Image display unit, head-up display device and automobile

Abstract

The utility model provides an image display unit, head-up display device and automobile, relate to optical imaging technical field, image display unit includes image source, projection lens and optical element, light emitted from image source can pass through optical element and then enter the projection lens to realize the imaging of different depth of field. The optical element is additionally arranged between the image source and the projection lens, light rays emitted from the image source can pass through the optical element and then enter the diffusion sheet, and through the arrangement of the optical element, imaging of different depths of field can be achieved, so that the position of a focal plane passing through the image display unit is adjusted, and a clear image enters the diffusion sheet. If the position of the diffusion sheet is changed, the optical element can be correspondingly adjusted so as to ensure that a clear image can be incident on the diffusion sheet. According to the utility model, different depth-of-field imaging can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging, and particularly relates to an image display unit, a head-up display device and an automobile. Background Art

[0002] A head-up display device, namely HUD (Head-Up Display), also known as a head-up display system, is a device that directly projects important information in the form of images or text in front of the line of sight of a driver or an operator. The head-up display device projects the light emitted by the image display unit to form a virtual image several meters in front of the vehicle. Various information such as vehicle speed and fuel gauge can be displayed on the virtual image, and the driver does not need to look down at the instrument panel anymore, thereby greatly reducing the driving accident rate.

[0003] With the diversification of user needs, it is required to be able to present virtual images at different positions. However, adjusting the position of the virtual image will affect the imaging clarity.

[0004] In view of this, it is necessary to provide a new image display unit, a head-up display device and an automobile to solve or at least alleviate the above technical defects. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide an image display unit, a head-up display device and an automobile, aiming to solve the technical problem that adjusting the position of the virtual image of the head-up display device in the related art affects the imaging clarity.

[0006] To achieve the above purpose, according to one aspect of the utility model, the utility model provides an image display unit, which includes an image source, a projection lens and an optical element. The light emitted from the image source can pass through the optical element and then enter the projection lens to achieve imaging with different depths of field.

[0007] In some embodiments, the optical element includes a glass slide, and the glass slide is movably installed to cut into or cut out the optical path.

[0008] In some embodiments, the optical element includes a plurality of glass slides with different thicknesses, and the glass slides with different thicknesses are movably installed to cut into or cut out the optical path.

[0009] In some embodiments, the optical element includes a liquid lens, and different depths of field imaging are achieved by controlling the thickness change of the liquid lens.

[0010] In some embodiments, the optical element includes a plurality of glass slides with different refractive indexes, and the glass slides with different refractive indexes are movably installed to cut into or cut out the optical path.

[0011] In some embodiments, the optical element includes a glass slide, a part of the glass slide extends into the optical path, a part of the light emitted from the image source is incident on the projection lens after passing through the glass slide, and another part of the light is directly incident on the projection lens.

[0012] In some embodiments, the optical element further includes a reflector, and the light is reflected onto the projection lens after passing through the reflector.

[0013] In some embodiments, a part of the glass slide extends into the optical path; or, the entire glass slide extends into the optical path.

[0014] In some embodiments, the reflector is a plane mirror or a prism.

[0015] According to another aspect of the present invention, the present invention further provides a head-up display device, including an adjustment component, a reflector, a reflection panel, and the above-mentioned image display unit. The image display unit is used to emit light, the light is incident on the reflector after passing through the adjustment component, the reflector reflects the light to the reflection panel, and the reflection panel reflects the received light and then is incident on the eye box; the adjustment component is used to adjust the light incident on the reflector from the image display unit to adjust the virtual image seen by the human eye.

[0016] In some embodiments, the adjustment component includes a first diffuser and a second diffuser. The first diffuser and the second diffuser are arranged at intervals along the propagation direction of the light, and the first diffuser and the second diffuser are vertically offset. A part of the light is incident on the reflector after passing through the first diffuser, and another part of the light is incident on the reflector after passing through the second diffuser, so as to enable the human eye to see virtual images at two different positions.

