Display device for vehicle

Abstract

The invention relates to a display device for a vehicle. A display device for a vehicle according to an embodiment of the present disclosure includes: an image generation device that outputs a light projection image toward a windshield; and a mirror that reflects a projection image reflected from a first region of the windshield toward the windshield, and the projection image from the mirror is reflected from a second region of the windshield and output to a third region. Therefore, the size can be reduced while the image is projected on a large screen.

Description

Technical Field

[0001] The present disclosure relates to a vehicle display device, and more particularly, to a vehicle display device capable of realizing a projected image on a large screen while reducing the size of the vehicle display device. Background Art

[0002] A vehicle is a device that moves in a direction desired by a user riding therein. A representative example is an automobile.

[0003] In addition, in order to facilitate the use of the vehicle by the user, a vehicle display device is installed inside the vehicle.

[0004] For example, a display is placed on an instrument cluster or the like to display various types of information. At the same time, in order to separately display vehicle driving information and the like from the instrument cluster, various displays have been installed in the vehicle, such as an audio video navigation (AVN) display and a head-up display configured to output a projected image on a windshield.

[0005] In addition, the information displayed by the head-up display is increasing. For example, in order to implement an augmented reality-based head-up display, information about roads, cars, and surrounding objects in the street must be displayed, so the screen of the head-up display must be larger, and ultimately, the size of the head-up display must be increased.

[0006] In addition, Japanese Registered Patent Publication No. 4474711, which is Prior Art Document 1, relates to a head-up display and discloses a HUD optical structure.

[0007] In addition, Prior Art Document 2 - U.S. Patent Publication No. US20120224062 - relates to a head-up display and discloses a HUD optical structure.

[0008] However, according to Prior Art Documents 1 and 2, since the optical path after the concave mirror must be configured inside the head-up display, there is a disadvantage that in order to implement an augmented reality-based head-up display, the size of the head-up display must be increased.

[0009] In addition, if the size of the head-up display is increased, there is a problem that its installation inside the vehicle is restricted. Summary of the Invention

[0010] Technical Problem

[0011] The problem of the present disclosure is to provide a vehicle display device capable of realizing a projected image on a large screen while reducing the size of the vehicle display device.

[0012] In addition, another problem of the present disclosure is to provide a vehicle display device capable of reducing the size while ensuring the optical path.

[0013] Means for solving the problem

[0014] According to an embodiment of the present disclosure, there is provided a vehicle display device, the display device including: an image generation device configured to output a projection image toward a windshield; and a mirror configured to reflect the projection image reflected from a first area of the windshield back toward the windshield, wherein the projection image from the mirror is reflected from a second area of the windshield and output to a third area.

[0015] Furthermore, the second area of the windshield is closer to the third area than the first area of the windshield.

[0016] Furthermore, the incident angle of the projection image incident on the first area of the windshield is greater than the incident angle of the projection image incident on the second area of the windshield.

[0017] Furthermore, the image generation device is closer to the third area than the mirror.

[0018] Furthermore, the position of the image generation device is set at a position higher than the position of the mirror.

[0019] Furthermore, the mirror is closer to the third area than the image generation device.

[0020] Furthermore, the position of the mirror can be set at a position higher than the position of the image generation device.

[0021] Furthermore, the vehicle display device according to an embodiment of the present disclosure further includes a transparent cover disposed between the image generation device and the windshield.

[0022] Furthermore, the image generation device includes a digital micromirror device or a liquid crystal display panel.

[0023] Furthermore, in the windshield, the reflectance of S-polarized light can be greater than the reflectance of P-polarized light.

[0024] Furthermore, the image generation device is configured to output a projection image to the first area of the windshield attached with a P-polarized light reflecting film, wherein the mirror is configured to reflect the projection image to the second area of the windshield attached with the P-polarized light reflecting film.

[0025] Furthermore, the first area of the windshield corresponds to a black masking area or a frit area.

[0026] In addition, the vehicle display device according to an embodiment of the present disclosure further includes: a transparent cover disposed between the image generation device and the windshield; and a phase retardation film attached to the transparent cover, wherein the image generation device includes a liquid crystal display panel, wherein the liquid crystal display panel is configured to output a projection image of P-polarized light, wherein the transparent cover is configured to output a projection image of right-handed circularly polarized light to the first region of the windshield based on the projection image of P-polarized light, wherein the mirror outputs a projection image of S-polarized light based on the projection image of left-handed circularly polarized light from the first region of the windshield, and wherein the transparent cover is configured to output a projection image of left-handed circularly polarized light to the second region of the windshield based on the projection image of S-polarized light.

