JPH0943610A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPH0943610A JPH0943610A JP19311595A JP19311595A JPH0943610A JP H0943610 A JPH0943610 A JP H0943610A JP 19311595 A JP19311595 A JP 19311595A JP 19311595 A JP19311595 A JP 19311595A JP H0943610 A JPH0943610 A JP H0943610A
- Authority
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- Japan
- Prior art keywords
- pixel electrode
- liquid crystal
- display device
- crystal display
- line
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、基板間に液晶層が保持
されて成る液晶表示装置に係り、特に各表示画素を薄膜
トランジスタ（以下ＴＦＴと略称する。）にて表示制御
する液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device in which a liquid crystal layer is held between substrates, and more particularly to a liquid crystal display device in which each display pixel is display-controlled by a thin film transistor (hereinafter abbreviated as TFT). .
【０００２】[0002]
【従来の技術】近年、高機能、高精細を得るため、ＴＦ
Ｔを用いマトリクス状に配置された表示画素の表示制御
を行うアクティブマトリクス型液晶表示装置において
は、液晶表示装置特有の問題であった視角特性を改善す
る手法として、一画素を分子配列の異なる２つの領域に
分割する手法が提案されている。2. Description of the Related Art Recently, in order to obtain high functionality and high definition, TF
In an active matrix type liquid crystal display device that performs display control of display pixels arranged in a matrix using T, one pixel has a different molecular arrangement as a method of improving the viewing angle characteristic which is a problem peculiar to the liquid crystal display device. A method of dividing into two regions has been proposed.
【０００３】このアクティブマトリクス型の液晶表示装
置では、透明絶縁基板上に互いに直交して走査線及び信
号線が設けられ、この交差部毎にスイッチング素子と画
素電極が接続されている。各画素の駆動と制御を行う手
段として用いられるスイッチング素子には、透過型表示
が可能であり大面積化も容易である等の理由から、半導
体スイッチであるＴＦＴが通常用いられる。In this active matrix type liquid crystal display device, scanning lines and signal lines are provided on a transparent insulating substrate so as to be orthogonal to each other, and a switching element and a pixel electrode are connected at each intersection. A TFT, which is a semiconductor switch, is usually used for a switching element used as a means for driving and controlling each pixel, because a transmissive display is possible and a large area is easy.
【０００４】ＴＦＴは絶縁ゲート型の電界効果トランジ
スタの一種で、ゲートが走査線に、ドレインが信号線
に、ソースが画素電極に接続されている。アレイ基板に
はこの他に、各画素のＴＦＴの負荷となる液晶の容量の
放電の時定数を十分に大きくするために蓄積容量が設け
られている場合が有る。蓄積容量の一端は画素電極に、
もう一端は通常は蓄積容量線に接続されている。このア
レイ基板を用いた配向分割方式の液晶表示素子は、分子
配向の異なる領域の境界に出るディスクリネーションラ
インを蓄積容量線で遮蔽している。A TFT is a type of insulated gate field effect transistor, in which the gate is connected to the scanning line, the drain is connected to the signal line, and the source is connected to the pixel electrode. In addition to this, the array substrate may be provided with a storage capacitor in order to sufficiently increase the time constant of discharging the capacitance of the liquid crystal serving as the load of the TFT of each pixel. One end of the storage capacitor is the pixel electrode,
The other end is usually connected to the storage capacitance line. An alignment division type liquid crystal display device using this array substrate shields a disclination line appearing at a boundary between regions having different molecular orientations with a storage capacitor line.
【０００５】[0005]
【発明が解決しようとする課題】配向分割方式の液晶表
示装置においては、画素電極の配向方向の異なる領域の
境にディスクリネーションラインを生じる事から、これ
を遮蔽する必要があり、この遮蔽が、画素電極の開口率
を低下させる要因ともなっているが、従来は、蓄積容量
線をこの画素電極の領域の境に設け、遮蔽手段と兼用し
ていた。In an alignment division type liquid crystal display device, a disclination line is generated at a boundary between regions having different alignment directions of the pixel electrodes. Therefore, it is necessary to shield the disclination line. Although it also causes a reduction in the aperture ratio of the pixel electrode, conventionally, the storage capacitor line is provided at the boundary of the region of the pixel electrode and also serves as the shielding means.
