JPH08110511A - Electrooptical device driving method - Google Patents
Electrooptical device driving methodInfo
- Publication number
- JPH08110511A JPH08110511A JP99595A JP99595A JPH08110511A JP H08110511 A JPH08110511 A JP H08110511A JP 99595 A JP99595 A JP 99595A JP 99595 A JP99595 A JP 99595A JP H08110511 A JPH08110511 A JP H08110511A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- power source
- driver lsi
- crystal panel
- display
- 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 - Lifetime
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電気光学装置の駆動方
法に関し、更に詳しくは強誘電性液晶を用いたメモリー
性を有する電気光学装置の駆動方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving an electro-optical device, and more particularly to a method for driving an electro-optical device having a memory property using a ferroelectric liquid crystal.
【０００２】本発明は強誘電性液晶を用いたメモリー性
を有する電気光学装置において、電源スイッチがＯＦＦ
になった事を検出し全画面を消去状態にした後、電源が
落ちるようにすることにより、前記電気光学装置の未使
用時に表示を消去状態にしておくものである。The present invention relates to an electro-optical device having a memory property using a ferroelectric liquid crystal, in which a power switch is turned off.
Is detected, the entire screen is erased, and then the power is turned off so that the display is erased when the electro-optical device is not used.
【０００３】[0003]
【従来の技術】従来、電源を切った後でも表示状態を保
持する完全なメモリー性を有する電気光学装置は余り無
く、エレクトロ・クロミズムを利用した物が一部時計用
に供されただけで、そのメモリー性は不十分であり、電
源を切れば表示は徐々に消えてしまうという状態で、未
使用時の表示状態を規制しようという概念はなかった。2. Description of the Related Art Conventionally, there are not many electro-optical devices having a complete memory function of retaining a display state even after power is turned off, and only a part of a device utilizing electrochromism is provided for a clock. Its memory properties were insufficient, and the display gradually disappeared when the power was turned off. There was no concept of regulating the display state when not in use.
【０００４】[0004]
【発明が解決しようとする課題】最近、開発が急速に進
められている強誘電性液晶を用いた電気光学装置は優れ
た電気光学特性を有しており、従来、大容量のフラット
パネルディスプレイとして用いられてきたツイスティッ
ドネマチックタイプの液晶電気光学装置にくらべ、高コ
ントラスト、高速応答及びメモリー性という特徴を持っ
ている。Recently, an electro-optical device using a ferroelectric liquid crystal, which has been rapidly developed, has excellent electro-optical characteristics and has conventionally been used as a large-capacity flat panel display. Compared to the twisted nematic type liquid crystal electro-optical device that has been used, it has features of high contrast, high-speed response and memory properties.
【０００５】しかし、このメモリー性の為に電源を切っ
ても直前の表示状態を表示する、即ち、装置の使用終了
後単に電源な切るだけでは未使用時に不必要な表示状態
を保持するという問題点を持っていた。However, because of this memory property, even if the power is turned off, the immediately preceding display state is displayed, that is, if the power is simply turned off after use of the device, an unnecessary display state is maintained when not in use. Had a point.
【０００６】[0006]
【間題点を解決するための手段】本発明は電気光学装置
の駆動方法は、対向する基板内面にそれぞれ走査線と信
号線とを有し、該一対の基板内にメモリー性を有する液
晶を挟持してなる液晶パネルと、該走査線に接続してな
る走査線駆動回路と、該信号線に接続してなる信号線駆
動回路と、電源のＯＦＦ状態を検出する検出手段とを少
なくとも有する電気光学装置の駆動方法において、前記
検出手段がＯＦＦ状態を検出した場合、その情報に基づ
いて前記液晶パネルに書き込まれた表示内容を消去する
電圧を前記走査線と前記信号線との間に１フレ−ム以上
の期間印加することを特徴とする。The present invention relates to a driving method of an electro-optical device, wherein a liquid crystal having a memory property is provided in a pair of substrates, each having a scanning line and a signal line on the inner surfaces of the substrates facing each other. An electrical device having at least a liquid crystal panel sandwiched between the scanning lines, a scanning line driving circuit connected to the scanning lines, a signal line driving circuit connected to the signal lines, and a detection unit for detecting an OFF state of a power source. In the method of driving an optical device, when the detection means detects an OFF state, a voltage for erasing the display content written in the liquid crystal panel is applied to the scanning line and the signal line based on the information. -It is characterized in that the voltage is applied for a period of time equal to or longer than 10 m.
