JP2005142928A - Video signal processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a matching work between a video image output monitor and video signal output equipment is very complicated. <P>SOLUTION: A navigation device main body 2 which outputs a video signal including an RGB signal and a synchronizing signal for establishing display synchronization for performing screen display of the RGB signal on a display screen of a display 4, has a synchronizing signal generation part 12 which generates a plurality of kinds of synchronizing signals with different output timings and a synchronizing signal selector part 13 which selects a predetermined synchronizing signal among the plurality of kinds of synchronizing signals according to a selector signal and transmits the video signal including the predetermined synchronizing signal and the RGB signal to the display 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a color component signal such as an analog RGB signal and a synchronization signal for establishing display synchronization for displaying the color component signal on a display screen of a display device such as a color monitor, a color television or an LCD. The present invention relates to a video signal processing apparatus that transmits a video signal including the above to a display, and outputs a clear video to the display based on a synchronization signal.

  Conventionally, a system including such a video signal processing device includes a video signal processing device that generates a video signal including an RGB signal and a synchronization signal, and a color that outputs a video signal generated by the video signal processing device. This display unit receives a synchronization signal included in the video signal from the video signal processing device, and establishes display synchronization by matching the sampling timing of the synchronization signal and the RGB signal. The output pixels of the video signal processing device and the display pixels of the display unit are combined in units of one pixel, and as a result, a clear image based on the RGB signals can be output on the display unit (see, for example, Patent Document 1). .

  However, according to the system including the conventional video signal processing device, the video signal processing device and the display are connected with a cable, and when the video signal is transmitted from the video signal processing device to the display through the cable, the same is performed. Due to transmission loss of the cable, a transmission time difference may occur between the RGB signal and the synchronization signal included in these video signals.

  If a transmission time difference occurs between the RGB signal and the sync signal in this way, a shift occurs between the RGB signal and the sync signal, so that the output pixel of the video signal processing device and the display pixel of the display do not match, and the display of the display Problems such as “smear” and “flicker” occur in the video.

  Similarly, according to such a system, the hardware characteristics of the video signal processing device and the display do not match, for example, the output characteristics of the video signal processing device and the display characteristics of the display do not match In this case, the output pixel of the video signal processing device and the display pixel of the display unit do not match, and the display video of the display unit has problems such as “smear” and “flickering”.

Therefore, in order to solve such a problem, for example, by adjusting the internal circuit of the display, the deviation between the RGB signal and the synchronization signal is corrected, or the display characteristic of the display is displayed in the output characteristics of the video signal processing device. By matching the characteristics, the output pixel of the video signal processing device and the display pixel of the display can be matched, and as a result, problems such as “bleeding” and “flickering” in the display video of the display can be avoided. It has been known.
Japanese Patent Laid-Open No. 9-312783 (see abstract and FIG. 1)

  However, according to the conventional video signal processing device described above, in order to avoid problems such as “bleeding” and “flickering” that occur in the display video of the display, the output of the video signal processing device (video signal output device) In order to match the pixels with the display pixels of the display device (video output monitor), it is necessary to adjust the internal circuit of the display device. However, this adjustment operation is very difficult and requires a complicated operation by an expert.

  In addition, when a system including such a video signal processing device is applied to, for example, an in-vehicle navigation system, a video signal such as map information is output to a display from a navigation device body that is a video signal processing device. However, as described above, when a problem such as “smear” or “flicker” occurs in the display image of the display device, the characters on the map are difficult to see, and the visibility is deteriorated.

  The present invention has been made in view of the above points, and an object of the present invention is to output a clear video display on a display screen without requiring complicated work by a skilled worker, and to visually check the display. An object of the present invention is to provide a video signal processing apparatus having excellent performance.

  To achieve the above object, the video signal processing apparatus of the present invention outputs a video signal including a color component signal and a synchronization signal for establishing display synchronization for displaying the color component signal on a display screen. A video signal processing device capable of generating a plurality of types of synchronization signals having different output timings, selecting a predetermined synchronization signal from the plurality of types of synchronization signals, and the predetermined synchronization signal and the color component signal Video signal processing means for outputting a video signal including

  In the video signal processing apparatus of the present invention, the video signal processing means includes a synchronization signal generating means for generating a plurality of types of synchronization signals having different output timings, and a synchronization signal generating means according to the selection signal. A synchronization signal selection means for selecting a predetermined synchronization signal among the plurality of types of synchronization signals generated, and a video signal including the predetermined synchronization signal selected by the synchronization signal selection means and the color component signal Output it.