[0017] In some embodiments, the first diffuser is located below the second diffuser, and the top of the first diffuser is flush with the bottom of the second diffuser.

[0018] In some embodiments, the adjustment component at least includes a first diffuser and a second diffuser. The first diffuser and the second diffuser are arranged at intervals along the propagation direction of the light, and the first diffuser and the second diffuser are respectively installed in a telescopic manner, so that one of the first diffuser and the second diffuser enters the optical path to adjust the position of the virtual image.

[0019] In some embodiments, the adjustment component includes a driving member and a diffuser connected to the driving member. The driving member is used to drive the diffuser to move along the propagation direction of the light to adjust the position of the virtual image.

[0020] According to another aspect of the present utility model, the present utility model further provides an automobile, which includes the above-mentioned head-up display device, and the reflection panel is the windshield of the automobile.

[0021] In the above solution, the image display unit includes an image source, a projection lens, and an optical element. The light emitted from the image source can pass through the optical element and then enter the projection lens to achieve imaging with different depths of field. An optical element is added between the image source and the projection lens. The light emitted from the image source can pass through the optical element before entering the adjustment component. Through the setting of the optical element, imaging with different depths of field can be achieved to adjust the position of the focal plane passing through the image display unit, and project a clear image onto the diffuser. If the position of the diffuser changes, the optical element can be adjusted accordingly to ensure that a clear image can be projected onto the diffuser. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 FIG. 12 is a schematic structural diagram of an existing image display unit;

[0024] Figure 2 FIG. 16 is a schematic structural diagram of an image display unit of the head-up display device according to an embodiment of the present utility model;

[0025] Figure 3 FIG. 20 is another schematic structural diagram of an image display unit of the head-up display device according to an embodiment of the present utility model;

[0026] Figure 4 FIG. 24 is a schematic structural diagram of an image display unit of the head-up display device according to an embodiment of the present utility model including a plane mirror;

[0027] Figure 5 FIG. 28 is a schematic structural diagram of an image display unit of the head-up display device according to an embodiment of the present utility model including a prism.

[0028] Figure 6 FIG. 32 is a schematic structural diagram of a head-up display device according to an embodiment of the present utility model;

[0029] Figure 7 FIG. 36 is another schematic structural diagram of a head-up display device according to an embodiment of the present utility model;

[0030] Figure 8Another structural schematic diagram of the head-up display device according to an embodiment of the present invention;

[0031] Label description:

[0032] 100, head-up display device; 10, image display unit; 11, image source; 12, projection lens; 13, optical element; 131, glass slide; 132, reflector; 1321, plane mirror; 1322, prism; 20, adjustment assembly; 21, first diffuser; 22, second diffuser; 23, diffuser; 25, drive member; 30, mirror; 40, reflection panel; A, eye box.

[0033] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that all directional indications (such as up, down...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0037] Moreover, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0038] The head-up display device can achieve the combination of real images and virtual images. For example, when applied to a vehicle, the head-up display device projects a virtual image several meters in front of the vehicle windshield with the light emitted by the image display unit. Various information such as vehicle speed and fuel gauge can be displayed on the virtual image. The driver no longer needs to look down at the instrument panel, and at the same time can see the situation of the outside road surface (real image) through the windshield, thus greatly reducing the driving accident rate. With the diversification of user needs, it is required to be able to present virtual images at different positions. However, the adjustment of the virtual image position may affect the imaging clarity.

[0039] After careful research, the applicant found that in the current related technologies, the adjustment of the virtual image position is mainly achieved by adjusting the position of the diffuser sheet, or by using multiple diffuser sheets arranged at different positions to achieve multiple virtual image formations. However, due to the limited depth of field of the lens, the traditional image display unit cannot present clear images at different positions simultaneously.

[0040] Therefore, the present utility model provides an image display unit.

