KR101953248B1 - Liquid crystal display - Google Patents

Abstract

A liquid crystal display device according to an embodiment of the present invention includes a first substrate, a pixel electrode disposed on the first substrate, a second substrate facing the first substrate, a common electrode disposed on the second substrate, And a liquid crystal layer disposed between the first substrate and the second substrate, wherein the common electrode is formed in a direction parallel to the edge of the pixel electrode, and a position spaced apart from the edge of the pixel electrode And has a first cutout portion formed at a corresponding position and a second cutout portion overlapping the pixel electrode and having a cross shape.

Description

[0001] LIQUID CRYSTAL DISPLAY [0002]

The present invention relates to a liquid crystal display device.

2. Description of the Related Art [0002] A liquid crystal display device is one of the most widely used flat panel display devices, and includes two display panels having field generating electrodes such as a pixel electrode and a common electrode, and a liquid crystal layer interposed therebetween. The liquid crystal display displays an image by applying a voltage to the electric field generating electrode to apply an electric field to the liquid crystal layer, determine the direction of the liquid crystal molecules in the liquid crystal layer, and control the polarization of the incident light.

Among liquid crystal display devices, vertically aligned mode liquid crystal display devices in which liquid crystal molecules are arranged so that their long axes are perpendicular to a display panel in the absence of an electric field have been developed.

In the vertical alignment type liquid crystal display device, securing a wide viewing angle is an important problem. For this purpose, a method such as forming a slit such as a fine slit in the electric field generating electrode is used. Since the incisions and the projections determine the tilt direction of the liquid crystal molecules, the viewing angle can be widened by appropriately disposing them and dispersing the oblique direction of the liquid crystal molecules in various directions.

Particularly, in the case of forming a fine slit in the pixel electrode to have a plurality of branched electrodes, the aperture ratio of the liquid crystal display device is reduced.

Further, when a plurality of domains are formed by varying the tilting direction of the liquid crystal molecules, the display quality may be lowered at the edge portions of the pixel electrodes.

On the other hand, in a method of driving a liquid crystal display device, there is a method of applying a data voltage of the same polarity in the pixel column direction. In this driving method, an unnecessary couple between the voltage applied to the data line and the voltage applied to the common electrode By the influence of the ring, the capacitance charged in the liquid crystal layer changes for each pixel column, and the display quality can be lowered.

In order to prevent unnecessary coupling between the data line and the common electrode, a method of forming a shielding electrode to which a voltage of the same magnitude as a common voltage applied to the common electrode is applied to the data line is widely known. However, when the shielding electrode is used, not only the luminance of the liquid crystal display device is reduced but also the occurrence rate of defects in which a short circuit occurs between the shielding electrode and the data line is high, and the yield of the liquid crystal display device is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of reducing the aperture ratio of a liquid crystal display device while having a wide viewing angle and a fast response speed and capable of preventing display quality degradation at the edge portion of the pixel electrode, And to provide a liquid crystal display device capable of reducing deterioration in display quality and reducing a decrease in luminance of a liquid crystal display device and reducing a yield of a liquid crystal display device.

A liquid crystal display device according to an embodiment of the present invention includes a first substrate, a pixel electrode disposed on the first substrate, a second substrate facing the first substrate, a common electrode disposed on the second substrate, And a liquid crystal layer disposed between the first substrate and the second substrate, wherein the common electrode overlaps the pixel electrode and has a first cutout portion having a cross shape and a second cutout portion extending in a direction And a second cutout portion formed at a position corresponding to a position spaced apart from the edge of the pixel electrode.

When the width of the first incision is W1 and the width of the second incision is W2, W1 may be greater than or equal to W2.

W1 and W2 can satisfy W2? W1? 2W2.

And a data line connected to the pixel electrode, wherein at least a part of the second cutout portion overlaps with the data line.

When the first substrate and the second substrate are viewed from above, the string portion of the first cut-out portion may protrude from the edge of the pixel electrode.

The liquid crystal display device of claim 1, further comprising a first alignment layer formed on the first substrate and a second alignment layer formed on the second substrate, wherein at least one of the liquid crystal layer, the first alignment layer and the second alignment layer includes a light- can do.

The liquid crystal molecules of the liquid crystal layer may be arranged to be substantially perpendicular to the surfaces of the first substrate and the second substrate when no electric field is applied to the liquid crystal layer.

The liquid crystal molecules of the liquid crystal layer may be arranged to have a line inclination in a direction parallel to a direction from the point where the edge of the pixel electrode meets the center portion of the first cut portion of the common electrode.

Wherein the pixel electrode is divided into a plurality of sub-areas by the edge of the pixel electrode and the first cutout of the common electrode, and in the sub-area, the liquid crystal molecules of the liquid crystal layer have a line inclination in different directions .

Wherein the pixel electrode has at least one cutout portion formed at a position where two edge portions of the edge portions of the pixel electrode extending in different directions meet with each other, And extend parallel to a direction from the point toward the center portion of the second cutout of the common electrode.

The width of the pixel electrode may be increased from the edge of the pixel electrode facing the pixel electrode to the center of the pixel electrode.

The pixel electrode may have a cutout portion adjacent to at least one of edge portions of the pixel electrode and disposed along the edge in parallel with the edge portion.

According to the embodiment of the present invention, the viewing angle of the liquid crystal display device can be widened, the response speed can be increased, the aperture ratio and transmittance can be increased while the visibility is increased, and deterioration of display quality at the edge portion of the pixel electrode can be prevented, Unnecessary coupling between the data line and the common electrode is prevented to prevent deterioration of the display quality and decrease of the luminance of the liquid crystal display device and decrease of the yield of the liquid crystal display device.

1 is a layout diagram of a liquid crystal display according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the liquid crystal display device of FIG. 1 taken along line II-II.
3 is a plan view showing a basic region of an electric field generating electrode of a liquid crystal display according to an embodiment of the present invention.
4 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.
5 is a view showing a process of making liquid crystal molecules have line inclination using a prepolymer polymerized by light such as ultraviolet light.
6 is a conceptual view illustrating a liquid crystal direction in a basic region of an electric field generating electrode of a liquid crystal display device according to an embodiment of the present invention.
7A and 7B are conceptual diagrams illustrating a fringe field formation of a liquid crystal display device according to an embodiment of the present invention.
8 is a plan view showing a basic pixel region of a liquid crystal display device according to an embodiment of the present invention.
9 is a plan view showing one pixel region of a liquid crystal display device according to another embodiment of the present invention.
10A and 10B are plan views showing the results of transmission of a liquid crystal display device according to an experimental example of the present invention.
11 to 18 are plan views showing the transmittance of the liquid crystal display device and the arrangement direction of the liquid crystal director according to one experimental example of the present invention.
19 is a graph showing a result of transmission of a liquid crystal display device according to an experimental example of the present invention.
20 is a plan view showing a basic region of an electric field generating electrode of a liquid crystal display according to another embodiment of the present invention.
21 is a plan view showing a basic region of an electric field generating electrode of a liquid crystal display device according to another embodiment of the present invention.
22 is a plan view showing a basic region of an electric field generating electrode of a liquid crystal display according to another embodiment of the present invention.
23 is a plan view showing a basic region of an electric field generating electrode of a liquid crystal display device according to another embodiment of the present invention.
24 is a layout diagram of a liquid crystal display device according to another embodiment of the present invention.
25 is a plan view showing a basic pixel region of a liquid crystal display device according to another embodiment of the present invention.
26 is a plan view showing a basic pixel region of a liquid crystal display device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. Whenever a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case where it is "directly on" another portion, but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

A liquid crystal display according to an embodiment of the present invention will now be briefly described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a layout diagram of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, FIG. 4 is an equivalent circuit diagram of a pixel of a liquid crystal display according to an embodiment of the present invention. Referring to FIG.

