Display device and vehicle

Abstract

The invention 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 coupling module, an optical waveguide and a windshield correction element. Wherein the projection module is used for projecting image light to the waveguide coupling module; the waveguide coupling module is used for coupling the image light from the projection module into the optical waveguide and compensating the color difference value of the windshield correction element. The optical waveguide is used for emitting the image light from the waveguide coupling-in module to the windshield correction element. The windshield correction element is used for adjusting the transmission angle and / or the transmission direction of the image light from the optical waveguide and emitting the adjusted image light to the windshield glass. The display device provided by the invention can compensate the chromatic aberration of the windshield correction element to achieve the purpose of improving the imaging quality.

Description

Technical Field

[0001] The present application relates to the field of display technology and the field of intelligent vehicle driving technology, and more specifically, to a display device and a vehicle. Background Art

[0002] Automobiles have become an indispensable means of transportation in people's daily lives. With the increasing number of automobiles, the frequency of traffic accidents is also getting higher and higher. In order to improve driving safety, head up displays (HUDs), especially augmented reality head up displays (AR-HUDs), have become a popular research direction.

[0003] In order to reduce the volume of the HUD, a new type of HUD using a waveguide as the transmission image light has become the research focus. In the waveguide HUD solution, it is usually necessary to arrange a correction element in the light output direction of the waveguide to correct problems such as image distortion caused by the windshield. However, it should be noted that when the correction element is a single component, it will additionally introduce chromatic aberration to the HUD system, also causing image quality degradation. If such a correction element is a multi-component combination, it will lead to an increase in the volume and cost of the HUD system.

[0004] Therefore, how to use a single element to correct the deterioration of image quality caused by the windshield glass and at the same time eliminate the chromatic aberration introduced by the single correction element is a problem that needs to be solved. Summary of the Invention

[0005] The present application provides a display device and a vehicle. The display device provided by the present application has a small volume and good imaging quality.

[0006] In a first aspect, an embodiment of the present application provides a display device. The display device includes: a projection module, a waveguide coupling module, an optical waveguide, and a windshield correction element. Wherein, the projection module is configured to project image light to the waveguide coupling module; the waveguide coupling module is configured to couple the image light from the projection module into the optical waveguide, and is further configured to compensate for the chromatic aberration value of the windshield correction element; the optical waveguide is configured to output the image light from the waveguide coupling module to the windshield correction element; the windshield correction element is configured to adjust the transmission angle and / or transmission direction of the image light from the optical waveguide, and output the adjusted image light to the windshield glass.

[0007] Based on the above solution, the display device provided by the present application can compensate for the chromatic aberration of the windshield correction element, thereby achieving the purpose of improving the imaging quality, and further enhancing the user experience. In addition, in the solution of the present application, the windshield correction element is a single element rather than a combined system, and can also reduce the volume of the display device.

[0008] In combination with the first aspect, in some implementations of the first aspect, the color difference Δθ of the windshield correction element CF1 and the color difference Δθ of the waveguide coupling module CF2 satisfy: -3 mrad ≤ (Δθ CF1 + Δθ CF2 ) ≤ 3 mrad, where Δθ CF1 represents the angular deviation between the C light and the F light corresponding to the windshield correction element at the maximum field of view angle θ, and Δθ CF2 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 656 nm, the wavelength of the F light is 486 nm, and mrad is the measurement unit of milliradian. The signs of Δθ CF1 and Δθ CF2 are opposite.

[0009] Based on the above color difference range, the system color difference of the display device provided in this application is small, and the imaging quality is good.

[0010] In combination with the first aspect, in some implementations of the first aspect, the optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: -0.5 m- 1 ≤ (Φ 1 + Φ 2 ) ≤ 0.5 m- 1 .

[0011] Based on the display device provided in this application, the optical power of the windshield correction element can compensate for the optical power of the windshield, so that the small optical power range of the system is within a small range, thereby achieving the purpose of improving the imaging quality.

[0012] In combination with the first aspect, in some implementations of the first aspect, the color difference Δθ of the windshield correction element CF1 and the color difference Δθ of the waveguide coupling module CF2 satisfy: (Δθ CF1 + Δθ CF2 ) = 0.3 mrad.

[0013] In combination with the first aspect, in some implementations of the first aspect, the optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = 0.05 m- 1 .

[0014] In combination with the first aspect, in certain implementations of the first aspect, the windshield correction element is a lens with an extended polynomial surface type, and the waveguide coupling module includes a plurality of lenses.

[0015] 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.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the chromatic aberration Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 satisfy: (Δθ CF1 + Δθ CF2 ) = -0.6 mrad.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = 0.13 m^-1 1 .

[0018] 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 a plurality of lenses and at least one mirror.

[0019] 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 first mirror, and a second mirror arranged in sequence along the transmission direction of the image light, and the first lens is a doublet lens.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the chromatic aberration Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 satisfy: (Δθ CF1 + Δθ CF2 ) = 1.8 mrad.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = 0.4 m^-1 1 .

[0022] In combination with the first aspect, in some 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.

[0023] In combination with the first aspect, in some implementations of the first aspect, the waveguide coupling module includes a first lens, a second lens, and a reflective grating arranged in sequence along the transmission direction of the image light, and the first lens is a doublet lens.

[0024] In combination with the first aspect, in some implementations of the first aspect, the chromatic aberration Δθ of the windshield correction element CF1 and the chromatic aberration Δθ of the waveguide coupling module CF2 satisfy: (Δθ CF1 + Δθ CF2 ) = -1.6 mrad.

[0025] In combination with the first aspect, in some implementations of the first aspect, the optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = -0.07 m^-1 1 .

[0026] In combination with the first aspect, in some implementations of the first aspect, the windshield correction element is a lens with an extended polynomial surface type, and the waveguide coupling module includes at least one lens, at least one mirror, and a transmissive grating.