[0027] In addition, the vehicle display device according to an embodiment of the present disclosure further includes a transparent cover disposed between the image generation device and the windshield, wherein a phase retardation film is attached to the first region of the windshield, wherein the image generation device includes a liquid crystal display panel, wherein the liquid crystal display panel is configured to output a projection image of P-polarized light, wherein the mirror reflects the projection image of S-polarized light from the first region of the windshield, and wherein the transparent cover is configured to output the projection image of S-polarized light to the second region of the windshield.

[0028] In addition, the mirror includes: a base; and a mirror coating member formed on the base.

[0029] In addition, the mirror includes: a base; an optical adhesive film formed on the base; and a reflective film on the optical adhesive film.

[0030] On the other hand, the optical path before the first reflection of the projection image output from the image generation device is longer than the optical path from after the first reflection to before the second reflection.

[0031] According to another embodiment of the present disclosure, there is provided a vehicle display device, the display device including: an image generation device configured to output a projection image toward a windshield; and a mirror configured to reflect the projection image first reflected from the windshield back toward the windshield, wherein the projection image from the mirror is second reflected from the windshield, and wherein the optical path before the first reflection of the projection image output from the image generation device is longer than the optical path from after the first reflection to before the second reflection.

[0032] Public effect

[0033] According to an embodiment of the present disclosure, there is provided a display device for a vehicle, the display device including: an image generation device configured to output a projection image toward a windshield; and a mirror configured to reflect the projection image reflected from a first region of the windshield back toward the windshield, wherein the projection image from the mirror is reflected from a second region of the windshield and output to a third region. Thereby, a projection image can be realized on a large screen while reducing the size of the display device for a vehicle. In particular, the size can be reduced while ensuring the optical path.

[0034] In addition, the second region of the windshield is closer to the third region than the first region of the windshield. Thereby, a projection image can be realized on a large screen while reducing the size of the display device for a vehicle.

[0035] In addition, the incident angle of the projection image incident on the first region of the windshield is greater than the incident angle of the projection image incident on the second region of the windshield. Thereby, a projection image can be realized on a large screen while reducing the size of the display device for a vehicle.

[0036] In addition, the image generation device is closer to the third region than the mirror. Thereby, a projection image can be realized on a large screen while reducing the size of the display device for a vehicle.

[0037] In addition, the position of the image generation device is set at a position higher than the position of the mirror. Thereby, a projection image can be realized on a large screen while reducing the size of the display device for a vehicle.

[0038] In addition, the mirror is closer to the third region than the image generation device. Thereby, a projection image can be realized on a large screen while reducing the size of the display device for a vehicle.

[0039] In addition, the position of the mirror can be set at a position higher than the position of the image generation device. Thereby, a projection image can be realized on a large screen while reducing the size of the display device for a vehicle.

[0040] In addition, the display device for a vehicle according to an embodiment of the present disclosure further includes a transparent cover disposed between the image generation device and the windshield. Thereby, the interior of the image generation device can be protected while the projection image is output to the outside of the image generation device.

[0041] In addition, the image generation device includes a digital micromirror device or a liquid crystal display panel. Thereby, the projection image can be output to the outside of the image generation device.

[0042] In addition, in the windshield, the reflectance of S-polarized light may be greater than the reflectance of P-polarized light. Thus, the brightness of the projected image based on S-polarized light can be higher.

[0043] In addition, the image generation device is configured to output a projected image to the first region of the windshield to which the P-polarized light reflecting film is attached, and the reflector is configured to reflect the projected image to the second region of the windshield to which the P-polarized light reflecting film is attached. Thus, a projected image can be realized on a large screen while reducing the size of the vehicle display device.

[0044] In addition, the first region of the windshield corresponds to a black masking region or a frit region. Thus, the brightness of the projected image can be increased.

