltage waveform (X4Y*) applied to the pixel (2) at the intersection of the and scanning electrodes (Y, ).

第1図においてta(=t)の期間は消去のための期間
であり、この期間に振幅が例えば3Eで幅がte/2の
負と正の一対の消去用走査1!極駆動パルス(40)が
すべての走査電極(Yl)、(Y、)、・・・、 (Y
+、)に印加され、同時に信号電極(X、)、(L)、
・・・−(xJにも前述のパルス(40)と逆相で振幅
が例えばEの一対のパルス(41)が印加され、その結
果すべての画素には(xtyt)−(xlyz)−(x
4y*)の点線で示したような振幅が4Eで正と負の一
対のパルス(42)が加わる。このため液晶分子の双極
子の向きはteの期間の正。
In FIG. 1, a period ta (=t) is a period for erasing, and during this period, a pair of negative and positive erasing scans 1! with an amplitude of, for example, 3E and a width of te/2 is performed. The polar drive pulse (40) is applied to all scanning electrodes (Yl), (Y, ), ..., (Y
+, ) and simultaneously the signal electrodes (X, ), (L),
...-(xJ is also applied with a pair of pulses (41) having an opposite phase to the above-mentioned pulse (40) and having an amplitude of, for example, E, and as a result, (xtyt) - (xlyz) - (x
4y*), a pair of positive and negative pulses (42) with an amplitude of 4E are added as shown by the dotted line. Therefore, the dipole direction of the liquid crystal molecules is positive during the period te.

負に従がい反転するが、 teの後半の極性で固定され
た一方向になるように液晶分子は並びに全画面が例えば
白と消去状態となる。
The liquid crystal molecules are reversed according to the negative polarity, but the liquid crystal molecules are aligned in one direction fixed by the polarity of the second half of te, and the entire screen becomes, for example, white and an erased state.

この後、直ちに走査電極(yt)t(vz)、・・・、
 (Y、)には順々に振幅が3Eで幅がtの正負一対の
走査パルス(43)が加えられ、これらの走査パルス(
43)に同期して表示すべき文字・記号等のパターンに
応じた信号パルス(44)が信号電極駆動パルスとして
第1図の(xt)、(xz)、(x、)に示すように加
えられる。
After this, immediately scan electrodes (yt)t(vz),...
A pair of positive and negative scanning pulses (43) with an amplitude of 3E and a width of t are sequentially applied to (Y, ), and these scanning pulses (
43), signal pulses (44) corresponding to patterns of characters, symbols, etc. to be displayed are added as signal electrode drive pulses as shown in (xt), (xz), (x,) in Figure 1. It will be done.

これらの信号パルス(44)は振幅がEで、黒く表示す
るためには走査パルス(43)と逆相の負と正の一対の
パルスであり、白のままにする場合は同相のパルスであ
る。なお、一対のパルスの幅は走査パルスと同じくtで
ある。この動作方式により、第4図で黒の状態となる画
素■、■に加わる電圧波形を第1図の(X1Y、)、 
(X4X、)に白の状態となる画素■に加わる電圧波形
を同じ< (X1Y、)にそれぞれ示す。画素0)では
消去パルス(42)により白くなってから、直ちに書込
みパルス(45)によって黒くなり、以後走査電極(Y
、)が走査を受ける後でも双極子の向きは反転せず、黒
の状態が保持される画素■では消去パルス(42)によ
り白くなってから走査電極(Y、)が走査を受けるまで
白の状態であるが、その後は黒の状態が画素■と同様に
保持される。
These signal pulses (44) have an amplitude of E, and are a pair of negative and positive pulses in opposite phase to the scanning pulse (43) to display black, and in-phase pulses to remain white. . Note that the width of the pair of pulses is t, same as the scanning pulse. With this operation method, the voltage waveforms applied to the pixels ■, ■, which are in the black state in FIG. 4, are changed to (X1Y,) in FIG.
(X4X,) shows the voltage waveforms applied to the pixel ■ which becomes white, respectively. Pixel 0) becomes white by the erase pulse (42), then immediately becomes black by the write pulse (45), and thereafter the scanning electrode (Y
, ) is scanned, the direction of the dipole is not reversed, and the pixel ■ maintains its black state. After turning white by the erase pulse (42), it remains white until the scanning electrode (Y, ) is scanned. However, after that, the black state is maintained similarly to pixel ■.

画素■は消去パルス(42)による白の状態が走査の最
後まで保持される。このようにして一画面の走査後にメ
モリ機能を有する2値表示が達成される。
The pixel (2) maintains its white state due to the erase pulse (42) until the end of scanning. In this way, a binary display with memory function is achieved after scanning one screen.

