JPH10293314A - Manufacture of display and manufacturing device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a display and a manufacturing device therefor capable of firmly sticking substrates together in manufacturing a display of a construction having two substrates stuck together. SOLUTION: With one of the transparent substrates 1a applied with a sealing material 2 and having transparent substrates 1a, 1b fixed to an upper surface plate 3 and a lower surface plate 4 respectively, these transparent substrates 1a, 1b are arranged by facing each other with the sealing material 2 in between and respective transparent substrates 1a and 1b are pressed down by the upper surface plate 3 and the lower surface plate 4. Under this condition, the sealing material 2 is hardened by irradiation of an ultraviolet ray direct to the sealing material 2 from the outside edge of the transparent substrates 1a, 1b without passing through the transparent substrates 1a, 1b. The sealing material 2 can be completely hardened because the ultraviolet path is not interfered by electrode pattern on the transparent substrate 1a, 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a display device having a structure in which two substrates are bonded to each other, for example, a liquid crystal display device.

[0002]

2. Description of the Related Art A liquid crystal display device has a structure in which liquid crystal is sandwiched between two transparent substrates on which electrode patterns are formed. A sealing material made of a thermosetting or ultraviolet-curing resin is applied to one transparent substrate, and a sealing material made of an ultraviolet-curing resin is applied to the outer portion and the other transparent substrate for temporary fixing. These transparent substrates are opposed to each other with a sealing material interposed therebetween, and are pressed together. In this state, the sealing material is irradiated with ultraviolet rays to cure the sealing material.

[0003]

Conventionally, as shown in FIG. 6, ultraviolet rays were radiated from the upper or lower surfaces of the transparent substrates 1a and 1b, and the ultraviolet rays passed through the transparent substrates 1a and 1b were guided to a sealing material. . However, since the electrode patterns are formed on the transparent substrates 1a and 1b, ultraviolet rays are blocked by the electrode patterns, so that a sufficient amount of ultraviolet rays cannot be applied to the sealing material 2. Therefore, there is a problem that the sealing material 2 is completely Did not cure. If the sealing material 2 is left uncured, crystal contamination of the sealing material 2 causes problems such as a decrease in bonding strength between the transparent substrates 1a and 1b. For this reason, conventionally, design measures such as forming an electrode pattern so as to avoid the irradiation position of ultraviolet rays have been taken, and the production has been troublesome.

When radiation passes through the liquid crystal layer between the transparent substrates 1a and 1b, polyimide (PI) constituting liquid crystal is formed.
The decomposition may cause problems such as a change in the tilt angle of the liquid crystal, contamination by ions generated by the photovoltaic effect, a change in optical characteristics, and a deterioration in image quality.

Conventionally, it has been common practice to place one of the transparent substrates 1a and 1b on a stage made of quartz and irradiate radiation from the lower surface of the stage. However, quartz is difficult to process and has low strength, so that there is a problem that it is costly to manufacture the stage and the stage is easily broken.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to completely use a sealing material when manufacturing a display device having a structure in which two substrates are bonded via a sealing material. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus of a display device which can be hardened to bond these substrates firmly.

[0007]

According to a first aspect of the present invention, there is provided a method of manufacturing a display device having two substrates adhered to each other via a sealing material. Formed of a material that is cured by ultraviolet light, the sealing material is attached to at least one of the substrates, and the two substrates are brought into close contact with the sealing material interposed therebetween, and pass through the substrate from outside the end face of the substrate. The sealing material is cured by irradiating the sealing material directly with ultraviolet rays without causing the sealing material to cure.

According to a second aspect of the present invention, in the method of manufacturing a display device according to the first aspect, one of the substrates is fixed to a first jig, and the other of the substrates is fixed to a second jig. In this state, the two substrates are opposed to each other with the sealing material interposed therebetween, and the sealing material is irradiated with ultraviolet rays while pressing the substrates by the first and second jigs.

According to a third aspect of the present invention, in the method of manufacturing a display device according to the second aspect, the ultraviolet light obliquely incident on the substrate surface of the opposed substrate is directly passed without passing through the substrate. The first and second jigs are processed into a tapered shape so as to irradiate the sealing material.

