JP3291190B2 - A plurality of multi-screen quasi-moving image display devices for a TV receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a plurality of Picture-In-P
The present invention relates to a technology for generating an image / Picture-Out-Picture (hereinafter referred to as PIP / POP) screen.
Three or more quasi-video PIP / PO using one tuner
Provide a P screen or display a screen with more than the number of tuners.
The present invention relates to a plurality of multi-screen quasi-moving image display devices of a TV receiver provided in the form of IP / POP and suitable for selecting a video signal input from the outside in a time-division manner.

[0002]

2. Description of the Related Art In general, a PIP / POP display system for providing one or more sub-screens in addition to one main screen,
As shown in FIG. 9A, one screen is changed to a plurality of screens (A
-L), and as shown in FIG.
A method in which three main screens are included in one main screen, and FIG. 9 (C)
As shown in FIG. 1, a method is roughly divided into a method in which one main screen includes one sub-screen.

As shown in FIG. 10, a conventional quasi-moving picture PIP / POP screen generator includes a microcomputer 12 for outputting a switching control signal (SC1) in response to a channel search signal input via a remote controller 10,
A sub-screen tuner 14 for tuning a high-frequency video signal under the control of the microcomputer 12;
A sub-screen intermediate frequency detector 16 that detects the intermediate frequency signal output from the sub-screen tuner 14, outputs an automatic fine adjustment signal (AFT1) to the microcomputer 12, and outputs a sub-screen video signal; A main screen tuner 18 for tuning a high-frequency video signal under the control of the microcomputer 12, and an intermediate frequency signal output from the main screen tuner 18 are detected, and an automatic fine adjustment signal (AFT 2) is output to the microcomputer 12. A main screen intermediate frequency detector 20 for outputting a main screen video signal, and a plurality of external video signals (AV1 to AVn) input from the outside and a sub-screen output from the sub-screen intermediate frequency detector 16 The video signal and the main screen video signal output from the main screen intermediate frequency A video switching unit 22 that is selected in accordance with the switching control signal (SC1) output from the printer 12, and when a video signal for a sub-screen is output from the video switching unit 22, the video signal for the sub-screen is output. When a horizontal / vertical sync pulse signal generator 24 that outputs a horizontal / vertical sync pulse signal (H / V1) to the microcomputer 12 and a main screen video signal is output from the video switching unit 22, the main screen video is output. A horizontal / vertical synchronizing pulse signal generator 32 for outputting a horizontal / vertical synchronizing pulse signal (H / V2) to the microcomputer 12;
/ Vertical synchronization pulse signal (H / V2) output from
In accordance with the horizontal / vertical synchronization pulse signal (H / V1) output from the horizontal / vertical synchronization pulse signal generator 24, the PIP screen is appropriately reduced by appropriately reducing the sub-screen video signal output from the video switching unit 22. PIP screen generator 28 for generating a video signal for
8 stores a PIP screen video signal generated by the PIP 8 and a PI output from a PIP screen generator 28.
A video signal processing and PIP screen switching unit 30 for switching the P screen video signal and the main screen video signal selected by the video switching unit 22, and a video signal selected by the video signal processing and PIP screen switching unit 30. And a two-dimensional display element 34 for display.

If an automatic gain control voltage is used to stably control the tuning of the sub-screen tuner 14, a low-pass filter 13 can be additionally included as shown in FIG. The operation of the conventional quasi-moving picture PIP / POP screen generator configured as above will be described in detail with reference to the accompanying drawings.

When the user selects a desired channel using the remote controller 10, a channel search signal is input to the microcomputer 12, and the microcomputer 12 outputs the main screen image output to the microcomputer 12 by the image switching unit 22. A switching control signal (SC1) is output so that one video signal is selected from a signal or an external video signal (AV1 to AVn), and an automatic fine adjustment signal (AFT2) fed back and input and horizontal / vertical synchronization Pulse signal (H / V
Based on 2), the accurately compensated tuning voltage is output to the main screen tuner 18. Next, the main screen video signal or the external video signal (AV1 to AVn) selected by the video switching unit 22 is subjected to video signal processing and P
The image is displayed on the main screen shown in FIG. 9B by the two-dimensional display element 34 via the IP screen switching unit 30.

