JP2007178907A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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JP2007178907A
JP2007178907A JP2005379830A JP2005379830A JP2007178907A JP 2007178907 A JP2007178907 A JP 2007178907A JP 2005379830 A JP2005379830 A JP 2005379830A JP 2005379830 A JP2005379830 A JP 2005379830A JP 2007178907 A JP2007178907 A JP 2007178907A
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electrode
liquid crystal
display device
crystal display
viewing angle
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Japanese (ja)
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Hidefumi Yamashita
英文 山下
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LG Display Co Ltd
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LG Philips LCD Co Ltd
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Priority to JP2005379830A priority Critical patent/JP2007178907A/en
Priority to KR1020060041800A priority patent/KR20070070015A/en
Priority to US11/642,954 priority patent/US7667808B2/en
Priority to CNA2006101699358A priority patent/CN1991466A/en
Publication of JP2007178907A publication Critical patent/JP2007178907A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133738—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homogeneous alignment
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device having an FFS (fringe field switching) structure achieving a wide viewing angle, particularly a liquid crystal display device having a viewing angle control function of increasing a viewing angle when sharing displayed information and of narrowing a viewing angle when privatizing information. <P>SOLUTION: The liquid crystal display device has an FFS structure generating a lateral electric field between a first electrode 11 and a second electrode 12 on a first substrate 10, wherein a third electrode 21 for generating a vertical electric field with the first electrode 11 and the second electrode 12, is arranged on a second substrate 20 opposing to the first substrate 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、視野角制御を可能とする液晶表示装置に関し、特に、ＦＦＳ（Ｆｒｉｎｇｅ Ｆｉｅｌｄ Ｓｗｉｔｃｈｉｎｇ）方式において、縦電界の制御により視野角制御を行う液晶表示装置に関する。   The present invention relates to a liquid crystal display device that enables viewing angle control, and more particularly to a liquid crystal display device that performs viewing angle control by controlling a vertical electric field in a FFS (Fringe Field Switching) method.

液晶表示装置、特にＴＦＴ（Ｔｈｉｎ Ｆｉｌｍ Ｔｒａｎｓｉｓｔｏｒ：薄膜トランジスタ）を用いた液晶表示装置が、広く携帯電話から大型テレビにまで採用されている。このような中で、個人的に使用するような表示装置にあっては、使用している本人には見えるが、横から覗き込んでも見えないような表示装置が要求されている。特に、ある時には表示画面を多人数で共有し、ある時には個人でのみ使用できるようなものが望まれている。   2. Description of the Related Art Liquid crystal display devices, particularly liquid crystal display devices using TFTs (Thin Film Transistors), are widely used in mobile phones and large-sized televisions. Under such circumstances, a display device that can be used personally is required to be a display device that can be seen by the person who is using it but cannot be seen even when looking from the side. In particular, a display screen that is shared by a large number of people at a certain time and can be used only by an individual at a certain time is desired.

従来、視野角特性を向上するための技術が種々検討されている（例えば、特許文献１参照）。また、視野角特性を向上するためにＦＦＳ技術が考案され、現在、さまざまな製品として量産されている。図８は、従来技術のＦＦＳ構造を示す図である。図８に示すように、ＦＦＳ構造においては、同一基板上に絶縁膜を介し第１の電極１１および第２の電極１２が形成され、それらの電極間に電界を掛けることで液晶を応答させ、階調表示を行っている。実際に、同一基板上に電極を形成しているために、基板に平行な電界成分が大きく、結果的に視野角の広い特性を得ることができている。   Conventionally, various techniques for improving viewing angle characteristics have been studied (see, for example, Patent Document 1). In addition, FFS technology has been devised to improve viewing angle characteristics, and is currently mass-produced as various products. FIG. 8 is a diagram showing a conventional FFS structure. As shown in FIG. 8, in the FFS structure, the first electrode 11 and the second electrode 12 are formed on the same substrate through an insulating film, and an electric field is applied between these electrodes to make the liquid crystal respond, The gradation display is performed. Actually, since the electrodes are formed on the same substrate, the electric field component parallel to the substrate is large, and as a result, characteristics with a wide viewing angle can be obtained.

