JP2002350884A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display which can improve a manufacturing yield by expanding a margin of joining accuracy of a pair of substrates, and also has favorable display quality. SOLUTION: An array substrate 100 comprises switching elements 121 formed on an insulating board 11, an insulating film 24 deposited covering the switching elements 121, and pixel electrodes 151 arranged at each pixel on the insulating film 24 and connected with the switching elements 121 via contact holes formed on the insulating film 24. At least a part of end parts of each pixel electrode 151 has a narrower gap between itself and a counter electrode 204 compared with the other area, and also the pixel electrode 151 has a notched part 145 inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a multi-domain structure.

[0002]

2. Description of the Related Art Liquid crystal display devices have features such as light weight, thin shape, and low power consumption.
It is applied to various fields such as television. In particular, a thin film transistor, that is, a TFT (Thin Film)
A liquid crystal display device using a transistor is used as a monitor for displaying data including a lot of information such as a portable television and a computer because of its responsiveness.

In recent years, with an increase in the amount of information, an improvement in the definition and display speed of an image has been demanded. The improvement in definition has been dealt with by making the array structure of the array substrate on which the TFTs are arranged finer. On the other hand, in a liquid crystal layer that performs light switching, the response speed of a liquid crystal material is required to be two to several tens of times faster than that of a current mode because the operation speed per unit time is shortened with the miniaturization of pixels. Is done.

[0004] As a liquid crystal mode satisfying these requirements,
VAN (Vertical Aligned Nema)
tic) method is being studied.

In the VAN type alignment mode, a higher response speed than the conventional twisted nematic type (TN) mode can be obtained, and the rubbing alignment process which has been concerned about the occurrence of a defect such as electrostatic breakdown due to the adoption of the vertical alignment process. In recent years, it has attracted attention because the process can be eliminated.

In the VAN type alignment mode, it is easy to design a compensation for a viewing angle, and a wide viewing angle can be obtained by employing a multi-domain system in which a liquid crystal layer is divided into a plurality of domains having different tilt directions of liquid crystal molecules. Obtainable. In this case, in order to control the alignment of the liquid crystal molecules, for example, notches or protrusions are formed on both of the pair of substrates.

For example, an active matrix type color liquid crystal display device is configured by sandwiching a liquid crystal layer between an array substrate having pixel electrodes and a counter substrate having counter electrodes. A color filter layer composed of a colored resin layer colored in three primary colors is disposed on either the array substrate or the counter substrate. A spacer is provided between these two substrates to keep the distance between the pixel electrode and the counter electrode constant. The pair of substrates is attached to each other with an adhesive printed around the substrates except for the liquid crystal injection port.

[0008]

However, in the above-mentioned multi-domain type VAN type alignment mode liquid crystal display device, after forming a notch or a projection on each of the two substrates, the two substrates are arranged in a predetermined arrangement. If the substrates are not attached to each other, the areas of the domains for compensating for the viewing angle may differ greatly from each other. For this reason, there is a possibility that a problem such as generation of display unevenness or reduction in transmittance may occur.

[0009] Further, since the margin of bonding accuracy of the pair of substrates is small, the production yield may be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to increase the manufacturing yield by expanding the margin of bonding accuracy of a pair of substrates, and to improve the display yield. An object of the present invention is to provide a high-quality liquid crystal display device.

[0011]

In order to solve the above-mentioned problems and to achieve the object, a first aspect of the present invention is directed to a plurality of switching elements formed on a substrate and a plurality of switching elements respectively connected to the plurality of switching elements. An array substrate having pixel electrodes, an opposing substrate disposed opposite to the array substrate, having an opposing electrode opposing the plurality of pixel electrodes, and disposed in a gap between the array substrate and the opposing substrate. And a liquid crystal composition having a negative dielectric anisotropy, wherein at least a part of the edge of each of the pixel electrodes has an interval with the counter electrode as compared with other regions. The pixel electrode is narrow and has a cutout portion therein.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the liquid crystal display device of the present invention will be described below with reference to the drawings.

