JPH08328468A - Map display device and navigation device - Google Patents

Abstract

PURPOSE: To instantaneously redisplay a map, which is displayed once by a display means, by an easy operation by constituting the display device so that a specific map, which is displayed by the display means once, is redisplayed in response to the operation. CONSTITUTION: Based on the present position latitude.longitude data mainly sent by a GPS block 2, a CPU8 reads the map data in the vicinity of the present position from a CD block 4 through a CPU peripheral circuit G/A9. The above information is transmitted to a monitor block 5 as video signals through a graphic controller 11 to which a video RAM10 is connected. Thus, a road map is displayed on the screen of the display device of the block 5. When a redisplay KEY is pressed, the picture data stored in the RAM 10 are read and the map is displayed on the screen 5. In other words, the specific map, which is displayed once on the screen, is redisplayed without a CD-ROM being accessed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map display device for displaying a map on a screen.

[0002]

2. Description of the Related Art Conventionally, as a device of this type, a navigation device for guiding a vehicle to a destination while displaying a map on which a current position is displayed on a monitor screen has been widely used. In such a navigation device, when the current location is displayed on the screen, if the user wants to refer to another point that does not exist on the same screen, the map on the screen is scrolled from the current location to an arbitrary point. Has become. At this time, the following processing is performed in the navigation device. That is, as shown in FIGS. 4 and 5, a plurality of maps having areas overlapping each other, that is, a first map a including the current location A, a second map b, a third map c, and a fourth map d, The map data necessary for displaying the series of maps including the fifth map e including the arbitrary point B is sequentially read from the CD-ROM or the like, and the series of maps are continuously displayed based on the read map data. Let them do it. It should be noted that the navigation device is generally provided with the current location KEY, and the current location KEY
By pressing, a map showing the current location (first map a in the example of FIG. 4) can be displayed on the screen of the monitor as needed.

[0003]

However, in such a conventional navigation device, an arbitrary point B is once referred to, and the present location A is displayed by operating the present location KEY or the like, When referring to the arbitrary point B again, it is necessary to repeat the operation of scrolling the map on the screen from the current position A toward the arbitrary point B, and when referring to the arbitrary point B again. The operation was complicated.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a map display device capable of re-displaying a map once displayed by a simple operation.

[0005]

In order to solve the above problems, in a map display device of the present invention, at least a dynamic memory means for storing map data, a self position specifying means for specifying a self position, A display means for reading the map designated by the self-location specifying means from the dynamic memory means and displaying it; an image data storage means for storing image data of the specific map displayed by the display means; And a display control unit for reading the image data from the image data storage unit and displaying the specific map on the display unit based on the read image data.

Further, map data storage means for storing map data, display means for displaying a map based on the map data read out from the map data storage means, and display means for displaying a specific map Map information storage means for storing map information for specifying the map data, and after reading the map information from the map information storage means in response to an operation, store the map data specified by the read map information for the map data storage. And display control means for displaying the specific map on the display means based on the read map data.

Further, the specific map may be the map displayed last on the display means, or may be provided with a designating means for designating the specific map.

Further, in a navigation device for guiding a destination to a destination while displaying a map on which a self position is displayed on a screen, a map memory for storing map data composed of a plurality of regions and a map memory for scrolling the map memory are displayed. Scroll means for sequentially reading the map data of the series of areas and continuously displaying the map of the series of areas based on the read map data, and a map of an arbitrary area of the map displayed by the scroll means And a display control means for displaying the map data of the area stored in the storage means in response to a predetermined operation. I decided.

Further, in a navigation device for guiding a destination to a destination while displaying a map on which a self position is displayed on a screen, a map memory for storing map data composed of a plurality of areas and a self position for specifying the self position. Identification means,
Navigation means for reading the map data of the area corresponding to the self-position from the map memory, displaying the map of the area together with the self-position, and moving the area of the map data to be displayed with the movement of the self-position; Designating means for designating the map displayed by the navigation means, storage means for storing the area of the map data designated by the designating means, and map data for the area stored in the storage means in response to a predetermined operation. The display control means for displaying is provided.

[0010]

In the map display device having the above structure, the display control means reads out the image data of the specific map stored in the image data storage means and displays it on the display means according to the operation. That is, according to the operation, the specific map once displayed on the display means is displayed again on the display means.

Further, the display control means reads the map information from the map information storage means in response to the operation, then reads the map data specified by the read map information from the map data storage means, and the read map data. Based on the above, the map is displayed on the display means. That is, according to the operation, the specific map once displayed on the display means is displayed again on the display means.

Further, in the case where the specific map is the map displayed last on the display means, the map displayed last is redisplayed by the display control means. Also, in the case where the designating means for designating the specific map is provided, the specific map to be displayed again on the display means can be selected by the designating means according to the operation.

