Liquid crystal display device and driving method therefor, and display system

Abstract

The present application provides a liquid crystal display device and a driving method therefor, and a display system. The liquid crystal display device is provided with a first dimming component, a second dimming component, a first polarizer, and a second polarizer, the light transmission axis of the first polarizer is perpendicular to the light transmission axis of the second polarizer and an included angle between the light transmission axis of the first polarizer and a y axis is 45 degrees, and the projections of first liquid crystal molecules and the projections of second liquid crystal molecules on an x1y plane are parallel to the y axis, so that the switching between a sharing mode and a peep-proof mode can be realized, and the display effect in the peep-proof mode can be kept.

Description

Liquid crystal display device, driving method thereof, and display system Technical Field

[0001] The present application relates to the field of display technology, and in particular to a liquid crystal display device, a driving method thereof, and a display system. Background Art

[0002] TFT-LCD (thin film transistor-liquid crystal display) is widely used due to its advantages such as long life, mature technology and low price. With the development of intelligent vehicles, smart cockpits will be installed in cars, and display screens will be installed on the passenger seat and rear seat to improve the driving experience. However, in actual use, it is found that the display content of the passenger seat screen will interfere with the main driver, causing driving safety problems. To solve this problem, existing car displays use anti-peeping screens. The anti-peeping screen allows the passenger to have a normal experience, and the main driver cannot see the anti-peeping screen, thereby improving driving safety. However, in actual use, it is found that as the main driver's viewing position changes, the anti-peeping effect deteriorates, which in turn affects safety.

[0003] Therefore, the existing anti-peeping display device has the problem that the anti-peeping effect deteriorates as the angle of the human eye changes. Technical issues

[0004] Embodiments of the present application provide a liquid crystal display device, a driving method thereof, and a display system, to solve the problem that the anti-peeping effect of existing anti-peeping display devices deteriorates as the angle of the human eye changes. Technical Solutions

[0005] To solve the above problems, the technical solutions provided by this application are as follows:

[0006] An embodiment of the present application provides a liquid crystal display device, comprising:

[0007] Liquid crystal display panels;

[0008] a first polarizer, disposed on one side of the liquid crystal display panel;

[0009] a first dimming component, disposed on a side of the first polarizer away from the liquid crystal display panel, the first dimming component comprising a first electrode layer, a second electrode layer, and a first liquid crystal layer disposed between the first electrode layer and the second electrode layer, the first liquid crystal layer comprising first liquid crystal molecules;

[0010] a second dimming component, disposed on a side of the first dimming component away from the first polarizer, the second dimming component comprising a third electrode layer, a fourth electrode layer, and a second liquid crystal layer disposed between the third electrode layer and the fourth electrode layer, the second liquid crystal layer comprising second liquid crystal molecules;

[0011] a second polarizer, disposed on a side of the second dimming component away from the first dimming component, wherein a transmission axis of the second polarizer is perpendicular to a transmission axis of the first polarizer;

[0012] a backlight source, arranged on a side of the second polarizer away from the second dimming component;

[0013] In which, when the liquid crystal display device is configured in a first display mode, in a first coordinate system, the projection of the long axis of the first liquid crystal molecule on the x1y plane is parallel to the y axis, the projection of the long axis of the second liquid crystal molecule on the x1y plane is parallel to the y axis, and the angle between the transmission axis of the first polarizer and the y axis is 45 degrees; when the liquid crystal display device is configured in a second display mode, in a second coordinate system, the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees; the first coordinate system includes an x1 axis, a y axis and a z1 axis, the z1 axis is the direction from the backlight source to the second polarizer, the x1 axis, the y axis and the z1 axis are perpendicular to each other, and the second coordinate system includes an origin, an x2 axis, the y axis and the z2 axis, the x2 axis, the y axis and the z2 axis are perpendicular to each other and intersect at the origin, and the line connecting the human eye to the origin is the x2 axis.

[0014] At the same time, an embodiment of the present application provides a method for driving a liquid crystal display device, which drives the liquid crystal display device according to any of the above embodiments. The method for driving the liquid crystal display device includes:

[0015] Acquire a standby display mode of the liquid crystal display device;

[0016] When the standby display mode of the liquid crystal display device is the second display mode, obtaining an angle between the human eye and the x1 axis;

[0017] determining a driving voltage of the first electrode layer, a driving voltage of the second electrode layer, a driving voltage of the third electrode layer, and a driving voltage of the fourth electrode layer based on an angle between the human eye and the x1 axis;

[0018] Corresponding driving voltages are input to the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer respectively, so that the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees.

[0019] At the same time, an embodiment of the present application provides a display system, which includes a liquid crystal device, a data acquisition device and a controller as described in any of the above embodiments, wherein the controller is connected to the liquid crystal display device and the data acquisition device, and the data acquisition device is used to collect human eye data. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0021] FIG1 is a first schematic diagram of a liquid crystal display device provided in an embodiment of the present application.

[0022] FIG2 is a schematic structural diagram of a first dimming component in a liquid crystal display device provided in an embodiment of the present application.