According to a fourth aspect of the present invention, in the method for manufacturing a display device having two substrates adhered to each other via a sealing material, the sealing material is formed of a resin which is cured by ultraviolet rays. A reflecting mirror is disposed on the outer surface side of at least one of the substrates with the sealing material interposed therebetween, and the ultraviolet light reflected by the reflecting mirror passes through the substrate and is guided to the sealing material.

According to a fifth aspect of the present invention, in the method of manufacturing a display device according to the fourth aspect, an installation position of the reflecting mirror and an ultraviolet ray reflected by the reflecting mirror are prevented from passing through the electrode pattern on the substrate. Set the angle.

According to a sixth aspect of the present invention, in the method of manufacturing a display device according to the second or third aspect, the first and second display devices are provided.
The thickness around one end face of the jig is made thinner than its center part, the substrate is fixed at the center part, and a reflecting mirror is installed around the end face thinner than the center part. The reflected ultraviolet light is guided through the substrate to the sealing material.

According to a seventh aspect of the present invention, in the method for manufacturing a display device according to the second or third aspect, the substrate and the first
And a buffer member smaller in size than the first and second jigs, respectively, between the substrate and the second jig.

According to an eighth aspect of the present invention, there is provided an apparatus for manufacturing a display device having two substrates adhered to each other via a sealing material, wherein the two substrates are arranged to face each other with the sealing material interposed therebetween. Pressing means for pressing the substrates together, and ultraviolet light irradiating means for irradiating the sealing material directly with ultraviolet light without passing through the substrate from outside the end face of the substrate in a state where the substrates are pressed by the pressing means, Is provided.

According to a ninth aspect of the present invention, in the apparatus for manufacturing a display device according to the eighth aspect, the pressing means fixes the first jig for fixing one of the substrates and the other of the substrates. A second jig, wherein the two substrates are arranged to face each other, and the first and second jigs press the substrates together.

According to a tenth aspect of the present invention, in the apparatus for manufacturing a display device according to the eighth or ninth aspect, the ultraviolet irradiation means is constituted by using a UV lamp that emits ultraviolet light.

According to an eleventh aspect of the present invention, in the apparatus for manufacturing a display device according to the eighth or ninth aspect, the ultraviolet irradiating means has a plurality of optical fibers arranged in at least one line, and each of the optical fibers irradiates ultraviolet light. I do.

According to a twelfth aspect of the present invention, in the display device manufacturing apparatus according to the eighth or ninth aspect, the ultraviolet irradiation means is constituted by using a UV light emitting diode which emits ultraviolet light.

The invention of claim 2 will be described with reference to FIG. 1, for example. The "first jig" corresponds to the upper surface plate 3, and the "second jig" corresponds to the lower surface plate 4, respectively. .

The invention of claim 3 will be described with reference to FIG. 3, for example. The "first jig" is provided on the upper surface plate 3a and the "second jig"
Jig "respectively corresponds to the lower platen 4a.

The invention of claim 4 will be described with reference to, for example, FIG. 4. "Reflection mirror" corresponds to the reflection mirror 5.

The invention according to claim 7 will be described with reference to, for example, FIG. 5. “Buffer member” corresponds to the buffer member 6.

The invention of claim 8 will be described with reference to, for example, FIG. 1. "Pressing means" corresponds to the upper surface plate 3 and the lower surface plate 4.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for manufacturing a display device to which the present invention is applied will be specifically described with reference to the drawings.

[First Embodiment] FIG. 1 is a diagram for explaining a manufacturing process of a liquid crystal display device according to a first embodiment.
First, as shown in FIG. 1A, a sealing material 2 made of an ultraviolet curable resin is applied to one transparent substrate 1a. Alternatively, the transparent substrate 1a to which the sealing material 2 has been applied in advance is transported to a stage (not shown). Note that an ultraviolet-curable resin that is cured by ultraviolet irradiation is used for the seal material 2.

FIG. 1A is a sectional view of the transparent substrate 1a, and FIG.
(B) shows top views, and as shown in these figures, the sealing material 2 is formed linearly along the periphery of the transparent substrate 1a.

