JP3691196B2 - Liquid crystal display device - Google Patents

Description

【０１１８】
表１より、液晶表示装置の表示エリアの外周部の各辺のシール５上に存在する表示用電極およびダミー電極の介在率および重なり率が、ほぼ同一になっていることが分かる。この場合、介在率は、表示用電極および電極間ダミー電極の介在率と２重ダミー電極の介在率との和である。また、このときの表示用電極の配線抵抗は、各辺で均一となるように設計されている。
【０１１９】
そして、上記のように設計された表示用電極およびダミー電極を有する信号電極基板１・走査電極基板２を用いてＳＴＮ型カラー液晶表示装置を形成した結果、表示エリア外周部の４辺それぞれの明るさの濃淡が均一となった。さらに、シール５中に含まれるシール内スペーサ６のガラスビーズの直径を調整することによって、４辺全ての表示エリアのシール近傍の明るさの濃淡を、表示エリア中央部の明るさの濃淡に合わせることが可能となった。
【０１２０】
なお、各走査電極引回し部１６間および各信号電極引回し部１５間のシール５上の空間に設けられたダミー電極の介在率および重なり率も上記の走査電極引回し部１６および信号電極引回し部１５の表示用電極およびダミー電極の介在率および重なり率、および液晶封入口側電極部１７のダミー電極の介在率および重なり率に合わせて４辺でほぼ同じになるように揃えている。
【０１２１】
〔実施例２〕
本発明の他の実施例について図１３ないし図１９に基づいて説明すれば、以下の通りである。なお、説明の便宜上、前記の実施例１において、定義した電極ピッチおよび線幅に使用した記号をそのまま使用するものとする。
【０１２２】
本実施例では、前記の実施の形態２で説明した走査電極引回し部３２、信号電極引回し部３１、液晶封入口側電極部３３における表示用電極およびダミー電極のシール５での介在率および重なり率のバラツキについて述べる。
【０１２３】
なお、本実施例では、前記の実施例１同様、設計の簡易化のために、“電極の線幅／電極ピッチ”を介在率とし、また、“対向する２電極の線幅のうち狭い方の線幅／電極ピッチ”を重なり率として、走査電極引回し部３２、信号電極引回し部３１および液晶封入口側電極部３３の設計を行っている。
【０１２４】
それぞれの電極引回し部では、２重ダミー電極が電極引回し部に重なるように、それぞれ対向する基板上に形成されている。さらに、端子部Ｉ・IIの端子群の間にもダミー電極が、介在率および重なり率を一定にするように形成されている。
【０１２５】
前記の実施例１と相違するところは、２重ダミー電極の線幅を対向する電極の線幅と異ならせて設計する点であり、これは、電極引回し部の配線抵抗と、介在率および重なり率を所定の範囲の値にするためである。
【０１２６】
そして、図１１に示したように、端子部Ｉに比べて端子部IIは３倍の本数の接続端子を持ち、端子部IIから延びる表示用電極の幅は、端子部Ｉから延びる表示用電極の幅に比べて約１／３になっており、端子部IIの引回し電極３１のピッチは端子部Ｉのピッチよりも狭く形成されている。そのため、端子部Ｉの走査電極引回し部３２の引回し電極１９間には電極間ダミー電極２０が形成されているが、端子部IIの信号電極引回し部３１の引回し電極２３間には電極間ダミー電極は形成されていない。
【０１２７】
また、液晶封入口側電極部３３は、シール５の電極の介在率を他の辺とほぼ同一にするため、シール５部分の表示用電極およびダミー電極の電極幅を狭めてある。
【０１２８】
まず、走査電極引回し部３２の場合、図１４および図１５に示すように、引回し電極１９の直線部１９ａの電極ピッチａを０．１８００ｍｍ、直線部１９ａの線幅ｂを０．０８６４ｍｍ、電極間ダミー電極２０の線幅ｃを０．０５３６ｍｍ、引回し電極１９の傾斜部１９ｂの電極ピッチｄを０．１５２０ｍｍ、傾斜部１９ｂの線幅ｅを０．１３２０ｍｍとして設計されるとともに、引回し電極１９の直線部１９ａに対応する２重ダミー電極３４の電極ピッチｌを０．１８００ｍｍ、直線部１９ａに対応する２重ダミー電極３４の線幅ｍを０．０４９２ｍｍ、電極間ダミー電極２０に対応する２重ダミー電極３４の線幅ｎを０．０７００ｍｍ、引回し電極１９の傾斜部１９ｂに対応する２重ダミー電極３４の電極ピッチｏを０．１５２０ｍｍ、傾斜部１９ｂに対応する２重ダミー電極３４の線幅ｐを０．０８６９ｍｍとして設計される。
【０１２９】
つぎに、信号電極引回し部３１の場合、図１６および図１７に示すように、引回し電極２３の直線部２３ａの電極ピッチｆを０．０７００ｍｍ、直線部２３ａの線幅ｇを０．０４００ｍｍ、引回し電極２３の傾斜部２３ｂの電極ピッチｈを０．０６４２ｍｍ、傾斜部２３ｂの線幅ｉを０．０４９２ｍｍとして設計されるとともに、引回し電極２３の直線部２３ａに対応する２重ダミー電極３５の電極ピッチｑを０．０７００ｍｍ、直線部２９ａに対応する２重ダミー電極３５の線幅ｒを０．０５３６ｍｍ、引回し電極２３の傾斜部２３ｂに対応する２重ダミー電極３５の電極ピッチｓを０．０６４２ｍｍ、傾斜部２３ｂに対応する２重ダミー電極３５の線幅ｔを０．０３６７ｍｍとして設計される。
【０１３０】
最後に、液晶封入口側電極部３３の場合、図１８および図１９に示すように、延設電極２５の電極ピッチｊを０．２４００ｍｍ、延設電極２５の線幅ｋを０．２０８４ｍｍとして設計されるとともに、２重ダミー電極３６の電極ピッチｕを０．２４００ｍｍ、２重ダミー電極３６の線幅ｖを０．１３７１ｍｍとして設計されている。
【０１３１】
このようにして設計された、走査電極引回し部３２、信号電極引回し部３１および液晶封入口側電極部３３を有する、図１３に示すような、液晶表示装置での表示用電極およびダミー電極の介在率および重なり率は、以下の表２に示すようになる。
【０１３２】
【表２】

【０１３３】
表２より、液晶表示装置の表示エリアの外周部の各辺のシール５上に存在する表示用電極およびダミー電極の介在率および重なり率が、ほぼ同一になっていることが分かる。この場合、介在率は、表示用電極および電極間ダミー電極の介在率と２重ダミー電極の介在率との和である。また、このときの表示用電極の配線抵抗は、各辺で均一となるように設計されている。
【０１３４】
そして、上記のように設計された表示用電極およびダミー電極を有する信号電極基板１・走査電極基板２を用いてＳＴＮ型カラー液晶表示装置を形成した結果、表示エリア外周部の４辺それぞれの明るさの濃淡が均一となった。さらに、シール５中に含まれるシール内スペーサ６のガラスビーズの直径を調整することによって、４辺全ての表示エリアのシール近傍の明るさの濃淡を、表示エリア中央部の明るさの濃淡に合わせることが可能となった。
【０１３５】
なお、各走査電極引回し部３２…および各信号電極引回し部３１…同士間のシール５上の空間に設けられたダミー電極の介在率および重なり率も上記の走査電極引回し部３２および信号電極引回し部３１の表示用電極およびダミー電極の介在率および重なり率、および液晶封入口側電極部３３のダミー電極の介在率および重なり率に合わせて４辺でほぼ同じになるように揃えている。
【０１３６】
上記の介在率および重なり率は、設計上の介在率および重なり率であり、実際に信号電極基板１と走査電極基板２をシール５によって貼り合わせた場合には、エッチング等の製造工程により表示用電極およびダミー電極の介在率および重なり率が若干変わるおそれがある。
【０１３７】
そこで、本実施例では、液晶表示装置完成後において、表示用電極およびダミー電極の介在率および重なり率の測定を行った。この測定には、前述した表２に示す設計条件に基づいて形成された液晶表示装置を２つ用いた。そして、この測定結果は、以下の表３・４に示すようになった。
【０１３８】
【表３】

【０１３９】
【表４】

【０１４０】
上記の表３・４から、表２に示す設計条件に比べて表示用電極およびダミー電極の４辺での重なり率のバラツキが大きくなっていることが分かる。しかしながら、表３・４程度の表示エリアにおける４辺での重なり率のバラツキでは、明るさの濃淡の差が若干異なるが、許容レベルであった。つまり、表２で示した設計条件に基づいて形成された液晶表示装置では、シール５の４辺での表示用電極およびダミー電極の重なり率に多少のバラツキは生じるものの、表示エリアの中央部とシール５近傍との濃淡ムラを許容範囲内に低減することができることがわかった。
【０１４１】
上記のシール５の４辺での重なり率のバラツキは、４辺で０％に近いほど表示品位は向上するが、表３・４から、シール５の４辺での重なり率のバラツキが±５％以下であれば良品レベルとなることが分かる。そして、重なり率のバラツキが±３％以内であれば、さらに品位は向上し、±１％以内に抑えることができれば、４辺での濃淡差の無い高品位の表示を可能とすることができる。
【０１４２】
よって、本実施例の場合、４辺での重なり率のバラツキの所定値は、±５％が好ましく、さらに±３％が好ましく、より好ましくは±１％である。４辺での重なり率のバラツキの所定値を設定し、重なり率の絶対値のバラツキをこの所定値以下となるように、シール５の４辺での表示用電極およびダミー電極を形成すれば、シール内で支柱の役割を果たすことによりシール５の厚みを決定しているシール内スペーサ６のガラスビーズの存在率がほぼ一定となり、シール５の厚みを４辺でほぼ同一にすることができる。これにより、表示エリアのシール５近傍の４辺での濃度ムラを低減することができるので、表示品位を向上させることができる。
【０１４３】
また、介在率の４辺でのバラツキの絶対値を±１０％以下に抑えるように、シール５の４辺での表示用電極およびダミー電極を形成すれば、シール５上でシール内スペーサ６のガラスビーズが、表示用電極とダミー電極とに挟持される部分、表示用電極またはダミー電極のみが存在する部分で挟持される部分、および上記の何れの電極も存在しない部分で挟持される部分の専有する割合の４辺でのバラツキの絶対値が所定値以下となり、シール５の厚みを４辺でほぼ同一にすることができる。これにより、表示エリアのシール５近傍の４辺での濃度ムラを低減することができるので、表示品位を向上させることができる。
【０１４４】
なお、上記介在率および重なり率のバラツキは、上述したようにエッチング等の製造工程によって決定される。したがって、表示用電極やダミー電極の形成時のエッチング精度を向上させて、エッチングによるバラツキを低減することにより、介在率および重なり率のバラツキを０％に限りなく近づけることができ、表示品位をさらに向上させることができる。
【０１４５】
〔実施例３〕
本発明のさらに他の実施例について図２０ないし図２４に基づいて説明すれば、以下の通りである。説明の便宜上、前記の実施例１および２において、定義した電極ピッチおよび線幅に使用した記号をそのまま使用するものとする。
【０１４６】
本実施例では、前記の実施の形態３で説明した走査電極引回し部４２、信号電極引回し部４１、液晶封入口側電極部４３における表示用電極およびダミー電極のシール５での介在率および重なり率のバラツキについて述べる。
【０１４７】
なお、本実施例では、前記の実施例１および２同様、設計の簡易化のために、“電極の線幅／電極ピッチ”を介在率とし、また、“対向する２電極の線幅のうち狭い方の線幅／電極ピッチ”を重なり率として、走査電極引回し部４２、信号電極引回し部４１および液晶封入口側電極部４３の設計を行っている。
【０１４８】
それぞれの電極引回し部では、２重ダミー電極が電極引回し部に重なるように、それぞれ対向する基板上に形成されている。さらに、端子部Ｉ・IIの端子群の間についてもダミー電極が、介在率および重なり率を一定にするように形成されている。
【０１４９】
本実施例は、電極引回し部の配線抵抗と、介在率および重なり率を所定の範囲の値にするため、前記の実施例１と相違して２重ダミー電極の線幅を対向する電極の線幅と異ならせて設計する点で、前記の実施例２と同様である。
【０１５０】
そして、図１１に示したように、端子部Ｉに比べて端子部IIは３倍の本数の接続端子を持っている。したがって、端子部IIから延びる表示用電極の幅は、端子部Ｉから延びる表示用電極の幅に比べて約１／３になっており、端子部IIの引回し電極３１のピッチは端子部Ｉのピッチよりも狭く形成されている。そのため、端子部Ｉの走査電極引回し部３２の引回し電極１９間には電極間ダミー電極２０が形成されているが、端子部IIの信号電極引回し部３１の引回し電極２３間には電極間ダミー電極は形成されていない。
【０１５１】
また、液晶封入口側電極部３３は、シール５の電極の介在率を他の辺とほぼ同一にするため、シール５において表示用電極およびダミー電極の電極幅を狭めてある。
【０１５２】
まず、走査電極引回し部４２の場合、図２１および図２２に示すように、引回し電極１９の直線部１９ａの電極ピッチａを０．２４００ｍｍ、直線部１９ａの線幅ｂを０．０４７６ｍｍ、電極間ダミー電極２０の線幅ｃを０．１５２４ｍｍ、引回し電極１９の傾斜部１９ｂの電極ピッチｄを０．１４１３ｍｍ、傾斜部１９ｂの線幅ｅを０．１１８３ｍｍとして設計されるとともに、引回し電極１９の直線部１９ａに対応する２重ダミー電極４４の電極ピッチｌを０．２４００ｍｍ、直線部１９ａに対応する２重ダミー電極４４の線幅ｍを０．０３１９ｍｍ、電極間ダミー電極２０に対応する２重ダミー電極４４の線幅ｎを０．０７９７ｍｍ、引回し電極１９の傾斜部１９ｂに対応する２重ダミー電極４４の電極ピッチｏを０．１４１３ｍｍ、傾斜部１９ｂに対応する２重ダミー電極４４の線幅ｐを０．０６５７ｍｍとして設計される。
【０１５３】
つぎに、信号電極引回し部４１の場合、図２３に示すように、引回し電極２３の直線部２３ａの電極ピッチｆを０．０８６０ｍｍ、直線部２３ａの線幅ｇを０．０４００ｍｍ、引回し電極２３の傾斜部２３ｂの電極ピッチｈを０．０７３２ｍｍ、傾斜部２３ｂの線幅ｉを０．０５７２ｍｍとして設計されるとともに、引回し電極２３の直線部２３ａに対応する２重ダミー電極４５の電極ピッチｑを０．０８６０ｍｍ、直線部２９ａに対応する２重ダミー電極４５の線幅ｒを０．０６７２ｍｍ、引回し電極２３の傾斜部２３ｂに対応する２重ダミー電極４５の電極ピッチｓを０．０７３２ｍｍ、傾斜部２３ｂに対応する２重ダミー電極４５の線幅ｔを０．０３４０ｍｍとして設計される。
【０１５４】
最後に、液晶封入口側電極部４３の場合、図２４に示すように、延設電極２５の電極ピッチｊを０．３５１０ｍｍ、延設電極２５の線幅ｋを０．２９３９ｍｍとして設計されるとともに、２重ダミー電極４６の電極ピッチｕを０．３５１０ｍｍ、２重ダミー電極４６の線幅ｖを０．１６３３ｍｍとして設計される。
【０１５５】
このようにして設計された、走査電極引回し部４２、信号電極引回し部４１および液晶封入口側電極部４３を有する、図２０に示すような、液晶表示装置での表示用電極およびダミー電極の介在率および重なり率は、以下の表５に示すようになる。
【０１５６】
【表５】

