JPH04177385A - On-vehicle map display unit - Google Patents

Abstract

PURPOSE:To make both of contraction and enlargement so as to be done so quickly by changing a scale display when a scale change takes place, while when reading and drawing motion is already performed, stopping the motion, and performing the reading and drawing motion with a newly specified scale. CONSTITUTION:When a scale display changing means 5 feeds data for changing a scale display to a control means 7, a scale is displayed by each display color showing the 'determination or indetermination' of this scale by a display control means 8 and a display means 9. Next, a map data reading drawing stopping means 6 feeds a command for stopping the reading drawing motion already atarted to the control means 7 and performs another reading drawing motion at a new scale instead. With this constitution, the scale specified by the means 5 is grasped, and simultaneously since it is quickly alterable to the scale specified by the means 6, responsiveness at time of enlargement/contraction becomes speedier.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an in-vehicle map display device that displays road map information to guide a driver to a destination.

Conventional technology Conventionally, this type of in-vehicle map display device overlays the current position of the vehicle, estimated based on position data detected by a direction sensor and a distance sensor, on a map displayed on a CRT display. It is configured to display

When enlarging/reducing a map displayed on a CRT display, the map can be displayed at a desired scale by sequentially switching the scale.

Problems to be Solved by the Invention However, in the above conventional in-vehicle map display device, in order to display a map at a desired scale, it is necessary to wait until the display is completed at each stage up to the desired scale. There was a problem in that it took a lot of time to obtain the scale.

The present invention solves these conventional problems,
It is an object of the present invention to provide an excellent in-vehicle map display device that can quickly perform reduction/enlargement even when selecting a scale that has several levels.

Means for Solving the Problems In order to achieve the above object, the present invention provides a scale display changing means for quickly recognizing a designated scale, and a scale display changing means for quickly recognizing a designated scale, and a display screen that displays a scale display when a reading/drawing operation has already started at a different scale. The map data reading and drawing aborting means is provided for stopping the operation and starting the readout and drawing operation at a new specified scale.

Therefore, according to the present invention, the specified scale can be determined by the scale display changing means, and the map data reading/drawing canceling means can quickly change to the specified scale, resulting in faster responsiveness during enlargement/reduction. It has this effect.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 1 is a direction sensor that detects the running direction of the vehicle, 2 is a distance sensor that detects the running distance of the vehicle,
3 is a touch panel that is a manual means. 4 is an auxiliary storage means for storing map data. 5 is a scale display changing means, and 6 is a map data reading/drawing canceling means. 7 is a control means that estimates the current position of the vehicle based on the position data detected by each sensor 1 and 2 and the map data from the auxiliary storage means 4, and also displays a scaled-down display based on the enlargement/reduction instruction from the touch panel 3. It instructs the changing means 5 to change the scale display, and also reads map data from the auxiliary storage means 4 and creates drawing data.

Reference numeral 8 denotes a display control means, which receives the drawing data and display start address from the control means 7 and repeatedly sends display information to the display means 9 at a predetermined period. 9 is “CR”
It is a display means such as a T-display, and displays the current position of the map and vehicle, the numerical value of the specified scale and/or the numerical value of the currently displayed scale, and the scale display color that indicates whether or not the scale has been determined. do.

Next, the operation of the above embodiment will be explained. When the vehicle is traveling normally, the current position of the vehicle is estimated in the control means 7 based on the position data detected by the direction sensor 1 and the distance sensor 2. The map data read out from the auxiliary storage means 4 is output to the display means 9 through the display control means 8. Then, the instruction to enlarge or reduce is on the touch panel 3.
When input from the auxiliary storage means 4, the control means 7 displays the scale, reads map data necessary for displaying the scale from the auxiliary storage means 4, and starts drawing.

At this time, when the scale display changing means 5 sends data for changing the scale display to the control means 7, the display control means 8 and the display means 9 display the scale in a display color that indicates whether the scale is determined or not. . Next, the map data reading/drawing aborting means 6 sends a command to the control means 7 to abort the already started reading/drawing operation, and causes the control means 7 to perform the reading/drawing operation at a new scale.

Next, the enlarging/reducing operation of the control means 7 will be explained with reference to the flowchart of FIG. First, in step 11, it is determined whether or not to change the enlargement/reduction, and if it is not changed,
In step 12, it is determined whether reading of the map data has been completed, and if it has been completed, the scale display color is set to a final color in step 13. Next, in step 14, a map is drawn, and in step 15, a scale is drawn. Note that in step 15, the display color can be changed depending on whether the scale display is determined or not. Next, in step 16, the drawing data is sent to the display control means 8.

In step 12, if reading is not completed, the process ends.

If the change of enlargement/reduction is selected in step 11,
In the next step 17, the scale display color is set to an undetermined color, the scale font is set to a new one, and the process moves to the next step 18. In step 18, it is determined whether reading of the map data is continuing or not. If the reading is not continuing, that is, if it has ended, the process moves to step 15, where the scale display color is set to definite and the scale is drawn. If reading is continuing, the reading operation is stopped in step 19,
Proceed to step 20. In step 20, a read operation is started at the new scale, and the process ends.

When changing enlargement/reduction, undetermined/determined display colors are displayed on the display means 9 along with the scaled font at the desired scale.

In this way, according to the above embodiment, the scale display changing means 5
and map data reading/drawing stop means 6, and the display means 9 displays the specified scale and whether or not enlargement/reduction is continuing in color together with the map, so that when the map is enlarged/reduced, , you can quickly set the scale, and if the reading operation has already started,
Since the operation can be stopped, the display of the finally set map can be completed in a short time, and there is an advantage that the target object or target point on the displayed map can be easily and quickly read.

Effects of the Invention As is clear from the above embodiments, the present invention includes a scale display changing means, a map data reading and drawing canceling means,
The scale can be changed quickly when enlarging/reducing, and has the effect that targets on the displayed map can be read quickly.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an on-vehicle map display device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a scale display changing operation of a control means in the same device. DESCRIPTION OF SYMBOLS 1... Direction sensor, 2... Distance sensor, 3... Touch panel, 4... Auxiliary storage means, 5... Scale display changing means, 6... Map data reading and drawing canceling means,
7... Control means, 8... Display control means, 9... Display means. Name of agent: Patent attorney Akira Koeji and two others Figure 1 Figure 2

Claims (1)

[Claims] means for estimating the current position of the vehicle based on the position data from the sensor and the map data from the auxiliary storage means, and displaying the map read from the auxiliary storage means at a specified scale together with its scale; means for changing the scale display; and means for canceling reading and drawing of map data from the auxiliary storage means; when changing the scale, changing the scale display and reading and drawing already at a different scale; An on-vehicle map display device characterized in that, if a map is being performed, that operation is stopped and a readout and drawing operation is performed at a newly designated scale.