JP3391311B2 - Map display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen, a building and a road.
Etc. are displayed three-dimensionally and route guidance lines and / or roads
The present invention relates to a map display device capable of displaying a road information guide line. [0002] 2. Description of the Related Art For example, in a car navigation system
Are disclosed in JP-A-9-171348 and JP-A-9-621.
No. 79, Japanese Unexamined Patent Publication No. 9-212083, etc.
User can intuitively understand the map as described
Display buildings and roads three-dimensionally on the screen.
And has been done. In this case, a car navigation device
When the user sets a destination, the current
Calculate the optimal route at
The route guide line is displayed on the road.
In addition, based on road traffic information obtained by road-to-vehicle communication, etc.
Information on traffic congestion, congestion, vacancies, etc.
Expressed as a line along the road (road information guide line) outside the road
It is also possible to show. [0003]17Has a three-dimensionally drawn map
In addition, a display screen on which route guidance lines are drawn is shown.
This figure173A and 3B, the building 1 is three-dimensional.
It is drawn as a design, and the road 2 has a route guide line 3
(In the figure, a grid-like hatched band portion) is drawn. Real
On the display screen, the entire route guide line 3 is
Road 2 is uniformly painted in a different color (for example, red)
You. Of these,17In the screen shown in FIG.
And route guidance line 3 from near so that perspective can be obtained.
Draw so that the line width gradually becomes thinner as you go far
Have been. [0004] However, the figure17For the screen shown in
Lower the viewpoint altitude to about the height of the vehicle
When the screen is displayed as seen from the line of sight,
You can no longer get a feeling of going, especially at the corner17In
And turn left), the route guide line 3 is hard to see
I will. [0005] In addition, the route guide line 3 includes a building and a road on the screen.
It is drawn after three-dimensionally displayed, so route guidance
Road 2 where line 3 is drawn is hidden by other buildings and roads
And the overlapping part of Road 2 is drawn.
If not (not shown in FIG. 17),
Route guide line 3 overwrites part of building or road
Will be done. As a result, the route guide line 3 and the other building
And the perspective relationship with roads is difficult to grasp or
Unable to recognize three-dimensional shapes of buildings and roads
Inconvenience such as becoming. These circumstances are road conditions.
Information guide line (for example, lane guidance to indicate right or left turn on a road or straight ahead)
Line, traffic congestion information guide line, etc.)
Looks like. [0006] [0007] The present invention has been made in view of the above circumstances.
And thatofThe purpose is to display buildings and roads in three dimensions.
The route guide line and the road information guide line have a perspective
To provide a map display device that can enhance recognition
It is in. [0009] The above object is achieved.
For this purpose, the means described in claim 1 can be employed. This means
According to the display control means,Make the route guide line rectangular
Is displayed on the display unit in a state of being superimposed on a three-dimensional map as a cube.
This route guide line is changed by the switch information input section.
Displayed on the display unit as a visual recognition mode according to the updated viewpoint altitude
Be doneTherefore, set the viewing angle of the screen as low as the height of the vehicle.
Even if specified, the user mustToRecognized
Easy to get a sense of perspective to buildings and roads
Become. [0010] [0011] [0012] [0013] [0014] [0015] [0016] [0017] [0018] [0019] [0020] [0021] [0022] [0023] [0024] [0025] [0026] [0027] [0028] [0029] [0030] [0031] [0032] [0033] [0034] [0035] [0036] [0037] [0038] [0039] [0040] [0041] [0042] [0043] DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, the present invention will be described.
Of a map display device applied to a car navigation device
One embodiment will be described with reference to FIGS.
I will tell. FIG. 1 shows the entire car navigation device 11.
A schematic functional block diagram of the configuration is shown
You. In FIG. 1, the position detection unit 12 is a GPS (Gl
obal Positioning System) Receiver, gyro sensor,
Comprises a vehicle speed sensor and calculates the current vehicle position.
Part. This position detection unit 12 is configured such that
Since there are errors with different characteristics,
It is configured to be usable. In this case,
If it can be calculated, it is not necessary to have all these sensors.
