WO2017086380A1

WO2017086380A1 - Information display apparatus, control method, program, and storage medium

Info

Publication number: WO2017086380A1
Application number: PCT/JP2016/084079
Authority: WO
Inventors: 哲也藤栄
Original assignee: パイオニア株式会社
Priority date: 2015-11-20
Filing date: 2016-11-17
Publication date: 2017-05-26

Abstract

According to the present invention, a display system 100 includes: a navigation apparatus 1; a head-up display 2; and a mobile phone 3. The head-up display 2 changes to a simple display mode that is a display mode for reducing the amount of information displayed as a virtual image Iv, when a hands-free phone call is detected on the mobile phone 3 linked to the navigation apparatus 1. Then, the head-up display 2 displays guidance information about the next guide point as a virtual image Iv in the simple display mode.

Description

Information display device, control method, program, and storage medium

The present invention relates to a technique for displaying an image superimposed on a landscape image.

Conventionally, a technique for ensuring the safety of a driver's hands-free call is known. For example, Patent Document 1 discloses a system that warns a driver by highlighting a traffic light or a traffic sign using a display on a head-up display when the use of a mobile phone is detected. .

JP 2000-33289 A

Generally, since the driver cannot concentrate on the display of the head-up display during a call more than usual, if a traffic light or traffic sign is highlighted during a driver's call, there is a risk that the driver will be overloaded. Therefore, the main object of the present invention is to suitably realize a reduction in driver's load and ensuring safety during a hands-free call.

The invention according to claim 1 is an information display device that reflects light constituting information and displays the information as a virtual image, and includes a detection unit that detects a phone call and displays the information as a virtual image. A display control unit, wherein the display control unit reduces an amount of the information displayed as a virtual image when the detection unit detects a call of the mobile phone.

The invention according to claim 10 is a control method executed by an information display device that reflects light constituting information and displays the information as a virtual image, the detection step of detecting a call of a mobile phone, and the detection And a display control step for reducing the amount of the information displayed as a virtual image when the mobile phone call is detected in the step.

The invention according to claim 11 is a program executed by a computer of an information display device that reflects light constituting information and displays the information as a virtual image, the detection unit detecting a call on a mobile phone, When the detection unit detects a call of the mobile phone, the computer is caused to function as a display control unit that reduces the amount of the information displayed as a virtual image.

1 shows a schematic configuration of a display system. 1 shows a schematic configuration of a navigation device. 1 shows a schematic configuration of a head-up display. The function structure of a light source unit is shown. 3 is a flowchart according to the first embodiment. It is a display example in a normal display mode. It is the 1st display example of simple display mode. It is a 2nd display example of simple display mode. It is a flowchart concerning a 2nd embodiment. It is a flowchart which concerns on 3rd Embodiment.

In one preferred embodiment of the present invention, an information display device that reflects light constituting information and displays the information as a virtual image, a detection unit that detects a call of a mobile phone, and the information as a virtual image. A display control unit for displaying, and the display control unit reduces an amount of the information displayed as a virtual image when the detection unit detects a call of the mobile phone.

The information display device includes a detection unit that detects a mobile phone call and a display control unit that displays information as a virtual image. The display control unit reduces the amount of information displayed as a virtual image when the detection unit detects a phone call. According to this aspect, the information display device can suitably reduce the load on the user during a call on the mobile phone.

In one aspect of the information display device, the information display device further includes an information generation unit that generates route guidance information as the information, and the display control unit detects the mobile phone call. In such a case, only at least a part of the guidance information is displayed. In this aspect, the information display device can appropriately reduce the load on the user by limiting the information displayed during the call to the guidance information for route guidance.

In another aspect of the information display device, the display control unit guides route guidance regarding a next guide point where a user who visually recognizes the virtual image passes when the detection unit detects a call on the mobile phone. Hide some or all of the information other than information. According to this aspect, the information display device can appropriately reduce the amount of information to be displayed for information with low priority that should be visually recognized by the user.

