JP3449537B2 - Liquid crystal display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal electric field type active matrix liquid crystal display device, and more particularly,
The present invention relates to a reduction in a display defect caused by a load on a display surface, which is called a load mark that is visually recognized for a long time even after weight removal.

[0002]

2. Description of the Related Art In recent years, as disclosed in, for example, Japanese Patent Laid-Open No. 8-254712, in an active matrix type liquid crystal display device, the direction of the electric field applied to the liquid crystal is set to a direction parallel to the substrate. The directional electric field method is mainly used as a method for obtaining an ultra wide viewing angle. When this method is adopted, it has been clarified that there is almost no change in contrast and gradation level inversion when the viewing angle direction is changed (reference: M. Oh-e, et al., Asia Displa.
y'95, pp.577-580). FIG. 10 is a plan view showing a pixel portion of a conventional general horizontal electric field type liquid crystal display device. In the figure, reference numeral 2 denotes a gate wiring which is a plurality of scanning signal lines formed on an insulating substrate and intersects with a source wiring 12 which is a plurality of video signal lines. 4 is a storage capacitor common line, 6 is a semiconductor film of a thin film transistor provided at each intersection of the gate line 2 and source line 12, 9 is a storage capacitor electrode provided on the storage capacitor common line 4 via a gate insulating film, Reference numeral 10 denotes a comb-shaped pixel electrode including a plurality of electrodes connected to the thin film transistor and provided in parallel with the source wiring 12. Reference numeral 11 denotes a plurality of electrodes arranged in parallel and alternately with the plurality of electrodes of the pixel electrode 10. Is a counter electrode, and 14 is a drain electrode, and 16 is a contact hole.

[0003]

In such a lateral electric field type liquid crystal display device, due to the weight applied to the display surface,
There is a problem that a display defect occurs due to an abnormal alignment of the liquid crystal around the weighted portion, and a phenomenon called a load mark occurs in which the display defect is visually recognized for a long time even after the weight is removed. The principle of generation of weighted marks will be described with reference to FIGS. 11 to 14. 11 is a state in which no voltage is applied to the liquid crystal, FIG. 12 is a state in which a voltage is applied to the liquid crystal, FIG. 13 is a state in which a voltage is applied to the liquid crystal and weighting is applied, and FIG. 14 is a state in which a voltage is applied to the liquid crystal. In addition, the alignment of the liquid crystal molecules in the state after the unloading is shown. In the state in which no voltage is applied to the liquid crystal, the liquid crystal is aligned in the alignment direction determined by the liquid crystal alignment method such as rubbing as shown in FIG.
When a voltage is applied to the liquid crystal, the liquid crystal is aligned in the direction of the electric field. At this time, as shown in FIG. 12, since the direction of the electric field changes at the end portion of the pixel electrode 10 and the end portion of the counter electrode 11, a region in which the liquid crystal rotates in the reverse direction occurs, and an alignment defect region 22 is formed at the boundary with the region in which the liquid crystal rotates in the normal direction. Occurs. In the state where a voltage is applied and the pressure is constant, this poorly-aligned region is generated only near the end of the electrode, and therefore is hardly visible. However, when there is a load on the display surface in the voltage applied state, as shown in FIG. 13, there occurs a phenomenon in which the misalignment region 22 at the end of the pixel electrode 10 and the misalignment region 22 at the end of the counter electrode 11 expand, and the misalignment region occurs. 22
Will be seen. Most of the misalignment region 22 returns to the initial state after the weight is removed, but some of the misalignment region 22 remains visible for a long time as shown in FIG. 14 and the display quality is significantly deteriorated.

