KR960012011B1 - On-screen switching circuit of pip tv sub-screen - Google Patents

Abstract

an input signal discriminating means 20 for discriminating and receiving predetermined data outputted from a remocon; a system controller 30 for outputting blanking data about total system blockings and the sub-screen(PIP), and the blanking data about an "on screen" by supplying received data from the input signal-discriminating means 20; an input signal-mixing means 40 for mixing the blanking data about the sub-screen outputted from the system controller 30 and the blanking data about the "on screen"; a video signal-switching means 50 for outputting and switching main screen data included the "on screen" outputted from a main screen video signal output means 7 by an operation according to data outputted from the input signal-mixing means 40; and a driving means 60 for displaying data outputted from the video signal-switching means 50 in TV.

Description

TV's sub-screen on-screen switching circuit

1 is a block diagram of a television receiver produced by the prior art;

2 shows a sub-screen on-screen switching circuit of a television according to the present invention;

3 is a waveform diagram according to the embodiment of FIG.

* Explanation of symbols for main parts of the drawings

20: input signal discrimination means 30: system controller

40: input signal synthesizing means 50: image signal switching means

60: drive means CRT: receiver

SP: Speaker

The present invention relates to a sub-screen on-screen switching circuit of a television, and more particularly to an on-screen switching circuit for displaying on-screen on a sub-screen using on-screen blanking while the sub-screen is displayed. .

The television produced by the prior art is constructed as shown in FIG. 1, which comprises a first intermediate frequency circuit section for processing video and audio signals received at the antenna 1 and picked up via the main channel tuner 2. (3), the main screen audio signal processing section 4 for processing the demodulated audio signal by the first intermediate frequency circuit section 3, and the audio signal output from the main screen audio signal processing section 4 amplified. And a main signal image processing unit 6 for processing the video signal output from the first intermediate frequency circuit unit 3, and then outputting the audio signal to the speaker SP. The video signal processor 6 outputs RGB data corresponding to the main screen, and the sub-channel tuner 8 picked up by the antenna 1 when the PIP mode is switched. A second intermediate processing the video signal of the sub-channel broadcast picked up through; In the sub-screen video signal processor 10 for processing only the video signal of the sub-channel broadcast output from the wave circuit unit 9, the second intermediate frequency circuit section 9, and the sub-screen video signal processor 10, Main screen RGB output from the sub-screen video signal output unit 11 for outputting RGB data corresponding to the sub-screen, and the main screen video signal output unit 7 and the sub-screen video signal output unit 11, respectively. The first RGB switching IC 12 which synthesizes the data and the sub-screen RGB data by the sub-screen blanking data, and the RGB data including the sub-screen output from the first RGB switching IC 12 and the on-screen. A second RGB switching IC 13 which synthesizes RGB data by on-screen blanking data and outputs RGB data of a sub-screen and on-screen to a receiver is included.

In order to implement the operation of the on-screen display (OSD) together with the sub-screen included in the main screen in the television receiver configured as described above, the sub-screen is formed using the first RGB switching IC 12 and the second RGB switching IC 13. Blanking data for the screen and blanking data for the on-screen had to be used.

This increased the complexity and cost of the circuit configuration by using two switching ICs.

Accordingly, the present invention has been made to solve the above disadvantages, and an object of the present invention is to display on-screen using on-screen blanking data while the sub-screen is displayed.

According to the present invention, the tuner, the first and second intermediate frequency circuits, the video signal processor and output unit on the main screen, the video signal processor and output unit on the sub-screen, and the first and second RGB switching ICs are used. A television receiver having a sub-screen function, comprising: an input signal discrimination means for receiving and discriminating predetermined data output from a remote control, and the like; A system controller for outputting blanking data for the screen and blanking data for the on-screen, an input signal synthesizing means for synthesizing the blanking data for the sub-screen output from the system controller and the blanking data for the on-screen, and It is operated by the data output from the input signal synthesizing means and output from the main screen video signal output unit 7 The image signal switching means for switching and outputting the main screen data including the on-screen and the sub-screen data output from the sub-screen image signal output unit 11, and the data that is switched and output from the image signal switching means Characterized in that consisting of the drive means for displaying on the receiver.

Hereinafter, the present invention will be described in detail with reference to the illustrated drawings.

2 is a diagram illustrating a sub-screen on-screen switching circuit of a television receiver according to the present invention.

As shown in the figure, a television receiver having a sub picture function has a tuner (2) (8), first and second intermediate frequency circuit parts (3) (9), an image signal processing part (6) and an output part of the main picture ( 7), the video signal processing unit 10 and the output unit 11 of the sub-screen, and an RGB switching IC or the like.

