JPH1198423A - Display device and display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a display device whose screen image is not unpleasant even when the presence of a caption is mis-detected by discriminating the screen image is a standard image or a laterally long image, setting the display mode depending on the shape of the screen image, setting an aspect ratio and the display device in response to the display mode and providing an image not causing black stripes to an upper part of the image in the laterally long image display mode. SOLUTION: An infrared ray signal is fed to a controller 3 from a remote commander 19 via a light receiving section 18 and a display mode is set. A television receiver is provided with a wide screen image discrimination circuit 10. The wide screen image discrimination circuit 10 discriminates whether a received video signal is a standard image screen signal or a wide image screen signal, and in the case of the wide screen image, the circuit 10 discriminates whether or not the screen image is with/without a caption. A discrimination signal from the wide screen image discrimination circuit 10 is fed to the controller 3, which decides the display mode. A setting signal for the display mode is fed to an image screen setting circuit 13 or a deflection circuit 16, by which an aspect ratio and a display position are set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention judges whether an input video signal is of a standard screen or a wide screen,
The present invention relates to a display device and a display method in which an aspect ratio and a screen position of a screen are set in accordance therewith. Particularly, when displaying a wide screen having a subtitle in a black band portion of the screen, the subtitle is surely displayed. Related to those that can be displayed on the screen.

[0002]

2. Description of the Related Art Wide-screen television receivers having an aspect ratio of 16: 9 have become widespread. In such a wide-screen television receiver, in addition to the video source of the current NTSC standard screen having an aspect ratio of 4: 3, a screen having an aspect ratio of 16: 9 similar to HDTV (High Definition Television) is used. And a cinema-sized video source having an aspect ratio of 2: 1 are input.

A wide-screen television receiver has a function of switching the display mode according to these various aspect ratios and setting the aspect ratio and display position of the screen.

When the display mode is switched in accordance with such a video source, manual switching is difficult and difficult to use. Therefore, it is determined whether the input video signal is of a standard screen or a wide screen, and the display mode is switched accordingly.

[0005] Whether an input video signal is of a standard screen or a wide screen is determined by, for example, whether or not there are black bands at the top and bottom of the screen. That is, in the case of a wide screen, since black bands are formed above and below the screen, the luminance levels of the signals above and below the screen are substantially black levels. Therefore, it can be determined whether the screen is a standard screen or a wide screen based on whether or not the luminance levels of the signals above and below the screen are substantially the black level.

In a conventional wide-screen television receiver, when the input video source is a standard screen having an aspect ratio of 4: 3, black bands are displayed on the left and right sides of the screen, and the aspect ratio is displayed at the center of the screen. Display a 4: 3 screen, or
The screen is widened in the left-right direction and displayed on a 16: 9 screen. If the input video source is a wide screen similar to the HDTV system with an aspect ratio of 16: 9, the video is displayed so as to fit the 16: 9 screen. If the input video source has an aspect ratio of 2:
In the case of a wide screen similar to the cinema size of 1, a black band is displayed at the top and bottom of the screen, and a screen having an aspect ratio of 2: 1 is displayed at the center of the screen.

[0007]

As described above, conventionally, when an input video source is a wide screen similar to a cinema size having an aspect ratio of 2: 1, black and white of approximately the same size are provided above and below the screen. A band is displayed, and a screen having an aspect ratio of 2: 1 is displayed at the center of the screen.

[0008] However, some wide screens similar to the 2: 1 cinema size have subtitles, such as movie dialogue, inserted in the black band at the bottom of the screen. When subtitles are inserted in the black band at the bottom of the screen, black bands of approximately the same size are displayed at the top and bottom of the screen, and when the screen with an aspect ratio of 2: 1 is displayed at the center of the screen, the subtitles are displayed. Problems such as chipping and subtitles becoming difficult to see arise.

Therefore, for example, it is determined whether or not the screen is a wide screen with subtitles. In the case of a wide screen with subtitles, the screen is moved so that the subtitles are easy to see, or the subtitles are extracted by extracting the screen subtitles. It is conceivable to change the display mode, for example, by moving.

