KR20100018001A - Apparatus method of fabricating liquid crystal display panel and apparatus of fabricating black matrix - Google Patents

Abstract

PURPOSE: An LCD panel, a manufacturing method thereof and a black matrix manufacturing device are provided to form a black matrix by partial combustion of a color filter, thereby replacing chrome and organic material. CONSTITUTION: A black matrix(222) and a color filter(226) are formed on an upper substrate(221). A common electrode(224) and an upper orientation film(228) are formed on the black matrix and the color filter. A TFT(Thin Film Transistor), a pixel electrode(229) and a lower orientated film(230) are formed on an lower substrate(225). A liquid crystal is inserted to the internal space between the upper substrate and the lower substrate. The black matrix performs light leakage prevention and external light absorption. The black matrix is formed by partial combustion of the color filter.

Description

Liquid crystal display panel and its manufacturing method and black matrix manufacturing apparatus applied thereto {Apparatus Method of Fabricating Liquid Crystal Display Panel and Apparatus of Fabricating Black Matrix}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel, and more particularly, to a liquid crystal display panel, a method for manufacturing the same, and a black matrix manufacturing apparatus applied thereto.

In general, a liquid crystal display (LCD) displays an image corresponding to a video signal on a liquid crystal display panel in which liquid crystal cells are arranged in a matrix form by adjusting light transmittance of liquid crystal cells according to a video signal. To this end, the liquid crystal display device includes a liquid crystal display panel in which liquid crystal cells are arranged in an active matrix form, and driving circuits for driving the liquid crystal display panel.

1 is a cross-sectional view showing a conventional liquid crystal display panel.

The liquid crystal display panel illustrated in FIG. 1 includes a black matrix 22, a color filter 26, a planarization layer 27, a common electrode 24, and an upper alignment layer 28 that are sequentially formed on the upper substrate 21. An upper plate, a TFT formed on the lower substrate 25, a lower plate composed of the pixel electrode 29 and the lower alignment layer 30, and a liquid crystal (not shown) injected into an inner space between the upper plate and the lower plate. do.

In the upper plate, the black matrix 22 is formed on the upper substrate 21 corresponding to the TFT region of the lower plate and the gate line and data line regions (not shown), and defines a cell region in which the color filter 26 is to be formed. Prepare. The black matrix 22 prevents light leakage and absorbs external light to increase contrast. The color filter 26 is formed over the cell region separated by the black matrix 22 and the black matrix 22. The color filter 26 is formed for each of R, G, and B to implement R, G, and B colors. The planarization layer 27 is formed to cover the color filter to planarize the upper substrate. The common electrode 24 is supplied with a common voltage to be a reference when driving a liquid crystal. The spacer (not shown) serves to maintain a cell gap between the upper and lower plates.

 In the lower plate, the TFT includes a gate electrode 16 formed on the lower substrate 25 together with a gate line (not shown), and a semiconductor layer overlapping the gate electrode 16 with the gate insulating film 139 therebetween. 136 and source / drain electrodes 138 and 140 formed with a data line (not shown) with the semiconductor layer 136 interposed therebetween. This TFT supplies the pixel signal from the data line to the pixel electrode 29 in response to the scan signal from the gate line.

The pixel electrode 29 is a transparent conductive material having a high light transmittance and is in contact with the drain electrode 140 of the TFT with the protective film 208 therebetween. The upper and lower alignment layers 28 and 30 for liquid crystal alignment are formed by applying an alignment material such as polyimide and then performing a rubbing process.

2A to 2F are cross-sectional views illustrating a method of manufacturing a top plate of a conventional liquid crystal display panel in stages.

First, an opaque material such as an opaque metal or an opaque resin is deposited on the upper substrate 21, and then an organic material is patterned by a photolithography process and an etching process to form a black matrix 22 as illustrated in FIG. 2A. . As the opaque metal, chromium (Cr) is generally used, and an organic material is used as the opaque resin.

After the red resin R is deposited on the upper substrate 21 on which the black matrix 22 is formed, the red resin R is patterned by a photolithography process and an etching process, thereby showing a red color filter as shown in FIG. 2B. (3R) is formed.

After the green resin G is deposited on the upper substrate 21 on which the red color filter 3R is formed, the green resin G is patterned by a photolithography process and an etching process, thereby displaying green color as shown in FIG. 2C. A filter 3G is formed. After the blue resin B is deposited on the upper substrate 21 on which the green color filter 3G is formed, the blue resin B is patterned by a photolithography process and an etching process. The filter 3B is formed.

