JPH095709A - Liquid crystal display device and its driving method - Google Patents
Liquid crystal display device and its driving methodInfo
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- JPH095709A JPH095709A JP15204995A JP15204995A JPH095709A JP H095709 A JPH095709 A JP H095709A JP 15204995 A JP15204995 A JP 15204995A JP 15204995 A JP15204995 A JP 15204995A JP H095709 A JPH095709 A JP H095709A
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、反強誘電相と強誘電相
とを取る強誘電性液晶を用いた液晶表示装置及びその駆
動方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device using a ferroelectric liquid crystal having an antiferroelectric phase and a ferroelectric phase, and a driving method thereof.
【0002】[0002]
【従来の技術】電界によって3つの光学状態を取る液晶
表示装置が特開平2−153322号、特開平2−17
3724号などに開示されている。その後これが液晶の
反強誘電性によるものであることがChandani等
(ジャパニーズ・ジャーナル・オブ・アプライド・フィ
ジクス28巻(1989)L1265頁)によって明ら
かにされた。2. Description of the Related Art Liquid crystal display devices that take three optical states by an electric field are disclosed in Japanese Patent Laid-Open Nos. 2-153322 and 2-17.
No. 3724 and the like. It was subsequently revealed by Chandani et al. (Japanese Journal of Applied Physics 28 (1989) L1265 page) that this is due to the antiferroelectricity of liquid crystals.
【0003】それによると、反強誘電性を示す強誘電性
液晶(以下反強誘電性液晶という)は通常の強誘電性液
晶と同じく薄い基板間隙中でらせんが解けて、図6
(a)に示すように無電界時(E=0)には液晶分子が
スメクティック層毎に反対方向にチルトした構造をと
り、そのため無電界時には光軸は層法線方向を向く。According to this, a ferroelectric liquid crystal exhibiting antiferroelectricity (hereinafter referred to as antiferroelectric liquid crystal) unwinds a helix in a thin substrate gap as in a normal ferroelectric liquid crystal.
As shown in (a), when there is no electric field (E = 0), liquid crystal molecules are tilted in opposite directions for each smectic layer. Therefore, when there is no electric field, the optical axis is oriented in the layer normal direction.
【0004】電界印加(E>0、E<0)によって強誘
電相への転移が起こり、液晶分子がすべての層で電界の
方向によって決まる同一方向にチルトした構造をとる結
果、光軸は層法線から傾き層法線に対して対称な2つの
方向のいずれかになる。これを図6(b),(c)に示
した。The transition to the ferroelectric phase occurs due to the application of an electric field (E> 0, E <0), and the liquid crystal molecules have a structure in which all layers are tilted in the same direction determined by the direction of the electric field. It is one of two directions that are symmetric from the normal to the tilted layer normal. This is shown in FIGS. 6 (b) and 6 (c).
【0005】この反強誘電性液晶を表示装置に応用する
場合は通常2枚の偏光板で挟み、図6中に両矢印線で示
したように偏光板の吸収軸を層法線に平行および垂直
に、2枚の偏光板がクロスニコルとなるように配置す
る。この配置では、無電界時の反強誘電状態が暗状態、
電界印加時の強誘電状態が明状態となる。When this antiferroelectric liquid crystal is applied to a display device, it is usually sandwiched between two polarizing plates, and the absorption axis of the polarizing plate is parallel to the layer normal as indicated by the double-headed arrow line in FIG. The two polarizing plates are arranged vertically so as to form a crossed Nicols. In this arrangement, the antiferroelectric state when there is no electric field is the dark state,
The ferroelectric state when the electric field is applied becomes the bright state.
【0006】この配置の特徴は明状態が2通りあること
で、これを利用して一定周期ごとに明状態の印加電圧極
性を切り替える方法が上記特開平2−173724号に
開示されている。該発明は単純マトリクス構成での反強
誘電性液晶装置の発明であって図7にその駆動波形の一
例を示す。The feature of this arrangement is that there are two bright states, and a method of switching the polarity of the applied voltage in the bright state at regular intervals using this is disclosed in Japanese Patent Laid-Open No. 2-173724. The invention is an invention of an anti-ferroelectric liquid crystal device having a simple matrix structure, and FIG. 7 shows an example of its drive waveform.