[0023] FIG3 is a schematic structural diagram of a second dimming component in a liquid crystal display device provided in an embodiment of the present application.

[0024] FIG4 is a schematic diagram of a first liquid crystal molecule and a second liquid crystal molecule in a liquid crystal display device provided by an embodiment of the present application.

[0025] FIG5 is a second schematic diagram of a liquid crystal display device provided in an embodiment of the present application.

[0026] FIG6 is a schematic diagram of the projection of liquid crystal molecules in a second coordinate system provided by an embodiment of the present application.

[0027] FIG7 is a schematic diagram of projections of the first liquid crystal molecules and the second liquid crystal molecules in the second coordinate system provided by an embodiment of the present application.

[0028] FIG8 is a third schematic diagram of a liquid crystal display device provided in an embodiment of the present application.

[0029] FIG9 is a flowchart of a driving method of a liquid crystal display device provided in an embodiment of the present application.

[0030] FIG10 is a first schematic diagram of a display system provided in an embodiment of the present application.

[0031] FIG11 is a second schematic diagram of a display system provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0037] The embodiments of the present application address the problem that the anti-peeping effect of existing anti-peeping display devices deteriorates as the angle of the human eye changes. A liquid crystal display device, a driving method thereof, and a display system are provided to solve the above technical problems.

[0038] As shown in Figures 1 to 7, an embodiment of the present application provides a liquid crystal display device, which includes a liquid crystal display panel 11, a first polarizer 12, a first dimming component 13, a second dimming component 14, a second polarizer 15, and a backlight source 16. The first polarizer 12 is arranged on one side of the liquid crystal display panel 11; the first dimming component 13 is arranged on the side of the first polarizer 12 away from the liquid crystal display panel 11, the first dimming component 13 includes a first electrode layer 131, a second electrode layer 132, and a first liquid crystal layer 133 arranged between the first electrode layer 131 and the second electrode layer 132. The first liquid crystal layer 133 includes first liquid crystal molecules 133 a; a second dimming component 14 is disposed on a side of the first dimming component 13 away from the first polarizer 12, the second dimming component 14 includes a third electrode layer 141, a fourth electrode layer 142, and a second liquid crystal layer 143 disposed between the third electrode layer 141 and the fourth electrode layer 142, the second liquid crystal layer 143 includes second liquid crystal molecules 143a; a second polarizer 15 is disposed on a side of the second dimming component 14 away from the first dimming component 13, the transmission axis 151 of the second polarizer 15 is perpendicular to the transmission axis 121 of the first polarizer 12; a backlight source 16 is disposed on a side of the second polarizer 15 away from the second dimming component 14;

[0039] When the liquid crystal display device 1 is configured in the first display mode, in the first coordinate system x1yz1, the projection of the long axis 133b of the first liquid crystal molecule 133a on the x1y plane is parallel to the y axis, the projection of the long axis 143b of the second liquid crystal molecule 143a on the x1y plane is parallel to the y axis, and the angle between the transmission axis 121 of the first polarizer 12 and the y axis is 45 degrees; when the liquid crystal display device 1 is configured in the second display mode, in the second coordinate system x2yz2, the long axis of the first liquid crystal molecule 133a is parallel to the y axis. The angle B between the projection 133d of the surface and the projection 143d of the long axis of the second liquid crystal molecule 143a on the yz2 plane is 90 degrees; the first coordinate system includes an x1 axis, a y axis and a z1 axis, the z1 axis is the direction from the backlight source 16 to the second polarizer 15, the x1 axis, the y axis and the z1 axis are perpendicular to each other, the second coordinate system includes an origin O, an x2 axis, the y axis and the z2 axis, the x2 axis, the y axis and the z2 axis are perpendicular to each other and intersect at the origin O, and the line from the human eye 24 to the origin O is the x2 axis.

[0040] An embodiment of the present application provides a liquid crystal display device, which includes a first dimming component, a second dimming component, a first polarizer, and a second polarizer, so that the transmission axes of the first polarizer and the second polarizer are perpendicular and the angle between them and the y-axis is 45 degrees, and the projections of the first liquid crystal molecules and the second liquid crystal molecules on the x1y plane are parallel to the y-axis, so that when the liquid crystal display device is in a first display mode, at a front viewing angle or a side viewing angle, the projections of the first liquid crystal molecules and the second liquid crystal molecules on the x1y plane have an angle of 45 degrees with the dimming axis of the second polarizer, so that the light passing through the second polarizer can pass through the first polarizer normally after passing through the first dimming component and the second dimming component, thereby realizing the effect of the shared display mode of the liquid crystal display device. When the liquid crystal display device is in the first display mode, the deflection angles of the first liquid crystal layer and the second liquid crystal layer are adjusted so that the light passing through the second polarizer is at a predetermined angle. In the system, the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees, so that at the side viewing angle, the sum of the optical path differences generated by the light passing through the second polarizer passing through the first liquid crystal layer and the second liquid crystal layer is 0, so that the first dimming component and the second dimming component as a whole have no optical rotation effect on the light emitted by the second polarizer. The first polarizer will absorb the light emitted by the second polarizer, making it invisible when viewed from the side. However, at the front viewing angle, the light passing through the second polarizer can still be emitted normally, realizing the display effect in the anti-peeping mode. As the angle of the human eye changes, the position of the second coordinate system changes, but the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is kept at 90 degrees, so that as the angle of the human eye changes, the display effect in the anti-peeping mode can be maintained.

