JPH08181932A - Television receiver and television transmitter - Google Patents

Abstract

PURPOSE: To improve the quality in a multi-pattern display by detecting the display area and the scanning system in a multi-pattern and setting optimizingly the scanning system and the image adjustment state of each display area by the detection signal. CONSTITUTION: A period signal is given to an input terminal 2 and a deflection section 14 generates a correction current to apply raster scanning to a pattern and gives the correction current to a deflection yoke 8 to control a scanning speed. Furthermore, a video signal from the input terminal 1 is given to a signal processing section 3, in which various signal processing is applied to the signal. When an image signal is fed to a main screen 11 and a character signal is fed to a sub screen 12, an area of the sub-screen 12 is detected by a detection section 5 and given to an auxiliary deflection section 6, in which a signal controlling the scanning of the sub-screen area only is generated and the signal is fed to an auxiliary deflection yoke 7, then interlace scanning is applied to the main screen 11 and non-interlace scanning is applied to the sub screen 12. Thus, line flicker of the sub screen 12 is reduced so as to be suitable for character display. Thus, the multi-screen pattern suitable for each signal specification is displayed in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to images having different signal specifications,
A television receiver capable of optimally setting a scanning method such as sequential / interlaced scanning of a main screen and a sub-screen, and image adjustment such as brightness and contour compensation, and the like. It concerns a television transmitter.

[0002]

2. Description of the Related Art Currently, television signals (hereinafter abbreviated as image signals) are generally interlaced scans (hereinafter abbreviated as skip scans). For example, in the NTSC system, the number of images per second is 30.
The number of scanning lines is 525, and the number of images per second is 30 in the high-definition system (HD system) and the number of scanning lines is 1.
The specification is set to 125.

Computer signals including characters and figures such as CAD / CAM and workstations (hereinafter abbreviated as character signals) have various specifications in each device, but they are non-linear because of reduction of line flicker and high resolution.・ Interlaced scanning (hereinafter abbreviated as sequential scanning) is directed toward the high scanning frequency. At present, there are various computer signal sources with horizontal scanning frequency from around 20 kHz to 127 kHz, and there is a strong demand for fusion of television image signals and character or graphic signals such as computer terminals as multimedia-compatible display terminals. Has been done. In addition, the center of the computer OS is shifting from MS-DOS to Windows, and the need for multi-screen display is increasing.

As described above, a picture-in-picture system for displaying a multi-screen having a main screen and a sub-screen,
In order to simultaneously display a television signal and a computer signal on the display screen, there is a problem that a scanning method suitable for each signal specification must be set.

Therefore, as a method for controlling a scanning system such as interlaced scanning, Japanese Patent Laid-Open Publication No. 51-110914 (Japanese Patent Publication No. 55-
No. 50626) and Japanese Patent Laid-Open No. 51-110915.
The television receivers disclosed in U.S. Pat.

FIG. 28 shows a block diagram of a conventional television receiver. In FIG. 28, the horizontal synchronizing signal applied to the input is converted by the multiplier 115 into a signal having a frequency doubled in synchronization with the input signal (FIG. 29 (d)). Multiplier 11
5 can be realized by a phase locked loop, which is a voltage controlled oscillator 116 that oscillates around the frequency of the input signal,
A frequency divider 117 that divides the oscillation output by 1/2 and a bandpass filter 119 that smoothes a control voltage proportional to the phase difference between the divided signal and the input signal are included.
The voltage controlled oscillator 116 is designed to negatively feed back the input signal in the direction in which the phase difference between the output signals of the frequency divider 117 disappears. A signal synchronized with the input signal, which is the output of the voltage controlled oscillator 116, and having a doubled frequency is applied to the horizontal sawtooth wave generator 120 to generate a waveform for horizontal deflection and drive the horizontal deflection coil 121.

On the other hand, the output from the frequency divider 117 is synchronized with the input signal and has a duty cycle of 50%, and the waveform shaper 122 sets it to an appropriate level. The vertical synchronization signal (FIG. 29 (c)) applied to another input terminal is converted into a vertical sawtooth wave signal (FIG. 29 (e)) necessary for deflection by the vertical sawtooth wave generator 123. The correction signal (FIG. 29 (g)) output from the waveform shaper 122 is superimposed on the vertically deflecting sawtooth wave by the superimposing device 124, and the vertical sawtooth wave signal of FIG. 29A and by driving the vertical deflection coil 125, the scan before the scan conversion shown in FIG. 29A is converted into the scan after the scan conversion shown in FIG. 29B to perform the interlaced scan. I can do it.

[0008]

However, in the television receiver having the conventional structure as described above, it is possible to arbitrarily control the scanning system such as the sequential scanning or the interlaced scanning for the entire screen or each vertical direction, but the horizontal scanning is possible. There is a problem that the control cannot be performed on a region having a limited direction or an arbitrary region. Further, it is not possible to completely display images, characters, figures, etc. that are suitable for each signal specification only by controlling only the scanning method.

In view of the above point, the present invention detects a display area and a scanning method in a multi-screen and optimally sets the scanning method and the image adjustment state of each display area by the detection signal, thereby displaying in the multi-screen display. An object of the present invention is to provide a television receiver and a transmitter that can significantly improve quality.

[0010]

A first invention is a multi-screen display means for displaying a multi-screen input signal having a main screen and a sub-screen, and a display area detection for detecting a display area of the multi-screen display means. Means, a scanning method detecting means for detecting the scanning method of the display screen, and an auxiliary deflecting means for controlling the scanning method of the multi-screen based on the detection signals from the display area detecting means and the scanning method detecting means. .

A second aspect of the present invention includes a signal generating means for generating a plurality of signals, and a multi-screen signal generating means for combining a plurality of signals from the signal generating means on the same screen to generate a multi-screen signal. And a superimposing means for superimposing information on the display area and the scanning method during the blanking period of the signal from the multi-screen signal generating means.

A third invention is a multi-screen display means for displaying a multi-screen input signal having a main screen and a sub-screen, a display area detection means for detecting a display area of the multi-screen display means, and the display area. An image adjusting means is provided for controlling image adjustment such as brightness and contour compensation of multiple screens based on a detection signal from the detecting means.

According to a fourth aspect of the present invention, there are provided a signal generating means for generating a plurality of signals and a multi-screen signal generating means for combining a plurality of signals from the signal generating means on the same screen to generate a multi-screen signal. A superimposing means for superimposing a display area and image adjustment information in a blanking period of the signal from the multi-screen signal generating means.

A fifth aspect of the invention is a discriminating means for discriminating input signals of a multi-screen having a main screen and a sub-screen, and a control for controlling an amplitude and a frequency component of the input signal based on the discriminating signal from the discriminating means. And means for applying a signal from the control means to the cathode and the grid electrode of the cathode ray tube.

