JPH03274979A - Picture display device - Google Patents

Abstract

PURPOSE:To display an easy to see picture and to utilize a display screen effectively by converting an inputted 2nd picture signal into a 1st picture signal when the 2nd picture signal is inputted and applying the converted signal to a picture display section. CONSTITUTION:An NTSC system television signal inputted from an input terminal 5 is converted into a digital signal at an A/D converter 6, the result is fed to a picture converter 7, then the television signal whose horizontal scanning period is subject to magnification processing is stored once in a picture memory 9 and interpolation processing in the vertical direction is implemented. A display position on the screen is indicated to a memory control circuit 8 by controlling an operating section 3 to designate a relevant read address to the picture memory 9, the picture data is read and fed to a D/A converter 10. Then the D/A converter 10 applies analog a prescribed to the picture data and the result is fed to a monitor section 4 via a switch 2, then the picture subject to magnification processing is displayed on the display screen.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device that displays images.

[Prior Art] Conventionally, for example, when displaying an image of a television signal of the NTSC system using a television monitor device compliant with a high-definition television system such as high-definition, the NT
By increasing the number of scanning lines of the SC television signal to conform to the high-definition television system and supplying it to the television monitor device, the screen of the television or vision monitor device will display the image shown in Figure 2. On the screen as shown (21 in the figure)
) An image of an NTSC television signal (22 in the figure) was displayed at a predetermined position.

[Problems to be Solved by the Invention] However, in the conventional case described above, due to the difference in aspect ratio between the NTSC system and the high-definition television system,
As shown in FIG. 2, there is a blank area on the screen of the television monitor device where no image is displayed, which is very unsightly, and the display screen of the television monitor device cannot be used effectively.

The present invention has been made to solve the above-mentioned problems.
An object of the present invention is to provide an image display device capable of displaying images in an easy-to-see manner and effectively utilizing a display screen.

[Means for Solving Problem VI] The image display device of the present invention is a device that displays an image corresponding to an image signal, and includes an image display section corresponding to an aspect ratio of a first image signal, and the first When a second image signal having an aspect ratio different from that of the image signal is input, converting the input second image signal into a first image signal,
and an image converting means for supplying the image to the image display section.

[Operation] According to the above-described configuration, two types of images with different aspect ratios can be displayed in an easy-to-see manner, and the display screen can be used effectively.

[Example] Hereinafter, the present invention will be explained using examples of the present invention.

FIG. 1 is a block diagram showing a schematic configuration of an image display device as an embodiment of the present invention.

In FIG. 1, a high-definition television picture is input to the apparatus through an input terminal 1, and an NTSC television signal is input through an input terminal 5.

The operator operates the operation unit 3, and when displaying the image of the high-definition television signal on the monitor part 4, connects the switch 2 to the H side in the figure to display the image of the NTSC television signal. In this case, switch 2 is connected to the N side in the figure.

In addition, when displaying an image of a high-definition television signal, the high-definition television signal is directly supplied to the monitor part 4 via the switch 2, and the high-definition television image is displayed on the monitor part 4.

The display operation of an NTSC television image in this embodiment will be described below.

In FIG. 1, when the operator operates the operating section 3 to display an NTSC television image on the monitor part 4, the switch 2 is connected to the N side in the figure.

An NTSC television signal inputted from the input terminal 5 is converted into a digital signal by the A/D converter 6 and supplied to the image converter 7.

In the image converter 7, in order to make the horizontal scanning period of the digitized NTSC television signal output from the A/D converter 6 correspond to a high-definition television signal, it performs an enlargement process by interpolation and stores the image in the image memory. Supply to 9.

Note that a synchronization signal corresponding to the high-definition television signal is supplied from the memory control circuit 8 to the image converter 7, and the image converter 7 performs the above-mentioned enlargement process according to the synchronization signal output from the memory control circuit 8. is being carried out.

As described above, the television signal subjected to horizontal scanning period expansion processing in the image converter 7 is temporarily stored in the image memory 9.
In the image memory 9, interpolation processing is performed to expand the television signal in the vertical direction in response to the expansion processing of the horizontal scanning period of the television signal performed in the image converter. Ru.

By the way, if the television signal that has been subjected to the above-described vertical enlargement processing on the image memory 9 is displayed as it is on the monitor part 4, the television signal will be distorted due to the aspect ratio of the high-definition television signal. Part of the vertical screen corresponding to the screen disappears.

