JPH11125840A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct its fault and to minimize a loss of display quality when a fault such as a short circuit, etc., occurs between a pixel electrode and a common electrode by making one side between the pixel electrode and a counter electrode shape and cutting off a branched part related to a short circuit fault when the short circuit fault occurs between both electrodes. SOLUTION: One side between the pixel electrode 18a and the counter electrode 19a is formed into the branched shape, and when the short circuit fault occurs between the pixel electrode 18a and the counter electrode 19a, the branched part related to the short circuit fault is cut off. In such a case, the pixel electrode 18a is cut off on a cut-off point 21 placed to an additive capacity 3 side than the short circuit fault part by a laser. Thus, since a voltage isn't applied no an area between the pixel electrode 18a and the counter electrode 19b, and the area between the pixel electrode 18a and the counter electrode 19a, though these areas are a dark display as it is, since an original signal voltage is applied to the pixel electrodes 18b-18d excepting them, a display becomes possible in the area excepting the area becoming the dark display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device used as a display device such as a monitor.

[0002]

2. Description of the Related Art As display modes in a liquid crystal display device, for example, TN (Twisted Nematic) mode, STN
(Super-Twisted Nematic) mode, GH (Guest-Hos
t) modes are known. In these display modes, liquid crystal is sealed between two transparent electrode substrates, and a display operation is performed by applying an electric field in a direction perpendicular to the surfaces of both transparent electrode substrates.

On the other hand, electrodes are arranged in a comb shape on one of two substrates sandwiching a liquid crystal layer, and a display operation is performed by applying a horizontal electric field parallel to the substrates.
A display mode called a PS (In-Plane-Switching) mode has been proposed. According to the IPS mode, the viewing angle characteristics are particularly excellent as compared with the case of the TN mode, for example.

As a liquid crystal display device in the IPS mode, for example, Japanese Patent Application Laid-Open No. 8-286176 discloses the following liquid crystal display device.

FIG. 7 is a plan view showing an electrode structure in a unit pixel in the above-mentioned conventional liquid crystal display device. The thin film transistor element 31 includes a pixel electrode 37, a signal electrode 32, a scanning electrode 33, and amorphous silicon. The common electrodes 35 are formed so as to be branched from one electrode of the storage capacitor 36. The pixel electrodes 37 are connected to the other terminal of the storage capacitor 36, and the common electrodes 35・ It is arranged between 35 and 35. A horizontal electric field is applied to the liquid crystal between the common electrodes 35, 35 and the pixel electrodes 37, 37. According to the above configuration, the pixel is substantially divided into two regions by the common electrode 35.

[0006]

In the above liquid crystal display device, the thin film transistor element 31 (TFT:
The pixel electrode 37 and the common electrode 35 are formed on a substrate on which a Thin Film Transistor (hereinafter, referred to as TFT) is formed, but the pixel electrode 37 and the common electrode 35 are short-circuited due to a defect generated in the manufacturing process. Sometimes.
In that case, no electric field is applied to the liquid crystal. Therefore, when dark display is set to be performed when no electric field is applied to the liquid crystal, the defective portion becomes a black spot defect, deteriorating the display quality.

An object of the present invention is to correct a defect such as a short circuit between a pixel electrode and a common electrode in a method for manufacturing an IPS mode liquid crystal display device, and to correct the defect.
It is to minimize the loss of display quality.

[0008]

According to a first aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising: two insulating substrates disposed opposite to each other; A liquid crystal sandwiched between insulating substrates, a gate signal line and a source signal line provided at right angles to one of the insulating substrates, a gate signal line connected to the gate electrode, and a source signal line connected to the source electrode. A plurality of switching elements,
A pixel electrode connected to the drain electrode of the switching element, and a pixel electrode formed on the same insulating substrate as the pixel electrode, between the pixel electrode and a direction parallel to a surface of the insulating substrate with respect to the liquid crystal. And a counter electrode for applying an electric field to the liquid crystal display device, wherein at least one of the pixel electrode and the counter electrode has a branched shape, and a short-circuit defect occurs between the pixel electrode and the counter electrode. When the occurrence of a short circuit occurs, a branch portion relating to the short-circuit defect is cut off.