[0015]

According to the first aspect of the present invention, by controlling the scanning method such as interlacing or sequential scanning of each display area based on the detection signal which automatically detects the display area of the multi-screen and the scanning method,
It is possible to easily set the scanning method suitable for each signal specification.

According to the second aspect of the invention, in the transmitter for generating a multi-screen signal, the display area and the scanning system setting signal are multiplexed during the blanking period of the video signal, so that each of the receiver side signals can be received. The scanning method suitable for the signal specifications can be easily set.

According to the third aspect of the invention, the image adjustment state such as the brightness and contour compensation of each display area is controlled based on the detection signal which automatically detects the display area of the multi-screen, so that each signal specification can be satisfied. Suitable image adjustment can be easily realized.

According to the fourth aspect of the invention, in the transmitter which generates a multi-screen signal, the display area and the image adjustment state setting signal are multiplexed during the blanking period of the video signal, so that the receiver side Since image adjustment suitable for each signal specification can be realized, a clear multi-screen display is possible without line flicker.

According to the fifth aspect of the invention, the control of the cathode electrode drive and the parallel drive of the cathode and the grid electrode, and the amplitude ratio and the frequency component of the applied signal are controlled based on the discrimination signal obtained by discriminating the signals of multiple screens. By doing so, it is possible to easily realize gradation in image display in multi-screen display and wide band in character display, and it is possible to perform optimum multi-screen display according to signal specifications and performance.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a television receiver according to a first embodiment of the present invention, and FIG. 2 is a scanning line array diagram showing a state of scanning lines on a display screen.

In FIG. 1, reference numeral 1 is a main screen 11 and a sub-screen 1.
Input terminals to which multi-screen input signals having 2 are supplied, 2
Is an input terminal to which a synchronizing signal is supplied, 3 is a signal processing unit for performing various kinds of signal processing and amplification for driving a cathode electrode of a cathode ray tube (hereinafter abbreviated as CRT) 9, and 4 is a display screen 10.
Deflection unit for creating a correction current for raster scanning
Reference numeral 6 is a detection section for detecting a sub-screen area from the multi-screen video signal from the input terminal 1, and 6 is an auxiliary deflection section for controlling the scanning method based on the detection signal of the sub-screen area from the detection section 5. As shown in the scanning line arrangements 2 (b) and (d), the scanning method of the main screen and the sub screen is controlled.

The operation of the television receiver of this embodiment constructed as above will be described below. A synchronizing signal is input to the input terminal 2, a deflection unit 14 generates a correction current for raster scanning the screen, and the correction current is supplied to the deflection yoke 8 (including the convergence yoke) to control the scanning speed. ing. The video signal from the input terminal 1 is input to the signal processing unit 3, and the signal processing unit 3 performs various signal processing and amplification for driving the cathode electrode of the CRT 9.

In FIG. 2, the scanning lines of the first field and the second field are shown by a solid line and a broken line, respectively. As shown in FIG. 2A, the main screen 11 is supplied with image signals and the sub-screen 12 is supplied with multi-screen signals of character signals, and as shown in the scanning line arrangement diagram in the case of interlaced scanning on the main screen, All sub-screens are composed of interlaced scanning. An area of the sub-screen in the main screen shown in FIG. 2A is detected by the detection unit 5, and is supplied to the auxiliary deflection unit 6 to generate a signal for controlling scanning of only the sub-screen area. By supplying to the deflection yoke 7, the main screen (image signal) shown in FIG. 2B is composed of interlaced scanning and sub-screen (character signal) sequential scanning. Reduce flicker,
A scanning method suitable for displaying characters can be realized.

Similarly, in FIG. 2C, when a main screen and a sub-screen are supplied with a multi-screen signal of a character signal and a sub-screen of an image signal, both the main screen and the sub-screen are sequentially scanned. The area of the sub-screen in the main screen shown in FIG. 2 (c) is detected by the detection unit 5 and is supplied to the auxiliary deflection unit 6 to generate a signal for controlling the scanning of the sub-screen area, and this signal is used for the auxiliary deflection. By supplying to the yoke 7, the main screen (character signal) shown in FIG. 2 (d) is composed of sequential scanning and interlaced scanning of the sub-screen (image signal). The sharpness in the direction can be improved, and a scanning state suitable for image display of a television or the like can be realized.

As described above, in a television receiver for multi-screen display, the area of the sub-screen is detected, and the scanning system of the main screen and the sub-screen is controlled according to the signal specification, so that each signal specification is controlled. It is possible to perform multi-screen display suitable for.

Next, the detecting section 5 and the auxiliary deflecting section 6 of this embodiment.
The operation will be described in detail with reference to the block diagram of FIG. 3 and the waveform diagrams of FIGS. 4 and 5.

First, the operation of the detector 5 will be described. FIG. 4A shows a screen diagram when an image signal is displayed on the main screen and a character signal is displayed on the sub screen.
4B and an enlarged view of the sub-screen area shown in FIG. 4E, the multi-screen input signal is supplied to the differentiating circuit 13, and the correlation in the level direction of the input signal is detected by the first-order differential processing. As the output from the differentiating circuit 13, as shown in FIG. 4 (c) and an enlarged view of the sub-screen area, as shown in FIG. 4 (f), in the character signal area of the sub-screen or in the boundary area between the main screen and the sub-screen. A sudden level change will occur. The signal in which the correlation in the level direction is detected from the differentiating circuit 13 is supplied to the level detecting circuit 14 configured by a comparator or the like and compared with the reference potential VREF to display a sub-screen display area in which the level change is large. To be detected. The output from the level detection circuit 14 is shown in FIG.
As shown in (d), a signal obtained by detecting the inside of the character signal area of the sub-screen is output. Although the accuracy of area detection is lowered due to the frequency components of the signals displayed on the main screen and the sub-screen and the amount of level change, the comparison signal from the level detection circuit 14 is changed to CP.
It is possible to detect the origins (A to D) of the four corners of the sub-screen area shown in FIG. 4 (g) stably and with high accuracy by supplying it to U etc. and performing position calculation by averaging or linear approximation. Becomes

Further, as shown in FIG. 4 (h), the outer frame signal 70 (hatched portion) of a constant level is always provided at the boundary between the main screen and the sub screen.
By providing such as, the sub-screen area can be detected with higher accuracy. Since the same operation is performed in the sub-screen area detection in the vertical direction, description thereof will be omitted. As described above, as a method of detecting the display area of the sub-screen, the display area is detected and different signal sources such as image signals and character signals are determined by the correlation in the level direction.

