JP3281362B2 - Liquid crystal display panel manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display panel, and more particularly, to a method for manufacturing a liquid crystal display panel including a step of forming a liquid crystal sealing material between two substrates. 2. Description of the Related Art A liquid crystal display panel used for various OA devices has a structure in which a liquid crystal is sandwiched between two glass substrates and a polarizing plate is arranged outside the glass substrates.

[0002] Of the two substrates, on the opposing surface sandwiching the liquid crystal,
A thin film transistor (TFT) element, a bus line, a transparent electrode, and the like are formed, and an alignment film for arranging liquid crystal molecules in a certain direction is further formed thereon. In order to realize a uniform gap over the entire surface of the liquid crystal panel, a spherical spacer having a diameter of 5 to 6 μm is interposed between the two substrates. Sealed with adhesive. Actual one
In a panel of about 0 inch, it is important to realize a uniform and fine gap over the entire surface of the panel and fill the gap with liquid crystal. This process is called panelization.

[0003]

2. Description of the Related Art FIG. 13 shows a general process of forming a panel at present. First, as shown in FIG. 13A, a spacer 103 is scattered on one of the two substrates 101 and 102 that have been subjected to the alignment treatment, and the other substrate 102 is dispersed.
Then, a seal 104 made of an adhesive surrounding the display area is formed. An inlet for injecting liquid crystal at one end of the seal 104
105 is provided.

Next, as shown in FIG. 13B, these substrates 101 and 102 are adhered to each other, and a uniform pressure is applied to the substrates 101 and 102 so that the substrates 101 and 102 are applied.
After the gap between 101 and 102 becomes constant at a predetermined value, the seal 104 is cured. The empty panel 106 produced as described above is put into a vacuum device 109 together with a liquid crystal reservoir 108 containing a liquid crystal 107, as shown in FIG. 13C, and the inside of the vacuum device 109 is evacuated to a vacuum. The inlet 105 is immersed in the liquid crystal.

Then, when nitrogen gas is introduced into the vacuum device 109, the liquid crystal 107 is gradually injected between the substrates 101 and 102 due to the pressure difference between the inside and outside of the panel 106 as shown in FIG. When the liquid crystal 107 is injected into every corner of the panel 106, the injection port 105 is sealed with an adhesive 110. This method (hereinafter referred to as a vacuum suction method) has the following problems.

The time required for the process is long, and in particular, several hours are required for liquid crystal injection. It is necessary to put several tens of times the required amount of liquid crystal in the liquid crystal reservoir, and the loss of liquid crystal is large. A new paneling process has been proposed to solve these problems. Next, the process will be described with reference to FIG.

First, as shown in FIG. 14A, a spacer 103 is sprayed on a first substrate 101 of two substrates 101 and 102 that have been subjected to an alignment treatment. Also, the second substrate 102 includes
After forming a seal 104 made of an adhesive surrounding the display area, a liquid crystal 107 is dropped on the area. Next, the substrates 101 and 102 are bonded together to form a panel 106. Then, as shown in FIG. 14 (b), a uniform pressure is applied to the entire surface of the panel 106, and the liquid crystal 107 is filled in the inside of the seal 104. When the seal 104 is cured after the gap between the substrates 101 and 102 reaches a predetermined value, a liquid crystal panel as shown in FIG. 14C is completed.

According to this method (hereinafter, referred to as a dropping method), the time required for the process is greatly reduced as compared with the conventional method, and only the necessary liquid crystal is used. Therefore, when viewed comprehensively, it leads to significant cost reduction.

[0009]

By the way, when the seal 104 is formed with an adhesive in the above-mentioned paneling step,
Although emphasis is placed on accurately forming the position of the seal 104 using a dispenser or screen printing,
When the substrates 101 and 102 of the liquid crystal panel 106 are aligned, the shape of the seal 104 is disturbed, or one of the substrates 10
There is a possibility that the transfer shape for drawing out the common electrode formed in FIG.

The present invention has been made in view of such a problem, and provides a method of manufacturing a liquid crystal display panel capable of forming a shape of a seal surrounding a liquid crystal with high precision in a paneling process. With the goal.

