KR101380435B1 - Liquid crystal display and method for manufacturing the same - Google Patents

Abstract

A liquid crystal display and a manufacturing method thereof are disclosed. The liquid crystal display includes a color filter formed on a first substrate, a black matrix disposed in a form of a matrix, and a column spacer formed to protrude from the black matrix in a form integral with the black matrix, a part of which is disposed on the color filter, A color filter substrate expressing color using incident light; A thin film transistor substrate including a thin film transistor and a pixel electrode formed on the second substrate, spaced apart from the color filter substrate by a column spacer of the color filter substrate, and bonded to the color filter substrate by a sealant; And a liquid crystal layer formed between the color filter substrate and the thin film transistor substrate.

Color filter, black matrix, common electrode, column spacer, step

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY AND METHOD FOR MANUFACTURING THE SAME}

1 is a cross-sectional view illustrating a conventional color filter substrate.

2 is a plan view illustrating a color filter substrate included in a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a cross-sectional view taken along line III-III ′ of FIG. 2.

4 is a cross-sectional view taken along line IV-IV ′ of FIG. 2.

5A to 5E are cross-sectional views illustrating a method of manufacturing the color filter substrate illustrated in FIG. 2.

6 is a cross-sectional view for describing a liquid crystal display according to an exemplary embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS FIG.

110: color filter substrate 120: first substrate

130: black matrix 140: column spacer

160: partial exposure mask 200: liquid crystal display

210: thin film transistor substrate 220: second substrate

230: thin film transistor 250: pixel electrode

R / G / B: Red / Green / Blue Color Filter

The present invention relates to a liquid crystal display and a manufacturing method thereof.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. Accordingly, flat panel displays (FPDs) such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs) may be used. Usage is increasing. Among them, liquid crystal displays capable of realizing high resolution and being capable of miniaturization as well as miniaturization are widely used.

Generally, a liquid crystal display can display an image using the electro-optical characteristic of the liquid crystal which comprises a liquid crystal layer.

To this end, the conventional liquid crystal display device may include a thin film transistor substrate and a color filter substrate bonded together with the liquid crystal layer interposed therebetween.

The thin film transistor substrate may apply a driving voltage provided from the outside, for example, a data voltage, to the liquid crystal layer.

To this end, the thin film transistor substrate may include a thin film transistor and a pixel electrode formed of a thin film on a substrate made of a material such as glass or plastic. Here, the pixel electrode may apply a data voltage to the liquid crystal layer.

The color filter substrate may cause an image viewed through the liquid crystal display to have a color.

To this end, the color filter substrate may include a color filter, a black matrix, and a column spacer formed in a thin film on another substrate of a material such as glass or plastic. In addition, the color filter substrate may further include a common electrode. The common electrode may be formed on the thin film transistor substrate.

In the conventional liquid crystal display having the above-described configuration, the black matrix of the color filter substrate may be generally formed of a chromium material.

However, the black matrix formed of chromium material is excellent in light blocking and chemical resistance, but has a problem in that the manufacturing process is complicated. In addition, the black matrix having a chromium material has a problem that the light reflectance is high.

For this reason, in recent years, the black matrix is manufactured using the photosensitive resin material.

1 is a cross-sectional view illustrating a conventional color filter substrate.

Referring to FIG. 1, the black matrix 30 formed on the substrate 20 using the photosensitive resin material in the conventional color filter substrate 10 may be slightly inferior to the black matrix formed of the chromium material. Accordingly, there is a problem that the thickness of the black matrix 30 formed of the photosensitive resin material should be relatively large.

For this reason, the stepped portion A may be formed in the color filter R / G / B at a portion adjacent to the black matrix 30. At this time, due to the stepped portion A, there is a problem that the electric field applied to the liquid crystal layer through the common electrode 40 may be finely twisted.

As a result, there is a problem in that light leakage may occur in the liquid crystal display, and contrast may drop.

