JPH08262457A - Apparatus for producing liquid crystal display device - Google Patents

Abstract

PURPOSE: To provide an apparatus for producing a liquid crystal display device by making it possible to apply uniform press bonding force on substrates at the time of sealing and press bonding these substrates and to execute sealing and press bonding in a short period of time. CONSTITUTION: A sealing material 8 of a UV curing type is adhered to the transparent substrate 2 formed with transparent electrodes 4 and the spacers 9 are disposed on another transparent substrate 3 formed with transparent electrodes 5. A pair of the transparent substrates 2, 3 are combined and are placed on a glass surface plate which has a suction port at its end side part and allows the transmission of UV rays. The substrates are then irradiated with UV rays from the light source side of the surface plate side. A film for press bonding is placed on the surface plate and is irradiated with the UV rays to cure the sealing material 8. A pair of the transparent substrates 2, 3 are uniformly pressed and sealed while this film for press bonding is sucked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a liquid crystal display for pressing a seal.

[0002]

2. Description of the Related Art Generally, in a liquid crystal display, a sealing material is applied to one of a pair of transparent substrates on which a transparent electrode is formed by printing or the like, and the pair of transparent substrates are overlapped with a spacer interposed therebetween. After the transparent substrate thus formed is pressure-sealed and a liquid crystal material is injected between the pair of transparent substrates, a polarizing plate is arranged outside the transparent substrate.

In general, an epoxy resin-based thermosetting type is used as a sealing material. Generally, in order to maintain a uniform gap between a pair of transparent substrates, the size of a liquid crystal display is reduced. The sealing material is heated and hardened while being pressed with a pressing force corresponding to the pressure. Furthermore, the time required for curing the sealing material is within one hour. However, since the productivity is poor with pressure bonding by one piece, a plurality of pieces are stacked together and sandwiched with a platen having an appropriate weight. And pressurize.

However, in such an apparatus, it takes time for the temperature required for curing to be transmitted to all of the stacked liquid crystal displays, and the sealing and crimping time is several hours. In addition, with such a stack, it is difficult to apply a uniform desired pressing force to each liquid crystal display, and depending on the stacking positions of the liquid crystal displays, a uniform gap does not appear or distortion occurs in the seal shape. Often do. In recent years, not only glass but also a transparent substrate made of a plastic film has been used in recent years.
Since the transparent substrate itself made of a film is not as flat as glass and has flexibility, a uniform pressing force is not applied to the entire transparent substrate. Furthermore, when a thermosetting sealant is used, it is difficult to apply a more uniform pressure force due to dimensional changes such as shrinkage during pressure bonding.

From the above, the device described in, for example, Japanese Patent Application Laid-Open No. 61-145586 is conventionally known. The device described in Japanese Patent Laid-Open No. 61-145586 is a device in which a combination of a pair of transparent substrates is inserted into a bag of a plastic sheet material, and the inside of the bag is depressurized for pressure sealing. .

However, the semi-finished product in which a pair of glass substrates are combined with each other through a sealing material is in a state where the sealing material is still uncured unless the stationary state is maintained, so that the semi-finished product is apt to be displaced and is simply packed in a bag. In the device, even if a pair of transparent substrates is combined with high precision, there is a very high possibility of misalignment.
In this case, a temporary fixing means may be considered, but the number of steps is increased and the production efficiency is not good. Furthermore, it is necessary to devise a device so that it does not move after being put in the bag, but it is difficult to fix the bag because it is a plastic film.

As an apparatus for pressure-sealing such a transparent substrate using a plastic film having the same plasticity as that of a bag, instead of a material such as glass, for example, a device described in JP-A-57-188018 is disclosed. Devices are known. In JP-A-57-188018, a transparent rubber substrate is sealed in a container made of silicon rubber and a stainless steel plate while being suctioned, and is sealed by pressing.

[0008]

However, the apparatus described in Japanese Patent Application Laid-Open No. 57-188018 has a problem that it is difficult to apply a uniform pressing force, and the gap may not be maintained uniformly. I have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a liquid crystal display capable of constantly applying a uniform pressing force to a liquid crystal display during seal pressing and maintaining a very uniform gap. It is an object of the present invention to provide an apparatus for manufacturing a liquid crystal display, which is capable of performing sealing and pressure bonding in a short time.

