JP2010060590A - Liquid crystal display device - Google Patents

Abstract

In a liquid crystal display device in which lead lines around a display portion have a multi-layer structure, a liquid crystal display capable of achieving a narrower frame by re-examining the arrangement of a connecting wiring portion between a scanning line and a source wiring. To provide a display device.
A frame region PF in the periphery of the display region includes a plurality of gate wirings 41 formed below the gate insulating film and a plurality of source wirings 42 formed on the gate insulating film,
A connection wiring portion 50 for electrical connection between the gate wiring 41 and the source wiring 42 is disposed in a notch portion 54 formed in the common wiring 40.
[Selection] Figure 4

Description

The present invention relates to a liquid crystal display device in which routing wiring is formed around a display area. More specifically, the present invention relates to a liquid crystal display device in which routing wirings are formed above and below an insulating film, and connection wirings formed above and below these insulating films are electrically connected to each other at a connection portion.

A liquid crystal display device has characteristics of light weight, thinness, and low power consumption as compared with a CRT (cathode ray tube), and thus is used in many electronic devices for display.

As a method for applying an electric field to a liquid crystal layer of a liquid crystal display device, there are a vertical electric field method and a horizontal electric field method. A vertical electric field type liquid crystal display device applies a substantially electric field in a column direction to liquid crystal molecules by a pair of electrodes arranged with a liquid crystal layer interposed therebetween. As this vertical electric field type liquid crystal display device, TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, MV
An A (Multi-domain Vertical Alignment) mode or the like is known. In a horizontal electric field type liquid crystal display device, a pair of electrodes are insulated and provided only on one inner surface side of a pair of substrates disposed with a liquid crystal layer interposed therebetween, and a substantially horizontal electric field is applied to liquid crystal molecules. To be applied. This lateral electric field type liquid crystal display device has an IPS (In-Plane) in which a pair of electrodes do not overlap in a plan view.
Switching) mode and overlapping FFS (Fringe Field Switching) mode are known.

As described above, a plurality of types of liquid crystal display devices are known, all of which are aligned in a matrix with pixel electrodes and counter electrodes that form an electric field for changing the orientation of liquid crystal molecules. A scanning line and a signal line for changing the voltage of the pixel electrode are formed in the display area. In some display areas, auxiliary capacitance electrodes for holding a display electric field are formed for each pixel during one scanning period. Various voltages are applied from the non-display area to the common electrode, the scanning line, the signal line, and the auxiliary capacitance electrode formed in the display area.

In the non-display area of the array substrate, driver ICs and terminals for various connection with the outside are formed, and common electrodes, scanning lines, signal lines, and auxiliary capacitance electrodes are electrically connected to these terminals by lead wires. Has been. These lead wirings are formed around the display area (hereinafter referred to as “frame area”). Since there are a large number of wiring lines for scanning lines and signal lines, a wide frame area is required. In particular, when the driver IC and the source driver IC are integrated and arranged in the signal line extending direction, etc., the scanning line routing wiring is extended from the left and right sides of the display area in the signal line extending direction. It must be routed and a larger frame area is required. Therefore, as disclosed in Patent Document 1 below, when the scanning line routing wiring is routed in the extending direction of the signal line from both the left and right sides in order to reduce the area required for the frame area, the scanning line of the frame area is set. It was considered to have a multilayer (see Patent Document 1 below). The configuration of the frame region of the liquid crystal display device disclosed in Patent Document 1 below will be described with reference to FIG.

FIG. 8 is an enlarged plan view of a frame region of the liquid crystal display device disclosed in Patent Document 1 below.