[0011]

The above-mentioned object is achieved by, as illustrated in FIG. 9, forming at least one first convex pattern 42 around a display area of the first substrate 30;
Forming at least one second convex pattern 40, 41 which alternately meshes with the first convex pattern 42 around a display area of the second substrate 31; Supplying a sealing material 46 around a region where the second convex patterns 40 and 41 are formed;
A step of dropping a predetermined amount of liquid crystal on one of the display area of the display area or the display area of the second substrate 31, and the first substrate 30 and the second substrate 31 through the sealing material 46 The problem is solved by a method of manufacturing a liquid crystal display panel, which comprises a step of bonding and a step of curing the sealing material 46.

Alternatively, as shown in FIG. 11, a step of forming at least one first convex pattern 48 around a display area of the first substrate 30;
Forming a second convex pattern 49 on the second substrate 31 to be joined to the second substrate 31; and sealing around either the first convex pattern 48 or the second convex pattern 49. Lumber
Step of supplying 50, of the region surrounded by the first convex pattern 48 of the first substrate 30 or the region surrounded by the second convex pattern 49 of the second substrate 31 A step of dropping a predetermined amount of liquid crystal on one side, a step of bonding the first substrate 30 and the second substrate 31 via the sealing material 50, and a step of curing the sealing material 50 The problem is solved by a method for manufacturing a liquid crystal display panel characterized by the following.

Alternatively, as shown in FIG. 12, a step of forming a sealing material 51 made of an adhesive around a display area of either the first substrate 30 or the second substrate 31; A step of forming a liquid crystal resistant film 52 on the 51,
A step of dropping a predetermined amount of liquid crystal on the display area of one of the first substrate 30 or the second substrate 31, and the first substrate 30 through the sealing material 51 and the coating 52; Bonding the second substrate 31;
And a step of curing the coating film 52.

Alternatively, the problem is solved by the method for manufacturing a liquid crystal display panel, wherein a groove is formed in a region of the first substrate or the second substrate where the sealing material is formed. Alternatively, the bonding step is performed in a reduced-pressure atmosphere, which is solved by the method for manufacturing a liquid crystal display panel.

Alternatively, the bonding step includes a step of performing rough bonding in a reduced-pressure atmosphere, and a step of performing re-alignment with higher accuracy than the rough bonding step in the atmosphere. The liquid crystal display panel manufacturing method described above solves the problem. Alternatively, after bonding the first substrate and the second substrate, a portion of the first substrate or the second substrate that is outside the sealing material is cut. It is solved by a panel manufacturing method.

The figures and symbols described above are cited to facilitate understanding of the invention, and do not limit the invention.

[0017]

According to the present invention, between two opposing substrates, a convex pattern that alternately meshes or a convex pattern that opposes and joins each other is formed on the inside of a region where the sealant is applied. Further, liquid crystal is dropped on the substrates before the substrates are bonded to each other. Thereby, the contact between the liquid crystal between the substrates and the sealing material is cut off by the convex pattern, and the contamination of the liquid crystal by the components of the sealing material is prevented. In addition, the liquid crystal does not enter the space between the substrate and the sealing material beyond the sealing material, and the adhesive strength between the sealing material and the substrate does not decrease.

Further, a liquid crystal resistant film is formed on the sealing material formed on the substrate. Therefore, the components of the sealing material do not mix into the liquid crystal.
In addition, since a groove is formed in the portion of the substrate where the seal material is formed, the spread of the seal material when two substrates are bonded to each other is regulated by the groove, and the shape of the seal material is highly accurate. Formed. If a plurality of such grooves are arranged in the inward and outward directions of the display area, bubbles formed by the invasion of air from the outside spread along the grooves, so that bubbles that cross the seal material are less likely to be formed, Seal leaks are prevented.

Further, when bonding substrates, rough bonding is performed in a reduced-pressure atmosphere and then high-precision re-alignment is performed in the air. Therefore, it is necessary to complicate bonding equipment in a reduced-pressure atmosphere. Disappears.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of the First Embodiment of the Present Invention FIG. 1 is a sectional view showing the steps of the first embodiment of the present invention. First, as shown in FIG. 1A, a first substrate 1 and a second substrate 2 constituting an active matrix type liquid crystal display panel are prepared.

Although the first substrate 1 is not particularly shown,
The semiconductor device includes a glass substrate, a plurality of pixel electrodes formed in a matrix on the glass substrate, a plurality of thin film transistors (TFTs) connected to the pixel electrodes, and an alignment film. Although not particularly shown, the second substrate 2 includes a glass substrate, a color filter formed on one surface thereof, a transparent common electrode, and an alignment film. The guide groove 3 is formed.

