Vehicle-mounted holographic display device and method and vehicle

Abstract

The invention discloses a vehicle-mounted holographic display device and method and a vehicle, and belongs to the technical field of optics. The vehicle-mounted holographic display device comprises a holographic module, a projection module and a control module; the holographic module is provided with a plurality of diffraction structure units, and at least two diffraction structure units are configured to diffract incident light to different positions; the projection module comprises a plurality of light outlets, and the at least two light outlets are configured to emit light beams with different incident angles to the at least two diffraction structure units respectively; the control module is in communication connection with the projection module, and the control module is configured to control opening and closing of the multiple light outlets. Switching of privacy and sharing modes is realized in the same area by controlling opening and closing of a light outlet, light is accurately projected to human eyes by utilizing a holographic module, energy is prevented from being scattered to a depopulated area, brightness in the eyes is improved, energy consumption is reduced, the contradiction between driving safety and parking entertainment is solved, the use frequency of projection entertainment is improved, and meanwhile, the driving safety is improved. And the driving safety during driving is ensured.

Description

Technical Field

[0001] This application relates to the field of optical technology, and in particular to an in-vehicle holographic display device, method and vehicle. Background Technology

[0002] With the development of automotive intelligence, in-vehicle display technology is also constantly advancing. Holographic projection glass technology, as an emerging display method, is being applied to areas such as windshields and side windows of automobiles. In holographic projection glass technology, the viewing angle, once set during the design phase, is usually unchangeable. If the viewing angle is too small, it cannot meet the needs of multiple people sharing a screen for watching audio-visual entertainment. If the viewing angle is too large, the projected content may affect the driver's driving safety and cause energy loss in the optical engine. Summary of the Invention

[0003] This application provides an in-vehicle holographic display device, method, and vehicle to at least partially solve the technical problem that holographic projection cannot simultaneously meet the needs of multiple people sharing a screen for audio-visual entertainment while reducing energy consumption.

[0004] To achieve the above objectives, according to a first aspect of this application, an in-vehicle holographic display device is provided, comprising:

[0005] A holographic module, wherein the holographic module is provided with multiple diffraction structure units, and at least two of the diffraction structure units are configured to diffract incident light to different positions; A projection module, comprising a light source and multiple light outlets, wherein at least two light outlets are configured to emit light beams at different incident angles to at least two of the diffraction structure units respectively; A control module is communicatively connected to the projection module and is configured to control the opening and closing of the plurality of light output ports.

[0006] In some embodiments, the in-vehicle holographic display device includes multiple eye boxes, which are configured to switch between a single eye box privacy mode and a multi-eye box sharing mode when the control module controls the opening and closing of the multiple light outlets.

[0007] In some embodiments, the control module is configured to control the projection module to switch to the single-eye box privacy mode when the vehicle is in motion, and to control the projection module to switch to the multi-eye box sharing mode when the vehicle is stationary.

[0008] In some embodiments, the control module is configured to control the projection module to switch to the single-eye box privacy mode or the multi-eye box sharing mode according to user instructions.

[0009] In some embodiments, the holographic module has a display area, and the display area has a plurality of diffraction structure units arranged in an array along a first direction and a second direction, wherein the first direction and the second direction intersect.

[0010] In some embodiments, two adjacent diffraction structure units are configured to diffract incident light to different eyebox locations, respectively.

[0011] In some embodiments, the display area is any one of the vehicle's front windshield, side window glass, or rear windshield.

[0012] In some embodiments, each of the diffraction structure units has different stripe structure parameters.

[0013] In some embodiments, the fringe structure parameters include the fringe height, fringe tilt angle, and fringe spacing of the diffraction structure unit.

[0014] According to a second aspect of this application, a holographic display method is provided, applied to the aforementioned vehicle-mounted holographic display device, the method comprising the following steps: The control module emits beams with different incident angles from at least two light output ports to at least two diffraction structure units. Control at least two of the diffraction structure units to diffract the incident light to different positions; Based on the operating mode, the opening and closing of the light output port is controlled.

[0015] According to a third aspect of this application, a vehicle is also provided, including the aforementioned in-vehicle holographic display device.

