JP2652886B2 - Driving method of liquid crystal device - Google Patents
Driving method of liquid crystal deviceInfo
- Publication number
- JP2652886B2 JP2652886B2 JP1101733A JP10173389A JP2652886B2 JP 2652886 B2 JP2652886 B2 JP 2652886B2 JP 1101733 A JP1101733 A JP 1101733A JP 10173389 A JP10173389 A JP 10173389A JP 2652886 B2 JP2652886 B2 JP 2652886B2
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- phase
- scanning
- liquid crystal
- driving method
- 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.)
- Expired - Fee Related
Links
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、カイラルスメクチック液晶物質を用いた液
晶装置の駆動方法に関する。The present invention relates to a method for driving a liquid crystal device using a chiral smectic liquid crystal substance.
［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（Clark）及
びラガーウォール（Lagerwall）の両者により特開昭56
−107216号公報、米国特許第4367924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
強誘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TN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、かなり本質的な
改善が得られる。[Prior Art] In recent years, as an improved type of a conventional TN type liquid crystal device, the use of a liquid crystal device having bistability has been disclosed in both Clark and Lagerwall by Japanese Patent Laid-Open No.
-107216 and U.S. Pat. No. 4,367,924. Generally, a ferroelectric liquid crystal having a chiral smectic C phase (SmC *) or an H phase (SmH *) is used as the bistable liquid crystal. This liquid crystal has a bistable state composed of first and second optically stable states with respect to an electric field. Therefore, unlike the optical modulation element used in the above-mentioned TN type liquid crystal, for example, one electric field vector In contrast, the liquid crystal is oriented in the first optically stable state, and the liquid crystal is oriented in the second optically stable state for the other electric field vector. In addition, the liquid crystal element has a property of rapidly taking one of the above two stable states in response to an applied electric field and maintaining the state when no electric field is applied. By utilizing such properties, a substantial improvement can be obtained for many of the problems of the conventional TN-type device described 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、S1′〜S4′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s1〜s4に対応した走査信号、
I1′およびS2′は情報信号ラインi1およびi2に対応した
情報信号、（I1′−S3′）および（I2′−S2′）は波形
I1′とS3′およびI2′とS2′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。In addition, many driving methods for driving such a bistable ferroelectric liquid crystal element in a matrix have been proposed. FIG. 4 shows the waveforms of the driving signals in one example. S 1 ′ to S 4 ′ are scanning signals corresponding to the scanning signal lines s 1 to s 4 in the case of the display pattern as shown in FIG.
I 1 ′ and S 2 ′ are information signals corresponding to the information signal lines i 1 and i 2 , and (I 1 ′ −S 3 ′) and (I 2 ′ −S 2 ′) are waveforms.
The composite waveforms of I 1 ′ and S 3 ′ and I 2 ′ and S 2 ′ are shown as time-series waveforms. This driving waveform is a driving method of a type in which all pixels on a selected scanning line are written once to “black”, and then “black” is held or “white” is written according to information. Are devised so as to reduce "flicker" during matrix driving.
［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-mentioned 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) Although the response speed of the liquid crystal itself is faster than that of the conventional nematic liquid crystal, the frame frequency in the case of matrix driving is slow.
（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 allowable range of the voltage value or pulse width of the drive pulse that can be matrix-driven, 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、S1″〜S4″およびI1″,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。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。Therefore, as an improved type for the problem (1), as shown in FIG. 5, a driving method for increasing the frame frequency by providing an overlap in the scanning line selection period has been proposed. In the figure, S 1 ″ to S 4 ″ and I 1 ″, I 2 ″ are the fourth
2 shows a scanning signal and an information signal in the same case as in the drawing. In this driving method, the frame frequency can be increased 1.5 times as compared with the driving method shown in FIG. However, the drive margin described in the problem (2) tends to further decrease, and it is difficult to achieve both a high frame frequency and a sufficient 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、カイラルスメクチック液晶を用いた液晶装置の駆動
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。An object of the present invention is to provide a method for driving a liquid crystal device using a chiral smectic liquid crystal, which achieves both higher frame frequency and secures a driving margin, in view of the problems of the related art.
