KR101255309B1 - Dual view display device and method for driving the same - Google Patents

Abstract

The present invention provides a dual view display device capable of displaying different images according to a viewing angle through one screen, and a driving method thereof, including: a display panel displaying an image; A dual view mode for controlling the liquid crystal layer so that the images displayed on the display panel are separated and displayed in different directions, and a switching panel switched to the single view mode for transmitting the image displayed on the display panel as it is; The switching panel discloses a dual view display device and a driving method thereof for controlling the viewing angle by controlling the liquid crystal layer in the single view mode.

Viewing Angle, Dual View, Switching Panel, Single View, Wide Viewing Angle, Narrow Viewing Angle

Description

DUAL VIEW DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME}

1 is a cross-sectional view illustrating a dual view liquid crystal display device according to an exemplary embodiment of the present invention.

2a and 2b show the light transmission principle of the switching panel according to the present invention;

3 is a graph showing the transmission characteristics with respect to the voltage in the right viewing angle region of the switching panel according to the present invention.

4 is a diagram illustrating a dual view principle of a dual view liquid crystal display according to an exemplary embodiment of the present invention.

5A and 5B illustrate the principle of light transmission in the dual view mode of the dual view liquid crystal display according to the present invention.

6 is a view illustrating a driving principle of the single view-wide viewing angle mode of the dual view liquid crystal display according to the present invention;

7 is a view illustrating a driving principle of the single view-narrow viewing angle mode of the dual view liquid crystal display according to the present invention;

<Description of the Simple Symbols in the Drawing>

10: first lower plate 12: first lower substrate

14 thin film transistor 16 insulating film

17 common electrode 18 pixel electrode

20: first upper plate 22: first upper substrate

24: black matrix 26: color filter

30: first liquid crystal layer 40: liquid crystal panel

50: second lower plate 52: second lower substrate

54: first electrode 56: second electrode

60: second upper plate 62: second upper substrate

64: third electrode 66: fourth electrode

70 second liquid crystal layer 80 switching panel

42: first polarizing plate 43: first transmission axis

44: second polarizing plate 45: second transmission axis

46: third polarizing plate 47: transmission axis

72: liquid crystal molecules

The present invention relates to a display device of the present invention, and more particularly, to a dual view display device capable of displaying different images according to a viewing angle and a driving method thereof.

Popular flat panel display devices include liquid crystal display (LCD) using liquid crystal, plasma display panel (PDP) using discharge of inert gas, organic electroluminescent display (OLED) using organic light emitting diode, and the like. to be. Among them, the plasma display panel is applied only to a large TV, whereas the liquid crystal display and the organic electroluminescent display are applied to many fields in various sizes from small to large, such as mobile phones, portable computers, monitors, and TVs.

Herein, the liquid crystal display uses the electrical and optical characteristics of the liquid crystal. This is because liquid crystals have anisotropic properties that are different in physical property values such as refractive index and dielectric constant, and have an advantage of easily controlling molecular arrangement and optical properties. In other words, the liquid crystal display displays an image by adjusting the light transmittance by changing the arrangement direction of the liquid crystal molecules according to the electric field.

In more detail, the liquid crystal display displays an image through a liquid crystal panel in which a plurality of pixels are arranged in a matrix. Each pixel of the liquid crystal panel implements a desired color by using a combination of red, green, and blue sub-pixels that adjust light transmittance by varying a liquid crystal array according to a data signal. Each subpixel charges the data signal supplied to the pixel electrode through the thin film transistor and the difference voltage of the common voltage supplied to the common electrode to drive the liquid crystal. Since the liquid crystal panel is a non-light emitting device, the liquid crystal display includes a backlight unit for supplying light from the rear side of the liquid crystal panel.

Meanwhile, recently, in order to satisfy the needs of various users, development of a dual view liquid crystal display capable of displaying different images according to left and right viewing angles through one liquid crystal display is required. Furthermore, in some cases, a user wants not only a dual view mode but also a single view mode to view an image in an entire viewing angle area, so that a liquid crystal display device capable of switching between the dual view mode and the single view mode is required.

