JPH1184386A - Active matrix type liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the orientation defect of display images by forming columnar spacers on one of two sheets of substrates to make the spacing between both substrates uniform and covering regions rendering the orientation defects by light shielding members. SOLUTION: An active matrix substrate 10 is arranged with scanning lines and signal lines orthogonal therewith in a grid form on a glass substrate 11. Pixel electrodes 13 are arranged to overlap on the scanning lines of the stage before one line via insulating film to provide storage capacitors. The storage capacitor electrodes forming the storage capacitor are extended in parallel with a rubbing direction at the time of the rubbing orientation treatment of a counter substrate 30 when the glass substrate is combined with a second substrate, i.e., the counter substrate 30, and in the direction where the fibers of the rubbing cloth of the columnar spacers formed on the counter substrate 30 are wiped away. The columnar spacers are further formed to the shape overhanging on the scanning lines or part of the scanning lines to the display electrode side and are formed in the positions near the scanning electrodes of the storage capacitor electrodes where the spacers come into contact with the active matrix substrate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a structure for reducing alignment defects caused by a gap agent for maintaining a constant gap between two substrates constituting a liquid crystal display device.

[0002]

2. Description of the Related Art A commonly used liquid crystal display device is:
Two insulating substrates having electrodes are opposed to each other, the periphery of the two substrates is fixed with an adhesive except for a liquid crystal injection port, and liquid crystal is sandwiched between the two substrates, and the liquid crystal injection port is sealed. It is configured to be sealed with a stopper.

[0003] These substrates are opposed to each other with a predetermined gap, that is, a cell gap. As a gap material (hereinafter, referred to as a spacer) for keeping the cell gap uniform,
It is customary to scatter plastic beads or the like having a uniform particle size.

However, it is known that the alignment of the liquid crystal is likely to be disturbed around the spacer, and as a result, light leaks to lower the contrast. Further, in a high-definition liquid crystal display device, the ratio of the region in which the above-mentioned alignment disturbance occurs to the display pixel electrode increases, so that the above-described decrease in contrast becomes more remarkable.

On the other hand, in a liquid crystal display device having a large screen, it is very difficult to uniformly disperse spacers over the entire screen.
Color unevenness or interference fringes are likely to occur.

For this reason, a plurality of colored layers of a color filter are laminated without using plastic beads or the like, or a photosensitive resin is used to form at least one of two substrates constituting a liquid crystal display device. A liquid crystal display device in which a columnar spacer is formed on one main surface has been proposed.

FIG. 7 is a schematic view showing an example of a conventionally used active matrix type liquid crystal display device. As shown in FIG. 7, the liquid crystal display device 1001
TFT (Thin FilmTr) using amorphous silicon (a-Si) as a switching element as a semiconductor layer
transistor 1011, the pixel electrode 1013 connected to the source electrode 1012 of the TFT 1011, the signal line 1015 connected to the drain electrode 1014, the TFT 10
Scan line 1 connected to 11 gate electrodes (not described in detail)
Active matrix substrate 101 on which 016 is formed
0, an active matrix substrate 1010, a counter substrate 1020 having a counter electrode and a color filter, and a liquid crystal 1030 sandwiched between the two substrates.

Active matrix type liquid crystal display device 10
In 10, the following control is generally used as a method of displaying an image. First, signal line 1
015 and a scanning line 1016
Then, by sequentially applying a selection pulse for each row from above the display screen, the video signal applied to the signal line 1015 is written to the selected pixel electrode 1013. That is,
Since the light transmittance of the liquid crystal changes according to the potential difference between the pixel electrode 1013 and the counter electrode, the amount of light transmitted from the back surface of the active matrix substrate 1010 changes to display an image.

[0009]

By the way, in the above-mentioned step of bonding two glasses of the liquid crystal display device,
When the spacing between the substrates is maintained by dispersing plastic beads or the like having a uniform particle size as spacers, there is a problem that the contrast is lowered and the cell gap is not uniform.

