KR20020034285A - color filter panel and manufacturing method thereof and liquid crystal display including the same - Google Patents

Abstract

PURPOSE: A color filter substrate, a method of fabricating the color filter substrate and a liquid crystal display including the color filter substrate are provided to secure a wide viewing angle of a liquid crystal display and to simplify a process of fabricating the color filter substrate. CONSTITUTION: A liquid crystal display includes the first insulating substrate, a pixel electrode having a plurality of openings, formed on the first substrate, and the second insulating substrate(100) facing the first substrate. The liquid crystal display further includes red, green and blue color filters(110) formed on the second substrate, and a tri-level layer(111,121,131) configured of the three color filters and formed between the color filters. The display also has a common electrode(140) covering the color filters and the tri-level layer, and a black matrix(150) formed between the color filters.

Description

Color filter substrate and manufacturing method thereof, and liquid crystal display including the same

The present invention relates to a color filter substrate, a method of manufacturing the same, and a liquid crystal display including the same.

In general, a liquid crystal display device injects a liquid crystal material between a lower plate on which a thin film transistor, a pixel electrode, and the like are formed, and an upper plate on which a color filter and a common electrode, etc., corresponding to the pixel electrode are formed, and applies a voltage between the two electrodes. It is a device that displays an image by forming an electric field to change the arrangement of liquid crystal molecules, and thereby controlling the transmittance of light.

The LCD has a narrow viewing angle, and various methods have been proposed to overcome this problem. Among them, there is a method in which the liquid crystal molecules are vertically aligned with respect to the upper and lower substrates, and opening patterns or protrusion patterns are formed on the pixel electrode and the common electrode.

When the opening patterns are formed in the two electrodes, the viewing angle can be widened by controlling the direction in which the liquid crystal molecules lie down by using a fringe field formed by the opening pattern when a voltage is applied between the two electrodes.

However, in this case, since the common electrode needs to be patterned, a photolithography process is added, and the adhesion between the ITO common electrode deposited by the sputtering method on the color filter and the color filter resin is poor, so that the precision of the common electrode is poor. . In addition, there is a problem that the color filter is exposed and damaged when the ITO etching, and to prevent this, an overcoat layer is formed on the color filter, which has a problem that the overcoat layer is expensive. In the case of forming the overcoat layer, since the common electrode does not directly contact the black matrix formed of chromium or the like, there is a problem in that the resistance increases and the flicker defect is severe.

On the other hand, when forming the projection pattern there is a problem that the process is added.

The technical problem to be achieved by the present invention is to secure a wide viewing angle.

Another technical problem to be achieved by the present invention is to form a black matrix having excellent insulation characteristics.

Another technical problem to be achieved by the present invention is to simplify the process.

1 is a layout view showing a color filter substrate for a liquid crystal display according to a first embodiment of the present invention;

2 is a cross-sectional view taken along the line II-II in FIG.

3A is a cross-sectional view showing a color filter substrate in a first step of manufacturing according to the first embodiment of the present invention;

3B to 3D are cross-sectional views sequentially showing the processes in the next step of FIG. 3A in the order thereof;

4 is a layout view illustrating a color filter substrate for a liquid crystal display according to a second exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4.

6A is a cross-sectional view illustrating a color filter substrate in a first step of manufacturing according to the second embodiment of the present invention;

FIG. 6B is a sectional view at the next step of FIG. 6A,

7 is a layout view illustrating a color filter substrate for a liquid crystal display according to a third exemplary embodiment of the present invention.

8 is a cross-sectional view taken along line VII-VII in FIG. 7,

9A is a cross-sectional view illustrating a color filter substrate in a first step of manufacturing according to the third embodiment of the present invention;

FIG. 9B is a cross sectional view of the next step of FIG.

10 is a cross-sectional view illustrating a color filter substrate and a thin film transistor substrate corresponding thereto according to the second embodiment of the present invention.

In order to achieve this problem, the present invention forms a black matrix and a projection pattern by using an organic black photosensitive agent including acrylic and pigment.

