Out-of-focus lens and glasses

Abstract

The invention provides an out-of-focus lens and glasses, and relates to the technical field of optical lenses, the out-of-focus lens comprises a liquid crystal lens assembly and a polarization unit; the liquid crystal lens assembly comprises a first liquid crystal lens and a second liquid crystal lens. The second liquid crystal lens comprises a central area and an out-of-focus area, and the out-of-focus area surrounds the outer side of the central area; the position, corresponding to the central area, of the defocus lens is a central part, and the position, corresponding to the defocus area, of the defocus lens is a defocus part; the central part can have a first negative diopter; the defocus site can have a second positive diopter. Due to the fact that the first liquid crystal lens and the second liquid crystal lens are used, the driving voltage can be adjusted according to the myopia degrees of different users, and different user groups can use the same defocus lens. A user can adjust the degree according to the improvement condition of the myopia degree in the using process, the defocus lens does not need to be frequently replaced, and the defocus lens can have a larger visual field range by temporarily closing the defocus part.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a defocused lens and glasses. Background Art

[0002] Traditional eyeglass lenses only provide the clearest correction for the center of vision. The images received by the peripheral retina are not formed exactly on the retina, but behind the retina. The use of glasses will cause the eye axis to grow, leading to hyperopic defocus and aggravating the degree of myopia.

[0003] Defocus lenses are designed to have a lower lens power outside the central area than in the central area, so that objects are projected in front of the retina, forming myopic defocus, which plays a role in preventing the worsening of myopia.

[0004] The defocus lenses used for myopia prevention and control in the prior art form a defocus area of ​​a certain size outside the central area of ​​ordinary myopia glasses, the central area has a first refractive power (negative) for myopia correction, and the defocus area has an additional second refractive power (positive).

[0005] However, both the first diopter (negative) and the second diopter (positive) cannot be adjusted, and the same defocus lens can neither adapt to people with different degrees of myopia nor be adjusted as personal vision changes. Summary of the invention

[0006] The object of the present invention is to provide a defocus lens to solve the technical problem that both the first negative refractive power (negative) and the second positive refractive power (positive) of the defocus lens in the prior art cannot be adjusted.

[0007] The defocus lens provided by the present invention comprises a liquid crystal lens assembly and a polarization unit;

[0008] The liquid crystal lens assembly comprises a first liquid crystal lens and a second liquid crystal lens, wherein the second liquid crystal lens is arranged on one side of the first liquid crystal lens; the polarization unit is arranged on a side of the liquid crystal lens assembly away from human eyes;

[0009] The second liquid crystal lens comprises a central area and a defocused area, and the defocused area is arranged outside the central area;

[0010] The position of the defocused lens corresponding to the central area is the central part, and the position of the defocused lens corresponding to the defocused area is the defocused part;

[0011] The central portion can have a first negative refractive power; the defocused portion can have a second positive refractive power.

[0012] Further, the liquid crystal molecules of the first liquid crystal lens are oriented in a first direction;

[0013] The liquid crystal molecules in the defocused area are oriented in a first direction, and the liquid crystal molecules in the central area are oriented in a second direction; the first direction is perpendicular to the second direction;

[0014] The polarization unit covers the defocused area, and a polarization direction of the polarization unit is located in a first direction.

[0015] Furthermore, the liquid crystal molecule orientation of the first liquid crystal lens, the liquid crystal molecule orientation of the second liquid crystal lens, and the polarization direction of the polarization unit are the same;

[0016] The liquid crystal in the central area cannot be driven; and the polarization unit covers the effective area of ​​the first liquid crystal lens.

[0017] Further, the defocused area includes a plurality of annular areas, and the plurality of annular areas are sequentially arranged along the radial direction of the defocused area;

[0018] A plurality of liquid crystal microlens units are arranged in each of the annular regions, and the apertures of the plurality of liquid crystal microlens units in each of the annular regions are the same;

[0019] Along the radial direction of the defocused area, the apertures of the liquid crystal microlens units in the annular areas decrease from the inner edge to the outer edge.

[0020] Furthermore, the aperture of the liquid crystal microlens unit is ≤2 mm.

[0021] Furthermore, the radius of the central area is ≤5 mm.

[0022] Furthermore, the diameter of the first liquid crystal lens is greater than 30 mm.

[0023] Furthermore, the first liquid crystal lens, the second liquid crystal lens and the polarization unit are arranged in sequence.