On the other hand, a plurality of colored layers of a color filter are laminated without using plastic beads or the like, or a columnar spacer is formed on at least one of two substrates constituting a liquid crystal display device using a photosensitive resin or the like. As described with reference to FIG. 8, in the method of forming the rubbing cloth 1041 at the side 1051 where the rubbing cloth 1041 separates from the columnar spacer during the alignment treatment by rubbing, the fiber of the rubbing cloth 1041 is formed due to the height of the columnar spacer 1050. Is the columnar spacer 1050
The base 1052, that is, the columnar spacer 1050 cannot reach the portion rising from the substrate, and a region where the rubbing process is incomplete occurs. In a region where the alignment processing is incomplete, the alignment is likely to be disordered, which often results in display failure.

An object of the present invention is to provide a liquid crystal device capable of preventing display defects in display colors by reducing alignment defects caused by a gap agent for maintaining a constant gap between two substrates constituting a liquid crystal display device. A display device is provided.

[0012]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned problems, and has a plurality of scanning lines and a plurality of signal lines arranged so as to intersect each other on one main surface;
A thin film transistor formed at each intersection of the scanning line and the signal line, connected to the scanning line and the signal line, a pixel electrode connected to each of the thin film transistors, and a part of the scanning line is extended to the display electrode side. An active matrix substrate in which a storage capacitor electrode and a wiring are formed to form a storage capacitor and form a storage capacitor, a counter electrode on one main surface, a color filter including a coloring layer, and a columnar projection for providing a desired gap And an opposing substrate having an inter-substrate gap material. After forming an alignment film on one main surface of each of the substrates, each of the alignment films is subjected to an alignment treatment by rubbing, and the active matrix substrate and the counter substrate are formed. In an active matrix type liquid crystal display device in which the main surfaces of the substrates are opposed to each other and a liquid crystal composition is sandwiched between them, a storage capacitor forming a storage capacitor When the liquid crystal display device is formed by combining the two substrates, the amount electrode is parallel to the rubbing direction at the time of the rubbing alignment treatment of the counter substrate, and the direction in which the rubbing member used for rubbing is moved. The inter-substrate gap material is formed to extend in the wake side direction, and the inter-substrate gap material has a shape in which a scanning line or a part of the scanning line protrudes toward the display electrode side, and scans a storage capacitor electrode forming a storage capacitor. An active matrix type liquid crystal display device characterized by being connected to an active matrix substrate near an electrode.

Further, the present invention is formed for each of a plurality of scanning lines and a plurality of signal lines arranged so as to intersect each other on one main surface, and for each intersection of the scanning lines and the signal lines. And a thin film transistor connected to the signal line, a pixel electrode connected to each thin film transistor, a storage capacitor electrode and a wiring forming a shape in which a part of the scanning line is protruded to the display electrode side to form a storage capacitor, A colored layer, an active matrix substrate in which an inter-substrate gap material including a columnar projection having a predetermined height provided to provide a desired gap, and a counter substrate having a counter electrode on one main surface are provided. Forming an alignment film on one main surface of each of the substrates, performing an alignment process by rubbing, and then opposing the main surfaces of the active matrix substrate and the counter substrate to each other; In an active matrix type liquid crystal display device in which a liquid crystal composition is sandwiched between them, a storage capacitor electrode forming a storage capacitor is parallel to a rubbing direction at the time of rubbing alignment treatment of the active matrix substrate, and is used more than rubbing. A storage capacitor is formed along the direction in which the processing member to be moved is moved, and the inter-substrate gap material has a shape in which a scanning line or a part of the scanning line is protruded to the display electrode side to form a storage capacitor. An active matrix liquid crystal display device is formed on the scanning electrode side of the electrode.