According to the present invention, a pixel electrode having a plurality of openings is formed on a first insulating substrate, and red, green, and blue color filters are formed on a second insulating substrate facing the first substrate, and three colors are formed between the color filters. A three-layer film formed by stacking filters is formed. The color filter and the three-layer film are covered with a common electrode, and a black matrix is formed between the color filters. At this time, the distance between the first substrate and the second substrate is kept constant by the three-layer film and the black matrix formed thereon.

The black matrix is preferably made of a material including acrylic, pigments of red, green, and blue, and a plurality of protrusion patterns may be further formed on the color filter and made of the same material as the black matrix.

According to the color filter substrate for a liquid crystal display according to the present invention, first, a red, green, and blue color filter is formed on an insulating substrate, and a three-layer film formed of three layers of red, green, and blue color filters is formed between the color filters. Formed. The common electrode is formed on the color filter and the three layer film. It consists of an organic black photosensitive agent, and the black matrix which covers a three layer film is formed between color filters. Here, it is preferable that an organic black photosensitizer contains the pigment of acryl type and red, green, and blue.

In this case, a plurality of protrusion patterns may be further formed on the color filter with the same material as the black matrix, and the color filter may have an opening having the same shape as the protrusion pattern.

The black matrix preferably has a thickness of 2.0 µm to 3.5 µm, an optical density of 3.5, a volume resistance of 10 ¹³ Ωcm to 10 ¹⁴ Ωcm, and a dielectric constant of 4.

Also, it is preferable that the color filter does not overlap the black matrix.

In manufacturing the color filter substrate according to the present invention, first, a red, green, and blue color filter is formed on the insulating substrate, and a three-layer film consisting of three layers of red, green, and blue color filters is formed between the color filters. Next, a common electrode covering the color filter and the three layer film is formed, and a black matrix made of an organic black photosensitive agent and covering the three layer film is formed between the color filters. At this time, the organic black photosensitizer is composed of a pigment of acrylic and red, green, blue.

Here, a plurality of protrusion patterns may be further formed on the color filter using the same material as the black matrix, and openings may be formed on the color filter in the same shape as the protrusion pattern.

In this case, the color filter is preferably formed so as not to overlap the black matrix.

Meanwhile, when the color filter is formed, the alignment key pattern for the encapsulant is formed together, and a short point pattern that does not overlap with the black matrix may be formed together.

In the present invention, when forming a color filter, a three-layer film consisting of three layers of color filters is formed between the color filters, and using the organic black photoresist including acrylic and red, green, and blue pigments having excellent insulating properties, By forming the black matrix and the projection pattern on the color filter, the black matrix on the three-layer film is used as a spacer, and a wide viewing angle can be secured by using the projection pattern.

Then, with reference to the accompanying drawings, a color filter substrate according to an embodiment of the present invention, a manufacturing method thereof, and a liquid crystal display device including the same may be easily implemented by those skilled in the art. It is explained in detail as much.

First, the structure of the color filter substrate for a liquid crystal display according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 is a layout view illustrating a color filter substrate for a liquid crystal display according to a first exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

Red, green, and blue color filters 110, 120, and 130 corresponding to the pixel areas of the lower plate (not shown) are formed on the insulating substrate 100, respectively, and the color is disposed between the color filters 110, 120, and 130. Three-layer films 111, 121, and 131 made of the same material as the filters 110, 120, and 130 are formed. The common electrode 140 made of ITO is formed on the color filters 110, 120, 130, and the three-layer films 111, 121, and 131. A black matrix 150 made of an organic black photosensitive agent is formed in an area except the color filters 110, 120, and 130 on the common electrode 140. At this time, since the three-layer films 111, 121, and 131 are formed higher than the other portions, the height of the black matrix S on the three-layer films 111, 121 and 131 is higher than that of the other portions.