11 to 14 show the case where the orientation direction of the liquid crystal is counterclockwise with respect to the source wiring 12, the case where the orientation direction of the liquid crystal is clockwise with respect to the source wiring 12 is shown in FIG. ~ Shown in FIG. FIG. 15 shows a state in which a voltage is applied to the liquid crystal, FIG. 16 shows a state in which a voltage is applied to the liquid crystal and weighting, and FIG. 17 shows an arrangement of liquid crystal molecules in a state in which a voltage is applied to the liquid crystal and after weighting. Shows. As described above, the location where the abnormal alignment region 22 is generated when the liquid crystal is oriented clockwise with respect to the source wiring 12 is line-symmetric with respect to the location where the liquid crystal is oriented counterclockwise with respect to the source wiring 12. A method of increasing the rubbing angle is generally known as a method of reducing the above-mentioned weighted marks. However, in the horizontal electric field method, the viewing angle direction with high contrast is the rubbing angle direction, that is, the alignment direction of the liquid crystal and the direction perpendicular to the rubbing angle direction. Therefore, when the rubbing angle is increased, the viewing angle characteristics of the display device in the vertical and horizontal directions deteriorate. There is a problem. Further, since the driving voltage increases as the rubbing angle increases, there is a problem that low voltage driving becomes difficult.

The present invention has been made in order to solve the above problems, and reduces a display defect caused by a load on a display surface, which is called a load mark that is visually recognized for a long time even after weight removal, An object of the present invention is to obtain a horizontal electric field type liquid crystal display device which has a wide viewing angle, good display characteristics, is easy to manufacture, and is low in cost.

[0006]

SUMMARY OF THE INVENTION The liquid crystal display device that by the present invention, the pair and the pair of substrates direction disposed, and a liquid crystal layer sandwiched between said substrates, each other physician is formed on one substrate above A plurality of scanning signal lines and a plurality of video signal lines intersecting with,
A thin film transistor kicked set <br/> to correspond to the intersection of the scanning signal lines and the video signal line, and the picture element electrode ing from multiple several electrodes connected to said thin film transistors, a plurality of the pixel electrodes I than double several electrodes extending along the electrode
A that pair counter electrode, the liquid crystal display device to be applied to the liquid crystal layer substantially parallel electric field to the substrate surface by applying a voltage between the pixel electrode and the counter electrode, electrodeposition plurality of the pixel electrodes
At least the thin film of at least one electrode of a pole
The pixel electrode tip on the side away from the transistor and the above pair
Of at least one of the plurality of electrodes
At least the counter electrode tip near the thin film transistor
The edge part of the other side is separated by a gap in the direction almost parallel to the substrate surface.
It faces the electrodes, and the counter electrode is
Bends are provided at the pole tips, and these bends are
Each is formed following its root, and again
The bending point between the bent part and the root part is the origin and the
Regarding the XY plane assuming the extension line as the Y axis,
If the curved line and the alignment line of the liquid crystal layer are located in different quadrants,
It is characterized by being present.

In the liquid crystal display device according to the present invention , at least the counter electrode corresponding to the tip of the pixel electrode is provided.
A bent portion provided at the tip of the pixel electrode on one electrode
Forming a substantially parallel bent portion, and forming a pair of electrodes on at least one of the pixel electrodes corresponding to the tip of the counter electrode .
Substantially parallel bent portion and the bent portion provided in response electrode tip
It is characterized by being formed .

