KR19990042500A - Sub-screen playback control method for external input of multi-screen TV - Google Patents

Abstract

According to the present invention, when a signal input for an external video signal from a predetermined external video player is detected on a multi-screen television equipped with a plurality of external input terminals, the PIP playback mode is automatically executed to reproduce an external video signal through a sub-screen. In addition, the present invention provides a sub-screen playback control method for an external input of a multi-screen television that enables OSD display of a signal input state from a corresponding external input end.

To this end, the present invention simultaneously reproduces a video signal of a plurality of broadcast channels simultaneously tuned by a plurality of tuners (2, 4) as a main / sub picture in a PIP playback mode, and a plurality of external input terminals (10, 12). In the main / sub picture reproduction method of a multi-screen television which receives an external video signal from an external video player connected to a signal and simultaneously plays back as a main / sub picture, A first step of detecting whether an external video signal is input from an external video playback device through the external input terminals 10 and 12 in a state of simultaneously playing back images of a plurality of broadcast channels according to the PIP playback mode; If a state in which an external video signal is input through a predetermined external input terminal is detected among the external input terminals 10 and 12, the mode is switched to PIP playback mode to receive an external video signal from the external input terminal. A second step of generating and displaying OSD display information indicating an external video player which plays on the sub-screen area 40 and provides a corresponding external video signal by performing image signal processing, and plays back to the main screen. According to the switching, a third step of canceling the playback state in the sub-screen area 40 and reproducing the corresponding external video signal on the main screen is featured.

Description

Sub-screen playback control method for external input of multi-screen TV

The present invention relates to a sub picture playback control method for external input of a multi-screen television. More specifically, the main picture and the sub picture can be simultaneously reproduced by a PIP (Picture In Picture) playback mode. When a multi-screen television detects an external signal input from an external video playback device through a wired connection terminal, it automatically executes the PIP playback mode so that the external video signal from the external video playback device can be played through the sub-screen. A sub-screen playback control method for external input of a multi-screen television.

In order to solve the problems caused by the conventional single-screen reproduction method, a TV which is generally used has a single tuner and reproduces a single image on a CRT screen by selecting a single broadcast channel. It is equipped with a tuner to simultaneously tune a plurality of broadcast channels, the entire screen area of the CRT screen as the main screen, and to form a sub-screen in a predetermined screen area of the main screen image of the broadcast channel different from the broadcast channel according to the main screen A PIP regeneration function for reproducing a signal has been developed and commercialized.

In a television equipped with such a PIP playback function, a signal processing synchronous to a synchronization signal separated from a video signal to be reproduced on a main screen is performed on a video signal of a sub picture reproduction target to synchronize with a video scanning period of a video signal according to a main screen. In order to properly scan the screen area of the sub-screen, and to compress and reproduce the entire video area in response to the limited screen size of the sub-screen for the video signal to be reproduced, To convert the image pixel to an appropriate aspect ratio.

In addition, the voice signal corresponding to the video of the main screen and the audio signal corresponding to the video of the sub-screen are output through the speaker and the wired headphone (or wireless headphones) for the voice signals of the multiple broadcast channels simultaneously reproduced according to the PIP playback function. It is possible to play separately and separately, unlike the simultaneous playback state of main / sub picture through CRT screen.

On the other hand, in a television with a PIP playback function, an external video player such as a video tape recorder or a video disc player and a video / audio input terminal are connected to each other in accordance with the execution of AV (Audio-Visual) mode by the user. Through the screen (or sub-screen), it is possible to reproduce the video of television broadcasting and to simultaneously reproduce the external video signal provided from a predetermined external video reproducing apparatus on the sub-screen (or main screen).

However, in a television having a PIP playback function, PIP playback of an external video signal according to a playback operation of a separate external video playback device is performed in a state in which a television broadcast signal of a predetermined broadcast channel is played back according to a single screen playback function or a PIP playback function. In order to play through the function, the user has to operate the remote control remote control or the key panel installed on the front of the television, and select the external mode of the external video player and the mode operation to the AV mode. .

