JP5252422B2 - LCD panel - Google Patents

Description

The present invention relates to a horizontal electric field type liquid crystal display panel. More particularly, the present invention provides fringe field switching with good viewing angle characteristics and less coloration.
: Hereinafter referred to as “FFS”. ) Mode liquid crystal display panel.

Liquid crystal display panels are characterized by their light weight, thinness, and low power consumption compared to CRTs (cathode ray tubes), and are therefore used in many electronic devices for display purposes. The liquid crystal display panel displays an image by changing the direction of liquid crystal molecules aligned in a predetermined direction by an electric field by rubbing the alignment film, thereby changing the amount of light transmitted or reflected.

As a method of applying an electric field to a liquid crystal layer of a liquid crystal display panel, there are a vertical electric field type and a horizontal electric field type. A vertical electric field type liquid crystal display panel applies a substantially vertical electric field to liquid crystal molecules by a pair of electrodes arranged with a liquid crystal layer interposed therebetween. Known examples of the vertical electric field type liquid crystal display panel include a TN (Twisted Nematic) mode, a VA (Vertical Alignment) mode, and an MVA (Multi-domain Vertical Alignment) mode. A horizontal electric field type liquid crystal display panel is provided with a pair of electrodes insulated from each other on one inner surface side of a pair of substrates disposed with a liquid crystal layer interposed therebetween, and a substantially horizontal electric field is applied to liquid crystal molecules. To be applied. This horizontal electric field type liquid crystal display panel has an IP in which a pair of electrodes do not overlap in a plan view.
An S (In-Plane Switching) system and an overlapping FFS (Fringe Field Switching) system are known.

Among these, in the FFS mode liquid crystal display panel, a pair of electrodes consisting of an upper electrode and a lower electrode are arranged in different layers with an insulating film interposed therebetween, and a slit-like opening is provided in the upper electrode, and generally passes through this slit. A horizontal electric field is applied to the liquid crystal layer. The FFS mode liquid crystal display panel is widely used in recent years because it can obtain a wide viewing angle and improve image contrast. However, in a horizontal electric field type liquid crystal display panel, a slit having a constant width is used for each sub-pixel.
There is a problem that coloring occurs depending on the viewing angle direction due to the VT characteristic for each sub-pixel. Attempts have been made to divide the rubbing direction into a plurality of pixels within one pixel for the purpose of improving viewing angle characteristics and reducing coloring in such a horizontal electric field type liquid crystal display panel (see Patent Document 1 below). Here, a liquid crystal display panel disclosed in Patent Document 1 below will be described with reference to FIG.

FIG. 10 is a schematic plan view of one sub-pixel of a horizontal electric field type liquid crystal display panel disclosed in Patent Document 1 below.

In the horizontal electric field type liquid crystal display panel 50, one subpixel is divided into four domains IA, IIA, IIIB, and IVB, and the common electrodes 51a and 51b and the pixel electrode 5 driven by the TFT are provided.
The angle formed between 2a and 52b and the rubbing direction is different in each domain. In the liquid crystal display panel 50, the common electrodes 51a and 51b and the pixel electrode 52a
, 52b are bent in the horizontal direction and the vertical direction, respectively, to form four domains, and further, the rubbing directions in areas A and B of one subpixel are made different so that color conversion is mutually compensated in each domain. In this way, the coloring is eliminated.
JP 2005-196118 A

According to the above-described conventional horizontal electric field type liquid crystal display panel 50, it is possible to expect an improvement in viewing angle characteristics and a reduction in coloring. However, in the case of the above-described liquid crystal display panel 50, there is a technical difficulty in that the rubbing direction must be divided into a plurality of areas within a narrow area of one subpixel. Furthermore, in the above-described liquid crystal display panel 50, four multi-domains are formed by slits having a constant width, so that four regions are generated in one sub-pixel, and good display characteristics cannot be obtained due to disclination. There are also problems.

