KR100243273B1 - Manufacturing method for LCD - Google Patents

Abstract

Disclosed is a method of manufacturing a liquid crystal display by dividing a substrate having a plurality of liquid crystal display patterns formed on one surface thereof into a substrate having respective liquid crystal display patterns. This manufacturing method is characterized in that the position of the liquid crystal display pattern on each of the divided substrates is arranged on the original substrate so as to be identical to each other. According to this manufacturing method, the production capacity can be improved and the yield can be improved, which greatly contributes to the reduction of manufacturing cost. Since the arrangement pattern of the liquid crystal display after the division is the same, it is difficult to combine with the other opposite substrate. It's easy and efficient.

Description

Manufacturing method for liquid crystal display device {Manufacturing method for LCD}

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 in which a plurality of liquid crystal display patterns are formed on one substrate.

In response to the demand for personalization of display devices and space saving in the information and information era, a liquid crystal display device is used instead of the huge cathode ray tube, which has been the dominant display device. Various flat panel display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), an electro luminescence (EL), etc. have been developed and are being rapidly spread. In particular, a liquid crystal display device is a flat panel display device in which a liquid crystal technology using an optical property of a liquid crystal whose molecular arrangement is changed by an electric field and a semiconductor technology enabling fine pattern formation are fused. It is called the pronoun of.

First, the structure of a conventional general liquid crystal display device will be described with reference to the drawings.

1 is a side view illustrating a basic configuration of a conventional liquid crystal display in a side view.

A transparent electrode 3 is formed of indium tin oxide (ITO) or the like on the pair of transparent substrates 2 made of a light transmissive material such as glass, and a liquid crystal and a liquid crystal layer are formed on the transparent electrode 3. An insulating film (not shown) for insulation between the electrodes 3 and an alignment film 4 for orientation of the liquid crystal are formed in this order. In order to not only regulate the gap between the two substrates, but also to maintain a suitable thickness of the liquid crystal layer between the alignment layers 5, the spacer 6 maintains a constant cell gap, and the molecules are separated by an electric field. The liquid crystal material having the changed arrangement of is injected to form the liquid crystal layer 7. The rear surface of the substrate 2 is provided with a polarizing plate 1 for polarization of incident light and transmitted light.

In general, a liquid crystal display device having the above-described structure is formed by dividing a plurality of the same liquid crystal display pattern on one substrate and proceeding with the step, and then using the substrate. For example, FIG. 5 illustrates a case in which four liquid crystal display patterns are formed on one substrate, and as shown in the related art, liquid crystal display patterns are formed as close to the center of the substrate as possible. This is to prevent uniformity of characteristics of the liquid crystal display device and to prevent foreign substances or dust.

Conventionally, only four substrates in which the above four patterns are normally operated in manufacturing a liquid crystal display have been used. If the patterns on the first and second sides of the four patterns do not operate normally, correct the work as much as possible, but if it is impossible to correct or the work is not balanced, discard or re-form the already formed pattern. have.

In addition, in the conventional liquid crystal display manufacturing line, the majority of the substrates are conveyed one by one, and the process to be described later is performed. When conveying a board | substrate, it is common to send a short side of an original board as a conveyance width, and to send in a long side direction.

2 is a process flowchart showing a general manufacturing method of a conventional liquid crystal display device, in which four liquid crystal display patterns are formed on a glass substrate. As shown in FIG. 5, the liquid crystal element pattern is arranged as close to the center of the substrate as possible.

Next, a general manufacturing method of a conventional liquid crystal display device will be described with reference to FIGS. 2 and 5.

Initially, two substrates to be bonded are washed (step 105), and a polyimide alignment film is printed on each of four pattern surfaces to form them. Subsequently, the substrate is heat-fired and the solvent is evaporated, and the polyimide alignment film is polymerized or cured (step 110). In this state, since the liquid crystal molecules are not arranged in one direction, a so-called rubbing alignment process is performed in which the surface of the alignment film is rubbed in one direction. Since the rubbing orientation process uses a velvet cloth in many cases, a large amount of missing lint is attached to the surface of the substrate. Therefore, in order to remove this, washing after rubbing is often performed (step 115).