[0041] Referring to Figure 2 , according to one aspect of the present utility model, the present utility model provides an image display unit. The image display unit 10 includes an image source 11, a projection lens 12, and an optical element 13. At least the light emitted from the image source 11 can pass through the optical element 13 and then be incident on the projection lens 12, and be incident on the adjustment assembly 20 from the projection lens 12 to achieve different depth-of-field imaging.

[0042] The image display unit 10, which can also be called an image generation unit, is used to emit light, and the light contains image information. Referring to Figure 1 , in the current related technologies, a general image display unit 10 includes an image source 11 and a projection lens 12. The light emitted from the image source 11 is incident on the adjustment assembly 20 after passing through the projection lens 12. However, due to the limited depth of field of the projection lens 12, it is difficult to ensure that the image can be clearly imaged at different positions. In different embodiments corresponding to the head-up display device 100, the adjustment assembly 20 here can be a first diffuser sheet 21, a second diffuser sheet 22, or a diffuser sheet 23. If the position of the diffuser sheet 23 needs to be changed to achieve different virtual image positions, then the image display unit 10 will be difficult to achieve a clear image. As Figure 7 cannot ensure clear imaging at the positions of both the first diffuser sheet 21 and the second diffuser sheet 22, resulting in the inability to correctly identify the image content, affecting the customer experience, and at the same time there are potential safety hazards.

[0043] Therefore, referring to Figure 2, in this embodiment, an optical element 13 is added between the image source 11 and the projection lens 12. The light emitted from the image source 11 can be incident on the adjustment assembly 20 after passing through the optical element 13. By setting the optical element 13, a clear image can be incident on the diffusion sheet 23 through the position of the focal plane of the image display unit 10 (the position where the image display is the clearest). If the position of the diffusion sheet changes, the optical element can be adjusted accordingly to ensure that a clear image can be incident on the diffusion sheet 23, ensuring that the user can see a clear image. It should be noted that although the diffusion sheet 23 is labeled in the figure, in fact, it can also be the first diffusion sheet 21 or the second diffusion sheet 22.

[0044] In some embodiments, the optical element 13 includes a glass sheet 131, and the glass sheet 131 is movably installed to cut into or out of the optical path. The glass sheet 131 can also be a transparent flat plate, and imaging with different depths of field can be achieved by cutting the flat plate into or out of the optical path. Specifically, the glass sheet 131 cutting into the optical path means that the light emitted from the image source 11 will pass through the glass sheet 131 and then be incident on the projection lens 12; the glass sheet 131 cutting out of the optical path means that the light emitted from the image source 11 will be directly incident on the projection lens 12 without passing through the glass sheet 131. Adding the glass sheet 131 can make the projection distance longer and the image projected onto the diffusion sheet 23 farther. Therefore, different depths of field imaging can be achieved by cutting the glass sheet 131 into or out of the optical path.

[0045] In some embodiments, the optical element 13 includes a plurality of glass sheets 131 with different thicknesses, and the glass sheets 131 are movably installed to cut into or out of the optical path.

[0046] Adding the glass slide 131 can increase the projection distance, making the image projected onto the diffuser 23 of the adjustment assembly 20 farther away. The thicker the added glass slide 131, the longer the projection distance. The specific principle is as follows: The refractive index of air is 1, and the refractive index n of the glass slide 131 is generally greater than 1. The equivalent air thickness of the glass slide 131 is T / n, where T represents the thickness of the glass slide 131. The equivalent air thickness between the image source 11 and the projection lens 12 is reduced by (1 - 1 / n)*T. Adding the glass slide 131 reduces the optical path between the image source 11 and the projection lens 12, thus increasing the projection distance. The light rays projected from the projection lens 12 are also projected onto the diffuser 23 (it may also be the first diffuser 21 or the second diffuser 22). That is to say, when we move the diffuser 23 of the adjustment assembly 20 along the light propagation direction to adjust the position or size of the virtual image, it may cause a decrease in the image clarity. To ensure the imaging clarity, we can switch glass slides 131 with different thicknesses to adjust the position of the focal plane of the projection lens 12, achieving different depth-of-field imaging, so that the focal plane of the projection lens is located on the diffuser 23, that is, projecting a clearer image onto the diffuser 23 and improving the imaging clarity, reducing the risk of image blurring caused by the position adjustment of the diffuser 23.

