JPH0746505A - Television receiver - Google Patents

Abstract

PURPOSE:To prevent an image for master picture and an image for slave picture from being overlapped each other and to prevent the image for master picture from being hidden by a slave picture. CONSTITUTION:When a PIP circuit 28 is not turned on, the aspect ratio of the image for master picture inputted through a switch 16 is converted from 4:3 to 16:9 by an aspect conversion circuit 26 and displayed on a CRT 40. On the other hand, when the PIP circuit 28 is turned on by controlling a remote controller 22, the image for slave picture inputted through a switch 30 is mixed with the image for master picture. At such a time, the aspect ratio of the image for master picture is returned to 4:3 by the aspect conversion circuit 26 and moved to the left side of the CRT 40. Then, the image for slave picture is displayed at the lower right part of the CRT.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly, for example, an aspect ratio of a first video is 4: 3.
The present invention relates to a television receiver having a so-called panoramic function of converting from 16: 9 to 16: 9 and displaying on a screen and a so-called picture-in-picture function of displaying a second video on a part of the screen.

[0002]

2. Description of the Related Art Some conventional television receivers have a picture-in-picture function and can display two screens at the same time.

[0003]

However, in the conventional television receiver, when the picture-in-picture function is used, a part of either screen may be hidden. That is, as shown in FIG. 5, a CRT having an aspect ratio of 16: 9 and a parent screen having an aspect ratio of 4: 3 (BS11c
h) is displayed and a sub screen (8
When displaying ch), the lower right part of the parent screen is hidden. To solve this problem, as shown in FIG. 6, there is a picture-on-picture function of moving the parent screen having an aspect ratio of 4: 3 to the left.

However, in the case of a television receiver in which the aspect ratio of the parent screen is changed from 4: 3 to 16: 9 and displayed, as shown in FIG. 7, a part of the parent screen is hidden by the child screen. The problem arises. Therefore, the main object of the present invention is to use the picture-in-picture function when the aspect ratio of the parent screen is changed from 4: 3 to 16: 9 and displayed, and a part of one screen is It is to provide a television receiver that can be prevented from being hidden by the screen of.

[0005]

The present invention provides a function of converting the aspect ratio of a first image from 4: 3 to 16: 9 and displaying it on a screen having an aspect ratio of 16: 9, and a part of the screen. In a television receiver having a function of displaying a second video, when displaying the second video, the aspect ratio of the first video is converted to 4: 3, and the second video is converted to the first video. The television receiver is characterized in that the first image is moved so as not to overlap.

[0006]

[Function] For example, the aspect ratio is set to 1 by the microcomputer.
When the picture-in-picture function is turned on by, for example, the remote controller while the first image converted to 6: 9 is displayed on the cathode-ray tube, the aspect ratio of the first image is converted to 4: 3. The latter image is moved to, for example, the left side of the CRT. Then, the second image is displayed, for example, in the lower right of the cathode ray tube.

[0007]

According to the present invention, the first image and the second image do not overlap each other, so that the second image does not partially obscure the first image. The above-mentioned object of the present invention,
Other objects, features and advantages will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a television receiver 10 includes tuners 12 and 14, and one of composite video signals received by each of them receives a video chroma circuit 18 and a sync separation circuit 20 via a switch 16. Entered in. The signal input from the switch 16 is for the parent screen, and the signal from the switch 30 described later is for the child screen. The switches 16 and 30 are switched by the CPU 24 by operating the remote controller 22. The video chroma circuit 18 outputs a color difference signal, and the sync separation circuit 20 outputs a horizontal sync signal and a vertical sync signal, which are respectively input to the aspect conversion circuit 26. Then, the CPU 24 converts the aspect ratio from 4: 3 to 16: 9 or maintains the aspect ratio of 4: 3. Of the color difference signal and the synchronization signal output from the aspect conversion circuit 26, the color difference signal is input to the PIP circuit 28.

