JP2001133272A - Navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid screen indication change operation having been required in conventional navigation device such as changing from two screen indication to one screen indication street, or from wide region map indication to detailed map indication or in the case of progressing from wide road to narrow street during running or reducing speed from high to low speed running, and to avoid a hindrance to driving. SOLUTION: When car velocity decrease below a specific value is detected by the signal from a car velocity sensor in a car running state detector 122, or progressing of car into narrow road is detected with a narrow road progressing detector 128, more proper indication of screen number and screen fraction for the car running state is set such that a map screen forming part 145 in an indication screen number/screen fraction setting part 144 changes a two screen indication to one screen indication with more detailed map or from wide region map indication of large screen to mare detailed map indication on a large screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device mounted on a vehicle or the like, and more particularly to a navigation device capable of variously changing a map display form of an image display device for displaying various information such as a map. About.

[0002]

2. Description of the Related Art In a navigation apparatus, a map data storage device such as a DVD-ROM storing a large amount of map data, a display device, a GPS, a gyro, a vehicle speed sensor and the like are used to detect a current position and a current direction of the vehicle. It has a movement detection device and the like, reads out the map data according to the current position of the vehicle or the display instruction from the map data storage device, draws a map image on a display screen based on the map data, and displays the vehicle position such as an arrow. Marks (location cursors) are superimposed on the display screen and displayed, and the map image is scrolled according to the movement of the vehicle, or the map image is fixed on the screen and the vehicle position mark is scrolled to display where the vehicle is currently You can see at a glance if you are running.

[0003] Conventionally, in-vehicle navigation devices have been equipped with a route guidance function that allows a user to easily travel to a desired destination without making a mistake on a road. In this route guidance function, the lowest cost guidance route from the starting point to the destination is automatically searched for by using simulation data such as the horizontal search method or the Dijkstra method using the map data, and the searched route is referred to as the guidance route. During driving, the guidance route is drawn on the map image with a different color from the other roads and displayed thicker, or displayed on the screen, or within a certain distance from the intersection where the vehicle should change the route on the guidance route. When the vehicle approaches, the user is guided to the destination by enlarging and displaying the intersection where the course should be changed and drawing and displaying an arrow indicating the direction in which the course should be changed.

In the navigation apparatus, a map near the position of the vehicle is drawn on the display screen as described above, and a guidance route is superimposed on the map, and the map is displayed with the movement of the vehicle located at the center of the screen. The screen is scrolled so that the user can always run while checking the position of the vehicle and the surrounding conditions.However, the screen has become larger and wider due to the recent development of liquid crystal displays. The screen to the left and right by using
The navigation device is divided and displays various information in various modes on both screens, thereby providing a highly convenient navigation device. In a navigation device, a map is the most important display element among various information displays, and various studies have been made on how to display a map easily on a screen divided into two as described above. It has been done.

[0005] As a method of dividing the wide screen into two and displaying the map in an easy-to-view manner, for example, a map centering on the position of the vehicle is usually displayed on the entire screen, and when the vehicle is near an intersection where a right or left turn is to be made, one screen is displayed. , A small map centering on the position of the own vehicle is displayed, and an enlarged view of the intersection and various information relating to the intersection are displayed on the screen on the other side. With such a display method, in the case of the conventional display of only one screen, it is possible to prevent the surrounding map from being understood at the time of guidance of an intersection, thereby preventing the driver from being oblivious to driving. Normally, a map is displayed on one screen, and when searching for surrounding facility information during this display, the screen is divided into two, and the operation screen and the search display screen are displayed on one side, and the other side is displayed. Some people continue to display small maps.

[0006] Further, according to the selection switching operation of the user, one screen displays a plane map with the vehicle traveling direction centered on the own vehicle position, and the other screen displays a map by a bird's eye view or the like, and There is also one that performs 3D display.
Furthermore, by displaying a wide-area map on one screen, it is easy to see where the vehicle position is located on the entire map, while on the other screen the vicinity of the vehicle position is displayed. By displaying a detailed map, roads, facilities, and the like near the own vehicle position are also displayed in an easy-to-understand manner. At this time, a more easily understandable map display is performed by appropriately adopting a bird's-eye view method, a 3D display method, or the like for each wide area map screen or detailed map screen.

