JP2003198980A - Video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device which can display input video signals of a plurality of formats as a multi-screen picture with extremely high picture quality while minimizing increases in hardware scale and intricateness of signal processing. <P>SOLUTION: An inputted video signal is converted into an interlaced signal (1440i) with 1440 effective scanning lines and displayed as a picture (1). In the remaining area, interlaced signals (480i) with 480 effective scanning lines are displayed as pictures (2) to (4) while horizontally reduced by cyclically thinning out horizontal pixels without having, scanning lines thinned out. The pictures (2) to (4) do not have scanning lines thinned out, so they have the same picture quality vertically with the original video and are free of deterioration in picture quality. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device suitable for displaying video signals in a plurality of formats.

[0002]

2. Description of the Related Art In recent years, in a video display device such as a television receiver, it is necessary to display video signals in a plurality of formats with the start of digital broadcasting. The video signal format is 52 total scan lines.
Interlace with 5 lines and 480 effective scanning lines (480
i), the total number of scanning lines is 1125, the number of effective scanning lines is 1080, the interlace (1080i), the total number of scanning lines is 525.
Lines, progressive scanning with 480 effective scanning lines (480
p), there are 750 total scanning lines and 720 effective scanning lines (720p).

In these formats, the vertical frequency is the same, but the number of effective scanning lines per field is 480/2 in 480i and 10 in 1080i.
80/2, 480p 480, 720p 72
Each is different from 0. On the other hand, the horizontal frequency is
15.75 kHz for 480i and 33. for 1080i.
The difference is 31.5 kHz at 75 kHz and 480p, and 45 kHz at 720p.

When it is attempted to display all the video signals of these plural formats on the video display device, the horizontal scanning frequency of the video display device is set to 15.75 kHz, 3.
Switching at 3.75 kHz, 31.5 kHz, and 45 kHz can be considered. In this case, the image display device has 4
It must correspond to different horizontal scanning frequencies. Four
If an 80i video signal is converted to a 480p video signal by interlace-progressive (IP) conversion,
It suffices to support three types of horizontal scanning frequencies. Even with this, it is necessary to correspond to three types of horizontal scanning frequencies.
As the format to be displayed on the video display device, 1080
Unification to i is also being considered.

[0005]

As described above, in order to make a video display device compatible with video signals of a plurality of formats, for example, in the case of a display device using a cathode ray tube (CRT), the CRT of each format is changed. Since it is necessary to change the synchronization, a large voltage fluctuation occurs in the deflection circuit and a large load is applied to the deflection circuit. Even in a display device that does not use a CRT, it is a heavy burden on the drive circuit to support video signals of a plurality of formats.

Further, since it is necessary to resynchronize each time the format is switched, it is necessary to temporarily mask (blank) the display of the image on the screen due to a quality problem. Therefore, the control operation of the video display device becomes complicated, and the video is temporarily not displayed. As described above, making the video display device compatible with video signals of a plurality of formats causes various problems.

Therefore, in order to solve these problems,
The format displayed on the video display device may be unified to 1080i. However, the format is 1080
When unified to i, there are the following problems. When 480i is converted to 1080i, the number of scanning lines becomes 9/4 times,
When 720p is converted to 1080i, the number of scanning lines is 3/4
Doubled. Therefore, if the formats are unified to 1080i, the number of scanning lines is enlarged and reduced as a format conversion process, and the hardware scale of the interpolation filter forming the format conversion processing circuit is increased.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an image display device capable of converting input image signals of a plurality of formats into a single format which is the most practical. With the goal. Also,
An object of the present invention is to provide a video display device capable of displaying a video of extremely high image quality while minimizing an increase in hardware scale and complexity of signal processing. Another object is to provide a video display device capable of displaying a multi-screen with extremely high image quality.

