JPH05153514A - Video display device - Google Patents

Abstract

PURPOSE:To prevent title superimposition rearranged on a display screen from giving disturbance onto a video image by displaying fully the video image of a letter box size with the title superimposition onto the display screen in the video display device such as a television receiver provided with the wide aspect display screen whose ratio is 16:9. CONSTITUTION:An A/D converter 1 and a frame memory 2 are used from the video signal of a part of title superimposition to generate digital data thinning scanning lines at a prescribed rate and the digital data are converted into an analog signal by a D/A converter 3 and a high speed switch 4 is used to superimpose the signal onto the desired position of a video signal whose pattern size is converted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver for reproducing a horizontally long image such as a cinemascope size video software on a display surface having a large aspect ratio such as a horizontal to vertical ratio of 16: 9. Video display devices such as.

[0002]

2. Description of the Related Art FIG. 8 (a) shows a display example when cinemascope-sized software with subtitles is reproduced on a display surface having an aspect ratio of 4: 3. The software is called "letterbox size".

As shown in the figure, the cinemascope size software has an empty space at the top and bottom of the image, and shifts the image upwards to a black state below.
There are many cases where subtitles are inserted.

When such software is displayed on a display surface having an aspect ratio of 16: 9, the vertical width is widened and the vertical position is moved to display the image on the full screen in order to effectively use the screen. It is performed that the subtitle supermarket outside the display area is moved into the effective video area and displayed as shown in FIG. 8B.

[0005]

In the conventional image display device, the vertical width is widened to display the effective image area on the entire display surface having the aspect ratio of 16: 9. Therefore, at the same time, the subtitles moved to the effective image area are displayed. There was a problem that the vertical width of the supermarket became wider and occupied a large area in the effective image area, which hindered the viewing of images.

Further, when the subtitle super position is moved by widening the vertical width while maintaining the circularity, an invalid display area is generated vertically as shown in FIG. If a part of the subtitle super may remain and the display quality is unfavorable, the video display position is moved as shown in FIG. 9B so that the original subtitle super does not appear on the screen. There was a need.

The present invention has been made to solve the above problems, and an object thereof is to provide a video display device capable of displaying a subtitle supermarket which is easy to see when reproducing letterbox size video software.

[0008]

A video display device according to the present invention converts a video signal of a subtitle super-portion into digital data by thinning out scanning lines at a desired ratio and converting the digital data into an analog signal. , Superimpose on the desired position of the video signal whose screen size has been changed.

Further, a vertical filter is provided for passing digital data with thinned scan lines.

Further, means for lowering the brightness level of the subtitle super to a predetermined brightness level is provided.

Further, there is provided means for setting the signal portion of the original subtitle supermarket to a predetermined brightness level.

[0012]

According to the present invention, by thinning the scanning lines of the video signal of the subtitle super at a desired ratio, it is possible to compress the vertical width of the subtitle displayed on the display surface to a desired width. ..

Further, since the digital data from which the scanning lines are thinned is passed through the vertical filter, the difference in information between the preceding and succeeding scanning lines is averaged, and the characters of the subtitle superimpose become smooth characters.

Further, since the brightness level of the moved subtitle super is lowered, it becomes easy to see.

Further, the luminance level of the original subtitle is
Since the brightness level is reduced to the same level as the surrounding brightness level, the display quality of the screen is improved.

[0016]

EXAMPLES Example 1. An embodiment of the present invention will be described below. In FIG. 1, 1 is an A / D converter, 2
Is a frame memory, 3 is a D / A converter, 4 is a high-speed switch, and 5 is a controller, which controls the operations of the A / D converter 1, the memory 2, the D / A converter 3, and the high-speed switch 4 to perform the D / A converter. The video signal of the subtitle super output from 3 is superimposed on the lower end of the video signal whose screen size has been changed.

Next, the operation will be described. Of the input video signal, the subtitle superimpose portion is converted into digital data by the A / D converter 1, and once stored in the frame memory 2 as shown in FIG. 2, the subtitle superimpose of the next field will be inserted. To read in the area.