【０００７】[0007]
【作明】方法としては電源スイッチＯＦＦを検出し、消
去信号を出力した後、電気光学装置の対向する電極間を
同電位にする、あるいは駆動用ＬＳＩの出力を高抵抗に
するなどして消去の表示状態を保持したまま駆動回路内
の電源電圧をゼロにすることで未使用時の表示を消去状
態にするものである。[Creation] The method is to detect the power switch OFF and output an erasing signal, and then make the opposing electrodes of the electro-optical device have the same potential, or make the output of the driving LSI a high resistance to erase. The display state when not in use is erased by setting the power supply voltage in the drive circuit to zero while maintaining the display state.
【０００８】[0008]
〔実施例１〕図１は本発明で用いた駆動波形と電源電圧
の時間的関係を現す図面である。又、図２は図１の駆動
波形を実現する為の最も簡単な回路構成図である。すな
わち、液晶に電圧を印加するマトリクス状の透明電極が
対向する２枚のガラス基板上に構成され、この一対のガ
ラス基板間に強誘電性液晶を挟み込んだ液晶パネル１を
備えた電気光学装置の電源回路部２に電源スイッチ３の
ＯＮ一ＯＦＦを検出する回賂４な組み込んでおき、前記
電源回路部２の出力側に通常組み込まれる平滑用コソデ
ンソサー５の容量を大きくしておく。機器の電源を切る
時、電源スイッチがＯＦＦになったことを前記検出回路
４が検出し、直ちに走査用ドライバーＬＳＩ６及びデー
タ用ドライバーＬＳＩ７が消去信号を出すようにディス
プレイ・コントローラ８に対し、制御信号を出力する。
この時、マトリクス状の一方の走査電極が順次選択さ
れ、各行毎に消去信号が印加されるが、図１に示すよう
に消去パルスが印加された後、液晶に印加される電界が
ゼロになるようにする。前記平滑用コンデンサー５の大
きさは、この消去信号が１フレーム以上続き、全画面が
消去されるまでは走査用ドライバーＬＳＩ６及びデータ
用ドライバーＬＳＩ７の電源電圧が保持される程度にし
ておく。[Embodiment 1] FIG. 1 is a diagram showing a temporal relationship between a drive waveform and a power supply voltage used in the present invention. FIG. 2 is the simplest circuit configuration diagram for realizing the drive waveform of FIG. That is, an electro-optical device including a liquid crystal panel 1 in which matrix-shaped transparent electrodes for applying a voltage to liquid crystal are formed on two glass substrates facing each other, and a ferroelectric liquid crystal is sandwiched between the pair of glass substrates. The power supply circuit unit 2 is built in a circuit 4 for detecting ON / OFF of the power supply switch 3, and the capacity of the smoothing capacitor 5 normally installed on the output side of the power supply circuit unit 2 is increased. When the power of the device is turned off, the detection circuit 4 detects that the power switch has been turned off, and sends a control signal to the display controller 8 so that the scanning driver LSI 6 and the data driver LSI 7 immediately output an erase signal. Is output.
At this time, one of the scanning electrodes in a matrix is sequentially selected, and an erasing signal is applied to each row. After the erasing pulse is applied as shown in FIG. 1, the electric field applied to the liquid crystal becomes zero. To do. The size of the smoothing capacitor 5 is set such that the power supply voltage of the scanning driver LSI 6 and the data driver LSI 7 is held until the erase signal continues for one frame or more and the entire screen is erased.
【０００９】〔実施例２〕図３は別の回路構成図てあ
る。検出回賂１０は電源スイッチ１１が、ＯＦＦになっ
た事を検出し、ディスプレイ・コントローラ１２と電源
回路１３に同時に信号を送り出す。ディスプレイ・コン
トローラ１２は走査用ドライバーＬＳＩ１４及びデータ
用ドライバーＬＳＩ１５に消去信号を出力させる。又、
ドライバ一ＬＳＩ１４、１５は消去信号が出力された
後、出力段が高抵抗になるように制御され液晶パネルが
電気的に浮いた状態になるようにする。一方、電源回路
１５には液晶パネル９を駆動する１フレーム以上の時
間、２次側の電源電圧が保持されるようなディレイ回路
を組込んでおく。[Embodiment 2] FIG. 3 is another circuit configuration diagram. The detection circuit 10 detects that the power switch 11 is turned off, and sends a signal to the display controller 12 and the power circuit 13 at the same time. The display controller 12 causes the scanning driver LSI 14 and the data driver LSI 15 to output an erase signal. or,
After the erase signal is output, the driver-first LSIs 14 and 15 are controlled so that the output stage has a high resistance so that the liquid crystal panel is in an electrically floating state. On the other hand, the power supply circuit 15 has a built-in delay circuit for holding the power supply voltage on the secondary side for one frame or more for driving the liquid crystal panel 9.
