KR19990005200U - Multi-screen TV automatically switches from double screen to single screen - Google Patents

Abstract

When the TV with the picture in picture function is in the double screen mode, when the video signal displayed on the sub screen ends, the sub screen turns off automatically and the main screen is displayed on the entire screen. Disclosed is a multi-screen television that is automatically switched. When the viewer selects a TV having a PIP function in the double screen mode, the main screen displays a regular broadcast received through the main tuner circuit unit, and the sub screen displays a game machine or video input from an external device through an external input terminal. Allows the video signal to be displayed. The video signal of the external device displayed on the sub screen is applied to the main video signal demodulation unit through the switching unit and the PIP signal processing unit through an external input terminal, and the main video signal demodulation unit is applied to the OSD blanking signal of the double screen applied from the microcomputer. It is displayed on the sub screen displayed by. When the video signal of the external device is not applied to the main video signal demodulator, the microcomputer detects the signal by the read mode function and applies a switching signal for switching the double screen mode to the single screen mode to the main video signal demodulator and the PIP signal processor. . The main video signal demodulation unit displays a main screen on which a main video signal is displayed by a switching signal applied from a microcomputer.

Description

Multi-screen TV automatically switches from double screen to single screen

The present invention relates to a multi-screen television, and more particularly, when a television having a picture in picture function is in a double-screen mode, the sub-screen is automatically turned off when the video signal displayed on the sub-screen ends. The present invention relates to a multi-screen television that automatically switches from a double screen to a single screen so that the screen is displayed on the entire screen.

In general, a television receives a broadcast signal transmitted from each broadcasting station through an antenna to display a broadcast corresponding to a screen. The video of an object photographed by a camera at the broadcasting station is converted into a video signal, and the video signal is a constant high frequency signal. It transmits through a transmit antenna. The high frequency signal transmitted through the transmitting antenna is received through a receiving antenna installed in each home and applied to the television. The high frequency signal received by the television is converted to a predetermined intermediate frequency through a tuner circuit unit, and then amplified into a signal having a constant size in the intermediate frequency amplification unit, and the image signal and audio signal detection unit detects the video signal and the audio signal, respectively. After the step, the video signal is applied to the screen of the receiving tube through the demodulation circuit and displayed, and the audio signal is output through the speaker. In this case, when the user selects a broadcast channel to receive through a television using a channel conversion switch, a program of a corresponding broadcasting station is displayed on the screen.

When the multi-screen function is adopted in the television having the above function, the main screen and a plurality of sub-screens (PIP) are displayed on the screen of the television. A separate video signal processing system is installed for the main screen and the sub screen, respectively. That is, a main tuner circuit portion for receiving a main video signal displayed on the main screen is provided, and a sub tuner circuit portion for receiving sub video signals displayed on the sub screen is provided, and the main tuner circuit portion and the plurality of sub tuner circuit portions are broadcasted. It is connected to one antenna for receiving a high frequency signal which is a video signal and simultaneously receives all high frequency signals. Therefore, in order to display the sub-screens overlapped with a part of the main screen, a tuner circuit part for a separate sub-screen is installed so that the main screen is not output in the PIP area where the sub-screen is displayed, and the sub-screen is outputted. do.

1 is a block diagram schematically showing an operation of a television having a general PIP function.

Referring to FIG. 1, a main tuner circuit unit which selects a high frequency signal corresponding to a channel to be displayed on a main screen from among high frequency signals received through an antenna 24, converts it into an intermediate frequency, and then amplifies and generates a composite video signal. 10; A main video signal processor (12) for controlling the composite video signal applied from the main tuner circuit unit (10) to be displayed on the water pipe (22); A sub-tuner circuit unit 14 for selecting a high-frequency signal corresponding to a channel to be displayed on a sub-screen among the high-frequency signals received through the antenna 24, amplifying it to an intermediate frequency, and generating a composite video signal through a series of processes; A PIP control unit 18 connected to the sub-tuner circuit unit 14 for selecting and generating a composite video signal applied from the sub-tuner circuit unit 14 by a PIP function; A switching unit 16 connected between the main video signal processing unit 12 and the PIP control unit 18 and controlling a transmission path of signals transmitted between the main video signal processing unit 12 and the PIP control unit 18; And a signal applied from an external button unit (not shown) connected to the main tuner circuit unit 10, the sub tuner circuit unit 14, the main video signal processing unit 12, the PIP control unit 18, and the switching unit 16. According to the microcomputer 20 to control each operation.

In the television having the PIP function, the microcomputer 20 recognizes this when the viewer selects a multi screen using the screen selection button of the button while watching a broadcast program using the television having the PIP function. The multi-screen signal is popular, the main video signal processor 12 applies an OSD blanking signal corresponding to the number of multi-screens, and the main video signal applied through the main tuner circuit 10 to the switching unit 16. Is blocked so that only the signal applied from the PIP control unit 18 is applied to the main video signal processing unit 12. The main video signal processor 12 displays an OSD screen on the water pipe 22 by an OSD blanking signal applied from the microcomputer 20, and the switching unit 16 is a multi-screen applied from the PIP controller 18. Since all video signals are applied to the main video signal processor 12, the main video signal processor 12 blocks the main video signal applied from the main tuner circuit 10 and displays the video signal from the PIP controller 18 on the OSD screen. Display on. Therefore, the full screen (CRT) 22 displays the multi-screen selected by the viewer.

