JPH11223819A - Production of liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a spacer in a specified region between substrates by laminating two substrates with a spacer interposed inbetween to face their electrodes to each other and injecting a liquid crystalline compsn. into the gap between the laminated two substrates. SOLUTION: After a wiring part 32, a transistor part and a transparent electrode part 33 are formed on the surface of one glass substrate 31, a liquid crystal orientation film 34 comprising a polyimide is formed all over the surface. The a UV-curing adhesive layer 35 is selectively irradiated with UV rays through the openings of a mask 38. In this process, the adhesion property of the adhesive layer 35 to the orientation film 34 is lost in the region irradiated with UV rays. Then the whole surface is irradiated with UV rays to harden the residual adhesive layer 35 to form a spacer 40 on the orientation film 34 corresponding to the wiring part 32 and the transistor part. The other substrate is stacked in such a manner that the alignment film of the other substrate is in contact with the spacer 40 and that a sealing agent is applied around the substrate, then the two substrate are laminated by pressurizing. A liquid crystal is injected into the gap between the two glass substrates 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a liquid crystal display device.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional liquid crystal display device comprises a substrate 5 having electrodes 1 and 2 and liquid crystal alignment films 3 and 4;
A gap for injecting liquid crystal is secured between the substrates 5 and 6 by dispersing a spherical spacer 7 between the substrates 6.
However, when such a spherical spacer 7 is used, it is difficult to spray the spacer only on the wiring portion 8 of the substrate 5, and the wiring portion 8, the transistor portion (not shown), and the transparent electrode portion 9 are not provided. The spacers 7 are scattered in all the regions such as. When the spacers are also spread on the transparent electrode portion, the light of the backlight is blocked or scattered, which causes a decrease in brightness and contrast of the liquid crystal display device. Further, since the spherical spacer is not fixed between the substrates, the spacer moves at the time of liquid crystal injection or the like and causes aggregation.
As a result, the gap between the two substrates becomes non-uniform, which causes poor liquid crystal alignment of the liquid crystal display device.

On the other hand, the sealing portion of a conventional liquid crystal display element uses a sealing agent made of a thermosetting resin. However, the curing condition of this sealing agent by heating is 150 to 160, which is about one hour. Time processing is required. Therefore, when an ultraviolet curable resin is used instead of the thermosetting resin, the curing reaction is completed in a short time, and the processing time can be reduced.

However, ultraviolet curable resins have poor durability, and radically polymerizable acrylic resins have problems with water resistance and moisture permeability. Further, in the case of a cationic polymer type or radical polymer type epoxy resin, there is a problem that unreacted components are eluted into the liquid crystal, causing poor alignment of the liquid crystal and deteriorating image quality. Further, there is a problem that the ultraviolet rays cannot reach the ultraviolet-curable resin due to the influence of the metal wiring portion of the liquid crystal display element, and the uncured sealant remains, thereby causing poor alignment of the liquid crystal and deteriorating the image quality.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a liquid crystal display device which can fix a spacer in a predetermined region between substrates. Another object of the present invention is to provide a method for manufacturing a liquid crystal display device that can form a dense and high-strength seal portion between substrates with high accuracy.

Still another object of the present invention is to form a seal portion having excellent resistance to moisture and gas in the air and having a property of less adversely affecting liquid crystal molecules with high adhesion between substrates. It is an object of the present invention to provide a method of manufacturing a liquid crystal display device capable of performing the above.

Still another object of the present invention is to eliminate the uncured sealant in the ultraviolet light shielding portion by the metal wiring portion of the substrate to be bonded, and to manufacture a liquid crystal display device excellent in durability without defective liquid crystal alignment and image quality. It seeks to provide a way.

[0008]

According to a method of manufacturing a liquid crystal display device according to the present invention, after forming electrodes on the surfaces of two substrates, an alignment film is coated on the electrode surfaces of each of the substrates, and alignment processing is performed. And applying a tape in which the UV-curable resin layer is coated on one side to the alignment surface of one substrate so that the UV-curable resin layer is in contact with the alignment film, and then the UV-curable resin layer Irradiation of ultraviolet light to the area other than the area where the spacer is to be formed reduces the adhesiveness of the ultraviolet curable resin layer in the irradiated area, and further removes the ultraviolet curable resin layer part in the irradiated area by peeling off the tape. Forming a spacer by the remaining resin layer portion, bonding the two substrates so that their electrodes are opposed to each other with the spacer interposed therebetween, and between the bonded two substrates. It is characterized in that comprising the step of injecting the eutectic composition.