In addition, in single view mode, most users want a wide viewing angle, but recently, the mobile phone users require a narrow viewing angle to block people from seeing their mobile phone screen, so they switch to wide viewing angle and narrow viewing angle. What is needed is a liquid crystal display device.

The user's request may be similarly applied to not only a liquid crystal display but also other display devices such as an organic light emitting display (OLED), a field emission display (FED), and a plasma display device (PDP).

Accordingly, an aspect of the present invention is to provide a dual view display device and a driving method thereof capable of showing different images according to a viewing angle through one screen.

The present invention also provides a dual view display device capable of switching between the dual view mode and the single view mode, and a driving method thereof.

The present invention also provides a dual view display device and a driving method thereof capable of controlling the viewing angle in the single view mode.

To this end, the dual view display device according to an aspect of the present invention comprises a display panel for displaying an image; Controlling the liquid crystal layer so that the image displayed on the display panel is separated and displayed in different directions, and a switching panel switched to the single view mode for transmitting the image displayed on the display panel as it is; The switching panel adjusts the viewing angle by controlling the liquid crystal layer in the single view mode.

The display panel includes a first pixel line composed of a plurality of first pixels and a second pixel line composed of a plurality of second pixels, and the first and second pixel lines are alternately and repeatedly arranged. The switching panel has a structure in which the first region and the second region are alternately arranged, and the first and second regions have a long line shape in the same direction as the first and second pixel lines.

The switching panel drives the liquid crystal layer by a vertical electric field. Specifically, the switching panel includes first and second electrodes alternately formed side by side on the first substrate; Further comprising third and fourth electrodes alternately formed side by side on a second substrate with the liquid crystal layer interposed therebetween; The first region is controlled by the first and third electrodes and the second region is controlled by the second and fourth electrodes. The switching panel further includes two alignment layers formed on inner surfaces of each of the first and second substrates; The rubbing directions of the two alignment films are the same. The switching panel further comprises two polarizing plates formed on an outer surface of each of the first and second substrates; The two polarizing plates have a transmission axis coinciding with the rubbing direction.

The switching panel has an off mode in which the liquid crystal molecules of the liquid crystal layer are arranged side by side in a direction coinciding with the transmission axis of the polarizer by an off voltage, and the liquid crystal molecules are inclined relative to the transmission axis by an on voltage. It is controlled by the on mode driven in the erecting direction. The area controlled in the on mode of the switching panel blocks light traveling in the oblique direction from the display panel.

In the dual view mode, the display panel displays a first image by the combination of the first pixel lines and a second image by the combination of the second pixel lines, and the switching panel turns off the first region. In the mode, the second region is controlled in the on mode so that the first image is displayed as the first viewing angle region and the second image is displayed as the second viewing angle region. The switching panel switches the off mode and the on mode to the first and second regions.

In the single view mode, the display panel displays an image in a combination of the first and second pixel lines, and the switching panel controls both the first and second regions in an off mode to display the image in the display panel. It is driven in a wide viewing angle mode for transmitting the displayed image as it is.

In the single view mode, the switching panel is driven in a narrow viewing angle mode that controls both the first and second regions in an on mode so that the image displayed on the display panel is transmitted only in the front direction and blocks in the inclined direction.

The display panel is a liquid crystal panel using a liquid crystal layer. The liquid crystal layer of the liquid crystal panel is driven by a horizontal electric field. The liquid crystal molecules of the liquid crystal panel are initially oriented in a direction orthogonal to the liquid crystal molecules of the switching panel. The liquid crystal panel further includes a polarizer having a transmission axis positioned on its rear surface and orthogonal to the polarizer of the switching panel.

According to another aspect of the present invention, there is provided a driving method of a dual view display device comprising: driving in a dual view mode to separate an image displayed on a display panel in different directions; Driving in a single view-wide viewing angle mode for transmitting the image displayed on the display panel as it is; And driving in the single view-narrow viewing angle mode for transmitting the image displayed on the display panel only in the front direction and blocking in the oblique direction.

Other features and advantages of the present invention in addition to the features of the present invention will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 7. The description through the drawings is limited to the liquid crystal display device, but is not limited to the liquid crystal display device.

1 is a cross-sectional view illustrating a dual view liquid crystal display according to an exemplary embodiment of the present invention.