[0027] In combination with the first aspect, in some implementations of the first aspect, the waveguide coupling module includes a first lens, a first mirror, and a transmissive grating arranged in sequence along the transmission direction of the image light.

[0028] In combination with the first aspect, in some implementations of the first aspect, the windshield correction element is further configured to serve as a dust cover of the display device.

[0029] In combination with the first aspect, in some implementations of the first aspect, the display device further includes a dust cover, and the windshield correction element is fixed integrally with the dust cover.

[0030] In a second aspect, an embodiment of the present application provides a vehicle-mounted system. The vehicle-mounted system includes the display device and the instrument panel in the first aspect and any possible implementation of the first aspect, and the display device is installed in the instrument panel.

[0031] In a third aspect, an embodiment of the present application provides a vehicle. The vehicle includes the display device and the windshield in the first aspect and any possible implementation manner in the first aspect, or the vehicle includes the cockpit system in the second aspect. Description of the Drawings

[0032] Figure 1 FIG. is a schematic diagram of an application scenario of the HUD device provided by an embodiment of the present application.

[0033] Figure 2 FIG. is a schematic structural diagram of a display device 200 provided by an embodiment of the present application.

[0034] Figure 3 FIG. shows a possible structure of the projection module 201 provided by an embodiment of the present application.

[0035] Figure 4 FIG. shows a possible structure of the projection module 201 in which the modulation module 312 is a DMD provided by an embodiment of the present application.

[0036] Figure 5 FIG. is a schematic structural diagram of an optical imaging system 50 constituted by a first display device 500 provided by an embodiment of the present application.

[0037] Figure 6 FIG. is a schematic structural diagram of an optical imaging system 60 constituted by a second display device 600 provided by an embodiment of the present application.

[0038] Figure 7 FIG. is a schematic structural diagram of an optical imaging system 70 constituted by a third display device 700 provided by an embodiment of the present application.

[0039] Figure 8 FIG. is a schematic structural diagram of an optical imaging system 80 constituted by a fourth display device 800 provided by an embodiment of the present application.

[0040] Figure 9 FIG. is a schematic circuit diagram of the display device provided by an embodiment of the present application.

[0041] Figure 10 FIG. shows a possible functional framework schematic diagram of a vehicle provided by an embodiment of the present application.

[0042] Figure 11 FIG. shows a schematic functional block diagram of a mobile carrier 1100 provided by an embodiment of the present application. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present application will be described with reference to the drawings.

[0044] The following explanations are made to facilitate the understanding of the embodiments of the present application.

[0045] First, for the textual descriptions in the embodiments of the present application shown below or the terms in the drawings, terms such as "first", "second", etc. and various numerical numbers are only for convenience of description and are not necessarily used to describe a specific order or sequence, and do not limit the scope of the embodiments of the present application. For example, to distinguish different lenses, etc.

[0046] Second, the terms "comprising" and "having" and any variations thereof in the embodiments of the present application shown below are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0047] Third, in the embodiments of the present application, words such as "exemplarily" or "for example" are used to represent examples, illustrations, or explanations. Embodiments or design solutions described as "exemplarily" or "for example" should not be construed as being more preferred or having more advantages than other embodiments or design solutions. The use of words such as "exemplarily" or "for example" is intended to present relevant concepts in a specific manner for easy understanding.

[0048] Fourth, in the embodiments of the present application, image light refers to light carrying an image (or image information) and is used to generate an image.

[0049] Fifth, in the drawings of the present application, for ease of illustration, the thickness, size, and shape of each optical element have been slightly exaggerated. Specifically, the shapes of the optical elements shown in the drawings are shown by way of examples. For example, the shape of the curved mirror in the present application is not limited to the spherical or aspherical shapes shown in the drawings. And the drawings are only examples and are not drawn strictly to scale.

[0050] Sixth, unless otherwise defined, all terms used in the present application (including technical terms and scientific terms) have the same meaning as commonly understood by those of ordinary skill in the art to which the present application pertains. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless clearly defined herein.

[0051] Seventh, the present application relates to optical waveguides. Optical waveguides can generally be divided into two types: geometric waveguides (Geometric Waveguide) and diffractive waveguides (Diffractive Waveguide). Among them, geometric waveguides mainly include array optical waveguides and zigzag optical waveguides. Diffractive waveguides mainly include surface relief grating waveguides (Surface Relief Grating) manufactured using lithography technology and volumetric holographic grating waveguides (Volumetric Holographic Grating) manufactured based on holographic interference technology.

[0052] Eighth, in the present application, some numerical values such as the thickness and radius of optical elements are given in a table. It should be understood that different precision values of these numerical values should also be within the protection scope of the present application. For example, when the optical element is a lens and the surface radius given in the table for this lens is 29.98 m, the embodiments of the present application also protect the surface radius of this lens being 29.9810 mm, or 30 mm. In addition, numerical values near 29.98 m or approximate values of 29.98 m are also within the protection scope of the present application. Here, approximation refers to methods such as rounding or rounding up or down.

[0053] Ninth, the present application relates to focal power. In an optical system, focal power is used to measure the ability of the optical system to converge or diverge light rays. Among them, an optical system with positive focal power converges light rays. Conversely, an optical system with negative focal power diverges light rays.

[0054] Figure 1 It is a schematic diagram of an application scenario of the HUD device provided by the embodiment of the present application. As Figure 1 shown, the HUD device is installed on a vehicle. The HUD device is used to project the vehicle's status information, indication information of external objects, navigation information, etc. onto the driver's field of vision through the vehicle's windshield (which can also be called the windscreen). The status information includes but is not limited to information such as driving speed, driving mileage, fuel level, water temperature, and headlight status. The indication information of external objects includes but is not limited to safe vehicle distance, surrounding obstacles, and reverse image, etc. The navigation information includes but is not limited to direction arrows, distance, and driving time, etc.

