JP2928274B2 - Liquid crystal display - Google Patents
Liquid crystal displayInfo
- Publication number
- JP2928274B2 JP2928274B2 JP1175830A JP17583089A JP2928274B2 JP 2928274 B2 JP2928274 B2 JP 2928274B2 JP 1175830 A JP1175830 A JP 1175830A JP 17583089 A JP17583089 A JP 17583089A JP 2928274 B2 JP2928274 B2 JP 2928274B2
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- liquid crystal
- driving
- crystal display
- voltage
- electrode
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は映像や情報機器などに用いることができる液
晶表示装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device that can be used for video and information equipment.
従来の技術 従来、液晶表示装置は第9a図に示すような構成であっ
た。３は液晶表示素子で、走査電極１と信号電極２がマ
トリックス構成されている。走査電極１は走査電極駆動
回路Ａで駆動され、信号電極２は信号電極駆動回路Ｃで
駆動される。走査電極駆動回路A,信号電極駆動回路Ｃは
各々駆動用半導体素子（以下、駆動用LSIという）4,8か
らなる。2. Description of the Related Art Conventionally, a liquid crystal display device has a configuration as shown in FIG. 9a. Reference numeral 3 denotes a liquid crystal display element, in which scanning electrodes 1 and signal electrodes 2 are arranged in a matrix. The scanning electrode 1 is driven by a scanning electrode driving circuit A, and the signal electrode 2 is driven by a signal electrode driving circuit C. The scanning electrode driving circuit A and the signal electrode driving circuit C are composed of driving semiconductor elements (hereinafter referred to as driving LSIs) 4 and 8, respectively.
電圧設定回路の設定した電圧は各々走査電極制御回
路，走査電極制御回路により制御され各駆動用LSI4,8に
印加され、駆動する。前図の要部における電圧波形を示
したのが第９図ｂである。また、第10図は第９図ａに示
した液晶駆動電圧を設定する電圧設定回路の一例を示す
回路図である。The voltage set by the voltage setting circuit is controlled by the scan electrode control circuit and the scan electrode control circuit, respectively, and is applied to each of the driving LSIs 4 and 8 to drive. FIG. 9B shows the voltage waveform in the main part of the previous figure. FIG. 10 is a circuit diagram showing an example of a voltage setting circuit for setting the liquid crystal drive voltage shown in FIG. 9A.
この種の液晶表示装置においては、第11図a,b,c,dに
示すように、液晶表示素子と駆動回路との接続の仕方は
いろいろな構成となっている。第11図（ａ）は液晶表示
素子３の走査電極１と信号電極２の各々片側に駆動回路
A,Cを接続した構成、第11図（ｂ）は液相表示素子３の
走査電極１の両側と信号電極２の片側に駆動回路A,B,C
を接続した構成、第11図（ｃ）は液晶表示素子３の走査
電極１の片側と信号電極２の両側に駆動回路A,C,Dを接
続した構成、第11図（ｄ）は液晶表示素子３の各々両側
に駆動回路A,B,C,Dを接続した構成をそれぞれ示す。ま
た、このように接続した駆動回路A,B,C,Dの各走査電極
２側，信号電極３側駆動用半導体素子（以下、駆動用LS
Iという）4,8に入力される液晶駆動電圧は例えば第９図
ｂのような形で印加され、各駆動用LSI4,8に印加される
電圧はすべて同じ波形の信号であった。In this type of liquid crystal display device, as shown in FIGS. 11A, 11B, 11C, and 11D, there are various ways of connecting a liquid crystal display element to a drive circuit. FIG. 11 (a) shows a driving circuit on one side of each of the scanning electrode 1 and the signal electrode 2 of the liquid crystal display element 3.
FIG. 11 (b) shows drive circuits A, B, C connected to both sides of the scanning electrode 1 and one side of the signal electrode 2 of the liquid phase display element 3. FIG.
FIG. 11 (c) shows a configuration in which drive circuits A, C and D are connected to one side of the scanning electrode 1 and both sides of the signal electrode 2 of the liquid crystal display element 3, and FIG. 11 (d) shows a liquid crystal display. A configuration in which drive circuits A, B, C, and D are connected to both sides of the element 3, respectively, is shown. The driving semiconductor elements (hereinafter referred to as driving LSIs) of the driving circuits A, B, C, and D connected in this manner are connected to the scanning electrodes 2 and the signal electrodes 3.
The liquid crystal driving voltages input to the driving LSIs 4 and 8 were applied in the form shown in FIG. 9B, for example, and the voltages applied to the driving LSIs 4 and 8 were all signals having the same waveform.
