TWI427605B - Liquid crystal display - Google Patents

Description

Liquid crystal display device

The present invention relates to a liquid crystal display (LCD) and a driving method thereof, and more particularly to a liquid crystal display device with adjustable viewing angle and a driving method thereof.

The great advancement of the multimedia society has mostly benefited from the breakthrough progress of semiconductor components or display devices. In terms of display devices, Thin Film Transistor Liquid Crystal Display (TFT-LCD), which has superior image quality, good space utilization efficiency, low power consumption, and no radiation, has gradually become the mainstream of the market. .

The consumer market requires a stylish appearance for the liquid crystal display device as well as being light, thin, short, and small for easy portability. In addition, performance requirements for liquid crystal display devices are toward high contrast ratio, no gray scale inversion, low color shift, high luminance, and high color richness. Degree, high color saturation, fast response and wide viewing angle. At present, technologies capable of achieving wide viewing angles include twisted nematic (TN) liquid crystals, wide viewing film, in-plane switching (IPS) liquid crystal display devices, and marginal fields. A fringe field switching (FFS) liquid crystal display device and a multi-domain vertical alignment (MVA) liquid crystal display device.

In the multi-domain vertical alignment type liquid crystal display device, there are protrusions or slits on the color filter substrate or the thin film transistor array substrate, so that the liquid crystal molecules are arranged in multiple directions, and thus several numbers can be obtained. Different alignment domains to achieve a wide viewing angle. In this way, the user can face up or squint the display.

However, since the display device is easy to carry, the consumer often carries the liquid crystal display device to go out and frequently uses it in public places. When consumers read private letters or materials in public places, it is inevitable that private information will be leaked by outsiders.

The invention provides a liquid crystal display device with a side viewing angle interference function.

The present invention further provides a driving method of a liquid crystal display device, which is suitable for driving the liquid crystal display device in a side viewing angle interference mode.

The liquid crystal display device of the present invention comprises a first substrate, a second substrate and a liquid crystal layer. The first substrate has a plurality of first switches, a plurality of first wires, a plurality of second wires, a plurality of pixel electrodes, a plurality of second switches, and a control electrode. Each pixel electrode is electrically connected to the corresponding first switch. Each of the first switches is driven by the corresponding first wiring to turn on or off the corresponding second wiring and the corresponding pixel electrode. Each of the second switches is electrically connected to the control electrode and the corresponding pixel electrode. The second substrate has a common electrode. The liquid crystal layer is disposed between the first substrate and the second substrate. In a normal mode, each of the second switches opens the control electrode and the corresponding pixel electrode. In the side view interference mode, each of the second switches turns on the control electrode and the corresponding pixel electrode.

In an embodiment of the liquid crystal display device, the pixel electrode and the control electrode are located in different film layers.

In an embodiment of the liquid crystal display device, the pixel electrode and the control electrode are located in the same film layer.

In an embodiment of the liquid crystal display device, the first substrate further has a third wiring. Each of the second switches is driven by the third wiring to turn on or off the control electrode and the corresponding pixel electrode.

In an embodiment of the liquid crystal display device, a third switch is further included to electrically connect the control electrode and the common electrode. In the normal mode, the third switch turns on the control electrode and the common electrode. In the side view interference mode, the third switch turns off the control electrode and the common electrode.

In an embodiment of the liquid crystal display device, the liquid crystal layer is a positive liquid crystal layer.

In an embodiment of the liquid crystal display device, a backlight module is further included, and the first substrate, the second substrate, and the liquid crystal layer are disposed on the backlight module.

In an embodiment of the liquid crystal display device, the two alignment films and the two polarizers are further included. The alignment films are disposed on the surfaces of the first substrate and the second substrate adjacent to the liquid crystal layer, respectively. The polarizers are respectively disposed on the surfaces of the first substrate and the second substrate away from the liquid crystal layer. These alignment films horizontally align the liquid crystal layers and have substantially parallel alignment directions. The light transmission axes of the polarizers are perpendicular to each other, and the light transmission axis of at least one of the polarizers is perpendicular to the alignment direction of the alignment film.

