Imaging structure and imaging method for vehicle window, and vehicle

Abstract

The application discloses an imaging structure of a vehicle window, an imaging method and a vehicle, and belongs to the technical field of vehicles. The imaging structure of the vehicle window comprises a vehicle window glass, a first film assembly and a light source assembly. The first film assembly is arranged in the vehicle window glass, and comprises a first holographic film and a second holographic film which are arranged in a stacking mode along the thickness direction of the vehicle window glass. By arranging the first holographic film and the second holographic film in a stacking mode along the thickness direction in the vehicle window glass, the two holographic films occupy a smaller area of the surface of the vehicle window glass in the same area of the surface of the vehicle window glass, and the utilization rate of space is improved. When the light source assembly provides light of a corresponding preset wavelength, the first holographic film can generate a virtual image, the second holographic film can generate a real image, the same position of the vehicle window glass can provide a real image and a virtual image for a user as required, the diversity of imaging is improved, the use demand is better met, and the switching of the real image and the virtual image is facilitated by controlling light of different wavelengths.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an imaging structure, imaging method and vehicle for a vehicle window. Background Technology

[0002] In holographic projection glass technology, the term typically refers to a technique that integrates holographic optical elements (such as holographic films or holographic diffraction structures) into the interior or surface of a glass substrate. This technology enables the glass to control the diffraction of specific incident light by recording microstructures formed by interference on the holographic film. When light of matched wavelength and angle shines onto the holographic optical elements, these microstructures direct the light diffracted in a predetermined direction, thereby forming a corresponding image at a specific location.

[0003] When holographic projection glass technology is used in vehicles, the holographic optical elements are placed inside the car window glass. Only a single imaging effect can be achieved in the same position, which gradually becomes unable to meet the needs of use. Summary of the Invention

[0004] This application provides an imaging structure, imaging method, and vehicle for a vehicle window, in order to solve the technical problem that the holographic projection glass structure on a vehicle can only achieve a single imaging effect at the same location.

[0005] To achieve the above objectives, according to a first aspect of this application, an imaging structure for a vehicle window is provided, comprising: Car window glass; A first film assembly is disposed inside the vehicle window glass. The first film assembly includes a first holographic film and a second holographic film stacked along the thickness direction of the vehicle window glass. A light source assembly is used to provide light with a first preset wavelength to the first holographic film and to provide light with a second preset wavelength to the second holographic film, wherein the first preset wavelength and the second preset wavelength are different. The first holographic film is configured to generate a virtual image when receiving light of the first preset wavelength, and the second holographic film is configured to generate a real image when receiving light of the second preset wavelength.

[0006] In some embodiments, the first holographic film has a first microstructure, which is used to diffract light having the first preset wavelength toward a first field of view or a second field of view and generate a virtual image. The second holographic film has a second microstructure, which is used to diffract light with the second preset wavelength toward the direction of the first field of view or the direction of the second field of view, and to generate a real image; The directions of the first field of view and the second field of view are different.

[0007] In some embodiments, the imaging structure of the vehicle window further includes: The second film assembly is disposed inside the window glass and arranged along the thickness direction with the first film assembly. The light source assembly is used to provide light to the second film assembly so that the second film assembly produces a real image and / or a virtual image.

[0008] In some embodiments, the second membrane assembly includes: The third holographic film is stacked with the first holographic film and the second holographic film along the thickness direction, and the light source assembly is used to provide light with a third preset wavelength to the third holographic film; The third holographic film has a third microstructure, which is used to diffract light with the third preset wavelength toward the direction of the first field of view or the direction of the second field of view, and to generate a real image. The first preset wavelength, the second preset wavelength, and the third preset wavelength are all different.

[0009] In some embodiments, the second membrane assembly further includes: The fourth holographic film is stacked with the first holographic film, the second holographic film, and the third holographic film along the thickness direction, and the light source assembly is used to provide light with a fourth preset wavelength to the fourth holographic film; The fourth holographic film has a fourth microstructure, which is used to diffract light with the fourth preset wavelength toward the direction of the first field of view or the direction of the second field of view, and generate a virtual image. The first preset wavelength, the second preset wavelength, the third preset wavelength, and the fourth preset wavelength are all different.

[0010] In some embodiments, the first holographic film is disposed facing the light source assembly, the second holographic film is disposed on the side of the first holographic film opposite to the light source assembly, the third holographic film is disposed on the side of the second holographic film opposite to the first holographic film, and the fourth holographic film is disposed on the side of the third holographic film opposite to the second holographic film.

[0011] In some embodiments, the vehicle window glass includes an outer glass layer and an inner glass layer arranged at intervals along the thickness direction, and a plurality of isolation films disposed between the outer glass layer and the inner glass layer and arranged at intervals along the thickness direction; The first holographic film, the second holographic film, the third holographic film, and the fourth holographic film are all provided with the isolation film on both sides along the thickness direction.

[0012] In some embodiments, the light source assembly includes: Multiple optical engines are provided, each of which is used to provide light of different wavelengths to the first membrane assembly and the second membrane assembly.

[0013] According to a second aspect of this application, a vehicle is provided, including an imaging structure for the window as described in any one of the above-mentioned claims.

