JPH06236146A - Map display device for vehicle - Google Patents

Abstract

PURPOSE:To provide a device which can change a display screen in accordance with variation of surrounding brightness in driving of a vehicle without degrading discrimination characteristic of a road displayed on a display device and its classification. CONSTITUTION:In a navigation device which guides a driving vehicle by displaying a road map on a display device, when a command for changing a background color of a displayed map is inputted (110:YES), a background color mode corresponding to the command is read (130), when the background color mode is standard, background color data is changed to the initial value (150), when the background color mode is not standard, background color data for darkening the background color more than the initial state is operated based on the initial value of background color data and corresponding to the background color mode (160), background color data used for display is rewritten (170), and a displayed map is changed. Consequently, when a vehicle drives on a dark road, only background of the displayed map can be darkened, and a road map can be made easy to see without degrading discrimination characteristic of a road and a railway and the like constituting the road map.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle map display device for displaying a road map on a display device such as a CRT or a liquid crystal display.

[0002]

2. Description of the Related Art Conventionally, in a so-called navigation device for guiding a driver of a current position of a vehicle, a travel route, etc., a display device displays a road map including the current position of the vehicle, and the vehicle is displayed on the map. The current position of the vehicle, the traveling route, etc. are displayed in a distinguishable manner.

Further, such a navigation device has
A CDROM reader is provided, and the CDROM reader is used to read out map data and color data of an area to be displayed on the display device from a commercially available CDROM in which map data representing a road map is stored together with display color data. There is a display device which displays a road map based on the read data.

[0004]

However, in the commercially available CDROM, the color data for road map display is
It is preset according to the type of road, railway, etc., and its background color is also fixed, so if you use this color data as it is to display a road map on the display device,
When the vehicle is driving on a dark road at night, in a tunnel, etc., the display screen is too bright, and after the driver looks at the display screen,
When we turned our eyes to actual roads, the roads became difficult to see, and the driving safety of the vehicle decreased.

On the other hand, these problems can be solved by changing the color tone by adjusting the brightness and color tone of the display screen, or by inverting the display color and changing the display color itself. , There is also a device with such an adjustment function added.

However, when such an adjustment is performed, the entire display screen changes in accordance with the adjustment, which makes it difficult to identify the road, or the road which should have been originally specified by the type. There is a problem that the type of road is not known because the color changes.

The present invention has been made in view of these problems, and a display screen is displayed according to a change in ambient brightness while the vehicle is traveling, without deteriorating the distinguishability of roads and road types displayed on the display device. An object of the present invention is to provide a changeable vehicle map display device.

[0008]

The present invention, which has been made to achieve the above object, has a display device for displaying a road map and map data representing the road map, as shown in FIG. The map data storage medium stored together with the display color data including the background color is detachably mounted, and the map data and the color data for displaying the road map of a predetermined area on the display device from the map data storage medium. A map data reading unit for reading the data, and a display control unit for displaying a road map in a display color corresponding to the color data on the display device based on the map data and the color data read by the map data reading unit. In the vehicle map display device, a change command input means for inputting a command to change the background color of the road map displayed on the display device from the outside,
When a background color change command is input from the change command input means, the display control means corrects or changes the color data representing the background color of the road map among the color data used for displaying the road map. The background color of the road map displayed on the display device or the background color changing means for changing the color tone of the background color is provided.

[0009]

In the vehicle map display device of the present invention configured as described above, the map data reading means stores map data representing a road map together with display color data including the background color of the road map. A map data storage medium is detachably attached. Then, the map data reading means reads the map data and the color data for displaying the road map of the predetermined area on the display device from the mounted map data storage medium, and the display control means reads the read map. A road map is displayed on the display device based on the data and the color data.

Further, the vehicle map display device of the present invention is provided with change command input means for inputting a change command of the background color of the road map displayed on the display device, and via this change command input means. When a background color change command is input from the outside, the background color changing unit corrects or changes the color data representing the background color of the road map among the color data used by the display control unit to display the road map. By doing so, the background color of the road map displayed on the display device or its color tone is changed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 2 is a block diagram showing the overall configuration of a vehicle navigation device of an embodiment to which the present invention is applied.

