Display system

Abstract

We provide a display system that can switch between display modes depending on the situation. [Solution] The display system 10 includes a first display device 100 that displays a first virtual image 101 in front of the user, and a control unit 500 that controls the first display device. The first display device includes a display element 130 that emits image light that becomes the first virtual image, and a reflecting unit 140 that forms the first virtual image by reflecting the image light. The display element has a full display area 131 that is wider than the display area 141 corresponding to the field of view of the reflecting unit, and also includes a first reference area R1 within the full display area, and a second area R2 within the full display area that includes an overlapping area R21 that overlaps at least a part of the first area and a non-overlapping area R22 that extends beyond the first area. The control unit controls the first display device to switch between a first state in which the first virtual image is formed only in the first area, and a second state in which the first virtual image is formed in both the first and second areas.

Description

【Technical Field】 【0006】 , , , 【0001】 The present disclosure relates to a display system. 【Background Art】 【0002】 Patent Document 1 discloses an in-vehicle display device that transmits light entering from outside the vehicle and reflects video light projected from an optical unit disposed inside the vehicle by a reflection unit, thereby displaying a virtual image superimposed on the scenery outside the vehicle. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2013-180713 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In recent years, there has been a demand for a display system whose display mode can be switched according to the situation for a user (driver). 【0005】 Therefore, an object of the present disclosure is to provide a display system capable of switching a display mode according to the situation. 【Means for Solving the Problems】 【0006】 A display system according to one aspect of the present disclosure is a display system comprising a first display device that displays a first virtual image in front of a user riding in a vehicle, and a control unit that controls the first display device, wherein the first display device comprises a display element that emits image light that becomes the first virtual image, and a reflecting unit that reflects the image light from the display element toward the user to form the first virtual image, wherein the display element has a full display area wider than the display area corresponding to the field of view of the reflecting unit, and comprises a first reference area within the full display area, and a second area within the full display area that includes an overlapping area that overlaps at least a part of the first area and a non-overlapping area that extends beyond the first area, and the control unit controls the first display device to switch between a first state in which the first virtual image is formed only in the first area, and a second state in which the first virtual image is formed in the first area and the second area, or in which the first virtual image is formed only in the second area. [Effects of the Invention] 【0007】 According to this disclosure, a display system can be provided that can switch between display modes depending on the situation. [Brief explanation of the drawing] 【0008】 [Figure 1] Figure 1 is a schematic diagram showing the display system according to Embodiment 1 installed in a vehicle. [Figure 2] Figure 2 is a cross-sectional view showing the schematic configuration of the first display device according to Embodiment 1. [Figure 3] Figure 3 is a cross-sectional view showing the schematic configuration of the second display device according to Embodiment 1. [Figure 4] Figure 4 is an explanatory diagram showing the display area of ​​the display element according to Embodiment 1. [Figure 5] Figure 5 is an explanatory diagram showing an example of the display in the first state according to Embodiment 1. [Figure 6] Figure 6 is an explanatory diagram showing an example of the display in the second state according to Embodiment 1. [Figure 7]Figure 7 is an explanatory diagram showing an example of the display during the transition from the first state to the second state according to Embodiment 1. [Figure 8] Figure 8 is an explanatory diagram showing an example of the display of the second state as shown in Modification 1 of Embodiment 1. [Figure 9] Figure 9 is an explanatory diagram showing an example of the display of the second state as shown in modified example 2 of Embodiment 1. [Figure 10] Figure 10 is an explanatory diagram showing an example of the display of the second state as shown in Modification 3 of Embodiment 1. [Figure 11] Figure 11 is an explanatory diagram showing an example of the display of the second state as shown in Modification 4 of Embodiment 1. [Figure 12] Figure 12 is an explanatory diagram showing an example of the display of the second state as shown in Modification 5 of Embodiment 1. [Figure 13] Figure 13 is an explanatory diagram showing an example of the display of the second state as shown in Modification 6 of Embodiment 1. [Figure 14] Figure 14 is an explanatory diagram showing an example of the display of the second state as shown in Modification 7 of Embodiment 1. [Figure 15] Figure 15 is an explanatory diagram showing an example of the display of the second state as shown in Modification 8 of Embodiment 1. [Figure 16] Figure 16 is an explanatory diagram showing another example of the second state shown in Modification 8 of Embodiment 1. [Figure 17] Figure 17 is an explanatory diagram showing an example of the display of the second state as shown in modified example 9 of Embodiment 1. [Figure 18] Figure 18 is a schematic diagram showing the general configuration of the first display device according to a modified example 10 of Embodiment 1. [Figure 19] Figure 19 is a schematic diagram showing the general configuration of the first display device according to a modified example 11 of Embodiment 1. [Figure 20] Figure 20 is a schematic diagram showing a display system according to a modified example 12 of Embodiment 1. [Figure 21] Figure 21 is an explanatory diagram showing an example of a display related to the modified example 12. [Figure 22]FIG. 22 is an explanatory diagram showing changes in the appearance of the first display virtual image in the first switching mode according to Embodiment 1 and the display range on the display element. [Figure 23] FIG. 23 is an explanatory diagram showing the change in the user's viewpoint in the first switching mode according to Embodiment 1. [Figure 24] FIG. 24 is an explanatory diagram showing changes in the appearance of the first display virtual image in the second switching mode according to Embodiment 1 and the display range on the display element. [Figure 25] FIG. 25 is an explanatory diagram showing the change in the user's viewpoint in the second switching mode according to Embodiment 1. [Figure 26] FIG. 26 is an explanatory diagram showing a display example according to Modification Example 13 of Embodiment 1. [Figure 27] FIG. 27 is a schematic diagram showing a state in which the display system according to Embodiment 2 is installed in a vehicle. [Figure 28] FIG. 28 is an explanatory diagram showing an example of the first line-of-sight guidance display according to Embodiment 2. [Figure 29] FIG. 29 is an explanatory diagram showing an example of the second line-of-sight guidance display according to Embodiment 2. [Figure 30] FIG. 30 is an explanatory diagram showing an example of the second line-of-sight guidance display according to Modification Example 1 of Embodiment 2. [Figure 31] FIG. 31 is an explanatory diagram showing an example of the third line-of-sight guidance display according to Modification Example 2 of Embodiment 2. [Figure 32] FIG. 32 is an explanatory diagram showing another example of the third line-of-sight guidance display according to Modification Example 2 of Embodiment 2. [Figure 33] FIG. 33 is an explanatory diagram showing another example of the third line-of-sight guidance display according to Modification Example 2 of Embodiment 2. [Figure 34] FIG. 34 is an explanatory diagram showing an example of the second line-of-sight guidance display according to Modification Example 3 of Embodiment 2. [Figure 35] FIG. 35 is a schematic diagram showing a state in which the display system according to Embodiment 3 is installed in vehicle C1. [Figure 36] FIG. 36 is a schematic cross-sectional view showing the display device according to Embodiment 3. [Figure 37] Figure 37 is a plan view showing the virtual image according to Embodiment 3. [Figure 38] Figure 38 is a plan view showing an example of the display when notification information is generated in the virtual image display according to Embodiment 3. [Figure 39] Figure 39 is a plan view showing a concave mirror according to Embodiment 3. [Figure 40] Figure 40 is a plan view showing a modified example of the concave mirror according to Embodiment 3. [Figure 41A] Figure 41A is a plan view showing a display element according to Embodiment 3. [Figure 41B] Figure 41B is a plan view showing a modified example of the display element according to Embodiment 3. [Figure 42A] Figure 42A is a plan view showing a virtual image according to a modified example 1 of Embodiment 3. [Figure 42B] Figure 42B is a plan view showing a virtual image according to a modified example 1 of Embodiment 3. [Figure 42C] Figure 42C is a plan view showing a virtual image according to a modified example 1 of Embodiment 3. [Figure 43A] Figure 43A is a plan view showing an example of the arrangement of display virtual images according to a modified example 2 of Embodiment 3. [Figure 43B] Figure 43B is a plan view showing an example of the arrangement of display virtual images according to a modified example 2 of Embodiment 3. [Figure 44] Figure 44 is a plan view showing a virtual image according to a modified example 3 of Embodiment 3. [Figure 45] Figure 45 is an explanatory diagram showing the distortion of the virtual image displayed by a concave mirror according to a modified example 3 of Embodiment 3. [Figure 46A] Figure 46A is a schematic diagram showing examples of the central mirror region, one-end mirror region, and other-end mirror region according to a modified example 4 of Embodiment 3. [Figure 46B] Figure 46B is a schematic diagram showing examples of the central mirror region, one-end mirror region, and other-end mirror region according to a modified example 4 of Embodiment 3. [Figure 46C]Figure 46C is a schematic diagram showing examples of the central mirror region, one-end mirror region, and other-end mirror region according to a modified example 4 of Embodiment 3. [Figure 46D] Figure 46D is a schematic diagram showing examples of the central mirror region, one-end mirror region, and other-end mirror region according to a modified example 4 of Embodiment 3. [Figure 47] Figure 47 is an explanatory diagram showing an example of a display according to modified example 5 of Embodiment 3. [Figure 48] Figure 48 is an explanatory diagram showing an example of a display according to modification 6 of Embodiment 3. [Modes for carrying out the invention] 【0009】 (1) A display system according to one aspect of the present disclosure is a display system comprising a first display device that displays a first virtual display image in front of a user riding in a vehicle, and a control unit that controls the first display device, wherein the first display device comprises a display element that emits image light that becomes the first virtual display image, and a reflecting unit that reflects the image light from the display element toward the user to form the first virtual display image, wherein the display element has a full display area wider than the display area corresponding to the field of view of the reflecting unit, and comprises a first reference area within the full display area, and a second area within the full display area that includes an overlapping area that overlaps at least a part of the first area and a non-overlapping area that extends beyond the first area, and the control unit controls the first display device to switch between a first state in which the first virtual display image is formed only in the first area, and a second state in which the first virtual display image is formed in the first area and the second area, or in which the first virtual display image is formed only in the second area. 【0010】 (1) According to the display system described, in the first state, the first display virtual image is displayed only in the first region. On the other hand, in the second state, the first display virtual image is formed in both the first and second regions, or in only the second region. In other words, the region in which the first display virtual image is displayed differs between the first state and the second state. Since the first state and the second state can be switched, the display mode according to the first state and the display mode according to the second state can be switched depending on the situation. 【0011】 (2) In the display system described in (1) above, the second region may extend beyond the first region in at least one direction: upward, downward, to the right, or to the left. 【0012】 (2) According to the display system described, the second region extends beyond the first region in at least one direction: upward, downward, to the right, or to the left. Therefore, the second region can be made wider than the first region in the direction of this extension. 【0013】 (3) In the display system described in (2) above, the second region may be contained within a display region corresponding to the field of view of the reflective portion. 【0014】 (3) According to the display system described above, the second area is contained within the display area corresponding to the field of view of the reflective part, so that the content displayed in the second state can be contained within the display area. 【0015】 (4) In the display system described in (2) above, the size of the second region in at least one of the vertical and horizontal directions may be equivalent to the display region corresponding to the field of view of the reflective portion. 【0016】 (4) According to the display system described above, the size of the second region is equivalent to the display region corresponding to the field of view of the reflective portion in at least one of the vertical and horizontal directions, so that the content displayed in the second state can be contained within the display region while being made as large as possible. 【0017】 (5) In the display system described in (2) above, the size of the second region may extend beyond the display region corresponding to the field of view of the reflective portion in at least one of the vertical and horizontal directions. 【0018】 (5) According to the display system described above, the size of the second region extends beyond the display region corresponding to the field of view of the reflective portion in at least one of the vertical and horizontal directions, so that the content displayed in the second state can be enlarged and displayed within the display region. 【0019】 (6) In the display system described in any one of (1) to (5) above, the control unit may control the first display device to display the speedometer in the first area in the first state and the second state, respectively. 【0020】 (6) According to the display system described, the speedometer is displayed in the first area in both the first and second states, so that the user can understand the speed in both the first and second states. 【0021】 (7) In the display system described in any one of (1) to (6) above, the control unit may control the first display device to display a frame image showing the side mirror frame of the vehicle in the second region in the second state, and to place a rear image showing the rear of the vehicle in the region corresponding to the mirror within the frame image and display it in the second region. 【0022】 (7) According to the display system described, in the second state, the frame image and the background image are displayed in the second area, so that the user can recognize the frame image and the background image. 【0023】 (8) In the display system described in any one of (1) to (6) above, the control unit may control the first display device to display a forward image showing the front of the vehicle in the second area in the second state. 【0024】 (8) According to the display system described, in the second state, the forward image is displayed in the second area, so that the user can perceive the forward image. 【0025】 (9) In the display system described in any one of (1) to (6) above, the control unit may control the first display device to display, in the second state, a pillar image showing the pillar of the vehicle superimposed on a surrounding image captured by a camera positioned outside the pillar in the second region. 【0026】 (9) According to the display system described, in the second state, the pillar image and the surrounding image are superimposed and displayed in the second area, so that the user can distinguish between the pillar image and the surrounding image. 【0027】 (10) In the display system described in any one of (1) to (9) above, the control unit may control the first display device to switch from the first state to the second state based on the fulfillment of a predetermined condition. 【0028】 (10) According to the display system described above, the system switches from the first state to the second state based on the fulfillment of predetermined conditions. This improves visibility for the user by switching to the second state, which is easier to see, and also informs the user that the predetermined conditions have been met by switching from the first state to the second state. 【0029】 (11) In the display system described in any one of (1) to (10) above, the control unit may control the first display device to switch between the first state and the second state by sliding the first display virtual image. 【0030】 (11) According to the display system described above, the first state and the second state are switched by sliding the first display virtual image, so the user can see the sliding display and understand that the switch is in progress. 【0031】 (12) In the display system described in any one of (1) to (11) above, a second display device is provided that displays a second virtual image in front of the user, arranged vertically with respect to the first virtual image, and the control unit controls the first display device and the second display device to display an arrow that spans the first virtual image and the second virtual image. 【0032】 (12) According to the display system described above, an arrow is displayed so as to span the first virtual image and the second virtual image, so that the user's gaze can be guided from the first virtual image to the second virtual image by making the user see the arrow. 【0033】 (13) In the display system described in (12) above, the distance between the first display virtual image and the second display virtual image in a side view of the vehicle may be within 0.25 diopters. 【0034】 (13) According to the display system described above, the distance between the first virtual image and the second virtual image in the side view of the vehicle is within 0.25 diopters, so the amount of focus adjustment (amount of eye focus adjustment) when the user switches their gaze from the first virtual image to the second virtual image can be suppressed. 【0035】 (14) In the display system described in any one of (1) to (13) above, the reflective portion may be provided on the windshield of the vehicle. 【0036】 (14) According to the display system described above, since the reflective part is provided on the windshield, the space consumed by the reflective part can be reduced, and the overall system can be made smaller. 