KR20060131107A - Liquid crystal display and fabrication method thereof - Google Patents

Abstract

An LCD and a method for manufacturing the same are provided to minimize the variation between films, which occurs during formation of the films, and maintain a uniform cell gap, by forming a hydrophobic film on a color filter substrate and providing spacers above the hydrophobic film. A metal wire(20) is formed on a first substrate(10). A black matrix(70) is formed on a second substrate(60) and covers the metal wire. A hydrophobic film(80) is formed on the black matrix. A color filter is formed in a vacant region of the hydrophobic film. A plurality of spacers(110) are formed above the hydrophobic film. The hydrophobic film gives hydrophobic property to the color filter. A planarization film(100) is supplied between the hydrophobic film and the spacers.

Description

Liquid crystal display and its manufacturing method {Liquid crystal display and fabrication method

1 is a plan view of a conventional liquid crystal display device.

2 is a cross-sectional view taken along line II ′ of FIG. 1.

3 is a plan view of a liquid crystal display device according to the present invention;

4 is a cross-sectional view taken along line III-III 'of FIG. 3;

5A to 5C show a method of forming a hydrophobic film.

6A and 6B show another embodiment of forming a hydrophobic film.

7A to 7E are manufacturing process diagrams of the liquid crystal display of the present invention.

<Description of the reference numerals for the main parts of the drawings>

1: liquid crystal panel 10: second substrate

20 metal wiring 30 insulating film

40: protective film 50: liquid crystal layer

60: first substrate 70: black matrix

80: hydrophobic film 90: color filter

100: planarization film 110: spacer

120: mixed material

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method of manufacturing the same, and more particularly, by providing a hydrophobic film on a color filter substrate to minimize variation occurring during film formation and providing a spacer in a region in which the hydrophobic film is formed. A liquid crystal display device capable of forming a cell gap and a method of manufacturing the same.

In general, a liquid crystal display device includes a liquid crystal panel in which a liquid crystal is interposed between the substrate and the substrate, a drive for driving the liquid crystal panel, a driving circuit portion to which various circuit elements are attached, and a backlight for irradiating light from the back side.

The liquid crystal panel is a direct component for displaying an image on a screen, and the size of the liquid crystal panel is increasing as the demand for large screens increases.

The liquid crystal panel is configured by sandwiching a liquid crystal between two substrates. A side seal is provided at an edge of the two substrates to bond the two substrates together, and the liquid crystal layer is disposed therein to form a liquid crystal layer.

Characteristics required for the liquid crystal panel include high response speed, high contrast ratio, wide viewing angle, and the like. In particular, the response speed and contrast are closely related to the cell spacing of the liquid crystal layer. Therefore, a high contrast ratio cannot be obtained unless the cell gap of the liquid crystal layer is set constant.

In addition, when the thickness of the liquid crystal layer is uneven, display stain occurs, and visibility is reduced. Therefore, the liquid crystal layer must be maintained at a constant thickness to form a uniform screen in screen display.

However, as the screen size increases, there is a limit in keeping the cell gap constant with only the side seal disposed at the edge of the liquid crystal panel due to the load of the substrate and external shocks.

Thus, in order to maintain a constant cell gap between the two substrates, spacers were provided on the entire liquid crystal panel to maintain a uniform cell gap.

1 is a plan view of a conventional liquid crystal display, and FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

As shown in FIG. 1, a liquid crystal display device injects liquid crystal into a predetermined gap between two thin substrates 510 and 560 to form a liquid crystal panel 500, and supplies power thereto to change the arrangement of liquid crystals. It is a display that displays the image by adjusting the contrast by thin film transistor (T) and passing the light through this part.

The liquid crystal panel 500 includes a metal wire 520 for partitioning each pixel; A black matrix 570 corresponding to the metal wiring 520 and covering the pattern of the metal wiring 520; A color filter 590 having a color is formed between the black matrices 570. In addition, a spacer 610 is provided in the black matrix 570 to maintain the cell gap so as not to affect the pixel.

As shown in FIG. 2, the conventional liquid crystal panel 500 includes a lower plate 510 on which a plurality of elements are formed and an upper plate 560 on which a plurality of color filters are provided. The liquid crystal is injected between the two substrates 510 and 560 to form a liquid crystal layer 550 to form a liquid crystal panel 500.

