JP2002049028A - Liquid crystal display device and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of suppressing the decrease of the aperture ratio of a conventional transverse electric field applying system type liquid crystal display device and reducing display defects such as afterimage and burning, and to provide its manufacturing method. SOLUTION: The width of a shading layer 11 can be narrowly formed and the numerical aperture can be enhanced by forming a color filter 10 and the shading layer 11 on an array substrate and the residue of charges can be suppressed and the display defects of the afterimage and burning can be suppressed by forming the color filter 10 on au upper layer of a common electrode 2 and a pixel electrode 5 to completely insulate the pixel electrode 5 and the common electrode 2 from a liquid crystal layer.

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 liquid crystal display device having a wide viewing angle and high luminance.

[0002]

2. Description of the Related Art A conventional liquid crystal display device will be described below with reference to the drawings.

FIG. 5 is a cross-sectional view of a liquid crystal display of a lateral electric field application type disclosed in Japanese Patent Application Laid-Open No. 9-236820. Here, the lateral electric field application method means that both a pixel electrode and a common electrode are formed on one inner surface of a transparent substrate on the same surface, and a potential is applied between the pixel electrode and the common electrode formed on these same surfaces. This is a method of controlling the alignment of liquid crystal molecules by applying a horizontal electric field to the liquid crystal in a direction parallel to the plate surface of the transparent substrate,
Thereby, the viewing angle dependence of the display of the device is improved.

FIG. 5A shows a cross section in a direction perpendicular to a source bus line (video signal line) and in a vertical direction (a direction perpendicular to the substrate surface) of a portion without a semiconductor switch element to be described later. FIG. 5B shows a cross section of a portion where the semiconductor switch element exists, and FIG. 5C shows a cross section of the portion where the semiconductor switch element exists in a direction parallel to the source bus line.

In FIG. 5, 1a is a lower transparent substrate and 1b is an upper transparent substrate. 2 is a common electrode. 3 is a gate electrode. 4 is a source bus line. 5 is
The pixel electrode 5a is an extended end thereof. 6 is a semiconductor switch element. 7 is a liquid crystal layer. 8a is a lower alignment film, and 8b is an upper alignment film. 9 is a transparent insulating layer.

As shown in FIG. 5, in this liquid crystal display device, two transparent substrates 1a and 1b are arranged to face each other, and a liquid crystal 7 is sealed between the opposing surfaces via alignment films 8a and 8b. The point that the alignment films 8a and 8b are in contact with the upper and lower surfaces of the liquid crystal 7 to align the liquid crystal molecules in a predetermined alignment is the same as that conventionally widely used.

[0007]

However, in the case of the above-mentioned liquid crystal display device, the following problems remain.

(1) It is difficult to completely eliminate the displacement between the light-shielding layer provided on the opposing substrate and the source bus line or the common electrode when the array-side substrate and the opposing substrate are bonded to each other. Therefore, the light-shielding portion must be widened as a margin, and the aperture ratio is reduced.

(2) Since the common electrode and the pixel electrode are formed of a non-transparent material that does not transmit light in the pixel portion, the aperture ratio is reduced.

(3) When a pixel electrode and a common electrode are formed in the pixel portion and no protective insulating layer is provided on both of the electrodes or one of the electrodes, afterimages and image sticking occur.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been devised with a light shielding layer and a color filter. Specifically, the configuration is as follows.

According to the first aspect of the present invention, an array-side substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed; A transmissive or reflective liquid crystal display device of a lateral electric field application method having a spacer and
The common electrode and the pixel electrode are formed in different layers with an insulating layer interposed therebetween. The insulating layer is a color filter (including equivalents) of three colors, such as red, green, and blue (others, cyan, magenta, and yellow). This is characterized in that the insulating layer is also used as a color filter which is also used as a material for forming a color filter.

According to the above configuration, the following operation is performed in a liquid crystal display device having a common electrode, a pixel electrode, a scanning signal line, a video signal line, an array substrate on which a semiconductor switch element and a light shielding layer are formed, and a counter substrate. You.

