VR optical system and near-to-eye display device

Abstract

The invention provides a VR optical system and near-to-eye display equipment, the VR optical system comprises a display screen, and the optical system further comprises a first lens group, a beam splitter prism and a second lens group from the human eye side to the display screen side in sequence; the distance between the display screen and the second lens group is adjustable; the system meets the following conditions: 3.2 lt; (D1-H1) / flt; d1 represents the total optical length of the first lens group, H1 represents the size of a display screen of the VR optical system, and f represents the focal length of the VR optical system; the VR optical system adopts a straight-through type optical structure, and the distance between the display screen and the second lens group is adjustable, so that the system has the advantages of high luminous efficiency, small distortion and high image definition while having a diopter adjustable function, and can bring excellent sensory experience to a user; the near-to-eye display device realizes a dual-band common-optical-path optical structure through optical path reflection of the beam splitter prism, and can realize an eye movement tracking function by matching with an infrared imaging system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of VR optical systems, in particular to a VR optical system and a near-eye display device. BACKGROUND

[0002] Virtual reality (VR) headsets can present large field of view, immersive high-quality graphics to users. In recent years, VR headsets have been widely used in games, military, education and medical industries, and the performance of the devices has been rapidly iterated and optimized.

[0003] However, the current VR headsets are limited in medical applications due to the imaging quality and optical configuration of the devices, and it is difficult to adapt to the application scenarios of MRI visual stimulation display, patient vision examination and other devices with high light efficiency, high image quality and low distortion. At the same time, the VR headsets usually adopt a fixed virtual image distance, and myopic and hyperopic patients need to wear glasses, which affects the comfort of the use process. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a VR optical system and a near-eye display device.

[0005] The VR optical system provided by the present application comprises a display screen; The VR optical system further comprises, from the side of the human eye to the side of the display screen: A first lens group, the first lens group comprising at least four lenses; The first lens group comprises, from the side of the human eye to the side of the display screen, a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, and a fourth lens with negative focal power; the first lens, the second lens, the third lens and the fourth lens are aligned at the center; A light splitting prism, the light splitting prism comprising an incident surface, an exit surface, a reflection surface and a transmission surface; A second lens group, the second lens group comprising at least six lenses; The second lens group comprises, from the side of the display screen to the side of the human eye, a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with positive focal power, and a tenth lens with negative focal power; the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are aligned at the center; The light signal emitted by the display screen is transmitted to the human eye in sequence through the second lens group, the light splitting prism and the first lens group; The transmission surface is arranged perpendicularly to the exit surface and the incident surface, and the reflection surface is arranged at a preset angle to the exit surface and the incident surface, the preset angle being selected in the range of 20° to 70°.

[0006] Preferably, the VR optical system satisfies the following conditional expression: 3.2 < |(D1-H1) / f| < 6.5, wherein D1 represents the total optical length of the first lens group, H1 represents the display screen size of the VR optical system, and f represents the focal length of the VR optical system.

[0007] Preferably, the VR optical system satisfies the following conditional expression: 3.9 < |(D1-D2) / f| < 7.6, wherein D1 represents the total optical length of the first lens group, D2 represents the total optical length of the second lens group, and f represents the focal length of the VR optical system.

[0008] Preferably, the first lens group comprises 4-7 lenses, and the second lens group comprises 8-10 lenses.

[0009] Preferably, the VR optical system satisfies the following conditional expression: 2.3 < |(D1-DM1) / f| < 5.4, wherein D1 represents the total optical length of the first lens group, DM1 represents the maximum optical aperture of the first lens group of the VR optical system, and f represents the focal length of the VR optical system.

[0010] Preferably, the VR optical system satisfies the following conditional expression: 2.0 < |(D1-DM2) / f| < 5.1, wherein D1 represents the total optical length of the first lens group, DM2 represents the maximum optical aperture of the second lens group of the VR optical system, and f represents the focal length of the VR optical system.

[0011] Preferably, the focal length of the VR optical system is -13mm > f > -17mm, and the focal length of the first lens group is 25mm > f1 > 32mm.