[0047] In some embodiments, the optical element 13 includes a liquid lens, and different depth-of-field imaging is achieved by controlling the thickness change of the liquid lens. The liquid lens can achieve different thickness changes, and thus different depth-of-field imaging. The specific principle is similar to that of using glass slides 13 with different thicknesses in the foregoing embodiments and will not be elaborated here.

[0048] In some embodiments, the optical element 13 includes a plurality of glass slides 131 with different refractive indices, and the glass slides 131 are movably installed to cut into or out of the optical path. Adding the glass slide 131 can increase the projection distance, making the image projected onto the diffuser 23 of the adjustment assembly 20 farther away. The specific principle is as follows: The refractive index of air is 1, and the refractive index n of the glass slide 131 is generally greater than 1. The equivalent air thickness of the glass slide 131 is T / n. Adding the glass slide 131 reduces the optical path between the image source 11 and the projection lens 12, thus increasing the projection distance. Moreover, with different refractive indices of the glass slides 131, the projection distances are also different. The light rays projected from the projection lens 12 are also projected onto the diffuser 23 (it may also be the first diffuser 21 or the second diffuser 22). That is to say, when we move the diffuser 23 of the adjustment assembly 20 along the light propagation direction to adjust the position or size of the virtual image, it may cause a decrease in the image clarity. To ensure the imaging clarity, we can switch glass slides 131 with different thicknesses to adjust the position of the focal plane of the projection lens 12, so that the focal plane of the projection lens is located on the diffuser 23, that is, projecting a clearer image onto the diffuser 23 and improving the imaging clarity.

[0049] In some embodiments, the image source 11 is not limited to DMD (Digital Micromirror Devices), Lcos (Liquid Crystal on Silicon), TFT (Thin Film Transistor), LED (Light Emitting Diode), OLED (Organic Light-Emitting Diode), etc. The glass slide 131 can be made of transparent flat materials, such as optical glass, crystal, optical plastic, transparent optical silica gel, or liquid, etc., with a thickness of 0.1 mm to 3 mm. The glass slide 131 is disposed near the image source 11, and the distance from the glass slide 131 to the image source 11 in the direction perpendicular to the plane of the image source 11 is not greater than 20 mm.

[0050] In some embodiments, the glass slide 131 can be composed of multiple small pieces with different refractive indices and different thicknesses. The optical paths passing through different small pieces will form images at different distances and at different positions perpendicular to the light beam.

[0051] Refer to Figure 3 , in some embodiments, the optical element 13 includes the glass slide 131. The glass slide 131 partially extends into the optical path. A part of the light rays emitted from the image source 11 passes through the glass slide 131 and then is incident on the projection lens 12, and another part of the light rays is directly incident on the projection lens 12. This embodiment corresponds to an application scenario where two virtual images need to be seen. The optical path still refers to the propagation path of the light rays. The glass slide 131 partially extending into the optical path means that only a part of the light rays emitted from the image source 11 passes through the glass slide 131, and another part is directly incident on the projection lens 12 without being adjusted by the glass slide 131. In this way, the light rays passing through the glass slide 131 will form an image at a relatively far distance, such as Figure 3 the position indicated by the arrow 21 in, and the light rays not passing through the glass slide 131 will form an image at a relatively near position, such as the position indicated by the arrow 22. It should be noted that marking 22 means that when the second diffuser 22 is placed at this position, a clear image can be received. Marking 21 means that when the first diffuser 21 is placed at this position, a clear image can be received. This corresponds to the situation where when a user needs to see two virtual images, we can make the glass slide 131 of the optical element 13 only partially extend into the optical path, so that two clear images can be displayed at different positions.

