KR20040034899A - Liquid crystal display device using of column spacer and the fabrication method - Google Patents

Abstract

PURPOSE: An LCD device using column spacers is provided to use column spacers, and to improve an adhesive force of the column spacers formed on pixel electrodes, thereby preventing a possibility of loss and improving a yield. CONSTITUTION: A black matrix(402) is formed on a transparent insulating substrate(401). An R/G/B color filter layer(403) is deposited to express colors on a space of the black matrix(402). A common electrode(404) defines a transparent conductive film made of an ITO(Indium Tin Oxide) material in predetermined patterns on the R/G/B color filter layer(403). Column spacers(405) are disposed on the common electrode(404) in predetermined patterns. Holes of the common electrode(404), where the column spacers(405) are disposed, are made in smaller patterns than the column spacers(405).

Description

Liquid crystal display using column spacer and manufacturing method therefor {LIQUID CRYSTAL DISPLAY DEVICE USING OF COLUMN SPACER AND THE FABRICATION METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device using a column spacer and a method of manufacturing the same. In particular, the liquid crystal display device using the column spacer capable of improving the adhesion of the column spacer formed on the pixel electrode to prevent the risk of loss and improving the yield. And to a method for producing the same.

In the 21st century's highly information society, as the consumption pattern is diversified, low power consumption, light weight, and high quality can be realized, thereby maximizing space utilization and requiring a portable display.

TFT-LCD is a display that can satisfy most of these conditions, and is expected to be a key device to replace the existing cathode ray tube (CRT) as a leader in flat panel displays including plasma display panels (PDPs) in large fields.

TFT-LCD is a 21st century type high-tech display that can be used for 24 hours without generating harmful electromagnetic waves to the human body because it is easy to carry, such as light weight, low power consumption and high-resolution sphere, compared to CRT, but high manufacturing cost, narrow viewing angle, low luminance Although there are still technical fields to be supplemented, such as disadvantages relative to the enlargement, the technology development is progressing to a considerable level.

In general, a liquid crystal display device is provided with a first substrate (thin film transistor substrate) and a second substrate (color filter substrate) facing each other at a predetermined interval. The liquid crystal display device will be described in more detail. In the first substrate (thin film transistor substrate), gate bus lines and data bus lines are formed on an inner surface of one transparent substrate in a matrix.

Thin film transistors (TFTs), which function as switching elements, are formed at intersections of the gate bus lines and the data bus lines, and square pixel electrodes contacting the drain electrodes of the TFTs are surrounded by the gate bus lines and the data bus lines. It is formed in the form of each.

The other second substrate (color filter substrate) facing the transparent substrate on which the plurality of pixel electrodes is formed has a BM (Black Matrix: BM), a color filter layer, and a common electrode formed on an inner surface of the transparent substrate.

When one gate bus line and one data bus line of the liquid crystal display device configured as described above are selected and a voltage is applied, only a thin film transistor (TFT) to which the voltage is applied is turned on, and the on Charges are accumulated in the pixel electrode connected to the drain electrode of the TFT to change the angle of the liquid crystal molecules between the common electrode and the common electrode.

1 is a diagram showing the structure of a general first substrate (thin film transistor substrate). As shown in the drawing, first, a gate electrode 102 is formed on the transparent substrate 101, and the gate insulating layer 103 is grown on the gate electrode 102 by plasma enhanced chemical vapor deposition (PECVD).

Next, an amorphous silicon layer doped with amorphous silicon and phosphorus is patterned by a photolithography process after deposition to form an active layer 104a and an ohmic contact layer 104b. The source / drain electrodes 105 are formed by etching the photoresist on the active layer 104a and the ohmic contact layer 104b.

Thereafter, the passivation layer 106 is formed by using an inorganic layer, and a pixel electrode 107 is formed on the passivation layer 106 by indium tin oxide (ITO).

2 is a diagram illustrating a structure of a second substrate (color filter substrate) using a column spacer according to the related art. As shown in FIG. 2, first, a black matrix (BM) 202 is formed on the transparent substrate 201.

Subsequently, R, G, and B color filter layers 203 and a common electrode 204 of an indium tin oxide (ITO) film, which is a transparent conductive film, are sequentially formed on the transparent substrate 201 on which the black matrix (BM) 202 is formed. .