【0037】 (15) In the display system described in any one of (1) to (14) above, a viewpoint detection unit is provided to detect the position of the user's viewpoint, and the control unit controls the first display device to set the system to the second state if the position of the viewpoint detected by the viewpoint detection unit falls within a predetermined range, and to set the system to the first state if the position of the viewpoint detected by the viewpoint detection unit does not fall within a predetermined range. 【0038】 According to the display system described in (15), the system enters the second state when the viewpoint is within a predetermined range, and the system enters the first state when the viewpoint is not within a predetermined range. Therefore, the system can switch between the first and second states depending on the viewpoint's position. 【0039】 (16) In the display system described in (7) above, the control unit may control the first display device to display a guidance mark in the second area that guides the user's gaze toward a warning object included in the rear image. 【0040】 (16) According to the display system described, a guidance mark is displayed in the second area that guides the user's gaze toward the warning target included in the rear image, so that the user can move their gaze toward the warning target by seeing the guidance mark. This allows the user to notice the warning target early. 【0041】 (17) In the display system described in (16) above, the control unit may control the first display device to display the guidance mark so that it gradually approaches the warning target, and to emphasize the guidance mark as the distance between the vehicle and the warning target decreases. 【0042】 (17) According to the display system described, guidance marks are displayed so that the vehicle gradually approaches the warning target, and the guidance marks can be represented in an animated manner, making them easier for the user to notice. Furthermore, the guidance marks are emphasized as the vehicle gets closer to the warning target, so the user can also be informed that the vehicle is getting closer to the warning target. 【0043】 (18) In the display system described in (17) above, the control unit may control the first display device to return the guidance mark to its initial position when the guidance mark approaches the warning target, and then display the guidance mark again so that it approaches the warning target. 【0044】 (18) According to the display system described, the guidance mark returns to its initial position when approaching the warning target and is displayed again to guide the user towards the warning target, so the guidance mark repeats the action of moving towards the warning target. Therefore, it is possible to make the guidance mark more noticeable to the user. 【0045】 (19) A display system according to any one of (1) to (18) above, comprising: a second display device that displays a second display image in front of the user and above the first display image; and an imaging unit that images the area around the vehicle, wherein the control unit controls the second display device and the imaging unit, and the control unit controls the first display device to display vehicle surrounding information obtained by the imaging unit on the first display image, and controls the second display device to display first guidance information that encourages eye movement towards the first display image on the second display image, and then controls the first display device to display second guidance information that encourages eye movement towards the front of the vehicle on the first display image. 【0046】 According to the display system described in (19), vehicle surrounding information is displayed on the first display virtual image, and first guidance information that encourages eye movement towards the first display virtual image is displayed on the second display virtual image, after which second guidance information that encourages eye movement towards the front of the vehicle is displayed on the first display virtual image. In this way, since the second guidance information is displayed on the first display virtual image, the user will shift their gaze to the front of the vehicle after seeing the second guidance information. Therefore, prolonged viewing of the first display virtual image is suppressed, and the stability of safety confirmation actions can be improved. 【0047】 (20) In the display system described in (19) above, when the control unit displays the second guidance information on the first display virtual image, it may control the second display device to display a third guidance information on the second display virtual image that promotes the vehicle's gaze forward. 【0048】 According to the display system described in (20), when the second guidance information is displayed on the first display virtual image, the third guidance information, which encourages the user's gaze to move forward, is also displayed on the second display virtual image. Therefore, the second guidance information and the third guidance information together can further guide the user's gaze forward. This makes it possible to further improve the stability of safety confirmation actions. 【0049】 (21) In the display system described in (19) above, the control unit may control the second display device to display the third guidance information on the second display virtual image so that the gaze is guided to a warning target located in front of the vehicle. 【0050】 (21) According to the display system described above, third guidance information is displayed on the second display virtual image so that the user's gaze is guided to the warning target located in front of the vehicle. Thus, the third guidance information can guide the user's gaze to the warning target. This makes it possible to further improve the stability of safety confirmation operations. 【0051】 (22) In the display system described in (20) or (21) above, the control unit may control the second display device to display text information that assists in eye-tracking guidance, along with the third guidance information, on the second display virtual image. 【0052】 (22) According to the display system described, text information that assists in eye-tracking is displayed on the second display virtual image along with the third guidance information, so that the user can more easily move their gaze to the warning target by viewing the third guidance information and the text information. 【0053】 (23) In the display system described in any one of (20) to (22) above, the control unit may control the second display device to highlight the edge of the second display virtual image as the third guidance information. 【0054】 (23) According to the display system described above, the edges of the second display virtual image are highlighted as third guidance information, so that the user can move their gaze to the warning target by seeing the highlighted area. 【0055】 (24) In the display system described in any one of (19) to (23) above, the control unit may, when displaying the second guidance information on the first display virtual image, control the first display device so as not to display the vehicle surrounding information on the first display virtual image. 【0056】 (24) According to the display system described above, when the second guidance information is displayed on the first display virtual image, the vehicle surroundings information is not displayed on the first display virtual image, making it easier for the user to concentrate on the second guidance information. 【0057】 (25) In the display system described in any one of (20) to (23) above, the control unit may, when displaying at least one of the second guidance information and the third guidance information, control the first display device to also display the vehicle surrounding information on the first display virtual image. 【0058】 (25) According to the display system described above, when at least one of the second guidance information and the third guidance information is displayed, the vehicle surrounding information is also displayed in the first display virtual image. Therefore, the user can move their gaze based on at least one of the second guidance information and the third guidance information while checking the vehicle surrounding information. 【0059】 (26) In the display system described in any one of (19) to (25) above, the control unit may, based on the vehicle surrounding information, determine that a warning target located in front of the vehicle is not in a blind spot for the user, control the first display device to prevent the vehicle surrounding information from being displayed on the first display virtual image. 【0060】 According to the display system described in (26), if it is determined that a warning target located in front of the vehicle is not in the user's blind spot, the vehicle surrounding information will not be displayed in the first display illusion, thereby preventing the unintentional display of vehicle surrounding information in the first display illusion. This allows the user to concentrate on viewing the area in front of the vehicle. 【0061】 (27) In the display system described in any one of (19) to (25) above, the control unit may control the first display device to prevent the vehicle surrounding information from being displayed on the first display virtual image when the vehicle speed exceeds a certain speed. 【0062】 (27) According to the display system described above, when the vehicle speed exceeds a certain speed, the vehicle's surroundings information is not displayed on the first display virtual image. Therefore, in situations where the driver must concentrate on driving (such as during high-speed driving), the vehicle's surroundings information is not displayed on the first display virtual image. In other words, the user can concentrate on visually inspecting the area in front of the vehicle. 【0063】 (28) In the display system described in any one of (19) to (25) above, the control unit may control the first display device to prevent the vehicle surrounding information from being displayed on the first display virtual image when the display time of the vehicle surrounding information exceeds a certain period of time. 【0064】 (28) According to the display system described above, if the display time of the vehicle surrounding information exceeds a certain period of time, the vehicle surrounding information will not be displayed on the first display virtual image, thereby preventing the vehicle surrounding information from being displayed on the first display virtual image for an extended period of time. This allows the user to concentrate on viewing the area in front of the vehicle. 【0065】 (29) In the display system described in any one of (1) to (28) above, in the first display virtual image, the first height in the central region in the width direction of the vehicle is different from the second heights of the one end region and the other end region in the width direction of the vehicle. 【0066】 According to the display system described in (29), since the first height of the central region and the second heights of the one-end region and the other-end region of the first display virtual image are different, the virtual image displayed in the central region and the virtual images displayed in the one-end region and the other-end region can be recognized by the user as separate virtual images. In other words, the first display virtual image projected by one first display device can be recognized by the user as multiple virtual images, thereby suppressing the overall size of the system. Furthermore, since the virtual image displayed in the central region and the virtual images displayed in the one-end region and the other-end region are contained within the first display virtual image, the user's eye movement and focus adjustment are also reduced. Moreover, since the first height of the central region and the second heights of the one-end region and the other-end region of the first display virtual image are different, compared to the case where the entire display area is rectangular, it becomes easier for the user to distinguish and grasp the first display virtual image displayed in the one-end region and the other-end region from the central region, and the user's field of view is less likely to be obstructed. Therefore, the psychological burden on the user can also be reduced. As a result, a display system can be provided that reduces the burden on the user while suppressing the overall size of the system. 【0067】 (30) In the display system described in (29) above, the control unit may control the first display device such that a side image showing the side of the vehicle is displayed in the one-end region and the other-end region of the first display virtual image. 【0068】 (30) According to the display system described above, a side view image showing the side of the vehicle is displayed in each of the one-end and the other-end regions, so that the side view image can be displayed as a virtual image and recognized by the user. 【0069】 (31) In the display system described in (29) or (30) above, the second height may be greater than the first height. 【0070】 According to the display system described in (31), since the second height is greater than the first height, when displaying a lateral image in one end region and the other end region, the lateral image can be displayed larger in the height direction. This allows the user to easily view the lateral image. 【0071】 (32) In the display system described in any one of (29) to (30) above, the length in the vehicle width direction of the one-end region and the other-end region of the first display virtual image may be greater than the length in the vehicle width direction of the central region. 【0072】 According to the display system described in (32), the lengths in the vehicle width direction of the one-end region and the other-end region of the first display virtual image are greater than the length in the vehicle width direction of the central region. Therefore, when a lateral image is displayed in the one-end region and the other-end region, the lateral image can be displayed larger in the vehicle width direction. This allows the user to easily view the lateral image. 【0073】 (33) In the display system described in any one of (29) to (32) above, one of the one-end region and the other-end region of the first display virtual image may be further away from the center in the vehicle width direction of the user than the other. 【0074】 According to the display system described in (33), one of the one-end region and the other-end region in the first display virtual image is further from the center in the user's vehicle width direction than the other, so that the display appears biased to the user. In other words, the one-end region and the other-end region can be positioned appropriately for each vehicle, depending on whether it is a left-hand drive or right-hand drive vehicle. 【0075】 (34) In the display system described in any one of (29) to (33) above, the one-end region and the other-end region of the first display virtual image may overlap with a horizontal line passing through the height center of the central region. 【0076】 According to the display system described in (34), since the one-end region and the other-end region of the first display virtual image overlap with a horizontal line passing through the height center of the central region, the user's gaze can move in a straight line when viewing the entire first display virtual image, thereby reducing the burden on the user. 【0077】 (35) In the display system described in (34) above, the one-end region and the other-end region of the first display virtual image may protrude downward from the central region. 【0078】 According to the display system described in (35), one end region and the other end region of the first display virtual image protrude downward from the central region. By placing the steering wheel between the parts of the one end region and the other end region that protrude downward from the central region, that is, in the non-display region, it is possible to suppress the steering wheel from obstructing the first display virtual image. 【0079】 (36) In the display system described in (35) above, the lower end of the first display virtual image may be shaped to conform to the upper shape of the steering wheel provided in the vehicle. 【0080】 According to the display system described in (36), the lower end of the first virtual image is shaped to conform to the upper shape of the steering wheel, so that the area obstructed by the steering wheel can be suppressed, and the first virtual image can be made as large as possible. 【0081】 (37) In the display system described in any one of (29) to (36) above, the first display device comprises a display element that forms an image light that becomes the first display virtual image, and an optical system that reflects the image light emitted from the display element to form the first display virtual image, wherein the final reflective surface of the optical system is a concave mirror, and in the concave mirror, the height of the first mirror in the central mirror region in the vehicle width direction is different from the height of the second mirror in the one-end mirror region and the other-end mirror region in the vehicle width direction. 【0082】 According to the display system described in (37), in a concave mirror, the height of the first mirror in the central mirror region is different from the height of the second mirror in the one-end mirror region and the other-end mirror region. Therefore, the shape of the first display virtual image can be realized by the shape of the concave mirror without employing any special display elements. 【0083】 (38) In the display system described in (37) above, the upper end of the concave mirror may be curved in a convex shape. 【0084】 The image light from the display element is distorted by reflecting off the concave mirror, but if the upper end of the concave mirror is curved in a convex shape, as in the display system described in (38), the concave mirror can be made with a shape that takes this distortion into account. 【0085】 (39) In the display system described in (37) or (38) above, the concave mirror may be divided into a central mirror region, a one-end mirror region, and a other-end mirror region. 【0086】 (39) According to the display system described above, the central mirror region, the one-end mirror region, and the other-end mirror region are separated, making it easier to manufacture compared to the case where the concave mirror is a single integrated unit. 【0087】 (40) In the display system described in (39) above, the central mirror region, the one-end mirror region, and the other-end mirror region may be held by a single holding member. 【0088】 According to the display system described in (40), the central mirror region, the one-end mirror region, and the other-end mirror region are each held by a single holding member, so that the central mirror region, the one-end mirror region, and the other-end mirror region can be held stably and deviations of the optical axis in each region can be suppressed. 【0089】 (41) In the display system described in (39) or (40) above, the curvature of the one-end mirror region and the other-end mirror region may be greater than the curvature of the central mirror region. 【0090】 (41) According to the display system described above, since the curvature of the one-end mirror region and the other-end mirror region are greater than the curvature of the central mirror region, the one-end region and the other-end region in the first display virtual image can be made larger than the central region. 【0091】 (42) In the display system described in any one of (39) to (41) above, the concave mirror may be provided on the windshield of the vehicle. 【0092】 According to the display system described in (42), since the concave mirror is provided in the windshield, the windshield can be used as part of the optical system, and the overall system can be made smaller. 