When the user inputs another channel search signal to the microcomputer 12 in such a state that the image is continuously displayed on the main screen as a moving image, the microcomputer 12 transmits the sub-screen image signal. Switching control signal (SC1) so that
And the first high-frequency video signal is transmitted to the sub-screen tuner 1.
The tuning voltage is gradually increased until it is received at 4 and such tuning voltage is compensated in the same manner as the main screen tuner 18.

[0007] The first high-frequency video signal received in this manner is a PIP having a size suitable for being displayed on the sub-screen.
After being reduced by the screen generator 28 and stored in the memory 26, the video signal processing and the PIP screen switching unit 30
9 (B) by the two-dimensional display element 34 through
Is displayed on the screen of the “A” channel shown in FIG.

Next, the microcomputer 12 continuously increases the tuning voltage, and the second high-frequency image signal is received by the sub-screen tuner 14, and the two-dimensional display device shown in FIG.
Is displayed on the screen of the “A” channel shown in FIG.
Next, as the tuning voltage continues to increase, the received third video signal is displayed on the screen of the “C” channel shown in FIG.

As described above, the channel search is performed in the order of “A” channel → “B” channel → “C” channel → “A” channel until all the preset frequency bands are searched. The PIP display method shown in FIG. 9C is a method of receiving and displaying a moving picture image on the main screen and a quasi-moving picture image on the sub-screen using two tuners.

That is, the microcomputer 12 supplies the main screen tuning voltage to the main screen tuner 18, and the intermediate frequency signal generated by the main screen tuner 18 is supplied to the main screen intermediate frequency detector 20 by the main screen intermediate frequency detector 20. The signal is converted into a baseband composite video signal and transmitted to the video switching unit 22. Next, the switching control signal (SC1) output from the microcomputer 12
The video switching unit 22 selects one video from the composite video signal or the plurality of external video signals (AV1 to AVn) converted into the main screen base band, and selects the video signal of the selected video signal. The image is displayed on the main screen shown in FIG. 9C by the two-dimensional display element 34 via the processing and PIP screen switching unit 30.

The sub-screen tuner 14 is controlled by a tuning voltage output from the microcomputer 12.
And a composite video signal of a sub-screen baseband generated through the intermediate frequency detector 16 or a plurality of external video signals (AV
1 to AVn), and the selected video signal is output to the PIP screen generator 28 and the memory 2
6 is converted into a reduced-size video signal, and the converted video signal is processed via the video signal processing and PIP screen switching unit 30 and the two-dimensional display element 34 as shown in FIG.
The image is displayed on the sub-screen shown in FIG.

On the other hand, as shown in FIG. 11, when the automatic gain control voltage is used to stably control the tuning of the sub-screen tuner 14, the sub-screen intermediate frequency detector 16 outputs the automatic gain control voltage ( AGC) is generated, and the generated automatic gain control voltage (AGC) is applied to the sub-screen tuner 14 via the low-pass filter 13.
As shown in FIG. 12, the automatic gain control voltages for tuning the video signals of the “A”, “B”, and “C” channels having different electric field intensities are “VA” and “V”.
B "," VC ", and the overall gain curve C3, the gain curve C1 of the sub-screen tuner 14, and the gain curve C2 of the sub-screen intermediate frequency detector 16 are displayed by electric field strength.

[0013]

However, a general PIP display means uses two tuners and uses three tuners.
The disadvantage is that you cannot provide more than one quasi-video screen at the same time,
If another tuner is added to solve this problem, there is a problem in that the price increases and the user bears an economic burden. When the automatic gain control voltage is used as in the prior art, since the low band is composed of a resistor and a capacitor having a large time constant, as shown in FIG. 8, the automatic gain control voltage output from the low band filter is used. Has a falling time (ft) and a rising time (rt). That is, generally, the resistance value included in the low-pass filter is about 10
KΩ and the capacitance of the capacitor is about 50μ
In the case of F, the time constant is 0.5 seconds, and the falling time (ft) and the rising time (rt) are 0.5 seconds. Therefore, at the time of channel change, it takes at least 0.5 seconds or more for the sub-screen video signal to be stable, causing a phenomenon that the screen flickers, and two or less PIPs per second.
Only the / POP screen can be provided. Consequently, when an automatic gain control voltage is used as in the prior art, a very slow PIP /
Since the POP screen is generated, the PIP / POP screen is stationary
(still) There is no difference from the screen.