In the method of bonding the array-side substrate, the black light-shielding layer, and the opposite substrate on which three color filters of red, green, blue, etc. (others, cyan, magenta, and yellow) are formed, the size of the pixel is small. Therefore, it is difficult to completely eliminate the displacement between the light shielding layer provided on the counter substrate and the source bus line or the common electrode. For this reason, the light-shielding portion must be expanded as a margin, and the aperture ratio decreases, whereas if the light-shielding layer and the color filter are formed on the array substrate, the width of the light-shielding layer can be reduced. It becomes possible and the aperture ratio can be improved.

According to a second aspect of the present invention, there is provided an array-side substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed; A transmissive or reflective liquid crystal display device of a lateral electric field application method having a spacer and
It is characterized in that three color filters (including equivalents) of three colors, such as red, green, and blue (others, cyan, magenta, and yellow), are formed below the common electrode and the pixel electrode.

With the above structure, the following operation is performed in the liquid crystal display device having the common electrode, the pixel electrode, the scanning signal line, the video signal line, the array side substrate on which the semiconductor switch element and the light shielding layer are formed, and the counter substrate. You.

In the method of bonding the array side substrate and the opposing substrate on which a black light-shielding layer and three color filters (including equivalents) of red, green, blue, etc. (others, cyan, magenta, yellow) are formed. Since the size of the pixel is small, it is difficult to completely eliminate the displacement between the light shielding layer provided on the counter substrate and the source bus line or the common electrode. For this reason, the light-shielding portion must be widened as a margin, and the aperture ratio decreases, whereas if the light-shielding layer and the color filter are formed on the array substrate, the width of the light-shielding layer can be reduced. Thus, the aperture ratio can be improved.

According to a third aspect of the present invention, there is provided an array-side substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed; A transmissive or reflective liquid crystal display device of a lateral electric field application method having a spacer and
Three color filters (including equivalents) of red, green, blue, etc. (including cyan, magenta, and yellow) are formed on the common electrode and the pixel electrode formed on different layers via an insulating layer. It is characterized by being.

With the above configuration, the following operation is performed in the liquid crystal display device having the common electrode, the pixel electrode, the scanning signal line, the video signal line, the array side substrate on which the semiconductor switch element and the light shielding layer are formed, and the counter substrate. You.

In the method of laminating the array side substrate and the opposite substrate on which a black light-shielding layer and three color filters (including equivalents) of red, green, blue and the like (others, cyan, magenta, yellow) are formed. Since the size of the pixel is small, it is difficult to completely eliminate the displacement between the light shielding layer provided on the counter substrate and the source bus line or the common electrode. For this reason, the light-shielding portion must be expanded as a margin, and the aperture ratio decreases. On the other hand, if a color filter is formed on the array substrate, the width of the light-shielding layer can be reduced, and the aperture ratio can be reduced. Can be improved.

Further, since the common electrode can be sufficiently insulated from the liquid crystal layer by a color filter, the residual charge in the pixel portion can be suppressed, and an image without an afterimage or a burn-in can be displayed.

According to a fourth aspect of the present invention, there is provided an array-side substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed; A transmissive or reflective liquid crystal display device of a lateral electric field application method having a spacer and
Red, over the common electrode and pixel electrode formed on the same layer
Green, blue, etc. (others, cyan, magenta, yellow)
It is characterized in that color filters (including equivalents) of colors are formed.

With the above structure, the following operation is performed in the liquid crystal display device having the common electrode, the pixel electrode, the scanning signal line, the video signal line, the semiconductor substrate, the array side substrate on which the light shielding layer is formed, and the counter substrate. You.

In the method of laminating the array side substrate and a counter substrate on which a black light-shielding layer and three color filters (including equivalents) of red, green, blue, etc. (others, cyan, magenta, yellow) are formed. Since the size of the pixel is small, it is difficult to completely eliminate the displacement between the light shielding layer provided on the counter substrate and the source bus line or the common electrode. For this reason, it is necessary to expand the light shielding part as a margin,
On the other hand, when the color filter is formed on the array substrate, the width of the light-shielding layer can be reduced, and the aperture ratio can be improved.

Further, since the common electrode can be sufficiently insulated from the liquid crystal layer by a color filter, the residual charge in the pixel portion can be suppressed, and an image without an afterimage or burn-in can be displayed.

According to a fifth aspect of the present invention, one of the common electrode and the pixel electrode is formed of a transparent conductive layer.

