JP4957240B2 - Liquid crystal display - Google Patents

Description

The present invention relates to a liquid crystal display device, and in particular, easily controls the particle size of a spherical conductor for conducting electrical continuity between two substrates during a manufacturing process, and easily selects defective products. The present invention relates to a liquid crystal display device which can be used.

The liquid crystal display device has a configuration in which two transparent substrates on which electrodes or the like are formed face each other, the periphery of the transparent substrate is fixed with a sealing material, and liquid crystal is sealed in a space formed by the transparent substrate and the sealing material. Have. Among these, one specific example of an active matrix type liquid crystal display device is shown in FIGS.
This will be described with reference to FIG. 3 is a plan view schematically showing the first substrate side of a small-sized liquid crystal display device for portable devices, FIG. 4 is a cross-sectional view schematically showing the arrangement of a sealing material and a contact material, and FIG. 5 is a transfer electrode. FIG. 3 is an enlarged view of a main part schematically showing a connection state of the common electrode.

The first substrate 51 made of a transparent substrate of the liquid crystal display device 50 has scanning lines and signal lines formed in a matrix in the display area 52, and pixel electrodes are formed in portions surrounded by the scanning lines and signal lines. A thin film transistor TFT (Thin Film Transistor) as a switching element connected to the pixel electrode is formed at the intersection of the line and the signal line. Although specific configurations of these wirings, TFTs, and pixel electrodes are not shown, these are schematically shown as first structures 53 in FIG.

A flexible wiring substrate 54 for connecting to an image supply device (not shown) for driving the liquid crystal display device 50 is provided on the short side portion of the first substrate 51. ACF (Anisotropic Conductive Film)
: Anisotropic conductive film) The flexible wiring board 54 is connected to the driver IC 55 with data lines and control lines from the image supply device. VCOM signal, source signal, a gate signal is generated in the driver IC 55, the common wiring 56 _C respectively on the liquid crystal display device, the source wiring 56 _S, is connected to the gate line 56 _G, these source lines 56 _S and the gate wiring 56 Each _G is connected to a signal line and a scanning line in the display area 52. In the case of a medium-sized or large-sized liquid crystal display device, most of the functions mounted on the portable device driver IC 55 are mounted on a printed circuit board, and in particular, the VCOM signal is generated by the common electrode drive circuit unit, and the driver IC is mounted. It is connected to the common wiring through the flexible wiring board.

Plural, for example, four transfer electrodes ₅₇ 1 to 57 ₄ are provided on the peripheral portion on the first substrate 51. Incidentally, sectional views of one 57 _second portion of the four transfer electrodes ₅₇ 1 to 57 ₄ is shown in FIG. The transfer electrodes ₅₇ 1 to 57 _4, a gate wiring 56
_G or source wiring 56 _S is formed in the same process as that for forming the gate wiring 56 _S, and the same material as the gate wiring 56 _G or source wiring 56 _S , for example, Al metal, Al alloy or polysilicon (hereinafter “p”).
-Si ". ). The transfer electrodes 57 ₁ to 57 ₄ are adapted to the same potential are connected to one another directly connected or in the driver IC55 each other through the common line 56 _C. Then, the transfer electrodes ₅₇ 1 to 57 ₄ is electrically connected to the common electrode 58 to be described later, so that the predetermined voltage _{V COM} output from the driver IC55 is applied to the common electrode 58. In some cases, the placement of the gate wiring 56 _G and the source wiring 56 _S reversed. Further, the driver IC 55 may be arranged not only on the short side portion but also on the long side portion.

A color filter and a black matrix are formed on the second substrate 59 made of a transparent substrate. The color filter is disposed so as to face the pixel electrode of the first substrate 51, and a filter layer corresponding to each pixel is provided. The black matrix is disposed at least at a position corresponding to the scanning line and the signal line of the first substrate 51. Has been. Although a specific configuration of these color filters and the like is not shown, these are schematically shown as the second structure 60 in FIG. Further, the second substrate 59 is further provided with ITO (Indium-Tin-Oxide) or IZO (Indium-Zinc-).
A common electrode 58 made of a transparent electrode made up of (Oxide) or the like is formed over at least the entire display region 52.

Sealing material 61 around the inlet of the display area 52 of the first substrate 51 are coated with the exception of (not shown), also the contact member 57 is coated on the transfer electrode 57 _{1-57 4} . As shown in FIG. 5, the contact material 57 is formed of, for example, a thermosetting resin 63 such as an epoxy resin, a spherical conductor 64, and insulation (see Patent Document 1 below) or conductivity (Patent Document 2 or 3 below). (See) filler 65 is mixed.

