KR100223157B1 - Large area lcd and method for manufacturing the same - Google Patents

Abstract

The large-area liquid crystal display device of the present invention is formed up to the edge portion of the upper side and the lower side of the color filter and pixel electrode, and the seals printed on the side of the upper and lower edges of the pixel line and the pixel line Each small liquid crystal panel is formed by printing on the boundary area, that is, the boundary area of the color filter and the color filter, and injecting a male liquid crystal in which the upper plate and the lower plate are bonded together, and attaching the small liquid crystal panel on the base substrate. It is possible to realize high quality by injecting liquid crystal into the pixel area where the liquid crystal of the pasted part is not injected and to construct a large area liquid crystal display device, and to omit the process of separately processing the substrate surface to be bonded separately. It is more advantageous in terms of equipment and yield than manufacturing a large area liquid crystal display using a large glass substrate.

Description

A manufacturing method of a large area liquid crystal display device and a large area liquid crystal display device manufactured by the method.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a large area screen, and more particularly, to a liquid crystal display device having a large area screen in which a plurality of small liquid crystal panels are connected on the same plane.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a liquid crystal display device having a high-quality large-area screen by preventing the joint portion of the attached liquid crystal panel from being observed, and a liquid crystal display device thereof.

Another object is to provide a manufacturing method for simplifying the processing of the surface of the pasted liquid crystal panel.

LCD displays are used almost everywhere, from offices, schools, libraries, and even homes. As described above, as the range of use of the liquid crystal display device is widened, development of an application product utilizing excellent characteristics of viewing a light, thin, and high-quality screen for a long time is progressing.

The liquid crystal display device is light and thin, so that its portability is convenient and it is used even in a harsh environment so that it can be mounted in a car or an airplane.

Some specific applications are used in portable information communication devices such as personal computers, audio visual (AV) and mobile computers, games and simulation devices.

As described above, liquid crystal display devices used in various fields have also been developed to be enlarged to be used as large TVs or guide displays in public places, that is, large museums, railway stations, or airports.

The present invention relates to a liquid crystal display device having the large area, and the method for configuring the large area liquid crystal display device can be largely divided into two types.

First is Magnascreen's large-area liquid crystal display, or Sharp, published in 1993 (N.Mazurek, T.Zammit, R.Blose's A 51-in. There is a method of constructing a large area liquid crystal display device by constructing each small liquid crystal panel, such as a large area liquid crystal display device published by LCD International in 1995, and then connecting the small liquid crystal panels.

As described above, as shown in FIG. 1, small liquid crystal panels (5 inches or 10 inches) of 1a, 1b, 1c, and 1d are separately manufactured and then fixed to the base substrate 1 to manufacture a large area liquid crystal display device. It is.

The structure of the large-area liquid crystal display can be more easily understood by referring to FIG. 2, which is cut along the line II-II of FIG.

In FIG. 2, the small liquid crystal panels 1a and 1b each have an upper plate 30 having color filters R (Red) and G (Green) formed therebetween, and a lower plate 31 having pixel electrodes 25 formed therebetween. .

The liquid crystal 40 is filled in the space formed by the seal 10, that is, the cell gap.

In the large-area liquid crystal display device formed as described above, since the seal is formed in two lines on the portion A to be bonded, the width of the liquid crystal display is widened, so that the portion to be bonded is easily observed.

Therefore, in order to prevent the bonded surface from being observed by the eyes, as shown in FIG. 3, a small liquid crystal panel is manufactured, and a method of cutting and grinding up to the C line portion and then attaching the bonded surface is widely used.

However, the large-area liquid crystal display device manufactured by the above method, when cutting or grinding the joining surface, due to the work process error, the seal having a narrow width of several tens to several hundreds of micrometers bursts and the liquid crystal leaks. The defect which becomes is caused. Therefore, there is a limitation in manufacturing technology to manufacture a high-quality large-area liquid crystal display in which the surface joined by the above method is not observed.

Second, a large glass substrate was formed by attaching a small glass substrate, such as a paper presented by APEX, Korea (large area liquid crystal display realized by tiling of four back panels, 95 ASIA DISPLAY). There is a method of constructing a large area liquid crystal display device using the large area glass substrate.

