KR20110070565A - Liquid crystal display device and method for fabricating the same - Google Patents

Abstract

PURPOSE: A liquid crystal display and manufacturing method thereof are provided to effectively prevent static electricity by connecting a start point of a static pass of an upper plate and a lower plate and configuring electrostatic moving pass on the lower plate of a panel. CONSTITUTION: A liquid crystal display device includes as follows. A gate line and a data line which are arranged crossly to each other and is formed on a thin film transistor array substrate. A thin film transistor is comprised of a source electrode and a drain electrode which is separated as much as a channel area of an active layer. A dummy pattern(103b) is formed on the dummy pattern unit of the thin film transistor array substrate.

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR FABRICATING THE SAME}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a manufacturing method of preventing static electricity by connecting a starting point of the static path of the upper plate and the lower plate by forming an electrostatic transfer path on the lower plate of the panel. .

As the information society develops, the demand for display panels is also increasing in various forms.In response to this, liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and vacuum fluoresecent display (VFD) have been recently developed. Various flat panel display devices have been studied, and some are already used as display devices in various devices.

Among them, LCD is the most widely used as the substitute for CRT (Cathode Ray Tube) for mobile image display device because of the excellent image quality, light weight, thinness and low power consumption. In addition to the purpose, various developments have been made for televisions for receiving and displaying broadcast signals, monitors for computers, and the like.

As described above, although various technical advances have been made in order for the liquid crystal display device to serve as a screen display device in various fields, the task of improving the image quality as the screen display device has many advantages and disadvantages.

Therefore, in order to use a liquid crystal display as a general screen display device in various parts, development of high quality images such as high definition, high brightness, and large area is maintained while maintaining the characteristics of light weight, thinness, and low power consumption. can do.

In this regard, the structure of an existing liquid crystal display device will be briefly described with reference to FIG. 1 as follows.

1 is a schematic cross-sectional view illustrating a case in which an antistatic tape is attached to prevent static electricity in the structure of a liquid crystal display according to the related art.

As shown in FIG. 1, a liquid crystal display device according to the related art may be largely formed as a liquid crystal panel 10 for displaying an image and a driving unit for applying a driving signal to the liquid crystal panel. ) Is composed of first and second substrates 11 and 21 bonded to each other with a space, and a liquid crystal layer (not shown) injected between the first and second substrates 11 and 21.

The first substrate 11 (TFT array substrate) may include a plurality of gate lines in one direction at a predetermined interval, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, and the respective gates. A plurality of pixel electrodes arranged in a matrix form in each pixel region defined by crossing lines and data lines, and a plurality of thin film transistors switched by signals of the gate lines to transfer signals of the data lines to the pixel electrodes, respectively. Formed.

In addition, the second substrate 21 (color filter substrate) includes a black matrix layer for blocking light in portions other than the pixel region, an R, G, and B color filter layer for displaying color colors, and an image. A common electrode for this purpose is formed.

The first substrate 11 and the second substrate 21 as described above have a predetermined space by a spacer and are bonded by a sealant to form a liquid crystal layer between the two substrates.

In the manufacturing process of such a liquid crystal display device, static electricity causes a defect of the liquid crystal display device. Since the static electricity applies a large amount of energy to the liquid crystal display device within a very short time (tens of ns), Devices (especially the thin film transistors) provided therein are fatally damaged.

Conventionally, in order to prevent such static electricity, as shown in FIG. 1, the transparent conductive plate 23 attached to the upper plate 21 of the liquid crystal panel 10 and the lower cover 13 in which the liquid crystal panel 10 is accommodated are accommodated. Attached to the antistatic tape 31, the static electricity generated in the upper plate 21 is configured to be discharged to the outside through the antistatic tape 31 and the lower cover 13 through the transparent conductive plate 23.

However, according to the liquid crystal display and the manufacturing method according to the prior art, there are the following problems.

The liquid crystal display device with an antistatic tape according to the prior art has a workability because it requires manual work of attaching an antistatic tape to a transparent conductive plate attached to the upper plate of the liquid crystal panel and a lower cover containing the liquid crystal panel when the module is manufactured. There is a possibility that this can be lowered and the defective rate can be increased.

In the liquid crystal display device with an antistatic tape according to the related art, an electrostatic defect occurs due to the drop of the antistatic tape in a panel assembled state.

