JPH0851577A - Television receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] When images with different aspect ratios are displayed for a long time, display burn that occurs due to the difference in deterioration degree between the part where the image is displayed and the part where the image is not displayed is prevented. A display means 8 for displaying an image, a detection means 2 for detecting that the aspect ratio of the image is different from the aspect ratio of the display, and an image output for changing the image output position by a signal from the detection means 2. This is a television receiver provided with position control means 5 and 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver in which the aspect ratio of a received image is different from that of the receiver.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for the realism of images, and in satellite broadcasting, high-definition broadcasting based on the MUSE system has been put to practical use, and test broadcasting is currently being conducted. Also for terrestrial broadcasting, EDTV-II system broadcasting is scheduled to start in 1995. In such next-generation broadcasting, the aspect ratio became wider than the conventional 4: 3 aspect ratio.
Broadcasting with an aspect ratio of 6: 9 is planned.

This is done in order to widen the image portion for the human visual field and improve the sense of presence by making the aspect of the screen horizontally long. A receiver with such a wide screen is also on sale.

[0004]

However, in a receiver having such a wide display, the conventional 4:
When viewing an image of aspect ratio 3, the image is not the entire display but a part of the image is not displayed. In a display using a cathode ray tube, this means that the electron beam does not hit a part of the screen for a long time.

Generally, in a cathode ray tube, an electron beam hits the fluorescent screen to emit light, but the fluorescent screen is deteriorated by the electron beam hitting. In normal use,
This deterioration is generally not so noticeable because the entire screen is uniformly deteriorated because the electron beam hits the entire screen.
However, in a receiver having a wide screen with different aspect ratios, when a 4: 3 image is viewed, a part where the electron beam does not hit occurs and the deterioration does not occur uniformly. Therefore, the display burns partially,
There is a problem in that there is a difference in light emission on the phosphor screen.

Further, in the conventional 16: 9 image receiver, 4:
A method of displaying a 4: 3 image on a 16: 9 screen by reducing the amplitude of the horizontal deflection signal to reduce the electron beam scanning range when displaying a 3: 1 image is also used. However, in such a method, due to the dullness of the deflection signal at both ends of the deflection, the electron beam hits for a long time, and the display burns easily.

Therefore, the conventional 16: 9 image receiver receives 4: 3.
When viewing the image for a long time, the display burns partially, but a television receiver that prevents this will be required in the future.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a television receiver that prevents display burning even when images with different aspect ratios are displayed for a long time.

[0009]

In order to solve the above-mentioned problems, a first means of the present invention is a display means for displaying an image and a detecting means for detecting that the aspect ratio of the image is different from the aspect ratio of the display. And image output position control means for changing the image output position according to the signal from the detection means.

A second means of the present invention is a display means for displaying an image and a detecting means for detecting that the aspect ratio of the image is different from the aspect ratio of the display.
First input means for inputting a video signal currently being received, second input means for inputting an image signal, and signals input from the first input means and the second input means are input, When the aspect ratio of the video signal from the input means is different from the aspect ratio of the display, there is provided signal processing means for outputting the image of the second input means in a portion where the video is not displayed.

The third means of the present invention is, in a television receiver for displaying images having different aspect ratios,
Deflection means for generating horizontal and vertical deflection signals for deflecting the electron beam so that the entire display is formed, and acceleration signal control means for controlling to turn off the signal for accelerating the electron beam in a portion where no image is output are provided. It is a thing.

[0012]

As described above, in the first means according to the present invention,
By the image output position control unit that changes the image output position according to the signal from the detection unit, the electron beam is displayed on a portion that is not displayed because the aspect ratio is different, so that the electron beam is displayed on a portion of the display for a long time. It is possible to prevent a part that does not hit and to prevent partial display burning.

In the second means according to the present invention, signals from the first input means and the second input means are input, and the aspect ratio of the video signal from the first input means is the aspect ratio of the display. When different, by providing the signal processing means for displaying the image of the second input means in the non-displayed portion of the image, the electron beam can be displayed in the portion displayed in the non-displayed portion because the aspect ratio is different. It is possible to prevent a part of the display from touching a part of the display for a long time and prevent partial display burning.