However, if the display mode is switched after judging whether or not the screen is a wide screen with subtitles, the display mode is suddenly switched when the wide screen with subtitles is erroneously detected. The problem of becoming unsightly arises.

That is, whether or not there is a caption in the black band portion is determined by analyzing the luminance distribution in the black band portion. That is, it is detected whether or not there is a point having a high luminance in the black belt portion, and it is determined whether or not there is a subtitle.

However, in the case of a reproduced video signal of a tape having repeated dubbing or a received signal in a place where the electric field strength is weak, a black band portion is produced due to the influence of noise, despite the fact that it is not a wide screen with subtitles. Has a point with high luminance. In such a case, it is erroneously detected whether or not the screen is a wide screen with subtitles. In some cases, a scene without subtitles continues for a long time. Also in such a case, it is erroneously detected that there is no subtitle.

When the display mode is switched by judging whether or not the screen is a wide screen with subtitles, when the wide screen with subtitles is erroneously detected due to the influence of such noise, or when there is no subtitle, When the scene is continuously detected for a long time and is incorrectly detected as a wide screen with subtitles, the display mode is suddenly switched.

Therefore, an object of the present invention is to prevent the subtitles from being difficult to see in the case of a wide screen with subtitles in which subtitles are present in the black band, and to erroneously detect whether or not subtitles exist. Even in such a case, it is an object of the present invention to provide a display device and a display method in which the screen is not difficult to see.

According to the present invention, there is provided a means for determining whether a screen is a standard screen or a landscape screen, a control means for setting a standard screen display mode or a landscape screen display mode depending on whether the screen is a standard screen or a landscape screen, and a display mode. Means for setting an aspect ratio and a display position of the screen in accordance with the screen, and in the landscape screen display mode, the screen is arranged so that a black band does not occur above the screen. is there.

According to the present invention, there is provided a means for determining whether a screen is a standard screen, a landscape screen, or a landscape screen with subtitles, a standard screen display mode according to whether the landscape screen is a standard screen, a landscape screen, or a landscape screen with subtitles.
The display device further comprises control means for setting a landscape screen display mode and a landscape screen display mode with subtitles, respectively, and means for setting an aspect ratio and a display position of a screen according to the display mode. A display device characterized in that mode transition to a screen display mode is prohibited.

It is determined whether the screen is the standard screen or the landscape screen. In the landscape screen display mode, the screen is arranged so that a black band does not occur above the screen. As a result, even if the presence or absence of subtitles is erroneously determined, the screen is positioned at the top, the subtitles in the lower black belt part are easy to see, and the screen position is suddenly switched due to the erroneous determination of the presence or absence of subtitles. Can be prevented.

It is determined whether the screen is a standard screen, a landscape screen, or a landscape screen having subtitles in a black band, and the standard screen, landscape screen, or landscape screen with subtitles in a black band is determined according to the landscape screen. After setting the display mode, the landscape screen display mode, and the landscape screen display mode with subtitles respectively, the mode transition from the landscape screen display mode with subtitles to the landscape screen display mode is prohibited. Therefore, even if the presence or absence of subtitles is erroneously determined when the display mode is a landscape screen with subtitles, the screen is not moved, and the subtitles in the lower black band are maintained in an easily viewable state. Also, it is possible to prevent the screen position from suddenly switching due to erroneous determination of the presence or absence of a subtitle.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a television receiver to which the present invention can be applied. In FIG. 1, a received signal from an antenna 1 is supplied to a tuner circuit 2. The tuner circuit 2 and the controller 3
The receiving channel is set based on the channel setting signal from. The tuner circuit 2 selects a signal of a desired channel from the received signals, and converts the received signal into a predetermined intermediate frequency signal.

The output of the tuner circuit 2 is supplied to an intermediate frequency circuit 4. In the intermediate frequency circuit 4, the output of the tuner circuit 2 is amplified, and the video signal is detected. The intermediate frequency circuit 4 outputs, for example, an NTSC video signal.

The output of the intermediate frequency circuit 4 is a source selector 5
Is supplied to the input terminal 5A. An external video signal is supplied from a video input terminal 6 to an input terminal 5B of the source selector 5. The input selector 5 switches between a video signal received by the antenna 1 and a video signal from an external video input terminal based on a control signal from the controller 3.

