KR101541354B1 - Color filter substrate for liquid crystal display device - Google Patents

Abstract

The present invention provides a liquid crystal display device comprising: a black matrix formed on a substrate having a plurality of pixel regions defined therein and having a constant thickness and capturing the plurality of pixel regions and formed in a lattice form; And a color filter pattern formed on the black matrix and the pixel region, wherein the black matrix forms an open structure by forming a plurality of openings having a first interval with respect to the plurality of pixel regions, A color filter substrate is provided.

Color filter substrate, liquid crystal display device, roll printing device, black matrix, air layer

Description

[0001] The present invention relates to a color filter substrate for a liquid crystal display,

The present invention relates to a liquid crystal display device, and more particularly, to a color filter substrate for a liquid crystal display device having a black matrix structure capable of minimizing defects by a printing method and a method of manufacturing the same.

Recently, as the information society has developed rapidly, there has been a need for a flat panel display having excellent characteristics such as thinness, light weight, and low power consumption. Among them, a liquid crystal display Color display, and picture quality, and is actively applied to a notebook or desktop monitor.

In general, a liquid crystal display device has a structure in which two substrates, each having electrodes formed on one side thereof, are disposed so as to face the surface on which the electrodes are formed, liquid crystal is injected between the two substrates, And the liquid crystal molecules are moved by the electric field generated by the application of the electric field, thereby expressing the image by the transmittance of the light depending on this.

1, which is an exploded perspective view of a general liquid crystal display device, a liquid crystal layer 30 is interposed between the array substrate 10 and the color filter substrate 20, The lower array substrate 10 has a first transparent substrate 12 and a plurality of gate wirings 14 arranged longitudinally and laterally crosswise on the upper surface thereof to define a plurality of pixel regions P, And a data line 16. A thin film transistor Tr is provided at an intersection of these two lines 14 and 16 and is connected in a one-to-one correspondence with the pixel electrode 18 provided in each pixel region P.

The upper portion of the color filter substrate 20 faces the second transparent substrate 22 and the rear surface of the second transparent substrate 22 to cover the non-display regions of the gate wiring 14, the data wiring 16, the thin film transistor Tr, A black matrix 25 in the form of a lattice surrounding each pixel region P is formed and the black matrix 25 having red, And a color filter layer 26 including blue color filter patterns 26a, 26b and 26c are formed on the surface of the color filter layer 26. A transparent common electrode 28 is provided over the entire surface of the black matrix 25 and the color filter layer 26 .

Although not clearly shown in the figure, these two substrates 10 and 20 are covered with a sealant or the like along their edges in order to prevent leakage of the liquid crystal layer 30 interposed therebetween, 20 and the liquid crystal layer 30 are interposed between the liquid crystal layer 30 and the liquid crystal layer 30, and a polarizing plate is attached to at least one outer surface of each of the substrates 10, 20.

In addition, a back light is provided on the back surface of the liquid crystal panel to supply light. On / off signals of the thin film transistor Tr are sequentially scanned by the gate wiring 14, When the image signal of the data line 16 is transferred to the pixel electrode 18 of the pixel region P, the liquid crystal molecules therebetween are driven by the vertical electric field therebetween. As a result, Can be displayed.

In the liquid crystal display device having such a configuration, the color filter layer in the color filter substrate is manufactured through a pigment dispersion method, a dyeing method, an electrodeposition method, or a thermal transfer method. In general, the pigment dispersion method has excellent precision and reproducibility and is widely used .

However, the production of the color filter layer by the pigment dispersion method requires repeated manufacturing processes such as application of color resist, exposure, development, curing, and the like three times. Therefore, many equipment is needed, It is long and complicated, takes a long time to manufacture, and finally has a problem in that the manufacturing cost rises.

Therefore, in order to solve the problems of manufacturing the color filter substrate by the pigment dispersion method described above, a method of manufacturing a color filter layer by a printing method using a roll printing apparatus has been proposed and used.

