On-vehicle display system and control method of on-vehicle display system

Abstract

To provide an on-vehicle display system which can properly display to a user the presence of a further preceding vehicle recognized by the system in addition to an inter-vehicle distance between an own vehicle and a preceding vehicle.SOLUTION: An on-vehicle display system is mounted on an own vehicle and displays circumstances around the own vehicle on a display in a cabin. The on-vehicle display system includes a display control part which displays, when a preceding vehicle traveling ahead of the own vehicle is detected, a preceding vehicle icon on a traveling lane area of the display. The travel lane area has: a front-side display area; a first display area that is positioned at a deep side of the front-side display area; and a second display area that is positioned at a deep side of the first display area. The display control part displays, when a further preceding vehicle traveling ahead of the preceding vehicle is detected, a further preceding vehicle icon on the second display area and moves, when the preceding vehicle departs from a traveling lane of the own vehicle while the further preceding vehicle is detected, the further preceding vehicle icon from the second display area to the first display area.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an in-vehicle display system and a control method for an in-vehicle display system. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2023-117717 is a known technical document related to an in-vehicle display system. This publication describes a vehicle control device that indicates the status of the device's recognition of other vehicles by displaying a leading vehicle icon at a fixed position on a display inside the vehicle cabin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-117717 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, since the display area of ​​a display is limited, it is known that a preceding vehicle icon is displayed within a predetermined range on the display. When controlling the vehicle, such as adjusting the vehicle speed, based on the distance between the vehicle and the preceding vehicle, a target inter-vehicle distance is set as a control target. There is a demand for an intuitively understandable display of this target inter-vehicle distance using a preceding vehicle icon on the display, rather than a numerical value. [Means for solving the problem]

[0005] One aspect of the present invention is an in-vehicle display system that is mounted on a vehicle and displays the situation around the vehicle on a display inside the vehicle cabin. The system includes a display control unit that displays a preceding vehicle icon in the driving lane area of ​​the display when a preceding vehicle traveling ahead of the vehicle is detected. The driving lane area has a near display area, a first display area located behind the near display area, and a second display area located behind the first display area. If the inter-vehicle distance between the vehicle and the preceding vehicle is less than a first distance threshold, the display control unit displays the preceding vehicle icon in the near display area according to the inter-vehicle distance, and moves the preceding vehicle icon so that the longer the inter-vehicle distance, the closer the preceding vehicle icon is to the first display area behind the near display area. If the inter-vehicle distance is equal to or greater than the first distance threshold, the display control unit displays the preceding vehicle icon in the first display area. If a second-ahead vehicle traveling ahead of the preceding vehicle is detected, the display control unit displays the second-ahead vehicle icon in the second display area. If the second-ahead vehicle icon leaves the vehicle's driving lane while the second-ahead vehicle is detected, the display control unit moves the second-ahead vehicle icon from the second display area to the first display area.

[0006] When the inter-vehicle distance between the host vehicle and the preceding vehicle is less than a first distance threshold, the display control unit may change the lateral position of the preceding vehicle icon in the driving lane area depending on the lateral position of the preceding vehicle relative to the host vehicle or the driving lane.

[0007] When the preceding vehicle changes lanes from the driving lane to an adjacent lane, if the distance between the preceding vehicle and the subject vehicle at the time of the lane change is less than a second distance threshold that is shorter than the first distance threshold, the display control unit displays a preceding vehicle icon on the adjacent lane area adjacent to the driving lane area, and if the distance between the preceding vehicle and the subject vehicle at the time of the lane change is the second distance or more, it may not be necessary to display the preceding vehicle icon after the lane change.

[0008] Another aspect of the present invention is a control method for an in-vehicle display system that is mounted on a vehicle and displays the situation around the vehicle on a display inside the vehicle cabin, and when a preceding vehicle traveling ahead of the vehicle is detected, a preceding vehicle icon is displayed in the driving lane area of ​​the display, and the driving lane area has a near display area, a first display area located behind the near display area, and a second display area located behind the first display area, and when the inter-vehicle distance between the vehicle and the preceding vehicle is less than a first distance threshold, the preceding vehicle icon is displayed in the near display area according to the inter-vehicle distance, and the preceding vehicle icon is moved so that the longer the inter-vehicle distance, the closer the preceding vehicle icon is to the first display area behind the near display area, and when the inter-vehicle distance is equal to or greater than the first distance threshold, the preceding vehicle icon is displayed in the first display area, and when a second-ahead vehicle traveling ahead of the preceding vehicle is detected, the second-ahead vehicle icon is displayed in the second display area, and if the preceding vehicle leaves the driving lane of the vehicle while the second-ahead vehicle is detected, the second-ahead vehicle icon is moved from the second display area to the first display area. [Effects of the Invention]