【0093】 (43) In the display system described in any one of (29) to (42) above, the first display device may include a display element that forms an image light that becomes the first display virtual image, and an optical system that reflects the image light emitted from the display element to form the first display virtual image, wherein the display element is divided into a central element corresponding to the central region of the first display virtual image, and a pair of end elements corresponding to the one end region and the other end region of the first display virtual image. 【0094】 According to the display system described in (43), the display element is divided into a central element corresponding to the central region of the first virtual image and a pair of end elements corresponding to one end region and the other end region of the first virtual image. Therefore, a central element with a simple external shape and a pair of end elements can be used. 【0095】 (44) In the display system described in any one of (29) to (43) above, the control unit may control the first display device so that, during normal driving, an instrument image is displayed in each of the one-end region and the other-end region of the first display virtual image, and when notification information is generated, the control unit may control the first display device so that a side image showing the side of the vehicle is displayed in each of the one-end region and the other-end region of the first display virtual image. 【0096】 According to the display system described in (44), during normal driving, instrument images are displayed in the one-end region and the other-end region of the first display virtual image, and when notification information is generated, side images are displayed in the one-end region and the other-end region of the first display virtual image, thus suppressing the inconvenience of having side images displayed in the one-end region and the other-end region during normal driving. 【0097】 (45) In the display system described in any one of (29) to (43) above, the control unit may control the first display device so that, during normal driving, the one-end region and the other-end region of the first display virtual image are each turned OFF, and when notification information is generated, the control unit may control the first display device so that a side image showing the side of the vehicle is displayed in the one-end region and the other-end region of the first display virtual image. 【0098】 (45) According to the display system described above, during normal driving, both the one-end region and the other-end region of the first display virtual image are turned OFF, thus suppressing the inconvenience of virtual images being displayed in the one-end region and the other-end region during normal driving. 【0099】 (46) In the display system described in any one of (29) to (43) above, the control unit may control the first display device such that a side image showing the side of the vehicle is displayed in the one-end region and the other-end region of the first display virtual image, and a rear image showing the rear of the vehicle is displayed in the central region. 【0100】 (46) According to the display system described above, a side image showing the side of the vehicle is displayed in one end region and the other end region of the first display virtual image, and a rear image is displayed in the central region. This allows the side image and rear image to be displayed in a list, and enables the user to grasp them all at once. 【0101】 (47) In the display system described in any one of (29) to (43) above, the control unit may control the first display device such that the lateral image, as viewed from the positions of the one-end region and the other-end region of the first display virtual image, is displayed in the one-end region and the other-end region. 【0102】 (47) According to the display system described above, the lateral image viewed from the position of one end region and the other end region of the first display virtual image is displayed in the one end region and the other end region, so that a lateral image that is less unnatural to the user can be displayed. 【0103】 (48) In the display system described in any one of (29) to (43) above, the control unit may control the first display device such that an interior image that mimics the interior of the vehicle is superimposed on the side image in a semi-transparent state. 【0104】 (48) According to the display system described above, a semi-transparent interior image is superimposed on the side image, allowing the user to intuitively understand the positional relationship between the warning object included in the side image and the interior. 【0105】 (Embodiment) The embodiments will be described in detail below with reference to the drawings. Note that the embodiments described below are all specific examples of this disclosure. The numerical values, shapes, materials, components, arrangement and connection configurations of components, steps, and the order of steps shown in the following embodiments are examples only and are not intended to limit this disclosure. Furthermore, among the components in the following embodiments, those not described in the independent claim representing the highest-level concept will be described as optional components. 【0106】 The optical paths illustrated in the figures of the following embodiments are intended to illustrate the fundamental concept and do not necessarily reflect actual optical paths. 【0107】 <Embodiment 1> Figure 1 is a schematic diagram showing the display system 10 according to Embodiment 1 installed in a vehicle 1. In Figure 1, the vehicle 1 is shown in cross-section. As shown in Figure 1, the display system 10 comprises a first display device 100, a second display device 200, and a control unit 500. The first display device 100 is located inside the dashboard of the vehicle 1, and the second display device 200 is located below the first display device 100. The second display device 200 may be located inside or outside the dashboard. The first display device 100 and the second display device 200 project vehicle information relating to the vehicle 1 as a first display virtual image 101 and a second display virtual image 201, respectively. Examples of vehicle information include the vehicle speed of the vehicle 1, the engine speed, the detection results of objects approaching the vehicle 1, or navigation information from the vehicle 1's current location to its destination. 【0108】 [First display device] As shown in Figure 1, the first display device 100 projects image light toward the driver. The driver perceives the image light that enters their eyes as the first virtual image 101 projected in the distance from the first display device 100. Thus, the first display device 100 is an example of a first display device that projects a virtual image toward the driver. 【0109】 Figure 2 is a cross-sectional view showing the schematic configuration of the first display device 100 according to Embodiment 1. As shown in Figure 2, the first display device 100 includes a display element 130 and a reflective section 140. 【0110】 The display element 130 is, for example, a liquid crystal panel, and when light from a light source (not shown) is shone upon it, it displays an image that forms the basis of the first virtual display image 101, and shines the image light of the said image toward the reflector 140. The display element 130 may also be an organic EL panel. The display element 130 is positioned so that its display surface faces forward of the vehicle 1. 【0111】 The reflective section 140 is positioned in front of the display element 130 and reflects the image light emitted from the display element 130 to form the first virtual display image 101. The reflective section 140 is, for example, a concave mirror and is positioned to reflect the image light emitted from the display element 130 toward the driver. In other words, the image light reflected by the reflective section 140 is directed toward the eyes of the driver sitting in the driver's seat and becomes the first virtual display image 101. Figure 1 illustrates the position of the first virtual display image 101 as seen from the driver's viewpoint. This position can be set by adjusting the viewing distance of the image light emitted from the display element 130 of the first display device 100. The viewing distance is the distance from the driver's viewpoint to the image formation position of the virtual image (for example, the first virtual display image 101). The driver's viewpoint is, for example, a reference eye point. A reference eye point is "a point that represents the position of the driver's eyes in a normal driving state." The standard eye point varies depending on the driver's physique and posture, but even if the standard eye point changes, the range within which most standard eye points are contained is called the eye box I of vehicle 1. The eye box I is a virtual three-dimensional region. 【0112】 [Second display device] The second display device 200 is an AR-HUD (Augmented Reality Head-up Display). The second display device 200 projects image light onto the windshield 2 of the vehicle 1. The projected image light is reflected by the windshield 2. This reflected light is directed towards the eyes of the driver, who is seated in the driver's seat. 【0113】 The driver perceives the reflected light that enters their eyes as a second virtual image 201, which is visible on the opposite side of the windshield 2 (outside the vehicle), with actual objects visible through the windshield 2 as the background. In this way, the second display device 200 projects a virtual image in front of the driver who is seated in the vehicle 1. Specifically, the second display device 200 projects the second virtual image 201 in front of the driver and above the first virtual image 101. 【0114】 Figure 3 is a cross-sectional view showing the schematic configuration of the second display device 200 according to Embodiment 1. As shown in Figure 3, the second display device 200 comprises a housing 210, a cover portion 220, a display element 230, a first optical element 240, and a second optical element 250. 【0115】 The housing 210 is a box-shaped body made of light-shielding resin or metal. Specifically, the housing 210 has a roughly rectangular parallelepiped shape, with an opening 211 formed at its top. The opening 211 is closed by a cover portion 220. The internal space of the housing 210 and the cover portion 220 houses the display element 230, the first optical element 240, and the second optical element 250. 【0116】 The cover portion 220 is a curved plate made of, for example, a translucent resin or glass. Specifically, the cover portion 220 has a shape that is convex downwards as a whole. 【0117】 The display element 230 is, for example, a liquid crystal panel. When light from a light source (not shown) is shone on the display element 230, it displays an image that forms the basis of the second display virtual image 201 and shines the image light of the said image onto the first optical element 240. The display element 230 may also be an organic EL panel. The display element 230 is formed in a rectangular shape in plan view and is arranged in a position tilted with respect to the horizontal plane. 【0118】 The first optical element 240 is positioned on the optical path of the image light emitted from the display element 230 and is an optical element that reflects the image light toward the second optical element 250. The first optical element 240 is a convex mirror formed in a rectangular shape in plan view. The first optical element 240 is positioned at an angle to the vertical plane. The reflective surface of the first optical element 240 faces the display element 230 and the second optical element 250. 【0119】 The second optical element 250 is positioned on the optical path of the image light that has passed through the first optical element 240, and reflects the image light reflected by the first optical element 240 toward the aperture 211. Specifically, the second optical element 250 is a concave mirror formed in a rectangular shape in plan view. The second optical element 250 is positioned opposite the reflective surface side of the first optical element 240 and tilted with respect to the vertical plane of the housing 210. The reflective surface of the second optical element 250 faces the first optical element 240 and the cover portion 220. The image light reflected by the second optical element 250 is projected onto the windshield 2 through the aperture 211. This reflection directs the image light toward the eyes of the driver sitting in the driver's seat, forming the second display virtual image 201. Figure 1 illustrates the position of the second display virtual image 201 as seen from the driver's viewpoint. This position can be set by adjusting the viewing distance of the image light emitted from the display element 230 of the second display device 200. 【0120】 Here, as shown in Figure 1, the distance D between the first virtual image 101 and the second virtual image 201 in the side view of vehicle 1 should be within 0.25 diopters. A diopter is defined as the absolute value of the difference between the reciprocal of the distance from the viewpoint position to the first virtual image 101 and the reciprocal of the distance from the viewpoint position to the second virtual image 201. Since the distance between the first virtual image 101 and the second virtual image 201 is within 0.25 diopters, the amount of focus required when the driver switches their gaze from the first virtual image 101 to the second virtual image 201 can be further suppressed. 【0121】 [Control Unit] As shown in Figure 1, the control unit 500 is electrically connected to the first display device 100 and the second display device 200, and controls them. Specifically, the control unit 500 is equipped with a CPU, RAM, ROM, etc., and the CPU executes each process by loading the program in ROM into RAM and executing it. 【0122】 The control unit 500 is connected to an imaging unit 3, which is installed in the vehicle 1 and captures images of the area around the vehicle 1, via wired or wireless communication. The imaging unit may also be installed in the display system 10. 【0123】 The imaging unit includes a front camera that photographs the front of vehicle 1, a rear camera that photographs the rear of vehicle 1, a right rear camera that photographs the right rear of vehicle 1, a left rear camera that photographs the left rear of vehicle 1, a right side camera that photographs the right side of vehicle 1, and a left side camera that photographs the left side of vehicle 1. The image captured by the front camera is included in the front image. The images captured by the rear camera (rear image), the right rear camera (right rear image), and the left rear camera (left rear image) are all included in the rear image, which shows the rear of vehicle 1. The images captured by the right side camera (right side image) and the left side camera (left side image) are all included in the side image, which shows the side of vehicle 1. 【0124】 The control unit 500 controls the first display device 100 to display at least a portion of the front image, rear image, and side image, along with vehicle information, within the first virtual display image 101. 【0125】 Meanwhile, the control unit 500 controls the second display device 200 to display the vehicle speed of vehicle 1, navigation information, etc., within the second virtual display image 201. The navigation information includes arrows to guide the direction of travel and warning marks to indicate the occurrence of a warning target. 【0126】 [Example Display] Here, the control unit 500 can also switch between the first state and the second state when displaying the first virtual image 101 on the first display device 100. The area used by the display element 130 is different between the first state and the second state. 【0127】 Figure 4 is an explanatory diagram showing the display area of ​​the display element 130 according to Embodiment 1. As shown in Figure 4, the rectangular dot hatching area indicates the entire display area 131 of the display element 130. Within the entire display area 131, the display area 141 corresponding to the field of view of the reflective part 140 is shown by a dashed line. The display area 141 is rectangular, smaller than the entire display area 131, and has the same center position as the entire display area 131. 【0128】 Furthermore, within the entire display area 131, a reference first area R1 is set so that it fits within the display area 141. The first area R1 is shown by a dashed line in Figure 4, and is smaller than the display area 141 and has the same center position as the display area 141. In the first state, only the first area R1 emits light, which is reflected by the display area 141, and the first display virtual image 101 is formed. 【0129】 If only this first region R1 emits light and forms the first display virtual image 101, then the entire first display virtual image 101 is visible from the driver's viewpoint inside the eye box I. On the other hand, even if an image is displayed in the entire display region 131, even if an image is displayed in the part outside the display region 141, the light from that image does not reach the driver's viewpoint inside the eye box I and is therefore not visible to the driver. 【0130】 Figure 5 is an explanatory diagram showing an example of the display in the first state according to Embodiment 1. In Figure 5, the outlines of the entire display area 131, the display area 141, and the first area R1 are shown, but these are not actually displayed. As shown in Figure 5, in the first state, the speedometer G11 is displayed on the left side of the first area R1, the tachometer G12 is displayed on the right side, and the vehicle image G13 is displayed in the center. This display example is projected in front of the driver as the first virtual display image 101, but from the driver's viewpoint located inside the eye box I, the entire first virtual display image 101 is visible. 【0131】 Figure 6 is an explanatory diagram showing an example of display in the second state according to Embodiment 1. In Figure 6, the outlines of the entire display area 131, display area 141, first area R1, and second area R2 are shown, but these are not actually displayed. As shown in Figure 6, in the second state, the first display virtual image 101 is formed by the first area R1 and the second area R2. The second area R2 is shown by a dashed line in Figure 6. Here, the second area R2 comprises an overlapping area R21 that overlaps at least a part of the first area R1, and a non-overlapping area R22 that extends beyond the first area R1. The overlapping area R21 overlaps approximately the left half of the first area R1. The non-overlapping area R22 extends beyond the first area R1 in at least one direction: upward, downward, to the right, or to the left. Specifically, the non-overlapping area R22 extends beyond the first area R1 in the upward, downward, and left directions. The second area R2 is contained within the display area 141. 【0132】 In the display example shown in Figure 6, the speedometer G11 is displayed on the right side of the first region R1, and the frame image G15 and the rear view image G16 are displayed in the second region R2. Specifically, the frame image G15 is an image showing the side mirror frame of the vehicle 1. The frame image G15 is formed from CG images, illustrations, and photographic images obtained by actually photographing the side mirror frame. Part of the frame image G15 is also displayed in the non-overlapping region R22, and is displayed larger vertically than in the first region R1. The rear view image G16 is a rear view image of the vehicle 1 taken with the side mirror frame as the reference point, and is contained within the region corresponding to the mirror in the frame image G15. Thus, in the second state, the frame image G15 is displayed larger vertically than in the first region R1, so the driver can intuitively grasp that the display has switched to the second state without having to carefully check the display contents. Furthermore, compared to displaying the entire frame image G15 only in the first region R1, the rear image G16 can be displayed larger, making it easier for the driver to see the rear image G16. 