In the liquid crystal display device having the antistatic tape according to the related art, as the narrowing of the bezel is reduced, the adhesion margin of the antistatic tape is gradually reduced, thereby decreasing processability and increasing defects. .

On the other hand, in another conventional technique, when fastening a cassette tape having a gasket on the top plate between the transparent conductive plate and the bottom cover of the top plate, an increase in cost due to the gasket may occur, and the gasket in the module manufacturing state There is a fear that light leakage may occur due to pressing.

Therefore, the liquid crystal display according to the related art makes the static path of the upper plate through an external attachment, for example, an antistatic tape, in the module manufacturing process, so that a side effect occurs due to the problem. .

Accordingly, the present invention has been made to solve the above problems of the prior art, an object of the present invention is to configure the electrostatic movement path on the lower plate of the panel to connect the starting point of the electrostatic path of the upper plate and the lower plate to effectively prevent static electricity The present invention provides a liquid crystal display device and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a gate line and a data line formed on a thin film transistor array substrate including a pixel region and a dummy pattern portion and arranged to cross each other; A thin film transistor comprising a gate electrode extending from the gate line, a gate insulating film, an active layer, and a source electrode and a drain electrode formed on the active layer and spaced apart by the channel region of the active layer; A dummy pattern formed on the dummy pattern portion of the thin film transistor array substrate; A passivation layer formed on an entire surface of the substrate including the thin film transistor and the dummy pattern and having first and second contact holes exposing a drain electrode and a portion of the dummy pattern of the thin film transistor; A pixel electrode and a pad electrode formed on the passivation layer and connected to the drain electrode and the dummy pattern through the first and second contact holes, respectively; A color filter array substrate on which the thin film transistor array substrate is bonded, a transparent conductive plate on a rear surface, a color filter layer and a common electrode on a front surface thereof; And a conductive layer connecting the transparent conductive plate of the color filter array substrate and the pad electrode connected to the dummy pattern.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising: forming a gate line, a gate electrode extending from the gate line, and a dummy pattern on a thin film transistor array substrate including a pixel region and a dummy pattern portion; Forming a thin film transistor including a gate insulating film, an active layer, and a source electrode and a drain electrode formed on the active layer and spaced apart from each other by the channel region of the active layer; Forming a protective film on an entire surface of the substrate including the thin film transistor and the dummy pattern; Forming first and second contact holes in the passivation layer to expose portions of the drain electrode and the dummy pattern of the thin film transistor, respectively; Forming a pixel electrode and a pad electrode connected to the drain electrode and the dummy pattern, respectively, through the first and second contact holes on the passivation layer; Forming a transparent conductive plate on a rear surface of the color filter array substrate and forming a color filter layer and a common electrode on the front surface; Bonding the color filter array substrate and the thin film transistor array substrate to each other; And applying a conductive material to the transparent conductive plate of the color filter array substrate and the pad electrode connected to the dummy pattern to connect them to each other.

According to the liquid crystal display device and the manufacturing method thereof according to the present invention has the following advantages.

According to the present invention, a liquid crystal display and a method of manufacturing the same may form an electrostatic moving path on a lower plate of the panel to connect the starting point of the electrostatic path of the upper plate and the lower plate to effectively prevent static electricity, thereby increasing module manufacturing process efficiency. You can.

In addition, the liquid crystal display according to the present invention and a method of manufacturing the same are different from those in which the manual work of attaching an antistatic tape to the transparent conductive plate attached to the upper plate of the liquid crystal panel and the lower cover in which the liquid crystal panel is accommodated is required in manufacturing a conventional module. In contrast, since the conductive liquid is coated in a state in which the transparent conductive plate of the upper plate is brought into contact with the static electricity path of the lower plate, the antistatic structure can be manufactured, thereby automating work.

In addition, the liquid crystal display device and the method of manufacturing the same according to the present invention can reduce costs because it does not require a separate antistatic tape or gasket cost as in the prior art.

In addition, the liquid crystal display device and the method of manufacturing the same according to the present invention increase module yield and reliability by dropping an antistatic tape or removing light leakage or static electricity caused by a gasket.

On the other hand, the liquid crystal display device and the manufacturing method thereof according to the present invention can be applied to all models of the liquid crystal display device in the transverse electric field mode.

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a plan view schematically showing a liquid crystal display according to the present invention.

3 is a plan view illustrating a dummy pattern of a thin film transistor array substrate of a liquid crystal display according to the present invention.

