JP2009134228A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease a driving voltage in a liquid crystal display that controls alignment of liquid crystal molecules by using an approximately horizontal electric field with respect to a transparent substrate. <P>SOLUTION: Liquid crystal molecules M having a negative dielectric anisotropy Δε are held in between a first transparent substrate 10 and a second transparent substrate 20. A first common electrode 14 and an insulating film 15 covering the electrode are disposed on the first transparent substrate 10; and a pixel electrode 16 comprising a plurality of linear portions 16E and slits 16S is disposed on the insulating film 15. The width D1 of the slit 16S is larger than the width D2 of the linear portion 16E. Thereby, a horizontal electric field component between the first common electrode 14 and the pixel electrode 16 is enhanced, which decreases the driving voltage. A common potential or a center potential of the common potential is applied to a second common electrode 24 disposed on the second transparent substrate 20. Thereby, when a display signal is applied to the pixel electrode 16, a vertical electric field component is induced in the liquid crystal layer LC, which keeps the alignment of the liquid crystal molecules M horizontal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that controls the alignment of liquid crystal molecules using an electric field in a substantially horizontal direction with respect to a transparent substrate.

As a liquid crystal display device capable of obtaining a high contrast and a wide viewing angle, a liquid crystal display device that controls the orientation of liquid crystal molecules using an electric field in a substantially horizontal direction with respect to two transparent substrates sandwiching liquid crystal, for example, FFS (Fringe Liquid crystal display devices that operate in a field switching (IPS) mode, an in-plane switching (IPS) mode, and the like are known. In this liquid crystal display device, a pixel electrode to which a display signal is applied and a first common electrode to which a common potential is applied are arranged on one transparent substrate.

An example of the FFS mode liquid crystal display device will be described. As shown in the cross-sectional view of FIG. 8, the first polarizing plate 11 is disposed on the first transparent substrate 10 on the side facing the light source BL. A first common electrode 14 is disposed on the first transparent substrate 10 on the side not facing the light source BL. The first common electrode 14 is covered with an insulating film 15. On the insulating film 15, as the pixel electrode 56, a plurality of linear portions 56E and slits 56S are alternately arranged in parallel.
The pixel electrode 56 is covered with the alignment film 17.

On the other hand, on the side of the second transparent substrate 20 that does not face the first transparent substrate 10,
The polarizing plate 21 is disposed, and on the side facing the first transparent substrate 10, a color filter (not shown) and an alignment film 27 covering the color filter are disposed.

The liquid crystal molecules of the liquid crystal layer LC sandwiched between the first transparent substrate 10 and the second transparent substrate 20 are initially aligned according to the rubbing direction of the alignment films 17 and 27. When a display signal is applied to the linear portion 56E of the pixel electrode 56, the first transparent substrate 10 out of the electric field extending from the linear portion 56E to the first common electrode 14 extending below the slit 56S. The orientation direction of the liquid crystal molecules in the liquid crystal layer LC is controlled in accordance with an electric field in a substantially horizontal direction (hereinafter referred to as a horizontal electric field component). Optical control is performed through the liquid crystal layer LC, and white display or black display is performed.

Patent Documents 1 and 2 describe liquid crystal display devices that control the alignment of liquid crystal molecules using an electric field in a substantially horizontal direction with respect to a transparent substrate.
JP 2007-47786 A JP 2002-31812 A

However, as shown in FIG. 8, when a display signal is applied to the pixel electrode 56 in the liquid crystal display device described above, an electric field component extending in a substantially horizontal direction with respect to the first transparent substrate 10, that is, a horizontal electric field component. In addition, an electric field component (hereinafter, referred to as “electric field component”) extending in a direction substantially perpendicular to the first transparent substrate 10.
A vertical electric field component).

In order to obtain a desired display, the alignment direction of the liquid crystal molecules of the liquid crystal layer LC needs to rotate along the horizontal electric field component. Therefore, the potential of the display signal applied to the pixel electrode 56 is set high in order to strengthen the horizontal electric field component contributing to the desired display. Therefore, the problem that the drive voltage of a liquid crystal display device becomes high has arisen.