It is sufficient if at least one sensor is provided. The map data storage unit 13 stores the position detection accuracy.
So-called map matching data and map data for improvement
Data and various data including target data
DVD player, hard disk drive,
It is composed of a CD player and the like. With switch information
The force unit 14 (corresponding to the input means in the present invention) will be described later.
Switches installed on the left, right,
It is a kind. The memory unit 15 is, for example, a ROM or a RAM.
The ROM has a car navigation device
11 is stored, and an execution program for operating
AM contains temporary data and map data at program execution.
Map data etc. obtained from the storage section are temporarily stored
It has become. The display unit 16 includes a map and a destination selection screen.
Is displayed, for example, from a liquid crystal display device.
It is configured. The screen is displayed from the position detector 12.
The current position mark of the input vehicle and the map data storage 1
3 and the map data input from 3
Additional data such as route guidance lines and landmarks for target setting points
And are displayed. Audio output unit 17
Outputs voice for guidance and explanation of screen operation. The traffic information receiving unit 18 is provided with a road traffic information system.
For example, VICS (Vehicle Information and Commun
communication system) and installed on the road.
Roads sent from placed radio beacons or optical beacons
Receive road traffic information and road traffic information from telephones and FM broadcasts.
I believe in it. The control section 19 (display control means in the present invention)
Is mainly composed of a microcomputer.
Depending on the operation on the switch information input unit 14
Automatically select the optimal route from the current position to the destination.
Executed the route guidance function to display the route guidance line by selecting
Map matching, synthesis of guidance voice, map drawing
It is designed to perform painting and the like. In this way, automatically
As a method of setting an appropriate guidance route, the Dijkstra method
It has been known. The control unit 19 includes the map data acquisition unit 2
0, map matching unit 21, route calculation unit 22, route plan
Inside 23, drawing unit 24, screen control management unit 25, not shown
Video RAM (hereinafter referred to as VRAM)
Have been. The map matching unit 21 includes the position detecting unit 1
The location information of the vehicle detected in 2 and the map data storage unit 13
Using the road shape data of the map data obtained from
The road on which the current position of the vehicle is located is specified.
At this time, the map data acquisition unit 20 stores necessary map data
Acquired from the figure data storage unit 13. In addition, the user
The user operates the switch information input unit 14 to display a desired map.
And set the destination. In the route calculation unit 22
Is the information of the current position calculated by the map matching unit 21.
Information and the optimal distance between the departure point specified by the user and the above destination
Calculate the best route. In the route guide section 23, the result of the above route calculation
And road shape data stored in the map data,
Route plan based on intersection location information and railroad crossing location information
Calculate the required points within and what route guidance
(E.g., turn right or turn left)
calculate. In the drawing unit 24, a map of the current position and a highway
A rough sketch of the road, an enlarged view near the intersection, etc.
Draws according to the instruction of the surface control management unit 25 and displays it on the display unit 16.
Show. The map data acquisition unit 20 is provided in each of the above processing units.
Obtain necessary map data from map data storage unit 13
Then, it is provided to each processing unit. Each of the above-described processes is
This is executed using the ROM and RAM of the memory unit 15. The map drawn by the drawing unit 24 is a three-dimensional map.
(Hereinafter referred to as a three-dimensional map), which is included in the map data.
Building is tertiary based on stored building shape data and height information
Originally drawn. In addition, road crossings are also used for grade separation.
It is three-dimensionally drawn based on data and the like. Route guidance
Based on the information calculated in step 23, the vehicle advances and guides the route
When the desired position is reached, the desired image is drawn on the drawing unit 24.
The voice output unit 17 outputs a predetermined voice,
To the destination. Next, the operation of the above configuration will be described with reference to FIGS.
4 will also be described. Car navigation by the user
Display the guidance route to the destination on the display unit 16 of the device 11
If desired, the user operates the switch information input unit 14 to display the display unit 1.
A destination selection screen is displayed on 6 to input a destination and the like.
