JPH055878A - Method and device for sticking polarizing plate - Google Patents

Abstract

PURPOSE:To simplify stages by executing the operations for removing waving and defoaming in sticking operations within the same chamber. CONSTITUTION:A polarizing plate 2 with glue tentatively suck to the home position of a liquid crystal panel 1 and the liquid crystal panel 1 are supplied and set on a work table 3. Evacuation to a vacuum is then executed by a vacuum pump 8 until a specified vacuum degree is attained and the front surface of the polarizing plate 2 is then pressurized by a pressurizing roll 4. The roll is moved along the front surface, by which the polarizing plate 2 is stuck to the liquid crystal 1. The inside of the chamber 6 is maintained in a high-temp. and high-pressure state by a high-temp. and high-pressure gas supplying unit 9 and the gas is leaked after resting for a specified period of time to restore the atm. pressure, by which the sticking of the liquid crystal panel 1 and the polarizing plate 2 is ended. The waving and warpage of the polarizing plate 2 are corrected by the pressurizing roll 4 in the vacuum chamber in this way and the air existing in the tacky adhesive layer is dissipated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sticking a polarizing plate in the manufacture of an electro-optical element using liquid crystal used for image display, computer terminals, optical shutters and the like.

[0002]

2. Description of the Related Art Electro-optical elements using liquid crystal panels are
A polarizing plate coated with a sizing material having polarization characteristics is generally attached to both outer surfaces of the liquid crystal panel. Next, a method for attaching a polarizing plate to a conventional liquid crystal panel will be described. Figure 2,
FIG. 3 is a cross-sectional view showing a method of attaching a polarizing plate and an attaching device in the atmosphere.

In FIG. 2, 3 is a work table on which a liquid crystal panel before the polarizing plate is attached is set, 4 is a pressure roll for correcting the adhesive surface of the polarizing plate, and 1 is a liquid crystal panel before the polarizing plate is attached. And 2 is a polarizing plate attached to the liquid crystal panel. In the pasting operation, the pressure roll 4 is fixed, and the work table 3, the liquid crystal panel 1, and the polarizing plate 2 temporarily placed at a fixed position of the liquid crystal panel are passed under the pressure roll 4 to polarize the liquid crystal panel 1. The boards 2 are attached together. The problem with this sticking method is that dust easily sticks between the liquid crystal panel 1 and the polarizing plate 2, and that the adhesive layer of the polarizing plate 2 contains a large amount of air, causing air pockets and causing a poor appearance. Is to be.

Next, FIG. 3 will be described. FIG. 3 has the same configuration as FIG. For the sticking operation, the work table 3 is fixed, the liquid crystal panel 1 is fixed on the work table 3, the polarizing plate 2 is temporarily placed at a fixed position of the liquid crystal panel 1, and the pressure roll 4 is passed over it. The polarizing plate 2 is attached to the liquid crystal panel 1. The problem with this sticking method is the same as that of FIG.

FIG. 4 is a cross-sectional view showing a conventionally known method and apparatus for attaching a polarizing plate in a vacuum chamber. Figure 4
In FIG. 6, 6 and 7 are vertically divided vacuum chambers, 8 is a vacuum pump for maintaining a constant degree of vacuum in the chamber, 3 is a work table for setting a liquid crystal panel before attaching a polarizing plate, and 5 Is a press head for pressing the polarizing plate, 1 is a liquid crystal panel before the polarizing plate is attached, and 2 is a polarizing plate attached to the liquid crystal panel.

For the sticking operation, the liquid crystal panel 1 is set on the work table 3, the polarizing plate 2 coated with the adhesive material is set on the press head 5, the chambers 6 and 7 are closed, and the chamber 6 is set by the vacuum pump 8. The inside of 7 is evacuated to a certain degree of vacuum. Once a certain degree of vacuum is reached,
By pressing the press head 5 with the polarizing plate 2 set on the upper surface of the liquid crystal panel 1, the liquid crystal panel 1
The adhesive surface of the polarizing plate 2 is adhered to the liquid crystal panel 1, and then the inside of the chambers 6 and 7 is returned to the atmospheric pressure.
And the polarizing plate 2 are stuck together.

The problem with this attaching method is that the polarizing plate 2
In order to reduce the presence of air in the adhesive layer as much as possible, if the degree of vacuum is raised too much, the adhesive layer will dry and the adhesive force between the liquid crystal panel 1 and the polarizing plate 2 will decrease. However, the existing air remains, and air pools are generated, often resulting in poor appearance.

[0008]

In the above-mentioned method for sticking a polarizing plate, the straightening of the polarizing plate and the flattening of the polarizing plate adhesive layer must be carried out in separate works, which causes problems in the working process. Was becoming. Therefore, an object of the present invention is to provide a polarizing plate laminating method and a manufacturing device capable of correcting unevenness of a polarizing plate and leveling a polarizing plate adhesive layer in the same step and in the same device.