【０１５７】
表５より、液晶表示装置の表示エリアの外周部の各辺のシール５上に存在する表示用電極およびダミー電極の介在率および重なり率が、ほぼ同一になっていることが分かる。この場合、介在率は、表示用電極および電極間ダミー電極の介在率と２重ダミー電極の介在率との和である。このときの表示用電極の配線抵抗は、各辺で均一となるように設計されている。
【０１５８】
そして、上記のように設計された表示用電極およびダミー電極を有する信号電極基板１と走査電極基板２を用いてＳＴＮ型カラー液晶表示装置を形成した結果、表示エリア外周部の４辺それぞれの明るさの濃淡が均一となった。さらに、シール５中に含まれるシール内スペーサ６のガラスビーズの直径を調整することによって、４辺全ての表示エリアのシール近傍の明るさの濃淡を、表示エリア中央部の明るさの濃淡に合わせることが可能となった。
【０１５９】
なお、各走査電極引回し部４２…および各信号電極引回し部４１…同士間のシール５上の空間に設けられたダミー電極の介在率および重なり率も上記の走査電極引回し部４２および信号電極引回し部４１の表示用電極およびダミー電極の介在率および重なり率、および液晶封入口側電極部４３の介在率および重なり率に合わせて４辺でほぼ同じになるように揃えている。
【０１６０】
上記の各実施例１〜３では、電極引回し部における電極のピッチを等間隔に設計した場合について説明したが、シール５における表示用電極およびダミー電極の介在率および重なり率のバラツキを４辺でほぼ同一にすることができるようにすれば、上記ピッチを等間隔にする必要はなく、ピッチが変動するものであっても同様の効果を得ることができる。
【０１６１】
以下に、上記の実施例１〜３に対する比較例として、シール５の４辺での表示用電極およびダミー電極の介在率および重なり率のバラツキを特に考慮しないで設計した液晶表示装置について説明する。
【０１６２】
〔比較例〕
本比較例では、従来の技術で説明した図３２に示す液晶表示装置の走査電極引回し部１４４、信号電極引回し部１４３、液晶封入口側電極部１４７の設計について説明する。なお、上記の走査電極引回し部１４４、信号電極引回し部１４３、液晶封入口側電極部１４７の構成は、前記の実施例２と同じであり、各電極ピッチおよび線幅が異なっているものとする。したがって、各部の説明図は、実施例２の図１４、図１６、図１８を用いる。
【０１６３】
まず、走査電極引回し部１４４の場合、図１４に示すように、引回し電極１９の直線部１９ａの電極ピッチａを０．２０００ｍｍ、直線部１９ａの線幅ｂを０．０７４５ｍｍ、電極間ダミー電極２０の線幅ｃを０．０９９３ｍｍ、引回し電極１９の傾斜部１９ｂの電極ピッチｄを０．１５３０ｍｍ、傾斜部１９ｂの線幅ｅを０．１３８０ｍｍとして設計されるとともに、引回し電極１９の直線部１９ａに対応する２重ダミー電極３４の電極ピッチｌを０．２０００ｍｍ、直線部１９ａに対応する２重ダミー電極３４の線幅ｍを０．０５４５ｍｍ、電極間ダミー電極２０に対応する２重ダミー電極３４の線幅ｎを０．０７９３ｍｍ、引回し電極１９の傾斜部１９ｂに対応する２重ダミー電極３４の電極ピッチｏを０．２０００ｍｍ、傾斜部１９ｂに対応する２重ダミー電極３４の線幅ｐを０．１１８０ｍｍとして設計される。
【０１６４】
つぎに、信号電極引回し部１４３の場合、図１６に示すように、引回し電極２３の直線部２３ａの電極ピッチｆを０．０７１０ｍｍ、直線部２３ａの線幅ｇを０．０４１６ｍｍ、引回し電極２３の傾斜部２３ｂの電極ピッチｈを０．０６９５ｍｍ、傾斜部２３ｂの線幅ｉを０．０５４４ｍｍとして設計されるとともに、引回し電極２３の直線部２３ａに対応する２重ダミー電極３４の電極ピッチｑを０．０７１０ｍｍ、直線部２９ａに対応する２重ダミー電極３４の線幅ｒを０．０２１６ｍｍ、引回し電極２３の傾斜部２３ｂに対応する２重ダミー電極３４の電極ピッチｓを０．０６９５ｍｍ、傾斜部２３ｂに対応する２重ダミー電極３４の線幅ｔを０．０３４４ｍｍとして設計される。
【０１６５】
最後に、液晶封入口側電極部１４７の場合、図１８に示すように、延設電極２５の電極ピッチｊを０．２７３０ｍｍ、延設電極２５の線幅ｋを０．２５３０ｍｍとして設計されるとともに、２重ダミー電極３６の電極ピッチｕを０．２７３０ｍｍ、２重ダミー電極３６の線幅ｖを０．２３３０ｍｍとして設計される。
【０１６６】
このようにして設計された、走査電極引回し部１４４、信号電極引回し部１４３および液晶封入口側電極部１４７を有する、図３２に示すような、液晶表示装置での表示用電極およびダミー電極の介在率および重なり率は、以下の表６に示すようになる。
【０１６７】
【表６】

