Linear waveguide display optical system and AR glasses

Abstract

The application discloses a linear waveguide display optical system and AR glasses, and the system comprises a plurality of light source devices, a light combination device, an ommatidium light uniformization device, a relay device, a polarization beam splitting device, a reflection imaging device and a projection device; after the main light beam is reflected by the polarization beam splitting device, the polarization state is changed into P light, reaches the reflection imaging device, reflects the light beam to obtain a reflected light beam with image information, and converts the polarization state of the light beam into S light; at this time, the main light beam is S light and can be transmitted to the quarter-wave plate through the polarization beam splitting device, is reflected by a mirror, passes through the quarter-wave plate again, at this time, the main light beam is changed from S light into P light, is transmitted to the lens after being reflected by the polarization beam splitting device to realize imaging, and finally realizes near-eye display effect after being expanded by the diffraction waveguide. The application adopts an innovative polarization beam splitting prism structure, has a higher extinction ratio, and the overall optical module is linear, which is perfectly matched with the overall structure of the AR glasses.

Description

Technical Field

[0001] This application relates to the field of near-eye display technology, and more specifically, to a linear waveguide display optical system and AR glasses. Background Technology

[0002] Optical waveguide technology is the mainstream solution in the field of near-eye AR displays. Its advantages lie in its thinness, high transmittance, and large field of view (FOV). This not only helps achieve lightweight design, but waveguide modules also offer advantages in terms of field of view, resolution, brightness, light transmittance, and eyebox functionality. Currently, this solution truly helps create lightweight AR glasses that are suitable for everyday wear.

[0003] LCoS (Liquid Crystal on Silicon) displays are a new type of reflective projection display device. They utilize semiconductor silicon technology to control liquid crystals and thus "project" color images. Compared to transmissive LCD (Liquid Crystal Display) and DLP (Digital Light Processing) displays, LCoS displays offer advantages such as high light utilization efficiency, small size, high aperture ratio, and mature manufacturing technology, easily achieving high resolution and full color reproduction.

[0004] Traditional LCOS-based projection lighting systems introduce polarized light, but due to impure polarization, the utilization rate of light energy is low, resulting in poor black-and-white contrast and ultimately poor imaging quality.

[0005] Currently, optical waveguide display optical systems based on LCoS have relatively large optical engine structures, with an overall "L" shape and redundant structures on the front of the lenses or the sides of the temples. This causes the optical engine of the waveguide to obstruct the view to some extent, resulting in the entire AR glasses being bulky and heavy. Summary of the Invention

[0006] The purpose of this application is to provide a linear waveguide display optical system and AR glasses to improve the problems of low contrast, obstructed vision, and bulky size of traditional LCoS waveguide display optical systems.

[0007] In a first aspect, embodiments of this application provide a linear waveguide display optical system, comprising: multiple light source devices, a beam combining device, a compound eye beam homogenizing device, a relay device, a polarization beam splitting device, a reflection imaging device, a projection device, and an optical waveguide device; the beam combining device is used to combine the beams emitted by the multiple light source devices to obtain a main beam; the compound eye beam homogenizing device is used to shape the elliptical light spot emitted by the light source into a rectangular light spot that conforms to the size ratio of the display chip and has excellent beam homogenization effect; the relay device is used to adjust the illumination area of ​​the entire beam; the polarization beam splitting device is used to transmit the beam to the reflection imaging device and compress the overall optical path volume; the reflection imaging device reflects the beam to obtain a reflected beam carrying image information; the polarization beam splitting device is also used to transmit the reflected beam to the projection device for corresponding projection; the projection device magnifies the image information and transmits it to the optical waveguide device to achieve exit pupil expansion.

[0008] This application embodiment sets up multiple light source devices and light combining devices in a linear waveguide display optical system to combine multiple light beams into a main beam. By setting up a compound eye light homogenizing device, the beam can be homogenized and shaped. By setting up a relay device, the illumination area of ​​the entire beam can be adjusted. By setting up a polarization beam splitter, the polarized beam is transmitted to the reflection imaging device and the overall optical path volume is compressed. By setting up a reflection imaging device, the polarized beam is reflected to obtain a reflected beam with image information. The polarization beam splitter is also used to transmit the reflected beam to the projection device for corresponding projection. By setting up a projection device, the image information is magnified and transmitted to the optical waveguide device to achieve exit pupil expansion. This can improve the contrast of the linear waveguide display optical system, and the innovative linear optical path design can solve the problems of line-of-sight obstruction and bulky size.