発明が解決しようとする課題 このような従来の構成では強誘電性液晶を用いた液晶
表示素子３の配向膜に膜厚差がある場合（たとえば、斜
方蒸着により形成した配向膜の場合）液晶表示素子とし
て均一な表示が得られないという課題があった。Problems to be Solved by the Invention In such a conventional configuration, when the alignment film of the liquid crystal display element 3 using ferroelectric liquid crystal has a difference in thickness (for example, in the case of an alignment film formed by oblique evaporation), There has been a problem that uniform display cannot be obtained as a display element.
その一例について以下に述べる。強誘電性液晶表示素
子の安定した配向法の一つとして、特開昭62−192724号
に記載されているように、基板の法線に対する角度が70
度から88度の範囲の蒸着角度で絶縁物を斜方蒸着して配
向膜を形成した一対の基板を、蒸着方向が同一方向とな
るように対向させる方法がある。第12図はこの斜方蒸着
を示した図であり、第13図は斜方蒸着により配向膜16を
形成した電極基板15を蒸着方向が同一となるように対向
１液晶層13を挟持した液晶表示素子の断面図である。し
かし、このようにして形成された配向膜16は膜圧が均一
にならず、蒸着源17に近く位置した部分では厚く、蒸着
源17から遠ざかるにつれて連続的に薄くなる。たとえ
ば、蒸着源17にSiOを用い、A4サイズの基板15の中心と
蒸着源17の距離を約55cm,基板15の中心で蒸着角度80度
として形成した配向膜16の膜厚は、蒸着源17より約65cm
の位置で約300Å，約45cmの位置で約900Åであった。そ
して、このような配向膜16に膜厚差を有する電極基板15
を用いて、第12図のような構成の液晶表示素子３を作製
した場合、液晶13は良好な配向をする。An example is described below. As one of the stable alignment methods for a ferroelectric liquid crystal display device, as described in JP-A-62-192724, an angle with respect to a normal line of a substrate is 70 degrees.
There is a method in which a pair of substrates on each of which an orientation film is formed by obliquely depositing an insulator at a deposition angle in a range of degrees to 88 degrees so that the deposition directions are the same. FIG. 12 is a view showing this oblique deposition, and FIG. 13 is a liquid crystal in which an electrode substrate 15 on which an alignment film 16 is formed by oblique deposition has an opposed one liquid crystal layer 13 sandwiched so that the deposition direction is the same. It is sectional drawing of a display element. However, the alignment film 16 formed in this manner does not have a uniform film pressure, and is thick in a portion located near the evaporation source 17 and becomes thinner continuously as the distance from the evaporation source 17 increases. For example, using SiO as the vapor deposition source 17, the thickness of the alignment film 16 formed at a distance of about 55 cm between the center of the A4 size substrate 15 and the vapor deposition source 17 and a deposition angle of 80 degrees at the center of the substrate 15 is the same as About 65cm
It was about 300 cm at the position of Å and about 900 cm at the position of about 45 cm. Then, an electrode substrate 15 having a film thickness difference in such an alignment film 16 is formed.
When the liquid crystal display element 3 having the configuration as shown in FIG. 12 is manufactured by using the liquid crystal, the liquid crystal 13 is well aligned.
しかし、この液晶表示素子３の走査電極１と信号電極
２との間に前述のように一定電圧を印加しても、液晶層
13に印加される電圧は配向膜16の膜厚の厚い部分で低く
薄い部分で高くなるために、均一な表示とならない。ま
た、現在期待されている大面積あるいは高密度画素の液
晶表示素子では、液晶表示素子３と駆動回路A,B,C,Dと
の接続部から各画素までの電極抵抗が大きくなる部分も
あり、この電極抵抗による電圧降下のために各画素の液
晶層に印加される電圧が不均一となる。従って、従来の
構成では、液晶表示素子として均一な表示が得られない
という課題があった。However, even if a constant voltage is applied between the scanning electrode 1 and the signal electrode 2 of the liquid crystal display element 3 as described above, the liquid crystal layer
Since the voltage applied to 13 is low in the thick portion of the alignment film 16 and high in the thin portion, uniform display is not obtained. Further, in a liquid crystal display device of a large area or a high density pixel which is currently expected, there is a portion where the electrode resistance from the connection portion between the liquid crystal display device 3 and the driving circuits A, B, C, D to each pixel becomes large. Due to the voltage drop due to the electrode resistance, the voltage applied to the liquid crystal layer of each pixel becomes non-uniform. Therefore, the conventional configuration has a problem that uniform display cannot be obtained as a liquid crystal display element.