Accordingly, it is an object of the present invention to provide three or more quasi-moving picture PIP / POP screens using two tuners, or to provide a quasi-moving picture PIP / P screen with more than the number of tuners.
An object of the present invention is to provide a plurality of multi-screen quasi-moving image display devices of a TV receiver which are provided in the form of an OP and select a video signal input from the outside in a time-division manner.

[0015]

According to the present invention, there is provided a tuning memory for storing tuning data used for tuning a high frequency video signal of each channel, and a channel search input via a remote controller. A microcomputer that controls tuning according to the signal, a main screen tuning unit that tunes a high-frequency video signal of the main screen channel under the control of the microcomputer, and outputs a main screen video signal, and control of the microcomputer. By
A sub-screen tuning unit that sequentially tunes high-frequency video signals of a plurality of main screen channels using the tuning data stored in the tuning memory and outputs a sub-screen video signal; The main screen video signal output from the main screen tuning unit or the externally input video signal, and selects the horizontal / vertical video signal for the main screen and the sub screen video signal. A video switch for detecting a synchronization pulse signal and a horizontal / vertical synchronization pulse signal generation unit; and a video signal selection of the video switch and the horizontal / vertical synchronization pulse signal generation unit, reducing the selected video signal, and tuning control. Signal and quasi-video PIP / POP
Quasi-video PI that outputs video signal and high-speed blanking signal
A P / POP screen generator, a video memory including a buffer video memory and a main video memory for storing the video signal reduced by the quasi-movie PIP / POP screen generator, and a quasi-movie PIP / POP screen generator. And a video signal processing and display unit for displaying the output quasi-moving picture PIP / POP video signal, the video switch and the main screen video signal output from the horizontal / vertical synchronization pulse signal generation unit. I do.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. A plurality of multi-screen quasi-moving image display devices of a TV receiver according to the present invention include:
As shown in FIG. 2, the control unit 70 controls the tuning operation so that the main screen and the sub-screen high-frequency image signals are received using the stored tuning data of each broadcasting station channel. A sub-screen tuning unit 71 for tuning the high-frequency video signal under the control of the unit 70; a main screen tuning unit 72 for tuning the high-frequency video signal under the control of the control unit 70;
A video signal output from the main screen tuning section 72 and the sub screen tuning section 71 or an externally input video signal (AV) is selected, and a main screen horizontal / vertical synchronization pulse signal (H / Vpls1) and a sub screen A video switch and a horizontal / vertical sync pulse signal generator 73 for outputting a screen horizontal / vertical sync pulse signal (H / Vpls2); and the video switch and horizontal / vertical sync pulse signal generator 7
3 and receive the horizontal / vertical synchronization pulse signals (H / Vpls1) and (H / Vpls2), store the reduced digital video data,
/ POP video signal (VS) and high-speed blanking signal (fa
PIP / POP that outputs st blanking signal (FB)
A screen generator 74 and the PIP / POP screen generator 74
Moving image PIP / POP video signal (VS) output from
Alternatively, a video signal processing and display unit that selects a video signal output from the video switch and the horizontal / vertical synchronization pulse signal generation unit 73, processes the selected video signal so as to be suitable for display, and displays the selected video signal. 75.

Here, the control unit 70 includes a remote controller 700 for providing a user interface, and an EEPROM for storing tuning data of each broadcasting station channel.
Tuning memory 701 such as
In response to the channel search signal input via 00,
It comprises a sub-screen tuning unit 71 and a microcomputer 702 which controls the main screen tuning 72 using the tuning data stored in the tuning memory 701.

The sub-screen tuning section 71 is shown in FIG.
As shown in FIG. 7, a sub-screen tuner 703 for tuning a high-frequency video signal under the control of the microcomputer 702 and a sub-screen for detecting an intermediate frequency signal output from the sub-screen tuner 703 and outputting a sub-screen video signal. Screen intermediate frequency detector 704 and an automatic gain control voltage (AGC) output from the sub-screen intermediate frequency detector 704 and input through the low-pass filter 33.
1), and a tuning accelerator 705 for supplying the increased / decreased automatic gain control voltage to the sub-screen tuner 703.