4, a liquid crystal display according to an exemplary embodiment of the present invention includes a signal line including a gate line 121, a sustain electrode line 125, a depression gate line 123, and a data line 171, And a pixel PX connected thereto.

The pixel PX includes first, second and third switching elements Qh, Ql and Qc, first and second liquid crystal capacitors Clch and Clcl, first and second holding capacitors Csth and Cstl, And a decompression capacitor Cstd. Here, the first switching device Qh and the first thin film transistor Qh, the second switching device Ql and the second thin film transistor Ql, the third switching device Qc and the third thin film transistor Qc Are denoted by the same reference numerals.

The first and second switching elements Qh and Ql are connected to the gate line 121 and the data line 171 respectively and the third switching element Qc is connected to the voltage-

The first and second switching elements Qh and Q1 are three terminal elements such as a thin film transistor provided in the lower panel 100. The control terminal is connected to the gate line 121, And the output terminal is connected to the first and second liquid crystal capacitors Clch and Clcl and the first and second storage capacitors Csth and Cstl, respectively.

The third switching device Qc is also a three terminal device such as a thin film transistor provided in the lower panel 100. The control terminal is connected to the depression gate line 123 and the input terminal is connected to the second liquid crystal capacitor Clcl, And the output terminal is connected to the reduced-pressure storage capacitor Cstd.

The first and second liquid crystal capacitors Clch and Clcl are connected to the first and second sub-pixel electrodes 191h and 191l connected to the first and second switching devices Qh and Ql, (270) are overlapped. The first and second storage capacitors Csth and Cstl are formed by overlapping the sustain electrode lines 125 including the sustain electrodes and the first and second sub-pixel electrodes 191h and 191l.

The decompression capacitor Cstd is connected to the output terminal of the third switching device Qc and the sustain electrode line 125 and is connected to the output terminal of the third switching device Qc Terminals are overlapped with each other with an insulator interposed therebetween.

Hereinafter, the liquid crystal display according to the present embodiment will be described in more detail with reference to FIGS. 1 and 2. FIG.

1 and 2, the liquid crystal display according to the present embodiment includes a lower panel 100 and an upper panel 200 facing each other, a liquid crystal layer 3 interposed between the two panels 100 and 200, And a pair of polarizers (not shown) attached to the outer surfaces of the display panels 100 and 200.

First, the lower panel 100 will be described.

A plurality of gate conductors including a plurality of gate lines 121, a plurality of depressed gate lines 123 and a plurality of sustain electrode lines 125 is formed on an insulating substrate 110. [

The gate line 121 and the decompression gate line 123 extend mainly in the lateral direction and transfer gate signals. The gate line 121 includes a first gate electrode 124h and a second gate electrode 124l projecting upward and downward and the decompression gate line 123 includes a third gate electrode 124c protruding upward. The first gate electrode 124h and the second gate electrode 124l are connected to each other to form one protrusion.

The storage electrode line 125 also extends in the lateral direction mainly and delivers a predetermined voltage such as the common voltage Vcom. The sustain electrode line 125 includes a sustain electrode extending along at least one edge of the pixel electrodes 191h and 191l and includes a downwardly extending capacitive electrode 126. [

A gate insulating layer 140 is formed on the gate conductors 121, 123, and 125.

On the gate insulating film 140, a plurality of semiconductors 154h, 154l, 151c and 157 which can be made of amorphous or crystalline silicon are formed. The first and second semiconductor layers 154h and 154l extend toward the first and second gate electrodes 124h and 124l and the first and second semiconductor layers 154h and 154l are connected to each other. And a third semiconductor 154c connected to the third semiconductor 154c. The third semiconductor 154c is extended to form the fourth semiconductor 157.

A plurality of linear resistive ohmic contacts 164b and 167 are formed on the semiconductor 151. A first resistive contact member (not shown) is formed on the first semiconductor 154h, A second resistive contact member 164b and a third resistive contact member (not shown) are formed on the first semiconductor layer 154l and the third semiconductor 154c, respectively. The third resistive contact member extends to form a fourth resistive contact member 167.

A plurality of data lines 171, a plurality of first drain electrodes 175h, a plurality of second drain electrodes 175l and a plurality of third drain electrodes 175c are formed on the resistive contact members 164b and 167, ) Are formed on the substrate.

The data line 171 transmits the data signal and extends mainly in the vertical direction and crosses the gate line 121 and the decompression gate line 123. Each data line 171 extends toward the first gate electrode 124h and the second gate electrode 124l and includes a first source electrode 173h and a second source electrode 173l connected to each other.

The first drain electrode 175h, the second drain electrode 1751, and the third drain electrode 175c include a wide one end and a rod-shaped other end. The rod-shaped end portions of the first drain electrode 175h and the second drain electrode 175l are partially surrounded by the first source electrode 173h and the second source electrode 173l. The wide one end of the second drain electrode 175l extends again to form a third source electrode 173c bent in a U-shape. The wide end portion 177c of the third drain electrode 175c overlaps with the capacitor electrode 126 to form a reduced-pressure capacitor Cstd and the rod-end portion is partially surrounded by the third source electrode 173c.

The first, second, and third gate electrodes 124h / 124l / 124c, first / second / third source electrodes 173h / 173l / 173c and first / second / third drain electrodes 175h / 175l / 175c together with the first / second / third semiconductors 154h / 154l / 154c form one first / second / third thin film transistor (TFT) Qh / Ql / Qc Channel of the thin film transistor is formed in each semiconductor 154h / 154l / 154c between each source electrode 173h / 173l / 173c and each drain electrode 175h / 175l / 175c.

The semiconductors 154h, 154l and 154c are connected to the data conductors 171, 175h, 175l and 175c except for the channel region between the source electrodes 173h, 173l and 173c and the drain electrodes 175h, 175l and 175c, And may have substantially the same planar shape as the lower resistive contact members 164l and 167. [ That is, the semiconductor 151 including the semiconductors 154h, 154l, and 154c is electrically connected to the data conductors 171, 175h, 175l, 175l, 175l, 175l, 175l, and between the source electrodes 173h, 173l, 173c and the drain electrodes 175h, 175l, 175c.

A lower protective film 180p that can be made of an inorganic insulating material such as silicon nitride or silicon oxide is formed on the data conductors 171, 175h, 175l, and 175c and exposed semiconductor portions 154h, 154l, and 154c.

A color filter 230 is disposed on the lower protective film 180p. The color filter 230 is located in most of the regions except where the first thin film transistor Qh, the second thin film transistor Ql and the third thin film transistor Qc are located. However, the color filter 230 may be formed on the upper panel 200 or may extend vertically along the adjacent data lines 171. Each color filter 230 may display one of the primary colors, such as the three primary colors of red, green, and blue.

A light blocking member 220 is disposed on a portion of the color filter 230 where the color filter 230 is not located. The light shielding member is also called a black matrix and blocks light leakage. The light shielding member extends along the gate line 121 and the decompression gate line 123 and covers the region where the first thin film transistor Qh, the second thin film transistor Ql, the third thin film transistor Qc, And a second light blocking member (not shown) extending along the data line 171 and a first light blocking member (not shown). The height of a part of the light shielding member 220 may be lower than the height of the color filter 230.