According to the above-described method, when a short-circuit defect occurs between the pixel electrode and the counter electrode, the branch portion of the pixel electrode or the counter electrode related to the short-circuit defect is cut.
A display operation can be performed in a region other than the display region relating to the cut pixel electrode or the counter electrode. Therefore,
The loss of display quality can be minimized, and the yield can be improved.

According to a second aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device according to the first aspect, wherein the liquid crystal is set to display a dark image when no electric field is applied.

According to the above-described method, a dark area is displayed without applying an electric field to the display area related to the cut pixel electrode or the counter electrode. Therefore, a display area to which the electric field is not applied is more than a bright area. It is much less noticeable, and the loss of display quality can be further reduced.

According to a third aspect of the present invention, in the method for manufacturing a liquid crystal display device according to the first aspect, the additional capacitance line connected to the counter electrode is formed in a matrix by the gate signal line and the source signal line. The plurality of opposed electrodes are arranged near the center of each of the pixels, and the plurality of opposed electrodes are vertically branched from the additional capacitance wiring and formed on both sides of the additional capacitance wiring.

According to the above method, since the counter electrode is vertically branched from the additional capacitance wiring arranged near the center of the pixel, this pixel is first divided into two parts by the additional capacitance wiring and divided into two parts. Each of the divided regions is further divided by opposing electrodes provided on both sides of the additional capacitance wiring. Accordingly, even when the length of the side of the pixel formed in a matrix is relatively small, the pixel can be substantially divided into a plurality of regions without extremely reducing the width of the pixel electrode and the counter electrode. Therefore, the non-defective rate can be increased.

According to a fourth aspect of the present invention, in the method of the first aspect, each of the pixels formed in a matrix by the gate signal line and the source signal line is connected to the pixel electrode or the opposite electrode. It is characterized by being substantially divided into four or more regions by electrodes.

According to the above-described method, if the short-circuit defect occurs at one location in the divided region, the short-circuit defect occurs when the branch portion of the pixel electrode or the counter electrode related to the short-circuit defect is cut. Since the ratio of the region other than the divided region is 75% or more, the pixel on which the short-circuit defect has occurred can be made almost inconspicuous on the actual display screen. Therefore, loss of display quality can be minimized,
Yield can be improved.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device according to the first aspect, wherein a counter electrode or a counter electrode close to the periphery of each pixel formed in a matrix by the gate signal line and the source signal line. When a short-circuit defect occurs between the pixel electrode and the pixel electrode or the counter electrode disposed inside the pixel electrode, the counter electrode or the pixel electrode closer to the periphery of the pixel is cut off. I have.

According to the above method, when a short-circuit defect occurs between a counter electrode or a pixel electrode located close to the periphery of the pixel and a pixel electrode or a counter electrode disposed inside the pixel, Since the counter electrode or the pixel electrode closer to the periphery is cut off, the region where display is impossible is only the region between the counter electrode where the short-circuit defect has occurred and the pixel electrode. When the pixel electrode or the counter electrode disposed inside the above is cut, the area between the pixel electrode or the counter electrode or the pixel electrode on both sides of the counter electrode cannot be displayed. By cutting the counter electrode or the pixel electrode closer to the periphery of the pixel, the area of the displayable region can be further increased. Therefore, the loss of display quality can be further reduced, and the yield can be further improved.

According to a sixth aspect of the present invention, there is provided a liquid crystal display device comprising: two insulating substrates arranged to face each other; a liquid crystal sandwiched between the two insulating substrates; and one of the insulating substrates. A gate signal line and a source signal line formed orthogonal to each other, a plurality of switching elements having a gate electrode connected to the gate signal line and a source electrode connected to the source signal line, and a drain electrode of the switching element. A plurality of pixel electrodes and a plurality of opposed electrodes formed on the same insulating substrate as the pixel electrodes and applying an electric field to the liquid crystal in a direction parallel to a surface of the insulating substrate between the pixel electrodes. An electrode, and each pixel formed in a matrix by the gate signal line and the source signal line is substantially divided into four or more regions by the pixel electrode or the counter electrode. It is characterized.

