JP2003043462A - Liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of securing uniformity of a liquid crystal cell gap in a method for dropping the liquid crystal and bonding substrates and a method for manufacturing the same. SOLUTION: A light shielding body 302 of the opposite side formed on a peripheral part of an upper side substrate 301 is disposed so as not to overlap a sealing layer 201 provided on a lower side substrate 101.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly to a liquid crystal display device manufactured by a liquid crystal dropping and laminating method and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a manufacturing method for manufacturing a liquid crystal display panel, a liquid crystal vacuum injection method and a liquid crystal dropping bonding method are known. In the liquid crystal vacuum injection method, a pair of substrates are bonded and fired with a sealing layer of thermosetting resin having injection holes to form a so-called empty cell, and then the liquid crystal material is sucked into the empty cell due to the pressure difference from the vacuum state. After this, the injection hole is sealed. In addition, in the liquid crystal dropping bonding method, a pair of substrates are bonded with a seal layer of an ultraviolet curable resin, and ultraviolet light is irradiated,
The seal layer is cured.

In the liquid crystal vacuum injection method mentioned above, the liquid crystal material is sucked up into the empty cell due to the pressure difference, so that in a large-sized liquid crystal display panel, it is difficult for the liquid crystal material to sufficiently spread to a portion far from the injection hole in the panel. Various problems have become remarkable with the increase in size of liquid crystal display panels, such as the time required for siphoning and the tendency for display unevenness to occur in the panel near the injection hole.

Further, with the demand for high-speed response to liquid crystal display devices, narrowing the cell gap has become an important issue. The cell gap is the thickness of liquid crystal sandwiched between two substrates, and the response time is proportional to the square of the cell gap.
For example, a liquid crystal with a cell gap of 4 μm and a cell gap of 3 μm
Comparing the response times of the liquid crystal of m, the cell gap is 3 μm.
The response time of the liquid crystal is 9/16 of the response time of the liquid crystal with a cell gap of 4 μm. However, narrowing the cell gap causes an increase in liquid crystal injection time. As a result of an experiment by the inventor of the present application, it has been found that when the cell gap is halved, the injection time is about five times longer in the liquid crystal vacuum injection method. On the other hand, by using the liquid crystal dropping bonding method, it is possible to solve the problem of increasing the injection time by such a liquid crystal vacuum injection method.

A conventional liquid crystal dropping bonding method will be described with reference to Japanese Patent Application No. 2001-118115. First, the first conventional technique will be described. FIG. 8 is a plan view of a liquid crystal display panel for explaining the first conventional technique. FIG. 9 is an enlarged plan view of section c of FIG. Figure 10
[Fig. 3] is an outline view in order of steps for explaining the liquid crystal dropping bonding method. FIG. 11 is a sectional view taken along the line BB ′ of FIG.

The liquid crystal display device according to the present embodiment has a lower substrate 101 having a display portion 401 and a peripheral portion 402 around the display portion 401, and a liquid crystal layer 203 sandwiched between the lower substrate 101 and the lower substrate 101. A liquid crystal display device having a lower substrate 101 and an upper substrate 301 bonded by a sealing layer 201 formed on a peripheral portion 402 of the side substrate 101, the liquid crystal display device being drawn from a display unit 401 formed on the lower substrate 101. The extracted lead wires 103 and 15 and the light shields 106a and 106b,
106c overlaps with the seal layer 201, and leads wirings 103 and 105 and light shields 106a and 1a.
It is characterized in that the area that does not overlap with 06b and 106c is set to be 25% or more of the sealing layer 201. In the specification of the application, “overlap” means overlapping in a plan view unless otherwise specified.

That is, the lead wirings 103 and 105 and the light shields 106a and 1a that overlap the seal layer 201.
The shape and arrangement of 06b and 106c are modified so that the area below the sealing layer 201 is 25 times the installation area of the sealing layer 201.
% Or more UV light is set to be transmitted. Also,
The interval between the transmissive portions is 80 μm or less. 13 and 14, the critical meanings of "the installation area of the transmission holes is 25% or more" and "the installation intervals of the transmission holes are 80 μm or less" will be described.

The amount of light applied to the sealant alone is 150
It has been confirmed from the experimental results that it cures at 0 mJ / cm ² or more. However, considering the margin, it is at least 200
0 mJ / cm ^{2 is} required. Considering the aperture ratio of the wiring part transmission hole, the amount of light irradiated on the seal itself is given by the following equation, and the respective relationships are as shown in FIG. (Amount of light applied to the seal) = (Amount of irradiation applied to the whole)
× (Aperture ratio of wiring transmission hole) For UV curing, the amount of the seal itself should be 2000 mJ / cm ² in consideration of the margin, and when the aperture ratio is low, the amount of light should be increased accordingly. Should be irradiated. However, in order to shorten the process time and suppress the temperature rise of the substrate due to UV irradiation as much as possible, the amount of light emitted from the UV lamp is preferably 8000 mJ / cm ² or less. From the graph shown in FIG. 13, in order to satisfy the above, it is desired that the aperture ratio of the UV transmission holes is 25% or more. More generally, the product of the amount of UV light irradiated (mJ / cm ² ) and the UV transmission hole is 2000 (mJ / cm ² ).
cm ² ) or more, and the aperture ratio of the UV transmission holes is substantially the same at any position of the seal layer, and is preferably 25% or more. This allows a sufficient and uniform curing of the sealing material.

Next, an experiment was conducted to measure the degree of hardening of the seal portion by changing the distance between the transmission holes. In the experiment, the aperture ratio of the transmission holes is fixed at 25%. The results are shown in FIG.
It can be seen from FIG. 14 that the gap between the transmission holes must be 80 μm or less in order to completely cure the sealing material. Incidentally, even if the aperture ratio is larger than 25%, it can be said that the interval is 80 μm or less in principle.

Summarizing the above curing conditions, the product of the amount of UV light irradiated (mJ / cm ² ) and the UV transmission hole is 20.
00 (mJ / cm ² ) or more, and the aperture ratio of the UV transmission holes is substantially the same at any position of the sealing layer, and 2
It is desirable that the distance between the transmission holes is 5% or more and the distance between the transmission holes is 80 μm or less. This allows a sufficient and uniform curing of the sealing material.

The light shields 106a, 106b, 106 of FIG.
Among c, the light shield 106c will be described as a representative. As shown in FIG. 9, in the c portion of the lower substrate 101, a strip-shaped common voltage supply wiring / light shield 106c is provided. The seal layer 201 for the common voltage supply wiring and the light shield 106c
A plurality of UV transmission holes 601 are formed along the extending direction of the seal layer 201 in the portion overlapping with. A transfer 202 is formed outside the sealing layer 201.

Next, a method of manufacturing the liquid crystal display device of the present embodiment will be described with reference to FIG. In the present embodiment, with respect to the lower substrate having the shape shown in FIG. 1 as described above, (1) in the seal drawing step, the relative position between the dispenser and the lower substrate 101 is changed to be an ultraviolet curing type. The resin has a width of 0.2 to 0.6 in the peripheral portion 402 around the display portion 401.
mm, height 10 to 50 μm and drawn to form an annular seal layer 2
01 is formed. Next, in the (2) liquid crystal dropping / substrate bonding step, the liquid crystal material is dropped onto a region surrounded by the annular seal layer 201 of the lower substrate 101, and spacers are further fixedly formed (fixed spacers). Alternatively, the upper substrate 301 and the lower substrate 101 (column spacers) are pressed by a surface plate while aligning them in a vacuum, and then returned to atmospheric pressure and air-pressed to perform bonding (surface plate). Load 200-3000N). The substrates are turned over in a bonded state, and in the UV irradiation / temporary curing step (3), linear ultraviolet light is collectively irradiated from the lower substrate 101 to the seal layer 201 at 5000 to 8000 mJ / cm ² to cure.

