KR100213758B1 - Map display method for car navigation system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a map display method of a car navigation system, and more particularly, to a map display method of a car navigation system for scrolling a map screen in accordance with movement of a car.

Therefore, according to the present invention, the coordinates of the current position point of the vehicle are collected and displayed on the display screen after the coordinates are matched with the road map data, and the map screen is moved in a predetermined direction from the current position according to the selection of the scroll key of the driver (B) checking the scroll direction if the driver has selected a scroll key to move the map screen in a predetermined direction, (c) Changing the map display start address to an address in the memory in which the new road map data in the scroll direction checked in the step is stored and updating the road map data, (d) updating the road map data updated from the changed map display start address And displaying the image on the display device.

Description

How to display map screen of car navigation system

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a map display method of a car navigation system, and more particularly, to a map display method of a car navigation system for scrolling a map screen in accordance with movement of a car.

In recent years, the increase in the number of vehicles on the road has caused very large traffic congestion. Such traffic congestion is even more serious in large cities, but there is a demand for resources that can not be afforded to expand road networks due to the astronomical rise of land prices. Therefore, as a more practical solution, an attempt is made to efficiently control the traffic flow by using the existing road network as it is, but using an artificial intelligent system. As one of the methods, a car navigation system This is under development. The most basic function of this vehicle navigation system is to track the position of the vehicle in operation and accurately display it on the road map. The auxiliary function is to grasp the traffic situation on other roads, provide useful information on gas stations, Function.

Such a car navigation system includes a stand-alone navigation system that employs a plurality of sensors and tracks vehicle positions using information provided from the sensors, a batting navigation system that uses position information provided by a GPS satellite, System, and the hybrid vehicle navigation system described below represents a hybrid navigation system.

As shown in FIG. 1, the configuration and operation of the general car navigation system are composed of a GPS receiver 13 for receiving the radio waves simultaneously from three different Global Positioning System (GPS) satellites 15 and calculating the longitude and latitude of the point And then the calculated current position is matched on the road map extracted from the map data storage unit 12 storing the road map data, and then the display control unit 17 on the display unit 18 implemented by an LCD or the like to visually guide the driver to the current position and the traveling direction of the vehicle. In this automatic navigation system, the user can enlarge and reduce the road map displayed on the display device 18 through a predetermined key operation provided on the key input unit 16. At the same time, the user can set the current position and the destination of the vehicle, And a key for scrolling the map screen.

In this automatic navigation system, the temporary storage unit 19 stores the map data corresponding to the map screen displayed on the screen of the current display unit 18, Similarly, a map 1 divided into nine regions is displayed on the screen of the display unit 18, and the temporary storage unit 19 stores current map data for each region. On the other hand, if the vehicle travels to the boundary point on the current display screen, for example, to the boundary point of the area M (m + 1, n), the next map screen 2 including M (m + It is necessary to update the data stored in the temporary storage unit 19 so as to display the map data on the nine regions from the map data storage unit 12, Read and save.

However, in the conventional map display method of the conventional car navigation system, when the vehicle deviates from the boundary surface of the map displayed on the display screen, as shown in Fig. 2, The data stored in the current temporary storage unit 19 are erased from all the data of the shaded area 2 and the data of the shaded area 2 in FIG. 2 is newly stored in the temporary storage unit 19. At this time, (1) and the map screen (2) for the hatched part are overlapped map data.

Accordingly, the time required to read the screen when the map screen is scrolled is increased because the data stored in the temporary storage unit 19 is updated in spite of the existence of the overlapped data, And the like.

Accordingly, it is an object of the present invention to solve such a problem, and it is an object of the present invention to effectively update the map screen data stored in the temporary storage unit when the map screen is scrolled, thereby reducing the time for changing the display screen at the time of scrolling the screen, It is an object of the present invention to provide a method of displaying a map screen of a car navigation system capable of preventing gumbling on the screen.

1 is a control block diagram showing a configuration of a general car navigation system.

2 is a diagram showing a storage form of road map data according to an embodiment of a general car navigation system.

3 is a diagram showing a form of road map data in a general car navigation system.

4 is a flowchart showing a map screen display method of the car navigation system according to the present invention.

Description of the Related Art [0002]

10 ... automatic navigation control unit, 11 ... map storage control unit,

12 ... map data storage unit, 13 ... GPS receiver,

14 ... GPS antenna, 15 ... GPS satellite,

16 ... key input section, 17 ... display control section,

18. indicator, 19 ... temporary storage.

In order to realize this object, a method of displaying a map screen of a car navigation system according to the present invention is a method of displaying coordinates on a current position point of a car, aligning it with a road map data and displaying it on a display screen, (A) determining whether a driver's scroll key is selected; (b) determining whether the driver has selected a scroll key in a predetermined direction by moving the map screen in a predetermined direction; A step of checking the scroll direction when the scroll key is selected, (c) changing the map display start address to the address in the memory where the new road map data in the scroll direction checked in the step is stored, and updating the road map data (D) displaying the updated road map data from the map display start address changed on the display device It is characterized in that it includes the steps:

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a control block diagram illustrating a configuration of a vehicle navigation system according to the present invention. As shown in FIG. 1, the car navigation system according to the present invention includes a GPS receiver 13 for receiving radio waves simultaneously from three different global positioning system (GPS) satellites 15 and calculating the longitude and latitude of the points, A map data storage unit 12 storing road map data, and a map data storage unit 12 for processing the longitude and latitude data received by the GPS receiver 13, A correlation between the trajectory of the vehicle traced from the GPS satellite 15 and the road map data provided from the map data storage unit 12, A map storage control unit 11 for correcting and calculating the position of the vehicle on a high road and providing it to the automatic navigation control unit 10 and an indicator for visually displaying an optimal road map to the current position and destination of the vehicle A display control unit 17 for controlling the driving of the display unit 18 under the control of the automatic navigation control unit 10 and a display control unit 17 for displaying the map data, A temporary storage unit 19 for temporarily storing data to be displayed on the display unit 18, a key input unit 19 for selecting a desired portion map, setting an initial point on which the car is currently positioned, (16).

