KR101320498B1 - Liquide crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having an improved aperture ratio by changing a pixel shape and a storage capacitor structure.

The present invention provides a liquid crystal display comprising: a first substrate; A gate line and a data line intersecting longitudinally and horizontally on the first substrate to define a plurality of pixels, and the gate line disposed in each pixel being longer than the data line; A first storage electrode provided for each pixel and connected to a gate line of an adjacent pixel; A common voltage line parallel to the data line and intersecting the gate line; A common voltage partial line connected to the common voltage line and overlapping the common voltage line; A plurality of common electrodes branched from the common voltage partial line to be parallel to the gate line, a part of the common electrode overlapping the gate line; A pixel electrode formed to cross the common electrode to form a horizontal electric field together with the common electrode; A second storage electrode connected to the pixel electrode and overlapping the first storage electrode; Lt; / RTI > Each pixel further includes a third storage electrode connected to the common voltage partial line and overlapping the second storage electrode.

Liquid crystal display, aperture ratio

Description

[0001] LIQUIDE CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having improved aperture ratio by changing a shape of a pixel and a structure of a storage capacitor.

Generally, the liquid crystal display device has a tendency of widening its application range due to features such as light weight, thinness, and low power consumption driving. Accordingly, liquid crystal display devices are widely used as portable computers such as notebook PCs, office automation devices, and audio / video devices.

In general, a liquid crystal display device displays a desired image on a screen by controlling a light transmission amount according to a video signal applied to a plurality of switching elements for control arranged in a matrix form.

The liquid crystal display device includes a liquid crystal panel in which a color filter substrate as an upper substrate and a thin film transistor array substrate as a lower substrate face each other and a liquid crystal layer is filled therebetween; And a liquid crystal panel driver for supplying signals and image information to operate the liquid crystal panel.

The liquid crystal display device having such a structure is classified into various modes according to the arrangement of liquid crystal and the arrangement of the electrodes for applying an electric field to the liquid crystal, and the modes mainly used are TN (twisted namatic) mode and IPS switching mode.

The TN mode liquid crystal display device is arranged so that the initial orientation of the liquid crystal is twisted in a spiral manner from the bottom to the top, and electrodes are formed on the upper and lower substrates to apply a vertical electric field to the liquid crystal. In the IPS mode liquid crystal display device, the initial alignment of the liquid crystal is arranged horizontally on the substrate, and electrodes are all formed on the lower substrate to apply a horizontal electric field to the liquid crystal.

The liquid crystal display of the TN mode most widely used among the liquid crystal display devices of the various modes has a serious disadvantage that the viewing angle is narrow and recently the use of the IPS mode liquid crystal display device having the wide viewing angle has been increasing There is a trend.

Hereinafter, a conventional IPS mode liquid crystal display device will be described with reference to FIG.

1 is a plan view illustrating a conventional general liquid crystal display device.

As shown in FIG. 1, a general liquid crystal display device includes a first substrate 1 as a thin film transistor array substrate and a second substrate (not shown) as a color filter substrate, and are vertically and horizontally disposed on the first substrate 1. The gate line 2 and the data line 3 defining the plurality of pixels are formed to cross each other.

A thin film transistor is provided at a point where the gate line 2 and the data line 3 of each pixel cross each other, and the drain terminal of the thin film transistor 8 is formed in a direction parallel to the data line 3. ).

A common voltage line 5 is formed on the first substrate 1 in parallel with the gate line 2, and is branched from the common voltage line 5 to be parallel to the data line 3. The common electrode 7 is also provided.

The pixel electrode 8 is formed in parallel with the data line 3 as described above, and is formed in parallel with the gate line 2 to form first and second storage capacitors Cst1 and Cst2. It is divided into a second area and a third area.

The common electrode 7 overlaps the first region and the first region or the second region of the pixel electrode 8 and the first storage capacitor Cst1 formed in parallel with the data line 3 as described above. Alternatively, the display apparatus may be divided into a second region and a third region that form the second storage capacitor Cst2.

In the conventional general liquid crystal display device having the above configuration, in order to prevent a problem that the driving of the liquid crystal is distorted due to the data signal transmitted through the data line 3 and is observed as a screen defect, the common electrode 7 A portion of the first region is formed to be thick adjacent to the left and right sides of the data line 3, and thus, the aperture ratio of the liquid crystal display device is lowered, thereby reducing the screen quality of the liquid crystal display device.

