JP5416926B2 - LCD panel - Google Patents

Description

  The present invention relates to an FFS (Fringe Field Switching) mode liquid crystal display panel. More specifically, the present invention relates to an FFS mode liquid crystal display panel having slit-like openings extending in a plurality of directions and having excellent unobtained viewing angle characteristics.

  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 the liquid crystal of the 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. As the horizontal electric field type liquid crystal display panel, there are known an IPS (In-Plane Switching) type in which a pair of electrodes do not overlap in a plan view and an FFS (Fringe Field Switching) type in which the electrodes overlap.

  Among these, in the FFS mode liquid crystal display panel, a pair of electrodes composed of an upper electrode and a lower electrode are arranged in different layers through an insulating film, and a slit-like opening is provided in the upper electrode. A substantially horizontal electric field passing therethrough is applied to the liquid crystal molecules. 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 the horizontal electric field type liquid crystal display panel, there is a problem that coloring occurs depending on the viewing angle direction because a slit having a constant width is used 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. 8 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 this 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 electrodes 52a and 52b driven by the TFT are rubbed. The angle formed with the direction is different for each domain. In the liquid crystal display panel 50, the common electrodes 51a and 51b and the pixel electrodes 52a and 52b are arranged by being bent in the horizontal direction and the vertical direction, respectively, thereby forming four domains. And B are made different in rubbing directions, and color conversion is compensated for in each domain to eliminate coloring.
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. Further, in the liquid crystal display panel 50 described above, four multi-domains are formed by slit-shaped openings having a constant width, so that four regions having different color conversions are generated in one sub-pixel, and good display characteristics can be obtained. There is also the problem of not.

  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

In order to achieve the above object, a liquid crystal display panel according to the present invention has a pair of substrates disposed to face each other with a liquid crystal layer interposed therebetween, and a lower electrode and a lower electrode on one side of the pair of substrates. An upper electrode formed on the surface via an insulating layer and having a plurality of slit-like openings formed for each subpixel, and an alignment film formed to cover the surface of the upper electrode and the insulating layer In the liquid crystal display panel, the plurality of slit-shaped openings include a first slit-shaped opening group including a plurality of slit-shaped openings extending in a first direction, and a first slit-shaped opening group different from the first direction. A second slit-like opening group consisting of a plurality of slit-like openings extending in the direction of 2, and the slits of the first slit-like opening group and the second slit-like opening group The opening of each slit-shaped opening in each group The slits of the different slit-shaped aperture groups are not connected to the ends of the slit-shaped apertures, but are formed independently in each group, and the first direction and the second direction are liquid crystal alignment directions in a voltage-free state, respectively. And the angle formed between the first direction and the liquid crystal alignment direction when no voltage is applied, and the angle formed between the second direction and the liquid crystal alignment direction when no voltage is applied. The absolute value of the difference is 4 ° or more and 6 ° or less .

  The liquid crystal display panel of the present invention has a pair of substrates arranged to face each other with a liquid crystal layer sandwiched therebetween, a lower electrode on one side of the pair of substrates, and an insulating layer on the surface of the lower electrode. And an upper electrode formed with a plurality of slit-shaped openings for each sub-pixel, and an alignment film formed so as to cover the surface of the upper electrode and the insulating layer. With this configuration, the liquid crystal display panel of the present invention operates in the FFS mode. In the liquid crystal display panel of the present invention, 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. In the liquid crystal display panel of the present invention, either the upper electrode or the lower electrode may operate as a pixel electrode or a common electrode. 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, transparent conductive materials such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) can be used as the upper electrode and the lower electrode.

  In the liquid crystal display panel, the light transmittance changes as a result of the change in the birefringence of the liquid crystal as the drive voltage changes. This characteristic is referred to as a voltage transmission (VT) characteristic. The variation in the light transmittance of the liquid crystal display panel due to such a change in driving voltage causes a phenomenon of coloring because the amount of variation varies depending on the wavelength of light. In the case of an FFS mode liquid crystal display panel, the VT characteristic varies depending on the angle formed by the longitudinal direction of the slit-like opening of the upper electrode and the liquid crystal alignment direction when no voltage is applied. Note that the liquid crystal alignment direction when no voltage is applied coincides with the rubbing process direction when the alignment film is subjected to the rubbing process.

