KR101386567B1 - Liquide crystal display device and method for driving the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a driving method thereof. In particular, a liquid crystal display device capable of obtaining sufficient luminance when driving a wide viewing angle mode in a liquid crystal display device capable of selecting and driving a wide viewing angle mode or a narrow viewing angle mode, and It relates to a driving method. The present invention, the first substrate and the second substrate; A plurality of gate lines and a first data line intersecting longitudinally and horizontally on the first substrate to define a plurality of first to fourth subpixels; At least one driving element formed in each of the first to fourth subpixels; First and second electrodes disposed on the first substrate of each of the first to fourth subpixels to form a horizontal electric field; Third and fourth electrodes formed on the first substrate and the second substrate of the fourth subpixel to face each other to form a vertical electric field; And a liquid crystal layer formed between the first substrate and the second substrate. Lt; / RTI >

LCD, viewing angle, luminance

Description

Liquid crystal display and its driving method {LIQUIDE CRYSTAL DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME}

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

FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.

FIG. 3 is a cross-sectional view illustrating a state when the liquid crystal display of FIG. 1 is driven in a narrow viewing angle mode. FIG.

FIG. 4 is a cross-sectional view illustrating a state when the liquid crystal display of FIG. 1 is driven in a wide viewing angle mode. FIG.

5 is a plan view showing a liquid crystal display device according to an exemplary embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along a line II-II ′ of FIG. 5.

FIG. 7 is a cross-sectional view illustrating a state when the liquid crystal display of FIG. 5 is driven in the narrow viewing angle mode. FIG.

FIG. 8 is a cross-sectional view illustrating a state when the liquid crystal display of FIG. 5 is driven in a wide viewing angle mode. FIG.

DESCRIPTION OF REFERENCE NUMERALS

101: first substrate 102: second substrate

103: gate line 104: first data line

105: second data line 116: liquid crystal

106: first thin film transistor 108: second thin film transistor

109: first electrode 112: second electrode

111: third electrode 114: fourth electrode

Pr: Red Subpixel Pg: Green Subpixel

Pb: Blue subpixel Pv: Subpixel for viewing angle control

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device capable of driving by selecting a wide viewing angle mode or a narrow viewing angle mode, and more particularly, to a liquid crystal display device and a driving method thereof capable of obtaining sufficient luminance in a wide viewing angle mode. .

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

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

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

The liquid crystal display device having such a configuration includes an electrically controlled bireringence (ECB) mode, a vertical alignment (VA) mode, a twisted nematic (TN) mode, and an IPS (depending on the arrangement of liquid crystals and the arrangement of electrodes for applying an electric field to the liquid crystals). in plain switching mode).

In the ECB mode liquid crystal display, the initial alignment of the liquid crystal is arranged in parallel with the substrate, and electrodes are formed on the upper and lower substrates, respectively, to apply a vertical electric field to the liquid crystal. The substrate is arranged perpendicular to the substrate, and electrodes are formed on the upper and lower substrates, respectively, to apply a vertical electric field to the liquid crystal. The TN mode liquid crystal display is arranged such that the initial orientation of the liquid crystal is twisted spirally while proceeding from the bottom to the top. The electrodes are formed on the upper and lower substrates to apply a vertical electric field to the liquid crystal. In the liquid crystal display of the IPS mode, the initial alignment of the liquid crystal is arranged horizontally on the substrate, and electrodes are formed on the lower substrate to apply a horizontal electric field to the liquid crystal.

As described above, among the various types of liquid crystal display devices, the liquid crystal display device of the ECB mode has a narrow viewing angle due to leakage of light in the direction of the inclined left and right viewing angles. The change in birefringence is small, and the viewing angle is wide. In particular, the IPS mode liquid crystal display device has a tendency of increasing its use due to the wide viewing angle.

On the other hand, the wide viewing angle of the IPS mode liquid crystal display means that if you use the computer for personal reasons, you may be invaded of privacy by people who are adjacent to the liquid crystal display in use, or you may perform confidential tasks using the computer. In some cases this can lead to dysfunction, such as the risk of leakage of confidential content.