［課題を解決するための手段］ この目的を達成するため本発明では、走査信号ライン
群と情報信号ライン群との間にカイラルスメクチック液
晶物質を挟持した液晶素子の走査信号ラインを順次選択
するとともに選択期間内に情報信号ラインに情報信号を
供給して、選択された走査信号ライン上の画素を消去位
相部にて所定の状態に消去し制御位相部にてその状態を
保持又は反転させることにより画素の表示状態を定める
液晶装置の駆動方法において、情報信号は、表示情報に
応じて極性が定められる制御位相部のパルスと、制御位
相部のパルスと逆の極性で且つそれより短いパルス幅を
有し制御位相部のパルスに続いて供給される補助位相部
のパルスとを備え、走査信号ラインを選択する為の走査
選択信号は、消去位相部のパルスと、消去位相部のパル
スとは逆極性の制御位相部のパルスと、制御位相部のパ
ルスと逆極性の補助位相部のパルスとを備えており、消
去状態を保持すべき画素に印加される合成電圧は、制御
位相部から補助位相部にかけて同一極性の電圧が連続し
ない波形を有していることを特徴としている。走査選択
信号は、少なくとも２本以上の走査信号ラインに同時に
供給される期間を有している。Means for Solving the Problems In order to achieve this object, according to the present invention, a scanning signal line of a liquid crystal element having a chiral smectic liquid crystal material sandwiched between a scanning signal line group and an information signal line group is sequentially selected and By supplying an information signal to the information signal line within the selection period, erasing pixels on the selected scanning signal line to a predetermined state in the erasing phase unit, and holding or inverting that state in the control phase unit In the method of driving a liquid crystal device that determines a display state of a pixel, the information signal includes a pulse of a control phase part whose polarity is determined according to display information, and a pulse width opposite to the pulse of the control phase part and shorter than that. A scanning phase selection signal for selecting a scanning signal line includes a pulse of an erasing phase section and a pulse of an erasing phase. A pulse of a control phase part having a polarity opposite to that of the phase part pulse and a pulse of an auxiliary phase part having a polarity opposite to that of the control phase part are provided. The characteristic feature is that a voltage having the same polarity is not continuous from the control phase section to the auxiliary phase section. The scan selection signal has a period that is simultaneously supplied to at least two or more scan signal lines.
ここで、「制御位相部」とは、消去位相部において消
去した後に、その状態を保持するか、あるいは反転させ
るかを定める位相の部分であり、情報信号においては、
制御位相部の極性が、表示すべき情報に応じて定められ
る。また、「補助位相部」とは、非選択画素にDC成分が
連続して長い期間印加されないように、制御位相部のパ
ルスとは逆極性のパルスを印加する期間である。このパ
ルスは、制御位相部のパルスとは異なり、合成電圧波形
がしきい値を越えないような電圧値を有するため、定め
るべき表示状態（白又は黒）には基本的には影響を与え
ない。Here, the “control phase section” is a phase portion that determines whether to maintain or reverse the state after erasing in the erasing phase section, and in the information signal,
The polarity of the control phase unit is determined according to the information to be displayed. The “auxiliary phase unit” is a period during which a pulse having a polarity opposite to that of the pulse of the control phase unit is applied so that the DC component is not continuously applied to the non-selected pixels for a long time. Since this pulse has a voltage value such that the composite voltage waveform does not exceed the threshold value unlike the pulse of the control phase section, it does not basically affect the display state (white or black) to be determined. .
