JPS62263781A - High definition television receiver - Google Patents

Abstract

PURPOSE:To effectively use a display by projecting the video of other channel of an existing standard television broadcasting and the video of a high definition television system on the part of a screen on which the video is not produced. CONSTITUTION:The video of the existing standard television broadcasting which is scanning converted is projected on a cathode ray tube screen and the video of other cannel of the existing standard television broadcasting and the video of the high definition television system can be projected on the part on the screen on which the video due to the difference of an aspect ratio is not produced. Namely, on the screen 11, the video projecting parts 12, 13 of the first and the second existing television broadcasting and the video projecting part 14 of the high definition television system are set. The high definition television signal is inputted to an input terminal 23, the video is synthesized in a synthesizing screen forming device 25, the videos of the first and the second existing standard televisions are respectively projected on the projecting parts 12, 13 and the video of the high definition television system is projected on the projecting part 14. The output signal of the synthesizing screen forming device 25 and the signal of the high definition television system are changed over by a change over circuit 26 and displayed on a high definition display 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high definition television receiver.

Conventional technology High-definition television displays detailed television images on a large wide screen to provide new appeal such as power and realism that cannot be obtained with current television broadcasting. Interest is increasing in all countries. This high-definition television was proposed by the Japan Broadcasting Corporation (NHK), and has a screen aspect ratio of 5:3 (or 16:9) (hereinafter referred to as 5:3) and a scanning line of 1.
It has 125 lines, which is different from the current standard television (4:3 aspect ratio, 525 scanning lines).

FIG. 4 shows a schematic configuration diagram when a current standard television signal is displayed on a conventional high-definition television receiver. A current standard television signal is input to a current standard television signal input terminal 41, and then a signal conversion device 43 performs scan conversion to double the number of scanning lines from 525 to 105Q. Then, a switching circuit 44 switches between this converted signal and a high-definition television system signal, and the signal is displayed on a high-definition display 45. Next, high-definition display 4
FIG. 3 shows a current standard television signal that has been scan-converted to 6.

In Figure 3, 31 is the screen of a high-quality display with an aspect ratio of 5:3, and since this and the scan-converted current standard television signal with an aspect ratio of 4:3 have different aspect ratios, the vertical length of the screen is A screen 32 of the current standard television when the horizontal lengths of the screens are the same and a screen 33 of the current standard television when the horizontal lengths of the screens are the same are displayed on a high-definition display 31 as shown in the figure.

FIG. 5 shows a conventional display example in which two or more types of current standard television broadcast images are displayed simultaneously on a cathode ray tube screen.

In FIG. 5, 61 is a video of the first current standard television broadcast, and 62 is a video of the second current standard television broadcast.

Problems to be Solved by the Invention However, when the current standard television image is projected on a high-definition television receiver with the above configuration, both left and right ends of the screen of the high-definition television receiver are displayed as shown in Figure 3 B. No image is displayed in the (shaded area). Or, as shown in Figure 3, both the top and bottom edges (shaded areas) of the current standard TV image.
However, there are problems in that the images are not displayed and necessary images are missing. Furthermore, if a second current standard television broadcast image 52 is inserted as a small screen into a first current standard television broadcast image 61 as shown in FIG. The problem is that the information is lost.

In view of the above-mentioned problems, the present invention has been developed so that when displaying current standard television broadcasting images using a high-definition television receiving device, parts of the image at both left and right ends of the cathode ray tube screen that do not produce images can be displayed without missing any part of the image. It is intended to be used effectively.

Means for Solving the Problems In order to solve the above problems, the high-definition television receiving device of the present invention projects scan-converted current standard television broadcast images on a cathode ray tube screen, and also takes into account differences in aspect ratios. The present invention is characterized in that it is configured so that images of other channels of the current standard television broadcasting and images of a high-definition television system can be projected on the portions of the screen where images do not appear.

Effect of the present invention With the above-described configuration, when displaying current standard television broadcast images on a high-definition television receiver, the vertical length on the screen is made the same so that the upper and lower ends of the CRT screen are not cut off, and the screen is Let either the left or right end of the image be the part where no image is generated. By making it possible to display images from other channels of current standard television broadcasting and images from high-definition television systems in this area, the display can be used effectively without missing necessary images.