The tuning accelerator 705 includes a comparator 34 for comparing the automatic gain control voltage input via the low-pass filter 33 with the automatic gain control voltage fed back, and a digital converter for converting the automatic gain control voltage fed back. After the conversion, the converted automatic gain control data is increased or decreased in accordance with the output signal of the comparator 34, and the increased or decreased automatic gain control data is stored in the tuning memory 701. It comprises a controller 35 and a digital / analog converter 36 for converting the automatic gain control data output from the controller 35 into an analog automatic gain control voltage.

The main-screen tuning section 72 controls a main-screen tuner 706 to tune a high-frequency video signal under the control of the microcomputer 702, and detects an intermediate frequency signal output from the main-screen tuner 706 to detect a main screen. And a main screen intermediate frequency detector 707 that outputs a video signal for the main screen. The video switch and horizontal / vertical synchronization pulse signal generation unit 73 converts the video signal output from the main screen tuning unit 72 and the sub screen tuning unit 71 or an externally input video signal (AV) into a PIP / POP screen. A video switching unit 708 selected by the control of the generation unit 74, and a horizontal / vertical synchronization pulse signal (H / Vpls) of the main screen from the video signal selected by the video switching unit 708.
1), and a horizontal / vertical synchronization pulse signal generator 709 for outputting (H / Vpls2).

The PIP / POP screen generating section 74 controls the video switching section 708 to reduce a sub-screen video signal input through the video switching section 708 or a video signal (AV) input from outside. , A tuning control signal (Tc) to the microcomputer 702, and a quasi-moving picture PIP / PO that outputs a quasi-moving picture PIP / POP video signal (VS) and a high-speed blanking signal (FB).
The P-screen generator 710 includes a P-picture generator 710 and a video memory 711 that stores a reduced sub-screen video signal under the control of the quasi-moving picture PIP / POP screen generator 710.

The quasi-moving picture PIP / POP screen generator 71
0 receives the horizontal / vertical synchronization pulse signal (H / Vpls1) of the main screen and the horizontal / vertical synchronization pulse signal (H / Vpls2) of the sub-screen and outputs a tuning control signal (Tc) as shown in FIG. The sub-video image signal input via the video switching unit 708 is horizontally and horizontally controlled by the sub-video multi-screen generation controller 806 controlling the video switching unit 708 and the sub-video multi-screen generation controller 806. A write processor 807 for vertically reducing the size and recording the reduced digital video data in the video memory 711
And an input selector 810 for selecting video data output from the video memory 711 under the control of the quasi-moving image multi-screen generation controller 806, and controlling the video data output from the input selector 810 to quasi-moving image multi-screen generation control The video signal for the sub-screen is restored by the control of
POP video signal (VS) and high-speed blanking signal (F
B), and a video signal restoration processor 811 for outputting B).

The video signal processing and display unit 75
Selects a main screen video signal input via the video switch unit 708 or a quasi-moving video PIP / POP video signal (VS) output from the video signal restoration processor 811, and the selected video signal is displayed. A video switch and a video signal processing unit 712 for performing processing suitable for
It comprises a high-speed blanking signal (FB), a two-dimensional display element 713 for displaying the video signal output from the video switch and the video signal processing unit 712.

The operation and effect of the present invention will now be described in detail with reference to the accompanying drawings. First, when a channel search signal is input to the microcomputer 702 via the remote control 700, the main screen tuner 706 outputs a high-frequency image of the "D" channel which is a target broadcast station channel among the input high-frequency image signals. A signal is selected under the control of the microcomputer 702, and the selected high-frequency video signal is converted into an intermediate frequency signal. Next, the main screen intermediate frequency detector 707 detects the input intermediate frequency signal,
The main screen video signal is output to the video switching unit 708 and the automatic gain control voltage (AGC2) is output to the main screen tuner 706. Thus, the main screen video signal is displayed on the main screen as shown in FIG. 1 by the two-dimensional display element 713 through the video switching unit 708, the video switch and the video signal processing unit 712.