In order to solve this security problem, the liquid crystal display further includes a subpixel for viewing angle control selectively implementing the ECB mode and the off mode in addition to the red, green, and blue subpixels that implement the IPS mode. Proposed.

As described above with reference to FIGS. 1 to 4 attached to the liquid crystal display device having a subpixel for controlling the viewing angle as described above.

As shown in Figs. 1 and 2, the liquid crystal display device according to the prior art includes: a first substrate 1 and a second substrate 2; A gate line (3) and a data line (4) intersecting longitudinally and horizontally on the first substrate (1) to define red, green, blue, viewing angle control subpixels (Pr, Pg, Pb, Pv); A thin film transistor (5) formed in the red, green, blue, and viewing angle control subpixels (Pr, Pg, Pb, and Pv) and formed in an intersection region of the gate line (3) and the data line (4); A first pixel electrode 6 and a first common electrode 7 formed to be alternately spaced apart from each other by the red, green, and blue subpixels Pr, Pg, and Pb; A second pixel electrode 8 and a second common electrode 9 which are alternately spaced apart from each other by a predetermined interval in the viewing angle control subpixel Pv; .

The liquid crystal display device having such a configuration selects and drives the narrow viewing angle mode or the wide viewing angle mode as necessary.

In more detail, as shown in FIG. 3, when driving in the narrow viewing angle mode, the thin film transistors 5 of the red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv are all red. The horizontal electric field is applied to the liquid crystals 16 of the green and blue subpixels Pr, Pg, and Pb, and the vertical electric field is applied to the liquid crystal 16 of the subpixel Pv for viewing angle control. Accordingly, in the direction of the inclined viewing angle, light is leaked to implement a narrow viewing angle mode in which the screen is not observed.

As shown in FIG. 4, the thin film transistors 5 of the red, green, and blue subpixels Pr, Pg, and Pb are driven when driving in the wide viewing angle mode, and the thin film transistors of the subpixel Pv for viewing angle control are driven. By not driving 5, a horizontal electric field is formed only in the red, green, and blue subpixels Pr, Pg, and Pb. As described above, when the red, green, and blue subpixels Pr, Pg, and Pb are driven and the viewing angle control subpixel Pv is not driven, it is the same as driving a liquid crystal display device in the IPS mode, thereby realizing a wide viewing angle. .

However, the liquid crystal display device has an advantage of implementing a narrow viewing angle mode, whereas the sub-pixel Pv for controlling the viewing angle is not driven when driving in the wide viewing angle mode, compared to the general IPS mode liquid crystal display device. Since the aperture ratio is relatively small, the brightness of the screen is reduced.

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to include a pixel electrode and a common electrode for driving an IPS mode and an ECB mode in a viewing angle control subpixel. It provides a liquid crystal display device and a driving method thereof which can compensate for the lack of luminance by driving the control subpixel in the ECB mode to use the viewing angle control function, and when driving the wide viewing angle mode in the IPS mode. will be.

According to an aspect of the present invention, a liquid crystal display device includes: a first substrate and a second substrate; A plurality of gate lines and a first data line intersecting longitudinally and horizontally on the first substrate to define a plurality of first to fourth subpixels; At least one driving element formed in each of the first to fourth subpixels; First and second electrodes disposed on the first substrate of each of the first to fourth subpixels to form a horizontal electric field; Third and fourth electrodes formed on the first substrate and the second substrate of the fourth subpixel to face each other to form a vertical electric field; And a liquid crystal layer formed between the first substrate and the second substrate, wherein a horizontal electric field is formed by the first and second electrodes formed on the first to third subpixels, and formed on the fourth subpixel. When the vertical electric field is formed by the third electrode and the fourth electrode, the narrow viewing angle mode is implemented. When the horizontal electric field is formed by the first electrode and the second electrode formed on the first to fourth subpixels, the wide viewing angle is realized. It is characterized by.