As the spherical conductor 64 mixed in the contact material 57, for example, a spherical conductive particle plated with a flexible conductive metal such as Au is used, and the particle size is larger than the cell gap of the liquid crystal display device. Slightly larger ones are used, alumina particles or silica particles having an average particle size of about 1 μm are used as insulating fillers, and average particle sizes are about 0.1 to 0.5 μm as conductive fillers. About carbon black or Al powder is used. Electrical connection between the transfer electrodes 57 ₁ to 57 ₄ and the common electrode 58 via a further electrically conductive filler is a conductive member 64 and the case of the spherical when bonding the two substrates 51 and 59 if so Is formed.

When the substrates 51 and 59 are bonded together, the following procedure is performed. First, the first substrate 51
Is set in the first dispenser device and the sealing material 61 is applied in a predetermined pattern, and then the first dispenser is applied.
The substrate 51 is set in the second dispenser device, and the contact material 57 is transferred to the transfer electrode 5.
Applied over 7 _{1-57 4.} Thereafter, a temporary fixing adhesive is applied to the portion of the second substrate 59 where the sealing material 61 and the contact material 57 come into contact. Thereafter, the first substrate 51 and the second substrate 59 are bonded together, the temporary fixing adhesive is cured, and the temporary fixing is completed. And both substrates 51 temporarily fixed
59, the thermosetting resin of the sealing material 61 and the contact material 57 is cured, and an empty liquid crystal display device is completed. Liquid crystal 68 is injected into the empty liquid crystal display device from an injection port (not shown), and the injection port is closed with a sealant to complete the liquid crystal display device 50.
JP 2002-90770 A JP-A-11-95232 JP 2000-284296 A

According to the configuration of the transfer connection forming part of the above-mentioned conventional liquid crystal display device, it is possible to easily position the contact member 57 on the surface of the transfer electrodes 57 ₁ to 57 _4, the transfer electrodes 57 by electrical conductors 64 of the spherical it is possible to achieve electrical conduction between the _{1-57 4} and the common electrode. However, it is extremely difficult to control the particle size of the spherical conductor 64,
Those that are chronically out of the standard are mixed. Therefore, it is checking whether the particle size of the conductive bodies 64 of spherical disposed on the transfer electrode 57 _{1-57 4} is within specified range in the manufacturing process of the liquid crystal display device has been performed.

The inspection of the particle diameter of the spherical conductor 64 is performed by microscopic observation. However, the transfer electrodes ₅₇ 1 to 57 ₄ of the prior art, is formed by the same process of forming the gate wiring 56 _G to the source wiring 56 _S, the same material as the gate wiring 56 _G to the source wiring 56 _S, for example, Al metal Since it is made of Al alloy or p-Si, it is light-shielding. Therefore, examination of the particle size of the conductive bodies 64 of spherical disposed on the transfer electrode 57 _{1-57 4,} can not be done by microscopic observation from the back side of the first substrate 51, second substrate 59 side Need to be inspected. On the other hand, since the black matrix 67 is provided at the peripheral portion of the second substrate 59 for light shielding, the transfer electrodes 57 _{1 to} 5 from the second substrate side as described above.
The particle diameter of the conductive body 64 of the deployed spherical on 7 ₄ to inspect by microscopic observation, it is necessary to cut out a portion of the black matrix. Therefore, in the conventional liquid crystal display device, there is a possibility that light leaks from the notched portion of the black matrix.

In recent years, as a liquid crystal display device, a wide viewing angle has been achieved, and a vertical alignment (
VA (vertically aligned) type or multi-domain vertical alignment (MVA)
An ertically aligned) type transmissive or transflective liquid crystal display device is increasingly used. In addition, a low temperature poly-silicon (LTPS) method has been adopted as a method for forming switching elements, scanning lines, signal lines, gate wirings, source wirings, and the like. In such a VA type or MVA type liquid crystal display device or a liquid crystal display device manufactured by the LTPS method, a TFT as a switching element is used.
A planarizing film (sometimes referred to as an interlayer film) made of a polymer film such as polyimide is formed over the surface of the first substrate on which the scanning lines, signal lines, gate wirings, source wirings, etc. are formed. ing. At least the surface of the display area is flattened by the flattening film, and the pixel electrode is formed on the surface of the flattening film.

