JP4373071B2

JP4373071B2 - High-speed liquid crystal display device and driving method thereof

Info

Publication number: JP4373071B2
Application number: JP2002316865A
Authority: JP
Inventors: 直人広田
Original assignee: 大林精工株式会社
Priority date: 2002-09-10
Filing date: 2002-09-10
Publication date: 2009-11-25
Anticipated expiration: 2022-09-10
Also published as: JP2004102209A

Description

【０００１】
【産業上の利用分野】
本発明は、低コストで広視野角・高輝度・高速応答の大画面アクティブマトリックス型液晶ＴＶ表示装置に関する。
【０００２】
【従来の技術】
図１にあるように従来の垂直配向方式液晶表示装置は、カラーフィルター側基板の透明共通電極の上に、液晶分子の運動方向を制御するバンプを形成し、かつアクティブマトリックス基板の透明画素電極に、液晶分子の運動方向を制御するスリットをもうけ、これらのバンプとスリットが１組になって液晶分子の運動方向を決定する方式を採用している。カラーフィルター側基板にバンプのかわりに液晶分子の運動方向を制御するスリットを透明共通電極に形成する方式もある。これらの両方の方式ともに量産され実用化されている。
【０００３】
【発明が解決しようとする課題】
従来のマルチドメイン垂直配向方式液晶表示装置では、カラーフィルター基板に、バンプかスリットを透明共通電極に形成しなければならず、ホトマスク工程を１回ふやさなければならなかった。そのためにコストアップをさけることができなかった。
【０００４】
さらに図１にあるようなカラーフィルター側にバンプを形成する垂直配向方式液晶表示装置では、バンプの幅，高さ、傾斜面の角度を精密にコントロールしないと、液晶分子のたおれかたにバラツキが生じてしまい、中間調領域でムラが発生する。バンプの材質がポジ型ホトレジストであるために、有機溶剤を完全にとりのぞく必要があり、２００度以上の高温で焼きかためなければならず工程の短縮化が難かしい。ポジ型ホトレジストのバンプから液晶中に汚染物が溶出した場合、残像の現象が発生し信頼性の点でも問題となる。
【０００５】
従来のバンプを用いたカラーフィルター基板では、バンプの材料としてポジ型ホトレジストを用いるために、垂直配向膜の塗布工程で不良が発生した場合、リワークする時に酸素プラズマを用いたドライアッシング方法を用いることができない。そのために、ランニングコストの高いウェットリムーブ方法を用いなければならずリワークコストが非常に高くなるという欠点があった。
【０００６】
従来のバンプやスリットを用いる垂直配向方式液晶表示装置では黒表示から中間調表示または白表示から中間調表示に移る時の液晶の応答速度が遅いという欠点があった。
【０００７】
本発明は、上記の問題点を解決するものであり、その目的とする所は、大型の垂直配向方式液晶表示装置の信頼性を向上し、安価に短時間で製造できしかも明るく、応答速度のはやい液晶表示を実現することにある。
【０００８】
【課題を解決するための手段】
前記課題を解決し、上記目的を達成するために、本発明では、下記の手段を用いる。
【０００９】
〔手段１〕アクティブマトリックス基板とカラーフィルター基板に垂直配向された、負の誘電率異方性液晶分子に電圧を印加し、異なる２方向または、４方向に液晶分子をたおれさせるために下記の２種類の電極構造をアクティブマトリックス基板の１画素内に形成した。
ｉ）カラーフィルター基板側には透明なベタ共通電極を用いこれに対向するアクティブマトリックス基板側の透明画素電極には、細長いスリット状のパターン（スリット部には透明電極はない。）を形成する。
ｉｉ）カラーフィルター基板側には透明なベタ共通電極を用いこれに対向するアクティブマトリックス基板側の透明画素電極には、細長いスリット状のパターンが形成されており、透明画素電極の下層には、絶縁層をかいして、２行の互いに分離され、それぞれ異なる電位に設定されている液晶配向方向制御電極が存在し、このうちどちらか１方の液晶配向方向制御電極が、前記細長いスリット状のパターンの形状とほぼ同じ形状で、スリットよりもオーバーサイズになっており、かつ２行の互いに分離独立した液晶配向方向制御電極が、走査信号配線方向に、一定の画素周期ごとに互いにいれかわって透明画素電極に形成された細長いスリットの下層に配置されている。
【００１０】
〔手段２〕手段１の電極構造を有する垂直配向方式液晶表示装置の駆動法として下記の駆動方式を用いる。アクティブマトリックス基板側の各画素ごとに分離された透明画素電極の電位が、対向するカラーフィルター基板側わのベタ共通電極の電位よりも低い時に、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が透明画素電極の電位よりも低く設定されており、かく透明画素電極の電位が、対向するカラーフィルター基板側のベタ共通電極の電位よりも高い時に、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が、透明画素電極の電位よりも高く設定されており、かつ走査信号配線の両側に近接して配置されている液晶配向方向制御電極の電位が、お互いに異なった極性電位に設定されており、かつ透明画素電極の電位と１画素内に分離独立している２行の液晶配向方向制御電極のそれぞれの電位は、カラーフィルター基板側の共通電極の電位に対して垂直走査周期ごとに、極性を反転させる駆動方式を用いる。
【００１１】
〔手段３〕走査信号配線の方向に隣り合う透明画素電極が互いに異なる走査信号配線によって制御される薄膜トランジスタに接続されているカラーアクティブマトリックス型垂直配向方式液晶表示装置に関して、アクティブマトリックス基板とカラーフィルター基板間に垂直配向された液晶分子に電圧を印加し、異なる２方向または異なる４方向に液晶分子をたおれさせるために、下記の２種類の電極構造をアクティブマトリックス基板の１画素内に形成した。
ｉ）カラーフィルター基板側には透明なベタ共通電極を用い、これに対向するアクティブマトリックス基板側の透明画素電極には、細長いスリット状のパターン（スリット部には透明電極はない。）を形成する。
ｉｉ）カラーフィルター基板側には、透明なベタ共通電極を用い、これに対向するアクティブマトリックス基板側の透明画素電極には、細長いスリット状のパターンを形成し、このスリットの下層に絶縁膜をかいして、スリットの形状とほぼ同じ形状で、スリットよりもオーバーサイズになっている液晶配向方向制御電極を形成する。
【００１２】
〔手段４〕手段３の電極構造を有する垂直配向方式液晶表示装置の駆動法として下記の駆動方式を用いる。アクティブマトリックス基板側の各画素ごとに分離された透明画素電極の電位が対向するカラーフィルター基板側のベタ共通電極の電位よりも低い時に、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が透明画素電極の電位よりも低く設定されており、かつ透明画素電極の電位が対向するカラーフィルター基板側のベタ共通電極の電位よりも高い時には、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が、透明画素電極の電位よりも高く設定されており、かつ透明画素電極の電位と液晶配向方向制御電極の電位は、カラーフィルター基板側の共通電極の電位に対して、垂直走査周期ごとに、極性を反転させる駆動方式を用いる。
【００１３】
〔手段５〕アクティブマトリックス基板とカラーフィルター基板に垂直配向された負の誘電率異方性液晶分子に電圧を印加し多方向に液晶分子をたおれさせるために、下記の２種類の電極構造をアクティブマトリックス基板の１画素内に形成した。
ｉ）カラーフィルター基板側には透明なベタ電極を用い、これに対向するアクティブマトリックス基板側の透明画素電極には、円形または多角形の穴（穴の部分には透明電極はない。）を多数形成する。
ｉｉ）カラーフィルター基板側には透明なベタ電極を用い、これに対向するアクティブマトリックス基板側の透明画素電極には、細長いスリット状のパターンが形成されており、透明画素電極には、細長いスリット状のパターンが形成されており、透明画素電極の下層には、絶縁層をかいして、２行の互いに分離され、それぞれ異なる電位に設定されている液晶配向方向制御電極が存在し、このうちどちらか１方の液晶配向方向制御電極が、前記細長いスリット状のパターン形状とほぼ同じ形状でスリットよりもオーバーサイズになっており、かつ２行の互いに分離独立した液晶配向方向制御電極が、走査信号配線方向に、一定の画素周期ごとに、互いにいれかわって透明画素電極に形成された細長いスリットの下層に配置されている。
【００１４】
〔手段６〕手段５の電極構造を有する垂直配向方式液晶表示装置の駆動法として、下記の駆動方式を用いる。アクティブマトリックス基板側の各画素ごとに分離された透明画素電極の電位が、対向するカラーフィルター基板側のベタ共通電極の電位よりも低い時に、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が透明画素電極の電位よりも低く設定されており、かつ透明画素電極の電位が対向するカラーフィルター基板側のベタ共通電極の電位よりも高い時に、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が、透明画素電極の電位よりも高く設定されており、かつ走査信号配線の両側に近接して配置されている液晶配向方向制御電極の電位が、お互いに異なった極性電位に設定されており、かつ透明画素電極の電位と、１画素内に分離独立している２行の液晶配向方向制御電極のそれぞれの電位は、カラーフィルター基板側の共通電極の電位に対して垂直走査周期ごとに、極性を反転させる駆動方式を用いる。
【００１５】
〔手段７〕走査信号配線の方向に隣り合う透明画素電極が、互いに異なる走査信号配線によって制御される薄膜トランジスタに接続されているアクティブマトリックス型垂直配向方式液晶表示装置に関して、アクティブマトリックス基板とカラーフィルター基板間に垂直配向された液晶分子に電圧を印加し、多方向に液晶分子をたおれさせるために、下記の２種類の電極構造をアクティブマトリックス基板の１画素内に形成した。
ｉ）カラーフィルター基板側には透明なベタ電極を用いこれに対向するアクティブマトリックス基板側の透明画素電極には、円形または多角形の穴（穴の部分には、透明電極はない。）を多数形成する。
ｉｉ）カラーフィルター基板側には透明なベタ電極を用い、これに対向するアクティブマトリックス基板側の透明画素電極には、細長いスリット状のパターンを形成し、このスリットの下層に、絶縁膜をかいしてスリットの形状とほぼ同じ形状でスリットよりもオーバーサイズになっている液晶配向方向制御電極を形成する。
【００１６】
〔手段８〕手段７の電極構造を有する垂直配向方式液晶表示装置の駆動法として、下記の駆動方式を用いる。アクティブマトリックス基板側の各画素ごとに分離された透明画素電極の電位が、対向するカラーフィルター基板側のベタ共通電極の電位よりも低い時に、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が透明画素電極の電位よりも低く設定されており、かつ透明画素電極の電位が対向するカラーフィルター基板側のベタ共通電極の電位よりも高い時には、透明画素電極のスリットの下層に設置された液晶配向方向制御電極の電位が、透明画素電極の電位よりも高く設定されており、かつ透明画素電極の電位と、液晶配向方向制御電極の電位は、カラーフィルター基板側の共通電極の電位に対して、垂直走査周期ごとに、極性を反転させる駆動方式を用いる。
【００１７】
〔手段９〕手段１，３において、アクティブマトリックス基板側の透明画素電極に形成されている細長くのびたスリットと、液晶配向方向制御電極と組みになったスリットとが、走査信号配線方向に対してほぼ±４５度の角度の方向に、ほぼ平行な関係をたもちながら交互に配置されており、液晶セルの外部に設置する２枚の偏光板の偏光軸は、走査信号配線方向と、映像信号配線方向にそろえ互いに直交する配置とした。
【００１８】
〔手段１０〕手段１，３において、アクティブマトリックス基板側の透明画素電極に形成されている細長くのびたスリットが、走査信号配線の方向に対して±４５度の角度の方向に配置されており、かつ液晶配向方向制御電極と組みになっているスリットが走査信号配線方向に対して平行な方向と、直交する方向に配置されかつ画素電極の外周部を液晶配向方向制御電極が画素電極と絶縁膜をかいしてかさなりながらとりかこんでいる構造をしており、液晶セルの外部に設置する２枚の偏光板の偏光軸は、走査信号配線方向と映像信号配線方向にそろえ、互いに直交する配置とした。
【００１９】
〔手段１１〕手段１，３において、アクティブマトリックス基板側の透明画素電極に形成されている細長くのびたスリットが走査信号配線の方向に対して平行な方向と、直交する方向とに配置されかつ液晶配向方向制御電極と組みになっているスリットが、走査信号配線方向に対して平行に配置されており、かつ画素電極の外周部を液晶配向方向制御電極が、画素電極と絶縁膜をかいしてかさなりながらとりかこんでいる構造をしており、液晶セルの外部に設置する２枚の偏光板の偏光軸は、走査信号配線方向と映像信号配線方向にそろえ互いに直交する配置とした。
【００２０】
〔手段１２〕手段１，３において、アクティブマトリックス基板側の透明画素電極に形成されている細長くのびたスリットが、走査信号配線方向に対して平行な方向と、直交する方向に配置され、かつ液晶配向方向制御電極と組みになっているスリットが、走査信号配線方向に対して±４５度の角度の方向に配置されている構造をしており、液晶セルの外部に設置する２枚の偏光板の偏光軸は、走査信号配線方向と映像信号配線方向にそろえ互いに直交する配置とした。
【００２１】
〔手段１３〕手段５，７において、アクティブマトリックス基板側の透明画素電極に形成されている複数の円形または多角形のホールをとり囲むように液晶配向方向制御電極と組みになったスリットが走査信号配線方向に対して平行な方向と直交する方向に配置されており、かつ画素電極の外周部を液晶配向方向制御電極が画素電極と絶縁膜をかいしてかさなりながらとりかこんでいる構造としており、液晶セルの外部に設置する２枚の偏光板の偏光軸は、走査信号配線方向と映像信号配線方向にそろえ互いに直交する配置とした。
【００２２】
〔手段１４〕手段１，３，５，７において、透明画素電極のスリットの下層に絶縁物層をかいして形成された液晶配向方向制御電極が、走査信号配線形成時に同時に同じ層に形成されるようにした。
【００２３】
〔手段１５〕手段１，３，５，７において、透明画素電極のスリットの下層に絶縁物層をかいして形成された液晶配向方向制御電極と透明画素電極とで、付加容量を形成した。
【００２４】
〔手段１６〕手段１，５において、走査信号配線と液晶配向方向制御電極はすべて完全に分離独立しておりそれぞれ別の駆動ＩＣの出力端子に接続され、一行の画素を制御する２行の液晶配向方向制御電極の接続端子部は、異なる走査信号配線の接続端子部にはさまれるように配置されている。
【００２５】
〔手段１７〕手段３，７において、走査信号配線と液晶配向方向制御電極はすべて完全に分離独立しておりそれぞれ別の駆動ＩＣの出力端子に接続され、一行の画素を制御する一行の液晶配向方向制御電極の接続端子部は、異なる走査信号配線の接続端子部にはさまれるように配置されている。
【００２６】
〔手段１８〕手段１，３，５，７において、走査信号配線の接続端子部が表示画面部の左側または右側のどちらか１方に配置され、かつ液晶配向方向制御電極の接続端子部は、走査信号配線の接続端子部とは異なるもう一方側に配置され、それぞれの接続端子は完全に分離独立しており、それぞれ別の駆動ＩＣの出力端子に接続されている。
【００２７】
〔手段１９〕手段１，５において、走査信号配線と液晶配向方向制御電極はすべて完全に分離独立しており、それぞれの接続端子が表示画面の左右両側に配置されており、かつ１行の画素を制御する２行の液晶配向方向制御電極の接続端子部は、異なる走査信号配線の接続端子部にはさまれるように配置されている。
【００２８】
〔手段２０〕手段３，７において、走査信号配線と液晶配向方向制御電極は、すべて完全に分離独立しており、それぞれの接続端子が表示画面の左右両側に配置されており、かつ１行の画素を制御する１行の液晶配向方向制御電極の接続端子部は、異なる走査信号配線の接続端子部にはさまれるように配置されている。
【００２９】
〔手段２１〕手段２，４，６，８において、動画表示の時に、透明画素電極のスリットの下層に形成されている液晶配向方向制御電極と、透明画素電極間に印加されるバイアス電圧を、静止画表示の時よりも大きくし、負の誘電率異方性液晶分子のたおれる速度をはやくした。
【００３０】
【作用】
手段１，２，３，４，５，６，７，８を用いることで図２，図３図５，図６にしめされているように負の誘電率異方性液晶分子を垂直配向された状態から目的とする方向にたおれさせることが可能となります。これにより従来の図１にあるような垂直配向方式液晶表示装置のカラーフィルター側基板に形成しなければならなかった液晶分子の運動方向制御用バンプ▲５▼を形成する必要がなくなった。これにより図４にあるように安価なカラーフィルターを用いてマルチドメイン垂直配向方式液晶表示装置を作れるようになる。さらに図４から、わかるようにカラーフィルター側のベタ共通電極とアクティブマトリックス基板の透明画素電極のあいだには、配向膜と負の誘電率異方性液晶しか存在しないのでバンプ▲５▼からの汚染物の拡散などの問題が完全になくなり信頼性がいちじるしく向上する。
【００３１】
さらに、バンプ▲５▼がないので配向膜塗布が失敗しても、ドライアッシャーによる酸素プラズマで簡単に短時間で再生することができる。配向膜塗布前の表面処理に、ドライアッシャーを用いた酸素とアルゴンのプラズマ処理を用いることができるので配向膜塗布工程でのはじきやピンホールの発生を激減できる。
【００３２】
手段９，１０，１１，１２，１３を用いることで、偏光板の有効利用効率を大幅に向上することができ、超大型液晶表示装置で用いる偏光板のコストを低減できる。さらにバックライトで使用する２種類の材料の多層積層体からなる反射性偏光子の有効利用効率も同様に大幅に向上することができるので超大型液晶表示装置用バックライトのコストも低減できる。液晶分子の運動方向を４方向に制御できるので広い視野角も実現できる。
【００３３】
手段１４，１５を用いることで従来のアクティブマトリックス基板の製造工程を変更することなく、まったく同じプロセスで本発明のアクティブマトリックス基板を製造できる。さらに図７，図８，図９，図１０，図１４，図１６，図１７，図１８，図２５にあるように、液晶配向方向制御電極が映像信号配線の両側に近接して配置されているために、映像信号配線の電位変動がシールドされやすくなっている。このために、垂直方向のクロストークの発生を完全におさえることができる。
【００３０】
手段１６，１７，１８，１９，２０を用いることで各行の画素電極のスリットの下層に形成されている液晶配向方向制御電極を各行ごとに別々に駆動することが可能となり表示画面の上部、中部、下部ともに同じ条件で均一表示することができるようになります。
【００３１】
手段２，４，６，８，２１を用いることで負の誘電率異方性液晶分子を垂直配向された状態から目的とする方向にたおれさせることが可能となり、ディスクリネーションの発生を防止でき均一な中間調表示が可能となります。さらに従来の垂直配向方式液晶表示モードで問題となっていた黒表示から中間調表示、白表示から中間調表示への応答スピードの遅さが、本発明を用いることで大幅に改善できる。動画対応の時には、透明画素電極と透明画素電極のスリットの下層に形成された液晶配向方向制御電極との間に印加されるバイアス電圧を大きくすることで応答速度をさらに向上することが可能である。本発明では黒表示に近づけば近づくほど上記バイアス電圧が大きくなるように作用するため応答速度を全領域で改善することができる。
【００３２】
【実施例】
〔実施例１〕図４，図５，図６は、本発明の第１の実施例の断面図である。カラーフィルター基板にはベタ透明共通電極があり、この基板に対向してアクティブマトリックス基板が平行に配置されている。アクティブマトリックス基板はまず走査信号配線と液晶配向方向制御電極を同時に同じ層に形成した後、ゲート絶縁膜とアモルファスシリコン層とオーミックコンタクト用のｎ^＋アモルファスシリコン層を堆積する。薄膜トランジスタ素子部を形成した後映像信号配線とドレイン電極を形成する。次にパッシベーション膜を堆積してからドレイン電極の部分にコンタクトホールを形成して透明導電膜を堆積する。透明導電膜は、図７にあるようにスリットがいくつか形成されて各画素ごとに完全に分離され透明画素電極となる。本発明の電極構造の特徴は図２にあるように、カラーフィルター側のベタ共通電極に対向して細長いスリットまたは円形または多角形のホールが形成されている部分と、図３にあるようにカラーフィルター側のベタ共通電極に対向して細長いスリットとスリットの下層にスリットとほぼ同じ形状でスリットよりもオーバーサイズで液晶配向方向制御電極が形成されている部分とが１画素内に共存している点にあります。図５，図６にあるようにこの２種類の電極構造により、負の誘電率異方性液晶分子は１画素内で２方向または４方向または多方向に正確に目的とする方向にたおれるように制御されます。図２，図３に等電位線の分布がえがかれています。
【００３３】
図４，図５，図６にあるように実施例１では、映像信号配線の左右両側に近接して液晶配向方向制御電極が配置されている。映像信号配線の信号電圧変化を液晶配向方向制御電極がシールドしてまうため透明画素電極に映像信号配線の影響がつたわらない。従来の図１にしめした垂直配向方式液晶表示装置とくらべて図４の本発明の垂直配向方式液晶表示装置は垂直クロストークの発生が少ない。カラーフィルターのＢＭ（遮光膜）の幅も従来のものよりも狭くできるので開口率の大きな垂直配向方式液晶表示装置を実現できる。
【００３４】
〔実施例２〕図３０，図３１，図３２は、本発明の第２の実施例の断面図である。基本的な考え方は実施例１とほぼ同じ構造を採用している。１画素内に図２と図３に示されているような２種類の電極構造が共存している点に特徴がある。図３０，図３１，図３２にあるように映像信号配線は、画素電極に左右両側からはさまれているだけなので映像信号配線の容量を最少に設計できるため、映像信号配線の抵抗値が高くても信号遅延の問題が発生しにくい。図２４は、実施例２の平面図である。液晶配向方向制御電極は１画中に１行しか存在していない。となりあう画素電極はそれぞれ異なる走査信号配線によって制御される薄膜トランジスタに接続されている。図２４の平面図にあるように液晶配向方向制御電極が走査信号配線に近接する領域が小さいために走査信号配線と液晶配向方向制御電極とを同じ層に同時に形成してもお互いが連結しあい電気的にショートしてしまう欠陥が発生する確率は非常に小さい。スリットは走査信号配線の方向に平行な方向と垂直な方向に形成されており、液晶配向方向制御電極と組みになっているスリットは走査信号配線の方向に対して±４５度の角度の方向にのびている。液晶配向方向制御電極と組みになっているスリットは図２８，図２９にあるようなひし型をつなげたような形状でも良いし、四角形をならべたような形状でも良い。
【００３５】
〔実施例３〕図７は、本発明の第３の実施例の平面図である。実施例１の断面構造図と実施例２の断面構造図の２種類が１画素内部に混在している構造をしている。１画素内に２行の液晶配向方向制御電極が配置されており、それぞれの電位は、対向するカラーフィルター側の共通電極電位を基準として正極電位と負極電位になっている。となりあう透明画素電極はそれぞれ異なる液晶配向方向制御電極によってコントロールされている。図１１と図１２にあるように、透明画素電極に正の極性の信号が書きこまれた時には透明画素電極のスリットの下層に絶縁膜をかいして形成されている液晶配向方向制御電極の電位は透明画素電極よりも高い正の極性電位にあり、透明画素電極に負の極性の信号が書きこまれた時には透明画素電極のスリットの下層に絶縁膜をかいして形成されている液晶配向方向制御電極の電位は、透明画素電極よりも低い負の極性電位にある。透明画素電極と１画素内に配置されている２行の液晶配向方向制御電極は垂直周期ごとにそれぞれの極性をいれかえている。
【００３６】
図７にあるように透明画素電極に形成されているスリットとスリットの下層に配置されている液晶配向方向制御電極は、走査信号配線の方向に対して±４５度の角度で配置されている。１画素の上半分と下半分とではそれぞれスリットとスリットの下層の液晶配向方向制御電極はお互いにほぼ平行にたがいちがいに配置されている。画素の中央部に液晶配向方向制御電極が上半分と下半分を分離するように配置されている点に特徴がある。偏光板は液晶セルの外部に偏光軸が走査信号配線に対して平行と直角方向になるように互いに直交する関係で配置されている。
【００３７】
〔実施例４〕図８，図９，図１０は本発明の第４の実施例の平面図である。実施例１の断面構造図を採用しており、透明画素電極の外周を液晶配向方向制御電極がとりかこんでいる。このために映像信号配線の電位変動の影響を透明画素電極が受けにくいので垂直クロストークが発生しにくい。液晶配向方向制御電極と透明画素電極とがオーバーラップしているためにカラーフィルターの遮光膜（ＢＭ）の範囲をせばめることができるために開口率をあげることができる。１画素内に２行の液晶配向方向制御電極が存在しており駆動方式は実施例３とほぼ同じ方式を用いることができる。図８では画素電極に形成されたスリットが走査信号配線方向に対して±４５度の方向に配置されている。図９では画素電極に形成されたスリットは走査信号配線方向に対して水平と垂直の２方向に配置されている。図１０では画素電極にこまかいスリットのきざみを液晶分子の運動方向にいれている。偏光板の配置は実施例３とまったく同じで良い。
【００３８】