The top plate 560 is provided with a plurality of color filters 590 to express colors. A black matrix 570 is formed at the boundary of the color filter 590 having a plurality of colors to prevent optical interference of adjacent colors.

In addition, a planarization film 600 is provided in the region where the color filter 590 and the black matrix 570 are formed to planarize the step formed by forming the color filter 590 and the black matrix 570.

The color filter 590 may be configured in the form of a stripe, a mosaic, a delta, or the like. The stripe format will be described here as an example. Since the mosaic and the delta type are overlapped and formed on the black matrix 570 to prevent misalignment of the color filter 590, the description will be omitted.

On the other hand, on the lower plate 510, a thin film transistor T capable of changing the molecular arrangement direction of the liquid crystal layer 550 is provided at a position where a plurality of metal wires 520 intersect in a vertical direction and a horizontal direction.

Here, briefly introducing the thin film transistor (T), the thin film transistor (T) is a gate electrode connected to the horizontal gate wiring formed on the lower plate 510; An insulating film 530 of a gate metal formed on the entire surface of the substrate together with the gate wiring; A semiconductor layer comprising an active layer and an ohmic contact layer sequentially formed on the gate insulating film 530 including the gate wiring; Source / drain electrodes positioned on the semiconductor layer spaced apart from each other by a predetermined interval and overlapping portions of both edges of the gate electrode; It consists of a channel formed in the source / drain electrode separation section.

In addition, a passivation layer 540 is formed on the channel, and a passivation layer 540 is formed to contact the source / drain electrode and the pixel electrode.

In addition, the upper panel 560 and the lower panel 510 may be bonded to form the liquid crystal panel 500. In order to maintain a constant gap between two substrates 510 and 560, a spacer 610 is required. The spacer 610 is formed on the upper plate 560, and is formed to abut the opposite lower plate 510.

The spacer 610 maintaining the cell gap is formed on an area including the black matrix 570, the color filter 590, and the planarization layer 600.

In general, the black matrix 570 deposits chromium / chromium oxide on the top plate 560 to form a pattern of the black matrix 570. The color filter 590 is formed by applying a color resin by a printing method or the like. Meanwhile, the planarization film 600 is formed to planarize the unevenness generated when the patterned black matrix 570 and the color filter 590 are formed.

Here, a spacer 610 pattern for maintaining a cell gap is formed in a region including the black matrix 570, the color filter 590, and the planarization layer 600. In addition, the region including the black matrix 570, the color filter 590, and the planarization layer 600 corresponds to the region of the metal wiring 520 of the lower plate 510.

However, the color filter 590 and the planarization film 600 form a film, and the film formed varies depending on the thickness. In addition, as the film thickness increases, the variation that varies depending on the film thickness occurs. Therefore, such a deviation makes it difficult to uniformly form the film thickness in the region where the spacer 610 is formed.

As shown in FIG. 2, the color filter 590 film is formed on the black matrix 570, and the planarization film 600 is formed on the color filter 590 film. Here, the spacer 610 is provided in a region where the black matrix 570, the color filter 590, and the planarization layer 600 are formed to maintain the cell gap.

However, the color filter 590 or the planarization film 600 is formed. In the process of forming the films, each of the films may have a deviation.

As shown in FIG. 2, in general, the size of the cell gap is determined by designating an average point to determine the size of the cell gap. The planarization film 600 is not evenly planarized so that the spacer 610 is large. The spacer 610 having an average value or more is formed. In addition, a large deviation may result in the formation of the spacer 610 above the average. Similarly, the spacer 610 may be formed to a size below the average.

This deviation causes local or overall spacer 610 uniformity to be inferior, making it difficult to form a spacer 610 formed on the planarization film 600 with a uniform thickness, which makes it difficult to maintain uniform cell spacing. do.

Therefore, it is desirable to make the spacer 610 uniform by minimizing the variation by thinning the thickness of the film in the region where the spacer 610 is formed or by omitting any one film from the plurality of films.

Accordingly, since the thickness of the spacer 610 formed between the two substrates 510 and 560 is not uniformly formed, the cell gap is not constant.

Therefore, such a problem causes the display screen to not display an image of uniform brightness due to an inconsistent cell gap, resulting in deterioration of the display screen.

