JPH10232402A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a seal pattern into a structure to facilitate degassing from the liquid crystal panel and to prevent the seal pattern from being damaged by forming a 1st opening and at least another opening to peripheral seals. SOLUTION: Another opening part 21D is formed to peripheral seal 21B of a liquid crystal panel in addition to a liquid crystal filling port 21C. The opening parts 21C, 21D are opened at a hot press stage, and in the hot press process form moving from a state B to a state C, the air in the panel is degassed not only through the opening part 21C but also through 21D. As a result, a stress applied onto the partially hardened peripheral seal 21B decreases and a problem such as damage of the peripheral seal 21B, etc., is avoided. Moreover, since the stress applied onto the seal 21 decreases, it becomes unnecessary to conduct a heat treatment in a pre-curing process for partially hardening the seal as strict as before, and a yield of manufacturing liquid crystal device is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a liquid crystal display device, and more particularly, to a method of manufacturing a liquid crystal display device with an improved yield and a liquid crystal display device manufactured by such a method.
Liquid crystal display devices have low power consumption and are widely used as display devices of portable information processing devices. On the other hand, recently, an attempt has been made to use a liquid crystal display device as a so-called desktop type display device which replaces a conventional CRT. It is generally desired that such a liquid crystal display device for desktop use has a large display area.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a liquid crystal display device, a glass substrate having a seal pattern formed thereon is bonded to an opposing glass substrate in a vacuum and heated to melt the seal pattern. By pressing a pair of glass plates against the melted seal pattern, a liquid crystal panel having a predetermined thickness has been manufactured. However, in this method, since the heating is performed in an electric furnace, the temperature is slowly increased, and it is difficult to reduce the tact time when mass-producing the liquid crystal panel.

On the other hand, in recent years, a method of forming a liquid crystal panel by pressing opposing glass substrates by hot pressing has begun to be used. In this method, by incorporating heaters into the upper and lower platens that hold the glass substrate, it is possible to directly heat the seal pattern on the substrate in a short time, shortening the tact time and improving the manufacturing throughput It becomes possible to do.

FIG. 10 shows a process of manufacturing a liquid crystal panel using a conventional hot press apparatus. Referring to FIG.
The hot press device includes a lower platen 11 for holding a glass substrate laminate 10 composed of a pair of glass substrates stacked with a seal therebetween via a buffer layer 12, and a buffer on the glass substrate laminate 10 from above. The upper placenta 14 engages via the layer 13, and the upper and lower platens 11, 14 incorporate heaters 11 A, 14 A, respectively.

Accordingly, the upper platen 14 is pressed against the lower platen 11 as shown by an arrow in FIG.
14A, the glass substrate laminate 1 is driven.
The glass substrates constituting the glass substrate 0 are joined to each other via a seal pattern interposed therebetween, thereby obtaining a liquid crystal panel. As described above, the glass substrate is used for the heaters 11A and 14A.
Since the seal pattern is directly heated by A, the melting of the seal pattern occurs in a short time, and as a result, the tact time for panel manufacturing can be greatly reduced.

[0006]

On the other hand, as described above, the liquid crystal display device is now used not only for a small portable information processing device but also for a desktop application replacing a conventional CRT. And For this purpose, it is necessary to increase the area of each liquid crystal panel. However, when an attempt is made to produce a liquid crystal panel having such a large area by a hot press method, due to degassing that occurs during hot pressing. It has been discovered that a problem of breaking the seal pattern occurs.

FIGS. 11A to 11C illustrate problems that occur when such a conventional hot pressing method is applied to the manufacture of a large-area liquid crystal panel. Referring to FIG. 11A, a color filter (not shown) is provided on panel area 21A.
Is held on the lower platen 11 of the hot press apparatus of FIG. 10 so that the color filter is on the upper side.
2, a thin film transistor (TF) is formed in the panel region 22A.
T) Another glass substrate 22 carrying the array is held with the TFT array down. A seal pattern 21B, typically made of epoxy resin, is formed on the upper side of the glass substrate 21 so as to surround the panel region 21A. As shown in FIG. When 21 and 22 are overlapped, the seal pattern 21B is interposed between the substrates 21 and 22 and separates them from each other. As shown in FIG. 11B, a spacer 23 made of silica spheres or polymer spheres is provided between the substrates 21 and 22.