From this state, as shown in FIG. 1 (a), after a sealing material 4 made of an adhesive is applied onto the guide groove 3 of the second substrate 2 by a dispenser or screen printing, it is accurately formed. The weighed liquid crystal 5 is dropped at the center of the second substrate 2. Next, as shown in FIG. 1B, the TFT forming surface of the first substrate 1 and the common electrode forming surface of the second substrate 2 are bonded via the liquid crystal 5. In this case, a uniform pressure is applied to the entire surface of the first and second substrates 1 and 2 to spread the liquid crystal 5 all over the inside of the sealing material 4 and the gap between the two substrates 1 and 2 To 5μ
m.

At the time of this bonding, the slightly fluid sealing material 4 is guided by the guide groove 3 and spreads. In this case, there is a possibility that a small amount of the sealing material 4 may protrude inside or outside the second substrate 2 beyond the guide groove 3. In this case, as shown in FIGS. 1 (c) and 1 (d), if the second substrate 2 is cut outside the guide groove 3, the external dimensions can be maintained with high precision.

If the guide groove 3 is provided in advance in the seal forming region for the liquid crystal as described above, the seal material 4 does not spread randomly, and the external dimensions of the liquid crystal panel can be maintained with high precision.
The external dimensions are particularly important from the viewpoint of mounting in a small liquid crystal panel, and the present embodiment enables the formation of a seal close to the accuracy obtained by photolithography.

The guide groove 3 is not limited to the second substrate 2 and may be formed on the first substrate 1 or on both substrates 1 and 2. Good (the same applies to the following embodiments). (B) Description of the Second Embodiment of the Present Invention FIG. 2 is a perspective view showing two substrates used in an apparatus according to an embodiment of the present invention, and a TFT and a pixel formed on one substrate of the apparatus. FIG. 3 is a partial cross-sectional view showing a process of assembling the substrate.

First, a first substrate 6 constituting an active matrix type liquid crystal display panel as shown in FIG.
And a second substrate 7 are prepared. The first substrate 6 is shown in FIG.
As shown in (b), a plurality of thin film transistors (TFTs) formed in a matrix on the glass substrate 6A
8 and a pixel electrode 9 connected to the source electrode. A gate bus line 10 is connected to the gate electrode of the TFT 8, a data bus line 11 is connected to the drain electrode of the TFT 8, and the gate bus line 10 and the data bus line 11 are orthogonal to each other via an insulating film (not shown). Extending in the direction of

The second substrate 7 is, as shown in FIG.
It has a glass substrate 7A, a color filter 12 formed on one surface thereof, and a transparent common electrode 13. The color filter 12 is covered with an overcoat layer 14 made of a photosensitive acrylic material. In addition, a guide groove 15 along the peripheral edge of the substrate is formed in a portion of the overcoat layer 14 slightly inside the edge of the glass substrate 7A by exposure and development. The width of the guide groove 15 is, for example, 0.
5 mm.

An alignment film (not shown) is formed on the TFT 8 on the first substrate 6 or on the common electrode 13 on the second substrate 7. From such a state, FIG.
As shown in (1), a sealing material 16 made of a thermosetting epoxy resin is applied into the guide groove 15 of the second substrate 7 using a dispenser.

Here, as the material of the overcoat layer 14, a material having low adhesion to the sealing material 16 is advantageous for cutting off the glass substrate 7A at the time of cutting. However, generally, the adhesion between the resin layer and the glass substrate is extremely high.
Thereafter, the accurately weighed liquid crystal 17 is dropped at the center of the second substrate. Next, as shown in FIG. 3B, the first and second substrates 6 and 7 are adhered to each other, a uniform pressure is applied to the entire surface, and the liquid crystal 17 spreads inside the sealing material 16.
The gap between the first and second substrates 6, 7 is kept constant. Subsequently, the sealing material is fired at a temperature of 140 to 150 ° C.

At the time of the bonding, the fluid seal 16 is guided to the guide groove 15 and its spread is controlled with high precision. By the way, in the initial stage of applying the sealing material 16, the shape of the sealing material 16 is formed so as to protrude from the guide groove 15 or be isolated in the guide groove 15 due to the difference in the supply amount.