Such a manufacturing method is proposed because there is a limit in producing a single glass substrate of 20 inches or more with the current technology.

First, the edges of small glass substrates (5 inches) 2a, 2b, 2c, and 2d as shown in FIGS. 4 and 5 (cross section taken along the line V-V of FIG. 4) are precisely processed and attached to the base substrate No. 1.

The boundary A of the small glass substrate attached to the base substrate 1 has an error within 5 μm, and the surface step B between the small glass substrate and the substrate has an error within 0.3 μm.

In order to attach the small glass substrate to the base substrate within the above error, ultra fine glass processing technology is required, and the flatness of the small glass substrates must be adjusted by using a ball 170 made of a fine and transparent resin.

As described above, by attaching a small glass substrate on the base substrate by a microfabrication technique, one large area glass substrate can be obtained.

6 and 7 illustrate the configuration of a liquid crystal display using the large-area glass substrate.

The large-area liquid crystal display device 100 of FIG. 6 is cut along the line VII-VII to form the structure of FIG.

In order to avoid complicated drawings, illustration of pixel electrodes, color filters, transparent resin balls, and the like are omitted.

The base substrate 1 to which the small glass substrate is attached as described above is bonded to each other with the seal 10 therebetween, and the liquid crystal 40 is injected to complete the large-area liquid crystal display device 100.

However, the liquid crystal display device manufactured as described above is inferior in stability to the liquid crystal injection process because liquid crystal is injected in a single process in a large area.

In addition, as the substrate becomes larger, it is necessary to replace the production equipment to cope with the manufacturing process of the large-area LCD.

As mentioned above, the manufacturing method of the conventional large area liquid crystal display device was examined and the subject which this invention should solve is demonstrated below.

As described above with reference to FIGS. 1, 2, and 3, in order to attach the small liquid crystal panel, the surface to be pasted must be cut or ground.

This is for manufacturing a high-quality liquid crystal display device by preventing the attached surface from being observed by the eyes when the large liquid crystal display device is driven.

However, manufacturing a large-area liquid crystal display device by the above method requires a cumbersome cutting process or a grinding process, and also causes a problem in that liquid crystals are leaked due to bursting of seals in the process.

In addition, as shown in FIGS. 4, 5, 6, and 7, a small glass substrate is subjected to ultra-fine processing to form a large-area glass substrate, and then a liquid crystal display device is manufactured in the liquid crystal injection process. The injection of liquid crystal is unstable, and additional production equipment suitable for large area glass substrates is required in the process.

In particular, the thickness of the glass substrate tends to decrease from 1 mm to 0.7 mm. In addition, if the glass substrate has a large area, the glass substrate is bent like a bow just by holding the end of the glass substrate. It becomes very difficult.

In addition, since the apparatus for rotating the glass substrate at high speed is required in the process of forming the color filter, the equipment must be enlarged to fit the above.

It is an essential aspect of the present invention to provide a method for manufacturing a large-area liquid crystal display device that can solve all the above problems, and the structure of the liquid crystal display device is shown in FIGS. 8 and 9 (IX in FIG. 8). Section taken along line IX).

In the liquid crystal display device having the above structure, the color filter of the upper and lower plates and the edge portion of the surface where the pixel electrodes are joined to each other are formed, and the seal 110 printed on the surface of the bonding surface is formed with the boundary area between the pixel line and the pixel line, that is, the color filter. After printing on the boundary area between the color filter and the color filter, the upper and lower plates are bonded together, and then the liquid crystal is injected into the (A), (B), (C) and (D) parts to respectively attach the small liquid crystal panels 11a, 11b, 11c, and 11d. Configure

After attaching the small liquid crystal panel onto the base substrate 111, the liquid crystal is injected into the pixel (region (F) of FIGS. 8 and 9) where the liquid crystal of the bonded portion is not injected, thereby allowing a large area liquid crystal display device. Configure

The surface of the said pasting board | substrate is bonded by light-shielding resin 45.