By selecting a double screen mode consisting of one main screen and one sub screen on a screen of a multi-screen television having the above functions, an arbitrary broadcast is displayed on the main screen, and an external input is input through an external input terminal on the sub screen. The video signal of the video device is displayed to be viewed. When watching the broadcast of the main screen and the video of the sub-screen at the same time, if the video of the video displayed on the sub-screen is terminated and the video signal is not displayed, the sub-screen is displayed with abnormal video signal and loud noise is output. It is inconvenient to take measures such as switching channels.

The present invention was devised to solve the above problems, and an object of the present invention is to automatically turn off the sub-screen when the video signal displayed on the sub-screen is terminated when the multi-screen television is in the double-screen mode. The present invention provides a multi-screen television that automatically switches from a double screen to a single screen to be displayed on the entire screen.

1 is a block diagram schematically showing an operation of a television having a general PIP function.

2 is a block diagram schematically illustrating a multi-screen television that automatically switches from a double screen to a single screen according to the present invention.

Explanation of symbols on the main parts of the drawing

50: main tuner circuit 52: sub-tuner circuit

54: switching unit 56: main video signal demodulation unit

58: PIP signal processing unit 60: microcomputer

62: external input terminal 64: external device

66: antenna 68: water pipe drive

70: screen

In order to achieve the above object, the present invention includes a main tuner circuit unit for converting and amplifying a video signal of a selected channel to an intermediate frequency which is easy to amplify for display on a main screen among high frequency signals received through an antenna; A main video signal demodulator for detecting and demodulating a video signal from an intermediate frequency applied from the main tuner circuit and outputting the video signal to a water pipe drive; A sub-tuner circuit unit for selecting a high-frequency signal received through an antenna, converting and amplifying the intermediate frequency into an intermediate frequency, and detecting an image signal from the intermediate frequency so that the image signal is displayed on a sub-screen displayed on the screen of the receiving tube; A switching unit connected to the main tuner circuit unit and an external device, for switching the image signals applied from the main tuner circuit unit and the external device and applying the main image signal demodulation unit and the PIP signal processing unit; A PIP signal processing unit connected to the sub-tuner circuit unit and the switching unit and applying a video signal applied from the sub-tuner circuit unit and the switching unit to the main video signal demodulation unit through the switching unit; The controller is connected to the switching unit, the PIP signal processor, and the main video signal demodulator. When the video signal of the sub screen is not detected from the main video signal demodulator in the double screen mode, a mode switching signal is applied to the switching unit and the PIP signal processor. The present invention provides a multi-screen television that automatically switches from a double screen consisting of a microcomputer to a single screen so that only the main video signal is displayed on the screen of the receiving hall.

According to the present invention, a viewer selects a television having a PIP function in a double screen mode and displays a regular broadcast received through the main tuner circuit on the main screen, and the sub screen is applied from an external device through an external input terminal. The video signal of the game machine or video to be displayed. The video signal of the external device displayed on the sub screen is applied to the main video signal demodulation unit through the switching unit and the PIP signal processing unit through an external input terminal, and the main video signal demodulation unit is applied to the OSD blanking signal of the double screen applied from the microcomputer. It is displayed on the sub screen displayed by. When the video signal of the external device is not applied to the main video signal demodulator, the microcomputer detects the signal by the read mode function and applies a switching signal for switching the double screen mode to the single screen mode to the main video signal demodulator and the PIP signal processor. . The main video signal demodulation unit displays a main screen on which a main video signal is displayed by a switching signal applied from a microcomputer.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

2 is a block diagram schematically illustrating a multi-screen television that automatically switches from a double screen to a single screen according to the present invention.

Referring to FIG. 2, a multi-screen television that automatically switches from a double screen to a single screen is described. The high frequency signal received through the antenna 66 is converted and amplified into an intermediate frequency by the main tuner circuit unit 50 and displayed on the main screen. Done. The intermediate frequency amplified by the main tuner circuit unit 50 is detected and demodulated by the main image signal demodulator 56 and then applied to the water pipe drive 68 and displayed on the screen (CRT) 70. In addition, the high-frequency signal received through the antenna 66 is applied to the sub-tuner circuit unit 52, the sub-tuner circuit unit 52 converts and amplifies the high-frequency signal to an intermediate frequency and then detects an image signal from the intermediate frequency. The video signal is displayed on the sub screen displayed on the screen 70. A switching unit 54 is connected to the main tuner circuit unit 50 and the external device 64, and the switching unit 54 is connected to the external device 64 through the main tuner circuit unit 50 and the external input terminal 62. The video signal applied from the switch is applied to the main video signal demodulator 56 and the PIP signal processor 58. The PIP signal processor 58 is connected to the sub-tuner circuit 52 and the switch 54, and the PIP signal processor 58 receives an image signal applied from the sub-tuner circuit 52 and the switch 54. The signal is applied to the main video signal demodulator 56 through the switching unit 54 again.

