JP2001067039A - Field inversion pulse generator for interlace drive panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately produce a field inversion pulse to be fed into an interface drive panel, by applying a scanning method for an input image signal from the outside and a conversion method therefor. SOLUTION: An input image signal is converted with the use of a scan converter 3 converting a progressive signal for one screen into a signal for one field in an interlace drive panel screen, producing horizontal/vertical synchronization signals with different phases in odd and even fields, and introducing the interlace signal for one field as the progressive signal for one screen. In this case, devices 17, 5 are provided to produce a field inversion pulse on the basis of the phases of the horizontal/vertical synchronization signals in the input image signal in the case of the interlace signal input into the scan converter 3, and to produce the field inversion pulse on the basis of the phases of the horizontal/vertical synchronization signals produced by the scan converter 3 in the case of the progressive signal input thereinto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an apparatus for generating a field inversion pulse to be supplied to an interlace drive panel.

[0002]

2. Description of the Related Art A plasma display panel (PDP) employing an interlace driving technique has appeared. This interlaced drive type PDP that is currently appearing
Means that the number of lines in the vertical direction (the number of scanning lines) is, for example, 1024
When displaying a moving image by the interlaced scanning method, 512 lines of the first, third,..., 1023 lines are first scanned (odd field scanning), and then the second, The 512th line of the fourth line,..., 1024 lines is scanned (even field scanning), so that an image for one screen (one frame) is displayed.

In addition, the PD of the interlace drive system
P can also display an image (generally a still image) by the progressive scanning method (sequential scanning method), and in this case, one line of the image is displayed by scanning 512 lines of one field. You.

As shown in FIG. 8, in order to display an image on the PDP 10 of the interlace drive system, primary color signals (8-bit digital signals) R, G, B, a horizontal synchronizing signal H, a vertical synchronizing signal V, A blanking pulse BLK,
It is necessary to supply an operation clock to the PDP 10.

Further, in order to display an image on the PDP 10 in an interlaced scanning system, as shown in FIG.
It is necessary to supply a field inversion pulse to the PDP 10. This field inversion pulse is generated when the currently supplied primary color signal is an odd field signal (ie, a signal for scanning the first, third,..., 1023 lines of the screen of the PDP 10) or an even field signal (ie, 2
(A signal for scanning the 1024th line). The PDP 10 identifies the odd-field signal and the even-field signal of the supplied primary color signals using the field inversion pulse,
At the time of odd field scanning, the first line, third line,..., 1023 lines of the screen are scanned with odd field signals, and at the time of even field scanning, the second, fourth,. I do.

[0006] Among these signals supplied to the PDP 10, the field inversion pulse is not necessary for the display panel of the progressive drive system, but is required for the first time in the PDP of the interlace drive system. However, how to generate the field inversion pulse has not been sufficiently studied in the past.

[0007]

Regarding this point, there are factors such as whether the scanning method of an externally input video signal is an interlaced scanning method or a progressive scanning method, and which input video signal is scanned by a scan converter. It is considered that an accurate field inversion pulse cannot be created unless the factor of whether the conversion is made to the interlace scanning method is taken into consideration.

In view of the above, the present invention provides a field inversion pulse supplied to a display panel (referred to as an "interlace drive panel") employing an interlace drive technique such as an interlace drive type PDP.
It is an object of the present invention to provide a device that can accurately create a scanning method and a conversion method for an externally input video signal.

[0009]

In order to solve this problem, the applicant of the present invention, as described in claim 1, converts a video signal for one screen of a progressive scanning system into one screen of an interlace drive panel. Conversion means for converting the video signal into a video signal for a field; generating means for generating a horizontal synchronizing signal and a vertical synchronizing signal having different phases between an odd field and an even field;
When converting an input video signal using a scan converter having control means for taking in a video signal for a field as a video signal for one screen of a progressive scanning system into this conversion means, a field inversion supplied to an interlace drive panel When an interlaced scanning video signal is input to the scan converter in the pulse generating device, a field inversion pulse is generated based on the phases of the horizontal synchronization signal and the vertical synchronization signal in the video signal. When a progressive scan video signal is input to the scan converter, an interlaced drive panel for generating a field inversion pulse based on the phases of the horizontal synchronization signal and the vertical synchronization signal created by the creation means in the scan converter. Field inversion pulse generator Proposed.

This field inversion pulse generating apparatus converts a video signal for one screen of a progressive scanning system into a video signal for one field of a screen of an interlace drive panel, and converts a phase between an odd field and an even field. Creating means for creating a horizontal synchronizing signal and a vertical synchronizing signal different from each other, and controlling the conversion means to take an input video signal of an interlaced scanning system into a video signal of one field as a video signal of one screen of a progressive scanning system. It is proposed on the assumption that the input video signal is converted by using a scan converter having means.