[0055] 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, enabling the driver to obtain an augmented reality visual effect. For example, it can be used for augmented reality (AR) navigation, adaptive cruise control, 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 used in conjunction with the advanced driving assistant system (ADAS) of the vehicle. 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.

[0056] Currently, the research focus of HUD devices is mainly concentrated on how to reduce the device volume. Among them, an effective solution to reduce the volume of HUD devices is to use an optical waveguide as the medium for image light transmission. In this solution, after the image light enters the optical waveguide from the coupling region of the optical waveguide, it is totally reflected and exits parallel from the coupling-out region of the optical waveguide, and then enters the human eye through the windshield, enabling the human eye to see the virtual image. In this solution, the optical waveguide is only responsible for transmitting the image light and generally does not perform any "work" on the image itself (such as magnification or reduction), that is, it can be understood as "parallel light in, parallel light out". However, due to different curvatures at different positions of the windshield, the direction and / or angle of the image light reflected into the human eye are changed and are no longer parallel, resulting in poor image quality seen by the human eye. Therefore, in the optical waveguide HUD system, a correction element also needs to be arranged above the coupling-out region of the optical waveguide to correct the image quality degradation caused by the windshield. However, a single correction element will bring additional system chromatic aberration to the HUD system, and a combined correction element will cause the volume of the HUD device to increase.

[0057] 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.

[0058] Figure 2 It is a schematic structural diagram of a display device 200 provided by an embodiment of the present application. As Figure 2As shown, the display device 200 includes a projection module 201, a waveguide coupling module 202, an optical waveguide 203, and a windshield correction element 204. Among them, the projection module 201 is used to project image light onto the waveguide coupling module 202. The waveguide coupling module 202 is used to couple the image light from the projection module 201 into the optical waveguide 203, and is also used to compensate for the chromatic aberration of the windshield correction element 204. The optical waveguide 203 is used to emit the image light from the waveguide coupling module 202 to the windshield correction element 204. The windshield correction element 204 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 glass.

[0059] It can be 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 glass with a curvature change, resulting in deterioration of the image viewed by the human eye, such as distortion. Therefore, in order to eliminate the deterioration of the image quality caused by the windshield glass, a windshield correction element 204 is provided in front of the windshield glass. By adjusting the propagation angle and / or propagation direction of the image light, the image light is deflected. When the deflected image light is deflected by the windshield glass again, the emitted light is approximately parallel light, thus avoiding the influence of the windshield glass on the image quality. It should be noted that the deflection effects of the windshield correction element 204 and the windshield glass on the image light can be measured by different parameters. For example, parameters such as the focal length, refractive index of the windshield correction element 204 or the windshield glass itself, the distance between the windshield correction element 204 and the windshield glass, the optical power of the windshield correction element 204 and the windshield glass respectively, and the optical power of the combined system composed of the windshield correction element 204 and the windshield glass. In the solution of this application, the optical power is taken as an example of the parameter for measuring the correction effect. Specifically, in the solution of this application, by designing the optical power of the combined system of the windshield correction element 204 and the windshield glass to be approximately 0, the correction effect of the windshield correction element 204 on the windshield glass is reflected. Optionally, the optical power Φ 1 of the windshield glass and the optical power Φ 2 of the windshield correction element satisfy:

[0060] -0.5m -1 ≤(Φ 1 +Φ 2 )≤0.5m -1 .

[0061] It should be noted that there are light rays with different wavelengths in the image light of the incident windshield correction element 204. When light rays of multiple wavelengths pass through the windshield correction element 204, due to the different deflections of light rays with different wavelengths by the windshield correction element 204, the light rays with different wavelengths cannot be focused on the same plane. In severe cases, the generated display image will have color fringes, affecting the user's viewing experience. Therefore, in this application, the waveguide coupling module 202 compensates for the dispersion phenomenon existing in the windshield correction element 204. Specifically, in the solution of this application, by designing the chromatic aberration of the waveguide coupling module 202, the chromatic aberration value of the waveguide coupling module 202 is made close to but in the opposite direction to the chromatic aberration value of the windshield correction element 204, that is, the chromatic aberration of the combined system formed by the waveguide coupling module 202 and the windshield correction element 204 is close to zero, thereby achieving the effect of chromatic aberration compensation. Optionally, when using C light and F light to characterize the chromatic aberration value, in the display device 200 provided in this application, the chromatic aberration value Δθ CF1 of the windshield correction element 204 and the chromatic aberration value Δθ CF2 of the waveguide coupling module 202 satisfy the following relationship:

[0062] -3mrad ≤ (Δθ CF1 + Δθ CF2 ) ≤ 3mrad.

[0063] Wherein, Δθ CF1 represents the angular deviation between C light and F light corresponding to the windshield correction element 204 at the maximum field of view angle θ, and Δθ CF2 represents the angular deviation between C light and F light corresponding to the waveguide coupling module 202 at the maximum field of view angle θ. The wavelength of C light is 656nm, the wavelength of F light is 486nm, mrad is the measurement unit of milliradian, and the signs of Δθ CF1 and Δθ CF2 are opposite.

[0064] Generally speaking, the chromatic aberration of the windshield correction element 204 has a certain range. Therefore, in the solution of this 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. Thus, when the display device of this application is applied to different vehicle models, it is not necessary to carry out customized development for each vehicle model, achieving the purpose of reducing the development cost.

[0065] It should be noted that this application does not limit the type and quantity of the optical elements in the waveguide coupling module 202. Exemplarily, the waveguide coupling module 202 can be composed of multiple lenses, or composed of at least one lens and at least one mirror, or composed of at least one lens and a grating, or composed of at least one lens, at least one mirror and a grating, etc.