  According to the video signal processing device of the present invention configured as described above, a plurality of types of synchronization signals having different output timings can be generated, and a predetermined synchronization signal is selected from the plurality of types of synchronization signals. Since a video signal including a predetermined synchronization signal and the color component signal is output, not only a single synchronization signal as in the prior art but also a plurality of types of synchronization signals having different output timings are provided. By making it possible to select a predetermined synchronization signal close to the synchronization signal synchronized with the color component signal among the types of synchronization signals, the synchronization between the color component signal and the synchronization signal is synchronized, that is, a video signal processing device (video signal Output unit) and display unit (video output monitor) can be adjusted in pixel units, eliminating the need for conventional circuit adjustment work inside the display unit as much as possible, requiring complicated adjustment work by experts. Further, it is possible to provide the user with a clear display image with excellent visibility.

  According to the video signal processing device of the present invention, a plurality of types of synchronization signals having different output timings can be generated, and a predetermined synchronization signal is selected from the plurality of types of synchronization signals according to a selection signal, and this selection is performed. Since the video signal including the predetermined synchronization signal and the color component signal is output, the synchronization signal is close to the synchronization signal synchronized with the color component signal, for example, according to the selection signal by the selection operation among the plurality of types of synchronization signals. By making it possible to select a predetermined synchronization signal, it is possible to synchronize the color component signal and the synchronization signal with a simple operation, that is, to enable alignment in units of pixels between the video signal processing device and the display. By eliminating the circuit adjustment work inside the display as much as possible, it is possible to provide a user with a clear display image with excellent visibility without requiring complicated adjustment work by a skilled worker.

  Hereinafter, an in-vehicle navigation system showing an embodiment relating to a video signal processing device of the present invention will be described based on the drawings. FIG. 1 is a block diagram showing a schematic configuration inside an in-vehicle navigation system showing the present embodiment.

  An in-vehicle navigation system 1 shown in FIG. 1 includes a navigation device main body 2 that generates a video signal such as route guidance information, and a display 4 that is connected to the navigation device main body 2 through a cable 3. Receives the RGB signal and the synchronization signal included in the video signal from the navigation apparatus body 2, and outputs the RGB signal based on the synchronization signal.

  Further, the navigation device body 2 includes a video processor 11 that generates a video signal including an RGB signal and a synchronization signal, and a plurality of types, for example, four types, of different output timings based on the synchronization signal from the video processor 11. A synchronization signal generation unit 12 that generates a synchronization signal, and a synchronization signal selector unit 13 that selects a predetermined synchronization signal according to a selector signal, which will be described later, among a plurality of types of synchronization signals generated by the synchronization signal generation unit 12; The synchronization signal output interface 14 for cable transmission of the synchronization signal selected by the synchronization signal selector 13 to the display 4 and the RGB signal output interface 15 for cable transmission of the RGB signal from the video processor 11 to the display 4 A touch sensor 16 that monitors a touch operation on the touch panel on the display screen of the display 4; And a microcomputer 17 for controlling the entire navigation apparatus main body 2.

  FIG. 2 is an explanatory diagram showing a timing chart relating to various signals inside the navigation apparatus body 2.

  The synchronization signal generator 12 shown in FIG. 2 adjusts the output timing of the synchronization signal to be transmitted to the display 4 and accurately matches the timing on the display 4 side sampling the RGB signal in units of one pixel. A plurality of types, for example, four types of synchronization signals are generated.

  The synchronization signal generation unit 12 generates a drawing clock for the video processor 11 by dividing the reference clock from the reference clock generation unit 22 that generates the reference clock and the reference clock from the reference clock generation unit 22 by 1/2. A clock generation unit 21, a NOT circuit 23 that inverts and outputs the reference clock from the reference clock generation unit 22, and four types of synchronization signals (synchronization signal A, synchronization signal B, synchronization signal C, and the like based on the synchronization signal and the reference clock) It has first, second and third D flip-flop circuits 24 (24a, 24b, 24c) for generating a synchronizing signal D).

  The synchronization signal generation unit 12 generates four types of synchronization signals by shifting the output timing of the synchronization signal every 1/4 cycle of the drawing clock (1/2 cycle of the reference clock). The signal A, the synchronization signal B, the synchronization signal C, and the synchronization signal D are input to the synchronization signal selector unit 13, respectively.

  The video processor 11 transmits the synchronization signal A to the A input of the synchronization signal selector unit 13 at a normal timing.

  The first D flip-flop circuit 24 a uses the NOT circuit 23 to detect the falling edge of the reference clock from the reference clock generation unit 22, and uses the synchronization signal from the video processor 11 as the synchronization signal B. 24b and the B signal of the sync signal selector 13 are transmitted. As shown in FIG. 2, the synchronization signal B is output at a timing delayed by ¼ cycle of the drawing clock with respect to the synchronization signal A.

