JPH02248178A - High definition television display device - Google Patents

Abstract

PURPOSE:To display a signal into a screen with excellent size by switching a switch detecting whether an input signal is a standard system TV signal or a video signal of cinema scope size. CONSTITUTION:A standard TV interlace signal a2 is inputted to a signal conversion circuit 1 and outputted as a standard TV noninterlace signal a3. The signal a3 is outputted as a signal a4 subject to 3/4 time compression timewise by a time axis compression circuit 2. A signal detection circuit 10 detects whether the signal a2 is a conversional video image signal or a video image of cinemascope size and selects either of the signals a3, a4 with a switching signal a10. Thus, when the signal a3 is selected, the result is displayed as an output screen 22 and a video picture whose upper and lower parts are lost. When the signal a4 is selected, the resulting signal is displayed as an output screen 21. Thus, the size of the screen is switched into an excellent size by operating the switch automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-definition television display device capable of displaying standard television non-interlaced image signals.

BACKGROUND OF THE INVENTION In recent years, with the development of the MUSE high-definition television system, high-definition television as a next generation television has been realized. Among these, devices have been devised that attempt to display images based on conventional standard television signals on high-definition television displays as well.

As a conventional technique, for example, Japanese Patent Application Laid-Open No. 62'-263783
As shown in the publication, high-quality 3-base input signals are used as input signals.
7. There is a system that uses a television signal, a standard television signal, and an external signal, and outputs the external signal to the signal missing portion caused by the aspect ratio when outputting the standard television signal to a high-definition television display device.

Problems to be Solved by the Invention However, in the conventional configuration described above, when the standard television signal is a cinemascope size image with the top and bottom cut off, the output screen becomes as shown in 25 in Fig. 4. However, there is a problem in that the size of the display screen is not fully utilized.

In view of the above-mentioned problems, the present invention provides that when displaying a standard television signal image on a high-definition television output device, even if the standard television signal is a standard format television signal, the image is It is an object of the present invention to provide a high-quality television display device that can display images on a good screen size even when the bottom of the signal is cut off.

Means for Solving the Problems To achieve this object, the high-definition television display device of the present invention employs a signal conversion circuit that converts a standard television interlaced (GT) signal into a standard television non-interlaced signal. , a time-base compression circuit that compresses the time-base of a standard television non-interlace signal, an output control circuit that controls the output period of the time-base compressed signal, and video signal characteristics of the input standard television interlace signal. A signal detection circuit outputs a switching control signal according to the time axis, and a standard television non-interlace signal compressed in the time axis and a standard television non-interlace signal not compressed in the time axis are input, and switching control from the signal detection circuit is performed. A switching circuit that switches the output signal depending on the signal, a switching circuit that receives the output signal of this switching circuit and a high-definition television signal and switches the output signal by external operation, and a switching circuit that switches the output signal when the high-definition television signal is output and the standard television signal It consists of a television output device equipped with a synchronization/deflection circuit that performs different synchronization/deflection depending on the characteristics of the signal, even when outputting a standard television signal.

Effect: With this configuration, when outputting a standard television signal with a different aspect ratio from a high-definition television signal to a high-definition television output device, the magnitude of deflection and time compression of the signal are performed depending on the signal condition. A good size output screen can be obtained.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention.

In FIG. 1, 1 is a signal conversion circuit, 2 is a time compression circuit, 3 is an output control circuit, 4 is a switching circuit, 5 is a switching circuit, and 6
is a high-definition television output device, 7 is a synchronization/deflection circuit,
1o is a signal discrimination detection circuit.

A standard television interlaced signal (NTSG signal) that is converted into digital data and made into a component signal.
) is input to the a2td signal conversion circuit 1, and 525 lines (1:
1) is output as the standard television non-interlaced signal a5. This standard television non-interlaced signal a6:d is input to the time axis compression circuit 2, and is
It is output as a signal a4 whose time axis has been compressed to /4.

Note that the period during which the time axis compression signal a4 is output is controlled by the output control signal a6 from the output control circuit 3.

In this embodiment, the output control signal a6 is lj L +
Signal output is enabled when it is 1, and disabled when it is ++H++.

Further, FIG. 2 shows a comparison of the period of each signal and the time length of data. However, the timings of the standard television computer interlace signal a2, the signal conversion output signal a3, and the time compression output signal a4 are different from the actual timings.