In particular, the pixel electrode 125 positioned at the edge of the substrate to be bonded on the bonding surface is formed inside the end of the substrate in order to prevent shorting.

The black matrix 135 is formed between the boundary area of the color filter, that is, between the color filter and the color filter, and the black matrix formed at the home position on the side of the connecting surface is less than 1/2 of the width of the black matrix formed between the color filter and the color filter. Is formed.

By constructing the large-area liquid crystal display device of the present invention through the above process, it is possible to omit the step of separately processing the substrate surface to be bonded separately, and the liquid crystal injection failure does not occur.

In addition, the present invention is more advantageous in terms of production equipment and yield than using a large glass substrate because the small liquid crystal panel is manufactured by using a small glass substrate and then bonded to the small liquid crystal panel.

1 is a plan view of a conventional large area liquid crystal display device,

2 is a cross-sectional view of FIG. 1,

3 is a view for explaining the cross-sectional processing of a conventional small liquid crystal panel,

4 is a plan view of forming a large-area glass substrate by joining small glass substrates,

5 is a cross-sectional view of FIG.

6 is a plan view of a liquid crystal display device fabricated using a conventional bonded large area glass substrate,

7 is a cross-sectional view of FIG. 6,

8 is a plan view of a large-area liquid crystal display device of the present invention,

9 is a cross-sectional view of FIG. 8,

10, 11, 12, and 13 are cross-sectional views for explaining embodiments of the present invention.

* Explanation of symbols for main parts of the drawings

(1,111) Base board

(1a, 1b, 1c, 1d, 11a, 11b, 11c, 11d) Small liquid crystal panel

(2a, 2b, 2c, 2d) Small Glass Substrates (10, 110) Seal

(25, 125) Pixel Electrode (35, 135) Black Matrix

(40, 140) Liquid Crystal (45) Shading Resins

The liquid crystal display device according to the present invention comprises a liquid crystal display including a liquid crystal between the upper plate and the lower plate and a lower plate including a top plate including a color filter formed in a matrix and a pixel electrode formed in a matrix, and a seal formed between the upper and lower plates. In a large-area liquid crystal display device in which a plurality of panels are pasted together, the seal formed on the liquid crystal display device is printed with at least a color filter width on the seam side of the small liquid crystal panel, and the side where the seam is not bonded is colored. And is printed to surround the filter area.

The manufacturing method of the large-area liquid crystal display device according to the present invention having the above characteristics is first manufactured by a small liquid crystal panel, and then a plurality of small liquid crystal panels are spliced together on a plane, and the boundary between the small liquid crystal panels attached thereto. And injecting the liquid crystal into the spaces (pixels are formed) of the upper and lower substrates formed in the portion.

In particular, in the manufacturing process of the small liquid crystal panel, a process of forming a color filter in a matrix form up to the edge portion of the top plate to be bonded, and a process of forming pixel electrodes in a matrix form to the edge portion of the bottom plate to be bonded to the bottom plate And a step of printing a seal so that at least a distance of the width of the color filter is placed on the surface of the substrate to be selected from the upper and lower plates, and the non-bonding side surrounds the area of the color filter. Bonding the substrate so that the pixel electrodes of the upper and lower plates and the color filter are opposed to each other, and injecting the liquid crystal into the space surrounded by the seal.

Hereinafter, a method of manufacturing the liquid crystal display device of the present invention will be described in detail.

An embodiment of the present invention is described as a process of constructing a large area liquid crystal display device by joining four small liquid crystal panels.

First, a small liquid crystal panel is manufactured.

The manufacturing process for the above is as follows.

First, in FIG. 10, a black matrix 135 is formed in a predetermined pattern on the upper plate 130 made of a transparent glass substrate, and color filters R (Red), G (Green), and B (Blue) are formed in a matrix.

Here, the color filter is formed up to the edge portion of the surface to be pasted, the black matrix of the edge portion is formed by patterning to be less than half of the width of the black matrix located in the boundary region of the color filter and the color filter. That is, ① is equal to or less than 1/2 of ②.