In addition, the driving method of the liquid crystal display device according to the embodiment of the present invention for achieving the above object, the first substrate and the second substrate, and the first to the first and second crossings on the first substrate in the longitudinal direction A plurality of gate lines and first data lines defining four subpixels, second data lines connected to each of the fourth subpixels, and intersections of the gate lines and the first data lines formed in first to fourth subpixels; A first thin film transistor formed in a region, a second thin film transistor formed in a fourth subpixel and formed at an intersection of the gate line and the first data line, and on a first substrate of each of the first to fourth subpixels. A first electrode and a second electrode disposed substantially parallel to each other to form a horizontal electric field, and the first and second substrates of the fourth subpixel to face each other. The method comprising: providing a liquid crystal display device configured by a liquid crystal layer formed between the castle third electrode and the fourth electrode and the first substrate and the second substrate; Simultaneously driving the first thin film transistor formed on the first to third subpixels and the second thin film transistor formed on the fourth subpixel to drive in the first mode; Simultaneously driving the first thin film transistors formed in the first to fourth subpixels in a second mode; .

Hereinafter, a liquid crystal display and a driving method thereof according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a liquid crystal display according to an exemplary embodiment of the present invention will be described.

5 and 6, a liquid crystal display according to an exemplary embodiment of the present invention includes a first substrate 101 and a second substrate 102; A plurality of gate lines (103) and first data lines (104) intersecting longitudinally and horizontally on the first substrate (101) to define a plurality of first to fourth subpixels (Pr, Pg, Pb, Pv); At least one driving element (106, 108) formed in each of the first to fourth subpixels (Pr, Pg, Pb, and Pv); The first electrode 109 and the second electrode 112 disposed on the first substrate 101 of each of the first to fourth subpixels Pr, Pg, Pb, and Pv to form a horizontal electric field. ); A third electrode 111 and a fourth electrode 114 formed on the first substrate 101 and the second substrate 101 of the fourth subpixel Pv to form a vertical electric field; And a liquid crystal layer formed between the first substrate 101 and the second substrate 102. And a control unit. The first to fourth subpixels Pr, Pg, Pb, and Pv are red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv. In the liquid crystal display according to the exemplary embodiment of the present invention, a second data line 105 connected to each of the fourth subpixels Pv is further formed. In addition, the driving elements 106 and 108 formed in the first to fourth subpixels according to the exemplary embodiment of the present invention are formed in the first to fourth subpixels Pr, Pg, Pb, and Pv, and the gate A first thin film transistor 106 formed at an intersection of the line 103 and the first data line 104; And a second thin film transistor 108 formed in the fourth subpixel Pr, Pg, Pb, and Pv and formed at an intersection of the gate line 103 and the second data line 105. .

Hereinafter, the components of the liquid crystal display according to the exemplary embodiment of the present invention having such a configuration will be described in detail.

The first substrate 101 is a thin film transistor array substrate as a lower substrate of the liquid crystal panel, and the second substrate 102 is a color filter array substrate as an upper substrate of the liquid crystal panel, and the first substrate 101 and the second substrate are The liquid crystal layer is formed between the substrates 102.

Gate lines 103 and first and second data lines 104 and 105 intersecting vertically and horizontally are arranged on the first substrate 101, and gate lines 103 and first and second data lines 104, Red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv are formed in an area where 105 crosses each other. Here, the red, green, and blue subpixels Pr, Pg, and Pb are connected to the first data line 104, and the viewing angle control subpixel Pv is connected to the first data line 104 and the second data. Lines 105 are all connected.

The second substrate 102 has a red color filter (not shown) in an area corresponding to the red subpixel Pr, and a green color filter (not shown) in an area corresponding to a green subpixel Pg. The blue color filter 118 is formed in an area corresponding to the blue subpixel Pb, and the color filter is not formed in an area corresponding to the subpixel Pv for viewing angle control. However, a third electrode 114 is formed on the second substrate 102 in a region corresponding to the viewing angle control subpixel Pv. Detailed description thereof will be given below.

A gate insulating layer 115 is formed between the gate line 103 and the first and second data lines 104 and 105 as shown in FIG. 6. That is, the gate line 103 overlaps the first and second data lines 104 and 105 with the gate insulating layer 115 interposed therebetween. In addition, a passivation layer 117 is formed on the first and second data lines 104 and 105.

As illustrated in FIG. 5, a first thin film transistor 106 is formed in the red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv of the first substrate 101.