In the liquid crystal display device 90, the odd-numbered scan lines 91A and the even-numbered scan lines 91A.
Both B are formed under the gate insulating film. The odd-numbered scanning lines 91A are directly connected to the gate routing lines 92 formed below the gate insulating film. The even-numbered scanning lines 91 </ b> B are switched and connected to the source lead-out wiring 94 formed on the surface of the gate insulating film via the first contact hole 95 formed in the gate insulating film. Thus, since the gate lead-out wiring 92 and the source lead-out wiring 94 are stacked on each other via the gate insulating film, the area occupied by the frame region can be reduced. In the liquid crystal display device 90 shown in FIG. 8, both the odd-numbered scanning lines 91A and the even-numbered scanning lines 91B both have electrostatic breakdown preventing elements through contact holes 95 formed in the gate insulating film. An example in which the other terminal of the electrostatic breakdown preventing element 96 is electrically connected to a common wiring (short-circuit wiring) 97 is shown.
JP 2006-220832 A

However, in the liquid crystal display device 90 disclosed in Patent Document 1, the contact hole 95 is used for switching the wiring between the scanning line 91B of the even-numbered row and the source routing wiring 94.
Are formed between the common wiring 97, the gate routing wiring 92, and the source routing wiring 94. Therefore, the common wiring 97, the gate routing wiring 92, and the source routing wiring 94 are arranged.
Therefore, it has been difficult to meet the demand for a narrower frame with the recent miniaturization and higher definition of liquid crystal display devices.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a switching unit between a scanning line and a source wiring in a liquid crystal display device in which a lead line around the display unit has a multilayer structure. It is an object of the present invention to provide a liquid crystal display device that can achieve a narrower frame by reviewing the arrangement.

In order to achieve the above object, a liquid crystal display device of the present invention includes a pair of transparent substrates sandwiching a liquid crystal layer, and the first liquid crystal layer side of the pair of transparent substrates has a first display region. A plurality of scanning lines and signal lines formed in a matrix with an insulating film interposed therebetween, a switching element provided near an intersection of the plurality of scanning lines and signal lines, the switching element, the signal lines, and the exposed A second insulating film that covers the surface of the first insulating film, and a pixel electrode that is formed for each of the areas partitioned by the plurality of scanning lines and signal lines. A plurality of first wirings formed below the first insulating film; a plurality of second wirings formed between the first insulating film and the second insulating film; and a lower part or an upper part of the first insulating film. A common wiring formed on the scanning line, the scanning line, and the second wiring. A liquid crystal display device including a first connection portion that electrically connects the notches, wherein the common wiring has a cutout portion, and the first connection portion is formed in the cutout portion. It is characterized by that.

In the liquid crystal display device of the present invention, the first connection portion that electrically connects the scanning line and the second wiring is formed in the cutout portion of the common wiring. It can be prevented from protruding from the common wiring. Therefore, according to the liquid crystal display device of the present invention,
Since it is not necessary to provide an extra area for forming the first connection portion in the frame area, a narrow frame liquid crystal display device can be obtained. In addition, the common wiring is originally formed wide to reduce the resistance. If the width of the common wiring in the portion where the notch is formed is 50 μm or more, the common wiring due to the formation of the notch is formed. The problem of increased resistance does not occur.

As the first insulating film and the second insulating film, an inorganic insulating film such as silicon oxide or silicon nitride is used, but silicon nitride is desirable from the viewpoint of insulation. At least the pixel electrode is made of a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). Furthermore, as a switching element that can be used in the liquid crystal display device of the present invention, a thin film transistor (TF) using amorphous silicon as a semiconductor material.
T: Thin Film Transistor, TFT using polysilicon, Low temperature polysilicon (LT)
PS: Low Temperature Poly Silicon (TFT), Thin Film Diode TFD (Thin Film Diod)
e) etc. can be used.

In the liquid crystal display device of the present invention, it is preferable that the first wiring is formed of the same material as the scanning line, and the second wiring is formed of the same material as the signal line.

In the liquid crystal display device of the present invention, the first wiring and the scanning line are both formed below the first insulating film, and the second wiring and the signal line are both formed on the surface of the first insulating film. Therefore, the first
If the wiring and the scanning line are formed of the same material, and the second wiring and the signal line are formed of the same material, the first
The wiring and the scanning line can be formed at the same time, and the second wiring and the signal line can be formed at the same time. Therefore, according to the liquid crystal display device of the present invention, the manufacture becomes easy, and it is not necessary to increase the number of manufacturing steps particularly for forming the first wiring or the second wiring.