The present invention has been made to solve the above-described problems of the conventional horizontal electric field type liquid crystal display panel, and an object thereof is to provide an FFS mode liquid crystal display panel having good viewing angle characteristics and little coloration. And

  According to one aspect of the present invention for solving the above-described problems, a pair of substrates disposed opposite to each other with a liquid crystal layer interposed therebetween is provided, and a lower electrode and a surface of the lower electrode are disposed on one side of the pair of substrates. A liquid crystal display panel comprising: an upper electrode formed through an insulating layer and having a plurality of slits formed for each sub-pixel; and an alignment film formed so as to cover the surface of the upper electrode and the insulating layer. The plurality of slits have slit-like openings having different widths at both end portions in the length direction and closed at both end portions in the length direction. In any case, the liquid crystal display panel is formed along a direction inclined at a predetermined angle with respect to an axis corresponding to the length direction of the slit so as to intersect all sides corresponding to the length direction of the slit. Is provided.

The liquid crystal display panel operates in the FFS mode. The lower electrode may be formed on the surface of an interlayer film made of a resin film, or may be formed on the surface of a transparent substrate such as a glass substrate. Further, as the insulating film formed on the surface of the lower electrode, an inorganic insulating film such as silicon oxide or silicon nitride is used, but silicon nitride is desirable from the viewpoint of insulation. Further, as the upper electrode and the lower electrode, a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) can be used.

As the driving voltage applied to the liquid crystal layer changes, the light transmittance of the liquid crystal display panel changes. This characteristic is referred to as a voltage transmission (VT) characteristic. The variation in the light transmittance due to such a change in the driving voltage varies depending on the wavelength of the light, resulting in a phenomenon of coloring. Also,
In the case of the FFS mode liquid crystal display panel, the voltage applied to the liquid crystal layer and the light transmittance of the liquid crystal layer are determined by the angle between the rubbing direction and the longitudinal direction of the slit of the upper electrode. The relationship, that is, the VT characteristic varies.

In the liquid crystal display panel has a plurality of slits has a configuration in which the width is different at both ends in the length direction. When such a configuration is provided, the angle formed between the sides on the both sides along the length direction of each slit and the rubbing direction is different. Further, since the width of the slit and the electrode portion between the slits sequentially changes along the length direction, the VT characteristic is shifted in each width portion, and thus a plurality of different VT characteristics are provided for each slit. It will be. When a plurality of VT characteristics are provided for each slit, the plurality of VT characteristics are superimposed and have a VT characteristic represented by an envelope thereof. Therefore, according to the above-mentioned liquid crystal display panel, a wide range of VT characteristics are provided, so that it is possible to obtain a liquid crystal display panel that has good viewing angle characteristics and is less likely to be colored .

  The slit has a width from one end portion in the length direction to the other end portion in the length direction from the first portion formed with the same width as the one end portion and a connection portion between the first portion and the slit. You may form with the 2nd part formed so that it may increase or decrease. With this configuration, one type of angle formed by the rubbing direction and the first portion side is obtained for the side of the slit along the length direction, and two types of angles formed by the rubbing direction and the second portion side are obtained. can get. Accordingly, three types of VT characteristics corresponding to the three types of crossing angles are obtained, and a wide range of VT characteristics obtained by superimposing these are the VT characteristics of the liquid crystal display panel, so that the viewing angle characteristics are further improved.

According to the above-mentioned liquid crystal display panel, since both end portions in the length direction of the plurality of slit-shaped openings are closed, the shape of the slit end portions can be finely formed, so that the reverse domain hardly occurs. Thus, a high-quality liquid crystal display panel can be provided.

In the above liquid crystal display panel, slits are about an axis corresponding to the length direction of the slits, it is preferable that the slits of the sides along the length direction is formed asymmetrically.

Slits, the slits around an axis corresponding to the longitudinal direction, the slits of the sides along the length direction is asymmetric, substantially on both sides along the length of each slit The angle formed by the side and the rubbing direction will be different. Moreover, since the angle formed between the sides on the both sides along the length direction of each slit and the rubbing direction can be set to an arbitrary plural value, plural VT characteristics determined by these angles can be arbitrarily set. Can be set. Therefore, the visual field angle characteristic is improved, it is possible to obtain a more hardly occurs LCD panel colored.

