JPH045629A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH045629A JPH045629A JP10625690A JP10625690A JPH045629A JP H045629 A JPH045629 A JP H045629A JP 10625690 A JP10625690 A JP 10625690A JP 10625690 A JP10625690 A JP 10625690A JP H045629 A JPH045629 A JP H045629A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- display device
- alignment
- electric field
- crystal 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 49
- 230000005684 electric field Effects 0.000 claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000010408 film Substances 0.000 description 37
- 206010047571 Visual impairment Diseases 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 229910021417 amorphous silicon Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000005281 excited state Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は液晶表示装置に関し、特にＴＦＴ素子を備えた
液晶表示装置の配向膜の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a liquid crystal display device, and more particularly to an improvement of an alignment film of a liquid crystal display device equipped with a TFT element.
（ロ）従来の技術
第１図は一般的な液晶表示装置を示す要部断面図であり
、（１０〉は第１のガラス基板、（１１）は第１のガラ
ス基板（１０）上に窒化シリコンからなる絶縁膜（１２
）を介して行列配置きれ、マトリクスセグメントを構成
するＩＴＯからなる透明電極、（１３）・・・は上記透
明電極（１１）（１１）・・・間隙を縦方向に複数本並
列配置されたアモルファスシリコン膜であり、絶縁膜（
１２）上に設けられている。（１４〉・・・は各アモル
ファスシリコン膜（１３）・・・の左側辺上に絶縁膜（
１２）を介して一部重畳した状態で縦方向に複数本並列
配置されたアルミニウム膜からなるドレインラインであ
る。 （１５）（１５）・・・は各アモルファスシリコ
ン膜（１３）・・・の右側辺上に絶縁膜（１２）を介し
て一部重畳した状態で各透明電極（１１）（１１）・・
・に対応配置されたアルミニウム膜からなるソース電極
膜であり、その右側辺は各透明電極（１１）（１１）・
・・の左下端部と接続されている。（１６）・・・は上
記透明電極（１１）（１１）・・・間隙位置を横方向に
複数本並列配置されて上記第１のガラス基板（１０）と
絶縁膜（１２）との間に形成された金とクロムの２層膜
からなるゲートラインであり、該ライン（１６〉・・・
には上記各ソース電極（１４）・・・とドレインライン
（１５）・・・との間隙位置のアモルファスシリコン膜
（１３）・・・下のゲート電極膜（１７）・・・が一体
に形成きれている。即ち、図中りで示すドレインライン
（１４）・・・箇所のドレイン電極膜と、Ｓで示すソー
ス電極膜（１５）・・・と、Ｇで示すゲート電極膜（１
７）・・・と、これ等電極膜り、Ｓ、Ｇに結合している
アモルファスシリコン膜（１３）・・・箇所とに依って
薄膜ＦＥＴからなるスイッチングトランジスタが構成さ
れており、各透明電極（１１）（１１）・・・は夫々に
対応したこのスイッチングトランジスタを介してドレイ
ンライン（１４）・・・に接続されるのである。 （１
Ｂ）は上記各透明電極（１１）（１１）・・・及びドレ
インライン（１４）・・・を−面に被覆した配向膜であ
る。(b) Conventional technology Figure 1 is a cross-sectional view of a main part of a general liquid crystal display device, in which (10> is a first glass substrate, (11) is a nitrided film on the first glass substrate (10)). Insulating film made of silicon (12
) are arranged in rows and columns through transparent electrodes made of ITO that constitute matrix segments, (13)... are the above transparent electrodes (11) (11)... Amorphous electrodes arranged in parallel in the vertical direction with gaps between them. It is a silicon film and an insulating film (
12) Provided above. (14>... is an insulating film (
12) is a drain line made of a plurality of aluminum films arranged in parallel in the vertical direction in a partially overlapping state. (15) (15)... are the transparent electrodes (11) (11)... which are partially overlapped on the right side of each amorphous silicon film (13)... via the insulating film (12).
A source electrode film made of an aluminum film arranged corresponding to the transparent electrodes (11), (11), and the right side thereof.
It is connected to the lower left end of... (16) . . . are the transparent electrodes (11) (11) . . . a plurality of transparent electrodes (11) are arranged in parallel in the lateral direction between the first glass substrate (10) and the insulating film (12). This is a gate line made of a two-layer film of gold and chromium, and the line (16〉...