[0009] Furthermore, the light source device includes: a light source and a collimating flat-top component; the collimating flat-top component is used to collimate and flatten the light emitted by the light source before transmitting it to the light combining device.

[0010] This application embodiment uses a collimation flat-top component to collimate and flatten the light emitted by the light source, thereby improving the uniformity of the main beam and enhancing the quality of subsequent projection.

[0011] Furthermore, the collimating flat-top component includes a first lens and a second lens arranged sequentially along the emission direction of the light source; the first lens and the second lens are used to collimate and flatten the light emitted by the light source.

[0012] This application embodiment achieves collimation and flat-top functions by setting a first lens and a second lens, ensuring that the Gaussian light energy distribution of the light beam emitted by the light source is as uniform as possible in space.

[0013] Furthermore, the plurality of light source devices include: a green light source device for emitting a first light beam, and a red and blue light source device for emitting a second and a third light beam; the first light beam, the second light beam, and the third light beam are combined into the main light beam by the light combining device.

[0014] This embodiment of the application, by setting up a light combining device, can combine the light beams emitted by the red, blue and green light source devices into a main beam, and transmit the main beam to the compound eye light equalization device for shaping and equalization. Thus, the main beam is made up of the three primary colors of red, blue and green, which makes it convenient to adjust the color of the main beam according to the needs later.

[0015] This application embodiment combines light by setting the characteristics of a light combining device, changing the direction of the light beam emitted by the light source device through transmission or reflection, and at the same time, folding the light path increases the space utilization and reduces the footprint of the projection lighting system.

[0016] Furthermore, the system also includes: a compound eye beam homogenizing device; the main beam obtained by the beam homogenizing device is transmitted to the relay device after being homogenized and shaped by the compound eye beam homogenizing device.

[0017] This application embodiment uses a compound eye light-uniformation device to shape the main beam before transmitting it to the relay device, thereby making the resulting light spot more uniform and matching the chip size ratio required for illumination, thus improving the light energy utilization rate of the entire lighting system.

[0018] Furthermore, the system also includes: a relay device for adjusting the illumination area of ​​the polarized beam; the main beam after being shaped and homogenized by the compound eye homogenizing device is transmitted to the beam control device after the illumination area is adjusted by the relay device.

[0019] This application embodiment adjusts the illumination area of ​​the polarized beam by setting a relay device, so that when the polarized beam is incident on the beam control device, the beam control device can receive all the polarized beams and ensure that the polarized beam is more reasonably matched to the size of the chip when it reaches the image plane. This can improve the utilization rate of light energy of the projection lighting system and reduce unnecessary light energy waste.

[0020] Furthermore, the polarization beam splitter includes a polarizer to convert the main beam from natural light to P-polarized light, preventing other polarized light from directly passing through the polarization beam splitter prism and entering the lens to form stray light.

[0021] Furthermore, the polarization beam splitter includes a polarization beam splitter prism, and the polarized beam is transmitted to the reflection imaging device after being reflected by the polarization beam splitter prism; the reflected beam obtained by the reflection imaging device reflecting the polarized beam is transmitted to the projection device for corresponding projection after being transmitted through the polarization beam splitter prism.

[0022] This embodiment of the application uses a polarizing beam splitter prism, which allows polarized light beams to be reflected by the prism and transmitted to a reflective imaging device. Simultaneously, the reflected light can also be transmitted through the prism to a projection device for projection. The beam-splitting surface of the polarizing beam splitter prism is coated with a polarizing film, unlike traditional PBS films. This polarizing beam splitter prism can reflect P-light and transmit S-light. Compared to traditional PBS, this polarizing beam splitter prism has a smaller angular effect and a higher extinction ratio.

[0023] Furthermore, the polarization beam splitter also includes a quarter-wave plate and a reflector, wherein the quarter-wave plate and the reflector are cemented together to form a reflecting wave plate, and the reflecting wave plate is cemented together with the polarization beam splitter prism.

