JPH02281233A - Ferroelectric liquid crystal element and driving method thereof - Google Patents
Ferroelectric liquid crystal element and driving method thereofInfo
- Publication number
- JPH02281233A JPH02281233A JP1101733A JP10173389A JPH02281233A JP H02281233 A JPH02281233 A JP H02281233A JP 1101733 A JP1101733 A JP 1101733A JP 10173389 A JP10173389 A JP 10173389A JP H02281233 A JPH02281233 A JP H02281233A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- scanning signal
- information signal
- ferroelectric liquid
- crystal element
- 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 17
- 238000000034 method Methods 0.000 title claims description 15
- 239000004973 liquid crystal related substance Substances 0.000 claims description 16
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract description 2
- 230000005684 electric field Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 1
- 239000004990 Smectic liquid crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3622—Control of matrices with row and column drivers using a passive matrix
- G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0205—Simultaneous scanning of several lines in flat panels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/04—Partial updating of the display screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Substances (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、液晶表示素子およびその駆動方法に関し、特
に強誘電性液晶素子を用いた液晶表示素子およびその駆
動方法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 and a method for driving the same, and more particularly to a liquid crystal display element using a ferroelectric liquid crystal element and a method for driving the same.
［従来の技術］
近年は、これまでのＴＮ型液晶素子の改善型として、双
安定性を有する液晶素子の使用がクラーク（Ｃ１ａｒｋ
）及びラガーウオール（Ｌａｇｅｒｗａｌｌ）の両者に
より特開昭５６−１０７２１６号公報、米国特許第４３
６７９２４号明細書等で提案されている。双安定性液晶
としては、一般に、カイラルスメクチックＣ相（Ｓｍｃ
＊）又はＨ相（ＳｍＨ＊）を有する強話電性液晶が用い
られる。この液晶は、電界に対して第１及び第２の光学
的安定状態からなる双安定状態を有し、従って前述のＴ
Ｎ型の液晶で用いられた光学変調素子とは異なり、例え
ば一方の電界ベクトルに対して第１の光学的安定状態に
液晶は配向し、他方の電界ベクトルに対しては第２の光
学的安定状態に液晶が配向される。またこの液晶素子は
、加えられる電界に応答して、極めて速やかに上記２つ
の安定状態のいずれかを取り、かつ電界の印加のないと
きはその状態を維持する性質を有する。このような性質
を利用することにより、上述した従来のＴＮ型素子の問
題点の多くに対して、かなり木質的な改善が得られる。[Prior Art] In recent years, the use of bistable liquid crystal elements has been promoted by Clark (C1ark) as an improved version of the conventional TN type liquid crystal elements.
) and Lagerwall in JP-A-56-107216, U.S. Pat.
This is proposed in the specification of No. 67924 and the like. Bistable liquid crystals are generally chiral smectic C phase (Smc
*) or H phase (SmH*) is used. This liquid crystal has a bistable state consisting of a first and a second optically stable state with respect to an electric field, and therefore has the above-mentioned T
Unlike optical modulation elements used in N-type liquid crystals, for example, the liquid crystal is oriented in a first optically stable state for one electric field vector, and in a second optically stable state for the other electric field vector. The liquid crystal is aligned in the state. Further, this liquid crystal element has the property of very quickly taking one of the above two stable states in response to an applied electric field, and maintaining that state when no electric field is applied. By utilizing such properties, considerable improvements can be obtained in many of the problems of the conventional TN type elements mentioned above.