At this time, as shown in FIG. 11 which is a cross-sectional view taken along the line BB 'of FIG. 9, the width is determined at the position corresponding to the seal layer 201 in consideration of the misalignment amount of the alignment. By irradiating through the UV mask 501 having the opening and having the mask pattern 502 which shields the display area of the liquid crystal display panel, ultraviolet light is selectively irradiated only around the seal layer 201. By irradiating through the mask pattern 502, adverse effects such as alteration of the alignment film located in the display area due to ultraviolet light are prevented. Lower substrate 10
The ultraviolet light emitted from 1 through the UV mask 501 is
At the location of the common voltage supply wiring / light shield 106c, the sealing layer 201 is transmitted through the formed UV transmission holes 601.
And the seal layer 201 is cured. Further, the ultraviolet light transmitted through the seal layer 201 is reflected by the counter-side light shield 302 formed on the upper substrate 301, and is again sealed by the seal layer 20.
1 and contributes to the hardening of the seal layer 201. Further, the sealing layer 201 overlapping the plurality of lead wires 103 and 105 can also be irradiated with the ultraviolet light transmitted through the gap between the lead wires to cure the seal layer 201. Further, the seal layer 201 overlapping the common voltage supply wiring / shading member 106a shown in FIG. 3 and the common voltage supply wiring / shading member 106b shown in FIG. The seal layer 201 can be irradiated and cured.

In this way, after the seal layer 201 is temporarily cured, the substrate temperature 120 is set in (4) the curing / main curing step.
The liquid crystal display device is completed by fully hardening the seal layer 201 by heat treatment at 1 ° C. for 1 hour.

According to the first prior art, of the gate lead-out wiring 103 and the drain lead-out wiring 105, the lead-out wiring having a long distance to the gate terminal 102 and the drain terminal 104 has a large width and is adjacent to the lead-out wiring. By widening and setting the interval of, the ultraviolet ray is sufficiently irradiated to the ultraviolet curable resin through the gap between the lead wires, and the seal layer 201 can be sufficiently and uniformly cured. Further, the resistance value of the lead wiring can be kept uniform.

The first conventional technique is to irradiate the lower substrate 101 with ultraviolet light. As is apparent from FIG. 1, the lower substrate 101 has a common voltage supply wiring and light shield 10.
6a, 106b, 106c, and there is always a portion that overlaps with the seal layer 201. Therefore, it is necessary to provide a plurality of UV transmission holes 601 at the overlapping positions. Therefore, there are the following problems.

First, as a problem in the manufacturing process, U
The quality of the V transmission hole 601 differs depending on the manufacturing lot. If the UV transmission hole 601 is too small, the lower substrate 101
The ultraviolet light radiated on the common light source is also a common voltage supply wiring and light shield 106.
Since it is shielded by the light and does not reach the seal layer 201 sufficiently, the ultraviolet light is not sufficiently irradiated to the ultraviolet curable resin, and the components in the resin which are not sufficiently cured are dissolved in the liquid crystal layer to cause display failure. Cause. On the other hand, if the UV transmission hole 601 is too large, the common voltage supply wiring / light shields 106a, 1
The resistances of the scanning lines and drain lines 06b and 106c increase, and horizontal crosstalk and flicker occur due to wiring delay.

That is, there is no problem if a design can be made with a sufficient margin against the contradictory conditions of the aperture ratio of the transmission hole being 25% or more and the wiring resistance having a sufficiently small wiring delay. However, as the liquid crystal display device becomes larger, Meeting these conflicting conditions has become difficult.

As a countermeasure against these problems, the second conventional technique will be described below. The same components as those of the first conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 12 is a sectional view for explaining a second conventional liquid crystal display device. On the upper substrate 301,
A lattice-shaped black stripe is formed in the display portion, and a strip-shaped opposite-side light shield 302 is formed in the periphery of the display portion. The opposite-side light shield 302 and the lower substrate 101 also serve as a common voltage supply wiring / light shield 106. Is opposed to. 12
Then, the black stripe of the display unit and the opposite side light shield 30
2 seems to be separated, but in reality the sealing layer 2
It is desirable from the viewpoint of light leakage prevention that the opposite side light shield 302 on the display unit side of 01 is integrated with the black stripe. The present embodiment is characterized in that a plurality of UV transmission holes 601 are provided in the counter-side light shield 302 provided in the peripheral portion of the upper substrate 301 facing the common voltage supply wiring / light shield 106.

Next, the first conventional manufacturing method will be described. Similar to the first conventional technique, after the upper substrate 301 and the lower substrate 101 are aligned and bonded together, the upper substrate 3
From 02, the seal layer 201 is collectively irradiated with linear ultraviolet light to be cured. As shown in FIG. 12, the sealing layer 201
The UV mask 501 having a mask pattern 502 which has an opening whose width is determined in consideration of the amount of misalignment in alignment and which shields the display area of the liquid crystal display panel from light.
Is disposed on the upper side of the upper substrate 301 to irradiate, so that only the periphery of the seal layer 201 is selectively irradiated with ultraviolet light. The ultraviolet light emitted from the upper substrate 301 through the UV mask 501 passes through the plurality of UV transmission holes 601 formed in the opposite-side light shield 302 and is applied to the seal layer 201 to cure the seal layer 201. Furthermore, the sealing layer 20
The ultraviolet light that has passed through 1 is reflected by the common voltage supply wiring / shading body 106 of the lower substrate 101 and the extraction wiring, enters the sealing layer 201 again, and contributes to the curing of the sealing layer 201.
In this way, after the seal layer 201 is temporarily cured, the seal layer 201 is finally cured by heat treatment, and the liquid crystal display device is completed.

According to the second conventional technique, the opposite side light shield 3
The ultraviolet curing resin is transmitted through the plurality of UV transmission holes 602 provided in No. 02, so that the sealing layer 201 can be sufficiently cured, and the irradiation amount of the ultraviolet light in the sealing layer 201 is entirely. As a result, the seals can be made uniform and the curing status of the seals can be made uniform, and display defects due to defective curing can be prevented. Moreover, unlike the UV transmission hole 601 provided in the common voltage supply wiring / light-shielding body 106 of the lower substrate 101, the problem of wiring resistance does not occur even if the aperture ratio of the UV transmission hole 601 is increased. Therefore, the aperture ratio can be set to a value with a sufficient margin in consideration of the variation in the quality of the UV transmission hole 201 depending on the manufacturing lot.

[0023]

In the liquid crystal dropping bonding method, it is difficult to finely control the amount of liquid crystal to be injected, and thus it is difficult to control the cell gap of the liquid crystal. When the amount of injected liquid crystal is large, there is a problem that the peripheral cell gap becomes larger than the central cell gap. When the cell gap becomes uneven, display unevenness occurs. In particular, when the cell gap is narrow, display unevenness occurs even if the cell gap is slightly uneven. As the cell gap becomes narrower, the nonuniformity of the cell gap has become a new issue.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device and a manufacturing method thereof which can ensure the uniformity of liquid crystal cell gaps in a liquid crystal dropping bonding method. Is to provide.

[0025]

A liquid crystal display device according to a first aspect of the present invention for solving the above problems is a lower substrate having a display portion and a peripheral portion around the display portion, and the lower substrate. A liquid crystal display device comprising: a lower substrate and an upper substrate bonded to each other with a sealing layer formed between the lower substrate and a liquid crystal layer sandwiched between the lower substrate and the upper substrate. The lead-out wiring drawn out from the display portion formed on the light-shielding body and the light-shielding body overlap with the seal layer, and the seal layer in the seal layer has a regular region that does not overlap with the lead-out wiring and the light-shielding body. And the distance between the area not overlapping the lead-out wiring and the light shield is 80 μm or less.