According to the above configuration, a short-circuit defect occurs between the pixel electrode and the counter electrode, and when the short-circuit defect is corrected by cutting the pixel electrode or the counter electrode related to the short-circuit defect, Since the area is roughly divided into four or more areas by the pixel electrode or the counter electrode, a display operation can be performed in an area other than the divided area where the short-circuit defect has occurred. Therefore, even if the short-circuit defect as described above occurs, loss of display quality can be minimized by the above-described correction.

According to a seventh aspect of the present invention, there is provided a liquid crystal display device.
In the configuration described above, an additional capacitance line connected to the opposite electrode is disposed near the center of each pixel, and the plurality of opposite electrodes branch off from the additional capacitance line and are formed on both sides of the additional capacitance line. It is characterized by having.

According to the above arrangement, since the counter electrode is vertically branched from the additional capacitance wiring disposed near the center of the pixel, this pixel is first divided into two parts by the additional capacitance wiring, and is divided into two parts. Each of the divided regions is further divided by opposing electrodes provided on both sides of the additional capacitance wiring. Accordingly, even when the length of the side of the pixel formed in a matrix is relatively small, the pixel can be substantially divided into a plurality of regions without extremely reducing the width of the pixel electrode and the counter electrode. Therefore, the non-defective rate can be increased.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS.

FIG. 3 is a circuit diagram schematically showing an active matrix substrate in the liquid crystal display device according to the embodiment of the present invention. Since the gate signal lines 4 and the source signal lines 5 are orthogonal to each other, pixels are formed in a matrix, and each pixel includes a TFT (switching element) 1, a liquid crystal capacitor 2, and an additional capacitor 3. Each TFT1 ...
Are connected to the gate electrodes of the TFTs, and each of the TFTs 1 is driven by a scanning signal from the scanning signal generating circuit 7. Source signal lines 5 are connected to the source electrodes of the TFTs 1, and data signals from the data signal generation circuit 8 are input to the TFTs 1. The liquid crystal capacitor 2 and the additional capacitor 3 are connected to the drain electrode of the TFT 1 and the additional capacitor
And are connected in parallel.

FIG. 4 is a view showing the TF in the liquid crystal display device.
It is sectional drawing which shows schematic structure of the part in which T1 was formed. A first substrate 24 and a second substrate 24 on which the TFT 1 is formed;
And the substrate 25 are arranged to face each other with the liquid crystal 23 interposed therebetween.

The first substrate 24 includes a transparent insulating substrate 9 and
An alignment film 16 formed on the surface of the transparent insulating substrate 9 on the liquid crystal 23 side.

The second substrate 25 has the following configuration. A gate electrode 10 made of a metal layer is formed on the surface of the transparent insulating substrate 9 on the liquid crystal 23 side.
A gate insulating film 11 is formed so as to cover the gate electrode 10 and the transparent insulating substrate 9. A semiconductor layer 12 is formed further above the gate insulating film 11 above the gate electrode 10.
In the region extending from the upper surface to the side surface, a source electrode 13 and a drain electrode 14 made of an n ⁺ -type _Si layer are formed in pairs so as not to contact each other. The source signal line 5 made of a metal layer is formed in contact with the source electrode 13, and the pixel electrode 18 made of a metal layer is formed in contact with the drain electrode 14. The above-mentioned source signal line, source electrode 13, semiconductor layer 12, drain electrode 1
4, and an interlayer insulating film 17 is formed so as to cover the pixel electrode 18, and an alignment film 16 is formed on the interlayer insulating film 17. Note that a planarization layer may be provided between the interlayer insulating film 17 and the alignment film 16.

The above-mentioned gate electrode 10 and gate insulating film 1
1, the semiconductor layer 12, the source electrode 13, and the drain electrode 14 form the TFT1.