The amorphous silicon film (13) at the gap between each of the source electrodes (14) and the drain line (15) is formed integrally with the lower gate electrode film (17). It's broken. In other words, the drain line (14) shown in the figure is a drain electrode film, the source electrode film (15) is shown as S, and the gate electrode film (1 is shown as G).
7)... and these electrode films, and the amorphous silicon film (13)... connected to S and G constitute a switching transistor consisting of a thin film FET, and each transparent electrode (11), (11)... are connected to the drain lines (14)... through the corresponding switching transistors. (1
B) is an alignment film in which each of the transparent electrodes (11), (11), and the drain line (14) are coated on the negative side.
一方、（２０）は第２のガラス基板であり、その下面、
即ち第１のガラス基板（１０）と対向する面には一面に
共通電極（２１）、配向膜（２８）が順次形成されてい
る。On the other hand, (20) is the second glass substrate, the lower surface of which
That is, a common electrode (21) and an alignment film (28) are sequentially formed on the surface facing the first glass substrate (10).
（３）は上記側基板（１０） 、 （２０）間に封入さ
れた液晶物質であり、各マトリクスセグメント毎に上記
スイッチングトランジスタがＯＮする事に依って電圧が
印加される第１のガラス基板（１ｏ）の透明電極（１１
）箇所の液晶物質（５）が電気光学効果を引き起こす事
となり、パネル全体でＴＶ画像が表示できるのである。(3) is a liquid crystal substance sealed between the side substrates (10) and (20), and a first glass substrate ( 1o) transparent electrode (11
The liquid crystal material (5) in ) causes an electro-optical effect, allowing TV images to be displayed on the entire panel.
（ハ）発明が解決しようとする課題
しかしながら、従来構造のＴＦＴ素子を備えた液晶表示
装置では、ＴＦＴ素子の構造、即ち、ＴＦＴのゲート電
極とソース電極との重畳する領域において、ゲート容量
Ｃｇｓが必らず発生する。そのゲート容量Ｃｇｓは液晶
を表示し、消去したときの表示残像を発生させるために
表示品位が低下する問題となっている。(c) Problems to be Solved by the Invention However, in a liquid crystal display device equipped with a TFT element of a conventional structure, the gate capacitance Cgs is small in the structure of the TFT element, that is, in the region where the gate electrode and source electrode of the TFT overlap. It definitely happens. The gate capacitance Cgs causes a display afterimage when the liquid crystal is displayed and erased, resulting in a problem of deterioration of display quality.
この問題はＴＦＴ素子を備えた液晶表示装置において避
けられない問題である。This problem is unavoidable in liquid crystal display devices equipped with TFT elements.
以下に上述した表示残像が発生する理由を簡単に述べる
。The reason why the above-mentioned display afterimage occurs will be briefly described below.
第２図はＴＦＴ素子を備えた液晶表示装置の１画素の等
価回路図である。ＣｇｓはＴＦＴのゲート電極−ソース
電極間の寄生容量、ｃＬｏは液晶層の容量、Ｃ３゜は補
助容量である。FIG. 2 is an equivalent circuit diagram of one pixel of a liquid crystal display device equipped with a TFT element. Cgs is the parasitic capacitance between the gate electrode and source electrode of the TFT, cLo is the capacitance of the liquid crystal layer, and C3° is the auxiliary capacitance.
先ず、ＴＦＴ素子のゲートがＯＦＦのとき、ゲート対極
間には常に■。（例えば−１０〜−１５■）のＤＣ電圧
が印加されているので液晶層には下記の式（１）に示し
たＤＣ成分が印加されることになる。First, when the gate of the TFT element is OFF, there is always ■ between the gate electrode and the opposite electrode. Since a DC voltage of (for example, -10 to -15 cm) is applied, a DC component shown in the following equation (1) is applied to the liquid crystal layer.