Another method of manufacturing a liquid crystal display device according to the present invention comprises the steps of forming electrodes on the surfaces of two substrates, then covering the electrode surfaces of the substrates with an alignment film, and performing an alignment process; A light irradiation-curable adhesive containing a cationic polymerization type epoxy resin, a cationic polymerization type photoreaction initiator, a radical polymerization type acrylic resin, and a radical polymerization type photoreaction initiator is sandwiched between the two substrates around their peripheral portions. In the above, the radical polymerization type acrylic resin is polymerized with the radical polymerization type photoreaction initiator by light irradiation and temporarily fixed, and after the temporary fixing, light irradiation is performed while aligning the two substrates. Bonding the cation polymerization type epoxy resin by polymerizing the cation polymerization type epoxy resin with the cation polymerization type photoinitiator to form a seal portion, and a liquid crystal set between the two bonded substrates. It is characterized in that comprising the step of injecting the object.

[0010] Still another method of manufacturing a liquid crystal display device according to the present invention is to form electrodes on the surfaces of two substrates, cover the electrode surfaces of the substrates with an alignment film, and perform an alignment process. A first sealant containing a cationic polymerization type epoxy resin and a cationic polymerization type photoreaction initiator, and a second sealant containing a radical polymerization type acrylic resin and a radical polymerization type photoreaction initiator on at least one substrate. The first sealing agent is applied to the periphery of the alignment surface so as to be located outside, and the two substrates are overlapped so that their electrodes are opposed to each other with the sealing agent interposed therebetween, and then, light irradiation is performed. A step of bonding the two substrates by forming two layers of seal portions in a horizontal direction on the substrate surface, and a step of injecting a liquid crystal composition between the two bonded substrates. And it is characterized in and.

According to still another method of manufacturing a liquid crystal display device according to the present invention, after forming electrodes on the surfaces of two substrates, respectively, covering an electrode surface of each of the substrates with an alignment film and performing alignment processing. After applying a sealing agent containing an ultraviolet-curable resin to the periphery of the alignment surface of at least one of the substrates and irradiating the applied surface with ultraviolet rays of 150 mJ / cm ² or less,
By laminating two substrates so that their electrodes face each other with the sealing agent interposed therebetween, further irradiating ultraviolet light from the substrate side to perform full curing of the ultraviolet curable resin to form a seal portion A step of bonding the two substrates, and a step of injecting a liquid crystal composition between the two substrates bonded.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
This method of manufacturing a liquid crystal display device comprises the steps of forming electrodes on the surfaces of two substrates and then covering the electrode surfaces of the substrates with an alignment film and performing an alignment treatment. After the tape in which the curable resin layer is coated on one side is adhered so that the ultraviolet curable resin layer is in contact with the alignment film, the ultraviolet curable resin layer is irradiated with ultraviolet light in a region other than a portion where a spacer is to be formed. Reducing the adhesiveness of the UV-curable resin layer in the irradiated area, and removing the tape to remove the UV-curable resin layer in the irradiated area to form a spacer with the remaining resin layer. And a step of bonding the two substrates so that their electrodes face each other with the spacer interposed therebetween, and a step of injecting a liquid crystal composition between the two bonded substrates.

According to the present invention, a tape in which an ultraviolet-curable resin layer is coated on one side of an oriented surface of a substrate is adhered so that the ultraviolet-curable resin layer is in contact with the alignment film. By irradiating the region of the ultraviolet-curable resin layer other than the portion where the spacer is to be formed with ultraviolet rays, the adhesiveness of the ultraviolet-curable resin layer in the irradiated region is reduced. Thereafter, by peeling the tape, the ultraviolet-curable resin layer portion in the irradiation area is peeled off from the alignment surface of the substrate, and the remaining resin layer portion forms a spacer.
By irradiating the spacers with ultraviolet light to fix them tightly to a predetermined area of the substrate, the spacers can be arranged between the substrates without causing aggregation as in the related art, so that the gap between the substrates can be secured with high precision. it can. After the formation of such a spacer, the two substrates are attached to each other with the spacer interposed therebetween so that their electrodes are opposed to each other, and a liquid crystal is injected between the gaps to produce a liquid crystal display device in which the liquid crystal is well aligned. can do.