In the state shown in FIG. 11B, the seal pattern 21B has a width of, for example, 0.3 mm and a height of, for example, 15 μm.
When the substrate 22 is pressed against the substrate 21 by a hot press device as shown in FIG. 11C, the height is reduced to, for example, about 5.8 μm in 5 to 10 seconds. For this reason, in the hot pressing step of FIG. 11C, it is necessary to efficiently degas the air between the substrates 21 and 22 in a short time.

As can be seen from the seal pattern 21B of FIG. 11A, the seal pattern has a liquid crystal injection hole 21C for introducing liquid crystal into a completed liquid crystal panel. Although it is possible through a hole, the hot pressing in the step of FIG. 11C is performed at a high speed as described above, so that the substrate size is large.
Therefore, when the area of the regions 21A and 22A is large, FIG.
As shown in (C), the problem that the melted seal pattern 21B is broken by the pressure at the time of degassing or the liquid crystal injection hole is broken easily occurs.

The problem of breakage of the seal pattern 21B has been dealt with by performing a pre-curing step of pre-curing the seal pattern at an appropriate temperature prior to hot pressing. Needs to be controlled very strictly (temperature difference is typically within ± 0.2 ° C.), which causes a decrease in the yield of the liquid crystal display device. If the temperature of the pre-curing step is increased, the curing of the seal pattern proceeds, so that even if such a hot press is performed, the problem that the melted seal pattern is damaged by air pressure can be avoided. Is cured and the thickness of the liquid crystal cell does not reach the predetermined thickness. Such a liquid crystal cell has a thickness exceeding a predetermined value and is a defective product.

Accordingly, it is a general object of the present invention to provide a method of manufacturing a liquid crystal display device which solves the above-mentioned problems, and a liquid crystal display device manufactured by such a manufacturing method. A more specific object of the present invention is to provide a structure in which a pair of substrates are bonded to each other via a seal pattern by a hot press method to form a liquid crystal panel, and the seal pattern is formed to promote degassing from the liquid crystal panel. An object of the present invention is to provide a method for manufacturing a formed liquid crystal display device, and a liquid crystal display device manufactured by such a manufacturing method.

Another object of the present invention is to form a liquid crystal panel by bonding a pair of substrates with a seal pattern therebetween by a hot press method, and to apply the seal pattern to a pre-curing temperature in a pre-curing step of the seal pattern. It is an object of the present invention to provide a method of manufacturing a liquid crystal display device, which does not require strict management.

[0013]