特開平５−１０８０２３号公報（第１頁、図１）JP-A-5-108023 (first page, FIG. 1)

しかしながら、従来技術には次のような課題がある。従来技術によれば、視野角特性は向上できるものの、状況に応じて視野角を広げたり狭めたりして表示情報の秘匿性をコントロールすることまではできなかった。   However, the prior art has the following problems. According to the prior art, although the viewing angle characteristics can be improved, it has not been possible to control the confidentiality of display information by widening or narrowing the viewing angle depending on the situation.

本発明は上述のような課題を解決するためになされたもので、広視野角を実現しているＦＦＳ構造を有する液晶表示装置において、ディスプレイに表示された情報を共有化したい時には視野角を広げ、私有化したいときには視野角を狭くできるような視野角制御機能を備えた液晶表示装置を得ることを目的とする。   The present invention has been made to solve the above-described problems. In a liquid crystal display device having an FFS structure realizing a wide viewing angle, the viewing angle is widened when it is desired to share information displayed on the display. It is an object of the present invention to obtain a liquid crystal display device having a viewing angle control function capable of narrowing the viewing angle when it is desired to make it private.

本発明に係る液晶表示装置は、第１の基板上に設けられた第１の電極および第２の電極の間に横電界を発生させるＦＦＳ構造を有する液晶表示装置において、第１の基板と対向する第２の基板上に、第１の電極および第２の電極と縦電界を発生させる第３の電極をさらに備えたものである。   A liquid crystal display device according to the present invention is a liquid crystal display device having an FFS structure that generates a lateral electric field between a first electrode and a second electrode provided on a first substrate, and is opposed to the first substrate. And a third electrode for generating a longitudinal electric field with the first electrode and the second electrode on the second substrate.

本発明によれば、第３の電極を新たに設けて縦電界を印加する構造を有することにより、広視野角を実現しているＦＦＳ構造を有する液晶表示装置において、ディスプレイに表示された情報を共有化したい時には視野角を広げ、私有化したいときには視野角を狭くできるような視野角制御機能を備えた液晶表示装置を得ることができる。   According to the present invention, in the liquid crystal display device having the FFS structure that realizes a wide viewing angle by newly providing the third electrode and applying the vertical electric field, the information displayed on the display is displayed. A liquid crystal display device having a viewing angle control function that can widen the viewing angle when it is desired to share and narrow the viewing angle when desired to be private can be obtained.

以下、本発明の液晶表示装置の好適な実施の形態につき図面を用いて説明する。   Hereinafter, preferred embodiments of a liquid crystal display device of the present invention will be described with reference to the drawings.

実施の形態１．
図１は、本発明の実施の形態１におけるＦＦＳ構造を有する液晶表示装置の広視野角モードの構成図である。図１において、基板１０上には、従来のＦＦＳ構造と同様に、第１の電極１１および第２の電極１２が絶縁膜１３を介して形成されている。そして、本発明においては、基板１０に対向する基板２０上に、第３の電極２１を有している点を特徴としている。ここで縦電界を減らすように第３の電極２１の電圧を調整することにより、広視野角モードになる。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a wide viewing angle mode of a liquid crystal display device having an FFS structure according to Embodiment 1 of the present invention. In FIG. 1, a first electrode 11 and a second electrode 12 are formed on a substrate 10 via an insulating film 13, as in a conventional FFS structure. In the present invention, the third electrode 21 is provided on the substrate 20 facing the substrate 10. Here, the wide viewing angle mode is set by adjusting the voltage of the third electrode 21 so as to reduce the vertical electric field.

この第３の電極２１の電圧を調整することで、広視野角モードと狭視野角モードの切り替えを行うことが可能となる。図２は、本発明の実施の形態１におけるＦＦＳ構造を有する液晶表示装置の狭視野角モードの構成図である。図２に示すように、第３の電極２１に電圧を印加して縦電界を発生させることにより、液晶分子を傾けることができ、視野角制御が行えることとなる。そして、狭視野角モードになる。   By adjusting the voltage of the third electrode 21, switching between the wide viewing angle mode and the narrow viewing angle mode can be performed. FIG. 2 is a configuration diagram of a narrow viewing angle mode of the liquid crystal display device having the FFS structure according to Embodiment 1 of the present invention. As shown in FIG. 2, by applying a voltage to the third electrode 21 to generate a vertical electric field, the liquid crystal molecules can be tilted and the viewing angle can be controlled. Then, the narrow viewing angle mode is set.

