JP3353971B2 - 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 landscape screen television receiver having a parent-child screen (so-called PinP) function.

[0002]

2. Description of the Related Art As is well known, in the current television standard system (NTSC system), the aspect ratio of a screen is set to 4: 3. In the newly proposed high-definition television (Hi-Vision) system,
The aspect ratio is set to 16: 9, and the screen is wider than the NTSC system.

In recent years, a wide-screen television receiver, which employs a picture tube with an aspect ratio of 16: 9 and is compatible with the NTSC system, commonly called a wide-screen television or a wide-screen television, has been commercialized. .

In this wide-screen television, a normal picture Pn of the NTSC system having an aspect ratio of 4: 3 as shown in FIG. 5A is placed on a wide tube surface Scw of a picture tube having an aspect ratio of 16: 9 as shown in FIGS. 6A, and a normal image Pn as shown in FIG. 6A can be displayed as shown in FIG. 6B.

That is, in the case of FIG. 5B, a normal image Pn having an aspect ratio of 4: 3 is enlarged only in the horizontal direction,
Both the horizontal and vertical directions are displayed to fill the wide tube surface Scw with an aspect ratio of 16: 9. In this case, the image is elongated horizontally. In this specification, a mode in which an image is displayed so as to fill the wide tube surface Scw in both the horizontal and vertical directions is referred to as a wide mode.

In the case of FIG. 5C, a wide tube surface Scw
At the center of the image, the normal image Pn is displayed in the vertical direction to fill the tube surface Scw in the vertical direction while maintaining the aspect ratio of 4: 3 as shown by the chain line in the figure, and the fidelity of the original image is maintained. . In this case, as shown by hatched parallel lines in the figure, non-image portions are formed at both left and right ends of the tube surface Scw. In this specification, as described above, the wide tube surface Scw is filled in the vertical direction only in the vertical direction while keeping the aspect ratio of 4: 3.
A mode in which a normal image is displayed is called a normal mode.

In the case of FIG. 6, a normal image Pn as shown in FIG. A is converted into an aspect ratio (4/3) between the wide tube surface Scw and the normal image Pn as shown by a broken line Pz in FIG. ) Expands in both horizontal and vertical directions.
With the aspect ratio of 3, the horizontal direction of the wide tube surface Scw is fully displayed, and the fidelity of the image is maintained. In this case, in the vertical direction, as shown by the dotted line in FIG. 6B, the image frame is larger than the wide tube surface Scw, and a part of the original image in the vertical direction is missing.

In this specification, as shown in FIG.
In the vertical direction, the image frame is enlarged more than the wide screen Scw, and the mode in which a normal image is displayed on the wide screen with the aspect ratio of 4: 3 full and in the horizontal direction is set to the zoom mode. Call.

In the case of FIG. 6, when the normal image Pn of FIG. A is a so-called Vista-size or Cinesco-size horizontally long software in a letter box format,
As shown by the parallel diagonal lines, the non-image portions formed above and below the image are repelled outside the wide screen surface Scw, so that only the desired image can be displayed on the entire screen, and The sense of presence is enhanced.

Further, in the letter box format software, since the position where the video is contained differs depending on the software, the center of enlargement in the vertical direction cannot be fixed. For this reason,
In the wide mode television, in the case of the zoom mode in which the image is enlarged in the vertical direction, the screen can be scrolled in the vertical direction by changing the phases of the vertical synchronization signal and the video signal.

References: Onishi: "Wide Television", Journal of the Institute of Television Engineers, Vol. 47, No. 7, July 1993, etc.

[0012]

By the way, a television receiver having a parent-child screen (PinP) function called a so-called picture-in-picture is conventionally known, and is described in the above-mentioned reference. Like
The above-described wide-screen television generally has a PinP function.

This PinP function is, as shown in FIG.
This is a function of displaying a sub-screen Ps over the currently viewed main screen Pp. In the sub-screen Ps, for example, another image coarsely sampled corresponding to the size ratio with the main screen Pp includes: The image is reduced and displayed via a dedicated memory.

As shown in FIG. 7, the display position of the child screen Ps is not a specific one, but is set to a plurality of child screen display positions Psa to P
sd is set. The user can select one of the plurality of sub-screen display positions Psa to Psd by a sub-screen position switching operation.

By the way, when displaying an image of the NTSC system on a landscape television, a plurality of image display modes as described above can be used without changing the time axis of the video signal and changing the deflection width of the electron beam and the scanning speed. There has been proposed a television receiver that can be realized by a change.