Further, in the third means according to the present invention, the horizontal scanning method of the electron beam is applied to the entire screen by cutting the acceleration signal of the electrons so that the electrons are reflected at the folded portion due to the bluntness of the horizontal scanning signal. It is possible to prevent the display from burning due to the beam hitting for a long time.

[0015]

1 is a block diagram showing the configuration of a television receiver having an aspect ratio of 16: 9, which is an embodiment of the present invention. In FIG. 1, 1 is an antenna for receiving radio waves, 2 is a channel to be viewed from the received radio waves,
It is a tuner unit that extracts an intended video signal, and is also a detection unit that detects that the aspect ratio of the video differs from the aspect ratio of the display. Reference numeral 3 is a signal processing unit for processing a video signal, 4 is a switch for turning on a power source, and it also sends a signal to the counter 5 when it is turned on and off. 5 is a counter that changes the state by receiving the signal from the switch 4, 6 is R, G output from the signal processing unit 3,
This is an electron beam acceleration unit that generates an electron beam acceleration signal from the B signal.

Reference numeral 7 is a deflection unit for generating a signal for vertically and horizontally deflecting the electron beam, 8 is a CRT corresponding to the display means, and 9 is a deflection coil for deflecting the electron beam. 7, CRT 8 and the display means. Reference numeral 10 is a power supply unit that supplies power to each unit. The radio wave received by the antenna 1 is selected by the tuner unit 2 to extract a video signal of a desired station. Further, the aspect ratio of the image is extracted by the selected channel or the discrimination signal in the image signal, and when the aspect ratio of the image is different from the aspect ratio of the display, it is sent to the counter 5 as an aspect signal. The counter 5 receives this aspect signal and switches the control signal to the deflecting unit 7 by the signal from the switch 4. At this time, when the aspect ratio of the image is 4: 3, the aspect signal is output, the control signal is switched by the signal from the switch 4, and when the aspect ratio is 16: 9, the aspect signal is not output. The control signal for the image output position is not generated regardless of the signal. The extracted video signal enters the signal processing unit 3 and undergoes signal processing.
R, G, B signals. R, G, B signals are electron beam accelerator 6
And the electron beam acceleration signal is input to the CRT 8.

The deflecting section 7 generates a signal for deflecting the electron beam vertically and horizontally. The deflecting unit 7 deflects the electron beam vertically and horizontally so that a sawtooth wave as shown in FIG. 2 is generated, and the electron beam is deflected by its amplitude.
In the area A in FIGS. 2A and 2B, the voltage of the horizontal deflection signal increases, and accordingly the electron beam is deflected to the right as in the area A ′. When the voltage of the horizontal deflection signal becomes maximum, the electron beam undergoes maximum deflection to the right. Then, in the region B, the voltage of the horizontal deflection signal sharply drops, and the electron beam returns to the left accordingly. By repeating this, the electron beam is deflected to the left and right. At the same time, the vertical deflection is similarly performed by the vertical deflection signal.
By operating this vertical and horizontal deflection simultaneously, 2
The electron beam is scanned in three dimensions.

Therefore, by changing the starting voltage and the maximum voltage of the deflection signal, the scanning range of the electron beam can be changed, and an image can be output from an arbitrary position as shown in FIGS. 2 (a) and 2 (b). Become. Also, scaling of the image is possible by changing the starting voltage and the maximum voltage.

FIG. 3 shows an example of the counter 5 and the image output position. That is, when the counter 5 = 0, the image output position is left, and when the counter 5 = 1, the image output position is right. The deflecting unit 7 generates the starting voltage of the horizontal deflection signal from the voltage value set by the control signal from the counter 5, and changes the image output position of the video signal each time the power is turned on and off. As a result, when viewing a 4: 3 image on a 16: 9 screen, the image output position can be changed as shown in FIG. 3, and it is possible to prevent partial display burning. In addition,
In this embodiment, the image output position is set to two, but it may be set to three or more. A CRT was used as the display, but it can be applied to liquid crystal and the like because the display will deteriorate.