The liquid crystal display device of the present invention has been made in view of the above problems, and includes a plurality of pixels.
Each pixel includes a liquid crystal layer sandwiched between a first substrate and a second substrate and having negative dielectric anisotropy,
A first common electrode disposed on the substrate and applied with a common potential, and a plurality of linear portions and slits alternately disposed on the first common electrode via an insulating film, and a display signal is applied. And a second common electrode disposed on the second substrate so as to face the first common electrode and the pixel electrode and to which a voltage based on a common potential is applied. The width is larger than the width of the linear portion.

The liquid crystal display device of the present invention includes a plurality of pixels, each pixel being sandwiched between a first substrate and a second substrate, a liquid crystal layer having negative dielectric anisotropy, and the first substrate A pixel electrode disposed on the pixel electrode to which a display signal is applied; a first common electrode disposed on the pixel electrode via an insulating film and having a plurality of linear portions and slits alternately applied with a common potential; A second common electrode disposed on the second substrate so as to face the first common electrode and the pixel electrode and to which a voltage based on a common potential is applied, and the linear portion of the first common electrode The width is larger than the width of the slit.

The liquid crystal display device of the present invention includes a plurality of pixels, each pixel being sandwiched between a first substrate and a second substrate, a liquid crystal layer having negative dielectric anisotropy, and the first substrate A first common electrode arranged on the first substrate to which a common potential is applied; a pixel electrode arranged alternately on the first substrate with respect to the first common electrode; And a second common electrode disposed opposite to the first common electrode and the pixel electrode to which a voltage based on a common potential is applied, and the width of the first common electrode is larger than the width of the pixel electrode It is characterized by that.

The liquid crystal display device of the present invention includes a plurality of pixels, each pixel being sandwiched between a first substrate and a second substrate, a liquid crystal layer having negative dielectric anisotropy, and the first substrate A first common electrode arranged on the first substrate to which a common potential is applied; a pixel electrode arranged alternately on the first substrate with respect to the first common electrode; And a second common electrode which is arranged opposite to the first common electrode and the pixel electrode and to which a voltage based on a common potential is applied, and the width of the first common electrode is smaller than the width of the pixel electrode It is characterized by that.

According to this configuration, in the electric field generated between the pixel electrode disposed on the first substrate and the first common electrode, the electric field component extending in a substantially horizontal direction with respect to the first substrate or the second substrate ( Since the horizontal electric field component becomes strong, the driving voltage of the liquid crystal display device can be lowered.

ADVANTAGE OF THE INVENTION According to this invention, in a liquid crystal display device which controls the orientation of a liquid crystal molecule using the electric field of a substantially horizontal direction with respect to a transparent substrate, a drive voltage can be made low.

A liquid crystal display device according to a first embodiment of the present invention will be described. This liquid crystal display device
A description will be given assuming that the operation is performed in the FFS mode. First, a schematic equivalent circuit of the liquid crystal display device will be described with reference to the drawings. FIG. 1 is an equivalent circuit diagram of the liquid crystal display device according to the present embodiment. FIG. 1 shows only some of the plurality of pixels included in the liquid crystal display device.

As shown in FIG. 1, it corresponds to each intersection of a plurality of pixel selection signal lines GL supplied with a pixel selection signal from the vertical drive circuit 101 and a display signal line DL supplied with a display signal from the horizontal drive circuit 102. Thus, the pixel 1P is arranged. Each pixel 1P has a gate serving as a pixel selection signal GL.
And a pixel transistor TR such as a thin film transistor having a drain connected to the display signal line DL. A pixel electrode (not shown) is connected to the source of the pixel transistor TR, and an electric field is formed in the liquid crystal layer LC by the pixel electrode and the first common electrode (not shown).