Accordingly, an aspect of the present invention is to solve the problems of the prior art, and an object of the present invention is to provide a liquid crystal display device having an improved aperture ratio by changing a shape of a pixel and a structure of a storage capacitor.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a first substrate; A gate line and a data line intersecting the first substrate vertically and horizontally to define a plurality of pixels, and the gate line disposed in each pixel being longer than the data line; A first storage electrode provided for each pixel and connected to a gate line of an adjacent pixel; A common voltage line parallel to the data line and intersecting the gate line; A common voltage partial line connected to the common voltage line and overlapping the common voltage line; A plurality of common electrodes branched from the common voltage partial line to be parallel to the gate line, a part of the common electrode overlapping the gate line; A pixel electrode formed to cross the common electrode to form a horizontal electric field together with the common electrode; A second storage electrode connected to the pixel electrode and overlapping the first storage electrode; . Each pixel further includes a third storage electrode connected to the common voltage partial line and overlapping the second storage electrode.

In addition, the liquid crystal display according to another embodiment of the present invention for achieving the above object, the first substrate; A gate line and a data line intersecting longitudinally and horizontally on the first substrate to define a plurality of pixels, and the gate line disposed in each pixel being longer than the data line; A common voltage line parallel to the data line and formed to cross the gate line; A plurality of common electrodes formed in connection with the common voltage line; A pixel electrode formed to cross the common electrode to form a horizontal electric field together with the common electrode; A storage electrode connected to the pixel electrode and overlapping a portion of the common voltage line; .

The liquid crystal display device according to the preferred embodiment of the present invention having the above configuration has the effect of improving the display quality of the liquid crystal display device by changing the shape of the pixel and the storage capacitor.

In more detail, the liquid crystal display according to the present invention forms each pixel to have an elongate shape in a direction parallel to the gate line, so that the common voltage line and the common voltage partial line disposed adjacent to the data line in each pixel. And the area occupied by the common electrode is minimized to improve the aperture ratio.

The reason why the common voltage line, the common voltage partial line, and a part of the common electrode are disposed adjacent to the data line in each pixel is that the driving of the liquid crystal is distorted due to the data signal transmitted through the data line, which is observed as a screen defect. This is to prevent the phenomenon.

In addition, since each pixel is formed to have a long shape in a direction parallel to the gate line, the number of gate lines increases, but the number of data lines decreases, thereby reducing the number of data drive integrated circuits having a complicated configuration. There is this.

In addition, the liquid crystal display according to the present invention forms a portion of the common electrode branched from the common voltage partial line of the first substrate, that is, the thin film transistor array substrate so as to overlap the gate line, thereby providing a gate signal transmitted through the gate line. As a result, the driving of the liquid crystal is distorted, thereby preventing the phenomenon of being observed as a screen defect.

Accordingly, it is possible to minimize the area of the black matrix formed on the second substrate so as to overlap the upper portion of the gate line or not to form the black matrix.

The liquid crystal display according to the present invention includes a first storage electrode connected to a gate line of an adjacent pixel, a second storage electrode connected to a pixel electrode and overlapping the first storage electrode with a gate insulating layer interposed therebetween; Since the dual storage capacitor is formed by providing a third storage electrode connected to the common voltage partial line and overlapping the second storage electrode with the passivation layer therebetween, the area of the storage capacitor provided in each pixel is minimized. There is an advantage that the aperture ratio is improved.

In the liquid crystal display according to the present invention, the common voltage line is formed parallel to the data line at the center of the pixel, so that the common voltage line and the data line are formed of the same material in the same layer during the manufacturing process. The shortcomings of the data line and the occurrence of the defect are minimized.

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

≪ Embodiment 1 >

First, the liquid crystal display according to the first embodiment of the present invention will be described with reference to FIGS. 2 and 3.

2 is a plan view illustrating a liquid crystal display according to a first exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view illustrating a plane taken along line II ′ of FIG. 2.

2 and 3, the liquid crystal display according to the first embodiment of the present invention, the first substrate 101; The gate line 102 and the data line 103 formed longer than the data line 103 are formed on the first substrate 101 by crossing horizontally and horizontally to define a plurality of pixels, and the gate line 102 disposed in each pixel. ; A first storage electrode 112 provided for each pixel and connected to a gate line 102 of an adjacent pixel; A common voltage line 105 formed to be parallel to the data line 103 and to cross the gate line 102; A common voltage partial line 106 connected to the common voltage line 105 and overlapping the common voltage line 105; A common electrode 107 branched into the plurality of common voltage partial lines 106 and formed in parallel with the gate line 102, a part of which is overlapped with the gate line 102; A pixel electrode 108 formed to cross the common electrode 107 to form a horizontal electric field together with the common electrode 107; A second storage electrode 118 connected to the pixel electrode 108 and overlapping the first storage electrode 112; .

