KR100975772B1 - Color filter substrate, method of manufacturing the same and liquid crystal display device including the same - Google Patents

Abstract

Disclosed are a color filter substrate, a method of manufacturing the same, and a liquid crystal display including the same, for improving productivity as well as optical characteristics. The color filter of the liquid crystal display includes a substrate on which black matrices partitioning the R, G, B, and W display areas is formed, and R, G, and B color filters provided in the R, G, and B display areas, respectively. A first organic film pattern provided in the W display area and having the same height as the R, G, and B color filters, and a second organic film pattern defining the thickness of the liquid crystal layer. In addition, a common electrode provided on the R, G, and B color filters and the first organic layer pattern is included. Therefore, the color filter substrate having the above-described configuration can be applied to manufacturing a liquid crystal display device of four colors for improving optical properties and improving productivity.

Description

COLOR FILTER SUBSTRATE, METHOD OF MANUFACTURING THE SAME AND LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME}

1 is a perspective view schematically showing a pixel of a color filter substrate according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the color filter substrate shown in FIG. 1 taken along a line A-A '.

3 is a perspective view schematically illustrating a pixel of a color filter substrate according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of the color filter substrate shown in FIG. 3 taken along the line BB ′.

5A to 5E are cross-sectional views illustrating a method of manufacturing a color filter substrate according to a third exemplary embodiment of the present invention.

6A to 6G are cross-sectional views illustrating a method of manufacturing an array substrate according to a fourth exemplary embodiment of the present invention.

7 is a schematic cross-sectional view of a liquid crystal display according to a fifth exemplary embodiment of the present invention.

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

100: glass substrate 102: black matrix                 

104: red color filter 106: green color filter

108: blue color filter 110a: first organic film pattern

110b: second organic layer pattern 112a: common electrode

120: color filter substrate 125: exposure mask

The present invention relates to a color filter substrate, a method for manufacturing the same, and a liquid crystal display device including the same, and more particularly, a four-color color filter substrate for improving productivity and a productivity, and a method for manufacturing the same. It relates to a liquid crystal display device.

In today's information society, the role of electronic display devices becomes more and more important, and various electronic display devices are widely used in various industrial fields. Among the various display devices currently developed, the liquid crystal display device is thinner and lighter than other display devices, has a low power consumption and a low driving voltage, and is widely used in various electronic devices due to the image display close to the cathode ray tube. It is used.

The liquid crystal display device includes a first substrate on which a thin film transistor (hereinafter, referred to as a TFT) is formed, a second substrate on which color filters formed by R, G, and B colors are formed, a first substrate, and a second substrate. And a liquid crystal display panel including a liquid crystal layer interposed therebetween, and applying an electric voltage to the electrodes of the liquid crystal display panel to rearrange the liquid crystal molecules of the liquid crystal layer to adjust the amount of light transmitted to display an image.

However, in order to demand higher luminance than the liquid crystal display having the above-described configuration, a liquid crystal display using four colors (red (R), green (G), blue (B) and white (W)) driving has been proposed.

Such a liquid crystal display device having a four-color driving method has a high brightness, but has a disadvantage in that a process of patterning a white color filter is increased, resulting in a low productivity of a manufacturing process.

In addition, since a separate mask must be manufactured and used to pattern the white color filter, there is a problem that the price competitiveness of the product is lowered due to the cost increase.

Accordingly, a first object of the present invention for solving the above-described problems of the prior art is to provide a color filter substrate for a liquid crystal display device of four colors for improving optical properties and productivity.

It is a second object of the present invention to provide a method of manufacturing the color filter substrate.

A third object of the present invention is to provide a manufacturing method of an array substrate for liquid crystal display devices of four colors for improving optical properties and at the same time improving productivity.

Further, a fourth object of the present invention is to provide a liquid crystal display device for improving productivity and at the same time improving optical characteristics.

A color filter substrate for realizing the above-described first object of the present invention is a color filter substrate facing an array substrate with a liquid crystal layer interposed therebetween and including R, G, B and W color filters.

