JPS6045405B2 - How to seal the LCD panel - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for sealing a liquid crystal panel.

The conventional method for sealing LCD panels involves vapor-depositing Teflon on the panel glass to form an alignment film, then performing a rubbing process to align the liquid crystal, and then printing a sealant on the joints of one panel glass. The one panel glass and the other panel glass were bonded together by thermocompression using a sealant, and the two panel glasses were bonded together using a sealant.

However, with this method, Teflon adheres to the joints of the panel glass, making it difficult to apply the sealant. Conventionally, Teflon adhering to the joints was wiped off with an organic solvent such as acetone or trichlene. It was on. Therefore, the work was extremely difficult and complicated, making it unsuitable for mass production. In addition, after the rubbing process, a sealant is applied, so
In the case of printing, the mesh pattern of the screen plate was transferred onto the display surface of the panel, which had the disadvantage of impairing the appearance. Furthermore, it is common to form a sealant into a paste, but in this case, when two panel glasses are bonded together by heat and pressure,
The viscosity of the sealant became very low, and as a result, there was a risk that it would seep into the space between the stacked panel glasses, resulting in poor appearance. The present invention solves the above-mentioned drawbacks. It simplifies the work, increases work efficiency, and creates a liquid crystal display in which the mesh pattern of the screen plate is not transferred and does not cause any problems in appearance even when a sealant is printed and applied. The purpose is to provide a panel sealing method.

Embodiments of the present invention will be described below based on the drawings.

A masking material 2 is attached to the bonding portion 1a of the lower panel glass 1 (the portion bonded to the upper panel glass via a cylinol agent, which will be described later), and so-called masking is performed (FIG. 1).

Teflon 3 is vapor deposited on the surface of the lower panel glass 1 to which this mask material 2 is attached to form an alignment film 4, and after the vapor deposition is completed, the mask material 2 is peeled off. Thus, an alignment film 4 made of Teflon 3 is formed on the lower panel glass 1 except for the joint portion 1a (FIG. 2). Incidentally, an alignment film 4'' of Teflon 3 is similarly formed on the upper panel glass 6. If Teflon 3 is vapor-deposited with masking in this manner, Teflon 3 will not adhere to the joint portion 1a, which will be described later. It becomes easier to apply the sealant.

Next, a sealant 5 is applied to the joint portion 1a of the lower panel glass 1 by printing or the like (FIG. 3). An adhesive paste is used as this sealant 5. Since the adhesive paste contains alumina particles (maximum diameter: 10 to 12 μm), the sealant 5 can be formed and maintained at a constant height. After applying the sealant 5, a primary curing treatment is performed to semi-cure the sealant 5.

This primary curing treatment is carried out by heating at a temperature of 80 to 1005C for 10 to 1 hour. Since this treatment temperature is lower than the curing temperature of the sealant 5, the sealant 5 is not completely cured, but is in a semi-cured state, retains a certain shape, and has adhesive strength. Next, a wrapping process for liquid crystal alignment is performed.

That is, the lower panel glass 1 having the alignment film sealant 5
Rub the surface in a certain direction using gauze, cloth, etc. to give orientation. In this case, since the sealant 5 is in a semi-hardened state, there is no risk of it sagging or crumbling during wrapping. The upper panel glass 6 is similarly wrapped and treated. After the wrapping process is completed, the upper panel glass 6 is overlapped and pressed onto the lower panel glass 1, and the main thermocompression bonding process is performed (FIGS. 4 and 5).

This thermocompression bonding process is performed by heating at a temperature of 150 to 200'C for about 1 hour. Let's go. Through this main thermocompression bonding process, the sealant 5 is completely cured, and the lower panel glass 1 and the upper panel glass 6 are joined and integrated via the sealant 5. During this main thermocompression bonding process, since the sealant 5 is thermocompression bonded in a semi-hardened state, there is no risk that the sealant 5 will seep into the space between the panel glasses 1 and 6. As described above, in the present invention, the wrapping process is performed after the sealant is applied by printing or the like, so even when the sealant is applied by printing, the mesh pattern of the screen plate is not transferred, and therefore the panel display is not displayed as before. Since the mesh pattern does not appear on the surface, it does not cause any problem in appearance.

In addition, since the main thermocompression bonding process is performed after the sealant has been semi-hardened through the primary curing process, there is no risk of the sealant seeping into the interior between the panel glasses, unlike in the past, and there is no risk of poor appearance. Does not cause any problems. Furthermore, by masking during Teflon vapor deposition as in the above embodiment, it is possible to prevent Teflon from adhering to the joints of the panel glass. This eliminates the need for the difficult work of wiping off Teflon, significantly simplifies the work, increases work efficiency, and makes it suitable for mass production.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a perspective view of a lower panel glass with a mask material attached; FIG. 2 is a longitudinal sectional view of a lower panel glass with a Teflon alignment film formed thereon; Figure 3 is a vertical cross-sectional view of the lower panel glass with a sealant applied to the joint, Figure 4 is a vertical cross-sectional view of the upper panel glass and the lower panel glass before they are bonded by thermocompression, and Figure 5 is the upper panel glass. This is a vertical cross-sectional view of the lower panel glass after it has been thermocompression bonded. 1... lower panel glass, 1a... joint, 2... mask material, 3... Teflon, 5...
...Sealant, 6...Top panel glass.

Claims (1)

[Claims] 1. After attaching Teflon to the inner surface of one panel glass so that it does not adhere to the joint, a sealant made of thermosetting resin is applied to the joint, and then a primary curing treatment is performed to remove the sealant. After that, a rubbing treatment is performed to align the liquid crystal, and then the other panel glass, which has been subjected to a rubbing treatment separately, is overlaid and pressure-bonded to the one panel glass, and a main thermocompression bonding treatment is performed. A method for sealing a liquid crystal panel, characterized in that the sealant is completely cured, and one panel glass and the other panel glass are joined and integrated via the sealant.