本発明は以上のような課題を解決するもので、液晶表
示素子の表示を均一にすることを目的とするものであ
る。The present invention has been made to solve the above problems, and has as its object to make the display of a liquid crystal display element uniform.
課題を解決するための手段 上記目的を達成するために本発明は、走査電極と信号
電極とを有する液晶表示素子の走査電極と信号電極各々
複数の駆動用半導体素子を接続し、前記走査電極側駆動
用半導体素子の少なくとも１個に他の駆動用半導体素子
と異なる液晶駆動電圧を入力するものである。Means for Solving the Problems In order to achieve the above object, the present invention relates to a method of connecting a plurality of driving semiconductor elements to each of a scanning electrode and a signal electrode of a liquid crystal display element having a scanning electrode and a signal electrode, A liquid crystal driving voltage different from that of the other driving semiconductor elements is input to at least one of the driving semiconductor elements.
作用 このような構成によれば、不均一表示部分の駆動用LS
Iの液晶駆動電圧を変えることにより、各画素の液晶層
に均一な電圧を印加することができるので、液晶表示素
子は均一な表示を提供することができる。Action According to such a configuration, the driving LS for the non-uniform display portion
By changing the liquid crystal drive voltage of I, a uniform voltage can be applied to the liquid crystal layer of each pixel, so that the liquid crystal display element can provide a uniform display.
実施例 以下、本発明の一実施例について、図面を参照しなが
ら説明する。Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
（実施例１） 第１図に本発明の第１の実施例を示す。蒸着方向12が
走査電極１と平行になるように第12図に示す方法で電極
基板15上に斜方蒸着により配向膜16を形成する。この基
板を用いて第13図のような強誘電性液晶表示素子３を得
る。さらに、この液晶表示素子の走査電極１に対して、
配向膜16の膜厚が厚い電極側に駆動回路Ａを、薄い電極
側に駆動回路Ｂを、信号電極２に対して駆動回路Ｃを接
続する。駆動回路Ｃは複数の駆動用LSI8を有し、液晶駆
動電圧V0,V2,V3,V5が各駆動用LSI8で同一である。駆動
回路Ａは複数の駆動用LSI4を有し、液晶駆動電圧V0,V1,
V4,V5が各駆動用LSI4で同一である。また、駆動回路Ｂ
は複数の駆動用LSI6を有し、液晶駆動電圧V0X,V1X,V4X,
V5Xが各駆動用LSI6で同一であるが、駆動回路Ａの液晶
駆動電圧とは異なる。Embodiment 1 FIG. 1 shows a first embodiment of the present invention. An orientation film 16 is formed on the electrode substrate 15 by oblique deposition so that the deposition direction 12 is parallel to the scanning electrode 1 by the method shown in FIG. Using this substrate, a ferroelectric liquid crystal display element 3 as shown in FIG. 13 is obtained. Further, with respect to the scanning electrode 1 of this liquid crystal display element,
The drive circuit A is connected to the electrode side where the alignment film 16 is thick, the drive circuit B is connected to the thin electrode side, and the drive circuit C is connected to the signal electrode 2. The driving circuit C has a plurality of driving LSIs 8, and the liquid crystal driving voltages V 0 , V 2 , V 3 , and V 5 are the same for each driving LSI 8. The driving circuit A has a plurality of driving LSIs 4, and the liquid crystal driving voltages V 0 , V 1 ,
V 4 and V 5 are the same for each driving LSI 4. Further, the driving circuit B
Has a plurality of driving LSIs 6, and has a liquid crystal driving voltage V 0X , V 1X , V 4X ,
Although V 5X is identical in each of the drive LSI 6, differs from the liquid crystal drive voltage of the drive circuit A.
第２図は、バイアス比が1/4の場合の各液晶駆動電圧
の設定例を示す図である。第２図（ａ）は駆動回路Ａと
駆動回路Ｃに対する液晶駆動電圧設定回路であり、第２
図（ｂ）は駆動回路Ｂに対する液晶駆動電圧設定回路で
ある。各液晶駆動電圧は第２図（ｃ）に示すようにV0＞
V0X＞V1＞V1X＞V2＝V3＞V4X＞V4＞V5X＞V5となるような
設定であり、V0X,V1X,V4X,V5Xは可変抵抗５により変え
ることができる。FIG. 2 is a diagram showing a setting example of each liquid crystal drive voltage when the bias ratio is 1/4. FIG. 2A shows a liquid crystal drive voltage setting circuit for the drive circuits A and C.
