JP6976659B2 - Map display device and map display method - Google Patents

Description

The present invention relates to a map display device and a map display method, and is particularly suitable for use in a device and method for displaying road traffic information on the side of a road on a map image.

Generally, in a navigation device, a self-contained navigation sensor, a GPS (Global Positioning System) receiver, or the like is used to detect the current position of the vehicle, and map data in the vicinity thereof is read from a recording medium and displayed on the screen. Then, by superimposing and displaying the own vehicle position mark indicating the own vehicle position on the predetermined position on the screen, it is possible to know at a glance where the vehicle is currently traveling.

In addition, the navigation device can receive the road traffic information (VICS information: VICS is a registered trademark) sent from the road traffic information center and display the ever-changing road conditions on the navigation screen. There are many things. With this type of navigation device, it is possible to provide the user with road traffic information such as traffic congestion information and regulation information in real time.

There are three types of road traffic information: level 1 (character display type), level 2 (simple graphic display type), and level 3 (map display type). Of these, level 3 road traffic information includes traffic congestion information to indicate the type of congestion / congestion / smoothness, traffic regulation information to inform traffic closures, highway entrance closures, etc., and the occurrence of accidents, construction, broken cars, etc. Includes traffic jam information to inform.

When the navigation device receives the congestion information (congestion / congestion / smooth) of each link representing the road from the road traffic information center, the navigation device is based on the congestion information and is located on the side of the road corresponding to each link. A red traffic jam line indicating a congestion line and an orange traffic jam line indicating a congested area are blinked. In addition, a blue traffic jam line will be displayed on the side of the road where cars are flowing smoothly. Further, when the navigation device receives the traffic regulation information and the traffic obstacle information from the road traffic information center, the navigation device displays a predetermined icon at the place where the traffic regulation or the traffic obstacle occurs.

By the way, on the map, there is a section where the expressway and the general road run side by side. In such a parallel running section, when a traffic jam line or an icon is displayed on the side of the road, there is a problem that it is difficult to tell whether the displayed icon is an expressway or a general road.

On the other hand, conventionally, a navigation device is known in which a traffic jam line indicating a traffic jam on an expressway and a traffic jam line indicating a traffic jam on a general road are displayed in different display forms (shape, color, position, etc.). (See, for example, Patent Documents 1 to 3). In the navigation device described in Patent Document 1, the traffic jam information arrows overlap only partially by drawing the traffic jam information arrows in different colors while shifting the display position between the expressway and the general road. In this way, both are distinguishable.

In the navigation device described in Patent Document 2, the shape, color, and position of the arrow indicating the congestion of the expressway and the arrow indicating the congestion of the general road are different. In the navigation device described in Patent Document 3, the arrow of the general road is merely wide, and the arrow of the highway is the arrow of the general road and the arrow of the highway as a shaded arrow with a shadow added to the arrow of the general road. It is possible to distinguish between.

Japanese Unexamined Patent Publication No. 10-22648 Japanese Unexamined Patent Publication No. 2000-230837 Japanese Unexamined Patent Publication No. 2003-65778

However, in the method of changing the color of the congestion line between the expressway and the general road, there is a problem that it becomes difficult to understand which color indicates congestion / congestion / smoothness. That is, many navigation devices display traffic lines in red for traffic, orange for congestion, and blue for smooth, but the traffic lines are displayed in a different color (for example, green or purple). When displayed, there was a problem that it was difficult to intuitively understand whether it was congested / crowded / smooth.

Further, the method of changing the shape of the traffic jam line between the expressway and the general road causes the same problem as the method of changing the color. That is, there is a problem that it is difficult to intuitively understand which shape corresponds to either a highway or a general road.

Also, even if the color or shape of the congestion line is changed between the expressway and the general road, if both congestion lines are displayed overlapping, either the congestion line of the expressway or the congestion line of the general road is displayed. There was a problem that one was hidden behind the other and could not be confirmed. This problem also occurs in the display of icons indicating traffic regulation information and traffic obstacle information.

On the other hand, if the position of the traffic jam line or icon is changed between the expressway and the general road, the problem that the information of either the expressway or the general road is hidden behind the other information arises. No. However, it is not possible to know which position of the information corresponds to the expressway or the general road only by changing the display position. Therefore, it is necessary to use a method for distinguishing by color and shape together, but even if these are used together, as described above, the information on which color and shape corresponds to either the expressway or the general road. There was a problem that it was difficult to understand intuitively.

