Liquid crystal lens device, liquid crystal lens display system and driving method

Abstract

The present invention provides a liquid crystal lens device, a liquid crystal lens display system, and a driving method. By configuring a first liquid crystal lens unit, a second liquid crystal lens unit, and a liquid crystal optical rotation assembly, not only can rapid switching between different focal lengths be achieved, but also a shorter focal length or a larger diopter can be achieved. When rapid switching between different focal lengths is required, the liquid crystal optical rotation assembly can be switched between a first state and a second state, and the first and second liquid crystal lens units can be controlled to operate alternately accordingly. In this case, the zoom response time of the liquid crystal lens device is only affected by the driving voltages of the first and second liquid crystal lens units. Furthermore, by setting the driving voltages, the response time of the liquid crystal lens device switching between different focal lengths can be kept consistent, thereby improving the display effect of the liquid crystal lens device. The liquid crystal optical rotation assembly can be adjusted to a third state, and the first and second liquid crystal lens units can be controlled to operate simultaneously, to achieve a shorter focal length or a larger diopter.

Description

Technical Field

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

[0002] With the continuous development of liquid crystal technology, liquid crystals are widely used in display technology, various optical devices, and other fields. Due to the anisotropy of the liquid crystal molecular structure, light propagating through the liquid crystal undergoes birefringence, generating ordinary light (o light) and extraordinary light (e light), exhibiting optical anisotropy. Liquid crystal, as a material with anisotropic refractive index, produces phase delays of varying magnitudes when incident light is incident with different polarization directions. By controlling the refractive index of the liquid crystal molecules through voltage, different phase delay amounts can be modulated. When a beam of polarized light passes through a chiral left-handed liquid crystal or a chiral right-handed liquid crystal, its vibration plane rotates. From the perspective of light propagation, a chiral right-handed liquid crystal rotates the vibration plane in a clockwise direction, while a chiral left-handed liquid crystal rotates the vibration plane in a counterclockwise direction. Chiral left-handed liquid crystals or chiral right-handed liquid crystals can be obtained by adding an appropriate amount of chiral agent to the liquid crystal.

[0003] A liquid crystal optical rotator is an electrically adjustable optical element that adjusts the polarization state of incident light by varying the driving voltage to determine whether the liquid crystal molecules exhibit an optical rotation effect. A liquid crystal optical rotator typically comprises an upper substrate, a lower substrate, and a liquid crystal layer, with the liquid crystal layer disposed between the upper and lower substrates. The upper and lower electrodes are typically provided with an upper electrode, and the rubbing direction of the upper and lower electrodes forms a twist angle (preset angle). Liquid crystal optical rotators typically have an on and off state. When linearly polarized light passes through the device, if the device is off, the liquid crystal exhibits an optical rotation effect, rotating the polarization direction of the linearly polarized light in a predetermined direction and angle, resulting in either linear polarization or elliptically polarized light. If the device is on, the optical rotation effect disappears, and the polarization direction of the linearly polarized light remains unchanged.

[0004] A liquid crystal lens is an optical component that uses the birefringence of liquid crystal molecules and their ability to align in response to an electric field to focus or diverge a light beam. By varying the driving voltage, the alignment of the liquid crystal molecules can be altered, achieving variable focal length, thereby achieving an effective optical zoom effect within a compact space. For a liquid crystal lens, response time refers to the time it takes for the lens to transition from one relatively stable state to another during the switching of the driving voltage. The response time of a liquid crystal lens generally consists of two components: the power-on response time and the power-off response time. Due to the capacitance between the liquid crystal molecules and their rotational viscosity, the time it takes for the liquid crystal molecules to return to their initial state after the electric field is removed is much longer than the time it takes under electric field control. In other words, when the device is fixed, the power-on response time is primarily controlled by the driving voltage, while the power-off response time is primarily limited by the properties of the liquid crystal material. Therefore, the power-off response time is typically much longer than the power-on response time. In other words, the response time of a liquid crystal lens is primarily determined by the power-off response time.

[0005] In the prior art, multiple liquid crystal lenses are usually combined into a liquid crystal lens device for use according to different needs. For example, the rubbing directions of multiple liquid crystal lenses are set in antiparallel, and the multiple liquid crystal lenses work simultaneously to achieve more focal lengths or a larger refractive power; or, by setting the rubbing directions of multiple liquid crystal lenses orthogonally, and the multiple liquid crystal lenses work simultaneously to respond to natural light, multiple focal lengths or a larger refractive power can also be achieved. However, the current zoom efficiency of liquid crystal lenses is greatly affected by the power-off response time, and the response speed of switching between different focal lengths varies, which seriously affects the display smoothness during the focal length switching process and affects the visual experience. In order to improve the smoothness of the display, in some prior art, the rubbing directions of multiple lenses are set orthogonally and a 90-degree optical rotation device is used to form a liquid crystal lens device to achieve rapid switching of the focal length (the incident light needs to be linearly polarized light). However, the refractive power of such a liquid crystal lens device is generally small, which is not conducive to achieving short focal length display.

[0006] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the existing technologies in this field. Summary of the Invention

[0007] In view of one or more deficiencies in the prior art, the present invention provides a liquid crystal lens device, comprising:

[0008] A liquid crystal optical rotator component has a first state, a second state, and a third state. In the first state, the liquid crystal optical rotator component rotates the polarization direction of first linearly polarized light passing therethrough by a first preset angle and emits a first light polarized in the first direction. In the second state, the liquid crystal optical rotator component rotates the polarization direction of the first linearly polarized light passing therethrough by a second preset angle and emits a second light polarized in the second direction. In the third state, the liquid crystal optical rotator component maintains the polarization direction of the first linearly polarized light passing therethrough unchanged.

[0009] a first liquid crystal lens unit disposed downstream of the optical path of the liquid crystal optical rotation component, wherein the first liquid crystal lens unit is rubbed and aligned along a first direction; and

[0010] The second liquid crystal lens unit is disposed downstream of the optical path of the first liquid crystal lens unit, wherein the second liquid crystal lens unit is rubbed and aligned along a second direction.

