Optical machine and enhanced display device
By combining a polarizing holographic grating with a triangular prism, the problem of large optical path system size in AR display devices is solved, achieving compact optical mechanism and efficient optical path, which is suitable for AR glasses.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-04-03
AI Technical Summary
The optical path system in existing AR display devices is relatively large, making it difficult to apply effectively in devices such as AR glasses.
By combining a polarizing holographic grating with a triangular prism-shaped first prism, the size of the optical path system is reduced through the diffraction and reflection of polarized light, and a modulation chip is used to modulate the polarized light to form an efficient optical path design.
It achieves a reduction in the size of the optical engine, a shape that matches AR glasses, high light efficiency, and a flexible overall optical path design that meets the shape requirements of AR glasses.
Smart Images
Figure CN224081890U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical technology, and in particular to an optomechanical and enhanced display device. Background Technology
[0002] As AR (Augmented Reality) technology matures, micro-projection is gradually entering the commercialization stage. With advancements in imaging technology, people's demand for immersive experiences is increasing, with image quality and overall thinness being key considerations. Micro-projection technology in AR systems is typically based on display chips. The mainstream passive light-emitting display chips include LCOS (Liquid Crystal On Silicon) chips and DMD (Digital Micromirror Device) chips. Among these, LCOS chips offer better resolution and cost advantages, while DMD chips boast higher contrast and luminous efficiency.
[0003] LCOS chips often require the use of a PBS (Polarizing Beam Splitter) prism. The PBS prism is a cubic structure, relatively large in size, which is not conducive to its application in AR glasses. DMD chips require light to enter and exit at specific angles, making the optical path less flexible. They typically require two prisms, resulting in a larger overall size. Utility Model Content
[0004] The purpose of this application is to provide an optical engine and an enhanced display device, which aims to solve the technical problem of the large size of the optical path system in existing AR display devices.
[0005] The embodiments of this application are implemented as follows: an optical engine, comprising:
[0006] A light source assembly for providing first polarized light;
[0007] A light source assembly for providing first polarized light;
[0008] A polarizing holographic grating is used to diffract the first polarized light and obtain a second polarized light that is deflected relative to the first polarized light.
[0009] The first prism has a first surface, a second surface, and a third surface arranged at an angle to each other. The first surface is used to receive the second polarized light, and the second polarized light is emitted through the second surface.
[0010] A modulation chip, disposed opposite to the second surface of the first prism, is used to receive the second polarized light and to incident a third polarized light obtained by modulating the second polarized light into the first prism from the second surface; the third polarized light is reflected by the first surface within the first prism and exits from the third surface.
[0011] In one embodiment, the polarizing holographic grating is a transmissive polarizing holographic grating, and the first surface is disposed on the light-emitting side of the polarizing holographic grating.
[0012] In one embodiment, the modulation chip includes a liquid crystal silicon-based chip.
[0013] In one embodiment, the modulation chip includes a second quarter-wave plate and a digital micromirror chip, wherein the second quarter-wave plate is disposed between the second surface and the digital micromirror chip.
[0014] In one embodiment, the refractive index of the first prism is greater than or equal to 1.4, and the third polarized light is incident perpendicular to the second surface.
[0015] In one embodiment, the angle between the first surface and the second surface is 45 degrees, and the angle between the second surface and the third surface is 90 degrees.
[0016] In one embodiment, the light source assembly includes a light source and a light modulation assembly, the light modulation assembly being used to modulate the light emitted by the light source into the first polarized light;
[0017] The optical modulation component includes a polarizer and a first quarter-wave plate arranged sequentially along the optical path, wherein the angle between the fast axis and slow axis of the first quarter-wave plate and the polarization direction of the polarizer is 45 degrees or -45 degrees; or, the optical modulation component includes a polarizer and an optically active crystal arranged sequentially along the optical path; or, the optical modulation component includes a polarizer and a liquid crystal device arranged sequentially along the optical path.
[0018] In one embodiment, the optomechanism further includes a collecting lens disposed between the light source and the light modulation component; and / or, the optomechanism further includes a second prism disposed between the light source and the light modulation component, the second prism being a freeform prism having a freeform reflecting surface for reflecting light from the light source.