The liquid crystal display according to the present invention comprises a first substrate 101, which is a thin film transistor array substrate, and a second substrate (not shown), which is a color filter substrate, and a liquid crystal between the first substrate 101 and the second substrate. A layer (not shown) is formed.

Referring to FIG. 2, a gate line 102 and a data line 103 are formed on the first substrate 101 so as to intersect longitudinally and horizontally to define a plurality of pixels, and each pixel includes a gate line 102 and data. The thin film transistor is formed in an area where the lines 103 intersect.

Referring to FIG. 3, the thin film transistor may include a gate electrode 122 formed on the first substrate 101, a gate insulating layer 150 formed on the gate electrode 122, and the gate formed on the gate insulating layer 150. The semiconductor layer 160 is formed to overlap the electrode 122, and the source electrode 113 and the drain electrode 140 formed on the semiconductor layer 160. The source electrode 113 and the drain electrode 140 are formed. On the protective layer 170 is further formed.

Here, the gate electrode 122 of the thin film transistor is connected to the gate line 102, the source electrode 113 is connected to the data line 103, and the drain electrode 140 is connected to the pixel through the contact hole 109. It is connected to the electrode 108.

When the direction in which the gate line 102 is formed is referred to as the horizontal direction, each pixel has a long shape in the horizontal direction, and the pixels displaying red, green, and blue are repeatedly formed in the vertical direction. That is, three pixels of red, green, and blue formed in the vertical direction display one color.

Referring to FIG. 2, each pixel includes a first storage electrode 112 branched from a gate line 102 of an adjacent pixel to be parallel to the data line 103 and overlapping the second storage electrode 118. do. Here, the adjacent pixel is a pixel formed in front of the pixel.

Referring to FIG. 3, the first storage electrode 112 is simultaneously formed of the same material when the gate electrode 122 and the gate line 102 of the thin film transistor are formed.

In FIGS. 2 and 3, the first storage electrode 112 is formed of the same material and formed at the same time when the gate electrode 122 and the gate line 102 of the thin film transistor are formed as an example. The first storage electrode 112 is provided separately from the gate electrode 122 and the gate line 102 of the thin film transistor and connected to each other, without departing from the scope of the present invention. An example would be possible.

2, a common voltage line 105 disposed on one side of each pixel is formed on the first substrate 101 to be parallel to the data line 103 and intersect the gate line 102.

The common voltage partial line 106 connected to the common voltage line 105 and the contact hole 119 and overlapping the common voltage line 105 is formed on the first substrate 101.

Each pixel on the first substrate 101 is provided with a common electrode 107 branched from the common voltage partial line 106 to be parallel to the gate line 102.

A portion of the common electrode 107 branched from the common voltage partial line 106 is formed to overlap the gate line 102, and some common electrode 107 overlapping the gate line 102 is formed on both sides of the pixel. A closed loop is formed with the common electrode partial lines 106 arranged. That is, referring to FIG. 2, some of the common electrodes 107 overlapping the gate lines 102 are disposed at the boundary of each pixel to form a closed loop like a mesh shape together with the common voltage partial line 106. The same common voltage can be supplied.

As described above, a part of the common electrode 107 branched from the common voltage partial line 106 is formed to overlap the gate line 102, thereby covering the gate line 102, thereby being transferred through the gate line 102. The influence of the gate signal on the liquid crystal layer is minimized. As a result, the driving of the liquid crystal is distorted by the gate signal transmitted through the gate line 102, thereby preventing the phenomenon that the screen is observed as defective.

Therefore, the area of the black matrix formed on the second substrate (not shown) to overlap with the gate line 102 may be minimized or the black matrix may not be formed.

The pixel having a horizontally long shape as described above includes a common voltage line 105, a common voltage partial line 106, and a common electrode 107 disposed adjacent to the data line 103 in each pixel. The area occupied is minimized and the aperture ratio is improved. Here, the reason why the common voltage line 105, the common voltage partial line 106, and a part of the common electrode 107 are disposed adjacent to the data line 103 in each pixel is transmitted through the data line 103. This is to prevent the phenomenon that the driving of the liquid crystal is distorted by the data signal and observed as a screen defect.