The present invention has been made to solve such a problem, and in a road section in which a plurality of roads run in parallel, the road traffic information for the plurality of roads is clearly distinguished and the user intuitively distinguishes the road traffic information. The purpose is to be able to provide an easy-to-understand display.

In order to solve the above-mentioned problems, in the present invention, the map is provided only when a parallel road exists in the map area to be displayed on the screen and road traffic information exists in the road section where the parallel road exists. The display screen is divided so that the road traffic information of the parallel road is displayed on each map display screen.

According to the present invention configured as described above, when road traffic information exists in a road section in which a plurality of roads run in parallel, the road traffic information of the parallel running roads is divided into separate map display screens. Since it is displayed, the road traffic information of each road constituting the parallel road can be clearly distinguished and grasped. In addition, it is not necessary to change the display form such as color, shape, and position for each of multiple roads to display the road traffic information, and the road traffic information can be displayed in a unified display form on any map display screen. It is possible to provide a display that is intuitively easy for the user to understand.

It is a block diagram which shows the functional structure example of the map display device by this embodiment. It is a figure which shows an example of the map display screen displayed by the display control unit of this embodiment. It is a flowchart which shows the operation example of the map display device by this embodiment. It is a figure which shows the other example of the map display screen displayed by the display control unit of this embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a functional configuration example of a map display device according to the present embodiment. In this embodiment, as an example of the map display device, a configuration example when a navigation device is used is shown. The navigation device may be an in-vehicle device or a navigation application installed and used on a mobile terminal such as a smartphone. In the following, a case where the navigation device is used in a vehicle will be described as an example.

As shown in FIG. 1, the map display device (navigation device) 100 of the present embodiment includes a map data acquisition unit 11, a map memory 12, a current position detection unit 13, a destination setting unit 14, a route search unit 15, and road traffic. It includes an information receiving unit 16, a display control unit 17, a parallel road presence / absence determination unit 18, and a road traffic information determination unit 19. The display control unit 17 has a map drawing unit 17A, a guidance route drawing unit 17B, and a road traffic information drawing unit 17C.

Each of the above functional blocks 11 to 19 can be configured by any of hardware, DSP (Digital Signal Processor), and software. For example, when configured by software, each of the above functional blocks 11 to 19 is actually configured to include a computer CPU, RAM, ROM, etc., and is a program stored in a recording medium such as RAM, ROM, a hard disk, or a semiconductor memory. Is realized by the operation of.

The map data acquisition unit 11 acquires map data from the map data storage unit 200. The map data storage unit 200 is composed of, for example, a storage medium such as a hard disk, a DVD (Digital Versatile Disk), or a semiconductor memory connected to or built in the map display device 100. Alternatively, the map data storage unit 200 may be an external storage in a server connected to the map display device 100 via a communication network such as the Internet.

The map data stored in the map data storage unit 200 is publicly known data used for map display, route search, etc., and includes information on nodes corresponding to points where a plurality of roads intersect, such as intersections and branches, and roads, lanes, and the like. Contains information about the corresponding link. That is, the map data includes a connection node table containing detailed data of all nodes and a link table containing detailed data of links specified by two adjacent nodes.

The connection node table contains information such as the normalized longitude / latitude of the node, the attribute flag, and the traffic regulation for each existing node. The normalized longitude / latitude indicates the relative position in the longitude / latitude direction with respect to a predetermined section. The attribute flag includes an intersection node flag indicating whether or not the node is an intersection node. The traffic regulation indicates the content of the traffic regulation when the link connected to the node has a traffic regulation such as a right turn prohibition or a U-turn prohibition.

In addition, the link table contains information such as link distance, link cost, road attribute flag, and road type flag. The distance of the link indicates the actual distance of the actual road corresponding to the link. The link cost is, for example, a weight value obtained by multiplying a predetermined constant according to the road width, road type, right / left turn, traffic regulation, etc. based on the distance, and quantifies the appropriate degree as a guidance route. .. The road attribute flag indicates various attributes related to the link. For example, an attribute indicating whether or not the link corresponds to a VICS link (link capable of receiving road traffic information) managed by the road traffic information center is included. The road type flag indicates the actual road type (expressway, national road, prefectural road, narrow street, etc.) corresponding to the link.