[0007]

As described above, in response to the widening of the display in the on-vehicle navigation device, the user can perform a selection switching operation as necessary.
A screen is displayed and various types of maps are displayed on each screen. As one mode, a map display of one screen and a map display of two screens are switched by a user's selection switching operation. In the case of map display on the screen,
A wide-area map is displayed on one screen, and a detailed map is displayed on the other screen.

In such a screen display form, for example, from a state in which a wide screen map of one screen is displayed due to driving on a national road for a long time, a user enters a narrow road in the city from the national road. Assuming that the map display of the narrow street is omitted in the display state of the wide area map, it is preferable to switch to a detailed map in which the narrow street is also displayed when the narrow street in the city is entered. In such a case,
In the conventional device, the user needs to perform a map display switching operation from the wide area map screen to the detailed map screen which can also display narrow streets. When a wide-area map is displayed on one screen and a detailed map is displayed on the other screen as a form of two-screen display, a wide-area / detailed map parallel display form in two-screen display is further selected and operated. There is a need.

Conversely, while traveling on a narrow street, a state in which a wide area and detailed map are displayed side by side on a two-screen display, a large road such as a national road is entered. Is unnecessary, and a one-screen wide-area map display may be preferable. In such a case, it is necessary for the user to switch from the two-screen display to the one-screen display and perform a selection switching operation on the screen for the wide-area map display.

For example, when traveling along a guidance route, when the destination is sufficiently far, or when traveling on a relatively wide road, which is sufficiently far from the intersection where a right / left turn is to be made, etc. Generally, the traveling speed of a car is high, and it is preferable to mainly display a wide area map in such a traveling state. Conversely, when approaching a destination or approaching a left-right turn intersection, or when traveling on a narrow street, the traveling speed of a car is often slow, and in such a case, the details are mainly detailed. It is preferable to display a map. In the selection of the screen display in each driving state as described above, in the conventional device, it is necessary for the user to perform the selection switching operation by determining whether the wide area map needs to be constantly displayed or the detailed map needs to be displayed. Was troublesome.

On the other hand, when the wide area map and the detailed map are displayed on both screens in the conventional two-screen split display, the ratio of the left and right screens is usually the same, and the size of the left and right screens is Are adopted, the two maps are displayed with equal weight. Therefore, when a large-area map is mainly displayed and a detailed map in the vicinity can be displayed on a small screen because it may be displayed on the small screen, or conversely, a wide-area map is displayed on a small screen while mainly displaying the detailed map. At times, the above display format has not been able to meet the demand.

To cope with this, it has been proposed to increase the size of the screen on one side and reduce the size of the screen on the other side to display different maps for the two-screen split display. However, even in this case, the form of the map displayed on each screen does not change unless the user changes the display. Therefore, the conventional 2
The display of the map screen by the screen division method is not always displayed in a manner according to the user's intention, and the user needs to frequently change the display according to the traveling state of the vehicle.
Therefore, such a manual switching operation is troublesome, and it is not preferable that the driver performs these operations from the viewpoint of safe driving.

Therefore, the present invention automatically changes the two-screen display to one screen according to the running state of the vehicle, for example, whether or not the vehicle has entered a narrow street or whether or not the running speed has become lower than a predetermined speed. It is possible to switch to display or change the ratio of the size of each screen in multiple screen split display, there is no need to manually change the screen display, and there is no hindrance to driving due to the change operation It is a main object to provide such a navigation device.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a vehicle running state detecting section for detecting various running states of a vehicle, A display screen setting unit that sets the number of display screens or a screen ratio of a plurality of screens according to a signal; and a map screen forming unit that forms a map screen to be displayed on an image display device according to a signal from the display screen setting unit. The display screen setting unit is a navigation apparatus characterized in that the number of map screens to be displayed on the image display device or the screen ratio of a plurality of screens is set in accordance with a traveling state.

