CN213042094U - Liquid crystal micro lens and array, imaging device, skin detection device, fingerprint identification device and electronic equipment - Google Patents

Abstract

The utility model provides a liquid crystal microlens and array, image device, skin detection device, fingerprint identification device, electronic equipment relates to liquid crystal lens technical field. The utility model discloses a liquid crystal microlens includes: first electrode unit, poroid electrode unit and second electrode unit, first electrode unit with be provided with the liquid crystal layer between the poroid electrode unit, second electrode unit be located poroid electrode unit with one side that first electrode unit is relative, poroid electrode unit with be provided with the insulating layer between the second electrode unit, the aperture less than or equal to 900 μm of poroid electrode unit. The utility model discloses a liquid crystal microlens and array, image device, fingerprint identification device, electronic equipment optical property are excellent, and stability is high, and the size is thin, the low power dissipation.

Description

Liquid crystal micro lens and array, imaging device, skin detection device, fingerprint identification device and electronic equipment

Technical Field

The utility model relates to a liquid crystal lens technical field specifically is a liquid crystal microlens and array, imaging device, skin detection device, fingerprint identification device, electronic equipment.

Background

The liquid crystal lens is a novel optical device which can control the focal length by adjusting an input voltage signal without mechanical movement. The director arrangement of the liquid crystal molecules can be electrically controlled and tuned to enable the director arrangement to present different refractive index gradient distribution in a non-uniform electric field, so that only the electric field distribution acting on the liquid crystal molecules needs to have certain gradient, the non-uniform distribution of the director of the liquid crystal molecules is induced, emergent light transmitted in a liquid crystal layer generates parabolic phase distribution, the wave front of incident plane wave is bent into convergent or divergent spherical wave, and the characteristic of the liquid crystal lens is equivalent to a positive lens or a negative lens. The liquid crystal lens has the advantage of being electrically controlled and adjustable in focus because the focal length of the liquid crystal lens can be changed by changing the electric field distribution acting on the liquid crystal layer.

In the conventional liquid crystal lens, two electrodes are usually disposed on two sides of a liquid crystal layer, one of the two electrodes is a circular hole electrode, and the other electrode is a transparent electrode. An electric field inducing a non-uniform distribution of the director of the liquid crystal molecules is formed between the two electrodes by applying a driving voltage to the two electrodes. In the liquid crystal lens adopting the structure, the central area of the circular hole electrode is far away from the circular hole electrode, so that the central area of the circular hole electrode has almost no electric field. For this purpose, a high-resistance film may be provided in the circular hole electrode to guide the charges to the central region, so that the central region also has electric field distribution. However, the characteristics of the high-resistance film change with time, and thus the liquid crystal lens using the foregoing method is not stable enough in performance. Sometimes, in order to increase the aperture of the liquid crystal lens while maintaining good optical performance, a method of adding a glass substrate between two electrodes is also used, but in this way, a higher driving voltage is required to make the electric field of the liquid crystal layer satisfy the refractive index distribution for driving the liquid crystal molecules to rearrange to form a lens shape.

In more and more application scenes, optical devices are required to have smaller sizes, and therefore, liquid crystal lenses are also advancing toward miniaturization and miniaturization, and the liquid crystal lenses of the aforementioned structure have been unable to meet the requirements of miniaturization and miniaturization. In order to meet the requirement of smaller size, the liquid crystal lens element can be manufactured into a liquid crystal microlens array, wherein the liquid crystal microlens array comprises a plurality of liquid crystal microlenses (liquid crystal lenses with the aperture ranging from tens of micrometers to hundreds of micrometers), and the plurality of liquid crystal microlenses are arranged according to a certain arrangement rule. At present, the liquid crystal micro lens adopts a structural form of two electrodes and is driven by only one voltage. The liquid crystal microlens having the aforementioned structure has the following drawbacks.

1. The asymmetric angle between the rotation direction of the liquid crystal molecules and the electric field lines causes the liquid crystal molecules to be arranged with disclination lines (as shown in fig. 2).

