KR20130071928A - Fringe field switching liquid crystal display device - Google Patents

Abstract

PURPOSE: A fringe field type liquid crystal display device is provided to reduce a viewing angle asymmetry by improving transmittance. CONSTITUTION: A TFT (Thin Film Transistor) (Ta,Tb,Tc,Td) is formed in a cross domain of a gate line (216n-1,216n,216n+1) and a data line (217m-1,217m,217m+1). A common electrode (208) having a pixel electrode (218a,218b,218c,218d) and a plurality of slits (208sa,208sb,208sc,208sd) generates a fringe field. Two pixels are comprised as a pair. Two domains with the two pixels are comprised by inclining a reference data line which is arranged in the center of the pixels.

Description

Fringe field type liquid crystal display device {FRINGE FIELD SWITCHING LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a fringe field type liquid crystal display device, and more particularly, to a fringe field type liquid crystal display device capable of realizing a high resolution and a wide viewing angle.

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 figure, a general liquid crystal display device is largely a color filter substrate 5 and an array substrate 10 and a liquid crystal layer (liquid crystal layer) 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 for implementing colors of red (R), green (G), and blue (B); A black matrix (BM) 6 that separates the sub-color filters 7 and blocks light passing through the liquid crystal layer 30, and a transparent common that applies a voltage to the liquid crystal layer 30. It consists of an electrode 8.

In addition, the array substrate 10 is vertically and horizontally arranged to cross a plurality of gate lines 16 and data lines 17, which define a plurality of pixels P, and the gate lines 16 and data lines 17. A thin film transistor T, which is a switching element formed in a region, and a pixel electrode 18 formed on the pixel P are formed.

The color filter substrate 5 and the array substrate 10 configured as described above are joined to face each other by sealants (not shown) formed on the outer side of the image display area to form a liquid crystal panel, and the color filter substrate 5 ) And the array substrate 10 are bonded through a bonding key (not shown) formed on the color filter substrate 5 or the array substrate 10.

At this time, the driving method generally used in the liquid crystal display device is a twisted nematic (TN) method for driving the nematic liquid crystal molecules in a vertical direction with respect to the substrate, but the liquid crystal display device of the twisted nematic method Has the disadvantage that the viewing angle is as narrow as 90 degrees. This is due to the refractive anisotropy of the liquid crystal molecules because the liquid crystal molecules oriented horizontally with the substrate are oriented almost perpendicular to the substrate when a voltage is applied to the liquid crystal panel.

Accordingly, there is an In Plane Switching (IPS) type liquid crystal display device in which a liquid crystal molecule is driven in a horizontal direction with respect to a substrate to improve the viewing angle to 170 degrees or more.

FIG. 2 is a cross-sectional view schematically illustrating a portion of an array substrate in a fringe field switching (FFS) liquid crystal display device having a general 1 pixel 1 domain structure. FIG. 2 is a cross-sectional view of an array substrate including two pixels. Some are shown as an example.

In the fringe field type liquid crystal display device, an electric field is generated in the horizontal and vertical directions as a pixel electrode is formed at a lower side of the liquid crystal molecules in a horizontal orientation and a common electrode having a plurality of slits is formed at the top. The liquid crystal molecules are twisted and tilted to be driven.

In this case, the one pixel and one domain structure refers to a structure in which one domain is formed in one pixel.

As shown in the figure, an array substrate 10 of a fringe field type liquid crystal display device having a one pixel and one domain structure has a gate line 16 and a data line arranged vertically and horizontally on the transparent array substrate 10 to define pixels. A thin film transistor T, which is a switching element, is formed in an intersection region of the gate line 16 and the data line 17.

The thin film transistor T includes a gate electrode 21 connected to the gate line 16, a source electrode 22 connected to the data line 17, and a drain electrode 23 connected to the pixel electrode 18. . In addition, the thin film transistor T is formed by a gate insulating film (not shown) for insulation between the gate electrode 21 and the source / drain electrodes 22 and 23 and a gate voltage supplied to the gate electrode 21. An active layer (not shown) forms a conductive channel between the source electrode 22 and the drain electrode 23.