[0009]

The present invention provides the following constitution in order to solve the above-mentioned problems of the conventional technique. (A) an interlaced signal with 480 effective scanning lines,
A first video signal is output which is one of an interlaced signal with 1080 effective scanning lines, a progressive signal with 480 effective scanning lines, and a progressive signal with 720 effective scanning lines. Video signal source (1
22), a second video signal supply source (123) for outputting a second video signal having an aspect ratio of 4: 3, which is an interlaced signal having 480 effective scanning lines, and an aspect ratio of 1
In a video display device having a 6: 9 display section (130), a conversion means (1000) for converting the first video signal into a third video signal which is an interlaced signal having 1440 effective scanning lines. A reducing means (1000) for reducing the second video signal in the horizontal direction by periodically thinning out pixels in the horizontal direction without periodically thinning out the scanning lines of the second video signal; A screen synthesizing unit (1000) for arranging the first video signal at one end portion in the horizontal direction of the display unit and synthesizing the remaining second region by arranging the second video signal reduced by the reduction unit.
An image display device comprising: (B) an interlaced signal with 480 effective scanning lines,
A first video signal is output which is one of an interlaced signal with 1080 effective scanning lines, a progressive signal with 480 effective scanning lines, and a progressive signal with 720 effective scanning lines. Video signal source (1
22) and the second to fourth video signal supply sources (123, 126, 12) which output the second video signal having an aspect ratio of 4: 3, which is an interlaced signal having 480 effective scanning lines.
7) and a display unit (130) having an aspect ratio of 16: 9, the first video signal is
Converting means (1000) for converting into a third video signal which is an interlaced signal with 1440 effective scanning lines, and pixels in the horizontal direction without periodically thinning out the scanning lines of the second to fourth video signals. By periodically thinning out the second video signal in the horizontal direction.
0) and the first video signal are arranged at one end of the display unit in the horizontal direction, and the second to fourth video signals reduced by the reduction means are applied to the remaining region in the vertical direction. Screen composition means (1000) for composition so that they are arranged side by side
An image display device comprising: (C) In an image display device having at least one video signal supply source (122, 123, 126, 127) that outputs a first video signal that is an interlaced signal with 480 effective scanning lines, 1440 effective scanning lines A display unit (130) capable of displaying a second video signal, which is an interlaced signal of a book, and a scanning line of the first video signal without periodically thinning the scanning line and without increasing the scanning line.
Substantially all the scan lines of the first video signal are transferred to the second
Assigning means (10
00), and a driving unit (13) for allocating and driving the second video signal to which the first video signal is partly allocated by the allocation unit to be displayed on the display unit.
1) An image display device comprising: (D) Effective scanning in a video display device having video signal supply sources (122, 123, 50) for outputting first to third video signals of a moving image or a still image which are interlaced signals with 480 effective scanning lines A display unit (130) capable of displaying a fourth video signal, which is an interlaced signal having 1440 lines, and a scanning line for scanning the scanning lines of the first to third video signals without periodically thinning the scanning lines. Without increasing the number, substantially all the scanning lines of the first to third video signals are assigned to the fourth video signal, and the first to third video signals are assigned.
Assigning means (100
0) and a drive unit (131) for driving the fourth video signal to which the first to third video signals are allocated by the allocation unit so as to be displayed on the display unit. Characteristic video display device.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A video display device of the present invention will be described below with reference to the accompanying drawings. 1 is a block diagram showing a configuration example of a video signal processing device used in the video display device of the present invention, FIG. 2 is a diagram showing scanning line conversion from 480p, 720p, 1080p to 1440p, and FIG. 3 is a configuration example of an interpolation filter. FIG. 4 is a block diagram showing 480p, 720
FIG. 5 is a diagram showing a phase offset in scanning line conversion from p, 1080p to 1440p, FIG. 5 is a diagram showing progressive-interlace conversion, FIG. 6 is a diagram showing a display example of a multi-screen, and FIG. 7 is a multi-screen shown in FIG. FIG. 8 is a block diagram showing a configuration example of a video signal processing device for realizing the above, and FIG. 8 is a block diagram showing an embodiment of a video display device of the present invention.

In the image display device of the present invention, no matter whether the input image signal is 480i, 1080i, 480p or 720p, the interlace (1440i) of 1440 effective scanning lines or 1440 effective scanning lines is used. It is characterized in that the format is converted to progressive (1440p). FIG. 1 shows a specific configuration for converting the format to 1440i or 1440p.
In the present embodiment described below, as the most preferable embodiment, the input video signal is 480i, 1080i, 480.
Although there are four types, p and 720p, it is not necessary for the video display device of the present invention to use all of these video signals as input video signals. The present invention can be applied to a case where any two or more of them are combined as an input video signal.

In FIG. 1, a 480i video signal supplied from a video signal supply source (not shown) is input to the IP converter 11 of the IP converter 1 and converted into a 480p progressive signal. It The 1080i video signal supplied from the video signal supply source (not shown) is I-
1080p when input to the IP converter 12 of the P conversion unit 1
Is converted to a progressive signal. The reason why the interlaced signal is converted to the progressive signal is that the amount of information in the field is increased and the enlargement / reduction processing in the enlargement / reduction unit 2 in the subsequent stage is performed with higher image quality.