Further, the invention according to a second aspect is characterized in that the vehicle running state detecting section includes a narrow street running detecting section for detecting whether or not the vehicle is running on a narrow street, and a display screen when a narrow street running is detected. 2. The navigation device according to claim 1, wherein the setting unit sets one screen display of a map including the narrow street or a screen display that displays the map including the narrow street at a screen ratio larger than other maps. .

According to a third aspect of the present invention, the vehicle running state detecting section detects whether the vehicle speed is equal to or lower than a predetermined value, and when the vehicle speed is equal to or lower than the predetermined value, the display screen setting section includes:
2. The navigation device according to claim 1, wherein the screen is set to a one-screen display of the detailed map or a screen display in which the detailed map is displayed at a screen ratio larger than the wide area map.

[0017]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of a navigation control device 100 embodying the present invention.
The GPS receiver 102 processes the signal received from the satellite from the GPS receiver 102, and stores the vehicle position data based on the signal from the satellite in the data storage unit 103. On the other hand, an angle sensor 104 provided in the vehicle for detecting a traveling direction of the vehicle, and a distance sensor 1
The signal from the self-contained navigation sensor 106 composed of the self-contained navigation sensor 105 is input to the vehicle position / azimuth calculation unit 107 to obtain position data from the self-contained navigation sensor.

The vehicle position signal generator 108 corrects the vehicle position data by GPS in the data storage 103 with the position data in the vehicle position / azimuth detector 107 to obtain accurate vehicle position data. The vehicle position signal obtained by the vehicle position signal generating unit 108 is output to various functional units in the navigation control device 100 to be described later via the vehicle position data line 109 and used by each unit.

Remote control 1 attached to navigation device
10, a touch panel 111 provided on a display,
In addition, user operation signals from various operation switches 112 are input to the operation signal input unit 113. The signal is output to various functional units in the navigation control device 100 via the operation signal data line 114, and is used as a user's instruction signal.

On the basis of the vehicle position data and the operation signal, the ROM reading control unit 115 stores a large amount of map data in a map storage medium such as a DVD-ROM or a CD-ROM (hereinafter abbreviated as "DVD-ROM"). .)) And reads a predetermined map from 116 and stores it in the map buffer 117. This map data is output to various functional units in the navigation control device 100 via the map data line 118,
It is used for various purposes described later. The vehicle position data line 109, the operation signal data line 114, and the map data line 118 are shown for clarifying the input and output of data in the description of FIG. Is performed by transmitting a signal on a common bus line.

A vehicle speed sensor 120 and various sensors 121 that can detect the running state of the vehicle as required, such as a steering angle sensor, a transmission operation sensor, and a brake operation sensor.
Is input to the vehicle running state detection unit 122. The signal of the vehicle running state is output to the map selection control unit 136 and the display screen number / screen ratio switching unit 144, and is used as a reference signal for automatically controlling the display of an image as described later in detail. In addition, the navigation control device 100 is provided with a VICS receiver 125 for receiving FM multiplex broadcasting and the like, and the received signal is temporarily stored in a VICS information buffer 126 and updated as appropriate.

The navigation device can perform various functions by inputting such various data.
The navigation control device 100 in FIG. 1 mainly shows an image processing function part for the image display device 130, and omits a functional unit and the like for a voice recognition device, for example. In the guidance route calculation unit 131, the vehicle position signal generation unit 1
08, the current position data is input, and the operation signal input unit 11
In response to a search instruction for designation of a destination, a waypoint, expressway priority, etc., the traffic congestion information from the VICS information buffer 126 is input as appropriate, and various costs are calculated to calculate an optimal guidance route. The result is stored in the guidance route memory 132, and the guidance route drawing unit 133 can display the guidance route in various forms. The VICS information buffer 1
A part of the information 26 is converted into image data by the VICS information display unit 134.

In the intersection guidance display section 135, the vehicle position from the vehicle position signal generation section 108 and the map buffer 117
Is determined based on the map information from the vehicle and the guidance route information from the guidance route memory 132, and determines whether or not the vehicle's current position has reached the vicinity of the right / left turn intersection on the guidance route. create.

