JP6561616B2 - In-vehicle head-up display device and in-vehicle display system - Google Patents

Description

  The present invention relates to an in-vehicle head-up display device and an in-vehicle display system.

  2. Description of the Related Art Conventionally, an in-vehicle head-up display device (an in-vehicle HUD device) is known in which a viewer visually recognizes a virtual image superimposed on a real scene seen through a windshield from a vehicle interior by projecting display light related to the image onto the windshield of the vehicle. ing.

  For example, as described in Patent Document 1, the in-vehicle HUD device displays a frame surrounding a front vehicle as a target object as a virtual image. Thereby, the viewer can recognize the front vehicle in a frame reliably.

JP, 2015-074391, A

  However, the vehicle may be inclined due to, for example, loading of luggage into the trunk or uneven occupant arrangement. Due to the inclination of the vehicle, the frame as the virtual image may be shifted with respect to the object (for example, the preceding vehicle), and the viewer may feel uncomfortable.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an in-vehicle head-up display device and an in-vehicle display system that reduce a sense of discomfort given to a viewer due to the inclination of the vehicle.

In order to achieve the above object, an in-vehicle head-up display device according to a first aspect of the present invention is mounted on a vehicle and displays an image so as to be superimposed on a real scene seen from the interior of the vehicle. An emphasis symbol having a selection range including at least a part of the object detected by an object detection device for detecting an object present around the vehicle is displayed as the image, and the vehicle is tilted. Bei example the display control unit the selection is set large enough the emphasis symbols inclination of the vehicle detected is larger by the slope detector for detecting, the display control unit, the inclination of the vehicle is less than the threshold value When the first emphasis symbol that is the emphasis symbol is displayed and the vehicle inclination is equal to or greater than the threshold, the selection range is larger than the first emphasis symbol. A second emphasis symbol, which is the emphasis symbol, is displayed to guide the vehicle occupant to correct the weight balance of the vehicle, and after the guidance, the inclination of the vehicle is equal to or greater than the threshold value. The second emphasis symbol is displayed, and when the vehicle inclination is less than the threshold value, the first emphasis symbol is displayed, and the threshold value is a shift of the first emphasis symbol with respect to the object. Accordingly, the inclination of the vehicle is expected to give the viewer a sense of incongruity .

In order to achieve the above object, an in-vehicle display system according to a second aspect of the present invention includes an object detection device that detects an object present around a vehicle, an inclination detection device that detects the inclination of the vehicle, A vehicle-mounted head-up display device that displays an image so as to be superimposed on a real scene seen from the interior of the vehicle, wherein the vehicle-mounted head-up display device is at least one of the objects detected by the object detection device. display enhancement symbols with a selection including parts as the image, e Bei display control unit for a large set the selection range of the tilt detecting device as the enhancement symbol large inclination of the vehicle detected by the The display control unit displays a first emphasis symbol that is the emphasis symbol when the vehicle tilt is less than a threshold value, and the vehicle tilt is equal to or greater than the threshold value. Display a second emphasis symbol that is the emphasis symbol having a larger selection range than the first emphasis symbol, and guide the vehicle occupant to correct the weight balance of the vehicle. After the guidance, when the vehicle inclination is equal to or greater than the threshold value, the second emphasis symbol is displayed. When the vehicle inclination is less than the threshold value, the first emphasis symbol is displayed, and the threshold value is displayed. Is set to the inclination of the vehicle that is expected to give the viewer a sense of incongruity with the shift of the first emphasis symbol with respect to the object .

  According to the present invention, it is possible to reduce the uncomfortable feeling given to the viewer by the inclination of the vehicle.