[0052] Refer to Figure 4 and Figure 5, in some embodiments, the optical element 13 includes a glass sheet 131 and a reflector 132. The light rays emitted from the image source 11 pass through the glass sheet 131 and the reflector 132 in sequence and then are reflected onto the projection lens 12. Due to the volume limitation of the head-up display device 100 or the need to extend the optical path, a reflector 132 can be added to the optical element 13. The reflector 132 mainly reflects the light rays emitted from the image source 11 to change the propagation direction of the light. When a part of the glass sheet 131 extends into the optical path, part of the light rays emitted from the image source 11 pass through the glass sheet 131 in sequence, are incident on the reflector 132 and then reflected onto the projection lens 12, and the other part is directly incident on the reflector 132 and reflected onto the projection lens 12. When the entire glass sheet 131 extends into the optical path, the light rays emitted from the image source 11 pass through the glass sheet 131 and the reflector 132 in sequence and then are reflected onto the projection lens 12. Those skilled in the art can set the position of the glass sheet 131 in the optical path according to the number of virtual images that need to be seen finally.

[0053] In some embodiments, the reflector 132 is a plane mirror 1321 or a prism 1322. Refer to Figure 4 , the reflector 132 can be a plane mirror 1321. The plane mirror 1321 can be a piece of glass and is arranged at an angle of 45 degrees with the incident light rays. Refer to Figure 5 , the reflector 132 can also be a triangular prism, and the incident light rays are reflected on the hypotenuse of the triangular prism and then incident into the projection lens 12.

[0054] Refer to Figures 6 to 8 , according to another aspect of the present invention, the present invention also provides a head-up display device 100. The head-up display device 100 includes an adjustment component 20, a reflector 30 and a reflection panel 40, and the above-mentioned image display unit 10. The image display unit 10 is used to emit light rays. The light rays pass through the adjustment component 20 and then are incident on the reflector 30. The reflector 30 reflects the light rays to the reflection panel 40. The reflection panel 40 reflects the received light rays and then is incident on the eye box A; the adjustment component 20 is used to adjust the light rays incident from the image display unit 10 to the reflector 30 to adjust the virtual image seen by the human eye.

[0055] The reflector 30 can be a concave mirror to reflect the received light rays to the reflection panel 40. The reflection panel 40 reflects the received light rays reflected from the reflector 30 to the eye box A and is received by the human eye. At this time, the virtual image seen by the human eye is along the reverse extension line of the light rays reflected by the reflection panel 40. As shown by B in Figure 3 , B represents the position of the virtual image.

[0056] Due to differences in height, habits, or the degree of adaptation of the eyeballs among different users, there will be different requirements for the position and size of the virtual image observed. A fixed virtual image position is difficult to meet the needs of different groups of people, resulting in many users being uncomfortable with the head-up display device 100. In this embodiment, by disposing the adjustment component 20 between the image display unit 10 and the reflector 30, the light emitted from the image display unit 10 needs to be adjusted by the adjustment component 20 before being incident on the reflecting member 132. This can be used to adjust the position, size, and number of virtual images seen by the human eye to adapt to the various needs of different groups of people. At the same time, due to the adoption of the image display unit 10 of the embodiment of the present utility model, the depth of field of the image display unit 10 can be adjusted through the optical element 13. When the adjustment component 20 makes an adjustment, different depth-of-field imaging can be achieved by adjusting the optical element 13 to ensure clear imaging. Since the head-up display device 100 includes all the technical solutions of the above-mentioned all embodiments, therefore, it has at least all the beneficial effects brought by the above-mentioned all technical solutions, which will not be elaborated one by one here. Moreover, this embodiment has the advantages of a wide range of applicable scenarios and being able to effectively adapt to the needs of different groups of people.

