JP2011095139A - On-vehicle navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle navigation system which facilitates smooth driving of vehicles by particularly enhancing the visibility of images necessary for navigation for high environmental illumination. <P>SOLUTION: The on-vehicle navigation system having an illuminance sensor and a display part includes a control part which controls the display part to make it display a navigation screen, highlighting the image necessary for navigation, in place of a normal ordinary navigation screen, when the level of a detection signal detected by the illuminance sensor exceeds a prescribed threshold. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an in-vehicle navigation device.

  Conventionally, an in-vehicle navigation device has a function of detecting the own vehicle position and a function of searching for a route to a destination, and displays a navigation screen including the own vehicle position and the searched route. However, there is a problem that the visibility of the navigation screen is deteriorated when the ambient illuminance is high due to direct sunlight.

  Therefore, for example, in Patent Document 1, the input video signal is converted into a color space composed of hue, saturation, and brightness signal, and a brightness control coefficient is calculated based on the converted saturation and the illuminance detected by the illuminance detection means. An in-vehicle display is disclosed in which the converted brightness is corrected by a calculated brightness control coefficient and an image is displayed on the display. Thereby, the color is adjusted so that the color contrast is enlarged, and a display with improved visibility can be obtained even when the environmental illumination is high.

  In addition, for example, in Patent Document 2, when the illuminance detected by the illuminance detection unit is equal to or greater than a threshold value, a process for emphasizing the outline of a character or a process in which a character and background are in a complementary color relationship is performed. Has been disclosed. Thereby, even when environmental illumination is high, the visibility of a character display can be improved.

JP 2007-248936 A JP 11-352950 A

  However, neither Patent Document 1 nor Patent Document 2 described above has particularly improved the visibility of an image necessary for navigation such as the vehicle position and the search route when the ambient illuminance is high.

  In view of the above problems, the present invention provides an in-vehicle navigation device capable of facilitating driving of a vehicle by particularly enhancing the visibility of an image necessary for navigation when the ambient illuminance is high. Objective.

In order to achieve the above object, an in-vehicle navigation device of the present invention includes an illuminance sensor and a display unit.
When the level of the detection signal detected by the illuminance sensor exceeds a predetermined threshold value, the control unit is configured to control to display on the display unit a navigation screen that highlights an image necessary for navigation.

  According to such a configuration, when the ambient illuminance is high due to direct sunlight or the like, the image necessary for navigation is highlighted, so that the visibility of the image necessary for navigation is particularly increased, and the vehicle is driven. It can be smoothed.

  In the above configuration, the vehicle has a function of detecting the vehicle position and a function of performing a route search, and the image necessary for the navigation is an image showing the vehicle position and an image showing the searched route. Good.

  Furthermore, when a navigation screen highlighting an image necessary for the navigation is displayed on the display unit, the image indicating the vehicle position and the image indicating the search route may be displayed in monochrome.

  In any one of the configurations described above, when a navigation screen highlighting an image necessary for navigation is displayed on the display unit, the background image displayed on the normal navigation screen may be deleted.

  In any one of the configurations described above, when a navigation screen highlighting an image necessary for the navigation is displayed on the display unit, an image indicating a road other than the searched route may be displayed.

  According to the vehicle-mounted navigation device of the present invention, when the ambient illuminance is high, driving of the vehicle can be facilitated by particularly improving the visibility of an image necessary for navigation.

It is a block diagram which shows the main structures of the navigation apparatus which concerns on this invention. It is a flowchart regarding the navigation screen display control which concerns on this invention. It is a figure which shows an example of the navigation screen of a normal display. It is a figure which shows the navigation screen corresponding to FIG. 3 when illumination intensity is high.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a main configuration of a navigation apparatus according to the present invention. The navigation device 10 is for mounting on a vehicle, specifies the current location of the vehicle (own vehicle position) based on radio waves received from a GPS (Global Positioning System) satellite, and shows a map of the vicinity of the vehicle along with the vehicle position. The main function is to display the navigation screen and guide the vehicle to the destination along the guide route.

  The navigation device 10 includes a GPS unit 11, a gyro sensor 12, a vehicle speed sensor 13, an illuminance sensor 14, an interface unit 15, a control unit 16, a recording medium 17, a drive unit 18, a drawing unit 19, A display control unit 20, a display unit 21, a sound source circuit unit 22, a speaker 23, an interface unit 24, a hard key 25, a touch panel 26, and a position detection unit 27 are provided.