  In the liquid crystal display panel of the present invention, the plurality of slit-like openings include a first slit-like opening group composed of a plurality of slit-like openings extending in the first direction, and the first direction. And a second slit-shaped aperture group composed of a plurality of slit-shaped apertures extending in a second direction different from the above. When two slit-like opening groups having different extending directions are formed, regions (domains) having different alignment directions of liquid crystal molecules are formed in the respective slit-like opening groups, so that wide viewing angle characteristics can be obtained.

  Furthermore, in the liquid crystal display panel of the present invention, the first direction of the first slit-shaped aperture group and the second direction of the second slit-shaped aperture group are respectively the liquid crystal alignment directions in the voltage-free state. The size of the corner is different. With such a configuration, the angle formed between the sides on the both sides along the length direction of each slit-shaped aperture group and the liquid crystal alignment direction when no voltage is applied is different for each slit aperture group. Have different VT characteristics. When a plurality of VT characteristics are provided for each slit-shaped aperture group, the plurality of VT characteristics are superimposed to have a VT characteristic represented by an envelope thereof, and a liquid crystal display that has good viewing angle characteristics and is less likely to be colored. You will be able to get a panel.

In the liquid crystal display panel of the present invention, the slit-like opening of the first slit-like opening group and the slit-like opening of the second slit-like opening group have an end portion of each slit-like opening in each group. , without being connected to the end portion of the slit-shaped openings of the different slit aperture groups that have been formed independently within each group. If the liquid crystal alignment direction when no voltage is applied is the same between the first slit-shaped aperture group and the second slit-shaped aperture group, the first direction and the second direction need to be different from each other. When the liquid crystal alignment direction when no voltage is applied is different between the first slit-shaped opening group and the second slit-shaped opening group, the first direction and the second direction may be the same.

  The slit-like openings of the first slit-like opening group and the slit-like openings of the second slit-like opening group are the slit-like openings of different slit-like opening groups at the end of each slit-like opening. If they are formed independently in each group without being connected to the end portion, slit-like openings can be arranged in one subpixel at high density. Therefore, according to the liquid crystal display panel of the present invention, a liquid crystal display panel with little variation in display image quality within one sub-pixel can be obtained.

Further, in the liquid crystal display panel of the present invention, the difference in angle between the liquid crystal alignment direction in the angle and the second direction and no voltage is applied between the first direction and the liquid crystal alignment direction in the absence of an applied voltage the absolute value of the Ru der less 1 ° or 7 °.

  If the absolute value of the difference between the angle between the first direction and the liquid crystal alignment direction when no voltage is applied and the angle between the second direction and the liquid crystal alignment direction when no voltage is applied is less than 1 °, Since it becomes a yellowish color at the time of display, it is not preferable. Further, when the absolute value of the angle difference is 7 ° or more, vertical stripes or horizontal stripes of unevenness can be seen due to the luminance difference on both sides of the boundary of each alignment domain in one subpixel. This is not preferable.

  In the liquid crystal display panel of the present invention, the absolute value of the difference between the angle between the first direction and the liquid crystal alignment direction when no voltage is applied and the angle between the second direction and the liquid crystal alignment direction when no voltage is applied is It is preferably 4 ° or more and 6 ° or less.