[0057] By adopting different forms of the adjustment component 20, different forms of adjustment of the virtual image seen by the human eye can be achieved. In the present utility model, the adjustment component 20 can at least include the following three embodiments:

[0058] Referring to Figure 6 , in the first embodiment, the adjustment component 20 includes a first diffuser 21 and a second diffuser 22. The first diffuser 21 and the second diffuser 22 are arranged at intervals along the propagation direction of the light, and the first diffuser 21 and the second diffuser 22 are arranged vertically offset. A part of the light is incident on the reflector 30 through the first diffuser 21, and another part of the light is incident on the reflector 30 through the second diffuser 22, so as to enable the human eye to see two virtual images at different positions. Figure 1 The distance of the first diffuser 21 shown relative to the reflector 30 is greater than the distance between the second diffuser 22 and the reflector 30. The two are arranged vertically offset, and the vertical direction is as Figure 1As shown by arrow H. The light emitted from the image display unit 10 is divided into two parts. One part is incident on the mirror 30 after passing through the first diffuser 21, and the other part is incident on the mirror 30 after passing through the second diffuser 22. In this way, after the light passing through the first diffuser 21 is reflected successively by the mirror 30 and the reflection panel 40, a virtual image located at B1 can be seen at the eyebox A; and after the light passing through the second diffuser 22 is reflected by the mirror 30 and the reflection panel 40, a virtual image located at B2 can be seen at the eyebox A. In this way, through the adjustment of the adjustment component 20, the human eye can see two virtual images at different positions, and according to the different image information of the image display unit 10, the virtual images seen at B1 and B2 are two virtual images with different image contents. At the same time, due to the different distances, the sizes of the two virtual images are also different. In a specific embodiment, the two virtual images of this embodiment are respectively at a relatively far position and a relatively near position, such as 10 meters and 3 meters. The far image B1 can display road surface information, and the near image B2 can display instrument information. It should be noted that the principle of being able to generate two virtual images at different positions here is that the distances of the first diffuser 21 and the second diffuser 22 from the mirror 30 are different, which is equivalent to setting different object distances, so the image distances will also be different. The image distance in this embodiment refers to the position of the virtual image, which can be the distance of the virtual image from the eyebox A, or the position of the virtual image from the reflection panel 40. By adjusting the optics 13 in the image display unit 10, clear imaging can be achieved at the position of the first diffuser 21 or the position of the second diffuser 22 in different demand scenarios.

[0059] In a specific embodiment, the first diffuser 21 is located below the second diffuser 22, and the top of the first diffuser 21 is flush with the bottom of the second diffuser 22.

[0060] With this design, the upper part of the light emitted from the image display unit 10 will pass through the second diffuser 22, and the lower part of the light emitted from the image display unit 10 will pass through the first diffuser 21. The top of the first diffuser 21 is flush with the bottom of the second diffuser 22 to prevent light from leaking between the first diffuser 21 and the second diffuser 22 and not playing an adjustment role, which may lead to poor image display quality of the image that has not passed through the first diffuser 21 or the second diffuser 22.

[0061] In some specific embodiments, the adjusting component 20 includes a plurality of diffuser sheets. The plurality of diffuser sheets are arranged at intervals along the propagation direction of light and are vertically offset. The light passes through the plurality of diffuser sheets and is incident on the reflector 30 respectively, so that the human eye can see virtual images equal in number to the number of diffuser sheets, and the positions of the virtual images are different. What this embodiment wants to illustrate is that the adjusting component 20 can not only include two diffuser sheets 23 as described in the above embodiment, but also include three, four or even more diffuser sheets. The diffuser sheets can be the first diffuser sheet 21, the second diffuser sheet 22, the third diffuser sheet 23, the fourth diffuser sheet 23, and so on. The light emitted from the image display unit 10 is incident on the diffuser sheets at different positions. After being finally received by the human eye, the human eye can see virtual images at different positions, and the number of these images is equal to the number of diffuser sheets. Therefore, those skilled in the art can limit the number and positions of the diffuser sheets according to the required number of virtual images. Here, the light passes through the plurality of diffuser sheets and is incident on the reflector 30 respectively, which means that the light is divided into multiple parts. For example, if there are three diffuser sheets, it is divided into three parts, and each part is incident on a corresponding diffuser sheet to form a virtual image at the corresponding position.