FIG. 2B shows a liquid crystal drive voltage setting circuit for the drive circuit B. Each liquid crystal drive voltage is V 0 > as shown in FIG.
V 0X > V 1 > V 1X > V 2 = V 3 > V 4X > V 4 > V 5X > V 5 The setting is such that V 0X , V 1X , V 4X , V 5X is controlled by the variable resistor 5. Can be changed.
第２図に示した液晶駆動電圧を用いて、前記液晶表示
素子３を２パルス複数同時消去方で駆動したとき、電極
間に印加される駆動波形は第３図のようになる。すなわ
ち、走査電極１に選択信号が印加されたとき、駆動波形
は駆動回路Ｂ側はＡ側に比べて電圧が低く、可変抵抗５
を用いて配向膜16の膜厚差による電圧差を相殺するよう
に電圧を設定することができる。従って液晶表示素子３
全体で液晶層13に印加される電圧を均一化することがで
きる。また、走査電極１に非選択信号が印加されたと
き、駆動波形は各画素によって異なるが、液晶層に印加
される電圧が液晶表示素子３全体で均一とならなくと
も、その電圧が表示特性に影響しない低い電圧に設定す
ることにより、良好な表示状態を維持することができ
る。When the liquid crystal display element 3 is driven by the two-pulse simultaneous erasing method using the liquid crystal driving voltage shown in FIG. 2, the driving waveform applied between the electrodes is as shown in FIG. That is, when the selection signal is applied to the scan electrode 1, the drive waveform of the drive circuit B side is lower than that of the
The voltage can be set so as to cancel the voltage difference due to the film thickness difference of the alignment film 16 by using. Therefore, the liquid crystal display element 3
The voltage applied to the liquid crystal layer 13 can be made uniform as a whole. Further, when a non-selection signal is applied to the scanning electrode 1, the driving waveform differs for each pixel, but even if the voltage applied to the liquid crystal layer is not uniform throughout the liquid crystal display element 3, the voltage may affect the display characteristics. By setting the voltage to a low voltage that does not affect the operation, a favorable display state can be maintained.
このように、走査電極１に対して平行な方向に配向膜
16の膜厚差を有する液晶表示素子３は、液晶層13に印加
される電圧が均一になるように走査電極１に接続した少
なくとも片側の駆動用LSI6に入力する液晶駆動電圧を調
整することにより、均一な表示が得られる。As described above, the alignment film is oriented in a direction parallel to the scanning electrode 1.
The liquid crystal display element 3 having a thickness difference of 16 can adjust the liquid crystal driving voltage input to at least one driving LSI 6 connected to the scanning electrode 1 so that the voltage applied to the liquid crystal layer 13 becomes uniform. And a uniform display can be obtained.
（実施例２） 第４図に本発明の第２の実施例を示す。本実施例では
蒸着方向12が信号電極２と平行になるように斜方蒸着に
より配向膜16を形成した電極基板15を用い、実施例１と
同様に第12図のような強誘電性液晶表示素子３を得る。
さらに、この液晶表示素子３の信号電極２に対して、配
向膜の膜厚が厚い電極側に駆動回路Ｃを、薄い電極側に
駆動回路Ｄを、走査電極１に対して駆動回路Ａを接続す
る。駆動回路Ａは複数の駆動用LSI4を有し、液晶駆動電
圧V0,V1,V4,V5が各駆動用LSI4で同一である。駆動回路
Ｃは，複数の駆動用LSI8を有し、液晶駆動電圧V0,V2,
V3,V5が各駆動用LSI8で同一である。また、駆動回路Ｄ
は、複数の駆動用LSI10を有し、液晶駆動電圧V0Y,V2Y,V
3Y,V5Yが各駆動用LSI10で同一であるが、駆動回路Ｃの
液晶駆動電圧とは異なる。Embodiment 2 FIG. 4 shows a second embodiment of the present invention. In this embodiment, an electrode substrate 15 on which an alignment film 16 is formed by oblique evaporation so that a deposition direction 12 is parallel to the signal electrode 2 is used, and a ferroelectric liquid crystal display as shown in FIG. Element 3 is obtained.
