JP2000241879A - Automatic screen position adjustment device for multi-screen display device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Conventionally, in a multi-screen display device,
In order to match the joints of the images displayed on adjacent screens, a skilled person has spent a lot of time adjusting the screen position. According to the present invention, a reflecting mirror and a light detection sensor are commonly arranged at a joint portion between adjacent screens, light projected from an adjacent projector is reflected by the reflecting mirror, and the reflected light is reflected by an optical sensor. An automatic screen position adjusting device for a multi-screen display device, which automatically adjusts a screen position of image light projected from a projector to a predetermined position using a detected detection signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen display device in which a plurality of projection display means having a screen and a projector are arranged in a row and capable of displaying one large-screen image, and is displayed on each screen. The present invention relates to an automatic screen position adjusting device that can adjust the position of a screen so as to match the joint of images between adjacent screens.

[0002]

2. Description of the Related Art Conventionally, multi-screen display devices are often used in event venues where various performances and exhibitions are performed. This device forms a large screen by arranging a plurality of screens vertically and horizontally, and projects and displays images from a plurality of projectors on each screen.

As such a display device, there are a display device in which each projector and a screen are separable so as to be assembled at an event venue, and a display device in which a plurality of projection television receivers each having a projector and a screen integrated are arranged side by side. .

[0004] Since the images displayed on the multi-screen are composed of images projected from the individual projectors connected to each other to form a single screen, it is necessary to match the adjacent image display positions.

[0005] For example, as shown in FIG. 4, four screens A to D are arranged vertically and horizontally adjacent to each other, and the individual screens A to D are arranged.
When images from four projectors are projected on a single large screen and the screen positions of the images displayed on each screen do not match, the continuity of the images is lost,
The image is very unsightly and of poor image quality.

For this purpose, it is necessary to individually adjust the display positions of the images projected from the respective projectors. Images such as crossbars are displayed on screens A to D, and the skilled person adjusts the position while watching the images. It is carried out. However, in such a multi-screen display device, it is necessary to carry in individual projectors and screens to an installation place, assemble them, and then adjust the screen position of an image displayed on each screen. Also, the projector may be brought into the installation place after assembling it in advance, but if a cathode ray tube is used as the projector, the screen position will be shifted between the place at the pre-assembly and the installation place due to the influence of geomagnetism, and the screen will be Position adjustment is required.

On the other hand, in a projection television receiver in which a projector and a screen are integrally formed, a sensor is provided near the outer periphery of the screen of each of the receivers, and video light detected by the sensors is used. Automatic adjustment of screen position and amplitude is also performed.
However, when assembling a plurality of individual projection television receivers having such an automatic screen position adjustment function, if the assembly position of the adjacent projection television receiver is shifted, the position of the adjacent screen is different, The displayed screen position needs to be readjusted.

[0008]

Conventionally, in a display device in which a plurality of projectors are arranged vertically and horizontally to project an image on a multi-screen, when a screen position of an image displayed on an adjacent screen is shifted. For each projector, there is a problem that screen position adjustment by an expert is required, which requires much time for adjustment, and that the position adjustment of the entire screen becomes difficult.

Further, when a multi-screen display device is constructed using projection television receivers each having an automatic screen position adjustment function, the position of the adjacent screen television is reduced due to the displacement of the assembly position of the adjacent projection television receiver. Therefore, it is necessary to adjust the screen position to be displayed again.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-screen display device capable of automatically adjusting a screen position between adjacent screens.

[0011]

According to the present invention, there is provided a multi-screen display device in which a plurality of projection display means having a screen and a projector are arranged in series and an image projected from each projector is displayed on a corresponding screen. In the vicinity of the boundary between the screens adjacent to each other, a reflecting mirror arranged to receive and reflect the image light projected from two adjacent projectors,
Light detection means arranged to face the reflecting mirror and configured to detect image light projected from the two projectors reflected by the reflecting mirror using a common light sensor,
Using image light detected by the light detecting means, a screen position adjusting means for controlling a display position of an image projected from a projector adjacent to each other, and storing position data after screen position adjustment of each projector. An automatic screen position adjusting device for a multi-screen display device comprising a storage means.