When the sealing material 16 protrudes from the guide groove 15, although the sealing function is surely provided, a high-precision sealing dimensional accuracy cannot be expected. Therefore, a diamond cutter or the like is used as shown in FIG. When the second substrate 7 is cut along the line outside the guide groove 15, the shape of the sealing material 16 becomes highly accurate. The second substrate 7 is not a newly added step because cutting is conventionally performed to take out terminals from the first substrate 6.

When the sealing material 16 is isolated in the guide groove 15 after the bonding, the sealing material 16 does not protrude from the guide groove 15, but is partially thinned or the sealing material 16 is interrupted due to displacement. As a result, a seal leak occurs, so that the supply amount of the sealing material 16 is
It is preferable that the inside is completely filled. When the guide groove 15 is formed in the area where the sealing material 16 is formed, the sealing material 16 does not spread randomly, and the external dimensions can be accurately maintained. This external dimension is particularly important in a small liquid crystal panel from the viewpoint of mounting and the like.

Although a thermosetting sealing material is used in the above description, an ultraviolet curing sealing material may be used (the same applies to the following embodiments). (C) Description of Third Embodiment of the Present Invention FIG. 4 is a cross-sectional view showing a third embodiment of the present invention. First, as shown in FIG. 4A, a first substrate 6 and a second substrate 19 constituting an active matrix type liquid crystal display panel are prepared.

The first substrate 6 has a configuration similar to that of the second embodiment. Similarly to the second embodiment, the second substrate 19 includes a glass substrate 19A and a color filter 21 formed on one surface thereof by being covered with an overcoat layer 20.
And a transparent common electrode 22. The color filter 21 is formed using a photosensitive pigment distribution ink material, and a portion slightly inside the edge portion of the glass substrate 19A is exposed to light and developed to form a guide groove along the periphery of the glass substrate 19A. 23 are formed.

The guide groove 23 is provided in the color filter 2.
It is only necessary to change the photomask at the design stage without adding any process by photolithography when forming 1. As a layer of the color filter 21 forming the guide groove 23, for example, a red layer (R
Layer) 21R, but a red layer 21R, a green layer 21
G or two or three layers of the blue layer 21B may be used.
It can be easily imagined that the deeper the guide groove 23 is, the better the function is.

Note that an alignment film (not shown) is formed on each of the surfaces of the first substrate 6 and the second substrate 19 facing each other. From this state, as shown in FIG. 4A, a sealing material 24 made of a thermosetting epoxy resin is applied onto the guide groove 23 of the second substrate 19 using a dispenser. Subsequently, the accurately weighed liquid crystal 25 is dropped on the central region of the second substrate 19.

Next, as shown in FIG. 4B, the first and second substrates 6 and 19 are adhered to each other, a uniform pressure is applied to the entire surface, and the liquid crystal 25 is spread inside the sealing material 24.
After the gap between the substrates 6 and 19 is kept constant, the sealing material 24 is fired. In this bonding, the fluid sealing material 24 is guided by the guide groove 23 and its spread is controlled with high precision.

Incidentally, the sealing material 24 is
It is preferable to supply them to such an extent that the inside is completely filled. Further, when the sealing material 24 protrudes from the guide groove 23, although the sealing function is surely provided, high-precision seal dimensional accuracy cannot be expected. Therefore, as shown in FIG. When the second substrate 19 is cut along the line with a diamond cutter or the like, the seal shape becomes highly accurate.

When the guide groove 25 is formed in the area where the seal is formed as described above, the external dimensions of the seal can be accurately maintained as described above. (D) Description of Fourth Embodiment of the Present Invention In the above-described liquid crystal panel, two substrates are bonded by the following steps.

First, as shown in FIG. 5A, a sealing material 16 is applied to the inner side of the peripheral portion of the second substrate 7, and a liquid crystal 17 is supplied to the central portion thereof. As shown in b), the first and second substrates 6 and 7 are bonded together in a chamber (not shown) under a reduced pressure atmosphere. In this case, in order to increase the bonding accuracy in the chamber, the mechanism becomes complicated and the whole apparatus becomes expensive. Therefore, FIG.
As shown in (c), the displacement between substrates in vacuum was 10
After performing rough bonding so as to fit within 0 μm, the first and second substrates 6 and 7 are taken out to the atmosphere, and the substrates 6 and 7 are relatively oriented in a plane direction as shown in FIG. The sealing material 16 is hardened again by sliding to a high precision. Thereafter, as shown in FIG. 5E, the peripheral portion of the second substrate is cut off.