In another aspect of the information display device, the display control unit guides route guidance regarding a next guide point where a user who visually recognizes the virtual image passes when the detection unit detects a call on the mobile phone. Display information only. According to this aspect, the information display device can suitably reduce the user's load by suitably limiting the guidance information displayed during a call to only the information that is required most recently.

In another aspect of the information display device, the display control unit is within a predetermined distance to a guide point where the detection unit detects a call on the mobile phone and the user who views the virtual image passes next. The amount of information is reduced when approaching. By this aspect, when the information display device approaches a point where guidance is required, the information necessary for passing through the point can be preferentially viewed by the user, and the information to be displayed becomes unnecessary. Limiting can be suitably suppressed.

In another aspect of the information display device, the information display device continues the call when the user who views the virtual image passes the next guide point when the detection unit detects the call of the mobile phone. The display control unit further reduces the amount of the information when the prediction unit predicts that a call is continued when passing through the guide point. In this way, the information display device preferably suppresses unnecessary restriction of the information to be displayed by hiding some information when it is predicted that the call is continued when passing the guidance point. can do.

In another aspect of the information display device, the prediction unit includes history information of a call time with the other party of the mobile phone call detected by the detection unit, an expected time required to reach the guide point, and On the basis of whether or not the call is continued. According to this aspect, the information display device can accurately determine whether or not the call is continued when passing through the guide point.

In another aspect of the information display device, the display control unit is within a predetermined distance to a guide point where the detection unit detects a call on the mobile phone and the user who views the virtual image passes next. When the vehicle approaches, the amount of the information is reduced regardless of whether or not the prediction unit predicts that the call is continued when passing through the guide point. By this aspect, the information display apparatus can make a user visually recognize required guidance information, when approaching a guidance point.

In another aspect of the information display device, the detection unit further detects transmission or reception of the mobile phone, and the display control unit detects that the detection unit detects transmission or reception of the mobile phone. The amount of the information displayed as a virtual image is reduced. Even in this aspect, the information display device can suitably reduce the load on the user who is paying attention to the mobile phone.

In another preferred embodiment of the present invention, a control method executed by an information display device that reflects light constituting information and displays the information as a virtual image, the detecting step detecting a call of a mobile phone, A display control step of reducing the amount of the information displayed as a virtual image when the mobile phone call is detected in the detection step. By executing this control method, the information display device can suitably reduce the load on the user during a mobile phone call.

In another preferred embodiment of the present invention, a program executed by a computer of an information display device that reflects light constituting information and displays the information as a virtual image, the detection unit detecting a call on a mobile phone; When the detection unit detects a call of the mobile phone, the computer is caused to function as a display control unit that reduces the amount of the information displayed as a virtual image. By executing this program, the computer can favorably reduce the load on the user during a mobile phone call. Preferably, the program is stored in a storage medium.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Schematic configuration]
(1) System Configuration FIG. 1 shows a configuration example of a display system 100 according to the embodiment. As shown in FIG. 1, the display system 100 is mounted on a vehicle and includes a navigation device 1, a head-up display 2, and a mobile phone 3. Then, the display system 100 simplifies the display during the hands-free call, thereby reducing the driving load and ensuring safety.

The navigation device 1 has a function of performing route guidance from the departure point to the destination. The navigation device 1 can be, for example, a stationary navigation device installed in a vehicle or a portable terminal such as a PND (Portable Navigation Device). The navigation device 1 communicates with the mobile phone 3 at the time of a hands-free call, exchanges voice data necessary for a call by the mobile phone 3, and inputs / outputs voice.

The head-up display 2 generates an image (also referred to as “display image”) that displays information for assisting driving, and visually recognizes the display image as a virtual image from the position (eye point) of the driver. Various information necessary for displaying the display image is supplied from the navigation device 1 to the head-up display 2. The head-up display 2 is an example of the “information display device” in the present invention.