この実施例では走査電極(vx)、(yz)、・・・、
 (Y、)に同時に電圧即ちパルス(40)を印加し、
その部分に相当する双極子の向きを一方向にして白の消
去状態とした後、これら走査型t!(y、)、(yt)
、・・・、(Yl)を線順次方式で走査し、表示する情
報信号即ち信号電極(xt)t(xz)t・・・、 (
X、)に印加されるパルスにしたがい双極子の向きを逆
方向にし、黒とすることによって一つの画面を表示状態
としている。この結果、一画面の書込みを行なう時間T
は(m+1)tであり、従来の書込み時間のほぼ半分と
なる。
In this embodiment, scanning electrodes (vx), (yz), . . .
(Y,) simultaneously applying a voltage or pulse (40);
After setting the orientation of the dipole corresponding to that part in one direction to create a white erased state, these scanning type t! (y,), (yt)
,..., (Yl) is scanned in a line sequential manner to display information signals, that is, signal electrodes (xt)t(xz)t..., (
According to the pulse applied to X, ), the direction of the dipole is reversed and the screen becomes black, thereby making one screen in a display state. As a result, it takes T
is (m+1)t, which is approximately half of the conventional writing time.

なおリフレッシュ動作は、一画面の走査が終了した後も
繰り返して走査を実施すればよい。
Note that the refresh operation may be performed repeatedly even after the scanning of one screen is completed.

ところで前述の実施例では、黒による情報の書込みの前
に全画面を白の消去状態にしたが、ここでは文字一部分
即ち一行のアルファニューメリック或いは片仮名文字・
記号を表示するのに用いられる走査電極8本ずつを順々
に画面の上から選び、同時消去の白の状態とし、次にこ
れらの8本の走査電極の線順次走査で黒による情報の書
込みを行っていく方式について第3図を用いて第4図に
示すパターンを表示する場合につき説明する。
By the way, in the above-mentioned embodiment, the entire screen was erased in white before writing information in black, but here, a portion of the characters, that is, one line of alphanumeric or katakana characters, is erased.
Each of the eight scanning electrodes used to display a symbol is selected from the top of the screen one after the other, and is simultaneously erased in a white state.Next, these eight scanning electrodes are sequentially scanned to write information in black. A method for displaying the pattern shown in FIG. 4 will be described using FIG. 3.

ここで走査電極駆動パルス(yx)、(ya)、・・・
−(Yll)、信号電極駆動パルス(X工)、(Xl)
、(Xl)、これらの合成波形であり画素の、■、■に
加わる電圧波形(X、Y、)、 (X1Y、)、 (X
4Y、)はそれぞれ前述の実施例と同様の振幅と幅をも
つパルスであり、第1図と同じパルスには同一の番号を
付しその説明を省略する。
Here, scanning electrode drive pulses (yx), (ya),...
- (Yll), signal electrode drive pulse (X engineering), (Xl)
, (Xl), these combined waveforms are the voltage waveforms (X, Y,), (X1Y,), (X
4Y, ) are pulses having the same amplitudes and widths as in the previous embodiment, and the same pulses as in FIG. 1 are given the same numbers and their explanations will be omitted.

書込み表示の動作は次のとおりである。即ち、最初のt
eの期間に走査電極(yt)t(yzL”’t (Yl
)にそれぞれ振幅が3Eで幅がteの負と正の消去用走
査電極駆動パルス(60)を、信号電極(X、 ) 、
 (Xl )、・・・。
The operation of writing display is as follows. That is, the first t
During the period e, the scanning electrode (yt)t(yzL"'t (Yl
), negative and positive erasing scan electrode drive pulses (60) with an amplitude of 3E and a width of te are applied to the signal electrodes (X, ),
(Xl),...

(×、)にこのパルス(60)と逆相で振幅がEのパル
ス(61)をそれぞれ印加し、8本の走査電極(Y工)
、(Ya)。
A pulse (61) with an amplitude of E and a phase opposite to this pulse (60) is applied to (×,), and the eight scanning electrodes (Y process) are
, (Ya).

・・・、 (Ys)の部分をパルス(62)によりすべ
て白の消去状態とする。その後、走査電極(Yl)、(
Y2)、・・・。
. . . The part (Ys) is completely erased in white by the pulse (62). After that, the scanning electrode (Yl), (
Y2),...