A liquid crystal display device of the present invention, for example, an active matrix type liquid crystal display device has a liquid crystal display panel 10.

That is, as shown in FIG. 1, the liquid crystal display panel 10 includes an array substrate 100 and the array substrate 10.
0 and the array substrate 10
Liquid crystal composition 30 disposed between the first substrate 0 and the opposite substrate 200
0. In such a liquid crystal display panel 10, the display area 102 for displaying an image is
00 and the counter substrate 200 are formed in a region surrounded by the outer edge seal member 106 for bonding the counter substrate 200 to the counter substrate 200. Peripheral region 104 arranged along the outer periphery of display region 102
Is formed in a region outside the outer edge sealing member 106 and has a light shielding region formed in a frame shape.

In the display area 102, as shown in FIGS. 1 and 2, the array substrate 100 includes m × n pixel electrodes 151 arranged in a matrix,
The scanning lines Y corresponding to m scanning lines Y formed along one row direction, n signal lines X formed along the column direction of these pixel electrodes 151, and mxn pixel electrodes 151. And m × n thin film transistors, ie, pixels T, arranged as switching elements near the intersection of the signal lines X
FT121 is provided.

In the peripheral region 104, the array substrate 100 has a scanning line driving circuit 18 for driving m scanning lines Y, a signal line driving circuit 19 for driving n signal lines X, and the like. .

As shown in FIG. 1, the liquid crystal capacitance CL is formed by the pixel electrode 151, the counter electrode 204, and the liquid crystal layer 300 sandwiched between these electrodes. The auxiliary capacitance Cs is formed electrically in parallel with the liquid crystal capacitance CL. The auxiliary capacitance Cs is formed by a pair of electrodes disposed opposite each other via an insulating film, that is, an auxiliary capacitance electrode 61 having the same potential as the pixel electrode 151 and an auxiliary capacitance line 52 set to a predetermined potential. .

As shown in FIG. 3, the liquid crystal display device includes a liquid crystal composition 30 between an array substrate 100 and a counter substrate 200.
A transmission type liquid crystal display panel 10 having a “0” pinched therebetween is provided.

Array substrate 100 of liquid crystal display panel 10
In the display area 102, a switching element formed corresponding to a plurality of pixels arranged in a matrix on the transparent insulating substrate 11 such as a glass substrate, that is, a display area 102 including a pixel TFT 121 and a pixel TFT 121. Color filter layer 24 formed to cover
(R, G, B), a pixel electrode 151 arranged for each pixel on the color filter layer 24, a plurality of columnar spacers 31 formed on the color filter layer 24 (see FIG. 2), and a plurality of pixel electrodes 151 An alignment film 13A is formed so as to cover the whole.

The color filter layer 24 has a thickness of, for example, about 3.0.
It has a thickness of μm, is colored green (G), blue (B), and red (R), and is arranged for each pixel. The color filter layers 24 are formed of three colored resin layers that transmit light of each color component of green, blue, and red, respectively.

The pixel electrode 151 is formed of ITO (Indium Tin Oxide) formed on the color filter layers 24G, 24B, and 24R assigned to them.
And the like, and are connected to the pixel TFTs 121 through through holes 26 penetrating the color filter layer 24.

Each pixel TFT 121 is connected to a scanning line Y formed along a row of the pixel electrodes 151 and a signal line X formed along a column of the pixel electrodes 151, and is turned on by a drive voltage from the scanning line Y. Then, a signal voltage is applied to the pixel electrode.

As shown in FIG. 4 in more detail, the array substrate 100 includes a scanning line Y formed along the row of the pixel electrodes 151 and a signal line X formed along the column of the pixel electrodes 151. And a pixel TFT 121 disposed near the intersection of the scanning line Y and the signal line X corresponding to the pixel electrode 151.

