JP4934388B2 - Navigation system - Google Patents

Description

  The present invention relates to an OSD (On Screen Display) technique for displaying a predetermined image superimposed on a video.

  In Patent Document 1, an input video signal and an image signal such as a character are switched for each pixel in synchronization with the video signal so that an image such as a character is superimposed on the video and displayed. On-screen display technology is disclosed.

JP 2000-224477 A

  By the way, in some navigation systems that are mounted on a vehicle and have a navigation device and a display device, the navigation device and the display device are connected by a cable or the like and arranged at different locations. In such a system configuration, when on-screen display is performed on the display device, the configuration of the navigation system is, for example, as shown in FIG.

  A conventional navigation system 70 includes a navigation device 71 and a display device 77. The navigation device 71 includes a drawing unit 72, an SP (serial-parallel) conversion unit 73, an OSD control unit 74, a switching unit 75, and a PS (parallel-serial) conversion unit 76.

  The drawing unit 72 generates an image such as a navigation screen or a television video as RGB 6-bit video data and outputs it as serial data. The SP conversion unit 73 converts the serial data output from the drawing unit 72 into RGB 6-bit parallel data. In addition, the SP conversion unit 73 extracts a synchronization signal included in the video data output from the drawing unit 72 and supplies it to the OSD control unit 74 and the PS conversion unit 76.

  The OSD control unit 74 holds an OSD image to be superimposed on the video generated by the drawing unit 72 as RGB 6-bit data for each pixel, and is synchronized with the synchronization signal supplied from the SP conversion unit 73. The pixel value of the pixel to be displayed is supplied to the switching unit 75. In addition, the OSD control unit 74 generates a switching signal that is active in the pixels in the screen on which the OSD image is to be displayed, and outputs the switching signal to the switching unit 75 in synchronization with the synchronization signal supplied from the SP conversion unit 73.

  The switching unit 75 has a total of 18 switching circuits of 6 bits for each of RGB, and each of the 6 bits of RGB generated by the drawing unit 72 when the switching signal input from the OSD control unit 74 is inactive. Are output to the PS converter 76 as 18-bit parallel data. In addition, when the switching signal is active, the switching unit 75 outputs the RGB 6-bit OSD image data generated by the OSD control unit 74 to the PS conversion unit 76 as 18-bit parallel data.

  The PS conversion unit 76 converts the 18-bit parallel data output from the switching unit 75 into serial data in synchronization with a synchronization signal included in the video data, and outputs the serial data to the display device 77.

  The display device 77 includes an SP (serial-parallel) conversion unit 78 and a display unit 79. The SP converter 78 converts the serial data output from the navigation device 71 into 18-bit parallel data, and outputs it as 6-bit RGB data. Further, the SP conversion unit 78 extracts a synchronization signal from the serial data output from the navigation device 71 and supplies it to the display unit 79. The display unit 79 displays the RGB data output from the SP conversion unit 78 for each pixel in synchronization with the synchronization signal supplied from the SP conversion unit 78.

  By the way, recent navigation systems are becoming more and more multifunctional, and the number of components incorporated in the apparatus is also increasing. However, the space in the dashboard in which the navigation device is arranged is standardized, and the size of the navigation device cannot be increased simply because the number of parts increases. Therefore, it is required to reduce the number of parts of the navigation device as much as possible.

  On the other hand, the display device 77 tends to have a large screen so that more information can be displayed as the navigation system becomes multifunctional, and the size restriction of the display device 77 is not as severe as the navigation device 71. . Therefore, for example, in FIG. 4, if the switching unit 75, which is a relatively large component having 18 switching circuits, can be attached to the display device 77, there is room for arranging other components inside the navigation device 71. Can do.

  However, the switching unit 75 is simply disposed in the display device 77, and the 18-bit parallel data output from the SP conversion unit 73 and the 18-bit parallel data output from the OSD control unit 74 are separately displayed on the display device. If the data is output to 77, the PS conversion unit 76 is required for each, and the space for arranging other parts in the navigation device 71 may not be so wide.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the number of parts in the navigation device and to reduce the space occupied by the parts in the navigation device.