[0014] According to a third aspect of this application, an imaging method for a vehicle window is provided, applied to the imaging structure of the vehicle window described above, or applied to the vehicle described above, the imaging method for the vehicle window comprising: The light source assembly provides light with a first preset wavelength to the first holographic film in the first film assembly, so that the first holographic film produces a virtual image; The light source assembly provides light with a second preset wavelength to the second holographic film in the first film assembly, so that the second holographic film produces a real image.

[0015] The imaging structure of a vehicle window according to an embodiment of this application includes a window glass, a first film assembly, and a light source assembly. The first film assembly is disposed within the window glass and includes a first holographic film and a second holographic film stacked along the thickness direction of the window glass. The light source assembly provides light with a first preset wavelength to the first holographic film and light with a second preset wavelength to the second holographic film; the first and second preset wavelengths are different. The first holographic film is configured to generate a virtual image when receiving light of the first preset wavelength, and the second holographic film is configured to generate a real image when receiving light of the second preset wavelength. By providing the first and second holographic films stacked along the thickness direction within the window glass, the two holographic films occupy a smaller area of ​​the window glass surface in the same region, thus improving space utilization. When light of a preset wavelength is provided by the light source component, the first holographic film can produce a virtual image, and the second holographic film can produce a real image. This allows the same position on the car window to provide the user with both a real and a virtual image as needed, improving the diversity of imaging and better meeting user needs. Furthermore, the switching between real and virtual images is convenient by controlling different wavelengths of light. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0018] Figure 1 This is a schematic diagram of the imaging structure of a vehicle window provided in an exemplary embodiment of the present disclosure, wherein the structure includes a first membrane assembly; Figure 2 This is a schematic diagram of the structure of the first holographic film provided in an exemplary embodiment of this disclosure; Figure 3 This is a schematic diagram of the structure of the second holographic membrane provided in an exemplary embodiment of this disclosure; Figure 4 This is a schematic diagram of the imaging structure of a vehicle window provided in an exemplary embodiment of this disclosure, wherein the structure includes a first membrane assembly and a second membrane assembly; Figure 5 This is a schematic diagram of the imaging structure of a vehicle window provided in an exemplary embodiment of the present disclosure, wherein the structure includes a first holographic film, a second holographic film and a third holographic film; Figure 6 This is a schematic diagram of the imaging structure of a vehicle window provided in an exemplary embodiment of this disclosure, wherein light is diffracted in the direction of the first field of view; Figure 7 This is a schematic diagram showing the arrangement of multiple holographic films and isolation films in a vehicle window glass provided in an exemplary embodiment of this disclosure; Figure 8 This is a schematic diagram of the structure of the first holographic film presenting a virtual image provided in an exemplary embodiment of this disclosure; Figure 9 This is a schematic diagram of the structure of the second holographic film presenting a real image provided in an exemplary embodiment of this disclosure; Figure 10 This is a flowchart of an imaging method for a vehicle window provided in an exemplary embodiment of this disclosure.

[0019] Explanation of reference numerals in the attached figures: 10-First membrane assembly; 11-First holographic membrane; 111-First microstructure; 12-Second holographic membrane; 121-Second microstructure; 20-Light source assembly; 21-Optical mechanism; 30-Second membrane assembly; 31-Third holographic membrane; 311-Third microstructure; 32-Fourth holographic membrane; 321-Fourth microstructure; 40-First field of view; 50-Second field of view; 60-Window glass; 61-Outer glass; 62-Inner glass; 63-Separation membrane; X-Thickness direction. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0021] In the field of holographic projection displays, especially in automotive applications, information projection is often achieved by setting holographic optical elements or holographic films on a glass substrate. This technology records specific optical interference fringes (microstructures) on the holographic film, enabling it to diffract incident light and thus form a real or virtual image at a specific location.

[0022] However, in existing holographic films, the microstructure is fixed once exposed and cured during processing, resulting in consistent optical effects of the diffraction structure within the same area or unit structure of the glass. This means that for a specific location or unit area on the glass, the optical function of the corresponding holographic structure is singular and immutable. Specifically, this area is predefined as having only one imaging mode: either forming a real image or only forming a virtual image. For example, if this area on the glass is set for an augmented reality head-up display, it can only form a virtual image blended with a distant road scene, and cannot be switched at the same location on the glass to a close-up real image display for audio-visual entertainment; and vice versa. Therefore, when users want to flexibly switch imaging modes within the same glass area according to different usage scenarios, the current single-layer fixed holographic film structure cannot meet this requirement, and cannot provide both real and virtual images at the same location on the glass as needed.

[0023] Please see Figure 1 This application provides an imaging structure for a vehicle window, including a window glass 60, a first film assembly 10, and a light source assembly 20. The first film assembly 10 is disposed within the window glass 60 and includes a first holographic film 11 and a second holographic film 12 stacked along the thickness direction X of the window glass 60. The light source assembly 20 is used to provide light with a first preset wavelength to the first holographic film 11 and to provide light with a second preset wavelength to the second holographic film 12, wherein the first preset wavelength and the second preset wavelength are different. The first holographic film 11 is configured to generate a virtual image when receiving light of the first preset wavelength, and the second holographic film 12 is configured to generate a real image when receiving light of the second preset wavelength.