The PIP circuit 28 also receives one of the composite video signals received by the tuners 12 and 14 selected by the switch 30 and input via the video chroma circuit 32 and the sync signal 34.
The color difference signal processed by the CPU 24 is output from the PIP circuit 28, and R is output by the RGB matrix 36.
It becomes a GB signal, and the RGB signal is CR through the amplifier 38.
Input to T40.

On the other hand, the vertical synchronizing signal and the horizontal synchronizing signal output from the aspect converting circuit are input to the vertical oscillating circuit 42 and the horizontal oscillating circuit 44, respectively, and the sawtooth voltage having a predetermined frequency is output from these oscillating circuits 42 and 44. Is output. Then, the sawtooth voltage from the vertical oscillation circuit 42 is shaped and amplified by the vertical drive output circuit 46,
The sawtooth voltage output from the horizontal oscillator circuit 44 is shaped and amplified by the horizontal drive output circuit 48. After that, both are input to the CRT 40, so that the image is correctly displayed on the CRT 40. The vertical drive output circuit 46 and the horizontal drive output circuit 48 are controlled by the CPU 24, so that the image displayed on the CRT 40 is expanded or contracted in the vertical direction or the horizontal direction.

Subsequently, the CPU 24 when displaying the video signal input from the switches 16 and 30 on the CRT 40.
The processing operation of will be described. First, in step S1, it is determined whether or not the PIP on / off switch of the remote controller 22 is pressed, and when this switch is pressed, the on / off of the PIP circuit 28 is toggled in step S3, and the process proceeds to step S5. On the other hand, if the switch is not pressed in step S1, the process directly goes to step S5. In step S5, it is determined whether the PIP circuit 28 is turned on, and if it is turned on, step S7 is performed.
The aspect ratio of the parent screen is set to 4: 3 and the aspect conversion circuit 26 moves the screen to the left end.
To control. Next, in step S9, the display position of the small screen is designated and the PIP circuit 28 is controlled to mix it. Then, in step S11, the vertical drive output circuit 46 and the horizontal drive output circuit 48 are controlled.

On the other hand, in step S5, the PIP circuit 2
If 8 is not turned on, the aspect conversion circuit 26 is controlled to convert the aspect ratio of the parent screen to 16: 9 in step S13, and the output of the child screen is turned off in step S15. Then, in step S17, the vertical drive circuit 46 and the horizontal drive circuit 48 are controlled.

In operation, if the PIP circuit 28 is not turned on, the aspect ratio of the image for the main screen input from the switch 16 is converted to 16: 9 and displayed on the CRT 40 as shown in FIG. On the other hand, if the PIP circuit 28 is turned on, the aspect ratio of the video for the parent screen is returned to 4: 3 and is shifted to the left side of the CRT. Then, the image for the small screen input from the switch 30 is displayed on the lower right of the CRT 40. That is, the CRT 40 displays a parent screen and a child screen as shown in FIG.

According to the present invention, since the parent screen and the child screen do not overlap with each other, a part of the parent screen is not hidden by the child screen.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a part of the operation of the embodiment in FIG.

FIG. 3 is an illustrative view showing a part of the operation of the embodiment in FIG.

FIG. 4 is an illustrative view showing a part of the operation of the embodiment in FIG. 1;

FIG. 5 is an illustrative view showing a part of the operation of the conventional technique.

FIG. 6 is an illustrative view showing a part of the operation of the conventional technique.

FIG. 7 is an illustrative view showing a part of the operation of the conventional technique.

[Explanation of symbols]

 10 ... Television receiver 18, 32 ... Video chroma circuit 20, 34 ... Synchronous separation circuit 26 ... Aspect conversion circuit 28 ... PIP circuit 36 ... RGB matrix 46 ... Vertical drive output circuit 48 ... Horizontal drive output circuit

Claims (1)

[Claims] 1. The aspect ratio of the first video is from 4: 3 to 1:
In a television receiver having a function of converting to 6: 9 and displaying on a screen having an aspect ratio of 16: 9 and a function of displaying a second video on a part of the screen, when displaying the second video Is characterized in that the aspect ratio of the first image is converted to 4: 3, and the first image is moved so that the second image does not overlap with the first image. TV receiver.