KR101635954B1 - Liquid crystal display - Google Patents

Abstract

The present invention relates to a liquid crystal display device. A liquid crystal display according to an embodiment of the present invention includes a first display panel including a plurality of pixel electrodes, a second display panel including a common electrode and facing the first display panel, and a second display panel facing the first display panel, And a liquid crystal layer disposed on the first display panel and including a plurality of liquid crystal molecules vertically aligned with respect to the first display panel, wherein the first display panel includes an alignment layer positioned on the pixel electrode, Wherein one of the plurality of pixel electrodes includes a first sub-pixel electrode connected to the first transistor and a second sub-pixel electrode connected to the second transistor, and the first display panel includes a first sub- A data line extending in a first direction, a gate line extending in a second direction intersecting the first direction, a sustain electrode line extending across the pixel electrode, Wherein the liquid crystal layer corresponding to at least one of the first sub-pixel electrode and the second sub-pixel electrode includes a first sub-region, a second sub-region, a third sub-region, and a drain electrode connected to the first sub- Wherein the first sub-area, the second sub-area, the third sub-area, and the fourth sub-area are divided into a first sub-area, a second sub-area, and a fourth sub-area, The electric field intensity generated by the first sub-pixel electrode and the common electrode is divided by the electric field intensity generated by the second sub-pixel electrode and the common electrode, different.

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 generate an electric field in the liquid crystal layer, thereby determining the direction of the liquid crystal molecules in the liquid crystal layer and controlling 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 view 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 or forming a projection on 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.

Also, in order to realize a wide viewing angle and to increase the response speed of the liquid crystal, a method has been developed in which the liquid crystal has a pretilt without applying an electric field. In order to make the liquid crystal have a linear gradient in various directions, it is possible to use an orientation film whose orientation direction is various or to apply an electric field to the liquid crystal layer, and then add a heat or photo-curable material, .

On the other hand, the liquid crystal display of the vertical alignment mode may be less visually perceptible than the front view. To solve this problem, a method of dividing one pixel into two sub-pixels and varying the voltages of two sub-pixels has been proposed.

Disclosure of Invention Technical Problem [8] The present invention provides a liquid crystal display device having a wide viewing angle and a fast response speed, and having excellent visibility and transmittance.

A liquid crystal display according to an embodiment of the present invention includes a first display panel including a plurality of pixel electrodes, a second display panel including a common electrode and facing the first display panel, and a second display panel facing the first display panel, And a liquid crystal layer disposed on the first display panel and including a plurality of liquid crystal molecules vertically aligned with respect to the first display panel, wherein the first display panel includes an alignment layer positioned on the pixel electrode, Wherein one of the plurality of pixel electrodes includes a first sub-pixel electrode connected to the first transistor and a second sub-pixel electrode connected to the second transistor, and the first display panel includes a first sub- A data line extending in a first direction, a gate line extending in a second direction intersecting the first direction, a sustain electrode line extending across the pixel electrode, Wherein the liquid crystal layer corresponding to at least one of the first sub-pixel electrode and the second sub-pixel electrode includes a first sub-region, a second sub-region, a third sub-region, and a drain electrode connected to the first sub- Wherein the first sub-area, the second sub-area, the third sub-area, and the fourth sub-area are divided into a first sub-area, a second sub-area, and a fourth sub-area, The electric field intensity generated by the first sub-pixel electrode and the common electrode is divided by the electric field intensity generated by the second sub-pixel electrode and the common electrode, different.

The first display panel may further include a protection layer located below the pixel electrode and including a contact hole overlapping a part of the sustain electrode line.

The drain electrode may be located under the protective film, and the contact hole may expose the drain electrode.

The drain electrode may include a first portion parallel to the gate line and a second portion parallel to the data line.

The contact hole may be positioned corresponding to a center portion of the pixel electrode.

A part of the sustain electrode line may overlap the drain electrode.

And a portion of the sustain electrode line may be positioned between the first sub-region and the second sub-region.

And a portion of the drain electrode may be located between the first sub-region and the third sub-region.

According to the present invention, it is possible to increase the aperture ratio and transmittance of a liquid crystal display device, prevent textures and crosstalk, and improve display characteristics.

1 is an equivalent circuit diagram of a pixel of a liquid crystal display according to an exemplary embodiment of the present invention,
2 is a layout diagram of a liquid crystal display device according to an embodiment of the present invention,
3 is a cross-sectional view taken along the line III-III of the liquid crystal display of FIG. 2,
FIG. 4 is a layout view of the liquid crystal display of FIG. 2 except for the pixel electrode,
5 is a plan view showing a pixel electrode of the liquid crystal display device of FIG. 2,
6 is a plan view showing a basic electrode as a basic element of a pixel electrode according to an embodiment of the present invention,
Fig. 7 is an enlarged view of a part of the basic electrode shown in Fig. 6,
8 is a diagram showing a process of making liquid crystal molecules have a linear gradient by using a prepolymer polymerized by light such as ultraviolet rays,
9, 12 and 15 are layout diagrams of a liquid crystal display device according to another embodiment of the present invention,
FIGS. 10, 13 and 16 are layouts of the liquid crystal display devices of FIGS. 9, 12 and 15, respectively, except for the pixel electrodes.
Figs. 11, 14, and 17 are plan views showing the pixel electrodes of the liquid crystal display devices of Figs. 9, 12, and 15, respectively,
18 is a plan view showing a part of a pixel electrode of a liquid crystal display device according to another embodiment of the present invention,
19 is a plan view showing a part of the pixel electrode in Fig.

