JP2583211B2 - Liquid crystal display - Google Patents
Liquid crystal displayInfo
- Publication number
- JP2583211B2 JP2583211B2 JP60098953A JP9895385A JP2583211B2 JP 2583211 B2 JP2583211 B2 JP 2583211B2 JP 60098953 A JP60098953 A JP 60098953A JP 9895385 A JP9895385 A JP 9895385A JP 2583211 B2 JP2583211 B2 JP 2583211B2
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- JP
- Japan
- Prior art keywords
- voltage
- liquid crystal
- display
- electrode
- signal
- 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.)
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- 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、非線型抵抗素子であるMiM素子を用いた液
晶表示装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid crystal display device using a MiM element which is a non-linear resistance element.
マトリクス型液晶表示装置の方式として、非線型抵抗
素子であるMiM素子を用いた方式は、製造プロセスが他
の非線型素子に比較して簡単であり有望である。As a method of a matrix type liquid crystal display device, a method using a MiM element, which is a non-linear resistance element, has a simpler manufacturing process than other non-linear elements and is promising.
MiM素子の構成とMiM素子を用いた従来の液晶表示装置
の駆動方法を以下に述べる。第３図は、画素の構成を示
す。Taの走査電極５の表面を陽極酸化してTa2Ｏ5を形成
し、透明導電膜の表示電極16−１を形成する。両者の重
なり部15がMiM素子である。表示電極16−１と信号電極
６の間に液晶画素16を形成する。The configuration of the MiM element and a method for driving a conventional liquid crystal display device using the MiM element will be described below. FIG. 3 shows a configuration of a pixel. The surface of the Ta scan electrode 5 is anodized to form Ta 2 O 5, and the display electrode 16-1 made of a transparent conductive film is formed. The overlapping portion 15 of the two is a MiM element. A liquid crystal pixel 16 is formed between the display electrode 16-1 and the signal electrode 6.
第４図は従来の駆動波形である。信号電極駆動回路
（図示しない）から第３図の信号電極６に印加する波形
B6は、走査電極の選択電極が移動する毎に、Ｖ6-を中心
にＶ6-とＶ6+の間の表示内容に依存したアナログ電圧と
Ｖ8を中心にＶ8-とＶ8+の間の表示内容に依存したアナ
ログ電圧を交互に移動する。FIG. 4 shows a conventional drive waveform. Waveform applied to signal electrode 6 in FIG. 3 from signal electrode drive circuit (not shown)
B6 is scanned each time the selection electrode moves electrodes, V 6- centered V 6- and V 6+ V 8- and V 8+ around the analog voltage and V 8 that depends on the display content between the The analog voltage depending on the displayed contents is alternately moved.
走査電極駆動回路（図示しない）から第３図の走査電
極５に印加する波形B5は、期間Ｃ、Ｄとも非選択時は信
号電極の中心電圧がＶ6（Ｖ8）の場合はＶ7（Ｖ9）をと
る。期間Ｃの選択時はB5−１で示す信号電極電圧Ｖ6よ
り大きい電圧Ｖ9を印加して液晶画素16に正の電荷を蓄
積する。期間Ｄの選択時はB5−２で信号電極電圧Ｖ8よ
り小さい電圧Ｖ7を印加して液晶画素16に負の電荷を蓄
積して液晶画素の交流駆動を確保する。走査電極５の隣
りの走査電極９の波形B9は、期間Ｃ、Ｄとも非選択時は
信号電極の中心電圧がＶ6（Ｖ8）の場合はＶ7（Ｖ9）の
電圧である。期間Ｃの選択時はB5−１に続くB9−１に示
す時、信号電極電圧Ｖ8より小さい電圧Ｖ7を印加して、
液晶画素16に負の電荷を蓄積する。期間Ｄの選択時はB5
−２に続くB9−２に示す時、信号電極電圧Ｖ6より大き
い電圧Ｖ9を印加して、液晶画素16に正の電荷を蓄積す
る。The waveform B5 applied to the scan electrode 5 in FIG. 3 from the scan electrode drive circuit (not shown) is V 7 (V 7 (V 8 ) when the center voltage of the signal electrode is V 6 (V 8 ) when both the periods C and D are not selected. Take V 9 ). Upon selection of the period C accumulates positive charge on the liquid crystal pixels 16 by applying a signal electrode voltage V 6 is greater than the voltage V 9 indicated by B5-1. Upon selection of the period D is to ensure the AC driving of the liquid crystal pixel to accumulate a negative charge to the liquid crystal pixel 16 by applying a signal electrode voltage V 8 is smaller than the voltage V 7 in B5-2. Waveform B9 scanning electrodes 9 of the adjacent scanning electrodes 5, the period C, D with the non-selected time is when the center voltage of the signal electrode is V 6 (V 8) is a voltage V 7 (V 9). When the time selected period C is shown in B9-1 that follows B5-1, by applying a signal electrode voltage V 8 is smaller than the voltage V 7,
Negative charges are stored in the liquid crystal pixels 16. B5 when period D is selected
When shown in B9-2 followed -2 by applying a signal electrode voltage V 6 is greater than the voltage V 9, accumulates positive charge on the liquid crystal pixel 16.