【０１６８】
表６より、液晶表示装置の表示エリアの外周部の各辺のシール５上に存在する表示用電極およびダミー電極の介在率および重なり率の値にバラツキが生じていることが分かる。この場合、介在率は、表示用電極および電極間ダミー電極の介在率と２重ダミー電極の介在率との和である。このときの表示用電極の配線抵抗は、各辺で均一となるように設計されている。
【０１６９】
そして、上記のように設計された表示用電極およびダミー電極を有する基板１４１・１４２を用いてＳＴＮ型カラー液晶表示装置を形成した結果、表示エリア外周部のシール１４５近傍の４辺それぞれの明るさの濃淡が不均一なもの（上辺と下辺は同レベル）となった。さらに、シール１４５中に含まれるシール内スペーサ６のガラスビーズの直径を調整することによっても、４辺全ての表示エリアのシール１４５近傍の明るさの濃淡を、表示エリア中央部の明るさの濃淡に合わせることが不可能であった。
【０１７０】
以上のことから、本発明のように、シール上に存在する表示用電極およびダミー電極の介在率および重なり率のバラツキを、表示エリアの４辺で所定値以下となるように、上記表示用電極およびダミー電極を形成することで、表示エリアの中央部とシール近傍との液晶層の厚みをほぼ均一にすることができる。これにより、液晶層の厚みの差により生じる明るさの濃淡のバラツキを無くすことができるので、表示品位を向上させることができる。
【０１７１】
なお、本発明の実施の形態および実施例では、液晶の特性のマージンが狭い、高表示品位、高速応答、高精細化、狭額縁を要求される液晶表示装置のうち、ＳＴＮ型カラー液晶表示装置に本発明を適用した場合について説明したが、これに限定されるものではなく、ＴＮ型の液晶表示装置においても適用可能であり、さらに他の方式の液晶表示装置にも適用可能である。
【０１７２】
また、上記した各実施の形態および実施例では、介在率および重なり率との両方が所定値内のバラツキを有するように説明したが、少なくとも重なり率が所定値内のバラツキとなるように設定すれば、シール内で支柱の役割を果たすことによりシールの厚みを決定しているガラスビーズの存在率がほぼ一定となり、シールの厚みを４辺でほぼ同一にすることができる。これにより、表示エリアのシール近傍の４辺での濃度ムラを低減することができるので、表示品位を向上させることができる。
【０１７３】
【発明の効果】
請求項１の発明の液晶表示装置は、以上のように、複数本の表示用電極が形成された一対の基板と、支柱の役割を果たすスペーサが含まれており、上記一対の基板の電極形成面を対向させて接続するためのシールと、上記一対の基板とシールとで囲まれた空間に液晶を封入して形成された液晶層と、上記液晶層の厚みを表示エリア内で均一化させるために上記一対の基板上に形成されたダミー電極とを有し、上記一対の基板に形成された対向する表示用電極は、線幅および電極ピッチが異なり、上記表示用電極およびダミー電極は、上記シール上の４辺に介在すると共に、上記表示用電極は、走査電極から上記シール部分を超えて延設された延設電極を有しており、互いに対向する電極が重なり合う領域の面積の上記シールにおける占有率を示す重なり率が上記シール上の４辺でほぼ同じになるように、上記延設電極および上記ダミー電極の線幅が上記走査電極の線幅より狭く形成されている構成である。
【０１７４】
それゆえ、シール上で、互いに対向する表示用電極およびダミー電極の重なり度合いを示す重なり率の４辺でのバラツキの絶対値が所定値以下となるように形成されているので、シール内で支柱の役割を果たすことによりシールの厚みを決定しているガラスビーズの存在率がほぼ一定となり、シールの厚みを４辺でほぼ同一にすることができる。これにより、表示エリアのシール近傍の４辺での濃度ムラを低減することができるので、表示品位を向上させることができるという効果を奏する。
【０１７５】
請求項２の発明の液晶表示装置は、以上のように、請求項１の構成に加えて、 上記表示エリア内からの表示用電極の電極引回し部は、外部回路との接続端子に対応するように複数のブロックに分割され、かつ、各ブロックの電極引回し部の電極が、表示エリア側よりも外部回路との接続端子側の方が配置密度が高くなるように形成されるとともに、上記一対の基板上に形成された表示用電極およびダミー電極のうち、表示エリア内の表示用電極および外部回路との接続端子に平行に形成された領域のシール上において対向する電極の重なり合う領域の面積の上記シールにおける占有率を示す重なり率と、上記領域以外のシール上において対向する電極の重なり合う領域の面積の上記シールにおける占有率を示す重なり率とが、上記４辺でほぼ同じになるように形成されている構成である。
【０１７６】
それゆえ、請求項１の構成による効果に加えて、表示用電極の電極引回し部が外部回路との接統端子に対応するように複数のブロックに分割され、かつ、表示エリア側の表示用引回し電極の配置密度よりも外部回路との接続端子側の表示用引回し電極の配置密度の方が高くなるように設計されることで、例えば、配線抵抗を所定値に保つために、有効表示エリア内の表示用電極と外部回路との接続端子を結ぶ電極引回し部のうち、有効表示エリア内の表示用電極に平行な領域と平行でない領域の電極幅を異ならせた場合でも、上記の有効表示エリア内の表示用電極と外部回路との接続端子を結ぶ電極引回し部のうち、有効表示エリア内の表示用電極に平行な領域と平行でない領域に対向する表示用電極およびダミー電極の重なり率のバラツキの絶対値が所定値以下となるように、表示用電極およびダミー電極を形成しているので、電極引回し部の１ブロックのうちの有効表示エリア内の表示用電極に平行な領域と平行でない領域の占有率の差による濃度ムラを低減することができ、さらに、４辺の重なり率が異なることによる濃度ムラを低減することができるという効果を奏する。
【０１７７】
請求項３の発明の液晶表示装置は、以上のように、請求項１または２の構成に加えて、上記ダミー電極は、表示用電極間に形成される電極間ダミー電極と、これら表示用電極および電極間ダミー電極が形成された基板の対向基板上に形成される２重ダミー電極とを含み、上記２重ダミー電極が、上記基板上の表示用電極および電極間ダミー電極に対向して形成される構成である。
【０１７８】
それゆえ、請求項１または２の構成による効果に加えて、基板に挟持されるシールを、上下２枚の基板とも電極を有する部分に対応するシールと、上下２枚の基板とも電極の無い部分に対応するシールとに分けることができる。つまり、一方の基板にのみ電極を有するシール部分を無くすことができる。これにより、シールに含まれるシール内スペーサのガラスビーズ等の厚み調整部材によって、シールの厚みの均一化を容易に行うことができる。しかも、シール上で対向する表示用電極およびダミー電極は、４辺での重なり率のバラツキの絶対値が所定値以下となるように形成されているので、シールの厚みを４辺でほぼ同一にすることが容易になるという効果を奏する。
【０１７９】
請求項４の発明の液晶表示装置は、以上のように、請求項３の構成に加えて、上記２重ダミー電極は、その線幅が対向する表示用電極および電極間ダミー電極の線幅と異なるように形成されている構成である。
【０１８０】
それゆえ、請求項３の構成による効果に加えて、２重ダミ一電極は、その線幅が対向する表示用電極および電極間ダミ一電極の線幅と所定値分だけ異なるように形成されていることで、表示用電極の配線抵抗値を所定値に保ちながら重なり率を調節することが可能となり、さらに、基板の貼り合わせ時の対向する電極同士のずれを吸収することができるという効果を奏する。
【０１８１】
請求項５の発明の液晶表示装置は、以上のように、請求項３または４の構成に加えて、上記重なり率が、対向する表示用電極と２重ダミー電極の重なり率と、対向する電極間ダミー電極と２重ダミー電極の重なり率との和であるという構成である。
【０１８２】
それゆえ、請求項３または４の構成による効果に加えて、対向する表示用電極およびダミー電極の重なり率が、対向する表示用電極と２重ダミー電極の重なり率と、電極間ダミー電極と２重ダミー電極の重なり率との和であることで、表示用電極と２重ダミー電極の重なり率と、電極間ダミー電極と２重ダミー電極の重なり率とがそれぞれ異なる値となっても、その和がシールの４辺でほぼ同一であればよいことになる。これにより、最終的にシールの全ての辺で表示用電極およびダミー電極の重なり率がほぼ同一となればよいため、表示用電極、電極間ダミー電極および２重ダミー電極の重なり率を全て均一にする必要がなくなる。したがって、液晶表示装置の電極の設計を容易にし、量産性を向上させることができるという効果を奏する。
【０１８３】
請求項６の発明の液晶表示装置は、以上のように、請求項１ないし５の何れかの構成に加えて、上記重なり率は、対向する電極の重なり部分のピッチに対する線幅の割合であるという構成である。
【０１８４】
それゆえ、請求項１ないし５の何れかの構成による効果に加えて、重なり率は、表示用電極およびダミー電極の形成ピッチに対する電極の線幅の割合であることで、実際に表示用電極およびダミー電極を基板上に形成するときの設計を容易にすることができるという効果を奏する。
【０１８５】
請求項７の発明の液晶表示装置は、以上のように、請求項１ないし６の何れかの構成に加えて、上記液晶表示装置の表示用電極およびダミー電極は、シール上の４辺に介在し、このシール上での上記電極が専有する割合を示す介在率が４辺でほぼ同じになるように形成されている構成である。
【０１８６】
それゆえ、請求項１ないし６の何れかの構成による効果に加えて、シール上での表示用電極およびダミー電極が専有する割合を示す介在率の４辺でのバラツキの絶対値が所定値以下となるように形成されることで、シール内スペーサのガラスビーズが、表示用電極とダミー電極とに挟持される部分、表示用電極またはダミー電極のみが存在する部分で挟持される部分、および上記の何れの電極も存在しない部分で挟持される部分の専有する割合の４辺でのバラツキの絶対値が所定値以下となり、シールの厚みを４辺でほぼ同一にすることができる。これにより、表示エリアのシール近傍の４辺での濃度ムラを低減することができるので、表示品位を向上させることができるという効果を奏する。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る液晶表示装置の概略構成図である。
【図２】図１に示す液晶表示装置に設けられた走査電極引回し部の要部拡大図である。
【図３】図２に示す走査電極引回し部のＡ−Ａ線矢視断面図である。
【図４】図１に示す液晶表示装置に設けられた信号電極引回し部の要部拡大図である。
【図５】図４に示す信号電極引回し部のＢ−Ｂ線矢視断面図である。
【図６】図１に示す液晶表示装置に設けられた液晶封入口側電極部の要部拡大図である。
【図７】図６に示す液晶封入口側電極部のＣ−Ｃ線矢視断面図である。
【図８】図２に示す走査電極引回し部の中央付近の概略構成図である。
【図９】図２に示す走査電極引回し部の他の構成を示す概略構成図である。
【図１０】図１に示す液晶表示装置の概略断面図である。
【図１１】図１に示す液晶表示装置に設けられたカラーフィルタ層と信号電極および走査電極との関係を示す説明図である。
【図１２】重なり率の説明図である。
【図１３】本発明の他の実施の形態に係る液晶表示装置の概略構成図である。
【図１４】図１３に示す液晶表示装置に設けられた走査電極引回し部の要部拡大図である。
【図１５】図１４に示す走査電極引回し部のＤ−Ｄ線矢視断面図である。
【図１６】図１３に示す液晶表示装置に設けられた信号電極引回し部の要部拡大図である。
【図１７】図１６に示す信号電極引回し部のＥ−Ｅ線矢視断面図である。
【図１８】図１３に示す液晶表示装置に設けられた液晶封入口側電極部の要部拡大図である。
【図１９】図１８に示す液晶封入口側電極部のＦ−Ｆ線矢視断面図である。
【図２０】本発明のさらに他の実施の形態に係る液晶表示装置の概略構成図である。
【図２１】図２０に示す液晶表示装置に設けられた走査電極引回し部の要部拡大図である。
【図２２】図２１に示す走査電極引回し部のＧ−Ｇ線矢視断面図である。
【図２３】図２０に示す液晶表示装置に設けられた信号電極引回し部の要部拡大図である。
【図２４】図２０に示す液晶表示装置に設けられた液晶封入口側電極部の要部拡大図である。
【図２５】図１に示す液晶表示装置での濃度ムラを比較するための説明図である。
【図２６】図２５に示す説明図に基づいて測定した結果を示すグラフである。
【図２７】図２５に示す説明図に基づいて測定した結果を示すグラフである。
【図２８】従来の液晶表示装置の概略断面図である。
【図２９】従来の液晶表示装置の概略構成図である。
【図３０】従来の液晶表示装置の概略構成図である。
【図３１】従来の液晶表示装置の概略構成図である。
【図３２】従来の液晶表示装置の概略構成図である。
【図３３】従来の液晶表示装置におけるシール部分における概略断面図である。
【符号の説明】
１ 信号電極基板（基板）
２ 走査電極基板（基板）
３ 信号電極
４ 走査電極
５ シール
６ シール内スペーサ
７ 絶縁膜
８ 配向膜
９ 液晶層
１０ セル内スペーサ
１１ オーバーコート層
１２ カラーフィルタ層
１３ ブラックマトリックス
１４ 液晶封入口
１５ 信号電極引回し部
１６ 走査電極引回し部
１７ 液晶封入口側電極部
１８ 接続端子
１９ 引回し電極（表示用電極）
２０ 電極間ダミー電極（ダミー電極）
２１ ２重ダミー電極（ダミー電極）
２２ 接続端子
２３ 引回し電極（表示用電極）
２４ ２重ダミー電極（ダミー電極）
２５ 延設電極（ダミー電極）
２６ ２重ダミー電極（ダミー電極）
３１ 信号電極引回し部
３２ 走査電極引回し部
３３ 液晶封入口側電極部
３４ ２重ダミー電極（ダミー電極）
３５ ２重ダミー電極（ダミー電極）
３６ ２重ダミー電極（ダミー電極）
４１ 信号電極引回し部
４２ 走査電極引回し部
４３ 液晶封入口側電極部
４４ ２重ダミー電極（ダミー電極）
４５ ２重ダミー電極（ダミー電極）
４６ ２重ダミー電極（ダミー電極）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device having a dummy electrode for making the thickness of a liquid crystal layer uniform.
[0002]
[Prior art]
In recent years, liquid crystal display devices have been widely used as display devices using liquid crystal as a display medium. For example, as shown in FIG. 28, the liquid crystal display device includes an upper glass 101 provided with a plurality of display upper electrodes 103 on the surface and a lower glass provided with a plurality of display lower electrodes 104 on the surface. The glass 102 and the glass 105 are arranged to face each other through the seal 105 so that the electrodes are orthogonal to each other, and liquid crystal is sealed in a space surrounded by the glass 101 and 102 and the seal 105 to form the liquid crystal layer 106. It has a liquid crystal cell.
[0003]
In the liquid crystal display device having the above-described configuration, the opposite side of the display lower electrodes 104 to the side where the terminal portions 104 a are formed is disposed inside the seal 105. For this reason, the distance d2 between the formation portion of the upper display electrodes 103 of the upper glass 101 and the formation portion of the lower display electrodes 104 of the lower glass 102 and the upper electrode 103 for display and the lower electrode 104 for display are formed. The distance d1 between the unformed portions of the glass 101 and 102 is different. That is, a difference in thickness occurs in the liquid crystal layer 106 between the electrode-formed portion and the non-formed portion of the glass 101 or 102 of the liquid crystal display device.
[0004]
Thus, when a difference in thickness occurs in the liquid crystal layer 106, the color of the display screen when no voltage is applied to the display upper electrode 103 and the display lower electrode 104 changes depending on the thickness of the liquid crystal layer 106. Therefore, color unevenness occurs on the display screen.
[0005]
In recent years, it has been strongly desired to improve display quality in liquid crystal display devices, particularly STN (Super Twisted Nematic) type color liquid crystal display devices. In particular, in an STN type color liquid crystal display device, it is desired to improve color unevenness in the vicinity of a seal seen in a halftone of image display.
[0006]
Various techniques have been proposed as techniques for reducing the color unevenness near the seal on such a display screen. For example, Japanese Patent Application Laid-Open No. 62-229234 prevents a difference in the thickness of the liquid crystal layer by forming a dummy electrode having the same thickness as the display electrode on a substrate on which no display electrode is formed, A “liquid crystal display device” that reduces color unevenness on a display screen is disclosed.
[0007]
In Japanese Utility Model Laid-Open No. 1-85779, as shown in FIG. 29, the pattern width of the terminal lead portion 113a of the segment electrode 113 formed on the segment electrode substrate 111 is the terminal portion of the common electrode substrate 112 (not shown). “Liquid crystal display panel” is disclosed in which the dummy pattern 114 is formed between the patterns of the portion where the pattern width of the terminal lead-out portion 113a is narrower as it gets farther away from.
[0008]
Further, as shown in FIG. 30, in Japanese Patent Application Laid-Open No. 6-51332, an upper dummy electrode 126 is formed in a portion where the signal electrode 123 of the upper glass 121 on the seal 125 at the periphery of the screen is absent, and the lower glass A “liquid crystal display device” is disclosed in which a lower dummy electrode 127 is formed in a portion where the scan electrode 124 is not provided.
[0009]
In addition, as shown in FIG. 31, Japanese Patent Laid-Open No. 3-121524 includes an upper electrode substrate 131 having a segment electrode 133 formed on the surface and a lower electrode substrate 132 having a common electrode 134 formed on the surface. The “liquid crystal display element” is formed by sealing liquid crystal from the sealing port 137 which is disposed through the sealing material 135 so as to face the electrode forming surfaces and is formed on the sealing port side 136 of each of the substrates 131 and 132. It is disclosed. In this liquid crystal display element, a dummy electrode 138 is formed in a portion corresponding to the sealing material 135 on the liquid crystal inlet side 136.
[0010]
In any of the above publications, the dummy pattern 114, the upper and lower dummy electrodes 126 and 127, the dummy electrode 138, and the like are formed in a portion that will affect the thickness of the liquid crystal layer of the display screen. The difference in the thickness of the liquid crystal layer between the display area and its peripheral part is reduced, and the color unevenness near the seal of the display screen is improved.
[0011]
Thus, in order to improve the color unevenness near the seal of the display screen, a liquid crystal display device to which the technology in each of the above publications is applied has been commercialized. As such a liquid crystal display device, for example, as shown in FIG. 32, a signal electrode substrate 141 and a scanning electrode substrate 142 are disposed to face each other via a seal 145, and a signal in the vicinity of the seal 145 disposed in the display area is displayed. The signal electrode routing portion 143 of the electrode (not shown) and the scanning electrode routing portion 144 of the scanning electrode (not shown) are divided into a plurality of blocks so as to correspond to the connection terminals with the external circuit. is there.
[0012]
In the case of the liquid crystal display device having the above-described configuration, each of the electrode lead portions 143 and 144 is designed such that the arrangement density of the electrodes on the connection terminal side of the external circuit is higher than the arrangement density of the electrodes on the display area side. Yes. And based on the design of this electrode, the dummy electrode between the electrodes of the electrode routing portions 143 and 144, or the double dummy electrode so as to face each of these electrode routing portions 143 and 144, Color unevenness near the seal 145 in the display area is improved.
[0013]
[Problems to be solved by the invention]
However, in the liquid crystal display device shown in FIG. 32, the electrode lead-out portions 143 and 144 are designed so that the design tolerance and the resistance value of the display electrode (signal electrode / scanning electrode) are uniform over the entire side. Based on this design, a dummy electrode (inter-electrode dummy electrode, double dummy electrode) is designed. For this reason, the ratio of the display electrode and the dummy electrode to the seal 145 portion, that is, the interposition rate, is different on each side. Furthermore, as shown in FIG. 12, which is an explanatory diagram of the present invention, the ratio of the area of the overlapping region S of the display electrode and the dummy electrode facing each other to the seal 5, that is, the overlapping rate, was different on each side.
[0014]
In particular, as shown in FIG. 10 which is an explanatory view of the present invention, in the case of a color liquid crystal display device using the color filter layer 12, as shown in FIG. 11 which is an explanatory view of the present invention, one display electrode is used. The width x of a certain signal electrode 3 is about 1/3 of the width (3x + 2y) of the scanning electrode 4 which is the other display electrode. Note that x represents the line width of the signal electrode 3, and y represents the line width of the black matrix 13.
[0015]
Therefore, in the case of the liquid crystal display device shown in FIG. 32, a terminal part I composed of scanning electrode lead parts 144 on the scanning electrode side and a terminal part II composed of signal electrode lead parts 143 on the signal electrode side. In this case, the interposition rate and the overlap rate at the seal 145 portion of the display electrode and the dummy electrode are greatly different.
[0016]
Furthermore, in the case of the liquid crystal display device shown in FIG. 32, a liquid crystal sealing port side electrode portion 147 is formed on the side of the liquid crystal sealing port 146 side. In the liquid crystal sealing port side electrode portion 147, the scanning electrode on the scanning electrode substrate 142 is directly extended to the seal 145 portion, and a double dummy electrode is formed on the seal 145 portion on the signal electrode substrate 141 which is a counter substrate. Since they are formed, the interposition rate and the overlap rate of the display electrode and the dummy electrode are greatly different from the above-described terminal portion I and terminal portion II.
[0017]
By the way, generally, glass beads for adjusting the thickness are included in the seal. Unlike the plastic spacer used to determine the thickness of the liquid crystal layer in the display area, the glass beads are hard and do not deform even when pressure is applied by bonding. Therefore, the thickness of the liquid crystal layer in the vicinity of the seal can be adjusted by adjusting the diameter of the glass beads included in the seal.
[0018]
Specifically, FIG. 3 As shown, the glass beads 156 of the spacer in the seal included in the seal 155 sandwiched between the display substrates 151 and 152 are the glass beads 156a sandwiched between the display electrode 153 and the dummy electrode 154, and the display electrode. The glass beads 156b are sandwiched between portions where only 153 is present, and the glass beads 156c are sandwiched between portions where none of the electrodes 153 and 154 are present. Note that FIG. 3 Although not shown in the figure, the glass beads 156b may be sandwiched between portions where only the dummy electrodes 154 exist.
[0019]
When viewed from the entire side, the glass beads 156a sandwiched between the display electrode 153 and the dummy electrode 154 serve as pillars, and therefore the thickness of the seal 155 is substantially determined by the diameter of the glass beads 156a. It will be. However, when viewed locally, the thickness of the seal 155 is d3, d2, and d1 (d3>d2> d1) in the respective regions where the glass beads 156a, 156b, and 156c exist. That is, at this time, the glass beads 156b and 156c are in a floating state.
[0020]
From the above, as in the conventional liquid crystal display device shown in FIG. 32, if the overlapping ratios of the display electrode and the dummy electrode facing each other of the seal 145 are different, the three types of diameters existing in the seal 145 are present. Since the number ratio of the glass beads is different on each side, the thickness of the seal 145 is different on the four sides. Therefore, the thickness of the liquid crystal layer is different in the display area near the seal 145, and as a result, color unevenness occurs on the four sides, resulting in a problem that the display quality is lowered.
[0021]
Further, if the thicknesses on the four sides of the seal 145 are different as described above, it is difficult to adjust the thickness between the center of the display area and the vicinity of the seal 145. That is, the thickness of the seal 145 cannot be made uniform on all four sides only by adjusting the diameter of the glass beads contained in the seal 145. Accordingly, there is a difference in brightness between the central portion of the display area and the vicinity of the four sides of the seal 145, which causes a problem that display quality is lowered.
[0022]
The present invention has been made in view of the above-described problems, and an object of the present invention is to make the brightness between the central portion of the display area and the vicinity of the seal uniform by making the thickness of the seal uniform on four sides. It is an object of the present invention to provide a liquid crystal display device having excellent display quality with uniform brightness over the entire display area.
[0023]
[Means for Solving the Problems]
In order to solve the above problem, the liquid crystal display device according to claim 1 includes a pair of substrates on which a plurality of display electrodes are formed, and a spacer serving as a support column. A seal for connecting electrodes facing each other, a liquid crystal layer formed by enclosing liquid crystal in a space surrounded by the pair of substrates and the seal, and a uniform thickness of the liquid crystal layer in the display area And the opposing display electrodes formed on the pair of substrates have different line widths and electrode pitches, and the display electrodes and the dummy electrodes are formed on the pair of substrates. Is interposed on the four sides of the seal In addition, the display electrode has an extended electrode extending beyond the seal portion from the scanning electrode, and an overlap ratio indicating an occupation ratio in the seal in an area of an area where electrodes facing each other overlap each other On the seal above To be almost the same on all four sides The line width of the extended electrode and the dummy electrode is narrower than the line width of the scan electrode. It is characterized by being formed.
[0024]
According to the above configuration, the overlap ratio indicating the degree of overlap between the display electrode and the dummy electrode facing each other on the seal The variation is almost the same on the four sides of the seal (the variation on the four sides of the overlap ratio is less than the predetermined value). As a result, the abundance of the glass beads that determine the thickness of the seal is substantially constant by serving as a support in the seal, and the thickness of the seal can be made substantially equal on the four sides. . Thereby, density unevenness on the four sides in the vicinity of the seal in the display area can be reduced, so that display quality can be improved.
[0025]
The predetermined value may be set within a range in which it can be recognized that the density unevenness on the four sides near the seal can be reduced when the user actually looks at the display area.
[0026]
In order to solve the above-described problem, the liquid crystal display device according to claim 2 has an electrode lead portion of the display electrode from the display area as a connection terminal with an external circuit in addition to the configuration of claim 1. It is divided into a plurality of blocks so as to correspond to each other, and the electrodes of the electrode routing portions of each block are formed so that the arrangement density is higher on the connection terminal side with the external circuit than on the display area side. Of the display electrodes and dummy electrodes formed on the pair of substrates, the electrodes facing each other on the seal in the region formed in parallel with the display electrodes in the display area and the connection terminals with the external circuit Indicates the occupancy ratio of the overlapping area in the seal Overlap rate and the opposing electrode on the seal outside the above region Indicates the occupancy ratio of the overlapping area in the seal Overlap rate Toga The four sides are substantially the same.
[0027]
According to said structure, in addition to the effect | action of Claim 1, the electrode routing part of the electrode for a display is divided | segmented into a some block so that it may correspond to a connection terminal with an external circuit, and on the display area side, Designed so that the placement density of the display routing electrodes on the connection terminal side with the external circuit is higher than the placement density of the display routing electrodes, for example, to keep the wiring resistance at a predetermined value. Even when the electrode width of the electrode lead-out portion connecting the display electrode in the effective display area and the connection terminal of the external circuit is different from the region parallel to the display electrode in the effective display area and the region not parallel to the electrode The electrode for connecting the display electrode in the effective display area and the connection terminal of the external circuit, and the display electrode facing the region parallel to the non-parallel region to the display electrode in the effective display area, and Variation in overlap ratio of dummy electrodes Since the display electrode and the dummy electrode are formed so that the absolute value is less than or equal to the predetermined value, the region parallel to the display electrode in the effective display area in one block of the electrode routing portion is not parallel to the region Density unevenness due to the difference in the occupancy ratios of the four sides can be reduced, and density unevenness due to the difference in the overlapping ratios of the four sides can be reduced.
[0028]
The predetermined value may be set within a range where it can be recognized that the density unevenness on the four sides in the vicinity of the seal can be reduced when the user actually looks at the display area.
[0029]
In order to solve the above-mentioned problems, the liquid crystal display device according to claim 3 is characterized in that, in addition to the configuration of claim 1 or 2, the dummy electrode includes an inter-electrode dummy electrode formed between display electrodes, and these displays. A double dummy electrode formed on the opposite substrate of the substrate on which the electrode for electrodes and the interelectrode dummy electrode are formed, wherein the double dummy electrode is On board The display electrode and the interelectrode dummy electrode are formed to face each other.
[0030]
According to said structure, in addition to the effect | action of Claim 1 or 2, the seal | sticker pinched | interposed into a board | substrate is a seal | sticker corresponding to the part which has an electrode on both two upper and lower boards, and an electrode on both upper and lower boards. It can be divided into a seal corresponding to a non-existing part. That is, it is possible to eliminate a seal portion having electrodes only on one substrate. Thereby, the thickness of the seal can be easily uniformed by the thickness adjusting member such as the glass beads of the spacer in the seal included in the seal. In addition, since the display electrode and the dummy electrode facing each other on the seal are formed so that the absolute value of the variation in the overlap ratio on the four sides is not more than a predetermined value, the thickness of the seal is almost the same on the four sides. Easy to do.
[0031]
In order to solve the above-mentioned problem, the liquid crystal display device according to a fourth aspect of the invention includes the double dummy electrode, in addition to the structure of the third aspect, wherein the double dummy electrode has lines of display electrodes and inter-electrode dummy electrodes facing each other. width And different It is characterized by being formed.
[0032]
According to said structure, in addition to the effect | action of Claim 3, as for the double dummy one electrode, the line width of the electrode for a display which opposes, and the line width of the electrode between electrode dummy electrodes differ only by predetermined value, That is, by being formed to be narrow or wide, it is possible to adjust the overlapping rate while maintaining the wiring resistance value of the display electrode at a predetermined value, and furthermore, facing each other when the substrates are bonded together. The displacement between the electrodes can be absorbed.
[0033]
In order to solve the above-described problem, the liquid crystal display device according to claim 5 has the overlap ratio in addition to the configuration according to claim 3 or 4. opposite The overlapping ratio of the display electrode and the double dummy electrode; opposite Overlap ratio of inter-electrode dummy electrode and double dummy electrode When It is characterized by the sum of
[0034]
According to said structure, in addition to the effect of Claim 3 or 4, the overlapping rate of the opposing display electrode and dummy electrode is the overlapping rate of the opposing display electrode and double dummy electrode, and the inter-electrode dummy electrode And the overlap rate of the double dummy electrode, the overlap rate of the display electrode and the double dummy electrode and the overlap rate of the inter-electrode dummy electrode and the double dummy electrode may be different values. It is sufficient that the sum is substantially the same on the four sides of the seal. As a result, it is only necessary that the overlapping ratio of the display electrode and the dummy electrode is finally substantially the same on all sides of the seal, so that the overlapping ratio of the display electrode, the inter-electrode dummy electrode and the double dummy electrode is all uniform. There is no need to do it. Therefore, the design of the electrode of the liquid crystal display device can be facilitated and the mass productivity can be improved.
[0035]
In order to solve the above-described problem, a liquid crystal display device according to a sixth aspect of the present invention includes the above-described configuration according to any one of the first to fifth aspects. Note Nari rate is opposite Ruden It is characterized by the ratio of the line width to the pitch of the overlapping part of the poles.
[0036]
According to said structure, in addition to the effect | action of any one of Claim 1 thru | or 5, an overlapping rate is a ratio of the line | wire line width of the electrode with respect to the formation pitch of a display electrode and a dummy electrode, and actually for display The design when the electrode and the dummy electrode are formed on the substrate can be facilitated.
[0037]
In order to solve the above-described problem, the liquid crystal display device according to claim 7 has four sides on the seal in addition to the structure according to any one of claims 1 to 6. Intervening that shows the ratio of the above electrode on this seal Rate is It is characterized by being formed so as to be substantially the same on four sides.
[0038]
According to said structure, in addition to the effect | action in any one of Claims 1 thru | or 6, the absolute value of the dispersion | variation in four sides of the interposition rate which shows the ratio which the display electrode and dummy electrode on a seal | sticker occupy is predetermined. The glass beads of the spacer in the seal are sandwiched between the display electrode and the dummy electrode, the portion sandwiched only in the portion where only the display electrode or the dummy electrode exists, In addition, the absolute value of the variation at the four sides of the portion occupied by the portion sandwiched by the portions where none of the electrodes are present is less than a predetermined value, and the thickness of the seal can be made substantially the same at the four sides. Thereby, density unevenness on the four sides in the vicinity of the seal in the display area can be reduced, so that display quality can be improved.
[0039]
The predetermined value may be set within a range in which it can be recognized that the density unevenness on the four sides near the seal can be reduced when the user actually looks at the display area.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
An embodiment of the present invention will be described with reference to FIGS. 1 to 12 as follows. Note that in this embodiment, a case where the present invention is applied to an STN color liquid crystal display device as a liquid crystal display device will be described.
[0041]
As shown in FIG. 10, the liquid crystal display device according to the present embodiment is a sealed structure in which a pair of insulating substrates such as glass (a signal electrode substrate 1 and a scanning electrode substrate 2) are opposed to each other and bonded together at the periphery. The liquid crystal cell includes a seal 5 as a stop member, and a liquid crystal layer 9 formed by sealing liquid crystal in a space surrounded by the signal electrode substrate 1, the scan electrode substrate 2, and the seal 5.
[0042]
The signal electrode substrate 1 is provided with a signal electrode 3 made of a transparent electrode such as ITO (Indium Tin Oxide) in a stripe shape on the opposite surface side of the scanning electrode substrate 2, and further an insulating film so as to cover the signal electrode 3 7 is formed, and an alignment film 8 for aligning liquid crystal molecules of the liquid crystal layer 9 is formed.
[0043]
The scanning electrode substrate 2 is formed by sequentially laminating a color filter layer 12 and an overcoat layer 11 made of a transparent resin on the opposite surface side of the signal electrode substrate 1. On the overcoat layer 11, the signal electrode 3 and Scan electrodes 4 made of transparent electrodes such as ITO are provided in stripes so as to be orthogonal to each other, and an alignment film 8 for aligning liquid crystal molecules of the liquid crystal layer 9 is formed so as to cover the scan electrodes 4. .
[0044]
The seal 5 includes a substantially spherical spacer 6 in a seal made of a hard member such as glass beads, and the thickness of the seal 5 is determined by the diameter of the spacer 6 in the seal.
