Display device and vehicle

Abstract

The present application provides a display device, which can be applied to a head-up display device in a vehicle. The display device comprises: a projection module, a waveguide in-coupling module, an optical waveguide, and a windshield correction element. The projection module is configured to project image light to the waveguide in-coupling module. The waveguide in-coupling module is configured to in-couple the image light from the projection module into the optical waveguide and compensate a color difference value of the windshield correction element. The optical waveguide is configured to emit the image light from the waveguide in-coupling module to the windshield correction element. The windshield correction element is configured to adjust the transmission angle and / or the transmission direction of the image light from the optical waveguide and emit the adjusted image light to a windshield. The display device provided by the present application can compensate the color difference of the windshield correction element, so as to achieve the purpose of improving the imaging quality.

Description

Display device and vehicle

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 4, 2023, with application number 202311655074.4, and priority to the Chinese patent application entitled "A Display Device and a Vehicle", all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the fields of display technology and intelligent automobile driving technology, and more particularly, to a display device and a vehicle. Background Art

[0003] Cars have become an indispensable means of transportation in our daily lives. As the number of cars increases, the frequency of traffic accidents is also increasing. To improve driving safety, head-up displays (HUDs), particularly augmented reality head-up displays (AR-HUDs), have become a hot research topic.

[0004] To reduce HUD size, new HUDs that use waveguides to transmit image light have become a research focus. Waveguide HUD solutions typically require the placement of corrective elements along the waveguide's light output path to compensate for issues like image distortion caused by the windshield. However, it's worth noting that using a single corrective element can introduce additional chromatic aberration into the HUD system, also degrading image quality. Using multiple components increases the size of the HUD system and the cost.

[0005] Therefore, how to use a single element to correct the image quality degradation caused by the windshield while eliminating the chromatic aberration introduced by the single correction element is a problem that needs to be solved. Summary of the Invention

[0006] The present application provides a display device and a vehicle. The display device provided by the present application is small in size and has good imaging quality.

[0007] In a first aspect, embodiments of the present application provide a display device. The display device includes: a projection module, a waveguide coupling module, an optical waveguide, and a windshield correction element. The projection module is configured to project image light onto the waveguide coupling module; the waveguide coupling module is configured to couple the image light from the projection module into the optical waveguide and compensate for chromatic aberration of the windshield correction element; the optical waveguide is configured to transmit the image light from the waveguide coupling module to the windshield correction element; and the windshield correction element is configured to adjust the transmission angle and / or transmission direction of the image light from the optical waveguide and transmit the adjusted image light toward the windshield.

[0008] Based on the above solution, the display device provided by this application can compensate for the chromatic aberration of the windshield correction element, thereby improving image quality and enhancing the user experience. Furthermore, in this application, the windshield correction element is a single component rather than a combined system, which can also reduce the size of the display device.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the color difference value Δθ of the windshield correction element is CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfy: -3mrad≤(Δθ CF1 +Δθ CF2 )≤3mrad, where Δθ CF1 The angle deviation between the C light and the F light corresponding to the windshield correction element at the maximum viewing angle θ is Δθ. CF2 It represents the angular deviation between the C light and the F light corresponding to the waveguide coupling module at the maximum field of view angle θ. The wavelength of the C light is 656nm, and the wavelength of the F light is 486nm. mrad is the unit of measurement, and Δθ CF1 and Δθ CF2 The signs are opposite.

[0010] Based on the above color difference range, the display device provided in this application has a small system color difference and good imaging quality.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the optical power Φ1 of the windshield and the optical power Φ2 of the windshield correction element satisfy: -0.5m- 1 ≤(Φ1+Φ2)≤0.5m- 1 .

[0012] Based on the display device provided in the present application, the optical focal length of the windshield correction element can compensate for the optical focal length of the windshield glass, so that the system's small optical focal length range is within a smaller range, thereby achieving the purpose of improving imaging quality.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the color difference value Δθ of the windshield correction element is CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfy: (Δθ CF1 +Δθ CF2 )=0.3mrad.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the optical power Φ1 of the windshield and the optical power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=0.05m- 1 .

[0015] In combination with the first aspect, in certain implementations of the first aspect, the windshield corrective element is a lens whose surface type is an extended polynomial, and the waveguide coupling module includes a plurality of lenses.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the waveguide coupling module includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence along the transmission direction of the image light, and the second lens is a doublet lens.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the color difference value Δθ of the windshield correction element is CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfy: (Δθ CF1 +Δθ CF2 )=-0.6mrad.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the optical power Φ1 of the windshield and the optical power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=0.13m- 1 .

[0019] In combination with the first aspect, in certain implementations of the first aspect, the windshield correction element is a Fresnel lens, and the waveguide coupling module includes multiple lenses and at least one reflector.

[0020] In combination with the first aspect, in some implementations of the first aspect, the waveguide coupling module includes a first lens, a second lens, a first reflector, and a second reflector arranged in sequence along the transmission direction of the image light, and the first lens is a doublet lens.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the color difference value Δθ of the windshield correction element is CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfy: (Δθ CF1 +Δθ CF2)=1.8mrad.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the optical power Φ1 of the windshield and the optical power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=0.4m- 1 .

[0023] In combination with the first aspect, in certain implementations of the first aspect, the windshield correction element is a transmissive grating, and the waveguide coupling module includes a plurality of lenses and a reflective grating.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the waveguide coupling module includes a first lens, a second lens, and a reflective grating arranged in sequence along a transmission direction of the image light, and the first lens is a doublet lens.

[0025] In combination with the first aspect, in certain implementations of the first aspect, the color difference value Δθ of the windshield correction element is CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfy: (Δθ CF1 +Δθ CF2 )=-1.6mrad.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the optical power Φ1 of the windshield and the optical power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=-0.07m- 1 .

[0027] In combination with the first aspect, in certain implementations of the first aspect, the windshield correction element is a lens whose surface type is an extended polynomial, and the waveguide coupling module includes at least one lens, at least one reflector, and a transmissive grating.

[0028] In combination with the first aspect, in some implementations of the first aspect, the waveguide coupling module includes a first lens, a first reflector, and a transmission grating arranged in sequence along a transmission direction of the image light.

[0029] In combination with the first aspect, in certain implementations of the first aspect, the windshield correction element is also used as a dust cover for the display device.