[0010]

A liquid crystal display manufacturing apparatus according to the present invention comprises a seal adhering means for adhering a sealant to at least one of a pair of transparent substrates on which a desired transparent electrode is formed, and a desired transparent electrode. Spacer arranging means for arranging a spacer on at least the other of the pair of formed transparent substrates, assembling means for combining the pair of transparent substrates on which the sealing material is attached and on which the spacers are arranged, and an edge portion And a pressure bonding apparatus for pressure-sealing the pair of transparent substrates while sucking the pressure-bonding film while covering the pressure-bonding film on the surface plate to cure the sealing material. It is equipped with a sealing material on at least one of the pair of transparent substrates, and a spacer is arranged on the other of the pair of transparent substrates, and then the combination is placed on a surface plate to cover the pressure bonding film. Add a uniform crimping force to assemble the product by suction by the suction port provided on the end side portion opposite the platen.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid crystal display manufacturing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a liquid crystal display device 1. In manufacturing the liquid crystal display device 1, transparent electrodes 4, 5 having a desired pattern are formed on the inner surfaces of a pair of transparent substrates 2, 3 made of transparent glass plates.
And the alignment film 6, such as polyimide resin, is formed.
Apply 7. Then, a sealing material 8 of an ultraviolet-curable adhesive such as acrylic or epoxy is applied to the inner surface of the edge of at least one transparent substrate 2 by screen printing or the like, and a spacer 9 is disposed on the other transparent substrate 3. I do. Then, the pair of transparent substrates 2 and 3 are overlapped via the spacer 9.

The semi-finished product 1a thus obtained is shown in FIG.
The crimping device 11 is installed. In the crimping device 11, a surface plate 13 is disposed above a machine frame 12, and the surface plate 13 is formed of a material that sufficiently transmits ultraviolet rays, for example, glass. The internal precision of about 50 to 100 μm is sufficient. Further, at least two or more suction ports 14 connected to a vacuum suction device are provided at the front end of the surface plate 13, and a positioning piece 15 is provided at the upper surface.

Further, a plastic crimping film 16 is wound around the front of the machine frame 12 in a roll shape, and
A locking tool 17 is provided at the rear of the machine frame 12. Also, machine frame
A light source 18 such as a high-pressure mercury lamp as a sealing material curing unit and an ultraviolet irradiation unit is provided in a lower part of the inside 12, and a cover 19 is provided on an upper part of the machine frame 12 so as to be openable and closable. And
The pressure-bonding film 16 is preferably thinner than thick, but considering strength, easiness of handling, etc., a thickness of about 0.1 mm is suitable, and the material is a plastic film such as polyethylene terephthalate.
Polyethersulfone, Teflon film and the like are preferred.

Then, the semi-finished product 1a is placed on the surface plate 13, and the front end is abutted against the positioning piece 15 for positioning and installation. Then, the crimping film 16 wound forward is pulled out to the front, and as shown in FIG. 3, almost the entire surface of the platen 13 is covered.
Hold by 17.

Then, vacuum suction is performed from the suction port 14 provided along the front end side of the surface plate 13, and the pressure-bonding film 16 is brought into close contact with the semi-finished product 1a as shown in FIG. A uniform crimping force is applied to this semi-finished product 1a. At the same time, the semi-finished product 1a is irradiated with ultraviolet rays by the light source 18 to cure the sealing material 8.

Then, liquid crystal is sealed between the pair of transparent substrates 2 and 3 to complete the liquid crystal display 1.

Regarding the degree of negative pressure due to suction, the pressure force varies depending on the size of the liquid crystal display 1, so that the degree of vacuum may be selected according to this.

According to the experiment, the suction port 14 is connected to the platen 13
If it is provided along one side of the take-up film 16 on the winding side, it is sufficient to perform uniform pressure bonding, but by providing it on the opposite side, it is possible to more securely adhere.

The liquid crystal display manufactured in this manner has a very small lot-to-lot variation, and a liquid crystal display having a uniform gap between the pair of transparent substrates 2 and 3 can be obtained.

FIG. 5 shows a case where a plastic film is used as a pair of transparent substrates of a liquid crystal display.

As a pair of transparent plastic films 2a and 3a to be a pair of transparent substrates 2 and 3, an organic film such as polyethersulfone or polyethylene terephthalate is used. The transparent electrodes 4 and 5 and the alignment films 6 and 7 having a desired pattern are formed on the opposing surfaces, and the pair of films 2a and 3a are pulled out from the roll body and sent through the guide rollers 21 and 22 of the transfer device. Then, an ultraviolet-curable sealing material 8 is applied to one film 2a by a screen printing machine 23 as a sticker attaching means, while the other film 3a is applied.
The spacer 9 is sprayed by a spray device 24 as a spacer disposing means. Subsequently, a pair of films 2a,
3a is assembled with high accuracy by a lead hole or the like by an assembling device 25 as assembling means and guided to the crimping device 11.