Next, the operation of the auxiliary deflection section 6 will be described. The horizontal synchronizing signal of FIG. 5 (a) from the input terminal 2 and FIG.
The vertical synchronizing signal (b) is supplied to the control signal generation circuit 15 and the field discrimination circuit 19. Field discrimination circuit 19
Then, the first field and the second field are discriminated from the respective synchronization signals shown in FIGS. 5A and 5B, and the discrimination signal is output.
The control signal generation circuit 15 generates a control signal of a duty cycle of 50% in the vertical scanning cycle in which the polarity changes in each field as shown in FIG. 5C from the vertical synchronization signal and the determination signal from the field determination circuit 19. Is generated. The discriminating signal from the field discriminating circuit 19 is supplied to the scanning system detecting circuit 18 to detect the scanning state (interlaced scanning or sequential scanning) of the main screen, and from the state of FIGS. It can be seen that the scanning method of is interlaced scanning. FIG. 5C is a diagram showing a control signal with a duty cycle of 50% shown in FIG. 5C, a scanning system detection signal from the scanning system detection circuit 18, and a sub-screen area from the level detection circuit 14. 5
The detection signal of (d) is supplied to the switching circuit 16, and a control signal is generated to control the scanning method of only the sub-screen area shown in FIG. 5 (e). The setting of the control signal amplitude of FIG. 5 (e) in the switching circuit 16 is set so that it is an amplitude that moves only 1/2 of the scanning line interval from the detection signal of the number of scanning lines from the scanning method detection circuit 18. Has been done. The control signal from the switching circuit 16 is supplied to the drive circuit 17 for driving the auxiliary deflection yoke 7, and is controlled so that the scanning state of the sub-screen area shown in FIG. As another scanning method detecting method, the discrimination signal from the field discriminating circuit 19 is used as the scanning method detecting circuit 18 to detect the scanning method of the main screen instead of the level detecting method as described in the operation of the detecting section 5. It can be easily detected by a method of detecting the correlation of directions.

As described above, it can be understood that the method for controlling the scanning method can be easily realized by performing the auxiliary deflection of the offset on any one of the fields of the sub-screen area.

Next, the control principle of the scanning method by the auxiliary deflection will be described in detail with reference to the scanning line array diagram of FIG. As shown in FIG. 6 (a), which is a conventional scanning line arrangement diagram,
Both the image signal of the main screen 11 and the character signal of the sub screen 12 are interlaced to form the entire screen. 6 (b) and 6 (c) show a scanning line arrangement diagram in which scanning is controlled according to the present invention.
FIG. 6B shows the scanning lines of only the second field (broken line) of the sub-screen 12 moved upward, and FIG. 6C shows the scanning lines of the first and second fields of the sub-screen simultaneously moved to perform the interlaced scanning. Is converted to progressive scanning.

Further, as shown in the scanning line array diagram of the conventional system in FIG. 6 (d), the character signal of the main screen 11 and the image signal of the sub screen 12 are sequentially scanned to form the entire screen. Figure 6 (e)
Similarly, (f) shows a scanning line arrangement diagram in which scanning control is performed according to the present invention. As shown in FIG. 6 (e), the scanning line of only the second field (broken line) of the sub-screen 12 is moved downward. In (f), the scanning lines of the first and second fields of the sub-screen are moved at the same time to convert the sequential scanning to the interlaced scanning, and the scanning method suitable for each signal specification is realized.

Table 1 is a summary of the operations described in FIG.

[0034]

[Table 1]

As shown in Table 1, it can be seen that the control method differs depending on the control direction of the scanning method. This means that the scanning system detection circuit 18 needs to detect the scanning system of the main screen as described in FIG.

Next, a specific method of realizing the auxiliary deflecting means will be described in detail with reference to the block diagram of FIG. Generally, the frequency handled when performing scanning control in a CRT is about several tens of kHz for horizontal deflection and about several hundreds of kHz for convergence. However, in order to modulate the scanning speed only in a limited area in the horizontal direction as well as in the vertical direction as in the present invention, a frequency band of several tens of MHz or higher is required. Therefore, since the conventional deflection yoke 22 and the convergence yoke 20 cannot be used as the auxiliary deflection yoke for the auxiliary deflection means in the present invention, the vertical scanning state is controlled using the auxiliary deflection coil 21 for scanning speed modulation. ing. The inductance value of the scanning velocity modulation coil is several μH
Therefore, a band of several tens of MHz or more can be secured as a drive system.

The control signal from the switching circuit 16 in FIG. 3 is supplied to the amplifier circuit 23 and the power supply voltage control circuit 24. After being amplified in the amplifier circuit 23, it is supplied to the output amplifier circuit 25 configured by push-pull to drive the auxiliary deflection yoke. The signal from the output amplification circuit 25 is supplied to the current detection circuit 26 to detect the current, and this detection signal is output to the amplification circuit 23.
Is fed back to the current feedback type drive circuit.
In the power supply voltage control circuit 24, the power supply voltage supplied to the output amplification circuit 25 is set to be high only during the period when the control signal is present, thereby expanding the dynamic range and widening the band. Since a distortion due to a transient response occurs at the boundary between the main screen and the sub-screen, it is possible to make it inconspicuous by providing an outer frame signal or the like at a constant level at the boundary.

Next, a method for superimposing a setting signal having information on a display area of a multi-screen and a scanning method in the blanking period of the input signal and detecting the setting signal to automatically control the scanning method will be described. This will be described with reference to the block diagram of FIG. 8 and the waveform diagram of FIG. It should be noted that components that perform the same operations as those of the configuration shown in FIG.

The vertical and horizontal synchronizing signals of FIGS. 9A and 9B from the input terminal 2 are supplied to the control signal generating circuit 30 and the field discriminating circuit 19. The field discrimination circuit 19 discriminates between the first field and the second field from each synchronization signal and outputs a discrimination signal. The control signal generating circuit 30 has a vertical synchronizing signal and a control signal having a duty cycle of 50% in the vertical scanning cycle in which the polarity changes in each field as shown in the discrimination signal from the field discrimination circuit 19, as shown in FIG. The signal for extracting the preset setting signal of e) is generated. Figure 9 (b) from input terminal 1
The multi-screen signal on which the setting signal is superimposed during the blanking period of the input signal shown in (4) is supplied to the setting signal extracting circuit 27, and the setting signal is extracted. The video signal from which the setting signal on which the blanking period has been superimposed is removed is supplied to the conventional signal processing unit. The setting signal as shown in FIG. 9C is composed of, for example, a serial signal. The serial signal is an address signal (A3 to A) for designating various setting modes.
0) and data signals (D10 to D0) are multiplexed,
FIG. 9E shows a list of setting modes. The setting signal from the setting signal extracting circuit 27 is supplied to the setting signal detecting circuit 28, and the data of various setting modes are detected. Since the detection method needs to be read in synchronization with the serial signal of FIG. 9C, the clock signal and the load signal from the control signal generation circuit 30 are shown in FIGS. 28, the load signal of FIG.
Data is detected at the positive edge of the clock signal (d), and the total display area, start area, end area, dot frequency, number of scanning lines, and scanning method in each scanning direction are detected. In this way, the serial setting signal in which the blanking period is superimposed is detected, and a signal based on the display area of the sub-screen or the scanning method is created.