[0012] The near-eye display device provided by the application comprises the VR optical system and an eye movement tracking system. The eye movement tracking system comprises an infrared imaging system arranged on the light-transmitting side of the light-splitting prism, and the light-splitting prism is configured to turn the pupil information of the human eye received in the first lens group so that the pupil information of the human eye is incident into the infrared imaging system.

[0013] Preferably, the infrared imaging system comprises 3-4 lenses, and the infrared imaging system comprises at least two positive lenses.

[0014] Preferably, the focal length f3 of the infrared imaging system satisfies the following relationship: 8.4mm < f3 < 9.3mm, and the thickness TH3 of the infrared imaging system satisfies the following relationship: 12mm < TH3 < 30mm.

[0015] Compared with the prior art, the application has the following beneficial effects: The application provides a VR optical system and a near-eye display device. The optical system comprises a display screen, and sequentially comprises a first lens group, a light splitting prism and a second lens group from the human eye side to the display screen side. The display screen is adjustable in spacing relative to the second lens group. The system satisfies the following conditional expression: 3.2<|(D1-H1) / f|<6.5, wherein D1 represents the total optical length of the first lens group, H1 represents the display screen size of the refractive power adjustable optical system, and f represents the focal length of the optical system. The optical system adopts a straight-through optical structure. By adjusting the spacing of the display screen relative to the second lens group, the system has the advantages of high light efficiency, small distortion and high image definition while having the refractive power adjustable function, and can bring excellent sensory experience to the user. The near-eye display device realizes the optical structure of double-waveband common light path through light path reflection of the light splitting prism, and can realize eye movement tracking function in cooperation with an infrared imaging system. The optical structure of double-waveband common light path can allow the visible light for VR image display and the infrared light for eye movement tracking to share the first lens group for transmission, so that similar optical paths are obtained, the display module and the eye movement tracking module are placed close to each other, and the requirements of different scenes are met. BRIEF DESCRIPTION OF DRAWINGS

[0016] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings: Figure 1 is a structural schematic diagram of a VR optical system provided by the application; Figure 2 is a structural schematic diagram of a VR optical system provided by example 1 of the application; Figure 3 is a structural schematic diagram of a VR optical system provided by example 2 of the application; Figure 4 is a structural schematic diagram of a VR optical system provided by example 3 of the application; Figure 5 is an optical image quality diagram of a VR optical system provided by example 1 of the application; Figure 6 is an optical image quality diagram of a VR optical system provided by example 2 of the application; Figure 7 is an optical image quality diagram of a VR optical system provided by example 3 of the application; Figure 8 is an optical field curvature distortion diagram of a VR optical system provided by example 1 of the application; Figure 9 is an optical field curvature distortion diagram of a VR optical system provided by example 2 of the application; Figure 10This is an optical field distortion diagram of a VR optical system provided in Example 3 of the present invention; Figure 11 This is a schematic diagram of the structure of a near-eye display device provided by the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0018] Example 1 Virtual reality (VR) headsets offer users a wide field of view and immersive, high-quality graphics. In recent years, VR headsets have been widely used in various industries, including gaming, military, education, and healthcare, with their performance rapidly iterating and optimizing. However, current VR headsets in medical applications are limited by their imaging quality and optical configuration, making them unsuitable for applications requiring high light efficiency, high image quality, and low distortion, such as MRI visual stimulation display and patient vision examinations. Furthermore, VR headsets typically use a fixed virtual image distance, requiring nearsighted or farsighted patients to wear glasses, impacting user comfort. Additionally, the simultaneous use of the display module and eye-tracking module in VR headsets can lead to poor eye-tracking interaction, posing challenges to their use in various scenarios such as MRI and CT scans.

[0019] To address the aforementioned problems, this invention proposes a near-eye display system that combines high luminous efficiency, high image quality, and low distortion imaging advantages, while supporting virtual image distance adjustment. This system utilizes a dual-band common optical path technology (visible and infrared), enabling the combined use of VR headset modules and eye-tracking, effectively meeting market demands in various scenarios. The invention's solution is described below with reference to the accompanying drawings.