In the above liquid crystal display panel, slits are preferably slits the slits of sides along the lengthwise direction is provided with a bent portion bent in a direction away from each other.

Slits, the slits of the slits along the length of the sides is provided with a bent portion bent in a direction away from each other, and both sides of the edges and the rubbing direction along the length of each slit There are at least three types of angles. Therefore, according to the liquid crystal display panel of this aspect, since at least three types of VT characteristics are provided for each slit, a viewing angle characteristic is improved and a liquid crystal display panel that is less likely to be colored is obtained. Will be able to.

In the above liquid crystal display panel, slits are preferably provided with a plurality of sets of the pair of slits that are different shapes from each other.

A pair of slits having different shapes differs depending on the shape of each slit, but each pair of slits has at least two types of VT characteristics. Therefore, the visual field angle characteristic is improved, it becomes possible to obtain a hardly occurs LCD panel colored. Further, since more slits can be arranged, the transmittance is improved.

In the above liquid crystal display panel, a set of a pair of slits are preferably disposed by mutually inverted as an axis center in a direction perpendicular to the slits of the same shape of slits and the length direction.

When arranged to be mutually inverted as an axis center in a direction perpendicular to the slits of the pair of identical shape slits the lengthwise direction, a pair of slits shapes differ from each other in one sub-pixel, a number, with respect to the axis It becomes possible to arrange symmetrically. With such a configuration, at least two types of VT characteristics are provided for each pair of slits, and many slits can be arranged in one sub-pixel, and the light emission state of the liquid crystal also symmetrical center in a direction orthogonal to the lengthwise direction of the slits as a shaft. Therefore, the visual field angle characteristics become good, the display quality becomes possible to obtain a good and hard liquid crystal display panel caused colored with high aperture ratio.

In the above liquid crystal display panel, the set of the pair of slits are those which are disposed to be mutually inverted as the axial direction of the center perpendicular to the longitudinal direction of the slits the slit shape are different from each other It is preferable.

When arranged to be mutually inverted the center of the direction orthogonal axes a pair of slits shapes together to differences slits the lengthwise direction, a pair of slits shapes differ from each other in one sub-pixel, a number, a shaft It becomes possible to arrange symmetrically. With such a configuration, at least three types of VT characteristics are provided for each pair of slits, and many slits can be arranged in one sub-pixel, and the light emission state of the liquid crystal also symmetrical center in a direction orthogonal to the lengthwise direction of the slits as a shaft. For example, when the sides forming one slit are not formed in parallel, four types of VT characteristics can be provided. Therefore, the visual field angle characteristic is improved, it is possible that the display quality is obtained and the resulting difficulty liquid crystal display panel with good and color.

In the above liquid crystal display panel, a set of a pair of slits is preferably joined along their edges along the length of the adjacent slits is formed so as to be parallel to each other.

In a pair of slits, when the sides along the length direction of adjacent slits are formed so as to be parallel to each other, the pair of slits have complementary shapes. With such a configuration, asymmetrical slits are also included with the center in the direction orthogonal to the length direction of the slit as an axis, but at least 2 to 4 types of VT characteristics for each pair of slits. In addition, a large number of a pair of slits having different shapes can be effectively arranged in one sub-pixel. Therefore, the visual field angle characteristic is improved, it is possible to transmittance obtain hardly occurs LCD panel colored high.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal display panel for embodying the technical idea of the present invention, and is not intended to specify the present invention for this liquid crystal display panel. The present invention can be equally applied to the other embodiments included in the scope. Also, in each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions.