Further, a drive circuit C is connected to the signal electrode 2 of the liquid crystal display element 3 on the side of the electrode having a thick alignment film, a drive circuit D is connected to the side of the thin electrode, and a drive circuit A is connected to the scan electrode 1. I do. The driving circuit A has a plurality of driving LSIs 4, and the liquid crystal driving voltages V 0 , V 1 , V 4 , and V 5 are the same for each driving LSI 4. The driving circuit C has a plurality of driving LSIs 8 and has a liquid crystal driving voltage V 0 , V 2 ,
V 3 and V 5 are the same in each drive LSI 8. Further, the driving circuit D
Has a plurality of driving LSIs 10 , and has a liquid crystal driving voltage V 0Y , V 2Y , V
Although 3Y and V5Y are the same in each drive LSI 10, they are different from the liquid crystal drive voltage of the drive circuit C.
第５図は、バイアス比が1/4の場合の各液晶駆動電圧
の設定例を示す。第５図（ａ）は駆動回路Ａと駆動回路
Ｃに対する液晶駆動電圧設定回路であり、第５図（ｂ）
は駆動回路Ｄに対する液晶駆動電圧設定回路である。各
液晶駆動電圧は第５図（ｃ）に示すように、V0＞V0Y＞V
1＞V3Y＞V3＝V2＞V2Y＞V4＞V5Y＞V5となるような設定で
あり、V0Y,V3Y,V2Y,V5Yは可変抵抗７により変えること
ができる。FIG. 5 shows a setting example of each liquid crystal drive voltage when the bias ratio is 1/4. FIG. 5A shows a liquid crystal driving voltage setting circuit for the driving circuits A and C, and FIG.
Is a liquid crystal drive voltage setting circuit for the drive circuit D. Each liquid crystal drive voltage is V 0 > V 0Y > V, as shown in FIG.
1> V 3Y> is V 3 = V 2> V 2Y > V 4> V 5Y> V 5 to become such a setting, V 0Y, V 3Y, V 2Y, V 5Y can be varied by the variable resistor 7 .
第５図に示した液晶駆動電圧を用いて、前記液晶表示
素子３を２パルス複数同時消去方で駆動したとき、電極
間に印加される駆動波形は第６図のようになる。第１の
実施例と同様に、走査電極１に選択信号が印加されたと
き、可変抵抗７を用いて配向膜の膜厚による電圧差を相
殺することにより、液晶表示素子３全体で液晶層13に印
加される電圧を均一化することができる。また、走査電
極１に非選択信号が印加されたとき、駆動波形は表示特
性に液晶しない低い電圧に設定することにより、良好な
表示状態を維持することができる。When the liquid crystal display element 3 is driven by the two-pulse simultaneous erasing method using the liquid crystal driving voltage shown in FIG. 5, the driving waveform applied between the electrodes is as shown in FIG. As in the first embodiment, when a selection signal is applied to the scan electrode 1, the voltage difference due to the thickness of the alignment film is canceled by using the variable resistor 7, so that the liquid crystal layer Can be made uniform. In addition, when a non-selection signal is applied to the scan electrode 1, a good display state can be maintained by setting the drive waveform to a low voltage that does not cause liquid crystal display characteristics.
このように、信号電極２に対して平行な方向に配向膜
16の膜厚差を有する液晶表示素子３は、液晶層13に印加
される電圧が均一になるように信号電極２に接続した少
なくとも片側の駆動用LSI10に入力する液晶駆動電圧を
調整することにより、均一な表示が得られる。As described above, the alignment film is oriented in a direction parallel to the signal electrode 2.
The liquid crystal display element 3 having a film thickness difference of 16 can adjust the liquid crystal driving voltage input to at least one driving LSI 10 connected to the signal electrode 2 so that the voltage applied to the liquid crystal layer 13 becomes uniform. And a uniform display can be obtained.
（実施例３） 第７図は本発明の第３の実施例の説明図である。液晶
表示素子３の走査電極１と信号電極２の各々片側に駆動
用LSIX1〜X4,Y1〜Y5を接続した構成である。各駆動用LS
Iの液晶駆動電圧がそれぞれ異なり、各画素の液晶層13
に印加される電圧が電極抵抗の電圧降下を補正した電圧
となるように液晶駆動電圧を設定する。(Embodiment 3) FIG. 7 is an explanatory diagram of a third embodiment of the present invention. In this configuration, driving LSIX1 to X4 and Y1 to Y5 are connected to one side of each of the scanning electrode 1 and the signal electrode 2 of the liquid crystal display element 3. LS for each drive
The liquid crystal drive voltage of I is different, and the liquid crystal layer 13 of each pixel
The liquid crystal driving voltage is set so that the voltage applied to the liquid crystal becomes a voltage obtained by correcting the voltage drop of the electrode resistance.