It is a block diagram which shows the structure of the vehicle-mounted display system which concerns on one Embodiment of this invention. It is a mimetic diagram of a vehicle carrying in-vehicle HUD concerning one embodiment of the present invention. It is the schematic which shows the structure of the vehicle-mounted HUD which concerns on one Embodiment of this invention. (A) which concerns on one Embodiment of this invention is a figure which shows the virtual image which the 1st emphasis symbol superimposed on the front vehicle visible from a passenger | crew, (b) is the 2nd emphasis symbol superimposed on the front vehicle visible to a passenger | crew. It is a figure which shows the made virtual image. (A) is a comparative example with one Embodiment of this invention, Comprising: When the own vehicle inclines, it is a figure which shows the virtual image which concerns on the 1st emphasis symbol seen from a passenger | crew, (b) is this invention It is a figure which shows the virtual image on which the 2nd emphasis symbol was superimposed on the front vehicle seen from a passenger | crew when the own vehicle which concerns on one Embodiment leans. (A) which concerns on one Embodiment of this invention is a figure which shows the virtual image which the 1st emphasis symbol superimposed on the front vehicle visible from a passenger | crew, (b) is the 2nd emphasis symbol superimposed on the front vehicle visible to a passenger | crew. It is a figure which shows the made virtual image. (A) is a comparative example with respect to one embodiment of the present invention, and is a diagram showing a virtual image in which a first emphasis symbol is superimposed on a forward vehicle seen by an occupant when the vehicle is tilted, (b) These are figures which show the virtual image which the 2nd emphasis sign superimposed on the front vehicle which can see from a passenger | crew when a vehicle leans based on one Embodiment of this invention. It is a flowchart which shows the process sequence of the program which concerns on the setting of the emphasis symbol which the display control part which concerns on one Embodiment of this invention performs. (A) which concerns on the modification of this invention is a figure which shows the virtual image which displays the 2nd emphasis symbol which points the front vehicle which can be seen from a passenger | crew, (b) is a selection range of the said 2nd emphasis symbol virtually FIG.

  An in-vehicle display system including an in-vehicle head-up display device according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the in-vehicle display system 1 is a system mounted on a vehicle 2, and includes an in-vehicle head-up display device (an in-vehicle HUD device) 10 and a front situation detection device 101 that is an example of an object detection device. And an inclination detecting device 107.

  The front situation detection device 101 detects a situation in front of the vehicle 2 and includes, for example, a stereo camera 101a and a front situation analysis unit 101b. As shown in FIG. 2, the stereo camera 101a includes a pair of cameras disposed on both sides of the rearview mirror, for example, on the ceiling in the passenger compartment. The stereo camera 101a outputs image information in front of the captured vehicle 2 to the front situation analysis unit 101b. The front situation analysis unit 101b analyzes the image information captured by the stereo camera 101a, and outputs the analysis result to the in-vehicle HUD device 10 (exactly described later, the display control unit 14) as information related to the front situation of the vehicle 2. . The information related to the front situation of the vehicle 2 is information including the position and shape of a front vehicle, an obstacle, a white line, or the like that is an object existing in front of the vehicle 2.

  The tilt detection device 107 is a device that detects the tilt of the vehicle 2. For example, each of the three-axis acceleration sensor 107a and the three-axis acceleration sensor 107a that detect X-axis, Y-axis, and Z-axis accelerations orthogonal to each other. An inclination calculation unit 107b that calculates the inclination degree of the vehicle 2 based on the detection result on the shaft. The inclination of the vehicle 2 can be caused by the uneven distribution of luggage and passengers in the passenger compartment. The inclination calculation unit 107b stores in advance the detection result of the triaxial acceleration sensor 107a when the vehicle 2 is parked on a flat ground and the vehicle 2 is not inclined, and the stored detection result and the current triaxial acceleration sensor The inclination of the vehicle 2 is calculated based on the comparison with the detection result 107a, and the calculation result is output to the in-vehicle HUD device 10 (more precisely, the display control unit 14 described later). The triaxial acceleration sensor 107a may be newly provided for the in-vehicle display system 1, or may be provided in advance in the vehicle 2, for example, a skid prevention device or vehicle for stabilizing the behavior of the vehicle. An acceleration sensor used in a stable control system or the like may be used.