The driving method of the present invention is applied to the aforementioned liquid crystal display device. The driving method alternately drives the liquid crystal display device in a normal mode in a first sub-frame time and drives the liquid crystal display device in a side viewing angle interference mode in a second sub-frame time.

In an embodiment of the driving method, the liquid crystal display device further includes a backlight module, and includes, in each first sub-frame time, the control electrode and the pixel electrode are disconnected, and the first switch is batch driven to The second wiring writes a plurality of display potentials to the corresponding pixel electrodes, and writes a common potential to the control electrodes; and after the liquid crystal molecules of the liquid crystal layer are driven by the electric field to rotate to the positioning, the backlight module is lit.

In an embodiment of the driving method, the liquid crystal display device further includes a backlight module, and includes, in each second sub-frame time, turning on the control electrode and the pixel electrode to write an interference potential into the control electrode and drawing And a common electrode is written to the common electrode; and after the liquid crystal molecules of the liquid crystal layer are driven by the electric field and rotated to the position, the backlight module is lit. The common potential may be a direct current common potential or an alternating current common potential.

In an embodiment of the driving method, the control electrode and the common electrode are turned on in the normal mode, and the control electrode and the common electrode are turned off in the side view interference mode.

In an embodiment of the driving method, the time length of each first sub-frame time is less than the time length of each second sub-frame time.

In summary, the liquid crystal display device and the driving method thereof of the present invention have a side viewing angle interference mode, and can achieve side viewing angle interference without reducing the light utilization rate and resolution to protect user privacy.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

1 is a partial cross-sectional view showing a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the liquid crystal display device of FIG. 1. Referring to FIG. 1 and FIG. 2 , the liquid crystal display device 100 of the present embodiment includes a first substrate 110 , a second substrate 120 , and a liquid crystal layer 130 . The first substrate 110 has a plurality of first switches S10, a plurality of first wirings L10, a plurality of second wirings L20, a plurality of pixel electrodes P10, a plurality of second switches S20, and a control electrode P20. The second substrate 120 has a common electrode P30. The liquid crystal layer 130 is disposed between the first substrate 10 and the second substrate 120. The liquid crystal layer 130 can adopt a positive liquid crystal material, that is, the liquid crystal molecules of the liquid crystal layer 130 have a parallel dielectric constant greater than a vertical dielectric constant, and thus the long axis of the positive liquid crystal molecules will be parallel to the electric field direction when subjected to an electric field.

In Fig. 1, only a single pixel electrode P10 is depicted, but this pixel electrode P10 is divided into a plurality of portions separated from each other due to the relationship of the position of the cross section. In FIG. 2, only one first switch S10, two first wirings L10, two second wirings L20, and one second switch S20 are depicted.

Referring to FIG. 1 and FIG. 2, each pixel electrode P10 is electrically connected to the corresponding first switch S10. In this embodiment, the first switch S10 is exemplified by a thin film transistor, but is not intended to limit the invention. Each of the first switches S10 is driven by the corresponding first wiring L10 to turn on or off the corresponding second wiring L20 and the corresponding pixel electrode P10. That is, when the first wiring L10 inputs a high level potential signal to turn on the first switch S10, the display potential transmitted by the second wiring L20 can be written to the pixel electrode P10 via the first switch S10. Each of the second switches S20 is electrically connected to the control electrode P20 and the corresponding pixel electrode P10.