このＤＣ成分ｖＬｃが液晶層に印加されるため、第３図
に示す様に印加したドレイン電圧に対して、実際に液晶
層に印加される電圧は、負の方向（点線）ヘシフトする
。ここでｃＬｃは液晶の表示状態によって異なる。即ち
、液晶が完全に立っていれば（励起している状態）誘電
率εが最大となりＣＬＣも最大となる。また、液晶が完
全に寝ていれば（励起していない状態）誘電率εは最小
となり、Ｃ１ｃも最小となる。ＣＬｃが変化すれば上記
（１）式のｖＬｃも変化する。即ち、表示状＠（黒、白
、中間調）によりＶＬｃは異なり、液晶が立っていると
き（励起状態） （Ｎｏｒｍａｌ Ｂｌａｃｋでは白表
示）はＶＬＣの絶対値が小さくなる、液晶が寝ていると
き（励起しない状態） （Ｎｏｒｍａｌ Ｂｌａｃｋで
は黒表示）はＶＬＣの絶対値が大きくなる。Since this DC component vLc is applied to the liquid crystal layer, the voltage actually applied to the liquid crystal layer shifts in the negative direction (dotted line) with respect to the applied drain voltage as shown in FIG. Here, cLc varies depending on the display state of the liquid crystal. That is, if the liquid crystal is completely erect (in an excited state), the dielectric constant ε will be maximum and CLC will also be maximum. Furthermore, if the liquid crystal is completely lying down (in an unexcited state), the dielectric constant ε will be the minimum, and C1c will also be the minimum. If CLc changes, vLc in the above equation (1) also changes. In other words, VLC differs depending on the display state (black, white, halftone), and the absolute value of VLC is small when the liquid crystal is standing (excited state) (white display in normal black), and when the liquid crystal is lying down. (Non-excited state) (Displayed in black in Normal Black), the absolute value of VLC becomes large.
従って第３図で示す如く、対極電極Ｖ ＣＯＭはｖＬｃ
を小キ＜シようとして、第３図の如く、ドレイン電極の
センター値をシフトさせる電圧であるが、これは中間調
表示の状態で設定きれる。従ってｖｏ。、調整後は以下
のＤＣ成分ΔｖＬｏが液晶層に印加きれることになる。Therefore, as shown in FIG. 3, the counter electrode V COM is vLc
This voltage is used to shift the center value of the drain electrode as shown in FIG. 3 in order to reduce the voltage, but this voltage can be set in the state of halftone display. Therefore vo. , after adjustment, the following DC component ΔvLo can be applied to the liquid crystal layer.
ΔＶ ＬＣ” Ｖ ＬＣＶ ＣＯＭ
の表示状態により、ＶＬＣの太ききは異なるため、Δｖ
Ｌｃの太ききも異なることになる。Since the thickness of VLC differs depending on the display state of ΔV LC” V LCV COM, Δv
The thickness of Lc will also be different.
液晶層に一定時間ＤＣ成分ΔＶＬ０が印加きれると、第
４図（ａ）の如く、液晶層内で電荷の移動が起こる。移
動した電荷は、ＤＣ成分ΔＶＬＣを取り除いても同図（
ｂ）の様に液晶層内で内部電荷−ｖｏｌが発生し、保た
れるのでＤＣ成分が加わり表示の残像となる。When the DC component ΔVL0 is applied to the liquid crystal layer for a certain period of time, charge movement occurs within the liquid crystal layer as shown in FIG. 4(a). The transferred charge remains as shown in the same figure (
As shown in b), an internal charge -vol is generated and maintained within the liquid crystal layer, and a DC component is added, resulting in an afterimage of the display.
（ニ）課題を解決するための手段
本発明は上述した課題に鑑みて為されたものであり、マ
トリックス状に配列された複数の画素電極およびＴＦＴ
素子が形成された一方の透明基板と前記画素電極と対向
する対向電極が形成された他方の透明基板と前記夫々の
透明基板の表面に液晶分子を配向させるために形成され
た配向膜とを備えた液晶表示装置において、前記配向膜
は成分が異なる２種以上の配向材料が混合された配向膜
であることを特徴とし、更に詳述すると前記配向膜の１
つの材料は前記ＴＦＴ素子のオン時に発生するＤＣと同
じ方向に内部電界が生じる配向材料であり、もう１つの
材料は前記ＴＦＴ素子のオン時に発生するＤＣと逆方向
に内部電界が生じる配向材料を用いたことを特徴とする
。(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned problems, and includes a plurality of pixel electrodes and TFTs arranged in a matrix.
One transparent substrate on which an element is formed, the other transparent substrate on which a counter electrode facing the pixel electrode is formed, and an alignment film formed on the surface of each of the transparent substrates for aligning liquid crystal molecules. In the liquid crystal display device, the alignment film is characterized in that it is an alignment film in which two or more kinds of alignment materials having different components are mixed, and more specifically, one of the alignment films is
One material is an alignment material that generates an internal electric field in the same direction as the DC generated when the TFT element is turned on, and the other material is an alignment material that generates an internal electric field in the opposite direction to the DC generated when the TFT element is turned on. It is characterized by the fact that it was used.