A substrate having black matrices defining red (R), green (G), blue (B), and white (W) display areas; R, G, and B color filters respectively provided in the R, G, and B display areas of the substrate; A first organic layer pattern provided in the W display area and having the same height as that of the R, G, and B color filters; It is provided on the black matrix, and includes a second organic film pattern for defining the thickness of the liquid crystal layer.

According to a method of manufacturing a color filter substrate for a liquid crystal display device for realizing a second object of the present invention, a black matrix for partitioning a red (R), green (G), blue (B) and white (W) display area is formed. Preparing a substrate; Forming R, G, and B color filters on the R, G, and B display areas, respectively; Forming an organic film having a uniform thickness on the resultant product; Patterning the organic layer to form a first organic layer pattern positioned in the W display area and a second organic layer pattern defining a thickness of a liquid crystal layer; And forming a common electrode layer existing only on the R, G, and B color filters and the first organic layer pattern.

A method of manufacturing an array substrate for a liquid crystal display device for realizing a third object of the present invention includes a thin film transistor on a substrate including red (R), green (G), blue (B), and white (W) display regions. Forming a; Forming R, G, and B color filters adjacent to the thin film transistors respectively present in the R, G, B, and W display areas of the substrate; Forming an organic film having a predetermined thickness on the resultant product; Patterning the organic layer to simultaneously form a first organic layer pattern in the W display area and transmitting white light and a second organic layer pattern covering the R, G, and B color filters, respectively; Patterning the result to form a contact hole exposing a portion of the thin film transistor; And forming a pixel electrode connected to the thin film transistor through the contact hole and on the first organic layer pattern and the second organic layer pattern.

A liquid crystal display device for realizing a fourth object of the present invention includes a substrate having a black matrix partitioning red (R), green (G), blue (B), and white (W) display regions, R, R, G and B color filters respectively provided in the G and B color filter areas, and a first organic layer pattern provided in the W color filter area and having the same height as the R, G and B color filter patterns, and the black matrix image. A color filter substrate including a second organic layer pattern provided on the second organic layer pattern to define a thickness of the cell gap, and a common electrode provided on the R, G, and B color filters and the first organic layer pattern; An array substrate on which the pixel electrode facing the common electrode is formed; It includes a liquid crystal layer interposed between the color filter substrate and the array substrate.

The color filter substrate, the array substrate, and the liquid crystal display device not only improve optical characteristics but also do not need to manufacture and pattern a mask to form a pattern for transmitting white light. Improve throughput and reduce costs.

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

1 is a perspective view schematically illustrating a pixel of a color filter substrate according to a first exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view of the color filter substrate corresponding to the pixel illustrated in FIG. .

As shown in FIG. 1, the color filter substrate of the present invention is a red (R) / green (G) / blue (B) / white (W) on a mosaic transparent glass substrate 100 arranged four pixels There is a cross-shaped black matrix 102 that divides the display area. In the display area of the glass substrate 100 partitioned by the black matrix 102, the red (R) / green (G) / blue (B) color filters 104, 106 and 108 and the light transmittance (W) have a rectangular shape. Each of the first organic film patterns 110a is present. The semiconductor device may further include a column spacer (not shown) and a common electrode (not shown), which are second organic film patterns.

In addition, as shown in FIG. 2, the color filter substrate 120 of the present invention includes a glass substrate 100, a black matrix 102, a red (R) / green (G) / blue (B) color filter 104, 106, and 108. A first organic layer pattern 110a of white (W), a column spacer 110b of a second organic layer pattern, and a common electrode 112a are included.

Here, the glass substrate (100) is a red (R) / green (G) / blue (B) color filter and a plurality of red (R) / green (G) / blue (B) to form a first organic film pattern / White (W) display area. The plurality of display areas are partitioned by the black matrix 102. The red (R) / green (G) / blue (B) color filters 104, 106, and 108 are formed of the color (R) / green (G) / blue (B) display regions, respectively. The first organic film pattern 110a is provided in the white (W) display area of the substrate and has the same thickness as the red (R) / green (G) / blue (B) color filters 104, 106, and 108.

