JPS6396690A - Map data display device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] B. Industrial application field The present invention relates to a map data display device.

Conventional technology A technique for recording map data on a recording medium such as a disk or magnetic tape and displaying it on a display means such as a CRT is disclosed in, for example, Japanese Patent Laid-Open No. 59-64985 (HO4N 5/93).
), Magazine “Nikkei Electronics J March 2, 1986
It is disclosed in the 4th issue, pages 92-95, etc.

Consider a case where such a map data reproducing device is installed in a car and the car is driven based on a map completely displayed on the screen of the display means. When recording map data on a recording medium, a certain regional range is divided appropriately and a certain unit (for example, 1
It is conceivable to record each unit (0 kra x lokm) and reproduce and display this unit as one screen. In this case, when a car is driving near a certain section and another section adjacent to it (i.e., near the boundary line of the divided map), the map displayed on the screen of the display means changes frequently, making it extremely difficult to see. It can be a state.

C. Problems to be Solved by the Invention It is an object of the present invention to solve the above-mentioned drawbacks of the prior art and to propose a map data display device that can display an easy-to-read map even when driving near the boundaries of a map. It is something to do.

2. Means for solving the problem: A map configured to reproduce a recording medium in which multiple pieces of map data obtained by dividing a predetermined area are recorded, and display this reproduced map data on a display screen. The data reproducing device includes an image memory for storing reproduced map data including the current position and reproduced map data of an area adjacent to the area of the reproduced map data, and an address control means for specifying a display address for the image memory. and display map data of an address portion designated by the address control means stored in the image memory on a display screen.

E. Since the action image memory stores map data of adjacent areas in addition to map data including the current location, the address control means can be used to select map data of a section where the current location is approximately in the center. It can be read from the image memory and displayed.

As a storage medium for storing the example map data, a CD-ROM is used.
Discs can be used. CD-RO? ! The format for recording data on a disk is introduced, for example, in II Magazine R Electronics, February 1985 issue, pages 73 to 80, and since it is not the gist of the present invention, its explanation will be omitted.

Figure 1 is a diagram showing the structure of map data, in which a predetermined area is divided into (A, B, C,...), and the map data is configured with these divided areas as one unit. There is. That is, one divided area is composed of 600×400 dots, which corresponds to the display area of the display screen.

FIG. 2 is a diagram showing a map data display device according to the present invention, in which the disk drive device (1) is a device for reading map data from a CD-ROM disk, and includes an optical pickup and a disk rotation drive device. etc., and can be configured in the same way as a normal compact disc player. Control equipment! <2) is a disk drive installation! (1) A circuit that performs predetermined processing (digital demodulation, error detection and correction, etc.) on the digital data output from the device (such a circuit can be configured in the same way as a normal compact disc player), which converts the digital map data into an image. The microcomputer, which includes a circuit for creating data (map image data), a microcomputer, etc., performs control such as instructing the disk drive device the address of the map data to be read from the disk by outputting instructions from various circuits described later. Control device (2)
The map image data of multiple divided areas that can be outputted is stored in the image memory (3).This image memory (3)
Of the map data stored in the address control means (4
), the map data of the addressed portion is retrieved and stored in the display memory (5). Therefore, the map data stored in the display memory (5) is displayed on the screen of the display means (6) such as a CRT.

In the map shown in Figure 1, the current position is point a,
Let us assume that the car starts from point a, passes through point c, and then travels to point d.

The map data that should be read out from the disk and displayed at the starting point (a) is the map data for area E. This may be instructed manually, but it is configured to be instructed automatically. You can also do that.

In case of automatic designation, a position detection device (7) is provided to detect the position of the vehicle.The position detection device (7) is a satellite navigation device that detects its own position by receiving radio waves from an artificial satellite, or It is possible to use a device that detects its own position by receiving a signal emitted from a position information oscillator (beacon) installed at an intersection every time it passes an intersection.

Now, when the map data of the area E including the starting point (a) is selected in this way, the <A area adjacent to this E area
, B, C, D, F, G, H, I) are also read from the disk and stored in the image memory (3) together with the map data of the E area. will store map data for area E including the current location rL (point a) and all areas surrounding it. Then, in response to the output of the position detection Ie (7), the control VC
! (2) The address output from address control means (
4) and then -C1 corresponds to this address
Regional map data is read out from the image memory (3), stored in the display memory (5), and displayed on the screen of the display means (6).

Now, if you start from point (a) and come to the vicinity of point b, it will be easier to see if the map data of the area surrounded by the broken line in Fig. 1 is displayed on the screen.Therefore, in the present invention, As shown in Figure 3, one area displayed on the screen is divided into four quadrants, and for example, when moving in the P direction in quadrant II, the map of the area indicated by the broken line in Figure 1 is used. The data shall be displayed. Then, if you operate the key (P) of the display switching keys (8), the control device (2
), the address and display switching signals are sent to the address control means (
4), and the map data indicated by the broken line in FIG. 1 is read out from the image memory (3), stored in the display memory (5), and displayed on the screen of the display means (6).

