JP2748496B2 - High Definition Television Display - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-definition television display device capable of displaying standard television and non-interlaced signals.

2. Description of the Related Art In recent years, with the development of the so-called MUSE system, the appearance of high-definition televisions as next-generation televisions is becoming concrete.
Among them, there has been proposed a display for displaying a conventional standard television signal on a display of a high-definition television.

As a conventional technique, a high-definition television signal, a standard television signal and an external signal are used as input signals as disclosed in Japanese Patent Application Laid-Open No. 62-263783, and a standard television signal is converted to a high-definition television display device. When outputting to the
Some output external signals.

However, in the above-described configuration, in the case where the standard television signal is an upper and lower cut image such as a cinemascope size, the output screen is as shown in FIG. However, there is a problem that it cannot be utilized.

The present invention has been made in view of the above problems, and when a standard television signal image is output to a high-definition television output device, even if the signal is a standard signal, the upper and lower portions are cut off like the above-mentioned cinemascope size image. It is an object of the present invention to provide a high-definition television display device that projects an image with a good screen size even for a signal.

Means for Solving the Problems To achieve this object, a high-definition television display device according to the present invention comprises a signal conversion circuit for converting a standard television interlace signal into a standard television non-interlace signal, and a standard television. A time compression circuit for temporally reducing a non-interlaced signal, an output control circuit for controlling the output period of the time-compressed signal, and a switching control signal output according to the characteristics of the input standard television interlace signal video signal A switching circuit for receiving a time-compressed standard television non-interlaced signal and a time-compressed standard television non-interlaced signal and switching an output signal by a switching control signal from the signal detecting circuit; The circuit output and the features of the high-definition television signal and the input synchronization signal A switching circuit for inputting a switching control signal between a television signal and a standard television signal and switching an output signal by the switching control signal;
When synchronizing high-definition television signals, outputting standard television signals, and standard television signals, the synchronization and deflection are different according to the characteristics of the signals. Device.

Operation With this configuration, when outputting a standard television signal having an aspect ratio different from that of a high-definition television signal to a high-definition television output device, the magnitude of the deflection and the signal are determined by whether or not the signal is a cinemascope size. By performing time compression, an output screen having a good size can be obtained.

Embodiment Hereinafter, a high definition television display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a high definition television display device according to one 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,
6 is a high-definition television output device, 7 is a synchronization / deflection circuit, and 8 is a signal detection circuit.

The operation of the high-definition television display device configured as described above will be described below.

Standard television interlaced signal a ₂ became component signals are digital data of the signal converter circuit 1
It is input to, 525 (1: 1) is outputted as standard television noninterlaced signal a ₃ in.

Standard television noninterlaced signal a ₃ is input to the time compression circuit 2, is output as a signal a _4, which is temporally compressed to 3/4.

The period of time compressed signal a ₄ is output is controlled by the output control signal a ₆ which is the output of the output control circuit 3. And signal a ₄ permit output when the output control signal a ₆ is "L" in the present embodiment, becomes impossible when the "H".

Signal conversion circuit output signal a ₃ and the time compression circuit output signal a ₄ is input to the switching circuit 4, one by switching control signal a ₁₀ is selected as an output signal a _5.

If the standard television interlaced signal a ₂ of the input signal is a signal conversion circuit output signal a ₃ is selected in the ordinary video,
The video signal becomes an output screen 22 (see FIG. 3), but if the screen size in the horizontal direction is adapted to that of a high-definition television system due to the difference in aspect ratio, the output screen is actually
On the input video signal a ₂ to only the magnitude of 20, the video has expired down.

On the other hand, if the time compression circuit output signal a ₄ is selected, a video signal is output to the output screen 21.

Here the output screen 21 is has a left side, by modifying the output control signal a ₆ can be displayed on any duty post in the horizontal scanning period.