〔実施例５〕図１４は、本発明の第５の実施例の平面図である。実施例１の断面構造図を採用しており、透明画素電極の外周を液晶配向方向制御電極がとりかこんでいる。このため映像信号配線の電位変動の影響を透明画素電極が受けにくいので、垂直クロストークが発生しにくい。実施例４と異なるのは透明画素電極に円形のホールが多数形成されている点である。円形以外でも多角形のホールであれば形状は、なんでも良い。１画素内に２行の液晶配向方向制御電極が存在しており、駆動方式は実施例３と同じ方式を用いる。偏光板の配置は実施例３と同じで良い。
【００３９】
〔実施例６〕図１６は、本発明の第６の実施例の平面図である。実施例１の断面構造図と実施例２の断面構造図の２種類が１画素内部に混在している構造をしている。１画素内に１行の液晶配向方向制御電極が配置されていて、となりあう画素電極はそれぞれ異なる走査信号配線によって制御されている薄膜トランジスタ素子に連結されている。透明画素電極に形成されている細長いスリットとスリットの下層に絶縁膜をかいして形成されている液晶配向方向制御電極の形状は実施例３とほぼ同様で、走査信号配線の方向に対して±４５度の角度で配置されている。１画素の上半分と下半分とではそれぞれスリットとスリットの下層に形成されている液晶配向方向制御電極は、お互いにほぼ平行にたがいちがいに配置されている。画素の中央部に上半分と下半分を分離している液晶制御電極が配置されている。偏光板は液晶セルの外部に偏光軸が走査信号配線に対して平行と直角方向になるように互いに直交する関係に配置されている。
【００４０】
本発明のすべての実施例において透明画素電極と液晶配向方向制御電極とが絶縁膜をかいしてお互いにかさなりあうことで付加容量（保持容量）を形成している。付加容量を大きくしたければお互いのかさなりあう領域を大きくすれば良い。付加容量を小さくしたければ、お互いのかさなりあう領域を小さくすれば良い。通常の範囲ではかさなりあう幅は２ミクロン程度あれば十分な付加容量が形成される。
【００４１】
図２２，図２３に実施例６の駆動方法がしめされている。実施例３の駆動方法とはすこし異なっている。実施例３ではとなりあう画素電極は同一の走査信号配線によってコントロールされており映像信号配線からそれぞれ異なる極性の映像信号が書きこまれる方式を用いている。実施例６ではとなりあう画素電極は異なる走査信号配線によってコントロールされており、映像信号配線から同じ極性の映像信号が、１水平走査期間ずれて書きこまれる方式を用いている。図２２，図２３にあるように、透明画素電極に正の信号が書きこまれた時には、液晶配向方向制御電極の電位は透明画素電極よりも高い正の極性電位にあり、透明画素電極に負の信号が書きこまれた時には、液晶配向方向制御電極の電位は透明画素電極よりも低い負の極性電位にある。透明画素電極と液晶配向方向制御電極は、垂直周期ごとにそれぞれの極性を反転させている。
【００４２】
本発明のすべての実施例において透明画素電極と液晶配向方向制御電極の電位差を大きくすることで、負の誘電率異方性液晶分子を垂直方向から目的とする方向にかたむきさせることが可能である。垂直方向（９０度）からほんの１〜２度傾斜させるだけで十分である。通常４〜５Ｖ以上のバイアス電位が印加される。高速応答させるためには、傾斜角を１０度以上傾斜させる必要がありこの場合６〜８Ｖ以上のバイアス電位を印加する。液晶ＴＶ用として本発明を用いる場合、透明画素電極と液晶配向方向制御電極とのバイアス電位を大きく設定すると良い。コンピューター用表示装置とＴＶ用動画表示装置をかねる時にはこのバイアス電位を変化できるように回路設計すると良い。
【００４３】
〔実施例７〕図１７，図１８は、本発明の第７の実施例の平面図である。実施例１の断面構造図を採用しており、透明画素電極の外周を液晶配向方向制御電極がとりかこんでいる。このために映像信号配線の電位変動の影響を透明画素電極が受けにくいので垂直クロストークが発生しにくい。１画素中に１行の液晶配向方向制御電極が存在しており、となりあう透明画素電極は、それぞれ異なる走査信号配線によって制御されている薄膜トランジスタ素子に連結されている。駆動方法は実施例６と同じである。偏光板の配置も実施例６と同じである。
【００４４】
〔実施例８〕図２５は、本発明の第８の実施例の平面図である。実施例１の断面構造図を採用しており、透明画素電極の外周を液晶配向方向制御電極がとりかこんでいる。このために映像信号配線の電位変動の影響を透明画素電極が受けにくいので垂直クロストークが発生しにくい。１画素中に１行の液晶配向方向制御電極が存在しており、となりあう透明画素電極は、それぞれ異なる走査信号配線によって制御されている薄膜トランジスタ素子に連結されている。駆動方法は実施例６と同じである。透明画素電極に円形のホールが多数形成されている。円形以外でも多角形のホールであればどんな形状でも良い。負の誘電率異方性液晶に左回りまたは右回りのどちらかのカイラル材をブレンドすることにより施光性液晶表示モードを実現できる。この場合液晶セルギャップｄと屈折率異方性Δｎの積の値が０．３０〜０．６０ミクロンメートルの範囲にあれば良い。負の誘電率異方性液晶分子は、円形のホールを中心として左旋回または右旋回しながらうず巻き状に配向してたおれこむことでバックライトの光を、直交配置された偏光板から通過させることができる。
【００４５】
〔実施例９〕図２０は、本発明の第９の実施例のアクティブマトリックス基板の平面図である。走査信号配線と液晶配向方向制御電極の両方の接続端子部が表示画面の左側にあつめられている。図１９は接続端子部の拡大平面図である。１画素に２行の液晶配向方向制御電極が存在する場合の接続端子部の拡大平面図が図１３である。１本の走査信号配線は異なる行の液晶配向方向制御電極により上下両側からはさみこまれている。上下の液晶配向方向制御電極の極性切り換えのタイミングを図３３にあるように同時におこなうことで走査信号配線の電位変動を最小にくいとめることが可能となり、表示画面に垂平方向の周期的ムラが発生しにくくなる。図１３にあるように走査信号配線の端子と液晶配向方向制御電極の端子の距離をあけることで、接続端子間のショートを防止できる。
【００４６】
〔実施例１０〕図１５，図２１は、本発明の第１０の実施例のアクティブマトリックス基板の平面図である。走査信号配線の接続端子部と液晶配向方向制御電極の接続端子部とがそれぞれ別々に表示画面の左側と右側に分離されている。駆動方法は図１１，図１２にあるような方法でも良いし、図３３にあるような方法でも良い。本発明の実施例図１５，図２１を採用することで接続端子間の距離を拡大できるので接続端子間のショートを防止できる。さらに通常のＴＮモードの走査信号配線駆動ＩＣを用いることができるので、開発コスト生産コストを低減することが可能である。
【００４７】
〔実施例１１〕図２６，図２７は、本発明の第１１の実施例のアクティブマトリックス基板の平面図である。走査信号配線と液晶配向方向制御電極のそれぞれの接続端子部が表示画面の左右両端にもうけられている。大型液晶表示装置を駆動する時に一番大きな問題となる走査信号波形の遅延の問題をたやすく解決することができる。
【００４８】
【発明の効果】
本発明を用いることで従来のマルチドメイン垂直配向方式液晶表示装置に用いられていたバンプまたはスリット付きのカラーフィルター基板を用いる必要がなくなりコストを低減することが可能である。バンプやスリットの加工にともなうバラツキが原因の表示ムラが発生しなくなるので歩留りが非常に高くなる。バンプやスリットのすきまからの汚染物の拡散の問題もなくなり非常に信頼性の高い垂直配向方式液晶表示装置を実現できる。ポリイミド配向膜塗布工程で不良が発生しても簡単に酸素プラズマ処理によりリワーク可能となるのでリワークコストを低減できる。
【００４９】
本発明の電極構造と駆動方法を用いることで液晶分子の応答速度を向上することができるので動画対応の超大型液晶ＴＶを実現できる。
【図面の簡単な説明】
【図１】従来のマルチドメイン垂直配向方式液晶パネルの断面構造図
【図２】平面電極とスリット電極が形成する電界による、垂直配向された負の誘電率異方性液晶分子の運動方向
【図３】平面電極とスリット電極と配向制御電極が形成する電界による、垂直配向された負の誘電率異方性液晶分子の運動方向
【図４】本発明のマルチドメイン垂直配向方式液晶パネルの断面構造図
【図５】本発明のマルチドメイン垂直配向方式液晶パネルの駆動原理断面構造図（画素電極負のデータの場合）
【図６】本発明のマルチドメイン垂直配向方式液晶パネルの駆動原理断面構造図（画素電極正のデータの場合）
【図７】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図８】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図９】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図１０】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図１１】本発明のマルチドメイン垂直配向方式液晶パネルの奇数列ｎ行目と（ｎ＋１）行目の薄膜トランジスタに印加される電圧波形図
【図１２】本発明のマルチドメイン垂直配向方式液晶パネルの偶数列ｎ行目と（ｎ＋１）行目の薄膜トランジスタに印加される電圧波形図
【図１３】本発明のマルチドメイン垂直配向方式液晶パネルの走査線と液晶配向制御電極の接続端子部の平面図
【図１４】本発明の垂直配向方式液晶パネルの平面構造図
【図１５】本発明の垂直配向方式アクティブマトリックス基板の平面図
【図１６】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図１７】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図１８】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図１９】本発明のマルチドメイン垂直配向方式液晶パネルの走査線と液晶配向制御電極の接続端子部の平面図
【図２０】本発明の垂直配向方式アクティブマトリックス基板の平面図
【図２１】本発明の垂直配向方式アクティブマトリックス基板の平面図
【図２２】本発明のマルチドメイン垂直配向方式液晶パネルの奇数列ｎ行目と（ｎ＋１）行目の画素に対応するトランジスタに印加される電圧波形
【図２３】本発明のマルチドメイン垂直配向方式液晶パネルの偶数列ｎ行目と（ｎ＋１）行目の画素に対応するトランジスタに印加される電圧波形
【図２４】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図２５】本発明のマルチドメイン垂直配向方式液晶パネルの平面構造図
【図２６】本発明の垂直配向方式アクティブマトリックス基板の平面図
【図２７】本発明の垂直配向方式アクティブマトリックス基板の平面図
【図２８】本発明の液晶配向制御電極と透明画素電極に形成されたスリットの平面図と断面構造図
【図２９】本発明の液晶配向制御電極と透明画素電極に形成されたスリットの平面図と断面構造図
【図３０】本発明のマルチドメイン垂直配向方式液晶パネルの断面構造図
【図３１】本発明のマルチドメイン垂直配向方式液晶パネルの駆動原理断面構造図（画素電極負のデータの場合）
【図３２】本発明のマルチドメイン垂直配向方式液晶パネルの駆動原理断面構造図（画素電極正のデータの場合）
【図３３】本発明のマルチドメイン垂直配向方式液晶パネルの奇数列ｎ行目と（ｎ＋１）行目の薄膜トランジスクに印加される電圧波形図
【符合の説明】
１‥‥カラーフィルター側ガラス基板
２‥‥ブラックマスク（遮光膜）
３‥‥カラーフィルター層
４‥‥カラーフィルター側透明導電膜（透明共通電極）
５‥‥垂直配向液晶分子の方向制御用バンプ
６‥‥カラーフィルター側垂直配向膜
７‥‥アクティブマトリックス基板側垂直配向膜
８‥‥透明画素電極
９‥‥画素電極側に形成されたスリット開口部
１０‥‥パッシベーション膜
１１‥‥映像信号配線
１２‥‥ゲート絶縁膜
１３‥‥アクティブマトリックス素子側ガラス基板
１４‥‥負の誘電率異方性液晶
１５‥‥液晶配向制御電極
１６‥‥薄膜トランジスタ素子
１７‥‥走査線
１８‥‥コンタクトホール
１９‥‥上部液晶配向制御電極
２０‥‥下部液晶配向制御電極
２１‥‥透明共通電極電位
２２‥‥奇数列映像信号配線波形
２３‥‥ｎ行走査線信号波形
２４‥‥（ｎ＋１）行走査線信号波形
２５‥‥ｎ行上部液晶配向制御電極信号波形
２６‥‥ｎ行下部液晶配向制御電極信号波形
２７‥‥（ｎ＋１）行上部液晶配向制御電極信号波形
２８‥‥（ｎ＋１）行下部液晶配向制御電極信号波形
２９‥‥偶数列映像信号配線波形
３０‥‥（ｎ−１）行走査線接続端子
３１‥‥ｎ行上部液晶配向制御電極接続端子
３２‥‥ｎ行下部液晶配向制御電極接続端子
３３‥‥ｎ行走査線接続端子
３４‥‥（ｎ＋１）行上部液晶配向制御電極接続端子
３５‥‥（ｎ＋１）行下部液晶配向制御電極接続端子
３６‥‥（ｎ＋１）行走査線接続端子
３７‥‥画素電極側に形成されたホール開口部
３８‥‥（ｎ−１）行液晶配向制御電極接続端子
３９‥‥ｎ行液晶配向制御電極接続端子
４０‥‥映像信号配線端子部
４１‥‥画素周辺共通電極端子部
４２‥‥静電気対策用保護回路
４３‥‥（ｎ−１）行走査線信号波形
４４‥‥ｎ行液晶配向制御電極信号波形
４５‥‥（ｎ＋１）行液晶配向制御電極信号波形[0001]
[Industrial application fields]
The present invention relates to a large-screen active matrix liquid crystal TV display device having a wide viewing angle, high brightness, and high-speed response at low cost.
[0002]
[Prior art]
As shown in FIG. 1, in the conventional vertical alignment type liquid crystal display device, bumps for controlling the movement direction of liquid crystal molecules are formed on the transparent common electrode of the color filter side substrate, and the transparent pixel electrode of the active matrix substrate is formed. A method is adopted in which a slit for controlling the movement direction of the liquid crystal molecules is provided, and the bump and slit form a set to determine the movement direction of the liquid crystal molecules. There is also a method in which slits for controlling the direction of movement of liquid crystal molecules are formed in the transparent common electrode on the color filter side substrate instead of bumps. Both of these methods are mass-produced and put into practical use.
[0003]
[Problems to be solved by the invention]
In the conventional multi-domain vertical alignment type liquid crystal display device, bumps or slits must be formed on the transparent common electrode on the color filter substrate, and the photomask process has to be performed once. Therefore, it was not possible to avoid an increase in cost.
[0004]
Furthermore, in the vertical alignment type liquid crystal display device in which the bumps are formed on the color filter side as shown in FIG. 1, there is a variation in how the liquid crystal molecules are arranged unless the bump width, height and angle of the inclined surface are precisely controlled. This occurs and unevenness occurs in the halftone area. Since the material of the bump is a positive type photoresist, it is necessary to completely remove the organic solvent, and it must be baked at a high temperature of 200 ° C. or more, which makes it difficult to shorten the process. When contaminants elute into the liquid crystal from the positive photoresist bumps, an afterimage phenomenon occurs, which is also a problem in terms of reliability.
[0005]
In conventional color filter substrates using bumps, positive photoresist is used as the bump material, so if a defect occurs in the vertical alignment film coating process, use a dry ashing method using oxygen plasma when reworking. I can't. For this reason, a wet removal method with a high running cost must be used, and the rework cost is very high.
[0006]
The conventional vertical alignment type liquid crystal display device using bumps and slits has a drawback that the response speed of the liquid crystal is slow when shifting from black display to halftone display or from white display to halftone display.
[0007]
The present invention solves the above-mentioned problems, and its object is to improve the reliability of a large-sized vertical alignment type liquid crystal display device, which can be manufactured inexpensively in a short time, and is bright and has a response speed. It is to realize a fast liquid crystal display.
[0008]
[Means for Solving the Problems]
In order to solve the above problems and achieve the above object, the present invention uses the following means.
[0009]
[Means 1] In order to apply a voltage to the negative dielectric anisotropy liquid crystal molecules vertically aligned on the active matrix substrate and the color filter substrate, the liquid crystal molecules are tilted in two different directions or four directions as described below. Various types of electrode structures were formed in one pixel of the active matrix substrate.
i) A transparent solid common electrode is used on the color filter substrate side, and an elongated slit-like pattern (there is no transparent electrode in the slit portion) is formed on the transparent pixel electrode on the active matrix substrate side facing this.
ii) A transparent solid common electrode is used on the color filter substrate side, and an elongated slit-like pattern is formed on the transparent pixel electrode on the active matrix substrate side opposite thereto, and an insulating layer is formed on the lower layer of the transparent pixel electrode. There are two rows of liquid crystal alignment direction control electrodes that are separated from each other and are set to different potentials, and one of the liquid crystal alignment direction control electrodes is formed into the elongated slit-like pattern. The liquid crystal alignment direction control electrodes, which are almost the same shape as the above, are larger than the slits, and are separated from each other in two rows, are transparent with each other in the scanning signal wiring direction at regular pixel cycles. It is disposed below the elongated slit formed in the pixel electrode.
[0010]
[Means 2] The following driving method is used as a driving method of the vertical alignment type liquid crystal display device having the electrode structure of means 1. Liquid crystal alignment placed below the slit of the transparent pixel electrode when the potential of the transparent pixel electrode separated for each pixel on the active matrix substrate side is lower than the potential of the solid common electrode on the opposite side of the color filter substrate When the potential of the direction control electrode is set lower than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode is higher than the potential of the solid common electrode on the opposite color filter substrate side, the slit of the transparent pixel electrode The potential of the liquid crystal alignment direction control electrode installed in the lower layer is set higher than the potential of the transparent pixel electrode, and the potential of the liquid crystal alignment direction control electrode arranged close to both sides of the scanning signal wiring is Each of the liquid crystal alignment direction control electrodes of the two rows which are set to different polar potentials and are separated and independent from each other in the potential of the transparent pixel electrode. Position, for each vertical scanning period with respect to the potential of the common electrode of the color filter substrate side, using a driving method of inverting the polarity.