【0133】 Here, the control unit 500 controls the first display device 100 to switch from the first state to the second state based on whether predetermined conditions are met. The predetermined conditions include when the speed of the vehicle 1 is above or below a predetermined speed, when the distance between the vehicle 1 and the warning target is below a predetermined distance, and when the switch button is operated by the driver. To detect when the distance between the vehicle 1 and the warning target is below a predetermined distance, for example, the distance between the warning target included in the images and the vehicle 1 can be detected by image processing of the front image, rear image, and side image obtained by the imaging unit 3. Furthermore, the distance between the vehicle 1 and the warning target can also be detected by distance measuring sensors such as radar and LiDAR installed in the vehicle 1. 【0134】 Furthermore, the control unit 500 controls the first display device 100 to switch between the first state and the second state by sliding the first display virtual image 101. Figure 7 is an explanatory diagram showing an example of the display in the process of switching from the first state to the second state according to Embodiment 1. The control unit 500 controls the first display device 100 to slide the display example of the first state shown in Figure 5 to the right, so that the frame image G15 and the background image G16 gradually enter the second region R2 from the left end, as shown in Figure 7. As this gradually progresses, the display becomes the second state as shown in the display example in Figure 6. 【0135】 [Effects, etc.] As described above, according to the above embodiment, in the first state, the first display virtual image 101 is displayed only in the first region R1. On the other hand, in the second state, the first display virtual image is formed in both the first region R1 and the second region R2. In other words, the region in which the first display virtual image 101 is displayed is different between the first state and the second state. Since the first state and the second state can be switched, the display mode according to the first state and the display mode according to the second state can be switched depending on the situation. 【0136】 In the second state, the first virtual display image 101 may be formed only in the second region R2 without displaying the speedometer G11 excluding the digital display. 【0137】 Furthermore, since the second region R2 extends beyond the first region R1 in at least one direction—upward, downward, rightward, or leftward—the second region R2 can be made to cover a wider area than the first region R1 in the direction of this extension. 【0138】 Furthermore, since the second region R2 is contained within the display region 141 corresponding to the field of view of the reflective section 140, the content displayed in the second region R2 can be contained within the display region 141. 【0139】 Furthermore, since the speedometer G11 is displayed in the first region R1 in both the first and second states, the driver can be made aware of the speed in both the first and second states. 【0140】 Furthermore, in the second state, the frame image G15 and the rear image G16 are displayed in the second region R2, allowing the driver to understand the frame image G15 and the rear image G16. 【0141】 Furthermore, since the system switches from the first state to the second state based on the fulfillment of predetermined conditions, visibility is improved for the driver by switching to the more visible second state, and the system also informs the driver that the predetermined conditions have been met by switching from the first state to the second state. 【0142】 Furthermore, since the first display virtual image 101 can be slid to switch between the first and second states, the driver can see the sliding display and understand that a switch is in progress, thus maintaining the visibility of the speedometer. 【0143】 Furthermore, since the distance between the first virtual image 101 and the second virtual image 201 in the side view of vehicle 1 is within 0.25 diopters, the amount of focus adjustment (amount of eye focus adjustment) when the driver switches their gaze from the first virtual image 101 to the second virtual image 201 can be suppressed. 【0144】 [Example 1] Modification 1 will now be described. In the following description, parts identical to those in the above embodiment or other modifications may be denoted by the same reference numerals and their descriptions may be omitted. 【0145】 Figure 8 is an explanatory diagram showing an example of the display of the second state as shown in Modification 1 of Embodiment 1. As shown in Figure 8, the second region R2a is formed to be larger in the vertical direction than the second region R2 shown in Figure 6. Specifically, the size of the second region R2a is equivalent to the display area 141 corresponding to the field of view of the reflective part 140 in the vertical direction. In this way, since the size of the second region R2a is equivalent to the display area 141 in the vertical direction, the content displayed in the second state can be made as large as possible while still fitting within the display area 141. Note that the size of the second region R2a may also be equivalent to the display area 141 in the horizontal direction. 【0146】 [Differentiation 2] Modification 2 will now be described. Figure 9 is an explanatory diagram showing an example of the display of the second state shown in Modification 2 of Embodiment 1. As shown in Figure 9, the second region R2b is formed to be larger in the vertical and horizontal directions than the second region R2a shown in Figure 8. Specifically, the size of the second region R2b extends beyond the display area 141 corresponding to the field of view of the reflective part 140 in the vertical and horizontal directions. In Figure 9, the portion that extends beyond the display area 141 is shown blurred. This portion that extends beyond the display area 141 is not visible from the driver's viewpoint located inside the eye box I, but if the driver changes their posture and the driver's viewpoint moves outside the eye box I, that portion may be visible. 【0147】 Thus, since the size of the second region R2b extends beyond the display region 141 in at least one of the vertical and horizontal directions, the content displayed in the second state can be enlarged and displayed within the display region 141. 【0148】 [Difference 3] Modification 3 will now be described. Figure 10 is an explanatory diagram showing an example of the display of the second state shown in Modification 3 of Embodiment 1. In the display example shown in Figure 10, the frame image G15 and the rear image G16 are displayed enlarged within the second region R2d compared to the display example shown in Figure 9. In this case, since most of the second region R2d is the rear image G16, the driver can more easily grasp the contents of the rear image G16. 【0149】 [Differentiation Example 4] Modification 4 will now be described. Figure 11 is an explanatory diagram showing an example of the display of the second state shown in Modification 4 of Embodiment 1. As shown in Figure 11, the second region R2d extends beyond the left and right ends of the first region R1, and is smaller than the first region R1 in the vertical direction. In Modification 4, the control unit 500 controls the first display device 100 to display the forward image G17 and the speedometer G18 in the second region R2d. In this way, in the second state, the forward image G17 is displayed in the second region R2d, which is larger in the left and right direction than the first region R1, so that the driver can be aware of the warning target (motorcycle) that is difficult for the driver to see directly at intersections with poor visibility. 【0150】 [Difference 5] Modification 5 will now be described. Figure 12 is an explanatory diagram showing an example of the display of the second state shown in Modification 5 of Embodiment 1. As shown in Figure 12, the size of the second region R2e is larger than that of the first region R1 in both the vertical and horizontal directions. In other words, since the second region R2e is larger than the second region R2d shown in Figure 11, the forward image G17 displayed in the second region R2e can be displayed on a larger scale. 【0151】 [Modification 6] Modification 6 will now be described. Figure 13 is an explanatory diagram showing an example of the display of the second state shown in Modification 6 of Embodiment 1. As shown in Figure 13, the second region R2f extends beyond the left and right ends of the first region R1, and is smaller than the first region R1 in the vertical direction. In Modification 6, the control unit 500 controls the first display device 100 to display the forward image G19 and the hood frame image G20 showing the hood superimposed. The hood frame image G20 is highlighted (brightness increased, blurring to relatively highlight the image within the hood frame, etc.). In this case, the warning target that is obscured by the hood is displayed as the forward image G19 to the driver, so that the driver can recognize the warning target. 【0152】 [Difference 7] Modification 7 will now be described. Figure 14 is an explanatory diagram showing an example of the display of the second state shown in Modification 7 of Embodiment 1. Figure 14(a) shows the case where the forward image G21 obtained by imaging is larger in the left-right direction than the second region R2g if left as is. In this case, the control unit 500 compresses only the portion of the forward image G21 that extends beyond the display region 141 corresponding to the field of view of the reflective section 140 (both left and right ends) in the left-right direction, so that it fits into the second region R2g as shown in Figure 14(b). Although compression in the left-right direction has been illustrated here, the same applies to the up-down direction. 【0153】 [Differentiation 8] Modification 8 will now be described. Figure 15 is an explanatory diagram showing an example of the display of the second state shown in Modification 8 of Embodiment 1. In Figure 15, the first display virtual image 101h and the second display virtual image 201h are shown side by side. The control unit 500 controls the first display device 100 and the second display device 200 to display the arrow Yh so as to span the first display virtual image 101h and the second display virtual image 201h. The arrow Yh is an arrow that points to the warning target, and by viewing this arrow Yh, the driver's gaze is guided to recognize the warning target (motorcycle) included in the forward image G17. In this way, since the arrow Yh is displayed so as to span the first display virtual image 101h and the second display virtual image 201h, the driver's gaze can be guided from the first display virtual image 101h to the second display virtual image 201h by having the driver view the arrow Yh. Figure 16 is an explanatory diagram showing another example of the display of the second state shown in Modification 8. As shown in Figure 16, the first virtual image 101i may display the speedometer G11. 【0154】 [Modification 9] Modification 9 will now be described. Figure 17 is an explanatory diagram showing an example of the display of the second state shown in Modification 9 according to Embodiment 1. As shown in Figure 17, the second region R2j extends beyond the first region R1 in the vertical and right directions. In Modification 7, the control unit 500 controls the first display device 100 to display a pillar image G23, which shows the pillar of the vehicle 1, in the second region R2j, superimposed on a surrounding image G24 captured by a camera positioned outside the pillar. The pillar image G23 may be semi-transparent, and warning targets overlapping the pillar may be displayed so that they are visible to the driver. In this way, in the second state, the pillar image G23 and the surrounding image G24 are superimposed and displayed in the second region R2j, so that the driver can perceive the pillar image G23 and the surrounding image G24. 【0155】 [Example 10] Modification 10 will now be described. Figure 18 is a schematic diagram showing the general configuration of the first display device 100k according to Modification 10 of Embodiment 1. As shown in Figure 18, the first display device 100k comprises a display element 130k and an optical system 190k. The display element 130k is positioned to emit image light upwards. The optical system 190k comprises a first reflector 191k, a second reflector 192k, and a light-transmitting cover 193k, which guide the image light from the display element 130k to the driver's eyes (eye box I). The first reflector 191k is a planar mirror positioned above the display element 130k, which reflects the image light from the display element 130k toward the second reflector 192k. The second reflector 192k is a concave mirror positioned in front of the display element 130k and the first reflector 191k, which reflects the image light reflected by the first reflector 191k toward the driver. The light-transmitting cover 193k is a glass cover positioned behind the second reflecting section 192k. The image light reflected by the second reflecting section 192k passes through the light-transmitting cover 193 and is directed towards the driver, becoming the first display virtual image 101k. This configuration increases the optical path length, allowing the first display virtual image 101k to be viewed from a greater distance. 【0156】 [Example 11] Modification 11 will now be described. Figure 19 is a schematic diagram showing the general configuration of the first display device 100m according to Modification 11 of Embodiment 1. As shown in Figure 19, the first display device 100m comprises a display element 130m and a reflective section 140m. 【0157】 The display element 130m is positioned to project image light towards the windshield 2. The reflector 140m is a mirror formed in the area of ​​the windshield 2 where the image light is projected. The reflector 140m reflects the image light emitted from the display element 130m towards the driver. In other words, the image light reflected by the reflector 140m is directed towards the driver's eyes (eyebox I) in the driver's seat, becoming the first display virtual image 101m. In this way, since the reflector 140m is provided on the windshield 2, the space consumed by the reflector 140m can be reduced, and the overall system can be made smaller. 【0158】 [Example 12] Modification 12 will now be described. Figure 20 is a schematic diagram showing a display system 10n according to Modification 12 of Embodiment 1. As shown in Figure 20, the display system 10n is equipped with a camera 400n that photographs the user's head. The camera 400n is positioned near the top of the windshield 2. The camera 400n is positioned so that its field of view is directed towards the rear of the vehicle interior. The camera 400n is responsively connected to the control unit 500 and outputs the captured video to the control unit 500. The control unit 500 extracts a viewpoint from multiple feature points included in the user's head by applying well-known image processing to the video acquired from the camera 400n. Furthermore, the control unit 500 detects the position of the viewpoint by comparing each feature point of the vehicle interior shown in the video with the viewpoint. In other words, the camera 400n and the control unit 500 are an example of a viewpoint detection unit according to this disclosure. 【0159】 The control unit 500 determines whether the detected viewpoint position falls within a predetermined range Is (see Figure 23, etc.). Here, the predetermined range Is is a range smaller than the eye box I. For example, if the horizontal length of the eye box I is 130 mm and the vertical length is 40 mm, then the horizontal length of the predetermined range Is is 100 mm and the vertical length is 20 mm. If the control unit 500 determines that the detected viewpoint position falls within the predetermined range Is, it displays the first virtual image 101 in the second state on the first display device 100. On the other hand, if the control unit 500 determines that the detected viewpoint position does not fall within the predetermined range Is, it displays the first virtual image 101 in the first state on the first display device 100. 【0160】 Figure 21 is an explanatory diagram showing an example of display according to modification 12. In Figure 21, the size of the second region R2n is larger than that of the first region R1n in the vertical and horizontal directions. Figure 21(a) shows an example of display when the viewpoint position is within a predetermined range Is. Therefore, the control unit 500 determines that the detected viewpoint position is within the predetermined range Is, and the first display device 100 displays the first display virtual image 101 in the second state. In other words, the first display virtual image 101 is displayed across the entirety of the second region R2n. 【0161】 Figure 21(b) shows an example of the display just before the viewpoint moves to the left and extends beyond the predetermined range Is. At this time, the second region R2n appears to be shifted to the left of the display region 141 as the viewpoint moves, but since it is still within the display region 141, the first display virtual image 101 within the second region R2n is visible to the user. In other words, the first display virtual image 101 is displayed in the second state. 【0162】 Figure 21(c) shows an example of a display where the viewpoint has moved further to the left and extends beyond the predetermined range Is. In this case, the second region R2n also extends outside the display region 141, so if the second state is maintained, the left edge of the first display virtual image 101 will appear to be missing to the user. For this reason, if the control unit 500 determines that the detected viewpoint position is not within the predetermined range Is, it displays the first display virtual image 101 in the first state by reducing the display image of the first display device 100. In other words, the first display virtual image 101 is displayed in its entirety within the first region R1n, making it smaller than in the second state. The switch from the second state to the first state may be instantaneous or gradual. 【0163】 Here, the transition from the second state to the first state includes both the first and second switching modes. The first and second switching modes will be explained using the example of the user's viewpoint moving to the left, but the process is basically the same for other directions (right, up, down). 【0164】 First, the first switching mode will be explained. In the first switching mode, as the viewpoint e moves, the left-right center of the first display virtual image 101 appears to shift from the left-right center of the display area 141. Figure 22 is an explanatory diagram showing the appearance of the first display virtual image 101 and the change in the display range on the display element 130 in the first switching mode according to Embodiment 1. Figure 23 is an explanatory diagram showing the first switching mode according to Embodiment 1, including the change in the user's viewpoint e. In Figure 23, the viewpoint e is illustrated using the user's left eye as an example, and the display area 141 corresponding to the field of view of the reflector 140 is located behind it (above the viewpoint e in Figure 23), and the first display virtual image 101 is located behind that. Note that the display element 130 is not shown in Figure 23. 【0165】 Figures 22(a) and 23(a) show the case where the viewpoint e is positioned at the center Isc in the left-right direction of a predetermined range Is. In this case, the entire display area 131 of the display element 130 becomes the displayable range (hatched area in Figure 22(a)). At this time, the left-right centers of the first region R1n and the second region R2n roughly coincide with the center Isc. The first display virtual image 101 is displayed in the second region R2n. 