In the liquid crystal display device of the present invention, the first connection portion includes a first contact hole formed in the first insulating film and the second insulating film on the first wiring, and a second contact on the second wiring. It is preferably formed by connecting in a bridge shape with a transparent conductive material through a second contact hole formed in the insulating film.

A pixel electrode made of at least a transparent conductive material is formed on the side where the switching element of the liquid crystal display device is formed. According to the liquid crystal display device of the present invention, since the switching wiring between the scanning line and the second wiring in the first connection portion can be formed at the same time when the pixel electrode is formed, the manufacturing is facilitated. There is no need to increase the number of manufacturing steps for forming.

In the liquid crystal display device of the present invention, the display region is provided with auxiliary capacitance lines in the same layer as the plurality of scanning lines, and the common wiring is formed on the surface of the first insulating film. It is preferable that a second connection portion for electrically connecting the auxiliary capacitance line and the common wiring is formed on the side opposite to the first connection portion with the common wiring interposed therebetween.

In the vertical electric field type liquid crystal display device and the IPS mode liquid crystal display device, an auxiliary capacitance electrode and an auxiliary capacitance line connected to the auxiliary capacitance electrode are formed in the same layer as the scanning line for each sub-pixel.
The auxiliary capacitance line is formed in parallel with the scanning line and is electrically connected to the common wiring outside the display area. In the liquid crystal display device of the present invention, the second connection portion that electrically connects the auxiliary capacitance line and the common wiring is formed on the side opposite to the first connection portion with the common wiring interposed therebetween. It is said. Therefore, according to the liquid crystal display device of the present invention, the first connection portion and the second connection portion do not interfere with each other, and the width of the common wiring is reduced by the notch portion for arranging the first connection portion. It can be compensated by the area of the connecting portion, and a vertical electric field type liquid crystal display device and an IPS mode liquid crystal display device with a narrowed frame can be obtained.

In the liquid crystal display device of the present invention, an interlayer film is formed in the display region, and each region partitioned by a lower electrode and the plurality of scanning lines and signal lines via an insulating film on the interlayer film. An upper electrode having a plurality of slits formed therein, and one of the lower electrode and the upper electrode is electrically connected to the switching element to be a pixel electrode, and the other of the lower electrode and the upper electrode is The second connection portion that is electrically connected to the common wiring to be a common electrode, and is electrically connected between the common electrode and the common wiring, is opposite to the first connection portion with the common wiring interposed therebetween. It is preferable to be formed.

In the liquid crystal display device of the present invention, an upper electrode having a plurality of slits formed in each region partitioned by a lower electrode and a plurality of scanning lines and signal lines is formed on an interlayer film via an insulating film. One of the electrode and the upper electrode is electrically connected to the switching element to be a pixel electrode, and the other of the lower electrode and the upper electrode is electrically connected to a common wiring to be a common electrode. Therefore, the liquid crystal display device of the present invention operates as an FFS mode liquid crystal display device. In the liquid crystal display device of the present invention, the second connection portion for electrically connecting the upper electrode or the lower electrode on the side that operates as the common electrode and the common wiring is connected to the first connection across the common wiring. It is assumed that it is formed on the opposite side to the part. Therefore, according to the liquid crystal display device of the present invention, the first connection portion and the second connection portion do not interfere with each other, and the width of the common wiring is reduced by the notch portion for arranging the first connection portion. It can be compensated by the area of the connection part,
An FFS mode liquid crystal display device with a narrow frame is obtained.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal display device for embodying the technical idea of the present invention, and is not intended to identify the present invention as this liquid crystal display device. Other embodiments within the scope of the claims are equally applicable. In each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions.