According to the present invention, when adjusting the screen position of the adjacent projection display means, the image displayed on both projection display means can be detected using a common optical sensor, and this detection result is used. Thus, the screen positions of the adjacent projection units can be adjusted.

[0013] The reflecting mirror may include adjacent first and second mirrors.
And one image light projected from the projector of the first projection display means toward the screen of the second projection display means, and one of the image light projected from the projector of the second projection display means. The image light projected toward the screen of the first projection display means can be made incident on the reflecting mirror.

The screen position adjusting means adjusts the screen position of one of the projection display means as a set of the first and second projection display means, and then adjusts the other projection in accordance with the screen position. The screen position of the display means is adjusted.

Further, the screen position adjusting means displays a test pattern image by the one projection display means,
The screen position is moved and adjusted so as to detect the test pattern image light by the light detection means, and then the same test pattern image is displayed by the other projection display means, and the test pattern image light is detected by the light detection means. The screen position is moved and adjusted so as to be detected.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram for explaining the principle of an automatic screen position adjusting device for a multi-screen display device according to the present invention. In addition, FIG.
This shows an example in which two projectors are connected and arranged.
FIG. 2A shows a configuration diagram of the present invention.

In FIG. 2A, set A, set B
Denotes a projector, and screens 11 and 12 are arranged corresponding to these sets A and B. Set A,
B includes a video signal processing circuit, video display means such as a cathode ray tube or a liquid crystal display element, and a projection lens for enlarging and projecting the video displayed on the video display means as video light.

A screen A11 and a screen B12 for displaying image light are connected to each other, and image light 13a from the set A is projected on the screen A11.
The image light 14a from the set B is projected on the screen B12.

The screen A11 and the screen B12
Are separated by a partition plate 10 so that light from an adjacent projector does not interfere. A window is provided in a portion of the partition plate 10 close to the screen, and the window is provided with a reflecting mirror 15 for reflecting the image light from the sets A and B to the projection side. This reflecting mirror 15 is, of the image light projected from the set A,
Reflects the image light 13b projected toward the adjacent screen B12 and reflects the image light 14b projected toward the adjacent screen A11 among the image light projected from the set B. is there.

The image light 13 reflected from the reflecting mirror 15
The light beams b and 14b are condensed on an optical sensor 16 disposed opposite to the reflection surface side of the reflection mirror 15. The optical sensor 16 is provided with the image light 13b, 1 reflected by the reflecting mirror 15.
4b, a light detection signal 17 (described later) is generated.

The light detection signal 17 is transmitted to each of the sets A,
It is supplied as a position adjustment control signal to the screen position adjustment circuit B.

The adjusting operation of the automatic screen position adjusting device having such a configuration will be described with reference to FIG.

At the time of this adjustment, a test pattern signal composed of, for example, a cross in a straight line is supplied to the sets A and B. Further, it is assumed that the reflecting mirror 15 and the optical sensor 16 are arranged at the vertical center of the boundary between the screen A11 and the screen B12.

First, as shown in FIG. 2A, the test pattern 2 projected from the set A on the screen A11
0 is displayed and nothing is displayed on the screen B12. Thereby, the image light 13 from the set A
Among them, the image light 13b projected on the screen 12B toward the wheel is reflected by the reflecting mirror 15 and detected by the optical sensor 16, and the detected light detection signal is supplied to the screen position adjustment circuit of the set A. The screen position adjusting circuit is configured to detect the predetermined amount of image light by the optical sensor 16.
Test pattern 20 displayed on screen A11
Is moved in the vertical direction of the arrow XX ′ in the figure. That is, since the portion of the test pattern 20 where the horizontal straight line is displayed is bright, and the portion where the horizontal straight line is not displayed is black, the screen position is moved until the optical sensor 16 detects the horizontal straight portion. When the position of the horizontal straight line portion is detected, this screen position data is stored in a predetermined storage means as an optimum screen position, and the screen position of the image projected from the set A is fixed.