【0166】 Figures 22(b) and 23(b) show the state just before the viewpoint e moves to the left and exceeds the predetermined range Is. Even in this case, the entire display area 131 of the display element 130 becomes the displayable range (hatched area in Figure 22(b)). At this time, the left-right centers of the first region R1n and the second region R2n are shifted to the left with respect to the center Is as the viewpoint e moves. The first display virtual image 101 is displayed in this shifted second region R2n. 【0167】 Figures 22(c) and 23(c) show that the viewpoint e has moved further to the left, exceeding the predetermined range Is. At this point, the system switches to the first state. In the first state, the control unit 500 displays the first virtual image 101 only in the first region R1n, so a portion of the entire display area 131 of the display element 130 becomes the displayable range (hatched area in Figure 22(c)). At this time, the left-right center of the first region R1n is shifted further to the left relative to the center Isc as the viewpoint e moves. Since the first virtual image 101 is displayed in this shifted first region R1n, the size of the first virtual image 101 appears smaller to the user. 【0168】 Next, the second switching mode will be described. In the second switching mode, even if the viewpoint e moves, the left-right center of the first display virtual image 101 remains constant. Figure 24 is an explanatory diagram showing the appearance of the first display virtual image 101 and the change in the display range on the display element 130 in the second switching mode according to Embodiment 1. Figure 25 is an explanatory diagram showing the change in the user's viewpoint e in the second switching mode according to Embodiment 1. Figure 24 corresponds to Figure 22, and Figure 25 corresponds to Figure 23. 【0169】 Figures 24(a) and 25(a) show the case where the viewpoint e is positioned at the center Isc in the left-right direction of a predetermined range Is. In this case, the displayable range (hatched area in Figure 24(a)) is smaller in the left-right and up-down directions than the entire display area 131 of the display element 130. At this time, the left-right centers of the first region R1n and the second region R2n roughly coincide with the center Isc. The first display virtual image 101 is displayed in the second region R2n. 【0170】 Figures 24(b) and 25(b) show the position of viewpoint e moving to the left, just before it extends beyond the predetermined range Is. At this time, the displayable range of the display element 130 (hatched area in Figure 24(b)) also moves in the opposite direction, i.e., to the right, in conjunction with the movement of viewpoint e. This maintains that the left-right centers of the first region R1n and the second region R2n roughly coincide with the center Isc. The first display virtual image 101 is displayed in the second region R2n. 【0171】 Figures 24(c) and 25(c) show that the viewpoint e has moved further to the left, exceeding the predetermined range Is. At this point, the system switches to the first state. In the first state, the first display virtual image 101 is displayed only in the first region R1n, which is smaller than the second region R2n, so the displayable range of the display element 130 (hatched area in Figure 24(c)) also becomes smaller. 【0172】 As described above, the second state is achieved when the position of viewpoint e falls within the predetermined range Is, and the first state is achieved when the position of viewpoint e does not fall within the predetermined range Is. Therefore, the first and second states can be switched depending on the position of viewpoint e. 【0173】 [Modified example 13] Modification 13 will now be described. Modification 13 describes a case in which a guidance mark M1 is displayed in the second region R2m to guide the user's gaze toward a warning target included in the rear image G16. This display is performed by the control unit 500 controlling the first display device 100. 【0174】 Figure 26 is an explanatory diagram showing an example of a modified example 13 according to Embodiment 1. In Figure 26, the size of the second region R2m is larger than that of the first region R1m in both the vertical and horizontal directions. The speedometer G11 is displayed in the first region R1m, and the frame image G15 is displayed in the second region R2m. 【0175】 In the rear view image G16 within the frame image G15, a motorcycle is displayed as the warning target Mm. The control unit 500 controls the first display device 100 to display a guidance mark M in the second region R2m to guide the user's gaze toward the warning target Mm in the frame image G15. Here, an example is shown where guidance marks M are provided both above and below, but guidance marks M may be provided only on one of the top or bottom. However, depending on the user's sitting height, one of the guidance marks M may be difficult to see, so it is preferable to provide guidance marks M on both the top and bottom. 【0176】 As shown in Figure 26(a), the guidance mark M is displayed in its initial position, and then gradually moves closer to the warning target Mm in the order of (b), (c), (d), (e), and (f). This display may be repeated. In other words, once the guidance mark M approaches the warning target Mm, it returns to its initial position and is then displayed again to approach the warning target Mm. 【0177】 Furthermore, the control unit 500 may emphasize the guidance mark M as the distance between the vehicle 1 and the actual warning target decreases. This emphasis may include increasing the speed at which the guidance mark M moves, increasing its size, or changing the color of the guidance mark M. 【0178】 As described above, the guidance mark M is displayed in the second region R2m towards the warning target Mm included in the rear image G16. Therefore, the user can shift their gaze to the warning target Mm by seeing the guidance mark M. This allows the user to notice the warning target Mm early. 【0179】 Furthermore, since the guidance mark M is displayed as the vehicle gradually approaches the warning target Mm, the guidance mark M can be represented in an animated manner, making it easier for the user to notice it. In addition, the guidance mark M is emphasized as the distance between vehicle 1 and the actual warning target decreases, so the user can also be notified that the vehicle is getting closer to the actual warning target. 【0180】 Furthermore, when the guidance marker M approaches the warning target Mm, it returns to its initial position and is displayed again to guide the user towards the warning target Mm. This means that the guidance marker M repeatedly moves towards the warning target Mm. Therefore, it is easier for the user to notice the guidance marker M. 【0181】 <Embodiment 2> Figure 27 is a schematic diagram showing the display system B10 according to Embodiment 2 installed in vehicle B1. In Figure 27, vehicle B1 is shown in cross-section. Here, the user of the display system B10 is the driver riding in vehicle B1. 【0182】 As shown in Figure 27, the display system B10 comprises a first display device B100, a second display device B200, an imaging unit B400, and a control unit B500. The first display device B100 and the second display device B200 are located, for example, in the dashboard B4 of vehicle B1 (see Figure 28). The first display device B100 and the second display device B200 display vehicle information relating to vehicle B1 as the first virtual image B101 and the second virtual image B201, respectively. Examples of vehicle information include the vehicle speed of vehicle B1, engine speed, detection results of objects approaching vehicle B1, navigation information from the current location of vehicle B1 to the destination, image information captured by a camera capturing the rear of vehicle B1, and notification information for the driver. The notification information is information indicating the presence of an object BP (see Figure 28) in the image captured by the imaging unit B400, and is an example of a warning target that warns the driver of its presence. For example, object BP could be a moving object (pedestrian, animal, or other vehicle besides vehicle B1, such as a car, motorcycle, or scooter) surrounding vehicle B1. In other words, the notification information is intended to inform the driver of vehicle B1 that a moving object is approaching vehicle B1. 【0183】 In Figure 27, an example is shown where the first display device B100 and the second display device B200 are located within the dashboard B4. However, the installation locations of the first display device B100 and the second display device B200 are not limited to this. For example, the first display device B100 may be located on the center console, or the second display device B200 may be located near the upper edge of the windshield B2. 【0184】 The first display device B100 is an opaque display. The first display device B100 projects image light toward the driver. The driver perceives the image light that enters their eyes as the first virtual image B101 projected far away from the first display device B100. In other words, the image light emitted from the first display device B100 is directed toward the eyes of the driver sitting in the driver's seat and becomes the first virtual image B101. The first virtual image B101 is an example of the first displayed virtual image. Figure 27 illustrates an example of the position of the first virtual image B101 as seen from the driver's viewpoint. Note that the first display device B100 may be a transparent display such as a HUD (Head-up Display). Figure 27 illustrates an example of the position of the first virtual image B101 as seen from the driver's viewpoint. This position can be set by adjusting the viewing distance of the image light emitted from the first display device B100. The driver's viewpoint is, for example, the reference eye point. The reference eye point is "a point that represents the position of the driver's eyes in a normal driving state." 【0185】 The second display device B200 is a transparent display such as an AR-HUD (Augmented Reality Head-up Display). The second display device B200 projects light onto the display medium, the windshield B2. The projected light is reflected by the windshield B2. This reflected light is directed towards the driver's eyes, who are seated in the driver's seat. The driver perceives this reflected light as a second virtual image B201, which appears on the opposite side of the windshield B2 (outside the vehicle), with the actual objects visible through the windshield B2 as the background. The second virtual image B201 is an example of a second display virtual image. 【0186】 The imaging unit B400 is a camera that images the area around vehicle B1. Specifically, the imaging unit B400 images the area in front of vehicle B1. The imaging unit B400 is positioned in front of the driver sitting in the driver's seat. Specifically, the imaging unit B400 is positioned at the front of vehicle B1. Therefore, it is possible for the imaging unit B400 to image objects BP that are in the driver's blind spot. 【0187】 The control unit B500 is located within the dashboard B4 and controls the first display device B100, the second display device B200, and the imaging unit B400. Specifically, the control unit B500 is equipped with a CPU, RAM, ROM, etc., and the CPU executes each process by loading the program in ROM into RAM and executing it. For example, the control unit B500 performs image processing on the image data captured by the imaging unit B400 to recognize at least one object BP in the image data and detects its position coordinates, size, etc. Furthermore, the control unit B500 performs image processing on the image data to recognize structures (buildings, walls, etc.) included in the image data and detects their position coordinates, size, etc. The control unit B500 extracts object BPs that are in a blind spot due to structures when viewed from the driver's viewpoint (reference eye point), creates first guidance information BY210 (see Figure 28) based on the position coordinates and size of the extracted object BPs, etc., and displays it on the second display device B200. 【0188】 [Guidance method] The following describes the eye-tracking guidance provided to the driver by the first virtual image B101 and the second virtual image B201. During eye-tracking guidance, the display switches from the first eye-tracking guidance display to the second eye-tracking guidance display. 【0189】 First, the first eye-tracking guidance display will be explained. Figure 28 is an explanatory diagram showing an example of the first eye-tracking guidance display according to Embodiment 2. In Figure 28, the second display area B202 of the second virtual image B201 from the second display device B200 overlaps the windshield B2 as a whole, with roughly the lower half overlapping the hood B3 of the vehicle B1. The first display area B102 of the first virtual image B101 from the first display device B100 overlaps the dashboard B4. 【0190】 In the first eye-tracking guidance display, the control unit B500 controls the second display device B200 to display the first guidance information BY210 as an arrow in the second display area B202 of the second virtual image B201. Meanwhile, the control unit B500 controls the first display device B100 to display the image captured by the imaging unit B400 across the entire first display area B102 of the first virtual image B101. Here, the image captured by the imaging unit B400 is an example of vehicle surrounding information. Vehicle surrounding information is information that shows the situation around vehicle B1, and in this embodiment, it is the image of the area in front of vehicle B1 captured by the imaging unit B400. Note that the vehicle surrounding information may be a navigation image linked to the image captured by the imaging unit B400, or it may be a combination of the image and a navigation image. 【0191】 The first guidance information BY210 is an arrow that guides the driver's gaze to the first display area B102 of the first virtual image B101. In this embodiment, the case where the first guidance information BY210 is an arrow is illustrated, but other shapes may be used as long as they can guide the driver's gaze to the first display area B102. 【0192】 Object BP is in a blind spot of wall BW from the driver's viewpoint and cannot be seen, but it is captured by imaging unit B400 and therefore appears in the image from imaging unit B400. The control unit B500 extracts this blind spot object BP and places the first guidance information BY210 on the straight line BL connecting its coordinate position and the display reference point BPS. The straight line BL is a virtual straight line set to span the first display area B102 and the second display area B202, and is not displayed in the first display area B102 and the second display area B202 in Figure 28, but may be displayed. 【0193】 In this embodiment, since the object BP is located outside the second display area B202, the display reference point BPS is set on the center line BLc in the width direction (vehicle width direction) of the second display area B202. The display reference point BPS may be located inside or outside the second display area B202. Furthermore, the display reference point BPS may be located at the vanishing point as seen from the driver. In this case, the driver is more likely to notice the first guidance information BY210 when looking ahead. 【0194】 Subsequently, if, from the driver's perspective, the object BP appears from behind a structure and is not in a blind spot, the control unit B500 controls the first display device B100 and the second display device B200 to switch the display content of the first virtual image B101 and the second virtual image B201 from the first line of sight guidance display to the second line of sight guidance display. 【0195】 Figure 29 is an explanatory diagram showing an example of a second eye-tracking guidance display according to Embodiment 2. Specifically, as shown in Figure 29, the control unit B500 controls the second display device B200 to stop the display of the second virtual image B201. At the same time, the control unit B500 controls the first display device B100 to prevent the vehicle surrounding information (image captured by the imaging unit B400) from being displayed in the first display area B102 of the first virtual image B101, and instead displays the second guidance information BY220 in the first display area B102. The second guidance information BY220 is information to encourage the driver to direct their gaze forward of the vehicle B1. The second guidance information BY220 shown in Figure 29 includes icon information BY221 and text information BY222 to encourage directing the gaze forward to the right of the vehicle B1. The icon information BY221 includes a vehicle figure representing the vehicle B1 and a picture indicating the direction in which to direct the gaze toward that vehicle figure. Text information BY222 contains character information that indicates the direction in which to guide the driver's gaze and the motivation for doing so. In this embodiment, since another vehicle B9, which is the target of the warning, is located to the right front of vehicle B1, the control unit B500 extracts the other vehicle B9 based on the vehicle surrounding information obtained by the imaging unit B400 and recognizes the direction of the other vehicle B9 relative to vehicle B1 from its coordinate position. Based on this recognized direction, the control unit B500 determines the direction in which to guide the driver's gaze and creates second guidance information BY220 based on that direction. Subsequently, the control unit B500 controls the first display device B100 to display the second guidance information BY220 in the first display area B102 of the first virtual image B101. 【0196】 In Figure 29, another vehicle B9, which is the target of the warning, is located to the right and in front of vehicle B1. However, if other vehicle B9 is not present, the control unit B500 may, once the target object BP emerges from behind a structure and is no longer in the blind spot, create second guidance information based on the direction of the target object BP (for example, "Pay attention to the left front") to guide the driver's gaze toward the target object BP, and display this information in the first display area B102 of the first virtual image B101. This reduces the possibility that a driver who has seen the target object BP in the first display area B102 of Figure 28 may become confused about where to look next. 【0197】 [Effects, etc.] As described above, according to this embodiment, in the first eye-tracking display, vehicle surrounding information is displayed in the first display area B102 of the first virtual image B101, and first guidance information BY210, which encourages eye-tracking to the first virtual image B101, is displayed in the second display area B202 of the second virtual image B201. Subsequently, in the second eye-tracking display, second guidance information BY220, which encourages eye-tracking to the front of the vehicle B1, is displayed in the first display area B102. Thus, in the second eye-tracking display, the second guidance information BY220 is displayed in the first virtual image B101, so the driver shifts their gaze to the front of the vehicle upon seeing the second guidance information BY220. Therefore, prolonged viewing of the first virtual image B101 is suppressed, and the stability of safety confirmation actions can be improved. 【0198】 Furthermore, when the second guidance information BY220 is displayed in the first display area B102, vehicle surrounding information is not displayed in the first display area B102, making it easier for the driver to concentrate on the second guidance information BY220. 