Near-eye display system and near-eye display device

Abstract

The present disclosure provides a near-eye display system and a near-eye display device, and relates to the technical field of display. The near-eye display system comprises an image providing assembly, an eyeball tracking assembly, a prism set and a first lens set. The prism set comprises a first prism, a second prism and a polarization beam splitting film. The first prism is located on the light exit side of the image providing assembly, and the second prism is located on the light exit side of the eyeball tracking assembly. The first lens set is located on the side of the first prism away from the polarization beam splitting film. In the present disclosure, the information light provided by the image providing assembly can be totally reflected after entering the first prism, and the information light after total reflection is reflected again by the polarization beam splitting film, thereby realizing multiple folding of the transmission path of the information light, so that the near-eye display system has a larger field of view. In addition, the second prism and the polarization beam splitting film can be multiplexed, the transmission path of the tracking light is shortened, the loss of the tracking light during transmission is reduced, and the reliability of the eye movement tracking is improved.

Description

Technical Field

[0001] This disclosure relates to the field of near-eye displays, and more specifically, to a near-eye display system and a near-eye display device. Background Technology

[0002] Augmented reality (AR) glasses project virtual images and real-world images simultaneously into the user's eyes, allowing them to see virtual images superimposed on real-world scenes. AR glasses can bring tremendous convenience to people's learning, work, life, entertainment, and other aspects. When users access information such as visual text, images, and videos, they can move freely and their hands are freed, greatly facilitating people's daily lives.

[0003] Existing AR glasses primarily rely on optical structures such as planar semi-transparent and semi-reflective surfaces, freeform surface semi-transparent and semi-reflective surfaces, geometric waveguides, and catadioptric structures to adjust the optical path and ensure the display quality of virtual images. Among these, catadioptric structures are widely used due to their excellent optical clarity and low optical distortion. Although catadioptric structures have significant advantages over other optical structures such as planar semi-transparent and semi-reflective surfaces, they still fall short of meeting the development needs of AR glasses products, such as a larger field of view and a smaller size.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a near-eye display system and near-eye display device.

[0006] The purpose of this disclosure is achieved through the following technical solution: According to one aspect of this disclosure, a near-eye display system is provided, comprising: Image providing component, used to provide information light carrying image information; An eye-tracking component that emits tracking light and receives the tracking light reflected from the human eye; A prism assembly includes a first prism and a second prism, and a polarizing beam splitter located between the first prism and the second prism. The first prism is located on the light-emitting side of the image providing component, and the second prism is located on the light-emitting side of the eye-tracking component. A first lens assembly is located on the side of the first prism away from the polarizing beam splitter and is spaced apart from the first prism. The information light provided by the image providing component enters the first prism, undergoes total internal reflection by the first prism, reaches the polarizing beam splitter, is then reflected by the polarizing beam splitter and passes through the first prism to the first lens group, is reflected by the first lens group, and then passes through the first prism, the polarizing beam splitter, and the second prism in sequence to enter the human eye; the tracking light emitted by the eye-tracking component passes through the second prism, is reflected by the polarizing beam splitter, and then passes through the second prism again to enter the human eye; the tracking light reflected by the human eye passes through the second prism, is reflected by the polarizing beam splitter, and then passes through the second prism again to enter the eye-tracking component.

[0007] According to another aspect of this disclosure, a near-eye display device is provided, comprising the near-eye display system described in the foregoing aspect.

[0008] The embodiments disclosed herein include at least the following beneficial effects: In this embodiment, based on the spacing between the first lens group and the first prism, the information light entering the first prism undergoes total internal reflection at the optical surface of the first prism near the first lens group. The reflected information light is then reflected again by a polarizing beam splitter. This allows the near-eye display system to achieve a larger field of view by repeatedly folding the transmission path of the information light while maintaining a compact design. Furthermore, for the tracking light emitted by the eye-tracking component, the second prism and polarizing beam splitter included in the prism group can be reused. This allows for folding of the tracking light transmission path without affecting structural complexity, while simultaneously shortening the transmission path and reducing light loss during transmission, thereby improving the reliability of eye-tracking in the near-eye display system.

[0009] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0010] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0011] Figure 1 A schematic diagram illustrating the structure of a near-eye display system provided in this disclosure is shown.

[0012] Figure 2 A schematic diagram illustrating the structure of another near-eye display system provided in this disclosure is shown.

[0013] Figure 3 A schematic diagram illustrating the structure of yet another near-eye display system provided in this disclosure is shown.