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.

1 is an equivalent circuit diagram of a pixel of a liquid crystal display according to an embodiment of the present invention.

1, the liquid crystal display according to the present embodiment includes a plurality of signal lines including a plurality of gate lines GL, a plurality of data lines DLa and DLb and a plurality of sustain electrode lines SL, And a pixel PX. The liquid crystal display device includes a lower panel 100, an upper panel 200, and a liquid crystal layer 3 interposed therebetween.

Each pixel PX includes a pair of sub-pixels PXa and PXb and the sub-pixel PXa / PXb includes a switching element Qa / Qb, a liquid crystal capacitor Clca / Clcb and a storage capacitor. (Csta / Cstb).

The switching element Qa / Qb is a three-terminal element such as a thin film transistor provided in the lower panel 100. The control terminal is connected to the gate line GL and the input terminal is connected to the data line DLa / And the output terminal is connected to the liquid crystal capacitor Clca / Clcb and the storage capacitor Csta / Cstb.

The liquid crystal capacitors Clca and Clcb are formed by using the sub-pixel electrodes 191a and 191b and the common electrode 270 as two terminals and the liquid crystal layer 3 between the two terminals as a dielectric.

The storage capacitors Csta and Cstb serving as auxiliary capacitors of the liquid crystal capacitors Clca and Clcb are formed such that the sustain electrode lines SL and the sub pixel electrodes 191a and 191b provided in the lower panel 100 overlap each other with an insulator therebetween And a predetermined voltage such as the common voltage Vcom is applied to the sustain electrode lines SL.

The voltages charged in the two liquid crystal capacitors (Clca, Clcb) are set so as to slightly differ from each other. For example, the data voltage applied to the liquid crystal capacitor Clca is always set to be lower or higher than the data voltage applied to the liquid crystal capacitor Clcb. By appropriately adjusting the voltages of the two liquid crystal capacitors Clca and Clcb, the image viewed from the side can be made as close as possible to the image viewed from the front, thereby improving the lateral visibility of the liquid crystal display device.

A liquid crystal display according to an embodiment of the present invention will now be described in more detail with reference to FIGS. 2 to 5. FIG.

FIG. 2 is a layout diagram of a liquid crystal display device according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along a line III-III of the liquid crystal display device of FIG. 2, FIG. 5 is a plan view showing a pixel electrode of the liquid crystal display device of FIG. 2, FIG. 6 is a plan view showing a basic electrode of a pixel electrode according to an embodiment of the present invention, 7 is an enlarged view of a portion of the basic electrode shown in Fig.

2 and 3, a liquid crystal display according to an exemplary embodiment of the present invention includes a lower panel 100 and an upper panel 200 facing each other, and a liquid crystal layer (3).

First, the lower panel 100 will be described.

A plurality of gate lines 121 and a plurality of storage electrode lines are formed on the insulating substrate 110.

The gate line 121 transmits the gate signal and extends mainly in the horizontal direction. Each gate line 121 includes a plurality of first and second gate electrodes 124a and 124b protruding upward.

The sustain electrode line includes a stem 131 extending substantially in parallel with the gate line 121 and a plurality of branches extending therefrom. Each branch line includes a vertical portion 137, a loop portion 135, a first sustain electrode 133a, and a second sustain electrode 133b.

The vertical section 137 extends straight up and down from the stem line 131 (hereinafter, a virtual straight line in the direction in which the vertical section 137 extends is referred to as a "vertical center line").

The ring 135 is approximately rectangular and the upper side meets the vertical portion 137 vertically.

The first sustain electrode 133a extends laterally from the center of the left side of the ring 135 to the center of the right side and is wider than the vertical portion 137 or the annular portion 135. The first sustain electrode 133a and the vertical portion 137 are perpendicular to each other and meet each other.

The left side of the ring 135 extends downward and is bent to the right to form a second sustain electrode 133b. The second sustaining electrode 133b is extended in width, extends in the transverse direction, and is substantially parallel to the first sustaining electrode 133a.

However, the shape and arrangement of the sustain electrode lines 131, 133a, 133b, 135, and 137 may be modified into various forms.

A gate insulating layer 140 is formed on the gate line 121 and the storage electrode lines 131 and 133a and 133b and the storage electrode lines 133b and 135b are formed on the gate insulating layer 140. A plurality of amorphous or crystalline silicon Semiconductors 154a and 154b are formed.