In addition, the liquid crystal display device 100 of the present embodiment may further include two alignment films 142 and 144 and two polarizers 152 and 154. The alignment films 142 and 144 are disposed on the surfaces of the first substrate 110 and the second substrate 120 near the liquid crystal layer 130, respectively. The polarizers 152 and 154 are respectively disposed on the surfaces of the first substrate 110 and the second substrate 120 away from the liquid crystal layer 130. The alignment films 142 and 144 horizontally align the liquid crystal layer 130, and the alignment directions of the alignment films 142 and 144 are substantially parallel to each other. The light transmission axes of the polarizers 152 and 154 are perpendicular to each other, and the light transmission axis of the polarizer 152 or the polarizer 154 is perpendicular to the alignment direction of the alignment films 142 and 144. As shown in FIG. 1, when the liquid crystal layer 130 is not driven by an electric field, the liquid crystal molecules of the entire liquid crystal layer 130 are horizontally arranged in a substantially parallel manner to each other. Therefore, the linearly polarized light passing through the polarizer 152 is not deflected by the action of the liquid crystal layer 130, and the final light will not pass through the polarizer 154.

3 and FIG. 4 are partial cross-sectional views showing the liquid crystal display device of FIG. 1 driven in a normal mode and a side viewing angle interference mode, respectively. Referring to FIG. 2 and FIG. 3, when the liquid crystal display device 100 is driven in the normal mode, each of the second switches S20 turns off the control electrode P20 and the corresponding pixel electrode P10. At this time, each of the pixel electrodes P10 writes the display potential corresponding to the gray scale value to be displayed, and the control electrode P20 writes the common potential. Thereby, a fringe electric field is generated between the control electrode P20 and the pixel electrode P10, and the generated fringe electric field is simply indicated by the power line E10 in FIG. Since the long axis of the liquid crystal molecules of the liquid crystal layer 130 of the present embodiment is parallel to the direction of the electric field, the long axis of the liquid crystal molecules in the liquid crystal layer 130 close to the first substrate 110 will be substantially perpendicular to the liquid crystal molecules close to the second substrate 120. Long axis. In other words, the linearly polarized light passing through the polarizer 152 is subjected to the action of the liquid crystal layer 130 to deflect the polarization direction, and the degree of deflection determines the amount of light passing through the polarizer 154 to achieve the purpose of displaying various gray scale values. When a color filter film (not shown) is disposed on the first substrate 110 or the second substrate 120, or the light entering the liquid crystal display device 100 itself is colored light, the liquid crystal display device 100 can display a color image.

Referring to FIG. 2 and FIG. 4, when the liquid crystal display device 100 is driven in the side viewing angle interference mode, each of the second switches S20 turns on the control electrode P20 and the corresponding pixel electrode P10. At this time, the control electrode P20 and all the pixel electrodes P10 are written with the same interference potential, and the interference potential can correspond to a specific gray scale value, which can be changed according to design requirements. The common electrode P30 writes a common potential to generate a vertical electric field between the common electrode P30 and the control electrode P20 and all of the pixel electrodes P10, and the generated vertical electric field is simply indicated by the power line E20 in FIG. Since the long axis of the liquid crystal molecules of the liquid crystal layer 130 of the present embodiment is parallel to the direction of the electric field, the long axes of all the liquid crystal molecules of the liquid crystal layer 130 will be substantially perpendicular to the first substrate 110 and the second substrate 120.

Fig. 5 is a perspective view showing the liquid crystal molecules in the liquid crystal display device of Fig. 4 being poured. At this time, the polarization direction of the light of the liquid crystal display device 100 is not deflected by the action of the liquid crystal layer 130, so that the user of the liquid crystal display device 100 does not see any light passing through the liquid crystal display device 100. . It is to be noted that since the long axis of the liquid crystal molecules of the liquid crystal layer 130 is not completely perpendicular to the first substrate 110, the polarization direction of the light obliquely incident on the liquid crystal display device 100 is still deflected by the action of the liquid crystal layer 130, resulting in The user who views the liquid crystal display device 100 from the side view from the side will see the light passing through the liquid crystal display device 100.