また、このような双安定型の強誘電性液晶素子をマトリ
クス駆動する際の駆動法についてもこれまで多数提案さ
れている。第４図はその一例における駆動信号の波形を
示し、８１′〜８４′は第３図に示すような表示パター
ンの場合の走査信号ライン８１〜ｓ４に対応した走査信
号、■１′および１２′は情報信号ラインｌＩおよび１
２に対応した情報信号、（Ｉｌ’ Ｓ３’）および（
Ｉ２’ Ｓ２’）は波形１１′と３３′および１２′
と３２′の合成波形を、それぞれ時系列波形として示し
ている。この駆動波形は選択された走査ライン上の全画
素を一度“黒゛′に書き込んだ後、情報に応じて“黒°
゛を保持し又は°゛白°°の書き込みを行うタイプの駆
動方法であり、情報信号の波形はマトリクス駆動時の“
°ちらつき°′を軽減するように工夫されている。Furthermore, many driving methods have been proposed for matrix driving such bistable ferroelectric liquid crystal elements. FIG. 4 shows the waveform of the drive signal in one example, and 81' to 84' are the scanning signals corresponding to the scanning signal lines 81 to s4 in the case of the display pattern shown in FIG. is the information signal line lI and 1
The information signals corresponding to 2, (Il'S3') and (
I2'S2') are waveforms 11', 33' and 12'
and 32' are shown as time series waveforms, respectively. This drive waveform once writes all pixels on the selected scanning line to "black", and then writes "black" according to the information.
This is a type of driving method that maintains ゛ or writes ゛white°°, and the waveform of the information signal is the same as that during matrix driving.
It has been devised to reduce flicker°'.
［発明が解決しようとする課題］
しかしながら、上記従来例では以下のような問題点があ
る。[Problems to be Solved by the Invention] However, the above conventional example has the following problems.
（１）従来のネマティック液晶に比べて、液晶自身の応
答速度は速いが、マトリクス駆動した場合のフレーム周
波数が遅い。(1) Compared to conventional nematic liquid crystals, the response speed of the liquid crystal itself is faster, but the frame frequency when driven in a matrix is slower.
（２）マトリクス駆動可能な駆動パルスの電圧値又はパ
ルス幅の許容範囲、即ち駆動マージンが小さい。(2) The permissible range of the voltage value or pulse width of a drive pulse capable of matrix driving, that is, the drive margin is small.
そこで問題点（１）に対する改善型として、第５図に示
すように、走査線の選択期間に重なりを設けることによ
り、フレーム周波数を高くする駆動法が提案されている
。同図において、８１〜８４″およびＩｌ’＋Ｉ２＃は
第４図と同様の場合の走査信号および情報信号を示す。Therefore, as an improvement to problem (1), a driving method has been proposed in which the frame frequency is increased by providing an overlap in the selection period of the scanning lines, as shown in FIG. In the same figure, 81 to 84'' and Il'+I2# indicate scanning signals and information signals in the same case as in FIG.
この駆動法では、第４図に示した駆動法に比べてフレー
ム周波数を１．５倍にすることができる。しかしながら
、問題点（２）に述べた駆動マージンについてはさらに
減少する傾向にあり、フレーム周波数の高速化と駆動マ
ージンの確保を両立させることが困難である。With this driving method, the frame frequency can be increased by 1.5 times compared to the driving method shown in FIG. However, the drive margin mentioned in problem (2) tends to further decrease, making it difficult to simultaneously increase the frame frequency and secure the drive margin.
本発明の目的は、このような従来技術の問題点に鑑み、
強誘電性液晶素子およびその駆動方法において、フレー
ム周波数の高速化と駆動マージンの確保を両立させるこ
とにある。In view of the problems of the prior art, an object of the present invention is to
In a ferroelectric liquid crystal element and a method for driving the same, the object is to simultaneously increase the frame frequency and ensure a driving margin.
［課題を解決するための手段］
上記目的を達成するため本発明では、強誘電性液晶素子
を走査信号ラインと情報信号ラインとを有するマトリク
ス電極間に挟持し、走査信号および情報信号を走査信号
ラインおよび情報信号ラインに印加して強誘電性液晶素
子を駆動する強誘電性液晶素子およびその駆動方法にお
いて、情報信号を制御位相部と補助位相部とから成る複
数のパルスにより構成し、かつ走査信号がこの情報信号
の少なくとも１つの補助位相部のパルスを補償する位相
のパルスを有するようにしている。[Means for Solving the Problems] In order to achieve the above object, in the present invention, a ferroelectric liquid crystal element is sandwiched between matrix electrodes having a scanning signal line and an information signal line, and the scanning signal and the information signal are connected to the scanning signal. In a ferroelectric liquid crystal element and a driving method for driving the ferroelectric liquid crystal element by applying it to a line and an information signal line, the information signal is composed of a plurality of pulses consisting of a control phase part and an auxiliary phase part, and the information signal is scanned. The signal has pulses with a phase that compensates for the pulses of at least one auxiliary phase part of this information signal.