When the input is completed, the route is calculated by the route calculation unit 22,
The control unit 19 controls the route according to the flowchart shown in FIG.
The display process of the guide line is performed, and the display unit 16 displays the information shown in FIG.
As shown in (b), route guidance together with a three-dimensional map
The line is displayed in three dimensions (dots indicating points A to I are
Not shown). That is, FIGS. 4 (a) and 4 (b)
Here, the building 27 is displayed three-dimensionally along the road 26.
The road 26 has a route guide line 28 (in the figure, a grid
(A hatched portion) is displayed three-dimensionally. Where
The grid-like diagonal strips are, for example, uniformly bright red tones
Painted, fine grid-like diagonal stripes are dark colors, for example
It is evenly painted in red tones. This route guide line 28
Is a platform that connects point C, point D, point E, and point F in order.
The shape polygon 29a and the G point, H point, I point, and C point in order
Combined with trapezoidal polygon 29b composed of
It is configured according to. In the drawing method shown in FIG.
The end face of the route guide line 28 is displayed on the near side (the lower side on the screen) of
That the route guide line 28 is bent
From the near side of the road 26 to the far side (upper side on the screen).
Even if it extends straight, the route guide line 28
You can look three-dimensional. Now, a diagram showing the display processing of the route guide line 28 will be described.
In 2, the route guidance unit 23 in the control unit 19
The calculation unit 22 calculates the current position of the vehicle and the input destination.
Roads that need guidance for the guidance route calculated based on
(For example, a unique number assigned to the road to be guided)
You. The location acquired by the map data acquisition unit 20
Compared with the road data information in the figure data, it becomes the same information
A road is extracted (step S1). Subsequently, the control unit 19 determines that the extracted road is
Calculate how far away from the drawing center point of the map
Width to draw the road when performing 3D map display
Is calculated. Here, the drawing center point is the center of the VRAM.
The display unit 16 displays a part of the VRAM.
The cut frame is displayed. And a three-dimensional map
When the display is performed, the width for drawing the route guide line 28 is
The width for drawing the road and the route guidance line 28 are drawing the map
Based on how far away from the center
(Step S2). In step S3, the control unit 19
At this time, the drawing width at both end coordinate points of the route guide line 28 is calculated.
You. FIG. 3 shows, for example, the points C, D, E shown in FIG.
A polygon 29a determined by point F is shown. this
In FIG. 3, the control unit 19 controls the center line N (road line) of the road.
N) The points A and B of the polygon 29a existing on the
The coefficient determined from the distance to the drawing center point
Multiply the width of the road guide line 28 by the length of the line segment CF and the line segment DE
Is calculated. And the route guidance line 28 is a road line
Point A and point B are drawn symmetrically with respect to N.
So that the line segment CF and the line segment DE have a positional relationship that is the midpoint.
Next, the coordinate positions of point C, point D, point E, and point F are determined. Then, the drawing unit 24 converts the polygon 29a
Filled in red by the edge list method or trapezoidal fill method
(Step S4), and then the polygon 29a is
Draw by shifting a certain amount at the bottom of the screen (step S
5). The above processing is performed through the judgment in step S6.
All polygons constituting the road guide line 28 (in FIG.
Gon 29a and 29b)
Thus, the route guide line 28 can be displayed three-dimensionally. As a result, the route guide line 28 shown in FIG.
Consists of two solids corresponding to polygons 29a and 29b
And the solid based on the polygons 29a and 29b as a unit
Thus, the color and the like of the route guide line 28 can be easily changed. Ma
The user operates the switch information input unit 14 to perform the tertiary
It is possible to change the viewpoint height of the original map display
You. In this case, the route guidance line 28 corresponds to the viewpoint altitude.
It is displayed in a visual recognition form. As described above, according to the present embodiment,
When a three-dimensional map is displayed, a part of the route guide line or
Since the whole is displayed three-dimensionally, the user can
Relative position relationship between road guide line 28 and building 27 or road 26
It becomes easier to recognize the person in charge. In particular, it is difficult to see
From the viewpoint altitude about the height of the vehicle
The display portion where the left turn has been made (for example, polygon 29 shown in FIG. 4)
b) also makes it easy to visually recognize the route guide line 28.