The second organic layer pattern 110b is provided in the black matrix 105 and is a column spacer defining a thickness of the liquid crystal layer when the liquid crystal display panel is formed. The thickness of the column spacer is red (R) and green (G). The color filter of any one of the blue (B) color filters and the first organic layer pattern 110a overlap each other.

The common electrode 112a is a transparent electrode provided on the red (R) / green (G) / blue (B) color filters 104, 106, and 108 and the first organic layer pattern 110a. As it is stable, the processability of the electrode pattern is excellent.

3 is a schematic view illustrating a pixel of a color filter substrate according to a second exemplary embodiment of the present invention, and FIG. 4 is a cross-sectional view of the color filter substrate corresponding to the pixel illustrated in FIG.

As shown in FIG. 3, the color filter substrate 120 of the present invention has a red (R) / green (G) / blue (B) pattern on a transparent glass substrate 110 having four pixels arranged vertically. There is a stripe-shaped black matrix 102 that partitions the / W display area. In the display area of the glass substrate 100 partitioned by the black matrix 102, the red (R) / green (G) / blue (B) color filters 104, 106 and 108 and the light transmittance (W) have a rectangular shape. Each of the first organic film patterns 110a is present. Although not shown, a column spacer and a common electrode, which are second organic film patterns, are included.

As shown in FIG. 4, the color filter substrate 120 of the present invention includes a glass substrate 100, a black matrix 102, a red (R) / green (G) / blue (B) color filter (104, 106, 108) and a white ( The first organic film pattern 110a of W), the column spacer that is the second organic film pattern 110b, and the common electrode 112a are included. Since the color filter substrate has been described in detail in the first embodiment, the color filter substrate will be omitted in order to avoid duplication.

5A to 5E are cross-sectional views illustrating a method of manufacturing a color filter substrate according to a third exemplary embodiment of the present invention.

Referring to FIG. 5A, a black matrix 102 that is a light shielding film is formed on a surface of the transparent glass substrate 100. The black matrix 102 is formed of a metal or an organic insulator, and serves to partition the glass substrate into a red (R) / green (G) / blue (B) / white (W) display area.

Referring to FIG. 5B, except for the white (W) display area on the glass substrate 100, the red (R) / green (G) / blue (B) display area red (R) / green (G) / blue The color filters 104, 106 and 108 of (B) are formed, respectively.

In detail, First, a red (R) / green (G) / blue (B) color resin having a red color is applied to the entire surface of the substrate 100, and then selectively exposed, and a red (R) color filter 104 is applied to a desired area. ), The order of coloring Randomly It will be explained in the order of red (R), green (G), and blue (B)). Subsequently, a green color resin is coated on the entire surface of the substrate 100 on which the red color filter 104 is formed, and then selectively exposed to form a green color filter 106. Subsequently, a blue (B) color resin is coated on the entire surface of the substrate 100 on which the red (R) and green (G) color filters 108a and 108b are formed, and then selectively exposed to the blue color filter 108. To form.

Here, as a method of manufacturing the color filter, there are a method of manufacturing a dye type color filter and a method of manufacturing a pigment type color filter. The dye-type color filter may be produced by a dyeing method, a dye dispersion method, or the like. The pigment-type color filter may be prepared by a pigment dispersion method, a printing method, or an adhesion method.

In this case, the dyeing method, the dye dispersion method and the pigment dispersion method can be applied to all of the stripe, mosaic and triangle array method, the printing method and the adhesion method is not suitable for the mosaic and triangle array method.

Referring to FIG. 5C, the organic layer 110 is formed on the glass substrate 100 on which the black matrix 102 and the red (R) / green (G) / blue (B) color filters 104, 106, and 108 are formed. Here, the organic film is a light-transmissive resin, a material that is cured when irradiated with light, and the thickness of the organic film is formed in consideration of the thickness of the liquid crystal layer of the liquid crystal display device.