【０００６】又画素電極の周辺部には、信号線や走査線
等との電位差により発生される横方向電界とプレチルト
の向きとの関係により、チルトリバースが発生し、この
チルトリバースをブラックマトリクスにて遮蔽する必要
が有る事から開口率が低下するという問題を生じてい
た。Further, in the peripheral portion of the pixel electrode, a tilt reverse occurs due to the relationship between the horizontal electric field generated by the potential difference between the signal line and the scanning line and the direction of the pretilt, and this tilt reverse is converted into a black matrix. Therefore, there is a problem that the aperture ratio is lowered because it is necessary to shield it.
【０００７】そこで本発明は上記課題を除去するもの
で、走査線との電位差により画素電極端部にて従来生じ
ていたチルトリバースの発生を防止し、表示領域の開口
率の向上を図ると共に、画素電極に生じるディスクリネ
ーションラインの遮蔽も考慮し、鮮明且つコントラスト
比の高い良好な表示画像を得る事ができる液晶表示装置
を提供する事を目的とする。Therefore, the present invention eliminates the above-described problem, prevents the tilt reverse which has conventionally occurred at the end of the pixel electrode due to the potential difference from the scanning line, and improves the aperture ratio of the display area. An object of the present invention is to provide a liquid crystal display device capable of obtaining a clear display image having a high contrast ratio in consideration of the shielding of disclination lines generated in the pixel electrode.
【０００８】[0008]
【課題を解決するための手段】請求項１に記載される液
晶表示装置は、二次元マトリクス状に配置された画素が
第１の画素電極及び第２の画素電極の対からなり、前記
第１の画素電極及び前記第２の画素電極が接続される１
つ又は２つの薄膜トランジスタと、この薄膜トランジス
タに接続される信号線と、この信号線と直交すると共に
前記第１の画素電極及び前記第２の画素電極の境界を通
る様に設けられ前記薄膜トランジスタに接続され走査信
号を供給する走査線とを具備し、前記第１の画素電極上
と前記第２の画素電極上での配向方向が異なる事を特徴
としている。In a liquid crystal display device according to a first aspect of the present invention, the pixels arranged in a two-dimensional matrix form a pair of a first pixel electrode and a second pixel electrode, 1 of which the pixel electrode and the second pixel electrode are connected
One or two thin film transistors, a signal line connected to the thin film transistor, and a signal line that is orthogonal to the signal line and that passes through the boundary between the first pixel electrode and the second pixel electrode and is connected to the thin film transistor. A scanning line for supplying a scanning signal is provided, and the alignment direction on the first pixel electrode is different from that on the second pixel electrode.
【０００９】又他の実施態様としては、蓄積容量線が、
隣接する画素電極との境界に設置される事を特徴として
いる。In another embodiment, the storage capacitance line is
It is characterized in that it is installed at the boundary between adjacent pixel electrodes.