  In order to solve the above problems, the navigation system of the present invention sends a video, an OSD image, and a signal for switching between the video and the display image from the navigation device to the display device, and the video and the OSD image are displayed on the display device side. And switching for each pixel. Further, when transmitting the video and the OSD image, the navigation apparatus allocates 8 bits to each of RGB, and allocates 6 bits to the video and 2 bits to the OSD image for each of RGB.

  Further, the present invention is a navigation system that is mounted on a vehicle and includes a navigation device and a display device, for example. The navigation device generates a video to be displayed on the display device, and a video generated by the drawing unit. An OSD image signal indicating an OSD (on-screen display) image to be superimposed on the image is generated, and switching for switching the video and the OSD image for each pixel in synchronization with a synchronization signal included in the video signal indicating the video An OSD control device that generates a signal, and the OSD control device converts a pixel value of a pixel in a screen on which an OSD image is to be displayed into an RGB 2-bit OSD in synchronization with a synchronization signal included in the video signal. In addition to outputting as an image signal, the pixel in the screen on which the OSD image is to be displayed is displayed. An OSD control unit that outputs a switching signal that becomes active in the display to a display device, and a PS conversion unit that converts 3 bytes of parallel data into serial data. A PS conversion unit that converts 3 bytes of parallel data in which 6 bits are assigned to the signal and 2 bits are assigned to the OSD image signal to serial data and is output to the display device. The display device receives the serial data transmitted from the navigation device. Data is converted into 3-byte parallel data, and for each of RGB, 6 bits are output as the pixel value of the video signal, and 2 bits are output as the pixel value of the OSD image signal, respectively, and output from the navigation device OS output from the SP converter when the selected switching signal is active When the pixel value of the image signal is output and the OSD switching signal is inactive, the switching unit that outputs the pixel value of the video signal output from the SP conversion unit and the synchronization signal included in the video signal are synchronized. Thus, a navigation system is provided that includes a display unit that displays a pixel having a pixel value output from a switching unit at a position in a screen to be displayed.

  According to the navigation system of the present invention, the number of parts in the navigation device can be reduced, and the space occupied by the parts in the navigation device can be reduced.

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

  FIG. 1 is a system configuration diagram showing a configuration of a navigation system 10 according to an embodiment of the present invention. The navigation system 10 is mounted on a moving body such as a vehicle, and includes a navigation device 20 and a display device 30. The navigation device 20 and the display device 30 are connected by a cable or the like and can transmit and receive data to and from each other. In the present embodiment, the navigation system 10 includes one display device 30, but as another form, the navigation system 10 may include a plurality of display devices 30.

  The navigation device 20 includes a drawing unit 21, an SP conversion unit 22, an OSD control unit 23, and a PS conversion unit 24. The drawing unit 21 generates video data such as a screen or television video used for navigation in the RGB format, and outputs the generated video data as serial data. The video data generated by the drawing unit 21 has a 6-bit pixel value for each pixel of RGB (data indicating red, data indicating green, and data indicating blue).

  The SP conversion unit 22 converts the serial data output from the drawing unit 21 into 18-bit parallel data for every 6 bits of RGB. In addition, the SP conversion unit 22 extracts a synchronization signal included in the video data output from the drawing unit 21 and supplies it to the OSD control unit 23 and the PS conversion unit 24.

  The OSD control unit 23 holds OSD image data to be superimposed on the video generated by the drawing unit 21, and in synchronization with the synchronization signal supplied from the SP conversion unit 22, the OSD image data of the pixel to be displayed in the OSD image is displayed. The pixel value is output in 2 bits for each of RGB. In addition, the OSD control unit 23 generates a switching signal that becomes active in the pixels in the screen on which the OSD image is to be displayed, and outputs the switching signal to the display device 30 in synchronization with the synchronization signal supplied from the SP conversion unit 22.