走査信号は周期的に順次走査信号ラインに印加され、少
なくとも２本以上の走査信号ラインに同時にパルスが印
加されている期間を有するのが好ましい。The scanning signal is periodically and sequentially applied to the scanning signal lines, and preferably has a period in which pulses are simultaneously applied to at least two or more scanning signal lines.
強誘電性液晶素子物質としては、次のような相転穆を示
すエステル混合物とピリミジン混合物の混合液晶を用い
ることができる。As the ferroelectric liquid crystal element material, a mixed liquid crystal of an ester mixture and a pyrimidine mixture exhibiting the following phase change can be used.
Ｃｒｙｓｔ −−−＋Ｓｃ” −−＋５Ａ−−−＋Ｃｈ
−−−−＋Ｉｓ。Cryst −−−+Sc” −−+5A−−−+Ch
----+Is.
０℃ ６０．１ｔ ７０．７℃ ８１．４℃［
作用］
この構成において、情報信号の補助位相部は画像のちら
つき等を軽減するか、走査信号はこの補助位相部のパル
スを補償する位相のパルスを有するため、情報信号の補
助位相部は補償され、これによって駆動マージンが大き
く向上し、したがって、フレーム周波数を大きくする余
裕が生じ、駆動マージンおよびフレーム周波数双方の増
大が共に達成される。0℃ 60.1t 70.7℃ 81.4℃[
Effect] In this configuration, the auxiliary phase portion of the information signal reduces flickering of the image, or the scanning signal has a pulse with a phase that compensates for the pulse of this auxiliary phase portion, so the auxiliary phase portion of the information signal is not compensated. , this greatly improves the drive margin and therefore provides room for increasing the frame frequency, and increases in both drive margin and frame frequency are achieved together.
［実施例コ 以下、図面を用いて本発明の詳細な説明する。[Example code] Hereinafter, the present invention will be explained in detail using the drawings.
第１図は本発明の一実施例に係る液晶素子における駆動
信号の波形を示し、同図（ａ）は選択信号波形、同図（
ｂ）及び（ｅ）は゛白゛°及び゛黒″の画像情報に対応
した情報信号波形を示す。同図（ｂ）において、パルス
幅ｔ２＋電圧値ｖ５の位相が制御位相であり、パルス幅
ｊ３＋電圧値−ｖ４の位相が補助位相である。前述した
ように、情報信号をこのようなパルスの構成にすること
により、非選択における“ちらつき°等の画質上の欠点
が軽減される。同図（ａ）の選択信号波形はパルス幅ｔ
１．電圧値■１の消去位相、パルス幅ｔ２＋電圧値−ｖ
２の制御位相、およびパルス幅ｔｓ、電圧値ｖ３の補助
位相、すなわち情報信号の補助位相を補償する位相より
構成される。ここで、電圧値■３は ｏ＜ｖ３＜ｙ、の
範囲にあり、１Ｖ３１−ＩＶ４１であることが望ましい
。この補償位相を設けることが本発明の特徴であり、こ
れにより前述した駆動マージンが格段に向上する。FIG. 1 shows the waveform of a drive signal in a liquid crystal element according to an embodiment of the present invention, and FIG.
b) and (e) show information signal waveforms corresponding to "white" and "black" image information. In the same figure (b), the phase of pulse width t2+voltage value v5 is the control phase, and the pulse width j3+ The phase of the voltage value -v4 is the auxiliary phase.As described above, by forming the information signal into such a pulse configuration, defects in image quality such as "flickering" in non-selection can be alleviated. The selection signal waveform in (a) of the same figure has a pulse width t
1. Voltage value ■ Erasing phase of 1, pulse width t2 + voltage value -v
2, and an auxiliary phase of pulse width ts and voltage value v3, that is, a phase that compensates for the auxiliary phase of the information signal. Here, the voltage value ■3 is in the range of o<v3<y, and is preferably 1V31-IV41. Providing this compensation phase is a feature of the present invention, and thereby the drive margin described above is significantly improved.