[0030] In combination with the first aspect, in certain implementations of the first aspect, the display device further includes a dust cover, and the windshield correction element is fixed to the dust cover as a whole.

[0031] In a second aspect, an embodiment of the present application provides a vehicle-mounted system, which includes the display device and an instrument panel according to the first aspect and any possible implementation of the first aspect, wherein the display device is installed in the instrument panel.

[0032] In a third aspect, embodiments of the present application provide a vehicle, which includes the display device and windshield according to the first aspect and any possible implementation of the first aspect, or includes the cockpit system according to the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic diagram of an application scenario of a HUD device provided in an embodiment of the present application.

[0034] FIG2 is a schematic structural diagram of a display device 200 provided in an embodiment of the present application.

[0035] FIG3 shows a possible structure of the projection module 201 provided in an embodiment of the present application.

[0036] FIG. 4 shows a possible structure of a projection module 201 in which the modulation module 312 is a DMD according to an embodiment of the present application.

[0037] FIG5 is a schematic structural diagram of an optical imaging system 50 composed of a first display device 500 provided in an embodiment of the present application.

[0038] FIG6 is a schematic structural diagram of an optical imaging system 60 composed of a second display device 600 provided in an embodiment of the present application.

[0039] FIG7 is a schematic structural diagram of an optical imaging system 70 composed of a third display device 700 provided in an embodiment of the present application.

[0040] FIG8 is a schematic structural diagram of an optical imaging system 80 composed of a fourth display device 800 provided in an embodiment of the present application.

[0041] FIG9 is a circuit diagram of a display device provided in an embodiment of the present application.

[0042] FIG10 is a schematic diagram of a possible functional framework of a vehicle provided in an embodiment of the present application.

[0043] FIG11 is a schematic functional block diagram of a mobile carrier 1100 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0045] In order to facilitate understanding of the embodiments of the present application, the following explanations are provided.

[0046] First, the terms "first," "second," and various numbers in the following descriptions or drawings of the embodiments of the present application are merely for convenience of description and are not necessarily used to describe a specific order or sequence, and are not intended to limit the scope of the embodiments of the present application. For example, to distinguish between different lenses, etc.

[0047] Second, the terms "including" and "having" and any variations thereof in the embodiments of the present application shown below are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0048] Third, in the embodiments of this application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. An embodiment or design described as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. The use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete manner to facilitate understanding.

[0049] Fourth, in the embodiment of the present application, image light refers to light carrying an image (or image information) and is used to generate an image.

[0050] Fifth, in the drawings of this application, the thickness, size, and shape of various optical components are slightly exaggerated for ease of illustration. Specifically, the shapes of the optical components shown in the drawings are provided by way of example. For example, the shapes of the curved mirrors in this application are not limited to the spherical or aspherical shapes shown in the drawings. Furthermore, the drawings are for illustrative purposes only and are not drawn strictly to scale.

[0051] Sixth, unless otherwise defined, all terms (including technical and scientific terms) used in this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0052] Seventh, this application relates to optical waveguides. Optical waveguides can generally be divided into two types: geometric waveguides and diffractive waveguides. Geometric waveguides mainly include array waveguides and sawtooth waveguides. Diffractive waveguides mainly include surface relief grating waveguides manufactured using photolithography technology and volumetric holographic grating waveguides manufactured using holographic interferometry technology.

[0053] Eighth, in this application, the thickness and radius of some optical components are given in a table. It should be understood that the different precision values ​​of these values ​​should also be within the scope of protection of this application. For example, when the optical component is a lens, and the surface radius of the lens given in the table is 29.98m, the embodiments of this application also protect the surface radius of the lens as 29.9810mm or 30mm. In addition, values ​​near 29.98m or approximate values ​​of 29.98m are also within the scope of protection of this application. Here, approximate refers to the use of methods such as rounding or rounding up or down.

[0054] Ninth, this application relates to focal power. In an optical system, focal power is used to measure the system's ability to converge or diverge light. An optical system with positive focal power converges light. Conversely, an optical system with negative focal power diverges light.

[0055] FIG1 is a schematic diagram of an application scenario of the HUD device provided in an embodiment of the present application. As shown in FIG1 , the HUD device is provided on a car. The HUD device is used to project the vehicle's status information, indication information of external objects, and navigation information into the driver's field of view through the vehicle's windshield (also referred to as a windshield). Status information includes but is not limited to information such as driving speed, mileage, fuel level, water temperature, and headlight status. Information indicating external objects includes but is not limited to safe vehicle distance, surrounding obstacles, and reversing images. Navigation information includes but is not limited to direction arrows, distance, and driving time.

[0056] Among them, the virtual images corresponding to the navigation information and the indication information of external objects can be superimposed on the real environment outside the vehicle, so that the driver can obtain the visual effects of augmented reality, such as augmented reality (AR) navigation, adaptive cruise, lane departure warning, etc. Since the virtual image corresponding to the navigation information can be combined with the real scene, the HUD device is usually coordinated with the advanced driving assistant system (ADAS) system of the car. In order not to interfere with the road conditions, the virtual image corresponding to the instrument information is usually about 2 to 3 meters away from the human eye. In order to better integrate the virtual image corresponding to the navigation information with the real road surface, the virtual image corresponding to the navigation information is generally about 7 to 15 meters away from the human eye. Among them, the position where the virtual image of the navigation information is located is called the far focal plane, and the plane where the virtual image of the instrument information is located is called the near focal plane.

[0057] Currently, research on HUDs focuses on reducing device size. One effective approach to reducing HUD size is to use optical waveguides as the medium for image light transmission. In this approach, image light enters the waveguide through its incoupling region and then exits through its outcoupling region in a parallel direction through total internal reflection. It then passes through the windshield and enters the human eye, resulting in a virtual image. In this approach, the waveguide only transmits the image light and generally does not perform any "work" on the image itself (such as magnification or reduction). This can be understood as "parallel light in, parallel light out." However, due to the varying curvature of the windshield at different locations, the direction and / or angle of the image light reflected into the eye change, making it no longer parallel, resulting in poor image quality. Therefore, in optical waveguide HUD systems, a corrective element is also required above the waveguide outcoupling region to compensate for image quality degradation caused by the windshield. However, a single corrective element introduces additional systemic chromatic aberration to the HUD system, while combining corrective elements increases the size of the HUD device.

