JP6471575B2 - Vehicle display control device and vehicle display unit - Google Patents

Description

  The present invention relates to a vehicle display control device and a vehicle display unit including the same.

  2. Description of the Related Art Conventionally, a head-up display (HUD) that projects a display image onto a projection member that transmits an outside scene in the host vehicle and displays the display image in a virtual image so that the user can visually recognize the display image is widely known. .

  In order to control such a virtual image display by HUD, Patent Document 1 discloses that when a front obstacle in an outside scene is detected, the virtual image display state of a bright spot as a display image is associated with the detected front obstacle. A vehicle display control technique for controlling the vehicle is disclosed. Here, the bright spot is blinked, for example, so that even if a front obstacle is present in the peripheral visual field of the user, the user's vision can be stimulated and alerted.

Japanese Patent Laid-Open No. 10-246640

  However, the disclosed technique of Patent Document 1 does not assume that the virtual image display position where the bright spot is formed is changed in the front-rear direction with respect to the user. Here, in the situation where the virtual image display position does not change in the front-rear direction, if the virtual image display of the bright spot is repeated, the user becomes accustomed, and the alerting effect may not be sustained. Further, in the technique disclosed in Patent Document 1, since a virtual image of a bright spot is not displayed when a front obstacle is present in the central visual field of the user, for example, when the user is driving freely, the forward obstruction of the central visual field is not achieved. There is a possibility that the alerting effect required for objects may be reduced.

  As described above, when the alerting effect becomes difficult or lowers, the discovery of the front obstacle by the user is delayed, so there is room for improvement in ensuring the safety and security of the user.

  Therefore, the present invention has been made in view of the above-described problems, and its object is to provide a vehicle for ensuring the safety and security of the user by continuously providing a high alerting effect on a front obstacle. An object of the present invention is to provide a display control device and a vehicle display unit including the display control device.

  The technical means of the invention for achieving the object will be described below. The reference numerals in parentheses described in the claims and in this section disclosing the technical means of the invention indicate the correspondence with the specific means described in the embodiment described in detail later. It is not intended to limit the technical scope of the invention.

The first invention disclosed in order to solve the above-mentioned problem is
By projecting the display image (56) outside scenery (8) to the projection member which transmits (21), the display image visibly by the virtual image displayed by the user, is that river distance from the user to the virtual image display position in the longitudinal direction In the host vehicle (2) on which the head-up display (50) is mounted, a vehicle display control device (54, 50e) for controlling the virtual image display,
Obstacle detection means (S102 to S105) for detecting a front obstacle (8a) in an outside scene,
When a front obstacle is detected by the obstacle detection means, the virtual image display state of the visual stimulus image (560, 560a, 560b, 1560c, 3560, 3560a, 3560b) is detected as a display image for stimulating the user's vision. Virtual image display control means (S101, S106 to S117, S1116, S1117, S1118, S1119, S2117) for controlling in association with the front obstacle of
The virtual image display control unit causes the virtual image display position of the visual stimulus image to jump at least to the front of the host vehicle from the near side to the front obstacle on the back side of the user, and reduces the virtual image display size of the visual stimulus image according to the jump. It is characterized by making it.

  According to such a vehicle display control device of the first invention, when a front obstacle is detected, the virtual image display state of the visual stimulus image that stimulates the user's vision is controlled in association with the detected front obstacle. The At this time, the virtual image display position of the visual stimulus image can jump to the front obstacle on the back side from the near side with respect to the user, thereby giving the user an apparent movement action. At the same time, the virtual image display size of the visual stimulus image can be reduced according to the jump of the virtual image display position, thereby giving an apparent perspective to the user. As a result of the synergistic effect of the apparent movement action and perspective, the user's line of sight is drawn from the near side to the far front obstacle, regardless of whether the front obstacle is present in the central visual field or the peripheral visual field of the user. Thus, the alerting effect can be enhanced. Moreover, according to the apparent motion action, even if the virtual image display of the visual stimulus image is repeated, the user can continue to give the user visual stimulus in the front-rear direction from the near side to the far side, so that a high alerting effect on the front obstacle Can be sustained. For these reasons, the first aspect of the invention makes it possible to ensure safety and security by continuously providing a high alerting effect to the user and assisting in early detection of a front obstacle.

The vehicle display unit as the second invention disclosed in order to solve the above-described problem is
A vehicle display control device (54, 50e) of the first invention;
HUD50 is provided.

  In such a second invention, the virtual image display state of the visual stimulus image is controlled in association with the front obstacle by the vehicle display control device of the first invention. Therefore, according to the same principle as the first invention, a high alerting effect for the front obstacle is continuously provided, and the safety and security of the user can be ensured.

It is an interior view which shows the vehicle interior of the own vehicle carrying the driving assistance system by a first embodiment. It is a block diagram which shows the driving assistance system by 1st embodiment. FIG. 3 is a structural diagram schematically showing a detailed configuration of the HUD of FIGS. It is a front view which shows the virtual image display state by HUD of FIGS. It is a front view which shows the virtual image display state by HUD of FIGS. It is a schematic diagram for demonstrating the transition of the virtual image display state by HUD of FIGS. It is a flowchart which shows the display control flow by HCU of FIG. It is a flowchart which shows the display control flow by HCU of 2nd embodiment. It is a schematic diagram for demonstrating the transition of the virtual image display state by HUD of 2nd embodiment. It is a front view which shows the virtual image display state by HUD of 3rd embodiment. It is a front view which shows the virtual image display state by HUD of 3rd embodiment. It is a front view which shows the virtual image display state by HUD of 4th embodiment. It is a front view which shows the virtual image display state by HUD of 4th embodiment. It is a schematic diagram which shows the modification of FIG. It is a schematic diagram which shows the modification of FIG. It is a schematic diagram which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a flowchart which shows the modification of FIG. It is a block diagram which shows the modification of FIG.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
A travel assist system 1 according to a first embodiment to which the present invention is applied is mounted on a host vehicle 2 as shown in FIGS.

  As shown in FIG. 2, the travel assist system 1 includes a periphery monitoring system 3, a vehicle control system 4, and an information presentation system 5. The systems 3, 4, and 5 of the travel assist system 1 are connected via an in-vehicle network 6 such as a LAN (Local Area Network).

  The periphery monitoring system 3 includes an external sensor 30 and a periphery monitoring ECU (Electronic Control Unit) 31. The outside sensor 30 detects obstacles that exist in the outside of the host vehicle 2 and may collide, such as other vehicles, artificial structures, humans and animals, and traffic indications in the outside. The external sensor 30 is, for example, one type or plural types of sonar, radar, camera, and the like.

