Display device for vehicle

Abstract

The present disclosure relates to a display device for a vehicle. The display device for a vehicle according to an embodiment of the present disclosure may comprise: an image generation device for outputting a first polarized projection image; a concave mirror including a phase delay layer for polarization conversion between first polarized light and second polarized light; and a transparent cover including a polarized layer for transmitting the first polarized light and reflecting the second polarized light. The concave mirror may convert a first polarized projection image output from the image generation device into a second polarized projection image and may primarily reflect same to the transparent cover. The transparent cover may reflect the second polarized projection image to the concave mirror. The concave mirror may convert the second polarized projection image into the first polarized projection image and may secondarily reflect same to the transparent cover. The transparent cover may transmit the first polarized projection image. Accordingly, the size can be reduced while realizing a projection image on a large screen.

Description

Vehicle display device

[0001] The present disclosure relates to a vehicle display device, and more particularly, to a vehicle display device capable of reducing the size while implementing a large-screen projection image.

[0002] A vehicle is a device that allows the user to move in the desired direction. A representative example is an automobile.

[0003] Meanwhile, for the convenience of vehicle users, vehicle display devices are being installed inside vehicles.

[0004] For example, displays are placed in clusters and other areas to display various types of information. Meanwhile, vehicles are increasingly equipped with various displays, including AVN (Audio Video Navigation) displays and head-up displays that project images onto the windshield, separate from the cluster, to display driving information and other information.

[0005] Meanwhile, the amount of information displayed through head-up displays is increasing. For example, implementing an AR-based head-up display requires displaying information about roads, cars, surrounding objects, and more, necessitating a larger screen size.

[0006] As the size of the head-up display increases, there are problems with installation inside the vehicle.

[0007] The present disclosure is proposed to solve the aforementioned problems, and aims to provide a vehicle display device that is small enough to be easily installed inside a vehicle, while still having a sufficient optical path to realize a large-screen projection image.

[0008] In order to achieve the above object, according to one aspect of the present disclosure, a vehicle display device can be provided, including an image generating device that outputs a first polarization projection image, a concave mirror including a phase delay layer for polarization conversion between the first polarization and the second polarization, and a transparent cover including a polarization layer for transmitting the first polarization and reflecting the second polarization, wherein the concave mirror converts the first polarization projection image output from the image generating device into a second polarization projection image and primarily reflects the image onto the transparent cover, the transparent cover reflects the second polarization projection image onto the concave mirror, the concave mirror converts the second polarization projection image into a first polarization projection image and secondarily reflects the image onto the transparent cover, and the transparent cover transmits the first polarization projection image.

[0009] The above vehicle display device may further include a motor for adjusting the position of the first polarized projection image passing through the transparent cover.

[0010] The primary mirror reflection area of ​​the above concave mirror may be located further forward of the vehicle than the secondary mirror reflection area of ​​the above concave mirror.

[0011] The above primary mirror reflection area may be narrower than the above secondary mirror reflection area.

[0012] The cover reflective area of ​​the above transparent cover may be positioned further forward of the vehicle than the cover transparent area of ​​the above transparent cover.

[0013] The above cover reflection area may be narrower than the above cover transmission area.

[0014] The first polarization may be P polarization, and the second polarization may be S polarization.

[0015] The image generating device may include one of an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diodes), a digital mirror device, and a micro LED (Light Emitting Diodes).

[0016] The above phase delay layer may include a 1 / 4 wavelength conversion plate.

[0017] The first optical path from the concave mirror to the transparent cover of the second polarized projection image reflected first may be shorter than the second optical path from the transparent cover to the concave mirror of the second polarized projection image reflected by the transparent cover.

[0018] The second optical path may be shorter than the third optical path from the concave mirror of the second reflected first polarization projection image to the transparent cover.

[0019] The second polarized projection image passing through the above transparent cover can be projected onto the windshield of the vehicle.

[0020] The above vehicle display device may include a HUD (Head Up Display).

[0021] The effects of the vehicle display device according to the present disclosure are described as follows.