前記従来の駆動方法において、信号電極の電圧と、走
査系の電圧が短かい周期、例えばテレビ画像表示では60
μsecの周期で大きく変動するので、該電圧変動時の変
動時期の微小の不均一性に起因する微小幅電圧パルスが
MiM素子15の容量成分を介して液晶画素に雑音電荷とし
蓄積され、表示画像の品質を著しく低下させていた。In the conventional driving method, the voltage of the signal electrode and the voltage of the scanning system have a short cycle, for example, 60
Since the voltage fluctuates greatly in the period of μsec, a minute width voltage pulse caused by a minute non-uniformity of the fluctuation time at the time of the voltage fluctuation is generated.
Noise charges were accumulated in the liquid crystal pixels via the capacitance component of the MiM element 15 and significantly reduced the quality of the displayed image.
さらに信号電極のアナログ値の印加電圧Ｖ6、Ｖ8と大
きく変動するので、回路が複雑になり信頼性が低下す
る。アナログアンプの電源電圧が増大し電源部の負担が
増大する等の欠点があった。Furthermore, since the applied voltages V 6 and V 8 of the analog values of the signal electrodes greatly fluctuate, the circuit becomes complicated and the reliability decreases. There are drawbacks such as an increase in the power supply voltage of the analog amplifier and an increase in the load on the power supply unit.
本発明の目的は、走査電極駆動回路の電源電圧を上げ
ることなく、前記問題点を除去した、回路構成が簡単で
信頼性が高く、表示画像の品質が高い、MiM素子を用い
た液晶表示装置の駆動装置を提供することである。An object of the present invention is to eliminate the above-mentioned problems without increasing the power supply voltage of the scan electrode drive circuit, to provide a simple circuit configuration, high reliability, high display image quality, and a liquid crystal display device using a MiM element. Is to provide a driving device.
上記目的を達成するために、本発明の液晶表示装置
は、次のような構成にすることを特徴とする。In order to achieve the above object, a liquid crystal display device of the present invention has the following configuration.
すなわち、走査電極と信号電極の各交点にMiM素子と
液晶画素を直列に配設し、信号電極に印加するオン表示
電圧およびオフ表示電圧を一定の周期（例えば、走査電
極の選択期間）で、直前の周期と異なる電圧に設定し、
走査電極には前記オン表示電圧およびオフ表示電圧に応
じた選択電圧を設定して、所定の周期毎（例えば、テレ
ビ表示の垂直同期期間）に書き込み極性が反転した電圧
を、液晶画素に印加して駆動する液晶表示装置におい
て、前記オン表示電圧およびオフ表示電圧には、第１の
信号電圧または第２の信号電圧を設定し、走査電極とと
もに走査電極駆動回路を２つ以上のブロックに分割し、
各ブロック毎に電源電圧を切り替えて、各ブロックの走
査電極の選択電圧を、前記オン表示電圧およびオフ表示
電圧に応じて独立に設定して駆動する液晶表示装置であ
る。That is, a MiM element and a liquid crystal pixel are arranged in series at each intersection of the scanning electrode and the signal electrode, and the ON display voltage and the OFF display voltage applied to the signal electrode are changed at a constant cycle (for example, a scanning electrode selection period). Set to a voltage different from the previous cycle,
A selection voltage corresponding to the ON display voltage and the OFF display voltage is set for the scan electrode, and a voltage whose write polarity is inverted is applied to the liquid crystal pixels at predetermined intervals (for example, a vertical synchronization period of television display). In the liquid crystal display device, the first signal voltage or the second signal voltage is set as the ON display voltage and the OFF display voltage, and the scan electrode driving circuit is divided into two or more blocks together with the scan electrodes. ,
This is a liquid crystal display device in which a power supply voltage is switched for each block, and a selection voltage of a scan electrode of each block is independently set according to the ON display voltage and the OFF display voltage to drive.
