KR20200048181A - Liquid crystal display device of viewing angle image control - Google Patents

Abstract

The present invention relates to a liquid crystal display device that does not require separate viewing angle adjustment pixels and separate electrodes for viewing angle adjustment, prevents deterioration of transmittance and resolution, and blocks exposure of important information.
The liquid crystal display device of the present invention includes a first substrate and a second substrate; It includes a liquid crystal layer interposed between the first substrate and the second substrate, and when driving in normal mode, the liquid crystal molecules of the first pixel Pa and the second pixel Pb adjacent thereto are rearranged in the horizontal direction, and are In the mode driving, in the Nth frame N, the liquid crystal molecules of the first pixel Pa are rearranged in the horizontal direction, and the liquid crystal molecules located outside the second pixel Pb are rearranged in the vertical direction and are centered. The liquid crystal molecules located at are arranged to form a tilt angle in the vertical direction, and in the next N + 1 frame (N + 1), on the contrary, the liquid crystal molecules located outside the first pixel Pa are rearranged in the vertical direction. The liquid crystal molecules located at the center form a tilt angle in the vertical direction and rearrange, and the liquid crystal molecules of the second pixel Pb are rearranged in the horizontal direction, so that the first pixel Pa and the second frame per frame. The liquid crystal molecules of the pixel Pb are horizontal. Rearrangement, or the liquid crystal molecules located on the outside of the pixel, and is rearranged in the vertical direction of the liquid crystal molecules in the center forms a tilt angle in the vertical direction and rearranges executes the operation alternately.

Description

Viewing angle adjustment liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE OF VIEWING ANGLE IMAGE CONTROL}

The present invention relates to a liquid crystal display device, in particular, it is possible to adjust the viewing angle to block information that can be exposed to the outside through the display device, and relates to a liquid crystal display device that does not require a separate pixel and electrodes for viewing angle adjustment.

The liquid crystal display device is divided into TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In-Plane Switching) mode, and FFS (Fringe Field Switching) mode according to the alignment state of the liquid crystal molecules. In general, the TN mode liquid crystal display device has a short viewing angle, but the IPS mode liquid crystal display device has a wide viewing angle because liquid crystal molecules are horizontally moved.

However, as the side view angle is widened, the image expressed by the display device is exposed to outsiders such as the user, and thus, as important information is leaked, there is a problem that the user's privacy is infringed.

Accordingly, a technology capable of adjusting the viewing angle, such as displaying an image displayed according to a user's selection at a side viewing angle including a front viewing angle or only at a front viewing angle, such that important information or privacy-related images are not displayed at the side viewing angle It is necessary.

The object of the present invention is to solve the above problems, without requiring a separate viewing angle adjustment pixel and a separate electrode for viewing angle adjustment, to prevent the decrease in transmittance and resolution, and can block the exposure of important information It is to provide a liquid crystal display device.

In order to achieve the above object, the present invention, a first substrate and a second substrate; It includes a liquid crystal layer interposed between the first substrate and the second substrate, and when driving in normal mode, the liquid crystal molecules of the first pixel Pa and the second pixel Pb adjacent thereto are rearranged in the horizontal direction, and are In the mode driving, in the Nth frame N, the liquid crystal molecules of the first pixel Pa are rearranged in the horizontal direction, and the liquid crystal molecules located outside the second pixel Pb are rearranged in the vertical direction and are centered. The liquid crystal molecules located at are arranged to form a tilt angle in the vertical direction, and in the next N + 1 frame (N + 1), on the contrary, the liquid crystal molecules located outside the first pixel Pa are rearranged in the vertical direction. The liquid crystal molecules located at the center form a tilt angle in the vertical direction and rearrange, and the liquid crystal molecules of the second pixel Pb are rearranged in the horizontal direction, so that the first pixel Pa and the second frame per frame. The liquid crystal molecules of the pixel Pb are horizontal. Rearrangement, or the liquid crystal molecules located on the outside of the pixel, and is rearranged in the vertical direction of the liquid crystal molecules in the center forms a tilt angle in the vertical direction and rearranges provides a liquid crystal display device that performs an operation to shift.