[0022] According to at least one aspect of the present disclosure, the vehicle display device has the advantage of being small enough to be easily mounted inside a vehicle while still having a sufficient optical path to realize a large-screen projection image.

[0023] Figure 1 is a drawing showing an example of the exterior and interior of a vehicle.

[0024] FIGS. 2 and 3 are drawings showing various examples of the internal configuration of a vehicle display device related to the present disclosure.

[0025] FIG. 4 is a drawing showing an example of the internal configuration of a vehicle display device according to one aspect of the present disclosure.

[0026] Fig. 5 is an enlarged cross-sectional view of a concave mirror of the vehicle display device of Fig. 4.

[0027] Fig. 6 illustrates the optical path and variable conversion of the projection image in the vehicle display device of Fig. 4.

[0028] FIG. 7 is a drawing for explaining the reflection area and the transmission area in the vehicle display device of FIG. 4.

[0029] FIG. 8 is a drawing for explaining the optical path of the projection image of the vehicle display device of FIG. 4.

[0030] FIG. 9 is a drawing for comparing the sizes between the vehicle display device of FIG. 3 and the vehicle display device of FIG. 4.

[0031] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be given the same reference numbers, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably only for the convenience of writing the specification, and do not in themselves have distinct meanings or roles. In addition, when describing the embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, a detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0032] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0033] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0034] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0035] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0036] Hereinafter, with reference to Fig. 1, we will look at an example of the exterior and interior of a vehicle. Fig. 1 is a drawing illustrating an example of the exterior and interior of a vehicle.

[0037] As illustrated in FIG. 1, the vehicle (200) can be operated by a plurality of wheels (103FR, 103FL, 103RL, etc.) that rotate by a power source and a steering wheel (150) for controlling the direction of travel of the vehicle (200).

[0038] The vehicle (200) may further be equipped with a camera (195) for capturing images of the front of the vehicle.

[0039] The vehicle (200) may be equipped with multiple displays (180a, 180b, 180h) for displaying images, information, etc. inside.

[0040] For example, among the plurality of displays (180a, 180b, 180h), the first display (180a) may be a cluster display, the second display (180b) may be an AVN (Audio Video Navigation) display, and the third display (180h) may be a Head Up Display (HUD) that projects an image onto a predetermined area (Ara) of a windshield (WS). The predetermined area (Ara) may correspond to the eye area (Eye Box) of a user (or driver).

[0041] Meanwhile, the vehicle display device of the present disclosure is a device for HUD (180h).

[0042] Meanwhile, a black masking area or frit area (Fz) may be formed in the lower area of ​​the windshield (WS), as shown in the drawing.

[0043] Meanwhile, the vehicle (200) described in this specification may be a concept that includes all of a vehicle equipped with an engine as a power source, a hybrid vehicle equipped with an engine and an electric motor as a power source, and an electric vehicle equipped with an electric motor as a power source.

[0044] Hereinafter, with reference to FIGS. 2 and 3, the internal configuration of a vehicle display device related to the present disclosure will be examined. FIGS. 2 and 3 are drawings illustrating various examples of the internal configuration of a vehicle display device related to the present disclosure.

[0045] FIG. 2 illustrates an example of a vehicle display device related to the present disclosure.

[0046] Referring to FIG. 2, a vehicle display device (100x) related to the present disclosure includes a liquid crystal display panel (or picture generation unit (PGU)) (300x) that outputs a projected image, a fold mirror (315x) that reflects the projected image from the liquid crystal display panel (300x), and a concave mirror (325x) that reflects the projected image from the fold mirror (315x) to a windshield (WS).

[0047] The projection image reflected from a predetermined area (Arx) of the windshield (WS) is output to the driver's field of vision (Ara).

[0048] A concave mirror (325x) within a vehicle display device (100x) is positioned between a liquid crystal display panel (300x) and a driver's viewing area (Ara). That is, the concave mirror (325x) may be positioned within two imaginary parallel lines passing through the liquid crystal display panel (300x) and the driver's viewing area (Ara) at a distance corresponding to the distance between the liquid crystal display panel (300x) and the driver's viewing area (Ara).