The current position detection unit 13 detects the current position of the vehicle at predetermined intervals, and is composed of a self-contained navigation sensor, a GPS receiver, a position calculation CPU, and the like. The self-contained navigation sensor is a vehicle speed sensor (distance sensor) that outputs one pulse for each predetermined mileage to detect the moving distance of the vehicle, and an angular velocity sensor such as a vibration gyro that detects the rotation angle (moving direction) of the vehicle. (Relative orientation sensor) and included. The self-contained navigation sensor detects the relative position and direction of the vehicle by these vehicle speed sensors and angular velocity sensors.

The position calculation CPU calculates an absolute own vehicle device (estimated vehicle position) and vehicle orientation based on the relative position and orientation data of the own vehicle output from the self-contained navigation sensor. In addition, the GPS receiver receives radio waves transmitted from a plurality of GPS satellites with GPS antennas and performs three-dimensional positioning processing or two-dimensional positioning processing to calculate the absolute position and orientation of the vehicle (vehicle orientation is , Calculated based on the current vehicle position and the vehicle position one sampling time ΔT before).

The map data acquisition unit 11 described above inputs the current position information from the current position detection unit 13 and outputs a read instruction of map data in a predetermined range including the current position to map the map data necessary for map display. It is acquired from the data storage unit 200 and stored in the map memory 12. Further, when the map data acquisition unit 11 searches for the guidance route, the current position detection unit 13 inputs the current position information, and the destination setting unit 14 inputs the destination information, and the current position and the destination. By outputting the reading instruction of the map data in a predetermined range including the above, the map data necessary for the route search is acquired from the map data storage unit 200 and stored in the map memory 12.

The map drawing unit 17A of the display control unit 17 draws a map image necessary for displaying the map around the current position on the display device 300 based on the map data stored in the map memory 12. At this time, the map drawing unit 17A generates vehicle position marks and various landmarks indicating the position of the own vehicle, and generates a map image necessary for displaying these various marks together with the map.

The destination setting unit 14 sets the destination of the guidance route based on the user's operation. The route search unit 15 searches for a guidance route from the current location to the destination under the set search conditions using the map data stored in the map memory 12. The guidance route drawing unit 17B of the display control unit 17 draws the guidance route based on the data of the guidance route searched by the route search unit 15. Specifically, the guidance route is drawn thicker in a different color from other roads. Further, when the vehicle approaches the guide intersection on the guidance route within a certain distance, an enlarged view of the intersection is drawn.

The road traffic information receiving unit 16 receives the road traffic information sent from the road traffic information center. Specifically, the road traffic information receiving unit 16 performs two-way communication via radio waves mainly with a radio beacon transmitter / receiver installed on a highway, and is mainly installed on a general road. By performing two-way communication with the optical beacon transmitter / receiver via radio waves, the road traffic information sent from the road traffic information center is received. Further, the road traffic information receiving unit 16 receives the road traffic information transmitted from the road traffic information center via the FM broadcast radio wave. The road traffic information received by the road traffic information receiving unit 16 includes at least one of level 3 traffic jam information, traffic regulation information, and traffic obstacle information.

Based on the road traffic information received by the road traffic information receiving unit 16, the road traffic information drawing unit 17C of the display control unit 17 causes a congestion line indicating the degree of congestion in different colors, traffic regulation, and traffic obstacles. A predetermined icon indicating the location is drawn on the side of the road corresponding to each link. Specifically, when the road traffic information receiving unit 16 receives the congestion information (congestion / congestion / smooth) of each link from the road traffic information center, the road traffic information drawing unit 17C is based on the congestion information. , Draw either a red traffic line indicating a traffic jam, an orange traffic line indicating a congested area, or a blue traffic line indicating that cars are flowing smoothly on the side of the road corresponding to each link. .. Further, when the road traffic information receiving unit 16 receives the traffic regulation information and the traffic obstacle information from the road traffic information center, the road traffic information drawing unit 17C causes the traffic regulation and the traffic obstacle on the side of the road corresponding to each link. Draw a predetermined icon in the place where it is.

Based on the map data stored in the map memory 12, the parallel road presence / absence determination unit 18 approaches each other within a predetermined distance into the map area to be displayed on the screen of the display device 300 by the map drawing unit 17A. It is determined whether or not there are a plurality of roads (parallel running roads) running in parallel. A typical example of a parallel road is one in which one is an expressway and is an elevated road, and the other is a general road and is an elevated road. In this case, the expressway and the general road almost overlap on the two-dimensional map data, and it can be said that they are a plurality of roads that are close to each other within a predetermined distance. Not only when the expressway and the general road run side by side above and below the elevated road, but also when they run side by side in the horizontal position, the parallel roads that are close to each other within a predetermined distance and run side by side. be.