  Here, the OSD image is usually often used to display setting information for setting the brightness, hue, and the like of the display device 30. Therefore, the object can be achieved even if the color of the OSD image is a color that can be distinguished from the background image. In this embodiment, 2 bits for each of RGB can be used as the pixel value of the OSD image data, and 64 colors can be used for the OSD image.

  The PS conversion unit 24 receives parallel data of 6-bit RGB video data converted by the SP conversion unit 22 and receives parallel data of 2-bit RGB OSD image data output from the OSD control unit 23. Then, as shown in FIG. 2A, the PS conversion unit 24 assigns 8 bits to each of RGB, assigns video data to upper 6 bits, and assigns OSD image data to lower 2 bits for each of RGB. .

  Then, the PS conversion unit 24 converts RGB 8-bit parallel data generated from the video data and the OSD image data into serial data as shown in FIG.

  In this way, the PS conversion unit 24 converts parallel data of 8 bits for each of RGB, a total of 24 bits, into serial data. Many commercially available parallel-serial conversion circuits handle data in units of multiples of 8 bits. Therefore, the navigation device 20 can use a commercially available parallel-serial conversion circuit as the PS conversion unit 24, and can reduce the cost.

  Further, since the PS converter 24 handles data of a multiple of 8 bits, all the ports of a commercially available parallel-serial conversion circuit can be used, and the parallel-serial conversion circuit can be used efficiently. Therefore, it is not necessary to use a parallel-serial conversion circuit having an extra port, so that the space occupied by the parts of the PS conversion unit 24 in the navigation device 20 can be further reduced.

  Note that the allocation of RGB data is not limited to the above example, and for each 8 bits of RGB, if RGB data of a video is allocated to any 6 bits and RGB data of an OSD image is allocated to the remaining 2 bits. Good.

  The display device 30 includes an SP conversion unit 31, a switching unit 32, and a display unit 33. The SP conversion unit 31 converts the serial data output from the navigation device 20 into 24-bit parallel data, and outputs the upper 6 bits as RGB data of the video in 8 bits of RGB, and the lower 2 bits of the OSD image. Output as RGB data. In addition, the SP conversion unit 31 extracts a synchronization signal included in the video signal from the serial data output from the navigation device 20 and supplies it to the display unit 33.

  The switching unit 32 outputs the RGB data of the OSD image to the display unit 33 when the switching signal output from the OSD control unit 23 is active. At this time, for example, as shown in FIG. 3, the switching unit 32 assigns the RGB data of the OSD image output from the SP conversion unit 31 to the upper 2 bits for 6 bits of RGB, and 0 or 1 for all the lower 4 bits. Assign.

  On the other hand, when the switching signal is inactive, the switching unit 32 outputs the RGB data of the video to the display unit 33.

  The display unit 33 displays the RGB data output from the switching unit 32 in synchronization with the synchronization signal supplied from the SP conversion unit 31 for each pixel.

  The embodiment of the present invention has been described above.

  As is clear from the above description, according to the navigation system 10 of the present invention, the number of parts in the navigation device 20 can be reduced and the space occupied by the parts in the navigation device 20 can be reduced.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above-described embodiment, each 2-bit RGB data is assigned to the OSD image, but as another form, in any one lower 1 bit of each 2-bit RGB data assigned to the OSD image, A switching signal generated by the OSD control unit 23 may be assigned.

  Thus, although the types of colors that can be used for the OSD image are reduced, a dedicated signal line for transmitting the switching signal output from the OSD control unit 23 to the display device 30 can be eliminated. Therefore, the interface circuit for outputting the switching signal can be eliminated, and the number of parts in the navigation device 20 can be further reduced.

  The OSD control unit 23 transmits the RGB data of the OSD image composed of one color to the display device 30 in advance, and the display device 30 holds the RGB data of the OSD image received from the OSD control unit 23. Then, the OSD control unit 23 outputs the switching signal as 1-bit data to the PS conversion unit 24, and the PS conversion unit 24 outputs the 6 bits of RGB of the video data and the switching signal output from the OSD control unit 23. The 19-bit data composed of 1 bit is converted into a serial signal and output to the display device 30.