Next, in order to maintain a constant gap when the substrates are bonded, the spacers are scattered on one surface of one glass substrate and adhesive is printed on the periphery thereof, which is often printed using a seal mask. (Step 120).

Subsequently, the substrate and the other substrate are precisely bonded to each other so as not to be displaced up and down (step 125). For example, the substrate is pressed at a pressure of about 0.5 kg / cm 2 and the height of the original adhesive, i. The adhesive is pressed evenly to the height of the spacer, for example up to 5 μm, and then temperature is applied (step 130). Up to this process, the substrate is treated at the size of the original substrate (in this case 400 x 500 mm) before being split.

Subsequently, the substrate is divided into panels, in this example, one substrate is divided into four panels (step 135).

Next, injecting the liquid crystal first puts the chamber in a vacuum state and then dips one end of each panel into the liquid crystal. At this time, air is often introduced to utilize the pressure difference. Since the glass bends, the gap between the panels after the liquid crystal is injected becomes thicker than the diameter of the spacer and becomes uneven in plane. In order to display the liquid crystal display evenly at the forging level, it is necessary to make the intervals of the panels injecting the liquid crystal uniform at all display positions (step 140). In order to obtain a uniform panel spacing, both sides of the panel are mainly pressurized at a pressure of, for example, 0.5 kg / cm 2, and the injection hole injecting the liquid crystal is sealed in a state where the glass is not warped (step 145). Subsequently, the panel is cleaned, the liquid crystal attached to the outer surface is removed, and finally the polarizers are attached on both sides (step 150).

In the above-described manufacturing process of the liquid crystal display device, a substrate on which all of the panel patterns on the four sides of the various surfaces disposed on one large substrate, and in the above example, all operate, is used. If the patterns on the first and second sides of the four sides do not operate normally, corrective action is first performed, but if the correction is impossible or the work does not fit the profits, it is discarded or the already formed pattern is etched and formed again. In particular, it is difficult to obtain products without defects or malfunctions in all patterns in a thin film transistor process or a color filter process including a large number of process steps, thereby improving yield and improving production capacity. There was a difficult problem.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method of manufacturing a liquid crystal display device which can reduce production cost by improving production capacity and improving yield.

1 is a side view illustrating a basic configuration of a conventional liquid crystal display in a side view.

2 is a process flowchart showing a general manufacturing method of a conventional liquid crystal display.

3 is a process flowchart showing an example of a method of manufacturing a liquid crystal display according to the present invention.

4 is a schematic view showing a design of a liquid crystal display according to the present invention.

5 is a schematic view showing a design of a conventional liquid crystal display.

In order to achieve the above object, a method of manufacturing a liquid crystal display device according to the present invention is a method of manufacturing a liquid crystal display device by dividing a substrate having a plurality of liquid crystal display device patterns formed on one surface thereof into respective liquid crystal display device patterns. And the liquid crystal display pattern on each of the divided substrates is disposed on the original substrate so that the positions of the liquid crystal display patterns are the same.

According to another aspect of the present invention, a method of manufacturing a liquid crystal display device includes preparing a substrate on which a liquid crystal display pattern is formed and a substrate on which a color filter pattern is formed; Forming each of the liquid crystal display pattern and the color filter pattern so that are identical to each other, dividing the substrates firstly, orienting each of the divided substrates, and spacers on one surface of the substrate. Spreading and printing an adhesive on the periphery thereof, bonding each of the divided substrates and the opposing substrate to maintain a predetermined cell gap, and dividing the bonded substrates into respective liquid crystal cells; And injecting a liquid crystal into the cell gap of each of the bonded and divided substrates, then sealing an injection hole, and attaching a polarizing plate to a rear surface of the substrate. Is characterized in that it comprises a step.