In this embodiment, the IP converters 11 and 12 are used.
In the above, the conversion into the progressive signal is made, but the scanning line density may not be actually doubled, but interpolation data for making the progressive signal may be stored in a buffer or the like to generate a signal corresponding to the progressive signal. In short, it is sufficient that the signals have the number of scanning lines of 480p and 1080p.

480p output from the IP converter 11
Signal is input to the 6/2 converter 21 of the scaling unit 2. The 1080p signal output from the IP converter 12 is input to the 4/3 converter 23 of the scaling unit 2. 480p supplied from a video signal supply source (not shown)
The video signal of is directly input to the 6/2 converter 21. 7 supplied from a video signal supply source (not shown)
The 20p video signal is supplied to the 2/1 converter 22 of the scaling unit 2.
Entered in.

Here, the supply source of the video signal (not shown) is, for example, a receiving unit for digital television broadcasting,
It is an external device such as a video tape recorder or a video disc player. The format of the input video signal is discriminated, and a switching device (switch) is used. If it is 480i, it is sent to the IP converter 11, and if it is 1080i, it is sent to IP.
In the converter 12, if it is 480p, in the 6/2 converter 21,
If it is 720p, it is selectively supplied to the 2/1 converter 22.

6/2 converters 21 and 2/1 of the enlargement / reduction unit 2
The converter 22 and the 4/3 converter 23 receive the input 480
The number of scanning lines for each of the p, 720p, and 1080p signals is multiplied by 6/2, 2/1, and 4/3, respectively, to obtain 1440.
It is for converting to a p signal. In the present embodiment, all the processing for the signals of 480p, 720p, and 1080p is enlargement, so reduction processing is not necessary, but it is referred to as an enlargement / reduction unit in consideration of various display modes (reduced display etc.). FIG. 2 shows how the signals of 480p, 720p, and 1080p are subjected to scanning line conversion to 1440p.
As shown in FIG. 2, in the conversion from 480p, 720p, 1080p to 1440p, the number of scanning lines is 3 times, 2 times, and 4/3 times, respectively.

Therefore, the scanning line conversion processing for format conversion in the enlarging / reducing unit 2 is all performed by enlarging, and there is no information loss due to reduction during scanning line conversion as in the case of unifying to 1080i as described above. There is no. Further, since the interpolation ratios of the interpolation filters forming the 6/2 converter 21, 2/1 converter 22, and 4/3 converter 23 are simple integer ratios, the filter coefficient can be easily configured. Therefore, the 6/2 converters 21 and 2/1 converters 22,
The hardware scale of the 4/3 converter 23 is not so large.

This will be specifically described in comparison with the case of unifying to 1080i. The interpolation phase in each format, that is, the position of 1440p with respect to the input signal is 480p → {0,1 / 3,2 / 3} 720p → {0,1 / 2} 1080p → {0,3 / 4,1 / 2, 1/4}, and the enlarging / reducing unit 2 may include interpolation filters for the respective interpolation phases.

On the other hand, when unified to 1080i, 480p → {0, 4/9, 8/9, 3/9, 5/9, 2
/ 9,6 / 9,1 / 9} 720p → {0,2 / 3,1 / 3}, which means that an extremely large number of interpolation phases are generated as compared with the case of unifying to 1440p.

In the case of unifying to 1440p, the enlargement / reduction unit 2 can be composed of six sets of interpolation filters as described above, and therefore, only an adder is used as an interpolation filter without using a multiplier. It is possible to realize it accurately and on a small scale. On the other hand, in the case of unifying to 1080p, 10 sets of interpolation filters are required, so that it is necessary to use a multiplier that has a high calculation accuracy and a high degree of freedom of filter coefficients. Therefore, the hardware scale becomes large. In addition to this, since the denominator has a phase of 9, the interpolation accuracy also deteriorates.

The fact that the hardware scale can be reduced by the present invention will be described with reference to FIG. In Figure 3,
An interpolation filter having coefficients {1/2, 1/2} is taken as an example. In FIG. 3A and FIG. 3B, the same functional parts are designated by the same reference numerals. FIG. 3A shows a case where the interpolation filter is composed of the delay device 4 and the adder 5. The adder 5 in FIG. 3A is a 1/2 adder. A filter equivalent to the interpolation filter shown in FIG. 3A can also be realized by the delay unit 4, the adder 5, and the multipliers 6 and 7, as shown in FIG. 3B. The multipliers 6 and 7
Is for halving the input signal and outputting it.

