Glasses and control method thereof

Abstract

The invention belongs to the technical field of optics, and particularly relates to glasses and a control method thereof. The glasses of the present invention comprise: a frame; the lens is mounted on the frame, and the lens comprises a first liquid crystal lens of which the focal power can be electrically controlled and adjusted; the detection unit is mounted on the frame, the detection unit comprises an image acquisition module, the image acquisition module comprises a second liquid crystal lens of which the focal power can be electrically controlled and adjusted, and the detection unit is used for detecting the focal power variation for imaging a target object at a preset definition; and the control circuit is electrically connected with the first liquid crystal lens and the detection unit, and the control circuit is used for controlling the first liquid crystal lens to adjust the focal power of the first liquid crystal lens according to the focal power variation. The traditional Chinese medicine composition can effectively relieve eye fatigue of people.

Description

Technical Field

[0001] The invention belongs to the field of optical technology, and in particular relates to a pair of glasses and a control method thereof. Background Art

[0002] In order to see the target object clearly, people need to make the object clearly imaged on the retina of the eye. Since different objects are often at different distances from the human eye, the human body's ciliary muscles, lens and other eye tissues will adjust according to the distance of the object observed by the human eye, so that the observed object can form a clear image on the retina. Therefore, it is easy to cause fatigue of these eye tissues when performing meticulous assembly work, reading, watching mobile phones and other long-term high-intensity eye use. For patients with myopia, presbyopia, and myopia and presbyopia at the same time, it is more likely to cause fatigue of eye tissues, thereby damaging eye health. In this regard, relevant technical personnel have proposed to set a device that can adjust the degree of the lens on the lens of the glasses. This device can adjust the degree of the lens according to the distance between the object observed by the user and the glasses to reduce the intensity of the eye tissue adjustment, thereby effectively relieving the fatigue of the user's eyes. For example, in the patent with the publication number: CN1653374A, an electro-optical lens with an integrated component is proposed. The patent uses a distance measuring device to detect the observation distance of the observed target, and then controls the electro-excitation lens to adjust the focal length. Although this patent can automatically adjust the focal length according to the distance of the observed target, this technology requires a pair of transmitters and receivers for detecting the distance. When measuring the distance, the transmitter needs to emit a light beam to the target and the receiver needs to receive the reflected light beam. During the emission and reception process, the light beam is easily affected by external interference, which affects the stability of the distance measurement. Summary of the invention

[0003] In view of this, the present invention provides a pair of glasses and a control method thereof to solve the technical problem in the prior art that the glasses capable of auto-focusing are easily disturbed during the process of detecting the distance of an observed object and have a relatively complex structure.

[0004] The technical solution adopted by the present invention is:

[0005] In a first aspect, the present invention provides a pair of glasses, comprising:

[0006] frame;

[0007] A lens, mounted on the frame, comprising a first liquid crystal lens with electrically adjustable focal length;

[0008] A detection unit, mounted on the frame, comprising an image acquisition module, the image acquisition module comprising a second liquid crystal lens with electrically adjustable focal length, and used to detect a change in focal length for imaging a target object with a preset definition;

[0009] The control circuit is electrically connected to the first liquid crystal lens and the detection unit respectively, and the control circuit is used to control the first liquid crystal lens to adjust the optical power of the first liquid crystal lens according to the optical power change amount.

[0010] Preferably, the first liquid crystal lens comprises a first substrate, a first electrode layer, a liquid crystal layer, a second electrode layer and a second substrate which are stacked in sequence;

[0011] The first electrode layer is a surface electrode;

[0012] The second electrode layer includes a plurality of electrode units arranged in sequence from the center of the second electrode layer to the edge of the second electrode layer, each electrode unit includes a conductive line extending from an end close to the center of the second electrode layer to an end away from the second electrode layer, and opposite ends of the conductive line are respectively loaded with a first driving voltage and a second driving voltage;

[0013] The plurality of electrode units are configured to enable the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to that of a Fresnel lens under the action of the first driving voltage and the second driving voltage.

[0014] Preferably, the conductive wire comprises a plurality of connecting segments and a plurality of concentric arc segments with gradually increasing radii, adjacent concentric arc segments are connected by the connecting segments, and the plurality of concentric arc segments are arranged at equal intervals.