  The absolute value of the difference between the angle between the first direction and the liquid crystal alignment direction when no voltage is applied and the angle between the second direction and the liquid crystal alignment direction when no voltage is applied is 4 ° or more and 6 ° or less. In particular, the above effects of the present invention are remarkably exhibited.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below shows an example for embodying the technical idea of the present invention, and is not intended to specify the present invention to this embodiment, and is within the scope of the claims. Other embodiments included are equally applicable. 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 plan view of one sub-pixel of an FFS mode liquid crystal display panel used in each of the examples and comparative examples. 2A is a cross-sectional view taken along line IIA-IIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. FIG. 3 is a schematic diagram showing the relationship of the corners of each part of one slit-like opening shown in FIG. FIG. 4 is a graph showing the relationship between the angle between the slit-shaped opening and the liquid crystal alignment direction when no voltage is applied, and the VT characteristics. FIG. 5 is a plan view of one sub-pixel of the liquid crystal display panel according to the fifth embodiment. 6A is a cross-sectional view taken along the line VIA-VIA in FIG. 5, and FIG. 6B is a cross-sectional view taken along the line VIB-VIB in FIG. 7A is a plan view of one sub-pixel of the liquid crystal display panel according to the sixth embodiment, and FIG. 7B is a plan view of one sub-pixel of the liquid crystal display panel according to the seventh embodiment.

[Examples 1 to 4 and Comparative Examples 1 to 4]
First, as Examples 1 to 4 and Comparative Examples 1 to 4, the display image quality when the angle between the slit-shaped openings extending in different directions and the liquid crystal alignment direction in the voltage-free state is changed. We examined changes. A liquid crystal display panel 10A common to Examples 1 to 4 and Comparative Examples 1 to 4 will be described with reference to FIGS.

  The liquid crystal display panel 10A includes an array substrate AR and a color filter substrate CF. The array substrate AR crosses the surface of the display area of the first transparent substrate 11 such as a glass substrate in a state where a plurality of scanning lines 12 and signal lines 13 are insulated from each other by the gate insulating film 14. Further, common wiring (not shown) is formed at the peripheral edge of the display area. Each region surrounded by the scanning lines 12 and the signal lines 13 forms one subpixel. Further, for example, a TFT is formed as a switching element for each pixel on the first transparent substrate 11, and the entire surface of the first transparent substrate 11 including the TFT is made of, for example, a silicon nitride layer or a silicon oxide layer. Covered with a passivation film 15.

  A planarizing film 16 made of an organic material is formed on the surface of the passivation film 15, and a contact hole 17 is formed in the planarizing film 16 and the passivation film 15 at a position corresponding to the drain electrode D of the TFT. ing. On the surface of the planarizing film 16, a lower electrode 18 made of a transparent conductive material such as ITO or IZO is formed in a solid shape except for a region where the TFT is formed and a region where the contact hole 17 is formed. Is formed. The lower electrode 18 is connected to a common wiring at a peripheral portion of a display area (not shown) and operates as a common electrode.

  An insulating film 19 made of a silicon nitride layer or a silicon oxide layer is formed over the entire surface of the first transparent substrate 11 on which the lower electrode 18 is formed. On the surface of the insulating film 19, an upper electrode 22 made of a transparent conductive material such as ITO or IZO is formed in each subpixel. The upper electrode 22 is formed with a slit-shaped opening 20A having a predetermined width and bent in a “<” shape. The details of the slit-shaped opening 20A will be described later. The upper electrode 22 is electrically connected to the drain electrode D of the TFT via the contact hole 17 and operates as a pixel electrode. Note that it is arbitrary which of the upper electrode 22 and the lower electrode 19 is connected to the drain electrode D of the TFT and which is electrically connected to the common wiring. Further, the first alignment film 24 is formed over the entire display area including the surface of the upper electrode 22 and the inside of the slit-shaped opening 20A. The alignment film 24 is rubbed in a specific direction to align liquid crystal molecules in a specific direction. This rubbing process corresponds to an example for specifying the liquid crystal alignment direction in the voltage non-application state in the present invention.

  Further, as shown in FIGS. 2A and 2B, the color filter substrate CF is formed on the surface of the second transparent substrate 25 such as a glass substrate on the scanning line 12, the signal line 13, the contact hole 17 and the TFT of the array substrate AR. A light-shielding film 26 is formed so as to cover the position corresponding to. Further, a color filter layer 27 of a predetermined color is formed on the surface of the second transparent substrate 25 surrounded by the light shielding film 26. An overcoat layer 28 is formed so as to cover the surfaces of the light shielding film 26 and the color filter layer 27. A second alignment film 29 is formed on the surface of the overcoat layer 28. The second alignment film 29 is rubbed in a direction shifted by 180 ° from the first alignment film.