In other words, the user in the forward viewing direction only sees the normal screen displayed by the liquid crystal display device 100 driven in the normal mode. However, the user in the side viewing direction direction can see the interference screen displayed by the liquid crystal display device 100 driven in the side viewing angle interference mode in addition to the normal screen displayed by the liquid crystal display device 100 driven in the normal mode. Therefore, the person who is peeping from the side will be seen to join the combination of the normal picture and the interference picture, instead of the simple normal picture at the time of the front view. In this way, it is possible to prevent others from being peeked at the user's private information, and the user's privacy is protected.

Since the liquid crystal display device 100 of the present embodiment displays in all areas in the normal mode in which the normal screen is displayed, instead of retaining the specific area display interference screen, the liquid crystal display device 100 of the present embodiment can reduce the aperture ratio and light without reducing the aperture ratio. The purpose of side view interference is achieved under the condition of utilization and resolution. In the meantime, the liquid crystal display device 100 of the present embodiment can be used by the user to select whether to activate the side view interference mode or only to drive in the normal mode, and the picture quality displayed by the liquid crystal display device 100 in the normal mode is generally free from side view interference. The function of the liquid crystal display device displays the same picture quality.

Referring to FIG. 1 again, the pixel electrode P10 and the control electrode P20 of the embodiment are exemplified by different film layers, and the two are separated by an insulating layer 112. The operation of the liquid crystal molecules is similar to the marginal field in the prior art. Switch mode. However, referring to FIG. 6, the pixel electrode P12 of the liquid crystal display device 102 and the control electrode P22 are located in the same film layer, and the operation of the liquid crystal molecules is similar to the marginal field switching mode in the prior art. However, the liquid crystal display device 102 has the advantages of being able to freely switch between the normal mode and the side view interference mode, the high aperture ratio, the high light utilization rate, and the high resolution, like the liquid crystal display device 100 of FIG.

Referring to FIG. 1 and FIG. 2 again, in the liquid crystal display device 100 of the embodiment, the first substrate 110 may further have a third wiring L30. The second switch S20 is exemplified by a thin film transistor, but is not intended to limit the present invention. This third wiring L30 connects the gates of all the second switches S20 to simultaneously drive all of the second switches S20 to turn on or off the control electrode P20 and all of the pixel electrodes P10. However, the second switch S20 may be another type of switch without being driven by the third wiring L30. In addition, a storage capacitor C _st may be formed between the control electrode P20 and the pixel electrode P10, and a liquid crystal capacitor C _LC may be formed between the common electrode P30 and the pixel electrode P10.

In addition, the liquid crystal display device 100 of the present embodiment may further include a third switch S30 electrically connected to the control electrode P20 and the common electrode P30. Since the control electrode P20 and the common electrode P30 are both single electrodes, the entire liquid crystal display device 100 only needs one third switch S30 to determine the conduction or disconnection between the control electrode P20 and the common electrode P30. When the liquid crystal display device 100 is driven in the normal mode, the third switch S30 turns on the control electrode P20 and the common electrode P30. At this time, the liquid crystal molecules of the liquid crystal layer 130 are mainly driven by the fringe electric field between the control electrode P20 and the pixel electrode P10, and the common potential of the common electrode P30 can shield external electromagnetic interference. However, when the liquid crystal display device 100 is driven in the normal mode, the common electrode P30 may be selected to be in a floating state. The influence of the electric field between the common electrode P30 and the pixel electrode P10 on the liquid crystal layer 130 can be compensated by adjusting the level of the display potential written in the pixel electrode P10. In the side view interference mode, the third switch S30 must turn off the control electrode P20 and the common electrode P30 to generate a vertical electric field between the common electrode P30 and the control electrode P20 and all of the pixel electrodes P10.

