JPS6219020Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multi-screen device in which a plurality of image display bodies such as a cathode ray tube display or a transmission type projection television are combined to form one screen, and in particular, the present invention relates to a multi-screen device in which a plurality of image display bodies such as a cathode ray tube display or a transmission type projection television are combined to form a single screen. The present invention relates to a multi-screen device that prevents deterioration in the quality of displayed images due to portions of the screen.

A multi-screen device is a device that constructs a large screen by combining multiple image displays such as cathode ray tube displays or transmission projection televisions, and is suitable for cases where a large number of people view the same image. ing.

FIG. 1 is a front view showing an example of a multi-screen device commonly used in the past, in which four image display bodies 1a to 1d are assembled into quarters in a cross shape. And each image display body 1a~
The outer periphery of the frame 1d is fixed by the frame 2, thereby forming one screen.

However, in the above-mentioned conventional multi-screen device, non-light-emitting joints 3 are generated at adjacent portions of each of the image displays 1a to 1d due to their structure.
Within the display screen, the non-light-emitting portion of the joint 3 appears as a black streak, which causes a problem of a significant deterioration in the display quality of the composite image.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a multi-screen device that prevents deterioration in display quality due to joints of screen display bodies.

In order to achieve such an objective, the present invention provides a light emitting body along the joint of the screen display body, and controls the luminance of the light emitting body in accordance with the brightness of the screen display body to which the light body is combined. This makes the joints less noticeable. Hereinafter, the multi-screen device according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a circuit diagram showing an embodiment of the multi-screen device according to the present invention. In the same figure, 1 ₁ ~
1 _o is a color demodulation circuit of each video display body that receives a video signal as an input; 2 ₁ to 2 _o are color output circuits that receive color demodulation signals supplied from the color demodulation circuits 1 ₁ to 1 _o , respectively; 3 _{1 ~ 3o} , ₄₁ ~ _4o , _{51 ~ 5o} are projection type cathode ray tubes driven by respective color output circuits ₂₁ ~ _{2o ;} 3 _o , 4 _o , and 5 _o constitute three color light emitting sources for each screen display, respectively. 6 ₁ to 6 _o are drive circuits that receive horizontal output signals supplied from a horizontal output circuit (not shown), and their outputs are connected to the primary side of the flywheel transformer 8 constituting the high voltage generation circuits 7 ₁ to 7 _o . It is supplied to P. The potential across the resistor 9 connected between the primary side P of the flyback transformer 8 and the ground is
Each color output circuit 2 ₁ to 2 _o as a control signal
is supplied to. On the other hand, each high voltage generation circuit 7 ₁ ~
The high voltage signals generated from the secondary side _S of the flyback transformer 8 constituting the cathode ray tubes 3 ₁ to 3 are converted into DC high voltage signals via rectifier circuits 10 ₁ to 10 _o , respectively. _o , 4 ₁ ~ 4 _o , 5
₁ to 5 _o each of the anodes are supplied respectively. Further, a resistor 11 is connected between the secondary side S of the flyback transformer 8 constituting each of the high voltage generating circuits 7 ₁ to 7 _o and the ground, respectively.
The configuration is such that the voltages at both ends thereof are taken out as beam current signals A ₁ to A _o . 12 is the average brightness of one display screen composed of a plurality of combinations of screens projected and synthesized by each cathode ray tube 3 ₁ - 3 _o , 4 ₁ - 4 _o , 5 ₁ - 5 _o This is an average brightness detection unit that performs detection. In this case, the average brightness detection section 12 includes each high voltage generation circuit 8 ₁ to
Beam current signal A ₁ ~ outputted from 8 _o respectively
It is constituted by resistors 13 ₁ to 13 _o that add and combine A _o and output an average luminance signal B. 1
4 is a brightness control circuit that receives the average brightness signal B supplied from the average brightness detection section 12, and controls the brightness of the light emitting body 15 using a fluorescent substance or the like arranged along the joint of the screen display body. Do the following.