以下本発明の実施例を図面に基づいて詳述する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は本発明の液晶表示装置の構成図である。走査
電極５と信号電極６の交点にMiM素子15と液晶画素16を
直列に接続する。FIG. 1 is a configuration diagram of the liquid crystal display device of the present invention. The MiM element 15 and the liquid crystal pixel 16 are connected in series at the intersection of the scanning electrode 5 and the signal electrode 6.
走査電極は１つおきに走査電極駆動回路12、13に接続
する。信号電極駆動回路14にて、信号電極に表示内容に
依存した電圧を印加する。表示信号例えばビデオ信号17
に従って、制御回路18で走査電極駆動回路12、13、信号
電極駆動回路14を制御する。Every other scan electrode is connected to scan electrode drive circuits 12 and 13. In the signal electrode drive circuit 14, a voltage depending on the display content is applied to the signal electrode. Display signal such as video signal 17
Accordingly, the control circuit 18 controls the scan electrode drive circuits 12, 13 and the signal electrode drive circuit 14.
第２図に、MiM素子の電流（縦軸４）−電圧（横軸
３）特性および各部分の電圧波形を示す。１はTaに正を
印加した場合、２はTaに負を印加した場合のMiM素子の
電流である。FIG. 2 shows a current (vertical axis 4) -voltage (horizontal axis 3) characteristic of the MiM element and a voltage waveform of each part. 1 is the current of the MiM element when positive is applied to Ta and 2 is the current of the MiM element when negative is applied to Ta.
期間Ｃ、Ｄともに、信号電極６の印加電圧波形A6はＶ
2を中心として、表示内容に依存したＶ2-とＶ2+間の電
圧をとる。実線がオフ表示の場合の電圧、点線がオン表
示の場合の電圧であり、走査電極の選択電極が移動する
ごとにオフ表示、オン表示に対応する電圧は入れかわ
る。In both the periods C and D, the voltage waveform A6 applied to the signal electrode 6 is V
2 about the take the voltage between V 2-and V 2+ dependent on display. The solid line is the voltage for the off display, and the dotted line is the voltage for the on display. The voltage corresponding to the off display and the on display changes each time the selected electrode of the scan electrode moves.
走査電極駆動回路12の電源端子７（８）の電圧A7（A
8）は期間ＣでＶ4（Ｖ3）、期間ＤでＶ3（Ｖ1）をと
る。The voltage A7 (A) of the power supply terminal 7 (8) of the scan electrode drive circuit 12
8) takes V 4 (V 3 ) in period C and V 3 (V 1 ) in period D.
走査電極駆動回路13の電源端子10（11）の電圧A10（A
11）は期間ＣでＶ3（Ｖ1）、期間ＤでＶ4（Ｖ3）をと
る。走査電極５の電圧波形A5は期間Ｃの非選択時は、走
査電極駆動回路12の低電圧側の電源端子８の電圧Ｖ
3を、選択時は高電圧側の電源端子７の電圧Ｖ4であり、
期間Ｄでは非選択時に、走査電極駆動回路12の高電圧側
の電源端子８の電圧Ｖ3を、選択時は低電圧側の電源端
子８の電圧Ｖ1である。Voltage A10 (A) of power supply terminal 10 (11) of scan electrode drive circuit 13
11) takes V 3 (V 1 ) in period C and V 4 (V 3 ) in period D. When the voltage waveform A5 of the scan electrode 5 is not selected in the period C, the voltage V5 of the low-voltage side power supply terminal 8 of the scan electrode drive circuit 12 is used.
3 is the voltage V 4 of the power supply terminal 7 on the high voltage side when selected,
During the period unselected In D, the voltage V 3 of the high voltage side of the power supply terminal 8 of the scan electrode driving circuit 12, when selection is the voltage V 1 of the power supply terminal 8 of the low-voltage side.