According to the present invention, there is provided a method for forming a peripheral seal on a first substrate, comprising the steps of: forming a peripheral seal on a first substrate; Disposing a second substrate on the side where the seal is formed, such that the peripheral seal is interposed between the first substrate and the second substrate; and the first and second substrates. And forming a first opening and at least one other opening in the peripheral seal. A method for manufacturing a liquid crystal display device, comprising the steps of: Or as described in claim 2, further comprising a step of injecting a liquid crystal from the first opening into a gap between the first substrate and the second substrate. The method for manufacturing a liquid crystal display device according to claim 1 or the method according to claim 3. As described above, the first opening is formed on a first side of the peripheral seal, and the another opening is formed on another side of the peripheral seal. 4. The method according to claim 1, wherein a plurality of the different openings are formed by the method of manufacturing a liquid crystal display device according to claim 2, or as described in claim 4. The method of manufacturing a liquid crystal display device according to claim 5, or as described in claim 5, before the joining step, the peripheral seal is set to a temperature within 1.5 ° C. accuracy with respect to a predetermined optimum temperature. The method according to any one of claims 1 to 4, further comprising a step of pre-curing the liquid crystal display device, or as described in claim 6, wherein the another opening is Characterized in that after the joining step, it is sealed with resin. The method of manufacturing a liquid crystal display device according to any one of claims 1 to 5, or as described in claim 7, the another opening is formed by deformation of a peripheral seal accompanying the bonding step. The liquid crystal display device according to any one of claims 1 to 5, wherein the liquid crystal display device is formed so as to be closed spontaneously, or as described in claim 8, 8. The liquid crystal display device according to claim 7, wherein the another opening includes a pattern having substantially the same composition as that of the peripheral seal formed in a range where the peripheral seal is deformed in the joining step. According to the manufacturing method of the first aspect, or as described in the ninth aspect, the peripheral seal is provided with the first seal.
9. A method according to any one of claims 1 to 8, wherein a plurality of each are formed so as to surround one region on the substrate. As described in 10, the plurality of peripheral seals are formed on the first substrate so as to surround one region, and the another opening is provided on each of the plurality of peripheral seals. 9. The method as claimed in claim 1, wherein
A first substrate and a second substrate disposed so as to face the first substrate by the method of manufacturing a liquid crystal display device according to any one of the first to third aspects. A substrate; first electrode means disposed on a side of the first substrate facing the second substrate; and a first electrode means disposed on a side of the second substrate facing the first substrate. The second electrode means, and a first electrode covering the first electrode means on the first substrate.
A second molecular alignment film covering the second electrode means on the second substrate; and a first molecular alignment film interposed between the first and second substrates; In a liquid crystal display device including a peripheral seal defining a closed space between the substrates and a liquid crystal layer filling the closed space, the peripheral seal includes:
At least two openings are formed, and the at least two openings are sealed with a resin. The liquid crystal display device, or as described in claim 12, wherein the openings are: A cutout formed in the peripheral seal, and an isolated pattern formed adjacent to the cutout and made of a material having substantially the same composition as the peripheral seal, wherein the pattern is formed of the peripheral seal. The liquid crystal display device according to claim 11 or 13, wherein the peripheral seal and the pattern are formed so as to overlap each other when a deformation accompanying the bonding process occurs. As described, the opening has a notch formed in the peripheral seal, and one or a plurality of materials formed in the notch and having substantially the same composition as the peripheral seal. A standing pattern, wherein the isolated pattern is formed at a distance such that the peripheral seal and the pattern overlap with each other when the peripheral seal is deformed during a joining process. Item 11
The problem is solved by the liquid crystal display device described above.

Hereinafter, the principle of the present invention will be described with reference to FIG. However, in FIG. 1, the parts described above are denoted by the same reference numerals, and description thereof will be omitted. Referring to FIG. 1A, in the present invention, a peripheral seal 21B of a liquid crystal panel is provided.
Then, another opening 21D is formed in addition to the liquid crystal injection hole 21C. The openings 21C and 21D are opened at the stage of hot pressing, and as a result, the state shown in FIG.
In the hot pressing step for shifting to the state of (C), the air in the panel escapes not only through the opening 21C but also through the opening 21D. As a result, the partially cured peripheral seal 21B
Is reduced, and problems such as breakage of the peripheral seal 21B are avoided. In addition, since the stress applied to the seal 21 is reduced, it is not necessary to strictly perform the heat treatment in the pre-curing step of partially curing the seal as in the related art, thereby improving the production yield of the liquid crystal display device.

[0015]

FIG. 2 shows a structure of a peripheral seal formed on a glass substrate 31 constituting a liquid crystal panel 30 according to a first embodiment of the present invention. Referring to FIG. 2, the glass substrate 31 has dimensions of 400 × 500 × 0.7 mm as a whole, and defines liquid crystal panel areas AA, BA, AB and BB each having dimensions of 200 × 250 × 0.7 mm. Have been.

On a substrate 31 shown in the drawing, areas AA, BA,
A seal pattern 32 made of an epoxy resin is formed by a dispenser so as to surround each of AB and BB. Each of seal patterns 32 defining regions AA and BA has a separate liquid crystal injection hole 32A in addition to the normal liquid crystal injection hole 32A. Opening 3
2B is formed on a side different from the side on which the liquid crystal injection hole 32A is formed. In the illustrated example, in each of the liquid crystal panel regions, an extraction portion is formed on the left side and the upper side, and thus no opening is formed. In the example of FIG. 2, the seal pattern 32 defining the panel regions AB and BB is used.
Is not formed with the another opening 32B.

The seal pattern 32 is typically made of an epoxy resin, and has a width of about 0.3 mm and a height of about 15 μm in an uncured state. On the other hand, the opening 32A is typically formed to a length of 8 mm, and the opening 32B is
It is formed to a length of about 10 mm. As will be described in a later embodiment, when the length of the opening 32 is long, the seal stability may be left in the opening to improve the mechanical stability.