The first thin film transistor 106 is formed in an area where the gate line 103 and the first data line 104 cross each other. The drain terminal of the first thin film transistor 106 is connected to the first electrode 109 through the first contact hole 120, and the source terminal of the first thin film transistor 106 is connected to the first data line 104. Branch from the gate line 103.

In addition, as illustrated in FIG. 5, a second thin film transistor 108 is formed in the viewing angle control subpixel Pv of the first substrate 101 in addition to the first thin film transistor 106.

The second thin film transistor 108 is formed in a region where the gate line 103 and the second data line 105 cross each other. The drain terminal of the second thin film transistor 108 is connected to the third electrode 111 through the second contact hole 122, the source terminal is branched from the second data line 105, and the gate terminal is a gate line. Branching from 103 is performed.

As shown in FIGS. 5 and 6, a plurality of first electrodes 109 and second electrodes 112 are branched into the red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv. They are staggered apart from each other by a predetermined interval. Here, the first electrode 109 is a pixel electrode and the second electrode 112 is a common electrode.

The first electrode 109 and the second electrode 112 are formed in a direction parallel to the first and second data lines 104 and 105 so as to cross each other, and the first electrode 109 is connected to the first contact. The hole 120 is connected to the drain terminal of the first thin film transistor 106 and the second electrode 112 is connected to the common line 125 through the third contact hole 123. Here, the common line 125 is branched from the common voltage line (not shown) and formed in parallel with the gate line 103.

When an appropriate voltage is applied to the first electrode 109 and the second electrode 112, a horizontal electric field is formed, and the liquid crystals 116 are horizontally arranged parallel to the electric field by the horizontal electric field. That is, the liquid crystal 116 is driven as in the liquid crystal display of the IPS mode by the horizontal electric field formed by the first electrode 109 and the second electrode 112.

In the accompanying drawings, the first electrode 109 and the second electrode 112 are formed in a plurality of branches and have a plurality of bent shapes, but the present invention is not limited thereto. The two electrodes 112 can have various shapes such as straight lines within the scope of the present invention.

In addition, a third electrode 111 and a fourth electrode 114 are formed in the viewing angle control subpixel Pv so as to face each other on the first substrate 101 and the second substrate 102. The third electrode 111 is a pixel electrode and the fourth electrode 114 is a common electrode.

The third electrode 111 is widely formed under the first electrode 109 and the second electrode 112 formed on the first substrate 101 of the sub-pixel Pv for viewing angle control, and has a second contact hole ( 122 is connected to the drain terminal of the second thin film transistor 108. The fourth electrode 114 is formed on the second substrate 102 of the sub-pixel Pv for viewing angle control, and is formed to face the third electrode 111 so as to face the fourth contact hole. Is connected to the common line 125.

When an appropriate voltage is applied to the third electrode 111 and the fourth electrode 114, a vertical electric field is formed, and the liquid crystal 116 is parallel to the electric field by the vertical electric field, that is, with respect to the first substrate 101. It is arranged to be inclined. That is, the liquid crystal 116 is driven as in the liquid crystal display of the ECB mode by the vertical electric field of the third electrode 111 and the fourth electrode 114.

The liquid crystal display device including the components described above can be driven by selecting a narrow viewing angle mode or a wide viewing angle mode as necessary, which will be described below with reference to FIGS. 7 and 8.

As shown in FIG. 7 and FIG. 8, the driving method of the liquid crystal display according to the present invention crosses the first substrate 101 and the second substrate 102 vertically and horizontally on the first substrate 101. A second gate line 103 and a first data line 104 defining a plurality of first to fourth subpixels Pr, Pg, Pb, and Pv, and a second connected to each of the fourth subpixels Pv A first thin film transistor formed on the data line 105 and the first to fourth subpixels Pr, Pg, Pb, and Pv, and formed at an intersection of the gate line 103 and the first data line 104. 106, a second thin film transistor 108 formed at a fourth subpixel Pv and formed at an intersection of the gate line 103 and the second data line 105, and the first to fourth subpixels. (Pr, Pg, Pb, Pv) and the first electrode 109 and the second electrode 112 which is disposed substantially parallel to each of the first substrate 101 to form a horizontal electric field, and the fourth A third electrode 111 and a fourth electrode 114 formed on the first substrate 101 and the second substrate 102 of the pixel Pv to form a vertical electric field, and the first substrate ( Providing a liquid crystal display device comprising a liquid crystal layer formed between the 101 and the second substrate (102); The first thin film transistor 106 formed in the first to third subpixels Pr, Pg, and Pb and the second thin film transistor 108 formed in the fourth subpixel Pv are simultaneously driven to drive in the first mode. Making; Simultaneously driving the first thin film transistors 106 formed in the first to fourth subpixels Pr, Pg, Pb, and Pv to drive in a second mode; . In this case, the first mode is the narrow viewing angle mode, and the second mode is the wide viewing angle mode.