A black resin column spacer 205 is patterned on the entire substrate including the common electrode at predetermined intervals. Here, the column spacer 205 serves as an existing spacer for maintaining a liquid crystal cell gap between the first substrate and the second substrate.

FIG. 3 is a view illustrating the loss of column spacers in a liquid crystal display according to the related art. As shown in the drawing, the column spacer formed on the common electrode has a weak adhesive force when a strip (alkaline solution), ultrasonic wave, DI water jet spray, brush, or the like is cleaned to remove foreign substances from the color filter substrate.

In addition, the common electrode may be formed of an inorganic layer, and the column spacer may be formed of an organic layer, and thus may have a weak adhesive force. Thus, the column spacer may be lost from the common electrode.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display using a column spacer and a method of manufacturing the same, which can improve the adhesion of the column spacer formed on the pixel electrode to prevent the risk of loss and improve the yield.

1 is a view showing the structure of a general first substrate (thin film transistor substrate)

2 is a view showing the structure of a second substrate (color filter substrate) using a column spacer according to the prior art.

FIG. 3 is a view illustrating a column spacer lost in a liquid crystal display according to the related art. FIG.

4 is a schematic view of a liquid crystal display using a column spacer according to the present invention.

5A to 5D illustrate a first embodiment of a method of manufacturing a liquid crystal display device using the column spacer according to the present invention.

FIG. 6 illustrates a second embodiment of a structure of a liquid crystal display using a column spacer according to the present invention. FIG.

FIG. 7 illustrates a third embodiment of a structure of a liquid crystal display using a column spacer according to the present invention. FIG.

8 is a view showing a fourth embodiment of the structure of a liquid crystal display device using the column spacer according to the present invention;

9 is a view showing a fifth embodiment of the structure of a liquid crystal display device using the column spacer according to the present invention.

FIG. 10 illustrates a sixth embodiment of a structure of a liquid crystal display device using a column spacer according to the present invention; FIG.

<Description of the symbols for the main parts of the drawings>

401,601,701,801 --- Substrate 402,602,702,802 --- Black Matrix

403,603,703,803 --- Color filter layer 404,604,704,804 --- Common electrode

405,601,701,801 --- Column spacer 806 --- Flattening film

In order to achieve the above object, a liquid crystal display using the column spacer according to the present invention,

A black matrix formed on the transparent insulating substrate at predetermined intervals;

Color filter layers of R, G, and B formed for color expression in the space between the black matrices;

A common electrode provided on the color filter layer and having a plurality of holes formed in a predetermined pattern;

It is characterized in that it comprises a column spacer formed corresponding to a plurality of hole positions provided in a predetermined pattern on the common electrode.

Here, the hole in which the column spacer provided on the common electrode is to be formed is characterized in that it is formed in a pattern smaller than the area in which the column spacer is to be formed.

Here, the hole in which the column spacer provided on the common electrode is formed is characterized in that it is formed in a pattern of concave-convex structure.

In addition, in order to achieve the above object, a method of manufacturing a liquid crystal display device using the column spacer according to the present invention,

Forming a black matrix on the transparent insulating substrate;

Sequentially forming a color filter layer of red color, green color, and blue color on the formed black matrix;

Depositing a transparent conductive film on the formed color filter layer to form a common electrode;

Forming a hole in which a column spacer is to be formed on the formed common electrode in a predetermined pattern;

It is characterized in that it comprises the step of forming a column spacer in the formed hole.

In addition, in order to achieve the above object, a liquid crystal display using the column spacer according to the present invention,

A black matrix formed on the transparent insulating substrate at predetermined intervals;

Color filter layers of R, G, and B formed for color expression in the space between the black matrices;

A planarization film formed on the color filter layer;

A common electrode provided on the planarization layer and having a plurality of holes formed in a predetermined pattern;

It is characterized in that it comprises a column spacer formed corresponding to a plurality of hole positions provided in a predetermined pattern on the common electrode.

In addition, in order to achieve the above object, a method of manufacturing a liquid crystal display device using the column spacer according to the present invention,

Forming a black matrix on the transparent insulating substrate;

Sequentially forming a color filter layer of red color, green color, and blue color on the formed black matrix;

Forming a planarization film on the color filter layer;

Depositing a transparent conductive film on the formed planarization film to form a common electrode;

Forming a hole in which a column spacer is to be formed on the formed common electrode in a predetermined pattern;

It is characterized in that it comprises the step of forming a column spacer in the formed hole.