On the other hand, in the state where the moving picture video signal of the "D" channel is displayed on the main screen,
The quasi-moving image signal is displayed on the PIP / POP screen of the “A”, “B”, and “C” channels as shown in FIG. That is, each broadcasting station channel (ACH), (B
CH), (CCH) and their broadcasting station channels (AC
H), (BCH) and (CCH) tuning frequencies (TUNE) A), (TUNE B), (TUNE
C) is already stored in the tuning memory 701, and when the user sets the PIP / POP mode using the remote controller 700, as shown in the flowchart of FIG. A), (AGC B), (AGC
C) is initialized by being generated by the tuning accelerator 705 and stored in the tuning memory 701 (S10).

The initialization process will be described in more detail with reference to FIGS. When the microcomputer 702 starts automatic gain control (S1), the microcomputer 702 determines whether the current mode is the acceleration mode (S2). Next, since the initialization is currently being performed, the microcomputer 702 applies the tuning frequency of the corresponding channel stored in the tuning memory 701 to the sub-screen tuner 703, so that the sub-screen intermediate frequency detector 704 is activated. The sub-screen video signal is output to the video switching unit 708 and an automatic gain control voltage (AGC1) is generated. Next, the comparator 34 of the tuning accelerator 705 compares the automatic gain control voltage fed back from the digital / analog converter 36 with the automatic gain control voltage (AGC1) input via the low-pass filter 33 (S13). Next, the controller 35 converts the fed back automatic gain control voltage into digital automatic gain control data, and if the output of the comparator 35 is "+", increases the automatic gain control data (S14). If the output of the comparator 35 is "-", the automatic gain control data is decreased (S
15) The increased or decreased automatic gain control data is output to the digital / analog converter 36 and recorded in the tuning memory 701 (S16). Accordingly, the digital / analog converter 36 converts the input automatic gain control data into an analog automatic gain control voltage (S17), and converts the converted automatic gain control voltage into the sub-screen tuner 703, the comparator 34, To the vessel 35. The above-described process includes automatic gain control data (AGC) for all channels. A), (AGC B), (AGC This is repeated under the control of the microcomputer 702 until C) is initialized.

After the initialization process is completed, as shown in the flowchart of FIG. 5, the tuner 703 for the sub-screen displays the tuning frequency (TUNE) stored in the tuning memory 701. A) and automatic gain control data (AGC)
The high frequency video signal of the “A” channel is tuned using A) (S20). That is, as shown in the flowchart of FIG. 6, when the automatic gain control is started by the microcomputer 702 (S1), the controller 35 of the tuning accelerator 705 controls the automatic gain control data (AGC) stored in the tuning memory 701. A) is read and transmitted to the digital / analog converter 36. Next, the digital / analog converter 36 receives the input automatic gain control data (AGC). A) is converted into an analog automatic gain control voltage (S4), and the converted automatic gain control voltage is applied to the sub-screen tuner 703.
03 selects the high-frequency video signal of the "A" channel.

Next, a sub-screen intermediate frequency detector 704 is provided.
Sub-screen video signal output from
Under the control of the quasi-moving image multi-screen generation controller 806 of the P-screen generation unit 710, the video data is selected by the video switching unit 708 and applied to the writing processor 807. Next, as shown in the flowchart of FIG. 5, the writing processor 807 reduces the input video signal and controls one field or one frame of the reduced digital video data by the control of the quasi-moving image multi-screen generation controller 806. Is stored in the buffer video memory 808 of the video memory 711 (S30). At this time, when the vertical synchronization pulse signal (Vpls1) of the main screen is time-divided for each channel as shown in FIG.
The flag is set to "1" because it is at the high level during the time period of the channel. Here, the flag is used to control the write operation and the read operation of the video memory 711 in a handshake method.

As described above, the quasi-moving image multi-screen generation controller 80
6 judges whether the flag is set to "1" (S
101), it is determined whether or not the video data of the “A” channel is stored in the buffer video memory 808 (S1).
02). Accordingly, the video data output from the buffer video memory 808 is transmitted to the main video memory 809, and the transmitted video data is stored in the “A” of the main video memory 809.
The data in the “A” channel area is updated by being stored in the channel area, and the input selector 810 selects the video data output from the buffered video memory 808 under the control of the quasi-moving picture multi-screen generation controller 806. The selected video data is displayed on the screen of the “A” channel via the video signal restoration processor 811 and the video signal processing and display unit 75 (S103). Here, if the flag is not set to “1” or the video data of the “A” channel is not stored in the buffer video memory 808, the video data stored in the main video memory 809 is input by the input selector 810. After being selected and processed as described above, it is displayed on the screen of the "A" channel (S105).