  The in-vehicle HUD device 10 projects the display light L onto the windshield 3 of the vehicle 2 as shown in FIG. The viewer (occupant) 5 receives the display light L reflected on the windshield 3 and can visually recognize the virtual image V superimposed on a real scene object (for example, a forward vehicle) seen through the windshield 3.

  Specifically, as shown in FIG. 3, the in-vehicle HUD device 10 includes a display control unit 14, a display 15, first and second mirror members 11 and 12, and a housing 13.

  The housing 13 is formed of a non-translucent resin material or a metal material and has a hollow, substantially rectangular parallelepiped shape. An opening 13 a is formed in the housing 13 at a position facing the windshield 3. The housing 13 includes a curved plate-like window 16 that closes the opening 13a. The window portion 16 is made of a translucent resin material such as acrylic through which the display light L passes. The above-described components of the in-vehicle HUD device 10 are accommodated in the housing 13.

  The display 15 generates display light L representing a predetermined image, and emits the generated display light L toward the first mirror member 11. The first mirror member 11 is a plane mirror and reflects the display light L emitted from the display unit 15 toward the second mirror member 12. The second mirror member 12 is a concave mirror and reflects the display light L from the first mirror member 11 while enlarging it toward the windshield 3. The viewer 5 receives the display light L reflected on the windshield 3 and can visually recognize the virtual image V superimposed on the real scene.

  The in-vehicle HUD device 10 displays, as the virtual image V, for example, a guide route image, a white line recognition image, a collision warning image, a forward vehicle lock image, or an inter-vehicle distance image. Specifically, the guidance route image is an image for guiding a viewer by superimposing a display related to the route to the destination on a real road. When the vehicle is about to deviate from the lane, the white line recognition image superimposes an emphasis symbol in the vicinity of the white line so that the viewer recognizes the presence of the white line and suppresses the lane departure or simply displays the emphasis symbol in the vicinity of the white line. It is an image for making a viewer recognize the presence of a white line by superimposing. The collision warning image is an image for urging the viewer to pay attention by superimposing an emphasis symbol in the vicinity of an object (a forward vehicle or an obstacle) on the lane of the host vehicle. The front vehicle lock image is a front image in which an emphasis symbol is superimposed on the following vehicle to follow the viewer when using adaptive cruise control (ACC) that controls the speed of the host vehicle to follow the preceding vehicle. This is an image for recognizing a vehicle. The inter-vehicle distance image is an image for causing the viewer 5 to recognize the inter-vehicle distance by superimposing an index related to the distance between the preceding vehicle and the own vehicle on the lane between the preceding vehicle and the own vehicle.

  The display control unit 14 recognizes a real scene object (for example, a front vehicle) through the windshield 3 based on a detection result (information on the front situation of the vehicle 2) from the front situation detection device 101, and the object. The viewer 5 is caused to visually recognize the virtual image V matched to the above.

  Specifically, for example, as shown in FIGS. 4A and 4B, the display control unit 14 emphasizes the front vehicle W1 corresponding to the object as a virtual image V related to the collision warning video. Two emphasis symbols Va1 and Va2 are displayed. 4A and 4B show the first and second emphasis symbols Va1 and Va2 for the forward vehicle W1 when the vehicle 2 has a small inclination. The first and second emphasis symbols Va1 and Va2 are displayed so that “!” Is displayed in a substantially equilateral triangle so as to overlap a part of the front vehicle W1 in the actual scene. The second emphasis symbol Va2 is formed by a substantially equilateral triangle having an area larger than that of the first emphasis symbol Va1. In this example, the areas of the first and second emphasis symbols Va1 and Va2 match the selection range of the first and second emphasis symbols Va1 and Va2. That is, the selection range of the second emphasis symbol Va2 is formed larger than the selection range of the first emphasis symbol Va1.