An upper protective film 180q is formed on the color filter 230 and the light shielding member 220. [ The upper protective film 180q prevents the color filter 230 and the light shielding member 220 from being lifted and suppresses the contamination of the liquid crystal layer 3 by organic substances such as a solvent flowing from the color filter 230, Thereby preventing defects such as afterimage that may occur during driving.

A plurality of first contact holes 180a are formed in the lower protective film 180p, the light shielding member 220 and the upper protective film 180q to expose the wide end of the first drain electrode 175h and the wide end of the second drain electrode 175l, A plurality of second contact holes 185l and a plurality of second contact holes 185l are formed.

A plurality of pixel electrodes 191 are formed on the upper protective film 180q.

1, each of the pixel electrodes 191 is separated from each other with two gate lines 121 and 123 therebetween and is disposed above and below the pixel region with respect to the gate lines 121 and 123, And includes a first sub-pixel electrode 191h and a second sub-pixel electrode 191l which are adjacent to each other.

The first sub-pixel electrode 191h and the second sub-pixel electrode 191l are connected to the first drain electrode 175h and the second drain electrode 175l through the first contact hole 185h and the second contact hole 185l, And the data voltage is applied to the data lines. The first sub-pixel electrode 191h and the second sub-pixel electrode 191l to which the data voltage is applied are generated together with the common electrode 270 of the common electrode panel 200, The direction of the liquid crystal molecules of the liquid crystal layer 3 is determined. The luminance of the light passing through the liquid crystal layer 3 varies depending on the orientation of the liquid crystal molecules thus determined.

The first sub pixel electrode 191h and the common electrode 270 constitute a first liquid crystal capacitor Clch together with the liquid crystal layer 3 therebetween and the second sub pixel electrode 191l and the common electrode 270 form a first liquid crystal capacitor The applied voltage is maintained even after the first and second thin film transistors Qh and Ql are turned off by forming the second liquid crystal capacitor Clcl together with the liquid crystal layer 3 therebetween.

The first and second sub-pixel electrodes 191h and 1911 overlap the sustain electrode lines 125 including the sustain electrodes 129 to form the first and second sustain capacitors Csth and Cstl, The capacitors Csth and Cstl enhance the voltage holding capability of the first and second liquid crystal capacitors Clch and Clcl, respectively.

The capacitor electrode 126 and the extended portion 177c of the third drain electrode 175c overlap each other with the gate insulating film 140 and the semiconductor layers 157 and 167 interposed therebetween to form a reduced-pressure capacitor Cstd. In another embodiment of the present invention, the semiconductor layers 157 and 167 disposed between the capacitor electrode 126 forming the decompression capacitor Cstd and the extension 177c of the third drain electrode 175c are removed .

A coloring member 320 is formed on the upper protective film 180q. The coloring member 320 is disposed on the light shielding member 220. The coloring member 320 extends upward and downward to cover the gate line 121 and the decompression gate line 123 and cover the gate line 121 and the decompression gate line 123. The coloring member 320 includes a first thin film transistor Qh, A first coloring member (not shown) extending along the first light blocking member covering an area where the second thin film transistor Ql and the third thin film transistor Qc are located and a first coloring member (not shown) extending along the data line 171 And a second coloring member (not shown) extending along the second light-shielding member.

The coloring member 320 compensates for the height difference between the light blocking member 220 and the color filter 230 to remove the liquid crystal layer disposed on the color filter 230 and the liquid crystal layer disposed on the light blocking member 220 And the light shielding function of the light shielding member 220 is strengthened. Since the coloring member 320 compensates for the height difference between the light blocking member 220 and the color filter 230, the liquid crystal molecules disposed between the light blocking member 220 and the color filter 230 are blocked by the light blocking member 220 And the color filter 230, it is possible to prevent light leakage or the like at the edge portion of the pixel electrode which is generated. Further, since the cell spacing on the light shielding member 220 is reduced, the average cell spacing is reduced, and thus the total amount of liquid crystal used in the liquid crystal display device can be reduced.

A lower alignment layer (not shown) is formed on the pixel electrode 191, the exposed upper protective layer 180q, and the coloring member 320. The lower alignment film may be a vertical alignment film, and may include a photoreactive material.

Next, the upper display panel 200 will be described.

A common electrode 270 is formed on the insulating substrate 210. The common electrode 270 has a first cutout portion 271a, a second cutout portion 271b, a plurality of third cutouts 281a, and a plurality of fourth cutouts 281b. The width of the third cutout portion 281a of the common electrode 270 is equal to or smaller than the width of the cutouts 271a and 271b of the crossed portion of the common electrode 270, The width of the cutout portions 271a and 271b may be equal to or about twice the width of the third cutout portion 281a of the common electrode 270. [ That is, if the width of the cross-sectional cutout portions 271a and 271b of the common electrode 270 is W1 and the width of the third cutout portion 281a of the common electrode 270 is W2, then W2 < 2W2 can be satisfied.

The first cutout portion 271a of the common electrode 270 is disposed at a position corresponding to the first sub-pixel electrode 191h and the second cutout portion 271b is disposed at a position corresponding to the second sub- .

The first cutout portion 271a and the second cutout portion 271b may have a cross shape when viewed in a planar shape and the end portions thereof may correspond to the first sub-pixel electrode 191h and the second sub- 191l. By forming the end portion of the cutout portion of the common electrode 270 so as to protrude beyond the edge of the pixel electrode, the influence of the fringe field can stably reach the edge of the pixel region, Direction.

The first cutout portion 271a and the second cutout portion 271b and the edges of the first sub-pixel electrode 191h and the second sub-pixel electrode 1911 form the first sub-pixel electrode 191h and the second sub- The sub-pixel electrode 191l may be divided into a plurality of sub-regions.

The third cutout portion 281a of the common electrode 270 is disposed in parallel with the edge of the first sub-pixel electrode 191h and the second sub-pixel electrode 191l in parallel with the data line, The first sub-pixel electrode 191h and the second sub-pixel electrode 191l are spaced apart from the edges of the first sub-pixel electrode 191h and the second sub-pixel electrode 191l.

The fourth cutout portion 281b of the common electrode 270 is disposed in parallel to the edge of the first sub-pixel electrode 191h and the second sub-pixel electrode 191l in parallel with the gate line, The first sub-pixel electrode 191h and the second sub-pixel electrode 191l are spaced apart from the edges of the first sub-pixel electrode 191h and the second sub-pixel electrode 191l. The third cutout portion 281a of the common electrode 270 may overlap at least part of the data line 171. [ The third cutout 281a serves to reduce the coupling between the data line 171 disposed on the lower panel 100 and the common electrode 270 of the upper panel 200. [ Therefore, it is possible to prevent deterioration in image quality due to unnecessary coupling between the data line and the common electrode of the liquid crystal display device, and to prevent the shielding electrode from being applied with a voltage of the same magnitude as the common voltage applied to the common electrode on the data line, It is possible to prevent short-circuiting between the shielding electrode and the data line. Thus, it is possible to prevent a reduction in the yield of the liquid crystal display device due to short-circuiting between the shielding electrode and the data line.

The third cutout portion 281a and the fourth cutout portion 281b of the common electrode 270 may be spaced apart from the first cutout portion 271a and the second cutout portion 271b of the common electrode 270 have.