[0019] In one embodiment, the optomechanic further includes a field lens disposed between the second surface of the prism and the modulation chip, the field lens being used to converge the second polarized light and the third polarized light.
[0020] Another objective of this application is to provide an enhanced display device, which includes an optical engine as described in the above embodiments, and an optical waveguide disposed on the light-emitting side of the optical engine. The optical waveguide is provided with a coupling-in region and at least one coupling-out region. A light beam emitted from the optical engine is coupled into the optical waveguide through the coupling-in region and emitted from the coupling-out region.
[0021] The optical engine and enhanced display device provided in this application have the following advantages:
[0022] The optomechanism provided in this application utilizes the polarization sensitivity and angle adjustment characteristics of a polarizing holographic grating to diffract first polarized light into a deflected second polarized light. This second polarized light passes through a first prism, and a modulation chip modulates the second polarized light emitted from the first prism, resulting in a third polarized light that re-enters the first prism and is reflected out. Overall, this optomechanism uses a polarizing holographic grating combined with a triangular prism-shaped first prism, eliminating the need for a cubic prism and reducing its size. The optomechanism has a near-elongated shape, matching the form of augmented reality (AR) glasses. Furthermore, the high diffraction efficiency of the polarizing holographic grating results in high luminous efficiency for the optomechanism. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 It is an existing optomechanical architecture;
[0025] Figure 2 It is another optical-mechanical architecture in existing technology;
[0026] Figure 3 It is another optical-mechanical architecture in existing technology;
[0027] Figure 4 This is a diagram of the optomechanical architecture provided in the first embodiment of this application;
[0028] Figure 5 This is a diagram of the optomechanical architecture provided in the second embodiment of this application;
[0029] Figure 6 This is a diagram of the optomechanical architecture provided in the third embodiment of this application.
[0030] The markings in the diagram mean:
[0031] 001-Polarizer, 002-Collecting optical components, 003-PBS prism, 004-Liquid crystal silicon-based panel, 005-Quarter-wave plate, 006-Reflector, 007-Optical wedge, 008-Total internal reflection prism, 009-DMD chip;
[0032] 100-Optical Mechanics;
[0033] 3-Light source assembly, 31-Light source, 38-Light modulation assembly, 382-Polarizer, 383-First quarter-wave plate, 34-Collecting lens, 341-Lens, 35-Second prism, 351-Freeform reflective surface;
[0034] 4-Polarization holographic grating;
[0035] 5-First prism, 51-First surface, 52-Second surface, 53-Third surface;
[0036] 6-Modulation chip, 61-Liquid crystal silicon-based chip, 63-Second quarter-wave plate, 64-Digital micromirror chip;
[0037] 7-lens;
[0038] 8-field shot. Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0040] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly fixed to or set on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this patent. The terms "first" and "second" are used only for the purpose of description and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly specified.
[0041] To illustrate the technical solutions described in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.
[0042] Please see Figure 1As shown, the incident light beam (in all the figures of the embodiments of this application, the light beam is shown as a dashed line) is polarized by the polarizer 001 to obtain first polarized light. The first polarized light is incident on the PBS prism 003, which reflects the first polarized light to the liquid crystal silicon substrate panel 004. After being adjusted by the liquid crystal silicon substrate panel 004, it becomes second polarized light orthogonal to the polarization direction of the first polarized light. The second polarized light can pass through the PBS prism 003 and is finally emitted. In this architecture, the cubic PBS prism 003 is relatively large, and the luminous efficiency of the PBS prism 003 is not high, which affects the optomechanical efficiency. In addition, usually, in order to achieve light homogenization, an additional relay system is required, making the overall size of the optomechanical system even larger, or, as Figure 1 As shown, at least one collecting optics 002 is used to homogenize the light before the polarizer 001, resulting in a large back cutoff of the entire optomechanical system (close to the width of the entire PBS prism 003).
[0043] and, Figure 1 The architecture shown is L-shaped, which does not match the shape of AR glasses and is difficult to use in AR glasses.