To prevent this, an overcoat may be further formed to cover the color filters R / G / B and the black matrix 30.

However, since an additional process must be performed to form the planarization film, the cost of the color filter substrate 10 may increase due to the planarization film.

In addition, in order to maintain the color filter substrate 10 and the thin film transistor substrate at regular intervals, the column spacer 50 must be formed on the common electrode 40 through a separate process. You can go even further.

The above-described problems can be passed on to the liquid crystal display as it is.

Accordingly, an aspect of the present invention is to provide a liquid crystal display and a method of manufacturing the same, which can minimize a step generated between a black matrix and a color filter.

In addition, another technical problem to be achieved by the present invention is to provide a liquid crystal display device and a method of manufacturing the same that can not form a planarization film by minimizing the step difference generated between the black matrix and the color filter.

In addition, another technical problem to be achieved by the present invention is to provide a liquid crystal display device and a manufacturing method that can reduce the manufacturing cost.

Further technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above are clearly understood by those skilled in the art from the following description. It can be understood.

The liquid crystal display according to the present invention for achieving the above technical problem is disposed in the form of a color filter, a matrix formed on a first substrate, and the black matrix and a portion of which is integrally formed with the black matrix, a part of which is disposed on the color filter. A color filter substrate including a column spacer formed to protrude from the black matrix and expressing color by using light incident from the outside; A thin film transistor substrate including a thin film transistor and a pixel electrode formed on a second substrate, spaced apart from the color filter substrate by a column spacer of the color filter substrate, and bonded to the color filter substrate by a sealant; And a liquid crystal layer formed between the color filter substrate and the thin film transistor substrate.

Meanwhile, a method of manufacturing a liquid crystal display device according to the present invention for achieving the above technical problem is disposed in the form of a color filter, a matrix on a first substrate, and partly integrated with the black matrix and the black matrix positioned on the color filter. Providing a color filter substrate having column spacers protruding from the black matrix in a predetermined shape; Providing a thin film transistor substrate on which a thin film transistor and a pixel electrode are formed; And forming a liquid crystal layer between the color filter substrate and the thin film transistor substrate, and then bonding the color filter substrate and the thin film transistor substrate through a sealant.

The details of other embodiments are included in the detailed description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

Hereinafter, a liquid crystal display and a manufacturing method thereof according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The liquid crystal display according to the exemplary embodiment of the present invention may display an image by using the electro-optical characteristics of the liquid crystal.

To this end, the liquid crystal display according to the exemplary embodiment of the present invention may include a color filter substrate and a thin film transistor substrate bonded to each other with a liquid crystal layer made of liquid crystal interposed therebetween.

The thin film transistor substrate of the liquid crystal display having the above-described configuration will be described later with reference to FIG. 6, and the color filter substrate provided in the liquid crystal display will be described first with reference to FIGS. 2 to 4.

2 is a plan view illustrating a color filter substrate included in a liquid crystal display according to an exemplary embodiment of the present invention. 3 is a cross-sectional view taken along line III-III ′ of FIG. 2. 4 is a cross-sectional view taken along line IV-IV ′ of FIG. 2.

2 to 4, the color filter substrate 110 that may be provided in the liquid crystal display according to the exemplary embodiment of the present invention may implement a color of an image displayed through the liquid crystal display.

To this end, the color filter substrate 110 includes a color filter (R / G / B), a black matrix 130 and a column spacer 140 formed on the first substrate 120 having a material such as glass or plastic. can do. In addition, the color filter substrate 110 may further include a common electrode 150 formed on the first substrate 120. The common electrode 150 may be formed on the thin film transistor substrate of the liquid crystal display.

The color filters R / G / B may express colors using light incident from the outside. In detail, the color filters R / G / B may express colors by transmitting light having a specific wavelength band among light incident from the outside.

