KR101023721B1 - Liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a liquid crystal display and a method for manufacturing a liquid crystal display and a liquid crystal dropping margin when the liquid crystal display device of the small size is manufactured by the liquid crystal dropping method, comprising: a first substrate in which a plurality of liquid crystal panel regions are designed; And a sealing material formed at an edge of the liquid crystal panel region between the first and second substrates so as to have a connection passage between the second substrate and the at least two adjacent liquid crystal panel regions.

Liquid crystal dropping method Liquid crystal display device, sealing material pattern, manufacturing method of liquid crystal display device

Description

Liquid crystal display device and method for manufacturing the same

1 is a flowchart illustrating a manufacturing process of a liquid crystal display device of a conventional liquid crystal dropping method.

2 is a layout view of a liquid crystal panel of a mother substrate according to a conventional liquid crystal dropping method

3A to 3F are process plan views or cross-sectional views of a liquid crystal display device of a conventional liquid crystal dropping method.

4A to 4C are cross-sectional views illustrating a liquid crystal leak phenomenon when a conventional small liquid crystal display device is manufactured by a liquid crystal dropping method.

5A to 5B are cross-sectional views illustrating a change in cell panel of a panel according to a change in the amount of liquid crystal dropped when a conventional small liquid crystal display is manufactured by a liquid crystal dropping method.

6 is a layout view of a liquid crystal panel according to the present invention.

FIG. 7 is a cross-sectional view taken along line II-II ′ of FIG. 6.

FIG. 8 is a cross-sectional view taken along line III-III 'of FIG. 6

9A to 9E are cross-sectional views of a liquid crystal display device of a liquid crystal dropping method according to the present invention.

Explanation of symbols for the main parts of the drawings

1a, 1b: liquid crystal panel region 2: liquid crystal

3: sealing material 7: connecting passage                 

10, 20: substrate

The present invention relates to a liquid crystal display device and a manufacturing method, and more particularly, to a liquid crystal display device and a manufacturing method for securing a liquid crystal leak and a liquid crystal drop margin when manufacturing a small size liquid crystal display device by a liquid crystal dropping method.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, the LCD (Lipuid Crystal Display Device), PDP (Plasma Display Panel), ELD (Electro Luminescent Display), and VFD (Vacuum Fluorescent) Various flat panel display devices such as displays have been studied, and some of them are already used as display devices in various devices.

Among them, LCD is the most widely used, replacing the CRT (Cathode Ray Tube) for mobile image display because of its excellent image quality, light weight, thinness, and low power consumption. In addition, it is being developed in various ways, such as a television for receiving and displaying broadcast signals, and a monitor of a computer.

Such a liquid crystal display may be largely divided into a liquid crystal panel displaying an image and a driving unit for applying a driving signal to the liquid crystal panel, wherein the liquid crystal panel has a predetermined space and is bonded to the first and second glass substrates. And a liquid crystal layer injected between the first and second glass substrates.

The first glass substrate (TFT array substrate) may include a plurality of gate lines arranged in one direction at a predetermined interval, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, and A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing each gate line and data line, and a plurality of thin films that transmit signals of the data line to each pixel electrode by being switched by signals of the gate line Transistors are formed.

The second glass substrate (color filter substrate) includes a black matrix layer for blocking light in portions other than the pixel region, an R, G and B color filter layer for expressing color colors, and a common electrode for implementing an image. Is formed.

The first and second substrates have a predetermined space by spacers and are bonded by a sealant to inject liquid crystal between the two substrates.

At this time, in the liquid crystal injection method, the liquid crystal is injected between the two substrates by osmotic pressure when the liquid crystal injection hole is immersed in the liquid crystal liquid by maintaining the vacuum state between the two substrates bonded by the real material. When the liquid crystal is injected as described above, the liquid crystal injection hole is sealed with a sealing material.

However, in the general method of manufacturing the liquid crystal injection type liquid crystal display device, since the liquid crystal injection hole is immersed in the liquid crystal liquid while the two substrates are kept in a vacuum state, the liquid crystal injection takes a long time, and thus productivity is lowered. In addition, in the case of manufacturing a large-area liquid crystal display device, when the liquid crystal is injected by the liquid crystal injection method, the liquid crystal is not completely injected into the panel, which causes a defect.

Accordingly, most of the liquid crystal display devices for mobile phones or PDAs are produced by liquid crystal injection, and large size liquid crystal display devices are manufactured by dropping liquid crystals. However, in order to improve productivity, it is also necessary to manufacture a small liquid crystal display device in a dropping manner.

The manufacturing method of the conventional liquid crystal display device using the liquid crystal dropping method is as follows.

