JP2001067042A - Scan converter for interlace driving panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scan converter which does not allow an image to become unfocused or poor vertical resolution when the scan converter is used for a display panel which adopted an interlace driving technique. SOLUTION: A scan converter is equipped with a conversion means 3 which converts an image signal per screen of a progressive scanning system into the image signal per field of screen on an interlace driving panel, a control means 17 which determines a scanning system of an input image signal based on a vertical scanning frequency and a horizontal scanning frequency, and when the image signal of an interlace scanning system is inputted, which fetches the image signal per field into the conversion means 3 as the image signal per screen of the progressive scanning system and makes the vertical scanning frequency of the image signal outputted from the conversion means 3 coincident with the vertical scanning frequency of the input image signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scan converter for converting a scanning method of a video signal, and more particularly to a scan converter suitable for use in 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] Of these signals supplied to the PDP 10, the primary color signals R, G, and B are input video signals from the outside (for example, a television signal or VT received from a broadcast station).
It must be created by converting the number of lines and the scanning method of the R reproduction signal) by a scan converter.

However, interlaced drive type PDPs
Conventionally, it has not been sufficiently studied what kind of scan converter is desirable to use.

[0008]

In this regard, for example, a scan converter that has been widely used, such as the following (1) or (2), is replaced with an interlaced drive type PD.
Use for P is also conceivable.

(1) A method of converting the number of lines of a video signal of an interlaced scanning system in units of frames (that is, a video signal of an odd field and a video signal of an even field). (2) A line signal conversion and a conversion to a progressive scanning method are performed on an interlaced scanning video signal in field units (that is, an odd field video signal and an even field video signal are separately separated).

However, using such a scan converter has the following disadvantages. First, in the scan converter of (1), since the conversion is performed in frame units, when a fast-moving image is displayed on the interlace driving panel, the image moves due to the movement of the image between the odd field scanning and the even field scanning. It blurs.

If a circuit for detecting a motion vector and correcting a motion is provided, it is possible to eliminate the blur of the image. However, such a motion detection / correction circuit is relatively expensive, and in particular, an image having a large number of lines, such as an HDTV (high definition television) video signal or an NTSC video signal obtained by converting the horizontal scanning frequency to double speed. In the case of inputting a signal, the capacity of the memory in this circuit must be increased, so that it becomes considerably expensive. Therefore, for example, when an interlaced drive type PDP is used as a display of a personal computer, it is difficult in terms of cost to provide a motion detection / correction circuit.

On the other hand, in the scan converter of (2), since the conversion is performed in units of fields, even if a fast moving image is displayed, the image is not blurred. However, in this scan converter, since the conversion into the progressive scanning video signal is performed, as shown in FIG. 9, the video has a reduced vertical resolution.

That is, in this scan converter,
Regarding the video signal of the odd field, as shown in FIG. 9A,
By performing interpolation processing by weighting the video signal of the first line L1 and the video signal of the third line L3 in accordance with the line number conversion ratio, the position of the line L′ 1 on the screen of the PDP 10 is obtained. Create a signal indicating the video of.
(The figure shows an example in which the line number conversion ratio is 1. In this case, the weight of the video signal at the position of the lower line L3 becomes zero. Each lower line other than the line L3 in FIG. 9A) The same is true for.)

Similarly, lines L3 and L5 and line L5
And L7,..., Weighting the video signal of every two adjacent lines and performing interpolation processing,
A signal indicating an image at the position of line L′ 3, line L′ 5,... On the screen of PDP 10 is created. In this way,
The video signal of the odd field is converted into the video signal of the first screen of the progressive scanning system.

On the other hand, as for the video signal of the even-numbered field, as shown in FIG. 9B, the video signal of each line L2, L4,.
Line L'1, line L'3, line L 'of ten screens
A signal indicating an image at the positions of 5,... Is created. That is, since the video signal of the odd field and the video signal of the even field are respectively converted into the video signal for one screen of the progressive scanning system, the video signal created from the video signal of the even field is created from the video signal of the odd field. This shows an image at the same line position as the image signal. In this way, the video signal of the even field is converted to the video signal of the second screen of the progressive scanning system.