Then, an exposure mask 125 for forming the first organic film pattern and the second organic film pattern on the organic film 110 is interposed. Here, the exposure mask 125 includes an opening having the same diameter as the column spacer to be formed and a plurality of slit openings for half-exposure the organic film existing in the white display area.

Referring to FIG. 5D, the organic layer 110 is patterned to simultaneously form the first organic layer pattern 110a and the second organic layer pattern 110b.

In detail, first, the organic mask 110 is irradiated with UV light to selectively expose the organic layer by applying the exposure mask. At this time, since the black organic film 110 according to the present invention is negative, the light irradiated portion remains after development.                     

Subsequently, a predetermined cleaning process is performed on the resultant product to simultaneously form the first organic film pattern 110a having the first thickness and the second organic film pattern 110b having the second thickness. The first organic layer pattern has the same thickness as that of the color filter, and the second organic layer pattern has the same thickness as the column spacer to be formed.

Referring to FIG. 5E, a common electrode 112a existing only on the red (R) / green (G) / blue (B) color filters 104, 106, and 108 and the first organic layer pattern 110a is formed. In detail, first, a common electrode film having a predetermined thickness is continuously formed on the resultant. The common electrode layer may be formed by depositing one selected from a group of transparent conductive materials including indium tin oxide (ITO) and indium zinc oxide (IZO).

Subsequently, the common electrode layer on the second organic layer pattern is etched by applying an etching mask that exposes the second organic layer pattern, thereby red (R) / green (G) / blue (B) color filters 104, 106, and 108. ) And the common electrode 120 existing only on the first organic layer pattern.

The color filter substrate of the present invention formed through the above-described process can simultaneously form the column spacer and the organic film pattern present in the white display area, thereby simplifying the process and reducing the mask manufacturing cost. It has advantages

6A to 6G are cross-sectional views illustrating a method of manufacturing an array substrate according to a fourth exemplary embodiment of the present invention.

Referring to FIG. 6A, a gate electrode 221 and an active pattern 225 may be formed on a glass substrate 210 including an arbitrary red (R) / green (G) / blue (B) / white (W) display area. ), A thin film transistor (hereinafter referred to as TFT) including an ohmic contact layer pattern 224, a source electrode 222, and a drain electrode 223 is formed.

 In detail, first, a first metal film (not shown) made of glass substrate 210 aluminum (Al), chromium (Cr), or molybdenum tungsten (MoW) is deposited by a sputtering method, and then the first metal is deposited. The film is patterned to form the gate electrode 221.

Subsequently, silicon nitride is deposited on the entire surface of the glass substrate 210 on which the gate electrode 221 is formed by a plasma-enhanced chemical vapor deposition (PECVD) method to form a gate insulating film.

Subsequently, as an active layer (not shown), for example, an amorphous silicon film is deposited on the gate insulating film by a PECVD method, and as an ohmic contact layer (not shown), for example, n ⁺ doped amorphous A silicon film is deposited by the PECVD method. Subsequently, the ohmic contact layer and the active layer are sequentially patterned to form an active pattern 225 consisting of an amorphous silicon film on the gate insulating layer on the gate electrode 221 and an ohmic contact layer pattern 224 consisting of an n ⁺ doped amorphous silicon film. To form.

After depositing a second metal film (not shown) such as chromium (Cr) on the entire surface of the resultant by a sputtering method, the second metal film is patterned to form a source electrode 222 and a drain electrode 223. Subsequently, the exposed ohmic contact layer pattern between the source electrode 222 and the drain electrode 223 is removed by a reactive ion etching (RIE) method.

As a result, the TFT 220 including the gate electrode 221, the active pattern 225, the ohmic contact layer pattern 224, the source electrode 222, and the drain electrode 223 is formed on the glass substrate 210.

6B and 6C, a silicon nitride is chemically vapor deposited on the entire surface of the glass substrate 210 on which the TFT 220 is formed to form a passivation film 235 having a uniform thickness. Here, the passivation film 235 is made of an inorganic insulator, such as silicon oxide (SiO ₂ ) or silicon nitride (SiN _X ), which has good adhesion with a metal material and suppresses formation of an air layer at an interface, and is preferably formed to a thickness of about 2000 μs. Do.