The dual view display device illustrated in FIG. 1 includes a liquid crystal panel 40 for displaying an image, and a switching panel 80 that switches between the single view mode and the dual view mode together with the liquid crystal panel 40. The switching panel 80 is also switched from the single view mode to the wide viewing angle mode and the narrow viewing angle mode. In addition, the dual view liquid crystal display includes a first polarizing plate 42 attached to the rear surface of the liquid crystal panel 40, a second polarizing plate 44 attached between the switching panel 80 and the liquid crystal panel 40, and a switching panel 80. It further comprises a third polarizing plate 46 attached to the front of the).

The first liquid crystal layer 30 of the liquid crystal panel 40 is driven by a horizontal electric field, and the second liquid crystal layer 70 of the switching panel 80 is driven by a vertical electric field. Here, the liquid crystal panel 40 may be driven by a vertical electric field, but for convenience of description, only the case of driving by a horizontal electric field will be described as an example.

The liquid crystal panel 40 includes a first liquid crystal layer 30 formed in a cell gap between the first upper plate 20 and the first lower plate 10 bonded by the sealing material, and the first upper plate 20 and the first lower plate 10. ) And a spacer for maintaining a cell gap between the first upper and lower plates 20 and 10.

The first lower plate 10 includes a thin film transistor array formed on the first lower insulating substrate 12. The thin film transistor array includes gate lines and data lines crossing each other insulated from each other and separating each subpixel area, thin film transistors 14 connected to the gate line and the data line to individually drive the subpixels, An insulating film 16 that protects the signal lines and the thin film transistors 14, and pixel electrodes 18 that are formed in each subpixel region and penetrate the insulating film 16 and are connected to the thin film transistors 14, respectively. ) And a common electrode 17 formed in parallel with the pixel electrode 18 to form a horizontal electric field to drive the first liquid crystal layer 30. The pixel electrodes 18 and the common electrode 17 are formed of a transparent conductive layer on the insulating layer 16.

The first top plate 20 includes a color filter array formed on the first upper insulating substrate 22. The color filter array includes a black matrix 24 that separates each subpixel region, and a red (hereinafter R), green (hereinafter G) and blue (hereinafter B) color filter 26 formed in each of the subpixel regions. Such a color filter array may be formed on the lower plate 10.

Each of the first lower plate 10 and the first upper plate 20 further includes an alignment layer that determines an initial alignment state of liquid crystal molecules constituting the first liquid crystal layer 30 on an inner surface of the first lower plate 10 and the first upper plate 20. do. The rubbing directions of the first alignment layer formed on the inner surface of the first lower plate 10 and the second alignment layer formed on the inner surface of the first upper plate 20 are perpendicular to each other. For example, the first and second alignment layers have a rubbing direction of 180 degrees. In addition, a column spacer for maintaining a cell gap may be further formed on one of the first lower plate 10 and the first upper plate 20. The first liquid crystal layer 30 is formed by a liquid crystal dropping method on any one of the substrates before the first lower plate 10 and the first upper plate 20 are bonded by the sealing material. On the other hand, the first liquid crystal layer 30 may be formed by the liquid crystal injection method after the first lower plate 10 and the first upper plate 20 are bonded together, or when the column spacer is not formed, the ball spacer may be dispersed before the liquid crystal injection. .

The liquid crystal panel 40 has a pixel matrix composed of a plurality of pixels, and the pixel matrix displays an image by adjusting the transmittance of light incident from the backlight unit. Each pixel is implemented by a combination of R, G, and B subpixels that adjust light transmittance by varying the liquid crystal array according to the data signal. Each subpixel charges the difference voltage between the data signal supplied to the pixel electrode 18 and the common voltage supplied to the common electrode 17 through the thin film transistor 14 to vary the liquid crystal array.

In detail, the pixel matrix of the liquid crystal panel 40 includes a first pixel line in which a plurality of first pixels are arranged in a vertical (column) direction, and a second pixel line in which a plurality of second pixels are arranged in a vertical direction. do. The first and second pixel lines are alternately arranged in a horizontal direction. The liquid crystal panel 40 is driven in the single view mode and the dual view mode. When the single view mode is set, data signals of one image are supplied to the first and second pixel lines of the liquid crystal panel 40. On the other hand, when the dual view mode is set, data signals of different images are supplied to the first pixel lines and the second pixel lines of the liquid crystal panel 40.

