JPS6256935A - Driving method for liquid crystal matrix panel - Google Patents
Driving method for liquid crystal matrix panelInfo
- Publication number
- JPS6256935A JPS6256935A JP19801385A JP19801385A JPS6256935A JP S6256935 A JPS6256935 A JP S6256935A JP 19801385 A JP19801385 A JP 19801385A JP 19801385 A JP19801385 A JP 19801385A JP S6256935 A JPS6256935 A JP S6256935A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- pulses
- pulse
- equal
- selection period
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
-
- 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
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は強誘電性液晶を液晶層として持つ液晶マトリッ
クスパネルの駆動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 liquid crystal matrix panel having a ferroelectric liquid crystal as a liquid crystal layer.
従来の技術
近年、応答速度が速くメモリー性のある強誘電性液晶の
報告がなされている（例えば、竹添英夫、福田敦夫、久
世栄−；「工業材料」、第３１巻、第１０号、２２）。Prior Art In recent years, reports have been made on ferroelectric liquid crystals with fast response speed and memory properties (for example, Hideo Takezoe, Atsuo Fukuda, Sakae Kuze; "Industrial Materials", Vol. 31, No. 10, 22). ).
以下、図面を用いて従来の強誘電性液晶パネルの一例に
ついて説明する。第３図は従来のスメクチック液晶パネ
ルの構造を示すものである。第３図において１はガラス
基板、２はＩＴＯより成る透明電極、４は強誘電性液晶
層、６は液晶分子のＣダイレクタ−１６は双極子モーメ
ントである。An example of a conventional ferroelectric liquid crystal panel will be described below with reference to the drawings. FIG. 3 shows the structure of a conventional smectic liquid crystal panel. In FIG. 3, 1 is a glass substrate, 2 is a transparent electrode made of ITO, 4 is a ferroelectric liquid crystal layer, 6 is a C director of liquid crystal molecules, and 16 is a dipole moment.
強誘電性液晶は一般に分子長軸に垂直な方向に双極子モ
ーメントをもっており、薄膜化により自発分極を持つよ
うになる。強誘電性を示すカイラルスメクチック相の例
を用いて強誘電性液晶の表記方法を第４図に示す。第４
図（ＩＬ）は分子層の法線に対し分子長軸が＋θ度傾い
た状態、第４図（ｂ）は＝θ度傾いた状態の強誘電性液
晶の表記法である。Ferroelectric liquid crystals generally have a dipole moment in the direction perpendicular to the long axis of the molecules, and as they become thinner, they come to have spontaneous polarization. FIG. 4 shows how to describe ferroelectric liquid crystal using an example of a chiral smectic phase exhibiting ferroelectricity. Fourth
Figure 4 (IL) shows a state in which the long axis of the molecules is tilted by +θ degrees with respect to the normal to the molecular layer, and FIG.
７は層の法線、８は分子の長軸方向ｎ、９は双極子モー
メン）Ｐｓ、１０はｎをＸ７平面上に投影した時のＣダ
イレクタ−Ｃ９１１は分子長軸の法線に対する傾き角±
θ度である。以上のような構造を持つ強誘電性液晶パネ
ルについて、以下その動作原理について図を参照しなが
ら説明する。7 is the normal to the layer, 8 is the long axis direction of the molecule (n, 9 is the dipole moment) Ps, 10 is the C director when n is projected onto the X7 plane - C911 is the inclination angle with respect to the normal to the long axis of the molecule ±
It is θ degrees. The operating principle of the ferroelectric liquid crystal panel having the above structure will be explained below with reference to the drawings.
第６図に従来の強誘電性液晶パネルの表示方法の原理図
を示す。１２は層法線に対して分子長軸が＋θ度傾いた
液晶分子、１３は一〇度傾いた液晶分子、１４は紙面表
方向の双極子モーメント、１６は紙面裏方向の双極子モ
ーメント、１６は２枚の偏光板の方向である。さて、第
５図ｅ）は電圧無印加の状態、第６図中）は紙面表から
裏へ正の電圧を印加した場合、第５図（０）は紙面裏か
ら表へ正の電圧を印加した場合の動作原理である。この
ように電圧の印加方向によりセル全体が±θ度傾いた２
つの状態をとり、したがって、電気光学効果による複屈
折または２色性を利用すれば明暗を表すことができる。FIG. 6 shows a principle diagram of a conventional ferroelectric liquid crystal panel display method. 12 is a liquid crystal molecule whose long axis of the molecule is tilted by +θ degrees with respect to the layer normal, 13 is a liquid crystal molecule which is tilted by 10 degrees, 14 is a dipole moment in the direction of the front of the paper, 16 is a dipole moment in the direction of the back of the paper, 16 is the direction of the two polarizing plates. Now, Fig. 5 e) shows a state in which no voltage is applied, Fig. 6 (middle) shows a case in which a positive voltage is applied from the front to the back of the paper, and Fig. 5 (0) shows a state in which a positive voltage is applied from the back to the front of the paper. This is the operating principle when In this way, the entire cell is tilted by ±θ degrees depending on the direction of voltage application.
