KR101890735B1 - Fringe field switching liquid crystal display device and method of fabricating the same - Google Patents

Abstract

A Fringe Field Switching (FFS) liquid crystal display device and a method of manufacturing the same of the present invention minimize slippage of a data line by forming a slit in the same direction as the initial alignment direction of liquid crystal on a common electrode on a data line A gate line and a data line formed on the first substrate and crossing each other to define a pixel region; A pixel electrode formed in a pixel region of the first substrate; A protective layer formed on the first substrate on which the pixel electrode is formed; A common electrode formed on the first substrate on which the protective film is formed and having a plurality of first slits in each pixel region to generate a fringe field together with the pixel electrodes; A liquid crystal layer formed between the first substrate and the second substrate and having an initial alignment direction; And the second substrate bonded to be opposite to the first substrate, wherein the common electrode on the data line has a plurality of second slits in the same direction as the initial alignment direction of the liquid crystal layer.

Description

Field of the Invention [0001] The present invention relates to a fringe field type liquid crystal display device and a method of manufacturing the same. BACKGROUND OF THE INVENTION [0002]

Field of the Invention [0002] The present invention relates to a fringe field type liquid crystal display and a method of manufacturing the same, and more particularly, to a fringe field type liquid crystal display capable of realizing a high resolution and a wide viewing angle and a method of manufacturing the same.

Recently, interest in information display has increased, and a demand for using portable information media has increased, and a light-weight flat panel display (FPD) that replaces a cathode ray tube (CRT) And research and commercialization are being carried out. Particularly, among such flat panel display devices, a liquid crystal display (LCD) is an apparatus for displaying an image using the optical anisotropy of a liquid crystal, and is excellent in resolution, color display and picture quality and is actively applied to a notebook or a desktop monitor have.

The liquid crystal display comprises a color filter substrate, an array substrate, and a liquid crystal layer formed between the color filter substrate and the array substrate.

Hereinafter, a general liquid crystal display device will be described in detail with reference to the drawings.

1 is an exploded perspective view schematically showing a structure of a general liquid crystal display device.

As shown in the drawing, a typical liquid crystal display device includes a color filter substrate 5, an array substrate 10, and a liquid crystal layer (not shown) formed between the color filter substrate 5 and the array substrate 10 30).

The color filter substrate 5 includes a color filter C composed of a plurality of sub-color filters 7 implementing colors of red (R), green (G) and blue (B) A black matrix 6 for separating the sub-color filters 7 from each other and blocking light transmitted through the liquid crystal layer 30 and a transparent common And an electrode (8).

The array substrate 10 includes a plurality of gate lines 16 and data lines 17 arranged vertically and horizontally to define a plurality of pixel regions P and a plurality of gate lines 16 and data lines 17, A thin film transistor T which is a switching element formed in the intersection region and a pixel electrode 18 formed on the pixel region P. [

The color filter substrate 5 and the array substrate 10 constituted as described above are adhered to each other by a sealant (not shown) formed on the periphery of the image display area to constitute a liquid crystal panel, and the color filter substrate 5 (Not shown) formed on the color filter substrate 5 or the array substrate 10 are bonded to each other.

In this case, there is a twisted nematic (TN) method in which a nematic liquid crystal molecule is driven in a direction perpendicular to a substrate by a driving method generally used in the liquid crystal display device. However, the twisted nematic liquid crystal display Has a disadvantage that the viewing angle is as narrow as 90 degrees. This is due to the refractive anisotropy of the liquid crystal molecules, because liquid crystal molecules aligned horizontally with the substrate are oriented in a direction substantially perpendicular to the substrate when a voltage is applied to the liquid crystal panel.

There is an in-plane switching (IPS) type liquid crystal display device in which liquid crystal molecules are driven in a horizontal direction with respect to a substrate to improve a viewing angle to 170 degrees or more.

FIG. 2 is a plan view showing a part of an array substrate of a transverse electric field type liquid crystal display device in which a fringe field formed between a pixel electrode and a common electrode passes through a slit to drive liquid crystal molecules located on a pixel region and a common electrode, FIG. 1 schematically shows a part of an array substrate of a fringe field switching (FFS) liquid crystal display device embodying the present invention.

3 is a cross-sectional view schematically showing a part of an array substrate of a fringe field type liquid crystal display device, and shows a cross section cut along the line A-A 'of the array substrate shown in Fig. 2, for example.

