Near eye display device and manufacture method of same

Abstract

This application provides a near-eye display device, including a display screen and a light guiding module. The display screen is used to emit image light. The light guiding module is used to receive the image light and project the image light onto a human eye, so that the image light located at the eye socket is received by the human eye. The display screen is positioned at an imaging surface where multiple beams of light with different field of view angles projected from the eye socket onto the light guiding module are focused. This application also provides a method for manufacturing the near-eye display device.

Description

Technical Field

[0001] This application relates to the field of near-eye display devices, and more particularly to a near-eye display device and a method for manufacturing a near-eye display device. Prior Technology

[0002] With the development of technology, Virtual Reality (VR) technology is being applied to various fields, such as gaming, education, healthcare, and retail. Common optical design solutions for VR display devices currently on the market include aspherical lens designs, Fresnel lens designs, and pancake optical path designs.

[0003] Compared to aspherical lens designs and Fresnel lens designs, the Pancake design can significantly reduce the size of VR display devices. As users demand higher image quality and wider field of view for VR displays, the Pancake design also needs to evolve towards higher image quality and a wider field of view. However, in the Pancake design, increasing the field of view requires increasing the size of the optical lens group, the display screen size, or the curvature of the optical lens; conversely, improving image quality requires reducing the curvature of the optical lens. Therefore, there is a technical contradiction between the need to increase the field of view and the need to improve image quality, making it difficult to optimize the Pancake design while simultaneously satisfying both requirements. Summary of the Invention

[0004] The first aspect of this application provides a near-eye display device, comprising: Display screen, the display screen being used to emit image light; and A light guiding module is used to receive the image light and project the image light onto the human eye, so that the image light located at the position of the eye box is received by the human eye; The display screen is positioned at the location where multiple beams of light with different field of view angles are focused from the position of the eye box onto the imaging surface of the light guiding module.

[0005] The near-eye display device provided in this application embodiment, by setting a display screen, is positioned at the imaging surface where multiple beams of light with different field of view angles projected from the eye box onto the light guiding module are focused. Since light is reversible, image light emitted from the display screen can also enter the eye box after passing through the light guiding module, thereby increasing the proportion of light received by the human eye, increasing the field of view angle of the near-eye display device, and thus enhancing the user's sense of immersion in the image. In addition, since the position of the display screen coincides with the position of the imaging surface, it can more effectively ensure that the light emitted from each area of ​​the display surface can be clearly converged to the eye box for imaging, thereby improving image distortion caused by aberrations, chromatic aberrations, or distortions, and thus improving the imaging quality of the near-eye display device.

[0006] In one embodiment, the display screen includes a display surface for emitting the image light, the shape of the display surface being the same as the shape of the imaging surface.

[0007] In one embodiment, the size of the display surface is the same as the size of the imaging surface.

[0008] In one embodiment, the display screen is a curved screen, and the display screen includes a cover plate, the display surface of which is curved.

[0009] In one embodiment, the light guiding module includes a first lens, a semi-reflective film, a second lens, a composite film layer, and a third lens. The first lens is used to receive the image light emitted from the display screen. The semi-reflective film is disposed on the side of the first lens close to the second lens. The composite film layer is disposed between the second lens and the third lens. The composite film layer is used to receive and change the polarization state of the image light so that the image light is transmitted through the third lens.

[0010] In one embodiment, the composite film layer includes a phase retardation layer and a reflective polarization layer, wherein the phase retardation layer is disposed on the side of the second lens away from the first lens, and the reflective polarization layer is disposed on the side of the third lens close to the second lens.

[0011] A second aspect of this application provides a method for manufacturing a near-eye display device, used to manufacture a near-eye display device as described in any of the above embodiments, comprising: Obtain the parameters of the near-eye display device, including the dimensions of the eye box and the geometric and optical performance parameters of the light guiding module; A backlight path model is established based on the parameters. The backlight path model includes multiple beams of light with different field of view angles projected from the position of the eye box, and a light guiding module for receiving and guiding the light beams. The imaging plane is calculated based on the complex image-side focal coordinates formed by focusing multiple beams of light with different field of view after passing through the light guiding module; The display screen is manufactured according to the imaging surface, such that the shape of the display surface of the display screen is the same as the shape of the imaging surface.