(Y、)を順々に線順次で走査し、同時に表示するパタ
ーンに応じた信号を信号電極(Xよ)、(Xl)、・・
・、 (X、)に印加して黒の書込みを行い、8本の走
査電極(Y、)、(Yl)、・・・−(Vs)の部分に
白地に黒の文字・記号等の表示を行う。続いて走査電極
(Ys)、(Y、、)。
(Y,) are scanned line-sequentially, and signals corresponding to the simultaneously displayed patterns are transmitted to the signal electrodes (X), (Xl), . . .
・、Write black by applying voltage to (X,), and display black characters/symbols on a white background on the eight scanning electrodes (Y,), (Yl), ...-(Vs). I do. Next, scanning electrodes (Ys), (Y,,).

”’=(vzs)と信号電極(Xl)、(X、)、−、
(X、)間に消去用のパルス(63)、 (64)を印
加した後に線順次で走査しながら、同じく表示パターン
に応じた信号を信号電極(xx ) 、 (X、 ) 
、−、(xx) ニ印加し、パ/L/X(65)により
消去状態とした白地に書込みパルス(45)により黒の
書込みを行う。このようにして8行ずつ白地に黒の書込
みを順々に実施して全画面の書込みを行い5文字・記号
等のメモリ表示或いはリフレッシュ表示ができる。
``'=(vzs) and signal electrode (Xl), (X,), -,
After applying erasing pulses (63) and (64) between (X, ), while scanning line-sequentially, a signal corresponding to the display pattern is also applied to the signal electrodes (xx) and (X, ).
. In this way, writing is performed in black on a white background in 8 lines in sequence to fill the entire screen, and 5 characters, symbols, etc. can be displayed in memory or refreshed.

この実施例は、まず8本の走査電極(M、)、(Y、)
In this example, first, eight scanning electrodes (M,), (Y,)
.

・・・、 (Y、)に同時に電圧を印加して白の消去状
態とした後、これらの走査電極(Y、)、(Y、)、・
・・−(Ya)を線順次方式で走査して表示状態とする
動作を1画面を構成する他の走査電極(Y−’)= (
yt。)、・・・、(Y、)すべてに順々に及ぼし、一
つの画面を表示状態としている。この結果、一画面の書
込みを行なう時間■は−Ltであり従来の方式に比較し
短縮される。
After simultaneously applying voltage to (Y,) to create a white erased state, these scanning electrodes (Y,), (Y,), .
...-(Ya) in a line-sequential manner to bring it into the display state using other scanning electrodes (Y-') that make up one screen = (
yt. ), . . . , (Y,) in order, and one screen is displayed. As a result, the time (2) for writing one screen is -Lt, which is shorter than in the conventional method.

また本発明の方式では次のような利点がある。Furthermore, the method of the present invention has the following advantages.

即ち、本発明の動作方式では白(又は黒)の消去状態と
する場合、第3図の点線で示したように振幅の異なる2
種のパルスがあるが1画素ωに加ねるパルスを見ると、
パルス(66)はパルス(62)にくらべ十分に小さい
ので、遷移の一方の黒(又は白)から白(又は黒)への
電圧閾値特性が急峻でなくともよい。しかるに従来の動
作方式では前述の2種のパルスの中間の振幅をもつパル
スが状態を遷移させる場合に生じるので、両方向の遷移
に対し電圧閾値特性が急峻であることが必要であった。
That is, in the operation method of the present invention, when a white (or black) erased state is created, two
There is a seed pulse, but if you look at the pulse added to one pixel ω,
Since the pulse (66) is sufficiently smaller than the pulse (62), the voltage threshold characteristic from one side of the transition from black (or white) to white (or black) does not have to be steep. However, in the conventional operation method, since a pulse having an amplitude intermediate between the above-mentioned two types of pulses occurs when a state transition occurs, it is necessary that the voltage threshold characteristic be steep for transitions in both directions.

上記の二つの実施例では一度に消去する走査電極の数を
m本の全部と8本としたが、これらに限らず、漢字表示
に都合のよい16本、24本、32本でもよく、またそ
の他の任意の複数の本数でもよい6また上記の実施例で
は、消去動作により白の表示としたが、駆動波形の極性
を逆にし黒とし情報の書込みを白とすることも可能であ
り、また偏光子と検光子の配置角度を変えることによっ
ても白と黒を逆転できる。
In the above two embodiments, the number of scanning electrodes to be erased at one time was 8, all of m, but it is not limited to these, and may be 16, 24, or 32, which is convenient for displaying kanji characters. Any other number of wires may be used.6Also, in the above embodiment, white is displayed by the erasing operation, but it is also possible to reverse the polarity of the drive waveform to make it black and write information white. White and black can also be reversed by changing the placement angle of the polarizer and analyzer.