[0044] Please see Figure 2 As shown, with Figure 1 In contrast, the second polarized light transmitted from the PBS prism 003 undergoes polarization conversion via a quarter-wave plate 005 and is reflected again by the quarter-wave plate 005 to obtain a third polarized light with the same polarization direction as the first polarized light. This third polarized light is then incident on the PBS prism 003, reflected by it, and exits. While this optical mechanism is generally elongated, the addition of the reflector 006 and quarter-wave plate 005 increases cost, assembly difficulty, and size. Furthermore, the second polarized light passes through the PBS prism 003 again, further reducing the optical efficiency.
[0045] Please see Figure 3 As shown, the incident beam is reflected by reflector 006, passes through optical wedge 007, and enters total internal reflection prism 008. After exiting total internal reflection prism 008, it is obliquely incident on DMD chip 009. After angle adjustment by DMD chip 009, it exits at an angle approximately perpendicular to DMD chip 009, undergoes total internal reflection within PBS prism 003, and then exits. In this architecture, the beam must meet the angle adjustment requirements of DMD chip 009 between reflector 006, optical wedge 007, and total internal reflection prism 008, resulting in an inflexible optical path design and a poor overall shape. In addition, the use of optical wedge 007 and total internal reflection prism 008 leads to a large overall size. If additional homogenization and relay systems are added, the size will become even larger.
[0046] Next, please refer to Figures 4 to 6As shown, this application provides a solution that can reduce the size of the optical engine 100.
[0047] First, this application provides an optical engine 100.
[0048] Please see Figures 4 to 6 As shown, the optomechanical system 100 includes a light source assembly 3, a polarizing holographic grating 4, a first prism 5, and a modulation chip 6.
[0049] The light source assembly 3 is used to emit first polarized light. The polarizing holographic grating 4 is used to diffract the first polarized light to obtain second polarized light. The first prism 5 has a first surface 51, a second surface 52, and a third surface 53 arranged at an angle to each other. The first surface 51 is used to receive the second polarized light from the polarizing holographic grating 4. The modulation chip 6 is disposed on one side of the second surface 52. The modulation chip 6 is used to receive the second polarized light emitted from the second surface 52 of the first prism 5, modulate the second polarized light to obtain third polarized light, and cause the third polarized light to enter the first prism 5 from the second surface 52. The third polarized light is reflected by the first surface 51 in the first prism 5 and emitted from the third surface 53.
[0050] The first prism 5 has a first surface 51, a second surface 52, and a third surface 53 arranged at an angle to each other, and the first prism 5 is generally in the shape of a triangular prism. The polarizing holographic grating 4 is configured to match the polarization characteristics of the first polarized light. After the first polarized light is incident into the polarizing holographic grating 4, it will diffract and obtain a second polarized light that is deflected relative to the incident direction of the first polarized light. The second polarized light is incident from the first surface 51 of the first prism 5 and exits from the second surface 52, reaching the modulation chip 6. The modulation chip 6 modulates the second polarized light to obtain a third polarized light and reflects the third polarized light to the second surface 52. The third polarized light is incident from the second surface 52 of the first prism 5 and reaches the first surface 51, is reflected at the first surface 51, and finally exits from the third surface 53.
[0051] The optomechanism 100 provided in this application embodiment utilizes the polarization-sensitive and angle-adjusting characteristics of the polarizing holographic grating 4 to diffract first polarized light into deflected second polarized light. This second polarized light passes through a first prism, and a modulation chip 6 modulates the second polarized light emitted from the first prism 5. The resulting third polarized light then re-enters the first prism 5 and is reflected out. Overall, the optomechanism 100 uses a polarizing holographic grating 4 combined with a triangular prism-shaped first prism 5, eliminating the need for a cubic PBS prism and reducing its size. The optomechanism 100 has a near-elongated shape, matching the form of augmented reality (AR) glasses, for example. The high diffraction efficiency of the polarizing holographic grating 4 results in high luminous efficiency for the optomechanism 100.
[0052] like Figures 4 to 6 As shown, the optical engine also includes a lens 7, which is disposed opposite to the third surface 53 and is used to receive third polarized light from the third surface 53. The third polarized light is further emitted from the lens 7.
