KR20020010210A - liquid crystal display and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A liquid crystal display and a method of fabricating the liquid crystal display are provided to prevent upper and lower substrate of the liquid crystal display from being misaligned with each other. CONSTITUTION: A liquid crystal display includes the first substrate(210), the second substrate(110) opposite to the first substrate, and a sealant mixed with spacers(260) for sealing up the first and second substrates. The first protrusion(211) and the second protrusion are respectively formed at portions of the first and second substrate where the sealant is formed. The first substrate includes a color filter(230) and a black matrix(220), and the first protrusion is formed of the same material of the color filter or the black matrix. The second protrusion is configured of a gate insulating layer(130) and a protection layer(170) formed on the second substrate.

Description

Liquid crystal display and manufacturing method thereof

The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly, to a liquid crystal display device and a manufacturing method thereof for preventing misalignment of the liquid crystal display device.

In general, a liquid crystal display device injects a liquid crystal material between an upper substrate on which a common electrode, a color filter, and the like are formed, and a lower substrate on which a thin film transistor and a pixel electrode are formed. By applying a different potential to form an electric field to change the arrangement of the liquid crystal molecules, and through this to control the light transmittance is a device that represents the image.

As such, since the liquid crystal display includes two substrates, a process of manufacturing and disposing the upper and lower substrates, respectively, is required. In the process of disposing the two substrates, misalignment occurs.

This misalignment not only acts as a limiting condition in designing the liquid crystal display device but also leads to a reduction in aperture ratio. Therefore, various methods have been attempted to prevent this problem, but there are problems in that it is expensive and difficult to process.

An object of the present invention is to prevent misalignment of upper and lower substrates of a liquid crystal display.

1 is a cross-sectional view illustrating a state in which upper and lower substrates are disposed in a liquid crystal display according to an exemplary embodiment of the present invention.

2 illustrates a manufacturing process of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.

4 to 8 are cross-sectional views illustrating a process of manufacturing a liquid crystal display device according to a first embodiment of the present invention.

9 is a cross-sectional view of a liquid crystal display according to a second exemplary embodiment of the present invention.

10 is a cross-sectional view of a liquid crystal display according to a third exemplary embodiment of the present invention.

11 and 12 illustrate the shape of the projection according to the embodiment of the present invention.

In order to solve this problem, in the present invention, protrusions are formed on the first and second substrates at the position where the sealant is to be printed.

In the liquid crystal display according to the present invention, the first substrate and the second substrate face each other, and the first and second substrates seal the first and second substrates and have a sealant mixed with the spacer. First and second projections are formed on the first and second substrates at the positions.

Here, the first substrate may include a color filter and a black matrix, and the first protrusion may be made of a material such as a color filter or a black matrix.

In addition, a gate wiring is formed on the inner side of the second substrate, a gate insulating film covers the gate wiring, and a semiconductor layer pattern is formed on the gate insulating film. The data line is formed on the semiconductor layer pattern, the data line is covered with a protective film, and a first electrode is formed on the protective film, wherein the second protrusion may include a gate insulating film and a protective film.

In addition, a 2nd protrusion can also be formed by shaving a 2nd board | substrate.

In another exemplary embodiment, the first protrusion may be formed by cutting the first substrate, and the second protrusion may be formed of a gate insulating film and a protective film. Alternatively, the second protrusion may be formed by shaving the second substrate.

In the present invention, the shape of the first and second protrusions may be formed in a grid shape or a tile shape.

The width of the first and second protrusions may be 5 to 10 μm, the interval between the first protrusions and the interval between the second protrusions may be 5 to 10 μm.

On the other hand, the size of the spacer may be 4 to 10 ㎛.

In addition, the inclination of the first and second projections is preferably 45 degrees to 85 degrees.

In the method of manufacturing the liquid crystal display according to the exemplary embodiment of the present invention, a gate wiring is formed on the first substrate, a gate insulating film covering the gate wiring is formed, and then a semiconductor layer is formed. Subsequently, a data line is formed over the semiconductor layer and a protective film covering the data line is formed. Next, a first electrode to which an image signal is applied from the data line is formed on the protective film. Next, a black matrix is formed on the second substrate and a color filter is formed at a position defined by the black matrix, and then a second electrode covering the color filter is formed. Subsequently, an encapsulant comprising a spacer is printed on either the first or second substrate and placed so as to face the first and second substrates. At this time, the first and second substrates to include the first and second projections, respectively, in the portion where the sealant is printed.