FIG. 1 is a schematic plan view showing an array substrate of the liquid crystal display device of the first embodiment. FIG. 2 shows the first
It is a top view for 1 sub pixel of the liquid crystal display device which concerns on embodiment. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an enlarged plan view of a portion IV in FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a partially enlarged plan view of a frame region of the liquid crystal display device of the second embodiment.

[First Embodiment]
A liquid crystal display panel 10A according to the first embodiment will be described with reference to FIGS. As shown in FIG. 3, the liquid crystal display panel 10 </ b> A according to the first embodiment sandwiches the liquid crystal layer 11 between the array substrate 12 and the color filter substrate 13. The thickness of the liquid crystal layer 11 is uniformly maintained by a columnar spacer (not shown). Further, the back surface of the array substrate 12 and the color filter substrate 1
A polarizing plate (not shown) is formed on each of the three front surfaces. Light is irradiated from the back side of the array substrate 12 by a backlight (not shown).

As shown in FIG. 1, the array substrate 12 includes a display area DA on which various images are displayed, and a frame area PF that is a periphery of the display area DA. A driver I is provided on one end side of the frame area PF.
A first terminal portion Dr for placing C and a second terminal portion TP for external connection are formed. In the frame area PF, the scanning line 19 (see FIG. 2) of the display area DA is connected to the first terminal portion Dr.
And a signal line routing wiring section 39 for routing the signal line 22 (see FIG. 2) to the first terminal section Dr. The detailed configuration of the scanning line routing wiring section 38 and the signal line routing wiring section 39 will be described later. In the frame area PF,
A common wire 40 for routing the upper electrode 28 to the first terminal portion Dr and a short-circuit wire 47 (see FIG. 4) for routing the antistatic circuit 46 are also included.

First, the configuration of the array substrate 12 will be described. As shown in FIGS. 2 and 3, the array substrate 12 is disposed on the liquid crystal layer 11 side of the first substrate body 18 made of glass, quartz, plastic, or the like.
A plurality of scanning lines 19 are formed in parallel. The scanning line 19 is made of an opaque metal such as an aluminum metal, an aluminum alloy, or molybdenum, and extends in the X-axis direction in FIG. Further, when the scanning line 19 is formed, a plurality of gate wirings 41 (see FIG. 4) extending toward the first terminal portion Dr are formed in the scanning line routing wiring portion 38 of the frame region PF, and the signal line routing wiring portion. Similarly, a plurality of gate wirings (not shown) extending toward the first terminal portion Dr are formed at 39. A gate insulating film 20 is formed to cover the scanning lines 19, the gate wiring 41, and the exposed surfaces of the first substrate body 18. The gate insulating film 20 corresponds to the first insulating film of the present invention and is formed of an inorganic insulating film such as silicon oxide or silicon nitride.

A semiconductor layer 21 made of, for example, amorphous silicon is formed on the gate insulating film 20, and a source electrode S and a drain electrode D are formed so as to partially run over the semiconductor layer 21. The semiconductor layer 21 is disposed to face a portion branched from the scanning line 19 via the gate insulating film 20, and the portion branched from the scanning line 19 constitutes a gate electrode G of the TFT. The source electrode S consists of a portion branched from the signal line 22. The signal line 22 and the drain electrode D are each formed of an opaque metal such as an aluminum metal, an aluminum alloy, or molybdenum, and the signal line 22 extends in the Y-axis direction of FIG. In addition, when the signal line 22 is formed, a plurality of source wirings 42 extending toward the first terminal portion Dr are formed in the scanning line routing wiring portion 38 of the frame region PF, and the signal line routing wiring portion 39 includes Also the first
A source wiring (not shown) extending toward the terminal portion Dr is formed. In the present invention, “gate wiring” refers to a wiring portion formed under the gate insulating film 20, and “source wiring” refers to a wiring portion formed over the gate insulating film 20. Is shown.

