KR19990028070A - Manufacturing method of liquid crystal display device for preventing spread of end seal - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device which prevents spreading of an end seal. In the manufacturing method, by reducing the shrinkage of the end seal by forming a gasket of the same material as the seal pattern or by installing a guide in the liquid crystal inlet portion during the sealing process by maintaining a constant cell gap between the liquid crystal inlet and the other portion It is a technology that can prevent the rainbow phenomenon caused in the display area, and thereby improve the characteristics of the LCD device.

Description

Manufacturing method of liquid crystal display device for preventing spread of end seal

The present invention relates to a method for manufacturing a liquid crystal display device for preventing spreading of an end seal, and in particular, injecting liquid crystal into a liquid crystal inlet formed on one side of a failure turn sealing the upper and lower liquid crystal substrates, and then The present invention relates to a method of installing a guide and forming an end seal, or forming an end seal spread prevention dam around a liquid crystal injection hole.

LCD, a type of flat panel display, is an apparatus that changes the optical anisotropy by applying an electric field to a liquid crystal that combines liquidity and optical properties of crystals, and consumes more power than conventional cathode ray tubes. Its low size, small size, large size and high definition make it widely used.

In general, the LCD panel is configured in such a way that the upper and lower liquid crystal substrates on which the transparent electrode patterns are formed are bonded by a failure turn formed with the liquid crystal inlet, and the liquid crystal is sealed in the gap between them.

1A to 1E are cross-sectional views and a plan view illustrating an LCD manufacturing method according to the prior art, and FIG. 1E is a cross-sectional view showing a section of ⓑ-ⓑ 'of FIG. 1D.

First, a transparent electrode pattern (not shown) made of indium thin oxide is formed on the transparent substrate 11 of quartz material, and a protective film (not shown) is provided to prevent a short circuit of the transparent electrode pattern. ) And an alignment film (not shown) for arranging the liquid crystal are sequentially formed.

Subsequently, the lower liquid crystal substrate 11 is completed by using a rubbing roll (not shown) wound around a cylindrical core to give direction to the alignment layer, and then the upper liquid crystal substrate 13 having a common electrode. The spacers 19 and the failure turns 15 are formed and sealed so that the upper liquid crystal substrate 13 and the lower liquid crystal substrate 11 have a constant cell gap, and the liquid crystal 17 is injected into the cell gap. (FIG. 1A)

Then, the liquid crystal is injected and the expanded substrate is pressurized using the pressurizing device 21 to make the cell gap constant (FIG. 1B).

Due to the pressing process, the liquid crystal 23 between the upper and lower liquid crystal substrates flows out into the liquid crystal inlet. (FIG. 1C)

Then, the liquid crystal 23 flowing out of the liquid crystal inlet is removed, and then embedded in the end chamber 25 and cured with a UV curing lamp while decompressing the liquid crystal. In this case, the end chamber 25 is formed of a material such as polyimide, which is fluid in a liquid state, and the end chamber contracts during the curing process, so that the liquid crystal substrate is bent like the ⓐ portion, and is sucked into the cell to be rainbow in the display area. Causes phenomenon 27.

As described above, in the LCD manufacturing method according to the prior art, the end chamber process is sucked into the liquid crystal substrate when the end chamber with fluidity is injected, or spreads and the end chamber is contracted during the curing process, so that the liquid crystal substrate is similar to the ⓐ portion. This deflection makes it difficult to keep the cell gap constant, and causes a rainbow phenomenon 27 in the display area of the substrate, thereby degrading the characteristics and reliability of the device. (FIGS. 1C, 1D, 1E)

Accordingly, the present invention is to solve the problems of the prior art, the cell gap shrinks during the curing process of the end chamber spread in the liquid crystal inlet by installing a guide or gasket around the liquid crystal inlet before sealing the liquid crystal inlet It is an object of the present invention to provide a method for forming an end seal preventing device for minimizing a phenomenon to maintain a constant cell gap of a device and thereby improve device characteristics and reliability.

1A to 1E are cross-sectional views and plan views illustrating an LCD manufacturing method according to the prior art.