[0066] In addition, in order not to increase the volume of the display device 200, in the solution of the present application, the windshield correction element 204 is a single non-composite element. For example, the windshield correction element 204 can be a transmissive diffraction grating, a free-form mirror, a Fresnel lens, etc., which are not limited in the present application.

[0067] It should also be noted that the present application does not limit the type of the optical waveguide 203. It can be a geometric optical waveguide, such as a zigzag optical waveguide and an array optical waveguide, etc., or a diffractive optical waveguide, such as a surface relief optical waveguide and a volume holographic optical waveguide (which can also be called a volume holographic optical waveguide), etc. It can be understood that the above examples are only the currently common optical waveguides, and other new types of optical waveguides generated by future technological developments can also be applicable to the solution of the present application. Optionally, the material of the optical waveguide 203 is inorganic optical glass, such as borosilicate glass BK7, etc. Or, the material of the optical waveguide 203 is a thermoplastic, such as polypropylene (PP) material, polymethyl methacrylate (PMMA) material, polycarbonate (PC) material, etc., which are not limited in the present application.

[0068] In the embodiment of the present application, the projection module 201 can adopt a liquid crystal on silicon (LCoS) display, an organic light-emitting diode (OLED) display, a liquid crystal display (LCD), a digital light procession (DLP) display, a micro-electro-mechanical systems (MEMS) display, an organic light-emitting diode (OLED) display, a micro-LED display, a display using the display technology of miniLED, etc., which are not limited in the present application.

[0069] As an example, Figure 3A possible structure of the projection module 201 provided by the embodiments of the present application is shown. Among them, the projection module 201 includes a light source 311, a modulation module 312, and a projection device 313. According to different display technologies adopted by the projection module 201, the modulation module 312 can be an LCoS modulator, or a DMD, or a transmissive spatial light modulator LCD, etc. Exemplarily, when the modulation module 312 is an LCoS modulator, the light source 311 can be a red, green, and blue three-color light-emitting diode (LED) light source, which together with the LCoS modulator constitutes an LCoS display. When the modulation module 312 is a DMD, it can be a DMD modulator controlled by MEMS, and is paired with a laser light source or an LED light source to form a DLP display. Or, when the modulation module 312 is an LCD modulator, the light source 311 can adopt a linear light source of red, green, and blue three-color cold cathode fluorescent tubes, and together with the LCD modulator constitutes an LCD display. Among them, the projection device 313 can be a projection lens.

[0070] Optionally, in order to improve the projection quality and / or reduce the volume of the projection module 201, in some embodiments, the projection module 201 further includes a refractive module 314, or the projection module 201 further includes a polarization conversion module 314. When the projection module 201 includes the refractive module 314, the refractive 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 viewing angle of the projection), and / or one or more prisms (for folding the optical path to reduce the volume of the projection module), etc., which are not limited in the present application. 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.

[0071] As an example, Figure 4 A possible structure of the projection module 201 with the modulation module 312 being a DMD provided by the embodiments of the present application is shown. As Figure 4 shown, 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 lights of the three primary colors, including red light, blue light, and green light. In order to improve the light energy utilization rate, in some embodiments, collimating lenses can be arranged behind the monochromatic light arrays, respectively as Figure 4The collimating lenses 4111, 4112, and 4113 therein. Specifically, when the projection module 201 operates, 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 exiting from the lens group 430, they are incident on the DMD through a prism. The DMD modulates the input light beam based on the data information of the input image and outputs image light. The image light passes through the prism and is incident on the projection device 313, and then the projection device 313 emits the image light to the waveguide coupling module 202.

[0072] It can be understood that when the display device 200 is used as an HUD display device, the display device 200 further has a housing for protecting the above-mentioned 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. In addition, the display device 200 further includes a dust cover. In one realizable case, the windshield correction element 204 is also used as the dust cover of the display device 200. At this time, the size of the windshield correction element 204 is equivalent to the size of the dust cover reserved on the housing. In another realizable way, the windshield correction element 204 can be fixed integrally with the dust cover. For example, the windshield correction element 204 is pasted to the dust cover through a transparent optical adhesive.

[0073] It can also be understood that the display device provided in the embodiments of the present application can be installed in the instrument panel (IP) of a vehicle.

[0074] Based on the above Figure 2 description, the following will respectively describe the specific embodiments of the optical imaging system 50 constituted by the first display device 500, the optical imaging system 60 constituted by the second display device 600, the optical imaging system 70 constituted by the third display device 700, and the optical imaging system 80 constituted by the fourth display device 800 provided in the embodiments of the present application in conjunction with Figures 5 to 8 ...

[0075] Figure 5Schematic diagram of the optical imaging system 50 constituted by the first display device 500 provided in the embodiments 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. Among them, 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. Among them, the second lens 522 is a doublet lens.

[0076] Specifically, when the optical system 50 operates, the projection module 501 emits image light to the waveguide coupling module 502. After the image light sequentially passes through the first lens 521, the second lens 522, the third lens 523, the fourth lens 524, and the fifth lens 525, it is coupled into the surface relief optical waveguide 503 from the coupling region of the surface relief optical waveguide 503. After being transmitted in the surface relief optical waveguide 503, it exits from the coupling-out region of the surface relief optical waveguide 503 into the windshield correction lens 504, and then is transmitted to the surface of the windshield 510 and is reflected by the windshield 510 into the human eye.

[0077] Exemplarily, Table 1 shows the relevant optical data of the windshield correction lens 504.

[0078] Table 1

[0079]

[0080] Exemplarily, Table 2 shows the relevant optical data of the waveguide coupling module 502.