With the above configuration, the following operation is performed in a liquid crystal display device having a common electrode, a pixel electrode, a scanning signal line, a video signal line, an array substrate on which a semiconductor switch element and a light shielding layer are formed, and a counter substrate. You.

Since one of the common electrode and the pixel electrode is formed of a transparent conductive layer, light is transmitted through a portion which did not transmit light in the past, so that the aperture ratio can be substantially improved.

According to a sixth aspect of the present invention, both the common electrode and the pixel electrode are formed of a transparent conductive layer.

With the above configuration, the following operation is performed in a liquid crystal display device having a common electrode, a pixel electrode, a scanning signal line, a video signal line, an array substrate on which a semiconductor switch element and a light shielding layer are formed, and a counter substrate. You.

Since both the common electrode and the pixel electrode are formed of a transparent conductive layer, light is transmitted through a portion which did not transmit light in the past, so that the aperture ratio can be substantially improved.

According to a seventh aspect of the present invention, the semiconductor switching element is a channel-etch type thin film transistor.

According to the above configuration, the following operation is performed in the liquid crystal display device having the common electrode, the pixel electrode, the scanning signal line, the video signal line, the array side substrate on which the semiconductor switch element and the light shielding layer are formed, and the counter substrate. You.

The common electrode and / or the pixel electrode can be formed of a transparent conductive layer formed in a final process for forming a channel-etch thin film transistor, and a portion which does not transmit light conventionally. Since light is also transmitted, the aperture ratio can be substantially improved, and an array substrate can be manufactured without complicating the manufacturing process.

According to the eighth aspect of the invention, a part of the semiconductor switch element is formed of polysilicon.

With the above configuration, the following operation is performed in the liquid crystal display device having the common electrode, the pixel electrode, the scanning signal line, the video signal line, the array side substrate on which the semiconductor switch element and the light shielding layer are formed, and the counter substrate. You.

Since the mobility of the semiconductor switching element is large, even in a liquid crystal display device having a small pixel size, charges can be sufficiently stored in the pixel, and high-definition display can be performed.

According to a ninth aspect of the present invention, the electrode portions forming the common electrode and the pixel electrode are of a bent shape having at least one bent portion in the pixel.

With the above structure, the following operation is performed in the liquid crystal display device having the common electrode, the pixel electrode, the scanning signal line, the video signal line, the array side substrate on which the semiconductor switch element and the light shielding layer are formed, and the counter substrate. You.

Since the major axis direction of the liquid crystal molecules in the pixel is line-symmetric with respect to the bent portion, when the panel is viewed from an oblique direction, it is possible to perform display with suppressed color change.

The tenth aspect of the present invention is characterized in that the video signal line has a bent shape having substantially the same bending angle as the bent shape of the electrode portion forming the common electrode and the pixel electrode.

According to the above configuration, the following operation is performed in the liquid crystal display device having the common electrode, the pixel electrode, the scanning signal line, the video signal line, the array side substrate on which the semiconductor switch element and the light shielding layer are formed, and the counter substrate. You.

By forming the video signal line also in a bent shape, the area surrounded by the video signal line and the common electrode or pixel electrode closest to the video signal line in the pixel is reduced, and the aperture ratio is improved.

In the eleventh aspect, a step of forming a non-transmissive conductor on a transparent substrate and pattern-forming a first electrode group including a part of a common electrode and a scanning signal line in a predetermined shape; Forming a first insulating layer on the transparent substrate on which the first electrode group is formed; forming a semiconductor layer on a predetermined portion of the first insulating layer; Forming a non-transmissive conductor thereon and pattern-forming a second electrode group including a video signal line and a pixel electrode into a predetermined shape; and forming a second insulating layer on the transparent substrate on which the second electrode group and the second electrode group are formed. Forming a layer, and forming a color filter group in a predetermined shape on the second insulating layer;
Forming a transparent conductor on the color filter group and pattern-forming a third electrode group to be a part of a common electrode in a predetermined shape.

According to the above manufacturing method, a liquid crystal display device having a high luminance and a wide viewing angle can be obtained with the structure of the first aspect.

