Display device, vehicle, and vehicle control method

Abstract

A display device (100), a vehicle (200), and a method for controlling the vehicle (200) are disclosed, in which the display device (100) includes a beam generator (10) and a holographic light guide (20), the beam generator (10) includes a display (11) and generates a beam having image information to be displayed by the display (11), the size of the display (11) is a first predetermined size, and the holographic light guide (20) displays an image of a second predetermined size at a position separated by a first predetermined distance backward from the display device (100) based on the beam having image information, the second predetermined size being a predetermined multiple of the first predetermined size, and the predetermined multiple being greater than 1. In this way, the display device (100) can realize an experience similar to watching a TV drama at home without requiring the pupils of the eyes to be in an uncomfortable state of being widely opened for a long period of time, without causing fatigue and myopia, and can increase the size of the image while not occupying physical space in the vehicle.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This disclosure claims priority to a Chinese patent application with application number 202111656373.0, entitled "Display Device, Vehicle, and Vehicle Control Method," filed on December 30, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of vehicles, and more particularly to a display device, a vehicle, and a vehicle control method. [Background technology]

[0003] At present, some high-end vehicles are equipped with displays behind the front seats, which are mainly used to play videos for passengers in the rear seats to easily watch, improving the grade of the vehicle and the entertainment of the passengers in the rear seats. In addition, high-end vehicles with more complete functions are equipped with functions such as communication, office work, Internet connection, and external game consoles. In the related technology, rear displays are not uniformly arranged, for example, behind the headrests of the front seats (as shown in FIG. 1), behind the seat backs of the front seats, behind the center armrest, and on the rear roof. The optimal position for watching videos is behind the headrests of the front seats and behind the seat backs of the front seats, and the image displayed by the rear display is about 12 inches. However, in the related technology, the observation distance from the human eye to the display is only about 650 mm, which is too short, and the human eye is prone to visual fatigue and myopia when constantly looking at a small screen, and is especially prone to shaking, dizziness, and discomfort while driving. Summary of the Invention

[0004] The display device, vehicle, and vehicle control method eliminate the need to keep the pupils of the glasses in an uncomfortable wide-open state for long periods of time, without causing fatigue and myopia, provide an experience similar to watching a TV drama at home, and increase the size of the image without occupying physical space in the vehicle.

[0005] In a first aspect, a display device according to the present disclosure includes a beam generator and a holographic optical waveguide, the beam generator including a display and generating a beam having image information to be displayed by the display, the size of the display being a first predetermined size, the holographic optical waveguide displaying an image of a second predetermined size at a position a first predetermined distance rearward from the display device based on the beam having the image information, the second predetermined size being a predetermined multiple of the first predetermined size, and the predetermined multiple being greater than one.

[0006] A display device according to an embodiment of the present disclosure increases the size of the image by displaying an image of a second predetermined size, and does not occupy physical space in the vehicle; by displaying the image at a first predetermined distance rearward from the display device, the overall experience resembles that of watching a television drama at home, without the need to have the pupils of the glasses in an uncomfortable wide dilated state for an extended period of time.

[0007] In a second aspect, a vehicle according to the present disclosure includes the display device.

[0008] The display device is provided at the headrest position or the back position of the front seat of the vehicle.

[0009] In a vehicle according to an embodiment of the present disclosure, the display device can provide an experience similar to watching a television drama at home without the need to keep the pupils of the glasses in an uncomfortable wide dilated state for a long period of time, which can cause fatigue and myopia, and can increase the size of the image while not taking up physical space in the vehicle.

[0010] In a third aspect, in a vehicle control method according to the present disclosure, the vehicle includes a front seat, a rear seat, and the display device, the display device being provided at the headrest position or the back position of the front seat, and the method includes determining that the display device is in an operating state, obtaining a relative position between the display device and the eyes of a passenger in the rear seat, and adjusting a position of at least one of the front seat and the rear seat if the relative position does not satisfy a predetermined condition.

[0011] According to the vehicle control method of the embodiment of the present disclosure, by adjusting the holographic optical waveguide by a motor, the relative position between the display device and the eyes of the rear seat passengers can be maintained, eliminating the need to keep the pupils of the glasses in an uncomfortable wide open state for a long period of time, and thus preventing fatigue and myopia, providing an experience similar to that of watching a TV drama at home, while increasing the size of the image and not occupying physical space in the vehicle.