The common electrode 8 and the pixel electrode 18 are formed in the pixel, and the common electrode 8 is formed together with the pixel electrode 18 having a quadrangular shape to generate a fringe field. ), A plurality of slits 8s are included.

Since the fringe field type liquid crystal display device configured as described above has a one-pixel one-domain structure in which one domain is formed in one pixel P ₁ and P ₂ , viewing angle asymmetry occurs in a specific pattern. That is, in the one-pixel one-domain structure, the domain is generated in one direction, so that the viewing angle asymmetry occurs along the left and right views.

In order to improve this, a fringe field type liquid crystal display device having a one-pixel two-domain structure in which two domains are formed in one pixel is introduced, which will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view schematically showing a part of an array substrate in a fringe field type liquid crystal display device having a general one-pixel two-domain structure, for example, showing a part of an array substrate including two pixels.

In this case, the fringe field type liquid crystal display device having a one pixel and two domain structure is substantially the same as the fringe field type liquid crystal display device having a one pixel and one domain structure except that two electrodes are formed in one pixel by bending an electrode in the middle of the pixel. Consists of the same configuration.

As shown in the figure, the array substrate 10 'of a fringe field type liquid crystal display having a one-pixel two-domain structure has a gate line 16' arranged vertically and horizontally on the transparent array substrate 10 'to define pixels. And a data line 17 ', and a thin film transistor T', which is a switching element, is formed at an intersection of the gate line 16 'and the data line 17'.

The thin film transistor T 'includes a gate electrode 21' connected to the gate line 16 ', a source electrode 22' connected to the data line 17 ', and a drain electrode connected to the pixel electrode 18'. 23 '. In addition, the thin film transistor T 'is supplied to a gate insulating film (not shown) and the gate electrode 21' for insulation between the gate electrode 21 'and the source / drain electrodes 22' and 23 '. An active layer (not shown) forms a conductive channel between the source electrode 22 'and the drain electrode 23' by the gate voltage.

The common electrode 8 'and the pixel electrode 18' are formed in the pixel, and the common electrode 8 'is formed together with the pixel electrode 18' having a rectangular shape to generate a fringe field. A plurality of slits 8s 'are included in the common electrode 8'.

In the fringe field type liquid crystal display device configured as described above, one pixel P1 is formed by the common electrode 8 'including the plurality of slits 8s' and the data line 17' being bent at the center C of the pixel. Since two domains are formed in the ', P2'), the left and right viewing angle asymmetry does not occur, but the liquid crystal does not drive properly in the center C of the pixel where the common electrode 8 'and the data line 17' are bent. Not in the foreground (disclination) is generated and the transmittance is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide a fringe field type liquid crystal display device which improves transmittance and improves viewing angle asymmetry.

Other objects and features of the present invention will be described in the configuration and claims of the invention which will be described later.

In order to achieve the above object, a fringe field type liquid crystal display device of the present invention comprises a plurality of gate lines and data lines arranged vertically and horizontally on an array substrate to define pixels; A thin film transistor formed at an intersection of the gate line and the data line; And a common electrode having a plurality of slits and a pixel electrode formed in the pixel to generate a fringe field, comprising two pixels in pairs, and arranged in the middle of the pair of pixels. The line (hereinafter, referred to as a reference data line) is formed to be inclined differently from data lines positioned to the left and right of the reference data line, thereby forming two domains in two pixels.

In this case, each of the pair of pixels has a trapezoidal shape, and the pixels are gathered together to form a square or a rectangle.

In this case, the thin film transistor may be configured in a narrow portion or a wide portion in the trapezoidal pixel.

The pixel electrode may be configured in a trapezoidal shape in each pixel.

In this case, the pair of pixel electrodes formed on the pair of pixels may be gathered together to form a square or a rectangle.

The common electrode is formed in a single pattern over the entire pixel portion in which an image is displayed, and has a plurality of slits in each pixel.

In this case, the common electrode between the slits in each pixel may have a finger shape.

In this case, the finger-shaped common electrode including the plurality of slits may be inclined to correspond to the inclination angle of the reference data line.

Data lines positioned to the left and right of the reference data line may be arranged substantially perpendicular to the gate line.

The reference data line is bent near the gate line between the upper pair of pixels and the lower pair of pixels to incline in different directions between the upper pair of pixels and the lower pair of pixels. It is characterized by losing.