Hereinafter, a detailed configuration of the liquid crystal display device will be described with reference to the drawings. FIG. 2 is a plan view showing the liquid crystal display device according to the present embodiment. In FIG. 2, for convenience of explanation, only one pixel 1P is shown from among the plurality of pixels 1P, and only main components on the first transparent substrate 10 side are shown. FIG. 3 is a cross-sectional view of the liquid crystal display device according to the present embodiment, showing a cross section taken along line XX of FIG. FIG. 3A shows an off state in which no voltage is applied to the pixel electrode 16 described later, and FIG. 3B shows an on state in which a voltage is applied to the pixel electrode 16. 2 and 3, the same components as those shown in FIG. 8 of the conventional example are denoted by the same reference numerals.

As shown in FIGS. 2 and 3A, the liquid crystal layer LC is sandwiched between the first transparent substrate 10 and the second transparent substrate 20 disposed to face the first transparent substrate 10. A first polarizing plate 11 is arranged on the first transparent substrate 10 on the side facing the light source BL. A first common electrode 14 to which a common potential is applied from the drive circuit 103 is disposed on the first transparent substrate 10 on the side not facing the light source BL. The first common electrode 14 is made of a transparent conductive material such as ITO (Indium Tin Oxide). The common potential applied to the first common electrode 14 may be a fixed potential according to the driving method of the liquid crystal display device, or may be one in which the positive polarity and the negative polarity are alternately inverted.

The first common electrode 14 is covered with an insulating film 15. On the insulating film 15, a plurality of linear portions 16 </ b> E and slits 16 </ b> S are alternately arranged in parallel as pixel electrodes 16. The pixel electrode 16 is made of a transparent conductive material such as ITO. The slit 16S may have a shape in which one end of the long axis is opened.

The width D1 of the slit 16S of the pixel electrode 16 is larger than the width D2 of the linear portion 16E, and preferably about twice or more the width D2 of the linear portion 16E. With this configuration, the plurality of linear portions 16E
A large interval is ensured. In addition, although the end of each linear part 16E is mutually connected, the width | variety of the connection part is not limited above.

The insulating film 15 and the pixel electrode 16 are covered with an alignment film 17. The rubbing direction of the alignment film 17 is parallel to or orthogonal to the transmission axis of the first polarizing plate 11, and the pixel electrode 16.
With respect to the longitudinal direction of the linear portion 16E, the inclination angle θ1 is about 45 degrees to about 90 degrees, preferably about 87 degrees (see FIG. 2). In the following description, the case where the rubbing direction of the alignment film 17 is parallel to the transmission axis of the first polarizing plate 11 will be described as an example.

On the other hand, on the second transparent substrate 20, a second polarizing plate 21 having a transmission axis orthogonal to the transmission axis of the first polarizing plate 11 is disposed on the side not facing the first transparent substrate 10. ing. A color filter (not shown) is provided on the second transparent substrate 20 on the side facing the first transparent substrate 10.
Further, a second common electrode 24 made of a transparent conductive material such as ITO is disposed. The second common electrode 24 is covered with an alignment film 27 having a rubbing direction parallel to the rubbing direction of the alignment film 17 on the first transparent substrate 10 side.

Regardless of whether or not a display signal is applied to the pixel electrode 16, a voltage having the same potential as that applied to the first common electrode 14 is applied to the second common electrode 24 from the drive circuit 103. Is done. Alternatively, when a common potential that is alternately inverted between positive polarity and negative polarity is applied to the first common electrode 14, the center potential of the common potential is applied to the second common electrode 24.

The liquid crystal molecules M of the liquid crystal layer LC sandwiched between the first transparent substrate 10 and the second transparent substrate 20 described above are rubbed in the rubbing direction of the alignment films 17 and 27 parallel to the transmission axis of the first polarizing plate 11. Depending on the initial orientation. The liquid crystal molecules M of the liquid crystal layer LC have a negative dielectric anisotropy Δε,
The major axis direction rotates so as to be orthogonal to the direction of the electric field. The negative dielectric anisotropy Δε is about −3.0 to about −10.0, preferably about −5.0.

The operation of this liquid crystal display device will be described below. As shown in FIG. 3A, in the off state where no voltage is applied to the pixel electrode 16, the liquid crystal molecules M of the liquid crystal layer LC are homogeneously aligned substantially horizontally with respect to the first transparent substrate 10. Further, in the plane horizontal to the first transparent substrate 10, the major axis direction of the liquid crystal molecules M is parallel to the transmission axis of the first polarizing plate 11.