Figure 7 is a top plan view of a single pixel electrode of the liquid crystal display device of Figure 1. Referring to FIG. 3 and FIG. 7, a plurality of slits SLIT may be formed on the pixel electrode P10 to generate a fringe electric field between the control electrode P20 and the pixel electrode P10 as shown in FIG. An acute angle may be formed between the extending direction of the slit SLIT and the alignment direction D10 of the alignment film 142. In Fig. 7, the alignment state of the liquid crystal molecules due to the alignment effect when the liquid crystal molecules are not driven by the electric field is indicated by a solid line, and the deflection tendency of the liquid crystal molecules when driven by the electric field is indicated by a broken line. When a fringe electric field is generated between the control electrode P20 and the pixel electrode P10, the liquid crystal molecules are driven by the electric field to cause deflection. Meanwhile, since the extending direction of the slit SLIT is not perpendicular to the alignment direction D10 of the alignment film 142, most of the liquid crystal molecules will be deflected in the same direction. Thereby, it is possible to prevent the deflection directions of the liquid crystal molecules from being inconsistent and to lower the display quality. In addition, the extending directions of the slits SLIT located above and below the pixel electrodes P10 may be different from each other to generate different alignment regions above and below the pixel electrodes P10 to achieve a wide viewing angle effect.

In an embodiment of the liquid crystal display device, a backlight module is further included, and the first substrate, the second substrate, and the liquid crystal layer are disposed on the backlight module.

FIG. 8 is a modified exploded view of the liquid crystal display device of FIG. 1. FIG. Referring to FIG. 8 and FIG. 1 , the liquid crystal display device 104 includes a backlight module 160 in addition to the components of the liquid crystal display device 100 illustrated in FIG. 1 . The first substrate 110, the second substrate 120, the liquid crystal layer 130, and other members of the liquid crystal display device 100 are disposed above the backlight module 160. The backlight module 160 is configured to provide light to enter the first substrate 110, the second substrate 120, the liquid crystal layer 130, and other components. However, if the liquid crystal display device 100 is a reflective liquid crystal display device that uses external light, the backlight module 160 is not required. In addition, the liquid crystal display device 104 further has a front frame 170 for more stably arranging the first substrate 110, the second substrate 120, the liquid crystal layer 130 and other components on the backlight module 160.

FIG. 9 is a timing diagram of a driving method according to an embodiment of the present invention. Referring to FIG. 9, the driving method of the present embodiment is applied to the foregoing embodiments or other liquid crystal display devices according to the features of the present invention, and the liquid crystal display device 104 of FIG. 8 is taken as an example. A frame time Ft can be divided into a first sub-frame time F10 and a second sub-frame time F20. The driving method of the embodiment drives the liquid crystal display device 104 in a normal mode in a first sub-frame time F10, and drives the liquid crystal display device 104 in a side viewing angle interference mode in a second sub-frame time F20, and A sub-frame time F10 and a second sub-frame time F20 are alternately ordered. In other words, the driving method of this embodiment displays the normal picture in the first sub-frame time F10, and allows the user of the positive view to not see the interference picture in the second sub-frame time F20, but in the second sub-picture In the frame time F20, the side viewer of the side view is seen to see the interference picture to achieve the purpose of side view interference. However, it is known that a liquid crystal display device having a side viewing angle interference function simultaneously displays a normal picture and an interference picture in the same picture frame time. Therefore, the conventional driving method must sacrifice a part of the display area of the liquid crystal display device to provide an interference picture, and the driving method of the present embodiment can use the entire display area of the liquid crystal display device 104 to provide a normal picture. Thereby, the driving method of the present embodiment can achieve the purpose of side viewing angle interference without reducing the aperture ratio, the light utilization rate, and the resolution.

Referring to FIG. 1 , FIG. 2 , FIG. 8 and FIG. 9 , for example, in the period F12 of the first sub-frame time F10 , the control electrode P20 and the pixel electrode P10 may be disconnected first, and the batch drive first. The switch S10 writes a plurality of display potentials to the corresponding pixel electrodes P10 from the second wirings L20, and writes a common potential to the control electrodes P20, as described in the foregoing embodiment when the liquid crystal display device 100 is driven in the normal mode. . Next, in the period F14 of the first sub-frame time F10, the liquid crystal molecules of the liquid crystal layer 130 are driven by the electric field to be rotated to the position. Finally, the backlight module 160 is illuminated in the period F16 of the first sub-frame time F10, so that the user can only see the display screen in the best state, so as to avoid the occurrence of image sticking or smear in the screen.