Further, the array substrate 100 includes a liquid crystal capacitor C
A storage capacitor electrode 61 having the same potential as the pixel electrode 151 disposed opposite to the pixel electrode 151 via the gate insulating film 62 to form a storage capacitor CS electrically parallel to L, and a storage capacitor line 52 set to a predetermined potential And

The signal line X is disposed so as to be substantially orthogonal to the scanning line Y and the auxiliary capacitance line 52 via the interlayer insulating film 76. The auxiliary capacitance line 52 is formed of the same material in the same layer as the scanning line Y, and is formed substantially parallel to the scanning line Y. A part of the auxiliary capacitance line 52 is arranged to face the auxiliary capacitance electrode 61 via the gate insulating film 62. This auxiliary capacitance electrode 61 is formed of an impurity-doped polysilicon film.

The wiring portions such as the signal lines X, the scanning lines Y, and the auxiliary capacitance lines 52 are formed of a light-shielding low-resistance material such as aluminum or molybdenum-tungsten. In this embodiment, the scanning lines Y and the auxiliary capacitance lines 52 are formed of molybdenum-tungsten, and the signal lines X are mainly formed of aluminum.

The pixel TFT 121 has a semiconductor layer 11 formed of the same polysilicon film as the auxiliary capacitance electrode 61.
Two. The semiconductor layer 112 is formed on the glass substrate 1
The drain region 112 is formed on the undercoating layer 60 disposed on the first region 1 by doping impurities on both sides of the channel region 112C.
D and a source region 112S. This pixel TF
T121 corresponds to the semiconductor layer 112 via the gate insulating film 62.
Gate electrode 63 integrated with scanning line Y disposed opposite to
It has.

The drain electrode 88 of the pixel TFT 121 is
It is formed integrally with the signal line X, and is formed by being electrically connected to the drain region 112D of the semiconductor layer 112 through a contact hole 77 penetrating the gate insulating film 62 and the interlayer insulating film 76. The source electrode 89 of the pixel TFT 121 includes the gate insulating film 62 and the interlayer insulating film 7.
6 through a contact hole 78 penetrating through the semiconductor layer 1.
It is formed by being electrically connected to the twelve source regions 112S.

On the interlayer insulating film 76 of the array substrate 100, red (R), green (G), blue (B)
Color filter layers 24 (R, G,
B) is provided. Then, the color filter layer 24
A pixel electrode 151 is provided above. Pixel electrode 1
Reference numeral 51 is electrically connected to the source electrode 89 of the pixel TFT 121 via the through hole 26.

The auxiliary capacitance electrode 61 is electrically connected to a contact electrode 80 formed of the same material as the signal line X via a contact hole 79 penetrating the gate insulating film 62 and the interlayer insulating film 76. Pixel electrode 151
Are electrically connected to a contact electrode 80 via a contact hole 81 penetrating the color filter layer 24. Thereby, the source electrode 8 of the pixel TFT 121 is
9, the pixel electrode 30, and the auxiliary capacitance electrode 61 have the same potential.

The column spacer 31 is formed of black or transparent resin. For example, the columnar spacer 31
Is formed of a photosensitive carbonless black resin containing a pigment. This columnar spacer 31 has a size of about 5 μm.
m. This columnar spacer 31
In the display region 40, each color filter laminated on a light-shielding wiring portion (for example, a scanning line or an auxiliary capacitance line formed of a molybdenum-tungsten alloy film, a signal line formed of aluminum, or the like). Layer 24 (R,
G, B).

The alignment film 13 A aligns liquid crystal molecules contained in the liquid crystal composition 300 in a direction substantially perpendicular to the array substrate 100.

The counter substrate 120 has a counter electrode 22 formed on a transparent insulating substrate 21 such as a glass substrate, and an alignment film 13B covering the counter electrode 22.