Here, the first protrusion may be made of a material such as a color filter or a black matrix, and the second protrusion may be made of a gate insulating film and a protective film.

Alternatively, the second protrusion may be made of a second substrate, wherein the formation of the second protrusion may use HF and ultrapure water.

Meanwhile, the first protrusion may be formed by shaving the first substrate, and the second protrusion may be formed by shaving the second substrate. In this case, the formation of the first protrusion and the second protrusion may use HF and ultrapure water.

When the first protrusion is formed as the first substrate, the second protrusion may be formed of a gate insulating film and a protective film.

In the present invention, the shape of the first and second protrusions may be formed in a grid shape or a tile shape.

The width of the first and second protrusions may be 5 to 10 μm, and the interval between the first and second protrusions may be 5 to 10 μm, and the inclination of the first and second protrusions may be 45 degrees to 85 degrees. have.

Here, the size of the spacer may be 4 to 10 ㎛.

As described above, in the present invention, protrusions are formed at the position at which the encapsulant is to be printed so that the spacers are positioned between the protrusions so that they do not slip when the two substrates of the liquid crystal display are disposed. Therefore, misalignment can be prevented from occurring.

Next, a liquid crystal display and a manufacturing method thereof according to the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional view illustrating a state in which upper and lower substrates are disposed in a liquid crystal display according to an exemplary embodiment of the present invention.

As shown in FIG. 1, one of two substrates of the liquid crystal display is a thin film transistor substrate 1 and the other is a substrate 4 (hereinafter referred to as a color filter substrate) including a color filter. In general, the thin film transistor substrate 1 is disposed below and the color filter substrate 4 is disposed above. Field generating electrodes 2 and 5 are formed on the inner surfaces of the two substrates 1 and 4, and alignment layers 3 and 6 are formed thereon, and each alignment layer 3 and 6 is rubbed in a predetermined direction. have. Liquid crystal molecules 7 are inserted between the alignment layers 3 and 6, and polarizing plates 8 and 9 are attached to the outer surface of each substrate, and the polarization axes of the polarizing plates 8 and 9 are arranged to be perpendicular to each other.

FIG. 2 illustrates a process of forming a liquid crystal cell among manufacturing processes of the liquid crystal display.

First, a sealant, which is a thermosetting resin, is printed on one of two substrates, for example, a color filter substrate, which is to bond two substrates while maintaining a constant gap. At this time, in order to precisely and uniformly space the gap between the two substrates, a spacer of a certain size is mixed with a sealant and printed. Next, the assembly process is performed by matching the pixel electrodes of the thin film transistor substrate with the color filters of the color filter substrate, and performing a hot press. Next, a process of injecting liquid crystal molecules between the two substrates and sealing the injection hole is performed.

3 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention formed through such a process, and FIGS. 4 to 8 illustrate a process of manufacturing a thin film transistor substrate of a liquid crystal display device according to a first embodiment of the present invention. It is a cross-sectional view showing.

As shown in FIG. 3, the liquid crystal display according to the present invention is divided into a pixel portion A and a peripheral portion B, and a gate electrode 121 of a thin film transistor is formed on the lower substrate 110 of the pixel portion A. FIG. And a gate insulating film 130 is formed thereon. The semiconductor layer pattern 141 is formed on the gate insulating layer 130, and the contact layer patterns 151 and 152 are formed thereon. On the contact layer patterns 151 and 152, a source electrode 161 connected to a data line (not shown), and a drain electrode 162 are formed opposite the source electrode 161 around the gate electrode 121. . The source electrode 161 and the drain electrode 162 are covered with the passivation layer 170, and the contact hole 171 exposing the drain electrode 162 is formed in the passivation layer 170. The pixel electrode 180 is formed on the passivation layer 170, and the pixel electrode 180 is connected to the drain electrode 162 through the contact hole 171.

