KR20060031337A - Method for filling liquid crystal in liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal injection method of a liquid crystal display device capable of shortening the liquid crystal injection time. The method includes seating a first substrate on a heating plate; Spraying solid liquid crystal grains on the first substrate; Heating the heating plate to melt the solid liquid crystal grains to form a liquid crystal layer on the first substrate; And bonding the second substrate onto the resultant obtained therefrom.

Description

Method for filling liquid crystal in liquid crystal display device

1A to 1D are cross-sectional views of respective processes illustrating a liquid crystal injection method of a liquid crystal display device according to the prior art.

2A to 2D are cross-sectional views for each process showing the liquid crystal injection method of the liquid crystal display device according to the present invention.

Explanation of symbols on the main parts of the drawings

20: heating plate 21: first substrate

22: solid crystal grains 22a: liquid crystal layer

23: second substrate 24: end sealant

30: solid liquid crystal container

The present invention relates to a liquid crystal injection method of a liquid crystal display device, and more particularly, to a liquid crystal injection method of a liquid crystal display device which can shorten the liquid crystal injection time and reduce the defective rate.

The liquid crystal display device injects a liquid crystal between two transparent substrates, for example, glass substrates, and attaches a polarizing plate to the outer surface of the substrate, and applies an electrical signal input to an electrode located between the two substrates. Accordingly, the liquid crystal is operated to adjust the polarization direction of light passing through the polarizer to control the passage and blocking of light.

Here, the liquid crystal injection method of the conventional liquid crystal display device is to inject the liquid crystal between the two substrates using a capillary phenomenon and the pressure difference, this liquid crystal injection method is a vacuum exhaust device, a vacuum chamber, a predetermined moving device, a liquid crystal It requires a tray and a gas injector.

1A to 1D are cross-sectional views of respective processes illustrating a liquid crystal injection method of a conventional liquid crystal display.

As shown in FIG. 1A, first, the inside of the chamber 10 is kept in a vacuum state through a vacuum exhaust (dashed arrow) to remove bubbles in the cell 11 (first step).

Subsequently, as shown in FIG. 1B, the liquid crystal injection hole 15 is held in the liquid crystal tray 12 by using a predetermined moving device (not shown) while the chamber 10 is sealed with the sealing member 17. It contacts or deposits on the surface of the liquid crystal 13 which exists. 1C, the liquid crystal 13 is injected into the cell 11 by capillary action (second step).

Subsequently, as shown in FIG. 1D, when a gas such as nitrogen (N ₂ ) is gradually injected into the vacuum chamber 10, a pressure difference occurs in the cell 11 and the chamber 10, so that the liquid crystal 13 is a cell. (11) The empty space inside is filled (third step).

However, the liquid crystal injection method of the conventional three-step liquid crystal display device has a problem in that the amount of liquid crystal consumption is large, and the liquid crystal injection time is required to be 10 hours or more. In addition, since impurities such as bubbles flow into the liquid crystal injection hole, contamination such as spots may occur, thereby increasing a defective rate.

Accordingly, the present invention was created to solve the above problems inherent in the liquid crystal injection method of the liquid crystal display device according to the prior art, and an object of the present invention is to reduce the consumption of liquid crystal and to shorten the liquid crystal injection time. The present invention provides a liquid crystal injection method of a liquid crystal display device which can reduce the defect rate by preventing contamination through the liquid crystal injection hole.

In order to achieve the above object, according to one aspect of the present invention, there is provided a liquid crystal injection method of a liquid crystal display device, comprising: mounting a first substrate on a heating plate; Spraying solid liquid crystal grains on the first substrate; Heating the heating plate to melt the solid liquid crystal grains to form a liquid crystal layer on the first substrate; And bonding the second substrate onto the resultant obtained therefrom.

According to another aspect of the invention, the step of spraying the solid crystal grains, using a spray method.

According to another aspect of the invention, the first substrate is any one selected from the group consisting of an array substrate and a color filter substrate.

According to yet another aspect of the invention, the method further comprises, after bonding the second substrate, sealing with an end sealant.

(Example)

Liquid crystal refers to a substance indicating the position between molecules and the direction of the molecular axis intermediate between a state having perfect regularity as seen in a solid state and an irregular state as seen in a normal isotropic liquid. Such a liquid crystal retains its properties as a liquid crystal which is an intermediate phase in a certain temperature range, but causes a phase change to a solid, a liquid crystal, or a liquid due to an increase or decrease in temperature.

The arrangement and movement of the liquid crystal molecules are changed by stimulus such as heat applied from the outside, but when the externally applied change is restored to the original original state, the liquid crystal is also restored to the original original state.

The present invention uses the intrinsic properties of the liquid crystal as described above, and uses a method of freezing the liquid crystal to change to a solid state, and then defrosting the liquid crystal after performing a predetermined process to restore the original liquid crystal state.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2A to 2D are cross-sectional views of respective processes illustrating a liquid crystal injection method of the liquid crystal display according to the present invention.

As shown in FIG. 2A, a solid liquid crystal storage in which a first substrate 21 is seated on a heating plate 20 and a solid liquid crystal grain 22 is stored on the first substrate 21 is disposed. Prepare the container 30. The first substrate 21 may be an array substrate of a liquid crystal display, or may be a color filter substrate. The solid crystal grains 22 are made of a liquid state by freezing the liquid crystal.

Subsequently, as shown in FIG. 2B, the solid liquid crystal grains 22 are sprayed onto the first substrate 21 using a spray method.

Then, as shown in FIG. 2C, the heating plate 20 is heated to melt the solid liquid crystal grains to form the liquid crystal layer 22a on the first substrate 21. Then, the formation time of the liquid crystal layer 22a, that is, the liquid crystal injection time is shortened within several minutes, and the liquid crystal consumption is reduced. In addition, there is no need to form a liquid crystal injection hole separately, and there is no fear that impurities such as bubbles are introduced through the liquid crystal injection hole.

On the other hand, the temperature and time for melting the solid liquid crystal grains are determined in consideration of the thermal characteristics of the liquid crystal material and the material of the first substrate 21.

Thereafter, as shown in FIG. 2D, the second substrate 23 is bonded onto the resultant obtained therefrom, and then sealed with the end sealant 24.

According to the configuration as described above of the present invention, by spraying the solid crystal grains, and then heating them to form a liquid crystal layer, the liquid crystal injection time that is conventionally required for more than 10 hours can be shortened in minutes, the liquid crystal consumption Can be reduced. In addition, since it is not necessary to separately form the liquid crystal injection hole, it is possible to reduce the defective rate due to contamination generated through the liquid crystal injection hole.                     

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not so limited and it is intended that the invention be limited without departing from the spirit or field of the invention as set forth in the following claims It will be readily apparent to one of ordinary skill in the art that various modifications and variations can be made.

Claims (4)

In the liquid crystal injection method of the liquid crystal display device, Mounting a first substrate on a heating plate; Spraying solid liquid crystal grains on the first substrate; Heating the heating plate to melt the solid liquid crystal grains to form a liquid crystal layer on the first substrate; And Adhering a second substrate on the resultant obtained from the liquid crystal injection method. The method of claim 1, The spraying the solid crystal grains, the liquid crystal injection method of the liquid crystal display device, characterized in that using the spray method. The method of claim 1, And the first substrate is any one selected from the group consisting of an array substrate and a color filter substrate. The method of claim 1, The method may further include, after the step of adhering the second substrate, sealing with an end sealant.

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