In addition, the combination of national roads and bypasses in local cities, the combination of urban highways and general road ring roads in urban areas, the combination of national roads and local roads, the combination of local roads and narrow streets, and highways (For example, the Metropolitan Expressway and the Ken-O Expressway), the combination of the surface road and the underpass (or tunnel), etc. may be parallel roads that are close to each other within a predetermined distance. In addition, the "predetermined distance" here means each road so that it becomes difficult to understand at first glance which road the road traffic information is when the road traffic information is displayed on the side of the parallel road. Is a value indicating that is approaching.

When the road traffic information determination unit 19 determines that the parallel road exists by the parallel road existence determination unit 18, the road traffic information exists in the road section where the parallel road exists (hereinafter referred to as the parallel road section). Judge whether or not. That is, the road traffic information determination unit 19 determines whether or not the road traffic information regarding at least one of the roads constituting the parallel running road is received by the road traffic information receiving unit 16 in the parallel running section. VICS link information (link coordinates, distance from the link end) indicating the location of occurrence is attached to the traffic congestion information, traffic regulation information, and traffic obstacle information. The road traffic information determination unit 19 associates this VICS link information with the road link information possessed by the map data, and determines whether or not the road traffic information indicated by the VICS link exists in the parallel running section indicated by the road link. To judge.

When the road traffic information determination unit 19 determines that the road traffic information exists in the parallel running section, the display control unit 17 divides the map display screen and displays the road traffic information of each road constituting the parallel running road on each map. Control to display on the display screen. For example, the display control unit 17 divides the map display screen of the display device 300 into two screens on the left and right, displays road traffic information on one of the parallel roads on the map display screen on the left side, and relates to the other road. Controls to display road traffic information on the map display screen on the right side.

FIG. 2 is a diagram showing an example of a map display screen displayed by the display control unit 17. FIG. 2A shows a map display screen in a normal state of the display device 300. When it is determined by the parallel road existence determination unit 18 that the parallel road does not exist in the map area to be displayed on the screen for the display device 300, and when the parallel road exists but the parallel road section exists. When the road traffic information determination unit 19 determines that the road traffic information does not exist, the display control unit 17 displays a map on the entire screen as shown in FIG. 2A, and displays the map on the side of the road on the map. Display road traffic information. FIG. 2A shows a display example when there is no parallel road in the map area to be displayed on the screen.

On the other hand, if a parallel road exists in the map area to be displayed on the screen of the display device 300, the parallel road existence determination unit 18 determines, and road traffic information (of the parallel roads) is determined in the parallel section. When the road traffic information determination unit 19 determines that there is at least one road traffic information), the display control unit 17 divides the map display screen into two left and right, as shown in FIG. 2 (b). The same map is displayed on the map display screen, and the road traffic information of each road constituting the parallel road is controlled to be displayed separately on each map display screen.

In the example of FIG. 2B, for the map area including the road section where the general road and the expressway run side by side, the road traffic information of the general road currently running is displayed on the map display screen on the left side. The state where the road traffic information of the expressway running in parallel with the general road is displayed on the map display screen on the right side is shown. By doing so, when road traffic information exists in a parallel running section in which a plurality of roads run in parallel, the road traffic information of the plurality of roads is displayed separately on a separate map display screen. It is possible to clearly distinguish and grasp the road traffic information of each road. As shown in Fig. 2 (b), if it is decided to display the road traffic information on the road currently being driven on the map display screen on the left side, the road traffic information on the road currently being driven and the vicinity thereof will be run in parallel. It is possible to grasp at a glance the road traffic information related to the road.

In addition, if it is displayed as shown in Fig. 2 (b), it is not necessary to change the display form such as color, shape, position, etc. for each road of parallel roads to display road traffic information, and it is unified on any map display screen. Road traffic information can be displayed in the displayed format. That is, if the congestion line indicates the degree of congestion by different colors, the congestion line may be displayed in red on either the left or right map display screen, orange in the congested area, and blue in the smooth area. Further, if the icon indicates a place where traffic regulation or traffic obstacle occurs, the same icon may be displayed on either the left or right map display screen according to the content of the traffic regulation or traffic obstacle. As a result, it is possible to eliminate the complexity of showing the same road traffic information but having different display forms, and to provide a display that is intuitively easy for the user to understand.

FIG. 3 is a flowchart showing an operation example of the map display device 100 according to the present embodiment configured as described above. The flowchart shown in FIG. 3 starts when the power of the map display device 100 is turned on.