The mobile phone 3 is a mobile phone having a hands-free function. The mobile phone 3 is connected to the navigation device 1 by wireless communication using Bluetooth (registered trademark) or wired communication through a cable, and is used for information necessary for a hands-free call. Give and receive. Further, when the mobile phone 3 detects an incoming call or outgoing call, the mobile phone 3 notifies the head-up display 2 that a hands-free call is to be made via the navigation device 1 or directly.

(2) Configuration of Navigation Device FIG. 2 shows the configuration of the navigation device 1. As shown in FIG. 2, the navigation device 1 includes a self-supporting positioning device 10, a GPS receiver 18, a system controller 20, a disk drive 31, a data storage unit 36, a communication interface 37, a communication device 38, an interface 39, and a display unit 40. A voice output unit 50 and an input device 60.

The self-supporting positioning device 10 includes an acceleration sensor 11, an angular velocity sensor 12, and a distance sensor 13. The acceleration sensor 11 is made of, for example, a piezoelectric element, detects vehicle acceleration, and outputs acceleration data. The angular velocity sensor 12 is composed of, for example, a vibrating gyroscope, detects the angular velocity of the vehicle when the direction of the vehicle is changed, and outputs angular velocity data and relative azimuth data. The distance sensor 13 measures a vehicle speed pulse composed of a pulse signal generated with the rotation of the vehicle wheel.

The GPS receiver 18 receives radio waves 19 carrying downlink data including positioning data from a plurality of GPS satellites. The positioning data is used to detect the absolute position of the vehicle (that is, the current position) from latitude and longitude information.

The system controller 20 includes an interface 21, a CPU (Central Processing Unit) 22, a ROM (Read Only Memory) 23, and a RAM (Random Access Memory) 24, and controls the entire navigation device 1. For example, in this embodiment, the system controller 20 searches for a route to a destination set by user input, output control for performing guidance along the determined route, and data with the mobile phone 3 during a hands-free call. Controls communication and voice input / output.

The interface 21 performs an interface operation with the acceleration sensor 11, the angular velocity sensor 12, the distance sensor 13, and the GPS receiver 18. From these, vehicle speed pulses, acceleration data, relative azimuth data, angular velocity data, GPS positioning data, absolute azimuth data, and the like are input to the system controller 20. The CPU 22 controls the entire system controller 20. The ROM 23 includes a nonvolatile memory (not shown) in which a control program for controlling the system controller 20 is stored. The RAM 24 stores various data such as route data preset by the user via the input device 60 so as to be readable, and provides a working area to the CPU 22.

A system controller 20, a disk drive 31 such as a CD-ROM drive or a DVD-ROM drive, a data storage unit 36, a communication interface 37, a display unit 40, an audio output unit 50 and an input device 60 are mutually connected via a bus line 30. It is connected to the.

The disk drive 31 reads and outputs content data such as music data and video data from a disk 33 such as a CD or DVD under the control of the system controller 20. The disk drive 31 may be either a CD-ROM drive or a DVD-ROM drive, or may be a CD and DVD compatible drive.

The data storage unit 36 is configured by, for example, an HDD or the like, and stores various data used for navigation processing such as map data. The map data includes road data represented by links corresponding to roads and nodes corresponding to road connecting portions, facility information about each facility, and the like.

The communication device 38 is composed of, for example, an FM tuner, a beacon receiver, a portable terminal, a dedicated communication module, and the like, and via a communication interface 37, traffic jams distributed from a VICS (registered trademark, Vehicle Information Communication System) center Receive road traffic information such as traffic information and other information. In addition, the communication device 38 transmits information necessary for displaying the display image to the head-up display 2. In addition, the communication device 38 exchanges information necessary for the hands-free call with the mobile phone 3.

The display unit 40 displays various display data on a display device such as a display under the control of the system controller 20. Specifically, the system controller 20 reads map data from the data storage unit 36. The display unit 40 displays a map or the like based on the map data read from the data storage unit 36 by the system controller 20 on the display screen. The display unit 40 includes a graphic controller 41 that controls the entire display unit 40 based on control data sent from the CPU 22 via the bus line 30 and a memory such as a VRAM (Video RAM), and can display image information that can be displayed immediately. A buffer memory 42 that temporarily stores, a display control unit 43 that controls display of a display 44 such as a liquid crystal or a CRT (Cathode Ray Tube) based on image data output from the graphic controller 41, and a display 44 are provided. . The display 44 functions as an image display unit, and includes, for example, a liquid crystal display device having a diagonal size of about 5 to 10 inches and is mounted near the front panel in the vehicle.

