KR20040054187A - Lcd and method for manufacturing color filter substructure - Google Patents

Abstract

PURPOSE: An LCD(Liquid Crystal Display) and a method for fabricating a color filter substrate are provided to easily prevent light leakage generated from an array substrate and produce a compact LCD. CONSTITUTION: An LCD includes an array substrate, a color filter substrate, and a liquid crystal layer(45). The array substrate includes gate bus lines and data bus lines, which are formed on a transparent lower substrate(50) to define unit pixel regions, thin film transistors respectively arranged at the unit pixel regions, a gate pad supplying a signal to the gate bus lines, and a data pad supplying a signal to the data bus lines. The color filter substrate includes a black matrix(31) formed on a transparent upper substrate(30), red, green and blue color filters (33,35,37) respectively formed in the pixel regions, and color filter layers(33a,35a,37a) formed on a region of the black matrix, which corresponds to the gate pad and the data pad of the array substrate. The liquid crystal layer is interposed between the array substrate and the color filter substrate to control the quantity of transmitted light generated from a back light unit.

Description

LCD and METHOD FOR MANUFACTURING COLOR FILTER SUBSTRUCTURE}

The present invention relates to a liquid crystal display device and a method for manufacturing a color filter substrate, and more particularly, to improve the optical density (OPTICAL DENSITY) lowered by using a resin-based material of the black matrix formed on the color filter substrate, The present invention relates to a liquid crystal display device and a color filter substrate manufacturing method capable of realizing a light and thin structure.

The liquid crystal display is one of the fastest growing flat panel display devices and is expected to lead the display device market in the future. In order to display a high quality and high contrast of the liquid crystal display, a black matrix having excellent light blocking property is required between three colors of red (R), green (G), and blue (B) color filters.

In particular, in the case of an active matrix driving type TFT-LCD using a thin film transistor, high light shielding property is required. In general, a black matrix is formed by forming a metal film such as chromium on a substrate by vacuum deposition or the like, coating a photosensitive resin, and then patterning and etching chromium by a photolithography method.

The black matrix using chromium may be manufactured as a thin film and has the advantage of obtaining chemical resistance and high light blocking performance, but due to the high light reflectance, the display quality is deteriorated and a separate treatment process is required for total reflection. Since the vacuum deposition processor such as chromium sputtering is involved, the manufacturing cost is increased, and the waste liquid generated after the etching process due to the chromium etching is required to cause environmental pollution. In recent years, the black matrix using resin has been actively studied. have.

In general, a method of forming a black matrix using a resin between color filter layers of red, green, and blue on a color filter substrate may be manufactured by a method such as dyeing, printing, pigment dispersion, and electrodeposition. The matrix is mainly produced by the pigment dispersion method.

The pigment dispersion method is a color filter substrate by coating a photosensitive resin composition containing a colorant on a transparent substrate provided with a black matrix, exposing the pattern to be formed, and then removing a non-exposed portion with a solvent and thermally curing the color filter substrate. It is a method of manufacturing.

The black matrix produced by the pigment dispersion method is composed of two components, a polymer compound that largely supports the role of a support and maintains a certain thickness, that is, a binder resin and a photopolymerizable monomer that reacts with light during exposure to form a photoresist image. And a photosensitive resin composition containing a pigment, a polymerization initiator, an epoxy resin, a solvent and other additives, etc., in addition to the above components. As the binder resin used in the pigment dispersion method, a photosensitive resin composed of the acrylic polymer and azide compound described is used.

In addition, various kinds of photosensitive resins including a radical polymerization photosensitive resin composed of a known acrylate monomer, an organic polymer binder and a photopolymerization initiator, a phenol resin, a crosslinking agent having an N-methylol structure, and a photoacid generator have been proposed.

In addition, the photosensitive resin which forms an image using an acid generated by exposure has a high sensitivity and is not affected by oxygen when exposed, but a heating process is required during exposure and development, and a heating time is required for pattern formation. It has a problem that it is difficult to control the process because of the sensitive reaction.

1A to 1C are cross-sectional views illustrating a manufacturing process of a color filter substrate of a liquid crystal display according to the related art.

As shown in FIG. 1A, the method of forming the black matrix 1 on the transparent upper substrate 10 may be formed by depositing and patterning an opaque metal having a low reflection characteristic such as chromium (Cr) or by forming a photosensitive black resin. After coating is formed by exposing and etching it.