  Specifically, the sonar is an ultrasonic sensor installed in, for example, a front part or a rear part of the host vehicle 2. The sonar detects the obstacle in the detection area by outputting the reflected wave of the ultrasonic wave transmitted to the detection area in the external environment of the host vehicle 2, and outputs a detection signal. The radar is a millimeter wave sensor or a laser sensor installed in the front part or the rear part of the host vehicle 2. The radar receives the millimeter wave or quasi-millimeter wave transmitted to the detection area in the external environment of the host vehicle 2, or the reflected wave of the laser, thereby detecting an obstacle in the detection area and outputting a detection signal. . The camera is a monocular or compound eye camera installed on, for example, a room mirror or a door mirror of the host vehicle 2. The camera captures a detection area in the external environment of the host vehicle 2 to detect an obstacle or traffic display in the detection area and outputs an image signal.

  The periphery monitoring ECU 31 is mainly configured by a microcomputer having a processor and a memory, and is connected to the external sensor 30 and the in-vehicle network 6. The periphery monitoring ECU 31 acquires sign information such as a speed limit sign and a lane sign, and lane marking information such as a white line and a yellow line based on an output signal of the external sensor 30. At the same time, the surroundings monitoring ECU 31, for example, the type of obstacle, the position of the front obstacle 8a (see FIGS. 1, 4 and 5), the moving direction and the moving speed, and the relative speed and relative speed of the front obstacle 8a relative to the host vehicle 2 Obstacle information such as distance is acquired based on the output signal of the external sensor 30.

  The vehicle control system 4 includes a vehicle state sensor 40, an occupant sensor 41, and a vehicle control ECU 42. The vehicle state sensor 40 is connected to the in-vehicle network 6. The vehicle state sensor 40 detects the traveling state of the host vehicle 2. The vehicle state sensor 40 is, for example, one type or a plurality of types among a vehicle speed sensor, a rotation speed sensor, a rudder angle sensor, a fuel sensor, a water temperature sensor, a radio wave receiver, and the like.

  Specifically, the vehicle speed sensor detects the vehicle speed of the host vehicle 2 and outputs a vehicle speed signal corresponding to the detection. The rotation speed sensor detects the engine rotation speed of the internal combustion engine in the host vehicle 2 and outputs a rotation speed signal corresponding to the detection. The steering angle sensor detects the steering angle of the host vehicle 2 and outputs a steering angle signal corresponding to the detection. The fuel sensor detects the remaining amount of fuel in the fuel tank of the host vehicle 2 and outputs a fuel signal corresponding to the detection. The water temperature sensor detects the cooling water temperature of the internal combustion engine in the host vehicle 2 and outputs a water temperature signal corresponding to the detection. The radio wave receiver outputs a traffic signal by receiving output radio waves from, for example, a positioning satellite, another vehicle transmitter for vehicle-to-vehicle communication, and a roadside device for road-to-vehicle communication. Here, the traffic signal is a signal representing traffic information related to the host vehicle 2 such as a travel position, a travel direction, a travel path state, a speed limit, and the like, and the obstacle information.

  The occupant sensor 41 is connected to the in-vehicle network 6. The occupant sensor 41 detects the state or operation of a user who has boarded in the passenger compartment 2c of the host vehicle 2 shown in FIG. The occupant sensor 41 is, for example, one type or a plurality of types among a power switch, a user status monitor, a display setting switch, a turn switch, and the like.

  Specifically, the power switch is turned on by the user to start the internal combustion engine or the motor generator of the host vehicle 2, and outputs a power signal corresponding to the operation. The user state monitor captures the user state on the driver's seat 20 in the passenger compartment 2c with an image sensor, thereby detecting the user state and outputting an image signal. The display setting switch is operated by the user to set the display state in the passenger compartment 2c, and outputs a display setting signal corresponding to the operation. The turn switch is turned on by the user in the passenger compartment 2c to operate the direction indicator of the host vehicle 2, and outputs a turn signal corresponding to the operation.

  The vehicle control ECU 42 shown in FIG. 2 is mainly composed of a microcomputer having a processor and a memory, and is connected to the in-vehicle network 6. The vehicle control ECU 42 is one type or a plurality of types including at least an integrated control ECU among an engine control ECU, a motor control ECU, a brake control ECU, a steering control ECU, an integrated control ECU, and the like.

  Specifically, the engine control ECU controls the operation of the throttle actuator and the fuel injection valve of the internal combustion engine in accordance with the operation of the accelerator pedal 26 in the passenger compartment 2c shown in FIG. Accelerate or decelerate the vehicle speed. The motor control ECU accelerates or decelerates the vehicle speed of the host vehicle 2 by controlling the operation of the motor generator according to the operation of the accelerator pedal 26 in the passenger compartment 2c or automatically. The brake control ECU accelerates or decelerates the vehicle speed of the host vehicle 2 by controlling the operation of the brake actuator according to the operation of the brake pedal 27 in the passenger compartment 2c or automatically. The steering control ECU adjusts the steering angle of the host vehicle 2 by controlling the operation of the electric power steering in accordance with the operation of the steering handle 24 in the passenger compartment 2c or automatically. The integrated control ECU synchronously controls the operation of the other control ECU based on, for example, the output signals of the sensors 40 and 41, the acquired information in the periphery monitoring ECU 31, and the control information in the other control ECU of the vehicle control ECU 42.

  As shown in FIGS. 1 and 2, the information presentation system 5 is a combination of an acoustic unit 5 s and a display unit 5 d. The acoustic unit 5s is mounted on the host vehicle 2 in order to present information in an auditory manner. The acoustic unit 5s is mainly composed of a speaker and a sound source circuit, and is connected to the in-vehicle network 6. The acoustic unit 5s is installed, for example, in one or a plurality of locations among the driver's seat 20, the instrument panel 22, and the door 25 in the passenger compartment 2c of the host vehicle 2 shown in FIG. A perceptible sound wave or sound is generated.

  As shown in FIGS. 1 and 2, the display unit 5 d is mounted on the host vehicle 2 in order to visually present information as a “vehicle display unit”. The display unit 5 d includes an HUD 50, an MFD (Multi Function Display) 51, a combination meter 52, and an HCU (HMI (Human Machine Interface) Control Unit) 54.

  The HUD 50 is installed on the instrument panel 22 in the passenger compartment 2c shown in FIGS. The HUD 50 passes a display image 56 formed so as to show predetermined information on a display 50 i such as a liquid crystal panel or a projector to the front windshield 21 as a “projection member” in the own vehicle 2 through the optical system 50 o. Project. Here, the front windshield 21 is formed of translucent glass, and thus transmits the outside scene 8 existing in front of the host vehicle 2 out of the passenger compartment 2c. At this time, the luminous flux of the display image 56 reflected by the front windshield 21 and the luminous flux from the external scene 8 transmitted through the shield 21 are perceived by the user on the driver seat 20. As a result, the virtual image of the display image 56 formed in front of the front windshield 21 is displayed so as to be superimposed on a part of the external scene 8, so that the virtual image of the display image 56 and the real image of the external scene 8 are displayed. Is visible to the user on the driver's seat 20. Here, in this embodiment especially when the front obstacle 8a is detected as described later, as the display image 56 for stimulating the user's vision on the driver's seat 20, the visual stimulus as shown in FIGS. The image 560 is displayed as a virtual image and is associated with the front obstacle 8a in the external scene 8.