【0007】図7は液晶にかかる電圧の時間変動の様子
を示すもので、フレームごとに画素に印加される電圧の
極性が入れ替わっている。図7から明らかなとおり液晶
にかかる電圧は時間的に平均化されて0になる。これに
よりDC電圧成分による液晶の劣化を防止できるという
利点がある。FIG. 7 shows how the voltage applied to the liquid crystal changes with time, and the polarities of the voltages applied to the pixels are changed every frame. As is clear from FIG. 7, the voltage applied to the liquid crystal is averaged over time and becomes zero. This has the advantage of preventing deterioration of the liquid crystal due to the DC voltage component.
【0008】[0008]
【発明が解決しようとする課題】しかしながら、上記の
フレームごとの極性反転駆動法には欠点があって、それ
は表示パネルを斜めから見たときに画面がちらつくとい
うことである。その理由を以下で説明する。However, the above-mentioned frame-by-frame polarity inversion drive method has a drawback that the screen flickers when the display panel is viewed from an oblique direction. The reason will be described below.
【0009】図8は表示パネルを右斜め下から見たとき
の液晶分子と上下の偏光板の透過軸とを示したものであ
る。(a)は暗状態、(b),(c)は2つの明状態
で、それぞれを正面から見たのが図6の(a),
(b),(c)に対応する。FIG. 8 shows liquid crystal molecules and the transmission axes of the upper and lower polarizing plates when the display panel is viewed from the lower right. (A) is a dark state, (b) and (c) are two bright states, each of which is viewed from the front is shown in FIG.
It corresponds to (b) and (c).
【0010】(b)と(c)をくらべると(b)では液
晶分子をほぼ真横から見ているので実効的な屈折率異方
性は正面から見た場合とあまり違わないのに対し、
(c)では液晶分子をその長軸近くから見ていることに
なり、正面から見るのと比べて屈折率異方性が著しく小
さくなる。そのために(b)と(c)では透過率に差が
生じ、これがフレームごとに切り替わるのでちらつきと
して見えるのである。Comparing (b) and (c), in (b), the liquid crystal molecules are viewed almost from the side, so the effective refractive index anisotropy is not much different from that when viewed from the front.
In (c), the liquid crystal molecules are viewed from the vicinity of their major axes, and the refractive index anisotropy is significantly smaller than when viewed from the front. Therefore, there is a difference in transmittance between (b) and (c), and this is switched for each frame, so that it appears as a flicker.
【0011】さらに斜めから見ると光路長が長くなるの
で(b)の場合リタデーションが最適値からずれ、黄色
く色づいて見えるのもちらつきの一因である。Further, since the optical path length becomes long when viewed obliquely, in the case of (b), the retardation deviates from the optimum value, which is one of the causes of the flicker that the yellow color appears.
【0012】本発明は、表示パネルを真横側から見ても
ちらつきの少ない、反強誘電性液晶を用いた液晶表示装
置及びその駆動方法の提供を目的としている。It is an object of the present invention to provide a liquid crystal display device using an antiferroelectric liquid crystal, which has little flicker even when the display panel is viewed from the side, and a driving method thereof.
【0013】[0013]
【課題を解決するための手段】本発明は、互いに直交す
る走査信号電極と情報信号電極の交差によって形成され
たマトリクス画素を有する表示パネルと、前記2つの電
極の間隙にあって、無電界時に反強誘電相からなる第1
の安定状態を取り、電界印可時に電界の極性に応じて強
誘電相からなる第2又は第3の安定状態を取る強誘電性
液晶と、上記第1の安定状態を暗状態、第2及び第3の
状態を明状態とする偏光装置とを備えた液晶表示装置に
おいて、上記各画素を少なくとの2つ以上の副画素で構
成すると共に、対応する走査電極を配置して、駆動装置
により、画素が明状態を取るとき該画素の1方の副画素
が第2の安定状態を取ると、他方の副画素が第3の安定
状態となるようにしたことをを特徴としている。According to the present invention, there is provided a display panel having a matrix pixel formed by intersections of scanning signal electrodes and information signal electrodes which are orthogonal to each other, and in a gap between the two electrodes, there is no electric field. First composed of antiferroelectric phase
And a ferroelectric liquid crystal that takes a second or third stable state consisting of a ferroelectric phase according to the polarity of the electric field when an electric field is applied, and the first stable state is the dark state, the second and the third stable state. In a liquid crystal display device including a polarizing device that brings the state 3 into a bright state, each pixel is configured by at least two or more sub-pixels, and corresponding scanning electrodes are arranged, and a driving device is provided. It is characterized in that, when one sub-pixel of the pixel takes the second stable state when the pixel takes the bright state, the other sub-pixel becomes the third stable state.