The counter electrode 22 is formed of a light-transmissive conductive member such as ITO which is arranged to face the entire pixel electrode 151 on the array substrate 110 side. Alignment film 13
B aligns the liquid crystal molecules contained in the liquid crystal composition 300 in a direction substantially perpendicular to the counter substrate 200.

Array substrate 1 in liquid crystal display panel 10
A polarizing plate PL1 is provided on the surface of the counter substrate 200, and a polarizing plate PL2 is provided on the surface of the counter substrate 200.

Meanwhile, the pixel electrode 151 formed on the array substrate 100 and the opposing substrate 2
The interval between the counter electrode 204 formed at 00 and the peripheral end 151P of the pixel electrode 151 is different from the other end, for example, the center 151C of the pixel electrode 151.

That is, a part of the pixel electrode 151 is disposed on the projection 140 formed in a convex shape by using an insulating material. In the first embodiment shown in FIGS. 3 and 4, the protrusion 140 is formed of an insulating material such as a black resin, and the color filter layer (insulating film) 24 (R, G,
B) and the pixel electrode 151.

The protrusion 140 is arranged, for example, substantially parallel to the signal line Y and at the boundary between adjacent pixels as shown in FIG. 2, and has a substantially triangular cross section as shown in FIG. It is formed as follows. Thereby, the pixel electrode 1
The distance between the pixel electrode 51 and the counter electrode 204 is set at a portion other than the peripheral end portion 151P of the pixel electrode 151 (the pixel electrode central portion 1P).
51C).

As shown in FIGS. 2 and 3, the pixel electrode 151 has a cutout 145 in which a part is cut out in the pixel. In this embodiment, the cutout portion 145 is formed substantially at the center of the pixel.

As described above, only on the array substrate 100 side,
By providing the protrusion 140 and the notch 145, as shown in FIGS. 2 and 3, a plurality of different domains, that is, the first domain DM1 and the second domain D
M2 can be formed. The height of the protrusion 140 is preferably 1 μm or more in order to achieve a multi-domain structure. Thus, the viewing angle can be increased, and the display performance can be improved.

Further, as compared with a structure in which a notch or a projection is provided on both of a pair of substrates, a margin of bonding accuracy of the two substrates can be expanded, and a manufacturing yield can be improved. Becomes Further, problems such as generation of display unevenness, reduction in transmittance, and reduction in aperture ratio can be solved, and display quality can be improved.

Next, a method of manufacturing the above-described liquid crystal display panel 10 will be described.

In the manufacturing process of the array substrate 100, first,
On the glass substrate 11 having a thickness of 0.7 mm, a silicon nitride film and a silicon oxide film are successively formed by the CVD method to form the undercoating layer 60 having a two-layer structure.

Subsequently, an amorphous silicon film is formed on the undercoating layer 60 by a CVD method or the like. Then, the amorphous silicon film is irradiated with an excimer laser beam and is annealed to be polycrystallized. Thereafter, the polycrystallized silicon film, that is, the polysilicon film 112 is patterned by a photolithography process to form the semiconductor layer of the TFT 121 and the auxiliary capacitance electrode 61.

Subsequently, a gate insulating film 62 is formed by forming a silicon oxide film on the entire surface by the CVD method. Subsequently, tantalum (Ta), chromium (Cr), aluminum (Al), molybdenum (Mo), tungsten (W),
A simple substance such as copper (Cu), a laminated film thereof, or an alloy film thereof (in this embodiment, Mo-W
Alloy film), and is patterned into a predetermined shape by a photolithography process. Accordingly, the scanning line Y, the auxiliary capacitance line 52, and the gate electrode 63 integrated with the scanning line Y
And various wirings are formed.

Subsequently, using the gate electrode 63 as a mask,
Impurities are implanted into the polysilicon film 112 by an ion implantation method or an ion doping method. Thereby, the TFT 12
One drain region 112D and one source region 112S are formed. Then, the impurities are activated by annealing the entire substrate.

