JP2003032570A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device that automatically displays a squeezed (compressed) video signal with an aspect ratio of 4:3 fully on a display screen whose aspect ratio is 16:9. SOLUTION: A 2nd changeover circuit 7 receives a luminance signal of each input system and is switched by a control section 10 in matching with the selection by a signal selection button 9c. A signal detection section 8 detects a black level signal at a left end and a right end of a display video image from a luminance signal of the 2nd changeover circuit 7. When the detection section 8 detects the black level signal, the control section 10 makes a sealer section 5 apply magnification processing to a video signal with an aspect ratio of 16:9 in a horizontal direction. Through the processing, a display section 6 can automatically display a video image in the absence of left and right black levels fully on the screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device, and more particularly to a video display device for enlarging a video signal having an aspect ratio of 4: 3 to a display unit having an aspect ratio of 16: 9.

[0002]

2. Description of the Related Art Currently, there are various types of video signals, and among them, as a relatively new one,
There is a signal of "squeezed (compressed) 4: 3 video" (hereinafter referred to as "squeeze video signal"). This squeeze video signal was broadcasted at the end of 2000
This video signal is used in digital broadcasting and the like, and is a video signal in which the horizontal direction is compressed to have an aspect ratio of 4: 3 and a predetermined width on the left and right is a black signal. The signal form is also a composite form in which the luminance signal and the color signal are combined, a separate form (S terminal form) including the luminance signal Ys and the color signal Cs, and a component including the luminance signal Yc and the color signals Pb and Pr. Form, R (red) and G (green) and B
(Blue) and RGB form. On the other hand, display screens having an aspect ratio of 16: 9 are becoming widespread in television receivers, display monitors and the like. 2A and 2B show a conventional example in which the squeeze video signal is displayed on the display screen (16: 9).

In the figure, 21 is an aspect ratio X: Y =
The display screen of 16: 9 is shown. Further, as shown in the figure, the display image is one in which perfect circles 22 and 23 are arranged at the central portion and at the upper, lower, left and right corners. Further, FIG. 9A shows a case where the squeeze video signal is displayed on the 16: 9 display screen without displaying the image having the aspect ratio of 4: 3 (widening). In the case of this display, as shown in the figure, there are black areas 24 on the left and right of the displayed image, and there is a non-image area 25 outside thereof, and x1: Y = 4: 3. Due to such a display, the center portion and the circles at the respective corners are displayed in a vertically long ellipse. On the other hand, FIG. 6B is an image in which the horizontal direction is enlarged and the non-image area 25 in FIG. In this case, x2: Y = 4: 3, and circle 2 at the center and each corner
2 and 23 are perfect circles and are displayed properly, but black areas 24 are left and right. Note that the horizontal enlargement for displaying the display of FIG.

[0004]

As described above, the conventional display form of the squeeze video signal is mainly shown in FIG. 2A or 2B, and the video portion is not displayed on the full screen. There wasn't. Further, also in the case of displaying as shown in FIG. 2B, it is necessary to manually perform the horizontal enlargement operation. In view of such a point, an object of the present invention is to display a squeeze video signal on a full display screen with an aspect ratio of 16: 9, and to provide a video display device in which the enlargement process is automated.

[0005]

To achieve the above object, according to the present invention, a plurality of types of video signals having a video aspect ratio of 4: 3 are input, predetermined signal processing is performed on the input video signal, and a desired signal is obtained. Display aspect ratio is 1 by switching and selecting signals
In a video display device for displaying on a 6-to-9 screen, a signal type detection unit for detecting a black signal at the left and right ends of a display video, a scaler unit for processing a video signal so as to expand a display aspect ratio, A control unit for controlling the signal type detection unit and the scaler unit is provided, and when the signal type detection unit detects the black signal, the scaler unit enlarges the video signal so as to display with an aspect ratio of 16: 9. The present invention provides a video display device that does.

Further, the detection in the signal type detecting section is
Detect based on the luminance signal.

Further, the enlargement processing in the scaler portion is performed so as to be uniformly enlarged from the central portion of the screen to the left and right edges.

Alternatively, the enlargement processing in the scaler portion is performed such that the enlargement is performed from the center of the screen to the left and right ends.

Alternatively, an operating section provided with a wide mode changeover switch is provided, and by the switch, the enlargement processing in the scaler section is processed so as to be uniformly enlarged from the central portion of the screen to the left and right edges or from the central portion of the screen to the left and right edges. Set it to one of the processes so that it expands greatly.

Further, an operation section having an automatic processing on / off switch is provided, and the enlargement processing is set to be activated or deactivated by the switch.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings based on examples. FIG. 1 is a block diagram of essential parts showing an embodiment of a video display device according to the present invention. The present embodiment is intended for a squeeze video signal having a video aspect ratio of 4: 3 and other video signals, and does not include a video signal of 16: 9. As shown in the figure, the form of the input signal is a composite signal (Vc) in which a luminance signal and a color signal are combined, a separate signal (S terminal form) including a luminance signal Ys and a color signal Cs, and a luminance signal Yc. Component signal composed of color signals Pb and Pr, R (red) and G (green) and B
(Blue) and RGB signals. In the figure, 1
Is a Y / C separation unit, which converts the composite signal Vc to a luminance signal.
Separated into Ya and color signal Ca. 2 is a demodulation unit, Y / C
A luminance signal Y and color difference signals U and V are output from the luminance signal Ya and the color signal Ca from the separation unit 1 or the luminance signal Ys and the color signal Cs of the separate signals. Reference numeral 3 denotes a matrix portion, which is a luminance signal Y from the demodulation portion 2 and color difference signals U and V, or a luminance signal Yc of component signals and color signals Pb and Pr from R and G,
While outputting the B signal, the luminance signal from the input RGB signal
Generate Yb (inverse matrix). A first switching circuit (SW-1) 4 switches between R, G, B signals from the matrix section 3 and input RGB signals.