In the case of this type of landscape television receiver,
In the normal mode among the image display modes of the wide-screen television as described above, as shown by a chain line in FIG.
Since the entirety of p is displayed on the picture tube surface Scw, no problem occurs in the PinP function as described above.

However, in the zoom mode, as shown in FIG. 9, the main screen Ppz is enlarged by increasing the deflection width in the vertical direction.
Is enlarged in the vertical direction, so that the image display position is
In the case of the center of pz, as shown by the broken line in FIG. 9, a part of the small screen Ps at each of the small screen display positions Psa to Psd is displayed on the screen S.
There is a problem that the image overflows out of cw and the image of the child screen Ps is partially missing.

When the display position of the zoom image is scrolled upward, as shown by a broken line in FIG.
Although the image is not lost in the child screen Ps at the upper child screen display positions Psa and Psb, the lower child screen display positions Psc and Ps
A part of the child screen Ps of sd overflows outside the tube surface Scw,
The problem of partial omission occurs.

Similarly, when the display position of the zoom image is scrolled downward, the lower sub-screen display position Psc,
The Psd subscreen Ps has no image loss, but the upper subscreen display positions Psa and Psb Psb subscreen Ps partially overflows outside the screen Scw and is partially missing. Occurs.

In view of the above, the present invention provides a wide-screen television receiver having a PinP function.
It is an object of the present invention to provide a television receiver which can prevent a picture on a small screen from being lost in a display mode involving an increase in deflection width in a vertical direction.

[0021]

In order to solve the above-mentioned problems, a television receiver according to the first aspect of the present invention provides a display screen of a picture tube having a wide aspect ratio and an image having a normal aspect ratio. A television receiver capable of projecting in a plurality of display modes by controlling electron beam deflection means, wherein an image mainly displayed on the display screen is used as an image of the main screen, Among a plurality of predetermined sub-screen positions, a sub-screen display unit for displaying an image of the sub-screen at a sub-screen position selected and designated, and the image having the normal aspect ratio is vertically shifted by the deflecting unit. In a display mode for enlarging and displaying the change width of the sub screen, when a change in the vertical deflection position is involved, the sub screen position displayed by the sub screen display means is determined by the predetermined Characterized in that it comprises a display position limiting means child screen limited to 1 or more child screen position without missing of the plurality of child screen position.

According to a second aspect of the present invention, in the television receiver according to the first aspect, in the display mode, the image having the normal aspect ratio is displayed with the change width in the vertical direction enlarged by the deflection means. A display position shifting means for shifting a display position of the child screen on the parent screen where the image of the child screen is missing so that the image of the child screen is not missing on the parent screen. Features.

[0023]

According to the first aspect of the present invention, when the vertical deflection position is changed in the zoom mode involving the vertical deflection width expansion, a plurality of child screen display positions on the main screen are displayed. Since only the child screen display position where the image of the child screen is not missing is selected and displayed as the child screen, the loss of the image of the child screen is prevented. According to the second aspect of the present invention, even in a case where all of the plurality of sub-screen display positions on the main screen are overlaid in the zoom mode in which the deflection width in the vertical direction is enlarged, the display position changing means can control the image. The display position of the child screen where the image is missing is shifted so as to be a position where the image of the child screen is not missing on the parent screen, so that the image of the displayed child screen is prevented from being lost.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a television receiver according to the present invention will be described below with reference to FIGS.

In FIG. 2, 10 is a tuner system, 20 is an audio signal system, 30 is a video signal system, and 40 is a control system.

The tuner system 10 includes a terrestrial broadcasting antenna A
g U / V tuners 1 for receiving broadcast signals from
1, 12; a BS / CS tuner 13 for receiving a broadcast signal from a satellite broadcast antenna As;
And a converter 14 for converting a MUSE signal of a high-definition television broadcast, that is, a so-called high-definition broadcast received into an NTSC signal.

The tuning of the U / V tuners 11 and 12 is performed by a system control circuit (microprocessor) 41 of a control system 40.
Is controlled by The tuning of the BS / CS tuner 13 is controlled by a dedicated microprocessor 15.

Further, the demodulated output Smd of the carrier multiplex control signal of the U / V tuners 11 and 12 is supplied to the microprocessor 41 as audio multiplex mode discrimination information.

From the U / V tuners 11, 12 and the BS / CS tuner 13, composite video signals V11, V12,
V13 and left and right audio signals L11, L12, L13; R11, R1
2 and R13 are output and the signal selector (switch) 16
Respectively. The converter 14 outputs a luminance signal Y14, a carrier chrominance signal C14, and audio signals L14, R14.
Are output and supplied to the signal selector 16.