Therefore, brightness and darkness can be expressed by using birefringence or dichroism due to the electro-optic effect.
以上が強誘電性液晶パネルの表示原理だが、マトリック
ス駆動法としては、従来の電圧平均化法を少し変更した
駆動法がある。第６図はその一例で、２つのフィールド
からなり、１／４アイアスの電圧平均化法に基すいた波
形を、フィールド毎にパルスの極性及び、オン電圧とオ
フ電圧を逆転させている。オン電圧Ｖｄでは反転するが
オフ電圧ｖｄ−２・ｖｈでは反転しない。したがってオ
ン状態は第１フイールドで設定され、オフ状態は第２フ
イールドで設定されている。（例えば、原理、出口、居
住、甲斐：ニス・アイ・ディ′８５ダイジェスト、１９
８５年、１３５頁（Ｔ。The above is the display principle of a ferroelectric liquid crystal panel, but as a matrix drive method, there is a drive method that is slightly modified from the conventional voltage averaging method. FIG. 6 is an example of such a waveform, which consists of two fields and is based on the 1/4 Ijas voltage averaging method, with the pulse polarity and the on-voltage and off-voltage reversed for each field. It is inverted at the on-voltage Vd, but not at the off-voltage vd-2·vh. Therefore, the on state is set in the first field, and the off state is set in the second field. (For example, principle, exit, residence, Kai: Niss.I.D.'85 Digest, 19
1985, p. 135 (T.
ＨＡＲＡＤム、Ｍ、ＴＡＧＵＣＨＩ、に、ＩＷＡＳ人。HARADMU, M, TAGUCHI, IWAS person.
Ｍ、にムＩ：ＳＩＤ’ｓｓ Ｄｉｇｅｓｔ（１ｓｓｓ）
ｐ、１３１〕
発明が解決しようとする問題点
上記従来の方法ではオフ状態は第２フイールドで設定さ
れるので、オフ絵素は第１フイールドでは１つ前のフレ
ームの絵素状態が残っているので、１フィールド時間誤
った表示が行われることになる。これは液晶の応答速度
の限界と高デユーティ−駆動のため１フイ一ルド時間が
長いときや、動画を表示するときは視覚に捉えられるの
で見にくい表示となる。M, Nimu I: SID'ss Digest (1sss)
[Page 131] Problems to be Solved by the Invention In the above conventional method, the off state is set in the second field, so the off picture element remains in the picture element state of the previous frame in the first field. Therefore, an incorrect display will be performed for one field time. This is visually noticeable when one field takes a long time due to the limited response speed of the liquid crystal and high duty driving, or when displaying a moving image, resulting in a display that is difficult to see.
問題点を解決するための手段
上記問題点を解決するために本発明の液晶マトリックス
表示パネルの駆動法は、対向面に電極を有する一対の基
板間に強誘電性液晶を挾持し、マトリックス状の絵素を
形成する液晶マトリックスパネルの駆動法において、走
査電極の１回の選択期間に４つのパルス電圧が絵素に印
加され、第１と第２のパルスおよび第３と第４のパルス
はそれぞれパルス幅が等しく、電圧値の絶対値が等しい
が極性が逆であり、第１と第３のパルスの極性も逆であ
り、第１と第２のパルス電圧値か第３と第４のパルス電
圧値のいずれか一方は閾値電圧以上で、他方は閾値電圧
以下であることを特徴とするマトリックスパネルの駆動
法を与えるものである。Means for Solving the Problems In order to solve the above-mentioned problems, the method for driving a liquid crystal matrix display panel of the present invention involves sandwiching a ferroelectric liquid crystal between a pair of substrates having electrodes on opposing surfaces. In a driving method for a liquid crystal matrix panel that forms picture elements, four pulse voltages are applied to the picture elements during one selection period of the scanning electrode, and the first and second pulses, and the third and fourth pulses are The pulse widths are equal, the absolute values of the voltage values are equal but the polarities are opposite, the polarities of the first and third pulses are also opposite, and the voltage values of the first and second pulses or the third and fourth pulses are the same. The present invention provides a method for driving a matrix panel characterized in that one of the voltage values is greater than or equal to a threshold voltage and the other is less than or equal to the threshold voltage.
また、上記４つのパルスの順序は入れ替えてもよい。Furthermore, the order of the four pulses may be changed.