【0014】また、本発明は、上記液晶表示装置の駆動
方法であって、画像信号が少なくとも1つずつの正及び
負の電圧パルスを含む交流信号からなり、一方の電圧パ
ルスに同期した第1の選択電圧によって一方の走査信号
電極を選択し、他方の電圧パルスに同期した前記第1の
選択電圧とは逆極性の第2の選択電圧によって他方の走
査信号電極を選択することにより副画素の状態を決定す
るようにしたことを特徴としている。The present invention is also the method for driving a liquid crystal display device as described above, wherein the image signal is an AC signal including at least one positive voltage pulse and one negative voltage pulse, and the image signal is synchronized with one voltage pulse. Of the sub-pixels by selecting one of the scanning signal electrodes with the second selection voltage having a polarity opposite to that of the first selection voltage synchronized with the voltage pulse of the other and selecting the other scanning signal electrode. The feature is that the state is decided.
【0015】[0015]
【作用】本発明は上述のように構成されているので、画
素が明状態の時、1画素内に2つの状態が混在して、フ
レーム毎に入れ替わるので、透過率差と色づきの差が平
均化されちらつきのない高品質の表示となる。Since the present invention is configured as described above, when a pixel is in a bright state, two states coexist in one pixel and are switched for each frame. Therefore, the difference in transmittance and the difference in coloring are averaged. High quality display without flicker.
【0016】[0016]
【実施例】以下、図面に基づき本発明の第1の実施例に
ついて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.
【0017】図1はいずれも表示パネルの一部分を取り
出して示したもので、11、12は走査信号電極(以
下、単に走査線とする。)、13は情報信号電極(以
下、単に信号線とする。)、14、15は画素電極であ
る。走査線と画素電極は一方の基板上に、信号線は他方
の基板上に形成されている。画素電極内の短い線分はそ
の画素での液晶の光軸方向をあらわしたもので、信号線
に平行なものは反強誘電(暗)状態、傾いているものは
強誘電(明)状態を示している。16、17は上下の偏
光板の軸方向である。なお、ここでは便宜上信号線を層
法線方向としておくが、これは必ずしも必要でなく任意
の方向であってよい。FIG. 1 shows a part of the display panel taken out and shown, in which 11 and 12 are scanning signal electrodes (hereinafter simply referred to as scanning lines) and 13 are information signal electrodes (hereinafter simply referred to as signal lines). , 14 and 15 are pixel electrodes. The scanning line and the pixel electrode are formed on one substrate, and the signal line is formed on the other substrate. The short line segment in the pixel electrode shows the optical axis direction of the liquid crystal in the pixel, the one parallel to the signal line shows the antiferroelectric (dark) state, and the inclined one shows the ferroelectric (bright) state. Shows. Reference numerals 16 and 17 are the axial directions of the upper and lower polarizing plates. Note that, here, for convenience, the signal line is set to the layer normal direction, but this is not always necessary and may be an arbitrary direction.
【0018】図に示すように、1画素は2つの画素電極
14、15で構成されており、それぞれが副画素を構成
している。画素が暗状態にあるときは2つの副画素はと
もに反強誘電状態にあり、光軸は偏光板の軸方向を向い
ている。明状態では2つの副画素は互いに逆のチルトの
強誘電状態をとる。各副画素は従来と同じくフレームご
とに極性を反転させて駆動されるので、あるフレームで
第1の副画素が右チルト、第2の副画素が左チルトであ
るとすると、次のフレームでは第1の副画素が左チル
ト、第2の副画素が右チルトになる。As shown in the figure, one pixel is composed of two pixel electrodes 14 and 15, each of which constitutes a sub-pixel. When the pixel is in the dark state, both of the two subpixels are in the antiferroelectric state, and the optical axis is in the axial direction of the polarizing plate. In the bright state, the two sub-pixels are in a ferroelectric state with tilts opposite to each other. Since each sub-pixel is driven by reversing the polarity for each frame as in the conventional case, if the first sub-pixel is right tilted and the second sub-pixel is left tilted in one frame, the next sub-frame is The first subpixel has a left tilt, and the second subpixel has a right tilt.