When the substrates 6 and 7 are relatively slid as shown in FIGS. 5C and 5D, the shape of the sealing material 16 is disturbed. Substrate 7
If a guide groove is formed in the vicinity of the peripheral edge of the seal member and the sealing material 16 is applied along the guide groove, disturbance of the seal shape is suppressed, and seal leakage due to the disturbance is eliminated.

However, when the two substrates 6 and 7 slide in the air, the shape of the transfer disposed between the first substrate 6 and the second substrate 7 may be defective. This transfer is formed for drawing out the common electrode formed on the second substrate 7 to the first substrate 6. Therefore, as shown in FIG. 6A, when the guide groove 15 is formed in the region where the sealing material 16 is applied,
A concave portion 26 is formed in the transfer arrangement region. The recess 26 may be formed in the overcoat layer 14 as shown in the drawing, or may be formed in the color filter layer as in the third embodiment.

In this state, when the first substrate 6 and the second substrate 7 are bonded according to the process shown in FIG. 5, even if the substrates 6 and 7 are slid when re-aligned in the atmosphere, the transfer 27 is not Since the shape of the transfer 27 is less likely to collapse, the shape of the transfer 27 is kept constant even after re-alignment, and the conductivity, which is the original function, is improved. In addition, as a material of the transfer 27, for example, there is a spherical material in which a silver paste or an ultraviolet curable adhesive is coated with nickel or gold.

As described above, when the outside of the guide groove 15 of the second substrate 7 is cut off after bonding, the result is as shown in FIG. 6B. The transfer is formed in a circular area as shown in the plan view of FIG. (E) Description of the Fifth Embodiment of the Present Invention In the above-described embodiment, one seal is formed in the seal formation area of the second substrate.
Although the guide grooves are formed, a plurality of narrow guide grooves may be formed in the area.

For example, as shown in the plan view of FIG.
A plurality of thin guide grooves 15A are formed in parallel in the seal formation region of the overcoat layer 14, and the other structure is the same as that of the second embodiment. Then, the second substrate 7 having the plurality of guide grooves 15A formed thereon and the first substrate 6 are bonded together in a process as shown in FIG. In this step, after bonding the two substrates 6 and 7 in a vacuum, the sealing material 16 is exposed to the air in an uncured state, so that the outside of the sealing material 16 is exposed to the outside air, and the inside thereof is vertically Since the liquid crystal 17 which is stressed in the direction is touched, air bubbles are inevitably mixed into the sealing material 16 in a relatively short time.

However, in this embodiment, since a plurality of guide grooves 15A having a width smaller than that of the seal are formed in parallel in the inner and outer directions of the substrate 7, even if air bubbles enter from the outside, the air bubbles 15B remain As shown in FIG. 7 (b), it is easy to proceed along the guide groove 15A on the side closer to the outside, so that the phenomenon of seal breakage is reduced. On the other hand, according to one guide groove 15, as shown in FIG. 8, the bubbles B can easily advance toward the inside of the substrate, so that the seal is broken as compared with the case where many guide grooves 15A are formed. It is likely to occur.

This structure may be applied to the panel when the liquid crystal is sealed in the panel by a vacuum suction method as shown in FIG. (F) Description of Sixth Embodiment of the Present Invention FIG. 9 is a perspective view showing a method of manufacturing a panel according to a sixth embodiment of the present invention and a plan view showing a pixel region.

First, as shown in FIG. 9A, two substrates 30 and 31 constituting an active matrix type liquid crystal display panel having a display area of about 10 inches diagonally are prepared. As shown in FIG. 9B, the first substrate 30 includes a plurality of thin film transistors (TFTs) 32 arranged in a matrix on a glass substrate 30A and a plurality of pixel electrodes 33 connected to the source electrode. With TFT
A gate bus line 34 is connected to the gate electrode 32, a data bus line 35 is connected to the drain electrode, and the gate bus line 34 and the data bus line 35 are arranged in a direction orthogonal to each other via an insulating film.