The audio output unit 50 is a D / A converter 51 that performs D / A (Digital to Analog) conversion of audio digital data sent from the disk drive 31 or the RAM 24 via the bus line 30 under the control of the system controller 20. , An amplifier (AMP) 52 that amplifies the audio analog signal output from the D / A converter 51, and a speaker 53 that converts the amplified audio analog signal into sound and outputs the sound into the vehicle.

The input device 60 includes keys, switches, buttons, a remote controller, a touch panel, and a voice input device that accepts voice input during a hands-free call for inputting various commands and data. In the case of a stationary navigation device, the input device 60 is disposed around the front panel and the display 44 of the main body of the in-vehicle electronic system mounted in the vehicle.

(3) Configuration of Head-Up Display FIG. 3 is a schematic configuration diagram of the head-up display 2. As shown in FIG. 3, the head-up display 2 according to the present embodiment mainly includes a light source unit 4, a screen 7, and a combiner 8, and includes a front window 25, a ceiling portion 27, and a hood 28. The vehicle is provided with a dashboard 29.

The light source unit 4 is provided in the dashboard 29 and emits light constituting a display image (also simply referred to as “display light”) toward the screen 7 provided in the dashboard 29. In this case, the display light reflected by the screen 7 reaches the combiner 8 through the opening 89 provided in the dashboard 29, and further reflects by the combiner 8 to reach the position of the driver's eyes. In this way, the light source unit 4 causes the display light to reach the position of the driver's eyes and causes the driver to visually recognize the virtual image “Iv”.

The screen 7 is a reflective optical member that generates an intermediate image, and functions as an exit pupil magnifier (EPE). For example, the screen 7 is formed with a microlens array in which a plurality of microlenses are arranged on a surface on which light from the light source unit 4 is incident, and a reflection surface is formed on a surface opposite to the microlens array. The

The combiner 8 is an optical member that projects the light constituting the intermediate image generated by the screen 7 and causes the observer to visually recognize the virtual image Iv by partially reflecting the projected light to the position of the driver's eyes. is there. Preferably, the display light reflecting surface of the combiner 8 has a substantially concave shape. Thereby, the combiner 8 enlarges and displays the virtual image Iv. In the present embodiment, the combiner 8 is installed on the dashboard 29 as an example.

The installation position of the light source unit 1 is not limited to being inside the dashboard 29 as shown in FIG. For example, the light source unit 1 may be in an aspect (including an aspect in which the light source unit 1 is attached to a sun visor not shown) attached to the ceiling portion 27. Further, the head-up display 2 may be configured to reflect light from the screen 7 to the driver's eyes by the front window 25 instead of having the combiner 8.

FIG. 4 is a diagram schematically showing the configuration of the light source unit 4. As shown in FIG. 4, the light source unit 4 includes a light source 54, a control unit 55, and a communication unit 56.

The light source 54 has, for example, laser light sources of red, blue, and green, and emits display light for displaying a display image as a virtual image Iv based on the control of the control unit 55.

The communication unit 56 receives various information necessary for displaying the display image from the navigation device 1 based on the control of the control unit 55. For example, the communication unit 56 receives information necessary for generating a display image such as guide route information and current position information from the navigation device 1. In addition, the communication unit 56 receives information from the navigation device 1 or the mobile phone 3 that a hands-free call is started.

The control unit 55 includes a CPU, a ROM that stores a control program executed by the CPU, data, and the like, and a RAM that sequentially reads and writes various data as a work memory when the CPU operates. Control. For example, the control unit 55 generates a display image based on the information received from the navigation device 1 and causes the light source 54 to emit display light of the generated display image. The control unit 55 is an example of a computer that executes the “detection unit”, “display control unit”, “information generation unit”, “prediction unit”, and program in the present invention.