The third cutout portion 281a and the fourth cutout portion 281b of the common electrode 270 control the influence of the fringe field on the edges of the pixel electrodes 191h and 191l, It is possible to adjust the direction in which the liquid crystal molecules disposed at the edges are tilted. The third cutout portion 281a of the common electrode 270 overlaps the data line 171 at least partially to reduce the parasitic capacitance that may be formed between the common electrode 270 and the data line 171 . Therefore, it is possible to prevent image quality deterioration due to unnecessary coupling between the data line and the common electrode of the liquid crystal display device, without forming an additional shielding electrode.

An upper alignment layer (not shown) is formed on the common electrode 270. The upper alignment film may be a vertical alignment film or an alignment film containing a photoreactive material.

A polarizer (not shown) is provided on the outer surface of the two display panels 100 and 200, and the transmission axes of the two polarizers are orthogonal, and one of the two transmission axes is parallel to the gate line 121. However, the polarizer may be disposed only on the outer surface of any one of the two display panels 100 and 200.

The liquid crystal layer 3 includes liquid crystal molecules 31 having negative dielectric anisotropy. The liquid crystal layer 3 may contain a polymer. The long axis of the liquid crystal molecules 31 may be perpendicular to the surface of the two display panels 100 and 200 without the electric field and the long axis of the liquid crystal molecules 31 may be cut out from the cutout portions 271a and 271b The edges of the sub-pixel electrodes 191h and 191l form openings 271a and 271b of the cross-shaped common electrode 270 from the four portions where the edges extending in different directions of the sub-pixel electrodes 191h and 191l meet With a line inclination (pretilt) so as to be substantially parallel to the direction toward the center portion of the center line (i.e. Accordingly, each of the first and second sub-pixels has four sub-regions having different line inclination directions of the liquid crystal. Therefore, in the absence of an electric field, the incident light is blocked without passing through the orthogonal polarizer.

As described above, the first sub-pixel electrode 191h and the second sub-pixel electrode 191l to which the data voltage is applied generate an electric field together with the common electrode 270 of the common electrode panel 200, The liquid crystal molecules of the liquid crystal layer 3 oriented so as to be perpendicular to the surfaces of the two electrodes 191 and 270 are laid down in the horizontal direction with respect to the surfaces of the two electrodes 191 and 270, The brightness of light passing through the liquid crystal layer 3 varies.

According to another embodiment of the present invention, the liquid crystal display may further include a spacing member 325 for maintaining the cell spacing between the two display plates 100 and 200, and the spacing member 325 may include a coloring member 320 ) And the same layer at the same time.

The driving method of the liquid crystal display device shown in Figs. 1 and 2 will now be described with reference to Fig. 4 together with Figs. 1 and 2. Fig.

When a gate-on signal is applied to the gate line 121, the first switching device Qh and the second switching device Ql connected thereto are turned on. Accordingly, the data voltage applied to the data line 171 is applied to the first sub-pixel electrode and the second sub-pixel electrode through the turned-on first switching device Qh and the second switching device Q1. At this time, the data voltages applied to the first sub-pixel electrode 191h and the second sub-pixel electrode 191l have the same magnitude. Therefore, the voltages charged in the first and second liquid crystal capacitors Clch and Clcl are the same. Thereafter, when a gate off signal is applied to the gate line 121 and a gate on signal is applied to the reduced gate line 123, the first switching device Qh and the second switching device Ql are turned off, The third switching element Qc is turned on. Then, charge moves from the second sub-pixel electrode 191l to the decompression capacitor Cstd through the third switching device Qc. Then, the charging voltage of the second liquid crystal capacitor Clcl is lowered, and the reduced-pressure storage capacitor Cstd is charged. The charging voltage of the second liquid crystal capacitor Clcl is lower than the charging voltage of the first liquid crystal capacitor Clch since the charging voltage of the second liquid crystal capacitor Clcl is lowered by the capacitance of the decompressing capacitor Cstd.

At this time, the charging voltages of the two liquid crystal capacitors (Clch and Clcl) represent different gamma curves, and the gamma curves of one pixel voltage are the combined curves thereof. The composite gamma curve at the front is made to coincide with the reference gamma curve at the front determined to be most suitable, and the composite gamma curve at the side is made closest to the reference gamma curve at the front. By converting the image data as described above, the side viewability is improved.

3, a basic region of the electric field generating electrode of the liquid crystal display device according to an embodiment of the present invention will be described.

3, the basic region of the electric field generating electrode is composed of the openings 271, 281a, and 281b of the common electrode 270 and the pixel electrode 191. In addition, The basic region defined by the opening 271 of the common electrode 270 and the edge of the pixel electrode 191 can be divided into a plurality of small regions Da, Db, Dc, and Dd And the plurality of small regions may be symmetrical with respect to the opening 271 of the common electrode 270.

The cutout portion 271 of the common electrode 270 may have a cross shape when viewed in a plan view and the end portion 272 of the cutout portion 271 may have a cross shape as shown in FIG. It protrudes beyond the edge. The cross-shaped cutout 271 of the common electrode 270 may have a width of about 2 占 퐉 to about 10 占 퐉.

The third cutout portion 281a of the common electrode 270 is arranged in parallel to the two edges of the pixel electrode 191 in parallel with the data line, And is disposed at a position spaced apart from the edge.

The fourth cutout portion 281b of the common electrode 270 is disposed in parallel to the two edges of the pixel electrode 191 in parallel with the gate line, And is disposed at a position spaced apart from the edge.

The third cutout portion 281a and the fourth cutout portion 281b of the common electrode 270 are spaced apart from the cutout portion 271 of the common electrode 270. [ The width of the third cutout portion 281a of the common electrode 270 is equal to or smaller than the width of the cutout portion 271 of the crossed portion of the common electrode 270, The width of the second cutout portion 271 may be equal to or about twice the width of the third cutout portion 281a of the common electrode 270. [ That is, assuming that the cross section of the common electrode 270 has a width of W1 and the width of the third cutout portion 281a of the common electrode 270 is W2, W2? W1? Can be satisfied.

As described above, the liquid crystal layer 3 interposed between the lower panel 100 and the upper panel 200 includes the liquid crystal molecules 31 having a negative dielectric anisotropy, and may further include a polymer.

Next, referring to Figs. 5 and 6, a method of initial alignment so that the liquid crystal molecules 31 have a line inclination will be described. FIG. 5 is a view showing a process of making liquid crystal molecules have a line inclination by using a prepolymer polymerized by light such as ultraviolet rays, and FIG. 6 is a view showing a process of forming the electric field generating electrode of a liquid crystal display according to an embodiment of the present invention Lt; RTI ID = 0.0 > region. ≪ / RTI >

A prepolymer 330 such as a monomer which is cured by polymerization by light such as ultraviolet light is injected between two display panels 100 and 200 together with a liquid crystal material. At this time, the prepolymer 330 may be included not only in the liquid crystal layer but also in an alignment film (not shown) formed on the two display panels 100 and 200. The prepolymer 330 may be a reactive mesogen that undergoes a polymerization reaction with light such as ultraviolet light.

A data voltage is applied to the first and second sub-pixel electrodes 191h and 1911 and a common voltage is applied to the common electrode 270 of the upper panel 200 to form a liquid crystal layer 3 ). ≪ / RTI > The liquid crystal molecules 31 of the liquid crystal layer 3 are driven by the fringe fields of the edges of the cutout portion 271 and the pixel electrode 191 of the common electrode 270 in response to the electric field, From the four portions where the edges extending in different directions of the common electrode 270 cross each other in the direction of the central portion of the opening 271 of the cross-shaped common electrode 270, The directions in which the liquid crystal molecules 31 are inclined are four directions in total.