[0081] Table 2

[0082]

[0083] It should be noted that in the embodiments of the present application, the absolute value of the radius of curvature R represents the size of the radius of curvature of the corresponding surface, and the positive and negative signs represent the bending direction of the corresponding surface. When the center of the sphere corresponding to the radius of curvature is located on the left side of the vertex of the spherical surface, the sign of the radius of curvature of the spherical surface is negative, and when the center of the sphere corresponding to the radius of curvature is located on the right side of the vertex of the spherical surface, the sign of the radius of curvature of the spherical surface is positive.

[0084] It should also be noted that the data in Table 1 and Table 2 above are not accurate values, but only approximate values.

[0085] It can be understood that the radius of curvature in Table 1 and Table 2 above is infinite, which is an ideal design. In actual processing, there are differences between the radius of curvature caused by processing errors and the ideal radius of curvature.

[0086] In Figure 5 the optical system 50 shown, the chromatic aberration Δθ of the windshield correction lens 504 CF1 and the chromatic aberration Δθ of the waveguide coupling module 502 CF2 satisfy: (Δθ CF1 + Δθ CF2 ) = 0.3 mrad. The optical power Φ of the windshield 510 1 and the optical power Φ of the windshield correction lens 504 2 satisfy: (Φ 1 + Φ 2 ) = 0.05 m -1 .

[0087] For the display device 500, other descriptions of the projection module 501, waveguide coupling module 502, surface relief optical waveguide 503, and windshield correction lens 504 included therein can be referred to the corresponding parts in the above Figure 2 and will not be elaborated here.

[0088] Figure 6 FIG. 30 is a schematic structural diagram of an optical imaging system 60 constituted by a second display device 600 provided in 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 includes a projection module 601, a waveguide coupling module 602, a geometric mirror array optical waveguide 603, and a Fresnel lens 604. Among them, the waveguide coupling module 502 includes a first lens 621, a second lens 622, a first mirror 623, and a second mirror 624 arranged in sequence along the transmission direction of the image light, and the first lens 621 is a doublet lens.

[0089] Specifically, when the optical system 60 operates, the projection module 601 emits image light to the waveguide coupling module 602. The image light sequentially passes through the first lens 621 and the second lens 622. After exiting from the second lens 622, it is reflected by the first mirror 623 and the second mirror 624 in sequence, and is coupled into the geometric mirror array optical waveguide 603 from the coupling region of the geometric mirror array optical waveguide 603. After being transmitted in the geometric mirror array optical waveguide 603, it exits from the coupling-out region of the geometric mirror array optical waveguide 603 into the Fresnel lens 604, and then is transmitted to the surface of the windshield 610 and is reflected by the windshield 610 into the human eye.

[0090] Exemplarily, Table 3 shows the relevant optical data of the Fresnel lens 604.

[0091] Table 3

[0092]

[0093] Exemplarily, Table 4 shows the relevant optical data of the waveguide coupling module 602.

[0094] Table 4

[0095]

[0096] Similarly, the absolute value of the radius of curvature R represents the size of the radius of curvature of the corresponding surface, and the positive and negative signs indicate the bending direction of the corresponding surface. The data in Table 3 and Table 4 above are not accurate values but only approximate values. A radius of curvature of infinity is an ideal design.

[0097] In Figure 6 the optical system 60 shown, the chromatic aberration Δθ CF1 of the Fresnel lens 604 and the chromatic aberration Δθ CF2 of the waveguide coupling module 602 satisfy: (Δθ CF1 + Δθ CF2 ) = -0.6 mrad. The optical power Φ 1 of the windshield 610 and the optical power Φ 2 of the Fresnel lens 604 satisfy: (Φ 1 + Φ 2 ) = 0.13 m -1 .

[0098] For the display device 600, other descriptions of the projection module 601, the waveguide coupling module 602, the geometric mirror array optical waveguide 603, and the Fresnel lens 604 included therein can be referred to the corresponding parts in the above Figure 2 , and will not be elaborated here.

[0099] Figure 7 FIG. 41 is a schematic structural diagram of an optical imaging system 70 constituted by a third display device 700 provided by 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. Among them, 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, and 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.

[0100] Specifically, when the optical system 70 operates, the projection module 701 emits image light towards the waveguide coupling module 702. After the image light sequentially transmits through the first lens 721 and the second lens 722, it is reflected by the reflective grating 723 and then coupled into the surface relief optical waveguide 703 from the coupling region of the surface relief optical waveguide 703. After transmitting in the surface relief optical waveguide 703, it exits from the coupling-out region of the surface relief optical waveguide 703 into the transmissive grating 704, and then transmits to the surface of the windshield 710 and is reflected by the windshield 710 into the human eye.

[0101] Exemplarily, Table 5 shows the relevant optical data of the transmissive grating 704.

[0102] Table 5

[0103] Surface number Surface type 1 Hologram 1

[0104] Exemplarily, Table 6 shows the relevant optical data of the waveguide coupling module 702.

[0105] Table 6

[0106]

[0107] Similarly, the absolute value of the radius of curvature R represents the size of the radius of curvature of the corresponding surface, and the positive or negative sign indicates the bending direction of the corresponding surface. The data in Table 5 and Table 6 are not accurate values but only approximate values. A radius of curvature of infinity is an ideal design.

[0108] In Figure 7 the shown optical system 70, the chromatic aberration Δθ CF1 of the transmissive grating 704 and the chromatic aberration Δθ CF2 of the waveguide coupling module 702 satisfy: (Δθ CF1 +Δθ CF2 ) = 1.8 mrad. The optical power Φ 1 of the windshield 710 and the optical power Φ 2 of the transmissive grating 704 satisfy: (Φ 1 +Φ 2 ) = 0.4 m -1 .

[0109] For the display device 700, for other descriptions of the projection module 701, the waveguide coupling module 702, the surface relief optical waveguide 703, and the windshield correction element transmissive grating 704 included therein, reference can be made to the corresponding parts in the above Figure 2 , and details are not elaborated here.