As shown in FIG. 10A, the second substrate 31 has a color filter 36 formed on a glass substrate 31A and a common electrode 37 made of ITO. From this state, as shown in FIGS. 9A and 10A, a photosensitive polyimide is finally formed on the second substrate 31 by means of spin coating or the like so that the gap between the substrates is equal to the gap between the substrates. After being scattered to a thickness of, for example, 5 μm, it is exposed and developed to remove unnecessary portions, and a rectangular inner and outer convex patterns 40 and 41 having a width of 0.5 mm surrounding the display area. Are formed such that their respective intervals are, for example, 0.5 mm.

Similarly, photosensitive polyimide is applied to the first substrate 30 to a thickness of 5 μm, unnecessary portions are removed by exposure and development, and a third convex shape of 0.5 mm width surrounding the display area. The pattern 42 is formed. This third convex pattern 42
Are two convex patterns 40 and 41 on the second substrate 31 in a state where the first substrate 30 and the second substrate 31 face each other.
It is formed in a size and position that fits between the two.

After this, the first and second substrates 30, 31
On top of this, alignment films 44 and 45 made of a polyimide resin having a thickness of 1000 ° are formed by printing or the like.
A rubbing treatment is applied to the surfaces of 4, 45. After this, FIG.
As shown in (a), a spherical spacer 45 having a diameter of 5 μm is sprayed on the first substrate 30. Subsequently, as shown in FIGS. 9 (a) and 10 (a), a sealing material 46 made of an ultraviolet curable adhesive is applied along the outer portion of the outer convex pattern 41 on the second substrate 31. After that, the accurately weighed liquid crystal 47 is dropped at the center of the second substrate 32.

Next, as shown in FIG. 10B, the first and second substrates 30 and 31 are adhered to each other, and a uniform pressure is applied to the entire surface. After the liquid crystal 46 is spread all over the substrate and the gap between the substrates 30 and 31 is constant at 5 μm, the ultraviolet curable adhesive is irradiated with ultraviolet rays to be cured. According to the structure as described above, the three convex patterns 40 to 42 are alternately meshed with each other and the substrates 30 and 31 are adhered to each other, so that the spread of the seal material 46 is suppressed and the shape of the seal is reduced. It is controlled with high precision.

Although the dropping method for forming a panel has a great advantage as compared with the liquid crystal suction method shown in FIG. 13, according to the conventional structure shown in FIG. 14, an adhesive used as a sealing material is not used. Since the adhesive comes into contact with the liquid crystal before curing, the components of the adhesive may dissolve into the liquid crystal and contaminate the liquid crystal. Further, liquid crystal may enter between the sealant and the first substrate, and the adhesive strength may be reduced.

However, in the present embodiment, in the region between the liquid crystal 47 and the sealing material 46,
Since the sealing materials 46 are formed, the sealing material 46 does not contaminate the liquid crystal 47 and the adhesive strength between the substrates 30 and 31 and the sealing material 46 does not decrease. If only one convex pattern is provided on one of the substrates 30 and 31, when the two substrates are bonded together, the adhesion between the substrate and the step pattern is not sufficient, and the liquid crystal extends from between them to the seal. Because of the leakage, the effect of blocking the liquid crystal and the adhesive by the step pattern is not sufficient.

By the way, a guide groove (not shown) is formed in a region where the sealing material 46 is applied, and the shape of the sealing material 46 can be controlled with high precision by suppressing the outward spread of the sealing material 46 when bonding the substrates. Good. The details thereof have been already described in the above embodiment, and will not be described. (G) Description of the Seventh Embodiment of the Present Invention In the above-described sixth embodiment, a plurality of convex patterns that mesh with each other are formed along the periphery of the two substrates. The embodiment will be described below.

FIG. 11 is a perspective view showing the state of lamination of substrates according to the eighth embodiment of the present invention, and a partial sectional view showing the laminated substrate. In this embodiment, two substrates 30 and 31 having the same structure as in the sixth embodiment are used. Then, a thickness of 2.5 μm and a width of 0.
5 mm convex patterns 48 and 49 are formed at positions facing each other.

Thereafter, the first and second substrates 30, 31
Are formed on the display region with a thickness of 1000 ° made of polyimide resin, and the surfaces thereof are subjected to a rubbing treatment. Next, after the spacers 45 are sprayed on the first substrate 30, a sealing material 50 made of an ultraviolet-curable adhesive is applied along the outer periphery of the convex patterns 48 and 49 of the second substrate 31.
Is applied thicker than 5 μm, and a liquid crystal 47 is dropped on the center of the second substrate 31.

