Optical display device, imaging method and vehicle enhanced display system

Abstract

The invention provides an optical display device, an imaging method and a vehicle enhanced display system, the optical display device is applied to the vehicle enhanced display system, and the optical display device comprises a micro image source display, a collimation optical module and a waveguide transmission module; the micro image source display is used for projecting a virtual image to the collimation optical module; the collimation optical module is used for collimating and amplifying the virtual image to obtain an amplified virtual image; and the waveguide transmission module is used for carrying out two-dimensional pupil expansion transmission on the amplified virtual image and diffracting the amplified virtual image out of the waveguide transmission module to obtain a waveguide image. By means of the optical display device, the problems that due to the fact that a traditional vehicle-mounted HUD system is limited by the technical level and cost, an off-axis lens set optical system is generally adopted in an optical imaging system in the vehicle-mounted HUD system, the structure is complex, the size and weight are large, and the development difficulty is large are solved.

Description

Technical Field

[0001] The present application relates to the technical field of augmented reality, and particularly to an optical display device, an imaging method, and a vehicle-mounted augmented display system. Background Art

[0002] With the popularization of automobiles, traffic safety issues have received increasing attention. An automotive head-up display (HUD) is a visual assistive driving system that can provide key assistive driving information for the driver and project driving information into a virtual image at a certain distance in front of the driver, enabling the driver to obtain information such as vehicle speed, fuel level, and real-time navigation in a head-up state, thereby avoiding the blind spot time caused by the driver looking down at driving information and reducing potential traffic accidents to ensure driving safety.

[0003] However, limited by technical levels and costs, the optical imaging system in a vehicle-mounted HUD system generally adopts an off-axis lens group optical system, making its structure complex, its volume and weight relatively large, and the development difficult.

[0004] Based on the actual needs in the above application scenarios, the present application proposes an optical display device, an imaging method, and a vehicle-mounted augmented display system to solve the problems existing in the current technology. Summary of the Invention

[0005] The present application provides an optical display device, an imaging method, and a vehicle-mounted augmented display system to solve the problem that due to limitations in technical levels and costs, the optical imaging system in a traditional vehicle-mounted HUD system generally adopts an off-axis lens group optical system, making its structure complex, its volume and weight relatively large, and the development difficult.

[0006] In a first aspect of the present application, an optical display device is provided. The optical display device is applied to a vehicle-mounted augmented display system. The display device includes a micro-image source display, a collimation optical module, and a waveguide transmission module. The micro-image source display is used to project a virtual image onto the collimation optical module. The collimation optical module is used to collimate and magnify the virtual image to obtain a magnified virtual image. The waveguide transmission module is used to perform two-dimensional pupil expansion transmission on the magnified virtual image and, after diffracting out of the waveguide transmission module, obtain a waveguide image.

[0007] By adopting the above device, the optical display device is applied to the vehicle-mounted augmented display system. The micro-image source display projects the virtual image onto the collimating optical module, and the collimating optical module collimates and magnifies the virtual image to obtain a magnified virtual image. Due to the magnifying effect of the collimating optical module, the clarity and brightness of the magnified virtual image will be improved. The waveguide transmission module performs two-dimensional pupil expansion transmission on the magnified virtual image, and after diffracting out of the waveguide transmission module, waveguide imaging can be obtained. Due to the transmission effect of the waveguide transmission module, the transmission distance of the magnified virtual image will be farther, enabling the driver to see the virtual image at a farther distance. Furthermore, through two-dimensional pupil expansion transmission of the waveguide transmission module, a wider field of view expansion is achieved, enabling the driver to see more information. Through the above more concise optical display device structure, the problem that the optical imaging system in the traditional in-vehicle HUD system generally uses an off-axis lens group optical system, resulting in a complex structure, large volume and weight, and high development difficulty, is solved.

[0008] Optionally, the waveguide transmission module includes a waveguide plate, an optical coupling input element, and an optical coupling output element. The optical coupling input element is used to receive the input of the magnified virtual image light path and transfer the magnified virtual image into the waveguide plate. The waveguide plate is used to conduct the magnified virtual image light path to the optical coupling output element. The optical coupling output element is used to receive the magnified virtual image light path and diffract the waveguide imaging.

[0009] Optionally, the optical coupling input element is composed of a single reflective volume holographic grating, and the optical coupling output element is composed of a composite of three reflective volume holographic gratings.