A passivation film 23 made of an inorganic insulating film such as silicon oxide or silicon nitride is formed so as to cover the exposed portions of the semiconductor layer 21, the source electrode S, the drain electrode D, the signal line 22, the source wiring 42, and the gate insulating film 20. An interlayer film 24 made of a resin material is formed so as to cover the passivation film 23. This passivation film 23 corresponds to the second insulating film of the present invention. Further, as the interlayer film 24, a photosensitive or non-photosensitive resin material having good transparency and excellent electrical insulation can be appropriately selected and used. In order to cover the interlayer film 24, ITO, IZ
A lower electrode 25 made of a transparent conductive material such as O is formed. A contact hole 26 is formed so as to penetrate the passivation film 23 and the interlayer film 24 and reach the drain electrode D, and the lower electrode 25 and the drain electrode D are electrically connected via the first contact hole 26. ing. Therefore, the lower electrode 25 operates as a common electrode.

An interelectrode insulating film 27 made of an inorganic insulating film such as silicon oxide or silicon nitride is formed so as to cover the lower electrode 25. The inter-electrode insulating film 27 is formed under a film forming condition at a temperature lower than that of the passivation film 23 so that the surfaces of the lower electrode 25 and the interlayer film 24 are not roughened. Further, the surface of the lower electrode 25 and the interelectrode insulating film 27 on the liquid crystal layer 11 side is made of ITO or IZO.
An upper electrode 28 made of a transparent conductive material is formed. For example, as shown in FIG. 2, the upper electrode 28 is formed with slit-like openings 31 extending in different directions around the center in the column direction for each sub-pixel. The openings are “kaku”.
It is connected in a letter shape. A band-shaped electrode portion 32 is formed between the slit-shaped openings 31.

The slit-shaped opening 31 is formed by exposing and etching the upper electrode 28 by photolithography. A first alignment film 30 is formed on the surface of the upper electrode 28 and the inner surface of the slit-shaped opening 31, and the rubbing direction of the alignment film is directed from the formation state of the slit-shaped opening 31 to the extending direction of the scanning line 19. And slit-shaped opening 31 with respect to the rubbing direction
The extending direction is inclined from about 5 degrees to about 25 degrees. As a result, when an electric field is applied between the lower electrode 25 and the upper electrode 28, the liquid crystal molecules can rotate in different directions in the upper and lower regions in the center in the column direction. Viewing angle characteristics can be obtained. The shape of the slit-shaped opening 31 is not limited to the shape shown in FIG. 2, but may be entirely “<” shaped, and slit-shaped openings extending in different directions are connected. It does not have to be. Furthermore, the shape of the slit-shaped opening 31 is not only a vertical “<” shape along the signal line 22, but also a “<” shape in the vertical direction along the signal line 22. Alternatively, it may be a bar shape without a bent portion. In particular, in the case of a bar having no bent portion, it may be in a state of extending parallel or inclined along the scanning line 19 or may be in a state of extending parallel or inclined in the vertical direction along the signal line 22.

Next, the color filter substrate 13 will be described. The color filter substrate 13 has a second substrate body 33 made of glass, quartz, plastic, or the like.
A color filter layer 34 that transmits different colors of light (R, G, B, or colorless) for each sub-pixel.
A black matrix 35 is formed. A top coat layer 36 is formed so as to cover the color filter layer 34 and the black matrix 35, and a second alignment film 37 made of, for example, polyimide is formed so as to cover the top coat layer 36. And second
The alignment film 37 is rubbed in the direction opposite to that of the first alignment film 30.

Then, the array substrate 12 and the color filter substrate 13 formed as described above are arranged to face each other, the peripheral portion is sealed with a sealing material (not shown), and the liquid crystal layer 11 is placed between the array substrate 12 and the color filter substrate 13. The liquid crystal display panel 10A of the first embodiment is obtained by sealing in the sealed area formed in the above. In the liquid crystal display panel 10A of the first embodiment, the transmission axis of the polarizing plate on the array substrate 12 side and the transmission axis of the polarizing plate on the color filter substrate 13 side are arranged so as to be orthogonal to each other. The transmission axis of the 13th polarizing plate is arranged to be parallel to the Y axis of FIG. With such a configuration, the first
The rubbing direction of the alignment film 30 is a direction intersecting with the main direction of the electric field generated between the common electrode 28 and the pixel electrode 25. In the initial state, the liquid crystal aligned in parallel along the rubbing direction is rotated and reoriented to the main direction side of the electric field by applying a voltage between the common electrode 28 and the pixel electrode 25. Based on the difference between the initial alignment state and the alignment state at the time of voltage application, the light and dark display of each sub-pixel is performed.