The printing method using the roll printing apparatus includes a printing plate called a clincher having a groove corresponding to a portion to be removed of the color resist formed on the surface of the roll in a state in which red, So as to form a patterned color resist pattern on the roll surface. Then, the color resist pattern is rotated while being in contact with the surface of the color filter substrate, and the color resist pattern remaining on the roll surface is transferred to the color filter substrate to form a color filter pattern.

2, which is a plan view showing a part of the color filter substrate before forming the color filter pattern in the conventional liquid crystal display device, the color filter pattern on the substrate by the roll printing apparatus is formed on the color filter substrate (Black matrix) 25 in a state in which a black matrix 25 having a predetermined thickness (1 탆 to 1.5 탆 in the case of black resin) and surrounding each pixel region P is formed on the substrate 20, Since the color resist pattern is transferred from the roll surface to each pixel region P, the air can not finally escape into each pixel region P, and an air layer is formed, whereby the black matrix 25, or the color resist is clumped, the color filter pattern is not normally formed, lifting occurs Or the pattern is moved by the lifting, resulting in the formation of a pattern on an undesired portion.

3 is a photograph showing a color filter pattern formed on a color filter substrate on which a black matrix of a conventional closed structure is formed through a roll printing apparatus.

Referring to the drawings, when a color filter pattern is formed through a roll printing apparatus in a color filter substrate having a black matrix of a closed structure, an air layer is formed at the end of each pixel region, thereby causing a defect.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a black matrix having a structure in which an air layer is not formed in each pixel region even if a color filter pattern is formed by applying a printing method using a roll printing apparatus It is another object of the present invention to provide a color filter substrate and further to prevent defects caused by air layer formation at the time of color filter pattern printing.

According to an aspect of the present invention, there is provided a color filter substrate for a liquid crystal display, comprising: a black matrix having a predetermined thickness on a substrate defining a pixel region and capturing the pixel region and having four side walls; ; And a color filter pattern formed on the black matrix and the pixel region, wherein the four sidewalls of the black matrix are formed with a plurality of grooves in the form of grooves having a first interval.

It is preferable that the number of the openings is 1 to 4, and the first interval is 5 탆 to 10 탆.

Wherein the plurality of openings are formed in such a manner that the upper and lower portions of the black matrix that are parallel and facing each other in the black matrix for capturing the pixel region are referred to as a first pattern and the left and right portions are referred to as a second pattern, The first and second patterns are spaced apart from each other at the first interval so that the first and second patterns do not intersect at least one intersection with respect to the intersection when the pattern is extended.

According to another aspect of the present invention, there is provided a color filter substrate for a liquid crystal display, comprising: a substrate on which a plurality of pixel regions are defined, a first portion having a first thickness and continuously capturing each of the pixel regions, A black matrix composed of a second portion having a thin second thickness; And a color filter pattern formed on the black matrix and the pixel region, wherein each of the black matrices capturing each pixel region seamlessly includes a first portion and a second portion along a direction of capturing each pixel region, It is characterized by being connected and configured.

The first thickness is 1 탆 to 1.5 탆, the second thickness is at least 0.5 탆, and the second thickness is 0.5 탆 to 1 탆 less than the first thickness.

And the second portion has a first width of 5 占 퐉 to 10 占 퐉.

A common electrode is formed on the color filter pattern as a transparent conductive material, or an overcoat layer is formed as an organic insulating material.

In the present invention, when the color filter pattern is formed through the roll printing apparatus, the air filling the color filter pattern can be discharged through the opening formed in the black matrix or the thin region. There is an effect of preventing defects such as bunching of color resist, bursting of black matrix, floating of color filter pattern and the like.

In addition, the color filter pattern is formed without defects through the roll printing apparatus, thereby reducing the manufacturing cost of the color filter substrate.

 Hereinafter, a method of manufacturing a color filter substrate by a printing method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

4 is a plan view of a part of a color filter substrate for a liquid crystal display according to a first embodiment of the present invention.