[0041] Specifically, as shown in Figure 1, when the liquid crystal display device is configured to the first display mode, the angle between the first liquid crystal molecule 133a and the second liquid crystal molecule 143a is an initial pretilt angle. At this time, when the human eye views the liquid crystal display device at a front view angle or a left or right side view angle, the first liquid crystal molecule 133a and the second liquid crystal molecule 143a have an angle of about 45 degrees (45 degrees when the initial pretilt angle of the first liquid crystal molecule and the second liquid crystal molecule is 0) with the transmission axis 151 of the second polarizer 15, so that the polarized light passing through the second polarizer 15 is rotated by the liquid crystal molecules in the first dimming component and the second dimming component and then passes through the first polarizer 12 normally, providing front view and side view light sources for the liquid crystal display panel, so that the liquid crystal display device can be viewed normally at both the front view angle and the left or right side view angles, thereby achieving the effect of the shared display mode.

[0042] Specifically, it can be understood that the front view angle in the present application is the angle along the z1 direction, and the left and right side view angles are the angles along the x1 direction.

[0043] Specifically, the angle between the projection 133d of the long axis of the first liquid crystal molecule 133a on the yz2 plane and the projection 143d of the long axis of the second liquid crystal molecule 143a on the yz2 plane can be determined based on the angle between the projection 133d of the long axis of the first liquid crystal molecule 133a on the yz2 plane and the y-axis and the angle between the projection 143d of the long axis of the second liquid crystal molecule 143a on the yz2 plane and the y-axis. Taking Figure 6 as an example, a liquid crystal molecule 21 is not arranged in the yz2 plane. The liquid crystal molecule projection 22 of the liquid crystal molecule 21 on the yz2 plane can be determined, and the liquid crystal molecule long axis 23 of the liquid crystal molecule projection 22 can be determined, so that the angle A between the projection of the long axis of the liquid crystal molecule 21 on the yz2 plane and the y-axis can be determined, and thus the angles between the projections of the long axes of multiple liquid crystal molecules on the yz2 plane can be determined. It can be understood that the position of the human eye 24 will change, causing the angle of the connection between the human eye 24 and the origin 0 to change, and the corresponding direction of z2 will change, causing the angle of the yz2 plane to change. Accordingly, the projection of the liquid crystal molecules on the yz2 plane can be determined, thereby adjusting the angle of the liquid crystal molecules accordingly, so that in any second coordinate system, the angle B between the projection 133d of the long axis of the first liquid crystal molecule 133a on the yz2 plane and the projection 143d of the long axis of the second liquid crystal molecule 143a on the yz2 plane is 90 degrees.

[0044] Specifically, as shown in Figures 5 to 7, when the liquid crystal display device is configured in the second display mode, the angle between the first liquid crystal molecules 133a and the second liquid crystal molecules 143a changes. At this time, when the human eye views the liquid crystal display device at a normal viewing angle, the first liquid crystal molecules 133a and the second liquid crystal molecules 143a still have an angle of about 45 degrees (45 degrees when the initial pre-tilt angle of the first liquid crystal molecules and the second liquid crystal molecules is 0) with the transmission axis 151 of the second polarizer 15, so that the polarized light passing through the second polarizer 15 is diverted by the first dimming component and the second dimming component. After optical rotation, the liquid crystal molecules pass through the first polarizer 12 normally, providing a normal light source for the liquid crystal display panel, so that the liquid crystal display device can be viewed normally at a normal viewing angle. At a side viewing angle, the first projection major axis 133d of the first projection 133c of the first liquid crystal molecule 133a on the yz2 plane of the second coordinate system and the second projection major axis 143d of the second projection 143c of the second liquid crystal molecule 143a on the yz2 plane of the second coordinate system are at an angle of 90 degrees, so that when the light emitted from the second polarizer passes through the second liquid crystal layer, a first optical path difference Δ is generated. 21 =(ne-no)*d1, where ne is the long-axis effective refractive index of the liquid crystal at a side viewing angle, no is the short-axis refractive index of the liquid crystal, and d1 is the distance that light travels in the second dimming component at a side viewing angle. Since the first liquid crystal molecules and the second liquid crystal molecules meet the above conditions, a second optical path difference △ is generated when light passes through the first liquid crystal layer. 11 =(-ne-(-no))*d1=-(ne-no)*d1, so that when the light emitted from the second polarizer passes through the second liquid crystal layer and the first liquid crystal layer, a total of △ 21 +△ 11 =(ne-no)d1-(ne-no)d1=0. That is, the first dimming component and the second dimming component have no optical rotation effect on the light emitted by the second polarizer. Since the transmission axes of the first and second polarizers are perpendicular, light at side viewing angles is absorbed, resulting in a black state when viewed from the side, achieving an anti-peeping display effect.