The calculation accuracy of the configuration shown in FIG.
If it is the same as (A), the hardware scale is required to be about 33 times. This is because, assuming that the input signal is 8 bits, a multiplier of 8 bits input signal × 8 bits coefficient requires 16 adders. Although the configuration of FIG. 3A has no degree of freedom in the coefficient, the coefficient can be freely given within the bit precision.

As described above, in the present invention in which the format is unified to 1440p, the interpolation filter of the enlargement / reduction unit 2 can be realized by an adder, so that the hardware scale can be reduced. Further, even if the interpolation filter is realized by an adder in the case of unifying with 1080p, the hardware scale of the present invention with unifying with 1440p is smaller. Thus, the format is 1440
In the present invention, which is unified with p, the hardware scale can be reduced in comparison with the case where it is unified with 1080p, and since the interpolation filter can be configured by an adder, the hardware scale can be further reduced. is there.

Further, according to the present invention, it is possible to perform interpolation with high accuracy and with little deterioration in image quality. When the interpolation filter has a wide variety of phases as in the case of unifying to 1080p, there is a large difference in image quality depending on the phase, resulting in deterioration of image quality. This is because the vicinity of the phase of 0 or 1 preserves the component closest to the original signal, and the vicinity of the phase 1/2 where peripheral original signals are mixed has the highest high frequency component dropped. 1
If many interpolation phases exist in one image, interpolation fringes will be generated depending on the presence or absence of high frequency components. Therefore, many interpolation phases are required 1080p (1080i is the same)
1440p, which requires less interpolation phase than conversion to
(1440i is also the same), there is little deterioration in image quality,
High image quality.

By the way, in FIG. 2, 480p, 72
The interpolation phase of scanning line conversion from 0p, 1080p to 1440p has been described, but an output pixel of phase 0, which outputs the original pixel as it is, has a high band component as compared with other interpolation pixels. Therefore, in the scanning line conversion process in the scaling unit 2, the interpolation phase is uniformly offset as shown in FIG. By shifting the interpolation phase, it is possible to prevent image deterioration such as line flicker. The shift of the interpolation phase as shown in FIG. 4 can be easily realized by appropriately setting the coefficient of the interpolation filter.

Even if the sharpness of the image quality is somewhat lost by shifting the interpolation phase as shown in FIG.
Since it is possible to control the image quality by an enhancer or the like that compensates for high frequency components after the signal of 440p or 1440i is set, there is no problem.

Returning to FIG. 1, the 1440p signal output from the scaling unit 2 is input to the progressive-interlace (P-I) conversion unit 3. When the video signal processing device of the present invention outputs a 1440p signal or the video display device of the present invention displays a 1440p signal, the P-I converter 3 is not necessary. In this embodiment,
The case where the 1440i signal is finally output will be described. The P-I conversion unit 3 interlaces-converts the input 1440p signal and outputs a 1440i signal.

That is, as shown in FIG. 5, one scanning line of the 1440p signal is thinned out every two scanning lines, and the thinning phase is offset by one scanning line (one line) for each field. As a result, the 1440p progressive signal becomes a 1440i interlaced signal having a horizontal frequency of 45 kHz which is interlaced between the first field and the second field. The signal 1440i is output from the video signal processing device to the outside or displayed on a display unit such as a CRT of the video display device. In the case of a video display device, the output of the P-I conversion unit 3 is supplied to a drive circuit for driving the display unit, and the drive circuit drives the display unit to display an image.

In the case of a video display device using a CRT as a display unit, a deflection circuit capable of displaying a signal of 720p is used as a base, and the phase of vertical deflection is offset in accordance with the output phase of signal processing to obtain 1440i. Display the signal. Therefore, the image display device of the present invention can be realized by slightly improving the existing drive circuit (deflection circuit or the like). Even a dot matrix type display device compatible with interlace can display the signal of 1440i by writing the signal in accordance with the output field of the signal processing. Therefore, the image display device of the present invention can be realized without a significant increase in cost.