First, the road traffic information receiving unit 16 receives road traffic information from the road traffic information center (step S1). Further, the current position detection unit 13 detects the current position of the vehicle (step S2). Next, the map data acquisition unit 11 inputs the current position information from the current position detection unit 13, acquires map data in a predetermined range including the current position from the map data storage unit 200, and stores it in the map memory 12 (step). S3).

Then, the parallel road existence determination unit 18 determines whether or not the parallel road exists in the map area to be displayed on the screen of the display device 300 based on the map data stored in the map memory 12. (Step S4). When the parallel road does not exist, the display control unit 17 displays the map on the entire screen as shown in FIG. 2A, and is received by the road traffic information receiving unit 16 on the side of the road on the map. Display the road traffic information (step S7).

On the other hand, when the parallel road existence determination unit 18 determines that the parallel road exists in the map area to be displayed on the screen, the road traffic information determination unit 19 determines whether the road traffic information exists in the parallel road section. It is determined whether or not (step S5). Here, when it is determined that the road traffic information does not exist in the parallel running section, the display control unit 17 causes the map to be displayed on the entire screen as shown in FIG. 2A, and is on the side of the road on the map. , The road traffic information received by the road traffic information receiving unit 16 is displayed (step S7).

On the other hand, when it is determined that the road traffic information exists in the parallel running section, the display control unit 17 divides the map display screen of the display device 300 into two left and right screens as shown in FIG. 2B, and runs in parallel. The road traffic information on one of the roads is displayed on the map display screen on the left side, and the road traffic information on the other road is displayed on the map display screen on the right side (step S6).

After performing the display according to step S6 or step S7, the map display device 100 determines whether or not the power is turned off (step S8). If the power is not turned off, the process returns to step S1. On the other hand, when the power is turned off, the processing of the flowchart shown in FIG. 3 ends. In the flowchart of FIG. 3, the road traffic information reception process (step S1) and the map data acquisition process based on the current position (steps S2 and S3) are performed in one loop. They may be performed separately at asynchronous timing.

As described in detail above, in the present embodiment, when a parallel running road exists in the map area to be displayed on the screen and road traffic information exists in the parallel running section, the map display screen is divided and parallel running is performed. The road traffic information of each road constituting the road is displayed on each map display screen.

According to the present embodiment configured in this way, when road traffic information exists in a parallel running section in which a plurality of roads run in parallel, the road traffic information of the plurality of roads is divided into separate map display screens. It is possible to clearly distinguish and grasp the road traffic information of a plurality of roads. In addition, it is not necessary to change the display form for each of multiple roads to display the road traffic information, and the road traffic information can be displayed in a unified display form on any map display screen, so it is easy for the user to intuitively understand. A display can be provided.

In the above embodiment, when road traffic information exists in the parallel running section, the road traffic information of each road constituting the parallel running road is displayed on a plurality of map display screens without considering other conditions. Although the display is performed separately, the present invention is not limited to this. A modified example of this embodiment will be described below.

<Modification 1>
For example, the road traffic information determination unit 19 determines whether or not there is congestion information having a different degree of congestion for each of the roads constituting the parallel road. Then, when the road traffic information determination unit 19 determines that congestion information having a different degree of congestion exists for each road in the parallel traveling section, the display control unit 17 determines that each road constituting the parallel traveling road has congestion information. Road traffic information may be displayed separately on each map display screen.

By doing so, even if the traffic jam information exists only on one of the roads constituting the parallel road, or even if the traffic jam information exists for each of the roads, the traffic jam information has the same degree of traffic jam. In this case, as in FIG. 2A, the map is displayed on the entire screen, and the traffic jam line is displayed on the side of the road on the map. On the other hand, when congestion information with different degrees of congestion is received for each road constituting the parallel road, the congestion lines related to the plurality of roads are divided into a plurality of map display screens as shown in FIG. 2 (b). Is displayed. As a result, it is possible to display the congestion line on a plurality of screens only when the congestion degree of each road constituting the parallel road is different and it is necessary to clearly distinguish and grasp it. On the other hand, if the traffic line is displayed on only one screen even if it is divided into multiple screens, or if the traffic lines of the same color are displayed on both screens, it is possible to display a large map on one screen. can.