In a twelfth aspect of the present invention, a step of forming a non-transmissive conductor on a transparent substrate and pattern-forming a first electrode group including a part of a common electrode and a scanning signal line in a predetermined shape; Forming a first insulating layer on the transparent substrate on which the first electrode group is formed; forming a semiconductor layer on a predetermined portion of the first insulating layer; Forming a non-transmissive conductor thereon and pattern-forming a second electrode group consisting of a part of a video signal line and a pixel electrode in a predetermined shape; and forming the second electrode group on the transparent substrate on which the second electrode group is formed. Forming a color filter group in a predetermined shape on the second insulating layer; forming a transparent conductor on the color filter group to form a pixel electrode on the second insulating layer; The third electrode group consisting of the part and the common electrode is patterned into a predetermined shape. It is characterized by a manufacturing method comprising the steps of over down form, a. By the above manufacturing method,
With the configuration according to the second aspect, a liquid crystal display device having high luminance and a wide viewing angle can be obtained.

In a thirteenth aspect of the present invention, a step of forming a non-transmissive conductor on a transparent substrate and pattern-forming a first electrode group including a part of a common electrode and a scanning signal line in a predetermined shape; Forming a first insulating layer on the transparent substrate on which the first electrode group is formed; forming a semiconductor layer on a predetermined portion of the first insulating layer; Forming a non-transmissive conductor thereon and pattern-forming a second electrode group including a video signal line and a pixel electrode in a predetermined shape; and forming a second electrode group on the transparent substrate on which the second electrode group is formed. Forming an insulating layer; and forming a third conductive layer on the second insulating layer by forming a transparent conductor on the second insulating layer.
The method is characterized in that it is a manufacturing method including a step of patterning an electrode group into a predetermined shape and a step of forming a color filter group into a predetermined shape on the third electrode group.

According to the above-described manufacturing method, a liquid crystal display device having a high luminance, a wide viewing angle, and no image sticking or image sticking can be obtained.

In the invention according to claim 14, a step of forming a non-transmissive conductor on a transparent substrate and pattern-forming a first electrode group consisting of a part of a common electrode and a scanning signal line in a predetermined shape; Forming a first insulating layer on the transparent substrate on which the first electrode group is formed; forming a semiconductor layer on a predetermined portion of the first insulating layer; Forming a non-transmissive conductor thereon and pattern-forming a second electrode group consisting of a part of a video signal line and a pixel electrode in a predetermined shape; and forming the second electrode group on the transparent substrate on which the second electrode group is formed. Forming a second conductive layer on the second insulating layer, forming a transparent conductor on the second insulating layer, and forming a third electrode group including a part of the pixel electrode and a part of the common electrode into a predetermined shape. And forming a color filter group on the third electrode group into a predetermined shape. It is characterized by a manufacturing method comprising the steps of forming a.

According to the above-mentioned manufacturing method, a liquid crystal display device having high luminance, a wide viewing angle and no afterimage or image sticking can be obtained.

According to the fifteenth aspect of the present invention, the light-shielding layer and the color filters (including equivalents) of three colors of red, green, blue, etc. (including cyan, magenta, and yellow) are arranged in a direction perpendicular to the substrate surface. It is characterized in that it is formed via an insulating layer when viewed.

With the above structure, the common electrode, the pixel electrode, the scanning signal line, the video signal line, the semiconductor switch element, the light-shielding layer, the color filters of three colors of red, green, blue, etc. (others, cyan, magenta, yellow) In the liquid crystal display device having the array-side substrate on which the liquid crystal display device (including the equivalent) is formed, and the counter substrate, the following operation is performed.

When a voltage is applied to the pixel electrode,
When the electric field distribution in the liquid crystal layer changes, the charge moves to the light-shielding layer and is accumulated, and when the voltage of the pixel electrode changes, the charge stored in the light-shielding layer flows into the color filter, resulting in a display such as an afterimage or burn-in. Although it will be defective, by having a structure in which the light shielding layer and the color filter are formed via the insulating layer when viewed from the direction orthogonal to the substrate surface,
The charge stored in the light-shielding layer is prevented from flowing into the color filter, and a display without afterimages or image sticking can be performed.

[0054]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on its embodiments.

(First Embodiment) The present embodiment relates to a liquid crystal display device of a horizontal electric field application type. Hereinafter, the present embodiment will be described with reference to the drawings.

FIG. 1A is a plan view of a main part of the liquid crystal display device according to the present embodiment as viewed from above, and FIG.
FIG. 3A is a cross-sectional view taken along line AA ′ in FIG.