In the fringe field type liquid crystal display device, an electric field is generated in the horizontal and vertical directions through the pixel electrode and the common electrode in a state in which the liquid crystal molecules are aligned horizontally, so that the liquid crystal molecules are twisted and tilted and driven .

Referring to the drawings, a gate line 16 and a data line 17 are formed on an array substrate 10 of a fringe field type liquid crystal display device so as to be vertically and horizontally arranged on the transparent array substrate 10 to define a pixel region And a thin film transistor, which is a switching element, is formed in a crossing region of the gate line 16 and the data line 17. [

The thin film transistor is composed of a gate electrode 21 constituting a part of the gate line 16, a source electrode 22 connected to the data line and a drain electrode 23 connected to the pixel electrode 18. The thin film transistor has a gate insulating film 15a for insulation between the gate electrode 21 and the source and drain electrodes 22 and 23 and a source electrode And an active layer 24 forming a conductive channel between the drain electrode 22 and the drain electrode 23.

At this time, the source / drain region of the active layer 24 forms an ohmic contact with the source / drain electrodes 22 and 23 through an ohmic contact layer 25n.

A common electrode 8 and a pixel electrode 18 are formed in the pixel region and the common electrode 8 is formed on the common electrode 8 to generate a fringe field together with the pixel electrode 18 in a box shape. 8 includes a plurality of slits 8s.

For reference, reference numeral 15b shown in FIG. 3 denotes a protective film.

Although not shown in the drawings, the array substrate 10 thus formed is adhered to the color filter substrate opposite to the color filter substrate by a sealant formed on the outer periphery of the image display area in a state where a certain cell gap is maintained by the column spacer. A black matrix for preventing light from leaking into the thin film transistors, gate lines and data lines, and a color filter and an overcoat layer for realizing red, green and blue colors are formed.

The fringe field type liquid crystal display device has the advantage of wide viewing angle. When the common electrode 8 is formed on the data line 17, the black matrix area can be reduced and the aperture ratio can be improved. In other words, the size of the black matrix can be minimized by shielding the data line 17 with the common electrode 8, and the aperture ratio of the pixel region can be improved.

However, when the common electrode 8 is formed on the data line 17, a capacitance is formed between the common electrode 8 and the data line 17, So that the power consumption is increased.

In addition, the signal delay of such a data line is a limitation in applying a fringe field type liquid crystal display device to a high resolution model.

SUMMARY OF THE INVENTION The present invention provides a fringe field type liquid crystal display device and a method of manufacturing the same that minimize the signal delay of a data line in a fringe field type liquid crystal display device for realizing a high resolution and a wide viewing angle .

Other objects and features of the present invention will be described in the following description of the invention and the claims.

According to an aspect of the present invention, there is provided a method of manufacturing a fringe field type liquid crystal display device, comprising: providing a first substrate and a second substrate; Forming a gate line and a data line on the first substrate, the gate line and the data line defining pixel regions intersecting with each other; Forming a pixel electrode in a pixel region of the first substrate; Forming a protective film on the first substrate on which the pixel electrode is formed; Forming a common electrode on the first substrate on which the protective film is formed and having a plurality of first slits in each pixel region to generate a fringe field together with the pixel electrodes; Forming a liquid crystal layer having an initial alignment direction between the first substrate and the second substrate; And bonding the first substrate and the second substrate. The common electrode on the data line is formed with a plurality of second slits in the same direction as the initial alignment direction of the liquid crystal layer.

In this case, the common electrode is formed in a single pattern on the first substrate.

And the pixel electrode is formed in a box shape in the pixel region.

And the common electrode on the data line is formed with the plurality of second slits in which the common electrode is selectively removed along the data line in the common electrode.

And the first slit and the data line of the common electrode are formed to have a bent structure.

In this case, the first slit and the data line of the common electrode having the bent structure are inclined at a predetermined angle with respect to the initial alignment direction of the liquid crystal layer.