  Specifically, the near side stimulus image 560a shown in FIGS. 1 and 4 of the visual stimulus image 560 is formed on the near side by being formed at a virtual image display position (see FIG. 3) separated forward from the driver's seat 20. A virtual image is displayed in a circular shape in the area Aa. Here, in particular, the virtual image display position of the near side stimulation image 560a is, for example, forward from the driver seat 20 on the reference straight line L connecting the driver seat 20 or its surroundings and the front obstacle 8a in the present embodiment. It is adjusted to a position separated by about 2 m. The virtual image display color tone of the near side stimulus image 560a is a translucent color that enables the portion of the external scene 8 where the image 560a is superimposed to be visible, and is adjusted to the color tone necessary to stimulate the user's vision Is done. Here, in particular, the virtual image display color tone of the near-side stimulus image 560a is adjusted to white that gives high virtual image display luminance according to the light intensity of the built-in light source of the display 50i in the present embodiment. The virtual image display size of the near side stimulus image 560a is adjusted to a size necessary to stimulate the user's vision. The virtual image display size of the near side stimulus image 560a means an apparent size visually recognized by the user on the driver's seat 20. In FIG. 5, the near side stimulation image 560a erased in the near side area Aa is virtually indicated by a two-dot chain line.

  On the other hand, the back side stimulus image 560b shown in FIG. 5 of the visual stimulus image 560 is formed at a virtual image display position (see FIG. 3) farther from the driver's seat 20 than the virtual image display position of the near side stimulus image 560a. As a result, a circular virtual image is displayed in the back area Ab. Here, in particular, the virtual image display position of the back side stimulation image 560b is, for example, forward from the driver's seat 20 on the reference straight line L connecting the driver's seat 20 or its surroundings and the front obstacle 8a in the present embodiment. It is adjusted to a position about 15 m apart. Therefore, the back side region Ab where the back side stimulus image 560b is displayed as a virtual image is set above the near side region Aa where the near side stimulus image 560a is displayed as a virtual image. The virtual image display color tone of the back side stimulation image 560b is a translucent color that enables the portion of the external scene 8 where the same image 560b is superimposed to be adjusted to a color tone necessary to stimulate the user's vision. Is done. Here, in particular, the virtual image display color tone of the back side stimulus image 560b is adjusted to white that gives a virtual image display brightness lower than that of the near side stimulus image 560a according to the light intensity of the built-in light source of the display 50i. The virtual image display size of the back side stimulus image 560b is adjusted to a size smaller than the near side stimulus image 560a as long as it becomes a size necessary for stimulating the user's vision. In addition, the virtual image display size of the back side stimulation image 560b means the apparent size visually recognized by the user on the driver's seat 20. That is, the user perceives the back side stimulation image 560b in a size smaller than the near side stimulation image 560a. Moreover, in FIG.1, 4, the back side stimulation image 560b erase | eliminated in the back side area | region Ab is virtually shown with the dashed-two dotted line.

  The virtual image display of the back side stimulation image 560b is executed after a predetermined erasing time Te after the near side stimulation image 560a is erased as shown in FIG. As a result, as the visual stimulus image 560, the virtual image display position jumps one step from the near side to the front obstacle 8a toward the user on the driver's seat 20, and the virtual image display size is reduced according to the jump. At this time, as the visual stimulus image 560, the virtual image display color tone is kept white before and after the jump from the near side stimulus image 560a to the back side stimulus image 560b, while the virtual image display luminance decreases according to the jump. Further, when the necessary display period that needs to be displayed as the visual stimulus image 560 becomes longer, the jump from the near side stimulus image 560a to the back side stimulus image 560b is repeated with a predetermined interval time Ti interposed therebetween.

  Note that the virtual image display by the HUD 50 includes not only the display of the visual stimulus image 560 but also the display of an image indicating one or more types of information among navigation information, sign information, obstacle information, and the like. Good. The navigation information can be acquired based on the map information stored in the memory 54m and the output signal of the sensor 40, for example, in the HCU 54 described in detail later. Furthermore, by using a light-transmitting combiner that is installed on the instrument panel 22 and transmits the external scenery 8 in cooperation with the front windshield 21, the display image 56 can be projected onto the combiner to display a virtual image display. Realization is possible.

  The MFD 51 is installed in the center console 23 in the passenger compartment 2c shown in FIG. The MFD 51 displays a real image of an image formed so as to show predetermined information on one or a plurality of liquid crystal panels so that it can be visually recognized by a user on the driver's seat 20. As the real image display by the MFD 51, display of an image indicating one type or a plurality of types of information among navigation information, audio information, video information, communication information, and the like is employed.

  The combination meter 52 is installed on the instrument panel 22 in the passenger compartment 2c. The combination meter 52 displays vehicle information related to the host vehicle 2 so that the user on the driver's seat 20 can visually recognize the vehicle information. The combination meter 52 is a digital meter that displays vehicle information by an image formed on a liquid crystal panel, or an analog meter that displays vehicle information by indicating a scale with a pointer. As the display by the combination meter 52, for example, a display indicating one type or a plurality of types of information among the vehicle speed, the engine speed, the remaining fuel amount, the coolant temperature, the operation state of the turn switch, and the like is employed.

  As shown in FIG. 2, the HCU 54 is mainly composed of a microcomputer having a processor 54p and a memory 54m, and is connected to the display elements 50, 51, 52 of the display unit 5d and the in-vehicle network 6. The HCU 54 synchronously controls the operations of the display elements 50, 51, and 52 of the acoustic unit 5s and the display unit 5d. At this time, the HCU 54 controls the operation of the sensors 40 and 41 based on, for example, output signals from the ECU 31, information acquired by the ECU 31, control information from the ECU 42, information stored in the memory 54m, and information acquired by the HCU 54 itself. . Note that the memory 54m of the HCU 54 and the memories of other various ECUs are respectively configured by using one or a plurality of storage media such as a semiconductor memory, a magnetic medium, or an optical medium.

  Here, particularly in this embodiment, the data of the display image 56 including the visual stimulus image 560 is stored in the memory 54m, so that the HCU 54 functions as a “vehicle display control device”. Specifically, the HCU 54 executes a display control program by the processor 54p, thereby realizing a display control flow for reading and displaying the visual stimulus image 560 from the memory 54m as shown in FIG. Note that the image storage means for storing the display image 56 is constructed by the memory 54m in this embodiment, but either by the memory of the built-in ECU of the display elements 50, 51, 52, or the memory and the memory 54m. May be constructed by jointly using a plurality of memories. The display control flow is started in response to an ON operation of the power switch as the occupant sensor 41 and is ended in response to an OFF operation of the switch. Furthermore, “S” in the display control flow means each step.