And, when driving the privacy mode, when applying the data voltage of the image frame to the pixel, the liquid crystal molecules are rearranged in the horizontal direction, and the GDI of the GDI frame having an absolute value size smaller than the absolute value size of the highest gradation of the data voltage. When a voltage is applied to a pixel, liquid crystal molecules located outside the pixel are rearranged in the vertical direction, and the liquid crystal molecules located in the center form a tilt angle in the vertical direction to provide a liquid crystal display device rearranged.

In addition, the image frame alternately includes a data voltage having a positive potential and a data voltage having a negative potential, and the GDI frame has the positive potential of the image frame. There is provided a liquid crystal display comprising alternately a GDI voltage having a positive potential and a GDI voltage having a negative potential between a data voltage and a data voltage having a negative potential.

According to another embodiment of the present invention, when the normal mode is driven, an operation is performed to control the first pixel Pa to display an image for each frame, and to control the second pixel Pb adjacent thereto to display the image. When the mode is driven, the first pixel Pa is controlled to display an image in the Nth frame N, and the second pixel Pb causes light leakage at a side viewing angle so that the first pixel Pa is displayed The image to be displayed is controlled so as not to be displayed at a side viewing angle, and in the next N + 1 frame (N + 1), the second pixel Pb is controlled to display an image on the contrary, and the first pixel Pa is a side By causing light leakage at the viewing angle, the image displayed by the second pixel (Pb) is controlled so as not to be displayed at the side viewing angle, so that images adjacent to each frame are displayed or adjacent pixels are displayed by causing light leakage at the side viewing angle. Provides a method of driving a liquid crystal display device of the image is executed an operation of the control so that it does not appear from the side view angle alternately.

Further, when the privacy mode is driven, the operation of controlling to display the image is performed by applying a data voltage of an image frame to a pixel, and causing light leakage at the side viewing angle, so that an image displayed by an adjacent pixel is displayed at the side viewing angle. The operation of controlling not to provide the driving method of the liquid crystal display device is performed by applying the GDI voltage of the GDI frame having the absolute value size smaller than the absolute value size of the highest gradation of the data voltage to the pixel.

In addition, the image frame alternately includes a data voltage having a positive potential and a data voltage having a negative potential, and the GDI frame has the positive potential of the image frame. A method of driving a liquid crystal display device comprising alternately alternating between a data voltage and a data voltage having a negative potential, a GDI voltage having a positive potential and a GDI voltage having a negative potential. to provide.

As described above, the liquid crystal display device of the present invention can control the viewing angle according to the user's selection, thereby preventing important information from being exposed or invading the privacy of the user, and does not include a separate pixel for adjusting the viewing angle. Accordingly, it is possible to prevent a decrease in luminance and resolution. In addition, since a separate electrode provided in a pixel for adjusting a viewing angle is not required, an electric field imbalance inside the LCD panel is eliminated, thereby preventing a problem of deteriorating reliability.

1 is a diagram illustrating an arrangement state of liquid crystal molecules in an IPS mode according to an embodiment when driving a normal mode in the present invention.
2A and 2B are views illustrating an arrangement state of liquid crystal molecules in an IPS mode according to an embodiment when the privacy mode is driven in the present invention.
3 is a diagram illustrating a state in which an image is displayed for each pixel when driving the normal mode in the present invention.
4A and 4B are diagrams illustrating a state in which an image is displayed for each pixel when the privacy mode is driven in the present invention.
FIG. 5A is a diagram showing a voltage of a data signal applied to the first pixel Pa in time when driving in normal mode, and FIG. 5B is a first pixel Pa and a second pixel adjacent thereto when driving in privacy mode. It is a diagram showing the voltage of the signal applied to Pb) over time.
6 is a diagram illustrating an image displayed for each frame in the first pixel Pa and the second pixel Pb adjacent thereto when driving the normal mode and the privacy mode in the present invention.
7 is a simulation result showing the contrast ratio distribution when driving the normal mode and the privacy mode in the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

In the present invention, an operation in which the image expressed by the display device is not displayed from the side viewing angle so that the image expressed by the display device is not exposed to outsiders such as a user is defined as a “privacy mode” driving, and vice versa. An operation in which an image is displayed even in a side viewing angle because there is no privacy or invasion is defined as "normal mode" driving. The present invention can use the privacy mode or the normal mode according to the user's selection of the liquid crystal display.