In both figures, the same parts (parts, configurations) as in FIG. 5 showing the prior art liquid crystal display device are, in principle, given the same reference numerals as in FIG. 5 unless they relate to the gist of the present invention. . Therefore, their description is omitted. This is the same in other embodiments to be described later.

Reference numeral 6 denotes a semiconductor switch element. 10
Is a color filter (including an equivalent) of any one of three colors such as red, green, and blue. 11 is a light-shielding layer.

Hereinafter, this technical content will be described focusing on the manufacturing method.

First, a scanning signal line (gate bus line) 3 patterned with a conductive film made of Al or the like is formed on a transparent substrate 1a, and an insulating film (not shown) is formed on the upper surface thereof.
Is formed, a video signal line (source bus line) 4 patterned with a semiconductor switch element 6 made of amorphous silicon or polysilicon or a conductive film made of Al or the like.
And a pixel electrode 5 are formed.

Next, a black light-shielding layer 1 having a thickness of about 1 to 2 μm
1 and red, green, and blue color filters 10 are sequentially formed.

In this forming method, a resist is applied so that the color filter 10 is formed in a portion where the red color filter 10 is necessary, specifically, in the red pixel and its peripheral portion. The portion of the red color filter 10 to which is not applied is removed by etching.

Next, a green color filter is formed only on a necessary portion on the entire surface of the substrate on which the red color filter is formed. Then, the portion where the green color filter is required, specifically, only the portion of the green pixel and its peripheral portion is similarly left on the substrate by applying a resist and then etching, and the other portions are Removed. Finally,
A blue color filter is formed by substantially the same means.

As a material of the color filter 10, a material in which a pigment or a dye is dispersed in an acrylic resin material is used.

Further, on the color filter 10, the common electrode 2 is patterned in the form of a comb with an ITO film as a transparent conductor or a conductive film made of Al or the like, thereby producing an array substrate.

Thereafter, an alignment film 8a for aligning the arrangement of liquid crystal molecules is formed of polyimide or the like.

Further, an alignment film 8b is similarly formed on the opposing transparent substrate 1b.

The upper and lower transparent substrates thus produced are rubbed in a predetermined direction with a rubbing cloth, respectively.
A sealant is printed on the periphery, beads (not shown) for maintaining the gap between the upper and lower transparent electrodes are dispersed, bonded and bonded, and an injection portion (hole) formed in advance in the space between the transparent substrates. Then, the material is injected by a vacuum suction method or the like, and then the injection part is sealed.

Next, the function of the display device will be described.

The semiconductor switch element 6 is turned on and off by drive signals input from the video signal line 4 and the scan signal line 3.
Controlled off. Then, an electric field is generated by a voltage applied between the pixel electrode 5 connected to the semiconductor switch element 6 and the common electrode 2, the orientation of the liquid crystal 7 is changed, the brightness of each pixel is controlled, and the image is displayed. indicate. Therefore, the operation up to this point is the same as that of the conventional liquid crystal display device of the lateral electric field application method.

However, in the conventional lateral electric field application method, since the light shielding layer 11 is formed on the opposing substrate, the size of the pixel is small when bonding to the array side substrate. It is difficult to completely eliminate the positional shift between the scanning signal line 3 and the source bus line 4 or the scanning signal line 3, so that the light shielding portion must be expanded as a margin, and the aperture ratio decreases.

However, in the present display device, since the light-shielding layer 11 and the color filter 10 are formed directly on the array substrate 1a, the displacement caused when the upper and lower transparent substrates shown in FIG. It becomes possible. As a result, a decrease in the aperture ratio due to the manufacturing process can be prevented.

In the conventional lateral electric field application method, since the pixel electrode 5 and the common electrode 2 in the pixel are formed of a non-transparent material such as Al, the aperture ratio is reduced.

However, in the present display device, since the common electrode 2 is formed of the transparent conductive layer, light is transmitted through a portion which did not transmit light in the past, so that the aperture ratio can be substantially improved.

(Second Embodiment) The present embodiment relates to a liquid crystal display device of a lateral electric field application type. Hereinafter, the present embodiment will be described with reference to FIG.

FIG. 2A shows a plan view of the main part of the liquid crystal display device of the present embodiment as viewed from above, and FIG. 2B shows the plan view of FIG.
2 shows a cross-sectional view taken along line BB ′.