As the organic material is entirely deposited on the upper substrate 21 on which the red, green, and blue color filters 26 are formed, the planarization layer 27 is formed as shown in FIG. 2E.

A transparent conductive material is deposited on the upper substrate 21 on which the planarization layer 27 is formed and then patterned to form a common electrode 24 as shown in FIG. 2F.

As described above, in the conventional liquid crystal display panel, chromium (Cr) is used as a black matrix material, but chromium (Cr) is gradually regulated as an environmental harmful substance. For this reason, although the black matrix is formed using the opaque resin, the opaque resin has a disadvantage that the manufacturing cost is high and the yield is poor as the organic film.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display panel having a black matrix which can be environmentally friendly and can reduce manufacturing costs, and a method of manufacturing the same.

In order to achieve the above object, a liquid crystal display panel having a black matrix for preventing light leakage and absorbing external light, comprising: a color filter formed on a substrate; And a black matrix formed by burning a part of the color filter.

The color filter may include red, green, and blue color filters.

The black matrix is characterized in that the boundary of the red, green and blue color filter is formed by burning by the laser beam.

The black matrix is characterized by having a line width of about 18 ~ 22㎛.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display panel, comprising: forming a color filter on a substrate; And burning a portion of the color filter with a laser beam to form a black matrix.

The forming of the color filter may include forming red, green, and blue color filters.

The forming of the black matrix may include irradiating and burning a laser beam at a boundary of the red, green, and blue color filters.

The forming of the black matrix may include irradiating boundary portions of the red, green, and blue color filters while moving the laser beam.

An apparatus for manufacturing a black matrix of a liquid crystal display panel according to the present invention includes a mask arranged to expose a region where a black matrix is to be formed on a substrate on which a color filter is formed; A laser beam generator for generating a laser beam; And a laser beam path adjusting unit for adjusting a path of the laser beam so as to sequentially irradiate a portion of the color filter exposed through the mask.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

The liquid crystal display panel and its manufacturing method according to an embodiment of the present invention are formed by burning the boundary between the color filters. Accordingly, by being able to replace the chromium and organic materials it is possible to reduce the manufacturing cost and environmentally friendly.

1 is a cross-sectional view showing a conventional liquid crystal display panel.
2A to 2F are cross-sectional views illustrating a method of manufacturing a top plate of a conventional liquid crystal display panel in stages.
3 is a cross-sectional view illustrating a liquid crystal display panel according to a first embodiment of the present invention.
4A through 4F are cross-sectional views illustrating a method of manufacturing a top plate of the liquid crystal display panel illustrated in FIG. 3.
5 is a cross-sectional view illustrating a liquid crystal display panel according to a second exemplary embodiment of the present invention.
6A through 6F are cross-sectional views illustrating a method of manufacturing a top plate of the liquid crystal display panel illustrated in FIG.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 6.

3 is a cross-sectional view illustrating a liquid crystal display panel according to a first embodiment of the present invention.

3 illustrates a top panel including a black matrix 122, a color filter 126, a common electrode 124, and an upper alignment layer 128 that are sequentially formed on the upper substrate 121, and a lower substrate. A TFT formed on the 125, a lower plate composed of the pixel electrode 129 and the lower alignment layer 130, and a liquid crystal (not shown) injected into an inner space between the upper plate and the lower plate.

In the upper plate, the black matrix 122 is formed on the upper substrate 121 to correspond to the TFT region of the lower plate and the gate line and data line regions (not shown), and defines a cell region in which the color filter 126 is to be formed. Prepare. The black matrix 122 is composed of a double layer of the insulating layer 120 and the metal layer 121 to prevent light leakage and to absorb external light to enhance contrast. That is, the light emitted from the backlight (not shown) passes through the lower plate to partially reflect and partially transmit the light from the insulating layer 120 of the black matrix 122. The light partially transmitted through the insulating layer 120 is partially reflected by the metal layer 121 and partially absorbed. In this case, the insulating layer 120 is formed to have a thickness that may cause a destructive interference, for example, about 400 to 600 Å so that the light reflected by the insulating layer 120 and the partial light reflected by the metal layer 121 cancel each other.

The color filter 126 is formed in the cell region and the black matrix 122 separated by the black matrix 122. The color filter 126 is formed for each of R, G, and B to implement R, G, and B colors. The planarization layer 127 is formed to cover the color filter 126 to planarize the upper substrate 121. The common electrode 24 is supplied with a common voltage which is a reference when driving the liquid crystal. The spacer (not shown) serves to maintain a cell gap between the upper substrate 121 and the lower substrate 125.