【００１０】[0010]
【発明の効果】以上述べたように本発明によれば、パー
ソナルコンピューターや大型コンピューターの端末用の
ディスプレイとして用いられる、メモリー性を有する強
誘電性液晶を用いた電気光学装置において、その使用を
終える時表示を消去してから電源が落ちるため未使用時
に不用な表示をしている事がなくなり好ましい。As described above, according to the present invention, the use is completed in an electro-optical device using a ferroelectric liquid crystal having a memory property, which is used as a display for a terminal of a personal computer or a large computer. Since the power is turned off after the hour display is erased, unnecessary display is not required when not in use, which is preferable.
【図１】本発明で用いた駆動波形と電源電圧の時間的関
係図。FIG. 1 is a time relationship diagram of a drive waveform and a power supply voltage used in the present invention.
【図２】本発明の回路構成図。FIG. 2 is a circuit configuration diagram of the present invention.
【図３】他の回路構成図。FIG. 3 is another circuit configuration diagram.
１．液晶パネル ２．電源回路 ５．電源スイッチ ４．電源スイッチのＯＮ−ＯＦＦ検出回路 ５．平滑用コンデンサー ６．走査用ドライバーＬＳＩ ７．データ用ドライバーＬＳＩ ８．ディスプレイ・コントローラ ９．液晶パネル １０．電源スイッチのＯＮ−ＯＦＦ検出回路 １１．電源スイッチ １２．ディスプレイコントローラ １３．電源回賂 １４．走査用ドライバーＬＳＩ １５．データ用ドライバーＬＳＩ 1. Liquid crystal panel 2. Power supply circuit 5. Power switch 4. 4. ON / OFF detection circuit of power switch Smoothing capacitor 6. 6. Scan driver LSI 7. Data driver LSI Display controller 9. Liquid crystal panel 10. Power switch ON-OFF detection circuit 11. Power switch 12. Display controller 13. Power refusal 14. Scanning driver LSI 15. Data driver LSI
【手続補正書】[Procedure amendment]
【提出日】平成７年２月６日[Submission date] February 6, 1995
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【特許請求の範囲】[Claims]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００５[Name of item to be corrected] 0005
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００５】しかし、電源を切ってもこのメモリー性の
ために直前の表示状態を表示する。すなわち、装置の使
用終了後単に電源を切るだけでは、未使用時に不必要な
表示状態を保持するという問題点を持っていた。However, even if the power is turned off, the memory
To display the previous display state. In other words , there is a problem in that simply turning off the power after the use of the apparatus has maintained an unnecessary display state when not in use.
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００６[Correction target item name] 0006
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００６】[0006]
【問題点を解決するための手段】本発明の電気光学装置
の駆動方法は、対向する基板内面にそれぞれ走査線と信
号線とを有し、該一対の基板内にメモリー性を有する液
晶を挟持してなる液晶パネルと、該走査線に接続してな
る走査線駆動回路と、該信号線に接続してなる信号線駆
動回路と、電源のＯＦＦ状態を検出する検出手段とを少
なくとも有する電気光学装置の駆動方法において、前記
検出手段がＯＦＦ状態を検出した場合、その情報に基づ
いて前記液晶パネルに書き込まれた表示内容を消去状態
とするための消去パルスを１フレ−ム以上の期間印加す
るように前記走査線駆動回路及び前記信号線駆動回路を
制御した後、源電圧をゼロにすることを特徴とする。According to the method of driving an electro-optical device of the present invention, a scanning line and a signal line are respectively provided on the inner surfaces of opposed substrates, and a liquid crystal having a memory property is sandwiched between the pair of substrates. And a scanning line drive circuit connected to the scanning line, a signal line drive circuit connected to the signal line, and a detection unit for detecting the OFF state of the power supply. in the driving method of the device, when the detecting means detects the OFF state, clear the display contents written on the liquid crystal panel based on the information state
Erase pulse is applied for 1 frame or more.
So that the scanning line driving circuit and the signal line driving circuit are
After control, the source voltage is set to zero .