【００１０】[0010]
【作用】上述したように本発明の液晶表示装置によれ
ば、第１及び第２の画素の境界に単一の走査線を設け、
両画素に走査信号を供給する事により、従来走査線を画
素電極端部に設けた場合に生じていた、画素端部のチル
トリバースが小さく成り、ブラックマトリクスで遮蔽す
る必要が無く、従来に比し画素端部における遮蔽手段の
縮小を図れ、画素電極の開口率を向上出来、コントラス
ト比の良い良質の画像表示を得るものである。一方、配
向分割方式を用いる場合、分子配列方向の異なる２つの
領域の境界に生じていたディスクリネーションライン
を、蓄積容量線に代わり走査線により遮蔽することも出
来る。更に、蓄積容量線を画素電極の表示領域内に設け
る事無く、隣接する画素との境界に設置し、開口部の上
下を規定する事により開口率を向上させ、ディスクリネ
ーションによるコントラストの低下を防ぐものである。As described above, according to the liquid crystal display device of the present invention, a single scanning line is provided at the boundary between the first and second pixels,
By supplying the scanning signal to both pixels, the tilt reverse at the pixel end, which occurs when the conventional scanning line is provided at the pixel electrode end, becomes small, and it is not necessary to shield it with the black matrix. However, it is possible to reduce the shielding means at the pixel end portion, improve the aperture ratio of the pixel electrode, and obtain a good-quality image display with a good contrast ratio. On the other hand, when the orientation division method is used, the disclination line generated at the boundary between two regions having different molecular arrangement directions can be shielded by the scanning line instead of the storage capacitance line. Further, the storage capacitance line is not provided in the display area of the pixel electrode, but is installed at the boundary with the adjacent pixel, and the upper and lower sides of the opening are regulated to improve the aperture ratio and reduce the contrast due to disclination. To prevent.
【００１１】[0011]
【実施例】以下、本発明を図１及び図２に示す第１の実
施例を参照して説明する。１０は、ＴＦＴを用いた液晶
表示装置であり、Ｉｎｄｉｕｍ−Ｔｉｎ−Ｏｘｉｄｅ
（以下ＩＴＯと略称する。）からなるマトリクス状の画
素電極２１を有するＴＦＴアレイ基板２０及び、ＩＴＯ
からなる透明電極３１を有する対向基板３０間には、配
向膜１１、１２を介して液晶組成物１３が保持されてい
る。１４は、両基板２０、３０を所定の間隔に制御する
スペーサである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the first embodiment shown in FIGS. Reference numeral 10 denotes a liquid crystal display device using a TFT, which is Indium-Tin-Oxide.
(Hereinafter abbreviated as ITO) TFT array substrate 20 having matrix-shaped pixel electrodes 21 and ITO
The liquid crystal composition 13 is held between the opposing substrates 30 having the transparent electrodes 31 made of (4) through the alignment films 11 and 12. Reference numeral 14 is a spacer for controlling both substrates 20 and 30 at a predetermined interval.
【００１２】次にＴＦＴアレイ基板２０上には信号線２
３及び走査線２４がマトリクス状に配列され各交点部分
にコンタクトホール（図示せず）を介して接続されるア
モルファスシリコンを用いたＴＦＴ２２配置されてい
る。又、走査線２４を挾むようにしてＴＦＴ２２に接続
される画素電極２１が形成されている。この画素電極２
１の一画素は、矢印ｓ方向の配向方向を有する第１の領
域２１ａと、この第１の領域２１ａと１８０°配向方向
が異なる矢印ｔ方向の配向方向を有する第２の領域２１
ｂの対からなっている。Next, the signal line 2 is formed on the TFT array substrate 20.
3 and the scanning lines 24 are arranged in a matrix, and TFTs 22 using amorphous silicon are arranged at the respective intersections and connected through contact holes (not shown). Further, a pixel electrode 21 connected to the TFT 22 is formed so as to sandwich the scanning line 24. This pixel electrode 2
One pixel includes a first region 21a having an alignment direction of an arrow s direction and a second region 21 having an alignment direction of an arrow t direction different from the first region 21a by 180 °.
It consists of b pairs.
【００１３】上述の様に構成されるＴＦＴアレイ基板２
０及び、対向基板３０の表面に夫々ポリイミドからなる
配向膜１１、１２を成膜した後、夫々第１回目のラビン
グ処理を行う。The TFT array substrate 2 constructed as described above
0 and the alignment films 11 and 12 made of polyimide are formed on the surface of the counter substrate 30, respectively, and then the first rubbing process is performed.
