JPH05137090A - Video output device - Google Patents

Abstract

PURPOSE:To prevent designability in appearance from being impaired by covering a ineffective screen generated when videos with different aspect ratios are displayed on a display means with a movable shielding body. CONSTITUTION:The synchronizing signal of a video signal 17 is fetched out at a synchronizing signal fetching circuit 18, and also, the video signal 17 is inputted to a microcomputer 15, and the microcomputer 15 controls an MDA motor controller 19 by discriminating a video signal with aspect ratio of 16:9 or 4:3 by the video signal and the synchronizing signal fetched at the synchronizing signal fetching circuit 18. Driving control for motors 5a, 5b are performed, and the ineffective screen when a signal with cinema size is displayed on a cathode-ray tube 6 with aspect ratio of 4:3 and the video signal with aspect ratio of 4:3 is displayed on a cathode-ray tube with aspect ratio of 16:9 is covered with the movable shielding bodies 2a, 2b. In such a way, it is possible to cover the ineffective screen generated by the signals with different aspect ratios and to eliminate unpleasantness on the designability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video output device capable of changing the screen size of a television receiver (hereinafter abbreviated as a television) or the like in a design manner according to the aspect ratio of a video signal. It is a thing.

[0002]

2. Description of the Related Art Conventionally, as a publicly known example in which an image whose effective screen is different from the aspect ratio (4: 3) of a standard television image is also displayed, (1) Japanese Patent Laid-Open No. 1-264382 discloses an aspect ratio of 4 : 3 and HDTV 16: 9 tuning, amplification,
It is disclosed that a circuit for demodulating each is provided and the screen is operated by a signal of a selection switch circuit that switches the circuits of these two systems.

(2) In Japanese Laid-Open Patent Publication No. 2-179085, switching between 16: 9 and 4: 3 screens is once converted into analog / digital, and then written in a memory, and then digital / digital.
It is disclosed that the clocks that are converted into analog and are written in the memory are switched to correspond to screens of various aspect ratios, and the movable screen is moved in association with the switch that switches the clocks.

(3) Japanese Patent Laid-Open No. 3-89686 discloses that
By shielding a part of the display screen of the cathode ray tube that displays a plurality of television signals having different aspect ratios with a shielding plate and enlarging the display range of the display screen of this cathode ray tube by the display range enlarging means, It is disclosed that a display boundary line is made invisible even for a television signal having an aspect ratio.

(4) Japanese Patent Laid-Open No. 3-89686 discloses
When displaying an image having a first aspect ratio, an image having a second aspect ratio, and an image having a second aspect ratio on a display screen having a first aspect ratio, an image not related to the image having the second aspect ratio A signal is also supplied to the portion so that an image portion not related to the image of the second aspect ratio is covered while the image of the second aspect ratio is displayed, and the image portion is adjusted by the adjustable cover means while the image of the first aspect ratio is displayed. It is disclosed not to cover.

FIG. 6 and FIG. 7 show an image of an entire size of a television or the like and a video signal when the conventional screen size is changed. Of these, FIG. 6 shows a cinema-size video screen 51 when a cinema-size signal is transferred to a conventional 4: 3 CRT, and the aspect ratio of the video screen is the cinema size, which is bright in the vertical direction of the CRT. An opaque black portion, that is, an ineffective screen 50 is generated.

Further, FIG. 7 shows a video screen 53 when a current video signal having an aspect ratio of 4: 3 is copied on a CRT having an aspect ratio of 16: 9. In the case of FIG. A black ineffective screen 52 appears in the left-right direction of the screen.

[0008]

When such video signals having different aspect ratios are projected on a television screen, an ineffective portion generated on the screen appears as a black portion, which is visually aesthetically pleasing to the viewer. There was a problem that it was not suitable.

The present invention has been made in order to solve the above-mentioned problems, and when a cinema-size image is projected on an existing standard television screen or an aspect ratio of 1
An ineffective screen produced when an image having an aspect ratio of 4: 3 is displayed on a display device of 6: 9, the design can be changed in design to adjust the screen size, and an image output device capable of eliminating discomfort can be obtained. The purpose is to

[0010]

A video output device according to the present invention includes a movable shield for covering a non-effective screen generated when a video signal image is displayed in which the effective screen of the image has a different aspect ratio.
A drive unit for driving the movable shield, a determination unit for determining at least the aspect ratio and cinema size information included in the video signal, and a drive control unit for controlling the drive of the drive unit based on the determination result of the determination unit. It is provided.

[0011]

The discriminating means according to the present invention discriminates at least the aspect ratio and the cinema size information contained in the video signal, and controls the drive control means according to the result of the discrimination. The drive control means controls the video by the discriminating means. The drive means is controlled according to the result of the discrimination between the signal and the cinema size information, and under the control, the movable shield automatically shields the ineffective screen of the display means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a video output device of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a cathode ray tube and its peripheral portion of a television receiver to which the embodiment is applied. Although FIG. 1 illustrates the case where the cathode ray tube 6 is used as the display means, the present invention may be a liquid crystal display device other than the cathode ray tube 6 as a matter of course. In the following description, for convenience of description, a case where the cathode ray tube 6 is used will be described as an example.