[0012] The near-eye display device manufacturing method provided in this application embodiment is used to manufacture a near-eye display device as described in any of the above embodiments. It establishes a backlight path model by acquiring the parameters of the near-eye display device, calculates the imaging surface based on the complex image-side focal coordinates formed by the focusing of multiple beams of light with different field of view angles after passing through the light guiding module, and then manufactures the display screen based on the imaging surface. The shape of the display screen is the same as the shape of the imaging surface. When the manufactured display screen is used in the near-eye display device, because the light is reversible, the image light emitted from the display screen can also enter the eye box position after passing through the light guiding module. This helps to increase the proportion of light received by the human eye, increase the field of view angle of the near-eye display device, and thus enhance the user's immersive experience. Furthermore, since the position of the display screen coincides with the position of the imaging surface, it can more effectively ensure that the light emitted from each area of ​​the display screen can clearly converge to the eye box for imaging, thereby improving image distortion caused by aberrations, chromatic aberration, or distortion, and thus improving the imaging quality of the near-eye display device.

[0013] In one embodiment, the step of calculating the imaging plane based on the complex image-side focal coordinates formed by focusing multiple beams of light with different field of view angles after passing through the light guiding module includes: Obtain the image-side focal coordinates of the multiple light beams with different field of view angles; The curvature or surface equation of the imaging surface is calculated based on the complex image focal coordinates.

[0014] In one embodiment, the step of fabricating the display screen based on the imaging surface includes: Provides cover plate and display module; The cover plate is bent according to the shape of the imaging surface; The display module is attached to the bent cover plate.

[0015] In one embodiment, the step of bending the cover plate according to the shape of the imaging surface specifically involves bending the cover plate using a hot bending technique.

[0016] In one embodiment, the steps following fabrication of the display screen based on the imaging surface include: The display screen is mounted at the position where the imaging surface, which is focused by multiple beams of light with different field of view angles projected from the position of the eye box onto the light guiding module, is located.

[0017] In one embodiment, the step of mounting the display screen to the imaging surface where multiple beams of light with different field of view angles projected from the eye box onto the light guiding module are focused includes: The performance of the near-eye display device was tested by emitting multiple beams of light with different field of view from the position of the eye box to determine whether the near-eye display device met the spot size requirements. If the light spot size requirement is met, the near-eye display device is manufactured; if the light spot size requirement is not met, the step of obtaining the parameters of the near-eye display device is repeated. Simple Explanation of the Diagram

[0018] Figure 1 is a schematic diagram of the optical path of a near-eye display device according to an embodiment of this application.

[0019] Figure 2 is a schematic diagram of the structure of a near-eye display device according to an embodiment of this application.

[0020] Figure 3 is a schematic flowchart of a near-eye display device manufacturing method according to an embodiment of this application.

[0021] Figure 4 is a schematic diagram of the optical path of a reverse optical path model established using ZEMAX software according to an embodiment of this application.

[0022] Figure 5 is a schematic diagram of the specific process of step S300 in an embodiment of this application.

[0023] Figure 6 is a schematic diagram of the optical path of the image surface obtained by calculation according to an embodiment of this application.

[0024] Figure 7 is a schematic diagram of the specific process of step S400 in an embodiment of this application.

[0025] Figure 8 is a flowchart illustrating the manufacturing method of a near-eye display device according to an embodiment of this application, including steps S500 and S600.

[0026] Figure 9 is a schematic diagram of multiple beams of light with different field of view projected from the position of the eye box through the light guiding module in the conventional technology.

[0027] Figure 10 is a schematic diagram of multiple beams of light with different field of view angles projected from the position of the eye box through the light guiding module in this application. Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of this application, and not all of them.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's description is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following detailed description of the present application is provided in conjunction with the accompanying drawings and preferred embodiments.

[0031] Please refer to Figures 1, 2, and 6 together. The near-eye display device 100 of this application embodiment includes a display screen 1 and a light guiding module 3. The display screen 1 is used to emit image light L1. The light guiding module 3 is used to receive the image light L1 and project the image light L1 onto the human eye E, so that the image light L1 located at the eye box 5 is received by the human eye E. The display screen 1 is positioned at the imaging surface 73 where multiple beams of light with different field of view angles are focused from the eye box 5 onto the light guiding module 3.