<Modification 2>
Further, as yet another example with respect to the modified example 1, the road traffic information determination unit 19 further determines whether or not the distance of the road section in which the congestion information having a different degree of congestion exists is equal to or more than a predetermined value. Then, it is determined that the road traffic information is determined that the distance of the road section in which the traffic jam information having a different traffic jam degree exists for each road in the parallel running section and the traffic jam information having the different traffic jam degree exists is equal to or more than a predetermined value. When the determination is made by the unit 19, the display control unit 17 may display the road traffic information of each road constituting the parallel road separately on each map display screen.

By doing so, even if congestion information having a different degree of congestion is received for each road constituting the parallel road, if the distance of the road section is not equal to or more than a predetermined value, as in FIG. 2A, A map is displayed on the entire screen, and a traffic jam line is displayed on the side of the road on the map. That is, as shown in FIG. 2B, the congestion lines related to a plurality of roads are displayed on a plurality of map display screens only when the distance of the road section in which the congestion information having different degrees of congestion exists for the parallel roads is equal to or more than a predetermined value. It is displayed separately. As a result, if the distance between road sections with different levels of congestion is shorter than the specified value and there is no significant difference in driving regardless of the degree of congestion, a large map can be displayed on one screen. Can be.

<Modification 3>
Further, as another example, the road traffic information determination unit 19 determines whether or not traffic regulation information or traffic obstacle information exists for at least one of the roads constituting the parallel road. Then, when the road traffic information determination unit 19 determines that traffic regulation information or traffic obstacle information exists on at least one of the roads in the parallel running section, the display control unit 17 determines each road constituting the parallel running road. The road traffic information may be displayed separately on each map display screen.

In this way, if there is no traffic regulation information or traffic obstacle information on any of the roads constituting the parallel road, the map is displayed on the entire screen as in FIG. 2A. On the other hand, if traffic regulation information or traffic obstacle information exists on at least one of the roads constituting the parallel road, as shown in FIG. 2B, there are a plurality of traffic regulation and traffic obstacle icons related to the plurality of roads. It is displayed separately on the map display screen of. This allows the icons to be split into multiple screens only when there are traffic restrictions or obstacles on parallel roads and it is necessary to clearly distinguish and understand which of the roads they belong to. It can be displayed, and if there are no traffic restrictions or traffic obstacles, it is possible to display a large map on one screen.

<Modification example 4>
Further, as another example, in the road traffic information determination unit 19, whether or not traffic regulation information or traffic obstacle information exists on each road constituting the parallel road, and if so, the number or density of existence (for example). , The number of existence per unit distance) is determined whether or not it is equal to or more than a predetermined value. Then, when the road traffic information determination unit 19 determines that the traffic regulation information or the traffic obstacle information exists on each road constituting the parallel road and the existence number or the existence density thereof is equal to or more than a predetermined value. The display control unit 17 may display the road traffic information related to each road constituting the parallel road separately on each map display screen.

In this way, if traffic regulation information or traffic obstacle information is received for each road constituting the parallel road and the number or density of the traffic is not equal to or more than a predetermined value, FIG. 2 (a) shows. Similarly, a map is displayed on the entire screen, and an icon is displayed on the side of the road on the map. That is, as shown in FIG. 2B, a plurality of roads are present only when traffic regulation information or traffic obstacle information exists for each road constituting the parallel road and the existence number or density thereof is equal to or more than a predetermined value. The icon related to is displayed separately on multiple map display screens. As a result, when traffic regulation or traffic obstacle icons related to multiple roads are displayed on one screen, the icons are displayed on multiple screens only when they are crowded and difficult to distinguish, and in other cases, the icons are displayed. It is possible to display a large map on one screen.

<Modification 5>
Either the above-mentioned modification 1 or the above-mentioned modification 2 may be combined with any of the above-mentioned modification 3 or the above-mentioned modification 4 to be carried out. In this case, road traffic related to multiple roads when both the condition for displaying the traffic jam line on multiple screens and the condition for displaying the traffic regulation or traffic obstacle icon on multiple screens are satisfied. Information can be displayed separately on a plurality of map display screens, and in other cases, the map can be displayed in a large size with one screen as it is.

<Modification 6>
Further, as another example, the road traffic information determination unit 19 determines whether or not road traffic information exists for a road other than the road currently in progress among the roads constituting the parallel running road. Then, when the road traffic information determination unit 19 determines that road traffic information exists for a road other than the road currently in progress in the parallel traveling section, the display control unit 17 constitutes each of the parallel traveling roads. The road traffic information of the road may be displayed separately on each map display screen.