[0010] By adopting the above device, compared with the HUD design structure based on traditional geometric optical principles, the imaging technology based on diffractive optical waveguides can make the overall structure thinner and lighter, better reduce the product weight and fit the actual installation and use scenarios. In addition, based on the diffractive optical waveguide, the functions of continuous beam replication and pupil expansion enable the vehicle-mounted augmented display system to achieve a larger pupil range and obtain a larger field of view.

[0011] Optionally, the waveguide transmission module further includes a first turning grating and a second turning grating. The optical coupling input element is composed of a composite of two reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings, and the optical coupling output element is composed of a composite of two other reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings.

[0012] Optionally, the optical coupler input element is configured to obtain a first optical path and a second optical path with orthogonal vector directions after receiving and amplifying the input of the virtual image optical path; the first turning grating is configured to obtain a first turning optical path orthogonal to the vector direction of the first optical path after receiving the input of the first optical path; the second turning grating is configured to obtain a second turning optical path orthogonal to the vector direction of the second optical path after receiving the input of the second optical path; the optical coupler output element is configured to receive the first turning optical path and the second turning optical path to obtain a waveguide image, and the first turning optical path and the second turning optical path form an amplified virtual image optical path.

[0013] By adopting the above device, after the virtual image is collimated and amplified by the collimation optical module and then passes through the optical coupler input element, two reflective volume holographic gratings with orthogonal vector directions of the volume holographic grating respectively transmit two beams of light with orthogonal directions to the first turning grating and the second turning grating on both sides, and then the two turning gratings perform pupil expansion transmission and diffraction transmission to the optical coupler output element, and then the optical coupler output element diffracts the waveguide image, and finally the human eye receives it, so that the final image has better pupil uniformity, better imaging effect, and a larger pupil range.

[0014] Optionally, the waveguide transmission module further includes a third turning grating and a fourth turning grating; the optical coupler output element includes a first optical coupler output sub-element and a second optical coupler output sub-element; the first optical coupler output sub-element includes a left-handed reflective polarization volume holographic grating, and the second optical coupler output sub-element includes a right-handed reflective polarization volume holographic grating; the optical coupler input element is composed of a composite of two reflective polarization volume holographic gratings, including a left-handed reflective polarization volume holographic grating and a right-handed reflective polarization volume holographic grating.

[0015] Optionally, the optical coupler input element is configured to obtain a third optical path and a fourth optical path with opposite vector directions after receiving and amplifying the input of the virtual image optical path; the third turning grating is configured to obtain a third turning optical path orthogonal to the vector direction of the third optical path after receiving the input of the third optical path; the fourth turning grating is configured to obtain a fourth turning optical path orthogonal to the vector direction of the fourth optical path after receiving the input of the fourth optical path; the first optical coupler output sub-element is configured to receive the third turning optical path, and the second optical coupler output sub-element is configured to receive the fourth turning optical path and jointly diffract the waveguide image, and the third turning optical path and the fourth turning optical path form an amplified virtual image optical path.

[0016] By adopting the above device, since the light source generally emitted by the virtual image is natural light, and the natural light contains left-handed polarized light and right-handed polarized light. When the virtual image is collimated and amplified by the collimating optical module and then enters the optical coupling element, the left-handed polarized light and the right-handed polarized light are diffracted into the waveguide transmission module respectively, and then are transmitted to the third turning grating and the fourth turning grating in two directions respectively. Then, the two turning gratings perform pupil expansion transmission and diffractive transmission to the optical coupling output element, and then the optical coupling output element diffracts out of the waveguide for imaging, and finally is received by the human eye; in the above waveguide transmission module, the optical information is transmitted to both sides respectively, so a larger field of view and a broader imaging field of view can be obtained.

[0017] Optionally, the optical coupling output element includes a third optical coupling output sub-element and a fourth optical coupling output sub-element; the third optical coupling output sub-element and the fourth optical coupling output sub-element are respectively located on both sides of the optical coupling input element. Any one of the optical coupling output sub-elements is formed by compounding three reflective polarization volume holographic gratings, constituting two compound reflective polarization volume holographic gratings; among them, the third optical coupling output sub-element is a left-handed compound reflective polarization volume holographic grating, and the fourth optical coupling output sub-element is a right-handed compound reflective polarization volume holographic grating; the optical coupling input element is composed of two compound reflective polarization volume holographic gratings, including a left-handed reflective polarization volume holographic grating and a right-handed reflective polarization volume holographic grating.