FIG. 1 is a schematic cross-sectional view illustrating the operating principle of the liquid crystal display panel of the present invention. FIG.
2B is a plan view of the upper electrode for one pixel according to the embodiment of FIG. 1, and FIG. 2B is an enlarged view for explaining an angle formed by one slit of FIG. 2A and the rubbing direction. FIG. 3 is a graph showing the VT characteristic of the long side of the slit according to the first embodiment. 4A is a plan view of the upper electrode for one pixel of the second embodiment, and FIG. 4B is an enlarged view for explaining an angle formed by one slit of FIG. 4A and the rubbing direction.
FIG. 5A is a plan view of the upper electrode for one pixel according to the third embodiment, and FIG. 5B is an enlarged view for explaining an angle formed by one slit of FIG. 5A and the rubbing direction. FIG. 6 is a graph showing a VT curve of the long side of the slit according to the third embodiment. FIG. 7A is a plan view of an upper electrode for one pixel according to the fourth embodiment, and FIG. 7B is an enlarged view for explaining an angle formed by a pair of slits in FIG. 7A and a rubbing direction. FIG. 8A is a plan view of the upper electrode for one pixel of the fifth embodiment, and FIG. 8B is an enlarged view for explaining an angle formed by a pair of slits in FIG. 8A and the rubbing direction. FIG. 9 shows the fifth
It is a graph showing the VT curve of the long side of the slit of embodiment.

First, the operation principle of the FFS mode liquid crystal display panel common to the embodiments of the present invention is shown in FIG.
Will be described. The FFS mode liquid crystal display device 10 includes an array substrate AR and a color filter substrate CF. The array substrate AR is provided with a plurality of scanning lines and common wirings in parallel on the surface of the first transparent substrate 11, and a plurality of signal lines (all not shown) are arranged in a direction intersecting the scanning lines and the common wirings. Is provided. A lower electrode 15 formed of a transparent material such as ITO or IZO connected to the common wiring is provided so as to cover each of the regions partitioned by the scanning lines and the signal lines. Therefore, here, the lower electrode 15 operates as a common electrode. An upper electrode 18 made of a transparent material such as ITO, in which a plurality of slits 17 are formed in a stripe shape via an insulating film 16, is provided on the surface of the lower electrode 15. The surfaces of the upper electrode 18 and the plurality of slits 17 are covered with an alignment film 20. In addition,
The upper electrode 18 is connected to a switching element (not shown) such as a TFT (Thin Film Transistor) and operates as a pixel electrode.

Further, the color filter substrate CF has a color filter layer 23 on the surface of the second transparent substrate 22.
The overcoat layer 24 and the alignment film 25 are provided. Then, the upper electrode 18 and the lower electrode 15 of the array substrate AR and the color filter layer 23 of the color filter substrate CF.
The array substrate AR and the color filter substrate CF are made to face each other so that they face each other. Next, the liquid crystal LC is sealed between the array substrate AR and the color filter substrate CF, and the polarizing plates 26 and 27 are disposed outside the substrates AR and CF, respectively, thereby forming the FFS mode liquid crystal display device 10. The

In the FFS mode liquid crystal display device 10, when an electric field is formed between the upper electrode 18 and the lower electrode 15, the electric field is directed to the lower electrode 15 on both sides of the upper electrode 18 as shown in FIG. 1. Therefore, not only the liquid crystal present in the slit 17 but also the liquid crystal present on the upper electrode 18 can be driven. Therefore, the FFS mode liquid crystal display device 10 has a wide viewing angle and high contrast, and further has a feature that bright display is possible because of high transmittance. In addition, the FFS mode liquid crystal display device 10 has a large overlap area between the upper electrode 18 and the lower electrode 15 in a plan view, so that a larger storage capacity is generated as a secondary effect, and there is no need to separately provide an auxiliary capacity line. There are also advantages.

[First Embodiment]
The configuration of the upper electrode 18a for one subpixel in the liquid crystal display panel 10A of the first embodiment will be described with reference to FIGS. 2A and 2B. The upper electrode 18a has a rectangular shape, and is drawn horizontally in FIG. 2A. A plurality of slits 17a having the same shape are formed in the upper electrode 18a. The slit 17a is substantially vertically long, and the short side facing each other is the first short side 31, the second short side 32, and the left long side of the pair of long sides is the first long side. 33, the long side on the right side is referred to as the second long side 34. The first and second long sides 33 and 34 of the slit 17a and the rubbing direction R (equal to the alignment direction of the liquid crystal when no electric field is applied) intersect each other. As shown in FIG. 2B, the angle between the first and second long sides 33 and 34 of the slit 17a and the rubbing direction R is θ1, the angle between the long side 33 on the left side and the rubbing direction R is The angle formed by the long side 34 and the rubbing direction R is θ2, and θ1 ≠ θ2. The slit 17a is symmetric with respect to the central axis Ya with respect to the long side direction. That is, assuming that the bisector of the second short side 32 of the slit 17a is the central axis Ya, the lengths of the portions located on both sides of the central axis Ya of the first short side 31 are X1 and X2, respectively. , X1 = X2 holds.