The microcomputer 60 is connected to the switching unit 54, the PIP signal processing unit 58, and the main video signal demodulation unit 56, and the microcomputer 60 is connected from the main video signal demodulation unit 56 in a double screen mode. If the video signal of the sub screen is not detected, the mode switching signal is applied to the switching unit 54 and the PIP signal processing unit 58 so that only the main video signal is displayed on the screen 70.

The present invention made as described above allows the viewer to select the multi-screen television in the double screen mode so that the main screen and the sub screen are displayed on the screen. The main screen is received through the antenna 66 so that the broadcast selected by the main tuner circuit unit 50 is displayed, and the sub screen is an external device input from a video or game machine, which is an external device, through an external input terminal 62. Allows the video signal to be displayed. The external device video signal displayed on the sub screen is applied to the PIP signal processing unit 58 through the switching unit 54, and the PIP signal processing unit 58 is again supplied through the switching unit 54 to the main video signal demodulation unit 56. Is applied. A microcomputer 60 is connected to the main video signal demodulator 56, and the microcomputer 60 detects the magnitude of a video signal applied to the main video signal demodulator 56 by a read mode function, thereby displaying a main screen and a sub screen. It is determined whether the video signal is displayed normally.

The microcomputer 60 detects the video signal from the main video signal demodulator 56 by the read mode function, and if the external device video signal is not detected, the video signal is input to the main video signal demodulator 56 from the external device 64. Therefore, a switching signal for switching to one screen is applied to the PIP signal processing unit 58 and the main video signal demodulation unit 56. That is, in the double screen mode, the microcomputer 60 applies a double screen data value for displaying the double screen to the PIP signal processor 58 and the main video signal demodulator 56 so that the double screen is displayed on the screen. When the external device video signal displayed on the sub screen is not input in the double screen mode, the microcomputer 60 is connected to the PIP signal processor 58 and the main video signal demodulator 56 to switch from the double screen mode to the single screen mode. One screen is displayed on the screen by applying one screen data value to display one screen. Accordingly, the main video signal displayed on the main screen is continuously displayed on the screen of the television while switching from the double screen mode to the single screen mode.

As can be seen from the above description, the present invention allows a viewer to select a television having a PIP function in a double screen mode so that a regular broadcast received through the main tuner circuit is displayed on the main screen, and an external input is displayed on the sub screen. The video signal of a game machine or video applied from an external device is displayed through the terminal. The video signal of the external device displayed on the sub screen is applied to the main video signal demodulation unit through the switching unit and the PIP signal processing unit through an external input terminal, and the main video signal demodulation unit is applied to the OSD blanking signal of the double screen applied from the microcomputer. It is displayed on the sub screen displayed by. When the video signal of the external device is not applied to the main video signal demodulator, the microcomputer detects the signal by the read mode function and applies a switching signal for switching the double screen mode to the single screen mode to the main video signal demodulator and the PIP signal processor. . The main video signal demodulation unit displays a main screen on which a main video signal is displayed by a switching signal applied from a microcomputer.

Claims (2)

A main tuner circuit unit 50 for converting and amplifying a video signal of a selected channel into an intermediate frequency which is easily amplified for display on a main screen among high frequency signals received through the antenna 66; A main video signal demodulator 56 which detects and demodulates a video signal from an intermediate frequency applied from the main tuner circuit unit 50 and outputs a video signal to the water pipe drive 68; The sub-tuner circuit unit 52 selects a high frequency signal received through the antenna 66, converts and amplifies it to an intermediate frequency, detects an image signal from the intermediate frequency, and displays the image signal on the sub-screen shown on the screen 70. ; It is connected to the main tuner circuit unit 50 and the external device 64, by switching the video signal applied from the main tuner circuit unit 50 and the external device 64, the main video signal demodulator 56 and the PIP signal processor ( A switching unit 54 applied to 58; The main video signal demodulation unit is connected to the sub-tuner circuit unit 52 and the switching unit 54, and mixes the image signals applied from the sub-tuner circuit unit 52 and the switching unit 54, and then switches the main image signal demodulation unit through the switching unit 54. A PIP signal processor 58 applied to 56; And It is connected to the switching unit 54, the PIP signal processing unit 58 and the main image signal demodulation unit 56, and if the video signal of the sub screen is not detected from the main image signal demodulation unit 56 in the double screen mode, the switching unit A multi-screen television which automatically switches from a double screen consisting of a microcomputer 60 for applying a mode switching signal to the 54 and PIP signal processing unit 58 so that only the main video signal is displayed on the screen 70. The display apparatus of claim 1, wherein the main video signal demodulator 56 does not apply an OSD blanking signal to the water pipe drive 68 to switch from the double screen mode to the one screen mode when the mode switching signal is applied from the microcomputer 60. A multi-screen television that automatically switches to one screen in the double screen mode.