In FIG. 1, reference numeral 1 denotes a housing of a television receiver, which is opened in the central portion of the front surface of the housing 1 to expose the display surface of a cathode ray tube 6 so that an image can be displayed. In the upper and lower portions and the left and right portions of the cathode ray tube 6, ineffective screens that occur when displaying with different aspect ratios are covered with the movable shields 2a and 2b.

That is, in the "Prior Art" section, when a cinema size image is displayed on the CRT 6 having an aspect ratio of 4: 3, as described with reference to FIGS.
As shown in FIG. 6, strip-shaped ineffective screens appear on the upper and lower portions of the display surface of the cathode ray tube 6 and become black. Also, as shown in FIG. 7, a 4: 3 image is displayed on a cathode ray tube having an aspect ratio of 16: 9. When is displayed, an ineffective screen appears on both the left and right sides of the display surface of the cathode-ray tube and the screen becomes black.

The ineffective screen generated on the upper and lower portions of the display surface of the cathode ray tube 6 and on both the left and right sides of the cathode ray tube 6 is moved by the movable shield 2.
It is adapted to be covered with a and 2b. The movable shields 2a and 2b are formed in a sheet shape made of a flexible material, and when the ineffective screen of the display screen of the cathode ray tube 6 is covered,
Design consideration is given so that the color of the front part of the housing 1 is not significantly different from the color of the front part.

The end edges of the movable shields 2a and 2b are shown in FIG.
As is apparent from the above, the cathode ray tube 6 is located at the boundary between the non-effective screen portion and the effective screen portion of the display screen, but the other ends are respectively located at the reels 3a and 3b.
It is wound around. Although not shown, a reel is connected to the reels 3a and 3b coaxially with the reels 3a and 3b. Rubber belts 4a and 4b are stretched between the pulleys and the rotating shafts of the motors 5a and 5b, respectively.
Thus, the motors 5a and 5b, the rubber belts 4a and 4b,
Movable shields 2a, 3d by pulleys and reels 3a, 3b
2b constitutes a driving means.

The rubber belts 4a and 4b, the pulley and the reel 3 are driven by driving the motors 5a and 5b.
The movable shields 2a and 2b move via a and 3b, and can follow the design according to the aspect ratio. Considering FIG. 1 as a side view, it corresponds to the cinema size of FIG. 6, and considering it as a top view corresponds to FIG. 7.

Next, the drive control of the drive means and the system of the drive control means and the determination means for detecting and determining the aspect ratio and cinema size information contained in the video signal will be described with reference to FIG. FIG. 2 is a block diagram showing the system of the discriminating means and the drive control means, and 17 in the figure is a video signal.
7 is input to the microcomputer 15, and the sync signal extraction circuit 18 extracts the sync signal contained in the video signal 17. The microcomputer 15 and the sync signal extracting circuit 18 constitute a discriminating means for discriminating at least the aspect ratio and the cinema size information contained in the video signal 17.

The synchronization signal extracted by the synchronization signal extraction circuit 18 is sent to the microcomputer 15, and the output of the microcomputer 15 causes
The data is sent to the MDA motor controller 19 as drive control means.

Next, the operation will be described. 3A and 3B are waveform charts for explaining this operation. FIG. 3A shows a cinema size signal and FIG. 3B shows a normal NTSC television signal. The cinema size signal in FIG. 3A is also N
Although it is a TSC TV signal, the video level in the upper and lower parts of the screen is pedestal and the screen does not illuminate. That is,
In the normal NTSC television signal of FIG. 3B, 17H (1H = 6) from the falling edge of the vertical synchronization signal 11.
Although there is a video signal 12 of video after 3.5 μsec), since it is adjusted to the aspect ratio of the cinema size as shown in FIG. 12 does not come. Therefore, the microcomputer 15 detects the delay of the video signal 12 and discriminates it from the NTSC television signal, controls the MDA motor controller 19 according to the discrimination result, and displays the NTSC television signal on the motors 5a and 5b. The drive of the motors 5a and 5b is controlled so as to correspond to.

Next, the drive sequence of the movable shields 2a and 2b when displaying the cinema size information on the cathode ray tube 6 will be described with reference to the flowchart of FIG. First, in step S30, the microcomputer 15 clears the A register. A register is currently movable shield 2
It is a flag indicating how a and 2b are set. If the size is matched to the cinema size, A = 1, normal NTS
In the case of a C system television signal, A = 0.

This is the case of a normal NTSC television signal, and the process proceeds from step S30 to step S31, and in step S31, the synchronizing signal extracting circuit 18
The sync signal is read in and the vertical signal 11 is detected in step S32.