Next, a case will be described in which, instead of the serial setting signal shown in FIG. 9C, timing setting signals representing direct coordinates are multiplexed as shown in FIGS. 9G to 9J. The first signal S10 in FIGS. 9 (g) and 9 (h) is a signal for setting the scanning method. For example, when the signal is high, the interlace scanning is performed.
When (i) and (j) are low, sequential scanning is set and the signal also indicates the start point of each display area. 9 (g)-(j)
The second signals S11, S14, S18, S21 shown in FIG. 3 are the start regions of the sub-screen 12, and the third signal S1 shown in FIG.
Reference numerals 2, S15, S19, and S22 indicate end areas of the sub-screen 12, and fourth signals S13, S16, S20, and S23 shown in the figure indicate end points of the display areas. 9 (g) (i) is in the vertical direction,
9 (h) and (j) are horizontal timing signals. Therefore, by detecting and controlling the setting signal based on the display area of the sub-screen and the scanning method from the setting signals shown in FIGS. 9 (g) and (h), the scanning within the sub-screen 12 shown in FIG. 9 (k) is performed. The system is controlled to interlace scanning, and the scanning system in the sub-screen 12 shown in FIG. 9 (l) is controlled to progressive scanning by the setting signals shown in FIGS. 9 (i) and (j).

As described above, according to this embodiment, the scanning method such as the interlace or the sequential scanning is controlled in the multi-screen display area based on the detection signal which automatically detects the sub-screen area on the screen, Since display conditions suitable for signal specifications can be realized, it is possible to display a clear multi-screen display with no noticeable line flicker.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a block diagram of a television transmitter according to the second embodiment of the present invention.

In FIG. 10, reference numeral 31 is a television signal generating circuit for generating an image signal of NTSC or HD system, 3
2 is a computer for generating a character signal such as a computer
A signal generating circuit 33, a synthesizing circuit for synthesizing the signals from the television signal generating circuit 31 and the computer signal generating circuit 32 on the same screen, and 34 a signal conversion (scan conversion) or serial in the synthesizing circuit 33. CPU controlling signals,
Reference numeral 36 denotes a serial signal generating circuit for generating a serial signal for setting information on a display area and a scanning method under the control of the CPU 36, and 35 denotes a signal output from the serial signal generating circuit 36 during a blanking period of the video signal from the synthesizing circuit 33. A superimposing circuit that superimposes a serial signal. The same elements as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The operation of the television transmitter of the second embodiment constructed as above will be described with reference to the waveform chart of FIG. FIG. 11A from the television signal generating circuit 31.
HD system scanning line 1125 (horizontal scanning frequency = 3
The image signal of 3.75 kHz and the number of effective display dots in FIG.
0 dots x 1024 dots (horizontal scanning frequency = 64 kHz
The character signal of z) is supplied to the synthesizing circuit 33, and the character signal of FIG.
As shown in FIG. 7, the image signal is displayed on the main screen 11 and the character signal is displayed on the sub screen 12 so as to be combined. In the case of signal synthesis with different scanning frequencies, the character signal of FIG.
Since it is necessary to match the scanning cycle of the image signal of
The signal is converted as shown in 1 (c). The signal-converted character signal of FIG. 11C and the image signal of FIG. 11A are combined, and a combined signal shown in FIG. 11D is output from the combining circuit 33. The CPU 34 controls the signal conversion in the synthesizing circuit 33 and the signal generation in the serial signal generating circuit 36. The serial signal generating circuit 36 generates a serial signal for setting the display area and the scanning method of FIG. 11 (f), and it is supplied from the synthesizing circuit 33 to the superimposing circuit 35 together with the image signal, as shown in FIG. 11 (g). The multi-screen video signal in which the serial signal is superimposed in the vertical blanking period is output terminal 37.
Output from The setting modes of the serial signal are the same as those shown in FIG. Further, the signal conversion in the vertical direction is also the same as that in the horizontal direction, and therefore its explanation is omitted.

As described above, according to this embodiment, in the transmitter for generating the signals of the main screen and the sub screen on the screen, the information of the display area and the scanning method is multiplexed during the blanking period of the video signal. Since scanning suitable for each signal specification (image, character or graphic display) on the receiver side can be automatically realized,
A clear multi-screen display is possible without line flicker.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a block diagram of a television receiver according to the third embodiment of the present invention.

In FIG. 12, reference numeral 38 denotes an image adjusting unit for controlling image adjustment such as brightness and contour compensation based on the detection signal of the sub-screen area from the detecting unit 5. The same elements as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The operation of the television receiver of this embodiment constructed as above will be described with reference to the waveform diagrams of FIGS. 13 and 14.

FIG. 13A shows a display screen diagram in the case where a main screen is supplied with an image signal (staircase wave pattern) and a sub screen is supplied with a multi-screen signal of a character signal (H character pattern). FIG.
The area of the sub-screen in the main screen shown in (a) is detected by the detecting unit 5, and is supplied to the image adjusting unit 38 to control the image adjustment such as brightness and contour compensation only in the sub-screen area. Figure 13 (a)
As shown in the horizontal waveform diagram of the display screen of FIG. 13 (b), the signals are input at constant brightness of the main screen and the sub-screen, but as shown in FIG. 13 (c) by the image adjusting unit 38. By controlling to reduce the brightness of the sub-screen area only,
The image signal of the main screen shown in FIG. 2B can display a high-luminance and high-contrast image, and the character signal of the sub-screen can display a low-luminance and high-resolution image, reducing line flicker in the character area of the sub-screen. Thus, image adjustment suitable for character display can be realized. As described in the first embodiment, the discrimination between the image signal and the character signal can be easily detected by performing the correlation in the level direction of the input signal or the field discrimination.