As shown in FIG. 2, the liquid crystal display according to the present invention includes a main PCB (not shown) including a timing controller (not shown) and a power supply unit (not shown), and a main PCB (not shown) through an FPC (not shown). A data PCB (not shown) connected with a data driver, a data driver IC 160 mounted thereon, a data TCP 163 connected between a data PCB (not shown) and the liquid crystal display panel 100, and a gate driver IC. A gate TCP 153 connected to the liquid crystal display panel 100 by mounting the 150 is provided.

The liquid crystal display panel 100 is formed by bonding the thin film transistor array substrate 101 and the color filter array substrate 121 to each other with a liquid crystal interposed therebetween. The liquid crystal display panel 100 is provided with liquid crystal cells independently driven by thin film transistors in regions defined by intersections of gate lines (not shown) and data lines (not shown).

In addition, the thin film transistor supplies a pixel signal from the data line to the liquid crystal cell in response to a scan signal from the gate line.

The data drive ICs 160 are connected to data lines (not shown) via the data TCP 163 and the data pad portion of the liquid crystal display panel 100. The data drive ICs 160 convert the pixel data into analog pixel signals and supply them to the data lines.

In addition, the gate drive ICs 150 are connected to gate lines (not shown) via the gate TCP 153 and the gate pad portion of the liquid crystal display panel 100. The gate drive ICs 150 sequentially supply a gate high voltage scan signal to the gate lines. The gate drive ICs 150 supply a gate low voltage to the gate lines in a period other than a period in which the gate high voltage is supplied.

3, a dummy pattern 103b connected to the dummy pin 131 together with a dummy pin 131 in the outer region 101a of the thin film transistor array substrate 101. ) Is formed.

In addition, the dummy pattern 103b is connected to the transparent conductive plate 123 formed on the rear surface of the color filter array substrate 121 by the silver paste 143.

The structure of the liquid crystal display device according to the present invention having the above configuration will be described with reference to FIG. 4.

4 is a cross-sectional view schematically illustrating a pixel portion and a dummy pattern portion of a structure of a liquid crystal display according to the present invention.

As shown in FIG. 4, the liquid crystal display according to the present invention is largely divided into a liquid crystal panel 100 displaying an image and a driver (not shown) for applying a driving signal to the liquid crystal panel 100. The liquid crystal panel 100 is a liquid crystal injected between the thin film transistor array substrate 101 and the color filter array substrate 121 bonded to each other with a space, and the thin film transistor array substrate 101 and the color filter array substrate 121. It consists of layers (not shown).

The thin film transistor array substrate 101 may include a plurality of gate lines (not shown) in one direction and a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines (not shown) at predetermined intervals. And a plurality of pixel electrodes 119a arranged in a mattress shape in each pixel region defined by crossing each of the gate lines and the data lines and the signals of the gate lines to convert the signals of the data lines. A plurality of thin film transistors that are transferred to each pixel electrode 119a are formed.

The thin film transistor may include a gate electrode 103a extending vertically from the gate line (not shown), a gate insulating layer 105, an active layer 107, and a source electrode spaced apart from each other by a channel region on the active layer 107. 119a and the drain electrode 119b.

In addition, the dummy pattern part 101b of the thin film transistor array substrate 101 is connected to a dummy pin (not shown; refer to “131” in FIG. 3) when the gate line is formed. ) Is formed at the same time.

In addition, a passivation layer 115 is formed on an entire surface of the substrate including the thin film transistor, and the passivation layer 115 has first and second contact holes exposing the drain electrode 113b and the dummy pattern 103b of the thin film transistor. 117a and 117b are formed, respectively. In this case, a plurality of second contact holes 117b exposing the dummy pattern 103b are formed.

Furthermore, the pixel electrode 119a and the pad electrode 119b formed on the passivation layer 115 and the drain electrode 113b and the dummy pattern 103b through the first and second contact holes 117a and 117b, respectively. Is formed.

On the other hand, a transparent conductive plate 123 is formed on the back of the color filter array substrate 121, and a black matrix layer (not shown) for blocking light of portions other than the pixel area and a color matrix on the top surface thereof. The color filter layer 125 and a common electrode (not shown) for implementing an image are formed.

Although not shown in the drawing, the thin film transistor array substrate 101 and the color filter array substrate 121 have a predetermined space by a spacer (not shown) and are bonded by a sealant and a liquid crystal between the two substrates. A layer (not shown) is formed.