1 is a flowchart illustrating a manufacturing process of a liquid crystal display device of a conventional liquid crystal dropping method, FIG. 2 is a layout view of a liquid crystal panel of a mother substrate according to a conventional liquid crystal dropping method, and FIGS. 3A to 3F are liquid crystal displays of a conventional liquid crystal dropping method. Process plan view or cross section of the device.

First, in the method of manufacturing a liquid crystal display device of the liquid crystal dropping method, rather than forming one liquid crystal panel on one glass substrate, as shown in FIG. 2, the substrate 10 or 20 larger than the size of the unit liquid crystal panel is shown. ), A plurality of liquid crystal panels 1 are designed. Accordingly, a thin film transistor array (TFT-array) (not shown) is formed in each liquid crystal panel 1 region of the first substrate, and the color filter array C is formed in each liquid crystal panel 1 region of the second substrate. / F array) (not shown) (1S, 5S). At this time, a column spacer (patterned spacer) (not shown) is formed on the second substrate after the color filter array is formed to uniformly hold the selves after the bonding of the first and second substrates. do.

After forming an alignment film for aligning liquid crystals on the first and second substrates and rubbing the alignment films (2S and 6S), the first and second mother substrates are cleaned (3S and 7S), respectively. .

As shown in FIG. 3A, an appropriate amount of liquid crystal 2 is dropped in each liquid crystal panel 1 region of the first substrate 10 (4S). At this time, it is preferable that the liquid crystal 2 is dropped in the center portion of each liquid crystal panel 1 and the liquid crystal does not come into contact with the sealing material until the sealing material is completely cured to maintain the cell.

As shown in FIG. 3B, the sealing material 3 and the Ag dot 4 are dispensed at the edge of each liquid crystal panel 1 region of the second substrate 20 (8S). At this time, the sealing material 3 is patterned independently in each liquid crystal panel region.

The first and second substrates 10 and 20 formed as described above are placed in a vacuum bonding chamber (not shown), and then the two substrates are bonded (9S).

That is, as shown in FIG. 3C, the second substrate 20 is inverted so that the sealing material 3 faces downward, and is positioned on the upper stage (not shown in the drawing) of the vacuum adapter chamber. The first substrate 10 on which the liquid crystal 2 is dropped is placed on a lower stage (not shown in the drawing) of the vacuum adapter chamber. Then, the inside of the vacuum adapter chamber is maintained in a vacuum state, and the first and second substrates are bonded together as shown in Fig. 3D. At this time, it is preferable that the dropped liquid crystal 2 does not move to the sealing material 3.

The first and second substrates 10 and 20 bonded as described above are loaded from the vacuum adapter chamber into a UV curing furnace (not shown) to cure the sealing material using UV in a UV curing furnace. (10S). That is, as shown in FIG. 3e, UV is irradiated to the sealing material 3 using the mask 5 having the light shielding film 6 formed thereon so that only the portion where the sealing material is formed may be selectively irradiated with UV. The sealing material 3 is UV cured.

And, although not shown in the figure, the UV cured substrate is loaded from a UV curing furnace to a thermal curing furnace to thermally cure the sealing material 3 (11S). At this time, the liquid crystal dropped on each liquid crystal panel starts to spread.

When the UV and thermal curing processes are completed as described above, as shown in FIG. 3F, the first and second substrates 10 and 20 are cut by unit liquid crystal panels (12S) and polished by unit liquid crystal panels. It is shipped after the inspection process (13S) (14S, 15S).

When the liquid crystal display device is formed by the liquid crystal dropping method as described above, the time taken to inject the liquid crystal can be drastically reduced, so that the productivity is improved, and in the case of a large size, the liquid crystal is not completely injected, thereby preventing defects. .

However, when the small liquid crystal display device is manufactured by the conventional liquid crystal dropping method, there are the following problems.

First, when the liquid crystal panel is small in size, the liquid crystal is dropped before the sealing material is hardened to form a cell of the liquid crystal panel, and thus comes into contact with the sealing material, thereby causing a leak phenomenon that flows out of the liquid crystal panel.

That is, FIGS. 4A to 4C are cross-sectional views illustrating a problem when a conventional small liquid crystal display device is manufactured by a liquid crystal dropping method.

As shown in FIG. 4A, the first substrate 10 on which the liquid crystal 2 is dropped and the second substrate 20 on which the sealing material 3 is formed are prepared, and the second substrate is inverted. When the 1st and 2nd board | substrates adhere | attach, since the liquid crystal panel is small, the said dropped liquid crystal moves and comes into contact with the said sealing material 3 before the said sealing material 3 hardens. Therefore, since the adhesive force between the sealing material 3 and the substrate falls and Celsium is not maintained, the liquid crystal 3 flows out of the panel to cause a defect.

