JP3319622B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver capable of zooming and displaying a video signal having a different aspect ratio on a display device having a predetermined aspect ratio.

[0002]

2. Description of the Related Art Conventionally, as a method of zoom-displaying a 4: 3 video signal on a display device having an aspect ratio of 16: 9,
As shown in FIG. 5, there is a method of enlarging with a deflection system. In this method, a child screen or message display of PinP (Picture-in-Picture) positioned in the effective screen in the normal mode as shown in FIG. 6 is changed to the effective screen in the zoom mode as shown in FIG. They run out or disappear completely.

[0003]

Conventionally, in order to prevent the PinP child screen or message display from protruding out of the effective screen or completely disappearing in the zoom mode, the positions of the PinP child screens and the message display are controlled by software. Since it is necessary to shift by processing or to recreate the display position determination reference pulse using a PLL or the like, software processing becomes complicated or an additional circuit such as a PLL is required.
The cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and it is possible to arrange a position of a PinP child screen or a message display in an effective screen in a zoom mode with a simple configuration and at low cost. It is an object to provide a television receiver.

[0005]

According to the present invention, there is provided a television receiver, wherein a predetermined display for performing zoom display on a display device is provided.
Of the video signal as a reference signal for position setting
Use the vertical blanking pulse detected earlier than
When performing a fixed display at the top of the display screen,
The reference pulse is detected at the falling edge of the blanking pulse.
Out of the screen and perform a predetermined display at the lower position of the screen of the display device.
The reference pulse at the rising edge of the vertical blanking pulse.
It is characterized by detecting a loose .

When a zoom display is performed on a display device, a predetermined
As a reference signal for setting the display position,
Use the inverted vertical blanking pulse detected before the display of
When a predetermined display is performed at a position above the screen of the display device,
At the rising edge of the inverted vertical blanking pulse.
Detects the quasi-pulse and displays the specified display at the bottom of the screen of the display device.
Falling edge of inverted vertical blanking pulse when
At the edge, the reference pulse can be detected
You.

[0007] The predetermined display is a display of a sub-screen or a message.
Page display.

[0008]

According to the television receiver of the present invention, a predetermined display position for zoom display on the display device is set.
As the reference signal, the video signal is detected before the specified display.
The vertical blanking pulse generated is used to
When performing this operation at a position above the screen of the display device, the vertical blanking
At the falling edge of the pulse, the reference pulse is detected and
When performing a fixed display at the lower position of the screen of the display device,
The reference pulse is detected at the rising edge of the blanking pulse.
Will be issued .

[0009]

FIG. 1 shows an example of an object to which the present invention is applied.
3 shows a basic configuration of a television receiver that can display P. The tuner 2 outputs video signals of various broadcasts such as BS, UHF, VHF and CATV. The switch SW1 selects one of a video signal from the tuner 2 and a video signal input to a video (VIDEO) input terminal, and supplies the video signal to the video signal processing circuit 4. The switch SW2 selects one of the video signal from the tuner 2 and the video signal input to the video (VIDEO) input terminal, and is supplied to the PinP processing circuit 4.

The video signal processing circuit 4 performs Y / C separation, chroma decoding, synchronization separation,
A process such as an aspect ratio conversion is performed to output a main screen video signal to the switch SW3, and the separated horizontal synchronization pulse and vertical synchronization pulse are transmitted to the PinP processing circuit 6, the character generator 12, and the deflection processing circuit 1.
4 The PinP processing circuit 6 includes a switch SW2
Video signal processing circuit 4
Performs a PinP process in accordance with the horizontal synchronization pulse and the vertical synchronization pulse supplied from, and outputs a small-screen video signal.

The switch SW3 supplies the video signal processing circuit 8 with either the parent screen video signal or the child screen video signal. The video signal signal processing circuit 8 includes a switch SW3
Performs sharpness control, picture control, conversion to a PGB signal, amplification processing, etc. on the video signal supplied from the
Supply 10 Further, the video signal processing circuit 8 superimposes the message pattern output from the character generator 12 on the video signal and supplies it to the CRT 10.

The deflection processing circuit 14 generates a deflection waveform based on the horizontal synchronizing pulse and the vertical synchronizing pulse,
It is supplied to the deflection yoke (DY) of T10. Deflection circuit 14
Converts a video signal with an aspect ratio of 4: 3 to an aspect ratio of 1.
In the case of zoom display on the screen of the CRT 10 of 6: 9,
As shown in FIG. 5, the image is enlarged by increasing the amplitude in the vertical direction (the horizontal direction is enlarged by signal processing). At this time, a large amount of offset is applied to the image, and as shown in FIG.
If the PinP screen or message is displayed as it is, it will be out of the valid screen of T10,
0 is hidden by the invalid screen part.

The reason for this is that, for example, when a PinP sub-screen is displayed, the reference signal for determining the vertical position is a vertical synchronization pulse (V.PULSE) of the main screen. For example, as shown in FIG.
The display is set to start from the 20th line (the position of the sub-screen PU in FIG. 2) from the vertical synchronization pulse. If the 20th line is changed to the 15th line or the 25th line, for example, The display position can be finely adjusted up and down, and if the display position is changed to, for example, the 160th line, the display position of the small screen can be moved downward (the position of the small screen PD in FIG. 2). When the zoom display is performed as shown in the figure, the vertical synchronization pulse is generated at the time corresponding to the upper end and the lower end of the enlarged image. When the screen PU is displayed, as shown in FIG.
It protrudes from 0S.

In order to prevent this, conventionally, the child screen P
The software processing using the microcomputer is performed such that the display start line of U is from the 20th line to the 50th line (from the vertical synchronizing pulse). However, in this case, the software processing becomes complicated. .