A method of manufacturing a liquid crystal display device according to the present invention having the above configuration will be described with reference to FIGS. 5A to 5E and FIG. 6.

5A through 5E are cross-sectional views illustrating a method of manufacturing a liquid crystal display device according to the present invention.

6 is a schematic plan view showing a state of doping a conductive liquid in the method of manufacturing a liquid crystal display device according to the present invention.

As shown in FIG. 5A, first, a gate metal layer (not shown) is deposited on the thin film transistor array substrate 101 and then selectively patterned to form a plurality of gate lines (not shown) in one direction at regular intervals. A gate electrode 103a extending from the gate line is formed. At this time, when the gate line and the gate electrode 103a are formed, the dummy pattern 103b together with the dummy pin 131 is simultaneously formed on the dummy pattern portion 101a of the thin film transistor array substrate 101. In this case, the dummy pattern 103b may be formed when forming a data line to be formed in a subsequent process.

Next, a gate insulating film 105, an active layer 107, and an ohmic contact layer (not shown) are sequentially formed on the entire surface of the substrate.

Subsequently, the ohmic contact layer and the active layer 107 are patterned to be positioned only around the gate electrode 103a.

Next, a metal material layer (not shown) is formed on the front surface of the substrate including the ohmic contact layer (not shown) and then selectively patterned to extend from the data line (not shown) together with the data line (not shown). The source electrode 113a and the drain electrode 113b spaced apart from the source electrode 113a by the channel region are formed. In this case, a portion of the ohmic contact layer (not shown), that is, a portion located above the channel region is also removed.

Subsequently, as shown in FIG. 5B, a protective film 115 is deposited by depositing an insulating material on the entire surface of the substrate and then patterned to expose portions of the drain electrode 113b and the dummy pattern 103b. Two contact holes 117a and 117b are formed at the same time. In this case, a plurality of second contact holes 117b exposing the dummy pattern 103b are formed, and the gate insulating layer 105 on the dummy pattern 103b is also removed.

Next, as illustrated in FIG. 5C, a pixel electrode connected to the drain electrode 113b and the dummy pattern 103b through the first and second contact holes 117a and 117b on the passivation layer 115, respectively. 119a and the pad electrode 119b are formed at the same time.

Subsequently, as shown in FIG. 5D, a transparent conductive plate 123 is formed on the rear surface of the color filter array substrate 121, and a black matrix layer (not shown) is formed on the front to block light of portions except the pixel region. In addition, a color filter layer 125 for expressing color colors and a common electrode (not shown) for implementing an image are sequentially formed.

Then, the thin film transistor array substrate 101 and the color filter array substrate 121 have a predetermined space by a spacer (not shown) and are bonded by a sealant, and a liquid crystal layer (not shown) between the two substrates. C) to complete the liquid crystal display manufacturing process according to the present invention.

Subsequently, as shown in FIGS. 5E and 6, the nozzle (from the edge portion of the transparent conductive plate 123 formed on the rear surface of the color filter array substrate 121 bonded to the thin film transistor array substrate 101 in a module process). The electrostatic path is formed by connecting the transparent conductive plate 123 and the pad electrode 119b by dotting a conductive liquid, for example, silver paste 143 using the 141.

In this way, the static electricity generated in the upper plate is induced to the outside through the dummy pad 119b connected by the transparent conductive plate 123 and the conductive liquid 143.

As described above, the liquid crystal display device and the method of manufacturing the same according to the present invention, by forming a static transfer path on the lower plate of the panel by connecting the starting point of the static path of the upper plate and the lower plate to effectively prevent static electricity, the module The manufacturing process efficiency can be increased.

In addition, the liquid crystal display according to the present invention and a method of manufacturing the same are different from those in which the manual work of attaching an antistatic tape to the transparent conductive plate attached to the upper plate of the liquid crystal panel and the lower cover in which the liquid crystal panel is accommodated is required in manufacturing a conventional module. Alternatively, since the silver paste is coated in a state in which the transparent conductive plate of the upper plate is brought into contact with the static electricity path of the lower plate, the antistatic structure can be manufactured, thereby automating the work.

In addition, the liquid crystal display device and the method of manufacturing the same according to the present invention can reduce costs because it does not require a separate antistatic tape or gasket cost as in the prior art.

In addition, the liquid crystal display device and the method of manufacturing the same according to the present invention increase module yield and reliability by dropping an antistatic tape or removing light leakage or static electricity caused by a gasket.

