KR20160067300A - Fringe field switching mode liquid crystal display device - Google Patents

Abstract

The present invention is to provide a fringe field switching (FFS) mode liquid crystal display (LCD) device capable of preventing light leakage in a non-display region. The FFS mode LCD device comprises: a first substrate divided into a display region and a non-display region; a gate line disposed on the first substrate; a gate insulating layer disposed on the first substrate and the gate line; a data line disposed on the gate insulating layer to cross the gate line; a first passivation layer disposed on the data line; a common electrode disposed on the first passivation layer; a second passivation layer disposed on an upper part of the common electrode; and an outermost pixel electrode and a dummy pixel electrode disposed on an upper part of the second passivation layer, wherein the outermost pixel electrode is disposed on an outermost portion of the display region and the dummy pixel electrode is disposed on the non-display region. The same data voltage is applied to the outermost pixel electrode and the dummy pixel electrode.

Description

[0001] The present invention relates to a Fringe field switching mode liquid crystal display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a fringe field switching mode liquid crystal display device that prevents a light leakage phenomenon in an outer area of a display area.

Description of the Related Art [0002] A liquid crystal display device is a display device using optical anisotropy and polarization properties of a liquid crystal, and is widely used in a display portion of a portable electronic device, a computer monitor, or a television.

Liquid crystals have a long and elongated molecular structure, and they have a directionality in orientation. When placed in an electric field, the orientation of molecules is changed according to their size and direction. Therefore, the liquid crystal display device includes a liquid crystal panel in which a liquid crystal layer is positioned between two substrates on which electric field generating electrodes are respectively formed, and artificially adjusts the arrangement direction of liquid crystal molecules through a change in an electric field generated between the two electrodes, And various images are displayed by changing the light transmittance.

FIGS. 1A and 1B are plan views of first and second substrates of a conventional fringe field switching mode liquid crystal display, and FIG. 2 is a cross-sectional view taken along line II-II of FIGS. 1A and 1B.

As shown in the drawing, a conventional fringe field switching mode liquid crystal display device 30 includes a first substrate 10, a corresponding second substrate 20, and a liquid crystal layer 14 provided between the two substrates And the first and second substrates 10 and 20 are divided into a display area AA and a non-display area NAA.

The first substrate 10 is also referred to as an array substrate and a thin film transistor T as a switching element is disposed in a matrix form and a gate wiring 16 and a data wiring 12 passing through the thin film transistor T are formed .

More specifically, the gate wiring 16 is disposed on the first substrate 10, and the gate insulating film 11 is disposed on the first substrate 10 and the gate wiring 16.

The data line 12 is arranged on the gate insulating film 11 so as to intersect the gate line 16 and the first protective layer 13 and the interlayer insulating film 15 are stacked on the data line 12 do.

The common electrode 19 is disposed on the interlayer insulating film 15 and the second protective layer 21 is disposed on the common electrode 19. The pixel electrode 17 is formed on the upper portion of the second protective layer 21, The dummy pixel electrode 18 is disposed in the display area AA and the dummy pixel electrode 18 is disposed in the non-display area NAA above the second protective layer 21. [

At this time, the pixel electrode 17 and the dummy pixel electrode 18 disposed on the common electrode 19 and the second passivation layer 21 are provided with openings having a plurality of bar shapes, The liquid crystal display device is driven by the fringe field expressed by the pixel electrode 17 and the common electrode 19 in the periphery of each opening of the pixel electrodes 17 and 17.

The second substrate 20 is also referred to as a color filter substrate and includes a black matrix 24 and a subcolor filter 25 which serves to distinguish between the subcolor filters 25 and to block light do.

In addition, the black matrix 24 blocks light transmitted through the non-display area NAA.

The liquid crystal layer 14 is rearranged by a signal applied from the thin film transistor T positioned on the pixel electrode 17 of the display area AA and the liquid crystal layer 14 The image is expressed in such a manner as to adjust the amount of light passing through it.

As a result, only the light transmitted through the display area AA is transmitted through the liquid crystal layer 14 to the sub-color filter 25 of the second substrate 20 to be expressed by various images.

On the other hand, when voltage is applied to the common electrode 19 and the pixel electrode 17, the liquid crystal is polarized. If this state continues, the ionic impurities in the liquid crystal are adhered to each other by the electric field, .