In this crimping device 11, slit-shaped suction ports 14 are formed along both sides of the surface plate 13, and both sides of the film 16 for crimping are inserted into the suction ports 14 on both sides. Above the crimping film 16, a support 26 such as vacuum tweezers is arranged.

When the pair of films 2a and 3a combined as described above are positioned on the surface plate 13, the crimping film 16 held by the support tool 26 separates and is pulled downward by suction from the suction port 14. Then, the pressure-bonding film 16 is brought into close contact with the films 2a and 3a, uniform pressure bonding is performed, and the sealing material is cured by ultraviolet rays when the light source 18 is turned on when pressure is applied until a sufficient gap appears, Sealing is completed.

By performing the sealing process as described above,
Sealing is completed in a short time, and a liquid crystal display having a high-precision gap can be obtained by applying uniform pressure bonding without hindering the index as a continuous processing step.

After the completion of the pressure bonding, the support 26 descends on the pressure bonding film 16 brought into close contact with the films 2a and 3a, and pulls the pressure bonding film 16 upward.

When the transparent substrates 2 and 3 are formed of the plastic films 2a and 3a as described above, even if the transparent substrates 2 and 3 are sandwiched between rigid bodies such as glass or the like and pressure-bonded, a uniform force is applied to the entire surface by the warp of the glass or the like. It is difficult to add, and since the films 2a and 3a themselves are also plastic, the nature of the rigid body to be clamped is particularly easy to appear, and the distribution to which the force is applied is poor,
Although it is extremely difficult to apply a uniform pressing force, uniform pressurization is easily performed by using the pressure-bonding film 16, and therefore, the films 2a,
This is particularly effective when using 3a.

In each of the above embodiments, the case where the ultraviolet ray is irradiated from the lower side is shown, but the ultraviolet ray may be irradiated from the upper side. In this case, the pressure-bonding film 16 is a Teflon film or the like having a good ultraviolet transmittance. It is preferable to use.

In particular, in the case where a plastic film is used for the transparent substrate, it is possible to suppress the variation in the compression force due to dimensional changes such as shrinkage during thermal compression.

An ultraviolet-curable sealant is used as the sealing material, and polyether sulfone (PE) is used as the transparent substrate.
S) and polyethylene terephthalate (PET) are very effective when using an organic film, but when a thermosetting type sealing material is used and a transparent substrate such as glass is used as a transparent substrate. However, a uniform pressing force and uniform heating are possible, and similar effects can be expected.

[0031]

According to the liquid crystal display manufacturing apparatus of the present invention, a sealing material is attached to at least one of a pair of transparent substrates, combined with a spacer and then placed on a surface plate for pressure bonding. By covering the film and sucking the film with the suction ports provided at the opposite side edges of the surface plate for pressure sealing, it is possible to apply a uniform pressure force to the whole and seal in a short time. Therefore, it is possible to easily obtain a liquid crystal display having a highly accurate and uniform gap.

[Brief description of drawings]

FIG. 1 is a sectional view showing a liquid crystal display according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing one step of the above.

FIG. 3 is an explanatory view showing a step subsequent to the step shown in FIG. 2;

FIG. 4 is an explanatory diagram showing a step subsequent to the step shown in FIG. 3 above.

FIG. 5 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Liquid crystal display 2,3 Transparent substrate 4,5 Transparent electrode 8 Sealing material 9 Spacer 11 Crimping device 13 Surface plate 14 Suction port 16 Crimping film 18 Light source as sealing material hardening means and ultraviolet irradiation means 23 Sealing means Screen printing machine 24 Spray device as spacer arrangement means 25 Assembly device as assembly means

Claims (3)

[Claims] 1. A seal adhering means for adhering a sealing material to at least one of a pair of transparent substrates on which desired transparent electrodes are formed, and a spacer on at least the other of the pair of transparent substrates on which desired transparent electrodes are formed. Spacer arranging means, assembling means for assembling a pair of transparent substrates to which the sealing material is attached and spacers are arranged, surface plate having a suction port at the edge and curing of the sealing material A pressure-bonding device that covers the pressure-bonding film on the surface plate, cures the sealing material by the sealing-material curing means, and pressurizes and seals the pair of transparent substrates while sucking the pressure-bonding film. An apparatus for manufacturing a liquid crystal display, comprising: 2. The sealing material curing means is an ultraviolet irradiation means for irradiating ultraviolet rays. The sealing material is an ultraviolet curing type, and the ultraviolet irradiation means irradiates ultraviolet rays to cure the ultraviolet curing type sealing material. The liquid crystal display manufacturing apparatus according to claim 1, wherein: 3. The liquid crystal display manufacturing apparatus according to claim 1, wherein the pair of transparent substrates are organic films.