[0016] The vehicle-mounted holographic display device of this application embodiment includes a holographic module, a projection module, and a control module. The holographic module has multiple diffraction structure units, with at least two diffraction structure units configured to diffract incident light to different positions. The projection module includes a light source and multiple light exit ports, with at least two light exit ports configured to emit light beams at different incident angles to at least two diffraction structure units respectively. The control module is communicatively connected to the projection module and is configured to control the opening and closing of the multiple light exit ports. This configuration allows for switching between privacy and sharing modes within the same area by controlling the opening and closing of the light exit ports. The holographic module precisely projects light onto the human eye, avoiding energy scattering into unoccupied areas, increasing brightness and reducing energy consumption. This resolves the conflict between driving safety and parking entertainment, increasing the frequency of projection entertainment use while ensuring driving safety.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] 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.

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the structure of the in-vehicle holographic display device provided in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the structure of an in-vehicle holographic display device provided in another exemplary embodiment of this application; Figure 3 This is a schematic diagram of an in-vehicle holographic display device provided in an exemplary embodiment of this application; Figure 4 This is a flowchart illustrating the in-vehicle holographic display method provided in an exemplary embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Holographic module; 2. Projection module; 3. Control module; 4. Eye box; 10. Display area; 11. Diffraction structure unit; 20. Light source; 21. Light outlet; 40. First eye box; 41. Second eye box; 100. Vehicle-mounted holographic display device; X, first direction; Y, second direction. Detailed Implementation

[0022] 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.

[0023] The applicant noted that with the development of automotive intelligence, in-vehicle display technology is also constantly advancing. Holographic projection glass technology, as an emerging display method, is gradually being applied to automobiles. However, in holographic projection glass technology, the viewing angle, also known as the eyebox position, is usually unmodifiable once it is set in the design phase. In practical applications, this fixed viewing angle characteristic brings the following two problems: If the viewing angle is designed to be small, i.e., a privacy angle design, such as designing it to be visible only to the driver, although it is beneficial to protect privacy and prevent the passenger's entertainment information from interfering with the driver, ensuring driving safety, it cannot meet the needs of the driver and passenger to share the screen for watching audio-visual entertainment when the vehicle is stationary, such as when parked for rest or charging. Conversely, if it is designed to be an open, large viewing angle, i.e., a design without a privacy angle, although the driver and passenger can share the holographic image when not driving, when the vehicle is in motion, the content viewed by the passenger will be projected into the driver's field of vision, distracting the driver's attention and posing a serious safety hazard. In addition, simply expanding the eyebox range to cover the driver and passenger areas will cause huge losses of optical engine energy, and the unoccupied area between the driver and passenger also wastes effective display space.

[0024] In view of this, this application provides an in-vehicle holographic display device, including a holographic module, a projection module, and a control module. The holographic module has multiple diffraction structure units, at least two of which are configured to diffract incident light to different positions. The projection module includes a light source and multiple light exit ports, at least two of which are configured to emit light beams with different incident angles to at least two diffraction structure units. The control module is communicatively connected to the projection module and is configured to control the opening and closing of the multiple light exit ports. This configuration allows for switching between privacy and sharing modes within the same area by controlling the opening and closing of the light exit ports. The holographic module precisely projects light onto the human eye, avoiding energy scattering into unoccupied areas, increasing brightness and reducing energy consumption. This resolves the conflict between driving safety and parking entertainment, increasing the frequency of projection entertainment while ensuring driving safety.

[0025] The in-vehicle holographic display device, method, and vehicle of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0026] This application provides an in-vehicle holographic display device 100. Please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of an in-vehicle holographic display device 100 provided in an exemplary embodiment of this application.

[0027] This application provides an in-vehicle holographic display device 100, including a holographic module 1, a projection module 2, and a control module 3. The holographic module 1 is the display carrier of this device. In this application embodiment, the holographic module 1 can be integrated into a transparent component of the vehicle, such as any one of the vehicle's windshield, side windows, or rear windshield. In this application embodiment, the application of the holographic module 1 to the windshield is used as an example for explanation.