The output of the input selector 5 is supplied to the A / D converter 7. The video signal is digitized by the A / D converter 7. Output of A / D converter 7 is Y
/ C separation circuit 8 and to the synchronization separation circuit 9. The output of the A / D converter 7 is supplied to the wide screen determination circuit 10.

The horizontal and vertical synchronization signals in the input video signal are detected by the synchronization separation circuit 9. This synchronization signal is supplied to the deflection circuit 16 and also to the screen setting circuit 13.

The wide screen determination circuit 10 determines whether the input video signal is a standard screen signal or a wide screen signal. Further, in the case of a wide screen, it is determined whether or not subtitles are attached to a black band on the lower side of the screen.

The determination as to whether the input video signal is of a standard screen or of a wide screen is made, for example, by determining whether or not the luminance levels of the signals above and below the screen are substantially black. Done. That is, if the luminance levels of the signals above and below the screen are substantially black levels, the signal is a wide screen signal; otherwise, it is a standard screen signal. The determination as to whether or not there is a caption in the black belt portion can be performed, for example, by detecting whether or not there is a point having high luminance in the black belt portion.
That is, it is determined that there is a caption if a high-luminance point is included in the black belt portion at a predetermined value or more, and otherwise, it is determined that there is no caption.

As described above, the wide screen determination circuit 10
Can obtain a wide-screen discrimination signal. The determination signal from the wide screen determination circuit 10 is supplied to the controller 3.

The video signal is separated by the Y / C separation circuit 8 into a luminance signal and a chroma signal. The chroma signal separated by the Y / C separation circuit 8 is further supplied to a chroma demodulation circuit 12. The color difference signals RY and BY are demodulated from the chroma signal by the chroma demodulation circuit 12. The luminance signal from the Y / C separation circuit 8 and the color difference signals RY and BY from the chroma demodulation circuit 12 are supplied to a screen setting circuit 13.

The screen setting circuit 13 sets the aspect ratio and the screen position according to whether the input video signal is a standard screen signal, a wide screen signal, or a wide screen signal with subtitles. The screen setting circuit 13 is configured by, for example, an image memory. The size of the screen can be set based on the relationship between the write clock and the read clock of the image memory, thereby changing the aspect ratio. Further, the screen position can be set by shifting the reading start position of the image memory.

The output of the screen setting circuit 13 is supplied to a matrix circuit 14. The matrix circuit 14 forms three primary color signals from the luminance signal and the color difference signals RY and BY.

The output of the matrix circuit 14 is supplied to a D / A converter 15. By the D / A converter 15,
The three primary color signals of the digital signal are converted into analog signals. The output of the D / A converter 15 is supplied to a horizontally long picture tube 17 having an aspect ratio of 16: 9.

The synchronization signal is supplied from the synchronization separation circuit 9 to the deflection circuit 16. The deflection circuit 16 generates horizontal and vertical deflection currents based on the synchronization signal. The horizontal and vertical deflection currents are supplied to the picture tube 17.

The aspect ratio of the screen can also be set by controlling the deflection current from the deflection circuit 16. Further, by controlling the deflection circuit 16, the screen can be distorted as required.

An infrared signal from a remote commander 19 is supplied to the controller 3 via a light receiving section 18. Through the operation of the remote commander 19, setting of a receiving channel and setting of a display mode can be performed.

As described above, in the television receiver to which the present invention can be applied, the wide screen determination circuit 10 is provided. The wide screen determination circuit 10 determines whether the input video signal is a standard screen or a wide screen. Furthermore,
In the case of a wide screen, it is determined whether the screen is a wide screen with subtitles or a wide screen without subtitles. The determination signal from the wide screen determination circuit 10 is supplied to the controller 3. The controller 3 determines the display mode based on the determination signal from the wide screen determination circuit 10. The display mode setting signal is supplied to the screen setting circuit 13 or the deflection circuit 16. Thereby, the aspect ratio and the display position are set according to the display mode.

FIG. 2 shows an example of a process for setting a display mode in accordance with the result of determination by the wide screen determination circuit 10.