[0045]
Further, the liquid crystal layer 9 includes an in-cell spacer 10 made of a substantially spherical member such as a resin softer than the glass beads of the in-seal spacer 6, and the liquid crystal layer 9 depends on the diameter of the in-cell spacer 10. The thickness is determined.
[0046]
Therefore, the thickness of the liquid crystal layer 9 of the liquid crystal cell having the above configuration can be determined by adjusting the diameter of the in-cell spacer 10 in the liquid crystal layer 9 and the diameter of the in-seal spacer 6 in the seal 5.
[0047]
Further, as shown in FIG. 11, the color filter layer 12 has a striped RGB pattern, and each R, G, B filter is surrounded by a black matrix 13. Each of these R, G, and B corresponds to one picture element, and corresponds to one pixel in the display area by a filter that corresponds to three adjacent R, G, and B picture elements. . In the case of the color filter layer 12, if the width of the signal electrode 3 is x and the width of the black matrix 13 is y, the width of the scanning electrode 4 is 3x + 2y, and the width of the signal electrode 3 is about 1 of the width of the scanning electrode 4. / 3.
[0048]
As shown in FIG. 1, the liquid crystal display device having the liquid crystal cell having the above-described configuration has a central area as a display area for image display. For convenience of explanation, in FIG. 1, the signal electrode 3, the scanning electrode 4, the pixel electrode, and the like in the display area are omitted.
[0049]
The seal 5 portion on each side of the outer peripheral portion of the display area has a terminal portion I for connection with an external circuit (not shown) such as a scanning electrode drive circuit, and an external circuit (not shown) such as a signal electrode drive circuit. Terminal portion II and a liquid crystal sealing port 14 are formed.
[0050]
The terminal portion I is composed of a plurality of scanning electrode routing portions 16 formed by routing the scanning electrodes 4 (FIG. 10) of the scanning electrode substrate 2 in the display area for every predetermined number. That is, the terminal part I is formed with a plurality of blocks of lead electrodes for the scanning electrodes. The details of the configuration of the scanning electrode routing unit 16 will be described later.
[0051]
The terminal portion II is composed of a plurality of signal electrode routing portions 15 formed by routing the signal electrodes 3 (FIG. 10) of the signal electrode substrate 1 in the display area for every predetermined number. The details of the configuration of the signal electrode routing unit 15 will be described later.
[0052]
Further, in the portion of the seal 5 where the liquid crystal sealing opening 14 is formed, the scanning electrode 4 from the display area extends to the seal 5, and constitutes the liquid crystal sealing opening side electrode portion 17. The details of the configuration of the liquid crystal sealing port side electrode portion 17 will be described later.
[0053]
Here, the configuration of the scanning electrode routing portion 16, the signal electrode routing portion 15, and the liquid crystal sealing port side electrode portion 17 existing in the seal 5 portion on each side of the outer peripheral portion of the display area will be described.
[0054]
First, the scanning electrode routing unit 16 will be described below with reference to FIGS. 2, 3, and 8. As shown in FIG. 2, the scanning electrode routing unit 16 has routing electrodes 19 for electrically connecting the scanning electrodes 4 and connection terminals 18 for connection to external circuits.
[0055]
The connection terminals 18 are arranged at a density corresponding to TAB (Tape Automated Bonding) on the external circuit side. In general, the line width of the connection terminal 18 is narrower than that of the scanning electrode 4. For this reason, the routing electrode 19 is bent and connected from the scanning electrode 4 toward the connection terminal 18.
[0056]
The routing electrode 19 includes a linear portion 19a on the connection terminal 18 side and an inclined portion 19b on the scanning electrode 4 side. However, as shown in FIG. 8, the routing electrode 19 is formed of only a straight linear portion 19 a from the connection terminal 18 to the scanning electrode 4 at the center of the scanning electrode routing portion 16. The routing electrode 19 is formed such that the proportion of the straight portion 19a decreases and the proportion of the inclined portion 19b increases as the distance from the center portion increases. In addition, the lead electrode 19 is formed so that the line width of the straight portion 19b is wider than the line width of the inclined portion 19a in order to make the resistance value of the lead electrodes 19 in the scan electrode lead portion 16 uniform. Has been.
[0057]
Thus, when the line width of the straight portion 19b of the routing electrode 19 is formed so as to be larger than the line width of the inclined portion 19a, a space is created between the routing electrodes 19 in the straight portion 19a portion. If a space is generated in this way, the thickness of the seal 5 differs between the portion where the electrode 19 is present and the portion where the electrode 19 is not present, and the thickness of the seal 5 becomes non-uniform.
[0058]
Accordingly, in the space provided between the routing electrodes 19 as described above, an electrode having the same thickness as the routing electrode 19 is provided as a dummy electrode in order to make the thickness of the seal 5 uniform. . Since this dummy electrode is provided between the routing electrodes 19, it is referred to as an interelectrode dummy electrode 20. The interelectrode dummy electrode 20 is formed simultaneously with the lead-out electrode 19 when the scan electrode 4 is formed on the scan electrode substrate 2.
[0059]
Further, as shown in FIG. 3, the scanning electrode routing unit 16 has a signal electrode substrate 1, which is a counter substrate of the scanning electrode substrate 2, and a double electrode opposing the routing electrodes 19... And the inter-electrode dummy electrodes 20. Dummy electrodes 21 are formed. The double dummy electrode 21 has the same line width and thickness as the routing electrode 19 and the inter-electrode dummy electrode 20. Therefore, in FIG. 2, the double dummy electrode 21 is omitted. The double dummy electrode 21 is formed simultaneously with the signal electrode 3 on the signal electrode substrate 1.
[0060]
The design items such as the line width of the routing electrode 19, the inter-electrode dummy electrode 20, and the double dummy electrode 21, the distance between the electrodes, and the like will be described in detail later in Example 1.
[0061]
In the following description, electrodes related to display such as the lead-out electrode 19 existing on the seal 5 are collectively referred to as display electrodes, and the inter-electrode dummy electrode 20 and the double dummy electrode 21 are collectively referred to as dummy electrodes.
[0062]
Next, the signal electrode routing unit 15 will be described below with reference to FIGS. 4 and 5. As shown in FIG. 4, the signal electrode routing unit 15 includes a routing electrode 23 that electrically connects the signal electrode 3 and a connection terminal 22 for connection to an external circuit.
[0063]
The connection terminals 22 are arranged at a density corresponding to TAB on the external circuit side. In general, the line width of the connection terminal 22 is narrower than that of the signal electrode 3. For this reason, the routing electrode 23 is bent and connected from the signal electrode 3 toward the connection terminal 22.
[0064]
The routing electrode 23 includes a straight line portion 23a on the connection terminal 22 side and an inclined portion 23b on the signal electrode 3 side. In this case, the ratio of the linear portion 23a and the inclined portion 23b in the routing electrode 23 changes as the distance from the center portion increases as in the case of the scanning electrode routing portion 16 described above. Moreover, in the routing electrode 23, the line width of the inclined portion 23b is slightly wider than the line width of the straight portion 23a so that the resistance value between the routing electrodes 23 in the signal electrode routing portion 15 is uniform. It is formed to become.
[0065]
In the case of the routing electrode 23, as described above, the line width of the signal electrode 3 is about 1/3 of the line width of the scanning electrode 4 (see FIG. 11). The distance between the lead electrodes 23 is also narrowed. Therefore, a dummy electrode formed between the routing electrodes 19 in the scanning electrode routing portion 16 is not formed between the routing electrodes 23.
[0066]
Further, in the signal electrode routing section 15, as shown in FIG. 5, double dummy electrodes 24,... Facing the routing electrodes 23, are formed on the scanning electrode substrate 2, which is a counter substrate of the signal electrode substrate 1. ing. The double dummy electrode 24 has the same line width and thickness as the routing electrode 23. Therefore, in FIG. 4, the double dummy electrode 24 is omitted. The double dummy electrode 24 is formed simultaneously with the scan electrode 4 on the scan electrode substrate 2.
[0067]
The design matters such as the line width of the routing electrode 23 and the double dummy electrode 24 and the distance between the electrodes will be described in detail later in the first embodiment.
[0068]
Next, the liquid crystal sealing port side electrode portion 17 will be described below with reference to FIGS. 6 and 7. As shown in FIG. 6, the liquid crystal sealing port side electrode portion 17 has extended electrodes 25 extending from the scanning electrode 4 beyond the seal 5 portion.
[0069]
The extended electrode 25 is formed so as to have a line width narrower than the line width of the scanning electrode 4. This takes into account the electrode interposition rate and the overlap rate in the seal 5 described later. The interposition rate and the overlap rate will be described in detail later.
[0070]
In addition, in the liquid crystal sealing port side electrode portion 17, as shown in FIG. 7, double dummy electrodes 26 that are opposed to the extended electrodes 25 are formed on the signal electrode substrate 1 that is the opposite substrate of the scanning electrode substrate 2. Has been. The double dummy electrode 26 has the same line width and thickness as the extended electrode 25. Therefore, in FIG. 6, the double dummy electrode 26 is omitted. The double dummy electrode 26 is formed simultaneously with the signal electrode 3 on the signal electrode substrate 1.
[0071]
The design items such as the line width of the extended electrode 25 and the double dummy electrode 26 and the distance between the electrodes will be described in detail later in Example 1.
[0072]
In the liquid crystal display device having the above-described configuration, the scanning electrode routing unit 16, the signal electrode routing unit 15, and the liquid crystal filling port side electrode unit 17 are the routing electrode 19 and the routing electrode 23 as display electrodes. And the interposition ratios on the four sides of the display area in the seal 5 between the extended electrode 25 and the dummy electrode 20, the dummy electrode 20, the double dummy electrode 21, the double dummy electrode 24, and the double dummy electrode 26 as dummy electrodes The absolute value of the variation in the overlap ratio is designed to be equal to or less than a predetermined value. Here, the interposition ratio refers to the ratio of the display electrode and the dummy electrode to the seal 5. Further, the overlapping ratio means the ratio of the area of the overlapping region S of two opposing electrodes to the seal 5 as shown in FIG.
[0073]
In addition, dummy electrodes are provided on the signal electrode substrate 1 and the scan electrode substrate 2 in the seal 5 between the scan electrode routing portions 16 of the terminal portion I, respectively. The interposition rate and the overlap rate of the dummy electrode are also set to predetermined values in the same manner as the interposition rate and the overlap rate in the seal 5 of the scanning electrode routing portion 16. Similarly, dummy electrodes are provided on the signal electrode substrate 1 and the scan electrode substrate 2 in the seal 5 between the signal electrode routing portions 15 of the terminal portion II. The intervention rate and the overlap rate of the dummy electrode are also set to predetermined values, similar to the intervention rate and the overlap rate in the seal 5 of the signal electrode routing portion 15.
[0074]
In this way, by designing the display electrode and the dummy electrode so that the variation in the interposition rate and the overlapping rate of the display electrode and the dummy electrode on the four sides of the seal 5 is not more than a predetermined value, The thickness of the liquid crystal layer 9 can be made substantially uniform on the four sides. Thereby, density unevenness in the vicinity of the seal 5 can be eliminated, so that display quality can be improved.
[0075]
Here, the predetermined value may be set within a range in which it can be recognized that the density unevenness on the four sides in the vicinity of the seal 5 can be reduced when the user actually looks at the display area.
[0076]
Further, as shown in FIG. 10, the thickness of the seal 5 is adjusted by the in-seal spacer 6, so that the thickness of the liquid crystal layer 9 can be adjusted only by changing the diameter of the in-seal spacer 6. Thereby, the thickness of the central portion of the liquid crystal layer 9 in the display area and the liquid crystal layer 9 in the vicinity of the seal 5 can be made uniform on the four sides, thereby eliminating density unevenness between the central portion of the display area and the vicinity of the seal 5. Display quality can be further improved.
[0077]
Note that the liquid crystal display device having the above configuration includes the stripe-shaped color filter layer 12, and display electrodes are formed in accordance with the color filter layer 12.
[0078]
Accordingly, the display electrode is formed in accordance with the color filter layer 12, so that, for example, the display electrode is formed on the scanning electrode substrate 2 and the signal electrode substrate 1 is formed on the signal electrode substrate 1. The electrode 3 is formed such that the electrode pitch of the signal electrode 3 is 1/3 of the electrode pitch of the scanning electrode 4. As a result, the line width of the signal electrode 3 of the display electrodes is about 1/3 of the line width of the scanning electrode 4, so that the display electrode and the dummy electrode on the seal 5 on which the signal electrode 3 is formed The overlapping rate differs from the overlapping rate of the display electrode and the dummy electrode on the seal 5 on which the scanning electrode 4 is formed.
[0079]
However, since the display electrode and the dummy electrode are formed so that the absolute value of the variation of the overlap ratio on the four sides of the seal 5 is not more than a predetermined value, density unevenness due to the difference of the overlap ratio is reduced. can do. Therefore, even in the liquid crystal display device having the stripe-shaped color filter layer 12, the difference in brightness can be reduced over the entire display area, so that the display quality can be improved.
[0080]
When the liquid crystal display device having the above configuration is an STN type liquid crystal display device, the change in characteristics with respect to the difference in cell thickness is large. For example, when the thickness of the liquid crystal layer changes by 0.05 μm, the difference in density appears uneven. .
[0081]
However, since the display electrode and the dummy electrode are formed so that the absolute value of the variation in the four sides of the seal 5 is less than or equal to the predetermined value, the density unevenness due to the difference in the overlap rate is reduced. Can do. Therefore, even in the STN type liquid crystal display device, the difference in brightness can be reduced over the entire display area, so that the display quality can be improved.
[0082]
In the liquid crystal cell of the liquid crystal display device having the above-described configuration, the interelectrode dummy electrode 20 of the scan electrode lead-out portion 16 is made of the same material (ITO) as the lead-out electrode 19 as shown in FIG. If it is formed so as not to be electrically connected to the lead-out electrode 19 above, there is a possibility that extra charges may be accumulated in the interelectrode dummy electrode 20. When charges are accumulated in the interelectrode dummy electrode 20 in this way, an unnecessary voltage is applied to the routing electrode 19. That is, an unnecessary voltage is applied to the scan electrode 4 and the display quality may be deteriorated.
[0083]
For example, as shown in FIG. 9, the above-described problem can be solved by electrically connecting a connection portion 20 a that is a part of the interelectrode dummy electrode 20 to the routing electrode 19. In this case, since unnecessary charges accumulated in the interelectrode dummy electrode 20 can be routed and released through the electrode 19, unnecessary voltage is not applied to the routed electrode 19, and deterioration of display quality is prevented. can do. However, when the interelectrode dummy electrode 20 is connected to the lead-out electrode 19, if the area of the connecting portion 20a is increased, the inter-electrode dummy electrode 20 may be electrically integrated with the lead-out electrode 19 and serve as a display electrode. There is. Therefore, the line width of the connecting portion 20a of the interelectrode dummy electrode 20 should be as narrow as possible.
[0084]
Here, a liquid crystal display device (hereinafter referred to as a unified product) in which the variation in the interposition rate and the overlap rate of display electrodes and dummy electrodes on the four sides of the seal 5 of the liquid crystal display device is set to a predetermined value or less, and the above interposition With reference to FIGS. 25 to 27, the following will describe the variation in brightness of the display area in a conventional liquid crystal display device (hereinafter referred to as a non-uniform product) that does not take into account variations in the rate and the overlap rate.
[0085]
The variation in brightness can be determined based on the result of measuring the transmittance ratio (average value reference) during gradation display.
[0086]
The average value as shown in FIG. 25 is a value obtained by measuring the average transmittance at the time of gradation display for each point plotted in the figure (dotted line in the figure), and the resolution of the display area of the liquid crystal display device is 800 in the horizontal direction. When the dot (X axis) and vertical 600 dots (Y axis) are used, the transmittance ratio (average value reference) at the time of gradation display is obtained for each dot, and the results shown in FIGS. 26 and 27 are obtained. It was. In FIG. 26 and FIG. 27, the unified product is indicated by a solid line, and the non-uniform product is indicated by a one-dot chain line.
[0087]
From FIG. 26 and FIG. 27, the unified product has a transmittance ratio close to the average value in the vicinity of 0,800 dots on the X axis and 0,600 dots on the Y axis, which are near the seal in the display area, compared to the non-uniform product. You can see that From this, it can be seen that the unified product has less variation in brightness between the central portion of the display area and the vicinity of the seal than the non-uniform product.
[0088]
[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0089]
As shown in FIG. 13, the liquid crystal display device according to the present embodiment includes a scanning electrode routing portion 16, a signal electrode routing portion 15, and a liquid crystal sealing port side electrode of the liquid crystal display device according to the first embodiment. Instead of the unit 17, a scanning electrode routing unit 32, a signal electrode routing unit 31, and a liquid crystal sealing port side electrode unit 33 are provided.
[0090]
As shown in FIGS. 14 and 15, the scanning electrode routing portion 32 has a line width of a double dummy electrode 34 formed on the signal electrode substrate 1 so as to face the routing electrode 19 and the interelectrode dummy electrode 20. However, the portion facing the routing electrode 19 is narrow by a predetermined value, and the portion facing the inter-electrode dummy electrode 20 is wide by a predetermined value.
[0091]
Further, as shown in FIGS. 16 and 17, the signal electrode routing portion 31 has a line width of the double dummy electrode 35 formed on the scanning electrode substrate 2 facing the routing electrode 23 so that the routing is performed. It is formed to be narrower by a predetermined value than the line width of the electrode 23.
[0092]
Further, as shown in FIG. 18 and FIG. 19, the liquid crystal sealing port side electrode portion 33 has a line width of the double dummy electrode 36 formed on the signal electrode substrate 1 so as to be opposed to the extended electrode 25. It is formed to be narrower by a predetermined value than the line width of the provided electrode 25.
[0093]
The difference between the present embodiment and the first embodiment is that the line width of the double dummy electrode is designed to be different from the line width of the opposing electrode. That is, the line widths of the double dummy electrodes 34, 35, 36 facing the lead electrode 19, the lead electrode 23, the extended electrode 25, and the inter-electrode dummy electrode 20 as display electrodes are set as described above. The line widths of the working electrode and the interelectrode dummy electrode 20 are made different.
[0094]
This is because the wiring resistance of the electrode routing portion, the interposition rate, and the overlap rate are set to values within a predetermined range. If the above-mentioned double dummy electrodes are made to differ from the line width of the electrodes facing each other by a predetermined value, the effect of providing the double dummy electrodes will not change even if the bonding of the upper and lower substrates is slightly deviated. In other words, the difference in line width causes a margin when the upper and lower substrates are bonded together. Therefore, a slight shift or the like when the substrates are bonded can be absorbed, so that mass productivity of the liquid crystal display device can be improved.
[0095]
The predetermined value is not particularly limited, and can be freely set in consideration of the interposition rate and the overlapping rate of the display electrode and the dummy electrode in the seal 5 within a range where the above margin is possible. it can.
[0096]
Also in the present embodiment, as in the first embodiment, the above display is performed so that the dispersion of the interposition rate and the overlapping rate of the display electrodes and the dummy electrodes on the four sides of the seal 5 is not more than a predetermined value. By designing the electrodes for use and the dummy electrodes, the thickness of the liquid crystal layer 9 in the vicinity of the seal 5 can be made substantially uniform on the four sides. Therefore, density unevenness in the vicinity of the seal 5 can be eliminated, so that display quality can be improved.
[0097]
The interposition rate and the overlapping rate of the display electrode and dummy electrode seal 5 in the scanning electrode routing portion 32, the signal electrode routing portion 31, and the liquid crystal sealing port side electrode portion 33 will be described later. 2 will be described in detail.
[0098]
[Embodiment 3]
The following will describe still another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as those of the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.
[0099]
As shown in FIG. 20, the liquid crystal display device according to the present embodiment replaces the signal electrode routing portion 31 of the second embodiment as a routing portion of the signal electrode 3 formed on the signal electrode substrate 1. In addition, a signal electrode routing portion 41, a scanning electrode routing portion 42 instead of the scanning electrode routing portion 32, and a liquid crystal sealing port side electrode portion 43 instead of the liquid crystal sealing port side electrode portion 33 are provided.
[0100]
As shown in FIGS. 21 and 22, the scanning electrode routing portion 42 has a line width of a double dummy electrode 44 formed on the signal electrode substrate 1 so as to face the routing electrode 19 and the interelectrode dummy electrode 20. However, both the portion facing the routing electrode 19 and the portion facing the inter-electrode dummy electrode 20 are narrowed by a predetermined value.
[0101]
Further, as shown in FIG. 23, the signal electrode routing portion 41 has a line width of the double dummy electrode 45 formed on the scanning electrode substrate 2 facing the routing electrode 23 so that the routing electrode 23 It is formed to be narrower by a predetermined value than the line width.
[0102]
Further, as shown in FIG. 24, the liquid crystal sealing port side electrode portion 43 has a line width of the double dummy electrode 46 formed on the signal electrode substrate 1 so as to face the extended electrode 25 so that the extended electrode 25 It is formed to be narrower by a predetermined value than the line width.
[0103]
As in the second embodiment, the difference from the first embodiment is that the double dummy electrode is designed to have a line width different from that of the opposing electrode. This is because the wiring resistance, the interposition rate, and the overlap rate of the part are set to values within a predetermined range.
[0104]
Also in the present embodiment, as in the first and second embodiments, the variation in the interposition rate and the overlap rate of the display electrodes and the dummy electrodes on the four sides of the seal 5 is less than a predetermined value. Furthermore, by designing the display electrode and the dummy electrode, the thickness of the liquid crystal layer 9 in the vicinity of the seal 5 can be made substantially uniform on the four sides. Therefore, density unevenness in the vicinity of the seal 5 can be eliminated, so that display quality can be improved.
[0105]
The interposition rate and the overlap rate of the display electrode and dummy electrode seal 5 in the signal electrode routing portion 41, the scanning electrode routing portion 42, and the liquid crystal sealing port side electrode portion 43 will be described in detail in Example 3 described later. In the following.
[0106]
【Example】
[Example 1]
An embodiment of the present invention will be described with reference to FIGS. 1 to 7 as follows.
[0107]
In this example, the interposition rate of the display electrode and the dummy electrode in the seal 5 in the scanning electrode routing unit 16, the signal electrode routing unit 15, and the liquid crystal filling port side electrode unit 17 described in the first embodiment and The variation in overlap rate is described.
[0108]
The interposition ratio is defined by the occupation ratio of the electrode area in the seal 5. Further, the overlapping rate is defined by the occupation rate in the seal 5 of the area of the overlapping region S of two opposing electrodes as shown in FIG.
[0109]
However, in order to simplify the design, in this embodiment and the following other embodiments, “electrode line width / electrode pitch” is used as the interposition rate, and “line width of the two opposing electrodes is narrow. The scanning electrode routing unit 16, the signal electrode routing unit 15, and the liquid crystal sealing port side electrode unit 17 are designed with the "line width / electrode pitch" as the overlap rate.
[0110]
In each electrode routing portion, the double dummy electrode is formed on the opposing substrate so as to overlap the electrode routing portion. Further, dummy electrodes are also formed between the terminal groups of the terminal portions I and II so that the interposition rate and the overlap rate are constant.
[0111]
As shown in FIG. 11, the terminal part II has three times as many connection terminals as the terminal part I. Therefore, the width of the display electrode extending from the terminal portion II is about 1/3 of the width of the display electrode extending from the terminal portion I, and the pitch of the lead-out electrodes 15 of the terminal portion II is the terminal portion I. It is formed narrower than the pitch. Therefore, an inter-electrode dummy electrode 20 is formed between the lead electrodes 19 of the scanning electrode lead part 16 of the terminal part I, but between the lead electrodes 23 of the signal electrode lead part 16 of the terminal part II. The interelectrode dummy electrode is not formed.
[0112]
Further, in the liquid crystal sealing port side electrode portion 17, the electrode width of the display electrode and the dummy electrode in the seal 5 portion is narrowed so that the interposition ratio of the electrode of the seal 5 is substantially the same as the other sides.
[0113]
First, in the case of the scanning electrode routing portion 16, as shown in FIG. 2, the electrode pitch a of the linear portion 19a of the routing electrode 19 is 0.2000 mm, the line width b of the linear portion 19a is 0.0665 mm, and the inter-electrode dummy The line width c of the electrode 20 is designed to be 0.0886 mm, the electrode pitch d of the inclined portion 19b of the routing electrode 19 is set to 0.1530 mm, the line width e of the inclined portion 19b is set to 0.1187 mm, and 2 shown in FIG. The line width and electrode pitch of the heavy dummy electrode 21 are designed to be the same as those of the routing electrode 19 and the inter-electrode dummy electrode 20 corresponding to the double dummy electrode 21.
[0114]
Next, in the case of the signal electrode routing portion 15, as shown in FIG. 4, the electrode pitch f of the linear portion 23a of the routing electrode 23 is 0.0710 mm, and the line width g of the linear portion 23a is 0.0551 mm. The electrode pitch h of the inclined portion 23b of the electrode 23 is designed to be 0.0695 mm, the line width i of the inclined portion 23b is 0.0539 mm, and each line width and electrode pitch of the double dummy electrode 24 shown in FIG. It is designed to be the same as the routing electrode 23 corresponding to the double dummy electrode 24.
[0115]
Finally, in the case of the liquid crystal sealing inlet side electrode portion 17, as shown in FIG. 6, the electrode pitch j of the extended electrodes 25 is designed to be 0.2730 mm, and the line width k of the extended electrodes 25 is 0.2118 mm. The electrode pitch and line width of the double dummy electrode 26 shown in FIG. 7 are designed to be the same as those of the extended electrode 25.
[0116]
The display electrode and the dummy electrode in the liquid crystal display device as shown in FIG. 1 having the scanning electrode routing portion 16, the signal electrode routing portion 15, and the liquid crystal sealing port side electrode portion 17 thus designed. The intervening rate and the overlapping rate are as shown in Table 1 below.
[0117]
[Table 1]

