Novel near-eye display optical system

Abstract

A near-eye display optical system may include a lens that extends along an optical axis and has (a) an input plane and (b) first and second major surfaces that generally extend along the optical axis, the lens being configured to receive collimated light to an image via the input plane, the lens comprising a set of partially reflective internal surfaces disposed along the optical axis at an angle to the optical axis, the first partially reflective internal surface from the set having a partial reflectivity such that at least a portion of the collimated light is reflected from the lens by the first partially reflective internal surface without being pre-reflected from the first or second major surfaces.

Description

Technical Field

[0001] The present disclosure relates to the field of near-eye display optical systems such as head-mounted displays. More specifically, the present disclosure relates to near-eye display optical systems that potentially have no waveguides.

Background Art

[0002] Consumer demand for improved human-computer interfaces has increased interest in high-quality head-mounted displays (HMDs), or near-eye displays widely known as smart glasses. These devices can provide virtual reality (VR) or augmented reality (AR) experiences and improve the way users interact with digital content and the surrounding environment.

[0003] When using an HMD, consumers seek better image quality, an immersive experience, and greater comfort. Consumers expect a display that is high-resolution, vividly colored, and minimally distorted, creating a realistic and enjoyable viewing experience. Additionally, comfort is a critical factor as users often wear these devices for extended periods. Consumers desire a lightweight and sleek design that is not overly intrusive when worn in various scenarios and is more convenient. Moreover, by miniaturizing the device, portability is improved, making it easier to carry and use in different environments. Therefore, there is a growing demand for higher-performance yet smaller and more compact HMDs.

[0004] An important element of conventional near-eye display systems is the waveguide. It is a device that guides light from the system image projector to the user's eye. The waveguide propagates light relying on total internal reflection along the main surfaces within the device. To achieve optimal waveguide performance, high-precision design and manufacturing are required to prevent defects that may degrade the user's visual experience. This process of designing and manufacturing the waveguide is time-consuming and costly, thus hindering the availability and adoption of near-eye display systems. Furthermore, there are inherent limitations to the miniaturization of waveguides, which restricts the miniaturization of head-mounted displays (HMDs). SUMMARY OF THE INVENTION

[0005] The present disclosure presents an enhanced optical system for near-eye displays that has minimal requirements for one of its main components, the lens, and is easy and convenient to construct. This innovative optical system for near-eye displays is capable of providing performance comparable to or exceeding that of conventional systems without the need to incorporate a waveguide as part of the entire setup.

[0006] The present disclosure introduces a novel optical system for near-eye displays that utilizes a series of parallel partial reflection surfaces. This approach is similar to the light guide optical element (LOE) described in U.S. Patent No. 7,643,214 and U.S. Patent No. 7,724,442. The LOE incorporates a lens that functions as a light-transmissive substrate having two parallel main surfaces. Light is guided between these surfaces by an optical element that achieves total internal reflection or a dielectric coating that captures light. Furthermore, the LOE incorporates a plurality of partial reflection surfaces that are non-parallel to the main surfaces, facilitating the coupling of light to the user's eye.

[0007] In contrast, the new optical system for near-eye displays of the present disclosure employs a set of parallel partial reflection surfaces and does not rely on waveguide through internal reflection of the main surface. As a result, the near-eye display optical system incorporated herein is significantly simpler in construction compared to the aforementioned LOE. Also, there are fewer strict requirements imposed on the main surface of the lens.

[0008] The accompanying drawings, which are incorporated herein and constitute a part hereof, illustrate various exemplary systems, methods, etc. of various embodiments of aspects of the present invention. It is understood that the element boundaries shown in the figures (e.g., boxes, groups of boxes, or other shapes) represent an example of the boundary. As will be appreciated by those skilled in the art, one element can be designed as multiple elements, or multiple elements can be designed as one element. An element shown as an internal component of another element can be implemented as an external component, and vice versa. Further, the elements may not be drawn to exact scale.

Brief Description of the Drawings

[0009]

Figure 1A

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DETAILED DESCRIPTION OF THE INVENTION

[0010] According to an embodiment of the present invention, for example, for the purpose of a near-eye display (which may be a virtual reality or augmented reality display) widely known as a head-mounted display (HMD) or smart glasses, a light projection system and an optical system for achieving optical aperture expansion are provided. The consumer demand for a better and more comfortable human-computer interface has stimulated the demand for better image quality and smaller devices.