[0058] In view of this, the present application proposes a display device that can compensate for the chromatic aberration introduced by the correction element for correcting the curvature of the windshield, thereby achieving the purpose of improving the imaging quality and realizing the effect of enhancing the user experience.

[0059] FIG2 is a schematic structural diagram of a display device 200 provided in an embodiment of the present application. As shown in FIG2 , the display device 200 includes a projection module 201, a waveguide coupling module 202, an optical waveguide 203, and a windshield correction element 204. The projection module 201 is configured to project image light onto the waveguide coupling module 202. The waveguide coupling module 202 is configured to couple the image light from the projection module 201 into the optical waveguide 203 and to compensate for the chromatic aberration of the windshield correction element 204. The optical waveguide 203 is configured to transmit the image light from the waveguide coupling module 202 to the windshield correction element 204. The windshield correction element 204 is configured to adjust the transmission angle and / or transmission direction of the image light from the optical waveguide and to transmit the adjusted image light toward the windshield.

[0060] It is understood that the image light emitted by the optical waveguide 203 is approximately parallel light. Therefore, when the display device 200 does not include the windshield correction element 204, the approximately parallel light emitted by the optical waveguide 203 is no longer approximately parallel light after being reflected by the windshield, which has a varying curvature. This causes distortion and other degradation of the image perceived by the human eye. Therefore, to eliminate the deterioration of image quality caused by the windshield, the windshield correction element 204 is positioned in front of the windshield. This deflects the image light by adjusting its propagation angle and / or direction. When the deflected image light is deflected again by the windshield, the emitted light becomes approximately parallel light, thus eliminating the impact of the windshield on image quality. It should be noted that the deflection effect of the windshield corrective element 204 and the windshield on the image light can be measured by different parameters, such as the focal length of the windshield corrective element 204 or the windshield itself, the refractive index, the distance between the windshield corrective element 204 and the windshield, the respective optical focal lengths of the windshield corrective element 204 and the windshield, and the optical focal length of the combined system composed of the windshield corrective element 204 and the windshield. In the present application, the optical focal length is used as an example to illustrate the parameter for measuring the correction effect. Specifically, in the present application, the optical focal length of the combined system of the windshield corrective element 204 and the windshield is designed to be approximately 0, so as to reflect the correction effect of the windshield corrective element 204 on the windshield. Optionally, the optical focal length Φ1 of the windshield and the optical focal length Φ2 of the windshield corrective element satisfy: -0.5m -1 ≤(Φ1+Φ2)≤0.5m -1 .

[0061] It should be noted that the image light incident on the windshield corrective element 204 contains light of different wavelengths. When these multiple wavelengths of light pass through the windshield corrective element 204, the windshield corrective element 204 deflects the light of different wavelengths differently, causing the different wavelengths to be unable to focus on the same plane. In severe cases, this can cause color fringing in the generated displayed image, affecting the user's viewing experience. Therefore, the present application compensates for the chromatic dispersion of the windshield corrective element 204 through the waveguide coupling module 202. Specifically, in the present application, the chromatic aberration of the waveguide coupling module 202 is designed so that the chromatic aberration value of the waveguide coupling module 202 is close to the chromatic aberration value of the windshield corrective element 204, but in opposite directions. This ensures that the chromatic aberration of the combined system formed by the waveguide coupling module 202 and the windshield corrective element 204 is close to zero, thereby achieving chromatic aberration compensation. Optionally, when using C light and F light to represent the chromatic aberration value, in the display device 200 provided by the present application, the chromatic aberration value Δθ of the windshield corrective element 204 is CF1 and the color difference Δθ of the waveguide coupling module 202 CF2 The following relationship is satisfied: -3mrad≤(Δθ CF1 +Δθ CF2 )≤3mrad.

[0062] Where Δθ CF1 The angle deviation between the C light and the F light corresponding to the windshield correction element 204 at the maximum viewing angle θ is Δθ. CF2 represents the angular deviation between the C light and the F light corresponding to the waveguide coupling module 202 at the maximum field of view angle θ. The wavelength of the C light is 656nm, and the wavelength of the F light is 486nm. mrad is the unit of measurement, and Δθ CF1 and Δθ CF2 The signs are opposite.

[0063] Generally speaking, the chromatic aberration of the windshield correction element 204 is within a certain range. Therefore, in the present application, the chromatic aberration value of the waveguide coupling module 202 can be designed to compensate for the median value of the chromatic aberration of the windshield correction element 204. Therefore, when the display device of the present application is applied to different vehicle models, customized development for each vehicle model is not necessary, thereby achieving the purpose of reducing development costs.

[0064] It should be noted that the present application does not limit the type and quantity of optical elements in the waveguide coupling module 202. For example, the waveguide coupling module 202 can be composed of multiple lenses, or composed of at least one lens and at least one reflector, or composed of at least one lens and a grating, or composed of at least one lens, at least one reflector and a grating, etc.

[0065] In addition, in order not to increase the volume of the display device 200, in the present application, the windshield correction element 204 is a single non-combined element. For example, the windshield correction element 204 can be a transmission diffraction grating, a free-form mirror, a Fresnel lens, etc., which is not limited in the present application.

[0066] It should also be noted that the present application does not limit the type of optical waveguide 203. It can be a geometric optical waveguide, such as a sawtooth optical waveguide and an array optical waveguide, or a diffraction optical waveguide, such as a surface relief optical waveguide and a volume holographic optical waveguide (also referred to as a volume holographic optical waveguide). It is understandable that the above examples are only common optical waveguides currently available. Other new optical waveguides resulting from future technological developments may also be applicable to the solutions of the present application. Optionally, the material of the optical waveguide 203 is inorganic optical glass, such as borosilicate glass BK7. Alternatively, the material of the optical waveguide 203 is thermoplastic plastic, such as polypropylene (PP), polymethyl methacrylate (PMMA), polycarbonate (PC), etc., which is not limited in the present application.

[0067] In the embodiment of the present application, the projection module 201 can adopt a liquid crystal on silicon (Liquid Crystal On Silicon, LCoS) display, an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display, a liquid crystal display (Liquid Crystal Display, LCD), a digital light processing (Digital Light Procession, DLP) display, a micro-electromechanical system (Micro-Electro-Mechanical Systems, MEMS) display, an organic light-emitting diode (organic light-emitting diode, OLED) display, a micro light-emitting diode (Micro-LED) display, a display using mini LED display technology, etc., and this application does not limit it.

