JPH07236100A - Display device - Google Patents

Abstract

PURPOSE:To prevent magnified and displayed subtitles on a slave screen from affecting the subtitles on a master screen even in the case where the subtitles on the slave screen are magnified and displayed within the master screen by making the subtitles within the slave screen be moved to a position not occupied by the subtitles on the master screen within the master screen and be scaled-up and displayed compared with the case where they are displayed within the slave screen. CONSTITUTION:When the picture-in-picture PIP display or the picture-out-picture POP display are performed, a master screen subtitle detection circuit 39 detects the presence of the subtitles in the master screen and outputs a detection signal when there exist the subtitles. A slave screen subtitle moving circuit 36 calculates the position of the master screen subtitles based on the detection signal and adjusts the display position of the slave screen subtitles so that the slave screen subtitles are not overlapped on the master screen subtitles. When the dimensions of the slave screen subtitles are magnified, if the dimensions of the subtitles which can be easily distinguished from those of the master screen is, for example, about a half of the dimensions of the subtitles of the original picture, the magnification is about double of the slave screen and it can be regarded as the compression of the slave screen signal.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a PIP display (or P
The present invention relates to a display device capable of enlarging and displaying a subtitle in a child screen in the case of performing OP display) at an arbitrary position in the main screen where there is no subtitle.

[0002]

2. Description of the Related Art In recent years, the amount of media and the amount of information are increasing very rapidly. However, when various kinds of information are obtained at a time and the information necessary for one's own is selected, the information on the display is displayed at a time. It is convenient to be able to display various information. In addition, there is an increasing demand for viewing one piece of software while viewing another piece of software and other information. In order to satisfy such a demand, a display device equipped with a picture-in-picture (PIP) circuit capable of simultaneously displaying another video (sub-picture) on a part of the video currently viewed (main picture). Is increasing. In addition, a part of the image that is currently being viewed (main screen) is outside the display range, and another image (sub screen)
Can be displayed at the same time.
The number of display devices equipped with P) circuits is also increasing.

Here, when PIP display is performed, the screen size of the child screen is 1/3 or 1/4 of the parent screen.
It is generally compressed to a certain degree. At this time, the subtitles in the child screen are naturally compressed and displayed. Therefore, if the subtitle in the subscreen is a subtitle that spreads over the whole subscreen, you can manage to read the subtitle, but it will be displayed in a part of the screen like the subtitle of a movie, for example. In the case of proper subtitles, it is very difficult to read this subtitle.

This state is shown in FIG. The same figure (a) is an original image, the same figure (b) is the example which carried out PIP display on the screen of aspect ratio 4: 3, and the same figure (c) is 16: aspect ratio.
This is an example of performing POP display in 9. 4 (a) to (c)
As you can see, you can easily read the subtitles on the main screen, but the subtitles on the subscreen are very difficult to read,
Or it is difficult to read.

In order to solve this problem, the present inventor has proposed a method of enlarging and displaying subtitles of a child screen in a parent screen.
Proposed as No. 218331. It should be noted that the term "enlargement" used here means that the subtitles are enlarged and displayed compared to the case where they are displayed in the sub-screen, and the size of the subtitles when the video projected on the sub-screen is projected on the main screen. From the perspective, the subtitles may be reduced. (For example, if the size of the subtitle displayed in the child screen is 1, and the subtitle size of the child screen enlarged and displayed on the parent screen side is 2, 2 is enlarged from the viewpoint of 1. If the size of the subtitle (original size) when the image displayed on the screen is displayed on the parent screen is 3, 2 is reduced when viewed from 3.)

Certainly, if the subtitles in the child screen are enlarged and displayed in the parent screen, it becomes easy to read. However, when the enlarged display position is fixed, the subtitles moved from the child screen may overlap with the original subtitles of the main screen as shown in FIG. 5A, and the original subtitles of the main screen may be difficult to read. It was Further, as shown in FIG. 5B, the display position of the child screen itself may overlap with the original subtitles of the parent screen, and some of the original subtitles of the parent screen may become unreadable.

Here, an example of a conventional PIP circuit will be briefly described. FIG. 6 is a block configuration diagram thereof.

The sub-screen video signal input from the input terminal 1 is separated into a luminance signal Y and a color signal C by a Y / C separation circuit 7. The separated luminance signal is supplied to the vertical filter 8 and L
It is converted into a digital signal by the A / D converter 13 via the PF 10. On the other hand, the color signal is demodulated by the color demodulation circuit 9 into color difference signals RY and BY, and LPF 11 and
It is converted into digital signals in A / D converters 14 and 15 via 12.

The three A / D-converted digital signals are supplied to the PIP decoder 19 via the memories 16, 17 and 18, respectively, and are compressed to 1/3 or 1/4 to be converted into PIP signals. The three PIP signals are converted into analog signals by the D / A converters 20, 21, 22 and supplied to the switching circuit 26 via the LPFs 23, 24, 25. Further, the switching circuit 26 is supplied with signals for the parent screen from the terminals 4, 5 and 6. Then, the switching circuit 26 receives the PIP decoder 19 from the PIP.
The switching operation is performed according to the switching signal supplied in synchronization with the signal timing, and the PIP signal is output. 27,
28 and 29 are output terminals of the switching circuit 26.

A horizontal sync signal (H.SYNC) input terminal 2 and a vertical sync signal (V.SYNC) input terminal 3 are connected to the PIP decoder 19.

Reference numeral 4 is a main screen luminance signal input terminal, 5 is a main screen RY signal input terminal, and 6 is a main screen BY signal input terminal. Supply.

The LPFs 10 to 12 are provided for removing the interference of folding back, and the LPFs 23 to 2 are provided.
Reference numeral 5 is provided for removing the clock from the output signal.

In this way, the PIP signal output from the PIP decoder is inserted by the switching circuit 26 into the parent screen signal coming from the input terminals 4 to 6 and output from the output terminals 27 to 29. .

With the above configuration, the PIP circuit can insert the child screen into the parent screen, and the viewer can watch two different video sources (for example, programs of two different channels) at the same time.

Even in the case of the POP, there is no difference in the circuit from the PIP circuit, and only the display position of the small screen is different. Further, considering a case where a plurality of small screens are provided instead of one screen, when all the small screens are moving images, it is sufficient to have as many PIP circuits as the number of screens. Further, when used for channel search, the memory in the PIP circuit is used to store and output an image for a certain short time by the number of channels.

In the above-mentioned conventional PIP circuit, in order to make the subtitles in the small screen easy to read, the frequency characteristic of the signal of the small screen is widened and the high quality of the small screen is dealt with. On the contrary, due to the increase in the number, aliasing noise increases, which may deteriorate the image quality. Therefore, there is a limit to how easy it is to read subtitles by improving the image quality by widening the band, and as shown in FIG. 4, the subtitles on the sub-screen are inevitably small in display size. It was often difficult.

[0017]

Therefore, as described above, the present inventor has proposed to display the subtitles in the sub-screen in an enlarged manner in the main screen in order to make the subtitles easier to read. As you can see, in the video with subtitles in the main screen,
In some cases, the subtitles on the parent screen and the subtitles enlarged from the subscreen side may overlap, which makes it difficult to distinguish the original subtitles on the parent screen. Furthermore, the display position of the child screen itself may overlap with the original subtitles of the parent screen, and some of the original subtitles of the parent screen may not be readable.

According to the present invention, in order to make the subtitles in the sub-screen easy to read, even when the sub-screens in the sub-screen are enlarged and displayed in the main screen, the enlarged and displayed subtitles do not affect the subtitles originally in the main screen. It is an object of the present invention to provide an apparatus, and further a display apparatus capable of displaying a sub-screen at a position where it does not overlap with the original subtitles of the main screen.

[0019]

In order to solve the above problems, the present invention provides a child screen display circuit for displaying an image-compressed child screen inside or outside a parent screen which is a normal display screen. In a display device having, in the parent screen, a parent screen subtitle detection circuit that detects the presence of the parent screen subtitle in the parent screen and outputs a detection signal, and calculates the position of the parent screen subtitle based on the detection signal, And a sub-screen moving circuit that moves the sub-titles in the sub-screen to a position where the sub-screen does not have sub-screens, and enlarges and displays the moved sub-titles compared to the case where the sub-screens are displayed in the sub-screen. The present invention provides a display device characterized by being provided.

[0020]

(Example) The present invention enlarges and displays the subtitles in the child screen on the parent screen side, and further sets the enlarged display position so as not to overlap the original subtitle position of the parent screen, thereby displaying the enlarged subtitles of the parent screen. This makes it easier to read subtitles and makes them easier to read. Note that, as described above, enlargement refers to enlargement and display of subtitles as compared with the case of displaying in the sub screen, and when the image displayed on the sub screen is displayed on the main screen. Depending on the size of the subtitle, the subtitle may be reduced.

FIG. 1 shows a main part (corresponding to claim 1) of the first embodiment of the present invention. Reference numeral 31 denotes a parent screen video signal input terminal (corresponding to terminals 4 to 6 in FIG. 6), which inserts a sub screen into a video signal coming from this terminal 31 or inserts a sub screen sub signal. .

Reference numeral 32 is a sub-screen video signal input terminal (corresponding to the terminal 1 in FIG. 6), and the video signal coming from the terminal 32 is the same PIP circuit 35 (or POP circuit) as the conventional one.
Is converted into a child screen signal by the switch 37, inserted into the parent screen signal by the switch 37, and output. The PIP circuit 35 corresponds to the blocks 7 to 25 in FIG.
Corresponds to the switch 26 in FIG.

Reference numeral 36 is a sub-screen subtitle moving circuit, which has a function of extracting subtitles in the sub-screen and enlarging and displaying the sub-screen subtitles in a position where there is no subtitle in the main screen (this function). Will be described later). The enlarged sub-picture subtitle signal (Y signal) is displayed on the sub-picture subtitle moving circuit 36.
To the switch 38.

The switch 38 is a sub-screen caption moving circuit 36.
The subtitle signal of the child screen to be enlarged and displayed is inserted into the parent screen by switching according to the control signal supplied from the. Switch 3
The signal output from 8 is supplied from an output terminal 40 to a video display unit (not shown) and displayed.

The display position and display size of the sub-screen and sub-screen subtitles are controlled by the H.SYNC, which comes from the horizontal sync signal (H.SYNC) input terminal 33 and the vertical sync signal (V.SYNC) input terminal 34.
Based on V.SYNC. Further, the detection signal output from the parent screen subtitle detection circuit 39 is also used to control the display position of the child screen subtitle. The parent screen caption detection circuit 39 detects the presence of a caption in the parent screen and outputs a detection signal when there is a caption.

The sub-screen subtitle moving circuit 36 calculates the position of the sub-screen subtitle based on this detection signal and adjusts the display position of the sub-screen subtitle so that the sub-screen subtitle does not overlap the sub-screen subtitle. The display position is adjusted by controlling the switching timing of the switch 38.

An example in which the subtitles (here, OH! Airplane) in the child screen are enlarged and moved according to this embodiment is shown in FIG.
Shown in. In the figure (a), a screen with an aspect ratio of 4: 3 is shown as a PI.
This is an example of P display, and FIG. 2B shows an aspect ratio of 1
This is an example of POP display on a screen of 6: 9. The subtitles of the subscreen are also displayed in the subscreen. The subtitles in the sub-screen are enlarged and displayed in the main screen, making them easy to read.

The example shown in FIG. 3C is an example showing the features of this embodiment. Conventionally, the moved child screen subtitles overlap with the parent screen subtitles as shown in FIG. 5A, but in this embodiment, the position of the parent screen subtitles is detected and the display position of the child screen subtitles is set to the parent position. Since it can be changed to a position where there is no screen subtitle, it is possible to prevent the subscreen subtitle and the parent screen subtitle from overlapping.

Next, the operation of the small screen subtitle moving circuit 36 will be described. First, there is a moving method for moving the subtitles of the child screen to the parent screen side for display, but this may be done by using the method already considered in the subtitle moving circuit. An example of the subtitle moving circuit is shown in FIG. 2 and the operation will be briefly described.

This circuit utilizes the fact that a subtitle can be distinguished from a normal video signal because the subtitle is usually white and the luminance level of the subtitle has the maximum peak value in the screen.
Detects the brightness level of the subtitle and extracts only the subtitle signal,
The caption signal is written in the memory and then read during the video display timing to move the caption.

In FIG. 2, the luminance signal of the sub-picture video signal coming from the input terminal 51 is converted into a digital signal by the A / D converter 55. A pedestal detection circuit 56 performs pedestal detection of the digitized signal.

Based on the pedestal level detected by the detection circuit 56 from the luminance signal, the adder 61 accurately extracts the subtitle portion and writes it in the field memory 57.
The line detection circuit 59 discriminates even and odd fields from the horizontal and vertical synchronization signals input from the input terminals 52 and 53, and detects the timing of writing and reading subtitles. The memory control circuit 60 includes a line detection circuit 5
The memory 57 is controlled on the basis of the timing signal from 9. The memory 57 outputs subtitles according to the read control signal from the memory control circuit 60. The signal is D /
The A converter 62 converts the analog signal and outputs the analog signal. The output of the D / A converter 62 is supplied to the switch circuit 38 shown in FIG. 1, and the switch circuit 38 is switched at the subtitle display timing by the control signal, thereby moving and displaying the subscreen subtitle within the main screen.

Next, the operation of enlarging the size of the small screen subtitle will be described. The operation up to the portion for detecting the subtitle and storing it in the memory 57 is exactly the same as the operation of the moving circuit described above. Here, the minimum value of the subtitle size that can be distinguished from the subtitle of the main screen and is easy for the viewer to read is about 1 of the size of the subtitle of the original image (size when displayed on the main screen).
If it is / 2, the caption of the original signal may be compressed to 1/2. The sub-screen signal is the original signal 1/3 or 1 /
Since it is compressed to about 4, the 1/2 compression of the original signal is about doubled when compared with the sub-picture. This subtitle compression is basically the same as the compression for creating a sub-screen signal, and the subtitle call stored in the field memory 57 can be halved by halving the moving operation described above. . Recalling to 1/2 means, for example, thinning out the original signal to 1/2 and writing it in the memory, or writing the original signal as it is and reading it at the timing of 1/2 of writing.

From the above, the field memory control circuit 60 can be used to increase the size of the subtitle on the sub-screen.
It is sufficient to halve the calling of the memory 57 by. In addition, if you want to reduce the size of the subtitle to 2/3, call 2 /
Set to 3. In this way, the size of the subtitle can be changed in two steps or several steps by making the memory call variable.

Next, the display position control for preventing the subtitles moved from the child screen into the parent screen from overlapping the original subtitles will be described. First, presence / absence of subtitles on the parent screen is checked by the parent screen subtitle detection circuit 39 in FIG. here,
Since the output of the adder 61 shown in FIG. 2 is a caption signal,
This caption signal is used as a detection signal for the presence of captions.
Therefore, the circuit configuration of the parent screen caption detection circuit 39 may be the same as that of the blocks 55, 56, and 11 shown in FIG.
(If you already have a subtitle moving circuit for the main screen,
It is not necessary to newly provide the detection circuit 39. )

In the subtitle moving circuit as shown in FIG. 2, the subtitle moving position (display position) is H.264. SYNC, V.I. SY
It is determined by the line detection of the line detection circuit 59 based on NC. Therefore, in order to change the display position of the subtitle moved to the main screen, a subtitle position detection unit (composed of a microcomputer or the like) of the main screen may be added to the line detection circuit 59 to control the line detection.

The above-mentioned detection signal of the subtitle of the parent screen is supplied to this parent screen subtitle position detecting unit. In the detection unit, V. S
Since H.Y.C. By counting the number of SYNCs, the line in which the detection signal is generated is detected, and the position of the subtitle on the main screen is detected. Next, the line detection circuit 59 determines which line the sub-screen caption signal should be output based on the detected position, and controls the line detection output (timing signal). As a result, even if there are subtitles on the main screen, it is possible to prevent the subscreen subtitles moved to the main screen from being displayed overlapping the subscreen subtitles.
It is possible to provide easier-to-read child screen subtitles regardless of the presence or absence of subtitles on the main screen.

Next, a second embodiment (corresponding to claim 2) will be described. In this embodiment, not only the child screen subtitles to be enlarged and displayed, but also the display position of the child screen itself does not overlap with the display position of the parent screen subtitles.

The second embodiment is the PIP circuit 3 of the first embodiment.
5, a sub-screen subtitle position detection unit (composed of a microcomputer or the like) of the sub-screen similar to that of the first embodiment is added, and a sub-screen detection signal of the sub-screen from the sub-screen subtitle detection circuit 39 is used to detect the subtitle position. Supply to the department. Then, the control signal of the switch 26 (see FIG. 6) by the PIP decoder is changed,
Controls the display position of the inset screen. It should be noted that the position detection signal of the sub-screen position detection unit of the main screen provided in the sub-screen caption moving circuit 36 in the first embodiment may be directly supplied to the PIP decoder.

As described above, in the second embodiment, not only the display position of the sub-screen subtitles but also the display position of the sub-screen itself does not overlap with the display position of the parent-screen subtitles, so that a display screen in which the subtitles are easier to read is provided. Can be provided.

Further, as another embodiment, a subtitle color circuit shown in the previous application of the present inventor (Japanese Patent Application No. 5-96652) is added to control the color of the enlarged subscreen subtitle, The background of the main screen or the subtitles of the main screen and the subtitles of the subscreen may be more clearly distinguished.

[0042]

As described above, the display device according to the present invention has the following effects. (A) The display device according to claim 1 can enlarge and display the subtitles in the sub-screen on the main screen side, and the sub-screen subtitles moved to the main screen side are displayed overlapping the sub-screen subtitles. Since this can be prevented, it is possible to provide easier-to-read subscreen subtitles regardless of the presence or absence of subtitles on the main screen.

(B) In the display device according to the second aspect, not only the display position of the sub-screen subtitles but also the display position of the sub-screen itself does not overlap the display position of the main-screen subtitles.
It is possible to provide a display screen in which subtitles are easier to read.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a main part of a first embodiment.

FIG. 2 is a block configuration diagram of a child screen caption moving circuit according to the embodiment.

FIG. 3 is a diagram showing an example of screen display according to an embodiment.

FIG. 4 is a diagram showing an example of conventional PIP display and POP display.

FIG. 5 is a diagram for explaining a problem when a subtitle in a child screen is enlarged and displayed in a parent screen.

FIG. 6 is a block diagram of a conventional PIP circuit.

[Explanation of symbols]

 31 Main screen video signal input terminal 32 Sub screen video signal input terminal 33 Horizontal sync signal (H.SYNC) input terminal 34 Vertical sync signal (V.SYNC) input terminal 35 PIP circuit 36 Sub screen subtitle moving circuit 37, 38 Switch 39 Main screen subtitle detection circuit

Claims (2)

[Claims] 1. A display device having a child screen display circuit for displaying an image-compressed child screen inside or outside a parent screen, which is a normal display screen, and detecting the presence of a parent screen subtitle in the parent screen. Then, a main screen caption detection circuit that outputs a detection signal, and calculate the position of the main screen caption based on the detection signal,
A sub-screen subtitle that moves the subtitles in the sub-screen to a position in the sub-screen where there is no sub-screen subtitles, and enlarges the moved subtitles when displayed in the sub-screen. A display device comprising a moving circuit. 2. A display device having a child screen display circuit for displaying an image-compressed child screen inside a parent screen, which is a normal display screen, and detecting and detecting the presence of a parent screen subtitle in the parent screen. A main screen subtitle detection circuit that outputs a signal, and calculates the position of the main screen subtitle based on the detection signal,
A sub-screen subtitle that moves the subtitles in the sub-screen to a position in the sub-screen where there is no sub-screen subtitles, and enlarges the moved subtitles when displayed in the sub-screen. A moving circuit is provided, and the child screen display circuit calculates a position of the parent screen subtitle based on the detection signal, and displays the child screen at a position without the parent screen subtitle in the parent screen. Display device.