[0024] Furthermore, the second liquid crystal lens, the first liquid crystal lens and the polarization unit are arranged in sequence.

[0025] The present invention also aims to provide a pair of glasses, comprising the defocused lenses provided by the present invention.

[0026] The defocus lens provided by the present invention comprises a liquid crystal lens assembly and a polarization unit; the liquid crystal lens assembly comprises a first liquid crystal lens and a second liquid crystal lens, the second liquid crystal lens is arranged on one side of the first liquid crystal lens; the polarization unit is arranged on the side of the liquid crystal lens assembly away from the human eye; the second liquid crystal lens comprises a central area and a defocus area, the defocus area is arranged outside the central area; the position of the defocus lens corresponding to the central area is the central part, and the position of the defocus lens corresponding to the defocus area is the defocus part; the central part can have a first negative refractive power; the defocus part can have a second positive refractive power. Due to the use of the first liquid crystal lens and the second liquid crystal lens, the first negative refractive power of the central part and the second positive refractive power of the defocus part can be changed by adjusting the driving voltage, and the driving voltage can be adjusted according to the myopia degree of different users, so that different user groups can use the same defocus lens; and the user can adjust the first negative refractive power of the central part and the second positive refractive power of the defocus part according to the improvement of their own myopia degree during use. If the user's myopia degree is reduced, the degree of the central part and the defocus part can be reduced, and there is no need to frequently replace the defocus lens. In addition, by using the first liquid crystal lens and the second liquid crystal lens, the defocused lens can have a larger field of view and stronger adjustability by temporarily closing the defocused portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a schematic structural diagram of a defocus lens in an implementation manner provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a first liquid crystal lens in a defocused lens provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of a second liquid crystal lens in a defocused lens provided by an embodiment of the present invention;

[0031] Figure 4 This is a principle diagram of the optical paths of the first liquid crystal lens and the second lens in the defocus lens provided by an embodiment of the present invention;

[0032] Figure 5 is a front view of a second liquid crystal lens in a defocused lens provided by an embodiment of the present invention;

[0033] Figure 6 is a coordinate diagram of a liquid crystal microlens unit and an optical path difference in a defocus lens provided by an embodiment of the present invention;

[0034] Figure 7 A schematic structural diagram of a defocus lens in another implementation manner provided by an embodiment of the present invention.

[0035] Icons: 10 - first liquid crystal lens; 20 - second liquid crystal lens; 21 - liquid crystal microlens unit; 22 - central area; 23 - defocused area; 231 - annular area; 30 - polarization unit; 100 - defocused lens. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention provides a defocus lens and glasses. A plurality of embodiments are given below to describe the defocus lens and glasses provided by the present invention in detail.

[0038] Example 1

[0039] The defocus lens 100 provided in this embodiment is as follows: Figures 1 to 7 As shown, it includes a liquid crystal lens assembly and a polarization unit 30; the liquid crystal lens assembly includes a first liquid crystal lens 10 and a second liquid crystal lens 20, and the second liquid crystal lens 20 is arranged on one side of the first liquid crystal lens 10; the polarization unit 30 is arranged on the side of the liquid crystal lens assembly away from the human eye; the second liquid crystal lens 20 includes a central area 22 and a defocused area 23, and the defocused area 23 is surrounded outside the central area 22; the position of the defocused lens 100 corresponding to the central area 22 is the central part, and the position of the defocused lens 100 corresponding to the defocused area 23 is the defocused part; the central part can have a first negative refractive power; the defocused part can have a second positive refractive power.

[0040] The first liquid crystal lens 10 is a main lens, which is used to provide a first negative refractive power for myopia correction. In this embodiment, the first liquid crystal lens 10 is a Fresnel liquid crystal lens.

[0041] The second liquid crystal lens 20 is used as an additional lens. In the second liquid crystal lens 20, a circular area with a radius R1 and a center point thereof is a central area 22, and an annular area 231 with a radius R1-R2 in the second liquid crystal lens 20 is a defocus area 23. The central area 22 is a Fresnel liquid crystal lens, and a plurality of liquid crystal micro lens units 21 are arranged in the defocus area 23, and the liquid crystal micro lens units 21 are spherical mirrors.