Signal conversion circuit output signal! L5 and time compression circuit output signal a
4.' is input to the switching circuit 4, and the switching control signal a+[]
One of them is selected and becomes the output signal a5.

If the input standard television interlaced signal 5ja2 displays a normal video and the signal conversion circuit output signal a3 is selected, the video signal should be displayed as the output screen 22, but In fact, the output screen is 20 times the size of the mulberry on top.

The bottom of the image is cut off.

When the time compression circuit output signal a4 is selected, the video signal is displayed on the output screen 21.

Although the output screen 21 is displayed to the left here, it can be displayed at any position during the horizontal scanning period by changing the output control signal a6.

On the other hand, input signal standard television interlace signal a2
If the image is a cinema scope size image as shown in the screen 25 in FIG. 4, and the time axis compression circuit output signal a4 is selected, the image will become very small as shown in FIG. . That is, when the standard television interlaced signal a2 of the input signal is a cinemascope size image, if l/Ji is selected, and the signal conversion circuit output signal a3 is selected in the switching circuit 4, the image becomes a normal image and the screen effective range becomes wider.

Therefore, the signal detection circuit 1o eliminates the above-mentioned drawbacks, and detects whether the standard television interlace signal a2 of the input signal is a normal video or a cinemascope size video, and performs switching. Using the control signal a10, when the standard television interlace signal a2 is a normal video, the switching circuit 4 selects the time compression circuit output a4, and when the standard television interlace signal a2 is a cinemascope size video, the switching circuit 4 selects the signal conversion circuit output. Select a5.

The output a5 of the switching circuit 4 and the high-definition television signal a1 are input to the switching circuit 5, and one of them is selected and outputted by the cut-off division 1 word a8 to become the output signal a+1. This switching control signal a8 is also input to the synchronization/deflection circuit 7.

The synchronization/deflection circuit 7 is set to 1 when the switching control signal a8 selects the high-definition television signal 1Jal as the output IN.
A synchronizing signal a9 is output for displaying 1125 images (2:1 increment) on the screen. Further, when the switching control signal a8 selects the output a5 of the switching circuit 4 as the output a11, the same signal a9 for displaying 526 images (1:1 non-interlaced) on one screen is output.

91. Father, when outputting 525 lines (1:1) as a synchronization signal, if signal a6 is selected as output a5 of switching circuit 4, vertical deflection is performed to send the upper and lower video signals out of the screen. The amplitude is made larger than when signal a4 was selected.

The video output a-N and the synchronization signal a9 are input to a high-definition television output device and a video is displayed.

Effect of the invention As described above, the present invention provides a time axis compression circuit.

Synchronization/deflection frequency changes by switch operation
By using a deflection circuit, the display surface can be utilized effectively even when a standard television signal is displayed on a high-definition television display by means of a switching circuit, and its practical effects are significant.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a high-definition television display device according to an embodiment of the present invention, FIG. 2 is a waveform diagram of signals at each part thereof, FIG. 3 is a front view of a display screen with the configuration shown in FIG. 1, and FIG. FIG. 4 is a front view of the display screen according to the example of Cong. 1...Signal conversion circuit, 2...Time compression circuit, 3...Output control circuit, 4...Switching circuit, 5...Switching circuit , 6... High-definition television output device, 7... Synchronization/deflection circuit.

Claims (1)

[Claims] a signal conversion circuit that receives a standard television interlaced signal and outputs a standard television non-interlaced signal; a time-base compression circuit that receives the output signal of this signal conversion circuit and compresses the signal on a time-base; an output control circuit that controls an output period of the axially compressed output signal; and an output control circuit that receives the standard television interlace signal and outputs a first switching control signal according to the characteristics of the video signal of the standard television interlace signal. a first switching circuit that receives the output signal of the signal conversion circuit and the output signal of the time axis compression circuit and selects and outputs both output signals by a switching control signal; and a high-definition television. a second switching circuit that receives the interlaced signal and the output signal of the first switching circuit and selects and outputs both signals according to a second switching control signal; and the first and second switching circuits. It is characterized by comprising a synchronization/deflection circuit whose synchronization/deflection frequency is switched by a signal, and a high-definition television output device into which the output signal of the second switching circuit and the output signal of the synchronization/deflection circuit are input. A high-definition television display device.