You. When the viewpoint altitude is changed, the route guide line 28
It is displayed as a visual recognition mode according to the viewpoint altitude,
A three-dimensional display without feeling is possible. (Second Embodiment) Next, the present invention is described above.
Second applied to the car navigation device 11
An embodiment will be described with reference to FIG. In this FIG.
As shown, when displaying a three-dimensional map,
The indicated building 30 is a road on which the route guide line 28 is drawn.
It is drawn in front of 26, and part of the road 26 is the building 3
0 may be obstructed. The map is displayed in three dimensions
FIG. 5B shows the case where the route guide line 28 is drawn after
As shown in the figure, the overlapping part of the route guide line 28 and the building 30
The route guide line 28 is filled. On the other hand, the car navigation system of the present embodiment
The control unit 19 of the configuration device 11 converts the polygon to a designated color (red
Building 3 stored in map data when drawing in color)
0 shape data, height information, and road 26 position information.
To determine if the polygon overlaps the building
You. When the control unit 19 determines that they overlap,
Is different from its non-overlapping part
Drawing in color (corresponding to display color control in the present invention). In this case, the overlapping portion is drawn in a semi-transmissive state.
Is drawn. That is, for this overlapping part,
For example, the display color of the route guidance line and the display color of the building on VRAM
By alternately setting the pixel unit, the user can use FIG.
As shown in (a), the route guidance line 28 on the screen is the building 30
And can be visually recognized as if it looks thin. This figure 5
(A) Of the route guide lines 28 shown in FIG.
Rendered with the semi-transparent part (the part overlapping the building 30)
It is the part that was done. According to this embodiment, the route guide line 28 and the building
The relative positional relationship with the object 30 becomes clear,
At least the overlap between the road guide line 28 and the building 30
Also, the outer shape of the building 30 can be recognized. Also, this overlapping part
Since the minute is drawn in a semi-transparent state, the route guide line 28
Display without discomfort that can be seen through 30
This makes it possible to recognize the window frames of the building 30, etc.
Becomes clear. Further, in the present embodiment, the route guide line 28
Since the display color control is performed after displaying three-dimensionally,
The visibility of the route guide line 28 is higher. In addition,
The user operates the switch information input unit 14 to display the above information.
Whether or not to execute color control can be selected. (Third Embodiment) Next, a third embodiment of the present invention will be described.
An embodiment will be described with reference to FIG. The car
The configuration of the navigation device 11 is shown in FIG.
It is. When the user operates the switch information input unit 14,
When the VICS display is selected, the control unit 19
Radio beacon signal and optical beacon received by the communication unit 18
Instructions based on the road traffic information included in the signal, such as traffic
Information on delays, congestion, vacancies, etc.
As a line along the road (hereinafter referred to as road information guide line)
Draw on a three-dimensionally displayed map. Conventional VICS table
The display screen is a two-dimensional road information plan as shown in FIG.
It was drawn with extension 31. The control unit 19, as shown in FIG.
As in the first and second embodiments described above, VI
The road information guide line 35 in the CS display is three-dimensionally and built.
The part that overlaps with the object is drawn in a semi-transparent state
I have. Therefore, each of the above-described embodiments is also used in this embodiment.
The same effect as in the above is obtained, and the user can use the VICS display.
It is easy to recognize traffic congestion, congestion, vacancy information, etc. (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described.
An embodiment will be described with reference to FIG. This embodiment
Means that the control unit 19 is a convenience store
And three-dimensional display of facilities such as
The feature is that display control for displaying the facility identification mark is performed.
are doing. Conventionally, such facilities are shown in FIG.
As shown in the two-dimensional facility mark 32
When the viewpoint altitude is set low, the user
It was difficult to see these facilities on the surface. On the other hand, the control part 19
As shown, these facilities 33 are drawn as cubes,
Indication that displays a facility identification mark on each surface of the facility 33
Control is performed. And draw on that cube
The facility 33 is located according to the viewpoint height set by the user.
