JPH0344302B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a television receiver that displays an image of another program as a part of the television image being received or the image based on the RGB signal of a personal computer. .

Conventional configuration and its problems In recent years, so-called Picture in Picture (hereinafter referred to as PinP)
A television receiver called ``Television Receiver'' was announced. The idea behind this method is shown below.

FIG. 1 is a conceptual diagram of a PinP television receiver, where 1 is the television receiver, 2 is its main screen portion, and 3 is a sub-screen portion into which another television screen has been reduced and inserted. Television receiver image signal sources include not only on-air broadcast signals, but also video tape recorders, video disk players, text multiplex signals, RGB signals from personal computers, etc. The receiver also has connection terminals to support these signals. The system is designed so that you can enjoy images of various signal sources by switching modes.

However, with the conventional configuration, when in a mode in which an RGB signal image from a personal computer is displayed on the main screen and another program is displayed on the child image, there are the following troubles. That is, most of the RGB signals of personal copiers are text information signals because software is often created or modified. There are many cases where users want to enjoy other programs on a sub-screen while creating software on a personal computer. In such cases, conventionally, the signal of the sub-screen was given first priority and the RGB signal of the personal computer was combined with the RGB signal of the personal computer.
The characters of the software being created are hidden from view by the sub-screen, and as mentioned above, this has the disadvantage that it is not possible to enjoy both at the same time.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks.
To provide a television receiver capable of simultaneously enjoying both a monitor for creating and modifying software on a personal computer and other programs on a sub-screen.

Structure of the Invention A television receiver according to the present invention includes an insertion circuit that inserts a second video signal into a first video signal for a main screen, and a fourth RGB for personal computer into a third video signal for a sub-screen. and a synthesis circuit for obtaining the second video signal superimposed with the signal, and is configured to input the second video signal to the insertion circuit. With this configuration, for example, a personal computer can be displayed on the main screen.
Combines the RGB signal image with the sub screen, giving first priority to the personal computer's RGB signal only in the mode where images of other programs are displayed on the sub screen.
By configuring so-called superimposition, it is possible to eliminate image defects caused by RGB signals from a personal computer or the like due to a sub-screen.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of a television receiver according to an embodiment of the present invention. In FIG. 2, an insertion circuit 11 inserts a composite signal into the main screen video signal and supplies its output to a cathode ray tube 13. This composite signal is generated by giving first priority to the RGB signal of the personal computer in the composition circuit 12.
This is a composite of the child screen video signals. Second
Details of the synthesis circuit 12 shown in the figure are shown in FIG. In the figure, the RGB signal of the personal computer and the video signal for the small screen are connected to fixed terminals a and b of a switch 23, respectively, and are controlled by the output of an OR gate 22. When the output of the OR gate 22 is at a high level, the switch 23 is connected as shown in the figure, and when the output of the OR gate 22 is at a low level, the switch 23 is connected to the lower terminal b. Y _S is a control signal that is at a low level during the child screen display period and at a high level during other periods.

FIG. 4 shows the timing chart and will be explained.
Now, when the R, G, and B signals of the personal computer are as shown in the figure, OR gate 2
The output of 1 is as shown in the figure, and this OR gate 21
The output of and the control signal Y _S are input to the OR gate 22, and its output is at a high level during the personal computer display period, and is at a high level only when there is a personal computer signal even during the sub screen display period.
The switch 23 shown in the figure is controlled. In other words, as shown in FIG. 5, the personal computer signal applied to the child screen is superimposed. Therefore, the RGB signal of the personal computer will not be missing, and the personal computer's RGB signal will not be lost.
You can enjoy both RGB signals and sub-screens.

Effects of the Invention As described above, according to the present invention, in a mode in which an RGB signal from a personal computer, etc. is displayed on the main screen and another program is displayed on the sub screen, the RGB signal from the personal computer, etc. is given first priority. By compositing the video signals for the parent and child screens, this signal is superimposed on the child screen when the RGB signal of a personal computer, etc. is a character signal that would be problematic if part of the signal is missing. This has the excellent effect of allowing people to enjoy their time together.

[Brief explanation of drawings]

FIG. 1 is a front view of a built-in display type television receiver, FIG. 2 is a block diagram of a television receiver according to an embodiment of the present invention, and FIG. 3 is a detail of the synthesis circuit of the receiver of FIG. 2. FIG. 4 is a timing diagram of the same circuit, and FIG. 5 is a front view of its display state. 11... Insertion circuit, 12... Synthesis circuit.

Claims (1)

[Claims] 1 An insertion circuit that inserts a second video signal into a first video signal, and a synthesis circuit that obtains the second video signal by superimposing a fourth RGB signal on a third video signal, A television receiver characterized in that the second video signal is input to the insertion circuit.