In FIG. 2, it is determined whether or not a safe mode is set (step S1). In the safe mode, if it is easy to make a mistake in determining whether or not the screen is a wide screen with subtitles, for example, a reproduced video signal of a tape that has been dubbed repeatedly, a received signal in a place where the electric field strength is weak, or a scene without subtitles Is set in such a case that continues for a long time. Safe mode is
The setting may be performed by the user or may be set by default.

If the mode is not the safe mode, it is determined based on the determination signal from the wide screen determination circuit 10 whether the screen is a standard screen or a wide screen (step S2). In the case of the standard screen, it is set to the standard screen display mode (step S3),
It returns to step S2.

If it is determined in step S2 that the screen is a wide screen, the output of the wide screen determination circuit 10 is
It is determined whether or not there is a subtitle in the black belt portion (Step S)
4). If there is no caption, the mode is set to the wide screen display mode (step S5), and the process returns to step S2. If there is a caption, the mode is set to the wide screen display mode with caption (step S6), and the process returns to step S2.

If it is determined in step S1 that the mode is the safe mode, it is determined whether the screen is a standard screen or a wide screen (step S7). If it is determined that the screen is the standard screen, the mode is set to the standard screen display mode (step S
8), the process returns to step S7. If it is determined that the screen is the wide screen, the mode is set to the wide screen display mode with captions (step S9), and the process returns to step S7.

In the case of the standard screen display mode, for example,
As shown in FIG. 3A, a black band is displayed on the left and right sides of a screen with an aspect ratio of 16: 9, and the screen is displayed on a screen with an aspect ratio of 4: 3 in the center of the screen, or as shown in FIG. 3B. The screen having the aspect ratio of 4: 3 is expanded in the horizontal direction and displayed on the screen having the aspect ratio of 16: 9. Then, the process returns to step S2.

In the wide screen display mode, a wide screen is displayed at the center of a screen having an aspect ratio of 16: 9. Therefore, in the wide screen display mode, when the input video source is a wide screen similar to a cinema size having an aspect ratio of 2: 1, black bands are displayed at the top and bottom of the screen as shown in FIG. A screen having an aspect ratio of 2: 1 is displayed at the center.

In the wide screen display mode with subtitles, the aspect ratio is 16: 9 so that the black band is formed only on the lower side.
The wide screen is displayed on the screen. Therefore, if the input video source is a wide screen similar to a cinema size with an aspect ratio of 2: 1, as shown in FIG. A black band is displayed only on the side.

As described above, in this example, when the safe mode is set, as shown in steps S7 to S9, if it is determined that the screen is a wide screen, there is a caption in the black band on the lower side of the screen. Regardless of whether or not it is set, the wide screen display mode with subtitles is set, and the normal wide screen display mode is not set.

In the case of a reproduced video signal of a tape having repeated dubbing or a received signal in a place where the electric field strength is weak, there is a high possibility of erroneously detecting whether or not a wide screen with subtitles is present due to the influence of noise. . If a scene without subtitles continues for a long time, it is erroneously detected that there is no subtitle.

When the mode is not the safe mode, if it is erroneously determined that there is no subtitle despite the presence of the subtitle, the wide-screen display mode is set. In the wide screen display mode, FIG.
As shown in, subtitles are placed at the bottom of the screen,
Subtitles may be missing or difficult to see. When the mode is not the safe mode, the wide-screen display mode and the wide-screen display mode with subtitles may suddenly be switched, resulting in an unsightly screen.

On the other hand, if the safe mode is set, even if the presence or absence of subtitles is erroneously determined, the wide-screen display mode with subtitles is always provided as shown in FIG. It is not possible to suddenly switch between the mode and the wide screen display mode with subtitles.

It should be noted that even if the screen is shifted to the upper end in the wide screen display mode with captions, the captions may not be able to fit within the screen. In such a case, it is conceivable to distort the lower part of the vertical deflection so that the caption can be sufficiently displayed.