[Simplified display during a hands-free call]
Next, specific forms (first to third embodiments) of display control of the head-up display 2 resulting from a hands-free call will be described.

(First embodiment)
In the first embodiment, the head-up display 2 is a display mode (also referred to as “simple display mode”) in which the amount of information indicated by the display image to be displayed as the virtual image Iv is reduced compared to the normal time during a hands-free call. Execute. As a result, the driving load during a call is reduced and safety is ensured.

FIG. 5 is a flowchart showing a display processing procedure of the head-up display 2 according to the first embodiment.

First, the head-up display 2 determines whether or not a hands-free call is being executed (step S101). When the head-up display 2 determines that a hands-free call is being executed (step S101; Yes), the head-up display 2 shifts to a simple display mode in which the amount of information to be displayed is reduced (step S102).

On the other hand, when it is determined that the hands-free call is not being executed (step S101; No), the head-up display 2 is also referred to as a normal display mode (“normal display mode”) in which there is no display restriction due to the hands-free call. ) Will continue to be displayed. Then, the head-up display 2 determines again whether or not a hands-free call is being executed in step S101.

Next, each display mode in the normal display mode and the simple display mode will be described.

FIG. 6 shows a display example of the head-up display 2 in the normal display mode. In the example of FIG. 6, the head-up display 2 is a virtual image of speed information 81, facility information 82, map information 83, first traveling direction information 84, and second traveling direction information 85 via the combiner 8. It is displayed as Iv. The speed information 81, the facility information 82, the map information 83, the first traveling direction information 84, and the second traveling direction information 85 are examples of “guidance information” in the present invention.

Here, the head-up display 2 uses the output data of the self-supporting positioning device 10 supplied from the navigation device 1 and the map data stored in the data storage unit 36 as vehicle speed information (here 43 km / h) as speed information 81. And information on the speed limit (50 km / h in this case) of the road that is running is displayed. Further, the head-up display 2 is associated with a building that overlaps the combiner 8 in the driver's field of view as facility information 82 based on the map data supplied from the navigation device 1 and the current position information, etc. Genre (here, restaurant) is displayed. Further, the head-up display 2 displays a map of the road on which the vehicle is traveling and its connected road as the map information 83. Further, the head-up display 2 uses the map data, the current position information, the guide route information, and the like supplied from the navigation device 1 as the first traveling direction information 84 as a next guidance point (that is, a traveling direction change). And the distance to the guide point (here, 300 m) and the second direction of travel information 85 (ie, next) are displayed. The direction of travel at the guide point that passes next (in this case, the left direction) and the distance to the guide point (here, 500 m) are displayed.

FIG. 7 shows a display example of the head-up display 2 when the state of FIG. 6 is switched to the simple display mode. As shown in FIG. 7, in the simple display mode, the head-up display 2 hides information other than the first traveling direction information 84. That is, in the simple display mode, the head-up display 2 regards the speed information 81, the facility information 82, the map information 83, and the second traveling direction information 85 as information having a low display priority, and does not display it. Yes.

More specifically, the head-up display 2 displays the speed information 81 even in a meter cluster. Therefore, the head-up display 2 regards the speed information 81 as information having a low display priority and hides it. Further, the head-up display 2 hides the facility information 82 on the assumption that the facility information 82 is not directly related to the guidance to the destination and has lower priority than the information related to the guidance to the destination. Further, the head-up display 2 hides the map information 83 by determining that the display priority is low but not intuitive information, although it is information related to guidance to the destination. On the other hand, since the head-up display 2 is the first traveling direction information 84, it is guidance information related to the next guide point to pass, and it is information that intuitively tells the driver the direction of travel at the guide point. It is determined that the display priority is high and the display is continued. Note that the head-up display 2 regards the second traveling direction information 85 as information having a low priority that does not correspond to necessary information immediately and hides it in principle.