The frame memory 2 is constructed so that writing and reading of data can be performed independently and simultaneously, and when reading data at different positions, the vertical address is skipped, for example, every other address. That is, the width of the subtitle super is compressed by thinning out the scanning lines and reading.

The digital data read out is
It is converted into an analog signal by the D / A converter 3. The controller 5 determines that the brightness data of a certain level or more is caption information, and switches the high-speed switch 4 to the terminal a side only during the period in which the caption super is inserted, and in other periods, the video signal side terminal b side. Switch to and output, and superimpose on the video signal whose screen size has been changed.

In this way, when the letterbox size software with subtitles is displayed on the 16: 9 display surface,
As shown in FIG. 8C, the subtitle super whose vertical width is compressed can be rearranged.

In the first embodiment, the vertical width is compressed by thinning out the scanning lines when reading the subtitle super data from the frame memory 2, but the scanning lines are thinned out when writing the data in the frame memory 2. May be.

In the first embodiment, the dedicated A / D converter 1 and D / A converter 3 are provided. However, in a wide aspect television receiver or the like, the time axis compression circuit or the time axis compression circuit provided in the device is provided. , A / D converter,
Alternatively, the system may share the D / A converter.

Example 2. FIG. 3 is a block circuit diagram of another embodiment of the present invention, and 6 is a vertical filter inserted in front of the D / A converter.

Next, the operation will be described. Frame memory 2
The data read out by thinning out the scanning lines is input to the vertical filter 6 and is input to the D / A converter 3 as data to which the information of the scanning lines adjacent to each other is added.

FIG. 4 is a diagram for explaining a change in the output data of the vertical filter 6, and when attention is paid to the nth scanning line, the information of the original nth scanning line is 1/2, n-1. The information of the 1st and (n + 1) th scanning lines becomes information obtained by adding 1/4 each. As a result, each scan line n-
The discontinuity of the data between the 1st, nth, and n + 1th information, for example, the data in which the step of the character line is improved becomes the data, and the character displayed on the display surface becomes the character written in the smooth line.

Example 3. FIG. 5 is a block circuit diagram showing still another embodiment of the present invention. Reference numeral 7 is a subtractor, 8 is a subtraction value setting device, and in the subtractor 7, the subtitle data read from the frame memory 2 is read. , The value set by the subtraction value setting unit 8 is subtracted from the high-luminance subtitle super data to lower the subtitle super luminance level.

Since the information of one scanning line of the subtitle whose vertical width is compressed by the first or second embodiment increases, line flicker occurs when interlaced scanning is performed. According to the third embodiment, Since the brightness of the subtitle super is lowered, the line flicker becomes less noticeable and the subtitle super is easier to see.

In the third embodiment, when the subtitle super data is read from the frame memory 2, the subtitle super data is subtracted from the frame memory 2. However, when the subtitle super data is written to the frame memory 2, the subtitle super data is subtracted from the subtitle super data. Good.

Example 4. Further, in the third embodiment, the subtractor 7 and the subtraction value setting device 8 constitute means for lowering the brightness level of the subtitle super. However, the structure is not limited to this, and for example, the brightness level is adjusted to a desired brightness level. It may be a means for replacing with a signal.

Example 5. 6 is a block circuit diagram of still another embodiment of the present invention, in which 9 is a field memory and 10 is a field memory.
Is a signal selection circuit, and 11 is a replacement signal generation circuit. In the fifth embodiment, as shown in FIG. 9, when a part of the original subtitle super appears on the screen, the subtitle super is not displayed on the screen.

Next, the operation will be described. Field memory 9
Data is stored only in the period in which the subtitle superimposition is superimposed (hereinafter referred to as "subtitle super period"), and this data is read during the period in which the subtitle super of the video signal of the next field is displayed. It is input to the signal selection circuit 10.

The signal selection circuit 10 is controlled by the control signal input from the controller 5 and is input from the A / D converter 1 only during a period of a certain threshold level or more in the input subtitle super data. The replaced video data is replaced with the subtitle super data, and the original subtitle period data of the video data is replaced with the replacement signal input from the replacement signal generation circuit 11.

Since the replacement signal is set to the signal of the brightness level of the invalid display area such as the black level, the original subtitle super is erased.

Example 6. FIG. 7 is a block circuit diagram of still another embodiment of the present invention, which is a video signal obtained by converting digital data having a screen size changed and a subtitle display position changed into an analog signal by a D / A converter 3. With regard to, the subtitle super in the original subtitle super period is deleted, and the same effect as that of the fifth embodiment can be obtained.

Example 7. Although the fifth and sixth embodiments have described the case where the display position of the subtitle superimpose is moved,
It is also possible to display it in a form of being superimposed on the original subtitle supermarket, and in this case, there is an effect that subtitles without cross color can be displayed.

[0036]

According to the present invention, in a television receiver configured to display letterbox-sized software with a subtitle super in a wide aspect display surface and rearrange subtitles within an effective screen. , Create digital data by thinning out the scanning lines at a desired ratio from the video signal of the subtitle super-part, convert this digital data to an analog signal, and place it at the desired position of the video signal whose screen size has been converted. Since the subtitles are superposed, the vertical width of the subtitles superposed on the display surface can be compressed to a desired width and displayed.

Further, since the vertical filter through which the data of the subtitles with the scanning lines thinned is passed, the subtitles with the compressed vertical width can be displayed as easy-to-read characters without folding or stepping. Is obtained.

Further, since the brightness of the subtitle super in which the vertical width is compressed is lowered, the line flicker in the subtitle superportion is reduced, and the effect of obtaining an easily viewable subtitle super is obtained.

After moving the subtitle supermarket,
Since the original subtitle super is erased, the subtitle super is not displayed twice and an effect of improving the display quality can be obtained.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of the frame memory according to the first embodiment.

FIG. 3 is a block circuit diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the vertical filter according to the second embodiment.

FIG. 5 is a block circuit diagram showing a third embodiment of the present invention.

FIG. 6 is a block circuit diagram showing a fifth embodiment of the present invention.

FIG. 7 is a block circuit diagram showing a sixth embodiment of the present invention.

FIG. 8 shows a display position of a subtitle super and a size of a character when a letterbox size image with a subtitle super according to the conventional example and the present invention is displayed on a 16: 9 wide aspect display surface. It is a figure.

FIG. 9 is a diagram showing a display example of a caption super in another conventional example.

[Explanation of symbols]

 1 A / D converter 2 Frame memory 3 D / A converter 4 High-speed switch 5 Controller 6 Vertical filter 7 Subtractor 8 Subtractor value setter 9 Field memory 10 Signal selection circuit 11 Replacement signal generation circuit

[Procedure amendment]

[Submission date] December 19, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Junichi Shibata No. 1 Baba Institute, Nagaokakyo City, Kyoto Prefecture Mitsubishi Electric Corporation Kyoto Factory

Claims (4)

[Claims] 1. A wide-aspect display surface is projected on a display screen having a smaller aspect ratio by enlarging the vertical width of the video signal to fill the display surface and is superimposed on the video signal. In a video display device configured to display a subtitle super at a desired position on the display surface, means for thinning out scanning lines of video signals of the subtitle superportion at a predetermined ratio to convert into digital data. And a means for D / A converting this digital data and superimposing it on a desired position of the video signal whose screen size has been changed. 2. The image display device according to claim 1, further comprising a vertical filter through which digital data with thinned scanning lines is passed. 3. A video display according to claim 1, further comprising means for lowering, to a predetermined brightness level, a portion having a predetermined brightness level or higher in the video signal of the subtitle superimposing part converted into digital data. apparatus. 4. The video display device according to claim 1, further comprising means for lowering a portion having a predetermined luminance level or more of the original subtitle super-portion to the same level as a surrounding luminance level.