Recently, when the chromium film is used as the material of the black matrix, since it is a heavy metal material, it has a serious effect on environmental pollution. Therefore, patterning is performed using a metal other than the heavy metal or a synthetic resin material.

The black matrix 1 formed on the transparent upper substrate 10 corresponds to the pixels of the active layer on the array substrate, and is formed along the edge of the upper substrate to prevent light leakage even in regions corresponding to the gate pad and data pad regions. Form a black matrix.

When the black matrix 1 is formed on the transparent upper substrate 10 as described above, as shown in FIG. 1B, the colors of red, green, and blue are shown in FIG. 1B. Filter layers R, G, and B are formed.

Usually, the method of forming the color filter layers (R, G, B) is formed by a pigment spraying method, which repeats the process of applying, exposing and patterning a photoresist resist that has been prepared by using a pigment prepared in advance. This is a method of forming a color filter of red, green, and blue.

At this time, an acrylic resin or the like may be used as a material of the color filter. In order to pattern the resin, pre-bake, exposure, development, post-bake Can be patterned through the process.

When the red color filter layer 3 is formed on the lattice space of the black matrix 1, a green photoresist film is then applied, exposed and developed to form the green color filter layer 5. In the same manner, a blue photoresist film is coated on the transparent upper substrate 10 having the red and green color filter layers 3 and 5 formed thereon, and then exposed and developed to form a blue color filter layer to form the red and green blue color filter layers 7. Form.

When the red (R), green (G), and blue (B) color filter layers 3, 5, and 7 are formed in this way, as shown in FIG. 1C, the black matrix 1 is formed on the transparent upper substrate 10. ) And the red, green, and blue color filter layers 3, 5, and 7 are coated to form an overcoat layer 9 by applying a transparent resin having an insulating property on the upper substrate 10 to planarize. Form.

Subsequently, although not shown in the drawing, a common electrode is formed and an electric field for twisting the liquid crystal molecules together with the pixel electrode of the array substrate is formed.

2 is a cross-sectional view showing the structure of a liquid crystal display according to the prior art.

As shown in FIG. 2, a liquid crystal display device includes a pixel formed on a color filter substrate including a black matrix 1 and color filter layers 3, 5, and 7 on an upper substrate 10, and a lower substrate 20. An array substrate on which an active layer 23 including an electrode and a switching element and a pad layer 21 for applying driving signals and graphic signals to an array wiring are formed is bonded to each other with the liquid crystal layer 25 interposed therebetween.

That is, when the array substrate and the color filter substrate are completed, they are combined to form one liquid crystal cell. Usually, the seal line 11 is coated on the edge of the array substrate, and the spacers are scattered on the color filter substrate. It adheres by ultraviolet irradiation.

The bonded structure of the liquid crystal cell serves to seal the liquid crystal layer 25 while the seal line 11 supports two substrates along edges of the color filter substrate and the array substrate.

Although not shown in the drawings, a plurality of spacers are distributed between the array substrate and the color filter substrate to maintain a constant cell gap between the two substrates.

The color filter layer forming region of the color filter substrate corresponds to the active layer 23 of the array substrate so that a light source passing through the pixel electrode formed in the active layer 23 passes through the liquid crystal molecules, thereby causing red color of the color filter substrate. The green, blue and blue color filter layers 3, 5, and 7 are transmitted to display various colors.

In particular, a gate pad and a data pad layer 21 are formed on an edge of the array substrate, and the black matrix 1 on the color filter substrate facing the pad layer 21 is formed to have a rather wide width.

This is to prevent light leakage from occurring in the pad region due to the progress of the backlight light source traveling between the active layer 23 and the pad layer 21 on the array substrate.

This is because the fixing part of the bezel, which is used for fixing along the edge for constant optical coupling with the backlight units after the liquid crystal cell is cut and the liquid crystal panel is completed, also has a structure for preventing light leakage along the edge of the array substrate. For this reason.

However, as described above, the color filter substrate formed by using the resin-based material as a black matrix has a low optical density, so that backlight light generated by light leakage to the pad region of the array substrate passes outside the edge resin black matrix. There was a problem that damaged the screen quality with me.