By regularly arranging the region of the seal layer where the seal layer does not overlap with the lead wiring and the light shield, it is possible to prevent the cell gap of the liquid crystal from becoming nonuniform. Further, by setting the distance between the lead-out wiring and the region that does not overlap with the light shield to 80 μm or less, UV light is sufficiently irradiated to the seal layer, and the components in the resin of the seal layer are melted into the liquid crystal layer and displayed. It can be prevented from becoming defective.

According to a second aspect of the present invention to solve the above problem, a liquid crystal display device according to the present invention has a liquid crystal layer between a lower substrate having a display section and a peripheral portion around the display section and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded to each other with a sealing layer sandwiched and formed in the peripheral portion of the lower substrate, wherein the light shield is formed in the peripheral portion of the lower substrate. Overlap with the seal layer, a plurality of transmission holes are regularly arranged in a region where the lower substrate overlaps with the seal layer, and a distance between the plurality of transmission holes is 80 μm or less. It is characterized by

By arranging a plurality of through holes regularly in the region where the lower substrate overlaps with the sealing layer,
It prevents the cell gap of the liquid crystal from becoming non-uniform.

According to a third aspect of the present invention for solving the above-mentioned problems, in the liquid crystal display device of the present invention, the counter-side light shield formed in the peripheral portion of the upper substrate overlaps with the seal layer, A region of the seal layer where the seal layer and the opposite-side light shield do not overlap is regularly arranged.

The cell gap of the liquid crystal is prevented from becoming nonuniform by regularly arranging the regions in the seal layer where the seal layer and the light shield on the opposite side do not overlap each other.

In the liquid crystal display device of the present invention according to claim 4 for solving the above-mentioned problems, the sealing layer is completely covered by a light shield on the opposite side formed in the peripheral portion of the upper substrate. Is characterized by.

It is possible to prevent the liquid crystal cell gap from becoming non-uniform by completely overlapping the opposite side light shield with the seal layer.

A fifth aspect for solving the above-mentioned problems.
The liquid crystal display device according to the present invention is characterized in that the counter-side light shield formed in the peripheral portion of the upper substrate does not overlap with the seal layer.

Since the light shield on the opposite side does not overlap the seal layer, the cell gap of the liquid crystal is prevented from becoming nonuniform.

In the liquid crystal display device of the present invention according to claim 6 for solving the above-mentioned problems, the counter-side light shield formed in the peripheral portion of the upper substrate is separated from the boundary of the seal layer on the display unit side. The width of the cell gap of the liquid crystal or the width of the cell gap is twice as wide as the cell gap, and the liquid crystal overlaps with the sealing layer only in a region extending to the peripheral portion.

By overlapping the light shield on the opposite side with the seal layer only at a cell gap width to a width twice the cell gap, both the nonuniformity of the cell gap of the liquid crystal and the light leakage countermeasure are achieved.

According to a seventh aspect of the present invention to solve the above-mentioned problems, a liquid crystal display device according to the present invention has a liquid crystal layer between a lower substrate having a display portion and a peripheral portion around the display portion and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded to each other with a sealing layer sandwiched and formed in the peripheral portion of the lower substrate, the counter side light shield formed in the peripheral portion of the upper substrate. A body overlaps with the seal layer, and the seal layer in the seal layer is regularly arranged in a region that does not overlap with the opposing light-shielding body,
The distance between the regions that do not overlap the opposite-side light shield is 80 μm or less.

By regularly arranging a region of the seal layer where the seal layer does not overlap with the light shield on the opposite side, it is possible to prevent the cell gap of the liquid crystal from becoming nonuniform. By setting the distance between the regions that do not overlap the opposite-side light shields to 80 μm or less, UV light is sufficiently irradiated to the seal layer, and the components in the resin of the seal layer dissolve into the liquid crystal layer, resulting in display failure. Can be prevented.

According to an eighth aspect of the present invention for solving the above-mentioned problems, a liquid crystal display device according to the present invention has a liquid crystal layer between a lower substrate having a display portion and a peripheral portion around the display portion and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded to each other with a sealing layer sandwiched and formed in the peripheral portion of the lower substrate, the counter side light shield formed in the peripheral portion of the upper substrate. The body overlaps the seal layer, and a plurality of transmission holes are regularly arranged in a region where the upper substrate overlaps the seal layer, and a distance between the plurality of transmission holes is 80 μm or less. Is characterized by.

By regularly arranging a plurality of perforations in the region where the upper substrate overlaps the sealing layer,
It prevents the cell gap of the liquid crystal from becoming non-uniform.

According to a ninth aspect of the present invention for solving the above-mentioned problems, a liquid crystal display device according to the present invention has a liquid crystal layer between a lower substrate having a display portion and a peripheral portion around the display portion and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded to the lower substrate with a sealing layer formed between the lower substrate and a peripheral portion of the lower substrate, wherein a region of the upper substrate that overlaps with the sealing layer is It is characterized in that no light shield is provided.

By providing no light shield in the region of the upper substrate which overlaps with the seal layer, it is possible to prevent the cell gap of the liquid crystal from becoming non-uniform.

According to a tenth aspect of the present invention for solving the above-mentioned problems, in the liquid crystal display device of the present invention, the lead-out wiring and the light shield drawn from the display portion formed in the peripheral portion of the lower substrate are the seals. It is characterized in that it overlaps with a layer, and in the seal layer, a region where the seal layer does not overlap with the lead wiring and the light shielding body is regularly arranged.

It is possible to prevent the cell gap of the liquid crystal from becoming nonuniform by regularly arranging the region of the seal layer where the seal layer does not overlap with the lead wiring and the light shield of the lower substrate.

According to an eleventh aspect of the present invention for solving the above-mentioned problems, a liquid crystal display device according to the present invention has a liquid crystal layer between a lower substrate having a display portion and a peripheral portion around the display portion and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded to each other with a sealing layer sandwiched and formed in the peripheral portion of the lower substrate, the counter side light shield formed in the peripheral portion of the upper substrate. The body overlaps with the seal layer only in a region extending from the boundary of the seal layer on the display unit side to the width of the liquid crystal cell gap or twice the cell gap, the peripheral portion. Characterize.

By overlapping the light shield on the opposite side with the seal layer only at a cell gap width to a width twice the cell gap, both the nonuniformity of the cell gap of the liquid crystal and the light leakage countermeasure are achieved.

According to a twelfth aspect of the present invention for solving the above-mentioned problems, the liquid crystal display device of the present invention is characterized in that the opposite-side light shield is an organic film.

When the light shield on the opposite side is an organic film, the effect of the present invention is great.

The liquid crystal display device of the present invention according to claim 13 for solving the above-mentioned problems is characterized in that an organic film is formed on said lower substrate and said organic film does not overlap with said seal layer. And

By preventing the organic film from overlapping the seal layer, it is possible to prevent the cell gap of the liquid crystal from becoming non-uniform.

According to a fourteenth aspect of the present invention for solving the above-mentioned problems, the liquid crystal display device is characterized in that the liquid crystal display device is a horizontal electric field mode liquid crystal display device.

In the lateral electric field mode, the effect of the present invention is great.