Further, a common potential or a center potential of the common potential is applied to the second common electrode 24 regardless of whether or not a display signal is applied to the pixel electrode 16. Therefore, in this off state, an electric field is not generated or hardly generated in the liquid crystal layer LC. As a result, even when static electricity is discharged to the second transparent substrate 20 side during use of the liquid crystal display device or the like, adverse effects of the static electricity, for example, electrostatic charges move from the second common electrode 24 to the pixel electrode 16. It is possible to suppress burn-in that occurs.

In this OFF state, the light of the light source BL linearly polarized by the first polarizing plate 11 passes through the liquid crystal layer LC with the polarization axis as it is and enters the second polarizing plate 21. However, this light is absorbed by the second polarizing plate 21 because its polarization axis is orthogonal to the transmission axis of the second polarizing plate 21. That is, black display (normally black) is obtained.

On the other hand, as shown in FIG. 3B, in the ON state in which a voltage is applied to the pixel electrode 16, the first
An electric field is generated between the common electrode 14 and the linear portion 16E of the pixel electrode 16. Further, since the common potential or the center potential of the common potential is applied to the second common electrode 24, the pixel electrode 1
An electric field is also generated between the sixth linear portion 16E and the second common electrode 24. Therefore, the liquid crystal layer LC
As a result, a substantially horizontal electric field, that is, a horizontal electric field component is generated with respect to the first transparent substrate 10, and a substantially vertical electric field, that is, a vertical electric field component is generated.

Since the dielectric anisotropy Δε of the liquid crystal molecules M is negative, the major axis direction of the liquid crystal molecules M is reliably aligned horizontally with respect to the first transparent substrate 10 according to the vertical electric field component. At the same time, it rotates in a plane parallel to the first transparent substrate 10 in accordance with the horizontal electric field component.

In this ON state, the light of the light source BL linearly polarized by the first polarizing plate 11 becomes elliptically polarized light due to birefringence in the liquid crystal layer LC and enters the second polarizing plate 21. Among the elliptically polarized light, a component that coincides with the transmission axis of the second polarizing plate 21 is emitted and white display is performed.

At that time, the liquid crystal molecules M are inclined in a substantially vertical direction with respect to the first transparent substrate 10 by an electric field generated between the linear portion 16E of the pixel electrode 16 and the second common electrode 24, that is, a vertical electric field component. Therefore, the white display can be realized in a wide viewing angle.

In addition to this, in the pixel electrode 16 of the present embodiment, a large interval between the plurality of linear portions 16E is secured, so that the gap between the first common electrode 14 and the linear portion 16E of the pixel electrode 16 is between. In the generated electric field, an electric field extending in a substantially horizontal direction of the first transparent substrate 10, that is, a horizontal electric field component becomes strong. This eliminates the need to set the potential of the display signal applied to the pixel electrode 16 to be high in order to increase the horizontal electric field component contributing to the desired display as in the conventional example. Therefore, the driving voltage of the liquid crystal display device can be made as low as possible.

In the above embodiment, the first common electrode 14 and the pixel electrode 16 may be interchanged. That is, a pixel electrode having the same shape as the first common electrode 14 and to which a display signal is applied is covered with the insulating film 15, and has a plurality of linear portions and slits alternately and a common potential is applied. The first common electrode may be disposed on the insulating film 15 overlapping the pixel electrode. In this case, in order to strengthen the electric field extending in the substantially horizontal direction of the first transparent substrate 10, that is, the horizontal electric field component, the width of the linear portion of the first common electrode is larger than the width of the slit, preferably About 2 slit width
It is more than double. Thereby, the effect similar to the above can be acquired.

The liquid crystal display device of the present invention is not limited to the above embodiment, and may have a configuration that operates in modes other than the FFS mode. Hereinafter, as a second embodiment of the present invention, a liquid crystal display device that operates in a mode other than the FFS mode will be described with reference to the drawings. However, a schematic equivalent circuit diagram of the liquid crystal display device is the same as that shown in FIG. 1 of the first embodiment, and thus description thereof is omitted.