[0045] It can be understood that since in any second coordinate system, the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees, when the angle of the human eye changes, the corresponding second coordinate system changes, and the angle of the first liquid crystal molecule and the second liquid crystal molecule changes to meet the above conditions, so that the anti-peeping display effect can be achieved when the angle of the human eye changes.

[0046] Specifically, the directions of the transmission axes of the first polarizer and the second polarizer can be swapped. For example, taking the transmission axis of the first polarizer as 45 degrees to the y-axis and the transmission axis of the second polarizer as 135 degrees to the y-axis, the transmission axis of the first polarizer can be 135 degrees to the y-axis, and the transmission axis of the second polarizer can be 45 degrees to the y-axis.

[0047] In some embodiments, as shown in FIG1 and FIG4 , when the liquid crystal display device 1 is configured in the first display mode, within the first coordinate system, the angle C1 between the major axis 133b of the first liquid crystal molecule 133a and the y-axis is in a range of 2 degrees to 8 degrees, and the angle C2 between the major axis 143b of the second liquid crystal molecule 143a and the y-axis is in a range of 2 degrees to 8 degrees. Furthermore, the first liquid crystal molecule 133a is deflected in the positive direction of the z1 axis, while the second liquid crystal molecule 143a is deflected in the negative direction of the z1 axis. By providing the first and second liquid crystal molecules with a pretilt angle of 2 to 8 degrees, the first liquid crystal molecules and the second liquid crystal molecules can be more orderly deflected in the same direction during deflection, thereby improving the privacy protection effect. Furthermore, by causing the first liquid crystal molecules to deflect in the positive direction of the z1 axis and the second liquid crystal molecules 143a to deflect in the negative direction of the z1 axis, the first liquid crystal molecules and the second liquid crystal molecules are more likely to form an angle when deflected, thereby achieving the privacy protection effect.

[0048] Specifically, the angles between the first liquid crystal molecules and the second liquid crystal molecules and the y-axis are described as acute angles.

[0049] Specifically, it can be understood that the arrangement position of the first dimming component and the arrangement position of the second dimming component can be swapped, and the deflection directions of the first liquid crystal molecules and the second liquid crystal molecules can be swapped.

[0050] In some embodiments, as shown in FIG1 , the liquid crystal display device 1 further includes a third polarizer 17, which is disposed on a side of the liquid crystal display panel 11 away from the first polarizer 12. A transmission axis 171 of the third polarizer 17 is perpendicular to a transmission axis 121 of the first polarizer 12. By aligning the transmission axis of the third polarizer with the transmission axis of the first polarizer, the liquid crystal display panel can display and shut down normally through the deflection of the liquid crystal layer.

[0051] In some embodiments, as shown in FIG8 , the liquid crystal display device 1 further includes a fourth polarizer 32, a fifth polarizer 33, and a phase retarder layer 31. The phase retarder layer 31 is disposed between the first polarizer 12 and the liquid crystal display panel 11. The fourth polarizer 32 is disposed between the phase retarder layer 31 and the liquid crystal display panel 11. The fifth polarizer 33 is disposed on a side of the liquid crystal display panel 11 away from the fourth polarizer 32. The transmission axes of the fourth polarizer 32 and the fifth polarizer 33 are perpendicular. By providing the phase retarder layer, the fourth polarizer, and the fifth polarizer, the phase retarder layer can twist light passing through the first polarizer. When the transmission axes of the fourth polarizer and the fifth polarizer are parallel to the x1 axis and the y axis, respectively, light loss is avoided, allowing the liquid crystal display panel to display normally.

[0052] Specifically, the transmission axis of the fourth polarizer is parallel to the x1 axis, and the transmission axis of the fifth polarizer is parallel to the y axis.

[0053] In some embodiments, the projection of the first electrode layer 131 on the liquid crystal display panel 11 overlaps with the projection of the second electrode layer 132 on the liquid crystal display panel 11. By making the projection of the first electrode layer on the liquid crystal display panel overlap with the projection of the second electrode layer on the liquid crystal display panel, process steps can be reduced and the production efficiency of the liquid crystal display device can be improved.

[0054] In some embodiments, the projection of the third electrode layer 141 on the liquid crystal display panel 11 overlaps with the projection of the fourth electrode layer 142 on the liquid crystal display panel 11. By making the projection of the third electrode layer on the liquid crystal display panel overlap with the projection of the fourth electrode layer on the liquid crystal display panel, process steps can be reduced and the manufacturing efficiency of the liquid crystal display device can be improved.

[0055] Specifically, since the first and second dimming components in the embodiments of the present application serve as light adjustment structures, they can achieve light angle control through full-surface dimming. Therefore, when forming the first and second dimming components, the first, second, third, and fourth electrode layers can be uniformly arranged on the entire surface, thereby reducing process steps and improving the efficiency of liquid crystal display panel production. However, the embodiments of the present application are not limited to this, and at least one of the first, second, third, and fourth electrode layers can also utilize a patterned multiple electrode design.