また、消去位相で選択された走査線上の画素は、−斉に
黒の状態に消去されるのがよい。Furthermore, it is preferable that the pixels on the scanning line selected in the erasing phase be erased all at once to a black state.
第２図（Ａ）及び（Ｂ）はこの駆動例によって第３図に
示すような表示を行なったときの時系列波形を示す。FIGS. 2A and 2B show time-series waveforms when displaying as shown in FIG. 3 is performed using this driving example.
同図において、３１〜Ｓ４は第３図の走査信号ラインｓ
、”−ｓ４の走査信号波形、ｌｌおよびＩ２は第３図の
情報信号ラインｉＩおよび１２の情報信号波形、そして
（ＩＩ Ｓ３）および（Ｉ２ Ｓ２ ）は情報信号
波形■１と走査信号波形Ｓ３の合成波形および情報信号
波形Ｉ２と走査信号波形Ｓ２の合成波形である。特に、
第２図（Ａ）に示すシーケン又は、フレーム周波数を低
み
く設定できるので好ましいものである。In the same figure, 31 to S4 are the scanning signal lines s in FIG.
, "-s4 scanning signal waveforms, ll and I2 are the information signal waveforms of information signal lines iI and 12 in FIG. A composite waveform and a composite waveform of the information signal waveform I2 and the scanning signal waveform S2.In particular,
This is preferable because the sequence shown in FIG. 2(A) or the frame frequency can be set low.
第１図に示した駆動例に従い、室温で１／４００デユー
テイで駆動したところ、第４図に示した駆動法に比べて
、フレーム周波数は約１．３倍に速まり、また、駆動マ
ージンも約１割増加した。さらに、第５図に示した従来
の駆動法と比較すると、駆動マージンが約５割程度増加
した。When driven at room temperature with a duty of 1/400 according to the driving example shown in Figure 1, the frame frequency was approximately 1.3 times faster than the driving method shown in Figure 4, and the driving margin was also reduced. It increased by about 10%. Furthermore, compared to the conventional driving method shown in FIG. 5, the driving margin increased by about 50%.
［発明の効果］
以上説明したように、走査信号波形に補償位相を設ける
ことにより、高速化および駆動マージンを増加させるこ
とができ、駆動特性を極めて向上させることが可能にな
る。[Effects of the Invention] As described above, by providing a compensation phase in the scanning signal waveform, it is possible to increase the speed and drive margin, and it is possible to significantly improve the drive characteristics.
第１図（ａ）〜（ｃ）は、本発明の一実施例に係る液晶
素子における駆動信号の波形を示す波形図、
＋＋Ｎ
第２図（Ａ）及び（Ｂ）は、第１図で示すような駆動例
による駆動信号の時系列波形を示すタイミングチャート
、
第３図は、液晶素子による表示パターンを例示する模式
図、そして
第４図および第５図は、従来例に係る駆動信号の時系列
波形を示すタイミングチャートである。
区
Ｊ
櫟FIGS. 1(a) to (c) are waveform diagrams showing waveforms of drive signals in a liquid crystal element according to an embodiment of the present invention, ++N FIGS. 2(A) and (B) are shown in FIG. 3 is a schematic diagram illustrating a display pattern by a liquid crystal element, and FIGS. 4 and 5 are timing charts showing time-series waveforms of drive signals according to conventional drive examples. 5 is a timing chart showing series waveforms. Ward J Ryu
Claims (4)
インとを有するマトリクス電極間に挟持し、走査信号お
よび情報信号を走査信号ラインおよび情報信号ラインに
印加して強誘電性液晶素子を駆動する強誘電性液晶素子
において、情報信号が制御位相部と補助位相部とから成
る複数のパルスにより構成され、かつ走査信号がこの情
報信号の少なくとも１つの補助位相部のパルスを補償す
る位相のパルスを有することを特徴とする強誘電性液晶
素子。(1) A ferroelectric liquid crystal material is sandwiched between matrix electrodes having a scanning signal line and an information signal line, and a scanning signal and an information signal are applied to the scanning signal line and the information signal line to drive the ferroelectric liquid crystal element. In a ferroelectric liquid crystal device, the information signal is composed of a plurality of pulses consisting of a control phase part and an auxiliary phase part, and the scanning signal is a pulse having a phase that compensates for the pulse of at least one auxiliary phase part of the information signal. A ferroelectric liquid crystal element characterized by having:
加され、少なくとも２本以上の走査信号ラインに同時に
パルスが印加されている期間を有する請求項１記載の強
誘電性液晶素子。(2) The ferroelectric liquid crystal element according to claim 1, wherein the scanning signal is periodically and sequentially applied to the scanning signal lines, and has a period in which the pulse is simultaneously applied to at least two or more scanning signal lines.