[0012] Additional aspects and advantages of the disclosure will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the disclosure. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing a related art display disposed behind a headrest of a front seat. [Diagram 2] FIG. 1 is a schematic configuration diagram of a display device according to an embodiment of the present disclosure. [Diagram 3] 3 is a schematic diagram showing the size of an image displayed by a display device according to an embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram of a beam generator according to an embodiment of the present disclosure. [Diagram 5] FIG. 1 is a schematic diagram of a holographic optical waveguide according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is a schematic diagram of a light beam in a holographic optical waveguide according to one embodiment of the present disclosure. [Figure 7]FIG. 2 is a schematic diagram of the optical information of the object beam and the reference beam recorded on a holographic plate according to one embodiment of the present disclosure. [Figure 8] FIG. 2 is a schematic diagram of the distances from the object beam, reference beam to the holographic plate in one embodiment of the present disclosure. [Figure 9] FIG. 2 is a schematic diagram of a reconstructed light beam from a holographic plate according to one embodiment of the present disclosure. [Figure 10] 1 is a schematic configuration diagram of a vehicle according to an embodiment of the present disclosure. [Figure 11] 1 is a schematic diagram showing a display device according to an embodiment of the present disclosure provided at the headrest position of a front seat; [Figure 12] 1 is a schematic diagram showing a display device according to an embodiment of the present disclosure provided at the back of a front seat; [Figure 13] FIG. 2 is a schematic configuration diagram of a vehicle according to another embodiment of the present disclosure. [Figure 14] 4 is a flowchart of a vehicle control method according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the embodiments of the present disclosure will be described in detail, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals throughout represent the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are intended to interpret the present disclosure, and should not be understood as limiting the present disclosure.

[0015] Hereinafter, a display device, a vehicle, and a vehicle control method according to an embodiment of the present disclosure will be described with reference to FIGS.

[0016] 2 is a schematic diagram of a display device according to an embodiment of the present disclosure. As shown in FIG. 2, the display device 100 includes a beam generator 10 and a holographic optical waveguide 20, the beam generator 10 includes a display 11, and generates a beam having image information to be displayed by the display 11, the size of the display 11 is a first predetermined size, the holographic optical waveguide 20 displays an image of a second predetermined size at a position separated from the display device 100 by a first predetermined distance based on the beam having image information, the second predetermined size is a predetermined multiple of the first predetermined size, and the predetermined multiple is greater than 1. The value of the predetermined multiple is 4 to 6, and the value of the first predetermined distance is 2500 to 3500 mm.

[0017] Specifically, in the related art, the seat display directly uses a liquid crystal display (for example, 12 inches), the display size is the size of the display (12 inches), and the human eyes directly view the display.

[0018] As shown in Fig. 3, in the present disclosure, the holographic optical waveguide 20 allows a human eye E to see an image R1 of a second predetermined size (e.g., 50 inches) at a position a first predetermined distance behind the display device 100 based on a beam having image information generated by the beam generator 10 and displayed by the display 11 (the size of the display 11, i.e., the first predetermined size is, for example, 12 inches). Thus, by displaying an image of the second predetermined size, the size of the image is increased and does not occupy physical space in the vehicle, and by displaying an image at a position a first predetermined distance behind the display device 100, the overall experience is similar to the feeling of watching a TV drama at home, and there is no need to keep the pupils of the glasses in an uncomfortable wide open state for a long period of time.

[0019] As an example, the beam generator 10 may further include a light source 12, a condenser plate 13, a diffuser plate 14 and a collimator lens 15 arranged in that order, and the display 11 is arranged between the diffuser plate 14 and the collimator lens 15.

[0020] Specifically, in the conventional means, the LED is irradiated to a 12-inch liquid crystal display by a light guide plate, and the human eye directly sees the display. As shown in FIG. 4, in the present disclosure, the light source 12 is condensed by a light condensing plate 13, uniformly diffused by a diffusion plate 14, and irradiated to a small-sized display 11 (for example, 5 inches), and the beam having image information displayed by the display 11 is obtained by a collimator lens 15. The light source 12 may include a light-emitting diode LED light source, a laser light source, or a micro light-emitting diode micro LED light source, the light condensing plate 13 may include a condensing lens or a reflector, and the display 11 is small and does not display in appearance. The display 11 may include a thin film transistor TFT display, a digital micromirror element DLP display, or a liquid crystal on silicon LCOS display, or an organic light-emitting diode OLED display, and an organic light-emitting diode OLED display can be further used when reducing the volume of the beam generator 10 and improving the color display.