［作用］ この構成において、情報信号の補助位相部のパルスは
画像のちらつき等を軽減するのに必要であるが、そのパ
ルスに起因して、消去状態を保持すべき画素に印加され
る合成電圧が、制御位相部から補助位相部にかけて同一
極性の電圧が連続した波形を有するとすると、その補助
位相部の電圧により、該画素が不本意に反転しやすくな
る。これにより、駆動マージンが悪化する。この悪化の
傾向は、フレーム周波数を高めるほど強くなる。しか
し、本発明では、走査選択信号が、制御位相部のパルス
と逆極性の補助位相部のパルスを備え、これにより、消
去状態を保持すべき画素に印加される合成電圧は、制御
位相部から補助位相部にかけて同一極性の電圧が連続し
ない波形を有しているため、該画素の反転が抑えられ、
駆動マージンが大きく向上する。したがって、走査選択
信号を２本以上の走査信号ラインに同時に供給してフレ
ーム周波数を高めても、十分な駆動マージンが確保され
る。[Operation] In this configuration, the pulse of the auxiliary phase portion of the information signal is necessary to reduce the flickering of the image, etc., but the composite voltage applied to the pixels to be kept in the erased state due to the pulse However, assuming that a voltage of the same polarity has a continuous waveform from the control phase portion to the auxiliary phase portion, the voltage of the auxiliary phase portion makes it easy for the pixel to be inverted involuntarily. As a result, the drive margin deteriorates. This tendency of deterioration becomes stronger as the frame frequency is increased. However, in the present invention, the scan selection signal includes a pulse of the auxiliary phase part having a polarity opposite to that of the pulse of the control phase part, whereby the combined voltage applied to the pixels to be maintained in the erased state is output from the control phase part. Since the voltage having the same polarity is not continuous over the auxiliary phase portion, the inversion of the pixel is suppressed,
The driving margin is greatly improved. Therefore, even if the frame frequency is increased by simultaneously supplying the scan selection signal to two or more scan signal lines, a sufficient drive margin is secured.
［実施例］ 以下、図面を用いて本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to 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（ｃ）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t3,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t1,電圧値V1
の消去位相、パルス幅t2,電圧値−V2の制御位相、およ
びパルス幅t3,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V3は０＜V3＜V1の範囲にあり、|V3|＝|V4|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 a waveform of a drive signal in a liquid crystal element according to an embodiment of the present invention. FIG. 1 (a) shows a selection signal waveform, and FIGS. 1 (b) and 1 (c) show “white” and “black” waveforms. 4 shows an information signal waveform corresponding to image information. In FIG. (B), the pulse width t 2, the phase control the phase of the voltage value V 5, the pulse width t 3, the phase of the voltage value -V 4 are auxiliary phases. As described above, by forming the information signal into such a pulse configuration, defects in image quality such as "flicker" in non-selection are reduced. The selection signal waveform in FIG. 7A has a pulse width t 1 and a voltage value V 1
, The pulse width t 2 , the control phase of the voltage value −V 2 , and the auxiliary phase of the pulse width t 3 and the voltage value V 3 , that is, the phase for compensating the auxiliary phase of the information signal. Here, the voltage value V 3 is in the range of 0 <V 3 <V 1, | V 3 | = | V 4 | a desirably. The provision of this compensation phase is a feature of the present invention, whereby the driving 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、一斉
に黒の状態に消去されるのがよい。Further, it is preferable that the pixels on the scanning line selected in the erasing phase be simultaneously erased 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 a display as shown in FIG. 3 is performed by this driving example.
同図において、S1〜S4は第３図の走査信号ラインs1〜
s4の走査信号波形、I1およびI2は第３図の情報信号ライ
ンi1およびi2の情報信号波形、そして（I1−S3）および
（I2−S2）は情報信号波形I1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）に示すシーケンスは、フレー
ム周波数を低く設定できるので好ましいものである。In the figure, S 1 to S 4 are scanning signal lines s 1 to s 1 in FIG.
scanning signal waveform s 4, I 1 and I 2 are the information signal lines i 1 and i 2 of the information signal waveform of FIG. 3, and (I 1 -S 3) and (I 2 -S 2) the information signal waveform I 1 and a synthetic waveform and the information signal waveform I 2 and composite waveform of the scanning signal waveform S 2 scan signal waveform S 3. In particular, the sequence shown in FIG. 2A is preferable because 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デューテ
ィで駆動したところ、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 1/400 duty at room temperature in accordance with the driving example shown in FIG. 1, compared with the driving method shown in FIG.