Further, the liquid crystal display device according to the present invention is
The angle between the extension line of the root part and the bent part is larger than 0 °.
It is characterized by being smaller than 90 ° .
Furthermore , the liquid crystal display device according to the present invention is
The angle between the extension line of the main part and the bent part is larger than 5 °.
And is smaller than 45 ° .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a plan view showing a pixel portion of a horizontal electric field type liquid crystal display device according to Embodiment 1 of the present invention, and FIG.
FIG. 6 is a cross-sectional view showing the method of manufacturing the liquid crystal display device shown in FIG. In the figure, 1 is an insulating substrate such as a glass substrate, 2 is a gate wiring which is a plurality of scanning signal lines made of a metal such as Cr formed on the insulating substrate 1, and a plurality of video signal lines. The source wirings 12 intersect with each other. 3 is a gate electrode made of a metal such as Cr, 4 is a storage capacitor common wiring made of a metal such as Cr, 5 is a gate insulating film made of silicon nitride or the like formed so as to cover the gate wiring 2 and the storage capacitor common wiring 4. , 6 is a semiconductor film made of non-doped amorphous silicon or the like forming a thin film transistor provided at each intersection of the gate line 2 and the source line 12, and 7 is a semiconductor film 6
A contact film in which a semiconductor film such as Si is doped with an impurity such as P, which has a region 8 formed by being connected to the upper part of the active region which is a part of the film and removed by etching or the like, and 9 is a storage capacitor common wiring A storage capacitor electrode 10 provided on the gate electrode 4 via a gate insulating film 5 is a comb-shaped pixel electrode composed of a plurality of electrodes connected to a thin film transistor and provided in parallel with the source wiring 12. Or I
It is made of a transparent conductive film such as TO (Indium Tin oxide). Reference numeral 11 denotes a comb-shaped counter electrode composed of a plurality of electrodes arranged in parallel and alternately with the plurality of electrodes of the pixel electrode 10, and reference numerals 10a and 11a denote the pixel electrode 10 and the counter electrode 11.
The source wiring 12 is provided at the tip end of each of the source wirings 12 and the bent portion 13 is bent in the direction opposite to the liquid crystal alignment direction with respect to the source wiring 12.
Connected to the source electrode, 14 is a drain electrode formed in contact with the contact film 7, and 15 is an interlayer insulating film formed of a silicon nitride film or the like so as to cover the entire device,
Reference numeral 6 is a contact hole, 17 is a first wiring formed on the insulating substrate 1 using the same material as the gate wiring 2, and 18
Is a second wiring formed of the same material as the source wiring 12 on the insulating substrate 1, and 19 is the pixel electrode 1 connecting the first wiring 17 and the second wiring 18 through a contact hole.
A third wiring made of the same material as that of 0 and a conversion portion 21 are respectively shown.

In the liquid crystal display device according to the present embodiment, a liquid crystal layer is sandwiched between a pair of substrates opposed to each other with a certain distance, and a plurality of liquid crystal layers provided in parallel with the source wiring 12 on one substrate. Between the pixel electrode 10 and the counter electrode 11, there are provided a comb-shaped pixel electrode 10 made of an electrode and a comb-shaped counter electrode 11 made of a plurality of electrodes arranged in parallel and alternately with the plurality of electrodes of the pixel electrode 10. the electric field substantially parallel to an applied substrate surface voltage is a liquid crystal display device of transverse electric field type applied to the liquid crystal layer, a thin film transistor of the pixel electrode 10 in
The thin film transistor between the tip of the pixel electrode on the remote side and the counter electrode 11
The tip of the counter electrode near the transistor is almost parallel to the substrate surface.
The other electrode in the opposite direction with a gap in between,
To the pixel electrode tip and opposed electrode tips, flexion curved portion 1
0a and 11a are provided. This bent portion 10a,
11a is the source of the pixel electrode 10 and the counter electrode 11
It is formed following the root portion parallel to the wiring 12. Of the liquid crystal layer
The orientation line is the extension line of the root as shown in Fig. 1.
With respect to the counterclockwise direction, tilted by an angle θ1
Has been done. The bent portions 10a and 11a are extension lines of the root portion.
Regarding the above, on the side opposite to the alignment line of the liquid crystal,
Then, it is positioned at an angle of θe on the clockwise side.
It As a result, each bend 11a, 11a and root
The origin is the bending point with the main parts 10c and 11c, and the root part 1
On the XY plane assuming the extension line of 0c and 11c as the Y axis
Therefore, the bend and the liquid crystal alignment direction line are located in different quadrants.
It is location.

A process flow of the liquid crystal display device according to this embodiment will be described with reference to FIG. First, FIG. 2 (a)
, Cr, Al, Ti, T on the insulating substrate 1
a, Mo, W, Ni, Cu, Au, Ag or the like, an alloy containing them as a main component, a transparent conductive film such as ITO, or a multilayer film thereof is formed by a sputtering method or a vapor deposition method. The film is formed, and the gate wiring 2, the gate electrode 3, the storage capacitor common wiring 4, the first wiring 17 in the conversion portion 21, and the like are formed by photolithography and processing. Next, as shown in FIG. 2B, a gate insulating film 5 made of silicon nitride or the like is formed, and further, a semiconductor film 6 made of amorphous Si or polycrystalline poly-Si, and an n-type TFT are used. Is n + amorphous Si, n + polycrystalline poly-S, which is heavily doped with impurities such as P.
The contact film 7 made of i or the like is continuously formed by, for example, plasma CVD, atmospheric pressure CVD, or low pressure CVD. Next, the contact film 7 and the semiconductor film 6 are processed into an island shape.