When the video signal converted by this scan converter is supplied to the PDP 10, as shown in FIG.
Line L'1, line L'3,... Line L'1023 of the screen of DP10 are scanned, and the video signal of the second screen obtained by converting the video signal of the even field is line L'2, line L 'of the screen of PDP10. 4,... Line L'1024 is scanned.

However, since the video signal of the first screen and the video signal of the second screen indicate a video at the same line L'1, line L'3,... Line L'1023, the line L ' 2, lines L'4,..., The image displayed on line L'1024 are line L'1, line L'3,.
This is the same as the video displayed on line L'1023. Therefore, since the same image is displayed on two adjacent lines, the image has a vertical resolution reduced to half.

As described above, any of the scan converters (1) and (2) causes blurring of an image and a decrease in vertical resolution, and is not suitable for use as a scan converter for an interlaced drive type PDP. Met.

Further, for example, the video signal of the interlace scanning system supplied from the outside is cut off or thinned out in the upper and lower lines, or the PDP 1 is cut off.
It is also conceivable to supply 0. However, in that case, the degree of freedom of image display is reduced, for example, the size of the image displayed on the PDP 10 cannot be freely changed.

In view of the above, in the present invention, an image is blurred when used for a display panel employing an interlace driving technique such as an interlace driving type PDP (referred to as an "interlace driving panel"). SUMMARY OF THE INVENTION It is an object of the present invention to provide a scan converter that does not produce an image with reduced vertical resolution.

[0021]

In order to solve this problem, the applicant of the present invention has proposed an odd-numbered field of an interlaced scanning type input video signal.
A scan converter for an interlace drive panel is provided, which includes a conversion unit for converting a video signal of an even field into a video signal of an odd field and an even field of a screen of the interlace drive panel.

In this scan converter, an odd field of an input video signal of an interlaced scanning system,
The video signals of the even fields are converted by the conversion means into the odd fields,
It is converted into a video signal of an even field.

As described above, since the conversion is performed in units of fields with respect to the input video signal of the interlace scanning system, the conversion is performed in units of frames with respect to the video signal of the interlace scanning system as in the above-described (1) scan converter. Unlike the case of performing the above, even if a fast moving image is displayed on the interlace driving panel, the image is not blurred.

Then, the input video signals of the odd field and the even field are converted into the video signal of the odd field and the even field of the screen of the interlace driving panel, respectively. Unlike the case where the input video signals of the even fields are respectively converted into video signals for one screen of the progressive scanning system, the video signals obtained by converting the input video signals of the odd fields and the video signals obtained by converting the input video signals of the even fields are compared with each other. Does not become a signal indicating an image at the same position on the screen. Therefore, an image displayed on the interlace driving panel does not become an image having a reduced vertical resolution.

In the scan converter according to the first aspect, as an example, as described in the second aspect,
It is preferable that the image processing apparatus further includes control means for matching the vertical scanning frequency of the video signal output from the conversion means with the vertical scanning frequency of the input video signal.

As a result, in the image displayed on the interlaced drive panel, passing noise of a moving image occurs due to a difference between the vertical scanning frequency of the input video signal and the vertical scanning frequency of the video signal output from the conversion means. Is also prevented.

Next, the applicant of the present invention has 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 interlaced driving panel. A scan converter for an interlaced driving panel, comprising: a control unit for taking in an interlaced scanning type input video signal as a video signal for one screen of a progressive scanning type, as a video signal for one screen in a progressive scanning system. .

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 is provided with control means for taking in the interlaced scanning type input video signal as one field video signal as one screen video signal in the progressive scanning mode. 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

As described above, since the input video signal of the interlaced scanning method is converted on a field basis, even if a fast moving video is displayed on the interlace driving panel, the video is not blurred.

Since 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 interlace drive panel, respectively, the video signal obtained by converting the input video signal of the odd field and the even field Does not become a signal indicating a video at the same position on the screen. Therefore, an image displayed on the interlace driving panel does not become an image having a reduced vertical resolution.