1 is a diagram showing an arrangement state of a liquid crystal molecule of an IPS mode according to an embodiment when driving a normal mode in the present invention, and FIGS. 2A and 2B are of an IPS mode according to an embodiment when driving a privacy mode in the present invention It is a figure showing the arrangement state of liquid crystal molecules.

The LCD panel 100 of the liquid crystal display according to an embodiment of the present invention includes a first substrate 110 and a second substrate 120 spaced apart from each other, and the first substrate 110 and the second substrate 120 ), A liquid crystal layer 130 made of liquid crystal molecules 131, 132, and 133 is interposed.

A plurality of gate wires (not shown) configured to be spaced apart and spaced apart at predetermined intervals and data wires 141 that cross the gate wires (not shown) to define a pixel area are provided on the first substrate 110.

A thin film transistor (not shown) is formed at a crossing point between the gate line (not shown) and the data line 141, and a pixel electrode 142 and a common electrode 143 are provided in a pixel area where an image is displayed.

The thin film transistor includes a gate electrode (not shown), a gate insulating film (not shown), a semiconductor layer (not shown), and source and drain electrodes (not shown).

In addition, an insulating layer 140 is formed on the front surface of the array substrate including the thin film transistor, and a pixel electrode 142 is formed on the insulating layer to be electrically connected to the drain electrode of the thin film transistor.

In addition, a common electrode 143 is provided on one side of the pixel electrode 142 in the pixel area spaced apart at regular intervals, and the pixel electrode 142 and the common electrode 143 generate a transverse electric field therebetween to form liquid crystal molecules. The arrangement state of (131) is changed.

A black matrix 151 having openings corresponding to each pixel area is formed under the second substrate 120, and red, green, and blue are sequentially arranged corresponding to these openings under the black matrix 151. A color filter layer 150 including a color filter pattern of is formed.

In addition, an overcoat layer (not shown) is formed below the black matrix 151 and the color filter layer 150 to cover the color filter patterns having different heights to flatten the surface.

Meanwhile, a backlight unit (not shown) for supplying light to the LCD panel 100 is provided below the LCD panel 100 of the liquid crystal display device of the present invention. Depending on the type, it is divided into direct type and edge type.

The direct type backlight unit is a method in which light emitted from the light source is directly supplied to the LCD panel 100 by disposing the light source under the LCD panel 100, and the side type backlight unit is a light guide plate under the LCD panel 100. By arranging and arranging the light source on at least one side of the light guide plate, the light emitted from the light source is indirectly supplied to the LCD panel 100 by using refraction and reflection in the light guide plate.

The backlight unit of the present invention can use either of the two methods. In addition, a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode (LED) may be used as a light source, and all other devices capable of supplying light may be used.

The liquid crystal display device of the present invention is an IPS mode in which the nematic liquid crystal having positive dielectric anisotropy is rearranged in the horizontal direction by disposing both the pixel electrode 142 and the common electrode 143 on one plane. Can be.

Alternatively, the horizontal and vertical electric fields are simultaneously applied to the liquid crystal because the pixel electrode and the common electrode are in different planes with the insulating film interposed therebetween, thereby causing liquid crystal molecules around the pixel electrode that do not react to the horizontal electric field to be regenerated by the vertical electric field. It may be an FFS mode for realizing an image.

The liquid crystal display device of the present invention can use not only the IPS or FFS mode, but also a liquid crystal mode having an arrangement state of liquid crystal molecules capable of realizing a wide viewing angle.

3 is a diagram illustrating a state in which an image is displayed for each pixel when driving the normal mode in the present invention. Pixels are shown as squares, and pixels controlled to display images are shown as white.

Since the image may be displayed at a wide viewing angle when driving the normal mode of the present invention, as shown in FIG. 3, any of the first pixels Pa and the second pixels Pb adjacent thereto are used to display the images (Pa The pixels and Pb pixels are displayed in white), and the image implemented by the display device is also visible from the side viewing angle.

Since the LCD panel 100 of the present invention uses a liquid crystal mode, whether it can implement IPS mode or FFS mode, or other wide viewing angles, the user can view the image implemented by the display device from the front viewing angle, as well as from the side viewing angle. The image can be displayed to make it visible.