2. Only a single-state lens (one of the positive lens or the negative lens) can be formed, and there is no effect that it is possible to switch between two states of the positive lens and the negative lens.

3. The focal length (focal power) of the lens is not monotonously increased along with the driving voltage, and the lens has great inconvenience in the use process.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a liquid crystal microlens and array, image device, fingerprint identification device, electronic equipment for it is not high to solve current liquid crystal lens optical property, and the focus is adjusted inconveniently, the performance stable technical problem inadequately.

In a first aspect, the present invention provides a liquid crystal microlens, including: first electrode unit, poroid electrode unit and second electrode unit, first electrode unit with be provided with the liquid crystal layer between the poroid electrode unit, second electrode unit be located poroid electrode unit with one side that first electrode unit is relative, poroid electrode unit with be provided with the insulating layer between the second electrode unit, the aperture less than or equal to 900 μm of poroid electrode unit.

Preferably, the pore diameter of the porous electrode unit is 10 μm or more and 400 μm or less.

Preferably, a first driving voltage is connected between the first electrode unit and the hole-shaped electrode unit, a second driving voltage is connected between the second electrode unit and the first electrode unit, and the first driving voltage and the second driving voltage are independent driving voltages.

In a second aspect, the present invention provides a liquid crystal microlens array, comprising a plurality of liquid crystal microlenses arranged in an array, wherein the liquid crystal microlenses are the first aspect of the liquid crystal microlenses.

Preferably, the hole-shaped electrode units of the plurality of liquid crystal micro lenses are arranged in a regular polygonal array.

In a third aspect, the present invention provides an imaging device, comprising an image sensor, a processor, a memory and a second aspect, wherein the processor is respectively connected to the image sensor and the memory, and the image sensor is used for collecting light passing through the liquid crystal microlens array.

The skin detection device is characterized by comprising the liquid crystal micro-lens array and an image sensor, wherein the image sensor is positioned on one side of the liquid crystal micro-lens array, which faces away from the skin to be detected. In a fifth aspect, the present invention provides a fingerprint identification device, comprising the second aspect of the liquid crystal microlens array.

Preferably, the fingerprint identification device further comprises an optical sensor, the optical sensor is located on the opposite side of the liquid crystal microlens array to the fingerprint to be identified, and the optical sensor is used for converting optical signals converged by the liquid crystal microlens into electric signals.

In a sixth aspect, the present invention provides an electronic device, comprising a display screen and the imaging device of the third aspect and/or the fingerprint recognition device of the fifth aspect.

Has the advantages that: the utility model discloses a liquid crystal microlens adopts first electrode unit, poroid electrode unit and second electrode unit's structure, can insert first drive voltage and second drive voltage and adjust the focus of liquid crystal microlens, the focus increases progressively along with drive voltage monotonously in accommodation process, it is very convenient to make the focus adjust, and the aberration is less, can also eliminate the disclination line that the contained angle direction asymmetry of liquid crystal molecule direction of rotation and electric field line caused, and realize two kinds of lens states of positive lens and negative lens, make the optical property of liquid crystal microlens obtain showing and improve. Because the utility model discloses a liquid crystal microlens has set up the insulating layer between poroid electrode unit and second electrode unit, consequently makes liquid crystal microlens can keep thinner thickness and make driving voltage show the reduction. Furthermore the utility model discloses a liquid crystal microlens has got rid of the high impedance membrane in the poroid electrode to adopt less aperture, consequently can make poroid electrode central zone have the electric field that satisfies the requirement when guaranteeing liquid crystal microlens stable performance.

The utility model discloses a liquid crystal microlens array is based on the structure of aforementioned liquid crystal microlens, consequently has the optical property excellent, and stability is high, the thin characteristics of size.

The utility model discloses an imaging device is owing to adopted aforementioned liquid crystal microlens array, consequently has the optical property excellent equally, and stability is high, and the size is thin, characteristics that the consumption is low.

The utility model discloses a fingerprint identification device owing to adopted aforementioned liquid crystal microlens array, consequently has the optical property excellent equally, and stability is high, and the focusing is convenient, and the size is thin, characteristics that the consumption is low.