走査電極９の電圧波形A9は期間Ｃ（Ｄ）の選択時はＶ
1（Ｖ4）、非選択時はともにＶ3である。The voltage waveform A9 of the scanning electrode 9 is V when the period C (D) is selected.
1 (V 4 ) and V 3 when not selected.
走査電極選択時の電圧は、選択電極が移動する毎にＶ
1とＶ4を交互に変化する。When the scanning electrode is selected, the voltage becomes V each time the selected electrode moves.
Varying one and V 4 alternately.
すなわち、本実施例の液晶表示装置では、信号電極に
印加された電圧の判にはＶ2-からＶ2+であり、第４図に
示す従来の場合と比較して狭い範囲になっている。この
ようにするためには、期間Ｃ、Ｄを通してA5のような走
査電圧が得られればよいのであるが、走査電極駆動回路
の電源回路がＶ4−Ｖ1であれば、固定の電源が可能であ
る。しかし、それでは、走査電極駆動回路に耐圧の高い
素子が必要となる。そこで、本実施例のように、走査電
極駆動回路を２つに分け、各々独立に走査電圧を設定す
るようにすれば、それぞれの回路の耐圧は、高々Ｖ4−
Ｖ3−Ｖ1のいずれか高い方程度ですむ。That is, in the liquid crystal display device of this embodiment, the voltage applied to the signal electrode is determined from V2 to V2 +, which is narrower than the conventional case shown in FIG. In order to achieve this, it is only necessary to obtain a scanning voltage such as A5 during the periods C and D. However, if the power supply circuit of the scan electrode driving circuit is V4-V1, a fixed power supply is possible. . However, in that case, a high withstand voltage element is required for the scan electrode drive circuit. Therefore, if the scanning electrode driving circuit is divided into two and the scanning voltage is set independently of each other as in this embodiment, the breakdown voltage of each circuit is at most V4−
V3-V1 whichever is higher is sufficient.
なお第１図で、走査電極駆動回路12（13）をさらにブ
ロックに分割し、おのおののブロック毎に新たな電源端
子を独立に設け、選択電極が該ブロックに存在しない期
間は、電源電圧Ｖ1とＶ4の値を小さくして、該ブロック
の消費電力を低下させることも可能である。Note that, in FIG. 1, the scanning electrode driving circuit 12 (13) further divided into blocks, provided independently a new power supply terminal for each respective block, a period in which the selected electrodes is not present in the block, the power supply voltages V 1 reduce the value of V 4 and, it is also possible to reduce the power consumption of the block.
また期間Ｃ、はテレビ表示の場合には垂直同期期間1
6.6msecであり、走査電極の選択位置は、水平同期期間6
4μsec毎に移動する。Period C is a vertical synchronization period 1 in the case of a television display.
6.6 msec, and the scanning electrode selection position is
Move every 4 μsec.
以上述べたように、本発明による液晶表示装置によれ
ば、信号電極および走査電極の電圧が短かい時間毎に変
動しないので、表示画像に雑音が混入せず高品質の画像
を得る。さらに信号電極の印加電圧範囲が狭いので、信
号電極印加波形の増幅器の電源電圧と、走査電極駆動回
路の耐圧が小さくてよいので、回路の信頼性が高い。As described above, according to the liquid crystal display device of the present invention, since the voltages of the signal electrodes and the scanning electrodes do not fluctuate every short time, a high-quality image is obtained without adding noise to the display image. Further, since the applied voltage range of the signal electrode is narrow, the power supply voltage of the amplifier having the waveform applied to the signal electrode and the withstand voltage of the scan electrode driving circuit may be small, so that the reliability of the circuit is high.
第１図は、本発明に基づく実施例の液晶表示装置の構成
図、 第２図は、本発明に基づく実施例の駆動波形図、 第３図は、画素の構成を示す説明図、 第４図は、従来の駆動波形図。 ５、９……走査電極、６……信号電極、12、13……走査
電極駆動回路、15……MiM素子、16……液晶画素、A5、A
9……走査電極電圧波形、A6……信号電極電圧波形、A
7、A8、A10、A11……電源端子電圧波形。FIG. 1 is a configuration diagram of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a driving waveform diagram of an embodiment according to the present invention, FIG. 3 is an explanatory diagram showing a configuration of a pixel, FIG. The figure shows a conventional drive waveform diagram. 5, 9 ... scanning electrode, 6 ... signal electrode, 12, 13 ... scanning electrode drive circuit, 15 ... MiM element, 16 ... liquid crystal pixel, A5, A
9: Scan electrode voltage waveform, A6: Signal electrode voltage waveform, A
7, A8, A10, A11 ... Power supply terminal voltage waveform.