更に上記の実施例では、走査電極駆動パルス及び信号電
極駆動パルスのそれぞれの振幅を32. Eとしたが、
他の組合わせ、例えば2E、Eや4E、 E等でもよい
Further, in the above embodiment, the amplitude of each of the scan electrode drive pulse and the signal electrode drive pulse is set to 32. I set it as E, but
Other combinations such as 2E, E, 4E, E, etc. may also be used.

また上記の実施例では液晶としてカイラルスメクチック
C相を用いたが、2色性色素を混合したいbゆるGH形
の強誘電性液晶の場合にも、本発明の動作方式を用いる
ことができる。
Furthermore, although a chiral smectic C phase was used as the liquid crystal in the above embodiment, the operation method of the present invention can also be used in the case of a GH type ferroelectric liquid crystal in which a dichroic dye is mixed.

更に本発明の動作方式は、マトリックス形表示パネル以
下にセグメント形のパネルの時分割駆動にも適用できる
ことは明白であり、その詳細な説明は省略する。
Furthermore, it is obvious that the operation method of the present invention can also be applied to time-division driving of segment-type panels below matrix-type display panels, and detailed explanation thereof will be omitted.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明のマトリックス形強誘電性液
晶パネルの動作方式は、複数本の走査電極に同時に電圧
を印加して消去状態とした後、これらの走査電極を線順
次方式で走査して表示状態とする動作を、1回或いは複
数回行うことにより一つの画面を表示状態としているの
で、従来に比べ一画面への情報書込み時間が短縮でき、
より速い表示動作が可能になる。
As explained above, the operation method of the matrix-type ferroelectric liquid crystal panel of the present invention is to simultaneously apply voltage to a plurality of scan electrodes to create an erased state, and then scan these scan electrodes in a line-sequential manner. Since one screen is set to the display state by performing the operation to set the display state once or multiple times, the time required to write information to one screen can be shortened compared to the conventional method.
Faster display operation is possible.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例を説明するための電圧波形図
、第2図は本発明を適用するマトリクス形強誘電性液晶
パネルの一例を示す断面図、第3図は本発明の他の実施
例を説明するための電圧波形図、第4図はマトリクス形
強誘電性液晶パネルの表示パターンの一例を示す概略図
、第5図は従来のマトリクス形強誘電性液晶パネルの駆
動方法を説明するための電圧波形図である。 (20) 、 (Y、)、 (yz)、・・・、 (Y
、)・・・・・・走査電極(21)・・・・・・第1基
板 (22)、(X、)、(X2)、−、(X111戸・・
・・・信号電極(23)・・・・・・第2基板 (24)・・・・・・強誘電性液晶 代理人 弁理士 則 近 憲 佑 同  大胡典夫 第  1  図 第  2  図 第  3 図 XI XzX3X4−−−−− Xn 第4図
FIG. 1 is a voltage waveform diagram for explaining one embodiment of the present invention, FIG. 2 is a cross-sectional view showing an example of a matrix type ferroelectric liquid crystal panel to which the present invention is applied, and FIG. 3 is a voltage waveform diagram for explaining an embodiment of the present invention. FIG. 4 is a schematic diagram showing an example of the display pattern of a matrix type ferroelectric liquid crystal panel, and FIG. 5 is a diagram showing a conventional method of driving a matrix type ferroelectric liquid crystal panel. It is a voltage waveform diagram for explanation. (20) , (Y,), (yz), ..., (Y
,)...Scanning electrode (21)...First substrate (22), (X,), (X2), -, (X111 units...
...Signal electrode (23) ...Second substrate (24) ... Ferroelectric liquid crystal agent Patent attorney Norihiko Ken Yudo Norio Ogo Figure 1 Figure 2 Figure 3 Figure XI XzX3X4 ------ Xn Figure 4

Claims (2)