Subsequently, a silicon oxide film is formed on the entire surface by the CVD method, and an interlayer insulating film 76 is formed.

Subsequently, by a photolithography process,
Through the gate insulating film 62 and the interlayer insulating film 76, the TFT
The contact hole 77 reaching the drain region 112D of 121 and the contact hole 7 reaching the source region 112S
8 and a contact hole 79 reaching the auxiliary capacitance electrode 61
And form

Subsequently, Ta, Cr, Al, Mo, W, and C are formed on the entire surface of the interlayer insulating film 76 by sputtering.
A single film of u or the like, a laminated film thereof, or an alloy film thereof (in this embodiment, a laminated film of Mo—Al) is formed and patterned into a predetermined shape by a photolithography process. Thus, the signal line X is formed, and the drain electrode 88 of the TFT 121 is formed integrally with the signal line X. At the same time, a contact electrode 80 that contacts the source electrode 89 of the TFT 121 and the auxiliary capacitance electrode 61 is formed.

Subsequently, a photosensitive resist (ultraviolet curable acrylic resin resist) in which a red pigment is dispersed is applied to the entire surface of the substrate by a spinner. And at 90 ° C
After drying for 0 minutes, the resist film is exposed at a wavelength of 365 nm with a light exposure of 200 mJ / cm ² through a photomask that irradiates a portion corresponding to a red pixel with light. Then, the resist film is developed with a 1 wt% aqueous solution of KOH for 20 seconds, and further washed with water.
Bake for 0 minutes. Thus, a red color filter layer 24R is formed.

Subsequently, by repeating the same steps, a green color filter layer 24G made of an ultraviolet-curable acrylic resin resist in which a green pigment is dispersed and an ultraviolet-curable acrylic resin resist in which a blue pigment is dispersed are formed. The blue color filter layer 24B is formed.

In the process of forming the color filter layer 24, a through hole 26 for contacting the switching element 121 with the pixel electrode 151 is formed at the same time. Further, a contact hole 81 for contacting the pixel electrode 151 and the contact electrode 80 is also formed at the same time.

Subsequently, as shown in FIG. 5A, a black photosensitive resist (ultraviolet curable acrylic resin resist) 140 'is applied to the entire surface of the substrate by a spinner, and then dried at 90 ° C. for 10 minutes. . And (b) of FIG.
As shown in FIG. 19, this resist film 140 'is formed on a photomask such that light is applied to a portion corresponding to an inter-pixel portion in the display region and a portion corresponding to a light shielding region around the display region.
Exposure is performed at an exposure amount of 300 mJ / cm ² at a wavelength of m. Then, as shown in FIG.
After developing 0 ′ with an alkaline aqueous solution having a pH of 11.5, it is further washed with water. Then, as shown in FIG. 5D, the remaining black resist film 140 ′ is
And melt by baking for 60 minutes.
Thus, the protrusion 140 is formed of the black resin.

Subsequently, an ITO film is formed on the color filter layer 24 by a sputtering method, and is patterned into a predetermined pixel pattern by a photolithography process, thereby forming a pixel electrode 151 in contact with the switching element 121. At the time of this patterning, a notch 145 is formed in a part of the pixel electrode 151.

Subsequently, a photosensitive acrylic transparent resin material is applied on the surface of the substrate to a thickness of about 5 μm by a spinner. After the resin material is dried at 90 ° C. for 10 minutes, it is exposed at a wavelength of 365 nm using a photomask having a predetermined pattern at an exposure amount of 100 mJ / cm ² . Then, the resin material is developed with an aqueous alkaline solution having a pH of 11.5 and baked at 200 ° C. for 60 minutes. Thereby, the columnar spacer 31 having a height of about 4.5 μm is formed.

Subsequently, a vertical alignment film material such as polyimide is applied to the entire surface of the substrate and baked to form an alignment film 13A.

Thus, the array substrate 100 is manufactured.