[0024] It is understandable that by stacking two holographic films with different optical properties along the thickness direction X in the same area of ​​the window glass 60, and cooperating with the light source component 20 that provides light of the corresponding wavelength, it is possible to present both virtual and real images at the same physical position of the window glass 60.

[0025] Specifically, during the processing of the car window glass 60, the photosensitive materials and microstructures of the first holographic film 11 and the second holographic film 12 are pre-configured to respond to incident light of different wavelengths and guide them to imaging paths for virtual or real images, respectively. The photosensitive materials used to process the first holographic film 11 and the second holographic film 12 can be silver halide latex, dichromate gelatin, or photosensitive polymers, etc.; the microstructures are physical structures with specific periodic or non-periodic arrangements formed inside or on the surface of the photosensitive materials through holographic exposure technology, capable of diffracting light of specific wavelengths.

[0026] Therefore, when the light source assembly 20 selectively provides light with a first preset wavelength to the first holographic film 11, the first holographic film 11 can be activated, causing it to diffract a virtual image; similarly, light with a second preset wavelength can be provided to the second holographic film 12, activating it and causing it to diffract a real image. This structure allows for the provision of virtual or real images, or both, to the user within the same glass area as needed, without requiring the window glass 60 to be divided into sections. This not only saves effective display area on the glass surface but also makes switching imaging modes more flexible and convenient, increasing the diversity of imaging at the same position on the window glass 60 and better meeting user needs. Furthermore, since the two holographic films are stacked in the thickness direction X, they occupy the same planar space as a single-layer film, which is beneficial for achieving multi-functional integration within a limited window area, improving the space utilization and layout freedom of the first film assembly 10.

[0027] By controlling the on and off of light of different wavelengths on the corresponding light source component 20, users can quickly switch imaging types according to different scene requirements. For example, when using the augmented reality head-up display function, the light source component 20 can emit light of a first preset wavelength to the first holographic film 11, causing the first holographic film 11 to feed back the corresponding virtual image; when using audio-visual entertainment on the glass, the light source component 20 can emit light of a second preset wavelength to the second holographic film 12, causing the second holographic film 12 to feed back the corresponding real image, making the window imaging structure versatile. The first preset wavelength light and the second preset wavelength light do not interfere with each other.

[0028] When a first holographic film 11 and a second holographic film 12 are installed inside the vehicle window glass 60, their positions in the thickness direction X are not limited, and can be arranged as follows: Figure 1As shown, the first holographic film 11 is disposed on the side closer to the user or the light source component 20, and the second holographic film 12 is disposed on the side of the first holographic film 11 away from the user or the light source component 20; alternatively, the second holographic film 12 can be disposed on the side closer to the user or the light source component 20, and the first holographic film 11 can be disposed on the side of the second holographic film 12 away from the user or the light source component 20, but this arrangement is not shown in the figure.

[0029] Please see Figure 1 , Figure 2 and Figure 3 In conjunction with the above embodiments, in some embodiments, the first holographic film 11 has a first microstructure 111, which is used to diffract light with a first preset wavelength toward either the first field of view 40 or the second field of view 50 to generate a virtual image. The second holographic film 12 has a second microstructure 121, which is used to diffract light with a second preset wavelength toward either the first field of view 40 or the second field of view 50 to generate a real image. The directions of the first field of view 40 and the second field of view 50 are different.

[0030] It is understood that the surface or interior of the first holographic film 11 is provided with a specific first microstructure 111. This first microstructure 111 is an interference fringe pattern pre-formed by a holographic exposure process, which has corresponding fringe spacing, orientation, and shape, and can generate a diffraction response to light with a first preset wavelength from the light source component 20. When such light is incident on the first holographic film 11, the first microstructure 111 will deflect the light to a preset first field of view 40 or second field of view 50 according to its optical properties, and form a virtual image located at a distance or behind the glass in the corresponding direction, such as for driving information in augmented reality head-up displays. Similarly, the second holographic film 12 is provided with a second microstructure 121 that is different from the first microstructure 111. At least one of the fringe spacing, orientation, and shape of the second microstructure 121 is different from that of the first microstructure 111. When the second microstructure 121 receives light with a second preset wavelength, it can diffract the light to the direction of the first field of view 40 or the direction of the second field of view 50, and form a real image on the glass, which is suitable for audio-visual entertainment and other scenarios.