Next, another method of manufacturing a liquid crystal display device according to the present invention will be described. The manufacturing method of this liquid crystal display device is as follows.
After forming electrodes on the surfaces of the two substrates, respectively, covering an electrode surface of each of the substrates with an alignment film and performing an alignment process;
A light irradiation-curable adhesive containing a cationic polymerization type epoxy resin, a cationic polymerization type photoreaction initiator, a radical polymerization type acrylic resin, and a radical polymerization type photoreaction initiator is sandwiched between the two substrates around their peripheral portions. In the above, the radical polymerization type acrylic resin is polymerized with the radical polymerization type photoreaction initiator by light irradiation and temporarily fixed, and after the temporary fixing, light irradiation is performed while aligning the two substrates. Bonding the cation polymerization type epoxy resin by polymerizing the cation polymerization type epoxy resin with the cation polymerization type photoinitiator to form a seal portion; and injecting a liquid crystal composition between the two bonded substrates. Have.

The operation of the method for manufacturing a liquid crystal display device will be described with reference to FIGS. As shown in FIG. 1A, two substrates 21 and 2 which have been
A light-curing adhesive 25 including a cationic polymerization type epoxy resin, a cationic polymerization type photoreaction initiator 23, a radical polymerization type acrylic resin, and a radical polymerization type photoreaction initiator 24 is sandwiched between the peripheral portions between the two. Contact In addition, 26 in FIG. 1A is a polyfunctional polymer. Subsequently, as shown in FIG.
Light irradiation, for example, irradiation of a radical polymerization type photoreaction initiator with a laser beam having a maximum absorption wavelength is performed while lightly pressurized toward 1. By irradiating the laser beam, the double bonds of the radical polymerization type acrylic resin are reacted and polymerized by the radical polymerization type photoreaction initiator, so that the light irradiation curing in which the substrates 21 and 22 are polymerized. Temporarily fixed by the mold adhesive 27. After the temporary fixing, the two substrates 2
Light irradiation, for example, ultraviolet irradiation is performed while aligning 1, 22 with the cation polymerization type epoxy resin to cure the cation polymerization type epoxy resin. By the second light irradiation, as shown in FIG. 1C, the epoxy ring in the crosslinked structure of the cationic polymerization type epoxy resin is opened by the cationic polymerization type photoreaction initiator, and the molecular weight between crosslinks is small. A seal portion 28 made of a cured product having a dense structure is formed. Accordingly, a dense and high-strength seal portion 28 can be accurately formed between the substrates 21 and 22, and a liquid crystal display device in which the liquid crystal is well aligned by the subsequent injection of the liquid crystal composition between the substrates. Can be manufactured.

Next, a method of manufacturing still another liquid crystal display device according to the present invention will be described. This method of manufacturing a liquid crystal display device comprises the steps of forming electrodes on the surfaces of two substrates, coating the electrode surfaces of the substrates with an alignment film, and performing an alignment treatment. A first sealant containing a photoreaction initiator of a mold type and a second sealant containing a radical polymerization type acrylic resin and a photoreaction initiator of a radical polymerization type on the periphery of the alignment surface of at least one substrate; Is applied on the outside,
After overlapping the two substrates with the electrodes facing each other with the sealing agent interposed therebetween, the substrate is irradiated with light to form a two-layer seal portion in a horizontal direction on the substrate surface. The method includes a step of bonding two substrates, and a step of injecting a liquid crystal composition between the two bonded substrates.