[0045] In addition, the vehicle display device according to an embodiment of the present disclosure further includes: a transparent cover disposed between the image generation device and the windshield; and a phase retardation film attached to the transparent cover, wherein the image generation device includes a liquid crystal display panel, wherein the liquid crystal display panel is configured to output a projected image of P-polarized light, wherein the transparent cover is configured to output a projected image of right-handed circularly polarized light to the first region of the windshield based on the projected image of P-polarized light, wherein the reflector outputs a projected image of S-polarized light based on the projected image of left-handed circularly polarized light from the first region of the windshield, and wherein the transparent cover is configured to output a projected image of left-handed circularly polarized light to the second region of the windshield based on the projected image of S-polarized light. Thus, a projected image of left-handed circularly polarized light can be realized on a large screen while reducing the size of the vehicle display device.

[0046] In addition, the vehicle display device according to an embodiment of the present disclosure further includes a transparent cover disposed between the image generation device and the windshield, wherein a phase retardation film is attached to the first region of the windshield, wherein the image generation device includes a liquid crystal display panel, wherein the liquid crystal display panel is configured to output a projected image of P-polarized light, wherein the reflector reflects the projected image of S-polarized light from the first region of the windshield, and wherein the transparent cover is configured to output the projected image of S-polarized light to the second region of the windshield. Thus, a projected image of S-polarized light can be realized on a large screen while reducing the size of the vehicle display device.

[0047] In addition, the reflector includes: a base; and a mirror coating member formed on the base. Thus, the reflectance of the reflector can be increased.

[0048] In addition, the mirror includes: a base; an optical adhesive film formed on the base; and a reflective film on the optical adhesive film. Thereby, the reflectivity of the mirror can be improved.

[0049] On the other hand, the optical path before the first reflection of the projected image output from the image generating device is longer than the optical path from after the first reflection to before the second reflection. Thereby, while realizing the projected image on a large screen, the size of the vehicle display device can be reduced.

[0050] According to another embodiment of the present disclosure, there is provided a vehicle display device, the display device including: an image generating device configured to output a projected image toward a windshield; and a mirror configured to reflect the projected image first reflected from the windshield back toward the windshield, wherein the projected image from the mirror is second reflected from the windshield, and wherein the optical path before the first reflection of the projected image output from the image generating device is longer than the optical path from after the first reflection to before the second reflection. Thereby, while realizing the projected image on a large screen, the size of the vehicle display device can be reduced. In particular, the size can be reduced while ensuring the optical path. Description of the Drawings

[0051] Figure 1 is a diagram showing examples of the exterior and interior of a vehicle.

[0052] Figure 2a and Figure 2b is a diagram showing various examples of the internal structure of the vehicle display device according to the present disclosure.

[0053] Figure 3 is a diagram showing an example of the internal structure of the vehicle display device according to an embodiment of the present disclosure.

[0054] Figure 4 is for explaining Figure 3 of.

[0055] Figure 5 is a diagram showing an example of the internal structure of the vehicle display device according to another embodiment of the present disclosure.

[0056] Figure 6 is a diagram showing an example of the internal structure of the vehicle display device according to another embodiment of the present disclosure.

[0057] Figure 7 is a diagram showing an example of the internal structure of the vehicle display device according to another embodiment of the present disclosure.

[0058] Figure 8a and Figure 8bis a diagram showing Figures 3 to 7 various examples of mirrors.

[0059] Figures 9a to 10b is a diagram for explaining Figures 3 to 7 of. Detailed Description

[0060] Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings.

[0061] In the following description, the suffixes "module" and "section" for components are only intended to facilitate the description of this specification, and the suffixes do not have any special meaning or function. Therefore, "module" and "section" can be used interchangeably.

[0062] Figure 1 is a diagram showing examples of the exterior and interior of a vehicle.

[0063] Referring to this diagram, the vehicle 200 is operated by a plurality of wheels 103FR, 103FL, 103RL... rotated by a power source and a steering wheel 150 for controlling the moving direction of the vehicle 200.

[0064] In addition, the vehicle 200 may further include a camera 195 for obtaining an image in front of the vehicle.

[0065] In addition, the vehicle 200 may include a plurality of displays 180a, 180b, 180h provided therein, and these displays display images, information, etc.

[0066] For example, among the plurality of displays 180a, 180b, 180h, the first display 180a may be a combination meter display, the second display 180b may be an audio video navigation (AVN) display, and the third display 180h may be a HUD display, which is a head-up display (HUD) that projects an image onto a certain separate area Ara on the windshield WS.

[0067] In addition, a vehicle display device according to an embodiment of the present disclosure ( Figure 3 100 of) is a device for the HUD display 180h.

