JPS60142326A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPS60142326A
JPS60142326A JP24680083A JP24680083A JPS60142326A JP S60142326 A JPS60142326 A JP S60142326A JP 24680083 A JP24680083 A JP 24680083A JP 24680083 A JP24680083 A JP 24680083A JP S60142326 A JPS60142326 A JP S60142326A
Authority
JP
Japan
Prior art keywords
display
liquid crystal
scanning
electrodes
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.)
Pending
Application number
JP24680083A
Other languages
Japanese (ja)
Inventor
Shigeo Aoki
青木　滋夫
Osamu Yamamoto
修 山本
Masakimi Matsunami
松浪　将仁
Kazuhiko Sueoka
一彦 末岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP24680083A priority Critical patent/JPS60142326A/en
Publication of JPS60142326A publication Critical patent/JPS60142326A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE:To uniform an effective value voltage applied to all display dots in an off state and eliminate display irregularity by driving (n) scanning electrodes which constitute display dots by crossing the same signal electrodes with the number (n+2) of time divisions, and scanning the (n) scanning electrodes in an (n) time-division period except the 1st and the (n+2)th time division periods. CONSTITUTION:A scanning electrode driver 7 scans scanning electrodes 2a-2h of a liquid crystal panel 1 successively according to a timing signal sent from a controller 9. The controller 9, on the other hand, reads display data out of display memory 10 synchronously with the scanning and sends out them to a signal electrode driver 8. The signal electrode driver 8 sends a signal driving waveform to signal electrodes 3a-3h according to the display data. The 1st-the 8th scanning electrodes 2a-2h are scanned within one frame in the 2nd-the 9th time division periods except the 1st and final time division periods. Consequently, a uniform display is obtained over the entire surface of the panel and crosstalk vectors are equalized, thereby eliminating display irregularity.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明はコンピュータのディスプレイ端末などに用いる
液晶表示装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid crystal display device used in a computer display terminal or the like.

（従来例の構成とその問題点） 近年、液晶表示装置はその小型軽量、薄屋、低電圧駆動
、低消費電力という特徴から、小型のコンピュータを始
めとして、各種機器のディスプレイ装置として、その用
途を拡げている。なかでも時分割駆動されるＮＴ型のド
ツトマトリクス液晶表示装置はＯＡ機器用を中心として
木きな伸びを示している。(Conventional structure and its problems) In recent years, liquid crystal display devices have been used as display devices for various devices, including small computers, due to their small size, light weight, thin structure, low voltage drive, and low power consumption. is expanding. Among them, time-division driven NT type dot matrix liquid crystal display devices are showing rapid growth mainly for use in office automation equipment.

ＴＮ形やダストホスト形の液晶表示装置は液晶材料の寿
命の点から交流駆動が必要であるが、その交流駆動の方
式には１フレーム内で交流化する方式と２フレーム等の
偶数の複数フレーム内で交流化する方式の２つがあるが
、液晶への印加電圧の周波数成分の点から、高デユーテ
イの液晶表示装置では、後者が通常用いられている。TN type and dust host type liquid crystal display devices require AC drive in order to extend the lifespan of the liquid crystal material, but the AC drive methods include a method in which the AC is changed within one frame, and a method in which the AC is changed within one frame, and a method in which an even number of frames such as 2 frames are used. There are two methods of converting the voltage into alternating current, but the latter is usually used in high-duty liquid crystal display devices due to the frequency components of the voltage applied to the liquid crystal.

第１図は液晶表示装置のブロック図である。同図におい
て、１は液晶ノ？ネル、２８〜２ｈは走査電極、３８〜
３ｈは信号電極、４．５．６は表示ドツトであシ、以上
は液晶ノぐネルに含まれる。FIG. 1 is a block diagram of a liquid crystal display device. In the same figure, 1 is the liquid crystal? 28~2h are scanning electrodes, 38~
3h is a signal electrode, 4, 5, and 6 are display dots, and the above are included in the liquid crystal channel.