[0068] As an example, Figure 3 illustrates a possible structure of a projection module 201 provided in an embodiment of the present application. Projection module 201 includes a light source 311, a modulation module 312, and a projection device 313. Depending on the display technology employed by projection module 201, modulation module 312 can be an LCoS modulator, a DMD, or a transmissive spatial light modulator (LCD). For example, when modulation module 312 is an LCoS modulator, light source 311 can be a red, green, or blue light emitting diode (LED) light source, which together with the LCoS modulator forms an LCoS display. When modulation module 312 is a DMD, it can be a MEMS-controlled DMD modulator, combined with a laser or LED light source to form a DLP display. Alternatively, when modulation module 312 is an LCD modulator, light source 311 can be a linear light source composed of red, green, and blue cold cathode fluorescent tubes, which together with the LCD modulator form an LCD display. Projection device 313 can be a projection lens.

[0069] Optionally, to improve projection quality and / or reduce the volume of the projection module 201, in some embodiments, the projection module 201 further includes a refraction module 314, or the projection module 201 further includes a polarization conversion module 314. When the projection module 201 includes the refraction module 314, the refraction module 314 can be one or more lenses (for focusing the energy of the light beam to ensure the energy of the light beam, or for diffusing the light spot to increase the projection field of view), and / or one or more prisms (for folding the light path to reduce the volume of the projection module), etc., and this application does not limit this. When the projection module 201 includes the polarization conversion module 314, the polarization conversion module 314 is used to change the polarization state of the image light.

[0070] As an example, FIG4 shows a possible structure of a projection module 201 in which the modulation module 312 provided in an embodiment of the present application is a DMD. As shown in FIG4 , the light source 311 includes a first monochromatic light array 411, a second monochromatic light array 412, a third monochromatic light array 413, dichroic filters 421 and 422, and a lens group 430. The refractive module 314 is a prism. Among them, the three monochromatic light arrays can respectively correspond to monochromatic light of the three primary colors, including red light, blue light, and green light. In order to improve the utilization rate of light energy, in some embodiments, a collimating lens can be further arranged after the monochromatic light array, such as the collimating lens 4111, the collimating lens 4112, and the collimating lens 4113 in FIG4 . Specifically, when the projection module 201 is working, the first monochromatic light array 411, the second monochromatic light array 412, and the third monochromatic light array 413 respectively emit corresponding monochromatic lights. The three monochromatic lights pass through the dichroic filters 421 and 422 and are incident on the lens group 430. After being emitted from the lens group 430, they are incident on the DMD through the prism. The DMD modulates the input light beam based on the data information of the input image and outputs image light. The image light is incident on the projection device 313 after transmitting through the prism, and then passes through the projection device 313 to emit the image light to the waveguide coupling module 202.

[0071] It is understood that when the display device 200 functions as a HUD display device, it also includes a housing for protecting the projection module 201, waveguide coupling module 202, optical waveguide 203, and windshield correction element 204. The housing can be made of plastic, metal, or a combination of plastic and metal. Furthermore, the display device 200 also includes a dust cover. In one embodiment, the windshield correction element 204 also serves as a dust cover for the display device 200. In this case, the dimensions of the windshield correction element 204 are comparable to those of the dust cover reserved on the housing. In another embodiment, the windshield correction element 204 can be fixed integrally with the dust cover, for example, by affixing the windshield correction element 204 to the dust cover using transparent optical adhesive.

[0072] It can also be understood that the display device provided in the embodiment of the present application can be installed in an instrument panel (IP) of a vehicle.

[0073] Based on the description of Figure 2 above, the following, in combination with Figures 5 to 8, respectively illustrate specific embodiments of the optical imaging system 50 composed of the first display device 500, the optical imaging system 60 composed of the second display device 600, the optical imaging system 70 composed of the third display device 700, and the optical imaging system 80 composed of the fourth display device 800 provided in the embodiments of the present application.

[0074] FIG5 is a schematic diagram of the structure of an optical imaging system 50 comprising a first display device 500 according to an embodiment of the present application. Specifically, the optical imaging system 50 includes a display device 500 and a windshield 510. The display device 500 includes a projection module 501, a waveguide coupling module 502, a surface relief optical waveguide 503, and a windshield correction lens 504. The surface type of the windshield correction lens 504 is an extended polynomial. The waveguide coupling module 502 includes a first lens 521, a second lens 522, a third lens 523, a fourth lens 524, and a fifth lens 525, arranged in sequence along the transmission direction of the image light. The second lens 522 is a doublet.

[0075] Specifically, when the optical imaging system 50 is working, the projection module 501 emits image light to the waveguide coupling module 502. After the image light is transmitted through the first lens 521, the second lens 522, the third lens 523, the fourth lens 524 and the fifth lens 525 in sequence, it is coupled into the surface relief optical waveguide 503 from the coupling area of ​​the surface relief optical waveguide 503. After being transmitted in the surface relief optical waveguide 503, it is emitted from the coupling area of ​​the surface relief optical waveguide 503 to the windshield correction lens 504, and then transmitted to the surface of the windshield 510, and is reflected by the windshield 510 into the human eye.

[0076] For example, Table 1 shows relevant optical data of the windshield correction lens 504 .

[0077] Table 1

[0078] For example, Table 2 shows relevant optical data of the waveguide incoupling module 502 .

[0079] Table 2

[0080] It should be noted that in the embodiment of the present application, the absolute value of the curvature radius R represents the size of the curvature radius of the corresponding surface, and the positive and negative signs indicate the bending direction of the corresponding surface. When the center of the sphere corresponding to the curvature radius is located on the left side of the vertex of the sphere, the sign of the curvature radius of the sphere is negative; when the center of the sphere corresponding to the curvature radius is located on the right side of the vertex of the sphere, the sign of the curvature radius of the sphere is positive.

[0081] It should also be noted that the data in Tables 1 and 2 above are not exact values ​​but only approximate values.

[0082] It can be understood that the curvature radius in Tables 1 and 2 is infinite, which is an ideal design. In actual processing, the curvature radius caused by processing errors may differ from the ideal curvature radius.