インとを有するマトリクス電極間に挟持した強誘電性液
晶素子において、走査信号および情報信号を走査信号ラ
インおよび情報信号ラインに印加して強誘電性液晶素子
を駆動する方法であって、情報信号が制御位相部と補助
位相部とから成る複数のパルスにより構成され、かつ走
査信号がこの情報信号の少なくとも１つの補助位相部の
パルスを補償する位相のパルスを有することを特徴とす
る強誘電性液晶素子の駆動方法。(3) In a ferroelectric liquid crystal element in which a ferroelectric liquid crystal material is sandwiched between matrix electrodes having a scanning signal line and an information signal line, a scanning signal and an information signal are applied to the scanning signal line and the information signal line. A method for driving a dielectric liquid crystal element, wherein the information signal is constituted by a plurality of pulses consisting of a control phase part and an auxiliary phase part, and the scanning signal compensates for the pulses of at least one auxiliary phase part of the information signal. 1. A method of driving a ferroelectric liquid crystal element, characterized by having a pulse having a phase of .
加され、少なくとも２本以上の走査信号ラインに同時に
パルスが印加されている期間を有する請求項３記載の強
誘電性液晶素子の駆動方法。(4) The method of driving a ferroelectric liquid crystal element according to claim 3, wherein the scanning signal is periodically applied to the scanning signal lines in sequence, and has a period in which pulses are simultaneously applied to at least two or more scanning signal lines. .
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1101733A JP2652886B2 (en) | 1989-04-24 | 1989-04-24 | Driving method of liquid crystal device |
| AT90107631T ATE125380T1 (en) | 1989-04-24 | 1990-04-23 | LIQUID CRYSTAL DISPLAY. |
| EP90107631A EP0394903B1 (en) | 1989-04-24 | 1990-04-23 | Liquid crystal apparatus |
| ES90107631T ES2074493T3 (en) | 1989-04-24 | 1990-04-23 | LIQUID GLASS DEVICE. |
| DE69020942T DE69020942T2 (en) | 1989-04-24 | 1990-04-23 | Liquid crystal display. |
| US07/814,436 US5267065A (en) | 1989-04-24 | 1991-12-30 | Liquid crystal apparatus |
| US08/456,725 US5815130A (en) | 1989-04-24 | 1995-06-01 | Chiral smectic liquid crystal display and method of selectively driving the scanning and data electrodes |
| US08/923,464 US5815131A (en) | 1989-04-24 | 1997-09-04 | Liquid crystal apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1101733A JP2652886B2 (en) | 1989-04-24 | 1989-04-24 | Driving method of liquid crystal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02281233A true JPH02281233A (en) | 1990-11-16 |
| JP2652886B2 JP2652886B2 (en) | 1997-09-10 |
Family
ID=14308464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1101733A Expired - Fee Related JP2652886B2 (en) | 1989-04-24 | 1989-04-24 | Driving method of liquid crystal device |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0394903B1 (en) |
| JP (1) | JP2652886B2 (en) |
| AT (1) | ATE125380T1 (en) |
| DE (1) | DE69020942T2 (en) |
| ES (1) | ES2074493T3 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5734365A (en) * | 1996-01-25 | 1998-03-31 | Canon Kabushiki Kaisha | Liquid crystal display apparatus |
| US5796381A (en) * | 1994-09-28 | 1998-08-18 | Canon Kabushiki Kaisha | Driving methods for liquid crystal devices and liquid crystal apparatus |
| US5886678A (en) * | 1994-09-12 | 1999-03-23 | Canon Kabushiki Kaisha | Driving method for liquid crystal device |
| US5903251A (en) * | 1996-01-29 | 1999-05-11 | Canon Kabushiki Kaisha | Liquid crystal apparatus that changes a voltage level of a correction pulse based on a detected temperature |