Furthermore, the present invention provides a photosensitive material in which the inter-substrate spacing material forming the columnar projections is one of three primary colors of light for performing color display: red, blue, and green. Is formed by a single layer or a laminated layer of a black photosensitive material for providing the above, or another white or transparent photosensitive material.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic plan view showing a state where one pixel of a three-segment structure of a liquid crystal display device of the present invention is viewed from a plane.

As shown in FIG. 1, an active matrix type liquid crystal display device 1 has, as shown in FIG. 2, a first liquid crystal display device 1 made of an insulating transparent material such as glass.
And a second substrate 30 which is opposed to the first substrate 10 at a predetermined interval and which is made of an insulating transparent material such as glass similarly to the first substrate 10. It consists of a liquid crystal material 50 injected between them.

In the first substrate, that is, the active matrix substrate 10, a scanning line 14 and a signal line 15 orthogonal thereto are arranged on a glass substrate 11 in a grid pattern. The TFT 12 is formed near the intersection of the scanning line 14 and the signal line 15, and the source electrode 18 of the TFT 12 is connected to the pixel electrode 13.
And the drain electrode 19 is formed integrally with the signal line 15 for supplying a video signal to the drain electrode 19.

The pixel electrode 13 is arranged so as to overlap the scanning line 14 of the previous row via an insulating film, and provides a storage capacitor. The storage capacitor electrode 16 that forms the storage capacitor is the second storage capacitor electrode.
Rubbing direction (Rc) at the time of rubbing orientation treatment of the counter substrate 30 when combined with the substrate of FIG.
And the columnar spacer 3 formed on the opposing substrate 30
The rubbing cloth of No. 7 is extended in a direction in which the fibers are removed.

The columnar spacer 37 is further provided with a scanning line 14.
The upper portion or a part of the scanning line 14 is formed to protrude toward the display electrode side, and the storage capacitor electrode 16 is brought into contact with the active matrix substrate 10 near the scanning electrode 14 (the scanning line 14 in the example shown in FIG. 1). Above).

Next, a process of manufacturing the liquid crystal device 1 shown in FIG. 1 will be described in detail with reference to FIGS. FIG. 2 is a partial cross-sectional view of one pixel of the liquid crystal display device shown in FIG. 1 taken along line AA ′ (TFT 12) in FIG.
FIG. 3 shows one pixel of the liquid crystal display device taken along line BB ′ in FIG.
It is the fragmentary sectional view cut along (columnar spacer 37).

As shown in FIG. 2, the glass substrate 11 of the active matrix substrate (first substrate) 10 has M
After the ow (molybdenum / tansten) alloy is deposited, the scanning line 14 and the gate electrode 17 which is a part of the scanning line are formed by etching by photolithography.

Next, for example, S
An insulating film such as iOx (silicon oxide) is
The gate insulating film 20 is formed on the scanning line 14 and the gate electrode 17 at m.

Further, a semiconductor layer 21 made of a-Si (amorphous silicon) having a thickness of, for example, 50 nm and a protective insulating film 22 made of SiNx (silicon nitride) are formed on the gate electrode 17 by a plasma CVD method.

Next, a low resistance material such as a-Si doped with P (phosphorus) is formed above the protective insulating film 22 and the semiconductor layer 21 so as to cover the entire semiconductor layer 21 and a part of the protective insulating film 22. A semiconductor layer 24 is provided.

Hereinafter, ITO (a thin layer of indium oxide), which is a transparent conductive film, is deposited as a pixel electrode 13 by a sputtering method, and is subsequently processed into a predetermined pattern by patterning. Here, the pixel electrode 13 is connected to the former stage (1).
The storage capacitor 16 is formed so as to partially overlap the scanning line (before the row), and the gate insulating film 20 forms the storage capacitor 16.

Further, the source electrode 18, the signal line 15, and the drain electrode 19 continuous with the signal line 15 are
1 (aluminum) is deposited and then removed by etching using a photoresist as a mask, thereby forming the low-resistance semiconductor layer 24. Thus, one end of the source electrode 18 is connected so as to cover a part of the pixel electrode 13.

