JPH06292099A - Display device - Google Patents

Abstract

PURPOSE:To obtain a display device in which a title in a slave picture is moved in a master picture and displayed in magnification and a color of a title of a slave picture displayed in magnification is controlled when a picture-in-picture display or a picture-out-picture display is performed. CONSTITUTION:A slave picture title moving circuit 40 extracts a title from a video signal for a slave picture and decides the size of the title and a display position in a master picture to execute processing and gives the processed title to a switch 44. The switch 44 is used to insert the title to a video signal for the master picture in response to a control signal from the slave picture title moving circuit 40. Moreover, a character chroma circuit 41 controls the color of the slave picture title displayed in magnification.

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 moving subtitles in a child screen in the case of performing (OP display) to a parent screen to enlarge and display the subtitles of the child screen moved to the parent screen in color.

[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 is a subtitle that spreads over the entire sub screen, the subtitle can be read, but in the case of a subtitle that is displayed on a part of the screen, such as a movie subtitle. It will be 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. The state of the enlarged display is shown in FIGS. 5 (a), 5 (b), 6 (a), and 6 (b). In addition,
Enlarging here means displaying the subtitles by enlarging it compared to the case of displaying it in the sub screen, and you can see it from the size of the subtitle when the image displayed on the sub screen is displayed on the main screen. For example, the subtitles are reduced. (For example, if the size of the subtitle displayed in the subscreen is 1, the subtitle in the subscreen enlarged and displayed on the main screen side has a size of 2 (enlarged when viewed from 1). The size (original size) of the subtitle when the original image is displayed on the main screen is 3 (2 is reduced when viewed from 3).

As shown in FIGS. 5 (a) and 5 (b), the subtitles in the child screen are enlarged and displayed in the parent screen, so that they are easy to read. However, as shown in FIG. 6A, when the subtitle moved from the child screen is close to the original subtitle of the main screen, it may be difficult to determine which subtitle it is. Further, FIG. 6B is an example of a case where the subtitles are moved so that they are not close to each other (or moved to a place where they do not interfere with the image on the main screen), but since the subtitles are usually white, they are moved. If the background of the part's parent screen is white, the subtitles will merge into the background. Therefore, also in this case, the subtitles are very difficult to read or difficult to read.

Here, an example of the PIP circuit will be briefly described. FIG. 7 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.

As described above, the PIP signal output from the PIP decoder is inserted by the switching circuit 26 into the signal for the parent screen coming from the input terminals 4 to 6, and the output terminal 2
It is output from 7 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 due to the wide band, and as shown in FIG. 4, the subtitles on the sub-screen become very difficult to read or difficult to read. There were many

Therefore, as described above, the present inventor has proposed to display the subtitles in the child screen in an enlarged manner in the parent screen in order to solve the above problem. In a video with subtitles, when the subtitles of the main screen and the subscreens enlarged from the subscreen overlap or come close to each other, it may be difficult to determine which subtitle is the subtitle. Furthermore, when the display position of the subtitle on the sub-screen is moved within the main screen, the subtitle is usually white. Therefore, if the video on the main screen in the moved part is white, the subtitle and the background can be distinguished. It could be difficult to read.

[0018]

The problem to be solved by the present invention is to make the subtitles in the sub-screen easy to read.
In order to prevent the enlarged subtitles from being affected by the background of the main screen even when the subtitles of the subscreen are enlarged in the main screen, and to make it easy to distinguish from the subtitles of the main screen. The question is what kind of measures should be taken.

[0019]

In order to solve the above problems, the present invention provides

In a display device having a child screen display function for displaying an image-compressed child screen inside or outside a parent screen which is a normal display screen,

A sub-screen subtitle moving circuit for enlarging and displaying subtitles in the sub-screen on the main screen,

A subtitle color circuit for displaying in color the subtitles moved by the sub-screen subtitle moving circuit is provided.

[0023]

(Example) The present invention enlarges and displays the subtitles in the child screen on the main screen side, and further, by colorizing the enlarged and displayed subtitles, the background of the subtitles and the main screen and the subtitles of the main screen and the enlarged display. 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. From the size of the subtitle, the subtitle is reduced.

FIG. 1 shows the essential part of one embodiment of the present invention. Three
Reference numerals 1a to 31c are parent screen video signal input terminals for inserting a sub screen to a video signal coming from these terminals 31a to 31c or inserting a sub screen sub signal. Also,
By replacing the signal corresponding to the child screen subtitle display portion of the parent screen color difference signals (RY, BY) coming from the parent screen color signal input terminals 37, 38 with the signal output from the character chroma circuit 41, Performs color control of the screen caption signal.

Reference numeral 32 is a sub-screen video signal input terminal. The video signal coming from the terminal 32 is converted into a sub-screen signal by the PIP circuit 39 (or POP circuit) similar to the conventional one, and converted into a main screen signal. It is inserted and output. Reference numeral 40 denotes a sub-screen subtitle moving circuit, which has a function of extracting subtitles in the sub-screen and enlarging and displaying them on the main screen side (this function will be described later). The enlarged sub-picture subtitle signal (Y signal) is output from the sub-picture subtitle moving circuit 40 to the switch 44. The horizontal sync signal (H.SYNC) controls the display position and display size of the sub screen and sub screen subtitles.
This is performed based on H.SYNC and V.SYNC coming from the input terminal 33 and the vertical synchronizing signal (V.SYNC) input terminal 34.

The switch 44 is a sub-screen caption moving circuit 40.
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 4
The signal output from the No. 4 is supplied from the output terminal 47 to the video display unit (not shown) and displayed.

The character chroma circuit 41 includes a color control terminal 35 and a color gain control terminal 36.
Color signals (here, R, G, B signals) are generated from two control signals supplied from To the color control terminal 35, a control signal for changing the color of the sub-screen subtitle (subsequently the subtitle after moving) according to the color of the moving destination part of the sub-screen subtitle in the main screen comes from the microcomputer or the like. A control signal for controlling the color intensity of the sub-screen subtitles is input to the color gain control terminal 36 from a microcomputer or the like. Then, the character chroma circuit 41 outputs the generated color signal to the matrix circuit 42 according to the control signal supplied from the sub-screen caption moving circuit 40, and the output color signal is converted into a color difference signal and the switch circuits 45 and 46. Is supplied to.

The switches 45 and 46 are switched according to the control signal supplied from the sub-screen caption moving circuit 40, and the signal generated by the character chroma circuit 41 is output from the PIP circuit 39. And output to terminals 48 and 49. Terminal 48,
The color difference signal output from the image display unit 49 (not shown)
Is supplied to.

The operation of the character chroma circuit 41 will be described with reference to the block diagram of FIG.

A control signal is supplied to the character chroma circuit 41 from the sub-screen subtitle moving circuit 40. The sub-screen subtitle signal may be used as this control signal. The switch circuit 65 outputs the color signal generated by the color signal generation circuit 64 at the timing of the sub-screen caption signal according to the control signal. Here, the color signals generated by the color signal generation circuit 64 are R, G, B signals as an example, but they may be composite signals or color difference signals.

In this way, in this embodiment, since the color control of the sub-screen subtitles enlarged and displayed in the main screen can be performed, by changing the color of the sub-screen subtitles according to the color of the subtitles originally in the main screen. , Even when the sub-screen subtitle is enlarged and displayed close to the sub-screen subtitle (in the case of FIG. 6A),
It is easy to distinguish from the subtitles on the main screen, and subtitles that are easy to read can be displayed. Further, even when the display position of the sub-screen subtitle is moved to the background portion in the main screen and the background of the main screen at the moving position is white (in the case of FIG. 6B), the present embodiment is not limited to the sub-screen subtitle. By the color control of, the distinction between the sub-screen subtitles and the background is clear and the display is easy to read.

FIG. 5 shows an example in which the subtitles in the sub-screen are enlarged and moved according to the present embodiment. The same figure (a)
Shows an example in which PIP display is performed on a screen with an aspect ratio of 4: 3. In the same figure (b), PO is displayed on a screen with an aspect ratio of 16: 9.
This is an example of P display. 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, and the sub-screen subtitles are color-controlled.

Next, the operation of the small screen subtitle moving circuit 40 will be briefly 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 caption can be distinguished from a normal video signal because the caption is normally white and the brightness level of the caption 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 44 shown in FIG. 1, and the switch circuit 44 is switched at the subtitle display timing by the control signal, thereby moving and displaying the subscreen subtitle in the main screen.

Next, the operation of enlarging the size of the subtitle on the child screen 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, it can be distinguished from the subtitle of the main screen, and
If the minimum size of the subtitles that can be easily read by the viewer is about 1/2 of the size of the subtitle of the original image (size when displayed on the parent screen), the subtitle of the original signal is 1/2 You just have to compress it. The sub-screen signal is 1/3 or 1 of the original signal.
Since it is compressed to about / 4, 1/2 compression of the original signal is expanded about twice when compared with the sub-screen. 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. . To halve a call means, for example, that the original signal is 1
That is, it is thinned out to / 2 and written in the memory, or the original signal is written as it is and read at a timing of 1/2 of writing.

From the above, in order to increase the size of the subtitle on the sub-screen, the field memory control circuit 60 can be used.
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 variable display position of the subtitle moved from the child screen to the parent screen will be described. In the caption moving circuit described above, the H. SYNC, V.I. The position is determined by the line detection of the line detection circuit based on SYNC. Therefore, in order to make the display position of the subtitle moved to the main screen variable, the line detection of the line detection circuit 59 may be controlled from the outside by a microcomputer or the like. Therefore, the display position of the moved subtitle can be easily changed, and the subtitle can be displayed at a position where it does not disturb the original image of the main screen.

In the above embodiment, the color signal output of the PIP circuit 39 is described as a color difference signal, but R, G, B signals may be used. In this case, the matrix circuit 42 may be omitted and the color control of the sub-screen subtitles may be performed by color signals in the form of R, G, B signals. Further, the video signal input for the parent screen and the child screen may be R, G, B signals.

[0041]

As described above, in the display device according to the present invention, the subtitles in the sub-screen can be enlarged and displayed on the main screen side, and color control of the enlarged and displayed sub-screen subtitles can be performed. The displayed sub-screen subtitles and the background of the main screen or the sub-screens of the main screen are clearly distinguished, and the sub-screen subtitles that are easier to read can be displayed.

[Brief description of drawings]

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

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

FIG. 3 is a block configuration diagram of a character chroma circuit of the embodiment.

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

FIG. 5 is a diagram showing an example in which subtitles in a child screen are enlarged and displayed in a parent screen.

FIG. 6 is a diagram for explaining a problem when subtitles in a child screen are enlarged and displayed in a parent screen.

FIG. 7 is a block configuration diagram of a conventional PIP circuit.

[Explanation of symbols]

 31a to 31c 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 Color control control signal input terminal 36 Color gain Control control signal input terminal 39 PIP circuit 40 Sub-screen caption moving circuit 41 Character chroma circuit

Claims (1)

[Claims] 1. A display device having a child screen display function for displaying an image-compressed child screen inside or outside of a parent screen which is a normal display screen, wherein subtitles in the child screen are displayed on the parent screen. A display device comprising: a sub-screen subtitle moving circuit for enlarging and displaying the sub-screen; and a subtitle color circuit for displaying subtitles moved by the sub-screen subtitle moving circuit in color.