Head-up display device

Abstract

To provide a head-up display device for performing display in which a display angle when visually recognizing a virtual image is made different from a display angle when visually recognizing a real image.SOLUTION: The head-up display device includes a display part 12 capable of switching the polarization of emitted light to first polarization and second polarization different from each other, a first mirror 131 for reflecting display light L1 as the first polarization and transmitting display light L2 as the second polarization, a second mirror 132 for reflecting the display light L2, a motor 14 for rotating so as to make the angle of the display part 12 with respect to an optical path variable, and a control part 15 for controlling the display part 12 and the motor 14. The control part 15 controls so as to make the angle of the display part 12 with respect to the optical path different between when the display light L1 is emitted and when the display light L2 is emitted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a head-up display device that displays a desired image to a viewer by switching between a virtual image and a real image. [Background technology]

[0002] A head-up display device described in Patent Document 1 is known in the related art. In this head-up display device, in a configuration in which a display image displayed on a screen by light from a display is reflected onto a light-transmitting member, the front-to-rear positional relationship between the optical focus of an imaging optical system and the screen is changed to switch between a state in which a virtual image is visually recognized outside the light-transmitting member and a state in which a real image is visually recognized inside the light-transmitting member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-70074 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology described in Patent Document 1 does not take into consideration switching so that the display angle when a virtual image is viewed and the display angle when a real image is viewed are different.

[0005] Virtual image display angle and real image In order to make the display angle different from that of the head-up display, for example, a method of changing the arrangement of the mirrors in the optical system can be considered. In this case, since it is necessary to mechanically change the arrangement position of the mirrors, the size of the housing of the head-up display device becomes large, which causes a problem of poor mountability.

[0006] Even if the position of the mirror can be changed, the directivity of the light source can cause unevenness in the brightness of the displayed image. To eliminate such unevenness in brightness, it is necessary to switch the directivity of the light source, but there is a problem in that the control of switching the directivity is very difficult technically.

[0007] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a head-up display device that can display a different display angle when a virtual image is viewed from a display angle when a real image is viewed, without increasing the size of the device and with simple control. [Means for solving the problem]

[0008] The present invention provides a head-up display device 1 having an exit 17 and emitting display light L from the exit 17 toward a light-transmitting member WS to allow a virtual image VI and a real image RI of a display image represented by the display light L to be visually recognized. The head-up display device 1 includes a display element 121 and a switching element 122 that is provided closer to the exit 17 along an optical path than the display element 121 and is capable of switching the polarization of the emitted light between a first polarized light and a second polarized light that are different from each other. The display unit 12 transmits light emitted by a light source 11 and displays the display image. The reflecting unit 13 reflects light representing the display image displayed on the display unit 12 toward the light-transmitting member WS. The driving unit 14 rotates the display unit 12 so that an angle with respect to the optical path is variable. The control unit 15 controls the switching element 122 and the driving unit 14. The reflecting unit 13 is a first mirror 12 that reflects a first light ray L1 having a first polarized light and transmits a second light ray L2 having a second polarized light. 31 and a second mirror 132 that reflects the second light ray L2, the first mirror 131 and the second mirror 132 are arranged such that, when the display element 121 emits the first light ray L1, a positional relationship between an optical focus F of an imaging optical system including the translucent member WS and the reflecting unit 13 and the display unit 12 is a first state in which the display unit 12 is closer to the exit 17 than the optical focus F, and when the display element 121 emits the second light ray L2, the positional relationship is a second state in which the display unit 12 is closer to the light source 11 than the optical focus F, and the control unit 15 controls the display element 121 and the drive unit 14 in cooperation with each other so that the angle of the display unit 12 in the first state in which the first light ray L1 is emitted from the display element 121 and the angle of the display unit 12 in the second state in which the second light ray L2 is emitted from the display element 121 are different from each other. Effect of the Invention

[0009] According to the present invention, it is possible to visually distinguish the display angle of a virtual image from the display angle of a real image by simply controlling the polarization of light and the angle of the display unit relative to the optical path, without increasing the size of the device by changing the position of the mirrors. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a diagram showing a configuration for generating a virtual image in a head-up display device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a configuration for generating a real image in a head-up display device according to an embodiment of the present invention. [Diagram 3] 1 is a schematic diagram showing the structure of a light source and a display unit in a head-up display device according to an embodiment of the present invention; [Figure 4] FIG. 2 is a functional block diagram showing the configuration of a PGU in the head-up display device according to an embodiment of the present invention. [Diagram 5] FIG. 4 is a diagram showing measurement points of luminance uniformity in a head-up display device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing a configuration in which a virtual image is generated in a head-up display device (hereinafter, referred to as a HUD device) according to this embodiment, and Fig. 2 is a diagram showing a configuration in which a real image is generated in the HUD device according to this embodiment.