  For example, as shown in FIGS. 6 (a) and 6 (b), the display control unit 14 uses a broken line to surround the front vehicle W1 with a broken line so as to emphasize the front vehicle W1. And second emphasis symbols Vb1 and Vb2. 6 (a) and 6 (b) show first and second emphasis symbols Vb1 and Vb2 for the forward vehicle W1 when the inclination of the vehicle 2 is small. As shown in FIG. 6A, the first emphasis symbol Vb1 has a shape along the outer shape of the forward vehicle W1. Therefore, the gap between the first emphasis symbol Vb1 and the outer shape of the preceding vehicle W1 is set small. As shown in FIG. 6B, the second emphasis symbol Vb2 has a rectangular shape that encloses the forward vehicle W1. Therefore, the gap between the second emphasis symbol Vb2 and the outer shape of the preceding vehicle W1 is larger than the gap between the first emphasis symbol Vb1 and the outer shape of the preceding vehicle W1. The selection range of the first and second emphasis symbols Vb1 and Vb2 is an area within the broken lines. The selection range of the second emphasis symbol Vb2 is formed larger than the selection range of the first emphasis symbol Vb1.

  When the inclination of the vehicle 2 is less than the threshold value, the display control unit 14 uses the first emphasis symbols Va1 and Vb1 as the object (front vehicle W1) as shown in FIGS. 4 (a) and 6 (a). To emphasize. Further, when the inclination of the vehicle 2 is equal to or greater than the threshold, the display control unit 14 emphasizes the preceding vehicle W1 with the second emphasis symbols Va2 and Vb2, as shown in FIGS. 5 (b) and 7 (b). To do. As shown in FIG. 5 (a), if the forward vehicle W1 is emphasized with the first emphasis symbol Va1 having a narrow selection range when the inclination of the vehicle 2 is equal to or greater than the threshold value, the first emphasis symbol Va1 is obtained. Since the vehicle deviates from the preceding vehicle W1, the object emphasized by the first emphasis symbol Va1 becomes unclear, which is not preferable. In this regard, in the present embodiment, when the inclination of the vehicle 2 is equal to or greater than the threshold value, as shown in FIG. 5B, the second emphasis symbol Va2 having a larger selection range than the first emphasis symbol Va1 is ahead. By emphasizing the vehicle W1, the state where the second emphasis symbol Va2 and the selection range thereof overlap with a part of the preceding vehicle W1 is maintained. Therefore, even when the inclination of the vehicle 2 is large, the forward vehicle W1 emphasized by the second emphasis symbol Va2 becomes clear. Similarly, as shown in FIG. 7 (a), if the preceding vehicle W1 is emphasized with the first emphasis symbol Vb1 having a narrow selection range when the inclination of the vehicle 2 is equal to or greater than the threshold value, the preceding vehicle W1 is displayed. On the other hand, since the first emphasis symbol Vb1 is shifted, the viewer 5 feels uncomfortable. In this regard, in the present embodiment, when the inclination of the vehicle 2 is equal to or greater than the threshold value, as shown in FIG. 7B, the second emphasis symbol Vb2 having a larger selection range than the first emphasis symbol Vb1 moves forward. By emphasizing the vehicle W1, the state in which the second emphasis symbol Vb2 includes the front vehicle W1 is maintained. Therefore, even when the inclination of the vehicle 2 is large, the uncomfortable feeling given to the viewer 5 can be reduced.

  Next, the processing procedure of the program relating to the setting of the emphasis symbol executed by the display control unit 14 will be described with reference to the flowchart of FIG.

  The display control unit 14 waits for the ignition (IGN) switch of the vehicle 2 to switch from the off state to the on state (step S1; NO). When the display control unit 14 determines that the IGN switch is switched from the off state to the on state (step S1; YES), the display control unit 14 acquires the tilt information of the vehicle 2 from the tilt detection device 107 (step S2).