According to a fifteenth aspect of the present invention for solving the above-mentioned problems, a method of manufacturing a liquid crystal display device according to the present invention forms a seal layer on the peripheral portion of a lower substrate having a display portion and a peripheral portion around the display portion. A step of dropping a liquid crystal material on a region of the lower substrate surrounded by the seal layer and adhering the liquid crystal material to an upper substrate with the seal layer; and irradiating the seal layer with light to cure the seal layer. A method of manufacturing a liquid crystal display device including: a light-shielding body, which is formed in the peripheral portion of the lower substrate and drawn from a display portion, overlaps with the seal layer; A region where the sealing layer does not overlap the lead wiring and the light shield is regularly arranged, and the distance between the lead wiring and the region not overlapping the light shield is 80 μm or less. And wherein the Rukoto.

According to a sixteenth aspect of the present invention for solving the above-mentioned problems, there is provided a method for manufacturing a liquid crystal display device according to the present invention, wherein a plurality of transmission holes are regularly formed in a region where the lead wiring and the light shield overlap the seal layer. And is arranged so that light for curing the sealing layer is irradiated from the lower substrate side.

According to a seventeenth aspect of the present invention for solving the above-mentioned problems, a method of manufacturing a liquid crystal display device according to the present invention forms a seal layer on the peripheral portion of a lower substrate having a display portion and a peripheral portion around the display portion. A step of dropping a liquid crystal material on a region of the lower substrate surrounded by the seal layer and adhering the liquid crystal material to an upper substrate with the seal layer; and irradiating the seal layer with light to cure the seal layer. A method of manufacturing a liquid crystal display device, comprising: the counter side light shield formed in the peripheral portion of the upper substrate overlapping the seal layer; and the seal layer overlapping the counter side light shield. Areas that do not overlap are regularly arranged, and the distance between the areas that do not overlap the lead wiring and the light shield is 80 μm.
It is characterized by being m or less.

According to a method for manufacturing a liquid crystal display device of the present invention according to claim 18 for solving the above-mentioned problems, a plurality of transmission holes are regularly formed in a region where the opposite side light-shielding body overlaps with the seal layer. It is arranged, and light for curing the sealing layer is irradiated from the upper substrate side.

According to a nineteenth aspect of the present invention for solving the above-mentioned problems, a method of manufacturing a liquid crystal display device according to the present invention forms a seal layer on the peripheral portion of a lower substrate having a display portion and a peripheral portion around the display portion. A step of dropping a liquid crystal material on a region of the lower substrate surrounded by the seal layer and adhering the liquid crystal material to an upper substrate with the seal layer; and irradiating the seal layer with light to cure the seal layer. A method of manufacturing a liquid crystal display device comprising: a counter light-shielding body formed in the peripheral portion of the upper substrate, the sealing layer not being overlapped, and curing the sealing layer from the upper substrate side. It is characterized by irradiating light.

Since the ratio of the area where the seal layer does not overlap the opposite-side light-shielding body to the unit area of the seal layer is substantially the same at any place, the cell gap of the upper substrate and the lower substrate is made equal to that of the seal layer. It can be made uniform at any place. The ratio of non-overlapping area to the unit area of the seal layer is 100%
Alternatively, it is particularly desirable to set it to 0%.

According to a ninth aspect of the present invention for solving the above-mentioned problems, a liquid crystal display device of the present invention has a liquid crystal layer between a lower substrate having a display portion and a peripheral portion around the display portion and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded together with a sealing layer sandwiched and formed in the peripheral portion of the lower substrate, the opposite side being formed in the peripheral portion of the upper substrate. The light-shielding body overlaps the seal layer, and an area not overlapping the opposite-side light-shielding body is 25% or more with respect to a unit area of the seal layer.

By selecting the aperture ratio of the UV transmission holes to be 25% or more, the sealing layer can be sufficiently UV-cured, so that the components in the resin of the sealing layer which have not been sufficiently cured are dissolved in the liquid crystal layer. It is possible to prevent the display failure from occurring.

According to a tenth aspect of the present invention for solving the above-mentioned problems, a liquid crystal display device according to the present invention is characterized in that a distance between regions which do not overlap with the opposite-side light-shielding body is 80 μm or less.

The aperture ratio of the UV transmission hole is selected to be 25% or more,
In addition, by setting the distance between the lead-out wiring and the area that does not overlap with the light-shielding body to 80 μm or less, U
It is possible to prevent the V-light from being sufficiently irradiated on the seal layer, thereby preventing the components in the resin of the seal layer from dissolving into the liquid crystal layer and resulting in display failure.

In the liquid crystal display device according to the present invention according to claim 11 for solving the above-mentioned problems, a plurality of transmission holes are provided along the seal layer in the opposite side light shield in a portion overlapping with the seal layer. It is characterized by having.

By forming a plurality of transmission holes in the light shield in the portion overlapping the seal layer along the direction in which the seal layer extends, the aperture ratio of the UV transmission holes is 25% or more, and the lead wiring and The distance between the light shield and the non-overlapping area can be set to 80 μm or less,
The sealing layer can be cured sufficiently uniformly.

According to a twelfth aspect of the present invention for solving the above-mentioned problems, a liquid crystal display device according to the present invention has a liquid crystal layer between a lower substrate having a display portion and a peripheral portion around the display portion and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded together with a seal layer formed between the lower substrate and a sealing layer sandwiched between the lower substrate and a region opposite to the seal layer. It is characterized in that no light shield is provided.

By providing no light shield in the region of the upper substrate facing the seal layer, the seal layer can be sufficiently and uniformly cured even with a low irradiation light amount of UV light.

According to a thirteenth aspect of the present invention for solving the above-mentioned problems, in the liquid crystal display device of the present invention, the lead wiring and the light shield formed in the peripheral portion of the lower substrate and drawn from the display portion are the sealing layers. And the area not overlapping the lead-out wiring and the light-shielding body is substantially the same at any place in the unit area of the sealing layer.

The ratio of the area of the seal layer formed on the peripheral portion of the lower substrate, which does not overlap with the lead-out wiring and the light shield drawn from the display section, to the unit area of the seal layer is substantially the same at any place. By so doing, the cell gap between the upper substrate and the lower substrate can be made uniform at any position of the sealing layer. It is particularly desirable to set the ratio of the non-overlapping area to the unit area of the seal layer to 0%.

According to a fourteenth aspect of the present invention for solving the above-mentioned problems, a liquid crystal display device according to the present invention has a liquid crystal layer between a lower substrate having a display portion and a peripheral portion around the display portion and the lower substrate. A liquid crystal display device having a lower substrate and an upper substrate bonded with a seal layer formed in the peripheral portion of the lower substrate by sandwiching, in a region facing the seal layer of the upper substrate, The opposite-side light shield is provided in a range from the display-side boundary of the region to a width of a cell gap between the upper substrate and the lower substrate to a width twice the width of the cell gap. To do.

In a region facing the seal layer of the upper substrate, the opposite-side light shield is provided in a range from the display side boundary of the region to X, and the cell gap between the upper substrate and the lower substrate is a. , A ≦ X ≦ 2a, it is possible to prevent defective display near the seal portion due to light leakage.

The liquid crystal display device of the present invention according to claim 15 for solving the above-mentioned problems is characterized in that an organic film is formed on said lower substrate, and said organic film does not overlap with said seal layer. And

The organic film formed on the lower substrate is shown in plan view,
By not overlapping with the sealing layer, the cell gap between the upper substrate and the lower substrate can be made uniform at any position of the sealing layer. Since the organic film has poor adhesion to the seal layer, it is not desirable to completely overlap the seal layer with the organic film.

According to a sixteenth aspect of the present invention for solving the above-mentioned problems, the liquid crystal display device according to the present invention is provided with a vernier composed of a graduation made of a transmission hole and a numeral in the light shield of the lower substrate. It is characterized by

By forming a vernier composed of graduations and numerals composed of transmission holes on the light-shielding body of the lower substrate,
When irradiated with UV light, the seal layer is irradiated with ultraviolet light through the graduations and numbers made up of vernier transmission holes, and the seal layer can be sufficiently cured.
The irradiation amount of V light can be made more uniform as a whole, the cured state of the seal can be made uniform, and display defects due to defective curing can be prevented.

