Optical systems, HUD devices and vehicles for naked-eye 3D imaging

Abstract

The present invention provides an optical system for naked-eye 3D imaging, which belongs to the naked-eye 3D technology, and includes: an image source device, a spectroscopic unit and a reflection component; the image source device is used to emit a first polarized light and a second polarized light; the spectroscopic unit is used to reflect the first polarized light to form a first imaging light; after the second polarized light passes through the spectroscopic unit and is reflected multiple times in the multiple reflectors, it passes through the spectroscopic unit again to emit to form a second imaging light, so that the optical path of the second imaging light is greater than the optical path of the first imaging light, so that the first imaging light and the second imaging light form an optical depth of field imaging, thereby achieving the naked-eye 3D effect.

Description

Technical Field

[0001] The present invention relates to naked-eye 3D technology, and in particular to an optical system, HUD equipment and vehicle for naked-eye 3D imaging. Background Art

[0002] Naked-eye 3D, also known as Autostereoscopy, is a technology that can achieve a three-dimensional visual effect without the aid of external tools such as polarized glasses. Naked-eye 3D technology mainly uses the structure of the screen itself and special display technology to make the left and right eyes only see specific pixels on the screen, thus producing a realistic three-dimensional image effect.

[0003] The currently popular naked-eye 3D technology is the cylindrical prism naked-eye 3D technology. The cylindrical lens technology is also called micro-cylindrical lens 3D technology. The three-dimensional display based on the binocular parallax principle (i.e., split-beam stereo display), especially the naked-eye split-beam stereo display technology, has begun to be applied to HUD. How to achieve naked-eye 3D imaging is an urgent problem to be solved in this field. Summary of the invention

[0004] Based on the above situation, the main purpose of the present invention is to provide an optical system, a HUD device and a vehicle for naked-eye 3D imaging.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present application provides an optical system for naked-eye 3D imaging, comprising:

[0007] Image source device, light splitting unit and reflection assembly;

[0008] The image source device is used to emit a first polarized light having a first polarization direction and a second polarized light having a second polarization direction, wherein the first polarization direction and the second polarization direction are perpendicular to each other;

[0009] The light splitting unit is arranged in the propagation direction of the first polarized light and the second polarized light, and the light splitting unit is used to reflect the first polarized light to form a first imaging light to propagate to the eye box;

[0010] The light splitting unit is further used to allow the second polarized light to pass through;

[0011] The reflection component is arranged in the propagation direction of the second polarized light passing through the splitting unit, and the reflection component includes multiple reflectors. After the second polarized light passes through the splitting unit, it is reflected multiple times in the multiple reflectors and then emitted through the splitting unit again to form a second imaging light, so as to propagate to the eye box, so that the optical path of the second polarized light to form the second imaging light is greater than the optical path of the first polarized light to form the first imaging light, so that the first imaging light and the second imaging light constitute optical depth of field imaging.

[0012] Preferably, the reflection component includes three reflectors, namely a first reflector, a second reflector and a third reflector. After the second polarized light passes through the spectroscopic unit, it is incident on the first reflector, and after being reflected by the first reflector, it is incident on the second reflector, and after being reflected by the second reflector, it is incident on the third reflector. After being reflected by the third reflector, the second polarized light passes through the spectroscopic unit again to complete the emission to form the second imaging light.

[0013] Preferably, the three reflectors are arranged in a "concave" shape, and the second polarized light passing through the light splitting unit is reflected multiple times in the "concave" shaped reflective component and finally passes through the light splitting unit again to be emitted to form the second imaging light.

[0014] Preferably, the first polarized light is P light, and the second polarized light is S light; the spectroscopic unit includes a first surface and a second surface, the P light is reflected on the first surface after being incident on the first surface, the S light is emitted through the first surface and the second surface, the S light is reflected by three reflectors, namely, the first reflector, the second reflector, and the third reflector, through the first surface, and then emitted from the second surface through the spectroscopic unit to form the second imaging light.

[0015] Preferably, the P light and the S light incident on the light splitting unit are parallel, and the P light and the S light emitted by the light splitting unit are parallel.

[0016] Preferably, the spectroscopic unit is arranged corresponding to the "concave"-shaped notch formed by the three reflectors, and the three reflectors are arranged on one side of the second surface of the spectroscopic unit, the first reflector and the third reflector are arranged perpendicular to the second surface, the second reflector is located between the first reflector and the third reflector, and the second reflector is parallel to the second surface, so that the first reflector, the second reflector and the third reflector are arranged in a "concave" shape; the image source device is arranged on one side of the first surface of the spectroscopic unit.