[0032] The eye box 5 is a cone-shaped area. Image light L1 located at the position of the eye box 5 can be received by the human eye E, that is, the area of ​​the eye box 5 is the area where the displayed content is clearest. In this embodiment, the size of the eye box 5 is 10mm × 10mm; in other embodiments, the size of the eye box 5 can also be 20mm × 20mm or other values, and this application does not impose any restrictions. In this embodiment, the near-eye display device 100 is a virtual reality head-mounted near-eye display device 100. In other embodiments, the near-eye display device 100 can also be any one of an augmented reality head-mounted near-eye display device 100, a mixed reality head-mounted near-eye display device 100, and a head-up near-eye display device 100, and this application does not impose any restrictions.

[0033] Specifically, the display screen 1 includes a cover plate 11 and a display module 13 attached to the cover plate 11. The cover plate 11 includes a display surface 111 for emitting image light L1. In this embodiment, the shape of the display surface 111 is the same as the shape of the imaging surface 73. Specifically, the size of the display surface 111 is the same as the size of the imaging surface 73, that is, the shape of the display surface 111 is the same as the shape and size of the imaging surface 73 obtained by the backlight path model. In other embodiments, the shape of the display surface 111 is the same as the shape of the imaging surface 73, but the size is different. This application does not impose any limitations.

[0034] In this embodiment, the display surface 111 is curved, meaning the display module 13 attached to the cover plate 11 is also curved, i.e., the display screen 1 is a curved screen. In other embodiments, depending on the focusing position of multiple beams of light with different viewing angles projected from the eye box 5 to the light guiding module 3, the display surface 111 may also be flat or irregular; this application does not impose any limitations. The display module 13 can be any one of a liquid crystal display module 13, a fast-response liquid crystal display module 13, a light-emitting diode display module 13, an organic light-emitting diode display module 13, and a micro light-emitting diode display module 13.

[0035] The light guiding module 3 includes a first lens 31, a semi-reflective film 32, a second lens 33, a composite film layer 34, and a third lens 35. The first lens 31 receives image light L1 emitted from the display screen 1. The semi-reflective film 32 is disposed on the side of the first lens 31 near the second lens 33, and partially transmits and partially reflects the image light L1. The composite film layer 34 is disposed between the second lens 33 and the third lens 35, and receives and changes the polarization state of the image light L1 so that the image light L1 is transmitted through the third lens 35. The composite film layer 34 includes a phase retardation layer 341 and a reflective polarization layer 343.

[0036] In this embodiment, the phase retardation layer 341 is disposed on the side of the second lens 33 away from the first lens 31, and the reflective polarization layer 343 is disposed on the side of the third lens 35 close to the second lens 33; in other embodiments, the reflective polarization layer 343 is disposed on the side of the third lens 35 close to the second lens 33, and the phase retardation layer 341 is disposed on the side of the reflective polarization layer 343 away from the third lens 35.

[0037] Specifically, the first lens 31 receives an image light L1 with a circularly polarized state; the image light L1 passes through the first lens 31 and is incident on the semi-reflective film 32. When incident on the semi-reflective film, half of the image light L1 with energy passes through the semi-reflective film and is incident on the second lens 33; the image light L1 passes through the second lens 33 and is incident on the composite film layer 34, wherein the phase retardation layer 341 is used to convert the image light L1 from a circularly polarized state to a linearly polarized state. The image light L1 that passes through the phase retardation layer 341 for the first time is reflected by the reflective polarization layer 343. After passing through the phase retardation layer 341 for the second time, it is incident on the semi-reflective film again. A portion of the image light L1 (at this time, the energy of the image light L1 is one-quarter of that before it was incident on the first lens 31) is reflected back to the composite film layer 34 by the semi-reflective film. After passing through the phase retardation layer 341 for the third time, the linearly polarized image light L1 continues to pass through the reflective polarization layer 343 and the third lens 35, and finally enters the human eye E.

[0038] The near-eye display device 100 provided in this application embodiment, by setting a display screen 1, is positioned at the imaging surface 73 where multiple beams of light with different viewing angles are focused from the position of the eye box 5 to the light guiding module 3. Since the light is reversible, the image light L1 emitted from the display screen 1 can also enter the position of the eye box 5 after passing through the light guiding module 3, thereby increasing the proportion of light received by the human eye E, increasing the viewing angle of the near-eye display device 100, and thus enhancing the user's sense of immersion in the picture. In addition, since the position of the display screen 1 coincides with the position of the imaging surface 73, it can be more effectively ensured that the light emitted from each area on the display screen 1 can be clearly converged to the eye box 5 for imaging, thereby improving the imaging quality of the near-eye display device 100.

[0039] Please refer to Figures 1 and 3 together. The method for manufacturing a display screen 1 provided in this application embodiment is used to manufacture a near-eye display device as described in any of the above embodiments. It includes the following steps S100 to S400. It should be noted that the manufacturing method of the display screen 1 in this application is not limited to the order of the following steps, and in other embodiments, the manufacturing method of the display screen 1 may include only a part of the following steps, or some of the steps may be deleted.

[0040] Step S100: Obtain the parameters of the near-eye display device, including the size of the eye box and the geometric and optical performance parameters of the light guiding module.

[0041] Step S200: Establish a backlight path model based on parameters. The backlight path model includes multiple beams of light with different field of view angles projected from the position of the eye box, and a light guiding module for receiving and guiding the light.

[0042] Step S300: Calculate the imaging plane based on the complex image focal coordinates formed by focusing multiple beams of light with different field of view after passing through the light guiding module.

[0043] Step S400: Fabricate a display screen based on the imaging surface, so that the shape of the display surface of the display screen is the same as the shape of the imaging surface.

[0044] In this embodiment, the size of the eye box 5 in step S100 is 10mm × 10mm; in other embodiments, the size of the eye box 5 can also be 20mm × 20mm or other values, and this application does not impose any restrictions. The geometric parameters of the light guiding module 3 specifically include: the thickness, aperture, radius of curvature, and Abbe number of the first lens 31, the second lens 33, and the third lens 35, as well as the refractive index of the first lens 31, the semi-reflective and semi-transparent film 32, the second lens 33, the composite film layer 34, and the third lens 35. The optical performance parameters of the light guiding module 3 specifically include: the focal length, field of view, optical transfer function, and wavefront aberration of the first lens 31, the second lens 33, and the third lens 35. In other embodiments, when the near-eye display device 100 includes other optical elements, the geometric parameters and optical performance parameters of the optical elements can also include other types, and this application does not impose any restrictions.

[0045] Please refer to Figures 3 and 4 together. In step S200, the backlight path model 700 is established based on the parameters. The backlight path model 700 can be established using MATLAB software or ZEMAX software. In this embodiment, ZEMAX software is used to establish the backlight path model 700. Specifically, the dimensions of the eye box 5 in the near-eye display device 100, the geometric parameters and optical performance parameters of the light guiding module 3 are input into the ZEMAX software. Then, the eye box 5, which was originally used to receive light, is used as the device for emitting light, and the backlight path model 700 output by the ZEMAX software can be obtained. The backlight path model 700 includes multiple beams of light with different field of view angles projected from the position of the eye box 5, and the light guiding module 3 used to receive and guide the light. The light rays with different field of view angles emitted from the eye box 5 are all converged by the light guiding module 3 to the side of the optical element away from the eye box 5, thereby forming a complex image-side focal point 71.

[0046] Please refer to Figures 3 and 5 together. Specifically, step S300, which calculates the imaging plane based on the complex image-side focal coordinates formed by focusing multiple beams of light with different field of view after passing through the light guiding module, includes steps S31 to S32:

[0047] Step S31: Obtain the image focal coordinates of multiple light rays with different field of view angles.

[0048] Step S32: Calculate the curvature or surface equation of the imaging surface based on the complex image-side focal coordinates.

[0049] Please refer to Figures 4, 5 and 6 together. Specifically, in step S31, the complex image-side focal point 71 coordinates of multiple rays with different field of view angles are obtained based on the backlight path model 700 established by ZEMAX software. For example, the image-side focal point 71 coordinates of rays with a field of view angle of 0°, 10°, 21°, 35° and 50° can be selected.

[0050] In this embodiment, the imaging surface 73 is a curved surface; in other embodiments, the imaging surface 73 may also be a plane or other surface with an irregular shape, and there is no limitation thereto. In step S32, the curvature or surface equation of the imaging surface 73 is obtained based on the coordinates of the complex image-side focal point 71. For example, the curvature or surface equation of the imaging surface 73 can be obtained by using MATLAB software, thereby obtaining the curvature or surface equation of the imaging surface 73, and then calculating the imaging surface 73 based on the curvature or surface equation of the imaging surface 73.

[0051] Please refer to Figures 1, 3, and 7 together. Specifically, step S400, which involves creating a display screen based on the imaging surface, includes steps S41 to S43:

[0052] Step S41: Provide a cover plate and a display module.

[0053] Step S42: Bend the cover plate according to the shape of the imaging surface.

[0054] Step S43: Attach the display module to the bent cover plate.

[0055] In this embodiment, the cover plate 11 in step S41 is made of glass. Using a glass cover plate 11 facilitates bending the cover plate 11 according to the shape of the imaging surface 73 and improves the stability of the cover plate 11 after bending. In other embodiments, the cover plate 11 may also be made of plastic, which is not limited in this application. The display module 13 is any one of a liquid crystal display module 13, a fast-response liquid crystal display module 13, a light-emitting diode display module 13, an organic light-emitting diode display module 13, and a micro light-emitting diode display module 13.

[0056] Specifically, in step S42, a hot bending technique is used to bend the cover plate 11 according to the shape of the imaging surface 73. Hot bending refers to heating the initial flat cover plate material to a bending temperature before bending the initial cover plate 11. By using hot bending to bend the cover plate 11 according to the shape of the imaging surface 73, it is beneficial to reduce stress rebound when bending the cover plate 11 according to the shape of the imaging surface 73, and to increase the stability of the cover plate 11 after molding.

[0057] Specifically, in step S43, the display module 13 is attached to the cover plate 11. The cover plate 11 and the display module 13 are attached using a planar cover plate 11 manufacturing process, thereby obtaining a display screen 1 that satisfies the shape of the imaging surface 73. That is, the display surface 111 of the display screen 1, which emits image light L1, coincides with the imaging surface 73. In this embodiment, the imaging surface 73 is curved, so the display surface 111 that coincides with the imaging surface 73 is also curved; that is, the display module 13 attached to the cover plate 11 is also curved. In other embodiments, the imaging surface 73 can also be a plane or other surfaces with irregular shapes; there is no limitation on this.

[0058] Please refer to Figure 8. After step S400, which involves creating the display screen based on the imaging surface, steps S500 to S600 are also included:

[0059] Step S500: Install the display screen at the position where the multiple beams of light with different field of view angles projected from the eye box onto the imaging surface of the light guiding module are focused.

[0060] Step S600: Perform a performance test on the near-eye display device. Multiple beams of light with different field of view are emitted from the position of the eye box to determine whether the near-eye display device meets the light spot size requirements. If the light spot size requirements are met, the near-eye display device is manufactured. If the light spot size requirements are not met, the step of obtaining the parameters of the near-eye display device is repeated.

[0061] Please refer to Figures 8, 9, and 10 together. After step S500 is completed, step S600 is executed. Specifically, in step S600, a schematic diagram of the light spot B, which is a multiple beam of light with different viewing angles projected from the position of the eye box through the light guiding module, and a schematic diagram of the light spot B obtained by a display screen using conventional technology (a regular display screen, not a display screen obtained based on the position of multiple beams of light with different viewing angles projected from the position of the eye box to the light guiding module) can be obtained. As shown in Figure 9, Figure 10 is a schematic diagram of the light spot B, which is a multiple beam of light with different viewing angles projected from the position of the eye box through the light guiding module in this application. By comparing the schematic diagram of the light spot B obtained by the display screen of this application with the schematic diagram of the light spot B obtained by the conventional technology, it is found that the light spot B of this application is smaller, that is, the aberration is smaller and the contrast is better, thus meeting the size requirement of the light spot B, and the near-eye display device is completed. If the light spot B schematic diagram obtained by comparing the display screen of this application with the light spot B schematic diagram obtained by using the prior art does not meet the light spot B size requirement, then the step of obtaining the parameters of the near-eye display device is repeated.

[0062] The near-eye display device manufacturing method provided in this application embodiment is used to manufacture a near-eye display device as described in any of the above embodiments. It establishes a backlight path model by acquiring parameters of the near-eye display device, calculates the imaging surface based on the complex image-side focal coordinates formed by multiple beams of light with different field of view focusing after passing through a light guiding module, and then manufactures a display screen based on the imaging surface. The shape of the display screen is the same as the shape of the imaging surface. When the manufactured display screen is used in the near-eye display device, because the light is reversible, the image light emitted from the display screen can also enter the eye box position after passing through the light guiding module. This helps to increase the proportion of light received by the human eye, increase the field of view of the near-eye display device, and thus enhance the user's immersive experience. Furthermore, since the position of the display screen coincides with the position of the imaging surface, it can more effectively ensure that the light emitted from each area of ​​the display surface can clearly converge to the eye box for imaging, thereby improving image distortion caused by aberrations, chromatic aberration, or distortion, and thus improving the imaging quality of the near-eye display device.

[0063] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of the present invention shall fall within the scope of protection claimed by the present invention.

[0064] 100: Near-eye display device 1: Display screen 11: Cover plate 111: Display Surface 13: Display Module 3: Light guiding module 31: First lens 32: Semi-reflective and semi-permeable membrane 33: Second lens 34: Composite film layer 341: Phase Delay Layer 343: Reflective polarization layer 35: Third Lens 5: Eye Box L1: Image Light E: Human eye 700: Backlighting Model 71: Image Focus 73: Imaging plane B: Light spot S100~S600, S31~S32, S41~S43: Steps

Claims

1. A near-eye display device, comprising: Display screen, the display screen being used to emit image light; The system includes a light guiding module for receiving the image light and projecting it onto the human eye, so that the image light located at the eye box position is received by the human eye; wherein the display screen is positioned at the imaging surface where multiple beams of light with different field of view angles projected from the eye box position onto the light guiding module are focused, the position of the display screen coincides with the position of the imaging surface, the display screen is a curved screen, and the display screen includes a cover plate whose display surface is curved.

2. The near-eye display device as described in claim 1, wherein, The display screen includes a display surface for emitting the image light, the shape of which is the same as the shape of the imaging surface.

3. The near-eye display device as described in claim 2, wherein, The size of the display surface is the same as the size of the imaging surface.

4. The near-eye display device as described in claim 1, wherein, The light guiding module includes a first lens, a semi-reflective and semi-transparent film, a second lens, a composite film layer, and a third lens. The first lens is used to receive the image light emitted from the display screen. The semi-reflective and semi-transparent film is disposed on the side of the first lens close to the second lens. The composite film layer is disposed between the second lens and the third lens. The composite film layer is used to receive and change the polarization state of the image light so that the image light is transmitted through the third lens.

5. The near-eye display device as described in claim 4, wherein, The composite film layer includes a phase retardation layer and a reflective polarization layer. The phase retardation layer is disposed on the side of the second lens away from the first lens, and the reflective polarization layer is disposed on the side of the third lens close to the second lens.

6. A method for manufacturing a near-eye display device, comprising: The parameters of the near-eye display device are obtained, including the dimensions of the eye box and the geometric and optical performance parameters of the light guiding module; a backlight path model is established based on the parameters, the backlight path model including multiple beams of light with different field of view angles projected from the position of the eye box and the light guiding module for receiving and guiding the light beams; the imaging surface is calculated based on the complex image-side focal coordinates formed by the multiple beams of light with different field of view angles after being focused by the light guiding module; the display screen is fabricated based on the imaging surface, so that the shape of the display surface of the display screen is the same as the shape of the imaging surface.

7. A method for manufacturing a near-eye display device as described in claim 6, wherein, The step of calculating the imaging surface based on the complex image-side focal coordinates formed by focusing multiple beams of light with different field of view after passing through the light guiding module includes: obtaining the image-side focal coordinates of the multiple beams of light with different field of view; and calculating the curvature or surface equation of the imaging surface based on the complex image-side focal coordinates.

8. A method for manufacturing a near-eye display device as described in claim 6, wherein, The steps of manufacturing the display screen according to the imaging surface include: providing a cover plate and a display module; bending the cover plate according to the shape of the imaging surface; and attaching the display module to the bent cover plate.

9. A method for manufacturing a near-eye display device as described in claim 8, wherein, The step of bending the cover plate according to the shape of the imaging surface specifically involves bending the cover plate using a hot bending technique.

10. A method for manufacturing a near-eye display device as described in claim 6, wherein, After fabricating the display screen according to the imaging surface, the method further includes: mounting the display screen to the position where the imaging surface, which is focused by multiple beams of light with different field of view angles projected from the position of the eye box onto the light guiding module.

11. A method for manufacturing a near-eye display device as described in claim 10, wherein, After installing the display screen at the position where multiple beams of light with different field of view angles projected from the eye box onto the imaging surface of the light guiding module are focused, the process further includes: performing a performance test on the near-eye display device by emitting multiple beams of light with different field of view angles from the eye box position to determine whether the near-eye display device meets the light spot size requirements; if the light spot size requirements are met, the fabrication of the near-eye display device is completed; if the light spot size requirements are not met, the step of obtaining the parameters of the near-eye display device is repeated.

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