[0009]

In order to solve the above problems, the present invention relates to a method for attaching a polarizing plate to a liquid crystal panel, wherein a straightening pressure roll is added in the vacuum chamber, and high temperature and high pressure are applied in the same chamber. Add a gas filling function,
It was made possible to correct the adhesive surface of the polarizing plate and level the adhesive layer of the polarizing plate with the same device.

[0010]

In the method of attaching a polarizing plate having the above-mentioned function, the swell and warp of the polarizing plate can be corrected by a pressure roll in a vacuum chamber, and the air present in the adhesive layer can be diffused.

[0011]

The present invention will be described in detail below with reference to examples. FIG. 1 is a cross-sectional view showing a method for pasting a polarizing plate with a paste material in a vacuum chamber according to the present invention and a pasting device using the same. In FIG. 1, 1 is a liquid crystal panel before sticking a polarizing plate, 2 is a polarizing plate prepared for sticking, 3 is a work table for fixing and fixing the liquid crystal panel, and 4 is a pressure roll tracing the polarizing plate. 6 is a vacuum chamber for the upper surface, 8 is a vacuum pump for maintaining a constant degree of vacuum in the chamber, and 9 is a high-temperature high-pressure gas supply unit for supplying high-temperature high-pressure gas after bonding.

The sticking operation is performed by supplying and setting the polarizing plate 2 with the adhesive material temporarily attached to the work table 3 at a fixed position on the liquid crystal panel 1 and the liquid crystal panel 1, and the chamber 6 for the upper surface.
Is pressed against the upper surface of the liquid crystal panel 1, a vacuum is drawn by the vacuum pump 8 until a certain degree of vacuum is reached, and then the upper surface of the polarizing plate 2 is pressed by the pressing roll 4 and moved while tracing, thereby The polarizing plate 2 is attached to the panel 1, and thereafter, the inside of the chamber 6 is maintained at a high temperature and high pressure state by the high temperature and high pressure gas supply unit 9, left for a certain period of time, then leaked, and then returned to the atmospheric pressure by the liquid crystal panel 1. A sticking method and a sticking apparatus using the sticking method for ending the sticking step of the sheet and the polarizing plate 2.

As a result of adopting the method for sticking the polarizing plate of the present embodiment, the swelling of the polarizing plate can be corrected even at a low vacuum degree, and the defective appearance due to the air present in the polarizing plate adhesive layer is eliminated. In the above embodiment, the high temperature and high pressure gas was introduced to level the polarizing plate, but without introducing the high temperature and high pressure gas, a heater was installed inside the pressure roll 4 in the chamber and the roll 4 was kept at a high temperature in advance. Then, the same effect can be obtained even if the polarizing plate is attached to the liquid crystal panel while being heated.

[0014]

As described above, according to the present invention, since the polarizing plate is adhered in the vacuum chamber, the conventional problem that the polarizing plate is swelled can be solved. Further, since the pressure roll makes it possible to naturally degas bubbles existing in the adhesive between the panel and the polarizing plate or trapped bubbles, the defoaming work becomes unnecessary. In this way, the swelling on the sticking work and the defoaming work can be performed in the same chamber, so that the process can be simplified.

As a result, due to the manufacturing capability, it is possible to work in the same process and the same equipment, leading to a reduction in lead time, and an abandonment processing system can be adopted, which is useful for reducing the liquid inventory as compared with batch processing. Etc., it has great effects such as improvement in productivity and improvement in yield.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a polarizing plate sticking method of the present invention and a sticking apparatus using the same.

FIG. 2 is an explanatory view of a conventional method of attaching a polarizing plate in the atmosphere.

FIG. 3 is an explanatory view of a conventional method of attaching a polarizing plate in the atmosphere.

FIG. 4 is an explanatory diagram of a conventional method of attaching a polarizing plate in a vacuum.

[Explanation of symbols]

 1 Liquid Crystal Panel 2 Polarizing Plate 3 Work Table 4 Pressurizing Roll 5 Press Head 6 Chamber 7 Chamber 8 Vacuum Pump 9 High Temperature and High Pressure Supply Unit

Claims (1)

Claim: What is claimed is: 1. A pressure roll in a vacuum chamber is rotated and moved in a step of attaching a polarizing plate to a liquid crystal panel attached so that two electrode surfaces face each other. Then, the adhesive surface of the polarizing plate is pressure-bonded, and the polarizing plate surface is leveled. 2. A polarizing plate attaching device for attaching a polarizing plate to a liquid crystal panel, which comprises a vacuum chamber, a work table provided in the vacuum chamber, and a pressure roll, and exhausts through a pipe connected to the chamber. Alternatively, a polarizing plate attaching device characterized by supplying gas.