The scan converter is provided with a conversion means for converting a video signal for one screen of the progressive scanning system into a video signal for one field of the screen of the interlace drive panel. Therefore, when a progressive scan video signal is input, the video signal for the first screen is converted into a video of an odd field of the screen of the interlace drive panel, and the video signal for the next screen is
The video signals of the odd-numbered and even-numbered screens of the input video signal are converted into the video signals of the even-numbered fields of the screen of the interlace driving panel by the conversion means. It is converted into an odd field and even field video signal.

The scan converter has a phase difference between the odd field and the even field in order to distinguish between the video signal of the odd field and the video signal of the even field among the video signals output from the scan converter. There is provided a creating means for creating a horizontal synchronization signal and a vertical synchronization signal.

Further, the scan converter is provided with control means for causing the input means of the interlaced scanning method to take in the video signal of one field as a video signal of one screen of the progressive scanning method. I have. Therefore, when a video signal of the interlaced scanning system is input, the video signal of the odd field and the even field of the input video signal is converted by the conversion means into the video signal of the odd field and the even field of the screen of the interlace drive panel, respectively. Is converted to

In the field inversion pulse generating apparatus according to the present invention, when an interlaced scanning video signal is input to the scan converter, the horizontal synchronizing signal generated by the generating means in the scan converter and output from the scan converter. The field inversion pulse is created based on the phases of the horizontal synchronization signal and the vertical synchronization signal in the input video signal instead of the signal and the vertical synchronization signal.

The reason is as follows. When an interlaced scanning video signal is input to this scan converter, moving image overtaking noise caused by a difference between the vertical scanning frequency of the input video signal and the vertical scanning frequency of the video signal output from the scan converter In order to prevent the occurrence of the above, it is necessary to match the vertical scanning frequency of the video signal output from the scan converter with the vertical scanning frequency of the input video signal. Therefore, in this case, it is necessary to synchronize the vertical synchronization signal V created by the creation means in the scan converter with the vertical synchronization signal in the input video signal (“V synchronization”).

However, when the V synchronization is applied, the phases of the horizontal synchronization signal and the vertical synchronization signal created by the creation means in the scan converter are affected (for example, the horizontal synchronization signal is applied to both the odd field and the even field). And the vertical synchronizing signal have the same phase), it may be impossible to distinguish between the odd field and the even field based on the phases of the horizontal synchronizing signal and the vertical synchronizing signal output from the scan converter.

Also, in this case, by applying V synchronization, the vertical scanning frequency of the video signal output from the scan converter and supplied to the interlace driving panel matches the vertical scanning frequency of the input video signal. . The video signal of the odd field and the even field of the input video signal is also converted to the video signal of the odd field and the even field of the screen of the interlace driving panel by the conversion means in the scan converter, respectively. As is well known, an HDTV (high definition television) video signal or an NTSC video signal, which is an interlaced scanning video signal input from the outside,
Since 2: 1 interlaced scanning is performed, the phases of the horizontal synchronization signal and the vertical synchronization signal are different between the odd field and the even field. Therefore, an accurate field inversion pulse can be created based on the phases of the horizontal synchronization signal and the vertical synchronization signal in the input video signal.

On the other hand, in the field inversion pulse generating apparatus, when a progressive scanning video signal is input to the scan converter, the horizontal synchronizing signal generated by the generating means in the scan converter and output from the scan converter and A field inversion pulse is created based on the phase of the vertical synchronization signal.

The reason is as follows. When a progressive scan video signal (generally, a still image signal) is input to a scan converter, V synchronization is not performed because it is not necessary to consider passing noise of a moving image. Therefore, in this case, since the vertical scanning frequency of the video signal output from the scan converter and supplied to the interlace drive panel does not match the vertical scanning frequency of the input video signal, the horizontal synchronization signal and the vertical On the basis of the phase of the synchronizing signal, it is not possible to accurately generate a field inversion pulse for identifying whether the video signal currently being supplied to the interlace drive panel is an odd field signal or an even field signal.

In this case, since V synchronization is not performed, odd and even fields are included in the horizontal synchronization signal and the vertical synchronization signal created by the creation means in the scan converter and output from the scan converter. There is a distinct phase shift. Therefore, in this case, an accurate field inversion pulse can be created based on the phases of the horizontal synchronization signal and the vertical synchronization signal created by the creation unit in the scan converter and output from the scan converter.

As described above, according to the field inversion pulse generating apparatus of the present invention, the scan converter on which the present invention is based converts either the interlaced scanning input video signal or the progressive scanning input video signal. In this case, a field inversion pulse for identifying whether the video signal currently being supplied to the interlace driving panel is a signal of an odd field or a signal of an even field can be accurately generated.