７は走査電極ドライバ、８は信号電極ドライバ、９はコ
ントローラ、１０は表示メモリである。走査電極ドライ
バ７は、コントローラ９から送られるタイミング信号に
応じ、順次液晶ノやネル１の走査電極２ａ〜２ｈを順次
走査する。一方コントローラ９はそれに同期して表示メ
モリ１０から表示データを読み出し、信号電極ドライバ
８に送出する。信号電極ドライバ８は表示データに応じ
て、信号電極３ａ〜３ｈＫ信号駆動波形を送り、その結
果、４，５．６などの表示ドツトの点灯、消灯が決まる
。7 is a scanning electrode driver, 8 is a signal electrode driver, 9 is a controller, and 10 is a display memory. The scan electrode driver 7 sequentially scans the scan electrodes 2a to 2h of the liquid crystal panel 1 in response to a timing signal sent from the controller 9. On the other hand, the controller 9 reads display data from the display memory 10 in synchronization with this and sends it to the signal electrode driver 8. The signal electrode driver 8 sends signal drive waveforms to the signal electrodes 3a to 3hK in accordance with display data, and as a result, lighting and extinguishing of display dots such as 4, 5, and 6 are determined.

第２図は、液晶表示装置の駆動波形例を示すもので、第
１図に一対応する。この例では液晶ノＲネル１の走査方
向のドツト数は８個であるので時分割数は８となり、い
わゆる１Ａデー−ティ駆動となる。FIG. 2 shows an example of driving waveforms for a liquid crystal display device, and corresponds to FIG. 1. In this example, since the number of dots in the scanning direction of the liquid crystal display panel 1 is eight, the number of time divisions is eight, resulting in so-called 1A data drive.

（４）は１番目の走査電極２ａに印加される駆動電圧波
形、 （Ｂ）は２番目の走査電極２ｂに印加される駆動電圧波
形、 （Ｃ）は最後の走査電極２ｈに印加される駆動電圧波形
、 ■）は１本の信号電極３ｄに印加される駆動電圧波形、 であシこの場合電極３ｄにつながるすべての表示ドツト
を消灯させる波形である。(4) is the drive voltage waveform applied to the first scan electrode 2a, (B) is the drive voltage waveform applied to the second scan electrode 2b, and (C) is the drive voltage waveform applied to the last scan electrode 2h. The voltage waveform (2) is a driving voltage waveform applied to one signal electrode 3d, and in this case is a waveform that turns off all display dots connected to the electrode 3d.

（匂は（Ａ）　−（Ｄ）間の電位差であシ、表示ドツト
４に印加される電圧波形、 Ｃ）は（Ｂ）　−Ｅ）間の電位差であシ、表示ドツト５
に印加される電圧波形、 （Ｇ）は（Ｃ）　−（Ｄ）間の電位差であシ、表示ドツ
ト６に印加される電圧波形、 である。図では液晶パネルの静電容量・透明電極の抵抗
等による波形なｔ、ｂも考慮して記しである。(The odor is the potential difference between (A) and (D), the voltage waveform applied to display dot 4, and C) is the potential difference between (B) and E), which is the voltage waveform applied to display dot 5.
(G) is the potential difference between (C) and (D), and the voltage waveform applied to the display dot 6 is as follows. In the figure, the waveforms t and b due to the capacitance of the liquid crystal panel, the resistance of the transparent electrode, etc. are also taken into consideration.

液晶は実効値に応答する、すなわち実効値が高いほど強
く点灯するが、（Ｅ）、ＣＦ）、←）の波形かられかる
ように（Ｆ）は（ト））、（Ｇ）に比較して実効値が高
くなっている。これはほとんど走査電極での波形に起因
するものである。すなわち、選択期間の電圧値■ｏ（お
よび”ｓ）とその前後の時間の電圧値Ｖ４（およびＶｌ
　）との電位差が大きいためである。一方、（Ｅ）　、
　（Ｇ）では選択期間とその前または後の時間との電位
差が小さいことがわかる。The liquid crystal responds to the effective value, that is, the higher the effective value, the stronger the lighting, but as you can see from the waveforms of (E), CF), and (←), (F) is more sensitive than (G) and (G). The effective value is high. This is mostly due to the waveform at the scanning electrode. In other words, the voltage value ■o (and "s") during the selection period and the voltage value V4 (and Vl
This is because there is a large potential difference between the On the other hand, (E),
In (G), it can be seen that the potential difference between the selection period and the time before or after the selection period is small.