[0011] According to one aspect of the present invention, the liquid crystal optical rotation component comprises:

[0012] a first liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the first preset angle and emits the light; and

[0013] a second liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the second preset angle and emits the light;

[0014] The first liquid crystal optical rotator device and the second liquid crystal optical rotator device are arranged in an overlapping manner. The first liquid crystal optical rotator device is a chiral left-handed liquid crystal optical rotator device, and the second liquid crystal optical rotator device is a chiral right-handed liquid crystal optical rotator device.

[0015] When the first liquid crystal optical rotator device is in an off state and the second liquid crystal optical rotator device is in an on state, the liquid crystal optical rotator component is in a first state; when the first liquid crystal optical rotator device is in an on state and the second liquid crystal optical rotator device is in an off state, the liquid crystal optical rotator component is in a second state; when both the first liquid crystal optical rotator device and the second liquid crystal optical rotator device are in an on state, the liquid crystal optical rotator component is in a third state.

[0016] According to one aspect of the present invention, the first liquid crystal lens unit includes one or more first liquid crystal lenses; and the second liquid crystal lens unit includes one or more second liquid crystal lenses.

[0017] According to one aspect of the present invention, the first direction and the second direction have an angle of 70-90°.

[0018] According to one aspect of the present invention, the first preset angle and the second preset angle are the same in size but opposite in direction.

[0019] According to one aspect of the present invention, the device further includes a control unit electrically connected to the liquid crystal optical rotation component, the first liquid crystal lens unit, and the second liquid crystal lens unit, respectively. The control unit is configured to switch the liquid crystal optical rotation component to the first state, the second state, or the third state, and to drive the first liquid crystal lens unit and / or the second liquid crystal lens unit to adjust the liquid crystal lens device to a target focal length.

[0020] According to one aspect of the present invention, the control unit is configured to: when the liquid crystal optical rotation component is switched to a first state, drive the first liquid crystal lens unit to drive the focal length of the first liquid crystal lens unit to a target focal length of the liquid crystal lens device; when the liquid crystal optical rotation component is switched to a second state, drive the second liquid crystal lens unit to drive the second liquid crystal lens unit to the target focal length of the liquid crystal lens device; and when the liquid crystal optical rotation component is switched to a third state, drive the first and second liquid crystal lens units to jointly provide the target focal length of the liquid crystal lens device via the first and second liquid crystal lens units.

[0021] According to one aspect of the present invention, the first liquid crystal optical rotator device and the second liquid crystal optical rotator device both satisfy the requirement that the product of the cell thickness and the liquid crystal refractive index anisotropy is an integer multiple of the wavelength of the first linearly polarized light.

[0022] The present invention also provides a liquid crystal lens display system, comprising:

[0023] A display module, configured to emit image light, wherein the image light is first linearly polarized light;

[0024] As described above, the liquid crystal lens device is arranged downstream of the optical path of the display module to receive the first linearly polarized light and project it out.

[0025] The present invention further provides a driving method for a liquid crystal lens device, wherein the liquid crystal lens device includes a liquid crystal optical rotation component, a first liquid crystal lens unit, and a second liquid crystal lens unit, and the driving method includes:

[0026] Switching the liquid crystal optical rotation component to a first state, a second state, or a third state, wherein in the first state, the liquid crystal optical rotation component rotates the polarization direction of the first linearly polarized light passing therethrough by a first preset angle and emits a first light polarized along the first direction; in the second state, the liquid crystal optical rotation component rotates the polarization direction of the first linearly polarized light passing therethrough by a second preset angle and emits a second light polarized along the second direction; in the third state, the liquid crystal optical rotation component maintains the polarization direction of the first linearly polarized light passing therethrough unchanged;

[0027] The first liquid crystal lens unit and / or the second liquid crystal lens unit are driven to adjust the liquid crystal lens device to a target focal length.

[0028] According to one aspect of the present invention, the liquid crystal optical rotation component comprises:

[0029] a first liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the first preset angle and emits the light; and

[0030] a second liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the second preset angle and emits the light;

[0031] In the step of switching the liquid crystal optical rotator component to the first state, the second state, or the third state, the liquid crystal optical rotator component is switched to the first state by switching the first liquid crystal optical rotator device to the off state and the second liquid crystal optical rotator device to the on state; the liquid crystal optical rotator component is switched to the second state by switching the first liquid crystal optical rotator device to the on state and the second liquid crystal optical rotator device to the off state; and the liquid crystal optical rotator component is switched to the third state by switching both the first liquid crystal optical rotator device and the second liquid crystal optical rotator device to the on state.

[0032] According to one aspect of the present invention, when the liquid crystal optical rotation component is switched to a first state, the first liquid crystal lens unit is driven to adjust the liquid crystal lens device to a target focal length; when the liquid crystal optical rotation component is switched to a second state, the second liquid crystal lens unit is driven to adjust the liquid crystal lens device to the target focal length; and when the liquid crystal optical rotation component is switched to a third state, the first liquid crystal lens unit and the second liquid crystal lens unit are driven to adjust the liquid crystal lens device to the target focal length.

[0033] According to one aspect of the present invention, the liquid crystal lens device is configured to receive first linearly polarized light; the first liquid crystal lens unit is rubbed and oriented along a first direction, and the second liquid crystal lens unit is rubbed and oriented along a second direction, the first liquid crystal lens unit includes one or more first liquid crystal lenses, and the second liquid crystal lens unit includes one or more second liquid crystal lenses.