Accordingly, the present invention has been made in view of the above circumstances, and when a multi-screen television equipped with a plurality of external input terminals detects whether a signal input for an external video signal from a predetermined external video player is detected, the PIP playback mode is automatically set. The present invention provides a method for controlling sub-screen playback during external input of a multi-screen television that enables the external video signal to be reproduced through the sub-screen and enables the OSD to be displayed in a perceptual way. There is a purpose.

According to the sub-screen playback control method for external input of a multi-screen television according to the present invention in order to achieve the above object, the video signal of a plurality of broadcast channels that are simultaneously tuned by a plurality of tuners in the main / sub-screen by the PIP playback mode In the main / sub picture reproducing method of a multi-screen television which simultaneously plays back and simultaneously receives external video signals from a plurality of external input terminals and signal-connected external video reproducing apparatuses and plays them simultaneously as a main / sub picture. A first method of detecting whether an external video signal is input from an external video playback device through an external input terminal while simultaneously playing back a video of a single broadcast channel in a playback mode or simultaneously playing videos of a plurality of broadcast channels in a PIP playback mode. And detecting a state in which an external video signal is input through a predetermined external input terminal among the plurality of external input terminals. By switching the live mode and generating an external video signal from the external input terminal and playing the video signal on the sub-screen area, it generates OSD display information instructing the external video player which provides the external video signal. The second step of displaying the screen and the third step of canceling the playback state in the sub-screen area according to the switching of the playback to the main screen and reproducing the corresponding external video signal on the main screen. Provides a screen playback control method.

According to the present invention configured as described above, when a state in which the external video signal provided by the corresponding external video playback device is supplied from the plurality of external input terminals in the multi-screen television is detected, the PIP playback mode is changed. Automatic mode switching is performed so that the corresponding external video signal is reproduced through the sub picture.

1 is a block diagram showing the configuration of a multi-screen television to which the sub-screen playback control method is applied during external input according to the present invention;

2 is a view showing a state in which a sub-screen according to the PIP playback function is automatically played when detecting an external signal input from an external video playback device according to a preferred embodiment of the present invention;

3 is a flowchart illustrating operation in accordance with a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2, 4: tuner, 6, 8: video IF section,

10, 12: external input terminal, 14, 16: external input terminal,

18: multi-screen mode switching unit, 20: signal switching switch unit,

22,24: image processing unit, 26: multi-screen synthesis unit,

28: video output unit, 30, 32: signal detection unit,

34: function setting section, 36: control section,

38: OSD signal processing unit.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a multi-screen television to which the sub-screen playback control method is applied during external input according to the present invention. In the drawings, reference numerals 2 and 4 denote multi-screens from the control unit 36 to be described later. A first and a second receiving the plurality of channel tuning data according to the reproduction mode and simultaneously tuning the corresponding broadcasting channel, and mixing with the local oscillation frequency signal generated by the respective channel tuning data and outputting them as intermediate frequency signals. 2 shows a tuner, and 6 and 8 show the first and second video IF portions which perform intermediate frequency amplification processing of the television broadcast signal tuned through the first and second tuners 2 and 4, respectively.

Also, reference numerals 10 and 12 are wired to an image output terminal of an external video player such as a video tape recorder or a video disc player, and externally read from an image recording medium such as a video tape or a video disc in the external video player. A first and a second external input terminal for introducing a video signal, 14, 16 are the first pre-amplification processing of the external video signal received through the first and second external input terminal (10, 12), respectively And a second external input unit.