[0015] Preferably, it also includes an eye movement tracking device, which is installed on the frame, and the control circuit is electrically connected to the eye movement tracking device, and the eye movement tracking device is used to track the user's eye movement. The control circuit determines the target object that the user is looking at based on the user's eye movement and the image captured by the image acquisition module.

[0016] Preferably, the eye movement tracking device includes an infrared transmitter and an infrared sensor, the infrared sensor is used to send infrared rays to the user's eyes, the infrared sensor is used to receive infrared images reflected by the user's eyes, and the control circuit tracks the user's eye movement based on the infrared images.

[0017] In a second aspect, the present invention provides a glasses control method, wherein the glasses control method is used to control the glasses described in the first aspect, and comprises the following steps:

[0018] S1: Acquire initial parameters corresponding to the user, where the initial parameters include an initial optical focal length of a first liquid crystal lens and an initial optical focal length of a second liquid crystal lens.

[0019] S2: Control the detection unit to focus on the target object, and obtain the optical power of the second liquid crystal lens during focusing.

[0020] S3: determining a change in the focal power of the second liquid crystal lens according to the focal power of the second liquid crystal lens during focusing and the initial focal power of the second liquid crystal lens;

[0021] S4: determining the focal power change amount of the first liquid crystal lens according to the focal power change amount of the second liquid crystal lens, so that the focal power change amount of the first liquid crystal lens is equal to the focal power change amount of the second liquid crystal lens;

[0022] S5: determining a target focal power of the first liquid crystal lens according to a focal power change amount of the first liquid crystal lens and an initial focal power of the first liquid crystal lens;

[0023] S6: Control the first liquid crystal lens to adjust to the target optical focal length.

[0024] Preferably, the step S1: acquiring initial parameters corresponding to the user, wherein the initial parameters include an initial optical focal length of the first liquid crystal lens and an initial optical focal length of the second liquid crystal lens, further includes:

[0025] S11: recording the optical power of the second liquid crystal lens when a target object at a predetermined distance observed by the user wearing the glasses is imaged with a preset definition in the image acquisition module as the initial optical power of the second liquid crystal lens;

[0026] S12: Recording the optical power of the first liquid crystal lens of the lens corresponding to the eye when the user sees the target object clearly with one eye as the initial optical power of the first liquid crystal lens in the lens.

[0027] Preferably, the step S3: determining the change in the focal power of the second liquid crystal lens according to the focal power of the second liquid crystal lens during focusing and the initial focal power of the first liquid crystal lens further comprises:

[0028] S31: Acquiring a driving voltage of the second liquid crystal lens during focusing;

[0029] S32: Acquire a correspondence between a driving voltage and an optical power of the second liquid crystal lens as a second correspondence;

[0030] S33: determining the focal length of the second liquid crystal lens during focusing according to the driving voltage of the second liquid crystal lens during focusing and the second corresponding relationship;

[0031] S34: subtracting the initial focal power of the second liquid crystal lens from the focal power of the second liquid crystal lens during focusing to obtain a focal power change of the second liquid crystal lens.

[0032] Preferably, the step S6: controlling the first liquid crystal lens to adjust to the target optical power further comprises:

[0033] S61: Acquire a correspondence between the focal length of the first liquid crystal lens and the driving voltage of the first liquid crystal lens as a first correspondence;

[0034] S62: acquiring a driving voltage of the first liquid crystal lens corresponding to the target optical power as a target driving voltage according to the target optical power and the first corresponding relationship;

[0035] S63: driving the first liquid crystal lens with a target driving voltage.

[0036] Preferably, the step S2: controlling the detection unit to focus on the target object, and obtaining the optical power of the second liquid crystal lens during focusing further comprises:

[0037] S21: Obtaining user eye movement data;

[0038] S22: Determine the gaze point of the user's eyeball according to the user's eyeball movement data;

[0039] S23: Acquire a scene image within the user's field of view;

[0040] S24: determining a target object in the scene image according to the scene image within the user's field of view and the gaze point of the user's eyeball;

[0041] S25: adjusting the focal length of the second liquid crystal lens so that the target object is imaged with a preset definition in the image acquisition module, and obtaining the focal length of the target object when imaged with the preset definition as the focal length of the second liquid crystal lens during focusing.