This will be described with reference to FIG. 6A, directors 301a and 301b of liquid crystal molecules in a portion adjacent to the edge of the pixel electrode 191 constituting the basic region of the electric field generating electrode are perpendicular to the edges of the pixel electrode 191 . The directors 302a and 302b of the liquid crystal molecules in the portion adjacent to the cutout portion 271 of the common electrode constituting the basic region of the electric field generating electrode are aligned with the edges of the cutout portion 271 of the common electrode 270, . As described above, the liquid crystal molecules according to the fringe field generated by the magnetic field of the pixel electrode 191 forming the basic region of the electric field generating electrode and the cutout portion 271 of the common electrode are firstly determined, And the secondary array direction is a vector sum direction of the direction in which each direction is directed. 6 (b), finally, the liquid crystal director has the opening 271 of the cross-shaped common electrode 270 from the four portions where the edges extending in different directions of the pixel electrode 191 meet, In the direction of the center portion. The third cutout portion 281a and the fourth cutout portion 281b formed on the common electrode 270 adjust the size of the fringe field applied to the magnetic field of the pixel electrode 191, The number of liquid crystal molecules having the directors 301a and 301b perpendicular to the edge of the pixel electrode 191 in the vicinity of the edge of the pixel electrode 191 is reduced so that many liquid crystal molecules Helping to be a secondary array 303. This prevents the liquid crystal molecules from tilting in the direction perpendicular to the edge of the pixel electrode at the edge portion of the pixel electrode, thereby preventing display quality from deteriorating. Specifically, when the liquid crystal molecules are viewed in a horizontal plane, the liquid crystal molecules may be tilted so as to form a certain angle with the edge of the pixel electrode 191, not in a direction perpendicular to the edge of the pixel electrode 191.

The alignment of the liquid crystal molecules 31 along the fringe field is similarly performed in each of the sub-regions Da, Db, Dc, and Dd, and the direction in which the liquid crystal molecules are tilted in each basic region of the electric field generating electrode is Four directions. Specifically, in the first region of each sub-region, the arrangement of the director of the liquid crystal molecules 31 is obliquely arranged in the lower right direction from the pixel edge toward the center portion of the opening portion 271, and in the second region, The array of the directors of the molecules 31 is obliquely arranged in the lower left direction so as to face the middle portion of the openings 271 from the pixel edges and the arrangement of the directors of the liquid crystal molecules 31 in the third region is made from the edge 271, and the arrangement of the director of the liquid crystal molecules 31 in the fourth region is made obliquely upward from the pixel edge toward the center of the opening 271 It can be made oblique.

When an electric field is generated in the liquid crystal layer 3 and then light such as ultraviolet light is irradiated, the prepolymer 330 undergoes a polymerization reaction to form a polymer 370. The polymer 370 is formed in contact with the display plates 100 and 200. If the alignment film contains the prepolymer 330, the prepolymer of the alignment film is polymerized to form the polymer 370 in the alignment film. The orientation of the liquid crystal molecules 31 is determined by the polymer 370 so that the liquid crystal molecules 31 have a line inclination in the direction described above. Therefore, even when no electric field is applied to the electric field generating electrodes 191 and 270, the liquid crystal molecules 31 are arranged in a line inclination in four different directions.

7A and 7B, the liquid crystal director along the third cutout portion 281a and the fourth cutout portion 281b of the common electrode 270 of the liquid crystal display device according to the embodiment of the present invention Will be described in detail.

7A shows a case where an opening 281 of the common electrode 270 is formed outside the pixel electrode 191 and in parallel with the edge of the pixel electrode 191 as in the liquid crystal display according to the embodiment of the present invention. 7B shows a case in which the opening 281 of the common electrode 270 is not formed outside the pixel electrode 191 in the same position as the edge of the pixel electrode 191 as in the conventional liquid crystal display device will be.

7A, an opening 281 of the common electrode 270, which is parallel to the edge of the pixel electrode 191, is formed outside the pixel electrode 191, as in the liquid crystal display device according to the embodiment of the present invention The fringe fields F1 and F2 formed by applying a voltage to the common electrode 270 and the pixel electrode 191 are separated from the first fringe field F1 by the openings 281 of the common electrode 270 And a second fringe field F2. That is, the opening 281 of the common electrode 270 serves to reduce the size of the fringe field formed along the edge of the pixel electrode 191. The opening 281 is formed in the region where the first fringe field F1 is formed by the end of the common electrode 270 adjacent to the edge 191 of the pixel electrode 191 and the edge of the edge of the pixel electrode 191 The common electrode 270 is removed from the region A between the regions where the second fringe field F2 is formed by the end portion of the common electrode 270 spaced from the first fringing region 191 by the opening 281, The field is not formed and the size of the second fringe field F2 becomes smaller than the size of the first fringe field F1. 7B, the opening 281 of the common electrode 270 is not formed on the outside of the pixel electrode 191, which is parallel to the edge of the pixel electrode 191, as in the conventional liquid crystal display device A continuous fringe field F is formed by the common electrode 270 continuously formed at the edge of the pixel electrode 191. In this case, Therefore, when the opening 281 of the common electrode 270 is formed outside the pixel electrode 191 at the edge of the pixel electrode 191 as in the liquid crystal display device according to the embodiment of the present invention, The size of the fringe field applied to the edge of the pixel electrode 191 can be adjusted because the fringe field is not formed in the region A where the pixel electrode 191 is formed. Therefore, the influence of the fringe field applied to the liquid crystal molecules 31 disposed adjacent to the edge of the pixel electrode 191 is reduced, and the liquid crystal molecules 31 disposed adjacent to the edge of the pixel electrode 191, Is prevented from being degraded due to the inclination of the liquid crystal molecules in the direction perpendicular to the edge of the pixel electrode 191 by controlling the tilt of the pixel electrode 191 in a direction perpendicular to the edge of the pixel electrode 191 can do.

Next, a basic region of the electric field generating electrode of the liquid crystal display device according to another embodiment of the present invention will be described with reference to FIG.

8, the third cutout portion 281a of the common electrode 270 of the liquid crystal display device according to the present embodiment is spaced apart from the common electrode 270 and is substantially equal to the edge of the pixel electrode 191 It is stretched to have a length. 3, the third cutout portion 281a of the common electrode 270 of the liquid crystal display according to the above-described embodiment is formed to be shorter than the edge length of the pixel electrode 191, The third cutout portion 281a of the common electrode 270 according to the present embodiment is also formed in a portion adjacent to the cross cutout portion 271 have.

The shape of the third cutout portion 281a of the common electrode 270 can be variously changed and is set to be equal to at least a part of the edges of the pixel electrode 191, And may be arranged to correspond to the spaced positions.

Meanwhile, in the liquid crystal display device according to the above-described embodiment, the common electrode 270 has one cross-shaped cutout portion 271 disposed at a position corresponding to each of the sub-pixel electrodes 191h and 1911, The pixel electrodes 191h and 191l and the common electrode 270 have four sub-regions. However, according to another embodiment of the present invention, the square-shaped opening 271 A plurality of basic regions of the electric field generating electrodes described with reference to FIG. 4 may be formed in one pixel region.

This will be described with reference to FIG. 9 is a plan view showing one pixel region of a liquid crystal display device according to another embodiment of the present invention.