FIG. 2 is a plan view of a unit pixel on the active matrix substrate. A gate signal line 4 is connected to a gate electrode of the TFT 1. The unit pixel corresponds to a region surrounded by adjacent gate signal lines 4.4 and adjacent source signal lines 5.5. Further, this unit pixel has a rectangular shape, and the side composed of the source signal lines 5.5 is longer than the side composed of the gate signal lines 4.4.

From the drain electrode of the TFT 1, pixel electrodes 18 are formed in a state of extending in the longitudinal direction of the unit pixel, and in the vicinity of the center with respect to the longitudinal direction, the pixel electrodes 18 are connected so that the pixel electrodes 18 are connected to each other. One electrode of the additional capacitor 3 is formed so as to extend in a direction perpendicular to the direction. The other electrode of the additional capacitance 3 is formed on the additional capacitance wiring 6 via an insulator so as to overlap in FIG. The additional capacitance wiring 6 is formed near the center of the unit pixel in the longitudinal direction so as to extend in a direction perpendicular to the longitudinal direction. Further, between the pixel electrodes 18 and between the source electrode 5 and the pixel electrode 18, the counter electrodes 19 are formed so as to extend in the longitudinal direction of the unit pixel, branching from the additional capacitance wiring 6. ing. According to the above configuration, the unit pixel is substantially divided into four regions by the counter electrodes 19.

When a potential difference occurs between the pixel electrode 18 and the counter electrode 19, an electric field is applied to the liquid crystal in a direction parallel to the substrate surface, and a display operation is performed. Note that the liquid crystal capacitance 2 in FIG.
And a counter electrode 19 and liquid crystal.

Next, a method of correcting a pixel defect in the present embodiment will be described below with reference to FIG.
The two pixel electrodes 18 arranged on the side opposite to the TFT 1 with respect to the additional capacitance 3 are referred to as pixel electrodes 18a and 18b from the right in FIG. The pixel electrodes 18 are referred to as pixel electrodes 18c and 18d from the left in FIG. In addition, additional capacity 3
In FIG. 1, three opposing electrodes 19a, 1a are arranged from the right side in FIG.
9b and 19c, and the three opposing electrodes 19 arranged on the TFT1 side with respect to the additional capacitor 3
9d, 19e, and 19f.

During the manufacture of the active matrix substrate described above, foreign matter 20 is mixed into the pixel electrode 18a and the counter electrode 19.
When a short-circuit defect occurs with the pixel b, no electric field is applied to the liquid crystal in this pixel. Therefore, in the case of a display method in which dark display is performed when no electric field is applied to the liquid crystal, the pixel in which the short-circuit defect as described above has occurred is
Display becomes impossible in the whole area of the pixel, resulting in a black spot defect.

In order to correct the above-mentioned defect, at the cutting point 21 located on the side of the additional capacitor 3 from the short-circuit defect portion,
The pixel electrode 18a is cut using a laser. As a result, while no voltage is applied to the region between the pixel electrode 18a and the counter electrode 19b and the region between the pixel electrode 18a and the counter electrode 19a, the dark display is maintained. Since the original signal voltage can be applied to 18b, 18c, and 18d, display is possible in areas other than the dark display area.

In other words, before the correction, the defective pixel was not able to be displayed in the entire area, that is, it was a complete black spot.
A part thereof cannot be displayed, that is, becomes a partial black spot. FIG.
In the case of a pixel having a configuration as shown in FIG. 1, according to the above-described correction, a normal display operation can be performed in a region corresponding to an area of about three quarters of the area of the defective pixel. In an experiment on the luminance of a pixel, if the luminance of a specific pixel is about 75% of that of a normal pixel, a result that the black spot defect cannot be recognized on a normal screen is obtained. Thus, it can be said that the defective pixel corrected above is almost inconspicuous on an actual display screen.

Therefore, although the degree of repair is limited for a defect large enough to extend over a plurality of divided regions of a pixel, a defect in a partial region of a pixel as shown in FIG. A sufficient effect can be obtained by the above modification.