Next, the main part of the frame region PF will be described with reference to FIGS. 1 and 4 to 6. here,
The common wiring 40 surrounds the periphery of the frame region PF so as to surround the gate insulating film 2 in the frame region PF.
It is formed on 0 with a predetermined width W (for example, a width of 50 μm or more). The common wiring 40 may be formed under the gate insulating film 20 in some cases. The upper electrode 28 is formed on the passivation film 23 across all the sub-pixels, and extends over the common wiring 40 in the frame region PF at a predetermined interval with a plurality of predetermined widths. 43 for common wiring 4
0 is electrically connected. The common connection portion 43 corresponds to the second connection portion in the present invention.

As shown in FIGS. 5 and 6, in the frame region PF, a plurality of gate wirings 41 are formed below the gate insulating film 20, and a plurality of source wirings 42 are formed on the gate insulating film 20. And are formed so as to overlap or alternate. Further, the gate insulating film 20
Common wiring 40 is also formed on the surface. Further, as shown in FIG. 4, an antistatic circuit 46 is formed between the common connection portions 43, and the short-circuit wiring 47, which is a lead wiring of the antistatic circuit 46, is the same as the extending direction of the signal line 22. It is formed on the gate insulating film 20 in the frame region PF in the direction. A passivation film 23 and an interelectrode insulating film 27 are laminated so as to cover the surfaces of the common wiring 40, the source wiring 42, the short-circuit wiring 47 and the gate insulating film 20.

In the common connection portion 43, the common wiring 40 has a common wiring 4 in order to reduce electric resistance.
It is directly electrically connected to the upper electrode 28 that operates as a common electrode through a plurality of common contact holes 44 formed in the passivation film 23 on the zero and the interelectrode insulating film 27. Further, in the connection wiring portion 50, the first contact hole 51 formed in the gate insulating film 20, the passivation film 23 and the interelectrode insulating film 27 on the gate wiring 41, and the passivation film 23 and the interelectrode insulation on the source wiring. Through the second contact hole 52 formed in the film 27, the gate wiring 41 and the source wiring 42 are bridge-connected by a conductive path 53 made of a transparent conductive material made of the same material as the upper electrode. In this case, the gate insulating film 20 corresponds to the first insulating film of the present invention, and the passivation film 23 and the interelectrode insulating film 27 correspond to the second insulating film of the present invention.

For example, the odd-numbered scanning lines 19 extend to the left of the frame area PF, and the even-numbered scanning lines 19 extend to the right side of the frame area PF. For example, in order to route the scanning line 19 extending to the right side to the driver first terminal portion Dr (see FIG. 1), the odd-numbered scanning line 19 on the right side is directly connected to the gate wiring 41 and the right side The even-numbered scanning lines 19 are connected to the source wirings 42 through the connection wiring parts 50, and the gate wirings 41 and the source wirings 42 connected to the adjacent scanning lines 19 are interposed via the gate insulating film 20. Are superimposed on each other or arranged alternately. Thereby, the area of the region occupied by the scanning line lead-out wiring portion 38 in the frame region PF can be reduced.

In the liquid crystal display device 10A of the first embodiment, as shown in FIG.
A cutout portion 54 is formed in a part of the cutout portion 54, and the connecting wiring portion 50 is located in the cutout portion 54. The cutout portion 54 is formed on the opposite side to the common connection portion 43 that is an electrical connection portion between the upper electrode 28 that operates as the common electrode and the common wiring 40 described above. If such a relationship is satisfied, the width of the common wiring 40 is compensated by the portion of the common connection portion 43 even if the cutout portion 54 is formed, so that the electric resistance of the common wiring 40 is small. It is suppressed.