【0019】2つの副画素が互いに逆の明状態をとるの
で、明状態領域が透過率と色づきの異なる2状態混成と
なり、目には平均的な透過率と色づきとして見える。し
たがってフレーム間の差はなくなりちらつきが発生しな
い。Since the two sub-pixels have light states opposite to each other, the bright-state region is a two-state mixture in which the transmittance and the coloring are different, and the eyes see the average transmittance and the coloring. Therefore, there is no difference between frames and no flicker occurs.
【0020】図2は図1の各電極を駆動する電圧の時間
的タイミングを示すものである。51a、51b、52
a、52b、・・・は走査線印加電圧、53、54は信
号線印加電圧、55は51aと53の交点の副画素に印
加される合成電圧、56は51bと53の交点の副画素
に印加される合成電圧、57は51aと54の交点の副
画素に印加される合成電圧、58は51bと54の交点
の副画素に印加される合成電圧である。FIG. 2 shows the timing of the voltage driving each electrode of FIG. 51a, 51b, 52
a is a scanning line applied voltage, 53 and 54 are signal line applied voltages, 55 is a composite voltage applied to the sub-pixel at the intersection of 51a and 53, and 56 is a sub-pixel at the intersection of 51b and 53. The composite voltage applied, 57 is the composite voltage applied to the subpixel at the intersection of 51a and 54, and 58 is the composite voltage applied to the subpixel at the intersection of 51b and 54.
【0021】走査線はマトリクス画素配列の各ラインご
とに2本あり、a、bで区別されている。選択期間Tの
直前に0ボルトのリセット期間Rがあり、ライン上の全
画素を暗状態にリセットする。選択後の非選択期間Nに
は書き込んだ状態を維持するめのDC電圧(バイアス電
圧)が印加される。There are two scanning lines for each line of the matrix pixel array, which are distinguished by a and b. Immediately before the selection period T, there is a reset period R of 0 volt, and all the pixels on the line are reset to the dark state. In the non-selected period N after selection, a DC voltage (bias voltage) for maintaining the written state is applied.
【0022】2種類の走査線a、bはそれぞれ第1の副
画素と第2の副画素に接続されていて、画像信号の1単
位期間内H内に順次選択される。The two types of scanning lines a and b are connected to the first subpixel and the second subpixel, respectively, and are sequentially selected within H within one unit period of the image signal.
【0023】奇数フレームではaの走査線に正、bの走
査線に負の選択電圧が各々の選択期間に印加され、それ
に同期して信号線に画像信号に応じて正・負または負・
正の交流信号電圧が印加される。信号線電圧が正・負の
ときは、55、56に示すように走査線電圧と合成され
て両副画素にかかる電圧は閾値以下になり、直前のリセ
ット(暗)状態が維持される。一方、信号線電圧が負・
正のときは57、58に示すように走査線電圧と合成さ
れて画素にかかる電圧は両副画素とも閾値以上になり、
第1の副画素には一方の明状態が書き込まれ、第2の副
画素には他方の明状態が書き込まれる。以下、この操作
をラインごとに繰り返して1フレームを完成する。In the odd-numbered frame, a positive selection voltage is applied to the scanning line a and a negative selection voltage is applied to the scanning line b in each selection period, and in synchronization therewith, positive / negative or negative / negative signals are applied to the signal line in accordance with the image signal.
A positive AC signal voltage is applied. When the signal line voltage is positive or negative, the voltage applied to both sub-pixels by being combined with the scanning line voltage becomes less than or equal to the threshold value as indicated by 55 and 56, and the immediately preceding reset (dark) state is maintained. On the other hand, the signal line voltage is negative
When it is positive, the voltage combined with the scanning line voltage and applied to the pixel becomes higher than the threshold value for both sub-pixels, as indicated by 57 and 58.