[0017] Preferably, the image source device comprises an image source and a polarization unit, the image source is used to emit light, and the polarized light is used to process the light into the first polarized light and the second polarized light.

[0018] Preferably, the light splitting unit is a polarizing plate or a light splitting prism, wherein inner and outer sides of an inclined surface of the light splitting prism respectively form the first surface and the second surface.

[0019] Preferably, the P light passing through the polarization unit is reflected at a Brewster angle on the first surface of the light splitting unit.

[0020] In a second aspect, the present application provides a HUD device, comprising the above-mentioned optical system for naked-eye 3D imaging.

[0021] In a third aspect, the present application provides a vehicle comprising the above-mentioned HUD device.

[0022] Beneficial effects:

[0023] The present application provides an optical system for naked-eye 3D imaging, in which a first polarized light and a second polarized light having perpendicular polarization directions are emitted by an image source device, a spectrometer is arranged in the propagation direction of the first polarized light and the second polarized light, the spectrometer can reflect the first polarized light to form a first imaging light, and can also allow the second polarized light to pass through, a reflection component is arranged in the propagation direction of the second polarized light passing through the spectrometer, the reflection component includes a plurality of reflectors, after the second polarized light passes through the spectrometer, it is reflected multiple times in the multiple reflectors and then passes through the spectrometer again to be emitted to form a second imaging light, since the second polarized light is reflected multiple times by the multiple reflectors, the optical path of the second polarized light forming the second imaging light is greater than the optical path of the first polarized light forming the first imaging light, so that the first imaging light and the second imaging light entering the left and right eyes of the viewer form a depth of field effect, thereby achieving the naked-eye 3D effect.

[0024] Other beneficial effects of the present invention will be explained in the specific implementation manner through the introduction of specific technical features and technical solutions. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred embodiments of the optical system, HUD device and vehicle for naked eye 3D imaging of the present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the imaging principle of naked-eye 3D in the related art;

[0027] Figure 2 The figure is a schematic diagram of the structure of an optical system for naked-eye 3D imaging according to a preferred embodiment of the present invention.

[0028] 101. display; 102. parallax barrier structure;

[0029] 1. Polarization unit; 2. Spectral unit; 3. Reflection component; 31. First reflector; 32. Second reflector; 33. Third reflector. DETAILED DESCRIPTION

[0030] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid confusing the essence of the present invention, known methods, processes, procedures, and components are not described in detail.

[0031] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0032] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0033] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] In the related art, the naked-eye spectroscopic 3D display technology improves slightly different images for the left and right eyes of the observer respectively, deceiving the observer's brain, so that the observer can produce a 3D visual effect without wearing 3D glasses. Figure 1 As shown, it is a light barrier type stereoscopic display technology. The display 101 includes two types of pixels, respectively represented as VaR and VaL. VaR is used to emit light carrying right eye image information (hereinafter referred to as right eye light), and VaL is used to emit light carrying left eye image information (hereinafter referred to as left eye light). The parallax barrier structure 102 is located on the light-emitting side of the display 101. When it is in an ideal position relative to the display 101 and relative to the observer's eyes, the observer's right eye can almost only receive the right eye light emitted by VaR, and the observer's left eye can almost only receive the left eye light emitted by VaL. In this way, the observer's left eye and right eye respectively see different images, so that the observer has a visual effect of watching a 3D image.

[0035] The above-mentioned light barrier type stereoscopic display technology requires that the parallax barrier structure is located at the display and the observer's eyes are at a certain ideal position, so that the observer's right eye can almost only receive the right eye light emitted by VaR, and the observer's left eye can almost only receive the left eye light emitted by VaL. That is, the parallax barrier structure, the display and the observer's eyes need to be at a specific angle position to enable the observer to have a visual effect of viewing a 3D image. This technology has many limitations, and the errors in the implementation process need to be controlled so that the parallax barrier structure, the display and the observer's eyes can meet the specific angle position as much as possible.