Therefore, by operating the operation unit 3, the operator instructs the memory control circuit 8 to display the screen display position corresponding to the television signal on the monitor part 4, and the memory control circuit 8
specifies a readout address corresponding to the display position instructed by the operation unit 3 to the image memory 9, reads out the image data stored at the address on the image memory 9, and then outputs the image data to the D/A converter 10. supply to.

The D/A converter 10 converts the image data supplied from the image memory 9 into analog data and supplies it to the monitor part 4 via the switch 2 connected to the N side in the figure. An enlarged image as shown in FIG. 3 is displayed on both sides of the display.

Furthermore, as shown in Fig. 3, by the above-mentioned processing, the conventional NTS
To effectively utilize the display screen of a television monitor device without creating blank areas that occur when displaying an image compatible with C format television signals on a monitor device compliant with high-definition television signals. You will be able to do this.

Another embodiment of the present invention will be described below with reference to FIG.

In FIG. 4, the same components as those in the embodiment shown in FIG. 1 are given the same reference numerals, and detailed explanations will be omitted.

In FIG. 4, when the operator operates the operating unit 11 to display an NTSC television image on the monitor part 4, the switch 2 is connected to the N side in the figure.

The NTSC television signal inputted from the input terminal 5 is converted into a digital signal by the A/D converter 6 and supplied to the image converter 7 and the motion detection circuit 12.

In the image converter 7, in order to make the horizontal scanning period of the digitized NTSC television signal output from the A/D converter 6 correspond to a high-definition television signal, it performs an enlargement process by interpolation and stores the image in the image memory. Supply to 9.

Note that a synchronization signal corresponding to a high-definition television signal is supplied from the memory control circuit 13 to the image converter 7.
The image converter 7 performs the above-mentioned enlargement process in accordance with the synchronization signal output from the memory control circuit 13.

As mentioned above, the television (No. 8) whose horizontal scanning period has been expanded by the image converter 7 is temporarily stored in the image memory 9, and the television whose horizontal scanning period has been expanded by the image converter 7 is Corresponding to the processing for enlarging the horizontal scanning period of the television signal, interpolation processing is performed to enlarge the television signal in the vertical direction.

By the way, in the embodiment shown in FIG. 1 described above, the display position of the screen corresponding to the television signal on a part of the monitor is instructed to the memory control circuit by the operation unit, so that the display position is stored in the image memory. Of the image data,
The configuration is such that specified image data is read out and displayed on a part of the monitor, but in the embodiment shown in FIG. It is configured as a ladder that controls the read address of the image data stored in the image memory 9 so that the large portion is located near the center of the screen.

That is, the digitized television signal output from the A/D converter 6 is supplied to the motion detection circuit 12, and the motion detection circuit 12 compares the screen represented by the supplied digital television signal with the previous screen. And in that screen,
The part with the largest movement is detected and a detection signal is output to the memory control circuit 13.

The memory control circuit 13 specifies a read address for the image memory 9 so that the image data specified by the detection signal supplied from the motion detection circuit 12 is located near the center of the display screen of the monitor part 4, Read the image data stored at the address on the image memory 9, and
/A converter lO.

The D/A converter 10 converts the image data supplied from the image memory 9 into analog data and supplies it to the monitor part 4 via the switch 2 connected to the N side in the figure. On the display screen No. 4, an image is displayed in which the portion of the image with the largest movement is located near the center of the screen.

As described above, in the embodiment shown in FIG. 4, the image is displayed in response to the movement of the image so that the part of the image with the largest movement is located near the center of the display screen of the monitor device. You will be able to do this.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide an image display device that can display images in an easy-to-see manner and make effective use of the display screen.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an image display device as an embodiment of the present invention. FIG. 2 is a diagram showing a display screen of a conventional image display device. FIG. 3 is a diagram showing a display screen of the image display device shown in FIG. 1. FIG. 4 is a block diagram showing a schematic configuration of an image display device as another embodiment of the present invention. 2...Switch, 3.11...Operation unit, 4...
・Monitor part, 6... A/D converter, 7... Image converter, 8.13... Memory control circuit, 9... Image memory, lO... D/A converter, 12...Motion detection circuit.

Claims (1)

[Claims] An apparatus for displaying an image corresponding to an image signal, comprising: an image display section corresponding to an aspect ratio of a first image signal; and a second image display section having an aspect ratio different from the first image signal.
An image display device comprising: an image converter that converts an input second image signal into a first image signal when an image signal is input, and supplies the first image signal to the image display section.