（＊）作用
この様に本発明に依れば液晶を配向させる配向膜材料の
材質を２種以上混合許せ、その１つの材質にＤＣ成分と
同一方向となる配向材料を用い、もう１つの材質にＤＣ
成分と逆方向の配向材料を用いることにより、ＴＦＴ構
造液晶表示装置において必らず発生するＤＣ成分ΔＶＬ
Ｃによって生ずる液晶層内での内部電界Ｖ。、を著しく
抑制することができる。その結果、表示の残像を全く発
生することのない液晶表示装置の提供ができる。(*) Effect As described above, according to the present invention, it is possible to mix two or more types of alignment film materials for aligning liquid crystals, and one of the materials is an alignment material that is in the same direction as the DC component, and the other material is to DC
By using an alignment material in the opposite direction to the component, the DC component ΔVL that always occurs in TFT structure liquid crystal display devices can be reduced.
The internal electric field V within the liquid crystal layer caused by C. , can be significantly suppressed. As a result, it is possible to provide a liquid crystal display device that does not generate any display afterimages.
（へ）実施例
以下に図面に示した実施例に基づいて本発明を詳述する
。(f) Examples The present invention will be described in detail below based on examples shown in the drawings.
本発明の液晶表示装置は従来例で（第１図）で示した一
般的な構造と変わらないため、ここでの説明は省略する
。従って実施例においては本発明の特徴とする配向膜（
１Ｂ）（２８）について述べる。Since the liquid crystal display device of the present invention is the same as the general structure shown in the conventional example (FIG. 1), the explanation here will be omitted. Therefore, in the examples, the alignment film (
1B) (28) will be described.
本発明の配向膜は２種以上の配向材料が混合されている
。即ち、本実施例での配向材料の１つは外部ＤＣ成分と
同一方向に内部電荷が生じる配向材料であり（以下正の
配向材料という）、もう１つの材料は外部ＤＣ成分と逆
方向に内部電荷が生じる配向材料（以下負の配向材料と
いう）を用いることが本発明の最大の特徴である。The alignment film of the present invention is a mixture of two or more types of alignment materials. That is, one of the alignment materials in this example is an alignment material in which internal charges occur in the same direction as the external DC component (hereinafter referred to as positive alignment material), and the other material generates internal charges in the opposite direction to the external DC component. The greatest feature of the present invention is the use of an alignment material that generates electric charges (hereinafter referred to as negative alignment material).
正の配向材料としては東し■ＬＰ−７２Ａを用い、負の
配向材料としては日本合成ゴム＠ＪＩＢ〜７５を用いる
。As the positive orientation material, Toshi ■ LP-72A is used, and as the negative orientation material, Japan Synthetic Rubber@JIB~75 is used.
それらの正負の配向材料の混合はその材料の溶媒濃度に
より異なるが、ＤＣ成分ΔＶ ＬＣにより発生する液晶
層内での内部電荷Ｖ。３が０となる様に混合すればよい
。従ってそれらの正負の配向材料の混合比は各種の材質
あるいは条件によって異なり、内部電荷Ｖ。３が０とな
る様に設定すればよい。The mixture of these positive and negative alignment materials depends on the solvent concentration of the materials, but the DC component ΔV is the internal charge V in the liquid crystal layer generated by LC. They should be mixed so that 3 becomes 0. Therefore, the mixing ratio of these positive and negative orientation materials varies depending on the various materials or conditions, and the internal charge V. It may be set so that 3 becomes 0.
ところで、配向膜材料による残像の大きさの評価として
フリッカ−法なるものが存在する。このフリッカ−法と
は液晶セルにＤＣＩＯＶを一定の時間印加すると、液晶
層内に内部電界−Ｖ ｏｎが生じる。ＤＣｌｏＶを取り
去り中間調表示を得る電圧−矩形波３０Ｈｚのｖｏ、を
印加すると、内部電界ｙ ｏｓのためにフリッカ−が発
生する。このフリッカ−を所定のシンクロ装置によって
読み取れば液晶層内に発生した内部電界Ｖ。３を正確に
求めることができる。この内部電界Ｖ。、が小さければ
小さいほど残像の発生はなくなる。By the way, there is a flicker method for evaluating the size of afterimages caused by alignment film materials. In this flicker method, when DCIOV is applied to a liquid crystal cell for a certain period of time, an internal electric field -Von is generated within the liquid crystal layer. When DCLoV is removed and a voltage of 30 Hz rectangular wave vo is applied to obtain a halftone display, flicker occurs due to the internal electric field yos. If this flicker is read by a predetermined synchronization device, it can be determined that the internal electric field V generated within the liquid crystal layer. 3 can be found accurately. This internal electric field V. The smaller , the less afterimages will occur.