Next, an insulating film 27 serving as a TFT protective film made of, for example, SiNx having a thickness of 200 nm is formed on the entire surface by plasma CVD to form an active matrix substrate 20.

Separately, a BM (black matrix) 32 having a predetermined shape is formed of a light-shielding material on a transparent glass substrate 31 as a counter substrate 30. Next, a photoresist layer in which a pigment is dispersed is applied, pattern-exposed, and developed to form a colored layer 33. This process is repeated to form three color regions of blue, green, and red in a stripe shape, and at the same time, arrange and stack the colored layers 33 ′ and 33 ″ at predetermined positions, thereby stacking the columnar spacer 37.
To form Note that, as shown in FIG. 1, the position where the spacer 17 is formed coincides with the storage capacitor electrode 16 forming the storage capacitor when combined with the active matrix substrate 10 shown in FIG.

Further, a counter electrode 35 made of ITO is formed on the gold surface by a sputtering method to form a counter substrate 30.
Next, a low-temperature cure type polyimide film is formed on the entire display region except for the region in contact with the periphery of the columnar spacer 37 on each of the pixel electrode 13 side of the active matrix substrate 10 and the counter electrode 35 side of the counter substrate 30. Alignment film 2
8, 38 are formed. Subsequently, the rubbing process is performed on both the alignment films 28 and 38 so that the alignment axes are 90 ° when the substrates 10 and 30 are arranged to face each other.

Thereafter, the two substrates 28 and 38 are assembled so as to face each other, and a nematic liquid crystal material 50 is injected into the gap between the substrates and sealed. Next, a polarizing plate (not shown) is attached to both sides of the cell.

As described above, the active matrix type liquid crystal display device 1 is provided. When the liquid crystal display device thus formed was mounted and driven with a predetermined driving circuit (driver IC), no cell gap unevenness, color unevenness, interference fringes, etc. were observed. A phenomenon in which the orientation of the liquid crystal was not disturbed in a region where the Rabink treatment was not performed due to the cloth fibers being wiped by the columnar spacers was not observed, and a favorable display state was obtained.

In the above-described embodiment, the columnar spacer is formed only in the pixel corresponding to one of the three color pixels of the liquid crystal display device. However, depending on the bonding condition between the active matrix substrate and the counter substrate, the column spacer may be formed. , Columnar spacer, 2
It may be formed in a pixel corresponding to a color or all colors. Also,
When a columnar spacer is formed only in a pixel corresponding to one color, it is necessary to form a storage capacitor electrode so that a pixel having a columnar spacer and a pixel not forming the columnar spacer have the same storage capacitance.

FIG. 4 is a schematic sectional view showing another configuration usable for the counter substrate 30 in the first embodiment shown in FIGS. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG.
Has a black matrix 32 formed of a light-shielding material on a glass substrate 31. Next, a photoresist layer is applied, pattern-exposed, and developed to form a colored layer 33. This process is repeated to form three color regions of blue, green and red in a stripe shape.

Subsequently, a photosensitive acrylic resin is applied on the colored layer 33, and is subjected to pattern exposure and then developed to form a columnar spacer 137. The position where the columnar spacer 137 is formed is, as shown in FIG.
Are matched with the storage capacitor electrode 16 forming the storage capacitor when combined with the active matrix substrate 10.

Further, a counter electrode 35 made of ITO is formed on the entire surface by a sputtering method, and a counter substrate 130 is obtained. Hereinafter, the liquid crystal display device 101 is obtained by assembling the opposing substrate 130 on the active matrix substrate 10 so that the position of the columnar spacer 137 constitutes the storage capacitor electrode 16 described above.