[0024] This embodiment of the application sets up a quarter-wave plate and a reflector. By changing the delay of the polarized beam through the quarter-wave plate, the polarization state of the polarized beam is changed. Combined with the reflector and the polarizing beam splitter, the beam deflection and compression are achieved, thus realizing a linear arrangement of the overall optical path and reducing the redundancy of the overall structure.

[0025] The polarizing beam splitter includes: a first prism and a second prism with trapezoidal cross sections, a polarizing film that reflects P and transmits S between the first prism and the second prism, a quarter-wave plate disposed on the second prism, and a reflector disposed on the quarter-wave plate.

[0026] The polarizer is disposed on the incident surface of the first prism, and the exit surface of the first prism is connected to the optical path of the reflective imaging device.

[0027] The polarizer converts the beam output by the relay device into P-polarized light, which is then reflected by the anti-P-transmitting S-polarizing film and transmitted to the reflection imaging device through the exit surface of the first prism.

[0028] The reflection imaging device modulates the P-polarized light to obtain S-polarized light with image information. The S-polarized light with image information is transmitted through the anti-P-transmitting S-polarization film to the quarter-wave plate and the mirror. After passing through the quarter-wave plate once, the S-polarized light with image information is reflected by the mirror. After passing through the quarter-wave plate again, it is transformed into P-polarized light with image information. The P-polarized light with image information is then reflected by the anti-P-transmitting S-polarization film and enters the projection device for corresponding projection imaging.

[0029] Furthermore, the system also includes a projection device and an optical waveguide device, wherein the projection device amplifies the reflected light beam carrying image information and couples it into the optical waveguide device.

[0030] This application embodiment achieves field-of-view magnification and exit pupil expansion by setting up a projection device and an optical waveguide device; the optical waveguide device includes an arrayed optical waveguide or a diffractive optical waveguide, which mainly expands the exit pupil, improves the eyebox of the optical system, and reduces the overall size.

[0031] Most preferably, the linear waveguide display optical system comprises:

[0032] A green light source device, wherein the green light source device emits a first light beam that is transmitted through the anti-blue and green transmittance beam splitter and the anti-red transmittance beam splitter and then combined into the main light beam;

[0033] The red light source device emits a second light beam, which is reflected by the red-to-green beam splitter and then combined into the main light beam.

[0034] A blue light source device, wherein the third light beam emitted by the blue light source device is reflected by the blue-green beam splitter and then combined into the main light beam;

[0035] A beam combining device is used to combine the beams emitted by the multiple light source devices to obtain a main beam;

[0036] A compound eye beam homogenizing device is used to receive the main beam output by the beam combining device and to shape and homogenize the main beam.

[0037] A relay device is used to receive the main beam output by the compound eye light equalization device and adjust the illumination area of ​​the main beam;

[0038] A polarization beam splitter includes a polarization beam splitter prism. The beam splitter surface of the polarization beam splitter prism is coated with a polarization beam splitting film. Unlike the traditional PBS film system, the polarization beam splitter prism can reflect P-light and transmit S-light. The polarization beam splitter also includes a polarizer, a quarter-wave plate, and a reflector.

[0039] A reflection imaging device receives a polarized beam output by the polarization beam splitter and reflects the polarized beam to obtain a reflected beam with image information.

[0040] The projection device amplifies the reflected light beam carrying image information, thereby increasing the field of view of the image.

[0041] Optical waveguide devices, including arrayed or diffractive waveguides, primarily expand the exit pupil, enhancing the eyebox of the optical system while reducing its overall size.

[0042] Secondly, embodiments of this application provide an AR glasses system, including the aforementioned linear waveguide display optical system.

[0043] This application embodiment includes a novel polarization beam splitter prism, which, unlike traditional PBS film systems, can reflect P-beams and transmit S-beams. It also has a smaller angular effect and a higher extinction ratio, thereby improving the contrast of the entire optical system. By using a quarter-wave plate and a mirror, the polarization state of the main beam is transformed. Combined with the polarization beam splitter prism, the optical path is compressed and a linear optical path arrangement is achieved.

[0044] Compared with the prior art, the present invention has the following advantages:

[0045] Traditional PBS is limited by the large-angle effect of the polarization beam splitting film system, making it difficult to achieve high-contrast projection at large angles, which affects the overall effect of the projection system. Furthermore, due to the "L"-shaped structure, it is difficult to arrange the optical system, resulting in bulky AR glasses.

