KR19980085927A - Manufacturing method of liquid crystal display device - Google Patents

Abstract

The present invention relates to a method for manufacturing an LCD, wherein a liquid crystal is injected after a sealing step of joining upper and lower liquid crystal substrates, and a liquid crystal display device is manufactured by embedding and sealing a liquid crystal inlet. It is a technology that can improve the characteristics and reliability of the device because it is possible to maintain a constant cell gap between the liquid crystal inlet and the other part in the process of filling with the encapsulated material and curing it.

Description

Manufacturing method of liquid crystal display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display (hereinafter referred to as an LCD). In particular, a liquid crystal is injected into a liquid crystal injection hole formed at one side of a seal pattern for sealing an upper and a lower liquid crystal substrate. It relates to a sealing material for embedding the liquid crystal inlet.

LCD, which is a kind of flat panel display device, changes the optical anisotropy by applying an electric field to liquid crystal, which combines the liquidity of liquid and the optical characteristics of crystal.It has lower power consumption than conventional cathode ray tube. It is widely used because it is easy to make small and light, small and large, and high in size.

In general, an LCD panel is configured in such a way that upper and lower liquid crystal substrates having transparent electrode patterns are adhered to each other by a failure turn formed with a liquid crystal inlet, and the liquid crystal is sealed in a cell gap that is a space therebetween.

1A to 1C are plan views and cross-sectional views illustrating a manufacturing method of an LCD according to the prior art, and FIG. 1B is a cross-sectional view illustrating a cut along ⓐ-ⓐ of FIG. 1A.

First, a transparent electrode pattern (not shown) and an alignment layer (not shown) for aligning a liquid crystal in a predetermined direction are formed on the liquid crystal substrate 11 of a transparent material, and a liquid crystal injection hole is formed outside the display area of the substrate 11. A failure turn 13 having 23 is formed. (FIGS. 1A and 1B).

After the other liquid crystal substrate 13 is sprinkled on the substrate 11 on which the failure turn 13 is formed, the failure turn 13 is cured by a UV curing lamp under a constant pressure applied to maintain the cell gap. The bonding is completed, and the liquid crystal is injected into the cell gap.

Then, the liquid crystal inlet 23 is embedded with an encapsulant 21, and the encapsulant is cured with a UV curing lamp while depressurizing the encapsulant to seal the liquid crystal 19.

At this time, the encapsulant 21 is formed of a material such as polyimide, which is fluid in a liquid state, and causes a volume shrinkage of about 5 to 10 percent with the encapsulant 21 during the curing process and is slightly sucked into the cell and cured. (FIG. 1C)

As described above, the LCD manufacturing method according to the related art has a problem that volume shrinkage occurs during the curing process, making it difficult to maintain a constant cell gap of the LCD, thereby degrading the characteristics and reliability of the device.

The present invention, in order to solve the above problems, by injecting a spacer into the encapsulant to minimize the phenomenon that the cell gap during the curing process by minimizing the cell gap of the device to maintain a constant cell gap of the device to improve the characteristics and reliability of the manufacturing of LCD The purpose is to provide a method.

1A to 1C are plan views and cross-sectional views illustrating a method of manufacturing a liquid crystal display device according to the prior art.

2 is a cross-sectional view illustrating a method of manufacturing an encapsulant of a liquid crystal display according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

11, 17: liquid crystal substrate 13: failure turn

15: liquid crystal inlet 19: liquid crystal

21: encapsulant 100: spacer

LCD manufacturing method according to the present invention for achieving the above object;

In the manufacturing method of the liquid crystal display device which injects a liquid crystal after sealing process which bonds an upper and a lower liquid crystal substrate, and fills and seals a liquid crystal injection hole;

Embedding the liquid crystal inlet with an encapsulant containing a spacer;

It characterized in that it comprises a step of curing the encapsulant.

On the other hand, the principle of the present invention for achieving the above object is to structurally prevent the volume shrinkage of the encapsulant caused during the curing process by injecting a spacer into the encapsulant material.

Hereinafter, an encapsulant of an LCD according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing a manufacturing method of the LCD according to the present invention, showing an encapsulant filling the liquid crystal inlet.

First, a failure turn 13 is formed outside the display area of the upper or lower substrates 11 and 17 on which the transparent electrode patterns, the alignment layer, and the color filter (not shown) are formed. The substrates 11 and 17 are made of a transparent material, for example quartz, glass or plastic.

Thereafter, another substrate is aligned and bonded to the upper portion of the substrate, and then liquid crystal is injected into the cell gap between the substrates and sealed, and heat is applied in a state of being compressed at an appropriate pressure to cure the failure turn 13.

Then, the liquid crystal injection hole 15 is embedded with the encapsulant 22 including the spacer 100 and cured to maintain the cell gap uniformly without volume shrinkage of the encapsulant. In this case, the spacer 100 is used in the same size or slightly smaller size as the cell gap of the liquid crystal substrate, but is formed in a spherical shape or a piper shape.

As described above, the LCD manufacturing method according to the present invention prevents the volume shrinkage caused during the curing process by mixing a spacer in an encapsulant sealing the liquid crystal on the liquid crystal substrate by embedding and curing the liquid crystal inlet. By maintaining the cell gap therebetween uniformly, there is an effect of improving the characteristics and reliability of the LCD device.

Claims (4)

In the manufacturing method of the liquid crystal display device which injects a liquid crystal after sealing process which joins an upper and a lower liquid crystal substrate, and embeds and seals a liquid crystal inlet, Embedding the liquid crystal inlet with an encapsulant containing a spacer; A method of manufacturing a liquid crystal display device comprising the step of curing the encapsulant. The method of claim 1, The spacer is a manufacturing method of the liquid crystal display device, characterized in that using a spherical or fiber type. The method according to claim 1 or 2, And the spacers are formed to have the same size as the cell gap of the LCD. The method according to claim 1 or 2, The spacer is a manufacturing method of the liquid crystal display device, characterized in that to form a size of about 80 ~ 90% of the cell gap.