In this way, even if road traffic information exists in the parallel running section, the road traffic information must exist only on the road currently in progress among the parallel running roads, and the road traffic information must exist on the other roads. For example, as in FIG. 2A, a map is displayed on the entire screen, and a traffic jam line or an icon is displayed on the side of the road on the map. On the other hand, if road traffic information exists on a parallel road other than the road currently in progress (including both the case where the road traffic information exists and the case where the road traffic information does not exist on the road currently in progress), FIG. As shown in (b), road traffic information related to a plurality of roads is displayed separately on a plurality of map display screens. As a result, only when road traffic information exists on other roads running in parallel with the road currently in progress, the road traffic information is displayed on multiple screens so that it can be clearly distinguished, and other than that. In the case of, it is possible to display a large map on one screen.

<Modification 7>
Further, as another example, the road traffic information determination unit 19 determines whether or not road traffic information exists for a road that is currently in progress and has a guidance route set among parallel roads. Then, in the parallel running section, it is determined by the road traffic information determination unit 19 that the road traffic information exists for the road that is currently in progress and the guidance route is set, and the road that is not currently in progress among the parallel running roads. On the other hand, when the route search unit 15 resets the guidance route, the display control unit 17 may display the road traffic information of each road constituting the parallel road separately on each map display screen. ..

In this modification 7, if a traffic jam, traffic regulation, or a traffic obstacle occurs at a position in front of the traveling direction while traveling along the guidance route set by the route search unit 15, the route search unit 15 causes the traffic jam. It automatically searches for another guidance route (detour route) that avoids traffic restrictions, traffic restrictions, and places where traffic obstacles occur. Here, the road traffic information determination unit 19 determines whether or not the place where traffic congestion, traffic regulation, or traffic obstacle occurs is a place on a parallel road that is currently in progress and a guidance route is set. Further, the route search unit 15 determines whether or not the detour route set by the re-search is a parallel road that is not currently in progress.

Then, the road traffic information determination unit 19 determines that the road traffic information exists for the road that is currently in progress and the guidance route is set, and the detour route for the road that is not currently in progress among the parallel running roads is searched. When the route search unit 15 determines that the road has been completed, the display control unit 17 displays the road traffic information of each road constituting the parallel road separately on each map display screen.

In this way, on one map display screen, road traffic information regarding the road currently in progress where congestion, traffic regulation or traffic obstruction has occurred is displayed, and on the other map display screen, congestion, traffic regulation is displayed. Alternatively, it is possible to display road traffic information on other roads that do not have traffic obstacles (or have a low degree of congestion). As a result, the grounds for recommending switching from the currently ongoing guidance route to the detour route can be divided into a plurality of map display screens and presented in an easy-to-understand manner.

In addition, in this modification 7, not only the map area around the current position displayed on the screen, but also when a traffic jam or the like occurs on the guidance route ahead of the map area, the same processing as above is performed. May be done. In this case, as shown in FIG. 4, the display control unit 17 divides the display device 300 into three, displays a map around the current position on the map display screen on the left side, and displays the upper and lower map display screens on the right side. Display a map of the place where traffic jams are occurring.

At this time, a pop-up image guiding the detour route is displayed on the map display screen on the left side. In addition, the map display screen on the upper right side displays road traffic information related to the road currently in progress due to traffic congestion, etc., and the map display screen on the lower right side displays roads other than the road currently in progress. Display road traffic information. In the case of this example, the map area corresponding to the place where traffic congestion occurs on the guidance route, that is, the map area to be displayed on the map display screens on the upper and lower right sides is the "map area to be displayed on the screen" in the claims. Is equivalent to.

Further, in the above embodiment, an example in which road traffic information is displayed separately on two map display screens when two roads run in parallel has been described, but when three or more roads run in parallel, the example has been described. Road traffic information may be displayed on three or more map display screens.

Further, in the above embodiment, an example in which the entire screen of the display device 300 is divided into left and right is described, but the present invention is not limited to this. For example, it may be divided into upper and lower parts. Alternatively, the size may be displayed in a time-division manner while maintaining the size of the entire screen.

In addition, the above embodiments are merely examples of the embodiment of the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from its gist or its main features.