In the unit pixel according to the present embodiment, the pixel electrode 18c on the TFT 1 side with respect to the additional capacitor 3
18d is connected to the drain electrode of TFT1. With this configuration, the pixel electrode 18c or 1
When the short-circuit defect relating to 8d occurs, even if the pixel electrode 18c or 18d on which the short-circuit defect occurs is cut, the other pixel electrode 18d or 18c is connected to the additional capacitor 3 and the pixel electrode 18a or 18b. An electric charge can be supplied. Therefore, even in such a case, the non-displayable area can be minimized by performing the correction by cutting the pixel electrode 18c or 18d.

The effect of the above-described correction depends on the number of divided regions substantially divided by the counter electrodes 19 in the unit pixel. For example, in the configuration of the unit pixel as shown in FIG. 7 in the related art, there are two divided areas, and when such a pixel is corrected as described above, the display after the correction is possible. The area is about 2 of the display area of the non-defective pixel.
This is one-half the area. In this case, the effect of the correction is insufficient compared with the case of the present embodiment in which the displayable area after the correction has an area of about three quarters of the display area of the non-defective pixel. That is, it can be said that the greater the number of divided regions in a unit pixel, the higher the effect of the above-described correction.

Although the above-described correction has been made by cutting the pixel electrode 18, the correction may be made by cutting the counter electrode 19. In this case, in FIG. 1, instead of the cutting point 21 of the pixel electrode 18a, a cutting point 2
At 2, the opposing electrode 19b is cut using a laser. As a result, no voltage is applied to a region between the counter electrode 19b and the pixel electrode 18a and a region between the counter electrode 19b and the pixel electrode 18b, so that dark display is maintained. 19a ・ 19c ・ 19d ・ 1
Since the original signal voltage can be applied to 9e and 19f, display is possible in areas other than the dark display area. That is, according to such a modification,
As in the case of cutting the pixel electrode 18a, a normal display operation can be performed in a region corresponding to an area of about three quarters of the area of the defective pixel.

For example, as shown in FIG. 5, the foreign matter 20 extends over the pixel electrode 18b and the counter electrode 19c.
Is mixed, resulting in a short circuit defect, the pixel electrode 18b
The displayable area is larger when the opposing electrode 19c is cut than when the counter electrode 19c is cut. This is because, when the pixel electrode 18b is cut, the non-displayable area is formed between the pixel electrode 18b and the counter electrode 1b.
9b, the pixel electrode 18b and the counter electrode 1
9c, the non-displayable area when the opposing electrode 19c is cut off is the opposing electrode 19c and the pixel electrode 18c.
This is because there is only the area between b. That is, when the pixel electrode 18b is cut, the displayable area is about three-quarters of the display area of the non-defective pixel.
When c is cut, the displayable area is about 7/8 of the display area of the non-defective pixel.

That is, in the unit pixel, the pixel electrode 1
8 and the outermost electrode with respect to the direction in which the opposing electrodes 19 extend, in this case the opposing electrodes 19a, 1
If a short-circuit defect occurs between 9c, 19d, 19f and the pixel electrode 18 adjacent to each other, cutting the opposing electrode side can make the displayable area wider.

As described above, in the unit pixel, the additional capacitance 3 is arranged near the center in the longitudinal direction, and the opposing electrodes 19 and the pixel electrodes 18 are branched from the additional capacitance 3 on both sides.
Are formed, the number of divided regions substantially divided by the opposing electrodes 19 becomes four. When a short-circuit defect occurs between the counter electrode 19 and the pixel electrode 18 in such a pixel, by cutting the counter electrode 19 or the pixel electrode 18, it is possible to minimize a region where display is impossible. it can. Therefore, the display quality can be improved, and the yield can be improved.

It is to be noted that, when the corrected divided area becomes a black display, the divided area becomes much less noticeable than the bright display, so that the display becomes dark when no electric field is applied to the liquid crystal. In the method, the effect of the above-described correction is higher.