In the field inversion pulse generating apparatus according to the first aspect of the present invention, as an example, as described in the second aspect, the input to the scan converter is based on the vertical scanning frequency and the horizontal scanning frequency of the input video signal. It is preferable that the apparatus further includes a determination unit that determines a scanning method of the video signal.

This makes it possible to determine the scanning method of the input video signal to the scan converter without error and create a field inversion pulse.

Alternatively, in the field inversion pulse generating apparatus according to the first aspect, any one of a plurality of input terminals corresponding to a video signal of a specific standard may be used. It is also preferable to include a determination unit that determines the scanning method of the input video signal to the scan converter based on whether to select the video signal input from the terminal.

As a result, it is possible to determine the scanning method of the input video signal to the scan converter without error and create a field inversion pulse.

Although the progressive scanning video signal is generally a still image signal, there is also an exceptional moving image signal of the progressive scanning method, and when the moving image signal is input to the scan converter. In this case, it is necessary to apply V synchronization with a scan converter in order to prevent the occurrence of passing noise. Therefore, by inputting a moving image signal of the progressive scanning method from an input terminal different from a general video signal of the progressive scanning method, when a video signal input from the input terminal is selected, an input to the discriminating means is performed. It is also possible to determine the scanning method of the video signal as the interlaced scanning method. With this, when the progressive scanning moving image signal is input to the scan converter, the horizontal synchronizing signal and the vertical synchronizing signal in the input video signal are input in the same manner as when the interlaced scanning video signal is input to the scan converter. An accurate field inversion pulse can be created based on the phase.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which the present invention is applied to an interlace driving type PDP 10 shown in FIG. 8 will be described. FIG. 1 is a block diagram illustrating a configuration example of a signal processing system that creates a signal to be supplied to the PDP 10 based on an externally input video signal.

The composite signal V output from the VTR
an input terminal i1 for inputting video and a luminance signal Y
Having a function of separating and outputting the carrier color signal C
An input terminal i2 for inputting a luminance signal and a carrier chrominance signal Y / C output from R, an input terminal i3 for inputting primary color signals RGB output from a personal computer, and a component signal received from a broadcast station YUV
(U and V are color difference signals, respectively, I and Q in the NTSC system, and RY and BY in the other systems, respectively)
The video signal input from the input terminal i4 for inputting is input to separate input terminals of the selector 1 having four inputs and one output.

The selector 1 selects a video signal input from one of the input terminals i1 to i4 as a video signal to be input to the signal processing system. Is sent to the video processing / color reproduction circuit 2.

The video processing / color reproduction circuit 2 processes the video signal sent from the selector 1 in accordance with the type of the signal so that the primary color signals R, G, B, the horizontal synchronizing signal H, the vertical synchronizing signal H V for outputting a horizontal synchronizing signal and a vertical synchronizing signal, a comb filter for separating a luminance signal and a carrier chrominance signal from a composite signal, and a color difference signal from a carrier chrominance signal A demodulation circuit, a matrix circuit that creates a primary color signal from a luminance signal and a color difference signal, a double-speed conversion circuit that doubles the horizontal scanning frequency of an interlaced scanning video signal, an HDT
It comprises a well-known circuit such as a MUSE decoder for decoding a V-system video signal.

The primary color signals R, G, B output from the video processing / color reproduction circuit 2 are sent to the scan converter 3. Further, the horizontal synchronizing signal H and the vertical synchronizing signal V output from the video processing / color reproducing circuit 2 and an external input terminal i
One of a horizontal synchronizing signal H and a vertical synchronizing signal V input to this signal processing system via
Is sent to the scan converter 3 and the interface circuit 5.

A plurality of scan converters 3 (for example, 4
Field memories 11, 12, 13, 14
A memory controller 15 for controlling these field memories, a digital filter 16 for performing an interpolation process for converting the number of lines, and a microcomputer 17 for controlling each part of the scan converter 3 and controlling the entire signal processing system. Contains. The scan converter 3 converts the primary color signals R, G, and B sent from the video processing / color reproduction circuit 2 into a signal of the number of lines and a scanning method (8-bit digital signal) adapted to the PDP 10. It has the following three conversion modes (a) to (c).

(A) For each of the primary color signals R, G, and B of the progressive scanning method, the signals of the lines L1, L2,. Data is alternately written to lines 12, 13, and 14 one line at a time. Then, the field memory 11,
As shown in FIG. 2B, by performing weighting according to the line number conversion ratio on the signals for each of the four lines taken in 12, 13, and 14 and performing interpolation processing, as shown in FIG. L'3,... Generate odd-field signal indicating video at the position of line L'1023.