 In the lower panel, the TFT includes a gate electrode 116 formed on the lower substrate 125 together with a gate line (not shown), and a semiconductor layer overlapping the gate electrode 116 with the gate insulating film 239 interposed therebetween. 236 and source / drain electrodes 238 and 240 formed with a data line (not shown) with a semiconductor layer 236 interposed therebetween. The TFT supplies a pixel signal from the data line to the pixel electrode 129 in response to a scan signal from the gate line.

The pixel electrode 129 is a transparent conductive material having a high light transmittance and contacts the drain electrode 240 of the TFT with the passivation layer 208 therebetween. The upper and lower alignment layers 128 and 130 for liquid crystal alignment are formed by applying an alignment material such as polyimide and then performing a rubbing process.

4A through 4F are cross-sectional views illustrating a method of manufacturing a top plate of the liquid crystal display panel illustrated in FIG. 3.

First, an opaque metal material and an inorganic insulating material are sequentially deposited on the upper substrate 121, and then the inorganic insulating material and the opaque metal material are patterned by a photolithography process and an etching process, so that the insulating layer ( The black matrix 122 composed of the double layer 120 and the metal layer 121 is formed. Here, the thickness of the insulating layer 120 is about 400-600 kPa, and the thickness of the metal layer 121 is about 1000-3000 kPa. Silicon nitride (SiNx) is used as the inorganic insulating material, and molybdenum (Mo) is used as the opaque metal.

After the red resin R is deposited on the upper substrate 121 on which the black matrix 122 is formed, the red resin R is patterned by a photolithography process and an etching process, thereby showing a red color filter as shown in FIG. 4B. 103R is formed.

After the green resin G is deposited on the upper substrate 121 on which the red color filter 103R is formed, the green resin G is patterned by a photolithography process and an etching process, thereby displaying a green color as shown in FIG. 4C. Filter 103G is formed. After the blue resin B is deposited on the upper substrate 121 on which the green color filter 103G is formed, the blue resin B is patterned by a photolithography process and an etching process. Filter 103B is formed.

As the organic material is entirely deposited on the upper substrate 121 on which the red, green, and blue color filters 126 are formed, the planarization layer 127 is formed as shown in FIG. 4E.

A transparent conductive material is deposited on the upper substrate 121 on which the planarization layer 127 is formed, and then patterned to form a common electrode 124 as shown in FIG. 4F.

As described above, in the liquid crystal display panel according to the first embodiment of the present invention, the black matrix 122 is formed as a double layer of the insulating layer 120 and the metal layer 121, thereby replacing chromium and organic materials. As a result, it is possible to reduce the manufacturing cost while being environmentally friendly.

5 is a cross-sectional view illustrating a liquid crystal display panel according to a second exemplary embodiment of the present invention.

The liquid crystal display panel illustrated in FIG. 5 includes a black matrix 222 and a color filter 226 formed on the upper substrate 221, a common electrode 224 formed on the black matrix 222 and the color filter 226. Liquid crystal injected into the inner space between the upper plate composed of the upper alignment layer 228, the TFT formed on the lower substrate 225, the lower plate composed of the pixel electrode 229 and the lower alignment layer 230, and the upper plate and the lower plate. (Not shown).

In the upper plate, the black matrix 222 is formed on the upper substrate 221 corresponding to the TFT region of the lower plate and the gate line and data line regions (not shown), and defines a cell region in which the color filter 226 is to be formed. Prepare. The black matrix 222 is formed by causing the boundary of the color filter 226 to be burned by the laser beam 55 to make it black. Here, the black matrix 222 is formed at the same height as the color filter 226. The black matrix 222 prevents light leakage and absorbs external light to increase contrast.

The color filter 226 is formed in the cell region separated by the black matrix 222. The color filter 226 is formed for each of R, G, and B to implement R, G, and B colors. The common electrode 224 is supplied with a common voltage for controlling the movement of the liquid crystal. The spacer (not shown) serves to maintain a cell gap between the upper and lower plates.

 In the lower plate, the TFT includes a gate electrode 216 formed on the lower substrate 225 together with a gate line (not shown), and a semiconductor layer overlapping the gate electrode 216 with the gate insulating film 339 therebetween. 336 and source / drain electrodes 338 and 340 formed with a data line (not shown) with the semiconductor layer 336 therebetween. The TFT supplies a pixel signal from the data line to the pixel electrode 229 in response to a scan signal from the gate line.

The pixel electrode 229 is a transparent conductive material having a high light transmittance and contacts the drain electrode 340 of the TFT with the passivation layer 308 therebetween. The upper and lower alignment layers 228 and 230 for liquid crystal alignment are formed by applying an alignment material such as polyimide and then performing a rubbing process.