Next, the standard television interlace signal of the input signal
a ₂ is a picture of cinema scope size as shown in Figure 4, and if the time compression circuit output signal a ₄ is selected very the high definition television screen as shown in FIG. 4 It becomes a small image. That standard television interlaced signal a ₂ of the input signal is in the case of video cinema scope size is better that the switching circuit 4, the signal conversion circuit output signal a ₃ is selected screen scope is widened.

Therefore, in the present invention, to eliminate the signal detection circuit 8 or more disadvantages, the standard television interlaced signal a ₂ of the input signal, or a normal video, detecting whether the video cinema scope size, the switching control signal a _10, a standard television interlaced signals a ₂ selects the time compression circuit outputs a ₄ by switching circuit 4 in the case of normal video, switching circuit in the case of a video cinema scope size 4
Selecting a signal conversion circuit outputs a ₃ by.

In the case of a cinemascope-sized video, since the video signals before and after the vertical synchronization signal are almost at the black level, by detecting the level of the video signal for a certain period centered on the vertical synchronization signal, the cinemascope size is obtained. Whether or not there is can be detected. Synchronization, the deflection circuit 7, the input synchronizing signal a ₀ is determined whether high-definition television synchronization signal or a standard television synchronization signal, input to the switching circuit 5 to the determination result as a switching control signal a _6. The switching circuit 5 further includes a switching circuit 4
A high-definition television signal a ₁ is input and output a _5, one of the output signals a ₁₁ by switching control signals a _8.

The synchronization and deflection circuit 7 outputs the output a ₅ from the switching circuit 4.
When 1125 when the input synchronizing signal a ₀ so the synchronization signal is matched is a high definition television (2: 1) of the synchronizing signal a ₉ outputs to the output device 6, whereas, the input synchronizing signal a ₀ standard 525 when a television (1: 1) and outputs a synchronizing signal a ₉ on the output device 6. 525 as a synchronizing signal a ₉ (1: 1) and the output, and the switching control signal a ₁₀ is the signal a to output a ₅ of the switching circuit 4
_{If 3} is selected, for issuing the upper and lower image signals to outside the screen, it is larger than when the vertical deflection amplitude signal a ₄ has been selected.

Video signal a ₁₁ and the synchronizing signal a ₉ in the above manner is input to the high-definition television output device, video is issued movies.

As described above, the present invention provides a high-definition television broadcast when a television signal is displayed on a high-definition television display device by a time compression circuit, a deflection circuit whose deflection frequency changes by a switch operation, and a switching circuit. The display surface can be effectively used for standard television broadcasts and even cinemascope-sized broadcasts, and the practical effect is large.

[Brief description of the 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 for explaining the operation of the high-definition television display device of FIG. 1, and FIG. FIG. 4 is a diagram showing an output screen according to the configuration shown in FIG. 4, and FIG. 4 is a diagram showing an example of a conventional display screen. DESCRIPTION OF SYMBOLS 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 and deflection circuit , 8
…… Signal detection circuit.

Claims (1)

(57) [Claims] 1. A signal conversion circuit for inputting a standard television interlace signal and outputting a standard television non-interlace signal, a time compression circuit for inputting an output of the signal conversion circuit and compressing the signal on a time axis, An output control circuit for controlling the output timing of the output signal, and the first television interlace signal as input, and a first video signal of the standard television interlace signal is determined according to whether or not the video signal is a cinemascope-sized signal. A signal detection circuit for outputting a switching control signal, a first switching circuit for receiving the output of the signal conversion circuit and the output of the time compression circuit, selecting an output signal in accordance with the first switching control signal, and a synchronization signal. Deflecting circuit for outputting a synchronization, deflection control signal and a second switching control signal in response to an input synchronization signal; and a high-definition television interface. A second switching circuit which receives a source signal, the first switching circuit output signal, and the second switching control signal, and selects an output signal according to the second switching control signal; and the second switching circuit. A high-definition television display device comprising: a high-definition television output device that receives a circuit output signal and the synchronization and deflection control signals.