JP2000329566A - Car navigation system and method for displaying screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a display screen of a car navigation system easy to see even during running at night and prevent the display screen from obstructing driving. SOLUTION: A GPS receiver 1 has an observation point position obtaining part 11 for obtaining a position of an observation point, and an year, month, day and time obtaining part 12 for obtaining time. A microprocessor 3 has a display position/luminance calculation process part 31 which obtains a longitude, a latitude and an azimuth of the observation point from the observation point position obtaining part 11 and time information from the year, month, day and/time obtaining part 12, and carries out calculations, and a display effect calculation process part 32 which processes display position/luminance data for thereby obtaining display object data. An external memory device 2 has a display object obtaining part 21 for obtaining data related to a display object, and inputs the display object data to the display effect calculation process part 32. A part of a lower necessity on a screen can be set to be dark as compared with a part of a higher necessity, thereby making it possible to designate parts of the higher necessity and lower necessity on the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car navigation system and a screen display method thereof, and more particularly, to a car navigation system and a screen display method that make it easy to see a screen.

[0002]

2. Description of the Related Art In a conventional car navigation system, a system corresponding to night driving includes a system for lowering the brightness of a display screen at night or a system for switching a color of a display object to a darker one. Conventional examples of use in night driving will be described below.

FIG. 5 is a schematic diagram showing a first conventional example. As shown in the figure, by setting the brightness of the screen to be high during night driving, when the screen is suddenly viewed, the system displays the same brightness as during the day.

FIG. 6 is a schematic diagram showing a second conventional example. As shown in the figure, the system lowers the brightness by switching the color of the background of the display screen or the like to a lower brightness at night.

[0005]

In the above-mentioned first conventional example, the brightness of the screen is too high with respect to the darkness at night outdoors, so that when the screen is suddenly viewed, the contents of the screen are instantaneously dazzled. There is a problem that it is difficult to discriminate, and an obstacle such as hindrance to driving occurs.

Further, in the second conventional example, the hindrance of driving due to the glare of the screen is eliminated, but there is also a problem that the reduced brightness makes it difficult to distinguish information on the screen. Was.

Accordingly, an object of the present invention is to provide a car navigation system and a screen display method in which a less-needed part on a screen is displayed darker than a more-needed part in order to solve the above problem. It is in.

[0008]

In order to achieve the above object, a car navigation system according to the present invention comprises a GPS receiver for receiving a signal from a global positioning system (GPS), and a database formed by latitude and longitude. In a car navigation system including an external storage device for recording display data, a computer (microprocessor) operated by program control, and a display device for displaying display target data, a low-necessity portion on the screen is required. It is characterized in that it is darker than a high-degree part.

[0009] It is preferable that a high necessity part and a low necessity part on the screen can be designated.

Further, the GPS receiver has an observation point position acquisition section for acquiring the position of the observation point, and a date for acquiring the time.
It is preferable to include a time acquisition unit.

Further, the microprocessor calculates the latitude, longitude, and orientation of the observation point from the observation point position acquisition unit,
Display position where time information is acquired from the time acquisition unit and calculation is performed.
It is preferable to include a luminance calculation processing unit and a display effect calculation processing unit that processes the display position / luminance data obtained by the display position / luminance calculation processing unit into display object data.

[0012] It is preferable that the external storage device includes a display object obtaining section for obtaining data on the display object, and inputs the data on the display object to the display effect calculation processing section.

Further, the screen display method in the car navigation system according to the present invention is characterized in that a less necessary part on the screen is made darker than a more necessary part.

Further, it is preferable to be able to designate a high-necessity part and a low-necessity part on the screen.

Further, a step of acquiring the time and the latitude, longitude, and azimuth of the observation point from the GPS receiver, a step of reading display target data from an external storage device, and determining whether the time is daytime or nighttime from the time. Steps and
If it is determined to be nighttime, it is preferable to include a step of lowering the luminance of a portion of the display target data far from the observation point, and a step of displaying the display data after the change on the display.

In the step of lowering the luminance of a portion far from the observation point of the display target data, it is preferable that the brightly displayed portion is expanded not only in the vicinity of the user but also in the traveling direction of the vehicle.

Further, it is preferable that the step of judging whether or not the night is the same is performed under the same situation as at night, such as in a tunnel.

[0018]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a car navigation system according to the present invention. This system makes the display of the area of interest, such as the position of the own vehicle, and its surroundings moderately bright during night driving, darkens the display as you move away from it, reduces the amount of light entering the view, makes it easier to see the screen, This is to prevent the obstacles. With this system, the overall light amount can be reduced without lowering the readability of information so much by lowering the luminance of a part that is less necessary in operation as a whole.

FIG. 2 is a block diagram showing the configuration of the embodiment of the car navigation system of the present invention. In this embodiment mode, a GPS (global position) is used.
GPS system 1 for receiving a signal from a receiving system, and a CD-ROM or DVD-R recording display data stored in a database based on latitude and longitude.
An external storage device 2 such as an OM, a computer (microprocessor) 3 that operates under program control, and a display device 4 that displays display target data are provided.