In particular, when a structure is applied to separate pixels in a state in which the image is controlled to display an image to adjust the viewing angle and pixels in a state in which the image is controlled not to be displayed in a side viewing angle, there is no risk of exposing the displayed image or it may be exposed. Even when the viewing angle adjustment is not required as in the case of the above, the resolution and luminance of the image implemented by the display device are lowered according to the ratio occupied by pixels in a state in which the image is not displayed at the side viewing angle among all pixels. However, in the present invention, a pixel in a state of controlling to display an image and a pixel of a state of controlling not to display an image in a side viewing angle are not distinguished, and any arbitrary first pixel Pa and adjacent second pixel Pb are both separated. Since it is used to display an image, it has a relatively high light transmittance, brightness and resolution.

As shown in FIG. 1, in the IPS mode according to an embodiment of the present invention, the liquid crystal molecules 131 of all pixels are rearranged in a horizontal direction, thereby realizing a wide viewing angle image.

4A and 4B are diagrams illustrating a state in which an image is displayed for each pixel when the privacy mode is driven in the present invention, and a pixel in a state of controlling to display an image is white, and a state in which an image is not displayed in a side viewing angle Pixels are grayed out.

When the privacy mode is driven, it is divided into a pixel in a state of controlling to display an image and a pixel in a state of controlling the image not to be displayed in a side viewing angle adjacent thereto. However, a pixel in a state of controlling to display an image and a pixel in a state of controlling the image not to be displayed at a side viewing angle adjacent thereto are not fixed, and a role is changed and driven for each frame.

That is, as shown in FIG. 4A, in an Nth frame, the first pixel Pa is controlled to display an image, and the second pixel Pb adjacent thereto is controlled to not display an image at a side viewing angle. Conversely, as shown in FIG. 4B, in the N + 1th frame, the first pixel Pa is controlled so that an image is not displayed at a side viewing angle, and the second pixel Pb is controlled to display an image. In the N + 2th frame, the first pixel Pa is controlled to display an image, and the second pixel Pb adjacent thereto is controlled to not display an image at a side viewing angle. The liquid crystal display device of the present invention alternately performs an operation of controlling each pixel to display an image and an operation of controlling an image not to be displayed at a side viewing angle every frame.

By controlling the four adjacent second pixels Pb surrounding the first pixel Pa in which the image is displayed so that the image is not displayed at the side viewing angle, the image displayed in the first pixel Pa is only visible to the user from the front viewing angle. Only visible, the image is not visible from the side viewing angle. Accordingly, it is possible to solve a problem in which the image expressed by the display device is exposed to an outsider other than the user, and thus, a significant loss of information or leakage of the user's privacy is caused.

2A and 2B, in the IPS mode according to an embodiment of the present invention, the liquid crystal molecules 131 of the pixel controlled to display an image may be rearranged in the horizontal direction to display an image, but adjacent thereto The pixels in a state in which the image is not displayed at the side viewing angle are arranged vertically with the liquid crystal molecules 132, or form a tilt angle in the vertical direction with respect to the liquid crystal molecules 133 (this is an angle that inclines the liquid crystal molecules) By causing light leakage in the side viewing angle direction, it is combined with the image displayed by the liquid crystal molecules 131 to prevent the image from being displayed at the side viewing angle.

As illustrated in FIG. 2A, the liquid crystal molecules 131 of the first pixel Pa in an arbitrary N-th frame are rearranged in a horizontal direction to display an image, and the liquid crystal molecules located outside the second pixel Pb adjacent thereto ( 132) is rearranged in the vertical direction, and by forming a tilt angle in the vertical direction with respect to the liquid crystal molecules 133 located in the center, the image is not displayed in the side viewing angle. Conversely, as illustrated in FIG. 2B, in the N + 1th frame, the liquid crystal molecules 132 located outside the first pixel Pa are rearranged in the vertical direction, and the tilt angle in the vertical direction with respect to the liquid crystal molecules 133 located in the center is oriented. By preventing the image from being displayed at the side viewing angle, the liquid crystal molecules 131 of the second pixel Pb adjacent thereto are rearranged in the horizontal direction to display the image. As shown in FIG. 2A, the liquid crystal molecules 131 of the first pixel Pa in the N + 2th frame are rearranged in the horizontal direction to display an image, and the liquid crystal molecules located outside the second pixel Pb adjacent thereto 132 is rearranged in the vertical direction, and by forming a tilt angle in the vertical direction with respect to the liquid crystal molecules 133 located at the center, the image is not displayed at the side viewing angle.