  In S101 of the display control flow, the count value C stored in the memory 54m is initialized to 0. In the next S102, the obstacle information related to the forward obstacle 8a is acquired. The obstacle information at this time is one type or a plurality of types of the obstacle information acquired by the periphery monitoring ECU 31 and the obstacle information represented by the output signal of the radio wave receiver that is the vehicle state sensor 40.

  In subsequent S103, based on the obstacle information acquired in S102, it is determined whether or not the forward obstacle 8a has been detected. As a result, when a negative determination is made, the process returns to S101, whereas when an affirmative determination is made, the process proceeds to S104.

  In S104, the collision probability based on the obstacle information acquired in S102 is calculated as the collision risk of the host vehicle 2 with respect to the forward obstacle 8a detected in S103. At this time, the collision probability is calculated, for example, according to a simulation executed on the display control program.

  In continuing S105, it is determined whether the collision probability calculated by S104 is more than a reference | standard probability. The reference probability at this time is set to, for example, the most probable probability among the collision probabilities that require attention from the viewpoint of ensuring the safety of the host vehicle 2. As a result of S105, when a negative determination is made, the process returns to S101. On the other hand, when an affirmative determination is made, it is determined that the front obstacle 8a having a high collision probability is detected, and the process proceeds to S106.

  In S106, it is determined whether or not the count value C stored in the memory 54m is 1 or more. As a result, if a negative determination is made, S107 is executed, and a sound wave or a sound that warns the presence of the front obstacle 8a is emitted by the acoustic unit 5s, and then the process proceeds to S108. On the other hand, if a positive determination is made, the process directly proceeds to S108.

  In subsequent S108, display environment information necessary to display the visual stimulus image 560 in a virtual image is acquired. The display environment information at this time is one type or a plurality of types among, for example, information acquired by the periphery monitoring ECU 31 and information based on output signals of the sensors 40 and 41. Specifically, obstacle information is exemplified as the acquisition information in the periphery monitoring ECU 31. Examples of the information based on the output signal of the vehicle state sensor 40 include vehicle speed represented by the output signal of the vehicle speed sensor, rudder angle represented by the output signal of the rudder angle sensor, and traffic information and obstacle information represented by the output signal of the radio receiver. Is done. Examples of information based on the occupant sensor 41 include a display state set value represented by an output signal of a display setting switch and a user state such as an eyeball state represented by an output signal of a user state monitor.

  In subsequent S109, the virtual image display state of the near side stimulus image 560a in the visual stimulus image 560 is controlled based on the display environment information acquired in S108. Specifically, first, a reference straight line L that connects between the driver's seat 20 or the surrounding area and the front obstacle 8a is set. Next, data defining the virtual image display size, virtual image display brightness, and virtual image display color tone of the near side stimulus image 560a is read from the memory 54m. Further, the virtual image display position of the read near side stimulus image 560a is adjusted to the reference straight line L. Thereby, the virtual image display state of the near side stimulus image 560a is controlled in association with the front obstacle 8a.

  In subsequent S110, it is determined whether or not a predetermined near side display time Ts (see FIG. 6) has elapsed since the start of execution of S109. The near side display time Ts at this time is set to a time necessary for stimulating the user's vision with the near side stimulus image 560a, for example, 30 milliseconds. As a result of S110, while a negative determination is made, the display control in S109 is continued and the same S110 is repeatedly executed. On the other hand, if an affirmative determination is made, the process proceeds to S111.

  In S111, after the virtual image display of the near side stimulation image 560a is erased, in subsequent S112, it is determined whether or not the erasing time Te (see FIG. 6) has elapsed since the end of the execution of S111. The erasure time at this time is set to a time during which the visual stimulus image 560 can give the apparent motion action to the user by jumping from the near side stimulus image 560a to the back side stimulus image 560b, for example, 60 milliseconds. As a result of S112, while the negative determination is made, the erasure control at S111 is continued and the same S112 is repeatedly executed. When the positive determination is made, the process proceeds to S113.

  In S113, the virtual image display state of the back side stimulus image 560b in the visual stimulus image 560 is controlled based on the display environment information acquired in S108. Specifically, first, data defining the virtual image display size, the virtual image display brightness, and the virtual image display color tone of the back side stimulus image 560b is read from the memory 54m. Next, the virtual image display position of the read back side stimulus image 560b is adjusted to the reference straight line L set in the latest S109. Thereby, the virtual image display state of the back side stimulus image 560b is controlled in association with the front obstacle 8a.

  In subsequent S114, it is determined whether or not a predetermined back side display time Tb (see FIG. 6) has elapsed since the start of execution of S113. The back side display time Tb at this time is set to a time required for stimulating the user's vision with the back side stimulation image 560b, for example, 30 milliseconds. As a result of S114, while a negative determination is made, the display control in S113 is continued and the same S114 is repeatedly executed. On the other hand, if an affirmative determination is made, the process proceeds to S115.

  In S115, the virtual image display of the back side stimulation image 560b is deleted, and then in S116, the count value C stored in the memory 54m is incremented. Further, in S117, after a certain delay time Td is secured, the process returns to S104. As a result, the period after S105 in which an affirmative determination is made until the negative determination is made in the subsequent S105 becomes the necessary display period. In addition, during the necessary display period, S105 of affirmative determination is further repeated after S105 of affirmative determination, so that a predetermined time interval Ti corresponding to the delay time Td is sandwiched from the near side stimulation image 560a to the back side stimulation image. The jump to 560b is repeated. In addition, when a negative determination is made in the subsequent S105 after the positive determination S105, only when the collision probability with the forward obstacle 8a existing continuously after the detection is reduced to less than the reference probability. In addition, a case where the once detected forward obstacle 8a is not detected and the collision probability becomes substantially zero is also included.

  In addition, the part which performs S102-S105 among HCU54 in such 1st embodiment is corresponded to the "obstacle detection means" constructed | assembled by the processor 54p. The portion of the HCU 54 that executes S101 and S106 to S117 corresponds to “virtual image display control means” constructed by the processor 54p.

(Function and effect)
The operational effects of the first embodiment described so far will be described below.

  According to the HCU 54 of the first embodiment, the virtual image display state of the visual stimulus image 560 that stimulates the user's vision when the forward obstacle 8a is detected is controlled in association with the detected forward obstacle 8a. At this time, the virtual image display position of the visual stimulus image 560 can give the user an apparent movement action by jumping from the near side to the front side toward the front obstacle 8a. At the same time, the virtual image display size of the visual stimulus image 560 can be reduced according to the jump of the virtual image display position, thereby giving an apparent perspective to the user. As a result of the synergistic effect of the apparent movement action and the perspective, even if the front obstacle 8a is present in either the central visual field or the peripheral visual field of the user, the user's line of sight is shifted from the near side to the far front obstacle 8a. You can increase the alerting effect. In addition, according to the apparent motion action, even if the virtual image display of the visual stimulus image 560 is repeated, the visual stimulus in the front-rear direction from the near side to the far side can be continuously given to the user, so high attention to the front obstacle 8a. The arousal effect can be sustained. For these reasons, the first embodiment enables the user to ensure safety and security by continuously providing a high alerting effect to assist the early detection of the forward obstacle 8a.

