KR101852635B1 - Color Filter substrate and Method for fabricationg the same - Google Patents

Abstract

The present invention discloses a color filter substrate and a manufacturing method thereof. The color filter substrate of the present invention comprises a substrate, a black matrix formed in a lattice form on the substrate, red (R), green (G), blue (B) An overcoat layer formed on the substrate on which the red (R), green (G), blue (B), and white (W) color filter layers are formed, and an overcoat layer corresponding to the black matrix, And at least two or more patterns of a red color pattern, a green color pattern, and a blue color pattern are laminated between the black matrix and the column spacer.
The color filter substrate and the manufacturing method thereof according to the present invention have the effect of finely adjusting the height of the column spacer by laminating color filter patterns between the black matrix and the column spacer.

Description

[0001] The present invention relates to a color filter substrate and a manufacturing method thereof.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter substrate of a liquid crystal display device, and more particularly, to a color filter substrate capable of adjusting fine steps of a column spacer formed on a color filter substrate and a method of manufacturing the same.

A liquid crystal display (LCD) is an apparatus for displaying an image by adjusting the light transmittance of a liquid crystal using an electric field, and is implemented as an active matrix type in which a switching element is formed for each cell. And is applied to a display device such as a device or a cellular phone.

Such a liquid crystal display device is divided into a vertical electric field type using an electric field in a vertical direction and a horizontal electric field type using an electric field in a horizontal direction in accordance with an electric field direction for driving liquid crystal.

At this time, in the liquid crystal display device of the vertical electric field type, the common electrode formed on the upper substrate and the pixel electrode formed on the lower substrate face each other and the liquid crystal of TN (Twisted Nematic) mode is driven by the vertical electric field formed therebetween do. Such a vertical electric field type liquid crystal display device has a disadvantage that the aperture ratio is large, but the viewing angle is as narrow as 90 degrees.

A horizontal electric field type liquid crystal display device drives a liquid crystal of a plane switch (hereinafter referred to as IPS) mode by a horizontal electric field between a pixel electrode and a common electrode arranged in parallel on a lower substrate. Such a horizontal field-applied liquid crystal display has the disadvantage that the viewing angle is as wide as about 160 degrees, but the aperture ratio is small.

In addition, since the pixel electrode and the common electrode are formed on the lower substrate together with the horizontal electric field type liquid crystal display device, the common electrode is not formed on the color filter substrate like the TN mode liquid crystal display device.

In recent years, a liquid crystal display device has formed a white (W) color filter layer in addition to the red (R), green (G), and blue (B) color filter layers for adjusting the viewing angle, and uses RGBW as one pixel.

 1 is a view showing the structure of a color filter substrate of a liquid crystal display device according to the related art.

Referring to FIG. 1, an opaque metal film or a resin film is formed on a substrate 10 made of a transparent insulating material, and a black matrix 30 is formed according to a mask process. The black matrix 30 is formed in a lattice structure in which regions corresponding to the pixel regions of the array substrate on which the thin film transistors are formed are opened.

In general, a column spacer (CS) is formed on a color filter substrate to hold a cell gap when an array substrate is attached to the color filter substrate. The column spacer CS is formed on a black matrix 30 ) Region.

When the black matrix 30 is formed on the substrate 10 as described above, red (R), green (G) and blue (B) color filter layers 20a, 20b and 20c are sequentially formed, The overcoat layer 40 is formed on the entire surface of the substrate 10. At this time, the white (W) color filter layer 20d is formed by the overcoat layer 40 formed in the region where the color filter layers are not formed, without using a separate white (W) color resin.

When the overcoat layer 40 is formed on the substrate 10 as described above, an insulating layer made of an organic material is formed on the entire surface of the substrate 10, and then an overcoat layer (not shown) formed on the black matrix 30 40). ≪ / RTI > At this time, a column spacer pattern 25 is formed on the overcoat layer 40 above the white (W) color filter layer 20d for planarization.

The conventional color filter substrate has the following problems.

First, the height of the column spacer CS for holding the cell gap by laminating the color filter substrate and the array substrate can not be reduced to a specific thickness or less in terms of material characteristics. For example, it is difficult to reduce the thickness of an organic film used as a column spacer to 2.0 [占 퐉] or less in view of material properties.

Therefore, it is difficult to meet the cell gap conditions which are variously required according to the size of the liquid crystal display device or the model.

Secondly, the thickness of the black matrix BM formed at the lower portion of the column spacer can be adjusted in order to adjust the height of the column spacer CS. However, in this case, the material cost rises.

An object of the present invention is to provide a color filter substrate capable of finely adjusting the height of a column spacer by laminating color filter patterns between a black matrix and a column spacer, and a manufacturing method thereof.