Subsequently, each line L1, L2,.
2A is alternately written to each of the field memories 11, 12, 13, and 14 by one line, as shown in FIG. 2A. Then, the field memories 11, 12, 13,
By performing weighting according to the line number conversion ratio on the signal for each of the four lines taken in 14 and performing interpolation processing,
As shown in FIG. 2C, a signal of an even field indicating an image at the position of line L'2, line L'4,... Line L'1024 on the screen of the PDP 10 is generated.

In the same manner, the signals of the lines L1, L2,...
The signal is converted into a signal indicating a video at a line position of an odd field and an even field of the screen No. 10.

(B) For each of the primary color signals R, G, and B of the interlaced scanning system, as shown in FIG. 3, the signals of the lines L1, L3,. To each field memory 11,
12 are alternately fetched one line at a time, and the signals of the lines L2, L4,... Of the even fields are alternately fetched one by one into the field memories 13 and 14. And
Interpolation processing is performed by weighting signals corresponding to four lines taken into the field memories 11, 12, 13, and 14 in accordance with the line number conversion ratio, and thereby the line positions of the odd field and the even field on the screen of the PDP 10 are obtained. Create a signal indicating the video of.

In the same manner, for each input signal of the interlaced scanning system for one frame, a signal indicating an image at the line position of the odd field and the even field of the screen of the PDP 10 is created (that is, the signal of the interlaced scanning system). , The number of lines is converted in frame units).

(C) For each of the primary color signals R, G, and B of the interlaced scanning system, as shown in FIG. 3, the signals of the lines L1, L3,. Each field memory 11,
12 are alternately fetched one line at a time, and the signals of the lines L2, L4,... Of the even fields are alternately fetched one by one into the field memories 13 and 14. And
By performing weighting according to the line number conversion ratio on the two-line signals taken into the field memories 11 and 12 and performing interpolation processing, a signal of the progressive scanning method for the first screen of the PDP 10 is created. Subsequently, a signal of the progressive scanning method for the second screen of the PDP 10 is created by performing weighting according to the line number conversion ratio on the two-line signals taken into the field memories 13 and 14 and performing interpolation processing. .

In the same manner, a progressive scanning signal for one screen of the PDP 10 is generated for each interlaced scanning input signal for one field (that is, a line-by-field signal is generated for the interlaced scanning signal). Number conversion and conversion to the progressive scanning method).

However, as will be described later, the microcomputer 17 sets the scan converter 3 in the conversion mode (a) even when the interlaced scanning primary color signals R, G, B are sent from the video processing / color reproduction circuit 2. ).

When the primary color signals R, G, and B sent from the video processing / color reproduction circuit 2 are converted by the scan converter 3, the microcomputer 17 creates a horizontal synchronizing signal H and a vertical synchronizing signal V. When conversion to the interlaced scanning method is performed, the phases of the horizontal synchronizing signal H and the vertical synchronizing signal V are changed to the primary color signals R, G,
In order to distinguish B from the primary color signals R, G, B of the even fields, the odd fields and the even fields are set to have different phases.

The primary color signals R, G, B, the horizontal synchronizing signal H, and the vertical synchronizing signal V are sent from the scan converter 3 to the interface circuit 5 together with the operation clock. The interface circuit 5 is a PLD (Programmable
Logic Device) and reverse gamma processing for canceling gamma correction on the assumption of display on a CRT for the primary color signals R, G, and B sent from the scan converter 3 and processing for inserting a character signal I do.

The primary color signals R, G, B processed by the interface circuit 5 are a horizontal synchronizing signal H, a vertical synchronizing signal V,
Along with the blanking pulse BLK and operation clock, P
It is supplied to DP10.

When the primary color signals R, G, and B of the interlaced scanning system are sent from the scan converter 3, the interface circuit 5, as shown in FIG.
The primary color signal currently being supplied to the PDP 10 is a signal of an odd field (that is, a signal for scanning the first line, third line,..., 1023 line of the screen of the PDP 10) or a signal of an even field (that is, second line, 4th line). (A signal for scanning the 1024th line), a field inversion pulse whose level is inverted is generated. 4B and 4C, the phase of the horizontal synchronizing signal H and the vertical synchronizing signal V in the primary color signal of the odd field and the horizontal synchronizing signal H in the primary color signal of the even field and the vertical synchronizing signal H are generated. This is performed based on the difference from the phase of the synchronization signal V. This field inversion pulse is also supplied from the interface circuit 5 to the PDP 10.

Next, the operation of the signal processing system controlled by the microcomputer 17 in the scan converter 3 will be described. When a video signal among the video signals input to the input terminals i1 to i4 in FIG. 1 to be input to the signal processing system is designated by operating an operation switch (not shown) or the like, the microcomputer 17
Supplies a selector 1 with a control signal for selecting the specified video signal.