たとえば、走査電極１の駆動用LSIX1〜X4のうち、X4
には第２図（ａ）に示す液晶駆動電圧設定回路により、
液晶駆動電圧を設定し、X1〜X3には第２図（ｂ）に示す
液晶駆動電圧設定回路により液晶駆動電圧を設定する。
また信号電極駆動用LSIY1〜Y5のうち、Y5には第５図
（ａ）に示す液晶駆動電圧設定回路により液晶駆動電圧
を設定し、Y1〜Y4には第５図（ｂ）に示す液晶駆動電圧
設定回路により液晶駆動電圧を設定する。さらに、各液
晶駆動電圧が、V0＞V0X3＞V0X2＞V0X1＞V1＞V1X3＞V1X2
＞V1X1＞V2＝V3＞V4X1＞V4X2＞V4X3＞V4＞V5X1＞V5X2＞
V5X3＞V5,V0＞V0Y4＞V0Y3＞V0Y2＞V0Y1＞V1＞V3Y1＞V
3Y2＞V3Y3＞V3Y4＞V3＝V2＞V2Y4＞V2Y3＞V2Y2＞V2Y1＞V
4＞V5Y1＞V5Y2＞V5Y3＞V5Y4＞V5なるように、可変抵抗
5,7を調整する。このような駆動回路構成を用いて強誘
電性液晶の２パルス複数同時消去法で駆動したとき、電
極間に印加される駆動波形は第８図のようになる。すな
わち、走査電極１に選択信号が印加されたとき、駆動波
形は各駆動用LSIの接続部から遠い画素ほど電圧が高く
なるので、可変抵抗5,7を用いて電極抵抗による電圧降
下を補正することにより、各画素の液晶層に印加される
電圧を液晶表示素子３全体にわたって均一化することが
できる。また、走査電極１に非選択信号が印加されたと
き、駆動波形は各画素によって異なるが、液晶層13に印
加される電圧が液晶表示全体で均一とならなくとも、そ
の電圧が表示特性に影響しない低い電圧に設定すること
により、良好な表示状態を維持することができる。For example, among the driving LSIs 1 to X4 for the scan electrode 1, X4
The liquid crystal drive voltage setting circuit shown in FIG.
A liquid crystal drive voltage is set, and a liquid crystal drive voltage is set in X1 to X3 by a liquid crystal drive voltage setting circuit shown in FIG. 2 (b).
Among the signal electrode driving LSIs Y1 to Y5, a liquid crystal driving voltage is set to Y5 by a liquid crystal driving voltage setting circuit shown in FIG. 5A, and a liquid crystal driving voltage shown in FIG. 5B is set to Y1 to Y4. The liquid crystal drive voltage is set by the voltage setting circuit. Further, each liquid crystal drive voltage is V 0 > V 0X3 > V 0X2 > V 0X1 > V 1 > V 1X3 > V 1X2
> V 1X1> V 2 = V 3> V 4X1> V 4X2> V 4X3> V 4> V 5X1> V 5X2>
V 5X3> V 5, V 0 > V 0Y4> V 0Y3> V 0Y2> V 0Y1> V 1> V 3Y1> V
3Y2> V 3Y3> V 3Y4> V 3 = V 2> V 2Y4> V 2Y3> V 2Y2> V 2Y1> V
4> V 5Y1> V 5Y2> V 5Y3> V 5Y4> V 5 becomes, the variable resistor
Adjust 5,7. When the ferroelectric liquid crystal is driven by the simultaneous two-pulse multiple erasing method using such a driving circuit configuration, the driving waveform applied between the electrodes is as shown in FIG. That is, when the selection signal is applied to the scanning electrode 1, the driving waveform has a higher voltage in a pixel farther from the connection portion of each driving LSI, so that the voltage drop due to the electrode resistance is corrected using the variable resistors 5 and 7. Thereby, the voltage applied to the liquid crystal layer of each pixel can be made uniform over the entire liquid crystal display element 3. When a non-selection signal is applied to the scanning electrode 1, the driving waveform differs for each pixel, but even if the voltage applied to the liquid crystal layer 13 is not uniform throughout the liquid crystal display, the voltage affects the display characteristics. A good display state can be maintained by setting the voltage to a low level that does not cause a problem.