Accordingly, an inversion method has been proposed in which the polarity of the data voltage applied to the pixel electrode 17 is reversed to periodically reverse the polarization state of the liquid crystal located in the display area AA.

However, since the dummy pixel electrode 18 of the non-display area NAA is electrically floating, a constant voltage is applied to the common electrode 19 located below the pixel electrode 17 and the common electrode 19 19, a certain electric field is formed and maintained.

If this state continues, the ionic impurities in the liquid crystal layer 14 are fixed by the electric field, and even though the voltage is not applied to the dummy pixel electrode 18, the liquid crystal array is turned off by such an electric field.

Therefore, even when the non-display area NAA is blocked by the black matrix 24, light is transmitted through the outermost region of the display area AA to the light-shielding area a by the liquid crystal in which the alignment is changed, thereby causing defects.

This phenomenon is referred to as a light leakage phenomenon. In particular, a deficiency that the outer portion of the display area of the liquid crystal display device appears bright even in the black state due to the light leakage phenomenon occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fringe field switching mode liquid crystal display device which prevents a light leakage phenomenon that appears bright even in a black state of a display area of a liquid crystal display device, The purpose.

In order to achieve the above-mentioned object, there is provided a display device including a first substrate divided into a display region and a non-display region, a gate wiring arranged on the first substrate, a gate insulating film disposed on the first substrate and the gate wiring, A data line disposed on the insulating film so as to intersect the gate line, a first protective layer disposed on the data line, a common electrode disposed on the first protective layer, and a second protective layer disposed on the common electrode, And a dummy pixel electrode disposed on the outermost pixel electrode and the dummy pixel electrode in the non-display region, wherein the same data voltage is applied to the outermost pixel electrode and the dummy pixel electrode, And a fringe field switching mode liquid crystal display device.

The thin film transistor includes a first thin film transistor and a second thin film transistor which are connected to the gate line and the data line and include a gate electrode and a source / The drain electrode is connected to the outermost pixel electrode, and the drain electrode of the second thin film transistor is connected to the dummy pixel electrode.

And a third thin film transistor including a gate electrode and a source / drain electrode, the third thin film transistor being connected to the gate line and the data line, the drain electrode of the third thin film transistor being connected to the outermost pixel electrode and the dummy pixel electrode .

The third thin film transistor is an extended thin film transistor having a larger width and a larger length ratio than other thin film transistors.

The outermost pixel electrode and the dummy pixel electrode are provided with a plurality of openings.

In addition, the dummy pixel electrode is arranged in at least one line adjacent to the outermost pixel electrode in a direction parallel to the data line.

In addition, the dummy pixel electrode is arranged in at least one line adjacent to the outermost pixel electrode in a direction parallel to the gate line.

Also, the dummy pixel electrode is disposed so as to surround the outermost pixel electrode.

Further, the liquid crystal display device further includes a black matrix, a second substrate including a sub color filter, and a liquid crystal layer disposed between the first and second substrates, wherein the sub color filter is disposed in an area corresponding to the outermost pixel electrode , And the black matrix is disposed between the sub color filters and the non-display region of the first substrate.

The present invention prevents the liquid crystal array of the non-display area from being distorted by forming the electric field of the non-display area to be equal to the electric field of the display area, thereby allowing the light to pass from the black state to the outermost light- The light leakage phenomenon can be prevented.

1A and 1B are plan views of first and second substrates of a conventional fringe field switching mode liquid crystal display.
Fig. 2 is a cross-sectional view taken along the line II-II in Figs. 1A and 1B. Fig.
3A and 3B are plan views of first and second substrates of a fringe field switching mode liquid crystal display device according to a first embodiment of the present invention.
4 is a cross-sectional view taken along line IV-IV of FIG. 3A and FIG. 3B.
5A and 5B are plan views of the first and second substrates of the fringe field switching mode liquid crystal display of the second embodiment of the present invention.
6 is a cross-sectional view taken along the line VI-VI in Figs. 5A and 5B.
7A and 7B are plan views of first and second substrates of a fringe field switching mode liquid crystal display device according to a third embodiment of the present invention.
8 is a cross-sectional view taken along VIII-VIII of Figs. 7A and 7B.