[0110] Figure 8Schematic diagram of the optical imaging system 80 constituted by the fourth display device 800 provided in the embodiments 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 optical waveguide 803, and a windshield correction lens 804. Among them, 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 mirror 822, and a transmissive grating 823 arranged in sequence along the transmission direction of the image light.

[0111] Specifically, when the optical system 80 operates, the projection module 801 emits image light to the waveguide coupling module 802. The image light first passes through the first lens 821 and is then reflected by the first mirror 822 to the transmissive grating 823. After exiting from the transmissive grating 823, it is coupled into the volume holographic grating optical waveguide 803 from the coupling region of the volume holographic grating optical waveguide 803. After being transmitted in the volume holographic grating optical waveguide 803, it exits from the coupling-out region of the volume holographic grating optical waveguide 803 and enters the windshield correction lens 804, and then is transmitted to the surface of the windshield 810 and is reflected by the windshield 810 into the human eye.

[0112] Exemplarily, Table 7 shows the relevant optical data of the windshield correction lens 804.

[0113] Table 7

[0114]

[0115] Exemplarily, Table 8 shows the relevant optical data of the waveguide coupling module 802.

[0116] Table 8

[0117]

[0118] Similarly, the absolute value of the radius of curvature R represents the size of the radius of curvature of the corresponding surface, and the positive and negative signs indicate the bending direction of the corresponding surface. The data in Table 7 and Table 8 above are not accurate values but only approximate values. A radius of curvature of infinity is an ideal design.

[0119] In Figure 8 the shown optical system 80, the chromatic aberration Δθ CF1 of the windshield correction lens 804 and the chromatic aberration Δθ CF2 of the waveguide coupling module 802 satisfy: (Δθ CF1 +Δθ CF2 ) = -1.6 mrad. The optical power Φ 1 of the windshield 810 and the optical power Φ 2 of the windshield correction lens 804 satisfy: (Φ 1 +Φ 2) = -0.07m - 1 。

[0120] For the display device 800, for other descriptions of the projection module 801, waveguide coupling module 802, optical waveguide 803, and windshield correction element 804 included therein, reference may be made to the corresponding parts in the above Figure 2 . Details are not described herein again.

[0121] It should be noted that the above Figures 5 to 8 are only partial embodiments provided by this application and do not limit the protection scope of this application. The above Figures 5 to 8 embodiments can be implemented independently or partially combined with each other. For example, Figure 5 in the illustrated embodiment, the waveguide coupling module 502 can be used in the Figure 6 illustrated embodiment, etc.

[0122] Figure 9 is a circuit schematic diagram of the display device provided by the embodiment of this application. As Figure 9 shown, 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, a modulator 1212, etc. Among them, the host 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 through a bus. The host processor 1201 can be referred to as a front-end processor.

[0123] In addition, the circuit diagrams illustrated in the embodiments of this application do not constitute a specific limitation on the display device. In other embodiments of this application, the display device may include more or fewer components than shown, or combine certain components, or split certain components, or have different component arrangements. The illustrated components can be implemented in hardware, software, or a combination of software and hardware.

[0124] Among them, 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 Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a video codec, a Digital Signal Processor (DSP), a baseband processor, and / or a Neural-Network Processing Unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors.

[0125] A memory may also be provided in the main processor 1201 for storing instructions and data. In some embodiments, the memory in the main processor 1201 is a cache memory. This memory can save the instructions or data that the main processor 1201 has just used or recycled. 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 the efficiency of the system.

[0126] In some embodiments, the display device may further include a plurality of input / output (I / O) interfaces 1208 connected to the main processor 1201. The interface 1208 may include an Inter-Integrated Circuit (I2C) interface, an Inter-Integrated Circuit Sound (I2S) interface, a Pulse Code Modulation (PCM) interface, a Universal Asynchronous Receiver / Transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a General-Purpose Input / Output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and / or a Universal Serial Bus (USB) interface, etc. The above I / O interfaces 1208 may be connected to devices such as a mouse, a touchpad, a keyboard, a camera, a speaker / speakerphone, a microphone, etc., and may also be connected to physical buttons on the display device (such as volume keys, brightness adjustment keys, power on / off keys, etc.).

[0127] The external memory interface 1202 may be used to connect an external memory card, such as a Micro SD card, to implement the storage capacity expansion of the display device. The external memory card communicates with the main processor 1201 through the external memory interface 1202 to implement the data storage function.

[0128] The internal memory 1203 may be used to store computer-executable program codes, and the executable program codes include instructions. The internal memory 1203 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, applications 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 Storage (UFS), etc. The main processor 1201 executes various functional applications and data processing of the display device by running the instructions stored in the internal memory 1203, and / or the instructions stored in the memory provided in the main processor 1201.

[0129] The display device can implement audio functions through the audio module 1204 and the application processor, etc. For example, music playback, calls, etc.

[0130] The audio module 1204 is used to convert digital audio information into an analog audio signal for output, and is also used to convert analog audio input into a digital audio signal. The audio module 1204 can also be used for encoding and decoding audio signals, such as for playing sound or recording. In some embodiments, the audio module 1204 can be disposed in the main processor 1201, or some functional modules of the audio module 1204 can be disposed in the main processor 1201.

[0131] The video interface 1209 can receive externally input audio - 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 externally. When the display device is used as a head - up display, the video interface 1209 can receive speed signals and power signals input by peripheral devices, and can also receive externally input AR video signals. When the display device is used as a projector, the video interface 1209 can receive video signals input by an external computer or terminal device.

[0132] The video module 1205 can decode the video input by the video interface 1209, such as performing H.264 decoding. The video module can also encode the video captured by the display device, such as performing H.264 encoding on the video captured by an external camera. In addition, the main processor 1201 can also decode the video input by the video interface 1209 and then output the decoded image signal to the display circuit 1210.