According to the present invention as described above, the adhesive force of the column spacer formed on the pixel electrode can be improved to prevent the risk of loss, and the yield can be improved.

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

4 is a diagram schematically illustrating a liquid crystal display using a column spacer according to the present invention. As shown in the drawing, the liquid crystal display using the column spacer according to the present invention comprises: a black matrix 402 formed on the transparent insulating substrate 401; A color filter layer 403 of R, G, and B formed for color representation in the space between the black matrices; A common electrode 404 having a transparent conductive film made of ITO in a predetermined pattern on the color filter layer; And a column spacer 405 formed in a predetermined pattern on the common electrode.

Meanwhile, since a method of manufacturing a general first substrate (thin film transistor substrate) is similar to that described in the related art with reference to FIG. 1, a description thereof will be omitted, and the column spacer is formed with reference to FIGS. 5A to 5D. The manufacturing method of the 2nd board | substrate (color filter board | substrate) to be described is demonstrated. In addition, the method of manufacturing the second substrate includes a dyeing method, a dye dispersion method, a pigment dispersion method, an electrodeposition method, and the like, but the pigment deposition method will be described as an example.

5A through 5D are diagrams illustrating a first embodiment of a method of manufacturing a liquid crystal display device having a column spacer according to the present invention. As shown in FIG. 5A, a black matrix is formed by depositing a metal film on the transparent insulating substrate.

More specifically, a photosensitive film made of carbon black, titanium oxide, or the like having light shielding property is applied onto the transparent substrate 401, and the photosensitive film is exposed to a predetermined pattern using a mask. Then, the photosensitive film is developed according to the exposed pattern, and the developed photosensitive film is cured to form a BM (Black Matrix: BM) 402.

Subsequently, as shown in FIG. 5B, a color filter layer of red color R, green color G, and blue color B is sequentially formed on the formed black matrix 402.

In more detail, a photoresist film made of azo red pigment or the like is coated on the transparent substrate 401 on which the BM 202 is formed, and the photoresist film is exposed to a predetermined pattern using a mask.

Then, the photosensitive film is developed in accordance with the exposed pattern, and the developed photosensitive film is cured to form a red color (hereinafter referred to as R color).

Subsequently, a photosensitive film made of protarocyanine-based green pigment or the like is applied onto the transparent substrate on which the R color is formed, and the photosensitive film is exposed to a predetermined pattern using a mask. Then, the photosensitive film is developed in accordance with the exposed pattern, and the developed photosensitive film is cured to form a green color (hereinafter referred to as G color).

Subsequently, a photoresist film made of phthalocyanine-based blue pigment or the like is cured on the transparent substrate on which the G color is formed to form a blue color (hereinafter referred to as B color) to complete the color filter layer 403.

Subsequently, as shown in FIG. 5C, an ITO (Indium Tin Oxide) film, which is a transparent conductive film, is deposited on the formed color filter layer 403 to form a common electrode 404. Perform.

As shown in FIG. 5D, a hole having a predetermined pattern is formed on the formed common electrode 404 through an etching process on a portion where the column spacer 405 is to be formed.

Finally, as shown in FIG. 5E, a column spacer is formed in a hole formed by patterning the common electrode. Here, the column spacer 405 serves as a conventional spacer for maintaining the liquid crystal cell gap.

6 is a diagram illustrating a second embodiment of a structure of a liquid crystal display using a column spacer according to the present invention. As shown in the drawing, in the forming a hole in which the column spacer is to be formed in a predetermined pattern on the formed common electrode 604, the hole in which the column spacer 405 is to be formed is an area in which the column spacer 405 is to be formed. Form in a smaller pattern.

This is advantageous in preventing ionic foreign matters from escaping from the color filter layer.

7 is a view showing a third embodiment of the structure of a liquid crystal display device using the column spacer according to the present invention. As shown in the drawing, in the forming of the hole in which the column spacer is to be formed in the predetermined pattern on the formed common electrode 704, the hole in which the column spacer is to be formed is formed in the pattern of the uneven structure.

This is advantageous in preventing foreign matters from escaping from the color filter layer 403 and is more effective in controlling the thickness of the column spacer or improving the adhesive strength by forming ITO multi-holes in the concave-convex structure.