In order to maintain a uniform cell gap of a liquid crystal display, the present invention minimizes a large number of film variations generated in forming a film in a region where a spacer is formed by forming a hydrophobic film on a substrate, thereby maintaining a constant cell gap and maintaining a refined image. An object of the present invention is to provide a liquid crystal display and a method of manufacturing the same.

In order to achieve the above object, the liquid crystal display device of the present invention comprises a metal wiring formed on the second substrate; A black matrix formed on the first substrate and covering the pattern of the metal wiring; A hydrophobic film formed on the black matrix; A color filter formed between the hydrophobic film; It characterized in that it comprises a plurality of spacers formed in the region where the hydrophobic film is formed.

The metal wiring may further include an insulating film for insulating the metal wiring and a protective film for protecting a plurality of devices connected to the metal wiring.

Here, the hydrophobic film is characterized in that it has a few properties in the color filter.

As a means for achieving the object of the present invention, a method of manufacturing a liquid crystal display device comprises the steps of sequentially forming a black matrix material and a hydrophobic film material on the first substrate; Forming a black matrix and a hydrophobic film in a predetermined region of the first substrate; Forming a color filter between the hydrophobic films; Forming a planarization film on the color filter; And forming a spacer in a region in which a hydrophobic film is formed on the planarization film.

As another means for achieving the object of the present invention, a method of manufacturing a liquid crystal display device comprising the steps of forming a material on which a black matrix material and a hydrophobic film material are mixed on a first substrate; Forming a black matrix and a hydrophobic film in a predetermined region of the first substrate; Forming a color filter between the hydrophobic films; Forming a planarization film on the color filter; And forming a spacer in a region in which a hydrophobic film is formed on the planarization film.

And bonding the first substrate and the second substrate corresponding to the first substrate to form a liquid crystal layer, and when the bonding is performed, the spacer is seated on the metal wiring provided on the second substrate. It features.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and those skilled in the art can implement many other embodiments using the teachings of the present invention. It is not limited to this.

3 is a plan view of a liquid crystal display according to the present invention.

As shown in FIG. 3, a metal matrix 20 for transmitting a signal is provided on the second substrate (see 10 in FIG. 4), and a black matrix 70 covering the pattern of the metal wiring 20 is provided on the first substrate. It is provided on (60). The switching element T is provided in an area where the plurality of metal wires 20 intersect in the horizontal and vertical directions.

In addition, a color filter 90 having a plurality of colors is formed in the pixel partitioned by the black matrix 70. A spacer 100 is provided which maintains a gap between the first substrate (reference numeral 60 in Fig. 4) and the second substrate (reference numeral 10 in Fig. 4).

4 is a cross-sectional view taken along line III-III ′ of FIG. 3.

As shown in FIG. 4, the liquid crystal panel 1 includes a color filter 90, a black mattress 70, a hydrophobic film 80, a planarization film 100, and a spacer 110 on a first substrate 60. It is prepared.

The black matrix 70 distinguishes a color boundary between the colors of adjacent colors in a matrix form. In addition, the black matrix 70 separates the plurality of color filters 90 and absorbs the light incident from the adjacent color filters 90 to prevent optical interference, thereby preventing the contrast ratio from decreasing.

The hydrophobic layer 80 may be provided on the black matrix 70. The hydrophobic film 80 is characterized by having hydrophobicity (phobia) with respect to the resin or the like forming the color filter 90. By forming the hydrophobic film 80 on the black matrix 70, the color filter 90 is hardly formed on the black matrix 70 by the hydrophobic film 80. In addition, since the hydrophobic film 80 separates the color filter 90, color mixing generated by the color filter 90 may be prevented.

Here, the color filter 90 is hardly present on the hydrophobic film 80 by the hydrophobic film 80 provided on the black matrix 70. Accordingly, by preventing the color filter 90 layer, which may occur due to the film formation, from being formed on the black matrix 70, the larger the thickness of the film, the greater the variation that may occur.

The color filter 90 selectively transmits a color of a predetermined wavelength to implement a plurality of colors. The color filter 90 is formed in an area partitioned by the black matrix 70. The color filter 90 is not formed on the black matrix 70 by the hydrophobic film 80 formed on the black matrix 70. Accordingly, it is possible to reduce the layer in which the deviation may occur due to the film formation in the region where the spacer 110 is to be formed.