The switching panel 80 includes a second liquid crystal layer 70 formed in the cell gap between the second upper plate 60 and the second lower plate 50 bonded by the sealing material, and the second upper plate 60 and the second lower plate 50. ) And a spacer for maintaining a cell gap between the second upper and lower plates 60 and 50.

The second lower plate 50 includes a plurality of first electrodes 54 and a plurality of second electrodes 56 formed side by side on the second lower insulating substrate 52. The first electrode 54 and the second electrode 56 are alternately arranged. The upper plate 60 includes a plurality of third electrodes 64 and fourth electrodes 66 formed side by side on the second upper insulating substrate 62. The third electrode 64 and the fourth electrode 66 are alternately arranged. The first to fourth electrodes 54, 56, 64, and 66 are formed of a transparent conductive layer. The first electrode 54 overlaps the third electrode 64 with the second liquid crystal layer 70 interposed therebetween, and the second electrode 56 overlaps the fourth electrode 66. Accordingly, the first and third electrodes 54 and 64 form a vertical electric field, and the second and fourth electrodes 56 and 66 form a vertical electric field to partially or entirely turn on the second liquid crystal layer 70. Control to the off state.

In the dual view mode, the second liquid crystal layer 70 is partially controlled to be in an on state and an off state so that the image displayed on the liquid crystal panel 40 is separated into left and right viewing angle regions. For example, the common voltage is supplied to the third and fourth electrodes 64 and 66, and different voltages are supplied to the first electrode 54 and the second electrode 56, thereby allowing the first liquid crystal layer 70 to have a first voltage. And the first region driven by the third electrodes 54 and 64 and the second region driven by the second and fourth electrodes 56 and 66 are controlled to be in mutually opposite states.

In the single view mode, the second liquid crystal layer 70 controls the viewing angle by controlling the whole of the second liquid crystal layer 70 in an on state or an off state. For example, the common voltage is supplied to the third and fourth electrodes 64 and 66, and the same on or off voltage is supplied to the first and second electrodes 54 and 56. When the second liquid crystal layer 70 is turned off as a whole, a wide viewing angle mode having a wide viewing angle for transmitting the image displayed on the liquid crystal panel 40 as it is is implemented. On the other hand, when the second liquid crystal layer 70 is turned on as a whole, a narrow viewing angle mode for transmitting only the light incident to the front from the liquid crystal panel 40 and blocking the light incident in the oblique direction is implemented. Narrow-view angle mode is applied to a mobile phone or the like is used to protect the user's privacy by preventing others from viewing the user's screen.

Each of the second lower plate 50 and the second upper plate 60 may be configured to determine the initial alignment state of the liquid crystal molecules constituting the first liquid crystal layer 70 on the inner surface of the second lower plate 50 and the second liquid crystal layer 70. It further comprises a 4 alignment film. The rubbing directions of the third alignment layer formed on the inner surface of the second lower plate 50 and the fourth alignment layer formed on the inner surface of the second upper plate 60 are the same, but the rubbing directions of the first and second alignment layers of the liquid crystal panel 40 are the same. Should be orthogonal. For example, when the first and second alignment layers of the liquid crystal panel 40 have a rubbing direction of 180 degrees, the third and fourth alignment layers of the switching panel 80 have a rubbing direction of 90 degrees. In addition, a column spacer for maintaining a cell gap may be further formed on one of the second lower plate 50 and the second upper plate 60. The second liquid crystal layer 70 is formed by a liquid crystal dropping method on any one of the substrates before the second lower plate 50 and the second upper plate 60 are bonded by the sealing material. On the other hand, the second liquid crystal layer 70 may be formed by the liquid crystal injection method after the second lower plate 50 and the second upper plate 60 are bonded together, or when the column spacer is not formed, the ball spacer may be dispersed before the liquid crystal injection. .