In this case, the upper pair of pixels and the lower pair of pixels gather together to form pixels of A block or pixels of B block, and pixels of A block and pixels of B block are alternately arranged. It is characterized by.

In this case, the reference data line is inclined in different directions of the pixels of the A block and the pixels of the B block, and a common electrode having a finger shape including the plurality of slits is inclined in different directions. do.

At this time, the pixels of the A block and the pixels of the B block are characterized in that the thin film transistor is configured at different positions.

As described above, the fringe field type liquid crystal display device according to the present invention forms a pair of two pixels and forms a 2 pixel 2 domain structure in which the common electrode is bent around the gate line. It improves the transmittance and at the same time provides the effect of improving the viewing angle asymmetry.

1 is an exploded perspective view schematically showing a structure of a general liquid crystal display device.
Fig. 2 is a plan view schematically showing a part of an array substrate in a fringe field type liquid crystal display device having a general one pixel and one domain structure.
3 is a plan view schematically showing a part of an array substrate in a fringe field type liquid crystal display device having a general one-pixel two-domain structure.
4 is a plan view schematically showing a part of an array substrate in a fringe field type liquid crystal display device having a two-pixel two-domain structure according to an embodiment of the present invention.
5 is a plan view schematically showing another part of an array substrate in a fringe field type liquid crystal display device having a two-pixel two-domain structure according to an embodiment of the present invention.
FIG. 6 is an exemplary view illustrating arrangement of pixels in a fringe field type liquid crystal display device having a two-pixel two-domain structure according to an embodiment of the present invention. FIG.
FIG. 7 is an exemplary diagram showing, for example, pixels of an A block in the arrangement of the pixels shown in FIG. 6; FIG.
FIG. 8 is an exemplary diagram showing, for example, pixels of a B block in the arrangement of the pixels shown in FIG. 6; FIG.

Hereinafter, exemplary embodiments of the fringe field type liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a plan view schematically illustrating a portion of an array substrate in a fringe field type liquid crystal display device having a two-pixel two-domain structure according to an exemplary embodiment of the present invention.

At this time, in the actual liquid crystal display device, the N gate lines and the M data lines cross each other, and there are M × N pixels. However, for the sake of simplicity, two pixels are illustrated in the drawing.

As shown in the figure, in the array substrate 110 according to an embodiment of the present invention, the gate lines 116n-1 and 116n and the data lines 117m− which are arranged vertically and horizontally on the array substrate 110 to define pixels. 1, 117m) is formed. In addition, thin film transistors Ta and Tb, which are switching elements, are formed in an intersection area between the gate lines 116n-1 and 116n and the data lines 117m-1 and 117m, and a fringe field is generated in the pixel. A common electrode 108 having pixel electrodes 118a and 118b for driving liquid crystal molecules and a plurality of slits 108sa and 108sb is formed.

In this case, the fringe field type liquid crystal display device having the two-pixel two-domain structure according to the embodiment of the present invention configures two pixels Pa and Pb in pairs, and each of the two pixels Pa and Pb. Has a substantially trapezoidal shape, and these (Pa, Pb) are gathered together to form a square such as a square or a rectangle.

Each of the pixels Pa and Pb includes a first thin film transistor Ta and a second thin film transistor Tb. In this case, the first thin film transistor Ta and the second thin film transistor Tb may be formed in a narrow portion or a wide portion in the trapezoidal pixels Pa and Pb in order to maximize the aperture ratio.

The first thin film transistor Ta includes a first gate electrode 121a connected to the nth gate line 116n, a first source electrode 122a connected to the m−1th data line 117m-1, and a first The first drain electrode 123a is electrically connected to the one pixel electrode 118a. In addition, the first thin film transistor Ta may include a gate insulating film (not shown) and the first gate electrode 121a for insulation between the first gate electrode 121a and the first source / drain electrodes 122a and 123a. A first active layer (not shown) for forming a conductive channel between the first source electrode 122a and the first drain electrode 123a by the gate voltage supplied to the ().