The planarization layer 100 smoothes the surface by removing a step that may occur while forming the color filter 90 or the black matrix 70. The common electrode (not shown) is formed on the planarization film 100 to provide a uniform electric field to the liquid crystal forming the liquid crystal layer 50.

The spacer 110 serves to keep the first substrate 60 and the second substrate 10 uniformly at cell spacing. The spacer 110 is formed on the planarization film 100, and is provided in a region where the hydrophobic film 80 and the black matrix 70 are formed with the planarization film 100 interposed therebetween. In addition, the spacer 110 may be formed to correspond to any one of the metal wiring 20 and the switching element T provided on the second substrate 10.

Here, by not forming the color filter 90 layer in which the spacer 110 is provided, the variation may be reduced according to the film thickness so that the spacer 110 uniformly spaces the liquid crystal layer 50. Can be formed.

On the other hand, as shown in FIG. 4, a plurality of switching elements T are formed in a region where a plurality of metal wires 20 formed in a direction perpendicular to each other cross each other. An insulating film 30 that insulates the metal wires 20 and a protective film 40 that protects the device are formed on the insulating film 30.

The plurality of metal wires 20 are formed to correspond to the black matrix 70 formed on the first substrate 60 so that the pattern of the metal wires 20 is not visible on the display screen. The spacers 110 are formed on the black matrix 70 so that the metal wirings 20 and the spacers 110 abut each other to form a cell gap that is the thickness of the liquid crystal layer 50.

Referring to FIG. 2, the color filter 590 and the planarization layer 600 are conventionally formed, but a deviation occurs. The spacer 610 is provided on two layers on which the color filter 590 and the black matrix 570 are formed. Deviation in the two layers 590 and 570 thus formed causes a problem of uniform cell spacing.

However, according to the present invention, since the hydrophobic film 80 is provided on the black matrix 70, there is almost no color filter 90 on the black matrix 70 which causes a deviation due to the film formation. Therefore, the planarization film 100 may be formed on the hydrophobic film 80 in which the color filter 90 is hardly formed, thereby minimizing variation due to the film thickness. Thus, the spacer 110 can be formed uniformly, so that the cell gap can be kept constant.

Accordingly, the cell gap can be uniformly formed, and the gravity gap due to the liquid crystal overload and the spacer 110 for maintaining the cell gap can be uniformly formed, thereby eliminating touch failure due to external impact.

5A to 5C are views showing a hydrophobic film formation method.

As shown in Fig. 5A, a black matrix material 70a is prepared. As shown in FIG. 5B, a hydrophobic film material 80a is provided on the black matrix material 70a. The prepared black matrix (70 in FIG. 4) separates a plurality of color filters (90 in FIG. 4) and absorbs light incident from an adjacent color filter (90 in FIG. 4), thereby preventing light interference. To prevent degradation.

As shown in FIG. 5C, in the step of forming the black matrix material 70a and the hydrophobic film material 80a, a photoresist (not shown) is prepared by using a photomask technique, and exposed to light. The pattern of the matrix 70 and the hydrophobic film 80 is formed.

6A and 6B illustrate another embodiment of forming a hydrophobic film.

As shown in FIG. 6A, the mixed material 120 of the black matrix 70a and the hydrophobic film 80a includes a black matrix material 70a and a material having hydrophobicity in the color filter (90 in FIG. 4) material. Is provided on the first substrate 60. Here, the mixed material 120 is characterized in that the material of the hydrophobic film 80a is mixed with the material of the black matrix 70a.

At this time, the hydrophobic material is pushed out over the black matrix material 70a, and the hydrophobic film material 80a is naturally formed on the black matrix 70a. In this case, the black matrix 70 and the hydrophobic film 80 are formed together by exposure and development using a mask technique.

7A to 7E are manufacturing process diagrams of the liquid crystal display device of the present invention.

As shown in FIG. 7A, the color matrix 90 formed later on the black matrix 70 and the black matrix 70 that separate the boundary of the color between the colors of the adjacent colors manufactured by the method described above. A hydrophobic film 80 having a material and hydrophobicity is formed.

As shown in FIG. 7B, the color filter 90 is formed of a resin or pigment having a color on the first substrate 60 on which the black matrix 70 and the hydrophobic film 80 are formed. Here, the color filter 90 material is hardly formed on the black matrix 70 by the hydrophobic film 80 provided. Accordingly, since the film does not form a deviation in forming the film, the deviation can be minimized.