[0042] In the defocus lens 100 as a whole, the circular area with a radius of R1 with the center of the second liquid crystal lens 20 as the reference point is the central part, and the central part is set corresponding to the position of the central area 22; in the defocus lens 100 as a whole, the annular area 231 with a radius of R1-R2 is the defocus part, and the defocus part is set corresponding to the position of the defocus area 23. Under the overall action of the liquid crystal lens assembly and the polarization unit 30, the central part can have a first negative refractive power for myopia correction, and the defocus part can have an additional second positive refractive power, so as to be used for myopia prevention and control.

[0043] The defocused lens 100 provided in this embodiment uses the first liquid crystal lens 10 and the second liquid crystal lens 20. The first negative refractive power of the central portion and the second positive refractive power of the defocused portion can be changed by adjusting the driving voltage. The driving voltage can be adjusted according to the myopia degree of different users, so that different user groups can use the same defocused lens 100.

[0044] Furthermore, due to the use of the first liquid crystal lens 10 and the second liquid crystal lens 20, the user can adjust the first negative refractive power of the central part and the second positive refractive power of the defocused part according to the improvement of the degree of myopia during use. If the degree of myopia of the user is reduced, the degree of the central part and the defocused part can be reduced, and there is no need to frequently replace the defocused lens 100.

[0045] In addition, by using the first liquid crystal lens 10 and the second liquid crystal lens 20, the defocused lens 100 can have a larger field of view and stronger adjustability by temporarily closing the defocused portion.

[0046] In an alternative embodiment, Figure 1 As shown, the liquid crystal molecules of the first liquid crystal lens 10 are oriented in a first direction; the liquid crystal molecules of the defocused area 23 are oriented in the first direction, and the liquid crystal molecules of the central area 22 are oriented in a second direction; the first direction is perpendicular to the second direction; the polarization unit 30 covers the defocused area 23, and the polarization direction of the polarization unit 30 is in the first direction.

[0047] The first liquid crystal lens 10 is a main lens. When the first liquid crystal lens 10 is driven, the first liquid crystal lens 10 has a first negative refractive power, and the liquid crystal molecules of the first liquid crystal lens 10 are oriented in a first direction. When the central area 22 of the first liquid crystal lens 10 and the second liquid crystal lens 20 are both driven, the central part of the defocused lens 100 forms a first negative refractive power for myopia correction.

[0048] The second liquid crystal lens 20 serves as an additional lens, and provides at least three different refractive powers. The central area 22 has a first negative refractive power for myopia correction, and the defocus area 23 has at least two different second positive refractive powers. Along the radial direction of the defocus area 23, the second positive refractive power of the defocus area 23 increases from the inner edge to the outer edge of the defocus area 23, that is, the defocus area 23 close to the central area 22 has a relatively small second positive refractive power, and the defocus area 23 close to the outer edge of the second liquid crystal lens 20 has a relatively large second positive refractive power.

[0049] The liquid crystal molecules in the defocused area 23 are oriented in a first direction, and the liquid crystal molecules in the central area 22 are oriented in a second direction.

[0050] The polarization unit 30 is disposed on a side of the liquid crystal lens assembly away from the human eye, and the polarization unit 30 only covers the defocused area 23, and the polarization unit 30 exposes the central area 22. The polarization direction of the polarization unit 30 is in the first direction, that is, the polarization direction of the polarization unit 30, the liquid crystal molecular orientation of the first liquid crystal lens 10, and the liquid crystal molecular orientation direction of the defocused area 23 are consistent.

[0051] According to the above configuration, when the first liquid crystal lens 10 and the central area 22 of the second liquid crystal lens 20 are driven simultaneously, the first liquid crystal lens 10 has a first negative refractive power, the central area 22 of the second liquid crystal lens 20 also has a first negative refractive power, and relative to the central area 22, the incident light is natural light. Figure 1 and Figure 4 As shown, the natural light is decomposed into two components in the first direction and the second direction with two vibration directions perpendicular to each other. The incident light in the second direction passes through the central area 22 of the second liquid crystal lens 20. For the second liquid crystal lens 20, the incident light is E light and is modulated, while the incident light in the first direction is O light and is not modulated. When passing through the first liquid crystal lens 10 again, the incident light in the second direction is O light and is not modulated for the first liquid crystal lens 10, while the incident light in the first direction is E light and is modulated for the first liquid crystal lens 10. Since the liquid crystal molecules of the first liquid crystal lens 10 and the central area 22 are perpendicular to each other, the central part of the defocus lens 100 for incident natural light after being driven still has the first negative refractive power as a whole, and at the same time, it is ensured that the central area 22 has a high transmittance and brightness.