As a result, the designated video signal is selected by the selector 1 and sent to the video processing / color reproduction circuit 2, so that the primary color signals R, G,
B is sent from the video processing / color reproduction circuit 2 to the scan converter 3.

The microcomputer 17 is used for image processing and
The horizontal scanning frequency and the vertical scanning frequency of the primary color signals R, G, and B sent from the color reproduction circuit 2 are measured, and the scanning method of the input video signal to the signal processing system is determined based on the measurement results.

That is, the horizontal scanning frequency and vertical scanning frequency are 15.75 kHz, 60 Hz, and 15.625 kHz.
z, 50Hz, NTSC output from VTR
Since it is a video signal of the PAL system or the PAL system (the signal Video input to the input terminal i1 or the signal Y / C input to the input terminal i2), it is determined that the signal is an interlace scanning type signal.

The horizontal scanning frequency and vertical scanning frequency are 31.5 kHz, 60 Hz, 37.9 kHz, 60 Hz.
, 48.4kHz, 60Hz, 64kHz, 60Hz, VGA output from personal computer
Since it is a video signal of the SVGA, XGA, or SXGA system (the signal RGB input to the input terminal i3), it is determined that the signal is of the progressive scanning system.

The horizontal scanning frequency and vertical scanning frequency are 33.8 kHz, 60 Hz, 33.8 kHz, 50 Hz.
If the number of lines in the Japanese system is 1125 HDTV signals received from the broadcasting station or the number of lines in the European system is 12
Since there are 50 HDTV signals (the signal YUV input to the input terminal i4), it is determined that the signal is an interlaced scanning signal.

The horizontal scanning frequency and vertical scanning frequency are 15.734 kHz, 59.94 Hz and 15.
If the frequency is 625 kHz or 50 Hz, an NTSC or PAL video signal (input terminal i4
Since the signal YUV is input to the signal Y, the signal is determined to be an interlaced scanning signal.

The horizontal scanning frequency and the vertical scanning frequency are the reciprocals of the horizontal scanning period and the vertical scanning period, respectively. The horizontal scanning period and the vertical scanning period plus the retrace period are the horizontal scanning line period and the vertical scanning period, respectively. The horizontal scanning line period and the vertical scanning line period are equal to the repetition period of the horizontal synchronizing signal H and the vertical synchronizing signal V, respectively. Therefore, in the microcomputer 17, for example, the horizontal synchronization signal H and the vertical synchronization signal V separated from the input video signal by the video processing / color reproduction circuit 2 are selected by the selector 4, and the horizontal synchronization signal H sent from the selector 4 is selected. , And the vertical scanning frequency can be measured based on counting the vertical synchronization signal V for a certain period of time.

The microcomputer 17 performs image processing and
When it is determined that the primary color signals R, G, B sent from the color reproduction circuit 2 are signals of the progressive scanning system, the scan converter 3 is operated in the above-mentioned conversion mode (a).
In this case, the processing performed on the signal of the progressive scanning method is as shown in FIG.

In this case, the microcomputer 17 controls the interface circuit 5 to control the field inversion pulse based on the phases of the horizontal synchronization signal H and the vertical synchronization signal V sent from the scan converter 3 to the interface circuit 5. (See FIG. 4).

On the other hand, even when it is determined that the primary color signals R, G, B sent from the video processing / color reproduction circuit 2 are signals of the interlaced scanning system, the microcomputer 17
Operates the scan converter 3 also in the conversion mode (a).

FIG. 5 is a diagram showing a process performed in the conversion mode (a) on the interlaced scanning primary color signals R, G, and B. For each of the primary color signals R, G, and B, first, as shown in FIG. 5A, the lines L1 and L of the odd field in the signal for the first frame.
The signals of 3,...
3 and 14 are alternately taken in one line at a time. Then, by weighting the signals for each of the four lines taken into the field memories 11, 12, 13, and 14, and performing interpolation processing, the lines L′ 1, L′ 3,. A signal indicating an image at the position of the line L'1023 is created.

Subsequently, as shown in FIG. 5B, each of the lines L2 and L2 of the even field in the signal of the first one frame.
The signals of L4,...
3 and 14 are alternately taken in one line at a time. Then, by weighting the signals for each of the four lines taken into the field memories 11, 12, 13, and 14, and performing interpolation processing, the lines L'2, L'4,. A signal indicating an image at the position of the line L'1024 is created.

In the same manner, a signal indicating an image at the line position of the odd field and the even field of the screen of the PDP 10 is generated for each signal of the odd field and the even field (that is, the input image of the interlaced scanning method). For signal, PDP1 in field units
Line number conversion is performed according to 0).