[0011]
[Means 3] Regarding a color active matrix type vertical alignment type liquid crystal display device in which transparent pixel electrodes adjacent in the direction of the scanning signal wiring are connected to thin film transistors controlled by different scanning signal wirings, an active matrix substrate and a color filter substrate The following two types of electrode structures were formed in one pixel of the active matrix substrate in order to apply a voltage to liquid crystal molecules vertically aligned between them and cause the liquid crystal molecules to fall in two different directions or four different directions.
i) A transparent solid common electrode is used on the color filter substrate side, and an elongated slit-like pattern (there is no transparent electrode in the slit portion) is formed on the transparent pixel electrode on the active matrix substrate side facing this. .
ii) A transparent solid common electrode is used on the color filter substrate side, an elongated slit-like pattern is formed on the transparent pixel electrode on the opposite side of the active matrix substrate, and an insulating film is placed under the slit. Then, a liquid crystal alignment direction control electrode is formed which has substantially the same shape as the slit and is larger in size than the slit.
[0012]
[Means 4] As a driving method of the vertical alignment type liquid crystal display device having the electrode structure of means 3, the following driving method is used. Liquid crystal alignment direction control installed under the slit of the transparent pixel electrode when the potential of the transparent pixel electrode separated for each pixel on the active matrix substrate side is lower than the potential of the solid common electrode on the opposite color filter substrate side When the potential of the electrode is set lower than the potential of the transparent pixel electrode and the potential of the transparent pixel electrode is higher than the potential of the solid common electrode on the opposite color filter substrate side, it is installed below the slit of the transparent pixel electrode. The potential of the liquid crystal alignment direction control electrode is set higher than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode and the potential of the liquid crystal alignment direction control electrode are the same as the potential of the common electrode on the color filter substrate side. On the other hand, a driving method for inverting the polarity is used for each vertical scanning period.
[0013]
[Means 5] In order to apply a voltage to the negative dielectric anisotropy liquid crystal molecules vertically aligned on the active matrix substrate and the color filter substrate to cause the liquid crystal molecules to be tilted in multiple directions, the following two types of electrode structures are activated. It was formed in one pixel of the matrix substrate.
i) A transparent solid electrode is used on the side of the color filter substrate, and a transparent pixel electrode on the side of the active matrix substrate opposite to this has many circular or polygonal holes (there is no transparent electrode in the hole portion). Form.
ii) A transparent solid electrode is used on the color filter substrate side, and an elongated slit-like pattern is formed on the transparent pixel electrode on the side of the active matrix substrate facing the transparent electrode, and an elongated slit-like pattern is formed on the transparent pixel electrode. In the lower layer of the transparent pixel electrode, there are two rows of liquid crystal alignment direction control electrodes that are separated from each other and are set to different potentials. One of the liquid crystal alignment direction control electrodes is substantially the same as the elongated slit-like pattern shape and is larger in size than the slits, and two rows of liquid crystal alignment direction control electrodes that are separated and independent from each other are provided as scanning signals. In the wiring direction, they are arranged under a long and narrow slit formed in the transparent pixel electrode so as to be replaced with each other at every predetermined pixel period.
[0014]
[Means 6] As a driving method of the vertical alignment type liquid crystal display device having the electrode structure of means 5, the following driving method is used. Liquid crystal alignment direction installed below the slit of the transparent pixel electrode when the potential of the transparent pixel electrode separated for each pixel on the active matrix substrate side is lower than the potential of the solid common electrode on the opposite color filter substrate side When the potential of the control electrode is set lower than the potential of the transparent pixel electrode and the potential of the transparent pixel electrode is higher than the potential of the solid common electrode on the opposite color filter substrate side, The potential of the installed liquid crystal alignment direction control electrodes is set higher than the potential of the transparent pixel electrode, and the potentials of the liquid crystal alignment direction control electrodes arranged close to both sides of the scanning signal wiring are mutually Different polar potentials are set, and the potentials of the transparent pixel electrode and the liquid crystal alignment direction control electrodes of the two rows separated and independent in one pixel are set. , For each vertical scanning period with respect to the potential of the common electrode of the color filter substrate side, using a driving method of inverting the polarity.
[0015]
[Means 7] An active matrix substrate and a color filter substrate for an active matrix vertical alignment type liquid crystal display device in which transparent pixel electrodes adjacent in the direction of the scanning signal wiring are connected to thin film transistors controlled by different scanning signal wirings The following two types of electrode structures were formed in one pixel of the active matrix substrate in order to apply a voltage to the vertically aligned liquid crystal molecules and cause the liquid crystal molecules to be tilted in multiple directions.
i) A transparent solid electrode is used on the side of the color filter substrate, and the transparent pixel electrode on the side of the active matrix substrate opposite to this has many circular or polygonal holes (there is no transparent electrode at the hole). Form.
ii) A transparent solid electrode is used on the side of the color filter substrate, and an elongated slit-like pattern is formed on the transparent pixel electrode on the side of the active matrix substrate facing this, and an insulating film is placed under this slit. Then, a liquid crystal alignment direction control electrode is formed which is substantially the same shape as the slit and is larger in size than the slit.
[0016]
[Means 8] As a driving method of the vertical alignment type liquid crystal display device having the electrode structure of means 7, the following driving method is used. Liquid crystal alignment direction installed below the slit of the transparent pixel electrode when the potential of the transparent pixel electrode separated for each pixel on the active matrix substrate side is lower than the potential of the solid common electrode on the opposite color filter substrate side When the potential of the control electrode is set lower than the potential of the transparent pixel electrode and the potential of the transparent pixel electrode is higher than the potential of the solid common electrode on the opposite color filter substrate side, The potential of the installed liquid crystal alignment direction control electrode is set higher than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode and the potential of the liquid crystal alignment direction control electrode are the same as those of the common electrode on the color filter substrate side. A driving method in which the polarity is inverted with respect to the potential every vertical scanning period is used.
[0017]
[Means 9] In the means 1 and 3, the elongated slit formed in the transparent pixel electrode on the active matrix substrate side and the slit combined with the liquid crystal alignment direction control electrode are substantially in the scanning signal wiring direction. Alternatingly arranged in the direction of an angle of ± 45 degrees with a substantially parallel relationship, the polarization axes of the two polarizing plates installed outside the liquid crystal cell are the scanning signal wiring direction and the video signal wiring direction. And arranged perpendicular to each other.
[0018]
[Means 10] In the means 1 and 3, the elongated slit formed in the transparent pixel electrode on the active matrix substrate side is arranged in an angle of ± 45 degrees with respect to the direction of the scanning signal wiring, and The slit paired with the liquid crystal alignment direction control electrode is arranged in a direction orthogonal to the direction parallel to the scanning signal wiring direction, and the liquid crystal alignment direction control electrode serves as the pixel electrode and the insulating film. It has a structure that is rather small, and the polarization axes of the two polarizing plates installed outside the liquid crystal cell are aligned in the scanning signal wiring direction and the video signal wiring direction, and are arranged perpendicular to each other. .
[0019]
[Means 11] In the means 1 and 3, the elongated slits formed in the transparent pixel electrode on the active matrix substrate side are arranged in a direction parallel to the direction of the scanning signal wiring and in a direction orthogonal thereto, and the liquid crystal alignment The slit that is paired with the direction control electrode is arranged parallel to the scanning signal wiring direction, and the liquid crystal alignment direction control electrode covers the pixel electrode and the insulating film around the outer periphery of the pixel electrode. However, the polarizing axes of the two polarizing plates installed outside the liquid crystal cell are arranged so as to be orthogonal to each other in the scanning signal wiring direction and the video signal wiring direction.
[0020]
[Means 12] In the means 1 and 3, the elongated slits formed in the transparent pixel electrode on the active matrix substrate side are arranged in a direction perpendicular to the direction parallel to the scanning signal wiring direction, and the liquid crystal alignment The slit that is paired with the direction control electrode has a structure in which the slit is arranged at an angle of ± 45 degrees with respect to the scanning signal wiring direction, and the two polarizing plates installed outside the liquid crystal cell The polarization axes are arranged so as to be orthogonal to each other in alignment with the scanning signal wiring direction and the video signal wiring direction.
[0021]