[0056] Specifically, as shown in Figure 2, the first dimming component 13 also includes a first substrate 134, a first alignment layer 135, a second substrate 137 and a second alignment layer 136. The first liquid crystal layer 133 is aligned by the first alignment layer 135 and the second alignment layer 136, and the first liquid crystal layer 133 is protected by the first substrate 134 and the second substrate 137.

[0057] Specifically, the first dimming component may not be provided with a driving circuit layer and a color resist layer. Since the first dimming component does not need to display and only needs to perform dimming, the driving circuit layer and the color resist layer may not be provided, thereby reducing the thickness of the first dimming component. The first electrode layer and the second electrode layer in the first dimming component can be directly connected to the driving chip for signal input.

[0058] Specifically, as shown in Figure 3, the second dimming component 14 also includes a third substrate 144, a third alignment layer 145, a fourth substrate 147 and a fourth alignment layer 146. The second liquid crystal layer 143 is aligned by the third alignment layer 145 and the fourth alignment layer 146, and the second liquid crystal layer 143 is protected by the third substrate 144 and the fourth substrate 147.

[0059] Specifically, the second dimming component may not be provided with a driving circuit layer and a color resist layer. Since the second dimming component does not need to display and only needs to perform dimming, the driving circuit layer and the color resist layer may not be provided, thereby reducing the thickness of the second dimming component. The third electrode layer and the fourth electrode layer in the second dimming component can be directly connected to the driving chip for signal input.

[0060] In some embodiments, when the liquid crystal display device is configured in a first display mode, no voltage is applied to the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer. By enabling the first display mode and eliminating voltages on the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer, the liquid crystal display device consumes less power, and the second polarizer, the first dimming component, and the second dimming component of the liquid crystal display device are able to allow light to pass normally, thereby enabling the liquid crystal display device to display normally.

[0061] In some embodiments, when the liquid crystal display device is configured in the second display mode, the voltage difference between the first electrode layer and the second electrode layer is equal to the voltage difference between the third electrode layer and the fourth electrode layer, the acute angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is equal to the acute angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane, and the first liquid crystal molecule and the second liquid crystal molecule have opposite deflection directions on the z2 axis. When adjusting the angles of the liquid crystal molecules in the first and second liquid crystal layers, the electric field formed by the first and second electrode layers can be made equal to the electric field formed by the third and fourth electrode layers, so that the deflection angles of the first and second liquid crystal layers are the same, but the deflection directions of the first and second liquid crystal layers on the z2 axis are opposite, so that the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees, thereby achieving an anti-peeping display effect.

[0062] Specifically, the acute angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is 45 degrees, and the acute angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane is also 45 degrees.

[0063] Specifically, in any second coordinate system, when the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees, and the acute angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is equal to the acute angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane, the second electrode layer and the third electrode layer can be removed so that the first electrode layer and the fourth electrode layer form an electric field. By designing the pretilt angle, the first liquid crystal molecules and the second liquid crystal molecules are deflected in opposite directions, thereby reducing the thickness of the liquid crystal display device.

[0064] In some embodiments, when the liquid crystal display device is configured in the second display mode, the voltage difference between the first electrode layer and the second electrode layer is greater than or less than the voltage difference between the third electrode layer and the fourth electrode layer, and the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is different from the angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane. By making the voltage difference between the first electrode layer and the second electrode layer greater than or less than the voltage difference between the third electrode layer and the fourth electrode layer, the electric field formed by the first electrode layer and the second electrode layer is different from the electric field formed by the third electrode layer and the fourth electrode layer, resulting in different deflection angles of the first liquid crystal molecule and the second liquid crystal molecule. This allows the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane to remain at 90 degrees, thereby maintaining the anti-peeping display effect.

[0065] Specifically, the embodiments of the present application do not limit the structure of the liquid crystal display panel. The liquid crystal display panel may be an in-plane switching (IPS) liquid crystal display panel, a horizontal electric field reversal (HFS) liquid crystal display panel, a twisted nematic (TN) liquid crystal display panel, a super twisted nematic (STN) liquid crystal display panel, a vertical alignment (VA) liquid crystal display panel or a fringe electric field drive (FFS) liquid crystal display panel. The liquid crystal display panel may include an array substrate and a color filter substrate. The liquid crystal display panel may also include a COA (Color On Array, a color filter layer is arranged on the array side) substrate.

[0066] Specifically, the backlight source may be a direct-lit backlight source or an edge-lit backlight source.

[0067] At the same time, an embodiment of the present application provides a method for driving a liquid crystal display device, which drives the liquid crystal display device described in any of the above embodiments. The method for driving a liquid crystal display device includes:

[0068] S1, obtaining a standby display mode of a liquid crystal display device;

[0069] S2, when the standby display mode of the liquid crystal display device is the second display mode, obtaining the angle between the human eye and the x1 axis;

[0070] S3, determining a driving voltage of the first electrode layer, a driving voltage of the second electrode layer, a driving voltage of the third electrode layer, and a driving voltage of the fourth electrode layer based on an angle between the human eye and the x1 axis;

[0071] S4, input corresponding driving voltages to the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer respectively, so that the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees.