Therefore, in a liquid crystal display device having such a planarizing film, the surface of the transfer electrode is also covered with the planarizing film in the manufacturing process. Therefore, a contact hole is formed in the planarizing film on the transfer electrode, and a contact material including a spherical conductor is disposed in the contact hole, thereby providing a gap between the common electrode on the second substrate and the transfer electrode on the first substrate. In many cases, electrical continuity is taken. However, in this case as well, since the transfer electrode is light-shielding, the same problems as those in the conventional liquid crystal display device described above occur when inspecting the particle size of the spherical conductor disposed on the transfer electrode. Existing.

In addition, when a contact material including a spherical conductor is arranged in such a contact hole, the contact hole may not be completely filled with the contact material if the particle size of the spherical conductor is too small. There is a possibility that the transfer electrode is corroded by moisture entering from the outside. If the particle size of the spherical conductor is too large, the spherical conductor is
Since deformation in the direction along the transfer electrode is hindered by the wall of the contact hole, it becomes difficult to deform in the direction perpendicular to the transfer electrode, so that the cell gap may become too large and the display image quality may deteriorate. Also exist.

The present invention has been made to solve the problems of the conventional liquid crystal display devices as described above. In particular, the VA type or MVA type liquid crystal display device, the liquid crystal display device manufactured by the LTPS method, etc. Even in a liquid crystal display device having such a flattening film, it is possible to easily inspect the particle size of spherical conductive particles during the manufacturing process, and the particles of the spherical conductive particles as in the conventional example. It is an object of the present invention to provide a liquid crystal display device in which it is not necessary to provide a cutout in a black matrix for light shielding for diameter inspection. It is another object of the present invention to prevent deterioration in display image quality.

In order to achieve the above object, in the liquid crystal display device of the present invention, a first substrate having a pixel electrode and a second substrate having a common electrode are arranged to face each other, and the peripheral portions of both substrates are fixed by a sealant. In a liquid crystal display device in which liquid crystal is sealed between both substrates, and common wiring is disposed on the peripheral portion of the first substrate , a transparent conductive material is formed on a planarizing film disposed on the common wiring, A transfer electrode electrically connected to the common wiring through a contact hole formed in the planarizing film, a contact material including a spherical conductor, and electrically connecting the transfer electrode and the common electrode; formed between the substrate and the planarizing film has a indicates to th mark pattern sincere distance in the center及beauty of the transfer electrodes, the contact holes along the periphery of the transfer electrode groove It is formed as a plurality of holes. The liquid crystal display device of the present invention includes not only a transmissive liquid crystal display device but also a transflective liquid crystal display device.

Further, in the above SL liquid crystal display device, the mark pattern, depending on the material for forming the switching element formed on the first substrate, Al metal, may be formed by Al alloy or p-Si.

Further, in the above SL liquid crystal display device, the eye mark pattern may be provided with a circular ring or a circular arc formed in a plurality of concentric.

Further, in the above SL liquid crystal display device, attempt to transfer electrodes is made of a transparent conductive material of the field-containing electrode and the same composition, Rutoshite may be formed simultaneously with the picture element electrode.

The liquid crystal display device according to the present invention has the above-described configuration, and thus has the following excellent effects. That is, according to the liquid crystal display device of the present invention, the transfer electrode is formed of a transparent conductive material, and the light shielding property indicating the center of the transfer electrode and the distance from the center between the transfer electrode and the first substrate. Since the mark pattern formed from the material is formed, when the liquid crystal display device is inspected with a microscope from the back side of the first substrate during the manufacturing process, the spherical conductor in the contact material appears to overlap the back side of the mark pattern. The particle diameter of the spherical conductor in the contact material can be immediately confirmed on the basis of the mark pattern, and the defective product can be easily separated.

Further, since it is not necessary to observe from the second substrate side when confirming the particle size of the spherical conductor in the contact material, it is necessary to provide a notch in the black matrix on the second substrate side as in the conventional example. Therefore, there is no light leakage due to the cutout of the black matrix, so that a liquid crystal display device with good contrast can be obtained.

Further, according to the liquid crystal display device of the present invention, Al metal, Al alloy or p-Si is usually employed for forming the scanning line, signal line, etc. of the liquid crystal display device. Since the mark pattern can be formed at the same time as the signal lines are formed, it is not necessary to prepare a special material for forming the mark pattern, and it is not necessary to provide extra man-hours for forming the mark pattern.

Further, according to the liquid crystal display device of the present invention, the mark pattern is provided with a plurality of concentric rings or arcs, so that the particle diameter of the spherical conductor is extremely easy to understand.