On the other hand, in the manufacturing process of the opposing substrate 200, first, an ITO film is formed on a glass substrate 21 having a thickness of 0.7 mm by a sputtering method, and the opposing electrode 22 is formed by patterning. And the counter electrode 2
Then, a vertical alignment film material such as polyimide is applied to the entire surface of the transparent substrate 21 so as to cover the transparent substrate 2 and baked to form an alignment film 13B.

Thus, the opposing substrate 200 is manufactured.

In the manufacturing process of the liquid crystal display panel 10, an outer edge seal member 106, which is a thermosetting epoxy adhesive, is printed and applied along the outer edge of the array substrate 100 so as to surround the liquid crystal accommodating space except for the liquid crystal injection port 32. Further, an electrode transfer material for applying a voltage from the array substrate 100 to the counter electrode 200 is formed on the electrode transfer electrode around the outer edge seal member 106. Subsequently, the alignment film 13 of the array substrate 100
A and the array substrate 100 and the counter substrate 200 are arranged so that A and the alignment film 13B of the counter substrate 200 face each other;
The outer edge seal member 106 is cured by heating, and the two substrates are bonded together. The outer edge sealing member 106 is, for example, a thermosetting epoxy adhesive.

Subsequently, a liquid crystal composition 300 having a negative dielectric anisotropy is injected from a liquid crystal injection port 32, and the liquid crystal injection port 32 is sealed with an injection port sealing member 33 which is an ultraviolet curable epoxy adhesive. I do.

Subsequently, the array substrate 100 and the opposing substrate 2
A polarizing plate is stuck on the outer surface of 00 to make a module.

A liquid crystal display panel is manufactured by the above manufacturing method.

The color liquid crystal display device of the multi-domain VAN type alignment mode manufactured as described above was able to display a high-quality image without display unevenness or roughness.

Next, a second embodiment of the present invention will be described.

In the liquid crystal display device according to the second embodiment, the basic structure is substantially the same as that of the first embodiment, but the array substrate has a schematic sectional structure shown in FIG. As described above, the insulating substrate 11 and the color filter layer (insulating film) 2
4 (R, G, B).

The protrusion 140 is formed of an insulating material such as a black resin, and the color filter layer 24 (R,
G, B) are formed before the formation process. This projection 140
Are formed, for example, substantially parallel to the signal line Y and at the boundary between adjacent pixels, and have a substantially triangular cross section as shown in FIG. As a result, the distance between the pixel electrode 151 and the counter electrode is larger than the peripheral end portion 151P of the pixel electrode 151 (the central portion of the pixel electrode 151).
51C).

As shown in FIG. 6, the pixel electrode 151
Is a cutout portion 14 in which a part is cut out in a pixel.
Five. In this embodiment, the notch 145
Are formed substantially in the center of the pixel.

As described above, only on the array substrate 100 side,
By providing the projection 140 and the cutout 145, a plurality of different domains can be formed in the same pixel. Thus, the viewing angle can be increased, and the display performance can be improved.

Further, as compared with a structure in which a notch or a projection is provided on both of a pair of substrates, a margin of bonding accuracy of the two substrates can be expanded, and a manufacturing yield can be improved. Becomes Further, problems such as generation of display unevenness, reduction in transmittance, and reduction in aperture ratio can be solved, and display quality can be improved.

When a liquid crystal display device having the structure shown in FIG. 6 was manufactured and assembled into a liquid crystal module and driven, it was possible to display a high quality image without display unevenness or roughness.

In the first and second embodiments described above, the projection 140 is formed of black resin.
There is no particular limitation as long as the material has an insulating property and the color is arranged so as to be hidden by the wiring portion on the array substrate.

In the first and second embodiments described above, the protrusion 140 is arranged substantially parallel to the signal line Y. However, the present invention is not limited to this, and the protrusion 140 is arranged substantially parallel to the scanning line X. Alternatively, they may be arranged along other directions.

Next, a third embodiment of the present invention will be described.