Preferably, when the distance between the next passing guide point and the second passing guide point is short, the head-up display 2 also gives priority to the second traveling direction information 85 relating to the second passing guide point. May be displayed continuously even in the simple display mode.

FIG. 8 is a display example in the simple display mode when the distance between the latest guide point and the second guide point is shorter than a predetermined distance. In the example of FIG. 8, the distance from the current position to the second guide point is only 350 m, and the distance between the nearest guide point and the second guide point is only 50 m. In this case, the head-up display 2 determines that the distance between the next guidance point and the second guidance point is shorter than a predetermined threshold value, and continuously displays the second traveling direction information 85 even in the simple display mode. . In this way, even if the next guide point is reached immediately after passing through the most recent guide point, let the driver know the fact in advance, and the driver will rush after passing the latest guide point Thus, it is possible to suitably suppress the operation of changing the traveling direction.

(Second Embodiment)
In the second embodiment, the head-up display 2 switches from the normal display mode to the simple display mode when a hands-free call is in progress and the distance to the next guide point is within a predetermined distance. The predetermined distance is set to a distance sufficient for the driver to prepare for passing the next guidance point, for example. According to this aspect, the head-up display 2 suitably limits the period during which the simple display mode is executed to a period when the driver needs to visually recognize the information on the guide point.

In general, even during a hands-free call, when traveling on a straight road or the like far to the next guide point, information on the next guide point (first traveling direction information 84 in the examples of FIGS. 6 to 8) It is not necessary to prioritize with other information. Therefore, the head-up display 2 executes the simple display mode only when a hands-free call is in progress and the distance to the next guide point is within a predetermined distance. The predetermined distance described above may be a fixed value (for example, 500 m) or a fluctuation value corresponding to the vehicle speed. In the latter case, the head-up display 2 stores, for example, a correspondence table between the vehicle speed and the predetermined distance in advance, and determines the predetermined distance with reference to the table. For example, the head-up display 2 is set to 400 m when the vehicle speed notified from the navigation device 1 is 50 km / h, and is set to 300 m when the vehicle speed is 40 km / h.

FIG. 9 is a flowchart showing a display processing procedure of the head-up display 2 according to the second embodiment.

First, the head-up display 2 determines whether or not a hands-free call is being executed (step S201). If the head-up display 2 determines that a hands-free call is being performed (step S201; Yes), the head-up display 2 determines whether or not the next guidance point has been approached within a predetermined distance (step S202). For example, the head-up display 2 determines whether or not the next guidance point has been approached within a predetermined distance based on information on the current position supplied from the navigation device 1 and information on the guidance route to the set destination. .

When the head-up display 2 is in a hands-free call (step S201; Yes) and determines that the next guide point is approached within a predetermined distance (step S202; Yes), the simple display mode is entered. Switching is performed (step S203). In the simple display mode, the head-up display 2 displays guidance information regarding the next guidance point as a virtual image Iv. As a result, the head-up display 2 can cause the driver during a hands-free call to preferentially visually recognize the traveling direction at the nearest guide point, and can realize a reduction in driving load. On the other hand, when the heads-up display 2 is not in a hands-free call (step S201; No), or has not approached the next guide point within a predetermined distance (step S202; No), the process returns to step S201. Continue the normal display mode. In other words, in this case, the head-up display 2 determines that there is no guidance information that the driver should immediately view and performs normal display.

(Third embodiment)
In the third embodiment, when detecting a hands-free call, the head-up display 2 predicts whether or not the call will continue to the next guidance point, and normally displays when the call is predicted to continue to the next guidance point. Switch from mode to simple display mode. With this aspect, the head-up display 2 suitably limits the execution period of the simple display mode.

FIG. 10 is a flowchart showing a display processing procedure of the head-up display 2 according to the third embodiment.