Hereinafter, this technical content will be described focusing on the manufacturing method with reference to FIG.

First, a scanning signal line 3 patterned with a conductive film made of Al or the like is formed on the transparent substrate 1a on the array side, and an insulating film (not shown) is further formed on the upper surface thereof. A video signal line 4 patterned with a semiconductor switch element 6 made of polysilicon or the like and a conductive film made of Al or the like is formed.

Next, the red, green and blue color filters 10
And the light shielding layer 11 are sequentially formed at predetermined positions. The formation method at this time is the same as that of the first embodiment.

Then, a pixel electrode 5 and a common electrode 2 corresponding to each pixel are formed of an ITO film or the like which is a transparent conductor on the color filter 10 of each color, and an array substrate is manufactured.

The subsequent steps from formation of the alignment film to sealing are the same as those in the first embodiment.

The function of this display device is described in the first section.
This is the same as the embodiment.

Incidentally, also in the present embodiment, the light shielding layer 11
The point that the color filters 10 are formed on the array substrate is the same as in the first embodiment. Therefore, the same effects as those of the first embodiment are obtained.

In the conventional lateral electric field application method, since the pixel electrode 5 and the common electrode 2 in the pixel are formed of a non-transparent material such as Al, the aperture ratio is reduced.

However, in the present display device, since the common electrode 2 and the pixel electrode 5 are formed of a transparent conductive material, the aperture ratio does not decrease.

(Third Embodiment) The present embodiment relates to a liquid crystal display device of a lateral electric field application type. Hereinafter, the present embodiment will be described with reference to FIG.

FIG. 3A is a plan view of a main part of the liquid crystal display device according to the present embodiment as viewed from above, and FIG. 3B is a plan view of FIG.
2 shows a cross-sectional view taken along line CC ′.

Hereinafter, this technical content will be described focusing on the manufacturing method with reference to FIG.

First, a scanning signal line 3 patterned with a conductive film made of Al or the like is formed on the transparent substrate 1a on the array side, and an insulating film (not shown) is further formed on the upper surface thereof. A semiconductor switching element 6 made of polysilicon or the like, a video signal line 4 patterned with a conductive film made of Al or the like, and a pixel electrode 5 are formed, and a transparent insulating layer 9 for protecting the semiconductor switching element 6 is formed. After that, the common electrode 2 is formed of a transparent conductor such as an ITO film. Thereafter, similarly to the first embodiment, a color filter 10 of three colors and a light shielding layer 11 are formed, and an array substrate is manufactured.

The subsequent steps from the formation of the alignment film to the sealing are the same as those in the first embodiment.

The function of this display device is described in the first section.
This is the same as the embodiment.

Incidentally, also in the present embodiment, the light shielding layer 11
And the color filter 10 are formed on an array substrate, and the common electrode 2 is formed of a transparent conductive material.
This is the same as the first embodiment. Therefore, the first
The same effect as that of the embodiment can be obtained.

Further, since the common electrode 2 is in contact with the liquid crystal layer via the color filter 10 and the alignment film, the electric charge accumulated in the pixel is reduced, and there is also an effect of preventing afterimages and image sticking.

(Fourth Embodiment) The present embodiment relates to a liquid crystal display device of a lateral electric field application type. Hereinafter, the present embodiment will be described with reference to FIG.

FIG. 4A shows a plan view of the main part of the liquid crystal display device of the present embodiment as viewed from above, and FIG. 4B shows FIG. 1A.
2 shows a cross-sectional view taken along line DD ′.

Hereinafter, this technical content will be described focusing on the manufacturing method with reference to FIG.

First, a scanning signal line 3 patterned with a conductive film made of Al or the like is formed on the transparent substrate 1a on the array side, and an insulating film (not shown) is formed on the upper surface thereof. The semiconductor switch element 6 made of polysilicon or the like and the video signal line 4 patterned with a conductive film made of Al or the like are formed, and an insulating layer for protecting the semiconductor switch element 6 is formed (not shown). Thereafter, the common electrode 2 and the pixel electrode 5 are formed of an ITO film or the like which is a transparent conductor. Thereafter, the color filters 10 and the light shielding layers 11 of three colors are formed in the same manner as in the first embodiment.