A plurality of pairs of ohmic contacts 163b and 165b are formed on the semiconductor 154b and the resistive contact members 163b and 165b are formed of silicide or n + Amorphous silicon, amorphous silicon, or the like.

A plurality of pairs of data lines 171a and 171b and a plurality of pairs of first and second drain electrodes 175a and 175b are formed on the resistive contact members 163b and 165b and the gate insulating layer 140 Respectively.

The data lines 171a and 171b transmit data signals and extend mainly in the vertical direction and cross the gate lines 121 and the stem lines 131 of the sustain electrode lines. The data lines 171a / 171b include first / second source electrodes 173a / 173b extending toward the first / second gate electrodes 124a / 124b and bent in a U shape, The second source electrode 173a / 173b faces the first / second drain electrode 175a / 175b around the first / second gate electrode 124a / 124b.

The first drain electrode 175a starts from one end surrounded by the first source electrode 173a and extends upward and then is bent to the left along the upper side of the second sustain electrode 133b and extends again to the vicinity of the vertical center line It forms the other end. The other end of the first drain electrode 175a extends to the location of the second sustain electrode 133b and has a large area for connection with another layer.

The second drain electrode 175b extends from the one end surrounded by the second source electrode 173b to the vicinity of the second sustain electrode 133b and is bent to the right so that the lower side of the second sustain electrode 133b When it reaches near the vertical center line, the area becomes wider and extends again to the lower side.

However, the shapes and arrangements of the data lines 171a and 171b including the first and second drain electrodes 175a and 175b may be modified into various forms.

The first and second gate electrodes 124a and 124b and the first and second source electrodes 173a and 173b and the first and second drain electrodes 175a and 175b are connected to the first and second semiconductors 154a and 154b, And a channel of the first and second thin film transistors Qa and Qb forms a first thin film transistor (TFT) Qa and a second thin film transistor Qa / 173a / 173b and the first / second semiconductor 154a / 154b between the first and second drain electrodes 175a / 175b.

Resistive contact members 163b and 165b are present only between the underlying semiconductor layers 154a and 154b and the data lines 171a and 171b and drain electrodes 175a and 175b thereon and reduce contact resistance therebetween. Semiconductors 154a and 154b are exposed between the source electrodes 173a and 173b and the drain electrodes 175a and 175b as well as between the data lines 171a and 171b and the drain electrodes 175a and 175b.

A lower protective film 180p made of silicon nitride or silicon oxide is formed on the data lines 171a and 171b, the drain electrodes 175a and 175b and the exposed semiconductor portions 154a and 154b.

A light shielding member 220, also called a black matrix, is formed on the lower protective film 180p at predetermined intervals. The light shielding member 220 may include a rectilinear portion formed to be long in the up and down direction and a rectangular portion corresponding to the thin film transistor and to prevent light leakage.

A plurality of color filters 230 are formed on the lower protective film 180p and the light shielding member 220. The color filter 230 is mostly present in a region surrounded by the light shielding member 230. The color filter 230 is provided with a plurality of through holes 235a and 235b located on the first and second drain electrodes 175a and 175b and a plurality of apertures 235a and 235b located on the first and second sustain electrodes 133a and 133b 233a, 233b are formed. The openings 233a and 233b are for increasing the storage capacity by reducing the thickness of the dielectric forming the storage capacitors Csta and Cstb.

Here, the lower protective film 180p can prevent the pigment of the color filter 230 from flowing into the exposed portions of the semiconductors 154a and 154b.

An upper protective film 180q is formed on the light shielding member 220 and the color filter 230. [ The upper protective film 180q may be made of an inorganic insulating material such as silicon nitride or silicon oxide and may prevent the color filter 230 from being lifted and may prevent the liquid crystal layer (3) to prevent defects such as afterimages that can be caused when the screen is driven.

At least one of the light shielding member 220 and the color filter 230 may be located on the upper panel 200. In this case, one of the lower protective layer 180p and the upper protective layer 180q of the lower panel 100 may be omitted .

A plurality of contact holes 185a and 185b are formed in the upper protective film 180q and the lower protective film 180p to expose the first and second drain electrodes 175a and 175b.

A plurality of pixel electrodes 191 are formed on the upper protective film 180q and the color filter 230 described above can be extended along the column of the pixel electrodes 191. [

5, each pixel electrode 191 includes first and second sub-pixel electrodes 191a and 191b which are separated from each other with a rectangular band gap 91 therebetween, and first and second sub- Each of the two sub-pixel electrodes 191a and 191b includes at least one of the basic electrode 199 shown in FIG. 6 or a modification thereof.

The basic electrode 199 will now be described in detail with reference to FIG.

As shown in FIG. 6, the overall shape of the base electrode 199 is a rectangle, and includes a cruciform stem made up of a transverse stem 193 and a vertical stem base 192 that is orthogonal thereto. The basic electrode 199 is divided into a first sub-area Da, a second sub-area Db, a third sub-area Dc, and a fourth sub-area Dc by the transverse strike line 193 and the vertical strike line 192, And each sub-area Da-Dd includes a plurality of first to fourth fine branches 194a, 194b, 194c, and 194d.