According to the liquid crystal display device of the present invention, a planarization film is disposed between the common wiring and the mark pattern and the transfer electrode, and the transfer electrode is formed on the planarization film, Since the peripheral edge of the transfer electrode is electrically connected to the common wiring through a contact hole formed in the planarizing film, it is usually made of a light shielding member such as Al metal, Al alloy or p-Si. The formed common wiring is formed so as to partially overlap in the peripheral portion of the transfer electrode in plan view. For this reason, the portion of the transfer electrode that is shielded by the common wiring is reduced, so that when the liquid crystal display device is inspected with a microscope from the back side of the first substrate during the manufacturing process, the spherical conductor and the mark pattern in the contact material are removed. It can be clearly confirmed and the particle size of the spherical conductor in the contact material can be immediately confirmed.

In addition, since the transfer electrode is provided on the surface of the planarizing film, not only can the surface of the transfer electrode be completely covered with the contact material even if the spherical conductor has a small particle diameter, Since the electrode itself is made of a transparent conductive material such as ITO or IZO that is inactive to moisture, the transfer electrode is not corroded by moisture that has entered from the outside. Even if the diameter is large, there is no member that hinders the deformation of the spherical conductor, so the cell gap non-uniformity as in the conventional example does not occur.

Further, according to the liquid crystal display device of the present invention, the contact hole is formed in a groove or a plurality of holes along the peripheral edge of the transfer electrode, so that the area of the overlapping portion between the common wiring and the transfer electrode is reduced in plan view. However, the contact area between the common wiring and the transfer electrode can be increased, and the wiring resistance between the common wiring and the common electrode can be decreased. For this reason, a signal applied to the common electrode is less likely to be deteriorated due to the wiring resistance, so that a liquid crystal display device with good display image quality is obtained.

In addition, according to the liquid crystal display device of the present invention, since the transfer electrode is formed from a transparent conductive material having the same composition as the pixel electrode, the transfer electrode can be formed at the same time as the pixel electrode is formed, particularly for forming the transfer electrode. There is no need to prepare a special material, and there is no need for extra man-hours for forming the transfer electrode.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. Each embodiment described below is not intended to limit the present invention to what has been described herein, and the present invention has been variously modified without departing from the technical concept shown in the claims. It can be applied equally.

1 is a schematic plan view of the first substrate of the transfer electrode portion of the liquid crystal display device according to the embodiment, and FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. Further, the overall plan view of the liquid crystal display device of this embodiment is substantially the same as the liquid crystal display device 50 of the conventional example shown in FIG. 3, so that it will be described with the aid of FIG. 3 as necessary. To do.

On the surface of the first substrate 11 made of a transparent substrate such as glass of the liquid crystal display device 10, the insulation of the first substrate 11 and the insulation made of silicon nitride or silicon oxide on the first substrate 11 as necessary. A film 12 is provided, and a mark pattern 1 made of, for example, Al metal, Al alloy, p-Si, or the like is formed at a position corresponding to the formation region of the transfer electrode 13 on the surface of the insulating film 12.
4 is formed. The insulating film 12 is provided for the purpose of improving the adhesion strength of various films formed on the surface of the insulating film 12, and is not necessarily required.

A gate insulating film 15 and a passivation film 16 are covered over the entire surface of the first substrate 11 on which the mark pattern 14 is formed, and the surface of the passivation film 16 is a common made of Al metal, Al alloy, p-Si, or the like. The wiring 17 is formed in a predetermined pattern. The surface of the common wiring 17 and the exposed passivation film 16 is covered with a planarizing film 18 made of, for example, polyimide, and a part of the planarizing film 18 has, for example, a groove-shaped contact hole 19. Are formed on the surface of the planarizing film 18 and the inner surface of the contact hole 19, for example, ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide).
A transfer electrode 13 made of a transparent conductive material such as is formed.
3 is electrically connected to the common wiring 17 through a contact hole 19.

Further, a contact material 21 including a spherical conductor 20 is formed on the surface of the transfer electrode 13.
The transfer electrode 13 and the common electrode (see reference numeral 58 in FIG. 5) are electrically connected through the spherical conductor 20. The contact material 21 also serves as a sealant between the first substrate 11 and a second substrate (not shown). In the liquid crystal display device 10, the inner surface side of the contact material 21 is a display region 22. Planarization film 1 in region 22
A pixel electrode 23 (not shown in FIG. 1) made of a transparent electrode material such as ITO or IZO is formed on the surface 8.