【００１４】次にフォトリソグラフィにより、ＴＦＴア
レイ基板２０の走査線２４が配置される位置を境に画素
電極２１の１／２の領域に相当する部分の配向膜１１及
び、透明電極３１側の前述の領域と対向する領域に相当
する位置の配向膜１２をレジストにて被覆し、第１回目
のラビング方向と１８０°方向の異なる第２回目のラビ
ング処理を行う。Next, by means of photolithography, the alignment film 11 and the transparent electrode 31 on the side of the position where the scanning line 24 of the TFT array substrate 20 is arranged, which corresponds to a half region of the pixel electrode 21, are described above. The alignment film 12 at a position corresponding to the region opposite to the region is covered with a resist, and a second rubbing treatment different in 180 ° direction from the first rubbing direction is performed.
【００１５】そしてレジスト剥離後、対向基板３０の配
向膜１２の周辺に沿ってエポキシ系の接着剤１６を注入
口を除いて印刷し、さらに対向基板３０表面に粒径６μ
ｍのスペーサ１４を散布する。After the resist is removed, epoxy adhesive 16 is printed along the periphery of the alignment film 12 of the counter substrate 30 except for the injection port, and the surface of the counter substrate 30 has a grain size of 6 μm.
m spacers 14 are sprinkled.
【００１６】次にＴＦＴアレイ基板２０及び対向基板３
０を、配向膜１１、１２のラビング方向が９０°を成す
ように対向配置した後、加熱し接着剤１６を硬化させ、
両基板２０、３０を張り合わせ液晶セルを作成する。Next, the TFT array substrate 20 and the counter substrate 3
0 is opposed to each other so that the rubbing directions of the alignment films 11 and 12 form 90 °, and then heated to cure the adhesive 16.
Both substrates 20 and 30 are bonded together to form a liquid crystal cell.
【００１７】この後減圧注入法にて、液晶セル中にＥ．
メルク社製ＺＬＩ−１５６５にＳ８１１を０．１wt％添
加した液晶組成物１３を注入後、注入口を紫外線硬化樹
脂で封止する。After that, E.
After injecting the liquid crystal composition 13 in which 0.18% by weight of S811 is added to ZLI-1565 manufactured by Merck, the injection port is sealed with an ultraviolet curable resin.
【００１８】更にＴＦＴアレイ基板２０及び対向基板３
０外側に偏光板１７、１８を貼り合わせ、液晶表示装置
を作製する。Further, the TFT array substrate 20 and the counter substrate 3
Polarizing plates 17 and 18 are attached to the outside of the liquid crystal display device to manufacture a liquid crystal display device.
【００１９】この様に構成すれば、走査線２４の両側に
画素電極２１の第１及び第２の領域２１ａ、２１ｂを設
け、両領域２１ａ、２１ｂに走査信号を供給する事によ
り、従来走査線との電位差により画素電極端部に生じて
いたチルトリバースが無くなり、画素電極端部にあって
は、チルトリバース部分を遮蔽する必要が無くなるの
で、従来に比し、画素電極端部における開口部分を拡大
出来、ひいては、液晶表示装置１０の開口率を拡大出
来、コントラスト比の良い配向分割方式のアクティブマ
トリクス液晶表示装置を得る事が出来る。According to this structure, the first and second regions 21a and 21b of the pixel electrode 21 are provided on both sides of the scanning line 24, and a scanning signal is supplied to both regions 21a and 21b. The tilt reverse generated at the end of the pixel electrode due to the potential difference between and is eliminated, and it is not necessary to shield the tilt reverse part at the end of the pixel electrode. The liquid crystal display device 10 can be enlarged, and thus the aperture ratio of the liquid crystal display device 10 can be enlarged, and an active matrix liquid crystal display device of an alignment division system having a good contrast ratio can be obtained.