A fringe field type liquid crystal display device of the present invention includes a gate line and a data line formed on a first substrate and defining a pixel region intersecting with each other; A pixel electrode formed in a pixel region of the first substrate; A protective layer formed on the first substrate on which the pixel electrode is formed; A common electrode formed on the first substrate on which the protective film is formed and having a plurality of first slits in each pixel region to generate a fringe field together with the pixel electrodes; A liquid crystal layer formed between the first substrate and the second substrate and having an initial alignment direction; And the second substrate bonded to be opposite to the first substrate, wherein the common electrode on the data line has a plurality of second slits in the same direction as the initial alignment direction of the liquid crystal layer.

In this case, the common electrode is formed in a single pattern on the first substrate.

And the pixel electrode is formed in a box shape in the pixel region.

And the common electrode on the data line has the plurality of second slits in which the common electrode is selectively removed along the data line in the common electrode.

And the first slit and the data line of the common electrode have a folded structure.

In this case, the first slit and the data line of the common electrode having the bent structure are inclined at a predetermined angle with respect to the initial alignment direction of the liquid crystal layer.

As described above, the fringe field type liquid crystal display device and the method of manufacturing the same according to the present invention are characterized in that the slit is formed in the common electrode on the data line to minimize the capacitance between the data line and the common electrode. Thereby minimizing the signal delay of the data line and reducing power consumption.

In addition, since the slits of the common electrode are formed in the same direction as the initial alignment direction of the liquid crystal, the fringe field type liquid crystal display device and the method of manufacturing the same according to the present invention can prevent the liquid crystal from being distorted even when an electric field is applied, Thereby preventing screen distortion of the screen.

1 is an exploded perspective view schematically showing a structure of a general liquid crystal display device.
2 is a plan view schematically showing a part of an array substrate of a fringe field type liquid crystal display device.
3 is a cross-sectional view schematically showing a part of an array substrate of a fringe field type liquid crystal display device.
4 is a plan view schematically showing a part of an array substrate of a fringe field type liquid crystal display device according to a first embodiment of the present invention.
5 is a cross-sectional view schematically showing a part of an array substrate of a fringe field type liquid crystal display device according to a first embodiment of the present invention.
6 is a plan view schematically showing a part of an array substrate of a fringe field type liquid crystal display device according to a second embodiment of the present invention.
7 is a cross-sectional view schematically showing a part of an array substrate of a fringe field type liquid crystal display device according to a second embodiment of the present invention.
FIG. 8 is an enlarged plan view of a part of the array substrate shown in FIG. 6; FIG.
FIGS. 9A to 9E are plan views sequentially showing the manufacturing steps of the array substrate shown in FIG. 6; FIG.
10A to 10E are sectional views sequentially showing the steps of manufacturing the array substrate shown in FIG. 7;

Hereinafter, preferred embodiments of a fringe field type liquid crystal display device and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

FIG. 4 is a plan view schematically showing a part of an array substrate of a fringe field type liquid crystal display device according to a first embodiment of the present invention, in which a fringe field formed between a pixel electrode and a common electrode passes through a slit, And Fig. 7 shows a part of an array substrate of a fringe field type liquid crystal display device which implements an image by driving liquid crystal molecules located on the fringe field type liquid crystal display device.

At this time, in an actual liquid crystal display device, N number of gate lines and M number of data lines intersect to form MxN pixels, but one pixel is shown in the drawing for simplicity of explanation.

In this case, as shown in FIG. 4, when the common electrode and the pixel electrode have a bent structure, the liquid crystal molecules are arranged in two directions to form a two-domain structure, thereby further improving the viewing angle compared to the mono-domain. However, the present invention is not limited to the fringe field type liquid crystal display device having the two-domain structure, and the present invention is applicable to a fringe field type liquid crystal display device having a multi-domain structure of two or more domains.

5 is a cross-sectional view schematically showing a part of an array substrate of the fringe field type liquid crystal display device according to the first embodiment of the present invention. The cross-sectional view taken along line B-B 'of the array substrate shown in FIG. For example.

Referring to the drawings, a gate line 116 and a data line 117, which are vertically and horizontally arranged on the transparent array substrate 110 to define a pixel region, are formed on the array substrate 110 according to the first embodiment of the present invention. Respectively. In addition, a thin film transistor, which is a switching device, is formed in the intersection region of the gate line 116 and the data line 117. Inside the pixel region, a pixel electrode 118 for driving liquid crystal molecules by generating a fringe field, The common electrode 108 having the slits 108s and 108s' of the pixel electrode 108 is formed.