Meanwhile, a black matrix 220 made of an opaque material such as a metal is formed on the upper substrate 210 of the pixel portion A, and the color filter 230 is disposed at a position corresponding to the pixel electrode 180 thereon. Formed. The common electrode 240 made of a transparent conductive material is formed on the black matrix 220 and the color filter 230.

Although not shown, an alignment layer is formed on the electrodes 240 and 180 of the upper and lower substrates 210 and 110, respectively.

Next, in the peripheral portion B of the liquid crystal display according to the first exemplary embodiment of the present invention, a protrusion 190 including a gate insulating layer 130 and a passivation layer 170 is formed on the lower substrate 110, and the upper substrate ( A protrusion 250 formed of the same material as the color filter 230 is formed in the 210, and the protrusions 190 and 250 are formed at positions facing each other. The width of the protrusions 190 and 250 is 5 to 10 μm, and the interval between the protrusions 190 and 250 is also about 5 to 10 μm. Meanwhile, the depths of the protrusions 190 and 250 may be smaller than about 1 μm in the case of the lower substrate 110, and may be about 2 to 3 μm in the case of the upper substrate 210.

The spacer 260 is positioned between the protrusions 190 and 250, and the size of the spacer 260 may be 4 to 10 μm.

In the present invention, the inclination of the protrusions 190 and 250 is 45 degrees to 85 degrees so that the spacer 260 is easily stuck between the protrusions 190 and 250 and does not slip well.

In addition, the protrusion 250 of the upper substrate 210 may be formed using only the color filter 230 material, but may also be formed together with the black matrix 220 material, or the protrusion 250 may be formed using only the black matrix 220 material. It may be.

Next, a thin film transistor substrate manufacturing method of the liquid crystal display according to the first exemplary embodiment of the present invention will be described with reference to FIGS. 4 to 8.

First, as shown in FIG. 4, the gate electrode 121 is formed on the substrate 110.

Next, as illustrated in FIG. 5, the gate insulating layer 130, the semiconductor layer, and the ohmic contact layer are deposited and patterned to form the contact layer pattern 153 and the semiconductor layer pattern 140.

Next, as shown in FIG. 6, a material such as a metal is deposited and patterned to form a source electrode 161 and a drain electrode 162 opposite to the source electrode 161, and the exposed contact layer pattern 153 is etched and contacted. The layer patterns 151 and 152 are completed.

Next, as shown in FIG. 7, the protective layer 170 is deposited and etched together with the gate insulating layer 130 to form a contact hole 171 and a protrusion 190 exposing the drain electrode 162.

Subsequently, as illustrated in FIG. 8, the pixel electrode 180 connected to the drain electrode 162 is formed through the contact hole 171.

As described above, in the present invention, the protrusions 190 and 250 are formed in the peripheral portion B so that the spacer 260 is positioned between the protrusions 190 and 250 to prevent slippage when the upper and lower substrates 210 and 110 are disposed. It can prevent and prevent misalignment.

In the first embodiment of the present invention, the protrusions are formed of the gate insulating film, the protective film, and the color filter or the black matrix material, but the protrusions may be formed by etching the substrate itself.

9 is a cross-sectional view of the liquid crystal display according to the second exemplary embodiment of the present invention.

As shown in FIG. 10, in the second embodiment of the present invention, the pixel portion A forms upper and lower substrates 210 and 110 in the same manner as the first embodiment. 111 is formed by partially removing the upper and lower substrates 210 and 110, respectively. At this time, there are various methods of forming the projections 211 and 111, and there are methods of digging a groove using a laser or using HF. Here, the method using the HF is better in that the projections 211 and 111 of the upper and lower substrates 210 and 110 are arranged without shifting each other. In this case, before the thin film is formed on the upper and lower substrates 210 and 110, the damage may be performed.

The method of forming the protrusions on the liquid crystal display using HF is as follows.

First, the mask having the pattern formed at the position where the suture is to be applied is placed and the HF is dropped to remove the exposed portion, thereby forming the protrusions 211, followed by washing with deionized water to remove the HF.

At this time, the pattern of the projection 211 can form a variety of shapes, as shown in Figure 10 may be formed in a grid shape or a tile shape as shown in FIG.