Furthermore, the video signal of each field of the interlaced scanning system is treated as a video signal of the progressive scanning system. Therefore, it is not necessary to newly develop a conversion means for the input video signal of the interlaced scanning system.

Also, in the scan converter according to the third aspect, as an example, when the input video signal of the interlaced scanning system is taken into the conversion means as the video signal of the progressive scanning system as described in the fourth embodiment. Preferably, the control unit controls the vertical scanning frequency of the video signal output from the conversion unit to match the vertical scanning frequency of the input video signal.

As a result, in the image displayed on the interlaced drive panel, passing noise of a moving image occurs due to a difference between the vertical scanning frequency of the input video signal and the vertical scanning frequency of the video signal output from the conversion means. Is also prevented.

In the scan converter according to the third aspect, as an example, as described in the fifth aspect,
It is preferable that the apparatus further includes a determination unit that determines a scanning method of the input video signal based on a vertical scanning frequency and a horizontal scanning frequency of the input video signal.

Thus, based on the result of the determination by the determination means, control according to whether the input video signal is a progressive scanning video signal or an interlaced scanning video signal (for example, as described in claim 4). Control) can be performed without error by the control means.

Alternatively, in the scan converter according to the third aspect, as described in the sixth aspect, an input is made from one of a plurality of input terminals corresponding to a video signal of a specific standard. It is also preferable to include a determination unit that determines a scanning method of the input video signal based on whether the video signal to be performed is selected.

Thus, based on the result of the discrimination by the discriminating means, the control means performs error-free control according to whether the input video signal is a progressive scanning video signal or an interlaced scanning video signal. Will be able to do it.

Although the progressive scan video signal is generally a still image signal, there are exceptionally progressive scan video signals, so that the progressive scan video signal is converted to a general progressive video signal. When the video signal input from the input terminal is selected by inputting from an input terminal different from the video signal of the scanning method, the determining means determines the scanning method of the input video signal as the interlace scanning method. Also becomes possible. Thus, when the moving image signal of the progressive scanning method is input, the control unit can perform the same control as when the video signal of the interlace scanning method is input.

[0040]

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.

Composite signal V output from 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.

Similarly, the signals of the lines L1, L2,... Of the odd-numbered and even-numbered screens are
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 interlaced scanning input signal 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 method). , 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 unit for the interlaced scanning signal). Number conversion and conversion to the progressive scanning method).

However, these conversion modes (a),
The processes in (b) and (c) of (b) and (c) are performed in (1) and (2) in the above-mentioned “Problems to be solved by the invention” section.
The processing is exactly the same as the processing in the scan converter of (2). Therefore, as will be described later, the microcomputer 17 also transmits the interlaced scanning primary color signals R, G, and B from the video processing / color reproduction circuit 2 to the microcomputer 17.
The scan converter 3 is operated in the conversion mode (a).

When the primary color signals R, G, 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, and 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.

Further, when the primary color signals R, G, 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 specified 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 performs 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 the vertical scanning frequency are set to 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.

Note that 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 synchronizing signal H and the vertical synchronizing 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, and B sent from the video processing / color reproduction circuit 2 are interlaced scanning signals, 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 primary color signals R, G, and B of the interlaced scanning system. 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.

Then, as shown in FIG. 5B, each line L2,
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, for each signal of the odd field and the even field, a signal indicating the video at the line position of the odd field and the even field of the screen of the PDP 10 is generated (that is, the input video of the interlaced scanning method). For signal, PDP1 in field units
Line number conversion is performed according to 0).

Here, when the interlaced scanning signal 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 signal of the line 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 it is determined that the primary color signals R, G, B sent from the video processing / color reproduction circuit 2 are 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 synchronization signal H and the vertical synchronization signal V sent from the scan converter 3 to the interface circuit 5 but outputs the signal from the selector 4. 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).

As described above, 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 at the time of conversion to the interlaced scanning method. 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, and B supplied from the scan converter 3 to the PDP 10 via the interface circuit 5 are synchronized.
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, if 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 method, even if a fast-moving video is displayed on the PDP 10, the video is not blurred.