The thin film transistor includes a gate electrode 121 constituting a part of the gate line 116, a source electrode 122 connected to the data line 117 and a drain electrode 123 connected to the pixel electrode 118 . The thin film transistor includes a gate insulating layer 115a for insulation between the gate electrode 121 and the source and drain electrodes 122 and 123 and a source electrode And an active layer 124 that forms a conduction channel between the drain electrode 122 and the drain electrode 123. 4, the source electrode 122 has a U-shaped shape, and the active layer 124 has a U-shaped channel shape. However, the present invention is not limited thereto. The present invention is applicable irrespective of the channel shape of the active layer 124.

At this time, the source / drain regions of the active layer 124 form ohmic contacts with the source / drain electrodes 122 and 123 through the ohmic-contact layer 125n.

A part of the source electrode 122 extends in one direction to constitute the data line 117. A part of the drain electrode 123 extends toward the pixel region and is electrically connected to the pixel electrode 118. [ . However, the present invention is not limited thereto, and the drain electrode 123 may be electrically connected to the pixel electrode 118 through a contact hole.

As described above, the common electrode 108 and the pixel electrode 118 are formed in the pixel region to generate a fringe field. At this time, the common electrode 108 is formed in a single pattern over the entire pixel portion And a plurality of first slits 108s are formed in each pixel region, and the pixel electrodes 118 are formed in a box shape in a pixel region.

Particularly, in the fringe field type liquid crystal display device according to the first embodiment of the present invention, a part of the common electrode 108 is removed along the data line 117 in the common electrode 108 above the data line 117 The second slit 108s' is formed to minimize the capacitance between the data line 117 and the common electrode 108 of the conventional structure. Accordingly, the signal delay of the data line can be minimized and the power consumption can be reduced.

That is, a protective film 115b, which is a dielectric material, exists between the data line 117 made of a conductive material and the common electrode 108 to form a capacitance. In order to solve this problem, in the first embodiment of the present invention, The electrode 108 is removed along the data line 117 at the lower portion thereof.

In the first embodiment of the present invention, the first and second slits 108s and 108s', the pixel electrode 118 and the data line 117 of the common electrode 108 are formed in a bent structure, By forming the multi-domain structure in which the driving directions are symmetrical, it is possible to minimize the phenomenon of color shift by offsetting the abnormal light due to the birefringence characteristic of the liquid crystal. That is, embolization occurs depending on the field of view of the liquid crystal molecules due to the birefringence characteristic of the liquid crystal molecules. In particular, a yellow shift is observed in the minor axis direction of the liquid crystal molecule, and a blue shift shift is observed. Therefore, when the short axis and the long axis of the liquid crystal molecule are appropriately arranged, the birefringence value can be compensated to reduce embolization.

In the fringe field type liquid crystal display device according to the first embodiment of the present invention configured as described above, a signal of the data line 117 and a signal of the common electrode (not shown) are transmitted through the second slit 108s' formed along the data line 117 108 and the pixel electrode 118 is generated to generate a light leakage in a dark state or a distorted image may be displayed.

According to the second embodiment of the present invention, since the second slits of the common electrode are divided into a plurality of portions and formed in the same direction as the initial alignment direction of the liquid crystal, it is possible to prevent the liquid crystal from being distorted even when an electric field is applied. Will be described in detail with reference to FIG.

6 is a plan view schematically showing a part of an array substrate of a fringe field type liquid crystal display device according to a second embodiment of the present invention.

At this time, in an actual liquid crystal display device, N number of gate lines and M number of data lines intersect to form MxN pixels, but one pixel is shown in the drawing for simplicity of explanation.

At this time, when the common electrode and the pixel electrode have a bending structure, the liquid crystal molecules are arranged in two directions to form a 2-domain, thereby further improving the viewing angle as compared with the mono-domain. However, the present invention is not limited to the fringe field type liquid crystal display device having the two-domain structure, but the present invention is applicable to the fringe field type liquid crystal display device having the multi-domain structure having two or more domains.

7 is a cross-sectional view schematically showing a part of an array substrate of a fringe field type liquid crystal display device according to a second embodiment of the present invention. The cross-sectional view taken along line C-C 'of the array substrate shown in FIG. 6 For example.

8 is an enlarged plan view showing a part P of the array substrate shown in Fig.

