JP2831160B2 - Dual screen display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called picture-in-picture ("picture-in-picture") which superimposes and displays a sub-screen on a part of a main screen in a television receiver, a video tape recorder (hereinafter referred to as "VTR") or the like. (Hereinafter referred to as “PinP”).

[0002]

2. Description of the Related Art Recently, in television receivers and the like, the screen of a display device has become larger and higher definition due to the advance of technology, and a new function such as PinP has been added with this. It has become Conventionally, Pin
In the case of P, it is expensive to provide a field memory for the main screen. Therefore, generally, the field memory for the main screen is not provided, but a memory is provided only for the child screen. For this reason, when the device mode is set to the PinP function, it is often desired to project a still image of the main screen in a simple manner, but this is not possible, and only the image of the child screen is displayed as a still image. Could not be done.

[0003]

In the above-described conventional apparatus, when an image projected on the main screen is to be displayed as a still image, first, the mode is switched to the parent-child video signal after switching to the PinP mode, and the main screen is switched. Invert the child screen. Then, the child screen is set to the still image mode, and the image of the original parent screen is displayed as a still image on the child screen.

[0004] Usually, since the viewer mainly views the video signal of the main screen, there is a strong demand to display a still image of the main screen. However, when the still image of the main screen is projected by the above-described method, three-step switching is performed. There is a problem that operation is required and operability is poor.

[0005]

In order to solve the above-mentioned problems, the present invention provides a main screen signal processing means for processing a main screen video signal, a small screen signal processing means for processing a small screen video signal, and Two-screen signal processing means for adjusting the display device and size of the small screen according to the main screen, a memory for recording the information of the small screen, and the small screen processed by the two-screen signal processing means on the main screen. In a two-screen display device provided with a parent-child screen superposition matrix means for superimposing and displaying a child screen superimposed on a part of the parent screen,
Input switching means for independently selecting signals, and a controller
When the controller does not receive the picture-in-picture command , the controller
So that the screen input signal is the same as the main screen input signal
Controls the switching means and sends the main screen signal to the memory.
And the parent-child screen superposition matrix means is OF
F to display only the main screen , receive a picture-in-picture command, and
When the in-picture control signal is input,
Operate the signal processing means and the parent-child screen superposition matrix circuit
To perform normal two-screen display, and receive a picture-in-picture command.
When the in-picture control signal is not input, the
Operating the surface signal processing means and
The picture-in
Display parent image just before receiving picture command as still image
Let it.

[0006]

According to the above arrangement, when the PinP mode is off, only the image of the parent screen is displayed on the display screen, but the signal processing of the child screen is performed on the same screen as the parent screen. Therefore, when projecting a still image of the main screen, Pi
The nP mode may be turned on. That is, when the PinP mode is switched to the ON state, the image of the main screen is continuously displayed on the main screen, and the same video signal as that of the main screen immediately before the switching is recorded in the memory of the sub-screen. It is projected as a still image on the screen.

[0007]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart of an operation procedure of the present invention.
Hereinafter, the present invention will be described in detail with reference to FIGS. In FIG. 1, reference numeral 1 denotes an equipment system controller constituted by a microcomputer or the like which controls an equipment system by an external instruction signal or the like, and reference numerals 2 and 3 denote a video input terminal 11 of a parent image and a child image input terminal 11 by a signal from the equipment system controller 1. A main screen input switching device and a small screen input switching device for switching the video input terminals 12 of images.

Reference numerals 4 and 5 denote a main screen signal processing circuit and a sub screen signal processing circuit for processing video signals of the main screen and the sub screen. PinP processing of the output of the processing circuit 5 to adjust the size of the child screen or the display position on the parent screen based on the signal from the device system controller 1
A P processing circuit 7 is a memory for recording a video signal for one frame of a child screen on which signal processing has been performed by the PinP processing circuit.

Reference numeral 8 denotes a parent / child screen superposition matrix circuit for superimposing the video signal of the child screen from the PinP processing circuit 6 on the video signal of the parent screen from the parent screen signal processing 4, and 9 denotes a signal from the parent / child screen superposition matrix circuit 8. A screen drive circuit 10 for a video signal in which a child screen is superimposed on a derived main screen is a display device such as a cathode ray tube.

The operation will be described below. When the device system controller 1 determines that a normal device operation state in which PinP is turned off and only the main screen is projected is instructed by determining the user's instruction, the child screen input switching device is set.
3 is a control signal a from the device system controller 1
In response to this, the same channel B as the channel (B in the illustrated example) of the main screen input switching device 2 is selected, and the video signal of the same channel B is supplied to the main screen and child screen signal processing circuits 4 and 5. .