FIG. 7 shows another example of the processing for setting the display mode in accordance with the result of the judgment by the wide screen judgment circuit 10. In FIG. 7, it is determined whether or not the mode is the safe mode (step S11). If the mode is not the safe mode, it is determined from the output of the wide screen determination circuit 10 whether the screen is a standard screen or a wide screen (step S12). In the case of the standard screen, the standard screen display mode is set (step S1).
3), returning to step S12.

If it is determined in step S12 that the screen is a wide screen, it is determined from the output of the wide screen determination circuit 10 whether or not there is a caption in a black band portion (step S12).
14). If there is no caption, the mode is set to the wide screen display mode (step S15), and the process returns to step S12. If there is a caption, the mode is set to the wide screen display mode with caption (step S16), and the process returns to step S12.

If it is determined in step S11 that the mode is the safe mode, it is determined whether the screen is a standard screen or a wide screen (step S17). If it is determined that the screen is the standard screen, the mode is set to the standard screen display mode (step S
18). If it is determined that the screen is a wide screen, it is determined whether or not there is a subtitle in the black belt portion (step S1).
9). If there is no subtitle, the wide-screen display mode is set (step S20). If there is a subtitle, the wide-screen display mode with subtitle is set (step S20).
21).

When the standard screen display mode is set in step S18, it is determined whether the screen is a standard screen or a wide screen (step S22). In the case of the standard screen, step S18
Is returned to If it is determined that the screen is a wide screen, it is determined whether or not there is a subtitle in the black belt portion (step S23). If there is no subtitle, the procedure goes to step S20, and the wide-screen display mode is set. If there is a subtitle, the process proceeds to step 21 and the wide-screen display mode with subtitles is set.

When the wide screen display mode is set in step S20, it is determined whether the screen is a standard screen or a wide screen (step S24). In the case of the standard screen, step S
Go to 18 and set to the standard screen display mode. If it is determined that the screen is a wide screen, it is determined whether or not there is a caption in the black belt portion (step S25). If there is no caption, the process returns to step S20. If there is a subtitle, the process proceeds to step 21 and the wide-screen display mode with subtitles is set.

When the wide screen display mode with subtitles is set in step S21, it is determined whether the screen is a standard screen or a wide screen (step S26). In the case of the standard screen, the procedure goes to step S18, and the standard screen display mode is set.
If it is determined that the screen is a wide screen, step 21
Is returned to

As described above, in this example, when the safe mode is set, as shown in steps S17 to S21,
The standard screen is set to the standard screen display mode (see FIG. 3), the wide screen without subtitles is set to the wide screen display mode (see FIG. 4), and the wide side with subtitles is set to the wide screen display mode with subtitles (see FIG. 5). .

Then, in the case of the standard screen display mode,
As shown in steps S18, S22, and S23, if the standard screen remains, the standard screen display mode is maintained. If it is determined that the wide screen without subtitles has been entered, the mode is shifted to the wide screen display mode, and the wide screen with subtitles is obtained. If it is determined that the sub-screen has been displayed, the mode is transited to the wide-screen display mode with subtitles.

In the case of the wide screen display mode, as shown in steps S20, S24 and S25, if the wide screen without subtitles remains, the wide screen display mode is maintained.
If it is determined that the screen has become the standard screen, the mode transits to the standard screen display mode. If it is determined that the screen becomes the wide screen without captions, the mode transits to the wide screen display mode.

In the case of the wide screen display mode with subtitles, as shown in steps S21 and S26, if the wide screen with subtitles remains, the mode is maintained in the wide screen display mode with subtitles. Transition to the standard screen display mode is made.

As described above, the state transition from the wide screen display mode with subtitles to the wide screen display mode is prohibited. That is, when the mode is not the safe mode, FIG.
As shown in the state transition diagram in FIG.
The mode transition is possible in all the modes between the wide screen display mode ST2 and the wide screen display mode with subtitles ST3. On the other hand, when the safe mode is set, as shown in FIG.
3 to the wide screen display mode ST2 is prohibited.

When the safe mode is not set, the effect of noise and the absence of subtitles continue from the state in which the wide screen display with subtitles is set to the wide screen display mode with subtitles for a while. If erroneously determined that there is no subtitle, the mode transits to the wide screen display mode, and the subtitle may be missing or the subtitle may be difficult to see. When not in safe mode,
The wide-screen display mode and the wide-screen display mode with subtitles may suddenly switch, resulting in an unsightly screen.

