CN204331144U - Zoom helmet - Google Patents

Abstract

The utility model discloses a kind of zoom helmet, belong to wearable field of display devices, the people of the visual impairment use that has which solving prior art existence has sense of discomfort, causes the problem of eye injury.Zoom helmet of the present utility model comprises picture frame, display screen and zoom lens; Display screen and zoom lens are fixed on picture frame indirectly or directly, and zoom lens are arranged on the side of the close human eye of display screen; Display screen is used for displays image information; The focus adjustable of zoom lens, and adopt suitable focal length by the light refraction from described display screen to the pupil of human eye, and be imaged on human eye retina.The utility model can be applicable to the colony of different eyesight, can also avoid causing glasses to injure.

Description

zoom headset

technical field

The utility model relates to the field of wearable display devices, in particular to a zoom head-mounted device.

Background technique

As a future technology, wearable smart devices are the focus of people's attention both in the fashion industry and in the consumer electronics market. With the development of science and technology, more and more smart watches, smart wristbands and smart glasses have begun to approach people's lives. Among them, head-mounted display devices are undoubtedly the pioneers in wearable smart devices. Typical examples of early head-mounted display devices are helmet display and glasses TV, but because the helmet display is too bulky, the glasses TV also has disadvantages such as bulkiness and opacity. With the further development of head-mounted display devices, miniaturized, multifunctional and transparent smart glasses have emerged.

The display devices of head-mounted devices on the market today usually include a display screen and a prism. The display screen is used to display images, and the prism is used to reflect light emitted from the display screen into the human eye, thereby forming an image on the retina of the human eye.

Most of the existing head-mounted devices are designed for people with normal vision, and their multi-functions are also based on the scope of use of normal people. For people with vision defects, such as myopia and hyperopia, when using these head-mounted devices, the image viewed by the user is blurred, and at the same time, it will bring discomfort to the user and cause damage to the eyes.

Utility model content

The technical problem mainly solved by the utility model is to provide a zoom head-mounted device, which can be applied to people with normal eyesight and people with vision defects, without causing discomfort and avoiding damage to the eyes.

In order to solve the above technical problems, a technical solution adopted by the utility model is to provide a zoom head-mounted device, which includes a mirror frame, a display screen and a zoom lens. Wherein, the display screen and the zoom lens are indirectly or directly fixed on the frame; the zoom lens is arranged on the side of the display screen close to the human eye; the display screen is used to display image information; the focal length of the zoom lens can be adjust, and use a suitable focal length to refract the light from the display screen to the pupil of the human eye, and image it on the retina of the human eye.

Preferably, the zoom lens is a liquid crystal lens, or a liquid lens.

Preferably, the zoom lens is a single lens or multiple lenses.

Preferably, the display screen is directly fixed on the frame; or, a lens is fixed on the frame; the display screen is a miniature display screen embedded in the lens.

Preferably, the zoom head-mounted device is smart glasses; the smart glasses are monocular smart glasses or binocular smart glasses.

Preferably, a zoom driving circuit is included for adjusting the focal length of the zoom lens to make the image imaged on the retina of the human eye clear when the display screen is turned on to display images.

The beneficial effect of the utility model is: different from the situation of the prior art, the zoom head-mounted device of the utility model is provided with a zoom lens with an adjustable focal length on the rear side of the display screen, and by adjusting the focal length of the zoom lens, the display screen displays The image is optically processed before it enters the eyes of the person who needs correction of vision, so that the eyes of the person who needs correction of vision can see the image clearly, does not need to wear additional glasses, and improves the comfort of the user and avoids damage to the eyes. .