According to a seventeenth aspect of the present invention for solving the above-mentioned problems, the liquid crystal display device is characterized in that the liquid crystal display device is a horizontal electric field mode liquid crystal display device.

The horizontal electric field mode liquid crystal is particularly suitable for a large liquid crystal due to its characteristics of wide viewing angle and high-speed halftone response. Also,
A narrow cell gap is especially important for moving images, and a shortening of liquid crystal injection time is especially required. For these reasons, the present invention is a technique particularly required for the in-plane switching mode liquid crystal.

According to an eighteenth aspect of the present invention for solving the above-mentioned problems, a method of manufacturing a liquid crystal display device according to the present invention forms a seal layer on the peripheral portion of a lower substrate having a display portion and a peripheral portion around the display portion. A step of dropping a liquid crystal material on a region of the lower substrate surrounded by the seal layer and adhering the liquid crystal material to an upper substrate with the seal layer; and irradiating the seal layer with light to cure the seal layer. A method of manufacturing a liquid crystal display device including: a lead wiring formed on the peripheral portion of the lower substrate and drawn from a display portion and a light shield overlap the sealing layer; Also, the area not overlapping the light shield is selected to be 25% or more with respect to the unit area of the seal layer.

Further, claim 1 for solving the above-mentioned problems
According to a ninth aspect of the present invention, in the method for manufacturing a liquid crystal display device of the present invention, a plurality of transmission holes are provided along the sealing layer in the light shielding body at a portion overlapping with the sealing layer, and from the lower substrate side, It is characterized by irradiating light for curing the seal layer.

According to a twentieth aspect of the present invention for solving the above-mentioned problems, a method of manufacturing a liquid crystal display device according to the present invention forms a sealing layer on the peripheral portion of a lower substrate having a display portion and a peripheral portion around the display portion. A step of dropping a liquid crystal material on a region of the lower substrate surrounded by the seal layer and adhering the liquid crystal material to an upper substrate with the seal layer; and irradiating the seal layer with light to cure the seal layer. A method of manufacturing a liquid crystal display device having, wherein a counter light shield formed in the peripheral portion of the upper substrate overlaps with the seal layer,
The area which does not overlap with the opposed light-shielding member is selected to be 25% or more with respect to the unit area of the seal layer.

According to a twenty-first aspect of the invention for solving the above-mentioned problems, in the method for manufacturing a liquid crystal display device according to the present invention, a plurality of transmissions are made along the seal layer in the counter light-shielding body in a portion overlapping with the seal layer. A hole is provided, and light for curing the sealing layer is irradiated from the upper substrate side.

By forming a transparent hole having an aperture ratio of 25% or more in the light shielding body of the lower substrate or the upper substrate which overlaps with the seal layer, and irradiating the substrate side having the transparent hole with light for curing the seal layer. The seal layer can be sufficiently UV-cured, and it is possible to prevent a component in the resin of the seal layer, which has not been sufficiently cured, from being dissolved into the liquid crystal layer to cause display failure.

According to a twenty-second aspect of the present invention for solving the above-mentioned problems, a method of manufacturing a liquid crystal display device according to the present invention forms a seal layer on the peripheral portion of a lower substrate having a display portion and a peripheral portion around the display portion. A step of dropping a liquid crystal material on a region of the lower substrate surrounded by the seal layer and adhering the liquid crystal material to an upper substrate with the seal layer; and irradiating the seal layer with light to cure the seal layer. A method of manufacturing a liquid crystal display device comprising: a counter light-shielding body formed in the peripheral portion of the upper substrate, the sealing layer not being overlapped, and curing the sealing layer from the upper substrate side. It is characterized by irradiating light.

By preventing the opposing light shield formed on the peripheral portion of the upper substrate from overlapping the seal layer, the seal layer can be sufficiently and uniformly cured even with a low irradiation light amount of UV light.

[0084]

BEST MODE FOR CARRYING OUT THE INVENTION While the inventors of the present invention are conducting an experiment for narrowing the cell gap by the liquid crystal dropping bonding method, the problem of non-uniformity of the liquid crystal cell gap is related to the light shielding layer provided on the upper substrate. I understand. Therefore, the following experiment was conducted.

1 to 3 are sectional views showing the vicinity of the seal layer of the liquid crystal display device used in the experiment. 1 to 3 have the same configuration except the configuration of the opposite-side light shield 302.
1 to 3 show a horizontal electric field mode liquid crystal display device. The horizontal electric field mode is used because in the horizontal electric field mode, display unevenness due to the nonuniform cell gap of the liquid crystal is more likely to occur than in the vertical electric field mode.

A cross-sectional view of a horizontal electric field mode liquid crystal display device will be described. As shown in FIG. 1, the lower substrate 101 is provided with a common voltage supply wiring and a light shield 106 in its display portion 401 and its peripheral portion 402. And a gate insulating film 107a and a passivation film 107b are formed thereon.
An organic film 304 is formed on it. The organic film is used as an interlayer insulating film between wiring layers. Since the dielectric constant of the organic film is lower than that of the inorganic film, the dielectric constant of the entire interlayer insulating film can be lowered. In addition, the organic film is easier in the process of forming the interlayer insulating film than the inorganic film. For this reason, for example, it is used as an interlayer insulating film between a data line of a horizontal electric field mode liquid crystal display device and a common electrode made of a transparent metal so as to cover the data line.

The common voltage supply wiring / light-shielding body 106 is provided with band-shaped or lattice-shaped UV transmission holes 601 in the range where it overlaps with the seal layer 201 and secures an aperture ratio of 25% or more.

On the upper substrate 301, the counter side light shield 302 is formed on the display portion 401, and the overcoat layer 403 is formed thereon. (In FIGS. 2 and 3, the opposite-side light shield 302 extends to the peripheral portion 402) Peripheral portion 40
In the case of the two vertical electric field mode liquid crystal display device, the counter electrode 303 is formed instead of the overcoat layer 403. The substrate 1 is omitted in FIGS. 1 to 3 for simplification.
An alignment film is provided on the surface where 01 and 301 are in contact with the liquid crystal layer 203. The alignment film may be installed in the range of the display portion 401. Similarly, although not shown, the substrate 10
A polarizing plate is installed on the side opposite to the liquid crystal layers 203 of Nos. 1 and 301. The polarizing plate is not only the display unit 401 but also the peripheral unit 4
It covers up to the range of the 02 sealing layer.

On the upper substrate 301, a lattice-shaped black stripe is formed in the display section 401, and the opposite side light shield 302 of the peripheral portion 402 around the display section 401 is formed integrally with the black stripe. (However, in FIG.
2 does not have the opposite-side light shield 302. ) In this application, the black stripe is also referred to as the opposite-side light shield 302 because it is integrally formed. Although not shown, the lower substrate 10
1 and the upper substrate 301 are bonded to each other with the seal layer 201 in the peripheral portion 402 with the spacers and the liquid crystal layer 203 scattered on the display portion 401 interposed therebetween. In the lateral electric field mode, the transfer electrode 202 is not formed because the counter electrode 303 is not provided on the upper substrate 301.

In FIG. 1, the opposite side light shield 302 is the display unit 4
01, and does not overlap with the sealing layer 201. In FIG. 2, the opposite-side light shield 302 completely overlaps not only the display unit 401 but also the seal layer 201, and is installed on the entire upper substrate 301. Figure 3
Then, the opposite-side light shield 302 overlaps not only the display section 401 but also about half of the seal layer 201.