[0011] FIG. 1A shows an exemplary implementation of a near-eye display device 10. The near-eye display device 10 is proposed here merely as an example, and the technology of the present invention disclosed in this specification is not limited to such a device.

[0012] In the illustrated embodiment of FIG. 1A, the near-eye display 10 uses a compact image projector or projection unit 104 optically coupled to inject an image into the optical element 102. The optical aperture expansion of the light from the projection unit 104 can be achieved within the optical element 102 by one or more configurations for gradually redirecting the image illumination, using a set of partially reflective surfaces (synonymously referred to as "facets") that are parallel to each other and inclined obliquely with respect to the propagation direction of the image light, and each successive facet deflects a portion of the image light in the deflection direction. The partially reflective facets can also function as a coupling-out configuration that gradually couples a portion of the image illumination toward the observer's eye located within a region defined as the eye movement box (EMB).

[0013] The overall device 10 is preferably supported relative to the user's head with each projection unit 104 and optical element 102 providing for the user's corresponding eye. In one particularly preferred option as shown here, the support configuration is a face-mounted lens set (e.g., prescription lenses, sunglasses, etc., colloquially referred to herein as "eyeglasses") having a lens 108 to which the projection unit 104 and optical element 102 are optically connected, and a frame having a side portion 101 for supporting the device relative to the user's ear. Other forms of support arrangements can also be used, including, without limitation, devices suspended from a headband, visor, or helmet.

[0014] The near-eye display 10 can include various additional components, typically powered by a small onboard battery (not shown) or some other suitable power source, and typically including a controller 121 for operating the projection unit 104. The controller 121 can include all necessary electronic components, such as, for example, at least one processor or processing circuit, to drive the image projector 104.

[0015] Figures 1B and 1C are schematic views of a monocular portion of the near-eye display optical system 100. System 100 is similar to system 10 of Figure 1A, with the main exception that in the near-eye display optical system 100, the projection unit 104 is disposed on top of the optical element 102 (hereinafter also referred to as lens 102) instead of on the side of the optical element 102 as shown in Figure 1A. Figure 1B is a side view (along the YZ plane), and Figure 1C is a front view of the near-eye display optical system 100 (along the XY plane).

[0016] The lens 102 is positioned in front of the user's eye movement box (EMB) 112 so as to direct the light projected from the projection unit 104 towards the EMB 112. As shown, the projection unit 104 can be positioned either above or below the lens 102. Unlike the waveguide, the lens 102 guides light from the projection unit 104 to the EMB 112 without relying on total internal reflection from the main surface of the optical element.

[0017] The lens 102 has two regions, namely, a first region 114 that does not guide or reflect light, and a second region 116 that has a plurality of partially reflective internal surfaces 118, and can form a folded beam splitter (FBS) for expanding the image aperture. The projection unit 104 projects light (microdisplay image) onto the second region 116 of the lens 102, and the lens 102 reflects the light towards the center of the EMB 112 through the set of internal surfaces 118. The projected light is collimated or substantially collimated along the arrangement axis α of the lens 102. The arrangement axis α is defined herein as the axis along which the internal surfaces 118 are disposed or arranged.

[0018] System 100 may also include two external lenses (a first external lens 106 and a second external lens 108) and a shutter 110. The first external lens 106 and the second external lens 108 can be attached to the main lens 102 together with the shutter 110. They can help change the focal planes of both projection light and landscape light. The inner surface of the first external lens 106 changes the focal plane of the projected image and the landscape image, and the inner surface of the second external lens 108 changes the focus of the landscape image. The shutter 110 positioned between the main lens 102 and the second external lens 108 can control the luminance of the landscape image. To ensure a smooth appearance, a gradually spatially varying coating can be applied to the lens 102 between the first region 114 and the second region 116.

[0019] The optical shutter 110 can incorporate a polarizer that allows only P-polarized light from the landscape to pass through the lens 102 and the partially reflective surface 118 towards the user's eye. The coating on the partially reflective surface 118 can have a low reflectivity for P-polarized light and a high reflectivity for S-polarized light. The first external lens 106 can be directly attached to the main lens 102 at its main surface 140. The optical shutter 110 can be divided into a plurality of independently controllable pixels and is designed to control the luminance of the landscape image using technologies such as polarizers and controllable liquid crystal cells (LCCs). The shuttering can be limited to covering the entire lens 102 or only overlapping the second region 116, and as shown in FIG. 1B, it affects the luminance of the field overlapping the projected field of view (FOV).