Here, the three-layer films 111, 121, and 131 and the black matrix S thereon may be used as pillar spacers, and the black matrix 150 having excellent insulation properties and preventing light leakage may be formed. .

For this purpose, it is preferable to use a black photosensitive agent obtained by synthesizing pigments of red, green, and blue with high resistance to acrylic. The thickness of the black matrix 150 formed using such a black photosensitive agent is 2.0 μm to 3.5 μm, the optical density for determining the light shielding property is 3.5, and the volume resistance is 10 ¹³ Ω cm to 10 ¹⁴ Ωcm, the dielectric constant is preferably about 4.

Next, a method of manufacturing a color filter substrate for a liquid crystal display according to a first exemplary embodiment of the present invention will be described with reference to FIGS. 3A to 3D and FIGS. 1 and 2.

First, as shown in FIG. 3A, the red color filter 110 and the portion 111 to be a spacer are patterned and cured on the insulating substrate 100.

Next, as shown in FIG. 3B, the green color filter 120 is patterned on the insulating substrate 100, and the green color filter 121 is patterned and cured on the red color filter 111 of the portion to be a spacer. .

Next, as shown in FIG. 3C, the blue color filter 130 is patterned on the insulating substrate 100, and the blue color filter 131 is patterned and cured on the green color filter 121 of the portion to be a spacer. .

Next, as shown in FIG. 3D, a common electrode 140 made of a transparent conductive material such as ITO is formed on the entire surface of the substrate 100.

Next, as shown in FIGS. 1 and 2, the organic black photosensitive agent including acrylic, red, green, and blue pigments is used to exclude the color filters 110, 120, and 130 on the common electrode 140. The black matrix 150 is formed.

Here, when the color filters 110, 120, and 130 are formed, the color filters 110, 120, and 130 are formed in a dot method that is formed only in a portion corresponding to the pixel area of the lower plate. The order of formation of the 120 and 130 may be different. The dot method is a method of forming the color filters 110, 120, and 130 so as not to overlap the black matrix 150. In the case where the black matrix is formed after the black matrix is formed, the black matrix and the color filter overlap with each other. It is possible to prevent affecting the arrangement of the liquid crystal due to the step difference of.

On the other hand, when the red color filter is first formed, the red color filter pattern becomes a reference pattern for the next step, and when forming the red color filter, an alignment key pattern (not shown) for a sealant is also used. Formed together so that the encapsulant is formed without misalignment in subsequent processes. In addition, when the red color filter is formed, a pattern (not shown) for forming a short point connecting the upper and lower plates of the liquid crystal display is also formed in a subsequent process. In this case, since the black matrix 150 is formed after the ITO common electrode 140 is formed, the short point pattern should be formed so as not to overlap the black matrix 150. On the other hand, in the case of forming the green or blue color filter first without forming the red color filter first, the alignment key pattern for the encapsulant is formed in the first color filter process so that the encapsulant is formed without misalignment in the subsequent process. Also, a short point pattern is formed together.

As described above, since the three-layer film made of the color filters 111, 121, and 131 is formed in a columnar shape having a height higher than that of other films, it can be used as a spacer without forming a spacer. In addition, since the black matrix 150 is formed by using an organic black photosensitive agent made by synthesizing acrylic and pigment, the insulating property is excellent and the light blocking property is good.

It is also possible to form a columnar spacer and a projection pattern using such an organic black photosensitive agent. This will be described in the second and third embodiments of the present invention, in which the second and third embodiments form projection patterns while maintaining the effects in the first embodiment.

First, a color filter substrate for a liquid crystal display according to a second exemplary embodiment of the present invention will be described with reference to FIGS. 4 and 5.

4 and 5, the color filter substrate according to the second embodiment of the present invention has a structure substantially the same as that of the first embodiment of the present invention, but the black matrix (top) of the color filter (110, 120, 130) A plurality of protrusion patterns 151, 152, and 153 made of the same material as that of 150 are formed. The function of the projection patterns 151, 152, and 153 will be described later with reference to the drawings.