Thereafter, the first and second substrates 30, 31
The convex patterns 48 and 49 are opposed to each other, and a uniform pressure is applied to the entire surface so that the gap between the two substrates 3 is 5 μm.
Attach 0, 31. Subsequently, the sealing material 50 is irradiated with ultraviolet rays to be cured. According to the above configuration,
The sealing material 50 and the liquid crystal 47 are mutually convex patterns 48, 4.
9 because it is no longer touched by being shielded by 9
As in the embodiment, the liquid crystal 47 depends on the components of the sealing material 50.
Will not be contaminated.

Moreover, the shape of the sealing material 50 is accurately controlled by the convex patterns 48 and 49. by the way,
A guide groove (not shown) may be formed in a region where the seal material 50 is applied, and the shape of the seal material 50 may be controlled with high precision by suppressing the outward spread of the seal material 50 when bonding the substrates. The details have been described in the first to sixth embodiments, and a description thereof will be omitted. (H) Description of the eighth embodiment of the present invention In the above-described sixth embodiment, a plurality of protrusion patterns that mesh with each other are formed along the periphery of two substrates, or in the seventh embodiment, they are joined to each other. Although a convex pattern is formed, the contamination of the liquid crystal may be prevented by changing the structure of the sealing material, and an embodiment thereof will be described below.

FIG. 12 is a perspective view showing a state in which substrates are bonded to each other according to the eighth embodiment of the present invention, and a partial sectional view showing the bonded substrates. Also in this embodiment, although not particularly shown, two substrates 30 having the same structure as the sixth embodiment,
31 is used. And the first and second substrates 30, 31
As in the sixth embodiment, an alignment film made of a polyimide resin having a thickness of 1000 ° is formed in the display region of No. 6, and its surface is rubbed. Subsequently, a spherical spacer having a diameter of 5 μm is sprayed on the first substrate 30 as in the seventh embodiment.

Next, using a dispenser, FIG.
A seal pattern (seal material) 51 made of an epoxy-based thermosetting adhesive is formed so as to surround the display area of the second substrate 31 as shown in FIG. Subsequently, using a dispenser, a low-viscosity silicon-based UV-curable resin having excellent liquid crystal resistance is dropped on the seal pattern 51 to form a thin film 52.

Next, a predetermined amount of liquid crystal 47 is dropped at the center of the second substrate 31. After this, the two substrates 30, 31
Are applied, uniform pressure is applied to the entire surface, the liquid crystal 47 is spread all over the area surrounded by the seal pattern 51, and when the gap between the substrates 30 and 31 becomes constant, the coating 52 is irradiated with ultraviolet rays. After this is cured, the seal pattern 51 is heated to cure it.

According to the above configuration, since the liquid crystal 47 and the seal pattern 51 are prevented from coming into contact with each other by the liquid crystal resistant film 52, the components of the adhesive forming the seal pattern 51 are dissolved and the liquid crystal 47 is melted. Is not contaminated, and the bonding strength between the seal pattern 51 and the second substrate 51 is not reduced. Moreover, since the coating 52 is made of an ultraviolet curable resin having good liquid crystal resistance, the liquid crystal 47 is hardly contaminated. In addition, since the adhesion between the coating 52 made of an ultraviolet curable resin and the substrate 31 is good, the adhesiveness of the seal pattern 51 does not decrease.

By the way, in the region where the seal pattern 51 is formed, a groove 60 is formed as shown by a dashed line, and the spread of the seal pattern 51 and the coating film 52 is suppressed at the time of bonding the substrates, so that the shape can be adjusted with high precision. You may make it control. The details thereof have been already described in the first to sixth embodiments, and a description thereof will be omitted. Note that the convex pattern described in the sixth and seventh embodiments may be provided adjacent to the display area side of the seal pattern 51.

[0065]

As described above, according to the present invention, a convex pattern that alternately meshes with the inside of a region to be coated with a sealing material of two opposing substrates or a convex pattern that opposes and joins each other. Is formed on those substrates, and liquid crystal is supplied to the substrates before the substrates are bonded, so that the contact between the liquid crystal between the substrates and the sealing material is cut off by a convex pattern, and the components of the sealing material Liquid crystal contamination can be prevented. In addition, the liquid crystal does not enter the space between the substrate and the sealing material beyond the sealing material, so that a decrease in the adhesive strength between the sealing material and the substrate can be suppressed.

