JPH0662340A - Two-screen display circuit - Google Patents

Abstract

PURPOSE:To appreciate two screens without permitting the title of the master screen to be hidden by means of the slave screen by picking-up the title of the master screen and displaying the title on the slave screen when a title part is covered with the slave screen. CONSTITUTION:A video signal for the master screen is selected among the plural inputted video signals and outputted by a master screen signal change- over circuit 11. The master screen video signal is inputted to a master and slave signal synthesizing circuit 20 through, a master screen signal demodulating circuit 15 and a matrix circuit 16. In the meantime, the video signal selected by a slave screen signal change-over circuit 12 as a slave screen signal is inputted to a slave screen signal demodulating circuit 17 to receive a signal- processing, the slave screen is generated by a slave screen generating circuit 18, then, the matrix circuit 19 converts it into an RGB primary color signal and it is inputted to the master and slave signal synthesizing circuit 20. Only the title of the master signal is displayed on the slave screen by inserting the title of only a slave screen area part by the title inserting signal 23 of a title inserting circuit 14 concerning the title picked-up by the master screen video signal or a title picking-up circuit 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual screen display circuit of a television receiver.

[0002]

2. Description of the Related Art In recent years, a television receiver having a dual-screen display function that allows two screens to be viewed at the same time has been made as a high-value-added television receiver. This is a built-in tuner for satellite broadcasting, and with the increase in externally connected devices such as video tape recorders and laser disks, two types of screens can be enjoyed at the same time. FIG. 2 is a conceptual diagram of the dual-screen display function, where 1 is a television receiver, 2 is a main screen image display unit for displaying a first video signal, and 3 is a TV screen for displaying a second video signal. The sub-picture image display unit 4 in which is reduced and inserted shows the frame of the sub-picture.

FIG. 3 shows the configuration of a signal synthesizing circuit of this dual-screen television receiver. From the plurality of input video signals, the main screen signal switching circuit 11 selects and outputs the main screen video signal. The video signal selected as the master screen signal is input to the master screen signal demodulation circuit 15,
Further, it is output as RGB primary color signals through the matrix circuit 16 and input to the parent-child signal synthesizing circuit 20.

On the other hand, the video signal selected as the sub-screen signal by the sub-screen signal switching circuit 12 is input to the sub-screen signal demodulation circuit 17, the sub-screen signal processing is performed, and the sub-screen forming circuit 18 performs the sub-screen. After being reduced to the size of, the RGB primary color signals are output through the matrix circuit 19 and input to the parent-child signal synthesizing circuit 16. Then, by the switching output signal 22 of the child screen forming circuit 18, the parent-child signal synthesizing circuit 20 switches and outputs the primary color signals of the parent screen signal and the child screen signal, respectively, so that two-screen display is performed.

[0005]

However, in the configuration in which the range of the child screen is fixed regardless of the parent screen as described above, essential information of the parent screen such as subtitles is obscured by the child screen and disappears. There was a problem.

In view of the above problems, the present invention provides a circuit in which only a subtitle can be viewed without being hidden in the subscreen without moving the subscreen position with the remote controller so as not to overlap the subtitle.

[0007]

In order to solve the above problems, the present invention extracts a subtitle on a main screen and displays the subtitle on the subscreen when the subtitle is overlapped with the subscreen. It was made possible.

[0008]

With the above-described structure, the present invention allows two screens to be enjoyed without the subtitles on the main screen being hidden by the child screen.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the present invention is shown in FIG.

From the plurality of input video signals, the main screen signal switching circuit 11 selects and outputs the main screen video signal. The parent screen image signal is passed through the parent screen signal demodulation circuit 15 and the matrix circuit 16 and the parent-child signal synthesizing circuit 2
Input to 0. On the other hand, the video signal selected as the sub-screen signal by the sub-screen signal switching circuit 12 is input to the sub-screen signal demodulation circuit 17 for signal processing, and the sub-screen forming circuit 1
After forming the child screen in 8, the matrix circuit 19 performs RGB
It is converted into a primary color signal and input to the parent-child synthesis circuit 20.
The parent-child switching output signal 22 of the child screen forming circuit 18 switches the parent-child signal.

The subtitle extracted from the subscreen video signal by the subtitle extraction circuit 13 is inserted into the subscreen by the subtitle insertion signal 23 by the subtitle insertion circuit 14 so that the subtitle of the parent signal is displayed on the subscreen. Only subtitles are displayed.

[0012]

As described above, according to the present invention, there is provided a circuit which detects a subtitle of a background parent screen and can be viewed without being disturbed by the subscreen even when the subscreen overlaps the subscreen. It is provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a dual-screen display circuit of the present invention.

FIG. 2 is a conceptual diagram of a dual-screen television receiver.

FIG. 3 Conventional dual-screen display circuit

[Explanation of symbols]

 11 parent screen signal switching circuit 12 child screen signal switching circuit 13 caption extraction circuit 14 caption insertion circuit 15 parent screen signal demodulation circuit 16 parent screen signal matrix circuit 17 child screen signal demodulation circuit 18 child screen forming circuit 19 child screen signal matrix Circuit 20 Parent-child signal synthesis circuit 21 Child screen signal processing circuit 22 Parent-child switching signal 23 Subtitle insertion signal

Claims (1)

[Claims] 1. A first video signal switching circuit for outputting a first video signal, a second video signal switching circuit for outputting a second video signal, and a signal processing for inputting a first video signal. A parent screen video signal processing circuit for performing, a child screen video signal processing circuit for inputting a second video signal and performing child screen video signal processing to reduce an image for a child screen, and a first parent screen video signal A parent-child video signal synthesizing circuit for inserting the second sub-screen video signal, and a caption extracting circuit for extracting the caption of the first video signal,
A two-screen display circuit having a caption insertion circuit for inserting the caption extracted by the caption extraction circuit into a sub-screen area portion of the video signal synthesized by the parent-child video signal synthesis circuit.