2, a pixel electrode 108 is formed on each pixel on the first substrate 101 so as to cross the common electrode 107 to form a horizontal electric field together with the common electrode 107. As described above, the pixel electrode 108 is connected to the drain electrode 140 of the thin film transistor through the contact hole 109.

In addition, each pixel includes a pixel electrode 108 and a second storage electrode 118 connected to the drain terminal 140 of the thin film transistor and overlapping the first storage electrode 112.

As described above, the second storage electrode 118 overlaps the first storage electrode 112 to form a storage capacitor Cst.

2 and 3, a portion of the pixel electrode 108 connected to the drain terminal 140 of the thin film transistor overlaps the first storage electrode 112 in the second storage electrode 118. In this example, a part of the pixel electrode 108 serves as the second storage electrode 118. However, the present invention is not limited thereto, and the second storage electrode is within the scope of the present invention. 118 may be provided separately from the pixel electrode 108 and connected to each other.

≪ Embodiment 2 >

Hereinafter, a liquid crystal display according to a second exemplary embodiment of the present invention will be described with reference to FIGS. 4 and 5.

4 is a plan view illustrating a liquid crystal display according to a second exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating a plane taken along the line II-II ′ of FIG. 4.

As shown in FIG. 4 and FIG. 5, the liquid crystal display according to the second embodiment of the present invention comprises: a first substrate 201; The gate line 202 and the data line 203 formed longer than the data line 203 are defined by a plurality of pixels crossing the first substrate 201 vertically and horizontally and disposed in each pixel. ; A first storage electrode 212 provided for each pixel and connected to a gate line 202 of an adjacent pixel; A common voltage line 205 formed parallel to the data line 203 and intersecting with the gate line 202; A common voltage partial line 206 connected to the common voltage line 205 and overlapping the common voltage line 205; A common electrode 207 branched into the plurality of common voltage partial lines 206 so as to be parallel to the gate line 202, and a portion of which is overlapped with the gate line 202; A pixel electrode 208 that is alternately formed with the common electrode 207 to form a horizontal electric field together with the common electrode 207; A second storage electrode 218 connected to the pixel electrode 208 and overlapping the first storage electrode 212; .

Each pixel further includes a third storage electrode 217 connected to the common voltage partial line 206 and overlapping the second storage electrode 218.

The liquid crystal display according to the present invention includes a first substrate 201 as a thin film transistor array substrate and a second substrate (not shown) as a color filter substrate, and a liquid crystal layer between the first substrate 201 and the second substrate. (Not shown) is formed.

Referring to FIG. 4, a gate line 202 and a data line 203 are formed on the first substrate 201 so as to intersect longitudinally and horizontally to define a plurality of pixels. Each pixel includes a gate line 202 and a gate line 202. The thin film transistor is formed in an area where the data lines 203 intersect.

Referring to FIG. 5, the thin film transistor may include a gate electrode 222 formed on the first substrate 201, a gate insulating film 250 formed on the gate electrode 222, and the gate on the gate insulating film 250. The semiconductor layer 260 is formed to overlap the electrode 222 and the source electrode 213 and the drain electrode 240 formed on the semiconductor layer 260, and the source electrode 213 and the drain electrode 240 are formed. On the protective layer 270 is further formed.

The gate electrode 222 of the thin film transistor is connected to the gate line 202, the source electrode 213 is connected to the data line 203, and the drain electrode 240 is connected to the pixel through the contact hole 209. It is connected to the electrode 208.

When the direction in which the gate line 202 is formed is referred to as the horizontal direction, each pixel has a long shape in the horizontal direction, and the pixels displaying red, green, and blue are repeatedly formed in the vertical direction. That is, three pixels of red, green, and blue formed in the vertical direction display one color. In particular, each pixel is formed such that the length of the gate line 202 is longer than the length of the data line 203.

Referring to FIG. 4, each pixel is provided with a first storage electrode 212 overlapping the second storage electrode 218 as a partial region of the gate line 202 of an adjacent pixel.

In this case, the gate line 202 serves as a gate line 202 that transfers a gate signal, and overlaps with the second storage electrode 218 of the adjacent pixel, thereby allowing the first storage electrode 212 of the adjacent pixel to overlap. It also plays a role.