Next, as shown in FIG. 2B, the test pattern 21 projected from the set B is displayed on the screen B12 without displaying anything on the screen A11. Thus, of the image light 14 from the set B, the image light 1 projected toward the screen A11 side
4 b is reflected by the reflecting mirror 15 and detected by the optical sensor 16. The light detection signal thus detected is set B
And adjusts the screen position of the screen B12 in the same manner as described above to fix the screen at the optimum screen position and store the screen position data.

After the screen position adjustment for each of the screens A11 and B12 is completed, the test patterns 20 and 21 are simultaneously displayed on both the screens A11 and B12 as shown in FIG. Are completely coincident with each other, and it is possible to reproduce and display a video which has no uncomfortable feeling at a single video connection displayed across the screens A11 and B12.

In FIG. 2, two sets A,
Although B and two screens A and B are described as being connected to each other on the left and right, another set and screen may be arranged on the upper and lower stages of the sets A and B and the screens A and B. In this case, the screen position is adjusted by arranging a common reflector and optical sensor on the line between the upper and lower screens adjacent to each other, detecting the image light reflected by the reflector with the optical sensor, and setting each upper and lower screen. It is sufficient to adjust the screen position of the image projected from the left and right directions. Thereby, the screen positions of the upper and lower screens can also be matched.

In adjusting the screen positions of the screen A11 and the screen B12, the optimum screen position detected by the optical sensor 16 needs to be the same condition.
Are the same plane, and the distance L1 from the plane of the screens A11 and B12 to the reflecting mirror 15 and the distance L2 from the reflecting mirror 15 to the optical sensor 16 are the same distance L1 = L
Let it be 2.

Next, the internal configuration of a projector having a screen position adjusting circuit will be described with reference to FIG.

FIG. 3 shows a multi-screen display device constructed by combining three sets A, B, and C. The description will be made mainly on the set A.

The set A has a switch circuit 31a, a signal processing unit 32a, a video display unit 33a, a projector 34a, a screen position adjusting circuit 35a, and a memory 36a.

The switch circuit 31a selects either a television signal or a test pattern signal,
The test pattern signal is supplied to the signal processing unit 32a, and is supplied from a separately provided controller 40. The output of the switch circuit 31a is supplied to a signal processing unit 32a, and after being subjected to processing such as image brightness and contrast adjustment, is supplied to the next-stage video display unit 33a.

The video display section 33a is composed of a CRT or a liquid crystal, and projects the video displayed on the video display section 33a from the projector 34a and displays it on a screen (not shown). The common light sensor 16a described above is provided between the sets A and B, and the light detection signal 17a from this sensor 16a is supplied to the screen position adjustment circuit 35.
a.

The screen position adjustment circuit 35a adjusts the display position of the screen when the test pattern is displayed. For example, the screen position adjustment circuit 35a controls the direct current component of the vertical deflection current to move the screen in the vertical direction, and adjusts the horizontal deflection current. The screen is moved in the left-right direction by controlling the DC component. Also, by controlling the amplitude of the vertical and horizontal deflection current,
The screen amplitude can be controlled, and these screen positions or screen amplitudes are made to be in an optimum state by using the light detection signal 17a. Also, the screen position adjustment circuit 35
A memory 36a is connected to a so that the adjusted position data (or amplitude data) is stored at the optimum position.

Similar circuits are provided for sets B and C. Circuits similar to set A are denoted by reference numerals b and c, and detailed description thereof is omitted.