[0068] In addition, as shown in this diagram, a black masking area or a frit area Fz may be formed in the lower region of the windshield WS.

[0069] In addition, the vehicle 200 described in this specification may be a general concept including a vehicle equipped with an engine as a power source, a hybrid vehicle equipped with an engine and an electric motor as power sources, and an electric vehicle equipped with an electric motor as a power source.

[0070] Figures 2a to 2bThis is a diagram showing various examples of the internal structure of a vehicle display device according to the present disclosure.

[0071] Figure 2a An example of a vehicle display device according to the present disclosure is shown.

[0072] Referring to this diagram, the vehicle display device 100x according to the present disclosure includes: a liquid crystal display panel 300x configured to output a projection image; a folding mirror 315x configured to reflect the projection image from the liquid crystal display panel 300x; and a concave mirror 325x configured to reflect the projection image from the folding mirror 315x onto the windshield WS.

[0073] The projection image reflected from a certain area Arx of the windshield WS is output to the driver's viewing area Ara.

[0074] The concave mirror 325x in the vehicle display device 100x is disposed between the liquid crystal display panel 300x and the driver's viewing area Ara.

[0075] In addition, the concave mirror 325x in the vehicle display device 100x determines the layout of the projection image and the position of the light source.

[0076] 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.

[0077] However, when the size is reduced in this way, it is difficult to achieve a projection image on a large screen, which includes the drawback of being difficult to implement an AR HUD.

[0078] Figure 2b Another example of a vehicle display device according to the present disclosure is shown.

[0079] Referring to this diagram, the vehicle display device 100y according to the present disclosure includes: a liquid crystal display panel 300y configured to output a projection image; a folding mirror 315y configured to reflect the projection image from the liquid crystal display panel 300y; a concave mirror 325y configured to reflect the projection image from the folding mirror 315y; and a transparent cover 335y configured to output the projection image from the concave mirror 325y to the windshield WS.

[0080] The projection image reflected from a certain area Ary of the windshield WS is output to the driver's viewing area Ara.

[0081] Unlike Figure 2a the concave mirror 325y in the vehicle display device 100y is disposed in front of the liquid crystal display panel 300y and the driver's viewing area Ara.

[0082] That is, the liquid crystal display panel 300y in the vehicle display device 100y is disposed between the concave mirror 325y and the driver's viewing area Ara.

[0083] In addition, the concave mirror 325y in the vehicle display device 100y determines the arrangement of the projected image and the position of the light source.

[0084] 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.

[0085] However, when reducing the size in this way, it is difficult to achieve a projected image on a large screen, which includes the disadvantage of being difficult to implement an AR HUD.

[0086] Therefore, the present disclosure proposes a method for reducing the size of the vehicle display device while achieving a projected image on a large screen.

[0087] In particular, different from Figure 2a and Figure 2b , the vehicle display device 100 that utilizes two reflections on the windshield WS is proposed. This will be described with reference to Figure 3 and below.

[0088] Figure 3 is a diagram showing an example of the internal structure of a vehicle display device according to an embodiment of the present disclosure.

[0089] Referring to this diagram, the vehicle display device 100 according to an embodiment of the present disclosure includes: an image generation device 300 configured to output a projected image in the direction of the windshield WS; and a mirror 325 configured to reflect the projected image reflected from the first region Ra of the windshield WS in the direction of the windshield WS.

[0090] The projected image from the mirror 325 is reflected from the second region Rb of the windshield WS and output to the third region Ara. At this time, the third region Ara may correspond to the driver's viewing area.

[0091] In addition, since the vehicle display device 100 according to an embodiment of the present disclosure utilizes two reflections from the windshield WS, the size can be reduced while sufficiently ensuring the optical path.

[0092] That is, the size of the vehicle display device 100 according to an embodiment of the present disclosure is SZa, and SZa is smaller than Figure 2a the size SZx of the vehicle display device 100x or Figure 2b the size SZy of the vehicle display device 100y.

[0093] Accordingly, it is possible to reduce the size of the vehicle display device while projecting an image on a large screen. In particular, it is possible to reduce the size while ensuring the optical path.

[0094] In addition, the second region Rb of the windshield WS may be closer to the third region Ara than the first region Ra of the windshield WS.