The first storage electrode 212 overlaps with the second storage electrode 218 to form a first storage capacitor Cst1.

Here, a detailed description of the second storage electrode 218 will be provided below with a detailed description of the pixel electrode 208.

As shown in FIGS. 4 and 5, the first storage electrode 212 is formed by overlapping a portion of the gate line 202 of the adjacent pixel with the second storage electrode 218 of the pixel. However, the present invention is not limited thereto, and the first storage electrode 212 may be variously provided such that the first storage electrode 212 is provided separately from and connected to the gate line 202 without departing from the scope of the present invention.

Referring to FIG. 4, a common voltage line 205 is formed on one side of each pixel to be parallel to the data line 203 and intersect the gate line 202 on the first substrate 201.

The common voltage partial line 206 is connected to the common voltage line 205 and the contact hole 219 and overlaps the common voltage line 205 on the first substrate 201.

Each pixel on the first substrate 201 is provided with a plurality of common electrodes 207 branched from the common voltage portion line 206 to be parallel to the gate line 203.

A portion of the common electrode 207 branched from the common voltage partial line 206 is formed to overlap with the gate line 202, and some common electrode 207 overlapping with the gate line 202 is formed at both ends of the pixel. A closed loop is formed with the common electrode partial lines 206 arranged. That is, referring to FIG. 4, some of the common electrodes 207 overlapping the gate lines 202 are disposed at the boundary of each pixel to form a closed loop like a mesh shape together with the common voltage partial line 206. The same common voltage can be supplied.

As described above, a part of the common electrode 207 branched from the common voltage partial line 206 is formed to overlap with the gate line 202, thereby covering the gate line 202, thereby being transferred through the gate line 202. The influence of the gate signal on the liquid crystal layer is minimized. Accordingly, the driving of the liquid crystal is distorted by the gate signal transmitted through the gate line 202, thereby preventing the phenomenon that the screen is observed as defective.

Therefore, the area of the black matrix formed on the second substrate (not shown) to overlap with the gate line 202 may be minimized or the black matrix may not be formed.

As described above, the pixel having a horizontally long shape is occupied by the common voltage line 205, the common voltage partial line 206, and the common electrode 207 disposed adjacent to the data line 203 in each pixel. The area is minimized to improve the aperture ratio.

The reason why the common voltage line 205, the common voltage partial line 206, and a part of the common electrode 207 are disposed adjacent to the data line 203 in each pixel is transmitted through the data line 203. This is to prevent the phenomenon that the driving of the liquid crystal is distorted by the data signal to be observed as a screen defect.

4, a pixel electrode 208 is formed on each pixel on the first substrate 201 so as to cross the common electrode 207 to form a horizontal electric field together with the common electrode 207. As mentioned above, the pixel electrode 208 is connected to the drain electrode 240 of the thin film transistor.

Each pixel includes a second storage electrode 218 connected to the pixel electrode 208 and the drain electrode 240 of the thin film transistor to overlap the first storage electrode 212 and the third storage electrode 217. do.

Referring to FIG. 5, the second storage electrode 218 is formed of the same material on the same layer when the source electrode 213 and the drain electrode 240 of the thin film transistor are formed. The third electrode is connected to the pixel electrode 208 through 229, and overlaps the first storage electrode 212 with a gate insulating layer 250 interposed therebetween, and a third passivation layer 270 interposed therebetween. It overlaps with the storage electrode 217.

That is, the second storage electrode 218 overlaps with the first storage electrode 212 to form the first storage capacitor Cst1, and overlaps with the third storage electrode 217 to overlap the second storage capacitor Cst2. To form.

Hereinafter, the third storage electrode 217 will be described in detail with reference to FIGS. 4 and 5.

The third storage electrode 217 formed on the first substrate 101 is formed of the same material on the same layer so as to be connected to the common voltage partial line 206 when the common voltage partial line 206 is formed. As mentioned above, the second storage electrode C218 is overlapped with the second storage electrode 218 with the passivation layer 270 therebetween to form the second storage capacitor Cst2.

As shown in FIG. 4, the third storage electrode 217 is formed by forming a portion of the common electrode 207 connected to the common voltage partial line 206 to overlap the second storage electrode 218. For example, the present invention is not limited thereto. For example, the third storage electrode 217 may be provided separately from and connected to the common voltage partial line 206.