基板２０上の第３の電極２１の上には、縦電界の影響を少なくするために、誘電体膜２２が形成されている。このような誘電体膜２２がなかったとしても、広視野角モードと狭視野角モードの切り替えは可能である。ただし、その場合は、広視野角モードでのコントラストの低下が発生することとなる。これに対して、誘電体膜２２をさらに形成することにより、コントラストの低下を抑えつつ、広視野角モードと狭視野角モードの切り替えが可能となる。   A dielectric film 22 is formed on the third electrode 21 on the substrate 20 in order to reduce the influence of the vertical electric field. Even without such a dielectric film 22, switching between the wide viewing angle mode and the narrow viewing angle mode is possible. However, in that case, a decrease in contrast occurs in the wide viewing angle mode. On the other hand, by further forming the dielectric film 22, it is possible to switch between the wide viewing angle mode and the narrow viewing angle mode while suppressing a decrease in contrast.

次に、図３ないし図７を用いて、視野角のシミュレーション結果について説明する。この図３〜図７は、３６０度の視野角におけるコントラストの等高線分布を示したものである。シミュレーションに使用したパラメータは、液晶の屈折率をｎｏ＝１．４７３、ｎｅ＝１．５５０とし、セルギャップを４．５μｍ、プレチルト角を１°とした。また、光学補償フィルムは使用せず、ラビング角（液晶の配列方向）は、電極のスリットに対して１５°傾いているとした。   Next, viewing angle simulation results will be described with reference to FIGS. 3 to 7 show the contour line distribution of contrast at a viewing angle of 360 degrees. The parameters used in the simulation were a liquid crystal refractive index of no = 1.473, ne = 1.550, a cell gap of 4.5 μm, and a pretilt angle of 1 °. Further, no optical compensation film was used, and the rubbing angle (liquid crystal alignment direction) was inclined by 15 ° with respect to the slit of the electrode.

図３は、本発明の実施の形態１における通常のＦＦＳ構造のシミュレーション結果である。通常のＦＦＳは、横スリットの構造となっている場合が多いが、ここでは、シングルドメインのＩＰＳ構造のように、上から下に第１の電極１１のスリットが入っているパターンを使用する。さらに、第１の電極１１の幅を３μｍとし、第１の電極１１の間隔を１０μｍとし、第１の電極１１と第２の電極１２との間の電圧は、７．５Ｖとしている。シミュレーション結果として、正面コントラスト比は、６０６となり、図３のような特性が得られる。   FIG. 3 is a simulation result of a normal FFS structure in the first embodiment of the present invention. The normal FFS often has a horizontal slit structure. Here, a pattern in which the slits of the first electrode 11 are provided from the top to the bottom is used as in the single-domain IPS structure. Further, the width of the first electrode 11 is 3 μm, the interval between the first electrodes 11 is 10 μm, and the voltage between the first electrode 11 and the second electrode 12 is 7.5V. As a result of the simulation, the front contrast ratio is 606, and the characteristics shown in FIG. 3 are obtained.

これに対して、図４は、本発明の実施の形態１における第３の電極２１を用いた場合の第１のシミュレーション結果である。より具体的には、第１の電極１１、第２の電極１２が形成されている基板１０の対向側の基板２０に第３の電極２１のみを形成し、さらに、第３の電極２１の電圧を第１の電極１１の電圧と同電位とした場合のシミュレーション結果である。その他の条件は、図３の条件と同じである。   On the other hand, FIG. 4 shows a first simulation result when the third electrode 21 in the first embodiment of the present invention is used. More specifically, only the third electrode 21 is formed on the substrate 20 opposite to the substrate 10 on which the first electrode 11 and the second electrode 12 are formed, and the voltage of the third electrode 21 is further increased. Is a simulation result in the case where is set to the same potential as the voltage of the first electrode 11. Other conditions are the same as those in FIG.

