JP2621274B2 - Driving method of liquid crystal matrix panel - Google Patents
Driving method of liquid crystal matrix panelInfo
- Publication number
- JP2621274B2 JP2621274B2 JP285488A JP285488A JP2621274B2 JP 2621274 B2 JP2621274 B2 JP 2621274B2 JP 285488 A JP285488 A JP 285488A JP 285488 A JP285488 A JP 285488A JP 2621274 B2 JP2621274 B2 JP 2621274B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- selection period
- matrix panel
- pulse
- 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
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
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。Description: TECHNICAL FIELD 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 従来の強誘電性液晶マトリックスパネルの駆動法とし
ては、例えば、ネマチック液晶で用いるフィールド内AC
法を極性を代えて２フィールド繰り返す第３図の駆動法
や、また１回の選択期間に４つのパルスを印加する第４
図の駆動法、また、非選択期間の最初のパルスの影響を
小さくするために休止位相を挿入した第５図の駆動法な
どがある（例えば、脇田ら：ナショナル テクニカル
レポート（National Technical Report）Vol.33,No.1,1
987年,44頁や特開昭60−56935号公報等）。2. Description of the Related Art Conventional methods of driving a ferroelectric liquid crystal matrix panel include, for example, an intra-field AC used in a nematic liquid crystal.
The driving method shown in FIG. 3 in which the method is repeated two fields while changing the polarity, and the fourth method in which four pulses are applied in one selection period
The driving method shown in FIG. 5 and the driving method shown in FIG. 5 in which a rest phase is inserted to reduce the influence of the first pulse in the non-selection period (for example, Wakita et al .: National Technical
Report (National Technical Report) Vol.33, No.1,1
987, p. 44 and JP-A-60-56935.
発明が解決しようとする課題 強誘電性液晶では、分子の動き易さはパルスの電圧値
とパルス幅に依存するため、液晶の応答は単一のパルス
のみで決まるのではなく、近接したパルスの影響を受け
る。上記従来の方法では、非選択期間の最初のパルスの
極性および電圧は選択期間の絵素データとは独立なの
で、選択期間の最後のパルスと前記パルスの極性が同極
性の場合と逆極性の場合とで、選択された絵素の輝度に
差が出るため、パターンによって表示コントラストに差
が出て、表示むらが生じる。これを緩和するために、第
５図の駆動法では休止位相を挿入したが、短い休止位置
では効果は少なかった。Problems to be Solved by the Invention In a ferroelectric liquid crystal, the ease of movement of molecules depends on the voltage and pulse width of the pulse, so the response of the liquid crystal is not determined by a single pulse, but rather by a close pulse. to be influenced. In the above conventional method, the polarity and voltage of the first pulse in the non-selection period are independent of the pixel data in the selection period. Then, since the luminance of the selected picture element is different, the display contrast is different depending on the pattern, and display unevenness occurs. In order to alleviate this, a rest phase was inserted in the driving method shown in FIG. 5, but the effect was small at a short rest position.
課題を解決するための手段 上記課題を解決するために本発明の液晶マトリックス
パネルの駆動法は、対抗面に電極を有する一対の基板間
に強誘電性液晶を挟持し、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
極の選択期間と信号電極の選択期間が同期していないこ
とを特徴とする液晶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 problems, a method of driving a liquid crystal matrix panel according to the present invention comprises sandwiching a ferroelectric liquid crystal between a pair of substrates having electrodes on opposing surfaces, and forming a matrix-shaped picture element. The present invention provides a driving method of a liquid crystal matrix panel, wherein a selection period of a scanning electrode and a selection period of a signal electrode are not synchronized in a driving method of a liquid crystal matrix panel to be formed.
作用 走査電極の選択期間と信号電極の選択期間を同期させ
ないことにより、信号電極の選択期間が、書き込みパル
スが印加される走査電極の選択期間の後半と非選択期間
の始めに跨がり、書き込みパルスと、非選択期間の最初
のパルスに相関が出来るので、パターンに依存した輝度
むらをなくす事が出来る。具体的には、書き込みパルス
で絵素を反転させたいときには、非選択期間の最初のパ
ルスは、書き込みパルスと同極性にし、反転させたくな
い時には、書き込みパルスと逆極性にすればよい。Function By not synchronizing the selection period of the scanning electrode and the selection period of the signal electrode, the selection period of the signal electrode extends over the latter half of the selection period of the scanning electrode to which the write pulse is applied and the beginning of the non-selection period, and the write pulse And the first pulse in the non-selection period can be correlated, so that the luminance unevenness depending on the pattern can be eliminated. Specifically, when it is desired to invert a picture element by a write pulse, the first pulse in the non-selection period may have the same polarity as the write pulse, and when it is not desired to invert, the polarity may be opposite to the write pulse.
実施例 以下本発明の一実施例の液晶マトリックスパネルの駆
動法について、図面を参照しながら説明する。Embodiment Hereinafter, a driving method of a liquid crystal matrix panel according to an embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の駆動法の波形を示した図で、第１図
（ａ）の様なパターンを表示した時の走査電極及び信号
電極に印加した電圧を第１図（ｂ）に、そのとき絵素に
印加された電圧を第１図（ｃ）に示した。用いたパネル
は、エステル系の強誘電性液晶を用いた液晶層の厚さ2.