Accordingly, the liquid crystal display according to the second exemplary embodiment of the present invention may include a first storage capacitor Cst1 in which the first storage electrode 212 and the second storage electrode 218 are formed with the gate insulating layer 250 interposed therebetween. Since the second storage capacitor Cst2, in which the second storage electrode 218 and the third storage electrode 217 are formed with the passivation layer 207 therebetween, is provided with a double storage capacitor, a storage capacitor provided in each pixel. Since the area of the liquid crystal display device can be minimized, the aperture ratio of the liquid crystal display device can be maximized.

≪ Third Embodiment >

Hereinafter, a liquid crystal display according to a third exemplary embodiment of the present invention will be described with reference to FIGS. 6 and 7.

In the description of the liquid crystal display according to the third embodiment of the present invention, the same description as those of the first and second embodiments will be omitted.

FIG. 6 is a plan view illustrating a liquid crystal display according to a third exemplary embodiment of the present invention, and FIG. 7 is a plan view illustrating another arrangement example of a pixel electrode and a common electrode in the liquid crystal display of FIG. 6.

As shown in FIG. 6, the liquid crystal display according to the third embodiment of the present invention includes: a first substrate 301; The gate line 302 and the data line 303 formed longer than the data line 303 may be formed on the first substrate 301 by crossing horizontally and horizontally to define a plurality of pixels, and the gate line 302 disposed in each pixel. ; A common voltage line 305 parallel to the data line 303 and formed to cross the gate line 302; A plurality of common electrodes 307 formed in connection with the common voltage line 305; A pixel electrode 308 that is alternately formed with the common electrode 307 to form a horizontal electric field together with the common electrode 307; A storage electrode 318 connected to the pixel electrode 308 and overlapping a portion of the common voltage line 305; .

Referring to FIG. 6, a gate line 302 and a data line 303 are formed on the first substrate 301 so as to intersect longitudinally and horizontally to define a plurality of pixels, and each pixel includes a gate line 302 and data. The thin film transistor is formed in an area where the lines 303 intersect.

When the direction in which the gate line 302 is formed on the first substrate 301 is referred to as the horizontal direction, each pixel has a long shape in the horizontal direction, and pixels displaying red, green, and blue are repeatedly formed in the vertical direction. . That is, three pixels of red, green, and blue formed in the vertical direction display one color.

Referring to FIG. 6, a common voltage line 305 is formed on one side of the pixel to be parallel to the data line 303 and intersect the gate line 302 on the first substrate 301.

The common voltage partial line 306 is formed on the first substrate 301 through the common voltage line 305 and the contact hole 319 and is disposed at the edge of the pixel. The common voltage partial line 306 is a means for connecting the common voltage line 305 and the common electrode 307, but a region formed in parallel with the pixel electrode 308 simultaneously serves as the common electrode 307. In charge.

Each pixel on the first substrate 301 is provided with a common electrode 307 branched from the common voltage partial line 306 to be parallel to the gate line 302.

In FIG. 6, the common electrode 307 is formed in parallel with the gate line 302, but the present invention is not limited thereto. As illustrated in FIG. 7, the common electrode 407 may include a data line 403. Various examples are possible within the range which does not deviate from the summary of this invention, such as being formed in parallel with).

As described above, the pixel having a horizontally long shape is occupied by the common voltage line 305, the common voltage partial line 306, and the common electrode 307 disposed adjacent to the data line 303 in each pixel. The area is minimized to improve the aperture ratio.

The reason why the common voltage line 305, the common voltage partial line 306, and the common electrode 307 are disposed adjacent to the data line 303 in each pixel is transmitted through the data line 303. This is to prevent the phenomenon that the driving of the liquid crystal is distorted by the data signal to be observed as a screen defect.

Referring to FIG. 6, a pixel electrode 308 is formed in each pixel on the first substrate 301 so as to cross the common electrode 307 to form a horizontal electric field together with the common electrode 307. The pixel electrode 308 is connected to the drain terminal 340 of the thin film transistor provided in each pixel through the contact hole 309.

Each pixel on the first substrate 301 is provided with a storage electrode 318 connected to the pixel electrode 308 and overlapping a part of the common voltage line 305 to form a storage capacitor Cst.

As illustrated in FIG. 6, the storage electrode 318 is formed by overlapping a portion of the pixel electrode 308 with a portion of the common voltage line 305, but the present invention is limited thereto. The storage electrode 318 may be provided separately from the pixel electrode 308 and connected to the pixel electrode 308 without departing from the scope of the present invention.