[0034] Compared to the prior art, embodiments of the present invention provide a liquid crystal lens device, a liquid crystal lens display system, and a driving method. By configuring a first liquid crystal lens unit and a second liquid crystal lens unit in conjunction with a liquid crystal optical rotation assembly, not only can rapid switching between different focal lengths be achieved, but also a shorter focal length or a larger diopter can be achieved. For example, when rapid switching between different focal lengths is required, the liquid crystal optical rotation assembly can be switched between a first state and a second state, and the first and second liquid crystal lens units can be controlled to operate alternately accordingly. In this case, the zoom response time of the liquid crystal lens device is only affected by the driving voltages of the first and second liquid crystal lens units. Furthermore, by adjusting the driving voltages, the response time of the liquid crystal lens device switching between different focal lengths can be kept consistent, thereby improving the display effect of the liquid crystal lens device. For another example, the liquid crystal optical rotation assembly can be adjusted to a third state, and the first and second liquid crystal lens units can be controlled to operate simultaneously, to achieve a shorter focal length or a larger diopter. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 A schematic diagram of a liquid crystal lens device according to an embodiment of the present invention is shown;

[0037] Figure 2 A schematic diagram showing a first direction, a second direction, and a polarization direction of a first linearly polarized light according to an embodiment of the present invention is shown;

[0038] Figure 3 FIG2 shows a schematic diagram of a working state of a liquid crystal lens device according to an embodiment of the present invention;

[0039] Figure 4 Shown Figure 3 When the first and second liquid crystal optical rotator devices have weak anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices;

[0040] Figure 5 Shown Figure 3When the first and second liquid crystal optical rotator devices have strong anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices;

[0041] Figure 6 shows another working state schematic diagram of a liquid crystal lens device according to an embodiment of the present invention;

[0042] Figure 7 Shown Figure 6 When the first and second liquid crystal optical rotator devices have weak anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices;

[0043] Figure 8 Shown Figure 6 When the first and second liquid crystal optical rotator devices have strong anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices;

[0044] Figure 9 shows another working state schematic diagram of a liquid crystal lens device according to an embodiment of the present invention;

[0045] Figure 10 Shown Figure 9 When the first and second liquid crystal optical rotator devices have weak anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices;

[0046] Figure 11 Shown Figure 9 When the first and second liquid crystal optical rotator devices have strong anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices;

[0047] Figure 12 A partial structural schematic diagram of a liquid crystal lens display system according to an embodiment of the present invention is shown;

[0048] Figure 13 A flow chart showing a method for driving a liquid crystal lens device according to an embodiment of the present invention is shown.

[0049] In the figure: 100, liquid crystal lens device; 110, liquid crystal optical rotation component; 111, first liquid crystal optical rotation device; 112, second liquid crystal optical rotation device; 120, first liquid crystal lens unit; 130, second liquid crystal lens unit; 200, liquid crystal lens display system; 210, display module; 300, driving method. DETAILED DESCRIPTION

[0050] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0051] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the aforementioned features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0052] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, removable, or integral connections; mechanical, electrical, or intercommunication connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] In the present invention, 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 also include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is at a lower level than the second feature.

[0054] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0055] The following describes embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0056] Figure 1 1 is a schematic diagram showing a liquid crystal lens device 100 according to an embodiment of the present invention, Figure 2 A schematic diagram showing the first direction, the second direction and the polarization direction of the first linear polarized light according to an embodiment of the present invention is shown below. Figure 1 and Figure 2 Provide a detailed description.

[0057] like Figure 1As shown, the liquid crystal lens device 100 includes a stacked liquid crystal optical rotation assembly 110, a first liquid crystal lens unit 120, and a second liquid crystal lens unit 130. The first liquid crystal lens unit 120 is disposed downstream of the liquid crystal optical rotation assembly 110, and the second liquid crystal lens unit 130 is disposed downstream of the first liquid crystal lens unit 120. The liquid crystal optical rotation assembly 110 has a first state, a second state, and a third state, and can be rapidly switched between the first state, the second state, and the third state. In the first state, the liquid crystal optical rotation assembly 110 rotates the polarization direction of first linearly polarized light passing therethrough by a first predetermined angle and emits a first light polarized in the first direction. In the second state, the liquid crystal optical rotation assembly 110 rotates the polarization direction of the first linearly polarized light passing therethrough by a second predetermined angle and emits a second light polarized in the second direction. In the third state, the liquid crystal optical rotation assembly 110 maintains the polarization direction of the first linearly polarized light passing therethrough unchanged. The first liquid crystal lens unit 120 is rubbed and aligned along a first direction. Specifically, the first liquid crystal lens unit 120 may include one or more first liquid crystal lenses, which are rubbed and aligned along the first direction. The focal length of the first liquid crystal lens unit 120 can be adjusted based on the driving voltage applied to the first liquid crystal lens unit 120. The second liquid crystal lens unit 130 is rubbed and aligned along a second direction. Specifically, the second liquid crystal lens unit 130 may include one or more second liquid crystal lenses, which are rubbed and aligned along the second direction. The focal length of the second liquid crystal lens unit 130 can be adjusted based on the driving voltage applied to the second liquid crystal lens unit 130. The first and second liquid crystal lenses may be gradient refractive index lenses (microlens arrays) or Fresnel liquid crystal lenses.

[0058] According to one aspect of the present invention, Figure 1 and Figure 2 As shown, the first direction and the second direction have an angle of 70-90° between them, and the polarization direction of the first linearly polarized light lies between the first and second directions. Preferably, the angle between the polarization direction of the first linearly polarized light and the first direction is equal to the angle between the polarization direction of the first linearly polarized light and the second direction. That is, the first preset angle and the second preset angle are equal in magnitude but opposite in direction. For example, in this embodiment, the first direction and the second direction have an angle of 90° between them. With reference to a rectangular coordinate system, the first direction is the X-axis direction, the second direction is the Y-axis direction, the polarization direction of the first linearly polarized light is -45°, the first preset angle is 45°, and the second preset angle is -45°.

[0059] In the present invention, by controlling the liquid crystal optical rotation component 110 to switch between the first state and the second state, and correspondingly controlling the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 to operate alternately, the liquid crystal lens device 100 can provide different focal lengths as needed and achieve rapid switching between different focal lengths.