[0031] The imaging of the aforementioned holographic films essentially utilizes the principles of light interference and diffraction. During the fabrication of the holographic films, for example, when fabricating the first holographic film 11 and the second holographic film 12, these two films first need to be treated with lasers of specific wavelengths. This causes the interior of the photosensitive material on the first holographic film 11 to form a precise first microstructure 111, and the interior of the photosensitive material on the second holographic film 12 to form a dense second microstructure 121. These microstructures are essentially physical gratings, recording information such as the amplitude and phase of the light waves. During the use of the holographic films, when the light source assembly 20 emits light of a specific angle and wavelength towards these holographic films, the microstructures on the holographic films can diffract the incident light. The wavefront of the diffracted light wave precisely reconstructs the information of the object's light wave when the holographic film initially recorded it, thus forming a three-dimensional image in the human eye. The phase information recorded by the microstructures determines whether the resulting image is a real or virtual image. A virtual image requires the diffracted light wave to record a plane wave or a diverging spherical wave; a real image requires the recording of a converging spherical wave. Among them, the wavefront refers to the surface formed by points with the same vibration phase during the propagation of light. It intuitively describes the "shape" of light. It can be a parallel plane wave, a divergent spherical wave that spreads outward from the light source, or a converging spherical wave that converges to a point. The shape of the wavefront directly determines the realism or virtuality of the image.

[0032] Specifically, when the first microstructure 111 on the first holographic film 11 is irradiated with light of a first preset wavelength, the first microstructure 111 generates a divergent wavefront of the incident light. When the human eye receives this light, the brain traces it along the backward extension of the light rays, thus seeing a virtual image behind the glass. This is similar to looking at the scenery outside the window through a window; the light is divergent, as if it were located on the other side of the glass. For example, the distance between the light source component 20 and the car window glass 60 is 300mm, and the distance between the human eye and the car window glass 60 is 800mm. The first microstructure 111 is a hexagonal 16-sided array, and the interference fringes on its surface are sinusoidal fringes, forming a sinusoidal grating. In the first preset wavelength light, the wavelength of red light is 630nm, the wavelength of green light is 530nm, and the wavelength of blue light is 460nm. The period or spacing of red light is 15.76μm, the period or spacing of green light is 13.26μm, and the period or spacing of blue light is 11.51μm. The tilt angle of the interference fringe plane relative to the normal of the holographic film surface is 2.29°. The structural depth or thickness of the interference fringes corresponding to red light on the holographic film is 606nm, the structural depth or thickness of the interference fringes corresponding to green light is 510nm, and the structural depth or thickness of the interference fringes corresponding to blue light is 442nm. The refractive index of the material of the first microstructure 111 is 1.52, and the incident angle of the light of the first preset wavelength is 2.29°. After satisfying the above conditions, when the surface of the first holographic film 11 is irradiated by the light of the first preset wavelength, the sinusoidal interference fringes on the first holographic film 11 cause the diffracted light wavefront to become a diverging spherical wave, thereby causing the first holographic film 11 to diffract a diverging virtual image. This virtual image can be formed at a certain distance in front of the vehicle, such as 20m. Figure 8 As shown.

[0033] When the second microstructure 121 on the second holographic film 12 is illuminated by light of a second preset wavelength, the second microstructure 121 generates a converging diffraction wavefront on the incident light, which will actually converge on the car window glass 60 to form a real image on the glass. This is similar to a projector lens converging light onto a screen. For example, the distance between the light source assembly 20 and the car window glass 60 is 300mm, the distance between the human eye and the car window glass 60 is 800mm, the second microstructure 121 is a triangular icosahedral array, and the interference fringes on its surface are straight fringes, forming a rectangular straight grating. In the second preset wavelength light, the wavelength of red light is 620nm, the wavelength of green light is 520nm, and the wavelength of blue light is 450nm. The period or spacing of red light is 15.51μm, the period or spacing of green light is 13.01μm, and the period or spacing of blue light is 11.26μm. The tilt angle of the interference fringe plane relative to the normal of the holographic film surface is 2.29°. The structural depth or thickness of the interference fringes on the holographic film corresponding to red light is 298 nm, the structural depth or thickness of the interference fringes corresponding to green light is 250 nm, and the structural depth or thickness of the interference fringes corresponding to blue light is 216 nm. The refractive index of the material of the second microstructure 121 is 1.52, and the incident angle of the light of the second preset wavelength is 2.29°. After satisfying the above conditions, when the surface of the second holographic film 12 is irradiated by light of the second preset wavelength, the straight interference fringes on the second holographic film 12 cause the diffracted light wavefront to exhibit a converging spherical wave, causing the second holographic film 12 to diffract a converging real image, such as... Figure 9 As shown.

[0034] In this application, the first field of view 40 and the second field of view 50 have different directions. By setting parameters such as the shape of the first microstructure 111 and the second microstructure 121, light of a corresponding wavelength can be diffracted towards the direction of a specific field of view, so that the diffracted image can only be seen at the location of the corresponding field of view. For example, if the first microstructure 111 diffracts a virtual image towards the direction of the first field of view 40, then the virtual image can only be seen at the location of the first field of view 40; if the second microstructure 121 diffracts a real image towards the direction of the second field of view 50, then the real image can only be seen at the location of the second field of view 50. Therefore, this structure can provide a certain degree of privacy protection for the imaged content, and also provide a certain degree of anti-interference, ensuring that the imaged content does not interfere with the locations of other fields of view.