  The SP conversion unit 31 decomposes 19-bit serial data into RGB 6-bit video data and a 1-bit switching signal and supplies them to the switching unit 32. The switching unit 32 outputs the retained RGB data of the OSD image to the display unit 33 when the switching signal is active, and the RGB data of the video to the display unit 33 when the switching signal is inactive. Output.

  As described above, by transmitting the RGB data of the OSD image to the display device 30 in advance, the PS conversion unit 24 can eliminate the signal line dedicated to the switching signal, and the OSD image is composed of one color. If there is, an OSD image of any color (for example, any one of about 260,000 colors) can be displayed by transmitting RGB data in advance.

1 is a system configuration diagram illustrating a configuration of a navigation system 10 according to an embodiment of the present invention. 5 is a conceptual diagram for explaining parallel-serial conversion processing executed by a PS conversion unit 24. FIG. 5 is a conceptual diagram for explaining pixel value conversion processing of an OSD image executed by a switching unit 32. FIG. It is a system configuration | structure figure which shows an example of a structure of the conventional navigation system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Navigation system, 20 ... Navigation apparatus, 21 ... Drawing unit, 22 ... SP conversion part, 23 ... OSD control part, 24 ... PS conversion part, 30 ... Display Device, 31 ... SP conversion unit, 32 ... switching unit, 33 ... display unit, 40 ... R data, 41 ... G data, 42 ... B data, 43 ... serial Data, 50 ... R data, 51 ... G data, 52 ... B data, 70 ... Navigation system, 71 ... Navigation device, 72 ... Drawing unit, 73 ... SP conversion 74, OSD control unit, 75 ... switching unit, 76 ... PS conversion unit, 77 ... display device, 78 ... SP conversion unit, 79 ... display unit

Claims (2)

A navigation system mounted on a vehicle and including a navigation device and a display device,
The navigation device
A drawing unit for generating video to be displayed on the display device;
An OSD image signal indicating an OSD (on-screen display) image to be superimposed on the video generated by the drawing unit is generated, and the video and the OSD image are synchronized with a synchronization signal included in the video signal indicating the video. An OSD control device that generates a switching signal for switching each pixel.
The OSD control device
In synchronization with the synchronization signal included in the video signal, the pixel value of the pixel in the screen on which the OSD image is to be displayed is output as an OSD image signal of 2 bits for each RGB, and the OSD image is to be displayed. An OSD control unit that outputs a switching signal that becomes active at a timing when a pixel in the screen is displayed to the display device;
A PS (Parallel-Serial) converter that converts 3 bytes of parallel data into serial data, each of which assigns 1 byte to RGB, and for each of RGB, 6 bits for the video signal and 2 bits for the OSD image signal A PS conversion unit that converts the parallel data of 3 bytes allocated to the serial data and outputs the serial data to the display device,
The display device
The serial data transmitted from the navigation device is converted into 3-byte parallel data, and for each of RGB, 6 bits are output as the pixel value of the video signal, and 2 bits are output as the pixel value of the OSD image signal. An SP (serial-parallel) conversion unit,
When the switching signal output from the navigation device is active, the pixel value of the OSD image signal output from the navigation device is output,
A switching unit that outputs a pixel value of the video signal output from the SP conversion unit when the OSD switching signal is inactive;
A navigation system comprising: a display unit configured to display pixels having a pixel value output from the switching unit at a position in a screen to be displayed in synchronization with a synchronization signal included in the video signal. The navigation system according to claim 1,
The PS converter is
For each of RGB, the parallel data of 3 bytes in which the upper 6 bits are assigned to the video signal and the lower 2 bits are assigned to the OSD image signal is converted into serial data,
The SP converter is
A navigation system characterized in that, for each of RGB, the upper 6 bits are output as the pixel value of the video signal, and the lower 2 bits are output as the pixel value of the OSD image signal.

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