KR19980057666A - Manufacturing method of liquid crystal display device - Google Patents

Abstract

The manufacturing method of a liquid crystal display element is started. In the method of manufacturing the liquid crystal display device, a liquid crystal is injected by bonding a first step of forming an active layer and an alignment layer on opposite surfaces of upper and lower substrates respectively, and bonding the edges of the opposite surfaces of the upper and lower substrates as a real injection hole. A second step of forming a closed space, a third step of injecting liquid crystal into the closed space through the injection hole, and pressing the liquid crystal display element into which the liquid crystal is injected using a roller to maintain a constant gap between the upper and lower substrates And a fifth step of sealing the injection hole in a state where the cell gap is kept constant, which is spread according to the man-hour according to the maintenance of the cell gap and the cell gap adjustment of the liquid crystal display device. Has the advantage of reducing.

Description

Method of manufacturing a liquid crystal display device.

The present invention relates to a method for manufacturing a liquid crystal display device, and more particularly, to a method for manufacturing a liquid crystal display device for maintaining a constant interval of the inner surface of the upper and lower substrates by pressing the liquid crystal display device when the injection of the liquid crystal is completed. It is about.

A liquid crystal display is a light receiving element that receives light from the outside and is visible. The power consumption is very small compared to other devices, and it is possible to produce various sizes from ultra small to large, and to diversify display patterns. Therefore, it occupies a very important position in the display device field.

1 shows an example of a liquid crystal display device having such characteristics.

It is installed to be opposed to each other, the upper and lower substrates (11, 11 ') made of a transparent material, and the upper and lower electrodes formed in a predetermined matrix type on the surface of the upper and lower substrates (11, 11') opposite to each other ( 12) 12 ', the alignment layers 13 and 13' formed on the upper and lower substrates 11 and 11 'on which the upper and lower electrodes 12 and 12' are formed, and applied to the edges of the upper and lower substrates. The sealing member 14 is provided with a space portion into which the liquid crystal 15 is injected and a liquid crystal injection hole (not shown).

In the liquid crystal display device configured as described above, in order to inject the liquid crystal 15 into the closed space of the upper and lower substrates 11 and 11 ′, the injection hole is immersed in the liquid crystal after the closed space is maintained in a high vacuum. The liquid crystal is injected into the space portion by maintaining the surrounding position at atmospheric pressure.

When the liquid crystal is injected into the space portion of the liquid crystal display device 10 as described above, the cell gap, which is an interval between the opposing surfaces of the upper substrate 11 and the lower substrate 11 ′, is not constant. .

Therefore, the method for maintaining a constant cell gap when the injection of the liquid crystal 15 is completed, as shown in Figure 2 using the plate-shaped members 16, 17 from the upper and lower surfaces of the upper and lower substrates 11, 11 ' By pressing the upper and lower substrates (11, 11 ') to be kept constant. In this case, since the liquid crystal display device must be interposed between the plate members 16 and 17, a lot of work is required accordingly. In particular, the state of the cell gap depends on the smoothness of the plate members 16 and 17. As a result, there is a problem in that the substrate members 16 and 17 must be precisely processed.

This phenomenon is more severe as the liquid crystal display device becomes larger, and the unevenness of the cell gap has a problem that an unevenness of an image formed by the liquid crystal display device occurs.

In addition, the above-described method has a problem in that the cell gap of the liquid crystal display devices is severely distributed because a plurality of liquid crystal display devices are stacked and worked.

The present invention has been made to solve the above problems, and can provide a method of manufacturing a liquid crystal display device that can maintain a constant cell gap between the upper substrate and the lower substrate at each site, and can greatly reduce the labor required by maintaining the cell gap. Has its purpose.

Another object of the present invention is to provide a method for manufacturing a liquid crystal display device that can reduce the defective rate of the liquid crystal display device due to the cell gap defect.

