Near-eye display device and terminal

Abstract

The application discloses a near-eye display device and a terminal, and belongs to the field of projection display. The near-eye display device comprises a micro display, a lens group and a light waveguide device. The micro display in the near-eye display device can directly emit an image light beam, and transmit the image light beam to the light waveguide device for imaging after adjustment of the lens group, without cooperation of a light source assembly, a relay lens group and a light processing chip to emit the image light beam to the light waveguide device. In this way, the volume of the near-eye display device can be effectively reduced, and thus the volume of the terminal integrated with the near-eye display device is relatively small.

Description

Technical Field

[0001] This application relates to the field of projection display, and in particular to a near-eye display device and terminal. Background Technology

[0002] Currently, with the development of Augmented Reality (AR) technology, the forms and types of terminals capable of performing AR are increasing, and their application areas are becoming more and more widespread. These terminals typically include a near-eye display device and a controller, with the controller used to control the light emission of the near-eye display device.

[0003] Near-eye display devices typically include a light source assembly, a relay lens group, a light processing chip, a projection lens, and an optical waveguide device. The light beam emitted from the light source assembly is guided by the relay lens group, which then directs the beam to the light processing chip. The light processing chip modulates the beam into an image beam, which is then projected through the projection lens and emitted into the optical waveguide device. The image beam is then transmitted through the optical waveguide device to the human eye, allowing the eye to see a virtual image. The light processing chip is typically a Liquid Crystal on Silicon (LCOS) chip or a Digital Light Processing (DLP) chip, etc.

[0004] However, existing near-eye display devices typically require the cooperation of a light source assembly, a relay lens assembly, and a light processing chip to emit an image beam into the optical waveguide device, resulting in a large size of the near-eye display device, which in turn leads to a large size of the terminal. Summary of the Invention

[0005] This application provides a near-eye display device and terminal. It solves the problem of the large size of existing near-eye display devices. The technical solution is as follows:

[0006] On one hand, a near-eye display device is provided, the near-eye display device comprising:

[0007] Microdisplays, lens assemblies, and optical waveguide devices;

[0008] The microdisplay is used to emit an image beam;

[0009] The lens group is located on the light-emitting side of the microdisplay, and the lens group is used to adjust the image beam emitted by the microdisplay. The lens group includes: a cemented doublet lens;

[0010] The optical waveguide device has an incident light area and an exit light area. The incident light area of ​​the optical waveguide device is located on the exit light side of the lens group. The optical waveguide device is configured to transmit the adjusted image beam incident in the incident light area to the exit light area.

[0011] On the other hand, a terminal is provided, the terminal comprising:

[0012] A near-eye display device and a controller, wherein the controller is connected to the near-eye display device, and the near-eye display device is any of the near-eye display devices given above;

[0013] The controller is configured to control the near-eye display device to emit an image beam.

[0014] The beneficial effects of the technical solutions provided in this application include at least the following:

[0015] A near-eye display device includes a microdisplay, a lens assembly, and an optical waveguide device. The microdisplay in this near-eye display device can directly emit an image beam, which is then transmitted to the optical waveguide device for imaging after adjustment by the lens assembly. This eliminates the need for a light source assembly, a relay lens assembly, and an optical processing chip to emit the image beam to the optical waveguide device. This effectively reduces the size of the near-eye display device, resulting in a smaller terminal integrating it. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a near-eye display device provided in an embodiment of this application;

[0018] Figure 2 This is a partial structural schematic diagram of a near-eye display device provided in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the modulation transfer function curve of an optical system provided in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the field curvature of an optical system provided in an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the distortion curve of an optical system provided in the embodiment.

[0022] Figure 6 This is a schematic diagram of the chromatic difference curve of an optical system provided in an embodiment of this application.

[0023] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0025] Augmented reality (AR) technology is a new technology that integrates real-world and virtual-world information. It applies virtual information to the real world, overlaying real environments and virtual objects in the same scene or space in real time, allowing them to be perceived by human senses and thus achieving a sensory experience that transcends reality.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a near-eye display device provided in an embodiment of this application. The near-eye display device 000 may include: a microdisplay 100, a lens group 200, and an optical waveguide device 300.

[0027] The microdisplay 100 in the near-eye display device 000 can be used to emit a patterned beam.

[0028] The lens group 200 in the near-eye display device 000 can be located on the light-emitting side of the microdisplay 100, and the lens group 200 can be used to adjust the image beam emitted from the microdisplay 100. The lens group 200 may include: a cemented doublet lens 201.

[0029] The optical waveguide device 300 in the near-eye display device 000 may have an incident light region 300a and an exit light region 300b, wherein the incident light region 300a may be located on the exit light side of the lens group 200. The optical waveguide device 300 may be configured to transmit an image beam, adjusted by the lens group 200 and incident through the incident light region 300a of the optical waveguide device 300, to the exit light region 300b of the optical waveguide device 300.

[0030] For example, the microdisplay 100 in the near-eye display device 000 can emit an image beam. This image beam is first adjusted by a lens group 200 located on the light-emitting side of the microdisplay 100 before being emitted. The image beam then enters the light-receiving area 300a of the optical waveguide device 300. Next, the image beam is transmitted within the optical waveguide device 300 to the light-emitting area 300b of the optical waveguide device 300. Finally, the image beam is emitted through the light-emitting area 300b of the optical waveguide device 300. In this configuration, since both cemented doublet lenses have high chromatic aberration correction capabilities, and when cemented doublet lenses are used in conjunction with other lenses, the lens group can simultaneously possess high chromatic aberration and aberration correction capabilities. This significantly reduces the number of conventional lenses and lens combinations used, resulting in a lens group with high resolution while correspondingly reducing the overall number of lenses, effectively shortening the length of the near-eye display device integrating the lens group.

[0031] For example, the optical waveguide device 300 may include an optical waveguide sheet 301, a coupling grating 302, and a coupling grating 303, with the coupling grating 302 and the coupling grating 303 respectively disposed at both ends of the optical waveguide sheet 301. The coupling grating 302 may be disposed in the light-incident region 300a of the optical waveguide sheet 301 in the optical waveguide device 300, and the coupling grating 303 may be disposed in the light-outceasing region 300b of the optical waveguide sheet 301. The coupling grating 302 is used to couple the image beam emitted from the lens group 200 into the optical waveguide sheet 301, and the coupling grating 303 is used to receive the image beam emitted from the coupling grating 302 and couple the image beam out of the optical waveguide sheet 301 to enter the human eye for imaging.

[0032] In this application, the microdisplay 100 in the near-eye display device 000 can directly emit an image beam, and after the image beam is adjusted by the lens group 200, it is transmitted to the optical waveguide device 300 for imaging, without the need for the cooperation of a light source assembly, a relay lens group, and an optical processing chip to emit the image beam to the optical waveguide device 300. This effectively reduces the size of the near-eye display device 000, thereby making the terminal integrating the near-eye display device 000 smaller.

[0033] In summary, this application provides a near-eye display device, including a microdisplay, a lens group, and an optical waveguide device. The microdisplay in this near-eye display device can directly emit an image beam, which is then transmitted to the optical waveguide device for imaging after adjustment by the lens group. This eliminates the need for a light source assembly, a relay lens group, and a light processing chip to emit the image beam to the optical waveguide device. This effectively reduces the size of the near-eye display device, resulting in a smaller terminal integrating it.

[0034] Optional, please refer to Figure 2 , Figure 2 This is a partial structural schematic diagram of a near-eye display device provided in an embodiment of this application. The cemented doublet lens 201 in the lens group 200 may include a first sub-lens 2011 and a second sub-lens 2012 arranged sequentially along a direction away from the microdisplay 100 in the near-eye display device 000. The first sub-lens 2011 may have negative optical power, and the second sub-lens 2012 may have positive optical power. In this application, the first sub-lens 2011 with negative optical power can diverge the image beam, while the second sub-lens 2012 with positive optical power can converge the light. In this case, in order for the cemented doublet lens 201 to correct the chromatic aberration of the lens group 200, the first sub-lens 2011 and the second sub-lens 2012 in the cemented doublet lens 201 should be made of materials with a large difference in Abbe number (also known as dispersion coefficient). For example, the Abbe number of the first sub-lens 2011 may be 28.0, and the Abbe number of the second sub-lens 2012 may be 64.0.

[0035] In this embodiment, both the first sub-lens 2011 and the second sub-lens 2012 in the cemented doublet lens 201 can be spherical lenses. In this application, the first sub-lens 2011 may have an incident surface S1 and a first cemented surface, the first cemented surface being the exit surface S2 of the first sub-lens 2011. Both the incident surface S1 and the first cemented surface of the first sub-lens 2011 can be spherical. The second sub-lens 2012 has a second cemented surface and an exit surface S3, the second cemented surface being the incident surface S4 of the second sub-lens 2012. Both the second cemented surface and the exit surface of the second sub-lens 2012 can be spherical. The first cemented surface of the first sub-lens 2011 and the second cemented surface of the second sub-lens 2012 are cemented together to form the cemented doublet lens 201.

[0036] Optional, such as Figure 2 As shown, the lens group 200 in the near-eye display device 000 may further include a first lens 202 and a second lens 203, both of which can be located between the microdisplay 100 and the cemented doublet lens 201. The first lens 202 may have positive optical power, and the second lens 203 may have negative optical power. The first lens 202, the second lens 203, and the cemented doublet lens 201 in the lens group 200 may be arranged sequentially in a direction away from the microdisplay 100, and they may share a common optical axis L. In this case, the image beam emitted from the microdisplay 100 can be converged by the first lens 202 with positive optical power, and the image beam emitted from the first lens 202 can be diverged by the second lens 203 with negative optical power.

[0037] In the embodiments of this application, such as Figure 2 As shown, both the first lens 202 and the second lens 203 in the lens group 200 can be aspherical lenses. In this application, the first lens 202 in the lens group 200 can have an incident surface S5 and an exit surface S6, both of which are aspherical. The second lens 203 in the lens group 200 can have an incident surface S7 and an exit surface S8, both of which are aspherical. In this case, by using the aspherical first lens 202 and the aspherical second lens 203, aberrations (e.g., field curvature, distortion, and spherical aberration) within the optical system of the near-eye display device can be corrected, thereby improving the imaging quality of the near-eye display device 000.

[0038] It should be noted that aspherical lenses are characterized by a continuously changing curvature from the lens center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses possess superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0039] Optionally, since symmetrical aspherical lenses have regular shapes and are easy to manufacture, especially rotationally symmetrical aspherical lenses, they are even easier to manufacture. Therefore, when the aspherical lenses in the projection lens, such as the first aspherical lens, the second aspherical lens, and the third aspherical lens, all adopt rotationally symmetrical structures, the manufacturing method of the aspherical lenses can be simplified, thereby simplifying the manufacturing of the projection lens and reducing production costs.

[0040] It should be noted that the lenses in the lens group 200 are typically made of glass. However, glass is expensive, and aspherical lenses made of glass are difficult to process. Therefore, the first and second lenses can be made of plastic, such as 480R. Plastic is cheaper, and aspherical lenses made of plastic are easier to process. It should also be noted that the first and second lenses can also be made of glass; this embodiment does not specifically limit this.

[0041] In this embodiment, the distance on the optical axis L between the side of the second sub-lens 2012 in the cemented doublet lens 201 facing away from the first sub-lens 2011 and the light-emitting surface of the microdisplay 100 can be less than 12.5 mm. That is, the horizontal distance between the intersection of the light-emitting surface of the second sub-lens 2012 and the optical axis L and the light-emitting surface of the microdisplay 100 can be less than 12.5 mm. This further reduces the size of the near-eye display device 000, and when the near-eye display device 000 is integrated into a terminal, the size of the terminal is also reduced.

[0042] Optionally, the effective focal length of the lens group 200 in the near-eye display device 000 can range from 9 mm to 10 mm. For example, the effective focal length of the lens group 200 can be 9.56 mm.

[0043] In this embodiment, both the first lens 202 and the second sub-lens 2012 in the lens group 200 can be biconvex lenses, and both the second lens 203 and the first sub-lens 2011 can be biconcave lenses. In this application, the light-incident surface S5 of the first lens 202 can be convex, and the light-exiting surface S6 of the first lens 202 can also be convex; the light-incident surface S4 of the second sub-lens 2012 can be convex, and the light-exiting surface S3 of the second sub-lens 2012 can also be convex. The light-incident surface S7 of the second lens 203 can be concave, and the light-exiting surface S8 of the second lens 203 can also be concave; the light-incident surface S1 of the first sub-lens 2011 can be concave, and the light-exiting surface S2 of the first sub-lens 2011 can also be concave.

[0044] In this scenario, when a smaller microdisplay 100 is used, the image beam emitted from the microdisplay 100 first passes through a biconvex first lens 202 for focusing, and then passes through a biconcave second lens 203 for divergence. This eliminates the need for a large curvature in the biconcave first sub-lens 2011 when it diverges in the rear field. This reduces the manufacturing difficulty of the biconcave first sub-lens 2011. In related technologies, the light beam emitted from the light processing chip is focused twice by two adjacent biconvex lenses before being diverged by a biconcave lens in the rear field. In this case, to ensure the exit pupil diameter, the biconcave lens needs a large curvature, leading to greater manufacturing difficulty.

[0045] Optionally, the microdisplay 100 in the near-eye display device 000 may include: a micro organic light-emitting diode (Micro OLED), a micro light-emitting diode (Micro LED), or a micro liquid crystal display (LCD). Under operating power conditions, the brightness of a Micro-OLED is less than 5000 nits, and the brightness of an LCD is less than 15000 nits. When the microdisplay in this embodiment is a Micro-LED display, it can be, for example, a green Micro-LED, or other monochrome or color Micro-LEDs. Compared to Micro-OLED and LCD, the brightness of Micro-LED can reach 2,000,000 to 3,000,000 nits, far exceeding that of Micro-OLED and LCD. Furthermore, since Micro-LED is a self-emissive light source, projection systems using Micro-LED have better contrast and lower display latency.

[0046] It should be noted that nits is a unit of measurement for brightness. Brightness is the human perception of the intensity of light and can be used to indicate the brightness of an image.

[0047] In this embodiment, to facilitate the miniaturization of the near-eye display device 000, the microdisplay 100 adopts a small-sized model. For example, the diagonal dimension of the effective light-emitting area of ​​the microdisplay 100 can be 0.22 inches, and the aspect ratio of the effective light-emitting area is 4:3. A glass cover is disposed outside the effective light-emitting surface of the microdisplay 100. The glass cover can exist independently or be integrated into the microdisplay 100. This glass cover protects the light-emitting surface of the microdisplay, and the thickness of the glass cover can be 0.3 mm.

[0048] Table 1 shows the radius of curvature R, thickness T, refractive index Nd, and Abbe number Vd of each lens in the lens group of this application embodiment. The units for radius of curvature R and thickness T are millimeters (mm).

[0049] Table 1

[0050] Second Sub-lens 5.109 2.281 1.81 64.0 First Sub-lens -15 0.800 1.55 28.0 10.609 0.800 Second lens -5.795 0.800 1.54 45.0 4.789 0.690 First lens 9.497 2.349 1.80 54.0 -8.962 4.259

[0051] First, it should be noted that the radius of curvature of the spherical lens surface in the lens group 200 refers to the radius of the sphere of the lens surface, while the radius of curvature of the aspherical lens refers to the radius at the vertex of the lens surface. To more clearly illustrate the curvature direction of the lens surface, assuming the direction from the image plane to the object plane is defined as positive, then when the direction from the surface of a lens in the lens group to its center is the same as the direction from the image plane to the object plane, the radius of curvature of that lens is positive; when the direction from the surface of a lens in the optical system to its center is opposite to the direction from the image plane to the object plane, the radius of curvature of that lens is negative. It should also be noted that in this application, the side where the microdisplay is located is the object plane, and the side away from the microdisplay along the image beam transmission direction is the image plane.

[0052] The center distance between two adjacent lenses refers to the horizontal distance between the endpoints of the two adjacent surfaces of the two lenses along the optical axis.

[0053] As shown in Table 1, the radius of curvature of the light-emitting surface S3 of the second sub-lens 2012 is 5.109 mm, and the radius of curvature of the light-incident surface S4 of the second sub-lens 2012 is -15 mm; the radius of curvature of the light-emitting surface S2 of the first sub-lens 2011 is -15 mm, and the radius of curvature of the light-incident surface S1 of the first sub-lens 2011 is 10.609 mm; the radius of curvature of the light-emitting surface S8 of the second lens 203 is -5.795 mm, and the radius of curvature of the light-incident surface S7 of the second lens 203 is 4.789 mm; the radius of curvature of the light-emitting surface S6 of the first lens 202 is 9.497 mm, and the radius of curvature of the light-incident surface S5 of the first lens 202 is -8.962 mm.

[0054] The center thickness of the second sub-lens 2012 is 2.281 mm, the center thickness of the first sub-lens 2011 is 0.800 mm, and the center distance between the first sub-lens 2011 and the second lens 203 is 0.800 mm. The center thickness of the second lens 203 is 0.800 mm, and the center distance between the second lens 203 and the first lens 202 is 0.690 mm. The center thickness of the first lens 202 is 2.349 mm, and the center distance between the first lens 202 and the glass cover plate on the surface of the microdisplay 100 is 4.259 mm.

[0055] The refractive index of the second sub-lens 2012 is 1.81, and the Abbe number of the second sub-lens 2012 is 64.0; the refractive index of the first sub-lens 2011 is 1.55, and the Abbe number of the first sub-lens 2011 is 28.0; the refractive index of the second lens 203 is 1.54, and the Abbe number of the second lens 203 is 45.0; the refractive index of the first lens 202 is 1.80, and the Abbe number of the first lens 202 is 54.0.

[0056] In this application, the focal length of the first lens 202 in the lens group 200 is 6.106 mm, the focal length of the second lens 203 is -4.730 mm, the focal length of the first sub-lens 2011 is -29.830 mm, and the focal length of the second sub-lens 2012 is 5.794 mm. The aperture value of the first lens 202 is 4.02 mm, the aperture value of the second lens 203 is 3.62 mm, the aperture value of the first sub-lens 2011 is 4.2 mm, and the aperture value of the second sub-lens 2012 is 4.65 mm.

[0057] Optionally, the exit pupil diameter of the near-eye display device 000 provided in this embodiment can be 4 mm, since the entrance pupil diameter of the optical waveguide device 300 is the same as the exit pupil diameter of the near-eye display device 000. Therefore, the entrance pupil diameter of the optical waveguide device 300 can also be 4 mm. Furthermore, the field of view (FOV) formed by the near-eye display device provided in this embodiment can be 30 degrees.

[0058] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the modulation transfer function (MTF) curve of an optical system provided in an embodiment of this application. The horizontal axis represents the number of line pairs per millimeter in space, and the vertical axis represents the modulation transfer function. The modulation transfer function curve (MTF) refers to the relationship between modulation density and the number of line pairs per millimeter in an image, and is used to evaluate the ability of optical elements to reproduce details of a scene.

[0059] from Figure 3 It can be seen that the optical transfer function (MTF) of lens group 200 at a spatial frequency of 125 line pairs (Ip) / mm is greater than 0.29, which indicates that lens group 200 has good resolution and image resolution capability.

[0060] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the field curvature of an optical system provided in an embodiment of this application. The horizontal axis represents the change in field curvature of the optical system, in millimeters, and the vertical axis represents the half-field-of-view angle of the optical system, in degrees. Figure 4 As can be seen, the field curvature value fluctuates within the range of -0.03 to 0.03, indicating that the curvature and warp of the imaging surface of the optical system are relatively small, and the field curvature is well corrected.

[0061] Please refer to Figure 5 , Figure 5This is a schematic diagram of the distortion curve of an optical system provided in the embodiment. The horizontal axis represents the percentage of distortion of the optical system, and the vertical axis represents the half-field-of-view angle value of the optical system, in degrees. Figure 5 As can be seen, the maximum optical distortion is less than 1.5%, indicating that the distortion of the image image from the optical system is relatively small.

[0062] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the chromatic aberration curve of an optical system provided in an embodiment of this application. The horizontal axis represents the numerical change in chromatic aberration of the optical system, in micrometers (μm), and the vertical axis represents the half-field-of-view angle of the optical system, in degrees. Figure 6 As can be seen, the chromatic aberration of the optical system is controlled within 5 micrometers, indicating that the use of cemented doublet lenses in this optical system can significantly eliminate chromatic aberration, resulting in good image quality.

[0063] In summary, this application provides a near-eye display device, including a microdisplay, a lens group, and an optical waveguide device. The microdisplay in this near-eye display device can directly emit an image beam, which is then transmitted to the optical waveguide device for imaging after adjustment by the lens group. This eliminates the need for a light source assembly, a relay lens group, and a light processing chip to emit the image beam to the optical waveguide device. This effectively reduces the size of the near-eye display device, resulting in a smaller terminal integrating it.

[0064] This application embodiment also provides a terminal, which can be a head-mounted device or AR glasses. The terminal may include a near-eye display device 000 and a controller (not shown in the figure). The controller can be connected to the near-eye display device 000 and can be configured to control the near-eye display device 000 to emit an image beam, so that the image beam can be transmitted within the optical waveguide device 300 in the near-eye display device to form an image after entering the human eye. The near-eye display device 000 can be any of the near-eye display devices given above.

[0065] Optionally, the terminal may further include at least one network interface, a memory, and at least one bus, the bus being used to establish communication between the controller, the network interface, the memory, and the near-eye display device; the memory and the network interface are respectively connected to the controller via the bus. The controller may also execute executable modules stored in the memory, such as computer programs. The memory may include high-speed random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage device. Communication between the terminal and at least one other device is established through at least one network interface (wired or wireless). In some embodiments, the memory stores a program that can be executed by the controller to control the near-eye display device to emit light carrying virtual image information and to adjust the virtual image information.

[0066] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0067] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A near-eye display device, characterized in that, include: Microdisplays, lens assemblies, and optical waveguide devices; The microdisplay is used to emit an image beam; The lens group is located on the light-emitting side of the microdisplay. The lens group is used to adjust the image beam emitted by the microdisplay. The lens group includes: a first lens with positive optical power and a second lens with negative optical power arranged sequentially in a direction away from the microdisplay, and a cemented doublet lens, wherein the first lens, the second lens, and the cemented doublet lens are coaxial; the cemented doublet lens includes: a first sub-lens with negative optical power and a second sub-lens with positive optical power arranged sequentially in a direction away from the microdisplay, wherein the Abbe number of the second sub-lens is greater than the Abbe number of the first sub-lens; The optical waveguide device has an incident light area and an exit light area. The incident light area of ​​the optical waveguide device is located on the exit light side of the lens group. The optical waveguide device is configured to transmit the adjusted image beam incident in the incident light area to the exit light area.

2. The near-eye display device according to claim 1, characterized in that, Both the first sub-lens and the second sub-lens are spherical lenses.

3. The near-eye display device according to claim 1, characterized in that, Both the first lens and the second lens are aspherical lenses.

4. The near-eye display device according to claim 1, characterized in that, The distance on the optical axis between the side of the second sub-lens facing away from the first sub-lens and the light-emitting surface of the microdisplay is less than 12.5 mm.

5. The near-eye display device according to claim 1, characterized in that, The effective focal length of the lens group ranges from 9 mm to 10 mm.

6. The near-eye display device according to claim 1, characterized in that, Both the first lens and the second sub-lens are biconvex lenses, and both the second lens and the first sub-lens are biconcave lenses.

7. The near-eye display device according to any one of claims 1-6, characterized in that, The microdisplay includes micro organic light-emitting diodes (Micro OLED), micro light-emitting diodes (Micro LED), or micro liquid crystal displays (LCD).

8. A terminal, characterized in that, include: A near-eye display device and a controller, wherein the controller is connected to the near-eye display device, and the near-eye display device is the near-eye display device according to any one of claims 1 to 7 above; The controller is configured to control the near-eye display device to emit an image beam.

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