Another object of the present invention is to provide a color filter substrate capable of finely adjusting the cell gap of a liquid crystal display by stacking various types of color filter patterns between a black matrix and a column spacer without an additional process, and a manufacturing method thereof .

According to an aspect of the present invention, there is provided a color filter substrate including a substrate, a black matrix formed in a lattice pattern on the substrate, red (R), green An overcoat layer formed on the substrate on which the red (R), green (G), blue (B) and white (W) color filter layers are formed, And a column spacer formed on the overcoat layer corresponding to the black matrix, wherein at least one of the red color pattern, the green color pattern and the blue color pattern or at least two patterns are laminated between the black matrix and the column spacer .

According to another aspect of the present invention, there is provided a method of manufacturing a color filter substrate including the steps of: providing a substrate; forming an opaque metal film or a resin film on the substrate and forming a black matrix according to a first masking process; Forming a red color photosensitive resin on the formed substrate, forming a red (R) color filter layer in a cell region of a black matrix in accordance with a second mask process, and simultaneously forming a red color pattern on the black matrix, (G) color filter layer is formed on the substrate having the color filter layer formed thereon and a green (G) color filter layer is formed on the cell region of the black matrix according to the third mask process, Forming a blue (B) photosensitive resin on the substrate on which the green (G) color filter layer is formed, and forming a black (B) Forming a blue color pattern on the green color pattern and simultaneously forming a blue color pattern on the green color pattern and a blue color pattern on the overcoat layer on the substrate on which the red (R), green (G), and blue Forming a white (W) color filter layer on the cell region of the black matrix; forming an insulating film of an organic material on the substrate on which the overcoat layer is formed; And forming column spacers on the overcoat layer on which the blue color patterns are laminated.

The color filter substrate and the manufacturing method thereof according to the present invention have the effect of finely adjusting the height of the column spacer by laminating color filter patterns between the black matrix and the column spacer.

In addition, the color filter substrate and the manufacturing method thereof according to the present invention have the effect of finely adjusting the cell gap of the liquid crystal display device by stacking various types of color filter patterns between the black matrix and the column spacer without any additional process.

1 is a view showing the structure of a color filter substrate of a liquid crystal display device according to the related art.
2 is a view showing a structure of a color filter substrate of a liquid crystal display device according to the present invention.
3 is a view for explaining the principle of adjusting the height (step difference) of the column spacer according to the lamination of the color filter patterns according to the present invention.
FIGS. 4A and 4B are views showing the shapes of color filter patterns formed to adjust the height of a column spacer according to the present invention.
Figures 5A-5E illustrate other embodiments for adjusting the height of a column spacer in accordance with the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

2 is a view showing a structure of a color filter substrate of a liquid crystal display device according to the present invention.

Referring to FIG. 2, an opaque metal film or a resin film is formed on a transparent insulating substrate 100, and then a first mask process is performed to form a black matrix 130.

The black matrix 130 is a non-display region of an array substrate (not shown) on which a thin film transistor (TFT), a pixel electrode, a common electrode, a gate line, and a data line are formed, for example a thin film transistor, a gate line, Region is formed.

As described above, when the black matrix 130 is formed on the insulating substrate 100, the red photosensitive color resin is completely deposited on the insulating substrate 100.

Thereafter, a red (R) color filter layer 200a is formed as shown, by performing a photolithography process on the red photosensitive color resin using the second mask. At this time, in the present invention, a red color pattern RP is formed on the black matrix 130 corresponding to the thin film transistor of the array substrate in order to adjust the position of the column spacer CS formed to maintain the cell gap of the liquid crystal display device .

A column spacer CS is formed on the black matrix 130 corresponding to the thin film transistor for maintaining cell gap thereafter. The column spacer CS is formed on the black matrix 130 corresponding to all the thin film transistors, In a range in which the cell gap of the cell is maintained. Therefore, the red color pattern RP is selectively formed only in the region where the column spacer CS is to be formed among the black matrix 130 corresponding to the thin film transistors.

As described above, when the red (R) color filter layer 200a is formed on the insulating substrate 100, the green photosensitive color resin is entirely deposited. Then, a green (G) color filter layer 200b is formed in a cell region (pixel region) partitioned by the black matrix 130 by performing a photolithography process on the green photosensitive color resin using the third mask. At this time, a green color pattern GP is formed on the red color pattern RP on which the column spacer CS is to be formed.