Embodiment 2 Another embodiment of the present invention will be described below with reference to FIG. The components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 6 is a plan view of a unit pixel on the active matrix substrate. The additional capacitance line 6 and the additional capacitance 3 extend in a direction perpendicular to the longitudinal direction at a position close to the gate signal line 4 other than the gate signal line 4 where the TFT 1 is formed in the unit pixel. The five opposing electrodes 19 are formed so as to branch off from the additional capacitance line 6 and extend in the longitudinal direction of the pixel.
Further, the four pixel electrodes 1 are located between the adjacent opposing electrodes 19.
8 are formed so as to be connected to the drain electrode of the TFT 1 and the electrode of the additional capacitor 3. According to the above configuration, the unit pixel is substantially divided into four divided regions by the counter electrodes 19.

When a short circuit defect occurs between the pixel electrode 18 and the counter electrode 19 in the unit pixel having the above structure,
Similarly to the correction method in the first embodiment, by cutting either the pixel electrode 18 or the counter electrode 19, the non-displayable area can be minimized.

Further, in the unit pixel, the electrode located closest to the periphery of the pixel, that is, in the above case, the two opposing electrodes 19, 19 which are closest to the source signal lines 5.5.
In this case, when a short-circuit defect occurs between the pixel electrodes 18 adjacent to each other, cutting the opposing electrode side can make the displayable area wider. In the above case, if the opposing electrode side is cut, the displayable area is
The area is about 7/8 of the display area of the non-defective pixel. When the pixel electrode side is cut in the same case as above, and when a short-circuit defect occurs in a place other than the above case, the displayable area is about three-quarters of the display area of the non-defective pixel. Becomes

When the number of the pixel electrodes 18 and the counter electrodes 19 between the widths in the longitudinal direction of the unit pixel is increased as in the configuration of the unit pixel in the present embodiment, the width in the longitudinal direction (unit) When the width of the short side of the pixel is small, for example, when the width in the longitudinal direction is about 100 μm, each pixel electrode 18.
... the width of itself or the distance between the pixel electrode 18 and the counter electrode 19 becomes too small. In this case, problems such as an increase in short-circuit defects and the like occur due to the limit of machining accuracy in manufacturing. If the length of the short side is 200 μm or more, the unit pixel is moved in the short side direction by 4 as in the present embodiment.
There is no problem with the divided configuration.

As described above, the additional capacitance 3 is arranged close to the gate signal line 4 other than the gate signal line 4 on which the TFT 1 in the unit pixel is formed, and branched from the additional capacitance 3 to one side. By forming the counter electrodes 19 and the pixel electrodes 18 in this manner, the number of divided regions substantially divided by the counter electrodes 19 becomes four. When a short-circuit defect occurs between the counter electrode 19 and the pixel electrode 18 in such a pixel, by cutting the counter electrode 19 or the pixel electrode 18, it is possible to minimize a region where display is impossible. it can. Therefore, the display quality can be improved, and the yield can be improved.

The manufacturing method of the liquid crystal display device is as follows.
An additional capacitance line connected to the counter electrode is arranged near the periphery of each pixel formed in a matrix by the gate signal line and the source signal line, and the plurality of counter electrodes branch off from the additional capacitance line. Thus, it may be formed on one side of the additional capacitance wiring.

[0050]

As described above, the method for manufacturing a liquid crystal display device according to the first aspect of the present invention provides a method for manufacturing a liquid crystal display device, comprising the steps of: A liquid crystal to be sandwiched, a gate signal line and a source signal line provided orthogonal to each other on one of the insulating substrates, a plurality of switching elements in which a gate signal line is connected to a gate electrode, and a source signal line is connected to a source electrode. A pixel electrode connected to the drain electrode of the switching element, and formed on the same insulating substrate as the pixel electrode, between the pixel electrode and the liquid crystal parallel to the surface of the insulating substrate. A method of manufacturing a liquid crystal display device comprising: a counter electrode for applying an electric field in a direction, wherein at least one of the pixel electrode and the counter electrode has a branched shape, and a short circuit occurs between the pixel electrode and the counter electrode. Defects When the Flip to cut the branch portion related to the short-circuit defect.