Forming a narrow width of ② as described above can prevent the width of the seam from being widened when the small liquid crystal panels are bonded to each other after the small liquid crystal panel is manufactured. To prepare.

In the present embodiment, the width of ② is formed to be 50 µm to 100 µm, and the width of ① is formed to be 25 µm to 50 µm or less.

Subsequently, a common electrode 211 made of an indium tin oxide (ITO) film or the like is formed. When the ITO film is completed, the ITO film serves as a protective film to prevent a chemical reaction that deteriorates the image quality by contacting the liquid crystal with the ionic dye of the color filter in addition to the common electrode.

Subsequently, a seal 110 is printed on the top plate on which the color filter, the black matrix, and the common electrode are formed.

The seal printed on the side to be pasted is printed on the black matrix area of the border of the color filter and the color filter, and the seal printed on the non-stitched side is printed on the black matrix area to surround the area where the color filter is formed.

The seal width is less than 50㎛ ~ 100㎛ to be smaller than the width of the black matrix between the color filter and the color filter.

In addition, at 11, the pixel electrode 125 connected to the switching element is formed in a matrix on the lower plate 131 made of a transparent glass substrate.

Since the pixel electrode must be patterned to face the color filter of the upper plate 130, the pixel electrode on the side of the surface to be bonded is formed up to the edge portion of the surface of the surface to be bonded together with the color filter of the upper plate.

When the upper plate 130 and the lower plate 131 are configured as described above, the upper and lower plates are bonded as shown in FIG. 12, and then liquid crystals 140 are injected and sealed in a gap formed by a seal.

Through the above process, the small liquid crystal panels 11a, 11b, 11c, and 11d of FIG. 8 are manufactured, respectively.

In the small liquid crystal panel of this embodiment, although the seal and the black matrix are formed on the upper plate, the black matrix is formed in the boundary region of the pixel electrode and the pixel electrode on the lower plate 131 as shown in FIG. Does not affect

When the small liquid crystal panel completed as described above is pasted together in a plane, FIG. 8 is in a state of 3 9 (cross section taken along line IX-IX in FIG. 8).

Hereinafter, a manufacturing process of joining the small liquid crystal panel will be described in detail.

After arranging the small liquid crystal panels 11a, 11b, 11c, and 11d on the base substrate 111, each of the light blocking resins 45 is bonded to the interface between the upper and lower surfaces of the small liquid crystal panel.

The small liquid crystal panel to which the light-shielding resin is adhered is fixed to the base substrate 111, and after the liquid crystal is injected into the portion F which has not yet been injected, the liquid crystal injection holes 210a, 210b, 210c, and 210d are sealed to complete a large area liquid crystal display device. (FIG. 8, FIG. 9).

When the large-area liquid crystal display device is manufactured as described above, the width ③ of the seam portion of FIG. 8 is formed to be almost the same as the width? Between the color filter and the color filter.

That is, even if the small liquid crystal panel is bonded together, the bonded portion is not observed by the eye, and a high quality liquid crystal display device can be manufactured.

In the conventional liquid crystal display device, as described with reference to FIGS. 1, 2, and 3, the surface to be bonded must be cut or ground in order to attach the small liquid crystal panel.

However, manufacturing a large-area liquid crystal display device by the above method requires a cumbersome cutting process or a grinding process, and also causes a problem in that the liquid is leaked due to the explosion of the seal.

In the conventional liquid crystal display device, as shown in FIGS. 4, 5, 6, and 7, a small glass substrate is subjected to ultra-fine processing, and a plurality of glass substrates are formed to form a large-area glass substrate. In the liquid crystal injection process, the liquid crystal injection is unstable, that is, the liquid crystal density of the cell gap is not uniform, and additional production equipment suitable for the large-area glass substrate is required in the process.

In order to solve the above problems, the liquid crystal display device of the present invention prints the seal printed on the side of the connecting surface on the boundary area of the pixel line and the pixel line, that is, the boundary area of the color filter and the color filter, and the top plate and the bottom plate. After bonding, liquid crystal is injected to form each of the small liquid crystal panels.