この結果、同一の信号電極につながっている表示ドツト
、たとえば、第１図で信号電極３ｄにつながっている表
示ドラ）４，５．６においても、４．６の表示ドツトは
５の表示よりもクロストークレベルが高くなシ、より黒
くなる。したがって全ての表示ドツトが消灯している場
合には、１番目の走査電極２ａおよび最後の走査電極２
ｈにつながっている表示ドツトが横線状に他：ＸＶも黒
くなシ、表示にムラができるという問題点をもっていた
。As a result, even in display dots 4 and 5.6 connected to the same signal electrode (for example, display dots 4 and 5.6 connected to signal electrode 3d in FIG. The higher the crosstalk level, the darker the image. Therefore, when all the display dots are off, the first scan electrode 2a and the last scan electrode 2a
The display dots connected to the "h" were horizontally linear, and the "XV" also had the problem of not being black and causing uneven display.

１つのフレーム内で交流化する駆動方式ではこのような
欠点は生じないが、その周波数成分が高いという本質的
な問題のためコントラストが低下し、高デー−ティ駆動
の液晶表示装置には使えない欠点がちった。A drive method that converts AC within one frame does not have such drawbacks, but its inherent problem of high frequency components reduces contrast, making it unusable for high-date drive liquid crystal display devices. It had a lot of flaws.

（発明の目的） 本発明の目的は、従来の欠点を解消し、２つのフレーム
で交流化する駆動方式でアシながら、その表示にムラを
生じない液晶表示装置を提供することである。(Objective of the Invention) An object of the present invention is to eliminate the conventional drawbacks and to provide a liquid crystal display device that uses a drive system that uses alternating current in two frames and does not cause unevenness in its display.

（発明の構成） 本発明の液晶表示装置は、２フレームまたはそれ以上の
偶数の複数フレーム内で交流駆動されるマトリクス形の
液晶パネルを有し、前記液晶・母ネルの同一の信号電極
と交差して表示ドツトを構成するｎ本の信号電極をｎ　
＋　２個の時分割数で時分割駆動し、かつ第１番目と第
ｎ　＋２番目の時分割時間を除くｎ個の時分割期間で前
記ｎ個の走査電極を走査するように構成したものであ如
、これにより、消灯時の全表示ドツトにかかる実効値電
圧を均一とし、表示ムラをなくしたものである。(Structure of the Invention) The liquid crystal display device of the present invention has a matrix-type liquid crystal panel that is AC-driven within two frames or an even number of frames, and crosses the same signal electrodes of the liquid crystal/mother panel. n signal electrodes constituting a display dot.
+ 2 time divisions, and is configured to scan the n scanning electrodes in n time division periods excluding the 1st and n + 2nd time division times. As a result, the effective value voltage applied to all display dots when the light is off is made uniform, and display unevenness is eliminated.

（実施例の説明） 本発明の一実施例について、第１図ないし第３図に基づ
いて説明する。(Description of Embodiment) An embodiment of the present invention will be described based on FIGS. 1 to 3.

本発明による実施例のブロック図は、第１図の従来の液
晶表示装置のブロック図と同じであるが、変わるのはそ
のタイミングの与えがたである。したがって、回路的に
は従来にくらべ、ごく一部を除き、変更をあたえること
なく、実施することができる。The block diagram of the embodiment according to the present invention is the same as the block diagram of the conventional liquid crystal display device shown in FIG. 1, except for the timing. Therefore, compared to the conventional circuit, the present invention can be implemented without making any changes except for a very small part.

第３図は、本実施例のタイミング図である。本発明によ
る第１図の液晶表示装置を駆動する波形で、やはシ液晶
・ぐネル１の走査方向のドツト数は８個である。この場
合の実施例では時分割数は１０となＪ、いわゆる１／１
０ｆニーテイ駆動となる。FIG. 3 is a timing diagram of this embodiment. In the waveform for driving the liquid crystal display device of FIG. 1 according to the present invention, the number of dots in the scanning direction of the liquid crystal channel 1 is eight. In this example, the number of time divisions is 10, J, so-called 1/1.
It becomes 0f knee-tee drive.