[0012] 1 and 2, the HUD device 1 includes a PGU (Picture Generation Unit) 10 including a light source 11 that is made of, for example, a light-emitting diode that emits light in the visible wavelength range mounted on a wiring board and emits white light, and a display unit 12 that generates an image using the light incident from the light source 11 and displays the image by switching the polarization of the emitted light between a first polarization and a second polarization that are different from each other, a reflecting unit 13 that reflects display light L (display light L1 that represents a display image of a virtual image VI in the case of FIG. 1, and display light L2 that represents a display image of a real image RI in the case of FIG. 2) that represents an image displayed on the display unit 12 toward a windshield WS (translucent member), a motor 14 (driving unit) that rotates the display unit 12 so that the angle with respect to the optical path of the display light L is variable, and a control unit 15 that controls the display content on the display unit 12, controls the switching between the first polarization and the second polarization, and controls the driving of the motor 14, and these are contained in a housing 16. An opening 17 (outlet) through which the display light L is emitted is provided in the housing 16, and a cover glass 18 for protecting the inside is disposed in the opening 17. The windshield WS is an example of a light-projecting member, the motor 14 is an example of a drive unit, and the opening 17 is an example of an outlet.

[0013] The HUD device 1 is disposed below the windshield WS of the vehicle C (for example, inside the instrument panel), and emits display light L (L1, L2) and projects it onto the windshield WS. The display light L is generated by a light source 11 and a display unit 12 inside the HUD device 1. The display light L emitted from the display unit 12 travels along a reflecting unit 13 and is emitted through an opening 17 of a housing 16 and a cover glass 18. By viewing the display light L reflected by the windshield WS, an occupant DR of the vehicle C can view a virtual image VI on the back side of the windshield WS as shown in FIG. 1 and a real image RI on the front side as shown in FIG. 2.

[0014] In the virtual image VI shown in FIG. 1, information that is highly necessary to draw the attention of the occupant DR, such as vehicle information such as the speed and engine RPM of the vehicle C, route guidance displays such as turn-by-turn and maps, blind spot indicators, warning displays such as speed limit exceeding warnings, etc., are displayed on the other side of the windshield WS as viewed from the occupant DR. In addition, in the real image RI shown in FIG. 2, for example, entertainment content, assistants and agents that support the occupant DR, and characters representing them are displayed on the front side of the windshield WS as viewed from the occupant DR. These displays provide a driving environment in which the need for viewpoint movement and eye focal length adjustment is reduced. The virtual image VI and real image RI include characters and icons indicating these information as well as background parts, which are, for example, approximately rectangular in shape when viewed in a planar view from the occupant DR.

[0015] Here, the configurations of the light source 11 and the display unit 12 will be described. Fig. 3 is a schematic diagram showing the structure of the light source and the display unit in the HUD device according to this embodiment. As shown in Fig. 3, the display unit 12 is provided closer to the emission port along the optical path than the light source 11. The display unit 12 includes, for example, a TFT (Thin Film Transistor) type display element 121, and a switching element 122 that is provided closer to the emission port along the optical path than the display element 121 and switches the polarization of the emitted display light L between first polarization and second polarization that are different from each other.

[0016] For example, the first polarized light may be S polarized light and the second polarized light may be P polarized light, or vice versa. In addition, it is not limited to S polarized light or P polarized light, as long as the polarization angles of the first polarized light and the second polarized light are different, and it is preferable that the polarization angles differ by at least 22.5 degrees, for example.