The first fine arcuate portion 194a extends obliquely from the transverse arcuate portion 193 or the vertical arbor portion 192 in the upper left direction and the second fine arbor portion 194b extends obliquely from the transverse arcuate portion 193 or the vertical stripe portion 192, And extends obliquely from the base 192 in the upper right direction. The third fine arcuate portion 194c extends from the transverse arcuate portion 193 or the vertical arbor portion 192 in the lower left direction and the fourth fine arbor portion 194d extends from the transverse arbor portion 193 or the vertical arbor portion 192. [ And extends obliquely downward in the right-down direction from the upper side 192.

The first to fourth fine branches 194a to 194d form an angle of approximately 45 degrees or 135 degrees with respect to the gate line 121 or the transverse branch 193. Further, the fine branches 194a-194d of the neighboring two sub-regions Da-Dd may be orthogonal to each other.

The width of the fine branches 194a-194d may be between 2.5 탆 and 5.0 탆 and the spacing between neighboring fine branches 194a-194d in the one region Da-Dd may be between 2.5 탆 and 5.0 탆 have.

7, the widths of the fine branches 194a-194d are wider as they approach the transverse base 193 or the vertical bar base 192, and the widths of the fine branches 194a- The difference between the widest portion and the narrowest portion may be between 0.2 μm and 1.5 μm.

Referring again to FIGS. 2 to 5, the first sub-pixel electrode 191 a includes one basic electrode 199. The horizontal extending portion 193 of the base electrode 199 constituting the first sub-pixel electrode 191a extends upward and downward to form a first extending portion 193a and the first extending portion 193a forms a first extending portion 193a. (133a). Further, in order to facilitate contact with the first drain electrode 175a, a downward protruding portion is formed at the center of the lower side of the first extending portion 193a.

The second sub-pixel electrode 191b includes an upper electrode 191bu and a lower electrode 191bb. The upper electrode 191bu and the lower electrode 191bb each include one basic electrode 199. The upper electrode 191bu and the lower electrode 191bb are connected by two left and right connection portions 195b.

The second sub-pixel electrode 191b surrounds the first sub-pixel electrode 191a with the gap 91 interposed therebetween. A portion of the horizontal trunk portion of the lower electrode 191bb extends upward and downward to form a second extending portion 193bb and overlaps with the second sustaining electrode 133b. In order to facilitate contact with the second drain electrode 175b, a downward protruding portion is formed at the center of the lower side of the second extending portion 193bb.

The area of the second sub-pixel electrode 191b may be approximately 1.0 to 2.2 times the area of the first sub-pixel electrode 191a.

The first and second sub-pixel electrodes 191a and 191b are physically and electrically connected to the first and second drain electrodes 175a and 175b through contact holes 185a and 185b. And receives a data voltage from the electrodes 175a / 175b.

On the other hand, the upper electrode 191bu can receive the data voltage directly from the second drain electrode 175b. In this case, the second drain electrode 175b extends to the upper electrode 191bu, and further a contact hole (not shown) for contacting the upper electrode 191bu and the second drain electrode 175b is further needed. In this case, the left and right connection portions 195b are not necessary.

An alignment film 11 is formed on the pixel electrode 191.

* 109 Next, the upper display panel 200 will be described.

A common electrode 270 is formed on an insulating substrate 210, and an alignment film 21 is formed thereon.

Each of the alignment films 11 and 21 may be a vertical alignment film.

Finally, a polarizer (not shown) may be provided on the outer surface of the display panels 100 and 200.

The liquid crystal layer 3 between the lower display panel 100 and the upper display panel 200 includes liquid crystal molecules 310 and polymers 350 and 370 having a negative dielectric anisotropy.

The liquid crystal molecules 310 are aligned with the polymer 350 or 370 so that their long axes are substantially parallel to the longitudinal direction of the first to fourth fine branches 1914a to 194d of the first and second sub- And is oriented so as to be perpendicular to the surfaces of the two display panels 100 and 200. [ Therefore, each of the first and second sub-pixels PXa and PXb has four sub-areas Da-Dd having different line inclination directions of the liquid crystal.

When a gate signal is applied to the gate line 121, a data voltage is applied to the first and second sub-pixel electrodes 191a and 191b through the data lines 171a and 171b. Then, the first and second sub-pixel electrodes 191a and 191b receiving the data voltage generate an electric field in the liquid crystal layer 3 together with the common electrode 270 to which the common voltage is applied. Then, the liquid crystal molecules 310 of the liquid crystal layer 3 are oriented in a direction perpendicular to the direction of the electric field in response to the electric field. The degree of change of the polarization of the incident light to the liquid crystal layer 3 varies depending on the degree of tilting of the liquid crystal molecules 310. The change of the polarization of the liquid crystal layer 3 is caused by the change of the transmittance by the polarizer.