  The array substrate AR and the color filter substrate CF are opposed so that the upper electrode 22 of the array substrate AR and the color filter layer 27 of the color filter substrate CF are opposed to each other, and the liquid crystal 30 is sealed therebetween. Further, the first polarizing plate 31 and the backlight device (not shown) are arranged outside the array substrate AR, and the second polarizing plate 32 is arranged outside the color filter substrate CF. The liquid crystal display panel 10 used in Examples 1 to 4 is completed.

Here, the relationship between the corners of each portion of one slit-shaped opening 20A of the liquid crystal display panel 10A used in Examples 1 to 4 and Comparative Examples 1 to 4 will be described with reference to FIG. In FIG. 1, the slit-shaped opening 20A has a "<" shape with an obtuse internal angle. However, in FIG. 3, in order to clarify the relationship between each angle, the slit-like opening 20A has an "<" shape with an acute internal angle. It is shown. The portion extending toward the upper left side in FIG. 3 in this “<” shaped slit-shaped opening 20A is defined as a first slit-shaped opening group D1, and the portion extending toward the lower left side. Is a second slit-shaped opening group D2. In addition, the width | variety of each slit-shaped opening in the 1st slit-shaped opening group D1 and the 2nd slit-shaped opening group D2 is respectively made the same like the case of a prior art example. In FIG. 3, the arrow X shown in the vertical direction represents the column direction of the liquid crystal display panel 10 </ b> A, and the tilted white arrow represents the liquid crystal alignment direction R in the voltage-free state. Here, the angle formed between the alignment direction R and the first slit-shaped opening group D1 is a, the angle formed between the alignment direction R and the second slit-shaped opening group D2 is b, the arrow X and the alignment direction. If the angle formed by c is c and the clockwise direction is positive (+) in the angles a to c, the following relationship holds.
| A−b | = 2 | c |

In the liquid crystal display panels 10A used in Examples 1 to 4 and Comparative Examples 1 to 4, the shape of the "<"-shaped slit-shaped opening 20A is constant, and the liquid crystal alignment directions R in various voltage-free states are various. Eight liquid crystal display panels in which a and b were variously changed were produced by changing, and evaluated by visually recognizing the color of each liquid crystal display panel. The results are summarized in Table 1.

  From the results shown in Table 1, the following can be understood. That is, when | a−b | is less than 1 ° (Comparative Examples 1 and 2), the color becomes yellowish when halftone is displayed, and | a−b | is 7 ° or more (Comparative Examples 3 and 4). In this case, a luminance difference is generated between the first slit-shaped opening group D1 and the second slit-shaped opening group D2, and the first slit-shaped opening group D1 and the second slit-shaped opening group D2 are between. Horizontal stripes of unevenness can be seen in the part. When | a−b | is 1 ° or more (Examples 1 and 2), a yellowish color tone in a halftone starts to improve, and when | a−b | is 4 ° or more (Examples 3 and 4), the effect is improved. Is appearing greatly. Further, a good effect is obtained until | a−b | is 6 ° (Example 4), but when | a−b | exceeds 6 °, the first slit-shaped opening group D1 and the first slit group D1 are gradually increased. The difference in luminance becomes conspicuous between the first slit-shaped opening group D1 and the second slit-shaped opening group D2 when | a−b | is 7 ° (Comparative Example 3). Horizontal stripe-like unevenness due to the difference in luminance between the two was visually recognized. Therefore, if it is in the range of 1 ° ≦ | a−b | <7 °, the liquid crystal display panel has little coloration and good display image quality, but the range of 4 ° ≦ | a−b | <6 °. If it is within the range, more preferable results can be obtained.