Since the input video signals of the odd field and the even field are converted into the video signals of the odd field and the even field 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.

Moreover, the video signal of each field of the interlaced scanning system is treated as a video signal of the progressive scanning system, so that the progressive scanning video signal among the conversion modes of the scan converter 3 is converted into an 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. 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 the 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 method is generally a still image signal, it is a 525 progressive TV signal (4 signals because the number of effective lines is about 480 lines).
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 not limited. 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 interlace drive type PDP having 1024 lines. However, the present invention may be applied to an interlace 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.

Further, the interlace driving panel to which the present invention is applied may be either a panel used as a direct view type display or a panel used in a projection type 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.

[0097]

As described above, according to the scan converter for an interlace drive panel according to the first aspect of the present invention, even if a fast-moving image is displayed on the interlace drive panel, the image can be prevented from being blurred. And that an image displayed on the interlaced drive panel can be prevented from becoming an image having a reduced vertical resolution.

Further, according to the scan converter for an interlace drive panel according to the second aspect, an effect of preventing generation of overtaking noise of a moving image can be obtained.

Next, according to the scan converter for an interlace drive panel according to claim 3 of the present invention,
The effect of preventing the image from blurring even when displaying fast-moving images on the interlaced drive panel and the effect of preventing the image displayed on the interlaced drive panel from being reduced in vertical resolution can be prevented. can get.

Furthermore, the video signal of each field of the interlaced scanning system is treated as a video signal of the progressive scanning system, so that the conversion means for converting the video signal of the progressive scanning system into an interlaced video signal is used as it is. Since the input video signal is converted, the effect of shortening the design period and reducing the cost can be obtained.

Further, according to the scan converter for an interlace drive panel according to the fourth aspect, an effect that generation of overtaking noise of a moving image can be prevented can be obtained.

Further, according to the scan converter for an interlace drive panel according to the fifth aspect, the control according to whether the input video signal is a progressive scan video signal or an interlace scan video signal is performed without error. There is also obtained an effect that it can be performed.

According to the scan converter for an interlace drive panel according to the sixth aspect, the control according to whether the input video signal is a progressive scan video signal or an interlace scan video signal is performed without error. The same control can be obtained when a moving image signal of a progressive scanning method is input and the same control as when a video signal of an interlaced scanning method is input.

[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.

FIG. 9 is a diagram showing processing of an interlaced scanning video signal by a conventional scan converter and how a PDP screen is scanned.

[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 F-term (reference)

Claims (6)

[Claims] 1. A converter for converting video signals of an odd field and an even field of an input video signal of an interlace scanning system into video signals of an odd field and an even field of a screen of an interlace driving panel, respectively. Features a scan converter for interlaced drive panels. 2. The scan converter for an interlace drive panel according to claim 1, further comprising control means for matching a vertical scanning frequency of a video signal output from said conversion means with a vertical scanning frequency of said input video signal. A scan converter for an interlaced drive panel. 3. 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 interlaced driving panel, and converting an input video signal of the interlaced scanning system into a video for one field. And a control means for causing the conversion means to take in a signal as a video signal for one screen of a progressive scanning system. 4. The scan converter for an interlace drive panel according to claim 3, wherein the control unit is configured to output the input video signal of an interlaced scanning system to the conversion unit as a video signal of a progressive scanning system. A scan converter for an interlace drive panel, wherein a vertical scanning frequency of a video signal output from a conversion unit is made to coincide with a vertical scanning frequency of the input video signal. 5. The scan converter for an interlace drive panel according to claim 3, further comprising a determination unit configured to determine a scanning method of the input video signal based on a vertical scanning frequency and a horizontal scanning frequency of the input video signal. A scan converter for an interlaced drive panel. 6. The scan converter for an interlace drive panel according to claim 3, wherein a video signal input from one of a plurality of input terminals corresponding to a video signal of a specific standard is received. A scan converter for an interlace drive panel, further comprising: a determination unit configured to determine a scanning method of an input video signal based on selection.