[0035] Specifically, the first field of view 40 can be oriented towards the driver's seat, and the second field of view 50 can be oriented towards the passenger's seat. This structure can provide a virtual image to the driver's seat and a real image to the passenger's seat; alternatively, it can provide a real image to the driver's seat and a virtual image to the passenger's seat. Therefore, because the first and second fields of view 40 are oriented differently, this structure can guide light of different imaging types to the locations of different occupants or different observation areas within the vehicle. This structure not only achieves two imaging functions within the same glass area but also, through the selective response of the microstructure to different wavelengths of light and the control of diffraction direction, achieves the allocation of imaging content and viewing direction, providing a certain degree of privacy protection and anti-interference effect.

[0036] Please see Figure 4 In conjunction with the above embodiments, in some embodiments, the imaging structure of the vehicle window further includes a second film assembly 30. The second film assembly 30 is disposed inside the vehicle window glass 60 and arranged with the first film assembly 10 along the thickness direction X. The light source assembly 20 is used to provide light to the second film assembly 30 so that the second film assembly 30 can generate a real image or a virtual image, or both.

[0037] Understandably, a first film assembly 10 and a second film assembly 30 can be simultaneously installed within the window glass 60. The two film assemblies can be positioned on the same area of ​​the window glass 60 surface, reducing the use of other areas of the window glass 60 by the second film assembly 30 and improving space utilization. When the second film assembly 30 is in use, the light source assembly 20 can also provide light of a specific wavelength to the second film assembly 30, thereby enabling the second film assembly 30 to produce a real image, a virtual image, or both.

[0038] By adding a second film assembly 30, the number of independently controllable imaging channels can be further increased within the same plane area of ​​the same window glass 60, building upon the imaging function already achieved by the first film assembly 10. This allows the structure to simultaneously provide corresponding display content for more users, such as providing independent entertainment real images or information virtual images for different seats. For example, when the first film assembly 10 and the second film assembly 30 are used together, the first holographic film 11 in the first film assembly 10 can provide a virtual image in the direction of the first field of view 40, and the second holographic film 12 can provide a real image in the direction of the second field of view 50. The second film assembly 30 can also provide a real image in the direction of the first field of view 40, or a virtual image in the direction of the second field of view 50, or both, as needed.

[0039] Please see Figure 5In conjunction with the above embodiments, in some embodiments, the second film assembly 30 includes a third holographic film 31. The third holographic film 31 is stacked with the first holographic film 11 and the second holographic film 12 along the thickness direction X. The light source assembly 20 provides light with a third preset wavelength to the third holographic film 31. The third holographic film 31 has a third microstructure 311, which is used to diffract light with the third preset wavelength towards the direction of the first field of view 40 or the direction of the second field of view 50, thereby generating a real image. The first preset wavelength, the second preset wavelength, and the third preset wavelength are all different. The imaging principle of the third holographic film 31 is the same as that of the second holographic film 12.

[0040] It is understandable that by setting a third holographic film 31 in the same area on the surface of the car window glass 60, and setting a third microstructure 311 on the third holographic film 31, the third microstructure 311 is an interference fringe pattern pre-formed by the holographic exposure process, which is set with corresponding fringe spacing, orientation and shape, it can generate a diffraction response to light with a third preset wavelength from the light source component 20, and can diffract the light in the direction of the first field of view 40 or the second field of view 50, and generate a corresponding real image.

[0041] Because the light of the third preset wavelength responded to by the third holographic film 31 has a different wavelength than the corresponding light responded to by the holographic film in the first film assembly 10, the light of the third preset wavelength does not interfere with the light of the first preset wavelength and the light of the second preset wavelength. This allows the structure to further increase the amount of displayed content or the target audience without increasing the area of ​​the glass display area. For example, the third holographic film 31 can be configured to project a real-image image for entertainment onto another specific location inside the vehicle, such as the driver's seat, the passenger seat, or the rear seats, thereby providing display content for more locations on the physically limited window glass 60.

[0042] Please see Figure 4In conjunction with the above embodiments, in some embodiments, the second film assembly 30 further includes a fourth holographic film 32. The fourth holographic film 32 is stacked with the first holographic film 11, the second holographic film 12, and the third holographic film 31 along the thickness direction X. The light source assembly 20 provides light with a fourth preset wavelength to the fourth holographic film 32. The fourth holographic film 32 has a fourth microstructure 321, which is used to diffract the light with the fourth preset wavelength towards the direction of the first field of view 40 or the direction of the second field of view 50, thereby generating a virtual image. The first, second, third, and fourth preset wavelengths are all different. Among the multiple holographic films, each holographic film only responds to light of its corresponding preset wavelength and does not respond to light of other wavelengths; light of other wavelengths will pass through the holographic film. The imaging principle of the fourth holographic film 32 is the same as that of the first holographic film 11.

[0043] Understandably, the second film assembly 30 further includes a fourth holographic film 32, which is stacked together with the first holographic film 11, the second holographic film 12, and the third holographic film 31 along the thickness direction X of the window glass 60. The light source assembly 20 can provide light with a fourth preset wavelength to the fourth holographic film 32. The fourth holographic film 32 has a fourth microstructure 321, which is also an interference fringe pattern pre-formed by a holographic exposure process. It has corresponding fringe spacing, orientation, and shape, and can generate a diffraction response to light with the fourth preset wavelength from the light source assembly 20. It can diffract these rays to the direction of a preset first field of view 40 or a second field of view 50, or other directions, and form a virtual image in the corresponding direction.