One bright state is written to the first subpixel, and the other bright state is written to the second subpixel. Hereinafter, this operation is repeated for each line to complete one frame.
【0024】偶数フレームでは、図2に示すように走査
線電圧の極性がa、bともに逆転され、信号線電圧の極
性も反転される。したがって明画素は奇数フレームと逆
極性の合成電圧で書き込まれ、チルト状態が反転する。In the even-numbered frame, the polarities of the scanning line voltage are reversed for both a and b as shown in FIG. 2, and the polarities of the signal line voltages are also reversed. Therefore, the bright pixel is written with a composite voltage having a polarity opposite to that of the odd frame, and the tilt state is inverted.
【0025】次に、本発明の第2の実施例について説明
する。Next, a second embodiment of the present invention will be described.
【0026】図3はその実施形態を示すものである。6
1−64は走査電極、65R、66R、65G、66
G、65B、66Bは信号線、67、68は画素電極で
ある。走査電極は一方の基板上、信号線と画素電極は他
方の基板上に形成されている。1画素は図の点線で囲ん
だ領域69で、2本の走査電極に跨がっている。1つの
画素はカラーフィルタ(図示せず)によって赤R、緑
G、青Bの3領域に細分されているいるほかに、走査電
極によって2分され、計6つの副画素から構成される。
ただし、信号線は1つの画素についてはRGBの3本
で、上下にとなりあう画素については別の信号線になっ
ている。FIG. 3 shows the embodiment. 6
1-64 are scan electrodes, 65R, 66R, 65G, 66
G, 65B and 66B are signal lines, and 67 and 68 are pixel electrodes. The scanning electrodes are formed on one substrate, and the signal lines and the pixel electrodes are formed on the other substrate. One pixel is a region 69 surrounded by a dotted line in the drawing and extends over two scan electrodes. One pixel is subdivided into three regions of red R, green G, and blue B by a color filter (not shown), and is divided into two by a scanning electrode, and is composed of a total of six subpixels.
However, there are three signal lines of RGB for one pixel and another signal line for pixels that are vertically aligned.
【0027】図4に、図3の各信号線、各走査線に印加
される電圧の時間的タイミングを示す。71−74はそ
れぞれ図3の61−64の走査電極に印加される電圧、
75R、76Rは信号線65R、66Rに印加される電
圧である。77は71と75Rの合成電圧で、図3のa
の副画素に印加され、78は72と75Rの合成電圧
で、図3のbの副画素に印加される。また79は71と
76Rの合成電圧で、一つ上の画素に属する副画素(図
3のc)に印加される電圧を示している。FIG. 4 shows the timing of the voltage applied to each signal line and each scanning line in FIG. 71-74 are voltages applied to the scan electrodes 61-64 of FIG. 3, respectively,
75R and 76R are voltages applied to the signal lines 65R and 66R. Reference numeral 77 is a composite voltage of 71 and 75R, which is a in FIG.
3 is a combined voltage of 72 and 75R, which is applied to the sub-pixel of b in FIG. Further, 79 is a composite voltage of 71 and 76R, and shows the voltage applied to the sub-pixel (c in FIG. 3) belonging to the pixel one above.
【0028】走査線選択期間Tの直前に0ボルトのリセ
ット期間Rがあり、ライン上の全画素を暗状態にリセッ
トする。選択後の非選択期間Nには書き込んだ状態を維
持するためのDC電圧が印加される。これらは第1のと
同様である。Immediately before the scanning line selection period T, there is a reset period R of 0 volt, and all the pixels on the line are reset to the dark state. A DC voltage for maintaining the written state is applied in the non-selected period N after the selection. These are similar to the first.
【0029】走査線は1本づつ極性を交互に反転させな
がら選択される。71の選択期間には正の選択電圧が供
給され、次いで72の選択期間に負の選択電圧が供給さ
れる。これに同期した期間H内に信号線65Rに75R
に示すような負・正の交流電圧が印加されると、a、b
の副画素にそれぞれ正・負の閾値以上の電圧がかかり逆
方向のチルトを持つ明状態が書き込まれる。暗状態を書
き込む場合は逆相(正・負)の交流電圧を65Rに与え
ればよい。The scanning lines are selected by alternately inverting the polarities one by one. A positive selection voltage is supplied during the selection period 71, and then a negative selection voltage is supplied during the selection period 72. 75R on the signal line 65R within the period H synchronized with this
When a negative / positive AC voltage as shown in Fig.