Similarly, in the period F22 of the second sub-frame time F20, the control electrode P20 and the pixel electrode P10 may be turned on first, and an interference potential is written into the control electrode P20 and the pixel electrode P10, and a common potential is written. The common electrode P30 is as described in the foregoing embodiment when the liquid crystal display device 100 is driven in the side viewing angle interference mode. Next, in the period F24 of the second sub-frame time F20, the liquid crystal molecules of the liquid crystal layer 130 are driven by the electric field to be rotated to the position. Finally, the backlight module 160 is illuminated in the period F26 of the second sub-frame time F20, so that the user only sees the best view of the side view interference screen. In addition, the common potential may be a direct current common potential or an alternating current common potential, and the interference potential may vary with the common potential to maintain a fixed differential pressure between the two, but is not intended to limit the present invention.

It should be noted that this embodiment does not limit the relationship between the time length of each first sub-frame time F10 and the time length of each second sub-frame time F20, but the length of the first sub-frame time F10. The length of time of each second sub-frame time F20 may be greater to increase the display time of the normal picture.

In summary, the liquid crystal display device of the present invention and the driving method thereof can operate the liquid crystal molecules in different modes in the same architecture, so that the normal screen can be completely displayed or the side viewing angle can be inserted between the normal screens by simply changing the driving mode. Interfere with the picture. In this way, the side view picture can be interfered with the user's instruction to protect the user's privacy. Moreover, the liquid crystal display device of the present invention can achieve side viewing angle interference with almost no need to reduce the aperture ratio, light utilization efficiency, and resolution.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 102, 104. . . Liquid crystal display device

110. . . First substrate

112. . . Insulation

120. . . Second substrate

130. . . Liquid crystal layer

142, 144. . . Orientation film

152, 154. . . Polarizer

160. . . Backlight module

170. . . Front frame

P10, P12. . . Pixel electrode

P20, P22. . . Control electrode

P30. . . Common electrode

S10. . . First switch

S20. . . Second switch

S30. . . Third switch

L10. . . First wiring

L20. . . Second wiring

L30. . . Third wiring

C _st . . . Storage capacitor

C _LC . . . Liquid crystal capacitor

SLIT. . . Slit

D10. . . Orientation direction

E10, E20. . . power line

F10. . . First sub-frame time

F12, F14, F16, F22, F24, F26. . . Time slot

F20. . . Second sub-frame time

Ft. . . Picture frame time

1 is a partial cross-sectional view showing a state in which a liquid crystal display device according to an embodiment of the present invention is not driven.

2 is a circuit diagram of the liquid crystal display device of FIG. 1.

3 and FIG. 4 are partial cross-sectional views showing the liquid crystal display device of FIG. 1 driven in a normal mode and a side viewing angle interference mode, respectively.

Fig. 5 is a perspective view showing the liquid crystal molecules in the liquid crystal display device of Fig. 4 being poured.

Figure 6 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention when it is not driven.

Figure 7 is a top plan view of a single pixel electrode of the liquid crystal display device of Figure 1.

FIG. 8 is a modified exploded view of the liquid crystal display device of FIG. 1. FIG.

FIG. 9 is a timing diagram of a driving method according to an embodiment of the present invention.