[0095] In addition, the incident angle of the projected image incident on the first region Ra of the windshield WS may be greater than the incident angle of the projected image incident on the second region Rb of the windshield WS. Accordingly, it is possible to reduce the size of the vehicle display device while projecting an image on a large screen.

[0096] In addition, the image generation device 300 may be closer to the third region Ara than the mirror 325.

[0097] In addition, the position of the image generation device 300 may be set at a position higher than the position of the mirror 325. Accordingly, it is possible to reduce the size of the vehicle display device while projecting an image on a large screen.

[0098] In addition, the image generation device 300 may be equipped with a digital mirror device or a liquid crystal display panel. Accordingly, it is possible to output the projected image to the outside of the image generation device 300.

[0099] For example, the image generation device 300 may include a light source (not shown) and a digital mirror device (not shown) configured to reflect the light output from the light source.

[0100] The light source may include an LED diode or a laser diode, etc.

[0101] In addition, the digital mirror device may have a plurality of digital mirrors. For example, it may have a digital micromirror device (DMD).

[0102] As another example, the image generation device 300 may include: a light source (not shown); and a liquid crystal display panel (not shown) configured to output a projected image based on the light output from the light source.

[0103] In addition, the liquid crystal display panel may output a projected image of P-polarized light.

[0104] In addition, the first region Ra of the windshield WS may correspond to Figure 1 the black masking region or the frit region FZ. Accordingly, the brightness of the projected image can be improved.

[0105] In addition, the vehicle display device 100 according to an embodiment of the present disclosure may further include a transparent cover 335 disposed between the image generation device 300 and the windshield WS. Accordingly, the interior of the image generation device 300 can be protected while the projected image can be output to the outside of the image generation device 300.

[0106] In addition, in Figure 2a the vehicle display device 100x, the optical path before the first reflection of the projected image output from the liquid crystal display panel 300x is formed to be shorter than the optical path in the range from after the first reflection to before the second reflection.

[0107] At this time, the optical path before the first reflection of the projected image output from the liquid crystal display panel 300x corresponds to the space between the liquid crystal display panel 300x and the folding mirror 315x, and the optical path from after the first reflection to before the second reflection corresponds to the space between the folding mirror 315x and the concave mirror 325x.

[0108] In particular, in Figure 2a the vehicle display device 100x, the optical path before the first reflection of the projected image output from the liquid crystal display panel 300x is significantly shorter than the optical path from after the first reflection to before the second reflection.

[0109] In addition, in the vehicle display device 100 according to an embodiment of the present disclosure, the optical path before the first reflection of the projected image output from the image generation device 300 is longer than the optical path from after the first reflection to before the second reflection.

[0110] In Figure 3 the vehicle display device 100, the optical path before the first reflection of the projected image output from the image generation device 300 corresponds to the space between the image generation device 300 and the first region Ra of the windshield WS.

[0111] In addition, in the vehicle display device 100, the optical path from after the first reflection to before the second reflection corresponds to the space between the first region Ra of the windshield WS and the mirror 325.

[0112] As shown in this figure, the optical path before the first reflection of the projected image output from the image generation device 300 is formed to be longer than the optical path from after the first reflection to before the second reflection, so that a sufficient optical path can be ensured within the vehicle display device 100 of a small size SZ.

[0113] Figure 4 is a diagram for explaining Figure 3 this.

[0114] Referring to this figure, the size of the vehicle display device 100 according to an embodiment of the present disclosure is SZa, and SZa is smaller thanFigure 2a The size SZx of the vehicle display device 100x.

[0115] In addition, the size of the vehicle display device 100 according to an embodiment of the present disclosure is SZa, and SZa is smaller than Figure 2b the size SZy of the vehicle display device 100y.

[0116] Accordingly, it is possible to reduce the size of the vehicle display device while realizing a projection image on a large screen. In particular, it is possible to reduce the size while ensuring the optical path.

[0117] Figure 5 FIG. is a diagram showing an example of the internal structure of a vehicle display device according to another embodiment of the present disclosure.

[0118] In addition, in the windshield WS, the reflectance of S-polarized light is higher than that of P-polarized light. Accordingly, the brightness of the projection image based on S-polarized light can be higher.

[0119] Therefore, in order to increase the reflectance of P-polarized light, it is preferable to attach a P-polarized light reflecting film 415 to the windshield WS.