The second thin film transistor Tb includes a second gate electrode 121b connected to the n−1 th gate line 116n−1, a second source electrode 122b connected to the m th data line 117m, and a second The second drain electrode 123b is electrically connected to the two pixel electrodes 118b. In addition, the second thin film transistor Tb is supplied to the gate insulating layer and the second gate electrode 121b for insulation between the second gate electrode 121b and the second source / drain electrodes 122b and 123b. The second active layer (not shown) forms a conductive channel between the second source electrode 122b and the second drain electrode 123b by the gate voltage.

The common electrode 108 and the pixel electrodes 118a and 118b are formed in the pixel to generate a fringe field, wherein the pixel electrodes 118a and 118b are formed in a substantially trapezoidal shape in each pixel. It may be divided into an electrode 118a and a second pixel electrode 118b. The first pixel electrode 118a and the second pixel electrode 118b may be gathered together to form a square, such as a square or a rectangle.

The common electrode 108 may be formed in a single pattern over the entire pixel portion, and may have a plurality of first slits 108sa and second slits 108sb in each pixel. The common electrode 108 between each of the plurality of first slits 108sa and the second slits 108sb may have a finger shape.

As described above, a fringe field type liquid crystal display device having a two-pixel two-domain structure in which two pixels Pa and Pb form a pair is arranged in the middle of the two pixels Pa and Pb. The data line 117m-1 (hereinafter referred to as a reference data line) is divided into a first pixel Pa and a second pixel Pb.

The reference data line 117m-1 is formed to be inclined at a predetermined angle, and the common electrode 108 having a finger shape including the plurality of first slits 108sa and second slits 108sb corresponding to the angles. This will tilt.

In this case, the data lines 117m-2 and 117m positioned on the left and right sides of the inclined reference data line 117m-1 are formed to be substantially perpendicular to the gate lines 116n-1 and 116n. do.

As described above, the reference data line 117m-1 is formed to be inclined between the first pixel Pa and the second pixel Pb, that is, the pair of pixels Pa and Pb. Two domains are formed in (Pa, Pb). According to the inclination angle of the reference data line 117m-1, the domain between the first pixel Pa and the second pixel Pb can be compensated for, so that left and right viewing angle asymmetry does not occur.

In the fringe field type liquid crystal display device configured as described above, instead of placing the region where the common electrode and the reference data line are bent in a pixel, the fringe field type liquid crystal display device is positioned in the gate line region between upper and lower pixels, thereby reducing transmittance due to the foreground line. This can be prevented, which will be described in detail with reference to the following drawings.

5 is a plan view schematically illustrating another part of an array substrate in a fringe field type liquid crystal display device having a two-pixel two-domain structure according to an embodiment of the present invention.

At this time, in the actual liquid crystal display device, N gate lines and M data lines cross each other, and there are M × N pixels. However, for the sake of simplicity, four pixels are illustrated in the drawing. That is, the pair of pixels described above represents a part of the array substrate which is configured as four pixels by forming the upper and lower parts.

As shown in the figure, the array substrate 210 according to an embodiment of the present invention and the gate line (216n-1, 216n, 216n + 1) and data arranged vertically and horizontally on the array substrate 210 to define a pixel Lines 217m-1, 217m, 217m + 1 are formed. Further, thin film transistors Ta, Tb, Tc, and Td, which are switching elements, are formed in an intersection region of the gate lines 216n-1, 216n, 216n + 1 and the data lines 217m-1, 217m, 217m + 1. In the pixel, pixel electrodes 218a, 218b, 218c, and 218d for generating a fringe field to drive liquid crystal molecules and a common electrode 208 having a plurality of slits 208sa, 208sb, 208sc, and 208sd are formed. It is.

In this case, the fringe field type liquid crystal display device having the two-pixel two-domain structure according to the exemplary embodiment of the present invention configures two pixels Pa, Pb, Pc, and Pd in pairs. That is, the upper two pixels Pa and Pb are paired, and the lower two pixels Pc and Pd are paired. In this case, each of the upper two pixels Pa and Pb has a substantially trapezoidal shape, and they are gathered together to form a square such as a square or a rectangle, and each of the two lower pixels Pc and Pd is approximately It has a trapezoidal shape and they are gathered together to form a square such as a square or a rectangle.