Referring to FIG. 9, the cutout portion 271 of the common electrode 270 corresponding to the pixel electrode 191 disposed in one pixel region has twelve basic cross-shaped portions. The pixel electrode 191 has an edge 192 formed to surround the basic cross shape of the cutout portion 271 of each common electrode 270. Therefore, in one pixel region, there are twelve basic regions of the electric field generating electrode described with reference to FIG.

As described above, the number of the basic regions of the electric field generating electrode formed in each pixel region may be different depending on the size of the pixel or other conditions.

10A and 10B, the transmission of the liquid crystal display device according to one experimental example of the present invention will be described. 10A and 10B are plan views showing the results of transmission of a liquid crystal display device according to an experimental example of the present invention.

In this experimental example, the cross-shaped cutout 271 of the common electrode 270 is formed to have a width of about 3 μm, about 5 μm, about 7 μm, and about 10 μm, and the pixel electrode 191 of the common electrode 270, The width of the third cut portion 281a formed at the position surrounding the edge of the liquid crystal layer is set to about 5 mu m and the transmittance ratio when the voltage difference between the two electric field generating electrodes applying the electric field to the liquid crystal layer is set to about 2 V Is shown in Fig. 10A, and the result of the transmittance when the voltage difference between two electric field generating electrodes applying an electric field to the liquid crystal layer is set to about 7V is shown in Fig. 10B. (A) is a cross-sectional cutout 271 having a width of about 3 占 퐉 and a third cutout 281a formed at a position surrounding the edge of the pixel electrode 191 of the common electrode 270 (B) shows a cross section of the third cutout 281a formed at a position surrounding the edge of the pixel electrode 191 with a width of the cross cutout 271 of about 5 占 퐉, The width of the pixel electrode 191 is about 5 占 퐉, the width of the cross-shaped cutout 271 is about 7 占 퐉, the width of the third cutout 281a formed at a position surrounding the edge of the pixel electrode 191 The width of the cross electrode 271 is about 10 mu m and the width of the pixel electrode 191 of the common electrode 270 is about 5 mu m, The width of the three incisions 281a is about 5 mu m.

10A and 10B, when the width of the third cutout portion 281a of the common electrode 270 is larger than the width of the cross-section cutout portion 271 of the common electrode 270 (FIGS. 10A and 10B) The width of the cut-out portion 271 in the shape of a cross of the common electrode 270 is smaller than the width of the cross-shaped cutout portion 271 of the common electrode 270 in the third cutout portion of the common electrode 270, as in the liquid crystal display device according to the embodiment of the present invention, The width of the cross section of the cutout portion 271 of the common electrode 270 is W1 and the width of the third cutout portion 271 of the common electrode 270 is W1, The width of the liquid crystal display device 281a is W2 and the case where W2? W1? 2W2 is satisfied (Figs. 10A and 10B, And it was found that the decrease in transmittance at the edge of the pixel electrode could be prevented.

The results of Figs. 10A and 10B are specifically shown in Figs. 11 to 18 together with the arrangement direction of the liquid crystal director. 11 to 18 are plan views showing the transmittance of the liquid crystal display device and the arrangement direction of the liquid crystal director according to one experimental example of the present invention. Figs. 11 to 18 (a) are diagrams showing the results of the transmittance, and Fig. 11 (b) are plan views showing the alignment directions of the liquid crystal directors.

Figs. 11 and 12 show the case of Figs. 10A and 10B (a), Figs. 13 and 14 show the case of Figs. 10A and 10B (b), Figs. 15 and 16 show the case of Figs. (C) of FIG. 10B, and FIGS. 17 and 18 show the case of FIGS. 10A and 10B (d).

11, the width of the cruciform cutout portion 271 is about 3 占 퐉, and the width of the third cutout portion 281a formed at the position surrounding the edge of the pixel electrode 191 of the common electrode 270 is When the intensity of the electric field applied to the liquid crystal layer is relatively small, it is found that the liquid crystal molecules are arranged in a shape similar to a whirlpool at the center portion of the pixel electrode. 12, the width of the cross-shaped cutout portion 271 is about 3 占 퐉 and the width of the third cutout portion 281a formed at a position surrounding the edge of the pixel electrode 191 of the common electrode 270 Even if the intensity of the electric field applied to the liquid crystal layer is relatively large in the case of a width of about 5 占 퐉, the liquid crystal molecules arranged in the region corresponding to the cross-shaped cutout portion 271 are not cross- (271) are arranged in the same direction. That is, it was found that the behavior of the liquid crystal molecules was very irregular at the domain boundary of the pixel electrode 191.

13 and 14, the width of the cruciform cutout portion 271 is about 5 mu m, and the width of the third cutout portion 281a formed at the position surrounding the edge of the pixel electrode 191 is about Even if the intensity of the electric field applied to the liquid crystal layer is small, irregular behavior of the liquid crystal molecules in the central portion of the pixel electrode is very small, and even if the intensity of the electric field applied to the liquid crystal layer is large, It can be seen that the irregular behavior of the molecules is very small. Similarly, as shown in Figs. 15 and 16, the width of the cruciform cutout portion 271 is about 7 mu m, and the third cutout portion 281a formed at a position surrounding the edge of the pixel electrode 191, 17 and 18, the width of the cross-shaped cutout 271 is about 10 mu m, and the edge of the pixel electrode 191 of the common electrode 270 is set to be about 10 mu m In the case where the width of the third cut-out portion 281a formed at the surrounding position is about 5 mu m, irregular behavior of the liquid crystal molecules is very small even in the central portion of the pixel electrode even if the intensity of the electric field applied to the liquid crystal layer is small, The irregular behavior of the liquid crystal molecules at the domain boundary of the pixel electrode 191 is very small even if the intensity of the generated electric field is large

That is, like the liquid crystal display device according to the embodiment of the present invention, the width of the cross-section cutout portion 271 of the common electrode 270 is equal to the width of the third cutout portion 281a of the common electrode 270 The width of the cross section of the common electrode 270 is W1 and the width of the third cutout 281a of the common electrode 270 is W2 (B), (c), and (d) of FIGS. 10A and 10B), it was found that the transmissivity of the liquid crystal display device was high, It was found that the irregular behavior of the liquid crystal molecules at the domain boundary portion was reduced, thereby preventing the decrease of the transmissivity at the domain boundary.

Referring to FIG. 19, the result of transmission of the liquid crystal display device according to one experimental example of the present invention will be described. 19 is a graph showing a result of transmission of a liquid crystal display device according to an experimental example of the present invention.

In the present experimental example, in the case of forming a pixel electrode with a cross-shaped stripe portion and a fine branch electrode extending from the stripe portion to form four domains (R) as in the conventional liquid crystal display device, A third cutout portion 281a of the common electrode 270 is formed at a position surrounding the edge of the pixel electrode 191 in addition to the cross cutout portion 271 of the common electrode 270 as in the liquid crystal display device according to the embodiment The total transmittance of (x, y) when formed is expressed as a ratio.

In the first experimental example (x), the width of the third cutout portion 281a of the common electrode 270 was about 5 占 퐉, and the width of the cross cutout portion 271 of the common electrode 270 was about 3 占 퐉 (X1), the width of the cross-shaped cutout portion 271 of the common electrode 270 is about 5 mu m (X2), and the width of the cross-shaped cutout portion 271 of the common electrode 270 is about The transmittance was measured by dividing the width of the cross-shaped cutout portion 271 of the common electrode 270 by about 10 占 퐉 (X4).