The frame frequency has increased about 1.3 times, and the driving margin has increased by about 10%. Further, as compared with the conventional driving method shown in FIG. 5, the driving margin is increased by about 50%.
［発明の効果］ 以上説明したように本発明によれば、走査選択信号
が、制御位相部のパルスと逆極性の補助位相部のパルス
を備え、これにより、消去状態を保持すべき画素に印加
される合成電圧が、制御位相部から補助位相部にかけて
同一極性の電圧が連続しない波形を有するようにしたた
め、駆動マージンを大きく向上させることができる。し
たがって、走査選択信号を２本以上の走査信号ラインに
同時に供給してフレーム周波数を高めても、十分な駆動
マージンを確保し、駆動特性を極めて向上させることが
できる。[Effects of the Invention] As described above, according to the present invention, the scan selection signal includes a pulse of the auxiliary phase unit having a polarity opposite to that of the pulse of the control phase unit. Since the resultant voltage has a waveform in which voltages of the same polarity are not continuous from the control phase unit to the auxiliary phase unit, the driving margin can be greatly improved. Therefore, even if the frame frequency is increased by simultaneously supplying the scanning selection signal to two or more scanning signal lines, a sufficient driving margin can be secured and the driving characteristics can be significantly improved.
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、 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。1A to 1C are waveform diagrams showing waveforms of drive signals in a liquid crystal element according to an embodiment of the present invention, and FIGS. 2A and 2B are as shown in FIG. FIG. 3 is a timing chart showing a time-series waveform of a driving signal according to various driving examples, FIG. 3 is a schematic diagram illustrating a display pattern by a liquid crystal element, and FIG. 4 and FIG. 6 is a timing chart showing a waveform.
Claims (8)
間にカイラルスメクチック液晶物質を挟持した液晶素子
の該走査信号ラインを順次選択するとともに選択期間内
に該情報信号ラインに情報信号を供給して、選択された
走査信号ライン上の画素を消去位相部にて所定の状態に
消去し制御位相部にてその状態を保持又は反転させるこ
とにより該画素の表示状態を定める液晶装置の駆動方法
において、 該情報信号は、表示情報に応じて極性が定められる該制
御位相部のパルスと、該制御位相部のパルスと逆の極性
で且つそれより短いパルス幅を有し該制御位相部のパル
スに続いて供給される補助位相部のパルスと、を備え、 該走査信号ラインを選択する為の走査選択信号は、該消
去位相部のパルスと、該消去位相部のパルスとは逆極性
の該制御位相部のパルスと、該制御位相部のパルスと逆
極性の該補助位相部のパルスとを備えており、 消去状態を保持すべき画素に印加される合成電圧は、該
制御位相部から該補助位相部にかけて同一極性の電圧が
連続しない波形を有していることを特徴とする液晶装置
の駆動方法。1. A scanning signal line of a liquid crystal element having a chiral smectic liquid crystal material interposed between the scanning signal line group and the information signal line group is sequentially selected, and an information signal is supplied to the information signal line within a selection period. Then, a pixel on the selected scanning signal line is erased to a predetermined state by an erasing phase unit, and the state is held or inverted by a control phase unit, and a driving method of the liquid crystal device that determines a display state of the pixel In the information signal, a pulse of the control phase part whose polarity is determined according to display information, and a pulse of the control phase part having a polarity opposite to that of the pulse of the control phase part and having a shorter pulse width. And a pulse of an auxiliary phase unit supplied subsequently to the scan signal line, wherein the scan selection signal for selecting the scan signal line comprises a pulse of the erase phase unit and a pulse of the opposite polarity to the pulse of the erase phase unit. A pulse of the control phase section and a pulse of the auxiliary phase section having a polarity opposite to that of the pulse of the control phase section. A method for driving a liquid crystal device, wherein a voltage having the same polarity is not continuous over an auxiliary phase section.