[0020] Figures 2A and 2B show the optical path of light for the system 100.

[0021] Figure 2A shows the optical paths of three different light rays. In Figure 2A, the lens 102 of FIGS. 1B - 1C is shown. The projection unit 104 is not shown, but the coupling surface 142 between the lens 102 and the projection unit 104 is shown. The figure shows three light rays: a first light ray 202, a second light ray 204, and a third light ray 206 that are coupled to the lens 102 and reflected towards the fixed center 208 of the user. The fixed center 208 of the user is positioned at a predefined distance from the human eye, for example, approximately 11 mm behind the human eye 112.

[0022] In the figure, the first light ray 202A propagates through a plurality of surfaces 118 until it reaches the surface 118b where it is reflected, for example, until the light ray 202B that is reflected towards the user's eye. As can be seen in the figure, the light ray 202A has the longest path for propagating towards the fixed center 208 of the user before it is reflected, for example, before the light ray 202B. The second light ray 204A propagates through four surfaces 118 before reaching and being reflected, for example, before the light ray 204B that is reflected towards the fixed center 208 of the user by the surface 118g. The closest light ray, the third light ray 206A, propagates through a single surface, through the surface 118n, before being reflected, for example, before the light ray 206B that is reflected towards the fixed center 208 of the user by the surface 118i.

[0023] In order for all the reflected light rays 202B, 204B, and 206B to have the same intensity, the reflectivity increases as the surface is positioned further away from the projection unit 104. For example, the surface 118n has a lower reflectivity than the surfaces 118a and 118b.

[0024] According to some embodiments of the present invention, the spacing between the reflective surfaces 118 varies and the space is set to induce a uniform intensity distribution of all the fields in the EMB 112.

[0025] FIG. 2B shows the beam paths of three different beams. The figure shows three beams, a first beam 210, a second beam 212, and a third beam 214, including the three light rays shown in FIG. 2A, namely light rays 202A and B, 204A and B, and 206A and B. Each of the first beam 210, the second beam 212, and the third beam 214 is substantially continuous and has no or very few regions where the light rays do not fill the aperture of a particular beam field. The figure also shows a coupling surface 142 between the lens 102 and the projection unit 104.

[0026] According to some embodiments of the present invention, the angles of the coupling surface 142 with respect to the lens 102 are set to reduce chromatic aberration and other keystone effects caused by propagation through a high refractive index material, where the coupling in angle and the coupling out angle of the angles are not equal (wedge effect). When the surface of the FBS lens 102 is set at an angle θ with respect to the normal to the main surface of the lens 102, the surface 142 should be rotated with respect to the main surface. For example, when θ = 45°, the surface 142 can be rotated 90° with respect to the main surface of the lens 102.

[0027] According to some embodiments of the present invention, in order to make the lens as compact as possible, the most extreme light rays can propagate relatively parallel (about 90° with respect to the normal to the main surface) with respect to the main surface of the lens 102 within the lens 102, reducing the lens width. All other fields may propagate at an angle greater than 90°.

[0028] According to some embodiments of the present invention, in order to minimize the width of the surface 142, it should be positioned as close as possible to the outer surface 138, as can be shown in FIG. 2B.

[0029] According to some embodiments of the present invention, the light projected from the projection unit 104 onto the lens 102 can be reflected from the main surfaces of both the surface 140 of the external lens 106 and the surface 138 of the external lens 108. However, in certain cases where the light propagates at an angle of 90° or more, the light injected through the surface 142 may not hit the external surface 138 of the external lens 108.

[0030] Unwanted reflections (ghost images) can be caused through the surface 140. Therefore, in order to eliminate unwanted reflections, the adhesive used between the lens 102 and the external lens 106 may have the same RI (refractive index), and the coating should not be used on the surface 140 of the external lens 106. If such requirements cannot be met, unwanted reflections (shown in FIG. 3A) may occur.

[0031] FIG. 3A shows a case of unwanted reflection (ghost image) caused inside the disclosed lens. As can be seen in the figure, the light ray 302A is reflected at the surface 140 as an unwanted reflection, the light ray 302B. It should be noted that this unwanted reflection comes from a direction outside the FOV of the light ray 302C, and light from the scenery can reach the EMB 112 from this direction without propagating through the shutter 110. Therefore, the relative brightness of the light ray 302B with respect to the light ray 302C may be much lower than the relative brightness of the light within the FOV of the image.