On the other hand, the sides of the fine arcs 194a-194d distort the electric field to produce a horizontal component perpendicular to the sides of the fine arcs 194a-194d, and the oblique directions of the liquid crystal molecules 310 are oriented in a direction . Thus, the liquid crystal molecules 310 are initially tilted in a direction perpendicular to the sides of the fine branches 194a-194d. However, since the direction of the horizontal component of the electric field due to the sides of the neighboring fine branch portions 194a-194d is opposite and the interval between the fine branch portions 194a-194d is narrow, the liquid crystal molecules 310, 194d are inclined in a direction parallel to the longitudinal direction of the fine branch portions 194a-194d. Therefore, if the liquid crystal molecules 310 are not initially tilted in the longitudinal direction of the micro branches 194a-194d as in the embodiment of the present invention, the liquid crystal molecules 310 are transferred to the micro branches 194a -194d in the longitudinal direction. However, in this embodiment, since the liquid crystal molecules 310 have already been linearly inclined in the direction parallel to the length direction of the fine branch portions 194a-194d, the liquid crystal molecules 310 are inclined in the longitudinal direction of the fine branch portions 194a- It is not inclined in the parallel direction but inclined in the direction in which the line inclination is formed at a time. Since the liquid crystal molecules 310 have a line inclination in this way, the liquid crystal molecules 310 can be tilted toward the target direction at once, thereby improving the response speed of the liquid crystal display device.

In the embodiment of the present invention, the directions in which the fine branches 194a-194d of the pixel PX extend are all four directions, and thus the directions in which the liquid crystal molecules 310 are inclined are also four directions in total. When the direction in which the liquid crystal molecules 310 are inclined is varied, the reference viewing angle of the liquid crystal display device is increased.

The first and second sub-pixel electrodes 191a and 191b and the common electrode 270 constitute liquid crystal capacitors Clca and Clcb to maintain the applied voltage even after the TFT is turned off. The first and second sustain electrodes 133a and 133b of the sustain electrode line 131 are overlapped with the first and second sub-pixel electrodes 191a and 191b and the openings 188a and 188b to be connected to the storage capacitors Csta and Cstb, .

The loop 135 of the sustain electrode line 131 overlaps with the gap 91 of the pixel electrode 191 to cover the light leakage between the first sub-pixel electrode 191a and the second sub-pixel electrode 191b shielding members. The loop 135 located between the data lines 171a and 171b and the first sub-pixel electrode 191a prevents crosstalk and reduces image deterioration.

In the structure of the pixel electrode 191 similar to the embodiment of the present invention, the directions of the liquid crystal molecules 310 are not controlled in the vicinity of the longitudinal and transverse portions of the first and second sub-pixel electrodes 191a and 191b, a texture is generated. Therefore, the sustain electrode lines 131, the vertical portions 137 of the sustain electrode lines 131, and the first and second sustain electrodes 133a and 133b are connected to the first and second sub-pixel electrodes 191a and 191b, Or by overlapping the vertical stem base, the texture can be obscured and at the same time the aperture ratio can be increased.

The first sub-pixel electrode 191a and the second sub-pixel electrode 191b receive different data voltages through different data lines 171a and 171b, respectively. The first sub-pixel electrode 191a Is higher than the voltage of the second sub-pixel electrode 191b having a relatively large area.

When the voltages of the first sub-pixel electrode 191a and the second sub-pixel electrode 191b are different from each other, a liquid crystal capacitor Clca formed between the first sub-pixel electrode 191a and the common electrode 270, Since the voltages applied to the liquid crystal capacitors Clcb formed between the pixel electrodes 191b and the common electrode 270 are different from each other, the liquid crystal molecules of the respective subpixels PXa and PXb are inclined at different angles, PXa, and PXb are different. Therefore, if the voltages of the liquid crystal capacitors Clca and Clcb are appropriately adjusted, the image viewed from the side can be made as close as possible to the image viewed from the front, that is, the side gamma curve can be made as close as possible to the front gamma curve, The visibility can be improved.

Further, when the first sub-pixel electrode 191a, which is applied with a higher voltage as in the embodiment of the present invention, is positioned at the center of the pixel PX, a portion overlapping with the gate line 121 does not overlap, And flicker phenomenon can be eliminated.

A method of initial alignment so that the liquid crystal molecules 310 have a line inclination will be described with reference to FIG.

8 is a view showing a process of making liquid crystal molecules have a linear gradient by using a prepolymer polymerized by light such as ultraviolet light.

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. The prepolymer 330 may be a reactive mesogen that undergoes a polymerization reaction by light such as ultraviolet rays.

A data voltage is applied to the first and second sub-pixel electrodes 191a and 191b and a common voltage is applied to the common electrode 270 of the upper panel 200 to form a liquid crystal layer 3 between the two display panels 100 and 200 ). ≪ / RTI > The liquid crystal molecules 310 of the liquid crystal layer 3 are tilted in a direction parallel to the longitudinal direction of the fine branch portions 194a to 194d in two steps in response to the electric field as described above, The directions in which the liquid crystal molecules 310 are inclined are four directions in total.