In the FFS mode liquid crystal display panel, the VT characteristic varies depending on the angle between the long side of the slit and the rubbing direction, and the distance between the slit width and the adjacent slit. Therefore, as shown in FIG. 3 , one slit 17a of the upper electrode 18a has both a VT characteristic (shown as θ1) by the left long side 33 and a VT characteristic by the right long side 34 (shown as θ2). It becomes like this. Therefore, according to the liquid crystal display panel 10 </ b> A of the first embodiment, as shown in FIG. 3, it is observed that the observer has a VT characteristic represented by an envelope of both VT characteristics. Become. Even if each VT characteristic has a yellowish color, when it is yellowish in a certain area, the other VT characteristic areas do not have a yellowish color, and the colors compensate for each other's characteristics. Colored phenomena can be suppressed.

Here, as shown in FIG. 2, the left side and the right side of the slit are inclined to the same side with respect to the rubbing direction to make an intersecting angle. However, as an embodiment, the left side and the right side are relative to the rubbing direction. You can lean to the other side. In that case, since the rotation directions of the liquid crystal near the left side and the right side are different, in addition to the effect of color compensation by different VT characteristics as in the example, it is also used to compensate for the change in color depending on the viewing angle. A big effect is acquired. The same effect can be obtained in the following embodiments by setting the rubbing angle in the same manner.

[Second Embodiment]
The configuration of the upper electrode 18b for one subpixel in the liquid crystal display panel 10B of the second embodiment will be described with reference to FIGS. 4A and 4B. 4A and 4B, the same components as those of the liquid crystal display panel 10A of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The upper electrode 18b has an angle formed between the first and second long sides 33 and 34 of the slit 17b and the rubbing direction R, as shown in FIG. 4B, and the left long side 33 and the rubbing direction R.
When the angle between the long side 34 on the right side and the rubbing direction R is θ2,
It is the same as the case of the liquid crystal display panel 10A of the first embodiment in that θ1 ≠ θ2. However, the slit 17b of the upper electrode 18b has a central axis Y with respect to the long side direction.
The liquid crystal display panel 10 of the first embodiment is that it is asymmetric with respect to b.
The configuration is different from A.

That is, assuming that the bisector of the second short side 32 of the slit 17b is the central axis Yb, the lengths of the portions located on both sides of the central axis Yb of the first short side 31 are X1 and X2, respectively. , X1 ≠ X2 holds. With such a configuration, each slit 1
Since the angles θ1 and θ2 formed between the long sides 33 and 34 on both sides along the length direction 7b and the rubbing direction R can be set to any arbitrary values, a plurality of VTs determined by these angles can be set. The characteristics can be set arbitrarily. Even with this configuration, the VT characteristic having the same tendency as that of the upper electrode 18a in the liquid crystal display panel 10A of the first embodiment is provided. Therefore, also in the liquid crystal display panel 10B of the second embodiment,
The same effects as those of the liquid crystal display panel 10A of the first embodiment are achieved.