Further, FIG. 14 (a) shows an enlarged waveform diagram of video signals of the main screen and the sub-screen supplied to the input terminal 1. Conventionally, as shown in FIG. 14 (b), both the main screen and the sub-screen have the same waveform. However, in the present invention, as shown in the contour compensation operation diagram of FIG. 14C, the operation of only the sub-screen area is stopped and only the sub-screen area of FIG. 14D is performed. By controlling so as to stop the contour compensation of, the sharp image can be displayed in the image signal of the main screen and the high-resolution image without the blooming phenomenon of the CRT can be displayed in the character signal of the sub screen shown in FIG. 14 (d). , It is possible to reduce the line flicker in the character area of the sub-screen and realize image adjustment suitable for character display. In addition, by using together with the brightness control described in FIG.
It is possible to reduce the luminance of the sub-screen area 4 (e) and stop the contour compensation to realize image adjustment suitable for character display.

As described above, in the television receiver for multi-screen display, the area of the sub-screen is detected and the image adjustment such as the brightness and contour compensation of the main screen and the sub-screen is controlled according to the signal specifications. Thus, multi-screen display suitable for each signal specification can be performed.

Next, the operation of the image adjusting section 38 of this embodiment will be described in detail with reference to the block diagram of FIG. 15 and the waveform diagrams of FIGS. 16 and 17.

FIG. 16A shows a screen diagram when an image signal is displayed on the main screen 11 and a character signal is displayed on the sub screen 12. The input signal of the multi-screen shown in FIG. As described with reference to FIG. 3, the detection unit 4 including the differentiating circuit 13 and the level detecting circuit 14 detects the correlation between the levels and detects the character signal of the sub-screen of FIG. 16C. The display area of is detected. The detection signal from the detection unit 5 that detects the sub-screen area is supplied to each circuit in the image adjustment unit 38, and the brightness and contour compensation of the character signal area are controlled.

Input signals from the input terminal 1 to the multi-screen shown in FIG. 16 (b) are supplied to the gain control circuit 39, and are controlled so as to reduce the gain only in the character signal area based on the control signal from the detection section 5. Then, the signal shown in FIG. 16D is output from the gain control circuit 39. This output signal is supplied to the contour compensating circuit 40 for performing electrical contour compensation, and the contour compensating operation of the character signal area is performed based on the control signal from the detecting unit 5 as shown in FIG.
The operation of only the character signal area is stopped as shown in FIG.
The signal shown in (f) is output from the contour compensation circuit 40. This signal is applied to the cathode electrode of the CRT after direct current reproduction in the clamp circuit 41 and amplification in the video output circuit 42.

Further, the signal from the gain control circuit 39 is supplied to a primary differentiating circuit 43 for performing contour compensation by scanning velocity modulation, subjected to a primary differential processing, and then input to a gain control circuit 44. The gain control circuit 44 stops the operation only in the character signal region based on the control signal, and the signal shown in FIG. 16 (g) is output from the gain control circuit 44. This signal is a driving circuit 4 for driving the scanning speed modulation coil 46.
16 (h) by supplying the data to the No. 6 and performing the auxiliary deflection.
The scanning velocity modulation signal is superposed on the horizontal deflection current of (1) to perform contour compensation by scanning velocity modulation.

In this embodiment, the case where both the electric contour compensation and the contour compensation by the scanning velocity modulation are stopped only in the character signal region has been described. Further advantages can be obtained by knowing the contour compensation method and the contour compensation method by scanning velocity modulation capable of performing compensation in a narrow band with high brightness. In the character signal area, the operation of the contour compensation by scanning velocity modulation is stopped and the electrical contour compensation is operated, so that the sharpness in the character signal area of low luminance can be improved.

Next, regarding a method of superposing a setting signal for setting information of image adjustment of multiple screens during the blanking period of the input signal and detecting the setting signal to automatically control the image adjustment,
This will be described with reference to the block diagram of FIG. 17 and the setting mode list diagram of FIG. The operation waveforms are the same as the contents shown in FIGS.

The multi-screen signal on which the setting signal is superimposed during the blanking period of the input signal from the input terminal 1 is supplied to the setting signal extracting circuit 47, and the setting signal is extracted. The video signal from which the setting signal from which the blanking period has been superimposed is removed is supplied to the image adjustment unit 38 and performs the same operation. The setting signal is composed of a serial signal as shown in FIG. 9C, and the serial signal is an address signal (A3 to A0) for designating various setting modes and a data signal (D1).
0 to D0) are multiplexed, and FIG. 18 shows a list of setting modes in image adjustment. Setting signal extraction circuit 4
The setting signal from 7 is supplied to the setting signal detection circuit 48,
Data of various setting modes is detected.

As shown in each setting mode in FIG. 19, a start area and an end area in each scanning direction for setting a sub-screen area, contrast (gain) data for setting an image adjustment state, and an aperture. (Contour compensation) data, aperture boost frequency data, and contour compensation operation / stop setting signal are detected. The sub-screen area and the image adjustment state are controlled based on this setting signal. Note that the control of the boost frequency in contour compensation can be easily realized by introducing, for example, a 1st to 2nd derivative processing using a delay property and switching the delay time. Further, the discrimination between the image signal and the character signal can be easily detected by the data of the setting mode such as the boost frequency.
If necessary, signals in which the scanning method of the main screen and the sub screen are set may be superimposed.

As described above, according to this embodiment, image adjustment states such as brightness and contour compensation in the main screen and sub-screen areas on the screen are detected based on the detection signals obtained by automatically detecting the sub-screen area on the screen. Since it is possible to realize display conditions suitable for each signal specification by controlling the display, line flicker is not noticeable and a clear multi-screen display is possible.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a block diagram of a television transmitter according to the fourth embodiment of the present invention. In FIG. 19, reference numeral 31 denotes a television signal generation circuit for generating an image signal of NTSC or HD system, 32
Is a computer signal generating circuit for generating a character signal such as a computer signal, 33 is a synthesizing circuit for synthesizing the signals from the television signal generating circuit 31 and the computer signal generating circuit 32 on the same screen, 49 Is a CP that controls signal conversion (scan conversion) in the combining circuit 33 and serial signals
U and 50 are serial signal generation circuits that generate serial signals for setting information of display areas and image adjustment under the control of the CPU 36, and 51 is a serial signal generation circuit 50 during the blanking period of the video signal from the synthesis circuit 33. It is a superimposing circuit that superimposes the serial signal from. FIG. 1 of the second embodiment
Those performing the same operation as 0 are designated by the same reference numerals, and the description thereof will be omitted.

The operation of the television transmitter of the fourth embodiment constructed as described above is the same as the operation described with reference to FIG. 11, and the detailed description thereof will be omitted. 1125 HD scanning lines from the television signal generation circuit 31 (band = 3
Image signal of 0 MHz, boost frequency = 16 MHz, M horizontal scanning frequency = 33.75 kHz), and characters with the number of effective display dots from the computer signal generating circuit 32 being 1280 dots × 1024 dots (bandwidth = about 100 MHz, horizontal scanning frequency = 64 kHz) The signals are combined and the combined signal is output from the combining circuit 33. The CPU 49 controls the signal conversion in the synthesizing circuit 33 and the signal generation in the serial signal generating circuit 50. A serial signal for setting a display area and an image adjustment state is generated from the serial signal generation circuit 50, supplied to the superposition circuit 51 together with the image signal from the synthesis circuit 33, and the serial signal is superposed during the vertical blanking period. The video signal of the screen is output from the output terminal 52. The setting modes for serial signals are shown in FIG.
Since it is the same as item 8, the description thereof is omitted.