On the substrate 31 of FIG. 2, areas AA, BA,
A TFT array and cooperating electrodes are formed corresponding to AB and BB, respectively, and a molecular alignment film is formed to cover them. The substrate 31 is further overlaid on a corresponding glass substrate 33 carrying the color filters shown in FIG. However, when the glass substrate 33 in FIG. 3 is overlaid on the glass substrate 31 in FIG.

The glass substrates 31 and 33 are previously described with reference to FIG.
Are joined by the hot press process described in the above. In the hot pressing step, first, the substrate 31 is heated to a predetermined preheating temperature,
For example, the seal 32 is pre-cured by heating to 95.3 ° C. For this purpose, a known compound or structure that decomposes at a predetermined pre-curing temperature and releases the catalyst is formed in the seal 32. Further, the substrate 31 on which the seal 32 has been pre-cured as described above is mounted on the hot press apparatus shown in FIG. 10, and the substrate 33 is superposed on the substrate 31 while being turned left and right. Furthermore, the upper and lower platens 1 of the hot press machine
The heaters 11A and 14A are heated to 140 ° C. by driving the heaters 11A and 14A, and at the same time, the upper platen 14 is pressed against the lower platen 11 with a force of 1.8 tons. Hold. Thereafter, the temperature is further increased to 160 ° C., and the heating is continued for another 2 minutes, whereby the curing of the seal 32 is completed.

After the seal 32 is thus cured, the substrates 31, 33 are cut and formed into respective liquid crystal panels AA, BA, AB, BB along the scribe lines X, Y shown in FIG. After each of the liquid crystal panels further seals the opening 32B with a resin such as a UV curable resin, liquid crystal is injected from the opening 32A. After the liquid crystal is injected, the opening 32A is sealed, and a polarizer and an analyzer are formed on the outer surfaces of the substrates 31 and 33, respectively.

FIG. 4 is a flowchart summarizing the above steps. Referring to FIG. 4, at step S1, a seal pattern 32 is formed on the substrate 31, and at step S2, the seal pattern 32 is pre-cured at a predetermined optimum temperature, typically 95.3 ° C. In step S1, the seal pattern 32 is formed on the substrate 31 carrying a TFT array or the like, but may be formed on the opposite substrate 33 carrying a color filter.

Next, in the step S3, the substrates 31, 3
3 are stacked on each other and hot-pressed in the hot press apparatus shown in FIG. The hot pressing is preferably performed by a single-wafer hot pressing method in which a pair of substrates 31 and 33 is hot-pressed one by one so that the temperature can be rapidly increased. 32 is completely cured. Further, the hot pressing step of step S3 can be performed in a vacuum as needed. Also in this case, by forming a plurality of openings in the seal pattern 32, damage to the uncured seal pattern 32 during exhaust can be reduced.

After the hot pressing, the substrates 31 and 33 are cut along the scribe lines X and Y in step S4, and the exhaust ports 32B of the respective liquid crystal panels are sealed with resin in step S5. Further, in step S6, the liquid crystal passes through the opening 32A and
After being injected into the space between the first and third substrates and sealing the opening 32A with a resin in step S7, a polarizer and an analyzer are formed on the outer surfaces of the substrates 31 and 33, respectively, in step S8.

FIG. 5 shows a part of the liquid crystal display device thus formed. As can be seen from FIG.
A TFT or an electrode pattern 31A is formed thereon,
A molecular alignment film 31B is formed to cover this.
On the other hand, the substrate 33 carries three primary color filters 33A of RGB, and a light shielding film 33B is formed between the adjacent filters 33A. Further, the filter 33A and the light shielding film 33B
And another molecular alignment film 33C is formed. A space is formed between the molecular alignment films 31B and 33C by a spacer 34A such as a silica ball.
As described above, the liquid crystal layer 34 is formed by the vacuum injection method or the like. The peripheral seal 32 is formed around the substrates 31 and 33.
Reference numeral 2 includes a fiber spacer 32a, and does not completely flow even in a molten state.