In the present invention, in the preparing of the substrate, the liquid crystal display pattern and the color filter pattern may be formed on one surface of the substrate so that the positions of the patterns on the divided substrates are the same. The alignment of the substrate may include forming an alignment layer on the substrate, firing the alignment layer, rubbing the alignment layer, and cleaning the substrate. The bonding of the substrate may include bonding the substrate on which the liquid crystal display pattern is formed to the substrate on which the color filter pattern is formed, pressing the bonded substrate to a predetermined pressure, Curing the formed adhesive.

According to the present invention, the production capacity can be improved and the yield can be improved, thereby greatly contributing to the reduction of manufacturing cost, and since the arrangement pattern of the liquid crystal display after the division is the same, it is easy to combine with the other opposite substrate. Efficient

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

5 is a schematic view showing a design of a liquid crystal display according to the present invention.

As mentioned above, in order to prevent uniformity of the characteristics of the liquid crystal display to be formed and contamination of foreign matter or dust, the liquid crystal display patterns are disposed as close to the center of the substrate as possible (see FIG. 5). The substrates thus placed were bonded together, sealed and cured and then divided into four panels in this case. Therefore, after dividing the substrate, two other substrates are produced, which is inefficient in that a combination with another substrate to be polymerized is considered.

However, in the present invention, as shown in Fig. 4, the position of the pattern on each substrate after the division is designed to be the same at the center of the long side. Therefore, two board | substrates with the same pattern position are obtained after division | segmentation. For this reason, the combination with the other board | substrate to be joined becomes simple and becomes efficient. Moreover, since the width | variety (short side) which conveys a board | substrate remains, it can convey, without needing to improve especially a conventional manufacturing line. Of course, it can be donated to production in a conventional manufacturing line even before the division.

3 is a process flowchart showing an example of a method of manufacturing a liquid crystal display according to the present invention, and a method of manufacturing the liquid crystal display according to an embodiment of the present invention will be described with reference to FIG. 5. In the Example of this invention, the thing in which the pattern used as a liquid crystal panel is formed in four surfaces is used. The pattern on one side of this is a malfunction, which has not been used because it is a bad substrate. The said pattern is formed so that the position in each divided board | substrate may mutually be the same.

First, the substrate on which the four-sided pattern is formed is divided at the center (step 200). At this time, since the four-sided pattern was designed to be identical in position on the long side after dividing, the two divided substrates are identical. Of course, in this embodiment, the substrate is divided in half, but the number and method of dividing can be arbitrarily determined if the arrangement of the pattern of the substrate after the division is the same in each substrate.

Next, the divided substrate is washed with a pure ultrasonic layer for several minutes and twice, and then the surface is dried, dried on a hot plate, and cooled (step 205).

After spin-coating a polyimide, for example, to a predetermined thickness on the surface of the cleaned and dried substrate with an alignment film, the substrate is heated to evaporate the solvent. Next, the substrate is heated and baked for 30 minutes while passing through an oven at about 200 ° C. to polymerize the alignment film (step 2110). Subsequently, in order to align the liquid crystal molecules in one direction, the substrate coated with the alignment film is rubbed in one direction to perform a rubbing alignment process. Since the rubbing alignment process uses a velvet cloth, a large amount of missing lint is attached to the surface of the substrate, and a rubbing cleaning is performed to remove it (step 215).

Next, the spacer is spread on one surface of one substrate and then the adhesive is printed on the other substrate using a seal mask (step 220). Next, the upper and lower substrates are precisely controlled so as not to be displaced (step 225), and the substrate is uniformly pressurized with a pressure of about 0.5 kg / cm 2 until the height of the original adhesive is about 30 µm to about 5 µm. Next, the substrate is heated to cure the adhesive (step 230).