Next, as shown in FIG. 2 (c), Cr, A
l, Ti, Ta, Mo, W, Ni, Cu, Au, Ag, etc., alloys containing them as a main component, translucent conductive films such as ITO, or multilayer films thereof are sputtered or vapor-deposited. After film formation by the method, the source wiring 12, the source electrode 13, the drain electrode 14, the storage capacitor electrode 9, the second wiring 18 and the like are formed by photolithography and fine processing technology. further,
The contact film 7 is etched using the source electrode 13 and the drain electrode 14 or the photoresist on which the drain electrode 14 is formed as a mask, and removed from the channel region. Then, as shown in FIG. 2D, silicon nitride or silicon oxide,
An interlayer insulating film 15 made of an inorganic insulating film or an organic resin is formed, and a contact hole 16 is formed by photolithography and subsequent etching. Finally, as shown in FIG. 2 (e), Cr, Al, Ti, Ta, Mo, W, Ni, C
The pixel electrode 10 is formed by patterning after forming u, Au, Ag or the like, an alloy containing them as a main component, a light-transmitting conductive film such as ITO, or a multilayer film thereof,
The counter electrode 11 and the third wiring 19 are formed. At this time,
As shown in FIG. 1, bent portions 10 a and 11 a that are bent in a direction opposite to the alignment direction of the liquid crystal with respect to the source wiring 12 are provided at the tip ends of the pixel electrode 10 and the counter electrode 11. The angle θe of the bent portions 10a and 11a is 0 ° <θe <
It is possible to obtain the effect at 90 °, but 5 ° <θe <
If it is designed at 45 °, even if the shape of the electrode tip changes due to manufacturing variations or the like, 0 ° <θe <90 ° can be exceeded or a short circuit with the other electrode can be suppressed. In FIG. 1, θ 1 is the angle formed by the source wiring 12 and the alignment direction of the liquid crystal molecules.

Through the above steps, the TFT substrate constituting the lateral electric field type liquid crystal display device according to the present embodiment can be manufactured. Further, a liquid crystal is sandwiched between the TFT substrate and the counter substrate and bonded with a sealing material. At this time, the liquid crystal molecules are aligned at an angle of θ1 by a method such as rubbing or photo-alignment. Any known method may be used to align the liquid crystal. Further, a gate line driving circuit, a source line driving circuit, and a storage capacitor common wiring power supply are connected to the gate wiring 2, the source wiring 12, and the storage capacitor common wiring 4, respectively, to manufacture a liquid crystal display device. In the present embodiment, the bent portions 10 a and 11 bent at the tips of both the pixel electrode 10 and the counter electrode 11 are bent in the direction opposite to the alignment direction of the liquid crystal with respect to the source wiring 12.
Although a is provided, this is because the disappearance of the abnormal alignment region of the liquid crystal due to the weighted trace occurs from the bent portion. Therefore, the disappearance time can be shortened by providing the bent portions at both ends of the pixel electrode 10 tip and the counter electrode 11 tip. Is. On the other hand, in the bent portion, the direction of the electric field is different from that in the parallel portion, so that the transmittance may decrease when displaying all white. In this case, it may be provided at the tip of either one of the pixel electrode 10 and the counter electrode 11. Also, FIG.
As shown in Fig. 1, the orientation direction θl 'of the liquid crystal molecules is
When l is opposite to the source line 12, the angle θe ′ of the bent portions 10a and 11a is also opposite to θe, and 1 ° <θe ′ <90 ° is sufficient. Further, as shown in FIG. 4, the opposing electrode 11 is provided with a protruding portion 11b that protrudes at the same angle in the same direction as the bent portion 10a at a position adjacent to the bent portion 10a provided at the tip of the pixel electrode 10. Is also good. Similarly, the pixel electrode 10 may be provided with a protruding portion 10b protruding in the same direction as the bent portion 11a at the same angle at a position adjacent to the bent portion 11a provided at the tip of the counter electrode 11.