  The second D flip-flop circuit 24b detects the rising edge of the reference clock from the reference clock generator 22, and uses the synchronization signal from the first D flip-flop circuit 24a as the synchronization signal C, and the third D flip-flop circuit 24c and the synchronization signal. The data is transmitted to the C input of the selector unit 13. As shown in FIG. 2, the synchronization signal C is output at a timing delayed by 1/4 cycle of the drawing clock with respect to the synchronization signal B, that is, at timing delayed by 2/4 cycle of the drawing clock with respect to the synchronization signal A. Will be.

  The third D flip-flop circuit 24c detects the falling edge of the reference clock from the reference clock generation unit 22 through the NOT circuit 23, and uses the synchronization signal from the second D flip-flop circuit 24b as the synchronization signal D. This is transmitted to the D input of the unit 13. As shown in FIG. 2, the synchronization signal D is a timing delayed by a quarter cycle of the drawing clock with respect to the synchronization signal C, that is, a timing delayed by a quarter cycle of the drawing clock with respect to the synchronization signal A, that is, a synchronization. The signal A is output at a timing delayed by 3/4 period of the drawing clock with respect to the signal A.

  That is, the synchronization signal generation unit 12 generates the synchronization signal A, the synchronization signal B, the synchronization signal C, and the synchronization signal D at the output timing delayed by ¼ period of the drawing clock. These synchronization signals are transmitted to the synchronization signal selector 13 respectively.

  When the microcomputer 17 detects various touch operations of the display device 4 through the touch sensor 16, the microcomputer 17 executes various control operations based on the detection results. For example, when the microcomputer 17 detects a synchronization signal selection operation, the microcomputer 17 responds to the selection operation. The selected selector signal is transmitted to the synchronization signal selector unit 13.

  The synchronization signal selector unit 13 receives the synchronization signal A, the synchronization signal B, the synchronization signal C, and the synchronization signal D, selects a synchronization signal corresponding to the selector signal from the microcomputer 17 and selects this synchronization signal. The synchronized signal is output to the synchronization signal output interface 14.

  The video signal processing device according to the claims is the navigation device main body 2, the video signal processing means is the synchronization signal generation unit 12, the synchronization signal selector unit 13 and the microcomputer 17, and the synchronization signal generation means is the synchronization signal generation unit 12, the synchronization signal. The selection means corresponds to the synchronization signal selector unit 13 and the microcomputer 17.

  Next, operation | movement of the vehicle-mounted navigation system 1 which shows this Embodiment is demonstrated.

  The video processor 11 outputs a video signal to display the route guidance information on the display 4, supplies the RGB signal of the video signal to the RGB signal output interface 15, and sends the synchronization signal of the video signal to the synchronization signal selector. The A input of the unit 13 is supplied to the first D flip-flop circuit 24a and the drawing clock generation unit 21, respectively.

  The drawing clock generation unit 21 in the synchronization signal generation unit 12 generates a drawing clock by dividing the reference clock generated by the reference clock generation unit 22 by ½, and supplies this drawing clock to the video processor 11. To do.

  The reference clock generation unit 22 supplies the reference clock to each of the first, second, and third D flip-flop circuits 24a, 24b, and 24c.

  In the first D flip-flop circuit 24 a, when the synchronization signal A is used as a reference, the synchronization signal B delayed by ¼ period of the drawing clock is supplied to the B input of the synchronization signal selector unit 13.

  In the second D flip-flop circuit 24 b, when the synchronization signal A is used as a reference, the synchronization signal C delayed by 2/4 period of the drawing clock is supplied to the C input of the synchronization signal selector unit 13.

  In the third D flip-flop circuit 24 c, when the synchronization signal A is used as a reference, the synchronization signal D delayed by 3/4 period of the drawing clock is supplied to the D input of the synchronization signal selector unit 13.

  The synchronization signal selector unit 13 switches between four types of synchronization signals: synchronization signal A, synchronization signal B, synchronization signal C, and synchronization signal D.

  When the touch sensor 16 detects a selection operation corresponding to a desired synchronization signal from the synchronization signal selection buttons 4a (A, B, C, D) being displayed on the display screen of the display device 4 shown in FIG. Is sent to the microcomputer 17.

  When the microcomputer 17 detects a selection operation through the touch sensor 16, the microcomputer 17 supplies a selector signal for selecting a synchronization signal corresponding to the selection operation to the synchronization signal selector unit 13.

  When detecting the selector signal from the microcomputer 17, the synchronization signal selector unit 13 selects a synchronization signal corresponding to the selector signal from the plurality of synchronization signals, and supplies the selected synchronization signal to the synchronization signal output interface 14.

  The display unit 4 performs an operation of matching sampling timings of the synchronization signal selected by the synchronization signal selector unit 13 and the RGB signal. When the sampling timing is met, display synchronization between the RGB signal and the synchronization signal is established, and the output pixel of the video processor 11 and the display pixel of the display unit 4 are matched in units of one pixel. If the timing does not match, the display synchronization between the RGB signal and the synchronization signal is not established, and the output pixel of the video processor 11 and the display pixel of the display unit 4 do not match. As a result, the display screen of the display unit 4 is displayed. Smudge will occur.