As shown in the figure, the color filter substrate 110 for a liquid crystal display according to the present invention has a certain thickness in a lattice shape, i.e., surrounding each pixel region P, and a black matrix 135 is formed as a black resin have. At this time, the black matrix 135 is characterized in that at least one broken portion exists for each pixel region P and has an opening op. That is, the black matrix surrounding each pixel region P is formed in an open structure having at least one opening op without forming a closed structure unlike the conventional color filter substrate. At this time, it is preferable that the portion where the break occurs in the black matrix 135 surrounding each pixel region P is a portion where no light leakage occurs after the liquid crystal display device is constructed. In the drawing, a plurality of first patterns 120a and 120b extending in a first direction and a plurality of second patterns 130a and 130b extending in a second direction perpendicular to the first direction intersect with each other The second patterns 130a and 130b extending in the second direction with respect to the first patterns 120a and 120b are spaced apart by a predetermined distance to form an opening op.

At this time, the black matrix 135 formed in the pixel region P has a thickness of 1 탆 to 1.5 탆 when formed of a black resin, and the width of the opening op ranges from 5 탆 to 10 탆, The characteristics of each model of the array substrate are determined.

5A to 5E are plan views showing various forms of a black matrix having an opening for one pixel region of a color filter substrate according to a first embodiment of the present invention.

4, in the black matrix 135 surrounding one pixel region P, the first and second patterns 130a and 130b are separated from the first pattern 120a located at the upper side, (5 占 퐉 to 10 占 퐉), but the present invention is not limited to such a black matrix structure but can be variously modified.

As shown in FIG. 5A, both ends of the second patterns 130a and 130b corresponding to the two upper and lower first patterns 120a and 120b are spaced apart from each other by a predetermined distance and have four openings op .

5b and 5c, the ends of the first patterns 120a and 120b are separated from each other by a predetermined distance with respect to the second patterns 130a and 130b located on the left or right side, Or both ends of the first patterns 120a and 120b are separated from each other by a predetermined distance with respect to each of the two second patterns 130a and 130b located on the left and right sides as in 5d, Or the like.

In addition, as shown in Fig. 5E, the position of the aperture " op " may be located at a diagonal position with respect to one pixel region P. [ That is, the shape of the opening 120 between the upper first pattern 120a and the left second pattern 130a and the opening op between the lower first pattern 120b and the right second pattern 130b Or may form an opening op in the opposite diagonal position, although not shown in the drawing.

Other than the black matrix 135 shown in FIGS. 5A to 5E, the pixel region P may be modified to have a shape having at least one opening op without having a closed structure surrounding one pixel region P.

Hereinafter, the cross-sectional structure of the color filter substrate for a liquid crystal display according to the present invention including the black matrix having the above-described planar structure will be described.

FIG. 6 is a cross-sectional view of the portion taken along the section line VI-VI of FIG. 4; FIG.

A black matrix 135 having a planar structure as described above is formed on the substrate 110 with a predetermined width and thickness and a portion of each pixel region P captured by the black matrix 135 and a portion Green, and blue color filter patterns 140a, 140b, and 140c are formed on the black matrix 135 including the first patterns 120a and 120b surrounding the captured portion and the second patterns 130a and 130b . At this time, a white color filter pattern (not shown) may be additionally formed in addition to the red, green, and blue color filter patterns 140a, 140b, and 140c. At this time, the red, green, and blue color filter patterns 140a, 140b, and 140c are sequentially repeated for each pixel region P. The color filter patterns 140a, 140b, and 140c are formed by a printing method through a roll printing apparatus. Wherein air in the pixel region P is supplied to the black matrix (P) when each color filter pattern (140a, 140b, 140c) in each pixel region (P) rotates and contacts the substrate Opposed to the color filter patterns 140a, 140b, and 140c, or the pressure of the air layer formed, or the black matrix 135 is broken due to the pressure of the formed air layer, There is no defect such as lump of the color resist which is a material of the resist layer.

A common electrode 150 is formed on the entire surface of the red, green, and blue color filter patterns 140a, 140b, and 140c as a transparent conductive material, or the common electrode 150 is formed on the array substrate An overcoat layer (not shown) having a flat surface for protecting the color filter patterns 140a, 140b and 140c is formed as an organic insulating material. Alternatively, an overcoat layer (not shown) and a common electrode 150 may be sequentially formed on the red, green, and blue color filter patterns 140a, 140b, and 140c.