[0017] The display element 121 is connected to the display control unit 21, which will be described later in FIG. 4, and forms light that displays a figure of any shape according to a signal sent from the display control unit 21. The switching element 122 extracts only light of a specific polarization, specifically, the above-mentioned first polarization or second polarization, from the light beam emitted from the display element 121, and switches between them. The switching element 122 is connected to the display unit drive unit 22, which will be described later in FIG. 4, and switches the polarization according to a signal sent from the display unit drive unit 22.

[0018] The switching of polarization by the switching element 122 may be performed by electrical processing, or the polarization may be switched by arranging a polarizing plate or a wavelength plate on the exit side of the display element 121 and physically rotating the central axis at a predetermined angle with the optical axis direction as the central axis. In either case, the polarization is switched under the control of the display unit drive unit 22.

[0019] In addition, as shown in Figs. 1 and 2, the display unit 12 rotates so that the angle with respect to the optical path is variable with the driving operation of the motor 14. In Figs. 1 and 2, when switching between the virtual image VI and the real image RI according to the situation, there are cases where it is desired to display the display image far away from the occupant DR as if it is inclined with respect to the road surface and the display image near standing vertically to the road surface. For example, if the display image of the virtual image VI is inclined far away, the display appears to be developed on the road surface, so that when performing navigation, the road surface and the display can be visually recognized as being superimposed, and intuitive information presentation is possible. On the other hand, for example, if the display image of the real image RI is inclined near and vertical, it is assumed to be used in situations such as automatic driving or watching entertainment content while stopped, and it is possible to improve visibility for the occupant DR.

[0020] As described above, since it is necessary to appropriately control the inclination of the display image depending on the situation, specifically, when the optical axis direction is the roll axis, the display unit 12 is rotated by pitch to display the display image represented by the display light L vertically to the road surface or tilted. For example, in the case of FIG. 1, the motor 14 that rotates the display unit 12 is controlled so that the light emitting surface of the light source 11 and the exit surface from which the display unit 12 emits the display light L1 are non-parallel, so that the occupant DR views the display image of the display light L1, which is the first polarized light, tilted with respect to the road surface. In the case of FIG. 2, the motor 14 that rotates the display unit 12 is controlled so that the light emitting surface of the light source 11 and the exit surface from which the display unit 12 emits the display light L2 are parallel, so that the occupant DR views the display image of the display light L2, which is the second polarized light, as if it were standing vertically to the road surface. The control of the motor 14 when rotating the display unit 12 is performed by the display unit drive unit 22, which will be described later in FIG. 4.

[0021] The reflecting unit 13 includes a first mirror 131, a second mirror 132, and a third mirror 133, each of which is a flat or curved mirror. The first mirror 131 reflects the display light L1 (first light ray) having the first polarization and transmits the display light L2 (second light ray) having the second polarization. The second mirror 132 is a mirror that reflects the display light L2 (second light ray) that transmits through the first mirror 131. The display lights L1 and L2 reflected by the first mirror 131 and the second mirror 132 are guided to the third mirror 133, reflected by the third mirror 133, and emitted to the windshield WS, so that the occupant DR can view the respective display images. The display light L1 is an example of a first light ray, and the display light L2 is an example of a second light ray.

[0022] 2, since the first mirror 131 is a mirror that transmits the display light L2, the display light L2 reflected by the second mirror 132 can also be transmitted from the rear side to the front side of the second mirror 132. That is, as shown in FIG. 2, the display light L2 transmitted through the first mirror 131 is reflected by the second mirror 132, transmitted through the first mirror 131 again, and guided to the third mirror 133. This makes it possible to arrange the second mirror 132 close to the rear side of the first mirror 131, and prevents the housing 16 from becoming large.

[0023] Here, for example, the first polarized light is S polarized light (S polarized light relative to the first mirror 131), the second polarized light is P polarized light (P polarized light relative to the first mirror 131), the first mirror 131 is a mirror that reflects S polarized light toward the first mirror 131 and transmits P polarized light, and the second mirror 132 is a mirror that reflects P polarized light toward the first mirror 131 and transmits S polarized light. In this configuration, the display light L1, which is S polarized light, is reflected by the first mirror 131 and guided to the third mirror 133. The display light L2, which is P polarized light, is transmitted through the first mirror 131, reflected by the second mirror 132, and guided to the third mirror 133. By setting such a configuration of the reflecting unit 13 and the polarizations of the display lights L1 and L2, it is possible for the display lights L1 and L2 to generate different display images.