According to the present embodiment, the direction of the electric field at the tip of the pixel electrode 10 and the counter electrode 11 can be controlled in the direction in which the liquid crystal should rotate. It is possible to return to the normal rotation direction. Therefore, the display defect caused by the load on the display surface, which is visually recognized for a long time even after the weight removal, called a load mark, can be promptly reduced, and the display quality is improved. Further, since it is not necessary to install a protective plate for preventing the display surface from being weighted, the manufacturing cost of the liquid crystal display device can be reduced. Although the structure in which the pixel electrode 10 and the counter electrode 11 are both formed in the uppermost layer has been described in the present embodiment, an insulating film such as SiN or SiO2 is formed on the pixel electrode 10 and the counter electrode 11. In that case, the same effect can be obtained even when the pixel electrode 10 and the counter electrode 11 are provided in different layers via an insulating film.

Embodiment 2. FIG. 5 is a plan view showing a pixel portion of the liquid crystal display device according to Embodiment 2 of the present invention. In the figure, the same or corresponding parts are designated by the same reference numerals,
The description is omitted. In the present embodiment, the first embodiment described above
Similarly to the above, at the tips of the pixel electrode 10 and the counter electrode 11,
Bent portions 10a and 11a that are bent in a direction opposite to the alignment direction of the liquid crystal with respect to the source wiring 12 are provided, and further, the recessed portions of the plurality of comb-shaped electrodes of the pixel electrode 10 and the counter electrode 11 are provided to the adjacent counter electrode 11 or The pixel electrode 10 is bent in parallel with bent portions 11a and 10a provided at the tip of the pixel electrode 10. That is, the angle θe2 of the concave portion is also the bending portion 10
Similar to the angle θe of a and 11a, it is possible to obtain the effect at 0 ° <θe2 <90 °, but if designed at 5 ° <θe2 <45 °, the shape of the electrode tip will change due to manufacturing variations. However, even if 0 ° <θe 2 <90 ° is exceeded, a short circuit with the other electrode can be suppressed. In FIG. 5, the bent portion 10a at the tip of the pixel electrode 10 and the concave portion of the counter electrode 11 facing the bent portion 10a, the bent portion 11a at the tip of the counter electrode 11 and the concave portion of the pixel electrode 10 facing the bent portion are all 1 ° <θe.
It shows the case where <90 °, 1 ° <θe2 <90 °. In the figure, .theta.1 is the angle formed by the source wiring 12 and the alignment direction of the liquid crystal molecules. When the direction of θ1 is opposite to the direction shown in FIG. 5 with respect to the direction of the source wiring 12, the directions of θe and θe2 may also be opposite. The other configuration and manufacturing method of the liquid crystal display device according to the present embodiment are the same as those in the above-described first embodiment, and therefore description thereof is omitted. Also in the present embodiment, the above-mentioned first embodiment
Similar to the above, effects such as improvement in display quality and reduction in manufacturing cost can be obtained.

Embodiment 3. FIG. 6 is a plan view showing a pixel portion of a liquid crystal display device according to Embodiment 3 of the present invention. In the figure, 20 is a pixel electrode 10 and a counter electrode 11.
Is a conductor formed of a light-transmitting conductive film such as a metal such as Cr or ITO, which is provided at the tip of the insulating film via an insulating film. In the figure, the same or corresponding parts are designated by the same reference numerals,
The description is omitted. The process flow of the liquid crystal display device according to the present embodiment is the same as that of the above-described first embodiment, and thus the description is omitted (see FIG. 2). However, the conductor 20
Need only be installed via the insulating film with the pixel electrode 10 and the counter electrode 11, so that the gate wiring 2 or the source wiring 1
Form at the same time as 2. Alternatively, when the material of the gate wiring 2 or the source wiring 12 is a non-transparent material, the conductor 20 is used before and after the formation of the gate wiring 2 or the source wiring 12.
It may be formed of a light-transmitting conductive film such as O. At this time, the conductor 20 and the pixel electrode 10 (or the counter electrode 1
It is possible to obtain the effect when the angle θe 3 formed by 1) is 0 ° <θe 3 <90 °, but if the design is made 5 ° <θe 3 <45 °, the shape of the electrode tip will be different due to manufacturing variations. Even if it changes, it is possible to exceed 0 ° <θe 3 <90 ° and to prevent a short circuit with the other electrode.