Three types of such liquid crystal display devices were prepared, and the sealing layer 201 was cured by irradiating the sealing layer 201 with UV light through the UV transmission holes 601 of the lower substrate 101.

As a result of the experiment, the following was found. In a region of the upper substrate 301 that overlaps with the seal layer 201, if the opposite-side light shield 302 is partially provided in the region, nonuniform cell gap of liquid crystal is likely to occur. (Experimental results with the configuration of FIG. 3) When the opposite side light shield 302 is provided in the entire region of the upper substrate 301 that overlaps with the sealing layer 201, the cell gap nonuniformity of liquid crystal is less likely to occur than in the case of (1), It occurs at some frequency. (Experimental Results with the Configuration of FIG. 2) In the region of the upper substrate 301 that overlaps with the seal layer 201, if the opposite-side light shield 302 is not provided at all in the region, the nonuniform cell gap of the liquid crystal hardly occurs. (Experimental results with the configuration of FIG. 1) As a result of consideration based on the above results, the following reasoning was obtained. The opposite-side light shield 302 of the upper substrate 301 is an organic film having a film thickness of about 1 μm. On the other hand, the light shield 106 of the lower substrate 101 is a metal film having a film thickness of about 0.2 μm. The light shield 10 of the lower substrate 101 using a metal having a relatively thin film thickness and rigidity.
Even if 6 overlaps with the seal layer 201, the nonuniform cell gap of the liquid crystal hardly occurs. The film thickness is relatively thick,
Opposite-side light shield 30 of upper substrate 301 using organic film
When 2 partially overlaps with the sealing layer 201,
The cell gap of the liquid crystal becomes uneven. In this state, if the UV irradiation / temporary curing process is performed by collectively irradiating and curing,
The cell gap of the liquid crystal in the portion where the seal layer 201 and the opposite-side light shield 302 overlap is widened, and the cell gap of the liquid crystal in the portion where the seal layer 201 and the opposite-side light shield 302 do not overlap is narrow. In the case of FIG. 3, the cell gap becomes wide on the right side (display side) of the seal layer 201, and
On the left side of 01 (the side opposite to the display side), the cell gap becomes narrow. When the opposite-side light shield 302 of the upper substrate 301, which has a relatively large film thickness and uses an organic film, entirely overlaps with the seal layer 201, the cell gap of the liquid crystal is nonuniform as compared with the case where it partially overlaps. However, since the opposite-side light shield 302 is thick, the film thickness may have a step, and the cell gap of the liquid crystal may be nonuniform due to the step. Therefore, if the organic film having the permeation holes is regularly provided over the entire region of the upper substrate 301 that overlaps with the sealing layer 201, the result close to the case where the region completely overlaps, that is, FIG. It is considered that the cell gap nonuniformity is likely to occur when compared with each other, but the cell gap nonuniformity is less likely to occur compared to FIG. In (3), in the case of "having regular transmission holes", if the period is large, the cell gap becomes partially non-uniform, and thus the cell gap non-uniformity is likely to occur. Considering how much periodicity is required, it is considered to be similar to the spacing between the transmission holes shown in FIG. This is because it is considered that the seal hardening varies depending on the period of the transmission holes of the opposite-side light shield. Therefore, it is necessary that the distance between the transmission holes of the opposite-side light shield is 80 μm or less.

Based on the above reasoning, the following conclusions were obtained. Whether the seal layer 201 is irradiated with light for curing the seal layer from the lower substrate side or the seal substrate 201 is irradiated with light for curing the seal layer from the upper substrate side, in the region overlapping the seal layer 201 of the upper substrate 301, Opposite-side light shield 302
It is desirable not to provide at all. (First embodiment: FIG. 1) As a suboptimal measure, when irradiating light for curing the sealing layer from the lower substrate side, in the region where the sealing layer 201 of the upper substrate 301 overlaps, the region is completely covered. It is desirable to provide the opposite-side light shield 302 so as to cover.
(Second Embodiment: FIG. 2) As a suboptimal measure, both when irradiating light for curing the seal layer from the lower substrate side and irradiating light for curing the seal layer from the upper substrate side, In a region of the upper substrate 301 that overlaps with the seal layer 201, a counter-side light shield 302 is provided in the region, the counter-side light shield is regularly provided with transmission holes, and the distance between the transmission holes is 80 μm or less. Is desirable. (Third embodiment: not shown) Here, a manufacturing process of the lower substrate 101 will be described.
First, a molybdenum-tungsten (MoW) film having a thickness of 300 nm is formed on an insulating transparent substrate made of glass or the like by a sputtering method. Then, the scanning line, the conductive pattern of the common voltage supply wiring / light-shielding body 106, and the like are formed into a predetermined shape by photo-etching. This is called a G layer metal wiring.

Next, a gate insulating film 107a such as silicon oxide (SiOx) or silicon nitride (SiNx) having a film thickness of 350 nm and 50 nm, respectively, is formed of amorphous silicon (a-S) which becomes the channel region of the thin film transistor.
i) A film is formed by CVD to a film thickness of 50 nm. Further, after forming an etching protection film of silicon nitride with a film thickness of 310 nm by the CVD method, only this protection film is formed into a predetermined shape by the photo-etching method.

Further, an n ⁺ type amorphous silicon film is formed to a thickness of 50 nm by the CVD method. After this,
The amorphous silicon film is formed into a predetermined shape together with the n ⁺ -type amorphous silicon film, and further, an ITO (Indium Tin Oxide) film is formed as a pixel electrode with a film thickness of 40 nm by sputtering, and then a predetermined photo etching method is performed. The shape is processed.

Next, the connection terminals for the scanning lines are
It is formed into a predetermined shape by an etching method. In addition, aluminum (Al) is sputtered 450
A film having a thickness of nm is formed, and is formed into a predetermined shape by photo etching.

Finally, a silicon nitride (SiNx) passivation film 107b is formed to a film thickness of 200 nm by a CVD method, and is formed by a photo-etching method to form an organic film 304. Complete.

In such a lower substrate 101, a seal for sandwiching a liquid crystal layer with the upper substrate 301 is provided around the display unit 401 in which a large number of pixel electrodes are arranged in a matrix. The layer 201 is provided so as to surround the display portion 401. In the case of the liquid crystal of the vertical electric field mode, in addition to this, the transfer 202 used for electrical connection with the upper substrate 301 and the transfer 202.
And lead-out wirings 103 and 105 for electrically connecting between the external connection terminals 102 and 104, respectively. (Transfer 202, terminal 10 for external connection
See FIG. 8 for the reference numerals 2, 104 and the lead wires 103, 105. During the trial manufacture according to the first embodiment, it was found that the organic film 304 formed on the lower substrate 101 also affects the uniformity of the cell gap of the liquid crystal. The inorganic film has good adhesion to the seal layer 201, but the organic film has poor adhesion to the seal layer 201. In FIG. 2, the overcoat layer 40 is formed on the opposite side light shield 302.
3 is formed, and the overcoat layer 403 is the direct seal layer 2
It is configured such that the opposite-side light shield 302 and the seal layer 201 do not directly adhere to each other by closely adhering with 01. This is because the organic film has poor adhesion to the seal layer 201. Therefore, when the organic film 304 is provided on the lower substrate as shown in FIGS. 1 to 3, it is desirable that the organic film 304 does not overlap the seal layer 201 in plan view.