  Further, as in the first embodiment, after the near side stimulus image 560a which is the visual stimulus image 560 before the jump is deleted, the back side stimulus image 560b which is the visual stimulus image 560 after the jump is displayed as a virtual image. The apparent movement action can be surely given to the user. According to this, it is possible to maintain a high alerting effect as a realization of the attraction to the front obstacle 8a and the visual stimulation in the front-rear direction. Therefore, it is possible to improve reliability with respect to the effect of ensuring safety and security for the user.

  Furthermore, according to the first embodiment, the virtual image display position decreases according to the jump of the visual stimulus image 560 from the near side to the far side, and the virtual image display brightness of the image 560 is reduced. . According to the sense of perspective emphasized in this way, it is easy to attract the line of sight to the front obstacle 8a even in the peripheral visual field of the user, so that a high alerting effect can be brought about quickly. Therefore, it is possible to improve reliability with respect to the effect of ensuring safety and security for the user.

  In addition, the virtual image display color tone of the visual stimulus image 560 before and after the jump according to the first embodiment is maintained at white with the widest color field of view, so that the apparent motion effect and perspective can be surely given to the user. According to this, it is possible to maintain a high alerting effect as a realization of the attraction to the front obstacle 8a and the visual stimulation in the front-rear direction. Therefore, it is possible to improve reliability with respect to the effect of ensuring safety and security for the user.

  In addition, when the front obstacle 8a is detected in the first embodiment, if the jump of the visual stimulus image 560 that causes the virtual image display position to be directed from the near side to the far side is repeated, the user is temporarily presented. Motor effects and perspective can be given repeatedly. According to this, it is possible to suppress a situation in which the front obstacle 8a is overlooked by the user due to repetition of such a jump even though a single jump has a high alerting effect. Therefore, it is possible to improve reliability with respect to the effect of ensuring safety and security for the user.

(Second embodiment)
As shown in FIGS. 8 and 9, the second embodiment of the present invention is a modification of the first embodiment. In the display control flow of the second embodiment shown in FIG. 8, S2117 is executed instead of S117 of the first embodiment. In S2117, as the collision probability calculated and determined in the latest S104 and S105 as the collision risk of the host vehicle 2 with respect to the forward obstacle 8a increases, the shorter delay time Tds is secured, and the process returns to S104 again. As a result, during the necessary display period, S105 of affirmative determination is repeated after S105 of affirmative determination, so that a variable interval time Tis corresponding to the delay time Tds is sandwiched from the near side stimulation image 560a as shown in FIG. The jump to the side stimulus image 560b is repeated. That is, according to the delay time Tds secured for each jump of the visual stimulus image 560, the jump is repeated so as to sandwich the interval time Tis set shorter as the collision probability increases.

  In the second embodiment, the portion of the HCU 54 that executes S104 and S105 corresponds to “risk determination means” constructed by the processor 54p. Further, the portion of the HCU 54 that executes S2117 corresponds to “interval setting means” constructed by the processor 54p. Furthermore, the part which performs S101, S106-S116, S2117 among HCU54 is corresponded to the "virtual image display control means" constructed | assembled by the processor 54p.

  According to the second embodiment described above, the jump of the visual stimulus image 560 that moves the virtual image display position from the near side to the far side is the interval time Tis set for each jump when the forward obstacle 8a is detected. Repeated across. Here, if the interval time Tis is set to be shorter as the collision risk with respect to the forward obstacle 8a increases, the user can intuitively grasp the increase in the collision risk that appears as the jump frequency of the visual stimulus image 560. Can be made. Therefore, it is possible to contribute to ensuring safety and security for the user.

(Third embodiment)
As shown in FIGS. 10 and 11, the third embodiment of the present invention is a modification of the first embodiment. As the visual stimulus image 3560 of the third embodiment, a virtual image display color tone of the near side stimulus image 3560a shown with dot hatching in FIG. 10 is a chromatic color such as red that becomes high-eye with respect to at least one of saturation and brightness. Adjusted. Further, the virtual image display brightness of the near side stimulus image 3560a is adjusted to a high brightness in accordance with such color tone adjustment or in addition to the brightness of the built-in light source of the display 50i.

  On the other hand, as the visual stimulus image 3560, the virtual image display color tone of the back side stimulus image 3560b shown in FIG. 11 with dot hatching finer than that in FIG. 10 is from the near side stimulus image 3560a with respect to at least one of saturation and lightness. Is also adjusted to a chromatic color such as red, which is low. Further, the virtual image display brightness of the back side stimulation image 3560b is lower than that of the near side stimulation image 3560a according to such color tone adjustment or according to the luminous intensity of the built-in light source of the display 50i.

  The points on the near side stimulation image 3560a and the back side stimulation image 3560b other than those described above are substantially the same as those in the first embodiment. Thereby, as the visual stimulus image 3560, the virtual image display color tone is lowered with respect to at least one of the saturation and the lightness in accordance with the jump from the near side stimulus image 3560a to the back side stimulus image 3560b, so that the virtual image display luminance is also lowered. Because of this, the display control flow of the third embodiment is realized by replacing the images 560, 560a, and 560b of the first embodiment with images 3560, 3560a, and 3560b, respectively.

  According to the above third embodiment, the virtual image display position of the image 3560 is lowered with respect to at least one of saturation and brightness according to the jump of the visual stimulus image 3560 whose virtual image display position is directed from the near side to the far side. The sense of perspective can be emphasized. According to the sense of perspective emphasized in this way, it is easy to attract the line of sight to the front obstacle 8a even in the peripheral visual field of the user, so that a high alerting effect can be brought about quickly. Therefore, it is possible to improve reliability with respect to the effect of ensuring safety and security for the user.

(Fourth embodiment)
As shown in FIGS. 12 and 13, the fourth embodiment of the present invention is a modification of the third embodiment. In the fourth embodiment, in each of the visual stimulus images 3560 before and after the jump from the near side to the far side, the virtual image display of the image 3560 increases as the collision probability increases as the collision risk of the vehicle 2 against the front obstacle 8a. The size is adjusted to a large size.

  Specifically, the virtual image display size of the near side stimulus image 3560a which is the visual stimulus image 3560 before the jump is higher than the case of FIG. 12A in which the collision probability is the low probability Rl. In the case of FIG. 12B where the probability is Rh, it becomes larger. Further, the virtual image display size of the back side stimulus image 3560b, which is the visual stimulus image 3560 after the jump, is higher than the case of FIG. 13A in which the collision probability is the low probability Rl, and the high probability Rh. In the case of FIG.