[0009] According to each aspect of the present invention, in addition to the inter-vehicle distance between the subject vehicle and the preceding vehicle, the presence of the vehicle ahead that is recognized by the system can be appropriately displayed to the user. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram showing an in-vehicle display system according to an embodiment; [Figure 2] FIG. 10 is a diagram illustrating an example of a display. [Figure 3] 1A is a diagram showing a situation in which the actual inter-vehicle distance between the host vehicle and the preceding vehicle is less than a first distance threshold, and FIG. 1B is a diagram showing an example of a preceding vehicle icon displayed in the near display area. [Figure 4] 1A is a diagram showing an example of a display when a preceding vehicle changes lanes, and FIG. 1B is a diagram showing an example of a change in the position of a preceding vehicle icon due to a preceding vehicle changing lanes. [Figure 5]10 is a flowchart illustrating an example of a preceding vehicle icon display process. [Figure 6] 10 is a flowchart showing an example of a preceding vehicle lane change process. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] Fig. 1 is a block diagram showing an embodiment of an in-vehicle display system 100. The in-vehicle display system 100 shown in Fig. 1 is mounted on a vehicle such as a passenger car or a freight vehicle (hereinafter referred to as the host vehicle), and is a device that displays images according to the surrounding conditions of the vehicle.

[0013] The host vehicle has a function of controlling the speed of the host vehicle so that the distance between the host vehicle and a preceding vehicle traveling in front of the host vehicle on the traveling lane of the host vehicle becomes a target distance. The host vehicle may have a driving assistance function such as ACC (Adaptive Cruise Control) or an automatic driving function including vehicle speed control. The target distance is a set value that serves as a reference for controlling the speed of the host vehicle relative to the preceding vehicle traveling in front of the host vehicle.

[0014] [Configuration of in-vehicle display system] The configuration of an in-vehicle display system 100 according to this embodiment will be described below with reference to the drawings. As shown in FIG. 1, the in-vehicle display system 100 includes a display control ECU (Electronic Control Unit) 10 that performs overall management of the device. The display control ECU 10 is an electronic control unit having a CPU (Central Processing Unit) and a storage unit. The storage unit is composed of, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), and an EEPROM (Electrically Erasable Programmable Read-Only Memory). The display control ECU 10 realizes various functions by, for example, executing programs stored in the storage unit in the CPU.

[0015] An external sensor 1 and a display 2 are connected to the display control ECU 10. The external sensor 1 is a detection device that detects the surrounding conditions of the host vehicle, such as a preceding vehicle. The external sensor 1 includes at least one of a camera and a radar sensor. The camera is an imaging device that captures images of the external conditions of the host vehicle. The camera is provided, for example, behind the windshield of the host vehicle and captures images in front of the vehicle. The camera transmits the captured images of the external conditions of the host vehicle to the display control ECU 10. The radar sensor is a detection device that detects objects around the host vehicle using radio waves (for example, millimeter waves) or light. The radar sensor includes, for example, millimeter wave radar or LiDAR (Light Detection and Ranging). The radar sensor transmits information about the detected objects to the display control ECU 10.

[0016] The display 2 is a display device provided in the cabin of the vehicle. The display 2 may be a center display, a multi-information display (MID), or a head-up display (HUD). The display 2 displays various information in response to control signals from the display control ECU 10.

[0017] Next, a description will be given of the functional configuration of the display control ECU 10. The display control ECU 10 has an other vehicle detection unit 11 and a display control unit 12. Note that the display control ECU 10 may be configured from a plurality of electronic units.

[0018] The other vehicle detection unit 11 detects other vehicles around the host vehicle based on the detection results of the external sensor 1. The other vehicle detection unit 11 detects a preceding vehicle traveling ahead of the host vehicle on the driving lane in which the host vehicle is traveling. The other vehicle detection unit 11 recognizes the inter-vehicle distance between the host vehicle and the preceding vehicle. In addition, the other vehicle detection unit 11 detects a lane change by the preceding vehicle when the preceding vehicle crosses a white line and changes lanes from the driving lane to an adjacent lane.