[0049] Meanwhile, the concave mirror (325x) within the vehicle display device (100x) determines the arrangement of the projected image and the position of the light source.

[0050] For example, by increasing the magnification of the concave mirror (325x) in the vehicle display device (100x) and reducing the focal length, the size (SZx) of the vehicle display device (100x) can be reduced.

[0051] However, when reducing the size in this way, it becomes difficult to implement a large-screen projection image, which has the disadvantage of making it difficult to implement an AR HUD.

[0052] FIG. 3 illustrates another example of a vehicle display device related to the present disclosure.

[0053] Referring to FIG. 3, a vehicle display device (100y) related to the present disclosure includes a liquid crystal display panel (300y) that outputs a projected image, a fold mirror (315y) that reflects the projected image from the liquid crystal display panel (300y), a concave mirror (325y) that reflects the projected image from the fold mirror (315y), and a transparent cover (335y) that outputs the projected image from the concave mirror (325y) to a windshield (WS).

[0054] The projection image reflected from a predetermined area (Ary) of the windshield (WS) is output to the driver's field of vision area (Ara).

[0055] Unlike in FIG. 2, the concave mirror (325y) in the vehicle display device (100y) is placed in front of the liquid crystal display panel (300y) and the driver's viewing area (Ara).

[0056] That is, the liquid crystal display panel (300y) within the vehicle display device (100y) is positioned between the concave mirror (325y) and the driver's line of sight area (Ara). That is, the liquid crystal display panel (300y) may be positioned within two virtual parallel lines passing through the concave mirror (325y) and the driver's line of sight area (Ara) respectively, with a gap corresponding to the distance between the concave mirror (325y) and the driver's line of sight area (Ara).

[0057] Meanwhile, the concave mirror (325y) within the vehicle display device (100y) determines the arrangement of the projected image and the position of the light source.

[0058] For example, by increasing the magnification of the concave mirror (325y) in the vehicle display device (100y) and reducing the focal length, the size (SZy) of the vehicle display device (100y) can be reduced.

[0059] However, when reducing the size in this way, it becomes difficult to implement a large-screen projection image, which has the disadvantage of making it difficult to implement an AR HUD.

[0060] Accordingly, in this disclosure, a method for reducing the size of a vehicle display device while implementing a large-screen projection image is proposed.

[0061] In particular, unlike FIGS. 2 and 3, a vehicle display device (100) utilizing two reflections in a concave mirror is proposed. This is described with reference to FIG. 4.

[0062] FIG. 4 is a drawing showing an example of the internal configuration of a vehicle display device according to one aspect of the present disclosure.

[0063] Referring to FIG. 4, a vehicle display device (100) according to one aspect of the present disclosure may include an image generating device (300) that outputs a projected image, a concave mirror (325) that reflects the projected image, and a transparent cover (335) that transmits or re-reflects the projected image reflected from the concave mirror (325). The vehicle display device (100) may further include a motor (327) that adjusts the inclination of the concave mirror (325) to adjust the position of the projected image projected on the windshield to match the eye level of a user (or driver).

[0064] The image generating device (300) can output a projection image polarized in a specific direction. Hereinafter, the projection image output by the image generating device (300) will be referred to as a first polarization projection image. The first polarization may be linear polarization, for example, P polarization. The image generating device (300) may include at least one of an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diodes), a digital mirror device, a micro LED (Light Emitting Diodes), etc.

[0065] The above concave mirror (325) may be arranged so as to lie down close to the longitudinal direction (X direction) of the vehicle. A phase delay layer may be formed on the concave mirror (325) to polarize-convert a first polarized projection image into a second polarized projection image, and the second polarized projection image into the first polarized projection image. The second polarization may be linear polarization, for example, S polarization. The installation angle (α) of the concave mirror (325) with respect to the longitudinal direction (X direction) of the vehicle may be 90 degrees or more (for example, 90 degrees + θ).

[0066] The above phase delay layer may be composed of a quarter wave plate (QWP). The role of the phase delay layer will be further described with reference to FIG. 5. FIG. 5 is an enlarged cross-sectional view of the concave mirror of the vehicle display device of FIG. 4.