In addition, in order to prevent light leakage in the pad area of the liquid crystal display device, the backlight assembly and the bezel supporting the liquid crystal panel have a thick and large disadvantage, which makes it difficult to apply to a liquid crystal display device requiring thin and small size, such as a notebook. There was a problem.

The present invention can easily block light leakage generated along the pad region of the array substrate by increasing the resin black matrix optical density of the edge region of the color filter substrate, and can make the structure of the liquid crystal display device light and simple. It is an object of the present invention to provide a liquid crystal display and a method for manufacturing a color filter substrate.

1A to 1C are cross-sectional views illustrating a process for manufacturing a color filter substrate of a liquid crystal display device according to the prior art.

2 is a cross-sectional view showing the structure of a liquid crystal display device according to the prior art.

3A to 3E are cross-sectional views illustrating a process for manufacturing a color filter substrate of a liquid crystal display according to the present invention.

4 is a cross-sectional view showing the structure of a liquid crystal display device according to the present invention;

* Description of the symbols for the main parts of the drawings *

30: transparent upper substrate 31: resin black matrix

33: red color filter layer 33a: red color layer

35: green color filter layer 35a: green color layer

37: blue color filter layer 37a: blue color layer

39: overcoat layer 41: seal line

50: transparent lower substrate 51: pad layer

53: active layer

In order to achieve the above object, the liquid crystal display device according to the present invention,

Thin film transistors are arranged on the transparent lower substrate so as to vertically cross a gate bus line and a data bus to define a unit pixel area, and are respectively disposed in the unit pixel area, and a gate pad for applying a signal to the gate bus line and the data bus line. An array substrate comprising a data pad and a data pad;

A black matrix composed of a resin-based material on the transparent upper substrate, a color filter layer of red, green, and blue disposed in each pixel region of the black matrix, and a black corresponding to the gate pad and data pad regions on the array substrate. A color filter substrate composed of a color filter layer stacked on the matrix; And

A liquid crystal layer interposed between the array substrate and the color filter substrate to adjust an amount of light transmitted from a backlight; Characterized in that it comprises a.

The black matrix may be formed of an acrylic polymer, an azide compound, an acrylate monomer, an organic polymer binder, and a photosensitive resin of a photoinitiator, and may be formed on the color filter substrate corresponding to a gate pad and a data pad region of the array substrate. The width of the black matrix is equal to or smaller than the width of the gate pad or data pad, and two of the color filter layers of red, green, and blue are formed on the black matrix on the color filter substrate corresponding to the gate pad and data pad area of the array substrate. It has a structure in which the above-mentioned color filter layer is laminated | stacked.

In particular, the color filter layers of red, green, and blue are sequentially stacked on the black matrix on the color filter substrate corresponding to the gate pad and the data pad region of the array substrate.

In addition, the color filter manufacturing method according to another embodiment of the present invention,

Applying a synthetic resin-based material on the transparent insulating substrate, and exposing and etching the same to form a lattice-shaped black matrix;

A color filter layer of red (R), green (G), and blue (B) is sequentially formed in an empty space corresponding to the active region of the array substrate of the black matrix, wherein the color region corresponding to the pad region of the array substrate Stacking and forming a color filter layer of red (R), green (G), and blue (B) on the black matrix formed on the transparent insulating substrate edge region;

Applying a protective film on the transparent insulating substrate on which the black matrix and the color filter layer are formed; And

Forming an overcoat layer on the transparent insulating substrate coated with the protective film for planarization; Characterized in that it comprises a.

Here, two or more layers of red, green, and blue are stacked on the black matrix on the transparent insulation substrate corresponding to the pad region of the array substrate, and black on the transparent insulation substrate corresponding to the pad region of the array substrate is formed. The width of the matrix is characterized in that it is formed equal to or smaller than the pad area of the array substrate.

According to the present invention, when the color filter layer is formed in order to improve the low optical density of the resin black matrix formed on the color filter substrate, the light blocking effect is increased by laminating it on the edge resin black matrix. Due to this there is an advantage that can improve the screen quality.

In addition, it is possible to reduce the size of the bezel that is fixedly arranged along the edge in order to fix the liquid crystal panel and the backlight assembly can be manufactured to reduce the size of the liquid crystal display device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3A to 3E are cross-sectional views illustrating a process for manufacturing a color filter substrate of a liquid crystal display according to the present invention.