[0060] Specifically, when the first liquid crystal lens unit 120 is in an operating state, the liquid crystal molecules in the second liquid crystal lens unit 130 may be in an initial alignment position (for example, when the second liquid crystal lens unit 130 has not been used for a long period of time, the liquid crystal molecules in the second liquid crystal lens unit 130 are in the initial alignment position). The liquid crystal molecules in the second liquid crystal lens unit 130 may also be in the process of recovering from a certain state to the initial alignment position (for example, when the second liquid crystal lens unit 130 has just switched from an operating state to a closed state). However, due to the large angle between the first direction and the second direction (an angle of 70-90°), the focal length of the liquid crystal lens device 100 is determined only by the first liquid crystal lens unit 120 and is not affected by the second liquid crystal lens unit 130. Accordingly, when the second liquid crystal lens unit 130 is in the operating state, the liquid crystal molecules in the first liquid crystal lens unit 120 may be in the initial alignment position, or the liquid crystal molecules in the first liquid crystal lens unit 120 may be in the process of returning to the initial alignment position from a certain state. However, due to the large angle (70-90°) between the first direction and the second direction, the focal length of the liquid crystal lens device 100 is determined only by the second liquid crystal lens unit 130 and is not affected by the first liquid crystal lens unit 120.

[0061] Therefore, in the present invention, by controlling the liquid crystal optical rotation component 110 to switch between the first and second states, and correspondingly controlling the alternating operation of the first and second liquid crystal lens units 120 and 130, the liquid crystal lens device 100 can rapidly switch between different focal lengths (the zoom response time of the liquid crystal lens device 100 is affected only by the driving voltages of the first and second liquid crystal lens units 120, 130). By adjusting the driving voltages of the first and second liquid crystal lens units 120, 130, the response time of the liquid crystal lens device 100 switching between different focal lengths can also be maintained consistent, thereby improving the display quality of the liquid crystal lens device 100. Because the angle between the polarization direction of the first linearly polarized light and the first direction is preferably equal to the angle between the polarization direction of the first linearly polarized light and the second direction (the first and second predetermined angles are of equal magnitude and opposite directions), the brightness exhibited by the liquid crystal lens device 100 is substantially consistent when the first and second liquid crystal lens units 120, 130 operate alternately.

[0062] In the present invention, the liquid crystal optical rotation component 110 can also be switched to a third state, and the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 can be controlled to operate simultaneously. In this state, the polarization direction of the first linearly polarized light remains unchanged after passing through the liquid crystal optical rotation component 110. Because the polarization direction of the first linearly polarized light preferably has the same angle (e.g., 45°) with the rubbing direction (first direction) of the first liquid crystal lens unit 120 and the rubbing direction (second direction) of the second liquid crystal lens unit 130, and these angles are relatively small, the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 both converge the first linearly polarized light. The focal length of the liquid crystal lens device 100 is determined by the first and second liquid crystal lens units 120, 130, allowing the liquid crystal lens device 100 to have a larger refractive power and a smaller focal length. For example, when the first and second liquid crystal lens units 120, 130 have the same focal length f, the focal length of the liquid crystal lens device 100 is 0.5f, doubling the refractive power.

[0063] According to one embodiment of the present invention, Figure 1 As shown, the liquid crystal optical rotator assembly 110 includes a first liquid crystal optical rotator 111 and a second liquid crystal optical rotator 112, each of which has an on state and an off state. The first liquid crystal optical rotator 111 can be, for example, a chiral left-handed liquid crystal optical rotator. In the on state, the first liquid crystal optical rotator 111 maintains the polarization direction of the first linearly polarized light passing through it unchanged. In the off state, the first liquid crystal optical rotator 111 rotates the polarization direction of the first linearly polarized light passing through it by a first preset angle and emits it. The second liquid crystal optical rotator 112 can be, for example, a chiral right-handed liquid crystal optical rotator. In the on state, the second liquid crystal optical rotator 112 maintains the polarization direction of the first linearly polarized light passing through it unchanged. In the off state, the second liquid crystal optical rotator 112 rotates the polarization direction of the first linearly polarized light passing through it by a second preset angle and emits it.

[0064] By controlling the first and second liquid crystal optical rotator devices 111 and 112 to switch between an on state and an off state, the liquid crystal optical rotator assembly 110 can be rapidly switched between a first state, a second state, and a third state. Specifically, when the first liquid crystal optical rotator device 111 is in an off state and the second liquid crystal optical rotator device 112 is in an on state, the liquid crystal optical rotator assembly 110 is in the first state. When the first liquid crystal optical rotator device 111 is in an on state and the second liquid crystal optical rotator device 112 is in an off state, the liquid crystal optical rotator assembly 110 is in the second state. When both the first and second liquid crystal optical rotator devices 111 and 112 are in an on state, the liquid crystal optical rotator assembly 110 is in the third state.

[0065] According to one embodiment of the present invention, Figure 1 and Figure 2 As shown, both the first liquid crystal optical rotator 111 and the second liquid crystal optical rotator 112 satisfy that the product of the cell thickness and the refractive index anisotropy of the liquid crystal is an integer multiple of the wavelength of the first linearly polarized light. For example, the first liquid crystal optical rotator 111 satisfies Δn1d1=k1λ, and the second liquid crystal optical rotator 112 satisfies Δn2d2=k2λ, where λ is the wavelength of the first linearly polarized light, Δn1 is the refractive index anisotropy value of the liquid crystal material used in the first liquid crystal optical rotator 111, d1 is the cell thickness of the first liquid crystal optical rotator 111 (the thickness of the liquid crystal layer), Δn2 is the refractive index anisotropy value of the liquid crystal material used in the second liquid crystal optical rotator 112, d2 is the cell thickness of the second liquid crystal optical rotator 112 (the thickness of the liquid crystal layer), and k2 and k1 are constants. According to the above configuration, when the first liquid crystal optical rotator 111 is off, it can rotate the first linearly polarized light by a first preset angle (e.g., 45°) and emit a first light polarized in a first direction. When the second liquid crystal optical rotator 112 is off, it can rotate the first linearly polarized light by a second preset angle (e.g., -45°) and emit a second light polarized in a second direction. The first liquid crystal optical rotator 111, the second liquid crystal optical rotator 112, the first liquid crystal lens unit 120, and the second liquid crystal lens unit 130 can all be made of positive liquid crystal material.

[0066] Liquid crystal alignment films are typically placed on the upper and lower substrates of a liquid crystal optical rotator. The anchoring energy of the liquid crystal alignment films on the liquid crystal molecules (the anchoring effect of the substrate surface on the nematic liquid crystal is generally described by anchoring free energy, with anchoring free energy per unit area being called anchoring energy) will have a certain impact on the polarization state of linearly polarized light passing through the liquid crystal optical rotator in the on state. When the anchoring energy is high, even if a high voltage is applied to the upper and lower electrodes of the liquid crystal optical rotator, some liquid crystal molecules will not change their original alignment, especially those close to the liquid crystal alignment films. This will cause residual phase retardation during operation of the liquid crystal optical rotator. For twisted nematic liquid crystals, this residual phase retardation persists, regardless of whether the twist is 90° or 45°. This residual phase retardation will have a certain impact on the polarization state of linearly polarized light passing through the liquid crystal optical rotator. Taking the chiral left-handed liquid crystal optical rotator as an example, when the anchoring energy is strong, the linearly polarized light becomes left-handed elliptically polarized light after passing through the chiral left-handed liquid crystal optical rotator; when the anchoring energy is weak, the linearly polarized light remains linearly polarized light after passing through the chiral left-handed liquid crystal optical rotator.

[0067] Figure 3 FIG2 shows a schematic diagram of a working state of a liquid crystal lens device 100 according to an embodiment of the present invention; Figure 4 Shown Figure 3In the case where the first and second liquid crystal optical rotator devices 111 and 112 have weak anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices 111 and 112; Figure 5 Shown Figure 3 In the case where the first and second liquid crystal optical rotator devices 111 and 112 have strong anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices 111 and 112; Figures 3 to 5 Provide a detailed description.

[0068] like Figure 3 、 Figure 4 and Figure 5 As shown, in the liquid crystal lens device 100, the first liquid crystal optical rotator 111 is in the off state, the second liquid crystal optical rotator 112 is in the on state, the first liquid crystal lens unit 120 is in the working state, and the second liquid crystal lens unit 130 is in the off state. When the first linearly polarized light passes through the first liquid crystal optical rotator 111, the first liquid crystal optical rotator 111 rotates the polarization direction of the first linearly polarized light by a first predetermined angle and emits a first light polarized in the first direction (the first light is now linearly polarized light with the polarization direction in the first direction). When the first light passes through the second liquid crystal optical rotator 112, if the second liquid crystal optical rotator 112 has weak anchoring energy (such as Figure 4 ), the first light is still linearly polarized in the first direction after passing through the second liquid crystal optical rotator 112; the first light and the first liquid crystal lens unit 120 have the same rubbing direction (both in the first direction), the first liquid crystal lens unit 120 converges (focuses) the first light, and the second liquid crystal lens unit 130 does not converge the first light. At this time, the focal length of the liquid crystal lens device 100 is determined by the first liquid crystal lens unit 120 and has the first focal length. When the first light passes through the second liquid crystal optical rotator 112, if the second liquid crystal optical rotator 112 has a strong anchoring energy (such as Figure 5 ), the first light becomes right-handed elliptically polarized light with its semi-major axis located in the first direction after passing through the second liquid crystal optical rotator 112. However, the vibration component of the first light is still mainly located in the first direction, and the liquid crystal lens device 100 still has the first focal length.

[0069] Figure 6 FIG2 shows another working state schematic diagram of the liquid crystal lens device 100 according to an embodiment of the present invention; Figure 7 Shown Figure 6 In the case where the first and second liquid crystal optical rotator devices 111 and 112 have weak anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices 111 and 112; Figure 8 Shown Figure 6In the case where the first and second liquid crystal optical rotator devices 111 and 112 have strong anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices 111 and 112; Figures 6 to 8 Provide a detailed description.

[0070] like Figure 6 、 Figure 7 and Figure 8 As shown, in the liquid crystal lens device 100, the first liquid crystal lens unit 120 is in the closed state, the second liquid crystal lens unit 130 is in the working state, the first liquid crystal optical rotator 111 is in the open state, and the second liquid crystal optical rotator 112 is in the closed state. Figure 7 ), when the first linearly polarized light passes through the first liquid crystal optical rotator 111, the polarization state remains unchanged. Then, when it passes through the second liquid crystal optical rotator 112, the second liquid crystal optical rotator 112 rotates the polarization direction of the first linearly polarized light by a second predetermined angle and emits a second light (the second light is now linearly polarized light with a second polarization direction). The second light and the second liquid crystal lens unit 130 have the same rubbing direction (both in the second direction). The second liquid crystal lens unit 130 converges (focuses) the second light, while the first liquid crystal lens unit 120 does not converge the second light. At this time, the focal length of the liquid crystal lens device 100 is determined by the second liquid crystal lens unit 130 and has the second focal length. If the first liquid crystal optical rotator 111 has a strong anchoring energy (such as Figure 8 ), when the first linearly polarized light passes through the first liquid crystal optical rotator 111, it becomes left-handed elliptically polarized light with its semi-major axis located in the -45° direction. When the left-handed elliptically polarized light passes through the second liquid crystal optical rotator 112, the second liquid crystal optical rotator 112 rotates the polarization direction of the left-handed circularly polarized light by a second predetermined angle and emits a second light (the second light is now left-handed elliptically polarized light with its semi-major axis located in the second direction). The vibration component of the second light is mainly in the second direction, and the liquid crystal lens device 100 still has the second focal length.

[0071] Figure 9 FIG2 shows another working state schematic diagram of the liquid crystal lens device 100 according to an embodiment of the present invention; Figure 10 Shown Figure 9 In the case where the first and second liquid crystal optical rotator devices 111 and 112 have weak anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices 111 and 112; Figure 11 Shown Figure 9 In the case where the first and second liquid crystal optical rotator devices 111 and 112 have strong anchoring energy, the polarization state of the first linearly polarized light after passing through the first and second liquid crystal optical rotator devices 111 and 112; Figures 9 to 11 Provide a detailed description.

[0072] like Figure 9 、 Figure 10 and Figure 11 As shown, in the liquid crystal lens device 100, the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 are both in the working state, and the first liquid crystal optical rotator 111 and the second liquid crystal optical rotator 112 are both in the open state. Figure 10 ), when the first linearly polarized light passes through the first liquid crystal optical rotator 111, the first liquid crystal optical rotator 111 maintains the polarization direction of the first linearly polarized light unchanged; when the first linearly polarized light passes through the second liquid crystal optical rotator 112, the second liquid crystal optical rotator 112 also maintains the polarization direction of the first linearly polarized light unchanged. Because the first linearly polarized light and the rubbing direction (first direction) of the first liquid crystal lens unit 120 and the rubbing direction (second direction) of the second liquid crystal lens unit 130 have the same angle (e.g., 45°), and these angles are relatively small, both the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 converge the incident light. The focal length of the liquid crystal lens device 100 is determined by the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130, resulting in the liquid crystal lens device 100 having a third focal length. In this embodiment, taking the polarization direction of the first linearly polarized light as -45° as an example, the first linearly polarized light can be considered as the synthesis of two linearly polarized lights with equal amplitudes in the x and y directions and a phase difference of (2k+1)π; if the first liquid crystal optical rotator 111 and the second liquid crystal optical rotator 112 both have strong anchoring energy (such as Figure 11 ). When the first linearly polarized light passes through the first liquid crystal optical rotator 111, it experiences a phase delay of -Δφ, transforming it into left-handed elliptically polarized light with its semi-major axis at -45°. This means the phase difference between the x and y beams becomes (2k+1)π-Δφ. This left-handed elliptically polarized light also experiences a phase delay of Δφ when passing through the second liquid crystal optical rotator 112. This means that after passing through the first and second liquid crystal optical rotators 111 and 112, the actual phase difference is -Δφ+Δφ=0. Consequently, the initial phase difference (2k+1)π is maintained. Therefore, the outgoing light remains the first linearly polarized light, and the liquid crystal lens device 100 maintains the third focal length. When both the first and second liquid crystal optical rotators 111 and 112 are in the on state, there is no significant difference between the first and second liquid crystal optical rotators 111 and 112 having weak or strong anchoring energies.

[0073] According to one embodiment of the present invention, Figure 1As shown, the liquid crystal lens device 100 may further include a control unit electrically connected to the liquid crystal optical rotation component 110, the first liquid crystal lens unit 120, and the second liquid crystal lens unit 130. The control unit is configured to switch the liquid crystal optical rotation component 110 to a first state, a second state, or a third state, and drive the first liquid crystal lens unit 120 and / or the second liquid crystal lens unit 130 to adjust the liquid crystal lens device 100 to a target focal length. Specifically, when the liquid crystal optical rotation component 110 is switched to the first state, the first liquid crystal lens unit 120 is driven with an appropriate voltage to drive the focal length of the first liquid crystal lens unit 120 to the target focal length of the liquid crystal lens device 100. When the liquid crystal optical rotation component 110 is switched to the second state, the second liquid crystal lens unit 130 is driven with an appropriate driving voltage to drive the second liquid crystal lens unit 130 to the target focal length of the liquid crystal lens device 100. When the liquid crystal optical rotation component 110 is switched to the third state, the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 are driven with appropriate driving voltages respectively, so that the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 jointly provide the target focal length of the liquid crystal lens device 100.

[0074] Figure 12 FIG. 2 shows a partial structural diagram of a liquid crystal lens display system 200 according to an embodiment of the present invention. Figure 12 The control unit is not shown in the figure. Figure 12 Provide a detailed description.

[0075] like Figure 12 As shown, the liquid crystal lens display system 200 includes a display module 210 and the liquid crystal lens device 100 described above. The display module 210 is configured to emit image light, which is first linearly polarized light. The liquid crystal lens device 100 is disposed downstream of the optical path of the display module 210 to receive and project the image light (first linearly polarized light). The display module 210 may be a display screen. When the light emitted from the display module 210 is non-linearly polarized light, a polarizer or wave plate may be disposed on the light-emitting side of the display module 210 to convert the light emitted from the display module 210 into linearly polarized light.

[0076] In the liquid crystal lens display system 200, the display module 210 can emit image light, control the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 to operate alternately, and accordingly control the liquid crystal optical rotation component 110 to switch between the first and second states, allowing the liquid crystal lens display system 200 to quickly switch and display images between different focal lengths. Alternatively, the display module 210 can emit image light, switch the liquid crystal optical rotation component 110 to the third state, and accordingly control the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 to operate simultaneously, allowing the liquid crystal lens display system 200 to display images at a smaller focal length.

[0077] Figure 13 A flow chart of a driving method 300 of a liquid crystal lens device according to an embodiment of the present invention is shown. Figure 13 Provide detailed explanation.

[0078] Liquid crystal lens devices such as Figure 1 The illustrated liquid crystal lens device 100 includes a liquid crystal optical rotation component 110, a first liquid crystal lens unit 120, and a second liquid crystal lens unit 130, arranged in sequence. The liquid crystal lens device 100 is configured to receive image light, which is first linearly polarized light. The liquid crystal optical rotation component 110 has a first state, a second state, and a third state, and can rapidly switch between the first, second, and third states. In the first state, the liquid crystal optical rotation component 110 rotates the polarization direction of the first linearly polarized light passing therethrough by a first predetermined angle and emits a first light polarized in the first direction. In the second state, the liquid crystal optical rotation component 110 rotates the polarization direction of the first linearly polarized light passing therethrough by a second predetermined angle and emits a second light polarized in the second direction. In the third state, the liquid crystal optical rotation component 110 maintains the polarization direction of the first linearly polarized light passing therethrough unchanged. The first liquid crystal lens unit 120 is rubbed and aligned in a first direction. Specifically, the first liquid crystal lens unit 120 may include one or more first liquid crystal lenses, which are rubbed and aligned in the first direction. The focal length of the first liquid crystal lens unit 120 can be adjusted based on the driving voltage applied to the first liquid crystal lens unit 120. The second liquid crystal lens unit 130 is rubbed and aligned along the second direction. Specifically, the second liquid crystal lens unit 130 may include one or more second liquid crystal lenses. The second liquid crystal lenses are rubbed and aligned along the second direction. The focal length of the second liquid crystal lens unit 130 can be adjusted according to the driving voltage applied to the second liquid crystal lens unit 130.

[0079] The liquid crystal optical rotator assembly 110 includes a first liquid crystal optical rotator 111 and a second liquid crystal optical rotator 112, each of which has an on state and an off state. The first liquid crystal optical rotator 111 can be, for example, a chiral left-handed liquid crystal optical rotator. When on, it maintains the polarization direction of first linearly polarized light passing through it unchanged. When off, it rotates the polarization direction of the first linearly polarized light passing through it by a first preset angle before emitting it. The second liquid crystal optical rotator 112 can be, for example, a chiral right-handed liquid crystal optical rotator. When on, it maintains the polarization direction of first linearly polarized light passing through it unchanged. When off, it rotates the polarization direction of the first linearly polarized light passing through it by a second preset angle before emitting it. When the first liquid crystal optical rotator 111 is off and the second liquid crystal optical rotator 112 is on, the liquid crystal optical rotator assembly 110 is in the first state. When the first liquid crystal optical rotator 111 is in the on state and the second liquid crystal optical rotator 112 is in the off state, the liquid crystal optical rotator assembly 110 is in the second state. When both the first liquid crystal optical rotator 111 and the second liquid crystal optical rotator 112 are in the on state, the liquid crystal optical rotator assembly 110 is in the third state.

[0080] like Figure 13 As shown, the driving method 300 includes the following steps. Each step in the driving method 300 can be performed according to Figure 13 The steps are performed sequentially in the order shown, or simultaneously according to actual conditions, which is not limited here. The following describes each step of the driving method 300 in detail.

[0081] In step S310, the liquid crystal optical rotator assembly 110 is switched to a first state, a second state, or a third state. The liquid crystal optical rotator assembly 110 can be switched to the first state by switching the first liquid crystal optical rotator device 111 to an off state and the second liquid crystal optical rotator device 112 to an on state. The liquid crystal optical rotator assembly 110 can be switched to the second state by switching the first liquid crystal optical rotator device 111 to an on state and the second liquid crystal optical rotator device 112 to an off state. The liquid crystal optical rotator assembly 110 can be switched to the third state by switching both the first liquid crystal optical rotator device 111 and the second liquid crystal optical rotator device 112 to an on state.

[0082] In step S320, the first liquid crystal lens unit 120 and / or the second liquid crystal lens unit 130 are driven to adjust the liquid crystal lens device 100 to the target focal length. When the liquid crystal optical rotation component 110 is switched to the first state, the first liquid crystal lens unit 120 is driven with an appropriate driving voltage to adjust the liquid crystal lens device 100 to the target focal length. When the liquid crystal optical rotation component 110 is switched to the second state, the second liquid crystal lens unit 130 is driven with an appropriate driving voltage to adjust the liquid crystal lens device 100 to the target focal length. When the liquid crystal optical rotation component 110 is switched to the third state, the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 are driven with an appropriate driving voltage to adjust the liquid crystal lens device 100 to the target focal length.

[0083] Compared to the prior art, embodiments of the present invention provide a liquid crystal lens device 100, a liquid crystal lens display system 200, and a driving method 300. By configuring the first and second liquid crystal lens units 120, 130 in conjunction with the liquid crystal optical rotation assembly 110, not only can rapid switching between different focal lengths be achieved, but also shorter focal lengths or larger diopters can be achieved. For example, when rapid switching between different focal lengths is required, the first and second liquid crystal lens units 120, 130 can be controlled to operate alternately, and the liquid crystal optical rotation assembly 110 can be switched between the first and second states accordingly. In this case, the zoom response time of the liquid crystal lens device 100 is only affected by the driving voltages of the first and second liquid crystal lens units 120, 130. Furthermore, by adjusting the driving voltages, the response time of the liquid crystal lens device 100 switching between different focal lengths can be kept consistent, thereby improving the display quality of the liquid crystal lens device 100. For another example, the first liquid crystal lens unit 120 and the second liquid crystal lens unit 130 may be controlled to operate simultaneously, and the liquid crystal optical rotation component 110 may be adjusted to the third state to achieve a shorter focal length or a larger diopter.

[0084] Finally, it should be noted that the above descriptions are merely embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A liquid crystal lens device, comprising: A liquid crystal optical rotator component has a first state, a second state, and a third state. In the first state, the liquid crystal optical rotator component rotates the polarization direction of first linearly polarized light passing therethrough by a first preset angle and emits a first light polarized in the first direction. In the second state, the liquid crystal optical rotator component rotates the polarization direction of the first linearly polarized light passing therethrough by a second preset angle and emits a second light polarized in the second direction. In the third state, the liquid crystal optical rotator component maintains the polarization direction of the first linearly polarized light passing therethrough unchanged. A first liquid crystal lens unit is disposed downstream of the optical path of the liquid crystal optical rotation component, wherein the first liquid crystal lens unit is rubbed and aligned along a first direction; and a second liquid crystal lens unit disposed downstream of the optical path of the first liquid crystal lens unit, wherein the second liquid crystal lens unit is rubbed and aligned along a second direction; The first direction and the second direction have an included angle of 70-90°, and the first preset angle and the second preset angle have the same magnitude and opposite directions.