Voltages above the positive and negative thresholds are applied to the sub-pixels, and a bright state having a tilt in the opposite direction is written. When writing the dark state, it is sufficient to apply a reverse phase (positive / negative) AC voltage to 65R.
【0030】なお、71の選択期間とその直前の1つ上
の走査線(図示せず)選択期間に同期して、信号線66
Rには図4のH′に示す別の交流信号76Rが印加され
て図3cの副画素を含む画素の状態が決定される。ま
た、72の選択期間とその直後の1つ下の走査線63の
選択期間に同期して、信号線66Rにはさらに次の交流
信号が印加されて図3dの副画素を含む画素の状態が決
定される。このように、信号線65Rと66Rとには位
相が反周期ずれた交流画像信号が供給される。Incidentally, the signal line 66 is synchronized with the selection period of 71 and the selection period immediately preceding by one scanning line (not shown).
Another AC signal 76R shown at H'in FIG. 4 is applied to R to determine the state of the pixel including the sub-pixel in FIG. 3c. Further, in synchronization with the selection period of 72 and the selection period of the scanning line 63 immediately below that immediately after that, the next AC signal is further applied to the signal line 66R, and the state of the pixel including the sub-pixel of FIG. It is determined. In this way, the alternating-current image signals whose phases are shifted by the anti-cycle are supplied to the signal lines 65R and 66R.
【0031】他の信号線65G、66G、65B、66
Bにも同様にしてその色に応じた電圧信号が供給され
る。Other signal lines 65G, 66G, 65B, 66
Similarly, a voltage signal corresponding to the color is supplied to B as well.
【0032】以上のように走査線が順次選択されて1画
面が書き込まれ1つのフレームが終了する。次いですべ
ての極性が反転した電圧信号が同様に印加されて次のフ
レームが書き込まれる。As described above, the scanning lines are sequentially selected, one screen is written, and one frame is completed. Then, a voltage signal with all polarities reversed is applied in the same manner to write the next frame.
【0033】本実施例は画素を2分しそれぞれを異なる
走査電極で駆動する点で第1の実施例と同じであるが、
信号線方向に隣接する画素の副画素が走査電極を共通に
するので走査線本数は実施例1の半分になり、走査時間
も半分ですむ。その代わり信号線の本数が2倍に増え
る。This embodiment is the same as the first embodiment in that the pixel is divided into two and each is driven by different scanning electrodes.
Since the sub-pixels of the pixels adjacent in the signal line direction share the scanning electrode, the number of scanning lines is half that of the first embodiment, and the scanning time is half. Instead, the number of signal lines is doubled.
【0034】なお、本実施例で用いられる反強誘電性液
晶材料としては、化1に示す。The antiferroelectric liquid crystal material used in this embodiment is shown in Chemical formula 1.
【0035】[0035]
【化1】 次に、具体的なセル構成について説明する。Embedded image Next, a specific cell configuration will be described.
【0036】上に述べた液晶を、対向面に電極を形成し
た2枚の透明基板の間隙(ギャップ2.5μm)に挟ん
で表示パネルを作った。A display panel was prepared by sandwiching the above-mentioned liquid crystal in a gap (gap 2.5 μm) between two transparent substrates having electrodes formed on opposite surfaces.
【0037】図5に第2の実施例に用いたパネルの断面
を示す。FIG. 5 shows a cross section of the panel used in the second embodiment.
【0038】一方の基板81は走査線電極82が形成さ
れ、その上にナイロン薄膜83(厚さ5nm)をラビン
グした層が覆っている。ナイロンの代わりにポリイミド
を用いることもできる。A scanning line electrode 82 is formed on one substrate 81, and a layer formed by rubbing a nylon thin film 83 (thickness: 5 nm) is covered on the scanning line electrode 82. Polyimide may be used instead of nylon.