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 the first polymer 350 and the second polymer 370 as shown in FIG. 8 do.

The first polymer 350 is formed in the liquid crystal layer 3 and the second polymer 370 is formed in contact with the display plates 100 and 200. The orientation of the liquid crystal molecules 310 is determined by the first and second polymers 350 and 370 so that the liquid crystal molecules 310 have a line inclination in the longitudinal direction of the fine branch portions 194a to 194d.

Therefore, even when no voltage is applied to the electrodes 191 and 270, the liquid crystal molecules 310 are arranged in four different directions with a line inclination.

Next, another embodiment of the present invention will be described with reference to Figs. 9 to 11. Fig.

FIG. 9 is a layout diagram of a liquid crystal display device according to another embodiment of the present invention, FIG. 10 is a layout view of the liquid crystal display device of FIG. 9 excluding a pixel electrode, and FIG. 11 is a view showing a pixel electrode of the liquid crystal display device of FIG. FIG.

The layered structure of the liquid crystal display device according to this embodiment is generally the same as the layered structure of the liquid crystal display device shown in Figs. 2 to 5. Hereinafter, differences from the above-described embodiment will be mainly described.

9 to 11, the sustain electrode line 131 includes two vertical portions 135 extending downward from the sustain electrode lines 131 and a sustain electrode 133 protruding to the right from the vertical portion 135 on the left side. . The sustain electrode 133 is wider than the portion having a different width in order to overlap with the pixel electrode 191 to be described later.

The first drain electrode 175a extends to the upper side to form one end having a larger area and the second drain electrode 175b extends to the upper side to form one end having a larger area.

(Not shown) through which the contact holes 185a and 185b pass and an opening 233 located above the sustain electrode 133 are formed in a color filter (not shown). An upper protective film (not shown) And a lower protective film (not shown) are formed with a plurality of contact holes 185a and 185b for exposing the first and second drain electrodes 175a and 175b.

The pixel electrode 191 according to the present embodiment is also similar to the embodiment shown in Figs. 2 to 5 except that the first and second sub-pixel electrodes 191a and 191a, which are separated from each other with a rectangular- , 191b.

The first sub-pixel electrode 191a is composed of one basic electrode 199 shown in Fig. The transverse portion of the first sub-pixel electrode 191a extends upward and downward to form an extended portion 193a and the extended portion 193a overlaps the sustain electrode 133 at the opening 188 to form the storage capacitor Csta .

The second sub-pixel electrode 191b includes a base electrode 199 and a connection leg 195b surrounding the first sub-pixel electrode 191a below the gap 91.

In the lower left portion of the connection leg 195b, a portion having a large area is protruded to the right for contact with the second drain electrode 175b. As shown in FIG. 9, the second sub-pixel electrode 191b receives the data voltage from the second drain electrode 175b through the connection leg 195b.

The lower lateral side of the connection leg 195b partially overlaps with the gate line 121 to prevent the first sub-pixel electrode 191a from being affected by the gate signal of the gate line 121. [

Both longitudinal sides of the connection leg 195b cover the data lines 171a and 171b to prevent crosstalk between the data signal and the first sub-pixel electrode 191a.

The width of the connecting leg 195b may be 5.0 占 퐉 to 15 占 퐉.

The sustain electrode line 131 overlaps the gap 91 of the pixel electrode 191 and blocks light leakage between the first sub-pixel electrode 191a and the second sub-pixel electrode 191b. The left and right vertical portions 135 of the storage electrode line 131 are positioned between the first sub-pixel electrode 191a and the data lines 171a and 171b and are connected to the data lines 171a and 171b and the first sub- 191a.

The area of the second sub-pixel electrode 191b may be approximately 1.25 times to 2.75 times the area of the first sub-pixel electrode 191a.

According to the present embodiment, the first / second drain electrodes 175a / 175b are not overlapped with the second / first sub-pixel electrodes 191b / 191a to which data voltages of different polarities are applied, Even when the data voltage of the opposite polarity is applied to the first and second data lines 171a and 171b because the first and second sub-pixel electrodes 191a and 191b overlap only with the first and second sub-pixel electrodes 191a and 191b receiving the data voltage of the polarity, A texture due to the electric field distortion does not occur around the two drain electrodes 175a and 175b. Therefore, according to this embodiment, the texture can be prevented and the transmittance can be increased.

According to the present embodiment, the contact holes 185a and 185b are located at the edges or corners of the first and second subpixels PXa and PXb rather than in the middle thereof, and a color filter (not shown) The process can be made easier.

The viewing angle of the liquid crystal display device can be increased with the inclination direction of the liquid crystal molecules in the four directions as in the embodiment described above and the liquid crystal molecules have a linear inclination through the polymerization process of the whole polymer The response speed can be improved. In addition, different data voltages may be applied to the first and second sub-pixel electrodes 191a and 191b to improve lateral visibility.