（４）は１番目の走査電極２ａに印加される駆動電圧波
形、 （Ｂ）は２番目の走査電極２ｂに印加される駆動電圧波
形、 Ｃ）は最後の走査電極２ｈに印加される駆動電圧波形、 （ロ）は１本の信号電極３ｄに印加される駆動電圧波形
、 であシ、この場合電極３ｄにつながるすべての表示ドツ
トを消灯させる波形である。(4) is the driving voltage waveform applied to the first scanning electrode 2a, (B) is the driving voltage waveform applied to the second scanning electrode 2b, and C) is the driving voltage applied to the last scanning electrode 2h. The waveform (b) is the driving voltage waveform applied to one signal electrode 3d. In this case, it is a waveform that turns off all display dots connected to the electrode 3d.

（ト）は（４）−の）間の電位差であシ、表示ドツト４
に印加される電圧波形、 （ト）は（６）−の）間の電位差であり、表示ドツト５
に印加される電圧波形、 （Ｇ）は（Ｃ）−の）間の電位差であり、表示ドツト６
に印加される電圧波形、 である。第２図と同様に波形なまりを含めて記しである
。(g) is the potential difference between (4) and ), and display dot 4
The voltage waveform applied to, (g) is the potential difference between (6) -), and the display dot 5
The voltage waveform applied to (G) is the potential difference between (C) and ), and the display dot 6
The voltage waveform applied to is . Similar to FIG. 2, the waveform rounding is included.

（Ａ）　、　（Ｂ）　、　（ｃ）を見てわかるように、
３つの波形はその選択期間を与える・ぐルスの時間が異
なるだけで基本形は同じである。すなわち１フレーム内
にに、第１図における第１番目の走査電極２ａから第８
番目の走査電極２ｈを走査するようにしているわけであ
る。この結果、同一の信号電極につながってｂる表示ド
ツト、たとえば第１図において信号電極３ｄにつながっ
ている表示ドツト４，５および６においてもその表示ド
ツトに印加される実効値電圧は同じとなる。したがって
パネル全面にわたって均一な表示がなされ、そのクロス
）　−フレペルは同一のものとを夕、表示ムラはなくな
る。As you can see from (A), (B), and (c),
The three waveforms have the same basic shape, only the time of the wave that gives the selection period differs. That is, within one frame, the first to eighth scanning electrodes 2a in FIG.
This means that the scanning electrode 2h is scanned. As a result, the effective voltage applied to the display dots 4, 5, and 6 connected to the same signal electrode, for example, the display dots 4, 5, and 6 connected to the signal electrode 3d in FIG. 1, is the same. . Therefore, uniform display is achieved over the entire panel surface, and display unevenness disappears when the same frame is used.

本実施例では液晶パネル１の縦ドツト数は８個と少ない
ものであったが、最近においては、縦ドツト数が６４個
、あるいは１００個ないし１２８個と多くなっている。In this embodiment, the number of vertical dots on the liquid crystal panel 1 was as small as 8, but recently, the number of vertical dots has increased to 64, or 100 to 128.

しかしこの場合でも同様に対応できる。すなわち縦ドツ
ト数が１２８個のときは時分割数を１２８＋２＝１３０
とし、その第１番目と第１３０番目の時分割期間を除く
１２８の時分割期間で１２８本の走査電極を走査すれば
よい。However, even in this case, it can be handled in the same way. In other words, when the number of vertical dots is 128, the number of time divisions is 128+2=130.
Then, 128 scanning electrodes may be scanned in 128 time division periods excluding the first and 130th time division periods.

また以上説明した実施例は単純マ）　ＩＪクロス液晶表
示装置についてであるが、液晶パネルを上下から分割駆
動する２連マトリクスや２重等多重マトリクスの液晶表
示装置についても同様に駆動することができる。Furthermore, although the embodiment described above is a simple IJ cross liquid crystal display device, it is also possible to similarly drive a double matrix liquid crystal display device or a double equal multiplex matrix liquid crystal display device in which the liquid crystal panel is driven by dividing it from above and below. .