As described above, the liquid crystal display device of the present invention may control an image to be displayed or an image from a side viewing angle as each pixel alternately changes the arrangement state of the liquid crystal molecules for each frame.

In addition, in the present invention, a pixel in a state that is controlled to display an image and a pixel in a state that is controlled to not display an image in a side viewing angle are not distinguished, and an image is displayed in all pixels and an image is not displayed in a side viewing angle. Since it can operate, there is no need to provide a separate pixel and a separate electrode for preventing the image from being displayed at the side viewing angle.

Therefore, it is possible to reduce the cost of manufacturing a separate electrode for adjusting the viewing angle and simplify the process. As the electric field imbalance inside the panel, which may be caused by the separate electrode, is eliminated, the reliability of the liquid crystal display device is reduced. It has the effect of solving.

FIG. 5A is a diagram showing a voltage of a data signal applied to the first pixel Pa in time when driving in the normal mode, and FIG. 5B is a first pixel Pa and a second pixel adjacent thereto when driving in the privacy mode. It is a diagram showing the voltage of the signal applied to Pb) over time. In the drawing, the distance between each dotted line horizontally represents one frame.

The operation of displaying an image is performed by applying a data voltage to a pixel, and a frame having a data voltage is called an image frame. When the data voltage of the image frame is applied, the liquid crystal molecules 131 are rearranged in the horizontal direction to display an image.

The operation of preventing the image from being displayed at the side viewing angle is performed by applying a gray data insertion (GDI) voltage to a pixel, and a frame having a GDI voltage is called a GDI frame. The GDI voltage has an absolute magnitude smaller than the absolute magnitude of the highest gradation of the data voltage of the image frame, and preferably has a magnitude of about 20% to 50% of the data voltage of the highest gradation representing a white color. .

When the GDI voltage is applied to the pixel, as shown in FIGS. 2A and 2B, the liquid crystal molecules 133 located at the center of the pixel form a rearrangement by forming a tilt angle in the vertical direction by the applied GDI voltage, thereby causing light leakage in the side viewing angle direction. By combining with the image displayed by the liquid crystal molecules 131, the image is not displayed in the lateral direction. In addition, the liquid crystal molecules 132 located on the periphery of the pixels are rearranged in the vertical direction without forming a tilt angle due to the influence of the black matrix 151.

When driving in the normal mode, all pixels alternately input a positive image frame including a data voltage having a positive potential and a negative image frame including a data voltage having a negative potential to display an image. In addition, an image is displayed on a side viewing angle including a front viewing angle to realize a wide viewing angle.

When driving the privacy mode, if the data voltage of the image frame is applied, the data voltage of the positive image frame and the data voltage of the negative image frame are alternately applied, and when the GDI voltage of the GDI frame is applied, between the positive image frame and the negative image frame GDI voltage may be applied to the.

The GDI voltage of the GDI frame may be formed to match or reverse the sign of the data voltage and potential applied to adjacent pixels in a state of controlling to display the image. In one embodiment, FIG. 5B shows that the sign of the GDI voltage displays the image. It is shown that it is formed opposite to the sign of the data voltage applied to adjacent pixels in a controlled state. That is, when a positive data voltage is applied to a pixel in a state of controlling to display an image, a negative GDI voltage is applied to a pixel in a state of controlling the image not to be displayed in a side viewing angle adjacent thereto, When a negative (-) data voltage is applied to a pixel that is controlled to display an image, a positive GDI voltage is applied to a pixel that is controlled such that the image is not displayed at a side viewing angle adjacent thereto.

The GDI voltage itself also forms a positive (+) or negative (-) potential to change the voltage for each frame while minimizing the potential difference that may occur inside the display device. Accordingly, it has an effect of maintaining high reliability.