【００２０】尚上記実施例にて作製された液晶表示装置
１０の開口率は、走査線を画素電極の端部に設け、蓄積
容量線を画素電極の２領域の境界に設けた従来の装置が
ほぼ４５％であったのに比し、約６０％に向上された。
又、そのコントラスト比は、従来の装置が９０であった
のに比し２００と著しく向上され、良好な表示画像を得
られた。The aperture ratio of the liquid crystal display device 10 manufactured in the above embodiment is the same as that of the conventional device in which the scanning line is provided at the end of the pixel electrode and the storage capacitance line is provided at the boundary between the two regions of the pixel electrode. It was improved to about 60% compared to about 45%.
Further, the contrast ratio was remarkably improved to 200 as compared with 90 in the conventional device, and a good display image was obtained.
【００２１】次に第２の実施例を図３を参照して説明す
る。尚第１の実施例と同一部分については同一符号を付
しその説明を省略する。この第２の実施例は、第１の実
施例と同様のアレイ基板２０上に、第１の実施例と同様
に走査線２４を挾むようにしてＴＦＴ２２に接続される
第１領域２１ａ及び第２の領域２１ｂの対からなる画素
電極２１が形成されると共に、隣接する画素電極２１間
に蓄積容量線を配置するものである。そして第１の実施
例と同様にして、配向膜の塗布、ラビング処理、液晶セ
ルの組立て、液晶組成物の注入を行い液晶表示装置を作
成する。Next, a second embodiment will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the second embodiment, on the array substrate 20 similar to the first embodiment, the first region 21a and the second region 21a and the second region 21a, which are connected to the TFT 22 so as to sandwich the scanning line 24 like the first embodiment, are provided. The pixel electrode 21 formed of a pair of 21b is formed, and the storage capacitance line is arranged between the adjacent pixel electrodes 21. Then, similarly to the first embodiment, application of an alignment film, rubbing treatment, assembling of a liquid crystal cell, and injection of a liquid crystal composition are carried out to prepare a liquid crystal display device.
【００２２】この様に構成すれば、第１の実施例と同
様、走査線２４の両側に設けられる画素電極２１の第１
及び第２の領域２１ａ、２１ｂに走査信号を供給する事
により、従来走査線との電位差により画素電極端部に生
じていたチルトリバースが無くなり、画素電極端部にあ
っては、チルトリバース部分を遮蔽する必要が無くなる
ので、従来に比し画素電極端部における開口部分を拡大
出来、又ディスクリネーションによるコントラストの低
下を防止出来、ひいては、開口率が高く、コントラスト
の高い、配向分割方式のアクティブマトリクス液晶表示
装置を得る事が出来る。According to this structure, as in the first embodiment, the first pixel electrodes 21 provided on both sides of the scanning line 24 are provided.
By supplying the scanning signal to the second regions 21a and 21b, the tilt reverse generated at the end portion of the pixel electrode due to the potential difference from the conventional scanning line is eliminated, and the tilt reverse portion is removed at the end portion of the pixel electrode. Since there is no need to shield, the opening at the edge of the pixel electrode can be enlarged compared to the conventional one, and the reduction in contrast due to disclination can be prevented. As a result, the aperture ratio is high and the contrast is high. A matrix liquid crystal display device can be obtained.
【００２３】尚この第２の実施例にて作製された液晶表
示装置の開口率は、走査線を画素電極の端部に設け、蓄
積容量線を画素電極の２領域の境界に設けた従来の装置
がほぼ４５％であったのに比し、約５０％に向上され
た。又、そのコントラスト比は、従来の装置が９０であ
ったのに比し１５０と著しく向上され、良好な表示画像
を得られた。The aperture ratio of the liquid crystal display device manufactured in the second embodiment is the same as that of the conventional liquid crystal display device in which the scanning line is provided at the end of the pixel electrode and the storage capacitance line is provided at the boundary between the two regions of the pixel electrode. The equipment was improved to approximately 50%, compared to approximately 45%. Further, the contrast ratio was remarkably improved to 150 compared with 90 in the conventional apparatus, and a good display image was obtained.