In the embodiment of FIG. 1, in the region of the upper substrate 301 that overlaps with the seal layer 201, the opposite side light shield 302 is not provided at all in the region, so the light leakage of the backlight light to the display unit 401 is prevented. Need to consider. 4 is the same as FIG. 1 except for the installation position of the opposite side light shield 302.
Is exactly the same as

As shown in FIG. 4, in the region of the upper substrate 301 which overlaps with the seal layer 201, the counter-side light shield 302 is provided in the region from the boundary of the seal layer 201 on the display unit side to X μm in the region. Assuming that it is possible to prevent a display defect in the vicinity of the seal part due to light leakage of the backlight light, what value of X can prevent the display defect due to the light leakage of the backlight light. Confirmed by experiment. The result is shown in FIG.

FIG. 5 shows the relationship between the light leakage of the backlight and the projection amount X of the opposite-side light shield 302, obtained by an experiment. The four graphs show the cell gaps of the liquid crystal between the lower substrate 101 and the upper substrate 301 as 2, 3, 4, and 5.
The relative value of the light leakage level to the display when changed to μm is shown. When the light leakage level is 5 or less (indicated by a thick solid line), no light leakage can be recognized by subjective evaluation. Further, when the light leakage level is 12 or less (displayed by a thick dotted line), the light leakage can hardly be recognized in the subjective evaluation. The following can be said from the result of FIG. By providing the overhanging amount X of the opposite-side light shield 302 to be equal to or larger than the cell gap, light leakage is almost eliminated. By providing the amount X of protrusion of the opposite-side light shield 302 at least twice the cell gap, light leakage is completely eliminated.

When irradiating light for hardening the seal layer from the lower substrate side, it is desirable that the opposite side light shield 302 is not provided in the portion of the upper substrate 301 overlapping the seal layer 201 as described above. . However, if the opposite-side light shield 302 is not provided, light leakage through the lower substrate 101 of the backlight occurs near the periphery of the display unit. Therefore, the opposite-side light-shielding member 302 having the protrusion amount X is provided outside the display unit.
It is desirable to arrange. If the cell gap of the liquid crystal is a, then a ≦ X ≦ 2a.

As shown in FIG. 4, the display section 401 and the peripheral section 40
By extending the opposite-side light shield 302 from the boundary of 2 to the peripheral portion side by the width of the cell gap to twice the width of the cell gap, light leakage of the backlight to the display portion can be prevented. Moreover, even if the strip-shaped opposite-side light shield 302 having such a width overlaps the sealing layer 201, the width of the sealing layer 201 on the plan view is usually 1 to 2 mm, so that the cell gap nonuniformity of the liquid crystal is reduced. Not much to happen. This is the fourth embodiment. However, if a lattice-shaped black stripe having a predetermined width is provided on the display unit 401, the strip-shaped opposite-side light shield 302 is attached to the seal layer 2.
01 does not need to overlap.

FIG. 6 shows a sectional view of the vicinity of the seal layer of the liquid crystal display device of the fifth embodiment. Although the configuration is exactly the same as that of FIG. 1, UV for curing the seal layer from the upper substrate 301 side is used.
The only difference is that light is emitted. However, the lower substrate 1
The UV transmission hole 601 provided in the common voltage supply line 01 and the light shield 106 is not necessary. Rather, it is possible to reduce the wiring resistance and to further reflect the UV light emitted from the upper substrate 301 side by the common voltage supply wiring / shading body 106 of the lower substrate 101 because there is no UV transmission hole. Therefore, it is advantageous for curing the seal layer 201. This is referred to as a sixth embodiment, and FIG. 7 shows a sectional view of the vicinity of the seal layer of the liquid crystal display device of the sixth embodiment.

Next, application of the present invention to a liquid crystal in the horizontal electric field mode will be described. The horizontal electric field mode liquid crystal has a slower response speed in a high applied voltage region, that is, a binary mode than the vertical electric field mode liquid crystal, but has a high response speed in a low applied voltage region, that is, a halftone mode. Generally, the response time of a liquid crystal in the longitudinal electric field mode at a low applied voltage is four times the response time at a high applied voltage, but the response time of a liquid crystal in the lateral electric field mode at a low applied voltage is the response time at a high applied voltage. It is double. Therefore, the horizontal electric field mode liquid crystal is more suitable than the vertical electric field mode liquid crystal for displaying moving images in gradation display. In addition, the horizontal electric field mode liquid crystal has a wider viewing angle than the vertical electric field mode liquid crystal and is therefore suitable for a large monitor. Therefore, the horizontal electric field mode liquid crystal is suitable for a large-sized monitor or a television that will support moving images in the future. In the horizontal electric field mode liquid crystal, it is essential to narrow the cell gap in order to achieve high-speed response. Moreover,
As described above, since the response time at a low applied voltage is twice as long as the response time at a high applied voltage, the effect of speeding up the gray scale display by narrowing the cell gap is larger than that of the liquid crystal in the vertical electric field mode.

From the above reasons, the lateral electric field mode liquid crystal having a narrow cell gap is an important subject in the future, and it is effective to apply the dropping bonding method of the present application to the lateral electric field mode liquid crystal.

Although the preferred embodiment has been described above, the present invention is not limited to this embodiment, and various modifications and additions can be made. For example, in the above-described embodiment, the case where the invention is applied to the liquid crystal display device of the horizontal electric field mode has been described, but it is applied to liquid crystal display devices of other forms, for example, to the liquid crystal display device of the vertical electric field mode or the vertical alignment type liquid crystal display device. Can also be applied.

Although the above-mentioned liquid crystal display devices are all assumed to be transmissive, they are also applicable to a reflective liquid crystal display device in which light incident from the upper substrate is reflected by a reflective electrode formed on the lower substrate for display. Applicable.

Further, when a substrate having low heat resistance such as plastic is used, it is necessary to cure the sealing material only with UV light, so that the application of the present invention is particularly effective.

[0110]

As described above, according to the liquid crystal display device of the present invention, it is possible to provide the liquid crystal display device which can ensure the uniformity of the cell gap of the liquid crystal in the liquid crystal dropping bonding method.

Further, according to the method of manufacturing a liquid crystal display device of the present invention, the resistance value of the common voltage supply wiring and the light shield is kept sufficiently low, and while the light shield performance is sufficiently maintained, the cell gap of the liquid crystal is reduced. Uniformity can be secured and display unevenness can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a liquid crystal display device for explaining the present invention.

FIG. 4 is a sectional view illustrating a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between light leakage and the amount of projection of a light shield for explaining a fourth embodiment of the present invention.

FIG. 6 is a sectional view for explaining a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view illustrating a liquid crystal display device according to a sixth embodiment of the present invention.

8 is a cross-sectional view taken along the line A-A 'of FIG.

FIG. 9 is an enlarged plan view of section c of FIG.

FIG. 10 is an outline view in order of steps for explaining a liquid crystal dropping bonding method.

11 is a cross-sectional view taken along the line BB ′ of FIG. 5, which is a cross-sectional view for explaining the first conventional liquid crystal display device.

FIG. 12 is a cross-sectional view illustrating a second conventional liquid crystal display device.

FIG. 13 is a diagram showing the relationship between the aperture ratio of a transmission hole and the amount of ultraviolet light necessary for curing a sealing material.

FIG. 14 is a diagram showing the relationship between the distance between through holes and the degree of curing of the sealing material.