Further, reference numeral 18 denotes two screens for television broadcast signals of multiple broadcast channels through the first and second video IF units 6 and 8 in accordance with a multi-screen playback mode by switching control of the control unit 36 described later. In order to provide a switching path for selectively controlling the main / sub picture reproduction state on the image, a multi-screen mode switching unit for switching the switching state according to the AV mode of the signal switching switch unit 20 to be described later is shown. Multiple broadcasting from the first and second video IF units 6 and 8 by switching switching under the multi-screen playback mode by the mode switching unit 18 and switching control according to the AV mode from the control unit 36 described later. And a signal switching switch section for switching the signal paths of the video signals according to the television broadcasting of the channel and the external video signals from the first and second external input units 14 and 16.

Further, reference numeral 22 amplifies the video signal according to the main screen of the two screens through the signal switching switch unit 20 up to an amplification level capable of processing the video signal, and multiplies the signal amplified video signal. A first image processing unit which separates into a luminance signal and a color signal and performs data compression by digital method through luminance adjustment and color demodulation so as to reproduce the entire image on the main screen can be reproduced.

Further, reference numeral 24 denotes a signal amplification process in which the video signal according to the sub-screen of the two screens through the signal switching switch unit 20 is multistage up to an amplification level capable of processing the video signal, and the signal amplification processing is performed in the multistage. After the image signal according to the screen is separated into the luminance signal and the color signal and subjected to luminance adjustment and color demodulation processing, the luminance signal and the color signal are separated from the image signal according to the main screen image-processed by the first image processor 22. A second image processing unit which performs digital signal processing so as to be synchronized with the synchronization signal and performs the same data compression as the image of the main screen.

In addition, reference numeral 26 performs image synthesis for reproducing the image signal according to the main screen and the sub-screen through the first and second image processing units 22 and 24 on the two screens in the correct screen area. A multi-screen synthesizer which performs a signal synthesizing process for displaying the OSD display information signal from the OSD signal processor 38 to be described later, 28 is amplified and driven by the video signal through the multi-screen synthesizer 26 and the CRT. An image output unit which outputs to form two screens on the screen is shown.

Further, reference numerals 30 and 32 perform signal detection operations for determining whether or not an external video signal from an external video player device through the first and second external input units 14 and 16 is input, and detecting the same. The first and second signal detection sections generate the results as the first and second detection signals DS1 and DS2, respectively.

Further, reference numeral 34 is composed of a matrix button unit installed in a predetermined portion of the remote control remote control unit or the control panel of the main body, and selectable key input of the multi-screen playback mode for the formation of two screens or the single screen playback mode for the playback of a single screen And a function setting unit having a plurality of function keys so as to be compatible with the function key input state of the external video player so as to key in the playback and playback stop operations of the external video player.

Also, reference numeral 36 is a control unit that performs execution control on the overall function operation assigned to the multi-screen television by key input of the function setting unit 34, and the control unit 36 is the first signal detection unit 30. Or the second screen detection unit 32, when the first detection signal DS1 or the second detection signal DS2 that detects the input of the external video signal from the external video reproducing apparatus is received, Mode switching is performed according to the multi-screen playback mode and signal switching switch 20 is switched to the AV mode so that an external video signal from a corresponding external input unit is supplied to the second image processing unit 24 to provide an image. OSD processing for displaying as a sub picture on the sub picture area 40 (refer to FIG. 2) after processing and displaying a signal input state for an external picture signal from the corresponding external picture reproducing apparatus. And controls so that the occurrence.

Also, reference numeral 38 denotes an OSD for recognizing an external video reproducing device of an external video signal detected by the first signal detector 30 or the second signal detector 32 under display control of the controller 36. As the OSD signal processing unit for generating display information, the OSD signal processing unit 38 may receive an external image signal through, for example, the first external input terminal 10 and the first external input unit 14 as shown in FIG. 2. When the state is detected by the first signal detection unit 30, the OSD display string 42 such as "first external input detection" is displayed on the screen.

Next, the operation of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 3.

First, in step 45, by switching the broadcast channel under the single screen playback mode by the function setting unit 34, the first tuner 2 selects the channel switched broadcast channel, and the first video IF unit 6 The video signal of the corresponding broadcast channel subjected to the intermediate frequency amplification is image-processed by the first image processor 22 and reproduced as a single screen on the CRT screen through amplification driving by the image output unit 28.