A narrow street traveling detecting section 1 provided in a vehicle traveling state detecting section 123 for detecting various traveling states of a vehicle.
At 28, a vehicle position signal and map data are fetched, and it is determined whether or not the position of the vehicle currently traveling is on a narrow street. The map selection control unit 136 includes a narrow street traveling detection unit 1
28, a vehicle speed signal from the vehicle running state detection unit 122, and the like.
The first map memory 137 and the second map memory 138 according to the vehicle position from the map, the map data from the map buffer 117, and the screen display instruction signal from the operation signal input unit 113.
Of the map data of the map buffer 117, map data of a predetermined scale is designated and fetched and stored.

The display system designating section 142 receives, for example, a bird's-eye view from the operation signal input section 113 based on the vehicle position.
A signal for displaying a map of a designated display method such as 3D display is transmitted to the first map drawing unit 140 and the second map drawing unit 141 corresponding to each screen for two-screen display. The first map drawing unit 140 and the second map drawing unit 141 perform an operation for displaying a map based on the current vehicle position according to the indicated display method, and create and draw image data of the map. , A predetermined scale map is drawn in a predetermined range by a predetermined display method.

In the display screen number / display ratio setting section 144,
A vehicle running state signal such as a vehicle speed signal from the vehicle running state detecting section 122 and whether or not the vehicle is running on a narrow street from a narrow street running detecting section 128 taken in through the map selection control section 136. In response to such a signal or various signals from the map selection control unit 136 as necessary, the display state of the map screen formed by the map screen forming unit 145 is switched, for example, between one-screen display and two-screen display, Settings such as changing the display area ratio of both screens during the two-screen display are made.

The navigation control device shown in FIG. 1 includes an information search unit 147, and a search instruction signal from the operation signal input unit 113 and a map buffer 117.
The information of various facilities and the like attached to the map taken in is retrieved from the map buffer 117, a search is performed, and the result is formed into image data in the search information display unit 148 according to the display instruction from the operation signal input unit 113. ing. In addition, there are provided various mark generation units 150 for generating various marks to be displayed on the screen, an operation screen generation unit 151 for using the screen as a touch panel, and the like.

The image synthesizing unit 152 includes, among the various images formed as described above, the map screen forming unit 14.
5, the guidance route from the guidance route drawing unit 133, the own vehicle position mark from the various mark generation units, and the like, and perform image processing such as necessary transparency processing to combine the images. Output to and display.

In the above navigation device, map data stored in a DVD-ROM or the like is:
For example, it is recorded for each layer as shown in FIG.
In other words, map data including narrow streets is recorded in layer 0 in the figure, whereas map data in which roads equal to or larger than the main municipal road are recorded in layer 1. Therefore, the narrow streets indicated by the thin lines in the layer 0 in the figure are not recorded in the layer 1, and only the roads indicated by the thick lines in the layer 0 are recorded in the layer 1 as roads equal to or larger than the main municipal road. Similarly, since the roads above the prefectural roads are recorded in the hierarchical level 2, not only the narrow streets in the hierarchical level 0 but also the main municipal roads are not recorded. Road is level 2
In the example shown in the figure, all the road data of the layer 3 in which the national road is not recorded is recorded in the layer 4 because only the national road is recorded in the layer 4 and the map data under the prefectural road is not recorded. Not recorded.

With such a hierarchical structure of map data,
When the image is displayed on the image display device of the navigation device in the two-screen split mode, when a detailed map is displayed on one screen and a wide area map is displayed on the other screen, the map displayed there is, for example, a map shown in FIG. The map is as shown in a). In FIG. 3A, the entire screen A is divided into the same size on the right screen B and the left screen C and displayed, and the right screen B displays a wide-area map. A map representing roads that are equal to or higher than the prefectural road of the hierarchy 2 in FIG. 2 is displayed. On the other hand, left screen C
Shows a detailed map of an area Q indicated by a broken line frame around the own vehicle position mark P in the right screen B, and this area is a map showing up to the level 0 narrow street in FIG. . In addition, the user can arbitrarily set the hierarchy of the map displayed on the two screens as needed.