[0120] Referring to this figure, a vehicle display device 100b according to another embodiment of the present disclosure includes: an image generation device 300 configured to output a projection image to a first region Ra of the windshield WS to which the P-polarized light reflecting film 415 is attached; and a mirror 325 configured to reflect the projection image reflected from the first region Ra of the windshield WS to a second region Rb of the windshield WS to which the P-polarized light reflecting film 415 is attached.

[0121] The projection image from the mirror 325 is reflected from the second region Rb of the windshield WS and output to a third region Ara. At this time, the third region Ara may correspond to the observation region of the driver. Accordingly, it is possible to reduce the size of the vehicle display device while realizing a projection image on a large screen.

[0122] In addition, the vehicle display device 100b according to another embodiment of the present disclosure may further include a transparent cover 335 provided between the image generation device 300 and the windshield WS. Accordingly, the inside of the image generation device 300 can be protected while the projection image can be output to the outside of the image generation device 300.

[0123] Figure 6 FIG. is a diagram showing an example of the internal structure of a vehicle display device according to another embodiment of the present disclosure.

[0124] Referring to the figure, a vehicle display device 100c according to another embodiment of the present disclosure includes: an image generation device 300 configured to output a projection image in the direction of the windshield WS; and a mirror 325 configured to reflect the projection image reflected from the first region Ra of the windshield WS in the direction of the windshield WS.

[0125] In addition, Figure 6 the vehicle display device 100c is similar to Figure 3 the vehicle display device 100, but is different in the installation positions of the image generation device 300 and the mirror 325.

[0126] The projection image from the mirror 325 is reflected from the second region Rb of the windshield WS and output to the third region Ara. At this time, the third region Ara may correspond to the driver's viewing area.

[0127] In addition, the vehicle display device 100c according to another embodiment of the present disclosure utilizes two reflections from the windshield WS, thereby reducing the size while fully ensuring the optical path.

[0128] That is, the size of the vehicle display device 100c according to another embodiment of the present disclosure is SZb, and SZb is smaller than Figure 2a the size SZx of the vehicle display device 100x or Figure 2b the size SZy of the vehicle display device 100y.

[0129] Thus, it is possible to realize a projection image on a large screen while reducing the size of the vehicle display device. In particular, the size can be reduced while ensuring the optical path.

[0130] In addition, the second region Rb of the windshield WS may be closer to the third region Ara than the first region Ra of the windshield WS.

[0131] In addition, the incident angle of the projection image incident on the first region Ra of the windshield WS may be greater than the incident angle of the projection image incident on the second region Rb of the windshield WS. Thus, it is possible to realize a projection image on a large screen while reducing the size of the vehicle display device.

[0132] In addition, the mirror 325 may be closer to the third region Ara than the image generation device 300.

[0133] In addition, the position of the mirror 325 may be set at a position higher than the position of the image generation device 300. Thus, it is possible to realize a projection image on a large screen while reducing the size of the vehicle display device.

[0134] In addition, the image generation device 300 may include a digital micromirror device or a liquid crystal display panel. Accordingly, the projection image can be output to the outside of the image generation device 300.

[0135] In addition, the first region Ra of the windshield WS may correspond to Figure 1 the black masking region or the frit region FZ. Accordingly, the brightness of the projection image can be increased.

[0136] In addition, the vehicle display device 100c according to another embodiment of the present disclosure may further include a transparent cover 335 disposed between the image generation device 300 and the windshield WS. Accordingly, the inside of the image generation device 300 can be protected while the projection image can be output to the outside of the image generation device 300.

[0137] Figure 7 FIG. is an example showing the internal structure of a vehicle display device according to another embodiment of the present disclosure.

[0138] Therefore, in order to increase the reflectance of the P-polarized light, it is preferable to attach the P-polarized light reflecting film 415 to the windshield WS.

[0139] Referring to this figure, the vehicle display device 100d according to another embodiment of the present disclosure includes: an image generation device 300 configured to output a projection image to the first region Ra of the windshield WS to which the P-polarized light reflecting film 415 is attached; and a mirror 325 configured to reflect the projection image reflected from the first region Ra of the windshield WS to the second region Rb of the windshield WS to which the P-polarized light reflecting film 415 is attached.

[0140] The projection image from the mirror 325 is reflected from the second region Rb of the windshield WS and output to the third region Ara. At this time, the third region Ara may correspond to the observation region of the driver. Accordingly, the projection image can be realized on a large screen while reducing the size of the vehicle display device.