[0067] As illustrated in (5-1) of FIG. 5, the first linearly polarized light (e.g., P polarized light) irradiated to the phase delay layer (325L) is converted into the first circularly polarized light (e.g., right-handed circularly polarized light) while passing through the phase delay layer (325L), and the first circularly polarized light is converted into the second circularly polarized light (e.g., left-handed circularly polarized light) while being reflected by the reflection layer (or reflection surface) (325R) of the concave mirror (325), and the reflected second circularly polarized light can be converted into the second linearly polarized light (e.g., S polarized light) while passing through the phase delay layer (325L).

[0068] Meanwhile, as illustrated in (5-2) of FIG. 5, the second linearly polarized light (e.g., S polarized light) irradiated to the phase delay layer (325L) is converted into the second circularly polarized light (e.g., left-handed circularly polarized light) while passing through the phase delay layer (325L), and the second circularly polarized light is converted into the first circularly polarized light (e.g., right-handed circularly polarized light) while being reflected by the reflection layer of the concave mirror (325), and the reflected first circularly polarized light can be converted into the first linearly polarized light (e.g., P polarized light) while passing through the phase delay layer again.

[0069] Returning to FIG. 4, the transparent cover (335) may function as a dust cover to prevent foreign substances from entering. The transparent cover (335) may be configured as a flat or curved surface depending on the characteristics of the windshield and the vehicle. A polarizing layer may be formed on the transparent cover (335) to transmit the first polarized light while reflecting the second polarized light. That is, the polarizing layer may be a mirror-type polarizing layer that reflects the second polarized light rather than absorbing it.

[0070] The optical path of the projection image passing through the concave mirror (325) and the transparent cover (335) and the polarization conversion of the projection image will be further described with reference to Fig. 6. Fig. 6 illustrates the optical path and polarization conversion of the projection image in the vehicle display device of Fig. 4.

[0071] As illustrated in FIG. 6, a first polarized projection image (e.g., P polarized image) output from the image generating device (300) may be reflected onto the transparent cover (335) while being converted into a second polarized projection image (e.g., S polarized image) by the concave mirror (325). The conversion of the first polarized projection image into the second polarized projection image by the concave mirror (325) is as described above with reference to FIG. 5. The optical path of the second polarized projection image, which is first reflected by the concave mirror (325), from the concave mirror (325) to the transparent cover (335) will be referred to as a first optical path (R1).

[0072] The second polarized projection image reflected by the transparent cover (335) can be reflected back to the concave mirror (325) by the polarizing layer of the transparent cover (335). As described above, the polarizing layer of the transparent cover (335) can reflect the second polarized light. The optical path of the second polarized projection image reflected by the transparent cover (335) from the transparent cover (335) to the concave mirror (325) will be referred to as the second optical path (R2).

[0073] The second polarization projection image reflected by the polarization layer can be reflected back to the transparent cover (335) while being converted into a first polarization projection image (e.g., a P polarization image) by the concave mirror (325). The conversion of the second polarization projection image into the first polarization projection image by the concave mirror (325) is as described above with reference to FIG. 5. The optical path of the first polarization projection image secondarily reflected by the concave mirror (325) from the concave mirror (325) to the transparent cover (335) will be referred to as a third optical path (R3).

[0074] The first polarized projection image reflected back to the transparent cover (335) can transmit the polarizing layer of the transparent cover (335). As described above, the polarizing layer of the transparent cover (335) can transmit the first polarized light.

[0075] Comparing the first optical path (R1), the second optical path (R2), and the third optical path (R3), the second optical path (R2) may be longer than the first optical path (R1), and the third optical path (R3) may be longer than the second optical path (R2).

[0076] Returning to FIG. 4 again, the transmitted first polarization projection image is reflected from the predetermined area (Arz) of the windshield (WS) and output to the driver's viewing area (Ara).

[0077] As described above, since the concave mirror (325) is disposed to lie down considerably in the horizontal longitudinal direction (X direction) of the vehicle, even if a relatively large concave lens (325) is provided in the vehicle display device (100), the vertical size of the vehicle display device (100) may not be significantly affected. In addition, since the vehicle display device (100) is configured so that the projection image output from the image generating device (300) is reflected twice by the concave mirror (325) and output to the windshield (WS), a sufficiently long optical path for the projection image can be secured. As the sufficiently long optical path can be secured, the vehicle display device (100) can be configured to have a smaller size.