[0021] As an example, the holographic optical waveguide 20 may include an optical waveguide in-coupling structure 21 and an optical waveguide out-coupling structure 22, in which the optical waveguide in-coupling structure in-couples a beam having image information and propagates the beam having image information to the optical waveguide out-coupling structure 22, and the optical waveguide out-coupling structure 22 out-couples the beam having image information to display an image of a second predetermined size at a position separated by a first predetermined distance backward from the display device 100. The beam having image information is a parallel beam, the beam generator 10 is provided directly opposite the optical waveguide in-coupling structure 21, and the optical waveguide in-coupling structure 21 and the optical waveguide out-coupling structure 22 are provided in the same plane.

[0022] 5 and 6, a beam having image information to be displayed by display 11, generated by beam generator 10, enters optical waveguide internal coupling structure 21 that uses a holographic diffraction grating as a beam, passes through optical waveguide external coupling structure 22 that uses a holographic diffraction grating as a beam, and finally forms an image of a second predetermined size at a position a first predetermined distance behind display device 100. From the first predetermined size (e.g., 12 inches), which is the size of display 11, an enlarged display of an image of a second predetermined size (e.g., 50 inches) is realized by the recording and imaging principle using the holographic diffraction grating, and the image of the second predetermined size is seen by human eye E.

[0023] In addition, the role of the optical waveguide is that the optical information propagates within the waveguide, propagating from one end of the waveguide to the other end, but does not exit the interface. By realizing a holographic diffraction grating through interference generation and diffraction reconstruction, and then attaching the holographic diffraction grating to the surface of the optical waveguide, the original total reflection interface rule is broken, so that the direction and energy of the optical information propagation are changed, and the optical information is transmitted from the inside of the waveguide to the outside and enters the human eye.

[0024] Specifically, the optical waveguide outcoupling structure 22 includes a holographic plate 221, and the optical information of the object light and the reference light is recorded in advance on the holographic plate 221. The distance from the object light and the reference light to the holographic plate 221, the predetermined multiple, and the first predetermined distance satisfy the following formula:

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[0025] The recording and imaging principles of the holographic dry plate 221 will now be described with reference to FIGS.

[0026] 7, the beam splitter S1 splits the laser light from the laser L into two to generate coherent interference light. The reflecting mirrors S2-S3 fold the optical path, the beam expanders S4-S5 diffuse the focused laser light into a large-area light source to illuminate all of the object A, the magnifying lens S6 magnifies the object A to form an image of a second predetermined size, and forms the image at a position a first predetermined distance behind the display device 100. The optical information of the object light O and the reference light R is recorded on the holographic dry plate 221.

[0027] As shown in Fig. 8, the position where an image of an object A is formed by a magnifying lens S6 is the position of the object light O, and the position of the beam expander S4 is the position of the reference light R. Both the object light O and the reference light R are coherent lights, and the equations of the object light O(x,y) and the reference light R(x,y) are as shown in equations (1) and (2),

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[0028] The amplitude of the interference field is the coherent superposition of the two, as shown in equation (3), U(x,y)=O(x,y)+R(x,y) (3) The amount of exposure light recorded on the holographic plate 221 is given by equation (4): I(x,y)=U(x,y)*U* (x,y)=|O| 2 +|R| 2 +O*R * +O * *R (4) Here, U * (x,y) is the conjugate of U(x,y), and R * is the conjugate of R, and O * is the conjugate of O.

[0029] 9, the reconstructed light C emitted from the collimator lens 15 in the beam generator 10 is irradiated onto a holographic dry plate 221 that freezes the above information. The equation C(x, y) of the reconstructed light C is as shown in equation (5), and the equation U'(x, y) of the light transmitted through the holographic dry plate 221 from the reconstructed light C is as shown in equation (6).

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[0030]

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[0031] In addition, in the present disclosure, the optical information magnified by a reflector or lens is pre-recorded on the holographic dry plate 221 using a photosensitive material, and no lens or reflector is required for the playback process; that is, the recording and imaging process of the holographic dry plate 221 in Figures 7 to 8 is completed before the display device 100 begins to operate, so that the holographic optical waveguide 20 performs optical path recording with a thickness of only 1.5 to 2.5 mm, thereby reducing the imaging space occupied by the reflector or lens.

[0032] As shown in Figures 8 and 9, o , l c , l r are the distances from the object beam O, the reconstruction beam C, and the reference beam R to the holographic plate 221, respectively. i is a first predetermined distance that the image is rearwardly away from the display device 100.

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[0033] The physical relationship of a general lens is as shown in formulas (12) and (13).

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[0034] The magnification factor M is as shown in equation (14).