Subsequently, red (R) / green (on the passivation film) is adjacent to each of the TFTs 220 present in an arbitrarily defined red (R) / green (G) / blue (B) display area of the glass substrate. G) / blue (B) color filters 240,242,244 are formed, respectively. The color filter is formed by applying a pigment spraying method or a printing method.

In this case, the passivation layer 235 positioned in the white (W) display area may be left as an empty space 245 in which no color filter exists.

6D and 6E, an organic layer 250 covering the red (R) / green (G) / blue (B) color filters 240, 242, and 244 is coated while the empty space is buried. The organic layer 250 is a light-transmissive material capable of a photo pattern, and is applied to improve and improve the aperture ratio and luminance of the liquid crystal display.                     

Subsequently, the first organic film pattern 250a and the second organic film pattern 250b are simultaneously formed by performing the exposure process and the development process on the organic film 250 through the exposure mask 290.

In detail, first, the organic mask 250 is irradiated with UV light to selectively expose the organic layer by applying the exposure mask. At this time, since the organic film 250 according to the present invention is negative, the light irradiated portion remains after development.

Subsequently, a cleaning (development) process is performed on the resultant product, which is present in the white (W) display area and has a first thickness. The first organic layer pattern 250a and red (R) / green (G) / blue (B) The second organic layer pattern 250b which is present on the color filter and has a second thickness is simultaneously formed. The first organic layer pattern 250a has a thickness in which the color filter and the second organic layer pattern 250b overlap each other.

Here, the exposure mask half-opens the organic layer existing on the red (R) / green (G) / blue (B) color filter and the opening for exposing the entire surface of the organic layer existing in the white (W) display area. And a plurality of slit openings for exposing.

6F and 6G, the drain electrode 223 of the TFT 220 under the first organic layer pattern 250a and the color filters 240, 242, and 244 and the second organic layer pattern 250b. To form a contact hole for exposing a portion.

Subsequently, the pixel electrode 260 is electrically connected to the drain electrode 224 through the contact hole. The pixel electrode may be applied not only to the transparent electrode but also to both the transparent electrode and the reflective electrode.

7 is a schematic cross-sectional view of a liquid crystal display according to a fifth exemplary embodiment of the present invention.

Referring to FIG. 7, the liquid crystal display 400 of the present invention includes a color filter substrate 120, an array substrate 200, and a liquid crystal layer 300 interposed between the color filter substrate and the array device.

The color filter substrate 120 may include a glass substrate 100, a black matrix 102, a red (R) / green (G) / blue (B) color filter 104, 106, 108, and a white (W) first organic layer pattern 110a. ), A column spacer 110b which is a second organic layer pattern, and a common electrode 112a.

Here, the glass substrate (100) is a red (R) / green (G) / blue (B) color filter and a plurality of red (R) / green (G) / blue (B) to form a first organic film pattern / White (W) display area. The plurality of display areas are partitioned by the black matrix 102.

The first organic film pattern 110a is provided in the white (W) display area of the substrate and has the same thickness as the red (R) / green (G) / blue (B) color filters 104, 106, and 108. The second organic layer pattern 110b is provided in the black matrix 105 and is a column spacer defining a thickness of the liquid crystal layer when the liquid crystal display panel is formed. The thickness of the column spacer is red (R) and green (G). ) The thickness of one of the color filters of the blue (B) color filter and the first organic layer pattern is the same. The common electrode 112a is a transparent electrode provided on the red (R) / green (G) / blue (B) color filters 104, 106, and 108 and the first organic layer pattern 110a.

The array substrate 200 includes a transparent substrate 210 disposed to face the color filter substrate 120, a thin film transistor 220 acting as a switching element, an insulating film 250, and a pixel electrode 260 electrically connected to the thin film transistor. ) Is included.

Here, the pixel electrode 260 may be applied not only to the transparent electrode but also to both the transparent electrode and the reflective electrode. In addition, the column spacer of the array substrate 200 and the color filter substrate 120 are attached by a coupling member, and the gap between the liquid crystal layer 300 is maintained by the column spacer.