[0046] Firstly, in terms of characteristics, the new polarizing beam splitter has a higher extinction ratio and a smaller angular effect, which can achieve higher light efficiency and contrast when applied to projection optical systems.

[0047] Second, in terms of structure, the new polarizing beam splitter features an innovative trapezoidal combination structure that enables linear optical path arrangement, reduces redundant volume, and achieves a lightweight AR glasses structure.

[0048] This invention achieves optical path compression and deflection by leveraging the polarization characteristics of the light source and arranging the optical path appropriately. It also employs an innovative polarization beam splitter prism structure, which has a higher extinction ratio compared to the traditional PBS prism structure. Ultimately, this results in a high-contrast optical system with a linear overall optical module that perfectly fits the overall structure of AR glasses.

[0049] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the structure of a linear waveguide display optical system provided in an embodiment of this application;

[0052] Figure 2 This application provides a schematic diagram of the optical path of a linear waveguide display optical system according to an embodiment of the present application.

[0053] Figure 3 This is a schematic diagram of the structure of a novel polarization beam splitter provided in an embodiment of this application;

[0054] Figure 4 A beam-splitting film curve of a novel polarizing beam splitter provided in the embodiments of this application;

[0055] Figure 5 A schematic diagram of an AR glasses structure for a conventional "L"-shaped polarizing beam splitter optical system provided in this application embodiment;

[0056] Figure 6 This is a schematic diagram of an AR glasses structure for an improved linear waveguide display optical system provided in an embodiment of this application.

[0057] Icons: 1-Green light source device; 2-Blue and red light source devices; 3-Light combining device; 4-Compound eye light homogenizing device; 5-Relay device; 6-Polarization beam splitting device; 7-Reflection imaging device; 8-Projection device; 9-Optical waveguide device; 101-Polarizer; 102-Polarization beam splitting prism; 103-Quarter-wave plate; 104-Reflector. Detailed Implementation

[0058] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0059] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0060] Figure 1This is a schematic diagram of a linear waveguide display optical system provided in an embodiment of this application. The linear waveguide display optical system includes: 1-green light source device; 2-red and blue light source device; 3-light combining device; 4-compound eye light equalization device; 5-relay device; 6-polarization beam splitting device; 7-reflection imaging device; 8-projection device; 9-optical waveguide device. The light combining device 3 combines the light beams emitted by the multiple light source devices to obtain a main beam. The compound eye light equalization device 4 shapes the elliptical light spot emitted by the light source into a rectangular light spot that conforms to the size ratio of the display chip and has excellent light equalization effect. The relay device 5 adjusts the illumination area of ​​the entire beam. The polarization beam splitting device 6 transmits the beam to the reflection imaging device 7 and compresses the overall optical path volume. The reflection imaging device 7 reflects the beam to obtain a reflected beam with image information. The polarization beam splitting device 6 also transmits the reflected beam to the corresponding projection 8 of the projection device. The projection device 8 magnifies the image information and transmits it to the optical waveguide device 9 to achieve exit pupil expansion.

[0061] First, considering that in traditional LCoS optical systems, the light beam incident on the polarization beam splitter 6 is usually unpolarized, and the polarization beam splitter 6 can only control the P-polarized beam to enter the reflection imaging device 7, half of the light energy in the unpolarized light will be wasted, resulting in low light energy utilization of the projection illumination system; in addition, since the S-polarized beam will directly pass through the polarization beam splitter 6 into the projection device 8, it will ultimately lead to low imaging contrast and poor imaging effect.

[0062] In an optional implementation of this application, the linear waveguide display optical system includes: multiple light source devices, a beam combining device 3, a compound eye beam equalization device 4, a relay device 5, a polarization beam splitter 6, a reflection imaging device 7, a projection device 8, and an optical waveguide device 9. By reasonably controlling the spot size of the illumination beam and setting a polarizer on the incident surface of the polarization beam splitter 6, the reflection imaging device 7 can utilize all the polarized beams after polarization, thus innovating a new type of polarization beam splitter with a high extinction ratio, achieving a high-contrast waveguide display optical system. Furthermore, by setting a reflector and a quarter-wave plate in the polarization beam splitter 6, combined with the polarization beam splitter film, the optical path is compressed and turned, thereby realizing the linear waveguide display optical system.