[0118]
From Table 1, it can be seen that the interposition rate and the overlapping rate of the display electrode and the dummy electrode existing on the seal 5 on each side of the outer peripheral portion of the display area of the liquid crystal display device are substantially the same. In this case, the interposition ratio is the sum of the interposition ratio of the display electrode and the inter-electrode dummy electrode and the interposition ratio of the double dummy electrode. Further, the wiring resistance of the display electrode at this time is designed to be uniform on each side.
[0119]
Then, as a result of forming the STN type color liquid crystal display device using the signal electrode substrate 1 and the scanning electrode substrate 2 having the display electrode and the dummy electrode designed as described above, the brightness of each of the four sides of the display area outer periphery is determined. The shading became uniform. Further, by adjusting the diameter of the glass beads of the in-seal spacer 6 included in the seal 5, the brightness in the vicinity of the seal in the display area on all four sides is adjusted to the brightness in the center of the display area. It became possible.
[0120]
The interposition rate and the overlapping rate of the dummy electrodes provided in the space on the seal 5 between the scanning electrode routing portions 16 and between the signal electrode routing portions 15 are also the above-mentioned scanning electrode routing portion 16 and signal electrode routing. The four sides are arranged to be substantially the same in accordance with the interposition rate and the overlap rate of the display electrode and the dummy electrode of the turning portion 15 and the interposition rate and the overlap rate of the dummy electrode of the liquid crystal sealing port side electrode portion 17.
[0121]
[Example 2]
The following will describe another embodiment of the present invention with reference to FIGS. For convenience of explanation, the symbols used for the defined electrode pitch and line width in Example 1 are used as they are.
[0122]
In this example, the interposition rate of the display electrode and the dummy electrode in the seal 5 in the scanning electrode lead portion 32, the signal electrode lead portion 31, the liquid crystal filling port side electrode portion 33 described in the second embodiment, and The variation in overlap rate is described.
[0123]
In the present embodiment, as in the first embodiment, in order to simplify the design, “electrode line width / electrode pitch” is used as the interposition rate, and “the smaller of the line widths of the two opposing electrodes”. The scanning electrode routing portion 32, the signal electrode routing portion 31, and the liquid crystal sealing port side electrode portion 33 are designed with the “line width / electrode pitch” as the overlap rate.
[0124]
In each electrode routing portion, the double dummy electrode is formed on the opposing substrate so as to overlap the electrode routing portion. Further, dummy electrodes are also formed between the terminal groups of the terminal portions I and II so that the interposition rate and the overlap rate are constant.
[0125]
The difference from the first embodiment is that the double dummy electrode is designed so that the line width of the double dummy electrode is different from the line width of the opposing electrode. This is because the wiring resistance of the electrode routing portion, the interposition rate, and This is because the overlapping rate is set to a value within a predetermined range.
[0126]
As shown in FIG. 11, the terminal portion II has three times as many connection terminals as the terminal portion I, and the width of the display electrode extending from the terminal portion II is the display electrode extending from the terminal portion I. The pitch of the routing electrodes 31 of the terminal part II is formed narrower than the pitch of the terminal part I. Therefore, the interelectrode dummy electrode 20 is formed between the routing electrodes 19 of the scanning electrode routing portion 32 of the terminal portion I, but between the routing electrodes 23 of the signal electrode routing portion 31 of the terminal portion II. The interelectrode dummy electrode is not formed.
[0127]
Further, in the liquid crystal sealing port side electrode portion 33, the electrode width of the display electrode and the dummy electrode in the portion of the seal 5 is narrowed so that the interposition ratio of the electrode of the seal 5 is substantially the same as the other sides.
[0128]
First, in the case of the scanning electrode lead portion 32, as shown in FIGS. 14 and 15, the electrode pitch a of the straight portion 19a of the lead electrode 19 is 0.1800 mm, the line width b of the straight portion 19a is 0.0864 mm, The inter-electrode dummy electrode 20 is designed so that the line width c is 0.0536 mm, the electrode pitch d of the inclined portion 19b of the routing electrode 19 is 0.1520 mm, and the line width e of the inclined portion 19b is 0.1320 mm. The electrode pitch l of the double dummy electrode 34 corresponding to the straight portion 19a of the electrode 19 is 0.1800 mm, the line width m of the double dummy electrode 34 corresponding to the straight portion 19a is 0.0492 mm, and corresponds to the inter-electrode dummy electrode 20 The line width n of the double dummy electrode 34 is 0.0700 mm, the electrode pitch o of the double dummy electrode 34 corresponding to the inclined portion 19b of the routing electrode 19 is 0.1520 mm, It is designed line width p of the double dummy electrodes 34 corresponding to the slope portion 19b as 0.0869Mm.
[0129]
Next, in the case of the signal electrode routing portion 31, as shown in FIGS. 16 and 17, the electrode pitch f of the linear portion 23a of the routing electrode 23 is 0.0700 mm, and the line width g of the linear portion 23a is 0.0400 mm. The double dummy electrode is designed so that the electrode pitch h of the inclined portion 23b of the routing electrode 23 is 0.0642 mm, the line width i of the inclined portion 23b is 0.0492 mm, and corresponds to the straight portion 23a of the routing electrode 23. The electrode pitch q of 35 is 0.0700 mm, the line width r of the double dummy electrode 35 corresponding to the straight portion 29 a is 0.0536 mm, and the electrode pitch s of the double dummy electrode 35 corresponding to the inclined portion 23 b of the routing electrode 23. Is set to 0.0642 mm, and the line width t of the double dummy electrode 35 corresponding to the inclined portion 23b is set to 0.0367 mm.
[0130]
Finally, in the case of the liquid crystal sealing port side electrode section 33, as shown in FIGS. 18 and 19, the electrode pitch j of the extended electrodes 25 is designed to be 0.2400 mm, and the line width k of the extended electrodes 25 is set to 0.2084 mm. In addition, the electrode pitch u of the double dummy electrode 36 is designed to be 0.2400 mm, and the line width v of the double dummy electrode 36 is set to 0.1371 mm.
[0131]
The display electrodes and dummy electrodes in the liquid crystal display device as shown in FIG. 13 having the scanning electrode routing portion 32, the signal electrode routing portion 31, and the liquid crystal sealing port side electrode portion 33 designed as described above. The intervening rate and the overlapping rate are as shown in Table 2 below.
[0132]
[Table 2]