Hereinafter, a detailed configuration of the liquid crystal display device will be described with reference to the drawings. FIG. 4 is a plan view showing the liquid crystal display device according to the present embodiment. In FIG. 4, for convenience of explanation, only one pixel 1P is shown from among the plurality of pixels 1P, and only main components on the first transparent substrate 10 side are shown. FIG. 5 is a cross-sectional view of the liquid crystal display device according to the present embodiment, showing a cross section taken along line YY of FIG. FIG. 5A shows an off state in which no voltage is applied to a pixel electrode 36 described later, and FIG. 5B shows an on state in which a voltage is applied to the pixel electrode 36.

In this liquid crystal display device, only the configuration on the first transparent substrate 10 side is different, and the other configuration is the same as that of the first embodiment. Therefore, in FIGS. 4 and 5, the same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIGS. 4 and 5A, a plurality of linear first common electrodes 34 made of a transparent conductive material such as ITO are arranged on the first transparent substrate 10 at a predetermined interval. Yes. A common potential is applied to the first common electrode 34 as in the first embodiment. The first transparent substrate 1
On the 0, a plurality of linear pixel electrodes 36 made of a transparent conductive material such as ITO are arranged between the first common electrodes 34 with a predetermined interval. That is, on the first transparent substrate 10, the first common electrodes 34 and the pixel electrodes 36 are alternately arranged with a predetermined interval. A display signal is applied to the pixel electrode 36 as in the first embodiment.

The width D3 of the first common electrode 34 is larger than the width D4 of the linear portion of the pixel electrode 36, and is preferably about twice or more the width D4 of the pixel electrode 36. Note that both or one of the first common electrode 34 and the pixel electrode 36 may be made of a non-transparent conductive material instead of the transparent conductive material. The ends of the first common electrodes 34 are connected to each other. Similarly, the ends of the pixel electrodes 36 are connected to each other. The widths of these connecting portions are not limited to the above.

The first common electrode 34 and the pixel electrode 36 are covered with the alignment film 17. The rubbing direction of the alignment film 17 is parallel to or orthogonal to the transmission axis of the first polarizing plate 11 and is the first relative to the longitudinal direction of the linear pixel electrode 36 extending from the connection portion. The tilt angle θ2 is the same as the tilt angle θ1 of the embodiment (see FIG. 4). In the following description, the case where the rubbing direction of the alignment film 17 is parallel to the transmission axis of the first polarizing plate 11 will be described as an example.

The operation of this liquid crystal display device will be described below. As shown in FIG. 5A, in the off state in which no voltage is applied to the pixel electrode 36, the liquid crystal molecules M of the liquid crystal layer LC are homogeneously aligned substantially horizontally with respect to the first transparent substrate 10. Further, in the plane horizontal to the first transparent substrate 10, the major axis direction of the liquid crystal molecules M is parallel to the transmission axis of the first polarizing plate 11.

Further, a common potential or a center potential of the common potential is applied to the second common electrode 24 regardless of whether or not a display signal is applied to the pixel electrode 36. Therefore, in this off state, an electric field is not generated or hardly generated in the liquid crystal layer LC. As a result, even when static electricity is discharged to the second transparent substrate 20 side during use of the liquid crystal display device or the like, adverse effects of the static electricity, for example, electrostatic charges move from the second common electrode 24 to the pixel electrode 36. It is possible to suppress burn-in that occurs. In this off state, black display is performed as in the off state in the first embodiment.

On the other hand, as shown in FIG. 5B, in the ON state in which a voltage is applied to the pixel electrode 36, the first
An electric field is generated between the common electrode 34 and the linear portion of the pixel electrode 36. The second common electrode 2
4 is applied with a common potential or a center potential of the common potential, so that an electric field is also generated between the linear portion of the pixel electrode 36 and the second common electrode 24. Therefore, in the liquid crystal layer LC, a substantially horizontal electric field, that is, a horizontal electric field component is generated with respect to the first transparent substrate 10, and a substantially vertical electric field, that is, a vertical electric field component is generated.