[0044] By setting a fourth holographic film 32, the imaging structure adds an independent optical channel for generating virtual images within the same glass plane area, building upon the existing three layers that integrate real and virtual image functions. Since the fourth preset wavelength of light responded to by the fourth holographic film 32 differs from the corresponding wavelengths responded to by the holographic film in the first film assembly 10 and the third holographic film 31, the fourth preset wavelength of light does not interfere with the first, second, and third preset wavelengths. Combined with the previous holographic films, the required virtual and real image combinations can be independently provided to different locations within the vehicle simultaneously on the same glass area. For example, a virtual image for augmented reality head-up display and a real image for entertainment can be provided to the driver's seat, as well as the virtual image for augmented reality head-up display and a real image for entertainment to the passenger's seat, or corresponding real or virtual images can be provided to the rear seats. This achieves efficient integration of multi-user needs within a limited glass area while maintaining structural compactness.

[0045] The first holographic film 11 and the fourth holographic film 32 can produce virtual images with the same content, while the second holographic film 12 and the third holographic film 31 can produce real images with the same content. When privacy protection is required, one of the holographic films producing the virtual image and the other producing the real image can be activated individually, so that only one image can be seen at a given viewing position. For example, activating only the first holographic film 11 and the second holographic film 12 allows the virtual image produced by the first holographic film 11 to be seen at one viewing position, while the real image produced by the second holographic film 12 can be seen at another viewing position. When screen sharing is required, the first holographic film 11 and the fourth holographic film 32 can be activated simultaneously, allowing the same real image to be seen at two different viewing positions; or the second holographic film 12 and the third holographic film 31 can be activated simultaneously, allowing the same virtual image to be seen at two different viewing positions.

[0046] Please see Figure 4 In conjunction with the above embodiments, in some embodiments, the first holographic film 11 is disposed facing the light source assembly 20, the second holographic film 12 is disposed on the side of the first holographic film 11 away from the light source assembly 20, the third holographic film 31 is disposed on the side of the second holographic film 12 away from the first holographic film 11, and the fourth holographic film 32 is disposed on the side of the third holographic film 31 away from the second holographic film 12.

[0047] It is understandable that the first holographic film 11, the second holographic film 12, the third holographic film 31, and the fourth holographic film 32 are arranged sequentially along the thickness direction X of the window glass 60, from the direction closest to the light source assembly 20 to the direction furthest from the light source assembly 20. Each holographic film has a selective response to light of a specific wavelength. That is, when light reaches the holographic film that matches its preset wavelength, the microstructure on the film layer will diffract it to form an image of the corresponding type; while for light of a different wavelength, the film layer exhibits higher transmittance, allowing it to continue to propagate to subsequent film layers. Since the imaging structure of this window preferentially uses the first holographic film 11 and the second holographic film 12 on the first film assembly 10 for the driver's or passenger's position to view the corresponding real or virtual image, the first holographic film 11 and the second holographic film 12 are positioned closer to the light source assembly 20, so that the corresponding light has higher energy to illuminate the corresponding holographic film, making the holographic film produce a clearer real or virtual image, allowing the user to preferentially use the first film assembly 10. When light of the corresponding wavelength passes through the first membrane assembly 10 and shines on the third holographic film 31 and the fourth holographic film 32, some energy will be lost. The clarity of the resulting image may be less than that of the images produced by the first holographic film 11 and the second holographic film 12. Therefore, the third holographic film 31 and the fourth holographic film 32 can be used as backup film layers. When the first membrane assembly 10 is damaged, or the light source assembly 20 cannot emit light of the corresponding wavelength to the first membrane assembly 10, the second membrane assembly 30 can be used, thereby continuing to meet the user's needs to a certain extent.

[0048] Please see Figure 4 and Figure 7 In conjunction with the above embodiments, in some embodiments, the vehicle window glass 60 includes an outer glass layer 61 and an inner glass layer 62 arranged at intervals along the thickness direction X, and a plurality of isolation films 63 disposed between the outer glass layer 61 and the inner glass layer 62 and arranged at intervals along the thickness direction X. Isolation films 63 are disposed on both sides of the first holographic film 11, the second holographic film 12, the third holographic film 31, and the fourth holographic film 32 along the thickness direction X.

[0049] Understandably, the first holographic film 11, the second holographic film 12, the third holographic film 31, and the fourth holographic film 32 are sequentially stacked between the outer glass layer 61 and the inner glass layer 62, and each holographic film has an isolation film 63 on both sides along the thickness direction X. This sandwich structure physically separates and fixes each holographic film by the isolation film 63, ensuring the accuracy and stability of the position of each holographic film inside the glass, and reducing the risk of optical interference or mechanical damage that may result from direct contact between the holographic films. The isolation film 63 is typically made of a transparent and uniform material, capable of efficiently transmitting light of various preset wavelengths, allowing light from the light source assembly 20 to pass through each isolation film 63 sequentially and reach the corresponding holographic film layer, reducing the risk of brightness loss or image quality degradation. In addition, the isolation film 63 provides reliable buffering and protection for the encapsulation of the multi-layer holographic film, enhancing the overall strength and environmental resistance of the window structure, which is beneficial for achieving long-term stable imaging effects under harsh conditions.