  The GPS unit 11 includes a receiving antenna, a tuner, and the like, processes radio waves received from GPS satellites, and extracts positioning data. The retrieved positioning data is sent to the control unit 16 via the interface unit 15. The control unit 16 specifies the vehicle position based on the positioning data sent from the GPS unit 11.

  The navigation device 10 employs a so-called hybrid system, and also uses a gyro sensor 12 for detecting the direction of the vehicle and a vehicle speed sensor 13 for detecting the speed of the vehicle. Detection signals from the gyro sensor 12 and the vehicle speed sensor 13 are sent to the control unit 16 via the interface unit 15, and the control unit 16 specifies the direction and speed of the vehicle based on those signals.

  The navigation device 10 also includes an illuminance sensor 14. The illuminance sensor 14 sends a detection signal of a level corresponding to the illuminance to the control unit 16 via the interface unit 15, and the control unit 16 sends the detected detection. Based on the signal, navigation screen display control as described later is performed.

  The control unit 16 performs overall control of the navigation device 10 and executes various processes such as vehicle position specification and route search. The control unit 16 is composed of, for example, a microcomputer, and is read from a CPU 16a that executes various programs in which control procedures are described, data used by the CPU 16a, and a recording medium 17 described later, and is executed by the CPU 16a. A RAM 16b for temporarily storing programs, and a ROM 16c for storing programs, font data, and the like describing basic controls relating to startup, input / output, and the like. The CPU 16a, RAM 16b, ROM 16c and the like are connected via a bus (not shown).

  As the recording medium 17, a hard disk, a memory card, an optical disk or the like can be adopted. The recording medium 17 stores a map database necessary for display of a navigation screen, route search, and the like, and a program describing various operations of the navigation device 10. Then, the control unit 16 reads this program from the recording medium 17 via the drive unit 18 and executes it.

  The map database is used to generate map data, drawing parameters that are referenced when drawing navigation screens based on map data, index data that is referenced in various searches, and voice for route guidance and other purposes. Audio data is included. The map data includes road data and background data including water system data, facility data, and the like regarding coastlines and rivers. And the control part 16 takes out data required for operation | movement to perform partially from a map database, and refers it.

  The drawing unit 19 is an IC chip that includes a drawing-dedicated CPU and the like, and creates navigation screen image data, operation screen image data, and the like based on instructions from the control unit 16. The image data created by the drawing unit 19 is sent to the display control unit 20 and stored in a RAM included in the display control unit 20. The display control unit 20 sends an image display signal to the display unit 21 based on the stored image data, and causes the display area of the display unit 21 to display a screen related to the image data. As the display unit 21, an LCD, an organic EL display, or the like is used.

  The sound source circuit unit 22 generates an analog audio signal for route guidance and other uses based on the audio data sent from the control unit 16. The generated analog audio signal is reproduced by the speaker 23.

  The hard key 25 includes a power key for turning on / off the power, a volume adjusting key, and the like. When one of the keys constituting the hard key 25 is pressed, a signal notifying that the key is pressed is sent to the control unit 16 via the interface unit 24.

  The touch panel 26 is, for example, a pressure-sensitive panel having transparent electrodes arranged in a lattice shape, and is disposed on the display area of the display unit 21. When the touch panel 26 is pressed, the position detection unit 27 generates a signal for notifying the coordinate information of the pressed position based on the voltage signal sent from the touch panel 26. This signal is sent to the control unit 16 via the interface unit 24.

  Next, display control of the navigation screen using the illuminance sensor 14 in the navigation device 10 having such a configuration will be described with reference to the flowchart of FIG. Here, it is assumed that the route search is performed in advance by the control unit 16, and the flowchart of FIG. 2 is periodically started.

  When the flowchart of FIG. 2 is started, in step S1, the control unit 16 determines whether or not the level of the detection signal detected by the illuminance sensor 14 exceeds a predetermined threshold value.

  If the level of the detection signal does not exceed the threshold value (N in step S1), the process proceeds to step S2, and the control unit 16 instructs the drawing unit 19 according to the drawing parameters recorded in the recording medium 17, and performs normal A navigation screen is displayed on the display unit 21. In the normal navigation screen, the vehicle position image, the searched route image included in the area around the own vehicle position, the background image included in the area around the own vehicle position, and the road other than the searched route included in the area around the own vehicle position. The image is displayed in color.