[0078] In the vehicle display device (100) according to FIG. 4, the area where the projection image is first reflected by the concave mirror (325) (hereinafter, “first mirror reflection area”) and the area where the projection image is secondarily reflected (hereinafter, “second mirror reflection area”), and the area where the projection image is reflected by the transparent cover (i.e., dust cover) (335) (hereinafter, “cover reflection area”) and the area where the projection image is transmitted (hereinafter, “cover transmission area”) will be further described with reference to FIG. 7. FIG. 7 is a drawing for explaining the reflection area and the transmission area in the vehicle display device of FIG. 4.

[0079] As illustrated in Fig. 7, the projection image output from the image generating device (300) can be reflected by the primary mirror reflection area (325-1) of the concave mirror (325) toward the transparent cover (335). The primary mirror reflection area (325-1) may be an area biased toward the front of the vehicle among the entire area of ​​the concave mirror (325). The projection image reflected by the primary mirror reflection area may be directed toward the transparent cover (335).

[0080] The projection image directed toward the transparent cover (335) may be reflected toward the concave mirror (325) by the cover reflection area (335-1) of the transparent cover (335). The cover reflection area (335-1) may be an area biased toward the front of the vehicle among the entire area of ​​the transparent cover (335). The projection image reflected by the cover reflection area (335-1) may be directed toward the concave mirror (325).

[0081] The projection image directed toward the concave cover (325) may be reflected to the transparent cover (335) by the secondary mirror reflection area (325-2) of the concave mirror (325). The secondary mirror reflection area (325-2) may be an area that is biased toward the rear of the vehicle among the entire area of ​​the concave mirror (325). The secondary mirror reflection area (325-2) may partially overlap with the primary mirror reflection area (325-1). The secondary mirror reflection area (325-2) may be wider than the primary mirror reflection area (325-1). Depending on the design, the secondary mirror reflection area (325-2) may completely include the primary mirror reflection area (325-1).

[0082] The projection image directed toward the transparent cover (335) can pass through the cover penetration area (335-2) of the transparent cover (335). The cover penetration area (335-2) may be a region that is tilted toward the rear of the vehicle among the entire region of the transparent cover (335). The cover penetration area (335-2) may partially overlap with the cover reflection area (335-1). The cover penetration area (335-2) may be wider than the cover reflection area (335-1). Depending on the design, the cover penetration area (335-2) may completely include the cover reflection area (335-1).

[0083] As described above, the above-mentioned transmitted projection image is reflected from the predetermined area (Arz) of the windshield (WS) and output to the driver's viewing area (Ara).

[0084] Hereinafter, with reference to FIG. 8, the optical path of the projection image of the vehicle display device of FIG. 4 will be described. FIG. 8 is a drawing for explaining the optical path of the projection image of the vehicle display device of FIG. 4.

[0085] The projection image output from the image generating device (300) can be primarily reflected by the concave mirror (325) and the transparent cover (335).

[0086] The above first reflected projection image can be reflected to the concave mirror (325) by the transparent cover (335).

[0087] The projection image directed toward the concave cover (325) can be secondarily reflected by the concave mirror (325) to the transparent cover (335).

[0088] The above secondary reflected projection image can pass through the transparent cover (335).

[0089] The above-mentioned transmitted projection image can be reflected from the predetermined area (Arz) of the windshield (WS) and output to the driver's viewing area (Ara).

[0090] Therefore, the projection image may appear as an illusion to the driver on the opposite side of the windshield (WS) (i.e., the outside of the windshield (WS)).

[0091] Hereinafter, with reference to FIG. 9, the sizes of the vehicle display device (100y) according to FIG. 3 and the vehicle display device (100) according to FIG. 3 will be compared. FIG. 9 is a drawing for comparing the sizes of the vehicle display device of FIG. 3 and the vehicle display device of FIG. 4.