Next, as shown in FIG. 1C, one transparent substrate 1a is fixed to the upper platen 3, and the other transparent substrate 1b is fixed to the lower platen 4. The upper platen 3 and the lower platen 4 preferably have a structure that can adsorb the transparent substrates 1a and 1b with air or the like so that the transparent substrates 1a and 1b do not move without permission. Alternatively, the transparent substrates 1a and 1b may be temporarily fixed with an adhesive or the like. Note that at least one of the upper surface plate 3 and the lower surface plate 4 is movable up, down, left, and right.
The transparent substrates 1a and 1b are aligned with each other with the a and 1b fixed to the upper surface plate 3 and the lower surface plate 4.

Next, as shown in FIG.
And the transparent substrates 1a and 1b fixed to the lower platen 4 are arranged to face each other with the sealing material 2 interposed therebetween.
Is held down by the upper surface plate 3 and the lower surface plate 4. If a mark for positioning is attached to one of the upper surface plate 3 and the lower surface plate 4, accurate positioning can be performed by moving the upper surface plate 3 or the lower surface plate 4 by a deviation from the mark position. .

Next, as shown in FIG. 1E, the sealing material 2 is cured by irradiating the sealing material 2 with ultraviolet rays. FIG.
FIG. 1F is a plan view of FIG. 1E viewed from a lateral direction. As shown in the figure, ultraviolet light is directly applied to the sealing material 2 from outside the end faces of the transparent substrates 1a and 1b without passing through the transparent substrates 1a and 1b.

Next, after injecting a liquid crystal composition between the transparent substrates 1a and 1b, a color filter and a polarizing plate are formed on the surfaces of the transparent substrates 1a and 1b to complete a liquid crystal display device.
As the liquid crystal composition to be injected, various liquid crystals such as cyclohexane, ester, biphenyl, and pyrimidine can be considered.

FIG. 2 is a schematic configuration diagram of a manufacturing apparatus of the liquid crystal display device of FIG. The manufacturing apparatus shown in FIG. 2 includes a surface plate control device 11 for controlling the position of the upper surface plate 3 and the lower surface plate 4, and an ultraviolet irradiation device 12 for irradiating ultraviolet light. When a liquid crystal display device is manufactured, a device for injecting liquid crystal and the like are required in addition to this, but they are omitted in FIG.

The platen controller 11 and the ultraviolet irradiation device 12 operate in conjunction with each other. The platen controller 11 controls the upper platen 3 and the lower platen 4 to apply pressure to the two transparent substrates 1a and 1b. While irradiating ultraviolet rays from the ultraviolet irradiating device 12.

The ultraviolet irradiation device 12 includes a UV (ultraviolet) lamp, a light source in which a plurality of optical fibers for irradiating ultraviolet light are arranged side by side, a UV (ultraviolet) light emitting diode, and the like. If an ultraviolet irradiation device is configured by arranging optical fibers and UV light emitting diodes side by side, ultraviolet light can be irradiated uniformly over a wide range, and the entire sealing material 2 can be uniformly and completely cured. Therefore, crystal contamination of the sealing material does not occur, and a quartz stage is not required, so that manufacturing cost can be reduced.

[Second Embodiment] In a second embodiment, the upper platen 3 and the lower platen 4 for fixing the transparent substrate are processed into a tapered shape so that the sealing member 2 is efficiently irradiated with ultraviolet rays. It was made.

FIG. 3 is a view showing a manufacturing process of the display device according to the second embodiment. As shown in the figure, the end surfaces of the upper surface plate 3a and the lower surface plate 4a are tapered obliquely, and the ultraviolet light obliquely incident on the substrate surfaces of the transparent substrates 3a, 4a receives the upper surface plate 3a and the lower surface plate. The sealing material 2 is directly irradiated without hitting the sealing material 4a. Therefore, compared to the first embodiment,
The restriction on the irradiation angle of the ultraviolet rays is relaxed, and the sealing material 2
Becomes easier to cure.