[0018] By adopting the above device, when the virtual image is collimated and amplified by the collimating optical module and then enters the optical coupling input element, the left-handed polarized light and the right-handed polarized light are diffracted into the waveguide transmission module respectively, and then are transmitted to the optical coupling output elements on both sides in two directions respectively. Then, the optical coupling output element diffracts out of the waveguide for imaging, and finally is received by the human eye; the structure of the above waveguide transmission module is simpler, the grating diffraction efficiency obtained is higher, and at the same time, it has better imaging picture quality.

[0019] Optionally, the optical display device further includes a protective glass layer; the protective glass layer is attached to the waveguide transmission module and is used for sealing and protecting the surface of the waveguide transmission module.

[0020] The second aspect of the present application provides an imaging method for an optical display device. The method includes: projecting a virtual image to a collimating optical module through a micro-image source display; collimating and amplifying the virtual image through the collimating optical module to obtain an amplified virtual image; performing two-dimensional pupil expansion transmission on the amplified virtual image through the waveguide transmission module, and after diffracting out of the waveguide transmission module, obtaining waveguide imaging.

[0021] The third aspect of the present application provides a vehicle-mounted augmented display system, and the vehicle-mounted augmented display system includes any one of the above optical display devices.

[0022] Compared with the related art, the beneficial effects of the present application are: 1. Through the above more concise optical display device structure, the problem that the optical imaging system in the traditional vehicle-mounted HUD system generally adopts an off-axis lens group optical system, making its structure complex, volume and weight relatively large, and the development difficulty high, is solved.

[0023] 2. Through the above optical display device, based on the polarization two-dimensional vector volume holographic optical waveguide optical display device, the two-dimensional expansion of light is completed, and the optomechanical part is more miniaturized and lightweight; moreover, the polarization two-dimensional vector volume holographic grating has higher diffraction efficiency and better polarization selectivity, making the optical display device in this application have optical advantages such as a large field of view, small volume, and easier integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a vehicle-mounted enhanced display system provided by an embodiment of the present application; Figure 2 is a schematic structural diagram of an optical display device provided by an embodiment of the present application; Figure 3 is a first schematic structural diagram of a waveguide transmission module provided by an embodiment of the present application; Figure 4 is a second schematic structural diagram of a waveguide transmission module provided by an embodiment of the present application; Figure 5 is a third schematic structural diagram of a waveguide transmission module provided by an embodiment of the present application; Figure 6 is a fourth schematic structural diagram of a waveguide transmission module provided by an embodiment of the present application.

[0025] Reference numerals: 10, optical coupling input element; 20, optical coupling output element; 30, waveguide plate; 201, first optical coupling output sub-element; 202, second optical coupling output sub-element; 203, third optical coupling output sub-element; 204, fourth optical coupling output sub-element; 401, first turning grating; 402, second turning grating; 403, third turning grating; 404, fourth turning grating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0027] In the description of the embodiments of the present application, words such as "exemplary", "for example", or "for illustration" are used to indicate examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary", "for example", or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example", or "for illustration" is intended to present relevant concepts in a specific manner.

[0028] In the description of the embodiments of the present application, unless otherwise specified, the term "plural" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "comprise", "include", "have" and their variants all mean "including but not limited to", unless otherwise particularly emphasized in other ways.

[0029] The embodiments of the present application provide a vehicle-mounted enhanced display system, as Figure 1 shown. The vehicle-mounted enhanced display system includes a driving assistance device, a navigation device, an in-vehicle central control device, and an optical display device. The driving assistance device includes a plurality of cameras disposed on the vehicle body for collecting information on the surrounding environment of the vehicle. The navigation device is used to obtain map data and navigation route data. The driving assistance device and the navigation device are each connected to the in-vehicle central control device through a network for communication. When the driving assistance device transmits the collected data, the map data, and the navigation route data obtained by the navigation device to the in-vehicle central control device through the network, the in-vehicle central control device can perform data fusion and processing on the information such as the surrounding environment information of the vehicle, the map data, the navigation route data, and the vehicle body speed, and then generate a prompt or alarm image that fits the real environment in real time, and output a video signal to the optical display device through the network; the optical display device then accurately projects the prompt or alarm virtual image into the real environment, enabling the driver to see the enhanced external environment information of the vehicle, greatly improving the assisted driving ability, driving safety, real-time performance, accuracy, and stability. Some modules can directly utilize the existing hardware modules of the vehicle, and the cost is relatively low.