Further, in the I-P converter 1, as described above, the input signal of 480i or 1080i is not actually doubled in scanning line density, but only a signal corresponding to progressive is generated. In this case, it has the following advantages. In this case, the circuits after the enlargement / reduction unit 2 are all processed at the clock rate of 74.25 MHz, which is equivalent to that of the 720p format. 1
080i format clock is the same as 720p 7
Since it is 4.25 MHz, in terms of signal processing, upper 720p,
The signals of 1080i and 1440i can be processed with the same clock.

In this way, when the clocks are unified, the horizontal period and the horizontal effective pixel are 128, which is equivalent to 720p.
It becomes 0 pixels. Since the horizontal effective pixels of 1080i are 1920 pixels, the horizontal effective pixels are reduced from the original 1920 pixels to 1280 pixels by processing at 74.25 MHz.
In a consumer television receiver or a dot matrix type display device, 1280 pixels is practically sufficient. Of course, 1 horizontal effective pixel when converted to 1440i
You may increase the clock rate of the output of the P-I conversion part 3 so that it may be set to 920 pixels.

As described above, in the video display device of the present invention, since the video signal format is unified to 1440i (or 1440p), it is necessary to convert to a single format with an interpolation filter having a small hardware scale. Is possible. In addition to this basic effect, the present invention has an effect that a multi-screen can be displayed with extremely high image quality as follows. A case of displaying a multi-screen will be described with reference to FIGS.

In FIG. 6A, a screen having an aspect ratio of 4: 3 is displayed at the left end of a screen having an aspect ratio of 16: 9, and a screen having an aspect ratio of 4: 3 of 480i is displayed on the remaining portion. The case where ~ is displayed is shown. 1
Since the format of 440i is 480i × 3,
The 480i screens can be displayed side by side in the vertical direction. In this case, in the screens, the pixels in the horizontal direction are periodically thinned, and the size of the image is 1/4 in the horizontal direction.
However, it is not necessary to periodically thin scan lines in the vertical direction. Of course, it does not increase the scan lines either. Therefore, in the vertical direction, the image quality is the same as the original image, and the image quality is not deteriorated. The positions of the screen and the screens may be reversed.

As the screen-, a screen having an aspect ratio of 4: 3 of 480p may be displayed. In this case, a progressive signal of 480p may be converted into an interlaced signal, and image quality deterioration is extremely small.

The image of 1440i on the screen is 480i, 1080i, 480p, 720p as described above.
Is converted into 1440i.
Images with 1080i and 720p have an aspect ratio of 16: 9
In general, it is possible to perform the following processing in this case.

In the case of 1080i, the number of scanning lines is unchanged, the signal of 1080i is converted into the format of 1440i, and a black or gray non-image signal of 180i is added to the upper and lower portions thereof, respectively. Book of fourteen
40i signal. In the case of 720p, 108
0i, and similarly, the 1080i signal is converted to 1440i.
It is converted to the format of 180
A black or gray non-image signal of i is added and converted into a 1440i signal having 1440 scanning lines.

FIG. 6B shows a screen of 720i having an aspect ratio of 16: 9, which is a 720p signal converted into an interlaced signal, in a substantially central portion of the screen of aspect ratio of 16: 9.
Are displayed in a vertical arrangement. Also in this case, since the progressive signal is only converted into the interlaced signal, the image quality deterioration is extremely small. Figure 6
(C) is divided into 12 screens with an aspect ratio of 16: 9,
The screens a to l of 480i are displayed on the respective divided screens. In this case as well, in the screens a to l, pixels are periodically thinned out due to reduction in the horizontal direction, but it is not necessary to periodically thin out the scanning lines in the vertical direction, and therefore the original image quality is the same as that of the original image in the vertical direction. , There is no image quality deterioration.

An example of the configuration of a video signal processing device that realizes the above multi-screen will be described with reference to FIG.
The configuration example shown in FIG. 7 shows a case where a multi-screen that simultaneously displays a maximum of four moving pictures is realized. Input 1 to 4
Is a signal of any of 480i, 1080i, 480p, and 720p. The inputs 1 to 4 are input to the IP converters 101 to 104 of the IP converter 10, respectively. The inputs 1 to 4 are also input to the switching devices 401 to 404 of the switching unit 40. The switches 401 to 404 are the IP converter 10
Outputs 1 to 104 and inputs 1 to 4 are switched to a switching control signal (S
(WCTL) to selectively switch and output.