[0014] Figure 4 A schematic diagram illustrating the structure of yet another near-eye display system provided in this disclosure is shown.

[0015] Figure 5 A schematic diagram illustrating the structure of yet another near-eye display system provided in this disclosure is shown.

[0016] Figure 6 A schematic diagram illustrating the structure of another near-eye display system provided in this disclosure is shown.

[0017] Figure label: 10. Near-eye display system; 20. Human eye; 11. Image providing component; 12. Eye-tracking component; 13. Prism group; 14. First lens group; 15. Polarizer; 16. Second lens group; 121. Infrared light emitting module; 122. Eye-tracking module; 131. First prism; 132. Second prism; 133. Polarizing beam splitter; 1311, First optical surface; 1312, Second optical surface; 1321, Third optical surface; 1322, Fourth optical surface; 141. Quarter-wave plate; 142. Reflective coating; 143. First lens; 144. Second lens; 145. Fifth optical surface; 161. The third lens. Detailed Implementation

[0018] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0019] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0020] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0021] Figure 1 A schematic diagram illustrating the structure of a near-eye display system 10 provided in this disclosure is shown. Figure 1 As shown, the near-eye display system 10 includes an image providing component 11, an eye-tracking component 12, a prism group 13, and a first lens group 14. The image providing component 11 provides information light carrying image information, and the eye-tracking component 12 emits tracking light and receives tracking light reflected by the human eye 20. The prism group 13 includes a first prism 131 and a second prism 132, and a polarizing beam splitter 133 located between the first prism 131 and the second prism 132. The first prism 131 is located on the light-emitting side of the image providing component 11, and the second prism 132 is located on the light-emitting side of the eye-tracking component 12. The first lens group 14 is located on the side of the first prism 131 away from the polarizing beam splitter 133 and is spaced apart from the first prism 131.

[0022] Among them, such as Figure 1 As shown, the information light provided by the image providing component 11 enters the first prism 131, undergoes total internal reflection by the first prism 131, reaches the polarizing beam splitter 133, is then reflected by the polarizing beam splitter 133 and passes through the first prism 131 to the first lens group 14, is reflected by the first lens group 14, and then passes through the first prism 131, the polarizing beam splitter 133 and the second prism 132 in sequence to enter the human eye 20; the tracking light emitted by the eye tracking component 12 passes through the second prism 132, is reflected by the polarizing beam splitter 133, and then passes through the second prism 132 again to enter the human eye 20, and the tracking light reflected by the human eye 20 can pass through the second prism 132, be reflected by the polarizing beam splitter 133 and then pass through the second prism 132 again to enter the eye tracking component 12.

[0023] In this embodiment, based on the spacing between the first lens group 14 and the first prism 131, the information light entering the first prism 131 undergoes total internal reflection at the optical surface of the first prism 131 near the first lens group 14. The information light is then reflected again by the polarizing beam splitter 133. This allows the near-eye display system 10 to have a larger field of view by folding the light transmission path multiple times, while maintaining a small overall size design. Furthermore, for the tracking light emitted by the eye-tracking component 12, the second prism 132 and the polarizing beam splitter 133 included in the prism group 13 can be reused. This allows for folding of the tracking light transmission path without affecting structural complexity, shortening the path and reducing light loss during transmission, thereby improving the reliability of eye tracking in the near-eye display system 10.

[0024] For example, by combining the prism group 13 and the first lens group 14 described above, a near-eye display system 10 with a thickness of less than or equal to 13 mm and a field of view of greater than or equal to 60 degrees can be realized.

[0025] The image providing component 11 can be a liquid crystal display component based on LCD (Liquid Crystal Display) technology, an organic electroluminescence display component based on OLED (Organic Electroluminescence Display) technology, a quantum dot light-emitting diode display component based on LED (Light Emitting Diodes) technology, or a reflective matrix liquid crystal display component based on LCOS (Liquid Crystal on Silicon) technology, etc. Alternatively, the image providing component 11 can also be a Micro-OLED (Micro Organic Light Emitting Diode) microdisplay, a Micro-LED (Micro Light Emitting Diode) microdisplay, or an LBS (Laser Beam Scanning) light source for an equivalent screen, etc.

[0026] Among them, such as Figure 1As shown, the eye-tracking component 12 includes an infrared light emitting module 121 and an eye-tracking module 122. The eye-tracking module 122 includes a tracking sensor. The light-emitting side of the infrared light emitting module 121 and the light-sensing side of the tracking sensor both face the second prism 132. The infrared light emitting module 121 is used to emit infrared light as a tracking light, and the tracking sensor is used to collect the tracking light reflected back from the human eye 20.