According to the present invention, the first seal portion made of a polymer of the cationic polymerization type epoxy resin has the outer side,
The second seal portion made of a polymer of a radical polymerization type acrylic resin can be disposed so as to be located inside the first seal portion. The first seal portion is made of a polymer of a cationic polymerization type epoxy resin, and is dense and excellent in water pressure resistance.
The second seal portion is made of a polymer of a radical polymerization type acrylic resin, has a dense cross-linked structure by light irradiation with low power, and does not elute unreacted components into the liquid crystal composition. However, the crosslinked structure of the polymer of the radical polymerization type acrylic resin is destroyed by the influence of moisture and heat, and the decomposed components and moisture elute into the liquid crystal composition. Therefore, a radical polymerization type having a property in which the first seal portion made of a polymer of a cation polymerization type epoxy resin that is dense and excellent in water pressure resistance has a dense cross-linked structure outside and a non-reacted component does not elute into the liquid crystal composition. The double-layered seal portion in which the second seal portion made of an acrylic resin polymer is disposed inside has excellent resistance to moisture and gas in the air and has a property of less adversely affecting liquid crystal molecules. . As a result, a double-layered seal portion is formed between the substrates subjected to the alignment treatment and bonded together,
By injecting a liquid crystal composition between the substrates, it is possible to provide a method for manufacturing a liquid crystal display device having excellent voltage holding ratio and orientation.

Next, a method of manufacturing still another liquid crystal display device according to the present invention will be described. This method of manufacturing a liquid crystal display device comprises the steps of forming electrodes on the surfaces of two substrates, coating an electrode layer on each of the substrates with an alignment film, and performing an alignment treatment. Is applied with a sealing agent containing an ultraviolet curable resin,
After irradiating ultraviolet rays of not more than mJ / cm ² , the two substrates are overlapped so that their electrodes are opposed to each other with the sealing agent interposed therebetween. The method includes a step of bonding the two substrates by forming a seal portion by performing full curing of the resin, and a step of injecting a liquid crystal composition between the two bonded substrates.

The energy in the preliminary ultraviolet irradiation is defined as follows: if the preliminary ultraviolet irradiation exceeds 150 mJ / cm ² , the curing at the time of sealing proceeds excessively, and the bonding strength of the two substrates thereafter decreases. Because you do.
Note that a step of heating after the lamination to accelerate the curing of the sealant may be added.

According to the present invention, a sealant containing an ultraviolet-curable resin is applied to the periphery of the alignment surface of at least one substrate, and the applied surface is irradiated with low-energy ultraviolet rays of 120 mJ / cm ² or less. By disassembling the starting material on the surface of the seal portion slightly by avoiding the problem that the shadow portion of the metal wiring etc. becomes unirradiated or the like as in the case of irradiating ultraviolet rays after overlapping with another substrate, Can be cured. Thereafter, the two substrates are stacked so that their electrodes face each other with the sealing agent interposed therebetween, and further, by irradiating ultraviolet light from the substrate side, the curing of the ultraviolet curable resin proceeds. A seal portion having a chemically stable structure can be formed. By injecting the liquid crystal composition between the two substrates thus adhered, it is possible to prevent the remaining uncrosslinked material in the seal portion from being eluted into the liquid crystal composition, and thus to obtain an excellent voltage holding ratio and liquid crystal alignment. A liquid crystal display device having a property can be manufactured.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Example 1) First, as shown in FIG. 2A, a wiring portion 32, a transistor portion (not shown), and a transparent electrode portion 33 are formed on the surface of one glass substrate 31, and then the entire surface is made of polyimide. The liquid crystal alignment film 34 was formed. Subsequently, a protective tape 36 on which an ultraviolet-curable pressure-sensitive adhesive layer 35 containing an acrylic resin is stuck so that the pressure-sensitive adhesive layer 35 abuts on the alignment film 34 of the glass substrate 31. Layer 35 was pressed so that its thickness was 5-6 μm. The protective tape with an adhesive layer used was Adwill D series (trade name, manufactured by Lintec Corporation).