[0050] Please see Figure 4 and Figure 6 In conjunction with the above embodiments, in some embodiments, the light source assembly 20 includes a plurality of optical engines 21. The plurality of optical engines 21 are respectively used to provide light of different wavelengths to the first film assembly 10 and the second film assembly 30.

[0051] It is understood that each optical engine 21 can emit light with a specific wavelength, respectively used to provide illumination of a preset wavelength to the corresponding holographic film layers in the first film assembly 10 and the second film assembly 30. For example: Figure 4 As shown, the light source assembly 20 includes four optical engines 21: N, M, P, and Q. Each optical engine 21 emits light of a certain wavelength. Specifically, N emits light of a first preset wavelength to illuminate and activate the first holographic film 11, causing it to generate a virtual image in the direction of the first field of view 40; M emits light of a second preset wavelength to illuminate and activate the second holographic film 12, causing it to generate a real image in the direction of the second field of view 50; P emits light of a third preset wavelength to illuminate and activate the third holographic film 31, causing it to generate a real image in the direction of the first field of view 40; and Q emits light of a fourth preset wavelength to illuminate and activate the fourth holographic film 32, causing it to generate a virtual image in the direction of the second field of view 50.

[0052] This method of configuring an independent light source for each holographic film layer enables independent control of the imaging function of each film layer. By individually turning a specific optical engine 21 on or off, it is possible to precisely control whether the corresponding holographic film layer produces a virtual or real image, thereby meeting the needs and switching of display content and imaging modes. Furthermore, since each optical engine 21 only needs to output light of the wavelength required by its corresponding film layer, without providing broadband illumination, this not only improves light energy utilization and reduces the overall system's power consumption and heat dissipation requirements, but also helps to improve the contrast and color purity of the images in each channel. At the same time, this structure facilitates functional expansion and maintenance. If a new imaging function needs to be added, i.e., a new holographic film needs to be added, only a matching specific wavelength optical engine 21 needs to be added, without modifying the existing light source architecture.

[0053] This application also provides a vehicle including the imaging structure of the window described above, which has all the technical features and beneficial effects of the imaging structure of the window, and will not be described in detail here.

[0054] Please see Figure 4 and Figure 10 This application also provides an imaging method for a vehicle window, applied to the imaging structure of the vehicle window described above, or applied to the vehicle described above. The imaging method for the vehicle window includes: providing light with a first preset wavelength to a first holographic film 11 in a first film assembly 10 via a light source assembly 20, so that the first holographic film 11 generates a virtual image in the direction of a first field of view 40 or a second field of view 50. Providing light with a second preset wavelength to a second holographic film 12 in the first film assembly 10 via a light source assembly 20, so that the second holographic film 12 generates a real image in the direction of the first field of view 40 or the second field of view 50. Providing light with a third preset wavelength to a third holographic film 31 in a second film assembly 30 via a light source assembly 20, so that the third holographic film 31 generates a real image in the direction of the first field of view 40 or the second field of view 50. Providing light with a fourth preset wavelength to a fourth holographic film 32 in the second film assembly 30 via a light source assembly 20, so that the fourth holographic film 32 generates a virtual image in the direction of the first field of view 40 or the second field of view 50.

[0055] For example, the wavelengths of red, green, and blue light are represented by R, G, and B, respectively. The first holographic film 11 is made of a photosensitive material suitable for a certain wavelength band. The wavelengths of the light corresponding to this photosensitive material are R=630nm, G=530nm, and B=460nm. During the design and exposure activation of the first holographic film 11, the structure and interference fringes on the first microstructure 111 can be set according to the content to be imaged. The light source component 20 is an optomechanical 21 that can emit light of a corresponding wavelength. The light of the corresponding wavelength is the light of the first preset wavelength, with wavelengths of R=630nm, G=530nm, and B=460nm. The imaging range is the position of the first field of view 40, and the imaging effect is a virtual image. The second holographic film 12 is made of a photosensitive material suitable for a certain wavelength band. The wavelengths of the light corresponding to this photosensitive material are R=620nm, G=520nm, and B=450nm. During the design and exposure activation of the second holographic film 12, the structure and interference fringes on the second microstructure 121 can be set according to the content to be imaged. The light source component 20 is an optomechanical 21 that can emit light of the corresponding wavelength. The light of the corresponding wavelength is the light of the second preset wavelength, with wavelengths of R=620nm, G=520nm, and B=450nm. The imaging range is the position of the second field of view 50, and the imaging effect is a real image. The third holographic film 31 is made of a photosensitive material suitable for a certain wavelength band. The wavelengths of the light corresponding to this photosensitive material are R=640nm, G=540nm, and B=470nm. During the design and exposure activation of the third holographic film 31, the structure and interference fringes on the third microstructure 311 can be set according to the content to be imaged. The light source component 20 is an optomechanical 21 that can emit light of the corresponding wavelength. The light of the corresponding wavelength is the light of the third preset wavelength, with wavelengths of R=640nm, G=540nm, and B=470nm. The imaging range is the position of the first field of view 40, and the imaging effect is a real image. The fourth holographic film 32 is made of a photosensitive material suitable for a certain wavelength band. The wavelengths of the light corresponding to this photosensitive material are R=650nm, G=550nm, and B=480nm. During the design and exposure activation of the fourth holographic film 32, the structure and interference fringes on the fourth microstructure 321 can be set according to the content to be imaged. The light source component 20 is an optomechanical 21 that can emit light of the corresponding wavelength. The light of the corresponding wavelength is the light of the fourth preset wavelength, with wavelengths of R=650nm, G=550nm, and B=480nm. The imaging range is the position of the second field of view 50, and the imaging effect is a virtual image.