The conductor 20 may have a triangular shape as shown in FIG. That is, the conductor 20 may have a pattern shape in which at least one side is inclined in the direction opposite to the alignment direction of the liquid crystal with respect to the source wiring 12. Further, when the orientation of the liquid crystal is opposite to the direction of the source wiring 12 as shown in FIG. 6 or 7, the direction of θe3 is also opposite 1.
The angle should be <θe3 <90 °. Also in the present embodiment, similar to Embodiments 1 and 2, effects such as improvement in display quality and reduction in manufacturing cost can be obtained. Further, when the conductor 20 is formed of a transparent conductive film such as ITO, the aperture ratio does not decrease.

Embodiment 4. FIG. 8 is a plan view showing a pixel portion of a liquid crystal display device according to Embodiment 4 of the present invention. In the figure, 16a is a contact hole for electrically connecting the conductor 20 provided at the tip of the pixel electrode 10 and the pixel electrode 10, and 16b is electrically connecting the conductor 20 provided at the tip of the counter electrode 11 and the counter electrode 11. It is a contact hole. In the drawings, the same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the conductor 20 shown in the third embodiment is replaced by the contact hole 16a,
16b and the end portion of the pixel electrode 10 and the counter electrode 11
It is designed to be connected to the tip of the. The configuration and the process flow other than this point are the same as those in the third embodiment, and therefore the description thereof will be omitted. Also in this embodiment,
Similar to the above-described first to third embodiments, effects such as improvement in display quality and reduction in manufacturing cost can be obtained. Further, when the conductor 20 is formed of a transparent conductive film such as ITO, the aperture ratio does not decrease.

Embodiment 5. FIG. 9 is a plan view showing a pixel portion of a liquid crystal display device according to Embodiment 5 of the present invention. In the figure, 16 c is a contact hole for electrically connecting the conductor 20 provided in the recess of the counter electrode 11 and the counter electrode 11, and 16 d is an electrical connection between the conductor 20 provided in the recess of the pixel electrode 10 and the counter electrode 10. Is a contact hole connected to. In the drawings, the same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the conductor 20 shown in the third embodiment is replaced with the contact hole 1
The concave portions of the counter electrode 11 and the pixel electrode 10 are connected via 6c and 16d. The configuration and the process flow other than this point are the same as those in the third embodiment, and therefore the description thereof will be omitted. Also in the present embodiment, as in the above-described first to fourth embodiments, effects such as improvement in display quality and reduction in manufacturing cost can be obtained. Further, when the conductor 20 is formed of a transparent conductive film such as ITO, the aperture ratio does not decrease.

The effects described in the first to fifth embodiments are the same as those of the liquid crystal display device of the lateral electric field type, that is, the TFT structure, the driving system, the size of the display device, the number of pixels,
The same effect can be obtained regardless of the type of liquid crystal.

As described above, according to the present invention, the pixel electrode
It is possible to control the direction of the electric field at the tip and the tip of the counter electrode in the direction in which the liquid crystal molecules should rotate, and it is possible to quickly return the liquid crystal molecules rotating in the reverse rotation direction to the forward rotation direction by the load. As a result, a display defect caused by a load on the display surface, called a load mark that is visually recognized for a long time even after weight removal, can be promptly reduced, and the display quality can be improved. Further, since it is unnecessary to install a protective plate for preventing the display surface from being weighted, there is an effect that the manufacturing cost of the liquid crystal display device can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a pixel portion of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the method of manufacturing the liquid crystal display device in the first embodiment of the present invention.

FIG. 3 is a plan view showing a pixel portion of another liquid crystal display device according to Embodiment 1 of the present invention.