The basic structure of the liquid crystal display device according to the third embodiment is substantially the same as that of the first embodiment, but the array substrate has a schematic sectional structure shown in FIG. As described above, the color filter layer 24 (R,
G, B).

That is, the projection 140 is formed by a plurality of color filter layers 24 corresponding to pixels adjacent to each other.
It is formed by laminating (R, G, B). That is, the protrusion 140 is formed in the color filter layer 2
4 (R, G, B). Thereby, the manufacturing process for forming the protrusion 140 can be omitted, and the manufacturing cost can be reduced.

The projection 140 is arranged, for example, substantially in parallel with the signal line Y and at the boundary between adjacent pixels, and has a substantially triangular cross section as shown in FIG. As a result, the distance between the pixel electrode 151 and the counter electrode is wider in the other portion (the pixel electrode central portion 151C and the like) than in the peripheral end portion 151P of the pixel electrode 151.

As shown in FIG. 7, the pixel electrode 151
Is a cutout portion 14 in which a part is cut out in a pixel.
Five. In this embodiment, the notch 145
Are formed substantially in the center of the pixel.

As described above, only on the array substrate 100 side,
By providing the projection 140 and the cutout 145, a plurality of different domains can be formed in the same pixel. Thus, the viewing angle can be increased, and the display performance can be improved.

Further, as compared with a structure in which a notch or a protrusion is provided on both of a pair of substrates, a margin of bonding accuracy of the two substrates can be expanded, and a manufacturing yield can be improved. Becomes Further, problems such as generation of display unevenness, reduction in transmittance, and reduction in aperture ratio can be solved, and display quality can be improved.

When a liquid crystal display device having the structure shown in FIG. 7 was manufactured and assembled into a liquid crystal module and driven, it was possible to display a high quality image without display unevenness or roughness.

Next, a fourth embodiment of the present invention will be described.

The basic structure of the liquid crystal display device according to the fourth embodiment is substantially the same as that of the third embodiment, but FIG. 8 shows a schematic sectional structure of the array substrate. As described above, the color filter layer 24 (R,
G, B).

That is, the projections 140 are formed of a plurality of color filter layers 24 corresponding to pixels that are not adjacent to each other.
Since it is formed by laminating (R, G, B), a manufacturing process for forming the projection 140 can be omitted, and manufacturing cost can be reduced.

The protrusion 140 is arranged, for example, substantially parallel to the signal line Y and at the boundary between adjacent pixels, and has a substantially triangular cross section as shown in FIG. As a result, the distance between the pixel electrode 151 and the counter electrode is wider in the other portion (the pixel electrode central portion 151C and the like) than in the peripheral end portion 151P of the pixel electrode 151.

As shown in FIG. 8, the pixel electrode 151
Is a cutout portion 14 in which a part is cut out in a pixel.
Five. In this embodiment, the notch 145
Are formed substantially in the center of the pixel.

As described above, only on the array substrate 100 side,
By providing the projection 140 and the cutout 145, a plurality of different domains can be formed in the same pixel. Thus, the viewing angle can be increased, and the display performance can be improved.

Further, as compared with a structure in which a notch or a projection is provided on both of a pair of substrates, a margin of bonding accuracy of the two substrates can be expanded, and a manufacturing yield can be improved. Becomes Further, problems such as generation of display unevenness, reduction in transmittance, and reduction in aperture ratio can be solved, and display quality can be improved.

A liquid crystal display device having the structure shown in FIG. 8 was manufactured, assembled into a liquid crystal module, and driven. As a result, an image having high image quality could be displayed without display unevenness or roughness.

In the third and fourth embodiments described above, the projection 140 is formed by the color filter layer. However, any material having an insulating property may be used. There is no particular limitation because it is arranged to hide.

In the third and fourth embodiments described above, the projection 140 is arranged substantially parallel to the signal line Y. However, the present invention is not limited to this, and the projection 140 may be arranged substantially parallel to the scanning line X. Alternatively, they may be arranged along other directions.