Second, when the liquid crystal panel is small, the small fluctuation of the liquid crystal dropping affects the cell phone of the liquid crystal panel, and the fluctuation of the cell phone in the liquid crystal panel not only changes the characteristic value of the liquid crystal panel but also affects the outer portion of the sealing material. It will cause a defect.

That is, FIGS. 5A to 5B are cross-sectional views for explaining a problem of cell shelving caused by a variation in the amount of liquid crystal dropped when a conventional small liquid crystal display is manufactured by a liquid crystal dropping method.

When the liquid crystal is dropped in a normal amount (FIG. 5A) and when the liquid crystal is dripped too much (FIG. 5B), the difference between the cells is generated in the liquid crystal panel. When the liquid crystal panel is large in size, when the difference in the amount of liquid crystals dropped is small, the cell size of the liquid crystal panel does not show a great difference. However, when the liquid crystal panel is small in size, the small difference in liquid crystal panel affects the cell difference.

The present invention has been made to solve the above problems, it is arranged to have a connection path between the adjacent liquid crystal panel to prevent the rapid movement of the liquid crystal to prevent liquid crystal leakage and to secure the margin for the liquid crystal fluctuations to prevent cell fluctuations It is an object of the present invention to provide a liquid crystal display and a manufacturing method which can be performed.

The liquid crystal display device of the liquid crystal dropping method according to the present invention for achieving the above object, the connection path between the first substrate and the second substrate on which a plurality of liquid crystal panel region is designed, and the at least two adjacent liquid crystal panel region It is characterized in that it comprises a sealing material formed on the edge of the liquid crystal panel region between the first and second substrate to have a.

Here, the connecting passage is removed in a subsequent process and sealed by the sealing material in the removed connecting passage.

In addition, the manufacturing method of the liquid crystal display device according to the present invention for achieving the above object comprises the steps of preparing a first substrate and a second substrate is designed a plurality of liquid crystal panel region, and the first substrate or the second substrate Dropping liquid crystal into each liquid crystal panel region of the substrate; forming a sealing material at an edge of the liquid crystal panel region of the first substrate or the second substrate to have a connection passage between the at least two neighboring liquid crystal panel regions; And bonding the first substrate and the second substrate so that the surfaces on which the seal material and the liquid crystal are formed face each other, and cutting the bonded substrate by each liquid crystal panel unit so that the connection passage is separated. It has its features.

The method may further include sealing a portion corresponding to the connection passage with a sealing material after cutting each of the liquid crystal panel units.                     

A liquid crystal display device and a manufacturing method of the liquid crystal dropping method according to the present invention having such a feature will be described in more detail with reference to the accompanying drawings.

6 is a layout view of a liquid crystal panel according to the present invention, FIG. 7 is a cross-sectional view taken along line II-II 'of FIG. 6, and FIG. 8 is a cross-sectional view taken along line III-III ′ of FIG. 6.

As described above, the present invention is to prevent liquid crystal leakage and to secure a margin due to fluctuation of the liquid crystal amount when the small liquid crystal display device is manufactured by the liquid crystal dropping method, as shown in FIGS. 6 to 8. Similarly, the liquid crystals are designed to move adjacent liquid crystal panel regions to each other.

Therefore, the remaining part is the same as the conventional one, but the pattern of the sealing material is formed so as to be connected to the adjacent liquid crystal panel region.

That is, the plurality of liquid crystal panel regions 1a and 1b are designed on the substrate, but the sealing member 3 is provided to have a connection passage 7 between the first liquid crystal panel region 1a and the second liquid crystal panel region 1b. Form.

Referring to the manufacturing method of the liquid crystal display according to the present invention having such a structure as follows.

9A to 9E are cross-sectional views of the liquid crystal display device of the liquid crystal dropping method according to the present invention.

First, instead of forming one liquid crystal panel on one glass substrate, as shown in FIG. 6, the plurality of liquid crystal panels 1a and 1b are disposed on the substrate 10 or 20 larger than the size of the unit liquid crystal panel. Design.                     

That is, a thin film transistor array (TFT-array) (not shown) is formed in each liquid crystal panel 1 region of the first substrate, and the color filter array C is formed in each liquid crystal panel 1 region of the second substrate. / F array) (not shown). At this time, a column spacer (patterned spacer) (not shown) is formed on the second substrate after the color filter array is formed to uniformly hold the selves after the bonding of the first and second substrates. do.

And after forming the alignment film for orienting a liquid crystal in each said 1st, 2nd board | substrate and rubbing the said alignment film, the said 1st, 2nd mother substrate is wash | cleaned, respectively.