このように、液晶表示素子３の走査電極１と信号電極
２の各々片側のみに駆動用LSIを接続し、電極抵抗によ
る電圧降下分を補正するように各駆動用LSIの液晶駆動
電圧を設定することにより、均一な表示が得られる。ま
た、従来例の第11図（ｂ），（ｃ），（ｄ）の構成の液
晶表示装置は、本実施例の構成とすることが容易にでき
るため、液晶表示素子３に接続する駆動用LSIの数を減
少させてコストを低減させることができる。As described above, the driving LSI is connected to only one side of each of the scanning electrode 1 and the signal electrode 2 of the liquid crystal display element 3, and the liquid crystal driving voltage of each driving LSI is set so as to correct the voltage drop due to the electrode resistance. Thereby, a uniform display can be obtained. Further, the conventional liquid crystal display device having the structure shown in FIGS. 11 (b), (c), and (d) can easily have the structure of this embodiment. Costs can be reduced by reducing the number of LSIs.
なお、本実施例では、斜方蒸着膜を用いた強誘電性液
晶表示素子について説明したが、他の構成の液晶表示素
子、たとえば、ポリイミド配向膜を用いたTN液晶の表示
素子などについても、本発明による構成の駆動回路によ
り、液晶層への印加電圧を液晶表示素子内で均一化する
ことができ、同様の効果を得ることができる。In the present embodiment, a ferroelectric liquid crystal display element using an obliquely deposited film has been described.However, a liquid crystal display element having another configuration, for example, a TN liquid crystal display element using a polyimide alignment film, etc. With the drive circuit having the configuration according to the present invention, the voltage applied to the liquid crystal layer can be made uniform within the liquid crystal display element, and the same effect can be obtained.
発明の効果 以上のように本発明によれば、液晶表示素子に接続し
た複数の駆動用LSIの少なくとも１個に、他の駆動用LSI
と異なる液晶駆動電圧を入力する液晶表示装置とするこ
とにより、配向膜の膜厚差などがある液晶表示素子の表
示を均一化することができ、また、大面積あるいは高密
度画素の液晶表示素子の電極抵抗による表示の不均一に
対しても表示を均一化することができる。さらに、信号
電極，走査電極とも片側給電により駆動することができ
るため、駆動用LSIの個数を減少させてコストを低減す
ることができる。As described above, according to the present invention, at least one of a plurality of driving LSIs connected to a liquid crystal display element includes another driving LSI.
By using a liquid crystal display device that inputs a different liquid crystal drive voltage, it is possible to make the display of a liquid crystal display element having a difference in the thickness of an alignment film and the like uniform. The display can be made uniform even if the display is not uniform due to the electrode resistance. Furthermore, since both the signal electrode and the scanning electrode can be driven by one-sided power supply, the number of driving LSIs can be reduced, and the cost can be reduced.
第１図は本発明の第１の実施例の説明図、第２図
（ａ），（ｂ），（ｃ）は本発明の第１の実施例の液晶
駆動電圧設定例の説明図、第３図は本発明の第１の実施
例の駆動波形の説明図、第４図は本発明の第２の実施例
の説明図、第５図（ａ），（ｂ），（ｃ）は本発明の第
２の実施例の液晶駆動電圧設定例の説明図、第６図は本
発明の第２の実施例の駆動波形の説明図、第７図は本発
明の第３の実施例の説明図、第８図は本発明の第３の実
施例の駆動波形の説明図、第９図（ａ）は液晶駆動電圧
回路のブロック回路図、第９図（ｂ）は第９図（ａ）の
要部の電圧波形図、第10図は従来の液晶駆動電圧設定回
路図、第11図（ａ），（ｂ），（ｃ），（ｄ）は従来の
液晶表示装置の説明図、第12図は斜方蒸着の説明図、第
13図は配向膜の膜厚差を有する液晶表示素子の断面図で
ある。 １……走査電極、２……信号電極、３……液晶表示素
子、4,6,X1,X2,X3,X4……走査電極駆動用LSI、8,10,Y1,
Y2,Y3,Y4,Y5……信号電極駆動用LSI、5,7……可変抵
抗、12……蒸着方向、13……液晶層、14……シール剤、
15……基板、16……SiO斜方蒸着膜、17……SiO蒸着源、
A,B……走査電極駆動回路、C,D……信号電極駆動回路。FIG. 1 is an explanatory view of a first embodiment of the present invention, and FIGS. 2 (a), 2 (b) and 2 (c) are explanatory views of a liquid crystal driving voltage setting example of the first embodiment of the present invention. 3 is an explanatory diagram of a driving waveform according to the first embodiment of the present invention, FIG. 4 is an explanatory diagram of the second embodiment of the present invention, and FIGS. 5 (a), (b) and (c) are diagrams of the present embodiment. FIG. 6 is an explanatory diagram of a liquid crystal drive voltage setting example according to a second embodiment of the present invention, FIG. 6 is an explanatory diagram of drive waveforms according to a second embodiment of the present invention, and FIG. 7 is a description of a third embodiment of the present invention. FIGS. 8 and 9 are explanatory diagrams of driving waveforms according to the third embodiment of the present invention. FIG. 9 (a) is a block circuit diagram of a liquid crystal driving voltage circuit, and FIG. 9 (b) is FIG. 9 (a). FIG. 10 is a circuit diagram of a conventional liquid crystal drive voltage setting circuit, FIGS. 11 (a), (b), (c) and (d) are explanatory diagrams of a conventional liquid crystal display device. Figure 12 is an illustration of oblique deposition,