In the navigation device having the above structure, the display control means displays the map data of the area designated by the designation means and stored in the storage means in response to a predetermined operation. That is, the map once displayed and designated by the scrolling means or the navigation means is displayed again according to the operation.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 1 is a block diagram showing a navigation device showing a first embodiment according to the map display device of the present invention. This navigation device demodulates and decodes the antenna 1 installed on the roof of the vehicle body and the C / A code of the L1 band from the satellite received by the antenna 1 by the despreading LSI to obtain the latitude / longitude of the current position, that is, the position. It has a GPS block 2 for calculating data. The GPS block 2 is connected to a graphic block 3, and the graphic block 3 is connected to a CD block 4 and a monitor block 5 which realize the map data storage means of the present invention. The CD block 4 is the dynamic memory and map memory of the present invention in which map data including various road information such as intersection position data is stored.
For example, a CD-ROM conforming to the format of the Navigation Study Group is mounted, and the monitor block 5 is the display means of the present invention such as a CRT or LCD installed in the central portion of the instrument panel in the vehicle interior. It has a monitor (not shown).

On the other hand, in the graphic block 3, RO
A CPU 8 that controls the entire apparatus based on the program stored in M6 and the data stored in RAM 7 is provided. The CPU 8 realizes various means such as the display control means of the present invention, and is mainly the GPS block 2
Based on the latitude and longitude data of the current location sent from
Map data such as map information around the present location and road information is called from the CD block 4 via the PU peripheral circuit G / A 9. Then, such information is sent to the monitor block 5 as a video signal via the graphic controller 11 to which the video RAM 10 is connected. As a result, a road map or the like is displayed on the screen of the display device of the monitor block 5.

The RAM 7 serves as the map information storage means and storage means of the present invention, and also to the video RAM.
The image data storage means is realized by 10. A remote control type input key 12 is connected to the peripheral circuit G / A 9 of the CPU. The input key 12 is provided with a plurality of operation keys such as a current position key, a memory key, and a redisplay key, and the CPU 8 is adapted to perform various operations according to those operations.

Next, the operation of this embodiment having the above configuration will be described with reference to the flowchart of FIG. 2 showing the processing contents of the CPU 8. That is, the CPU 8 operates according to a main flow (not shown) and inputs KE at regular intervals.
Y12 (hereinafter referred to as a remote controller) is loaded with operation information, and the remote controller's memory K is stored during such processing.
It is determined whether or not EY has been pressed (SA1). When the memory KEY is pressed (YES in SA1
S), after writing the display screen of the monitor of the monitor block 5 to the video RAM 10 as it is (SA2), the process proceeds to the next. That is, at that time, if any of the first to fifth maps a to e illustrated in FIG. 5 is displayed on the screen of the monitor, the image data is stored as the image data of the specific map. R. On the other hand, if the memory key is not pressed (NO in SA1), nothing is done in step S
Proceed to A3.

At the next step SA3, it is determined whether or not the redisplay KEY of the remote controller has been pressed. If the redisplay key is pressed here (YES in SA3), V
The image data stored in the IDE RAM 10 is read out, the map is displayed on the screen (SA4), and the process returns to the main flow. That is, the specific map once displayed on the screen
It will be displayed again without accessing the CD-ROM. If no image data is stored in the VIDEO RAM 10 and if the redisplay key is not pressed (NO in SA3), the display screen is left as it is and the process returns to the main flow.

Therefore, as illustrated in FIG. 4, the present location A
When an arbitrary point B away from is referred to, if the fifth map e including the arbitrary point B is designated as a specific map by pressing the memory KEY of the remote controller, the current location A and the current location A can be displayed on the screen of the monitor. Even when the menu screen is displayed, when it is desired to refer to an arbitrary point B, the fifth map e can be displayed again by an extremely simple operation by pressing the redisplay KEY on the remote controller. Further, even when a map with a different scale is displayed, an arbitrary point B can be referred to on the scale map once displayed. Moreover, in that case, since it is unnecessary to access the CD-ROM which is the dynamic memory, the fifth map e can be displayed instantaneously. Alternatively, when traveling to a destination along a preset route, by designating a desired point on the route such as an intersection as a specific point in advance, it is possible Accordingly, the intersection or the like can be instantly referred to.

Next, the second embodiment of the present invention will be described with reference to the above-mentioned C.
A description will be given according to the flowchart of FIG. 3 showing the processing contents of the PU 8. Similar to the first embodiment, the CPU 8 operates according to a main flow (not shown) and performs a process of fetching operation information of an input KEY 12 (hereinafter, referred to as a remote controller) at regular intervals. During such a process, the memory KEY of the remote controller is pressed. It is determined whether it has been done (SB1). Then, when the memory key is pressed (Y at SB1
ES), latitude and longitude data at the four corners of the monitor display screen, that is, when any of the first to fifth maps a to e illustrated in FIG. 5, for example, is displayed on the monitor screen. CD of CD block 4 for displaying map
-After storing map information that specifies the map data of the specific area read from the ROM in the RAM 7 (SB2), proceed to the next. On the other hand, when the memory KEY is not pressed (NO in SB1), nothing is done and the process proceeds to step SB3.