[0062] In the second embodiment, the adjusting component 20 includes at least the first diffuser sheet 21 and the second diffuser sheet 22. The first diffuser sheet 21 and the second diffuser sheet 22 are arranged at intervals along the propagation direction of light, and the first diffuser sheet 21 and the second diffuser sheet 22 are respectively installed in a telescopic manner so that one of the first diffuser sheet 21 and the second diffuser sheet 22 enters the optical path to adjust the position of the virtual image. In this embodiment, the first diffuser sheet 21 and the second diffuser sheet 22 are completely arranged along the propagation direction of light, and are arranged at intervals in the horizontal direction, that is, along the optical axis direction, and the diffuser sheets 23 are arranged side by side. In this embodiment, the first diffuser sheet 21 and the second diffuser sheet 22 are installed in a telescopic manner. The meaning of telescopic installation is that the first diffuser sheet 21 and the second diffuser sheet 22 can enter or leave the optical path under the drive of the outside world or the drive motor of themselves. The optical path refers to the propagation path of the light emitted from the image display unit 10. For example, the first diffuser sheet 21 entering the optical path means that the light emitted from the image display unit 10 will pass through the first diffuser sheet 21 and then be incident on the reflector 30. The first diffuser sheet 21 leaving the optical path means that the light emitted from the image display unit 10 will not pass through the first diffuser sheet 21. Further, a motor or a button installed on the housing of the image display unit 10 can be set to realize the movement of the first diffuser sheet 21 and the second diffuser. Generally speaking, one of the first diffuser sheet 21 and the second diffuser sheet 22 is in the optical path, and the other is outside the optical path.

[0063] Specifically, please refer to Figure 7, the first diffuser 21 is located to the left of the second diffuser 22. The second diffuser 22 is located between the first diffuser 21 and the mirror 30, that is, the first diffuser 21 is farther from the mirror 30 than the second diffuser 22. When the first diffuser 21 is inserted into the optical path and the second diffuser 22 is removed from the optical path, the light rays emitted from the image display unit 10 pass through the first diffuser 21, and after being reflected by the mirror 30 and the reflection panel 40 in sequence, the virtual image at B1 can be seen by the human eye. When the first diffuser 21 is removed from the optical path and the second diffuser 22 is inserted into the optical path, the light rays emitted from the image display unit 10 pass through the second diffuser 22, and after being reflected by the mirror 30 and the reflection panel 40 in sequence, the virtual image at B2 can be seen by the human eye. The positions of the virtual images at B1 and B2 are not the same. The virtual image at B1 is farther away and the image may also be larger. Therefore, in this embodiment, by controlling the first diffuser 21 or the second diffuser 22 at different positions to enter or leave the optical path, the adjustment of the position and size of the virtual image can be achieved to meet the needs of different people. Combining with the adjustment of the optical element 13 in the image display unit 10, clear imaging can be achieved when either the first diffuser 21 or the second diffuser 22 enters the optical path.

[0064] Referring to Figure 8 , in the third embodiment, the adjustment assembly 20 includes a driving member 25 and a diffuser 23 connected to the driving member 25. The driving member 25 is used to drive the diffuser 23 to move along the direction of light propagation to adjust the position of the virtual image. The driving member 25 can also be a driving motor, and the driving motor can be controlled to drive the diffuser 23 to move by buttons, gears or turntables provided on the housing of the adjustment assembly 20. Since the distance between the diffuser 23 and the mirror 30 is adjusted, which is equivalent to adjusting the object distance, the image distance will also change accordingly, realizing the adjustment of the position of the virtual image. Combining with the adjustment of the optical element 13 in the image display unit 10, clear imaging can be achieved at different positions of the diffuser 23. Moreover, in this embodiment, only one diffuser 23 can be used to adjust the image distance to different positions, that is Figure 8 the position of the virtual image B can be adjusted, reducing the usage cost of the diffuser 23.