[0052] In another alternative embodiment, Figure 7 As shown, the liquid crystal molecular orientation of the first liquid crystal lens 10 , the liquid crystal molecular orientation of the second liquid crystal lens 20 and the polarization direction of the polarization unit 30 are the same; the liquid crystal in the central area 22 cannot be driven; and the polarization unit 30 covers the effective area of ​​the first liquid crystal lens 10 .

[0053] The liquid crystal molecule orientations of the first liquid crystal lens 10, the liquid crystal molecule orientations of the second liquid crystal lens 20 and the polarization direction of the polarization unit 30 are the same, and the central region 22 of the second liquid crystal lens 20 has no function (for example, there is no ITO electrode in the central region 22, or an electrode is provided but no external driving voltage is connected, etc., but liquid crystal may exist), that is, the liquid crystal within a diameter range of about 10 mm in the central region 22 cannot be driven, and always maintains its initial liquid crystal molecule orientation, and the second liquid crystal lens 20 provides at least two different second positive refractive powers only in the defocus region 23.

[0054] In this embodiment, the polarization unit 30 covers the entire effective area of ​​the first liquid crystal lens 10. When the incident light is polarized and passes through the first liquid crystal lens 10, a first negative refractive power is generated. When it passes through the central area 22 of the second liquid crystal lens 20 again, since the liquid crystal molecules in the central area 22 are not driven, there will be no effect on the wavefront. Therefore, the corresponding central position still has only the first negative refractive power. For the defocused area 23, when the incident light is polarized and passes through the first liquid crystal lens 10, a first negative refractive power is generated. When it passes through the defocused area 23 of the second liquid crystal lens 20 again, the different positive refractive power generated by the liquid crystal microlens unit 21 in the second lens is added, so that the defocused part has a second positive refractive power, so that the effect of myopic defocusing can be achieved.

[0055] Wherein, the defocused portion may have one positive refractive power, or may have at least two different positive refractive powers. Preferably, the defocused portion may have at least two different second positive refractive powers; and along the radial direction of the defocused portion, the second positive refractive power of the defocused portion increases from the inner edge to the outer edge of the defocused portion. For example, the defocused portion may have three different second positive refractive powers, and along the radial direction of the defocused portion, it includes a first annular area, a second annular area and a third annular area sequentially arranged, the first annular area is sleeved on the outside of the central portion, the second annular area is sleeved on the outside of the first annular area, the third annular area is sleeved on the outside of the second annular area, the second positive refractive power of the first annular area is smaller than the second positive refractive power of the second annular area, and the second positive refractive power of the second annular area is smaller than the second positive refractive power of the third annular area.

[0056] Furthermore, the defocus area 23 includes a plurality of annular areas 231, and the plurality of annular areas 231 are arranged in sequence along the radial direction of the defocus area 23; a plurality of liquid crystal microlens units 21 are arranged in each annular area 231, and the apertures of the plurality of liquid crystal microlens units 21 in each annular area 231 are the same; along the radial direction of the defocus area 23, the apertures of the liquid crystal microlens units 21 in the plurality of annular areas 231 decrease from the inner edge to the outer edge, so that the positive refractive power in the plurality of annular areas 231 increases from the inner edge to the outer edge of the defocus portion.

[0057] For example, the defocus area 23 includes a first annular area, a second annular area, and a third annular area. Along the radial direction of the defocus area 23, the first annular area, the second annular area, and the third annular area are sequentially arranged, the first annular area is sleeved outside the central area, the second annular area is sleeved outside the first annular area, and the third annular area is sleeved outside the second annular area. The apertures of the multiple liquid crystal microlens units 21 in the first annular area are the same, the apertures of the multiple liquid crystal microlens units 21 in the second annular area are the same, and the apertures of the multiple liquid crystal microlens units 21 in the third annular area are the same. The apertures of the liquid crystal microlens units 21 in the first annular area are larger than the apertures of the liquid crystal microlens units 21 in the second annular area, and the apertures of the liquid crystal microlens units 21 in the second annular area are larger than the apertures of the liquid crystal microlens units 21 in the third annular area.

[0058] The plurality of liquid crystal microlens units 21 in each annular region 231 are arranged in an annular array.

[0059] like Figure 1 and Figure 5 As shown, in the defocus area 23 of the radius R1 - R2 , only the positions where the multiple liquid crystal microlens units 21 are located have positive refractive power, and the area between the liquid crystal microlens units 21 does not have any refractive power.

[0060] Therefore, for the defocused portion of the defocused lens 100, the vibration direction of the incident natural light after passing through the polarization unit 30 is completely consistent with the liquid crystal molecular orientation of the defocused area 23 of the second liquid crystal lens 20 and the liquid crystal molecular orientation of the first liquid crystal lens 10. Therefore, the overall effect of the defocused portion of the defocused lens 100 is the first negative refractive power of the first liquid crystal lens 10 superimposed on the additional positive refractive power of the liquid crystal microlens unit 21 of the second liquid crystal lens 20, so that the defocused portion has a second positive refractive power, thereby achieving myopic defocus.

[0061] In the defocus area 23 between the radii R1 and R2, there are at least two or more refractive powers distributed along its radial direction. For example, in the annular area 231 with a width of w1, the refractive powers of the liquid crystal microlens units 21 are the same, which are all D(w1); in the annular area 231 with a width of w2, the refractive powers of the liquid crystal microlens units 21 are the same, which are all D(w2), and D(w1)<D(w2). The defocus area 23 shown here only lists two refractive powers, but is actually not limited to this, and can also be three, four or five.

[0062] Since the defocused area 23 contains a large number of liquid crystal microlens units 21, in order to simplify the design and driving, the aperture of the liquid crystal microlens unit in the ring with a width of w1 is d1, and the aperture of the liquid crystal microlens unit 21 in the ring with a width of w2 is d2, then d1>d2; Figure 6The structure of the liquid crystal microlens unit 21 and the relative aperture size are shown. The electrode C1 is located on one of the substrates of the second liquid crystal lens 20 as a common electrode, and all liquid crystal microlens units 21 share the common electrode C1. A number of concentric annular electrodes (the central electrode is circular) are distributed on another substrate arranged opposite to the second liquid crystal lens 20. For example, the liquid crystal microlens unit 21 with an aperture of d1 includes electrodes E1, E2, ..., En, etc., and the liquid crystal microlens unit 21 with an aperture of d2 includes electrodes E1', E2', ..., En', etc., that is, all liquid crystal microlens units 21 include the same number of annular electrodes.

[0063] like Figure 6 As shown, the horizontal axis of the coordinate system represents the radius of the liquid crystal microlens unit 21, and the vertical axis represents the optical path difference. Electrodes with corresponding numbers of different liquid crystal microlens units 21 are electrically connected together, such as E1 and E1', E2 and E2', ..., En and En', etc., and are respectively given the same driving voltage V1, V2, ..., Vn. When V1<V2<...<Vn, the following is formed Figure 6 The optical path difference curve shown has a second positive refractive power (positive). Since the microlens aperture d1>d2, according to It can be seen that when the optical path difference ΔnL is constant, f1>f2 will inevitably result, that is, the diopter D(w1)<D(w2). Here, Δn is the birefringence of the liquid crystal material, L is the thickness of the liquid crystal material, r is the radius of the liquid crystal microlens unit 21 (i.e., d1 / 2 or d2 / 2), f is the focal length, and the distribution of f1 and f2 represents the focal length size corresponding to the microlens with aperture d1 and aperture d2.

[0064] Furthermore, the aperture of the liquid crystal microlens unit 21 is ≤2 mm.

[0065] The aperture of the liquid crystal microlens unit may be any suitable value such as 2 mm, 1.5 mm or 1 mm.

[0066] Furthermore, the radius of the central area 22 is ≤5 mm.

[0067] The radius of the central area 22 may be any suitable value such as 5 mm, 4 mm, 3 mm, 2 mm or 1 mm.

[0068] Furthermore, the diameter of the first liquid crystal lens 10 is greater than 30 mm.

[0069] The diameter of the first liquid crystal lens 10 can be any suitable form such as 35 mm, 40 mm or 45 mm.

[0070] In one implementation, the first liquid crystal lens 10 , the second liquid crystal lens 20 , and the polarization unit 30 are sequentially laminated and arranged.

[0071] That is, in the defocus lens 100 as a whole, the first liquid crystal lens 10 is arranged close to the human eye, the second liquid crystal lens 20 is arranged on the side of the first liquid crystal lens 10 away from the human eye, and the polarization unit 30 is arranged on the side of the second liquid crystal lens 20 away from the human eye.

[0072] In another embodiment, the second liquid crystal lens 20 , the first liquid crystal lens 10 and the polarization unit 30 are sequentially laminated and arranged.

[0073] That is, in the defocus lens 100 as a whole, the second liquid crystal lens 20 is arranged close to the human eye, the first liquid crystal lens 10 is arranged on the side of the second liquid crystal lens 20 away from the human eye, and the polarization unit 30 is arranged on the side of the first liquid crystal lens 10 away from the human eye.

[0074] In the above two implementations, the positions of the first liquid crystal lens 10 and the second liquid crystal lens 20 can be exchanged without being affected.

[0075] Typically, since the first liquid crystal lens 10 has a larger size, while the central area 22 of the second liquid crystal lens 20 is smaller in size, the size of the liquid crystal microlens unit 21 in the defocused area 23 is even smaller, so that the liquid crystal box thickness of the second liquid crystal lens 20 is much smaller than the box thickness of the first liquid crystal lens 10, which also helps to reduce the haze of the defocused lens 100 and improve the transmittance.

[0076] Example 2

[0077] The glasses provided in this embodiment include the defocused lens 100 provided in Embodiment 1. Since the first liquid crystal lens 10 and the second liquid crystal lens 20 are used, the first negative refractive power (negative) of the central part and the second positive refractive power (positive) of the defocused part can be changed by adjusting the driving voltage, and the driving voltage can be adjusted according to the degree of myopia of different users, so that different user groups can use the same defocused lens 100; and the user can adjust the first negative refractive power (negative) of the central part and the second positive refractive power (positive) of the defocused part according to the improvement of their own myopia during use. If the degree of myopia of the user is reduced, the degree of the central part and the defocused part can be reduced, and there is no need to frequently replace the defocused lens 100. In addition, by using the first liquid crystal lens 10 and the second liquid crystal lens 20, the defocused lens 100 can have a larger field of view and stronger adjustability by temporarily closing the defocused part.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defocus lens, characterized in that: including a liquid crystal lens assembly and a polarization unit; The liquid crystal lens assembly comprises a first liquid crystal lens and a second liquid crystal lens, wherein the second liquid crystal lens is arranged on one side of the first liquid crystal lens; the polarization unit is arranged on a side of the liquid crystal lens assembly away from human eyes; The second liquid crystal lens comprises a central area and a defocused area, and the defocused area is arranged outside the central area; The position of the defocused lens corresponding to the central area is the central part, and the position of the defocused lens corresponding to the defocused area is the defocused part; The central portion can have a first negative refractive power; the defocused portion can have a second positive refractive power.

2. The defocus lens according to claim 1, characterized in that: The liquid crystal molecules of the first liquid crystal lens are aligned in a first direction; The liquid crystal molecules in the defocused area are oriented in a first direction, and the liquid crystal molecules in the central area are oriented in a second direction; the first direction is perpendicular to the second direction; The polarization unit covers the defocused area, and a polarization direction of the polarization unit is located in a first direction.

3. The defocus lens according to claim 1, characterized in that: The liquid crystal molecule orientation of the first liquid crystal lens, the liquid crystal molecule orientation of the second liquid crystal lens and the polarization direction of the polarization unit are the same; The liquid crystal in the central area cannot be driven; and the polarization unit covers the effective area of ​​the first liquid crystal lens.

4. The defocus lens according to any one of claims 1 to 3, characterized in that: The defocused area includes a plurality of annular areas, and the plurality of annular areas are sequentially arranged along the radial direction of the defocused area; A plurality of liquid crystal microlens units are arranged in each of the annular regions, and the apertures of the plurality of liquid crystal microlens units in each of the annular regions are the same; Along the radial direction of the defocus area, the apertures of the liquid crystal microlens units in the plurality of annular areas decrease from the inner edge to the outer edge.

5. The defocus lens according to claim 4, characterized in that: The aperture of the liquid crystal microlens unit is ≤2 mm.

6. The defocus lens according to claim 1, characterized in that: The radius of the central area is ≤5 mm.

7. The defocus lens according to claim 1, characterized in that: The diameter of the first liquid crystal lens is greater than 30 mm.

8. The defocus lens according to claim 1, characterized in that: The first liquid crystal lens, the second liquid crystal lens and the polarization unit are arranged in sequence.

9. The defocus lens according to claim 1, characterized in that: The second liquid crystal lens, the first liquid crystal lens and the polarization unit are arranged in sequence.

10. A pair of glasses, characterized in that: The invention comprises the defocus lens according to any one of claims 1 to 9.

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