In this state, the parent / child screen superposition matrix circuit 8 is in the off state in response to the control signal b from the device system controller 1, so that the video signal of the parent screen guided to the parent screen signal processing circuit 4 is The image is processed and guided to the parent / child screen superimposition matrix circuit 8, but is not superimposed on the child screen, and only the parent screen is displayed on the display device 10 via the screen drive circuit 9.

On the other hand, in the above-described state where only the main screen is displayed, the PinP processing circuit 6 is activated by the control signal c from the equipment system controller 1. The video signal of the same channel as that of the main screen supplied to the sub-screen signal processing circuit 5 is subjected to signal processing by the circuit 5 and then guided to a PinP processing circuit 6 together with a signal from the main screen signal processing circuit 4 so as to be PinP. After the processing, the size of the child screen, the display position on the parent screen, and the like are adjusted and output as a child screen video signal. The child screen video signal derived from the PinP processing circuit 6 is recorded in the memory 7 for one frame, but is not superimposed on the parent screen because the parent / child screen superposition matrix circuit 8 is in the off state.

When a still image of the main screen is to be projected, first, the user inputs a Pin to the device system controller 1.
Give P designation. As a result, the control signal c is given from the device system controller 1 to the PinP processing circuit 6,
A video signal for one frame of the child screen immediately before the control signal c is output is supplied from the memory 7 to the parent-child screen superposition matrix circuit 8.

A control signal b is supplied to the parent-child screen superposition matrix circuit 8 at the same time when PinP is instructed by the user, and the circuit 8 is turned on. Therefore, the video signal for one frame of the child screen from the PinP processing circuit 6 is sent to the parent screen signal processing circuit 4 by the parent / child screen superposition matrix circuit 8.
Is superimposed on the video signal of the main screen from the PC and is displayed on the display device via the screen drive circuit 9.

In this case, the image immediately before the PinP instruction of the parent screen is given is displayed as a still image as a child screen on the display screen of the display device. Thereafter, when a PinP control signal is generated from the device system controller 1 such as a sub-screen input selection or a sub-screen display position change input such as a sub-screen channel selection, the sub-picture still image mode is released.
Normal PinP operation is performed according to the command of the PinP control signal.

FIG. 2 is a flowchart showing the above operation. First, if PinP is off, control signals a, b, and c are output from the device system controller 1, and
The input signal of the child screen is made identical to that of the parent screen, the PinP processing circuit 6 is turned on, the PinP parent / child screen superposition matrix circuit 8 is turned off, only the parent screen is displayed on the display screen, and the child screen is the parent screen. Is recorded in the frame memory 7 for one frame.

If the PinP is ON, the child screen still mode is turned ON by the control signals b and c from the device system controller 1 and the PinP parent / child screen superimposing matrix circuit 8 is turned ON until the PinP control signal is generated. On the child screen, a still image of the main screen is displayed.

When a PinP control signal is generated, a normal PinP operation for superimposing a child screen on a parent screen is performed.

[0019]

Since the present invention has the above configuration, when the PinP displaying only the main screen is switched from the OFF state to the ON state, the still image of the image of the main screen immediately before the switching is switched to the field memory for the main screen. Can be obtained as a PinP sub-screen only by using the memory of the sub-screen without using the sub-screen, and a still image of the main screen can be obtained by an inexpensive circuit configuration and simple operation. Also, according to the present invention,
Display only the screen, independent images on the parent-child screen
To display the still image of the main screen on the sub screen.
State can be suitably performed, and one
Display of the above three states was realized for the first time with the display device
The effect is great.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present invention.

[Explanation of symbols]

 Reference Signs List 1 device system controller 2 main screen input switching device 3 small screen input switching device 4 main screen signal processing circuit 5 small screen signal processing circuit 6 PinP processing circuit 7 memory 8 parent / child screen superimposing matrix circuit

Claims (1)

(57) [Claims] 1. A main screen signal processing means for processing a video signal of a main screen, a sub screen signal processing means for processing a video signal of a sub screen, a display device and a size of the sub screen in accordance with the main screen. A two-screen signal processing unit for adjusting, a memory for recording information of the sub-screen, and a parent-child screen superimposing matrix unit for superimposing the child screen processed by the two-screen signal processing unit on the parent screen are provided. Input switching means for independently selecting input signals of both parent and child screens in a two-screen display device in which a child screen is superimposed and displayed on a part thereof
And a controller, wherein the controller, when not receiving a picture-in-picture command,
So that the screen input signal is the same as the main screen input signal
Controls the switching means and sends the main screen signal to the memory.
And the parent-child screen superposition matrix means is OF
F to display only the main screen , receive a picture-in-picture command, and
When the in-picture control signal is input,
Operate the signal processing means and the parent-child screen superposition matrix circuit
To perform normal two-screen display, and receive a picture-in-picture command.
When the in-picture control signal is not input, the
Operating the surface signal processing means and
The picture-in
Display parent image just before receiving picture command as still image
Dual-screen display device, characterized in that cause.