| US6018330A (en) * | 1995-04-28 | 2000-01-25 | Canon Kabushiki Kaisha | Liquid crystal display apparatus |
| US6061044A (en) * | 1995-05-30 | 2000-05-09 | Canon Kabushiki Kaisha | Liquid-crystal display apparatus |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6271817B1 (en) | 1991-03-20 | 2001-08-07 | Seiko Epson Corporation | Method of driving liquid crystal display device that reduces afterimages |
| JP3227197B2 (en) * | 1991-06-18 | 2001-11-12 | キヤノン株式会社 | Display device |
| GB2271011A (en) * | 1992-09-23 | 1994-03-30 | Central Research Lab Ltd | Greyscale addressing of ferroelectric liquid crystal displays. |
| KR0147590B1 (en) * | 1994-06-03 | 1998-12-01 | 윤종용 | Matrix type lcd drive apparatus and method |
| WO1999021161A2 (en) * | 1997-10-20 | 1999-04-29 | Koninklijke Philips Electronics N.V. | Display device |
| DE102011007493B4 (en) * | 2011-04-15 | 2015-07-02 | BMG Gesellschaft für moderne Informationssysteme mbH | Liquid crystal display and method for its control |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63306425A (en) * | 1987-06-08 | 1988-12-14 | Canon Inc | Liquid crystal device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4709995A (en) * | 1984-08-18 | 1987-12-01 | Canon Kabushiki Kaisha | Ferroelectric display panel and driving method therefor to achieve gray scale |
| JP2505756B2 (en) * | 1986-07-22 | 1996-06-12 | キヤノン株式会社 | Driving method of optical modulator |
| JP2768421B2 (en) * | 1987-08-31 | 1998-06-25 | シャープ株式会社 | Display method of ferroelectric liquid crystal display device |
-
1989
- 1989-04-24 JP JP1101733A patent/JP2652886B2/en not_active Expired - Fee Related
-
1990
- 1990-04-23 EP EP90107631A patent/EP0394903B1/en not_active Expired - Lifetime
- 1990-04-23 DE DE69020942T patent/DE69020942T2/en not_active Expired - Fee Related
- 1990-04-23 AT AT90107631T patent/ATE125380T1/en active
- 1990-04-23 ES ES90107631T patent/ES2074493T3/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63306425A (en) * | 1987-06-08 | 1988-12-14 | Canon Inc | Liquid crystal device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886678A (en) * | 1994-09-12 | 1999-03-23 | Canon Kabushiki Kaisha | Driving method for liquid crystal device |
| US5796381A (en) * | 1994-09-28 | 1998-08-18 | Canon Kabushiki Kaisha | Driving methods for liquid crystal devices and liquid crystal apparatus |
| US6018330A (en) * | 1995-04-28 | 2000-01-25 | Canon Kabushiki Kaisha | Liquid crystal display apparatus |
| US6061044A (en) * | 1995-05-30 | 2000-05-09 | Canon Kabushiki Kaisha | Liquid-crystal display apparatus |
| US5734365A (en) * | 1996-01-25 | 1998-03-31 | Canon Kabushiki Kaisha | Liquid crystal display apparatus |
| US5903251A (en) * | 1996-01-29 | 1999-05-11 | Canon Kabushiki Kaisha | Liquid crystal apparatus that changes a voltage level of a correction pulse based on a detected temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69020942T2 (en) | 1995-11-23 |
| DE69020942D1 (en) | 1995-08-24 |
| EP0394903A2 (en) | 1990-10-31 |
| JP2652886B2 (en) | 1997-09-10 |
| ES2074493T3 (en) | 1995-09-16 |
| EP0394903B1 (en) | 1995-07-19 |
| ATE125380T1 (en) | 1995-08-15 |
| EP0394903A3 (en) | 1991-09-18 |
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