As apparent from the description of FIG. 4, since the connecting wiring portion 50 is formed in the cutout portion 54 provided in the common wiring 40, the width of the frame region PF can be reduced. . In addition, since the connection wiring portion 50 is formed on the opposite side of the common connection portion 43 with the common wiring 40 interposed therebetween, it is easy to make the width of the routing wiring equal to or greater than a predetermined threshold value. In addition, since the conductive film 53 is formed of the same transparent conductive material as the upper electrode 28 on the same passivation film 23 as the conductive path 53 of the connecting wiring portion 50, the conductive path 53 can be formed in the same process as the upper electrode 28. It becomes like this.

[Second Embodiment]
The liquid crystal display device 10A according to the first embodiment operates in the transverse electric field type FFS mode, but the present invention can also be applied to a vertical electric field type liquid crystal display device including auxiliary capacitance electrodes. A liquid crystal display device 10B according to the second embodiment will be described with reference to FIG. In FIG. 7, the same components as those of the liquid crystal display device 10A of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Further, in the liquid crystal display device 10B according to the second embodiment, the configuration of the connecting wiring portion 50 is the same as that shown in FIG. 6 in the liquid crystal display device 10A according to the first embodiment. I will explain.

As shown in FIG. 7, each sub-pixel has a TFT and a pixel electrode 61 electrically connected to the TFT, and an auxiliary capacitance electrode 62 overlapping the pixel electrode 61 in plan view. In the liquid crystal display device 10B of the second embodiment, the common electrode is separately formed on a color filter substrate (not shown). A gate insulating film and a passivation film (not shown) are formed between the pixel electrode 61 and the auxiliary capacitance electrode 62, and these gate insulating film and passivation film are used as dielectrics.
A storage capacitor is formed between the pixel electrode 61 and the storage capacitor electrode 62. In some cases, an auxiliary capacitor is formed between the auxiliary capacitor electrode 62 and the drain electrode of the TFT via the gate insulating film. In any case, the auxiliary capacitance electrodes 62 in each column are connected by an auxiliary capacitance line 65 parallel to the scanning line 64.

In the liquid crystal display device 10B of the second embodiment, the storage capacitor line 65 is connected to the common wiring 67 formed on the gate insulating film (not shown) by the common connection portion 66 in the frame region PF. . The common connection portion 66 is formed by forming a plurality of contact holes in the gate insulating film and then directly electrically connecting the common wiring and the auxiliary capacitance line 65 when the common wiring 67 is formed. Further, in the liquid crystal display device 10B according to the second embodiment, a cutout portion 54 is formed in a part of the common wiring 67 as in the case of the liquid crystal display device 10A according to the first embodiment. The connection wiring part 50 is located. Since the configuration of the connection wiring portion 50 is the same as the configuration of the connection wiring portion 50 in FIG. 6 except that the interelectrode insulating film 2 is not present, detailed description thereof is omitted. However, the second
In the liquid crystal display device 10B of the embodiment, the gate insulating film 20 corresponds to the first insulating film of the present invention,
The passivation film 23 corresponds to the second insulating film of the present invention.

The cutout portion 54 is formed on the opposite side to the common connection portion 66 that is an electrical connection portion between the auxiliary capacitance line 65 and the common wiring 67 described above. By satisfying such a relationship, it is not necessary to increase the area for forming the connection wiring part 50 in particular.
The area occupied by the frame region can be reduced. The width of the common wiring 67 is
Even if the cutout portion 54 is formed, the width of the cutout portion 54 is supplemented by the portion of the common connection portion 66, so that the electrical resistance of the common wiring 67 is suppressed from being reduced. Further, since the conductive path 53 of the connecting wiring part 50 is formed on the passivation film 23 with the same transparent conductive material as the pixel electrode 61, the conductive path 53 can be formed in the same process as the pixel electrode 61. It becomes like this.