The liquid crystal display device 10 thus formed
1, when driving by mounting a predetermined driving circuit, unevenness of the cell gap, color unevenness, interference fringes, etc. are not observed, and also, the fibers of the rubbing cloth are removed by the columnar spacers. A phenomenon in which the orientation of the liquid crystal was not disturbed in a region where the Rabink treatment was not performed was not observed, and a favorable display state was obtained.

FIG. 5 is a schematic diagram showing another embodiment different from the active matrix type liquid crystal display device shown in FIGS. 1 to 3 and 4. FIG. 5 is a plan view of a portion corresponding to one pixel.
3 is substantially the same as the liquid crystal display device 1 shown in FIG.
Further, the same components as those shown in FIG. 1 to FIG. 3 or FIG. 4 are denoted by the same reference numerals, and detailed description is omitted.

The active matrix substrate 210 has a scanning line 14 and a signal line 15 orthogonal to the scanning line 14 on a glass substrate 11. The TFT 12 is formed near an intersection between the scanning line 14 and the signal line 15. Also, TFT
212 is connected to the pixel electrode 13 through a small hole 229 provided in the coloring layer 228.

The pixel electrode 13 is formed with one layer with the insulating film 223 interposed therebetween.
It is stacked on the scanning line before the row. This provides storage capacity. The storage capacitor electrode 16 for providing a storage capacitor is formed parallel to the rubbing direction (Ra) during the rubbing orientation treatment of the active matrix substrate 210 and along the direction in which the fibers of the rubbing cloth are removed.

At this time, the columnar spacer 237 has a shape in which a portion of the scanning line 14 or a part of the scanning line 14 is extended to the display electrode side, and the storage capacitor electrode 1 forming a storage capacitor is formed.
6 (the scanning line 14 in the embodiment shown in FIG. 5).
Above).

FIG. 6 is a partial cross-sectional view of the active matrix type liquid crystal display 201 shown in FIG. 5, which is cut across the TFT 212 along the line CC '. As shown in FIG. 6, the active matrix substrate 210 is formed by depositing a Mo—W alloy on a glass substrate 11 and performing etching using a photolithography technique on the scanning line 14 and a gate electrode that is a part of the scanning line. 222
To form

Next, an insulating film (SiOx) having a thickness of, for example, 400 nm is formed on the scanning line 14 and the gate electrode 222 by a plasma CVD method to form a gate insulating film 223. Subsequently, the gate insulating film 223 on the gate electrode 222
A semiconductor layer 224 made of a-si having a thickness of, for example, 50 nm and a protective insulating film 225 made of SiNx are formed thereon by a plasma CVD method.

Above the protective insulating film 225 and the semiconductor layer 224, a low-resistance semiconductor layer 226 such as a-Si doped with P is formed so as to cover the entire semiconductor layer 224 and a part of the protective insulating film 225. Is done.

The source electrode 18, the signal line 15, and the drain electrode 19 connected to the signal line 15 are formed by depositing, for example, Al to a predetermined thickness on the low-resistance semiconductor layer 226, and etching away using a photoresist as a mask. Form.

Here, one end of the source electrode 18 is connected to extend below the pixel electrode 13. Next, after applying a photoresist layer, pattern exposure, and development,
A coloring layer 228 is formed. By repeating these, blue,
The three color regions of green and red are striped and the source electrode 1
On 8, a small hole 229 is formed so that it can be provided. at the same time,
The columnar spacers 217 are formed by stacking the colored layers 228 ′ and 228 ″ at predetermined positions. The spacer 2
As shown in FIG. 5, the position where the storage capacitor 17 is formed has a shape in which the scanning line 14 or a part of the scanning line 14 is extended toward the display electrode side, and the storage capacitor electrode 16 forming the storage capacitor is formed.
(In FIG. 5, on the scanning line 14).