[0019] When a preceding vehicle is detected, the other vehicle detection unit 11 detects a vehicle ahead of the preceding vehicle. The preceding vehicle to be detected may be limited to other vehicles within a certain distance from the host vehicle. Similarly, the vehicle ahead of the preceding vehicle to be detected may be limited to other vehicles within a certain distance from the host vehicle.

[0020] When the ignition of the host vehicle is turned on, the display control unit 12 displays a host vehicle icon in the driving lane area of ​​the display 2. When a preceding vehicle is detected by the other vehicle detection unit 11, the display control unit 12 displays a preceding vehicle icon in front of the host vehicle icon in the driving lane area.

[0021] FIG. 2 is a diagram showing an example of a display. FIG. 2 shows a driving lane area RA, a left line LA1 and a right line LA2 that form the driving lane area RA, a host vehicle icon MA, a preceding vehicle icon NF, and a preceding vehicle icon NS. The shape of each icon is not particularly limited as long as the user can understand that the icon corresponds to the host vehicle or the preceding vehicle. The position of the host vehicle icon MA may or may not be fixed. The preceding vehicle icon NF and the preceding vehicle icon NS may have the same shape or different shapes.

[0022] 2 also shows a near display area P, a first display area P1, and a second display area P2 set on the driving lane area RA. The near display area P is an area located near the host vehicle icon MA on the driving lane area RA. The first display area P1 is an area located behind the near display area P when viewed from the host vehicle icon MA on the driving lane area RA. The first display area P1 only needs to be large enough to display at least one preceding vehicle icon NF. The first display area P1 is an area set on the driving lane area RA, for example, imagining a point 100 m ahead of the host vehicle M.

[0023] The second display area P2 is an area located behind the first display area P1 in the driving lane area RA when viewed from the host vehicle icon MA. The second display area P2 only needs to be large enough to display at least one second-ahead vehicle icon NS. The second display area P2 is an area set in the driving lane area RA, for example, to represent a point 120 m ahead of the host vehicle M. In this way, the display control unit 12 displays the preceding vehicle and the second-ahead vehicle in two stages.

[0024] The display on the display 2 is not limited to the top-down type display shown in FIG. 2, and various display modes that allow the user to recognize the situation around the vehicle can be adopted.

[0025] The display control unit 12 changes the display position of the preceding vehicle icon NF on the display depending on the inter-vehicle distance between the host vehicle and the preceding vehicle. Here, FIG. 3(a) is a diagram showing a situation in which the actual inter-vehicle distance between the host vehicle and the preceding vehicle is less than a first distance threshold. FIG. 3(a) shows the host vehicle M and the preceding vehicle N. It also shows the inter-vehicle distance D between the host vehicle M and the preceding vehicle N and the first distance threshold T. The first distance threshold T may be set, for example, taking into account the size of the near display area P on the display 2. FIG. 3(b) is a diagram showing an example of the display of the preceding vehicle icon NF in the near display area P.

[0026] As shown in FIGS. 3(a) and 3(b), when the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is less than the first distance threshold T, the display control unit 12 displays the preceding vehicle icon NF in the near display area P. The display control unit 12 also changes the position of the preceding vehicle icon NF in the near display area P according to the inter-vehicle distance D between the host vehicle M and the preceding vehicle N. The display control unit 12 moves the preceding vehicle icon NF so that it approaches the first display area P1 at the back of the near display area P as the inter-vehicle distance D becomes longer. The display control unit 12 moves the preceding vehicle icon NF in the near display area P so that it approaches the host vehicle icon MA as the inter-vehicle distance D becomes shorter.

[0027] Furthermore, the display control unit 12 may change the lateral position of the preceding vehicle icon NF in the near display area P according to the lateral position of the preceding vehicle N relative to the host vehicle M or the driving lane R. The lateral position of the preceding vehicle N relative to the host vehicle M or the driving lane R can be detected by the external sensor 1. For example, the display control unit 12 can change the lateral position of the preceding vehicle icon NF to the left or right when the deviation of the lateral position of the preceding vehicle N from the center of the host vehicle M or the driving lane R exceeds a certain distance. The display control unit 12 may continuously change the lateral position of the preceding vehicle icon NF according to the lateral position of the preceding vehicle N.