[0032] FIG. 3B shows an improved system that improves the ghost effect. The figure shows a lens 310 having an active area (i.e., an area incorporating a partial reflection surface) inclined with respect to the lens structure. The active area of the surface 118 positioned further away from the input plane, for example, the surface 142, for example, the surfaces 118a and 118b, is close to the surface 138, but the active area of the surface close to the input plane, the surface 142, for example, the surfaces 118i and 118n, is close to the surface 308. Therefore, the coated active area of the surface can be inclined with respect to the main lens structure, as shown in FIG. 3B.

[0033] Thus, only light that is very far from the FOV field can be reflected by the EMB112. This can be achieved by selectively coating different regions of different plates when fabricating the lens 102, or by bonding two parts together with the surface 306 therebetween (however, since the illumination surface 306 has a lower angle of incidence (AOI) with respect to the surface 308, the need to match the RI is lower). FIG. 3B shows such an exemplary structure, but the corrective external lenses 106 and 108, and the optical shutter 110 are not shown.

[0034] Furthermore, for the same reason of the shift of the active area of the surface, the surfaces can also shift their edges along the Y axis. On the side closer to the coupling-in surface (+Y), they are closer to the user's eye (-Z), and as they are positioned away from the coupling-in surface (-Y), the surfaces are positioned towards the spectacle view side (+Z). Thus, the structure of the lens 312 shown in FIG. 3C can be used as well.

[0035] FIG. 3C shows a further embodiment that improves the manufacturability and brightness of the system. In the figure, a lens 312 having a surface with edges shifted along the Y axis is shown on the side closer to the +Z side. Such a structure is advantageous for the following reasons. - It is relatively easy to manufacture a structure having an array with parallel edges 314 and 316. - The system efficiency is improved if the surface 118n does not reflect the light of the beam 318 away from the EMB112. However, the light rays of the beam 318 reaching the surface 118a have different intensities because the number of surface beams 318 changes along the Z-axis position of the light rays hitting the surface 118a until they reach the surface 118a.

[0036] This should be taken into account when designing the coating reflectivity and the spacing between the surfaces 118. For example, the light ray 320C, unlike the light ray 320A, may have a lower intensity than the light ray 320A because the light ray 320C propagates through the surface 118.

[0037] In addition, in order to prevent the light from being scattered by the scattering and diffraction effects and damaging the image, special attention should be paid to the edges of the surface 118 along the plane 316. For example, the light ray 320b can be scattered by the edge effect of the surface 134.

[0038] Due to the nature of the surface array of the FBS lens 102, the light expanded when hitting the array should be collimated along the expansion axis (vertical in the figure, Y direction).

[0039] According to some embodiments of the present invention, the focal plane can be changed by an additional lens (plural) (for example, the lens 106 in FIG. 1B) positioned between the user's eye and the FBS.

[0040] According to some embodiments of the present invention, an additional lens (plural) can be used to correct the focus of the landscape image.

[0041] According to some embodiments of the present invention, when using a spherical lens, it may not be possible to adhere the shutter to the spherical surface of the lens, so it may not be possible to use an optical shutter (plural). Therefore, the shutter 110 can be positioned between the lens 108 and the FBS lens 102 as shown in FIGS. 1B, 2A, and 3A.

[0042] Figure 4A shows an optional near-eye display (NED) optical system 400 having a main lens 402 with a spherically curved inner main surface. As can be seen in the figure, the inner main surface 404 may have optical power, while the outer main surface 406 may not have optical power. Accordingly, the shutter 110 may be adhered to the outer main surface 406 of the lens 402, and an additional external lens 408 may be adhered to the shutter 110.

[0043] Figure 4B shows an alternative compact near-eye display (NED) system 450 in which the main lens 452 is cylindrically curved at the inner main surface 454 and the outer main surface 456. As can be seen in the figure, both main surfaces of the lens 452, namely, the inner main surface 454 and the outer main surface 456, have optical power. The shutter 110 may be adhered to the non-flat main surface 456.

[0044] However, in the case of the shutter 110 that cannot be adhered to a spherical surface but can only be adhered to a cylindrical curved surface, both surfaces 454 and 456 should have only a cylindrical radius of curvature.