In this configuration, the key input unit 16 is provided with an enlargement / reduction key of a map screen, a scroll key for moving the map screen back and forth or left and right, and a reset key for resetting the system when the system is inoperable .

On the other hand, the map data in the car navigation system according to the present invention is stored in a map data storage unit 12, which is preferably implemented as a compact disc ROM (CD-ROM) The geographical information required for road running and road management is digitized (digitized) by two-dimensional coordinate values of (x, y) and stored. These numerical maps are arranged in the reference area meshes, that is, the third meshes. Here, the third meshes are defined as the first meshes (approximately 80 km in length and breadth) ), And then divides the first mesh into eight equal parts to make a second mesh (approximately 10 km in length and breadth), and then divides the second mesh into ten equal parts to obtain a local unit (approximately 1 km in length and breadth).

The third mesh meshes have an actual coordinate system and are distinguished by unique coordinate values. As shown in FIG. 3, the third mesh meshes are digitized based on the coordinate axes, converted into indexes and data, and connected in a corresponding manner. The index has a reference coordinate value of the partitioned area and a size value for the feature, the water system, the road, and the like in the area.

A method of displaying a map screen of a car navigation system according to the present invention having such a configuration will be described in detail below with reference to FIGS. 3 and 4. FIG.

First, FIG. 4 is a flowchart showing a map display method according to the present invention. As shown in FIG. 4, when the car navigation system starts to operate, a position of a vehicle is obtained by receiving a radio wave from a GPS receiver 13 , The map data corresponding to the current position of the car is read from the map data storage unit 12, and the position of the car is matched on the map screen on the display unit 18 to visually display the map data (step S10). At this time, the temporary storage unit 19 of the indicator control unit 17 stores the map data of the area where the current car is read from the map data storage unit 12. At this time, the map display start address of the stored map data is, for example, It is assumed that the uppermost address of the area M (i, j) in FIG. 3 is set.

At this time, if it is determined that the scroll key is input by the driver (step S12), the direction of movement of the map screen by the selection of the scroll key is determined (step S14). At this time, if it is determined that the driver operates the scroll key to move the screen downward, it is determined whether the map screen area of the display screen, that is, the map screen of the maximum 9 display areas, is exceeded (step S16).

If it is determined in the determining step that the driver has operated the scroll key to exceed the maximum screen area displayed on the display device, the automatic navigation controller 10 displays a newly added map screen on the display device 18, And changes the map display start address of the map display section 19 (step S18). 3, the automatic navigation control unit 10 changes the map display start address of the temporary storage unit 19 from the address M (i, j) to the address value of the area M (i, j + 1) And changes the address value of the corrected other area (step S20).

Accordingly, when the display controller 18 intends to display the changed map screen on the display device 18, the display controller 18 reads the map data from the map display start address of the changed temporary storage 19 and displays the read map data on the display device 18 Step S22).

Thus, in the method of displaying the map screen of the car navigation system according to the present invention, the map display start address can be changed without updating all the map data stored in the temporary storage unit 19 of the display controller 17 at the time of scrolling of the map screen The changed map screen can be outputted on the display device.

As described above, according to the map display method of the car navigation system according to the present invention, it is possible to quickly output a new screen changed at the time of scrolling of the map screen on the display screen, There is an advantage that it can eliminate the gumbling phenomenon.

Claims (1)

A GPS receiver 13 for receiving the waves from three different GPS satellites 15 at the same time and calculating the longitude and latitude of the spot and a map data storage 12 for storing road map data, An automatic navigation control unit 10 for processing the longitude and latitude data received by the GPS satellite 15 to match the present witch of the vehicle with the map data provided from the map data storage unit 12, Calculates the correlation between the driving trajectory of the vehicle and the road map data provided from the map data storage unit (12), corrects the position of the vehicle on the road with the highest correlation and provides it to the automatic navigation control unit A display unit 18 for visually displaying an optimal road map to a current position and a destination of the vehicle and a display unit 18 for controlling the driving of the display unit 18 under the control of the automatic navigation control unit 10. [ A temporary storage unit 19 for temporarily storing the map data so that the current position of the vehicle can be displayed on the display unit 18 by the display controller 17, And a map input unit 16 for setting an initial point and a direction to which the vehicle is currently positioned on the map displayed on the map input unit 16, A method of displaying a map screen of a car navigation system in which a screen is displayed in front, rear, left and right directions, When the driver operates the scroll unit of the key input unit 16, the automatic navigation control unit 10 determines whether the maximum screen area exceeded the maximum screen area of the map screen displayed on the display unit 18 Step S16; If it is determined in step S16 that the maximum value is less than the maximum value, the map data is not updated in all nine screen areas of the map screen displayed on the display device 18, 18, the automatic navigation control unit 10 includes a start address change unit S18 for changing the start address of the map display of the map data temporarily stored in the entrance storage unit 10; If the starting address of the map display is changed by the starting address changing step S18, the automatic navigation control unit 10 sets the changed starting address of the map display to the top address of the map screen displayed on the display unit 18, A map screen area modification step (S20) of changing an address value of each area; And When the address value of each area of the map screen is changed by the map screen area modifying step (S20), the automatic navigation controller 10 controls the display controller 17 to change the address value of the map screen, (S20) of displaying the map screen on the display device (18) by reading out the map screen (19) from the map display screen (s20).