As described above, if the video signals input as the inputs 1 to 4 are interlaced signals such as 480i or 1080i, they are converted into progressive signals by the IP converters 101 to 104 and enlarged or reduced in the subsequent stage. Part 20
Need to be supplied to. If the video signals input as the inputs 1 to 4 are progressive signals such as 480p and 720p, it is necessary to supply the progressive signals as they are to the enlarging / reducing unit 20 in the subsequent stage. Switch 401-
Reference numeral 404 denotes the IP converters 101 to 10 according to the input signal.
It is for switching whether to use the output of No. 4 or to use the input signal as it is. The switching control signal (SW
CTL) can be easily generated by discriminating the formats of inputs 1 to 4.

The output of the switching unit 40 is input to the scaling unit 20. The enlarging / reducing unit 20 includes horizontal enlarging / reducing units 201H to 201H.
204H and vertical scalers 201V to 204V. The vertical scaling units 201V to 204V have the same configuration as the scaling unit 2 in FIG. That is, each of the vertical scalers 201V to 204V includes a 6/2 converter 21, a 2/1 converter 22 and a 4/3 converter 23, respectively.
However, the vertical scalers 201V to 204V may output the input signal as they are without converting to 1440p depending on the aspect of the multi-screen. Horizontal scaler 20
1H to 204H enlarges or reduces the horizontal direction according to each multi-screen.

In the example of FIG. 6A, inputs 1 to 1 of FIG.
4 corresponds to the screen, the vertical scaler 201V converts the input 1 into 1440p, and the vertical scalers 202V to 204V do not convert the inputs 2 to 4 into 1440p and output it as it is at 480p. . In the example of FIG. 6B, assuming that the inputs 1 and 2 in FIG. 7 correspond to the screen, the vertical scaler 201V inputs the inputs 1 and 144 into 144.
It is not converted to 0p and is output as it is at 720p. The horizontal reductions in the horizontal enlargement / reduction units 201H to 204H are according to the size of each screen. A method for realizing the multi-screen shown in FIG. 6C will be described later.

1440p output from the scaling unit 20
The signal of (480p or 720p in some cases) is P
It is input to the P-I converters 301 to 304 of the -I conversion unit 30. The P-I converters 301 to 304 convert the input progressive signal into an interlaced signal. Although not shown here, the P-I converter 30
A field signal is supplied to 1 to 304, and P-I converters 301 to 304 are based on the field signal.
Convert.

The outputs of the P-I converters 301 to 304 are input to the screen synthesis section 50. The screen synthesizing unit 50 is P-I.
The outputs of the converters 301 to 304 are combined to output a multi-screen 1440i video signal.

Next, a more specific structure of the image display device of the present invention will be described with reference to FIG. In FIG. 8, the signal wave (IF signal) of the television broadcast coming from the antenna 121 is input to the tuners 122 and 123. A channel switching signal is supplied to the tuners 122 and 123 from a control unit (not shown), and a detection signal is output in synchronization with a predetermined channel. The detection signals output from the tuners 122 and 123 are demodulated by the demodulator 1
The signals are input to 24 and 125, subjected to demodulation and other processing, and output as a video signal.

On the other hand, video signals from an external device such as a video tape recorder or a video disc player (not shown) are input from the external input terminals 126 and 127. Although only two external input terminals are shown here, the number of external input terminals may be three or more. External input terminals 126, 1
The video signal input from 27 is input to the switch 129 via the switch 128. The switch 128 is provided to select two of the external input terminals when there are three or more external input terminals, and can be omitted if the number of external input terminals is two.

The switch 129 is used for the demodulation units 124 and 125.
The four signals output from the switch 128 are supplied to the multi-screen processing unit 1000. Multi-screen processing unit 10
00 is the structure shown in FIG. The four outputs of the switch 129 correspond to the inputs 1 to 4 in FIG. The switch 129 is for switching how to arrange the inputs 1 to 4 on the multi-screen. The output of the multi-screen processing unit 1000 is the display unit 13 with an aspect ratio of 16: 9.
Supplied to zero. The display unit 130 is driven by the drive unit 131.

In the configuration of FIG. 8, the tuners 122 and 123
And the external input terminals 126 and 127 serve as video signal supply sources, respectively. If video signals are supplied to the multi-screen processing unit 1000 from each of these four video signal supply sources, all the multi-screens described with reference to FIGS. 6A and 6B can be displayed as moving images. As will be understood from the description below, the screen synthesis unit 50 of the multi-screen processing unit 1000 also serves as a video signal supply source that supplies a video signal that is a still image based on the video signal from the video signal supply source. ing.