[0045] According to some embodiments of the present invention, both the main inner surface 454 and the main outer surface 456 are set such that the powers of the two surfaces cancel each other out (substantially), and thus may have a vertical cylindrical power (along the array of FBS lenses 452) so as not to change the landscape image focus, but the focus of the vertical focus of the image may be changed.

[0046] According to some embodiments of the present invention, the light projected via the projection unit 104 onto the lens 452 may have different focal planes between the two axes after propagating through the curved surface 454 so that the image may have a symmetric focus at a desired distance.

[0047] Figures 5A and 5B show a 2D expansion system 500 in which the FBS lens 522 is composed of two parts, where the surface 118 expands the image vertically and the surface 117 expands the light along the horizontal direction. For simplicity, the projection unit is not shown in the figure. As shown, the light ray 528 is first injected from above and expanded horizontally by the surface 117, and then expanded vertically by the surface 118. The same system is shown in a side view in Figure 5B. The light ray after 2D expansion exiting the FBS lens 522 is indicated by 532. For simplicity, only a single direction of light propagation is shown in the figure.

[0048] Figures 6A and 6B show an optical system that uses an FBS lens 610 to deflect light from an external source to an EMB from outside the lens 610 without propagation along the lens 610 itself. The projection unit 104 and its microdisplay 105 project a light ray 612 of collimated light at an acute angle with respect to the placement axis α. The light 612 enters the lens 610 through the main surface 616. In one embodiment, the collimated light enters the main surface 616 at an angle between 5° and 45° with respect to the placement axis α. A thin film or coating with specific optical properties can be applied to the main surface 616 so that the incident light can be directed to enter the lens 610 at a shallow angle.

[0049] A part of the light 612 entering the lens 610 through the first main surface 616 can be immediately deflected as the light ray 612a from the FBS surface 118 towards the EMB. A part of the light 612 entering the lens 610 through the first main surface 616 can be transmitted through one or more FBS surfaces 118 and then reflected from another surface 118 towards the EMB as the light ray 612b. Note that in the embodiments of Figures 6A and 6B, there is no light propagation along the lens 610 itself (along the placement axis α) due to total internal reflection from the first main surface 614 and the second main surface 616.

[0050] Definition Included below are definitions of selected terms used herein. The definitions include various examples or forms of components that fall within the scope of the terms and may be used in embodiments. The examples are not intended to be limiting. Both the singular and plural forms of the terms may be within the scope of the definitions.

[0051] "Operable connection" or an entity being "operably connected" means a connection through which signals, physical communication, or logical communication can be transmitted and received. Typically, an operable connection includes a physical interface, an electrical interface, or a data interface, but note that an operable connection may include different combinations of these or other types of connections sufficient to enable operable control. For example, two entities can be operably connected by being able to transmit signals directly to each other or through one or more intermediate entities such as a processor, an operating system, logic, software, or other entities. An operable connection can be made using a logical or physical communication channel.

[0052] The terms "includes" or "including", as used in the detailed description or claims, are intended to be inclusive in the same manner as the term "comprising" as construed when used as a transitional term in the claims. Further, the term "or", as used in the detailed description or claims (e.g., A or B), is intended to mean "A or B or both". Where the applicant intends to indicate "only A or B, but not both", the term "only A or B, but not both" is used. Accordingly, the use of the term "or" herein is inclusive and not exclusive. See Bryan A. Garner, A Dictionary of Modern Legal Usage 624 (2d Ed. 1995).

[0053] The exemplary systems, methods, etc. have been illustrated by way of examples and described in fairly detailed examples. However, it is not the intention of the applicant to limit the scope in such detail or to limit it in any way. Of course, for the purpose of describing the systems, methods, etc. described in this specification, it is not possible to describe every possible combination of components or methodologies. Further advantages and modifications will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the specific details, representative devices, and exemplary examples illustrated and described. Accordingly, this application is intended to cover changes, modifications, and variations that are included within the scope of the appended claims. Furthermore, the foregoing description is not intended to limit the scope of the present invention. Rather, the scope of the present invention is determined by the appended claims and their equivalents.

Claims

1. A near-eye display optical system, comprising: a lens extending along an arrangement axis and having (a) an input plane and (b) first and second main surfaces generally extending along the arrangement axis; the lens being configured to receive light corresponding to an image collimated along the arrangement axis via the input plane; the lens comprising a set of partially reflective internal surfaces disposed at an angle with respect to the arrangement axis along the arrangement axis, a first partially reflective internal surface from the set disposed closest to the input plane having a lower reflectivity than a second partially reflective internal surface disposed at a position farthest from the input plane, and at least a portion of the light reaching the second partially reflective internal surface after being transmitted by the first partially reflective internal surface and without being previously reflected from the first or second main surface. A near-eye display optical system.