After that, ITO, which is a transparent conductive film, is deposited as a pixel electrode 13 by a sputtering method, and is processed into a predetermined pattern by patterning. The source electrode 1
8 passes through the small hole 229 of the coloring layer 228 and passes through the pixel electrode 13
Electrically connected to

Here, the pixel electrode 13 is disposed so as to partially overlap the scanning line of the previous row and the gate insulating film 22.
3 forms a storage capacitor. Further, an insulating film 227 serving as a TFT protective film made of, for example, SiNx having a thickness of 200 nm is formed on the entire surface by plasma CVD, and the active matrix substrate 210 is obtained.

On the other hand, the counter substrate 230 is such that a counter electrode 35 made of ITO is formed on the entire surface of a transparent glass substrate 31 by a sputtering method. Next, an alignment made of a low-temperature curing type polyimide film is applied to the entire display region except for the region in contact with the periphery of each columnar spacer 217 on the pixel electrode 211 side of the active matrix substrate 210 and the counter electrode 35 side of the counter substrate 230. Membrane 28,
Apply 38. Hereinafter, when the substrates 210 and 230 are opposed to each other, a rubbing process is performed so that the directions of the alignment axes are orthogonal to each other.

Thereafter, the two substrates 210 and 230 are opposed to each other to form an assembled cell, and the nematic liquid crystal 5 is inserted between the cells.
Inject 0 and seal. Further, a polarizing plate (not shown) is attached to both sides of the cell.

As described above, the active matrix type liquid crystal display device 201 is provided. A predetermined driving circuit (driver I) is provided to the liquid crystal display device thus formed.
When driving was carried out with mounting C), no cell gap unevenness, color unevenness, interference fringes, etc. were observed, and the fibers of the rubbing cloth were moved due to the height of the columnar spacers. On the AC side in the direction, a phenomenon in which the alignment of the liquid crystal was not disordered in a region where the Rabink treatment was incomplete without being able to reach the alignment film was not observed, and a favorable display state was obtained.

In the embodiment described above, the columnar spacer is formed only in the pixel corresponding to one of the three color pixels of the liquid crystal display device. However, depending on the conditions for bonding the active matrix substrate and the counter substrate, the columnar spacer may be formed. , Columnar spacer, 2
It may be formed in a pixel corresponding to a color or all colors. Also,
When a columnar spacer is formed only in a pixel corresponding to one color, it is necessary to form a storage capacitor electrode so that a pixel having a columnar spacer and a pixel not forming the columnar spacer have the same storage capacitance.

[Comparative Example 1] As shown in FIG. 7, when the storage capacitor electrode was formed and driven without considering the rubbing direction, no uneven cell gap, no uneven color, no interference fringes, etc. were observed. However, the fibers of the rubbing cloth are emitted by the columnar spacers, and the alignment disorder of the liquid crystal due to the region where the rubbing treatment is not performed in the outgoing direction of the rubbing cloth is reduced by about 2 length.
It occurs in a region of 0 μm and a width of 5 μm, and it has been confirmed that display quality deteriorates.

[Comparative Example 2] As shown in FIG. 7, the storage capacitor electrode was formed without being aware of the rubbing direction, and the columnar spacer was not formed. In the case where the plastic beads having a uniform particle size are scattered in the gap, unevenness of the cell gap, color unevenness, interference fringes, and the like due to uneven scattering of the plastic beads were observed, and the display quality was deteriorated. .

As described above, in the liquid crystal display device of the present invention, a plurality of scanning lines and a plurality of signal lines are arranged on one main surface of a glass substrate so as to intersect each other. A thin film transistor connected to a scanning line and a signal line is disposed at each intersection of the pixel electrode, and a pixel electrode connected to each thin film transistor and a shape in which a part of the scanning line is extended to the display electrode side. A storage capacitor electrode and a wiring for forming a storage capacitor are provided to form an active matrix substrate.

At this time, the shape of the storage capacitor electrode depends on the direction of rubbing in the rubbing step for the substrate on which the columnar spacers are formed. It also relates to the positional relationship with the columnar spacer.