[0030] In the embodiments of the present application, the driving assistance device is disposed at multiple parts of the vehicle body and is composed of a plurality of cameras for collecting information on the surrounding environment of the vehicle, including the road conditions in front of the vehicle, the objects around the vehicle, lane information, etc. These information will be processed and analyzed by the driving assistance device for assisting the driver in driving.

[0031] In an embodiment of the present application, the navigation device is used to obtain map data and navigation route data. It can perform path planning and navigation based on the current geographical location and destination, and provide real-time navigation information and road condition warnings. The navigation device is connected and communicates with the in-vehicle central control device through a network, and transmits the map data and navigation route data to the in-vehicle central control device.

[0032] In an embodiment of the present application, the in-vehicle central control device is the core part of the system. It receives and processes data from the driving assistance device and the navigation device, and generates prompt or alarm images after fusing these data. These images can be transmitted to the optical display device through the network.

[0033] In an embodiment of the present application, the optical display device is a device used to accurately project the generated prompt or alarm images into the real environment. It can project the images onto the windshield in front of the car or other appropriate parts, so that the driver can see the enhanced out-of-vehicle environment information without lowering their head. This information may include navigation guidance, lane departure warnings, forward obstacle warnings, speed information, etc.

[0034] In addition, the above-mentioned vehicle-mounted augmented display system can also be partially integrated using the existing hardware modules of the vehicle, which can reduce costs and improve the reliability and stability of the system.

[0035] An embodiment of the present application provides an optical display device, and the optical display device is applied in a vehicle-mounted augmented display system, as Figure 2 shown, the display device includes a micro-image source display, a collimating optical module, and a waveguide transmission module; the micro-image source display is used to project a virtual image onto the collimating optical module; the collimating optical module is used to collimate and magnify the virtual image to obtain an enlarged virtual image; the waveguide transmission module is used to perform two-dimensional pupil expansion transmission on the enlarged virtual image, and after diffracting out of the waveguide transmission module, a waveguide imaging is obtained.

[0036] Specifically, as Figure 2 shown, the micro-image source display generally refers to a display with a display unit size in the order of a few millimeters or even a few hundred micrometers. The micro-image source display projects the virtual image to be imaged into the collimating optical module. Through the collimating optical module, the virtual image is collimated and magnified to obtain an enlarged virtual image; the waveguide transmission module is used to perform two-dimensional pupil expansion transmission on the enlarged virtual image, and after diffracting out of the waveguide transmission module, a waveguide imaging is obtained. The waveguide transmission module in the embodiment of the present application is an optical dielectric layer with a certain refractive index and transmittance, and the material can be optical glass or optical resin. The refractive index range of the material is generally between 1.5 and 2.2.

[0037] In a possible implementation manner, as Figure 2As shown, the optical display device further includes a protective glass layer; the protective glass layer is attached to the waveguide transmission module for sealing the surface of the waveguide transmission module.

[0038] In the embodiments of the present application, the protective glass layer can be an optical glass or an optical resin with high transparency and a refractive index close to that of the waveguide material. The protective glass layer and the waveguide transmission module are bonded by a dispensing technique, and the four peripheries are blackened to seal and protect the volume holographic grating thin film layer on the surface of the waveguide transmission module, preventing dust and water, thereby extending the service life of the optical module.

[0039] In a possible implementation manner, as Figure 3 shown, the waveguide transmission module includes an optical coupling input element 10, an optical coupling output element 20, and a waveguide plate 30; the optical coupling input element 10 is used to receive the input of the amplified virtual image light path and transfer the amplified virtual image to the waveguide plate 30; the waveguide plate 30 is used to conduct the amplified virtual image light path to the optical coupling output element 20; the optical coupling output element 20 is used to receive the amplified virtual image light path and diffract the waveguide imaging.

[0040] Specifically, the optical coupling input element 10 is composed of a single reflective volume holographic grating, and the optical coupling output element 20 is composed of a composite of three reflective volume holographic gratings.