At the subsequent step SB3, it is determined whether or not the redisplay KEY of the remote controller has been pressed. Redisplay here K
When EY is pressed (YES in SB3), RA
After reading the latitude and longitude data stored in M7 (SB4), the CD-ROM is accessed, and the read latitude and longitude data is within the range of map data, that is, the latitude and longitude data. The map data of the specified area is searched and read out, and based on the map data, the specific map that was displayed when the memory key of the remote controller was pressed is displayed on the screen of the monitor (SB
5). Then return to the main flow. Step S
When it is determined in B3 that the redisplay key is not pressed, or when the latitude and longitude data are not stored in the RAM 7, the display screen is left as it is and the process returns to the main flow.

Therefore, also in this embodiment, as in the case of the first embodiment, if the memory key of the remote controller is pushed and an arbitrary map displayed on the monitor at that time is designated in advance as a specific map, By pressing the redisplay KEY on the remote control, the arbitrary map can be redisplayed on the monitor very easily. Therefore, the same effect as that of the first embodiment can be obtained.

In the first and second embodiments described above, by operating the memory KEY of the remote controller, it is possible to specify a particular map as an arbitrary map displayed on the screen of the monitor, which is convenient. However, the specific map to be displayed again may be a predetermined map. For example, when the specific map is the map displayed last on the screen of the monitor, the greater the distance between the current position A shown in FIG. It will be more prominent. Further, a plurality of maps may be designated as specific maps, and those maps may be selectively redisplayed. Further, in the present embodiment, only the navigation device equipped with the GPS is shown as the map display device of the present invention, but the effects described above can be obtained even when the present invention is used for other devices.

[0024]

As described above, in the map display device of the present invention, the specific map once displayed on the display means is re-displayed on the display means in response to the operation. It is possible to instantly re-display the map once displayed on the screen with an extremely simple operation.
Therefore, it is convenient. For example, in the navigation device, when referring to another point different from the current position once displayed on the display means, it is not necessary to repeat the operation of scrolling the map on the screen from the current position toward the point. Further, in a structure in which the specific map is the map displayed last on the display means, the greater the distance between the current position and another point different from the current position, the more remarkable the effect becomes. . Further, if the configuration is provided with a designating unit that designates a specific map, the specific map to be displayed again on the display unit can be selected as necessary, so that the usability is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment and a second embodiment of the present invention.

FIG. 2 is a flowchart showing a first embodiment of the present invention.

FIG. 3 is a flowchart showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a map display process in a conventional example.

FIG. 5 is a diagram showing an image displayed on a screen when the same display process is performed.

[Explanation of symbols]

 4 CD block 5 Monitor block 7 RAM 8 CPU 10 Video RAM

Claims (6)

[Claims] 1. A dynamic memory means for storing map data, a self-position specifying means for specifying a self-position, and at least a map specified by the self-position specifying means is read from the dynamic memory means and displayed. Display means, image data storage means for storing image data of a specific map displayed by the display means, reading the image data from the image data storage means in response to an operation, and displaying the image based on the read image data. A map display device comprising: a display control unit that causes the unit to display the specific map. 2. Map data storage means for storing map data, display means for displaying a map based on the map data read from the map data storage means, and display means for displaying a specific map. Map information storage means for storing map information for specifying the map data; and reading the map information from the map information storage means in response to an operation, and storing the map data specified by the read map information for the map data storage. A map display device comprising: a display control unit that reads the specific map from the display unit and displays the specific map on the display unit based on the read map data. 3. The map display device according to claim 1, wherein the specific map is a map displayed last on the display means. 4. The map display device according to claim 1, further comprising a specifying unit that specifies the specific map. 5. A navigation device for guiding a user to a destination while displaying a map on which a self-position is displayed on a screen, and a map memory for storing map data composed of a plurality of areas, and a scroll instruction for reading from the map memory. Scroll means for sequentially reading the map data of the series of areas and continuously displaying the map of the series of areas based on the read map data, and designating a map of any area of the maps displayed by the scroll means Specifying means, a storage means for storing the area of the map data specified by the specifying means, and a display control means for displaying the map data of the area stored in the storage means in response to a predetermined operation. A navigation device characterized by the above. 6. A navigation device for guiding a user to a destination while displaying a map on which a self position is displayed on a screen, and a map memory for storing map data composed of a plurality of areas, and a self position for specifying a self position. Navigation for moving the area of the map data to be displayed along with the movement of the self-position, the specifying means and the map data of the area corresponding to the self-position are read from the map memory, the map of the area is displayed together with the self-position. Means, designating means for designating the map displayed by the navigation means, storage means for storing an area of the map data designated by the designating means, and area stored in the storage means in response to a predetermined operation. And a display control means for displaying the map data of the navigation device.