  The display control unit 14 determines whether or not the inclination of the vehicle 2 acquired in step S2 is equal to or greater than a preset threshold value Th (step S3). This threshold Th is set to the inclination of the vehicle 2 that is expected to give the viewer 5 a sense of discomfort as the first emphasized symbols Va1 and Vb1 shift with respect to the object (for example, the forward vehicle W1).

  When the display control unit 14 determines that the inclination of the vehicle 2 is less than the threshold Th (step S3; NO), as shown in FIG. 4 (a) or FIG. 6 (a), the emphasis symbol that emphasizes the preceding vehicle W1. Are set to the first emphasis symbols Va1 and Vb1 (step S8), and this flowchart is ended (END). On the other hand, when the display control unit 14 determines that the inclination of the vehicle 2 is equal to or greater than the threshold Th (step S3; YES), the display control unit 14 displays guidance for correcting the weight balance of the vehicle 2 to the occupant to display the virtual image V. (Step S4). The viewer 5 moves the loading position of the luggage or moves the passenger's seat along the guidance. In addition, you may perform this guidance through the sound from a speaker instead of the display through the virtual image V, or with the display through the virtual image V.

  The display control unit 14 waits for a fixed time to elapse after the guidance (step S4) (step S5; NO). This fixed time is set to a time required for the viewer 5 to correct the weight balance of the vehicle. When it is determined that a certain time has elapsed after the guidance (step S5; YES), the display control unit 14 again determines whether or not the inclination of the vehicle 2 is equal to or greater than the threshold Th (step S6). When the display control unit 14 determines that the inclination of the vehicle 2 is equal to or greater than the threshold Th (step S6; YES), as shown in FIG. 5B or FIG. 7B, an emphasis symbol that emphasizes the preceding vehicle W1. Is set to the second emphasis symbols Va2 and Vb2 (step S7), and this flowchart is ended (END). On the other hand, when the weight balance of the vehicle 2 is corrected by the above guidance, the display control unit 14 determines that the inclination of the vehicle 2 is less than the threshold value Th (step S6; NO), and FIG. As shown in FIG. 6A, the emphasis symbol for emphasizing the preceding vehicle W1 is set to the first emphasis symbols Va1 and Vb1 (step S8), and this flowchart is ended (END).

  After executing the flowchart of FIG. 8, the display control unit 14 grasps the position of the forward vehicle W <b> 1 based on information about the forward situation of the vehicle 2 from the forward situation detection device 101 until the IGN switch is switched to the off state. . Then, the display control unit 14 moves the position of the first emphasis symbol Va1, Vb1 or the second emphasis symbol Va2, Vb2 set in step S7 or step S8 so as to follow the preceding vehicle W1. And display.

(effect)
As mentioned above, according to one Embodiment described, there exist the following effects.

  (1) The vehicle 2 includes a front situation detection device 101 that detects a forward vehicle W1 (object) that exists in front of the vehicle 2, a tilt detection device 107 that detects the tilt of the vehicle 2, and a vehicle interior of the vehicle 2. And a vehicle-mounted head-up display device (vehicle-mounted HUD device) 10 that displays an image (virtual image V) so as to be superimposed on a visible real scene. The in-vehicle HUD device 10 displays the emphasis symbols Va1, Va2, Vb1, Vb2 having a selection range including at least a part of the forward vehicle W1 (target object) detected by the forward situation detection device 101 as an image. Is provided. When the inclination of the vehicle 2 detected by the inclination detection device 107 is large, the display control unit 14 displays the second emphasis symbols Va2 and Vb2 having a selection range larger than the first emphasis symbols Va1 and Vb1. By increasing the selection range of the emphasis symbol, as shown in FIGS. 5B and 7B, the second vehicle emphasis Va2 and Vb2 emphasizes the forward vehicle W1 without any discomfort for the viewer 5. State is maintained. Accordingly, the selection range of the first emphasis symbol Va1 is separated from the preceding vehicle W1 as shown in FIG. 5A, or the selection range of the first emphasis symbol Vb1 as shown in FIG. 7A. It is suppressed that the front vehicle W1 is not included. Thereby, the uncomfortable feeling given to the viewer 5 can be reduced.