  Here, the virtual image display size of the back side stimulation image 3560b is reduced more than the virtual image display size of the near side stimulation image 3560a between the same low probabilities Rl shown in the respective partial diagrams (a) of FIGS. Similarly, the virtual image display size of the back side stimulation image 3560b is reduced more than the virtual image display size of the near side stimulation image 3560a even between the same high probabilities Rh shown in the respective partial diagrams (b) of FIGS.

  Of course, as long as the image is reduced after the jump rather than before the jump, the change according to the collision probability of the virtual image display size may be other than the two-stage change shown in FIGS. That is, the change according to the collision probability of the virtual image display size may be, for example, a change in a plurality of stages that are two or more stages, a continuous change following the collision probability, or the like.

  Furthermore, in the fourth embodiment, in each of the visual stimulus images 3560 before and after the jump from the near side to the far side, a virtual image of the image 3560 so that at least one of saturation and brightness increases as the collision probability increases. The display color is adjusted. Further, the virtual image display brightness of the visual stimulus image 3560 before and after the jump is adjusted to be higher as the collision probability increases in accordance with the color tone adjustment or in addition to the luminous intensity of the built-in light source of the display 50i. Is done.

  Specifically, for the near side stimulus image 3560a, which is the visual stimulus image 3560 before the jump, the probability increases to a high probability Rh compared to the case of FIG. In the case of FIG. 12B, the saturation and / or brightness increases with the virtual image display brightness. Therefore, in FIG. 12, such a change in the virtual image display color tone and the virtual image display luminance is represented by adding rough dot hatching to the near side stimulation image 3560 a in the partial diagram (b) than in the partial diagram (a). Further, regarding the virtual image display color tone of the back side stimulus image 3560b which is the visual stimulus image 3560 after the jump, the probability is higher and the probability is higher than in the case of FIG. 13A in which the collision probability is the low probability Rl. In the case of FIG. 13B in which Rh is obtained, the saturation and / or brightness increases with the virtual image display luminance. Therefore, in FIG. 13, the change in the virtual image display color tone and the virtual image display luminance is represented by adding rough dot hatching to the back side stimulus image 3560 b in the partial diagram (b) than in the partial diagram (a).

  Here, in the same low probability R1 shown in each partial diagram (a) of FIGS. 12 and 13, the virtual image of the back side stimulation image 3560b with respect to at least one of saturation and lightness rather than the virtual image display color tone of the near side stimulation image 3560a. The display color is reduced. Thereby, in low probability Rl, the virtual image display brightness | luminance of the back side stimulus image 3560b falls compared with the virtual image display brightness | luminance of the near side stimulus image 3560a. Accordingly, in FIGS. 12 and 13, dot hatching finer than the near side stimulation image 3560 a of FIG. 12A is applied to the back side stimulation image 3560 b of FIG. Represents changes.

  Similarly, in the same high probability Rh shown in each of the partial diagrams (b) of FIGS. 12 and 13, the at least one of the saturation and the lightness of the back side stimulation image 3560b with respect to the virtual image display color tone of the near side stimulation image 3560a. Virtual image display color tone decreases. As a result, the virtual image display brightness of the back side stimulus image 3560b is lower than the virtual image display brightness of the near side stimulus image 3560a even between the high probabilities Rh. Accordingly, in FIGS. 12 and 13, such a virtual image display color tone and virtual image display luminance are obtained by applying dot hatching finer than the near side stimulation image 3560 a of FIG. 12B to the back side stimulation image 3560 b of FIG. Represents changes.

  It should be noted that the change according to the collision probability of the virtual image display color tone and the virtual image display brightness may be other than the two-stage change shown in FIGS. . That is, the change in accordance with the collision probability of the virtual image display color tone and the virtual image display color tone may be, for example, a change in a plurality of stages having two or more stages, a continuous change following the collision probability, or the like.

  Further, in the display control flow of the fourth embodiment, the virtual image display state of the stimulus images 3560a and 3560b is calculated and calculated by the latest S104 and S105 as the collision risk of the host vehicle 2 against the front obstacle 8a in S109 and S113, respectively. Adjust according to the determined collision probability. Therefore, in the fourth embodiment, the portion of the HCU 54 that executes S104 and S105 corresponds to “risk determination means” constructed by the processor 54p.

  Also in the fourth embodiment described above, as the visual stimulus image 3560 according to the third embodiment, the near side stimulus image 3560a before the jump and the back side stimulus image 3560b after the jump are displayed as virtual images. At this time, according to the fourth embodiment, the virtual image display size of the near side stimulus image 3560a and the virtual image display size of the back side stimulus image 3560b to be reduced are larger as the collision risk with respect to the front obstacle 8a increases. Adjusted. Therefore, the large-sized visual stimulus image 560 is displayed in a virtual image in association with the front obstacle 8a that exhibits a high alerting effect due to the synergistic effect of the apparent motion action and perspective. The user can intuitively grasp it. Therefore, it is possible to contribute to ensuring safety and security for the user.

  Furthermore, also in the fourth embodiment according to the third embodiment, the virtual image display color tone of the back side stimulus image 3560b is lower with respect to at least one of saturation and brightness than the virtual image display color tone of the near side stimulus image 3560a. In the fourth embodiment in which such color tone deterioration occurs, both the virtual image display color tone of the near side stimulus image 3560a and the virtual image display color tone of the back side stimulus image 3560b increase the saturation and brightness as the collision risk with respect to the front obstacle increases. Highly adjusted for at least one of the above. Therefore, the high-saturation and / or high-lightness visual stimulus image 3560 is displayed in a virtual image in association with the front obstacle 8a that exhibits a high alerting effect due to the synergistic effect of apparent motion and perspective. The user can intuitively grasp the risk increase. Therefore, it is possible to further contribute to ensuring safety and security for the user.

  In addition, according to the fourth embodiment, the virtual image display brightness of the near side stimulus image 3560a and the virtual image display brightness of the back side stimulus image 3560b that is lower than that are adjusted to be higher as the collision risk with respect to the front obstacle 8a increases. The Therefore, the high-intensity visual stimulus image 3560 is displayed in a virtual image in association with the front obstacle 8a that exhibits a high alerting effect due to the synergistic effect of the apparent movement action and the perspective. The user can intuitively grasp it. Therefore, it is possible to greatly contribute to ensuring safety and security for the user.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the scope of the present invention. Can be applied.

  Specifically, in the first modified example related to the first to fourth embodiments, as shown in FIG. 14 (modified example 1 of the first embodiment), the back side stimulation images 560a and 3560a are simultaneously deleted and The side stimulation images 560b and 3560b may be displayed as virtual images. In the second modification regarding the first to fourth embodiments, the virtual image display of the back side stimulation image 560b may be started immediately before the near side stimulation images 560a and 3560a are completely erased.