[0133]
From Table 2, it can be seen that the interposition rate and the overlapping rate of the display electrode and the dummy electrode existing on the seal 5 on each side of the outer peripheral portion of the display area of the liquid crystal display device are substantially the same. In this case, the interposition ratio is the sum of the interposition ratio of the display electrode and the inter-electrode dummy electrode and the interposition ratio of the double dummy electrode. Further, the wiring resistance of the display electrode at this time is designed to be uniform on each side.
[0134]
Then, as a result of forming the STN type color liquid crystal display device using the signal electrode substrate 1 and the scanning electrode substrate 2 having the display electrode and the dummy electrode designed as described above, the brightness of each of the four sides of the display area outer periphery is determined. The shading became uniform. Further, by adjusting the diameter of the glass beads of the in-seal spacer 6 included in the seal 5, the brightness in the vicinity of the seal in the display area on all four sides is adjusted to the brightness in the center of the display area. It became possible.
[0135]
It should be noted that the interposition rate and the overlap rate of the dummy electrodes provided in the space on the seal 5 between the scanning electrode routing portions 32... And the signal electrode routing portions 31. The four sides are arranged to be substantially the same in accordance with the interposition rate and the overlap rate of the display electrode and the dummy electrode of the electrode routing portion 31 and the interposition rate and the overlap rate of the dummy electrode of the liquid crystal sealing port side electrode portion 33. Yes.
[0136]
The above-mentioned interposition rate and overlap rate are design interposition rates and overlap rates. When the signal electrode substrate 1 and the scan electrode substrate 2 are actually bonded together with the seal 5, the display rate is increased by a manufacturing process such as etching. There is a possibility that the interposition rate and the overlap rate of the electrodes and the dummy electrodes are slightly changed.
[0137]
Therefore, in this example, after the liquid crystal display device was completed, the intervening ratio and the overlapping ratio of the display electrode and the dummy electrode were measured. For this measurement, two liquid crystal display devices formed based on the design conditions shown in Table 2 were used. And this measurement result came to show in the following Tables 3 and 4.
[0138]
[Table 3]