[Explanation of symbols]

101 Lower Substrate 102 Gate Terminal 103 Gate Lead Wiring 104 Drain Terminal 105 Drain Lead Wiring 106a, 106b, 106c Common Voltage Supply Wiring / Shader 107 Insulating Film 107a Gate Insulating Film 107b Passivation Film 201 Seal Layer 202 Transfer 203 Liquid Crystal Layer 301 Upper Side Substrate 302 Opposite-side light shield 303 Opposite electrode 401 Display section 402 Peripheral section 403 Overcoat layer 304 Organic film 501 UV mask 502 Mask patterns 601, 602 Transmission hole

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsutomu Renya             5-7 Shiba 5-1, Minato-ku, Tokyo NEC Corporation             Inside the company (72) Inventor Ken Sasaki             5-7 Shiba 5-1, Minato-ku, Tokyo NEC Corporation             Inside the company F-term (reference) 2H089 NA43 NA44 QA05 QA14 QA16                       SA17 TA02 TA11 TA15                 2H091 FA08X FA08Z FA34Y FD02                       GA02 GA08 GA09 KA10 LA03                       LA18 LA30

Claims (19)

[Claims] 1. A lower substrate having a display unit and a peripheral portion around the display unit, and a liquid crystal layer sandwiched between the lower substrate and a sealing layer formed on the peripheral portion of the lower substrate. A liquid crystal display device having a side substrate and an upper substrate bonded together, wherein a lead wire and a light shield drawn from a display portion formed in the peripheral portion of the lower substrate overlap with the sealing layer. In the seal layer, regions where the seal layer does not overlap the lead wiring and the light shield are regularly arranged, and the distance between the lead wiring and the region not overlap the light shield is 80 μm.
A liquid crystal display device characterized by being m or less. 2. A lower substrate having a display unit and a peripheral portion around the display unit, and a liquid crystal layer sandwiched between the lower substrate and a sealing layer formed on the peripheral portion of the lower substrate. A liquid crystal display device having a side substrate and an upper substrate bonded together, wherein a light shield formed in the peripheral portion of the lower substrate overlaps the seal layer, and the lower substrate is the seal. A plurality of transmission holes are regularly arranged in the region overlapping with the layer, and the distance between the plurality of transmission holes is 8
A liquid crystal display device having a thickness of 0 μm or less. 3. A counter-side light shield formed in the peripheral portion of the upper substrate overlaps the seal layer, and a region of the seal layer where the seal layer and the counter-side light shield do not overlap is formed. The liquid crystal display device according to claim 1, wherein the liquid crystal display devices are arranged regularly. 4. The liquid crystal display device according to claim 1, wherein the sealing layer is completely covered by a light-shielding member on the opposite side formed on the peripheral portion of the upper substrate. 5. The liquid crystal display device according to claim 1, wherein the opposite-side light shield formed on the peripheral portion of the upper substrate does not overlap with the seal layer. 6. The opposite side light shield formed on the peripheral portion of the upper substrate has a cell gap width of the liquid crystal or a width twice the cell gap from the boundary of the seal layer on the display portion side, and the peripheral portion. The liquid crystal display device according to claim 1 or 2, wherein the liquid crystal display device overlaps with the seal layer only in a region extended to the portion. 7. A lower substrate having a display portion and a peripheral portion around the display portion, and a liquid crystal layer sandwiched between the lower substrate and a sealing layer formed on the peripheral portion of the lower substrate. A liquid crystal display device having a side substrate and an upper substrate bonded together, wherein an opposite side light shield formed in the peripheral portion of the upper substrate overlaps with the seal layer, and the seal in the seal layer is provided. A liquid crystal display device, wherein layers are regularly arranged in regions that do not overlap the opposing light shield, and a distance between regions that do not overlap the opposing light shield is 80 μm or less. 8. A lower substrate having a display unit and a peripheral portion around the display unit, and a liquid crystal layer sandwiched between the lower substrate and a sealing layer formed on the peripheral portion of the lower substrate. A liquid crystal display device having a side substrate and an upper substrate bonded to the side substrate, wherein a counter-side light shield formed in the peripheral portion of the upper substrate overlaps with the seal layer, and the upper substrate is the seal. A liquid crystal display device, wherein a plurality of transmission holes are regularly arranged in a region overlapping with the layer, and a distance between the plurality of transmission holes is 80 μm or less. 9. A lower substrate having a display unit and a peripheral portion around the display unit, and a liquid crystal layer sandwiched between the lower substrate and a sealing layer formed in the peripheral portion of the lower substrate. A liquid crystal display device comprising a side substrate and an upper substrate bonded together, wherein a light shield is not provided in a region of the upper substrate which overlaps with the seal layer. 10. A lead-out wiring drawn from a display portion formed in the peripheral portion of the lower substrate and a light shield overlap with the seal layer, and the seal layer in the seal layer is the lead-out. 9. The liquid crystal display device according to claim 7, wherein the wiring and the region which does not overlap with the light shield are regularly arranged. 11. A lower substrate having a display unit and a peripheral portion around the display unit, and a liquid crystal layer sandwiched between the lower substrate and a sealing layer formed on the peripheral portion of the lower substrate. A liquid crystal display device having a side substrate and an upper substrate bonded together, wherein a counter-side light shield formed in the peripheral portion of the upper substrate has a cell gap of the liquid crystal from a boundary of the seal layer on the display unit side. The liquid crystal display device is characterized in that it is overlapped with the sealing layer only in a region extending to the peripheral portion, the width of which is twice the width of the cell gap. 12. The liquid crystal display device according to claim 3, wherein the light shield on the opposite side is an organic film. 13. An organic film is formed on the lower substrate,
The liquid crystal display device according to claim 1, wherein the organic film does not overlap with the seal layer. 14. The liquid crystal display device is a lateral electric field mode liquid crystal display device.
The liquid crystal display device according to any one of 1. 15. A step of forming a seal layer on the peripheral portion of a lower substrate including a display portion and a peripheral portion around the display portion, and dropping a liquid crystal material in a region surrounded by the seal layer of the lower substrate. And a step of bonding the upper substrate and the seal layer,
A method of manufacturing a liquid crystal display device, comprising: irradiating the seal layer with light to cure the seal layer, wherein a lead wire and a light shield formed in the peripheral portion of the lower substrate and drawn from a display unit. Overlap with the seal layer, and regions of the seal layer in which the seal layer does not overlap the lead wiring and the light shield are regularly arranged, and do not overlap the lead wiring and the light shield. A method for manufacturing a liquid crystal display device, wherein the distance between the regions is 80 μm or less. 16. A plurality of transmission holes are regularly arranged in a region where the lead wiring and the light shield overlap with the seal layer, and light for curing the seal layer is irradiated from the lower substrate side. 16. The method for manufacturing a liquid crystal display device according to claim 15, wherein. 17. A step of forming a seal layer on the peripheral portion of a lower substrate having a display portion and a peripheral portion around the display portion, and dropping a liquid crystal material on a region surrounded by the seal layer of the lower substrate. And a step of bonding the upper substrate and the seal layer,
A method of manufacturing a liquid crystal display device, comprising: irradiating the seal layer with light to cure the seal layer, wherein an opposite-side light shield formed in the peripheral portion of the upper substrate overlaps with the seal layer. Areas where the seal layer does not overlap with the opposite-side light shield are regularly arranged, and a distance between the lead wiring and the area not overlap with the light shield is 80 μm or less. Liquid crystal display device manufacturing method. 18. A plurality of transmission holes are regularly arranged in a region where the opposite-side light shield overlaps the seal layer, and light for curing the seal layer is irradiated from the upper substrate side. The method for manufacturing a liquid crystal display device according to claim 17. 19. A step of forming a seal layer on the peripheral portion of a lower substrate including a display portion and a peripheral portion around the display portion, and dropping a liquid crystal material in a region surrounded by the seal layer of the lower substrate. And a step of bonding the upper substrate and the seal layer,
A method of manufacturing a liquid crystal display device, comprising the step of irradiating the seal layer with light to cure the seal layer, wherein an opposing light shield formed in the peripheral portion of the upper substrate overlaps with the seal layer. The method for manufacturing a liquid crystal display device is characterized by irradiating light for curing the sealing layer from the upper substrate side.