In the present invention, during the two-screen split display as described above, for example, in the example of FIG.
The left screen C shows a state where the vehicle is traveling on National Road No. 1 indicated by K. At this time, a wide area map is displayed on the right screen B, and a detailed map including narrow streets is displayed on the left screen C. In this state, when turning left from the national highway K and entering a narrow street indicated by S in FIG. 3, a one-screen display as shown in FIG.
In the screen, a map including narrow streets is displayed on the entire screen. In FIG. 3B, the entire screen is rotated by 90 degrees along the traveling direction of the vehicle and displayed as a result of the vehicle turning left as described above.

In the present invention, a detailed map can be displayed on one screen while traveling on a narrow street, for example, by the navigation control device 100 shown in FIG. 1 according to the operation flow shown in FIG. . First, the current vehicle position and road data are taken in as basic data for image display (step S1). In the navigation control device 100 shown in FIG. 1, the capture is performed by the narrow street traveling detection unit 128 capturing the vehicle position signal from the vehicle position signal generation unit 108 and the map data from the map buffer 117. .

Next, based on both data, it is determined whether or not the vehicle is running on a narrow street (step S2). At the time of this determination, it can be determined based on whether or not the road where the vehicle position exists is a road stored only in the narrow street display hierarchy of the hierarchy 0 shown in FIG. 2 in the map data.
In addition, it is possible to determine whether or not the currently running road is a narrow street based on data representing the type of the road in the road data, or whether the road is smaller than a predetermined width from the road width data. The determination can be made by various means, such as whether or not the length is equal to or less than a predetermined length from the length data of the road.

As a result of the above determination, when it is determined that the vehicle is traveling on a narrow street, the navigation control device 100 shown in FIG. The operation state of the number-of-screens / screen-ratio setting unit 144 is detected and determined (step S3). If a two-screen display setting signal is being output, the number of screens / screen ratio setting unit 144 is switched to one screen. The switching instruction signal is output. In addition, the map selection control unit 136 instructs the second map memory 138 to fetch map data including narrow streets, for example, and sends the data of the second map memory to the display screen number / screen ratio setting unit 144. And instructs the user to select map data of the second map drawing unit that handles.

The second map drawing section 141 performs display calculations based on the map data in the second map memory and in accordance with designation of a standard display method from the display method designation section 142 or a display method such as a bird's-eye view display method. Map drawing data is created, and the map screen forming unit 145 fetches the data, and receives the second screen according to the one-screen display instruction from the display screen number / screen ratio setting unit 144 and the data selection instruction from the second map drawing unit. A map screen is formed so that the image data of the map drawing section 141 is displayed on one screen, and output to the image synthesizing section 152. As a result, in the image display device 130, the screen shown in FIG.
A detailed map including a narrow street as shown in (b) is displayed on the entire screen (step S5). When it is determined in step S3 that one screen is currently displayed,
A detailed map including a narrow street is displayed as it is in the same manner as above.

On the other hand, when it is determined in step S2 that the vehicle is not traveling on a narrow street, various modes of map screen display can be performed by the same operation as in the related art. Step S6) If there is no such switching instruction, it is determined whether or not a two-screen display is currently being performed (step S7).
As shown in (a), a wide area map is displayed on the first screen (step S8), and a detailed map is displayed on the second screen (step S9). At this time, the scale of the wide area map and the scale of the detailed map can be set to appropriate ones in advance, and when it is desired to change the scale, the scale can be switched by determining in step S6 whether or not there is a display switching instruction. .

If it is determined in step S7 that two screens are not being displayed, the current display is continued (step S10). If it is determined in step S6 that a display switching instruction has been issued, the screen is switched to the instructed display (step S11). In this way, various maps can be displayed on the image display device, and when a vehicle enters a narrow street, a detailed map can be immediately displayed on one screen. A large detailed map can be automatically displayed on the entire screen without performing the switching instruction operation.