Here, the protrusion patterns 151, 152, and 153 may use the color filter 110 around the first protrusion 151 and the first protrusion 151, which are formed from the left side to the right side in the middle of the color filter 110. When divided into upper and lower portions, second and third protrusions 152 and 153 are formed at upper and lower portions, respectively. The second and third protrusions 152 and 153 obliquely cross the upper and lower portions of the color filter 110, respectively. The protrusion patterns 151, 152, and 153 are repeatedly formed for each of the red, green, and blue color filters 110, 120, and 130.

As such, the process may be simplified by simultaneously forming the protrusion patterns 151, 152, and 153, the black matrix 150, and the black matrix S serving as the pillar spacer.

Next, a method of manufacturing a color filter substrate for a liquid crystal display according to a second exemplary embodiment of the present invention will be described with reference to FIGS. 6A and 6B and FIGS. 4 and 5.

First, as shown in FIG. 6A, after forming the red color filter 110 and the spacer portion 111, the green and blue color filters 120 and 130 and the same method as in the first embodiment of the present invention. Spacer portions 121 and 131 are formed.

Next, as shown in FIG. 6B, the color filters 110, 120, and 130 and the three-layer films 111, 121, and 131 are covered, and a common electrode 140 made of a transparent conductive material such as ITO is formed.

Next, as shown in FIGS. 4 and 5, the black matrix 150 and the protrusion patterns 151, 152, and 153 are formed using an organic black photosensitive agent including acrylic, red, green, and blue pigments.

Next, a color filter substrate for a liquid crystal display according to a third exemplary embodiment of the present invention will be described with reference to FIGS. 7 and 8.

As shown in FIGS. 7 and 8, the color filter substrate according to the third embodiment of the present invention has a structure substantially the same as that of the second embodiment of the present invention, but the color filters 110, 120, and 130 have protrusion patterns 151. (152, 153) is the same pattern is different.

Next, a method of manufacturing a color filter substrate according to a third exemplary embodiment of the present invention will be described with reference to FIGS. 9A and 9B and FIGS. 7 and 8.

First, as shown in FIG. 9A, a red color filter 110 and a spacer 111 are formed on the insulating substrate 100. In this case, the color filter 110 has an opening 115 having the same shape as the protrusion pattern formed thereafter. Next, the green and blue color filters 120 and 130 and the spacer parts 121 and 131 are formed in the same manner as the first and second embodiments, wherein the color filters 120 and 130 are formed of red color. Similar to the color filter 110, the opening 115 is provided.

Next, as shown in FIG. 9B, a common electrode 140 made of a transparent conductive material such as ITO is formed.

Next, as shown in FIGS. 7 and 8, the black matrix 150 and the protrusion patterns 151, 152, and 153 are formed using an organic black photosensitive agent including acrylic, red, green, and blue pigments.

Next, the functions of the projection patterns 151, 152, and 153 according to the second and third embodiments of the present invention will be briefly described with reference to FIG. 10.

10 is a cross-sectional view illustrating a color filter substrate and a thin film transistor substrate corresponding thereto according to the second embodiment of the present invention.

Herein, the functions of the projection patterns 151, 152, and 153 will be described by using the color filter substrate and the thin film transistor substrate corresponding thereto in the second embodiment, and the functions of the projection patterns 151, 152 and 153 are set to the third. The same applies to the embodiment.

The pixel electrode 20 is formed in the thin film transistor substrate 10, and the pixel electrode 20 has an opening 21. The color filter 110 and the common electrode 140 are formed on the color filter substrate 100, and protrusion patterns 151 and 152 are formed. The liquid crystal 30 is injected between the thin film transistor substrate 10 and the color filter substrate 100, and the protrusion patterns 151 and 152 and the openings 20 of the pixel electrode 20 are alternately disposed. In this case, when a voltage is applied to the pixel electrode 20 and the common electrode 140, an electric field f is formed between the two electrodes 20 and 140, and the liquid crystal 30 is oriented perpendicular to the electric field f. In this case, the electric field f is formed to be inclined with respect to the substrate 10 due to the protrusion patterns 151 and 152 and the opening 20. Through this, the inclination direction of the liquid crystal 30 can be constantly regulated, and a wide viewing angle can be obtained by dispersing the directions in four directions.