Further, since the liquid crystal resistant film is formed on the sealing material formed on the substrate, it is possible to prevent the components of the sealing material from being mixed into the liquid crystal. A groove is formed in a portion surrounding the display area of at least one of the two substrates, and the sealing material is supplied to the groove. It is regulated by the groove, and the shape of the sealing material can be made highly accurate.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view and a partial plan view showing a second embodiment of the present invention.

FIG. 3 is a partial sectional view showing a second embodiment of the present invention.

FIG. 4 is a partial sectional view showing a third embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing an example of the bonding of the substrates according to the embodiment of the present invention.

FIG. 6 is a sectional view and a partial plan view showing a fourth embodiment of the present invention.

FIG. 7 is a partial plan view showing a fifth embodiment of the present invention.

FIG. 8 is a partial plan view showing a conventional example.

FIG. 9 is a perspective view and a partial plan view showing a sixth embodiment of the present invention.

FIG. 10 is a partial sectional view showing a seventh embodiment of the present invention.

FIG. 11 is a perspective view and a partial sectional view showing an eighth embodiment of the present invention.

FIG. 12 is a partial sectional view showing a ninth embodiment of the present invention.

FIG. 13 is a perspective view and a sectional view showing a first conventional example.

FIG. 14 is a perspective view showing a second conventional example.

[Explanation of symbols]

 1, 2 substrate 3 guide groove 4 sealing material 5 liquid crystal 6, 7, 19 substrate 15, 23, 15A guide groove 16, 24 sealing material 26 concave portion 27 transfer 30, 31 substrate 40, 41, 42, 48, 49 convex pattern 46, 50 Sealing material 51 Sealing material 52 Coating

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Katsufumi Omuro 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Seiji Tanuma 1015 Kamikodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (72) Inventor Takemune Mayama 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-3-17625 (JP, A) JP-A-6-208097 (JP, A) JP-A-6-194615 (JP, A) JP-A-58-117522 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1339 505 G02F 1/1341

Claims (7)

(57) [Claims] A step of forming at least one first convex pattern around a display area of the first substrate; and forming a second convex pattern alternately meshed with the first convex pattern. Forming at least one around a display region of the second substrate; supplying a sealant around a region where the first convex pattern and the second convex pattern are formed; Dropping a predetermined amount of liquid crystal onto one of the display area of the substrate or the display area of the second substrate, and bonding the first substrate and the second substrate via the sealant A method for manufacturing a liquid crystal display panel, comprising: a step of curing the sealing material. 2. A step of forming at least one first convex pattern around a display area of a first substrate, and a second convex pattern joined to face the first convex pattern. Forming a sealing material around any one of the first convex pattern or the second convex pattern; and forming the first substrate on the first substrate. A step of dropping a predetermined amount of liquid crystal on one of a region surrounded by the convex pattern or a region of the second substrate surrounded by the second convex pattern; and A method for manufacturing a liquid crystal display panel, comprising: a step of bonding one substrate and the second substrate; and a step of curing the sealant. 3. A step of forming a sealant made of an adhesive around a display area of either the first substrate or the second substrate, and forming a liquid crystal-resistant film on the sealant. A step of dropping a predetermined amount of liquid crystal on the display region of one of the first substrate and the second substrate; and the first substrate and the second substrate via the sealing material and the coating. A method for manufacturing a liquid crystal display panel, comprising: a step of bonding two substrates; and a step of curing the sealant and the coating. 4. The liquid crystal display panel according to claim 1, wherein a groove is formed in a region of the first substrate or the second substrate where the sealing material is formed. Manufacturing method. 5. The method for manufacturing a liquid crystal display panel according to claim 1, wherein the bonding step is performed in a reduced pressure atmosphere. 6. The bonding step includes a step of performing rough bonding in a reduced-pressure atmosphere, and a step of performing re-alignment in the atmosphere with higher accuracy than the rough bonding step. The method for manufacturing a liquid crystal display panel according to claim 1, 2, 3, or 4. 7. The method according to claim 7, wherein after the first substrate and the second substrate are bonded, a portion of the first substrate or the second substrate which is outside the sealing material is cut. A method for manufacturing a liquid crystal display panel according to claim 1.