Although not shown, a polarizer and an analyzer are formed on the lower main surface of the substrate 31 and the upper main surface of the substrate 33, for example, in a crossed Nicol state. In the present invention, during hot pressing, deaeration is performed not only in the opening 32A used for injecting the liquid crystal but also in the opening 32B.
Is substantially reduced. For this reason, in the past, very strict temperature control was required when the seal pattern 32 was partially cured, but in the present invention, the accuracy of such temperature control is substantially relaxed.

Table 1 below shows the relationship between the quality of the seal and the preheating temperature for the liquid crystal panel formed using the substrate 31 having the structure shown in FIG.
Are shown in comparison with the conventional case where no is formed. In the configuration of FIG. 2, the opening 32B is provided only in the liquid crystal panel areas AA and BA.
Are formed, but are not formed in the liquid crystal panel regions AB and BB. On the other hand, in Table 1, "conventional" is indicated by
The opening 32B is not formed in any of the regions. In the example of Table 1, the opening 32A has a length of 8 mm as described above, while the opening 32B has a length of 10 mm. Further, the opening 32B has a diameter of 1 at its center.
The dot area of mm is formed at the same height by the same material as the seal 32.

[0027]

[Table 1]

As can be seen from Table 1, in the related art, even if the preheating temperature is lowered by 1.2 ° C. from the optimum value, the seal deteriorates.
Within ± ° C, considering errors in the vertical direction, preferably ±
Although it was necessary to control the temperature within 0.2 ° C., according to the present invention, it is understood that even if the preheating temperature is lowered by 1.5 ° C. from the optimum temperature, the deterioration of the seal does not occur. In consideration of the temperature error in the vertical direction, in the present invention, the preliminary heating temperature may be performed with an accuracy within ± 1.0 ° C.

Table 2 below shows that the optimum preheating temperature is 95.
Using a seal at 5 ° C., the length of the opening 32B is 5 m
m and the pre-heating (pre-cure)
This shows the relationship with temperature.

[0030]

[Table 2]

In Table 2, the word "conventional" indicates the panel regions AA to AA on the substrate 31 of FIG.
BB is not formed in any of the openings 32B.
It can be seen that a slight deterioration of the seal by only 0.4 ° from 5 ° C results in poor sealing. On the other hand, when the opening 32B having a length of 5 mm is formed in the seal pattern 32 that defines the liquid crystal panel regions AA and BA, even if the preheating temperature is lowered by -1.6 ° from the optimum temperature, the sealing is performed. It turns out that no problem occurs. Further, similar results can be obtained when the openings 32B are formed in the liquid crystal panel regions AB and BB. That is, the preheating temperature is set at 1.2 degrees from the optimum temperature.
Even if the temperature decreases, no problem occurs in the seal.

Table 3 below shows that in step S5 of FIG.
It shows the speed at which the resin enters the opening 32B when the opening 32B is sealed with UV resin.

[0033]

[Table 3]

However, in Table 3, the opening 32B is 1
This is a case where a point made of the same material as the seal pattern 32 having a length of 0 mm and a diameter of 1 mm in the center is formed at the same height. Referring to Table 3, the resin reached a position of 0.5 to 1.1 mm from the edge of the panel 2 minutes after application and 0.8 to 5 mm from the center of the seal after 5 minutes.
It reaches the position of 1.5 mm. Further, after 10 minutes, the resin reaches the inner edge of the seal pattern 32, which is 1.5 to 1.8 mm from the panel edge, and is formed at a position 1.8 to 1.9 mm from the panel edge after 15 minutes. To the light-blocking mask.

The results in Table 3 show that in step S5 in FIG. 4, the opening 32B is sealed within 15 minutes, preferably 10 minutes.
It turns out that it needs to be completed within minutes. The permeation of the resin is stopped by, for example, irradiating ultraviolet rays to solidify the resin. Table 4 shows the results of examining the quality of the obtained liquid crystal panel from both aspects of the panel thickness and the seal leak for the openings 32B having various shapes. The length of the opening 32B is 10 mm and 5 mm, and the length is 1 mm.
In the case of 0 mm, a point having a diameter of 1 mm in the opening is
One or two, with the same material and composition as the seal pattern 32,
Also, they are formed at the same height.