2. The near-eye display optical system according to claim 1, wherein the second partially reflective internal surface reflects at least a portion of the light from the lens at an angle of 90 degrees towards an eye movement box of a user of the near-eye display optical system.

3. The near-eye display optical system according to claim 1, further comprising a projection unit configured to project the light corresponding to the image collimated along the arrangement axis onto the lens via the input plane.

4. a first external lens adjacent to the first main surface and having optical power; a second external lens adjacent to the second main surface and having optical power complementary to the optical power of the first external lens, wherein landscape light transmitted through the first external lens and acted on by the optical power of the first main surface then passes through the second external lens acted on by the optical power of the second main surface and appears to the user similar to the landscape light first received by the first external lens. A second external lens. The near-eye display optical system according to claim 1.

5. at least one of the first and second external lenses is non-planar, or the first and second external lenses are not parallel to each other. The near-eye display optical system according to claim 4.

6. An optical shutter disposed between (a) one of the first and second external lenses and (b) a corresponding one of the first and second main surfaces, overlapping at least some of the partial reflective surfaces along the optical axis of the near-eye display optical system, the optical shutter incorporating a polarizer oriented such that only P-polarized light is transmitted from the landscape light through the lens and the partial reflective surface towards the user's eye, the partial reflective surface coating being polarization-dependent, having a low P-polarization reflectivity and a high S-polarization reflectivity. The near-eye display optical system according to claim 4, comprising such an optical shutter.

7. An external lens adjacent to the second main surface and having an optical power configured to reflect light towards a fixation center of a user of the near-eye display optical system, the fixation center of the user being positioned at a predefined distance from the user's eye. The near-eye display optical system according to claim 1, comprising such an external lens.

8. The external lens has a curved surface, and after the image propagates through the curved surface, the image has different focal planes between two axes such that the image has symmetric foci at the predefined distance. The near-eye display optical system according to claim 7.

9. The first partial reflective inner surface and the second partial reflective inner surface are configured to reflect light towards a fixation center of a user of the near-eye display optical system, the fixation center being positioned at a predefined distance from the user's eye. The near-eye display optical system according to claim 1.

10. At least one of the first and second main surfaces is non-planar, or the first and second main surfaces are not parallel. The near-eye display optical system according to claim 1.

11. The set of partial reflective inner surfaces is configured to reflect the light from the lens towards a pupil movement box of a user of the near-eye display optical system, the spacing between the partial reflective surfaces within the set varies, and the spacing is set to induce a uniform intensity distribution of all light fields in the pupil movement box. The near-eye display optical system according to claim 1.

12. The near-eye display optical system according to claim 1, wherein the partial reflection regions of the first and second partial reflection surfaces are inclined with respect to the arrangement axis, the partial reflection region of the second partially reflective inner surface is close to the first main surface, while the partial reflection region of the first partially reflective inner surface is close to the second main surface.

13. A near-eye display comprising a plurality of lenses according to claim 1, wherein a first lens of the plurality of lenses is configured to expand the light in a first direction, and a second lens of the plurality of lenses is then configured to expand the light in a second direction perpendicular to the first direction.

14. A near-eye display optical system, comprising a lens extending along an arrangement axis and having (a) an input plane and (b) first and second main surfaces generally extending along the arrangement axis, the lens being configured to receive collimated light corresponding to an image, the collimated light entering the lens through the input plane, the lens including a set of partially reflective inner surfaces disposed at an angle with respect to the arrangement axis and along the arrangement axis, the first partially reflective inner surface from the set having a partial reflectivity such that at least a portion of the collimated light is reflected from the lens by the first partially reflective inner surface without being previously reflected from the first or second main surface.

15. The near-eye display optical system according to claim 14, wherein the input plane corresponds to the first main surface or the second main surface.

16. The near-eye display optical system according to claim 14, wherein the collimated light enters the lens at an acute angle with respect to the arrangement axis and through the first main surface or the second main surface.

17. The near-eye display optical system according to claim 14, wherein at least a portion of the collimated light is transmitted by the first partially reflective inner surface and then reaches the lens and is reflected from the lens by a second partially reflective inner surface from the set.

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