[0024] A display image represented by the display light L1 in Fig. 1 and a display image represented by the display light L2 in Fig. 2 will be specifically described. As shown in Fig. 1, when the display light L1, which is a first polarized light (here, S polarized light), is emitted to the first mirror 131, by arranging the display unit 12 at a position sufficiently close to the first mirror 131, when the first mirror 131, the third mirror 133, and the windshield WS are regarded as one imaging optical system, the position of the display unit 12 becomes closer than the focal length of the imaging optical system. That is, the positional relationship between the optical focus F of the imaging optical system and the display unit 12 becomes a first state in which the display unit 12 is arranged closer to the exit side than the optical focus F. In this first state, the occupant DR visually recognizes a virtual image VI in the distance.

[0025] 2, when display light L2 having the second polarization (here, P polarization) is emitted to the second mirror 132, by arranging the display unit 12 at a position sufficiently far from the second mirror 132, when the second mirror 132, the third mirror 133, and the windshield WS are regarded as a single imaging optical system, the position of the display unit 12 becomes farther than the focal length of the imaging optical system. That is, the positional relationship between the optical focus F of the imaging optical system and the display unit 12 becomes a second state in which the display unit 12 is arranged closer to the light source 11 than the optical focus F. In this second state, the occupant DR visually recognizes a real image RI in front of him.

[0026] That is, for example, when it is desired that a virtual image VI inclined with respect to the road surface be viewed outside the windshield WS as seen from the occupant DR, the switching element 122 of the display unit 12 switches the display light L to be emitted as S-polarized display light L1, and the display image represented by the display light L1 is displayed on the windshield WS by the imaging optical system composed of the first mirror 131, the third mirror 133, and the windshield WS. Also, for example, when it is desired that a real image RI standing perpendicular to the road surface be viewed inside the windshield WS as seen from the occupant DR, the switching element 122 of the display unit 12 switches the display light L to be emitted as P-polarized display light L2, and the display image represented by the display light L2 is displayed on the windshield WS by the imaging optical system composed of the second mirror 132, the third mirror 133, and the windshield WS. At this time, by controlling the display element 121 and the motor 14 in coordination so that the angle of the display unit 12 in the first state (the rotation angle of the motor 14) and the angle of the display unit 12 in the second state (the rotation angle of the motor 14) are different from each other, it is possible to view the virtual image VI and real image RI relative to the road surface at the desired angle.

[0027] In the explanation of Figures 1 and 2 above, it is described that a virtual image VI is viewed outside the windshield WS, inclined with respect to the road surface, as viewed from the occupant DR, and a real image RI is viewed inside the windshield WS, perpendicular to the road surface, as viewed from the occupant DR. However, as described above, the rotation angle of motor 14 may be controlled so that the virtual image VI and real image RI are each viewed at a different inclination angle with respect to the road surface, regardless of the size of the angle with the road surface.

[0028] Furthermore, when a virtual image VI is viewed outside the windshield WS, the rotation angle of the motor 14 may be controlled so that the inclination angle of the virtual image VI is less than 45 degrees (first angle) with respect to the road surface, and when a real image RI is viewed inside the windshield WS, the rotation angle of the motor 14 may be controlled so that the inclination angle of the real image RI is 45 degrees or more (second angle) with respect to the road surface. Conversely, the rotation angle of the motor 14 may be controlled so that the inclination angle of the virtual image VI on the outside of the windshield WS is 45 degrees or more (second angle) with respect to the road surface, and the rotation angle of the motor 14 may be controlled so that the inclination angle of the real image RI on the inside of the windshield WS is less than 45 degrees (first angle) with respect to the road surface. Less than 45 degrees is an example of the first angle, and 45 degrees or more is an example of the second angle.

[0029] FIG. 4 is a functional block diagram showing the configuration of the PGU in the HUD device according to this embodiment. Note that FIG. 4 shows only the minimum necessary configuration directly related to the present invention, and other known configurations are omitted. In FIG. 4, the PGU 10 includes a control unit 15, a light source 11, and a display unit 12. The control unit 15 includes a display control unit 21 that issues an instruction to the display unit 12 to generate light representing a figure of any shape based on information sent from various devices 30 such as a vehicle speed sensor, a navigation device, a RADAR (Radio Detecting and Ranging), a LiDAR (Light Detection and Ranging, Laser Imaging Detection and Ranging), and a display unit drive unit 22 that controls the inclination angle of the displayed image with respect to the road surface and the switching control of the polarization direction based on a signal sent from a switch 20 that switches between driving modes (manual driving, automatic driving), for example.