【0199】 Furthermore, if it is determined that the object BP located in front of vehicle B1 is not in the driver's blind spot, the vehicle surrounding information will not be displayed in the first display area B102, thus preventing the unintentional display of vehicle surrounding information in the first display area B102. This allows the driver to concentrate on visualizing the area in front of the vehicle. 【0200】 [Example 1] Modification 1 of Embodiment 2 will now be described. In the following description, parts identical to those in Embodiment 2 may be denoted by the same reference numerals and their descriptions may be omitted. 【0201】 Figure 30 is an explanatory diagram showing an example of a second eye-tracking guidance display according to Modification 1 of Embodiment 2. In Modification 1, the second guidance information BY220a is displayed in the first display area B102 of the first virtual image B101, and the third guidance information BY230a is displayed in the second display area B202 of the second virtual image B201. Specifically, the control unit B500 controls the first display device B100 to prevent the vehicle surrounding information (image captured by the imaging unit B400) from being displayed in the first virtual image B101, and instead displays the second guidance information BY220a in the first display area B102. The second guidance information BY220a exemplified in Modification 1 is a figure consisting of multiple arrows. On the other hand, the control unit B500 controls the second display device B200 to display the third guidance information BY230a in the second display area B202 of the second virtual image B201. The third guidance information BY230a is information that encourages eye-tracking guidance towards the front of the vehicle B1. In this modified example, the third guidance information BY230a is a figure consisting of multiple arrows, oriented in a direction that guides the gaze (towards other vehicle B9). 【0202】 In the first modified example, since another vehicle B9, which is the target of the warning, is located to the right and in front of vehicle B1, the control unit B500 extracts the other vehicle B9 based on the vehicle surrounding information obtained by the imaging unit B400 and recognizes the direction of the other vehicle B9 relative to vehicle B1 from its coordinate position. Based on this recognized direction, the control unit B500 determines the direction to guide the driver's gaze and creates third guidance information BY230a based on that direction. The control unit B500 controls the second display device B200 to display the third guidance information BY230a in the second display area B202 of the second virtual image B201, thereby guiding the driver's gaze to the other vehicle B9 located in front of vehicle B1. 【0203】 Thus, when the second guidance information BY220a is displayed in the first display area B102, the third guidance information BY230a, which encourages the driver's gaze to move forward in front of the vehicle B1, is also displayed in the second display area B202. Therefore, the second guidance information BY220a and the third guidance information BY230a work together to further guide the driver's gaze forward in front of the vehicle B1. This makes it possible to further improve the stability of safety confirmation actions. 【0204】 Furthermore, since the third guidance information BY230a is displayed in the second display area B202 so that the driver's gaze is guided to the other vehicle B9 (the vehicle to be warned about) located in front of vehicle B1, the third guidance information BY230a can guide the driver's gaze to the other vehicle B9. This makes it possible to further improve the stability of safety confirmation actions. 【0205】 If no other vehicle B9 is present, the control unit B500 may display the second guidance information for the target object BP in the first display area B102, and the third guidance information in the second display area B202. 【0206】 [Differentiation 2] Modification 2 will now be described. Modification 2 describes a case in which a new third line of sight guidance is provided after the second line of sight guidance according to Embodiment 2. Figure 31 is an explanatory diagram showing an example of the third line of sight guidance according to Modification 2. 【0207】 After a certain period of time has elapsed since the second eye-tracking guidance display was activated, the control unit B500 controls the first display device B100 to hide the first display area B102 of the first virtual image B101, and controls the second display device B200 to display the third guidance information BY230b and text information BY232b in the second display area B202 of the second virtual image B201. In this modified example, the third guidance information BY230b is a figure consisting of multiple arrows pointing in the direction of travel of the other vehicle B9. The text information BY232b contains textual information that indicates the direction in which to guide the driver's gaze and the motivation for doing so. 【0208】 Thus, since the third guidance information BY230b and the text information BY232b that assists in eye-tracking are displayed in the second display area B202 of the second virtual image B201, the driver can more easily shift their gaze to the other vehicle B9 by visually confirming the third guidance information BY230b and the text information BY232b. 【0209】 Furthermore, if the display time of the vehicle surrounding information exceeds a certain period of time, the vehicle surrounding information will no longer be displayed in the first display area B102 of the first virtual image B101. This suppresses the display of vehicle surrounding information in the first display area B102 for extended periods. As a result, the driver can concentrate on visualizing the area in front of the vehicle. 【0210】 Figure 32 is an explanatory diagram showing another example of a third line of sight guidance display according to a modified example 2 of Embodiment 2. As shown in Figure 32, the third guidance information BY230c may be oriented in the direction that guides the gaze (towards other vehicle B9). 【0211】 Figure 33 is an explanatory diagram showing another example of a third eye-tracking guidance display according to a modification 2 of Embodiment 2. As shown in Figure 33, the third guidance information BY230d may be displayed with the edge of the direction in which the eye should be guided highlighted in the second display area B202 of the second virtual image B201. Highlighting is a visually conspicuous display, emphasized by lighting, flashing, coloring, etc., so that the driver notices the direction. In this way, as the third guidance information BY230d, the edge of the second display area B202 is highlighted, so the driver can shift their gaze to the other vehicle B9 by visually noticing the highlighting. 【0212】 In addition, in Modification 2, as in Modification 1, if no other vehicle B9 is present, the control unit B500 may display third guidance information and text information (for example, "Caution: Left Front") directed towards the target object BP in the second display area B202, or it may highlight the edge of the target object BP in the second display area B202 (leftward in Figure 33). 【0213】 [Difference 3] Modification 3 will now be described. Modification 3 describes another example of the second eye-tracking guidance display. Figure 34 is an explanatory diagram showing an example of the second eye-tracking guidance display according to Modification 3 of Embodiment 2. As shown in Figure 34, in Modification 3, the second guidance information BY220e is displayed in the first display area B102 of the first virtual image B101, and the third guidance information BY230e is displayed in the second display area B202 of the second virtual image B201. Specifically, the control unit B500 controls the first display device B100 to display vehicle surrounding information (image captured by the imaging unit B400) in the first display area B102 of the first virtual image B101, and to display the second guidance information BY220e superimposed on the vehicle surrounding information in the first display area B102. The second guidance information BY220e is text information including character information that means the direction and motivation for guiding the driver's gaze. 【0214】 Furthermore, the control unit B500 controls the second display device B200 to display the third guidance information BY230e in the second display area B202 of the second virtual image B201. The third guidance information BY230e is text information that includes character information indicating the direction in which to guide the driver's gaze and the motivation for doing so. 【0215】 Thus, when at least one of the second guidance information BY220e and the third guidance information BY230e is displayed, the vehicle surrounding information is also displayed in the first display area B102. Therefore, the driver can check the vehicle surrounding information while shifting their gaze based on at least one of the second guidance information BY220e and the third guidance information BY230e. 【0216】 In addition, in Modification 3, as in Modification 2, if no other vehicle B9 is present, the control unit B500 may display text information (for example, "Caution: Left Front") directed towards the target object BP in at least one of the first display area B102 and the second display area B202. 【0217】 Furthermore, when the vehicle B1's speed exceeds a certain speed, the control unit B500 controls the first display device B100 so that the vehicle surrounding information does not need to be displayed in the first display area B102. In this case, when the vehicle B1's speed exceeds a certain speed, the vehicle surrounding information is not displayed in the first display area B102, so the vehicle surrounding information is not displayed in the first display area B102 in situations where the driver must concentrate on driving (such as during high-speed driving). In other words, the driver can concentrate on visually inspecting the area in front of the vehicle. 【0218】 The above embodiment 2 illustrates a case where visual gaze guidance is performed. However, gaze guidance using sound, vibration, etc., may also be added. 【0219】 In the above embodiment 2, a first display device B100 and a second display device B200 that display virtual images were exemplified. However, at least one of the first display device and the second display device may be a display device that displays an image that is not a virtual image. 【0220】 <Embodiment 3> Figure 35 is a schematic diagram showing the display system C10 according to Embodiment 3 installed on vehicle C1. In Figure 35, vehicle C1 is shown in cross-section. 【0221】 As shown in Figure 35, the display system C10 comprises a display device C100 and a control unit C500. The display device C100 is located, for example, on the dashboard of vehicle C1. The display device C100 displays vehicle information related to vehicle C1 as a virtual image C101. In other words, the display device C100 is an example of a first display device, and the virtual image C101 is an example of a first virtual image. Examples of vehicle information include the vehicle speed of vehicle C1, engine speed, detection results of objects approaching vehicle C1, navigation information from the current location of vehicle C1 to the destination, and image information captured by the imaging unit C3 that images the area around vehicle C1. Although Figure 35 illustrates the case where the display device C100 is located on the dashboard, the installation location of the display device C100 is not limited to this, and it may be located, for example, on the center console. 【0222】 [Display device] As shown in Figure 35, the display device C100 projects image light toward the driver, who is the user of the display system C10. The driver perceives the image light that enters their eyes as a virtual display image C101 projected in the distance on the windshield CD1. 【0223】 Figure 36 is a schematic cross-sectional view showing a display device C100 according to Embodiment 3. As shown in Figure 36, the display device C100 comprises a housing C120, a display element C130, and a concave mirror C140. 【0224】 The housing C120 is a box-shaped body made of light-shielding resin or metal. An opening C121 is formed at the upper end of the housing C120. From the opening C121, image light, which becomes the display virtual image C101, is projected upward. The display element C130 is housed in the internal space of the housing C120. 【0225】 The display element C130 is, for example, a liquid crystal panel, and when light from a light source (not shown) is shone upon it, it shines image light, which becomes the virtual image C101, onto the aperture C121. The display element C130 may also be an organic EL panel. The display element C130 is positioned with its display surface facing upwards. 【0226】 The concave mirror C140 is positioned above the housing C120 and is an example of an optical system that reflects the image light emitted from the display element C130 through the aperture C121 to form a virtual image C101. Therefore, the final reflective surface of the optical system is the concave mirror C140. In this embodiment, the case in which only the concave mirror C140 constitutes the optical system is illustrated, but the optical system may be composed of multiple optical elements. Even in the case of an optical system consisting of multiple optical elements, the final reflective surface may be the concave mirror. The concave mirror C140 may also be provided on the windshield CD1 of the vehicle C1. In this case, the concave mirror C140 may be attached to the windshield CD1, or the windshield CD1 itself may be the concave mirror C140. 【0227】 The concave mirror C140 is positioned to reflect the image light emitted from the display element C130 toward the driver. In other words, the image light reflected by the concave mirror C140 is directed toward the driver's eyes in the driver's seat, becoming the virtual image C101. Figure 35 illustrates the position of the virtual image C101 as seen from the driver's viewpoint. This position can be set by adjusting the viewing distance of the image light emitted from the display element C130 of the display device C100. The driver's viewpoint is, for example, the reference eye point. The reference eye point is "a point that represents the position of the driver's eyes in a normal driving state." 【0228】 [Control Unit] As shown in Figure 35, the control unit C500 is electrically connected to the display device C100 and controls the display content of the display element C130. Specifically, the control unit C500 includes a CPU, RAM, ROM, etc., and the CPU executes each process by loading the program in ROM into RAM and executing it. 【0229】 The control unit C500 is connected to an imaging unit C3, which is installed in the vehicle C1 and captures images of the area around the vehicle C1, via wired or wireless communication. The imaging unit C3 may also be installed in the display system C10. 【0230】 The imaging unit C3 includes a front camera that photographs the front of vehicle C1, a rear camera that photographs the rear of vehicle C1, a right-side camera that photographs the right side of vehicle C1, and a left-side camera that photographs the left side of vehicle C1. Here, the right side includes the front right and rear right of vehicle C1, and the left side includes the front left and rear left of vehicle C1. The right-side image taken by the right-side camera and the left-side image taken by the left-side camera are examples of side images showing the side of vehicle C1. 【0231】 The control unit C500 controls the display device C100 to display a portion of the image obtained by the imaging unit C3 as the surrounding image, thereby displaying it within the virtual image C101. 【0232】 [Displayed virtual image] Next, the display virtual image C101 will be described. Figure 37 is a plan view showing the display virtual image C101 according to Embodiment 3. Figure 37 shows the display virtual image C101 as seen from the driver's perspective. The center of the display virtual image C101 in the vehicle width direction roughly coincides with the center of the driver in the vehicle width direction (center of the steering wheel) when seated in vehicle C1. As shown in Figure 37, the display virtual image C101 has a central region C102 in the vehicle width direction of vehicle C1, and one end region C103 and the other end region C104 in the vehicle width direction, which are continuous. The central region C102, the one end region C103, and the other end region C104 are each formed in a rectangular shape. The one end region C103 and the other end region C104 are the same size, but the central region C102 is a different size. The lower end of the central region C102 and the lower ends of the one end region C103 and the other end region C104 are aligned in a straight line. Therefore, one end region C103 and the other end region C104 overlap with the horizontal line CL that passes through the height center of the central region C102. 【0233】 Furthermore, the first height CH1 in the central region C102 is different from the second height CH2 in the one-end region C103 and the other-end region C104. Specifically, the second height CH2 is greater than the first height CH1. The second length CW2 in the vehicle width direction in the one-end region C103 and the other-end region C104 is greater than the first length CW1 in the vehicle width direction in the central region C102. 【0234】 Here, Figure 37 shows the virtual display image C101 during normal driving. As shown in Figure 37, the control unit C500 controls the display device C100 to display content for normal driving on the virtual display image C101 during normal driving. Specifically, the control unit C500 displays, for example, an analog speedometer CG13 in one end area C103, a digital speedometer CG12 in the central area C102, and an analog tachometer CG14 in the other end area C104. In this way, during normal driving, instrument images such as the speedometer CG13 and tachometer CG14 are displayed in the one end area C103 and the other end area C104. 【0235】 Figure 38 is a plan view showing an example of display when notification information is generated in the display virtual image C101 according to Embodiment 3. As shown in Figure 38, the control unit C500 controls the display device C100 to display the display content for notification information generation on the display virtual image C101 when notification information is generated. Notification information generation occurs, for example, when a warning target (another vehicle, person, obstacle, etc.) approaches the vehicle C1, or when the driver performs an operation to switch the display content. Specifically, the control unit C500 displays the left-side image CG23 captured by the left-side camera in one end area C103, displays the digital vehicle speed meter CG12 in the central area C102, and displays the right-side image CG24 captured by the right-side camera in the other end area C104. 【0236】 At this time, the control unit C500 may control the display device so that the lateral image, as viewed from the positions of one end region C103 and the other end region C104 of the displayed virtual image C101, is displayed in the one end region and the other end region. Here, we will explain using the one end region C103 and the left lateral image CG23 as an example. The control unit C500 recognizes in advance the coordinate position on which the one end region C103 is projected. Based on that coordinate position, the coordinate position on which the left lateral camera is installed, and the coordinate position of the reference eye point, the control unit C500 performs image processing on the left lateral image CG23 to create a virtual left lateral image as seen by the driver from the position of the one end region C103. The control unit C500 displays the virtual left lateral image in the one end region C103. This makes it possible to display a left lateral image that is less unnatural to the driver. 