In the second experiment example (y), the third cutout portion 281a of the common electrode 270 was formed to have a width of about 10 mu m and the cross-shaped cutout portion 271 of the common electrode 270 had a width of about 3 mu m (Y1), the width of the cross-shaped cutout portion 271 of the common electrode 270 is about 5 mu m (Y2), the width of the cross-shaped cutout portion 271 of the common electrode 270 is about The width of the cross-shaped cutout portion 271 of the common electrode 270 is about 10 mu m (Y4), and the width of the cross-shaped cutout portion 271 of the common electrode 270 is about 10 mu m (Y5) of about 15 mu m and a cross-cut portion 271 of the common electrode 270 of about 20 mu m (Y6), the transmittance was measured.

19, the width of the cross-section cutout portion 271 of the common electrode 270 is larger than the width of the third cutout portion 281a of the common electrode 270, as in the liquid crystal display device according to the embodiment of the present invention, The width of the cutout portion 271 in the shape of a cross of the common electrode 270 is W1 and the width of the third cutout portion 281a of the common electrode 270 is equal to or about twice the width of the common electrode 270, (X2, X3, X4, Y2, Y3, and Y4), as in the conventional liquid crystal display device, the pixel electrode is divided into a cross-shaped stripe portion and a stripe portion It was found that the transmittance was larger than that in the case of forming four domains (R).

As described above, in the liquid crystal display device according to the embodiment of the present invention, compared with the case where the pixel electrode 191 is formed of a plurality of fine branches to form a plurality of domains, the transmissivity is high, It is possible to prevent deterioration of display quality in the display device.

Next, a basic region of the electric field generating electrode of the liquid crystal display device according to another embodiment of the present invention will be described with reference to FIGS. 20 to 23. FIG. 20 to 23 are plan views showing a basic region of an electric field generating electrode of a liquid crystal display device according to another embodiment of the present invention.

Referring to Fig. 20, the basic region of the electric field generating electrode of the liquid crystal display device according to the present embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display device according to the embodiment shown in Fig. However, unlike the basic region of the electric field generating electrode of the liquid crystal display device according to the embodiment shown in Fig. 3, the basic region of the electric field generating electrode of the liquid crystal display device according to the present embodiment is different from the basic region of the electric field generating electrode A plurality of cutouts 91a formed by removing a part of the pixel electrode 191 are formed in a direction parallel to the direction from the respective portions where the edges meet to the central portion of the basic region of the electric field generating electrode. The plurality of cutouts 91a in the pixel electrode 191 strongly induce the arrangement direction of the liquid crystal molecules. Accordingly, the arrangement of the liquid crystal director at the edge of the basic region of the electric field generating electrode can be induced in a desired direction. That is, it is possible to guide the edge portions extending in different directions of the pixel electrodes from the respective portions where the edge portions are directed toward the center portion of the basic region of the electric field generating electrode.

21, the basic region of the electric field generating electrode of the liquid crystal display according to the present embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display according to the embodiment shown in FIG. However, unlike the basic region of the electric field generating electrode of the liquid crystal display device according to the embodiment shown in Fig. 3, the basic region of the electric field generating electrode of the liquid crystal display device according to this embodiment has the edge of the pixel electrode in different directions Specifically, the width of the pixel electrode is gradually increased from the edges of the pixel electrodes facing each other to the center of the pixel electrode, and the first angle? 1 ). Thereby, the arrangement of the liquid crystal director at the edge of the pixel region can be induced in a desired direction.

When the edge of the pixel electrode 191 is inclined so as to form a certain angle? 1 in each sub-region, the direction of alignment of the liquid crystal director at the edge of the pixel electrode 191 is also So that the liquid crystal director can be guided toward the inclined direction. Therefore, the arrangement of the liquid crystal director at the edge of the pixel region can be induced in a desired direction. That is, it is possible to guide the edge portions extending in different directions of the pixel electrodes from the respective portions where the edge portions are directed toward the center portion of the basic region of the electric field generating electrode.

Next, referring to FIG. 22, the basic region of the electric field generating electrode of the liquid crystal display device according to the present embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display device according to the embodiment shown in FIG. However, unlike the basic region of the electric field generating electrode of the liquid crystal display device according to the embodiment shown in Fig. 3, the basic region of the electric field generating electrode of the liquid crystal display device according to the present embodiment is different from the basic region of the electric field generating electrode A plurality of cutout portions 91a formed by removing a part of the pixel electrode 191 are formed in a direction parallel to the direction from the respective portions where the edges meet to the central portion of the basic region of the electric field generating electrode, The edges of the pixel electrodes are formed so as to be wider as they extend from the respective portions where the edges extending in different directions extend to the center of the pixel electrode. Specifically, the width of the pixel electrode is set so as to extend from both edges of the pixel electrode facing each other to the center portion of the pixel electrode And is formed so as to extend by the first angle [theta] 1. Thereby, the arrangement of the liquid crystal director at the edge of the pixel region can be induced in a desired direction.

Referring to Fig. 23, the basic region of the electric field generating electrode of the liquid crystal display device according to the present embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display device according to the embodiment shown in Fig. However, unlike the basic region of the electric field generating electrode of the liquid crystal display device according to the embodiment shown in Fig. 3, the basic region of the electric field generating electrode of the liquid crystal display device according to this embodiment has the edge of the pixel electrode in different directions Specifically, the pixel electrode is formed to be narrowed by the second angle (? 2) from the end of the pixel to the center of the pixel electrode. When the edge of the pixel electrode 191 is inclined so as to form a certain angle? 2 in each sub-region, the direction of alignment of the liquid crystal director at the edge of the pixel electrode 191 is also So that the liquid crystal director can be guided toward the inclined direction. Therefore, the arrangement of the liquid crystal director at the edge of the pixel region can be induced in a desired direction. That is, it is possible to guide the edge portions extending in different directions of the pixel electrodes from the respective portions where the edge portions are directed toward the center portion of the basic region of the electric field generating electrode. That is, it is possible to guide the edge portions extending in different directions of the pixel electrodes from the respective portions where the edge portions are directed toward the center portion of the basic region of the electric field generating electrode.

Next, a liquid crystal display device according to another embodiment of the present invention will be described with reference to FIG. 24 is a layout diagram of a liquid crystal display device according to another embodiment of the present invention.

Referring to FIG. 24, the liquid crystal display according to this embodiment is similar to the liquid crystal display according to the embodiment shown in FIG. However, unlike the liquid crystal display according to the embodiment shown in FIG. 1, the liquid crystal display according to this embodiment has the first sub-pixel electrode 191h and the second sub-pixel electrode 191l formed along the edge And has a cut-out portion 91. By forming the cutout 91 along the edge of the pixel electrode 191, the orientation of the liquid crystal molecules can be adjusted in a desired direction by guiding the liquid crystal director to the center of the pixel electrode at the edge of the pixel region.

In the liquid crystal display device according to this embodiment as well, the common electrode 270 has a cross-shaped first cutout portion 271a and a second cutout portion 271b, a plurality of third cutouts 281a, And has an incision portion 281b. The width of the third cutout portion 281a of the common electrode 270 is equal to or smaller than the width of the cutouts 271a and 271b of the crossed portion of the common electrode 270, The width of the cutout portions 271a and 271b may be equal to or about twice the width of the third cutout portion 281a of the common electrode 270. [ That is, if the width of the cross-sectional cutout portions 271a and 271b of the common electrode 270 is W1 and the width of the third cutout portion 281a of the common electrode 270 is W2, then W2 < 2W2 can be satisfied.