[0053] In one embodiment, the first polarized light is circularly polarized. The second polarized light is circularly polarized.
[0054] In one embodiment, the rotation direction of the second polarized light is opposite to that of the first polarized light. For example, when left-handed polarized light is incident on the polarizing holographic grating 4, the diffracted beam is right-handed circularly polarized light; when right-handed polarized light is incident on the polarizing holographic grating 4, the diffracted beam is left-handed circularly polarized light.
[0055] The third polarized light is circularly polarized.
[0056] In one embodiment, the first polarized light is linearly polarized light. The second polarized light is either linearly polarized light or circularly polarized light. The third polarized light is either linearly polarized light or circularly polarized light.
[0057] In one embodiment, the refractive index of the first prism 5 is greater than that of air. Therefore, when the third polarized light exits at the first surface 51, it is essentially moving from an optically denser medium to an optically less dense medium. Considering the specific refractive index of the first prism 5 and the angular relationship between the first surface 51 and the second surface 52, total internal reflection of the third polarized light can be achieved at the first surface 51. That is, all the third polarized light within the first prism 5 can exit from the third surface 53 of the first prism 5.
[0058] In one embodiment, the refractive index of the first prism 5 is greater than or equal to 1.4. In an alternative embodiment, the first prism 5 is an RTIR (Reverse Total Internal Reflection) prism.
[0059] Optionally, the third surface 53 of the first prism 5 is perpendicular to the second surface 52.
[0060] Optionally, the angle between the first surface 51 and the second surface 52 is 45 degrees. In this case, the third polarized light is perpendicular to the second surface 52. When the third polarized light is incident on the first surface 51 at an angle of incidence greater than or equal to 45 degrees, total internal reflection can occur.
[0061] In one embodiment, the polarizing holographic grating 4 is a transmissive polarizing holographic grating, through which the first polarized light can be transmitted and diffracted. This arrangement aims to ensure that the polarizing holographic grating 4 is as close as possible to the first surface 51, or in other words, that the first surface 51 is located on the light-emitting side of the polarizing holographic grating 4, thereby allowing for a more compact overall structure of the optomechanical system 100.
[0062] The polarizer holographic grating 4 can be as close as possible to the first surface 51. For example, the distance between the light-emitting surface of the polarizer holographic grating 4 and the first surface 51 can be as close as possible to 0. In an optional embodiment, the distance between the light-emitting surface of the polarizer holographic grating 4 and the first surface 51 can be 0, that is, the light-emitting surface of the polarizer holographic grating 4 is attached to the first surface 51.
[0063] In other alternative embodiments, the polarizing holographic grating 4 can be a reflective polarizing holographic grating. The first polarized light is reflected and diffracted by the reflective polarizing holographic grating.
[0064] In one embodiment, please refer to Figures 4 to 6 As shown, the light source assembly 3 includes a light source 31 and a light modulation assembly 38. The light modulation assembly 38 is located on the light incident side of the polarizer holographic grating 4 and is used to modulate the light emitted by the light source 31 (the light emitted by the light source 31 has no fixed polarization direction) into first polarized light.
[0065] Specifically, please refer to Figures 4 to 6 As shown, in one optional embodiment, the optical modulation component 38 includes a polarizer 382 and a first quarter-wave plate 383 arranged sequentially along the optical path, and the angle between the fast axis and slow axis of the first quarter-wave plate 383 and the polarization direction of the polarizer 382 is 45 degrees or -45 degrees.
[0066] The light emitted from light source 31 becomes linearly polarized after passing through polarizer 382. When the linearly polarized light passes through first quarter-wave plate 383, since the angle between the fast and slow axes of first quarter-wave plate 383 and the polarization direction of polarizer 382 is 45 degrees or -45 degrees, the phase difference between the two components of the linearly polarized light along the fast and slow axes becomes π / 2, thus obtaining circularly polarized light. Specifically, when the angle between the fast and slow axes of first quarter-wave plate 383 and the polarization direction of polarizer 382 is 45 degrees, the first polarized light is left-handed circularly polarized; when the angle between the fast and slow axes of first quarter-wave plate 383 and the polarization direction of polarizer 382 is -45 degrees, the first polarized light is right-handed circularly polarized.