2A is a plan view of an LCD having a guide according to a first embodiment of the present invention;

2B and 2C are plan views of LCDs having gaskets according to a second embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

11, 12, 13: liquid crystal substrate, 15, 16: thread, 14: guide, 17, 23: liquid crystal, 18, 25: end seal, 19: spacer, 20, 22: gasket, 21: pressurizing device, 27: rainbow Phenomenon, ①: Spreading distance of the end seal from the liquid crystal inlet, ②: Distance of encapsulant suction from the end of the liquid crystal substrate, ⓐ: Defective area of cell gap

In order to achieve the above object, the first characteristic of the method for forming the spreading prevention device of the end seal according to the present invention,

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 inlet,

After forming a guide in the liquid crystal inlet portion to form an end chamber for embedding the liquid crystal inlet and removing the guide.

Further, in order to achieve the above object, the second feature of the method for forming the spreading prevention device of the end seal according to the present invention,

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 inlet,

A failure turn is formed on the upper or lower liquid crystal substrate, and an end seal spreading gasket is formed on the liquid crystal inlet.

Hereinafter, a method of forming an apparatus for preventing spreading of an end seal according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2A is a cross-sectional view illustrating a method of forming an apparatus for preventing spreading of an end seal according to a first exemplary embodiment of the present invention, and showing a guide in a liquid crystal inlet.

First, a failure turn is formed outside the display area of the upper or lower liquid crystal substrate 12 on which the transparent electrode patterns, the alignment layer, and the color filter (not shown) are formed. The substrate 12 is made of a transparent material, for example, quartz, glass, or plastic.

Thereafter, another substrate (not shown) is aligned and bonded to the upper portion of the substrate 12, and then liquid crystal is injected into the cell gap through the liquid crystal inlet between the substrates, and then pressure is applied through the pressurizing device.

The liquid crystal spilled into the liquid crystal inlet by the pressing process is removed, and a guide 14 is provided to expose the liquid crystal inlet. The guide 14 is for preventing the end chamber from spreading widely in the liquid crystal inlet portion during the end chamber process.

Then, the liquid crystal inlet exposed to the guide 14 is embedded in the end seal and sealed. At this time, if the pressure of the pressure device is slightly lowered, the end chamber having fluidity fills the liquid crystal inlet.

After sealing the liquid crystal inlet with the end chamber, the guide 14 is removed and the end chamber is cured.

2B and 2C are plan views illustrating a method of forming an apparatus for preventing spreading of an end seal according to a second exemplary embodiment of the present invention, in which a gasket is formed.

First, a failure turn 16 is formed outside the display area of the upper or lower liquid crystal substrate 12 on which the transparent electrode patterns, the alignment layer, and the color filter (not shown) are formed.

In the process of forming the seal pattern 16, spherical or bar shaped gaskets 20 and 22 are formed around the liquid crystal injection hole with sealants of the same type as the seal pattern 16.

Then, the upper liquid crystal substrate and the lower liquid crystal substrate 12 are bonded to each other, and the liquid crystal is injected through the liquid crystal inlet.

Thereafter, pressure is applied to the bonded substrate by using a pressurizing device, and the liquid crystal flowing out of the pressurizing process is removed.

Subsequently, when the end chamber 18 is embedded in the liquid crystal injection hole and sealed, and a curing process is performed, the shrinkage of the end seal is not concentrated toward the liquid crystal injection hole, but is dispersed toward the gasket to reduce the shrinkage rate.

As described above, the method for forming an end seal spreading device according to the present invention is a method for manufacturing a liquid crystal display device in which a liquid crystal is injected after a sealing step of joining upper and lower liquid crystal substrates, and a liquid crystal injection hole is embedded and sealed. In this case, by installing a guide or gasket in the liquid crystal inlet portion to prevent the end chamber from spreading to reduce the shrinkage of the end chamber and thereby prevent the bending phenomenon of the liquid crystal substrate to maintain a constant cell gap between the liquid crystal inlet and the other portion, There is an advantage of preventing the occurrence of the rainbow phenomenon in the liquid crystal of the liquid crystal inlet portion.

Claims (3)

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 inlet, And installing a guide in the liquid crystal inlet, and then embedding the liquid crystal inlet into the end chamber and removing the guide. 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 inlet, And forming a gasket at the liquid crystal inlet while simultaneously forming a failure turn on the lower liquid crystal substrate. The method of claim 2, wherein the gasket is formed in a spherical shape or a bar shape.