The GPS receiver 1 includes an observation point position acquisition unit 11 for acquiring the position of an observation point and a date / time acquisition unit 12 for acquiring time. The microprocessor 3 is a GP
Observation point latitude / longitude / azimuth is obtained from the observation point position acquisition unit 11 provided in the S receiver 1, time information is acquired from the date / time acquisition unit 12, and the display position / luminance calculation processing unit 31 performs calculation. Are input to the display effect calculation processing unit 32 as display position / luminance data. The display object data is input to the display effect calculation processing unit 32 from the display target acquisition unit 21 provided in the external storage device 2. Display effect calculation processing unit 3
In step 2, the display object data is processed by the display luminance data, and input to the display processing unit 33 as display object data.
The display processing unit 33 displays the display data on the display device 4.

[0022]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a flowchart showing the operation of the embodiment of the screen display method of the car navigation system according to the present invention. The microprocessor 3 is a GPS receiver 1
, The time and the latitude, longitude, and orientation of the observation point are obtained from (step A1, A2). Next, the display target data is read from the external storage device 2 into the microprocessor 3 (step A).
3). Next, it is determined from the date and time obtained earlier whether it is daytime or nighttime (step A4). Next, when it is determined that it is nighttime, the display effect calculation processing unit 32 changes the luminance of a portion of the display target data far from the observation point to be lower (step A5). Then, the display data is displayed on the display 4 (step A6).

Next, another embodiment of the present invention will be described.

FIG. 4 is a schematic diagram showing an embodiment of the car navigation system of the present invention. Utilizing the concept of the above-described embodiment, the brightly displayed portion as shown in FIG. 4 can be expanded not only around the user but also in the traveling direction of the vehicle. This can be applied not only to the traveling direction but also to a bright display along the route to the destination.

Even if the vehicle is not running at night, the same display can be made under the same conditions as at night, such as in a tunnel.

[0027]

As described above, according to the present invention, it is possible to easily view the display screen of the car navigation system during night driving, so that it is possible not to hinder driving.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a display screen according to an embodiment of the present invention. This shows a system in which an interesting part and its surroundings are lightened appropriately in night driving.

FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 4 is a schematic diagram showing a display screen according to another embodiment of the present invention.

FIG. 5 is a schematic diagram showing a display screen of a first conventional example;
This shows a system that displays at the same brightness as daytime in night driving.

FIG. 6 is a schematic diagram showing a display screen of a second conventional example,
This shows a system that lowers the brightness by switching the color of the display screen background or the like to a low-luminance one at night.

[Explanation of symbols]

 Reference Signs List 1 GPS receiver 2 External storage device 3 Microprocessor 4 Display device 11 Observation point position acquisition unit 12 Year / month / time acquisition unit 21 Display target acquisition unit 31 Skin position / brightness calculation processing 32 Display effect calculation processing 33 Display processing unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 5/36 510 G09G 5/36 510B

Claims (10)

[Claims] 1. A GPS receiver for receiving a signal from a global positioning system (GPS), an external storage device for recording display data stored in a database based on latitude and longitude, and a computer (microprocessor) operated under program control ) And a display device for displaying display target data, wherein a less necessary part on the screen is darkened compared to a more necessary part. 2. The car navigation system according to claim 1, wherein a high-necessity part and a low-necessity part on the screen can be designated. 3. The GPS receiver according to claim 1, wherein the GPS receiver includes an observation point position acquisition unit that acquires a position of an observation point, and a date / time acquisition unit that acquires time. Car navigation system. 4. The microprocessor according to claim 1, wherein the microprocessor obtains an observation point latitude, longitude, and direction from the observation point position acquisition unit,
Display position where time information is acquired from the time acquisition unit and calculation is performed.
4. The image processing apparatus according to claim 3, further comprising: a luminance calculation processing unit; and a display effect calculation processing unit that processes the display position / luminance data obtained by the display position / luminance calculation processing unit into display object data. A car navigation system according to claim 1. 5. The external storage device according to claim 4, further comprising a display target acquisition unit for obtaining data on a display object, and inputting the data on the display object to the display effect calculation processing unit. Car navigation system. 6. A screen display method for displaying a screen in a car navigation system, wherein a low-necessity part on the screen is darkened as compared with a high-necessity part. Method. 7. The screen display method in a car navigation system according to claim 6, wherein a high-necessity part and a low-necessity part on the screen can be designated. 8. A step of acquiring a time and a latitude, a longitude, and an azimuth of an observation point from a GPS receiver, a step of reading display target data from an external storage device, and judging whether the time is daytime or nighttime from the time. A step of, if it is determined that the night is, changing the luminance of a portion far from the observation point of the display target data to be lower, and displaying the display data after the change on a display. Screen display method in a car navigation system. 9. The method according to claim 1, wherein in the step of lowering the luminance of a portion of the display target data far from the observation point, a portion to be displayed bright is expanded not only in the vicinity of the user but also in the traveling direction of the vehicle. 9. A screen display method in the car navigation system according to 8. 10. The screen display in the car navigation system according to claim 8, wherein the step of judging whether or not it is night is performed under the same situation as at night, such as in a tunnel. Method.