Reference numeral 5 is a scaler section for enlarging the horizontal display. Specifically, it is a process of increasing the number of pixels, and as a processing method thereof, for example, pixel data located in the middle is generated from each pixel before and after, and this generation is performed for a required number of pixels. 6 is a display unit with an aspect ratio of 16: 9,
The RGB signal from the scaler unit 5 is displayed. 7 is the second
Is a switching circuit (SW-2) for the luminance signal Y of each input system.
A, Ys, Yb, and Yc are switched according to the signal displayed on the display unit 6. A signal type detection unit 8 detects whether or not the signal from the second switching circuit 7 is a squeeze video signal based on the presence or absence of a black signal on the left and right sides in the horizontal direction. An operation unit 9 is an automatic enlargement on / off switch (SW) 9a which is turned on when automatically performing horizontal enlargement processing when the video signal to be displayed is a squeeze video signal, and a horizontal enlargement processing mode. And a signal selection button 9c for selecting a signal to be displayed. Reference numeral 10 denotes a control unit, which is based on the Y / C separation of the Y / C separation unit 1 and the selection by the signal selection button 9c of the operation unit 9, the demodulation unit 2, the matrix unit 3, the first switching circuit 4, and the second switching unit. Signal switching of the circuit 7, automatic enlargement on / off switch 9a or wide mode switching switch 9b of the operation unit 9
Of the scaler unit 5 based on the operation of the
Control the detection of.

In the above configuration, the input video signal of a certain system is the squeeze video signal, and the signal is displayed on the display unit 6.
When the signal selection button 9c is selected to display, the luminance signal is input to the signal type detection unit 8 from the second switching circuit 7. The signal type detection unit 8 detects black signals on the left and right sides in the horizontal direction from the luminance signal. Here, when the automatic enlargement on / off switch 9a is turned on, the control unit 10 causes the scaler unit 5 to enlarge the horizontal display. The mode of the enlargement processing is the wide mode switch
Follow 9b settings. An example of this mode of enlargement processing is shown in FIG.
Shown in (C) and (D). In FIG. 2C, the central area of the screen is expanded less, and the processing is performed so that the central area is expanded toward the left and right ends. In the case of this processing, horizontal linearity near the center of the screen is maintained, and a display with less discomfort can be obtained. On the other hand, in FIG. 2D, the enlargement process is performed uniformly in the entire horizontal direction. In the case of this processing, the vicinity of the center of the screen is also enlarged, but it is suitable for displaying characters and the like with little discomfort even if the aspect ratio is broken. Also, FIG.
Both (C) and (D) have no left and right black bands, and the entire screen is displayed, so that the feeling of power can be increased.

[0014]

As described above, according to the present invention, the squeezed 4: 3 video signal is enlarged and displayed on the full 16: 9 display screen. In addition, the enlarged display is also automatically performed by detecting the signal type, which provides convenience to the user.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing an embodiment of a video display device according to the present invention.

FIG. 2 is an explanatory diagram of horizontal enlargement processing.

[Explanation of symbols]

1 Y / C separation section 2 demodulator 3 Matrix part 4 First switching circuit 5 Scaler section 6 Display 7 Second switching circuit 8 Signal type detector 9 Operation part 9a Automatic enlargement on / off switch 9b Wide mode switch 9c Signal selection button 10 Control unit

Claims (6)

[Claims] 1. A plurality of types of video signals having a video aspect ratio of 4: 3 are input, predetermined signal processing is performed on the input video signals, and desired signals are switched and selected to have a display aspect ratio of 16: 9. In the video display device displayed on the screen,
A signal type detection unit that detects black signals at the left and right ends of a display image, a scaler unit that processes a video signal so as to increase the display aspect ratio, and a control unit that controls the signal type detection unit and the scaler unit. And a video display device for enlarging the video signal so that the scaler unit displays the image with an aspect ratio of 16: 9 when the signal type detection unit detects the black signal. 2. The video display device according to claim 1, wherein the detection by the signal type detection unit is detected based on a luminance signal. 3. The enlarging process in the scaler unit,
The image display device according to claim 1, wherein the image display device is processed so as to be uniformly enlarged from the central portion of the screen to the left and right edges. 4. The enlarging process in the scaler section,
The image display device according to claim 1, wherein the image display device is so processed as to be enlarged as it goes from the center of the screen to the left and right ends. 5. An operating section provided with a wide mode changeover switch is provided, and by the switch, the enlargement processing in the scaler section is processed so as to be uniformly enlarged from the central portion of the screen to the left and right edges or from the central portion of the screen to the left and right edges. 2. The image display device according to claim 1, wherein one of the processes is set so that the image is enlarged as much as possible. 6. The image display device according to claim 1, further comprising: an operation section provided with an automatic processing on / off switch, wherein the enlargement processing is set to be activated or deactivated by the switch.