Next, in step S33, 20H is counted from the vertical synchronizing signal 11, and in step S34, the subsequent video signals are read. After this reading and step S35, it is determined whether or not the video signal is a pedestal signal continuously for 20H thereafter, and if the result of the determination is a pedestal, step S3.
From the YES side of step 5, the process proceeds to step S36, it is determined that the size is a cinema size (A = 1), and in step S37 the MDA controls the controller 19 to drive the motors 5a and 5b. After that, if it is in cinema size, step S3
At 8 the register A is set to A = 1.

In addition, as a result of the determination in step S35, when the current cinema size is set, the normal NTSC
When the size is changed to the display size of the television signal of the system, the process proceeds from the NO side of step S35 to step S39 in the same manner as described above, and when the size is adjusted to the cinema size in step S39 (A = 1), the step In S40, the microcomputer 15 controls the MDA controller 19, and the MDA controller 19 controls the motor 5 based on the control.
The drive control of a, 5b is driven, A is set to 0 in step S41, the motors 5a, 5b are driven, and the movable shield plates 2a,
A design corresponding to the original aspect ratio of 2b, that is,
The non-effective screen above and below the display surface of the cathode ray tube 6 is covered so as to adapt to the information display of the cinema size.

Next, in accordance with the flow chart of FIG. 4, a CRT having an aspect ratio of 16: 9 is provided with an aspect ratio of 4: 3.
The processing procedure of the microcomputer 15 in the case of capturing the video signal of will be described. Since the horizontal synchronizing signal 10 of the aspect ratio 4: 3 is 63.5 μsec, the aspect ratio 4: 3 or the aspect ratio 16: 9 is discriminated depending on whether or not it is 63.5 μsec to drive the motors 5a and 5b. I am trying to do it.

That is, step S20 in FIG.
Then, the sync signal is read out by the sync signal extraction circuit 18,
In step S21, the microcomputer 15 determines in step S21 whether the read sync signal is 63.5 μsec. If the result of the determination is 63.5 μsec, the microcomputer 15 determines in step S22 that the MDA motor controller 22
The MDA motor controller 19 controls the driving of the motors 5a and 5b so as to match the image display with the aspect ratio of 4: 3, and when the signal becomes the aspect ratio of 16: 9, the MDA motor controller 19 moves. The shields 2a and 2b cover the non-effective screens on the left and right sides of the screen when an image display with an aspect ratio of 4: 3 is shown so as to match the design.

Then, in step S23, the video signal is set to 1
When the aspect ratio becomes 6: 9, that is, when the sync signal read by the sync signal extracting circuit 18 is not the horizontal sync signal 63.5 μsec, NO in step S23.
From the side to step S24, the microcomputer 1
5 controls the MDA motor controller 19, and accordingly, the MDA motor controller 19 drives the motor 5
Drive control of a and 5b is performed to move the movable shields 2a and 2b to restore the design of the display surface of the tele receiver.

[0028]

As described above, according to the present invention, the discriminating means discriminates at least the aspect ratio and the cinema size information contained in the video signal, and the drive control means is controlled in accordance with the discriminating result to drive. Since the control means controls the drive of the drive means to control the movable shield, when a cinema size image is projected on the current standard television screen, or on the display means with an aspect ratio of 16: 9. When an image with an aspect ratio of 4: 3 is displayed, each ineffective screen is automatically covered with a movable shield, and the appearance of the design around the display screen is not impaired, eliminating visual discomfort. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a cathode ray tube and its peripheral portion of a television receiver to which an image output device according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram of a discrimination means and a discrimination control means in the above embodiment.

FIG. 3 is a video signal waveform diagram for explaining the operation of the above embodiment.

FIG. 4 is a flowchart showing a processing procedure when a video signal is displayed on a display unit having an aspect ratio of 16: 9 in the same embodiment.

FIG. 5 is a flowchart showing a processing procedure for displaying a video of cinema size information on a display unit having an aspect ratio of 4: 3 in the same embodiment.

FIG. 6 is an explanatory diagram of a case where a cinema size image is displayed on a conventional CRT having an aspect ratio of 4: 3.

FIG. 7 is an explanatory diagram for displaying an image having an aspect ratio of 4: 3 on a conventional CRT having an aspect ratio of 16: 9.

[Explanation of symbols]

 1 Housing 2a Movable Shield 2b Movable Shield 3a Reel 3b Reel 4a Rubber Belt 4b Rubber Belt 5a Motor 5b Motor 6 Braun Tube 15 Microcomputer 18 Synchronous Signal Extraction Circuit 19 MDA Motor Controller

Claims (1)

[Claims] 1. A discriminating means for discriminating at least an aspect ratio and cinema size information contained in a video signal,
When a video signal different from the aspect ratio of the display means is displayed, a movable shield which covers the ineffective screen generated on the display means, a drive means for driving the movable shield, and a determination result of the determination means are provided. And a drive control means for controlling the drive of the drive means so that the ineffective screen generated on the display means is covered with the movable shield.