When driving in the privacy mode, the data voltage of the positive or negative image frame is applied to the first pixel Pa in an Nth frame to display an image, and the GDI voltage of the GDI frame is applied to the second pixel Pb adjacent thereto. This prevents the image from being displayed at the side viewing angle. Conversely, in the N + 1th frame, the first pixel Pa is applied with the GDI voltage of the GDI frame so that the image is not displayed at the side viewing angle, and the second pixel Pb is applied with the data voltage of the positive or negative image frame. Display the video. Again, in the N + 2th frame, the first pixel Pa is applied with a data voltage of a positive or negative image frame to display an image, and the second pixel Pb adjacent thereto is applied with a GDI voltage of a GDI frame, resulting in a side viewing angle. Avoid displaying images.

As described above, the liquid crystal display device of the present invention drives the privacy mode by alternately performing the operation of applying the data voltage of the positive or negative image frame to each pixel and the operation of applying the GDI voltage of the GDI frame for each frame.

6 is a diagram illustrating an image displayed for each frame in the first pixel Pa and the second pixel Pb adjacent thereto when driving the normal mode and the privacy mode in the present invention.

When driving in the normal mode, an image is displayed in all pixels and an image is displayed in front and side viewing angles.

When driving in the privacy mode, the data voltage of the positive or negative image frame is input to the first pixel Pa in an arbitrary N-th frame to display the original image when viewed from the front viewing angle. The adjacent second pixel Pb displays a gray image by causing a light leakage at the side viewing angle when the GDI voltage of the GDI frame is input, and the original image displayed in the first pixel Pa is the second pixel Pb By combining with the gray image displayed in, the image is not displayed at the side viewing angle. Conversely, in the N + 1th frame, the first pixel Pa displays the gray image by causing the light leakage at the side viewing angle by inputting the GDI voltage of the GDI frame, and the original image displayed in the second pixel Pb is removed. By combining with the gray image displayed by one pixel Pa, the image is not displayed at the side viewing angle. In addition, a data voltage of a positive or negative image frame is input to the second pixel Pb adjacent thereto to display an original image when viewed from a front viewing angle. Again, in the N + 2th frame, the first pixel Pa is input with a data voltage of a positive or negative image frame and displays an original image when viewed from a front viewing angle. The adjacent second pixel Pb displays a gray image by causing a light leakage at the side viewing angle when the GDI voltage of the GDI frame is input, and the original image displayed in the first pixel Pa is the second pixel Pb By combining with the gray image displayed in, the image is not displayed at the side viewing angle.

As described above, the liquid crystal display device of the present invention displays an original image by inputting a data voltage of a positive or negative image frame to each pixel, and inputting a GDI voltage of a GDI frame to cause light leakage at a side viewing angle, resulting in gray color. The operation of displaying the image is alternately performed for each frame, and the original image displayed by adjacent pixels is combined with the gray image so that the image is not displayed at the side viewing angle.

7 is a simulation result showing the contrast ratio distribution when driving the normal mode and the privacy mode in the present invention. Since the radius of the circle expressing the simulation result represents the viewing angle, the contrast ratio when viewed from the front viewing angle appears at the center portion of the circle, and the contrast ratio when viewed from the side viewing angle at the edge of the circle.

When driving in normal mode, it shows the highest contrast ratio at the center of the circle and the contrast ratio does not drop significantly at the edge of the circle. That is, it can be seen that the image is displayed when viewed from the side viewing angle as well as the front viewing angle, thereby having a wide viewing angle.

When driving in the privacy mode, a high contrast ratio is shown at the center of the circle, but the contrast ratio decreases toward the edge of the circle. That is, it can be seen that the image is displayed as in the normal mode at the front viewing angle, but the contrast ratio decreases as the image moves toward the side viewing angle, and the image is not displayed.

In the present invention, when the IPS mode is used, the pixel electrode 142 and the common electrode 143 are configured in a rod shape, so that the liquid crystal molecules rotate in one direction, and thus, when the viewing angle is different, a color shift phenomenon occurs. This can limit the viewing angle.

To solve this, an electrode structure forming a multi-domain that allows compensation of a phase difference of light according to a viewing angle can be used together.

In a multi-domain structure, the pixel electrode 142 and the common electrode 143 may be configured to have a slope of 45 degrees or less in contrast to the horizontal line, and may be configured to be symmetrical by bending up and down.

Accordingly, by arranging the alignment direction of the liquid crystal molecules, the phase difference compensation is performed, so that the phase value of light according to the viewing angle can obtain the same result, and the color shift phenomenon can be minimized and the viewing angle can be improved.