  Therefore, when the user determines that a clear video display cannot be obtained on the display 4, the user performs a selection operation of the synchronization signal selection button 4 a displayed on the display 4 in order to select another synchronization signal.

  When the microcomputer 17 detects the selection operation through the touch sensor 16, the microcomputer 17 supplies a selector signal corresponding to the selection operation to the synchronization signal selector unit 13.

  When detecting the selector signal from the microcomputer 17, the synchronization signal selector unit 13 selectively outputs a synchronization signal corresponding to the selector signal to the display 4. In this way, the user side can easily select four types of synchronization signals having different output timings and easily select a synchronization signal that provides an optimal image display while viewing the display image on the display 4. .

  In the display 4, when the sampling timing of the sync signal selected by the sync signal selector unit 13 and the RGB signal match, display synchronization between the RGB signal and the sync signal is established, and the output pixel of the video processor 11 and the display are displayed. Therefore, the display pixel of the device matches in units of one pixel, and a clear video display is obtained.

  According to the present embodiment, not only a single synchronization signal as in the prior art, but also a plurality of types of synchronization signals with different output timings, and the plurality of types of synchronization signals are selected according to the selection operation of the synchronization signal selection button 4a. By making it possible to select a predetermined synchronization signal close to the synchronization signal synchronized with the RGB signal among the synchronization signals, the display synchronization between the RGB signal and the synchronization signal is matched, that is, the pixel between the video processor 11 and the display 4. By aligning in units, eliminating the conventional circuit adjustment work inside the display 4, it eliminates the need for complicated adjustment work by a skilled person, and provides a clear display with excellent visibility. Video can be provided to the user.

  In the above embodiment, the navigation apparatus main body 2 has been described as an example of the video signal processing apparatus. However, for example, an incoming television broadcast is received, and an RGB signal and a synchronization signal related to this television broadcast are displayed on the display 4. It goes without saying that the same effect can be obtained even with a TV tuner or the like that transmits to the TV.

  In the above embodiment, the first, second, and third D flip-flop circuits 24a, 24b, and 24c and the NOT circuit 23 constitute the synchronization signal generating unit 12, and four types of synchronization signals having different output timings. However, the present invention is not limited to the configuration using the D flip-flop circuit, and may be configured using other delay elements.

  In the above embodiment, the drawing clock generator 21 generates the drawing clock by dividing the reference clock by 1/2. However, by increasing the drawing clock of the video processor 11, Needless to say, the output timing of the synchronization signal may be changed.

  The video signal processing apparatus of the present invention has not only a single synchronization signal as in the prior art but also a plurality of types of synchronization signals with different output timings, and among these types of synchronization signals, the video signal processing device is synchronized with the color component signal. By making it possible to select a predetermined synchronization signal close to the synchronized signal, it is possible to perform synchronization between the color component signal and the synchronization signal, that is, alignment in units of pixels between the video signal processing device and the display. By eliminating the circuit adjustment work inside the display as much as possible, it is possible to provide a clear display video to the user without requiring complicated adjustment work by a skilled person, for example, This is useful for an in-vehicle video system equipped with a display such as a color monitor or LCD, such as an in-vehicle navigation system.

It is a block diagram which shows schematic structure inside the vehicle-mounted navigation system which shows embodiment in connection with the video signal processing apparatus of this invention. It is explanatory drawing which shows the timing chart of the various signals inside the navigation apparatus main body in connection with this Embodiment. It is explanatory drawing which shows an example of the synchronizing signal selection screen of the display in connection with this Embodiment.

Explanation of symbols

2 Navigation device body (video signal processing device)
4 Display 12 Sync signal generator (synchronization signal generator, video signal processor)
13 Synchronization signal selector (synchronization signal selection means, video signal processing means)
17 Microcomputer (synchronization signal selection means, video signal processing means)

Claims (2)

A video signal processing device that outputs a video signal including a color component signal and a synchronization signal for establishing display synchronization for displaying the color component signal on a display screen,
Video capable of generating a plurality of types of synchronization signals having different output timings, selecting a predetermined synchronization signal from the plurality of types of synchronization signals, and outputting a video signal including the predetermined synchronization signal and the color component signal A video signal processing apparatus comprising: a signal processing unit; The video signal processing means includes
Synchronization signal generating means for generating a plurality of types of synchronization signals having different output timings;
In accordance with a selection signal, it has a synchronization signal selection means for selecting a predetermined synchronization signal among a plurality of types of synchronization signals generated by the synchronization signal generation means,
2. The video signal processing apparatus according to claim 1, wherein a video signal including a predetermined synchronization signal selected by the synchronization signal selection means and the color component signal is output.

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