[0133] The display circuit 1210 and the modulator 1212 are used to display corresponding images. In this embodiment, the video interface 1209 receives an externally input video source signal. After the video module 1205 performs decoding and / or digitization processing, it outputs one or more image signals to the display circuit 1210. The display circuit 1210 drives the modulator 1212 according to the input image signal to image the incident polarized light, and then outputs image light. In addition, the main processor 1201 can also output one or more image signals to the display circuit 1210.

[0134] In this embodiment, the display circuit 1210 and the modulator 1212 belong to the above - mentioned Figure 8For the electronic components in the modulation unit 712 shown, the display circuit 1210 may be referred to as a driving circuit.

[0135] The power supply module 1206 is used to supply power to the main processor 1201 and the light source 1200 according to the input power (such as direct current). A rechargeable battery may be included in the power supply module 1206, and the rechargeable battery can supply power to the main processor 1201 and the light source 1200. The light emitted by the light source 1200 can be transmitted to the modulator 1212 for imaging, thereby forming an image optical signal.

[0136] The wireless communication module 1207 can enable the display device to communicate wirelessly with the outside world. It can provide solutions for wireless communication such as 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 (IR), etc. The wireless communication module 1207 can be one or more devices integrating at least one communication processing module. The wireless communication module 1207 receives electromagnetic waves via an antenna, performs frequency modulation and filtering processing on the electromagnetic wave signals, and sends the processed signals to the main processor 1201. The wireless communication module 1207 can also receive the signal to be sent from the main processor 1201, perform frequency modulation and amplification on it, and convert it into electromagnetic wave radiation through the antenna.

[0137] In addition, the video data decoded by the video module 1205 can be received not only through the video interface 1209 but also 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 the audio and video data stored in the external memory.

[0138] The above display device can be installed on a vehicle. Please refer to Figure 10 , Figure 10 which is a schematic diagram of a possible functional framework of a vehicle provided in an embodiment of this application.

[0139] As Figure 10As shown, the functional framework of a vehicle may include various subsystems, such as the sensor system 12, control system 14, one or more peripheral devices 16 (illustrated by one example), power supply 18, computer system 20, and head-up display system 22 in the figure. Optionally, the vehicle may further include other functional systems, such as an engine system that provides power to the vehicle, etc., which are not limited in this application.

[0140] Among them, the sensor system 12 may include several detection devices. These detection devices can sense the information to be measured and convert the sensed information into an electrical signal or other required form of information output according to a certain rule. As shown in the figure, these detection devices may include a global positioning system (GPS), vehicle speed sensor, inertial measurement unit (IMU), radar unit, laser rangefinder, camera device, wheel speed sensor, steering sensor, gear sensor, or other elements for automatic detection, etc., which are not limited in this application.

[0141] The control system 14 may include several elements, such as the steering unit, braking unit, lighting system, autonomous driving system, map navigation system, network time synchronization system, and obstacle avoidance system shown in the figure. Optionally, the control system 14 may further include elements such as a throttle controller and an engine controller for controlling the vehicle driving speed, etc., which are not limited in this application.

[0142] The peripheral device 16 may include several elements, such as the communication system, touch screen, user interface, microphone, and speaker, etc. shown in the figure. Among them, the communication system is used to realize network communication between the vehicle and other devices except the vehicle. In practical applications, the communication system may use wireless communication technology or wired communication technology to realize network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through a network cable or optical fiber, etc.

[0143] The power supply 18 represents a system that provides electricity or energy for the vehicle, which may include but is not limited to rechargeable lithium batteries or lead-acid batteries, etc. In practical applications, one or more battery components in the power supply are used to provide electrical energy or energy for vehicle startup, and the type and material of the power supply are not limited in this application.

[0144] Several functions of the vehicle are controlled and realized by the computer system 20. The computer system 20 may include one or more processors 2001 (illustrated by one processor as an example) and a memory 2002 (also referred to as a storage device). In practical applications, the memory 2002 may also be inside the computer system 20 or outside the computer system 20, such as a cache in the vehicle, etc., which are not limited in this application.

[0145] Among them,

[0146] 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 or the instructions corresponding to the programs stored in the memory 2002 to implement the corresponding functions of the vehicle.

[0147] The memory 2002 may include volatile memory, such as RAM; the memory may also include 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 the 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 this application, a set of program codes for vehicle control can be stored in the memory 2002, and the processor 2001 can call the program codes to control the vehicle to drive safely. How to achieve safe driving of the vehicle will be described in detail later in this application.

[0148] Optionally, in addition to storing program codes or instructions, the memory 2002 can also store information such as road maps, driving routes, sensor data, etc. The computer system 20 can combine with other elements in the vehicle function framework schematic diagram, such as sensors, GPS, etc. in the sensor system, to implement the relevant functions of the vehicle. For example, the computer system 20 can control the driving direction or driving speed of the vehicle based on the data input of the sensor system 12, which is not limited in this application.

[0149] The head-up display system 22 may include several elements, such as the windshield shown in the figure, a controller, and a head-up display. The controller 222 is used to generate an image according to a user instruction (for example, generate an image including vehicle states such as vehicle speed, power / oil quantity, and an image of augmented reality (AR) content), and send the image to the head-up display for display; the head-up display may include an image generation unit and a mirror combination. The windshield is used to cooperate with the head-up display to realize the optical path of the head-up display system, so as to present a target image in front of the driver. Among them, the functions of some elements in the head-up display system can also be implemented by other subsystems of the vehicle. For example, the controller can also be an element in the control system.

[0150] Among them, this application Figure 10It is shown that including four subsystems, the sensor system 12, the control system 14, the computer system 20, and the head-up display system 22 are only examples and do not constitute limitations. In practical applications, a vehicle can combine several components in the vehicle according to different functions to obtain corresponding subsystems with different functions. In practical applications, a vehicle may include more or fewer systems or components, which are not limited in this application.