[0036] Example 1

[0037] The present application embodiment provides a specific implementation of an optical system for naked-eye 3D imaging, such as Figure 2 As shown, it includes an image source device, a spectrometer unit 2 and a reflection component 3; wherein the image source device is used to emit a first polarized light and a second polarized light with perpendicular polarization directions, the spectrometer unit 2 is arranged in the propagation direction of the first polarized light and the second polarized light, the spectrometer unit 2 is used to reflect the first polarized light and form a first imaging light to propagate to the eye box, and the spectrometer unit 2 allows the second polarized light to pass through, the reflection component 3 is arranged in the propagation direction of the second polarized light passing through the spectrometer unit 2, the reflection component 3 includes a plurality of reflectors, the second polarized light passing through the spectrometer unit 2 is reflected multiple times in the plurality of reflectors, and is emitted again through the spectrometer unit 2 to form a second imaging light to propagate to the eye box, the second polarized light is reflected multiple times through the spectrometer unit 2 and the reflection component 3, so that the optical path of the second imaging light formed by the second polarized light is greater than the optical path of the first imaging light formed by the first polarized light, due to the difference in optical paths, the first imaging light and the second imaging light that simultaneously enter the left and right eyes of the viewer form a depth of field effect, thereby achieving the naked eye 3D effect. There is no need to make the two polarized lights enter the left and right eyes separately, and there is no need to observe at a specific angle to produce the naked-eye 3D effect in the observer's eyes. The structure is simple, and the observer does not need to stand in a specific position during the observation process to produce the naked-eye 3D effect. The present application achieves the naked-eye 3D effect when the two polarized lights are incident on the human eye by separating the two polarized lights into different optical paths.

[0038] In addition, compared with the naked-eye 3D solution in the prior art, the left and right eyes are required to view different imaging lights, which limits the distance between the human eye and the optical system. At the same time, the angle and position between the parallax barrier structure 102 and the display 101 need to be accurately installed; since the present application uses different optical paths to achieve the purpose of depth of field effect, there is no need to distinguish between the imaging lights viewed by the left and right eyes, and the reflective component 3 is installed on the propagation path of the second polarized light. As long as the second polarized light can be emitted again through the splitting unit 2, there is no need to limit the distance from the human eye to the optical system. As long as the human eye can receive the imaging light, the naked-eye 3D effect can be achieved, which increases the application scenarios and scope of naked-eye 3D and improves the user experience.

[0039] In this embodiment, the reflection component 3 includes three reflection mirrors, namely a first reflection mirror 31, a second reflection mirror 32 and a third reflection mirror 33; specifically, after the second polarized light passes through the spectroscopic unit 2, it is incident on the first reflection mirror 31, reflected by the first reflection mirror 31 to the second reflection mirror 32, and then reflected by the second reflection mirror 32 to the third reflection mirror 33. After being reflected by the third reflection mirror 33, the second polarized light passes through the spectroscopic unit 2 again to complete the emission to form the second imaging light.

[0040] Furthermore, the three reflectors are arranged in a "concave" shape, and the second polarized light passing through the spectrometer unit 2 is incident on the reflective component arranged in the "concave" shape, and is reflected multiple times by the first reflector 31, the second reflector 32 and the third reflector 33 in sequence, and finally passes through the spectrometer unit 2 again to be emitted to form a second imaging light.

[0041] Furthermore, the first polarized light is P light, the second polarized light is S light, and the light splitting unit 2 includes a first surface and a second surface. Figure 2 As shown, the inner and outer sides of one side surface of the spectroscopic unit 2 respectively form a first surface and a second surface. After the P light enters the spectroscopic unit 2, it is reflected on the first surface to form a first imaging light. The S light passes through the first surface, and after multiple reflections in the reflective component 3, it is emitted from the second surface through the spectroscopic unit 2 to form a second imaging light.

[0042] In some other embodiments, the reflective component 3 can also be other numbers of reflectors, such as four, five or even more. As long as its angle is adjusted, the second polarized light passing through the spectroscopic unit 2 can be reflected multiple times and finally emitted through the spectroscopic unit 2 again to form a second imaging light.

[0043] In this embodiment, the P light and S light incident on the spectroscopic unit 2 are parallel, and the first imaging light and the second imaging light finally emitted from the spectroscopic unit 2 are also parallel, so that the observer can form a 3D pattern with the P light and S light with different optical paths at a better angle, thereby improving the observer's viewing effect.

[0044] In this embodiment, the image source device includes an image source (not shown in the figure) and a polarization unit 1. The image source is used to emit light with an image, and the polarization unit 1 is used to process the light into a first polarized light and a second polarized light. Specifically, the polarization unit 1 can be a polarizer.