For example, when the columnar spacer is formed on the opposing substrate, when the storage capacitor electrode forming the storage capacitor is composed of two substrates to form a liquid crystal display device, the rubbing during the rubbing alignment treatment of the opposing substrate is performed. The columnar spacer is formed in a direction parallel to the direction and in a direction in which the fibers are removed when the rubbing cloth is moved, that is, toward the downstream side in the moving direction of the moving rubbing cloth. The portion has a shape protruding toward the display electrode, and is formed at a position in contact with the active matrix substrate near the scanning electrode of the storage capacitor electrode forming the storage capacitor.

When the columnar spacers are formed on the active matrix substrate, the storage capacitor electrodes forming the storage capacitors are parallel to the rubbing direction when rubbing the active matrix substrate, and the fibers of the rubbing cloth are moved by the rubbing cloth. It is formed in the direction of fluttering on the downstream side at the time of
Further, the inter-substrate gap material is formed near the scanning electrode of the storage capacitor electrode that forms a shape in which a scanning line or a part of the scanning line is protruded toward the display electrode and forms a storage capacitor.

In this way, an alignment film is formed on one main surface of each of the active matrix substrate and the opposing substrate, and an alignment process is performed by rubbing. By sandwiching the liquid crystal composition between them and forming an active matrix type liquid crystal display device, the columnar spacers displace the fibers of the rubbing cloth, and the columnar position is located downstream of the direction in which the rubbing cloth is moved. Even if a misalignment region occurs because the alignment film at the base of the spacer is not rubbed, the misalignment region is formed by a storage capacitor electrode having a shape in which a scanning line or a part of the scanning line protrudes to the display electrode side. Since it contributes as a light-shielding portion, no defective orientation is provided as a display.

In other words, the light-shielding portion is formed of a storage capacitor electrode forming a storage capacitor, and has a shape parallel to the direction of the rubbing of the substrate on which the column spacer is formed, and the height of the column spacer during the rubbing alignment treatment. As the fibers of the rubbing cloth are removed due to the above, the rubbing cloth is formed so as to cover the area where the rubbing is incomplete at the base of the columnar spacer downstream of the direction in which the rubbing cloth moves, thereby increasing the number of steps. Thus, a liquid crystal display element with good display over a large screen can be obtained easily and without lowering the aperture ratio (the ratio of a region through which light can be transmitted to the area per pixel).

[0061]

As described above, in the liquid crystal display device of the present invention, a columnar spacer is formed on at least one of the two substrates constituting the liquid crystal display device to make the gap between the two substrates uniform. In addition, by covering the region in which the spacer causes the alignment failure with respect to the rubbing treatment with the light shielding member, it is possible to prevent the display image from having the alignment failure.

Further, since a gap material that may cause cell gap unevenness, display color unevenness, interference fringes, or the like between the two substrates is not used, a variation in display color of a display image can be reduced. . In addition, the columnar spacers are shaped along the direction in which the rubbing cloth moves within the area covered by the light shielding member, and the aperture ratio is not reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an active matrix substrate of a liquid crystal display device to which an embodiment of the present invention is applied.

FIG. 2 is a partial cross-sectional view of the liquid crystal display device shown in FIG. 1, taken at a position of a TFT.

FIG. 3 is a partial cross-sectional view of the liquid crystal display device shown in FIG. 1 taken at a position of a columnar spacer.

FIG. 4 is a partial cross-sectional view showing another example of the counter substrate of the liquid crystal display device shown in FIGS. 1 to 3;

FIG. 5 is a partial cross-sectional view showing another embodiment of the liquid crystal display device shown in FIGS. 1 to 3 and 4;

6 is a schematic plan view of the liquid crystal display device shown in FIG.

FIG. 7 is a schematic view showing a liquid crystal display device which is an example of a comparative example.