[0036]

[Table 4]

As can be seen from Table 4, no seal leak occurred in any case, and it was found that the seal pattern of the obtained structure was not damaged. On the other hand, regarding the defect of the cell thickness, the one having two dots formed in the opening 32B of 10 mm had the highest value, and the defect rate reached 8.3%. On the other hand, when the length of the opening 32B was 10 mm and only one dot was formed, the defect rate was reduced to 2.5%, but the allowable limit reached 21.8%. In contrast, no defect occurred when the length of the opening 32B was 5 mm. From this, it is understood that it is preferable that the opening 32B is formed to have a length of 5 mm and no isolated pattern such as a dot is formed therebetween.

FIG. 6 shows a substrate 3 according to a second embodiment of the present invention.
1 'is shown. However, the same reference numerals are given to the parts described above, and the description will be omitted. Referring to FIG. 6, in the substrate 31 ', the openings 32B are formed not only in the seal patterns 32 defining the liquid crystal panel regions AA and BA, but also in the seal patterns 32 defining AB and BB. . As a result, even when hot pressing is performed by the hot pressing apparatus of FIG. 10, degassing of the entire glass substrate proceeds more quickly, and the tact time for manufacturing a liquid crystal display device can be further reduced.

FIGS. 7A and 7B show the structure of an opening 32B according to a third embodiment of the present invention. However,
Corresponding reference numerals are given to portions described above, and description thereof will be omitted. Referring to FIG. 7A, a continuous pattern 32b of the same material and the same height as the seal pattern 32 is formed outside the liquid crystal panel region, for example, the region AA, corresponding to the opening 32B. It is formed in parallel with the seal pattern 32, but from the pattern 32 so as to be included in an area that expands when the pattern 32 is deformed in the hot pressing process.

According to this configuration, when hot pressing is performed in step S3 of FIG.
Is fused with the molten pattern 32b in the opening 32B to form a seal for automatically sealing the opening 32B. In this case, before the seal pattern 32 and the pattern 32b are deformed to form a seal,
Degassing in the liquid crystal panel has been completed, and degassing is not hindered.

FIG. 7B shows a modification of FIG. 7A.
Referring to FIG. 7B, in this structure, the opening 32
In B, a dot-shaped pattern 32b 'made of the same material and composition as the seal pattern 32 and having the same height is formed.
When hot pressing is performed in step S3 of FIG. 4, the pattern 32b ′ is deformed simultaneously with the seal pattern 32 to form a seal for sealing the opening 32B.

In the structure of FIG. 7A or 7B,
The step of resin-sealing the exhaust port 32B in step S5 of FIG. 4 can be omitted, and the opening 32B described in Table 3 can be omitted.
The problem of the intrusion of the resin into the resin can be avoided. FIG.
(A) and (B) show the appearance and a part of a liquid crystal display device to which the present invention is applied.

As can be seen from FIG. 8A, each liquid crystal display device is formed by laminating the substrates 31 and 33, and further has, on one side thereof, a resin block 32X for closing the opening 32B. I do. FIG. 8B shows the resin block 32X in detail. As can be seen from FIG. 8B, the resin block 32X fills the opening 32B formed in the seal pattern 32.

Although the hot pressing step S3 in FIG. 4 is to be performed in the air in the above description, it can be performed in a vacuum as described above.
In this case, the seal pattern is not originally damaged by the hot press process itself, but the uncured seal pattern is prevented from being deformed even if the vacuum deaeration process prior to the hot press is performed rapidly, and the production throughput of the liquid crystal display device is reduced. Is improved.

In each of the above embodiments,
The opening 32B provided for degassing can be used for liquid crystal injection. Further, the liquid crystal is
A and 32B can be simultaneously injected from two places. As described above, the opening 32B is advantageously formed on the side of the liquid crystal panel where the electrode lead is not provided, but the number of the opening 32B is not limited to one per side. Instead, it is also possible to form a plurality as shown in FIG. However, in FIG. 9, the parts described above are denoted by the same reference numerals, and description thereof will be omitted.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to such embodiments, and various modifications and changes can be made within the scope of the appended claims. .