FIG. 4 is a plan view showing a pixel portion of another liquid crystal display device according to Embodiment 1 of the present invention.

FIG. 5 is a plan view showing a pixel portion of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a pixel portion of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 is a plan view showing a pixel portion of another liquid crystal display device according to Embodiment 3 of the present invention.

FIG. 8 is a plan view showing a pixel portion of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 9 is a plan view showing a pixel portion of a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 10 is a plan view showing a pixel portion of a conventional general horizontal electric field type liquid crystal display device.

FIG. 11 is a diagram illustrating a principle of generating a weighted mark, which is a problem of the conventional liquid crystal display device.

FIG. 12 is a diagram illustrating a principle of generating a weighted mark, which is a problem of the conventional liquid crystal display device.

FIG. 13 is a diagram illustrating a principle of generating a weighted mark, which is a problem of a conventional liquid crystal display device.

FIG. 14 is a diagram illustrating a principle of generating a weighted mark, which is a problem of the conventional liquid crystal display device.

FIG. 15 is a diagram illustrating a principle of generation of a weighted mark, which is a problem of the conventional liquid crystal display device.

FIG. 16 is a diagram illustrating a principle of generating a weighted mark, which is a problem of the conventional liquid crystal display device.

FIG. 17 is a diagram illustrating a principle of generating a weighted mark, which is a problem of a conventional liquid crystal display device.

[Explanation of symbols]

1 insulating substrate, 2 gate wiring, 3 gate electrode, 4
Storage capacitor common wiring, 5 gate insulating film, 6 semiconductor film, 7 contact film, 9 storage capacitor electrode, 10 pixel electrode, 10a bent portion, 10b protruding portion, 11 counter electrode, 11a bent portion, 11b protruding portion, 12 source wiring , 13 source electrode, 14 drain electrode, 15 interlayer insulating film, 16, 16a, 16b, 16c, 16d contact hole, 17 first wiring, 18 second wiring, 19 third wiring, 20 conductor, 21 converter Two
2 Alignment abnormal area.

Claims (4)

(57) [Claims] 1. A pair of substrates arranged to face each other, a liquid crystal layer sandwiched between the substrates, a plurality of scanning signal lines and a plurality of video signal lines formed on the one substrate and intersecting each other, A thin film transistor provided corresponding to an intersection of the scanning signal line and the video signal line, a pixel electrode formed of a plurality of electrodes connected to the thin film transistor, and a plurality of extending along the plurality of electrodes of the pixel electrode. A plurality of electrodes of the pixel electrode, wherein the liquid crystal display device includes a counter electrode composed of a plurality of electrodes, and applies a voltage between the pixel electrode and the counter electrode to apply an electric field substantially parallel to a substrate surface to the liquid crystal layer. Of at least one electrode of the pixel electrode at least on the side away from the thin film transistor,
At least one electrode of the plurality of electrodes of the counter electrode at least the counter electrode tip portion on the side closer to the thin film transistor is opposed to the other electrode via a gap in a direction substantially parallel to the substrate surface, Bent portions are provided at the pixel electrode tip portion and the counter electrode tip portion, respectively, and these bent portions are respectively formed following the root portions thereof, and the bending point between each of the bent portions and the root portion is the origin. Regarding the XY plane assuming the extension line of the root part as the Y axis,
A liquid crystal display device, wherein the bending direction and the alignment direction line of the liquid crystal layer are located in different quadrants. 2. The facing corresponding to the tip of the pixel electrode.
At least one of the electrodes is provided on the tip of the pixel electrode.
Form a bent part that is almost parallel to the bent part.
At least one of the pixel electrodes corresponding to the tip of the counter electrode
One of the liquid crystal display device of the electrodes to claim 1, wherein the forming a substantially parallel bent portion and the bent portion provided on the corresponding electrode tip. 3. The liquid crystal display device according to claim 1, wherein an angle between the extension line of the root portion and the bent portion is larger than 0 ° and smaller than 90 °. 4. The liquid crystal display device according to claim 1, wherein an angle between the extension line of the root portion and the bent portion is larger than 5 ° and smaller than 45 °.