[0072] An embodiment of the present application provides a driving method for a liquid crystal display device. The driving method for the liquid crystal display device obtains a standby display mode of the liquid crystal display device, and when the standby display mode of the liquid crystal display device is the second display mode, obtains the angle between the human eye and the x1 axis, so that the driving voltage of the first electrode layer, the driving voltage of the second electrode layer, the driving voltage of the third electrode layer and the driving voltage of the fourth electrode layer can be determined based on the angle between the human eye and the x1 axis, and the corresponding driving voltages are input to the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer respectively, so that the deflection angles of the liquid crystal molecules of the first liquid crystal layer and the second liquid crystal layer can be adjusted accordingly, so that the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees, thereby achieving a display effect of maintaining an anti-peeping display as the position of the human eye changes.

[0073] Specifically, when obtaining the display mode of the liquid crystal display device, the display mode can be determined based on the information returned by the touch key (which can be a physical key or a virtual key) on the liquid crystal display device. For example, there are two virtual keys on the liquid crystal display device. Clicking virtual key one indicates switching to the first display mode, and clicking virtual key two indicates switching to the second display mode. The display mode can be determined based on the information returned by the virtual keys.

[0074] Specifically, when the standby display mode of the liquid crystal display device is the second display mode, the angle between the human eye and the x1 axis is obtained. As shown in Figure 10, taking the display system 10 as an example, the display system 10 includes a data acquisition device 2 and a liquid crystal display device 1. The angle D between the human eye 24 and the x1 axis can be obtained through the data acquisition device 2. Then, the driving voltage of the first electrode layer, the driving voltage of the second electrode layer, the driving voltage of the third electrode layer and the driving voltage of the fourth electrode layer can be determined based on the angle between the human eye and the x1 axis. For example, when the angle D between the human eye 24 and the x1 axis is 45 degrees, the driving voltage of the first electrode layer is 1 volt, the driving voltage of the second electrode layer is 0, the driving voltage of the third electrode layer is 1 volt, and the driving voltage of the fourth electrode layer is 0.

[0075] Specifically, when the standby display mode of the liquid crystal display device is the first display mode, the angle between the human eye and the x1 axis may not be obtained, and no driving voltage may be applied to the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer.

[0076] Specifically, the correspondence between the angle between the human eye and the x1 axis and the voltages of the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer can be pre-stored. For example, when the angle between the human eye and the x1 axis is 45 degrees, the voltages of the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer are 1 volt, 0 volt, 1 volt, and 0 volt, respectively. When the angle between the human eye and the x1 axis is 15 degrees, the voltages of the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer are 2 volts, 0.5 volts, 3 volts, and 0.5 volts, respectively. Therefore, after determining the angle between the human eye and the x1 axis, the voltages of the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer can be determined so that the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees.

[0077] Specifically, for example, when the angle between the human eye and the x1 axis changes from 45 degrees to 15 degrees, the voltages of the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer can be adjusted accordingly, so that the display content of the liquid crystal display device cannot be seen at the side viewing angle of the human eye, thereby maintaining the anti-peeping display as the position of the human eye changes.

[0078] Specifically, it can be understood that the position of the human eye described in the above embodiment is the position of the human eye in the side view direction, rather than the position of the human eye in the front view direction.

[0079] At the same time, as shown in Figure 11, an embodiment of the present application provides a display system, which includes a liquid crystal display device 1, a data acquisition device 2 and a controller 3 as described in any of the above embodiments. The controller 3 is connected to the liquid crystal display device 1 and the data acquisition device 2, and the data acquisition device 2 is used to collect human eye data.

[0080] Specifically, the data acquisition device may be a CCD (charge coupled device) camera, but the embodiments of the present application are not limited thereto. When the liquid crystal display device can obtain the position of the human eye, the data acquisition device may be set inside the liquid crystal display device.

[0081] Specifically, the controller may be a separately provided chip or control board, or may be a chip or control board within a liquid crystal display device or a CDD camera.

[0082] Specifically, the steps of the driving method of the liquid crystal display device described in any of the above embodiments may be executed by a controller.

[0083] Specifically, the controller can obtain the standby display mode of the liquid crystal display device. When the standby display mode of the liquid crystal display device is the second display mode, the angle between the human eye and the x1 axis sent by the data acquisition device is obtained. Then, based on the angle between the human eye and the x1 axis, the driving voltage of the first electrode layer, the driving voltage of the second electrode layer, the driving voltage of the third electrode layer and the driving voltage of the fourth electrode layer are determined, and the driving voltages of the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer are sent to the liquid crystal display device.

[0084] Specifically, the position of the human eye can be monitored by a data acquisition device, so that the deflection angle of the first liquid crystal layer and the second liquid crystal layer can be adjusted in real time by a controller to achieve the display effect of the anti-peeping mode while changing with the position of the human eye.

[0085] Specifically, the display system may be a vehicle-mounted display system.