[0041] Exemplarily, the optical coupling input element 10 couples light into the waveguide plate 30, and the propagation angle of the light beam coupled into the waveguide plate 30 can satisfy the total reflection condition in the waveguide medium of the waveguide transmission module, and is transmitted forward in the waveguide medium in the form of total reflection to the optical coupling output element 20, and then diffracted out of the waveguide transmission module by the optical coupling output element 20 for imaging, and finally received by the human eye.

[0042] In a possible implementation manner, as Figure 4 shown, the waveguide transmission module further includes a first turning grating 401 and a second turning grating 402; the optical coupling input element 10 is composed of a composite of two reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings, and the optical coupling output element 20 is composed of a composite of two other reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings.

[0043] Specifically, the optical coupling input element 10 is formed by a composite of two reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings. As Figure 4 shown, there are two turning gratings on the right side and below the optical coupling input element 10. These two turning gratings are reflective volume holographic gratings, and their grating vector directions are also orthogonal. The optical coupling output element 20 is also formed by a composite of two reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings.

[0044] Exemplarily, the optical coupler input element 10 is configured to obtain a first optical path and a second optical path with orthogonally opposite vector directions after receiving and amplifying the input of the virtual image optical path; the first turning grating 401 is configured to obtain a first turning optical path with a vector direction orthogonal to that of the first optical path after receiving the input of the first optical path; the second turning grating 402 is configured to obtain a second turning optical path with a vector direction orthogonal to that of the second optical path after receiving the input of the second optical path; the optical coupler output element 20 is configured to obtain a waveguide image after receiving the first turning optical path and the second turning optical path, and the first turning optical path and the second turning optical path form an amplified virtual image optical path. Compared with Figure 3 the embodiment, it has better exit pupil uniformity, better imaging effect, and a larger exit pupil range.

[0045] In a possible implementation manner, as Figure 5 shown, the waveguide transmission module further includes a third turning grating 403 and a fourth turning grating 404; the optical coupler output element 20 includes a first optical coupler output sub-element 201 and a second optical coupler output sub-element 202; the first optical coupler output sub-element 201 includes a left-handed reflective volume holographic grating, and the second optical coupler output sub-element 202 includes a right-handed reflective volume holographic grating; the optical coupler input element 10 is composed of two composite reflective volume holographic gratings, including a left-handed reflective volume holographic grating and a right-handed reflective volume holographic grating.

[0046] In an embodiment of the present application, the optical coupler input element 10 is formed by stacking and compounding two reflective volume holographic gratings, including a left-handed reflective volume holographic grating and a right-handed reflective volume holographic grating.

[0047] Specifically, as Figure 5 shown, there are two turning gratings, namely a third turning grating 403 and a fourth turning grating 404, on both sides of the optical coupler input element 10. These two turning gratings are reflective volume holographic gratings, and their grating vector directions are opposite. Below the two turning gratings are the first optical coupler output sub-element 201 and the second optical coupler output sub-element 202, which are a left-handed reflective volume holographic grating and a right-handed reflective volume holographic grating respectively.

[0048] Exemplarily, as Figure 5As shown, the optical coupler input element 10 is used to obtain a third optical path and a fourth optical path with opposite vector directions after receiving and amplifying the input of the virtual image optical path; the third turning grating 403 is used to receive the input of the third optical path and obtain a third turning optical path orthogonal to the vector direction of the third optical path; the fourth turning grating 404 is used to receive the input of the fourth optical path and obtain a fourth turning optical path orthogonal to the vector direction of the fourth optical path; the first optical coupler output sub-element 201 is used to receive the third turning optical path, and the second optical coupler output sub-element 202 is used to receive the fourth turning optical path, and jointly diffract to form a waveguide image. The third turning optical path and the fourth turning optical path constitute an amplified virtual image optical path. Since the light source generally emitted by the micro image source is natural light, and natural light contains left-handed polarized light and right-handed polarized light, when the micro image source is collimated and amplified by the collimating optical system and then passes through the optical coupler input element 10, the left-handed polarized light and the right-handed polarized light are diffracted into the waveguide respectively, and then are transmitted to the turning gratings on both sides in two directions respectively, and then the turning gratings perform pupil expansion transmission and diffraction transmission to the optical coupler output element 20, and then the optical coupler output element 20 diffracts to form a waveguide image, and finally is received by the human eye. Compared with Figure 4 the embodiment in Figure 5 where the optical information is transmitted to both sides respectively, a larger field of view and a wider imaging field of view can be obtained.