【0237】 [Method for forming the outline of a virtual image] Next, a method for forming the outline of the virtual image C101 will be described. To form the outline of the virtual image C101 described above, there are two methods: one using a concave mirror C140 and another using a display element C130. 【0238】 First, the method implemented by the concave mirror C140 will be explained. Figure 39 is a plan view showing the concave mirror C140 according to Embodiment 3. As shown in Figure 39, the external shape of the concave mirror C140 corresponds to the external shape of the displayed virtual image C101. Specifically, the concave mirror C140 integrally comprises a central mirror region C142, one-end mirror region C143, and the other-end mirror region C144. The central mirror region C142 corresponds to the central region C102 of the displayed virtual image C101, the one-end mirror region C143 corresponds to the one-end region C103 of the displayed virtual image C101, and the other-end mirror region C144 corresponds to the other-end region C104 of the displayed virtual image C101. 【0239】 The central mirror region C142, the one-end mirror region C143, and the other-end mirror region C144 are each formed in a rectangular shape. The one-end mirror region C143 and the other-end mirror region C144 are the same size, but the central mirror region C142 is a different size. The lower end of the central mirror region C142 lies on a straight line with the lower ends of the one-end mirror region C143 and the other-end mirror region C144. 【0240】 Furthermore, the height CHm1 of the first mirror in the central mirror region C142 is different from the height CHm2 of the second mirror in the one-end mirror region C143 and the other-end mirror region C144. Specifically, the height CHm2 of the second mirror is greater than the height CHm1 of the first mirror. The length CWm1 of the first mirror in the vehicle width direction in the central mirror region C142 is greater than the length CWm2 of the second mirror in the vehicle width direction in the one-end mirror region C143 and the other-end mirror region C144. By reflecting the image light off such a concave mirror C140, a virtual image C101 of the above shape can be formed regardless of the shape of the display element C130. 【0241】 Figure 40 is a plan view showing a modified example of the concave mirror C140 according to Embodiment 3. As shown in Figure 40, the concave mirror C140 may be divided into a central mirror region C142, a one-end mirror region C143, and a other-end mirror region C144. In this case, the central mirror region C142, the one-end mirror region C143, and the other-end mirror region C144 are held by a single retaining member C149. 【0242】 Next, the method realized by the display element C130 will be explained. Figure 41A is a plan view showing the display element C130 according to Embodiment 3. As shown in Figure 41A, the external shape of the display element C130 corresponds to the external shape of the virtual display image C101. Specifically, the display element C130 is divided into a central element C132 and a pair of end elements C133 and C134. The central element C132 is a display element (liquid crystal element) corresponding to the central region C102 in the virtual display image C101, one end element C133 is a display element (liquid crystal element) corresponding to one end region C103 in the virtual display image C101, and the other end element C134 is a display element (liquid crystal element) corresponding to the other end region C104 in the virtual display image C101. The central element C132 and the end elements C133 and C134 are each formed in a rectangular shape. The end elements C133 and C134 are the same size, but the central element C132 is a different size. The lower end of the central element C132 lies in a straight line with the lower ends of the end elements C133 and C134. 【0243】 Furthermore, the first element height CHe1 in the central element C132 is different from the second element height CHe2 in the end elements C133 and C134. Specifically, the second element height CHe2 is greater than the first element height CHe1. The second element length CWe2 in the vehicle width direction of the end elements C133 and C134 is greater than the first element length CWe1 in the vehicle width direction of the central element C132. By emitting image light from such display elements C130, a virtual image C101 of the above shape can be formed regardless of the shape of the concave mirror C140. 【0244】 FIG. 41B is a plan view showing a modified example of the display element C130 according to Embodiment 3. As shown in FIG. 41B, the display element C130 is generally rectangular, but the upper part (the dotted hatching part) at the center in the vehicle width direction is a non-display area C135 and is controlled by the control unit C500. That is, the central element C132 and the pair of end elements C133 and C134 are integrally formed, and due to the presence of the non-display area C135, the first element height CHe1 of the central element C132 and the second element height CHe2 of the end elements C133 and C134 are different. 【0245】 [Effects, etc.] As described above, according to the above embodiment, since the first height CH1 of the central region C102 in the display virtual image C101 is different from the second height CH2 of the one end region C103 and the other end region C104, the virtual image (speedometer CG12) displayed in the central region C102 and the virtual images (speedometer CG13, tachometer CG14, left side image CG23, and right side image CG24) displayed in the one end region C103 and the other end region C104 can be recognized by the driver as separate virtual images. That is, the display virtual image C101 projected by one display device C100 can be recognized by the driver as a plurality of virtual images, and an increase in the size of the entire system can be suppressed. Also, since the virtual image displayed in the central region C102 and the virtual images displayed in the one end region C103 and the other end region C104 are within the display virtual image C101, the movement of the driver's line of sight and the adjustment of focus are also reduced. Furthermore, since the first height CH1 of the central region C102 in the display virtual image C101 is different from the second height CH2 of the one end region C103 and the other end region C104, even when compared with the case where the entire display area is rectangular, it becomes easier for the driver to distinguish and grasp the display virtual image C101 displayed in the one end region C103 and the other end region C104 from the central region C102, and the driver's field of view is less likely to be blocked. Therefore, the psychological burden on the driver can also be suppressed. By these means, it is possible to provide the display system C10 that can reduce the burden on the driver while suppressing an increase in the size of the entire system. 【0246】 In addition, since side images (left side image CG23 and right side image CG24) showing the sides of the vehicle C1 are displayed in each of the one - end region C103 and the other - end region C104, the side images can be displayed as virtual images and recognized by the driver. 【0247】 Also, since the second height CH2 is greater than the first height CH1, when displaying side images in the one - end region C103 and the other - end region C104, the side images can be displayed larger in the height direction. As a result, the driver can easily check the side images. 【0248】 Also, since the second length CW2 in the vehicle width direction of each of the one - end region C103 and the other - end region C104 is greater than the first length CW1 in the vehicle width direction of the central region C102, when displaying side images in the one - end region C103 and the other - end region C104, the side images can be displayed larger in the vehicle width direction. As a result, the driver can easily check the side images. 【0249】 Also, since the one - end region C103 and the other - end region C104 overlap with respect to the horizontal line CL passing through the height center of the central region C102, when looking around the entire display virtual image C101, the driver's line - of - sight movement can be made linear, and the driver's burden can be reduced. 【0250】 Also, in the concave mirror C140, since the first mirror height CHm1 in the central mirror region C142 is different from the second mirror height CHm2 in the one - end mirror region C143 and the other - end mirror region C144, the shape of the display virtual image C101 can be realized by the shape of the concave mirror C140 without adopting a special display element. 【0251】 Also, since the central mirror region C142, the one - end mirror region C143, and the other - end mirror region C144 are divided, it is possible to manufacture them more easily compared to the case where the concave mirror C140 is an integral object. 【0252】 Furthermore, since the central mirror region C142, the one-end mirror region C143, and the other-end mirror region C144 are each held by a single holding member C149, the central mirror region C142, the one-end mirror region C143, and the other-end mirror region C144 can be held stably, and misalignment of the optical axis in each region can be suppressed. 【0253】 Furthermore, since the concave mirror C140 is incorporated into the windshield CD1, the windshield CD1 can be used as part of the optical system, enabling miniaturization of the entire system. 【0254】 Furthermore, since the display element C130 is divided into a central element C132 corresponding to the central region C102 and a pair of end elements C133 and C134 corresponding to one end region C103 and the other end region C104, a central element C132 with a simple external shape and a pair of end elements C133 and C134 can be used. 【0255】 Furthermore, during normal driving, instrument images are displayed in both the one-end region C103 and the other-end region C104, and when notification information is generated, side images are displayed in both the one-end region C103 and the other-end region C104. This reduces the inconvenience of having side images displayed in both regions during normal driving. 【0256】 Furthermore, since the lateral images viewed from the positions of one end region C103 and the other end region C104 of the displayed virtual image C101 are displayed in the one end region C103 and the other end region C104, it is possible to display a lateral image that is less unnatural to the driver. 【0257】 [Example 1] Modification 1 according to Embodiment 3 will now be described. In the following description, parts that are the same as those in Embodiment 3 and other modifications may be denoted by the same reference numerals and their descriptions may be omitted. 【0258】 Modification 1 describes an example of the external shape of the virtual image. Figures 42A to 42C are plan views showing the virtual image according to Modification 1 of Embodiment 3. In the virtual image C101a shown in Figure 42A, the upper end of the central region C102a is positioned higher than the upper ends of the one-end region C103a and the other-end region C104a. In the virtual image C101b shown in Figure 42B, the upper end of the central region C102b is positioned lower than the upper ends of the one-end region C103b and the other-end region C104b, and the lower end of the central region C102b is positioned higher than the lower ends of the one-end region C103b and the other-end region C104b. In the virtual image C101c shown in Figure 42C, the upper ends of the central region C102c and the one-end region C103c and the other-end region C104c are aligned in a straight line. In all cases, the first height CH1 and the second height CH2 are different. 【0259】 [Differentiation 2] A second modification will now be described. In the above embodiment 3, an example was given in which the center of the displayed virtual image C101 in the vehicle width direction and the center of the driver in the vehicle width direction sitting in the vehicle C1 generally coincide. However, one of the one end region C103d and the other end region C104d of the displayed virtual image C101d may be further away from the center of the driver in the vehicle width direction than the other. 【0260】 Figures 43A and 43B are plan views showing an example of the arrangement of the virtual display image C101d according to a modified example 2 of Embodiment 3. Figure 43A shows the virtual display image C101d corresponding to a left-hand drive vehicle C1, and Figure 43B shows the virtual display image C101d corresponding to a right-hand drive vehicle C1. In Figures 43A and 43B, the center of the driver in the vehicle width direction (center of the steering wheel) when seated in vehicle C1 is indicated by a dashed line. 【0261】 As shown in Figure 43A, in the case of a left-hand drive vehicle C1, the virtual image C101d is positioned such that one end region C103d is close to the driver's center, and the other end region C104d is farther from the driver's center. This ensures that the virtual image C101d is positioned with a bias suitable for a left-hand drive vehicle C1, resulting in a display that is less jarring to the driver. 【0262】 As shown in Figure 43B, in the case of a right-hand drive vehicle C1, the virtual display image C101d is positioned such that one end region C103d is far from the driver's center, and the other end region C104d is close to the driver's center. This ensures that the virtual display image C101d is positioned with a bias suitable for a right-hand drive vehicle C1, resulting in a display that is less jarring to the driver. 【0263】 [Difference 3] Modification 3 will now be described. Figure 44 is a plan view showing the display virtual image C101e according to Modification 3 of Embodiment 3. As shown in Figure 44, the display virtual image C101e is positioned above the steering wheel CS provided on the vehicle C1. The center of the display virtual image C101e in the vehicle width direction roughly coincides with the center of the steering wheel CS in the vehicle width direction. In the display virtual image C101e, one end region C103e and the other end region C104e protrude downward from the central region C102e. By positioning the steering wheel CS between the parts of the one end region C103e and the other end region C104e that protrude downward from the central region C102e, that is, in the non-display region, it is possible to suppress the steering wheel CS from obstructing the display virtual image C101e. 【0264】 Here, in the displayed virtual image C101e, the lower end of the central region C102e is shaped to follow the upper shape of the steering wheel CS. In Figure 44, the lower end of the central region C102e is curved to follow the upper circular shape of the steering wheel CS as viewed from the driver. In this way, because the lower end of the central region C102e is curved to follow the steering wheel CS, the area obstructed by the steering wheel CS can be suppressed, and the displayed virtual image C101e can be made as large as possible. Alternatively, the entire lower end of the displayed virtual image C101e may be curved to follow the steering wheel CS. Furthermore, if the shape of the steering wheel CS as viewed from the driver is not circular but, for example, trapezoidal, the lower end of the central region C102e may be shaped to follow the upper trapezoidal shape of the steering wheel CS. 【0265】 Here, when the video light irradiated from the planar display element C130 is reflected by the concave mirror, distortion occurs in the display virtual image C101e due to the curvature of the concave mirror. FIG. 45 is an explanatory diagram showing the distortion of the display virtual image C101e that occurs in the concave mirror according to Modification 3 of Embodiment 3. On the display element C130, the grid whose outer shape was rectangular becomes a grid M whose central part is curved upward as shown in FIG. 45 by reflecting off the concave mirror C140. For example, in the case of the concave mirror C140z having a rectangular shape in plan view, a region that is not used for reflection (the region outside the grid M) will occur. Thus, in order to delete the surplus portion in advance, the outer shape of the concave mirror C140e may be set to an outer shape corresponding to the outer shape of this grid M. In particular, if at least the upper end portion of the concave mirror C140e is curved convexly, a concave mirror C140e having a shape considering the distortion can be obtained. 【0266】 [Modification 4] Next, Modification 4 will be described. In Modification 4, in the concave mirror C140f, the respective curvatures of the central mirror region C142f, the one-end mirror region C143f, and the other-end mirror region C144f are different. Specifically, the respective curvatures of the one-end mirror region C143f and the other-end mirror region C144f are larger than the curvature of the central mirror region C142f. Thus, since the respective curvatures of the one-end mirror region C143f and the other-end mirror region C144f are larger than the curvature of the central mirror region C142f, the one-end region C103 and the other-end region C104 in the display virtual image C101 can be made larger than the central region C102. 【0267】 FIGS. 46A to 46D are schematic diagrams showing examples of the central mirror region C142f, the one-end mirror region C143f, and the other-end mirror region C144f according to Modification 4 of Embodiment 3. FIGS. 46A to 46D are views seen from a direction orthogonal to the optical axis with respect to the concave mirror C140f and the display element C130. 【0268】 In the concave mirror C140f shown in Figure 46A, the central mirror region C142f, the one-end mirror region C143f, and the other-end mirror region C144f are arranged in a straight line, and the curvature of the one-end mirror region C143f and the other-end mirror region C144f are greater than the curvature of the central mirror region C142f. 【0269】 In the concave mirror C140f shown in Figure 46B, the central mirror region C142f, the one-end mirror region C143f, and the other-end mirror region C144f are arranged in an arc, and the curvature of the one-end mirror region C143f and the other-end mirror region C144f are greater than the curvature of the central mirror region C142f. 【0270】 In the concave mirror C140f shown in Figure 46C, the curvature of the one-end mirror region C143f and the other-end mirror region C144f are greater than the curvature of the central mirror region C142f, but the central mirror region C142f, the one-end mirror region C143f, and the other-end mirror region C144f are separated. Specifically, the one-end mirror region C143f and the other-end mirror region C144f are positioned at the same distance as the display element C130, while the central mirror region C142f is positioned closer to the display element C130 than the one-end mirror region C143f and the other-end mirror region C144f. This makes it possible to make the viewing distances of the one-end region C103 and the other-end region C104 in the displayed virtual image C101 different from the viewing distance of the central region C102. 【0271】 In the concave mirror C140f shown in Figure 46D, the central mirror region C142f, the one-end mirror region C143f, and the other-end mirror region C144f are arranged in an arc, and the curvature of the one-end mirror region C143f and the other-end mirror region C144f are greater than the curvature of the central mirror region C142f. Furthermore, light guides 160f made of glass or transparent resin are placed between the one-end mirror region C143f and the display element C130, and between the other-end mirror region C144f and the display element C130. On the other hand, no light guide is placed between the central mirror region C142f and the display element C130. These light guides 160f make it possible to make the viewing distances of the one-end region C103 and the other-end region C104 in the displayed virtual image C101 different from the viewing distance of the central region C102. 