As described above, according to the present invention, a multi-domain VAN having a plurality of different domains within the same pixel can be provided by providing alignment control means such as a protrusion and a notch only on one substrate side. It is possible to provide a color liquid crystal display device of the type alignment mode. Also,
According to the present invention, the viewing angle can be increased and the display performance can be improved.

Further, according to the present invention, it is possible to extend the margin of bonding accuracy of the two substrates, and to improve the production yield. Further, problems such as generation of display unevenness, reduction in transmittance, and reduction in aperture ratio can be solved, and display quality can be improved.

[0094]

As described above, according to the present invention, it is possible to improve the manufacturing yield by extending the margin of the bonding accuracy of a pair of substrates, and to improve the display quality. Can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a structure of a liquid crystal display panel applied to a liquid crystal display device of the present invention.

FIG. 2 is a plan view schematically showing a structure of an array substrate of the liquid crystal display panel shown in FIG.

FIG. 3 is a sectional view schematically showing a structure of a liquid crystal display device according to the embodiment of the present invention.

FIG. 4 is a sectional view schematically showing a structure of an array substrate constituting the liquid crystal display device shown in FIG.

FIGS. 5A to 5D are views for explaining a manufacturing process for forming a protrusion;

FIG. 6 is a sectional view schematically showing a structure of an array substrate applied to a liquid crystal display device according to a second embodiment of the present invention.

FIG. 7 is a sectional view schematically showing a structure of an array substrate applied to a liquid crystal display device according to a third embodiment of the present invention.

FIG. 8 is a sectional view schematically showing a structure of an array substrate applied to a liquid crystal display device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display panel 24 (R, G, B) ... Color filter layer 31 ... Columnar spacer 100 ... Array board 102 ... Display area 104 ... Peripheral area 106 ... Outer edge sealing member 121 ... Switching element 140 ... Projection part 145 ... Notch 151: pixel electrode 200: counter substrate 204: counter electrode 300: liquid crystal composition SP: light shielding layer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shoichi Kurauchi 1-9-9, Hara-cho, Fukaya-shi, Saitama Pref. Inside the Toshiba Fukaya Plant (72) Inventor Kazuyuki Sunahara 1-9-9 Hara-cho, Fukaya-shi, Saitama Prefecture Inside the Company F term in the Toshiba Fukaya factory (reference) 2H088 FA01 FA16 HA02 HA08 JA10 2H092 GA13 GA16 GA17 NA27 NA29 NA30 PA05 PA06 PA08

Claims (5)

[Claims] An array substrate having a plurality of switching elements formed on the substrate, and a plurality of pixel electrodes respectively connected to the plurality of switching elements; A liquid crystal display device comprising: a counter substrate having a counter electrode facing the pixel electrode; and a liquid crystal composition having a negative dielectric anisotropy disposed in a gap between the array substrate and the counter substrate. At least a part of the end portion of each of the pixel electrodes has a smaller interval with the counter electrode than other regions, and
The liquid crystal display device, wherein the pixel electrode has a notch therein. 2. The liquid crystal display device according to claim 1, wherein an end of said pixel electrode is disposed on a projection formed in a convex shape by an insulating material. 3. The liquid crystal display according to claim 2, wherein a color filter layer is formed on the plurality of switching elements, and the projections are formed by laminating the color filter layers. apparatus. 4. An array substrate, comprising: a plurality of scanning lines formed in a row direction; and a plurality of signal lines formed in a column direction. 2. The liquid crystal display device according to claim 1, wherein at least a part of an end in a direction along the line has a smaller distance from the counter electrode than other regions. 3. 5. The notch portion is formed in a region adjacent to the pixel electrode.
5. The liquid crystal display device according to claim 4, wherein the liquid crystal display device is disposed substantially at the center between the signal lines and substantially parallel to the signal lines.