の走査信号ラインに同時に供給される期間を有している
請求項１記載の駆動方法。2. The driving method according to claim 1, wherein the scanning selection signal has a period in which the scanning selection signal is simultaneously supplied to at least two or more scanning signal lines.
に前記走査選択信号が同時に供給され、その際、一方の
走査信号ラインには前記消去位相部のパルスが、他方に
は前記補助位相部のパルスが、同時に供給される請求項
２記載の駆動方法。3. The scanning selection signal is simultaneously supplied to two scanning signal lines during the period, and one of the scanning signal lines is supplied with the pulse of the erasing phase unit and the other is supplied with the auxiliary signal. 3. The driving method according to claim 2, wherein the pulses of the phase section are supplied simultaneously.
の供給に先立って供給され、該制御位相部のパルスとは
逆極性で且つそれより短いパルス幅を有するもう１つの
補助位相部のパルスを備えている請求項１記載の駆動方
法。4. The information signal is supplied prior to the supply of a pulse of the control phase part, and the information signal is supplied to another auxiliary phase part having a polarity opposite to that of the control phase part and having a shorter pulse width. The driving method according to claim 1, further comprising a pulse.
りと、そのパルスと合成される前記消去位相部のパルス
の立下りとが一致している請求項４記載の駆動方法。5. The driving method according to claim 4, wherein a falling edge of a pulse of said another auxiliary phase part coincides with a falling edge of a pulse of said erasing phase part combined with said pulse.
スの電圧値は、前記消去位相部のパルスの電圧値より小
さい請求項１記載の駆動方法。6. The driving method according to claim 1, wherein the voltage value of the pulse of the auxiliary phase portion of the scan selection signal is smaller than the voltage value of the pulse of the erasing phase portion.
スの電圧値は、前記情報信号の前記補助位相部の電圧値
に等しい請求項１または６記載の駆動方法。7. The driving method according to claim 1, wherein a voltage value of a pulse of the auxiliary phase portion of the scan selection signal is equal to a voltage value of the auxiliary phase portion of the information signal.
である請求項１記載の駆動方法。8. The driving method according to claim 1, wherein the display state of the pixel in the erased state is black.
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. |
| DE69020942T DE69020942T2 (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. |
| 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 JPH02281233A (en) | 1990-11-16 |
| JP2652886B2 true 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) |
Families Citing this family (12)
| 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 |
| DE69524013T2 (en) * | 1994-09-12 | 2002-06-06 | Canon Kk | Control for a ferroelectrical liquid crystal device |
| JP3286503B2 (en) * | 1994-09-28 | 2002-05-27 | キヤノン株式会社 | Driving method of liquid crystal element and liquid crystal device using the driving method |
| 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 |
| EP0946937A2 (en) * | 1997-10-20 | 1999-10-06 | 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 |
Family Cites Families (4)
| 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 |
| JP2531683B2 (en) * | 1987-06-08 | 1996-09-04 | キヤノン株式会社 | Liquid crystal device |
| 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 AT AT90107631T patent/ATE125380T1/en active
- 1990-04-23 ES ES90107631T patent/ES2074493T3/en not_active Expired - Lifetime
- 1990-04-23 DE DE69020942T patent/DE69020942T2/en not_active Expired - Fee Related
- 1990-04-23 EP EP90107631A patent/EP0394903B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ATE125380T1 (en) | 1995-08-15 |
| EP0394903A2 (en) | 1990-10-31 |
| DE69020942T2 (en) | 1995-11-23 |
| EP0394903B1 (en) | 1995-07-19 |
| DE69020942D1 (en) | 1995-08-24 |
| ES2074493T3 (en) | 1995-09-16 |
| EP0394903A3 (en) | 1991-09-18 |
| JPH02281233A (en) | 1990-11-16 |
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