8 is a schematic diagram illustrating the reason why an incompletely rubbed region occurs during a rubbing process in the liquid crystal display device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Active matrix type liquid crystal display device, 10 ... Active matrix substrate, 11 ... Glass substrate, 12 ... TFT (thin film transistor), 13 ... Pixel electrode, 14 ... Scanning line, 15 ... Signal line, 16 ... Storage capacitance electrode, 17 ... Gate electrode, 18 ... Source electrode, 19 ... Drain electrode, 20 ... Gate insulating film, 21 ... Semiconductor layer, 22 ... Protective insulating film, 24 ... Low resistance semiconductor layer, 28 ... Oriented film, 30 ... Counter substrate, 31 ... Glass Substrate, 32: black matrix, 33: colored layer, 33 ': colored layer, 33 ": colored layer, 37: columnar spacer, 38: alignment film, 50: liquid crystal material.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Minoru Sasaki, Inventor, Toshiba Yokohama Office, 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa

Claims (3)

[Claims] 1. A plurality of scanning lines and a plurality of signal lines which are arranged on one main surface so as to intersect with each other, and are formed at each intersection of the scanning lines and the signal lines. An active matrix in which connected thin film transistors, pixel electrodes connected to each of the thin film transistors, and a storage capacitor electrode and a wiring in which a part of a scanning line is extended to the display electrode side to form a storage capacitor. A substrate, a counter electrode having a counter electrode on a main surface, a color filter including a coloring layer, and an inter-substrate gap material forming a columnar projection for providing a desired gap; After forming an alignment film on the main surface, each of the alignment films is subjected to an alignment treatment by rubbing, and the main surfaces of the active matrix substrate and the counter substrate are opposed to each other. In an active matrix type liquid crystal display device sandwiching a crystal composition, when a storage capacitor electrode forming a storage capacitor is used as a liquid crystal display device by combining the two substrates, a rubbing process is performed on the opposing substrate during a Rabink alignment process. The rubbing member used for rubbing is formed so as to extend in the wake side direction in the direction in which the rubbing member is moved, and the inter-substrate gap material forms a display electrode on a scanning line or a part of the scanning line. An active matrix liquid crystal display device having a shape protruding to the side and being connected to an active matrix substrate near a scanning electrode of a storage capacitor electrode forming a storage capacitor. 2. A plurality of scanning lines and a plurality of signal lines arranged so as to intersect with each other on one main surface, and formed at each intersection of the scanning lines and the signal lines. A connected thin film transistor, a pixel electrode connected to each thin film transistor, a storage capacitor electrode and a wiring forming a shape in which a part of the scanning line is protruded to the display electrode side to form a storage capacitor, and a coloring layer. An active matrix substrate on which an inter-substrate gap material including columnar projections having a predetermined height is provided to provide a desired gap; and a counter substrate having a counter electrode on one main surface; After forming an alignment film on one main surface of the substrate and performing an alignment process by rubbing, the main surfaces of the active matrix substrate and the counter substrate are opposed to each other, and a liquid crystal is interposed therebetween. In an active matrix type liquid crystal display device sandwiching a composition, a storage capacitor electrode forming a storage capacitor is parallel to a rubbing direction at the time of rubbing orientation treatment of the active matrix substrate, and a processing member used by rubbing is moved. Are formed along a direction in which the storage capacitor electrode forms a shape in which the inter-substrate gap material extends over the scan line or a part of the scan line toward the display electrode, and is formed on the scan electrode side of the storage capacitor electrode forming the storage capacitor. An active matrix type liquid crystal display device characterized by being formed. 3. An inter-substrate gap material forming a columnar projection is a photosensitive material showing each of three primary colors of light for performing color display, red, blue and green, and a light shielding layer between colored layers. 3. The active matrix type liquid crystal display device according to claim 1, wherein the active matrix type liquid crystal display device is formed by a single layer or a laminated layer of a black photosensitive material or another white or transparent photosensitive material.