FIG. 4 is a block diagram showing the configuration of a television receiver having an aspect ratio of 16: 9, which is an embodiment of the present invention. In the television receiver of FIG. 1, the deflection unit 7
When the deflection signal output from the device becomes dull, the electron beam hits the edge portion of the image for a longer time than other portions, and display burning occurs in this portion. In FIG. 4, the output of the counter 5 is input to the signal processing unit 3, and the signal processing unit 3
Then, the output position of the R, G, B signals is changed to change the display position of the image. That is, the difference between FIG. 4 and FIG. 1 is that the output destination of the counter 5 is changed from the deflection unit 7 to the signal processing unit 3. At this time, the deflection signal from the deflection unit 7 is set so as to scan the entire screen.

FIG. 5 shows the relationship between the output timing of the R, G and B signals and the image output position. FIG. 5A shows an RGB signal (broken line) set to output the output timing of the RGB signal from t1 to t2, and an RGB signal (solid line) set to output from t3 to t4. . Image output position 1 in Fig. 5 (b) by RGB signal (solid line)
An image is displayed on the screen and the RGB signal (broken line) is used to display the image in
The image is output at the image output position 2 in (b). In this way, the image output position can be changed by changing the output timing of the RGB signals by the signal processing unit 3. Therefore, by inputting the output of the counter 5 that changes the state by the signal from the switch 4 to the signal processing unit 3 and changing the output timing of the R, G, B signals, the image output position can be changed. It is possible to prevent a typical display burn.

FIG. 6 is a block diagram showing the structure of a television receiver according to an embodiment of the present invention. 6 is different from FIG. 1 in that a control signal is input to the counter 5 from the tuner section 2 instead of the switch 4 to switch the state of the counter 5. The tuner section 2 generates a control signal when the sent voice is switched between monaural and stereo, and inputs the control signal to the counter 5 to change the state of the counter 5. The output of the counter 5 is input to the deflection unit 7, and the scanning range of the electron beam is changed by changing the start voltage and the maximum voltage of the deflection signal, and the image is displayed at any position as shown in FIGS. 2 (a) and 2 (b). It is possible to display images from.

By this, it is possible to change the image output position by the sound sent, it is possible to change the position of the image during the commercial period, or to control the image to be displayed on the entire screen, and it is possible to change it to a part for a long time. It is possible to prevent the image from being displayed and prevent the display from burning. In this example, the control signal is generated by the switching signal which is one of the audio monaural and stereo control signals, but other control signals in the video signal or the audio signal, such as a synchronization signal, may be used. .

FIG. 7 is a block diagram showing the configuration of a television receiver according to an embodiment of the present invention. 7 is different from FIG. 1 in that a control signal is input from the tuner unit 2 to the counter 5 instead of the switch 4 to switch the state of the counter 5. The tuner unit 2 generates a control signal when the sent voice is switched between monaural and stereo, and inputs the control signal to the counter 5 to change the state of the counter 5. The output of the counter 5 is input to the signal processing unit 3, where R,
Change the output timing of G and B signals to change the image display position.

As a result, it is possible to change the image output position by changing the output timing of the RGB signals by the signal processing unit 3 as shown in FIG. This makes it possible to change the image output position by the sound sent, and it is possible to change the position of the image during the commercial period and control it so that the image is displayed on the entire screen. It is possible to prevent the image from being drawn and prevent the display from burning.

In this example, the control signal is generated by monaural audio or stereo, but a control signal such as synchronization in the video signal or the audio signal may be used.

FIG. 8 is a block diagram showing the configuration of a television receiver according to an embodiment of claim 7 of the present invention. FIG.
7 is different from FIG. 7 in that an external signal processing unit 11 and a camera 12 are added.

In FIG. 8, the image taken by the camera 12 is processed by the external signal processing unit 11, and the image of the external signal processing unit 11 is displayed on the portion where there is no video signal by the signal processing unit 3 so that the entire screen is displayed. By displaying some images, it is possible to prevent partial display burning.
FIG. 9A shows images 2, 3 and 4, and FIG. 9B shows images 2 to 7.

In this embodiment, the video signal from the camera 12 is used, but the signal from the VTR or the like can be used. It is also possible to display an image as a background using an image signal from a disk or a ROM, for example, an image signal or a video signal of computer graphics. It is also possible to capture an image as a background, store it in a memory, process it by the external signal processing unit 11, and output it to a non-display portion of the image. It is also possible to input a plurality of videos or images to the external signal processing unit 11 and display a plurality of videos or images on the non-display unit.

[0030]

As described above, according to the present invention, when the image signals having different aspect ratios are displayed on the display, the display burning can be partially prevented by changing the display position, and the effect is great. There is something. Further, since the aspect ratio is different, it is possible to prevent a portion which is not displayed for a long time from occurring by displaying another image on a portion which is not displayed, and prevent the display burn, and the effect is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a television receiver that is a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a horizontal deflection signal and a vertical deflection signal and an image output position.

FIG. 3 is a diagram showing an example of values of a counter 5 and image output positions.

FIG. 4 is a configuration diagram of a television receiver that is a second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between an electron beam acceleration signal and an image output position.

FIG. 6 is a diagram showing a third embodiment of the present invention.

FIG. 7 is a diagram showing a fourth embodiment of the present invention.

FIG. 8 is a diagram showing a fifth embodiment of the present invention.

FIG. 9 is a diagram showing an image output example of a fifth embodiment of the present invention.

[Explanation of symbols]

 1 Antenna 2 Tuner 3 Signal Processor 4 Switch 5 Counter 6 Electron Beam Accelerator 7 Deflection 8 CRT 9 Deflection Coil 10 Power Supply

Claims (14)

[Claims] 1. Display means for displaying an image, detecting means for detecting that the aspect ratio of the image is different from that of the display, and an image output position for changing the image output position by a signal from the detecting means. A television receiver having a control means. 2. A means for inputting a signal from the outside, wherein the image output position control means changes the image output position according to the signal from the detection means and the signal from the outside. The television receiver according to claim 1. 3. The television receiver according to claim 2, wherein the external signal is an on / off signal of a power switch. 4. The television receiver according to claim 2, wherein the signal from the outside is a control signal in the video signal. 5. The television receiver according to claim 2, wherein the signal from the outside is a control signal in the audio signal. 6. Display means for displaying a video, detection means for detecting that the aspect ratio of the video is different from that of the display, first input means for inputting a video signal currently being received, and an image. Second input means for inputting a signal, and when the signals from the first input means and the second input means are input, and the aspect ratio of the video signal from the first input means is different from the aspect ratio of the display. A television receiver comprising: a signal processing means for displaying an image of the second input means on a portion where a video is not displayed. 7. The television receiver according to claim 6, wherein the second input means has an image pickup means for inputting a video and outputting as a video signal or a reproducing means for outputting a video signal from a recording means. . 8. A television receiver according to claim 6, wherein the second input means has a reproducing means for taking out and outputting an image from the recording means or a generating means for generating an image pattern. 9. In a television receiver for displaying images having different aspect ratios, a deflection means for generating horizontal and vertical deflection signals for deflecting the electron beam so as to cover the entire display, and a signal for accelerating the electron beam. A television receiver provided with acceleration signal control means for controlling to turn off in a portion where no image is displayed. 10. The television receiver according to claim 9, further comprising control means for controlling a timing of outputting the acceleration signal. 11. A means for inputting a signal from the outside is provided,
11. The television receiver according to claim 10, wherein the control means changes the image output position according to the signal from the outside. 12. The television receiver according to claim 11, wherein the external signal is an on / off signal of a power switch. 13. A television receiver according to claim 11, wherein the external signal is a control signal in the video signal. 14. The television receiver according to claim 11, wherein the signal from the outside is a control signal in the audio signal.