The dual view liquid crystal display includes a first polarizing plate 42 attached to the rear surface of the liquid crystal panel 40, a second polarizing plate 44 attached between the switching panel 80 and the liquid crystal panel 40, and a switching. It further includes a third polarizing plate 46 attached to the front of the panel 80. The second and third polarizing plates 44 and 46 have the same transmission axis, and the first polarizing plate 42 has a transmission axis orthogonal to the second and third polarizing plates 44 and 46.

2A and 2B illustrate a driving principle of the switching panel shown in FIG. 1.

2A and 2B, the liquid crystal molecules 72 included in the second liquid crystal layer 70 of the switching panel 80 illustrated in FIG. 1 are 90 degrees in the rubbing direction of the third and fourth alignment layers. Are arranged in the direction. The second and third polarizing plates 44 and 46 positioned on the back and front surfaces of the switching panel 80 respectively have transmission axes 45 and 47 in the 90-degree direction corresponding to the rubbing directions of the third and fourth alignment layers. .

As shown in FIG. 2A, when the electric field is not applied, the liquid crystal molecules 72 remain in parallel with the transmission axes 45 and 47 of the second and third polarizers 44 and 46 without driving. . Accordingly, the light incident in the front direction F through the second polarizing plate 44 and the light incident in the left and right inclination directions L and R may be formed without changing the polarization state of the liquid crystal molecules 72 and the third polarizing plate 46. It passes through as it is.

On the other hand, when the electric field is applied as shown in FIG. 2B, the liquid crystal molecules 72 are driven along the vertical electric field to be 90 degrees with the transmission axes 45 and 47 of the second and third polarizing plates 44 and 46. They are arranged in a direction with an angle of inclination of less than, i.e., in an inclined direction. Accordingly, light incident in the front direction F through the second polarizing plate 44 passes through the second liquid crystal molecules 72 and the second polarizing plate 46 without changing the polarization state. However, the light incident through the second polarizing plate 44 in the left and right inclination directions L and R is phase-retarded by the liquid crystal molecules 72 which are inclined so that the polarization state changes to transmit the second polarizing plate 46. The ratio decreases. Here, the light incident in the left and right inclination directions L and R has a transmittance variable according to the voltage driving the liquid crystal molecules 72 as shown in FIG. 3. In other words, light incident in the left and right oblique directions L and R decreases as the voltage driving the liquid crystal molecules 72 increases. Therefore, when the liquid crystal molecules 72 are driven by an appropriate driving voltage, the incident light is blocked in the left and right oblique directions (L, R) to serve as a blocker in the dual view mode, and implement a narrow viewing angle mode in the single view mode. Can be.

3 is a graph illustrating transmission characteristics in a right viewing angle region according to a voltage driving the second liquid crystal layer 70 of the switching panel 80 according to the present invention.

Referring to FIG. 3, as the voltage driving the second liquid crystal layer 70 increases, the luminance (transmittance) of the right viewing angle decreases. For example, when driving the second liquid crystal layer 70 with a driving voltage in the range of 2V to 3V, the luminance is rapidly decreased in the range of 40 degrees to 80 degrees of the right viewing angle, so that the light incident in the left and right inclination directions L and R Can be blocked. Accordingly, the second liquid crystal layer 70 driven by a driving voltage in the range of 2V to 3V blocks light incident in the left and right inclination directions L and R, thereby serving as a blocking unit in the dual view mode and narrowing in the single view mode. Viewing angle mode can be implemented.

4A and 4B illustrate a driving principle of a liquid crystal panel and a switching panel according to the present invention.

Referring to FIG. 4A, the first liquid crystal molecules 32 included in the first liquid crystal layer of the liquid crystal panel are driven by a white voltage to form a second polarizing plate in the same direction as the transmission axis 43 of the first polarizing plate 42. It is driven in the same direction as the transmission shaft 45 of 44. The second liquid crystal molecules 72 included in the second liquid crystal layer of the switching panel are arranged in the same direction as the transmission axes 45 and 47 of the second and third polarizing plates 44 and 46 by the off voltage. Keep it. Accordingly, the light incident on the first polarizer 42 is changed by the first liquid crystal molecules 32 to be transmitted, thereby transmitting the second polarizer 44, and passing the second polarizer 44 through the second polarizer 44. Light incident in the front direction F through the polarizer 44 and light incident in the left and right oblique directions L and R pass through the liquid crystal molecules 72 and the third polarizer 46 without changing the polarization state. .