Since the dielectric anisotropy Δε of the liquid crystal molecules M is negative, the major axis direction of the liquid crystal molecules M is reliably aligned horizontally with respect to the first transparent substrate 10 according to the vertical electric field component. At the same time, it rotates in a plane parallel to the first transparent substrate 10 in accordance with the horizontal electric field component. In the on state, white display is performed in a wide viewing angle, as in the on state in the first embodiment.

In addition, in the present embodiment, the width D3 of the first common electrode 34 is equal to the width D4 of the pixel electrode 36.
Therefore, in the electric field generated between the first common electrode 34 and the linear portion of the pixel electrode 36, the electric field extending in the substantially horizontal direction of the first transparent substrate 10, that is, the horizontal electric field component is strong. Become. As a result, unlike the conventional example, it is not necessary to set the potential of the display signal applied to the pixel electrode 36 high in order to strengthen the horizontal electric field component contributing to the desired display. Therefore, the driving voltage of the liquid crystal display device can be made as low as possible.

In the present embodiment, the linear portion of the pixel electrode 36 sandwiching the liquid crystal layer LC and the second common electrode 24.
By using an electric field generated between the auxiliary electrodes, an auxiliary capacitor for holding a display signal applied to the pixel electrode 36 for a certain period can be provided. That is, the linear portion of the pixel electrode 36 is used as one capacitor electrode, the liquid crystal layer LC is used as a capacitor insulating film, and the second common electrode 24 is used as the other capacitor electrode, so that these can be used as auxiliary capacitors. . Accordingly, the first transparent substrate 10 is
The auxiliary capacitor can be provided without separately forming a capacitor electrode or a capacitor insulating film as the auxiliary capacitor. Therefore, the manufacturing process for forming the auxiliary capacitor is simplified, and the manufacturing cost can be reduced.

Hereinafter, an equivalent circuit of the liquid crystal display device in this case will be described with reference to the drawings.
FIG. 6 is an equivalent circuit diagram of the liquid crystal display device according to the present embodiment, and shows a case where the second common electrode 24 is used as a capacitor electrode. FIG. 7 is a plan view showing the liquid crystal display device of FIG.
6 and 7, the same components as those shown in FIGS. 1, 4, and 5 are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 6, it is preferable that the same potential COM2 as the common potential COM1 applied to the first common electrode 34 is applied to the second common electrode 24. As a result, the common potential CO
There is no potential difference between M1 and potential COM2, no unnecessary capacitance Cp is generated between the first common electrode 34 and the second common electrode 24, and no unnecessary orientation change occurs in the liquid crystal layer LC.

Further, as shown in FIG. 7, the width D3 of the first common electrode 34 may be smaller than the width D4 of the linear portion of the pixel electrode 36. As a result, the area of the linear portion of the pixel electrode 36 is expanded, and the electric field generated between the area and the second common electrode 24 can be increased, so that the capacitance value of the auxiliary capacitor Cs can be increased.

In this case, of the electric field generated between the first common electrode 34 and the linear portion of the pixel electrode 36, the horizontal electric field component corresponding to the display signal may be weakened. Since the rate anisotropy Δε is negative, in the major axis direction of the liquid crystal molecules M, the first electric field generated between the linear portion of the pixel electrode 36 and the second common electrode 24 is increased. While being surely oriented horizontally with respect to the transparent substrate 10, it rotates in a horizontal plane with respect to the first transparent substrate 10 in accordance with the horizontal electric field component.

That is, even when the width D3 of the first common electrode 34 is smaller than the width D4 of the linear portion of the pixel electrode 36, the pixel electrode is used to increase the horizontal electric field component contributing to a desired display as in the conventional example. It is not necessary to set the potential of the display signal applied to 36 high. Therefore, the driving voltage of the liquid crystal display device can be made as low as possible.