The utility model discloses an electronic equipment owing to adopted aforementioned imaging device and/or fingerprint identification device, consequently has optical property excellent, and stability is high, and the focusing is convenient, and the size is thin, characteristics that the consumption is low.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings, and these drawings are all within the protection scope of the present invention.

Fig. 1 is a schematic structural view of a liquid crystal microlens of the present invention;

FIG. 2 is a schematic diagram of a liquid crystal lens with an disclination line;

FIG. 3 is a schematic diagram of a liquid crystal microlens according to the present invention for eliminating misorientation;

fig. 4 is a characteristic curve diagram of driving voltage and focal power of the liquid crystal micro lens of the present invention;

fig. 5 is a layout diagram of liquid crystal molecules when the liquid crystal micro lens of the present invention is in a positive lens or negative lens state after being applied with a driving voltage;

fig. 6 is an interference fringe image of the liquid crystal microlens of the present invention;

fig. 7 is a wave front distribution diagram of the emergent light of the liquid crystal micro lens of the present invention;

fig. 8 is a schematic structural diagram of the fingerprint recognition device of the present invention.

Parts and numbering in the drawings: the liquid crystal display device comprises a first electrode unit 11, a hole-shaped electrode unit 12, a second electrode unit 13, a liquid crystal layer 20, an insulating layer 30, a first alignment layer 41, a second alignment layer 42, a first substrate 51, a second substrate 52, a spacer 60, a liquid crystal micro-lens array 70, an optical sensor 80 and a fingerprint to be identified 90.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In case of conflict, various features of the embodiments and examples of the present invention may be combined with each other and are within the scope of the present invention.

Example 1:

as shown in fig. 1, the present embodiment provides a liquid crystal microlens, which includes a first electrode unit 11, a hole-shaped electrode unit 12, and a second electrode unit 13, wherein a liquid crystal layer 20 is disposed between the first electrode unit 11 and the hole-shaped electrode unit 12, the second electrode unit 13 is located on the opposite side of the hole-shaped electrode unit 12 from the first electrode unit 11, an insulating layer 30 is disposed between the hole-shaped electrode unit 12 and the second electrode unit 13, and the aperture (diameter of a circular hole) of the hole-shaped electrode unit 12 is less than or equal to 900 μm.

The first electrode unit 11 and the second electrode unit 13 may adopt transparent electrodes, such as ITO electrodes, AZO electrodes, and the like. The central portion of the hole-shaped electrode unit 12 is separately provided with a through hole, which may be a circular through hole, and in other embodiments, may also be other symmetrical through holes, such as a rectangular through hole, a regular polygon through hole, etc., without limitation. Wherein the first electrode unit 11 is used as a common electrode of the liquid crystal microlens, and provides a reference voltage for the hole-shaped electrode unit 12 and the second electrode unit 13. The hole-shaped electrode unit 12 and the first electrode unit 11 are separated by the liquid crystal layer 20, and the hole-shaped electrode and the second electrode unit 13 are separated by a thin insulating layer 30, so that the hole-shaped electrode and the second electrode unit 13 are insulated, and the liquid crystal micro lens can keep small thickness. And because the insulating layer 30 is thinner, the liquid crystal lens can be driven by adopting smaller voltage, so that the driving voltage is reduced to only several Vrms from the original several tens to hundreds of Vrms, and the power consumption of the system and the electrical complexity of the system are greatly reduced.

In order to form an electric field for driving the liquid crystal micro lens, in the present embodiment, a first driving voltage V1 may be applied between the first electrode unit 11 and the hole electrode unit 12, and a second driving voltage V2 may be applied between the second electrode unit 13 and the first electrode unit 11. And the first driving voltage V1 and the second driving voltage V2 are independent driving voltages, so the values of the first driving voltage V1 and the second driving voltage V2 can be adjusted independently. The present embodiment can adjust the focal length value of the liquid crystal microlens by adjusting the values of the first driving voltage V1 and the second driving voltage V2. The liquid crystal micro lens of the embodiment adopts the structure and the driving mode, so that the focal length (focal power) can be increased along with the driving voltage monotonously. The focal length adjustment is very convenient and the RMS aberration can be controlled to within 0.07 wavelength. As shown in fig. 4, the black solid data points in fig. 4 are graphs in which the power value varies with V2 when V1 is 3.5rms and the frequency is 6kHz, the power value of the graph is positive, indicating that the liquid crystal microlens is in a positive lens state and the power value monotonically decreases with a decrease in V2; the hollow data points in fig. 4 are graphs in which the optical power value varies with V1 when V2 is 2.5rms and the frequency is 6kHz, the optical power value of the graph is negative, indicating that the liquid crystal microlens is in a negative lens state and the optical power value monotonically increases with an increase in V1. By adopting the liquid crystal micro lens of the embodiment, the liquid crystal micro lens can be switched between two states of the positive lens (as shown in b in fig. 5) and the negative lens (as shown in c in fig. 5) by changing the values of the first driving voltage V1 and the second driving voltage V2, so that the liquid crystal micro lens can be used as both the positive lens to realize the convergence of light rays and the negative lens to realize the divergence effect of light rays.

Wherein the first electrode unit 11 and the second electrode unit 13 may adopt a planar electrode or a flat plate electrode. As shown in fig. 1 and 3, E in fig. 3 represents the direction of the electric field lines, n represents the direction of the incident light, and it can be seen from fig. 3 that the rotation direction of the liquid crystal molecules is the same as the direction of the included angle between the left and right electric field lines, so that no disclination line is caused. In this embodiment, a planar electrode or a flat electrode is added above the hole-shaped electrode unit 12, so that the electric field lines are approximately perpendicular in the lens region, thereby well avoiding the generation of disclination lines and forming a better optical wavefront shape.

Since the liquid crystal lens has a relatively good optical wavefront shape when the ratio of the aperture phi of the circular hole electrode to the distance d between the upper and lower electrodes of the liquid crystal layer 20 is about 3, the optical performance of the liquid crystal lens is also optimal. Therefore, in the present embodiment, the aperture diameter of the hole-shaped electrode unit 12 is set to 900 μm or less, which allows the liquid crystal microlens to maintain a thin thickness even with good optical performance. This embodiment eliminates the high resistance film that would normally be disposed in the open center region of the porous electrode when the aforementioned pore size is employed. By adopting the liquid crystal micro-lens with the aperture, the high-impedance film is removed, so that the performance of the liquid crystal micro-lens cannot be changed along with the change of the characteristics of the high-impedance film, and the central area of the opening of the porous electrode is close to the porous electrode, so that the electric field meeting the requirements can still be kept in the central area of the opening of the porous electrode. As a more preferred embodiment, the pore diameter of the porous electrode unit 12 is in the range of 10 μm.ltoreq.φ.ltoreq.400 μm.

As shown in FIG. 6, in the present embodiment, the lens characteristics were measured by interference fringes for a liquid crystal microlens having an aperture of 300 μm and a liquid crystal layer thickness of 110 μm. As can be seen from fig. 6, interference fringes appear near the center of the hole-shaped electrode, indicating that the uneven electric field can reach the vicinity of the center of the microlens of this embodiment without using a high-resistance film, causing uneven refractive index distribution at the center of the microlens. Fig. 7 is a diagram showing a wave front distribution of outgoing light after passing through the liquid crystal microlens of the present embodiment by using plane wave incidence, and it can be seen from the diagram that the wave front distribution of the outgoing light is close to that of the lens (is in a parabolic distribution in a range of-120 μm to +120 μm), and the wave front distribution of the outgoing light changes with the change of the driving voltage.

Example 2

As shown in fig. 1, this embodiment is further improved on the basis of embodiment 1, and the liquid crystal microlens of this embodiment further includes a first alignment layer 41 and a second alignment layer 42, where the first alignment layer 41 is located between the first electrode unit 11 and the liquid crystal layer 20, and the second alignment layer 42 is located between the hole-shaped electrode unit 12 and the liquid crystal layer 20. In the present embodiment, the first alignment layer 41 and the second alignment layer 42 are respectively disposed on the upper surface and the lower surface of the liquid crystal layer 20, so that the liquid crystal molecules in the liquid crystal layer 20 are aligned at a certain pretilt angle.

In addition, two transparent substrates, namely a first substrate 51 and a second substrate 52, are further provided in this embodiment, wherein the first substrate 51 is located on the side of the first electrode unit 11 opposite to the liquid crystal layer 20, and the second substrate 52 is located on the side of the second electrode unit 13 opposite to the liquid crystal layer 20. The first substrate 51 and the second substrate 52 are used as a support structure of the liquid crystal microlens element, and may be made of a transparent material having certain strength and rigidity, such as a glass substrate, a plastic substrate, or the like.

In this embodiment, the first substrate 51 and the second substrate 52 are disposed opposite to each other, and the first substrate 51, the first electrode unit 11, the first alignment layer 41, the liquid crystal layer 20, the second alignment layer 42, the circular hole electrode unit, the insulating layer 30, the second electrode unit 13, and the second substrate 52 are sequentially disposed from the first substrate 51 to the second substrate 52.

In order to maintain the shape of the liquid crystal layer 20, the present embodiment further provides a spacer 60 for supporting the liquid crystal layer 20 in the liquid crystal layer 20.

Example 3

The present embodiment provides a liquid crystal microlens array based on the foregoing embodiments, the liquid crystal microlens array includes a plurality of liquid crystal microlenses in the foregoing embodiments, and the plurality of liquid crystal microlenses are arranged in an array. Each liquid crystal microlens forming the liquid crystal microlens array comprises a hole-shaped electrode unit 12 and a second electrode unit 13, each hole-shaped electrode unit 12 can be driven by the same driving voltage, and can also be driven by different driving voltages independently, and each second electrode unit 13 can be driven by the same driving voltage, and can also be driven by different driving voltages independently. The arrangement of the liquid crystal micro lenses can be a rectangular arrangement, a regular polygon arrangement, and the like. The rectangular mode means that the geometric centers of the porous electrode units 12 are arranged at four vertex positions of the rectangle, wherein the number, length and width of the rectangles can be designed and selected according to application requirements. The regular polygon arrangement mode refers to that the geometric centers of the hole-shaped electrode units 12 are arranged at the vertex positions of the regular polygon, for example, when the regular hexagon arrangement is adopted, the geometric centers of the hole-shaped electrode units 12 are arranged at six vertex positions of the regular hexagon. The number and the side length of the regular polygons can be designed and selected according to application requirements. Wherein the number n of the regular polygon sides is more than or equal to 3.

Example 4

The present embodiment provides an imaging device, which includes an image sensor, a processor, a memory, and the liquid crystal microlens array in embodiment 3, wherein the processor is electrically connected to the image sensor and the memory, respectively, and the image sensor is configured to collect light passing through the liquid crystal microlens array. Light rays for imaging firstly pass through the liquid crystal micro-lens array, then are collected by the image sensor and are converted into electric signals, and the electric signals obtained through conversion are sent to the processor for processing. The imaging device in the embodiment adopts the liquid crystal micro-lens array, so that the optical performance is excellent, the imaging effect is good, the focusing is convenient, the device stability is high, the size is small, and the power consumption is low. The imaging device in the embodiment is thin in size and convenient to focus, and therefore can be arranged below the display screen to be used as a camera under the screen.

Example 5

This embodiment provides a fingerprint recognition device including the liquid crystal microlens array described in embodiment 3. FoD (screen fingerprint) is always a key biological identification function, and is increasingly applied to the fields of mobile phones, flat panels and other electronic products with display screens. Thinner microlens technology is particularly critical in underscreen fingerprint identification applications due to limitations in product thickness. Because the fingerprint identification device of this embodiment has adopted aforementioned liquid crystal microlens array as the optical element of fingerprint identification, therefore this fingerprint identification device has optical property height, and the stable performance can conveniently realize automatically controlled focusing, is favorable to the fingerprint to discern fast accurately, and whole device has thickness thin, advantage that the consumption is low. As shown in fig. 8, the fingerprint identification device in this embodiment further includes an optical sensor 80, the optical sensor 80 is located at a side of the liquid crystal microlens array 70 opposite to the fingerprint 90 to be identified, and the optical sensor 80 is configured to convert the optical signal converged by the liquid crystal microlens array 70 into an electrical signal. The thickness of screens of different specifications or models is often different, and the consumer often pastes the protection film according to self demand at the plane surface, causes the distance between fingerprint and the fingerprint identification module that awaits measuring to change, and the focus of the fingerprint identification module that adopts ordinary microlens is difficult to adjust, consequently can't adapt to the screen of different thickness to influence fingerprint identification's effect behind the pad pasting.

Example 6

This embodiment provides an electronic device including a display screen and the imaging device described in embodiment 4 or the fingerprint recognition device described in embodiment 5. The electronic device can be a digital mobile phone (mobile phone), a tablet computer, an intelligent touch display device and the like, and the imaging device and the fingerprint identification device can be arranged below the display screen. Because the electronic device in this embodiment adopts the aforementioned imaging device or fingerprint identification device, the electronic device also has the advantages brought by the aforementioned fingerprint identification device and imaging device.

Example 7

The present embodiment provides a skin detection device, which includes the liquid crystal microlens array and the image sensor in the foregoing embodiments, where the image sensor is located on a side of the liquid crystal microlens array facing away from the skin to be detected. The skin detection device in this embodiment presses a detection head with a liquid crystal microlens array close to the skin surface to be detected, light reflected by the skin surface passes through the liquid crystal microlens array and then is collected by an image sensor, so that detailed information of the skin can be obtained, and the health condition of the skin can be known in time through analysis of the detailed information of the skin.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A liquid crystal microlens, comprising: first electrode unit, poroid electrode unit and second electrode unit, first electrode unit with be provided with the liquid crystal layer between the poroid electrode unit, second electrode unit be located poroid electrode unit with one side that first electrode unit is relative, poroid electrode unit with be provided with the insulating layer between the second electrode unit, the aperture less than or equal to 900 μm of poroid electrode unit.

2. The liquid crystal microlens of claim 1, wherein the aperture of the hole-shaped electrode unit is 10 μm or more and 400 μm or less.

3. The liquid crystal microlens of claim 1 or 2, wherein a first driving voltage is applied between the first electrode unit and the hole-shaped electrode unit, a second driving voltage is applied between the second electrode unit and the first electrode unit, and the first driving voltage and the second driving voltage are independent driving voltages.

4. The liquid crystal microlens array is characterized by comprising a plurality of liquid crystal microlenses arranged in an array, wherein the liquid crystal microlenses are the liquid crystal microlenses according to any one of claims 1 to 3.

5. The liquid crystal microlens array of claim 4, wherein the hole-shaped electrode units of the plurality of liquid crystal microlenses are arranged in a regular polygonal array.

6. An imaging device comprising an image sensor, a processor, a memory and the liquid crystal microlens array of claim 4 or 5, wherein the processor is electrically connected to the image sensor and the memory, respectively, and the image sensor is configured to collect light passing through the liquid crystal microlens array.

7. Skin detection device, characterized in that it comprises a liquid crystal microlens array according to claim 4 or 5 and an image sensor, said image sensor being located on the side of the liquid crystal microlens array facing away from the skin to be detected.

8. Fingerprint identification device, its characterized in that: comprising the liquid crystal microlens array of claim 4 or 5.

9. The fingerprint recognition device of claim 8, wherein: the fingerprint identification device further comprises an optical sensor, the optical sensor is located on one side, opposite to the fingerprint to be identified, of the liquid crystal micro lens array, and the optical sensor is used for converting optical signals converged by the liquid crystal micro lens into electric signals.

10. Electronic equipment, characterized in that it comprises a display screen and an imaging device according to claim 6 and/or a fingerprint recognition device according to claim 8 or 9.

Images