Referring to FIG. 4B, the first liquid crystal molecules 32 are driven by a white voltage, and the transmission axis 45 of the second polarizing plate 44 is in the same direction as the transmission axis 43 of the first polarizing plate 42. Driven in the same direction. The second liquid crystal molecules 72 are driven by the on voltage in a direction having an inclination angle of less than 90 degrees with the transmission axes 45 and 47 of the second and third polarizing plates 44 and 46, that is, in an inclined direction. . Accordingly, the light incident on the first polarizing plate 42 is changed by the first liquid crystal molecules 32 to be transmitted to pass through the second polarizing plate 44, and the front direction through the second polarizing plate 44. Light incident to (F) passes through the second liquid crystal molecules 72 and the second polarizing plate 46 without changing the polarization state. However, the light incident in the left and right inclination directions L and R through the second polarizing plate 44 is phase-delayed by the liquid crystal molecules 72 which are inclined, and the polarization state is changed so that the second polarizing plate 46 is changed. Is blocked. As a result, when the second liquid crystal molecules 72 are driven, light incident to the left and right oblique directions L and R may be blocked to serve as a blocker in the dual view mode, and a narrow viewing angle mode may be implemented in the single view mode. .

5 illustrates a dual view mode driving principle of the dual view display device according to the present invention.

In FIG. 5, the liquid crystal panel 40 and the switching panel 80 are illustrated based on the first and second liquid crystal layers 30 and 70 shown in FIG. 1. The liquid crystal panel 40 has a structure in which the first and second pixels P1 and P2 are alternately arranged in the horizontal direction, and the switching panel 80 has the first and second regions D1 and D2 in the horizontal direction. It has a structure arranged alternately. Also, in the liquid crystal panel 40, the first pixel P1 is arranged in a vertical direction together with the plurality of first pixels P1, and the second pixel P2 is perpendicular to the plurality of second pixels P2. Arranged in a direction to constitute each vertical line. Therefore, each of the first and second regions D1 and D2 of the switching panel 80 is also formed in a vertical line shape that is long in the vertical direction. The first and second regions D1 and D2 are aligned such that their boundary portions overlap with portions of each of the first and second pixels P1 and P2, for example, the central portion. Horizontal line widths of each of the first and second regions D1 and D2 are set to be the same as or different from each other, and horizontal line widths of the first and second pixels P1 and P2 are set to be the same as or different from each other. The horizontal line width of the first and second regions D1 and D2 is determined by the line widths of the first and second electrodes 54 and 64 and the line widths of the third and fourth electrodes 56 and 66 shown in FIG. 1. Is determined. Since the horizontal line widths of the first and second regions D1 and D2 are different depending on the viewing angle, they are set according to the desired viewing angle.

When the dual view mode is set, the data signal of the first image A is supplied to the first pixels P1 of the liquid crystal panel 40, and the data signal of the second image B is supplied to the second pixels P2. do. At this time, the first region D1 of the switching panel 80 is in an on (blocking) mode by the first and third electrodes 54 and 64 shown in FIG. It is driven in the off (transmission) mode by the four electrodes 56 and 66. For example, the first region D1 is in an on (blocking) mode in which an on (black) voltage having a maximum voltage difference is supplied to the first electrode 54 based on a common voltage supplied to the third electrode 64. The second region D2 is turned off (transparent) mode by supplying an off (white) voltage having a minimum voltage difference to the second electrode 56 based on the common voltage supplied to the fourth electrode 66. Is controlled. Here, the first area D1 controlled in the on (blocking) mode serves to block light incident in the left and right inclined directions. Accordingly, the first image A displayed on the first pixels P1 of the liquid crystal panel 40 passes through the second region D2 of the switching panel 80 in the right viewing angle direction and is displayed in the right viewing angle region. The second image B displayed on the second pixels P2 of the liquid crystal panel 40 passes through the second area D2 of the switching panel 80 in the left viewing angle direction and is displayed in the left viewing angle area. In other words, the first image A of the first pixels P1 positioned on the left side of the second region D2 of the switching panel 80 is positioned on the right side, and the second region located on the right side of the second region D2. By transmitting the second image B of the pixels P1 to the left side, the first and second images A and B from the liquid crystal panel 40 are separated into left and right viewing angle regions. Accordingly, the user located in the right viewing angle area can view the first image A displayed by the combination of the first pixels P1 of the liquid crystal panel 40 through the switching panel 80 and located in the left viewing angle area. The user may view the second image B displayed as a combination of the second pixels P2 of the display panel 40 through the mask filter 80.