Since it is drawn in the visual recognition form, the viewpoint from the height of the vehicle
Even if it is displayed with, visibility will be high,
The facility identification mark can be recognized regardless of the viewpoint position.
Wear. Further, the control unit 19 is provided with a control unit as shown in FIG.
As shown in FIG.
At the side corresponding to the direction where the entrance is provided
indicate. As a result, in addition to the facility identification mark,
The facility 34 can be identified from the direction of the entrance of
Layer visibility is improved. The user stands at the facility 34.
Check the parking position of the vehicle in advance, such as when approaching
The convenience can be improved. (Fifth Embodiment) Next, a fifth embodiment of the present invention will be described.
An embodiment will be described with reference to FIGS.
You. In the fifth embodiment, the control unit 19 displays one side on the map.
Traffic and speed regulation, under construction and parking and parking prohibition, rock fall warning, etc.
Alternatively, traffic regulations such as "in traffic" obtained from VICS
Control information is displayed. These traffic regulations
The traffic control information includes, for example, one-way traffic, no entry, and speed regulation.
Are displayed with the same design as the traffic sign, but the map is tertiary.
When the original display is used, those display designs use polygons.
Rendered using That is, as shown in FIG.
In this case, the design of the sign
It is drawn by the gon 36. The display design is configured in this way
Then, for example, in the three-dimensional display, the viewpoint position is set as a reference.
To display a sign in the vicinity and to display it in the distance
In comparison with the case where it is configured using bitmap data.
As a result, the display quality hardly deteriorates. FIG. 13 shows a conventional example for comparison.
Shows an example of drawing a display design using bitmap data.
I have. In this case, the display is used as a reference near the viewpoint position.
If you want to double the size from the size (1 time)
Means that one dot is displayed as 2 × 2 4 dots.
You. Therefore, the outer shape of the circle becomes coarse and
Display. Conversely, it is displayed small at a distance
If you do, you will have to skip data,
Occurs. On the other hand, drawing using the polygon 36
To enlarge or reduce the displayed image, use each vertex of the polygon.
It is only necessary to change the interval between coordinates indicating
No need for padding. Therefore, as shown in FIG.
In addition, even if the display is twice as large,
It can be expressed smoothly in dot units. Further, as shown in FIG.
Even if the line direction is changed from the front to 90 degrees, the angle
Displays signs so that they look naturally elliptical according to the degree of change
Design can be composed. In such a case, the bitmap data
Data, the data in the display column can be used to draw a thin ellipse.
It is necessary to draw a lot of data, and the display quality of the curve
Will be greatly reduced. On the other hand, polygon
With 36, elliptical curves can be drawn with fine dots.
Display quality compared to bitmap data
Can be increased. FIG. 8 shows that the control unit 19 displays traffic regulation information.
Control contents when displaying with the map on the screen of the unit 16
It is a flowchart which shows. The control unit 19 firstly uses
There is no setting for 3D display (3D display) by the user
(Step A1), and if there is no setting, "N
O ”and the map data acquisition unit 20 determines
The map data obtained from the storage unit 13 is displayed in a plane (2D table).
(Step A2). In step A1, three-dimensional display
If there is a setting of ""
3D display data of the map data acquired by the acquisition unit 20
(Step A3). In that case,
Altitude (ie, map display scale) of the current viewpoint and road
Conversion so that it becomes a three-dimensional display according to the line of sight
Do. Subsequently, the control unit 19 includes the
For displaying each traffic regulation information on a signboard
Is obtained via the map data acquisition unit 20 (step A
4), a process of determining whether or not to draw them on the signboard display
Perform (Step A5). Note that the signboard display is, for example, FIG.
At a predetermined height from the ground on the map as shown in Fig. 4,
3D display of traffic regulation information design (that is, according to viewpoint position)
Display with a changing design). Then, the control section 19 proceeds to step A5.
Display unit based on the determination result in
The map data is three-dimensionally displayed on the screen 16 (step A).