The driving method of the liquid crystal display device according to the present invention is not limited to the driving order, and the driving order may be appropriately changed and applied within a range not departing from the gist of the present invention. That is, since the narrow viewing angle mode as the first mode and the wide viewing angle mode as the second mode can be selectively implemented according to a user's needs, the driving method of the liquid crystal display according to the present invention is not limited to the driving order.

FIG. 7 is a cross-sectional view illustrating a state in which the liquid crystal display of FIG. 5 is driven in the narrow viewing angle mode. Hereinafter, an example of driving the liquid crystal display according to the present invention in the narrow viewing angle mode will be described in detail. .

As shown in FIG. 7, when the liquid crystal display according to the present invention is driven in the narrow viewing angle mode, the red, green, and blue subpixels Pr, Pg, and Pb are driven by the first thin film transistor 106. A horizontal electric field is formed by the electrode 109 and the second electrode 112, whereby the liquid crystals 116 are arranged horizontally parallel to the electric field.

When the liquid crystal display according to the present invention is driven in the narrow viewing angle mode, the second thin film transistor 108 is driven to the third electrode 111 and the fourth electrode 114 to control the viewing angle control subpixel Pv. Thereby forming a vertical electric field, whereby the liquid crystals 116 are arranged parallel to the electric field, ie, inclined with respect to the first substrate 101. Here, when driving in the narrow viewing angle mode, the first thin film transistor 106 is not driven so that a voltage for implementing black is applied to the first electrode 109 or no voltage is applied to the subpixel Pv for the viewing angle control mode. .

Accordingly, since the liquid crystals 116 of the viewing angle control subpixel Pv are arranged to be inclined with respect to the first substrate 101, light leaks in the direction of the inclined left and right viewing angles. Accordingly, the liquid crystal display device is driven in the narrow viewing angle mode, and the user of the liquid crystal display device may perform computer work while maintaining security.

FIG. 8 is a cross-sectional view illustrating a state in which the liquid crystal display of FIG. 5 is driven in the wide viewing angle mode. Referring to this example, an example of driving the liquid crystal display according to the present invention in the wide viewing angle mode will be described in detail. .

As shown in FIG. 8, when the liquid crystal display according to the present invention is driven in the wide viewing angle mode, the red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv include the first thin film transistor 106. Are both driven to form a horizontal electric field by the first electrode 109 and the second electrode 112, thereby arranging the liquid crystals 116 to be parallel to the electric field. Here, when driving in the wide viewing angle mode, the second thin film transistor 108 is not driven in the viewing angle control subpixel Pv so that a voltage for implementing black or the voltage is not applied to the second electrode 111. .

Accordingly, the liquid crystals 116 of the red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv are arranged in parallel with the first substrate 101. That is, since the liquid crystals 116 of the red, green, blue, and viewing angle control subpixels Pr, Pg, Pb, and Pv are all driven as in the case of driving the liquid crystal display of the IPS mode, light leaks in the inclined left and right viewing angle directions. It doesn't work. Accordingly, the liquid crystal display is driven in the wide viewing angle mode. In addition, since the light emitted from the backlight is emitted as white light having no color through the viewing angle control subpixel Pv, to compensate for the insufficient luminance, which is a disadvantage of the liquid crystal display market equipped with the viewing angle control subpixel Pv. It is effective. Accordingly, the user of the liquid crystal display can observe the screen of the bright brightness.