1 is an equivalent circuit diagram of a liquid crystal display device according to a first embodiment of the present invention. 1 is a plan view showing a liquid crystal display device according to a first embodiment of the present invention. It is sectional drawing which shows the liquid crystal display device by the 1st Embodiment of this invention. It is a top view which shows the liquid crystal display device by the 2nd Embodiment of this invention. It is sectional drawing which shows the liquid crystal display device by the 2nd Embodiment of this invention. It is an equivalent circuit diagram of the liquid crystal display device by the 2nd Embodiment of this invention. It is a top view which shows the liquid crystal display device by the 2nd Embodiment of this invention. It is sectional drawing which shows the liquid crystal display device by a prior art example.

Explanation of symbols

1P pixel 10 first transparent substrate 11 first polarizing plate 14, 34 first common electrode 15 insulating film 16, 36, 56 pixel electrode 16E, 56E linear portion 16S, 56S slit 17, 27 alignment film 20 second Transparent substrate 21 second polarizing plate 24 second common electrode 101 vertical driving circuit 102 horizontal driving circuit 103 driving circuit BL light source LC liquid crystal layer M liquid crystal molecule TR pixel transistor GL pixel selection signal line DL display signal line

Claims (10)

A plurality of pixels, each pixel being
A liquid crystal layer sandwiched between the first substrate and the second substrate and having negative dielectric anisotropy;
A first common electrode disposed on the first substrate and applied with a common potential;
A pixel electrode disposed on the first common electrode via an insulating film and alternately having a plurality of linear portions and slits to which a display signal is applied;
A second common electrode disposed on the second substrate so as to face the first common electrode and the pixel electrode and to which a voltage based on the common potential is applied;
The width of the slit of the pixel electrode is larger than the width of the linear portion. A plurality of pixels, each pixel being
A liquid crystal layer sandwiched between the first substrate and the second substrate and having negative dielectric anisotropy;
A pixel electrode disposed on the first substrate to which a display signal is applied;
A first common electrode disposed on the pixel electrode with an insulating film interposed between the plurality of linear portions and slits, to which a common potential is applied;
A second common electrode disposed on the second substrate so as to face the first common electrode and the pixel electrode and to which a voltage based on the common potential is applied;
The liquid crystal display device, wherein the width of the linear portion of the first common electrode is larger than the width of the slit. A plurality of pixels, each pixel being
A liquid crystal layer sandwiched between the first substrate and the second substrate and having negative dielectric anisotropy;
A first common electrode disposed on the first substrate and applied with a common potential;
Pixel electrodes alternately arranged on the first substrate with respect to the first common electrode and to which a display signal is applied;
A second common electrode disposed on the second substrate so as to face the first common electrode and the pixel electrode and to which a voltage based on the common potential is applied;
The liquid crystal display device, wherein a width of the first common electrode is larger than a width of the pixel electrode. A plurality of pixels, each pixel being
A liquid crystal layer sandwiched between the first substrate and the second substrate and having negative dielectric anisotropy;
A first common electrode disposed on the first substrate and applied with a common potential;
Pixel electrodes alternately arranged on the first substrate with respect to the first common electrode and to which a display signal is applied;
A second common electrode disposed on the second substrate so as to face the first common electrode and the pixel electrode and to which a voltage based on the common potential is applied;
The liquid crystal display device, wherein a width of the first common electrode is smaller than a width of the pixel electrode. The width of the slit of the pixel electrode is at least twice the width of the linear portion.
A liquid crystal display device according to 1. 3. The liquid crystal display device according to claim 2, wherein the width of the linear portion of the first common electrode is at least twice the width of the slit. The liquid crystal display device according to claim 3, wherein the width of the first common electrode is twice or more the width of the pixel electrode. The liquid crystal display device according to claim 1, wherein the first common electrode and the pixel electrode are made of a transparent conductive material. 8. The liquid crystal display device according to claim 1, wherein a voltage having the same potential as the common potential is applied to the second common electrode. . 7. The common potential is inverted alternately between positive polarity and negative polarity, and a center potential of the common potential is applied to the second common electrode. 8. A liquid crystal display device according to any one of the above items.

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