作用
強誘電性液晶も他の液晶同様、劣化を防ぐため交流波形
を加えなければならない。しかし、パルスの極性により
分子の反転の方向が変るので、通常の電圧平均化法のフ
ィールド内入Ｃ法は使えない。本発明の駆動法では１回
の走査電極の選択期間に２組のＡＣパルスをパネルに印
加し、一方の組が閾値電圧以上の反転パルス群であれば
、他方の組を閾値電圧以下の非反転パルス群にし、かつ
、それぞれの組の最後のパルスの極性を逆にすることに
より、完全交流波形の条件を満たしながら１ラインの絵
素を１回の選択期間で所望の光透過状態にしている。Like other liquid crystals, ferroelectric liquid crystals must be subjected to alternating current waveforms to prevent deterioration. However, since the direction of molecular inversion changes depending on the polarity of the pulse, the in-field C method, which is a normal voltage averaging method, cannot be used. In the driving method of the present invention, two sets of AC pulses are applied to the panel during one scanning electrode selection period. By creating a group of inverted pulses and reversing the polarity of the last pulse of each set, one line of picture elements can be made into the desired light transmitting state in one selection period while satisfying the conditions of a complete AC waveform. There is.
実施例 以下に実施例を示す。Example Examples are shown below.
本実施例で用いた液晶はエステル系の強誘電性液晶の混
合物で、配向はラビング法により行い、基板間距離は約
３．５μｍである。第１図は本発明の駆動法の１例であ
る。第１図（＆）は走査電極、信号電極に印加される電
圧、第１図（ｂ）はパネルに印加される電圧を表す。第
１図において、ｖｏ＝２０ボルト、τ。＝４００１１Ｓ
ｆ３０．バイアス比１／ａ＝ ７ ／ ２０ 、 デ
ユーティ−比１ ／ ５００の条件で良好なコン上ラス
トの表示が見られた。第２図は本駆動波形と絵素の透過
光量の変化の様子を表している。The liquid crystal used in this example was a mixture of ester-based ferroelectric liquid crystals, and the alignment was performed by a rubbing method, and the distance between the substrates was about 3.5 μm. FIG. 1 is an example of the driving method of the present invention. FIG. 1(&) represents the voltages applied to the scanning electrodes and signal electrodes, and FIG. 1(b) represents the voltages applied to the panel. In FIG. 1, vo=20 volts, τ. =40011S
f30. A good display of last on the monitor was observed under the conditions of bias ratio 1/a=7/20 and duty ratio 1/500. FIG. 2 shows the actual drive waveform and the change in the amount of light transmitted through the picture element.
発明の効果
本発明の液晶マ） ＩＪフックスネルの駆動法により、
液晶を劣化させない交流波形により、１回の走査で絵素
の状態を確定することができる。これにより大面積の液
晶パネルを高時分割駆動するとき、また動画を表示する
ときでも高品位の表示ができる。Effects of the Invention The liquid crystal display of the present invention has the following advantages:
Using an AC waveform that does not deteriorate the liquid crystal, it is possible to determine the state of the picture element with one scan. This enables high-quality display even when driving a large-area liquid crystal panel in multiple time divisions or when displaying moving images.
第１図は本発明の液晶マトリックス表示パネルの駆動法
の例を走査電圧、信号電圧を選択、非選択の場合に分け
て示した信号波形図、第２図は本発明の駆動法の実際の
駆動波形図および、透過光量を表している図、第３図は
強誘電性液晶パネルの断面図、第４図はカイラルスメク
チックＣ液晶の表記法を示す模式図、第５図は従来の強
誘電性液晶パネルの表示の原理を示す原理図、第６図は
従来の強誘電性液晶マトリックス表示パネルの駆動法の
１例の波形図である。
１・・・・・・ガラス基板、２・・・・・・透明電極、
３・・・・・・配向膜、４・・・・・・強誘電性液晶層
、５・・・・・・液晶分子のＣダイレクタ−１６・・・
・・・双極子モーメント、７・・・・・・層の法線、８
・・・・・・分子の長軸方向ｎ、９・・・・・・双極子
モーメント、１ｏ・・・・・・Ｃダイレクタ−１１１・
・・・・・分子長軸の層法線に対する傾き角１０度、１
２・・・・・・層法線に対して分子長軸が＋θ度傾いた
液晶分子、１３・・・・・・−θ度傾いた液晶分子、１
４・・・・・・紙面表方向の双極子モーメント、１５・
・・・・・紙面裏方向の双極子モーメント、１６・・・
・・・２枚の偏光板の方向。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第
１ 図
（ｂ）
第２図
（ｏ−〕Ｌ倉ｔＬ
＜ｂｒ信号ｔｉ
（０））鴎ツメｐ加甑
第３図
第４図
第５図
（α）FIG. 1 is a signal waveform diagram showing an example of the driving method of the liquid crystal matrix display panel of the present invention, with the scanning voltage and signal voltage being selected and unselected, and FIG. 2 is a signal waveform diagram showing the actual driving method of the present invention. Figure 3 is a cross-sectional view of a ferroelectric liquid crystal panel, Figure 4 is a schematic diagram showing the notation of chiral smectic C liquid crystal, and Figure 5 is a diagram showing the amount of transmitted light. FIG. 6 is a waveform diagram of an example of a driving method for a conventional ferroelectric liquid crystal matrix display panel. 1...Glass substrate, 2...Transparent electrode,
3... Alignment film, 4... Ferroelectric liquid crystal layer, 5... C director of liquid crystal molecules 16...