[0027] In this embodiment of the disclosure, the information light provided by the image providing component 11 can be polarized light (such as circularly polarized light, linearly polarized light, etc.) or unpolarized light.

[0028] When the information light provided by the image providing component 11 is linearly polarized light, the vibration direction of the information light is perpendicular to the transmission axis of the polarizing beam splitter 133. This ensures that the information light emitted by the image providing component 11 and totally internally reflected by the first prism 131 can be reflected again by the polarizing beam splitter 133, and the information light reflected by the first lens group 14 can pass through the polarizing beam splitter 133. For example, such as... Figure 1 As shown, the information light provided by the image providing component 11 is S-polarized light (vertically polarized light), and the transmission axis of the polarizing beam splitter 133 is horizontal. At this time, the polarizing beam splitter 133 can reflect the information light (S-polarized light) emitted by the image providing component 11 after total internal reflection by the first prism 131 again. The information light (S-polarized light) reflected by the polarizing beam splitter 133 is reflected by the first lens group 14, and the information light reflected by the first lens group 14 is P-polarized light (horizontally polarized light), thereby ensuring that the information light (P-polarized light) reflected by the first lens group 14 can pass through the polarizing beam splitter 133 and enter the human eye 20.

[0029] When the information light provided by the image providing component 11 is unpolarized light, such as Figure 2 As shown, a polarizer 15 is provided on the light-emitting side of the image providing component 11. The polarizer 15 is used to modulate the information light provided by the image providing component 11 into polarized light, so that the information light provided by the image providing component 11 is reflected by the polarizing beam splitter 133 after total internal reflection by the first prism 131. In this way, at least part of the information light provided by the image providing component 11 after total internal reflection by the first prism 131 can be prevented from passing through the polarizing beam splitter 133, thereby forming stray light and affecting the image quality. For example, as... Figure 2As shown, the information light provided by the image providing component 11 can be modulated into S-polarized light by the polarizer 15. The transmission axis of the polarizing beam splitter 133 is horizontal. At this time, the polarizing beam splitter 133 can reflect the information light (S-polarized light) modulated by the polarizer 15 and totally reflected by the first prism 131 again. The information light (S-polarized light) reflected by the polarizing beam splitter 133 is reflected by the first lens group 14, and the information light reflected by the first lens group 14 is P-polarized light (horizontally polarized light), thereby ensuring that the information light (P-polarized light) reflected by the first lens group 14 can pass through the polarizing beam splitter 133 and enter the human eye 20.

[0030] In some implementations, such as Figure 3 As shown, a second lens group 16 is disposed between the image providing component 11 and the first prism 131.

[0031] Thus, based on the arrangement of the second lens group 16, the information light provided by the image providing component 11 can be modulated to ensure that the information light provided by the image providing component 11 enters the first prism 131 in a parallel or nearly parallel manner, thereby ensuring that all information light is totally reflected in the first prism 131, thus ensuring the imaging quality of the information light provided by the image providing component 11 in the human eye 20.

[0032] The second lens group 16 includes lenses made of materials such as optical plastics and optical glass. For example... Figure 3 As shown, the second lens group 16 includes at least a third lens 161 with positive optical power, so that the third lens 161 can be a biconvex lens or, based on this, a convex lens. Figure 3 The plano-convex lens shown, etc., and when the third lens 161 is a plano-convex lens, the plane of the third lens 161 faces the image providing component 11.

[0033] Furthermore, the second lens 144 also includes a fourth lens with negative optical power, and the fourth lens can be a biconcave lens or a plano-concave lens, etc. In this way, based on the cooperation of the third lens 161 and the fourth lens, the area illuminated by the information light provided by the image providing component 11 on the first prism 131 can be adjusted.

[0034] The fourth lens can be located on the side of the third lens 161 closer to the image providing component 11, or it can be located on the side of the third lens 161 away from the image providing component 11.

[0035] It should be noted that, in conjunction with the above description, a polarizer 15 is provided on the light-emitting side of the image providing component 11. In this case, the polarizer 15 can be as follows: Figure 3The polarizer 15 is located on the side of the second lens group 16 closer to the image providing component 11, as shown, or it can be located on the side of the second lens group 16 away from the image providing component 11. Of course, when the second lens group 16 includes multiple lenses, the polarizer 15 can also be located between any two lenses (for example, the polarizer 15 is located between the third lens 161 and the fourth lens), and this disclosure does not limit this.

[0036] In this embodiment of the disclosure, the first prism 131, the second prism 132, and the polarizing beam splitter 133 included in the prism group 13 are all attached to the polarizing beam splitter 133.

[0037] Thus, based on the bonding of the first prism 131 and the polarizing beam splitter 133, the refraction of the information light after total internal reflection by the first prism 131 when it exits the first prism 131 can be avoided, as well as the total internal reflection and / or refraction of the information light reflected by the first lens group 14 when it passes through the first prism 131; based on the bonding of the second prism 132 and the polarizing beam splitter 133, the refraction of the tracking light passing through the second prism 132 can be avoided.

[0038] The materials of the first prism 131 and the second prism 132 can be optical plastics, optical glass, etc. Both the first prism 131 and the second prism 132 have a bonding surface facing the polarizing beam splitter 133, and the bonding surfaces of the first prism 131 and the second prism 132 are fixed to the polarizing beam splitter 133 by means of adhesive bonding or other methods to achieve the bonding arrangement of the first prism 131 and the second prism 132 with the polarizing beam splitter 133.

[0039] Among them, such as Figure 1 , Figure 2 or Figure 3 As shown, the first prism 131 also has a first optical surface 1311 facing the first lens group 14 (i.e. facing away from the second prism 132) and a second optical surface 1312 facing the image providing component 11. The second prism 132 also has a third optical surface 1321 facing the eye tracking component 12 and a fourth optical surface 1322 facing the human eye 20 (i.e. facing away from the first prism 131).

[0040] In some embodiments, the minimum distance between the first optical surface 1311 and the first lens group 14 is greater than or equal to 0.01 mm.

[0041] This facilitates the spacing between the first prism 131 and the first lens group 14, and based on the air gap between the first prism 131 and the first lens group 14, the first optical surface 1311 forms an interface between an optically denser medium and an optically less dense medium. This ensures that when the incident angle of the information light provided by the image providing component 11 is greater than the critical incident angle, total internal reflection can occur on the inner side of the first optical surface 1311 (i.e., the side of the first optical surface 1311 closer to the inside of the first prism 131, or the side of the first optical surface 1311 away from the first lens group 14).

[0042] For example, the minimum distance between the first optical surface 1311 of the first prism 131 and the first lens group 14 is 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, etc.

[0043] In some embodiments, the angle between the principal optical axis of the second optical surface 1312 and the normal of the first optical surface 1311 is greater than or equal to 35 degrees and less than or equal to 75 degrees.

[0044] Thus, by limiting the angle between the principal optical axis of the second optical surface 1312 and the normal of the first optical surface 1311, the incident angle of the information light entering the first prism 131 along the second optical surface 1312 is ensured at the first optical surface 1311. This ensures that the information light entering the first prism 131 can undergo total internal reflection at the first optical surface 1311. At the same time, it avoids the information light from having too large an incident angle at the first optical surface 1311, which would prevent the information light reflected by the first lens group 14 from forming an image at the focal point of the human eye 20, thereby affecting the viewing effect of the human eye 20.

[0045] For example, the angle between the principal optical axis of the second optical surface 1312 and the normal of the first optical surface 1311 is 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, etc.

[0046] The second optical surface 1312 can be a plane or a curved surface (such as a spherical or non-spherical surface). When the second optical surface 1312 is a curved surface, it can be as follows: Figure 1 Figure 2 or Figure 3 The entire area of ​​the second optical surface 1312 shown is curved, or it can be the area of ​​the second optical surface 1312 facing the image providing component 11 that is curved. The curved surface on the second optical surface 1312 can be a convex surface facing the image providing component 11 or a concave surface facing the image providing component 11, which can be set according to the information light entering the first prism 131.

[0047] For example, in conjunction with the above, such as Figure 3As shown, when the image providing component 11 is provided with a second lens group 16 including a third lens 161 on the light-emitting side, the second optical surface 1312 of the first prism 131 is a curved surface that protrudes toward the image providing component 11.

[0048] In some embodiments, the mating surface of the first prism 131 is a plane, and the angle between the mating surface of the first prism 131 and the first optical surface 1311 is greater than or equal to 20 degrees and less than or equal to 35 degrees.

[0049] Thus, by limiting the angle between the mating surface of the first prism 131 and the first optical surface 1311, which is also limiting the angle between the polarizing beam splitter 133 and the first optical surface 1311, it is ensured that the information light reflected by the polarizing beam splitter 133 can pass through the first optical surface 1311, avoiding total internal reflection at the first optical surface 1311; at the same time, it is ensured that the information light reflected by the polarizing beam splitter 133 can be transmitted in a direction approximately parallel to the visual axis of the human eye 20, thereby avoiding significant refraction of the information light reflected by the polarizing beam splitter 133 at the first optical surface 1311, thus ensuring the imaging quality of the information light reflected by the first lens group 14 at the focal point of the human eye 20.

[0050] For example, the angle between the mating surface of the first prism 131 and the first optical surface 1311 is 20 degrees, 23 degrees, 26 degrees, 29 degrees, 32 degrees, 35 degrees, etc.

[0051] In some implementations, such as Figure 1 , Figure 2 or Figure 3 As shown, at least the area on the third optical surface 1321 directly opposite the eye-tracking component 12 is a curved surface.

[0052] Thus, the curved surface provided on the third optical surface 1321 facilitates the modulation of the tracking light emitted by the eye-tracking component 12 and the tracking light reflected by the human eye 20, ensuring that the tracking light emitted by the eye-tracking component 12 can cover the entire human eye 20, and that the tracking light reflected back from the human eye 20 can be collected by the eye-tracking component 12.

[0053] In conjunction with the above description, the eye-tracking component 12 includes an infrared light emitting module 121 and an eye-tracking module 122, which can be as follows: Figure 1 , Figure 2 or Figure 3 As shown, the areas on the third optical surface 1321 facing the infrared light emitting module 121 and the areas facing the eye tracking module 122 are both set as curved surfaces; of course, the entire area of ​​the third optical surface 1321 can also be curved, and this embodiment does not limit this.

[0054] When both the area on the third optical surface 1321 facing the infrared light emitting module 121 and the area facing the eye-tracking module 122 are set as curved surfaces, since the infrared light emitting module 121 included in the eye-tracking component 12 is usually a point light source, the area on the third optical surface 1321 facing the infrared light emitting module 121 can be set as follows: Figure 1 , Figure 2 or Figure 3 As shown, the concave surface facing the infrared light emitting module 121, correspondingly, the area on the third optical surface 1321 facing the eye-tracking module 122 is configured as follows: Figure 1 , Figure 2 or Figure 3 The concave surface facing the eye-tracking module 122 is shown.

[0055] Thus, the tracking light emitted by the infrared light emitting module 121 is diffused when it passes through the third optical surface 1321 to ensure coverage of the entire human eye 20, and the tracking light reflected back from the human eye 20 is converged when it passes through the third optical surface 1321 to ensure that the eye tracking module 122 can collect the tracking light.

[0056] In some embodiments, the fourth optical surface 1322 of the second prism 132 and the first optical surface 1311 of the first prism 131 are equidistant at any position in a direction parallel to the principal optical axis toward the human eye 20.

[0057] Thus, since the fourth optical surface 1322 and the first optical surface 1311 are equidistant at any position, the fourth optical surface 1322 and the first optical surface 1311 can be arranged in parallel to ensure that the information light reflected by the first lens group 14 can directly enter the human eye 20 when it passes through the first prism 131, the polarizing beam splitter 133 and the second prism 132 in sequence, thus ensuring the imaging quality of the information light in the human eye 20.

[0058] The fourth optical surface 1322 and the first optical surface 1311 can both be planes or curved surfaces with equal curvature, to ensure that the distance between the fourth optical surface 1322 and the first optical surface 1311 is equal at any position in a direction parallel to the principal optical axis facing the human eye 20. The case where both the fourth optical surface 1322 and the first optical surface 1311 are planes can be considered planes in a strict sense, or they can be planes in a non-strict sense, i.e., planes with a certain degree of flatness error. Furthermore, the parallel arrangement of the fourth optical surface 1322 and the first optical surface 1311 can be described as parallel in a non-strict sense. That is, in the direction parallel to the principal optical axis toward the human eye 20, the distance between the fourth optical surface 1322 and the first optical surface 1311 at any position is basically close. In other words, in the direction parallel to the principal optical axis toward the human eye 20, the maximum difference between the distance between the fourth optical surface 1322 and the first optical surface 1311 at any position is less than a reference value. This reference value can be determined based on the manufacturing process of the first prism 131 and the second prism 132.

[0059] In this embodiment of the present disclosure, the first lens group 14 is mainly used to reflect the information light reflected by the polarization beam splitter 133, while ensuring that the reflected information light can pass through the polarization beam splitter 133.

[0060] Specifically, such as Figure 1 , Figure 2 or Figure 3 As shown, the first lens group 14 includes at least a quarter-wave plate 141 and a reflective film 142. The quarter-wave plate 141 is located on the side of the reflective film 142 closer to the first prism 131. The quarter-wave plate 141 is used to adjust the polarization state of the information light reflected by the polarizing beam splitter 133. The reflective film 142 is used to reflect the information light transmitted through the quarter-wave plate 141 back to the quarter-wave plate 141, and after the polarization state is adjusted again by the quarter-wave plate 141, it passes through the prism group 13 (first prism 131, second prism 132 and polarizing beam splitter 133) and enters the human eye 20. In this way, the polarization state of the information light can be adjusted based on the cooperation of the quarter-wave plate 141 and the reflective film 142, thereby ensuring that the information light can enter the human eye 20.

[0061] The optical path of the information light in the first lens group 14 is as follows: the information light reflected by the polarizing beam splitter 133 and transmitted through the first prism 131 is first modulated by the quarter-wave plate 141, then the first modulated information light is reflected by the reflective film 142, and finally the information light reflected by the reflective film 142 is modulated a second time by the quarter-wave plate 141, and the second modulated information light can pass through the polarizing beam splitter 133.

[0062] For example, the optical axis of the quarter-wave plate 141 is at a 45-degree angle to the vibration direction of the information light reflected by the polarizing beam splitter 133, so as to ensure that the information light reflected by the polarizing beam splitter 133, after being modulated twice by the quarter-wave plate 141 and reflected by the reflective film 142, can make the vibration direction of the information light returning to the polarizing beam splitter 133 parallel to the transmission axis of the polarizing beam splitter 133, thereby ensuring that the information light passes directly through the polarizing beam splitter 133.

[0063] For example, in conjunction with the above description, the information light reflected by the polarizing beam splitter 133 is S-polarized light, and the optical axis of the quarter-wave plate 141 is at a 45-degree angle to the vibration direction of the information light (S-polarized light) reflected by the polarizing beam splitter 133. At this time, the information light after the first modulation is left-handed or right-handed polarized light, and the rotation direction of the information light reflected by the reflective film 142 is opposite to the rotation direction of the information light after the first modulation. The information light after the second modulation is P-polarized light, thereby ensuring that the information light after the second modulation can pass through the polarizing beam splitter 133.

[0064] In some implementations, such as Figure 3 or Figure 4 As shown, the first lens group 14 also includes a first lens 143, which is located on the side of the quarter-wave plate 141 away from the first prism 131 and has a fifth optical surface 145, on which a reflective film 142 is disposed.

[0065] In this way, the first lens 143 can be used to support the reflective film 142, thereby ensuring that the reflective film 142 reliably reflects the information light transmitted through the quarter-wave plate 141.

[0066] The material of the first lens 143 can be optical plastic, optical glass, etc.; the reflective film 142 can be bonded and fixed on the fifth optical surface 145 of the first lens 143, or it can be directly formed on the fifth optical surface 145 of the first lens 143 by a coating process.

[0067] The fifth optical surface 145 of the first lens 143 can be a spherical surface or a non-spherical surface. The fifth optical surface 145 of the first lens 143 can be a convex surface away from the quarter-wave plate 141, that is, as... Figure 3 As shown, the fifth optical surface 145 is the surface of the first lens 143 facing away from the quarter-wave plate 141, and the fifth optical surface 145 is a convex surface; of course, the fifth optical surface 145 of the first lens 143 can be a concave surface close to the quarter-wave plate 141, that is, as shown... Figure 4 As shown, the fifth optical surface 145 is the surface of the first lens 143 near the quarter-wave plate 141, and the fifth optical surface 145 is concave.

[0068] The quarter-wave plate 141 included in the first lens group 14 can be disposed separately or fixed to the lens included in the first lens group 14. For example, as... Figure 3 As shown, the first lens 143 is a plano-convex lens, and the plane of the first lens 143 faces the quarter-wave plate 141. At this time, the quarter-wave plate 141 can be fixed to the plane of the first lens 143, and the reflective film 142 can be fixed to the convex surface of the first lens 143 (i.e., the fifth optical surface 145).

[0069] In some embodiments, the reflective film 142 included in the first lens group 14 is a total reflection film.

[0070] Thus, based on the total reflection film, it can be ensured that all the information light rays incident on the first lens group 14 can be reflected to the prism group 13, so as to ensure the information light rays incident on the human eye 20, thereby ensuring the imaging quality of the information light rays at the focal point of the human eye 20.

[0071] In other embodiments, the first lens group 14 includes a reflective film 142 that is semi-transparent and semi-reflective.

[0072] Thus, based on the semi-transparent and semi-reflective film, the first lens group 14 can be guaranteed to have both reflective and transparent effects. This allows the first lens group 14 to reflect information light while ensuring that the human eye 20 can observe the real scene outside through the prism group 13 and the first lens group 14, thereby realizing the superposition of virtual images in the real scene outside and improving the visual effect of the human eye 20.

[0073] The reflective film 142 has a reflectivity greater than or equal to 5% and less than or equal to 90%. For example, the reflectivity of the reflective film 142 can be 5%, 10%, 20%, 30%, 50%, 70%, or 90%. In addition, as mentioned above, the fourth optical surface 1322 of the second prism 132 and the first optical surface 1311 of the first prism 131 are both planes and parallel to each other. In this case, for the prism group 13, which is approximately a plane mirror, when the human eye 20 observes the external scene through the prism group 13 and the first lens group 14, visual deviations caused by the external environment are avoided, thereby ensuring the clarity of the external environment scene.

[0074] In some implementations, such as Figure 5 or Figure 6 As shown, the first lens group 14 also includes a second lens 144, which is located on the same side of the quarter-wave plate 141 as the first lens 143, and the optical power sign of the second lens 144 is opposite to that of the first lens 143.

[0075] Thus, by combining the settings of the first lens 143 and the second lens 144, the refractive power of the first lens group 14 can be adjusted to approximately 0 when the optical power signs of the first lens 143 and the second lens 144 are opposite. That is, the first lens group 14 is approximately a plane mirror, so as to ensure that the light from the external scene can pass through the first lens group 14 in an approximately parallel light path. This avoids visual deviation of the external environment when the human eye 20 observes the external scene through the first lens group 14, and ensures the clarity of the external environment image.

[0076] The material of the second lens 144 can be optical plastic, optical glass, etc. Furthermore, in conjunction with the above, if the first lens 143 is a lens with positive optical power, then the second lens 144 is a lens with negative optical power; or, if the first lens 143 is a lens with negative optical power, then the second lens 144 is a lens with positive optical power.

[0077] When the first lens 143 has positive optical power and the second lens 144 has negative optical power, for example, as Figure 5 As shown, the second lens 144 is located on the side of the first lens 143 that is away from the quarter-wave plate 141. In this case, the first lens 143 and the second lens 144 can be fixed by gluing, thereby avoiding the situation where the thickness of the near-eye display system 10 is too large.

[0078] When the first lens 143 has negative optical power and the second lens 144 has positive optical power, for example, as... Figure 6 As shown, the second lens 144 is located on the side of the first lens 143 away from the quarter-wave plate 141. In this case, the first lens 143 and the second lens 144 can be fixed by gluing, thereby avoiding the situation where the thickness of the near-eye display system 10 is too large.

[0079] This disclosure also provides a near-eye display device, which includes the near-eye display system 10 described in the above embodiments.

[0080] Among them, near-eye display devices can be augmented reality glasses (AR glasses), virtual reality glasses (VR glasses), mixed reality glasses (MR glasses), head-mounted displays, etc.

[0081] In addition to the near-eye display system 10, the near-eye display device also includes a power supply module for power supply, a communication module for information interaction with other terminal devices, a processor for controlling the power supply module, communication module and display components, a circuit board for integrating the power supply module, communication module, display components and processor and other structures, and mechanical structures such as brackets and housings for fixing the various structures and facilitating user wear. In this embodiment, these structures are not specifically limited.

[0082] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A near-eye display system (10), characterized in that, include: Image providing component (11) for providing information light carrying image information; An eye-tracking component (12) is used to emit tracking light and to receive tracking light reflected from the human eye (20); The prism assembly (13) includes a first prism (131) and a second prism (132), and a polarizing beam splitter (133) located between the first prism (131) and the second prism (132). The first prism (131) is located on the light-emitting side of the image providing component (11), and the second prism (132) is located on the light-emitting side of the eye-tracking component (12). The first lens assembly (14) is located on the side of the first prism (131) away from the polarizing beam splitter (133) and is spaced apart from the first prism (131). The information light provided by the image providing component (11) enters the first prism (131), undergoes total internal reflection by the first prism (131), reaches the polarizing beam splitter (133), is then reflected by the polarizing beam splitter (133), passes through the first prism (131) to the first lens group (14), is reflected by the first lens group (14), and then passes through the first prism (131), the polarizing beam splitter (133) and the second prism (132) in sequence to enter the human eye (20). The tracking light emitted by the eye tracking component (12) passes through the second prism (132), is reflected by the polarizing beam splitter (133), and then passes through the second prism (132) again to enter the human eye (20). The tracking light reflected by the human eye (20) passes through the second prism (132), is reflected by the polarizing beam splitter (133), and then passes through the second prism (132) again to enter the eye tracking component (12).

2. The near-eye display system as described in claim 1, characterized in that, The first prism (131) has a first optical surface (1311) facing the first lens group (14), and the minimum distance between the first optical surface (1311) and the first lens group (14) is greater than or equal to 0.01 mm.

3. The near-eye display system as described in claim 2, characterized in that, The first prism (131) has a second optical surface (1312) facing the image providing component (11). The angle between the principal optical axis of the second optical surface (1312) and the normal of the first optical surface (1311) is greater than or equal to 35 degrees and less than or equal to 75 degrees.

4. The near-eye display system as described in claim 3, characterized in that, Both the first prism (131) and the second prism (132) are attached to the polarizing beam splitter (133). The attachment surface of the first prism (131) facing the polarizing beam splitter (133) is a plane, and the angle between the attachment surface of the first prism (131) and the first optical surface (1311) is greater than or equal to 20 degrees and less than or equal to 35 degrees.

5. The near-eye display system as described in claim 2, characterized in that, The second prism (132) has a third optical surface (1321) facing the eye-tracking component (12), and the area of ​​the third optical surface (1321) facing at least the eye-tracking component (12) is curved.

6. The near-eye display system as described in claim 2, characterized in that, The second prism (132) has a fourth optical surface (1322) for facing the human eye (20). In a direction parallel to the principal optical axis toward the human eye, the fourth optical surface (1322) is equidistant from the first optical surface (1311) at any position.

7. The near-eye display system as described in any one of claims 1-6, characterized in that, The first lens group (14) includes a first lens (143), a quarter-wave plate (141) and a reflective film (142). The quarter-wave plate (141) is located between the prism group (13) and the reflective film (142). The first lens (143) is located on the side of the quarter-wave plate (141) away from the first prism (131) and has a fifth optical surface (145). The reflective film (142) is disposed on the fifth optical surface (145). The quarter-wave plate (141) is used to adjust the polarization state of the information light reflected by the polarizing beam splitter (133). The reflective film (142) is used to reflect the information light transmitted through the quarter-wave plate (141) back to the quarter-wave plate (141), and after the polarization state is adjusted again by the quarter-wave plate (141), it passes through the prism group (13) and enters the human eye (20).

8. The near-eye display system as described in claim 7, characterized in that, The fifth optical surface (145) is the surface of the first lens (143) facing away from the quarter-wave plate (141), and the fifth optical surface (145) is a convex surface.

9. The near-eye display system (10) as described in claim 7, characterized in that, The reflective film (142) is a semi-transparent and semi-reflective film.

10. The near-eye display system as described in claim 9, characterized in that, The first lens group (14) further includes a second lens (144), which is located on the same side of the quarter-wave plate (141) as the first lens (143), and the optical power sign of the second lens (144) is opposite to that of the first lens (143).

11. The near-eye display system (10) as claimed in claim 10, characterized in that, The first lens (143) has positive optical power, the second lens (144) has negative optical power, and the second lens (144) is located on the side of the first lens (143) away from the quarter-wave plate (141).

12. The near-eye display system (10) as described in any one of claims 1-6, characterized in that, The image providing component (11) is provided with a polarizer (15) on the light-emitting side, which is used to modulate the information light provided by the image providing component (11) into polarized light, so that the information light provided by the image providing component (11) is reflected by the polarizing beam splitter (133) after total internal reflection by the first prism (131).

13. The near-eye display system as described in any one of claims 1-6, characterized in that, A second lens group (16) is disposed between the image providing component (11) and the first prism (131).

14. A near-eye display device, characterized in that, Includes the near-eye display system (10) according to any one of claims 1-13.

15. The near-eye display device as described in claim 14, characterized in that, The near-eye display device is augmented reality glasses or a head-mounted display.

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