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００７[Correction target item name] 0007
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００７】[0007]
【作用】本発明は、電源スイッチＯＦＦを検出し、表示
内容を消去状態とするために消去パルスを１フレ−ム以
上の期間印加し、電源電圧をゼロにするものである。 According to the present invention, the power switch OFF is detected and displayed.
The erase pulse is set to 1 frame or less to put the contents into the erased state.
The voltage is applied during the above period to make the power supply voltage zero.
【手続補正５】[Procedure Amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００８[Correction target item name] 0008
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００８】[0008]
【実施例】 〔実施例１〕図１は本発明で用いた駆動波形と電源電圧
の時間的関係を現す図面である。又、図２は図１の駆動
波形を実現する為の最も簡単な回路構成図である。すな
わち、液晶に電圧を印加するマトリクス状の透明電極が
対向する２枚のガラス基板上に構成され、この一対のガ
ラス基板間に強誘電性液晶を挟み込んだ液晶パネル１を
備えた電気光学装置の電源回路部２に電源スイッチ３の
ＯＮ一ＯＦＦを検出する回路４な組み込んでおき、前記
電源回路部２の出力側に通常組み込まれる平滑用コンデ
ンサー５の容量を大きくしておく。機器の電源を切る
時、電源スイッチがＯＦＦになったことを前記検出回路
４が検出し、直ちに走査用ドライバーＬＳＩ６及びデー
タ用ドライバーＬＳＩ７が消去信号を出すようにディス
プレイ・コントローラ８に対し、制御信号を出力する。
この時、マトリクス状の一方の走査電極が順次選択さ
れ、各行毎に消去信号が印加されるが、図１に示すよう
に消去パルスが印加された後、液晶に印加される電界が
ゼロになるようにする。前記平滑用コンデンサー５の大
きさは、この消去信号が１フレーム以上続き、全画面が
消去されるまでは走査用ドライバーＬＳＩ６及びデータ
用ドライバーＬＳＩ７の電源電圧が保持される程度にし
ておく。[Embodiment 1] FIG. 1 is a diagram showing a time relationship between a drive waveform and a power supply voltage used in the present invention. FIG. 2 is the simplest circuit configuration diagram for realizing the drive waveform of FIG. That is, an electro-optical device including a liquid crystal panel 1 in which matrix-shaped transparent electrodes for applying a voltage to liquid crystal are formed on two glass substrates facing each other, and a ferroelectric liquid crystal is sandwiched between the pair of glass substrates. power supply circuit unit 2 in advance by incorporating circuit 4 detects the oN one OFF the power switch 3, a smoothing capacitor, which are normally included in the output side of the power supply circuit unit 2
Increase the capacity of sensor 5. When the power of the device is turned off, the detection circuit 4 detects that the power switch has been turned off, and sends a control signal to the display controller 8 so that the scanning driver LSI 6 and the data driver LSI 7 immediately output an erase signal. Is output.
At this time, one of the scanning electrodes in a matrix is sequentially selected, and an erasing signal is applied to each row. After the erasing pulse is applied as shown in FIG. 1, the electric field applied to the liquid crystal becomes zero. To do. The size of the smoothing capacitor 5 is set such that the power supply voltage of the scanning driver LSI 6 and the data driver LSI 7 is held until the erase signal continues for one frame or more and the entire screen is erased.
【手続補正６】[Procedure correction 6]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１０[Correction target item name] 0010
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１０】[0010]
【発明の効果】本発明は以上のような構成とすることに
よって、以下のような効果が得られる。電気光学装置の
電源をＯＦＦした後、表示内容を消去するように消去パ
ルスを１フレ−ム以上印加するので、電気光学装置の操
作開始時で先に書き込まれていた表示内容が消去されて
おり、しかもメモリー性を有する液晶素子に対して初期
のユニフォーム配向状態を実現できる。 The present invention is configured as described above.
Therefore, the following effects can be obtained . Electro-optical device
After turning off the power, the erase
Since more than one frame is applied, the operation of the electro-optical device is controlled.
The display contents that were written at the beginning of the operation are deleted.
In addition, the initial stage for liquid crystal devices with memory
The uniform orientation state of can be realized.