7 is a plan view of one pixel region P of the liquid crystal display device constructed using the color filter substrate according to the first embodiment of the present invention.

As shown in the figure, in the liquid crystal display device 101, the gate lines 155 and the data lines 165 are formed on the array substrate, and the pixel regions P are defined. A gate electrode 158 connected to the gate wiring 155, and an active layer (not shown) and an ohmic contact (not shown) are formed inside each pixel region P near a point crossing the gate and data lines 155 and 165, A thin film transistor (not shown) including a semiconductor layer (not shown) having a gate electrode (not shown), a source electrode 167 connected to the data line 165, and a drain electrode 169 spaced apart from the source electrode 167 Tr) are formed. In each pixel region P, a pixel electrode 172 is formed to be connected to the drain electrode 169 of the thin film transistor Tr. In this case, although the pixel electrodes 172 are formed in a plate shape in the drawing, they may be formed in a plurality of bars spaced apart from each other by a predetermined distance according to the characteristics of the liquid crystal display device 101. In this case, A plurality of common electrodes (not shown) may be further formed between the pixel electrodes (not shown) in the form of bar spaced apart.

The color filter substrate is formed so as to face the array substrate having such a configuration. At this time, a black matrix 135 having a plurality of openings op is formed in the color filter substrate so as to cover the gate and data lines 155 and 165 and the thin film transistors Tr, Green, and blue color filter patterns (not shown) corresponding to the pixel regions P are formed.

The black matrix 135 has a width corresponding to that of the data lines 165 and is spaced apart from the data lines 165 and spaced apart from the data lines 165 on both sides of the data lines 165. [ And the ends of the formed pixel electrodes 172 overlap.

One end of the gate line 155 is located at a portion where the gate line 155 is formed and the other end of the gate line 155 is spaced apart from the gate line 155 The pixel electrode 172 is formed to overlap with the end of the pixel electrode 172 formed by the pixel electrode 172. At this time, the opening (op) formed by the breakage of the black matrix 135 is located on the gate wiring 155 more precisely at the intersection of the gate wiring 155 and the data wiring 165. Accordingly, since the opening op in the black matrix 135 is overlapped with the gate line 155, light emitted from the lower backlight unit (not shown) is blocked by the gate line 155, It can be seen that light leakage does not occur through the opening op of the light source 135.

The position of the aperture (op) of the black matrix 135 can be variously modified as shown in Figs. 4 and 5a to 5e. The color filter substrate including the black matrix 135 having the opening position opposed to the model of the liquid crystal display device 101 is suitably applied so that the opening op becomes the thin film transistor Tr, Or the data line 165 to prevent light leakage.

≪ Embodiment 2 >

FIG. 8 is a plan view of a part of a color filter substrate for a liquid crystal display according to a second embodiment of the present invention, and FIG. 9 is a cross-sectional view of a portion taken along a cutting line IX-IX of FIG.

Referring to Fig. 8, the color filter substrate 210 for a liquid crystal display according to the second embodiment of the present invention has the same state as that of a conventional color filter substrate for a liquid crystal display in plan view. In other words, the black mattress 235 surrounding each pixel region P is formed in a closed structure without opening, as in the conventional case.

However, referring to FIG. 9, the cross-sectional structure thereof is distinct from the conventional color filter substrate. That is, the black matrix 235 formed on the color filter substrate 210 according to the second embodiment of the present invention has a sectional structure different from that of the black matrix formed on the conventional color filter substrate.

In the color filter substrate 210 for a liquid crystal display according to the second embodiment of the present invention, the black matrix 235 has the same thickness as the black matrix 234, (Hereinafter referred to as " first region A ") is formed. That is, most of the area surrounding the pixel area P is formed with a first thickness t1 selected within the range of 1 占 퐉 to 1.5 占 퐉, 1 with a second thickness t2 having a value of 0.5 m to 1 m smaller than the thickness t1 and a size of at least 0.5 m or more.