To this end, the color filters R / G / B transmit red / green / blue light from the light incident from the outside to express the red / green / blue color filters R / G / B. ) May be included. In this case, various colors may be realized through additive mixing of red / green / blue light transmitted through each of the red / green / blue color filters (R / G / B).

Each of the red / green / blue color filters R / G / B is spaced apart from the red / green / blue color filters R / G / B adjacent to each other as shown in FIG. 4, the stripe may be arranged on the first substrate 120 in a band shape, but is not limited thereto.

The black matrix 130 may block light incident from the outside. Specifically, when the color filter substrate 110 is provided in the liquid crystal display device, the black matrix 130 blocks the light so that light incident from the outside does not pass through the region that cannot control the liquid crystal of the liquid crystal display device. The contrast of the liquid crystal display device can be increased.

To this end, the black matrix 130 may be formed of a photosensitive resin containing a black pigment.

The black matrix 130 may be formed in a matrix form between the color filters R / G / B. At this time, if the thickness of the black matrix 130 is slightly larger than the thickness of the color filter (R / G / B), the black matrix 130 may be part of the black matrix 130 is located on the color filter (R / G / B). .

As a result, the black matrix 130 may partially overlap the color filters R / G / B. In this case, when the thickness of the black matrix 130 positioned at a portion where the black matrix 130 and the color filter (R / G / B) overlap with each other within the limit that the light blocking property of the black matrix 130 does not fall, A step difference generated between the black matrix 130 and the color filters R / G / B may be minimized.

As described above, the reason why the thickness of the black matrix 130 at the portion where the black matrix 130 and the color filter R / G / B overlap can be made relatively small is that any of the color filters R / G / B This is because the degree of light shielding.

Specifically, for example, light incident from the outside does not transmit 100% of the color filter (R / G / B), but only about 60% of the light incident from the outside transmits the color filter (R / G / B). The remaining 40% of the light incident from the outside may be blocked by the color filter (R / G / B). For this reason, the thickness of the black matrix 130 of the site | region in which the black matrix 130 and the color filters R / G / B overlap is relatively small.

As a result, since a step generated between the black matrix 130 and the color filters R / G / B may be minimized, it may be unnecessary to further form a planarization film to remove the step. As a result, the manufacturing cost of the color filter substrate 110 may be reduced, and as a result, the manufacturing cost of the liquid crystal display may be reduced.

The column spacer 140 may include the thin film transistor substrate and the color filter substrate 110 of the liquid crystal display at regular intervals, for example, between about 2 μm and 5 μm when the color filter substrate 110 is provided in the liquid crystal display. Can be spaced apart.

To this end, the column spacer 140 may be formed to protrude from the black matrix 130 in an integrated form with the black matrix 130. In this case, the column spacer 140 may protrude from the black matrix 130 so as not to overlap the color filters R / G / B. This is to prevent the loss of light transmitted through the color filter R / G / B due to the column spacer 140.

The column spacer 140 may be formed of a photosensitive resin including the same material as the black matrix 130, that is, a black pigment, so as to be integrally formed with the black matrix 130.

Through this, the column spacer 140 may be formed simultaneously with the black matrix 130 using a photosensitive resin including a black pigment. Therefore, the manufacturing cost of the color filter substrate 110 can be further reduced, and as a result, the manufacturing cost of the liquid crystal display device can be further reduced.

The common electrode 150 may receive a common voltage from the outside. The common electrode 150 may be formed on the color filter R / G / B and the black matrix 130 to cover the color filter R / G / B and the black matrix 130. In this case, the common electrode 150 may not be formed on the column spacer 140. This is to prevent the short between the color filter substrate 110 and the thin film transistor substrate by the common electrode 150 when the color filter substrate 110 is provided in the liquid crystal display.

5A to 5E are cross-sectional views illustrating a method of manufacturing the color filter substrate illustrated in FIG. 2. 5A is a cross-sectional view illustrating a method of manufacturing a color filter, FIGS. 5B through 5D are cross-sectional views illustrating a method of manufacturing a black matrix and a column spacer, and FIG. 5E illustrates a method of manufacturing a common electrode. It is process cross section for doing this.