Claims (2)
と液晶画素を直列に配設し、信号電極に印加するオン表
示電圧およびオフ表示電圧を一定の周期で、直前の周期
と異なる電圧に設定し、走査電極には前記オン表示電圧
およびオフ表示電圧に応じた選択電圧を設定して、所定
の周期毎に書き込み極性が反転した電圧を、液晶画素に
印加して駆動する液晶表示装置において、前記オン表示
電圧およびオフ表示電圧には、第１の信号電圧または第
２の信号電圧を設定し、走査電極とともに走査電極駆動
回路を２つ以上のブロックに分割し、各ブロック毎に電
源電圧を切り替えて、各ブロックの走査電極の選択電圧
を、前記オン表示電圧およびオフ表示電圧に応じて独立
に設定して駆動することを特徴とする液晶表示装置。An MiM element and a liquid crystal pixel are arranged in series at each intersection of a scanning electrode and a signal electrode, and an ON display voltage and an OFF display voltage applied to the signal electrode are constant and different from the immediately preceding period. Voltage, and a selection voltage corresponding to the on-display voltage and the off-display voltage is set for the scan electrode, and a voltage whose write polarity is inverted at a predetermined cycle is applied to the liquid crystal pixels to drive the liquid crystal display. In the device, a first signal voltage or a second signal voltage is set for the on-display voltage and the off-display voltage, and the scan electrode driving circuit is divided into two or more blocks together with the scan electrodes. A liquid crystal display device, wherein a power supply voltage is switched and a selection voltage of a scan electrode of each block is set and driven independently according to the ON display voltage and the OFF display voltage.
駆動するブロックと、偶数番の走査電極を駆動するブロ
ックで構成することを特徴とする特許請求の範囲第１項
記載の液晶表示装置。2. The liquid crystal display according to claim 1, wherein the scan electrode drive circuit comprises a block for driving odd-numbered scan electrodes and a block for driving even-numbered scan electrodes. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60098953A JP2583211B2 (en) | 1985-05-10 | 1985-05-10 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60098953A JP2583211B2 (en) | 1985-05-10 | 1985-05-10 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61256325A JPS61256325A (en) | 1986-11-13 |
| JP2583211B2 true JP2583211B2 (en) | 1997-02-19 |
Family
ID=14233453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60098953A Expired - Fee Related JP2583211B2 (en) | 1985-05-10 | 1985-05-10 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2583211B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0336570B1 (en) * | 1988-03-11 | 1994-01-12 | Matsushita Electric Industrial Co., Ltd. | Method of driving display device |
| JP2578941B2 (en) * | 1988-09-20 | 1997-02-05 | 日本電気株式会社 | Driving method of active matrix liquid crystal display device |
| JP2578942B2 (en) * | 1988-09-20 | 1997-02-05 | 日本電気株式会社 | Driving method of active matrix liquid crystal display device |
| JP2568659B2 (en) * | 1988-12-12 | 1997-01-08 | 松下電器産業株式会社 | Driving method of display device |
| JPH0782166B2 (en) * | 1988-12-29 | 1995-09-06 | セイコー電子工業株式会社 | Liquid crystal display |
| US5949397A (en) | 1994-08-16 | 1999-09-07 | Semiconductor Energy Laboratory Co., Ltd. | Peripheral driver circuit of Liquid crystal electro-optical device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5854391A (en) * | 1981-09-25 | 1983-03-31 | セイコーインスツルメンツ株式会社 | Picture display |
| JPS59225683A (en) * | 1983-06-07 | 1984-12-18 | Seiko Epson Corp | Driving method of display for television receiver |
| JPS6026992A (en) * | 1983-07-25 | 1985-02-09 | シチズン時計株式会社 | Driving of display panel |
-
1985
- 1985-05-10 JP JP60098953A patent/JP2583211B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61256325A (en) | 1986-11-13 |
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