[Third Embodiment]
The configuration of the upper electrode 18c for one subpixel in the liquid crystal display panel 10C of the third embodiment will be described with reference to FIGS. 5A and 5B. 5A and 5B, the same reference numerals are given to the same components as those of the liquid crystal display panel 10A of the first embodiment, and detailed description thereof is omitted. The slit 17c formed in the upper electrode 18c is formed so that the long sides 33 and 34 on both sides in the long side direction have partially parallel portions or portions extending in different directions, and It is formed so as to be symmetric with respect to the central axis Yc with respect to the long side direction. With such a configuration, the long sides 33 and 34 intersect the rubbing direction at three different angles θ1, θ2, and θ3 as shown in FIG. 5B. As a result, as shown in FIG. 6, the liquid crystal display panel 10 </ b> C of the third embodiment is observed by the observer as having a VT characteristic represented by an envelope of three VT characteristics. . Even if each VT characteristic has a yellowish color, when it is yellowish in a certain area, the other VT characteristic areas do not have a yellowish color, and the colors compensate for each other's characteristics. The coloring phenomenon can be further suppressed.

[Fourth Embodiment]
The configuration of the upper electrode 18d for one subpixel in the liquid crystal display panel 10D of the fourth embodiment will be described with reference to FIGS. 7A and 7B. 7A and 7B, the same reference numerals are given to the same components as those of the liquid crystal display panel 10A of the first embodiment, and detailed description thereof is omitted. The upper electrode 18d includes a plurality of sets of a pair of slits 17d1 and 17d2 in which slits having the same shape are reversed. Among these, one slit 17d1 has the same shape as the slit 17a of the liquid crystal display panel 10A of the first embodiment.
The other slit 17d2 is slit 1 with respect to the central axis Xd in the direction orthogonal to the length direction.
For example, 7d1 is vertically inverted in FIG. 7B.

With such a configuration, a large number of a pair of slits 17d1 and 17d2 having different shapes in one subpixel can be arranged symmetrically with respect to the central axis Xd. In addition, many slits can be arranged in one subpixel, and the light emission state of the liquid crystal is also symmetric with respect to the central axis Xd in the direction orthogonal to the length direction of the slits 17d1 and 17d2. Therefore, according to the liquid crystal display panel 10D of the fourth embodiment, the viewing angle characteristics are improved, the transmittance is improved, the display image quality is good, and the liquid crystal display panel is hardly colored.

[Fifth Embodiment]
The configuration of the upper electrode 18e for one subpixel in the liquid crystal display panel 10E of the fifth embodiment will be described with reference to FIGS. 8A and 8B. 8A and 8B, the same components as those of the liquid crystal display panel 10D of the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The upper electrode 18e has a pair of slits 17e1 and 1e having different shapes.
Multiple sets of 7e2 are provided. Among these, one slit 17e1 has the same shape as the slit 17c of the liquid crystal display panel 10C of the third embodiment, but the other slit 17e.
2 has a long side 33 ′ on the left side and a right side 34 ′ on the right side 3 of one slit 17e1.
4 and the left long side 33 are formed to be parallel to each other.

Such a configuration is a shape generally referred to as a complementary shape, and is asymmetric with respect to the central axis Xe in the direction orthogonal to the length direction of the slits 17e1 and 17e2, and for each sub-pixel. 17e1 and 17e2 can be arranged in a large number of slits. Moreover, as shown in FIG. 8B, each pair of slits intersects the rubbing direction at at least three angles of θ1 to θ3. As a result, as shown in FIG. 9, the liquid crystal display panel 10E of the fifth embodiment has three VT characteristics of θ1 to θ3, and is displayed to the observer by an envelope of the three VT characteristics. Will be observed as having a VT characteristic. Further, for example, long sides 33 and 34 forming slits 17e1 and 17e2,
When the long sides 33 ′ and 34 ′ are not formed in parallel in the same slit, the angles formed by the long sides 33 and 34, the long sides 33 ′ and 34 ′ and the rubbing direction R are 4 of θ1 to θ4.
It has two VT characteristics. Even if each VT characteristic has a yellowish tint, if it is yellowish in a certain area, the other VT characteristic areas do not have a yellowish tint. The phenomenon can be suppressed.

The slit shape of the present invention has a structure in which the widths at both ends of the slit are different. By adopting this structure, the VT characteristic changes due to the difference in width, so not only the angle formed with the rubbing angle but also the slit. Depending on the width, it has a plurality of VT characteristics, and these multiple characteristics can compensate for each other's color reduction and suppress the coloring phenomenon, thereby providing a high-quality liquid crystal display panel. It becomes possible.