[0030] The display unit 12 also includes a TFT-type display element 121 that forms light representing a figure of any shape in accordance with a signal sent from the display control unit 21, a switching element 122 that switches the emitted display light L to either the first polarized display light L1 or the second polarized display light L2 in accordance with a signal sent from the display unit drive unit 22, and a motor 14 that rotates in accordance with the signal sent from the display unit drive unit 22 so that the angle of the display light L with respect to the optical path can be changed.

[0031] 4, for example, during manual driving, the display unit drive unit 22 controls the switching element 122 to emit the display light L1 of the first polarization, and drives and controls the rotation angle of the motor 14 that rotates the display unit 12 to an angle at which the display image in the display light L1 is inclined with respect to the road surface. At this time, the display control unit 21 controls the display element 121 to generate the display light L1 that displays the vehicle information, route guidance information, warning display, etc., as described above.

[0032] Also, for example, during autonomous driving, the display unit drive unit 22 controls the switching element 122 to emit the display light L2 of the second polarization, and drives and controls the rotation angle of the motor 14 that rotates the display unit 12 to an angle at which the display image of the display light L2 stands perpendicular to the road surface. At this time, the display control unit 21 controls the display element 121 to generate display light L2 representing an assistant or agent that supports the occupant DR as described above, or a character that represents them.

[0033] In the HUD device 1 according to this embodiment, it is desirable that the representative rays in the optical path of the display light L1 and the optical path of the display light L2 are aligned. The incident angle of the light rays on the display unit 12 changes according to the rotation angle of the display unit 12 under the control of the display unit drive unit 22, but the optical axis is hardly shifted because the display unit 12 is extremely thin. Even if the directions of the display light L1 and the display light L2 are shifted, the directions of the display lights L1 and L2 are not taken into consideration as long as the luminance uniformity is within the range of the guarantee conditions shown below.

[0034] 5 is a diagram showing measurement points of the luminance uniformity in the HUD device according to this embodiment. The uniformity here means the degree to which the unevenness of the luminance distribution at each point in the display area is suppressed. The rectangle shown in FIG. 5 is a display area WR showing the entire display area of ​​the virtual image VI and the real image RI, and when a white light beam is emitted to the entire display area of ​​the display unit 12, if the white light beam is not blocked by the housing 16 or other exterior, the rectangular display image shown in the display area WR is displayed by the display light L1 and the display light L2.

[0035] Here, for example, in the display region WR, a total of nine points P (P1 to P9) are set, including a center point, four points on the top, bottom, left, and right, and four points on the four corners, and the luminance at each point P is measured. If the maximum value of the luminance measured at each point P1 to P9 is Bmax and the minimum value is Bmin, r=Bmin / Bmax is defined as the uniformity of the display image. If the value of r is equal to or greater than a predetermined threshold value (e.g., 0.7 or 0.8), it is determined that the uniformity is ensured. That is, in the HUD device 1 according to this embodiment, if the value of r is equal to or greater than a predetermined threshold value, it can be determined that even if a deviation occurs in the direction of the display light L1 and the display light L2, there is no effect on the visibility of the occupant DR and no particular consideration is required.

[0036] Furthermore, in order to make the representative rays of the optical paths of the display light L1 and the display light L2 coincide with each other, the rotation axis of the motor 14 that rotates the display unit 12 may be made to approximately coincide with the center position of the side view shape of the display unit 12 as seen from one side along the rotation axis (the center position when the display unit 12 is seen from the paper surface direction shown in Figures 1 and 2). In this way, the representative rays of the optical paths of the display light L1 and the display light L2 coincide with each other, and uniformity can be ensured.

[0037] Furthermore, with regard to the measurement of the uniformity shown in FIG. 5, the uniformity may be calculated periodically or irregularly, and the rotation angle of the motor 14 and the polarization angles of the first polarized light and the second polarized light may be reset by calibration to an extent that the uniformity can be guaranteed.