In the above example, the case where the multi-screen is displayed as a moving image has been described, but all or part of the multi-screen may be a still image. Tuner 12 in the configuration of FIG.
6 only by the video signals output from 2,123.
An example of realizing the multi-screen of (A) will be described. The video signal output from the tuner 122 is processed by the multi-screen processing unit 1000 having the configuration shown in FIG.
And is displayed as the screen of FIG.

On the other hand, the tuner 123 cyclically and cyclically switches the reception channels at predetermined time intervals by the channel switching signal. As a result, the video signal output from the tuner 123 is switched every predetermined time. As shown in FIG. 8, the multi-screen processing unit 1000
The screen synthesizing unit 50, which constitutes a part of the above, includes a memory 51. The memory 51 stores at least the video signals of the past two channels before channel switching as a still image. Then, the video signal of the current reception channel is displayed as a moving image on one of the screens in FIG. 6A, and the still image stored in the memory 51 is displayed on the other two screens.

Also in the case of FIG. 6C, a multi-screen can be realized by similar processing. In this case, only one tuner (for example, the tuner 122) is used, and the reception channel is cyclically and sequentially switched at predetermined time intervals by the channel switching signal. The memory 51 stores at least the video signals of the past 11 channels before channel switching as a still image. The screens a to l of FIG. 6C are assigned to, for example, channels 1 to 12, the video signal of the current reception channel is displayed as a moving image on the assigned screen, and the remaining screens are stored in the memory 51. Display a still image.

By the way, in the display examples of the multi-screens shown in FIGS. 6A to 6C, each multi-screen is 1440.
Although expressed as i, 480i, and 720i, these do not necessarily mean that all effective scanning lines are displayed as respective screens. That is, as is well known, in a display unit using a CRT, part of the images at the upper and lower ends is not visually displayed due to overscan, and in the display unit other than the CRT, all the effective scanning lines are similarly displayed. is not. In addition, when arranging in the horizontal direction or the vertical direction of the multi-screen, a part of the image (pixel, scanning line) at the end in the horizontal direction or the vertical direction may be deleted. The deletion of a part of the image for the alignment is different from the reduction of the image by the periodic thinning.

In the present invention, the multi-screen processing unit 1000 is
Without periodically thinning the scan lines of the 480i video signal and without increasing the scan lines, all the scan lines of the 480i video signal are assigned as part of the 1440i video signal, and The video signal driving unit 131
Is also one of the features. In addition, the multi-screen processing unit 1000 does not periodically thin out the scanning lines of the three 480i video signals that are moving images or still images, and does not increase the scanning lines, and the substantial number of these three video signals is substantially reduced. All scan lines in 14
By assigning to the 40i video signal, three 48
One of the features is that the 0i video signals are arranged in the vertical direction, and the drive unit 131 displays the video signals on the display unit 130.

As can be seen from the above, the 1440i or 1440p is the currently existing 480i, 1080i, 480p, 7 while suppressing the increase in the hardware scale as much as possible.
It can be said that this is an extremely excellent format for practical use in that it can display all of 20p with high image quality. It is also an extremely excellent format in that it can display multi-screens with high image quality.

[0054]

As described in detail above, the video display device of the present invention can convert input video signals of a plurality of formats into a single format which is the most practical in use, by the above configuration. . Further, it is possible to display an extremely high quality image while suppressing an increase in hardware scale and complexity of signal processing to a minimum. Furthermore, the multi-screen can be displayed with extremely high image quality.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a video signal processing device used in the present invention.

[FIG. 2] 480p, 720p, 1080p to 1440
It is a figure which shows the scanning line conversion to p.

FIG. 3 is a block diagram showing a configuration example of an interpolation filter.

[FIG. 4] 480p, 720p, 1080p to 1440
It is a figure which shows the offset of the phase in the scanning line conversion to p.

FIG. 5 is a diagram showing P-I conversion.

FIG. 6 is a diagram showing a display example of a multi-screen.

7 is a block diagram showing a configuration example of a video signal processing device when realizing the multi-screen shown in FIG.