[0049] In a possible implementation manner, as shown in Figure 6 the optical coupler output element 20 includes a third optical coupler output sub-element 203 and a fourth optical coupler output sub-element 204; the third optical coupler output sub-element and the fourth optical coupler output sub-element are respectively located on both sides of the optical coupler input element 10. Any one of the optical coupler output sub-elements is formed by compounding three reflective polarization volume holographic gratings. The third optical coupler output sub-element is a left-handed composite reflective polarization volume holographic grating, and the fourth optical coupler output sub-element is a right-handed composite reflective polarization volume holographic grating; the optical coupler input element 10 is composed of two reflective polarization volume holographic gratings compounded, including a left-handed reflective polarization volume holographic grating and a right-handed reflective polarization volume holographic grating.

[0050] Specifically, as shown in Figure 6 the optical coupler input element 10 is formed by stacking and compounding two reflective polarization volume holographic gratings, including a left-handed reflective polarization volume holographic grating and a right-handed reflective polarization volume holographic grating. The optical coupler output element 20 is respectively located on both sides of the optical coupler input element 10, and is formed by compounding two reflective polarization volume holographic gratings with three different vector directions of volume holographic gratings. The two compound reflective polarization volume holographic gratings are respectively a left-handed composite reflective polarization volume holographic grating and a right-handed composite reflective polarization volume holographic grating. Compared with Figure 5 the embodiment in Figure 6 the structure is simpler, the grating diffraction efficiency is higher, and the imaging picture quality is better.

[0051] By adopting the above embodiments, the beneficial effects that can be achieved by this application include one or more of the following: 1. Through the above more concise optical display device structure, the problem that the optical imaging system in the traditional in-vehicle HUD system generally uses an off-axis lens group optical system, resulting in a complex structure, large volume and weight, and high development difficulty, is solved.

[0052] 2. Through the above optical display device, based on the polarization two-dimensional vector volume holographic waveguide optical display device, the two-dimensional expansion of light is completed, and the optomechanical part is more miniaturized and lightweight; moreover, the polarization two-dimensional vector volume holographic grating has higher diffraction efficiency and better polarization selectivity, making the optical display device in this application have the optical advantages of a large field of view, small volume, and easier integration.

[0053] The embodiment of this application provides an imaging method for an optical display device. The method includes: projecting a virtual image onto a collimating optical module through a micro-image source display; collimating and magnifying the virtual image through the collimating optical module to obtain a magnified virtual image; performing two-dimensional pupil expansion transmission on the magnified virtual image through a waveguide transmission module, and obtaining a waveguide image after diffracting out of the waveguide transmission module.

[0054] It should be noted that: when the device provided in the above embodiment realizes its functions, only the above-mentioned division of each functional module is used for illustration. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiment belong to the same concept. For the specific implementation process, please refer to the device embodiment, which will not be elaborated here.

[0055] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] In several embodiments provided by this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection between each other can be through some service interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.

[0057] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0058] In addition, in each embodiment of the present application, each functional unit can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0059] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to enable a computer device, which can be a personal computer, a server, or a network device, etc., to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned memory includes various media such as USB flash drives, mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0060] The above are only exemplary embodiments of the present disclosure and should not be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. After considering the specification and the disclosure of the practical truth, those skilled in the art will easily think of other implementation schemes of the present disclosure. The present application aims to cover any variations, uses, or adaptive changes of the present disclosure, and these variations, uses, or adaptive changes follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not recorded in the present disclosure.

Claims

1. An optical display device, which is applied to a vehicle-mounted augmented display system, and is characterized in that, The display device includes a micro-image source display, a collimating optical module, a waveguide transmission module, and a protective glass layer; The micro-image source display is configured to project a virtual image onto the collimating optical module; The collimating optical module is configured to collimate and magnify the virtual image to obtain a magnified virtual image; The waveguide transmission module is configured to perform two-dimensional pupil expansion transmission on the magnified virtual image and diffract it out of the waveguide transmission module to obtain a waveguide image; The protective glass layer is attached to the waveguide transmission module and is configured to hermetically protect the surface of the waveguide transmission module.