On the other hand, in the present invention, for example, FIG.
As shown in (a), when displaying two screens on an image display device, when a map screen display method is adopted in which the size of the right screen and the left screen are made different and the screen is divided into a large screen and a small screen, For example, as shown in the figure, a wide area map is displayed with the right screen D as a large screen, the left screen E as a small screen, and a map in a range indicated by a broken line frame Q around the vehicle position mark P in the right screen D When the vehicle speed becomes lower than a predetermined speed from the state where the detailed map corresponding to
As shown in (b), the right screen D displaying the wide area map can be made small, and the left screen E displaying the detailed map can be made large. That is, when the vehicle speed is equal to or lower than the predetermined value, it is necessary to know the surrounding road conditions in more detail. In the present invention, at this time, the user such as the driver does not need to perform any operation without using the detailed map. So that you can see it. The scale of the detailed map automatically displayed at this time can be set so as to be changed according to the vehicle speed, or set so that a map including a narrow street is always displayed when the vehicle speed is equal to or less than a predetermined vehicle speed. You can leave it.

The above function can be performed by the operation flow shown in FIG. This will be described with reference to the functional block diagram of the navigation control device 100 shown in FIG. 1. The vehicle running state detection unit 122 detects the vehicle speed by inputting vehicle speed data from the vehicle speed sensor 120 (step S21). It should be noted that this vehicle speed is determined by the self-contained navigation sensor 10.
6 can also be obtained from the data from the distance sensor 105. Based on the detected vehicle speed, it is determined whether the vehicle speed is equal to or lower than a predetermined vehicle speed, for example, 30 km / h or less (step S22). In this determination, in addition to the determination as to whether or not the vehicle speed has become equal to or lower than a predetermined value, for example, a determination as to whether or not the vehicle has traveled at a low vehicle speed for a predetermined time or more or a predetermined distance or more may be further added. it can.

When it is determined that the vehicle speed is equal to or lower than the predetermined vehicle speed as a result of the above determination by the vehicle running state detecting unit 122, a ratio change signal is output to the display screen number / screen ratio setting unit 144, and the display screen number / screen In the ratio setting unit 144, for example, as shown in FIG.
The left screen E of the small screen displaying the detailed map as shown in FIG. 5A is changed to a large screen as shown in FIG. 5B, and the detailed map is displayed on the entire surface of the large screen. (Step S23). Conversely, the right screen D of the large screen which has been displaying the wide area map is set as a small screen, and a detailed map is displayed within the small screen (step S24). As a result, the right screen D
Is displayed on the left screen E in the range of the broken line frame around the own vehicle position mark P in FIG. On the other hand, if it is determined in step S22 that the vehicle speed exceeds the predetermined value, a wide area map is displayed on the large screen side (step S25), and the detailed map is displayed on the small screen side, as shown in FIG. A map is displayed (step S26).

In the above embodiment, when displaying a detailed map on the large screen and a wide area map on the small screen,
The small screen side is used as a large screen at the same position, and the large screen side is used as a small screen at the same position. The left and right positions of the large screen and the small screen are interchanged. As shown in the figure, the detailed map is displayed in the same size instead of the wide area map displayed on the large screen of the right screen D, and the detailed map is displayed instead of the detailed map displayed on the small screen of the left screen E. It can also be configured to display a wide area map in size. By displaying in this manner, a large screen, which is an important map screen, can always be arranged on the side closer to the driver.

Further, when the vehicle speed is equal to or lower than a predetermined value, the detailed map is displayed on the large screen side as described above, and a large / small screen ratio is displayed on the small screen side, while the vehicle speed exceeds the predetermined value. As shown in FIG. 3A, it is also possible to change the screen ratio into two equal screens of one screen, and to display a wide area map on one side and a detailed map on the other side.

In the above embodiment, when it is detected that the vehicle is traveling on a narrow street, the two-screen display shown in FIG.
An example in which only a detailed map including a narrow street as shown in (b) is displayed on a single screen is shown. For example, a detailed map including a narrow street as shown in FIGS. Alternatively, a large / small two-screen display using a wide area map as a small screen may be used. Similarly, in the above embodiment, when the vehicle speed becomes equal to or lower than a predetermined value, a detailed map as shown in FIG. 5B is displayed on a large screen, and a wide area map is displayed on a small screen. However, for example, as shown in FIG. 3B, a single screen display of only a detailed map may be used.