A sensor 1b is provided between sets B and C.
Is provided. When adjusting the screen positions of the sets A and B, the light detection signal 17a from the sensor 16a is used.
When adjusting the screen positions of the sets B and C, the light detection signal 17b from the sensor 16b is used. For this reason, the set B is provided with a switch circuit 37b for selecting the light detection signals 17a and 17b and supplying the same to the position adjustment circuit 35b.

The controller 40 includes a character / graphic generation circuit 41 for generating a test pattern signal,
A selection circuit 42 and a microcomputer 43 are provided. The selection circuit 42 selects which set A, B, C the test pattern signal from the character / graphic signal generation circuit 41 is to be supplied to.
The switching of the C switch circuits 31a to 31c and 37b is performed by the microcomputer 43 in accordance with the screen position adjustment of each set.
Is to do.

The controller 40 may be provided independently of the sets A, B and C as shown, or may be provided in any one of the sets. Alternatively, a similar controller may be built in all sets.

As described above, according to the present invention, in the multi-screen display device, it is possible to automatically match the joints of the images displayed on each screen, and to adjust the screen position of each screen individually. Only by switching the test pattern to be supplied to the device, it can be performed automatically, and the screen position can be reliably adjusted in a short time by a person other than a skilled person.

The test pattern used for adjusting the screen position of the screen may be a cross pattern having a plurality of vertical and horizontal straight lines in addition to the above-mentioned cross pattern, or may use another still image having a reference image for adjusting the screen position. Is also possible.

Further, although the reflecting mirror and the optical sensor are provided at the center of the boundary between the screens, they may be provided at positions shifted from the center.

[0042]

According to the present invention, in a multi-screen display device, the position of a screen displayed on each screen can be adjusted without skill, and a high-quality image in which images at the joints of the screens match can be obtained. It has an effect that can be displayed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of an automatic screen position adjusting device for a multi-screen display device according to the present invention.

FIG. 2 is a front view for explaining the operation of the automatic screen position adjustment device of the present invention.

FIG. 3 is a block diagram showing an internal configuration of a projector provided with an automatic screen position adjustment circuit according to the present invention.

FIG. 4 is a front view for explaining a conventional problem.

[Explanation of symbols]

 11 ... Screen A 12 ... Screen B 13 ... Set A image light 14 ... Set B image light 15 ... Reflector 16 ... Optical sensor 17 ... Light detection signal 20, 21 ... Test pattern.

Claims (4)

[Claims] 1. A multi-screen display device in which a plurality of projection display means having a screen and a projector are arranged so as to be connected to each other, and an image projected from each projector is displayed on a corresponding screen. Adjacent to two
A reflecting mirror arranged to receive and reflect the image light projected from the two projectors, and an image light projected from the two projectors arranged to face the reflecting mirror and reflected by the reflecting mirror And a screen position for controlling a display position of an image projected from a projector adjacent to each other by using image light detected by the light detection unit. An automatic screen position adjusting device for a multi-screen display device, comprising: adjusting means; and storage means for storing position data of each of the projectors after adjusting the screen position. 2. One of the reflecting mirrors is arranged for a pair of adjacent first and second projection display means, and is directed from the projector of the first projection display means to the screen of the second projection display means. The image light projected and projected from the projector of the second projection means toward the screen of the first projection display means can be made incident on the reflecting mirror, respectively. 2. The automatic screen position adjusting device for a multi-screen display device according to 1. 3. The screen position adjusting means adjusts the screen position of one of the projection display means as a set of the first and second projection display means, and then adjusts the other projection in accordance with the screen position. 2. The automatic screen position adjusting device for a multi-screen display device according to claim 1, wherein the screen position of the display means is adjusted. 4. The screen position adjusting means displays a test pattern image by the one projection display means, and moves and adjusts a screen position so that the light detecting means detects the test pattern image light. 4. The same projection pattern image is displayed by the other projection display means, and the screen position is adjusted so as to detect the test pattern image light by the light detection means.
5. The automatic screen position adjusting device for a multi-screen display device according to claim 1.