[0045] In this embodiment, Figure 2 As shown, the light splitting unit 2 is arranged corresponding to the "concave"-shaped notch formed by the three reflectors, the three reflectors are arranged on the second side of the light splitting unit 2, and the three reflectors and the second side form a shape similar to a quadrilateral, so that the second polarized light passing through the light splitting unit 2 can be incident on the "concave"-shaped shape formed by the three reflectors for multiple reflections, thereby increasing the optical path of the second polarized light; specifically, the image source device is located on the first side of the light splitting unit 2, and the reflection component 3 is arranged on the second side of the light splitting unit 2, wherein the first reflector 31 and the third reflector 33 are both arranged perpendicular to the second side of the light splitting unit 2, and the second reflector 32 is located between the first reflector 31 and The second reflector 32 is parallel to the second surface of the spectrometer unit 2, and the third reflector 33 is between them. Due to the positional relationship among the first reflector 31, the second reflector 32 and the third reflector 33, a "concave" shape arrangement is finally formed. Further, the positional relationship between the first reflector 31, the second reflector 32 and the third reflector 33 relative to the spectrometer unit 2 is such that the first reflector 31, the second reflector 32, the third reflector 33 and the second surface of the spectrometer unit 2 form a quadrilateral. The second polarized light passing through the spectrometer unit 2 is reflected by the first reflector 31, the second reflector 32 and the third reflector 33 in sequence and then emitted from the second surface of the spectrometer unit 2 to form a second imaging light.

[0046] In this embodiment, the light splitting unit 2 is a polarizing plate or a light splitting prism. Specifically, this embodiment adopts a light splitting prism, and the inner and outer sides of the inclined surface of the light splitting prism are respectively a first surface and a second surface.

[0047] Furthermore, if Figure 2 As shown, the P light is directly reflected on the first surface to form the first imaging light, and the S light passes through the first surface and the second surface, and after being reflected by the first reflector 31, the second reflector 32, and the third reflector 33, it is emitted from the second surface of the spectroscopic unit 2 to form the second imaging light.

[0048] In this embodiment, the P light passing through the polarization unit 1 is reflected at the Brewster angle on the first surface of the spectroscopic unit 2. The Brewster angle allows the P light to be reflected at a specific angle on the first surface of the spectroscopic unit 2 when incident, generating linearly polarized light and improving visual clarity.

[0049] Example 2

[0050] This embodiment provides a specific implementation of a HUD device, including the optical system for naked-eye 3D imaging in Embodiment 1. In this embodiment, the HUD device is applied in a head-up display of a car.

[0051] According to the optical system for naked-eye 3D imaging provided in Example 1, a first polarized light and a second polarized light with perpendicular polarization directions are emitted through an image source device, and a spectrometer unit 2 is arranged in the propagation direction of the first polarized light and the second polarized light. The spectrometer unit 2 can reflect the first polarized light to form a first imaging light, and can also allow the second polarized light to pass through. A reflection component 3 is arranged in the propagation direction of the second polarized light passing through the spectrometer unit 2, and the reflection component 3 includes a plurality of reflectors. After the second polarized light passes through the spectrometer unit 2, it is reflected multiple times in the multiple reflectors and then passes through the spectrometer unit 2 again to emit to form a second imaging light. Since the second polarized light is reflected multiple times by the multiple reflectors, the optical path of the second polarized light forming the second imaging light is greater than the optical path of the first polarized light forming the first imaging light, so that the first imaging light and the second imaging light that enter the left and right eyes of the viewer at the same time form a depth of field effect, thereby achieving the naked-eye 3D effect. There is no need to make the two polarized lights enter the left and right eyes separately, and there is no need to observe at a specific angle to produce the naked-eye 3D effect in the observer's eyes. The structure is simple, and the observer does not need to stand in a specific position during the observation process to produce the naked-eye 3D effect. The present application achieves the naked-eye 3D effect when the two polarized lights are incident on the human eye by separating the two polarized lights into different optical paths.

[0052] In addition, compared with the naked-eye 3D solution in the prior art, the left and right eyes are required to view different imaging lights, which limits the distance between the human eye and the optical system. At the same time, the angle and position between the parallax barrier structure 102 and the display 101 need to be accurately installed; since the present application uses different optical paths to achieve the purpose of depth of field effect, there is no need to distinguish between the imaging lights viewed by the left and right eyes, and the reflective component 3 is installed on the propagation path of the second polarized light. As long as the second polarized light can be emitted again through the splitting unit 2, there is no need to limit the distance from the human eye to the optical system. As long as the human eye can receive the imaging light, the naked-eye 3D effect can be achieved, which increases the application scenarios and scope of naked-eye 3D and improves the user experience.