[0028] In Fig. 3(a), the preceding vehicle N is traveling to the right to change lanes. In this case, the display control unit 12 may display the preceding vehicle icon NF in the near display area P shifted to the right, as shown in Fig. 3(b). This allows the user to understand the behavior of the preceding vehicle N in more detail from the position of the preceding vehicle icon NF.

[0029] When the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is equal to or greater than the first distance threshold T, the display control unit 12 displays a preceding vehicle icon NF in the first display area P1 (see FIG. 2). The position of the preceding vehicle icon NF displayed in the first display area P1 may or may not be fixed. The preceding vehicle icon NF only needs to be displayed within the first display area P1, which has a certain degree of size.

[0030] When the preceding vehicle icon NF is displayed and the other vehicle detection unit 11 detects a vehicle ahead of the preceding vehicle, the display control unit 12 displays a vehicle ahead of the preceding vehicle icon NS in the second display area P2 as shown in FIG. 2 (see FIG. 2). The position of the vehicle ahead of the preceding vehicle icon NS displayed in the second display area P2 may or may not be fixed. The vehicle ahead of the preceding vehicle icon NS may be displayed within the second display area P2 having a certain degree of size. This allows the user to confirm the presence of the vehicle ahead of the preceding vehicle on the display 2.

[0031] When the preceding vehicle N changes lanes, the display control unit 12 may display a preceding vehicle icon NF in the adjacent lane area on the display 2. Here, FIG. 4(a) is a diagram showing an example of a display when the preceding vehicle changes lanes. FIG. 4(a) shows the adjacent lane area RB. The adjacent lane area RB is an area provided to the right of the driving lane area RA. The adjacent lane area RB is also provided to the left of the driving lane area RA.

[0032] For example, when the preceding vehicle N changes lanes, the display control unit 12 displays a preceding vehicle icon NF in the adjacent lane area RB on the lane change side of the preceding vehicle N. The position of the preceding vehicle icon NF in the adjacent lane area RB may or may not be fixed.

[0033] When the preceding vehicle N changes lanes, the display control unit 12 does not necessarily have to display the preceding vehicle icon NF in the adjacent lane area RB. The display control unit 12 may change whether or not to display the preceding vehicle icon NF in the adjacent lane area RB depending on the inter-vehicle distance D between the host vehicle M and the preceding vehicle N at the time of the lane change.

[0034] Specifically, when the inter-vehicle distance D between the preceding vehicle N and the host vehicle M at the time of lane change is equal to or greater than the second distance, the display control unit 12 does not need to display the preceding vehicle icon NF after the lane change. When the inter-vehicle distance D at the time of lane change is less than the second distance threshold, the display control unit 12 displays the preceding vehicle icon in the adjacent lane area RB. The second distance threshold is a threshold corresponding to a distance shorter than the first distance threshold T. This allows the user to reduce unnecessary displays when the preceding vehicle N changes lanes at a position away from the host vehicle M, as this has little impact on the driving of the host vehicle M. The display control unit 12 deletes the display of the preceding vehicle icon NF in the adjacent lane area RB, for example, after a certain period of time has elapsed.

[0035] When the preceding vehicle N departs from the driving lane R due to a lane change or the like, and the second preceding vehicle icon NS is displayed in the second display area P2, the display control unit 12 moves the second preceding vehicle icon NS from the second display area P2 to the first display area P1. FIG. 4(b) is a diagram showing an example in which the display of the second preceding vehicle icon NS is changed due to the preceding vehicle N changing lanes. As shown in FIG. 4(b), the display control unit 12 displays the preceding vehicle icon NF to the user as a new preceding vehicle N in place of the preceding vehicle N that has changed lanes.

[0036] [Control method for in-vehicle display system] Next, a control method for the in-vehicle display system 100 according to this embodiment will be described with reference to the drawings. Fig. 5 is a flowchart showing an example of a preceding vehicle icon display process. The preceding vehicle icon display process shown in Fig. 5 is executed when the user turns on the display of the surrounding conditions of the vehicle.

[0037] 5, the display control ECU 10 of the in-vehicle display system 100 determines in S10 whether the other vehicle detection unit 11 has detected a preceding vehicle. If it is determined that a preceding vehicle N has been detected (S10: YES), the display control ECU 10 proceeds to S11. If it is not determined that a preceding vehicle N has been detected (S10: NO), the display control ECU 10 ends this processing.