Here, when the signal of the interlaced scanning system sent from the video processing / color reproduction circuit 2 is an HDTV signal (1125 or 1250 lines) or an NTSC signal (1050 lines) passed through a double speed conversion circuit. , The number of lines of this signal is 102
Since the number is close to four, the line number conversion ratio in the scan converter 3 is close to one. FIG. 6 shows the screen of the PDP 10 when the number of lines of the interlaced scanning signal sent from the video processing / color reproduction circuit 2 is approximately 1024 (that is, the line number conversion ratio is regarded as 1). It indicates at which line position a signal indicating an image is created.

As shown in FIG. 6A, from the signal of the line L1 of the odd field (that is, the weight of the signals of the lines other than the line L1 is set to zero), the position of the line L'1 of the odd field on the screen of the PDP 10 is changed. Is generated. Similarly, from the signals of the lines L3, L5,... L1023 of the odd fields, the lines L′ 3, L′ 5,.
A signal indicating an image at the position 1023 is created.

As shown in FIG. 6B, from the signal of the line L2 in the even field (that is, the weight of the signals of the lines other than the line L2 is set to zero), the PDP 10
, A signal indicating an image at the position of the line L′ 2 in the even field of the screen is generated. Similarly, the signals of the lines L4, L6,.
Lines L'4, L'6, of even fields of screen 10
.. A signal indicating an image at the position of L'1024 is created.

When the interlaced primary color signals R, G, B converted by the processing of FIG. 5 are supplied to the PDP 10 via the interface circuit 5, as shown in FIG. 7, the primary color signals R, G, B at PDP10
Line L'1, line L'3,... Line L'1 on the screen
023 are scanned, and the primary color signals R, G,
B, line L'2, line L'4 on the screen of PDP 10
... line L'1024 is scanned. The primary color signals R, G, and B in the odd-numbered fields indicate the video at the positions of the line L′ 1, the line L′ 3,.
The primary color signals R, G, and B of the even field are line L'2,
Since the image at the position of line L'4,... Line L'1024 is shown, the image displayed on line L'1, line L'3, ... line L'1023 and line L'2, line L ' 4,... The image displayed on line L'1024 is not the same.

If the primary color signals R, G, B sent from the video processing / color reproduction circuit 2 are determined to be interlaced scanning signals, the microcomputer 17
The selector 4 selects the horizontal synchronizing signal H and the vertical synchronizing signal V output from the video processing / color reproduction circuit 2 (that is, the horizontal synchronizing signal H and the vertical synchronizing signal V in the input video signal). The synchronization signal H and the vertical synchronization signal V are sent to the scan converter 3 and the interface circuit 5. Then, the vertical synchronization signal V generated by the microcomputer 17 is synchronized with the vertical synchronization signal V in the input video signal (“V synchronization”). Therefore, in this case, the vertical scanning frequency of the primary color signals R, G, B output from the scan converter 3 matches the vertical scanning frequency of the input video signal.

In this case, the microcomputer 17 controls the interface circuit 5 so that the selector 4 does not output the horizontal synchronizing signal H and the vertical synchronizing signal V sent from the scan converter 3 to the interface circuit 5, 5, a field inversion pulse is created based on the phases of the horizontal synchronization signal H and the vertical synchronization signal V (that is, the horizontal synchronization signal H and the vertical synchronization signal V in the input video signal) (see FIG. 4).

This is because the microcomputer 17 creates the horizontal synchronizing signal H and the vertical synchronizing signal V having different phases in the odd field and the even field during the conversion to the interlaced scanning method as described above. The phase is affected (for example, the phases of the horizontal synchronizing signal H and the vertical synchronizing signal V are aligned in both fields), so that the phases of the horizontal synchronizing signal H and the vertical synchronizing signal V sent from the scan converter 3 are changed. This may cause a situation in which the odd field and the even field cannot be distinguished from each other based on.

In this case, by applying V synchronization, the primary color signals R, G, B supplied from the scan converter 3 to the PDP 10 via the interface circuit 5 are obtained.
Is the same as the vertical scanning frequency of the input video signal. As shown in FIGS. 5 and 6, the odd-field and even-field signals output from the video processing / color reproduction circuit 2 are converted into the odd-field and even-field signals of the screen of the PDP 10 by the scan converter 3, respectively. Is converted. Even in the case of an HDTV video signal or an NTSC video signal, which is an interlaced scanning video signal input from the outside, 2: 1 interlaced scanning is performed, as is well known, so that an odd field and an even field are horizontal. The phases of the synchronization signal and the vertical synchronization signal are different. Therefore, in this case,
An accurate field inversion pulse can be created based on the phases of the horizontal synchronization signal H and the vertical synchronization signal V in the input video signal.