The subsequent steps from the formation of the alignment film to the sealing are the same as those in the first embodiment.

The function of this display device is described in the first section.
This is the same as the embodiment.

Incidentally, also in this embodiment, the light shielding layer 11
The point that the color filter 10 is formed on the array substrate and the point that the common electrode 2 and the pixel electrode 5 are formed of a transparent conductive material are the same as in the second embodiment. Therefore, the same effects as those of the second embodiment are obtained.

Further, the structure in which the common electrode 2 is in contact with the liquid crystal layer via the color filter 10 and the alignment film is the same as in the third embodiment. Therefore, the same effect as in the third embodiment is obtained.

Although the present invention has been described based on several embodiments, it is needless to say that the present invention is not limited to these embodiments. That is, for example, the following may be performed.

1) Since the video signal line 4 is also bent, the area surrounded by the common electrode 2 or the pixel electrode 5 closest to the video signal line 4 in the pixel and the video signal line 4 is reduced, and the aperture ratio is reduced. Is improved.

2) In order to prevent the residual charges accumulated in the light shielding layer 11 from flowing into the color filter 10, an insulating layer is formed after the formation of the light shielding layer 11, and the color filter 10 is formed.
If the light shielding layer and the color filter layer are insulated, afterimages and image sticking can be suppressed.

3) In the first to fourth embodiments, the color filter 10 is formed like a pixel by etching the color filter 10 after applying, exposing and developing a photoresist on the upper layer. The effect does not change even with the color filter 10 using a film resist that also has the function of (1).

4) As a developer used for photolithography for forming the light-shielding layer 11 and the color filter 10, an organic alkali-based developer is preferable to an inorganic alkali-based developer that deteriorates the characteristics of the semiconductor switching element 6.

[0107]

As described above, according to the present invention, in a lateral electric field application type liquid crystal display device, by forming a color filter 10 and a light shielding layer 11 on an array substrate, a high luminance and a wide viewing angle can be obtained. Display without afterimages or burn-in is possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of a liquid crystal display device based on a first embodiment.

FIG. 2 is a diagram showing a main part of a liquid crystal display device according to a second embodiment.

FIG. 3 is a diagram showing a main part of a liquid crystal display device based on a third embodiment.

FIG. 4 is a diagram showing a main part of a liquid crystal display device according to a fourth embodiment.

FIG. 5 is a cross-sectional view of a lateral electric field application type liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 1a transparent substrate 1b transparent substrate 2 common electrode 3 scanning signal line 4 video signal line 5 pixel electrode 6 semiconductor switching element 7 liquid crystal 8a alignment film 8b alignment film 9 transparent insulating layer 10 color filter 11 light shielding layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/30 349 G02F 1/136 500 (72) Inventor Akinori Shioda 1006 Odakadoma, Kadoma City, Osaka Matsushita F-term (Reference) in Denki Sangyo Co., Ltd.

Claims (15)