[0028] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the vehicle-mounted holographic display device 100 provided in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the structure of an in-vehicle holographic display device 100 provided in another exemplary embodiment of this application. The holographic module 1 has multiple diffraction structure units 11, which are the basic physical units for holographic image imaging. At least two of the multiple diffraction structure units 11 are configured to diffract incident light to different positions. The projection module 2 includes a light source 20 and multiple light exit ports 21. At least two light exit ports 21 are configured to emit light beams with different incident angles to at least two diffraction structure units 11 respectively. The control module 3 is communicatively connected to the projection module 2 and is configured to control the opening and closing of the multiple light exit ports 21. With this configuration, by controlling the opening and closing of the light exit ports 21, privacy and sharing modes can be switched in the same area. The holographic module 1 accurately projects light onto the human eye, avoiding energy scattering into uninhabited areas, increasing the brightness of light entering the eye and reducing energy consumption. This resolves the conflict between driving safety and parking entertainment, increasing the frequency of projection entertainment while ensuring driving safety.

[0029] In some embodiments, please refer to Figure 2 The holographic module 1 has a display area 10, and multiple diffraction structure units 11 are arranged in an array along a first direction X and a second direction Y, where the first direction X and the second direction Y intersect. The holographic module 1 has a microstructure design; specifically, the display area 10 of the holographic module 1 has multiple diffraction structure units 11 arranged in an array along the first direction X and the second direction Y, where the first direction X and the second direction Y are perpendicular.

[0030] In some embodiments, the hologram is designed and manufactured using a point exposure method, with each point designed and exposed on a unit of tiny area. Each point constitutes a diffraction structure unit 11.

[0031] In some embodiments, please refer to Figure 2Two adjacent diffraction structure units 11 are configured to diffract the incident light to different positions of the eye box 4, respectively. It is understood that, to ensure display uniformity, the two adjacent diffraction structure units 11 are configured to diffract the incident light to different positions of the eye box 4, respectively. Specifically, the diffraction structure unit 11 pointing to the first eye box 40 is designated as the first diffraction unit, and the diffraction structure unit 11 pointing to the second eye box 41 is designated as the second diffraction unit.

[0032] In some embodiments, please refer to Figure 2 In the display area 10, the first and second diffraction units are arranged alternately. Specifically, the arrangement of the first and second diffraction units can be staggered between rows or columns. For example, the first row can be a sequence of first diffraction unit, second diffraction unit, first diffraction unit, second diffraction unit, and so on. The second row can be a sequence of second diffraction unit, first diffraction unit, second diffraction unit, first diffraction unit, and so on. Adjacent diffraction structure units 11 diffract towards the eye boxes 4 of the driver and co-driver, respectively. This compact staggered distribution ensures that the images from both viewing angles are continuous and uniform, avoiding a decrease in imaging resolution or graininess at a particular viewing angle. In this embodiment, the size of each diffraction structure unit 11 can be a square or other shape with a side length of approximately 250 μm. Through this micrometer-level pixelation, the human eye cannot perceive the missing pixels at normal viewing distances, thus enabling the viewing of a complete and clear image.

[0033] In some embodiments, the projection module 2 may use a common image generation source and light source 20, and the projection module 2 is designed with different optical path systems at the light exit port 21. Specifically, the projection module 2 includes a first light exit port B1 and a second light exit port B2. The first light exit port B1 is configured to project a first light beam, which illuminates the display area 10 of the holographic module 1 at a first incident angle range. This first incident angle matches the Bragg angle of the first diffraction unit on the holographic module 1. The second light exit port B2 is configured to project a second light beam, which illuminates the display area 10 of the holographic module 1 at a second incident angle range. This second incident angle matches the Bragg angle of the second diffraction unit on the holographic module 1. Specifically, the first incident angle may be 10° and the second incident angle may be 20°, and this application does not limit this.

[0034] In some embodiments, the vehicle-mounted holographic display device 100 can share a single light source 20 in different operating modes without differentiating wavelengths. For example, the light source 20 can use red (625nm), green (525nm), and blue (465nm) LEDs of specific wavelengths. The diffraction structure unit 11 on the holographic module 1 only responds to light of these specific wavelengths and at specific angles. Ambient light of other wavelengths will pass through the glass normally, ensuring the transparency of the glass.