[0139]
[Table 4]

[0140]
From Tables 3 and 4 above, it can be seen that the variation in the overlap ratio on the four sides of the display electrode and the dummy electrode is larger than the design conditions shown in Table 2. However, the variation in the overlap rate on the four sides in the display areas of Tables 3 and 4 was acceptable, although the difference in brightness was slightly different. That is, in the liquid crystal display device formed based on the design conditions shown in Table 2, although there is some variation in the overlapping ratio of the display electrodes and the dummy electrodes on the four sides of the seal 5, It was found that shading unevenness with the vicinity of the seal 5 can be reduced within an allowable range.
[0141]
The variation in the overlap ratio on the four sides of the seal 5 improves the display quality as the four sides are closer to 0%, but from Tables 3 and 4, the variation in the overlap ratio on the four sides of the seal 5 is ± 5. It can be seen that the quality level is at or below%. If the variation in the overlap ratio is within ± 3%, the quality is further improved, and if it can be suppressed to within ± 1%, it is possible to display a high quality with no difference in density on the four sides. .
[0142]
Therefore, in the case of the present embodiment, the predetermined value of the variation in the overlap ratio on the four sides is preferably ± 5%, more preferably ± 3%, and more preferably ± 1%. If the predetermined value of the variation in the overlap ratio on the four sides is set, and the display electrode and the dummy electrode on the four sides of the seal 5 are formed so that the variation in the absolute value of the overlap ratio is equal to or less than the predetermined value, By playing the role of a support in the seal, the glass bead abundance of the in-seal spacer 6 that determines the thickness of the seal 5 becomes substantially constant, and the thickness of the seal 5 can be made substantially the same on the four sides. Thereby, the density unevenness on the four sides in the vicinity of the seal 5 in the display area can be reduced, so that the display quality can be improved.
[0143]
Further, if the display electrode and the dummy electrode on the four sides of the seal 5 are formed so that the absolute value of the dispersion on the four sides of the interposition rate is suppressed to ± 10% or less, the spacer 6 in the seal 5 is formed on the seal 5. The portion where the glass beads are sandwiched between the display electrode and the dummy electrode, the portion where only the display electrode or the dummy electrode is present, and the portion where any of the above electrodes is not present The absolute value of the variation at the four sides of the exclusive ratio becomes a predetermined value or less, and the thickness of the seal 5 can be made substantially the same at the four sides. Thereby, the density unevenness on the four sides in the vicinity of the seal 5 in the display area can be reduced, so that the display quality can be improved.
[0144]
Note that the variation in the interposition rate and the overlap rate is determined by a manufacturing process such as etching as described above. Therefore, by improving the etching accuracy at the time of forming the display electrode and the dummy electrode and reducing the variation due to the etching, the variation of the interposition rate and the overlapping rate can be approached as much as 0%, and the display quality is further improved. Can be improved.
[0145]
Example 3
The following will describe still another embodiment of the present invention with reference to FIGS. For convenience of explanation, the symbols used for the defined electrode pitch and line width are used as they are in the first and second embodiments.
[0146]
In this example, the interposition rate of the display electrode and the dummy electrode in the seal 5 in the scanning electrode lead-out portion 42, the signal electrode lead-out portion 41, and the liquid crystal filling port side electrode portion 43 described in the third embodiment is described. The variation in overlap rate is described.
[0147]
In the present embodiment, as in the first and second embodiments, in order to simplify the design, the “electrode line width / electrode pitch” is used as the interposition rate, and “of the line widths of the two opposing electrodes” The scanning electrode routing portion 42, the signal electrode routing portion 41, and the liquid crystal sealing port side electrode portion 43 are designed using the narrower line width / electrode pitch "as the overlapping rate.
[0148]
In each electrode routing portion, the double dummy electrode is formed on the opposing substrate so as to overlap the electrode routing portion. Further, dummy electrodes are also formed between the terminal groups of the terminal portions I and II so as to make the intervention ratio and the overlapping ratio constant.
[0149]
In this embodiment, in order to set the wiring resistance of the electrode routing portion, the interposition rate and the overlap rate to values in a predetermined range, the line width of the double dummy electrode is different from that of the first embodiment. The second embodiment is the same as the second embodiment in that the design is made different from the line width.
[0150]
As shown in FIG. 11, the terminal part II has three times as many connection terminals as the terminal part I. Therefore, the width of the display electrode extending from the terminal portion II is about 1/3 of the width of the display electrode extending from the terminal portion I, and the pitch of the routing electrodes 31 of the terminal portion II is set to the terminal portion I. It is formed narrower than the pitch. Therefore, the interelectrode dummy electrode 20 is formed between the lead electrodes 19 of the scanning electrode lead part 32 of the terminal part I, but between the lead electrodes 23 of the signal electrode lead part 31 of the terminal part II. The interelectrode dummy electrode is not formed.
[0151]
Further, in the liquid crystal sealing port side electrode portion 33, the electrode width of the display electrode and the dummy electrode is narrowed in the seal 5 in order to make the interposition ratio of the electrode of the seal 5 almost the same as the other sides.
[0152]
First, in the case of the scanning electrode lead portion 42, as shown in FIGS. 21 and 22, the electrode pitch a of the straight portion 19a of the lead electrode 19 is 0.2400 mm, the line width b of the straight portion 19a is 0.0476 mm, The inter-electrode dummy electrode 20 is designed with a line width c of 0.1524 mm, an electrode pitch d of the inclined portion 19b of the routing electrode 19 of 0.1413 mm, and a line width e of the inclined portion 19b of 0.1183 mm. The electrode pitch l of the double dummy electrode 44 corresponding to the straight portion 19a of the electrode 19 is 0.2400 mm, the line width m of the double dummy electrode 44 corresponding to the straight portion 19a is 0.0319 mm, and corresponds to the inter-electrode dummy electrode 20 The line width n of the double dummy electrode 44 is 0.0797 mm, the electrode pitch o of the double dummy electrode 44 corresponding to the inclined portion 19b of the routing electrode 19 is 0.1413 mm, Is designed line width p of the double dummy electrode 44 corresponding to the slope portion 19b as 0.0657Mm.
[0153]
Next, in the case of the signal electrode routing portion 41, as shown in FIG. 23, the electrode pitch f of the linear portion 23a of the routing electrode 23 is 0.0860 mm, and the line width g of the linear portion 23a is 0.0400 mm. The electrode pitch h of the inclined portion 23b of the electrode 23 is designed to be 0.0732 mm, the line width i of the inclined portion 23b is 0.0572 mm, and the electrode of the double dummy electrode 45 corresponding to the straight portion 23a of the routing electrode 23 The pitch q is 0.0860 mm, the line width r of the double dummy electrode 45 corresponding to the straight line portion 29 a is 0.0672 mm, and the electrode pitch s of the double dummy electrode 45 corresponding to the inclined portion 23 b of the routing electrode 23 is 0. The double dummy electrode 45 corresponding to the inclined portion 23b is designed to have a line width t of 0.0732 mm and 0.0340 mm.
[0154]
Finally, in the case of the liquid crystal sealing port side electrode portion 43, as shown in FIG. 24, the electrode pitch j of the extended electrodes 25 is designed to be 0.3510 mm, and the line width k of the extended electrodes 25 is set to 0.2939 mm. The electrode pitch u of the double dummy electrode 46 is designed to be 0.3510 mm, and the line width v of the double dummy electrode 46 is designed to be 0.1633 mm.
[0155]
The display electrode and the dummy electrode in the liquid crystal display device as shown in FIG. 20 having the scanning electrode routing portion 42, the signal electrode routing portion 41, and the liquid crystal sealing port side electrode portion 43 designed as described above. The intervening rate and the overlapping rate are as shown in Table 5 below.
[0156]
[Table 5]

[0157]
From Table 5, it can be seen that the interposition rate and the overlapping rate of the display electrode and the dummy electrode existing on the seal 5 on each side of the outer peripheral portion of the display area of the liquid crystal display device are substantially the same. In this case, the interposition ratio is the sum of the interposition ratio of the display electrode and the inter-electrode dummy electrode and the interposition ratio of the double dummy electrode. The wiring resistance of the display electrode at this time is designed to be uniform on each side.
[0158]
Then, as a result of forming the STN type color liquid crystal display device using the signal electrode substrate 1 and the scanning electrode substrate 2 having the display electrode and the dummy electrode designed as described above, the brightness of each of the four sides of the display area outer periphery is determined. The shading became uniform. Further, by adjusting the diameter of the glass beads of the in-seal spacer 6 included in the seal 5, the brightness in the vicinity of the seal in the display area on all four sides is adjusted to the brightness in the center of the display area. It became possible.
[0159]
It should be noted that the interposition rate and the overlapping rate of the dummy electrodes provided in the space on the seal 5 between the scanning electrode routing portions 42 and the signal electrode routing portions 41. The four sides are arranged to be substantially the same in accordance with the interposition rate and the overlap rate of the display electrode and the dummy electrode of the electrode routing portion 41 and the interposition rate and the overlap rate of the liquid crystal sealing port side electrode portion 43.
[0160]
In each of the first to third embodiments described above, the case where the electrode pitches in the electrode routing portion are designed to be equally spaced has been described. However, the variation in the interposition rate and the overlap rate of the display electrode and the dummy electrode in the seal 5 is four sides. If the pitches can be made substantially the same, the pitches need not be equally spaced, and similar effects can be obtained even if the pitches fluctuate.
[0161]
Hereinafter, a liquid crystal display device designed as a comparative example with respect to the above-described Examples 1 to 3 without special consideration of variations in the interposition rate and the overlap rate of the display electrodes and dummy electrodes on the four sides of the seal 5 will be described.
[0162]
[Comparative example]
In this comparative example, the design of the scanning electrode lead portion 144, the signal electrode lead portion 143, and the liquid crystal sealing inlet side electrode portion 147 of the liquid crystal display device shown in FIG. The configuration of the scanning electrode routing portion 144, the signal electrode routing portion 143, and the liquid crystal sealing inlet side electrode portion 147 is the same as that of the second embodiment, and the electrode pitch and line width are different. And Accordingly, FIGS. 14, 16, and 18 of the second embodiment are used as explanatory diagrams of the respective parts.
[0163]
First, in the case of the scanning electrode lead portion 144, as shown in FIG. 14, the electrode pitch a of the straight portion 19a of the lead electrode 19 is 0.2000 mm, the line width b of the straight portion 19a is 0.0745 mm, and the inter-electrode dummy The line width c of the electrode 20 is designed to be 0.0993 mm, the electrode pitch d of the inclined portion 19b of the routing electrode 19 is 0.1530 mm, the line width e of the inclined portion 19b is 0.1380 mm, and the routing electrode 19 The electrode pitch l of the double dummy electrode 34 corresponding to the straight portion 19a is 0.2000 mm, the line width m of the double dummy electrode 34 corresponding to the straight portion 19a is 0.0545 mm, and the double corresponding to the inter-electrode dummy electrode 20 The line width n of the dummy electrode 34 is 0.0793 mm, the electrode pitch o of the double dummy electrode 34 corresponding to the inclined portion 19b of the routing electrode 19 is 0.2000 mm, and the inclined portion 19 The line width p corresponding double dummy electrode 34 is designed as a 0.1180Mm.
[0164]
Next, in the case of the signal electrode routing portion 143, as shown in FIG. 16, the electrode pitch f of the linear portion 23a of the routing electrode 23 is 0.0710 mm, and the line width g of the linear portion 23a is 0.0416 mm. The electrode pitch h of the inclined portion 23b of the electrode 23 is designed to be 0.0695 mm, the line width i of the inclined portion 23b is 0.0544 mm, and the electrode of the double dummy electrode 34 corresponding to the straight portion 23a of the routing electrode 23 The pitch q is 0.0710 mm, the line width r of the double dummy electrode 34 corresponding to the straight portion 29 a is 0.0216 mm, and the electrode pitch s of the double dummy electrode 34 corresponding to the inclined portion 23 b of the routing electrode 23 is 0.0. The double dummy electrode 34 corresponding to the inclined part 23b is designed to have a line width t of 0.0695 mm.
[0165]
Finally, in the case of the liquid crystal sealing port side electrode portion 147, as shown in FIG. 18, the electrode pitch j of the extended electrode 25 is designed to be 0.2730 mm, and the line width k of the extended electrode 25 is set to 0.2530 mm. The electrode pitch u of the double dummy electrode 36 is designed to be 0.2730 mm, and the line width v of the double dummy electrode 36 is designed to be 0.2330 mm.
[0166]
The display electrode and dummy electrode in the liquid crystal display device as shown in FIG. 32, having the scanning electrode lead portion 144, the signal electrode lead portion 143, and the liquid crystal sealing port side electrode portion 147, designed as described above. The intervening rate and the overlapping rate are as shown in Table 6 below.
[0167]
[Table 6]