[0067] In other alternative embodiments, the first quarter-wave plate 383 in the optical modulation component 38 can also be replaced by an optical crystal with optical rotation (not shown). After the linearly polarized light obtained by the polarizer 382 passes through the optical crystal with optical rotation, the light vector rotates by 90 degrees or -90 degrees, and thus obtains left-hand circularly polarized light or right-hand circularly polarized light.
[0068] In other alternative embodiments, the first quarter-wave plate 383 in the optical modulation component 38 can also be replaced by a liquid crystal device (not shown). When linearly polarized light is incident on the liquid crystal device, by controlling parameters such as the electric field strength and frequency applied to the liquid crystal device, the arrangement of the liquid crystal molecules changes accordingly, so that after the linearly polarized light passes through the liquid crystal device, a phase difference of π / 2 is generated between the two components of the linearly polarized light along the fast axis and the slow axis, thereby obtaining polarized light.
[0069] In one embodiment, please refer to Figure 4 As shown, the light source assembly 3 also includes a collecting lens 34 for focusing and homogenizing light, which is located on the light incident side of the light modulation assembly 38. The purpose of this arrangement is that the collecting lens 34 can focus the incident light beam and make the light uniform. Therefore, the size of the polarizer holographic grating 4 and the first surface 51 of the first prism 5 can be reduced. After the incident light beam exits from the collecting lens 34, it only needs to correspond to a portion of the width of the first prism 5. In this way, the volume of the optical engine 100 can be further reduced, and the backstop of the optical engine 100 can be reduced.
[0070] The collecting lens 34 may include one lens 341 or multiple lenses 341. For example, Figure 4 As shown, the collecting lens 34 includes two lenses 341 arranged sequentially along the optical path.
[0071] In one embodiment, please refer to Figure 5 and Figure 6 As shown, the light source assembly 3 also includes a second prism 35 disposed on the light incident side of the light modulation assembly 38. The second prism 35 is a freeform prism, which has a freeform reflecting surface 351 for reflecting the incident light beam. The purpose of this arrangement is that, through the freeform reflecting surface 351, the positional relationship between the light source 31 and the light modulation assembly 38 can be changed, thereby optimizing the overall shape of the optical engine 100 to be closer to a long strip shape, which is convenient for use in AR glasses. At the same time, through the design of the freeform reflecting surface 351, the convergence and homogenization of the incident light beam can be achieved simultaneously, as well as reducing the volume of the optical engine 100.
[0072] In some other embodiments, the light source assembly 3 may include both the collecting lens 34 and the freeform prism described above. The freeform prism is disposed on the light-emitting side of the collecting lens 34 to simultaneously optimize the shape of the optical engine 100 and reduce its volume.
[0073] In one embodiment, please refer to Figure 5 and Figure 6As shown, the optomechanism 100 also includes a field lens 8, which is disposed between the second surface 52 of the first prism 5 and the modulation chip 6, and is used at least to converge and guide the second polarized light and the third polarized light. This arrangement aims to reduce the loss of the second polarized light and improve the light efficiency of the optomechanism 100. In other optional embodiments, by setting the specific parameters of the field lens 8, it can also be used to correct aberrations, expand the field of view, etc.
[0074] Please see Figure 4 and Figure 5 As shown, in one embodiment, the modulation chip 6 includes a liquid crystal silicon-based chip 61.
[0075] In one embodiment, both the second and third polarized light are circularly polarized. After being modulated and reflected by the liquid crystal silicon chip 61, the second polarized light remains circularly polarized, and its rotation direction is the same as that of the second polarized light. That is, at this time, the third polarized light has the same rotation direction as the second polarized light.
[0076] In this embodiment, the second polarized light is incident and reflected perpendicular to the liquid crystal silicon chip 61.
[0077] Please see Figure 6 As shown, in one embodiment, the modulation chip 6 includes a second quarter-wave plate 63 and a digital micromirror chip 64, wherein the second quarter-wave plate 63 is disposed between the second surface 52 of the first prism 5 and the digital micromirror chip 64.