[0047]

According to the feature of the present invention, a step of forming a peripheral seal on a first substrate, and a step of forming a peripheral seal on the first substrate, Second
Disposing the substrate so that the peripheral seal is interposed between the first substrate and the second substrate, and pressing and bonding the first and second substrates while heating the first and second substrates Forming a first opening and at least one other opening in the peripheral seal so that the first and second openings are formed during the bonding step. The air between the substrates can be quickly evacuated without damaging the uncured peripheral seal, so that the tact time for manufacturing the liquid crystal display device can be reduced and the yield can be improved. The effect of the present invention is particularly remarkable when a large-area liquid crystal display device is manufactured.

According to the second aspect of the present invention, further, by injecting liquid crystal from the first opening into a gap between the first substrate and the second substrate, The opening used for degassing can also be used for liquid crystal injection. According to a feature of the invention as set forth in claim 3, the first opening is formed on a first side of the peripheral seal and the another opening is formed on another side of the peripheral seal. This prevents degassing during hot pressing from being concentrated on a specific side, thereby enabling stable degassing.

According to the fourth aspect of the present invention, by forming a plurality of the other openings on one side, it is possible to improve the efficiency of deaeration. According to the feature of the present invention described in claim 5, prior to the joining step,
The peripheral seal is set at ± 1.0 ° with respect to a predetermined optimum temperature.
By pre-curing at a temperature within the accuracy of C, the pre-curing of the seal does not require very strict temperature control, which has been required conventionally, thereby increasing the manufacturing throughput of the liquid crystal display device and improving the yield.

According to a feature of the present invention, the another opening is sealed with a resin after the joining step, so that the liquid crystal is normally filled through the first opening. Infusion is enabled using conventional conventional equipment. Claim 7,
According to the feature of the present invention described in 8, the another opening is formed so as to be spontaneously closed by deformation of a peripheral seal accompanying the joining step, so that the step of sealing the opening is omitted. it can.

According to the ninth aspect of the present invention, a plurality of the peripheral seals are formed on the first substrate so as to surround one area, whereby a large number of liquid crystal panels can be formed. In addition, it is possible to manufacture the semiconductor device efficiently and at a high yield in a single bonding step. According to a feature of the present invention as set forth in claim 10, a plurality of said peripheral seals are formed on said first substrate, each surrounding one area, and said another opening is formed in said plurality of peripheral seals. By forming each of the seals, the degassing efficiency when a large number of liquid crystal panels are joined together can be maximized.

According to the features of the present invention described in claim 11,
A first substrate, a second substrate disposed to face the first substrate, and a first substrate disposed on a side of the first substrate facing the second substrate. An electrode means, a second electrode means disposed on a side of the second substrate facing the first substrate, and a first electrode covering the first electrode means on the first substrate. A molecular alignment film, and the second substrate on the second substrate.
A second molecular alignment film covering the first electrode means, and the first and second molecular orientation films.
A peripheral seal interposed between the first and second substrates and defining a closed space between the first and second substrates; and a liquid crystal layer filling the closed space. By forming openings at two locations and sealing the at least two openings with a resin, a large-sized liquid crystal panel constituting a liquid crystal display device can be manufactured efficiently and at a high yield by a hot press method. It becomes possible to do.

According to the present invention described in claims 12 and 13,
The opening is formed by a notch formed in the peripheral seal, and an isolated pattern formed of a material having substantially the same composition as the peripheral seal formed adjacent to the notch, By forming the isolated pattern with respect to the peripheral seal so that the peripheral seal and the pattern overlap with each other when a deformation due to a joining process occurs, the opening is sealed at the same time as the joining. And the step of separately sealing the opening with a resin becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram illustrating a configuration of a liquid crystal panel substrate according to a first embodiment of the present invention.

FIG. 3 is a view showing a facing liquid crystal panel substrate used as a pair with the substrate of FIG. 2;

FIG. 4 is a flowchart illustrating a manufacturing process of the liquid crystal panel according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing a part of the liquid crystal display according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating a configuration of a liquid crystal panel substrate according to a second embodiment of the present invention.

FIG. 7 is a view showing a configuration of an opening according to a third embodiment of the present invention.

FIG. 8 is a diagram illustrating an appearance of a liquid crystal display device to which the present invention is applied.

FIG. 9 is a diagram showing a modification of the present invention.

FIG. 10 is a view showing a conventional hot press process.