As shown in FIG. 7C, the planarization film 100 for planarizing the level difference generated in the process of performing the above steps is formed on the first substrate 60 on which the color filter 90 is formed. The planarization film 100 has no hydrophobicity with the hydrophobic film 80. The hydrophobic film 80 may be formed to have a hydrophilic property with the planarization film 100 through modification or the like.

As shown in FIG. 7D, a spacer 110 capable of maintaining a cell gap is formed on the first substrate 60 on which the planarization film 100 is formed. The spacer 110 is formed in a region including the black matrix 70 and the hydrophobic film 80.

Since the spacer 110 is formed with the planarization film 100 and the black matrix 70 with the hydrophobic film 80 interposed therebetween, the thickness of the spacer 110 is thinner than that of the conventional color filter. It can be minimized. Accordingly, the spacer 110 is uniformly formed.

On the other hand, as shown in Figure 7e, the metal wiring 20; An insulating film 30 for insulating the metal wiring 20; A switching element T formed by crossing the metal wiring 20; A second substrate 10 having a protective film 40 protecting the switching element T is provided. The liquid crystal layer 50 is formed by bonding to the second substrate 10 and the first substrate 60 shown in FIG. 7D.

Therefore, the cell spacing can be kept constant due to the uniformly formed spacers 110 by minimizing the variation occurring according to the film thickness.

Accordingly, due to the spacers 110 formed on the film with minimized film variation, it is possible to solve the gravity failure due to the overfilling of the liquid crystal and the touch failure due to external impact. In addition, since the cell spacing is uniform, the transmitted light is constant to display uniform brightness, and a bright screen can be realized.

As described above, in the present invention, a hydrophobic film is provided on the black matrix of the first substrate so that the color filter is not formed on the hydrophobic film, thereby minimizing the variation in the film formation. Accordingly, by providing a spacer on the film with minimized variation, the cell gap of the liquid crystal panel can be maintained uniformly, and the touch failure due to external impact and the gravity failure of liquid crystal overfill due to the uniform spacer can be solved. . In addition, since the cell spacing is uniform, the transmitted light is uniform to display a uniform brightness, thereby realizing a bright screen.

Those skilled in the art through the above description will be capable of various changes and modifications without departing from the spirit of the present invention.

Claims (11)

A metal wiring formed on the second substrate; A black matrix formed on the first substrate and covering the pattern of the metal wiring; A hydrophobic film formed on the black matrix; A color filter formed between the hydrophobic film; And a plurality of spacers formed in a region where the hydrophobic film is formed. The method of claim 1, And an insulating film for insulating the metal wiring and a protective film for protecting a plurality of devices connected to the metal wiring on the metal wiring. The method of claim 1, And the hydrophobic film has a minority property in the color filter. The method of claim 1, And a planarization film is further provided between the hydrophobic film and the spacer. Sequentially forming a black matrix material and a hydrophobic film material on the first substrate; Forming a pattern of a black matrix and a hydrophobic film in a predetermined region of the first substrate; Forming a color filter between the hydrophobic films; Forming a planarization film on the color filter; Forming a spacer in a region in which a hydrophobic film is formed on the planarization film. Forming a material on which the black matrix material and the hydrophobic film material are mixed on the first substrate; Forming a pattern of a black matrix and a hydrophobic film in a predetermined region of the first substrate; Forming a color filter between the hydrophobic films; Forming a planarization film on the color filter; Forming a spacer in a region in which a hydrophobic film is formed on the planarization film. The method according to claim 5 or 6, And bonding the first substrate and the second substrate corresponding to the first substrate to form a liquid crystal layer, and when the bonding is performed, the spacer is seated on a metal wiring provided on the second substrate. Liquid crystal display device manufacturing method. The method of claim 5, And the black matrix and the hydrophobic film are laminated. The method according to claim 5 or 6, And the metal wiring further comprises an insulating film for insulating the metal wiring and a protective film for protecting a plurality of devices connected to the metal wiring. The method according to claim 5 or 6, And the hydrophobic film has a minority property in the color filter. The method according to claim 5 or 6, And a planarization film for flattening the unevenness of the first substrate is formed between the hydrophobic film and the spacer.

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