6). Then, there is a change to the two-dimensional display by the user.
Judge whether or not there is, and if there is a change, go to step A2.
If there is no change, the process proceeds to step A3. FIG. 9 shows a drawing determination process in step A5.
It is a flowchart which shows the control content of a process. In this FIG.
In this case, the control unit 19 controls the map to be drawn.
Determine if traffic regulation information is included in the data
(Step B1) If included, the current three-dimensional table
Depression angle set as indicated viewpoint position (see FIG. 10)
Is within a predetermined angle (for example, 50 degrees) or not,
In addition, the traffic regulation
The angle at which the control information is displayed at an angle (see FIG. 11) is a predetermined angle.
Judge whether it is within the degree (for example, within ± 80 degree)
(Steps B2 and B3). It should be noted that in FIG.
Above shows the angle formed by the line of sight with respect to the front of the display.
However, it is a relative expression and is substantially the same. Control in any of steps B2 and B3
If the part 19 determines "NO", the traffic regulation information is 2
Dimensions are displayed (step B5), and steps B2 and B3
If the control unit 19 determines “YES” in both cases, the traffic
The regulation information is displayed three-dimensionally (signboard display) (step B).
4). That is, for example, as shown in FIG.
There is a right turn road in front of you, and that road is prohibited
It is assumed that a sign (traffic regulation information) 37 is displayed.
(In addition, unlike FIG. 14, etc., the display of the support is omitted.
). In this case, if the viewpoint position is relatively low (FIG. 12)
(See (a)), the user displays the sign 37 even if the sign is displayed.
You can see it. However, as shown in FIG.
When the viewpoint position is relatively high as shown in FIG.
Is an extremely thin ellipse as shown by the broken line in the figure.
This makes it extremely difficult for the user to recognize.
Therefore, in the case as shown in FIG.
The user can easily recognize the sign 37 by attaching the design
Will be able to As described above, according to the fifth embodiment, the table
A predetermined height from the ground on the map in the screen of the indicating unit 16
Then, the design showing the traffic sign 37 is three-dimensionally drawn using polygons.
Display, so that bitmap data
Display quality higher than designs drawn
You. Therefore, the user can more easily recognize the traffic sign.
Therefore, safer driving can be performed. Also,
Display of the design in a visual recognition mode according to the viewpoint position of the screen display
Therefore, the traffic sign 37 should be displayed in a three-dimensional display without a sense of incongruity.
Is possible, and the user can operate regardless of the set position of the viewpoint.
It becomes easier to recognize traffic signs. Further, according to the fifth embodiment, the viewpoint position
If the angle of depression from the vehicle exceeds a predetermined angle, or traffic sign 3
When the line-of-sight direction angle with respect to
Switch the design showing the sense 37 from 3D display to 2D display
So the depression angle or gaze direction angle is relatively large
Even if the traffic sign 37 is valid from any point on the road
Or indicate traffic sign 37 itself
Can be. (Sixth Embodiment) Next, a sixth embodiment of the present invention will be described.
An embodiment will be described also with reference to FIGS.
You. In the sixth embodiment, the control unit 19 operates as shown in FIG.
Thus, on the map displayed on the screen of the display unit 16,
At the same time as displaying a traffic sign 37 of no entry,
Secondary design (“x” and arrow) 38 that means no entry
The original display is used. FIG.
Like the traffic sign 39 indicating a speed limit of 40 km
With the signage, the design of the same purpose ("40" and arrow
This is an example of a two-dimensional display of the mark 40). That is, as described above, the screen of the display unit 16
Two-dimensional and three-dimensional designs that mean one piece of traffic regulation information
If you display both in the form of
The line of sight changed, making it difficult to see the 3D sign
In some cases, information can be supplemented by a two-dimensional display design.
it can. And, unlike the fifth embodiment, a three-dimensional table
It is necessary to judge which of two-dimensional display and two-dimensional display to select
In addition, the processing load on the control unit 19 can be reduced. (Other Embodiments) The present invention relates to each of the above embodiments.