As described above, it is easy to make a simple signal discrimination to set the optimum image adjustment even if the specifications are predetermined such as an image signal, but it is optimum for a wide variety of specifications such as a computer signal. Image adjustment cannot be performed.
Therefore, by multiplexing setting signals for setting signal specifications and image adjustment states, image adjustment suitable for each signal specification can be automatically performed.

By standardizing the multiplexing of such setting signals, it is not necessary to optimize the image adjustment items for each signal specification and to detect the sub-screen area on the receiver side, which is simple. It is possible to realize high image quality in a multi-screen display device with various configurations.

As described above, according to this embodiment, in the transmitter for generating the signals of the main screen and the sub screen on the screen, the setting signals of the display area and the image adjustment state are multiplexed during the blanking period of the video signal. As a result, the image adjustment suitable for each signal specification on the receiver side can be automatically realized, and a clear multi-screen display can be made without the line flicker being conspicuous.

Next, a television receiver according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG.
FIG. 9 is a block diagram of a television receiver according to a fifth embodiment of the present invention.

In FIG. 20, reference numerals 53 and 54 denote a gain control circuit for controlling the polarity, amplitude, band, etc. of the video signal, and 55 a signal discrimination for discriminating a multi-screen signal from a multi-screen video signal from the input terminal 1. 56, 57 are video output units for amplifying video signals to a level for driving a CRT, 58 is a cathode electrode which is the first electrode of the CRT 9, 5
Reference numeral 9 is a grid electrode which is the second electrode. In addition, first to
Those performing the same operations as in the fourth embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the television receiver of the fifth embodiment constructed as above, the relationship diagram of FIG. 21 and FIG.
The operation will be described with reference to the operation waveform diagram of No. 2. FIG. 21 shows a relationship diagram between the horizontal scanning frequency and the required band. The horizontal scanning frequency and the required band are in a proportional relationship as indicated by the solid line. Further, it can be seen that the image signal of NTSC or HD (high definition) (broken line) is distributed in the low scanning frequency region, and the character signal of a computer (dotted line) is distributed in the high scanning frequency region.

As shown in FIG. 22A, an image signal on the main screen and a multi-screen video signal of a character signal on the sub-screen area 60 are input to the input terminal 1, and the gain control circuits 53 and 54 and the signal discriminating unit 55 are input. Is supplied to. The signal discriminating unit 55 discriminates the display area and the signal based on the correlation in the level direction similarly to the detecting unit 5 described in the first embodiment. The discrimination signal from the signal discrimination unit 55 is supplied to the gain control circuits 56 and 57, and controls the polarity, amplitude, band, etc. of the video signal.

In the image signal (ramp pattern) of the main screen of FIG. 22A, the gain control circuit 56 on the grid electrode 59 side is used.
Is turned off and the gain control circuit 57 for the cathode electrode 58 is turned on. Therefore, as shown in FIG.
The negative video output signal shown in FIG.
A DC potential shown in FIG. 22 (c) is applied to.

In the character signal in the sub-screen area 60 of FIG. 22A, both the gain control circuits 56 and 57 on the grid electrode 59 side and the cathode electrode 58 side are turned on. Therefore, the negative polarity video output signal shown in FIG. 22D is applied to the cathode electrode 58, and the positive polarity video output signal shown in FIG. 22E is applied to the grid electrode 59. 22 (d) (c) and (e)
(f) shows the relationship of the potentials actually applied, in which the cathode applied voltage is the positive potential, the grid applied voltage is the negative potential, and the intermediate 0V potential exists.

That is, based on the result of signal discrimination by the signal discriminating section 55, the cathode electrode is driven when the image signal is lower than, for example, the horizontal scanning frequency fH1 shown in FIG. 21, and the cathode and grid electrodes are driven when it is higher. Thus, the gain control circuits 53 and 54 are controlled. Therefore,
The final drive waveform is shown in FIG.
The negative video output signal shown in 2 (f) is applied to the grid electrode 5
The video output signal of positive polarity shown in FIG. In this way, only the sub-screen area 60 where the character signal on the screen is displayed drives the cathode and the grid electrode.

The performance required for the display is different between the display of the image signal and the character signal, and the operation is performed so that the electrode drive system is emphasized in the gradation property in the image signal display and in the band and the rising or falling characteristics in the character signal display. Controlled. Since the drive voltage for driving the cathode electrode is about twice as large as that for driving the cathode and the grid electrode in parallel, the power supply voltage of the video output unit is controlled to be set high. As described above, the case where the application operation is forcibly operated / stopped so that the one-electrode drive is performed for the image signal and the two-electrode drive is performed for the character signal has been described.

Next, in order to explain the case of controlling the amplitude ratio of the applied signals when the two electrodes are driven according to the discrimination signal, the operation waveform diagram of FIG. 23 and the emission characteristic diagram of the 7-type projection tube of FIG. To use. As shown in FIG. 24, which shows emission characteristics of a 7-inch projection tube, which is often used for general projection-type displays, when a cathode (K) and a grid (G) are applied, it is about 40% when the cathode is applied as compared with when the grid is applied. Good sensitivity,
Further, the curve of the light emission characteristic is a linear characteristic when the cathode is applied, whereas it is a relative linear characteristic when the grid is applied. Figure 23 (a)
(b) shows respective applied waveforms when the video output signal (VK10 = VG10) having the same amplitude is applied to the cathode and the grid electrode. The cutoff voltage (VCF) of each applied signal up to the pedestal potential (VPED to -VPED) is applied so that it is always constant. From the light emission characteristics of FIG. 24, in order to make the light emission sensitivities when K is applied and when G is applied, it is necessary to set the grid application signal about 40% larger than the cathode application signal. As shown in FIGS. 23 (c) and 23 (d), which show the applied signals when the sensitivity is the same, the grid signal amplitude (VK11 <VG11) is larger than the cathode signal amplitude (VK11) by about 40%. To be done. Further, since gradation is important when displaying an image signal, the cathode application condition, which is a linear emission characteristic, is more advantageous. Therefore, as shown in FIGS. By setting the amplitude ratio so that a signal whose VK12) is larger than the grid signal amplitude (VK121> VG12) is applied, it is possible to display an image with excellent gradation.