Claims (1)
線とを有し、該一対の基板内にメモリー性を有する液晶
を挟持してなる液晶パネルと、該走査線に接続してなる
走査線駆動回路と、該信号線に接続してなる信号線駆動
回路と、電源のＯＦＦ状態を検出する検出手段とを少な
くとも有する電気光学装置の駆動方法において、前記検
出手段がＯＦＦ状態を検出した場合、その情報に基づい
て前記液晶パネルに書き込まれた表示内容を消去する電
圧を前記走査線と前記信号線との間に１フレ−ム以上の
期間印加することを特徴とする電気光学装置の駆動方
法。1. A liquid crystal panel having a scanning line and a signal line respectively on opposing inner surfaces of a substrate, a liquid crystal having a liquid crystal having a memory property sandwiched between the pair of substrates, and a scanning connected to the scanning line. In a method of driving an electro-optical device having at least a line drive circuit, a signal line drive circuit connected to the signal line, and a detection means for detecting an OFF state of a power supply, the detection means detects the OFF state. Driving an electro-optical device, characterized in that a voltage for erasing the display content written in the liquid crystal panel is applied between the scanning line and the signal line for one frame or more based on the information. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP99595A JPH08110511A (en) | 1995-01-09 | 1995-01-09 | Electrooptical device driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP99595A JPH08110511A (en) | 1995-01-09 | 1995-01-09 | Electrooptical device driving method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61007521A Division JPH07109455B2 (en) | 1986-01-17 | 1986-01-17 | Driving method for electro-optical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08110511A true JPH08110511A (en) | 1996-04-30 |
Family
ID=11489186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP99595A Expired - Lifetime JPH08110511A (en) | 1995-01-09 | 1995-01-09 | Electrooptical device driving method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08110511A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030058167A (en) * | 2001-12-29 | 2003-07-07 | 엘지.필립스 엘시디 주식회사 | circuit for driving liquid crystal display device |
| US6690366B1 (en) | 1999-12-27 | 2004-02-10 | Fuji Xerox Co., Ltd. | Display apparatus |
| JP2005165232A (en) * | 2003-12-05 | 2005-06-23 | Seiko Epson Corp | Display device |
| KR100734275B1 (en) * | 2005-10-04 | 2007-07-02 | 삼성전자주식회사 | Detection Circuit for detecting whether source voltage is removed, method and display device for removing afterimage when source voltage is removed |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57108892A (en) * | 1980-12-25 | 1982-07-07 | Nippon Kogaku Kk | Drive circuit for electrooptical element having memory property |
| JPS60123825A (en) * | 1983-12-09 | 1985-07-02 | Seiko Instr & Electronics Ltd | Liquid crystal display element |
| JPS60172029A (en) * | 1984-02-17 | 1985-09-05 | Canon Inc | Driving method of optical modulation element |
| JPS62165630A (en) * | 1986-01-17 | 1987-07-22 | Seiko Epson Corp | Drinving method for electrooptic device |
| JPH07109455A (en) * | 1993-10-15 | 1995-04-25 | Asahi Chem Ind Co Ltd | Liquid crystalline compound and electroviscous fluid prepared using hte same |
-
1995
- 1995-01-09 JP JP99595A patent/JPH08110511A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57108892A (en) * | 1980-12-25 | 1982-07-07 | Nippon Kogaku Kk | Drive circuit for electrooptical element having memory property |
| JPS60123825A (en) * | 1983-12-09 | 1985-07-02 | Seiko Instr & Electronics Ltd | Liquid crystal display element |
| JPS60172029A (en) * | 1984-02-17 | 1985-09-05 | Canon Inc | Driving method of optical modulation element |
| JPS62165630A (en) * | 1986-01-17 | 1987-07-22 | Seiko Epson Corp | Drinving method for electrooptic device |
| JPH07109455A (en) * | 1993-10-15 | 1995-04-25 | Asahi Chem Ind Co Ltd | Liquid crystalline compound and electroviscous fluid prepared using hte same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6690366B1 (en) | 1999-12-27 | 2004-02-10 | Fuji Xerox Co., Ltd. | Display apparatus |
| KR20030058167A (en) * | 2001-12-29 | 2003-07-07 | 엘지.필립스 엘시디 주식회사 | circuit for driving liquid crystal display device |
| JP2005165232A (en) * | 2003-12-05 | 2005-06-23 | Seiko Epson Corp | Display device |
| JP4547902B2 (en) * | 2003-12-05 | 2010-09-22 | セイコーエプソン株式会社 | Display device |
| KR100734275B1 (en) * | 2005-10-04 | 2007-07-02 | 삼성전자주식회사 | Detection Circuit for detecting whether source voltage is removed, method and display device for removing afterimage when source voltage is removed |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |