WO2020248720A1 - Liquid crystal lens and liquid crystal glasses - Google Patents

Abstract

A liquid crystal lens comprises: a first transparent substrate (100), a second transparent substrate (200) opposite to the first transparent substrate (100), and a liquid crystal layer (300) located between the first transparent substrate (100) and the second transparent substrate (200); a Fresnel lens (600) located between the first transparent substrate (100) and the liquid crystal layer (300); and a compensation lens (700) located between the Fresnel lens (600) and the first transparent substrate (100). The side of the Fresnel lens (600) facing the liquid crystal layer (300) is provided with notches (623) distributed at intervals of a Fresnel zone, the compensation lens (700) directly facing the positions of the Fresnel lens (600) having different thicknesses has different dielectric constants, and the dielectric constant of the compensation lens (700) is configured to be negatively related to the thickness of the Fresnel lens (600) at the position to which the compensation lens (700) directly faces. By the design of matching the dielectric constant of the compensation lens (700) with the thickness of the Fresnel lens (600), it is possible to solve as much as possible the problem of uneven electric field distribution caused by different thicknesses of the Fresnel lens (600) when an intermediate state voltage is applied to the first transparent electrode (400), so that liquid crystal deflection is roughly uniform. Also disclosed is a pair of liquid crystal glasses.

Description

Liquid crystal lens and liquid crystal glasses

This application claims the priority of the Chinese patent application No. 201910500411.X filed on June 11, 2019, and the contents of the above-mentioned Chinese patent application are quoted here in full as a part of this application.

Technical field

At least one embodiment of the present disclosure relates to a liquid crystal lens and liquid crystal glasses.

Background technique

Liquid crystals have large optical anisotropy and have been widely used in various optical devices. Liquid crystal glasses are another research hotspot after liquid crystal displays, including single round electrode liquid crystal glasses, pattern electrode liquid crystal glasses, and embossed shape liquid crystal glasses.

Summary of the invention

At least one embodiment of the present disclosure provides a liquid crystal lens and liquid crystal glasses.

At least one embodiment of the present disclosure provides a liquid crystal lens, including: a first transparent substrate, a second transparent substrate opposite to the first transparent substrate, and located between the first transparent substrate and the second transparent substrate Between the liquid crystal layer; the Fresnel lens between the first transparent substrate and the liquid crystal layer; and the compensation lens between the Fresnel lens and the first transparent substrate. The side of the Fresnel lens facing the liquid crystal layer is provided with grooves distributed at intervals of the Fresnel zone, and the dielectric constant of the compensation lens directly opposite to the Fresnel lens at different thicknesses is different , And the dielectric constant of the compensation lens is configured to be negatively correlated with the thickness of the Fresnel lens at the opposite position.

For example, the liquid crystal lens further includes: a first transparent electrode located between the compensation lens and the first transparent substrate, and a second transparent electrode located between the liquid crystal layer and the second transparent substrate.

For example, the Fresnel lens includes a first central portion and a plurality of first annular portions surrounding the first central portion, from the center of the orthographic projection of the first central portion on the first transparent substrate In the direction toward the edge, the thickness of each of the first annular portion and the first central portion gradually changes, and the thicknesses of the two have the same changing trend; the compensation lens includes a second central portion and surrounding the first central portion A plurality of second annular parts at two central parts, the orthographic projection of the first central part on the first transparent substrate coincides with the orthographic projection of the second central part on the first transparent substrate, so The orthographic projection of the first ring-shaped portion on the first transparent substrate and the orthographic projection of the second ring-shaped portion on the first transparent substrate coincide in a one-to-one correspondence, and the second center portion is interposed The electrical constant is configured to be inversely related to the thickness of the first central portion at the facing position, and the dielectric constant of the second ring-shaped portion is configured to be the same as that of the first ring-shaped portion at the facing position. The thickness is negatively correlated.

For example, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, the thickness of each of the first annular portion and the first central portion gradually increases, And the dielectric constant of each of the second annular portion and the second central portion gradually decreases.

For example, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, the thickness of each of the first annular portion and the first central portion gradually decreases, And the dielectric constant of each of the second annular portion and the second central portion gradually increases.

For example, the orthographic projection of the first central portion on the first transparent substrate is a circle, and the direction in which the center of the orthographic projection of the first central portion on the first transparent substrate points to the edge is the circle The radial direction of the shape.

For example, the first central part and the plurality of first annular parts surrounding the first central part are an integral structure; the second central part and the plurality of first annular parts surrounding the second central part are integrated The two ring parts are an integral structure.

For example, in a direction perpendicular to the main plane of the first transparent substrate, the ratio of the maximum thickness of the first central portion to the maximum thickness of at least one of the plurality of first annular portions is 0.9 to 1.1, and The ratio of the minimum thickness of the first central portion to the minimum thickness of at least one of the plurality of first annular portions is 0.9-1.1.

For example, in a direction perpendicular to the main plane of the first transparent substrate, the maximum thickness of each of the first annular portions is the same, and the minimum thickness of each of the first annular portions is the same.

For example, the compensation lens includes cured liquid crystal.

For example, the liquid crystal in the compensation lens is a positive liquid crystal.

For example, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, the thickness of each of the first annular portion and the first central portion gradually increases, The liquid crystal molecules in each of the second annular portion and the second central portion gradually change from a deflection direction parallel to the main plane of the first transparent substrate to a deflection direction perpendicular to the main plane of the first transparent substrate Or, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, the thickness of each of the first annular portion and the first central portion are gradually reduced , The liquid crystal molecules in each of the second annular portion and the second central portion gradually change from a deflection direction perpendicular to the principal plane of the first transparent substrate to a deflection parallel to the principal plane of the first transparent substrate direction.

For example, the liquid crystal in the compensation lens includes a plurality of liquid crystal rings surrounding the central axis of the compensation lens, and the included angles between the liquid crystal molecules in the same liquid crystal ring and the central axis are the same.

For example, the equivalent refractive index of the second central portion is configured to be negatively correlated with the thickness of the first central portion at the position directly opposite, and the equivalent refractive index of the second annular portion is configured to be related to the positive The thickness of the first annular portion at the position is negatively correlated.

For example, the compensation lens includes two surfaces opposite to each other, the two surfaces are both parallel to the main plane of the first transparent substrate, and the surface of the Fresnel lens facing the compensation lens is parallel to The main plane of the first transparent substrate.

For example, along the direction perpendicular to the main plane of the first transparent substrate, the thickness of the compensation lens is 0.5-25 microns.

For example, the refractive index of the liquid crystal in the liquid crystal layer is configured to vary between a first refractive index n1 and a second refractive index n2, and the refractive index n0 of the Fresnel lens satisfies: n1≥n0≥n2.

At least one embodiment of the present disclosure provides a liquid crystal glasses including the above liquid crystal lens.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the following will briefly introduce the drawings of the embodiments. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limit the present disclosure. .

1A is a schematic diagram of a partial cross-sectional structure of liquid crystal glasses;

1B is a schematic plan view of the liquid crystal glasses shown in FIG. 1A taken along line AA;

1C is an enlarged schematic diagram of the deflection state of liquid crystal molecules in the region 1 above the center of the Fresnel lens when an intermediate state voltage is applied to the first transparent electrode shown in FIG. 1A;

2A is a schematic partial cross-sectional view of a liquid crystal lens provided by an example of an embodiment of the present disclosure;

2B is a schematic plan view of the compensation lens shown in FIG. 2A taken along line BB;

3A is a liquid crystal lens provided by an example of an embodiment of the present disclosure;

3B is a schematic diagram of a planar structure of liquid crystal molecules in the second ring portion shown in FIG. 3A;

3C is an equivalent structure diagram of the compensation lens shown in FIG. 3A;

4A is a schematic diagram of a cross-sectional structure of a liquid crystal lens provided by another example of an embodiment of the present disclosure;

Fig. 4B is an equivalent structural diagram of the compensation lens shown in Fig. 4A; and

5 is a schematic diagram of the deflection state of liquid crystal molecules in the liquid crystal layer in the region above the first center portion of the Fresnel lens when the intermediate state voltage is applied to the first transparent electrode in the examples shown in FIGS. 2A-3B.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present disclosure.

Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity, or importance, but are only used to distinguish different components. "Include" or "include" and other similar words mean that the element or item appearing before the word encompasses the element or item listed after the word and its equivalents, but does not exclude other elements or items.

1A is a schematic partial cross-sectional structure diagram of a liquid crystal glasses, and FIG. 1B is a schematic plan view of the liquid crystal glasses shown in FIG. 1A taken along line AA. As shown in FIG. 1A, the liquid crystal glasses include a first transparent substrate 10, a second transparent substrate 20, and a liquid crystal layer 30 located between the first transparent substrate 10 and the second transparent substrate 20, which are arranged opposite to each other. The side of the first transparent substrate 10 facing the second transparent substrate 20 is provided with a whole-surface first transparent electrode 40, and the side of the second transparent substrate 20 facing the first transparent substrate 10 is provided with a whole-surface second transparent electrode 50, A Fresnel lens 60 is provided between the first transparent electrode 40 and the liquid crystal layer 30.

As shown in FIGS. 1A and 1B, the first surface 61 of the Fresnel lens 60 facing the first transparent electrode 40 may be a flat surface parallel to the first transparent substrate 10, and the Fresnel lens 60 faces the liquid crystal layer 30. The second surface 62 on the side is provided with tooth patterns, that is, the side of the Fresnel lens 60 facing the liquid crystal layer 30 is provided with grooves distributed at intervals of the Fresnel zone. The Fresnel wave zone is composed of a circle in the center and a plurality of rings arranged concentrically with the circle. The circle and each ring are a wave zone of the Fresnel wave zone. The Fresnel lens 60 includes a center portion 63 corresponding to the circle of the Fresnel zone center and an annular portion 64 corresponding to the ring shape of the Fresnel zone.

The liquid crystal in the liquid crystal layer 30 has a birefringence, the refractive index of the liquid crystal in the power-off state is an abnormal light refractive index, and the refractive index in the power-on state is the normal light refractive index. For example, the liquid crystal is a positive light liquid crystal, and its abnormal light refractive index is greater than the normal light refractive index. For example, the refractive index of normal light is about 1.5, and the refractive index of abnormal light is about 1.6 to 1.8. For the Fresnel lens 60, for example, a material having a refractive index substantially equal to the extraordinary light refractive index of the liquid crystal can be selected.

For example, the liquid crystal can be a rod-shaped liquid crystal. The liquid crystal is in a horizontal state when the power is off, that is, the long axis of the liquid crystal molecule is parallel to the first transparent substrate 10 (as shown in FIG. 1A). The liquid crystal is in a vertical state when the power is on, that is, the liquid crystal The long axis of the molecule is perpendicular to the first transparent substrate 10.

For example, when the voltages of the first transparent electrode 40 and the second transparent electrode 50 are both 0V, the liquid crystal is in a power-off state, and its refractive index is approximately equal to the refractive index of the Fresnel lens 60, so that the liquid crystal layer 30 and the Fresnel lens The lens 60 is equivalent to a flat dielectric layer. The parallel light (such as linearly polarized light) incident on the liquid crystal glasses from the first transparent substrate 10 will not change the propagation direction, that is, the light emitted from the second transparent substrate 20 is still parallel light.

For example, when a high voltage is applied to the first transparent electrode 40, the liquid crystal layer is under a strong electric field, the deflection of liquid crystal molecules in the liquid crystal layer is uniform, and the refractive index of the liquid crystal layer 30 is smaller than the refractive index of the Fresnel lens 60. The parallel light incident on the liquid crystal glasses from the first transparent substrate 10 is condensed at the interface between the Fresnel lens 60 and the liquid crystal layer 30, and the liquid crystal glasses at this time function as a condensing lens. In this way, the liquid crystal glasses can be switched between the light gathering and transmission functions.

The structure shown in FIG. 1A is equivalent to a Fresnel lens structure, which is equivalent to a Fresnel lens structure by controlling the deflection of the liquid crystal by an electric field to control the arrangement of the liquid crystal, which can avoid the difficulty of forming the Fresnel period by controlling the liquid crystal deflection through the electrode. Achieve precise control and cause great crosstalk problems.

During the research, the inventor of the present application found that when an intermediate state voltage (for example, a voltage of 3.5V) is applied to the first transparent electrode, the difference in thickness at different positions of the Fresnel lens will result in the effect on different positions in the liquid crystal layer. The uneven distribution of the electric field on the liquid crystal molecules. Under the action of the external electric field generated by the intermediate state voltage, the induced electric field generated at the position of the greater the thickness of the Fresnel lens will weaken the external electric field. Therefore, the greater the thickness of the Fresnel lens, the weaker the electric field strength acting on the liquid crystal molecules, which results in uneven deflection of the liquid crystal molecules in the liquid crystal layer on the Fresnel lens with different thicknesses. FIG. 1C is an enlarged schematic diagram of the deflection state of liquid crystal molecules in the region 1 above the center of the Fresnel lens when an intermediate state voltage is applied to the first transparent electrode. As shown in FIG. 1C, taking the liquid crystal layer located in the center of the Fresnel lens as an example, the liquid crystal molecules in the region 2 above the thinner position in the center 63 are basically in a normal deflection state (perpendicular to the first transparent Substrate), the portion of the liquid crystal molecules in the region 3 above the thicker position in the central portion 63 is still in an undeflected state (parallel to the first transparent substrate). At this time, the refractive index of each position of the liquid crystal layer is not uniform, and stray light will appear, resulting in blurred imaging. Therefore, the liquid crystal in the liquid crystal glasses shown in FIG. 1A can only be at two different refractive indexes, and the continuous change of the refractive index cannot be realized, and the power of the glasses cannot be adjusted.

The embodiments of the present disclosure provide a liquid crystal lens and liquid crystal glasses. The liquid crystal lens includes a first transparent substrate, a second transparent substrate opposite to the first transparent substrate, a liquid crystal layer located between the first transparent substrate and the second transparent substrate, and a phenanthrene layer on the side of the first transparent substrate facing the liquid crystal layer. The Neel lens and the compensation lens between the Fresnel lens and the first transparent substrate. The side of the Fresnel lens facing the liquid crystal layer is provided with grooves distributed at intervals of the Fresnel zone. The dielectric constant of the compensation lens opposite to the Fresnel lens at different thicknesses is different, and the dielectric constant of the compensation lens It is configured to have a negative correlation with the thickness of the Fresnel lens at the position directly opposite. In the embodiments of the present disclosure, the dielectric constant of the compensation lens is designed to match the thickness of the Fresnel lens, so that when the intermediate state voltage is applied to the first transparent electrode, the effect on the liquid crystal caused by the different thickness of the Fresnel lens can be compensated as much as possible. The problem of uneven electric field distribution on the layer, so that the deflection of the liquid crystal molecules in the liquid crystal layer is roughly uniform, and the continuous adjustment of the power of the liquid crystal lens is realized to increase the zoom power range of the liquid crystal lens and improve the image quality.

The liquid crystal lenses and liquid crystal glasses provided by the embodiments of the present disclosure will be described below with reference to the accompanying drawings.

At least one embodiment of the present disclosure provides a liquid crystal lens. FIG. 2A is a schematic partial cross-sectional view of a liquid crystal lens provided by an example of an embodiment of the present disclosure. As shown in FIG. 2A, the liquid crystal lens includes: a first transparent substrate 100, a second transparent substrate 200 arranged in parallel to the first transparent substrate 100, and a liquid crystal layer 300 located between the first transparent substrate 100 and the second transparent substrate 200 , The first transparent electrode 400 between the first lens substrate 100 and the second transparent substrate 200, and the second transparent electrode 500 between the second transparent substrate 200 and the first transparent substrate 100.

For example, the material of the first transparent substrate 100 and the second transparent substrate 200 may be glass transparent substrates, or transparent materials such as polydimethylsiloxane (PDMS) or polymethylmethacrylate (PMMA) may be used to avoid The first transparent substrate 100 and the second transparent substrate 200 affect the transmittance of light.

For example, the material of the first transparent electrode 400 and the second transparent electrode 500 may be a transparent conductive metal oxide or a transparent conductive organic polymer material. For example, the material of the first transparent electrode 400 and the second transparent electrode 500 may be indium tin oxide or indium zinc oxide to ensure the transparency of the two transparent electrodes. For example, the thickness of the first transparent electrode 400 in a direction perpendicular to the first transparent substrate 100 may be 0.04 μm-0.07 μm.

For example, as shown in FIG. 2A, the liquid crystal lens further includes a Fresnel lens 600 on the side of the first transparent substrate 100 facing the liquid crystal layer 300. The Fresnel lens 600 includes flat first surfaces 610 opposite to each other and The second surface 620 of the tooth pattern and the tooth patterns provided on the second surface 620 of the Fresnel lens 600 are structures distributed at intervals of the Fresnel zone. That is, the side of the Fresnel lens 600 facing the liquid crystal layer 300 is provided with grooves 623 distributed at intervals of the Fresnel zone. The liquid crystal layer 300 is located on a side of the second surface 620 of the Fresnel lens 600 away from the first surface 610. The Fresnel lens 600 includes a first central portion 621 corresponding to the center circle of the Fresnel zone, and a plurality of first ring portions 622 surrounding the first central portion 621. The first ring portions 622 are connected to the Fresnel zone. The ring correspondence of the wave band. For example, the first central portion 621 and the first annular portion 622 have a concentric structure. The above-mentioned first ring portion 622 is the lens structure between the grooves 623.

For example, as shown in FIG. 2A, the orthographic projection of the first central portion 621 on the first transparent substrate 100 is a circle, pointing from the center of the circle to the circumferential direction (for example, the X1 and X2 directions shown in FIG. 2A), The thickness of the first central portion 621 gradually changes, the thickness of each first annular portion 622 gradually changes, and the thickness change trend of the first central portion 621 is the same as the thickness change trend of each first annular portion 622. The embodiments of the present disclosure schematically show that the orthographic projection of the first central portion on the first transparent substrate is a circle, and at this time, the orthographic projection of the first annular portion on the first transparent substrate is a circular ring. But it is not limited to this. The orthographic projection of the first central portion on the first transparent substrate can also be in the shape of a strip, rectangle, etc. At this time, the orthographic projection of the first ring portion on the first transparent substrate is a strip ring or rectangle. Ring etc.

For example, in the example shown in FIG. 2A, the thickness of the first central portion 621 gradually increases from the center of the circle to the circumference, that is, the thickness of the portion of the first central portion 621 closer to the first annular portion 622 is Large, the second surface 620 of the first central portion 621 of the Fresnel lens 600 is concave. From approaching the first central portion 621 to a direction away from the first central portion 621, the thickness of each first annular portion 622 gradually increases. That is, from the center of the circle to the direction of the circumference, the depth of the groove 623 at the position of the first central portion 621 gradually decreases, and the depth of the groove 623 at the position of each first annular portion 622 gradually decreases. Decrease.

For example, from the center of the circle to the direction of the circumference, the size of the first annular portion 622 is not less than 25 μm. For example, the radius of the circle in the Fresnel wave zone satisfies r _i =(ifλ) ^1/2 , i is the number of the circle in the Fresnel wave zone (from the center of the Fresnel wave zone to the circumference, the number Gradually increase), f is the focal length of the Fresnel lens, λ is the wavelength of incident light, then the size of the i-1th (the second circle corresponds to the first ring) of the first ring 622 d= r _i -r _i-1 .

For example, the first central portion 621 of the Fresnel lens 600 and the plurality of first annular portions 622 are an integral structure. For example, as shown in FIG. 2A, the position where the thickness of the first central portion 621 is thickest is connected to the position where the thickness of the first annular portion 622 closest to the first central portion 621 is the thinnest. For example, two adjacent first ring portions 622 are connected to each other.

For example, in the direction perpendicular to the main plane of the first transparent substrate 100, the ratio of the maximum thickness of the first central portion 621 to the maximum thickness of at least one of the plurality of first annular portions 622 is 0.9 to 1.1, and the first center The ratio of the minimum thickness of the portion 621 to the minimum thickness of at least one of the plurality of first annular portions 622 is 0.9-1.1. For example, along the direction perpendicular to the main plane of the first transparent substrate 100, the maximum thickness of the first central portion 621 is equal to the maximum thickness of each first annular portion 622, and the minimum thickness of the first central portion 621 is equal to the maximum thickness of each first annular portion 622. The minimum thickness of the ring portion 622 is the same, so that it is convenient to set the dielectric constant of the compensation lens.

For example, along the direction perpendicular to the main plane of the first transparent substrate 100, the maximum thickness of each first ring portion 622 is the same, and the minimum thickness of each first ring portion 622 is the same, so as to facilitate the compensation of the dielectric constant of the lens Set up.

As shown in FIG. 2A, the liquid crystal lens further includes a compensation lens 700 located between the Fresnel lens 600 and the first transparent substrate 100, and the first transparent electrode 400 is located between the compensation lens 700 and the first transparent substrate 100. The dielectric constant of the compensation lens 700 opposite to the Fresnel lens 600 at a different thickness is different, and the dielectric constant of the compensation lens 700 is configured to be negatively correlated with the thickness of the Fresnel lens 600 at the opposite position. The above-mentioned Fresnel lens at the position directly opposite to the compensation lens refers to, for example, the position Q of the Fresnel lens 600 directly opposite to the position P of the compensation lens 700 shown in FIG. 2A. The positions P and Q are located perpendicular to the first position. A lens substrate 100 is on the same line. In the embodiments of the present disclosure, the "right facing" of the two structures means that the two structures are located on the same straight line along the Y direction.

For example, along the direction perpendicular to the first transparent substrate 100, the dielectric constant of the compensation lens 700 corresponding to the Fresnel lens 600 decreases as the thickness of the Fresnel lens 600 increases, that is, the The compensation lens 700 facing the position where the thickness of the lens 600 is large has a small dielectric constant. That is, the dielectric constant of the compensation lens directly below the Fresnel lens decreases as the thickness of the Fresnel lens increases.

In the embodiments of the present disclosure, the compensation lens is arranged on the side of the Fresnel lens away from the liquid crystal layer, and the dielectric constant of the compensation lens is set according to the thickness change rule of the Fresnel lens, so that the liquid crystal molecules in the liquid crystal layer can be compensated as much as possible. The electric field, so that the deflection of the liquid crystal molecules is roughly uniform, and the continuous change of the refractive index of the liquid crystal and the continuous adjustment of the degree of the liquid crystal lens can be realized.

For example, FIG. 2B is a schematic plan view of the compensation lens shown in FIG. 2A taken along line BB. As shown in FIGS. 2A and 2B, the compensation lens 700 includes a second central part 710 and a plurality of second annular parts 720 surrounding the second central part 710. The orthographic projection of the second central portion 710 on the first transparent substrate 100 is, for example, a circle, pointing from the center of the circle to the direction of the circumference (for example, the X1 and X2 directions shown in FIG. 2A). The dielectric constant gradually changes, the dielectric constant of each second ring portion 720 gradually changes, and the change trend of the dielectric constant of the second central portion 710 is the same as the change trend of the dielectric constant of each second ring portion 720.

For example, as shown in FIGS. 2A and 2B, the orthographic projection of the first central portion 621 on the first transparent substrate 100 coincides with the orthographic projection of the second central portion 710 on the first transparent substrate 100. For example, the center of the circular orthographic projection of the first central portion 621 coincides with the center of the circular orthographic projection of the second central portion 710, and the radii of the two circular orthographic projections are approximately equal. The above-mentioned "the orthographic projection of the first central portion 621 on the first transparent substrate 100 coincides with the orthographic projection of the second central portion 710 on the first transparent substrate 100" may mean that the overlapping area of the two orthographic projections occupies any one of the orthographic projection areas. More than 95%.

For example, the orthographic projection of the first annular portion 622 on the first transparent substrate 100 and the orthographic projection of the second annular portion 720 on the first transparent substrate 100 coincide in a one-to-one correspondence. The number of the first ring-shaped portions 622 is the same as the number of the second ring-shaped portions 720, and there is a one-to-one correspondence.

For example, the second central portion 710 and the plurality of second annular portions 720 surrounding the second central portion 710 are an integral structure.

For example, the dielectric constant of the second central portion 710 is configured to be negatively correlated with the thickness of the first central portion 621 at the position directly opposite.

For example, as shown in FIG. 2A, when the thickness of the first central portion 621 gradually increases in the direction from the center of the circle to the circumference, the dielectric constant of the second central portion 710 gradually decreases. When an intermediate state voltage (for example, 3.5V voltage) is applied to the first transparent electrode, the electric field acting on the liquid crystal layer located at the edge of the first central portion is smaller than the electric field acting on the liquid crystal layer located at the center of the first central portion; The electric field of the liquid crystal layer at the edge of the second central part is greater than the electric field acting on the liquid crystal layer at the center of the second central part. That is, the influence of the Fresnel lens and the compensation lens on the electric field acting on the liquid crystal layer at the same position is opposite to realize the electric field compensation. Therefore, the design of the dielectric constant of the second central part to match the thickness of the first central part can compensate the unevenly distributed electric field caused by the thickness of the Fresnel lens as much as possible when the intermediate state voltage is applied to the first transparent electrode, so that The deflection of the liquid crystal molecules is approximately uniform, thereby realizing the continuous change of the refractive index of the liquid crystal and the continuous adjustment of the degree of the liquid crystal lens.

Similarly, the dielectric constant of the second annular portion 720 is configured to be negatively correlated with the thickness of the first annular portion 622 at the position directly opposite.

For example, as shown in FIG. 2A, from the center of the circle to the direction of the circumference, the thickness of each first ring portion 622 gradually increases, and the dielectric constant of each second ring portion 720 gradually decreases . Therefore, when an intermediate state voltage (for example, a voltage of 3.5V) is applied to the first transparent electrode, the electric field acting on the part of the liquid crystal molecules in the liquid crystal layer located near the first center portion of the first ring is smaller than that acting on the first transparent electrode. The electric field of part of the liquid crystal molecules in the liquid crystal layer where the ring part is far away from the first center part; and the electric field acting on the liquid crystal molecules in the liquid crystal layer located in the second ring part close to the second center part is greater than that applied to the liquid crystal molecules in the second ring part Part away from the electric field of the liquid crystal molecules in the liquid crystal layer of the second central part. That is, the influence of the Fresnel lens and the compensation lens on the electric field acting on the liquid crystal layer at the same position is opposite to realize the electric field compensation. Therefore, the design of the dielectric constant of the compensation lens to match the thickness of the Fresnel lens can try to solve the problem of uneven electric field distribution caused by the thickness of the Fresnel lens when the intermediate state voltage is applied to the first transparent electrode, so as to make the liquid crystal The deflection is approximately uniform, thereby realizing the continuous change of the refractive index of the liquid crystal and the continuous adjustment of the degree of the liquid crystal lens.

For example, the side of the second transparent electrode 500 facing the liquid crystal layer 300 and the side of the Fresnel lens 600 facing the liquid crystal layer 300 are respectively provided with alignment films (not shown in the figure) with the same alignment direction, so that the liquid crystal is not exposed to The optical axis is parallel to the first transparent substrate 100 when the electric field is applied.

For example, FIG. 3A is a liquid crystal lens provided by an example of an embodiment of the disclosure. As shown in FIG. 3A, the liquid crystal lens further includes: a polarizer 800 located between the compensation lens 700 and the Fresnel lens 600, the transmission axis of the polarizer 800 is perpendicular or parallel to the initial alignment direction of the long axis of the liquid crystal in the liquid crystal layer 300 . The embodiments of the present disclosure do not specifically limit the position of the polarizer. For example, the polarizer may also be located on the side of the first transparent substrate away from the compensation lens.

For example, the incident light enters the polarizer 800 after passing through the first transparent substrate 100 and the compensation lens 700, and then exits the polarized light after passing through the polarizer 800. The polarized light can be modulated by the Fresnel lens 600 and the liquid crystal layer 300 from the second The transparent substrate 200 emits light.

The embodiments of the present disclosure are not limited to disposing a polarizer on the liquid crystal lens, and a second transparent substrate 200 of the liquid crystal lens shown in FIG. 3A can be stacked on the side far away from the first transparent substrate 100 with a structure that is exactly the same as the liquid crystal lens. The matched liquid crystal lens is different from the liquid crystal lens shown in FIG. 3A in that the alignment directions of the alignment films of the two are perpendicular to each other to modulate the two polarized light components perpendicular to each other in natural light.

For example, the liquid crystals in the liquid crystal layer 300 are anisotropic crystals. Taking liquid crystal as a single-axis crystal as an example, when a beam of polarized light passes through a single-axis crystal, two beams of polarized light will be formed. This phenomenon is called birefringence. The refractive index of uniaxial liquid crystal light is n _y and n _z when propagating in the x direction, and the refractive indices are n _x and n _z when propagating in the y direction. There is only one refractive index n _x (=n _y ), so the z-axis of the single optical axis liquid crystal is called the optical axis. If the propagation direction of light is not on the xyz axis, generally the light whose vibration direction is perpendicular to the optical axis is called normal light, and the light whose vibration direction is parallel to the optical axis is called abnormal light. The refractive index of normal light is defined as n _⊥ , the refractive index of abnormal light is defined as n _∥ , and the birefringence is defined as Δn = n _∥ -n _⊥ . When the liquid crystal is a positive light liquid crystal, n _∥ >n _⊥ , Δn>0. The embodiments of the present disclosure are described by taking the liquid crystal as a positive optical liquid crystal as an example. The refractive index of the liquid crystal in the power-off state (the state shown in FIG. 2A) is the abnormal light refractive index, and the refractive index in the power-on state is the normal light refractive index. .

For example, the refractive index of the liquid crystal in the liquid crystal layer 300 in the embodiment of the present disclosure is configured to vary between the first refractive index n1 and the second refractive index n2, and one of the first refractive index n1 and the second refractive index n2 is normal. The refractive index of light, the other is the refractive index of abnormal light, take n1>n2 as an example for description. The refractive index n0 of the Fresnel lens 600 satisfies: n1≥n0≥n2.

For example, when the voltage applied to the first transparent electrode 400 and the second transparent electrode 500 is 0V, the long axis of the liquid crystal molecules is parallel to the first transparent substrate 100 (the state shown in FIG. 3A), and the vibration direction of the incident polarized light is parallel On the optical axis of the liquid crystal, the refractive index of the liquid crystal is n1; when the first transparent electrode 400 is applied with a high voltage and the second transparent electrode 500 is applied with a 0V voltage, the liquid crystal molecules are subjected to a strong electric field, and their long axis is perpendicular to the first transparent substrate 100. At this time, the vibration direction of the incident polarized light is perpendicular to the optical axis of the liquid crystal, and the refractive index of the liquid crystal is n2.

For example, take the refractive index n0=n1 of the Fresnel lens 600 as an example. When the liquid crystal is in the power-off state, the refractive index of the Fresnel lens 600 is the same as the refractive index of the liquid crystal layer 300 in the power-off state. At this time, the Fresnel lens 600 and the liquid crystal layer 300 can be used as a flat plate structure, parallel to the incident The direction of light propagation has no effect. When the liquid crystal is in the energized state, since the refractive index of the Fresnel lens 600 is greater than the refractive index of the liquid crystal layer 300 in the energized state, the parallel light incident on the interface between the Fresnel lens 600 and the liquid crystal layer 300 is diffused, and the Fresnel lens The combination of the Er lens 600 and the liquid crystal layer 300 functions as a divergent lens. As a result, the liquid crystal lens can switch between divergent light and transmission functions.

For example, take the refractive index n0=n2 of the Fresnel lens 600 as an example. When the liquid crystal is energized, the refractive index of the Fresnel lens 600 is the same as the refractive index of the liquid crystal layer 300 when the liquid crystal layer 300 is energized. At this time, the Fresnel lens 600 and the liquid crystal layer 300 can be used as a flat plate structure to resist the incident parallel light. The direction of propagation has no effect. When the liquid crystal is in the power-off state, since the refractive index of the Fresnel lens 600 is smaller than the refractive index of the liquid crystal layer 300 in the power-off state, the parallel light incident on the interface between the Fresnel lens 600 and the liquid crystal layer 300 is condensed. The combination of the Fresnel lens 600 and the liquid crystal layer 300 functions as a condensing lens. In this way, the liquid crystal lens can be switched between the light collection and transmission functions.

For example, take the refractive index n0 of the Fresnel lens 600 satisfying n1>n0>n2 as an example. When the liquid crystal is in the energized state, the refractive index of the Fresnel lens 600 is greater than the refractive index of the liquid crystal layer 300 in the energized state. At this time, the parallel light incident on the interface between the Fresnel lens 600 and the liquid crystal layer 300 is diverged, and the Fresnel lens The combination of the lens 600 and the liquid crystal layer 300 functions as a divergent lens. In the power-off state of the liquid crystal, since the refractive index of the Fresnel lens 600 is smaller than the refractive index of the liquid crystal layer 300 in the power-off state, the parallel light incident on the interface between the Fresnel lens 600 and the liquid crystal layer 300 is condensed. The combination of the Nell lens 600 and the liquid crystal layer 300 functions as a condensing lens. Thus, the liquid crystal lens can switch between the functions of diverging light and converging light.

The Fresnel lens in the embodiment of the present disclosure has a fixed focus function, which determines the refractive power of the liquid crystal lens, and by matching the refractive index of the liquid crystal in the liquid crystal layer, the objective of changing the focal length of the liquid crystal lens can be achieved. For example, the refractive power of a Fresnel lens is determined by the radius of curvature, aperture, and refractive index. The steps of optical design of the Fresnel lens may include: according to the target refractive power and the refractive index range of the material used, the initial structure of the Fresnel lens is calculated and designed; and then the wavelength range of the incident light, the field of view, the tolerance range, etc. As required, the free variables such as the radius of curvature, refractive index, and thickness of the initial structure of the Fresnel lens are optimized and corrected (for example, the parameters of the radius of curvature are adjusted to form an aspheric surface shape; the refractive index parameters are adjusted finely or the thickness is optimized), and finally Optimize the design of lens parameters that meet the image quality requirements.

In the embodiments of the present disclosure, the refractive index of the Fresnel lens can be matched with the refractive index of the liquid crystal layer to realize the switching of the liquid crystal lens between multiple functions. The compensation lens in the embodiment of the present disclosure is matched with the Fresnel lens, so that the electric field acting on different positions in the liquid crystal layer is compensated, and the problem of uneven electric field is solved to make the liquid crystal deflection in the liquid crystal layer uniform.

For example, as shown in FIG. 3A, the compensation lens 700 includes a cured liquid crystal layer. The deflection direction of the liquid crystal molecules at positions directly opposite to the Fresnel lenses of different thicknesses in the cured liquid crystal layer is different, so that the dielectric constants of the compensation lenses at positions directly opposite to the Fresnel lenses of different thicknesses are different. The deflection direction of the liquid crystal molecules in the compensation lens determines the dielectric constant of the compensation lens. Therefore, the required dielectric constant can be obtained by adjusting the deflection directions of the liquid crystal molecules at different positions in the compensation lens.

For example, as shown in FIG. 3A, the liquid crystals in the liquid crystal layer are positive liquid crystals. Since the dielectric constant of the compensation lens 700 is configured to be negatively correlated with the thickness of the Fresnel lens 600 at the position directly opposite, in the second central portion 710 (or, in each second annular portion 720), The liquid crystal molecules 711 at the position corresponding to the minimum thickness of the Fresnel lens 600 are approximately parallel to the first transparent substrate 100, and the liquid crystal molecules 711 at the position corresponding to the maximum thickness of the Fresnel lens 600 are approximately perpendicular to the first transparent substrate 100, and along the direction in which the thickness of the Fresnel lens 600 changes from small to large, the liquid crystal molecules 711 directly opposite to the Fresnel lens 600 gradually change from the deflected state (horizontal orientation) parallel to the first transparent substrate 100 to perpendicular to the first transparent substrate 100. The deflection state (vertical orientation) of a transparent substrate 100 changes. As a result, the center of the circular orthographic projection along the second central portion points to the direction of the circumference, the dielectric constant of the second central portion of the compensation lens gradually decreases, and the dielectric constant of the second annular portion of the compensation lens gradually decreases. small. The aforementioned liquid crystal molecules parallel to the first transparent substrate means that the long axis of the liquid crystal molecules is parallel to the first transparent substrate, and the liquid crystal molecules perpendicular to the first transparent substrate means that the long axis of the liquid crystal molecules is perpendicular to the first transparent substrate.

For example, FIG. 3B is a schematic plan view of the liquid crystal structure in the second ring portion shown in FIG. 3A. As shown in FIG. 3B, the compensation lens 700 includes a plurality of liquid crystal rings 702, that is, the liquid crystals in the compensation lens 700 are arranged in a circular ring around the central axis of the second central portion 710 extending in the Y direction, and the liquid crystals in the same circular ring The long axis and the central axis of the liquid crystal molecules have the same angle. For example, the liquid crystals in each liquid crystal ring 702 shown in FIG. 3B are symmetrically distributed. For example, the multiple liquid crystals in each liquid crystal ring may also be deflected in the same direction. As long as the angle between the deflection direction of each liquid crystal molecule in each ring and the central axis is the same to meet the requirement of dielectric constant.

According to the changing law of the dielectric constant of the compensation lens, the compensation lens is equivalent to the shape of the lens shown in FIG. 3C. The compensation lens in FIG. 3C can be regarded as a lens that is complementary to the shape of the Fresnel lens in FIG. 3A. Therefore, the Fresnel lens and the compensation lens have opposite effects on the electric field of the liquid crystal layer acting at the same position to realize the electric field. Compensation.

For example, the liquid crystal in the compensation lens can be cured according to the thickness change rule of the Fresnel lens. For example, the process of curing the liquid crystal may include: preparing the corresponding alignment layer on the substrate, coating the liquid crystal layer material, pre-baking the liquid crystal layer material, irradiating the liquid crystal layer material with ultraviolet light, and then post-baking the liquid crystal layer material . The embodiments of the present disclosure are not limited to the process of curing the liquid crystal, as long as the cured liquid crystal satisfies the aforementioned alignment rule.

For example, as shown in FIG. 3A, the compensation lens 700 includes two surfaces opposite to each other, both surfaces are parallel to the main plane of the first transparent substrate 100, and the surface of the Fresnel lens 600 facing the compensation lens 700 is parallel to The main plane of the first transparent substrate 100. Here, the main plane of the first transparent substrate 100 is a plane perpendicular to the Y direction shown in the figure. In the embodiments of the present disclosure, the surface of the compensation lens facing the Fresnel lens is parallel to the surface of the Fresnel lens facing the compensation lens, which can prevent the compensation lens from affecting the incident direction of incident light to the Fresnel lens.

For example, as shown in FIG. 3A, the refractive index of the compensation lens 700 along the direction perpendicular to the main plane of the first transparent substrate 100 (ie the Y direction) is consistent, that is, the alignment direction of the liquid crystals arranged in the Y direction in the compensation lens 700 the same.

For example, the equivalent refractive index of the second central portion 710 in the compensation lens 700 is configured to be negatively correlated with the thickness of the first central portion 621 at the opposite position, and the equivalent of the second annular portion 720 in the compensation lens 700 is The refractive index is configured to be negatively correlated with the thickness of the first annular portion 622 at the position directly opposite. According to the matching relationship between the equivalent refractive index of the compensation lens and the thickness of the Fresnel lens, it can be obtained that the compensation lens can be equivalent to the convex lens shown in FIG. 3B. The parallel light incident on the compensation lens will be condensed by the compensation lens. The condensed light is diverged by the Fresnel lens (when the refractive index of the Fresnel lens is greater than the refractive index of the liquid crystal layer). Although the compensation lens in the embodiment of the present disclosure has a converging effect on incident light, its refractive index is very small, so the focal point is very long, and the convergence deflection is not obvious, but the divergence function of the Fresnel lens is slightly somewhat weaken. Therefore, in an example of this embodiment, the compensation lens and the Fresnel lens can be used as a combination (for example, a combination of positive and negative lenses, or a combination of positive and positive lenses), by designing the refractive index, radius of curvature, thickness, and The deflection state of the liquid crystal molecules can design different combined lenses to achieve different focal lengths. The embodiments of the present disclosure are not limited to this, and the material of the compensation lens can also be selected to make the refractive index of the compensation lens unchanged, thereby not affecting the deflection of incident light.

For example, along the direction perpendicular to the main plane of the first transparent substrate 110, the thickness of the compensation lens 700 is 0.5-25 microns.

For example, FIG. 4A is a schematic cross-sectional structure diagram of a liquid crystal lens provided by another example of an embodiment of the disclosure. The shape of the Fresnel lens in the liquid crystal lens shown in FIG. 4A is different from the shape of the Fresnel lens of the liquid crystal lens shown in FIGS. 2A to 3B. As shown in FIG. 4A, from the center of the circular orthographic projection of the Fresnel lens 600 on the first transparent substrate 100 to the circumferential direction, when the thickness of the first central portion 621 gradually decreases, the dielectric of the second central portion 710 The constant gradually increases. When an intermediate state voltage (for example, a voltage of 3.5V) is applied to the first transparent electrode, the electric field acting on the liquid crystal layer located at the edge of the first central portion is greater than the electric field acting on the liquid crystal layer located at the center of the first central portion; The electric field of the liquid crystal layer at the edge of the second central part is smaller than the electric field acting on the liquid crystal layer at the center of the second central part. That is, the influence of the Fresnel lens and the compensation lens on the electric field acting on the liquid crystal layer at the same position is opposite to realize the electric field compensation. Therefore, the design of the dielectric constant of the second central part to match the thickness of the first central part can compensate the unevenly distributed electric field caused by the thickness of the Fresnel lens as much as possible when the intermediate state voltage is applied to the first transparent electrode, so that The deflection of the liquid crystal molecules in the liquid crystal layer is approximately uniform, thereby realizing the continuous change of the refractive index of the liquid crystal and the continuous adjustment of the degree of the liquid crystal lens.

Similarly, the dielectric constant of the second annular portion 720 is configured to be negatively correlated with the thickness of the first annular portion 622 at the position directly opposite.

For example, as shown in FIG. 4A, from the center of the circle to the direction of the circumference, the thickness of each first ring portion 622 gradually decreases, and the dielectric constant of each second ring portion 720 gradually increases . Therefore, the design of the dielectric constant of the second ring portion to match the thickness of the first ring portion can compensate the unevenly distributed electric field caused by the thickness of the Fresnel lens as much as possible when the intermediate state voltage is applied to the first transparent electrode, thereby The deflection of the liquid crystal molecules in the liquid crystal layer is approximately uniform, thereby realizing the continuous change of the refractive index of the liquid crystal and the continuous adjustment of the degree of the liquid crystal lens.

For example, as shown in FIG. 4A, the compensation lens 700 includes a cured liquid crystal layer. For example, the liquid crystal in the liquid crystal layer is a positive liquid crystal. In the second central portion 710 (or, in each second annular portion 720), the liquid crystal molecules 711 at the position where the thickness of the Fresnel lens 600 is the smallest are approximately parallel to the first transparent substrate 100, corresponding to The liquid crystal molecule 711 at the position where the thickness of the Fresnel lens 600 is the largest is approximately perpendicular to the first transparent substrate 100, and the liquid crystal molecule 711 facing the Fresnel lens 600 in the direction where the thickness of the Fresnel lens 600 changes from larger to smaller The molecules 711 gradually change from a deflection state (vertical orientation) perpendicular to the first transparent substrate 100 to a deflection state (horizontal orientation) parallel to the first transparent substrate 100. Thus, along the direction from the center of the second center portion to the circumference, the dielectric constant of the second center portion of the compensation lens gradually increases, and the dielectric constant of the second ring portion of the compensation lens also gradually increases. According to the changing law of the dielectric constant of the compensation lens, the compensation lens is equivalent to the shape of the lens shown in FIG. 4B. The compensation lens in FIG. 4B can be regarded as a lens that is complementary to the shape of the Fresnel lens in FIG. 4A. Therefore, the Fresnel lens and the compensation lens have opposite effects on the electric field of the liquid crystal layer acting at the same position to realize the electric field. Compensation.

5 is a schematic diagram of the deflection state of liquid crystal molecules in the liquid crystal layer in the region above the first center portion of the Fresnel lens when the intermediate state voltage is applied to the first transparent electrode in the examples shown in FIGS. 2A-3B. As shown in FIG. 5, taking the liquid crystal layer located at the first center of the Fresnel lens as an example, the area D located above the thicker position of the first center and the area D located above the thinner position of the first center The liquid crystal molecules in the area E are basically in the same deflection state. At this time, the refractive index of each position of the liquid crystal layer is approximately uniform, and there is no image blur caused by stray light. Therefore, the liquid crystal in the liquid crystal lens shown in FIGS. 2A to 3B can achieve continuous changes in refractive index, thereby achieving the adjustable power of the glasses. Of course, the deflection of the liquid crystal molecules in the liquid crystal layer in the example shown in FIGS. 4A-4B is also uniform.

Another embodiment of the present disclosure provides a liquid crystal glasses including the liquid crystal lens provided in any of the above embodiments. The liquid crystal molecules in the liquid crystal layer of the liquid crystal glasses provided in the embodiment of the present disclosure are under the action of an electric field generated by an intermediate state voltage. The deflection of the lens is uniform, and the continuous change of the refractive index can be realized, so that the degree of the glasses can be adjusted. In addition, the liquid crystal glasses provided by the embodiments of the present disclosure can also realize multi-functional transformations such as concave lens and convex lens to meet the needs of various users.

The following points need to be explained:

(1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures can refer to the usual design.

(2) In the case of no conflict, the features in the same embodiment and different embodiments of the present disclosure can be combined with each other.

The above are only exemplary embodiments of the present disclosure, and are not used to limit the protection scope of the present disclosure, which is determined by the appended claims.

Claims (18)

A liquid crystal lens, including: A first transparent substrate, a second transparent substrate opposite to the first transparent substrate, and a liquid crystal layer located between the first transparent substrate and the second transparent substrate; The Fresnel lens is located between the first transparent substrate and the liquid crystal layer, and the side of the Fresnel lens facing the liquid crystal layer is provided with grooves distributed at intervals of the Fresnel zone; and A compensation lens, located between the Fresnel lens and the first transparent substrate, Wherein, the dielectric constant of the compensation lens at a different thickness from the Fresnel lens is different, and the dielectric constant of the compensation lens is configured to be the same as the thickness of the Fresnel lens at the position directly opposite Negative correlation. The liquid crystal lens of claim 1, further comprising: The first transparent electrode is located between the compensation lens and the first transparent substrate; and The second transparent electrode is located between the liquid crystal layer and the second transparent substrate. The liquid crystal lens according to claim 1 or 2, wherein the Fresnel lens includes a first central portion and a plurality of first annular portions surrounding the first central portion, from the first central portion to The center of the orthographic projection on the first transparent substrate points in the direction of the edge, the thickness of each of the first annular portion and the first central portion gradually changes, and the thickness change trends of the two are the same; The compensation lens includes a second central portion and a plurality of second annular portions surrounding the second central portion, and the orthographic projection of the first central portion on the first transparent substrate and the second central portion The orthographic projection on the first transparent substrate coincides, the orthographic projection of the first annular portion on the first transparent substrate and the orthographic projection of the second annular portion on the first transparent substrate One-to-one correspondence coincides, and the dielectric constant of the second central portion is configured to be inversely related to the thickness of the first central portion at the opposite position, and the dielectric constant of the second annular portion is configured to It is negatively correlated with the thickness of the first annular portion at the position directly opposite. The liquid crystal lens according to claim 3, wherein, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, each of the first annular portion and the first The thickness of a central portion gradually increases, and the dielectric constant of each of the second annular portion and the second central portion gradually decreases. The liquid crystal lens according to claim 3, wherein, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, each of the first annular portion and the first The thickness of a central portion gradually decreases, and the dielectric constant of each of the second annular portion and the second central portion gradually increases. The liquid crystal lens according to any one of claims 3-5, wherein the orthographic projection of the first central portion on the first transparent substrate is a circle, and the first central portion is on the first transparent substrate. The direction in which the center of the orthographic projection on the substrate points to the edge is the radial direction of the circle. The liquid crystal lens according to any one of claims 3-6, wherein the first central portion and the plurality of first ring-shaped portions surrounding the first central portion are an integral structure; the second center The part is an integral structure with the plurality of second annular parts surrounding the second central part. The liquid crystal lens according to any one of claims 3-7, wherein, in a direction perpendicular to the main plane of the first transparent substrate, the maximum thickness of the first central portion is equal to the maximum thickness of the first ring The ratio of the maximum thickness of at least one of the sections is 0.9 to 1.1, and the ratio of the minimum thickness of the first central section to the minimum thickness of at least one of the plurality of first annular sections is 0.9 to 1.1. The liquid crystal lens according to claim 8, wherein, in a direction perpendicular to the main plane of the first transparent substrate, the maximum thickness of each of the first ring portions is the same, and the thickness of each of the first ring portions The minimum thickness is the same. 9. The liquid crystal lens of any one of claims 3-9, wherein the compensation lens comprises cured liquid crystal. 10. The liquid crystal lens of claim 10, wherein the liquid crystal in the compensation lens is a positive liquid crystal. The liquid crystal lens according to claim 11, wherein, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, each of the first annular portion and the first transparent substrate The thickness of a central portion gradually increases, and the liquid crystal molecules in each of the second annular portion and the second central portion gradually change from a deflection direction parallel to the main plane of the first transparent substrate to perpendicular to The direction of deflection of the principal plane of the first transparent substrate; or, from the center of the orthographic projection of the first central portion on the first transparent substrate to the direction of the edge, each of the first annular portions and the The thickness of the first central portion is gradually reduced, and the liquid crystal molecules in each of the second annular portion and the second central portion gradually change from the deflection direction perpendicular to the main plane of the first transparent substrate to parallel The direction of deflection on the principal plane of the first transparent substrate. The liquid crystal lens according to claim 12, wherein the liquid crystal in the compensation lens comprises a plurality of liquid crystal rings surrounding the central axis of the compensation lens, and the liquid crystal molecules in the same liquid crystal ring and the central axis The angle is the same. The liquid crystal lens according to any one of claims 10-13, wherein the equivalent refractive index of the second central portion is configured to be negatively correlated with the thickness of the first central portion at a position directly opposite, the The equivalent refractive index of the second annular portion is configured to be negatively correlated with the thickness of the first annular portion at the position directly opposite. The liquid crystal lens according to any one of claims 1-14, wherein the compensation lens comprises two surfaces opposite to each other, the two surfaces are both parallel to the main plane of the first transparent substrate, and the The surface of the Fresnel lens facing the compensation lens is parallel to the main plane of the first transparent substrate. 15. The liquid crystal lens of claim 15, wherein the compensation lens has a thickness of 0.5-25 microns in a direction perpendicular to the main plane of the first transparent substrate. The liquid crystal lens according to any one of claims 1-16, wherein the refractive index of the liquid crystal in the liquid crystal layer is configured to vary between a first refractive index n1 and a second refractive index n2, and the Fresnel The refractive index n0 of the Er lens satisfies: n1≥n0≥n2. A liquid crystal glasses, comprising the liquid crystal lens of any one of claims 1-17.

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