  In the third modification related to the first to fourth embodiments, the virtual image display brightness of the near side stimulus images 560a and 3560a before the jump and the virtual image display brightness of the back side stimulus images 560b and 3560b after the jump are kept constant. May be. In the fourth modification related to the first to fourth embodiments, the virtual image display brightness of the back side stimulation images 560b and 3560b after the jump is set to be higher than the virtual image display brightness of the near side stimulation images 560a and 3560a before the jump. May be. That is, as a fourth modification, the virtual image display brightness of the visual stimulus images 560 and 3560 may be increased according to the jump.

  In the fifth modification related to the third and fourth embodiments, the virtual image display color tone of the near side stimulus image 3560a before the jump and the virtual image display color tone of the back side stimulus image 3560b after the jump may be held constant. In the sixth modification related to the third and fourth embodiments, the virtual image display color tone of the back side stimulation image 3560b after the jump is set to a higher saturation and / or lightness than the virtual image display color tone of the near side stimulation image 3560a before the jump. May be. That is, as a sixth modification, the virtual image display color tone of the visual stimulus images 560 and 3560 may be increased according to the jump with respect to at least one of saturation and lightness.

  In the modified example 7 regarding the first and second embodiments, according to the fourth embodiment, the visual stimulation image 560 increases in size as the collision probability increases before and after the jump from the near side to the far side. The virtual image display size of the image 560 may be adjusted. In the modified example 8 related to the first to fourth embodiments, the visual stimulus images 560 and 3560 are smaller in size as the collision probability increases before and after the jump from the near side to the far side. The virtual image display size may be adjusted.

  In the modified example 9 related to the fourth embodiment, the virtual image display size of the image 3560 is changed depending on the collision probability before and after the jump of the visual stimulus image 3560 from the near side to the far side, according to the first embodiment. It is not necessary to change. In the tenth modification related to the fourth embodiment, the virtual image display color tone of the image 3560 is changed depending on the collision probability before and after the jump of the visual stimulus image 3560 from the near side to the far side, according to the first embodiment. It is not necessary to change. In the modification 11 regarding the fourth embodiment, according to the first embodiment, the virtual image display brightness of the image 3560 before and after the jump from the near side to the far side depends on the collision probability, according to the first embodiment. It is not necessary to change.

  In the modified example 12 related to the fourth embodiment, in each of the visual stimulus images 3560 before and after the jump from the near side to the far side, at least one of the saturation and the brightness decreases as the collision probability increases. The virtual image display color tone of the image 3560 may be adjusted. In the thirteenth modification related to the fourth embodiment, the virtual image display color tone of the image 3560 is such that the visual stimulus image 3560 has a lower luminance as the collision probability increases before and after the jump from the near side to the far side. May be adjusted.

  In the modified example 14 related to the first to fourth embodiments, the virtual image display position where the near side stimulus images 560a and 3560a and the back side stimulus images 560b and 3560b are formed is on the gaze line from the user toward the front obstacle 8a. You may adjust. In the modification 15 regarding the first to fourth embodiments, as shown in FIG. 15 (the modification is the modification 15 of the first embodiment), the near side stimulation images 560a and 3560a and the back side stimulation images 560b and 3560b are You may display a virtual image with shapes other than circular. FIG. 15 shows Modification 15 in the case where the near side stimulus image 560a and the back side stimulus image 560b are displayed as virtual images in a triangular shape. In FIG. 15, one vertex of the triangular shape of the near side stimulation image 560a and the back side stimulation image 560b indicates the direction in which the front obstacle 8a exists.

  In Modification 16 regarding the first to fourth embodiments, in addition to the near side stimulation images 560a and 3560a and the back side stimulation images 560b and 3560b, as shown in FIG. 16 (the modification is Modification Example 16 of the first embodiment). Thus, at least one intermediate stimulus image 1560c may be displayed as a virtual image as the visual stimulus images 560 and 3560. Here, in the modified example 16, at least one intermediate stimulus image 1560c is displayed and then erased between the erasure of the near side stimulus images 560a and 3560a and the virtual image display of the back side stimulus images 560b and 3560b. . At this time, the reference straight line is set so that the virtual image display position of at least one intermediate stimulus image 1560c is on the back side of the near side stimulus images 560a and 3560a and on the near side of the back side stimulus images 560b and 3560b. It is adjusted by L etc. At the same time, the virtual image display size of at least one intermediate stimulus image 1560c is adjusted to be smaller than the near side stimulus images 560a and 3560a and larger than the back side stimulus images 560b and 3560b. Therefore, in the modified example 16 as described above, the visual stimulus images 560 and 3560 achieve a jump in two or more steps from the near side to the forward obstacle 8a by adjusting the virtual image display position and the virtual image display size. Will do.

  In such a modification example 16, the virtual image display color tone of the intermediate stimulus image 1560c before and after the jump is kept white according to the first embodiment, or is changed according to any of the third and fourth embodiments. May be adopted. In the modification 16, the virtual image display brightness of the intermediate stimulus image 1560c before and after the jump may be changed according to any of the first, third, and fourth embodiments.

  In the modified example 17 related to the first and second embodiments, instead of executing S116, S117, and S2117, S1116 and S1117 shown in FIG. 17 (modified example 17 of the first embodiment) are sequentially executed. The display control flow may be changed. Specifically, in S1116, obstacle information related to the forward obstacle 8a is acquired in the same manner as in S102. In S1117, it is determined based on the obstacle information acquired in S1116 whether or not the front obstacle 8a is detected separately from the detection target in S103. As a result, while a negative determination is made, S1117 is repeatedly executed, whereas when an affirmative determination is made, the process proceeds to S104.

  In the modified example 17, the jump from the near side stimulus image 560a to the back side stimulus image 560b is realized only once for the same front obstacle 8a. Moreover, in S104 which transfers from S1117 of the modification 17, a collision probability is calculated with respect to another forward obstacle 8a detected by the S1117. Further, in Modification 17, since S101 and S106 are not required, when an affirmative determination is made in S105, the process proceeds to S108 after executing S107 as shown in FIG. In the modified example 17 described above, the portion of the HCU 54 that executes S101, S106 to S115, S1116, and S1117 corresponds to “virtual image display control means” constructed by the processor 54p.

  In the modification 18 regarding the first embodiment, the display control flow may be changed so as to return from S117 to S103 as shown in FIG. 18 without executing S104 and S105. Here, in the modified example 18, after S103 in which an affirmative determination is made, a period until a negative determination is made in the subsequent S103 is a necessary display period. Further, during the necessary display period, the affirmative determination S103 is further repeated after the affirmative determination S103, so that the front side stimulation image 560a is shifted to the back side stimulation image 560b with the interval time Ti corresponding to the delay time Td. The jump is repeated. In the above-described modification 18, the part of the HCU 54 that executes S102 and S103 corresponds to “obstacle detection means” constructed by the processor 54p.