[Third Embodiment] In a third embodiment, at least one of the upper surface plate 3 and the lower surface plate 4 is provided with a reflecting mirror for reflecting ultraviolet rays.

FIG. 4 is a view showing a manufacturing process of the display device according to the third embodiment. As shown in the drawing, a step is provided in the upper stool 3b, and the vicinity of the end surface of the upper stool 3 is lower by one step. A reflecting mirror 5 is provided near the end surface of the upper surface plate 3,
Ultraviolet rays are irradiated from the ultraviolet irradiation device 12 toward the reflecting mirror 5. The ultraviolet light reflected by the reflecting mirror 5 passes through one transparent substrate 1a and is incident on the sealing material 2.

The ultraviolet light reflected by the reflecting mirror 5 is applied to the transparent substrate 1
When a sufficient amount of ultraviolet rays does not reach the sealing material 2 when the electrode pattern on a is hit, the position and angle of the reflecting mirror 5 are set so that the ultraviolet rays do not hit the electrode pattern.

If the reflecting mirror 5 as shown in FIG. 4 is provided, the ultraviolet light directly irradiating the sealing material 2 without passing through the transparent substrate 1a and the sealing material 2 once passing through the transparent substrate 1a are used.
The sealing material 2 can be efficiently cured by the ultraviolet rays irradiated to the sealing material 2.

[Fourth Embodiment] In the fourth embodiment, a buffer is interposed between the upper surface plate 3 and the transparent substrate 1a and between the lower surface plate 4 and the transparent substrate 1b. .

FIG. 5 is a view showing a manufacturing process of the display device of the fourth embodiment. As shown, one of the transparent substrates 1a
Is fixed to the upper surface plate 3 with the buffer material 6 interposed therebetween, and the other transparent substrate 1b is fixed to the lower surface plate 4 with the buffer material 6 interposed therebetween. Since the cushioning material 6 has a smaller cross-sectional area than the upper surface plate 3 and the lower surface plate 4, the ultraviolet light which is obliquely incident on the substrate surfaces of the transparent substrates 1 a and 1 b can be used. 4, the seal material 2 is directly irradiated. Therefore, the irradiation efficiency of ultraviolet rays can be improved as in the second embodiment.

Conventionally, if the thicknesses of the transparent substrates 1a and 1b, the upper platen 3 and the lower platen 4 vary, the sealing material 2
5 may be crushed or the gap between the transparent substrates 1a and 1b may be uneven.
By providing the cushioning material 6 as described above, the above-described variation can be offset, and the gap between the transparent substrates 1a and 1b can be made uniform.

In each of the above-described embodiments, an example has been described in which the transparent substrates 1a and 1b are pressed against each other using the upper platen 3 and the lower platen 4. However, the upper platen 3 and the lower platen 4 are not used and air is used. While pressing the transparent substrates 1a and 1b, the sealing material 2 may be cured by irradiating the sealing material 2 with ultraviolet light from the lateral direction.

In each of the embodiments described above, an example in which the two transparent substrates 1a and 1b constituting the liquid crystal display device are bonded is described. However, the present invention relates to a display device other than the liquid crystal display device (for example, a plasma display device). Can be widely applied.

[0045]

As described in detail above, according to the present invention, when two substrates are bonded together via a sealing material, the sealing material is directly passed from outside the end faces of these substrates without passing the substrates. Since the ultraviolet rays are irradiated on the sealing material, the sealing material can be completely cured. Therefore, troubles such as crystal contamination of the sealing material due to uncured sealing material do not occur, and the two substrates can be stably and firmly bonded.

When irradiating the sealing member with ultraviolet rays while pressing the substrate with the first and second jigs,
The sealing material is efficiently irradiated with ultraviolet rays by processing the first and second jigs into a tapered shape, for example, or by interposing a buffer between the first and second jigs and the substrate. can do. In addition, if a reflecting mirror is installed so that ultraviolet rays do not hit the electrode pattern on the substrate, and the ultraviolet rays reflected by the reflecting mirror are guided to the sealing material after passing through the substrate, the sealing material can be completely Can be cured.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a manufacturing process of a liquid crystal display device according to a first embodiment.