[0083] In the optical imaging system 50 shown in FIG5 , the chromatic aberration value Δθ of the windshield correction lens 504 isCF1 and the color difference Δθ of the waveguide coupling module 502 CF2 Satisfy: (Δθ CF1 +Δθ CF2 )=0.3mrad. The optical power Φ1 of the windshield 510 and the optical power Φ2 of the windshield correction lens 504 satisfy: (Φ1+Φ2)=0.05mrad. -1 .

[0084] For other descriptions of the display device 500 , including the projection module 501 , the waveguide coupling module 502 , the surface relief optical waveguide 503 and the windshield correction lens 504 , please refer to the corresponding parts in FIG. 2 above, which will not be repeated here.

[0085] Figure 6 is a schematic diagram of the structure of an optical imaging system 60 comprising a second display device 600 according to an embodiment of the present application. Specifically, the optical imaging system 60 includes a display device 600 and a windshield 610. The display device 600 comprises a projection module 601, a waveguide coupling module 602, a geometric reflector array optical waveguide 603, and a Fresnel lens 604. The waveguide coupling module 502 comprises a first lens 621, a second lens 622, a first reflector 623, and a second reflector 624, arranged in sequence along the transmission direction of the image light. The first lens 621 is a doublet.

[0086] Specifically, when the optical imaging system 60 is working, the projection module 601 emits image light to the waveguide coupling module 602. The image light is sequentially transmitted through the first lens 621 and the second lens 622. After being emitted from the second lens 622, it is successively reflected by the first reflector 623 and the second reflector 624, and is coupled into the geometric reflector array optical waveguide 603 from the coupling-in area of ​​the geometric reflector array optical waveguide 603. After being transmitted in the geometric reflector array optical waveguide 603, it is emitted from the out-coupling area of ​​the geometric reflector array optical waveguide 603 to the Fresnel lens 604, and then transmitted to the surface of the windshield 610, and is reflected by the windshield 610 into the human eye.

[0087] For example, Table 3 shows relevant optical data of the Fresnel lens 604 .

[0088] Table 3

[0089] For example, Table 4 shows relevant optical data of the waveguide coupling module 602 .

[0090] Table 4

[0091] Similarly, the absolute value of the radius of curvature R represents the magnitude of the curvature radius of the corresponding surface, and the positive and negative signs indicate the bending direction of the corresponding surface. The data in Tables 3 and 4 above are not exact values, but only approximate values. An infinite radius of curvature is an ideal design.

[0092] In the optical imaging system 60 shown in FIG6 , the chromatic aberration value Δθ of the Fresnel lens 604 is CF1 and the color difference Δθ of the waveguide coupling module 602 CF2 Satisfy: (Δθ CF1 +Δθ CF2 )=-0.6mrad. The focal power Φ1 of the windshield 610 and the focal power Φ2 of the Fresnel lens 604 satisfy: (Φ1+Φ2)=0.13mrad -1 .

[0093] For other descriptions of the display device 600 , including the projection module 601 , the waveguide coupling module 602 , the geometric reflector array optical waveguide 603 and the Fresnel lens 604 , please refer to the corresponding parts in FIG. 2 above, which will not be repeated here.

[0094] FIG7 is a schematic diagram of the structure of an optical imaging system 70 comprising a third display device 700 according to an embodiment of the present application. Specifically, the optical imaging system 70 includes a display device 700 and a windshield 710. The display device 700 includes a projection module 701, a waveguide coupling module 702, a surface relief optical waveguide 703, and a transmissive grating 704. The waveguide coupling module 702 includes a first lens 721, a second lens 722, and a reflective grating 723, arranged in sequence along the transmission direction of the image light. The first lens 721 is a doublet lens. The optical waveguide 703 is a surface relief optical waveguide, but the present application is not limited thereto.

[0095] Specifically, when the optical system imaging 70 is working, the projection module 701 emits image light to the waveguide coupling module 702. After the image light is transmitted through the first lens 721 and the second lens 722 in sequence, it is reflected by the reflective grating 723, coupled into the surface relief optical waveguide 703 from the coupling area of ​​the surface relief optical waveguide 703, transmitted in the surface relief optical waveguide 703, and emitted from the coupling area of ​​the surface relief optical waveguide 703 to the transmission grating 704, and then transmitted to the surface of the windshield 710, and reflected by the windshield 710 into the human eye.

[0096] For example, Table 5 shows relevant optical data of the transmission grating 704 .

[0097] Table 5

[0098] For example, Table 6 shows relevant optical data of the waveguide coupling module 702 .

[0099] Table 6

[0100] Similarly, the absolute value of the radius of curvature R represents the magnitude of the corresponding surface's curvature, and the sign indicates the direction of the corresponding surface's bending. The data in Tables 5 and 6 are approximate, not exact values. An infinite radius of curvature is an ideal design.

[0101] In the optical imaging system 70 shown in FIG7 , the chromatic aberration value Δθ of the transmissive grating 704 is CF1 and the color difference Δθ of the waveguide coupling module 702 CF2 Satisfy: (Δθ CF1 +Δθ CF2 )=1.8mrad. The optical focal length Φ1 of the windshield 710 and the optical focal length Φ2 of the transmission grating 704 satisfy: (Φ1+Φ2)=0.4mrad -1 .

[0102] For other descriptions of the display device 700 , including the projection module 701 , the waveguide coupling module 702 , the surface relief optical waveguide 703 and the windshield correction element transmission grating 704 , please refer to the corresponding parts in FIG. 2 above and will not be repeated here.

[0103] FIG8 is a schematic diagram of the structure of an optical imaging system 80 comprising a fourth display device 800 according to an embodiment of the present application. Specifically, the optical imaging system 80 includes a display device 800 and a windshield 810. The display device 800 includes a projection module 801, a waveguide coupling module 802, a volume holographic grating waveguide 803, and a windshield correction lens 804. The surface type of the windshield correction lens 804 is an extended polynomial. The waveguide coupling module 802 includes a first lens 821, a first reflector 822, and a transmission grating 823, arranged in sequence along the transmission direction of the image light.