図４に示すように、傾向は、ほぼ図３と同じであるが、新たに形成した第３の電極２１の影響で、正面のコントラストがかなり小さくなっている（正面コントラスト比：２７０）。   As shown in FIG. 4, the tendency is almost the same as in FIG. 3, but the front contrast is considerably small due to the influence of the newly formed third electrode 21 (front contrast ratio: 270).

次に、図５は、本発明の実施の形態１における第３の電極２１を用いた場合の第２のシミュレーション結果である。より具体的には、図４と同じ構成のセルを使用し、第３の電極２１の電位を第１の電極１１の電位より、１．５Ｖ高くした場合のシミュレーション結果である。   Next, FIG. 5 shows a second simulation result when the third electrode 21 in the first embodiment of the present invention is used. More specifically, the simulation result is obtained when a cell having the same configuration as in FIG. 4 is used and the potential of the third electrode 21 is 1.5 V higher than the potential of the first electrode 11.

図５に示すように、正面コントラスト比は、さらに小さく１７２となるが、上下の視野角特性は、それほど変化させないまま、左右の視野角特性を悪くできる。   As shown in FIG. 5, the front contrast ratio is further reduced to 172, but the left and right viewing angle characteristics can be deteriorated without changing the upper and lower viewing angle characteristics so much.

次に、図６は、本発明の実施の形態１における第３の電極２１を用いた場合の第３のシミュレーション結果である。より具体的には、第１の電極１１、第２の電極１２が形成されている基板１０の対向側の基板２０に形成された第３の電極２１の上に、比誘電率３の誘電体膜２２を３．５μｍ形成し、第３の電極２１の電圧を第１の電極１１の電圧と同電位とした場合のシミュレーション結果である。   Next, FIG. 6 shows a third simulation result when the third electrode 21 in the first embodiment of the present invention is used. More specifically, a dielectric having a relative dielectric constant of 3 is formed on the third electrode 21 formed on the substrate 20 on the opposite side of the substrate 10 on which the first electrode 11 and the second electrode 12 are formed. This is a simulation result when the film 22 is formed with a thickness of 3.5 μm and the voltage of the third electrode 21 is set to the same potential as the voltage of the first electrode 11.

図６に示すように、視野角特性は、通常のＦＦＳモードと同じような特性を示し（図３参照）、かつ誘電体膜２２がなかった場合に比べ、正面のコントラスト比が高く、通常のＦＦＳモードの値と近くなっていることがわかる（正面コントラスト比：５９２）。   As shown in FIG. 6, the viewing angle characteristics are the same as those in the normal FFS mode (see FIG. 3), and the front contrast ratio is higher than in the case where the dielectric film 22 is not provided. It can be seen that the value is close to the value of the FFS mode (front contrast ratio: 592).

次に、図７は、本発明の実施の形態１における第３の電極２１を用いた場合の第４のシミュレーション結果である。より具体的には、図６と同じ構成のセルを使用し、第３の電極２１の電位を第１の電極１１の電位より３．３Ｖ高くした場合のシミュレーション結果である。   Next, FIG. 7 shows a fourth simulation result when the third electrode 21 in the first embodiment of the present invention is used. More specifically, the simulation result is obtained when a cell having the same configuration as that in FIG. 6 is used and the potential of the third electrode 21 is 3.3 V higher than the potential of the first electrode 11.

図７に示すように、先の図５の場合と同様に、上下の視野角特性をそれほど変化させないまま、左右の視野角特性を悪くできる。また、誘電体膜２２を形成しなかった場合に比べ、正面のコントラスト比は、高くなっている（正面コントラスト２２８）。   As shown in FIG. 7, as in the case of FIG. 5, the left and right viewing angle characteristics can be deteriorated without changing the upper and lower viewing angle characteristics so much. Also, the front contrast ratio is higher (front contrast 228) than when the dielectric film 22 is not formed.

以上のように、実施の形態１によれば、第１の電極および第２の電極が設けられた基板と対向する基板に第３の電極をさらに設け、第３の電極の電位をコントロールすることにより、所望の視野角特性を有する液晶表示装置を実現できる。さらに、第３の電極上に誘電体膜を形成することにより、従来のＩＰＳ構造と同等レベルの正面コントラスト比を得つつ、視野角制御が可能となる。   As described above, according to the first embodiment, the third electrode is further provided on the substrate facing the substrate on which the first electrode and the second electrode are provided, and the potential of the third electrode is controlled. Thus, a liquid crystal display device having a desired viewing angle characteristic can be realized. Furthermore, by forming a dielectric film on the third electrode, it is possible to control the viewing angle while obtaining a front contrast ratio equivalent to that of the conventional IPS structure.