In this embodiment, four keys (P-3) corresponding to the diagonal direction are provided as the display switching keys (8), but four keys corresponding to the up, down, right, and left directions may also be added. For example, if you operate the direction key when you are in the upper part of area E, map data showing the upper part of area E and the lower part of area B will be displayed.

For example, if a car is in area B, it is necessary to store map data for eight areas adjacent to area B in the image memory (3). , the map data of the three areas (G, H, C) that are no longer needed may be replaced with the map data of the three areas above the area (A, B, C) and stored, that is, the image It is not necessary to store map data in the memory (3) in the same layout as the actual map.
C.

...) rather than displaying the map data as is,
When displaying areas divided into new categories based on the map data stored in the image memory (3), this image memory (3)
Unlike the case where the area indicated by the broken line in FIG. 1 is displayed, the address specification for 3) is not a continuous address specification, but such discontinuous address specification is also possible.

In addition, in this embodiment, map data for a total of nine areas can be stored in the image memory (3), but it may be configured to store map data for four areas.In this case, for example, from point a in FIG. If you want to move towards the upper right, select the region (B, C
, E, F), or the area (A, B) when moving toward the upper left.

The map data of D and E) is stored in the image memory (3).

Next, an embodiment in which the above-mentioned display switching is performed automatically without manual operation of the display switching key (8) will be described with reference to FIG. 4.

The map displayed on the screen of the display means (6) is divided into four quadrants (I, II, II, mV) as shown in Figure 3, and the position detection device indicates that the traveling car is in the first quadrant. f
! L<7), the X value holding circuit (10
) for “1°I, @ for Y value holding circuit (11)
I IT is a position detection device! (7) Output can be completed. Similarly, when in the second quadrant, the X and Y value holding circuits (10,
11), when (0,1) is in the ■quadrant (0
, 0> are in the second quadrant, (1, 0) are output respectively, and these values are stored in the X and Y value holding circuits as 10°11)
will be held.

On the other hand, the driving direction of the car is detected by the direction detection device (9), and the direction is divided into an X direction vector and a y direction vector and held in the xy direction vector holding circuits (12, 13>). "1" for the right direction of the X axis,
The left direction is 0°', and the y-vector signal is "1" above the y-axis and "0" below. When the car is traveling to the right of the X-axis (no y-direction component) The xy vector of is (1,0>), and the X7 vector when traveling upward on the y-axis (no X-direction component) is (0,1).

FIG. 4 shows a circuit for creating a map switching signal to be displayed on the screen based on the above-mentioned xy values and xy vectors. This display switching time M (19) is the display switching time M (19).
).

In Fig. 3, when the traveling car is in the first quadrant (at this time, both the X% and y values are 1") and the X%3' vectors are both "1° For example, in FIG. 1, when a car is driving on a map (E
) is at point b in the first quadrant of
It will be easier to see if the area is mapped with broken lines.

Therefore, in the display switching circuit (19) shown in FIG.
In the above case (i.e., when the A switching signal for switching from the currently displayed division to another division will be obtained.When this switching signal is applied to the control device (2),
Therefore, the address and display switching signal for displaying the map indicated by the broken line in FIG. 1 are output from the control device e(2).

Similarly, when the car is in the 1st quadrant and traveling in the Q direction, the gate (18) becomes H'', and the
When it is in the quadrant and traveling in the R direction, it is game) (1
7) becomes H11, and when the vehicle is in quadrant (1) and is traveling in the S direction, gate <16) becomes "H", and switching No. 16 can be obtained respectively.

G. Effects of the Invention According to the present invention described above, it is possible to display a map in which the user's location is always in the center of the displayed map, and it is possible to provide an easy-to-read map. Furthermore, since the map data of the area where the user is located and the area adjacent thereto is stored in the image memory, the display can be switched quickly. That is, in the past, when switching from the display state of a map of one region to the display state of a map of another region, it was necessary to access the disk that is the map data recording medium and read the desired map data. However, according to the present invention, it is only necessary to change the read address for the image memory, and display switching can be made faster.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the structure of map data, Fig. 2 is a diagram showing the map data display 'j:, W of the present invention, Fig. 3 is a diagram showing the relationship between the quadrants of the map and the driving direction, and Fig. 4 is a diagram showing the relationship between the map quadrant and the driving direction. FIG. 2 is a diagram showing a display switching circuit. (1)... is a disk drive device, (2) is a control device, (3) is an image memory, (4) is an address control means, 5) is a display memory, and (6) is a display means.

Claims (1)

[Claims] (1) A map data display device configured to reproduce a recording medium in which a plurality of map data obtained by dividing a predetermined area are recorded, and display this reproduced map data on a display screen, An image memory for storing reproduced map data including the current position and reproduced map data of an area adjacent to the area of the reproduced map data, and an address control means for specifying a display address for the image memory, the image memory 1. A map data display device, characterized in that it is configured to display on a display screen map data of an address portion designated by the address control means stored in the address control means.