[0035] In some embodiments, please refer to Figure 1 The vehicle-mounted holographic display device 100 includes multiple eye boxes 4. These eye boxes 4 are configured to switch between a single-eye box privacy mode and a multi-eye box sharing mode when the control module 3 controls the opening and closing of multiple light-emitting ports 21. The vehicle-mounted holographic display device 100 can switch between multiple operating modes. For example, a first eye box 40 covering the driver's eye area and a second eye box 41 covering the passenger's eye area. The multiple eye boxes 4 are configured to switch between a single-eye box privacy mode and a multi-eye box sharing mode when the control module 3 controls the opening and closing of the multiple light-emitting ports 21.

[0036] In some embodiments, the control module 3 is configured to control the projection module 2 to switch to the privacy mode of the single-eye box 4 when the vehicle is in motion. The application scenario for the privacy mode of the single-eye box 4 is when the vehicle is in motion. In this case, to prevent entertainment content viewed by the passenger from interfering with the driver's view and to ensure driving safety, it is necessary to block the display content on the driver's side. The control module 3 closes the first light outlet B1 of the projection module 2 pointing to the driver's viewpoint and only opens the second light outlet B2 pointing to the passenger's viewpoint. The user can see the projected content on the glass from the passenger position; while when the driver looks at the same glass area from the driver's position, he sees transparent glass without image interference, which can improve driving safety.

[0037] In some embodiments, when the vehicle is stationary, the control projection module 2 switches to the multi-viewer 4 sharing mode. The multi-viewer 4 sharing mode can be used when the vehicle is stationary. In this scenario, the driver no longer needs to focus on road conditions, and both the driver and passenger need to share the screen to watch audio-visual entertainment. When the control module 3 receives a signal that the vehicle is stationary, it controls the projection module 2 to switch to the multi-viewer 4 sharing mode. Specifically, the control module 3 simultaneously opens the first light output port B1 and the second light output port B2 of the projection module 2. The projection module 2 simultaneously emits a beam of light at a first incident angle and a beam of light at a second incident angle. The beam of light at the first incident angle hits the first diffraction unit and diffracts to the first viewer 40; the beam of light at the second incident angle hits the second diffraction unit and diffracts to the second viewer 41. This allows multiple users to see the same content on the same display area 10, enhancing the user's entertainment experience.

[0038] In some embodiments, the control module 3 is configured to control the projection module 2 to switch between single-viewer 4 privacy mode and multi-viewer 4 sharing mode according to user instructions. For example, when the device is parked, the user can manually select or activate the single-viewer 4 privacy mode or multi-viewer 4 sharing mode via voice or other means.

[0039] In some embodiments, each diffraction structure element 11 has different fringe structure parameters. Specifically, the fringe structure parameters include the fringe height, fringe tilt angle, and fringe spacing of the diffraction structure element 11. Each diffraction structure element 11 is essentially a holographic optical element (HOE). To achieve selective diffraction of incident light at a specific angle, each diffraction structure element 11 has different fringe structure parameters. These fringe structure parameters mainly include the fringe height, fringe tilt angle, and fringe spacing of the diffraction structure element 11. The fringe tilt angle determines the relationship between the incident angle and the diffraction angle in the grating equation. For example, the fringe tilt angle of the first diffraction element is designed such that when light enters at a first incident angle, the Bragg diffraction condition is satisfied, and the light is efficiently diffracted towards the driver's position; while when light enters at a second incident angle, because the Bragg condition is not satisfied, the light will pass directly through or diffract with extremely low efficiency, so the image cannot be seen at the driver's position. Similarly, the fringe tilt angle of the second diffraction element is designed to produce effective diffraction towards the passenger position only for light at a second incident angle. The fringe spacing determines the dispersion characteristics and deflection angle of the diffracted light. According to the grating equation, the fringe spacing, combined with the wavelength of the incident light, precisely controls the direction of the outgoing light. The fringe height affects the diffraction efficiency and angular bandwidth. By adjusting the fringe height and spacing, it is ensured that the target wavelength light is efficiently diffracted to the effective eye box 4, avoiding stray light interference. Through the differentiated design of the above fringe structure parameters, uniform fusion of multi-view images within the same display area 10 is achieved, ensuring continuous, high-definition, and transparent images from each viewpoint.