12 is a cross-sectional view of a liquid crystal display according to a third exemplary embodiment of the present invention, in which the pixel portion A forms upper and lower substrates 210 and 110 as in the first exemplary embodiment, and the peripheral portion B The protrusion 190 is formed on the lower substrate 110 of the upper substrate 210 using the gate insulating layer 130 and the passivation layer 170 as in the first embodiment, but the protrusion 211 of the upper substrate 210 is formed by using the HF. It is formed by removing a part of the substrate 210.

As described above, in the present invention, the protrusions are formed at the position where the encapsulant is applied so that the spacers are positioned between the protrusions so that the two substrates do not slip.

In the present invention, protrusions are formed at positions where the adhesives of the upper and lower substrates of the liquid crystal display are to be applied, and the spacers are positioned between the protrusions, thereby preventing misalignment during the arrangement of the upper and lower substrates.

Claims (28)

First substrate, A second substrate facing the first substrate, An encapsulant encapsulating the first and second substrates and mixed with a spacer. Including; And first and second protrusions respectively formed on the first and second substrates at positions where the encapsulant is formed. In claim 1, The first substrate includes a color filter and a black matrix, and the first protrusion is made of the same material as the color filter or the black matrix. In claim 2, The second substrate is a gate wiring formed on the inner surface, A gate insulating film covering the gate wiring, A semiconductor layer pattern on the gate insulating layer, A data line on the semiconductor layer pattern; A protective film covering the data wiring, A first electrode formed on the passivation layer; And the second protrusion is formed of the gate insulating film and the protective film. In claim 2, And the second protrusion is formed by cutting off the second substrate. In claim 1, And the first protrusion is formed of the first substrate. In claim 5, The second substrate is a gate wiring formed on the inner surface, A gate insulating film covering the gate wiring, A semiconductor layer pattern on the gate insulating layer, A data line on the semiconductor layer pattern; A protective film covering the data wiring, A first electrode formed on the passivation layer; And a second protrusion is formed of the gate insulating film and the protective film. In claim 5, And the second protrusion is formed of the second substrate. In claim 1, The first and second protrusions have a lattice shape. In claim 1, The first and second protrusions may have a tile shape. In claim 1, The first and second protrusions have a width of 5 to 10 μm. In claim 10, An interval between the first protrusions and an interval between the second protrusions are 5 to 10 μm. In claim 11, The spacer has a size of 4 to 10 ㎛. In claim 1, The inclination of the first and second protrusions is 45 to 85 degrees liquid crystal display device. Forming a gate wiring on the first substrate, Forming a gate insulating film covering the gate wiring; Forming a semiconductor layer, Forming a data line on the semiconductor layer; Forming a protective film covering the data line; Forming a first electrode on the passivation layer to receive an image signal from the data line; Forming a black matrix on the second substrate, Forming a color filter at a location defined by the black matrix, Forming a second electrode covering the color filter Including; Printing an encapsulant comprising a spacer on either the first or second substrate, Placing the first and second substrates to face each other; More, And the first and second substrates include first and second protrusions respectively formed at portions where the encapsulant is printed. The method of claim 14, And the first protrusion is made of a material such as the color filter or the black matrix. The method of claim 15, And the second protrusion is formed of the gate insulating film and the protective film. The method of claim 15, And the second protrusion is formed by shaving the second substrate. The method of claim 17, The second protrusion is formed using HF and ultrapure water. The method of claim 14, And the first protrusion is formed by shaping the first substrate. The method of claim 19, And the second protrusion is formed by shaving the second substrate. The method of claim 20, The formation of the first and second protrusions uses a HF and ultrapure water. The method of claim 19, And the second protrusion is formed of the gate insulating film and the protective film. The method of claim 14, The first and second protrusions have a lattice shape. The method of claim 14, The first and second protrusions may have a tile shape. The method of claim 14, The first and second protrusions have a width of 5 to 10 μm. The method of claim 25, An interval between the first and second protrusions is 5 to 10 ㎛. The method of claim 26, The spacer has a size of 4 to 10 ㎛. The method of claim 14, The inclination of the first and second protrusions is 45 to 85 degrees liquid crystal display device.