As shown in FIG. 9A, an appropriate amount of liquid crystal 2 is dropped in each liquid crystal panel 1 region of the first substrate 10. At this time, it is preferable that the liquid crystal 2 is dropped in the center portion of each liquid crystal panel 1 and the liquid crystal does not come into contact with the sealing material until the sealing material is completely cured to maintain the cell.

Then, the sealing material 3 and the Ag dot 4 are dispensed at the edge of each liquid crystal panel 1 region of the second substrate 20. At this time, as shown in FIG. 6, the sealing material 3 has a sealing material 3 so as to have a connection passage 7 between the first liquid crystal panel region 1a and the second liquid crystal panel region 1b. To form.

6 illustrates that the sealing member 3 is formed to have a connection passage between two adjacent liquid crystal panel regions, but the present invention is not limited thereto, and the sealing member 3 may have a connection passage between three or more neighboring liquid crystal panel regions. ) May be formed.

In addition, the sealing material 3 and the liquid crystal 2 may be formed on the first substrate 10 as described above, and the liquid crystal 2 may be dropped on the second substrate 20. All may be formed in the first substrate 10 or in the second substrate 20.

The first and second substrates 10 and 20 formed as described above are placed into a vacuum bonding chamber (not shown) and then the two substrates are bonded.

That is, the second substrate 20 is inverted so that the sealing material 3 faces downward, and is positioned on an upper stage (not shown) of the vacuum adhering chamber, and the liquid crystal 2 is dropped. The first substrate 10 is placed in a lower stage (not shown in the figure) of the vacuum adapter chamber.

Then, the inside of the vacuum adapter chamber is kept in a vacuum state, and the first and second substrates 10 and 20 are brought into close proximity and bonded together as shown in FIG. 9B. At this time, it is preferable that the dropped liquid crystal 2 does not move to the sealing material 3.

The first and second substrates 10 and 20 bonded as described above are loaded from the vacuum adapter chamber into a UV curing furnace (not shown) to cure the sealing material using UV in a UV curing furnace. The UV cured substrate is loaded into a thermal curing furnace to thermally cure the sealing material 3. At this time, the liquid crystal dropped on each liquid crystal panel starts to move, and when the liquid crystal is excessively dropped, the connection passage 7 (buffer) formed in the neighboring first and second liquid crystal panel regions 1a and 1b. Liquid crystal moves to the region). Therefore, even if the amount of liquid crystal dropped is small, there is no fluctuation of the cell 겝, and since the liquid crystal moves to the connecting passage 7, the liquid crystal 2 can be moved and the contact time with the sealing material 3 can be increased. It can prevent.                     

When the UV and thermal curing processes are completed as described above, as illustrated in FIG. 9D, the first and second substrates 10 and 20 are cut per unit liquid crystal panel. At this time, the portion corresponding to the connection passage 7 is cut to be separated separately.

As shown in Fig. 9E, the portion corresponding to the connection passage 7 is sealed with the sealing material 3a, as the liquid crystal injection port is sealed with the sealing material in the conventional liquid crystal injection method.

In addition, after the polishing process for each liquid crystal panel, it is shipped through the inspection process.

As described above, the liquid crystal display and the manufacturing method according to the present invention have the following effects.

First, when a liquid crystal display is manufactured by designing a plurality of liquid crystal panels on one substrate and forming a liquid crystal display device, a sealing material pattern is formed to have a connection passage between neighboring liquid crystal panel regions so that the dropped liquid crystal is bonded after the substrates are bonded. Since it can move naturally through the passage, even if the liquid crystal panel is small, the space for moving the liquid crystal becomes wider, which prevents the liquid crystal leaking out of the panel by contacting the liquid crystal and the sealing material before the sealing material is cured. have.

Second, even when the amount of liquid crystal drop is excessive, the dropped liquid crystal naturally moves and buffers the connection path, thereby ensuring a liquid crystal drop margin.

Claims (5)

delete delete Preparing a first substrate and a second substrate on which a plurality of liquid crystal panel regions are designed; Dropping liquid crystal onto each liquid crystal panel region of the first substrate or the second substrate; Forming a sealing material at an edge of the liquid crystal panel region of the first substrate or the second substrate to have a connection passage between the at least two neighboring liquid crystal panel regions; Bonding the first substrate and the second substrate to face the surface on which the sealing material and the liquid crystal are formed; And And cutting the bonded substrate into units of each liquid crystal panel such that the connection passages are separated from each other. The method of claim 3, wherein After cutting to each liquid crystal panel unit, And sealing the portion corresponding to the connection passage with a sealing material. The method of claim 3, wherein Before cutting to each liquid crystal panel unit, And hardening the sealing material.

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