The mark pattern 14 described above can be of any shape as long as the center 13a of the transfer electrode 13 and the distance from the center are known. Here, for example, the position corresponding to the center position 13a of the transfer electrode 13 is used. A small-diameter annular portion 14a provided at the center, a center semi-circular portion 14b whose center position coincides with the position corresponding to the center position 13a of the transfer electrode 13 and has a predetermined radius, and the transfer electrode 13 And a straight line portion 14c extending radially from a position corresponding to the center position 13a. The straight line portion 14c is provided with mark lines 14d provided at predetermined intervals, for example, 100 μm intervals. . When such a mark pattern 14 is used, the particle size of the spherical conductor is extremely easy to understand.

Any material can be used as the material for forming the mark pattern 14 as long as it is light-shielding. However, scanning lines, the gate lines of the liquid crystal display device 10 (see reference numeral 56 _G in FIG. 3)
It is preferable to form the mark pattern 14 simultaneously with the formation of the above, because it is not necessary to prepare a special material separately, and it is not particularly necessary to increase the number of steps for producing the mark pattern 14. Therefore, as a forming material of the mark pattern 14, TF as a switching element is used.
When T is manufactured by the LTPS method, p-Si is used, and in other cases, Al metal or Al alloy is used. The surface of the Al metal or Al alloy can be covered with a corrosion-resistant Mo layer.

The diameter of the spherical conductor 20 is selected to be slightly larger than the desired distance between the transfer electrode 13 and the common electrode. Therefore, when the thermosetting resin in the contact material 21 is cured, the spherical conductor 20 is crushed and slightly flattened, and the elastic force is favorable between the transfer electrode 13 and the common electrode. Electrical conduction is achieved, and the spherical conductor 20 and the transfer electrode 1 are formed by the thermosetting resin in the contact material.
3 is formed.

In the liquid crystal display device 10 having such a configuration, the transfer electrode 13 is formed of a transparent conductive material such as ITO or IZO, and the center 13 a of the transfer electrode 13 is formed on the surface of the insulating film 12 on the surface of the first substrate 11. And the mark pattern 14 formed of a light-shielding material indicating the distance from the center 13a of the transfer electrode 13 is formed. Therefore, when the microscopic inspection is performed from the back side of the first substrate 11 during the manufacturing process, A spherical conductor 20 appears to overlap the back side of the mark pattern 14. Therefore, the mark line 14d of the mark pattern 14
As a result, the particle diameter of the spherical conductor 20 in the contact material 21 can be immediately confirmed. Further, the distance from the center of the small-diameter annular portion 14a of the mark pattern 14 to the outermost periphery of the hollow semicircular portion 14b is set to the allowable maximum diameter of the spherical conductor 20 after the contact material 21 is cured. Then, it becomes possible to easily identify the oversized spherical conductor 20.

However, in the liquid crystal display device 10 of the present embodiment, even when the diameter of the spherical conductor 20 is larger than a predetermined value, a member that prevents deformation of the spherical conductor 20 is provided around the spherical conductor 20. Since it does not exist, the spherical conductor 20 can be greatly deformed. Therefore, the distance between the first substrate 11 and the second substrate, that is, the cell gap is not affected as in the case of the conventional example in which the spherical conductor is arranged in the contact hole.

Even when the diameter of the spherical conductor 20 is smaller than a predetermined value, the contact material 21 completely surrounds the periphery of the transfer electrode 13 as long as electrical conduction between the transfer electrode 13 and the common electrode is ensured. In addition, since the transfer electrode 13 is formed of a transparent conductive material such as ITO or IZO that is inactive to moisture, the transfer electrode 13 may be corroded by moisture entering from the outside. Disappears.

Further, when confirming the particle size of the spherical conductor 20 in the contact material 21, it is only necessary to observe from the first substrate 11 side, and it is not necessary to observe from the second substrate side. In addition, it is not necessary to provide a notch in the black matrix on the second substrate side. In this case, light leakage due to the black matrix notch as in the conventional example is eliminated, so that the liquid crystal display device 10 with good contrast can be obtained. However, when it is necessary to enable observation from the second substrate side, a notch may be provided in the black matrix on the second substrate side.