Description of drawings

Fig. 1 is a schematic structural view of the first embodiment of the zoom head-mounted device of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the display screen and the zoom lens of the first embodiment of the zoom head-mounted device of the present invention;

Fig. 3 is a schematic diagram of the principle of imaging mode 1 of the first embodiment of the zoom head-mounted device of the present invention;

4 is a schematic diagram of the principle of imaging mode 2 of the first embodiment of the zoom head-mounted device of the present invention;

Fig. 5 is a schematic structural view of the second embodiment of the zoom head-mounted device of the present invention;

6 is a schematic diagram of the principle of imaging mode 1 of the second embodiment of the zoom head-mounted device of the present invention;

7 is a schematic diagram of the principle of imaging mode 2 of the second embodiment of the zoom head-mounted device of the present invention;

FIG. 8 is a schematic diagram of the principle of 3D display in the second embodiment of the zoom head-mounted device of the present invention.

Among them, 1. Mirror frame; 2. Display screen; 21. Miniature display screen; 22. Lens; 23. Image; 24. Left parallax image; 25. Right parallax image; 26. 3D image; 3. Zoom lens; 4. Miniature Camera earphone; 5. ear hook; 6. human eye; 61. pupil; 62. retina; 7. virtual image; 8. real image; 9. temple; 10. earphone; 11. distance sensor.

Detailed ways

The zoom head-mounted device of the present utility model can be commonly used equipment such as helmets, eye masks, smart glasses, non-smart glasses, etc. When it is smart glasses, it can be monocular smart glasses or binocular smart glasses.

Smart glasses refer to: like a smartphone, it has an independent operating system, and the user can install software, games and other programs provided by software service providers, and can complete adding schedules, map navigation, interacting with friends, and taking photos through voice or motion control It is a general term for such glasses that have functions such as video calls and video calls with friends, and can realize wireless network access through mobile communication networks.

Taking smart glasses as an example below, the utility model will be described in detail in conjunction with the accompanying drawings.

Please refer to Fig. 1, Fig. 2 and Fig. 3, Fig. 1 is a schematic structural view of the first embodiment of the zoom head-mounted device of the present invention; Fig. 2 is a display screen of the first embodiment of the zoom head-mounted device of the present invention and a schematic cross-sectional structure diagram of the zoom lens; FIG. 3 is a schematic schematic diagram of the principle of imaging mode 1 of the first embodiment of the zoom head-mounted device of the present invention.

In this embodiment, the zoom head-mounted device is monocular smart glasses, and the monocular smart glasses include a frame 1 , a display screen 2 and a zoom lens 3 .

The display screen 2 is used for displaying images. The focal length of the zoom lens 3 is adjustable, and the light emitted from the display screen 2 passes through the zoom lens 3. By adjusting the focal length of the zoom lens 3, the light emitted from the display screen 2 is refracted into the pupil 61 and imaged on the retina 62 to generate a picture.

The display screen 2 and the zoom lens 3 are fixed on the mirror frame 1, and the fixing method may be direct fixing or indirect fixing. For example, the edge of the display screen 2 is directly fixed on the mirror frame 1 . Alternatively, the lens 22 is fixed on the spectacle frame 1 , and the micro display screen 21 is used as the display screen 2 , and the micro display screen 21 is embedded in the lens 22 . In this embodiment, the second fixing method is adopted.

The display screen 2 can be a non-transparent display screen, a translucent display screen or a self-illuminating transparent display screen. The self-illuminating transparent display screen may be an active matrix organic light emitting diode panel (AMOLED) transparent display screen, or a transparent electroluminescence (TASEL) display screen, or other transparent display screens commonly used in the field.

The zoom lens 3 has an adjustable focal length, and adopts an appropriate focal length to refract the light from the display screen 2 to the pupil 61 of the human eye, and form an image on the retina 62 of the human eye. The zoom lens 3 can be a liquid crystal lens or a liquid lens, and it can be a single lens or a multi-lens. The focal length adjustment of the zoom lens is performed by changing the driving voltage. The liquid lens uses liquid as a lens, changes the focal length by changing the curvature of the liquid, and changes the shape of the droplet by applying an external voltage, thereby changing its focal length. The zoom lens 3 of this embodiment is a single-piece liquid lens, which is attached to the rear side of the display screen 2 , that is, the side close to the human eye 6 .