At this time, it is preferable that the width of the first region A is formed to be the same as the width of the opening (op in FIG. 4) described in the first embodiment, that is, about 5 to 10 .mu.m. On the other hand, the position of the first region A may be any portion surrounding one pixel region P since the black matrix 235 has a structure in which all of the black matrix 235 is formed without a break even if its thickness is reduced . However, since the first region A is thinner than other regions, the optical density value for blocking light is relatively small. Therefore, in order to completely block the light, 5A to 5E, more precisely at a portion overlapping the gate wiring, the data line, or the thin film transistor in the liquid crystal display device configuration.

Green, and blue color filter patterns 240a, 240b, and 240c and selectively white color filter patterns 240a and 240b are formed on the black matrix 235 having such a structure and in each pixel region P surrounded by the black matrix 235. [ (Not shown). At this time, the red, green, and blue color filter patterns 240a, 240b, and 240c are sequentially repeated for each pixel region P.

   A common electrode 250 may be formed on the entire surface of the color filter layer 240 including the red, green and blue color filter patterns 240a, 240b and 240c as a transparent conductive material, 250 are formed on the array substrate, an overcoat layer (not shown) having a flat surface for protecting the color filter patterns 240a, 240b, 240c is formed as an organic insulating material. Alternatively, an overcoat layer (not shown) and a common electrode 150 may be sequentially formed on the red, green, and blue color filter patterns 240a, 240b, and 240c.

Also in the case of the color filter substrate 210 having the black matrix 235 structure according to the second embodiment described above, when the color filter patterns 240a, 240b and 240c are formed through the printing method using the roll printing apparatus The black matrix 235 is broken and the color filter patterns 240a, 240b, 240c, 240d, 240d, 240d, 240d, 240d, 240d, 240c do not occur.

<Manufacturing Method>

Hereinafter, a method of manufacturing a color filter substrate having the above-described structure according to the present invention will be briefly described. Here, for convenience of explanation, the color filter substrate will be described with reference to the method of manufacturing the color filter substrate according to the first embodiment.

10A to 10E are process diagrams for the steps of manufacturing a color filter substrate for a liquid crystal display according to a first embodiment of the present invention.

10A, a black resin layer is applied on a transparent substrate 110 to form a black resin layer (not shown), exposure is performed using an exposure mask, and the exposed black resin layer (not shown) The black matrix 135 having the shapes of FIGS. 4 and 5A to 5E, that is, the black matrix 135 having the plurality of openings op surrounding each pixel region P is formed. At this time, the black matrix 135 surrounding each pixel region P is formed to have the same thickness (1 탆 to 1.5 탆).

On the other hand, in the case of forming the black matrix according to the second embodiment, although not shown in the drawing, after forming the black resin layer, diffraction exposure or halftone exposure in which the amount of light reaching the black resin layer is adjusted for each region A portion where a plurality of first regions having a second thickness thinner than the first thickness are formed so as to have a first transmittance amount corresponding to a portion where the black matrix of the first thickness except for the first region is to be formed, And a second thin layer having a second thickness smaller than that of the first region by performing exposure so that light does not reach corresponding to the other region and developing the second region with a second transmittance smaller than the first transmittance, A black matrix having a first thickness can be formed. In this case, the first thickness is 1 탆 to 1.5 탆, the second thickness is 0.5 탆 or more, and the second thickness is 0.5 탆 to 1 탆 less than the first thickness.

Next, as shown in FIGS. 10B and 10C, a color resist 115 is coated on the entire surface of the roll 180 in the roll printing apparatus, and the color resist 115 is coated on the entire surface of the roll 180, The color resist 115 coated on the region other than the portion corresponding to the groove ha of the clean body 185 is rotated by contacting the color resist 115 with the roll coated on the surface of the roll 180, . In this case, only the color resist of any one of red, green, and blue colors remains on the surface of the roll 180 with a predetermined pattern 117. A color pattern 117 of one color is typically formed in a plurality of stripes on the roll 180 surface.