[0042] Beneficial effects: The glasses and control method of the present invention adjust the degree of the glasses lens through the first liquid lens set on the glasses lens, so that the degree of the glasses lens is adapted to the distance between the user's glasses and the target object, so that the target object can be imaged on the user's retina with a preset clarity without the need for the eye tissue to adjust at a higher intensity, thereby significantly reducing the adjustment intensity of the eye tissue and effectively alleviating eye fatigue. Since the present invention uses the second liquid crystal lens of the detection unit to directly detect the change in optical power, and the control circuit directly controls the first liquid crystal lens on the lens to automatically focus according to the change in optical power, the present invention does not need to emit infrared rays to the target object, so there is no need to add additional transmitters and receivers, and interference can be avoided during the infrared emission process, thereby improving the reliability of the system and the clarity of the target object imaged on the retina. In addition, the detection unit of the present invention can also use the existing image acquisition module in the glasses for detection, and use the image acquisition module to simultaneously realize the functions of detection and image acquisition, thereby further saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0044] Figure 1 is a schematic structural diagram of the glasses of the present invention;

[0045] Figure 2 is a structural block diagram of the control circuit in the present invention;

[0046] Figure 3 is a cross-sectional view of a first liquid crystal lens of the present invention;

[0047] Figure 4 is a schematic structural diagram of the second electrode layer of the first liquid crystal lens in the present invention;

[0048] Figure 5 is a flow chart of the glasses control method of the present invention;

[0049] Figure 6 It is a flowchart of the method for obtaining the initial parameters of the user of the glasses in the present invention;

[0050] Figure 7 A schematic flow chart of a method for determining the optical focal length of a second liquid crystal lens in the present invention;

[0051] Figure 8 It is a schematic flow chart of the method for controlling the liquid crystal lens to adjust to the target optical focal length in the present invention;

[0052] Fig. 9 The present invention is a flow chart of a method for a detection unit to obtain the optical focal length of a second liquid crystal lens during focusing. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described in combination with the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, all within the protection scope of the present invention.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment provides a pair of glasses, and the glasses in this embodiment mainly include a frame 10, a lens 20, a detection unit 30 and a control circuit 40:

[0056] The frame 10 is mainly used to install other parts of the glasses. In specific implementation, the frame 10 mainly includes two lens frames 20, two temples and a connecting part connecting the two lens frames 20.

[0057] The lens 20 is mounted on the frame 10, and the lens 20 includes a first liquid crystal lens 50 whose optical focal length can be electrically controlled and adjusted; in specific implementation, it includes two lenses 20 for the left eye and the right eye, and the lenses 20 on both sides are respectively mounted on the two lens 20 frames. In this embodiment, the first liquid crystal lens 50 can be used as the lens 20, or a glass lens 20 and / or a plastic lens 20 with a certain degree can be superimposed with the first liquid crystal lens 50 to form the lens 20. Since the optical focal length of the first liquid crystal lens 50 can be adjusted by adjusting the driving voltage of the first liquid crystal lens 50, the degree of the lens 20 can be controlled by controlling the driving voltage of the first liquid crystal lens 50 in this embodiment, wherein the optical focal length of the first liquid crystal lens 50 of the left eye lens 20 and the first liquid crystal lens 50 of the right eye lens 20 can be adjusted independently, thereby realizing independent adjustment of the degrees of the left eye lens 20 and the right eye lens 20.

[0058] The detection unit 30 is mounted on the frame 10, and includes an image acquisition module, which includes a second liquid crystal lens with electrically adjustable focal length, and is used to detect the change in focal length for imaging the target object with a preset definition;

[0059] The preset clarity can be set according to the clarity requirement of the imaging quality.

[0060] The image acquisition module at least includes an image sensor. The light of the scene observed by the user is modulated by the second liquid crystal lens and then captured by the image sensor, thereby obtaining an image of the scene. In order to achieve a better optical effect, several ordinary lenses can also be set on the path of light propagation to the image sensor.

[0061] The optical focal length of the second liquid crystal lens is adjusted by driving the driving voltage of the second liquid crystal lens. The aforementioned optical focal length change amount that enables the target object to be imaged with a preset definition is the change amount of the optical focal length when the light emitted by the target object passes through the second liquid crystal lens and is imaged with a preset definition in the image acquisition module compared to the initial optical focal length of the second liquid crystal lens. The initial optical focal length of the second liquid crystal lens can be obtained when the user wears the glasses for the first time and obtains the user's usage parameters.

[0062] The control circuit 40 is electrically connected to the first liquid crystal lens 50 and the detection unit 30 respectively, and the control circuit 40 is used to control the first liquid crystal lens 50 to adjust the optical power of the first lens according to the optical power change amount.