In the dual view mode, when the first and second images A and B displayed on the left and right viewing angle regions are to be switched, the second image B is displayed on the first pixels P1 of the liquid crystal panel 40, and the second image B is displayed. The first image A may also be supplied to the pixels P2. Alternatively, the first region D1 of the switching panel 80 may be inverted in the off (transmission) mode and the second region D2 in the on (blocking) mode. In this case, the first and second images A and B displayed in the left and right viewing angle regions may be interchanged without changing the data supplied to the liquid crystal panel 40.

6 illustrates a principle of driving the single view-wide viewing angle mode of the dual view display device according to the present invention.

The liquid crystal panel 40 illustrated in FIG. 6 displays an image C in combination with the first and second pixels P1 and P2. All areas of the switching panel 80, that is, the first and second areas D1 and D2, are controlled to be in an off state so that the image C displayed on the liquid crystal panel 40 is displayed in the front direction F and the left and right inclination directions L. , R) as it is. Accordingly, the user may view the image C displayed on the liquid crystal panel 40 in the wide viewing angle mode.

7 illustrates a principle of driving the single view-narrow viewing angle mode of the dual view display device according to the present invention.

The liquid crystal panel 40 illustrated in FIG. 7 displays an image C in combination with the first and second pixels P1 and P2. The first and second regions D1 and D2 of the switching panel 80 are controlled to be turned on to transmit the image C displayed on the liquid crystal panel 40 in the front direction as it is, and to proceed in the left and right inclination directions. Blocks. Accordingly, only the user located in front of the switching panel 80 can see the image (C) displayed on the liquid crystal panel 40 in the narrow viewing angle mode, and other people located around the user can see the image displayed on the liquid crystal panel 40 ( C) can not be seen.

Meanwhile, in the present invention, only the case where the switching panel 80 is disposed on the liquid crystal panel 40 is described as an example. However, the switching panel 80 of the present invention includes a plasma display panel (PDP), an organic electroluminescent display (OLED), The same principle can be applied to a flat panel display including a field emission display (FED).

As described above, the dual view display device and the driving method thereof according to the present invention display a single image in the dual view mode and the entire viewing angle region which display different images in the left and right viewing angle regions under the control of a switching panel disposed on the display panel. It can be switched to the single view mode to satisfy the various needs of the user.

In addition, the dual view display device and the driving method thereof according to the present invention may be switched to the wide viewing angle mode and the narrow viewing angle mode by adjusting the viewing angle using the switching panel in the single view mode. Narrow-view angle mode is applied to a mobile phone, so that only the user located in front of the dual view display device can see the image displayed on the liquid crystal panel, and other people nearby can prevent privacy invasion.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (24)