【0039】他方の基板84は、カラーフィルタ85
R、85G、85B、信号線86と画素電極87、その
上には基板間の短絡防止のため、酸化チタンと酸化ジル
コニウムの混合膜88が形成され、さらにその上をシロ
キサンを主成分とする表面処理膜89が厚さ10nm以
下で覆っている。The other substrate 84 has a color filter 85.
R, 85G, 85B, the signal line 86 and the pixel electrode 87, and a mixed film 88 of titanium oxide and zirconium oxide is formed on the signal line 86 and the pixel electrode 87 to prevent a short circuit between the substrates, and a surface mainly containing siloxane is formed on the mixed film 88. The treatment film 89 covers the film with a thickness of 10 nm or less.
【0040】この表面処理膜は対向側のラビング膜に比
べて表面エネルギが小さく、したがって液晶をホモジニ
アス配向させる力が弱い。そのため液晶が等方層からの
冷却によってスメクティック相秩序がラビング膜面側か
ら優先的に起こり、両面から無秩序に起こることによっ
て生じる配向欠陥がなく、結果として均一な配向が得ら
れる。This surface-treated film has a smaller surface energy than the rubbing film on the opposite side, and therefore has a weaker force for homogeneously aligning the liquid crystal. Therefore, when liquid crystal is cooled from the isotropic layer, smectic phase ordering occurs preferentially from the rubbing film surface side, and there is no alignment defect caused by random ordering from both surfaces, and as a result, uniform alignment is obtained.
【0041】[0041]
【発明の効果】以上説明したように、本発明によると、
各々の画素は少なくとも2つの副画素からなり、画素が
明状態をとるとき、該画素の一つの副画素が第2の安定
状態、別の一つの副画素が第3の安定状態となるように
したので、画像のちらつきが少なくできると共に、斜め
から見たときの透過率と色合いの差もなくなり、全体と
して視角特性も向上する。As described above, according to the present invention,
Each pixel consists of at least two sub-pixels, so that when the pixel is in the bright state, one sub-pixel of the pixel is in the second stable state and another one is in the third stable state. Therefore, the flicker of the image can be reduced, the difference between the transmittance and the hue when viewed from an angle is eliminated, and the viewing angle characteristics are improved as a whole.
【図1】本発明の第1の実施例を示す図である。FIG. 1 is a diagram showing a first embodiment of the present invention.
【図2】第1の実施例の各電極印可電圧と画素にかかる
合成電圧を示した図である。FIG. 2 is a diagram showing a voltage applied to each electrode and a combined voltage applied to a pixel in the first embodiment.
【図3】本発明の第2の実施例を示す図である。FIG. 3 is a diagram showing a second embodiment of the present invention.
【図4】第2の実施例の各電極印可電圧と画素にかかる
合成電圧を示した図である。FIG. 4 is a diagram showing each electrode applied voltage and a composite voltage applied to a pixel in the second embodiment.
【図5】第2の実施例の液晶表示装置の断面図である。FIG. 5 is a sectional view of a liquid crystal display device according to a second embodiment.
【図6】反強誘電相と強誘電相の液晶分子配列を示した
図である。FIG. 6 is a diagram showing alignment of liquid crystal molecules in an antiferroelectric phase and a ferroelectric phase.
【図7】液晶表示素子の駆動方法の従来例を示した図で
ある。FIG. 7 is a diagram showing a conventional example of a driving method of a liquid crystal display element.
【図8】図6の状態を斜めから見た図である。FIG. 8 is a diagram showing the state of FIG. 6 as viewed obliquely.