[0168]
From Table 6, it can be seen that there is variation in the values of the interposition rate and the overlap rate of the display electrodes and the dummy electrodes existing on the seal 5 on each side of the outer peripheral portion of the display area of the liquid crystal display device. In this case, the interposition ratio is the sum of the interposition ratio of the display electrode and the inter-electrode dummy electrode and the interposition ratio of the double dummy electrode. The wiring resistance of the display electrode at this time is designed to be uniform on each side.
[0169]
Then, as a result of forming the STN type color liquid crystal display device using the substrates 141 and 142 having the display electrode and the dummy electrode designed as described above, the brightness of each of the four sides in the vicinity of the seal 145 at the outer periphery of the display area. The shading was uneven (the upper and lower sides were at the same level). Further, by adjusting the diameter of the glass beads of the spacer 6 in the seal included in the seal 145, the brightness in the vicinity of the seal 145 in the display area on all four sides is also changed to the brightness in the center of the display area. It was impossible to match.
[0170]
From the above, as in the present invention, the display electrode is arranged so that the variation in the interposition rate and the overlap rate of the display electrode and the dummy electrode existing on the seal is not more than a predetermined value on the four sides of the display area. By forming the dummy electrode, the thickness of the liquid crystal layer at the center of the display area and the vicinity of the seal can be made substantially uniform. As a result, it is possible to eliminate variations in brightness caused by the difference in thickness of the liquid crystal layer, and display quality can be improved.
[0171]
In the embodiments and examples of the present invention, among liquid crystal display devices that require a narrow margin of liquid crystal characteristics, high display quality, high-speed response, high definition, and a narrow frame, an STN type color liquid crystal display device. However, the present invention is not limited to this, but can be applied to a TN liquid crystal display device, and can also be applied to other types of liquid crystal display devices.
[0172]
Further, in each of the above-described embodiments and examples, it has been described that both the intervention rate and the overlap rate have variations within a predetermined value. However, at least the overlap rate is set to be a variation within the predetermined value. For example, the abundance ratio of the glass beads that determine the thickness of the seal by playing the role of the support in the seal becomes substantially constant, and the thickness of the seal can be made substantially the same on the four sides. Thereby, density unevenness on the four sides in the vicinity of the seal in the display area can be reduced, so that display quality can be improved.
[0173]
【The invention's effect】
As described above, the liquid crystal display device according to the first aspect of the present invention includes a pair of substrates on which a plurality of display electrodes are formed, and a spacer that functions as a support column. A seal for connecting the surfaces facing each other, a liquid crystal layer formed by sealing liquid crystal in a space surrounded by the pair of substrates and the seal, and the thickness of the liquid crystal layer is made uniform in the display area Therefore, the opposing display electrodes formed on the pair of substrates have different line widths and electrode pitches, and the display electrodes and the dummy electrodes are Interspersed on the four sides of the seal In addition, the display electrode has an extended electrode extending beyond the seal portion from the scanning electrode, and an overlap ratio indicating an occupation ratio in the seal in an area of an area where electrodes facing each other overlap each other On the seal above To be almost the same on all four sides The line width of the extended electrode and the dummy electrode is narrower than the line width of the scan electrode. It is the structure formed.
[0174]
Therefore, since the absolute value of the variation in the four sides of the overlapping rate indicating the overlapping degree of the display electrode and the dummy electrode facing each other on the seal is less than or equal to the predetermined value, The role of the glass beads that determine the thickness of the seal is substantially constant, and the thickness of the seal can be made substantially equal on the four sides. As a result, density unevenness on the four sides in the vicinity of the seal in the display area can be reduced, and the display quality can be improved.
[0175]
In the liquid crystal display device according to a second aspect of the present invention, as described above, in addition to the configuration of the first aspect, the electrode lead-out portion of the display electrode from the display area corresponds to a connection terminal with an external circuit. In this way, the electrodes of the electrode routing portions of each block are formed so that the arrangement density is higher on the connection terminal side with the external circuit than on the display area side, and the above Of the display electrodes and dummy electrodes formed on the pair of substrates, the electrodes facing each other on the seal in the region formed in parallel to the display electrodes in the display area and the connection terminals to the external circuit Indicates the occupancy ratio of the overlapping area in the seal Overlap rate and the opposing electrode on the seal outside the above region Indicates the occupancy ratio of the overlapping area in the seal Overlap rate So that the four sides are almost the same It is the structure formed.
[0176]
Therefore, in addition to the effect of the structure of claim 1, the electrode routing portion of the display electrode is divided into a plurality of blocks so as to correspond to the connection terminal with the external circuit, and the display area side display Designed so that the placement density of the display routing electrode on the side of the connection terminal with the external circuit is higher than the placement density of the routing electrode, for example, effective in keeping the wiring resistance at a predetermined value. Of the electrode routing portions that connect the display electrodes in the display area and the connection terminals of the external circuit, even when the electrode width of the region parallel to the display electrode in the effective display area is different from the region parallel to the display electrode, Display electrode and dummy electrode facing an area parallel to and not parallel to the display electrode in the effective display area of the electrode routing portion connecting the display electrode in the effective display area and the connection terminal of the external circuit Of overlap ratio Since the display electrode and the dummy electrode are formed so that the absolute value is less than or equal to the predetermined value, the region parallel to the display electrode in the effective display area in one block of the electrode routing portion is not parallel to the region It is possible to reduce the density unevenness due to the difference in the occupancy ratios of the two, and to reduce the density unevenness due to the difference in the overlapping ratios of the four sides.
[0177]
As described above, the liquid crystal display device according to a third aspect of the present invention has the above-described dummy electrode, wherein the dummy electrode includes an inter-electrode dummy electrode formed between display electrodes, and these display electrodes. And a double dummy electrode formed on the opposite substrate of the substrate on which the interelectrode dummy electrode is formed, wherein the double dummy electrode is On board The display electrode and the interelectrode dummy electrode are formed to face each other.
[0178]
Therefore, in addition to the effect of the structure of claim 1 or 2, the seal sandwiched between the substrates is a seal corresponding to a portion having electrodes on both the upper and lower substrates, and a portion having no electrodes on both the upper and lower substrates. It can be divided into seals corresponding to. That is, it is possible to eliminate a seal portion having electrodes only on one substrate. Thereby, the thickness of the seal can be easily uniformed by the thickness adjusting member such as the glass beads of the spacer in the seal included in the seal. In addition, since the display electrode and the dummy electrode facing each other on the seal are formed so that the absolute value of the variation in the overlap ratio on the four sides is not more than a predetermined value, the thickness of the seal is almost the same on the four sides. There is an effect that it is easy to do.
[0179]
In the liquid crystal display device according to a fourth aspect of the present invention, as described above, in addition to the configuration of the third aspect, the double dummy electrode has a line width of the display electrode and the inter-electrode dummy electrode with opposite line widths. And different It is the structure formed so that it may become.
[0180]
Therefore, in addition to the effect of the configuration of claim 3, the double dummy one electrode is formed so that the line width thereof differs from the line width of the opposing display electrode and the inter-electrode dummy electrode by a predetermined value. Therefore, it is possible to adjust the overlapping rate while maintaining the wiring resistance value of the display electrode at a predetermined value, and further, it is possible to absorb the deviation between the opposing electrodes when the substrates are bonded together. Play.
[0181]
As described above, the liquid crystal display device according to a fifth aspect of the invention has the above-described overlap ratio in addition to the configuration of the third or fourth aspect. opposite The overlapping ratio of the display electrode and the double dummy electrode; opposite Overlap ratio of inter-electrode dummy electrode and double dummy electrode When It is the composition that it is the sum of.
[0182]
Therefore, in addition to the effect of the configuration of claim 3 or 4, the overlapping ratio between the opposing display electrode and the dummy electrode is such that the overlapping ratio between the opposing display electrode and the double dummy electrode, and the inter-electrode dummy electrode and 2 The sum of the overlap ratio of the double dummy electrodes allows the overlap ratio of the display electrode and the double dummy electrode and the overlap ratio of the inter-electrode dummy electrode and the double dummy electrode to be different from each other. It is sufficient if the sum is substantially the same on the four sides of the seal. As a result, it is only necessary that the overlapping ratio of the display electrode and the dummy electrode is finally substantially the same on all sides of the seal, so that the overlapping ratio of the display electrode, the inter-electrode dummy electrode and the double dummy electrode is all uniform. There is no need to do it. Therefore, it is possible to easily design the electrodes of the liquid crystal display device and improve the mass productivity.
[0183]
As described above, the liquid crystal display device according to the sixth aspect of the invention has the above-described configuration in addition to any one of the first to fifth aspects. Note Nari rate is opposite Ruden In this configuration, the ratio is the ratio of the line width to the pitch of the overlapping portions of the poles.
[0184]
Therefore, in addition to the effect of the structure according to any one of claims 1 to 5, the overlapping rate is a ratio of the line width of the electrode to the formation pitch of the display electrode and the dummy electrode. There is an effect that the design when the dummy electrode is formed on the substrate can be facilitated.
[0185]
In the liquid crystal display device according to the seventh aspect of the present invention, as described above, in addition to the structure of any one of the first to sixth aspects, the display electrode and the dummy electrode of the liquid crystal display device are interposed on four sides on the seal. And the interposition indicating the ratio of the above electrode on this seal Rate is In this configuration, the four sides are substantially the same.
[0186]
Therefore, in addition to the effect of the structure according to any one of claims 1 to 6, the absolute value of the dispersion on the four sides of the interposition ratio indicating the ratio of the display electrode and the dummy electrode on the seal is not more than a predetermined value. The glass beads of the spacer in the seal are sandwiched between the display electrode and the dummy electrode, the portion where only the display electrode or the dummy electrode is present, and the above The absolute value of the variation at the four sides of the portion occupied by the portion sandwiched by the portions where none of the electrodes exist is less than a predetermined value, and the thickness of the seal can be made substantially the same at the four sides. As a result, density unevenness on the four sides in the vicinity of the seal in the display area can be reduced, so that the display quality can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of a scanning electrode routing portion provided in the liquid crystal display device shown in FIG.
3 is a cross-sectional view taken along line AA of the scanning electrode lead portion shown in FIG. 2;
FIG. 4 is an enlarged view of a main part of a signal electrode routing portion provided in the liquid crystal display device shown in FIG.
5 is a cross-sectional view taken along line B-B of the signal electrode routing portion shown in FIG. 4;
6 is an enlarged view of a main part of a liquid crystal sealing port side electrode portion provided in the liquid crystal display device shown in FIG. 1. FIG.
7 is a cross-sectional view taken along the line CC of the liquid crystal sealing inlet side electrode portion shown in FIG. 6;
FIG. 8 is a schematic configuration diagram of the vicinity of the center of the scanning electrode routing portion shown in FIG. 2;
FIG. 9 is a schematic configuration diagram showing another configuration of the scanning electrode routing unit shown in FIG. 2;
10 is a schematic cross-sectional view of the liquid crystal display device shown in FIG.
11 is an explanatory diagram showing a relationship between a color filter layer, a signal electrode, and a scanning electrode provided in the liquid crystal display device shown in FIG.
FIG. 12 is an explanatory diagram of an overlap rate.
FIG. 13 is a schematic configuration diagram of a liquid crystal display device according to another embodiment of the present invention.
14 is an enlarged view of a main part of a scanning electrode routing portion provided in the liquid crystal display device shown in FIG.
15 is a cross-sectional view taken along the line D-D of the scanning electrode lead portion shown in FIG.
16 is an enlarged view of a main part of a signal electrode routing portion provided in the liquid crystal display device shown in FIG.
17 is a cross-sectional view taken along line EE of the signal electrode routing portion shown in FIG.
18 is an enlarged view of a main part of a liquid crystal sealing port side electrode portion provided in the liquid crystal display device shown in FIG. 13;
19 is a cross-sectional view taken along the line FF of the liquid crystal sealing inlet side electrode portion shown in FIG. 18;
FIG. 20 is a schematic configuration diagram of a liquid crystal display device according to still another embodiment of the present invention.
FIG. 21 is an enlarged view of a main part of a scanning electrode routing portion provided in the liquid crystal display device shown in FIG.
22 is a cross-sectional view taken along the line GG of the scanning electrode routing portion shown in FIG. 21. FIG.
23 is an enlarged view of a main part of a signal electrode routing portion provided in the liquid crystal display device shown in FIG.
24 is an enlarged view of a main part of a liquid crystal sealing port side electrode portion provided in the liquid crystal display device shown in FIG. 20;
25 is an explanatory diagram for comparing density unevenness in the liquid crystal display device shown in FIG. 1; FIG.
FIG. 26 is a graph showing the results of measurement based on the explanatory diagram shown in FIG.
27 is a graph showing the results of measurement based on the explanatory diagram shown in FIG.
FIG. 28 is a schematic cross-sectional view of a conventional liquid crystal display device.
FIG. 29 is a schematic configuration diagram of a conventional liquid crystal display device.
FIG. 30 is a schematic configuration diagram of a conventional liquid crystal display device.
FIG. 31 is a schematic configuration diagram of a conventional liquid crystal display device.
FIG. 32 is a schematic configuration diagram of a conventional liquid crystal display device.
FIG. 33 is a schematic cross-sectional view of a seal portion in a conventional liquid crystal display device.
[Explanation of symbols]
1 Signal electrode substrate (substrate)
2 Scanning electrode substrate (substrate)
3 Signal electrode
4 Scanning electrodes
5 Seal
6 Spacer in seal
7 Insulating film
8 Alignment film
9 Liquid crystal layer
10 In-cell spacer
11 Overcoat layer
12 Color filter layer
13 Black matrix
14 Liquid crystal inlet
15 Signal electrode routing
16 Scan electrode routing section
17 Liquid crystal sealing side electrode part
18 Connection terminal
19 Leading electrode (display electrode)
20 Dummy electrode between electrodes (dummy electrode)
21 Double dummy electrode (dummy electrode)
22 Connection terminal
23 Lead electrode (display electrode)
24 Double dummy electrode (dummy electrode)
25 Extended electrode (dummy electrode)
26 Double dummy electrode (dummy electrode)
31 Signal electrode routing
32 Scanning electrode routing section
33 Liquid crystal sealing port side electrode part
34 Double dummy electrode (dummy electrode)
35 Double dummy electrode (dummy electrode)
36 Double dummy electrode (dummy electrode)
41 Signal electrode routing section
42 Scanning electrode routing section
43 LCD side electrode part
44 Double dummy electrode (dummy electrode)
45 Double dummy electrode (dummy electrode)
46 Double dummy electrode (dummy electrode)

Claims (7)

A pair of substrates on which a plurality of display electrodes are formed;
A spacer that serves as a support is included, and a seal for connecting the electrode forming surfaces of the pair of substrates to face each other;
A liquid crystal layer formed by enclosing a liquid crystal in a space surrounded by the pair of substrates and the seal;
A dummy electrode formed on the pair of substrates in order to make the thickness of the liquid crystal layer uniform in a display area;
The opposing display electrodes formed on the pair of substrates have different line widths and electrode pitches,
The display electrode and the dummy electrode are interposed on the four sides on the seal, and the display electrode has an extended electrode extending beyond the seal portion from the scanning electrode,
The line width of the extended electrode and the dummy electrode is the same as that of the scanning electrode so that the overlapping ratio indicating the occupancy ratio in the area of the area where the electrodes facing each other overlap is substantially the same on the four sides on the seal . A liquid crystal display device characterized by being formed narrower than a line width . The electrode lead portion of the display electrode from within the display area is
It is divided into a plurality of blocks so as to correspond to the connection terminals with the external circuit, and the arrangement of the electrodes in the electrode routing portions of each block is higher on the connection terminal side with the external circuit than on the display area side. And is formed to be
Of the display electrodes and dummy electrodes formed on the pair of substrates, the overlapping region of the electrodes facing each other on the seal of the region formed in parallel with the display electrodes in the display area and the connection terminals to the external circuit and overlapping ratio indicating a share in the seal area, and percentage overlap indicating occupancy in the seal area of the overlapping region of the electrodes opposed to each other in the seal other than the above region, so as to be substantially the same in the four sides The liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed. The dummy electrode includes an inter-electrode dummy electrode formed between display electrodes, and a double dummy electrode formed on a counter substrate of the substrate on which the display electrode and the inter-electrode dummy electrode are formed,
3. The liquid crystal display device according to claim 1, wherein the double dummy electrode is formed to face the display electrode and the inter-electrode dummy electrode on the substrate.   4. The liquid crystal display device according to claim 3, wherein the double dummy electrodes are formed so that their line widths are different from the line widths of the opposing display electrodes and interelectrode dummy electrodes.   5. The overlap ratio is a sum of an overlap ratio between an opposing display electrode and a double dummy electrode and an overlap ratio between an opposing inter-electrode dummy electrode and a double dummy electrode. Liquid crystal display device.   6. The liquid crystal display device according to claim 1, wherein the overlapping ratio is a ratio of a line width to a pitch of overlapping portions of opposing electrodes. The display electrode and the dummy electrode of the liquid crystal display device are formed so as to be interposed on the four sides on the seal, and the interposed ratio indicating the ratio occupied by the electrode on the seal is substantially the same on the four sides. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device.

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