[0063] Figure 2 This application provides a schematic diagram of the optical path of a linear waveguide display optical system, as shown in the embodiment. Figure 2 As shown, multiple light source devices emit light beams respectively. Green light source device 1 emits a green light beam, while red and blue light source device 2 emits a red light beam and a blue light beam.

[0064] Secondly, the beams emitted by multiple light sources are combined into a main beam by the beam combining device 3, and the beam combining device 3 transmits the main beam to the compound eye beam equalization device 4. The beam combining device 3 combines the beams emitted by multiple light sources into one direction, that is, into the main beam, by changing the transmission direction of the beam, thus achieving the purpose of beam combining.

[0065] Furthermore, the main beam is shaped and homogenized by the compound eye homogenizing system 4, and the entire beam illumination area is controlled by the relay device 5. The polarization beam splitter 6 can transmit the input main beam to the reflection imaging device 7.

[0066] Subsequently, the reflected beam emitted by the reflection imaging device 7 carries the image information, and the polarization beam splitter 6 also transmits the reflected beam to the projection device 8.

[0067] Finally, the projection device 8 projects an amplified parallel beam of light, which is then used for pupil-expanding imaging via the optical waveguide device 9.

[0068] The projection device 8 is mainly used to project the reflected light beam carrying image information. The projection device 8 can be a projection lens. The specific type of the projection device 8 is not limited and can be adjusted according to actual projection requirements.

[0069] The optical waveguide device 9 is mainly used for expanding the exit pupil. The optical waveguide device 9 can be an arrayed optical waveguide or a diffractive optical waveguide. The specific type of the optical waveguide device 9 is not limited and can be adjusted according to the actual pupil expansion requirements.

[0070] Therefore, through the linear waveguide display optical system provided in this application embodiment, by reasonably controlling the spot size of the illumination beam and setting a polarizer on the incident surface of the polarization beam splitter 6, the reflection imaging device 7 can utilize all polarized beams, creating a novel polarization beam splitter prism with a high extinction ratio, thus realizing a high-contrast waveguide display optical system; and by setting a reflector and a quarter-wave plate in the polarization beam splitter 6, combined with the polarization beam splitter film, the optical path is compressed and turned, thus realizing a linear waveguide display optical system.

[0071] Based on the above embodiments, the plurality of light source devices include: a green light source device 1 for emitting a first light beam and a red and blue light source device 2 for emitting a second light beam and a third light beam; the first light beam, the second light beam and the third light beam are combined into the main light beam by the light combining device 3.

[0072] In an optional implementation of this application, to ensure the quality of the subsequent projected image, the light source device can adopt a three-primary-color light mode to emit green, blue, and red light respectively, i.e., setting up a green light source device 1 and a red and blue light source device 2. By adjusting the ratio of the green, red, and blue light beams, different main light beams can be obtained so that the color of the main light beam meets the needs of subsequent projection lighting.

[0073] It is worth noting that the RGB color model, also known as the red-green-blue color model, is an additive color model that adds red, green, and blue light in different proportions to produce a variety of colors. The main purpose of the RGB color model is for detecting, representing, and displaying images in electronic systems. Using the RGB color model results in a relatively simple white light illumination system, giving the projection lighting system provided in this application a wider color gamut and stronger color rendering capabilities compared to traditional projection lighting systems.

[0074] In one optional embodiment of this application, the first light beam emitted by the green light source device 1 is combined into the main light beam after being transmitted through the light combining device 3, and the second and third light beams emitted by the red and blue light source device 2 are combined into the main light beam after being reflected by the light combining device 3.

[0075] It is worth noting that, in order to combine beams of different colors into the main beam, beam combining devices 3 can be equipped with beam combining mirrors of different performance. By transmitting or reflecting beams of different colors through the beam combining mirrors, the optical paths of the beams of different colors are changed, so that the optical paths of the beams of different colors coincide with the optical path of the main beam, thus achieving beam combining. The beam combining device 3 may include a first beam combining mirror and a second beam combining mirror. By adjusting the type of coating on the first beam combining mirror and the second beam combining mirror, the performance of the first beam combining mirror and the second beam combining mirror can be changed.

[0076] Therefore, by setting up the light combining device 3 in this application embodiment, the number of optical path folds of the light beam can be reduced, the volume of the light combining part can be reduced, and the three-light light combining can be made easier, reducing the difficulty of aligning the optical axis, and at the same time avoiding the problem of uneven image color caused by misalignment of the optical axis.