2. The optical display device according to claim 1, wherein The waveguide transmission module includes an optical coupling input element (10), an optical coupling output element (20), and a waveguide plate (30); The optical coupling input element (10) is configured to receive the input of the magnified virtual image optical path and transfer the magnified virtual image into the waveguide plate (30); The waveguide plate (30) is configured to conduct the magnified virtual image optical path to the optical coupling output element (20); The optical coupling output element (20) is configured to receive the magnified virtual image optical path and diffract the waveguide image.

3. The optical display device according to claim 2, characterized in that, The optical coupling input element (10) is composed of a single reflective volume holographic grating, and the optical coupling output element (20) is composed of a composite of three reflective volume holographic gratings.

4. The optical display device according to claim 2, wherein, The waveguide transmission module further includes a first turning grating (401) and a second turning grating (402); The optical coupling input element (10) is composed of a composite of two reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings, and the optical coupling output element (20) is composed of a composite of two other reflective volume holographic gratings with orthogonal vector directions of the volume holographic gratings.

5. The optical display device according to claim 2, wherein, The waveguide transmission module further includes a third turning grating (403) and a fourth turning grating (404); the optical coupling output element (20) includes a first optical coupling output sub-element (201) and a second optical coupling output sub-element (202); The first optical coupling output sub-element (201) includes a left-handed reflective polarization volume holographic grating, and the second optical coupling output sub-element (202) includes a right-handed reflective polarization volume holographic grating; The optical coupling input element (10) is composed of a composite of two reflective polarization volume holographic gratings, including a left-handed reflective polarization volume holographic grating and a right-handed reflective polarization volume holographic grating.

6. The optical display device according to claim 4, characterized in that, The optical coupling input element (10) is configured to, after receiving the input of the magnified virtual image optical path, obtain a first optical path and a second optical path with orthogonal vector directions; The first turning grating (401) is configured to receive the input of the first optical path and obtain a first turning optical path with a vector direction orthogonal to that of the first optical path; The second turning grating (402) is configured to receive the input of the second optical path and obtain a second turning optical path with a vector direction orthogonal to that of the second optical path; The optical coupling output element (20) is configured to receive the first turning optical path and the second turning optical path to obtain the waveguide image, and the first turning optical path and the second turning optical path constitute the magnified virtual image optical path.

7. The optical display device according to claim 5, characterized in that, The optical coupler input element (10) is configured to obtain a third optical path and a fourth optical path with opposite vector directions after receiving the input of the amplified virtual image optical path; The third turning grating (403) is configured to obtain a third turning optical path orthogonal to the vector direction of the third optical path after receiving the input of the third optical path; The fourth turning grating (404) is configured to obtain a fourth turning optical path orthogonal to the vector direction of the fourth optical path after receiving the input of the fourth optical path; The first optical coupler output sub-element (201) is configured to receive the third turning optical path, and the second optical coupler output sub-element (202) is configured to receive the fourth turning optical path, and jointly diffract the waveguide imaging. The third turning optical path and the fourth turning optical path constitute the amplified virtual image optical path.

8. The optical display device according to claim 2, wherein The optical coupler output element (20) includes a third optical coupler output sub-element (203) and a fourth optical coupler output sub-element (204); The third optical coupler output sub-element (203) and the fourth optical coupler output sub-element (204) are respectively located on both sides of the optical coupler input element (10). Any one of the optical coupler output sub-elements is formed by compounding three reflective polarization volume holographic gratings. The third optical coupler output sub-element (203) is a left-handed compound reflective polarization volume holographic grating, and the fourth optical coupler output sub-element (204) is a right-handed compound reflective polarization volume holographic grating; The optical coupler input element (10) is composed of two compounded reflective polarization volume holographic gratings, including a left-handed reflective polarization volume holographic grating and a right-handed reflective polarization volume holographic grating.

9. An imaging method for an optical display device, characterized in that, The method includes: Projecting a virtual image to the collimating optical module through a micro-image source display; Collimating and amplifying the virtual image through the collimating optical module to obtain an amplified virtual image; Performing two-dimensional pupil expansion transmission on the amplified virtual image through the waveguide transmission module, and obtaining waveguide imaging after diffracting out of the waveguide transmission module.

10. A vehicle-mounted enhanced display system, characterized in that, The system includes the optical display device according to any one of claims 1-7.

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