It is not limited to the embodiment, but may be modified or
Is extensible. Route guide line 28 is cuboid or cube
You may draw as. Also, a three-dimensional route guide line 28
A three-dimensional arrow may be added to the tip of the. [0091] Also, a lane plan indicating a right turn or a left turn on the road or going straight.
As for the extension, three-dimensional display (standing
(Displayed physically). In the second embodiment, the route guide line 28
For the part where the building 30 and the building 30 overlap, the route guide line 28
May be controlled so as not to be drawn. In addition, route guidance line
If 28 passes on the road under the flyover or in a tunnel
It can be drawn in the same way when passing inside
It becomes. In the fourth embodiment, facilities are cuboids or cylinders
May be drawn with
Is also good. Further, the traffic light may be displayed in three dimensions. In the fifth or sixth embodiment, the three-dimensional
Traffic regulation information is not limited to traffic signs,
"Traffic closure due to accident" and "Traffic 1
0km "," 60km regulation for rain ", etc.
No. Lowering the viewpoint position to switch from signboard display to flat display
The size of the angle or the angle of the line of sight direction should be changed as appropriate.
Just do it. In the sixth embodiment, for example,
The sign "Stop" is displayed on the signboard, and
"One way" by the arrow opposite to 15
May be displayed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram schematically showing an overall configuration of a first embodiment of the present invention. FIG. 2 is a flowchart showing a display control process. FIG. FIG. 5 is a diagram showing a screen displayed three-dimensionally. FIG. 5 is a diagram (a) showing a second embodiment of the present invention, and FIG. 6 (b) is a comparative diagram. FIG. 6 is a diagram showing a third embodiment of the present invention. FIG. 4 (a) and FIG. 7 (b) and FIG. 7 (a) and FIG. 7 (b) and a comparative diagram (c) showing a fourth embodiment of the present invention. FIG. 9 is a flowchart showing a process of displaying traffic regulation information three-dimensionally. FIG. 9 is a flowchart of a drawing determination process. FIG. 10 is a diagram showing a depression angle from a viewpoint position. FIG. FIG. 12A shows a screen display when the depression angle is relatively small. FIG. 13B shows an example of a screen display when the depression angle is relatively large. FIG. 13 is a diagram showing an example of a case where the size of a traffic sign drawn using polygons is changed. FIG. 15 is a view showing a state in which the design of a traffic sign by a signboard is changed when the display is changed. FIG. 15 is a view corresponding to FIG. 12 showing the sixth embodiment of the present invention (No. 1). FIG. (No. 2) FIG. 17 is a diagram corresponding to FIG. 4 by a conventional drawing method [Description of References] 11 is a car navigation device (map display device), 14
Is a switch information input unit (input means), 19 is a control unit (display control means), 18 is a traffic information receiving unit (road information receiving means), 26 is a road, 27 and 30 are buildings, 28 is a route guide line, 33 , 34 are facilities, 35 is a road information guide line, 36 is a polygon, 37 is a traffic sign (traffic regulation information), 38 is 2
A three-dimensional display design (traffic regulation information), 38 is a traffic sign (traffic regulation information), and 39 is a two-dimensional display design (traffic regulation information).

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takashi Ichida 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation (56) References 143066 (JP, A) JP 10-253380 (JP, A) JP 10-300499 (JP, A) JP 10-332396 (JP, A) JP 9-91600 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) G01C 21/00 G08G 1/0969 G09B 29/00 G09B 29/10

Claims (1)

(57) [Claim 1] In a map display device applied to a car navigation device capable of displaying a route guide line while displaying a building, a road, etc. three-dimensionally on a screen, the route guide line is displayed. Display control means for displaying on the display unit in a state of being superimposed on the three-dimensional map as a rectangular parallelepiped or a cube; and a switch information input unit capable of changing a viewpoint height of the three-dimensional map display, wherein the route guide line is The map display device is displayed on the display unit as a visual recognition mode according to a viewpoint altitude changed by the switch information input unit.