5μｍの表面安定化強誘電性液晶マトリックスパネルで
ある。１選択期間は４つのパルスで構成されているが、
走査電極と信号電極の位相は１選択期間の1/2、２パル
ス分だけずれている。第１図（ｃ）は16の絵素の一部に
ついてだけ示しているが、波形の始まりは信号電圧の位
相にあわせてある。第１図（ｃ）において、右上がり斜
線部のパルスで絵素はリセットされ、左上がり斜線部の
書き込みパルスが閾値電圧より大きい時絵素は反転して
白になり、書き込みパルスが閾値電圧より小さい時黒に
なる。いずれのパターンにおいても、書き込みパルス＞
閾値なら、非選択期間の最初のパルスは書き込みパルス
と同極性で、書き込みパルス＜閾値電圧なら、非選択期
間の最初のパルスは書き込みパルスと同極性になってい
る。このため、従来法では起こってしまうパターンに依
存した絵素の輝度むらは見られず、また、駆動マージン
が広がるので均一でコントラストの高い表示が得られ
た。FIG. 1 is a diagram showing waveforms of the driving method according to the present invention. FIG. 1 (b) shows the voltages applied to the scanning electrodes and the signal electrodes when a pattern as shown in FIG. 1 (a) is displayed. The voltage applied to the picture element at that time is shown in FIG. The panel used has a liquid crystal layer thickness of 2.
5 μm surface stabilized ferroelectric liquid crystal matrix panel. One selection period is composed of four pulses,
The phases of the scanning electrode and the signal electrode are shifted by 1/2 of one selection period and by two pulses. FIG. 1 (c) shows only a part of the 16 picture elements, but the beginning of the waveform is aligned with the phase of the signal voltage. In FIG. 1 (c), the picture element is reset by the pulse in the shaded area rising to the right, and when the write pulse in the shaded area to the left is larger than the threshold voltage, the picture element is inverted to white, and the write pulse becomes higher than the threshold voltage. Black when small. Write pulse>
If the threshold value, the first pulse of the non-selection period has the same polarity as the write pulse, and if the write pulse <the threshold voltage, the first pulse of the non-selection period has the same polarity as the write pulse. For this reason, the luminance unevenness of the picture element depending on the pattern, which occurs in the conventional method, was not observed, and the driving margin was widened, so that a uniform and high-contrast display was obtained.
第２図は中間調を表示した時の本発明の駆動法の波形
図で、非選択期間の最初のパルスは諧調が下がるに従っ
て、書き込みパルスと同極性のパルス幅が減り逆極性の
パルス幅が段々長くなる。中間調を表示する場合は、非
選択期間のパルスの影響はより大きくなり、上記の本発
明の効果により、従来法より多くの諧調を均一に表示で
きた。FIG. 2 is a waveform diagram of the driving method according to the present invention when halftone is displayed. In the first pulse in the non-selection period, the pulse width of the same polarity as the write pulse decreases and the pulse width of the opposite polarity decreases as the gradation decreases. It gets longer gradually. In the case of displaying the halftone, the influence of the pulse in the non-selection period becomes larger, and the above-described effect of the present invention allows more gradations to be displayed uniformly than in the conventional method.
発明の効果 本発明の液晶マトリックスパネルの駆動法は、走査電
極と信号電極の選択期間の位相をずらす事により、書き
込みパルスに続く走査電極の非選択期間の最初のパルス
を選択絵素のデータに応じて変える事が出来るので、表
示パターンに依存した輝度むらがなくなり、駆動電圧の
マージンが広がってコントラストの高い表示を実現でき
るものである。According to the driving method of the liquid crystal matrix panel of the present invention, the first pulse of the non-selection period of the scanning electrode following the writing pulse is shifted to the data of the selected pixel by shifting the phase of the selection period of the scanning electrode and the signal electrode. Since the luminance can be changed according to the display pattern, the luminance unevenness depending on the display pattern is eliminated, and the margin of the driving voltage is widened, so that the display with high contrast can be realized.
第１図、第２図は本発明の一実施例の駆動波形図、第３
図から第５図は、従来例の駆動波形図である。1 and 2 are drive waveform diagrams of one embodiment of the present invention, and FIG.
FIG. 5 to FIG. 5 are driving waveform diagrams of a conventional example.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大西 博之 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 上天 一浩 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 古林 好則 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Onishi 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshinori Kobayashi 1006 Ojidoma, Kadoma, Osaka Prefecture
Claims (2)
電性液晶を挟持し、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、走査電極の選
択期間と信号電極の選択期間が同期していないことを特
徴とする液晶マトリックスパネルの駆動法。In a method of driving 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, a selection period of a scanning electrode and a selection of a signal electrode are provided. A method of driving a liquid crystal matrix panel, wherein the periods are not synchronized.
が印加され、前記選択期間と信号電極の選択期間が２パ
ルス分ずれていることを特徴とする特許請求の範囲第
（１）項に記載の液晶マトリックスパネルの駆動法。2. The method according to claim 1, wherein four pulses are applied to the picture element during the selection period of the scanning electrode, and the selection period and the selection period of the signal electrode are shifted by two pulses. The driving method of the liquid crystal matrix panel described in the paragraph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP285488A JP2621274B2 (en) | 1988-01-08 | 1988-01-08 | Driving method of liquid crystal matrix panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP285488A JP2621274B2 (en) | 1988-01-08 | 1988-01-08 | Driving method of liquid crystal matrix panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01179130A JPH01179130A (en) | 1989-07-17 |
| JP2621274B2 true JP2621274B2 (en) | 1997-06-18 |
Family
ID=11540975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP285488A Expired - Fee Related JP2621274B2 (en) | 1988-01-08 | 1988-01-08 | Driving method of liquid crystal matrix panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2621274B2 (en) |
-
1988
- 1988-01-08 JP JP285488A patent/JP2621274B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01179130A (en) | 1989-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |