Near-to-eye display system and near-to-eye display equipment

Abstract

The invention provides a near-to-eye display system and near-to-eye display equipment, and relates to the technical field of display. The near-to-eye display system comprises a first image source, a second image source, a prism assembly and a first focusing assembly, the prism assembly comprises a first prism, a second prism, a first optical splitter and a second optical splitter; a first light ray emitted by the first image source passes through the second prism after being subjected to internal total reflection of the first prism, reflection of the first optical splitter and reflection of the second optical splitter so as to form a first virtual image; the second light emitted by the second image source passes through the first focusing assembly and then passes through the prism assembly to form a second virtual image. In the embodiment of the invention, on the basis of ensuring that the near-eye display system has a small-size design, the near-eye display system has a larger field angle; besides, based on the first virtual image and the second virtual image which are respectively formed at different positions, the problem that the focusing depth and the convergence depth are inconsistent is improved, and the condition of causing visual fatigue is reduced or even avoided.

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] In related technologies, when AR glasses display 3D images, users perceive the 3D effect by forming different parallax images with their left and right eyes. However, since the focusing depth generated by the lens adjustment is always fixed on the display screen, while the convergence depth generated by the difference in viewing angle between the left and right eyes changes with the spatial position of the 3D effect, the focusing depth and convergence depth are inconsistent, thus causing visual fatigue.

[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. Summary of the Invention

[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] According to one aspect of this disclosure, a near-eye display system is provided, characterized in that it includes: a first image source, a second image source, a prism assembly, and a first focusing assembly; The prism assembly includes at least a first prism, a second prism, a first beam splitter, and a second beam splitter. The first prism and the second prism are bonded together. The first beam splitter is located between the bonding surfaces of the first prism and the second prism. Both the first beam splitter and the second beam splitter have partial reflection and partial transmission characteristics. The first light rays emitted from the first image source undergo total internal reflection of the first prism, reflection of the first beam splitter, and reflection of the second beam splitter before passing through the second prism and entering the human eye to form a first virtual image at a first position in the extension direction of the user's vision. The second light emitted from the second image source passes through the first focusing component and then enters the human eye through the prism component to form a second virtual image at a second position in the extension direction of the user's vision; the second position is different from the first position.

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

[0008] The embodiments disclosed herein include at least the following beneficial effects: The first light rays emitted from the first image source can be reflected by the internal total internal reflection of the first prism and the reflection of the first beam splitter and the second beam splitter before entering the human eye. By folding the transmission path of the first light rays multiple times, the near-eye display system can have a larger field of view while maintaining a small size design. In addition, the second light rays emitted from the second image source can be sequentially passed through the first focusing component and the prism component before entering the human eye. Based on the different positions of the first and second image sources in the extension direction of the user's vision, a first virtual image and a second virtual image are formed respectively. The first virtual image and the second virtual image are used to display near-distance 3D virtual images and far-distance 3D images respectively, which greatly improves the problem of inconsistent focusing depth and convergence depth, and reduces or even avoids causing visual fatigue to the user.

[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 of the optical path of a first ray provided by an embodiment of this disclosure is illustrated.

[0013] Figure 3 A schematic diagram of the optical path of a second ray provided by an embodiment of this disclosure is illustrated.

[0014] Figure 4 An example of another first ray optical path diagram provided by an embodiment of this disclosure is shown.

[0015] Figure 5 An example of another optical path diagram of a second ray provided by an embodiment of this disclosure is shown.

[0016] Figure 6A schematic diagram illustrating the imaging effect of a near-eye display system provided by an embodiment of this disclosure is shown.

[0017] Figure 7 A schematic diagram illustrating the structure of another near-eye display system provided in this disclosure is shown.

[0018] Figure 8 A schematic diagram of the optical path of yet another first ray provided by an embodiment of this disclosure is illustrated.

[0019] Figure 9 A schematic diagram of the optical path of yet another second ray provided by an embodiment of this disclosure is illustrated.

[0020] Figure 10 A schematic diagram of the optical path of another second ray provided in an embodiment of this disclosure is illustrated.

[0021] Figure label: 10. Near-eye display system; 20. Human eye; 11. First image source; 12. Second image source; 13. Prism assembly; 14. First focusing assembly; 15. Second focusing assembly; 16. Polarization modulation assembly; 17. First linear polarizer; 131. First prism; 132. Second prism; 133. Third prism; 134. First beam splitter; 135. Second beam splitter; 136. First quarter-wave plate; 161. Second quarter-wave plate; 162. Second linear polarizer. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 a first image source 11, a second image source 12, a prism assembly 13, and a first focusing assembly 14. The prism assembly 13 includes at least a first prism 131, a second prism 132, a first beam splitter 134, and a second beam splitter 135. The first prism 131 and the second prism 132 are bonded together. The first beam splitter 134 is located between the bonding surfaces of the first prism 131 and the second prism 132. Both the first beam splitter 134 and the second beam splitter 135 have partial reflection and partial transmission characteristics.

[0026] Among them, such as Figure 2 As shown, the first light rays emitted from the first image source 11, after being reflected by the internal total internal reflection of the first prism 131, the reflection of the first beam splitter 134, and the reflection of the second beam splitter 135, pass through the second prism 132 and enter the human eye 20 to form a first virtual image at a first position in the extension direction of the user's vision; as shown Figure 3 As shown, the second light emitted from the second image source 12 passes through the first focusing component 14 and then through the prism component 13 to enter the human eye 20, forming a second virtual image at a second position in the extension direction of the user's vision; the second position is different from the first position.

[0027] In this embodiment, the first light emitted from the first image source 11 can be reflected by the internal total internal reflection of the first prism 131 and the reflection of the first beam splitter 134 and the second beam splitter 135 within the prism assembly before entering the human eye 20. By folding the transmission path of the first light multiple times, the near-eye display system 10 has a larger field of view while ensuring a small volume design. In addition, the second light emitted from the second image source 12 can be sequentially passed through the first focusing assembly 14 and the prism assembly 13 before entering the human eye 20. Based on the different positions of the first image source 11 and the second image source 12 in the extension direction of the user's vision, a first virtual image and a second virtual image are formed respectively. Thus, the first virtual image and the second virtual image are used to display a near-distance 3D virtual image and a far-distance 3D image, respectively, which greatly improves the problem of inconsistent focusing depth and convergence depth and reduces or even avoids causing visual fatigue in the user.

[0028] The first image source 11 and the second image source 12 can have the same or different structures. Taking the first image source 11 as an example, it 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. Of course, the first image source 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.

[0029] Among them, such as Figure 2 or Figure 3 As shown, the first focusing component 14 is located on the light-emitting side of the second image source 12. The first focusing component 14 is used to adjust the imaging distance of the second virtual image formed by the second light ray emitted from the second image source 12, that is, to adjust the distance between the second virtual image and the human eye 20, so as to ensure that the first virtual image formed by the first light ray emitted from the first image source 11 and the second virtual image formed by the second light ray are located at different positions. In addition, the first focusing component 14 can be a lens component, such as a glass lens or other fixed focal length component, or a liquid lens, liquid crystal lens or other variable focal length component; it can also be a deformable mirror, diffractive optical element, etc., and the embodiments of this application are not limited in this respect.

[0030] For example, such as Figure 2 As shown in Figure 3, the first focusing assembly 14 includes a single lens to adjust the imaging distance of the second virtual image based on the single lens. Alternatively, the first focusing assembly 14 may also include a lens group composed of multiple lenses to adjust the imaging distance of the second virtual image based on the lens group composed of multiple lenses.

[0031] The lens included in the first focusing assembly 14 can be a convex lens or a concave lens; and when the first focusing assembly 14 includes multiple lenses, the multiple lenses can all be concave lenses, all be convex lenses, or a combination of convex lenses and concave lenses.

[0032] In addition, the lens included in the first focusing assembly 14 may be an optical plastic lens, an optical glass lens, etc.; or it may be a variable focus optical element or a liquid crystal lens, etc.; of course, when the first focusing assembly 14 includes multiple lenses, the first focusing assembly 14 may simultaneously include an optical plastic lens and / or an optical glass lens, as well as a variable focus optical element and / or a liquid crystal lens, etc.

[0033] When the first focusing component 14 includes at least a variable focus optical element or a liquid crystal lens, it is convenient to dynamically adjust the imaging distance of the second virtual image, thereby further improving the applicability of the near-eye display system 10 based on the adjustability of the imaging distance of the second virtual image.

[0034] In some implementations, such as Figure 4 or Figure 5 As shown, the near-eye display system 10 also includes a second focusing component 15, which is disposed on the light-emitting side of the first image source 11, that is, between the first image source 11 and the first surface of the first prism 131, and is used to adjust the imaging distance of the first virtual image, that is, to adjust the distance between the first virtual image and the human eye 20.

[0035] The specific structure of the second focusing component 15 can refer to the first focusing component 14 described above, as long as the first virtual image and the second virtual image are formed in different positions. For example, as shown... Figure 4 or Figure 5 As shown, the second focusing assembly 15 includes a lens to adjust the imaging distance of the first virtual image based on the lens.

[0036] In some implementations, such as Figure 6 As shown, the first virtual image and the second virtual image formed by the first light ray emitted from the first image source 11 and the second light ray emitted from the second image source 12 are located at different positions from the human eye 20. Specifically, the first virtual image may be located between the second virtual image and the human eye 20. For example, the first virtual image may be located 0.3 meters to 2 meters from the human eye, and the second virtual image may be located 2 meters to infinity from the human eye. That is, the distance between the first virtual image and the human eye 20 is greater than or equal to 0.3 meters and less than or equal to 2 meters, and the distance between the second virtual image and the human eye 20 is greater than or equal to 2 meters. Alternatively, the second virtual image may be located between the first virtual image and the human eye 20. For example, the first virtual image may be located 2 meters to infinity from the human eye, and the second virtual image may be located 0.3 meters to 2 meters from the human eye. That is, the distance between the first virtual image and the human eye 20 is greater than or equal to 2 meters, and the distance between the second virtual image and the human eye 20 is greater than or equal to 0.3 meters and less than or equal to 2 meters.

[0037] Of course, in combination with the first focusing component 14 and the second focusing component 15 described above, the imaging distance of the first virtual image can also be adjusted to be less than 0.3 meters or greater than 2 meters, and the imaging distance of the second virtual image can be greater than the imaging distance of the first virtual image but less than 2 meters; or the imaging distance of the first virtual image can be adjusted to be less than 2 meters, and the imaging distance of the second virtual image can be less than the imaging distance of the first virtual image but less than 0.3 meters or greater than 2 meters. This disclosure does not limit this aspect.

[0038] In the embodiments of this disclosure, such as Figures 2-5 As shown in any one of them, the prism assembly 13 includes a first prism 131, a second prism 132, a first beam splitter 134, and a second beam splitter 135.

[0039] The first prism 131 and the second prism 132 are both prism-shaped structures. The first prism 131 is located on the light-emitting side of the first image source 11 and has a first surface facing the first image source 11, which is the optical surface of the first prism 131 facing the first image source 11. The first prism 131 also has a second surface that performs internal total internal reflection on the first light entering the first prism 131. The second surface of the first prism 131 is the optical surface of the first prism 131 facing away from the human eye 20. The first prism 131 also has a mating surface that fits with the second prism 132, which is the optical surface of the first prism 131 facing the second prism 132. The second prism 132 has a mating surface that fits with the first prism 131, which is the optical surface of the second prism 132 facing the first prism 131. The second prism 132 also has an exit surface facing the human eye 20.

[0040] The first beam splitter 134 is located between the mating surface of the first prism 131 and the mating surface of the second prism 132, and the second beam splitter 135 is located on the side of the first prism 131 closer to the second surface.

[0041] In some implementations, such as Figures 2-5 As shown in any one of them, the prism assembly 13 also includes a third prism 133, which is located on the side of the first prism 131 near the second surface. At this time, the second beam splitter 135 is located on the side of the third prism 133 near or away from the first prism 131.

[0042] Among them, the third prism 133 is a concave or convex mirror structure, and as... Figure 7 As shown, when the third prism 133 is a concave mirror, the second beam splitter 135 is fixed on the surface of the third prism 133 facing the first prism 131; as Figure 4 or Figure 5As shown, when the third prism 133 is a convex mirror, the second beam splitter 135 is fixed on the surface of the third prism 133 facing away from the first prism 131. Furthermore, regarding the transmission of the first light ray, when the third prism 133 is a concave mirror, the first light ray reflected by the first beam splitter 134, after passing through the second surface of the first prism 131, will be directly reflected by the second beam splitter 135 and will not enter the third prism 133; however, when the third prism 133 is a convex mirror, the first light ray reflected by the first beam splitter 134, after passing through the second surface of the first prism 131, will enter the third prism 133 and then be reflected by the second beam splitter 135.

[0043] In some implementations, such as Figure 1 or Figure 7 As shown, the third prism 133 is arranged opposite to the second surface of the first prism 131 to form an air gap between them, which is used to achieve total internal reflection of the second surface of the first prism 131.

[0044] In this way, based on the air gap between the first prism 131 and the third prism 133, the second surface of the first prism 131 can form an interface between an optically denser medium and an optically less dense medium, thereby ensuring that the first light rays entering the first prism 131 along the first surface of the first prism 131 can undergo total internal reflection at the second surface of the first prism 131.

[0045] Of course, for the first light ray entering the first prism 131, in addition to achieving total internal reflection on the second surface of the first prism 131 based on the air gap, the second surface of the first prism 131 can also have a semi-transparent and semi-reflective film, a polarizing beam splitter, etc., to achieve reflection of the first light ray on the second surface of the first prism 131 based on the semi-transparent and semi-reflective film or the polarizing beam splitter. The aforementioned air gap not only simplifies the structural composition of the prism assembly 13 but also ensures the reflection efficiency of the first light ray on the second surface of the first prism 131.

[0046] In some embodiments, the minimum thickness of the air gap between the first prism 131 and the third prism 133 is greater than or equal to 0.01 mm.

[0047] Thus, by limiting the minimum thickness of the air gap between the first prism 131 and the third prism 133, the complete separation between the second surface of the third prism 133 and the first prism 131 is ensured, thereby guaranteeing the reliability of total internal reflection of the first light entering the first prism 131 on the second surface of the first prism 131.

[0048] For example, the minimum thickness of the air gap between the second surface of the first prism 131 and the third prism 133 is 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, etc.

[0049] In some embodiments, the angle between the principal optical axis of the first surface of the first prism 131 and the normal of the second surface of the first prism 131 is greater than or equal to 35 degrees and less than or equal to 75 degrees.

[0050] Thus, by limiting the angle between the principal optical axis of the first surface of the first prism 131 and the normal of the second surface, it is ensured that the incident angle of the first ray entering the first prism 131 on the second surface is greater than the critical angle, thereby ensuring that the first ray can undergo total internal reflection on the second surface of the first prism 131; at the same time, it avoids that the incident angle of the first ray on the second surface is too large, causing the first ray reflected by the second beam splitter 135 to fail to form an image at the focal position of the human eye 20, thereby affecting the viewing effect of the human eye 20.

[0051] For example, the angle between the principal optical axis of the first surface of the first prism 131 and the normal of the second surface of the first prism 131 is 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, etc.

[0052] The first surface of the first prism 131 can be a plane or a curved surface (such as a spherical or non-spherical surface). When the first surface of the first prism 131 is curved, the entire area of ​​the first surface of the first prism 131 can be curved, or only the area of ​​the first surface of the first prism 131 facing the first image source 11 can be curved. The curved surface on the first surface of the first prism 131 can be a convex surface facing the first image source 11 or a concave surface facing the first image source 11, depending on the first light ray entering the first prism 131.

[0053] For example, in conjunction with the above description, when the second focusing component 15 is provided on the light-emitting side of the first image source 11, the first surface of the first prism 131 is a curved surface that convexes toward the first image source 11.

[0054] In some embodiments, the mating surfaces of the first prism 131 and the second prism 132 are both planes, and the angle between the mating surface of the first prism 131 and the second surface of the first prism 131 is greater than or equal to 20 degrees and less than or equal to 35 degrees.

[0055] Thus, by limiting the angle between the third surface and the second surface of the first prism 131, it is ensured that the first light rays reflected by the first beam splitter 134 can be transmitted in a direction approximately parallel to the visual axis of the human eye 20. This reduces or even eliminates the refraction of the first light rays on the second surface of the first prism 131 while transmitting the first light rays through it, thereby ensuring the imaging quality of the first virtual image formed by the first light rays reflected by the second beam splitter 135.

[0056] For example, the angle between the third surface of the first prism 131 and the second surface of the first prism 131 is 20 degrees, 23 degrees, 26 degrees, 29 degrees, 32 degrees, 35 degrees, etc.

[0057] In some embodiments, the exit surface of the second prism 132 is arranged parallel to the second surface of the first prism 131.

[0058] Thus, based on the parallel exit surface and the second surface, the first prism 131 and the second prism 132 form an approximately plane mirror structure to ensure the consistency of the optical axis of the system, thereby ensuring the imaging stability of the first virtual image and the second virtual image formed by the first light ray and the second light ray transmitted through the first prism 131 and the second prism 132.

[0059] In some embodiments, the first beam splitter 134 is a polarization beam splitter, such that when light is incident on the polarization beam splitter, the first polarized light component having a first directional polarization state passes through the polarization beam splitter and exits from the transmission side, while the second polarized light component having a second directional polarization state is reflected by the polarization beam splitter, and the first direction and the second direction intersect.

[0060] In this way, based on the setting of the polarization beam splitter, the first beam splitter 134 can be guaranteed to have the characteristics of partial reflection and partial transmission, thereby ensuring that the first light rays that are totally reflected by the second surface of the first prism 131 can be reflected by the first beam splitter 134, while the first light rays reflected by the second beam splitter 135 and the second light rays that pass through the first focusing assembly 14 can be transmitted through the first beam splitter 134.

[0061] In one configuration, the transmission axis of the polarizing beam splitter is parallel to the horizontal direction. In this configuration, the polarizing beam splitter can transmit horizontally polarized light (i.e., horizontally polarized light, P-polarized light) and reflect vertically polarized light (i.e., vertically polarized light, S-polarized light). Alternatively, the transmission axis of the polarizing beam splitter is parallel to the vertical direction. In this configuration, the polarizing beam splitter can transmit vertically polarized light (i.e., vertically polarized light, S-polarized light) and reflect horizontally polarized light (i.e., horizontally polarized light, P-polarized light).

[0062] For example, the transmission axis of the polarizing beam splitter is parallel to the horizontal direction, such as... Figure 2 or Figure 4 As shown, assuming the first light emitted from the first image source 11 is S-polarized light, the first light emitted by the first light source 11, after total internal reflection by the second surface of the first prism 131 to the polarization beam splitter, is S-polarized light. This allows the polarization beam splitter to reflect the first light (S-polarized light) again. The first light reflected by the polarization beam splitter is then modulated into P-polarized light after reflection by the second beam splitter 135, ensuring that the first light (P-polarized light) reflected by the second beam splitter 135 can sequentially pass through the first prism 131, the polarization beam splitter, and the second prism 132. Similarly, as... Figure 3 or Figure 5 As shown, assuming the second light source provided by the second image source 12 is P-polarized light, the second light source passing through the first focusing component 14 can sequentially transmit through the third prism 133, the first prism 131, the polarizing beam splitter, and the second prism 132.

[0063] When the first beam splitter 134 is a polarization beam splitter, the first light emitted by the first image source 11 can be polarized light (such as circularly polarized light, linearly polarized light, etc.) or unpolarized light.

[0064] When the first light emitted by the first image source 11 is linearly polarized light, the vibration direction of the first light is perpendicular to the transmission axis of the polarizing beam splitter. This ensures that the first light emitted by the first image source 11, after total internal reflection by the second surface of the first prism 131, can be reflected again by the polarizing beam splitter, and that the first light reflected by the second beam splitter 135 can pass through the polarizing beam splitter. For example, as... Figure 2 or Figure 4 As shown, the first light provided by the first image source 11 is S-polarized light (vertically polarized light), and the transmission axis of the polarization beam splitter is horizontal. At this time, the polarization beam splitter can reflect the first light (S-polarized light) emitted by the first image source 11 and after total reflection by the second surface of the first prism 131, and the first light reflected by the second beam splitter 135 is P-polarized light (horizontally polarized light), thereby ensuring that it can pass through the polarization beam splitter and enter the human eye 20.

[0065] When the first light source 11 provides unpolarized light, it can be as follows: Figure 8 As shown, the near-eye display system 10 also includes a first linear polarizer 17, which is disposed between the first image source 11 and the first surface of the first prism 131. The first linear polarizer 17 modulates the first light emitted from the first image source 11 into linearly polarized light, so that the first light provided by the first image source 11 undergoes total internal reflection at the second surface of the first prism 131 and is then completely reflected by the polarizing beam splitter. This prevents at least a portion of the first light after total internal reflection at the second surface of the first prism 131 from passing through the polarizing beam splitter, thereby avoiding stray light that could affect image quality. For example, as... Figure 8 As shown, the first light emitted from the first image source 11 can be modulated into S-polarized light by the first linear polarizer 17. The transmission axis of the polarizing beam splitter is horizontal. At this time, the polarizing beam splitter can reflect the first light (S-polarized light) after it has been modulated by the first linear polarizer 17 and totally reflected by the second surface of the first prism 131. The first light reflected by the second beam splitter 135 is P-polarized light (horizontally polarized light), thus ensuring that it can pass through the polarizing beam splitter and enter the human eye 20.

[0066] In some embodiments, the second beam splitter 135 is a semi-transparent and semi-reflective film with a reflectivity of 5% to 90%.

[0067] In this way, based on the setting of the semi-transparent and semi-reflective film, the second beam splitter 135 can be guaranteed to have the characteristics of partial reflection and partial transmission, thereby ensuring that the first light reflected by the first beam splitter 134 can be reflected by the second beam splitter 135; at the same time, the second light transmitted through the first lens group can be transmitted through the second beam splitter 135.

[0068] For example, the reflectivity of the second beam splitter 135 is greater than or equal to 5% and less than or equal to 90%. For example, the reflectivity of the second beam splitter 135 is 5%, 10%, 20%, 30%, 50%, 70%, 90%, etc.

[0069] In the case where the second beam splitter 135 is a semi-transparent and semi-reflective film, in order to ensure that the first light reflected by the second beam splitter 135 can be transmitted by the first beam splitter 134, in combination with the case where the first beam splitter 134 is a polarization beam splitter, the prism assembly 13 also includes a polarization modulation device, which is located on the side of the second beam splitter 135 close to the first prism 131.

[0070] For example, such as Figure 8 As shown, the prism assembly 13 further includes a first quarter-wave plate 136 (polarization modulation device) disposed between the second surface of the first prism 131 and the second beam splitter 135.

[0071] Thus, based on the setting of the first quarter-wave plate 136, the first light ray reflected by the first beam splitter 134 passes through the first quarter-wave plate 136 for the first time, and then passes through the first quarter-wave plate 136 for the second time after being reflected by the second beam splitter 135. In this way, the first light ray reflected by the first beam splitter 134 is adjusted to be able to transmit through the first beam splitter 134 based on the quarter-wave plate.

[0072] The fast axis of the first quarter-wave plate 136 is at an angle of 45 ± 5 degrees to the vibration direction of the first light reflected by the first beam splitter 134. This ensures that after the first light reflected by the first beam splitter 134 is modulated twice by the first quarter-wave plate 136, the vibration direction of the first light returning to the first beam splitter 134 is parallel to the transmission axis of the first beam splitter 134, thereby ensuring that the modulated first light can be transmitted through the first beam splitter 134.

[0073] For example, in conjunction with the above description, the first light reflected by the first beam splitter 134 (polarizing beam splitter) is S-polarized light, and the optical axis of the first quarter-wave plate 136 is at a 45-degree angle to the vibration direction of the first light (S-polarized light). At this time, the first light after being modulated for the first time by the first quarter-wave plate 136 is either left-handed or right-handed polarized light. The rotation direction of the first light reflected by the second beam splitter 135 is opposite to the rotation direction of the first light after the first modulation. Therefore, the first light after being modulated for the second time by the first quarter-wave plate 136 is P-polarized light, so as to ensure that the first light after the second modulation can be transmitted through the first beam splitter 134.

[0074] In some implementations, such as Figure 9 or Figure 10 As shown, the near-eye display system 10 also includes a polarization modulation component 16, which is disposed on the side of the first focusing component 14 that is close to or far from the second image source 12.

[0075] The polarization modulation component 16 includes a second quarter-wave plate 161, which can modulate the polarization state of the second light emitted from the second image source 12 to ensure that the second light emitted from the second image source 12 can be transmitted through the first beam splitter 134 after passing through the first focusing component 14 and the second quarter-wave plate 161.

[0076] Among them, such as Figure 9 As shown, the second quarter-wave plate 161 is located between the second image source 12 and the first focusing assembly 14, or as... Figure 10 As shown, the second quarter-wave plate 161 is located between the third prism 133 and the first focusing assembly 14. Of course, when the first focusing assembly 14 includes multiple lenses, the second quarter-wave plate 161 can also be located between any two lenses.

[0077] In conjunction with the prism assembly 13 described above, which includes a first quarter-wave plate 136, the second light provided by the second image source 12 can first be adjusted to circularly polarized light by the second quarter-wave plate 161, and then adjusted to linearly polarized light by the first quarter-wave plate 136, thereby ensuring that the second light transmitted through the first quarter-wave plate 136 can be transmitted through the polarization beam splitter (first beam splitter 134).

[0078] For example, the second light emitted from the second image source 12 is P-polarized light before being modulated by the second quarter-wave plate 161. The transmission axis of the polarization beam splitter is horizontal. At this time, the second light is still P-polarized light after being modulated by the second quarter-wave plate 161 and the first quarter-wave plate 136 in sequence, thereby ensuring that the second light transmitted through the first quarter-wave plate 136 can be transmitted through the polarization beam splitter.

[0079] Furthermore, the second light emitted by the second image source 12 can be polarized light (such as circularly polarized light, linearly polarized light, etc.) or unpolarized light.

[0080] When the second light emitted by the second image source 12 is linearly polarized light, the vibration direction of the second light is parallel to the transmission axis of the polarization beam splitter (first beam splitter 134) to ensure that the second light emitted by the second image source 12 can pass through the polarization beam splitter after being modulated by the second quarter-wave plate 161 and the first quarter-wave plate 136.

[0081] When the second light source 12 provides unpolarized light, it can be as follows: Figure 9 or Figure 10 As shown, the polarization modulation assembly 16 further includes a second linear polarizer 162, which is disposed on the light-emitting side of the second image source 12. The second linear polarizer 162 is used to modulate the second light emitted from the second image source 12 into linearly polarized light, so that the second light emitted from the second image source 12 can be transmitted through the polarization beam splitter after being modulated by the second linear polarizer 162, the second quarter-wave plate 161, and the first quarter-wave plate 136.

[0082] Among them, such as Figure 9 As shown, the second linear polarizer 162 and the second quarter-wave plate 161 are both located between the second image source 12 and the first focusing assembly 14, or as... Figure 10 As shown, the second linear polarizer 162 and the second quarter-wave plate 161 are both located between the third prism 133 and the first focusing assembly 14. Alternatively, the second linear polarizer 162 can be located between the second image source 12 and the first focusing assembly 14, and the second quarter-wave plate 161 can be located between the third prism 133 and the first focusing assembly 14.

[0083] Furthermore, the angle between the fast axis of the second quarter-wave plate 161 and the extinction axis of the second linear polarizer 162 is 45 degrees ± 5 degrees. This ensures that the second light emitted from the second image source 12, after passing through the second linear polarizer 162, can be modulated into circularly polarized light or approximately circularly polarized light by the second quarter-wave plate 161, and then restored to linearly polarized light by the first quarter-wave plate 136, thus guaranteeing the transmittance of the second light. For example, the angle between the fast axis of the second quarter-wave plate 161 and the extinction axis of the second linear polarizer 162 is 40 degrees, 42 degrees, 44 degrees, 45 degrees, 46 degrees, 48 ​​degrees, 50 degrees, etc.

[0084] This disclosure also provides a near-eye display device, which includes the near-eye display system 10 described in the above embodiments.

[0085] 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.

[0086] In addition to the near-eye display system 10, the near-eye display device necessarily 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.

[0087] 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 by, The application relates to a prism assembly and a first focusing assembly. The prism assembly (13) comprises a first prism (131), a second prism (132), a first light splitter (134) and a second light splitter (135), the first prism (131) and the second prism (132) are attached to each other, the first light splitter (134) is located between the attached surfaces of the first prism (131) and the second prism (132), and the first light splitter (134) and the second light splitter (135) both have partial reflection and partial transmission characteristics. The first light emitted by the first image source (11) is internally totally reflected by the first prism (131), reflected by the first light splitter (134), reflected by the second light splitter (135), and then transmitted through the second prism (132) to enter the human eye (20), so as to form a first virtual image at a first position in the extension direction of the user's vision. The second light emitted by the second image source (12) is transmitted through the prism assembly (13) to enter the human eye (20) after passing through the first focusing assembly (14), so as to form a second virtual image at a second position in the extension direction of the user's vision, and the second position is different from the first position. The prism assembly (13) further comprises a third prism (133).

2. The near-eye display system (10) of claim 1, wherein, The first prism (131) has a second surface for totally reflecting the first light, the third prism (133) is located on the side of the first prism (131) close to the second surface, and the second light splitter (135) is located on the side of the third prism (133) close to or away from the first prism (131). The third prism (133) is arranged opposite to the second surface of the first prism (131) to form an air gap therebetween, so as to realize total reflection of the second surface of the first prism (131).

3. The near-eye display system (10) of claim 2, wherein, The minimum thickness of the air gap is greater than or equal to 0.01 mm.

4. The near-eye display system of claim 3, wherein, The first prism (131) is located on the light-emitting side of the first image source (11) and has a first surface facing the first image source (11).

5. The near-eye display system (10) of claim 3, wherein, The first surface is a curved surface, and the included angle between the principal axis of the first surface of the first prism (131) and the normal line of the second surface of the first prism (131) is greater than or equal to 35 degrees and less than or equal to 75 degrees. The attached surfaces of the first prism (131) and the second prism (132) are both flat surfaces, and the included angle between the attached surface of the first prism (131) and the second surface of the first prism (131) is greater than or equal to 20 degrees and less than or equal to 35 degrees.

6. The near-eye display system (10) of claim 3, wherein, The second prism (132) has an exit surface facing the human eye (20), and the exit surface of the second prism (132) is arranged in parallel with the second surface of the first prism (131).

7. The near-eye display system (10) of claim 2, wherein, ​ 8. The near-eye display system (10) of any one of claims 1 to 7, wherein, The first beam splitter (134) is a polarization beam splitter, such that when a first light ray is incident to the polarization beam splitter, a first polarization light component having a first direction polarization state passes through the polarization beam splitter and is emitted from a transmission side, while a second polarization light component having a second direction polarization state is reflected by the polarization beam splitter, the first direction intersecting the second direction.

9. The near-eye display system (10) of claim 8, wherein, The second beam splitter (135) is a semi-transmissive semi-reflective film, and a reflectivity of the semi-transmissive semi-reflective film is 5% to 90%.

10. The near-eye display system (10) of claim 9, wherein, The prism assembly (13) further comprises a first quarter wave plate (136) disposed between a second surface of the first prism (131) and the second beam splitter (135).

11. The near-eye display system (10) of claim 8, wherein, The near-eye display system (10) further comprises a first linear polarizer (17) disposed between the first image source (11) and the first prism (131).

12. The near-eye display system (10) of any one of claims 1 to 7, wherein, The near-eye display system (10) further comprises a polarization modulation assembly (16), the polarization modulation assembly (16) comprising a second quarter wave plate (161) and a second linear polarizer (162). The first focusing assembly (14) is located on an emission side of the second image source (12), and the polarization modulation assembly (16) is disposed on a side of the first focusing assembly (14) close to or away from the second image source (12).

13. The near-eye display system (10) of claim 12, wherein, An angle between a fast axis of the second quarter wave plate (161) and an extinction axis of the second linear polarizer (162) is 45 degrees ± 5 degrees.

14. The near-eye display system (10) of any one of claims 1 to 7, wherein, The near-eye display system (10) further comprises a second focusing assembly (15) disposed on an emission side of the first image source (11) and configured to adjust an imaging distance of the first virtual image.

15. The near-eye display system (10) of any one of claims 1 to 7, wherein, The first focusing assembly (14) comprises a lens configured to adjust an imaging distance of the second virtual image.

16. The near-eye display system of any one of claims 1 to 6, wherein, The first focusing assembly (14) comprises a lens group comprising a plurality of lenses.

17. The near-eye display system of any one of claims 1 to 6, wherein, The first focusing assembly (14) comprises a variable focus optical element or a liquid crystal lens configured to dynamically adjust an imaging distance of the second virtual image.

18. The near-eye display system (10) of any one of claims 1 to 6, wherein, The first virtual image is located at a distance of 0.3 meters to 2 meters from the human eye (20), and the second virtual image is located at a distance of 2 meters to infinity from the human eye (20).

19. A near-eye display device, comprising: The near-eye display system (10) comprises the near-eye display system (10) of any one of claims 1-18.

20. The near-eye display device of claim 19, wherein, The near-eye display device is an augmented reality glasses or a head-mounted display or a mixed reality glasses.

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