In that state, the controller 36 proceeds to step 46 whereby the first signal detector 30 or the second signal detector 32 is connected to the first and second external input terminals 10 and 12 and the first and second, respectively. The external input unit 14 or 16 determines whether the input state of the external video signal from the external video player is detected.

As a result of the determination in step 46, it is determined that, for example, the input state of the external video signal from the external video reproducing apparatus is detected in the first signal detector 30 and the second signal detector 32, for example. If the control proceeds to step 47, the control of the multi-screen mode switching unit 18 is performed to switch the mode to the multi-screen playback mode, whereby the signal switching of the external video signal by the AV mode of the signal switching switch unit 20 is performed. It is possible to form a furnace.

Accordingly, the external image signal from the first external input terminal 10 and the first external input unit 14 supplied to the external image reproducing apparatus in step 48 passes through the signal switching switch unit 20 to the second image processing unit ( 24 is applied to the image processing, and then the image is synthesized as a sub-screen through the multi-screen synthesizing section 26 and reproduced in the sub-screen area 40 formed on the main screen of the CRT screen. 38), the OSD display string 42 such as " first external input detection " is displayed on the screen at the same time (see FIG. 2).

In that state, the flow advances to step 49 and the control section 36 determines whether the function setting section 34 is performing key input for reproducing the external video signal from the external video playback device reproduced on the sub-screen as the main screen. Determine whether or not.

As a result of the determination in step 49, if it is determined that the function setting unit 34 is performing key input for reproducing the external video signal reproduced on the sub-screen through the main screen, the control proceeds to step 50 and the multi-screen mode. By controlling the switching unit 18, the playback state of the external video signal through the sub-screen area 40 is canceled, and the external video signal is applied to the first image processing unit 22 to be processed and reproduced on the main screen. Be sure to

Subsequently, the control unit 36 proceeds to step 51 in which the first signal detector 30 or the second signal detector 32 does not perform signal detection on the external video signal provided from the external video playback device. Judge whether

As a result of the determination in step 51, if it is determined that the first and second signal detection units 30 and 32 are not detecting the external video signal, the control proceeds to step 52 to completely release the multi-screen playback mode, and The broadcast channel, which has been played back in the second channel, is tuned through the first tuner 2 so as to be reproduced as a single screen through the CRT screen.

According to the present invention made as described above, if the multi-screen television capable of inputting an external signal from a plurality of external video playback devices detects whether an external signal is supplied from the external video playback device, the multi-screen playback mode is activated. As the external signal can be reproduced through the sub-screen by automatically executing, an additional repetitive function manipulation for reproducing the external signal provided from the external video player is unnecessary, thereby providing convenience to the user. .

Claims (1)

Simultaneously reproduces video signals of multiple broadcast channels simultaneously tuned by a plurality of tuners 2 and 4 as main / sub picture in PIP playback mode, and externally connected to a plurality of external input terminals 10 and 12. A main / sub picture reproducing method of a multi-screen television which receives an external video signal from a video reproducing device and simultaneously plays back as a main / sub picture, External video signal from an external video playback device via external input terminals 10 and 12 in the state of simultaneously playing back a video of a single broadcast channel in a single screen playback mode or a plurality of broadcast channels according to a PIP playback mode. A first step of detecting input; If a state in which an external video signal is input through a predetermined external input terminal among the plurality of external input terminals 10 and 12 is detected, mode switching of the PIP playback mode is performed to process external video signals from the external input terminal. A second step of generating and displaying on-screen display information indicating an external video reproducing device which plays on the sub-screen area 40 and provides a corresponding external video signal; A sub-screen during external input of a multi-screen television, comprising the third step of canceling the playback state in the sub-screen area 40 and reproducing the corresponding external video signal on the main screen in accordance with the switching to the main screen. Regeneration control method.