[0077] Based on the above embodiments, the system further includes: a compound eye light-scaling device 4; the main beam obtained by the light-combining device 3 is transmitted to the relay device 5 after being scaled by the compound eye light-scaling device 4.

[0078] It is worth noting that the compound eye uniform light device 4 disperses the light that the main beam shines on the compound eye lens array to the entire image plane that needs to be illuminated, thus playing a role in uniform illumination. At the same time, the length and width of each small compound eye in the compound eye lens array are designed according to the aspect ratio of the image plane that needs to be illuminated, so it also plays a role in shaping the main beam, so that the subsequent projected image can have uniform brightness and an aspect ratio that meets the requirements.

[0079] Based on the above embodiments, the system further includes: a relay device 5 for adjusting the illumination area of ​​the polarized beam; the beam shaped and homogenized by the compound eye beam homogenizer 4 is transmitted to the polarization beam splitter 6 after the illumination area is adjusted by the relay device 5.

[0080] In an optional implementation of this application, to maximize the illumination area of ​​the main beam when it is transmitted to the polarization beam splitter 6, a relay device 5 can be used to adjust the illumination area of ​​the main beam. The relay device 5 includes two spherical lenses, and the main beam is transmitted to the polarization beam splitter 6 through the relay system 5, so that the relay device 5 as a whole can amplify and homogenize the main beam.

[0081] Figure 3 A schematic diagram of a novel polarization beam splitter provided as an example of this application is shown below. Figure 3 As shown, the polarization beam splitter includes: a polarizer 101, a polarizing beam splitter 102, a quarter-wave plate 103, and a reflector 104.

[0082] The polarization beam splitter 6 includes a polarizer 101, a polarizing beam splitter 102, a quarter-wave plate 103, and a reflector 104. The polarizer 101 converts the main beam into P-polarized light, which is then reflected by the polarizing beam splitter 102 and transmitted to the reflection imaging device 7. The reflection imaging device 7 reflects the polarized beam to obtain a reflected beam, which is then converted into S-polarized light. This reflected beam is transmitted through the polarizing beam splitter 102 and transmitted to the quarter-wave plate 103 and the reflector 104. The S-polarized light passes through the quarter-wave plate 103 once and is reflected by the reflector. After passing through the quarter-wave plate 103 again, it is converted into P-polarized light, which is then reflected by the polarizing beam splitter 102 and enters the projection device 8 for corresponding projection imaging.

[0083] In an optional implementation of this application, by setting a polarizing beam splitter, different processing methods can be used for P-polarized light and S-polarized light beams based on the properties of the polarizing beam splitter film in the polarizing beam splitter. The P-polarized light beam is reflected and transmitted to the reflection imaging device 7. The S-polarized light beam reflected back by the reflection imaging device 7 is transmitted into the quarter-wave plate and the reflector. The returned P-polarized light beam is reflected by the polarizing beam splitter film and enters the projection device 8 for projection. At the same time, the illumination area of ​​the projection illumination system can be reduced, and the number of optical path turns can be reduced to improve the projection quality.

[0084] Figure 4 The beam-splitting film curve of a novel polarizing beam splitter provided in this application embodiment can achieve high reflectivity of P-polarized light and high transmittance of S-polarized light, with an extinction ratio greater than 1000:1, thus realizing a high-contrast waveguide optical system.

[0085] Figure 5 This is a schematic diagram of an AR glasses structure based on an "L"-shaped traditional polarization beam splitter optical system provided in an embodiment of this application. The "L"-shaped traditional polarization beam splitter optical system violates the portability of the overall glasses design architecture, has redundant structure, and is not aesthetically pleasing.

[0086] Figure 6 This is a schematic diagram of an improved linear waveguide display optical system for AR glasses provided in an embodiment of this application. The volume of the entire linear waveguide display optical system is distributed along a straight line, the overall structure is relatively compact, and it conforms to the overall architecture of glasses. There are no redundant structures or line-of-sight obstruction issues, which is in line with the trend of AR glasses being portable and lightweight.