  Even when the inclination of the vehicle 2 is large, as shown in FIG. 5B, the selection range of the second emphasis symbol Va2 is maintained in a state where it overlaps a part of the forward vehicle W1, The viewer 5 can recognize the forward vehicle W1. For this reason, even when the inclination of the vehicle 2 is large, more accurate information can be presented to the viewer 5.

  (2) The display control unit 14 displays the first emphasis symbols Va1 and Vb1 when the inclination of the vehicle 2 is less than the threshold Th, and the first emphasis symbol when the inclination of the vehicle 2 is greater than or equal to the threshold Th. Second emphasis symbols Va2 and Vb2 having a selection range larger than Va1 and Vb1 are displayed. This threshold Th is set to the inclination of the vehicle 2 that is expected to give the viewer a sense of discomfort with the shift of the first emphasis symbols Va1, Vb1 with respect to the preceding vehicle W1. As described above, the first and second emphasis symbols Va1, Va2, Vb1, and Vb2 are selectively used after the magnitude of the inclination of the vehicle 2 is determined using one threshold value. Therefore, the uncomfortable feeling given to the viewer 5 can be reduced by simple control by the display control unit 14 as described above.

  (3) When the inclination of the vehicle 2 is equal to or greater than the threshold Th, the display control unit 14 provides guidance to the viewer (occupant) 5 to urge correction of the weight balance of the vehicle 2. Thereafter, the display control unit 14 displays the second emphasis symbols Va2 and Vb2 again when the inclination of the vehicle 2 is equal to or greater than the threshold Th, and when the inclination of the vehicle 2 is less than the threshold Th, Emphasis symbols Va1 and Vb1 are displayed. In accordance with this guidance, when the viewer 5 moves the load position of the load or the passenger moves the seat, the first emphasis symbols Va1 and Vb1 having a relatively narrow selection range are displayed. Accordingly, the viewer 5 can more reliably recognize the forward vehicle W1 through the first emphasis symbols Va1 and Vb1.

  (4) When the display control unit 14 determines that the ignition switch has been switched from the off state to the on state (step S1; YES), the display control unit 14 performs a process subsequent to step S2, that is, a process related to setting of an emphasis symbol. Here, when the ignition switch is switched to the on state, the vehicle 2 is in a stopped state. Therefore, it is suppressed that the value which concerns on the inclination of the vehicle 2 which the display control part 14 acquires in step S2 is mixed with the disturbance accompanying the driving | running | working of the vehicle 2 (specifically deceleration of a vehicle, acceleration, right turn or left turn etc.). Is done. Therefore, the display control unit 14 can set an emphasis symbol according to the actual inclination of the vehicle 2.

(Modification)
In addition, the said embodiment can be implemented with the following forms which changed this suitably.

  In the above embodiment, the front situation detection apparatus 101 includes the stereo camera 101a. However, the front situation detection apparatus 101 replaces the stereo camera 101a or in addition to the stereo camera 101a, an infrared camera, a millimeter wave laser, or the like. A short distance detecting radar or a sonar using ultrasonic waves may be provided. Moreover, since the front situation detection apparatus 101 should just be able to grasp | ascertain the situation ahead of the vehicle 2, you may comprise the navigation system which pinpoints the position of the vehicle 2 and can acquire the information regarding the road where the vehicle 2 drive | works. . Moreover, the front situation detection apparatus 101 may be comprised by the communication means which can communicate with the exterior. In this configuration, the forward situation detection device 101 may estimate the situation ahead of the vehicle 2 by communicating with an external communication device such as a road traffic information communication system.