First, the head-up display 2 determines whether or not a hands-free call is being executed (step S301). When the head-up display 2 determines that a hands-free call is being executed (step S301; Yes), the head-up display 2 acquires an average call time with the call partner (step S302). In this case, for example, the mobile phone 3 records history information of a call time in one call for each person registered in the phone book. Then, in step S302, the head-up display 2 calculates the average call time by acquiring the call time history information of the call partner together with the notification of the hands-free call from the mobile phone 3. The recording destination of the call time history information in one call is not limited to the mobile phone 3 and may be the navigation device 1 or the head-up display 2. Further, since the head-up display 2 excludes cases where the call time is extremely short or long, the median of the past call time with the call partner may be acquired in step S302 instead of the average call time. Good.

Next, the head-up display 2 predicts the required time to the next guidance point (step S303). For example, the head-up display 2 calculates a predicted value of the required time to the next guidance point based on the distance to the next guidance point and the current vehicle speed.

Then, the head-up display 2 determines whether or not the average call time acquired in step S302 is longer than the required time predicted in step S303 (step S304). Then, if the average call time acquired in step S302 is longer than the required time predicted in step S303 (step S304; Yes), the head-up display 2 executes switching to the simple display mode (step S305). In the simple display mode, the head-up display 2 displays guidance information regarding the next guidance point as a virtual image Iv. That is, in this case, the head-up display 2 determines that the hands-free call continues to the next guidance point, and makes the driver clearly see the minimum information necessary to pass the next guidance point.

On the other hand, when the average call time acquired in step S302 is equal to or shorter than the required time predicted in step S303 (step S304; No), the head-up display 2 determines whether the actual call time is longer than the required time predicted in step S303. It is determined whether or not (step S306). When the actual call time is longer than the required time predicted in step S303 (step S306; Yes), the head-up display 2 executes switching to the simple display mode (step S305). Thereby, even if it is a case where the actual call time becomes longer than the average call time acquired at step S302, the head-up display 2 suitably suppresses passing through the guidance point while in the normal display mode. In this case, the head-up display 2 considers that the actual call time is longer than the required time predicted in step S303 when the actual call time is longer than the average call time acquired in step S302. Switching to the simple display mode may be executed.

In addition, 2nd Embodiment and 3rd Embodiment can be combined suitably. In this case, even when the head-up display 2 is executing the normal display mode according to the flowchart of FIG. 10, if the head-up display 2 approaches the next guide point within a predetermined distance, the head-up display 2 is involved in the processing of the flowchart of FIG. First, switch to simple display mode. Thereby, the head up display 2 can suppress reliably passing a guidance point with normal display mode.

As described above, the head-up display 2 according to the present embodiment shifts to the simple display mode, which is a display mode for reducing the amount of information to be displayed as the virtual image Iv, when a call of the mobile phone 3 is detected. In the simple display mode, the head-up display 2 displays guidance information regarding the next guidance point as a virtual image Iv. According to this aspect, the head-up display 2 can suitably reduce the driver's load during the call of the mobile phone 3.

[Modification]
Hereinafter, modified examples suitable for the above-described embodiments will be described. The following modifications may be applied in any combination to the above-described embodiments.

(Modification 1)
Instead of the head-up display 2, the navigation device 1 may execute the determination of whether to execute the simple display mode or the normal display mode.

For example, the navigation device 1 determines whether to execute the simple display mode or the normal display mode based on the flowcharts of FIGS. 5, 9, and 10, and determines whether to execute the simple display mode or the normal display mode. May be transmitted to the head-up display 2. In this case, the head-up display 2 switches between the simple display mode and the normal display mode based on the instruction signal received from the navigation device 1.

In another example, the navigation device 1 generates an image signal of a display image to be output to the head-up display 2 based on the determination result after determining whether to execute the simple display mode or the normal display mode. The generated image signal may be supplied to the up display 2. In this case, the light source unit 4 of the head-up display 2 emits display light based on the image signal supplied from the navigation device 1 and displays the virtual image Iv. Even in these cases, the head-up display 2 can preferably switch between the display in the simple display mode and the display in the normal display mode. In this modification, the navigation device 1 is an example of an “information display device” in the present invention.