The input signal discrimination means 20 is configured to receive predetermined data output from a remote controller or the like, and then determine the received data, and then supply it to the input port 11 of the system controller 30 to be described later.

The system controller 30 receives the data received from the input signal discrimination means 20 to control the overall operation of the system or to output blanking data for the sub-screen and blanking data for the on-screen. It is configured to output through (D2).

The input signal synthesizing means 40 comprises blanking data (Fig. 3 (a)) for the sub-screen output from the output ports D1 and D2 of the system controller 30 and blanking data for the on-screen. 3 (b)) is configured to supply data as shown in FIG. 3 (c) to the port C of the image signal switching means 50, which will be described later, wherein the input signal synthesizing means 40 is a resistor. R1 and switching element TR1.

The image signal switching means 50 receives the data output from the input signal synthesizing means 40 and the main screen data and the sub-screen video signal including the on-screen output from the main screen video signal output unit 7. It is configured to switch the sub-screen data output from the output unit 11 to supply to the receiver driving means 60 to be described later.

The driving means 60 is configured to display the data switched and output by the image signal switching means 50 on the receiver CRT.

As shown in FIG. 2, the present invention comprises a tuner, first and second intermediate frequency circuit means 3 and 9, video signal processing means 6 on the main screen, and video signal output means 7 on the main screen, In a sub-screen on-screen switching circuit of a television composed of the video signal processing means 10 of the sub-screen and the video signal output means 11 of the sub-screen, etc., the predetermined data output from a remote controller or the like is received and determined. The system controller 30 which receives the input signal discrimination means 20 and the data received from the input signal discrimination means 20 and outputs blanking data for the overall control and sub-screen of the system and blanking data for the on-screen. An input signal synthesizing means 40 for synthesizing the blanking data for the sub-screen output from the system controller 30 and the blanking data for the on-screen, and the data output from the input signal synthesizing means 40. Image signal switching for switching the main screen data including the on-screen output from the main screen video signal output means 7 and the sub-screen data output from the sub screen video signal output means 11 and outputting the same. Means 50, and drive means 60 for displaying the data switched and output by the image signal switching means 50 on the receiver.

Referring to the operation of the present invention having the configuration as described above as follows.

In FIG. 2, predetermined data output from a remote controller or the like is supplied to the input signal discrimination means 20 while the power output from the standby power supply unit (not shown) is supplied to the power supply terminal Vcc of the system controller 30. To be supplied.

The data received from the input signal discrimination means 20 is received by the system controller 30, thereby reading data stored in the first memory 16 and performing overall operation of the system.

For example, a pulse waveform as shown in FIG. 3 (a) is output from the output port D1 of the system controller 30, and a waveform as shown in FIG. 3 (b) is output from the output port D2 of the system controller 30. Is output.

Subsequently, the switching element TR1 of the input signal synthesizing means 40 is turned on during the high level among the pulse waveforms as shown in FIG. 3 (b), so that the waveform of FIG. The waveform as shown in (c) is supplied to the port C of the image signal switching means 50.

At this time, the image processed by switching the main screen data RGB including the on-screen input to the image signal switching means 5 and the sub-screen data RGB output from the sub-screen video signal output unit 11 are processed. After being supplied to the receiver driving means 50, it is displayed on the receiver CRT.

The present invention is not limited to the above embodiments and can be modified without departing from the technical gist of the present invention.

As mentioned above, the present invention provides an advantage of displaying a normal on-screen on a sub-screen even when only one IC is used instead of two switching ICs, thereby simplifying the complicated circuit configuration of the product. It is an effective invention that eliminates the rising factor.

Claims (1)

Tuner, first and second intermediate frequency circuit means 3 and 9, video signal processing means 6 on the main screen, video signal output means 7 on the main screen, video signal processing means 10 on the sub-screen, and sub In the sub-screen on-screen switching circuit of a television composed of an image signal output means 11 or the like of a screen, the input signal discrimination means 20 for receiving and discriminating predetermined data output from a remote control or the like, and discriminating the input signal. The system controller 30 which receives the data received from the means 20 and outputs the blanking data for the overall control and sub-screen of the system and the blanking data for the on-screen, and the sub-screen output from the system controller 30. An input signal synthesizing means 40 for synthesizing blanking data for the on-screen and blanking data for the on-screen, and operated by data output from the input signal synthesizing means 40 Image signal switching means 50 for switching the main screen data including the on-screen output from the output means 7 and the sub-screen data output from the sub-screen video signal output means 11, and outputting the image signal. A sub-screen on-screen switching circuit of a television, comprising drive means (60) for displaying data output by being switched by the switching means (50) on a receiver.