[0038] In S11, the display control ECU 10 determines, via the display control unit 12, whether or not the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is less than the first distance threshold T. If the display control ECU 10 determines that the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is less than the first distance threshold T (S11: YES), the display control ECU 10 proceeds to S12. If the display control ECU 10 does not determine that the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is less than the first distance threshold T (S11: NO), the display control ECU 10 proceeds to S13.

[0039] In S12, the display control ECU 10 causes the display control unit 12 to display a preceding vehicle icon NF in the near display area P. The display control unit 12 adjusts the display position of the preceding vehicle icon NF in accordance with the inter-vehicle distance D between the host vehicle M and the preceding vehicle N. Thereafter, the display control ECU 10 proceeds to S14.

[0040] In S13, the display control ECU 10 causes the display control unit 12 to display a preceding vehicle icon NF in the first display area P1. The position of the preceding vehicle icon NF displayed in the first display area P1 may or may not be fixed. Thereafter, the display control ECU 10 proceeds to S14.

[0041] In S14, the display control ECU 10 determines whether or not the vehicle ahead of the vehicle has been detected by the other vehicle detection unit 11. If it is determined that the vehicle ahead of the vehicle has been detected (S14: YES), the display control ECU 10 proceeds to S15. If it is not determined that the vehicle ahead of the vehicle has been detected (S14: NO), the display control ECU 10 ends this processing.

[0042] 6 is a flowchart showing an example of the preceding vehicle lane change process, which is executed when the preceding vehicle icon NF is displayed.

[0043] 6, in S20, the display control ECU 10 determines whether the preceding vehicle N has changed lanes using the other vehicle detection unit 11. If it is determined that the preceding vehicle N has changed lanes (S20: YES), the display control ECU 10 proceeds to S21. If it is not determined that the preceding vehicle N has changed lanes (S20: NO), the display control ECU 10 ends this processing.

[0044] In S21, the display control unit 12 determines whether the inter-vehicle distance D between the host vehicle M and the preceding vehicle N at the time of lane change is less than the first distance threshold T. If it is determined that the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is less than the first distance threshold T (S21: YES), the display control ECU 10 proceeds to S22. If it is not determined that the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is less than the first distance threshold T (S21: NO), the display control ECU 10 proceeds to S23.

[0045] In S22, the display control ECU 10 causes the display control unit 12 to delete the preceding vehicle icon NF from the near display area P and display the preceding vehicle icon NF in the adjacent lane area RB. The display control ECU 10 causes the display control unit 12 to display the preceding vehicle icon NF in the adjacent lane area RB on the side where the preceding vehicle N has changed lanes, out of the left and right adjacent lane areas RB. Thereafter, the display control ECU 10 proceeds to S24.

[0046] In S23, the display control ECU 10 deletes the preceding vehicle icon NF from the first display area P1 by the display control unit 12. Thereafter, the display control ECU 10 proceeds to S24.

[0047] In S24, the display control ECU 10 determines whether the second preceding vehicle icon NS is being displayed by the display control unit 12. If it is determined that the second preceding vehicle icon NS is being displayed (S24: YES), the display control ECU 10 proceeds to S25. If it is not determined that the second preceding vehicle icon NS is being displayed (S24: NO), the display control ECU 10 ends this processing.

[0048] In S25, the display control ECU 10 moves the second-preceding vehicle icon NS from the second display area P2 to the first display area P1 using the display control unit 12. After that, the display control ECU 10 ends the current processing.

[0049] According to the in-vehicle display system 100 and the control method thereof according to the present embodiment described above, by providing the second display area P2 for displaying the second-ahead vehicle icon NS within the display 2, it is possible to appropriately display to the user not only the inter-vehicle distance D between the host vehicle M and the preceding vehicle N, but also the presence of the second-ahead vehicle recognized by the system. Furthermore, in the in-vehicle display system 100, when the inter-vehicle distance D between the host vehicle M and the preceding vehicle N is less than the first distance threshold T, the preceding vehicle icon NF is displayed within the near display area P according to the inter-vehicle distance D. Furthermore, the in-vehicle display system 100 moves the preceding vehicle icon NF so that the longer the inter-vehicle distance D, the closer the preceding vehicle icon NF is to the first display area P1, so that the user can intuitively grasp the inter-vehicle distance D from the display 2.

[0050] According to the in-vehicle display system 100, when the preceding vehicle N departs from the driving lane R due to a lane change or the like, if a vehicle ahead of the preceding vehicle is detected, the preceding vehicle icon NS is moved from the second display area P2 to the first display area P1, so that the user can easily grasp the presence of a new preceding vehicle compared to conventional systems in which the preceding vehicle icon NS is not displayed.