The fringe field type liquid crystal display device according to the second embodiment of the present invention shown in FIGS. 6 to 8 has the same structure as that of the first embodiment of the present invention except for the shape of the second slit formed on the common electrode. As shown in Fig.

In other words, referring to the drawings, the array substrate 210 according to the second embodiment of the present invention includes a gate line 216 and a data line 217 which are vertically and horizontally arranged on the transparent array substrate 210, Is formed. A thin film transistor, which is a switching device, is formed in the intersection region of the gate line 216 and the data line 217. In the pixel region, a pixel electrode 218 for driving the liquid crystal molecules by generating a fringe field, A common electrode 208 having slits 208s and 208s' is formed.

The thin film transistor includes a gate electrode 221 constituting a part of the gate line 216, a source electrode 222 connected to the data line 217 and a drain electrode 223 connected to the pixel electrode 218 . The thin film transistor includes a gate insulating film 215a for insulation between the gate electrode 221 and the source and drain electrodes 222 and 223 and a source electrode 222 and a drain electrode 223 formed on the substrate. 6, the source electrode 222 has a U-shaped shape, and the active layer 224 has a U-shaped channel shape. However, the present invention is not limited thereto. The present invention is applicable irrespective of the channel shape of the active layer 224.

At this time, the source / drain regions of the active layer 224 form ohmic contacts with the source / drain electrodes 222 and 223 through the ohmic-contact layer 225n.

A part of the source electrode 222 extends in one direction to constitute the data line 217. A part of the drain electrode 223 extends toward the pixel region and is electrically connected to the pixel electrode 218. [ . However, the present invention is not limited thereto, and the drain electrode 223 may be electrically connected to the pixel electrode 218 through a contact hole.

As described above, a common electrode 208 and a pixel electrode 218 are formed in the pixel region to generate a fringe field. At this time, the common electrode 208 is formed in a single pattern over the entire pixel portion The pixel electrode 218 is formed to have a plurality of first slits 208s in each pixel region, and the pixel electrode 218 is formed in a box shape within the pixel region.

Particularly, in the fringe field type liquid crystal display device according to the second embodiment of the present invention, part of the common electrode 208 is removed along the data line 217 in the common electrode 208 above the data line 217 A plurality of second slits 208s' are formed so as to minimize the capacitance between the data line 217 and the common electrode 208 of the conventional structure. Accordingly, the signal delay of the data line can be minimized and the power consumption can be reduced.

That is, a protective film 215b, which is a dielectric material, exists between the data line 217 made of a conductive material and the common electrode 208 to form a capacitance. In order to solve this problem, in the second embodiment of the present invention, The common electrode 208 is removed along the lower data line 217 as in the first embodiment of the present invention.

The second embodiment of the present invention is different from the first embodiment of the present invention in that the second slits 208s' of the common electrode 208 are divided into a plurality of portions to form an initial alignment direction (1) Or in the same direction as the rubbing direction (3), the liquid crystal can not be arranged in a specific electric field direction even if an electric field is applied, thereby preventing the liquid crystal from being distorted. As a result, it is possible to prevent screen distortion such as light leakage. That is, if the initial alignment direction (1) of the liquid crystal and the inclined direction (3) of the second slit 208s' of the common electrode 208 are the same, no liquid crystal is driven do. If the initial alignment direction (1) of the liquid crystal and the tilted direction (3) of the second slit 208s' are different from each other, there is a liquid crystal acting when an electric field is applied, so that the electric field is distorted.

The data line 217 and the first slit 208s are arranged in a direction perpendicular to the initial direction of the liquid crystal, And is inclined in a predetermined direction (2) with respect to the alignment direction (1).

In the second embodiment of the present invention, the first slits 208s, the pixel electrodes 218 and the data lines 217 of the common electrode 208 are formed in a bent structure so that the driving directions of the liquid crystal molecules are symmetrical By forming the multi-domain structure, the abnormal light due to the birefringence characteristic of the liquid crystal can be canceled out to minimize the embolization phenomenon.

Hereinafter, a manufacturing method of a fringe field type liquid crystal display device according to a second embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 9A to 9E are plan views sequentially showing the manufacturing steps of the array substrate shown in FIG. 6, and FIGS. 10A to 10E are sectional views sequentially showing the manufacturing steps of the array substrate shown in FIG.