Next, another embodiment of the present invention will be described with reference to Figs. 12 to 14. Fig.

12 is a layout diagram of a liquid crystal display device according to another embodiment of the present invention, FIG. 13 is a layout view of the liquid crystal display device of FIG. 12 excluding a pixel electrode, and FIG. 14 is a cross- FIG.

The liquid crystal display device according to the present embodiment is mostly the same as the liquid crystal display device shown in Figs. 9 to 11. Hereinafter, differences from the above-described embodiment will be mainly described.

Referring to FIGS. 12 to 14, the first drain electrode 175a for transmitting the data voltage to the first sub-pixel electrode 191a has a wide end portion at the lower right corner of the first sub-pixel PXa And is electrically and physically connected to the first sub-pixel electrode 191a through the contact hole 185a. Therefore, when a color filter (not shown) is formed by an inkjet process, the process can be made easier and the transmittance can be increased.

Also, in this embodiment, since the sustain electrodes and the openings are not provided for forming the storage capacitors Csta and Cstb, the aperture ratio can be made larger.

Next, another embodiment of the present invention will be described with reference to FIG. 15 to FIG.

15 is a layout diagram of a liquid crystal display device according to another embodiment of the present invention, FIG. 16 is a layout view of the liquid crystal display device of FIG. 15 excluding a pixel electrode, and FIG. 17 is a cross- FIG.

The layered structure of the liquid crystal display device according to this embodiment is generally the same as the layered structure of the liquid crystal display device shown in Figs. 2 to 5. Hereinafter, differences from the above-described embodiment will be mainly described.

15 to 17, the storage electrode line 131 includes two vertical portions 135 extending upward and downward from the storage electrode line 131, a horizontal connection portion 132 connecting the two vertical portions, and a horizontal connection portion 132) having a large area protruding downward substantially from the center thereof.

(Not shown) through which the contact holes 185a and 185b pass and an opening 233 located above the sustain electrode 133 are formed in a color filter (not shown). An upper protective film (not shown) And a lower protective film (not shown) are formed with a plurality of contact holes 185a and 185b for exposing the first and second drain electrodes 175a and 175b.

The pixel electrode 191 includes first and second sub-pixel electrodes 191a and 191b which are separated from each other with a rectangular band-shaped gap 91 interposed therebetween.

The second sub-pixel electrode 191b includes an upper electrode 191bu and a lower electrode 191bb. The upper electrode 191bu and the lower electrode 191bb are connected to each other by two left and right connection portions 195b.

The two vertical portions of the sustain electrode line 131 overlap the gap 91 to block the light leakage between the first sub-pixel electrode 191a and the second sub-pixel electrode 191b, and the first sub-pixel electrode 191a and the data line 171a, 171b. In addition, the horizontal connection portion 132 of the sustain electrode line 131 covers the texture around the horizontal stripe portion 193a of the first sub-pixel electrode 191a to increase the aperture ratio.

2 to 5, the horizontal line portion 193bu of the upper electrode 191bu is not located at the center of the upper electrode 191bu but is located at the upper edge, and the lower electrode 191bb Is located at the lower edge of the lower electrode 191bb. Therefore, two of the four sub-areas Da-Dd of the basic electrode 199 of FIG. 6 in the upper and lower electrodes 191bu and 191bb are almost disappeared and remain as a dummy. However, since the sub-region Da-Dd in the four directions still exist in the second sub-pixel electrode 191b, the direction of the liquid crystal molecules 310 can be variously changed.

In this case, the width of the remaining two sub-regions Dc and Dd of the upper electrode 191bu may be 1.5 times or more the width of the two sub-regions Da and Db. The width of the remaining two sub-regions Da and Db of the lower electrode 191bb may be at least 1.5 times the width of the two sub-regions Dc and Dd.

The upper and lower portions Dc and Db of the lower electrode 191bb of the upper electrode 191bu or the lower electrode 191bb of the lower electrode 191bu may have a width of about 5 mu m.

The opening ratio and the transmittance are increased by overlapping the smaller two regions (Da-Dd) of the upper or lower electrodes 191bu and 191bb with the gate line 121 in the form of a dummy as in the present embodiment, , And 193bb.

The reason why the sub-area (Da-Dd) that has almost disappeared and remains as a pile is left without being removed will be described with reference to FIGS. 18 and 19. FIG.

FIG. 18 is a plan view showing a part of a pixel electrode of a liquid crystal display device according to another embodiment of the present invention, and FIG. 19 is a plan view showing a part of the pixel electrode of FIG.

As shown in FIG. 18, if the two regions Da and Db of the upper electrode 191bu are completely removed, a fringe field is generated in the direction D1 perpendicular to the upper edge of the upper electrode 191bu. A disclination DL of the liquid crystal molecules 310 is generated between the inclined direction D2 of the liquid crystal molecules 310 of the two sub-regions Dc and Dd and the direction D1 of the fringe field Textures will be created.