[0063] The optical power variation detected by the detection unit 30 is transmitted to the control circuit 40, and the control circuit 40 directly adjusts the optical power of the first liquid crystal lens 50 according to the received optical power variation. Since this embodiment does not need to transmit a signal to the target object and receive a reflected signal to measure the distance of the target object, the interference in the signal transmission and reception process is effectively avoided, so that the reliability of the glasses auto-focusing is significantly improved.

[0064] like Figure 2 As shown, the control circuit 40 includes at least one processor 401 and at least one memory 402. Specifically, the processor 401 may be a central processing unit 401 (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present invention.

[0065] The memory 402 may include a large capacity memory 402 for data or instructions. By way of example and not limitation, the memory 402 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 402 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 402 may be inside or outside the data processing device. In a specific embodiment, the memory 402 is a non-volatile solid-state memory 402. In a specific embodiment, the memory 402 includes a read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0066] The processor 401 implements the control method in the above-mentioned embodiment by reading and executing the computer program instructions stored in the memory 402 .

[0067] In one example, the control circuit 40 of this embodiment may further include a communication interface 403 and a bus, wherein the processor 401, the memory 402, and the communication interface 403 are connected through the bus and communicate with each other.

[0068] The communication interface 403 is mainly used to implement the communication between the modules, devices, units and / or equipment in the embodiment of the present invention.

[0069] The bus includes hardware, software, or both, coupling the various components used to control circuit 40 to each other. By way of example and not limitation, the bus may include an accelerated graphics port (AGP) or other graphics bus, an enhanced industry standard architecture (EISA) bus, a front side bus (FSB), a hypertransport (HT) interconnect, an industry standard architecture (ISA) bus, an infinite bandwidth interconnect, a low pin count (LPC) bus, a memory 402 bus, a microchannel architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standard association local (VLB) bus, or other suitable buses or a combination of two or more of these. Where appropriate, bus 410 may include one or more buses. Although embodiments of the present invention describe and illustrate specific buses, the present invention contemplates any suitable bus or interconnect.

[0070] like Figure 3 As shown, as an example, in this embodiment, the first liquid crystal lens 50 includes a first substrate 51, a first electrode layer 52, a liquid crystal layer 53, a second electrode layer 54 and a second substrate 55 which are stacked in sequence;

[0071] The first electrode layer 52 is a surface electrode;

[0072] The second electrode layer 54 includes a plurality of electrode units 521 arranged in sequence from the center of the second electrode layer 54 to the edge of the second electrode layer 54, each electrode unit 521 includes a conductive line extending from an end close to the center of the second electrode layer 54 to an end away from the second electrode layer 54, and the first driving voltage and the second driving voltage are respectively applied at opposite ends of the conductive line;

[0073] When the first driving voltage and the second driving voltage are applied to both ends of the electrode unit 521 , respectively, a potential distribution with a gradient change from the position of the electrode unit 521 toward the center to the position of the electrode unit 521 away from the center will be generated on the conductive line.

[0074] The plurality of electrode units 521 are configured to make the liquid crystal in the liquid crystal layer 53 form a phase distribution equivalent to that of a Fresnel lens under the action of the first driving voltage and the second driving voltage. The phase distribution equivalent to that of a Fresnel lens means that the limiting delay distribution after the light passes through the liquid crystal layer 53 is the same as the phase distribution after the light passes through the Fresnel lens.

[0075] The aforementioned liquid crystal lens can form a Fresnel liquid crystal lens after the first driving voltage and the second driving voltage are applied. The area controlled by each electrode unit 521 after the driving voltage is applied corresponds to a liquid crystal Fresnel ring zone, and the width of each electrode unit 521 is the same as the width of the corresponding Fresnel zone. Assume that the width of the i-th electrode unit 521 arranged from the center to the edge of the second electrode layer 54 is w i , where w0 is the width of the electrode unit 521 (the first electrode unit 521) at the center, then w i =w0(i 1 / 2 -(i-1) 1 / 2 ), wherein i is a positive integer greater than or equal to 2, and the larger the value of i is, the closer the electrode unit 521 is to the edge of the second electrode layer 54.

[0076] like Figure 4 As shown, in this embodiment, the conductive line includes a plurality of connecting segments and a plurality of concentric arc segments with gradually increasing radii, adjacent concentric arc segments are connected by the connecting segments, and the plurality of concentric arc segments are arranged at equal intervals.

[0077] Since the conductive wires in the electrode unit 521 in this embodiment adopt the structure of the aforementioned concentric arc segments, when the electrode unit 521 is loaded with a driving voltage, an accurate electric potential distribution in the form of a rotating parabola can be generated, thereby forming a high-precision Fresnel liquid crystal lens. In addition, the liquid crystal lens of this structure has a faster response speed, generally within the range of 10-500 milliseconds, so that the first liquid crystal lens 50 can quickly focus on the target object and accurately obtain the amount of optical focal length change.

[0078] In this embodiment, the second liquid crystal lens and the first liquid crystal lens can have the same structure or different structures, which is not limited here. In addition to the aforementioned structure, this embodiment can also adopt other structures of liquid crystal lenses that can realize electrically controlled adjustment of optical focal length.

[0079] Since there are often multiple objects in the user's field of view, the present embodiment can filter out the object that the user wants to observe from these objects as the target object for focusing. As one example, the image acquisition module of the detection unit 30 can be installed on the connecting part between the two lens frames 20, so that the image acquisition module is located in the middle of the glasses frame 10. When using it, the user turns his head to the angle corresponding to the target object, and the system defaults that the object closest to the glasses is the target object that the user wants to observe.

[0080] In actual applications, users observe objects in different directions by rotating their eyeballs. At this time, the method of assuming that the object closest to the glasses is the target object cannot fully meet the user's usage needs. In this regard, in the present embodiment, the glasses also include an eye movement tracking device, which is mounted on the frame 10. The control circuit 40 is electrically connected to the eye movement tracking device, and the eye movement tracking device is used to track the user's eye movement. The control circuit 40 determines the target object that the user is looking at based on the user's eye movement and the image captured by the image acquisition module.

[0081] When the control circuit 40 detects the target object that the user is looking at, it can control the detection unit 30 to focus on the target object that the user is looking at, so as to obtain the optical power change amount of the second liquid crystal lens when the target object is in sharp focus. Then, the optical power of the first liquid crystal lens 50 in the lens 20 is adjusted according to the obtained optical power change amount, so that the object currently observed by the user can be clearly imaged on the user's retina.

[0082] In this embodiment, the eye movement tracking device includes an infrared transmitter and an infrared sensor. The infrared sensor is used to send infrared rays to the user's eyes, and the infrared sensor is used to receive infrared images reflected by the user's eyes. The control circuit 40 tracks the user's eye movement based on the infrared image.

[0083] The eye movement tracking device can be installed on the side of the eyeglass frame 10 facing the user's eyeball, so that the infrared light emitted by the eye movement tracking device can reach the position of the user's eyeball. The eye movement tracking device includes one or more infrared LED light sources, which emit invisible infrared light to illuminate the user's eyes. Infrared light has little interference with ambient light and will not make the user feel uncomfortable.

[0084] Example 2

[0085] like Figure 5 As shown, this embodiment provides a glasses control method for controlling the glasses described in Embodiment 1, and the method comprises the following steps:

[0086] S1: Acquire initial parameters corresponding to the user, where the initial parameters include the initial optical power of the second liquid crystal lens and the initial optical power of the first liquid crystal lens 50 .

[0087] The initial optical power of the second liquid crystal lens is the optical power of the second liquid crystal lens when imaging an object at a set distance with a preset clarity, and the initial optical power of the first liquid crystal lens 50 is the optical power of the first liquid crystal lens 50 when a user can clearly see an object at a set distance through the lens 20 provided with the first liquid crystal lens 50. Since the lens 20 of the glasses is usually divided into two left and right lenses 20, the initial optical power of the liquid crystal lenses in the left and right lenses 20 may be different, and in this case, the initial optical power of the liquid crystal lenses in the left and right lenses 20 needs to be obtained respectively.

[0088] S2: Control the detection unit 30 to focus on the target object, and obtain the optical power of the second liquid crystal lens during focusing.

[0089] This step controls the zoom of the second liquid crystal lens in the detection unit 30. When the detection unit 30 can capture a clear image of the target object, it can be considered that the detection unit 30 has completed the focusing on the target object. At this time, the optical focal length of the current second liquid crystal lens is recorded as the optical focal length of the second liquid crystal lens during focusing.

[0090] S3: determining a change in the focal power of the second liquid crystal lens according to the focal power of the second liquid crystal lens during focusing and the initial focal power of the second liquid crystal lens;

[0091] The change in the focal length of the second liquid crystal lens is equal to the focal length of the second liquid crystal lens during focusing minus the initial focal length of the second liquid crystal lens.

[0092] S4: determining the focal power change amount of the first liquid crystal lens 50 according to the focal power change amount of the second liquid crystal lens, so that the focal power change amount of the first liquid crystal lens 50 is equal to the focal power change amount of the second liquid crystal lens;

[0093] S5: determining a target optical power of the first liquid crystal lens 50 according to the optical power change amount of the first liquid crystal lens 50 and the initial optical power of the first liquid crystal lens 50;

[0094] The target optical power of the first liquid crystal lens 50 is equal to the optical power change amount of the first liquid crystal lens 50 plus the initial optical power of the first liquid crystal lens 50 .

[0095] S6: Control the first liquid crystal lens 50 to adjust to the target optical power.

[0096] Since the change in the optical focal length of the first liquid crystal lens 50 is equal to that of the second liquid crystal lens, and the first detection unit 30 can obtain a clear image of the target object, the target object can also form a clear image on the retina after the first liquid crystal lens 50 is adjusted to the target optical focal length.

[0097] like Figure 6As shown, as one example, in this embodiment S1: the initial parameters corresponding to the user are obtained, and the initial parameters include the initial optical focal length of the second liquid crystal lens and the initial optical focal length of the first liquid crystal lens 50, and further include:

[0098] S11: The user wears the glasses and observes a target object at a predetermined distance, and records the optical power of the second liquid crystal lens when the target object is imaged with a preset definition in the image acquisition module as the initial optical power of the second liquid crystal lens;

[0099] The predetermined distance may be set based on experience, for example, a distance of about 1 meter from the glasses may be set as the predetermined distance.

[0100] S12 : recording the optical focal length of the first liquid crystal lens 50 of the lens 20 corresponding to the eye when the user sees the target object clearly with one eye as the optical focal length of the first liquid crystal lens 50 in the lens 20 .

[0101] In order to improve the accuracy of obtaining the initial optical focal length, the present embodiment adopts a method of separately obtaining the optical focal lengths of the left and right lenses 20. In the specific operation, a method of observing an object with one eye is adopted. The user observes the target object with only one eye, and the optical focal length of the first liquid crystal lens 50 is adjusted by the control circuit 40 until the user's currently used eye can see the target object clearly, and the current optical focal length is recorded as the initial optical focal length, and the focusing of the lens 20 corresponding to the current eye is completed, and then the focusing of the lens 20 corresponding to the other eye is completed in the same way, and the current optical focal length is recorded as the initial optical focal length.

[0102] like Figure 7 As shown, in this embodiment, the S3: determining the change in the optical power of the second liquid crystal lens according to the optical power of the second liquid crystal lens during focusing and the initial optical power of the second liquid crystal lens also includes:

[0103] S31: Acquiring a driving voltage of the second liquid crystal lens during focusing;

[0104] Assuming that the first driving voltage of the second liquid crystal lens during focusing is v1, and the second driving voltage is v2, then the driving voltage of the second liquid crystal lens Δv0=v2-v1.

[0105] S32: Acquire a correspondence between a driving voltage and an optical power of the second liquid crystal lens as a second correspondence;

[0106] The corresponding relationship between the driving voltage and the optical power refers to the optical power of the second liquid crystal lens corresponding to when a certain driving voltage is applied to the second liquid crystal lens.

[0107] S33: determining the focal length of the second liquid crystal lens during focusing according to the driving voltage of the second liquid crystal lens during focusing and the second corresponding relationship;

[0108] In this step, the optical power of the second liquid crystal lens corresponding to the driving voltage of the second liquid crystal lens when focusing is found through the second corresponding relationship.

[0109] S34: subtracting the initial focal power of the second liquid crystal lens from the focal power of the second liquid crystal lens during focusing to obtain a focal power change of the second liquid crystal lens.

[0110] like Figure 8 As shown, in this embodiment, the step S6: controlling the first liquid crystal lens 50 to adjust to the target optical focal length further includes:

[0111] S61: Acquire a correspondence between the focal length of the first liquid crystal lens 50 and the driving voltage of the first liquid crystal lens 50 as a first correspondence;

[0112] The corresponding relationship between the optical power of the first liquid crystal lens 50 and the driving voltage of the first liquid crystal lens 50 refers to the optical power of the first liquid crystal lens 50 corresponding to when a certain driving voltage is applied to the first liquid crystal lens 50 .

[0113] S62: acquiring a driving voltage of the first liquid crystal lens 50 corresponding to the target optical power as a target driving voltage according to the target optical power and the first corresponding relationship;

[0114] S63: driving the first liquid crystal lens 50 with the target driving voltage.

[0115] like Fig. 9 As shown, in order to improve the accuracy of focusing, in this embodiment, S2: controlling the detection unit 30 to focus on the target object, and obtaining the optical power of the second liquid crystal lens during focusing also includes:

[0116] S21: Obtaining user eye movement data;

[0117] In a specific implementation, an eye movement tracking device installed on the glasses frame 10 may be used to obtain the user's eye movement data.

[0118] To improve the accuracy of capturing the user's eye movements, the eye movement tracking device can be initially calibrated so that the tracking device can accurately identify the user's eye movements. The initial calibration allows the user to look at multiple points on the screen to establish a reference model of the eye movement.

[0119] S22: Determine the gaze point of the user's eyeball according to the user's eyeball movement data;

[0120] When the user uses the glasses, the sensor will continue to track the user's eye movement and determine the area the user is currently looking at. The control circuit 40 analyzes these data in real time to determine the exact position of the user's gaze. The human eyeball consists of a cornea and a pupil. After infrared light is irradiated to the eyeball, part of the light will be reflected back by the cornea, and the sensor captures these reflected lights. Because the pupil absorbs infrared light, it usually appears as a black area in the sensor image, and the reflected light will form a highlight on the cornea. The infrared sensor captures the image of the reflected light from the eyeball through a high-frame rate camera. The camera needs to have a high resolution and a high frame rate to ensure that the subtle movements of the eyeball can be accurately captured. The control circuit 40 receives the captured eyeball images from the infrared sensor and pre-processes these images. Pre-processing includes denoising, enhancing contrast, and filtering out unnecessary background information. The control circuit 40 can use an image processing algorithm to identify key feature points of the eyeball, where the key feature points include but are not limited to the center of the pupil and the corneal reflected light point.

[0121] S23: Acquire a scene image within the user's field of view;

[0122] S24: determining a target object in the scene image according to the scene image within the user's field of view and the gaze point of the user's eyeball;

[0123] This step can record the position of the feature points when the user is looking at a known position within the visual field, and establish a reference model based on these data. When used specifically, the position of the feature points can be used to find the corresponding position within the visual field that the user is looking at, and then the object at that position can be found from the scene image as the target object.

[0124] S25: adjusting the focal length of the second liquid crystal lens so that the target object is imaged with a preset definition in the image acquisition module, and obtaining the focal length of the target object when imaged with the preset definition as the focal length of the second liquid crystal lens during focusing.

[0125] After adopting the above method, this embodiment can timely acquire the target object observed by the user, and then automatically focus according to the target object.

[0126] The above is a detailed introduction to the glasses and the glasses control method provided by the embodiments of the present invention.

[0127] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figure. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiment, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention. The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link via a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network such as the Internet, an intranet, etc. It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0128] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. Glasses, characterized in that include: frame; A lens, mounted on the frame, comprising a first liquid crystal lens with electrically adjustable focal length; A detection unit, mounted on the frame, comprising an image acquisition module, the image acquisition module comprising a second liquid crystal lens with electrically adjustable focal length, and used to detect a change in focal length for imaging a target object with a preset definition; The control circuit is electrically connected to the first liquid crystal lens and the detection unit respectively, and the control circuit is used to adjust the optical power of the first liquid crystal lens according to the optical power change amount.

2. The glasses according to claim 1, characterized in that The first liquid crystal lens comprises a first substrate, a first electrode layer, a liquid crystal layer, a second electrode layer and a second substrate which are stacked in sequence; The first electrode layer is a surface electrode; The second electrode layer includes a plurality of electrode units arranged in sequence from the center of the second electrode layer to the edge of the second electrode layer, each electrode unit includes a conductive line extending from an end close to the center of the second electrode layer to an end away from the second electrode layer, and opposite ends of the conductive line are respectively loaded with a first driving voltage and a second driving voltage; The plurality of electrode units are configured to enable the liquid crystal in the liquid crystal layer to form a phase distribution equivalent to that of a Fresnel lens under the action of the first driving voltage and the second driving voltage.

3. The glasses according to claim 1, characterized in that: The conductive wire includes a plurality of connecting segments and a plurality of concentric arc segments with gradually increasing radii. Adjacent concentric arc segments are connected by the connecting segments, and the concentric arc segments are arranged at equal intervals.

4. The glasses according to any one of claims 1 to 3, characterized in that: It also includes an eye movement tracking device, which is installed on the frame. The control circuit is electrically connected to the eye movement tracking device. The eye movement tracking device is used to track the user's eye movement. The control circuit determines the target object that the user is looking at based on the user's eye movement and the image captured by the image acquisition module.

5. The glasses according to claim 4, characterized in that: The eye movement tracking device includes an infrared transmitter and an infrared sensor. The infrared sensor is used to send infrared rays to the user's eyes. The infrared sensor is used to receive infrared images reflected by the user's eyes. The control circuit tracks the user's eye movement based on the infrared images.

6. A glasses control method, characterized in that: Used to control the glasses according to any one of claims 1 to 5, characterized in that it comprises the following steps: S1: Acquire initial parameters corresponding to the user, where the initial parameters include an initial optical focal length of a first liquid crystal lens and an initial optical focal length of a second liquid crystal lens. S2: Control the detection unit to focus on the target object, and obtain the optical power of the second liquid crystal lens during focusing. S3: determining a change in the focal power of the second liquid crystal lens according to the focal power of the second liquid crystal lens during focusing and the initial focal power of the second liquid crystal lens; S4: determining the focal power change amount of the first liquid crystal lens according to the focal power change amount of the second liquid crystal lens, so that the focal power change amount of the first liquid crystal lens is equal to the focal power change amount of the second liquid crystal lens; S5: determining a target focal power of the first liquid crystal lens according to a focal power change amount of the first liquid crystal lens and an initial focal power of the first liquid crystal lens; S6: Control the first liquid crystal lens to adjust to the target optical focal length.

7. The glasses control method according to claim 6, characterized in that: S1: acquiring initial parameters corresponding to the user, wherein the initial parameters include the initial optical focal length of the first liquid crystal lens and the initial optical focal length of the second liquid crystal lens, and further includes: S11: recording the optical power of the second liquid crystal lens when a target object at a predetermined distance observed by the user wearing the glasses is imaged with a preset definition in the image acquisition module as the initial optical power of the second liquid crystal lens; S12: Recording the optical power of the first liquid crystal lens of the lens corresponding to the eye when the user sees the target object clearly with one eye as the initial optical power of the first liquid crystal lens in the lens.

8. The glasses control method according to claim 6, characterized in that: The step S3: determining the change in the focal power of the second liquid crystal lens according to the focal power of the second liquid crystal lens during focusing and the initial focal power of the second liquid crystal lens also includes: S31: Acquiring a driving voltage of the second liquid crystal lens during focusing; S32: Acquire a correspondence between a driving voltage and an optical power of the second liquid crystal lens as a second correspondence; S33: determining the focal length of the second liquid crystal lens during focusing according to the driving voltage of the second liquid crystal lens during focusing and the second corresponding relationship; S34: subtracting the initial focal power of the second liquid crystal lens from the focal power of the second liquid crystal lens during focusing to obtain a focal power change of the second liquid crystal lens.

9. The glasses control method according to claim 6, characterized in that: The step S6: controlling the first liquid crystal lens to adjust to the target optical power also includes: S61: Acquire a correspondence between the focal length of the first liquid crystal lens and the driving voltage of the first liquid crystal lens as a first correspondence; S62: acquiring a driving voltage of the first liquid crystal lens corresponding to the target optical power as a target driving voltage according to the target optical power and the first corresponding relationship; S63: driving the first liquid crystal lens with a target driving voltage.

10. The glasses control method according to claim 6, characterized in that: The step S2: controlling the detection unit to focus on the target object, and obtaining the optical power of the second liquid crystal lens during focusing also includes: S21: Obtaining user eye movement data; S22: Determine the gaze point of the user's eyeball according to the user's eyeball movement data; S23: Acquire a scene image within the user's field of view; S24: determining a target object in the scene image according to the scene image within the user's field of view and the gaze point of the user's eyeball; S25: adjusting the focal length of the second liquid crystal lens so that the target object is imaged with a preset definition in the image acquisition module, and obtaining the focal length of the target object when imaged with the preset definition as the focal length of the second liquid crystal lens during focusing.

Images