On the other hand, if the safe mode is set, the state transition from the wide screen display mode with subtitles to the wide screen display mode does not occur. Therefore, even if the presence or absence of subtitles is erroneously determined in the wide screen with subtitles display mode on a wide screen with subtitles,
The wide screen display mode with captions as shown in FIG. 5 is always provided, so that the captions are easy to see, and the sudden switching between the wide screen display mode and the wide screen display mode with captions does not occur.

[0061]

According to the first or third aspect of the present invention, it is determined whether the screen is a standard screen or a landscape screen. In the landscape screen display mode, the screen is arranged so that no black band is formed above the screen. Is done. As a result, even if the presence or absence of subtitles is erroneously determined, the screen is positioned at the top, the subtitles in the lower black belt part are easy to see, and the screen position is suddenly switched due to the erroneous determination of the presence or absence of subtitles. Can be prevented.

According to the second or fourth aspect of the present invention, it is determined whether the screen is a standard screen, a landscape screen, or a landscape screen with subtitles in a black belt, and the standard screen, landscape screen, or black belt is determined. After setting the display mode of the standard screen, the display mode of the landscape screen, and the display mode of the landscape screen with subtitles respectively according to the landscape screen with subtitles, The mode transition to the display mode is prohibited. Therefore, even if the presence or absence of subtitles is erroneously determined when the display mode is a landscape screen with subtitles, the screen is not moved, and the subtitles in the lower black band are maintained in an easily viewable state. Also, it is possible to prevent the screen position from suddenly switching due to erroneous determination of the presence or absence of a subtitle.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a television receiver to which the present invention can be applied.

FIG. 2 is a flowchart used to explain an embodiment of the present invention.

FIG. 3 is a schematic diagram used for describing an embodiment of the present invention.

FIG. 4 is a schematic diagram used for describing an embodiment of the present invention.

FIG. 5 is a schematic diagram used for describing an embodiment of the present invention.

FIG. 6 is a schematic diagram used for describing an embodiment of the present invention.

FIG. 7 is a flowchart used to explain another embodiment of the present invention.

FIG. 8 is a state transition diagram used for describing another embodiment of the present invention.

[Description of Signs] 3 ... Controller, 10 ... Wide screen determination circuit, 13 ... Screen setting circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 5/46 H04N 5/46 5/66 5/66 D

Claims (4)

[Claims] A means for determining whether the screen is a standard screen or a landscape screen; a control means for setting a standard screen display mode and a landscape screen display mode according to the standard screen or the landscape screen, respectively; Means for setting an aspect ratio and a display position of a screen according to the above, and in the landscape screen display mode, the screen is arranged so that a black band does not occur above the screen. Display device. 2. A means for determining whether a standard screen, a landscape screen or a landscape screen with subtitles is provided, and a standard screen display mode and a landscape screen display mode according to the standard screen, the landscape screen or the landscape screen with subtitles. Control means for setting the horizontal screen display mode with subtitles respectively, and means for setting the aspect ratio and display position of the screen according to the display mode, the display mode from the horizontal screen display mode with subtitles to the horizontal screen display mode A display device characterized in that mode transition to is prohibited. 3. A step of determining whether the screen is a standard screen or a landscape screen; a step of setting a standard screen display mode and a landscape screen display mode according to the standard screen or the landscape screen, respectively; Setting an aspect ratio and a display position of the screen by using the screen. In the landscape screen display mode, the screen is arranged so that a black band does not occur above the screen. 4. A step of determining whether the screen is a standard screen, a landscape screen, or a landscape screen with subtitles, and a standard screen display mode and a landscape screen display mode according to the standard screen, the landscape screen, or the landscape screen with subtitles. Setting each of a horizontal screen display mode with subtitles and a step of setting an aspect ratio and a display position of a screen according to the display mode, and changing from the horizontal screen display mode with subtitles to the horizontal screen display mode. A display method characterized in that mode transition is prohibited.