As shown in FIG. 2, the navigation system according to the present embodiment has a GPS antenna 2 for receiving radio waves transmitted from a GPS (Global Positioning System) artificial satellite.
a, frequency-converts and demodulates the received signal to calculate latitude data, longitude data, and altitude data representing the position of the receiving point (that is, vehicle position), and at the same time, calculates the moving speed (that is, vehicle speed) of the receiving point. Well-known GPS that calculates velocity data
A receiver 2, an input device 4 as a change command input means including various key switches for inputting various data such as an intersection position forming a traveling route and a background color change command of a road map by an external operation, and an input device 4 in advance. Read the map data for display from a commercially available CDROM that stores the map data,
A CDROM reader 6 as a map data reading means, an alarm device 12 for issuing an alarm to the driver when the vehicle deviates from a planned traveling route while the vehicle is traveling, a road map including the vehicle position and various messages are displayed. CRT to do
Various data are read from the display device 14 including a liquid crystal display, the GPS receiver 2, the input device 4, the CDROM reader 6, etc., and a road map is displayed on the display device 14 based on the data, and various alarms are issued from the alarm device 12. And a control device 20 for generating.

The control unit 20 includes a CPU 22 and a ROM.
24, RAM 26, input / output port 28, and a well-known microcomputer provided with a bus line 30 connecting these parts. The alarm device 12 and the display device 14 are connected via the alarm drive device 32 and the display drive device 34. Drive each.

Here, in the CDROM from which the CDROM reader 6 reads the map data, in addition to the map data showing the position and shape of each part constituting the road map such as roads, railways, buildings, etc.,
Display data for displaying these units on the display device 14 is stored. As shown in FIG. 3, this display data includes line data (line) representing the thickness and shape of the line,
It is composed of surface data (paint) representing the pattern of the area surrounded by the line data, and color data (palette) representing the display color, which is composed of the respective color levels of red R, green G, and blue B which are the three primary colors for display. It is preset for each type of road, type of railway, and type of building on the map. Further, in the display data, plane data and color data for displaying the background of the road map are also set.

Then, when the vehicle driver inputs a guidance command for a traveling route via the input device 4, the control device 20 controls a predetermined area including the vehicle position detected by the GPS receiver 2 in accordance with the command. The map data is read from the CDROM via the CDROM reader 6, and a process as a display control means for displaying a road map on the display device 14 is executed on the basis of the read map data and the display data. To highlight the vehicle position. At this time, if the vehicle driver has already set the planned traveling route of the vehicle, the road that is the set planned traveling route is highlighted on the display map.

When the input key for the background color change command provided on the input device 4 is operated when the road map is displayed on the display device 14 as described above, the control device 20 functions as a background color changing means. Execute processing (background color change processing),
The background color of the road map displayed on the display device 14 is changed.

The background color changing process will be described below with reference to the flowchart shown in FIG. As shown in FIG. 4, the background color changing process is executed by the CPU 22 as a timer interrupt process at predetermined time intervals. When the process is started, first in step 110, the process is executed last time. Then, it is determined whether or not a background color change command is input from the input device 4. If the background color change command is not input, the process proceeds to step 120,
This time, it is determined whether or not the display map change request is generated due to the change of the vehicle position accompanying the traveling of the vehicle.

In other words, in the navigation system of this embodiment, when the vehicle position moves toward the corner on the display map as the vehicle travels, the navigation route is hindered. Since a request for changing the displayed map is issued from a highlighting processing side (not shown) for highlighting the vehicle position on the displayed map, in step 120, such a request for changing the displayed map is currently made. It is determined whether or not it has occurred.

When it is determined in step 120 that the display map change request has not been issued, there is no need to change the display map, and the process ends. On the other hand, if it is determined in step 110 that a background color change command has been input, or if it is determined in step 120 that a display map change request has been issued, the process proceeds to step 130 and the current setting is set. Load the background color display mode (background color mode).

In this embodiment, the background color mode is set as shown in FIG.
As shown in FIG. 4, a total of four modes, that is, a standard mode in which the color data of the background color read from the CDROM is used as an initial value as it is and three night modes, are preset, and a background color change command is issued from the input device 4. Is entered,
By a key input interrupt process (not shown), the background color mode is sequentially changed in the order of standard mode → night mode 1 → night mode 2 → night mode 3 → standard mode.