As described above, in the display of the image signal, the gradation is emphasized and the K applied amplitude is set to be large. In the display of the character signal, the band and rising or falling characteristics are emphasized, and the cathode and grid applied amplitudes are almost equal. The amplitude ratios are set so that they are equal or have the same light emission sensitivity.

Next, the block diagram of FIG. 25 and the characteristic diagram of FIG. 25 are used in order to explain the case of controlling the frequency component of the applied signal when two electrodes are driven according to the detection signal.

In FIG. 25, 61 is a high-pass filter for extracting the high-pass components of the video signal, and 62 is a low-pass filter for extracting the low-pass components of the video signal.

FIG. 27 shows a concrete configuration diagram of the high-pass filter 61 and the low-pass filter 62 for extracting the high band and the low band of the video signal. A signal having a high cutoff frequency (fCS) shown in FIG. 26A is supplied to the input terminal 1 to the low pass filter 62 and the subtractor 63. Low pass filter 6
Reference numeral 2 denotes the frequency characteristic of the low cutoff frequency (fC1) shown in FIG. 26 (b). The low-pass component signal from the low-pass filter 62 is supplied to the video output unit 57, and after amplification, the cathode electrode 58. Applied to. The input signal having the characteristic shown in FIG. 26 (a) and the signal from the low pass filter 62 having the characteristic shown in FIG. 26 (b) are supplied to the subtractor 63 and subjected to subtraction processing to obtain the high signal shown in FIG. 26 (c). A subtraction signal of the range component is output.
The signal of the high frequency component from the subtractor 63 is supplied to the video output unit 56, amplified, and then applied to the grid electrode 59, and C
The electron beams on the RT are added, and the display screen of the characteristics shown in FIG. 26D is displayed.

Next, the reason why the low frequency component is applied to the cathode electrode and the high frequency component is applied to the grid electrode will be described. FIG.
As described above, the linear emission characteristic is obtained when the cathode (K) is applied, while the relative linear emission characteristic is obtained when G is applied. This means that the gradation is lost when the grid (G) is applied (change in chromaticity). Generally, a detection source of human chromaticity change is more noticeable as a low-frequency signal and less noticeable as a high-frequency signal.

For the above reasons, in the two-electrode drive, the low-frequency component whose chromaticity change detection source is high is applied to the cathode electrode having a linear emission characteristic, and the high-frequency component whose chromaticity change detection source is low is a nonlinear emission characteristic. By applying to the grid electrode, it is possible to significantly reduce the change in chromaticity when driving two electrodes.

As described above, by controlling the driving of the cathode electrode and the parallel driving of the cathode and the grid electrode according to the result of the signal discrimination, and controlling the amplitude ratio and the frequency component of the applied signal, the image display It is possible to easily realize gradation and wide band for displaying characters, and it is possible to display an optimal multi-screen according to signal specifications and performance.

In this embodiment, the raster scanning type display device using the direct-view CRT has been described for easy understanding, but it is also effective for other projection type display devices. Needless to say. Further, in the present embodiment, as the method for detecting the sub-screen area, the case where the sub-screen area is detected from the correlation in the level direction or the outer frame signal has been described, but another method may be used. Further, although the case where the scanning method and the control of the image adjustment are separately performed has been described in the present embodiment, they may be used together.
In this embodiment, the case where the scanning method and the image adjustment control are separately performed has been described, but they may be used together. Further, although the case where the display area is detected and the scanning method and the image adjustment are controlled has been described in the present embodiment, it goes without saying that the detection of the display area is not necessary if the display area is determined in advance. Further, in the present embodiment, the case where two different types of signal sources are displayed on the two screens of the main screen and the sub screen has been described for easy understanding.
The same applies when displaying two or more screens.

Further, in the first and second embodiments, the case where the auxiliary deflection yoke is used as the method for controlling the scanning method such as the interlace has been described, but other methods may be used.

Further, in the third to fourth embodiments, the case where luminance and contour compensation are performed as the control items of the image adjustment state has been described, but other items may be performed.

In addition, in the first to fourth embodiments, the case where various setting signals to be superimposed on the input signal are performed in the serial signal form or the timing signal form representing the direct coordinates has been described, but in other forms. It may be a signal. Also, in the first to fourth embodiments, the case where various setting signals are superimposed within one vertical blanking period of the input signal has been described, but they may be superimposed in a time division manner. Further, in the first to fourth embodiments, the case where various setting signals are superimposed in the vertical blanking period of the input signal has been described, but they may be superimposed in other periods as long as there is no effect on the screen. .

In the fifth embodiment, the case where the first electrode is applied to the cathode electrode and the second electrode is applied to the first grid electrode using the CRT has been described, but it is applied to the other electrodes. It may be configured.

[0087]

As described above, according to the first aspect of the invention, the main screen and the sub-screen area on the screen are jumped or sequentially scanned on the basis of the detection signal which automatically detects the sub-screen area on the screen. By controlling the scanning state of, the interlace scanning is performed with the image signal and the sequential scanning is performed with the character signal, display conditions suitable for displaying an image, a character, or a graphic can be realized. The screen can be displayed.

According to the second invention, in the transmitter for generating the signals of the main screen and the sub screen on the screen, by multiplexing the setting signal of the display area and the scanning method during the blanking period of the video signal, Since scanning suitable for each signal specification can be realized on the receiver side, a clear multi-screen display is possible without line flicker.

According to the third aspect of the invention, the image adjustment state such as brightness and contour compensation is controlled in the main screen and sub-screen areas on the screen based on the detection signal which automatically detects the sub-screen area on the screen. Then, by performing contour compensation at high luminance in the image signal and not performing contour compensation at low luminance in the character signal, display conditions suitable for image, character, or graphic display can be realized, and thus line flicker may occur. This makes it possible to display a multi-screen that is inconspicuous and clear.

According to the fourth aspect of the invention, in the transmitter for generating the signals of the main screen and the sub screen on the screen, the setting signals of the display area and the image adjustment state are multiplexed during the blanking period of the video signal. Since image adjustment suitable for each signal specification on the receiver side can be automatically realized, a clear multi-screen display is possible without line flicker. In addition, by standardizing the multiplexing of setting signals, it is not necessary to optimize image adjustment items and detect sub-screen areas for each signal specification on the receiver side. Higher image quality can be realized in the display device.

Further, according to the fifth invention, by controlling the cathode electrode drive and the parallel drive of the cathode and the grid electrode according to the result of the signal discrimination, and controlling the amplitude ratio and the frequency component of the applied signal, the image Gradation at the time of display and wide band at the time of character display can be easily realized, and optimal multi-screen display according to each signal specification and performance can be realized, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram of a television receiver according to a first embodiment of the present invention.