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

≪ Embodiment 1 >

3A and 3B are plan views of first and second substrates of a fringe field switching mode liquid crystal display device according to a first embodiment of the present invention.

4 is a cross-sectional view taken along line IV-IV of FIG. 3A and FIG. 3B.

As shown in the drawing, the fringe field switching mode liquid crystal display device 300 of the present invention includes a first substrate 100, a second substrate 200 corresponding thereto, and a liquid crystal layer 114 between the first substrate 100 and the second substrate 200 And the first and second substrates 100 and 200 are divided into a display area AA for displaying an image and a non-display area NAA for surrounding the display area.

The first substrate 100 is also referred to as an array substrate and the thin film transistors T as switching elements are arranged in a matrix form and the gate lines 116 and the data lines 112 passing through the thin film transistors T are formed do.

Specifically, the gate wiring 116 is disposed on the first substrate 100, and the gate insulating film 111 is disposed on the first substrate 100 and the gate wiring 116.

The data line 112 is arranged on the gate insulating film 111 so as to intersect the gate line 116 and the first protective layer 113 and the interlayer insulating film 115 are stacked on the data line 112 do.

The common electrode 119 is disposed on the first protective layer 113 and the interlayer insulating film 115 and the second protective layer 121 is disposed on the common electrode 119.

The pixel electrode 117 and the dummy pixel electrode 118 are surrounded by the gate line 116 and the data line 112. The pixel electrode 117 is disposed on the display region And the dummy pixel electrode 118 is disposed in the non-display area NAA above the two protection layers 121. [

The thin film transistor further includes a thin film transistor (T) including a gate electrode and a source / drain electrode and disposed at an intersection of the gate wiring (116) and the data wiring (112) And the source / drain electrodes are formed of the same layer and the same material as the data lines 112. The source /

At this time, although the data voltage is applied from the data line 112 through the thin film transistor T to the pixel electrode 118, the drain electrode of the thin film transistor arranged in the non-display area NAA of the thin film transistor T, The pixel electrode 118 is electrically floated.

That is, the data voltage is not applied to the dummy pixel electrode 118 through the data line 112. As described later, at the beginning and the end of the display area AA when the alignment layer is formed on the first substrate 100, In order to prevent rubbing defects by suppressing the formation of an alignment film mount in which the thickness of the alignment film is rapidly increased.

The pixel electrode 117 and the dummy pixel electrode 118, which are disposed above the common electrode 119, are provided with openings having a plurality of bar shapes.

Accordingly, the fringe field switching mode liquid crystal display of the present invention is driven by the fringe field which is expressed by the pixel electrode 117 and the common electrode 119 in the periphery of each opening of the pixel electrode 117.

In addition, the pixel electrode 117 and the dummy pixel electrode 118 use a transparent conductive metal having a relatively high light transmittance such as indium-tin-oxide (ITO).

The second substrate 200 is also referred to as a color filter substrate and includes a black matrix 124 and a sub color filter 125. Particularly, the black matrix 124 separates the sub color filters 125 from each other, Display area NAA by dividing the area AA and the non-display area NAA into a light blocking role between the sub color filters 125 and the non-display area NAA.

Specifically, the sub color filter 125 is disposed in a region corresponding to the pixel electrode 117, and the black matrix 124 is disposed between the sub color filters 125 and the non-display area NAA of the first substrate 100, Respectively.

Accordingly, the black matrix 124 of the second substrate 200 blocks light transmitted between the subpixels and blocks the light transmitted through the non-display area NAA from being displayed.

At this time, the dummy pixel electrode 118 of the non-display area NAA is electrically floating, and a constant voltage is applied to the common electrode 119 located below the dummy pixel electrode 118, And a constant electric field is formed and held in the fixed electrode 119.

Such an electric field fixes the ionic impurities in the liquid crystal layer 114, and the liquid crystal array of the non-display area NAA may be turned off even though the voltage is not applied to the dummy pixel electrode 118.

The black matrix 124 of the non-display area NAA of the first embodiment of the present invention is extended to the light-shielding region a.

As a result, the light leakage phenomenon that the light is transmitted to the light-shielding region (a), which is the outermost portion of the display area AA, can be prevented by the liquid crystal whose arrangement is changed.