[0104] Specifically, when the optical imaging system 80 is working, the projection module 801 emits image light to the waveguide coupling module 802. The image light first transmits the first lens 821 and is then reflected by the first reflector 822 to the transmission grating 823. After being emitted from the transmission grating 823, the image light is coupled into the volume holographic grating waveguide 803 from the coupling region of the volume holographic grating waveguide 803. After being transmitted in the volume holographic grating waveguide 803, the image light is emitted from the coupling region of the volume holographic grating waveguide 803 to the windshield correction lens 804, and then is transmitted to the surface of the windshield 810, and is reflected by the windshield 810 and enters the human eye.

[0105] For example, Table 7 shows relevant optical data of the windshield correction lens 804 .

[0106] Table 7

[0107] For example, Table 8 shows relevant optical data of the waveguide coupling module 802 .

[0108] Table 8

[0109] Similarly, the absolute value of the radius of curvature R represents the magnitude of the curvature radius of the corresponding surface, and the positive and negative signs indicate the direction of the corresponding surface's bending. The data in Tables 7 and 8 above are not exact values, but approximate values. An infinite radius of curvature is an ideal design.

[0110] In the optical imaging system 80 shown in FIG8 , the chromatic aberration value Δθ of the windshield correction lens 804 is CF1 and the color difference Δθ of the waveguide coupling module 802 CF2 Satisfy: (Δθ CF1 +Δθ CF2 )=-1.6mrad. The optical power Φ1 of the windshield 810 and the optical power Φ2 of the windshield correction lens 804 satisfy: (Φ1+Φ2)=-0.07mrad. -1 .

[0111] For other descriptions of the display device 800 , including the projection module 801 , the waveguide coupling module 802 , the optical waveguide 803 and the windshield correction element 804 , please refer to the corresponding parts in FIG. 2 , which will not be repeated here.

[0112] It should be noted that the above-mentioned Figures 5 to 8 are only some embodiments provided by the present application and do not limit the scope of protection of the present application. The embodiments of the above-mentioned Figures 5 to 8 can be implemented independently or partially combined with each other. For example, the waveguide coupling module 502 in the embodiment shown in Figure 5 can be used in the embodiment shown in Figure 6, etc.

[0113] FIG9 is a circuit diagram of a display device provided in an embodiment of the present application. As shown in FIG9 , the circuit in the display device mainly includes a host CPU 1201, an external memory interface 1202, an internal memory 1203, an audio module 1204, a video module 1205, a power module 1206, a wireless communication module 1207, an I / O interface 1208, a video interface 1209, a display circuit 1210, and a modulator 1212. Among them, the main processor 1201 and its peripheral components, such as the external memory interface 1202, the internal memory 1203, the audio module 1204, the video module 1205, the power module 1206, the wireless communication module 1207, the I / O interface 1208, the video interface 1209, and the display circuit 1210 can be connected via a bus. The main processor 1201 can be called a front-end processor.

[0114] In addition, the circuit diagrams shown in the embodiments of the present application do not constitute specific limitations on the display device. In other embodiments of the present application, the display device may include more or fewer components than shown, or may combine or separate certain components, or arrange the components differently. The components shown in the diagrams may be implemented in hardware, software, or a combination of software and hardware.

[0115] The main processor 1201 includes one or more processing units. For example, the main processor 1201 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processor (NPU). Different processing units may be independent devices or integrated into one or more processors.

[0116] The main processor 1201 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the main processor 1201 is a cache memory. This memory can store instructions or data that the main processor 1201 has just used or is reusing. If the main processor 1201 needs to use the instruction or data again, it can directly call it from the memory. This avoids repeated accesses, reduces the waiting time of the main processor 1201, and thus improves system efficiency.

[0117] In some embodiments, the display device may further include multiple input / output (I / O) interfaces 1208 connected to the main processor 1201. The interfaces 1208 may include an I2C (Inter-Integrated Circuit) interface, an I2S (Inter-Integrated Circuit Sound) interface, a PCM (Pulse Code Modulation) interface, a UART (Universal Asynchronous Receiver / Transmitter) interface, a MIPI (Mobile Industry Processor Interface) interface, a GPIO (General-Purpose Input / Output) interface, a SIM (Subscriber Identity Module) interface, and / or a USB (Universal Serial Bus) interface. The I / O interfaces 1208 may be connected to devices such as a mouse, touchpad, keyboard, camera, speaker, microphone, etc., as well as physical buttons on the display device (e.g., volume button, brightness adjustment button, power button, etc.).

[0118] The external memory interface 1202 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the display device. The external memory card communicates with the main processor 1201 through the external memory interface 1202 to implement data storage function.

[0119] The internal memory 1203 can be used to store computer executable program codes, which include instructions. The internal memory 1203 may include a program storage area and a data storage area. The program storage area may store an operating system, an application required for at least one function (such as a call function, a time setting function, etc.), etc. The data storage area may store data created during the use of the display device (such as a phone book, world time, etc.), etc. In addition, the internal memory 1203 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash memory (UFS), etc. The main processor 1201 executes various functional applications and data processing of the display device by running instructions stored in the internal memory 1203 and / or instructions stored in a memory provided in the main processor 1201.

[0120] The display device can implement audio functions such as music playback and calls through the audio module 1204 and the application processor.

[0121] The audio module 1204 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals. The audio module 1204 can also be used to encode and decode audio signals, such as for playing or recording. In some embodiments, the audio module 1204 can be provided in the main processor 1201, or some functional modules of the audio module 1204 can be provided in the main processor 1201.

[0122] The video interface 1209 can receive external audio and video signals, which can specifically be a High Definition Multimedia Interface (HDMI), a Digital Visual Interface (DVI), a Video Graphics Array (VGA), a Display Port (DP), etc. The video interface 1209 can also output video to the outside. When the display device is used as a head-up display, the video interface 1209 can receive speed signals and power signals input from peripheral devices, and can also receive external AR video signals. When the display device is used as a projector, the video interface 1209 can receive video signals input from an external computer or terminal device.

[0123] The video module 1205 can decode the video input from the video interface 1209, for example, by performing H.264 decoding. The video module can also encode the video captured by the display device, for example, by performing H.264 encoding on the video captured by an external camera. Furthermore, the main processor 1201 can also decode the video input from the video interface 1209 and output the decoded image signal to the display circuit 1210.

[0124] The display circuit 1210 and modulator 1212 are used to display corresponding images. In this embodiment, the video interface 1209 receives an external video source signal, which the video module 1205 decodes and / or digitizes before outputting one or more image signals to the display circuit 1210. The display circuit 1210 drives the modulator 1212 based on the input image signal to image the incident polarized light and output image light. Furthermore, the main processor 1201 may also output one or more image signals to the display circuit 1210.