第５図は本実施例で用いた負の配向材料に関する内部電
荷Ｖ。３の変化を示す特性図であり、第６図は正の配向
材料に関する内部電荷Ｖ ｏ ｓの変化を示す特性図で
ある。FIG. 5 shows the internal charge V regarding the negative orientation material used in this example. FIG. 6 is a characteristic diagram showing a change in internal charge V o s regarding a positively oriented material.
第５図に示す如く、本実施例で用いた負の配向材料にＤ
Ｃｌｏｖを印加しつつけると内部電界ｖｏｌは増加し飽
和する。また、ＤＣｌｏｖをの印加を停止すると内部電
界Ｖ。、は徐々に減少する。As shown in FIG. 5, D
As Clov continues to be applied, the internal electric field vol increases and becomes saturated. Also, when the application of DClov is stopped, the internal electric field V. , gradually decreases.
この負の配向材料では内部電界Ｖ。、が生じるために残
像が発生することがわかる。In this negatively oriented material the internal electric field V. It can be seen that the afterimage occurs due to the occurrence of .
第６図に示す如く、正の配向材料にＤＣＩＯＶを印加し
つづけると、内部電界■。３は減少し飽和する。またＤ
ＣＩＯＶの印加を停止すると内部電界Ｖ。３は減少する
。この正の配向材料でも内部電界Ｖ。３が生じるために
残像が発生することがわかる。As shown in FIG. 6, if DCIOV is continued to be applied to the positively oriented material, the internal electric field . 3 decreases and saturates. Also D
When the application of CIOV is stopped, the internal electric field V. 3 decreases. This positively oriented material also has an internal electric field V. It can be seen that the afterimage occurs due to the occurrence of the image 3.
第７図は本発明の配向膜の内部電界Ｖ。３の時間変化を
示す特性図である０本発明の配向膜は上述した様に正の
配向材料と負の配向材料とが所望の混合比で混合きれて
いるため、ＤＣｌｏｖを印加したときとしないときの差
、即ち、内部電界Ｖ。３０発生がないことがわかる。FIG. 7 shows the internal electric field V of the alignment film of the present invention. 3 is a characteristic diagram showing the time change of 0 As described above, in the alignment film of the present invention, the positive alignment material and the negative alignment material are mixed at the desired mixing ratio, so when DClov is applied and not. The difference in time, that is, the internal electric field V. It can be seen that no occurrence of 30% occurred.
本実施例では内部電界Ｖ。Ｓが発生しないが、正と負の
配向材料の混合比によっては多少の内部電界Ｖ。、が発
生するが従来の如き、残像をおこす様な内部電界Ｖ ｏ
ｓの発生はない。In this embodiment, the internal electric field is V. S is not generated, but some internal electric field V is generated depending on the mixing ratio of positive and negative orientation materials. , but as in the conventional case, an internal electric field V o that causes an afterimage is generated.
There is no occurrence of s.
本発明の配向膜は従来の配向膜と同様に基板上にスピン
コード、印刷等の手段によって塗布、焼成きれ、所定の
ラビング処理を行うことで形成することができる。The alignment film of the present invention can be formed in the same way as conventional alignment films by coating it on a substrate by means such as spin cording or printing, baking it, and then subjecting it to a predetermined rubbing process.
斯る本発明に依れば、配向膜に２種の配向材料を混合さ
せることにより、ΔＶＬＣによって生じる液晶層内の内
部電界Ｖ。ｌｌをなくすことができ、表示の残像および
表示ムラをなくすことが可能となる。According to the present invention, by mixing two types of alignment materials in the alignment film, the internal electric field V in the liquid crystal layer generated by ΔVLC. This makes it possible to eliminate display afterimages and display unevenness.