  It is recognized that the reason why such a result is obtained is as follows. That is, the liquid crystal display panel changes the light transmittance as a result of the change in the birefringence of the liquid crystal as the drive voltage changes, as is known as the voltage transmittance (VT) characteristic. Such a change in light transmittance due to a change in drive voltage causes a phenomenon of coloring because the amount of change varies depending on the wavelength of light. In the case of an FFS mode liquid crystal display panel, the VT characteristic varies depending on the angle formed by the longitudinal direction of the slit-like opening of the upper electrode and the liquid crystal alignment direction when no voltage is applied. This relationship is shown in FIG. That is, the curves θ1 and θ2 in FIG. 4 indicate VT curves that are generated when the angles a and b (see FIG. 3) formed by the slit-shaped opening and the liquid crystal alignment direction in the state where no voltage is applied are θ1 and θ2, respectively. .

  As described above, when a plurality of VT characteristics are obtained in one sub-pixel, the observer is observed to have the VT characteristics represented by the envelope by superimposing the plurality of VT characteristics. Thus, it is possible to obtain a liquid crystal display panel in which halftone color is compensated, viewing angle characteristics are good, and color is hardly generated.

  As described above, when the two slit-shaped openings 20A having different extending directions are connected in a “<” shape, they are formed by the first slit-shaped opening group D1 and the second slit-shaped opening group D2, respectively. Domains having different alignment directions of liquid crystal molecules can go back and forth. For this reason, in the liquid crystal display panel 10A of each example, a ripple defect may occur in which an abnormal alignment region remains on one side as it is when a push test or the like is performed. However, in the liquid crystal display panel 10A of each embodiment, the first direction and the second direction of the first and second slit-shaped aperture groups each have a large angle with the liquid crystal alignment direction in the voltage-free state. Therefore, domains having different alignment directions of the liquid crystal tend to easily move to one side. Therefore, according to the liquid crystal display panel of each embodiment, it is not difficult to generate domains having different alignment directions of liquid crystal molecules, but domains having different alignment directions of liquid crystal molecules can be tilted to one side. Therefore, it is possible to make it difficult to see the abnormally oriented region and the like generated by the push test.

[Example 5]
As the liquid crystal display panels 10A of Examples 1 to 4 and Comparative Examples 1 to 4, two slit-shaped openings 20A having different extending directions are connected in a “<” shape. As the liquid crystal display panel 10B, a liquid crystal display panel 10B in which a plurality of slit-shaped openings 20B having different extending directions are individually formed is manufactured. A liquid crystal display panel 10B according to the fifth embodiment will be described with reference to FIGS. 5, 6A and 6B. However, the configuration of the liquid crystal display panel 10B of Example 5 is different from that of Examples 1 to 4 except that the configuration of the slit-shaped opening 20B is different and that the lower electrode 18 is a pixel electrode and the upper electrode 22 is a common electrode. And it is the same as that of 10 A of liquid crystal display panels of Comparative Examples 1-4. Therefore, in FIG. 5, FIG. 6A, and FIG. 6B, the same referential mark is attached | subjected to the same component as 10 A of liquid crystal display panels of Examples 1-4 and Comparative Examples 1-4, and the detailed description is abbreviate | omitted.

  In the liquid crystal display panel 10B of the fifth embodiment, the two slit-like openings 20B1 and 20B2 having different extending directions are arranged symmetrically across the orthogonal line Y at the center in the column direction of one subpixel. Has been. The liquid crystal alignment direction when no voltage is applied is inclined with respect to the orthogonal line Y as indicated by the white arrow R in FIG. In the liquid crystal display panel 10B of Example 5, the angle formed between the slit-shaped opening 20B1 and the liquid crystal alignment direction R when no voltage is applied is 2 °, and the liquid crystal alignment direction R when no voltage is applied with the slit-shaped opening 20B2. The angle between the angle and the angle was 8 °. Also in the liquid crystal display panel 10B of the fifth embodiment, it is possible to obtain a liquid crystal display panel that has the same viewing angle characteristics as those of the liquid crystal display panels of the first to fourth embodiments and is less likely to be colored.