After forming the green (G) color filter layer 200b as described above, the blue photosensitive color resin is entirely deposited on the insulating substrate 100 on the insulating substrate 100. Then, a blue (B) color filter layer 200c is formed in the cell region partitioned by the black matrix 130, as shown in the figure, by performing a photolithography process on the blue resin using the fourth mask. At this time, a blue color pattern BP is formed on the green color pattern GP on which the column spacer CS is to be formed.

The white W color filter layer 200d is formed on the insulating substrate 100. The white color filter layer 200d is formed on the front surface of the insulating substrate 100 without performing a separate mask process, An overcoat layer 240 is formed. That is, the overcoat layer 240 is formed on the insulating substrate 100 on which the color filter layers are formed, and the planarization process is performed. The overcoat layer 240 is filled in the white W cell region, 200d are formed.

As described above, when the overcoat layer 240 is formed on the insulating substrate 100, an insulating film made of an organic material is formed on the entire surface of the insulating substrate 100, and then the red color pattern RP A column spacer CS is formed on the overcoat layer 240 on which the green color pattern GP and the blue color pattern BP are stacked. At this time, a column spacer pattern 250 is formed on the overcoat layer 240 of the white (W) color filter layer 200d for level difference compensation.

In the present invention, three patterns of a red color pattern RP, a green color pattern GP and a blue color pattern BP are laminated in the region where the column spacer CS is formed. However, since this is not fixed, Patterns can be stacked and the height of the column spacer CS can be adjusted.

A red color pattern RP and a blue color pattern BP and a green color pattern GP are formed between the column spacer CS and the black matrix 130. [ And the blue color pattern BP may be laminated. In addition, only one of the red color pattern RP, the green color pattern GP, and the blue color pattern BP can be displayed.

Although the process of forming the red (R) color filter layer 200a, the green (G) color filter layer 200b and the blue (B) color filter layer 200c in order has been described above, (G) color filter layer 200b, a blue (B) color filter layer 200c and a red (R) color filter layer 200a may be sequentially formed. That is, the order of forming the color filter layers of three colors is not predetermined, but may be variously changed as needed.

Accordingly, the order in which the red color pattern RP, the green color pattern GP, and the blue color pattern BP are stacked can also be variously changed according to the order of formation of the color filter layers.

As described above, in the present invention, there is an effect that the height of the column spacer CS can be finely adjusted for maintaining the cell gap required for each size or model of the liquid crystal display device without additional process.

FIG. 3 is a view for explaining the principle of adjusting the height (step difference) of the column spacer according to the lamination of the color filter patterns according to the present invention. FIGS. 4A and 4B are views for explaining a method for adjusting the height of the column spacer according to the present invention And shows the shape of the color filter patterns to be formed.

3, 4A and 4B, a red color pattern RP, a green color pattern GP, and a blue color pattern BP are formed in the region where the column spacer CS is formed in the color filter substrate of the present invention Respectively. The overcoat layer OC formed in Fig. 2 for illustration is not shown. However, an overcoat layer may be formed on the stacked color patterns.

The red color pattern RP, the green color pattern GP, and the blue color pattern BP are fixed to a specific thickness for each color coordinate implementation. Therefore, when both the red color pattern RP, the green color pattern GP and the blue color pattern BP are stacked, when either of them is stacked in combination and when the respective patterns are formed, CS) is finely changed.

By using such physical characteristics, the height of the column spacer CS can be finely adjusted without further processing in the present invention, and the cell gap of the liquid crystal display device can be variously adjusted.

4A and 4B, the red color pattern RP, the green color pattern GP, and the blue color pattern BP formed on the color filter substrate of the present invention are circular, oval, square, Rhombic, trapezoidal, cruciform, lattice pattern, and the like.

For example, as shown in FIG. 2, a red color pattern RP, a green color pattern GP, and a blue color pattern BP, which are laminated between a column spacer CS and a black matrix BM, The diameter of the red color pattern RP formed at the bottom side is made largest and the diameter gradually decreased toward the green color pattern GP and the blue color pattern BP.

4B, the shapes of the red color pattern RP, the green color pattern GP, and the blue color pattern BP may be formed in a cross shape and stacked so that they are staggered from each other.

As described above, the height of the column spacer CS can additionally be adjusted by changing the shape of the red color pattern RP, the green color pattern GP, and the blue color pattern BP. That is, when the red color patterns RP, the green color patterns GP, and the blue color patterns BP having the different thicknesses are laminated in the same shape, the height of the column spacers CS is changed by the sum of these thicknesses 4A and FIG. 4B, it is possible to additionally realize a finely changed thickness instead of a simple sum thickness of the stacked patterns.

That is, by varying the order of lamination of the red color pattern RP, the green color pattern GP and the blue color pattern BP, the number of lamination patterns, the size or diameter of each of the patterns, Can be adjusted.