Thus, when a short-circuit defect occurs between the pixel electrode and the counter electrode, a display operation can be performed in a region other than the display region related to the pixel electrode or the counter electrode in which the short-circuit defect has occurred. This has the effect. Therefore, loss of display quality can be minimized,
This has the effect of improving the yield.

In the method of manufacturing a liquid crystal display device according to the second aspect of the present invention, the liquid crystal is set so as to display a dark image when no electric field is applied.

Thus, in addition to the effect of the method of the first aspect, since a dark area is displayed without applying an electric field to the display area relating to the cut pixel electrode or the counter electrode, the display area is not a bright display area. The display area relating to the cut pixel electrode or the counter electrode is much less noticeable, and the effect of further reducing the loss of display quality can be achieved.

According to a third aspect of the present invention, in the method of manufacturing a liquid crystal display device, the additional capacitance line connected to the counter electrode is formed at the center of each pixel formed in a matrix by the gate signal line and the source signal line. The plurality of opposing electrodes are disposed in the vicinity, and are formed on both sides of the additional capacitance wiring by branching vertically from the additional capacitance wiring.

Thus, in addition to the effect of the method of the first aspect, the width of the pixel electrode and the counter electrode is not extremely reduced even when the length of the side of the pixel formed in a matrix is relatively small. In addition, it is possible to substantially divide the pixel into a plurality of regions, and it is possible to increase the yield rate.

According to a fourth aspect of the present invention, in the method of manufacturing a liquid crystal display device, four or more pixels formed in a matrix by the gate signal lines and the source signal lines are formed by the pixel electrodes or the counter electrodes. It is roughly divided into regions.

According to this, in addition to the effect of the method according to the first aspect, when the branch portion of the pixel electrode or the counter electrode related to the short-circuit defect is cut, if the short-circuit defect occurs in one place, the short-circuit is prevented. Since the ratio of the region other than the divided region where the defect has occurred is 75% or more, the pixel on which the short-circuit defect has occurred can be made almost inconspicuous on the actual display screen, and loss of display quality can be minimized. It has the effect that it can be done.

According to a fifth aspect of the invention, there is provided a method of manufacturing a liquid crystal display device, comprising: a counter electrode or a pixel electrode which is formed in a matrix by the gate signal lines and the source signal lines; If a short-circuit defect occurs between the pixel electrode and the counter electrode arranged in the pixel, the counter electrode or the pixel electrode that is closer to the periphery of the pixel is cut off.

Thus, in addition to the effect of the method according to the first aspect, a short-circuit defect occurs between the counter electrode or the pixel electrode close to the periphery of the pixel and the pixel electrode or the counter electrode disposed inside the pixel. If this occurs, the area that cannot be displayed is only the area between the counter electrode and the pixel electrode where the short-circuit defect has occurred, so that the area of the displayable area can be increased and the loss of display quality can be further reduced. This has the effect of being able to reduce.

According to a sixth aspect of the present invention, there is provided a liquid crystal display device, comprising: two insulating substrates disposed to face each other; a liquid crystal sandwiched between the two insulating substrates; A gate signal line and a source signal line formed orthogonal to each other, a plurality of switching elements having a gate electrode connected to the gate signal line and a source electrode connected to the source signal line, and a drain connected to the switching element. And a plurality of pixel electrodes formed on the same insulating substrate as the pixel electrodes and applying an electric field to the liquid crystal in a direction parallel to a surface of the insulating substrate between the pixel electrodes. Each pixel formed in a matrix by the gate signal line and the source signal line is substantially divided into four or more regions by the pixel electrode or the counter electrode. It is a configuration.

As a result, a short-circuit defect occurs between the pixel electrode and the counter electrode. When the short-circuit defect is corrected by cutting the pixel electrode or the counter electrode involved in the short-circuit defect, the short-circuit defect occurs. In regions other than the divided regions, an effect that a display operation can be performed is achieved.
Therefore, even if the short-circuit defect as described above occurs, there is an effect that loss of display quality can be minimized by the above-described correction.

According to a seventh aspect of the present invention, in the liquid crystal display device, the additional capacitance line connected to the opposite electrode is disposed near the center of each pixel, and the plurality of opposite electrodes branch off from the additional capacitance line. This is a configuration formed on both sides of the additional capacitance wiring.