  If the liquid crystal display panel 10B according to the fifth embodiment is configured, the liquid crystal layer is not normally driven at the closed ends formed at both ends of the slit-shaped openings 20B1 and 20B2, respectively. Although not possible, slit-like openings can be arranged in one subpixel at high density. Therefore, according to the liquid crystal display panel 10B of Example 5, a liquid crystal display panel with little variation in display image quality within one subpixel can be obtained.

[Examples 6 and 7]
In the liquid crystal display panels 10A of the first to fourth embodiments, two slit-like openings having different extending directions are connected in a “<” shape, and this “<”-like slit-like opening extends along the signal line. I showed what was there. However, the "<"-shaped slit-like opening extending in the scanning line and the one extending in the direction inclined with respect to the signal line have the same effect. FIG. 7A shows an example in which such a “<”-shaped slit-shaped opening 20 </ b> C extends along the scanning line (Example 6), and a “<->-shaped slit-shaped opening 20 </ b> D corresponds to the signal line. Those extending in an inclined direction are shown in FIG. 7B. However, the liquid crystal display panels 10C and 10D of Example 6 and Example 7 differ only in the configuration of the slit-shaped openings 20C and 20D, and the other components are the liquid crystal displays of Examples 1 to 4 and Comparative Examples 1 to 4. It is the same as the panel 10A. Therefore, in FIG. 6A and FIG. 6B, the same reference numerals are given to the same components as those of the liquid crystal display panels 10A of Examples 1 to 4 and Comparative Examples 1 to 4, and detailed description thereof is omitted.

It is a top view for 1 sub pixel of the liquid crystal display panel of the FFS mode used in the experiment example. 2A is a cross-sectional view taken along line IIA-IIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. It is a schematic diagram which shows the relationship of the angle | corner of each part of one slit-shaped opening shown in FIG. It is a graph showing the relationship between the angle | corner and the VT characteristic which a slit-shaped opening and the liquid crystal aligning direction in a voltage no application state make. FIG. 10 is a plan view of one sub pixel of the liquid crystal display panel of Example 5. 6A is a cross-sectional view taken along the line VIA-VIA in FIG. 5, and FIG. 6B is a cross-sectional view taken along the line VIB-VIB in FIG. 7A is a plan view of one sub-pixel of the liquid crystal display panel according to the sixth embodiment, and FIG. 7B is a plan view of one sub-pixel of the liquid crystal display panel according to the seventh embodiment. It is a top view for 1 sub pixel of the conventional liquid crystal display panel of a horizontal electric field system.

Explanation of symbols

  10A to 10D: liquid crystal display panel 11: first transparent substrate 12: scanning line 13: signal line 14: gate insulating film 15: passivation film 16: planarization film 17: contact hole 18: lower electrode 19: insulating film 20A 20D: slit-shaped opening 22: upper electrode 24: alignment film 25: second transparent substrate 26: light shielding film 27: color filter layer 28: overcoat layer 29: second alignment film 30: liquid crystal 31: first polarization Plate 32: Second polarizing plate D1: First slit-shaped opening group D2: Second slit-shaped opening group AR: Array substrate CF: Color filter substrate

Claims (1)

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; A liquid crystal display panel comprising: an upper electrode in which a slit-shaped opening is formed; and an alignment film formed so as to cover the surface of the upper electrode and the insulating layer,
The plurality of slit-like openings extend in a second slit direction that is different from the first slit-like opening group composed of a plurality of slit-like openings extending in the first direction. A second slit-shaped aperture group consisting of a plurality of slit-shaped apertures,
The slit-like openings of the first slit-like opening groups and the slit-like openings of the second slit-like opening groups are slit-like openings of different slit-like opening groups at the end portions of the respective slit-like openings. Without being connected to the end of each, independently formed within each group,
The first direction and the second direction have different angles with respect to the liquid crystal alignment direction when no voltage is applied,
The absolute value of the difference between the angle between the first direction and the liquid crystal alignment direction when no voltage is applied and the angle between the second direction and the liquid crystal alignment direction when no voltage is applied is 4 ° or more and 6 ° or less. Is a liquid crystal display panel.

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