【特許請求の範囲】[Claims] (1)複数本の走査電極が形成された第1基板と複数本
の信号電極が形成された第2基板との間に強誘電性液晶
を挾持してなるマトリクス形強誘電性液晶パネルの2値
表示を行なう動作方式において、まず複数本の前記走査
電極の部分に相当する前記強誘電性液晶の液晶分子の双
極子の向きを同時に一方向にして白または黒の消去状態
とした後、これらの複数本の走査電極を線順次方式で走
査し、表示する情報信号にしたがい前記双極子の向きを
逆方向にし、黒または白とすることによって前記複数本
分を表示状態とする動作を、画面を構成する他の走査電
極すべてに順々に及ぼし、一つの画面を表示状態とする
ことを特徴とするマトリクス形強誘電性液晶パネルの動
作方式。
(1) Two matrix-type ferroelectric liquid crystal panels in which ferroelectric liquid crystal is sandwiched between a first substrate on which a plurality of scanning electrodes are formed and a second substrate on which a plurality of signal electrodes are formed. In the operation method for displaying values, first, the orientation of the dipoles of the liquid crystal molecules of the ferroelectric liquid crystal corresponding to the portions of the plurality of scanning electrodes is simultaneously set to one direction to create a white or black erased state. The operation of scanning the plurality of scanning electrodes in a line sequential manner, reversing the direction of the dipoles according to the information signal to be displayed, and setting the plurality of scanning electrodes to the display state by making them black or white is performed on the screen. A method of operating a matrix-type ferroelectric liquid crystal panel, which is characterized in that a single screen is brought into a display state by sequentially applying the same voltage to all other scanning electrodes that make up the panel.
(2)同時に電圧を印加し消去状態とする複数本の前記
走査電極は、画面を構成するすべての走査電極、或いは
文字1行分の走査電極であることを特徴とする特許請求
の範囲第1項記載のマトリクス形強誘電性液晶パネルの
動作方式。
(2) The plurality of scan electrodes to which a voltage is simultaneously applied and put into an erased state are all scan electrodes forming a screen, or scan electrodes for one line of characters. Operation method of the matrix type ferroelectric liquid crystal panel described in Section 2.
JP1682186A 1986-01-30 1986-01-30 Operation system of matrix type ferroelectric liquid crystal panel Pending JPS62175714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1682186A JPS62175714A (en) 1986-01-30 1986-01-30 Operation system of matrix type ferroelectric liquid crystal panel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1682186A JPS62175714A (en) 1986-01-30 1986-01-30 Operation system of matrix type ferroelectric liquid crystal panel

Publications (1)

Publication Number Publication Date
JPS62175714A true JPS62175714A (en) 1987-08-01

Family

ID=11926836

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1682186A Pending JPS62175714A (en) 1986-01-30 1986-01-30 Operation system of matrix type ferroelectric liquid crystal panel

Country Status (1)

Country Link
JP (1) JPS62175714A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6360428A (en) * 1986-08-29 1988-03-16 Canon Inc Driving method for optical modulating element
JPS6361233A (en) * 1986-09-01 1988-03-17 Canon Inc Driving method for optical modulating element
JPS63212921A (en) * 1987-03-02 1988-09-05 Fujitsu Ltd Method for driving liquid crystal display device
JPH01170989A (en) * 1987-12-25 1989-07-06 Hosiden Electron Co Ltd Liquid crystal display erasing method
JPH0210398A (en) * 1988-06-29 1990-01-16 Matsushita Electric Ind Co Ltd Driving method for display device
US5477235A (en) * 1992-10-08 1995-12-19 Sharp Kabushiki Kaisha Method for driving a ferroelectric liquid crystal panel
US5490000A (en) * 1992-12-07 1996-02-06 Casio Computer Co., Ltd. Deformed helix ferroelectric liquid crystal display device and method of driving
US6414669B1 (en) * 1998-05-14 2002-07-02 Minolta Co., Ltd. Driving method and apparatus for liquid crystal display device
EP1286202A1 (en) * 2001-02-05 2003-02-26 Matsushita Electric Industrial Co., Ltd. Liquid crystal display unit and driving method therefor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6360428A (en) * 1986-08-29 1988-03-16 Canon Inc Driving method for optical modulating element
JPS6361233A (en) * 1986-09-01 1988-03-17 Canon Inc Driving method for optical modulating element
JPS63212921A (en) * 1987-03-02 1988-09-05 Fujitsu Ltd Method for driving liquid crystal display device
JPH01170989A (en) * 1987-12-25 1989-07-06 Hosiden Electron Co Ltd Liquid crystal display erasing method
JPH0210398A (en) * 1988-06-29 1990-01-16 Matsushita Electric Ind Co Ltd Driving method for display device
US5477235A (en) * 1992-10-08 1995-12-19 Sharp Kabushiki Kaisha Method for driving a ferroelectric liquid crystal panel
US5490000A (en) * 1992-12-07 1996-02-06 Casio Computer Co., Ltd. Deformed helix ferroelectric liquid crystal display device and method of driving
US6414669B1 (en) * 1998-05-14 2002-07-02 Minolta Co., Ltd. Driving method and apparatus for liquid crystal display device
EP1286202A1 (en) * 2001-02-05 2003-02-26 Matsushita Electric Industrial Co., Ltd. Liquid crystal display unit and driving method therefor
EP1286202A4 (en) * 2001-02-05 2007-06-06 Matsushita Electric Ind 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

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