（発明の効果） 本発明によれば、同一の信号電極と交差して表示ドツト
を構成する１本の走査電極に対してｎ＋２の時分割数を
もって駆動し、その第１番目と第ｎ千２番目の時分割期
間を除くｎの時分割期間で１本の走査電極を走査するこ
とによシ、全ての表示ドツトの消灯時に印加される実効
値電圧値を等しくし、そのクロストークレベルをカーと
する効果がある。(Effects of the Invention) According to the present invention, one scanning electrode that intersects with the same signal electrode to form a display dot is driven with n+2 time division numbers, and the first and By scanning one scanning electrode in n time division periods excluding the th time division period, the effective voltage values applied when all display dots are turned off are made equal, and the crosstalk level is reduced. This has the effect of

さらにｎ　＋２の時分割数をｎ　＋　２ｍ　（０（ｍ（
１）とすることにより、１時分割期間の長さを従来の駆
動方法よりほとんど変えることなく、同様に駆動するこ
とにより同等の効果を得ることができる。Furthermore, the number of time divisions of n + 2 is changed to n + 2m (0(m(
1), the same effect can be obtained by driving in the same way without changing the length of one time division period compared to the conventional driving method.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は液晶表示装置のブロック図、第２図は従来の駆
動方式のタイミングチャート、第３図は本発明の一実施
例における液晶表示装置の駆動方式のタイミングチャー
トでちる。 ｌ・・・液晶パネル、２ａ〜２ｈ・・・走査電極、３ａ
〜３ｈ・・信号電極、４．５．６・・・表示ドツト、７
・・・走査電極ドライバ、８・・・信号電極ドライバ、
９・・・コントローラ、１０・・・表示メモリ、１１・
・・走査方向。FIG. 1 is a block diagram of a liquid crystal display device, FIG. 2 is a timing chart of a conventional driving method, and FIG. 3 is a timing chart of a driving method of a liquid crystal display device according to an embodiment of the present invention. l...Liquid crystal panel, 2a to 2h...Scanning electrode, 3a
~3h...Signal electrode, 4.5.6...Display dot, 7
...Scanning electrode driver, 8...Signal electrode driver,
9... Controller, 10... Display memory, 11.
...Scanning direction.

Claims (2)

【特許請求の範囲】[Claims] （１）２つのフレームまたはそれ以上の偶数の複数フレ
ーム内で交流駆動されるマトリクス形の液晶ノｊネルを
有し、該液晶・ぐネルの同一の信号電極と交差して表示
ドツトを構成するｎ本の走査電極をｎ＋２個の時分割数
で時分割駆動し、かつ第１番目と第ｎ　千２番目の時１
分割期間を除くｎ個の時分割期間で前記ｎ本の走査電極
を走査すると、とを特徴とする液晶表示装置。(1) It has a matrix-type liquid crystal channel that is AC-driven in two frames or an even number of frames, and the display dots are formed by intersecting the same signal electrodes of the liquid crystal channel. The n scanning electrodes are time-divisionally driven with n+2 time divisions, and the 1st and nth 1,000th times 1
A liquid crystal display device characterized in that when the n scanning electrodes are scanned in n time division periods excluding the division period. （２）第１番目と第ｎ　＋２番目の時分割期間の時間を
残るｎ個の時分割期間よシも短かくしたことを特徴とす
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 device according to claim (1), characterized in that the times of the first and nth + second time division periods are also shorter than the remaining n time division periods. .
JP24680083A 1983-12-29 1983-12-29 Liquid crystal display device Pending JPS60142326A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24680083A JPS60142326A (en) 1983-12-29 1983-12-29 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24680083A JPS60142326A (en) 1983-12-29 1983-12-29 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPS60142326A true JPS60142326A (en) 1985-07-27

Family

ID=17153863

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24680083A Pending JPS60142326A (en) 1983-12-29 1983-12-29 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPS60142326A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6156396A (en) * 1984-07-24 1986-03-22 富士通株式会社 Liquid crystal display unit
JPS62121493A (en) * 1985-11-19 1987-06-02 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Display unit
US5058994A (en) * 1987-11-12 1991-10-22 Canon Kabushiki Kaisha Liquid crystal apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6156396A (en) * 1984-07-24 1986-03-22 富士通株式会社 Liquid crystal display unit
JPH0138318B2 (en) * 1984-07-24 1989-08-14 Fujitsu Ltd
JPS62121493A (en) * 1985-11-19 1987-06-02 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Display unit
US5058994A (en) * 1987-11-12 1991-10-22 Canon Kabushiki Kaisha Liquid crystal apparatus

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