Subsequently, the first divided substrate is divided into respective panels. That is, two substrates which have already been primaryly divided are overlapped, and then one substrate is divided into two panels (step 235).

In this state, the liquid crystal injection process is as follows. The chamber is first vacuumed, and one end of the panel is immersed in liquid crystal. The liquid crystal is then injected between the two bonded substrates using a pressure difference by introducing air (step 240). The gap between the panels after the liquid crystal injection becomes thicker than the thickness of the spacer due to the bending of the glass and the inner surface becomes uneven. After that, the injection hole is sealed by irradiating with ultraviolet rays (step 245).

Next, the liquid crystal is injected, the encapsulated panel is cleaned, the liquid crystal attached to the outer surface is removed, and finally, the polarizing plates are attached to both surfaces of the panel (step 250) to complete the liquid crystal display.

It was found that the front surface was turned on by applying an alternating current of 60 mA to the liquid crystal display manufactured according to the exemplary embodiment of the present invention. The display performance was not different from that of the conventional method. In the test of reliability, it showed good performance.

Although the present invention has been described in detail above, the present invention is not limited to the above embodiments, and many modifications are possible by those skilled in the art within the technical idea of the present invention.

According to the manufacturing method of the liquid crystal display device according to the present invention described above, in the method of manufacturing a liquid crystal display device by designing a plurality of liquid crystal display patterns on a substrate and dividing the substrate into respective liquid crystal display patterns, the division The positions of the liquid crystal display patterns on the respective substrates are arranged on the original substrate so as to be identical to each other. Therefore, by being able to apply the substrate, which has been a defective product up to now, the production capacity can be improved and the yield can be improved, which can greatly contribute to reducing the manufacturing cost.

In addition, since the substrate was originally segmented leaving the short side of the substrate, the substrate can be transported in the existing manufacturing equipment in that state. For this purpose, no special equipment is required to be retrofitted, so that it can be processed under conventional manufacturing facilities and process conditions, and the finished panel does not have a deterioration in performance as compared with the prior art. Moreover, since the arrangement pattern of the liquid crystal display device after division is the same, it is easy and efficient to combine with the other board | substrate which opposes.

In the above embodiment, the original substrate is divided into half, but the number and method of dividing can be arbitrarily determined, and the same result can be obtained if the arrangement of the substrate liquid crystal display pattern after the division is the same on each substrate. have. Of course, the size of the original substrate, the number of patterns formed therein may be arbitrarily selected, and in the present embodiment, the segment is divided to leave the width of the short side of the substrate. .

Claims (4)

A method of manufacturing a liquid crystal display device by dividing a substrate having a plurality of liquid crystal display patterns formed on one surface thereof into a substrate having respective liquid crystal display patterns. And disposing the liquid crystal display pattern on the original substrate so that the positions of the liquid crystal display patterns on the divided substrates are the same. Preparing a substrate on which a liquid crystal display pattern is formed and a substrate on which a color filter pattern is formed, and respectively forming the liquid crystal display pattern and the color filter pattern such that the positions of the patterns on the divided substrates are the same; ; Firstly dividing the substrates; Orienting each of the divided substrates; Dispersing a spacer on one surface of the substrate and printing an adhesive on a periphery thereof; Bonding the divided substrates and the opposing substrate to maintain a predetermined cell gap; Dividing the bonded substrates into respective liquid crystal cells; Injecting liquid crystal into a cell gap of each of the bonded and divided substrates, and then sealing an injection hole; And And attaching a polarizing plate to a rear surface of the substrate. The method of claim 2, wherein aligning the substrate comprises: Forming an alignment layer on the substrate; Firing the alignment layer; Rubbing the alignment layer, and And cleaning the substrate. The method of claim 2, wherein the bonding of the substrate, Bonding the substrate on which the liquid crystal display pattern is formed to the substrate on which the color filter pattern is formed; Pressurizing the bonded substrate to a predetermined pressure; And curing the adhesive formed on the substrate.