19, if the two sub-regions Da and Db are left in a dummy form on the upper electrode 191bu, the liquid crystal molecules 310 are inclined in the direction D1 as shown in Fig. 19, The liquid crystal molecules 310 of the liquid crystal molecules Dc and Dd have the same horizontal direction, so that the texture can be weakened.

Instead of placing the horizontal line portions 193bu and 193bb of the upper or lower electrodes 191bu and 191bb of the second sub-pixel electrode 191b at the upper or lower edge of the pixel PX as in the present embodiment, The vertical line portions 192bu and 192bb of the upper and lower electrodes 191bu and 191bb of the pixel electrode 191b are positioned at the right edge or the left edge of the pixel PX to form the left side regions Da and Dc, (Db, Dd) can be caused to vary. In this case, the width of the widened sub-area Da-Dd may be 1.5 times or more the width of the narrowed sub-area Da-Dd.

According to this embodiment, unlike the embodiment shown in FIGS. 2 to 5, the horizontal stripe portion 193a of the first sub-pixel electrode 191a does not have an extended portion, but instead a portion of the lower vertical stripe portion 192a And is formed as a first enlarged portion 192a. A portion having a large area for contact with the first drain electrode 175a is formed under the first extension 192a and a portion having a large area for contact with the second drain electrode 175b is formed under the second extension 192a. And is formed at the center of the lower vertical line base portion 192bb of the lower electrode 191bb of the sub-pixel electrode 191b.

The viewing angle of the liquid crystal display device can be increased with the inclination direction of the liquid crystal molecules in the four directions as in the embodiment described above and the liquid crystal molecules have a linear inclination through the polymerization process of the whole polymer The response speed can be improved. In addition, different data voltages may be applied to the first and second sub-pixel electrodes 191a and 191b to improve lateral visibility.

Unlike the embodiment of the present invention, by irradiating light such as ultraviolet rays obliquely to the alignment films 11 and 21 by means of forming a plurality of sub-areas Da-Dd having different directions of the liquid crystal molecules 310, An optical alignment method of controlling the alignment direction and the alignment angle of the molecules 310 can be used. It is not necessary to form the fine branch portions 194a-194d of the pixel electrode 191, so that the aperture ratio can be increased and the response time can be improved by the line inclination of the liquid crystal molecules 310 generated in the photo alignment .

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.

3: liquid crystal layer 11, 21: alignment layer
310: liquid crystal molecule 100: thin film transistor display panel
110, 210: insulating substrate 121: gate line
124a, 124b: gate electrode 131: sustain electrode line
133: sustain electrode 135:
140: gate insulating film 154a, 154b: semiconductor
163b, 165b: resistive contact member
171a and 171b: data lines 173a and 173b: source electrodes
175a and 175b: drain electrodes 180p and 180q:
185a 185b: Contact holes 233, 233a, 233b Openings
191: pixel electrode 200: common electrode panel
220: a light shielding member 230: a color filter
270: common electrode

Claims (18)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete A first display panel including a plurality of pixel electrodes, a data line extending in a first direction, a gate line extending in a second direction intersecting the first direction, and a sustain electrode line extending across the pixel electrode,
A second display panel including a common electrode and facing the first display panel, and
And a liquid crystal layer disposed between the first display panel and the second display panel and including a plurality of liquid crystal molecules vertically aligned with respect to the first display panel,
/ RTI >
Wherein the first display panel includes an alignment layer positioned on the pixel electrode,
Wherein the alignment film is irradiated with light to form a linear gradient of the liquid crystal molecules,
Wherein one of the plurality of pixel electrodes includes a first sub-pixel electrode connected to the first transistor and a second sub-pixel electrode connected to the second transistor,
And a connection leg connected to the second sub-pixel electrode and surrounding the first sub-pixel electrode together with the second sub-pixel electrode,
Wherein a part of the connection leg is connected to the second transistor,
The liquid crystal layer corresponding to the first sub-pixel electrode and the liquid crystal layer corresponding to the second sub-pixel electrode are divided into a first sub-region, a second sub-region, a third sub-region, and a fourth sub-
Wherein each of the first sub-area, the second sub-area, the third sub-area, and the fourth sub-area is divided by a tilting direction of the liquid crystal molecules when a voltage is applied to the pixel electrodes,
The electric field intensity generated by the first sub-pixel electrode and the common electrode is different from the electric field intensity generated by the second sub-pixel electrode and the common electrode
Liquid crystal display device. 16. The method of claim 15,
Wherein the first display panel further includes a protective layer located below the pixel electrode and including a contact hole overlapping a part of the sustain electrode line. 17. The method of claim 16,
Wherein the first transistor or the second transistor includes a drain electrode positioned under the protective film,
The contact hole is formed to overlap with the drain electrode
Liquid crystal display device. 16. The method of claim 15,
And the sustain electrode line includes a portion overlapping an area between the first sub-pixel electrode and the second sub-pixel electrode.

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