Next, as shown in FIG. 2B, a mask 38 having a shielding portion 37 formed at a portion corresponding to the wiring portion 32 and the transistor portion is disposed above the protective tape 36, and is not shown. Light intensity 5 from high pressure mercury lamp
0-100 mJ / cm ² , illuminance 30-100 mW / cm
Ultraviolet rays were emitted under the conditions of ² , and the ultraviolet rays were selectively irradiated to the ultraviolet-curable pressure-sensitive adhesive layer 35 through the unshielded portion of the mask 38. At this time, the UV curable pressure-sensitive adhesive layer 35 loses its adhesiveness to the alignment film 34 in the UV irradiation region. Subsequently, as shown in FIG. 2C, the protective tape 36 is peeled off, so that the ultraviolet-curable pressure-sensitive adhesive layer 39 remains only in the wiring section 32 and the transistor section.
Subsequently, as shown in FIG. 2D, the entire pressure-sensitive adhesive layer was cured by irradiating the entire surface with ultraviolet rays to form spacers 40 on the alignment film 34 corresponding to the wiring portion 32 and the transistor portion.

Next, the other glass substrate 43 on which the transparent electrode 41 and the alignment film 42 on the surface are formed in this order is placed on the spacer 40 of the one glass substrate 31 so that the alignment film 42 contacts the spacer 40. Further, the sheets were stacked so that a sealant was disposed around them, and then bonded together under pressure. Thereafter, a liquid crystal 44 was injected into a gap between the glass substrates 31 and 43 to manufacture a liquid crystal display device shown in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG.
Reference numeral 45 in the drawing denotes a transistor section.

In the obtained liquid crystal display device, since the spacers 40 are formed at predetermined positions and are fixed to the alignment film 34, a decrease in the light transmittance of the transparent electrode portion 33 can be avoided.
The brightness and contrast of the display have been improved, the gap accuracy between the substrates 31 and 43 has been improved, and high quality has been achieved.

(Embodiment 2) First, after forming a wiring portion, a transistor portion and a transparent electrode portion on the surface of one glass substrate,
A liquid crystal alignment film made of polyimide was formed on the entire surface. A transparent electrode portion was formed on the surface of the other glass substrate, and a liquid crystal alignment film made of polyimide was formed on the entire surface.
Subsequently, light irradiation including a cation polymerization type epoxy resin, a cation polymerization type photoreaction initiator, a radical polymerization type acrylic resin, and a radical polymerization type photoreaction initiator is applied to the periphery of the liquid crystal alignment film on the other glass substrate. A sealant composed of a curable adhesive was applied by screen printing.

Next, spacers for making the gap uniform were sprayed on the liquid crystal alignment film of the one glass substrate. Subsequently, the other glass substrate coated with the sealing agent is adhered to the one glass substrate, and the laser light having a wavelength of 385 nm is sealed while uniformly pressing until the gap between the substrates becomes about 10 μm. The two glass substrates were temporarily fixed by primary curing by irradiating an agent to polymerize the radical polymerization type acrylic resin in the sealant with a radical polymerization type photoreaction initiator. The two substrates are aligned, pressurized again until the gap between them becomes 5.5 μm, and the sealant is irradiated with ultraviolet light using a metal halide lamp as a light source, and the cationic polymerization type photoinitiator in the sealant is used. Then, the cation polymerization type epoxy resin was polymerized, and secondary curing was performed to form a seal portion. Thereafter, a liquid crystal display device was manufactured by injecting liquid crystal into the gap between the substrates.

The obtained liquid crystal display device satisfies the specifications without any problem in the gap, the voltage holding ratio and the orientation. (Embodiment 3) First, a wiring portion is provided on the surface of one glass substrate.
After forming the transistor portion and the transparent electrode portion, a liquid crystal alignment film made of polyimide was formed on the entire surface. A transparent electrode portion was formed on the surface of the other glass substrate, and a liquid crystal alignment film made of polyimide was formed on the entire surface. Subsequently, the first sealant, the radical polymerization type acrylic resin, and the radical polymerization type light containing a cationic polymerization type epoxy resin and a cationic polymerization type photoinitiator at the periphery of the liquid crystal alignment film on the other glass substrate. A second sealant containing a reaction initiator was applied by a dispenser such that the first sealant was located outside.