As shown in FIG. 3A, a lattice black matrix 31 is formed by applying a photosensitive black resin on the transparent upper substrate 30, then exposing and developing the photosensitive black resin.

The black matrix 31 is formed using a photosensitive resin of an acrylic polymer, an azide compound, an acrylate monomer, an organic polymer binder, and a photopolymerization initiator made of a resin material, and is formed on the transparent upper substrate 30. Numeral 31 corresponds to pixels of the active layer on the array substrate, and forms the black matrix 31 along the edge of the upper substrate 30 to prevent light leakage even in the region corresponding to the gate pad and the data pad region. do.

The width of the black matrix 31 formed in the edge region of the transparent upper substrate 30 has a rather wide width, and blocks light leakage generated in the pad region of the array substrate after completion of the liquid crystal panel.

When the black matrix 31 is formed on the transparent upper substrate 30 as described above, as shown in FIG. 2B, color filter layers of red, green, and blue are sequentially formed between the lattice black matrix 31. .

The process of forming each of the red, green, and blue color filter layers is as follows.

In the present invention, when the red, green, and blue color filter layers are formed, the color layers 33a are stacked on the black matrix 31 formed on the edge of the substrate to effectively block light leakage generated in the pad region of the array substrate. Its purpose is to.

A red photosensitive color resin is coated on the black matrix 31 by a known pigment spraying method, and the color filter layer 33 is patterned by exposing and developing the color filter layer, wherein light leakage generated in the pad layer region of the array substrate is removed. A red color layer 33 is stacked on the black matrix formed to block the black matrix.

Then, the red color layer 33a is stacked on the black matrix 31 formed on the edge region while the red color filter layer 33 is formed on the black matrix 31.

As shown in FIG. 3C, a green photosensitive color resin is coated on the entire surface of the transparent upper substrate 30 on which the red color filter layer 33 is formed, and then the green color filter layer 35 is patterned by exposing and developing the same. The green color layer 35a is stacked on the red color layer 33a stacked on the black matrix 31.

Accordingly, the red color layer 33a and the green color layer 35a are stacked on the black matrix 31 of the edge region on the transparent upper substrate 30, and the black matrix 31 is opposed to the active layer of the array substrate. ), The red color filter layer 33 and the green color filter layer 35 are formed.

Similarly, as shown in FIG. 3D, when the blue color filter layer 37 is formed, a blue photosensitive color resin is formed on the transparent upper substrate 30 on which the red color filter layer 33 and the green color filter layer 35 are formed. After coating on the entire surface, it is exposed and developed to pattern the blue color filter layer 37, and the blue color layer on the green color layer 35a stacked on the black matrix 31 on the edge of the upper substrate 30. 37a) is laminated.

Accordingly, red, green, and blue color layers 33a, 35a, 37a are sequentially stacked on the black matrix 31 of the edge region on the transparent upper substrate 30, and the black matrix is opposed to the active layer of the array substrate. On the 31, the red, green, and blue color filter layers 33, 35, 37 are completed.

The width of the black matrix 31 on the color filter substrate corresponding to the pad layer of the gate pad and the data pad region of the array substrate is equal to or smaller than the width of the gate pad or data pad to block light leakage.

Then, as illustrated in FIG. 3E, the transparent upper substrate 30 formed by stacking the red, green, and blue color filter layers 33, 35, and 37 and the red, green, and blue color layers 33a, 35a, and 37a are stacked. The overcoat layer 39 is applied to the planarization work.

Although not shown in the drawing, a transparent common electrode is formed to complete the color filter substrate.

In the process of manufacturing the color filter substrate, the red, green, and blue color layers 33a, 35a, and 37a are not necessarily stacked on the black matrix 31 on the edge region. Alternatively, only one or two color layers may be laminated.

That is, one or two of the red color layer 33a, the green color layer 35a, and the blue color layer 37a may be stacked on the edge black matrix 31.

Since the stacked color layer has a low optical density of the black matrix 31 using a resin-based material, it does not effectively block light leakage generated through the pad layer of the array substrate, thereby stacking the optical density by stacking the color layers. To effectively block light leaks.

4 is a cross-sectional view showing the structure of a liquid crystal display according to the present invention.