In FIG. 6, the pixel electrode 308 is formed in parallel with the gate line 302, but the present invention is not limited thereto. As illustrated in FIG. 7, the pixel electrode 408 may be a common electrode ( Various examples are possible without departing from the gist of the present invention, such as being formed in parallel with the data line 403 together with the 407.

<Fourth Embodiment>

Hereinafter, a liquid crystal display according to a fourth exemplary embodiment of the present invention will be described with reference to FIGS. 8 and 9.

In the description of the liquid crystal display according to the fourth embodiment of the present invention, the same descriptions as those of the first to third embodiments will be omitted.

FIG. 8 is a plan view illustrating a liquid crystal display according to a fourth exemplary embodiment of the present invention, and FIG. 9 is a plan view illustrating another arrangement example of a pixel electrode and a common electrode in the liquid crystal display of FIG. 8.

As shown in FIG. 8, the liquid crystal display according to the fourth embodiment of the present invention includes a first substrate 501; The gate lines 502 and the data lines 503 formed longer than the data lines 503 are formed on the first substrate 501 by crossing horizontally and horizontally to define a plurality of pixels, and the gate lines 502 disposed in each pixel. ; A common voltage line 505 parallel to the data line 503 and formed to cross the gate line 502; A plurality of common electrodes 507 formed in connection with the common voltage line 505; A pixel electrode 508 alternately formed with the common electrode 507 to form a horizontal electric field together with the common electrode 507; A storage electrode 518 connected to the pixel electrode 508 and overlapping a portion of the common voltage line 505; .

The common voltage line 505 is formed in parallel with the data line 503 near the center of each pixel.

Referring to FIG. 8, a gate line 502 and a data line 503 are formed on the first substrate 501 so as to intersect longitudinally and horizontally to define a plurality of pixels. Each pixel includes a gate line 502 and a gate line 502. The thin film transistor is formed in an area where the data lines 503 intersect.

When the direction in which the gate line 502 is formed on the first substrate 501 is referred to as a horizontal direction, each pixel has a long shape in the horizontal direction, and pixels displaying red, green, and blue are repeatedly formed in the vertical direction. . That is, three pixels of red, green, and blue formed in the vertical direction display one color.

Referring to FIG. 8, a common voltage line 505 is formed on the first substrate 501 at the center of the pixel to be parallel to the data line 503 and intersect the gate line 502.

A common voltage partial line 506 is formed on the first substrate 501 to be connected to the common voltage line 505 through a contact hole 519 and disposed at an edge of the pixel. Here, the common voltage partial line 506 is a means for connecting the common voltage line 505 and the common electrode 507, but a region formed in parallel with the pixel electrode 508 serves as the common electrode 507 at the same time. .

Each pixel on the first substrate 501 is formed with a common electrode 507 branched from the common voltage partial line 506 to be parallel to the gate line 502. That is, referring to FIG. 8, the common electrode 507 formed in each pixel is formed to extend in both directions from the common voltage partial line 506.

Although the common electrode 507 is formed in parallel with the gate line 502 in FIG. 8 as an example, the present invention is not limited thereto. As shown in FIG. 9, the common electrode 607 includes a data line. Various examples are possible without departing from the gist of the present invention, such as being formed in parallel with 603.

As described above, the pixel having a horizontally long shape is occupied by the common voltage line 505, the common voltage partial line 506, and the common electrode 507 disposed adjacent to the data line 503 in each pixel. The area is minimized to improve the aperture ratio.

The reason why the common voltage line 505, the common voltage partial line 506, and a part of the common electrode 507 are disposed adjacent to the data line 503 in each pixel is transmitted through the data line 503. This is to prevent the phenomenon that the driving of the liquid crystal is distorted by the data signal and observed as a defective screen.

As described above, when the common voltage line 505 is formed to be parallel to the data line 503 at the center of the pixel, the common voltage line 505 and the data line (which are formed on the same layer and made of the same material in the manufacturing process) Since a sufficient distance between the 503 is secured, the common voltage line 505 and the data line 503 are shorted during the manufacturing process, thereby minimizing the occurrence of defects.

Referring to FIG. 8, a pixel electrode 508 is formed in each pixel on the first substrate 501 so as to cross the common electrode 507 to form a horizontal electric field together with the common electrode 507. The pixel electrode 508 is connected to the drain terminal 540 of the thin film transistor provided in each pixel through the contact hole 509.