[0044]

The present invention is configured as described above.
The invention according to claim 1 can switch between two-screen display and one-screen display in accordance with the traveling state of the vehicle, or can automatically change the size ratio of each screen in the multi-screen split display. This eliminates the need for the driver or the like to change the screen display as in the case of the device. Further, since it is not necessary for the driver to perform the screen display changing operation as described above, there is no hindrance to driving.

According to the second aspect of the present invention, when the vehicle is running on a narrow street, the map including the narrow street is automatically displayed on one screen, or the map including the narrow street is displayed in a large size. A map suitable for traveling on a narrow street can be displayed in an easily viewable manner without performing any operation. In addition, since the display is automatically performed as described above, there is no hindrance to driving.

According to the third aspect of the invention, when the vehicle speed is equal to or lower than a predetermined value, the detailed map can be displayed on one screen, or the detailed map can be displayed at a screen ratio larger than the wide area map. Therefore, when the vehicle speed is high, the wide area map is automatically displayed large without any operation to know the situation of a wide range, and when the vehicle speed is low, the detailed map is automatically displayed large and the surroundings are automatically displayed. Since the user can know the detailed situation, the convenience of the navigation device is improved.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a navigation device according to the present invention.

FIG. 2 is an explanatory diagram showing a hierarchy of map data used in the present invention.

FIG. 3 shows an example of changing the number of screen displays according to the present invention;
(A) shows an example in which two screens are displayed in equal divisions,
(B) shows an example in which a detailed map is displayed on one screen.

FIG. 4 is an operation flowchart for changing a screen display during traveling on a narrow street according to the present invention.

FIG. 5 shows an example of changing the screen ratio in the present invention;
(A) shows an example of displaying a wide area map on a large screen,
(B) shows an example in which a detailed map is displayed on a large screen.

6 shows an example of changing the screen ratio in the present invention, and FIG.
FIG. 3A shows an example in which a detailed map is displayed on a large screen portion.

FIG. 7 is an operation flowchart for changing the screen display according to the vehicle speed in the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 navigation control device 108 vehicle position signal generating unit 113 operation signal input unit 117 map buffer 120 vehicle speed sensor 122 vehicle running state detecting unit 136 map selection control unit 144 display screen number / screen ratio setting unit 145 map screen forming unit 152 screen combining unit 130 Image display device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C032 HB05 HB23 HB24 HC14 HC15 HC23 HC24 HC26 2F029 AA02 AB01 AB07 AB09 AC01 AC02 AC04 AC13 AD01 AD07 5H180 AA01 BB02 BB04 BB13 EE18 FF04 FF05 FF07 FF12 FF13 FF32 FF22 FF13 FF22 FF13 FF22

Claims (3)

[Claims] 1. A vehicle running state detecting section for detecting various running states of a vehicle, a display screen setting section for setting the number of display screens or a screen ratio of a plurality of screens according to a signal from the vehicle running state detecting section. A map screen forming unit that forms a map screen to be displayed on the image display device in response to a signal from the display screen setting unit, wherein the display screen setting unit includes the number of map screens displayed on the image display device or a plurality of screens A navigation device, wherein the ratio is set in accordance with a running state. 2. The vehicle driving state detecting section includes a narrow street traveling detecting section for detecting whether or not the vehicle is traveling on a narrow street, and the display screen setting section includes a narrow street when the narrow street traveling is detected. 2. The navigation device according to claim 1, wherein the map is set to a one-screen display of a map or a screen display in which a map including narrow streets is displayed at a larger screen ratio than other maps. 3. The vehicle running state detecting section detects whether the vehicle speed is equal to or lower than a predetermined value, and when the vehicle speed is equal to or lower than the predetermined value, the display screen setting section displays one screen of a detailed map or details. 2. The navigation device according to claim 1, wherein the map is set to a screen display that displays the map at a screen ratio larger than the wide area map.