As described above, the liquid crystal display according to the present invention includes a pixel electrode and a common electrode for driving the IPS mode and the ECB mode in the viewing angle control subpixel, so that the viewing angle control subpixel is the ECB when the narrow viewing angle mode is driven. By driving in the mode, the viewing angle control function is used, and when the wide viewing angle mode is driven, the lack of luminance can be compensated by driving the viewing angle control subpixel in the IPS mode.

Accordingly, the narrow viewing angle mode and the wide viewing angle mode may be selectively driven as needed, and the screen display quality of the liquid crystal display may be increased.

Claims (17)

A first substrate and a second substrate; A plurality of gate lines and a first data line intersecting longitudinally and horizontally on the first substrate to define a plurality of first to fourth subpixels; At least one driving element formed in each of the first to fourth subpixels; First and second electrodes arranged in parallel on a first substrate of each of the first to fourth subpixels to form a horizontal electric field; Third and fourth electrodes formed on the first substrate and the second substrate of the fourth subpixel to face each other to form a vertical electric field; And A liquid crystal layer formed between the first substrate and the second substrate; And, When the horizontal electric field is formed by the first electrode and the second electrode formed in the first to third subpixels, and the vertical electric field is formed by the third electrode and the fourth electrode formed in the fourth subpixel, the narrow viewing angle mode is implemented. And a wide field of view when a horizontal electric field is formed by the first electrode and the second electrode formed in the first to fourth subpixels. The liquid crystal display of claim 1, wherein each of the first to fourth subpixels is a red, green, blue, and viewing angle control subpixel. The liquid crystal display of claim 1, further comprising a second data line connected to each of the fourth subpixels. The liquid crystal display of claim 1, wherein the first electrode is a pixel electrode, and the second electrode is a common electrode. The liquid crystal display of claim 1, wherein the third electrode is a pixel electrode, and the fourth electrode is a common electrode. delete delete 4. The driving device of claim 3, wherein the driving elements formed in the first to fourth subpixels include: First thin film transistors formed on first to fourth subpixels and formed at intersections of the gate lines and the first data lines; And A second thin film transistor formed on a fourth subpixel and formed at an intersection of the gate line and the second data line; Liquid crystal display comprising a. The liquid crystal display of claim 8, wherein the drain terminal of the first thin film transistor is connected to a first electrode. The liquid crystal display of claim 8, wherein the source terminal of the first thin film transistor is connected to a first data line. The liquid crystal display of claim 8, wherein the drain terminal of the second thin film transistor is connected to a third electrode. The liquid crystal display of claim 8, wherein the source terminal of the second thin film transistor is connected to a second data line. 9. The liquid crystal display device according to claim 8, wherein the first thin film transistors formed in the first to third subpixels and the second thin film transistors formed in the fourth subpixel are simultaneously driven to realize a narrow viewing angle. The liquid crystal display of claim 8, wherein the first thin film transistors formed in the first to fourth subpixels are simultaneously driven to realize a wide viewing angle. A first substrate and a second substrate, a plurality of gate lines and first data lines crossing the first substrate in a longitudinal direction and defining a plurality of first to fourth subpixels, and connected to each of the fourth subpixels. A first thin film transistor formed at a second data line, first to fourth subpixels, and formed at an intersection of the gate line and the first data line, and formed at a fourth subpixel and formed of the gate line and the second data line. A second thin film transistor formed at an intersection region, a first electrode and a second electrode arranged in parallel on a first substrate of each of the first to fourth subpixels to form a horizontal electric field, and a fourth subpixel A liquid crystal table including a third electrode and a fourth electrode formed on the first substrate and the second substrate to face each other to form a vertical electric field, and a liquid crystal layer formed between the first substrate and the second substrate Providing a market value; Simultaneously driving the first thin film transistor formed on the first to third subpixels and the second thin film transistor formed on the fourth subpixel to drive in the first mode; Simultaneously driving the first thin film transistors formed in the first to fourth subpixels in a second mode; Method of driving a liquid crystal display device comprising a. 16. The method of claim 15, wherein the first mode is a narrow viewing angle mode. 16. The method of claim 15, wherein the second mode is a wide viewing angle mode.

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