Next, the basic region of the electric field generating electrode of the liquid crystal display device according to the present embodiment will be described with reference to Fig. 25 is a plan view showing one pixel region of a liquid crystal display device according to another embodiment of the present invention.

Referring to Figure 25 (a), the basic region of the electric field generating electrode according to this embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display according to the embodiment shown in Figure 3, The pixel electrode 191 of the liquid crystal display further has a cutout 91 formed along the edge of the pixel electrode 191.

Referring to FIG. 25 (b), the basic region of the electric field generating electrode according to this embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display according to the embodiment shown in FIG. 8, The pixel electrode 191 of the liquid crystal display further has a cutout 91 formed along the edge of the pixel electrode 191.

25, the cutout portion 91 of the pixel electrode 191 is formed in a substantially quadrangular shape along the edge of the pixel electrode 191, and the cutout portion 91 of the cutout portion 271 of the common electrode 270 It is cut around the part corresponding to the end. As described above, the portion where the cut-out portion 91 formed in the pixel electrode 191 is broken serves as a connection portion of the pixel electrode. The width of the connection portion of the pixel electrode is larger than the width of the cutout portion 271 of the corresponding common electrode 270. [

The cutout portions 91 of the pixel electrodes 191 may be disposed at positions spaced apart from the edges of the pixel electrodes 191 by not more than twice the cell gap of the liquid crystal display device, And is preferably not more than twice the cell gap of the liquid crystal display device.

The basic area of the electric field generating electrode of the liquid crystal display device according to the present embodiment will be described with reference to Fig. 26 is a plan view showing one pixel region of a liquid crystal display device according to another embodiment of the present invention.

Referring to FIG. 26A, the basic region of the electric field generating electrode according to this embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display according to the embodiment shown in FIG. 3, The pixel electrode 191 of the liquid crystal display further has a cutout 91 formed along the edge of the pixel electrode 191.

Referring to Fig. 26 (b), the basic region of the electric field generating electrode according to this embodiment is similar to the basic region of the electric field generating electrode of the liquid crystal display according to the embodiment shown in Fig. 8, The pixel electrode 191 of the liquid crystal display further has a cutout 91 formed along the edge of the pixel electrode 191.

26, the cutout portions 91 of the pixel electrodes 191 are formed in a substantially quadrangular shape along the edges of the pixel electrodes 191, and the cutout portions 91 of the pixel electrodes 191 extend in different directions of the pixel electrodes 191 That is, at a portion adjacent to the corner portion of the pixel electrode 191. The edge portion of the pixel electrode 191 is connected to the edge portion. As described above, the portion where the cut-out portion 91 formed in the pixel electrode 191 is broken serves as a connection portion of the pixel electrode. The cutout portion 91 of the pixel electrode 191 partially overlaps the cutout portion 271 of the common electrode 270, unlike the embodiment shown in FIG.

The cutout portions 91 of the pixel electrodes 191 may be disposed at positions spaced apart from the edges of the pixel electrodes 191 by not more than twice the cell gap of the liquid crystal display device, And is preferably not more than twice the cell gap of the liquid crystal display device.

It is preferable that the width of the cross-shaped cutout portion 271 is about three times or less the thickness of the liquid crystal layer 3, that is, the cell interval.

The liquid crystal display according to the embodiments shown in FIGS. 24 to 26 further includes a cutout 91 formed at the edge of the pixel electrode 191. The size of the fringe field formed at the edge of the pixel electrode 191 is reduced by the cutout portion 91 so that the fringe field is formed on the common electrode 270 and is spaced apart along the edge of the pixel electrode 191 It is possible to reduce the influence of the fringe field applied to the liquid crystal molecules 31 disposed adjacent to the edge of the pixel electrode 191 as in the case of the cutouts 281a and 281b, The inclination of the arranged liquid crystal molecules 31 in the direction perpendicular to the edge of the pixel electrode 191 is controlled so that the liquid crystal molecules are tilted in the direction perpendicular to the edge of the pixel electrode 191 It is possible to prevent display quality deterioration that may occur.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Claims (45)

The first substrate,
A gate line and a data line disposed on the first substrate,
A pixel electrode disposed on the first substrate,
A second substrate facing the first substrate,
A common electrode disposed on the second substrate, and
And a liquid crystal layer disposed between the first substrate and the second substrate,
The common electrode
A first cutout portion overlapping the pixel electrode and having a cross shape,
And a second cutout portion formed in a direction parallel to the edge of the pixel electrode and formed at a position corresponding to a position spaced apart from the edge of the pixel electrode,
Wherein the second cutout portion includes a first portion parallel to the data line and a second portion parallel to the gate line,
Wherein the first portion and the second portion of the second cutout portion are formed in a liquid crystal display device
The method of claim 1,
The width of the first incision is W1, and the width of the second incision is W2, the W1 is greater than or equal to the W2.
3. The method of claim 2,
Wherein W1 and W2 satisfy W2? W1? 2W2.
3. The method of claim 2,
And at least a part of the second cutout overlaps with the data line.
5. The method of claim 4,
And an end portion of the first cutout portion protrudes from an edge of the pixel electrode when the first substrate and the second substrate are viewed from above.
The method of claim 5,
A first alignment layer formed on the first substrate,
And a second alignment film formed on the second substrate,
Wherein at least one of the liquid crystal layer, the first alignment layer, and the second alignment layer includes a photoreactive material.
The method of claim 6,
And the liquid crystal molecules of the liquid crystal layer are arranged to be perpendicular to the surfaces of the first substrate and the second substrate when no electric field is applied to the liquid crystal layer.
delete delete 8. The method of claim 7,
Wherein the pixel electrode has at least one cutout portion formed at a position where two edge portions of the edge portions of the pixel electrode extending in different directions meet with each other, And extends parallel to the direction from the point toward the central portion of the second cutout of the common electrode.
8. The method of claim 7,
Wherein the width of the pixel electrode is increased from the edge of the pixel electrode facing the pixel electrode to the center of the pixel electrode.
8. The method of claim 7,
Wherein the pixel electrode has a cutout portion adjacent to at least one of edge portions of the pixel electrode and disposed along the edge in parallel with the edge.
The method of claim 1,
And at least a part of the second cutout overlaps with the data line.
The method of claim 13,
And the edge of the first cutout protrudes from the edge of the pixel electrode when the first substrate and the second substrate are viewed from above.
12. The method of claim 11,
A first alignment layer formed on the first substrate,
And a second alignment film formed on the second substrate,
Wherein at least one of the liquid crystal layer, the first alignment layer, and the second alignment layer includes a photoreactive material.
delete delete delete The method of claim 1,
Wherein the pixel electrode includes a cutout portion in which a portion of an edge of the pixel electrode is removed, and the cutout portion extends from a point where two edges of the edge of the pixel electrode, which extend in different directions, And extends along a direction toward a central portion of the incision.
The method of claim 1,
Wherein the width of the pixel electrode is increased from the edge of the pixel electrode facing the pixel electrode to the center of the pixel electrode.
The method of claim 1,
Wherein the pixel electrode has a cutout portion adjacent to at least one of edge portions of the pixel electrode and disposed along the edge in parallel with the edge.
The method of claim 1,
And an end portion of the first cutout portion protrudes from an edge of the pixel electrode when the first substrate and the second substrate are viewed from above.
delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

Images