The liquid crystal layer 114 is rearranged by a signal applied from the thin film transistor T positioned on the pixel electrode 117 of the display area AA and is arranged in accordance with the rearrangement degree of the liquid crystal layer 114, The image is expressed in such a manner as to adjust the amount of light passing through the light guide plate 114.

As a result, only the light transmitted through the display area AA passes through the liquid crystal layer 114 and is transmitted through the sub-color filter 125 of the second substrate 200 to be expressed by various images.

Next, the reason why the dummy pixel electrode 118 is disposed in the non-display area NAA will be described.

On the first substrate 100, an orientation film for setting the initial alignment direction of the liquid crystal molecules is formed. The orientation film defines a rubbing direction in a set direction through a rubbing process using a rubbing cloth.

At this time, the dummy pixel electrode 118 is formed in the non-display area NAA outside the display area AA so that the thickness of the alignment layer is rapidly increased at the start and end of the display area AA when the alignment layer is formed. Can be suppressed.

As a result, the alignment film mount is suppressed in the display area AA, and the rubbing defect can be reduced.

On the other hand, the dummy pixel electrode 118 may be arranged in at least one line adjacent to the pixel electrode 117 arranged at the outermost position in the display area AA in a direction parallel to the data line 112.

At least one or more lines may be disposed adjacent to the pixel electrode 117 disposed at the outermost position in the display area AA in the direction parallel to the gate wiring 116. [

Further, the pixel electrode 117 may be disposed so as to surround the pixel electrode 117 disposed at the outermost part of the display area AA.

On the other hand, in the first embodiment of the present invention, as the black matrix 124 of the non-display area NAA extends to the light-shielding area a, the area of the outermost sub-color filter 125 of the display area AA becomes In general, since the outermost sub-color filter 125 is R (Red) or B (Blue), the aperture ratio of the R subpixel or the B subpixel may be formed to be smaller than that of the subpixels having relatively different aperture ratios.

Therefore, the aperture ratio of each subpixel constituting one pixel of the outermost portion of the display area AA may be asymmetric, which may cause an image quality defect in the outer portion of the display region.

≪ Embodiment 2 >

FIGS. 5A and 5B are plan views of first and second substrates of a fringe field switching mode liquid crystal display device according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line VI-VI of FIGS. 5A and 5B.

As shown in the drawing, the fringe field switching mode liquid crystal display device 500 of the present invention includes a first substrate 400, a second substrate 450 corresponding thereto, and a liquid crystal layer 214 between the first substrate 400 and the second substrate 450 And the first and second substrates 400 and 450 are divided into a display area AA for displaying an image and a non-display area NAA for not displaying the image.

The first substrate 400 is also referred to as an array substrate and thin film transistors T which are switching elements are arranged in a matrix form and a gate wiring 216 and a data wiring 212 passing through the thin film transistor T are formed do.

Specifically, the gate wiring 216 is disposed on the first substrate 400, and the gate insulating film 211 is disposed on the first substrate 400 and the gate wiring 216.

The first data line 212a overlaps the gate line 216 on the gate insulating layer 211 and is disposed at the outermost portion of the display region AA while the second data line 212b overlaps the gate insulating layer 211, The first passivation layer 213 and the interlayer insulating film 215 are disposed on the data wirings 212a and 212b in such a manner as to be disposed in the non-display area NAA.

The common electrode 219 is disposed on the first protective layer 213 and the interlayer insulating film 215 and the second protective layer 221 is disposed on the common electrode 219.

The outermost pixel electrode 217a is disposed at an outermost portion of the display area AA above the second passivation layer 221 and the dummy pixel electrode 218 is disposed at an outermost portion of the display area AA above the second passivation layer 221, And is disposed in the display area NAA.

At this time, the dummy pixel electrode 218 suppresses the formation of an alignment film mount in which the thickness of the alignment film is rapidly increased at the start and end portions of the display region AA when the alignment film is formed on the first substrate 400, .

The pixel electrode 217 and the dummy pixel electrode 218 including the outermost pixel electrode 217a disposed on the common electrode 219 are provided with openings having a plurality of bar- do.

Accordingly, the fringe field switching mode liquid crystal display device of the present invention is driven by the fringe field generated by the pixel electrode 217 and the common electrode 219 in the periphery of each opening of the pixel electrode 217.

In addition, the pixel electrode 217 and the dummy pixel electrode 218 use a transparent conductive metal having a relatively high light transmittance such as indium-tin-oxide (ITO).