8 is a view showing a fourth embodiment of the structure of a liquid crystal display using the column spacer according to the present invention. As shown therein, the black matrix 802 formed on the transparent insulating substrate 801; Color filter layers 803 of R, G, and B formed for color expression in the spaces between the black matrices; A planarization film 806 formed on the color filter layer 803; A common electrode 804 having a predetermined pattern of holes in a portion where a column space is to be formed in the transparent conductive film after applying the transparent conductive film on the planarization film 806; And a column spacer 805 formed in a predetermined pattern on the common electrode 804.

In the method of manufacturing a liquid crystal display device using the column spacer as described above, a black matrix 802 is formed by depositing a metal film on the transparent insulating substrate 801, and then a red color and a red matrix, are sequentially formed on the formed black matrix 802. The color filter layer 803 of green color and blue color is formed.

In addition, an overcoat 806 is formed on the color filter layer 803.

Thereafter, a transparent conductive film is deposited on the formed planarization film 806 (overcoat) to form a common electrode 804, and a hole in which the column spacer 805 is to be formed on the formed common electrode 804 is formed in a predetermined pattern. It is formed as.

Finally, column spacers 805 are formed in the formed holes.

More specifically, an organic insulating overcoat 806 is formed on the entire surface of the substrate including the color filter layer 803, and a black resin column spacer is formed on the flattening layer 806. spacers are patterned at regular intervals throughout the substrate.

This prevents the ionic material from escaping from the color filter layer 803, and when the adhesion between the color filter layer 803 and the column spacer 805 is poor, an overcoat 806 which is an organic film having good adhesion. Can be used to improve the adhesion.

9 is a view showing a fifth embodiment of the structure of a liquid crystal display using the column spacer according to the present invention. As shown in the drawing, holes to be formed on the planarization layer 806 are formed in a pattern smaller than the area where the column spacer 805 is to be formed.

10 is a view showing a sixth embodiment of the structure of a liquid crystal display device using the column spacer according to the present invention. As shown therein, the holes to be formed on the planarization film 806 are formed in a pattern having an uneven structure.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the liquid crystal display device and the method using the column spacer according to the present invention can improve the adhesive force of the column spacer formed on the pixel electrode to prevent the risk of loss and improve the yield.

Claims (8)

A black matrix formed on the transparent insulating substrate at predetermined intervals; Color filter layers of R, G, and B formed for color expression in the space between the black matrices; A common electrode provided on the color filter layer and having a plurality of holes formed in a predetermined pattern; And a column spacer formed corresponding to a plurality of hole positions provided in a predetermined pattern on the common electrode. The method of claim 1, And the holes in which the column spacers are to be formed on the common electrode are formed in a pattern smaller than an area in which the column spacers are to be formed. The method of claim 1, The hole in which the column spacer provided on the common electrode is to be formed is a liquid crystal display device using the column spacer, characterized in that formed in a pattern of concave-convex structure. Forming a black matrix on the transparent insulating substrate; Sequentially forming a color filter layer of red color, green color, and blue color on the formed black matrix; Depositing a transparent conductive film on the formed color filter layer to form a common electrode; Forming a hole in which a column spacer is to be formed on the formed common electrode in a predetermined pattern; And forming a column spacer in the formed hole. A black matrix formed on the transparent insulating substrate at predetermined intervals; Color filter layers of R, G, and B formed for color expression in the space between the black matrices; A planarization film formed on the color filter layer; A common electrode provided on the planarization layer and having a plurality of holes formed in a predetermined pattern; And a column spacer formed corresponding to a plurality of hole positions provided in a predetermined pattern on the common electrode. The method of claim 5, And the holes in which the column spacers are to be formed on the common electrode are formed in a pattern smaller than an area in which the column spacers are to be formed. The method of claim 5, The hole in which the column spacer provided on the common electrode is to be formed, the liquid crystal display using the column spacer, characterized in that formed in a pattern of a concave-convex structure. Forming a black matrix on the transparent insulating substrate; Sequentially forming a color filter layer of red color, green color, and blue color on the formed black matrix; Forming a planarization film on the color filter layer; Depositing a transparent conductive film on the formed planarization film to form a common electrode; Forming a hole in which a column spacer is to be formed on the formed common electrode in a predetermined pattern; And forming a column spacer in the formed hole.