2. The liquid crystal lens device according to claim 1, wherein The liquid crystal optical rotation component comprises: a first liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the first preset angle and emits the light; and a second liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the second preset angle and emits the light; The first liquid crystal optical rotator device and the second liquid crystal optical rotator device are arranged in an overlapping manner. The first liquid crystal optical rotator device is a chiral left-handed liquid crystal optical rotator device, and the second liquid crystal optical rotator device is a chiral right-handed liquid crystal optical rotator device. When the first liquid crystal optical rotator device is in an off state and the second liquid crystal optical rotator device is in an on state, the liquid crystal optical rotator component is in a first state; when the first liquid crystal optical rotator device is in an on state and the second liquid crystal optical rotator device is in an off state, the liquid crystal optical rotator component is in a second state; when both the first liquid crystal optical rotator device and the second liquid crystal optical rotator device are in an on state, the liquid crystal optical rotator component is in a third state.

3. The liquid crystal lens device according to claim 1, wherein The first liquid crystal lens unit includes one or more first liquid crystal lenses; the second liquid crystal lens unit includes one or more second liquid crystal lenses.

4. The liquid crystal lens device according to any one of claims 1 to 3, further comprising a control unit electrically connected to the liquid crystal optical rotation component, the first liquid crystal lens unit, and the second liquid crystal lens unit, respectively, the control unit being configured to switch the liquid crystal optical rotation component to the first state, the second state, or the third state, and to drive the first liquid crystal lens unit and / or the second liquid crystal lens unit to adjust the liquid crystal lens device to a target focal length.

5. The liquid crystal lens device according to claim 4, wherein The control unit is configured to: when the liquid crystal optical rotation component is switched to the first state, drive the first liquid crystal lens unit to drive the focal length of the first liquid crystal lens unit to the target focal length of the liquid crystal lens device; When the liquid crystal optical rotation component is switched to the second state, driving the second liquid crystal lens unit to drive the second liquid crystal lens unit to a target focal length of the liquid crystal lens device; When the liquid crystal optical rotation component is switched to the third state, the first liquid crystal lens unit and the second liquid crystal lens unit are driven to jointly provide the target focal length of the liquid crystal lens device through the first liquid crystal lens unit and the second liquid crystal lens unit.

6. The liquid crystal lens device according to claim 2, wherein: For both the first liquid crystal optical rotator device and the second liquid crystal optical rotator device, the product of the cell thickness and the liquid crystal refractive index anisotropy satisfies the requirement that the product is an integer multiple of the wavelength of the first linearly polarized light.

7. A liquid crystal lens display system comprising: A display module is used to emit image light, wherein the image light is a first linearly polarized light. ； The liquid crystal lens device according to any one of claims 1 to 6, wherein the liquid crystal lens device is arranged downstream of the optical path of the display module to receive and project the first linearly polarized light.

8. A method for driving a liquid crystal lens device, wherein: The liquid crystal lens device includes a liquid crystal optical rotation component, a first liquid crystal lens unit and a second liquid crystal lens unit, and the driving method includes: Switching the liquid crystal optical rotation component to a first state, a second state, or a third state, wherein in the first state, the liquid crystal optical rotation component rotates the polarization direction of the first linearly polarized light passing therethrough by a first preset angle and emits a first light polarized along the first direction; in the second state, the liquid crystal optical rotation component rotates the polarization direction of the first linearly polarized light passing therethrough by a second preset angle and emits a second light polarized along the second direction; in the third state, the liquid crystal optical rotation component maintains the polarization direction of the first linearly polarized light passing therethrough unchanged; driving the first liquid crystal lens unit and / or the second liquid crystal lens unit to adjust the liquid crystal lens device to a target focal length; The first direction and the second direction have an included angle of 70-90°, and the first preset angle and the second preset angle have the same magnitude and opposite directions.

9. The driving method according to claim 8, wherein: The liquid crystal optical rotation component comprises: a first liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the first preset angle and emits the light; and a second liquid crystal optical rotator, having an on state and an off state, wherein in the on state, the first liquid crystal optical rotator maintains the polarization direction of the first linearly polarized light passing therethrough unchanged, and in the off state, the first liquid crystal optical rotator rotates the polarization direction of the first linearly polarized light passing therethrough by the second preset angle and emits the light; In the step of switching the liquid crystal optical rotator component to the first state, the second state, or the third state, the liquid crystal optical rotator component is switched to the first state by switching the first liquid crystal optical rotator device to the off state and the second liquid crystal optical rotator device to the on state; the liquid crystal optical rotator component is switched to the second state by switching the first liquid crystal optical rotator device to the on state and the second liquid crystal optical rotator device to the off state; and the liquid crystal optical rotator component is switched to the third state by switching both the first liquid crystal optical rotator device and the second liquid crystal optical rotator device to the on state.

10. The driving method according to claim 8, wherein: When the liquid crystal optical rotation component is switched to the first state, the first liquid crystal lens unit is driven to adjust the liquid crystal lens device to the target focal length; when the liquid crystal optical rotation component is switched to the second state, the second liquid crystal lens unit is driven to adjust the liquid crystal lens device to the target focal length; when the liquid crystal optical rotation component is switched to the third state, the first liquid crystal lens unit and the second liquid crystal lens unit are driven to adjust the liquid crystal lens device to the target focal length.

11. The driving method according to claim 8, wherein: The liquid crystal lens device is configured to receive first linearly polarized light; the first liquid crystal lens unit is rubbed and aligned along a first direction, and the second liquid crystal lens unit is rubbed and aligned along a second direction, the first liquid crystal lens unit includes one or more first liquid crystal lenses, and the second liquid crystal lens unit includes one or more second liquid crystal lenses.

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