In order to manufacture the color filter substrate 110 that may be provided in the liquid crystal display according to the exemplary embodiment of the present invention, first, as shown in FIG. 5A, the color filter (R / G) is formed on the first substrate 120. / B). For this purpose, a pigment dispersion method may be used, but is not limited thereto. Here, the red / green / blue color filters (R / G / B) may be sequentially formed, but are not limited thereto.

Next, as shown in FIGS. 5B to 5D, the black matrix 130 and the column spacer 140 are integrally formed on the first substrate 120 using the partial exposure mask 160.

Specifically, first, as shown in FIG. 5B, the photosensitive resin 170 including the black pigment is coated on the entire surface of the first substrate 120. To this end, methods such as spin coating, slit and spin coating and spinless coating may be used, but are not limited thereto. Here, the photosensitive resin 170 may be, for example, a negative photosensitive resin 170.

Next, as shown in FIG. 5C, light is irradiated to the photosensitive resin 170 using the partial exposure mask 160. The partial exposure mask 160 may be one of a transflective mask and a slit mask.

Specifically, first, the partial exposure mask 160 is disposed on the first substrate 120 to be spaced apart from the first substrate 120 by a predetermined interval. In this case, the first substrate 120 may be divided into a complete exposure area AE, a partial exposure area HE, and a non-exposure area NE due to the disposed partial exposure mask 160. Here, the complete exposure area AE refers to an area where the black matrix 130 and the column spacer 140 are to be formed due to complete light irradiation. In addition, the partial exposure area HE refers to an area where the black matrix 130 is to be formed due to partial light irradiation. The non-exposure region NE refers to a region where the black matrix 130 and the column spacer 140 are not formed due to light blocking.

Subsequently, light, for example, ultraviolet rays, is irradiated on the partial exposure mask 160 in the direction of the first substrate 120. At this time, due to the light irradiation, complete curing of the photosensitive resin 170 may be performed in the complete exposure area AE, and partial curing of the photosensitive resin 170 may be performed in the partial exposure area HE. In the region NE, the photosensitive resin 170 may not be cured at all.

Next, as shown in FIG. 5D, the photosensitive resin 170 is developed. As a result, the black matrix 130 and the column spacer 140 may be integrally formed on the first substrate 120.

Next, as shown in FIG. 5E, the common electrode 150 is formed on the first substrate 120.

Specifically, a transparent conductive material such as indium tin oxide (ITO) and indium zinc oxide (IZO) is formed on the entire surface of the first substrate 120. For this purpose, a sputtering method can be used. In this case, the transparent conductive material may be formed on the column spacer 140. To remove this, the common electrode 150 may be formed by photo etching the transparent conductive material.

6 is a cross-sectional view for describing a liquid crystal display according to an exemplary embodiment of the present invention. Since the color filter substrate illustrated in FIG. 6 is the same as the color filter substrate illustrated in FIG. 2, the same reference numerals will be used to describe the same.

Referring to FIG. 6, the liquid crystal display 200 according to the exemplary embodiment of the present invention may display an image using the electro-optical characteristics of the liquid crystal 202 constituting the liquid crystal layer as described above.

To this end, the liquid crystal display 200 is spaced apart by a predetermined interval with the liquid crystal 202 constituting the liquid crystal layer interposed therebetween, and the color filter substrate 110 and the thin film transistor substrate 210 bonded through the sealant 204 are separated from each other. It may include. Here, the liquid crystal 202 may have a positive or negative dielectric anisotropy.

The color filter substrate 110 may express the color of the image displayed through the liquid crystal display 200 using light incident from the outside.

To this end, the color filter substrate 110 may include a color filter (R / G / B), a black matrix 130 and a column spacer 140 formed on the first substrate 120 having a material such as glass or plastic. Can be. In addition, the color filter substrate 110 may further include a common electrode 150 formed on the first substrate 120.