As shown in FIGS. 9A and 10A, a gate electrode 221 and a gate line 216 are formed on an array substrate 210 made of a transparent insulating material such as glass.

At this time, the gate electrode 221 and the gate line 216 are formed by selectively depositing a first conductive film on the entire surface of the array substrate 210 and then performing a photolithography process (a first mask process).

The first conductive layer may include at least one selected from the group consisting of aluminum (Al), aluminum alloy (Al alloy), tungsten (W), copper (Cu), chromium (Cr), molybdenum Or a low-resistance opaque conductive material such as an alloy or the like. The first conductive layer may have a multi-layer structure in which two or more low-resistance conductive materials are stacked.

Next, as shown in FIGS. 9B and 10B, a gate insulating film 215a, an amorphous silicon thin film and an n + amorphous silicon thin film are formed on the entire surface of the array substrate 210 on which the gate electrode 221 and the gate line 216 are formed .

Thereafter, the amorphous silicon thin film and the n + amorphous silicon thin film are selectively removed through a photolithography process (second mask process) to form an active layer made of the amorphous silicon thin film on the gate electrode 221 of the array substrate 210 224).

At this time, the n + amorphous silicon thin film pattern 225 formed of the n + amorphous silicon thin film and patterned in the same manner as the active layer 224 is formed on the active layer 224.

Next, as shown in FIGS. 9C and 10C, a second conductive film is formed on the entire surface of the array substrate 210 on which the active layer 224 and the n + amorphous silicon thin film pattern 225 are formed.

At this time, the second conductive layer may be formed of a low-resistance opaque conductive material such as copper, a copper alloy, or aluminum to form a source electrode, a drain electrode, and a data line. The second conductive layer may be formed in a multi-layered structure in which two or more low-resistance conductive materials are stacked.

Thereafter, the n + amorphous silicon thin film and the second conductive film are selectively removed through a photolithography process (a third mask process) to form a source electrode 222 and a drain electrode (not shown) of the second conductive film on the active layer 224 223).

In addition, a data line 217 defining a pixel region together with the gate line 216 is formed on the array substrate 210 through the third mask process.

At this time, an ohmic contact layer 225n is formed on the active layer 224 for ohmic-contacting the source / drain region of the active layer 224 and the source / drain electrodes 222 and 223.

The second embodiment of the present invention differs from the second embodiment in that the active layer 224, the ohmic-contact layer 225n and the data lines, that is, the source electrode 222 and the drain electrode 223 and the data line 217, But the present invention is not limited thereto. The active layer 224, the ohmic contact layer 225n, and the data line may be formed by a single mask process using a half tone mask or a diffraction mask.

Next, as shown in FIGS. 9D and 10D, a third conductive film is formed on the entire surface of the array substrate 210 on which the active layer 224, the source / drain electrodes 222 and 223, and the data line 217 are formed do.

The third conductive layer may be formed of a transparent conductive material having a high transmittance such as indium tin oxide (ITO) or indium zinc oxide (IZO) to form a pixel electrode. have.

Thereafter, the third conductive film is selectively removed through a photolithography process (fourth mask process), thereby forming a pixel electrode 218 made of the third conductive film in the pixel region and electrically connected to the drain electrode 223, .

At this time, the ohmic contact layer 225n may be formed on the active layer 224 by selectively removing the n + amorphous silicon thin film through the fourth mask process.

Although the pixel electrode 218 is formed after forming the data line in the second embodiment of the present invention, the present invention is not limited thereto, and the pixel electrode 218 may be formed by forming the pixel electrode 218 The data wiring may be formed later.

After the pixel electrode 218 is formed as described above, a protective film 215b is formed on the entire surface of the array substrate 210, as shown in Figs. 9E and 10E.

In this case, the protective layer (215b) may be formed of an organic insulating film such as formed of an inorganic insulating film or an acrylic photo, such as a silicon nitride film (SiNx), silicon oxide (SiO _2).

A fourth conductive layer is formed on the entire surface of the array substrate 210 on which the protective layer 215b is formed.

At this time, the fourth conductive layer may be formed of a transparent conductive material having a high transmittance such as indium-tin-oxide or indium-zinc-oxide to form a common electrode.

Thereafter, the fourth conductive film is selectively removed through a photolithography process (fifth mask process), thereby forming the common electrode 208 made of the fourth conductive film in the pixel portion of the array substrate 210.