11 Map data acquisition unit 12 Map memory 13 Current position detection unit 14 Destination setting unit 15 Route search unit 16 Road traffic information reception unit 17 Display control unit 18 Parallel road existence determination unit 19 Road traffic information determination unit 100 Map display device ( Navigation device)

Claims (8)

It is a map display device that displays road traffic information on the side of the road on the map image.
In the map area to be displayed on the screen, there is a parallel road existence determination unit that determines whether or not there are parallel roads that are multiple roads that are close to each other within a predetermined distance and run in parallel.
When the existence of the parallel road is determined by the parallel road existence determination unit, the road traffic information determination unit for determining whether or not the road traffic information exists in the road section where the parallel road exists, and the road traffic information determination unit.
Only when it is determined by the road traffic information determination unit that road traffic information exists in the road section of the parallel road, the map display screen is divided and the road traffic information of each road constituting the parallel road is displayed. A map display device equipped with a display control unit that controls display on a map display screen. When the road traffic information determination unit determines that the parallel road exists by the parallel road existence determination unit , the road traffic information determination unit constitutes the parallel road as the road traffic information in the road section where the parallel road exists. It is determined whether or not there is congestion information with a different degree of congestion for each of the roads to be used.
The display control unit divides the map display screen only when the road traffic information determination unit determines that congestion information having a different degree of congestion exists for each road in the road section of the parallel road. Te, map display device according to claim 1, the road traffic information of each road constituting the parallel running road, characterized in that controls to display on each map display screen. The road traffic information determination unit further determines whether or not the distance of the road section in which the congestion information having a different degree of congestion exists is equal to or greater than a predetermined value.
The display control unit determines the distance of the road section in which the traffic jam information having a different degree of congestion exists for each road in the road section of the parallel road and the traffic jam information having a different degree of congestion exists. Only when it is determined by the road traffic information determination unit that the value is equal to or higher than the value , the map display screen is divided and the road traffic information of each road constituting the parallel road is displayed on each map display screen. The map display device according to claim 2, wherein the map display device is controlled. When the road traffic information determination unit determines that the parallel road exists by the parallel road existence determination unit , the road traffic information determination unit constitutes the parallel road as the road traffic information in the road section where the parallel road exists. Determine if traffic regulation information or traffic obstacle information exists for at least one of the roads to be used.
The display control unit displays a map only when the road traffic information determination unit determines that the traffic regulation information or the traffic obstacle information exists for at least one of the roads in the road section of the parallel road. The map according to any one of claims 1 to 3, wherein the screen is divided and the road traffic information of each road constituting the parallel road is controlled to be displayed on each of the map display screens. Display device. The road traffic information determination unit determines whether or not the traffic regulation information or the traffic obstacle information exists for each of the roads constituting the parallel road, and the number or density of the existence if the information exists. Judge whether it is above the specified value and
The display control unit determines that the traffic regulation information or the traffic obstacle information exists for each of the roads constituting the parallel road, and the number or density of the traffic regulation information is equal to or more than a predetermined value. Only when it is determined by the traffic information determination unit , the map display screen is divided and the road traffic information of each road constituting the parallel road is controlled to be displayed on each of the map display screens. The map display device according to claim 4. When the road traffic information determination unit determines that the parallel road exists by the parallel road existence determination unit, the road traffic information is transmitted to a road other than the currently ongoing road among the parallel roads. Determine if it exists and
The display control unit displays a map only when the road traffic information determination unit determines that the road traffic information exists for a road other than the road currently in progress in the road section of the parallel road. The map display device according to claim 1, wherein the screen is divided and the road traffic information of each road constituting the parallel road is controlled to be displayed on each of the map display screens. When the road traffic information determination unit determines that the parallel road exists by the parallel road existence determination unit, the road is the road with respect to the road currently in progress and the guidance route is set among the parallel roads. Determine if traffic information exists and
The display control unit determines by the road traffic information determination unit that the road traffic information exists for the road currently in progress and for which the guidance route is set in the road section of the parallel road, and Only when resetting the guidance route for a road that is not currently in progress among the parallel roads , the map display screen is divided and the road traffic information of each road constituting the parallel road is displayed on each map. The map display device according to claim 1, wherein the map display device is controlled so as to be displayed on a screen. It is a map display method that displays road traffic information on the side of the road on the map image.
The parallel road existence determination unit of the map display device determines whether or not there are parallel roads that are multiple roads running in parallel within a predetermined distance from each other in the map area to be displayed on the screen. The first step to determine and
When it is determined by the parallel road existence determination unit that the parallel road exists, the road traffic information determination unit of the map display device determines whether the road traffic information exists in the road section where the parallel road exists. The second step to determine whether
Only when it is determined by the road traffic information determination unit that road traffic information exists in the road section of the parallel road, the display control unit of the map display device divides the map display screen and displays the parallel road. A map display method comprising a third step of controlling the road traffic information of each of the constituent roads to be displayed on each map display screen.

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