6A through 6E are cross-sectional views illustrating a method of manufacturing a top plate of the liquid crystal display panel illustrated in FIG. 5.

First, the red resin R is deposited on the upper substrate 221, and then the red resin R is patterned by a photolithography process and an etching process to form a red color filter 203R as illustrated in FIG. 6A. do.

After the green resin G is deposited on the upper substrate 221 on which the red color filter 203R is formed, the green resin G is patterned by a photolithography process and an etching process, thereby displaying green color as shown in FIG. 6B. A filter 203G is formed. After the blue resin B is deposited on the upper substrate 221 on which the green color filter 203G is formed, the blue resin B is patterned by a photolithography process and an etching process. Filter 203B is formed.

The black matrix 222 is formed using a laser generator and a mask 72 in a region where the black matrix 222 is to be formed on the upper substrate 221 on which the red, green, and blue color filters 226 are formed. Here, the mirror 57 and the focus lens 59 determine the laser beam path.

The laser generator includes a laser generator 31 for generating a laser beam 55, a mirror 57 for adjusting a path of the laser beam 55 generated by the laser generator 31, and an incident laser beam ( And a focus lens 59 for focusing 55 and irradiating the focused laser beam 55 onto the substrate.

Specifically, the laser beam 55 through the mask 72 having the transmission portion P1 and the blocking portion P2 on the upper substrate 221 on which the color filter 226 is formed, and the transmission portion P1 of the mask 72. Are arranged so that the laser generating apparatus is irradiated. Thereafter, as shown in FIG. 6D, the laser beam 55 generated from the laser generating unit 31 is reflected by the mirror 31 and focused by the focus lens 59 to transmit the transparent portion P1 of the mask 72. It is irradiated sequentially while moving to the boundary of red, green and blue color filter via). As a result, the predetermined region including the boundary portions of the red, green, and blue color filters is burned by the laser beam 55, thereby becoming black. By repeatedly irradiating the laser beam 55 many times, a black matrix 222 having a predetermined width is formed as shown in FIG. 6E. The line width of a black matrix is about 18-22 micrometers, for example.

A transparent conductive material is deposited on the upper substrate 221 on which the black matrix 222 and the color filter 226 are formed, and then patterned, thereby forming a common electrode 224 as shown in FIG. 6F.

As such, the black matrix 222 is formed by irradiating the boundary portions of the red, green, and blue color filters of the liquid crystal display panel according to the second embodiment of the present invention with the laser beam 55. This eliminates the need for a separate black matrix 222 material and eliminates the need for a planarization layer. As a result, the manufacturing cost of the liquid crystal display panel can be reduced.

The black matrix forming method described in the first and second embodiments is not only a liquid crystal display panel in twisted nematic (TN) mode but also an liquid crystal display panel in IPS (in plan switch) mode, and furthermore, ECB (Electric Controlled Birefringence) and VA (Vertical). It can also be easily applied to the liquid crystal display panel of the alignment mode.

21,121,221: Upper substrate 22,122,222: Black matrix
24,124,224 Common electrode 25,125,225 Lower substrate
26,126,226: color filter 28,30,128,130: alignment film

Claims (9)

A liquid crystal display panel having a black matrix for preventing light leakage and absorbing external light,
A color filter formed on the substrate;
And a black matrix formed by burning a part of the color filter. The method of claim 1,
The color filter includes a red, green and blue color filter. The method of claim 2,
And wherein the black matrix is formed by burning a boundary between the red, green, and blue color filters by a laser beam. The method of claim 1,
The black matrix has a line width of about 18 ~ 22㎛. In the manufacturing method of the liquid crystal display panel containing a black matrix,
Forming a color filter on the substrate;
And composing a portion of the color filter with a laser beam to form a black matrix. The method of claim 5, wherein
Forming the color filter
Forming a red, green and blue color filter comprising the steps of manufacturing a liquid crystal display panel. The method of claim 6,
Forming the black matrix
And irradiating and burning a laser beam on a boundary of the red, green, and blue color filters. The method of claim 7, wherein
Forming the black matrix
And irradiating the boundary portions of the red, green, and blue color filters while the laser beam is moving. A mask arranged to expose a region where a black matrix is to be formed on a substrate on which a color filter is formed;
A laser beam generator for generating a laser beam;
And a laser beam path adjusting unit for adjusting a path of the laser beam so as to sequentially irradiate a portion of the color filter exposed through the mask.

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