Conversely, when the primary color signals R, G, B sent from the video processing / color reproduction circuit 2 are signals of the progressive scanning system, it is not necessary to consider passing noise of a moving image. Do not apply V synchronization. Accordingly, in this case, the primary color signals R, G, and R supplied from the scan converter 3 to the PDP 10 via the interface circuit 5 are output.
B does not match the vertical scanning frequency of the input video signal, the current PDP 10 based on the phases of the horizontal synchronizing signal H and the vertical synchronizing signal V in the input video signal.
It is not possible to accurately generate a field inversion pulse for identifying whether the primary color signals R, G, and B being supplied to the odd field signal or the even field signal are supplied to the pixel.

In this case, since V synchronization is not performed, the scan converter 3 sends the interface circuit 5
In the horizontal synchronization signal H and the vertical synchronization signal V sent to the first and second sections, there is a phase shift that can distinguish the odd field from the even field. Therefore, in this case, the horizontal synchronizing signal H sent from the scan converter 3 as described above is used.
And an accurate field inversion pulse can be created based on the phase of the vertical synchronization signal V.

As described above, in this signal processing system, when a video signal of the interlaced scanning system is input, the video signal of the odd field and the even field of the input video signal is converted by the scan converter 3.
The video signals are converted into video signals of odd and even fields of the screen of the PDP 10, respectively.

As described above, since the conversion is performed in units of fields on the input video signal of the interlaced scanning system, even if a fast moving image is displayed on the PDP 10, the image is not blurred.

The input video signals of the odd and even fields are converted into the video signals of the odd and even fields of the screen of the PDP 10, respectively.
The video signal obtained by converting the input video signal of the odd field and the video signal obtained by converting the input video signal of the even field do not become a signal indicating the video at the same position on the screen.
As a result, the image displayed on line L'1, line L'3,... Line L'1023 on the screen of PDP 10 and the image displayed on line L'2, line L'4,. They cannot be the same. Therefore, P
An image displayed on the DP 10 does not become an image having a reduced vertical resolution due to the same image being displayed on two adjacent lines.

Furthermore, the video signal of each field of the interlaced scanning system is treated as a progressive scanning video signal, so that the progressive scanning video signal among the conversion modes of the scan converter 3 is converted to the interlaced video signal. Since the input video signal of the interlaced scanning method is converted using the conversion mode (conversion mode (a)) as it is, there is no need to newly develop a conversion means for the input video signal of the interlaced scanning method.

When an interlaced video signal is input, the vertical scanning frequency of the video signal output from the scan converter 3 is made to match the vertical scanning frequency of the input video signal, so that the video signal is displayed on the PDP 10. Also, overtaking noise of a moving image caused by a difference between the vertical scanning frequency of the input video signal and the vertical scanning frequency of the video signal output from the scan converter 3 is prevented from being generated in the moving image.

Further, by determining the scanning method of the input video signal based on the horizontal scanning frequency and vertical scanning frequency of the input video signal, whether the input video signal is a progressive scanning video signal or an interlaced scanning video signal is determined. The microcomputer 1 performs control according to whether the signal
7 can be performed without error.

Also, regardless of whether a video signal of either the interlaced scanning method or the progressive scanning method is input, an accurate field inversion pulse can be generated by the interface circuit 5. Thus, the odd-field signal and the even-field signal of the video signal supplied to the PDP 10 can be identified by the PDP 10 without error.

In the above example, the scanning method of the input video signal is determined based on the horizontal scanning frequency and the vertical scanning frequency of the primary color signals R, G, B sent from the video processing / color reproduction circuit 2. . However, as another example, each input terminal i
Since each of the input terminals i1 to i4 corresponds to a video signal of a specific standard, the input video is input based on which of the input terminals i1 to i4 is selected by the selector 1. The scanning method of the signal may be determined.

Although the video signal of the progressive scanning system is generally a still image signal, it is a 525 progressive TV signal (because the number of effective lines is about 480, 4
80P), a moving image signal of the progressive scanning system is also exceptionally present.
When determining the scanning method of the input video signal based on the selection in the above, by inputting the moving image signal of the progressive scanning method from an input terminal different from the video signal of the general progressive scanning method, from the input terminal When the input video signal is selected by the selector 1, the scanning method of the input video signal may be distinguished from the interlaced scanning method. This allows the microcomputer 17 to perform the same control as when an interlaced scanning video signal is input when a progressive scanning video signal is input.

In the above example, in addition to the conversion mode (conversion mode (a)) for converting a progressive scanning video signal into an interlaced video signal, the number of lines per frame of the interlaced scanning signal is increased. The scan converter 3 having a conversion mode (conversion mode (b)) for performing conversion and a conversion mode (conversion mode (c)) for performing line number conversion and conversion to the progressive scanning method on a field-by-field basis for an interlaced scanning signal.
Is provided. However, since the video signal of each field of the interlaced scanning method is treated as the video signal of the progressive scanning method and processed in the conversion mode (a), a scan converter having only the conversion mode (a) may be provided. Of course.