[0056] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An imaging structure for a vehicle window, characterized in that, include: Car window glass (60); The first film assembly (10) is disposed inside the window glass (60). The first film assembly (10) includes a first holographic film (11) and a second holographic film (12) stacked along the thickness direction (X) of the window glass (60). The light source assembly (20) is used to provide light with a first preset wavelength to the first holographic film (11) and to provide light with a second preset wavelength to the second holographic film (12), wherein the first preset wavelength and the second preset wavelength are different; The first holographic film (11) is configured to generate a virtual image when receiving light of the first preset wavelength, and the second holographic film (12) is configured to generate a real image when receiving light of the second preset wavelength.

2. The imaging structure of the vehicle window according to claim 1, characterized in that, The first holographic film (11) has a first microstructure (111), which is used to diffract light with the first preset wavelength toward the direction of the first field of view (40) or the direction of the second field of view (50) and generate a virtual image; The second holographic film (12) has a second microstructure (121), which is used to diffract light with the second preset wavelength toward the first field of view (40) or the second field of view (50) and generate a real image; The direction of the first field of view (40) is different from the direction of the second field of view (50).

3. The imaging structure of the vehicle window according to claim 2, characterized in that, The imaging structure of the vehicle window also includes: The second film assembly (30) is disposed inside the window glass (60) and arranged with the first film assembly (10) along the thickness direction (X). The light source assembly (20) is used to provide light to the second film assembly (30) so that the second film assembly (30) produces a real image and / or a virtual image.

4. The imaging structure of the vehicle window according to claim 3, characterized in that, The second membrane module (30) includes: The third holographic film (31) is stacked with the first holographic film (11) and the second holographic film (12) along the thickness direction (X), and the light source assembly (20) is used to provide light with a third preset wavelength to the third holographic film (31); The third holographic film (31) has a third microstructure (311), which is used to diffract light with the third preset wavelength toward the first field of view (40) or the second field of view (50) and generate a real image. The first preset wavelength, the second preset wavelength, and the third preset wavelength are all different.

5. The imaging structure of the vehicle window according to claim 4, characterized in that, The second membrane assembly (30) further includes: The fourth holographic film (32) is stacked with the first holographic film (11), the second holographic film (12), and the third holographic film (31) along the thickness direction (X), and the light source assembly (20) is used to provide light with a fourth preset wavelength to the fourth holographic film (32); The fourth holographic film (32) has a fourth microstructure (321), which is used to diffract light with the fourth preset wavelength toward the first field of view (40) or the second field of view (50) and generate a virtual image; The first preset wavelength, the second preset wavelength, the third preset wavelength, and the fourth preset wavelength are all different.

6. The imaging structure of the vehicle window according to claim 5, characterized in that, The first holographic film (11) is disposed facing the light source assembly (20), the second holographic film (12) is disposed on the side of the first holographic film (11) away from the light source assembly (20), the third holographic film (31) is disposed on the side of the second holographic film (12) away from the first holographic film (11), and the fourth holographic film (32) is disposed on the side of the third holographic film (31) away from the second holographic film (12).

7. The imaging structure of the vehicle window according to claim 5, characterized in that, The vehicle window glass (60) includes an outer glass layer (61) and an inner glass layer (62) arranged at intervals along the thickness direction (X), and a plurality of isolation films (63) disposed between the outer glass layer (61) and the inner glass layer (62) and arranged at intervals along the thickness direction (X). The first holographic film (11), the second holographic film (12), the third holographic film (31) and the fourth holographic film (32) are provided with the isolation film (63) on both sides along the thickness direction (X).

8. The imaging structure of the vehicle window according to claim 3, characterized in that, The light source assembly (20) includes: Multiple optical engines (21) are used to provide light of different wavelengths to the first membrane assembly (10) and the second membrane assembly (30), respectively.

9. A vehicle, characterized in that, The imaging structure of the vehicle window as described in any one of claims 1 to 8.

10. An imaging method for a vehicle window, characterized in that, An imaging structure applied to a vehicle window as described in any one of claims 1 to 8, or applied to a vehicle as described in claim 9, wherein the imaging method for the vehicle window comprises: The light source assembly (20) provides light with a first preset wavelength to the first holographic film (11) in the first film assembly (10) so that the first holographic film (11) generates a virtual image; The light source assembly (20) provides light with a second preset wavelength to the second holographic film (12) in the first film assembly (10) so that the second holographic film (12) produces a real image.

Images