The selector 16 includes a microprocessor 41
Thus, the composite video signal Vp and audio signals Lp and Rp for the main screen and the composite video signal Vs for the child screen are obtained. The audio signal from the selector 16 is supplied to the audio signal system 20, and the video signal is supplied to the video signal system 30.

The audio signal system 20 includes the audio signal processor 2
1 and left and right speakers 22 and 23. Selector 16
, The volume, sound quality, balance, and the like are adjusted and adjusted by the processor 21 under the control of the microprocessor 41.
The power is supplied to speakers 22 and 23 via a pair of drive amplifiers.

The video signal system 30 includes the video signal processor 3
1, a Y / C separation circuit 32 for a main screen, a signal processing circuit (hereinafter referred to as a PinP circuit) 33 for a sub-screen, and a microprocessor 34 for forming an image frame, using a three-dimensional comb filter using frame correlation. And

The video signal processor 31 to the image frame forming microprocessor 34 are all controlled by the system microprocessor 41.

The composite video signal Vp for the main screen is separated by the Y / C separation circuit 32 into a luminance signal Y32 and a carrier chrominance signal C32, and is returned to the signal selector 16. And
The luminance signal Y32 and the carrier color signal C32 and the converter 1
The luminance signal Y14 and the carrier chrominance signal C14 from 4 are alternatively obtained from the signal selector 16 and supplied to the processor 31.

The composite video signal Vs for the child screen is PinP
In the circuit 33, the luminance signal Y and the color difference signals RY, B-
After being separated and demodulated to Y and subjected to predetermined processing, a blanking signal Y for controlling the display position and size of the small screen is provided.
S is supplied to the video signal processor 31 together with S.

Image frame forming circuit (microprocessor) 3
4 generates a blanking signal S34 for forming an image frame for cutting unnecessary portions in the normal mode and the zoom mode as described above.

The microprocessor 41 has a red R for displaying characters such as a reception channel and a voice mode on a screen.
The three primary color signals S41 of green G and blue B are output. The output signal S41 is added to the blanking signal S34 in the adder 35 and supplied to the video signal processor 31.

Under the control of the microprocessor 41, the video signal processor 31 adjusts the sharpness and brightness of the image, corrects image distortion, and the like. The output signal S31 is supplied to the picture tube 36 via a set of drive amplifiers (not shown),
The image is projected on a wide display screen in one of the plurality of display modes described above.

Under the control of the microprocessor 41, a required deflection current is supplied from the variable deflection circuit 38 to the deflection coil 37 in accordance with the above-described plural kinds of display modes. As shown in FIG. 5B, FIG. 5C, and FIG. 6B, an image is displayed on one or both of the horizontal and vertical directions to fill the wide tube surface Scw. As described above, in the case of the zoom mode of FIG. 6B, the deflection width is expanded in the vertical direction.

In the case of this example, various display modes are realized by changing the beam scanning speed and the deflection width according to the image display mode, and the time axis processing is not performed on the video signal.

The horizontal / vertical synchronization signals H39 and V39 are supplied from a synchronization separation circuit 39 to both the deflection circuit 38 and the image frame forming circuit 34.

The control system 40 includes a system control circuit 41,
A memory 42 for storing information necessary for various controls is provided, and is connected via a so-called I ² C bus 43.

Also, a remote control receiver 44 and operation keys 45
Thus, various kinds of control information from the user, such as channel selection, are input to the microprocessor 41, and control data from the microprocessor 41 is supplied to each unit through a path shown by a dotted line in FIG. .

Next, the operation of controlling the display position of the child screen according to one embodiment of the present invention will be described with reference to FIGS. 1, 3 and 4.

First, in steps S1 and S2 of FIG. 1, whether the zoom position is at the center of the parent screen Ppz as shown in FIG. 3, or as shown in FIG. Alternatively, it is determined whether scrolling is performed downward.

If not, the process proceeds to step S3, and the four small-screen display positions Psa, Psb, and Ps shown in FIG.
The position of the child screen can be selected between sc and Psd. That is,
Movement processing of the child screen position is performed. In this case, since the display mode is the non-zoom mode and does not involve the expansion of the deflection width in the vertical direction, the above-described inconvenience does not occur in the display position of the small screen.

If the zoom position is at the center of the parent screen Ppz, the process proceeds from step S2 to step S4, where the display position of the child screen is such that the display position of the child screen overflows outside the screen Scw shown in FIG. , Psb, Psc, and Psd, as shown in FIG. 3, appropriate positions Qsa, Qsb, and Qs in the picture tube surface Scw.
The display is shifted to c and Qsd so that the child screen does not overflow from the screen Scw. In this case, the transition control of the sub-screen display position is performed by the four sub-screen display positions Psa and P shown in FIG.
This is performed for sb, Psc, and Psd. After performing the transition control of the sub-screen display position, steps S4 to S3 are performed.
To four small screen display positions Qsa, Qsb, Qsc, Qsd
The selection of the position of the child screen is performed.