[0125] In this embodiment, the display circuit 1210 and the modulator 1212 are electronic components in the modulation unit 712 shown in FIG. 8 , and the display circuit 1210 can be referred to as a driving circuit.

[0126] The power module 1206 is used to provide power to the main processor 1201 and the light source 1200 based on input power (e.g., direct current). The power module 1206 may include a rechargeable battery, which can provide power to the main processor 1201 and the light source 1200. Light emitted by the light source 1200 can be transmitted to the modulator 1212 for imaging, thereby forming an image light signal.

[0127] The wireless communication module 1207 enables the display device to communicate wirelessly with the outside world. It can provide wireless local area networks (WLAN) (such as Wireless Fidelity (Wi-Fi) networks), Bluetooth (BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), infrared technology (IR) and other wireless communication solutions. The wireless communication module 1207 can be one or more devices that integrate at least one communication processing module. The wireless communication module 1207 receives electromagnetic waves via an antenna, frequency modulates and filters the electromagnetic wave signals, and sends the processed signals to the main processor 1201. The wireless communication module 1207 can also receive signals to be sent from the main processor 1201, frequency modulate them, amplify them, and convert them into electromagnetic waves for radiation through the antenna.

[0128] In addition, in addition to being input through the video interface 1209, the video data decoded by the video module 1205 can also be received wirelessly through the wireless communication module 1207 or read from an external memory. For example, the display device can receive video data from a terminal device or an in-vehicle entertainment system through the wireless local area network in the vehicle, and the display device can also read audio and video data stored in an external memory.

[0129] The above-mentioned display device can be installed on a vehicle. Please refer to Figure 10, which is a schematic diagram of a possible functional framework of a vehicle provided in an embodiment of the present application.

[0130] As shown in FIG10 , the functional framework of a vehicle may include various subsystems, such as a sensor system 12, a control system 14, one or more peripheral devices 16 (one of which is shown as an example), a power supply 18, a computer system 20, and a head-up display system 22. Optionally, the vehicle may also include other functional systems, such as an engine system that provides power to the vehicle, etc., which are not limited in this application.

[0131] The sensor system 12 may include a plurality of detection devices that sense the information being measured and convert the sensed information into electrical signals or other required information outputs according to certain rules. As shown in the figure, these detection devices may include a global positioning system (GPS), a vehicle speed sensor, an inertial measurement unit (IMU), a radar unit, a laser rangefinder, a camera, a wheel speed sensor, a steering sensor, a gear position sensor, or other components for automatic detection, etc., and this application does not limit them.

[0132] The control system 14 may include several components, such as a steering unit, a braking unit, a lighting system, an autonomous driving system, a map navigation system, a network timing system, and an obstacle avoidance system, as shown. Optionally, the control system 14 may also include components such as a throttle controller and an engine controller for controlling vehicle speed, although this application does not limit this.

[0133] The peripheral devices 16 may include several components, such as the communication system shown in the figure, a touch screen, a user interface, a microphone, and a speaker. The communication system is used to enable network communication between the vehicle and other devices. In practical applications, the communication system may utilize wireless communication technology or wired communication technology to enable network communication between the vehicle and other devices. Wired communication technology may involve communication between the vehicle and other devices via network cables or optical fibers.

[0134] Power supply 18 represents a system that provides electrical power or energy to the vehicle, and may include, but is not limited to, rechargeable lithium batteries or lead-acid batteries. In practical applications, one or more battery components in the power supply are used to provide electrical energy or energy for starting the vehicle. The type and material of the power supply are not limited in this application.

[0135] Several functions of the vehicle are controlled and implemented by the computer system 20. The computer system 20 may include one or more processors 2001 (the figure shows one processor as an example) and a memory 2002 (also referred to as a storage device). In actual applications, the memory 2002 is also inside the computer system 20, or it may be outside the computer system 20, for example, as a cache in the vehicle, etc., which is not limited in this application. Among them, the processor 2001 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2001 can be used to run the relevant programs stored in the memory 2002 or the instructions corresponding to the programs to realize the corresponding functions of the vehicle.

[0136] The memory 2002 may include a volatile memory, such as RAM; the memory may also include a non-volatile memory, such as ROM, flash memory, HDD or solid-state drive SSD; the memory 2002 may also include a combination of the above types of memory. The memory 2002 can be used to store a set of program codes or instructions corresponding to the program codes, so that the processor 2001 can call the program codes or instructions stored in the memory 2002 to implement the corresponding functions of the vehicle. In the present application, the memory 2002 can store a set of program codes for vehicle control, and the processor 2001 can call the program codes to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is described in detail below in this application.

[0137] Optionally, in addition to storing program code or instructions, memory 2002 may also store information such as road maps, driving routes, and sensor data. Computer system 20 may integrate with other components in the vehicle functional framework diagram, such as sensors and GPS in the sensor system, to implement relevant vehicle functions. For example, computer system 20 may control the vehicle's direction or speed based on data input from sensor system 12, although this application does not limit this.

[0138] The head-up display system 22 may include several components, such as the windshield shown, a controller, and a head-up display. The controller 222 is configured to generate images (e.g., images containing vehicle status such as speed, battery / fuel level, and augmented reality (AR) content) in response to user instructions and transmit these images to the head-up display for display. The head-up display may include an image generation unit and a reflector assembly. The windshield is configured to cooperate with the head-up display to implement the optical path of the head-up display system, thereby presenting the target image in front of the driver. The functions of some components of the head-up display system may also be implemented by other subsystems of the vehicle. For example, the controller may also be a component of the control system.

[0139] FIG10 of this application illustrates four subsystems: sensor system 12, control system 14, computer system 20, and head-up display system 22. These subsystems are merely illustrative and not limiting. In practice, a vehicle may combine several components according to different functions to create subsystems with corresponding functions. In practice, a vehicle may include more or fewer systems or components, and this application does not limit this.

[0140] The above-mentioned transportation vehicles can be cars, trucks, buses, ships, airplanes, helicopters, recreational vehicles, amusement park vehicles, construction equipment, trams, golf carts, trains, etc., and the embodiments of the present application do not make special limitations.