In the multi-screen device configured in this way, when a video signal is supplied to each screen display, this video signal is sent to each color demodulation circuit 1 ₁ to 1 _o.
The demodulated color signals are supplied to the color output circuits 2 ₁ - 2 _o and output to the respective cathode ray tubes 3 ₁ - 3 _o ,
Guard currents supplied to 4 ₁ to 4 _o and 5 ₁ to 5 _o are controlled. On the other hand, each drive circuit 6 ₁ to 6
_o receives a horizontal output signal supplied from a horizontal output circuit (not shown) as an input, and pulse-drives the primary side P of the flyback transformer 8 in response to this horizontal output signal. Therefore, a high voltage is generated on the secondary side S of the pulse transformer 8, thereby forming the high voltage generating circuits ₇₁ to _7o . The high voltage signals generated in this manner are rectified in rectifier circuits 10 ₁ to 10 _o, respectively, and then sent to cathode ray tubes 3 ₁ to 3 _o , 4 ₁ to 4 _o , 5
₁ to 5 _o each of the anodes are supplied. In this case, each cathode ray tube 3 ₁ to 3 _o , 4 ₁ to 4 _o ,
The beam current of 5 ₁ to 5 _o is transmitted to the color output circuit 2 ₁ to 2 _o.
In this process, the cathode ray tubes _{31 to 3o} , _{41 to 4o} , and 51 to 5o are controlled _in accordance with the demodulated color signals supplied from the color demodulation circuits _{11 to 1o} . Images of each color with luminance corresponding to the beam current are reproduced and projected respectively. Therefore, the amount of beam current corresponds to the brightness of the reproduced image, and the _amount of beam current corresponds to the _brightness of the reproduced image. At both ends of the resistor 11, there are three cathode ray tubes 3 ₁ , 4 in charge of red, blue, and green that make up each screen.
The sum of the beam currents flowing through the beams ₁ , 51 _{to 3o} , _4o , and _5o, respectively, is output as beam current signals _A1 to _Ao . That is, the beam current signal
A ₁ to A _o represent the brightness of each image display body that is combined. Each beam current signal A ₁ to _{A o} extracted in this way
are added and averaged at the resistors 13 ₁ to 13 _o , so that the average brightness detection unit 1
2 outputs an average brightness signal B indicating the average brightness of each image display body. The brightness control circuit 14 controls the brightness of the light emitters 15 arranged along the joints of the image display bodies in accordance with the average brightness signal B supplied from the average brightness detection section 12. Therefore, the light emitting body 15 is controlled to emit light at a brightness corresponding to the average brightness of the display screen of the multifaceted screen formed by the combination of the image display bodies. As a result, the joints, which were conventionally represented as black lines, are blurred and become less noticeable. Since the brightness of this joint changes according to the average brightness of the entire display screen, it becomes less noticeable even when the contents of the display screen change, and as a result, the quality of the displayed image decreases. will be significantly improved.

In addition, in the above embodiment, a case was explained in which a phosphor was used as a light emitting body disposed along the joint, but the present invention is not limited to this, and red, green, and blue can be used. It may also be configured by juxtaposing light-emitting lamps or light-emitting diodes.

As explained above, in the multi-screen device according to the present invention, a light emitting body is provided along the joint of each screen display body, and the brightness of this light emitting body is controlled in accordance with the average brightness of the display screen. Even when the display screen changes, the joint can always be made inconspicuous, which has the excellent effect of greatly improving the display quality of the displayed image.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional multi-screen device, and FIG. 2 is a circuit diagram showing an embodiment of the multi-screen device according to the present invention. 1 ₁ - 1 _o ... color demodulation circuit, 2 _{1 -} 2 _o ... color output circuit, 3 _{1 -} 3 _o , 4 _{1 -} 4 _o , 5 _{1 -} 5 _o ...
Cathode ray tube, 6 ₁ ~ 6 _o ... Drive circuit, 7 ₁ ~
7 _o ... High voltage generation circuit, 8... Flyback transformer, 9, 11... Resistor, 10 ₁ to 10 _o ... Current circuit, 12... Average brightness detection section, 13 ₁ to 13
_o ...Resistor, 14...Brightness control circuit, 15...Light emitter.

Claims (1)

[Scope of utility model registration request] In a multi-screen device in which a plurality of image displays such as a cathode ray tube display and a transmission type projection television are combined to form one display surface, a light emitting device arranged along the joint of each of the image displays 1. A multifaceted screen device comprising: a display body; and an average brightness detection section that detects the overall average brightness of each of the image display bodies and controls the luminance of the light emitting body, and makes the joint part inconspicuous.