[0020] like Figure 1 The diagram shows a schematic of an optical system structure; the VR optical system includes a display screen 1, and the VR optical system further includes, from the human eye 5 side to the display screen 1 side, the following components: The first lens group 4 comprises at least four lenses, and from the human eye 5 side to the display screen 1 side, the first lens group 4 includes, in sequence: a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, and a fourth lens with negative optical power; the first lens, the second lens, the third lens, and the fourth lens are arranged sequentially along the optical axis, centered and with adjustable spacing. The beam splitter 3 includes an incident surface 31, an exit surface 32, a reflecting surface 33, and a transmitting surface 34. The second lens group 2 comprises at least six lenses, and sequentially comprises, from the display screen 1 side to the human eye 5 side, a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with positive focal power, and a tenth lens with negative focal power; the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are sequentially arranged along the optical axis, are centrally aligned, and have an adjustable interval; The light signal emitted by the display screen 1 is sequentially transmitted to the human eye 5 through the second lens group 2, the light splitting prism 3, and the first lens group 4, and the display screen 1 has an adjustable interval relative to the second lens group 2. The VR optical system also satisfies the following conditions: 3.2<|(D1-H1) / f|<6.5 Wherein D1 represents the total optical length of the first lens group 4, H1 represents the size of the display screen 1 of the VR optical system, and f represents the focal length of the VR optical system.

[0021] In the specific implementation process, the first lens group 4 can comprise four lenses, and sequentially comprises, from the human eye 5 side to the display screen 1 side, a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, and a fourth lens with negative focal power; or more than four lenses can be added on any side of the first lens, the second lens, the third lens, and the fourth lens, and the focal power of the first lens group 4 can be positive or negative.

[0022] In addition, the second lens group 2 can comprise six lenses, and sequentially comprises, from the display screen 1 side to the human eye 5 side, a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with positive focal power, and a tenth lens with negative focal power; the second lens group 2 can also comprise more than six lenses, and one or more lenses can be added on any side of the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, and the focal power of the second lens group 2 can be positive or negative.

[0023] In the specific implementation process, the display screen 1 is used to emit a light signal, and the light signal comprises image information. The display screen 1 can be one of Micro LED, OLED, LCD, LCOS, and M-OLED, and can provide high-definition image information for a refractive power-adjustable optical system.

[0024] In the specific implementation process, the light splitting prism 3 includes an incident surface 31, an emergent surface 32, a reflecting surface 33, and a transmitting surface 34; the transmitting surface 34 is arranged perpendicularly to the emergent surface 32 and the incident surface 31, the reflecting surface 33 is arranged at an angle to the emergent surface 32 and the incident surface 31, and the angle is selected in the range of 20°-70°, and 45° is optimal. For example, the light splitting prism 3 can be composed of two isosceles right-angle prisms, or two non-isosceles prisms combined into a rectangle.

[0025] The present application provides a VR optical system, and light transmission is as follows: an image in a display screen 1 of a near-eye display device is transmitted and magnified by a second lens group 2, a light splitting prism 3, and a first lens group 4 in the present application, and then transmitted to a human eye 5, at this time, the human eye 5 side receives a virtual image of the display screen 1 after magnification through the VR optical system. The VR optical system adopts a straight-through structure, light transmission is along the same straight line without multiple turns in the system, the light efficiency is high, the distortion is small, the image clarity is high, and the VR optical system is used on a near-eye display device, effectively improves the immersion of users, and can bring better experience to users. In addition, by adjusting the distance between the display screen 1 and the second lens group 2, the refractive power of the VR optical system can be adjusted, which is suitable for myopia and hypermetropia in addition to normal vision people.

[0026] In the example embodiment, the display screen 1 transmits image information through the second lens group 2 and the light splitting prism 3, and transmits the relay image to the human eye through the first lens group 4.

[0027] In the specific implementation process, the existence of the relay image is beneficial to improve the total optical length and provide more installation space for other functional devices. At the same time, the existence of the relay image can effectively limit the aperture of the module and the size of the final target surface under a longer total length.

[0028] In the example embodiment, the VR optical system satisfies the following condition formula: 3.9<|(D1-D2) / f|<7.6, wherein D1 represents the total optical length of the first lens group 4, D2 represents the total optical length of the second lens group 2, and f represents the focal length of the VR optical system. In this embodiment, by limiting the total optical length of the first lens group 4, the total optical length of the second lens group 2, and the focal length of the VR optical system, the image quality is improved and the user experience is improved.

[0029] In the example embodiment, the first lens group 4 includes 4-7 lenses, and in the specific implementation process, the first lens group 4 can include 4, 5, 6, or 7 lenses.

[0030] In the exemplary embodiment, the second lens group 2 contains 8-10 lenses, and in the specific implementation, the second lens group 2 can be 8, 9 or 10.

[0031] In the exemplary embodiment, the VR optical system satisfies the following condition: 2.3<|(D1-DM1) / f|<5.4, where D1 represents the total optical length of the first lens group 4, DM1 represents the maximum aperture of the first lens group 4 of the VR optical system, and f represents the focal length of the VR optical system. In this embodiment, the user's observation image clarity and eye comfort are improved by limiting the maximum aperture of the first lens group 4, the total optical length of the first lens group 4, and the focal length of the VR optical system.

[0032] In the exemplary embodiment, the VR optical system satisfies the following condition: 2.0<|(D1-DM2) / f|<5.1, where D1 represents the total optical length of the first lens group 4, DM2 represents the maximum aperture of the second lens group 2 of the VR optical system, and f represents the focal length of the optical system. In this embodiment, the user's observation image clarity and distortion are improved by limiting the total optical length of the first lens group 4, the maximum aperture of the second lens group 2, and the focal length of the optical system.

[0033] In the exemplary embodiment, the focal length of the optical system is -13mm>f>-17mm.

[0034] In the exemplary embodiment, the focal length of the first lens group is 25mm>f1>30mm.

[0035] The optical system and optical performance provided by the embodiments of the present application are described below by comparing Example 1 to Example 2 to Prior Art Example 3.

[0036]

[0037] In combination with the drawings Figure 2 , the drawings Figure 5 , and the drawings Figure 8 ; in this example, the first lens group of the optical system is 7 lenses, and the refractive power from the eye side is: positive refractive power, positive refractive power, positive refractive power, negative refractive power, positive refractive power, negative refractive power, positive refractive power, the second lens group is 9 lenses, and the refractive power from the eye side is: negative refractive power, negative refractive power, positive refractive power, positive refractive power, negative refractive power, positive refractive power, positive refractive power, positive refractive power, negative refractive power, in this example, the light efficiency is 90%, the field of view is 90°, the optical system has the advantages of adjustable diopter and high light efficiency, the drawings Figure 5 The optical image quality diagram shows that the system MTF in Example 1 is greater than 0.3, the drawings Figure 8The optical field curvature distortion chart shows that the system field curvature in Example 1 is less than 0.5 mm, and the optical distortion is less than 20%, which can bring an excellent sensory experience to the user.

[0038]

[0039] In combination with the attached Figure 3 , the attached Figure 6 and the attached Figure 9 ; in this example, the first lens group of the optical system is 7 lenses, and the optical power from the human eye side is: positive, positive, positive, negative, positive, negative, positive; the second lens group is 9 lenses, and the optical power from the human eye side is: negative, negative, positive, positive, negative, positive, positive, positive, negative; in this example, the light efficiency is 90%, and the field of view is 90°. The optical system has the advantages of adjustable diopter and high light efficiency, and the attached Figure 6 The optical image quality chart shows that the MTF of the system in Example 2 is greater than 0.8, and the attached Figure 8 The optical field curvature distortion chart shows that the system field curvature in Example 2 is less than 0.5 mm, and the optical distortion is less than 20%, which can bring an excellent sensory experience to the user.

[0040] By comparing Example 3 with Example 1 and Example 2, the optical system and optical performance provided by the embodiment of the application are further verified.

[0041]

[0042] In combination with the attached Figure 4 , the attached Figure 7 and the attached Figure 10 ; in this example, the first lens group of the optical system is 8 lenses, and the optical power from the human eye side is: positive, positive, positive, negative, positive, negative, negative, negative; the second lens group is 5 lenses, and the optical power from the human eye side is: negative, positive, positive, positive, negative; in this example, the light efficiency is only 60%, and the field of view is 90°. The attached Figure 7 The optical image quality chart shows that the MTF of the system in Example 3 is reduced to 0, Figure 10 The optical field curvature distortion chart shows that the system field curvature in Example 3 is greater than 20 mm, and the optical distortion is greater than 60%. Compared with Example 1 and Example 2, it can be seen that the light efficiency and image quality of the system are obviously worse than those of Example 1 and Example 2, and the system cannot bring a better sensory experience to the user.

[0043] Example 2 The present application provides a near-eye display device, such as Figure 11As shown, it is a structural schematic diagram of a near-eye display device provided by Example 3 of the present application, which includes the VR optical system in any of the above examples, and an eye movement tracking system 6. The eye movement tracking system 6 includes an infrared imaging system 61 and an infrared light source, and the infrared imaging system 61 is arranged on the side of the light-transmitting surface 34 of the light-splitting prism 3. Specifically, the reflecting surface 33 of the light-splitting prism 3 turns the information of the pupil of the human eye received in the first lens group 4 to be incident into the infrared imaging system 61, which is used in combination with the infrared light source to realize the eye movement tracking function of the user's eye, effectively reducing the thickness of the entire eye movement tracking system in the direction perpendicular to the optical axis, meeting the light and thin development needs of the near-eye display device, improving the quality of the display picture, and reducing the power consumption of the device.

[0044] In summary, in the near-eye display device, the light transmission of the VR optical system is divided into two directions: on the one hand, the light is transmitted from the display screen 1 side to the human eye 5 side (the optical path transmission is shown by the solid line A1 in the figure), and the image information emitted from the display screen 1 enters the human eye 5 after the second lens group 2, the light-splitting prism 3, and the first lens group 4, and a high-definition enlarged virtual image can be observed in the user's eye, which has an extremely realistic sensory experience. On the other hand, the light is emitted from the human eye 5 side, transmitted through the first lens group 4 of the refractive power adjustable optical system, and turned by the light-splitting prism 3 (the optical path transmission is shown by the dashed line A2 in the figure) into the infrared imaging system 61, and the first lens group 4 in the VR optical system is used in combination with the light-splitting prism 3 and the infrared imaging system 61 to transmit the position information of the pupil of the human eye to the eye movement tracking system, which can track the position information of the pupil of the human eye in real time, enhance the interactivity with the near-eye display device, improve the quality of the display picture of the gaze point of the human eye, and effectively reduce the power consumption of the device.

[0045] In an exemplary embodiment, the infrared imaging system 61 includes 3-4 lenses, and in the specific implementation process, the infrared imaging system 61 can be 3 or 4.

[0046] In an exemplary embodiment, the infrared imaging system 61 includes at least two positive lenses. In the specific implementation process, from the side of the light-splitting prism 3, the lens power arrangement of the infrared imaging system is any one of positive power, positive power, negative power, positive power, positive power, negative power, negative power, positive power, negative power, negative power, positive power, negative power, positive power.

[0047] In an exemplary embodiment, the focal length f3 of the infrared imaging system 61 satisfies the following relationship 8.4mm<f3<9.3mm. In the specific implementation process, f3 can be any one of 8.5mm, 8.6mm, 8.7mm, 8.8mm, 8.9mm, 9.0mm.

[0048] In the example embodiment, the infrared imaging system 61 has a thickness TH3 satisfying the following relationship: 12mm<TH3<30mm. In specific implementation, TH3 can be any one of 26.2mm, 13mm, 14mm, 15mm, 26.9mm, and 29.2mm. The near-eye display device provided by the example embodiment includes a VR optical system. The VR optical system has the advantages of high light efficiency, small distortion, high image definition, and adjustable diopter. The near-eye display device with the VR optical system also has the advantages of high light efficiency, small distortion, high image definition, and adjustable diopter, thereby improving the user experience of users with different degrees of myopia or hyperopia. Moreover, the VR optical system is used in combination with the infrared imaging system by using a beam splitter prism, thereby realizing an eye movement tracking scheme, improving the quality of the display picture at the gaze point of the human eye, and effectively reducing the power consumption of the device.

[0049] In the description of the present application, it should be understood that the terms “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which do not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict, provided that the combinations do not conflict.

Claims

1. A VR optical system characterized by comprising: The VR optical system comprises a display screen; The VR optical system further comprises, from the human eye side to the display screen side: a first lens group comprising at least four lenses; The first lens group comprises, from the human eye side to the display screen side: a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, and a fourth lens with negative focal power; the first lens, the second lens, the third lens, and the fourth lens are aligned at the center; a light splitting prism comprising an incident surface, an emission surface, a reflection surface, and a transmission surface; a second lens group comprising at least six lenses; The second lens group comprises, from the display screen side to the human eye side: a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with positive focal power, and a tenth lens with negative focal power; the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are aligned at the center; The light signal emitted by the display screen is transmitted to the human eye in sequence through the second lens group, the light splitting prism, and the first lens group; The transmission surface, the emission surface, and the incident surface are arranged perpendicularly, and the reflection surface is arranged at a preset angle with respect to the emission surface and the incident surface, and the preset angle is in the range of 20°-70°.

2. The VR optical system of claim 1, wherein The VR optical system satisfies the following condition formula: 3.2<|(D1-H1) / f|<6.5, wherein D1 represents the total optical length of the first lens group, H1 represents the display screen size of the VR optical system, and f represents the focal length of the VR optical system.

3. The VR optical system of claim 1, wherein The VR optical system satisfies the following condition formula: 3.9<|(D1-D2) / f|<7.6, wherein D1 represents the total optical length of the first lens group, D2 represents the total optical length of the second lens group, and f represents the focal length of the VR optical system.

4. The VR optical system of claim 1, wherein The first lens group comprises 4-7 lenses.

5. The VR optical system of claim 1, wherein The second lens group comprises 8-10 lenses.

6. The VR optical system of claim 1, wherein The VR optical system satisfies the following condition formula: 2.3<|(D1-DM1) / f|<5.4, wherein D1 represents the total optical length of the first lens group, DM1 represents the maximum optical aperture of the first lens group of the VR optical system, and f represents the focal length of the VR optical system.

7. The VR optical system of claim 1, wherein The VR optical system satisfies the following condition formula: 2.0<|(D1-DM2) / f|<5.1, wherein D1 represents the total optical length of the first lens group, DM2 represents the maximum optical aperture of the second lens group of the VR optical system, and f represents the focal length of the VR optical system.

8. The VR optical system of claim 1, wherein, The focal length of the VR optical system is -13mm>f>-17mm.

9. The VR optical system of claim 1, wherein, The focal length of the first lens group is 25mm>f1>32mm.

10. A near-eye display device, comprising: The VR optical system comprises the eye movement tracking system. The eye movement tracking system comprises an infrared imaging system arranged on the transmission surface side of the light splitting prism. The light splitting prism turns the human eye pupil information received in the first lens group to make the human eye pupil information incident into the infrared imaging system.

11. The near-eye display device of claim 10, wherein, The infrared imaging system comprises 3-4 lenses; the infrared imaging system comprises at least two positive lenses.

12. The near-eye display device of claim 10, wherein, The focal length f3 of the infrared imaging system satisfies the following relationship: 8.4mm 13. The near-eye display device of claim 10, wherein, The thickness TH3 of the infrared imaging system satisfies the following relationship: 12mm

Images