  In the above embodiment, the display control unit 14 uses the first and second emphasis symbols Va1, Va2, Vb1, and Vb2 properly based on whether or not the inclination of the vehicle 2 is equal to or greater than the threshold value Th. However, the threshold value is not limited to one, and a plurality of threshold values may be set. In this case, the display control unit 14 uses three or more emphasis symbols properly based on a comparison between the inclination of the vehicle 2 and a plurality of threshold values. Furthermore, the display control unit 14 may set the size of the highlight symbol selection range according to the magnitude of the inclination of the vehicle 2. Thereby, an emphasis symbol more suitable for the inclination of the vehicle 2 is set.

  In the above embodiment, the inclination calculation unit 107b of the inclination detection device 107 calculates the inclination of the vehicle 2, but the display control unit 14 may perform this calculation process. Similarly, the display control unit 14 may perform the process executed by the front situation analysis unit 101b of the front situation detection apparatus 101.

  In the above embodiment, as shown in FIG. 6B, the second emphasis symbol Vb2 is formed so as to surround the forward vehicle W1, but the present invention is not limited to this. For example, as shown in FIG. 9A, the second emphasis symbol Vc2 may be an arrow icon. In the case of an arrow icon, a predetermined area indicated by the arrow is a selection area A, as indicated by a one-dot chain line in FIG. That is, the second emphasis symbol Vc2 and the selection range A are set in different areas. Also in this case, the selection range A of the second emphasis symbol Vc2 is larger than the selection range of the first emphasis symbol Vb1.

  In the above embodiment, the forward vehicle W1 as the object is emphasized by the first and second emphasis symbols Va1, Va2, Vb1, Vb2, and Vc2. However, the display control unit 14 may emphasize a white line on the road, a pedestrian, an obstacle, or the like through an emphasis symbol. In this case, the emphasis symbol is set in a shape corresponding to a white line, a pedestrian, an obstacle, or the like. And the display control part 14 enlarges the selection range of an emphasis symbol, so that the inclination of the vehicle 2 is large similarly to the said embodiment.

  In the above-described embodiment, when the display control unit 14 determines that the ignition switch has been switched from the off state to the on state (step S1; YES), the display control unit 14 performs the processing after step S2. Instead of this step S1, the display control unit 14 determines whether or not the vehicle speed is zero, and may execute the processing after step S2 only when it is determined that the vehicle speed is zero. According to this configuration, even when the weight balance of the vehicle 2 is corrected after the vehicle 2 starts running, the second emphasis symbol Va2, Vb2 can be switched to the first emphasis symbol Va1, Vb1 when the vehicle stops. It becomes. Further, the process of step S1 may be omitted. In this case, the display control unit 14 may repeatedly execute the processes of steps S2 to S8 while the vehicle 2 is traveling.

  In the above embodiment, in step S3 in FIG. 8, the display control unit 14 determines the vehicle tilt based on the tilt information at the time in step S2, but the display control unit 14 shifts the time series, for example. An average value of the acquired inclinations of the plurality of vehicles may be calculated, and it may be determined whether the calculated average value is equal to or greater than a predetermined threshold value. Accordingly, it is determined that the vehicle 2 is tilted due to the temporary tilt of the vehicle 2, and the second emphasis symbol Vb2 is suppressed from being displayed. Further, in the above embodiment, in step S4 of FIG. 8, the display control unit 14 waits for a certain period of time to elapse after providing guidance to the occupant to correct the weight balance of the vehicle 2; The processing after S6 was executed. Further, the display control unit 14 may execute the processing after step S6 even when it is determined that the vehicle speed is not zero before the fixed time elapses in step S5 or during the processing of steps S2 to S5. Thereby, when the vehicle 2 starts traveling, the final inclination of the vehicle 2 can be determined without delay, and an emphasis symbol corresponding to the inclination can be displayed.

