JPS62263783A - High definition television receiver - Google Patents

Abstract

PURPOSE:To effectively use a display screen by displaying an existing standard television signal completely on the display screen together with other signal without losing the video signal when projecting the exsting standard television signal. CONSTITUTION:The scanning converted existing standard television signal is projected on a high definition television receiver and other effective signal is projected on the part of horizontal ends on which the video on the screen due to the difference in an aspect ratio is not projected. Namely, on the screen 11 of the high definition television receiver 25, an existing standard television signal projecting part 13 and a signal projecting part of asymbol representing data, time or the like, a numeric character or a graphic are provided. The existing standard television signal is inputted to an input terminal 21 and the signal of the symbol representing the data and the time, the numeric character or the graphic is inputted to an external input terminal 26. The signal processing such as the scanning conversion is carried out by a signal converter 23 and a synthesizing video is formed by a synthesizing screen forming device 27. This signal and a high definition television signal inputted by an input terminal 22 are changed over in a change over circuit 24 to display on the high definition television receiver 25.

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 the current standard television system is scanning line 5.
25 lines, aspect ratio 4:3, compared to 1 scanning line.
It has 125 lines and an aspect ratio of 5:3 (or 16:9). However, in the future, high-definition television will not suddenly replace the current standard television, and it is thought that both television systems will continue to exist. At this time, there is a need for high-definition television receivers to receive and reproduce images of current standard televisions.

FIG. 3 shows a block diagram when displaying current standard television signals on a high-definition television receiver.

A current standard television signal is input to a current standard television signal input terminal 31, and the signal converter 33 approximately doubles the number of scanning lines to 525 so that it can be received by a high-definition television receiver 35. Then, the switching circuit 34 switches between this converted signal and the high-definition television system signal inputted from the input terminal 32, and the high-definition television receiver 3
Displayed on 5.

When displaying a high-definition television signal on the high-definition television receiver 35, since the aspect ratios match, there is no problem in that the information of the image on the screen is not missing or left over. However, when displaying the scan-converted current standard television signal on the high-definition television receiver 35, the current standard television signal has an aspect ratio of 4:3, so the aspect ratio is 6:3 (or 16:9) is displayed as shown in Figure 4 a and b.

Figure 4a shows the screen when the vertical heights of both the high-definition television receiver 35 and the scan-converted current standard television signal playback image are the same, and the horizontal lengths are the same. The screen at the time is shown in Figure 4 (displayed on a high-definition television receiver).

Problems to be Solved by the Invention However, when an image of a scan-converted current standard television signal is displayed on a high-definition television receiver with the above-described configuration, the screen of the high-definition television receiver will appear as shown in Figure 4a. There are problems in that the image is not displayed at the horizontal edges of the image, or information at both vertical edges of the image of the current standard television signal is lost, as shown in FIG.

In view of the above-mentioned problems, the present invention has been developed so that when displaying images of current standard television signals on a high-definition television receiver, the horizontal direction of the screen can be improved without causing loss of information at both vertical ends of the screen due to differences in aspect ratio. This is an attempt to make effective use of the parts of the image that are not displayed at the edges of the image.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention projects current standard television broadcast signals that have been scan-converted onto a high-definition television receiver, and furthermore displays images on the screen due to differences in aspect ratio. It is characterized in that other effective signals are projected on the horizontal end portions that are not output.

Effect of the Invention The present invention has the above-described configuration, and when displaying an image of a current standard television signal having a different aspect ratio from a high-definition television signal on a high-definition television receiver, information loss occurs in the vertical direction on the screen. By displaying symbols, numbers, or figures representing the month, day, time, etc. in the horizontal direction where the image is not displayed, the screen can be used effectively without waste.

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 current standard television signal displayed on the screen of a high-definition television receiver according to an embodiment of the present invention. In FIG. 1, 11 is the screen of a high-definition television receiver, 12 is a part that displays the current standard television signal, and 13 is a part that displays symbols, numbers, or graphic signals representing the month, day, time, etc. It is.

FIG. 2 is a block diagram of a high-definition television receiver according to an embodiment of the present invention. 26 is an external signal input terminal, 27 is a composite screen creation device, and other current standard television signal input terminals 21, high-definition television signal input terminals 22, signal conversion device 23, switching circuit 24, and high-definition television receiver. 25 is the same as that of the conventional example.

The high-definition television receiving apparatus configured as above will be explained below with reference to FIGS. 1 and 2.

A current standard television signal is input to the input terminal 21, and signals of symbols, numbers, or figures representing month, day, and time are input to the external input terminal 26. A signal conversion device 23 performs signal processing such as scan conversion, and a composite screen creation device 27 creates an image as shown in FIG. This signal and the high-definition television signal inputted through the input terminal 22 are switched by the switching circuit 24 and displayed on the high-definition television receiver 25.

As described above, according to this embodiment, the high-definition television receiving device includes the signal conversion device 23 that scan-converts the current standard television signal and signals of symbols, numbers, or figures representing month, day, and time; By providing a composite screen creation device 27 that combines both images, and a switching circuit 24 that switches between the combined image and the image of the high-definition television signal, the high-definition television receiver can receive the current standard television signal. When displaying, the video information is not lost, and the display screen of the high-definition television receiver can be used effectively.

Effects of the Invention As described above, according to the present invention, when displaying a current standard television signal on a high-definition television receiver, the video signal is displayed on the entire display screen along with other signals without being dropped. This makes it possible to effectively utilize the display screen of a high-definition television receiver.

[Brief explanation of drawings]

FIG. 1 is a front view showing the display state of a high-definition television receiver according to an embodiment of the present invention, FIG. 2 is a block diagram of the same device, and FIG. 3 is a block diagram of a conventional high-definition television receiver. , Figure 4a. b is a diagram showing a display state in the conventional case. 11... High definition television receiver, 12...
...Current target fishing television image projection department, 13...
. . . External signal image projection unit, 26 . . . External signal input terminal, 27 . . . Composite screen creation device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A signal conversion circuit that performs signal conversion such as scan conversion for the current standard television signal with a different aspect ratio from the high-definition television signal, and a signal that displays the month, day, and time, and a screen that converts the image of the current standard television signal to the screen. A composite screen creation circuit that projects a signal that displays the month, date, and time, etc. on the surplus portion of the screen due to the difference in aspect ratio when displayed on the screen, and a composite screen creation circuit that displays the video output from the composite screen creation circuit and the video of the high-definition television signal. A high-definition television receiver equipped with a switching circuit.