1 is a cross-sectional view of a general liquid crystal display device;

2 is a view showing a method of pressing using a plate member to maintain a cell gap of a liquid crystal display device;

3A to 3C are views showing the method of manufacturing the liquid crystal display device according to the present invention step by step;

Figure 4 is a side view schematically showing a state using a roller for maintaining the cell gap.

Brief description of symbols for parts in the drawings

21; Upper substrate 22; Lower substrate

23; Actual 40, 51, 52; roller

In order to achieve the above object, the present invention provides a liquid crystal by bonding a first step of forming an active layer and an alignment layer respectively on opposite surfaces of upper and lower substrates, and bonding the edges of the opposite surfaces of the upper and lower substrates as an injection hole. A second step of forming a closed space into which the liquid crystal is injected; a third step of injecting liquid crystal into the closed space through the injection hole; and pressing a liquid crystal display element into which the liquid crystal is injected using a roller to maintain a distance between the upper and lower substrates And a fifth step of sealing the injection hole in a state where the cell gap is kept constant.

In the fourth step, pressurization of the liquid crystal display device is performed by passing the liquid crystal display device between a pair of rollers which are maintained at predetermined intervals from each other.

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

A method of manufacturing a liquid crystal display device according to the present invention is to maintain a constant cell gap between upper and lower substrates. In this method, an electrode having a predetermined pattern is formed on opposite surfaces of upper and lower substrates, and an alignment layer is formed on the surface on which the electrodes are formed. To form. As shown in FIG. 3A, the edges of the upper substrate 21 or the lower substrate 22 are bonded together as the actual material 23 to form a space portion into which the liquid crystal is injected. When the formation of the space portion is completed as described above, the liquid crystal is injected into the cantilever portion as shown in FIG. 3B. ). As described above, when the injection hole 23a is immersed in the liquid tank contained in the container, the liquid crystal is injected into the space portion by the vacuum pressure of the space portion.

When the supply of the liquid crystal is completed as described above, the supply of the liquid crystal is not made quantitatively, so that the cell gap, which is an interval between the upper and lower substrates 21 and 22, becomes non-uniform at each portion, and the process for fixing the non-uniform cell gap is performed. In this process, as shown in FIG. 3C, the liquid crystal display device 20 having the upper and lower substrates bonded thereto is placed on the base plate member 41 having a high smoothness, and then moved horizontally with respect to the top surface of the base plate member 41. The upper surface is pushed by the rollers 40 to discharge the liquid crystals excessively supplied to the space. In this way, the cell gap passing between the base plate member 41 and the roller is made constant, and then the injection hole is sealed. The cell gap may be maintained by passing the liquid crystal display device 20 between a pair of rollers 51 and 52 spaced apart from each other in parallel to each other as shown in FIG. 4.

Maintaining the cell gap of the liquid crystal display element space portion into which the liquid crystal is injected using the method according to the present invention as described above has the following effects.

first; Since the cell gap is maintained by pressing as a roller, the labor required for maintaining the cell gap can be greatly reduced.

second; In each liquid crystal display device, dispersion due to the adjustment of the cell gap can be reduced.

third; The resolution of the image can be improved by keeping the cell gap of the liquid crystal display element constant.

As described above, the manufacturing method of the liquid crystal display device of the present invention is not limited to the above-described embodiment and can be modified within the technical scope of the present invention.

Claims (2)

A first step of forming an active layer and an alignment layer on surfaces of the upper and lower substrates opposed to each other, A second step of forming a closed space into which liquid crystal is injected by bonding edges of the upper and lower substrates opposite to each other as a substance having an injection hole; Injecting liquid crystal into the closed space through the injection hole; Pressurizing the liquid crystal display element into which the liquid crystal is injected using a roller to maintain a constant gap between the upper and lower substrates; And a fifth step of sealing the injection hole while the cell gap is kept constant. The method of manufacturing a liquid crystal display device according to claim 1, wherein the liquid crystal display device pressurization in the fourth step is performed by passing the liquid crystal display device between a pair of rollers which are spaced apart from each other at predetermined intervals.