Further, in the liquid crystal display device 10 of the present embodiment, the transfer electrode 13 is formed on the planarizing film 18, and the common wiring 17 is connected via the contact hole 19 formed in the planarizing film 18 at the peripheral portion of the transfer electrode 13. Usually, Al metal,
The common wiring 17 formed of a light shielding member such as an Al alloy or p-Si is formed so as to partially overlap the peripheral portion of the transfer electrode 13 in plan view. Therefore, the portion of the transfer electrode 13 that is shielded from light by the common wiring 17 is reduced. Therefore, when the liquid crystal display device 10 is inspected with a microscope from the back side of the first substrate during the manufacturing process, the spherical conductor 20 in the contact material 21. And the mark pattern can be clearly confirmed, and the particle diameter of the spherical conductor 20 in the contact material 21 can be immediately confirmed.

Further, in the liquid crystal display device 10 of this embodiment, the contact hole 19 is formed in the transfer electrode 1.
3 is formed in a groove shape along the peripheral edge of the common wiring 17 and the transfer electrode 1 in plan view.
3, the area of contact between the common wiring 17 and the transfer electrode 13 can be increased while reducing the area of the overlapping portion between the three. Therefore, the wiring resistance between the common wiring 17 and the common electrode can be reduced, and the signal applied to the common electrode is less likely to be deteriorated due to the wiring resistance. Therefore, the liquid crystal display device 10 with good display image quality. Is obtained. Note that the shape of the contact hole 19 is not limited to the groove shape, but the same effect can be obtained not only as a multipoint contact hole provided with a plurality of holes.

Further, in the liquid crystal display device 10 of the present embodiment, since the transfer electrode 13 and the pixel electrode 23 are formed of the transparent conductive material having the same composition, the transfer electrode 13 can be formed at the same time as the pixel electrode 23 is formed. For this reason, it is not necessary to prepare a special material for forming the transfer electrode, and it is not necessary to provide extra man-hours for forming the transfer electrode.

Although the transmissive liquid crystal display device is shown as the liquid crystal display device 10 of this embodiment, a transflective liquid crystal display device may be used. In this case, the pixel electrode 23 has a surface A or a lower surface thereof.
A reflector made of l metal or Ag metal may be provided.

Moreover, although the example applied to the liquid crystal display device 10 of an Example was applied to what has the planarization film | membrane 18, it was arrange | positioned on the transfer electrode 13 by observing from the back side of the 1st board | substrate 11 of this invention. The effect that the particle diameter of the spherical conductor can be detected is achieved if the transfer electrode 13 is made of a transparent conductive material and a mark pattern is formed between the transfer electrode 13 and the first substrate 11. Therefore, the present invention can also be applied to a conventional liquid crystal display panel that does not include a planarizing film as shown in FIGS.

It is a schematic plan view of the 1st board | substrate of the transfer electrode part of the liquid crystal display device of an Example. It is a schematic cross section along the AA line of FIG. It is a top view which shows typically the 1st board | substrate side of a liquid crystal display device. It is sectional drawing which shows typically arrangement | positioning of the sealing material and contact material of a liquid crystal display device. It is a principal part enlarged view which shows typically the connection state of a transfer electrode and a common electrode.

Explanation of symbols

10 Liquid crystal display device, 11 First substrate, 12 Insulating film, 13 Transfer electrode, 14
Mark pattern, 15 Gate insulating film, 16 Passivation film, 17 Common wiring, 1
8 planarization film, 19 contact hole, 20 spherical conductor, 21 contact material, 2
2 display area, 23 pixel electrode

Claims (4)

A first substrate having a pixel electrode and a second substrate having a common electrode are arranged to face each other, the peripheral portions of both substrates are fixed by a sealant, and liquid crystal is sealed between the two substrates. In the liquid crystal display device in which the common wiring is arranged in the part,
A transfer electrode that is formed of a transparent conductive material on the planarizing film disposed on the common wiring and is electrically connected to the common wiring through a contact hole formed in the planarizing film;
A contact material including a spherical conductor, and electrically connecting the transfer electrode and the common electrode;
A mark pattern formed between the first substrate and the planarization film and indicating a center of the transfer electrode and a distance from the center ;
Have
The contact hole is formed as a groove or a plurality of holes along the peripheral edge of the transfer electrode.
Liquid crystal display device. The mark pattern, depending on the material for forming the switching element formed on the first substrate, Al metal, the liquid crystal display device according to 請 Motomeko 1 that is formed by Al alloy or polysilicon. The mark pattern, the liquid crystal display device according to 請 Motomeko 1 that comprise a plurality of annular or arc concentrically formed. The liquid crystal display device according to claim 1, wherein the transfer electrode is made of a transparent conductive material having the same composition as the pixel electrode and is formed at the same time as the pixel electrode.

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