[0040] Please see Figure 4 , Figure 4 This is a flowchart illustrating an exemplary embodiment of the vehicle-mounted holographic display method provided in this application. According to a second aspect of this application, a holographic display method is provided, applied to the aforementioned vehicle-mounted holographic display device 100, the method comprising the following steps: Step S1: Control at least two light outlets 21 of the projection module 2 to emit light beams with different incident angles to at least two diffraction structure units 11 respectively.

[0041] Step S2: Control at least two diffraction structure units 11 to diffract the incident light to different positions.

[0042] Step S3: Based on the working mode, control the opening and closing of the light output port 21.

[0043] In some embodiments, the in-vehicle holographic display device 100 includes multiple eye boxes 4. These eye boxes 4 are configured to switch between a single-eye box privacy mode and a multi-eye box sharing mode when the control module 3 controls the opening and closing of multiple light-emitting ports 21. The in-vehicle holographic display device 100 can switch between multiple operating modes. The in-vehicle holographic display includes multiple eye boxes 4, such as a first eye box 40 covering the driver's eye area and a second eye box 41 covering the passenger's eye area. The multiple eye boxes 4 are configured to switch between a single-eye box privacy mode and a multi-eye box sharing mode when the control module 3 controls the opening and closing of multiple light-emitting ports 21. By controlling the opening and closing of the light-emitting ports 21, the privacy and sharing modes can be switched within the same area. The holographic module 1 accurately projects light onto the human eye, avoiding energy scattering into unoccupied areas, increasing the brightness of light entering the eye, and reducing energy consumption. This resolves the conflict between driving safety and parking entertainment, increasing the frequency of projection entertainment while ensuring driving safety.

[0044] According to a third aspect of this application, a vehicle is also provided, including the above-described vehicle-mounted holographic display device 100, which has all the beneficial effects of the above-described vehicle-mounted holographic display device 100, which will not be repeated here.

[0045] In some embodiments, the vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not specifically limit it.

[0046] 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.

[0047] 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.

[0048] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0049] 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. A vehicle-mounted holographic display device, characterized in that, include: The holographic module is provided with multiple diffraction structure units, and at least two of the diffraction structure units are configured to diffract incident light to different positions. The projection module includes a light source and multiple light outlets, at least two of which are configured to emit light beams at different incident angles to at least two of the diffraction structure units. A control module is communicatively connected to the projection module, and the control module is configured to control the opening and closing of the plurality of light output ports.

2. The vehicle-mounted holographic display device according to claim 1, characterized in that, The in-vehicle holographic display device includes multiple eye boxes, which are configured to switch between a single eye box privacy mode and a multi-eye box sharing mode when the control module controls the opening and closing of the multiple light outlets.

3. The vehicle-mounted holographic display device according to claim 2, characterized in that, The control module is configured to switch the projection module to the single-eye box privacy mode when the vehicle is in motion, and to switch the projection module to the multi-eye box sharing mode when the vehicle is stationary. or, The control module is configured to control the projection module to switch to the single-eye box privacy mode or the multi-eye box sharing mode according to user instructions.

4. The vehicle-mounted holographic display device according to claim 2, characterized in that, The holographic module has a display area, and multiple diffraction structure units are arranged in an array along a first direction and a second direction, wherein the first direction and the second direction intersect.

5. The vehicle-mounted holographic display device according to claim 4, characterized in that, The two adjacent diffraction structure units are configured to diffract the incident light to different eyebox positions, respectively.

6. The vehicle-mounted holographic display device according to claim 4, characterized in that, The display area is any one of the vehicle's front windshield, side windows, or rear windshield.

7. The vehicle-mounted holographic display device according to claim 1, characterized in that, Each of the diffraction structure units has different fringe structure parameters.

8. The vehicle-mounted holographic display device according to claim 7, characterized in that, The fringe structure parameters include the fringe height, fringe tilt angle, and fringe spacing of the diffraction structure unit.

9. A holographic display method, applied to an in-vehicle holographic display device as described in any one of claims 1 to 8, characterized in that, The method includes the following steps: The control module emits beams with different incident angles from at least two light output ports to at least two diffraction structure units. Control at least two of the diffraction structure units to diffract the incident light to different positions; Based on the operating mode, the opening and closing of the light output port is controlled.

10. A vehicle, characterized in that, Including the vehicle-mounted holographic display device as described in any one of claims 1 to 8.

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