[0078] The second polarized light is circularly polarized. After passing through the second quarter-wave plate 63, the second polarized light is converted into linearly polarized light. After being controlled by the digital micromirror chip 64, the linearly polarized light passes through the second quarter-wave plate 63 again and becomes third polarized light. The third polarized light is circularly polarized. At this time, the rotation direction of the third polarized light is opposite to that of the second polarized light.
[0079] In this embodiment, the second polarized light is incident perpendicular to the digital micromirror chip 64, and the second polarized light and the third polarized light are set at an angle. Optionally, the third polarized light is reflected perpendicular to the digital micromirror chip 64.
[0080] Finally, this application embodiment also provides an enhanced display device (not shown), including an optical engine 100 as described in the above embodiments and an optical waveguide (not shown) disposed on the light-emitting side of the optical engine 100. The optical waveguide is provided with a coupling-in region and at least one coupling-out region. A light beam emitted from the optical engine 100 is coupled into the optical waveguide through the coupling-in region and emitted from the coupling-out region.
[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An optical engine, characterized in that, include: A light source assembly for providing first polarized light; A polarizing holographic grating is used to diffract the first polarized light and obtain a second polarized light that is deflected relative to the first polarized light. The first prism has a first surface, a second surface, and a third surface arranged at an angle to each other, wherein the first surface is used to receive the second polarized light; The second polarized light is emitted through the second surface; A modulation chip, disposed opposite to the second surface of the first prism, is used to receive the second polarized light and to incident a third polarized light obtained by modulating the second polarized light into the first prism from the second surface; the third polarized light is reflected by the first surface within the first prism and exits from the third surface.
2. The optical engine as described in claim 1, characterized in that, The polarizing holographic grating is a transmissive polarizing holographic grating, and the first surface is disposed on the light-emitting side of the polarizing holographic grating.
3. The optical engine as described in claim 1, characterized in that, The modulation chip includes a liquid crystal silicon-based chip.
4. The optical engine as described in claim 1, characterized in that, The modulation chip includes a second quarter-wave plate and a digital micromirror chip, wherein the second quarter-wave plate is disposed between the second surface and the digital micromirror chip.
5. The optical engine as described in any one of claims 1 to 4, characterized in that, The refractive index of the first prism is greater than or equal to 1.4, and the third polarized light is incident perpendicularly to the second surface.
6. The optical engine as described in claim 5, characterized in that, The angle between the first surface and the second surface is 45 degrees, and the angle between the second surface and the third surface is 90 degrees.
7. The optical engine as described in any one of claims 1 to 4, characterized in that, The light source assembly includes a light source and a light modulation assembly, wherein the light modulation assembly is used to modulate the light emitted by the light source into the first polarized light; The optical modulation component includes a polarizer and a first quarter-wave plate arranged sequentially along the optical path, wherein the angle between the fast axis and slow axis of the first quarter-wave plate and the polarization direction of the polarizer is 45 degrees or -45 degrees; or, the optical modulation component includes a polarizer and an optically active crystal arranged sequentially along the optical path; or, the optical modulation component includes a polarizer and a liquid crystal device arranged sequentially along the optical path.
8. The optical engine as described in claim 7, characterized in that, The optical engine further includes a collecting lens disposed between the light source and the light modulation component; and / or, the optical engine further includes a second prism disposed between the light source and the light modulation component, the second prism being a freeform prism having a freeform reflecting surface for reflecting light from the light source.
9. The optical engine as described in any one of claims 1 to 4, characterized in that, The optomechanic also includes a field lens, which is disposed between the second surface of the prism and the modulation chip. The field lens is used to converge the second polarized light and the third polarized light.
10. An enhanced display device, characterized in that, The optical engine includes any one of claims 1 to 9, and an optical waveguide disposed on the light-emitting side of the optical engine, wherein the optical waveguide is provided with a coupling-in region and at least one coupling-out region, wherein a light beam emitted from the optical engine is coupled into the optical waveguide through the coupling-in region and emitted from the coupling-out region.