[0141] In addition, Figure 7 the vehicle display device 100d of Figure 5 is similar to the vehicle display device 100b of

[0142] except that the installation positions of the image generation device 300 and the mirror 325 are different.

[0143] Figure 8a and Figure 8b is a diagram showing Figures 3 to 7 various examples of the mirror.

[0144] Figure 8a is a diagram showing an example of the mirror.

[0145] Referring to this diagram, Figures 3 to 7 the mirror 325a of

[0146] In addition, Figures 3 to 7 the mirror 325a of

[0147] The base 710 may be a depositable substrate such as glass and plastic.

[0148] In addition, the mirror coating member 720 may be a reflective coating member deposited by, such as metal and dielectric.

[0149] Figure 8b is a diagram showing another example of the mirror.

[0150] Referring to this diagram, Figures 3 to 7 the mirror 325b of

[0151] In addition, Figures 3 to 7 the mirror 325b of

[0152] The base 710 may be a depositable substrate such as glass and plastic. The photo-resist film 715 may include an optically transparent adhesive (OCA).

[0153] In addition, the reflective film 725 may be an optical film that can be attached by lamination or the like.

[0154] Figures 9a to 10b is for explaining Figures 3 to 7 of

[0155] Figure 9a shows an example of the optical path of the projected image of the P-polarized light.

[0156] Referring to this diagram, Figures 3 to 7 in the vehicle display devices 100, 100b, 100c, 100d of

[0157] In addition, Figures 3 to 7In the vehicle display devices 100, 100b, 100c, 100d, the image generation device 300 may further include a transparent cover 335 disposed between the image generation device 300 and the windshield WS, and a phase retardation film 333 attached to the transparent cover 335.

[0158] In addition, the phase retardation film 333 may include a quarter-wave plate (QWP).

[0159] In addition, the transparent cover 335 outputs a projected image of right-handed circularly polarized light to the first region Ra of the windshield WS based on the projected image of P-polarized light, and the mirror 325 outputs a projected image of S-polarized light based on the projected image of left-handed polarized light from the first region Ra of the windshield WS, and the transparent cover 335 may output a projected image of left-handed polarized light to the second region Rb of the windshield WS based on the projected image of S-polarized light. Thus, a projected image of left-handed polarized light can be realized on a large screen while reducing the size of the vehicle display device.

[0160] Figure 9b Another example of the optical path of the projected image of P-polarized light is shown.

[0161] Referring to this figure, Figures 3 to 7 in the vehicle display devices 100, 100b, 100c, 100d, the image generation device 300 includes a liquid crystal display panel, and the liquid crystal display panel can output a projected image of P-polarized light.

[0162] In addition, Figures 3 to 7 in the vehicle display devices 100, 100b, 100c, 100d, the image generation device 300 may further include a transparent cover 335 disposed between the image generation device 300 and the windshield WS.

[0163] In addition, the phase retardation film 333 may be attached to the first region Ra of the windshield WS.

[0164] In addition, the phase retardation film 333 may include a quarter-wave plate (QWP).

[0165] In addition, the mirror 325 reflects the projected image of S-polarized light from the first region Ra of the windshield WS, and the transparent cover 335 can output the projected image of S-polarized light to the second region Rb of the windshield WS. Thus, a projected image of S-polarized light can be realized on a large screen while reducing the size.

[0166] Figure 10a is a diagram showing Figure 3 the optical path in the vehicle display device 100.

[0167] Referring to this figure, an image generation device 300 that is closer to the third region Ara than the mirror 325 outputs multiple light beams to the first region Ra of the windshield WS.

[0168] The mirror 325 reflects the multiple light beams that are first reflected from the first region Ra of the windshield WS and outputs them to the second region Rb of the windshield WS, where the second region Rb of the windshield WS is higher than the first region Ra of the windshield WS.

[0169] In addition, the multiple light beams that are secondarily reflected from the second region Rb of the windshield WS are incident on the third region Ara corresponding to the user's viewing area.

[0170] Therefore, the driver recognizes a virtual image in the direction opposite to that of the windshield WS.

[0171] Thus, it is possible to implement a projected image on a large screen while reducing the size of the vehicle display device. In particular, it is possible to reduce the size while ensuring the optical path.

[0172] Figure 10b is a diagram showing Figure 6 the optical path in the vehicle display device 100c.