FIG. 1 is a schematic cross-sectional view illustrating the operating principle of the liquid crystal display panel of the present invention. FIG. 2A is a plan view of the upper electrode for one pixel of the first embodiment, and FIG. 2B is an enlarged view for explaining an angle formed by one slit of FIG. 2A and the rubbing direction. It is a graph showing the VT curve of the long side of the slit of 1st Embodiment. 4A is a plan view of the upper electrode for one pixel of the second embodiment, and FIG. 4B is an enlarged view for explaining an angle formed by one slit of FIG. 4A and the rubbing direction. FIG. 5A is a plan view of the upper electrode for one pixel according to the third embodiment, and FIG. 5B is an enlarged view for explaining an angle formed by one slit of FIG. 5A and the rubbing direction. It is a graph showing the VT curve of the long side of the slit of 3rd Embodiment. FIG. 7A is a plan view of an upper electrode for one pixel according to the fourth embodiment, and FIG. 7B is an enlarged view for explaining an angle formed by a pair of slits in FIG. 7A and a rubbing direction. FIG. 8A is a plan view of the upper electrode for one pixel of the fifth embodiment, and FIG. 8B is an enlarged view for explaining an angle formed by a pair of slits in FIG. 8A and the rubbing direction. It is a graph showing the VT curve of the long side of the slit of 5th Embodiment. FIG. 11 is a schematic plan view showing the arrangement and rubbing direction of electrodes in one sub-pixel of a conventional horizontal electric field type liquid crystal display panel.

Explanation of symbols

10, 10A to 10E: Liquid crystal display panel 11: First transparent substrate 15: Lower electrode 16:
Insulating films 17, 17a to 17e: Slits 18, 18a to 18e: Upper electrode 20: Alignment film 22: Second transparent substrate 23: Color filter layer 24: Overcoat layer 25:
Alignment films 26 and 27: Polarizing plate 31: First end portion 32: Second end portion 33, 33 ′: Left long side 34, 34 ′: Right long side AR: Array substrate CF: Color filter substrate
R: rubbing direction

Claims (8)

A pair of substrates disposed opposite to each other with a liquid crystal layer sandwiched therebetween; a lower electrode formed on one surface of the pair of substrates via an insulating layer on a surface of the lower electrode; an electrode on which slits are formed, and an alignment film formed so as to cover the surface of the upper electrode and the insulating layer, a liquid crystal display panel having,
The plurality of slits have slit-like openings with different widths at both ends in the length direction, and both ends in the length direction are closed,
The rubbing direction of the alignment film is predetermined with respect to an axis corresponding to the length direction of the slit so that all of the plurality of slits intersect all sides corresponding to the length direction of the slit. Formed along a direction inclined at an angle
LCD display panel. The slit has a width from one end portion in the length direction to a first portion formed with the same width as the one end portion, and a connection portion between the first portion and the other end portion in the length direction. Formed by a second portion formed to increase or decrease
  The liquid crystal display panel according to claim 1. The slit has an asymmetrical side of the slit along the length direction with an axis corresponding to the length direction of the slit as a center.
The liquid crystal display panel according to 請 Motomeko 1. The slit includes a bent portion that is bent in a direction in which the sides of the slit along the length direction of the slit are separated from each other.
The liquid crystal display panel according to 請 Motomeko 1. The slit includes a plurality of pairs of slits having different shapes.
The liquid crystal display panel according to 請 Motomeko 1. The pair of slits is arranged by reversing the same-shaped slits around the center in the direction orthogonal to the length direction of the slits as an axis.
The liquid crystal display panel according to 請 Motomeko 5. The pair of slits are arranged by inverting slits having different shapes from each other around the center in the direction orthogonal to the length direction of the slits.
The liquid crystal display panel according to 請 Motomeko 5. The pair of slits is formed such that sides along the length direction of adjacent slits are parallel to each other.
The liquid crystal display panel according to any one of 請 Motomeko 5-7.

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