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[0035] In the present disclosure, the beam generator 10 may include a collimator lens 15 at the end so that the reconstructed light C is parallel and has a distance of infinity. c When is ∞, equation (14) becomes

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[0036] In addition, the above principle may be used for designing according to other design requirements. For example, in order to realize the requirement that the imaging distance (i.e., the first predetermined distance) is 3 meters and the image is enlarged from 5 inches to 50 inches (i.e., the enlargement factor M=10), the wavelengths of the reconstruction light C and the reference light R are the same, i.e., i = 3000 mm, and l c When is ∞, we obtain f' = 3000 mm based on equations (12) and (13), and l r =1.11*l o Based on o =297.3mm, l r = 330 mm. Also, different systems can achieve different magnifications and imaging at different distances, which is related to the design goal, but the principle method is the same.

[0037] As described above, the display device 100 can increase the imaging distance, does not require the pupils of the glasses to be in an uncomfortable state wide open for a long period of time, does not cause fatigue and myopia, and realizes an experience similar to watching a TV drama at home. In addition, since the formed image is a virtual image, it does not need to be received on a receiving screen, and the image can be viewed directly at a corresponding position in the air, which increases the size of the image and does not occupy the physical space of the vehicle, solving the problem that a large-sized display cannot be placed in the physical space, and even if there is one seat in the physical space, it does not block the imaging image or reduce the imaging brightness.

[0038] Fig. 10 is a schematic diagram of a vehicle according to an embodiment of the present disclosure. As shown in Fig. 10, the vehicle 200 includes the display device 100. Specifically, as shown in Figs. 11 and 12, the display device 100 is provided at position H of the headrest or position B of the back of the front seat of the vehicle 200, and the optimal placement position is confirmed mainly by a man-machine check of the entire vehicle, a visual check of the human eye E, and a comfort check.

[0039] As described above, the display device 100 enables the vehicle 200 to realize an experience similar to that of watching a TV drama at home without the need to keep the pupils of the glasses in an uncomfortable wide open state for a long period of time, thereby avoiding fatigue and myopia, and also increasing the size of the image while not occupying physical space in the vehicle.

[0040] Fig. 14 is a flowchart of a vehicle control method according to an embodiment of the present disclosure. As shown in Fig. 13, vehicle 200 includes front seat 210, rear seat 220, and display device 100, which is provided at the headrest position or the back position of front seat 210. As shown in Fig. 14, the vehicle control method includes the following steps S101 to S103.

[0041] In S101, it is determined that the display device 100 is in an operating state.

[0042] In S102, the relative position between the display device 100 and the eyes of the passenger in the rear seat 220 is acquired.

[0043] In S103, if the relative position does not satisfy a predetermined condition, the position of at least one of the front seat 210 and the rear seat 220 is adjusted.

[0044] Specifically, since the seat has a certain adjustment range of angle and vertical position, and the imaging position is a fixed field of view, the relative position needs to be maintained by adjusting the holographic optical waveguide 20 with a motor.

[0045] For other specific embodiments of the vehicle control method according to the embodiment of the present disclosure, reference may be made to the specific embodiments of the display device 100 according to the embodiment of the present disclosure.

[0046] As described above, the vehicle control method does not require the pupils of the glasses to be kept in an uncomfortable wide open state for a long period of time, does not cause fatigue and myopia, provides an experience similar to watching a TV drama at home, increases the size of the image, and does not occupy physical space in the vehicle.

[0047] It should be noted that the logic and / or steps shown in the flow charts or otherwise described in this disclosure may be considered, for example, as an ordered list of executable instructions for implementing logical functions, and may be tangibly embodied in any computer-readable medium for use by or in combination with an instruction execution system, device, or apparatus (e.g., a computer-based system, a system including a processor, or other system capable of reading and executing instructions from an instruction execution system, device, or apparatus). As used herein, a "computer-readable medium" may be any device capable of storing, storing, communicating, propagating, or transmitting a program for use by or in combination with an instruction execution system, device, or apparatus. More specific examples (non-exhaustive list) of computer-readable storage media include an electrical connection having one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable read-only memory (CD-ROM). The computer-readable storage medium may also be paper or other suitable medium upon which the program may be printed so that the program may be obtained electronically and thereafter stored in computer memory, for example by optically scanning the paper or other medium and then editing, interpreting or processing in any other suitable manner as required.

[0048] It should be understood that each part of the present disclosure can be realized by hardware, software, firmware, or a combination thereof. In the above embodiment, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, when realized by hardware, as in another embodiment, it can be realized by any one or combination of known techniques in the art, such as a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having a suitable combinational logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0049] In the present specification, a description that refers to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, exemplary expressions of the above terms are not necessarily limited to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described can be appropriately combined in any one or more embodiments or examples.