FIG. 2 is a scanning line array diagram for explaining the operation of the embodiment.

FIG. 3 is a detailed block diagram of a detection unit and an auxiliary deflection unit according to the embodiment.

FIG. 4 is an operation waveform diagram for explaining a detection operation of a sub-screen area of the embodiment.

FIG. 5 is an operation waveform diagram for explaining an auxiliary deflection operation of the same embodiment.

FIG. 6 is a scanning line array diagram for explaining the scanning control operation of the embodiment.

FIG. 7 is a detailed block diagram of an auxiliary deflection drive circuit of the same embodiment.

FIG. 8 is a detailed block diagram of a detection unit and an auxiliary deflection unit according to the embodiment.

FIG. 9 is an operation waveform diagram for explaining a setting signal detection operation of the same embodiment.

FIG. 10 is a block diagram of a television transmitter according to a second embodiment of the present invention.

FIG. 11 is a diagram showing a display screen and operation waveforms for explaining the operation of the embodiment.

FIG. 12 is a block diagram of a television receiver according to a third embodiment of the present invention.

FIG. 13 is a screen diagram and an operation waveform diagram for explaining the luminance control method of the same embodiment.

FIG. 14 is an operation waveform diagram for explaining a contour compensation control method according to the embodiment.

FIG. 15 is a detailed block diagram of a detection unit and an image adjustment unit of the embodiment.

FIG. 16 is a screen diagram and an operation waveform diagram for explaining the image adjustment operation of the embodiment.

FIG. 17 is a detailed block diagram of a detection unit and an auxiliary deflection unit of the embodiment.

FIG. 18 is an operation list diagram for explaining a setting signal detection operation of the embodiment.

FIG. 19 is a block diagram of a television transmitter according to a fourth embodiment of the present invention.

FIG. 20 is a block diagram of a television receiver according to a fifth embodiment of the present invention.

FIG. 21 is a relational diagram for explaining the operation of the embodiment.

FIG. 22 is an operation waveform chart for explaining the operation of the embodiment.

FIG. 23 is an operation waveform chart for explaining an amplitude control operation of the same embodiment.

FIG. 24 is a characteristic diagram for explaining the amplitude control operation of the same embodiment.

FIG. 25 is a block diagram for explaining the band control operation of the embodiment.

FIG. 26 is a characteristic diagram for explaining the band control operation of the embodiment.

FIG. 27 is a detailed block diagram for explaining the band control operation of the embodiment.

FIG. 28 is a block diagram of a conventional television receiver.

FIG. 29 is a scanning line array diagram and an operation waveform diagram for explaining a conventional operation.

[Explanation of symbols]

 5 Detection Section 6 Auxiliary Deflection Section 7 Auxiliary Deflection Yoke 11 Main Screen 12 Subscreen 15 Control Signal Generation Circuit 18 Scanning Method Detection Circuit 31 Television Signal Generation Circuit 32 Computer Signal Generation Circuit 33 Synthesis Circuit 36, 51 Serial Signal Generation Circuit 35, 51 Superimposing Circuit 38 Image Adjusting Section 55 Signal Discriminating Section 53, 54 Gain Control Section 56, 57 Video Output Section 58 Cathode Electrode 59 Grid Electrode 61 High Pass Filter 62 Low Pass Filter

Claims (16)

[Claims] 1. A multi-screen display means for displaying a multi-screen input signal having a main screen and a sub-screen, a display area detection means for detecting a display area of the multi-screen display means, and a scanning method for the display screen. A television receiver comprising: scanning method detecting means for detecting; and auxiliary deflecting means for controlling a scanning method of a multi-screen based on detection signals from the display area detecting means and the scanning method detecting means. 2. The television receiver according to claim 1, wherein the display area detecting means detects the display area based on the correlation of the input signals in the level direction. 3. The television receiver according to claim 1, wherein the display area detecting means detects the display area from an outer frame signal provided on a boundary between the main screen and the sub screen. 4. A display area detecting means and a scanning method detecting means,
2. The television receiver according to claim 1, wherein the display area and the scanning method information superimposed on the blanking period of the input signal are detected. 5. An auxiliary deflecting means performs scanning so as to perform interlaced scanning for an image signal having level correlation in an image or the like and sequential scanning for a character or graphic signal having no level correlation in a character or graphic. The television receiver according to claim 1, wherein the system is controlled. 6. A multi-screen signal generating means for generating a plurality of signals, a multi-screen signal generating means for combining a plurality of signals from the signal generating means on the same screen to generate a multi-screen signal, and the multi-screen. A television transmitter comprising a superimposing means for superimposing information on a display area and a scanning method during a blanking period of a signal from the signal generating means. 7. A multi-screen display means for displaying a multi-screen input signal having a main screen and a sub-screen, a display area detection means for detecting a display area of the multi-screen display means, and a display area detection means. A television receiver comprising image adjusting means for controlling image adjustment such as brightness and contour compensation of multiple screens based on a detection signal. 8. The television receiver according to claim 7, wherein the display area detecting means detects the display area based on the correlation of the input signals in the level direction. 9. The television receiver according to claim 7, wherein the display area detecting means detects the display area from an outer frame signal provided at a boundary between the main screen and the sub screen. 10. The television receiver according to claim 7, wherein the display area detecting means detects the display area and image adjustment information superimposed in the blanking period of the input signal. 11. An image adjusting means performs contour compensation with high brightness on an image signal having a correlation in a level direction such as an image,
8. The television receiver according to claim 7, wherein the image adjustment is controlled so that contour compensation is not performed at low luminance for a character or graphic signal such as a character or graphic having no correlation in the level direction. 12. A signal generating means for generating a plurality of signals,
Multi-screen signal generating means for generating a multi-screen signal by combining a plurality of signals from the signal generating means on the same screen, and a display area and image adjustment during a blanking period of the signal from the multi-screen signal generating means. A television transmitter including a superimposing unit that superimposes the information of. 13. Discrimination means for discriminating input signals of a multi-screen input signal having a main screen and a sub-screen, control means for controlling the amplitude and frequency components of the input signal based on the discrimination signals from the discrimination means, A television receiver comprising an applying means for applying a signal from the control means to the cathode and the grid electrode of the cathode ray tube. 14. The cathode ray tube is driven by the control means by applying a video signal to the cathode electrode for the image signal and to the cathode and grid electrodes for the character signal.
The television receiver according to 3. 15. The television receiver according to claim 13, wherein the control means controls the amplitude ratio applied to the cathode and the grid electrode. 16. The control means controls the separation of frequency components so that the low frequency component of the input video signal is applied to the cathode electrode and the high frequency component is applied to the grid electrode. The described television receiver.