本発明の実施の形態１におけるＦＦＳ構造を有する液晶表示装置の広視野角モードの構成図である。It is a block diagram of the wide viewing angle mode of the liquid crystal display device which has FFS structure in Embodiment 1 of this invention. 本発明の実施の形態１におけるＦＦＳ構造を有する液晶表示装置の狭視野角モードの構成図である。It is a block diagram of the narrow viewing angle mode of the liquid crystal display device which has FFS structure in Embodiment 1 of this invention. 本発明の実施の形態１における通常のＦＦＳ構造のシミュレーション結果である。It is a simulation result of the normal FFS structure in Embodiment 1 of this invention. 本発明の実施の形態１における第３の電極を用いた場合の第１のシミュレーション結果である。It is a 1st simulation result at the time of using the 3rd electrode in Embodiment 1 of this invention. 本発明の実施の形態１における第３の電極を用いた場合の第２のシミュレーション結果である。It is a 2nd simulation result at the time of using the 3rd electrode in Embodiment 1 of this invention. 本発明の実施の形態１における第３の電極を用いた場合の第３のシミュレーション結果である。It is a 3rd simulation result at the time of using the 3rd electrode in Embodiment 1 of this invention. 本発明の実施の形態１における第３の電極を用いた場合の第４のシミュレーション結果である。It is a 4th simulation result at the time of using the 3rd electrode in Embodiment 1 of this invention. 従来技術のＦＦＳ構造を示す図である。It is a figure which shows the FFS structure of a prior art.

符号の説明Explanation of symbols

１０ 基板、１１ 第１の電極、１２ 第２の電極、１３ 絶縁膜、２０ 基板、２１ 第３の電極、２２ 誘電体膜。   10 substrate, 11 first electrode, 12 second electrode, 13 insulating film, 20 substrate, 21 third electrode, 22 dielectric film.

Claims (6)

第１の基板上に設けられた第１の電極および第２の電極の間に横電界を発生させるＦＦＳ構造を有する液晶表示装置において、
前記第１の基板と対向する第２の基板上に、前記第１の電極および前記第２の電極と縦電界を発生させる第３の電極をさらに備えたことを特徴とする液晶表示装置。 In a liquid crystal display device having an FFS structure for generating a lateral electric field between a first electrode and a second electrode provided on a first substrate,
The liquid crystal display device further comprising a third electrode for generating a vertical electric field with the first electrode and the second electrode on a second substrate facing the first substrate. 請求項１に記載の液晶表示装置において、
前記第２の基板は、前記第３の電極上に形成された誘電体膜をさらに備えたことを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1.
The liquid crystal display device, wherein the second substrate further includes a dielectric film formed on the third electrode. 請求項１に記載の液晶表示装置において、
前記第１の電極と前記第２の電極は、絶縁膜を介して設けられたことを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1.
The liquid crystal display device, wherein the first electrode and the second electrode are provided via an insulating film. 請求項１に記載の液晶表示装置において、
前記第３の電極の電圧を調整することによって広視野角モードと狭視野角モードの切り替えすることを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1.
A liquid crystal display device, wherein a wide viewing angle mode and a narrow viewing angle mode are switched by adjusting a voltage of the third electrode. 求項４に記載の液晶表示装置において、
前記第３の電極の電圧は、前記第１の電極の電圧と同電位とすることを特徴とする液晶表示装置。 In the liquid crystal display device according to claim 4,
The liquid crystal display device, wherein the voltage of the third electrode is the same potential as the voltage of the first electrode. 請求項４に記載の液晶表示装置において、
前記第３の電極の電圧は、前記第１の電極の電圧より高いことを特徴とする液晶表示装置。 The liquid crystal display device according to claim 4.
The liquid crystal display device, wherein a voltage of the third electrode is higher than a voltage of the first electrode.
JP2005379830A 2005-12-28 2005-12-28 Liquid crystal display device Pending JP2007178907A (en)

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