【００２４】尚本発明は上記実施例に限られるものでな
く、その趣旨を変えない範囲での変更は可能であって、
例えばＴＦＴの材質或いは、画素電極の数、等任意であ
る。更に画素電極中の第１及び第２の領域は夫々配向方
向が異なっていれば、その角度等限定されない。The present invention is not limited to the above-mentioned embodiments, and modifications can be made without departing from the spirit of the invention.
For example, the material of the TFT, the number of pixel electrodes, and the like are arbitrary. Furthermore, the angle and the like of the first and second regions in the pixel electrode are not limited as long as the orientation directions are different.
【００２５】[0025]
【発明の効果】以上説明したように本発明によれば、Ｔ
ＦＴを用いた配向分割方式のアクティブマトリクス液晶
表示装置において、画素電極端部に生じるチルトリバー
スを低減出来る事からその遮蔽手段が不要と成り、画素
電極の開口率を向上することができ、コントラスト比の
高い良好な表示画像を得ることが出来る。As described above, according to the present invention, T
In the active matrix liquid crystal display device of the alignment division type using FT, the tilt reverse generated at the end portion of the pixel electrode can be reduced, so that the shielding means is unnecessary, the aperture ratio of the pixel electrode can be improved, and the contrast ratio can be improved. It is possible to obtain a high quality display image.
【図１】本発明の第１の実施例の液晶表示装置を示す概
略断面図である。FIG. 1 is a schematic cross-sectional view showing a liquid crystal display device of a first embodiment of the present invention.
【図２】本発明の第１の実施例の液晶表示装置のＴＦＴ
アレイ基板を示す概略平面図である。FIG. 2 is a TFT of the liquid crystal display device according to the first embodiment of the present invention.
It is a schematic plan view which shows an array substrate.
【図３】本発明の第２の実施例の液晶表示装置のＴＦＴ
アレイ基板を示す概略平面図である。FIG. 3 is a TFT of a liquid crystal display device according to a second embodiment of the present invention.
It is a schematic plan view which shows an array substrate.
１０…液晶表示装置 ２１…画素電極 ２１ａ…第１の領域 ２１ｂ…第２の領域 ２４…走査線 ２５…蓄積容量線 10 ... Liquid crystal display device 21 ... Pixel electrode 21a ... 1st area | region 21b ... 2nd area | region 24 ... Scan line 25 ... Storage capacity line
Claims (2)
第１の画素電極及び第２の画素電極の対からなり、前記
第１の画素電極及び前記第２の画素電極が接続される１
つ又は２つの薄膜トランジスタと、この薄膜トランジス
タに接続される信号線と、この信号線と直交すると共に
前記第１の画素電極及び前記第２の画素電極の境界を通
る様に設けられ前記薄膜トランジスタに接続され走査信
号を供給する走査線とを具備し、前記第１の画素電極上
と前記第２の画素電極上での配向方向が異なる事を特徴
とする液晶表示装置。1. Pixels arranged in a two-dimensional matrix form a pair of a first pixel electrode and a second pixel electrode, and the first pixel electrode and the second pixel electrode are connected to each other.
One or two thin film transistors, a signal line connected to the thin film transistor, and a signal line that is orthogonal to the signal line and that passes through the boundary between the first pixel electrode and the second pixel electrode and is connected to the thin film transistor. A liquid crystal display device, comprising: a scanning line for supplying a scanning signal, wherein the alignment directions on the first pixel electrode and the second pixel electrode are different.
蓄積容量線が、隣接する画素電極との境界に設置される
事を特徴とする液晶表示装置。2. The liquid crystal display device according to claim 1, wherein
A liquid crystal display device, wherein a storage capacitor line is installed at a boundary between adjacent pixel electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19311595A JPH0943610A (en) | 1995-07-28 | 1995-07-28 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19311595A JPH0943610A (en) | 1995-07-28 | 1995-07-28 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0943610A true JPH0943610A (en) | 1997-02-14 |
Family
ID=16302511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19311595A Pending JPH0943610A (en) | 1995-07-28 | 1995-07-28 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0943610A (en) |
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