As described above, the present invention is not limited to the above-described embodiments, and various modifications can be carried out without departing from the gist of the present invention and not impairing the effect.

100: LCD panel 110: first substrate
120: second substrate 130: liquid crystal layer
131: horizontally arranged liquid crystal molecules 132: vertically arranged liquid crystal molecules
133: liquid crystal molecule with tilt angle 140: insulating layer
141: data wiring 142: pixel electrode
143: common electrode 150: color filter layer
151: black matrix Pa, Pb: pixel

Claims (6)

A first substrate and a second substrate;
And a liquid crystal layer interposed between the first substrate and the second substrate,
When driving the normal mode, the liquid crystal molecules of the first pixel Pa and the second pixel Pb adjacent thereto are rearranged in the horizontal direction,
When driving the privacy mode, the liquid crystal molecules of the first pixel Pa are rearranged in the horizontal direction in the Nth frame N, and the liquid crystal molecules located outside the second pixel Pb are rearranged in the vertical direction. The liquid crystal molecules located in the center form a tilt angle in the vertical direction and rearrange, and in the next N + 1 frame (N + 1), on the contrary, the liquid crystal molecules located on the outer side of the first pixel Pa are arranged in the vertical direction. The liquid crystal molecules arranged in the center are rearranged to form a tilt angle in the vertical direction, and the liquid crystal molecules of the second pixel Pb are rearranged in the horizontal direction, so that the first pixel Pa and the first agent are used for each frame. The operation in which the liquid crystal molecules of 2 pixels (Pb) are rearranged in the horizontal direction, or the liquid crystal molecules located outside the pixels are rearranged in the vertical direction, and the liquid crystal molecules located in the center form a tilt angle in the vertical direction and rearrange them. Alternating liquid crystal display device that is running in.
According to claim 1,
When driving the privacy mode,
When the data voltage of the image frame is applied to the pixel, the liquid crystal molecules are rearranged in the horizontal direction,
When the GDI voltage of the GDI frame having an absolute value size smaller than the absolute value size of the highest gradation of the data voltage is applied to the pixel, the liquid crystal molecules located outside the pixels are rearranged in the vertical direction, and the liquid crystal molecules located at the center are vertical. A liquid crystal display device that is rearranged to form a tilt angle in the direction.
According to claim 2,
The image frame alternately includes a data voltage having a positive potential and a data voltage having a negative potential,
The GDI frame is between a data voltage having a positive potential and a data voltage having a negative potential of the image frame, and a GDI voltage having a positive potential and a negative (-) voltage. A liquid crystal display device comprising alternating GDI voltages having potentials.
When driving the normal mode, an operation is performed to control the first pixel Pa to display an image for each frame, and to control the second pixel Pb adjacent thereto to display an image,
When driving in the privacy mode, the first pixel Pa is controlled to display an image in the Nth frame N, and the second pixel Pb causes light leakage at a side viewing angle, so that the first pixel Pa is The displayed image is controlled so as not to be displayed at a side viewing angle, and in the next N + 1 frame (N + 1), the second pixel Pb is controlled to display an image, and the first pixel Pa is By causing light leakage at the side viewing angle, the image displayed by the second pixel (Pb) is controlled so as not to be displayed at the side viewing angle, so that adjacent pixels are displayed for each frame, or adjacent pixels are displayed by causing light leakage at the side viewing angle. A method of driving a liquid crystal display device alternately performing an operation of controlling an image so that it is not displayed at a side viewing angle.
The method of claim 4,
When driving the privacy mode,
The operation of controlling to display the image is performed by applying a data voltage of an image frame to a pixel,
The operation of causing light leakage at the side viewing angle to control an image displayed by an adjacent pixel not to be displayed at the side viewing angle includes: GDI voltage of a GDI frame having an absolute value smaller than the absolute value of the highest gradation of the data voltage. A method of driving a liquid crystal display device that is applied and executed.
The method of claim 5,
The image frame alternately includes a data voltage having a positive potential and a data voltage having a negative potential,
The GDI frame is between a data voltage having a positive potential and a data voltage having a negative potential of the image frame, and a GDI voltage having a positive potential and a negative (-) voltage. A method of driving a liquid crystal display device comprising alternating GDI voltages having potentials.

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