[0151] The above-mentioned vehicle can be a sedan, a truck, a bus, a ship, an airplane, a helicopter, a recreational vehicle, a playground vehicle, a construction device, a tram, a golf cart, a train, etc., and no special limitation is made in the embodiments of this application.

[0152] Figure 11 It is a schematic functional block diagram of a mobile carrier 1100 provided by an embodiment of this application. The mobile carrier 1100 may include a sensing system 120, a display device 130, and a computing platform 150. Among them, the sensing system 120 may include one or more sensors that sense information about the environment around the mobile carrier 1100. For example, the sensing system 120 may include a positioning system, and the positioning system may be a global positioning system (GPS), or it may be a Beidou system or other positioning systems, an inertial measurement unit (IMU), a lidar, a millimeter-wave radar, an ultrasonic radar, and a camera device, or one or more of them.

[0153] Some or all functions of the mobile carrier 1100 may 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 may be a circuit with the ability to read and execute instructions, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a type of microprocessor), or a digital signal processor (DSP), etc.; in another implementation, the processor may implement certain functions through the logical relationship of a hardware circuit, and the logical relationship of the hardware circuit is fixed or can be reconfigured. 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 document to implement the configuration of the hardware circuit 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 a type of 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 may further include a memory for storing instructions, and some or all of the processors 151 to 15n may call the instructions in the memory and execute the instructions to implement 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 devices 500, 600, 700, and 800 in the above embodiments.

[0154] The mobile carrier in the present application may include land vehicles, water vehicles, air vehicles, or entertainment devices, etc. For example, the mobile carrier may be a vehicle, which is a vehicle in a broad sense and can be a transportation vehicle (such as a commercial vehicle, a passenger vehicle, a train, etc.), a recreational device, a toy vehicle, etc. The embodiments of the present application do not specifically limit the type of vehicle. Again, the mobile carrier may be a transportation vehicle such as an airplane or a ship.

[0155] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains.

[0156] The above 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 within the protection scope of the present application.

Claims

1. A display device, characterized in that, comprising: a projection module, a waveguide coupling module, an optical waveguide, and a windshield correction element, the projection module for projecting image light onto the waveguide coupling module; the waveguide coupling module for coupling the image light from the projection module into the optical waveguide and compensating for the chromatic aberration of the windshield correction element; the optical waveguide for emitting the image light from the waveguide coupling module to the windshield correction element; the windshield correction element for adjusting the transmission angle and / or transmission direction of the image light from the optical waveguide and emitting the adjusted image light to the windshield glass.

2. The display device according to claim 1, characterized in that, The color difference Δθ of the windshield correction element CF1 and the color difference Δθ of the waveguide coupling module CF2 satisfy: -3mrad ≤ (Δθ CF1 + Δθ CF2 ) ≤ 3mrad where, Δθ CF1 represents the angular deviation between the C light and the F light corresponding to the windshield correction element at the maximum field of view angle θ, Δθ CF2 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 656 nm, the wavelength of the F light is 486 nm, and mrad is the unit of measurement in milliradians, Δθ CF1 and Δθ CF2 have opposite signs.

3. The display device according to claim 2, characterized in that, The optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: -0.5m -1 ≤(Φ 1 +Φ 2 )≤0.5m -1 。 4. The display device according to claim 2 or 3, characterized in that, The color difference Δθ of the windshield correction element CF1 and the color difference Δθ of the waveguide coupling module CF2 satisfy: (Δθ CF1 +Δθ CF2 ) = 0.3 mrad.

5. The display device according to claim 3 or 4, characterized in that, The optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = 0.05 m -1 .

6. The display device according to claim 5, characterized in that, the windshield correction element is a lens with an extended polynomial surface type, 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 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.

8. The display device according to claim 2 or 3, characterized in that, The color difference Δθ of the windshield correction element CF1 and the color difference Δθ of the waveguide coupling module CF2 meet the following condition: (Δθ CF1 +Δθ CF2 ) = -0.6 mrad.

9. The display device according to claim 3 or 8, characterized in that, The optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = 0.13 m -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 mirror.

11. The display device according to claim 10, characterized in that, the waveguide coupling module includes a first lens, a second lens, a first mirror, and a second mirror arranged in sequence along the transmission direction of the image light, and the first lens is a doublet lens.

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

13. The display device according to claim 3 or 12, characterized in that, The optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = 0.4 m -1 。 14. The display device according to claim 13, characterized in that, the windshield correction element is a transmissive grating, and the waveguide coupling module includes a plurality of lenses and a reflective grating.

15. The display device according to claim 14, characterized in that, the waveguide coupling module includes a first lens, a second lens, and a reflective grating arranged in sequence along the transmission direction of the image light, and the first lens is a doublet lens.

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

17. The display device according to claim 3 or 16, characterized in that, The optical power Φ of the windshield 1 and the optical power Φ of the windshield correction element 2 satisfy: (Φ 1 + Φ 2 ) = -0.07 m -1 .

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

19. The display device according to claim 18, characterized in that, The waveguide coupling module includes a first lens, a first mirror, and a transmissive grating arranged in sequence along the transmission direction of the image light.

20. The display device according to any one of claims 1 to 19, wherein, the windshield correction element is further configured to serve as a dust cover of the display device.

21. The display device according to any one of claims 1 to 19, wherein, the display device further includes a dust cover, and the windshield correction element is fixed integrally with the dust cover.

22. A cockpit system, wherein, it includes the display device according to any one of claims 1 to 21 and an instrument panel, and the display device is installed in the instrument panel.

23. A vehicle, wherein, it includes the windshield and the display device according to any one of claims 1 to 21 or includes the cockpit system according to claim 22.

Images