[0065] According to another aspect of the present invention, the present invention also provides an automobile, which includes the above-mentioned head-up display device 100, and the reflection panel 40 is the windshield of the automobile. Of course, it can also be used in other application scenarios that require viewing real images and virtual images simultaneously. Since the automobile includes all the technical solutions of all the embodiments of the above-mentioned head-up display device 100, therefore, it has at least all the beneficial effects brought by the above-mentioned all technical solutions, which will not be elaborated here one by one.

[0066] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present application, and do not limit the patent scope of the present utility model; Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: Under the technical concept of the present utility model, it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features therein; Or directly / indirectly applied in other related technical fields, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A head-up display device, characterized in that: The device comprises an adjustment component, a reflector, a reflective panel and an image display unit, wherein the image display unit comprises an image source, a projection lens and an optical element, wherein the light emitted from the image source can pass through the optical element and then enter the projection lens, and the light emitted from the projection lens passes through the adjustment component and then enters the reflector, and the reflector reflects the light to the reflective panel, and the reflective panel reflects the received light and then enters the eye box; The adjustment component is used to adjust the light incident from the image display unit to the reflector to adjust the virtual image seen by the human eye; The optical element includes a liquid lens, and different depths of field imaging are achieved by controlling the thickness of the liquid lens; or, The optical element comprises a glass slide, which is movably mounted to cut into or out of the optical path; or, The optical element includes a plurality of glass slides, the thickness or refractive index of the plurality of glass slides is different, and the plurality of glass slides are movably installed to cut in or out of the optical path to achieve different depth of field imaging.

2. The head-up display device according to claim 1, characterized in that: The glass slide partially extends into the optical path, a portion of the light emitted from the image source passes through the glass slide and is incident on the projection lens, and another portion of the light is directly incident on the projection lens.

3. The head-up display device according to claim 2, characterized in that: The optical element further includes a reflector, and the light is reflected onto the projection lens after passing through the reflector.

4. The head-up display device according to claim 2, characterized in that: The glass slide partially extends into the light path; or, the glass slide fully extends into the light path.

5. The head-up display device according to claim 3, characterized in that: The reflector is a plane reflector or a prism.

6. The head-up display device according to claim 1, characterized in that: The adjustment component includes a first diffuser and a second diffuser, the first diffuser and the second diffuser are arranged at intervals along the propagation direction of the light, and the first diffuser and the second diffuser are arranged in a vertically staggered manner, a part of the light passes through the first diffuser and is incident on the reflector, and another part of the light passes through the second diffuser and is incident on the reflector, so that the human eye sees two virtual images at different positions.

7. The head-up display device according to claim 6, characterized in that: The first diffusion sheet is located below the second diffusion sheet, and the top of the first diffusion sheet is flush with the bottom of the second diffusion sheet.

8. The head-up display device according to claim 1, characterized in that: The adjustment component includes at least a first diffuser and a second diffuser, the first diffuser and the second diffuser are arranged at intervals along the propagation direction of the light, and the first diffuser and the second diffuser are respectively installed telescopically so that one of the first diffuser and the second diffuser enters the light path to adjust the position of the virtual image.

9. The head-up display device according to claim 1, characterized in that: The adjustment component includes a driving member and a diffusion sheet connected to the driving member, and the driving member is used to drive the diffusion sheet to move along the direction of light propagation to adjust the position of the virtual image.

10. An automobile, characterized in that: The automobile comprises the head-up display device according to any one of claims 1 to 9, and the reflective panel is a windshield of the automobile.

Images