Next, as shown in Fig. 10D, the roll 180 on which the stripe-type color pattern 117 is formed is aligned with the substrate 110 on which the black matrix 135 having the plurality of openings op is formed A color filter pattern 140 of any one of red, green and blue is formed on the substrate 110 on which the black matrix 135 is formed by contacting the substrate 110 and rotating in one direction. At this time, the printing of the color filter pattern 140 through the roll printing apparatus is performed such that the color filter pattern 180 is gradually brought into contact with the pixel region P with a time lag by the rotation of the roll 180, The filter pattern 140 contacts the substrate 110 and the black matrix 135 and fills each pixel region P so that the air in each pixel region P is divided into a plurality of openings And exits through an op. Therefore, since the air can completely escape from each pixel region P, there is no problem caused by the fact that air can not escape as in the prior art.

Although not shown in the drawing, a color filter pattern using the same printing method as described above can be formed on the substrate on which the black matrix according to the second embodiment is formed. At this time, too, air can escape through the first region having a small thickness It is possible to prevent the defective color filter pattern caused by the air layer.

Then, the red, green, and blue color filter patterns 140 are formed on the substrate on which the black matrix 135 is formed by repeating the above-described processes of FIGS. 10B to 10D twice. Green, blue, and white color filter patterns (not shown) can be formed by repeating this process three times when forming a white color filter pattern (not shown).

Next, as shown in FIG. 10E, the common electrode 150 is formed by depositing a transparent conductive material on the substrate 110 on which the red, green, and blue color filter patterns 140 are formed, The color filter substrate 110 can be completed by forming an overcoat layer (not shown) whose surface is flat. Or by forming the overcoat layer (not shown) and forming the common electrode 150 on the overcoat layer (not shown).

    The embodiment of the present invention is merely an example, and various modifications and changes may be made without departing from the spirit of the invention.

1 is an exploded perspective view of a general liquid crystal display device.

2 is a plan view showing a part of a color filter substrate before a color filter pattern is formed in a conventional liquid crystal display device.

Fig. 3 is a photograph showing a color filter pattern formed on a color filter substrate on which a black matrix of a conventional closed structure is formed through a roll printing apparatus. Fig.

4 is a plan view of a part of a color filter substrate for a liquid crystal display according to the first embodiment of the present invention.

5A to 5E are plan views showing various forms of a black matrix having an opening to one pixel region of a color filter substrate according to a first embodiment of the present invention.

FIG. 6 is a cross-sectional view of a portion of FIG. 4 taken along line VI-VI; FIG.

7 is a plan view of one pixel region of a liquid crystal display device constructed using the color filter substrate according to the first embodiment of the present invention.

8 is a plan view of a part of a color filter substrate for a liquid crystal display according to a second embodiment of the present invention.

Fig. 9 is a cross-sectional view of a portion cut along line IX-IX of Fig. 8; Fig.

FIGS. 10A to 10E are process charts showing steps of manufacturing a color filter substrate for a liquid crystal display according to a first embodiment of the present invention; FIGS.

Description of the Related Art

110: substrate 135: black matrix

op: aperture

Claims (9)

delete delete delete delete A black matrix composed of a first portion having a first thickness and a second portion having a second thickness which is thinner than the first thickness, and continuously capturing each of the pixel regions on a substrate on which a plurality of pixel regions are defined; The color filter pattern formed on the black matrix and the pixel region Wherein each of the black matrices capturing each pixel region seamlessly connects the first portion and the second portion along a direction of capturing each of the pixel regions, Wherein at least two or more pixel regions are provided in the pixel region, and at least one of the pixel regions is disposed on each of the right and left sides or the upper and lower sides facing each other. 6. The method of claim 5, Wherein the first thickness is 1 占 퐉 to 1.5 占 퐉, the second thickness is at least 0.5 占 퐉, and the second thickness is 0.5 占 퐉 to 1 占 퐉 smaller than the first thickness. 6. The method of claim 5, And the second portion has a first width. 8. The method of claim 7, And the first width is 5 占 퐉 to 10 占 퐉. 6. The method of claim 5, Wherein a common electrode is formed on a front surface of the color filter pattern as a transparent conductive material or an overcoat layer is formed as an organic insulating material.

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