[0050] In addition, in the description of the present disclosure, the orientations or positional relationships indicated by the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to easily explain and simplify the present disclosure, and do not indicate or imply that the depicted devices or parts must have a specific orientation, be configured, or be operated in a specific orientation, and therefore should not be understood as limiting the present disclosure.

[0051] Additionally, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or suggest the relative importance or quantity of the technical features depicted. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of this disclosure, "plurality" means at least two, e.g., two, three, etc., unless otherwise clearly and specifically limited.

[0052] In the present disclosure, unless otherwise specified and limited, the terms "attached", "coupled", "connected", "fixed", etc. should be understood in a broad sense, and unless otherwise specified, may be, for example, a fixed connection, a detachable connection, or an integral connection, may be a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or a relationship of internal communication between two elements or an interaction between two elements. A person skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific situation.

[0053] In this disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first feature and the second feature are in direct contact with each other, or that the first feature and the second feature are in indirect contact with each other via an intermediate medium. Furthermore, a first feature being "above," "above" or "on the upper surface" of a second feature may include that the first feature is directly above and diagonally above the second feature, or may simply mean that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below" or "on the lower surface" of a second feature may include that the first feature is directly below and diagonally below the second feature, or may simply mean that the horizontal height of the first feature is lower than that of the second feature.

[0054] Although the embodiments of the present disclosure have been shown and described above, the above embodiments are illustrative and should not be understood as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

Claims

1. a beam generator and a holographic optical waveguide; the beam generator includes a display and generates a beam having image information to be displayed by the display, the size of the display being a first predetermined size; the holographic optical waveguide displays an image of a second predetermined size at a position spaced a first predetermined distance rearward from the display device based on the beam having the image information; the second predetermined size being a predetermined multiple of the first predetermined size; The predetermined multiple is greater than 1. Display device.

2. The holographic optical waveguide includes an optical waveguide internal coupling structure and an optical waveguide external coupling structure; the optical waveguide in-coupling structure in-coupling a beam having image information therein and propagating the beam having image information to the optical waveguide out-coupling structure; the optical waveguide outcoupling structure outcoupling a beam having the image information so as to display an image of the second predetermined size at a position spaced from the display device by the first predetermined distance backward. The display device according to claim 1 .

3. the beam generator is provided directly opposite the optical waveguide internal coupling structure; The optical waveguide internal coupling structure and the optical waveguide external coupling structure are provided in the same plane. The display device according to claim 2 .

4. the image information-bearing beam is a collimated beam; the optical waveguide outcoupling structure includes a holographic plate; The holographic plate has optical information of an object beam and a reference beam recorded thereon in advance, the distance from the object beam and the reference beam to the holographic plate, the predetermined multiple, and the first predetermined distance satisfy the following formulas: [0010] [0025] where M is the predetermined multiple, and l ｏ , l ｒ are the distances from the object beam and the reference beam to the holographic plate, respectively, and l ｉ is the first predetermined distance, The display device according to claim 2 or 3.

5. The beam generator further includes a light source, a condenser plate, a diffuser plate, and a collimator lens, which are arranged in this order; The display is provided between the diffusion plate and the collimator lens. The display device according to claim 1 .

6. The light source includes a light emitting diode (LED) light source, a laser light source, or a micro light emitting diode (micro LED) light source; The light collecting plate includes a collecting lens or a reflecting mirror, The display comprises a thin film transistor TFT display, a digital micromirror element DLP display, a liquid crystal on silicon LCOS display or an organic light emitting diode OLED display. The display device according to claim 5 .

7. the predetermined multiple is a value between 4 and 6; the value of the first predetermined distance is between 2500 and 3500 mm; The thickness of the holographic optical waveguide is 1.5 to 2.5 mm. The display device according to claim 1 .

8. A display device according to any one of claims 1 to 7, vehicle.

9. The display device is provided at a headrest position or a back position of a front seat of the vehicle.

9. The vehicle of claim 8.

10. A method for controlling a vehicle, comprising: The vehicle includes a front seat, a rear seat, and the display device according to any one of claims 1 to 7, The display device is provided at a headrest position or a back position of the front seat, The method comprises: determining that the display device is in an operational state; obtaining a relative position between the display device and the eyes of the rear seat passenger; adjusting a position of at least one of the front seat and the rear seat when the relative position does not satisfy a predetermined condition; Characterized in that it comprises method.

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