Figures 5A-5E illustrate other embodiments for adjusting the height of a column spacer in accordance with the present invention.

5A to 5E, grooves may be formed in any one of the red color pattern RP, the green color pattern GP and the blue color pattern BP in FIGS. 4A and 4B, Even when the diameter and shape are changed irregularly rather than changing the size of the diameter or the shape, a finely laminated thickness variation occurs.

5A, when a groove having a first width L1 is formed at the center of the red color pattern RP, a green color pattern GP (for example, ) And the blue color patterns (BP) are stacked.

Thus, the height of the column spacer CS can be finely adjusted. In addition, although not shown in the drawing, the height of the column spacer CS can be further modified by the above-mentioned elements because an overcoat layer is formed on top of the stacked patterns as shown in FIG.

5B, a red color pattern RP, a green color pattern GP, and a blue color pattern BP are laminated, and the center of the blue color pattern BP stacked on the upper side is formed by the same method, The height of the column spacer CS, which is different from that of FIG. 5A, can be realized.

5C to 5E, the blue color pattern BP among the red color pattern RP, the green color pattern GP, and the blue color pattern BP is only the lower green color pattern GP Or the red color pattern RP and the green color pattern GP are formed so as to surround each of the red color patterns RP and the green color patterns GP. As a result, the height of the column spacer CS can be maintained at a slightly different height, and thus the cell gap can be changed in the liquid crystal display device.

The color filter substrate and the manufacturing method thereof according to the present invention have the effect of finely adjusting the height of the column spacer by laminating color filter patterns between the black matrix and the column spacer.

In addition, the color filter substrate and the manufacturing method thereof according to the present invention have the effect of finely adjusting the cell gap of the liquid crystal display device by stacking various types of color filter patterns between the black matrix and the column spacer without any additional process.

100: insulating substrate 130: black matrix
200a: red (R) color filter layer 200b: green (G) color filter layer
200c: blue (B) color filter layer 240: overcoat layer
250: Column spacer pattern RP: Red color pattern
GP: Green color pattern BP: Blue color pattern
CS: Column spacer

Claims (13)

A substrate;
A black matrix formed in a lattice form on the substrate,
(R), green (G), blue (B), and white (W) color filter layers formed in each cell region partitioned by the black matrix,
An overcoat layer formed on the substrate on which the red (R), green (G), blue (B) and white (W) color filter layers are formed,
And a column spacer formed on the overcoat layer corresponding to the black matrix,
At least two or more patterns of a red color pattern, a green color pattern and a blue color pattern are stacked between the black matrix and the column spacer,
Wherein the at least two patterns are formed in a cross shape and are stacked so as to be staggered with each other,
Wherein at least one of the red color pattern, the green color pattern, and the blue color pattern is formed with a groove in the center,
The groove overlapping the black matrix and the column spacer.
The color filter substrate of claim 1, wherein the white (W) color filter layer is formed of the overcoat layer.
3. The color filter substrate of claim 2, further comprising a column spacer pattern for level difference compensation on the white (W) color filter layer.
delete delete delete delete Providing a substrate;
Forming an opaque metal film or a resin film on the substrate and forming a black matrix according to a first masking process;
Forming a red color photosensitive resin on the substrate on which the black matrix is formed and forming a red color filter layer in a cell region partitioned by the black matrix according to a second mask process and forming a red color filter layer on the black matrix, Forming a pattern,
Forming a green (G) photosensitive resin on the substrate on which the red (R) color filter layer is formed, forming a green (G) color filter layer in a cell region partitioned by the black matrix according to a third mask process, Forming a green color pattern on the red color pattern;
(B) photosensitive resin is formed on the substrate on which the green (G) color filter layer is formed, a blue (B) color filter layer is formed in the cell region partitioned by the black matrix in accordance with the fourth mask process, Forming a blue color pattern on the green color pattern;
Forming an overcoat layer on the substrate on which the red (R), green (G), and blue (B) color filter layers are formed to form a white (W) color filter layer in the cell region partitioned by the black matrix; ,
Forming an insulating layer of an organic material on the substrate on which the overcoat layer is formed, and forming a column spacer on the overcoat layer in which the red, green, and blue color patterns are stacked according to a fifth mask process,
The red color pattern, the green color pattern, and the blue color pattern are formed in a cross shape and are stacked so as to be interlaced with each other,
Wherein at least one of the red color pattern, the green color pattern and the blue color pattern has a groove formed at the center thereof,
Wherein the groove overlaps the black matrix and the column spacer.
9. The method of claim 8, wherein forming the column spacer comprises forming a column spacer pattern for level difference compensation on the white (W) color filter layer.
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