  In the embodiment described above, the inclination detection device 107 detects the inclination of the vehicle 2 based on the detection result of the triaxial acceleration sensor 107a. However, the inclination detection device 107 is not limited to the triaxial acceleration sensor 107a as long as it can detect the inclination of the vehicle 2, and may employ a uniaxial or biaxial acceleration sensor. Further, the tilt detection device 107 may detect the tilt of the vehicle 2 based on image information from the stereo camera 101a. Specifically, the inclination detection device 107 compares the image information from the stereo camera 101a when the vehicle 2 stored in advance has no inclination and the current image information from the stereo camera 101a to compare the inclination of the vehicle 2. Is detected. In this case, since the three-axis acceleration sensor 107a is unnecessary, the in-vehicle display system 1 is configured more simply.

  In the above embodiment, the display control unit 14 is provided inside the housing 13 of the in-vehicle HUD device 10, but may be provided outside the housing 13.

  In the above embodiment, the in-vehicle HUD device 10 projects the display light L onto the windshield 3, but the present invention is not limited to this, and the display light L is applied to a combiner configured by a plate-shaped half mirror, a hologram element, or the like. May be projected.

DESCRIPTION OF SYMBOLS 1 ... In-vehicle display system 2 ... Vehicle 3 ... Windshield 5 ... Viewer (occupant)
10: In-vehicle head-up display device (in-vehicle HUD device)
DESCRIPTION OF SYMBOLS 14 ... Display control part 15 ... Indicator 101 ... Forward situation detection apparatus 101a ... Stereo camera 101b ... Forward situation analysis part 107 ... Inclination detection apparatus 107a ... Triaxial acceleration sensor 107b ... Inclination calculation part Va1, Vb1 ... 1st emphasis symbol Va2, Vb2, Vc2 ... Second emphasis symbol W1 ... Vehicle ahead

Claims (2)

An on-vehicle head-up display device that is mounted on a vehicle and displays an image so as to be superimposed on a real scene seen from the vehicle interior of the vehicle,
An inclination for detecting an inclination of the vehicle by displaying, as the image, an emphasis symbol having a selection range including at least a part of the object detected by an object detection device that detects an object existing around the vehicle. e Bei the display control unit the selection is set large enough the emphasis symbols inclination of the vehicle detected is larger by detecting device,
The display control unit displays a first emphasis symbol that is the emphasis symbol when the inclination of the vehicle is less than a threshold value,
When the inclination of the vehicle is equal to or greater than the threshold value, a second emphasis symbol that is the emphasis symbol having the selection range larger than the first emphasis symbol is displayed, and guidance for urging correction of the weight balance of the vehicle is displayed. When the vehicle tilt is greater than or equal to the threshold after the guidance, the second emphasis symbol is displayed. When the vehicle tilt is less than the threshold, the first Display the emphasis symbol
The threshold is set to the inclination of the vehicle that is expected to give a viewer a sense of discomfort with a shift of the first emphasis symbol with respect to the object.
A vehicle-mounted head-up display device. An object detection device for detecting an object present around the vehicle;
An inclination detection device for detecting the inclination of the vehicle;
An in-vehicle head-up display device that displays an image so as to be superimposed on a real scene seen from the vehicle interior of the vehicle,
The in-vehicle head-up display device displays an emphasis symbol having a selection range including at least a part of the object detected by the object detection device as the image, and the vehicle-mounted head-up display device detects the vehicle detected by the inclination detection device. e Bei display control unit to set a large the selection of the more large gradient of emphasis symbol,
The display control unit displays a first emphasis symbol that is the emphasis symbol when the inclination of the vehicle is less than a threshold value,
When the inclination of the vehicle is equal to or greater than the threshold value, a second emphasis symbol that is the emphasis symbol having the selection range larger than the first emphasis symbol is displayed, and guidance for urging correction of the weight balance of the vehicle is displayed. When the vehicle tilt is greater than or equal to the threshold after the guidance, the second emphasis symbol is displayed. When the vehicle tilt is less than the threshold, the first Display the emphasis symbol
The threshold is set to the inclination of the vehicle that is expected to give a viewer a sense of discomfort with a shift of the first emphasis symbol with respect to the object.
An in-vehicle display system characterized by that.

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