The thin film transistor further includes a thin film transistor (T) including a gate electrode and a source / drain electrode, and disposed at the intersection of the gate line (216) and the first and second data lines (212a, 212b) The source and drain electrodes are formed of the same layer and the same material as the first and second data lines 212a and 212b.

In this case, unlike the first embodiment of the present invention, the second embodiment of the present invention differs from the first embodiment in that the drain electrode of the thin film transistor T disposed in the non-display area NAA is electrically connected to the dummy pixel electrode 218 .

The same data voltage is applied to the outermost pixel electrode 217a and the dummy pixel electrode 218 through the first and second data lines 212b and 212a, respectively.

More specifically, the first and second data drivers (not shown) further include first and second data drivers (not shown) connected to the first and second data lines 212b and 212a, respectively. The first and second data drivers The same data voltage can be applied to the outermost pixel electrode 217a and the dummy pixel electrode 218 by outputting the data voltages to the first and second data lines 212b and 212a.

The first data driver (not shown) further includes a first data driver (not shown) connected to the first and second data wirings 212b and 212a. The first data driver The same data voltage may be applied to the outermost pixel electrode 217a and the dummy pixel electrode 218 by outputting the data voltages to the pixel electrodes 212b and 212a.

Accordingly, the polarity of the data voltage applied to the dummy pixel electrode 218 is inverted in the same manner as the outermost pixel electrode 217a, and the polarization state of the liquid crystal located in the non-display area NAA is periodically inverted.

Further, since the same data voltage is applied to the dummy pixel electrode 218 and the outermost pixel electrode 217a, the same electric field is formed and the liquid crystal is arranged in the same manner.

The second substrate 450 is also referred to as a color filter substrate and includes a black matrix 224 and a sub color filter 225. Particularly, the black matrix 224 separates the sub color filters 225, The area AA and the non-display area NAA are divided to perform a light shielding function between the sub color filters 225 and the non-display area NAA.

Specifically, the sub color filter 225 is disposed in an area corresponding to the outermost pixel electrode 217a and the pixel electrode 217, and the black matrix 224 is disposed between the sub color filters 225 and the first substrate 400 Display area NAA of the display area NAA.

Accordingly, the black matrix 224 of the second substrate 450 blocks the light transmitted between the sub-pixels and blocks the light transmitted through the non-display area NAA from being displayed.

At this time, as the polarity of the data voltage applied to the dummy pixel electrode 218 is reversed as described above, the polarized state of the liquid crystal located in the non-display area NAA is also periodically inverted. Thus, Unlike the first embodiment, the ionic impurities in the liquid crystal layer 214 are not fixed by the electric field, and even if the black matrix 224 of the non-display area NAA is not extended to the light-shielding area a, It is possible to prevent a light leakage phenomenon in which the outer frame portion of the display screen of the display screen is bright even in the black state.

It is not necessary to reduce the area of the outermost sub-color filter 225 in the display area AA and the aperture ratio of the R, G, and B sub-pixels constituting one pixel at the outermost side of the display area AA is symmetric So that a defective picture quality can be prevented at the outer portion of the display area.

The liquid crystal layer 214 is rearranged by a signal applied from the thin film transistor T located on the pixel electrode 217 including the outermost pixel electrode 217a of the display area AA and the liquid crystal layer 214 The amount of light transmitted through the liquid crystal layer 214 is adjusted according to the degree of rearrangement of the liquid crystal layer 214. [

As a result, only the light transmitted through the display area AA is transmitted through the liquid crystal layer 214 to the sub-color filter 225 of the second substrate 450 to be expressed in various images.

Next, the reason why the dummy pixel electrode 218 is disposed in the non-display area NAA will be described.

On the first substrate 400, an orientation film for setting the initial alignment direction of the liquid crystal molecules is formed. The orientation film defines the rubbing direction in the set direction through the rubbing process using the rubbing cloth.

At this time, by forming the dummy pixel electrode 218 in the non-display area NAA outside the display area AA, the thickness of the alignment film formed at the beginning and the end of the display area AA is remarkably increased, Can be suppressed.

As a result, the alignment film mount is suppressed in the display area AA, and the rubbing defect can be reduced.