After attaching the small liquid crystal panel on the base substrate, a liquid crystal is injected into a pixel in which no liquid crystal is injected to form a large area liquid crystal display device.

The liquid crystal display of the present invention configured through the above process can omit the process of separately processing the substrate surface to be pasted separately, and the surface of the pasted surface is not visible to the eye and no liquid crystal injection defect occurs. .

In addition, according to the present invention, since a small liquid crystal panel is manufactured using a small glass substrate, the small liquid crystal panel is pasted together, and thus, a more advantageous effect can be obtained in terms of production equipment and yield than using a large glass substrate. .

Claims (20)

A method of manufacturing a large-area liquid crystal display device by pasting a plurality of small liquid crystal panels together; Forming a color filter in a matrix on the top plate; Forming a pixel electrode on a lower plate in a matrix; Printing a seal so that at least a distance of the width of the color filter is placed on the surface of the substrate to be selected from the upper and lower plates, and the non-bonding side surrounds an area of the color filter; Bonding the plate to face the pixel electrodes of the upper and lower plates and the color filter to face the seal; Producing the small liquid crystal panel comprising the step of injecting liquid crystal into the space surrounded by the seal, Attaching a plurality of small liquid crystal panels prepared in the above step on a plane; A method of manufacturing a large-area liquid crystal display device comprising the step of injecting liquid crystal into the space between the upper and lower substrate formed on the boundary portion of the small liquid crystal panel attached. The method of claim 1; The color filter and the pixel electrode of the upper and lower plates are formed to the edge portion of the surface side to be bonded to the manufacturing method of the large-area liquid crystal display device. The method of claim 2; And forming a black matrix in a boundary area of the color filter formed in a matrix on the top plate. The method of claim 2; And forming a black matrix in a boundary area of the pixel electrode formed in a matrix on the lower plate. The method of claim 3; And forming a common electrode on the top plate on which the black matrix and the color filter are formed. The method of claim 5; And the seal is printed on the common electrode of the black matrix area of the upper plate. The method of claim 4; And the seal is printed on the black matrix of the lower plate. The method of claim 3 or 4; The width of the black matrix is a manufacturing method of a large area liquid crystal display device, characterized in that 50㎛ ~ 100㎛. The method of claim 6 or 7, And the seal is printed to have a width of 50 μm to 100 μm. The method of claim 1; A method of manufacturing a large-area liquid crystal display device, wherein the boundary portion of the small liquid crystal panel is attached to the light blocking resin. The method of claim 3 or 4; A method of manufacturing a large area liquid crystal display device, characterized in that the width of the black matrix formed at the edge of the surface of the pasted surface is 25 µm to 50 µm. A top plate comprising a color filter formed in a matrix, A lower plate including pixel electrodes formed in a matrix; A seal formed between the upper and lower plates, A large-area liquid crystal display device comprising a plurality of small liquid crystal panels joined together with liquid crystals between the upper and lower plates. The color filter and the pixel electrode of the small liquid crystal panel are formed to the edge portion of the surface side to be bonded, The seal printed between the upper and lower plates of the small liquid crystal panel has at least the distance of the color filter width at the surface where the seam is bonded and surrounds the color filter area at the surface where the seam is not bonded. Display. The method of claim 12; And a black matrix is added to a boundary area of the color filter formed in a matrix on the top plate. The method of claim 12; And a black matrix is added to a boundary area of the pixel electrode formed in a matrix on the lower plate. The method of claim 13; And the seal printed on the bonded surface is located on the black matrix area between the color filter and the color filter. The method of claim 14; And the seal printed on the bonded surface is located on the black matrix area between the pixel electrode and the pixel electrode. The method of claim 13; And a black matrix between the color filter and the color filter is within 50 µm to 100 µm. The seal is a large area liquid crystal display device, characterized in that 50㎛ ~ 100㎛. The method of claim 12; The small liquid crystal panel is a large area liquid crystal display device, characterized in that the connection to the light-shielding resin. The method of claim 13; A large area liquid crystal display device, characterized in that the width of the black matrix formed at the edge of the side of the bonding surface is 25㎛ ~ 50㎛.