In the above example, the input video signal of the interlaced scanning system is converted by using the conversion mode (a) of the scan converter 3 as it is, but a scan converter having such a conversion mode (a) is provided. Instead, a new scan converter is developed to convert the odd-field and even-field video signals of the interlaced scanning-type input video signals into the odd-field and even-field video signals of the screen of the interlace drive panel, respectively. Is also good.

In the above example, the present invention is applied to an interlaced drive type PDP having 1024 lines. However, the present invention may be applied to an interlaced drive type PDP having other than 1024 lines. Of course.

In the above example, the present invention is applied to an interlaced driving type PDP. However, if a liquid crystal panel or an organic EL panel employing an interlaced driving technique is realized in the future, the interlaced driving method will be used. The present invention may be applied to a driving panel.

The interlaced drive panel to which the present invention is applied may be either a panel used as a direct-view display or a panel used in a projection display.

Further, the present invention is not limited to the above-described example, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0084]

As described above, according to the field inversion pulse generating apparatus for an interlace drive panel according to the first aspect of the present invention, an input video signal of an interlaced scanning system is generated by a scan converter based on the present invention. Regardless of which of the progressive scan input video signals is converted, a field inversion pulse for identifying whether the video signal currently being supplied to the interlaced drive panel is an odd field signal or an even field signal,
The effect of being able to create accurately is obtained.

According to the field inversion pulse generating apparatus for an interlaced driving panel according to the second aspect, there is also obtained an effect that a field inversion pulse can be generated by judging a scanning method of an input video signal to a scan converter without error. Can be

According to the field inversion pulse generating apparatus for an interlace drive panel according to the third aspect, the field inversion pulse can be generated by judging the scanning method of the input video signal to the scan converter without error. When a progressive scanning type moving image signal is input to a scan converter, a video signal based on an interlaced scanning type is input to a scan converter, and is based on the phases of the horizontal synchronization signal and the vertical synchronization signal in the input video signal. And an accurate field inversion pulse can be created.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a signal processing system that generates a signal to be supplied to an interlace driving type PDP.

FIG. 2 is a diagram illustrating processing in one conversion mode of the scan converter of FIG. 1;

FIG. 3 is a diagram illustrating processing in another conversion mode of the scan converter of FIG. 1;

FIG. 4 is a diagram showing a field inversion pulse created by the interface circuit of FIG. 1 and phases of a horizontal synchronization signal and a vertical synchronization signal in an interlace scanning video signal.

FIG. 5 is a diagram showing processing in a conversion mode of FIG. 2 for an interlaced scanning video signal.

6 is a diagram showing processing in the conversion mode of FIG. 2 for the interlaced scanning video signal of FIG. 5;

FIG. 7 is a diagram showing how a screen of a PDP is scanned by a signal converted in the process of FIG. 5;

FIG. 8 is a diagram illustrating signals that need to be supplied to an interlaced drive type PDP.

[Explanation of symbols]

1, 4 selector, 2 video processing / color reproduction circuit, 3
Scan converter, 5 interface circuits,
10 Plasma display panel (PDP), 1
1, 12, 13, 14 field memory, 15 memory controller, 16 digital filter, 17
Microcomputer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/66 101 G09G 3/28 H

Claims (3)

[Claims] 1. A conversion means for converting a video signal for one screen of a progressive scanning system into a video signal for one field of a screen of an interlace drive panel, a horizontal synchronizing signal having a different phase between an odd field and an even field, and A scan converter comprising: a generating unit for generating a vertical synchronizing signal; and a control unit for causing an input video signal of an interlaced scanning system to be taken in by the conversion unit as a video signal of one screen of a progressive scanning system. When converting an input video signal by using a device for generating a field inversion pulse to be supplied to an interlace driving panel, when a video signal of an interlaced scanning method is input to the scan converter, Field based on the phase of the horizontal and vertical sync signals Creating an inversion pulse, and, when a progressive scanning video signal is input to the scan converter, creating a field inversion pulse based on the phases of the horizontal synchronization signal and the vertical synchronization signal created by the creation unit. A field inversion pulse generating apparatus for an interlace drive panel, characterized in that: 2. The apparatus according to claim 1, wherein a scanning method of the input video signal is determined based on a vertical scanning frequency and a horizontal scanning frequency of the input video signal to the scan converter. A field inversion pulse generating apparatus for an interlaced drive panel, further comprising a determination unit for determining whether the field inversion pulse is generated. 3. A video signal input from one of a plurality of input terminals corresponding to a video signal of a specific standard in the field inversion pulse generating apparatus for an interlace drive panel according to claim 1. A field inversion pulse generating apparatus for an interlace drive panel, further comprising: a determination unit configured to determine a scanning method of an input video signal to the scan converter based on whether to select.