More specifically, the dummy pixel electrode 218 is disposed in at least one line adjacent to the outermost pixel electrode 217a disposed in the outermost portion in the display region AA in the direction parallel to the first data line 212b .

At least one or more lines may be disposed adjacent to the outermost pixel electrode 217a disposed at the outermost position in the display area AA in a direction parallel to the gate wiring 216. [

And may be disposed so as to surround the outermost pixel electrode 217a disposed at the outermost portion of the display area AA.

≪ Third Embodiment >

FIGS. 7A and 7B are plan views of first and second substrates of a fringe field switching mode liquid crystal display device according to a third embodiment of the present invention, and FIG. 8 is a sectional view taken along line VIII-VIII of FIGS. 7A and 7B.

As shown in the drawing, the fringe field switching mode liquid crystal display device 700 of the present invention includes a first substrate 600, a corresponding second substrate 650, and a liquid crystal layer 314 between the two substrates. And the first and second substrates 600 and 650 are divided into a display area AA for displaying an image and a non-display area NAA for surrounding the display area.

The first substrate 600 is also referred to as an array substrate and a thin film transistor T as a switching element is disposed in a matrix form. The gate wiring 316 passing through the thin film transistor T and the first and second data lines 312a, and 312b are formed.

Specifically, a gate wiring 316 is disposed on the first substrate 600, and a gate insulating film 311 is disposed on the first substrate 600 and the gate wiring 316.

The first data line 312a is disposed on the gate insulating film 311 and the gate line 316 is disposed on the non-display area NAA. The second data line 312b is formed on the gate insulating film 311 And crosses the gate wiring 316 and is disposed in the non-display area NAA.

The first thin film transistor Tl includes a gate electrode and a source / drain electrode and is connected to the gate wiring 316 and the first data wiring 312a. The second thin film transistor T2 is connected to the gate wiring 316 And the second data line 312b.

Further, the first protective layer 313 and the interlayer insulating film 315 are stacked on the first and second data wirings 312a and 312b.

The common electrode 319 is disposed on the interlayer insulating film 315 and the second protective layer 321 is disposed on the common electrode 319. [

The pixel electrode 317 is disposed on the second passivation layer 321 and is disposed in the display area AA and is connected to the drain electrode of the second thin film transistor T2. The pixel electrode 317 is connected to the outermost pixel electrode 317a, And the dummy pixel electrode 317a are disposed on the second passivation layer 321 and are disposed in the outermost and non-display area NAA of the display area AA and are connected to the drain electrode of the first thin film transistor T1 do.

The dummy pixel electrode 317a and the outermost pixel electrode 317a are formed on the first substrate 400 in such a manner that the thickness of the alignment layer is drastically increased at the start and end portions of the display region AA, To prevent rubbing failure and to display the pixels of the outermost sub-pixels of the display area AA.

In addition, the outermost pixel electrode 317a and the pixel electrode 317, which are disposed above the common electrode 319, are provided with openings having a plurality of bar shapes.

The fringe field switching mode liquid crystal display device of the present invention has the outermost pixel electrode 317a and the pixel electrode 317 and the common electrode 317a in the periphery of each opening of the outermost pixel electrode 317a and the pixel electrode 317, RTI ID = 0.0 > 219). ≪ / RTI >

The outermost pixel electrode 317a and the dummy pixel electrode 317a use a transparent conductive metal having a relatively high light transmittance such as indium-tin-oxide (ITO).

The gate electrodes of the first and second thin film transistors T1 and T2 are formed of the same layer and the same material as the gate wiring 216 and the source and drain electrodes are formed of the same layer and the same material as the data wiring 212 .

The first thin film transistor T1 is an extended thin film transistor having a larger channel width and a longer length ratio than the second thin film transistor T2.

 Specifically, the first thin film transistor connects the outermost pixel electrode 317a and the dummy pixel electrode 317a and applies a data voltage to these electrodes. Therefore, if the first and second thin film transistors T1 and T2 The first thin film transistor T1 may be larger in size than the second thin film transistor T2 because a charging failure of the outermost pixel electrode 317a and the dummy pixel electrode 317a may occur. It becomes possible to perform normal charging (Charging).

At this time, a data voltage corresponding to the outermost edge of the display region is applied to the outermost pixel electrode 317a and the dummy pixel electrode 317a through the first data line 312a.