The thin film transistor substrate 210 may apply a driving voltage for driving the liquid crystal 202 to the liquid crystal 202.

To this end, the thin film transistor substrate 210 may include a thin film transistor 230 and a pixel electrode 250 formed on the second substrate 220 of a material such as glass or plastic.

The thin film transistor 230 may be used as a switching element for driving the liquid crystal 202.

To this end, the thin film transistor 230 may include a gate electrode 232, a source electrode 234, a drain electrode 236, an active layer 238, an ohmic contact layer 240, and the like.

The pixel electrode 250 is connected to the contact hole 252 with the drain electrode 236 of the thin film transistor 230, and may apply a driving voltage provided thereto to the liquid crystal 202 through the thin film transistor 230. Here, the pixel electrode 250 may be formed of a transparent metal material.

Reference numerals denote the gate insulating film 260 and the protective film 270.

The liquid crystal display 200 described above forms a color filter substrate 110 and a thin film transistor substrate 210, and then forms a liquid crystal layer between the color filter substrate 110 and the thin film transistor substrate 210 and then sealant. The color filter substrate 110 and the thin film transistor substrate 210 may be bonded to each other through 204. Here, since the method of providing the color filter substrate 110 is the same as described above, the detailed description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

According to the present invention, since the step difference between the black matrix and the color filter can be minimized, the planarization film can not be formed. In addition, the column spacer may be formed in an integrated form with the black matrix. Through this, manufacturing cost of the liquid crystal display device can be reduced.

Claims (11)

A column formed of a photosensitive resin including a color filter formed on the first substrate, a black matrix positioned in the form of a matrix, and partially including the black pigment positioned on the color filter and protruding from the black matrix in a form integrated with the black matrix; A color filter substrate including a spacer and expressing a color by using light incident from the outside; A thin film transistor substrate including a thin film transistor and a pixel electrode formed on a second substrate, spaced apart from the color filter substrate by a column spacer of the color filter substrate, and bonded to the color filter substrate by a sealant; A liquid crystal layer formed between the color filter substrate and the thin film transistor substrate; And A common electrode formed directly on the color filter and the black matrix and receiving a common voltage from the outside; The thickness of the black matrix is thicker than the thickness of the color filter, The color filters are arranged in a band shape, The planarization layer positioned between the color filter and the black matrix and the common electrode is omitted. The common electrode is unformed on the column spacer, And the black matrix has a thickness of an area overlapping the color filter is thinner than a thickness of another area so as to minimize a step generated between the black matrix and the color filter. delete delete delete delete A column spacer formed of a photosensitive resin comprising a black filter disposed on the first substrate in the form of a color filter, a matrix, and partially protruding from the black matrix in a form integral with the black matrix; Providing a color filter substrate comprising a; Providing a thin film transistor substrate on which a thin film transistor and a pixel electrode are formed; And Forming a liquid crystal layer between the color filter substrate and the thin film transistor substrate, and then bonding the color filter substrate and the thin film transistor substrate through a sealant, Preparing the color filter substrate, Forming a color filter on the first substrate; Applying a photosensitive resin comprising a black pigment on the first substrate; Irradiating light onto the photosensitive resin using a partial exposure mask; Forming a black matrix and a column spacer in an integrated form on the first substrate by using the developing of the photosensitive resin; Forming a common electrode directly on the color filter and the black matrix to receive a common voltage from the outside; The thickness of the black matrix is thicker than the thickness of the color filter, The color filters are arranged in a band shape, The planarization layer positioned between the color filter and the black matrix and the common electrode is omitted. The common electrode is unformed on the column spacer, And the black matrix has a thickness of an area overlapping with the color filter is smaller than a thickness of another area so as to minimize a step generated between the black matrix and the color filter. delete delete delete delete delete

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