Next, spacers for making the gap uniform were sprayed on the liquid crystal alignment film of the one glass substrate. Subsequently, the other glass substrate coated with the first and second sealants is adhered to the one glass substrate, and the power density is 100 mW while uniformly pressing until the gap between the substrates becomes about 5 μm. After irradiating the sealant with ultraviolet rays of / cm ^2, the sealant was heated at 40 ° C. to form a double-layered seal. afterwards,
By injecting liquid crystal into the gap between the substrates, FIG.
The liquid crystal display device having the structure shown in FIG. In addition, 3 in the figure
1 is a wiring portion 32, a transistor portion (not shown) on the surface,
This is one glass substrate on which a transparent electrode portion 33 is formed and an alignment film 34 is formed on a surface including the wiring portion 32 and the like. Reference numeral 43 in the figure is the other glass substrate on which the transparent electrode 41 and the alignment film 42 are formed in this order. 46 in the figure
A first seal portion 47 formed by polymerization of a first sealant disposed outside a peripheral portion between the substrates 31 and 43;
Is a second seal portion formed by ultraviolet polymerization of a second sealant disposed inside the first seal portion at the peripheral portion between the substrates 31 and 43. In the figure, reference numeral 44 denotes a liquid crystal injected into a gap between the substrates 31 and 43 surrounded by the first and second seal portions 46 and 47.

The obtained liquid crystal display device was subjected to a humidity resistance test in which it was left in an atmosphere at a temperature of 80 ° C. and a humidity of 90% for 100 hours. As a result, the liquid crystal display device satisfies the specifications without any problem in the gap, the voltage holding ratio and the orientation after the moisture resistance test.

Embodiment 4 First, as shown in FIG. 6A, a transparent electrode portion 41 is formed on the surface of a glass substrate 43.
Further, a liquid crystal alignment film 42 made of polyimide was formed on the entire surface. Subsequently, a cation polymerization type or radical polymerization type UV-curable epoxy resin sealant is applied to the periphery of the liquid crystal alignment film on the glass substrate by screen printing or a dispenser. Irradiation was performed for 12 seconds under the condition of 10 mW / cm ² .

Next, as shown in FIG. 6B, after forming a wiring portion 32, a transistor portion (not shown) and a transparent electrode portion 33 on the surface of the other glass substrate 31, a liquid crystal made of polyimide is formed on the entire surface. An alignment film 34 was formed. Subsequently, spacers (not shown) for making the gap uniform were sprayed on the liquid crystal alignment film 34 of the other glass substrate 31. Subsequently, the glass substrate 43 having the coating portion irradiated with the ultraviolet rays was adhered to the other glass substrate 31 and irradiated with ultraviolet rays at a power density of 100 mW / cm ² for 30 seconds while applying pressure to make the gap uniform. The coated part was fully cured by heating at 150 ° C. for one hour in an oven to form a seal part 49. Thereafter, a liquid crystal 44 was injected into the gap between the substrates 31 and 43 to manufacture a liquid crystal display.

The obtained liquid crystal display device was subjected to a humidity resistance test in which it was left in an atmosphere at a temperature of 80 ° C. and a humidity of 90% for 100 hours. As a result, the liquid crystal display device satisfies the specifications without any problem in the gap, the voltage holding ratio and the orientation after the moisture resistance test.

Comparative Example 1 First, a transparent electrode portion was formed on the surface of a glass substrate, and a liquid crystal alignment film made of polyimide was formed on the entire surface. Subsequently, a cation polymerization type UV-curable epoxy resin sealant was applied by screen printing to the periphery of the liquid crystal alignment film on the glass substrate to form a sealant-applied portion.

A wiring portion is provided on the surface of the other glass substrate.
After forming the transistor portion and the transparent electrode portion, a liquid crystal alignment film made of polyimide was formed on the entire surface. Then,
Spacers for making the gap uniform were sprayed on the liquid crystal alignment film of the other glass substrate. Subsequently, the glass substrate having the sealant-coated portion was adhered to the other glass substrate, and irradiated with ultraviolet rays for 30 seconds under the condition of a power density of 100 mW / cm ² while applying pressure to make the gap uniform. At 150 ° C. for 1 hour to perform a full curing, thereby forming a seal portion. Thereafter, a liquid crystal display device was manufactured by injecting liquid crystal into the gap between the substrates.