FIG. 8 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

1,10 interlace-progressive converter (I
-P conversion unit) 2,20 Enlargement / reduction unit 3,30 Progressive-interlace conversion unit (P
-I conversion unit) 11, 12, 101 to 104 IP converter 21 6/2 converter 22 2/1 converter 23 4/3 converter 40 switching unit 50 screen synthesis unit 122, 123 tuner 124, 125 demodulation Units 126, 127 External input terminals 128, 129 Switch 130 Display unit 131 Drive unit 201H to 204H Horizontal scaler 201V to 204V Vertical scaler 301 to 304 P-I converter 401 to 404 Switcher 1000 Multi-screen processing unit ( Allocation method)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 5/36 H04N 5/45 5/391 7/01 C H04N 5/262 G 5/45 G09G 5/00 520V 7/01 5/36 520G F term (reference) 5C023 AA02 AA14 AA38 BA11 CA01 DA01 5C025 AA25 BA02 BA05 BA27 BA28 5C063 AA01 AA07 AA11 AC01 BA01 BA03 BA06 BA14 5C08 CA05 DA06 BM03 DA03 CA53 DA03 5

Claims (5)

[Claims] 1. An interlaced signal having 480 effective scanning lines, an interlaced signal having 1080 effective scanning lines, a progressive signal having 480 effective scanning lines, and a progressive signal having 720 effective scanning lines. A first video signal supply source that outputs a first video signal that is any one of the following, and a second video signal that outputs an interlace signal having an effective scanning line number of 480 and an aspect ratio of 4: 3 In a video display device having a video signal supply source of No. 1 and a display unit having an aspect ratio of 16: 9, the first video signal is converted into a third video signal which is an interlaced signal having 1440 effective scanning lines. The conversion means and the scanning lines of the second video signal are not periodically thinned out, and the pixels in the horizontal direction are periodically thinned out, thereby contracting the second video signal in the horizontal direction. And the first video signal is arranged at one end of the display unit in the horizontal direction, and the second video signal reduced by the reduction means is arranged in the remaining area of the display unit. An image display device comprising: a screen synthesizing unit. 2. A channel switching means for sequentially changing the second video signal by sequentially switching the receiving channels of the tuner by using the second video signal supply source as a tuner, and two channels before channel switching. Is the video signal of
And a storage unit that stores the second video signal reduced by the reduction unit as a still image, wherein the screen combining unit causes the first video signal to be applied to one end of the display unit in the horizontal direction. Place it in the rest of the area,
2. The video display device according to claim 1, wherein three video signals of the video signal of the current reception channel and the video signals of the two channels reduced by the reducing means are combined so as to be arranged in the vertical direction. . 3. An interlaced signal having 480 effective scanning lines, an interlaced signal having 1080 effective scanning lines, a progressive signal having 480 effective scanning lines, and a progressive signal having 720 effective scanning lines. A first video signal supply source that outputs a first video signal that is any one of the following, and a second video signal that outputs an interlace signal having an effective scanning line number of 480 and an aspect ratio of 4: 3 In a video display device having a video signal supply source of 4 to 4 and a display unit having an aspect ratio of 16: 9, the first video signal is converted into a third video signal which is an interlaced signal having 1440 effective scanning lines. By converting the conversion means for converting and the scanning lines of the second to fourth video signals not periodically thinned, the pixels in the horizontal direction are periodically thinned,
Reducing means for reducing the second video signal in the horizontal direction; and the first video signal for arranging the first video signal at one end portion in the horizontal direction of the display section, and reducing the remaining area by the reducing means. An image display device comprising: a screen synthesizing unit that synthesizes the second to fourth video signals so as to be arranged side by side in the vertical direction. 4. An image display device having at least one video signal supply source for outputting a first video signal which is an interlaced signal having 480 effective scanning lines, wherein the interlaced signal has 1440 effective scanning lines. A display unit capable of displaying the second video signal, and substantially all of the first video signal without periodically thinning the scan lines of the first video signal and without increasing the scan lines. Allocating means for allocating the scanning line as a part of the second video signal, and displaying the second video signal to which a part of the first video signal is allocated by the allocating means on the display section. An image display device comprising a driving unit for driving. 5. A video display device having a video signal supply source for outputting first to third video signals of a moving image or a still image which is an interlaced signal having 480 effective scanning lines, and 1440 effective scanning lines. A display unit capable of displaying a fourth video signal which is an interlaced signal; and the first unit without periodically thinning the scanning lines of the first to third video signals and without increasing the scanning lines.
~ Allocation means for allocating substantially all the scanning lines of the third video signal to the fourth video signal and arranging the first to third video signals in the vertical direction; An image display device, comprising: a driving unit that drives the fourth image signal to which the third image signal is assigned to display the fourth image signal on the display unit.