[0038] In this way, in the HUD device 1 according to the present embodiment, the inclination angles of the virtual image VI and the real image RI with respect to the road surface can be varied by simple control without enlarging the size of the device, and a variety of display modes suitable for the display contents can be achieved. In particular, in the case of a vehicle C having a function of switching between a manual driving mode and an automatic driving mode, in the manual driving mode, information important for the driving operation of the occupant DR is displayed as a virtual image VI inclined with respect to the road surface (for example, at an angle of less than 45 degrees) on the outside of the windshield WS, and in the automatic driving mode, information that is highly entertaining for the occupant DR is displayed as a real image RI standing perpendicular to the road surface (for example, at an angle of 45 degrees or more) on the inside of the windshield WS, thereby allowing the occupant DR to view desired information in an appropriate manner according to the driving environment of the occupant DR and improving the visibility of the occupant DR.

[0039] Furthermore, by making the first polarization an S-polarized light relative to the first mirror 131 and the second polarization a P-polarized light relative to the first mirror 131, it is possible to switch between display lights L1 and L2, which have different optical characteristics and display modes, with simple control, thereby realizing a variety of displays.

[0040] Furthermore, since the rotation axis of the display unit 12, which rotates under the control of the motor 14, approximately coincides with the center position of the side view shape of the display unit 12 as seen from one side along the rotation axis, a high-quality display with guaranteed uniformity can be realized. [Explanation of symbols]

[0041] C Vehicle DR Crew Member F optical focus L(L1,L2) Display light P(P1~P9) points VI Virtual Image RI real image WR display area WS Windshield 1 HUD device 10 PGU 11 Light source 12 Display section 13 Reflector 14 Motor 15 Control section 16 Case 17 Opening 18 Coverslip 20 Switch 21 Display control unit 22 Display drive unit 30 Various Devices 121 Display element 122 Switching element 131 Mirror No. 1 132 2nd Mirror 133 3rd Mirror

Claims

1. A head-up display device having an emission port, and emitting display light from the emission port toward a light-transmitting member to allow a virtual image and a real image of a display image represented by the display light to be visually recognized, a display section including a display element and a switching element that is provided on the exit side along the optical path from the display element and is capable of switching the polarization of the emitted light between a first polarization and a second polarization that are different from each other, the display section transmitting light emitted by a light source and displaying the display image; a reflecting section that reflects light representing the display image displayed on the display section toward the light-transmitting member; a drive unit that rotates the display unit so that an angle of the display unit with respect to the optical path is variable; A control unit that controls the switching element and the drive unit; having The reflecting portion is a first mirror that reflects a first light beam having a first polarization and transmits a second light beam having a second polarization; a second mirror that reflects the second light beam; Including, The first mirror and the second mirror are when the display element emits the first light ray, a positional relationship between an optical focal point of an imaging optical system including the light-transmitting member and the reflecting portion and the display portion is in a first state in which the display portion is closer to the exit port than the optical focal point, When the display element emits the second light beam, the display unit is disposed in a second state in which the display unit is closer to the light source than the optical focus, The control unit is The display element and the drive unit are controlled in cooperation with each other so that the angle of the display unit in the first state in which the first light beam is emitted from the display element and the angle of the display unit in the second state in which the second light beam is emitted from the display element are different from each other. A head-up display device.

2. The control unit is The virtual image to be viewed in the first state is viewed at a first angle of less than 45 degrees with respect to a road surface, and the real image to be viewed in the second state is viewed at a second angle of 45 degrees or more with respect to a road surface; The virtual image to be viewed in the first state is viewed at the second angle, and the real image to be viewed in the second state is viewed at the first angle. The switching element and the driving unit are controlled so as to 2. The head-up display device according to claim 1.

3. The control unit is The switching element and the driving unit are controlled so that the virtual image to be viewed in the first state is viewed at the first angle, and the real image to be viewed in the second state is viewed at the second angle.

3. The head-up display device according to claim 2.

4. The first polarization is S-polarized light for the first mirror; The second polarization is P-polarized light for the first mirror; 4. The head-up display device according to claim 3.

5. The rotation axis of the display unit that rotates under the control of the drive unit and the center position of the display unit in a side view from one side along the rotation axis are substantially aligned.

5. The head-up display device according to claim 1,

Images