Accordingly, the polarity of the data voltage applied to the outermost pixel electrode 317a and the dummy pixel electrode 317a is reversed, and the polarization state of the liquid crystal located in the non-display area NAA is periodically inverted.

Further, the same electric field is formed in the outermost portion of the display area AA and the non-display area NAA, so that the liquid crystal is arranged in the same manner.

The second substrate 650 is also referred to as a color filter substrate and includes a black matrix 324 and a sub color filter 325. Particularly, the black matrix 324 separates each sub color filter 325, The area AA and the non-display area NAA are divided to perform a light shielding function between the sub color filters 325 and the non-display area NAA.

Specifically, the sub color filter 325 is disposed in a region corresponding to the pixel electrode 317 and in the display region AA out of the outermost pixel electrode 317a and the dummy pixel electrode 317a, and the black matrix 324 Are arranged between the sub color filters 325 and the non-display area NAA of the first substrate 600, respectively.

Accordingly, the black matrix 324 of the second substrate 650 blocks the light transmitted between the subpixels and blocks the light transmitted through the non-display area NAA from being displayed.

At this time, as described above, when the drain electrode of the first thin film transistor T1 is electrically connected to the outermost pixel electrode 317a and the dummy pixel electrode 317a and a data voltage is applied thereto, The polarization state of the liquid crystal is periodically inverted.

Therefore, unlike the first embodiment, the third embodiment of the present invention differs from the first embodiment in that the black matrix 324 of the non-display area NAA does not extend to the light-shielding area a, It is possible to prevent the light leakage phenomenon that the outer portion of the display screen of the liquid crystal display device appears bright even in the black state.

It is not necessary to reduce the area of the outermost sub color filter 325 in the display area AA and the aperture ratio of the R, G, and B sub pixels constituting one pixel of the outermost part of the display area AA is symmetric So that a defective picture quality can be prevented at the outer portion of the display area.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit of the present invention.

400: first substrate 450: second substrate
212a and 212b: first and second data lines 224: black matrix
219: common electrode 225: sub color filter
221: second protective layer 214: liquid crystal layer
218: a dummy pixel electrode
217a: an outermost pixel electrode

Claims (9)

A first substrate divided into a display area and a non-display area;
A gate wiring disposed on the first substrate;
A gate insulating film disposed on the first substrate and the gate wiring;
A data line disposed on the gate insulating film so as to cross the gate line;
A first protective layer disposed on the data line;
A common electrode disposed on the first passivation layer;
A second protective layer disposed on the common electrode; And
An outermost pixel electrode disposed at an outermost portion of the display region and a dummy pixel electrode disposed in the non-display region,
And the same data voltage is applied to the outermost pixel electrode and the dummy pixel electrode.
The method according to claim 1,
And first and second thin film transistors each including a gate electrode and a source / drain electrode, the first and second thin film transistors being connected to the gate and data lines and respectively disposed in the display region and the non-display region,
Wherein the drain electrode of the first thin film transistor is connected to the outermost pixel electrode, and the drain electrode of the second thin film transistor is connected to the dummy pixel electrode.
The method according to claim 1,
And a third thin film transistor including a gate electrode and a source / drain electrode, the third thin film transistor being connected to the gate wiring and the data wiring,
And the drain electrode of the third thin film transistor is connected to the outermost pixel electrode and the dummy pixel electrode.
The method of claim 3,
Wherein the third thin film transistor is an extended thin film transistor having a channel width and a length ratio larger than other thin film transistors.
The method according to claim 1,
Wherein the outermost pixel electrode and the dummy pixel electrode have a plurality of openings.
The method according to claim 1,
Wherein the dummy pixel electrode is disposed in at least one line adjacent to the outermost pixel electrode in a direction parallel to the data line.
The method according to claim 1,
Wherein the dummy pixel electrode is disposed in at least one line adjacent to the outermost pixel electrode in a direction parallel to the gate line.
The method according to claim 1,
And the dummy pixel electrode is disposed to surround the outermost pixel electrode.
The method according to claim 1,
A second substrate including a black matrix and a sub color filter; And
Further comprising a liquid crystal layer disposed between the first and second substrates,
Wherein the sub-color filter is disposed in an area corresponding to the outermost pixel electrode, and the black matrix is disposed between the sub-color filters and the non-display area of the first substrate. Device.

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