In addition, the zoom lens 3 can also be a lens group composed of multiple glass lenses with different focal lengths. By adjusting and selecting a lens or lens group with a focal length that matches the user's vision, the user can see clear images and improve the image quality. User comfort.

The monocular smart glasses also include a zoom drive circuit, which is used to adjust the focal length of the zoom lens 3 to make the image imaged on the retina 62 of the human eye clear when the display screen 2 is turned on to display images. The zoom driving circuit can be connected with an adjustment device, and the user can adjust the driving voltage by operating the adjustment device, thereby changing the focal length of the zoom lens.

The frame 1 of the smart glasses is provided with an earphone 10 , a miniature camera 4 , ear hooks 5 and temples 9 . In this embodiment, other functional modules except the display screen 2 are built in the temple 9, such as a microprocessor, a mobile communication module, WIFI, Bluetooth, and a power supply module. The miniature camera 4 can be used for taking pictures of external scenes, and then displays them through the display screen 2 .

Since the focal length of the zoom lens is adjustable, the zoom head-mounted device of the present invention can switch between two imaging modes, namely imaging mode 1 and imaging mode 2, by adjusting the focal length.

Please refer to Fig. 3 and Fig. 4, Fig. 3 is a principle schematic diagram of imaging mode 1 of the first embodiment of the zoom head-mounted device of the present invention; Fig. 4 is the imaging of the first embodiment of the zoom head-mounted device of the present invention Schematic diagram of the principle of mode 2.

When displaying an image on the display screen, the size k of the image displayed on the display screen meets the following conditions:

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; the\; ge</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; ,</span>$

Wherein, g is the distance between the display screen 2 and the zoom lens 3, d is the distance between the zoom lens 3 and the pupil 61 of the human eye, f is the focal length of the zoom lens 3, p is the size of the zoom lens 3, and e is the size of the pupil 61 of the human eye .

When the user has normal eyesight or myopia, adjust the focal length f of the zoom lens 3 so that the display screen 2 is located within one focal length of the zoom lens 3, that is, f>g; the following relationship is satisfied between the parameters:

$\frac{\mathrm{fg}}{f-g}+d>2f^{\&prime;},$ f' is the focal length of the human eyeball.

At this time, the displayed image of the display screen 2 becomes a magnified and upright virtual image 7 on the object side of the zoom lens 3 , and the human eyes see the magnified and upright virtual image 7 of the displayed image of the display screen 2 through the zoom lens 3 .

When the user has normal eyesight or is farsighted, adjust the focal length f of the zoom lens 3 so that the display screen 2 is located between one focal length and two focal lengths of the zoom lens 4, that is, 1/2g<f<g, and each parameter satisfies the following relation:

t is the distance between the pupil and the retina of the human eye.

At this time, the display image of the display screen 2 becomes a magnified inverted real image 8 on the image side of the zoom lens 4, and the real image 8 enters the pupil of the human eye and is imaged on the retina 62. zoom in on the image.

Specifically, adjust the focal length of the zoom lens 3 so that the display screen 2 is positioned within one focal length of the zoom lens 3, and the display screen 2 forms an enlarged and upright virtual image 7 on the object side of the zoom lens 3, and the human eye 6 sees it through the zoom lens 3. Go to the display screen 2 to enlarge the upright virtual image 7.

For example, the pitch k=10mm of the display screen 2, the size p=20mm of the zoom lens 3, the distance g=5mm between the display screen 2 and the zoom lens 3, the distance d=8mm between the zoom lens 3 and the pupil 61, usually the size of the pupil 61 It is e=4mm, the focal length of the human eyeball f'=17.05mm, and the distance between the pupil 61 and the retina 62 is t=24mm.

Adjust the focal length f=5.102mm of zoom lens 3, then each parameter satisfies the relation: f>g,

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; the\; ge</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; ,</span>\frac{\mathrm{<span\; class="notranslate">\; fg</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; .</span>$

At this time, what the human eye sees through the zoom lens 3 is the magnified upright virtual image 7 on the display screen 2, as shown in FIG. 3 , this imaging mode is suitable for people with normal eyesight or myopia.

Of course, the focal length of the zoom lens 3 can also be adjusted so that the display screen 2 is positioned between one focal length and twice the focal length of the zoom lens 3, and the display screen 2 becomes an enlarged inverted real image 8 on the image side of the zoom lens 3, and the real image 8 enters 61 The post-pupillary image is formed on the retina 62, and its effect is equivalent to that the human eye 6 directly observes an upright and enlarged image in the object space.

For example, adjust the focal length f=4.5mm of zoom lens 3, then each parameter satisfies the relation: 1/2g<f<g,

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; the\; ge</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; ,</span>\frac{\mathrm{<span\; class="notranslate">\; gf</span>}}{\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; .</span>$

At this time, what the human eye sees through the zoom lens 3 is like a magnified and upright real object 8 in the object space, as shown in FIG. 4 , this imaging mode is suitable for people with normal vision or hyperopia.

Different from the situation in the prior art, the zoom head-mounted device of the present invention is equipped with a zoom lens with adjustable focal length on the rear side of the display screen. By adjusting the focal length of the zoom lens, the imaging mode of the zoom head-mounted device is changed. One imaging mode is: adjust the focal length so that the image displayed on the display screen is within one focal length of the zoom lens, and the image displayed on the display screen forms a magnified upright virtual image on the object side of the zoom lens, and the human eye will see it through the zoom lens The displayed image of the display screen enlarges the upright virtual image, so that people with myopia and normal eyesight can see the image clearly. Another imaging mode is: adjust the focal length so that the image displayed on the display screen is between one focal length and twice the focal length of the zoom lens, and the displayed image on the display screen becomes a magnified inverted real image on the image side of the zoom lens, and the real image After entering the pupil of the human eye, it is imaged on the retina, and its effect is equivalent to that the human eye directly observes an upright and enlarged image in the object space, so that people with hyperopia and normal vision can see the image clearly. The zoom head-mounted device is applicable to groups with different eyesight, does not require the user to wear additional glasses, improves the comfort of the user, and avoids damage to the eyes.

Please refer to FIG. 5 . FIG. 5 is a schematic structural diagram of a second embodiment of the zoom head-mounted device of the present invention.

In this embodiment, the zoom head-mounted device is binocular smart glasses, and the binocular smart glasses include a frame 1 , a display screen 2 and a zoom lens 3 .

The display screen 2 is used to display an image 23 , and the edge of the display screen 2 is directly fixed on the mirror frame 1 .

The focal length of the zoom lens 3 is adjustable. The light emitted from the display screen 2 passes through the zoom lens. By adjusting the focal length of the zoom lens 3, the light emitted from the display screen 2 is refracted into the pupil 61 and formed on the retina 62 to generate a picture.

The zoom lens 3 of this embodiment is a rectangular liquid crystal lens, and the focal length of the zoom lens 3 is adjusted by adjusting the driving voltage. The zoom lens 3 is provided with two pieces, and each piece corresponds to a human eye. The zoom lens 3 is attached to the rear side of the display screen 2 , that is, the side close to the human eye 6 .

In addition to the display screen 2, other functional modules of the binocular smart glasses of this embodiment are built in the frame 1 and the temples 9, such as a microprocessor, a mobile communication module, WIFI, Bluetooth, and a power supply module. The display screen 2 is also inlaid with a miniature camera 4 and a distance sensor 11. The distance sensor 11 can be used to measure the distance between the person and the object photographed by the miniature camera 4, and prompt the distance by voice.

Please refer to Figure 6 and Figure 7, Figure 6 is a schematic diagram of the principle of imaging mode 1 of the second embodiment of the zoom head-mounted device of the present invention; Figure 7 is the imaging of the second embodiment of the zoom head-mounted device of the present invention Schematic diagram of the principle of mode 2.

Adjust the focal length of the zoom lens 3 so that the image 23 displayed on the display screen 2 is located within one focal length of the zoom lens 3, and the image 23 displayed on the display screen 2 becomes an enlarged and upright virtual image 7 on the object side of the zoom lens 3, and the human eye 6 The enlarged and upright virtual image 7 of the image 23 displayed on the display screen 2 is viewed through the zoom lens 3 .

For example, the distance d=12mm between zoom lens 3 and pupil 61 is the conventional distance between glasses and human eyes 6. The image 23 area size displayed on display screen 2 is k=7.322mm, and the size of zoom lens 3 is p=15mm. 2 and the zoom lens 3 distance g=5mm, usually the size of the pupil 61 is e=4mm, the focal length of the human eyeball f'=17.05mm, the distance t=24mm between the pupil 61 and the retina 62.

Adjust the focal length f=5.15mm of zoom lens 3, then each parameter satisfies the relation: f>g,

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; the\; ge</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; ,</span>\frac{\mathrm{<span\; class="notranslate">\; fg</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; .</span>$

At this time, what the human eye sees through the zoom lens 3 is the magnified upright virtual image 7 on the display screen 2, as shown in FIG. 6 , this imaging mode is suitable for people with normal vision or myopia.

Of course, the focal length of the zoom lens 3 can also be adjusted so that the display screen 2 is positioned between one focal length and twice the focal length of the zoom lens 3, and the display screen 2 becomes an enlarged inverted real image 8 on the image side of the zoom lens 3, and the real image 8 enters The pupil 61 is then imaged on the retina 62 , and its effect is equivalent to that of the human eye directly viewing an upright and enlarged image in the object space.

For example, adjust the focal length f=4.8mm of zoom lens 3, then each parameter satisfies the relation: 1/2g<f<g,

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&le;</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; the\; ge</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; ,</span>\frac{\mathrm{<span\; class="notranslate">\; gf</span>}}{\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; .</span>$

At this time, what the human eye sees through the zoom lens 3 is like a magnified and upright real object 8 in the object space, as shown in FIG. 7 , this imaging mode is suitable for people with normal vision or hyperopia.

Please refer to FIG. 8 . FIG. 8 is a schematic diagram of the principle of 3D display in the second embodiment of the zoom head-mounted device of the present invention. The left disparity image 24 is displayed in the left image display area of the display screen, and the right disparity image 25 is displayed in the right image display area, and a 3D image 26 is generated through fusion of the user's brain.

The beneficial effects of the utility model are: a zoom lens with adjustable focal length is arranged on the rear side of the display screen, and by adjusting the focal length of the zoom lens, the image displayed on the display screen can be optically processed before entering the eyes of people who need to correct their vision, thereby The human eyes that need to correct their eyesight can see the image clearly without additional glasses, the user's comfort is improved, and the damage to the eyes can be avoided.

The above is only the embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process transformation made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (7)

1. A zoom head-mounted device, comprising: Frames, displays and zoom lenses; Wherein, the display screen and the zoom lens are indirectly or directly fixed on the frame; the zoom lens is arranged on the side of the display screen close to the human eye; The display screen is used to display image information; The focal length of the zoom lens is adjustable, and adopts a suitable focal length to refract the light from the display screen to the pupil of the human eye and form an image on the retina of the human eye. 2. The zoom head-mounted device according to claim 1, wherein the zoom lens is a liquid crystal lens or a liquid lens. 3. The zoom head-mounted device according to claim 1, wherein the zoom lens is a single-lens lens or a multi-lens lens. 4. The zoom head-mounted device according to claim 1, wherein the display screen is directly fixed on the frame; or, A lens is fixed on the frame; the display screen is a miniature display screen embedded in the lens. 5. The zoom head-mounted device according to claim 1, wherein the zoom head-mounted device is smart glasses. 6. The zoom head-mounted device according to claim 5, wherein the smart glasses are monocular smart glasses or binocular smart glasses. 7. The zoom head-mounted device according to any one of claims 1 to 6, characterized in that it comprises a zoom drive circuit for adjusting the focal length of the zoom lens so that when the display screen is turned on to display an image The image formed on the retina of the human eye is clear.