In the obtained liquid crystal display device, there was no abnormality in the orientation in the initial state. Failure occurred and image quality deteriorated.

[0036]

As described in detail above, according to the present invention, it is possible to provide a method of manufacturing a liquid crystal display device having excellent orientation and voltage holding ratio.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a manufacturing process of a liquid crystal display device of the present invention.

FIG. 2 is a sectional view showing a manufacturing process of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a liquid crystal display device obtained by the steps of Example 1.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a sectional view showing a liquid crystal display device manufactured according to a third embodiment of the present invention.

FIG. 6 is a sectional view illustrating a manufacturing process of the liquid crystal display device according to the fourth embodiment of the present invention.

FIG. 7 is a sectional view showing a liquid crystal display device manufactured by a conventional method.

[Explanation of symbols]

 21, 22, 31, 43: a glass substrate; 28, 46, 47, 49: a sealing portion; 34, 42: an alignment film; 40: a spacer;

Claims (4)

[Claims] An electrode is formed on the surfaces of two substrates, and an electrode layer is coated with an alignment film on each of the substrates, and an alignment process is performed. An ultraviolet curable resin layer is formed on the alignment surface of one of the substrates. After the tape coated on one side is brought into close contact with the UV-curable resin layer so that the UV-curable resin layer is in contact with the alignment film, the UV-curable resin layer is irradiated with ultraviolet light in a region other than a portion where a spacer is to be formed. Reduce the adhesiveness of the UV curable resin layer in the area,
Further, a step of removing the ultraviolet curable resin layer portion in the irradiation area by peeling off the tape to form a spacer by the remaining resin layer portion, and forming the two substrates with the electrodes interposed therebetween with the spacer interposed therebetween. A method for manufacturing a liquid crystal display device, comprising: a step of bonding so as to face each other; and a step of injecting a liquid crystal composition between the two bonded substrates. 2. forming electrodes on the surfaces of the two substrates, respectively, covering an electrode surface of each of the substrates with an alignment film and performing an alignment treatment; A polymerizable epoxy resin, a cationic polymerization type photoreaction initiator, a radical polymerization type acrylic resin, and a light irradiation curable adhesive containing a radical polymerization type photoreaction initiator are sandwiched therebetween and brought into contact with each other. The radical polymerization type acrylic resin is polymerized with the photoinitiator and temporarily fixed, and after the temporary fixing, the two substrates are aligned and irradiated with light to perform the cationic polymerization with the cationic polymerization type photoreaction initiator. A step of bonding by forming a seal portion by polymerizing a mold epoxy resin; and a step of injecting a liquid crystal composition between the two bonded substrates. Method of manufacturing a liquid crystal display device that. 3. A step of forming electrodes on the surfaces of the two substrates and then covering the electrode surfaces of the respective substrates with an alignment film and performing an alignment treatment, comprising: a cationic polymerization type epoxy resin and a cationic polymerization type photoreaction. The first sealant containing the initiator and the second sealant containing the radical polymerization type acrylic resin and the radical polymerization type photoreaction initiator are positioned on the periphery of the alignment surface of at least one of the substrates so that the first sealant is located outside. And apply the above 2
The two substrates are overlapped with each other with the electrodes facing each other with the sealing agent interposed therebetween, and then irradiated with light to form a two-layered sealing portion in a horizontal direction on the substrate surface. A method for manufacturing a liquid crystal display device, comprising: a step of bonding substrates; and a step of injecting a liquid crystal composition between the two bonded substrates. 4. After forming electrodes on the surfaces of the two substrates, respectively, covering an electrode surface of each of the substrates with an alignment film and performing an alignment process; A sealing agent containing a resin is applied, and 150 mJ /
After irradiating ultraviolet rays of not more than ² cm ² , the two substrates are stacked so that their electrodes face each other with the sealing agent interposed therebetween, and further, ultraviolet light is irradiated from the substrate side to form the ultraviolet curable resin. A liquid crystal comprising: a step of bonding the two substrates by performing a main curing to form a seal portion; and a step of injecting a liquid crystal composition between the two bonded substrates. A method for manufacturing a display device.