It is a schematic plan view which shows the array substrate of the liquid crystal display device of 1st Embodiment. FIG. 3 is a plan view of one sub pixel of the liquid crystal display device according to the first embodiment. It is the III-III sectional view taken on the line of FIG. FIG. 4 is an enlarged plan view of a portion IV in FIG. 1. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the elements on larger scale of the frame area | region of the liquid crystal display device of 2nd Embodiment. It is an enlarged plan view of a frame region of a liquid crystal display device of a conventional example.

Explanation of symbols

10A, 10B: Display panel 11: Liquid crystal layer 12: Array substrate 13: Color filter substrate 18: First substrate body 19: Scanning line 20: Gate insulating film 21: Semiconductor layer 22
: Signal line 23: passivation film 24: interlayer film 25: lower electrode 26: first contact hole 27: inter-electrode insulating film 28: upper electrode 30: first alignment film 31: slit-shaped opening 32: band-shaped electrode portion 33: first 2 substrate body 34: color filter layer 35: black matrix 36: topcoat layer 37: second alignment film 38: scanning line routing wiring section 39: signal line routing wiring section 40: common wiring 41: gate wiring 42: source wiring 43 : Common connection part (second connection part) 44: Common contact hole 46: Antistatic circuit 47: Short-circuit wiring 50: Connection wiring part (first connection part) 51, 52: Contact hole 53: Conductive path 54: Cutting Notch 61: Pixel electrode 62: Auxiliary capacitance electrode
64: Scanning line 65: Auxiliary capacitance line 66: Common connection part 67: Common wiring DA: Display area PF: Frame area Dr: First terminal part TP: Second terminal part

Claims (5)

A plurality of scanning lines provided with a pair of transparent substrates sandwiching a liquid crystal layer, and formed on the display region of one of the pair of transparent substrates in a matrix with a first insulating film sandwiched between the display regions And a signal line, and a switching element provided in the vicinity of an intersection of the plurality of scanning lines and the signal line,
A second insulating film covering the switching element, the signal line and the exposed surface of the first insulating film; and a pixel electrode formed in each region partitioned by the plurality of scanning lines and signal lines. A plurality of first wirings formed in a lower part of the first insulating film in a peripheral part of the display region;
A plurality of second wirings formed between the first insulating film and the second insulating film; a common wiring formed below or above the first insulating film; and the scanning line and the second wiring. A liquid crystal display device comprising a first connection part for electrically connecting between the two,
2. A liquid crystal display device according to claim 1, wherein a cutout portion is formed in the common wiring, and the first connection portion is formed in the cutout portion. The liquid crystal display device according to claim 1, wherein the first wiring is formed of the same material as the scanning line, and the second wiring is formed of the same material as the signal line. The first connection portion includes a first contact hole formed in the first insulating film and the second insulating film on the first wiring, and a second contact hole formed in the second insulating film on the second wiring. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed by being connected in a bridge shape with a transparent conductive material through the substrate. In the display area, auxiliary capacitance lines are provided in the same layer and in parallel with the plurality of scanning lines, the common wiring is formed on the surface of the first insulating film, and between the auxiliary capacitance lines and the common wiring. 4. The liquid crystal display device according to claim 1, wherein the second connection portion to be electrically connected is formed on the side opposite to the first connection portion across the common wiring. . An interlayer film is formed in the display region, and an upper electrode in which a plurality of slits are formed in each region partitioned by a lower electrode and the plurality of scanning lines and signal lines via an insulating film on the interlayer film. One of the lower electrode and the upper electrode is electrically connected to the switching element to be a pixel electrode, and the other of the lower electrode and the upper electrode is electrically connected to the common wiring and common. A second connection portion that is an electrode and is electrically connected between the common electrode and the common wiring is formed on the side opposite to the first connection portion with the common wiring interposed therebetween. Item 4. A liquid crystal display device according to any one of Items 1 to 3.

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