[Means 13] In means 5 and 7, a slit combined with a liquid crystal alignment direction control electrode so as to surround a plurality of circular or polygonal holes formed in the transparent pixel electrode on the active matrix substrate side is a scanning signal. It is arranged in a direction orthogonal to the direction parallel to the wiring direction, and the outer peripheral part of the pixel electrode has a structure in which the liquid crystal alignment direction control electrode sandwiches the pixel electrode and the insulating film while sandwiching, The polarization axes of the two polarizing plates installed outside the liquid crystal cell are aligned with the scanning signal wiring direction and the video signal wiring direction so as to be orthogonal to each other.
[0022]
[Means 14] In the means 1, 3, 5, and 7, the liquid crystal alignment direction control electrode formed by interposing an insulating layer under the slit of the transparent pixel electrode is formed in the same layer at the same time when the scanning signal wiring is formed. It was to so.
[0023]
[Means 15] In the means 1, 3, 5 and 7, an additional capacitor is formed by the liquid crystal alignment direction control electrode formed by sandwiching an insulating layer below the slit of the transparent pixel electrode and the transparent pixel electrode.
[0024]
[Means 16] In the means 1 and 5, the scanning signal wiring and the liquid crystal alignment direction control electrode are all completely separated and independent, and are connected to the output terminals of different driving ICs, respectively, so that two rows of liquid crystals are controlled. The connection terminal portions of the orientation direction control electrodes are arranged so as to be sandwiched between the connection terminal portions of different scanning signal wirings.
[0025]
[Means 17] In the means 3 and 7, the scanning signal wiring and the liquid crystal alignment direction control electrode are all completely separated and independent, and are connected to the output terminals of different drive ICs, respectively, and one row of liquid crystal alignment for controlling one row of pixels. The connection terminal portion of the direction control electrode is disposed so as to be sandwiched between the connection terminal portions of different scanning signal wirings.
[0026]
[Means 18] In the means 1, 3, 5 and 7, the connection terminal portion of the scanning signal wiring is arranged on either the left side or the right side of the display screen portion, and the connection terminal portion of the liquid crystal alignment direction control electrode is Arranged on the other side different from the connection terminal portion of the scanning signal wiring, each connection terminal is completely separated and independent, and is connected to the output terminal of another drive IC.
[0027]
[Means 19] In the means 1 and 5, the scanning signal lines and the liquid crystal alignment direction control electrodes are all completely separated and independent, the respective connection terminals are arranged on the left and right sides of the display screen, and one row of pixels. The connection terminal portions of the two rows of liquid crystal alignment direction control electrodes for controlling the above are arranged so as to be sandwiched between the connection terminal portions of different scanning signal wirings.
[0028]
[Means 20] In the means 3 and 7, the scanning signal wiring and the liquid crystal alignment direction control electrode are all completely separated and independent, the respective connection terminals are arranged on the left and right sides of the display screen, and one row The connection terminal portions of the liquid crystal alignment direction control electrodes in one row for controlling the pixels are arranged so as to be sandwiched between the connection terminal portions of different scanning signal wirings.
[0029]
[Means 21] In the means 2, 4, 6, 8, the bias voltage applied between the liquid crystal alignment direction control electrode formed below the slit of the transparent pixel electrode and the transparent pixel electrode at the time of moving image display, It was larger than that for still image display, and the speed at which the negative dielectric anisotropy liquid crystal molecules sag was increased.
[0030]
[Action]
By using the means 1, 2, 3, 4, 5, 6, 7, and 8, the negative dielectric anisotropy liquid crystal molecules are vertically aligned as shown in FIGS. It is possible to let it stand in the desired direction from the state where it was. As a result, it is no longer necessary to form the movement direction control bumps (5) for the liquid crystal molecules, which had to be formed on the color filter side substrate of the conventional vertical alignment type liquid crystal display device as shown in FIG. As a result, as shown in FIG. 4, a multi-domain vertical alignment type liquid crystal display device can be manufactured using an inexpensive color filter. Further, as can be seen from FIG. 4, since there is only an alignment film and a negative dielectric constant anisotropic liquid crystal between the solid common electrode on the color filter side and the transparent pixel electrode on the active matrix substrate, contamination from the bump (5) is present. Problems such as diffusion of objects are completely eliminated, and reliability is greatly improved.
[0031]
Further, since there is no bump (5), even if the alignment film application fails, it can be easily reproduced in a short time by oxygen plasma by a dry asher. Oxygen and argon plasma treatment using a dry asher can be used for the surface treatment before the alignment film application, so that the occurrence of repelling and pinholes in the alignment film application process can be drastically reduced.
[0032]
By using the means 9, 10, 11, 12, and 13, the effective utilization efficiency of the polarizing plate can be greatly improved, and the cost of the polarizing plate used in the super large liquid crystal display device can be reduced. Furthermore, since the effective utilization efficiency of the reflective polarizer composed of a multilayer laminate of two kinds of materials used in the backlight can be greatly improved, the cost of the backlight for the ultra-large liquid crystal display device can be reduced. Since the movement direction of the liquid crystal molecules can be controlled in four directions, a wide viewing angle can be realized.
[0033]
By using the means 14 and 15, the active matrix substrate of the present invention can be manufactured in exactly the same process without changing the manufacturing process of the conventional active matrix substrate. Further, as shown in FIGS. 7, 8, 9, 10, 14, 16, 16, 17, 18 and 25, liquid crystal alignment direction control electrodes are arranged close to both sides of the video signal wiring. For this reason, the fluctuation in the potential of the video signal wiring is easily shielded. For this reason, the occurrence of vertical crosstalk can be completely suppressed.
[0030]
By using the means 16, 17, 18, 19, and 20, the liquid crystal alignment direction control electrodes formed in the lower layer of the slits of the pixel electrodes in each row can be driven separately for each row, and the upper and middle portions of the display screen The lower part can be displayed uniformly under the same conditions.
[0031]
By using the means 2, 4, 6, 8, and 21, it becomes possible to cause the negative dielectric anisotropy liquid crystal molecules to be tilted in the target direction from the vertically aligned state, thereby preventing the occurrence of disclination. Uniform halftone display is possible. Furthermore, the slow response speed from black display to halftone display and white display to halftone display, which has been a problem in the conventional vertical alignment liquid crystal display mode, can be greatly improved by using the present invention. When dealing with moving images, the response speed can be further improved by increasing the bias voltage applied between the transparent pixel electrode and the liquid crystal alignment direction control electrode formed below the slit of the transparent pixel electrode. . In the present invention, the closer to black display, the larger the bias voltage becomes, so that the response speed can be improved in the entire region.
[0032]
【Example】
[Embodiment 1] FIGS. 4, 5, and 6 are cross-sectional views of a first embodiment of the present invention. The color filter substrate has a solid transparent common electrode, and an active matrix substrate is arranged in parallel to face the substrate. In the active matrix substrate, first, the scanning signal wiring and the liquid crystal alignment direction control electrode are simultaneously formed in the same layer, and then the gate insulating film, the amorphous silicon layer, and the ohmic contact n are formed. ⁺ Deposit an amorphous silicon layer. After the thin film transistor element is formed, the video signal wiring and the drain electrode are formed. Next, after depositing a passivation film, a contact hole is formed in the drain electrode portion to deposit a transparent conductive film. The transparent conductive film is formed with several slits as shown in FIG. 7 and is completely separated for each pixel to become a transparent pixel electrode. As shown in FIG. 2, the electrode structure of the present invention is characterized in that a long slit or a circular or polygonal hole is formed facing the solid common electrode on the color filter side, and a color as shown in FIG. Opposite the solid common electrode on the filter side, a long and narrow slit and a portion where the liquid crystal alignment direction control electrode is formed in the lower layer of the slit and having the same shape as the slit and larger in size than the slit coexist in one pixel. In the point. As shown in FIGS. 5 and 6, with these two types of electrode structures, the negative dielectric anisotropy liquid crystal molecules can be accurately placed in the desired direction in two directions, four directions or multiple directions within one pixel. Is controlled. 2 and 3 show the distribution of equipotential lines.
[0033]
As shown in FIGS. 4, 5, and 6, in the first embodiment, liquid crystal alignment direction control electrodes are arranged close to the left and right sides of the video signal wiring. Since the liquid crystal alignment direction control electrode shields the signal voltage change of the video signal wiring, the influence of the video signal wiring does not affect the transparent pixel electrode. Compared with the conventional vertical alignment type liquid crystal display device shown in FIG. 1, the vertical alignment type liquid crystal display device of the present invention shown in FIG. 4 generates less vertical crosstalk. Since the width of the BM (light-shielding film) of the color filter can be made narrower than the conventional one, a vertical alignment type liquid crystal display device having a large aperture ratio can be realized.
[0034]
[Embodiment 2] FIGS. 30, 31, and 32 are cross-sectional views of a second embodiment of the present invention. The basic concept adopts almost the same structure as in the first embodiment. One feature is that two types of electrode structures as shown in FIGS. 2 and 3 coexist in one pixel. As shown in FIGS. 30, 31, and 32, since the video signal wiring is only sandwiched between the left and right sides of the pixel electrode, the capacity of the video signal wiring can be designed to a minimum, so that the resistance value of the video signal wiring is high. However, the problem of signal delay hardly occurs. FIG. 24 is a plan view of the second embodiment. Only one row of liquid crystal alignment direction control electrodes is present in one screen. The adjacent pixel electrodes are connected to thin film transistors controlled by different scanning signal wirings. As shown in the plan view of FIG. 24, since the region where the liquid crystal alignment direction control electrode is close to the scanning signal wiring is small, even if the scanning signal wiring and the liquid crystal alignment direction control electrode are formed in the same layer at the same time, they are connected and electrically connected. The probability of occurrence of a short-circuit defect is very small. The slits are formed in a direction perpendicular to the direction of the scanning signal wiring, and the slits combined with the liquid crystal alignment direction control electrode are in the direction of an angle of ± 45 degrees with respect to the direction of the scanning signal wiring. It is extended. The slit combined with the liquid crystal alignment direction control electrode may have a shape in which rhombuses are connected as shown in FIGS. 28 and 29, or a shape in which squares are arranged.
[0035]
[Embodiment 3] FIG. 7 is a plan view of a third embodiment of the present invention. The cross-sectional structure diagram of the first embodiment and the cross-sectional structure diagram of the second embodiment are mixed in one pixel. Two rows of liquid crystal alignment direction control electrodes are arranged in one pixel, and each potential is a positive potential and a negative potential with reference to the common electrode potential on the opposite color filter side. The adjacent transparent pixel electrodes are controlled by different liquid crystal alignment direction control electrodes. As shown in FIGS. 11 and 12, when a positive polarity signal is written in the transparent pixel electrode, the potential of the liquid crystal alignment direction control electrode formed by interposing an insulating film under the slit of the transparent pixel electrode. Is a positive polarity potential higher than that of the transparent pixel electrode, and when a negative polarity signal is written to the transparent pixel electrode, the liquid crystal alignment direction is formed by interposing an insulating film under the slit of the transparent pixel electrode The potential of the control electrode is at a negative polarity potential lower than that of the transparent pixel electrode. The transparent pixel electrode and the two rows of liquid crystal alignment direction control electrodes arranged in one pixel have their polarities changed every vertical period.
[0036]
As shown in FIG. 7, the slits formed in the transparent pixel electrode and the liquid crystal alignment direction control electrode arranged in the lower layer of the slit are arranged at an angle of ± 45 degrees with respect to the direction of the scanning signal wiring. In the upper half and the lower half of one pixel, the liquid crystal alignment direction control electrodes in the lower half of the slit and the lower half of the slit are arranged in parallel with each other, almost parallel to each other. A feature is that a liquid crystal alignment direction control electrode is arranged in the center of the pixel so as to separate the upper half and the lower half. The polarizing plates are arranged outside the liquid crystal cell so as to be orthogonal to each other so that the polarization axes are parallel and perpendicular to the scanning signal wiring.
[0037]
[Embodiment 4] FIGS. 8, 9 and 10 are plan views of a fourth embodiment of the present invention. The cross-sectional structure diagram of the first embodiment is adopted, and the liquid crystal alignment direction control electrode surrounds the outer periphery of the transparent pixel electrode. For this reason, since the transparent pixel electrode is not easily affected by the potential fluctuation of the video signal wiring, it is difficult for vertical crosstalk to occur. Since the liquid crystal alignment direction control electrode and the transparent pixel electrode overlap each other, the range of the light shielding film (BM) of the color filter can be narrowed, so that the aperture ratio can be increased. There are two rows of liquid crystal alignment direction control electrodes in one pixel, and the driving method can be almost the same as in the third embodiment. In FIG. 8, the slits formed in the pixel electrode are arranged in a direction of ± 45 degrees with respect to the scanning signal wiring direction. In FIG. 9, the slits formed in the pixel electrode are arranged in two directions, horizontal and vertical with respect to the scanning signal wiring direction. In FIG. 10, a small slit is formed in the pixel electrode in the direction of movement of the liquid crystal molecules. The arrangement of the polarizing plates may be exactly the same as in Example 3.
[0038]
[Embodiment 5] FIG. 14 is a plan view of a fifth embodiment of the present invention. The cross-sectional structure diagram of the first embodiment is adopted, and the liquid crystal alignment direction control electrode surrounds the outer periphery of the transparent pixel electrode. For this reason, since the transparent pixel electrode is not easily affected by the potential fluctuation of the video signal wiring, it is difficult for vertical crosstalk to occur. The difference from the fourth embodiment is that a large number of circular holes are formed in the transparent pixel electrode. Any shape can be used as long as it is a polygonal hole. There are two rows of liquid crystal alignment direction control electrodes in one pixel, and the driving method is the same as in the third embodiment. The arrangement of the polarizing plates may be the same as in Example 3.
[0039]
[Embodiment 6] FIG. 16 is a plan view of a sixth embodiment of the present invention. The cross-sectional structure diagram of the first embodiment and the cross-sectional structure diagram of the second embodiment are mixed in one pixel. One row of liquid crystal alignment direction control electrodes is arranged in one pixel, and adjacent pixel electrodes are connected to thin film transistor elements controlled by different scanning signal lines. The shape of the elongated slit formed in the transparent pixel electrode and the liquid crystal alignment direction control electrode formed by covering the lower layer of the slit with the insulating film is substantially the same as in the third embodiment, and ±± with respect to the direction of the scanning signal wiring It is arranged at an angle of 45 degrees. In the upper half and the lower half of one pixel, the liquid crystal alignment direction control electrodes formed in the slit and the lower layer of the slit are arranged in parallel with each other in a substantially parallel manner. A liquid crystal control electrode that separates the upper half and the lower half is disposed at the center of the pixel. The polarizing plates are arranged outside the liquid crystal cell so as to be orthogonal to each other so that the polarization axes are parallel and perpendicular to the scanning signal wiring.
[0040]
In all of the embodiments of the present invention, the transparent pixel electrode and the liquid crystal alignment direction control electrode are in contact with each other through an insulating film to form an additional capacitor (retention capacitor). In order to increase the additional capacity, it is sufficient to increase the area where each other meets each other. In order to reduce the additional capacity, it is only necessary to reduce the area where each other meets each other. In the normal range, a sufficient additional capacity is formed if the width is about 2 microns.
[0041]
22 and 23 show the driving method of the sixth embodiment. This is slightly different from the driving method of the third embodiment. In the third embodiment, pixel electrodes that are adjacent to each other are controlled by the same scanning signal wiring, and video signals having different polarities are written from the video signal wiring. In the sixth embodiment, neighboring pixel electrodes are controlled by different scanning signal wirings, and a video signal having the same polarity is written from the video signal wirings with a shift of one horizontal scanning period. As shown in FIGS. 22 and 23, when a positive signal is written to the transparent pixel electrode, the potential of the liquid crystal alignment direction control electrode is at a positive polarity potential higher than that of the transparent pixel electrode and is negative to the transparent pixel electrode. When the above signal is written, the potential of the liquid crystal alignment direction control electrode is at a negative polarity potential lower than that of the transparent pixel electrode. The polarity of the transparent pixel electrode and the liquid crystal alignment direction control electrode is inverted every vertical period.
[0042]
In all the embodiments of the present invention, by increasing the potential difference between the transparent pixel electrode and the liquid crystal alignment direction control electrode, the negative dielectric constant anisotropic liquid crystal molecules can be bent from the vertical direction to the target direction. . It is sufficient to tilt just 1-2 degrees from the vertical direction (90 degrees). Usually, a bias potential of 4 to 5 V or more is applied. In order to make a high-speed response, it is necessary to incline the inclination angle by 10 degrees or more. In this case, a bias potential of 6 to 8 V or more is applied. When the present invention is used for a liquid crystal TV, it is preferable to set a large bias potential between the transparent pixel electrode and the liquid crystal alignment direction control electrode. It is preferable to design a circuit so that the bias potential can be changed when the computer display device and the TV moving image display device are used.
[0043]
[Embodiment 7] FIGS. 17 and 18 are plan views of a seventh embodiment of the present invention. The cross-sectional structure diagram of the first embodiment is adopted, and the liquid crystal alignment direction control electrode surrounds the outer periphery of the transparent pixel electrode. For this reason, since the transparent pixel electrode is not easily affected by the potential fluctuation of the video signal wiring, it is difficult for vertical crosstalk to occur. One row of liquid crystal alignment direction control electrodes exists in one pixel, and the adjacent transparent pixel electrodes are connected to thin film transistor elements controlled by different scanning signal wirings. The driving method is the same as in the sixth embodiment. The arrangement of the polarizing plates is the same as in Example 6.
[0044]
[Embodiment 8] FIG. 25 is a plan view of an eighth embodiment of the present invention. The cross-sectional structure diagram of the first embodiment is adopted, and the liquid crystal alignment direction control electrode surrounds the outer periphery of the transparent pixel electrode. For this reason, since the transparent pixel electrode is not easily affected by the potential fluctuation of the video signal wiring, it is difficult for vertical crosstalk to occur. There is one row of liquid crystal alignment direction control electrodes in one pixel, and the adjacent transparent pixel electrodes are connected to thin film transistor elements controlled by different scanning signal lines. The driving method is the same as in the sixth embodiment. Many circular holes are formed in the transparent pixel electrode. Any shape other than a circle may be used as long as it is a polygonal hole. A light-transmitting liquid crystal display mode can be realized by blending a negative dielectric anisotropy liquid crystal with either a counterclockwise or clockwise chiral material. In this case, the product value of the liquid crystal cell gap d and the refractive index anisotropy Δn may be in the range of 0.30 to 0.60 micrometer. Negative dielectric anisotropy liquid crystal molecules allow backlight light to pass through orthogonally arranged polarizing plates by concentrating in a spiral shape while turning left or right around a circular hole. Can do.
[0045]
[Embodiment 9] FIG. 20 is a plan view of an active matrix substrate according to a ninth embodiment of the present invention. Connection terminal portions of both the scanning signal wiring and the liquid crystal alignment direction control electrode are arranged on the left side of the display screen. FIG. 19 is an enlarged plan view of the connection terminal portion. FIG. 13 is an enlarged plan view of the connection terminal portion when there are two rows of liquid crystal alignment direction control electrodes in one pixel. One scanning signal wiring is sandwiched between upper and lower sides by liquid crystal alignment direction control electrodes in different rows. By simultaneously performing the polarity switching timings of the upper and lower liquid crystal alignment direction control electrodes as shown in FIG. 33, it becomes possible to minimize the potential fluctuation of the scanning signal wiring, and periodic unevenness in the vertical direction occurs on the display screen. It becomes difficult to do. As shown in FIG. 13, a short circuit between the connection terminals can be prevented by increasing the distance between the terminal of the scanning signal wiring and the terminal of the liquid crystal alignment direction control electrode.
[0046]
[Embodiment 10] FIGS. 15 and 21 are plan views of an active matrix substrate according to a tenth embodiment of the present invention. The connection terminal portion of the scanning signal wiring and the connection terminal portion of the liquid crystal alignment direction control electrode are separately separated on the left and right sides of the display screen. The driving method shown in FIGS. 11 and 12 or the method shown in FIG. 33 may be used. Embodiments of the Present Invention By adopting FIGS. 15 and 21, the distance between the connection terminals can be increased, so that a short circuit between the connection terminals can be prevented. Furthermore, since a normal TN mode scanning signal wiring drive IC can be used, development costs and production costs can be reduced.
[0047]
[Embodiment 11] FIGS. 26 and 27 are plan views of an active matrix substrate according to an eleventh embodiment of the present invention. Connection terminal portions of the scanning signal wiring and the liquid crystal alignment direction control electrode are provided at both the left and right ends of the display screen. It is possible to easily solve the problem of delay of the scanning signal waveform, which is the biggest problem when driving a large-sized liquid crystal display device.
[0048]
【The invention's effect】
By using the present invention, it is not necessary to use a color filter substrate with bumps or slits, which has been used in a conventional multi-domain vertical alignment type liquid crystal display device, and the cost can be reduced. Since the display unevenness due to the variation due to the processing of the bumps and slits does not occur, the yield becomes very high. The problem of diffusion of contaminants from the gaps between the bumps and slits is eliminated, and a highly reliable vertical alignment type liquid crystal display device can be realized. Even if a defect occurs in the polyimide alignment film coating process, it can be easily reworked by oxygen plasma treatment, so that the rework cost can be reduced.
[0049]
Since the response speed of the liquid crystal molecules can be improved by using the electrode structure and the driving method of the present invention, an ultra-large liquid crystal TV compatible with moving images can be realized.
[Brief description of the drawings]
FIG. 1 is a sectional view of a conventional multi-domain vertical alignment type liquid crystal panel.
FIG. 2 shows the direction of motion of vertically aligned negative dielectric anisotropy liquid crystal molecules by an electric field formed by a plane electrode and a slit electrode.
FIG. 3 shows the direction of movement of vertically aligned negative dielectric anisotropy liquid crystal molecules by an electric field formed by a plane electrode, a slit electrode, and an alignment control electrode.
FIG. 4 is a sectional structural view of a multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 5 is a cross-sectional view of the driving principle of the multi-domain vertical alignment type liquid crystal panel of the present invention (in the case of pixel electrode negative data).
FIG. 6 is a cross-sectional view of the driving principle of the multi-domain vertical alignment type liquid crystal panel of the present invention (in the case of pixel electrode positive data).
FIG. 7 is a plan view of the multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 8 is a plan view of a multi-domain vertical alignment type liquid crystal panel according to the present invention.
FIG. 9 is a plan structural view of a multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 10 is a plan view of a multi-domain vertical alignment type liquid crystal panel according to the present invention.
FIG. 11 is a voltage waveform diagram applied to the thin film transistors in the odd-numbered nth and (n + 1) th rows of the multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 12 is a waveform diagram of voltages applied to the thin film transistors in the even-numbered nth and (n + 1) th rows of the multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 13 is a plan view of a connection terminal portion of a scanning line and a liquid crystal alignment control electrode of the multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 14 is a plan structural view of a vertical alignment type liquid crystal panel of the present invention.
FIG. 15 is a plan view of a vertical alignment type active matrix substrate of the present invention.
FIG. 16 is a plan structural view of a multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 17 is a plan view of a multi-domain vertical alignment type liquid crystal panel according to the present invention.
FIG. 18 is a plan structural view of a multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 19 is a plan view of connection terminals of scanning lines and liquid crystal alignment control electrodes of a multi-domain vertical alignment type liquid crystal panel according to the present invention.
FIG. 20 is a plan view of a vertical alignment type active matrix substrate of the present invention.
FIG. 21 is a plan view of a vertical alignment type active matrix substrate of the present invention.
FIG. 22 shows voltage waveforms applied to transistors corresponding to pixels in odd-numbered columns n-th row and (n + 1) -th row of the multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 23 shows voltage waveforms applied to transistors corresponding to pixels in even-numbered columns n-th and (n + 1) -th rows of the multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 24 is a plan structural view of a multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 25 is a plan structural view of a multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 26 is a plan view of a vertical alignment type active matrix substrate of the present invention.
FIG. 27 is a plan view of a vertical alignment type active matrix substrate of the present invention.
FIG. 28 is a plan view and a sectional structure view of slits formed in the liquid crystal alignment control electrode and the transparent pixel electrode of the present invention.
FIG. 29 is a plan view and a sectional view of slits formed in the liquid crystal alignment control electrode and the transparent pixel electrode of the present invention.
FIG. 30 is a sectional structural view of a multi-domain vertical alignment type liquid crystal panel of the present invention.
FIG. 31 is a cross-sectional view of the driving principle of the multi-domain vertical alignment type liquid crystal panel of the present invention (in the case of pixel electrode negative data).
FIG. 32 is a cross-sectional view of the driving principle of the multi-domain vertical alignment type liquid crystal panel of the present invention (in the case of pixel electrode positive data).
FIG. 33 is a waveform diagram of voltages applied to the thin film transistors in the odd-numbered nth and (n + 1) th rows of the multi-domain vertical alignment type liquid crystal panel of the present invention.
[Explanation of sign]
1. Color filter side glass substrate
2. Black mask (light shielding film)
3. Color filter layer
4. Color filter side transparent conductive film (transparent common electrode)
5. Bump for controlling the direction of vertically aligned liquid crystal molecules
6. Color filter side vertical alignment film
7. Active matrix substrate side vertical alignment film
8 ... Transparent pixel electrode
9 ... Slit opening formed on the pixel electrode side
10. Passivation film
11 ... Video signal wiring
12 ... Gate insulation film
13 ... Active matrix element side glass substrate
14... Negative dielectric anisotropy liquid crystal
15. Liquid crystal alignment control electrode
16 ... Thin film transistor element
17 Scan line
18 Contact hole
19 ... Upper liquid crystal alignment control electrode
20. Lower liquid crystal alignment control electrode
21 ... Transparent common electrode potential
22 ... Odd-sequence video signal wiring waveform
23 ... n-row scanning line signal waveform
24 (n + 1) row scanning line signal waveform
25 ... n row upper liquid crystal alignment control electrode signal waveform
26 ... n row lower liquid crystal alignment control electrode signal waveform
27 (n + 1) row upper liquid crystal alignment control electrode signal waveform
28 (n + 1) row lower liquid crystal alignment control electrode signal waveform
29 ...... Even-number video signal wiring waveform
30 (n-1) row scanning line connection terminals
31 ... n row upper liquid crystal alignment control electrode connection terminal
32 ... n row lower liquid crystal alignment control electrode connection terminal
33 ... n-row scanning line connection terminal
34 (n + 1) row upper liquid crystal alignment control electrode connection terminal
35 (n + 1) row lower liquid crystal alignment control electrode connection terminal
36 (n + 1) row scanning line connection terminals
37 ... Hole opening formed on the pixel electrode side
38 (n-1) row liquid crystal alignment control electrode connection terminals
39 ... n-row liquid crystal alignment control electrode connection terminal
40 ... Video signal wiring terminal
41 ... Pixel peripheral common electrode terminal
42 .. Static electricity protection circuit
43 (n-1) Row scanning line signal waveform
44 ... n-row liquid crystal alignment control electrode signal waveform
45 (n + 1) row liquid crystal alignment control electrode signal waveform

Claims

On a substrate, run the No. wiring and the video signal wiring scanning signal, a thin film transistor formed at each intersection of the scanning signal lines and the video signal lines, transparent plurality of slits that are connected to the thin film transistor is formed An active matrix substrate having a pixel electrode, a liquid crystal alignment direction control electrode formed by interposing an insulating film below a slit of the transparent pixel electrode, a color filter substrate facing the active matrix substrate, and the active matrix substrate and the color filter substrate sandwiched by the negative color active matrix type vertically aligned consisting of dielectric anisotropy the liquid crystal layer scheme Oite the liquid crystal display device, active matrix substrate and the color filter liquid crystal is vertical alignment between the substrates Apply a voltage to the molecule in two different directions or four different directions To make fallen a crystal molecules, the liquid crystal display device characterized by the formation of the two kinds of electrode structures following in one pixel of the active matrix substrate.
i) A transparent solid electrode is used on the color filter substrate side, and an elongated slit-like pattern (there is no transparent electrode in the slit portion) is formed on the transparent pixel electrode on the active matrix substrate side facing this. A liquid crystal alignment direction control electrode is not formed below the slit portion.
ii) A transparent solid electrode is used on the color filter substrate side, an elongated slit-like pattern is formed on the transparent pixel electrode on the side of the active matrix substrate, and an insulating film is placed under the slit. Then, a liquid crystal alignment direction control electrode is formed which is substantially the same shape as the slit and is larger in size than the slit.

Regarding the liquid crystal display equipment of claim 1, the potential of the active matrix substrate side transparent pixel electrode separated for each pixel of, when lower than the potential of the opposing color filter substrate side of the solid common electrode, a transparent pixel The potential of the liquid crystal alignment direction control electrode installed below the slit of the electrode is set lower than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode is the potential of the solid common electrode on the opposite color filter substrate side. Is higher than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode and the liquid crystal alignment direction are controlled. the potential of the electrode is vertical to relative potential of the common electrode of the color filter substrate side, each vertical scanning period, using a drive kinematic scheme you characterized by reversing the polarity Alignment mode liquid crystal display device.

On a substrate, running a No. wiring and the video signal wiring scanning signal, a thin film transistor formed at each intersection of the scanning signal lines and the video signal lines, transparent plurality of slits that are connected to the thin film transistor is formed a pixel electrode, an active matrix substrate having a lower liquid crystal alignment direction control electrode formed via an insulating film of the slit before Symbol transparent pixel electrode, a color filter substrate facing the active matrix substrate, the active matrix Oite the negative dielectric anisotropic liquid crystal layer and the color active matrix type vertically aligned mode liquid crystal display device consisting of which is clamped substrate and the color filter substrate, a liquid crystal which is vertically aligned between the active matrix substrate and the color filter substrate Apply voltage to the molecules and separate the liquid crystal components in two or four different directions To make fallen to, a liquid crystal display device characterized by the formation of the two kinds of electrode structures following in one pixel of the active matrix substrate.
a transparent solid electrode in i) a color filter substrate side, the transparent pixel electrode of the active matrix substrate side facing the this, the transparent electrode is an elongated slit-shaped pattern (slit part no.) are formed The liquid crystal alignment direction control electrode is not formed below the slit portion.
ii) A transparent solid electrode is used on the color filter substrate side, and an elongated slit-like pattern is formed on the transparent pixel electrode on the side of the active matrix substrate, which is opposed to the transparent pixel electrode. There are two rows of liquid crystal alignment direction control electrodes that are separated from each other and are set to different potentials, and one of these liquid crystal alignment direction control electrodes is formed into the elongated slit-like pattern. The liquid crystal alignment direction control electrodes that are almost the same shape as the above, are oversized than the slits, and are separated from each other in the scanning signal wiring direction in the direction of the scanning signal wiring. It is disposed below the elongated slit formed in the electrode.

Regard the liquid crystal display equipment of claim 3, the potential of the active matrix substrate side transparent pixel electrode separated for each pixel of when the lower than the potential of the opposing color filter substrate side of the solid common electrode, the transparent pixel electrode The potential of the liquid crystal alignment direction control electrode installed in the lower layer of the slit is set lower than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode is higher than the potential of the solid common electrode on the opposite color filter substrate side. When high, the potential of the liquid crystal alignment direction control electrode installed below the slit of the transparent pixel electrode is set higher than the potential of the transparent pixel electrode, and is arranged close to both sides of the scanning signal wiring The liquid crystal alignment direction control electrode potentials are set to different polar potentials, and the liquid crystal alignment direction potential is separated from the potential of the transparent pixel electrode and is separated and independent in one pixel. Each of the potential of the alignment control electrode, for every vertical scanning period with respect to the potential of the common electrode of the color filter substrate side, a vertical alignment mode liquid crystal display device using a driving dynamic scheme you characterized by reversing the polarity.

On a substrate, run the No. wiring and the video signal line scanning signal, before Symbol scan signal and the thin film transistor formed at each intersection between the wiring and the video signal lines, transparent plurality of slits that are connected to the thin film transistor is formed An active matrix substrate having a pixel electrode, a liquid crystal alignment control electrode formed by interposing an insulating film under a slit of the transparent pixel electrode, a color filter substrate facing the active matrix substrate, and the active matrix substrate; The transparent pixel electrode which is composed of a negative dielectric anisotropy liquid crystal layer held on the color filter substrate and which is adjacent in the direction of the scanning signal wiring is connected to a thin film transistor controlled by different scanning signal wiring. color active matrix type vertically aligned mode Oite to a liquid crystal display device are, In order to apply a voltage to the liquid crystal molecules vertically aligned between the active matrix substrate and the color filter substrate and cause the liquid crystal molecules to be struck in two different directions or in four different directions, the following two types of electrode structures are used: A liquid crystal display device formed in one pixel.
i) A transparent solid electrode is used on the color filter substrate side, and an elongated slit-like pattern (there is no transparent electrode in the slit portion) is formed on the transparent pixel electrode on the active matrix substrate side facing this. The liquid crystal alignment direction control electrode is not formed below the slit portion.
ii) a transparent solid electrode in a color filter substrate side, the transparent pixel electrode of the active matrix substrate side facing the this, to form an elongated slit-like pattern, an insulating film in the lower layer of the slit Thus, a liquid crystal alignment direction control electrode is formed which has substantially the same shape as the slit and is larger in size than the slit.

Regarding the liquid crystal display equipment of claim 5, the potential of the active matrix substrate side transparent pixel electrode separated for each pixel of, when lower than the potential of the opposing color filter substrate side of the solid common electrode, a transparent pixel The potential of the liquid crystal alignment direction control electrode installed below the slit of the electrode is set lower than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode is the potential of the solid common electrode on the opposite color filter substrate side. Is higher than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode and the liquid crystal alignment direction control electrode are set higher than the potential of the transparent pixel electrode. the potential, vertical is used with respect to the potential of the common electrode of the color filter substrate side, each vertical scanning period, the driving dynamic scheme you characterized by reversing the polarity Countercurrent system liquid crystal display device.

On a substrate, run scanning signal No. wiring and the video signal lines, a plurality of holes prior Symbol scanning signal lines and a circular or polygonal connected and formed a thin film transistor, prior Symbol TFT at each intersection between the data signal wiring preparative a thin long slits are transparent pixel electrodes formed, an active matrix substrate having a liquid crystal alignment direction control electrode in a lower layer of the slit of the transparent pixel electrode is formed via an insulating film, the active matrix substrate a color filter substrate facing the active matrix substrate and the color filter substrate sandwiched been Oite the negative dielectric anisotropic liquid crystal layer and the color active matrix type vertically aligned mode liquid crystal display device consisting of an active matrix substrate and by applying a voltage to the liquid crystal molecules are vertical aligned between the color filter substrate, a multi The liquid crystal display device, characterized in that two kinds of electrode structures below to make fallen liquid crystal molecules were formed in one pixel of the active matrix substrate countercurrent.
a transparent solid electrode in i) a color filter substrate side, the transparent pixel electrode of the active matrix substrate side facing the this, the circular or hole (holes in the portion of the polygon transparent electrode is not.) is Many are formed , and the liquid crystal alignment direction control electrode is not formed below the hole.
ii) A transparent solid electrode is used on the color filter substrate side, an elongated slit-like pattern is formed on the transparent pixel electrode on the opposite side of the active matrix substrate, and an insulating film is placed under the slit. Then, a liquid crystal alignment direction control electrode is formed which is substantially the same shape as the slit and is larger in size than the slit.

Regarding the liquid crystal display equipment of claim 7, when the potential of the transparent pixel electrode separated for each pixel of the active matrix substrate side is lower than the potential of the color filter substrate side of the solid common electrode facing the transparent pixel electrode The potential of the liquid crystal alignment direction control electrode installed in the lower layer of the slit is set lower than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode is lower than the potential of the solid common electrode on the opposite color filter substrate side When it is high, the potential of the liquid crystal alignment direction control electrode installed below the slit of the transparent pixel electrode is set higher than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode and the potential of the liquid crystal alignment direction control electrode , relative to the potential of the common electrode of the color filter substrate side, each vertical scanning period, a vertical orientation using the drive kinematic scheme you characterized in that reversing the polarity Formula liquid crystal display device.

On a substrate, the scanning signal No. wiring and the video signal wiring running, a thin film transistor formed at each intersection of the front Symbol scanning signal lines and the video signal lines, a plurality of holes of connected circular or polygonal to said thin film transistor and the transparent pixel electrode thin long slits are formed, an active matrix substrate having a liquid crystal alignment direction control electrode in a lower layer of the slit of the transparent pixel electrode is formed via an insulating film, the active matrix substrate a color filter substrate facing the active matrix substrate and Oite before Symbol color active matrix type vertically aligned mode liquid crystal display device having a negative dielectric anisotropy liquid crystal layer sandwiched color filter substrate, the active matrix substrate a color by applying a voltage to the liquid crystal molecules are vertical aligned between the filter substrate, a multi The liquid crystal display device comprising countercurrent, that is formed in one pixel of the active matrix substrate two kinds of electrode structures below to make fallen liquid crystal molecules.
i) A transparent solid electrode is used on the color filter substrate side, and the transparent pixel electrode on the active matrix substrate side facing this has many circular or polygonal holes (there is no transparent electrode in the hole portion). The liquid crystal alignment direction control electrode is not formed below the hole.
ii) A transparent solid electrode is used on the color filter substrate side, and an elongated slit-like pattern is formed on the transparent pixel electrode on the side of the active matrix substrate facing the transparent electrode, and an elongated slit-like pattern is formed on the transparent pixel electrode. In the lower layer of the transparent pixel electrode, there are two rows of liquid crystal alignment direction control electrodes that are separated from each other and are set to different potentials. Either one of the liquid crystal alignment direction control electrodes has substantially the same shape as the elongated slit-shaped pattern, is larger in size than the slits, and two rows of liquid crystal alignment direction control electrodes that are separated and independent from each other, In the scanning signal wiring direction, they are arranged at a lower layer of an elongated slit formed in the transparent pixel electrode so as to be replaced with each other at regular pixel periods.

Regarding the liquid crystal display equipment of claim 9, the potential of the active matrix substrate side transparent pixel electrode separated for each pixel of, when lower than the potential of the opposing color filter substrate side of the solid common electrode, a transparent pixel The potential of the liquid crystal alignment direction control electrode installed below the slit of the electrode is set lower than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode is larger than the potential of the solid common electrode on the color filter substrate side facing Is higher than the potential of the transparent pixel electrode, and is disposed close to both sides of the scanning signal wiring. The liquid crystal alignment direction control electrode potential is set to different polar potentials, and the liquid crystal alignment potential is separated and independent in one pixel. Each of the potential of the alignment control electrode, for every vertical scanning period with respect to the potential of the common electrode of the color filter substrate side, a vertical alignment mode liquid crystal display device using a driving dynamic scheme you characterized by reversing the polarity.

On a substrate, the scanning signal No. wiring and the video signal wiring run, a thin film transistor formed at each intersection of the front Symbol scanning signal lines and the video signal lines, a plurality of holes of connected circular or polygonal to said thin film transistor and the transparent pixel electrode thin long slits are formed, an active matrix substrate having a liquid crystal alignment direction control electrode in a lower layer of the slit of the transparent pixel electrode is formed via an insulating film, the active matrix substrate The transparent pixel electrodes adjacent to each other in the direction of the scanning signal wiring are composed of an opposing color filter substrate, the active matrix substrate, and a negative dielectric anisotropy liquid crystal layer sandwiched between the color filter substrates. Color active matrix connected to thin film transistors controlled by different scanning signal lines Oite the mold vertically aligned mode liquid crystal display device, by applying a voltage to the liquid crystal molecules vertically aligned between the active matrix substrate and the color filter substrate, in order to make fallen liquid crystal molecules in multiple directions, two kinds of electrodes follows A liquid crystal display device characterized in that the structure is formed in one pixel of an active matrix substrate.
i) A transparent solid electrode is used on the color filter substrate side, and the transparent pixel electrode on the active matrix substrate side facing this has many circular or polygonal holes (there is no transparent electrode in the hole portion). The liquid crystal alignment direction control electrode is not formed below the hole.
ii) A transparent solid electrode is used on the color filter substrate side, an elongated slit-like pattern is formed on the transparent pixel electrode on the opposite side of the active matrix substrate, and an insulating film is placed under the slit. A liquid crystal alignment direction control electrode is formed which is substantially the same shape as the slit and is larger in size than the slit.

Regarding the liquid crystal display equipment of claim 11, the potential of the transparent pixel electrode separated for each pixel of the active matrix substrate side, when lower than the potential of the opposing color filter substrate side of the solid common electrode, transparent The potential of the liquid crystal alignment direction control electrode installed in the lower layer of the slit of the pixel electrode is set lower than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode is opposite to the solid common electrode on the color filter substrate side. When the potential is higher than the potential, the potential of the liquid crystal alignment direction control electrode installed below the slit of the transparent pixel electrode is set higher than the potential of the transparent pixel electrode, and the potential of the transparent pixel electrode and the liquid crystal alignment direction control are set. the potential of the electrode is vertical to relative potential of the common electrode of the color filter substrate side, each vertical scanning period, using a drive kinematic scheme you characterized by reversing the polarity Alignment mode liquid crystal display device.

According to any one of claims 1, 3, 5, and elongated extending slit formed in the transparent pixel electrode of the active matrix substrate side, the slit and the scanning signal line direction became the liquid crystal alignment direction control electrode and set A vertical alignment type liquid crystal display device, wherein the liquid crystal display devices are alternately arranged while having a substantially parallel relationship with each other in a direction of an angle of approximately ± 45 degrees with respect to each other .

According to any one of claims 1, 3, 5, elongated extending slit formed in the transparent pixel electrode of the active matrix substrate side is disposed in the direction of an angle of ± 45 degrees with respect to the direction of the scanning signal lines The slits that are paired with the liquid crystal alignment direction control electrode are arranged in a direction parallel to and perpendicular to the scanning signal wiring direction, and the liquid crystal alignment direction control electrode is disposed on the outer periphery of the pixel electrode. A vertical alignment type liquid crystal display device characterized by a structure in which a pixel electrode and an insulating film are interposed between each other .

According to any one of claims 1, 3, 5, and a direction parallel elongated extending slit formed in the transparent pixel electrode of the active matrix substrate side with respect to the direction of scanning signal lines, perpendicular to the direction in which The slit that is arranged and paired with the liquid crystal alignment direction control electrode is arranged in parallel to the scanning signal wiring direction, and the liquid crystal alignment direction control electrode is insulated from the pixel electrode at the outer periphery of the pixel electrode. A vertical alignment type liquid crystal display device characterized by a structure in which a film is interposed while being covered .

According to any one of claims 1, 3, 5, elongated extending slit formed in the transparent pixel electrode of the active matrix substrate side, the direction parallel to the run scanning signal No. wiring direction, arranged in a direction perpendicular A vertical alignment type liquid crystal display device, characterized in that a slit that is paired with a liquid crystal alignment direction control electrode is disposed in an angle of ± 45 degrees with respect to the scanning signal wiring direction .

12. The slit combined with the liquid crystal alignment direction control electrode according to claim 7 , 9 , or 11 so as to enclose a plurality of circular or polygonal holes formed in the transparent pixel electrode on the active matrix substrate side. but the direction parallel to the scanning signal line direction, are arranged in a direction perpendicular, the outer peripheral portion of the or one pixel electrode in the liquid crystal alignment direction control electrode, and while the overlap through the pixel electrode and the insulating film A vertical alignment type liquid crystal display device characterized by a constricted structure .

According to any one of claims 1,3,5,7,9,11, the liquid crystal alignment direction control electrode formed via an insulation layer on the lower layer of the slit of transparency pixel electrodes, scanning signal lines formed A vertical alignment type liquid crystal display device characterized in that it is sometimes formed in the same layer at the same time .

Added by any one of claims 1,3,5,7,11, and the liquid crystal alignment direction control electrode in a lower layer of the slit formed through an insulator layer of transparency pixel electrodes, and the transparent pixel electrode A vertical alignment type liquid crystal display device characterized by forming a capacitor .

According to claim 3 or 9, both of the connection terminals of the run scanning signal No. wiring and the liquid crystal alignment direction control electrode is arranged on either the left or right side of the display screen portion, sandwiched connection terminal portions of the scanning signal lines 2. A vertical alignment type liquid crystal display device, wherein connection terminals of two rows of liquid crystal alignment direction control electrodes for controlling one row of pixels are arranged .

According to claim 5 or 11, both of the connection terminals of the running scanning signal No. wiring and the liquid crystal alignment direction control electrode is arranged on either the left or right side of the display screen portion, sandwiched connection terminal portions of the scanning signal lines A vertical alignment type liquid crystal display device, wherein connection terminals of liquid crystal alignment direction control electrodes for controlling a row of pixels are arranged .

According to any one of claims 1,3,5,7,9,11, connecting terminal portions of the run scanning signal No. wiring are arranged in either one-way to the left or right side of the display screen unit and the liquid crystal alignment direction control The vertical alignment type liquid crystal display device, wherein the connection terminal portion of the electrode is disposed on the other side different from the connection terminal portion of the scanning line .

According to claim 3 or 9, both both running scanning signal No. wiring and the liquid crystal alignment direction control electrode, the connection terminals are arranged on the left and right sides of the display screen portion, and sandwiched connection terminal portions of the scanning signal lines, 2. A vertical alignment type liquid crystal display device, wherein connection terminals of two rows of liquid crystal alignment direction control electrodes for controlling one row of pixels are arranged .

According to claim 5 or 11, both both run scanning signal No. wiring and the liquid crystal alignment direction control electrode, the connection terminals are arranged on the left and right sides of the display screen portion, and sandwiched connection terminal portions of the scanning signal lines, A vertical alignment type liquid crystal display device comprising a connection terminal portion of a liquid crystal alignment direction control electrode for controlling a row of pixels.

Applied according to any one of claims 1,3,5,7,9,11, when the display of the moving image, between which is formed in the lower layer of the slit of the transparent pixel electrode liquid crystal alignment direction control electrode and the transparency pixel electrodes A vertical alignment type liquid crystal display device characterized in that the bias voltage to be applied is made larger than that during still image display, and the rate at which the negative dielectric anisotropy liquid crystal molecules sag is increased.