[0053] Example 3

[0054] This embodiment provides a specific implementation of a vehicle, including the HUD device in Example 2.

[0055] Those skilled in the art will appreciate that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0056] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. An optical system for naked-eye 3D imaging, characterized in that: include: Image source device, light splitting unit (2) and reflection component (3); The image source device is used to emit a first polarized light having a first polarization direction and a second polarized light having a second polarization direction, wherein the first polarization direction and the second polarization direction are perpendicular to each other; The light splitting unit (2) is arranged in the propagation direction of the first polarized light and the second polarized light, and the light splitting unit (2) is used to reflect the first polarized light to form a first imaging light to propagate to the eye box; The light splitting unit (2) is also used to allow the second polarized light to pass through; The reflection component (3) is arranged in the propagation direction of the second polarized light passing through the light splitting unit (2), and the reflection component (3) includes a plurality of reflectors. After the second polarized light passes through the light splitting unit (2), it is reflected multiple times in the plurality of reflectors and then emitted again through the light splitting unit (2) to form a second imaging light, which is then propagated to the eye box, so that the optical path of the second polarized light propagating to form the second imaging light is greater than the optical path of the first polarized light propagating to form the first imaging light, so that the first imaging light and the second imaging light form an optical depth of field imaging.

2. The optical system for naked-eye 3D imaging according to claim 1, characterized in that: The reflection component (3) comprises three reflection mirrors, namely a first reflection mirror (31), a second reflection mirror (32) and a third reflection mirror (33); after the second polarized light passes through the light splitting unit (2), it is incident on the first reflection mirror (31); after being reflected by the first reflection mirror (31), it is incident on the second reflection mirror (32); after being reflected by the second reflection mirror (32), it is incident on the third reflection mirror (33); after being reflected by the third reflection mirror, the second polarized light passes through the light splitting unit (2) again to be emitted to form the second imaging light.

3. The optical system for naked-eye 3D imaging according to claim 2, characterized in that: The three reflectors are arranged in a "concave" shape, and the second polarized light passing through the light splitting unit (2) is reflected multiple times in the "concave" shaped reflective component and finally passes through the light splitting unit (2) again to be emitted to form the second imaging light.

4. The optical system for naked-eye 3D imaging according to claim 3, characterized in that: The first polarized light is P light, and the second polarized light is S light; the light splitting unit (2) comprises a first surface and a second surface, the P light is incident on the first surface and then reflected on the first surface, the S light is emitted through the first surface and the second surface, the S light is emitted through the first surface and then reflected by three reflectors, namely, a first reflector (31), a second reflector (32), and a third reflector (33), and then emitted from the second surface through the light splitting unit (2) to form the second imaging light.

5. The optical system for naked-eye 3D imaging according to claim 4, characterized in that: The P light and the S light incident on the light splitting unit (2) are parallel, and the P light and the S light emitted by the light splitting unit (2) are parallel.

6. The optical system for naked-eye 3D imaging according to claim 5, characterized in that: The light splitting unit (2) is arranged corresponding to the "concave"-shaped notch formed by the three reflectors, and the three reflectors are arranged on one side of the second surface of the light splitting unit (2), the first reflector (31) and the third reflector (33) are arranged perpendicular to the second surface, the second reflector (32) is located between the first reflector (31) and the third reflector (33), and the second reflector (32) is parallel to the second surface; the image source device is located on one side of the first surface of the light splitting unit (2).

7. The optical system for naked-eye 3D imaging according to any one of claims 1 to 6, characterized in that: The image source device comprises an image source and a polarization unit (1), wherein the image source is used to emit light, and the polarized light is used to process the light into the first polarized light and the second polarized light.

8. The optical system for naked-eye 3D imaging according to any one of claims 4 to 6, characterized in that: The light splitting unit (2) is a polarizing plate or a light splitting prism, wherein the first surface and the second surface are formed respectively on the inner and outer sides of the inclined surface of the light splitting prism.

9. A HUD device, characterized in that: Comprising an optical system for naked-eye 3D imaging according to any one of claims 1-8.

10. A vehicle, characterized in that: Including the HUD device as described in claim 9.

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