[0086] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] The above is a detailed introduction to a liquid crystal display device, a driving method thereof, and a display system provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid crystal display device comprising: Liquid crystal display panels; a first polarizer, disposed on one side of the liquid crystal display panel; a first dimming component, disposed on a side of the first polarizer away from the liquid crystal display panel, the first dimming component comprising a first electrode layer, a second electrode layer, and a first liquid crystal layer disposed between the first electrode layer and the second electrode layer, the first liquid crystal layer comprising first liquid crystal molecules; a second dimming component, disposed on a side of the first dimming component away from the first polarizer, the second dimming component comprising a third electrode layer, a fourth electrode layer, and a second liquid crystal layer disposed between the third electrode layer and the fourth electrode layer, the second liquid crystal layer comprising second liquid crystal molecules; a second polarizer, disposed on a side of the second dimming component away from the first dimming component, wherein a transmission axis of the second polarizer is perpendicular to a transmission axis of the first polarizer; a backlight source, arranged on a side of the second polarizer away from the second dimming component; In which, when the liquid crystal display device is configured in a first display mode, in a first coordinate system, the projection of the long axis of the first liquid crystal molecule on the x1y plane is parallel to the y axis, the projection of the long axis of the second liquid crystal molecule on the x1y plane is parallel to the y axis, and the angle between the transmission axis of the first polarizer and the y axis is 45 degrees; when the liquid crystal display device is configured in a second display mode, in a second coordinate system, the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees; the first coordinate system includes an x1 axis, a y axis and a z1 axis, the z1 axis is the direction from the backlight source to the second polarizer, the x1 axis, the y axis and the z1 axis are perpendicular to each other, and the second coordinate system includes an origin, an x2 axis, the y axis and the z2 axis, the x2 axis, the y axis and the z2 axis are perpendicular to each other and intersect at the origin, and the line connecting the human eye to the origin is the x2 axis.

2. The liquid crystal display device according to claim 1, wherein When the liquid crystal display device is configured in the first display mode, in the first coordinate system, the angle between the long axis of the first liquid crystal molecule and the y-axis is in a range of 2 degrees to 8 degrees, the angle between the long axis of the second liquid crystal molecule and the y-axis is in a range of 2 degrees to 8 degrees, and the first liquid crystal molecule is deflected toward the positive direction of the z1 axis, and the second liquid crystal molecule is deflected toward the negative direction of the z1 axis.

3. The liquid crystal display device according to claim 1, wherein The liquid crystal display device further includes a third polarizer, which is disposed on a side of the liquid crystal display panel away from the first polarizer, and a transmission axis of the third polarizer is perpendicular to a transmission axis of the first polarizer.

4. The liquid crystal display device according to claim 1, wherein The liquid crystal display device also includes a fourth polarizer, a fifth polarizer and a phase delay layer, the phase delay layer is arranged between the first polarizer and the liquid crystal display panel, the fourth polarizer is arranged between the phase delay layer and the liquid crystal display panel, and the fifth polarizer is arranged on the side of the liquid crystal display panel away from the fourth polarizer, and the transmission axes of the fourth polarizer and the fifth polarizer are perpendicular.

5. The liquid crystal display device according to claim 1, wherein The projection of the first electrode layer on the liquid crystal display panel coincides with the projection of the second electrode layer on the liquid crystal display panel, and the projection of the third electrode layer on the liquid crystal display panel coincides with the projection of the fourth electrode layer on the liquid crystal display panel.

6. The liquid crystal display device according to claim 1, wherein When the liquid crystal display device is configured in a first display mode, no voltage is applied to the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer.

7. The liquid crystal display device according to claim 1, wherein When the liquid crystal display device is configured in the second display mode, the voltage difference between the first electrode layer and the second electrode layer is equal to the voltage difference between the third electrode layer and the fourth electrode layer, the acute angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is equal to the acute angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane, and the deflection directions of the first liquid crystal molecule and the second liquid crystal molecule on the z2 axis are opposite.

8. The liquid crystal display device according to claim 1, wherein When the liquid crystal display device is configured in the second display mode, the voltage difference between the first electrode layer and the second electrode layer is greater than or less than the voltage difference between the third electrode layer and the fourth electrode layer, and the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is not equal to the angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane.

9. The liquid crystal display device according to claim 1, wherein The liquid crystal display panel includes one of an in-plane switching liquid crystal display panel, a horizontal electric field inversion liquid crystal display panel, a twisted nematic liquid crystal display panel, a super twisted nematic liquid crystal display panel, a vertical alignment liquid crystal display panel and a fringe electric field driven liquid crystal display panel.

10. The liquid crystal display device according to claim 1, wherein The backlight source includes one of a direct-lit backlight source and an edge-lit backlight source.

11. A method for driving a liquid crystal display device, wherein: The liquid crystal display device according to claim 1 is driven, and the driving method of the liquid crystal display device comprises: Acquire a standby display mode of the liquid crystal display device; When the standby display mode of the liquid crystal display device is the second display mode, obtaining an angle between the human eye and the x1 axis; determining a driving voltage of the first electrode layer, a driving voltage of the second electrode layer, a driving voltage of the third electrode layer, and a driving voltage of the fourth electrode layer based on an angle between the human eye and the x1 axis; Corresponding driving voltages are input to the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer respectively, so that the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees.