(Modification 2)
Instead of the head-up display 2, the display system 100 may include another display device (for example, a head-mounted display) that displays a virtual image superimposed on the scenery for the driver when the vehicle is driven. Even in this case, the display system 100 can suitably realize reduction in driving load and ensuring safety by simplifying the display under certain conditions during a hands-free call.

(Modification 3)
5, 9, and 10, the head-up display 2 determines that the driver's attention is directed to the mobile phone 3 even during a call even when the mobile phone 3 is in the outgoing or incoming call state. You may consider it as a hands-free call. For example, in step S101 of FIG. 5, the head-up display 2 determines that the hands-free call is in progress even when the mobile phone 3 is in the outgoing call state or the incoming call state, and executes the simple display mode. Thereby, reduction of the driving | running | working burden at the time of the incoming call or transmission of the mobile telephone 3 and ensuring of safety | security can be implement | achieved suitably.

DESCRIPTION OF SYMBOLS 1 Navigation apparatus 2 Head-up display 3 Mobile phone 4 Light source unit 7 Screen 8 Combiner 25 Front window 28 Bonnet 29 Dashboard 100 Display system

Claims

An information display device that reflects light constituting information and displays the information as a virtual image,
A detection unit for detecting a mobile phone call;
A display control unit that displays the information as a virtual image,
The display control unit reduces an amount of the information displayed as a virtual image when the detection unit detects a call of the mobile phone.
The information further includes an information generation unit that generates route guidance information as the information,
The information display apparatus according to claim 1, wherein the display control unit displays only at least a part of the guidance information when the detection unit detects a call of the mobile phone.
When the detection unit detects a call on the mobile phone, the display control unit may include a part or all of the information other than the guidance information for route guidance regarding a guidance point through which a user who views the virtual image passes next. The information display device according to claim 1, wherein the information display device is not displayed.
The display control unit, when the detection unit detects a call of the mobile phone, displays only guidance information for route guidance regarding a next guide point through which a user who visually recognizes the virtual image passes. Item 4. The information display device according to Item 2 or 3.
The display control unit detects the amount of the information when the detection unit detects a call of the mobile phone and a user who visually recognizes the virtual image approaches a guidance point that passes next within a predetermined distance. The information display device according to claim 3, wherein the information display device is reduced.
When the detection unit detects a call on the mobile phone, the prediction unit further includes a prediction unit that predicts whether or not the user who visually recognizes the virtual image is continuing the call at the time of passing the guidance point that passes next,
5. The information display according to claim 3, wherein the display control unit reduces the amount of the information when the prediction unit predicts that a call is continued when passing through the guide point. 6. apparatus.
Whether the prediction unit continues the call based on the history information of the call time with the other party of the mobile phone call detected by the detection unit and the expected time required to reach the guide point The information display device according to claim 6, wherein the information display device predicts the amount of information.
The display control unit detects the call of the mobile phone, and when a user who visually recognizes the virtual image approaches within a predetermined distance to a guide point that passes next, when the guide point passes. The information display device according to claim 6 or 7, wherein the amount of the information is reduced regardless of whether or not the prediction unit predicts that the call is continued.
The detection unit further detects the outgoing or incoming call of the mobile phone,
The display control unit according to any one of claims 1 to 8, wherein the display control unit reduces an amount of the information to be displayed as a virtual image when the detection unit detects an outgoing or incoming call of the mobile phone. Information display device.
A control method executed by an information display device that reflects light constituting information and displays the information as a virtual image,
A detection process for detecting mobile phone calls;
A display control step of reducing the amount of the information to be displayed as a virtual image when detecting a call of the mobile phone in the detection step;
A control method characterized by comprising:
A program executed by a computer of an information display device that reflects light constituting information and displays the information as a virtual image,
A detection unit for detecting a mobile phone call;
When the said detection part detects the telephone call of the said mobile telephone, the said computer is functioned as a display control part which reduces the quantity of the said information displayed as a virtual image.
A storage medium storing the program according to claim 11.