Next, the flag is reset to "0" (S104), and the quasi-moving image multi-screen generation controller 806 sends a tuner control signal (Tc) to the microcomputer 702.
To tune the high-frequency video signal of the “B” channel to the above method,
The quasi-moving image multi-screen generation controller 806 controls the video switching 708 so that the video signal of the channel is selected (S40). Next, the vertical synchronizing pulse signal (Vpls1) of the main screen becomes high level in the time zone of the "B" channel, and the flag is set to "1" (S50), and new video data is stored in the buffer video memory 808. To indicate that a new read and display operation has begun.

Next, it is determined whether the flag is set to "1" (S60). If the flag is already set to "1" (S201), the video data of the "B" channel is stored in the buffer video memory 808. Since the image data is stored (S202), the image data in the buffer image memory 808 is transmitted to the main image memory 809, processed as described above, and displayed on the screen of the "B" channel (S203). Here, the flag is not set to “1” or “B” is stored in the buffer video memory 808.
If the video data of the channel is not stored, the video data stored in the main video memory 809 is input to the input selector 8.
After being selected by 10 and processed as described above,
Displayed on the screen of the “B” channel (S20
5).

Next, the flag is reset to "0" (S204), and the above steps (S50), (S60), and (S3) are performed as the "C" channel is tuned.
01), (S302), (S303), (S304),
(S305) is sequentially performed. Thus, "A",
As the high-frequency video signals of the “B” and “C” channels are sequentially tuned, the screens of the “A”, “B” and “C” channels become quasi-moving picture PIP / POP screens.

On the other hand, when the video switch unit 708 is controlled to select the external video signal (AV), the external video signal (AV) can be displayed in the form of a quasi-moving picture PIP / POP, and the main screen can be displayed horizontally. Synchronous pulse signal (Hpls
When 1) is used, the quasi-moving image PIP / POP screen can be horizontally arranged as shown in FIG. 9B.

[0034]

As described above, the high-frequency video signal can be tuned at high speed by storing the automatic gain control data corresponding to each channel in the tuning memory at the time of initialization using the tuning accelerator of the present invention. That is, referring to FIG. 8, the waveform of the automatic gain control voltage used in the present invention is similar to the ideal automatic gain control voltage waveform (W2), and the sub-screen channel can be tuned at high speed. When the channel is changed, the flickering phenomenon is eliminated, and a stable quasi-moving picture PIP / POP screen can be generated. Further, the present invention can display PIP / POP screens having more than the number of tuners in a form of high-speed quasi-moving image, and display video signals of a plurality of channels and video signals inputted from the outside by a plurality of PIP / POP screens.
/ POP screen can be displayed in a quasi-moving image form.

[Brief description of the drawings]

FIG. 1 shows a quasi-moving picture PIP / POP screen according to the present invention, wherein (A) is a configuration diagram of a quasi-moving picture PIP / POP screen when a vertical synchronization pulse signal of a main picture is used, (B).
7 is a configuration diagram of a quasi-moving picture PIP / POP screen when a horizontal synchronization pulse signal of a main screen is used.

FIG. 2 is a block diagram of an open-number quasi-moving picture PIP / POP screen generator according to the present invention;

FIG. 3 is a detailed block diagram of a sub-screen tuning unit of FIG. 2;

FIG. 4 is a detailed block diagram of a PIP / POP screen generator of FIG. 2;

FIG. 5 is a flowchart relating to a write operation of a video memory.

FIG. 6 is a flowchart relating to the operation of the tuning accelerator of FIG. 3;

FIG. 7 is a flowchart illustrating a read operation of a video memory, a video signal processing, and an operation of a display unit.