12. A display system comprising a liquid crystal display device, a data acquisition device, and a controller, wherein the controller is connected to the liquid crystal display device and the data acquisition device, the data acquisition device is used to collect human eye data, and the liquid crystal display device comprises: Liquid crystal display panels; a first polarizer, disposed on one side of the liquid crystal display panel; a first dimming component, disposed on a side of the first polarizer away from the liquid crystal display panel, the first dimming component comprising a first electrode layer, a second electrode layer, and a first liquid crystal layer disposed between the first electrode layer and the second electrode layer, the first liquid crystal layer comprising first liquid crystal molecules; a second dimming component, disposed on a side of the first dimming component away from the first polarizer, the second dimming component comprising a third electrode layer, a fourth electrode layer, and a second liquid crystal layer disposed between the third electrode layer and the fourth electrode layer, the second liquid crystal layer comprising second liquid crystal molecules; a second polarizer, disposed on a side of the second dimming component away from the first dimming component, wherein a transmission axis of the second polarizer is perpendicular to a transmission axis of the first polarizer; a backlight source, arranged on a side of the second polarizer away from the second dimming component; When the liquid crystal display device is configured in a first display mode, in a first coordinate system, the projection of the long axis of the first liquid crystal molecule on the x1y plane is parallel to the y axis, the projection of the long axis of the second liquid crystal molecule on the x1y plane is parallel to the y axis, and the angle between the transmission axis of the first polarizer and the y axis is 45 degrees; when the liquid crystal display device is configured in a second display mode, in a second coordinate system, The angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the projection of the long axis of the second liquid crystal molecule on the yz2 plane is 90 degrees; the first coordinate system includes an x1 axis, a y axis and a z1 axis, the z1 axis is the direction from the backlight source to the second polarizer, the x1 axis, the y axis and the z1 axis are perpendicular to each other, and the second coordinate system includes an origin, an x2 axis, the y axis and the z2 axis, the x2 axis, the y axis and the z2 axis are perpendicular to each other and intersect at the origin, and the line connecting the human eye to the origin is the x2 axis.

13. The display system according to claim 12, wherein: When the liquid crystal display device is configured in the first display mode, in the first coordinate system, the angle between the long axis of the first liquid crystal molecule and the y-axis is in a range of 2 degrees to 8 degrees, the angle between the long axis of the second liquid crystal molecule and the y-axis is in a range of 2 degrees to 8 degrees, and the first liquid crystal molecule is deflected toward the positive direction of the z1 axis, and the second liquid crystal molecule is deflected toward the negative direction of the z1 axis.

14. The display system according to claim 12, wherein: The liquid crystal display device further includes a third polarizer, which is disposed on a side of the liquid crystal display panel away from the first polarizer, and a transmission axis of the third polarizer is perpendicular to a transmission axis of the first polarizer.

15. The display system according to claim 12, wherein: The liquid crystal display device also includes a fourth polarizer, a fifth polarizer and a phase delay layer, the phase delay layer is arranged between the first polarizer and the liquid crystal display panel, the fourth polarizer is arranged between the phase delay layer and the liquid crystal display panel, and the fifth polarizer is arranged on the side of the liquid crystal display panel away from the fourth polarizer, and the transmission axes of the fourth polarizer and the fifth polarizer are perpendicular.

16. The display system according to claim 12, wherein: The projection of the first electrode layer on the liquid crystal display panel coincides with the projection of the second electrode layer on the liquid crystal display panel, and the projection of the third electrode layer on the liquid crystal display panel coincides with the projection of the fourth electrode layer on the liquid crystal display panel.

17. The display system according to claim 12, wherein: When the liquid crystal display device is configured in a first display mode, no voltage is applied to the first electrode layer, the second electrode layer, the third electrode layer, and the fourth electrode layer.

18. The display system according to claim 12, wherein: When the liquid crystal display device is configured in the second display mode, the voltage difference between the first electrode layer and the second electrode layer is equal to the voltage difference between the third electrode layer and the fourth electrode layer, the acute angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is equal to the acute angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane, and the deflection directions of the first liquid crystal molecule and the second liquid crystal molecule on the z2 axis are opposite.

19. The display system according to claim 12, wherein: When the liquid crystal display device is configured in the second display mode, the voltage difference between the first electrode layer and the second electrode layer is greater than or less than the voltage difference between the third electrode layer and the fourth electrode layer, and the angle between the projection of the long axis of the first liquid crystal molecule on the yz2 plane and the y-axis is not equal to the angle between the projection of the long axis of the second liquid crystal molecule on the yz2 plane.

20. The display system according to claim 12, wherein: The liquid crystal display panel includes one of an in-plane switching liquid crystal display panel, a horizontal electric field inversion liquid crystal display panel, a twisted nematic liquid crystal display panel, a super twisted nematic liquid crystal display panel, a vertical alignment liquid crystal display panel and a fringe electric field driven liquid crystal display panel.

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