P20. . . Control electrode

P30. . . Common electrode

S10. . . First switch

S20. . . Second switch

S30. . . Third switch

L10. . . First wiring

L20. . . Second wiring

L30. . . Third wiring

C _st . . . Storage capacitor

C _LC . . . Liquid crystal capacitor

Claims (14)

A liquid crystal display device comprising: a first substrate having a plurality of first switches, a plurality of first wires, a plurality of second wires, a plurality of pixel electrodes, a plurality of second switches, and a control electrode, wherein each of the plurality The pixel electrode is electrically connected to the first switch, and each of the first switches is driven by the corresponding first wire to turn on or off the corresponding second wire and the corresponding pixel electrode, and the second switch Electrically connecting the control electrode and the corresponding pixel electrode; a second substrate having a common electrode; and a liquid crystal layer disposed between the first substrate and the second substrate, wherein in a normal mode, Each of the second switches turns off the control electrode and the corresponding pixel electrode. In a side view interference mode, each of the second switches turns on the control electrode and the corresponding pixel electrode, wherein the control electrode is different from the The pixel electrodes are overlapped with the pixel electrodes in a direction perpendicular to the first substrate, and the liquid crystal display device is driven in the normal mode in a first sub-frame time, the liquid crystal display device A second sub-frame time to the drive-side perspective interference pattern, the first sub frame period and the second sub-frame alternating time. The liquid crystal display device of claim 1, wherein the pixel electrodes and the control electrode are located in different film layers. The liquid crystal display device of claim 1, wherein the pixel electrodes and the control electrode are located in the same film layer. The liquid crystal display device of claim 1, wherein the first substrate further has a third wiring, and each of the second switches is the third The wiring drive turns on or off the control electrode and the corresponding pixel electrode. The liquid crystal display device of claim 1, further comprising a third switch electrically connected to the control electrode and the common electrode, wherein in the normal mode, the third switch turns on the control electrode and the common An electrode, in the side view interference mode, the third switch disconnects the control electrode from the common electrode. The liquid crystal display device of claim 1, wherein the liquid crystal layer is a positive liquid crystal layer. The liquid crystal display device of claim 1, further comprising a backlight module, wherein the first substrate, the second substrate and the liquid crystal layer are disposed on the backlight module. The liquid crystal display device of claim 1, further comprising a second alignment film and a second polarizer, wherein the alignment films are respectively disposed on the surface of the first substrate and the second substrate adjacent to the liquid crystal layer, The polarizers are disposed on the surface of the first substrate and the second substrate away from the liquid crystal layer, and the alignment films horizontally align the liquid crystal layers and have substantially parallel alignment directions, and the polarizers are light. The transmission axes are perpendicular to each other, and the light transmission axis of at least one of the polarizers is perpendicular to the alignment direction of the alignment films. A driving method for a liquid crystal display device according to claim 1, wherein the driving method comprises alternately driving the liquid crystal display device in the normal mode in a first sub-frame time and in a second sub-frame The liquid crystal display device is driven in the side viewing angle interference mode during the picture frame time. The driving method of claim 9, wherein the liquid crystal display device further comprises a backlight module, in each of the first sub-frames The method includes: disconnecting the control electrode and the pixel electrodes, and batch driving the first switches to respectively write a plurality of display potentials from the second wires to the corresponding pixel electrodes, and to share a common potential Writing to the control electrode; and after the liquid crystal molecules of the liquid crystal layer are driven by the electric field to be rotated and positioned, the backlight module is lit. The driving method of claim 9, wherein the liquid crystal display device further comprises a backlight module, wherein each of the second sub-frames includes: turning on the control electrode and the pixel electrodes to The interference potential is written into the control electrode and the pixel electrodes, and a common potential is written into the common electrode; and after the liquid crystal molecules of the liquid crystal layer are driven by the electric field to be rotated and positioned, the backlight module is illuminated. The driving method according to claim 11, wherein the common potential is a direct current common potential or an alternating current common potential. The driving method of claim 9, wherein the control electrode and the common electrode are turned on in the normal mode, and the control electrode and the common electrode are turned off in the side view interference mode. The driving method of claim 9, wherein the length of time of each of the first sub-frames is less than the length of time of each of the second sub-frames.