As shown in FIG. 4, the liquid crystal display device includes a black matrix 31, color filter layers 33, 35, and 37, and a color layer stacked on the black matrix 31 formed on an edge region. An array substrate including an active layer 53 including a pixel electrode and a switching element formed on the color filter substrate and the lower substrate 50 and a pad layer 51 for applying a driving signal and a graphic signal to the array wiring are formed of a liquid crystal layer. 45) is put together and sandwiched structure.

When the array substrate and the color filter substrate are completed, the seal lines 41 and the spacers are scattered on each of the two substrates, and then bonded, and the liquid crystal is injected and encapsulated.

Therefore, the structure of the liquid crystal cell in which the array substrate and the color filter substrate are bonded together is supported by the seal line 41 supporting two substrates along the edges of the color filter substrate and the array substrate, and formed on the color filter substrate. The color filter layers 33, 35, 37 and the active layer 53 formed on the array substrate have a structure opposite to each other.

Particularly, in the present invention, a structure in which red and green blue color layers 33a, 35a, and 37a are stacked on a color filter substrate facing the gate pad and data pad layer 51 formed on the edge of the array substrate is provided. The backlight light source traveling from the rear surface of the array substrate completely blocks light leakage generated from the pad layer 51 to improve screen quality.

When light leakage is blocked by the stacked color layer, the liquid crystal cell is cut and the liquid crystal panel is completed, and then the size of the bezel used for fixing along the edges for constant optical coupling with the backlight units becomes smaller and thinner. It is possible to manufacture the device in light and small size.

As described in detail above, the present invention has the effect of efficiently blocking light generated in the backlight by stacking a color filter layer on the black matrix in order to increase the low optical density of the resin black matrix.

In addition, the size of the bezel disposed to fix the liquid crystal panel and the backlight assembly while blocking light generated along the pad region of the array substrate may be reduced, thereby making it possible to manufacture a liquid crystal display device having a light and small size.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (8)

Thin film transistors are arranged on the transparent lower substrate so as to vertically cross a gate bus line and a data bus to define a unit pixel region, and a gate pad for applying a signal to the gate bus line and the data bus line, respectively. An array substrate comprising a data pad and a data pad; A black matrix composed of a resin-based material on the transparent upper substrate, a color filter layer of red, green, and blue disposed in each pixel region of the black matrix, and a black corresponding to the gate pad and data pad regions on the array substrate. A color filter substrate composed of color layers stacked on the matrix; And A liquid crystal layer interposed between the array substrate and the color filter substrate to adjust an amount of light transmitted from a backlight; Liquid crystal display comprising a. The method of claim 1, The material of the black matrix is a liquid crystal display device comprising a photosensitive resin of an acrylic polymer, an azide compound, an acrylate monomer, an organic polymer binder and a photopolymerization initiator. The method of claim 1, The width of the black matrix on the color filter substrate corresponding to the gate pad and the data pad area of the array substrate is less than or equal to the width of the gate pad or data pad. The method of claim 1, And at least two color layers of red, green, and blue color layers are stacked on the black matrix on the color filter substrate corresponding to the gate pad and the data pad area of the array substrate. The method of claim 1, And red, green, and blue color layers are sequentially stacked on the black matrix on the color filter substrate corresponding to the gate pad and the data pad region of the array substrate. Applying a synthetic resin-based material on the transparent insulating substrate, and exposing and etching the same to form a lattice-shaped black matrix; A color filter layer of red (R), green (G), and blue (B) is sequentially formed in an empty space corresponding to the active region of the array substrate of the black matrix, wherein the color region corresponding to the pad region of the array substrate Stacking and forming a color layer of red (R), green (G), and blue (B) on the black matrix formed on the transparent insulating substrate edge region; Applying a protective film on the transparent insulating substrate on which the black matrix and the color filter layer are formed; And Forming an overcoat layer on the transparent insulating substrate coated with the protective film for planarization; Color filter substrate manufacturing method comprising a. The method of claim 1, And at least two color layers of red, green, and blue are stacked on the black matrix on the transparent insulating substrate corresponding to the pad region of the array substrate. The method of claim 1, The width of the black matrix on the transparent insulating substrate corresponding to the pad region of the array substrate is smaller than or equal to the pad region of the array substrate.