【0272】 [Difference 5] Next, a modified example 5 will be described. The control unit C500 may control the display device C100 to overlay an interior image that mimics the interior of the vehicle C1 in a semi-transparent state onto the lateral image displayed in one end region C103 and the other end region C104 of the virtual image C101. 【0273】 Figure 47 is an explanatory diagram showing a display example according to modification 5 of Embodiment 3. In Figure 47, the other end region C104 of the display virtual image C101 is shown as an example. As shown in Figure 47, the other end region C104 displays a right-side image CG24g captured by a right-side camera and an interior image CG25g that mimics the interior, superimposed on each other. The interior image CG25g includes, for example, pillars. Since the interior image CG25g is semi-transparent, the positional relationship between the warning target and the interior can be intuitively grasped by the user. 【0274】 [Modification 6] Next, a modified example 6 will be described. The control unit C500 may control the display device C100 so that a side image showing the side of the vehicle C1 is displayed in one end region C103 and the other end region C104 of the virtual display image C101, and a rear image showing the rear of the vehicle C1 is displayed in the central region C102. 【0275】 Figure 48 is an explanatory diagram showing an example of display according to modification 6 of Embodiment 3. As shown in Figure 48, the control unit C500 displays the left-side image CG23 captured by the left-side camera in one end area C103, the rear-side image CG28h captured by the rear-side camera in the central area C102, and the right-side image CG24 captured by the right-side camera in the other end area C104. 【0276】 In this way, lateral images (left lateral image CG23, right lateral image CG24) are displayed in one end region C103 and the other end region C104 of the displayed virtual image C101, and the rear image CG28h is displayed in the central region C102. As a result, the lateral images and the rear image CG28h can be displayed in a list, allowing the driver to grasp them all at once. 【0277】 In the above embodiment 3, an example was given in which, during normal driving, an analog speedometer CG13 is displayed in one end area C103, a digital speedometer CG12 is displayed in the central area C102, and an analog tachometer CG14 is displayed in the other end area C104. However, the control unit C500 may control the display device C100 so that, during normal driving, both the one end area C103 and the other end area C104 of the virtual image C101 are turned OFF. In this case, since both the one end area C103 and the other end area C104 are turned OFF during normal driving, the inconvenience of having virtual images displayed in the one end area C103 and the other end area C104 during normal driving can be suppressed. 【0278】 (others) Although a display system relating to one or more embodiments of this disclosure has been described above based on each embodiment, this disclosure is not limited to each embodiment. Without departing from the spirit of this disclosure, various modifications to these embodiments that a person skilled in the art could conceive, or forms constructed by combining components from different embodiments, may also be included within the scope of one or more embodiments of this disclosure. [Industrial applicability] 【0279】 This disclosure can be used in a display system for displaying virtual images. [Explanation of symbols] 【0280】 1 vehicle 2 Windshields 3. Imaging Unit 10 Display Systems 100, 100k, 100m First display device 101, 101h, 101i, 101k, 101m First display virtual image 130, 130k, 130m display element 131 Full display area 140, 140m Reflector 141 Display area 190k optics 191k First reflection section 192k Second reflector 193, 193k translucent cover 200 Second display device 201, 201h Second display virtual image 210 cabinets 211 Opening 220 Cover section 230 Display elements 240 First Optical Element 250 Second optical element 500 Control Unit B1 Vehicle B2 Windshield B3 Bonnet B4 Dashboard B9 Other vehicles (warning target) B10 Display System B100 First display device B101 First virtual image (first display virtual image) B102 First display area B200 Second display device B201 Second Illusion B202 Second display area B400 Imaging Unit B500 Control Unit BL straight line BLc center line BP target (warning target) BPS display reference point BW Wall BY210 First guidance information BY220, BY220a, BY220e second guidance information BY221 Icon Information BY222, BY232b text information BY230a, BY230b, BY230c, BY230d, BY230e Third lead information C1 Vehicle C3 Imaging Unit C10 Display System C100 Display device (first display device) C101, C101a, C101b, C101c, C101d, C101e Display virtual image (first display virtual image) C102, C102a, C102b, C102c, C102e central region C103, C103a, C103b, C103c, C103d, C103e One end area C104, C104a, C104b, C104c, C104d, C104e Other end region C120 enclosure C121 Opening C130 Display Element C132 Central Element C133, C134 end elements C135 Hidden area C140, C140e, C140f, C140z concave mirror C142, C142f Central Mirror Area C143, C143f One-end mirror region C144, C144f other end mirror region C149 Retaining member C160f light guide C500 Control Unit CD1 Windshield CG12 Vehicle speedometer CG13 Vehicle speedometer CG14 Tachometer CG23 Left-side image (lateral image) CG24, G24g Right-sided image (lateral image) CG25g Interior Images CG28h Rear view CL horizontal line CS Steering D interval e. Perspective G11 speedometer G12 Tachometer G13 My car image G16 rear view G15 Frame Image G17, G19, G21 forward view G18 speedometer G20 hood frame image G23 Pillar Image G24 Surround view I Box Is within the specified range Isc center M guiding mark Mm Warning Target R1, R1n, R1m first area R2, R2a, R2b, R2d, R2e, R2f, R2g, R2j, R2n, R2m Second area R21 Superimposed Region R22 Non-overlapping region Yh arrow

Claims

[Claim 1] A first display device that displays a first virtual image in front of the user riding in the vehicle, A display system comprising a control unit for controlling the first display device, The first display device is A display element that emits image light that forms the first virtual image, A reflecting unit that reflects the image light from the display element toward the user to form the first display virtual image, and comprising The display element has a full display area that is wider than the display area corresponding to the field of view of the reflective part, Within the entire display area, the first area serves as the reference area, Within the entire display area, there is a second area which includes an overlapping portion that overlaps with at least a part of the first area and a non-overlapping portion that extends beyond the first area. The control unit controls the first display device, A first state in which the first display virtual image is formed only in the first region, Switch between a second state in which the first display virtual image is formed in the first and second regions, or in which the first display virtual image is formed only in the second region. Display system. [Claim 2] The second region extends beyond the first region in at least one direction: upward, downward, to the right, or to the left. The display system according to claim 1. [Claim 3] The second region is contained within the display area corresponding to the field of view of the reflective portion. The display system according to claim 2. [Claim 4] In at least one of the vertical and horizontal directions, the size of the second region is equivalent to the display area corresponding to the field of view of the reflective portion. The display system according to claim 2. [Claim 5] In at least one of the vertical and horizontal directions, the size of the second region extends beyond the display area corresponding to the field of view of the reflective portion. The display system according to claim 2. [Claim 6] The control unit controls the first display device to display the speedometer in the first region in both the first state and the second state. The display system according to claim 1 or 2. [Claim 7] The control unit controls the first display device to display a frame image showing the side mirror frame of the vehicle in the second state, and to display a rear image showing the rear of the vehicle in the second region, with the rear image positioned in the area corresponding to the mirror within the frame image. The display system according to claim 1 or 2. [Claim 8] The control unit controls the first display device to display a forward image showing the front of the vehicle in the second region in the second state. The display system according to claim 1 or 2. [Claim 9] The control unit controls the first display device to display, in the second state, a pillar image showing the pillar of the vehicle superimposed on a surrounding image captured by a camera positioned outside the pillar in the second region. The display system according to claim 1 or 2. [Claim 10] The control unit controls the first display device to switch from the first state to the second state based on the fulfillment of predetermined conditions. The display system according to claim 1 or 2. [Claim 11] The control unit controls the first display device to switch between the first state and the second state by sliding the first display virtual image. The display system according to claim 1 or 2. [Claim 12] The device includes a second display device that displays a second virtual image in front of the user, arranged vertically relative to the first virtual image. The control unit controls the first display device and the second display device to display an arrow that spans the first virtual image and the second virtual image. The display system according to claim 1 or 2. [Claim 13] The distance between the first virtual image and the second virtual image in a side view of the vehicle is within 0.25 diopters. The display system according to claim 12. [Claim 14] The reflective portion is provided on the windshield of the vehicle. The display system according to claim 1 or 2. [Claim 15] The system includes a viewpoint detection unit that detects the position of the user's viewpoint, The control unit controls the first display device, If the position of the viewpoint detected by the viewpoint detection unit falls within a predetermined range, the second state is set. If the position of the viewpoint detected by the viewpoint detection unit is not within a predetermined range, the first state is set. The display system according to claim 1 or 2. [Claim 16] The control unit controls the first display device, A guidance mark is displayed in the second region to guide the user's gaze toward the warning target included in the rear view image. The display system according to claim 7. [Claim 17] The control unit controls the first display device to display the guidance mark so that it gradually approaches the warning target, and to emphasize the guidance mark as the distance between the vehicle and the warning target decreases. The display system according to claim 16. [Claim 18] The control unit controls the first display device so that when the guidance mark approaches the warning target, it returns the guidance mark to its initial position and displays the guidance mark again so that it approaches the warning target. The display system according to claim 17. [Claim 19] A second display device that displays a second virtual image in front of the user and above the first virtual image, The system includes an imaging unit that images the area around the vehicle, The control unit controls the second display device and the imaging unit, The control unit, The first display device is controlled to display the vehicle surrounding information obtained by the imaging unit on the first virtual image, and the second display device is controlled to display first guidance information that promotes eye movement to the first virtual image on the second virtual image, after which, The first display device is controlled to display second guidance information on the first display virtual image, which promotes directing the vehicle's gaze forward. The display system according to claim 1 or 2. [Claim 20] When the control unit displays the second guidance information on the first display virtual image, it controls the second display device to display third guidance information on the second display virtual image to encourage the vehicle's gaze to move forward. The display system according to claim 19. [Claim 21] The control unit controls the second display device to display the third guidance information on the second display virtual image so that the gaze is guided to a warning target located in front of the vehicle. The display system according to claim 20. [Claim 22] The control unit controls the second display device to display text information assisting eye-tracking guidance, along with the third guidance information, on the second display virtual image. The display system according to claim 20. [Claim 23] The control unit controls the second display device to highlight the edge of the second display virtual image as the third guidance information. The display system according to claim 20. [Claim 24] When the control unit displays the second guidance information on the first display virtual image, it controls the first display device to prevent the vehicle surrounding information from being displayed on the first display virtual image. The display system according to claim 19. [Claim 25] When the control unit displays at least one of the second guidance information and the third guidance information, it controls the first display device to also display the vehicle surrounding information on the first display virtual image. The display system according to claim 20. [Claim 26] If the control unit determines, based on the vehicle surrounding information, that a warning target located in front of the vehicle is not in a blind spot for the user, it controls the first display device to prevent the vehicle surrounding information from being displayed in the first display virtual image. The display system according to claim 19. [Claim 27] The control unit controls the first display device to prevent the vehicle surrounding information from being displayed on the first display image when the vehicle speed exceeds a certain speed. The display system according to claim 19. [Claim 28] The control unit controls the first display device to prevent the vehicle surrounding information from being displayed in the first display virtual image when the display time of the vehicle surrounding information exceeds a certain period of time. The display system according to claim 19. [Claim 29] In the first virtual image, the first height in the central region in the vehicle width direction is different from the second heights of the one end region and the other end region in the vehicle width direction. The display system according to claim 1. [Claim 30] The control unit controls the first display device such that a side image showing the side of the vehicle is displayed in the one-end region and the other-end region of the first display virtual image. The display system according to claim 29. [Claim 31] The second height is greater than the first height. The display system according to claim 29. [Claim 32] The lengths in the vehicle width direction of the one-end region and the other-end region in the first display virtual image are greater than the length in the vehicle width direction of the central region. The display system according to claim 29. [Claim 33] In the first virtual image display, one of the one-end region and the other-end region is further from the center in the vehicle width direction of the user than the other. The display system according to claim 29. [Claim 34] The one-end region and the other-end region in the first virtual image overlap with a horizontal line passing through the height center of the central region. The display system according to claim 29. [Claim 35] In the first virtual image, the one-end region and the other-end region protrude downward from the central region. The display system according to claim 34. [Claim 36] The lower end of the first virtual image is shaped to conform to the upper shape of the steering wheel provided in the vehicle. The display system according to claim 35. [Claim 37] The first display device comprises a display element that forms image light which constitutes the first virtual display image, and an optical system that reflects the image light emitted from the display element to form the first virtual display image. The final reflective surface in the optical system is a concave mirror. In the concave mirror, the height of the first mirror in the central mirror region in the vehicle width direction is different from the height of the second mirror in the one-end mirror region and the other-end mirror region in the vehicle width direction. The display system according to claim 29. [Claim 38] The upper end of the concave mirror is curved in a convex shape. The display system according to claim 37. [Claim 39] The concave mirror is divided into a central mirror region, a one-end mirror region, and a other-end mirror region. The display system according to claim 37. [Claim 40] The central mirror region, the one-end mirror region, and the other-end mirror region are held by a single holding member. The display system according to claim 39. [Claim 41] The curvature of the one-end mirror region and the other-end mirror region are greater than the curvature of the central mirror region. The display system according to claim 39. [Claim 42] The concave mirror is provided on the windshield of the vehicle. The display system according to claim 37. [Claim 43] The first display device comprises a display element that forms image light which constitutes the first virtual display image, and an optical system that reflects the image light emitted from the display element to form the first virtual display image. The display element is divided into a central element corresponding to the central region in the first virtual display image, and a pair of end elements corresponding to one end region and the other end region in the first virtual display image. The display system according to claim 29. [Claim 44] The control unit, During normal driving, the first display device is controlled so that instrument images are displayed in the one-end region and the other-end region of the first virtual display image. When notification information is generated, the first display device is controlled so that a side image showing the side of the vehicle is displayed in the one-end region and the other-end region of the first display virtual image, respectively. The display system according to claim 29. [Claim 45] The control unit, During normal driving, the first display device is controlled such that the one-end region and the other-end region of the first display virtual image are both turned OFF. When notification information is generated, the first display device is controlled so that a side image showing the side of the vehicle is displayed in the one-end region and the other-end region of the first display virtual image, respectively. The display system according to claim 29. [Claim 46] The control unit, The first display device is controlled such that a side image showing the side of the vehicle is displayed in the one-end region and the other-end region of the first display virtual image, and a rear image showing the rear of the vehicle is displayed in the central region. The display system according to claim 29. [Claim 47] The control unit, The first display device is controlled so that the lateral image, with the one end region and the other end region of the first display virtual image as viewpoints, is displayed in the one end region and the other end region. The display system according to claim 30. [Claim 48] The control unit controls the first display device so that an interior image, which mimics the interior of the vehicle, is superimposed on the side image in a semi-transparent state. The display system according to claim 30.

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