Embodiment Hereinafter, a high-definition television receiving apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a state in which an image is displayed on a high-definition television receiver according to an embodiment of the present invention.

In FIG. 1, 11 is a cathode ray tube screen of a high-definition television receiver, 12 is a part that displays images of the first current standard television broadcast, and 13 is a part that displays images of other channels of current standard television broadcasts. A portion 14 is a portion for displaying high-definition television format images. Video projection section 13 of this current standard television broadcast other channels. The video projection section 14 of the high-definition television system has a first current standard television broadcasting video projection section 12 that is the same length as the top and bottom of the cathode ray tube screen, and a portion at either the left or right end where no video is generated. It is set to . FIG. 2 is a schematic configuration diagram of a high-definition television receiver according to an embodiment of the present invention.

In FIG. 2, 21° and 22 are current standard television signal input terminals, 23 is a high-definition television signal input terminal, and 24 is a signal conversion device that performs scan conversion to double the number of scanning lines from 625 to 1050. 25 is a composite screen creation device;
A high-definition television signal is input together with the output of the signal converter 24. A switching circuit 26 switches between the output of the composite screen creation device 25 and a high-definition television signal and supplies the signal to a high-definition display 27.

Regarding the high-definition television receiving apparatus configured as described above, the following is the first part. The operation will be explained using FIG.

When each signal is input from the current standard television signal input terminals 21 and 22, the signal conversion device 24 performs signal conversion such as scan conversion on the current standard television signal. As shown in FIG. 1, the next composite screen creation device 25 projects the image of the first current standard television that is input from the input terminal 21 to the projection section 12, and on the other hand, the image that is input from the input terminal 22 to the projection section 13. The second current standard television image is displayed. Further, when a high-definition television signal is input to the input terminal 23 in addition to the input terminals 21 and 22, the composite double-sided production device 25 operates at the first. The images of the second current standard television and the images of the high-definition television system are combined, and the images of the first and second current standard televisions are projected on the projection section 12 and 13, respectively, as shown in Figure 1. It operates to display a high-definition television system image on the output section 14. Note that the output signal of the composite screen creation device 26 and the high-definition television system signal inputted from the high-definition television system signal input terminal 23 are switched by the switching circuit 26 and displayed on the high-definition display 27.

Effects of the Invention As described above, according to the present invention, a high-definition television receiving device is provided with a signal conversion device that performs scan conversion of two or more types of current standard television signals, and one or more of these two signals. By providing a composite screen creation device that combines high-definition television signals and a switching circuit that switches between the combined video and high-definition television system video and supplies it to a high-definition display, a high-definition television receiving device can be created. When displaying current standard television images, the screen of a high-definition television receiving device can be effectively used without missing the images.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a screen display mode of a high-definition television receiver according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a high-definition television receiver according to an embodiment of the present invention, and FIG. Figures a and b are diagrams showing images of the current standard television broadcast projected on a conventional high-definition television display, Figure 4 is a schematic configuration diagram of a conventional high-definition television receiver, and Figure 6 is FIG. 3 is a diagram showing a composite screen display mode of another conventional current standard television. 11...High quality display, 12...
First current standard television image projection section, 13...Second current standard television image projection section, 14...High definition television system image projection section, 24... ... Signal switching device, 25... Composite screen creation device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (2)

[Claims] (1) For the first current standard television broadcast signal, which has a different aspect ratio from the high-definition television system signal,
a signal conversion circuit that performs signal conversion such as scan conversion; a composite screen creation circuit that combines both signals so that at least a high-definition television system signal can be displayed in the right or left space of the cathode ray tube screen depending on the ratio; a composite image output from the composite screen creation circuit; A high-definition television receiver comprising a switching circuit that switches between a high-definition television system video signal and supplies the same to the cathode ray tube. (2) Claim 1, in which a signal-converted second current standard television broadcast image is displayed in the space on the right or left side of the cathode ray tube screen together with a high-definition television image. high-definition television receiver.