  FIG. 3 shows an example of a normal display navigation screen. The own vehicle position image 30 includes a triangular image 30a indicating the direction of the own vehicle, a ring-shaped image 30b surrounding the vehicle, and a destination direction display image 30c indicating the direction of the destination and displayed on the ring-shaped image 30b And consist of The background image 31 includes a building image 31a indicating a building and a marine image 31b indicating the ocean. The searched route image 32 is displayed in a color different from the road image 33 indicating a road other than the searched route.

  Returning to the flowchart of FIG. 2, if the level of the detection signal exceeds the threshold value in step S1 (Y in step S1), the process proceeds to step S3, and the control unit 16 instructs the drawing unit 19, Instead of the normal navigation screen, a navigation screen highlighting the vehicle position and the searched route is displayed on the display unit 21. In this navigation screen, the vehicle position image and the searched route image are displayed in monochrome, and the background image that is normally displayed is deleted, but the road other than the searched route is displayed.

  FIG. 4 shows a navigation screen in the case of step S3 corresponding to FIG. The own vehicle position image 30 ′ is an image in which a black triangle is arranged inside a white circle bordered with black, and the triangle indicates the direction of the own vehicle. In the vehicle position image 30 ′, an image corresponding to the normally displayed destination direction display image 30 c (FIG. 3) is not displayed. The search route image 32 'is displayed in black. Further, the background image 31 (FIG. 3) that is normally displayed is deleted, and the road image 33 'that indicates a road other than the searched route is displayed.

  As described above, when the level of the detection signal of the illuminance sensor 14 exceeds the threshold value, the vehicle position image and the search route image are displayed in monochrome, and the background image that is normally displayed is deleted, so that the vehicle position and Since the searched route is highlighted, the driver can instantly recognize the vehicle position and the searched route even when the ambient illuminance is high due to direct sunlight, and the driving of the vehicle can be facilitated. At this time, by displaying roads other than the searched route, the driver can grasp the positional relationship between the vehicle position and the searched route and the road other than the searched route, and the driving can be smoother.

  The above embodiment can be implemented with various modifications.

  For example, in step S3 in FIG. 2, the background image that is normally displayed may be deleted, and roads other than the searched route may not be displayed.

  Further, for example, in step S3 of FIG. 2, a screen in which the vehicle position image and the search route image are displayed in monochrome on the normal display navigation screen may be displayed.

  Further, for example, in step S3 of FIG. 2, a screen in which only the background image is deleted from the normal display navigation screen, or a screen in which the road image other than the background image and the searched route is deleted from the normal display navigation screen. You may make it display.

DESCRIPTION OF SYMBOLS 10 Navigation apparatus 11 GPS part 12 Gyro sensor 13 Vehicle speed sensor 14 Illuminance sensor 15 Interface part 16 Control part 16a CPU
16b RAM
16c ROM
DESCRIPTION OF SYMBOLS 17 Recording medium 18 Drive part 19 Drawing part 20 Display control part 21 Display part 22 Sound source circuit part 23 Speaker 24 Interface part 25 Hard key 26 Touch panel 27 Position detection part 30 Own vehicle position image 30a Triangle image 30b Ring-shaped image 30c Destination direction Display image 31 Background image 31a Building image 31b Marine image 32 Search route image 33 Road image 30 'Own vehicle position image 32' Search route image 33 'Road image

Claims (5)

In an in-vehicle navigation device having an illuminance sensor and a display unit,
A control unit is provided for controlling the display unit to display a navigation screen in which an image necessary for navigation is highlighted when a level of a detection signal detected by the illuminance sensor exceeds a predetermined threshold value. In-vehicle navigation device. It has a function to detect its own vehicle position and a route search function,
The in-vehicle navigation device according to claim 1, wherein the images necessary for navigation are an image indicating a vehicle position and an image indicating a search route.   3. The display device according to claim 2, wherein when the navigation screen highlighting an image necessary for the navigation is displayed on the display unit, the image indicating the vehicle position and the image indicating the search route are displayed in monochrome. In-vehicle navigation device.   The in-vehicle system according to claim 2 or 3, wherein a background image displayed on a normal navigation screen is deleted when a navigation screen highlighting an image necessary for the navigation is displayed on the display unit. Navigation device.   5. The image showing a road other than the searched route is displayed when a navigation screen highlighting an image necessary for the navigation is displayed on the display unit. 6. In-vehicle navigation device.

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