Here, the opening 21 is formed in the pixel electrode 20 and the protrusion patterns 151 and 152 are formed on the common electrode 140, but instead of the opening formed in the pixel electrode 20, the pixel electrode 20 is formed. A projection pattern (not shown) having the same planar shape as the opening portion 21 may be formed thereon.

As described above, in the present invention, when forming the color filter, a three-layer film composed of three layers of color filters is formed between the color filters, and the three-layer film is formed by using an organic black photosensitive agent containing acrylic and red, green, and blue pigments having excellent insulating properties. By forming the black matrix on the black matrix and the projection pattern on the color filter, the black matrix on the three-layer film is used as a spacer, and a wide viewing angle can be secured by using the projection pattern.

Claims (19)

First insulating substrate, A pixel electrode formed on the first substrate and having a plurality of openings, A second insulating substrate facing the first substrate, Red, green, and blue color filters formed on the second substrate, A three-layer film formed by laminating the three-color filter between the color filters, A common electrode covering the color filter and the three layer film; Black matrix formed between the color filters Including; And a gap between the first substrate and the second substrate is kept constant by the three layer film and the black matrix formed thereon. In claim 1, The black matrix is a liquid crystal display device made of a material containing acrylic and pigments of red, green and blue. In claim 1, And a plurality of protrusion patterns formed on the color filter and formed of the same material as the black matrix. Insulation board, Red, green and blue color filters formed on the substrate, A three-layer film formed of three layers of the red, green, and blue color filters between the color filters, A common electrode covering the color filter and the three layer film; An organic black photosensitive agent, which is formed between the color filters and covers the three-layer film. Color filter substrate for a liquid crystal display device comprising a. In claim 4, The organic black photosensitive agent is a color filter substrate for a liquid crystal display device containing an acrylic and pigments of red, green, blue. In claim 4, The color filter substrate for a liquid crystal display device further comprising a plurality of protrusion patterns formed on the color filter and the same material as the black matrix. In claim 6, And the color filter has an opening formed in the same shape as the protrusion pattern. In claim 4, The black matrix is a color filter substrate for a liquid crystal display device having a thickness of 2.0㎛ 3.5㎛. In claim 4, The black matrix is a color filter substrate for a liquid crystal display device having an optical density of 3.5. In claim 4, The black matrix has a volume resistance of 10 ¹³ Ωcm to 10 ¹⁴ Ωcm. In claim 4, The black matrix is a color filter substrate for a liquid crystal display device having a dielectric constant of 4. In claim 4, And the color filter does not overlap the black matrix. Forming a color filter of red, green, and blue on the insulating substrate, Forming a three layer film comprising three layers of the red, green, and blue color filters between the color filters; Forming a common electrode covering the color filter and the three layer film; Comprising an organic black photosensitive agent, forming a black matrix covering the three-layer film between the color filter The manufacturing method of the color filter substrate for liquid crystal display devices containing these. In claim 13, The organic black photosensitive agent is a manufacturing method of a color filter substrate for a liquid crystal display device consisting of a pigment of acrylic, red, green, blue. In claim 13, And forming a plurality of protrusion patterns on the color filter using the same material as that of the black matrix. The method of claim 15, A method of manufacturing a color filter substrate for a liquid crystal display device, the method comprising: forming an opening in the color filter in the same shape as the protrusion pattern. In claim 13, And the color filter is formed so as not to overlap with the black matrix. In claim 13, The method of manufacturing a color filter substrate for a liquid crystal display device further comprising the step of forming together the alignment key pattern for the sealant in the step of forming the color filter. In claim 13, And forming a short-circuit pattern that does not overlap with the black matrix in the forming of the color filter.