Each of the pixels Pa, Pb, Pc, and Pd includes a first thin film transistor Ta, a second thin film transistor Tb, a third thin film transistor Tc, and a fourth thin film transistor Td. . In this case, the first thin film transistor Ta, the second thin film transistor Tb, the third thin film transistor Tc, and the fourth thin film transistor Td each have the trapezoidal pixel Pa, Pb, It is characterized in that it is formed in a narrow portion or a wide portion in the Pc, Pd).

The first thin film transistor Ta includes a first gate electrode 221a connected to the n-th gate line 216n, a first source electrode 222a connected to the m-th data line 217m-1, and a first thin film transistor Ta. The first drain electrode 223a is electrically connected to the one pixel electrode 218a. In addition, the first thin film transistor Ta may include a gate insulating film (not shown) and the first gate electrode 221a for insulation between the first gate electrode 221a and the first source / drain electrodes 222a and 223a. A first active layer (not shown) for forming a conductive channel between the first source electrode 222a and the first drain electrode 223a by a gate voltage supplied to the second electrode.

The second thin film transistor Tb includes a second gate electrode 221b connected to the n-th gate line 216n, a second source electrode 222b and a second pixel electrode connected to the m-th data line 217m. And a second drain electrode 223b electrically connected to 218b. In addition, the second thin film transistor Tb is supplied to the gate insulating layer and the second gate electrode 221b for insulation between the second gate electrode 221b and the second source / drain electrodes 222b and 223b. A second active layer (not shown) forms a conductive channel between the second source electrode 222b and the second drain electrode 223b by the gate voltage.

The third thin film transistor Tc includes a third gate electrode 221c connected to the n + 1th gate line 216n + 1, a third source electrode 222c connected to the mth data line 217m, and a third The third drain electrode 223c is electrically connected to the three pixel electrodes 218c. In addition, the third thin film transistor Tc may include a gate insulating film (not shown) and the third gate electrode 221c for insulation between the third gate electrode 221c and the third source / drain electrodes 222c and 223c. A third active layer (not shown) which forms a conductive channel between the third source electrode 222c and the third drain electrode 223c by a gate voltage supplied to the circuit.

The fourth thin film transistor Td includes a fourth gate electrode 221d connected to the nth gate line 216n, a fourth source electrode 222d connected to the m + 1th data line 217m + 1, and a fourth The fourth drain electrode 223d is electrically connected to the four pixel electrodes 218d. In addition, the fourth thin film transistor Td is supplied to the gate insulating layer and the fourth gate electrode 221d for insulation between the fourth gate electrode 221d and the fourth source / drain electrodes 222d and 223d. And a fourth active layer (not shown) forming a conductive channel between the fourth source electrode 222d and the fourth drain electrode 223d by the gate voltage.

The common electrode 208 and the pixel electrodes 218a, 218b, 218c, and 218d are formed in the pixel to generate a fringe field, wherein the pixel electrodes 218a, 218b, 218c, and 218d are roughly formed in each pixel. The first pixel electrode 218a, the second pixel electrode 218b, the third pixel electrode 218c, and the fourth pixel electrode 218d formed in a trapezoidal shape may be divided. The first pixel electrode 218a and the second pixel electrode 218b are gathered together to form a square, such as a square or a rectangle, and the third pixel electrode 218c and the fourth pixel electrode 218d are gathered together to form an approximately square shape. To form a square, such as square or rectangle.

The common electrode 208 is formed in a single pattern over the entire pixel portion, while each of the plurality of first slits 208sa, the second slits 208sb, the third slits 208sc, and the third slits in each pixel. It may be formed to have four slits 208sd. The common electrode 208 between each of the plurality of first slits 208sa, the second slits 208sb, the third slits 208sc, and the fourth slits 208sd may have a finger shape.

As described above, the fringe field type liquid crystal of the two-pixel two-domain structure according to the embodiment of the present invention in which the upper two pixels Pa and Pb and the lower two pixels Pc and Pd each constitute a pair. The display device includes a first pixel Pa and a first pixel by a data line 217m (hereinafter referred to as a reference data line) arranged at the middle of the left and right sides of the upper and lower pixels Pa, Pb, Pc, and Pd. It is divided into two pixels Pb and is divided into a third pixel Pc and a fourth pixel Pd.