...Dipole moment, 7...Normal of layer, 8
......Long axis direction of molecule n, 9...Dipole moment, 1o...C director-111.
・・・・Inclination angle of the long axis of the molecule to the layer normal 10 degrees, 1
2...Liquid crystal molecule whose long axis of the molecule is tilted by +θ degrees with respect to the layer normal, 13...Liquid crystal molecule whose molecular axis is tilted by -θ degrees, 1
4...Dipole moment in the direction of the surface of the paper, 15.
...Dipole moment toward the back of the paper, 16...
...Direction of the two polarizing plates. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Fig. (b) Fig. 2 (o-]L tL <br signal ti (0)) Kamotsume p addition Fig. 3 Fig. 4 Fig. 5 (α)
Claims (3)
晶を挾持し、マトリックス状の絵素を形成する液晶マト
リックスパネルの駆動法において、走査電極の１回の選
択期間に４つのパルス電圧が絵素に印加され、第１と第
２のパルスおよび第３と第４のパルスはそれぞれパルス
幅が等しく、電圧値の絶対値が等しいが極性が逆であり
、第１と第３のパルスの極性も逆であり、前記第１と第
２のパルス電圧値が前記第３と第４のパルス電圧値のい
ずれか一方は閾値電圧以上で、他方は閾値電圧以下であ
ることを特徴とする液晶マトリックスパネルの駆動法。(1) In a driving method for a liquid crystal matrix panel in which a ferroelectric liquid crystal is sandwiched between a pair of substrates having electrodes on opposing surfaces to form a matrix of picture elements, four pulses are applied during one selection period of the scanning electrode. A voltage is applied to the picture element, and the first and second pulses and the third and fourth pulses have equal pulse widths, the absolute values of the voltage values are equal, but the polarity is opposite, and the first and third pulses The polarity of the pulses is also opposite, and one of the first and second pulse voltage values and the third and fourth pulse voltage values is equal to or higher than a threshold voltage, and the other is equal to or lower than the threshold voltage. Driving method of liquid crystal matrix panel.
変えたことを特徴とする特許請求の範囲第１項記載のマ
トリックスパネルの駆動法。(2) The method for driving a matrix panel according to claim 1, characterized in that the order of the first, second, third, and fourth four pulses is changed.
スは絶対値が常に一定であることを特徴とする特許請求
の範囲第１項記載の液晶マトリックスパネルの駆動法。(3) The method for driving a liquid crystal matrix panel according to claim 1, wherein the absolute value of the pulse applied to the panel during the non-selection period of the scanning electrode is always constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19801385A JPS6256935A (en) | 1985-09-06 | 1985-09-06 | Driving method for liquid crystal matrix panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19801385A JPS6256935A (en) | 1985-09-06 | 1985-09-06 | Driving method for liquid crystal matrix panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6256935A true JPS6256935A (en) | 1987-03-12 |
Family
ID=16384057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19801385A Pending JPS6256935A (en) | 1985-09-06 | 1985-09-06 | Driving method for liquid crystal matrix panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6256935A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01201625A (en) * | 1988-02-08 | 1989-08-14 | Seiko Epson Corp | Driving method for liquid crystal element |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0137726A2 (en) * | 1983-09-10 | 1985-04-17 | Stc Plc | Addressing liquid crystal displays |
| JPS60123825A (en) * | 1983-12-09 | 1985-07-02 | Seiko Instr & Electronics Ltd | Liquid crystal display element |
| JPS61230197A (en) * | 1985-04-04 | 1986-10-14 | 株式会社精工舎 | Driving of electrooptic display unit |
-
1985
- 1985-09-06 JP JP19801385A patent/JPS6256935A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0137726A2 (en) * | 1983-09-10 | 1985-04-17 | Stc Plc | Addressing liquid crystal displays |
| JPS60123825A (en) * | 1983-12-09 | 1985-07-02 | Seiko Instr & Electronics Ltd | Liquid crystal display element |
| JPS61230197A (en) * | 1985-04-04 | 1986-10-14 | 株式会社精工舎 | Driving of electrooptic display unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01201625A (en) * | 1988-02-08 | 1989-08-14 | Seiko Epson Corp | Driving method for liquid crystal element |
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