[0092] Fig. 9 (9-1) shows a partial cross-sectional view of the vehicle (200) equipped with the vehicle display device (100y) according to Fig. 3. Fig. 9 (9-2) shows a partial cross-sectional view of the vehicle (200) equipped with the vehicle display device (100) according to Fig. 4.

[0093] As illustrated in FIG. 9, the vehicle display device (100, 100y) mounted on the vehicle may be adjacent to a brake structure (210), a steering wheel structure (220), and a HUD frame (230).

[0094] It can be seen that the vehicle display device (100) according to FIG. 4 is smaller in size than the vehicle display device (100y) according to FIG. 3, and thus the volume it occupies can be significantly reduced. That is, as illustrated in (9-2) of FIG. 9, the volume can be reduced by the area (S) indicated by hatching. This is because, as described above, the concave mirror (325) is not only arranged to lie down close to the longitudinal direction (X direction) of the vehicle, but also the vehicle display device (100) is configured so that the projection image is reflected twice on the concave mirror (325) and the flat mirror (315y) is not required. For this reason, the vehicle display device (100) according to FIG. 4 is, of course, smaller in size than the vehicle display device (100X) according to FIG. 2.

[0095] Meanwhile, a heat-blocking film may be applied to the front end of the image generating device, the concave mirror, or the dust cover to prevent damage from sunlight. Furthermore, the position of each optical component may be changed depending on the vehicle's windshield (WS) and the mounting space of the vehicle display device, and the virtual image distance and field of view (FOV) may also vary as required.

[0096] The above detailed description should not be construed as limiting in any respect and should be considered illustrative only. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are intended to be included within the scope of the present invention.

Claims

1. An image generating device that outputs a first polarization projection image; A concave mirror including a phase delay layer for polarization conversion between a first polarization and a second polarization; and A transparent cover comprising a polarizing layer for transmitting a first polarization and reflecting a second polarization; The above concave mirror converts the first polarized projection image output from the image generating device into a second polarized projection image and reflects it primarily onto the transparent cover, The above transparent cover reflects the second polarized projection image to the above concave mirror, The above concave mirror converts the second polarization projection image into a first polarization projection image and reflects it secondarily onto the transparent cover. A vehicle display device, wherein the above transparent cover transmits a first polarized projection image.

2. In paragraph 1, A vehicle display device further comprising a motor for adjusting the position of a first polarized projection image passing through the transparent cover.

3. In paragraph 1, A vehicle display device, characterized in that the primary mirror reflection area of ​​the concave mirror is located further forward of the vehicle than the secondary mirror reflection area of ​​the concave mirror.

4. In paragraph 3, A vehicle display device characterized in that the primary mirror reflection area is narrower than the secondary mirror reflection area.

5. In paragraph 1, A vehicle display device characterized in that the cover reflection area of ​​the transparent cover is located in the forward direction of the vehicle compared to the cover transmission area of ​​the transparent cover.

6. In paragraph 5, A vehicle display device, characterized in that the cover reflection area is narrower than the cover transmission area.

7. In paragraph 1, A vehicle display device characterized in that the first polarization is P polarization and the second polarization is S polarization.

8. In paragraph 1, A vehicle display device characterized in that the image generating device includes one of an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diodes), a digital mirror device, and a micro LED (Light Emitting Diodes).

9. In paragraph 1, A vehicle display device, characterized in that the phase delay layer includes a 1 / 4 wavelength conversion plate.

10. In paragraph 1, A vehicle display device, characterized in that the first optical path from the concave mirror to the transparent cover of the second polarized projection image reflected first is shorter than the second optical path from the transparent cover to the concave mirror of the second polarized projection image reflected by the transparent cover.

11. In paragraph 10, A vehicle display device, characterized in that the second optical path is shorter than the third optical path from the concave mirror of the second reflected first polarized projection image to the transparent cover.

12. In paragraph 1, A vehicle display device characterized in that the second polarized projection image passing through the transparent cover is projected onto the windshield of the vehicle.

13. In paragraph 1, A vehicle display device characterized in that the vehicle display device includes a HUD (Head Up Display).

Images