  In the modified example 19 related to the second embodiment, instead of executing S2117 as shown in FIG. 19, after executing S1118 that secures a longer delay time Tdl as the collision probability calculated and determined by the latest S104 and S105 increases, The display control flow may be changed so as to return to S104. In the modification 19, the part of the HCU 54 that executes S101, S106 to S116, and S1118 corresponds to “virtual image display control means” constructed by the processor 54p. In Modification 20 regarding the third and fourth embodiments, S2117 according to the second embodiment may be executed instead of S117.

  In the modified example 21 related to the first to fourth embodiments, the display control flow is changed so that S1119 shown in FIG. 20 (modified example 21 of the first embodiment) is executed following S117 and S2117. May be. Specifically, in S1119, it is determined whether or not the count value C stored in the memory 54m is a reference value of 2 or more. As a result, when a negative determination is made, the process returns to S106, whereas when an affirmative determination is made, the process returns to S101. Therefore, in the modification 21, the jump from the near side stimulation image 560a to the back side stimulation image 560b is repeated a predetermined number of times according to the reference value. In the first, third, and fourth embodiments as the above-described modification example 21, the portion that executes S101, S106 to S117, and S1119 of the HCU 54 is constructed by the processor 54p "virtual image display control means" It corresponds to. In the second embodiment as the modified example 21, the part of the HCU 54 that executes S101, S106 to S116, S2117, and S1119 corresponds to “virtual image display control means” constructed by the processor 54p.

  In the modification 22 regarding the first to fourth embodiments, the display control flow may be changed so that S101, S106, S107, and S116 are not executed. In the modified example 23 regarding the first to fourth embodiments, in addition to or instead of the notification sound wave or the notification sound, the display control flow is executed so as to execute S107 that warns the presence of the front obstacle 8a by applying vibration to the user. May be changed.

  In the modification 24 regarding the first to fourth embodiments, the HCU 54 may not be provided as shown in FIG. 21 (the modification is the modification 24 of the first embodiment). Here, in the modified example 24, for example, one or more of the ECUs 31 and 42 and the display ECU provided for controlling the display elements 50, 51 and 52 may function as a “vehicle display control device”. Good. That is, the “virtual image display control means” may be constructed by realizing the display control flow of each embodiment by a processor included in one or more types of ECUs. 21 shows a case where the display ECU 50e having the processor 54p and the memory 54m in the HUD 50 fulfills the function of “vehicle display control device”.

2 Self-vehicle, 8 Outside scene, 8a Front obstacle, 21 Front windshield, 50 HUD, 50e ECU, 54 HCU, 54m Memory, 54p Processor, 56 Display image, 560, 3560 Visual stimulus image, 560a, 3560a Front side stimulus Image, 560b, 3560b Back side stimulus image, 1560c Intermediate stimulus image, Rh high probability, Rl low probability, Ti, Tis interval time

Claims (12)

The display image (56) is projected onto the projection member (21) that passes through the outside scenery (8), and the display image is displayed as a virtual image so that the user can see it. The distance from the user to the virtual image display position in the front-rear direction is in River that the mounted vehicle head up display (50) (2), a vehicle display controller for controlling the virtual image display (54,50E)
Obstacle detection means (S102 to S105) for detecting a front obstacle (8a) in the outside landscape;
When the front obstacle is detected by the obstacle detection means, a virtual image display state of a visual stimulus image (560, 560a, 560b, 1560c, 3560, 3560a, 3560b) as the display image for stimulating the user's vision Virtual image display control means (S101, S106 to S117, S1116, S1117, S1118, S1119, S2117) for controlling the image in association with the front obstacle of the detection,
The virtual image display control means, at least the said virtual image display position of the visual stimuli image toward the front side to the front obstacle on the rear side relative to the user causes a jump to the front of the vehicle, the visual stimulus in accordance with the jump A display control apparatus for a vehicle, which reduces a virtual image display size of an image. The virtual image display control means follows the jump of the virtual image display position, sets the imaging size of the visual stimulus image at the virtual image display position after the jump , and forms the visual stimulus image at the virtual image display position before the jump. The vehicular display control apparatus according to claim 1, wherein an apparent virtual image display size visually recognized by the user is reduced while being larger than the size . The virtual image display control means, from said by erasing the visual stimulation image before jumping, the vehicle display control according to the visual stimulation image after the jump to claim 1 or 2, characterized in that for the virtual image display apparatus. A risk judging means (S104, S105) for judging a collision risk of the own vehicle against the front obstacle detected by the obstacle detecting means,
The virtual image display control means adjusts the virtual image display size before the jump to a larger size as the collision risk determined by the risk determination means increases,
The virtual image display control means adjusts the virtual image display size to be reduced after the jump than before the jump to a larger size as the collision risk determined by the risk determination means increases. The display control apparatus for vehicles as described in any one of Claims 1-3. The virtual image display control means, the vehicle display control device according to any one of claims 1 to 4, wherein reducing the virtual image display brightness of the visual stimulation image in accordance with the jump. A risk judging means (S104, S105) for judging a collision risk of the own vehicle against the front obstacle detected by the obstacle detecting means,
The virtual image display control means adjusts the virtual image display brightness before the jump to a higher brightness as the collision risk determined by the risk determination means increases,
The virtual image display control means adjusts the virtual image display brightness that is lowered after the jump as compared with before the jump to a higher brightness as the collision risk determined by the risk determination means increases. The vehicle display control apparatus according to claim 5 . The virtual image display control means holds the virtual image display color tone of the visual stimulus image (560, 560a, 560b, 1560c) in white before and after the jump, according to any one of claims 1 to 6. The display control apparatus for vehicles as described. The virtual image display control means, a virtual image display color of the visual stimulus image in accordance with the jump (3560,3560a, 3560b), claim 1-6, characterized in that lowering with respect to at least one of the saturation and lightness The vehicle display control device according to one item. A risk judging means (S104, S105) for judging a collision risk of the own vehicle against the front obstacle detected by the obstacle detecting means,
The virtual image display control means adjusts the virtual image display color tone before the jump higher with respect to at least one of saturation and lightness as the collision risk determined by the risk determination means increases.
The virtual image display control means increases the virtual image display color tone to be reduced with respect to at least one of saturation and lightness after the jump than before the jump as the collision risk determined by the risk determination means increases. The vehicle display control device according to claim 8 , wherein a high adjustment is made with respect to one side. The virtual image display control means (S101, S106 to S117, S1118, S1119, S2117) repeats the jump when the obstacle detection means detects the front obstacle. vehicle display control device according to any one of 9. Risk determination means (S104, S105) for determining a collision risk of the own vehicle against the forward obstacle detected by the obstacle detection means;
Interval setting means (S2117) for setting a shorter interval time (Tis) as the collision risk determined by the risk determination means increases,
The virtual image display control means repeats the jump across the interval time set for each jump by the interval setting means when the front obstacle is detected by the obstacle detection means. The vehicle display control device according to claim 10 . The vehicle display control device (54, 50e) according to any one of claims 1 to 11 ,
A vehicle display unit comprising the head-up display (50).

Images