Therefore, if it is determined in step 110 that the background color change command is input, the background color mode corresponding to the change command is read in step 130, and a map change request is generated in step 120. If it is determined that the background color mode corresponding to the road map currently displayed on the display device 14 is read in step 130.

As described above, when the currently set background color mode is read in step 130, the process proceeds to step 140, and it is determined whether the background color mode is the standard mode. Then, when it is determined in step 140 that the background color mode is the standard mode,
In step 150, the background color data (initial value) read from the CDROM is set as the background color data (background color data) used for displaying the road map,
Go to step 180.

On the other hand, if it is determined in step 140 that the background color mode is not the standard mode, the process proceeds to step 160 and the current background color mode (night mode 1, 2,
The background color data corresponding to 3) is calculated, and step 170
Then, the background color data used for displaying the road map is changed to the calculated background color data, and the process proceeds to step 180.

In step 160, when the background color mode is the night mode 1, the R, G, and B color levels forming the color data of the background color read from the CDROM are uniformly reduced. , Background color data for changing only the brightness (brightness) of the background color from the initial state is set, and when the background color mode is the night mode 2, the background color is preset to be dark gray. Background color data is set and the background color mode is night mode 3
, The color levels of red R, green G, and blue B constituting the color data of the background color read out from the CDROM are 1 / r, 1 / g, 1 / b (however, r, g , B are constants different from each other), the background color data for changing the brightness and color of the background color based on the initial state is set.

Then, in step 180, step 1
50 or the display map is changed with the background color data for display set in step 170, and the process ends. By the processing of step 180, step 110
If it is determined that the background color change command has been input in step S1, it is determined that only the background color in the display map has been changed according to the background color data, and a request to change the display map has been issued in step 120. If determined, the display map itself is changed according to the vehicle position.

As described above, in the present embodiment, by operating the input device 4 to input the background color change command, the display mode of the background color of the displayed map and the background color of the displayed map are set to the CDROM. The standard mode set to the initial value stored in, the night mode 1 to set the background color to the background color with only the initial brightness reduced, the night mode 2 to set the background color to dark gray, the background color and its brightness It can be set to any of night mode 3 in which the background color is changed based on the initial value.

Therefore, when the vehicle is traveling on a dark road such as at night or in a tunnel, the road map displayed on the display device 14 is operated by operating the input device 4 as shown in FIG. 6) can be changed to a display state in which only the background of the map is darkened, as shown in FIG. 6B, without deteriorating the distinguishability of each part constituting the road map such as roads and railways. The road map can be made easier to see and the traveling safety of the vehicle can be improved.

[0028]

As described above, according to the vehicle map display device of the present invention, by operating the change command input means, the road map, the road, the railroad, etc. in the road map displayed on the display device can be displayed. It is possible to change only the display state of the background without changing the display state of each part. Therefore, at night,
When the vehicle is traveling on a dark road such as in a tunnel, the road map can be made easy to see without lowering the distinguishability of the road and its type, and the traveling safety of the vehicle can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of the present invention.

FIG. 2 is a block diagram showing the overall configuration of the vehicle navigation device of the embodiment.

FIG. 3 is an explanatory diagram showing road map display data stored in a CDROM.

FIG. 4 is a flowchart showing a background color changing process executed by the control device 20.

FIG. 5 is an explanatory diagram illustrating a background color mode set according to a background color change command.

FIG. 6 is an explanatory diagram showing a change in a displayed map due to a background color changing process.

[Explanation of symbols]

2 ... GPS receiver 4 ... Input device 6 ... CDROM
Reader 14 ... Display device 20 ... Control device 22 ... CPU

Claims (1)

[Claims] 1. A display device for displaying a road map, and a map data storage medium which stores map data representing the road map together with display color data including a background color of the road map are detachably mounted. Map data reading means for reading map data and color data for displaying a road map of a predetermined area on the display device from the map data storage medium, and based on the map data and color data read by the map data reading means, A display control means for displaying a road map in a display color corresponding to the color data on the display device, and a map display device for a vehicle comprising: a command for changing the background color of the road map displayed on the display device. When the change command input means for inputting from the outside and the background color change command is inputted from the change command input means, the display control means is used for displaying the road map. Background color changing means for correcting or changing the color data representing the background color of the road map among the above-mentioned color data to change the background color of the road map displayed on the display device or the tone of the background color. And a map display device for a vehicle.