（ト）発明の効果
以上に詳述した如く、本発明に依れば、液晶を配向許せ
る配向膜材料の材質を２種以上混合させ、その１つの材
質に外部ＤＣ成分と同一方向となる配向材料を用い、も
う１つの材質に外部ＤＣ成分と逆方向の配向材料を用い
ることにより、ＴＦＴ構造液晶表示装置において必らず
発生するＤＣ成分ΔｖＬｏによって生ずる液晶層内での
内部電界Ｖ。、をほとんど無くすことができ、表示の残
像および表示ムラのない液晶表示装置の提供が実現でき
、その効果は極めて大である。(G) Effects of the Invention As detailed above, according to the present invention, two or more types of alignment film materials capable of aligning liquid crystal are mixed, and one of the materials has alignment that is in the same direction as the external DC component. By using a material with an orientation opposite to that of the external DC component as the other material, an internal electric field V in the liquid crystal layer is generated by the DC component ΔvLo that always occurs in a TFT structure liquid crystal display device. , can be almost eliminated, and it is possible to provide a liquid crystal display device that is free from display afterimages and display unevenness, and the effect is extremely large.
第１図は一般的な液晶表示装置を示す断面図、第２図は
ＴＦＴの一般的な等価回路図、第３図は液晶に印加され
る電圧波形図、第４図は液晶層内の電荷の移動を示す図
、第５図、第６図および第７図は内部電界の時間変化を
示す特性図である。
（１０）（２０）・・・ガラス基板、 （１１）（１２
）・・・透明電極、 り１３）・・・半導体層、 （１
４）・・・ドレイン電極、（１５）・・・ソース電極、
（１７）・・・ゲート電極、 （１８）（２８）・・
・配向膜である。
第１図
第３図
第２図
ｔ４５
図
印
第６．１１Figure 1 is a cross-sectional view of a typical liquid crystal display device, Figure 2 is a typical equivalent circuit diagram of a TFT, Figure 3 is a voltage waveform diagram applied to the liquid crystal, and Figure 4 is a diagram of electric charges within the liquid crystal layer. FIGS. 5, 6 and 7 are characteristic diagrams showing temporal changes in the internal electric field. (10)(20)...Glass substrate, (11)(12
)...Transparent electrode, 13)...Semiconductor layer, (1
4)...Drain electrode, (15)...Source electrode,
(17)...Gate electrode, (18)(28)...
・It is an alignment film. Fig. 1 Fig. 3 Fig. 2 t45 Figure mark No. 6.11
Claims (2)
びＴＦＴ素子が形成された一方の透明基板と 前記画素電極と対向する対向電極が形成された他方の透
明基板と 前記夫々の透明基板の表面に液晶分子を配向させるため
に形成された配向膜とを備えた液晶表示装置において、 前記配向膜は成分が異なる２種以上の配向材料が混合さ
れた配向膜であることを特徴とする液晶表示装置。(1) One transparent substrate on which a plurality of pixel electrodes and TFT elements arranged in a matrix are formed, the other transparent substrate on which a counter electrode facing the pixel electrodes is formed, and the surface of each of the transparent substrates. A liquid crystal display device comprising an alignment film formed to align liquid crystal molecules, wherein the alignment film is a mixture of two or more types of alignment materials having different components. .
時に発生するＤＣと同じ方向に内部電界が生じる配向材
料であり、もう１つの材料は前記ＴＦＴ素子のオン時に
発生するＤＣと逆方向に内部電界が生じる配向材料を用
いたことを特徴とする請求項１記載の液晶表示装置。(2) One material of the alignment film is an alignment material that generates an internal electric field in the same direction as the DC generated when the TFT element is turned on, and the other material is in a direction opposite to the DC generated when the TFT element is turned on. 2. The liquid crystal display device according to claim 1, further comprising an alignment material that generates an internal electric field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10625690A JP2911174B2 (en) | 1990-04-20 | 1990-04-20 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10625690A JP2911174B2 (en) | 1990-04-20 | 1990-04-20 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH045629A true JPH045629A (en) | 1992-01-09 |
| JP2911174B2 JP2911174B2 (en) | 1999-06-23 |
Family
ID=14429021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10625690A Expired - Lifetime JP2911174B2 (en) | 1990-04-20 | 1990-04-20 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2911174B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933202A (en) * | 1995-09-28 | 1999-08-03 | Nec Corporation | Liquid crystal display device having an alternating common electrode voltage |
-
1990
- 1990-04-20 JP JP10625690A patent/JP2911174B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933202A (en) * | 1995-09-28 | 1999-08-03 | Nec Corporation | Liquid crystal display device having an alternating common electrode voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2911174B2 (en) | 1999-06-23 |
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