11 走査信号電極 12 走査信号電極 13 情報信号電極 14 副画素電極 15 副画素電極 11 scanning signal electrode 12 scanning signal electrode 13 information signal electrode 14 sub-pixel electrode 15 sub-pixel electrode
Claims (2)
電極の交差によって形成されたマトリクス画素を有する
表示パネルと、前記2つの電極の間隙にあって、無電界
時に反強誘電相からなる第1の安定状態を取り、電界印
可時に電界の極性に応じて強誘電相からなる第2又は第
3の安定状態を取る強誘電性液晶と、上記第1の安定状
態を暗状態、第2及び第3の状態を明状態とする偏光装
置とを備えた液晶表示装置において、 上記各画素を少なくとの2つ以上の副画素で構成すると
共に、対応する走査電極を配置して、駆動装置により、
画素が明状態を取るとき該画素の1方の副画素が第2の
安定状態を取ると、他方の副画素が第3の安定状態とな
るようにしたことをを特徴とする液晶表示装置。1. A display panel having a matrix pixel formed by intersections of scanning signal electrodes and information signal electrodes which are orthogonal to each other, and a first panel formed of an antiferroelectric phase in a gap between the two electrodes when no electric field is applied. And a ferroelectric liquid crystal that takes a second or third stable state consisting of a ferroelectric phase according to the polarity of the electric field when an electric field is applied, and the first stable state is the dark state, the second and the third stable state. In a liquid crystal display device including a polarizing device that brings the state 3 into a bright state, each pixel is configured by at least two or more sub-pixels, and corresponding scanning electrodes are arranged, and a driving device is provided.
A liquid crystal display device, characterized in that, when one sub-pixel of the pixel is in a second stable state when the pixel is in a bright state, the other sub-pixel is in a third stable state.
負の電圧パルスを含む交流信号からなり、一方の電圧パ
ルスに同期した第1の選択電圧によって一方の走査信号
電極を選択し、他方の電圧パルスに同期した前記第1の
選択電圧とは逆極性の第2の選択電圧によって他方の走
査信号電極を選択することにより副画素の状態を決定す
るようにしたことを特徴とする請求項1記載の液晶表示
装置を駆動する駆動方法。2. The image signal is composed of an alternating current signal including at least one positive voltage pulse and one negative voltage pulse, and one scanning signal electrode is selected by a first selection voltage synchronized with one voltage pulse, and the other scanning signal electrode is selected. 2. The state of the sub-pixel is determined by selecting the other scanning signal electrode by a second selection voltage having a polarity opposite to that of the first selection voltage synchronized with the voltage pulse. A driving method for driving the liquid crystal display device described.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15204995A JP3160493B2 (en) | 1995-06-19 | 1995-06-19 | Liquid crystal display |
US08/665,947 US6061045A (en) | 1995-06-19 | 1996-06-19 | Liquid crystal display apparatus and method of driving same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15204995A JP3160493B2 (en) | 1995-06-19 | 1995-06-19 | Liquid crystal display |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH095709A true JPH095709A (en) | 1997-01-10 |
JP3160493B2 JP3160493B2 (en) | 2001-04-25 |
Family
ID=15531940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15204995A Expired - Fee Related JP3160493B2 (en) | 1995-06-19 | 1995-06-19 | Liquid crystal display |
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Country | Link |
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JP (1) | JP3160493B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007025691A (en) * | 2005-07-18 | 2007-02-01 | Samsung Electronics Co Ltd | Liquid crystal display and driving method therefor |
KR101230306B1 (en) * | 2006-02-02 | 2013-02-06 | 삼성디스플레이 주식회사 | Driving apparatus for display device and display device including the same |
US10217425B2 (en) | 2013-11-08 | 2019-02-26 | Seiko Epson Corporation | Driving method of electro-optical device, electro-optical device and electronic apparatus |
CN114863871A (en) * | 2022-05-17 | 2022-08-05 | 昆山国显光电有限公司 | Display panel, driving method thereof and display device |
-
1995
- 1995-06-19 JP JP15204995A patent/JP3160493B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007025691A (en) * | 2005-07-18 | 2007-02-01 | Samsung Electronics Co Ltd | Liquid crystal display and driving method therefor |
KR101230306B1 (en) * | 2006-02-02 | 2013-02-06 | 삼성디스플레이 주식회사 | Driving apparatus for display device and display device including the same |
US10217425B2 (en) | 2013-11-08 | 2019-02-26 | Seiko Epson Corporation | Driving method of electro-optical device, electro-optical device and electronic apparatus |
CN114863871A (en) * | 2022-05-17 | 2022-08-05 | 昆山国显光电有限公司 | Display panel, driving method thereof and display device |
CN114863871B (en) * | 2022-05-17 | 2024-02-27 | 昆山国显光电有限公司 | Display panel, driving method thereof and display device |
Also Published As
Publication number | Publication date |
---|---|
JP3160493B2 (en) | 2001-04-25 |
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