FIG. 13 is a cross-sectional view of a liquid crystal display element having a difference in the thickness of the alignment film. 1 ... scanning electrode, 2 ... signal electrode, 3 ... liquid crystal display element, 4, 6, X1, X2, X3, X4 ... scanning electrode driving LSI, 8, 10, Y1,
Y2, Y3, Y4, Y5: Signal electrode driving LSI, 5, 7, Variable resistance, 12: Vapor deposition direction, 13: Liquid crystal layer, 14: Sealant,
15 ... substrate, 16 ... SiO oblique deposition film, 17 ... SiO deposition source,
A, B: Scan electrode drive circuit, C, D: Signal electrode drive circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 久光 伸二 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 昭62−232622（ＪＰ，Ａ) 特開 昭63−175890（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Hisamitsu 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References 175890 (JP, A)
Claims (3)
子の走査電極と信号電極とに各々複数の駆動用半導体素
子を接続し、前記走査電極側駆動用半導体素子の少なく
とも１個に他の駆動用半導体素子と異なる液晶駆動電圧
を入力することを特徴とする液晶表示装置。A plurality of driving semiconductor elements are connected to a scanning electrode and a signal electrode of a liquid crystal display element having a scanning electrode and a signal electrode, respectively, and at least one of the scanning electrode-side driving semiconductor elements is connected to another driving semiconductor element. A liquid crystal display device, wherein a liquid crystal driving voltage different from that of the driving semiconductor element is input.
子の走査電極と信号電極とに各々複数の駆動用半導体素
子を接続し、前記信号電極側駆動用半導体素子の少なく
とも１個に他の駆動用半導体素子と異なる液晶駆動電圧
を入力することを特徴とする液晶表示装置。2. A liquid crystal display device having a scanning electrode and a signal electrode, wherein a plurality of driving semiconductor elements are respectively connected to the scanning electrode and the signal electrode, and at least one of the signal electrode side driving semiconductor elements is connected to another driving semiconductor element. A liquid crystal display device, wherein a liquid crystal driving voltage different from that of the driving semiconductor element is input.
子の走査電極と信号電極とに各々複数の駆動用半導体素
子を接続し、前記走査電極側駆動用半導体素子の少なく
とも１個に他の駆動用半導体素子と異なる液晶駆動電圧
を入力し、かつ前記信号電極側駆動用半導体素子の少な
くとも１個に他の駆動用半導体素子と異なる液晶駆動電
圧を入力することを特徴とする液晶表示装置。3. A plurality of driving semiconductor elements are connected to a scanning electrode and a signal electrode of a liquid crystal display element having a scanning electrode and a signal electrode, respectively, and at least one of the scanning electrode side driving semiconductor elements is connected to another driving semiconductor element. A liquid crystal display device, wherein a liquid crystal drive voltage different from the drive semiconductor element is input, and a liquid crystal drive voltage different from the other drive semiconductor elements is input to at least one of the signal electrode side drive semiconductor elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175830A JP2928274B2 (en) | 1989-07-07 | 1989-07-07 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1175830A JP2928274B2 (en) | 1989-07-07 | 1989-07-07 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0339930A JPH0339930A (en) | 1991-02-20 |
| JP2928274B2 true JP2928274B2 (en) | 1999-08-03 |
Family
ID=16002965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1175830A Expired - Fee Related JP2928274B2 (en) | 1989-07-07 | 1989-07-07 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2928274B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06156667A (en) * | 1992-11-13 | 1994-06-03 | Mitsubishi Motors Corp | Shuttle conveyor device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62232622A (en) * | 1986-04-03 | 1987-10-13 | Sharp Corp | Matrix type liquid crystal panel device |
| JP2608403B2 (en) * | 1987-01-17 | 1997-05-07 | 富士通株式会社 | Driving method of active matrix type liquid crystal panel |
-
1989
- 1989-07-07 JP JP1175830A patent/JP2928274B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339930A (en) | 1991-02-20 |
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