Each pixel on the first substrate 501 is provided with a storage electrode 518 connected to the pixel electrode 508 and overlapping a portion of the common voltage line 505 to form a storage capacitor Cst.

As illustrated in FIG. 8, the storage electrode 518 is formed by overlapping a portion of the pixel electrode 508 with a portion of the common voltage line 505, but the present invention is limited thereto. The storage electrode 518 may be provided separately from the pixel electrode 508 and connected to the pixel electrode 508 without departing from the spirit of the present invention.

8 illustrates a case in which the pixel electrode 508 is formed parallel to the gate line 502, the present invention is not limited thereto. As illustrated in FIG. 9, the pixel electrode 608 may be a common electrode. Various examples are possible without departing from the gist of the present invention, such as being formed parallel to the data line 603 together with the 607.

1 is a plan view showing a conventional general liquid crystal display device.

2 is a plan view showing a liquid crystal display device according to a first embodiment of the present invention.

3 is a cross-sectional view illustrating a plane taken along line II ′ of FIG. 2.

4 is a plan view showing a liquid crystal display device according to a second preferred embodiment of the present invention.

5 is a cross-sectional view illustrating a plane taken along the line II-II ′ of FIG. 4.

6 is a plan view showing a liquid crystal display device according to a third preferred embodiment of the present invention.

7 is a plan view illustrating another arrangement example of a pixel electrode and a common electrode in the liquid crystal display of FIG. 6.

8 is a plan view showing a liquid crystal display device according to a fourth preferred embodiment of the present invention.

9 is a plan view illustrating another arrangement example of a pixel electrode and a common electrode in the liquid crystal display of FIG. 8;

DESCRIPTION OF REFERENCE NUMERALS

102,202,302,502: gate lines 103,203,303,403,503,603: data lines

105,205,305,505: Common voltage line 107,207,307,407,507,607: Common electrode

108,208,308,408,508,608: pixel electrode 112,212: first storage electrode

118,218: second storage electrode 217: third storage electrode

318,518: storage electrode

Claims (11)

A first substrate; A gate line and a data line intersecting longitudinally and horizontally on the first substrate to define a plurality of pixels, and the gate line disposed in each pixel being longer than the data line; A first storage electrode provided for each pixel and connected to a gate line of an adjacent pixel; A common voltage line parallel to the data line and intersecting the gate line; A common voltage partial line connected to the common voltage line and overlapping the common voltage line; A plurality of common electrodes branched from the common voltage partial line to be parallel to the gate line, a part of the common electrode overlapping the gate line; A pixel electrode formed to cross the common electrode to form a horizontal electric field together with the common electrode; And A second storage electrode connected to the pixel electrode and overlapping the first storage electrode; And the liquid crystal display device. The liquid crystal display of claim 1, wherein the common voltage partial line and the common electrode connected to each other are formed at a boundary of each pixel to form a closed loop of a net shape. The liquid crystal display of claim 1, wherein the first storage electrode is branched from an adjacent gate line and disposed in each pixel, and is formed to be parallel to and adjacent to the data line. The liquid crystal display of claim 1, wherein the second storage electrode is adjacent to and parallel to the data line. The liquid crystal display of claim 1, wherein the second storage electrode is adjacent to and parallel to the gate line. The liquid crystal display of claim 1, wherein each pixel further includes a third storage electrode connected to the common voltage partial line and overlapping the second storage electrode. A first substrate; A gate line and a data line intersecting longitudinally and horizontally on the first substrate to define a plurality of pixels, and the gate line disposed in each pixel being longer than the data line; A common voltage line parallel to the data line and formed to cross the gate line; A plurality of common electrodes formed in connection with the common voltage line; A pixel electrode formed to cross the common electrode to form a horizontal electric field together with the common electrode; A storage electrode connected to the pixel electrode and overlapping a portion of the common voltage line; And the liquid crystal display device. The method of claim 7, wherein the common electrode and the common voltage line is connected by a common voltage partial line, And the common electrode is formed parallel to the gate line. The method of claim 7, wherein the common electrode and the common voltage line is connected by a common voltage partial line, And the common electrode is formed parallel to the data line. The method of claim 7, wherein the common voltage line is formed in parallel with the data line near the center of each pixel, And the common electrode and the common voltage line are connected by a common voltage partial line. The liquid crystal display of claim 10, wherein the common electrode formed in each pixel is formed in a branch shape extending in both directions from a common voltage partial line.

Images