JPS62111398A - Onboard map display unit - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an in-vehicle map display device that displays the current location of a vehicle, a road map, information necessary for driving, and the like.

(Prior Art) Conventionally, as shown in FIG. 6, this type of in-vehicle map display device includes a speed sensor 30I, a direction sensor 302, a position/direction detection means 303, an operation information input means 304. It is equipped with a page management means 305, a work buffer means 307, and a display control means 308, and it is possible to calculate the display address at high speed and obtain a rotated display output, or to rotate all blocks in the work buffer and set it. was configured to rotate the map.

(Problems to be Solved by the Invention) The above configuration has the drawback of high power consumption because the display address is calculated at high speed. Furthermore, the method of rotating all blocks in the work buffer means has the disadvantage that the amount of data to be rotated is large, the setting time is long, and the rotation of the map is not smooth.

SUMMARY OF THE INVENTION An object of the present invention is to provide an on-vehicle map display device that eliminates the drawbacks of the prior art, consumes less power, is downsized, and can rotate a map smoothly.

(Means for Solving the Problems) The in-vehicle map display device of the present invention provides four adjacent maps that do not overlap.
Work buffer means for storing map information for blocks, display buffer means for extracting and storing display information, and display control for outputting the display information in the display buffer means according to the display device. a copying means having a function of copying any block in the work buffer means to any other block, and a function of copying any area in the work buffer means to the display buffer means as is or with rotation; It is equipped with the following.

(Function) With the above configuration, when the traveling direction of the vehicle is maintained continuously at a certain angle, a predetermined area in the work buffer means is rotated by a certain angle and copied to the display buffer means.
The map can be rotated depending on the direction of travel.

(Example) An example of the present invention will be described based on FIGS. 1 to 5.

FIG. 1 is a block diagram of an in-vehicle map display device of the present invention. In the figure, 1 is a speed sensor and 2 is a direction sensor, which are connected to position and direction detection means 3. 4 is an operation information manual means for changing the operation mode of the device and inputting a starting point position and a correction position, and a page management means 5
It is connected to the. Reference numeral 6 denotes auxiliary storage means for storing map information, and is connected to work buffer means 7.

Reference numeral 8 denotes a copying means which has a function of copying between blocks in the work buffer means 7 and a function of rotationally copying an arbitrary area in the work buffer means to the display buffer means 9, and the work buffer means 7 and the display buffer means A control signal for copying is sent to 9. 10 is a display control means for outputting the contents of the display buffer means 9 according to an externally connected display disk; 1 display buffer means 9;
and is connected to the page management means 5.

FIG. 2 shows the structural concept of the work buffer and definitions of functions and parameters indicating each area. In the figure, W(x, y) is a block area of a work buffer with (x, y) as the lower left vertex. However, 0≦x,y
≦α is an integer. α indicates the vertical and horizontal widths of the map block. β is a value indicating the width of the map switching area. Due to differences in copy processing, this area is
S 41 S S I S 'G I S 'lt
It is divided into the S1 area. If the absolute coordinates of the current vehicle position are (x'+y'), the relative coordinates in the work buffer are expressed as (x'-Xpl, yl-yP).

Here, X2, y are offset values with respect to the absolute coordinates of the origin of the work buffer, and take values that are integral multiples of α. γ is 1
This value indicates the vertical and horizontal width of the displayed area.

(X (l Y a) is the coordinate indicating the lower left vertex of the displayed area, x, 1:=x'-x, -γ/2, Ya=V
' Takes the value of Yp-γ/2. The area in the work buffer that is copied to the display buffer is o(xg+y,+)
Indicated by

FIG. 3 shows a block layout of map information. In the figure, A(x+y) is area information in which absolute coordinates (x+y) are the lower left vertex of the map block. X+y
takes a value that is an integer multiple of α.

Next, the operation of the above embodiment will be explained. In the above embodiment, when the operation information input means 4 sends a starting point position signal,
The page management means 5 takes in the data, performs the processing as shown in FIG. The work buffer means 7 is set in the most advantageous state for scrolling. Next, the portion D (xi, yl) corresponding to the display area is copied to the display buffer means 9 so that the current position is displayed at the center of the display screen.

When the vehicle starts running, running information is sent from the speed sensor 1 and the direction sensor 2 to the position and direction detection means 3.

The position/direction detection means 3 calculates the current position and direction from the driving information and sends it to the page management means 5. The page management means 5 monitors whether the current position of the vehicle is included in the map switching areas S, S2, . . . S, according to the processing procedure shown in FIG. According to the processing procedure, a copy command is sent to the copy means 8, a read command is sent to the auxiliary storage means 6, and the work buffer means 7 is updated. Prior to this update, the display area of the work buffer with the current position as the display center is rotated and copied to the display buffer means 9. The display control means 10 controls the output of the contents of the display buffer means 9 in accordance with the display device.

As described above, according to the above embodiment, the page management means 5 is configured so that when the vehicle moves, the vehicle surface position is determined in the map switching area S2.
1 S3...When detecting that it is included in S8, copies between map blocks in the work buffer means 7, reads a new necessary map block from the auxiliary storage means 6, and changes the display area to the map switching area. Since one display area is controlled so as not to be included and one display area is rotated and copied to the display buffer means 9, smooth scrolling and rotation of the map can be realized even at the map buffer boundary.

Note that in the above embodiment, the display buffer is made up of one page, but the display buffer may be made up of a plurality of pages. In this case, furthermore, since transient operations during rotational copying are not visible, smoother display can be achieved.

(Effects of the Invention) According to the present invention, the map in the work buffer means 7 has the following functions:
The area of σ can be rotated and copied to the display buffer means 9, and has the advantage that the rotation area of the map can be limited to the amount necessary for display.

Furthermore, since the rotational area can be made smaller, rotational copying can be accomplished in a short time, and a low-speed circuit process can be selected, resulting in lower power consumption and miniaturization.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an in-vehicle map display device according to an embodiment of the present invention, FIG. 2 is a conceptual diagram of the structure of the work buffer means and a relationship diagram of functions and parameters showing each area, and FIG. 3 is a diagram showing map information. 4 is a flowchart of processing in the page management means, FIG. 5 is a detailed flowchart of the scroll and rotation processing section, and FIG. 6 is a block diagram of a conventional in-vehicle map display device. 1...Speed sensor, 2...Direction sensor, 3.
...Position/direction detection means, 4...Operation information input means, 5...Page management means, 6...Auxiliary storage means, 7...Work buffer means, 8...Single stage copying, 9. ...Display buffer means, IO...
Display control means. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] Work buffer means for storing map information for four adjacent blocks that do not overlap; display buffer means for extracting and storing display information; and outputting display information in the display buffer means in accordance with a display device. display control means for copying any block in the work buffer means to any other block, and copying any area in the work buffer means to the display buffer means as is or with rotation. An in-vehicle map display device characterized by comprising a copying means having a function of copying.