On the other hand, the liquid crystal display device and the manufacturing method thereof according to the present invention can be applied to all models of the liquid crystal display device in the transverse electric field mode.

Although the present invention has been illustrated and described with reference to preferred embodiments as described above, it should be understood by those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention. Many variations and modifications are possible. Such modifications and variations are intended to fall within the scope of the invention and the appended claims.

1 is a schematic cross-sectional view illustrating a case in which an antistatic tape is attached to prevent static electricity in the structure of a liquid crystal display according to the related art.

2 is a plan view schematically showing a liquid crystal display according to the present invention.

3 is a plan view illustrating a dummy pattern of a thin film transistor array substrate of a liquid crystal display according to the present invention.

4 is a cross-sectional view schematically illustrating a pixel portion and a dummy pattern portion of a structure of a liquid crystal display according to the present invention.

5A through 5E are cross-sectional views illustrating a method of manufacturing a liquid crystal display device according to the present invention.

6 is a schematic plan view showing a state of doping a conductive liquid in the method of manufacturing a liquid crystal display device according to the present invention.

Description of the Related Art [0002]

101: thin film transistor array substrate 103a: gate electrode

103b: dummy pattern 105: gate insulating film

107 active layer 113a source electrode

113b: drain electrode 115: protective film

117a: first contact hole 117b: second contact hole

119a: pixel electrode 119b: pad electrode

121: color filter array substrate 123: transparent conductive plate

125: color filter layer 131: dummy pin

141: nozzle 143: conductive liquid

Claims (10)

A gate line and a data line formed on the thin film transistor array substrate including the pixel region and the dummy pattern portion and arranged to cross each other; A thin film transistor comprising a gate electrode extending from the gate line, a gate insulating film, an active layer, and a source electrode and a drain electrode formed on the active layer and spaced apart by the channel region of the active layer; A dummy pattern formed on the dummy pattern portion of the thin film transistor array substrate; A passivation layer formed on an entire surface of the substrate including the thin film transistor and the dummy pattern and having first and second contact holes exposing a drain electrode and a portion of the dummy pattern of the thin film transistor; A pixel electrode and a pad electrode formed on the passivation layer and connected to the drain electrode and the dummy pattern through the first and second contact holes, respectively; A color filter array substrate on which the thin film transistor array substrate is bonded, a transparent conductive plate on a rear surface, a color filter layer and a common electrode on a front surface thereof; And And a conductive layer connecting the transparent conductive plate of the color filter array substrate and the pad electrode connected to the dummy pattern. The liquid crystal display of claim 1, wherein the dummy pattern is formed on the same layer as the gate line. The liquid crystal display of claim 1, wherein a plurality of second contact holes exposing the dummy pattern are provided. The liquid crystal display device of claim 1, wherein the dummy pattern is connected to a dummy pin formed on a dummy pattern portion of the thin film transistor array substrate. The liquid crystal display device according to claim 1, wherein the conductive layer is a conductive liquid containing silver paste. Forming a gate line, a gate electrode extending from the gate line, and a dummy pattern on the thin film transistor array substrate including the pixel region and the dummy pattern portion; Forming a thin film transistor including a gate insulating film, an active layer, and a source electrode and a drain electrode formed on the active layer and spaced apart from each other by the channel region of the active layer; Forming a protective film on an entire surface of the substrate including the thin film transistor and the dummy pattern; Forming first and second contact holes in the passivation layer to expose portions of the drain electrode and the dummy pattern of the thin film transistor, respectively; Forming a pixel electrode and a pad electrode connected to the drain electrode and the dummy pattern, respectively, through the first and second contact holes on the passivation layer; Forming a transparent conductive plate on a rear surface of the color filter array substrate and forming a color filter layer and a common electrode on the front surface; Bonding the color filter array substrate and the thin film transistor array substrate to each other; And And applying a conductive material to the transparent conductive plate of the color filter array substrate and the pad electrode connected to the dummy pattern to connect them to each other. 2. The method of claim 6, wherein the dummy pattern is formed simultaneously with the gate line. The method of claim 6, wherein a plurality of second contact holes exposing the dummy pattern are provided. The method of claim 6, wherein the dummy pattern is connected to a dummy pin formed in a dummy pattern portion of the thin film transistor array substrate. The method of claim 6, wherein the conductive material is a conductive liquid containing silver paste.

Images