A display panel displaying an image; Dual view mode in which the liquid crystal layers of the first region and the second region are controlled differently so that the image displayed on the display panel is separated and displayed in different directions, and the liquid crystal layers of the first region and the second region are the same. And a switching panel which is controlled to switch to the single view mode for transmitting the image displayed on the display panel as it is. The switching panel controls the liquid crystal layer in the single view mode to adjust a viewing angle; The switching panel is configured to control the liquid crystal layers of the first region and the second region to the same first state in the single view mode to transmit the image displayed on the display panel as it is, the first region and the first region. Controlling the liquid crystal layers of the two regions to be the same as the second state opposite to the first state so as to be switched to the narrow viewing angle mode that transmits the image displayed on the display panel only in the front direction and blocks in the inclined direction. Dual view display device. The method of claim 1, The display panel is a liquid crystal panel using a liquid crystal layer, The liquid crystal layer of the liquid crystal panel is driven by a horizontal electric field, And a liquid crystal layer of the switching panel is driven by a vertical electric field. delete The method of claim 1, The display panel A first pixel line composed of a plurality of first pixels and a second pixel line composed of a plurality of second pixels, wherein the first and second pixel lines are alternately and repeatedly arranged; The switching panel is And the first region and the second region are alternately arranged in a repeating arrangement, and the first and second regions have a long line shape in the same direction as the first and second pixel lines. Display device. delete delete The method of claim 2, The switching panel is First and second electrodes alternately formed side by side on the first substrate; Further comprising third and fourth electrodes alternately formed side by side on a second substrate with the liquid crystal layer interposed therebetween; And wherein the first area is controlled by the first and third electrodes and the second area is controlled by the second and fourth electrodes. The method of claim 7, wherein The switching panel is Further comprising two alignment films formed on inner surfaces of each of the first and second substrates; And a rubbing direction of the two alignment layers is the same. 9. The method of claim 8, The switching panel is Further comprising two polarizing plates formed on an outer surface of each of the first and second substrates; And the two polarizing plates have a transmission axis coinciding with the rubbing direction. The method of claim 9, The switching panel may include an off mode in which liquid crystal molecules of the liquid crystal layer are arranged side by side in a direction coinciding with the transmission axis of the polarizer by an off voltage; And the liquid crystal molecules are driven in an on mode driven in an inclined direction with respect to the transmission axis by an on voltage. 11. The method of claim 10, And the area controlled in the on mode of the switching panel to block light traveling in the oblique direction from the display panel. The method of claim 11, In the dual view mode, The display panel displays a first image by the combination of the first pixel lines and a second image by the combination of the second pixel lines. The switching panel controls the first area to be in the off mode and the second area to be in the on mode so that the first image is displayed in the first viewing angle area and the second image is displayed in the second viewing angle area. Dual view display device. 13. The method of claim 12, And the switching panel switches the off mode and the on mode to the first and second regions. The method of claim 11, In the single view mode, The display panel displays an image by combining the first and second pixel lines. And the switching panel is driven in the wide viewing angle mode by controlling both the first and second regions in an off mode. 15. The method of claim 14, And the switching panel is driven in the narrow viewing angle mode by controlling both the first and second regions in an on mode in the single view mode. 11. The method of claim 10, The liquid crystal molecules of the liquid crystal panel are initially aligned in a direction orthogonal to the liquid crystal molecules of the switching panel. 17. The method of claim 16, And the liquid crystal panel further comprises a polarizing plate disposed on a rear surface thereof and having a transmission axis orthogonal to the polarizing plate of the switching panel. A switching panel on the display panel is driven in a dual view mode for separating images displayed on the display panel in different directions; Driving the switching panel to a single view-wide viewing angle mode for transmitting the image displayed on the display panel as it is; And driving the switching panel in a single view-narrow viewing angle mode for transmitting the image displayed on the display panel only in the front direction and blocking in the oblique direction. The method of claim 18, The switching panel has an off mode in which the liquid crystal molecules are arranged side by side in a direction coinciding with the transmission axis of the polarizer by the off voltage; And the liquid crystal molecules are controlled in an on mode driven in a direction in which the liquid crystal molecules are inclined with respect to the transmission axis by an on voltage. 20. The method of claim 19, And the area controlled in the on mode of the switching panel to block light traveling in the oblique direction from the display panel. 20. The method of claim 19, In the dual view mode, The display panel displays a first image by a combination of first pixel lines and a second image by a combination of second pixel lines. The switching panel controls the first region to the off mode and the second region to the on mode so that the first image is displayed as the first viewing angle region and the second image is displayed as the second viewing angle region. How to drive the dual view display device. 22. The method of claim 21, And the first and second regions of the switching panel switch between the off mode and the on mode. 22. The method of claim 21, In the single view-wide viewing angle mode, The display panel displays an image by combining the first and second pixel lines. And the switching panel controls both the first and second regions in an off mode. 24. The method of claim 23, In the single view mode-narrow viewing angle mode The display panel displays an image by combining the first and second pixel lines. And the switching panel controls both the first and second regions in an on mode.

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