As described above, the liquid crystal display according to the present invention can simultaneously form the first organic film pattern existing in the white display area and the second organic film pattern for the column spacer to separately pattern the white color filter. It has the advantage of shortening the process can improve the productivity of the manufacturing process.

In addition, since it is not necessary to manufacture a separate mask to pattern the white color filter, it is possible to increase the price competitiveness of the product due to the reduction in production cost.

Claims (16)

A substrate having R, G, B, and W display areas; R, G, and B color filters respectively provided in the R, G, and B display areas; A first organic layer pattern in the W display area; And A second organic film formed between R, G, and B color filters adjacent to each other, defining a thickness of the liquid crystal layer, and formed by the same patterning process as the first organic film, and made of the same material as the first organic film A color filter substrate comprising a pattern. The color filter substrate of claim 1, further comprising a common electrode layer provided on the R, G, and B color filters and the first organic layer pattern. The color filter substrate of claim 1, wherein the first organic layer pattern is a W color filter having the same height as the R, G, and B color filters. The color filter substrate of claim 1, wherein the second organic layer pattern is a column spacer. (a) providing a substrate on which black matrices defining R, G, B, and W display regions are formed; (b) forming R, G, and B color filters on the R, G, and B display areas, respectively; (c) forming an organic film having a uniform thickness on the resultant of step (b); (e) patterning the organic layer to form a first organic layer pattern positioned in the W display area and a second organic layer pattern defining a thickness of a liquid crystal layer; And (f) forming a common electrode layer existing only on the R, G, and B color filters and the first organic layer pattern. The method of claim 5, wherein the first organic layer pattern is formed by half-exposing the organic layer. The method of claim 5, wherein the second organic layer pattern is a column spacer. The method of claim 7, wherein the step (f), (f-1) forming a conductive layer having a uniform thickness on the substrate on which the R, G, and B color filters, the first organic film pattern, and the second organic film pattern are formed; And (f-2) removing the conductive layer existing on the column spacer. (a) forming a thin film transistor on a substrate including R, G, B, and W display regions; (b) forming R, G, and B color filters adjacent to the thin film transistors respectively present in the R, G, B, and W display areas of the substrate; (c) forming an organic film having a predetermined thickness on the resultant of step (b); (d) patterning the organic layer to simultaneously form a first organic layer pattern present in the W display area and transmitting white light and a second organic layer pattern respectively covering the R, G, and B color filters; (e) patterning the resultant of step (d) to form a contact hole exposing a portion of the thin film transistor; And (f) forming a pixel electrode connected to the thin film transistor through the contact hole and on the first organic layer pattern and the second organic layer pattern. The method of claim 9, wherein the thickness of the first organic layer pattern is equal to a thickness of the R, G, or B color filter and the second organic layer pattern. The method of claim 9, wherein the second organic layer pattern is formed by half-exposing the organic layer. 10. The method of claim 9, wherein the pixel electrode comprises a transparent electrode and a reflective electrode. A transparent substrate having a black matrix partitioning the R, G, B, and W display regions, R, G, B color filters provided in the R, G, and B display regions of the transparent substrate, and the W display region; A first organic layer pattern, a second organic layer pattern formed on the black matrix to define a thickness of a cell gap, and formed by the same patterning process as the first organic layer, and formed of the same material as the first organic layer; A color filter substrate including a common electrode provided on the R, G, and B color filters and the first organic layer pattern; An array substrate facing the color filter substrate and including a thin film transistor arranged in a matrix and a pixel electrode electrically connected to the thin film transistor; And And a liquid crystal layer interposed between the color filter substrate and the array substrate, the liquid crystal layer changing transmittance by a voltage difference between the common electrode and the pixel electrode. delete The liquid crystal display of claim 13, wherein the first organic layer pattern is a W color filter having the same height as the R, G, and B color filter patterns. The liquid crystal display of claim 13, wherein the second organic layer pattern is a column spacer.

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