The reference data line 217m is formed to be inclined at an angle, and the plurality of first slits 208sa, second slits 208sb, third slits 208sc, and fourth slits 208sd correspond to the angles. The common electrode 208 in the form of a finger including) is tilted.

In this case, the data lines 217m-1 and 217m + 1 positioned to the left and right of the inclined reference data line 217m are formed substantially perpendicular to the gate lines 216n-1, 216n and 216n + 1. It is characterized by being.

As described above, the reference data line 217m is inclined between the first pixel Pa and the second pixel Pb, that is, the upper pair of pixels Pa and Pb. Two domains are formed in the pixels Pa and Pb. In addition, the reference data line 217m is formed to be inclined between the third pixel Pc and the fourth pixel Pd, that is, the lower pair of pixels Pc and Pd, so that the pair of the upper part is inclined. Two domains are formed in the pixels Pc and Pd.

The domains between the first pixel Pa, the second pixel Pc, the third pixel Pc, and the fourth pixel Pd may be compensated for according to the inclination angle of the reference data line 217m. Therefore, left and right viewing angle asymmetry does not occur.

The fringe field type liquid crystal display device configured as described above has a gate line arranged at an upper and lower middle of the upper and lower pixels Pa, Pb, Pc, and Pd in an area where the common electrode 208 and the reference data line 217m are bent. By placing it near 216n, there is no portion of reduced transmittance due to the foreground line. For example, in the two-pixel two-domain structure, the aperture ratio and the transmittance were 51.1% and 17.15%, respectively, and the transmittance was improved to about 102.8% compared to the existing structure (one pixel and one domain structure).

On the other hand, the pixels of the two-pixel two-domain structure can be arranged so that the viewing angle asymmetry does not occur in a specific pattern, which will be described in detail with reference to the following drawings.

6 is an exemplary view illustrating arrangement of pixels in a fringe field type liquid crystal display device having a two-pixel two-domain structure according to an embodiment of the present invention.

6 illustrates a pixel in which a viewing angle asymmetry does not occur in a white, black, gray, or mosaic pattern, and a viewing angle asymmetry does not occur in a horizontal line or a vertical line pattern. The arrangement of these is shown as an example.

6 illustrates an arrangement of pixels when viewing angle asymmetry does not occur in a red (R), green (G), or blue (B) color pattern, and viewing angle asymmetry does not occur in a 1-dot or 2-dot pattern. For example.

6 illustrates an arrangement of pixels when viewing angle asymmetry does not occur in a horizontal 4-pixel periodic pattern or a horizontal 2-pixel inversion pattern.

The arrangement of the pixels of FIG. 6 may have a structure in which two blocks, that is, pixels of the A block and pixels of the B block are alternately arranged, wherein the pixels of the A block and the pixels of the B block are arranged. They are rewarded with each other.

FIG. 7 is an exemplary diagram illustrating pixels of an A block in the arrangement of pixels illustrated in FIG. 6, and FIG. 8 is an example diagram of pixels of a B block in the arrangement of pixels illustrated in FIG. 6. It is an exemplary figure to show, and to show.

Referring to the drawings, the pixels P of each block are paired with two pixels P on the top and a pair of two pixels P on the bottom.

The upper two pixels P each have an approximately trapezoidal shape and they are gathered together to form a square or a rectangle such as a rectangle. The lower two pixels P each have an approximately trapezoidal shape and they are gathered together and a square. Or a rectangle such as a rectangle.

Each of the two pairs of pixels P is provided with a thin film transistor T, respectively. The thin film transistor T is formed in a narrow portion or a wide portion in the trapezoidal pixels P to maximize the aperture ratio.

Although not shown in the drawing, a common electrode and a pixel electrode are formed in the pixel P to generate a fringe field, and the pixel electrode may be formed in a substantially trapezoidal shape in each pixel P. Referring to FIG. The common electrode may be formed in a single pattern over the entire pixel portion, and may have a plurality of slits in each pixel P. FIG. The common electrode between the plurality of slits may have a finger shape.