FIG. 11 is a diagram illustrating a problem associated with a conventional hot press process.

[Explanation of symbols]

 Reference Signs List 10 glass substrate laminate 11 lower surface plate 11A, 14A heater 12, 13 buffer layer 14 upper surface plate 21, 22, 31, 33 substrate 21, AA, BA, AB, BB liquid crystal panel area 21B, 32 peripheral seal 21C, 32A Liquid crystal injection hole 21D, 32B Opening 23, 34A Spacer 31A Electrode 31B, 33C Molecular alignment film 32a Fiber spacer 33A Color filter 33B Light shielding film 34 Liquid crystal layer

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tadashi Hasegawa 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Kenji Okamoto 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Inside Fujitsu Limited

Claims (13)

[Claims] Forming a peripheral seal on a first substrate; and forming a peripheral seal on a side of the first substrate on which the peripheral seal is formed.
The second substrate is formed by the peripheral seal and the second substrate.
A method for manufacturing a liquid crystal display device, comprising the steps of: disposing so as to be interposed between the first and second substrates; and pressing and joining while heating the first and second substrates. A method for manufacturing a liquid crystal display device, comprising forming a first opening and at least one other opening. 2. The liquid crystal according to claim 1, further comprising a step of injecting a liquid crystal from the first opening into a gap between the first substrate and the second substrate. A method for manufacturing a display device. 3. The method of claim 2, wherein the first opening is formed on a first side of the peripheral seal, and the another opening is formed on another side of the peripheral seal. 3. The method for manufacturing a liquid crystal display device according to 1 or 2. 4. The method according to claim 1, wherein a plurality of the other openings are formed. 5. The method according to claim 1, further comprising, before the joining step, a step of pre-curing the peripheral seal at a temperature within ± 1.0 ° C. with respect to a predetermined optimum temperature. 5. The method for manufacturing a liquid crystal display device according to any one of Items 4 to 4. 6. The another opening, after the joining step,
The method for manufacturing a liquid crystal display device according to claim 1, wherein the liquid crystal display device is sealed with a resin. 7. The method according to claim 1, wherein the another opening is formed so as to be spontaneously closed by deformation of a peripheral seal accompanying the joining step. A method for manufacturing the liquid crystal display device according to claim 1. 8. The method according to claim 7, wherein the another opening includes a pattern having substantially the same composition as that of the peripheral seal formed in a range where the peripheral seal deforms in the joining step. The manufacturing method of the liquid crystal display device according to the above. 9. The device according to claim 1, wherein a plurality of the peripheral seals are formed on the first substrate so that each of the peripheral seals surrounds one region. The manufacturing method of the liquid crystal display device according to the above. 10. A plurality of the peripheral seals are formed on the first substrate so as to surround one area, and the another opening is formed in each of the plurality of peripheral seals. Claims 1 to 8, characterized in that
A method for manufacturing a liquid crystal display device according to any one of the preceding claims. 11. A first substrate, a second substrate disposed to face the first substrate, and a first substrate disposed on a side of the first substrate facing the second substrate. First electrode means, a second electrode means disposed on a side of the second substrate facing the first substrate, and a first electrode means on the first substrate. A first molecular alignment film that covers
A second molecular alignment film covering the second electrode means on the first substrate and a closed space interposed between the first and second substrates, interposed between the first and second substrates; In a liquid crystal display device comprising a peripheral seal to be formed and a liquid crystal layer filling the closed space, at least two openings are formed in the peripheral seal, and the at least two openings are sealed with resin. A liquid crystal display device comprising: 12. The opening is provided with a notch formed in the peripheral seal, and an isolated pattern formed adjacent to the notch and made of a material having substantially the same composition as the peripheral seal. 12. The pattern according to claim 11, wherein the pattern is formed such that the pattern overlaps the peripheral seal and the pattern when a deformation accompanying a bonding process occurs. Liquid crystal display. 13. The notch formed in the peripheral seal and one or a plurality of isolated patterns formed of a material having substantially the same composition as the peripheral seal formed in the notch. 12. The method according to claim 11, wherein the isolated pattern is formed at such a distance that the peripheral seal and the pattern overlap with each other when the peripheral seal is deformed during a joining process. The liquid crystal display device according to the above.