[0141] Figure 11 is a schematic functional block diagram of a mobile carrier 1100 provided in an embodiment of the present application. The mobile carrier 1100 may include a perception system 120, a display device 130, and a computing platform 150. The perception system 120 may include one or more sensors for sensing information about the environment surrounding the mobile carrier 1100. For example, the perception system 120 may include a positioning system, which may be a global positioning system (GPS), a Beidou system or other positioning system, an inertial measurement unit (IMU), a laser radar, a millimeter-wave radar, an ultrasonic radar, and a camera.

[0142] Some or all functions of the mobile carrier 1100 can be controlled by the computing platform 150. The computing platform 150 may include one or more processors, such as processors 151 to 15n (n is a positive integer). A processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of a hardware circuit. The logical relationship of the hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as a field programmable gate array (FPGA). In a reconfigurable hardware circuit, the process of the processor loading a configuration file to implement the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc. In addition, the computing platform 150 can also include a memory for storing instructions. Some or all of the processors 151 to 15n can call the instructions in the memory and execute the instructions to achieve the corresponding functions. Among them, the display device 130 in the cockpit is a display device suitable for the embodiments of the present application, such as the display device 500, display device 600, display device 700 and display device 800 in the above embodiments.

[0143] The mobile carrier in this application may include a road vehicle, a water vehicle, an air vehicle, or an entertainment device. For example, the mobile carrier may be a vehicle, which is a vehicle in a broad sense and may be a transportation vehicle (such as a commercial vehicle, a passenger car, a train, etc.), an amusement device, a toy vehicle, etc. The embodiments of this application do not specifically limit the type of vehicle. For another example, the mobile carrier may be a vehicle such as an airplane or a ship.

[0144] Unless otherwise defined, technical or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0145] The above description is only one embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the present application shall be included in the scope of protection of the present application.

Claims

1. A display device, characterized in that: include: Projection module, waveguide coupling module, optical waveguide and windshield correction element, The projection module is used to project image light to the waveguide coupling module; The waveguide coupling module is used to couple the image light from the projection module into the optical waveguide and compensate for the chromatic aberration value of the windshield correction element; The optical waveguide is used to emit the image light from the waveguide coupling module to the windshield correction element; The windshield correction element is used to adjust the transmission angle and / or transmission direction of the image light from the optical waveguide, and emit the adjusted image light to the windshield.

2. The display device according to claim 1, characterized in that The chromatic aberration value Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 satisfy: -3mrad≤(Δθ CF1 +Δθ CF2 )≤3mrad Among them, Δθ CF1 represents the angle deviation between the C light and the F light corresponding to the windshield correction element at the maximum viewing angle θ, Δθ CF2 It represents the angle deviation between the C light and the F light corresponding to the waveguide coupling module at the maximum field angle θ, the wavelength of the C light is 656nm, the wavelength of the F light is 486nm, mrad is the unit of measurement, Δθ CF1 and Δθ CF2 The signs of are opposite.

3. The display device according to claim 2, characterized in that: The focal power Φ1 of the windshield and the focal power Φ2 of the windshield correction element satisfy: -0.5m -1 ≤(Φ1+Φ2)≤0.5m -1 .

4. The display device according to claim 2 or 3, characterized in that: The chromatic aberration value Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfies: (Δθ CF1 +Δθ CF2 )=0.3mrad.

5. The display device according to claim 3 or 4, characterized in that: The focal power Φ1 of the windshield and the focal power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=0.05m -1 .

6. The display device according to claim 5, characterized in that: The windshield correction element is a lens whose surface type is an extended polynomial, and the waveguide coupling module includes a plurality of lenses.

7. The display device according to claim 6, characterized in that: The waveguide coupling module comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along the transmission direction of the image light, and the second lens is a doublet lens.

8. The display device according to claim 2 or 3, characterized in that: The chromatic aberration value Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfies: (Δθ CF1 +Δθ CF2 )=-0.6mrad.

9. The display device according to claim 3 or 8, characterized in that: The focal power Φ1 of the windshield and the focal power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=0.13m -1 .

10. The display device according to claim 9, characterized in that: The windshield correction element is a Fresnel lens, and the waveguide coupling module includes a plurality of lenses and at least one reflector.

11. The display device according to claim 10, characterized in that: The waveguide coupling module comprises a first lens, a second lens, a first reflector and a second reflector which are sequentially arranged along the transmission direction of the image light, wherein the first lens is a doublet lens.

12. The display device according to claim 2 or 3, characterized in that: The chromatic aberration value Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfies: (Δθ CF1 +Δθ CF2 )=1.8mrad.

13. The display device according to claim 3 or 12, characterized in that: The focal power Φ1 of the windshield and the focal power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=0.4m -1 .

14. The display device according to claim 13, characterized in that: The windshield correction element is a transmission grating, and the waveguide coupling module includes a plurality of lenses and a reflection grating.

15. The display device according to claim 14, characterized in that: The waveguide coupling module comprises a first lens, a second lens and a reflective grating which are sequentially arranged along the transmission direction of the image light, and the first lens is a double-cemented lens.

16. The display device according to claim 2 or 3, characterized in that: The chromatic aberration value Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 Satisfies: (Δθ CF1 +Δθ CF2 )=-1.6mrad.

17. The display device according to claim 3 or 16, characterized in that: The focal power Φ1 of the windshield and the focal power Φ2 of the windshield correction element satisfy: (Φ1+Φ2)=-0.07m -1 .

18. The display device according to claim 17, characterized in that: The windshield correction element is a lens whose surface type is an extended polynomial, and the waveguide coupling module includes at least one lens, at least one reflector and a transmission grating.

19. The display device according to claim 18, characterized in that The waveguide coupling module comprises a first lens, a first reflector and a transmission grating which are sequentially arranged along a transmission direction of the image light.

20. The display device according to any one of claims 1 to 19, characterized in that: The windshield correction element is also used as a dust cover for the display device.

21. The display device according to any one of claims 1 to 19, characterized in that: The display device further comprises a dust cover, and the windshield correction element is fixed to the dust cover as a whole.

22. A cockpit system, characterized in that: The invention comprises a display device and an instrument panel as claimed in any one of claims 1 to 21, wherein the display device is installed in the instrument panel.

23. A means of transport, characterized in that: The invention comprises the windshield and the display device as described in any one of 1 to 21 or the cockpit system as described in claim 22.

Images