In this case, the two pairs of pixels P are divided into left and right by a data line 217 (hereinafter, referred to as a reference data line) positioned at the left and right middles of the two pairs of pixels P. 217 is formed to be inclined at an angle. In addition, the finger-shaped common electrode including the plurality of slits is inclined in correspondence to the inclined angle. For reference, the arrow direction shown indicates a direction in which the finger-shaped common electrode including the plurality of slits is inclined, and the reference data line 217 is a gate line 216 between upper and lower pixels P. Referring to FIG. It will be configured to bend around.

As the reference data line 217 is formed to be inclined between the upper pair of pixels P, two domains are formed in the upper pair of pixels P. In addition, as the reference data line 217 is inclined between the lower pair of pixels P, two domains are formed in the lower pair of pixels P. FIG.

The pixel P of the A block and the pixels P of the B block are configured such that the reference data line 217 is inclined in different directions, and accordingly, a finger type including a plurality of slits in different directions is provided. The common electrode 208 is tilted. In addition, the thin film transistor T may be formed at different positions of the pixels P of the A block and the pixels P of the B block.

The present invention can be used not only in liquid crystal display devices but also in other display devices fabricated using thin film transistors, for example, organic light emitting display devices in which organic light emitting diodes (OLEDs) are connected to driving transistors.

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 electrode
108sa, 108sb, 208sa, 208sb, 208sc, 208sd: Slit
110,210: Array Board
116n-1,116n, 216n-1,216n, 216n + 1: Gate line
117m-2,117m-1,117m, 217m-1,217m, 217m + 1: Data line
118a, 118b, 218a, 218b, 218c, 218d pixel electrodes
121a, 121b, 221a, 221b, 221c, 221d: gate electrodes
122a, 122b, 222a, 222b, 222c, 222d Source electrodes
123a, 123b, 223a, 223b, 223c, 223d: drain electrode

Claims (13)

A plurality of gate lines and data lines arranged vertically and horizontally on the array substrate to define pixels;
A thin film transistor formed at an intersection of the gate line and the data line; And
A pixel electrode formed in the pixel to generate a fringe field and a common electrode having a plurality of slits;
By configuring two pixels in pairs, the data line (hereinafter referred to as a reference data line) arranged in the middle of the pair of pixels is configured to be inclined differently from the data lines positioned to the left and right of the reference data line. A fringe field type liquid crystal display device, wherein two domains are formed in two pixels. The fringe field type liquid crystal display of claim 1, wherein each of the pair of pixels has a trapezoidal shape, and the pixels are gathered together to form a square or a rectangle. 3. The fringe field type liquid crystal display device according to claim 2, wherein the thin film transistor is formed in a narrow portion or a wide portion in the trapezoidal pixel. 3. The fringe field type liquid crystal display device according to claim 2, wherein the pixel electrode has a trapezoidal shape in each pixel. The fringe field type liquid crystal display device according to claim 4, wherein a pair of pixel electrodes formed on the pair of pixels are gathered together to form a square or a rectangle. The fringe field type liquid crystal display device according to claim 1, wherein the common electrode is formed in a single pattern over the entire pixel portion in which an image is displayed, and has a plurality of slits in each pixel. 7. The fringe field type liquid crystal display device according to claim 6, wherein the common electrode between the slits in each pixel has a finger shape. The fringe field type liquid crystal display of claim 7, wherein a common electrode having a finger shape including the plurality of slits is inclined to correspond to an inclination angle of the reference data line. The fringe field type liquid crystal display of claim 1, wherein the data lines positioned to the left and right of the reference data line are arranged substantially perpendicular to the gate line. The display device of claim 1, wherein the reference data line is bent near a gate line between an upper pair of pixels and a lower pair of pixels to intersect the upper pair of pixels and the lower pair of pixels. A fringe field type liquid crystal display device, characterized in that inclined in different directions. 11. The method of claim 10, wherein the upper pair of pixels and the lower pair of pixels gather together to form pixels of A block or pixels of B block, and the pixels of A block and pixels of B block A fringe field type liquid crystal display device, characterized in that arranged alternately. The pixel of the block A and the pixels of the block B are inclined to the reference data line in different directions, and the common electrode having a finger shape including the plurality of slits is inclined in different directions. Fringe field type liquid crystal display, characterized in that the losing. 13. The fringe field type liquid crystal display of claim 12, wherein the pixels of the A block and the pixels of the B block have thin film transistors formed at different positions.

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