At this time, the common electrode 208 is formed in a single pattern over the entire pixel portion, while a plurality of first slits 208s (in the pixel region) are formed in each pixel region to generate a fringe field together with the pixel electrode 218 thereunder. As shown in Fig.

The common electrode 208 on the data line 217 is connected to the common electrode 208 along the data line 217 in order to minimize the capacitance between the data line 217 and the common electrode 208, Is formed so as to have a plurality of second slits 208s '

Particularly, the second slit 208s' of the common electrode 208 is divided into a plurality of portions in order to prevent screen distortion such as light leakage, and is formed in the same direction as the initial alignment direction of the liquid crystal.

Although not shown in the figure, the array substrate 210 thus formed is adhered to the color filter substrate opposite to the color filter substrate by a sealant formed on the periphery of the image display region in a state where a certain cell gap is maintained by the column spacer, The filter substrate is formed with a black matrix for preventing light from leaking into the thin film transistor, the gate line and the data line, and a color filter and an overcoat layer for realizing red, green and blue colors.

Although the fringe field type liquid crystal display device according to the first and second embodiments of the present invention has been described by taking an amorphous silicon thin film transistor using an amorphous silicon thin film as an active layer, the present invention is not limited thereto, Is applied to the polycrystalline silicon thin film transistor and the oxide thin film transistor using the polycrystalline silicon thin film and the oxide semiconductor as the active layer.

In addition, the present invention can be applied not only to a liquid crystal display device but also to other display devices manufactured using thin film transistors, for example, organic electroluminescent display devices in which organic light emitting diodes (OLEDs) have.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

108, 208: common electrodes 108s, 208s, 108s'208s'
110, 210: array substrate 116, 216: gate line
117, 217: Data lines 118, 218:
121, 221: gate electrodes 122, 222: source electrode
123, 223: drain electrode 124, 224: active layer

Claims (12)

Providing a first substrate and a second substrate;
Forming a gate line and a data line on the first substrate, the gate line and the data line defining pixel regions intersecting with each other;
Forming a pixel electrode in a pixel region of the first substrate;
Forming a protective film covering the pixel electrode on the first substrate;
Forming a common electrode on the protective film;
Forming a liquid crystal layer having an initial alignment direction between the first substrate and the second substrate; And
And bonding the first substrate and the second substrate,
The common electrode
A plurality of first slits disposed in respective pixel regions and for generating fringe fields together with the pixel electrodes,
And a plurality of second slits overlapping the data lines and arranged in the same direction as the initial alignment direction of the liquid crystal layer,
Wherein the plurality of second slits are disposed in different directions from the data lines. The method according to claim 1, wherein the common electrode is formed in a single pattern on the first substrate. The manufacturing method of a fringe field type liquid crystal display device according to claim 1, wherein the pixel electrode is formed in a box shape within the pixel region. delete The method of claim 1, wherein the plurality of first slits and data lines of the common electrode are formed to have a bent structure. 6. The method of claim 5, wherein the first slits and the data lines of the common electrode having the bent structure are inclined at a predetermined angle with respect to the initial alignment direction of the liquid crystal layer. A gate line and a data line formed on the first substrate and defining pixel regions crossing each other;
A pixel electrode formed in a pixel region of the first substrate;
A protective layer formed on the first substrate on which the pixel electrode is formed and covering the pixel electrode;
A common electrode formed on the protective film;
A liquid crystal layer formed between the first substrate and the second substrate and having an initial alignment direction; And
And the second substrate bonded to the first substrate so as to be opposite to the first substrate,
The common electrode
A plurality of first slits disposed in respective pixel regions and for generating fringe fields together with the pixel electrodes,
And a plurality of second slits overlapping the data lines and arranged in the same direction as the initial alignment direction of the liquid crystal layer,
Wherein the plurality of second slits are arranged in a direction different from the data lines. delete 8. The fringe field type liquid crystal display of claim 7, wherein the pixel electrode is formed in a box shape in the pixel region. delete 8. The fringe field type liquid crystal display of claim 7, wherein the plurality of first slits and data lines of the common electrode have a bent structure. 12. The fringe field type liquid crystal display of claim 11, wherein the first slits and the data lines of the common electrode having the bent structure are inclined at a predetermined angle with respect to the initial alignment direction of the liquid crystal layer.

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