[0173] Referring to this figure, an image generation device 300 that is set to be farther from the third region Ara than the mirror 325 outputs multiple light beams to the first region Ra of the windshield WS.

[0174] The mirror 325 reflects the multiple light beams that are first reflected from the first region Ra of the windshield WS and outputs them to the second region Rb of the windshield WS, where the second region Rb of the windshield WS is higher than the first region Ra of the windshield WS.

[0175] In addition, the multiple light beams that are secondarily reflected from the second region Rb of the windshield WS are incident on the third region Ara corresponding to the user's viewing area.

[0176] Therefore, the driver recognizes a virtual image in the direction opposite to that of the windshield WS.

[0177] Thus, it is possible to implement a projected image on a large screen while reducing the size of the vehicle display device. In particular, it is possible to reduce the size while ensuring the optical path.

[0178] In addition, although the present disclosure has been described with reference to specific embodiments shown in the accompanying drawings, it will be apparent to those skilled in the art that the description is not limited to those exemplary embodiments, and that the description can be implemented in various forms without departing from the scope of the present disclosure, which is described in the appended claims. These modifications should not be understood separately from the technical spirit or scope of the present disclosure.

Claims

1. A display device for a vehicle, the display device comprising: an image generation device configured to output a projection image toward a windshield; and a mirror configured to reflect the projection image reflected from a first region of the windshield back toward the windshield, wherein the projection image from the mirror is reflected from a second region of the windshield and output to a third region.

2. The display device according to claim 1, wherein, The second region of the windshield is closer to the third region than the first region of the windshield.

3. The display device according to claim 1, wherein, The incident angle of the projection image incident on the first region of the windshield is greater than the incident angle of the projection image incident on the second region of the windshield.

4. The display device according to claim 1, wherein The image generation device is closer to the third region than the mirror.

5. The display device according to claim 1, wherein, The mirror is closer to the third region than the image generation device.

6. The display device according to claim 1, the display device further comprising a transparent cover disposed between the image generation device and the windshield.

7. The display device according to claim 1, wherein, The image generation device includes a digital micromirror device or a liquid crystal display panel.

8. The display device according to claim 1, wherein, The image generation device is configured to output a projection image to the first region of the windshield to which a P-polarized light reflecting film is attached, wherein the mirror is configured to reflect the projection image to the second region of the windshield to which the P-polarized light reflecting film is attached.

9. The display device according to claim 1, wherein, The first region of the windshield corresponds to a black masking region or a frit region.

10. The display device according to claim 9, the display device further comprising: a transparent cover disposed between the image generation device and the windshield; and a phase retardation film attached to the transparent cover, wherein the image generation device includes a liquid crystal display panel, wherein the liquid crystal display panel is configured to output a projection image of P-polarized light, wherein the transparent cover is configured to output a projection image of right-handed circularly polarized light to the first region of the windshield based on the projection image of P-polarized light, wherein the mirror outputs a projection image of S-polarized light based on the projection image of left-handed circularly polarized light from the first region of the windshield, wherein the transparent cover is configured to output a projection image of left-handed circularly polarized light to the second region of the windshield based on the projection image of S-polarized light.

11. The display device according to claim 1, the display device further comprising a transparent cover disposed between the image generation device and the windshield, Among them, a phase retardation film attached to the first region of the windshield, wherein the image generation device includes a liquid crystal display panel, wherein the liquid crystal display panel is configured to output a projection image of P-polarized light, wherein the mirror reflects the projection image of S-polarized light from the first region of the windshield, wherein the transparent cover is configured to output the projection image of S-polarized light to the second region of the windshield.

12. The display device according to claim 1, wherein, The mirror includes: a base; and a mirror coating member formed on the base.

13. The display device according to claim 1, wherein, The mirror includes: a base; A photosensitive resin film formed on the base; and A reflective film on the photosensitive resin film.

14. The display device according to claim 1, wherein, The optical path before the first reflection of the projected image output from the image generating device is longer than the optical path from after the first reflection to before the second reflection.

15. A display device for a vehicle, the display device comprising: An image generating device configured to output a projected image toward a windshield; And A mirror configured to reflect the projected image first reflected from the windshield back toward the windshield, wherein the projected image from the mirror is second reflected from the windshield, and wherein the optical path before the first reflection of the projected image output from the image generating device is longer than the optical path from after the first reflection to before the second reflection.

Images