[Claims] 1. An array substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed, a counter substrate, and sandwiched between the array substrate and the counter substrate. A liquid crystal display comprising a liquid crystal layer, wherein the common electrode and the pixel electrode are formed in different layers with an insulating layer interposed therebetween, wherein the insulating layer is a color filter material. apparatus. 2. An array substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed, a counter substrate, and sandwiched between the array substrate and the counter substrate. A liquid crystal display device comprising: a liquid crystal layer, wherein the common electrode and the pixel electrode are formed in the same layer, and a color filter layer is provided below the common electrode and the pixel electrode. apparatus. 3. An array substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed, a counter substrate, and sandwiched between the array substrate and the counter substrate. A liquid crystal display device comprising a liquid crystal layer, wherein the common electrode and the pixel electrode are formed in different layers via an insulating layer, and further provided with an insulating layer on the upper layer, wherein the upper insulating layer is made of a color filter material. A liquid crystal display device, comprising: 4. An array substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, and a light-shielding layer are formed, a counter substrate, and sandwiched between the array substrate and the counter substrate. A liquid crystal display device comprising a liquid crystal layer, wherein the common electrode and the pixel electrode are formed in the same layer, and an insulating layer is provided on an upper layer, wherein the upper insulating layer is a color filter material. Display device. 5. The liquid crystal display device according to claim 1, wherein one of the common electrode and the pixel electrode is formed of a transparent conductive layer. 6. The liquid crystal display device according to claim 2, wherein both the common electrode and the pixel electrode are formed of a transparent conductive layer. 7. The semiconductor switching device according to claim 1, wherein said semiconductor switching device is a channel-etch type thin film transistor.
7. The liquid crystal display device according to any one of items 1 to 6. 8. The liquid crystal display device according to claim 1, wherein a part of said semiconductor switching element is formed of polysilicon. 9. The liquid crystal according to claim 1, wherein an electrode portion forming the common electrode and the pixel electrode has a bent shape having at least one bent portion in a pixel. Display device. 10. A video signal line according to claim 1, wherein said video signal line has a bent shape having substantially the same bending angle as a bent shape of an electrode portion forming said common electrode and said pixel electrode.
The liquid crystal display device according to any of the above. 11. A step of forming a non-transmissive conductor on a transparent substrate and patterning a first electrode group consisting of a part of a common electrode and a scanning signal line into a predetermined shape, and forming the first electrode group. Forming a first insulating layer on the transparent substrate, and forming a semiconductor layer on a predetermined portion of the first insulating layer;
Forming a non-transmissive conductor on the first insulating layer and the semiconductor layer, and patterning a second electrode group including a video signal line and a pixel electrode into a predetermined shape; and forming up to the second electrode group. Forming a second insulating layer on the formed transparent substrate;
Forming a color filter group in a predetermined shape on the second insulating layer; and forming a transparent electrode on the color filter group to form a third electrode group which is a part of a common electrode. Forming a pattern in a shape. 12. A step of forming a non-transmissive conductor on a transparent substrate and patterning a first electrode group consisting of a part of a common electrode and a scanning signal line into a predetermined shape, and forming the first electrode group. Forming a first insulating layer on the transparent substrate, and forming a semiconductor layer on a predetermined portion of the first insulating layer;
Forming a non-transmissive conductor on the first insulating layer and the semiconductor layer and pattern-forming a second electrode group consisting of a part of a video signal line and a pixel electrode in a predetermined shape; Forming a second insulating layer on the transparent substrate having the above-described steps, forming a color filter group in a predetermined shape on the second insulating layer, and forming a transparent layer on the color filter group. Forming a conductor and pattern-forming a third electrode group consisting of a part of the pixel electrode and a part of the common electrode in a predetermined shape. 13. A step of forming a non-transmissive conductor on a transparent substrate and patterning a first electrode group consisting of a part of a common electrode and a scanning signal line into a predetermined shape, and forming the first electrode group. Forming a first insulating layer on the transparent substrate, and forming a semiconductor layer on a predetermined portion of the first insulating layer;
Forming a non-transmissive conductor on the first insulating layer and the semiconductor layer, and patterning a second electrode group including a video signal line and a pixel electrode into a predetermined shape; and forming up to the second electrode group. Forming a second insulating layer on the transparent substrate, and forming a third electrode group consisting of a part of a common electrode on the second insulating layer into a predetermined shape by patterning. And a step of forming a color filter group in a predetermined shape on the third electrode group. 14. A step of forming a non-transmissive conductor on a transparent substrate and patterning a first electrode group consisting of a part of a common electrode and a scanning signal line into a predetermined shape, and forming the first electrode group. Forming a first insulating layer on the transparent substrate, and forming a semiconductor layer on a predetermined portion of the first insulating layer;
Forming a non-transmissive conductor on the first insulating layer and the semiconductor layer and pattern-forming a second electrode group consisting of a part of a video signal line and a pixel electrode in a predetermined shape; Forming a second insulating layer on the transparent substrate on which a transparent electrode is formed and forming a third conductive layer on the second insulating layer, the third conductive layer being formed of a part of a pixel electrode and a part of a common electrode. A method for manufacturing a liquid crystal display device, comprising: a step of patterning an electrode group in a predetermined shape; and a step of forming a color filter group in a predetermined shape on the third electrode group. 15. An array substrate on which a common electrode, a pixel electrode, a scanning signal line, a video signal line, a semiconductor switch element, a light shielding layer, and a color filter are formed, a counter substrate, and a space between the array substrate and the counter substrate. A liquid crystal display device comprising a sandwiched liquid crystal layer, wherein the color filter and the light shielding layer are formed via an insulating layer.