Thus, in addition to the effect of the structure of claim 6, even when the length of the side of the pixel formed in a matrix is relatively small, the width of the pixel electrode and the counter electrode is not extremely reduced. In addition, it is possible to substantially divide the pixel into a plurality of regions, and it is possible to increase the yield rate.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration when a short-circuit defect occurs in a unit pixel in a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a schematic configuration of the unit pixel.

FIG. 3 is a circuit diagram illustrating a schematic configuration of the liquid crystal display device.

FIG. 4 is a cross-sectional view illustrating a configuration of a TFT in the unit pixel.

FIG. 5 is a plan view showing another schematic configuration when a short-circuit defect occurs in the unit pixel.

FIG. 6 is a plan view illustrating a schematic configuration of a unit pixel in a liquid crystal display device according to another embodiment of the present invention.

FIG. 7 is a plan view illustrating a schematic configuration of a unit pixel in a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 TFT (switching element) 3 Additional capacitance 4 Gate signal line 5 Source signal line 6 Additional capacitance wiring 18 Pixel electrode 19 Counter electrode

Claims (7)

[Claims] 1. An insulating substrate disposed opposite to each other, a liquid crystal interposed between the two insulating substrates, and a gate provided on one of the insulating substrates at right angles to each other. A plurality of switching elements each having a signal line and a source signal line, a gate signal line connected to a gate electrode, and a source signal line connected to a source electrode; a pixel electrode connected to a drain electrode of the switching element; And a counter electrode for applying an electric field to the liquid crystal in a direction parallel to the surface of the insulating substrate between the pixel electrode and the pixel electrode. Wherein at least one of the pixel electrode and the counter electrode has a branched shape, and when a short-circuit defect occurs between the pixel electrode and the counter electrode, a branch portion related to the short-circuit defect is cut. Method of manufacturing a liquid crystal display device which. 2. The method for manufacturing a liquid crystal display device according to claim 1, wherein the liquid crystal is set so as to display a dark image when no electric field is applied. 3. An additional capacitance line connected to the counter electrode is arranged near the center of each pixel formed in a matrix by the gate signal line and the source signal line, and the plurality of counter electrodes are connected to the additional electrode. 2. The method of manufacturing a liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed on both sides of the additional capacitance line by vertically branching off from the capacitance line. 4. Each pixel formed in a matrix by said gate signal line and said source signal line is substantially divided into four or more regions by said pixel electrode or said counter electrode. Item 2. The method for manufacturing a liquid crystal display device according to Item 1. 5. A method according to claim 1, wherein said gate signal line and said source signal line are arranged in a matrix between a counter electrode or a pixel electrode close to the periphery of each pixel and a pixel electrode or a counter electrode disposed inside said counter electrode or pixel electrode. 2. If a short-circuit defect occurs in the step (b), a counter electrode or a pixel electrode closer to the periphery of the pixel is cut off.
The manufacturing method of the liquid crystal display device according to the above. 6. An insulating substrate, comprising: two insulating substrates disposed opposite to each other; a liquid crystal sandwiched between the two insulating substrates; and one formed on one of the insulating substrates so as to be orthogonal to each other. A gate signal line and a source signal line; a plurality of switching elements having a gate electrode connected to the gate signal line and a source electrode having a source signal line connected thereto; a plurality of pixel electrodes connected to a drain electrode of the switching element; A plurality of opposing electrodes formed on the same insulating substrate as the electrodes and applying an electric field to the liquid crystal in a direction parallel to a surface of the insulating substrate, between the pixel electrodes; A liquid crystal display device wherein each pixel formed in a matrix by a signal line and the source signal line is substantially divided into four or more regions by the pixel electrode or the counter electrode. 7. An additional capacitance line connected to the counter electrode is arranged near the center of each pixel, and the plurality of counter electrodes branch off from the additional capacitance line and are formed on both sides of the additional capacitance line. 7. The liquid crystal display device according to claim 6, wherein: