JP3083717B2 - Liquid crystal display panel and liquid crystal display device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct-view type liquid crystal display device which can be used for AV (Audio Vidual) equipment and OA (Office Automation) equipment.

[0002]

2. Description of the Related Art In recent years, home televisions used as AV equipment and display devices used for OA equipment have been reduced in weight.
There is a demand for thinner, lower power consumption, higher definition, and larger screens. For this reason, CRTs and liquid crystal display devices (LC
D), plasma display device (PDP), EL display device, L
Development of large screens for display devices such as ED display devices
Practical application is underway.

[0003] Among them, the liquid crystal display device has the advantages that the thickness (depth) can be remarkably reduced, the power consumption is small, and the full color display is easy, compared with other display devices. It is being used in various fields, and there is great expectation for larger screens.

However, in a liquid crystal display device, when the size of a screen is increased, a defective rate due to disconnection of a signal line, a pixel defect, or the like in a manufacturing process rapidly increases, and further, the price of the liquid crystal display device increases. Occurs. Therefore, in order to solve the above-mentioned problems, a plurality of liquid crystal display panels are connected to form a single liquid crystal display device as a whole, and the screen is enlarged.

[0005] As a liquid crystal display device for increasing the screen size by connecting a plurality of liquid crystal display panels as described above, for example, as shown in FIG.
There is a liquid crystal display device to which the LCD 102 is connected.

[0006] The panel substrates 103 and 104 of the liquid crystal display panels 101 and 102 have pixels 1 in a matrix.
06 are arranged, and the pixel 106 includes three pixel electrodes 105 corresponding to R (red), G (green), and B (blue) color filters for color display.

As shown in FIG. 7, the pixel 106 has a TFT (Thin F) connected to each pixel electrode 105.
ilm Transistor) 108. This TFT
The scan electrode 109 and the data signal electrode 110, which are insulated from each other by the insulating films 111, are connected to 108, so that the pixel electrodes 105 are independently driven.

Conventionally, a liquid crystal display panel has a structure in which a pair of substrates having electric wiring formed on at least one substrate is bonded with a sealing material made of a thermosetting resin, and a liquid crystal layer is sandwiched between the substrates. Has become.

As described above, when a thermosetting resin is used as the sealing material, the alignment of the liquid crystal in the range of several hundred μm in the vicinity of the sealing material is caused by the disorder of the sealing shape at the time of heat rise and the exudation of the residual solvent. Since there is a possibility of causing disturbance, the seal pattern cannot be arranged in the vicinity of the pixel. For this reason, it is necessary to dispose the seal pattern away from the pixels, and when a plurality of liquid crystal display panels are joined together, the area of the seal material occupying the joint portion becomes large, the joint is conspicuous, and the display quality is reduced. Was. Therefore, as a means for solving these problems, an ultraviolet curable resin or an ultraviolet curable resin combined with heat is being used as a sealing material.

[0010] However, even if an ultraviolet-curable resin or an ultraviolet-curable resin combined with heat is used as a sealing material,
If the seal pattern is thick, the area of the seal occupying the joint portion of the liquid crystal panel becomes large, and the joint of the liquid crystal panel becomes conspicuous.

For this reason, the liquid crystal display panels 101 and 102
As shown in FIG. 8, it is necessary to form the sealing material 112 in a very thin pattern near the seam. Further, in order to reduce the area of the seal occupying the joint portion of the liquid crystal panel as much as possible, it is necessary to dispose the seal material 112 having such a thin pattern as close as possible to the pixel 106 as shown in FIG. .

By the way, a method of using an ultraviolet-curable resin or an ultraviolet-curable resin combined with heat as a sealing material for a liquid crystal display panel has been used particularly for manufacturing a small liquid crystal panel of about 1 to 2 types. This is because, in such a small liquid crystal panel, the pixel electrodes and electrical wiring are extremely small, and it is necessary to bond the panels with high precision. This is because it is desirable to use an ultraviolet curable resin.

In general, in the case of a small liquid crystal panel of about 1 to 2 types, when an ultraviolet lamp is used to irradiate a sealing material made of an ultraviolet-curable resin or a thermosetting ultraviolet-curable resin with ultraviolet rays to cure the sealing material, Since the line width of the electric wiring attached to the electric wiring is very thin, 20 μm or less, the sealing material formed on the electric wiring can be sufficiently irradiated with ultraviolet rays, and the sealing material is cured with high accuracy in a short time. It becomes possible.

[0014]

By the way, in the case of a liquid crystal display device in which a plurality of liquid crystal display panels are connected for a large-screen display, as shown in FIG. The liquid crystal display panel is disposed below the black matrix 5 in order to make the seams of the liquid crystal display panel inconspicuous. For this reason, ultraviolet rays cannot be applied to the sealant 112 from the outside of the substrate provided with the black matrix 5, and ultraviolet rays can be applied to the sealant 112 from the other substrate (substrate provided with the TFT). Must.

Further, when the liquid crystal display device is constituted by a large liquid crystal display panel, it is necessary to increase the line width of the electric wiring in order to reduce the delay of the electric signal.
Electric wiring having a line width of 20 μm or more is required. In particular, when the liquid crystal display device has a screen of about 30 inches, or when the electric wiring also serves as an electrode as an auxiliary capacitor, the line width of the electric wiring is required to be around 100 μm.

As described above, when the line width of the electric wiring provided in the liquid crystal display panel is as large as about 100 μm,
Even if ultraviolet rays are applied to the sealing material 112 made of an ultraviolet curing resin or an ultraviolet curing resin combined with heat using an ultraviolet lamp, the sealing material 112 (FIG. 7) formed on the electric wiring is sufficiently irradiated with ultraviolet rays. Can not do
Poor curing of the sealing material 112 is likely to occur. Therefore, when the vacuum injection method is used at the time of liquid crystal injection, the sealing material 1
Due to the curing failure of 12, the degree of vacuum in the cell cannot be maintained, and the liquid crystal cannot be sufficiently injected, or the liquid crystal alignment near the sealing material 112 is disturbed.

When the line width of the electric wiring is large as described above, it is possible to cure the sealing material on the electric wiring to some extent by irradiating ultraviolet rays for a long time. In this case, the liquid crystal display panel absorbs the ultraviolet light. This causes a problem that heat is generated and distortion occurs.

The present invention has been made in view of the above problems, and an object of the present invention is to sufficiently irradiate a sealing material disposed on an electric wiring with ultraviolet light in a short time, thereby to improve the sealing material. Eliminating curing failure, and as a result, it is possible to provide a high-quality liquid crystal display panel with no bleeding of the sealing material to the pixels, and in a liquid crystal display device in which a plurality of such liquid crystal display panels are connected adjacent to each other, It is an object of the present invention to provide a liquid crystal display device with excellent display quality, in which joint portions between the two are inconspicuous.

[0019]

According to a first aspect of the present invention, there is provided a liquid crystal display panel, wherein at least one of the substrates has a material that blocks ultraviolet rays.
A pair of substrates electric wiring is formed consisting of the, bonded by a sealing material made of arranged ultraviolet curable resin or a heat setting type ultraviolet curable resin so as to cross part and the electric wiring board peripheral portion, In the liquid crystal display panel in which the liquid crystal layer is sandwiched between the pair of substrates, the electric wiring has a line width in a region intersecting with the sealing material is smaller than a line width in a region not intersecting with the sealing material. It is characterized by being formed as follows.

According to a second aspect of the present invention, there is provided a liquid crystal display panel comprising: a pair of substrates having at least one substrate on which electric wiring is formed; In a liquid crystal display panel in which a liquid crystal layer is interposed between a pair of substrates and a liquid crystal layer is interposed between the pair of substrates, an opening is formed in a region intersecting with the sealing material. It is characterized by being.

According to a third aspect of the present invention, there is provided a liquid crystal display panel wherein a pair of substrates having at least one substrate formed with an electric wiring made of a material that blocks ultraviolet rays partially intersects the electric wiring at a peripheral portion of the substrate. In a liquid crystal display panel in which a liquid crystal layer is sandwiched between a pair of substrates, the liquid crystal display panel is bonded to a sealing material made of an ultraviolet-curable resin or a thermosetting and ultraviolet-curing resin arranged together. The intersection region is characterized by being formed of a transparent electrode capable of transmitting ultraviolet light.

According to a fourth aspect of the present invention, in the liquid crystal display panel according to the third aspect, the transparent electrode is formed of indium tin oxide.

According to a fifth aspect of the present invention, there is provided a liquid crystal display panel according to the first aspect.
2. The liquid crystal display panel according to 2, 3, or 4,
Black matrix that blocks ultraviolet light on the other substrate
There made form, and the above-described black matrix and the sealing material
Are characterized by being arranged to overlap.

According to a sixth aspect of the present invention, there is provided a liquid crystal display device according to the first aspect.
A plurality of liquid crystal display panels described in 2, 3, 4 or 5 are connected adjacently and are arranged on the same plane.

[0025]

According to the first aspect of the present invention, ultraviolet rays are blocked.
The electric wiring made of the material is formed so that the line width in a region that intersects with the sealing material is smaller than the line width in a region that does not intersect with the sealing material. When the sealing material is irradiated with ultraviolet light from above, it is possible to sufficiently irradiate the sealing material disposed on the electric wiring having the reduced line width with ultraviolet light.

Thus, the material from which ultraviolet rays are blocked
In the intersection region between the electric wiring and the sealing material, it is possible to eliminate the curing failure of the sealing material, so that the sealing material of the bonded substrates can be sufficiently cured.

[0027] Therefore, it is possible to eliminate the disorder of the alignment, the defective injection of the liquid crystal, and the like due to the poor curing of the sealing material, so that the effect of the sealing material on the pixels can be eliminated. Can be improved.

According to the second aspect of the present invention, since the electric wiring has an opening in a region intersecting with the sealing material, the sealing material is irradiated with ultraviolet rays from outside the substrate on which the electric wiring is disposed. In addition, it is possible to sufficiently irradiate the sealing material disposed on the electric wiring with ultraviolet rays.

This makes it possible to eliminate poor curing of the seal material in the intersection region between the electric wiring and the seal material, and thus sufficiently cure the seal material of the liquid crystal display panel.

[0030] Therefore, it is possible to eliminate the disorder of the alignment and the poor injection of the liquid crystal due to the poor curing of the sealing material, so that the effect of the sealing material on the pixels can be eliminated. As a result, the display quality of the liquid crystal display panel can be improved. Can be improved.

According to the third aspect of the present invention, ultraviolet rays are blocked.
Intersection area between the sealing material of the electric wiring made of a material that is, that are formed by ultraviolet-permeable transparent electrode, if the outer distribution設基plate electric wiring was irradiated with ultraviolet light to the sealing material, ultraviolet More ultraviolet rays can be applied to the sealing material disposed on the transparent electrode than when the electric wiring made of the material to be cut off is made thinner.

Thus, the sealing material can be cured in a short time in the intersection region between the electric wiring and the sealing material, so that the distortion of the substrate caused by the temperature rise of the substrate due to the long-time irradiation of the ultraviolet rays can be eliminated. it can.

Therefore, it is possible to eliminate the disorder of the alignment and the defective injection of the liquid crystal due to the poor curing of the sealing material, so that the effect of the sealing material on the pixels can be eliminated and the display quality of the liquid crystal display panel can be improved. Can be.

According to the structure of the fourth aspect, in addition to the function of the third aspect, the transparent electrode is formed of indium tin oxide, so that when the pixel electrode is formed of indium tin oxide, Since the transparent electrode is made of the same material as the pixel electrode, the process of forming the pixel electrode can be used as it is for the formation of the transparent electrode. Therefore, a special manufacturing process for forming the transparent electrode is not required, the manufacturing process can be simplified, and an increase in manufacturing cost caused by forming the transparent electrode can be suppressed.

According to the structure of claim 5, claims 1, 2,
Action of 3 or 4, the ultraviolet light to the substrate of at least another side
Black matrix is formed to block and black
The matrix and the sealing material are arranged so as to overlap
Also applicable to cases.

According to the structure of claim 6 , claims 1, 2,
3. A plurality of liquid crystal display panels described in 3 , 4 or 5 are adjacently connected and arranged on the same plane, thereby enabling a large-screen display, and a display quality in which joints between the liquid crystal display panels are inconspicuous. , A liquid crystal display device excellent in the above can be realized.

[0037]

[Embodiment 1] An embodiment of the present invention is described below with reference to FIGS. In this embodiment, a description will be given of a liquid crystal display device which performs a large-screen display by connecting two liquid crystal display panels adjacent to each other. The same applies to the following embodiments.

In the liquid crystal display device according to this embodiment, as shown in FIG. 2, adjacently connected liquid crystal display panels 1 and 2 are arranged on the same plane of one large transparent substrate 3. A direct-view type liquid crystal display device provided with a backlight made of a cold cathode tube or the like (not shown) on the back side of 2. That is, in the liquid crystal display device having the above configuration, the image information formed on the liquid crystal display panels 1 and 2 is observed on the large transparent substrate 3 side by modulating the irradiation light from the backlight by the liquid crystal display panels 1 and 2. Are visible to the public.

In the liquid crystal display panels 1 and 2, a TFT substrate 10 made of a transparent insulating substrate and a counter substrate 11 are arranged to face each other, bonded together via a sealing material 6, and filled with liquid crystal to form a liquid crystal layer 7. That is, the liquid crystal layer 7 is sandwiched between the TFT substrate 10 and the counter substrate 11.
The sealing material 6 is made of, for example, an ultraviolet curable resin or a thermosetting ultraviolet curable resin. The ultraviolet curable resin used herein is, for example, an acrylic or epoxy resin, which is a resin which is activated and activated by irradiation with ultraviolet rays. For this reason, since no heat dripping occurs, it becomes possible to dispose the sealing material 6 very close to the pixel.

As shown in FIG. 4, the sealing material 6 is arranged at the peripheral edge of each of the liquid crystal display panels 1 and 2. After the sealing material 6 is cured, the liquid crystal is sealed through the openings 6a. It has become.

As shown in FIG. 3, on the TFT substrate 10, matrix-shaped pixel electrodes 15 are formed, and signal electrodes 13 and scanning electrodes 14 are formed. A thin film transistor (TFT) 16 is provided at the intersection of the signal electrode 13 and the scanning electrode 14, and the pixel electrode 15 is connected to the TFT 16.

The pixel electrode 15 is made of a transparent conductive film such as ITO (indium tin oxide) when used as a transmissive display device, and Al when used as a reflective display device.
And the like. The TFT 16 is a field-effect transistor using a semiconductor thin film such as amorphous silicon (a-Si: H) or polycrystalline silicon (p-Si), and controls supply of an image signal to the pixel electrode 15. That is, the pixel electrode 15 is turned on / off of the TFT 16 by signals from the signal electrode 13 and the scanning electrode 14.
Driven by F.

The common electrode 12 is provided on the counter substrate 11.
Are formed, and R corresponding to each pixel electrode 15.
(Red), G (green), B (blue) color filters 4 ...
A black matrix 5 for separating each pixel is formed.

The black matrix 5 includes the pixel electrode 1
5 are provided to block light from entering the gaps between TFTs and the TFT area. For example, when light passes through areas other than the pixel electrodes 15, the quality of the black display state is reduced, and the contrast is reduced. When light enters the TFTs 16, a leakage current is generated in the TFT channels due to light excitation, and the display quality is degraded. The black matrix 5 prevents this.

The black matrix 5 is formed of a light absorbing film made of a material that absorbs light and exhibits a black color.

The connection relationship between the signal electrode 13, the scanning electrode 14, the pixel electrode 15, and the TFT 16 of the TFT substrate 10 will be described later in detail.

Further, the TFT substrate 10 and the counter substrate 11
Means that the surfaces of the liquid crystal layer 7 on the respective opposing surfaces are in contact with each other,
An alignment film (not shown) for aligning liquid crystal molecules in a predetermined direction is formed. The alignment film is formed by performing a homogeneous alignment process by a rubbing method or the like, whereby the liquid crystal molecules of a nematic liquid crystal having a positive dielectric anisotropy sealed between the TFT substrate 10 and the counter substrate 11 are formed. Is twisted by 90 ° between the two substrates. Therefore, the liquid crystal display panels 1 and 2 of this embodiment
Drive liquid crystal molecules in a twisted nematic (TN) display mode.

As shown in FIG. 2, a connection portion (seam line) 18 between the liquid crystal display panel 1 and the liquid crystal display panel 2 is filled with a refractive index adjusting material 9. This refractive index adjusting material 9 is used for forming the liquid crystal display panels 1 and 2.
It is made of a material having substantially the same refractive index as the FT substrate 10 and the counter substrate 11.

In this embodiment, a glass substrate having a refractive index of 1.53 (Corning 7
059), the refractive index adjusting material 9 is
It is necessary to use a material having a refractive index of 1.53. For example, an ultraviolet curable resin having a double bond site such as an acrylic resin or an ene / thiol, and the double bond is cleaved by irradiation with ultraviolet light to promote polymerization, and the refractive index after curing is 1.53. It is good to use a certain resin. In addition, a refractive index adjusting liquid such as silicone oil having a refractive index of 1.53 can be used.

The refractive index adjusting material 9 can also be used as an adhesive for bonding the liquid crystal display panels 1 and 2 on the large transparent substrate 3.

As described above, the connection portion 18 of the liquid crystal display panels 1 and 2 is provided with the refractive index adjusting material 9 having substantially the same refractive index as that of the TFT substrate 10 and the counter substrate 11 constituting the liquid crystal display panels 1 and 2. Filled, liquid crystal display panel 1
Light is prevented from being refracted and scattered due to unevenness of the end face of the substrate at the second connection portion 18. This makes it possible to obtain a natural image with no noticeable seams.

As described above, the refractive index adjusting material 9 can also be used as an adhesive when the liquid crystal display panels 1 and 2 are bonded to the large transparent substrate 3; When light is reflected at the interface between the transparent substrate 3 and the opposing substrate 11, the display contrast is reduced. Therefore, it is preferable to use a resin having the same refractive index as the opposing substrate 11 and the large transparent substrate 3. This makes it possible to obtain a natural image with less noticeable seams.

In this way, the two liquid crystal display panels 1.
A multi-panel type liquid crystal display device is formed by disposing a polarizing plate 8 on substantially the entire surface of each of the front and back surfaces of a large panel formed by joining the two in a direction in which the polarization axes are orthogonal to each other.

In the above-mentioned liquid crystal display device, light leaks from the connecting portion 18 of the liquid crystal display panels 1 and 2 in black in the crossed Nicols state of the polarizing plates 8.8. Therefore, when viewed from an observer located substantially in front of the liquid crystal display device, a complete black state can be realized in the crossed Nicols state of the polarizing plates 8.8 at the joints of the connection portions of the liquid crystal display panels 1 and 2. The joints of the liquid crystal display panels 2 can be made less noticeable. In addition, since the black matrix 5 provided on the liquid crystal display panel 2 is formed of a light absorbing film made of a material that absorbs light and exhibits a black color, surface reflection by the black matrix 5 is eliminated, and further, The joints of the liquid crystal display panels 2 can be made less noticeable.

Further, in the liquid crystal display device having the above configuration, each pixel electrode 15 corresponds to each of the R, G, and B color filters 4 (FIG. 3), and as shown in FIG. One pixel 17 is formed by the three pixel electrodes 15 of B.

The pixel 17 is connected to each pixel electrode 15
Are driven by the TFTs 16 connected to. That is, the signal electrodes 13 and the scanning electrodes 14 which are respectively insulated by the insulating films 19 are connected to the TFT 16 so that the pixel electrodes 15 are independently driven. The scanning electrode 1 is located near the pixel 17.
The sealing material 6 is arranged so as to intersect the plane 4 in a plane. As described above, since the sealing material 6 is made of an ultraviolet-curing resin or a thermosetting ultraviolet-curing resin, no heat dripping occurs and it is possible to arrange the sealing material 6 in the very vicinity of the pixel 17. Has become.

The scanning electrode 14 has a thin line portion 14 a formed at the intersection with the sealing material 6, which is thinner than other portions of the scanning electrode 14. The thin line portion 14a is formed so as to be thin in a region having the same length as the width of the sealing material 6 of the scanning electrode 14. Thereby, the TFT substrate 10
Ultraviolet rays emitted from the outside of FIG.
Irradiation is performed on the sealing material 6 arranged so as to intersect the scanning electrode 14 in a plane via the thin line portion 14 a of the sealing material 6.
To cure. At this time, the thin line portion 14a of the scanning electrode 14
Is 50 μm or less, the liquid crystal display panel 1
Thus, the sealing material 6 can be hardened by irradiating ultraviolet rays for a short time so as not to cause distortion due to heat in the sealing material 2, which is effective.

In order to make the seams between the liquid crystal display panels inconspicuous, it is necessary to arrange the sealing material 6 as close to the pixels 17 as possible near the seams. The sealing material 6 is made of an ultraviolet-curable resin or an ultraviolet-curable resin combined with thermosetting. As a result, the sealing material 6 made of an ultraviolet-curing resin or a thermosetting ultraviolet-curing resin can reduce the disturbance of the liquid crystal display in the vicinity of the sealing material 6 and improve the position accuracy of bonding the substrates 10 and 11. Has the advantage of being able to
When the sealing material 6 is arranged in the vicinity of the pixel 17 as in the liquid crystal display device shown in this embodiment, or when a small-sized liquid crystal display device used for a viewfinder of a video camera or the like has a small pixel size and is attached to an advanced substrate. Used when alignment accuracy is required.

When the sealing material 6 is cured, that is, when the ultraviolet curable resin is cured, it is necessary to irradiate ultraviolet rays from outside. However, in a liquid crystal display device in which the liquid crystal display panels 1 and 2 are joined together as in the liquid crystal display device having the above-described configuration, the sealing material 6 is provided with a black matrix 5 in order to make the seams of the liquid crystal display panels 1 and 2 inconspicuous. Is located under. Therefore, ultraviolet rays cannot be applied to the sealing material 6 from the outside of the counter substrate (substrate provided with the black matrix 5) 11 and the TFT
Ultraviolet rays must be irradiated from the substrate (substrate provided with TFT) 10 side.

By the way, as shown in FIG. 7, in the conventional electrode wiring pattern, when ultraviolet rays are irradiated on the sealant 112 from the TFT substrate 108 side, the ultraviolet rays are emitted at the intersection portion 109 a of the scan electrode 109 with the sealant 112. There is a possibility that the sealing material 112 on the plane crossing portion 109a is not irradiated with sufficient ultraviolet rays. In particular, a liquid crystal display device having a screen size of about 30 inches or a scanning electrode 109
However, the scanning electrode 109 must have a line width of at least 100 μm if the electrode also serves as an auxiliary capacitance.

As described above, when the scanning electrode 109 provided in the liquid crystal display panel has a very large line width of about 100 μm, a sealing material made of an ultraviolet curable resin or an ultraviolet curable resin combined with heat using an ultraviolet lamp. Irradiation of the ultraviolet rays 112 may cause the scanning electrode 109 to intersect with the plane intersection portion 109.
Ultraviolet rays do not sufficiently reach the sealing material 112 formed on the sealing material 112a, and there is a possibility that poor curing of the sealing material 112 may occur.

Therefore, when the curing failure of the sealing material 112 occurs, if the vacuum injection method is used at the time of injecting the liquid crystal, the degree of vacuum in the cell cannot be maintained, so that the liquid crystal cannot be injected sufficiently or the liquid crystal alignment near the sealing material 112 is changed. There are problems such as disturbing.

However, in the present embodiment, since the thin line portion 14a is formed at the intersection of the scanning electrode 14 and the sealing material 6, the scanning electrode 14 is formed even in the region where the pattern of the scanning electrode 14 and the pattern of the sealing material 6 intersect. It is possible to irradiate sufficient ultraviolet rays to the sealing material 6 without blocking ultraviolet rays, and it is possible to prevent poor curing of the sealing material 6. In particular, when the width of the thin line portion 14a is 50 μm or less, the sealing material 6 can be completely cured on the scanning electrode 14 by short-time ultraviolet irradiation, and the liquid crystal display panels 1 and 2 are irradiated with ultraviolet light. The adverse effect, that is, the distortion of the panel due to the temperature rise due to the long-time irradiation of ultraviolet rays, and the like are eliminated.

Therefore, the liquid crystal display panel 1 having the above configuration
In (2), pattern disturbance of the sealing material 6 and disturbance of liquid crystal alignment near the sealing material 6 due to poor curing of the sealing material 6 can be eliminated. As a result, the seam of the connecting portion 18 of the liquid crystal display panels 1 and 2 can be eliminated. , A liquid crystal display device having excellent display quality can be realized.

In this embodiment, the TN mode is adopted as the driving mode of the liquid crystal. However, the present invention is not limited to this mode. For example, the present invention can be applied to the case where the liquid crystal is driven in the STN (Super Twisted Nematic) mode. can do.

Embodiment 2 The following will describe another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The same applies to the following embodiments.

As shown in FIG. 5, the liquid crystal display device according to this embodiment includes a TFT substrate 21 having an opening 20a formed at the intersection of the scanning electrode 20 and the sealing material 6.

The opening 20 a of the scanning electrode 20 has a length slightly larger than the width of the sealing material 6 and a width
The opening 20a allows the sealing material 6 on the intersection with the scanning electrode 20 to be sufficiently irradiated with ultraviolet light from outside the TFT 21 by the opening 20a. . Thereby, the sealing material 6 at the intersection with the scanning electrode 20 can be sufficiently cured.

As described above, the sealing material 6 of the scanning electrode 20
By forming the opening 20a at the intersection with the above, the same effect as in the first embodiment can be obtained.

The shape of the opening 20 a of the scanning electrode 20 is such that a TFT is formed on the sealing material 6 at the intersection with the scanning electrode 20.
Any shape may be used as long as it can sufficiently irradiate ultraviolet rays from the substrate 21 side. The size is set in consideration of the line width of the scanning electrode 20 and the like.

Third Embodiment Still another embodiment of the present invention is described below with reference to FIG.

In the liquid crystal display device according to this embodiment, as shown in FIG. 6, the scanning electrode 22 is cut in the area where the scanning electrode 22 and the sealing material 6 intersect in the vicinity of the position where the sealing material 6 is provided. The cut portion is a TFT substrate 2 to which a transparent electrode 23 is connected.
4 is provided.

The transparent electrode 23 is configured so that the sealing material 6 on the transparent electrode 21 can be sufficiently irradiated with ultraviolet rays. That is, the transparent electrode 23 only needs to be able to transmit 50% or more of ultraviolet light having a wavelength of 365 nm, and for example, indium tin oxide (ITO) can be used. This ITO
Can also be used for the pixel electrode 15, so that the transparent electrode 23 and the pixel electrode 15 can be formed of the same material, which is convenient in the manufacturing process.

Further, the transparent electrode 23 is
Is formed thicker than the width of. This is generally ITO
Since the surface resistance is higher than that of the scanning electrode 22 (metal wiring) used for the electric wiring, forming the transparent electrode 23 with the same width as the scanning electrode 22 increases the wiring resistance. This is because the line resistance is made wider than the scanning electrode 22 to reduce the wiring resistance.

As described above, the transparent electrode 2 is originally located in the region of the scanning electrode 22 where the sealing material 6 and the scanning electrode 22 intersect.
3 and the transparent electrode 23 is electrically connected to the scanning electrode 22, so that ultraviolet light can be sufficiently emitted from the TFT substrate 24 toward the sealing material 6. For this reason, as in the first embodiment, the sealing material 6 disposed on the thin line portion 14a in which the line width of the scanning electrode 14 is reduced.
More ultraviolet rays can be applied to the sealing material 6 disposed on the transparent electrode 23 than that.

Thus, in the region of the scanning electrode 22 where the sealing material 6 and the scanning electrode 22 intersect, the curing of the sealing material 6 can be performed in a short time. Substrate distortion that occurs can be eliminated.

Further, since it is not necessary to reduce the line width of the scanning electrode 22, even in the case where the line width of the scanning electrode 22 cannot be reduced so that the scanning electrode 22 also serves as the capacitance, the scanning electrode 22 can be used. The sealing material 6 on the substrate 22 can be sufficiently cured.

In Examples 1 to 3, 2
Although the liquid crystal display device in which two liquid crystal display panels are joined has been described, the present invention is not limited to this, and can be applied to a liquid crystal display device in which two or more liquid crystal display panels are joined. The present invention can also be applied to other liquid crystal display devices using a curable resin or an ultraviolet curable resin combined with heat as a sealing material, for example, a small liquid crystal display device used for a viewfinder such as a video camera.

[0079]

As described above, in the liquid crystal display panel according to the first aspect of the present invention, at least one of the substrates blocks ultraviolet rays.
A pair of substrates on which electric wiring made of a material is formed are adhered by a sealing material made of an ultraviolet curable resin or a thermosetting UV curable resin arranged so as to partially intersect the electric wiring at a peripheral portion of the substrate. In a liquid crystal display panel having a liquid crystal layer sandwiched between the pair of substrates,
The electric wiring is configured such that a line width in a region intersecting with the sealing material is smaller than a line width in a region not intersecting with the sealing material.

Thus, the material from which ultraviolet rays are blocked
In the intersection region between the electric wiring and the sealing material, it is possible to eliminate the curing failure of the sealing material, so that the sealing material of the bonded substrates can be sufficiently cured. Therefore, it is possible to eliminate the disorder of the alignment and the poor injection of the liquid crystal due to the poor curing of the sealing material, so that the influence of the sealing material on the pixels can be eliminated, and as a result, the display quality of the liquid crystal display panel can be improved. This has the effect that it can be performed.

In the liquid crystal display panel according to the second aspect of the present invention, as described above, a pair of substrates, each having at least one of the substrates on which the electric wiring is formed, are arranged so as to partially intersect the electric wiring at the periphery of the substrate. In a liquid crystal display panel in which a liquid crystal layer is sandwiched between a pair of substrates, the electric wiring intersects with the sealing material. This is a configuration in which an opening is formed in a region to be formed.

As a result, in the intersection region between the electric wiring and the sealing material, it is possible to eliminate the curing failure of the sealing material, so that the sealing material of the liquid crystal display panel can be sufficiently cured. Therefore, it is possible to eliminate the disorder of the alignment and the insufficient injection of the liquid crystal due to the poor curing of the sealing material, and as a result, it is possible to improve the display quality of the liquid crystal display panel.

In the liquid crystal display panel according to the third aspect of the present invention, as described above, at least one of the substrates blocks ultraviolet rays.
A pair of substrates on which electric wiring made of a material is formed are bonded together by a sealing material made of an ultraviolet-curable resin or a thermosetting UV-curable resin arranged so as to partially intersect with the electric wiring at a peripheral portion of the substrate. in the liquid crystal display panel formed by sandwiching a liquid crystal layer between the pair of substrates, intersection regions between the sealing material of the electrical wiring has a configuration which is formed by ultraviolet-permeable transparent electrode. Accordingly, the sealing material can be cured in a short time in the intersection region between the electric wiring and the sealing material, so that the distortion of the substrate caused by the temperature rise of the substrate due to the irradiation of the ultraviolet rays can be eliminated.

Therefore, it is possible to eliminate the disorder of alignment, insufficient injection of liquid crystal, and the like due to poor curing of the sealing material, thereby eliminating the influence of the sealing material on the pixels and improving the display quality of the liquid crystal display panel. The effect that it can be made to play is produced.

A liquid crystal display panel according to a fourth aspect of the present invention has a structure in which the transparent electrode is formed of indium tin oxide in the liquid crystal display panel according to the third aspect.

Thus, in addition to the effect of the third aspect, when the pixel electrode of the liquid crystal display panel is made of indium tin oxide, the transparent electrode and the pixel electrode are made of the same material. The formation process can be used as it is, and as a result, there is an effect that the manufacturing process can be simplified.

The liquid crystal display panel according to the fifth aspect of the present invention
The liquid crystal display panel according to claim 1, 2, 3, or 4.
At least the other substrate blocks ultraviolet light.
Black matrix is formed, and the black matrix
The trix and the sealing material are arranged so as to overlap.
It is good.

Thus, the first, second, third or fourth aspect of the present invention
The effect is that at least the other substrate is a
Black matrix and black matrix
Applicable even when placed so as to overlap with the sealing material
It has the effect of being able to.

As described above, in the liquid crystal display device according to the sixth aspect of the present invention, a plurality of the liquid crystal display panels according to the first, second, third , fourth or fifth aspect are connected adjacently and arranged on the same plane. Configuration.

As a result, there is an effect that a large-screen display can be performed, and a liquid crystal display device with excellent display quality, in which joint portions between the liquid crystal display panels are inconspicuous, can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a pixel near a joint between liquid crystal display panels constituting a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a liquid crystal display device according to one embodiment of the present invention.

FIG. 3 is a schematic sectional view of a liquid crystal display panel provided in the liquid crystal display device shown in FIG.

FIG. 4 is a schematic plan view of the liquid crystal display device shown in FIG.

FIG. 5 is a schematic plan view of a pixel near a joint between liquid crystal display panels constituting a liquid crystal display device according to another embodiment of the present invention.

FIG. 6 is a schematic plan view of a pixel near a joint between liquid crystal display panels constituting a liquid crystal display device according to still another embodiment of the present invention.

FIG. 7 is a schematic plan view of a pixel near a joint between liquid crystal display panels constituting a conventional liquid crystal display device.

8 is a schematic plan view of a liquid crystal display device including the pixel shown in FIG.

[Explanation of symbols]

1 liquid crystal display panel 2 a liquid crystal display panel 6 sealing material 7 the liquid crystal layer 13 signal electrodes (electrical wiring) 14 scanning electrodes (electrical wiring) 14a thin line portions 15 pixel electrode 16 TFT 20 scanning electrodes (electrical wiring) 20a opening 22 scan electrodes (electrical wiring) 23 transparent electrode

Claims (6)

(57) [Claims] An ultraviolet light is blocked by at least one substrate.
A pair of substrates on which electric wiring made of a material is formed are adhered by a sealing material made of an ultraviolet curable resin or a thermosetting UV curable resin arranged so as to partially intersect the electric wiring at a peripheral portion of the substrate. In a liquid crystal display panel in which a liquid crystal layer is sandwiched between a pair of substrates, the electric wiring has a line width in a region intersecting with the sealing material is larger than a line width in a region not intersecting with the sealing material. A liquid crystal display panel formed so as to be narrow. 2. A UV-curable resin or a UV-curable resin combined with thermosetting, wherein a pair of substrates each having an electric wiring formed on at least one substrate are arranged so as to partially intersect the electric wiring at a peripheral portion of the substrate. In a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of substrates, the electric wiring has an opening formed in a region intersecting with the sealing material. Liquid crystal display panel. 3. Ultraviolet rays are blocked by at least one of the substrates.
A pair of substrates on which electric wiring made of a material is formed are adhered by a sealing material made of an ultraviolet curable resin or a thermosetting UV curable resin arranged so as to partially intersect the electric wiring at a peripheral portion of the substrate. A liquid crystal display panel having a liquid crystal layer sandwiched between the pair of substrates, wherein a crossing area of the electric wiring with the sealing material is formed of a transparent electrode capable of transmitting ultraviolet light. Display panel. 4. The liquid crystal display panel according to claim 3, wherein said transparent electrode is formed of indium tin oxide. 5. An ultraviolet light shielding at least the other substrate.
A black matrix is formed and the black mat
Rix and sealant are arranged so as to overlap
The liquid crystal display according to claim 1, 2, 3, or 4, wherein
panel. 6. The method according to claim 1, 2, 3, 4 or 5.
A plurality of liquid crystal display panels are connected adjacently and arranged on the same plane.
A liquid crystal display device characterized by being placed.