FIG. 2 is a schematic configuration diagram of a manufacturing apparatus of the liquid crystal display device of FIG.

FIG. 3 is a diagram illustrating a manufacturing process of the display device according to the second embodiment.

FIG. 4 is a diagram illustrating a manufacturing process of the display device according to the third embodiment.

FIG. 5 is a view showing a manufacturing process of the display device of the fourth embodiment.

FIG. 6 is a view for explaining a conventional irradiation direction of ultraviolet rays.

[Explanation of symbols]

 1a, 1b Transparent substrate 2 Sealing material 3 Upper surface plate 4 Lower surface plate 5 Reflector 6 Buffer material 11 Surface plate controller 12 Ultraviolet irradiation device

Claims (12)

[Claims] 1. A method of manufacturing a display device having two substrates adhered to each other via a sealing material, wherein the sealing material is formed of a material which is cured by ultraviolet rays, and the sealing material is formed on at least one of the substrates. Attaching the two substrates to each other with the sealing material interposed therebetween, and irradiating the sealing material with ultraviolet rays directly from outside the end surface of the substrate without passing through the substrate to cure the sealing material. A method for manufacturing a display device, comprising: 2. One of the substrates is fixed to a first jig, and the other of the substrates is fixed to a second jig, and the two substrates are opposed to each other with the sealing material interposed therebetween. 2. The method according to claim 1, wherein the sealing member is irradiated with ultraviolet light while the substrates are pressed against each other by first and second jigs. 3. 3. The first and second treatments so that ultraviolet light obliquely incident on the substrate surface of the opposed substrate is irradiated directly on the sealing material without passing through the substrate. The method for manufacturing a display device according to claim 2, wherein the tool is processed into a tapered shape. 4. A method for manufacturing a display device having two substrates adhered to each other via a sealing material, wherein the sealing material is formed of a resin which is cured by ultraviolet rays, and the two substrates are sandwiched by the sealing material. A display, wherein a reflecting mirror is arranged on the outer surface side of at least one of the substrates, and the ultraviolet light reflected by the reflecting mirror passes through the substrate and is guided to the sealing material. Device manufacturing method. 5. The display device according to claim 4, wherein the setting position and the angle of the reflecting mirror are set so that the ultraviolet light reflected by the reflecting mirror does not pass through the electrode pattern on the substrate. Production method. 6. The thickness of the periphery of one end of the first and second jigs is made thinner than the center thereof, the substrate is fixed at the center, and the periphery of the end is thinner than the center. The method according to claim 2, wherein a reflecting mirror is provided, and the ultraviolet light reflected by the reflecting mirror is guided through the substrate to the sealing material. 7. The first jig between the substrate and the first jig and between the substrate and the second jig, respectively.
4. The method according to claim 2, wherein a buffer member smaller in size than the second jig is interposed. 8. A manufacturing apparatus for a display device having two substrates adhered to each other via a sealing material, wherein the two substrates are arranged to face each other with the sealing material interposed therebetween, and the substrates are pressed against each other. Pressure means, in a state where the substrates are pressed against each other by the pressure means,
An apparatus for manufacturing a display device, comprising: an ultraviolet irradiation unit configured to directly irradiate ultraviolet rays to the sealing material without passing through the substrate from outside the end surface of the substrate. 9. The pressurizing means includes a first jig for fixing one of the substrates, and a second jig for fixing the other of the substrates, wherein the two substrates are arranged to face each other. , The first and second
The apparatus for manufacturing a display device according to claim 8, wherein the substrates are pressed against each other by the jig. 10. The apparatus for manufacturing a display device according to claim 8, wherein said ultraviolet irradiation means is constituted by using a UV lamp which emits ultraviolet light. 11. The display device manufacturing apparatus according to claim 8, wherein said ultraviolet irradiation means has a plurality of optical fibers arranged in at least one line, and each of said optical fibers emits ultraviolet light. 12. The display device manufacturing apparatus according to claim 8, wherein said ultraviolet irradiation means is constituted by using a UV light emitting diode which emits ultraviolet light.