When the display start position changing function by software processing is not provided, a vertical synchronizing pulse is generated by using a PLL circuit or a counter as shown in the right part of FIG. It was necessary to shift and recreate the reference signal for setting the sub-screen position.

The present invention eliminates the need for the above-mentioned software processing and shifting of the vertical synchronizing pulse for generating the reference signal for setting the sub-screen position during zoom display. A vertical blanking signal is used as a position setting reference signal. The vertical blanking signal is used to prevent the electron beam from being generated only in that section in order to make the blanking of the vertical deflection invisible or to prevent the electron beam from colliding with the upper, lower and side surfaces of the CRT 10. This is the signal to perform. The vertical retrace signal is always used in the television receiver and does not need to be recreated.

FIG. 4 shows the relationship between the vertical blanking pulse signal and the inverted vertical blanking pulse signal according to the present invention and the display position of the child screen in PinP in the zoom display mode of the television receiver of FIG. . When the reference pulse that determines the display position of the sub-screen or message is detected based on the rising edge of the pulse, the display of the sub-screen or the like is performed by
When performing at a position above the screen of RT10 (for example, the upper left position or the upper right position) (in the example of FIG. 4, the position of the child screen PU is at the upper left), if an inverted vertical blanking pulse is used as a position setting reference signal, Even if the display position remains at the 20th line, the display of the child screen or the like fits within the effective screen 10S of the CRT 10, and the display of the child screen or the like is positioned below the screen of the CRT 10 (for example, the lower left position or the right position). When the vertical blanking pulse is used as the reference signal for position setting (in the example of FIG. 4, the position of the child screen PD is at the lower left), even if the display position remains at the 160th line, , Sub-screens, etc., fit within the effective screen 10S of the CRT 10.

When the reference pulse for determining the display position of the sub-screen is detected based on the falling edge of the pulse, and when the display of the sub-screen is desired to be performed at a position above the screen of the CRT 10, the reference signal for position setting is used. If the vertical blanking pulse is used, even if the display position remains at the 20th line, the display of the child screen or the like will fit within the effective screen 10S of the CRT 10, and the display of the child screen will be displayed below the screen of the CRT 10. When the inverted vertical blanking pulse is used as the position setting reference signal when the display position is the 160th line, the display of the child screen or the like is performed on the CRT 10.
In the effective screen 10S.

In the above embodiment, an image signal having an aspect ratio of 4: 3 is displayed on a screen having an aspect ratio of 16: 9. However, the present invention is not limited to this. The present invention can be applied to a television receiver capable of zooming and displaying a video signal having a different aspect ratio on the display device.

[0020]

According to the television receiver of the present invention, a predetermined display position when zoom display is performed on the display device.
As a reference signal for setting,
Using the vertical blanking pulse detected earlier,
When performing display at a position above the screen of the display device, vertical retrace
Reference pulse detected at falling edge of erase pulse
When a predetermined display is performed at a position below the screen of the display device,
The reference pulse at the rising edge of the vertical blanking pulse.
Luth is detected , so simple and low cost,
PinP child screens and message display positions can be arranged in the effective screen.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a basic configuration of a television receiver capable of displaying PinP, which is an example to which the present invention is applied.

2 is a diagram showing a relationship between a vertical synchronization pulse (V. PULSE) and a display position of a child screen in PinP in the television receiver of FIG.

3 is a vertical synchronization pulse (V. PULSE) and PinP in the zoom display mode of the television receiver in FIG.
FIG. 7 is a diagram showing a relationship with a display position of a child screen in FIG.

4 is a diagram showing a relationship between a vertical blanking signal and an inverted vertical blanking signal according to the present invention and a display position of a child screen in PinP in a zoom display mode of the television receiver in FIG. 1;

FIG. 5 is a diagram illustrating zoom display by increasing the vertical amplitude.

FIG. 6 is a diagram illustrating an example of a display position of a PinP child screen and a message in a normal mode.

FIG. 7 is a diagram illustrating an example of a display position of a PinP child screen or a display position of a message in a conventional zoom mode.

[Description of Signs] 2 Tuner 4 Video signal processing circuit 6 PinP circuit 8 Video signal processing circuit 10 CRT 12 Character generator 14 Deflection processing circuit

Continuation of front page (56) References JP-A-3-60583 (JP, A) JP-A-4-306980 (JP, A) JP-A-63-185173 (JP, A) JP-A-60-19370 (JP) , A) Japanese Utility Model Hei 3-61765 (JP, U) Japanese Utility Model Application Sho 62-151275 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/38-5/46

Claims (3)

(57) [Claims] 1. A display device having a predetermined aspect ratio for setting a predetermined display position when performing a zoom display on the display device in a television receiver capable of zooming and displaying a video signal different from the predetermined aspect ratio. As a reference signal, the video signal is detected earlier than the predetermined display.
The predetermined display is performed at a position above the screen of the display device using a vertical blanking pulse that is used.
At the falling edge of the vertical blanking pulse,
Detecting a reference pulse and displaying the predetermined display on the display device;
When performed at the lower position of the screen, the vertical blanking pulse
A television receiver detecting the reference pulse at a rising edge . 2. A method according to claim 1, wherein a zoom display is performed on said display device.
As the reference signal for setting the position of a predetermined display, the video signal
Of the inverted vertical retrace detected before the predetermined display
The predetermined display is performed at a position above the screen of the display device using an erase pulse.
The rising edge of the inverted vertical blanking pulse
Detecting the reference pulse and displaying the predetermined display in the table.
When performed at a position below the screen of the display device, the inverted vertical retrace
The reference pulse is detected at the falling edge of the erase pulse.
The television according to claim 1, wherein the television is output.
Receiver. 3. The television receiver according to claim 1, wherein the predetermined display is a display of a child screen or a display of a message.