On the other hand, if the zoom position has been scrolled upward or downward from the main screen Ppz, the process proceeds from step S1 to step S5, and in this step S5, the currently selected sub-screen position is set to the image receiving screen Scw. It is determined whether or not the sub-screen is at a proper position where the image of the sub-screen is not lost.

If it is at the proper position, the process proceeds to step S6, and the position can be selected only among the four sub-screen positions where the image is not lost.
For example, as shown in FIG. 4, when the scroll position of the zoom image is full on the upper side, four child screen positions Psa,
Only the positions Psa and Psb of Psb, Psc and Psd are appropriate positions. Therefore, if the currently selected sub-screen position is one of the two positions Psa and Psb, there is no need to change the sub-screen position, and the position between the two positions Psa and Psb is not changed. You can make a choice.

If it is determined in step S5 that the currently selected small-screen position is not at an appropriate position, the process proceeds to step S7.
To move to a position where the small screen image is not missing among the four small screen positions. For example, in FIG.
Is selected, the child screen position is moved to the position Psa. Then, the process proceeds to step S6, and processing is performed so that the position can be selected only between the child screen positions where the child screen image is not missing.

When it is determined in step S5 that the sub-screen is missing, and the process proceeds to step S7, if there is no proper sub-screen position even if another sub-screen position is checked, the same as in the case where the zoom position is the center position. Then, the child screen is shifted to an appropriate position. Thereafter, the restricted child screen position selection processing can be performed.

As a result, in this embodiment, even in the zoom mode, it is possible to prevent the small screen Ps from overflowing the picture tube screen Scw due to the shift of the display position of the small screen and the restriction on the position selection. You.

[0053]

As described above, according to the present invention, in a wide-screen television receiver having a PinP function, even in a zoom mode involving an increase in the deflection width in the vertical direction, a child screen can be obtained. Since the display position of the screen is shifted inward, and the selection display of the child screens among a plurality of child screen positions is restricted, it is possible to prevent the loss of the image of the child screen.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining the operation of one embodiment of a television receiver according to the present invention.

FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of one embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of one embodiment of the present invention.

FIG. 5 is a diagram for explaining the present invention.

FIG. 6 is a diagram for explaining the present invention.

FIG. 7 is a diagram for explaining the present invention.

FIG. 8 is a diagram for explaining the operation of the conventional example.

FIG. 9 is a diagram for explaining another operation of the conventional example.

FIG. 10 is a diagram for explaining another operation of the conventional example.

[Explanation of symbols]

Reference Signs List 10 Tuner system 20 Audio signal system 30 Video signal system 31 Video signal processor 32 Signal processing circuit for small screen (PinP circuit) 38 Variable deflection circuit 40 Control system 41 System control circuit (microprocessor) 43 Bus Ppz Main screen Ps Small screen Psa , Psb, Psc, Psd Selectable sub-screen display position Qsa, Qsb, Qsc, Qsd Selectable sub-screen display position shifted

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-3579 (JP, A) JP-A-4-196691 (JP, A) JP-A-4-83482 (JP, A) JP-A-2- 50681 (JP, A) JP-A-61-277275 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/38-5/46 H04N 3/22 H04N 5/265

Claims (2)

(57) [Claims] A television receiver capable of projecting an image having a normal aspect ratio on a display screen of a picture tube having a wide aspect ratio in a plurality of display modes by controlling electron beam deflecting means of the picture tube. An image mainly displayed on the display screen as an image of the parent screen, and a child screen at a child screen position selected and designated among a plurality of predetermined child screen positions on the parent screen. A display mode for displaying the image of the normal aspect ratio, and expanding the vertical deflection width by the deflecting means, and displaying the image of the normal aspect ratio. When accompanying, the sub-screen position displayed by the sub-screen display means is limited to only one or a plurality of sub-screen positions in which the sub-screen is not missing among the predetermined plurality of sub-screen positions. Television receiver, characterized in that it comprises the shown position limiting means. 2. The television receiver according to claim 1, wherein in the display mode in which the image having the normal aspect ratio is displayed with the deflection width in the vertical direction expanded by the deflection means, the image of the small screen is displayed. A television receiver provided with display position shifting means for shifting a display position of the child screen on the parent screen to be lost so that an image of the child screen on the parent screen does not become missing. .