FIG. 8 is an output waveform diagram of the automatic gain control voltage of FIGS. 7 and 11;

FIG. 9 is a view showing an example of a conventional PIP screen, where (A) is a screen configuration diagram in the case of dividing one screen into a plurality of screens, and (B).
FIG. 5 is a screen configuration diagram in a case where three main screens are included in one main screen, and FIG. 4C is a screen configuration diagram in a case where one sub screen is included in one main screen.

FIG. 10 is a block diagram of a conventional quasi-moving image PIP / POP screen generation device.

FIG. 11 is a block diagram for processing a conventional automatic control voltage when an automatic gain control voltage is used.

FIG. 12 is a characteristic curve diagram showing amplification gain for each channel obtained by the automatic gain control voltage of FIG. 11;

[Explanation of symbols]

Reference numeral 70: control unit 71: sub-screen tuning unit 72: main screen tuning unit 73: video switch and horizontal / vertical synchronization pulse signal generation unit 74: PIP / POP screen generation unit 75: video signal processing and display unit 702: micro Computer 703: Tuner for sub-screen 704: Intermediate frequency detector for sub-screen 705: Tuning accelerator 708 ... Video switching unit 709 ... Horizontal / vertical synchronization pulse signal generation unit 710 ... Quasi-video PIP / POP screen generation unit 711 ... Video memory 712 ... Video switch and video signal processing unit 713 ... 2D display element

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-198283 (JP, A) JP-A-5-110966 (JP, A) JP-A-5-14824 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04N 5/44-5/45

Claims (4)

(57) [Claims] 1. A tuning memory comprising at least a tuning memory and a microcomputer, wherein the tuning memory stores tuning frequency data and AGC data of a plurality of channels so that a sub-screen signal can be quickly tuned in an initialization process. A control unit that outputs these data from the tuning memory during multi-screen display, a sub-screen tuner that tunes the sub-screen high-frequency signal under the control of the control unit, and an intermediate output from the sub-screen tuner A sub-screen intermediate frequency detector for demodulating a baseband composite video signal by receiving a frequency supply, AGC data output from the sub-screen intermediate frequency detector, and supplied to the sub-screen tuner side AGC
A comparator for comparing data, AGC data is increased / decreased based on a difference between AGC data output from the comparator, and the increased / decreased AGC data is sent to the sub-screen tuner via a D / A converter. And sub-screen tuning for controlling the control unit to output the stored AGC data via the D / A converter only when a plurality of quasi-video screens are generated. A D / A converter for D / A converting AGC data output from the sub-screen tuning controller and supplying the AGC data to the sub-screen tuner; a video switch and a horizontal / vertical synchronization pulse signal generator The video data of the currently tuned channel is temporarily stored in the video buffer memory from the sub-screen tuner via the When the processing and display unit displays the video data of the currently tuned channel, the video data stored in the video buffer memory is processed by the video processing and display unit to display the video data of the channel other than the currently tuned channel. And a sub-screen generating unit for outputting the video data stored in the main memory to the video processing and display unit side when displaying the video data. Video display device. 2. The multi-screen moving image generation controller includes a multi-screen moving image generation control unit, a write processing unit, a video buffer memory, a main memory, and an input selector. Outputting various control signals based on a horizontal synchronizing signal or a vertical synchronizing signal in order to perform a PIP process on a plurality of sub-screen video signals continuously input in a cyclic format; The video data for the sub-screen, which is sequentially reduced and input in the vertical direction, is stored in the video buffer memory, and the video buffer memory is controlled by the multi-screen video generation controller to control the currently tuned channel. After outputting the sub-screen video data to the input selector side,
The main memory stores a predetermined number of sub-screen image data, and stores the image data as image data of a currently tuned channel output from the image buffer memory. The input selector receives the video data output from the video buffer memory and the video data output from the main memory under the control of the multi-screen video generation controller, and selectively receives the video data. The plurality of multi-screen quasi-moving image display devices of a TV receiver according to claim 1, wherein the display is transmitted to a two-dimensional display element side. 3. The TV receiver according to claim 2, wherein the video buffer memory outputs a predetermined flag to notify that all of the video data in the video buffer memory has been transmitted to the input selector side. Multiple multi-screen semi-video display device. 4. The apparatus of claim 2, wherein the image buffer memory stores the image data in field units.