[0087] In summary, this application provides a linear waveguide display optical system and AR glasses, including: 1-green light source device; 2-red and blue light source device; 3-light combining device; 4-compound eye light equalization device; 5-relay device; 6-polarization beam splitting device; 7-reflection imaging device; 8-projection device; 9-optical waveguide device; the light combining device 3 is used to combine the light beams emitted by the multiple light source devices to obtain a main beam; the compound eye light equalization device 4 is used to shape the elliptical light spot emitted by the light source into a rectangular light spot that conforms to the size ratio of the display chip and has excellent light equalization effect; the relay device 5 is used to adjust the illumination area of ​​the entire beam; the polarization beam splitting device 6 is used to transmit the beam to the reflection imaging device 7 and compress the overall optical path volume; the reflection imaging device 7 reflects the beam to obtain a reflected beam with image information; the polarization beam splitting device 6 is also used to transmit the reflected beam to the corresponding projection 8 of the projection device; the projection device 8 magnifies the image information and transmits it to the optical waveguide device 9 to realize exit pupil expansion. Unlike traditional PBS film systems, the polarizing beam splitter can reflect P-beams and transmit S-beams, and has a smaller angular effect and a higher extinction ratio, thereby improving the contrast of the entire optical system. By using a quarter-wave plate and a mirror, the polarization state of the main beam is transformed, and the polarizing beam splitter is combined with the beam splitter to achieve the bending and compression of the optical path, thus realizing a linear optical path arrangement.

[0088] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A linear waveguide display optical system, characterized in that, include: Multiple light source devices, light combining devices, compound eye light homogenizing devices, relay devices, polarization beam splitting devices, reflection imaging devices, projection devices, and optical waveguide devices; The beam combining device combines the beams emitted by the multiple light source devices to obtain a main beam; the compound eye beam equalization device shapes the elliptical spot emitted by the main beam into a rectangular spot that conforms to the size ratio of the display chip; the relay device adjusts the illumination area of ​​the rectangular spot; the polarization beam splitter transmits the beam output by the relay device to the reflection imaging device and compresses the overall optical path volume; the reflection imaging device reflects the beam to obtain a reflected beam with image information; the polarization beam splitter also transmits the reflected beam with image information to the projection device for corresponding projection; the projection device magnifies the image information and transmits it to the optical waveguide device to achieve exit pupil expansion. The polarization beam splitter includes a polarization beam splitter prism and a polarizer disposed at the incident position of the polarization beam splitter prism. The polarizer is used to convert the beam output by the relay device from natural light into P-polarized light. The polarizing beam splitter includes: a first prism and a second prism with trapezoidal cross sections, a polarizing film that reflects P and transmits S between the first prism and the second prism, a quarter-wave plate disposed on the second prism, and a reflector disposed on the quarter-wave plate. The polarizer is disposed on the incident surface of the first prism, and the exit surface of the first prism is connected to the optical path of the reflective imaging device. The polarizer converts the beam output by the relay device into P-polarized light, which is then reflected by the anti-P-transmitting S-polarizing film and transmitted to the reflection imaging device through the exit surface of the first prism. The reflection imaging device modulates the P-polarized light to obtain S-polarized light with image information. The S-polarized light with image information is transmitted through the anti-P-transmitting S-polarization film to the quarter-wave plate and the mirror. After passing through the quarter-wave plate once, the S-polarized light with image information is reflected by the mirror. After passing through the quarter-wave plate again, it is transformed into P-polarized light with image information. The P-polarized light with image information is then reflected by the anti-P-transmitting S-polarization film and enters the projection device for corresponding projection imaging.

2. The linear waveguide display optical system according to claim 1, characterized in that, The plurality of light source devices include: a green light source device for emitting a first light beam, and a red and blue light source device for emitting a second and a third light beam; the first light beam, the second light beam, and the third light beam are combined into the main light beam by the light combining device.

3. The linear waveguide display optical system according to claim 1, characterized in that, The reflection imaging device receives the polarized beam output by the polarization beam splitter and reflects the polarized beam to obtain a reflected beam containing image information.

4. The linear waveguide display optical system according to claim 1, characterized in that, The projection device amplifies the reflected light beam carrying image information, thereby increasing the field of view of the image.

5. The linear waveguide display optical system according to claim 1, characterized in that, The optical waveguide device includes an arrayed optical waveguide or a diffractive optical waveguide.

6. An AR glasses, characterized in that, The linear waveguide display optical system includes any one of claims 1 to 5.

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