[0051] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. The present invention can be embodied in various forms, including the above-described embodiments, with various modifications and improvements made based on the knowledge of those skilled in the art.

[0052] The in-vehicle display system 100 does not necessarily have to detect a lane change by the preceding vehicle N. The in-vehicle display system 100 does not necessarily have to provide an adjacent lane area RB on the display 2, and does not necessarily have to display a preceding vehicle icon NF corresponding to the preceding vehicle N after the lane change in the adjacent lane area RB. Furthermore, the in-vehicle display system 100 does not necessarily have to be able to change the lateral position of the preceding vehicle icon NF in the near display area P. The in-vehicle display system 100 does not necessarily have to display the host vehicle icon MA. [Explanation of symbols]

[0053] 1...external sensor, 2...display, 10...display control ECU, 11...other vehicle detection unit, 12...display control unit, 100...in-vehicle display system, D...inter-vehicle distance, M...own vehicle, NF...preceding vehicle icon, N...preceding vehicle, NS...second-preceding vehicle icon, P...front display area, P1...first display area, P2...second display area, R...driving lane, RA...driving lane area, T...first distance threshold.

Claims

1. An in-vehicle display system that is mounted on a vehicle and displays a situation around the vehicle on a display inside the vehicle, a display control unit that displays a preceding vehicle icon on a driving lane area of ​​the display when a preceding vehicle traveling ahead of the host vehicle is detected; the driving lane area has a near side display area, a first display area located behind the near side display area, and a second display area located behind the first display area, the display control unit, when the inter-vehicle distance between the host vehicle and the preceding vehicle is less than a first distance threshold, displays the preceding vehicle icon in the near display area according to the inter-vehicle distance, and moves the preceding vehicle icon so that the longer the inter-vehicle distance, the closer the preceding vehicle icon is to the first display area at the back of the near display area; and when the inter-vehicle distance is equal to or greater than the first distance threshold, displays the preceding vehicle icon in the first display area; When a second preceding vehicle traveling ahead of the preceding vehicle is detected, a second preceding vehicle icon is displayed in the second display area; An in-vehicle display system that moves the second preceding vehicle icon from the second display area to the first display area if the preceding vehicle leaves the lane of the vehicle while the second preceding vehicle is detected.

2. 2. The in-vehicle display system of claim 1, wherein the display control unit changes the lateral position of the preceding vehicle icon in the driving lane area according to the lateral position of the preceding vehicle relative to the driving lane when the inter-vehicle distance between the host vehicle and the preceding vehicle is less than the first distance threshold.

3. 3. The in-vehicle display system of claim 1, wherein when the preceding vehicle changes lanes from the driving lane to an adjacent lane, if the inter-vehicle distance between the preceding vehicle and the subject vehicle at the time of the lane change is less than a second distance threshold that is shorter than the first distance threshold, the display control unit displays the preceding vehicle icon on an adjacent lane area adjacent to the driving lane area, and if the inter-vehicle distance between the preceding vehicle and the subject vehicle at the time of the lane change is equal to or greater than the second distance, the display control unit does not display the preceding vehicle icon after the lane change.

4. A control method for an in-vehicle display system that is mounted on a vehicle and displays a situation around the vehicle on a display inside the vehicle, comprising: When a preceding vehicle traveling ahead of the host vehicle is detected, a preceding vehicle icon is displayed on the driving lane area of ​​the display; the driving lane area has a near side display area, a first display area located behind the near side display area, and a second display area located behind the first display area, When the inter-vehicle distance between the host vehicle and the preceding vehicle is less than a first distance threshold, the preceding vehicle icon is displayed in the near display area according to the inter-vehicle distance, and the preceding vehicle icon is moved so that the longer the inter-vehicle distance, the closer the preceding vehicle icon is to the first display area at the back of the near display area, and when the inter-vehicle distance is equal to or greater than the first distance threshold, the preceding vehicle icon is displayed in the first display area; When a second preceding vehicle traveling ahead of the preceding vehicle is detected, a second preceding vehicle icon is displayed in the second display area; A control method for an in-vehicle display system, which moves the second-ahead vehicle icon from the second display area to the first display area if the preceding vehicle leaves the vehicle's driving lane while the second-ahead vehicle is detected.

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